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authorH. Peter Anvin <hpa@zytor.com>2009-09-10 11:47:49 -0700
committerH. Peter Anvin <hpa@zytor.com>2009-09-10 11:50:27 -0700
commit7ab6942e3012b43a958965cc94ceec8a20b438e9 (patch)
treec188bb4661c2f77940c3213b93664b988089b796
parentea9a67f259d41952a990fc2b6224a36f87cb579a (diff)
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core: import lwip TCP/IP stack
Import the lwip TCP/IP stack, with the intent to use it instead of raw PXE calls in PXELINUX. Lots of work to be done here, though. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
-rw-r--r--com32/include/errno.h29
-rw-r--r--core/Makefile19
-rw-r--r--core/lwip/CHANGELOG2248
-rw-r--r--core/lwip/COPYING33
-rw-r--r--core/lwip/FILES4
-rw-r--r--core/lwip/README89
-rw-r--r--core/lwip/doc/FILES6
-rw-r--r--core/lwip/doc/contrib.txt63
-rw-r--r--core/lwip/doc/rawapi.txt478
-rw-r--r--core/lwip/doc/savannah.txt135
-rw-r--r--core/lwip/doc/snmp_agent.txt181
-rw-r--r--core/lwip/doc/sys_arch.txt228
-rw-r--r--core/lwip/src/.hgignore26
-rw-r--r--core/lwip/src/FILES13
-rw-r--r--core/lwip/src/api/api_lib.c557
-rw-r--r--core/lwip/src/api/api_msg.c1232
-rw-r--r--core/lwip/src/api/err.c74
-rw-r--r--core/lwip/src/api/netbuf.c235
-rw-r--r--core/lwip/src/api/netdb.c356
-rw-r--r--core/lwip/src/api/netifapi.c126
-rw-r--r--core/lwip/src/api/sockets.c1970
-rw-r--r--core/lwip/src/api/tcpip.c596
-rw-r--r--core/lwip/src/arch/sys_arch.c79
-rw-r--r--core/lwip/src/core/dhcp.c1633
-rw-r--r--core/lwip/src/core/dns.c980
-rw-r--r--core/lwip/src/core/init.c269
-rw-r--r--core/lwip/src/core/ipv4/autoip.c453
-rw-r--r--core/lwip/src/core/ipv4/icmp.c331
-rw-r--r--core/lwip/src/core/ipv4/igmp.c757
-rw-r--r--core/lwip/src/core/ipv4/inet.c278
-rw-r--r--core/lwip/src/core/ipv4/inet_chksum.c438
-rw-r--r--core/lwip/src/core/ipv4/ip.c749
-rw-r--r--core/lwip/src/core/ipv4/ip_addr.c84
-rw-r--r--core/lwip/src/core/ipv4/ip_frag.c792
-rw-r--r--core/lwip/src/core/mem.c633
-rw-r--r--core/lwip/src/core/memp.c386
-rw-r--r--core/lwip/src/core/netif.c655
-rw-r--r--core/lwip/src/core/pbuf.c895
-rw-r--r--core/lwip/src/core/raw.c353
-rw-r--r--core/lwip/src/core/snmp/asn1_dec.c657
-rw-r--r--core/lwip/src/core/snmp/asn1_enc.c611
-rw-r--r--core/lwip/src/core/snmp/mib2.c4126
-rw-r--r--core/lwip/src/core/snmp/mib_structs.c1183
-rw-r--r--core/lwip/src/core/snmp/msg_in.c1454
-rw-r--r--core/lwip/src/core/snmp/msg_out.c683
-rw-r--r--core/lwip/src/core/stats.c149
-rw-r--r--core/lwip/src/core/sys.c344
-rw-r--r--core/lwip/src/core/tcp.c1458
-rw-r--r--core/lwip/src/core/tcp_in.c1419
-rw-r--r--core/lwip/src/core/tcp_out.c981
-rw-r--r--core/lwip/src/core/udp.c840
-rw-r--r--core/lwip/src/include/arch/cc.h36
-rw-r--r--core/lwip/src/include/arch/perf.h7
-rw-r--r--core/lwip/src/include/arch/sys_arch.h70
-rw-r--r--core/lwip/src/include/ipv4/lwip/autoip.h105
-rw-r--r--core/lwip/src/include/ipv4/lwip/icmp.h112
-rw-r--r--core/lwip/src/include/ipv4/lwip/igmp.h162
-rw-r--r--core/lwip/src/include/ipv4/lwip/inet.h103
-rw-r--r--core/lwip/src/include/ipv4/lwip/inet_chksum.h60
-rw-r--r--core/lwip/src/include/ipv4/lwip/ip.h187
-rw-r--r--core/lwip/src/include/ipv4/lwip/ip_addr.h168
-rw-r--r--core/lwip/src/include/ipv4/lwip/ip_frag.h76
-rw-r--r--core/lwip/src/include/lwip/api.h222
-rw-r--r--core/lwip/src/include/lwip/api_msg.h162
-rw-r--r--core/lwip/src/include/lwip/arch.h233
-rw-r--r--core/lwip/src/include/lwip/debug.h97
-rw-r--r--core/lwip/src/include/lwip/def.h47
-rw-r--r--core/lwip/src/include/lwip/dhcp.h246
-rw-r--r--core/lwip/src/include/lwip/dns.h97
-rw-r--r--core/lwip/src/include/lwip/err.h87
-rw-r--r--core/lwip/src/include/lwip/init.h72
-rw-r--r--core/lwip/src/include/lwip/mem.h107
-rw-r--r--core/lwip/src/include/lwip/memp.h116
-rw-r--r--core/lwip/src/include/lwip/memp_std.h102
-rw-r--r--core/lwip/src/include/lwip/netbuf.h77
-rw-r--r--core/lwip/src/include/lwip/netdb.h111
-rw-r--r--core/lwip/src/include/lwip/netif.h263
-rw-r--r--core/lwip/src/include/lwip/netifapi.h100
-rw-r--r--core/lwip/src/include/lwip/opt.h1820
-rw-r--r--core/lwip/src/include/lwip/pbuf.h120
-rw-r--r--core/lwip/src/include/lwip/raw.h97
-rw-r--r--core/lwip/src/include/lwip/sio.h81
-rw-r--r--core/lwip/src/include/lwip/snmp.h364
-rw-r--r--core/lwip/src/include/lwip/snmp_asn1.h101
-rw-r--r--core/lwip/src/include/lwip/snmp_msg.h311
-rw-r--r--core/lwip/src/include/lwip/snmp_structs.h262
-rw-r--r--core/lwip/src/include/lwip/sockets.h357
-rw-r--r--core/lwip/src/include/lwip/stats.h283
-rw-r--r--core/lwip/src/include/lwip/sys.h243
-rw-r--r--core/lwip/src/include/lwip/tcp.h699
-rw-r--r--core/lwip/src/include/lwip/tcpip.h141
-rw-r--r--core/lwip/src/include/lwip/udp.h150
-rw-r--r--core/lwip/src/include/lwipopts.h22
-rw-r--r--core/lwip/src/include/netif/etharp.h180
-rw-r--r--core/lwip/src/include/netif/loopif.h53
-rw-r--r--core/lwip/src/include/netif/ppp_oe.h161
-rw-r--r--core/lwip/src/include/netif/slipif.h50
-rw-r--r--core/lwip/src/netif/FILES25
-rw-r--r--core/lwip/src/netif/etharp.c1185
-rw-r--r--core/lwip/src/netif/ethernetif.c313
-rw-r--r--core/lwip/src/netif/loopif.c66
-rw-r--r--core/lwip/src/netif/ppp/auth.c988
-rw-r--r--core/lwip/src/netif/ppp/auth.h111
-rw-r--r--core/lwip/src/netif/ppp/chap.c902
-rw-r--r--core/lwip/src/netif/ppp/chap.h166
-rw-r--r--core/lwip/src/netif/ppp/chpms.c396
-rw-r--r--core/lwip/src/netif/ppp/chpms.h64
-rw-r--r--core/lwip/src/netif/ppp/fsm.c906
-rw-r--r--core/lwip/src/netif/ppp/fsm.h169
-rw-r--r--core/lwip/src/netif/ppp/ipcp.c1440
-rw-r--r--core/lwip/src/netif/ppp/ipcp.h124
-rw-r--r--core/lwip/src/netif/ppp/lcp.c2035
-rw-r--r--core/lwip/src/netif/ppp/lcp.h167
-rw-r--r--core/lwip/src/netif/ppp/magic.c82
-rw-r--r--core/lwip/src/netif/ppp/magic.h67
-rw-r--r--core/lwip/src/netif/ppp/md5.c318
-rw-r--r--core/lwip/src/netif/ppp/md5.h55
-rw-r--r--core/lwip/src/netif/ppp/pap.c619
-rw-r--r--core/lwip/src/netif/ppp/pap.h131
-rw-r--r--core/lwip/src/netif/ppp/ppp.c1999
-rw-r--r--core/lwip/src/netif/ppp/ppp.h465
-rw-r--r--core/lwip/src/netif/ppp/ppp_oe.c1227
-rw-r--r--core/lwip/src/netif/ppp/pppdebug.h86
-rw-r--r--core/lwip/src/netif/ppp/randm.c248
-rw-r--r--core/lwip/src/netif/ppp/randm.h81
-rw-r--r--core/lwip/src/netif/ppp/vj.c660
-rw-r--r--core/lwip/src/netif/ppp/vj.h155
-rw-r--r--core/lwip/src/netif/ppp/vjbsdhdr.h75
-rw-r--r--core/lwip/src/netif/slipif.c279
129 files changed, 56683 insertions, 9 deletions
diff --git a/com32/include/errno.h b/com32/include/errno.h
index 36690bf6..8ffaab99 100644
--- a/com32/include/errno.h
+++ b/com32/include/errno.h
@@ -127,8 +127,35 @@ extern int errno;
#define EISNAM 120 /* Is a named type file */
#define EREMOTEIO 121 /* Remote I/O error */
#define EDQUOT 122 /* Quota exceeded */
-
#define ENOMEDIUM 123 /* No medium found */
#define EMEDIUMTYPE 124 /* Wrong medium type */
+#define ECANCELED 125 /* Operation Canceled */
+#define ENOKEY 126 /* Required key not available */
+#define EKEYEXPIRED 127 /* Key has expired */
+#define EKEYREVOKED 128 /* Key has been revoked */
+#define EKEYREJECTED 129 /* Key was rejected by service */
+#define EOWNERDEAD 130 /* Owner died */
+#define ENOTRECOVERABLE 131 /* State not recoverable */
+
+/* lwIP nameserver query return codes */
+#define ENSROK 0 /* DNS server returned answer with no data */
+#define ENSRNODATA 160 /* DNS server returned answer with no data */
+#define ENSRFORMERR 161 /* DNS server claims query was misformatted */
+#define ENSRSERVFAIL 162 /* DNS server returned general failure */
+#define ENSRNOTFOUND 163 /* Domain name not found */
+#define ENSRNOTIMP 164 /* DNS server does not implement requested operation */
+#define ENSRREFUSED 165 /* DNS server refused query */
+#define ENSRBADQUERY 166 /* Misformatted DNS query */
+#define ENSRBADNAME 167 /* Misformatted domain name */
+#define ENSRBADFAMILY 168 /* Unsupported address family */
+#define ENSRBADRESP 169 /* Misformatted DNS reply */
+#define ENSRCONNREFUSED 170 /* Could not contact DNS servers */
+#define ENSRTIMEOUT 171 /* Timeout while contacting DNS servers */
+#define ENSROF 172 /* End of file */
+#define ENSRFILE 173 /* Error reading file */
+#define ENSRNOMEM 174 /* Out of memory */
+#define ENSRDESTRUCTION 175 /* Application terminated lookup */
+#define ENSRQUERYDOMAINTOOLONG 176 /* Domain name is too long */
+#define ENSRCNAMELOOP 177 /* Domain name is too long */
#endif /* _ERRNO_H */
diff --git a/core/Makefile b/core/Makefile
index b9963657..d2ca8c04 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -24,7 +24,8 @@ include $(topdir)/MCONFIG.embedded
-include $(topdir)/version.mk
OPTFLAGS =
-INCLUDES = -I./include -I$(com32)/include
+INCLUDES = -I./include -I$(com32)/include \
+ -I./lwip/src/include -I./lwip/src/include/ipv4
# This is very similar to cp437; technically it's for Norway and Denmark,
# but it's unlikely the characters that are different will be used in
@@ -40,9 +41,9 @@ BTARGET = kwdhash.gen \
# All primary source files for the main syslinux files
NASMSRC := $(wildcard *.asm)
NASMHDR := $(wildcard *.inc)
-CSRC := $(wildcard *.c */*.c */*/*.c)
-SSRC := $(wildcard *.S */*.S */*/*.S)
-CHDR := $(wildcard *.h */*.h */*/*.h)
+CSRC := $(shell find . -name '*.c' -print)
+SSRC := $(shell find . -name '*.S' -print)
+CHDR := $(shell find . -name '*.h' -print)
OTHERSRC := keywords
ALLSRC = $(NASMSRC) $(NASMHDR) $(CSRC) $(SSRC) $(CHDR) $(OTHERSRC)
@@ -134,10 +135,11 @@ install-all: install install-lib
netinstall: installer
tidy dist:
- rm -f codepage.cp *.o *.elf *.a stupid.* patch.offset .depend .*.d
+ find . -type f \( -name '*.o' -o -name '*.a' -o -name '.*.d' \
+ -o -name '*.lst' \) -print | xargs -rt rm -f
+ rm -f codepage.cp *.elf stupid.* patch.offset .depend
rm -f *.elf.tmp *.sym
- rm -f *.lsr *.lst *.map *.sec *.raw
- rm -f */*.o */*/*.o */*.lst */*/*.lst */.*.d */*/.*.d
+ rm -f *.lsr *.map *.sec *.raw
rm -f $(OBSOLETE)
clean: tidy
@@ -146,5 +148,6 @@ spotless: clean
rm -f $(BTARGET) *.bin *_bin.c
# Include dependencies file
--include .*.d */.*.d
+-include $(shell find . -name '.*.d' -print)
+
diff --git a/core/lwip/CHANGELOG b/core/lwip/CHANGELOG
new file mode 100644
index 00000000..a4576501
--- /dev/null
+++ b/core/lwip/CHANGELOG
@@ -0,0 +1,2248 @@
+FUTURE
+
+ * TODO: The lwIP source code makes some invalid assumptions on processor
+ word-length, storage sizes and alignment. See the mailing lists for
+ problems with exoteric (/DSP) architectures showing these problems.
+ We still have to fix some of these issues neatly.
+
+ * TODO: the PPP code is broken in a few ways. There are namespace
+ collisions on BSD systems and many assumptions on word-length
+ (sizeof(int)). In ppp.c an assumption is made on the availability of
+ a thread subsystem. Either PPP needs to be moved to contrib/ports/???
+ or rearranged to be more generic.
+
+HISTORY
+
+(CVS HEAD)
+
+ * [Enter new changes just after this line - do not remove this line]
+
+ ++ New features:
+
+ ++ Bugfixes:
+
+
+(STABLE-1.3.1)
+
+ ++ New features:
+
+ 2009-05-10 Simon Goldschmidt
+ * opt.h, sockets.c, pbuf.c, netbuf.h, pbuf.h: task #7013: Added option
+ LWIP_NETIF_TX_SINGLE_PBUF to try to create transmit packets from only
+ one pbuf to help MACs that don't support scatter-gather DMA.
+
+ 2009-05-09 Simon Goldschmidt
+ * icmp.h, icmp.c: Shrinked ICMP code, added option to NOT check icoming
+ ECHO pbuf for size (just use it): LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+
+ 2009-05-05 Simon Goldschmidt, Jakob Stoklund Olesen
+ * ip.h, ip.c: Added ip_current_netif() & ip_current_header() to receive
+ extended info about the currently received packet.
+
+ 2009-04-27 Simon Goldschmidt
+ * sys.h: Made SYS_LIGHTWEIGHT_PROT and sys_now() work with NO_SYS=1
+
+ 2009-04-25 Simon Goldschmidt
+ * mem.c, opt.h: Added option MEM_USE_POOLS_TRY_BIGGER_POOL to try the next
+ bigger malloc pool if one is empty (only usable with MEM_USE_POOLS).
+
+ 2009-04-21 Simon Goldschmidt
+ * dns.c, init.c, dns.h, opt.h: task #7507, patch #6786: DNS supports static
+ hosts table. New configuration options DNS_LOCAL_HOSTLIST and
+ DNS_LOCAL_HOSTLIST_IS_DYNAMIC. Also, DNS_LOOKUP_LOCAL_EXTERN() can be defined
+ as an external function for lookup.
+
+ 2009-04-15 Simon Goldschmidt
+ * dhcp.c: patch #6763: Global DHCP XID can be redefined to something more unique
+
+ 2009-03-31 Kieran Mansley
+ * tcp.c, tcp_out.c, tcp_in.c, sys.h, tcp.h, opts.h: add support for
+ TCP timestamp options, off by default. Rework tcp_enqueue() to
+ take option flags rather than specified option data
+
+ 2009-02-18 Simon Goldschmidt
+ * cc.h: Added printf formatter for size_t: SZT_F
+
+ 2009-02-16 Simon Goldschmidt (patch by Rishi Khan)
+ * icmp.c, opt.h: patch #6539: (configurable) response to broadcast- and multicast
+ pings
+
+ 2009-02-12 Simon Goldschmidt
+ * init.h: Added LWIP_VERSION to get the current version of the stack
+
+ 2009-02-11 Simon Goldschmidt (suggested by Gottfried Spitaler)
+ * opt.h, memp.h/.c: added MEMP_MEM_MALLOC to use mem_malloc/mem_free instead
+ of the pool allocator (can save code size with MEM_LIBC_MALLOC if libc-malloc
+ is otherwise used)
+
+ 2009-01-28 Jonathan Larmour (suggested by Bill Bauerbach)
+ * ipv4/inet_chksum.c, ipv4/lwip/inet_chksum.h: inet_chksum_pseudo_partial()
+ is only used by UDPLITE at present, so conditionalise it.
+
+ 2008-12-03 Simon Goldschmidt (base on patch from Luca Ceresoli)
+ * autoip.c: checked in (slightly modified) patch #6683: Customizable AUTOIP
+ "seed" address. This should reduce AUTOIP conflicts if
+ LWIP_AUTOIP_CREATE_SEED_ADDR is overridden.
+
+ 2008-10-02 Jonathan Larmour and Rishi Khan
+ * sockets.c (lwip_accept): Return EWOULDBLOCK if would block on non-blocking
+ socket.
+
+ 2008-06-30 Simon Goldschmidt
+ * mem.c, opt.h, stats.h: fixed bug #21433: Calling mem_free/pbuf_free from
+ interrupt context isn't safe: LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT allows
+ mem_free to run between mem_malloc iterations. Added illegal counter for
+ mem stats.
+
+ 2008-06-27 Simon Goldschmidt
+ * stats.h/.c, some other files: patch #6483: stats module improvement:
+ Added defines to display each module's statistic individually, added stats
+ defines for MEM, MEMP and SYS modules, removed (unused) rexmit counter.
+
+ 2008-06-17 Simon Goldschmidt
+ * err.h: patch #6459: Made err_t overridable to use a more efficient type
+ (define LWIP_ERR_T in cc.h)
+
+ 2008-06-17 Simon Goldschmidt
+ * slipif.c: patch #6480: Added a configuration option for slipif for symmetry
+ to loopif
+
+ 2008-06-17 Simon Goldschmidt (patch by Luca Ceresoli)
+ * netif.c, loopif.c, ip.c, netif.h, loopif.h, opt.h: Checked in slightly
+ modified version of patch # 6370: Moved loopif code to netif.c so that
+ loopback traffic is supported on all netifs (all local IPs).
+ Added option to limit loopback packets for each netifs.
+
+
+ ++ Bugfixes:
+ 2009-08-12 Kieran Mansley
+ * tcp_in.c, tcp.c: Fix bug #27209: handle trimming of segments when
+ out of window or out of order properly
+
+ 2009-08-12 Kieran Mansley
+ * tcp_in.c: Fix bug #27199: use snd_wl2 instead of snd_wl1
+
+ 2009-07-28 Simon Goldschmidt
+ * mem.h: Fixed bug #27105: "realloc() cannot replace mem_realloc()"s
+
+ 2009-07-27 Kieran Mansley
+ * api.h api_msg.h netdb.h sockets.h: add missing #include directives
+
+ 2009-07-09 Kieran Mansley
+ * api_msg.c, sockets.c, api.h: BUG23240 use signed counters for
+ recv_avail and don't increment counters until message successfully
+ sent to mbox
+
+ 2009-06-25 Kieran Mansley
+ * api_msg.c api.h: BUG26722: initialise netconn write variables
+ in netconn_alloc
+
+ 2009-06-25 Kieran Mansley
+ * tcp.h: BUG26879: set ret value in TCP_EVENT macros when function is not set
+
+ 2009-06-25 Kieran Mansley
+ * tcp.c, tcp_in.c, tcp_out.c, tcp.h: BUG26301 and BUG26267: correct
+ simultaneous close behaviour, and make snd_nxt have the same meaning
+ as in the RFCs.
+
+ 2009-05-12 Simon Goldschmidt
+ * etharp.h, etharp.c, netif.c: fixed bug #26507: "Gratuitous ARP depends on
+ arp_table / uses etharp_query" by adding etharp_gratuitous()
+
+ 2009-05-12 Simon Goldschmidt
+ * ip.h, ip.c, igmp.c: bug #26487: Added ip_output_if_opt that can add IP options
+ to the IP header (used by igmp_ip_output_if)
+
+ 2009-05-06 Simon Goldschmidt
+ * inet_chksum.c: On little endian architectures, use LWIP_PLATFORM_HTONS (if
+ defined) for SWAP_BYTES_IN_WORD to speed up checksumming.
+
+ 2009-05-05 Simon Goldschmidt
+ * sockets.c: bug #26405: Prematurely released semaphore causes lwip_select()
+ to crash
+
+ 2009-05-04 Simon Goldschmidt
+ * init.c: snmp was not initialized in lwip_init()
+
+ 2009-05-04 Frédéric Bernon
+ * dhcp.c, netbios.c: Changes if IP_SOF_BROADCAST is enabled.
+
+ 2009-05-03 Simon Goldschmidt
+ * tcp.h: bug #26349: Nagle algorithm doesn't send although segment is full
+ (and unsent->next == NULL)
+
+ 2009-05-02 Simon Goldschmidt
+ * tcpip.h, tcpip.c: fixed tcpip_untimeout (does not need the time, broken after
+ 1.3.0 in CVS only) - fixes compilation of ppp_oe.c
+
+ 2009-05-02 Simon Goldschmidt
+ * msg_in.c: fixed bug #25636: SNMPSET value is ignored for integer fields
+
+ 2009-05-01 Simon Goldschmidt
+ * pap.c: bug #21680: PPP upap_rauthnak() drops legal NAK packets
+
+ 2009-05-01 Simon Goldschmidt
+ * ppp.c: bug #24228: Memory corruption with PPP and DHCP
+
+ 2009-04-29 Frédéric Bernon
+ * raw.c, udp.c, init.c, opt.h, ip.h, sockets.h: bug #26309: Implement the
+ SO(F)_BROADCAST filter for all API layers. Avoid the unindented reception
+ of broadcast packets even when this option wasn't set. Port maintainers
+ which want to enable this filter have to set IP_SOF_BROADCAST=1 in opt.h.
+ If you want this option also filter broadcast on recv operations, you also
+ have to set IP_SOF_BROADCAST_RECV=1 in opt.h.
+
+ 2009-04-28 Simon Goldschmidt, Jakob Stoklund Olesen
+ * dhcp.c: patch #6721, bugs #25575, #25576: Some small fixes to DHCP and
+ DHCP/AUTOIP cooperation
+
+ 2009-04-25 Simon Goldschmidt, Oleg Tyshev
+ * tcp_out.c: bug #24212: Deadlocked tcp_retransmit due to exceeded pcb->cwnd
+ Fixed by sorting the unsent and unacked queues (segments are inserted at the
+ right place in tcp_output and tcp_rexmit).
+
+ 2009-04-25 Simon Goldschmidt
+ * memp.c, mem.c, memp.h, mem_std.h: bug #26213 "Problem with memory allocation
+ when debugging": memp_sizes contained the wrong sizes (including sanity
+ regions); memp pools for MEM_USE_POOLS were too small
+
+ 2009-04-24 Simon Goldschmidt, Frédéric Bernon
+ * inet.c: patch #6765: Fix a small problem with the last changes (incorrect
+ behavior, with with ip address string not ended by a '\0', a space or a
+ end of line)
+
+ 2009-04-19 Simon Goldschmidt
+ * rawapi.txt: Fixed bug #26069: Corrected documentation: if tcp_connect fails,
+ pcb->err is called, not pcb->connected (with an error code).
+
+ 2009-04-19 Simon Goldschmidt
+ * tcp_out.c: Fixed bug #26236: "TCP options (timestamp) don't work with
+ no-copy-tcpwrite": deallocate option data, only concat segments with same flags
+
+ 2009-04-19 Simon Goldschmidt
+ * tcp_out.c: Fixed bug #25094: "Zero-length pbuf" (options are now allocated
+ in the header pbuf, not the data pbuf)
+
+ 2009-04-18 Simon Goldschmidt
+ * api_msg.c: fixed bug #25695: Segmentation fault in do_writemore()
+
+ 2009-04-15 Simon Goldschmidt
+ * sockets.c: tried to fix bug #23559: lwip_recvfrom problem with tcp
+
+ 2009-04-15 Simon Goldschmidt
+ * dhcp.c: task #9192: mem_free of dhcp->options_in and dhcp->msg_in
+
+ 2009-04-15 Simon Goldschmidt
+ * ip.c, ip6.c, tcp_out.c, ip.h: patch #6808: Add a utility function
+ ip_hinted_output() (for smaller code mainly)
+
+ 2009-04-15 Simon Goldschmidt
+ * inet.c: patch #6765: Supporting new line characters in inet_aton()
+
+ 2009-04-15 Simon Goldschmidt
+ * dhcp.c: patch #6764: DHCP rebind and renew did not send hostnam option;
+ Converted constant OPTION_MAX_MSG_SIZE to netif->mtu, check if netif->mtu
+ is big enough in dhcp_start
+
+ 2009-04-15 Simon Goldschmidt
+ * netbuf.c: bug #26027: netbuf_chain resulted in pbuf memory leak
+
+ 2009-04-15 Simon Goldschmidt
+ * sockets.c, ppp.c: bug #25763: corrected 4 occurrences of SMEMCPY to MEMCPY
+
+ 2009-04-15 Simon Goldschmidt
+ * sockets.c: bug #26121: set_errno can be overridden
+
+ 2009-04-09 Kieran Mansley (patch from Luca Ceresoli <lucaceresoli>)
+ * init.c, opt.h: Patch#6774 TCP_QUEUE_OOSEQ breaks compilation when
+ LWIP_TCP==0
+
+ 2009-04-09 Kieran Mansley (patch from Roy Lee <roylee17>)
+ * tcp.h: Patch#6802 Add do-while-clauses to those function like
+ macros in tcp.h
+
+ 2009-03-31 Kieran Mansley
+ * tcp.c, tcp_in.c, tcp_out.c, tcp.h, opt.h: Rework the way window
+ updates are calculated and sent (BUG20515)
+
+ * tcp_in.c: cope with SYN packets received during established states,
+ and retransmission of initial SYN.
+
+ * tcp_out.c: set push bit correctly when tcp segments are merged
+
+ 2009-03-27 Kieran Mansley
+ * tcp_out.c set window correctly on probes (correcting change made
+ yesterday)
+
+ 2009-03-26 Kieran Mansley
+ * tcp.c, tcp_in.c, tcp.h: add tcp_abandon() to cope with dropping
+ connections where no reset required (bug #25622)
+
+ * tcp_out.c: set TCP_ACK flag on keepalive and zero window probes
+ (bug #20779)
+
+ 2009-02-18 Simon Goldschmidt (Jonathan Larmour and Bill Auerbach)
+ * ip_frag.c: patch #6528: the buffer used for IP_FRAG_USES_STATIC_BUF could be
+ too small depending on MEM_ALIGNMENT
+
+ 2009-02-16 Simon Goldschmidt
+ * sockets.h/.c, api_*.h/.c: fixed arguments of socket functions to match the standard;
+ converted size argument of netconn_write to 'size_t'
+
+ 2009-02-16 Simon Goldschmidt
+ * tcp.h, tcp.c: fixed bug #24440: TCP connection close problem on 64-bit host
+ by moving accept callback function pointer to TCP_PCB_COMMON
+
+ 2009-02-12 Simon Goldschmidt
+ * dhcp.c: fixed bug #25345 (DHCPDECLINE is sent with "Maximum message size"
+ option)
+
+ 2009-02-11 Simon Goldschmidt
+ * dhcp.c: fixed bug #24480 (releasing old udp_pdb and pbuf in dhcp_start)
+
+ 2009-02-11 Simon Goldschmidt
+ * opt.h, api_msg.c: added configurable default valud for netconn->recv_bufsize:
+ RECV_BUFSIZE_DEFAULT (fixes bug #23726: pbuf pool exhaustion on slow recv())
+
+ 2009-02-10 Simon Goldschmidt
+ * tcp.c: fixed bug #25467: Listen backlog is not reset on timeout in SYN_RCVD:
+ Accepts_pending is decrease on a corresponding listen pcb when a connection
+ in state SYN_RCVD is close.
+
+ 2009-01-28 Jonathan Larmour
+ * pbuf.c: reclaim pbufs from TCP out-of-sequence segments if we run
+ out of pool pbufs.
+
+ 2008-12-19 Simon Goldschmidt
+ * many files: patch #6699: fixed some warnings on platform where sizeof(int) == 2
+
+ 2008-12-10 Tamas Somogyi, Frédéric Bernon
+ * sockets.c: fixed bug #25051: lwip_recvfrom problem with udp: fromaddr and
+ port uses deleted netbuf.
+
+ 2008-10-18 Simon Goldschmidt
+ * tcp_in.c: fixed bug ##24596: Vulnerability on faulty TCP options length
+ in tcp_parseopt
+
+ 2008-10-15 Simon Goldschmidt
+ * ip_frag.c: fixed bug #24517: IP reassembly crashes on unaligned IP headers
+ by packing the struct ip_reass_helper.
+
+ 2008-10-03 David Woodhouse, Jonathan Larmour
+ * etharp.c (etharp_arp_input): Fix type aliasing problem copying ip address.
+
+ 2008-10-02 Jonathan Larmour
+ * dns.c: Hard-code structure sizes, to avoid issues on some compilers where
+ padding is included.
+
+ 2008-09-30 Jonathan Larmour
+ * sockets.c (lwip_accept): check addr isn't NULL. If it's valid, do an
+ assertion check that addrlen isn't NULL.
+
+ 2008-09-30 Jonathan Larmour
+ * tcp.c: Fix bug #24227, wrong error message in tcp_bind.
+
+ 2008-08-26 Simon Goldschmidt
+ * inet.h, ip_addr.h: fixed bug #24132: Cross-dependency between ip_addr.h and
+ inet.h -> moved declaration of struct in_addr from ip_addr.h to inet.h
+
+ 2008-08-14 Simon Goldschmidt
+ * api_msg.c: fixed bug #23847: do_close_internal references freed memory (when
+ tcp_close returns != ERR_OK)
+
+ 2008-07-08 Frédéric Bernon
+ * stats.h: Fix some build bugs introduced with patch #6483 (missing some parameters
+ in macros, mainly if MEM_STATS=0 and MEMP_STATS=0).
+
+ 2008-06-24 Jonathan Larmour
+ * tcp_in.c: Fix for bug #23693 as suggested by Art R. Ensure cseg is unused
+ if tcp_seg_copy fails.
+
+ 2008-06-17 Simon Goldschmidt
+ * inet_chksum.c: Checked in some ideas of patch #6460 (loop optimizations)
+ and created defines for swapping bytes and folding u32 to u16.
+
+ 2008-05-30 Kieran Mansley
+ * tcp_in.c Remove redundant "if" statement, and use real rcv_wnd
+ rather than rcv_ann_wnd when deciding if packets are in-window.
+ Contributed by <arasmussen@consultant.datasys.swri.edu>
+
+ 2008-05-30 Kieran Mansley
+ * mem.h: Fix BUG#23254. Change macro definition of mem_* to allow
+ passing as function pointers when MEM_LIBC_MALLOC is defined.
+
+ 2008-05-09 Jonathan Larmour
+ * err.h, err.c, sockets.c: Fix bug #23119: Reorder timeout error code to
+ stop it being treated as a fatal error.
+
+ 2008-04-15 Simon Goldschmidt
+ * dhcp.c: fixed bug #22804: dhcp_stop doesn't clear NETIF_FLAG_DHCP
+ (flag now cleared)
+
+ 2008-03-27 Simon Goldschmidt
+ * mem.c, tcpip.c, tcpip.h, opt.h: fixed bug #21433 (Calling mem_free/pbuf_free
+ from interrupt context isn't safe): set LWIP_USE_HEAP_FROM_INTERRUPT to 1
+ in lwipopts.h or use pbuf_free_callback(p)/mem_free_callback(m) to free pbufs
+ or heap memory from interrupt context
+
+ 2008-03-26 Simon Goldschmidt
+ * tcp_in.c, tcp.c: fixed bug #22249: division by zero could occur if a remote
+ host sent a zero mss as TCP option.
+
+
+(STABLE-1.3.0)
+
+ ++ New features:
+
+ 2008-03-10 Jonathan Larmour
+ * inet_chksum.c: Allow choice of one of the sample algorithms to be
+ made from lwipopts.h. Fix comment on how to override LWIP_CHKSUM.
+
+ 2008-01-22 Frédéric Bernon
+ * tcp.c, tcp_in.c, tcp.h, opt.h: Rename LWIP_CALCULATE_EFF_SEND_MSS in
+ TCP_CALCULATE_EFF_SEND_MSS to have coherent TCP options names.
+
+ 2008-01-14 Frédéric Bernon
+ * rawapi.txt, api_msg.c, tcp.c, tcp_in.c, tcp.h: changes for task #7675 "Enable
+ to refuse data on a TCP_EVENT_RECV call". Important, behavior changes for the
+ tcp_recv callback (see rawapi.txt).
+
+ 2008-01-14 Frédéric Bernon, Marc Chaland
+ * ip.c: Integrate patch #6369" ip_input : checking before realloc".
+
+ 2008-01-12 Frédéric Bernon
+ * tcpip.h, tcpip.c, api.h, api_lib.c, api_msg.c, sockets.c: replace the field
+ netconn::sem per netconn::op_completed like suggested for the task #7490
+ "Add return value to sys_mbox_post".
+
+ 2008-01-12 Frédéric Bernon
+ * api_msg.c, opt.h: replace DEFAULT_RECVMBOX_SIZE per DEFAULT_TCP_RECVMBOX_SIZE,
+ DEFAULT_UDP_RECVMBOX_SIZE and DEFAULT_RAW_RECVMBOX_SIZE (to optimize queues
+ sizes), like suggested for the task #7490 "Add return value to sys_mbox_post".
+
+ 2008-01-10 Frédéric Bernon
+ * tcpip.h, tcpip.c: add tcpip_callback_with_block function for the task #7490
+ "Add return value to sys_mbox_post". tcpip_callback is always defined as
+ "blocking" ("block" parameter = 1).
+
+ 2008-01-10 Frédéric Bernon
+ * tcpip.h, tcpip.c, api.h, api_lib.c, api_msg.c, sockets.c: replace the field
+ netconn::mbox (sys_mbox_t) per netconn::sem (sys_sem_t) for the task #7490
+ "Add return value to sys_mbox_post".
+
+ 2008-01-05 Frédéric Bernon
+ * sys_arch.txt, api.h, api_lib.c, api_msg.h, api_msg.c, tcpip.c, sys.h, opt.h:
+ Introduce changes for task #7490 "Add return value to sys_mbox_post" with some
+ modifications in the sys_mbox api: sys_mbox_new take a "size" parameters which
+ indicate the number of pointers query by the mailbox. There is three defines
+ in opt.h to indicate sizes for tcpip::mbox, netconn::recvmbox, and for the
+ netconn::acceptmbox. Port maintainers, you can decide to just add this new
+ parameter in your implementation, but to ignore it to keep the previous behavior.
+ The new sys_mbox_trypost function return a value to know if the mailbox is
+ full or if the message is posted. Take a look to sys_arch.txt for more details.
+ This new function is used in tcpip_input (so, can be called in an interrupt
+ context since the function is not blocking), and in recv_udp and recv_raw.
+
+ 2008-01-04 Frédéric Bernon, Simon Goldschmidt, Jonathan Larmour
+ * rawapi.txt, api.h, api_lib.c, api_msg.h, api_msg.c, sockets.c, tcp.h, tcp.c,
+ tcp_in.c, init.c, opt.h: rename backlog options with TCP_ prefix, limit the
+ "backlog" parameter in an u8_t, 0 is interpreted as "smallest queue", add
+ documentation in the rawapi.txt file.
+
+ 2007-12-31 Kieran Mansley (based on patch from Per-Henrik Lundbolm)
+ * tcp.c, tcp_in.c, tcp_out.c, tcp.h: Add TCP persist timer
+
+ 2007-12-31 Frédéric Bernon, Luca Ceresoli
+ * autoip.c, etharp.c: ip_addr.h: Integrate patch #6348: "Broadcast ARP packets
+ in autoip". The change in etharp_raw could be removed, since all calls to
+ etharp_raw use ethbroadcast for the "ethdst_addr" parameter. But it could be
+ wrong in the future.
+
+ 2007-12-30 Frédéric Bernon, Tom Evans
+ * ip.c: Fix bug #21846 "LwIP doesn't appear to perform any IP Source Address
+ Filtering" reported by Tom Evans.
+
+ 2007-12-21 Frédéric Bernon, Simon Goldschmidt, Jonathan Larmour
+ * tcp.h, opt.h, api.h, api_msg.h, tcp.c, tcp_in.c, api_lib.c, api_msg.c,
+ sockets.c, init.c: task #7252: Implement TCP listen backlog: Warning: raw API
+ applications have to call 'tcp_accepted(pcb)' in their accept callback to
+ keep accepting new connections.
+
+ 2007-12-13 Frédéric Bernon
+ * api_msg.c, err.h, err.c, sockets.c, dns.c, dns.h: replace "enum dns_result"
+ by err_t type. Add a new err_t code "ERR_INPROGRESS".
+
+ 2007-12-12 Frédéric Bernon
+ * dns.h, dns.c, opt.h: move DNS options to the "right" place. Most visibles
+ are the one which have ram usage.
+
+ 2007-12-05 Frédéric Bernon
+ * netdb.c: add a LWIP_DNS_API_HOSTENT_STORAGE option to decide to use a static
+ set of variables (=0) or a local one (=1). In this last case, your port should
+ provide a function "struct hostent* sys_thread_hostent( struct hostent* h)"
+ which have to do a copy of "h" and return a pointer ont the "per-thread" copy.
+
+ 2007-12-03 Simon Goldschmidt
+ * ip.c: ip_input: check if a packet is for inp first before checking all other
+ netifs on netif_list (speeds up packet receiving in most cases)
+
+ 2007-11-30 Simon Goldschmidt
+ * udp.c, raw.c: task #7497: Sort lists (pcb, netif, ...) for faster access
+ UDP: move a (connected) pcb selected for input to the front of the list of
+ pcbs so that it is found faster next time. Same for RAW pcbs that have eaten
+ a packet.
+
+ 2007-11-28 Simon Goldschmidt
+ * etharp.c, stats.c, stats.h, opt.h: Introduced ETHARP_STATS
+
+ 2007-11-25 Simon Goldschmidt
+ * dhcp.c: dhcp_unfold_reply() uses pbuf_copy_partial instead of its own copy
+ algorithm.
+
+ 2007-11-24 Simon Goldschmidt
+ * netdb.h, netdb.c, sockets.h/.c: Moved lwip_gethostbyname from sockets.c
+ to the new file netdb.c; included lwip_getaddrinfo.
+
+ 2007-11-21 Simon Goldschmidt
+ * tcp.h, opt.h, tcp.c, tcp_in.c: implemented calculating the effective send-mss
+ based on the MTU of the netif used to send. Enabled by default. Disable by
+ setting LWIP_CALCULATE_EFF_SEND_MSS to 0. This fixes bug #21492.
+
+ 2007-11-19 Frédéric Bernon
+ * api_msg.c, dns.h, dns.c: Implement DNS_DOES_NAME_CHECK option (check if name
+ received match the name query), implement DNS_USES_STATIC_BUF (the place where
+ copy dns payload to parse the response), return an error if there is no place
+ for a new query, and fix some minor problems.
+
+ 2007-11-16 Simon Goldschmidt
+ * new files: ipv4/inet.c, ipv4/inet_chksum.c, ipv6/inet6.c
+ removed files: core/inet.c, core/inet6.c
+ Moved inet files into ipv4/ipv6 directory; splitted inet.c/inet.h into
+ inet and chksum part; changed includes in all lwIP files as appropriate
+
+ 2007-11-16 Simon Goldschmidt
+ * api.h, api_msg.h, api_lib.c, api_msg.c, socket.h, socket.c: Added sequential
+ dns resolver function for netconn api (netconn_gethostbyname) and socket api
+ (gethostbyname/gethostbyname_r).
+
+ 2007-11-15 Jim Pettinato, Frédéric Bernon
+ * opt.h, init.c, tcpip.c, dhcp.c, dns.h, dns.c: add DNS client for simple name
+ requests with RAW api interface. Initialization is done in lwip_init() with
+ build time options. DNS timer is added in tcpip_thread context. DHCP can set
+ DNS server ip addresses when options are received. You need to set LWIP_DNS=1
+ in your lwipopts.h file (LWIP_DNS=0 in opt.h). DNS_DEBUG can be set to get
+ some traces with LWIP_DEBUGF. Sanity check have been added. There is a "todo"
+ list with points to improve.
+
+ 2007-11-06 Simon Goldschmidt
+ * opt.h, mib2.c: Patch #6215: added ifAdminStatus write support (if explicitly
+ enabled by defining SNMP_SAFE_REQUESTS to 0); added code to check link status
+ for ifOperStatus if LWIP_NETIF_LINK_CALLBACK is defined.
+
+ 2007-11-06 Simon Goldschmidt
+ * api.h, api_msg.h and dependent files: Task #7410: Removed the need to include
+ core header files in api.h (ip/tcp/udp/raw.h) to hide the internal
+ implementation from netconn api applications.
+
+ 2007-11-03 Frédéric Bernon
+ * api.h, api_lib.c, api_msg.c, sockets.c, opt.h: add SO_RCVBUF option for UDP &
+ RAW netconn. You need to set LWIP_SO_RCVBUF=1 in your lwipopts.h (it's disabled
+ by default). Netconn API users can use the netconn_recv_bufsize macro to access
+ it. This is a first release which have to be improve for TCP. Note it used the
+ netconn::recv_avail which need to be more "thread-safe" (note there is already
+ the problem for FIONREAD with lwip_ioctl/ioctlsocket).
+
+ 2007-11-01 Frédéric Bernon, Marc Chaland
+ * sockets.h, sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c, tcp.h, tcp_out.c:
+ Integrate "patch #6250 : MSG_MORE flag for send". MSG_MORE is used at socket api
+ layer, NETCONN_MORE at netconn api layer, and TCP_WRITE_FLAG_MORE at raw api
+ layer. This option enable to delayed TCP PUSH flag on multiple "write" calls.
+ Note that previous "copy" parameter for "write" APIs is now called "apiflags".
+
+ 2007-10-24 Frédéric Bernon
+ * api.h, api_lib.c, api_msg.c: Add macro API_EVENT in the same spirit than
+ TCP_EVENT_xxx macros to get a code more readable. It could also help to remove
+ some code (like we have talk in "patch #5919 : Create compile switch to remove
+ select code"), but it could be done later.
+
+ 2007-10-08 Simon Goldschmidt
+ * many files: Changed initialization: many init functions are not needed any
+ more since we now rely on the compiler initializing global and static
+ variables to zero!
+
+ 2007-10-06 Simon Goldschmidt
+ * ip_frag.c, memp.c, mib2.c, ip_frag.h, memp_std.h, opt.h: Changed IP_REASSEMBLY
+ to enqueue the received pbufs so that multiple packets can be reassembled
+ simultaneously and no static reassembly buffer is needed.
+
+ 2007-10-05 Simon Goldschmidt
+ * tcpip.c, etharp.h, etharp.c: moved ethernet_input from tcpip.c to etharp.c so
+ all netifs (or ports) can use it.
+
+ 2007-10-05 Frédéric Bernon
+ * netifapi.h, netifapi.c: add function netifapi_netif_set_default. Change the
+ common function to reduce a little bit the footprint (for all functions using
+ only the "netif" parameter).
+
+ 2007-10-03 Frédéric Bernon
+ * netifapi.h, netifapi.c: add functions netifapi_netif_set_up, netifapi_netif_set_down,
+ netifapi_autoip_start and netifapi_autoip_stop. Use a common function to reduce
+ a little bit the footprint (for all functions using only the "netif" parameter).
+
+ 2007-09-15 Frédéric Bernon
+ * udp.h, udp.c, sockets.c: Changes for "#20503 IGMP Improvement". Add IP_MULTICAST_IF
+ option in socket API, and a new field "multicast_ip" in "struct udp_pcb" (for
+ netconn and raw API users), only if LWIP_IGMP=1. Add getsockopt processing for
+ IP_MULTICAST_TTL and IP_MULTICAST_IF.
+
+ 2007-09-10 Frédéric Bernon
+ * snmp.h, mib2.c: enable to remove SNMP timer (which consumne several cycles
+ even when it's not necessary). snmp_agent.txt tell to call snmp_inc_sysuptime()
+ each 10ms (but, it's intrusive if you use sys_timeout feature). Now, you can
+ decide to call snmp_add_sysuptime(100) each 1000ms (which is bigger "step", but
+ call to a lower frequency). Or, you can decide to not call snmp_inc_sysuptime()
+ or snmp_add_sysuptime(), and to define the SNMP_GET_SYSUPTIME(sysuptime) macro.
+ This one is undefined by default in mib2.c. SNMP_GET_SYSUPTIME is called inside
+ snmp_get_sysuptime(u32_t *value), and enable to change "sysuptime" value only
+ when it's queried (any direct call to "sysuptime" is changed by a call to
+ snmp_get_sysuptime).
+
+ 2007-09-09 Frédéric Bernon, Bill Florac
+ * igmp.h, igmp.c, netif.h, netif.c, ip.c: To enable to have interfaces with IGMP,
+ and others without it, there is a new NETIF_FLAG_IGMP flag to set in netif->flags
+ if you want IGMP on an interface. igmp_stop() is now called inside netif_remove().
+ igmp_report_groups() is now called inside netif_set_link_up() (need to have
+ LWIP_NETIF_LINK_CALLBACK=1) to resend reports once the link is up (avoid to wait
+ the next query message to receive the matching multicast streams).
+
+ 2007-09-08 Frédéric Bernon
+ * sockets.c, ip.h, api.h, tcp.h: declare a "struct ip_pcb" which only contains
+ IP_PCB. Add in the netconn's "pcb" union a "struct ip_pcb *ip;" (no size change).
+ Use this new field to access to common pcb fields (ttl, tos, so_options, etc...).
+ Enable to access to these fields with LWIP_TCP=0.
+
+ 2007-09-05 Frédéric Bernon
+ * udp.c, ipv4/icmp.c, ipv4/ip.c, ipv6/icmp.c, ipv6/ip6.c, ipv4/icmp.h,
+ ipv6/icmp.h, opt.h: Integrate "task #7272 : LWIP_ICMP option". The new option
+ LWIP_ICMP enable/disable ICMP module inside the IP stack (enable per default).
+ Be careful, disabling ICMP make your product non-compliant to RFC1122, but
+ help to reduce footprint, and to reduce "visibility" on the Internet.
+
+ 2007-09-05 Frédéric Bernon, Bill Florac
+ * opt.h, sys.h, tcpip.c, slipif.c, ppp.c, sys_arch.txt: Change parameters list
+ for sys_thread_new (see "task #7252 : Create sys_thread_new_ex()"). Two new
+ parameters have to be provided: a task name, and a task stack size. For this
+ one, since it's platform dependant, you could define the best one for you in
+ your lwipopts.h. For port maintainers, you can just add these new parameters
+ in your sys_arch.c file, and but it's not mandatory, use them in your OS
+ specific functions.
+
+ 2007-09-05 Frédéric Bernon
+ * inet.c, autoip.c, msg_in.c, msg_out.c, init.c: Move some build time checkings
+ inside init.c for task #7142 "Sanity check user-configurable values".
+
+ 2007-09-04 Frédéric Bernon, Bill Florac
+ * igmp.h, igmp.c, memp_std.h, memp.c, init.c, opt.h: Replace mem_malloc call by
+ memp_malloc, and use a new MEMP_NUM_IGMP_GROUP option (see opt.h to define the
+ value). It will avoid potential fragmentation problems, use a counter to know
+ how many times a group is used on an netif, and free it when all applications
+ leave it. MEMP_NUM_IGMP_GROUP got 8 as default value (and init.c got a sanity
+ check if LWIP_IGMP!=0).
+
+ 2007-09-03 Frédéric Bernon
+ * igmp.h, igmp.c, sockets.c, api_msg.c: Changes for "#20503 IGMP Improvement".
+ Initialize igmp_mac_filter to NULL in netif_add (this field should be set in
+ the netif's "init" function). Use the "imr_interface" field (for socket layer)
+ and/or the "interface" field (for netconn layer), for join/leave operations.
+ The igmp_join/leavegroup first parameter change from a netif to an ipaddr.
+ This field could be a netif's ipaddr, or "any" (same meaning than ip_addr_isany).
+
+ 2007-08-30 Frédéric Bernon
+ * Add netbuf.h, netbuf.c, Change api.h, api_lib.c: #7249 "Split netbuf functions
+ from api/api_lib". Now netbuf API is independant of netconn, and can be used
+ with other API (application based on raw API, or future "socket2" API). Ports
+ maintainers just have to add src/api/netbuf.c in their makefile/projects.
+
+ 2007-08-30 Frédéric Bernon, Jonathan Larmour
+ * init.c: Add first version of lwip_sanity_check for task #7142 "Sanity check
+ user-configurable values".
+
+ 2007-08-29 Frédéric Bernon
+ * igmp.h, igmp.c, tcpip.c, init.c, netif.c: change igmp_init and add igmp_start.
+ igmp_start is call inside netif_add. Now, igmp initialization is in the same
+ spirit than the others modules. Modify some IGMP debug traces.
+
+ 2007-08-29 Frédéric Bernon
+ * Add init.h, init.c, Change opt.h, tcpip.c: Task #7213 "Add a lwip_init function"
+ Add lwip_init function to regroup all modules initializations, and to provide
+ a place to add code for task #7142 "Sanity check user-configurable values".
+ Ports maintainers should remove direct initializations calls from their code,
+ and add init.c in their makefiles. Note that lwip_init() function is called
+ inside tcpip_init, but can also be used by raw api users since all calls are
+ disabled when matching options are disabled. Also note that their is new options
+ in opt.h, you should configure in your lwipopts.h (they are enabled per default).
+
+ 2007-08-26 Marc Boucher
+ * api_msg.c: do_close_internal(): Reset the callbacks and arg (conn) to NULL
+ since they can under certain circumstances be called with an invalid conn
+ pointer after the connection has been closed (and conn has been freed).
+
+ 2007-08-25 Frédéric Bernon (Artem Migaev's Patch)
+ * netif.h, netif.c: Integrate "patch #6163 : Function to check if link layer is up".
+ Add a netif_is_link_up() function if LWIP_NETIF_LINK_CALLBACK option is set.
+
+ 2007-08-22 Frédéric Bernon
+ * netif.h, netif.c, opt.h: Rename LWIP_NETIF_CALLBACK in LWIP_NETIF_STATUS_CALLBACK
+ to be coherent with new LWIP_NETIF_LINK_CALLBACK option before next release.
+
+ 2007-08-22 Frédéric Bernon
+ * tcpip.h, tcpip.c, ethernetif.c, opt.h: remove options ETHARP_TCPIP_INPUT &
+ ETHARP_TCPIP_ETHINPUT, now, only "ethinput" code is supported, even if the
+ name is tcpip_input (we keep the name of 1.2.0 function).
+
+ 2007-08-17 Jared Grubb
+ * memp_std.h, memp.h, memp.c, mem.c, stats.c: (Task #7136) Centralize mempool
+ settings into new memp_std.h and optional user file lwippools.h. This adds
+ more dynamic mempools, and allows the user to create an arbitrary number of
+ mempools for mem_malloc.
+
+ 2007-08-16 Marc Boucher
+ * api_msg.c: Initialize newconn->state to NETCONN_NONE in accept_function;
+ otherwise it was left to NETCONN_CLOSE and sent_tcp() could prematurely
+ close the connection.
+
+ 2007-08-16 Marc Boucher
+ * sockets.c: lwip_accept(): check netconn_peer() error return.
+
+ 2007-08-16 Marc Boucher
+ * mem.c, mem.h: Added mem_calloc().
+
+ 2007-08-16 Marc Boucher
+ * tcpip.c, tcpip.h memp.c, memp.h: Added distinct memp (MEMP_TCPIP_MSG_INPKT)
+ for input packets to prevent floods from consuming all of MEMP_TCPIP_MSG
+ and starving other message types.
+ Renamed MEMP_TCPIP_MSG to MEMP_TCPIP_MSG_API
+
+ 2007-08-16 Marc Boucher
+ * pbuf.c, pbuf.h, etharp.c, tcp_in.c, sockets.c: Split pbuf flags in pbuf
+ type and flgs (later renamed to flags).
+ Use enum pbuf_flag as pbuf_type. Renumber PBUF_FLAG_*.
+ Improved lwip_recvfrom(). TCP push now propagated.
+
+ 2007-08-16 Marc Boucher
+ * ethernetif.c, contrib/ports/various: ethbroadcast now a shared global
+ provided by etharp.
+
+ 2007-08-16 Marc Boucher
+ * ppp_oe.c ppp_oe.h, auth.c chap.c fsm.c lcp.c ppp.c ppp.h,
+ etharp.c ethernetif.c, etharp.h, opt.h tcpip.h, tcpip.c:
+ Added PPPoE support and various PPP improvements.
+
+ 2007-07-25 Simon Goldschmidt
+ * api_lib.c, ip_frag.c, pbuf.c, api.h, pbuf.h: Introduced pbuf_copy_partial,
+ making netbuf_copy_partial use this function.
+
+ 2007-07-25 Simon Goldschmidt
+ * tcp_in.c: Fix bug #20506: Slow start / initial congestion window starts with
+ 2 * mss (instead of 1 * mss previously) to comply with some newer RFCs and
+ other stacks.
+
+ 2007-07-13 Jared Grubb (integrated by Frédéric Bernon)
+ * opt.h, netif.h, netif.c, ethernetif.c: Add new configuration option to add
+ a link callback in the netif struct, and functions to handle it. Be carefull
+ for port maintainers to add the NETIF_FLAG_LINK_UP flag (like in ethernetif.c)
+ if you want to be sure to be compatible with future changes...
+
+ 2007-06-30 Frédéric Bernon
+ * sockets.h, sockets.c: Implement MSG_PEEK flag for recv/recvfrom functions.
+
+ 2007-06-21 Simon Goldschmidt
+ * etharp.h, etharp.c: Combined etharp_request with etharp_raw for both
+ LWIP_AUTOIP =0 and =1 to remove redundant code.
+
+ 2007-06-21 Simon Goldschmidt
+ * mem.c, memp.c, mem.h, memp.h, opt.h: task #6863: Introduced the option
+ MEM_USE_POOLS to use 4 pools with different sized elements instead of a
+ heap. This both prevents memory fragmentation and gives a higher speed
+ at the cost of more memory consumption. Turned off by default.
+
+ 2007-06-21 Simon Goldschmidt
+ * api_lib.c, api_msg.c, api.h, api_msg.h: Converted the length argument of
+ netconn_write (and therefore also api_msg_msg.msg.w.len) from u16_t into
+ int to be able to send a bigger buffer than 64K with one time (mainly
+ used from lwip_send).
+
+ 2007-06-21 Simon Goldschmidt
+ * tcp.h, api_msg.c: Moved the nagle algorithm from netconn_write/do_write
+ into a define (tcp_output_nagle) in tcp.h to provide it to raw api users, too.
+
+ 2007-06-21 Simon Goldschmidt
+ * api.h, api_lib.c, api_msg.c: Fixed bug #20021: Moved sendbuf-processing in
+ netconn_write from api_lib.c to api_msg.c to also prevent multiple context-
+ changes on low memory or empty send-buffer.
+
+ 2007-06-18 Simon Goldschmidt
+ * etharp.c, etharp.h: Changed etharp to use a defined hardware address length
+ of 6 to avoid loading netif->hwaddr_len every time (since this file is only
+ used for ethernet and struct eth_addr already had a defined length of 6).
+
+ 2007-06-17 Simon Goldschmidt
+ * sockets.c, sockets.h: Implemented socket options SO_NO_CHECK for UDP sockets
+ to disable UDP checksum generation on transmit.
+
+ 2007-06-13 Frédéric Bernon, Simon Goldschmidt
+ * debug.h, api_msg.c: change LWIP_ERROR to use it to check errors like invalid
+ pointers or parameters, and let the possibility to redefined it in cc.h. Use
+ this macro to check "conn" parameter in api_msg.c functions.
+
+ 2007-06-11 Simon Goldschmidt
+ * sockets.c, sockets.h: Added UDP lite support for sockets
+
+ 2007-06-10 Simon Goldschmidt
+ * udp.h, opt.h, api_msg.c, ip.c, udp.c: Included switch LWIP_UDPLITE (enabled
+ by default) to switch off UDP-Lite support if not needed (reduces udp.c code
+ size)
+
+ 2007-06-09 Dominik Spies (integrated by Frédéric Bernon)
+ * autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h:
+ AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and
+ LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt
+ (see TODO mark in the source code).
+
+ 2007-06-09 Simon Goldschmidt
+ * etharp.h, etharp.c, ethernetif.c: Modified order of parameters for
+ etharp_output() to match netif->output so etharp_output() can be used
+ directly as netif->output to save one function call.
+
+ 2007-06-08 Simon Goldschmidt
+ * netif.h, ethernetif.c, slipif.c, loopif.c: Added define
+ NETIF_INIT_SNMP(netif, type, speed) to initialize per-netif snmp variables,
+ added initialization of those to ethernetif, slipif and loopif.
+
+ 2007-05-18 Simon Goldschmidt
+ * opt.h, ip_frag.c, ip_frag.h, ip.c: Added option IP_FRAG_USES_STATIC_BUF
+ (defaulting to off for now) that can be set to 0 to send fragmented
+ packets by passing PBUF_REFs down the stack.
+
+ 2007-05-23 Frédéric Bernon
+ * api_lib.c: Implement SO_RCVTIMEO for accept and recv on TCP
+ connections, such present in patch #5959.
+
+ 2007-05-23 Frédéric Bernon
+ * api.h, api_lib.c, api_msg.c, sockets.c: group the different NETCONN_UDPxxx
+ code in only one part...
+
+ 2007-05-18 Simon Goldschmidt
+ * opt.h, memp.h, memp.c: Added option MEMP_OVERFLOW_CHECK to check for memp
+ elements to overflow. This is achieved by adding some bytes before and after
+ each pool element (increasing their size, of course), filling them with a
+ prominent value and checking them on freeing the element.
+ Set it to 2 to also check every element in every pool each time memp_malloc()
+ or memp_free() is called (slower but more helpful).
+
+ 2007-05-10 Simon Goldschmidt
+ * opt.h, memp.h, memp.c, pbuf.c (see task #6831): use a new memp pool for
+ PBUF_POOL pbufs instead of the old pool implementation in pbuf.c to reduce
+ code size.
+
+ 2007-05-11 Frédéric Bernon
+ * sockets.c, api_lib.c, api_msg.h, api_msg.c, netifapi.h, netifapi.c, tcpip.c:
+ Include a function pointer instead of a table index in the message to reduce
+ footprint. Disable some part of lwip_send and lwip_sendto if some options are
+ not set (LWIP_TCP, LWIP_UDP, LWIP_RAW).
+
+ 2007-05-10 Simon Goldschmidt
+ * *.h (except netif/ppp/*.h): Included patch #5448: include '#ifdef __cplusplus
+ \ extern "C" {' in all header files. Now you can write your application using
+ the lwIP stack in C++ and simply #include the core files. Note I have left
+ out the netif/ppp/*h header files for now, since I don't know which files are
+ included by applications and which are for internal use only.
+
+ 2007-05-09 Simon Goldschmidt
+ * opt.h, *.c/*.h: Included patch #5920: Create define to override C-library
+ memcpy. 2 Defines are created: MEMCPY() for normal memcpy, SMEMCPY() for
+ situations where some compilers might inline the copy and save a function
+ call. Also replaced all calls to memcpy() with calls to (S)MEMCPY().
+
+ 2007-05-08 Simon Goldschmidt
+ * mem.h: If MEM_LIBC_MALLOC==1, allow the defines (e.g. mem_malloc() -> malloc())
+ to be overriden in case the C-library malloc implementation is not protected
+ against concurrent access.
+
+ 2007-05-04 Simon Goldschmidt (Atte Kojo)
+ * etharp.c: Introduced fast one-entry-cache to speed up ARP lookup when sending
+ multiple packets to the same host.
+
+ 2007-05-04 Frédéric Bernon, Jonathan Larmour
+ * sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fix bug #19162 "lwip_sento: a possible
+ to corrupt remote addr/port connection state". Reduce problems "not enought memory" with
+ netbuf (if we receive lot of datagrams). Improve lwip_sendto (only one exchange between
+ sockets api and api_msg which run in tcpip_thread context). Add netconn_sento function.
+ Warning, if you directly access to "fromaddr" & "fromport" field from netbuf struct,
+ these fields are now renamed "addr" & "port".
+
+ 2007-04-11 Jonathan Larmour
+ * sys.h, api_lib.c: Provide new sys_mbox_tryfetch function. Require ports to provide new
+ sys_arch_mbox_tryfetch function to get a message if one is there, otherwise return
+ with SYS_MBOX_EMPTY. sys_arch_mbox_tryfetch can be implemented as a function-like macro
+ by the port in sys_arch.h if desired.
+
+ 2007-04-06 Frédéric Bernon, Simon Goldschmidt
+ * opt.h, tcpip.h, tcpip.c, netifapi.h, netifapi.c: New configuration option LWIP_NETIF_API
+ allow to use thread-safe functions to add/remove netif in list, and to start/stop dhcp
+ clients, using new functions from netifapi.h. Disable as default (no port change to do).
+
+ 2007-04-05 Frédéric Bernon
+ * sockets.c: remplace ENOBUFS errors on alloc_socket by ENFILE to be more BSD compliant.
+
+ 2007-04-04 Simon Goldschmidt
+ * arch.h, api_msg.c, dhcp.c, msg_in.c, sockets.c: Introduced #define LWIP_UNUSED_ARG(x)
+ use this for and architecture-independent form to tell the compiler you intentionally
+ are not using this variable. Can be overriden in cc.h.
+
+ 2007-03-28 Frédéric Bernon
+ * opt.h, netif.h, dhcp.h, dhcp.c: New configuration option LWIP_NETIF_HOSTNAME allow to
+ define a hostname in netif struct (this is just a pointer, so, you can use a hardcoded
+ string, point on one of your's ethernetif field, or alloc a string you will free yourself).
+ It will be used by DHCP to register a client hostname, but can also be use when you call
+ snmp_set_sysname.
+
+ 2007-03-28 Frédéric Bernon
+ * netif.h, netif.c: A new NETIF_FLAG_ETHARP flag is defined in netif.h, to allow to
+ initialize a network interface's flag with. It tell this interface is an ethernet
+ device, and we can use ARP with it to do a "gratuitous ARP" (RFC 3220 "IP Mobility
+ Support for IPv4" section 4.6) when interface is "up" with netif_set_up().
+
+ 2007-03-26 Frédéric Bernon, Jonathan Larmour
+ * opt.h, tcpip.c: New configuration option LWIP_ARP allow to disable ARP init at build
+ time if you only use PPP or SLIP. The default is enable. Note we don't have to call
+ etharp_init in your port's initilization sequence if you use tcpip.c, because this call
+ is done in tcpip_init function.
+
+ 2007-03-22 Frédéric Bernon
+ * stats.h, stats.c, msg_in.c: Stats counters can be change to u32_t if necessary with the
+ new option LWIP_STATS_LARGE. If you need this option, define LWIP_STATS_LARGE to 1 in
+ your lwipopts.h. More, unused counters are not defined in the stats structs, and not
+ display by stats_display(). Note that some options (SYS_STATS and RAW_STATS) are defined
+ but never used. Fix msg_in.c with the correct #if test for a stat display.
+
+ 2007-03-21 Kieran Mansley
+ * netif.c, netif.h: Apply patch#4197 with some changes (originator: rireland@hmgsl.com).
+ Provides callback on netif up/down state change.
+
+ 2007-03-11 Frédéric Bernon, Mace Gael, Steve Reynolds
+ * sockets.h, sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c, igmp.h, igmp.c,
+ ip.c, netif.h, tcpip.c, opt.h:
+ New configuration option LWIP_IGMP to enable IGMP processing. Based on only one
+ filter per all network interfaces. Declare a new function in netif to enable to
+ control the MAC filter (to reduce lwIP traffic processing).
+
+ 2007-03-11 Frédéric Bernon
+ * tcp.h, tcp.c, sockets.c, tcp_out.c, tcp_in.c, opt.h: Keepalive values can
+ be configured at run time with LWIP_TCP_KEEPALIVE, but don't change this
+ unless you know what you're doing (default are RFC1122 compliant). Note
+ that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set in seconds.
+
+ 2007-03-08 Frédéric Bernon
+ * tcp.h: Keepalive values can be configured at compile time, but don't change
+ this unless you know what you're doing (default are RFC1122 compliant).
+
+ 2007-03-08 Frédéric Bernon
+ * sockets.c, api.h, api_lib.c, tcpip.c, sys.h, sys.c, err.c, opt.h:
+ Implement LWIP_SO_RCVTIMEO configuration option to enable/disable SO_RCVTIMEO
+ on UDP sockets/netconn.
+
+ 2007-03-08 Simon Goldschmidt
+ * snmp_msg.h, msg_in.c: SNMP UDP ports can be configured at compile time.
+
+ 2007-03-06 Frédéric Bernon
+ * api.h, api_lib.c, sockets.h, sockets.c, tcpip.c, sys.h, sys.c, err.h:
+ Implement SO_RCVTIMEO on UDP sockets/netconn.
+
+ 2007-02-28 Kieran Mansley (based on patch from Simon Goldschmidt)
+ * api_lib.c, tcpip.c, memp.c, memp.h: make API msg structs allocated
+ on the stack and remove the API msg type from memp
+
+ 2007-02-26 Jonathan Larmour (based on patch from Simon Goldschmidt)
+ * sockets.h, sockets.c: Move socket initialization to new
+ lwip_socket_init() function.
+ NOTE: this changes the API with ports. Ports will have to be
+ updated to call lwip_socket_init() now.
+
+ 2007-02-26 Jonathan Larmour (based on patch from Simon Goldschmidt)
+ * api_lib.c: Use memcpy in netbuf_copy_partial.
+
+
+ ++ Bug fixes:
+
+ 2008-03-17 Frédéric Bernon, Ed Kerekes
+ * igmp.h, igmp.c: Fix bug #22613 "IGMP iphdr problem" (could have
+ some problems to fill the IP header on some targets, use now the
+ ip.h macros to do it).
+
+ 2008-03-13 Frédéric Bernon
+ * sockets.c: Fix bug #22435 "lwip_recvfrom with TCP break;". Using
+ (lwip_)recvfrom with valid "from" and "fromlen" parameters, on a
+ TCP connection caused a crash. Note that using (lwip_)recvfrom
+ like this is a bit slow and that using (lwip)getpeername is the
+ good lwip way to do it (so, using recv is faster on tcp sockets).
+
+ 2008-03-12 Frédéric Bernon, Jonathan Larmour
+ * api_msg.c, contrib/apps/ping.c: Fix bug #22530 "api_msg.c's
+ recv_raw() does not consume data", and the ping sample (with
+ LWIP_SOCKET=1, the code did the wrong supposition that lwip_recvfrom
+ returned the IP payload, without the IP header).
+
+ 2008-03-04 Jonathan Larmour
+ * mem.c, stats.c, mem.h: apply patch #6414 to avoid compiler errors
+ and/or warnings on some systems where mem_size_t and size_t differ.
+ * pbuf.c, ppp.c: Fix warnings on some systems with mem_malloc.
+
+ 2008-03-04 Kieran Mansley (contributions by others)
+ * Numerous small compiler error/warning fixes from contributions to
+ mailing list after 1.3.0 release candidate made.
+
+ 2008-01-25 Cui hengbin (integrated by Frédéric Bernon)
+ * dns.c: Fix bug #22108 "DNS problem" caused by unaligned structures.
+
+ 2008-01-15 Kieran Mansley
+ * tcp_out.c: BUG20511. Modify persist timer to start when we are
+ prevented from sending by a small send window, not just a zero
+ send window.
+
+ 2008-01-09 Jonathan Larmour
+ * opt.h, ip.c: Rename IP_OPTIONS define to IP_OPTIONS_ALLOWED to avoid
+ conflict with Linux system headers.
+
+ 2008-01-06 Jonathan Larmour
+ * dhcp.c: fix bug #19927: "DHCP NACK problem" by clearing any existing set IP
+ address entirely on receiving a DHCPNAK, and restarting discovery.
+
+ 2007-12-21 Simon Goldschmidt
+ * sys.h, api_lib.c, api_msg.c, sockets.c: fix bug #21698: "netconn->recv_avail
+ is not protected" by using new macros for interlocked access to modify/test
+ netconn->recv_avail.
+
+ 2007-12-20 Kieran Mansley (based on patch from Oleg Tyshev)
+ * tcp_in.c: fix bug# 21535 (nrtx not reset correctly in SYN_SENT state)
+
+ 2007-12-20 Kieran Mansley (based on patch from Per-Henrik Lundbolm)
+ * tcp.c, tcp_in.c, tcp_out.c, tcp.h: fix bug #20199 (better handling
+ of silly window avoidance and prevent lwIP from shrinking the window)
+
+ 2007-12-04 Simon Goldschmidt
+ * tcp.c, tcp_in.c: fix bug #21699 (segment leak in ooseq processing when last
+ data packet was lost): add assert that all segment lists are empty in
+ tcp_pcb_remove before setting pcb to CLOSED state; don't directly set CLOSED
+ state from LAST_ACK in tcp_process
+
+ 2007-12-02 Simon Goldschmidt
+ * sockets.h: fix bug #21654: exclude definition of struct timeval from #ifndef FD_SET
+ If including <sys/time.h> for system-struct timeval, LWIP_TIMEVAL_PRIVATE now
+ has to be set to 0 in lwipopts.h
+
+ 2007-12-02 Simon Goldschmidt
+ * api_msg.c, api_lib.c: fix bug #21656 (recvmbox problem in netconn API): always
+ allocate a recvmbox in netconn_new_with_proto_and_callback. For a tcp-listen
+ netconn, this recvmbox is later freed and a new mbox is allocated for acceptmbox.
+ This is a fix for thread-safety and allocates all items needed for a netconn
+ when the netconn is created.
+
+ 2007-11-30 Simon Goldschmidt
+ * udp.c: first attempt to fix bug #21655 (DHCP doesn't work reliably with multiple
+ netifs): if LWIP_DHCP is enabled, UDP packets to DHCP_CLIENT_PORT are passed
+ to netif->dhcp->pcb only (if that exists) and not to any other pcb for the same
+ port (only solution to let UDP pcbs 'bind' to a netif instead of an IP address)
+
+ 2007-11-27 Simon Goldschmidt
+ * ip.c: fixed bug #21643 (udp_send/raw_send don't fail if netif is down) by
+ letting ip_route only use netifs that are up.
+
+ 2007-11-27 Simon Goldschmidt
+ * err.h, api_lib.c, api_msg.c, sockets.c: Changed error handling: ERR_MEM, ERR_BUF
+ and ERR_RTE are seen as non-fatal, all other errors are fatal. netconns and
+ sockets block most operations once they have seen a fatal error.
+
+ 2007-11-27 Simon Goldschmidt
+ * udp.h, udp.c, dhcp.c: Implemented new function udp_sendto_if which takes the
+ netif to send as an argument (to be able to send on netifs that are down).
+
+ 2007-11-26 Simon Goldschmidt
+ * tcp_in.c: Fixed bug #21582: pcb->acked accounting can be wrong when ACKs
+ arrive out-of-order
+
+ 2007-11-21 Simon Goldschmidt
+ * tcp.h, tcp_out.c, api_msg.c: Fixed bug #20287: tcp_output_nagle sends too early
+ Fixed the nagle algorithm; nagle now also works for all raw API applications
+ and has to be explicitly disabled with 'tcp_pcb->flags |= TF_NODELAY'
+
+ 2007-11-12 Frédéric Bernon
+ * sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fixed bug #20900. Now, most
+ of the netconn_peer and netconn_addr processing is done inside tcpip_thread
+ context in do_getaddr.
+
+ 2007-11-10 Simon Goldschmidt
+ * etharp.c: Fixed bug: assert fired when MEMP_ARP_QUEUE was empty (which can
+ happen any time). Now the packet simply isn't enqueued when out of memory.
+
+ 2007-11-01 Simon Goldschmidt
+ * tcp.c, tcp_in.c: Fixed bug #21494: The send mss (pcb->mss) is set to 536 (or
+ TCP_MSS if that is smaller) as long as no MSS option is received from the
+ remote host.
+
+ 2007-11-01 Simon Goldschmidt
+ * tcp.h, tcp.c, tcp_in.c: Fixed bug #21491: The MSS option sent (with SYN)
+ is now based on TCP_MSS instead of pcb->mss (on passive open now effectively
+ sending our configured TCP_MSS instead of the one received).
+
+ 2007-11-01 Simon Goldschmidt
+ * tcp_in.c: Fixed bug #21181: On active open, the initial congestion window was
+ calculated based on the configured TCP_MSS, not on the MSS option received
+ with SYN+ACK.
+
+ 2007-10-09 Simon Goldschmidt
+ * udp.c, inet.c, inet.h: Fixed UDPLite: send: Checksum was always generated too
+ short and also was generated wrong if checksum coverage != tot_len;
+ receive: checksum was calculated wrong if checksum coverage != tot_len
+
+ 2007-10-08 Simon Goldschmidt
+ * mem.c: lfree was not updated in mem_realloc!
+
+ 2007-10-07 Frédéric Bernon
+ * sockets.c, api.h, api_lib.c: First step to fix "bug #20900 : Potential
+ crash error problem with netconn_peer & netconn_addr". VERY IMPORTANT:
+ this change cause an API breakage for netconn_addr, since a parameter
+ type change. Any compiler should cause an error without any changes in
+ yours netconn_peer calls (so, it can't be a "silent change"). It also
+ reduce a little bit the footprint for socket layer (lwip_getpeername &
+ lwip_getsockname use now a common lwip_getaddrname function since
+ netconn_peer & netconn_addr have the same parameters).
+
+ 2007-09-20 Simon Goldschmidt
+ * tcp.c: Fixed bug #21080 (tcp_bind without check pcbs in TIME_WAIT state)
+ by checking tcp_tw_pcbs also
+
+ 2007-09-19 Simon Goldschmidt
+ * icmp.c: Fixed bug #21107 (didn't reset IP TTL in ICMP echo replies)
+
+ 2007-09-15 Mike Kleshov
+ * mem.c: Fixed bug #21077 (inaccuracy in calculation of lwip_stat.mem.used)
+
+ 2007-09-06 Frédéric Bernon
+ * several-files: replace some #include "arch/cc.h" by "lwip/arch.h", or simply remove
+ it as long as "lwip/opt.h" is included before (this one include "lwip/debug.h" which
+ already include "lwip/arch.h"). Like that, default defines are provided by "lwip/arch.h"
+ if they are not defined in cc.h, in the same spirit than "lwip/opt.h" for lwipopts.h.
+
+ 2007-08-30 Frédéric Bernon
+ * igmp.h, igmp.c: Some changes to remove some redundant code, add some traces,
+ and fix some coding style.
+
+ 2007-08-28 Frédéric Bernon
+ * tcpip.c: Fix TCPIP_MSG_INPKT processing: now, tcpip_input can be used for any
+ kind of packets. These packets are considered like Ethernet packets (payload
+ pointing to ethhdr) if the netif got the NETIF_FLAG_ETHARP flag. Else, packets
+ are considered like IP packets (payload pointing to iphdr).
+
+ 2007-08-27 Frédéric Bernon
+ * api.h, api_lib.c, api_msg.c: First fix for "bug #20900 : Potential crash error
+ problem with netconn_peer & netconn_addr". Introduce NETCONN_LISTEN netconn_state
+ and remove obsolete ones (NETCONN_RECV & NETCONN_ACCEPT).
+
+ 2007-08-24 Kieran Mansley
+ * inet.c Modify (acc >> 16) test to ((acc >> 16) != 0) to help buggy
+ compiler (Paradigm C++)
+
+ 2007-08-09 Frédéric Bernon, Bill Florac
+ * stats.h, stats.c, igmp.h, igmp.c, opt.h: Fix for bug #20503 : IGMP Improvement.
+ Introduce IGMP_STATS to centralize statistics management.
+
+ 2007-08-09 Frédéric Bernon, Bill Florac
+ * udp.c: Fix for bug #20503 : IGMP Improvement. Enable to receive a multicast
+ packet on a udp pcb binded on an netif's IP address, and not on "any".
+
+ 2007-08-09 Frédéric Bernon, Bill Florac
+ * igmp.h, igmp.c, ip.c: Fix minor changes from bug #20503 : IGMP Improvement.
+ This is mainly on using lookup/lookfor, and some coding styles...
+
+ 2007-07-26 Frédéric Bernon (and "thedoctor")
+ * igmp.c: Fix bug #20595 to accept IGMPv3 "Query" messages.
+
+ 2007-07-25 Simon Goldschmidt
+ * api_msg.c, tcp.c: Another fix for bug #20021: by not returning an error if
+ tcp_output fails in tcp_close, the code in do_close_internal gets simpler
+ (tcp_output is called again later from tcp timers).
+
+ 2007-07-25 Simon Goldschmidt
+ * ip_frag.c: Fixed bug #20429: use the new pbuf_copy_partial instead of the old
+ copy_from_pbuf, which illegally modified the given pbuf.
+
+ 2007-07-25 Simon Goldschmidt
+ * tcp_out.c: tcp_enqueue: pcb->snd_queuelen didn't work for chaine PBUF_RAMs:
+ changed snd_queuelen++ to snd_queuelen += pbuf_clen(p).
+
+ 2007-07-24 Simon Goldschmidt
+ * api_msg.c, tcp.c: Fix bug #20480: Check the pcb passed to tcp_listen() for the
+ correct state (must be CLOSED).
+
+ 2007-07-13 Thomas Taranowski (commited by Jared Grubb)
+ * memp.c: Fix bug #20478: memp_malloc returned NULL+MEMP_SIZE on failed
+ allocation. It now returns NULL.
+
+ 2007-07-13 Frédéric Bernon
+ * api_msg.c: Fix bug #20318: api_msg "recv" callbacks don't call pbuf_free in
+ all error cases.
+
+ 2007-07-13 Frédéric Bernon
+ * api_msg.c: Fix bug #20315: possible memory leak problem if tcp_listen failed,
+ because current code doesn't follow rawapi.txt documentation.
+
+ 2007-07-13 Kieran Mansley
+ * src/core/tcp_in.c Apply patch#5741 from Oleg Tyshev to fix bug in
+ out of sequence processing of received packets
+
+ 2007-07-03 Simon Goldschmidt
+ * nearly-all-files: Added assertions where PBUF_RAM pbufs are used and an
+ assumption is made that this pbuf is in one piece (i.e. not chained). These
+ assumptions clash with the possibility of converting to fully pool-based
+ pbuf implementations, where PBUF_RAM pbufs might be chained.
+
+ 2007-07-03 Simon Goldschmidt
+ * api.h, api_lib.c, api_msg.c: Final fix for bug #20021 and some other problems
+ when closing tcp netconns: removed conn->sem, less context switches when
+ closing, both netconn_close and netconn_delete should safely close tcp
+ connections.
+
+ 2007-07-02 Simon Goldschmidt
+ * ipv4/ip.h, ipv6/ip.h, opt.h, netif.h, etharp.h, ipv4/ip.c, netif.c, raw.c,
+ tcp_out.c, udp.c, etharp.c: Added option LWIP_NETIF_HWADDRHINT (default=off)
+ to cache ARP table indices with each pcb instead of single-entry cache for
+ the complete stack.
+
+ 2007-07-02 Simon Goldschmidt
+ * tcp.h, tcp.c, tcp_in.c, tcp_out.c: Added some ASSERTS and casts to prevent
+ warnings when assigning to smaller types.
+
+ 2007-06-28 Simon Goldschmidt
+ * tcp_out.c: Added check to prevent tcp_pcb->snd_queuelen from overflowing.
+
+ 2007-06-28 Simon Goldschmidt
+ * tcp.h: Fixed bug #20287: Fixed nagle algorithm (sending was done too early if
+ a segment contained chained pbufs)
+
+ 2007-06-28 Frédéric Bernon
+ * autoip.c: replace most of rand() calls by a macro LWIP_AUTOIP_RAND which compute
+ a "pseudo-random" value based on netif's MAC and some autoip fields. It's always
+ possible to define this macro in your own lwipopts.h to always use C library's
+ rand(). Note that autoip_create_rand_addr doesn't use this macro.
+
+ 2007-06-28 Frédéric Bernon
+ * netifapi.h, netifapi.c, tcpip.h, tcpip.c: Update code to handle the option
+ LWIP_TCPIP_CORE_LOCKING, and do some changes to be coherent with last modifications
+ in api_lib/api_msg (use pointers and not type with table, etc...)
+
+ 2007-06-26 Simon Goldschmidt
+ * udp.h: Fixed bug #20259: struct udp_hdr was lacking the packin defines.
+
+ 2007-06-25 Simon Goldschmidt
+ * udp.c: Fixed bug #20253: icmp_dest_unreach was called with a wrong p->payload
+ for udp packets with no matching pcb.
+
+ 2007-06-25 Simon Goldschmidt
+ * udp.c: Fixed bug #20220: UDP PCB search in udp_input(): a non-local match
+ could get udp input packets if the remote side matched.
+
+ 2007-06-13 Simon Goldschmidt
+ * netif.c: Fixed bug #20180 (TCP pcbs listening on IP_ADDR_ANY could get
+ changed in netif_set_ipaddr if previous netif->ip_addr.addr was 0.
+
+ 2007-06-13 Simon Goldschmidt
+ * api_msg.c: pcb_new sets conn->err if protocol is not implemented
+ -> netconn_new_..() does not allocate a new connection for unsupported
+ protocols.
+
+ 2007-06-13 Frédéric Bernon, Simon Goldschmidt
+ * api_lib.c: change return expression in netconn_addr and netconn_peer, because
+ conn->err was reset to ERR_OK without any reasons (and error was lost)...
+
+ 2007-06-13 Frédéric Bernon, Matthias Weisser
+ * opt.h, mem.h, mem.c, memp.c, pbuf.c, ip_frag.c, vj.c: Fix bug #20162. Rename
+ MEM_ALIGN in LWIP_MEM_ALIGN and MEM_ALIGN_SIZE in LWIP_MEM_ALIGN_SIZE to avoid
+ some macro names collision with some OS macros.
+
+ 2007-06-11 Simon Goldschmidt
+ * udp.c: UDP Lite: corrected the use of chksum_len (based on RFC3828: if it's 0,
+ create checksum over the complete packet. On RX, if it's < 8 (and not 0),
+ discard the packet. Also removed the duplicate 'udphdr->chksum = 0' for both
+ UDP & UDP Lite.
+
+ 2007-06-11 Srinivas Gollakota & Oleg Tyshev
+ * tcp_out.c: Fix for bug #20075 : "A problem with keep-alive timer and TCP flags"
+ where TCP flags wasn't initialized in tcp_keepalive.
+
+ 2007-06-03 Simon Goldschmidt
+ * udp.c: udp_input(): Input pbuf was not freed if pcb had no recv function
+ registered, p->payload was modified without modifying p->len if sending
+ icmp_dest_unreach() (had no negative effect but was definitively wrong).
+
+ 2007-06-03 Simon Goldschmidt
+ * icmp.c: Corrected bug #19937: For responding to an icmp echo request, icmp
+ re-used the input pbuf even if that didn't have enough space to include the
+ link headers. Now the space is tested and a new pbuf is allocated for the
+ echo response packet if the echo request pbuf isn't big enough.
+
+ 2007-06-01 Simon Goldschmidt
+ * sockets.c: Checked in patch #5914: Moved sockopt processing into tcpip_thread.
+
+ 2007-05-23 Frédéric Bernon
+ * api_lib.c, sockets.c: Fixed bug #5958 for netconn_listen (acceptmbox only
+ allocated by do_listen if success) and netconn_accept errors handling. In
+ most of api_lib functions, we replace some errors checkings like "if (conn==NULL)"
+ by ASSERT, except for netconn_delete.
+
+ 2007-05-23 Frédéric Bernon
+ * api_lib.c: Fixed bug #5957 "Safe-thread problem inside netconn_recv" to return
+ an error code if it's impossible to fetch a pbuf on a TCP connection (and not
+ directly close the recvmbox).
+
+ 2007-05-22 Simon Goldschmidt
+ * tcp.c: Fixed bug #1895 (tcp_bind not correct) by introducing a list of
+ bound but unconnected (and non-listening) tcp_pcbs.
+
+ 2007-05-22 Frédéric Bernon
+ * sys.h, sys.c, api_lib.c, tcpip.c: remove sys_mbox_fetch_timeout() (was only
+ used for LWIP_SO_RCVTIMEO option) and use sys_arch_mbox_fetch() instead of
+ sys_mbox_fetch() in api files. Now, users SHOULD NOT use internal lwIP features
+ like "sys_timeout" in their application threads.
+
+ 2007-05-22 Frédéric Bernon
+ * api.h, api_lib.c, api_msg.h, api_msg.c: change the struct api_msg_msg to see
+ which parameters are used by which do_xxx function, and to avoid "misusing"
+ parameters (patch #5938).
+
+ 2007-05-22 Simon Goldschmidt
+ * api_lib.c, api_msg.c, raw.c, api.h, api_msg.h, raw.h: Included patch #5938:
+ changed raw_pcb.protocol from u16_t to u8_t since for IPv4 and IPv6, proto
+ is only 8 bits wide. This affects the api, as there, the protocol was
+ u16_t, too.
+
+ 2007-05-18 Simon Goldschmidt
+ * memp.c: addition to patch #5913: smaller pointer was returned but
+ memp_memory was the same size -> did not save memory.
+
+ 2007-05-16 Simon Goldschmidt
+ * loopif.c, slipif.c: Fix bug #19729: free pbuf if netif->input() returns
+ != ERR_OK.
+
+ 2007-05-16 Simon Goldschmidt
+ * api_msg.c, udp.c: If a udp_pcb has a local_ip set, check if it is the same
+ as the one of the netif used for sending to prevent sending from old
+ addresses after a netif address gets changed (partly fixes bug #3168).
+
+ 2007-05-16 Frédéric Bernon
+ * tcpip.c, igmp.h, igmp.c: Fixed bug "#19800 : IGMP: igmp_tick() will not work
+ with NO_SYS=1". Note that igmp_init is always in tcpip_thread (and not in
+ tcpip_init) because we have to be sure that network interfaces are already
+ added (mac filter is updated only in igmp_init for the moment).
+
+ 2007-05-16 Simon Goldschmidt
+ * mem.c, memp.c: Removed semaphores from memp, changed sys_sem_wait calls
+ into sys_arch_sem_wait calls to prevent timers from running while waiting
+ for the heap. This fixes bug #19167.
+
+ 2007-05-13 Simon Goldschmidt
+ * tcp.h, sockets.h, sockets.c: Fixed bug from patch #5865 by moving the defines
+ for socket options (lwip_set/-getsockopt) used with level IPPROTO_TCP from
+ tcp.h to sockets.h.
+
+ 2007-05-07 Simon Goldschmidt
+ * mem.c: Another attempt to fix bug #17922.
+
+ 2007-05-04 Simon Goldschmidt
+ * pbuf.c, pbuf.h, etharp.c: Further update to ARP queueing: Changed pbuf_copy()
+ implementation so that it can be reused (don't allocate the target
+ pbuf inside pbuf_copy()).
+
+ 2007-05-04 Simon Goldschmidt
+ * memp.c: checked in patch #5913: in memp_malloc() we can return memp as mem
+ to save a little RAM (next pointer of memp is not used while not in pool).
+
+ 2007-05-03 "maq"
+ * sockets.c: Fix ioctl FIONREAD when some data remains from last recv.
+ (patch #3574).
+
+ 2007-04-23 Simon Goldschmidt
+ * loopif.c, loopif.h, opt.h, src/netif/FILES: fix bug #2595: "loopif results
+ in NULL reference for incoming TCP packets". Loopif has to be configured
+ (using LWIP_LOOPIF_MULTITHREADING) to directly call netif->input()
+ (multithreading environments, e.g. netif->input() = tcpip_input()) or
+ putting packets on a list that is fed to the stack by calling loopif_poll()
+ (single-thread / NO_SYS / polling environment where e.g.
+ netif->input() = ip_input).
+
+ 2007-04-17 Jonathan Larmour
+ * pbuf.c: Use s32_t in pbuf_realloc(), as an s16_t can't reliably hold
+ the difference between two u16_t's.
+ * sockets.h: FD_SETSIZE needs to match number of sockets, which is
+ MEMP_NUM_NETCONN in sockets.c right now.
+
+ 2007-04-12 Jonathan Larmour
+ * icmp.c: Reset IP header TTL in ICMP ECHO responses (bug #19580).
+
+ 2007-04-12 Kieran Mansley
+ * tcp.c, tcp_in.c, tcp_out.c, tcp.h: Modify way the retransmission
+ timer is reset to fix bug#19434, with help from Oleg Tyshev.
+
+ 2007-04-11 Simon Goldschmidt
+ * etharp.c, pbuf.c, pbuf.h: 3rd fix for bug #11400 (arp-queuing): More pbufs than
+ previously thought need to be copied (everything but PBUF_ROM!). Cleaned up
+ pbuf.c: removed functions no needed any more (by etharp).
+
+ 2007-04-11 Kieran Mansley
+ * inet.c, ip_addr.h, sockets.h, sys.h, tcp.h: Apply patch #5745: Fix
+ "Constant is long" warnings with 16bit compilers. Contributed by
+ avatar@mmlab.cse.yzu.edu.tw
+
+ 2007-04-05 Frédéric Bernon, Jonathan Larmour
+ * api_msg.c: Fix bug #16830: "err_tcp() posts to connection mailbox when no pend on
+ the mailbox is active". Now, the post is only done during a connect, and do_send,
+ do_write and do_join_leave_group don't do anything if a previous error was signaled.
+
+ 2007-04-03 Frédéric Bernon
+ * ip.c: Don't set the IP_DF ("Don't fragment") flag in the IP header in IP output
+ packets. See patch #5834.
+
+ 2007-03-30 Frédéric Bernon
+ * api_msg.c: add a "pcb_new" helper function to avoid redundant code, and to add
+ missing pcb allocations checking (in do_bind, and for each raw_new). Fix style.
+
+ 2007-03-30 Frédéric Bernon
+ * most of files: prefix all debug.h define with "LWIP_" to avoid any conflict with
+ others environment defines (these were too "generic").
+
+ 2007-03-28 Frédéric Bernon
+ * api.h, api_lib.c, sockets.c: netbuf_ref doesn't check its internal pbuf_alloc call
+ result and can cause a crash. lwip_send now check netbuf_ref result.
+
+ 2007-03-28 Simon Goldschmidt
+ * sockets.c Remove "#include <errno.h>" from sockets.c to avoid multiple
+ definition of macros (in errno.h and lwip/arch.h) if LWIP_PROVIDE_ERRNO is
+ defined. This is the way it should have been already (looking at
+ doc/sys_arch.txt)
+
+ 2007-03-28 Kieran Mansley
+ * opt.h Change default PBUF_POOL_BUFSIZE (again) to accomodate default MSS +
+ IP and TCP headers *and* physical link headers
+
+ 2007-03-26 Frédéric Bernon (based on patch from Dmitry Potapov)
+ * api_lib.c: patch for netconn_write(), fixes a possible race condition which cause
+ to send some garbage. It is not a definitive solution, but the patch does solve
+ the problem for most cases.
+
+ 2007-03-22 Frédéric Bernon
+ * api_msg.h, api_msg.c: Remove obsolete API_MSG_ACCEPT and do_accept (never used).
+
+ 2007-03-22 Frédéric Bernon
+ * api_lib.c: somes resources couldn't be freed if there was errors during
+ netconn_new_with_proto_and_callback.
+
+ 2007-03-22 Frédéric Bernon
+ * ethernetif.c: update netif->input calls to check return value. In older ports,
+ it's a good idea to upgrade them, even if before, there could be another problem
+ (access to an uninitialized mailbox).
+
+ 2007-03-21 Simon Goldschmidt
+ * sockets.c: fixed bug #5067 (essentialy a signed/unsigned warning fixed
+ by casting to unsigned).
+
+ 2007-03-21 Frédéric Bernon
+ * api_lib.c, api_msg.c, tcpip.c: integrate sys_mbox_fetch(conn->mbox, NULL) calls from
+ api_lib.c to tcpip.c's tcpip_apimsg(). Now, use a local variable and not a
+ dynamic one from memp to send tcpip_msg to tcpip_thread in a synchrone call.
+ Free tcpip_msg from tcpip_apimsg is not done in tcpip_thread. This give a
+ faster and more reliable communication between api_lib and tcpip.
+
+ 2007-03-21 Frédéric Bernon
+ * opt.h: Add LWIP_NETIF_CALLBACK (to avoid compiler warning) and set it to 0.
+
+ 2007-03-21 Frédéric Bernon
+ * api_msg.c, igmp.c, igmp.h: Fix C++ style comments
+
+ 2007-03-21 Kieran Mansley
+ * opt.h Change default PBUF_POOL_BUFSIZE to accomodate default MSS +
+ IP and TCP headers
+
+ 2007-03-21 Kieran Mansley
+ * Fix all uses of pbuf_header to check the return value. In some
+ cases just assert if it fails as I'm not sure how to fix them, but
+ this is no worse than before when they would carry on regardless
+ of the failure.
+
+ 2007-03-21 Kieran Mansley
+ * sockets.c, igmp.c, igmp.h, memp.h: Fix C++ style comments and
+ comment out missing header include in icmp.c
+
+ 2007-03-20 Frédéric Bernon
+ * memp.h, stats.c: Fix stats_display function where memp_names table wasn't
+ synchronized with memp.h.
+
+ 2007-03-20 Frédéric Bernon
+ * tcpip.c: Initialize tcpip's mbox, and verify if initialized in tcpip_input,
+ tcpip_ethinput, tcpip_callback, tcpip_apimsg, to fix a init problem with
+ network interfaces. Also fix a compiler warning.
+
+ 2007-03-20 Kieran Mansley
+ * udp.c: Only try and use pbuf_header() to make space for headers if
+ not a ROM or REF pbuf.
+
+ 2007-03-19 Frédéric Bernon
+ * api_msg.h, api_msg.c, tcpip.h, tcpip.c: Add return types to tcpip_apimsg()
+ and api_msg_post().
+
+ 2007-03-19 Frédéric Bernon
+ * Remove unimplemented "memp_realloc" function from memp.h.
+
+ 2007-03-11 Simon Goldschmidt
+ * pbuf.c: checked in patch #5796: pbuf_alloc: len field claculation caused
+ memory corruption.
+
+ 2007-03-11 Simon Goldschmidt (based on patch from Dmitry Potapov)
+ * api_lib.c, sockets.c, api.h, api_msg.h, sockets.h: Fixed bug #19251
+ (missing `const' qualifier in socket functions), to get more compatible to
+ standard POSIX sockets.
+
+ 2007-03-11 Frédéric Bernon (based on patch from Dmitry Potapov)
+ * sockets.c: Add asserts inside bind, connect and sendto to check input
+ parameters. Remove excessive set_errno() calls after get_socket(), because
+ errno is set inside of get_socket(). Move last sock_set_errno() inside
+ lwip_close.
+
+ 2007-03-09 Simon Goldschmidt
+ * memp.c: Fixed bug #11400: New etharp queueing introduced bug: memp_memory
+ was allocated too small.
+
+ 2007-03-06 Simon Goldschmidt
+ * tcpip.c: Initialize dhcp timers in tcpip_thread (if LWIP_DHCP) to protect
+ the stack from concurrent access.
+
+ 2007-03-06 Frédéric Bernon, Dmitry Potapov
+ * tcpip.c, ip_frag.c, ethernetif.c: Fix some build problems, and a redundancy
+ call to "lwip_stats.link.recv++;" in low_level_input() & ethernetif_input().
+
+ 2007-03-06 Simon Goldschmidt
+ * ip_frag.c, ip_frag.h: Reduce code size: don't include code in those files
+ if IP_FRAG == 0 and IP_REASSEMBLY == 0
+
+ 2007-03-06 Frédéric Bernon, Simon Goldschmidt
+ * opt.h, ip_frag.h, tcpip.h, tcpip.c, ethernetif.c: add new configuration
+ option named ETHARP_TCPIP_ETHINPUT, which enable the new tcpip_ethinput.
+ Allow to do ARP processing for incoming packets inside tcpip_thread
+ (protecting ARP layer against concurrent access). You can also disable
+ old code using tcp_input with new define ETHARP_TCPIP_INPUT set to 0.
+ Older ports have to use tcpip_ethinput.
+
+ 2007-03-06 Simon Goldschmidt (based on patch from Dmitry Potapov)
+ * err.h, err.c: fixed compiler warning "initialization dircards qualifiers
+ from pointer target type"
+
+ 2007-03-05 Frédéric Bernon
+ * opt.h, sockets.h: add new configuration options (LWIP_POSIX_SOCKETS_IO_NAMES,
+ ETHARP_TRUST_IP_MAC, review SO_REUSE)
+
+ 2007-03-04 Frédéric Bernon
+ * api_msg.c: Remove some compiler warnings : parameter "pcb" was never
+ referenced.
+
+ 2007-03-04 Frédéric Bernon
+ * api_lib.c: Fix "[patch #5764] api_lib.c cleanup: after patch #5687" (from
+ Dmitry Potapov).
+ The api_msg struct stay on the stack (not moved to netconn struct).
+
+ 2007-03-04 Simon Goldschmidt (based on patch from Dmitry Potapov)
+ * pbuf.c: Fix BUG#19168 - pbuf_free can cause deadlock (if
+ SYS_LIGHTWEIGHT_PROT=1 & freeing PBUF_RAM when mem_sem is not available)
+ Also fixed cast warning in pbuf_alloc()
+
+ 2007-03-04 Simon Goldschmidt
+ * etharp.c, etharp.h, memp.c, memp.h, opt.h: Fix BUG#11400 - don't corrupt
+ existing pbuf chain when enqueuing multiple pbufs to a pending ARP request
+
+ 2007-03-03 Frédéric Bernon
+ * udp.c: remove obsolete line "static struct udp_pcb *pcb_cache = NULL;"
+ It is static, and never used in udp.c except udp_init().
+
+ 2007-03-02 Simon Goldschmidt
+ * tcpip.c: Moved call to ip_init(), udp_init() and tcp_init() from
+ tcpip_thread() to tcpip_init(). This way, raw API connections can be
+ initialized before tcpip_thread is running (e.g. before OS is started)
+
+ 2007-03-02 Frédéric Bernon
+ * rawapi.txt: Fix documentation mismatch with etharp.h about etharp_tmr's call
+ interval.
+
+ 2007-02-28 Kieran Mansley
+ * pbuf.c: Fix BUG#17645 - ensure pbuf payload pointer is not moved
+ outside the region of the pbuf by pbuf_header()
+
+ 2007-02-28 Kieran Mansley
+ * sockets.c: Fix BUG#19161 - ensure milliseconds timeout is non-zero
+ when supplied timeout is also non-zero
+
+(STABLE-1.2.0)
+
+ 2006-12-05 Leon Woestenberg
+ * CHANGELOG: Mention STABLE-1.2.0 release.
+
+ ++ New features:
+
+ 2006-12-01 Christiaan Simons
+ * mem.h, opt.h: Added MEM_LIBC_MALLOC option.
+ Note this is a workaround. Currently I have no other options left.
+
+ 2006-10-26 Christiaan Simons (accepted patch by Jonathan Larmour)
+ * ipv4/ip_frag.c: rename MAX_MTU to IP_FRAG_MAX_MTU and move define
+ to include/lwip/opt.h.
+ * ipv4/lwip/ip_frag.h: Remove unused IP_REASS_INTERVAL.
+ Move IP_REASS_MAXAGE and IP_REASS_BUFSIZE to include/lwip/opt.h.
+ * opt.h: Add above new options.
+
+ 2006-08-18 Christiaan Simons
+ * tcp_{in,out}.c: added SNMP counters.
+ * ipv4/ip.c: added SNMP counters.
+ * ipv4/ip_frag.c: added SNMP counters.
+
+ 2006-08-08 Christiaan Simons
+ * etharp.{c,h}: added etharp_find_addr() to read
+ (stable) ethernet/IP address pair from ARP table
+
+ 2006-07-14 Christiaan Simons
+ * mib_structs.c: added
+ * include/lwip/snmp_structs.h: added
+ * netif.{c,h}, netif/ethernetif.c: added SNMP statistics to netif struct
+
+ 2006-07-06 Christiaan Simons
+ * snmp/asn1_{enc,dec}.c added
+ * snmp/mib2.c added
+ * snmp/msg_{in,out}.c added
+ * include/lwip/snmp_asn1.h added
+ * include/lwip/snmp_msg.h added
+ * doc/snmp_agent.txt added
+
+ 2006-03-29 Christiaan Simons
+ * inet.c, inet.h: Added platform byteswap support.
+ Added LWIP_PLATFORM_BYTESWAP define (defaults to 0) and
+ optional LWIP_PLATFORM_HTONS(), LWIP_PLATFORM_HTONL() macros.
+
+ ++ Bug fixes:
+
+ 2006-11-30 Christiaan Simons
+ * dhcp.c: Fixed false triggers of request_timeout.
+
+ 2006-11-28 Christiaan Simons
+ * netif.c: In netif_add() fixed missing clear of ip_addr, netmask, gw and flags.
+
+ 2006-10-11 Christiaan Simons
+ * api_lib.c etharp.c, ip.c, memp.c, stats.c, sys.{c,h} tcp.h:
+ Partially accepted patch #5449 for ANSI C compatibility / build fixes.
+ * ipv4/lwip/ip.h ipv6/lwip/ip.h: Corrected UDP-Lite protocol
+ identifier from 170 to 136 (bug #17574).
+
+ 2006-10-10 Christiaan Simons
+ * api_msg.c: Fixed Nagle algorithm as reported by Bob Grice.
+
+ 2006-08-17 Christiaan Simons
+ * udp.c: Fixed bug #17200, added check for broadcast
+ destinations for PCBs bound to a unicast address.
+
+ 2006-08-07 Christiaan Simons
+ * api_msg.c: Flushing TCP output in do_close() (bug #15926).
+
+ 2006-06-27 Christiaan Simons
+ * api_msg.c: Applied patch for cold case (bug #11135).
+ In accept_function() ensure newconn->callback is always initialized.
+
+ 2006-06-15 Christiaan Simons
+ * mem.h: added MEM_SIZE_F alias to fix an ancient cold case (bug #1748),
+ facilitate printing of mem_size_t and u16_t statistics.
+
+ 2006-06-14 Christiaan Simons
+ * api_msg.c: Applied patch #5146 to handle allocation failures
+ in accept() by Kevin Lawson.
+
+ 2006-05-26 Christiaan Simons
+ * api_lib.c: Removed conn->sem creation and destruction
+ from netconn_write() and added sys_sem_new to netconn_new_*.
+
+(STABLE-1_1_1)
+
+ 2006-03-03 Christiaan Simons
+ * ipv4/ip_frag.c: Added bound-checking assertions on ip_reassbitmap
+ access and added pbuf_alloc() return value checks.
+
+ 2006-01-01 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * tcp_{in,out}.c, tcp_out.c: Removed 'even sndbuf' fix in TCP, which is
+ now handled by the checksum routine properly.
+
+ 2006-02-27 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * pbuf.c: Fix alignment; pbuf_init() would not work unless
+ pbuf_pool_memory[] was properly aligned. (Patch by Curt McDowell.)
+
+ 2005-12-20 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * tcp.c: Remove PCBs which stay in LAST_ACK state too long. Patch
+ submitted by Mitrani Hiroshi.
+
+ 2005-12-15 Christiaan Simons
+ * inet.c: Disabled the added summing routine to preserve code space.
+
+ 2005-12-14 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * tcp_in.c: Duplicate FIN ACK race condition fix by Kelvin Lawson.
+ Added Curt McDowell's optimized checksumming routine for future
+ inclusion. Need to create test case for unaliged, aligned, odd,
+ even length combination of cases on various endianess machines.
+
+ 2005-12-09 Christiaan Simons
+ * inet.c: Rewrote standard checksum routine in proper portable C.
+
+ 2005-11-25 Christiaan Simons
+ * udp.c tcp.c: Removed SO_REUSE hack. Should reside in socket code only.
+ * *.c: introduced cc.h LWIP_DEBUG formatters matching the u16_t, s16_t,
+ u32_t, s32_t typedefs. This solves most debug word-length assumes.
+
+ 2005-07-17 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * inet.c: Fixed unaligned 16-bit access in the standard checksum
+ routine by Peter Jolasson.
+ * slipif.c: Fixed implementation assumption of single-pbuf datagrams.
+
+ 2005-02-04 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * tcp_out.c: Fixed uninitialized 'queue' referenced in memerr branch.
+ * tcp_{out|in}.c: Applied patch fixing unaligned access.
+
+ 2005-01-04 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * pbuf.c: Fixed missing semicolon after LWIP_DEBUG statement.
+
+ 2005-01-03 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * udp.c: UDP pcb->recv() was called even when it was NULL.
+
+(STABLE-1_1_0)
+
+ 2004-12-28 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * etharp.*: Disabled multiple packets on the ARP queue.
+ This clashes with TCP queueing.
+
+ 2004-11-28 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * etharp.*: Fixed race condition from ARP request to ARP timeout.
+ Halved the ARP period, doubled the period counts.
+ ETHARP_MAX_PENDING now should be at least 2. This prevents
+ the counter from reaching 0 right away (which would allow
+ too little time for ARP responses to be received).
+
+ 2004-11-25 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * dhcp.c: Decline messages were not multicast but unicast.
+ * etharp.c: ETHARP_CREATE is renamed to ETHARP_TRY_HARD.
+ Do not try hard to insert arbitrary packet's source address,
+ etharp_ip_input() now calls etharp_update() without ETHARP_TRY_HARD.
+ etharp_query() now always DOES call ETHARP_TRY_HARD so that users
+ querying an address will see it appear in the cache (DHCP could
+ suffer from this when a server invalidly gave an in-use address.)
+ * ipv4/ip_addr.h: Renamed ip_addr_maskcmp() to _netcmp() as we are
+ comparing network addresses (identifiers), not the network masks
+ themselves.
+ * ipv4/ip_addr.c: ip_addr_isbroadcast() now checks that the given
+ IP address actually belongs to the network of the given interface.
+
+ 2004-11-24 Kieran Mansley <kjm25@cam.ac.uk>
+ * tcp.c: Increment pcb->snd_buf when ACK is received in SYN_SENT state.
+
+(STABLE-1_1_0-RC1)
+
+ 2004-10-16 Kieran Mansley <kjm25@cam.ac.uk>
+ * tcp.c: Add code to tcp_recved() to send an ACK (window update) immediately,
+ even if one is already pending, if the rcv_wnd is above a threshold
+ (currently TCP_WND/2). This avoids waiting for a timer to expire to send a
+ delayed ACK in order to open the window if the stack is only receiving data.
+
+ 2004-09-12 Kieran Mansley <kjm25@cam.ac.uk>
+ * tcp*.*: Retransmit time-out handling improvement by Sam Jansen.
+
+ 2004-08-20 Tony Mountifield <tony@softins.co.uk>
+ * etharp.c: Make sure the first pbuf queued on an ARP entry
+ is properly ref counted.
+
+ 2004-07-27 Tony Mountifield <tony@softins.co.uk>
+ * debug.h: Added (int) cast in LWIP_DEBUGF() to avoid compiler
+ warnings about comparison.
+ * pbuf.c: Stopped compiler complaining of empty if statement
+ when LWIP_DEBUGF() empty. Closed an unclosed comment.
+ * tcp.c: Stopped compiler complaining of empty if statement
+ when LWIP_DEBUGF() empty.
+ * ip.h Corrected IPH_TOS() macro: returns a byte, so doesn't need htons().
+ * inet.c: Added a couple of casts to quiet the compiler.
+ No need to test isascii(c) before isdigit(c) or isxdigit(c).
+
+ 2004-07-22 Tony Mountifield <tony@softins.co.uk>
+ * inet.c: Made data types consistent in inet_ntoa().
+ Added casts for return values of checksum routines, to pacify compiler.
+ * ip_frag.c, tcp_out.c, sockets.c, pbuf.c
+ Small corrections to some debugging statements, to pacify compiler.
+
+ 2004-07-21 Tony Mountifield <tony@softins.co.uk>
+ * etharp.c: Removed spurious semicolon and added missing end-of-comment.
+ * ethernetif.c Updated low_level_output() to match prototype for
+ netif->linkoutput and changed low_level_input() similarly for consistency.
+ * api_msg.c: Changed recv_raw() from int to u8_t, to match prototype
+ of raw_recv() in raw.h and so avoid compiler error.
+ * sockets.c: Added trivial (int) cast to keep compiler happier.
+ * ip.c, netif.c Changed debug statements to use the tidier ip4_addrN() macros.
+
+(STABLE-1_0_0)
+
+ ++ Changes:
+
+ 2004-07-05 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * sockets.*: Restructured LWIP_PRIVATE_TIMEVAL. Make sure
+ your cc.h file defines this either 1 or 0. If non-defined,
+ defaults to 1.
+ * .c: Added <string.h> and <errno.h> includes where used.
+ * etharp.c: Made some array indices unsigned.
+
+ 2004-06-27 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * netif.*: Added netif_set_up()/down().
+ * dhcp.c: Changes to restart program flow.
+
+ 2004-05-07 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * etharp.c: In find_entry(), instead of a list traversal per candidate, do a
+ single-pass lookup for different candidates. Should exploit locality.
+
+ 2004-04-29 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * tcp*.c: Cleaned up source comment documentation for Doxygen processing.
+ * opt.h: ETHARP_ALWAYS_INSERT option removed to comply with ARP RFC.
+ * etharp.c: update_arp_entry() only adds new ARP entries when adviced to by
+ the caller. This deprecates the ETHARP_ALWAYS_INSERT overrule option.
+
+ ++ Bug fixes:
+
+ 2004-04-27 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * etharp.c: Applied patch of bug #8708 by Toni Mountifield with a solution
+ suggested by Timmy Brolin. Fix for 32-bit processors that cannot access
+ non-aligned 32-bit words, such as soms 32-bit TCP/IP header fields. Fix
+ is to prefix the 14-bit Ethernet headers with two padding bytes.
+
+ 2004-04-23 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * ip_addr.c: Fix in the ip_addr_isbroadcast() check.
+ * etharp.c: Fixed the case where the packet that initiates the ARP request
+ is not queued, and gets lost. Fixed the case where the packets destination
+ address is already known; we now always queue the packet and perform an ARP
+ request.
+
+(STABLE-0_7_0)
+
+ ++ Bug fixes:
+
+ * Fixed TCP bug for SYN_SENT to ESTABLISHED state transition.
+ * Fixed TCP bug in dequeueing of FIN from out of order segment queue.
+ * Fixed two possible NULL references in rare cases.
+
+(STABLE-0_6_6)
+
+ ++ Bug fixes:
+
+ * Fixed DHCP which did not include the IP address in DECLINE messages.
+
+ ++ Changes:
+
+ * etharp.c has been hauled over a bit.
+
+(STABLE-0_6_5)
+
+ ++ Bug fixes:
+
+ * Fixed TCP bug induced by bad window resizing with unidirectional TCP traffic.
+ * Packets sent from ARP queue had invalid source hardware address.
+
+ ++ Changes:
+
+ * Pass-by ARP requests do now update the cache.
+
+ ++ New features:
+
+ * No longer dependent on ctype.h.
+ * New socket options.
+ * Raw IP pcb support.
+
+(STABLE-0_6_4)
+
+ ++ Bug fixes:
+
+ * Some debug formatters and casts fixed.
+ * Numereous fixes in PPP.
+
+ ++ Changes:
+
+ * DEBUGF now is LWIP_DEBUGF
+ * pbuf_dechain() has been re-enabled.
+ * Mentioned the changed use of CVS branches in README.
+
+(STABLE-0_6_3)
+
+ ++ Bug fixes:
+
+ * Fixed pool pbuf memory leak in pbuf_alloc().
+ Occured if not enough PBUF_POOL pbufs for a packet pbuf chain.
+ Reported by Savin Zlobec.
+
+ * PBUF_POOL chains had their tot_len field not set for non-first
+ pbufs. Fixed in pbuf_alloc().
+
+ ++ New features:
+
+ * Added PPP stack contributed by Marc Boucher
+
+ ++ Changes:
+
+ * Now drops short packets for ICMP/UDP/TCP protocols. More robust.
+
+ * ARP queueuing now queues the latest packet instead of the first.
+ This is the RFC recommended behaviour, but can be overridden in
+ lwipopts.h.
+
+(0.6.2)
+
+ ++ Bugfixes:
+
+ * TCP has been fixed to deal with the new use of the pbuf->ref
+ counter.
+
+ * DHCP dhcp_inform() crash bug fixed.
+
+ ++ Changes:
+
+ * Removed pbuf_pool_free_cache and pbuf_pool_alloc_cache. Also removed
+ pbuf_refresh(). This has sped up pbuf pool operations considerably.
+ Implemented by David Haas.
+
+(0.6.1)
+
+ ++ New features:
+
+ * The packet buffer implementation has been enhanced to support
+ zero-copy and copy-on-demand for packet buffers which have their
+ payloads in application-managed memory.
+ Implemented by David Haas.
+
+ Use PBUF_REF to make a pbuf refer to RAM. lwIP will use zero-copy
+ if an outgoing packet can be directly sent on the link, or perform
+ a copy-on-demand when necessary.
+
+ The application can safely assume the packet is sent, and the RAM
+ is available to the application directly after calling udp_send()
+ or similar function.
+
+ ++ Bugfixes:
+
+ * ARP_QUEUEING should now correctly work for all cases, including
+ PBUF_REF.
+ Implemented by Leon Woestenberg.
+
+ ++ Changes:
+
+ * IP_ADDR_ANY is no longer a NULL pointer. Instead, it is a pointer
+ to a '0.0.0.0' IP address.
+
+ * The packet buffer implementation is changed. The pbuf->ref counter
+ meaning has changed, and several pbuf functions have been
+ adapted accordingly.
+
+ * netif drivers have to be changed to set the hardware address length field
+ that must be initialized correctly by the driver (hint: 6 for Ethernet MAC).
+ See the contrib/ports/c16x cs8900 driver as a driver example.
+
+ * netif's have a dhcp field that must be initialized to NULL by the driver.
+ See the contrib/ports/c16x cs8900 driver as a driver example.
+
+(0.5.x) This file has been unmaintained up to 0.6.1. All changes are
+ logged in CVS but have not been explained here.
+
+(0.5.3) Changes since version 0.5.2
+
+ ++ Bugfixes:
+
+ * memp_malloc(MEMP_API_MSG) could fail with multiple application
+ threads because it wasn't protected by semaphores.
+
+ ++ Other changes:
+
+ * struct ip_addr now packed.
+
+ * The name of the time variable in arp.c has been changed to ctime
+ to avoid conflicts with the time() function.
+
+(0.5.2) Changes since version 0.5.1
+
+ ++ New features:
+
+ * A new TCP function, tcp_tmr(), now handles both TCP timers.
+
+ ++ Bugfixes:
+
+ * A bug in tcp_parseopt() could cause the stack to hang because of a
+ malformed TCP option.
+
+ * The address of new connections in the accept() function in the BSD
+ socket library was not handled correctly.
+
+ * pbuf_dechain() did not update the ->tot_len field of the tail.
+
+ * Aborted TCP connections were not handled correctly in all
+ situations.
+
+ ++ Other changes:
+
+ * All protocol header structs are now packed.
+
+ * The ->len field in the tcp_seg structure now counts the actual
+ amount of data, and does not add one for SYN and FIN segments.
+
+(0.5.1) Changes since version 0.5.0
+
+ ++ New features:
+
+ * Possible to run as a user process under Linux.
+
+ * Preliminary support for cross platform packed structs.
+
+ * ARP timer now implemented.
+
+ ++ Bugfixes:
+
+ * TCP output queue length was badly initialized when opening
+ connections.
+
+ * TCP delayed ACKs were not sent correctly.
+
+ * Explicit initialization of BSS segment variables.
+
+ * read() in BSD socket library could drop data.
+
+ * Problems with memory alignment.
+
+ * Situations when all TCP buffers were used could lead to
+ starvation.
+
+ * TCP MSS option wasn't parsed correctly.
+
+ * Problems with UDP checksum calculation.
+
+ * IP multicast address tests had endianess problems.
+
+ * ARP requests had wrong destination hardware address.
+
+ ++ Other changes:
+
+ * struct eth_addr changed from u16_t[3] array to u8_t[6].
+
+ * A ->linkoutput() member was added to struct netif.
+
+ * TCP and UDP ->dest_* struct members where changed to ->remote_*.
+
+ * ntoh* macros are now null definitions for big endian CPUs.
+
+(0.5.0) Changes since version 0.4.2
+
+ ++ New features:
+
+ * Redesigned operating system emulation layer to make porting easier.
+
+ * Better control over TCP output buffers.
+
+ * Documenation added.
+
+ ++ Bugfixes:
+
+ * Locking issues in buffer management.
+
+ * Bugfixes in the sequential API.
+
+ * IP forwarding could cause memory leakage. This has been fixed.
+
+ ++ Other changes:
+
+ * Directory structure somewhat changed; the core/ tree has been
+ collapsed.
+
+(0.4.2) Changes since version 0.4.1
+
+ ++ New features:
+
+ * Experimental ARP implementation added.
+
+ * Skeleton Ethernet driver added.
+
+ * Experimental BSD socket API library added.
+
+ ++ Bugfixes:
+
+ * In very intense situations, memory leakage could occur. This has
+ been fixed.
+
+ ++ Other changes:
+
+ * Variables named "data" and "code" have been renamed in order to
+ avoid name conflicts in certain compilers.
+
+ * Variable++ have in appliciable cases been translated to ++variable
+ since some compilers generate better code in the latter case.
+
+(0.4.1) Changes since version 0.4
+
+ ++ New features:
+
+ * TCP: Connection attempts time out earlier than data
+ transmissions. Nagle algorithm implemented. Push flag set on the
+ last segment in a burst.
+
+ * UDP: experimental support for UDP-Lite extensions.
+
+ ++ Bugfixes:
+
+ * TCP: out of order segments were in some cases handled incorrectly,
+ and this has now been fixed. Delayed acknowledgements was broken
+ in 0.4, has now been fixed. Binding to an address that is in use
+ now results in an error. Reset connections sometimes hung an
+ application; this has been fixed.
+
+ * Checksum calculation sometimes failed for chained pbufs with odd
+ lengths. This has been fixed.
+
+ * API: a lot of bug fixes in the API. The UDP API has been improved
+ and tested. Error reporting and handling has been
+ improved. Logical flaws and race conditions for incoming TCP
+ connections has been found and removed.
+
+ * Memory manager: alignment issues. Reallocating memory sometimes
+ failed, this has been fixed.
+
+ * Generic library: bcopy was flawed and has been fixed.
+
+ ++ Other changes:
+
+ * API: all datatypes has been changed from generic ones such as
+ ints, to specified ones such as u16_t. Functions that return
+ errors now have the correct type (err_t).
+
+ * General: A lot of code cleaned up and debugging code removed. Many
+ portability issues have been fixed.
+
+ * The license was changed; the advertising clause was removed.
+
+ * C64 port added.
+
+ * Thanks: Huge thanks go to Dagan Galarneau, Horst Garnetzke, Petri
+ Kosunen, Mikael Caleres, and Frits Wilmink for reporting and
+ fixing bugs!
+
+(0.4) Changes since version 0.3.1
+
+ * Memory management has been radically changed; instead of
+ allocating memory from a shared heap, memory for objects that are
+ rapidly allocated and deallocated is now kept in pools. Allocation
+ and deallocation from those memory pools is very fast. The shared
+ heap is still present but is used less frequently.
+
+ * The memory, memory pool, and packet buffer subsystems now support
+ 4-, 2-, or 1-byte alignment.
+
+ * "Out of memory" situations are handled in a more robust way.
+
+ * Stack usage has been reduced.
+
+ * Easier configuration of lwIP parameters such as memory usage,
+ TTLs, statistics gathering, etc. All configuration parameters are
+ now kept in a single header file "lwipopts.h".
+
+ * The directory structure has been changed slightly so that all
+ architecture specific files are kept under the src/arch
+ hierarchy.
+
+ * Error propagation has been improved, both in the protocol modules
+ and in the API.
+
+ * The code for the RTXC architecture has been implemented, tested
+ and put to use.
+
+ * Bugs have been found and corrected in the TCP, UDP, IP, API, and
+ the Internet checksum modules.
+
+ * Bugs related to porting between a 32-bit and a 16-bit architecture
+ have been found and corrected.
+
+ * The license has been changed slightly to conform more with the
+ original BSD license, including the advertisement clause.
+
+(0.3.1) Changes since version 0.3
+
+ * Fix of a fatal bug in the buffer management. Pbufs with allocated
+ RAM never returned the RAM when the pbuf was deallocated.
+
+ * TCP congestion control, window updates and retransmissions did not
+ work correctly. This has now been fixed.
+
+ * Bugfixes in the API.
+
+(0.3) Changes since version 0.2
+
+ * New and improved directory structure. All include files are now
+ kept in a dedicated include/ directory.
+
+ * The API now has proper error handling. A new function,
+ netconn_err(), now returns an error code for the connection in
+ case of errors.
+
+ * Improvements in the memory management subsystem. The system now
+ keeps a pointer to the lowest free memory block. A new function,
+ mem_malloc2() tries to allocate memory once, and if it fails tries
+ to free some memory and retry the allocation.
+
+ * Much testing has been done with limited memory
+ configurations. lwIP now does a better job when overloaded.
+
+ * Some bugfixes and improvements to the buffer (pbuf) subsystem.
+
+ * Many bugfixes in the TCP code:
+
+ - Fixed a bug in tcp_close().
+
+ - The TCP receive window was incorrectly closed when out of
+ sequence segments was received. This has been fixed.
+
+ - Connections are now timed-out of the FIN-WAIT-2 state.
+
+ - The initial congestion window could in some cases be too
+ large. This has been fixed.
+
+ - The retransmission queue could in some cases be screwed up. This
+ has been fixed.
+
+ - TCP RST flag now handled correctly.
+
+ - Out of sequence data was in some cases never delivered to the
+ application. This has been fixed.
+
+ - Retransmitted segments now contain the correct acknowledgment
+ number and advertised window.
+
+ - TCP retransmission timeout backoffs are not correctly computed
+ (ala BSD). After a number of retransmissions, TCP now gives up
+ the connection.
+
+ * TCP connections now are kept on three lists, one for active
+ connections, one for listening connections, and one for
+ connections that are in TIME-WAIT. This greatly speeds up the fast
+ timeout processing for sending delayed ACKs.
+
+ * TCP now provides proper feedback to the application when a
+ connection has been successfully set up.
+
+ * More comments have been added to the code. The code has also been
+ somewhat cleaned up.
+
+(0.2) Initial public release.
diff --git a/core/lwip/COPYING b/core/lwip/COPYING
new file mode 100644
index 00000000..e23898b5
--- /dev/null
+++ b/core/lwip/COPYING
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2001, 2002 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+
diff --git a/core/lwip/FILES b/core/lwip/FILES
new file mode 100644
index 00000000..66253196
--- /dev/null
+++ b/core/lwip/FILES
@@ -0,0 +1,4 @@
+src/ - The source code for the lwIP TCP/IP stack.
+doc/ - The documentation for lwIP.
+
+See also the FILES file in each subdirectory.
diff --git a/core/lwip/README b/core/lwip/README
new file mode 100644
index 00000000..8dda4b46
--- /dev/null
+++ b/core/lwip/README
@@ -0,0 +1,89 @@
+INTRODUCTION
+
+lwIP is a small independent implementation of the TCP/IP protocol
+suite that has been developed by Adam Dunkels at the Computer and
+Networks Architectures (CNA) lab at the Swedish Institute of Computer
+Science (SICS).
+
+The focus of the lwIP TCP/IP implementation is to reduce the RAM usage
+while still having a full scale TCP. This making lwIP suitable for use
+in embedded systems with tens of kilobytes of free RAM and room for
+around 40 kilobytes of code ROM.
+
+FEATURES
+
+ * IP (Internet Protocol) including packet forwarding over multiple network
+ interfaces
+ * ICMP (Internet Control Message Protocol) for network maintenance and debugging
+ * IGMP (Internet Group Management Protocol) for multicast traffic management
+ * UDP (User Datagram Protocol) including experimental UDP-lite extensions
+ * TCP (Transmission Control Protocol) with congestion control, RTT estimation
+ and fast recovery/fast retransmit
+ * Specialized raw/native API for enhanced performance
+ * Optional Berkeley-like socket API
+ * DNS (Domain names resolver)
+ * SNMP (Simple Network Management Protocol)
+ * DHCP (Dynamic Host Configuration Protocol)
+ * AUTOIP (for IPv4, conform with RFC 3927)
+ * PPP (Point-to-Point Protocol)
+ * ARP (Address Resolution Protocol) for Ethernet
+
+LICENSE
+
+lwIP is freely available under a BSD license.
+
+DEVELOPMENT
+
+lwIP has grown into an excellent TCP/IP stack for embedded devices,
+and developers using the stack often submit bug fixes, improvements,
+and additions to the stack to further increase its usefulness.
+
+Development of lwIP is hosted on Savannah, a central point for
+software development, maintenance and distribution. Everyone can
+help improve lwIP by use of Savannah's interface, CVS and the
+mailing list. A core team of developers will commit changes to the
+CVS source tree.
+
+The lwIP TCP/IP stack is maintained in the 'lwip' CVS module and
+contributions (such as platform ports) are in the 'contrib' module.
+
+See doc/savannah.txt for details on CVS server access for users and
+developers.
+
+Last night's CVS tar ball can be downloaded from:
+ http://savannah.gnu.org/cvs.backups/lwip.tar.gz [CHANGED - NEEDS FIXING]
+
+The current CVS trees are web-browsable:
+ http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/lwip/
+ http://savannah.nongnu.org/cgi-bin/viewcvs/lwip/contrib/
+
+Submit patches and bugs via the lwIP project page:
+ http://savannah.nongnu.org/projects/lwip/
+
+
+DOCUMENTATION
+
+The original out-dated homepage of lwIP and Adam Dunkels' papers on
+lwIP are at the official lwIP home page:
+ http://www.sics.se/~adam/lwip/
+
+Self documentation of the source code is regularly extracted from the
+current CVS sources and is available from this web page:
+ http://www.nongnu.org/lwip/
+
+There is now a constantly growin wiki about lwIP at
+ http://lwip.scribblewiki.com/
+
+Also, there are mailing lists you can subscribe at
+ http://savannah.nongnu.org/mail/?group=lwip
+plus searchable archives:
+ http://lists.nongnu.org/archive/html/lwip-users/
+ http://lists.nongnu.org/archive/html/lwip-devel/
+
+Reading Adam's papers, the files in docs/, browsing the source code
+documentation and browsing the mailing list archives is a good way to
+become familiar with the design of lwIP.
+
+Adam Dunkels <adam@sics.se>
+Leon Woestenberg <leon.woestenberg@gmx.net>
+
diff --git a/core/lwip/doc/FILES b/core/lwip/doc/FILES
new file mode 100644
index 00000000..05d356f4
--- /dev/null
+++ b/core/lwip/doc/FILES
@@ -0,0 +1,6 @@
+savannah.txt - How to obtain the current development source code.
+contrib.txt - How to contribute to lwIP as a developer.
+rawapi.txt - The documentation for the core API of lwIP.
+ Also provides an overview about the other APIs and multithreading.
+snmp_agent.txt - The documentation for the lwIP SNMP agent.
+sys_arch.txt - The documentation for a system abstraction layer of lwIP.
diff --git a/core/lwip/doc/contrib.txt b/core/lwip/doc/contrib.txt
new file mode 100644
index 00000000..39596fca
--- /dev/null
+++ b/core/lwip/doc/contrib.txt
@@ -0,0 +1,63 @@
+1 Introduction
+
+This document describes some guidelines for people participating
+in lwIP development.
+
+2 How to contribute to lwIP
+
+Here is a short list of suggestions to anybody working with lwIP and
+trying to contribute bug reports, fixes, enhancements, platform ports etc.
+First of all as you may already know lwIP is a volunteer project so feedback
+to fixes or questions might often come late. Hopefully the bug and patch tracking
+features of Savannah help us not lose users' input.
+
+2.1 Source code style:
+
+1. do not use tabs.
+2. indentation is two spaces per level (i.e. per tab).
+3. end debug messages with a trailing newline (\n).
+4. one space between keyword and opening bracket.
+5. no space between function and opening bracket.
+6. one space and no newline before opening curly braces of a block.
+7. closing curly brace on a single line.
+8. spaces surrounding assignment and comparisons.
+9. don't initialize static and/or global variables to zero, the compiler takes care of that.
+10. use current source code style as further reference.
+
+2.2 Source code documentation style:
+
+1. JavaDoc compliant and Doxygen compatible.
+2. Function documentation above functions in .c files, not .h files.
+ (This forces you to synchronize documentation and implementation.)
+3. Use current documentation style as further reference.
+
+2.3 Bug reports and patches:
+
+1. Make sure you are reporting bugs or send patches against the latest
+ sources. (From the latest release and/or the current CVS sources.)
+2. If you think you found a bug make sure it's not already filed in the
+ bugtracker at Savannah.
+3. If you have a fix put the patch on Savannah. If it is a patch that affects
+ both core and arch specific stuff please separate them so that the core can
+ be applied separately while leaving the other patch 'open'. The prefered way
+ is to NOT touch archs you can't test and let maintainers take care of them.
+ This is a good way to see if they are used at all - the same goes for unix
+ netifs except tapif.
+4. Do not file a bug and post a fix to it to the patch area. Either a bug report
+ or a patch will be enough.
+ If you correct an existing bug then attach the patch to the bug rather than creating a new entry in the patch area.
+5. Trivial patches (compiler warning, indentation and spelling fixes or anything obvious which takes a line or two)
+ can go to the lwip-users list. This is still the fastest way of interaction and the list is not so crowded
+ as to allow for loss of fixes. Putting bugs on Savannah and subsequently closing them is too much an overhead
+ for reporting a compiler warning fix.
+6. Patches should be specific to a single change or to related changes.Do not mix bugfixes with spelling and other
+ trivial fixes unless the bugfix is trivial too.Do not reorganize code and rename identifiers in the same patch you
+ change behaviour if not necessary.A patch is easier to read and understand if it's to the point and short than
+ if it's not to the point and long :) so the chances for it to be applied are greater.
+
+2.4 Platform porters:
+
+1. If you have ported lwIP to a platform (an OS, a uC/processor or a combination of these) and
+ you think it could benefit others[1] you might want discuss this on the mailing list. You
+ can also ask for CVS access to submit and maintain your port in the contrib CVS module.
+ \ No newline at end of file
diff --git a/core/lwip/doc/rawapi.txt b/core/lwip/doc/rawapi.txt
new file mode 100644
index 00000000..8eec6e78
--- /dev/null
+++ b/core/lwip/doc/rawapi.txt
@@ -0,0 +1,478 @@
+Raw TCP/IP interface for lwIP
+
+Authors: Adam Dunkels, Leon Woestenberg, Christiaan Simons
+
+lwIP provides three Application Program's Interfaces (APIs) for programs
+to use for communication with the TCP/IP code:
+* low-level "core" / "callback" or "raw" API.
+* higher-level "sequential" API.
+* BSD-style socket API.
+
+The sequential API provides a way for ordinary, sequential, programs
+to use the lwIP stack. It is quite similar to the BSD socket API. The
+model of execution is based on the blocking open-read-write-close
+paradigm. Since the TCP/IP stack is event based by nature, the TCP/IP
+code and the application program must reside in different execution
+contexts (threads).
+
+The socket API is a compatibility API for existing applications,
+currently it is built on top of the sequential API. It is meant to
+provide all functions needed to run socket API applications running
+on other platforms (e.g. unix / windows etc.). However, due to limitations
+in the specification of this API, there might be incompatibilities
+that require small modifications of existing programs.
+
+** Threading
+
+lwIP started targeting single-threaded environments. When adding multi-
+threading support, instead of making the core thread-safe, another
+approach was chosen: there is one main thread running the lwIP core
+(also known as the "tcpip_thread"). The raw API may only be used from
+this thread! Application threads using the sequential- or socket API
+communicate with this main thread through message passing.
+
+ As such, the list of functions that may be called from
+ other threads or an ISR is very limited! Only functions
+ from these API header files are thread-safe:
+ - api.h
+ - netbuf.h
+ - netdb.h
+ - netifapi.h
+ - sockets.h
+ - sys.h
+
+ Additionaly, memory (de-)allocation functions may be
+ called from multiple threads (not ISR!) with NO_SYS=0
+ since they are protected by SYS_LIGHTWEIGHT_PROT and/or
+ semaphores.
+
+ Only since 1.3.0, if SYS_LIGHTWEIGHT_PROT is set to 1
+ and LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT is set to 1,
+ pbuf_free() may also be called from another thread or
+ an ISR (since only then, mem_free - for PBUF_RAM - may
+ be called from an ISR: otherwise, the HEAP is only
+ protected by semaphores).
+
+
+** The remainder of this document discusses the "raw" API. **
+
+The raw TCP/IP interface allows the application program to integrate
+better with the TCP/IP code. Program execution is event based by
+having callback functions being called from within the TCP/IP
+code. The TCP/IP code and the application program both run in the same
+thread. The sequential API has a much higher overhead and is not very
+well suited for small systems since it forces a multithreaded paradigm
+on the application.
+
+The raw TCP/IP interface is not only faster in terms of code execution
+time but is also less memory intensive. The drawback is that program
+development is somewhat harder and application programs written for
+the raw TCP/IP interface are more difficult to understand. Still, this
+is the preferred way of writing applications that should be small in
+code size and memory usage.
+
+Both APIs can be used simultaneously by different application
+programs. In fact, the sequential API is implemented as an application
+program using the raw TCP/IP interface.
+
+--- Callbacks
+
+Program execution is driven by callbacks. Each callback is an ordinary
+C function that is called from within the TCP/IP code. Every callback
+function is passed the current TCP or UDP connection state as an
+argument. Also, in order to be able to keep program specific state,
+the callback functions are called with a program specified argument
+that is independent of the TCP/IP state.
+
+The function for setting the application connection state is:
+
+- void tcp_arg(struct tcp_pcb *pcb, void *arg)
+
+ Specifies the program specific state that should be passed to all
+ other callback functions. The "pcb" argument is the current TCP
+ connection control block, and the "arg" argument is the argument
+ that will be passed to the callbacks.
+
+
+--- TCP connection setup
+
+The functions used for setting up connections is similar to that of
+the sequential API and of the BSD socket API. A new TCP connection
+identifier (i.e., a protocol control block - PCB) is created with the
+tcp_new() function. This PCB can then be either set to listen for new
+incoming connections or be explicitly connected to another host.
+
+- struct tcp_pcb *tcp_new(void)
+
+ Creates a new connection identifier (PCB). If memory is not
+ available for creating the new pcb, NULL is returned.
+
+- err_t tcp_bind(struct tcp_pcb *pcb, struct ip_addr *ipaddr,
+ u16_t port)
+
+ Binds the pcb to a local IP address and port number. The IP address
+ can be specified as IP_ADDR_ANY in order to bind the connection to
+ all local IP addresses.
+
+ If another connection is bound to the same port, the function will
+ return ERR_USE, otherwise ERR_OK is returned.
+
+- struct tcp_pcb *tcp_listen(struct tcp_pcb *pcb)
+
+ Commands a pcb to start listening for incoming connections. When an
+ incoming connection is accepted, the function specified with the
+ tcp_accept() function will be called. The pcb will have to be bound
+ to a local port with the tcp_bind() function.
+
+ The tcp_listen() function returns a new connection identifier, and
+ the one passed as an argument to the function will be
+ deallocated. The reason for this behavior is that less memory is
+ needed for a connection that is listening, so tcp_listen() will
+ reclaim the memory needed for the original connection and allocate a
+ new smaller memory block for the listening connection.
+
+ tcp_listen() may return NULL if no memory was available for the
+ listening connection. If so, the memory associated with the pcb
+ passed as an argument to tcp_listen() will not be deallocated.
+
+- struct tcp_pcb *tcp_listen_with_backlog(struct tcp_pcb *pcb, u8_t backlog)
+
+ Same as tcp_listen, but limits the number of outstanding connections
+ in the listen queue to the value specified by the backlog argument.
+ To use it, your need to set TCP_LISTEN_BACKLOG=1 in your lwipopts.h.
+
+- void tcp_accepted(struct tcp_pcb *pcb)
+
+ Inform lwIP that an incoming connection has been accepted. This would
+ usually be called from the accept callback. This allows lwIP to perform
+ housekeeping tasks, such as allowing further incoming connections to be
+ queued in the listen backlog.
+
+- void tcp_accept(struct tcp_pcb *pcb,
+ err_t (* accept)(void *arg, struct tcp_pcb *newpcb,
+ err_t err))
+
+ Specified the callback function that should be called when a new
+ connection arrives on a listening connection.
+
+- err_t tcp_connect(struct tcp_pcb *pcb, struct ip_addr *ipaddr,
+ u16_t port, err_t (* connected)(void *arg,
+ struct tcp_pcb *tpcb,
+ err_t err));
+
+ Sets up the pcb to connect to the remote host and sends the
+ initial SYN segment which opens the connection.
+
+ The tcp_connect() function returns immediately; it does not wait for
+ the connection to be properly setup. Instead, it will call the
+ function specified as the fourth argument (the "connected" argument)
+ when the connection is established. If the connection could not be
+ properly established, either because the other host refused the
+ connection or because the other host didn't answer, the "err"
+ callback function of this pcb (registered with tcp_err, see below)
+ will be called.
+
+ The tcp_connect() function can return ERR_MEM if no memory is
+ available for enqueueing the SYN segment. If the SYN indeed was
+ enqueued successfully, the tcp_connect() function returns ERR_OK.
+
+
+--- Sending TCP data
+
+TCP data is sent by enqueueing the data with a call to
+tcp_write(). When the data is successfully transmitted to the remote
+host, the application will be notified with a call to a specified
+callback function.
+
+- err_t tcp_write(struct tcp_pcb *pcb, void *dataptr, u16_t len,
+ u8_t copy)
+
+ Enqueues the data pointed to by the argument dataptr. The length of
+ the data is passed as the len parameter. The copy argument is either
+ 0 or 1 and indicates whether the new memory should be allocated for
+ the data to be copied into. If the argument is 0, no new memory
+ should be allocated and the data should only be referenced by
+ pointer.
+
+ The tcp_write() function will fail and return ERR_MEM if the length
+ of the data exceeds the current send buffer size or if the length of
+ the queue of outgoing segment is larger than the upper limit defined
+ in lwipopts.h. The number of bytes available in the output queue can
+ be retrieved with the tcp_sndbuf() function.
+
+ The proper way to use this function is to call the function with at
+ most tcp_sndbuf() bytes of data. If the function returns ERR_MEM,
+ the application should wait until some of the currently enqueued
+ data has been successfully received by the other host and try again.
+
+- void tcp_sent(struct tcp_pcb *pcb,
+ err_t (* sent)(void *arg, struct tcp_pcb *tpcb,
+ u16_t len))
+
+ Specifies the callback function that should be called when data has
+ successfully been received (i.e., acknowledged) by the remote
+ host. The len argument passed to the callback function gives the
+ amount bytes that was acknowledged by the last acknowledgment.
+
+
+--- Receiving TCP data
+
+TCP data reception is callback based - an application specified
+callback function is called when new data arrives. When the
+application has taken the data, it has to call the tcp_recved()
+function to indicate that TCP can advertise increase the receive
+window.
+
+- void tcp_recv(struct tcp_pcb *pcb,
+ err_t (* recv)(void *arg, struct tcp_pcb *tpcb,
+ struct pbuf *p, err_t err))
+
+ Sets the callback function that will be called when new data
+ arrives. The callback function will be passed a NULL pbuf to
+ indicate that the remote host has closed the connection. If
+ there are no errors and the callback function is to return
+ ERR_OK, then it must free the pbuf. Otherwise, it must not
+ free the pbuf so that lwIP core code can store it.
+
+- void tcp_recved(struct tcp_pcb *pcb, u16_t len)
+
+ Must be called when the application has received the data. The len
+ argument indicates the length of the received data.
+
+
+--- Application polling
+
+When a connection is idle (i.e., no data is either transmitted or
+received), lwIP will repeatedly poll the application by calling a
+specified callback function. This can be used either as a watchdog
+timer for killing connections that have stayed idle for too long, or
+as a method of waiting for memory to become available. For instance,
+if a call to tcp_write() has failed because memory wasn't available,
+the application may use the polling functionality to call tcp_write()
+again when the connection has been idle for a while.
+
+- void tcp_poll(struct tcp_pcb *pcb, u8_t interval,
+ err_t (* poll)(void *arg, struct tcp_pcb *tpcb))
+
+ Specifies the polling interval and the callback function that should
+ be called to poll the application. The interval is specified in
+ number of TCP coarse grained timer shots, which typically occurs
+ twice a second. An interval of 10 means that the application would
+ be polled every 5 seconds.
+
+
+--- Closing and aborting connections
+
+- err_t tcp_close(struct tcp_pcb *pcb)
+
+ Closes the connection. The function may return ERR_MEM if no memory
+ was available for closing the connection. If so, the application
+ should wait and try again either by using the acknowledgment
+ callback or the polling functionality. If the close succeeds, the
+ function returns ERR_OK.
+
+ The pcb is deallocated by the TCP code after a call to tcp_close().
+
+- void tcp_abort(struct tcp_pcb *pcb)
+
+ Aborts the connection by sending a RST (reset) segment to the remote
+ host. The pcb is deallocated. This function never fails.
+
+If a connection is aborted because of an error, the application is
+alerted of this event by the err callback. Errors that might abort a
+connection are when there is a shortage of memory. The callback
+function to be called is set using the tcp_err() function.
+
+- void tcp_err(struct tcp_pcb *pcb, void (* err)(void *arg,
+ err_t err))
+
+ The error callback function does not get the pcb passed to it as a
+ parameter since the pcb may already have been deallocated.
+
+
+--- Lower layer TCP interface
+
+TCP provides a simple interface to the lower layers of the
+system. During system initialization, the function tcp_init() has
+to be called before any other TCP function is called. When the system
+is running, the two timer functions tcp_fasttmr() and tcp_slowtmr()
+must be called with regular intervals. The tcp_fasttmr() should be
+called every TCP_FAST_INTERVAL milliseconds (defined in tcp.h) and
+tcp_slowtmr() should be called every TCP_SLOW_INTERVAL milliseconds.
+
+
+--- UDP interface
+
+The UDP interface is similar to that of TCP, but due to the lower
+level of complexity of UDP, the interface is significantly simpler.
+
+- struct udp_pcb *udp_new(void)
+
+ Creates a new UDP pcb which can be used for UDP communication. The
+ pcb is not active until it has either been bound to a local address
+ or connected to a remote address.
+
+- void udp_remove(struct udp_pcb *pcb)
+
+ Removes and deallocates the pcb.
+
+- err_t udp_bind(struct udp_pcb *pcb, struct ip_addr *ipaddr,
+ u16_t port)
+
+ Binds the pcb to a local address. The IP-address argument "ipaddr"
+ can be IP_ADDR_ANY to indicate that it should listen to any local IP
+ address. The function currently always return ERR_OK.
+
+- err_t udp_connect(struct udp_pcb *pcb, struct ip_addr *ipaddr,
+ u16_t port)
+
+ Sets the remote end of the pcb. This function does not generate any
+ network traffic, but only set the remote address of the pcb.
+
+- err_t udp_disconnect(struct udp_pcb *pcb)
+
+ Remove the remote end of the pcb. This function does not generate
+ any network traffic, but only removes the remote address of the pcb.
+
+- err_t udp_send(struct udp_pcb *pcb, struct pbuf *p)
+
+ Sends the pbuf p. The pbuf is not deallocated.
+
+- void udp_recv(struct udp_pcb *pcb,
+ void (* recv)(void *arg, struct udp_pcb *upcb,
+ struct pbuf *p,
+ struct ip_addr *addr,
+ u16_t port),
+ void *recv_arg)
+
+ Specifies a callback function that should be called when a UDP
+ datagram is received.
+
+
+--- System initalization
+
+A truly complete and generic sequence for initializing the lwip stack
+cannot be given because it depends on the build configuration (lwipopts.h)
+and additional initializations for your runtime environment (e.g. timers).
+
+We can give you some idea on how to proceed when using the raw API.
+We assume a configuration using a single Ethernet netif and the
+UDP and TCP transport layers, IPv4 and the DHCP client.
+
+Call these functions in the order of appearance:
+
+- stats_init()
+
+ Clears the structure where runtime statistics are gathered.
+
+- sys_init()
+
+ Not of much use since we set the NO_SYS 1 option in lwipopts.h,
+ to be called for easy configuration changes.
+
+- mem_init()
+
+ Initializes the dynamic memory heap defined by MEM_SIZE.
+
+- memp_init()
+
+ Initializes the memory pools defined by MEMP_NUM_x.
+
+- pbuf_init()
+
+ Initializes the pbuf memory pool defined by PBUF_POOL_SIZE.
+
+- etharp_init()
+
+ Initializes the ARP table and queue.
+ Note: you must call etharp_tmr at a ARP_TMR_INTERVAL (5 seconds) regular interval
+ after this initialization.
+
+- ip_init()
+
+ Doesn't do much, it should be called to handle future changes.
+
+- udp_init()
+
+ Clears the UDP PCB list.
+
+- tcp_init()
+
+ Clears the TCP PCB list and clears some internal TCP timers.
+ Note: you must call tcp_fasttmr() and tcp_slowtmr() at the
+ predefined regular intervals after this initialization.
+
+- netif_add(struct netif *netif, struct ip_addr *ipaddr,
+ struct ip_addr *netmask, struct ip_addr *gw,
+ void *state, err_t (* init)(struct netif *netif),
+ err_t (* input)(struct pbuf *p, struct netif *netif))
+
+ Adds your network interface to the netif_list. Allocate a struct
+ netif and pass a pointer to this structure as the first argument.
+ Give pointers to cleared ip_addr structures when using DHCP,
+ or fill them with sane numbers otherwise. The state pointer may be NULL.
+
+ The init function pointer must point to a initialization function for
+ your ethernet netif interface. The following code illustrates it's use.
+
+ err_t netif_if_init(struct netif *netif)
+ {
+ u8_t i;
+
+ for(i = 0; i < ETHARP_HWADDR_LEN; i++) netif->hwaddr[i] = some_eth_addr[i];
+ init_my_eth_device();
+ return ERR_OK;
+ }
+
+ For ethernet drivers, the input function pointer must point to the lwip
+ function ethernet_input() declared in "netif/etharp.h". Other drivers
+ must use ip_input() declared in "lwip/ip.h".
+
+- netif_set_default(struct netif *netif)
+
+ Registers the default network interface.
+
+- netif_set_up(struct netif *netif)
+
+ When the netif is fully configured this function must be called.
+
+- dhcp_start(struct netif *netif)
+
+ Creates a new DHCP client for this interface on the first call.
+ Note: you must call dhcp_fine_tmr() and dhcp_coarse_tmr() at
+ the predefined regular intervals after starting the client.
+
+ You can peek in the netif->dhcp struct for the actual DHCP status.
+
+
+--- Optimalization hints
+
+The first thing you want to optimize is the lwip_standard_checksum()
+routine from src/core/inet.c. You can override this standard
+function with the #define LWIP_CHKSUM <your_checksum_routine>.
+
+There are C examples given in inet.c or you might want to
+craft an assembly function for this. RFC1071 is a good
+introduction to this subject.
+
+Other significant improvements can be made by supplying
+assembly or inline replacements for htons() and htonl()
+if you're using a little-endian architecture.
+#define LWIP_PLATFORM_BYTESWAP 1
+#define LWIP_PLATFORM_HTONS(x) <your_htons>
+#define LWIP_PLATFORM_HTONL(x) <your_htonl>
+
+Check your network interface driver if it reads at
+a higher speed than the maximum wire-speed. If the
+hardware isn't serviced frequently and fast enough
+buffer overflows are likely to occur.
+
+E.g. when using the cs8900 driver, call cs8900if_service(ethif)
+as frequently as possible. When using an RTOS let the cs8900 interrupt
+wake a high priority task that services your driver using a binary
+semaphore or event flag. Some drivers might allow additional tuning
+to match your application and network.
+
+For a production release it is recommended to set LWIP_STATS to 0.
+Note that speed performance isn't influenced much by simply setting
+high values to the memory options.
diff --git a/core/lwip/doc/savannah.txt b/core/lwip/doc/savannah.txt
new file mode 100644
index 00000000..409905b1
--- /dev/null
+++ b/core/lwip/doc/savannah.txt
@@ -0,0 +1,135 @@
+Daily Use Guide for using Savannah for lwIP
+
+Table of Contents:
+
+1 - Obtaining lwIP from the CVS repository
+2 - Committers/developers CVS access using SSH (to be written)
+3 - Merging from DEVEL branch to main trunk (stable branch)
+4 - How to release lwIP
+
+
+
+1 Obtaining lwIP from the CVS repository
+----------------------------------------
+
+To perform an anonymous CVS checkout of the main trunk (this is where
+bug fixes and incremental enhancements occur), do this:
+
+cvs -z3 -d:pserver:anonymous@cvs.sv.gnu.org:/sources/lwip checkout lwip
+
+Or, obtain a stable branch (updated with bug fixes only) as follows:
+cvs -z3 -d:pserver:anonymous@cvs.sv.gnu.org:/sources/lwip checkout \
+ -r STABLE-0_7 -d lwip-0.7 lwip
+
+Or, obtain a specific (fixed) release as follows:
+cvs -z3 -d:pserver:anonymous@cvs.sv.gnu.org:/sources/lwip checkout \
+ -r STABLE-0_7_0 -d lwip-0.7.0 lwip
+
+3 Committers/developers CVS access using SSH
+--------------------------------------------
+
+The Savannah server uses SSH (Secure Shell) protocol 2 authentication and encryption.
+As such, CVS commits to the server occur through a SSH tunnel for project members.
+To create a SSH2 key pair in UNIX-like environments, do this:
+
+ssh-keygen -t dsa
+
+Under Windows, a recommended SSH client is "PuTTY", freely available with good
+documentation and a graphic user interface. Use its key generator.
+
+Now paste the id_dsa.pub contents into your Savannah account public key list. Wait
+a while so that Savannah can update its configuration (This can take minutes).
+
+Try to login using SSH:
+
+ssh -v your_login@cvs.sv.gnu.org
+
+If it tells you:
+
+Authenticating with public key "your_key_name"...
+Server refused to allocate pty
+
+then you could login; Savannah refuses to give you a shell - which is OK, as we
+are allowed to use SSH for CVS only. Now, you should be able to do this:
+
+export CVS_RSH=ssh
+cvs -z3 -d:ext:your_login@cvs.sv.gnu.org:/sources/lwip co lwip
+
+after which you can edit your local files with bug fixes or new features and
+commit them. Make sure you know what you are doing when using CVS to make
+changes on the repository. If in doubt, ask on the lwip-members mailing list.
+
+(If SSH asks about authenticity of the host, you can check the key
+ fingerprint against http://savannah.nongnu.org/cvs/?group=lwip)
+
+
+3 Merging from DEVEL branch to main trunk (stable)
+--------------------------------------------------
+
+Merging is a delicate process in CVS and requires the
+following disciplined steps in order to prevent conflicts
+in the future. Conflicts can be hard to solve!
+
+Merging from branch A to branch B requires that the A branch
+has a tag indicating the previous merger. This tag is called
+'merged_from_A_to_B'. After merging, the tag is moved in the
+A branch to remember this merger for future merge actions.
+
+IMPORTANT: AFTER COMMITTING A SUCCESFUL MERGE IN THE
+REPOSITORY, THE TAG MUST BE SET ON THE SOURCE BRANCH OF THE
+MERGE ACTION (REPLACING EXISTING TAGS WITH THE SAME NAME).
+
+Merge all changes in DEVEL since our last merge to main:
+
+In the working copy of the main trunk:
+cvs update -P -jmerged_from_DEVEL_to_main -jDEVEL
+
+(This will apply the changes between 'merged_from_DEVEL_to_main'
+and 'DEVEL' to your work set of files)
+
+We can now commit the merge result.
+cvs commit -R -m "Merged from DEVEL to main."
+
+If this worked out OK, we now move the tag in the DEVEL branch
+to this merge point, so we can use this point for future merges:
+
+cvs rtag -F -r DEVEL merged_from_DEVEL_to_main lwip
+
+4 How to release lwIP
+---------------------
+
+First, checkout a clean copy of the branch to be released. Tag this set with
+tag name "STABLE-0_6_3". (I use release number 0.6.3 throughout this example).
+
+Login CVS using pserver authentication, then export a clean copy of the
+tagged tree. Export is similar to a checkout, except that the CVS metadata
+is not created locally.
+
+export CVS_RSH=ssh
+cvs -z3 -d:pserver:anonymous@cvs.sv.gnu.org:/sources/lwip checkout \
+ -r STABLE-0_6_3 -d lwip-0.6.3 lwip
+
+Archive this directory using tar, gzip'd, bzip2'd and zip'd.
+
+tar czvf lwip-0.6.3.tar.gz lwip-0.6.3
+tar cjvf lwip-0.6.3.tar.bz2 lwip-0.6.3
+zip -r lwip-0.6.3.zip lwip-0.6.3
+
+Now, sign the archives with a detached GPG binary signature as follows:
+
+gpg -b lwip-0.6.3.tar.gz
+gpg -b lwip-0.6.3.tar.bz2
+gpg -b lwip-0.6.3.zip
+
+Upload these files using anonymous FTP:
+ncftp ftp://savannah.gnu.org/incoming/savannah/lwip
+
+ncftp>mput *0.6.3.*
+
+Additionally, you may post a news item on Savannah, like this:
+
+A new 0.6.3 release is now available here:
+http://savannah.nongnu.org/files/?group=lwip&highlight=0.6.3
+
+You will have to submit this via the user News interface, then approve
+this via the Administrator News interface. \ No newline at end of file
diff --git a/core/lwip/doc/snmp_agent.txt b/core/lwip/doc/snmp_agent.txt
new file mode 100644
index 00000000..9b58616a
--- /dev/null
+++ b/core/lwip/doc/snmp_agent.txt
@@ -0,0 +1,181 @@
+SNMPv1 agent for lwIP
+
+Author: Christiaan Simons
+
+This is a brief introduction how to use and configure the SNMP agent.
+Note the agent uses the raw-API UDP interface so you may also want to
+read rawapi.txt to gain a better understanding of the SNMP message handling.
+
+0 Agent Capabilities
+====================
+
+SNMPv1 per RFC1157
+ This is an old(er) standard but is still widely supported.
+ For SNMPv2c and v3 have a greater complexity and need many
+ more lines of code. IMHO this breaks the idea of "lightweight IP".
+
+ Note the S in SNMP stands for "Simple". Note that "Simple" is
+ relative. SNMP is simple compared to the complex ISO network
+ management protocols CMIP (Common Management Information Protocol)
+ and CMOT (CMip Over Tcp).
+
+MIB II per RFC1213
+ The standard lwIP stack management information base.
+ This is a required MIB, so this is always enabled.
+ When builing lwIP without TCP, the mib-2.tcp group is omitted.
+ The groups EGP, CMOT and transmission are disabled by default.
+
+ Most mib-2 objects are not writable except:
+ sysName, sysLocation, sysContact, snmpEnableAuthenTraps.
+ Writing to or changing the ARP and IP address and route
+ tables is not possible.
+
+ Note lwIP has a very limited notion of IP routing. It currently
+ doen't have a route table and doesn't have a notion of the U,G,H flags.
+ Instead lwIP uses the interface list with only one default interface
+ acting as a single gateway interface (G) for the default route.
+
+ The agent returns a "virtual table" with the default route 0.0.0.0
+ for the default interface and network routes (no H) for each
+ network interface in the netif_list.
+ All routes are considered to be up (U).
+
+Loading additional MIBs
+ MIBs can only be added in compile-time, not in run-time.
+ There is no MIB compiler thus additional MIBs must be hand coded.
+
+Large SNMP message support
+ The packet decoding and encoding routines are designed
+ to use pbuf-chains. Larger payloads then the minimum
+ SNMP requirement of 484 octets are supported if the
+ PBUF_POOL_SIZE and IP_REASS_BUFSIZE are set to match your
+ local requirement.
+
+1 Building the Agent
+====================
+
+First of all you'll need to add the following define
+to your local lwipopts.h:
+
+#define LWIP_SNMP 1
+
+and add the source files in lwip/src/core/snmp
+and some snmp headers in lwip/src/include/lwip to your makefile.
+
+Note you'll might need to adapt you network driver to update
+the mib2 variables for your interface.
+
+2 Running the Agent
+===================
+
+The following function calls must be made in your program to
+actually get the SNMP agent running.
+
+Before starting the agent you should supply pointers
+to non-volatile memory for sysContact, sysLocation,
+and snmpEnableAuthenTraps. You can do this by calling
+
+snmp_set_syscontact()
+snmp_set_syslocation()
+snmp_set_snmpenableauthentraps()
+
+Additionally you may want to set
+
+snmp_set_sysdescr()
+snmp_set_sysobjid() (if you have a private MIB)
+snmp_set_sysname()
+
+Also before starting the agent you need to setup
+one or more trap destinations using these calls:
+
+snmp_trap_dst_enable();
+snmp_trap_dst_ip_set();
+
+In the lwIP initialisation sequence call snmp_init() just after
+the call to udp_init().
+
+Exactly every 10 msec the SNMP uptime timestamp must be updated with
+snmp_inc_sysuptime(). You should call this from a timer interrupt
+or a timer signal handler depending on your runtime environment.
+
+An alternative way to update the SNMP uptime timestamp is to do a call like
+snmp_add_sysuptime(100) each 1000ms (which is bigger "step", but call to
+a lower frequency). Another one is to not call snmp_inc_sysuptime() or
+snmp_add_sysuptime(), and to define the SNMP_GET_SYSUPTIME(sysuptime) macro.
+This one is undefined by default in mib2.c. SNMP_GET_SYSUPTIME is called inside
+snmp_get_sysuptime(u32_t *value), and enable to change "sysuptime" value only
+when it's queried (any function which need "sysuptime" have to call
+snmp_get_sysuptime).
+
+
+3 Private MIBs
+==============
+
+If want to extend the agent with your own private MIB you'll need to
+add the following define to your local lwipopts.h:
+
+#define SNMP_PRIVATE_MIB 1
+
+You must provide the private_mib.h and associated files yourself.
+Note we don't have a "MIB compiler" that generates C source from a MIB,
+so you're required to do some serious coding if you enable this!
+
+Note the lwIP enterprise ID (26381) is assigned to the lwIP project,
+ALL OBJECT IDENTIFIERS LIVING UNDER THIS ID ARE ASSIGNED BY THE lwIP
+MAINTAINERS!
+
+If you need to create your own private MIB you'll need
+to apply for your own enterprise ID with IANA: http://www.iana.org/numbers.html
+
+You can set it by passing a struct snmp_obj_id to the agent
+using snmp_set_sysobjid(&my_object_id), just before snmp_init().
+
+Note the object identifiers for thes MIB-2 and your private MIB
+tree must be kept in sorted ascending (lexicographical) order.
+This to ensure correct getnext operation.
+
+An example for a private MIB is part of the "minimal Unix" project:
+contrib/ports/unix/proj/minimal/lwip_prvmib.c
+
+The next chapter gives a more detailed description of the
+MIB-2 tree and the optional private MIB.
+
+4 The Gory Details
+==================
+
+4.0 Object identifiers and the MIB tree.
+
+We have three distinct parts for all object identifiers:
+
+The prefix
+ .iso.org.dod.internet
+
+the middle part
+ .mgmt.mib-2.ip.ipNetToMediaTable.ipNetToMediaEntry.ipNetToMediaPhysAddress
+
+and the index part
+ .1.192.168.0.1
+
+Objects located above the .internet hierarchy aren't supported.
+Currently only the .mgmt sub-tree is available and
+when the SNMP_PRIVATE_MIB is enabled the .private tree
+becomes available too.
+
+Object identifiers from incoming requests are checked
+for a matching prefix, middle part and index part
+or are expanded(*) for GetNext requests with short
+or inexisting names in the request.
+(* we call this "expansion" but this also
+resembles the "auto-completion" operation)
+
+The middle part is usually located in ROM (const)
+to preserve precious RAM on small microcontrollers.
+However RAM location is possible for an dynamically
+changing private tree.
+
+The index part is handled by functions which in
+turn use dynamically allocated index trees from RAM.
+These trees are updated by e.g. the etharp code
+when new entries are made or removed form the ARP cache.
+
+/** @todo more gory details */
diff --git a/core/lwip/doc/sys_arch.txt b/core/lwip/doc/sys_arch.txt
new file mode 100644
index 00000000..66310a91
--- /dev/null
+++ b/core/lwip/doc/sys_arch.txt
@@ -0,0 +1,228 @@
+sys_arch interface for lwIP 0.6++
+
+Author: Adam Dunkels
+
+The operating system emulation layer provides a common interface
+between the lwIP code and the underlying operating system kernel. The
+general idea is that porting lwIP to new architectures requires only
+small changes to a few header files and a new sys_arch
+implementation. It is also possible to do a sys_arch implementation
+that does not rely on any underlying operating system.
+
+The sys_arch provides semaphores and mailboxes to lwIP. For the full
+lwIP functionality, multiple threads support can be implemented in the
+sys_arch, but this is not required for the basic lwIP
+functionality. Previous versions of lwIP required the sys_arch to
+implement timer scheduling as well but as of lwIP 0.5 this is
+implemented in a higher layer.
+
+In addition to the source file providing the functionality of sys_arch,
+the OS emulation layer must provide several header files defining
+macros used throughout lwip. The files required and the macros they
+must define are listed below the sys_arch description.
+
+Semaphores can be either counting or binary - lwIP works with both
+kinds. Mailboxes are used for message passing and can be implemented
+either as a queue which allows multiple messages to be posted to a
+mailbox, or as a rendez-vous point where only one message can be
+posted at a time. lwIP works with both kinds, but the former type will
+be more efficient. A message in a mailbox is just a pointer, nothing
+more.
+
+Semaphores are represented by the type "sys_sem_t" which is typedef'd
+in the sys_arch.h file. Mailboxes are equivalently represented by the
+type "sys_mbox_t". lwIP does not place any restrictions on how
+sys_sem_t or sys_mbox_t are represented internally.
+
+The following functions must be implemented by the sys_arch:
+
+- void sys_init(void)
+
+ Is called to initialize the sys_arch layer.
+
+- sys_sem_t sys_sem_new(u8_t count)
+
+ Creates and returns a new semaphore. The "count" argument specifies
+ the initial state of the semaphore.
+
+- void sys_sem_free(sys_sem_t sem)
+
+ Deallocates a semaphore.
+
+- void sys_sem_signal(sys_sem_t sem)
+
+ Signals a semaphore.
+
+- u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout)
+
+ Blocks the thread while waiting for the semaphore to be
+ signaled. If the "timeout" argument is non-zero, the thread should
+ only be blocked for the specified time (measured in
+ milliseconds). If the "timeout" argument is zero, the thread should be
+ blocked until the semaphore is signalled.
+
+ If the timeout argument is non-zero, the return value is the number of
+ milliseconds spent waiting for the semaphore to be signaled. If the
+ semaphore wasn't signaled within the specified time, the return value is
+ SYS_ARCH_TIMEOUT. If the thread didn't have to wait for the semaphore
+ (i.e., it was already signaled), the function may return zero.
+
+ Notice that lwIP implements a function with a similar name,
+ sys_sem_wait(), that uses the sys_arch_sem_wait() function.
+
+- sys_mbox_t sys_mbox_new(int size)
+
+ Creates an empty mailbox for maximum "size" elements. Elements stored
+ in mailboxes are pointers. You have to define macros "_MBOX_SIZE"
+ in your lwipopts.h, or ignore this parameter in your implementation
+ and use a default size.
+
+- void sys_mbox_free(sys_mbox_t mbox)
+
+ Deallocates a mailbox. If there are messages still present in the
+ mailbox when the mailbox is deallocated, it is an indication of a
+ programming error in lwIP and the developer should be notified.
+
+- void sys_mbox_post(sys_mbox_t mbox, void *msg)
+
+ Posts the "msg" to the mailbox. This function have to block until
+ the "msg" is really posted.
+
+- err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg)
+
+ Try to post the "msg" to the mailbox. Returns ERR_MEM if this one
+ is full, else, ERR_OK if the "msg" is posted.
+
+- u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout)
+
+ Blocks the thread until a message arrives in the mailbox, but does
+ not block the thread longer than "timeout" milliseconds (similar to
+ the sys_arch_sem_wait() function). If "timeout" is 0, the thread should
+ be blocked until a message arrives. The "msg" argument is a result
+ parameter that is set by the function (i.e., by doing "*msg =
+ ptr"). The "msg" parameter maybe NULL to indicate that the message
+ should be dropped.
+
+ The return values are the same as for the sys_arch_sem_wait() function:
+ Number of milliseconds spent waiting or SYS_ARCH_TIMEOUT if there was a
+ timeout.
+
+ Note that a function with a similar name, sys_mbox_fetch(), is
+ implemented by lwIP.
+
+- u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg)
+
+ This is similar to sys_arch_mbox_fetch, however if a message is not
+ present in the mailbox, it immediately returns with the code
+ SYS_MBOX_EMPTY. On success 0 is returned.
+
+ To allow for efficient implementations, this can be defined as a
+ function-like macro in sys_arch.h instead of a normal function. For
+ example, a naive implementation could be:
+ #define sys_arch_mbox_tryfetch(mbox,msg) \
+ sys_arch_mbox_fetch(mbox,msg,1)
+ although this would introduce unnecessary delays.
+
+- struct sys_timeouts *sys_arch_timeouts(void)
+
+ Returns a pointer to the per-thread sys_timeouts structure. In lwIP,
+ each thread has a list of timeouts which is repressented as a linked
+ list of sys_timeout structures. The sys_timeouts structure holds a
+ pointer to a linked list of timeouts. This function is called by
+ the lwIP timeout scheduler and must not return a NULL value.
+
+ In a single thread sys_arch implementation, this function will
+ simply return a pointer to a global sys_timeouts variable stored in
+ the sys_arch module.
+
+If threads are supported by the underlying operating system and if
+such functionality is needed in lwIP, the following function will have
+to be implemented as well:
+
+- sys_thread_t sys_thread_new(char *name, void (* thread)(void *arg), void *arg, int stacksize, int prio)
+
+ Starts a new thread named "name" with priority "prio" that will begin its
+ execution in the function "thread()". The "arg" argument will be passed as an
+ argument to the thread() function. The stack size to used for this thread is
+ the "stacksize" parameter. The id of the new thread is returned. Both the id
+ and the priority are system dependent.
+
+- sys_prot_t sys_arch_protect(void)
+
+ This optional function does a "fast" critical region protection and returns
+ the previous protection level. This function is only called during very short
+ critical regions. An embedded system which supports ISR-based drivers might
+ want to implement this function by disabling interrupts. Task-based systems
+ might want to implement this by using a mutex or disabling tasking. This
+ function should support recursive calls from the same task or interrupt. In
+ other words, sys_arch_protect() could be called while already protected. In
+ that case the return value indicates that it is already protected.
+
+ sys_arch_protect() is only required if your port is supporting an operating
+ system.
+
+- void sys_arch_unprotect(sys_prot_t pval)
+
+ This optional function does a "fast" set of critical region protection to the
+ value specified by pval. See the documentation for sys_arch_protect() for
+ more information. This function is only required if your port is supporting
+ an operating system.
+
+Note:
+
+Be carefull with using mem_malloc() in sys_arch. When malloc() refers to
+mem_malloc() you can run into a circular function call problem. In mem.c
+mem_init() tries to allcate a semaphore using mem_malloc, which of course
+can't be performed when sys_arch uses mem_malloc.
+
+-------------------------------------------------------------------------------
+Additional files required for the "OS support" emulation layer:
+-------------------------------------------------------------------------------
+
+cc.h - Architecture environment, some compiler specific, some
+ environment specific (probably should move env stuff
+ to sys_arch.h.)
+
+ Typedefs for the types used by lwip -
+ u8_t, s8_t, u16_t, s16_t, u32_t, s32_t, mem_ptr_t
+
+ Compiler hints for packing lwip's structures -
+ PACK_STRUCT_FIELD(x)
+ PACK_STRUCT_STRUCT
+ PACK_STRUCT_BEGIN
+ PACK_STRUCT_END
+
+ Platform specific diagnostic output -
+ LWIP_PLATFORM_DIAG(x) - non-fatal, print a message.
+ LWIP_PLATFORM_ASSERT(x) - fatal, print message and abandon execution.
+ Portability defines for printf formatters:
+ U16_F, S16_F, X16_F, U32_F, S32_F, X32_F, SZT_F
+
+ "lightweight" synchronization mechanisms -
+ SYS_ARCH_DECL_PROTECT(x) - declare a protection state variable.
+ SYS_ARCH_PROTECT(x) - enter protection mode.
+ SYS_ARCH_UNPROTECT(x) - leave protection mode.
+
+ If the compiler does not provide memset() this file must include a
+ definition of it, or include a file which defines it.
+
+ This file must either include a system-local <errno.h> which defines
+ the standard *nix error codes, or it should #define LWIP_PROVIDE_ERRNO
+ to make lwip/arch.h define the codes which are used throughout.
+
+
+perf.h - Architecture specific performance measurement.
+ Measurement calls made throughout lwip, these can be defined to nothing.
+ PERF_START - start measuring something.
+ PERF_STOP(x) - stop measuring something, and record the result.
+
+sys_arch.h - Tied to sys_arch.c
+
+ Arch dependent types for the following objects:
+ sys_sem_t, sys_mbox_t, sys_thread_t,
+ And, optionally:
+ sys_prot_t
+
+ Defines to set vars of sys_mbox_t and sys_sem_t to NULL.
+ SYS_MBOX_NULL NULL
+ SYS_SEM_NULL NULL
diff --git a/core/lwip/src/.hgignore b/core/lwip/src/.hgignore
new file mode 100644
index 00000000..f88587df
--- /dev/null
+++ b/core/lwip/src/.hgignore
@@ -0,0 +1,26 @@
+syntax: glob
+
+*.pyc
+*.orig
+*.rej
+*~
+TAGS
+Module.symvers
+*.ncb
+*.suo
+*.bak
+*.orig
+*.rej
+
+syntax: regexp
+\.\#.+
+[\\/]CVS$
+^CVS$
+^build$
+^install$
+^logs.build_tree$
+[\\/]bin$
+^bin$
+[\\/]obj$
+^obj$
+\.cvsignore
diff --git a/core/lwip/src/FILES b/core/lwip/src/FILES
new file mode 100644
index 00000000..952aeabb
--- /dev/null
+++ b/core/lwip/src/FILES
@@ -0,0 +1,13 @@
+api/ - The code for the high-level wrapper API. Not needed if
+ you use the lowel-level call-back/raw API.
+
+core/ - The core of the TPC/IP stack; protocol implementations,
+ memory and buffer management, and the low-level raw API.
+
+include/ - lwIP include files.
+
+netif/ - Generic network interface device drivers are kept here,
+ as well as the ARP module.
+
+For more information on the various subdirectories, check the FILES
+file in each directory.
diff --git a/core/lwip/src/api/api_lib.c b/core/lwip/src/api/api_lib.c
new file mode 100644
index 00000000..86df911e
--- /dev/null
+++ b/core/lwip/src/api/api_lib.c
@@ -0,0 +1,557 @@
+/**
+ * @file
+ * Sequential API External module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+/* This is the part of the API that is linked with
+ the application */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/api.h"
+#include "lwip/tcpip.h"
+#include "lwip/memp.h"
+
+#include "lwip/ip.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+
+#include <string.h>
+
+/**
+ * Create a new netconn (of a specific type) that has a callback function.
+ * The corresponding pcb is also created.
+ *
+ * @param t the type of 'connection' to create (@see enum netconn_type)
+ * @param proto the IP protocol for RAW IP pcbs
+ * @param callback a function to call on status changes (RX available, TX'ed)
+ * @return a newly allocated struct netconn or
+ * NULL on memory error
+ */
+struct netconn*
+netconn_new_with_proto_and_callback(enum netconn_type t, u8_t proto, netconn_callback callback)
+{
+ struct netconn *conn;
+ struct api_msg msg;
+
+ conn = netconn_alloc(t, callback);
+ if (conn != NULL ) {
+ msg.function = do_newconn;
+ msg.msg.msg.n.proto = proto;
+ msg.msg.conn = conn;
+ TCPIP_APIMSG(&msg);
+
+ if (conn->err != ERR_OK) {
+ LWIP_ASSERT("freeing conn without freeing pcb", conn->pcb.tcp == NULL);
+ LWIP_ASSERT("conn has no op_completed", conn->op_completed != SYS_SEM_NULL);
+ LWIP_ASSERT("conn has no recvmbox", conn->recvmbox != SYS_MBOX_NULL);
+ LWIP_ASSERT("conn->acceptmbox shouldn't exist", conn->acceptmbox == SYS_MBOX_NULL);
+ sys_sem_free(conn->op_completed);
+ sys_mbox_free(conn->recvmbox);
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+ }
+ return conn;
+}
+
+/**
+ * Close a netconn 'connection' and free its resources.
+ * UDP and RAW connection are completely closed, TCP pcbs might still be in a waitstate
+ * after this returns.
+ *
+ * @param conn the netconn to delete
+ * @return ERR_OK if the connection was deleted
+ */
+err_t
+netconn_delete(struct netconn *conn)
+{
+ struct api_msg msg;
+
+ /* No ASSERT here because possible to get a (conn == NULL) if we got an accept error */
+ if (conn == NULL) {
+ return ERR_OK;
+ }
+
+ msg.function = do_delconn;
+ msg.msg.conn = conn;
+ tcpip_apimsg(&msg);
+
+ conn->pcb.tcp = NULL;
+ netconn_free(conn);
+
+ return ERR_OK;
+}
+
+/**
+ * Get the local or remote IP address and port of a netconn.
+ * For RAW netconns, this returns the protocol instead of a port!
+ *
+ * @param conn the netconn to query
+ * @param addr a pointer to which to save the IP address
+ * @param port a pointer to which to save the port (or protocol for RAW)
+ * @param local 1 to get the local IP address, 0 to get the remote one
+ * @return ERR_CONN for invalid connections
+ * ERR_OK if the information was retrieved
+ */
+err_t
+netconn_getaddr(struct netconn *conn, struct ip_addr *addr, u16_t *port, u8_t local)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_getaddr: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_getaddr: invalid addr", (addr != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_getaddr: invalid port", (port != NULL), return ERR_ARG;);
+
+ msg.function = do_getaddr;
+ msg.msg.conn = conn;
+ msg.msg.msg.ad.ipaddr = addr;
+ msg.msg.msg.ad.port = port;
+ msg.msg.msg.ad.local = local;
+ TCPIP_APIMSG(&msg);
+
+ return conn->err;
+}
+
+/**
+ * Bind a netconn to a specific local IP address and port.
+ * Binding one netconn twice might not always be checked correctly!
+ *
+ * @param conn the netconn to bind
+ * @param addr the local IP address to bind the netconn to (use IP_ADDR_ANY
+ * to bind to all addresses)
+ * @param port the local port to bind the netconn to (not used for RAW)
+ * @return ERR_OK if bound, any other err_t on failure
+ */
+err_t
+netconn_bind(struct netconn *conn, struct ip_addr *addr, u16_t port)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_bind: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_bind;
+ msg.msg.conn = conn;
+ msg.msg.msg.bc.ipaddr = addr;
+ msg.msg.msg.bc.port = port;
+ TCPIP_APIMSG(&msg);
+ return conn->err;
+}
+
+/**
+ * Connect a netconn to a specific remote IP address and port.
+ *
+ * @param conn the netconn to connect
+ * @param addr the remote IP address to connect to
+ * @param port the remote port to connect to (no used for RAW)
+ * @return ERR_OK if connected, return value of tcp_/udp_/raw_connect otherwise
+ */
+err_t
+netconn_connect(struct netconn *conn, struct ip_addr *addr, u16_t port)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_connect: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_connect;
+ msg.msg.conn = conn;
+ msg.msg.msg.bc.ipaddr = addr;
+ msg.msg.msg.bc.port = port;
+ /* This is the only function which need to not block tcpip_thread */
+ tcpip_apimsg(&msg);
+ return conn->err;
+}
+
+/**
+ * Disconnect a netconn from its current peer (only valid for UDP netconns).
+ *
+ * @param conn the netconn to disconnect
+ * @return TODO: return value is not set here...
+ */
+err_t
+netconn_disconnect(struct netconn *conn)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_disconnect: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_disconnect;
+ msg.msg.conn = conn;
+ TCPIP_APIMSG(&msg);
+ return conn->err;
+}
+
+/**
+ * Set a TCP netconn into listen mode
+ *
+ * @param conn the tcp netconn to set to listen mode
+ * @param backlog the listen backlog, only used if TCP_LISTEN_BACKLOG==1
+ * @return ERR_OK if the netconn was set to listen (UDP and RAW netconns
+ * don't return any error (yet?))
+ */
+err_t
+netconn_listen_with_backlog(struct netconn *conn, u8_t backlog)
+{
+ struct api_msg msg;
+
+ /* This does no harm. If TCP_LISTEN_BACKLOG is off, backlog is unused. */
+ LWIP_UNUSED_ARG(backlog);
+
+ LWIP_ERROR("netconn_listen: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_listen;
+ msg.msg.conn = conn;
+#if TCP_LISTEN_BACKLOG
+ msg.msg.msg.lb.backlog = backlog;
+#endif /* TCP_LISTEN_BACKLOG */
+ TCPIP_APIMSG(&msg);
+ return conn->err;
+}
+
+/**
+ * Accept a new connection on a TCP listening netconn.
+ *
+ * @param conn the TCP listen netconn
+ * @return the newly accepted netconn or NULL on timeout
+ */
+struct netconn *
+netconn_accept(struct netconn *conn)
+{
+ struct netconn *newconn;
+
+ LWIP_ERROR("netconn_accept: invalid conn", (conn != NULL), return NULL;);
+ LWIP_ERROR("netconn_accept: invalid acceptmbox", (conn->acceptmbox != SYS_MBOX_NULL), return NULL;);
+
+#if LWIP_SO_RCVTIMEO
+ if (sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, conn->recv_timeout) == SYS_ARCH_TIMEOUT) {
+ newconn = NULL;
+ } else
+#else
+ sys_arch_mbox_fetch(conn->acceptmbox, (void *)&newconn, 0);
+#endif /* LWIP_SO_RCVTIMEO*/
+ {
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVMINUS, 0);
+
+#if TCP_LISTEN_BACKLOG
+ if (newconn != NULL) {
+ /* Let the stack know that we have accepted the connection. */
+ struct api_msg msg;
+ msg.function = do_recv;
+ msg.msg.conn = conn;
+ TCPIP_APIMSG(&msg);
+ }
+#endif /* TCP_LISTEN_BACKLOG */
+ }
+
+ return newconn;
+}
+
+/**
+ * Receive data (in form of a netbuf containing a packet buffer) from a netconn
+ *
+ * @param conn the netconn from which to receive data
+ * @return a new netbuf containing received data or NULL on memory error or timeout
+ */
+struct netbuf *
+netconn_recv(struct netconn *conn)
+{
+ struct api_msg msg;
+ struct netbuf *buf = NULL;
+ struct pbuf *p;
+ u16_t len;
+
+ LWIP_ERROR("netconn_recv: invalid conn", (conn != NULL), return NULL;);
+
+ if (conn->recvmbox == SYS_MBOX_NULL) {
+ /* @todo: should calling netconn_recv on a TCP listen conn be fatal (ERR_CONN)?? */
+ /* TCP listen conns don't have a recvmbox! */
+ conn->err = ERR_CONN;
+ return NULL;
+ }
+
+ if (ERR_IS_FATAL(conn->err)) {
+ return NULL;
+ }
+
+ if (conn->type == NETCONN_TCP) {
+#if LWIP_TCP
+ if (conn->state == NETCONN_LISTEN) {
+ /* @todo: should calling netconn_recv on a TCP listen conn be fatal?? */
+ conn->err = ERR_CONN;
+ return NULL;
+ }
+
+ buf = memp_malloc(MEMP_NETBUF);
+
+ if (buf == NULL) {
+ conn->err = ERR_MEM;
+ return NULL;
+ }
+
+#if LWIP_SO_RCVTIMEO
+ if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
+ conn->err = ERR_TIMEOUT;
+ p = NULL;
+ }
+#else
+ sys_arch_mbox_fetch(conn->recvmbox, (void *)&p, 0);
+#endif /* LWIP_SO_RCVTIMEO*/
+
+ if (p != NULL) {
+ len = p->tot_len;
+ SYS_ARCH_DEC(conn->recv_avail, len);
+ } else {
+ len = 0;
+ }
+
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVMINUS, len);
+
+ /* If we are closed, we indicate that we no longer wish to use the socket */
+ if (p == NULL) {
+ memp_free(MEMP_NETBUF, buf);
+ /* Avoid to lose any previous error code */
+ if (conn->err == ERR_OK) {
+ conn->err = ERR_CLSD;
+ }
+ return NULL;
+ }
+
+ buf->p = p;
+ buf->ptr = p;
+ buf->port = 0;
+ buf->addr = NULL;
+
+ /* Let the stack know that we have taken the data. */
+ msg.function = do_recv;
+ msg.msg.conn = conn;
+ if (buf != NULL) {
+ msg.msg.msg.r.len = buf->p->tot_len;
+ } else {
+ msg.msg.msg.r.len = 1;
+ }
+ TCPIP_APIMSG(&msg);
+#endif /* LWIP_TCP */
+ } else {
+#if (LWIP_UDP || LWIP_RAW)
+#if LWIP_SO_RCVTIMEO
+ if (sys_arch_mbox_fetch(conn->recvmbox, (void *)&buf, conn->recv_timeout)==SYS_ARCH_TIMEOUT) {
+ buf = NULL;
+ }
+#else
+ sys_arch_mbox_fetch(conn->recvmbox, (void *)&buf, 0);
+#endif /* LWIP_SO_RCVTIMEO*/
+ if (buf!=NULL) {
+ SYS_ARCH_DEC(conn->recv_avail, buf->p->tot_len);
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVMINUS, buf->p->tot_len);
+ }
+#endif /* (LWIP_UDP || LWIP_RAW) */
+ }
+
+ LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_recv: received %p (err %d)\n", (void *)buf, conn->err));
+
+ return buf;
+}
+
+/**
+ * Send data (in form of a netbuf) to a specific remote IP address and port.
+ * Only to be used for UDP and RAW netconns (not TCP).
+ *
+ * @param conn the netconn over which to send data
+ * @param buf a netbuf containing the data to send
+ * @param addr the remote IP address to which to send the data
+ * @param port the remote port to which to send the data
+ * @return ERR_OK if data was sent, any other err_t on error
+ */
+err_t
+netconn_sendto(struct netconn *conn, struct netbuf *buf, struct ip_addr *addr, u16_t port)
+{
+ if (buf != NULL) {
+ buf->addr = addr;
+ buf->port = port;
+ return netconn_send(conn, buf);
+ }
+ return ERR_VAL;
+}
+
+/**
+ * Send data over a UDP or RAW netconn (that is already connected).
+ *
+ * @param conn the UDP or RAW netconn over which to send data
+ * @param buf a netbuf containing the data to send
+ * @return ERR_OK if data was sent, any other err_t on error
+ */
+err_t
+netconn_send(struct netconn *conn, struct netbuf *buf)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_send: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ LWIP_DEBUGF(API_LIB_DEBUG, ("netconn_send: sending %"U16_F" bytes\n", buf->p->tot_len));
+ msg.function = do_send;
+ msg.msg.conn = conn;
+ msg.msg.msg.b = buf;
+ TCPIP_APIMSG(&msg);
+ return conn->err;
+}
+
+/**
+ * Send data over a TCP netconn.
+ *
+ * @param conn the TCP netconn over which to send data
+ * @param dataptr pointer to the application buffer that contains the data to send
+ * @param size size of the application data to send
+ * @param apiflags combination of following flags :
+ * - NETCONN_COPY (0x01) data will be copied into memory belonging to the stack
+ * - NETCONN_MORE (0x02) for TCP connection, PSH flag will be set on last segment sent
+ * @return ERR_OK if data was sent, any other err_t on error
+ */
+err_t
+netconn_write(struct netconn *conn, const void *dataptr, size_t size, u8_t apiflags)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_write: invalid conn", (conn != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_write: invalid conn->type", (conn->type == NETCONN_TCP), return ERR_VAL;);
+
+ msg.function = do_write;
+ msg.msg.conn = conn;
+ msg.msg.msg.w.dataptr = dataptr;
+ msg.msg.msg.w.apiflags = apiflags;
+ msg.msg.msg.w.len = size;
+ /* For locking the core: this _can_ be delayed on low memory/low send buffer,
+ but if it is, this is done inside api_msg.c:do_write(), so we can use the
+ non-blocking version here. */
+ TCPIP_APIMSG(&msg);
+ return conn->err;
+}
+
+/**
+ * Close a TCP netconn (doesn't delete it).
+ *
+ * @param conn the TCP netconn to close
+ * @return ERR_OK if the netconn was closed, any other err_t on error
+ */
+err_t
+netconn_close(struct netconn *conn)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_close: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_close;
+ msg.msg.conn = conn;
+ tcpip_apimsg(&msg);
+ return conn->err;
+}
+
+#if LWIP_IGMP
+/**
+ * Join multicast groups for UDP netconns.
+ *
+ * @param conn the UDP netconn for which to change multicast addresses
+ * @param multiaddr IP address of the multicast group to join or leave
+ * @param interface the IP address of the network interface on which to send
+ * the igmp message
+ * @param join_or_leave flag whether to send a join- or leave-message
+ * @return ERR_OK if the action was taken, any err_t on error
+ */
+err_t
+netconn_join_leave_group(struct netconn *conn,
+ struct ip_addr *multiaddr,
+ struct ip_addr *interface,
+ enum netconn_igmp join_or_leave)
+{
+ struct api_msg msg;
+
+ LWIP_ERROR("netconn_join_leave_group: invalid conn", (conn != NULL), return ERR_ARG;);
+
+ msg.function = do_join_leave_group;
+ msg.msg.conn = conn;
+ msg.msg.msg.jl.multiaddr = multiaddr;
+ msg.msg.msg.jl.interface = interface;
+ msg.msg.msg.jl.join_or_leave = join_or_leave;
+ TCPIP_APIMSG(&msg);
+ return conn->err;
+}
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+/**
+ * Execute a DNS query, only one IP address is returned
+ *
+ * @param name a string representation of the DNS host name to query
+ * @param addr a preallocated struct ip_addr where to store the resolved IP address
+ * @return ERR_OK: resolving succeeded
+ * ERR_MEM: memory error, try again later
+ * ERR_ARG: dns client not initialized or invalid hostname
+ * ERR_VAL: dns server response was invalid
+ */
+err_t
+netconn_gethostbyname(const char *name, struct ip_addr *addr)
+{
+ struct dns_api_msg msg;
+ err_t err;
+ sys_sem_t sem;
+
+ LWIP_ERROR("netconn_gethostbyname: invalid name", (name != NULL), return ERR_ARG;);
+ LWIP_ERROR("netconn_gethostbyname: invalid addr", (addr != NULL), return ERR_ARG;);
+
+ sem = sys_sem_new(0);
+ if (sem == SYS_SEM_NULL) {
+ return ERR_MEM;
+ }
+
+ msg.name = name;
+ msg.addr = addr;
+ msg.err = &err;
+ msg.sem = sem;
+
+ tcpip_callback(do_gethostbyname, &msg);
+ sys_sem_wait(sem);
+ sys_sem_free(sem);
+
+ return err;
+}
+#endif /* LWIP_DNS*/
+
+#endif /* LWIP_NETCONN */
diff --git a/core/lwip/src/api/api_msg.c b/core/lwip/src/api/api_msg.c
new file mode 100644
index 00000000..28d10101
--- /dev/null
+++ b/core/lwip/src/api/api_msg.c
@@ -0,0 +1,1232 @@
+/**
+ * @file
+ * Sequential API Internal module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/api_msg.h"
+
+#include "lwip/ip.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/raw.h"
+
+#include "lwip/memp.h"
+#include "lwip/tcpip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+
+#include <string.h>
+
+/* forward declarations */
+#if LWIP_TCP
+static err_t do_writemore(struct netconn *conn);
+static void do_close_internal(struct netconn *conn);
+#endif
+
+#if LWIP_RAW
+/**
+ * Receive callback function for RAW netconns.
+ * Doesn't 'eat' the packet, only references it and sends it to
+ * conn->recvmbox
+ *
+ * @see raw.h (struct raw_pcb.recv) for parameters and return value
+ */
+static u8_t
+recv_raw(void *arg, struct raw_pcb *pcb, struct pbuf *p,
+ struct ip_addr *addr)
+{
+ struct pbuf *q;
+ struct netbuf *buf;
+ struct netconn *conn;
+#if LWIP_SO_RCVBUF
+ int recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+
+ LWIP_UNUSED_ARG(addr);
+ conn = arg;
+
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_GET(conn->recv_avail, recv_avail);
+ if ((conn != NULL) && (conn->recvmbox != SYS_MBOX_NULL) &&
+ ((recv_avail + (int)(p->tot_len)) <= conn->recv_bufsize)) {
+#else /* LWIP_SO_RCVBUF */
+ if ((conn != NULL) && (conn->recvmbox != SYS_MBOX_NULL)) {
+#endif /* LWIP_SO_RCVBUF */
+ /* copy the whole packet into new pbufs */
+ q = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
+ if(q != NULL) {
+ if (pbuf_copy(q, p) != ERR_OK) {
+ pbuf_free(q);
+ q = NULL;
+ }
+ }
+
+ if(q != NULL) {
+ buf = memp_malloc(MEMP_NETBUF);
+ if (buf == NULL) {
+ pbuf_free(q);
+ return 0;
+ }
+
+ buf->p = q;
+ buf->ptr = q;
+ buf->addr = &(((struct ip_hdr*)(q->payload))->src);
+ buf->port = pcb->protocol;
+
+ if (sys_mbox_trypost(conn->recvmbox, buf) != ERR_OK) {
+ netbuf_delete(buf);
+ return 0;
+ } else {
+ SYS_ARCH_INC(conn->recv_avail, q->tot_len);
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, q->tot_len);
+ }
+ }
+ }
+
+ return 0; /* do not eat the packet */
+}
+#endif /* LWIP_RAW*/
+
+#if LWIP_UDP
+/**
+ * Receive callback function for UDP netconns.
+ * Posts the packet to conn->recvmbox or deletes it on memory error.
+ *
+ * @see udp.h (struct udp_pcb.recv) for parameters
+ */
+static void
+recv_udp(void *arg, struct udp_pcb *pcb, struct pbuf *p,
+ struct ip_addr *addr, u16_t port)
+{
+ struct netbuf *buf;
+ struct netconn *conn;
+#if LWIP_SO_RCVBUF
+ int recv_avail;
+#endif /* LWIP_SO_RCVBUF */
+
+ LWIP_UNUSED_ARG(pcb); /* only used for asserts... */
+ LWIP_ASSERT("recv_udp must have a pcb argument", pcb != NULL);
+ LWIP_ASSERT("recv_udp must have an argument", arg != NULL);
+ conn = arg;
+ LWIP_ASSERT("recv_udp: recv for wrong pcb!", conn->pcb.udp == pcb);
+
+#if LWIP_SO_RCVBUF
+ SYS_ARCH_GET(conn->recv_avail, recv_avail);
+ if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL) ||
+ ((recv_avail + (int)(p->tot_len)) > conn->recv_bufsize)) {
+#else /* LWIP_SO_RCVBUF */
+ if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL)) {
+#endif /* LWIP_SO_RCVBUF */
+ pbuf_free(p);
+ return;
+ }
+
+ buf = memp_malloc(MEMP_NETBUF);
+ if (buf == NULL) {
+ pbuf_free(p);
+ return;
+ } else {
+ buf->p = p;
+ buf->ptr = p;
+ buf->addr = addr;
+ buf->port = port;
+ }
+
+ if (sys_mbox_trypost(conn->recvmbox, buf) != ERR_OK) {
+ netbuf_delete(buf);
+ return;
+ } else {
+ SYS_ARCH_INC(conn->recv_avail, p->tot_len);
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, p->tot_len);
+ }
+}
+#endif /* LWIP_UDP */
+
+#if LWIP_TCP
+/**
+ * Receive callback function for TCP netconns.
+ * Posts the packet to conn->recvmbox, but doesn't delete it on errors.
+ *
+ * @see tcp.h (struct tcp_pcb.recv) for parameters and return value
+ */
+static err_t
+recv_tcp(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err)
+{
+ struct netconn *conn;
+ u16_t len;
+
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_ASSERT("recv_tcp must have a pcb argument", pcb != NULL);
+ LWIP_ASSERT("recv_tcp must have an argument", arg != NULL);
+ conn = arg;
+ LWIP_ASSERT("recv_tcp: recv for wrong pcb!", conn->pcb.tcp == pcb);
+
+ if ((conn == NULL) || (conn->recvmbox == SYS_MBOX_NULL)) {
+ return ERR_VAL;
+ }
+
+ conn->err = err;
+ if (p != NULL) {
+ len = p->tot_len;
+ SYS_ARCH_INC(conn->recv_avail, len);
+ } else {
+ len = 0;
+ }
+
+ if (sys_mbox_trypost(conn->recvmbox, p) != ERR_OK) {
+ return ERR_MEM;
+ } else {
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, len);
+ }
+
+ return ERR_OK;
+}
+
+/**
+ * Poll callback function for TCP netconns.
+ * Wakes up an application thread that waits for a connection to close
+ * or data to be sent. The application thread then takes the
+ * appropriate action to go on.
+ *
+ * Signals the conn->sem.
+ * netconn_close waits for conn->sem if closing failed.
+ *
+ * @see tcp.h (struct tcp_pcb.poll) for parameters and return value
+ */
+static err_t
+poll_tcp(void *arg, struct tcp_pcb *pcb)
+{
+ struct netconn *conn = arg;
+
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_ASSERT("conn != NULL", (conn != NULL));
+
+ if (conn->state == NETCONN_WRITE) {
+ do_writemore(conn);
+ } else if (conn->state == NETCONN_CLOSE) {
+ do_close_internal(conn);
+ }
+
+ return ERR_OK;
+}
+
+/**
+ * Sent callback function for TCP netconns.
+ * Signals the conn->sem and calls API_EVENT.
+ * netconn_write waits for conn->sem if send buffer is low.
+ *
+ * @see tcp.h (struct tcp_pcb.sent) for parameters and return value
+ */
+static err_t
+sent_tcp(void *arg, struct tcp_pcb *pcb, u16_t len)
+{
+ struct netconn *conn = arg;
+
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_ASSERT("conn != NULL", (conn != NULL));
+
+ if (conn->state == NETCONN_WRITE) {
+ LWIP_ASSERT("conn->pcb.tcp != NULL", conn->pcb.tcp != NULL);
+ do_writemore(conn);
+ } else if (conn->state == NETCONN_CLOSE) {
+ do_close_internal(conn);
+ }
+
+ if (conn) {
+ if ((conn->pcb.tcp != NULL) && (tcp_sndbuf(conn->pcb.tcp) > TCP_SNDLOWAT)) {
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, len);
+ }
+ }
+
+ return ERR_OK;
+}
+
+/**
+ * Error callback function for TCP netconns.
+ * Signals conn->sem, posts to all conn mboxes and calls API_EVENT.
+ * The application thread has then to decide what to do.
+ *
+ * @see tcp.h (struct tcp_pcb.err) for parameters
+ */
+static void
+err_tcp(void *arg, err_t err)
+{
+ struct netconn *conn;
+
+ conn = arg;
+ LWIP_ASSERT("conn != NULL", (conn != NULL));
+
+ conn->pcb.tcp = NULL;
+
+ conn->err = err;
+ if (conn->recvmbox != SYS_MBOX_NULL) {
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ sys_mbox_post(conn->recvmbox, NULL);
+ }
+ if (conn->op_completed != SYS_SEM_NULL && conn->state == NETCONN_CONNECT) {
+ conn->state = NETCONN_NONE;
+ sys_sem_signal(conn->op_completed);
+ }
+ if (conn->acceptmbox != SYS_MBOX_NULL) {
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ sys_mbox_post(conn->acceptmbox, NULL);
+ }
+ if ((conn->state == NETCONN_WRITE) || (conn->state == NETCONN_CLOSE)) {
+ /* calling do_writemore/do_close_internal is not necessary
+ since the pcb has already been deleted! */
+ conn->state = NETCONN_NONE;
+ /* wake up the waiting task */
+ sys_sem_signal(conn->op_completed);
+ }
+}
+
+/**
+ * Setup a tcp_pcb with the correct callback function pointers
+ * and their arguments.
+ *
+ * @param conn the TCP netconn to setup
+ */
+static void
+setup_tcp(struct netconn *conn)
+{
+ struct tcp_pcb *pcb;
+
+ pcb = conn->pcb.tcp;
+ tcp_arg(pcb, conn);
+ tcp_recv(pcb, recv_tcp);
+ tcp_sent(pcb, sent_tcp);
+ tcp_poll(pcb, poll_tcp, 4);
+ tcp_err(pcb, err_tcp);
+}
+
+/**
+ * Accept callback function for TCP netconns.
+ * Allocates a new netconn and posts that to conn->acceptmbox.
+ *
+ * @see tcp.h (struct tcp_pcb_listen.accept) for parameters and return value
+ */
+static err_t
+accept_function(void *arg, struct tcp_pcb *newpcb, err_t err)
+{
+ struct netconn *newconn;
+ struct netconn *conn;
+
+#if API_MSG_DEBUG
+#if TCP_DEBUG
+ tcp_debug_print_state(newpcb->state);
+#endif /* TCP_DEBUG */
+#endif /* API_MSG_DEBUG */
+ conn = (struct netconn *)arg;
+
+ LWIP_ERROR("accept_function: invalid conn->acceptmbox",
+ conn->acceptmbox != SYS_MBOX_NULL, return ERR_VAL;);
+
+ /* We have to set the callback here even though
+ * the new socket is unknown. conn->socket is marked as -1. */
+ newconn = netconn_alloc(conn->type, conn->callback);
+ if (newconn == NULL) {
+ return ERR_MEM;
+ }
+ newconn->pcb.tcp = newpcb;
+ setup_tcp(newconn);
+ newconn->err = err;
+
+ if (sys_mbox_trypost(conn->acceptmbox, newconn) != ERR_OK) {
+ /* When returning != ERR_OK, the connection is aborted in tcp_process(),
+ so do nothing here! */
+ newconn->pcb.tcp = NULL;
+ netconn_free(newconn);
+ return ERR_MEM;
+ } else {
+ /* Register event with callback */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ }
+
+ return ERR_OK;
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Create a new pcb of a specific type.
+ * Called from do_newconn().
+ *
+ * @param msg the api_msg_msg describing the connection type
+ * @return msg->conn->err, but the return value is currently ignored
+ */
+static err_t
+pcb_new(struct api_msg_msg *msg)
+{
+ msg->conn->err = ERR_OK;
+
+ LWIP_ASSERT("pcb_new: pcb already allocated", msg->conn->pcb.tcp == NULL);
+
+ /* Allocate a PCB for this connection */
+ switch(NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ msg->conn->pcb.raw = raw_new(msg->msg.n.proto);
+ if(msg->conn->pcb.raw == NULL) {
+ msg->conn->err = ERR_MEM;
+ break;
+ }
+ raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->conn->pcb.udp = udp_new();
+ if(msg->conn->pcb.udp == NULL) {
+ msg->conn->err = ERR_MEM;
+ break;
+ }
+#if LWIP_UDPLITE
+ if (msg->conn->type==NETCONN_UDPLITE) {
+ udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_UDPLITE);
+ }
+#endif /* LWIP_UDPLITE */
+ if (msg->conn->type==NETCONN_UDPNOCHKSUM) {
+ udp_setflags(msg->conn->pcb.udp, UDP_FLAGS_NOCHKSUM);
+ }
+ udp_recv(msg->conn->pcb.udp, recv_udp, msg->conn);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ msg->conn->pcb.tcp = tcp_new();
+ if(msg->conn->pcb.tcp == NULL) {
+ msg->conn->err = ERR_MEM;
+ break;
+ }
+ setup_tcp(msg->conn);
+ break;
+#endif /* LWIP_TCP */
+ default:
+ /* Unsupported netconn type, e.g. protocol disabled */
+ msg->conn->err = ERR_VAL;
+ break;
+ }
+
+ return msg->conn->err;
+}
+
+/**
+ * Create a new pcb of a specific type inside a netconn.
+ * Called from netconn_new_with_proto_and_callback.
+ *
+ * @param msg the api_msg_msg describing the connection type
+ */
+void
+do_newconn(struct api_msg_msg *msg)
+{
+ if(msg->conn->pcb.tcp == NULL) {
+ pcb_new(msg);
+ }
+ /* Else? This "new" connection already has a PCB allocated. */
+ /* Is this an error condition? Should it be deleted? */
+ /* We currently just are happy and return. */
+
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Create a new netconn (of a specific type) that has a callback function.
+ * The corresponding pcb is NOT created!
+ *
+ * @param t the type of 'connection' to create (@see enum netconn_type)
+ * @param proto the IP protocol for RAW IP pcbs
+ * @param callback a function to call on status changes (RX available, TX'ed)
+ * @return a newly allocated struct netconn or
+ * NULL on memory error
+ */
+struct netconn*
+netconn_alloc(enum netconn_type t, netconn_callback callback)
+{
+ struct netconn *conn;
+ int size;
+
+ conn = memp_malloc(MEMP_NETCONN);
+ if (conn == NULL) {
+ return NULL;
+ }
+
+ conn->err = ERR_OK;
+ conn->type = t;
+ conn->pcb.tcp = NULL;
+
+#if (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_UDP_RECVMBOX_SIZE) && \
+ (DEFAULT_RAW_RECVMBOX_SIZE == DEFAULT_TCP_RECVMBOX_SIZE)
+ size = DEFAULT_RAW_RECVMBOX_SIZE;
+#else
+ switch(NETCONNTYPE_GROUP(t)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ size = DEFAULT_RAW_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ size = DEFAULT_UDP_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ size = DEFAULT_TCP_RECVMBOX_SIZE;
+ break;
+#endif /* LWIP_TCP */
+ default:
+ LWIP_ASSERT("netconn_alloc: undefined netconn_type", 0);
+ break;
+ }
+#endif
+
+ if ((conn->op_completed = sys_sem_new(0)) == SYS_SEM_NULL) {
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+ if ((conn->recvmbox = sys_mbox_new(size)) == SYS_MBOX_NULL) {
+ sys_sem_free(conn->op_completed);
+ memp_free(MEMP_NETCONN, conn);
+ return NULL;
+ }
+
+ conn->acceptmbox = SYS_MBOX_NULL;
+ conn->state = NETCONN_NONE;
+ /* initialize socket to -1 since 0 is a valid socket */
+ conn->socket = -1;
+ conn->callback = callback;
+ conn->recv_avail = 0;
+#if LWIP_TCP
+ conn->write_msg = NULL;
+ conn->write_offset = 0;
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->write_delayed = 0;
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_TCP */
+#if LWIP_SO_RCVTIMEO
+ conn->recv_timeout = 0;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ conn->recv_bufsize = RECV_BUFSIZE_DEFAULT;
+#endif /* LWIP_SO_RCVBUF */
+ return conn;
+}
+
+/**
+ * Delete a netconn and all its resources.
+ * The pcb is NOT freed (since we might not be in the right thread context do this).
+ *
+ * @param conn the netconn to free
+ */
+void
+netconn_free(struct netconn *conn)
+{
+ void *mem;
+ LWIP_ASSERT("PCB must be deallocated outside this function", conn->pcb.tcp == NULL);
+
+ /* Drain the recvmbox. */
+ if (conn->recvmbox != SYS_MBOX_NULL) {
+ while (sys_mbox_tryfetch(conn->recvmbox, &mem) != SYS_MBOX_EMPTY) {
+ if (conn->type == NETCONN_TCP) {
+ if(mem != NULL) {
+ pbuf_free((struct pbuf *)mem);
+ }
+ } else {
+ netbuf_delete((struct netbuf *)mem);
+ }
+ }
+ sys_mbox_free(conn->recvmbox);
+ conn->recvmbox = SYS_MBOX_NULL;
+ }
+
+ /* Drain the acceptmbox. */
+ if (conn->acceptmbox != SYS_MBOX_NULL) {
+ while (sys_mbox_tryfetch(conn->acceptmbox, &mem) != SYS_MBOX_EMPTY) {
+ netconn_delete((struct netconn *)mem);
+ }
+ sys_mbox_free(conn->acceptmbox);
+ conn->acceptmbox = SYS_MBOX_NULL;
+ }
+
+ sys_sem_free(conn->op_completed);
+ conn->op_completed = SYS_SEM_NULL;
+
+ memp_free(MEMP_NETCONN, conn);
+}
+
+#if LWIP_TCP
+/**
+ * Internal helper function to close a TCP netconn: since this sometimes
+ * doesn't work at the first attempt, this function is called from multiple
+ * places.
+ *
+ * @param conn the TCP netconn to close
+ */
+static void
+do_close_internal(struct netconn *conn)
+{
+ err_t err;
+
+ LWIP_ASSERT("invalid conn", (conn != NULL));
+ LWIP_ASSERT("this is for tcp netconns only", (conn->type == NETCONN_TCP));
+ LWIP_ASSERT("conn must be in state NETCONN_CLOSE", (conn->state == NETCONN_CLOSE));
+ LWIP_ASSERT("pcb already closed", (conn->pcb.tcp != NULL));
+
+ /* Set back some callback pointers */
+ tcp_arg(conn->pcb.tcp, NULL);
+ if (conn->pcb.tcp->state == LISTEN) {
+ tcp_accept(conn->pcb.tcp, NULL);
+ } else {
+ tcp_recv(conn->pcb.tcp, NULL);
+ tcp_accept(conn->pcb.tcp, NULL);
+ /* some callbacks have to be reset if tcp_close is not successful */
+ tcp_sent(conn->pcb.tcp, NULL);
+ tcp_poll(conn->pcb.tcp, NULL, 4);
+ tcp_err(conn->pcb.tcp, NULL);
+ }
+ /* Try to close the connection */
+ err = tcp_close(conn->pcb.tcp);
+ if (err == ERR_OK) {
+ /* Closing succeeded */
+ conn->state = NETCONN_NONE;
+ /* Set back some callback pointers as conn is going away */
+ conn->pcb.tcp = NULL;
+ conn->err = ERR_OK;
+ /* Trigger select() in socket layer. This send should something else so the
+ errorfd is set, not the read and write fd! */
+ API_EVENT(conn, NETCONN_EVT_RCVPLUS, 0);
+ API_EVENT(conn, NETCONN_EVT_SENDPLUS, 0);
+ /* wake up the application task */
+ sys_sem_signal(conn->op_completed);
+ } else {
+ /* Closing failed, restore some of the callbacks */
+ /* Closing of listen pcb will never fail! */
+ LWIP_ASSERT("Closing a listen pcb may not fail!", (conn->pcb.tcp->state != LISTEN));
+ tcp_sent(conn->pcb.tcp, sent_tcp);
+ tcp_poll(conn->pcb.tcp, poll_tcp, 4);
+ tcp_err(conn->pcb.tcp, err_tcp);
+ tcp_arg(conn->pcb.tcp, conn);
+ }
+ /* If closing didn't succeed, we get called again either
+ from poll_tcp or from sent_tcp */
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Delete the pcb inside a netconn.
+ * Called from netconn_delete.
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_delconn(struct api_msg_msg *msg)
+{
+ if (msg->conn->pcb.tcp != NULL) {
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ raw_remove(msg->conn->pcb.raw);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->conn->pcb.udp->recv_arg = NULL;
+ udp_remove(msg->conn->pcb.udp);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ msg->conn->state = NETCONN_CLOSE;
+ do_close_internal(msg->conn);
+ /* API_EVENT is called inside do_close_internal, before releasing
+ the application thread, so we can return at this point! */
+ return;
+#endif /* LWIP_TCP */
+ default:
+ break;
+ }
+ }
+ /* tcp netconns don't come here! */
+
+ /* Trigger select() in socket layer. This send should something else so the
+ errorfd is set, not the read and write fd! */
+ API_EVENT(msg->conn, NETCONN_EVT_RCVPLUS, 0);
+ API_EVENT(msg->conn, NETCONN_EVT_SENDPLUS, 0);
+
+ if (msg->conn->op_completed != SYS_SEM_NULL) {
+ sys_sem_signal(msg->conn->op_completed);
+ }
+}
+
+/**
+ * Bind a pcb contained in a netconn
+ * Called from netconn_bind.
+ *
+ * @param msg the api_msg_msg pointing to the connection and containing
+ * the IP address and port to bind to
+ */
+void
+do_bind(struct api_msg_msg *msg)
+{
+ if (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ msg->conn->err = raw_bind(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->conn->err = udp_bind(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ msg->conn->err = tcp_bind(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port);
+ break;
+#endif /* LWIP_TCP */
+ default:
+ break;
+ }
+ } else {
+ /* msg->conn->pcb is NULL */
+ msg->conn->err = ERR_VAL;
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+#if LWIP_TCP
+/**
+ * TCP callback function if a connection (opened by tcp_connect/do_connect) has
+ * been established (or reset by the remote host).
+ *
+ * @see tcp.h (struct tcp_pcb.connected) for parameters and return values
+ */
+static err_t
+do_connected(void *arg, struct tcp_pcb *pcb, err_t err)
+{
+ struct netconn *conn;
+
+ LWIP_UNUSED_ARG(pcb);
+
+ conn = arg;
+
+ if (conn == NULL) {
+ return ERR_VAL;
+ }
+
+ conn->err = err;
+ if ((conn->type == NETCONN_TCP) && (err == ERR_OK)) {
+ setup_tcp(conn);
+ }
+ conn->state = NETCONN_NONE;
+ sys_sem_signal(conn->op_completed);
+ return ERR_OK;
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Connect a pcb contained inside a netconn
+ * Called from netconn_connect.
+ *
+ * @param msg the api_msg_msg pointing to the connection and containing
+ * the IP address and port to connect to
+ */
+void
+do_connect(struct api_msg_msg *msg)
+{
+ if (msg->conn->pcb.tcp == NULL) {
+ sys_sem_signal(msg->conn->op_completed);
+ return;
+ }
+
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ msg->conn->err = raw_connect(msg->conn->pcb.raw, msg->msg.bc.ipaddr);
+ sys_sem_signal(msg->conn->op_completed);
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ msg->conn->err = udp_connect(msg->conn->pcb.udp, msg->msg.bc.ipaddr, msg->msg.bc.port);
+ sys_sem_signal(msg->conn->op_completed);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ msg->conn->state = NETCONN_CONNECT;
+ setup_tcp(msg->conn);
+ msg->conn->err = tcp_connect(msg->conn->pcb.tcp, msg->msg.bc.ipaddr, msg->msg.bc.port,
+ do_connected);
+ /* sys_sem_signal() is called from do_connected (or err_tcp()),
+ * when the connection is established! */
+ break;
+#endif /* LWIP_TCP */
+ default:
+ break;
+ }
+}
+
+/**
+ * Connect a pcb contained inside a netconn
+ * Only used for UDP netconns.
+ * Called from netconn_disconnect.
+ *
+ * @param msg the api_msg_msg pointing to the connection to disconnect
+ */
+void
+do_disconnect(struct api_msg_msg *msg)
+{
+#if LWIP_UDP
+ if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
+ udp_disconnect(msg->conn->pcb.udp);
+ }
+#endif /* LWIP_UDP */
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Set a TCP pcb contained in a netconn into listen mode
+ * Called from netconn_listen.
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_listen(struct api_msg_msg *msg)
+{
+#if LWIP_TCP
+ if (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ if (msg->conn->type == NETCONN_TCP) {
+ if (msg->conn->pcb.tcp->state == CLOSED) {
+#if TCP_LISTEN_BACKLOG
+ struct tcp_pcb* lpcb = tcp_listen_with_backlog(msg->conn->pcb.tcp, msg->msg.lb.backlog);
+#else /* TCP_LISTEN_BACKLOG */
+ struct tcp_pcb* lpcb = tcp_listen(msg->conn->pcb.tcp);
+#endif /* TCP_LISTEN_BACKLOG */
+ if (lpcb == NULL) {
+ msg->conn->err = ERR_MEM;
+ } else {
+ /* delete the recvmbox and allocate the acceptmbox */
+ if (msg->conn->recvmbox != SYS_MBOX_NULL) {
+ /** @todo: should we drain the recvmbox here? */
+ sys_mbox_free(msg->conn->recvmbox);
+ msg->conn->recvmbox = SYS_MBOX_NULL;
+ }
+ if (msg->conn->acceptmbox == SYS_MBOX_NULL) {
+ if ((msg->conn->acceptmbox = sys_mbox_new(DEFAULT_ACCEPTMBOX_SIZE)) == SYS_MBOX_NULL) {
+ msg->conn->err = ERR_MEM;
+ }
+ }
+ if (msg->conn->err == ERR_OK) {
+ msg->conn->state = NETCONN_LISTEN;
+ msg->conn->pcb.tcp = lpcb;
+ tcp_arg(msg->conn->pcb.tcp, msg->conn);
+ tcp_accept(msg->conn->pcb.tcp, accept_function);
+ }
+ }
+ } else {
+ msg->conn->err = ERR_CONN;
+ }
+ }
+ }
+ }
+#endif /* LWIP_TCP */
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Send some data on a RAW or UDP pcb contained in a netconn
+ * Called from netconn_send
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_send(struct api_msg_msg *msg)
+{
+ if (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ if (msg->msg.b->addr == NULL) {
+ msg->conn->err = raw_send(msg->conn->pcb.raw, msg->msg.b->p);
+ } else {
+ msg->conn->err = raw_sendto(msg->conn->pcb.raw, msg->msg.b->p, msg->msg.b->addr);
+ }
+ break;
+#endif
+#if LWIP_UDP
+ case NETCONN_UDP:
+ if (msg->msg.b->addr == NULL) {
+ msg->conn->err = udp_send(msg->conn->pcb.udp, msg->msg.b->p);
+ } else {
+ msg->conn->err = udp_sendto(msg->conn->pcb.udp, msg->msg.b->p, msg->msg.b->addr, msg->msg.b->port);
+ }
+ break;
+#endif /* LWIP_UDP */
+ default:
+ break;
+ }
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Indicate data has been received from a TCP pcb contained in a netconn
+ * Called from netconn_recv
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_recv(struct api_msg_msg *msg)
+{
+#if LWIP_TCP
+ if (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ if (msg->conn->type == NETCONN_TCP) {
+#if TCP_LISTEN_BACKLOG
+ if (msg->conn->pcb.tcp->state == LISTEN) {
+ tcp_accepted(msg->conn->pcb.tcp);
+ } else
+#endif /* TCP_LISTEN_BACKLOG */
+ {
+ tcp_recved(msg->conn->pcb.tcp, msg->msg.r.len);
+ }
+ }
+ }
+ }
+#endif /* LWIP_TCP */
+ TCPIP_APIMSG_ACK(msg);
+}
+
+#if LWIP_TCP
+/**
+ * See if more data needs to be written from a previous call to netconn_write.
+ * Called initially from do_write. If the first call can't send all data
+ * (because of low memory or empty send-buffer), this function is called again
+ * from sent_tcp() or poll_tcp() to send more data. If all data is sent, the
+ * blocking application thread (waiting in netconn_write) is released.
+ *
+ * @param conn netconn (that is currently in state NETCONN_WRITE) to process
+ * @return ERR_OK
+ * ERR_MEM if LWIP_TCPIP_CORE_LOCKING=1 and sending hasn't yet finished
+ */
+static err_t
+do_writemore(struct netconn *conn)
+{
+ err_t err;
+ void *dataptr;
+ u16_t len, available;
+ u8_t write_finished = 0;
+ size_t diff;
+
+ LWIP_ASSERT("conn->state == NETCONN_WRITE", (conn->state == NETCONN_WRITE));
+
+ dataptr = (u8_t*)conn->write_msg->msg.w.dataptr + conn->write_offset;
+ diff = conn->write_msg->msg.w.len - conn->write_offset;
+ if (diff > 0xffffUL) { /* max_u16_t */
+ len = 0xffff;
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->write_delayed = 1;
+#endif
+ } else {
+ len = (u16_t)diff;
+ }
+ available = tcp_sndbuf(conn->pcb.tcp);
+ if (available < len) {
+ /* don't try to write more than sendbuf */
+ len = available;
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->write_delayed = 1;
+#endif
+ }
+
+ err = tcp_write(conn->pcb.tcp, dataptr, len, conn->write_msg->msg.w.apiflags);
+ LWIP_ASSERT("do_writemore: invalid length!", ((conn->write_offset + len) <= conn->write_msg->msg.w.len));
+ if (err == ERR_OK) {
+ conn->write_offset += len;
+ if (conn->write_offset == conn->write_msg->msg.w.len) {
+ /* everything was written */
+ write_finished = 1;
+ conn->write_msg = NULL;
+ conn->write_offset = 0;
+ /* API_EVENT might call tcp_tmr, so reset conn->state now */
+ conn->state = NETCONN_NONE;
+ }
+ err = tcp_output_nagle(conn->pcb.tcp);
+ conn->err = err;
+ if ((err == ERR_OK) && (tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT)) {
+ API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
+ }
+ } else if (err == ERR_MEM) {
+ /* If ERR_MEM, we wait for sent_tcp or poll_tcp to be called
+ we do NOT return to the application thread, since ERR_MEM is
+ only a temporary error! */
+
+ /* tcp_enqueue returned ERR_MEM, try tcp_output anyway */
+ err = tcp_output(conn->pcb.tcp);
+
+#if LWIP_TCPIP_CORE_LOCKING
+ conn->write_delayed = 1;
+#endif
+ } else {
+ /* On errors != ERR_MEM, we don't try writing any more but return
+ the error to the application thread. */
+ conn->err = err;
+ write_finished = 1;
+ }
+
+ if (write_finished) {
+ /* everything was written: set back connection state
+ and back to application task */
+ conn->state = NETCONN_NONE;
+#if LWIP_TCPIP_CORE_LOCKING
+ if (conn->write_delayed != 0)
+#endif
+ {
+ sys_sem_signal(conn->op_completed);
+ }
+ }
+#if LWIP_TCPIP_CORE_LOCKING
+ else
+ return ERR_MEM;
+#endif
+ return ERR_OK;
+}
+#endif /* LWIP_TCP */
+
+/**
+ * Send some data on a TCP pcb contained in a netconn
+ * Called from netconn_write
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_write(struct api_msg_msg *msg)
+{
+ if (!ERR_IS_FATAL(msg->conn->err)) {
+ if ((msg->conn->pcb.tcp != NULL) && (msg->conn->type == NETCONN_TCP)) {
+#if LWIP_TCP
+ msg->conn->state = NETCONN_WRITE;
+ /* set all the variables used by do_writemore */
+ LWIP_ASSERT("already writing", msg->conn->write_msg == NULL &&
+ msg->conn->write_offset == 0);
+ msg->conn->write_msg = msg;
+ msg->conn->write_offset = 0;
+#if LWIP_TCPIP_CORE_LOCKING
+ msg->conn->write_delayed = 0;
+ if (do_writemore(msg->conn) != ERR_OK) {
+ LWIP_ASSERT("state!", msg->conn->state == NETCONN_WRITE);
+ UNLOCK_TCPIP_CORE();
+ sys_arch_sem_wait(msg->conn->op_completed, 0);
+ LOCK_TCPIP_CORE();
+ LWIP_ASSERT("state!", msg->conn->state == NETCONN_NONE);
+ }
+#else
+ do_writemore(msg->conn);
+#endif
+ /* for both cases: if do_writemore was called, don't ACK the APIMSG! */
+ return;
+#endif /* LWIP_TCP */
+#if (LWIP_UDP || LWIP_RAW)
+ } else {
+ msg->conn->err = ERR_VAL;
+#endif /* (LWIP_UDP || LWIP_RAW) */
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Return a connection's local or remote address
+ * Called from netconn_getaddr
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_getaddr(struct api_msg_msg *msg)
+{
+ if (msg->conn->pcb.ip != NULL) {
+ *(msg->msg.ad.ipaddr) = (msg->msg.ad.local?msg->conn->pcb.ip->local_ip:msg->conn->pcb.ip->remote_ip);
+
+ switch (NETCONNTYPE_GROUP(msg->conn->type)) {
+#if LWIP_RAW
+ case NETCONN_RAW:
+ if (msg->msg.ad.local) {
+ *(msg->msg.ad.port) = msg->conn->pcb.raw->protocol;
+ } else {
+ /* return an error as connecting is only a helper for upper layers */
+ msg->conn->err = ERR_CONN;
+ }
+ break;
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ case NETCONN_UDP:
+ if (msg->msg.ad.local) {
+ *(msg->msg.ad.port) = msg->conn->pcb.udp->local_port;
+ } else {
+ if ((msg->conn->pcb.udp->flags & UDP_FLAGS_CONNECTED) == 0) {
+ msg->conn->err = ERR_CONN;
+ } else {
+ *(msg->msg.ad.port) = msg->conn->pcb.udp->remote_port;
+ }
+ }
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case NETCONN_TCP:
+ *(msg->msg.ad.port) = (msg->msg.ad.local?msg->conn->pcb.tcp->local_port:msg->conn->pcb.tcp->remote_port);
+ break;
+#endif /* LWIP_TCP */
+ }
+ } else {
+ msg->conn->err = ERR_CONN;
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+
+/**
+ * Close a TCP pcb contained in a netconn
+ * Called from netconn_close
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_close(struct api_msg_msg *msg)
+{
+#if LWIP_TCP
+ if ((msg->conn->pcb.tcp != NULL) && (msg->conn->type == NETCONN_TCP)) {
+ msg->conn->state = NETCONN_CLOSE;
+ do_close_internal(msg->conn);
+ /* for tcp netconns, do_close_internal ACKs the message */
+ } else
+#endif /* LWIP_TCP */
+ {
+ msg->conn->err = ERR_VAL;
+ TCPIP_APIMSG_ACK(msg);
+ }
+}
+
+#if LWIP_IGMP
+/**
+ * Join multicast groups for UDP netconns.
+ * Called from netconn_join_leave_group
+ *
+ * @param msg the api_msg_msg pointing to the connection
+ */
+void
+do_join_leave_group(struct api_msg_msg *msg)
+{
+ if (!ERR_IS_FATAL(msg->conn->err)) {
+ if (msg->conn->pcb.tcp != NULL) {
+ if (NETCONNTYPE_GROUP(msg->conn->type) == NETCONN_UDP) {
+#if LWIP_UDP
+ if (msg->msg.jl.join_or_leave == NETCONN_JOIN) {
+ msg->conn->err = igmp_joingroup(msg->msg.jl.interface, msg->msg.jl.multiaddr);
+ } else {
+ msg->conn->err = igmp_leavegroup(msg->msg.jl.interface, msg->msg.jl.multiaddr);
+ }
+#endif /* LWIP_UDP */
+#if (LWIP_TCP || LWIP_RAW)
+ } else {
+ msg->conn->err = ERR_VAL;
+#endif /* (LWIP_TCP || LWIP_RAW) */
+ }
+ }
+ }
+ TCPIP_APIMSG_ACK(msg);
+}
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+/**
+ * Callback function that is called when DNS name is resolved
+ * (or on timeout). A waiting application thread is waked up by
+ * signaling the semaphore.
+ */
+static void
+do_dns_found(const char *name, struct ip_addr *ipaddr, void *arg)
+{
+ struct dns_api_msg *msg = (struct dns_api_msg*)arg;
+
+ LWIP_ASSERT("DNS response for wrong host name", strcmp(msg->name, name) == 0);
+
+ if (ipaddr == NULL) {
+ /* timeout or memory error */
+ *msg->err = ERR_VAL;
+ } else {
+ /* address was resolved */
+ *msg->err = ERR_OK;
+ *msg->addr = *ipaddr;
+ }
+ /* wake up the application task waiting in netconn_gethostbyname */
+ sys_sem_signal(msg->sem);
+}
+
+/**
+ * Execute a DNS query
+ * Called from netconn_gethostbyname
+ *
+ * @param arg the dns_api_msg pointing to the query
+ */
+void
+do_gethostbyname(void *arg)
+{
+ struct dns_api_msg *msg = (struct dns_api_msg*)arg;
+
+ *msg->err = dns_gethostbyname(msg->name, msg->addr, do_dns_found, msg);
+ if (*msg->err != ERR_INPROGRESS) {
+ /* on error or immediate success, wake up the application
+ * task waiting in netconn_gethostbyname */
+ sys_sem_signal(msg->sem);
+ }
+}
+#endif /* LWIP_DNS */
+
+#endif /* LWIP_NETCONN */
diff --git a/core/lwip/src/api/err.c b/core/lwip/src/api/err.c
new file mode 100644
index 00000000..a90cb98c
--- /dev/null
+++ b/core/lwip/src/api/err.c
@@ -0,0 +1,74 @@
+/**
+ * @file
+ * Error Management module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/err.h"
+
+#ifdef LWIP_DEBUG
+
+static const char *err_strerr[] = {
+ "Ok.", /* ERR_OK 0 */
+ "Out of memory error.", /* ERR_MEM -1 */
+ "Buffer error.", /* ERR_BUF -2 */
+ "Timeout.", /* ERR_TIMEOUT -3 */
+ "Routing problem.", /* ERR_RTE -4 */
+ "Connection aborted.", /* ERR_ABRT -5 */
+ "Connection reset.", /* ERR_RST -6 */
+ "Connection closed.", /* ERR_CLSD -7 */
+ "Not connected.", /* ERR_CONN -8 */
+ "Illegal value.", /* ERR_VAL -9 */
+ "Illegal argument.", /* ERR_ARG -10 */
+ "Address in use.", /* ERR_USE -11 */
+ "Low-level netif error.", /* ERR_IF -12 */
+ "Already connected.", /* ERR_ISCONN -13 */
+ "Operation in progress." /* ERR_INPROGRESS -14 */
+};
+
+/**
+ * Convert an lwip internal error to a string representation.
+ *
+ * @param err an lwip internal err_t
+ * @return a string representation for err
+ */
+const char *
+lwip_strerr(err_t err)
+{
+ return err_strerr[-err];
+
+}
+
+#endif /* LWIP_DEBUG */
diff --git a/core/lwip/src/api/netbuf.c b/core/lwip/src/api/netbuf.c
new file mode 100644
index 00000000..af44eefc
--- /dev/null
+++ b/core/lwip/src/api/netbuf.c
@@ -0,0 +1,235 @@
+/**
+ * @file
+ * Network buffer management
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETCONN /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netbuf.h"
+#include "lwip/memp.h"
+
+#include <string.h>
+
+/**
+ * Create (allocate) and initialize a new netbuf.
+ * The netbuf doesn't yet contain a packet buffer!
+ *
+ * @return a pointer to a new netbuf
+ * NULL on lack of memory
+ */
+struct
+netbuf *netbuf_new(void)
+{
+ struct netbuf *buf;
+
+ buf = memp_malloc(MEMP_NETBUF);
+ if (buf != NULL) {
+ buf->p = NULL;
+ buf->ptr = NULL;
+ buf->addr = NULL;
+ return buf;
+ } else {
+ return NULL;
+ }
+}
+
+/**
+ * Deallocate a netbuf allocated by netbuf_new().
+ *
+ * @param buf pointer to a netbuf allocated by netbuf_new()
+ */
+void
+netbuf_delete(struct netbuf *buf)
+{
+ if (buf != NULL) {
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ buf->p = buf->ptr = NULL;
+ }
+ memp_free(MEMP_NETBUF, buf);
+ }
+}
+
+/**
+ * Allocate memory for a packet buffer for a given netbuf.
+ *
+ * @param buf the netbuf for which to allocate a packet buffer
+ * @param size the size of the packet buffer to allocate
+ * @return pointer to the allocated memory
+ * NULL if no memory could be allocated
+ */
+void *
+netbuf_alloc(struct netbuf *buf, u16_t size)
+{
+ LWIP_ERROR("netbuf_alloc: invalid buf", (buf != NULL), return NULL;);
+
+ /* Deallocate any previously allocated memory. */
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ }
+ buf->p = pbuf_alloc(PBUF_TRANSPORT, size, PBUF_RAM);
+ if (buf->p == NULL) {
+ return NULL;
+ }
+ LWIP_ASSERT("check that first pbuf can hold size",
+ (buf->p->len >= size));
+ buf->ptr = buf->p;
+ return buf->p->payload;
+}
+
+/**
+ * Free the packet buffer included in a netbuf
+ *
+ * @param buf pointer to the netbuf which contains the packet buffer to free
+ */
+void
+netbuf_free(struct netbuf *buf)
+{
+ LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ }
+ buf->p = buf->ptr = NULL;
+}
+
+/**
+ * Let a netbuf reference existing (non-volatile) data.
+ *
+ * @param buf netbuf which should reference the data
+ * @param dataptr pointer to the data to reference
+ * @param size size of the data
+ * @return ERR_OK if data is referenced
+ * ERR_MEM if data couldn't be referenced due to lack of memory
+ */
+err_t
+netbuf_ref(struct netbuf *buf, const void *dataptr, u16_t size)
+{
+ LWIP_ERROR("netbuf_ref: invalid buf", (buf != NULL), return ERR_ARG;);
+ if (buf->p != NULL) {
+ pbuf_free(buf->p);
+ }
+ buf->p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
+ if (buf->p == NULL) {
+ buf->ptr = NULL;
+ return ERR_MEM;
+ }
+ buf->p->payload = (void*)dataptr;
+ buf->p->len = buf->p->tot_len = size;
+ buf->ptr = buf->p;
+ return ERR_OK;
+}
+
+/**
+ * Chain one netbuf to another (@see pbuf_chain)
+ *
+ * @param head the first netbuf
+ * @param tail netbuf to chain after head, freed by this function, may not be reference after returning
+ */
+void
+netbuf_chain(struct netbuf *head, struct netbuf *tail)
+{
+ LWIP_ERROR("netbuf_ref: invalid head", (head != NULL), return;);
+ LWIP_ERROR("netbuf_chain: invalid tail", (tail != NULL), return;);
+ pbuf_cat(head->p, tail->p);
+ head->ptr = head->p;
+ memp_free(MEMP_NETBUF, tail);
+}
+
+/**
+ * Get the data pointer and length of the data inside a netbuf.
+ *
+ * @param buf netbuf to get the data from
+ * @param dataptr pointer to a void pointer where to store the data pointer
+ * @param len pointer to an u16_t where the length of the data is stored
+ * @return ERR_OK if the information was retreived,
+ * ERR_BUF on error.
+ */
+err_t
+netbuf_data(struct netbuf *buf, void **dataptr, u16_t *len)
+{
+ LWIP_ERROR("netbuf_data: invalid buf", (buf != NULL), return ERR_ARG;);
+ LWIP_ERROR("netbuf_data: invalid dataptr", (dataptr != NULL), return ERR_ARG;);
+ LWIP_ERROR("netbuf_data: invalid len", (len != NULL), return ERR_ARG;);
+
+ if (buf->ptr == NULL) {
+ return ERR_BUF;
+ }
+ *dataptr = buf->ptr->payload;
+ *len = buf->ptr->len;
+ return ERR_OK;
+}
+
+/**
+ * Move the current data pointer of a packet buffer contained in a netbuf
+ * to the next part.
+ * The packet buffer itself is not modified.
+ *
+ * @param buf the netbuf to modify
+ * @return -1 if there is no next part
+ * 1 if moved to the next part but now there is no next part
+ * 0 if moved to the next part and there are still more parts
+ */
+s8_t
+netbuf_next(struct netbuf *buf)
+{
+ LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return -1;);
+ if (buf->ptr->next == NULL) {
+ return -1;
+ }
+ buf->ptr = buf->ptr->next;
+ if (buf->ptr->next == NULL) {
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Move the current data pointer of a packet buffer contained in a netbuf
+ * to the beginning of the packet.
+ * The packet buffer itself is not modified.
+ *
+ * @param buf the netbuf to modify
+ */
+void
+netbuf_first(struct netbuf *buf)
+{
+ LWIP_ERROR("netbuf_free: invalid buf", (buf != NULL), return;);
+ buf->ptr = buf->p;
+}
+
+#endif /* LWIP_NETCONN */
diff --git a/core/lwip/src/api/netdb.c b/core/lwip/src/api/netdb.c
new file mode 100644
index 00000000..8aa237f4
--- /dev/null
+++ b/core/lwip/src/api/netdb.c
@@ -0,0 +1,356 @@
+/**
+ * @file
+ * API functions for name resolving
+ *
+ */
+
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Simon Goldschmidt
+ *
+ */
+
+#include "lwip/netdb.h"
+
+#if LWIP_DNS && LWIP_SOCKET
+
+#include "lwip/err.h"
+#include "lwip/mem.h"
+#include "lwip/ip_addr.h"
+#include "lwip/api.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+/** helper struct for gethostbyname_r to access the char* buffer */
+struct gethostbyname_r_helper {
+ struct ip_addr *addrs;
+ struct ip_addr addr;
+ char *aliases;
+};
+
+/** h_errno is exported in netdb.h for access by applications. */
+#if LWIP_DNS_API_DECLARE_H_ERRNO
+int h_errno;
+#endif /* LWIP_DNS_API_DECLARE_H_ERRNO */
+
+/** define "hostent" variables storage: 0 if we use a static (but unprotected)
+ * set of variables for lwip_gethostbyname, 1 if we use a local storage */
+#ifndef LWIP_DNS_API_HOSTENT_STORAGE
+#define LWIP_DNS_API_HOSTENT_STORAGE 0
+#endif
+
+/** define "hostent" variables storage */
+#if LWIP_DNS_API_HOSTENT_STORAGE
+#define HOSTENT_STORAGE
+#else
+#define HOSTENT_STORAGE static
+#endif /* LWIP_DNS_API_STATIC_HOSTENT */
+
+/**
+ * Returns an entry containing addresses of address family AF_INET
+ * for the host with name name.
+ * Due to dns_gethostbyname limitations, only one address is returned.
+ *
+ * @param name the hostname to resolve
+ * @return an entry containing addresses of address family AF_INET
+ * for the host with name name
+ */
+struct hostent*
+lwip_gethostbyname(const char *name)
+{
+ err_t err;
+ struct ip_addr addr;
+
+ /* buffer variables for lwip_gethostbyname() */
+ HOSTENT_STORAGE struct hostent s_hostent;
+ HOSTENT_STORAGE char *s_aliases;
+ HOSTENT_STORAGE struct ip_addr s_hostent_addr;
+ HOSTENT_STORAGE struct ip_addr *s_phostent_addr;
+
+ /* query host IP address */
+ err = netconn_gethostbyname(name, &addr);
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
+ h_errno = HOST_NOT_FOUND;
+ return NULL;
+ }
+
+ /* fill hostent */
+ s_hostent_addr = addr;
+ s_phostent_addr = &s_hostent_addr;
+ s_hostent.h_name = (char*)name;
+ s_hostent.h_aliases = &s_aliases;
+ s_hostent.h_addrtype = AF_INET;
+ s_hostent.h_length = sizeof(struct ip_addr);
+ s_hostent.h_addr_list = (char**)&s_phostent_addr;
+
+#if DNS_DEBUG
+ /* dump hostent */
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_name == %s\n", s_hostent.h_name));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases == %p\n", s_hostent.h_aliases));
+ if (s_hostent.h_aliases != NULL) {
+ u8_t idx;
+ for ( idx=0; s_hostent.h_aliases[idx]; idx++) {
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %p\n", idx, s_hostent.h_aliases[idx]));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_aliases[%i]-> == %s\n", idx, s_hostent.h_aliases[idx]));
+ }
+ }
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addrtype == %d\n", s_hostent.h_addrtype));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_length == %d\n", s_hostent.h_length));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list == %p\n", s_hostent.h_addr_list));
+ if (s_hostent.h_addr_list != NULL) {
+ u8_t idx;
+ for ( idx=0; s_hostent.h_addr_list[idx]; idx++) {
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i] == %p\n", idx, s_hostent.h_addr_list[idx]));
+ LWIP_DEBUGF(DNS_DEBUG, ("hostent.h_addr_list[%i]-> == %s\n", idx, inet_ntoa(*((struct in_addr*)(s_hostent.h_addr_list[idx])))));
+ }
+ }
+#endif /* DNS_DEBUG */
+
+#if LWIP_DNS_API_HOSTENT_STORAGE
+ /* this function should return the "per-thread" hostent after copy from s_hostent */
+ return sys_thread_hostent(&s_hostent);
+#else
+ return &s_hostent;
+#endif /* LWIP_DNS_API_HOSTENT_STORAGE */
+}
+
+/**
+ * Thread-safe variant of lwip_gethostbyname: instead of using a static
+ * buffer, this function takes buffer and errno pointers as arguments
+ * and uses these for the result.
+ *
+ * @param name the hostname to resolve
+ * @param ret pre-allocated struct where to store the result
+ * @param buf pre-allocated buffer where to store additional data
+ * @param buflen the size of buf
+ * @param result pointer to a hostent pointer that is set to ret on success
+ * and set to zero on error
+ * @param h_errnop pointer to an int where to store errors (instead of modifying
+ * the global h_errno)
+ * @return 0 on success, non-zero on error, additional error information
+ * is stored in *h_errnop instead of h_errno to be thread-safe
+ */
+int
+lwip_gethostbyname_r(const char *name, struct hostent *ret, char *buf,
+ size_t buflen, struct hostent **result, int *h_errnop)
+{
+ err_t err;
+ struct gethostbyname_r_helper *h;
+ char *hostname;
+ size_t namelen;
+ int lh_errno;
+
+ if (h_errnop == NULL) {
+ /* ensure h_errnop is never NULL */
+ h_errnop = &lh_errno;
+ }
+
+ if (result == NULL) {
+ /* not all arguments given */
+ *h_errnop = EINVAL;
+ return -1;
+ }
+ /* first thing to do: set *result to nothing */
+ *result = NULL;
+ if ((name == NULL) || (ret == NULL) || (buf == 0)) {
+ /* not all arguments given */
+ *h_errnop = EINVAL;
+ return -1;
+ }
+
+ namelen = strlen(name);
+ if (buflen < (sizeof(struct gethostbyname_r_helper) + namelen + 1 + (MEM_ALIGNMENT - 1))) {
+ /* buf can't hold the data needed + a copy of name */
+ *h_errnop = ERANGE;
+ return -1;
+ }
+
+ h = (struct gethostbyname_r_helper*)LWIP_MEM_ALIGN(buf);
+ hostname = ((char*)h) + sizeof(struct gethostbyname_r_helper);
+
+ /* query host IP address */
+ err = netconn_gethostbyname(name, &(h->addr));
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(DNS_DEBUG, ("lwip_gethostbyname(%s) failed, err=%d\n", name, err));
+ *h_errnop = ENSRNOTFOUND;
+ return -1;
+ }
+
+ /* copy the hostname into buf */
+ MEMCPY(hostname, name, namelen);
+ hostname[namelen] = 0;
+
+ /* fill hostent */
+ h->addrs = &(h->addr);
+ h->aliases = NULL;
+ ret->h_name = (char*)hostname;
+ ret->h_aliases = &(h->aliases);
+ ret->h_addrtype = AF_INET;
+ ret->h_length = sizeof(struct ip_addr);
+ ret->h_addr_list = (char**)&(h->addrs);
+
+ /* set result != NULL */
+ *result = ret;
+
+ /* return success */
+ return 0;
+}
+
+/**
+ * Frees one or more addrinfo structures returned by getaddrinfo(), along with
+ * any additional storage associated with those structures. If the ai_next field
+ * of the structure is not null, the entire list of structures is freed.
+ *
+ * @param ai struct addrinfo to free
+ */
+void
+lwip_freeaddrinfo(struct addrinfo *ai)
+{
+ struct addrinfo *next;
+
+ while (ai != NULL) {
+ if (ai->ai_addr != NULL) {
+ mem_free(ai->ai_addr);
+ }
+ if (ai->ai_canonname != NULL) {
+ mem_free(ai->ai_canonname);
+ }
+ next = ai->ai_next;
+ mem_free(ai);
+ ai = next;
+ }
+}
+
+/**
+ * Translates the name of a service location (for example, a host name) and/or
+ * a service name and returns a set of socket addresses and associated
+ * information to be used in creating a socket with which to address the
+ * specified service.
+ * Memory for the result is allocated internally and must be freed by calling
+ * lwip_freeaddrinfo()!
+ *
+ * Due to a limitation in dns_gethostbyname, only the first address of a
+ * host is returned.
+ * Also, service names are not supported (only port numbers)!
+ *
+ * @param nodename descriptive name or address string of the host
+ * (may be NULL -> local address)
+ * @param servname port number as string of NULL
+ * @param hints structure containing input values that set socktype and protocol
+ * @param res pointer to a pointer where to store the result (set to NULL on failure)
+ * @return 0 on success, non-zero on failure
+ */
+int
+lwip_getaddrinfo(const char *nodename, const char *servname,
+ const struct addrinfo *hints, struct addrinfo **res)
+{
+ err_t err;
+ struct ip_addr addr;
+ struct addrinfo *ai;
+ struct sockaddr_in *sa = NULL;
+ int port_nr = 0;
+
+ if (res == NULL) {
+ return EAI_FAIL;
+ }
+ *res = NULL;
+ if ((nodename == NULL) && (servname == NULL)) {
+ return EAI_NONAME;
+ }
+
+ if (servname != NULL) {
+ /* service name specified: convert to port number
+ * @todo?: currently, only ASCII integers (port numbers) are supported! */
+ port_nr = atoi(servname);
+ if ((port_nr <= 0) || (port_nr > 0xffff)) {
+ return EAI_SERVICE;
+ }
+ }
+
+ if (nodename != NULL) {
+ /* service location specified, try to resolve */
+ err = netconn_gethostbyname(nodename, &addr);
+ if (err != ERR_OK) {
+ return EAI_FAIL;
+ }
+ } else {
+ /* service location specified, use loopback address */
+ addr.addr = INADDR_LOOPBACK;
+ }
+
+ ai = mem_malloc(sizeof(struct addrinfo));
+ if (ai == NULL) {
+ goto memerr;
+ }
+ memset(ai, 0, sizeof(struct addrinfo));
+ sa = mem_malloc(sizeof(struct sockaddr_in));
+ if (sa == NULL) {
+ goto memerr;
+ }
+ memset(sa, 0, sizeof(struct sockaddr_in));
+ /* set up sockaddr */
+ sa->sin_addr.s_addr = addr.addr;
+ sa->sin_family = AF_INET;
+ sa->sin_len = sizeof(struct sockaddr_in);
+ sa->sin_port = htons(port_nr);
+
+ /* set up addrinfo */
+ ai->ai_family = AF_INET;
+ if (hints != NULL) {
+ /* copy socktype & protocol from hints if specified */
+ ai->ai_socktype = hints->ai_socktype;
+ ai->ai_protocol = hints->ai_protocol;
+ }
+ if (nodename != NULL) {
+ /* copy nodename to canonname if specified */
+ size_t namelen = strlen(nodename);
+ LWIP_ASSERT("namelen is too long", (namelen + 1) <= (mem_size_t)-1);
+ ai->ai_canonname = mem_malloc((mem_size_t)(namelen + 1));
+ if (ai->ai_canonname == NULL) {
+ goto memerr;
+ }
+ MEMCPY(ai->ai_canonname, nodename, namelen);
+ ai->ai_canonname[namelen] = 0;
+ }
+ ai->ai_addrlen = sizeof(struct sockaddr_in);
+ ai->ai_addr = (struct sockaddr*)sa;
+
+ *res = ai;
+
+ return 0;
+memerr:
+ if (ai != NULL) {
+ mem_free(ai);
+ }
+ if (sa != NULL) {
+ mem_free(sa);
+ }
+ return EAI_MEMORY;
+}
+
+#endif /* LWIP_DNS && LWIP_SOCKET */
diff --git a/core/lwip/src/api/netifapi.c b/core/lwip/src/api/netifapi.c
new file mode 100644
index 00000000..49183737
--- /dev/null
+++ b/core/lwip/src/api/netifapi.c
@@ -0,0 +1,126 @@
+/**
+ * @file
+ * Network Interface Sequential API module
+ *
+ */
+
+/*
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_NETIF_API /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netifapi.h"
+#include "lwip/tcpip.h"
+
+/**
+ * Call netif_add() inside the tcpip_thread context.
+ */
+void
+do_netifapi_netif_add( struct netifapi_msg_msg *msg)
+{
+ if (!netif_add( msg->netif,
+ msg->msg.add.ipaddr,
+ msg->msg.add.netmask,
+ msg->msg.add.gw,
+ msg->msg.add.state,
+ msg->msg.add.init,
+ msg->msg.add.input)) {
+ msg->err = ERR_IF;
+ } else {
+ msg->err = ERR_OK;
+ }
+ TCPIP_NETIFAPI_ACK(msg);
+}
+
+/**
+ * Call the "errtfunc" (or the "voidfunc" if "errtfunc" is NULL) inside the
+ * tcpip_thread context.
+ */
+void
+do_netifapi_netif_common( struct netifapi_msg_msg *msg)
+{
+ if (msg->msg.common.errtfunc!=NULL) {
+ msg->err =
+ msg->msg.common.errtfunc(msg->netif);
+ } else {
+ msg->err = ERR_OK;
+ msg->msg.common.voidfunc(msg->netif);
+ }
+ TCPIP_NETIFAPI_ACK(msg);
+}
+
+/**
+ * Call netif_add() in a thread-safe way by running that function inside the
+ * tcpip_thread context.
+ *
+ * @note for params @see netif_add()
+ */
+err_t
+netifapi_netif_add(struct netif *netif,
+ struct ip_addr *ipaddr,
+ struct ip_addr *netmask,
+ struct ip_addr *gw,
+ void *state,
+ err_t (* init)(struct netif *netif),
+ err_t (* input)(struct pbuf *p, struct netif *netif))
+{
+ struct netifapi_msg msg;
+ msg.function = do_netifapi_netif_add;
+ msg.msg.netif = netif;
+ msg.msg.msg.add.ipaddr = ipaddr;
+ msg.msg.msg.add.netmask = netmask;
+ msg.msg.msg.add.gw = gw;
+ msg.msg.msg.add.state = state;
+ msg.msg.msg.add.init = init;
+ msg.msg.msg.add.input = input;
+ TCPIP_NETIFAPI(&msg);
+ return msg.msg.err;
+}
+
+/**
+ * call the "errtfunc" (or the "voidfunc" if "errtfunc" is NULL) in a thread-safe
+ * way by running that function inside the tcpip_thread context.
+ *
+ * @note use only for functions where there is only "netif" parameter.
+ */
+err_t
+netifapi_netif_common( struct netif *netif,
+ void (* voidfunc)(struct netif *netif),
+ err_t (* errtfunc)(struct netif *netif) )
+{
+ struct netifapi_msg msg;
+ msg.function = do_netifapi_netif_common;
+ msg.msg.netif = netif;
+ msg.msg.msg.common.voidfunc = voidfunc;
+ msg.msg.msg.common.errtfunc = errtfunc;
+ TCPIP_NETIFAPI(&msg);
+ return msg.msg.err;
+}
+
+#endif /* LWIP_NETIF_API */
diff --git a/core/lwip/src/api/sockets.c b/core/lwip/src/api/sockets.c
new file mode 100644
index 00000000..f177261e
--- /dev/null
+++ b/core/lwip/src/api/sockets.c
@@ -0,0 +1,1970 @@
+/**
+ * @file
+ * Sockets BSD-Like API module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * Improved by Marc Boucher <marc@mbsi.ca> and David Haas <dhaas@alum.rpi.edu>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/sockets.h"
+#include "lwip/api.h"
+#include "lwip/sys.h"
+#include "lwip/igmp.h"
+#include "lwip/inet.h"
+#include "lwip/tcp.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcpip.h"
+
+#include <string.h>
+
+#define NUM_SOCKETS MEMP_NUM_NETCONN
+
+/** Contains all internal pointers and states used for a socket */
+struct lwip_socket {
+ /** sockets currently are built on netconns, each socket has one netconn */
+ struct netconn *conn;
+ /** data that was left from the previous read */
+ struct netbuf *lastdata;
+ /** offset in the data that was left from the previous read */
+ u16_t lastoffset;
+ /** number of times data was received, set by event_callback(),
+ tested by the receive and select functions */
+ s16_t rcvevent;
+ /** number of times data was received, set by event_callback(),
+ tested by select */
+ u16_t sendevent;
+ /** socket flags (currently, only used for O_NONBLOCK) */
+ u16_t flags;
+ /** last error that occurred on this socket */
+ int err;
+};
+
+/** Description for a task waiting in select */
+struct lwip_select_cb {
+ /** Pointer to the next waiting task */
+ struct lwip_select_cb *next;
+ /** readset passed to select */
+ fd_set *readset;
+ /** writeset passed to select */
+ fd_set *writeset;
+ /** unimplemented: exceptset passed to select */
+ fd_set *exceptset;
+ /** don't signal the same semaphore twice: set to 1 when signalled */
+ int sem_signalled;
+ /** semaphore to wake up a task waiting for select */
+ sys_sem_t sem;
+};
+
+/** This struct is used to pass data to the set/getsockopt_internal
+ * functions running in tcpip_thread context (only a void* is allowed) */
+struct lwip_setgetsockopt_data {
+ /** socket struct for which to change options */
+ struct lwip_socket *sock;
+ /** socket index for which to change options */
+ int s;
+ /** level of the option to process */
+ int level;
+ /** name of the option to process */
+ int optname;
+ /** set: value to set the option to
+ * get: value of the option is stored here */
+ void *optval;
+ /** size of *optval */
+ socklen_t *optlen;
+ /** if an error occures, it is temporarily stored here */
+ err_t err;
+};
+
+/** The global array of available sockets */
+static struct lwip_socket sockets[NUM_SOCKETS];
+/** The global list of tasks waiting for select */
+static struct lwip_select_cb *select_cb_list;
+
+/** Semaphore protecting the sockets array */
+static sys_sem_t socksem;
+/** Semaphore protecting select_cb_list */
+static sys_sem_t selectsem;
+
+/** Table to quickly map an lwIP error (err_t) to a socket error
+ * by using -err as an index */
+static const int err_to_errno_table[] = {
+ 0, /* ERR_OK 0 No error, everything OK. */
+ ENOMEM, /* ERR_MEM -1 Out of memory error. */
+ ENOBUFS, /* ERR_BUF -2 Buffer error. */
+ ETIMEDOUT, /* ERR_TIMEOUT -3 Timeout */
+ EHOSTUNREACH, /* ERR_RTE -4 Routing problem. */
+ ECONNABORTED, /* ERR_ABRT -5 Connection aborted. */
+ ECONNRESET, /* ERR_RST -6 Connection reset. */
+ ESHUTDOWN, /* ERR_CLSD -7 Connection closed. */
+ ENOTCONN, /* ERR_CONN -8 Not connected. */
+ EINVAL, /* ERR_VAL -9 Illegal value. */
+ EIO, /* ERR_ARG -10 Illegal argument. */
+ EADDRINUSE, /* ERR_USE -11 Address in use. */
+ -1, /* ERR_IF -12 Low-level netif error */
+ -1, /* ERR_ISCONN -13 Already connected. */
+ EINPROGRESS /* ERR_INPROGRESS -14 Operation in progress */
+};
+
+#define ERR_TO_ERRNO_TABLE_SIZE \
+ (sizeof(err_to_errno_table)/sizeof(err_to_errno_table[0]))
+
+#define err_to_errno(err) \
+ ((unsigned)(-(err)) < ERR_TO_ERRNO_TABLE_SIZE ? \
+ err_to_errno_table[-(err)] : EIO)
+
+#ifdef ERRNO
+#ifndef set_errno
+#define set_errno(err) errno = (err)
+#endif
+#else
+#define set_errno(err)
+#endif
+
+#define sock_set_errno(sk, e) do { \
+ sk->err = (e); \
+ set_errno(sk->err); \
+} while (0)
+
+/* Forward delcaration of some functions */
+static void event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len);
+static void lwip_getsockopt_internal(void *arg);
+static void lwip_setsockopt_internal(void *arg);
+
+/**
+ * Initialize this module. This function has to be called before any other
+ * functions in this module!
+ */
+void
+lwip_socket_init(void)
+{
+ socksem = sys_sem_new(1);
+ selectsem = sys_sem_new(1);
+}
+
+/**
+ * Map a externally used socket index to the internal socket representation.
+ *
+ * @param s externally used socket index
+ * @return struct lwip_socket for the socket or NULL if not found
+ */
+static struct lwip_socket *
+get_socket(int s)
+{
+ struct lwip_socket *sock;
+
+ if ((s < 0) || (s >= NUM_SOCKETS)) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): invalid\n", s));
+ set_errno(EBADF);
+ return NULL;
+ }
+
+ sock = &sockets[s];
+
+ if (!sock->conn) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): not active\n", s));
+ set_errno(EBADF);
+ return NULL;
+ }
+
+ return sock;
+}
+
+/**
+ * Allocate a new socket for a given netconn.
+ *
+ * @param newconn the netconn for which to allocate a socket
+ * @return the index of the new socket; -1 on error
+ */
+static int
+alloc_socket(struct netconn *newconn)
+{
+ int i;
+
+ /* Protect socket array */
+ sys_sem_wait(socksem);
+
+ /* allocate a new socket identifier */
+ for (i = 0; i < NUM_SOCKETS; ++i) {
+ if (!sockets[i].conn) {
+ sockets[i].conn = newconn;
+ sockets[i].lastdata = NULL;
+ sockets[i].lastoffset = 0;
+ sockets[i].rcvevent = 0;
+ sockets[i].sendevent = 1; /* TCP send buf is empty */
+ sockets[i].flags = 0;
+ sockets[i].err = 0;
+ sys_sem_signal(socksem);
+ return i;
+ }
+ }
+ sys_sem_signal(socksem);
+ return -1;
+}
+
+/* Below this, the well-known socket functions are implemented.
+ * Use google.com or opengroup.org to get a good description :-)
+ *
+ * Exceptions are documented!
+ */
+
+int
+lwip_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
+{
+ struct lwip_socket *sock, *nsock;
+ struct netconn *newconn;
+ struct ip_addr naddr;
+ u16_t port;
+ int newsock;
+ struct sockaddr_in sin;
+ err_t err;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d)...\n", s));
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ if ((sock->flags & O_NONBLOCK) && (sock->rcvevent <= 0)) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): returning EWOULDBLOCK\n", s));
+ sock_set_errno(sock, EWOULDBLOCK);
+ return -1;
+ }
+
+ newconn = netconn_accept(sock->conn);
+ if (!newconn) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) failed, err=%d\n", s, sock->conn->err));
+ sock_set_errno(sock, err_to_errno(sock->conn->err));
+ return -1;
+ }
+
+ /* get the IP address and port of the remote host */
+ err = netconn_peer(newconn, &naddr, &port);
+ if (err != ERR_OK) {
+ netconn_delete(newconn);
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ /* Note that POSIX only requires us to check addr is non-NULL. addrlen must
+ * not be NULL if addr is valid.
+ */
+ if (NULL != addr) {
+ LWIP_ASSERT("addr valid but addrlen NULL", addrlen != NULL);
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_len = sizeof(sin);
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ sin.sin_addr.s_addr = naddr.addr;
+
+ if (*addrlen > sizeof(sin))
+ *addrlen = sizeof(sin);
+
+ MEMCPY(addr, &sin, *addrlen);
+ }
+
+ newsock = alloc_socket(newconn);
+ if (newsock == -1) {
+ netconn_delete(newconn);
+ sock_set_errno(sock, ENFILE);
+ return -1;
+ }
+ LWIP_ASSERT("invalid socket index", (newsock >= 0) && (newsock < NUM_SOCKETS));
+ newconn->callback = event_callback;
+ nsock = &sockets[newsock];
+ LWIP_ASSERT("invalid socket pointer", nsock != NULL);
+
+ sys_sem_wait(socksem);
+ /* See event_callback: If data comes in right away after an accept, even
+ * though the server task might not have created a new socket yet.
+ * In that case, newconn->socket is counted down (newconn->socket--),
+ * so nsock->rcvevent is >= 1 here!
+ */
+ nsock->rcvevent += -1 - newconn->socket;
+ newconn->socket = newsock;
+ sys_sem_signal(socksem);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) returning new sock=%d addr=", s, newsock));
+ ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", port));
+
+ sock_set_errno(sock, 0);
+ return newsock;
+}
+
+int
+lwip_bind(int s, const struct sockaddr *name, socklen_t namelen)
+{
+ struct lwip_socket *sock;
+ struct ip_addr local_addr;
+ u16_t local_port;
+ err_t err;
+
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ LWIP_ERROR("lwip_bind: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
+ ((((const struct sockaddr_in *)name)->sin_family) == AF_INET)),
+ sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
+
+ local_addr.addr = ((const struct sockaddr_in *)name)->sin_addr.s_addr;
+ local_port = ((const struct sockaddr_in *)name)->sin_port;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d, addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, &local_addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(local_port)));
+
+ err = netconn_bind(sock->conn, &local_addr, ntohs(local_port));
+
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) succeeded\n", s));
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+int
+lwip_close(int s)
+{
+ struct lwip_socket *sock;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_close(%d)\n", s));
+
+ sock = get_socket(s);
+ if (!sock) {
+ return -1;
+ }
+
+ netconn_delete(sock->conn);
+
+ sys_sem_wait(socksem);
+ if (sock->lastdata) {
+ netbuf_delete(sock->lastdata);
+ }
+ sock->lastdata = NULL;
+ sock->lastoffset = 0;
+ sock->conn = NULL;
+ sock_set_errno(sock, 0);
+ sys_sem_signal(socksem);
+ return 0;
+}
+
+int
+lwip_connect(int s, const struct sockaddr *name, socklen_t namelen)
+{
+ struct lwip_socket *sock;
+ err_t err;
+
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ LWIP_ERROR("lwip_connect: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
+ ((((const struct sockaddr_in *)name)->sin_family) == AF_INET)),
+ sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
+
+ if (((const struct sockaddr_in *)name)->sin_family == AF_UNSPEC) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, AF_UNSPEC)\n", s));
+ err = netconn_disconnect(sock->conn);
+ } else {
+ struct ip_addr remote_addr;
+ u16_t remote_port;
+
+ remote_addr.addr = ((const struct sockaddr_in *)name)->sin_addr.s_addr;
+ remote_port = ((const struct sockaddr_in *)name)->sin_port;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(remote_port)));
+
+ err = netconn_connect(sock->conn, &remote_addr, ntohs(remote_port));
+ }
+
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) succeeded\n", s));
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+/**
+ * Set a socket into listen mode.
+ * The socket may not have been used for another connection previously.
+ *
+ * @param s the socket to set to listening mode
+ * @param backlog (ATTENTION: need TCP_LISTEN_BACKLOG=1)
+ * @return 0 on success, non-zero on failure
+ */
+int
+lwip_listen(int s, int backlog)
+{
+ struct lwip_socket *sock;
+ err_t err;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d, backlog=%d)\n", s, backlog));
+
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ /* limit the "backlog" parameter to fit in an u8_t */
+ if (backlog < 0) {
+ backlog = 0;
+ }
+ if (backlog > 0xff) {
+ backlog = 0xff;
+ }
+
+ err = netconn_listen_with_backlog(sock->conn, backlog);
+
+ if (err != ERR_OK) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d) failed, err=%d\n", s, err));
+ sock_set_errno(sock, err_to_errno(err));
+ return -1;
+ }
+
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+int
+lwip_recvfrom(int s, void *mem, size_t len, int flags,
+ struct sockaddr *from, socklen_t *fromlen)
+{
+ struct lwip_socket *sock;
+ struct netbuf *buf;
+ u16_t buflen, copylen, off = 0;
+ struct ip_addr *addr;
+ u16_t port;
+ u8_t done = 0;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d, %p, %"SZT_F", 0x%x, ..)\n", s, mem, len, flags));
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ do {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: top while sock->lastdata=%p\n", (void*)sock->lastdata));
+ /* Check if there is data left from the last recv operation. */
+ if (sock->lastdata) {
+ buf = sock->lastdata;
+ } else {
+ /* If this is non-blocking call, then check first */
+ if (((flags & MSG_DONTWAIT) || (sock->flags & O_NONBLOCK)) &&
+ (sock->rcvevent <= 0)) {
+ if (off > 0) {
+ /* already received data, return that */
+ sock_set_errno(sock, 0);
+ return off;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): returning EWOULDBLOCK\n", s));
+ sock_set_errno(sock, EWOULDBLOCK);
+ return -1;
+ }
+
+ /* No data was left from the previous operation, so we try to get
+ some from the network. */
+ sock->lastdata = buf = netconn_recv(sock->conn);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: netconn_recv netbuf=%p\n", (void*)buf));
+
+ if (!buf) {
+ if (off > 0) {
+ /* already received data, return that */
+ sock_set_errno(sock, 0);
+ return off;
+ }
+ /* We should really do some error checking here. */
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): buf == NULL!\n", s));
+ sock_set_errno(sock, (((sock->conn->pcb.ip != NULL) && (sock->conn->err == ERR_OK))
+ ? ETIMEDOUT : err_to_errno(sock->conn->err)));
+ return 0;
+ }
+ }
+
+ buflen = netbuf_len(buf);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: buflen=%"U16_F" len=%"SZT_F" off=%"U16_F" sock->lastoffset=%"U16_F"\n",
+ buflen, len, off, sock->lastoffset));
+
+ buflen -= sock->lastoffset;
+
+ if (len > buflen) {
+ copylen = buflen;
+ } else {
+ copylen = (u16_t)len;
+ }
+
+ /* copy the contents of the received buffer into
+ the supplied memory pointer mem */
+ netbuf_copy_partial(buf, (u8_t*)mem + off, copylen, sock->lastoffset);
+
+ off += copylen;
+
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ LWIP_ASSERT("invalid copylen, len would underflow", len >= copylen);
+ len -= copylen;
+ if ( (len <= 0) ||
+ (buf->p->flags & PBUF_FLAG_PUSH) ||
+ (sock->rcvevent <= 0) ||
+ ((flags & MSG_PEEK)!=0)) {
+ done = 1;
+ }
+ } else {
+ done = 1;
+ }
+
+ /* Check to see from where the data was.*/
+ if (done) {
+ if (from && fromlen) {
+ struct sockaddr_in sin;
+
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ addr = (struct ip_addr*)&(sin.sin_addr.s_addr);
+ netconn_getaddr(sock->conn, addr, &port, 0);
+ } else {
+ addr = netbuf_fromaddr(buf);
+ port = netbuf_fromport(buf);
+ }
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_len = sizeof(sin);
+ sin.sin_family = AF_INET;
+ sin.sin_port = htons(port);
+ sin.sin_addr.s_addr = addr->addr;
+
+ if (*fromlen > sizeof(sin)) {
+ *fromlen = sizeof(sin);
+ }
+
+ MEMCPY(from, &sin, *fromlen);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%"U16_F"\n", port, off));
+ } else {
+ #if SOCKETS_DEBUG
+ struct sockaddr_in sin;
+
+ if (netconn_type(sock->conn) == NETCONN_TCP) {
+ addr = (struct ip_addr*)&(sin.sin_addr.s_addr);
+ netconn_getaddr(sock->conn, addr, &port, 0);
+ } else {
+ addr = netbuf_fromaddr(buf);
+ port = netbuf_fromport(buf);
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%"U16_F"\n", port, off));
+ #endif /* SOCKETS_DEBUG */
+ }
+ }
+
+ /* If we don't peek the incoming message... */
+ if ((flags & MSG_PEEK)==0) {
+ /* If this is a TCP socket, check if there is data left in the
+ buffer. If so, it should be saved in the sock structure for next
+ time around. */
+ if ((netconn_type(sock->conn) == NETCONN_TCP) && (buflen - copylen > 0)) {
+ sock->lastdata = buf;
+ sock->lastoffset += copylen;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: lastdata now netbuf=%p\n", (void*)buf));
+ } else {
+ sock->lastdata = NULL;
+ sock->lastoffset = 0;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: deleting netbuf=%p\n", (void*)buf));
+ netbuf_delete(buf);
+ }
+ }
+ } while (!done);
+
+ sock_set_errno(sock, 0);
+ return off;
+}
+
+int
+lwip_read(int s, void *mem, size_t len)
+{
+ return lwip_recvfrom(s, mem, len, 0, NULL, NULL);
+}
+
+int
+lwip_recv(int s, void *mem, size_t len, int flags)
+{
+ return lwip_recvfrom(s, mem, len, flags, NULL, NULL);
+}
+
+int
+lwip_send(int s, const void *data, size_t size, int flags)
+{
+ struct lwip_socket *sock;
+ err_t err;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d, data=%p, size=%"SZT_F", flags=0x%x)\n",
+ s, data, size, flags));
+
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ if (sock->conn->type != NETCONN_TCP) {
+#if (LWIP_UDP || LWIP_RAW)
+ return lwip_sendto(s, data, size, flags, NULL, 0);
+#else
+ sock_set_errno(sock, err_to_errno(ERR_ARG));
+ return -1;
+#endif /* (LWIP_UDP || LWIP_RAW) */
+ }
+
+ err = netconn_write(sock->conn, data, size, NETCONN_COPY | ((flags & MSG_MORE)?NETCONN_MORE:0));
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d size=%"SZT_F"\n", s, err, size));
+ sock_set_errno(sock, err_to_errno(err));
+ return (err == ERR_OK ? (int)size : -1);
+}
+
+int
+lwip_sendto(int s, const void *data, size_t size, int flags,
+ const struct sockaddr *to, socklen_t tolen)
+{
+ struct lwip_socket *sock;
+ struct ip_addr remote_addr;
+ err_t err;
+ u16_t short_size;
+#if !LWIP_TCPIP_CORE_LOCKING
+ struct netbuf buf;
+ u16_t remote_port;
+#endif
+
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ if (sock->conn->type == NETCONN_TCP) {
+#if LWIP_TCP
+ return lwip_send(s, data, size, flags);
+#else
+ sock_set_errno(sock, err_to_errno(ERR_ARG));
+ return -1;
+#endif /* LWIP_TCP */
+ }
+
+ LWIP_ASSERT("lwip_sendto: size must fit in u16_t", size <= 0xffff);
+ short_size = (u16_t)size;
+ LWIP_ERROR("lwip_sendto: invalid address", (((to == NULL) && (tolen == 0)) ||
+ ((tolen == sizeof(struct sockaddr_in)) &&
+ ((((const struct sockaddr_in *)to)->sin_family) == AF_INET))),
+ sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);
+
+#if LWIP_TCPIP_CORE_LOCKING
+ /* Should only be consider like a sample or a simple way to experiment this option (no check of "to" field...) */
+ { struct pbuf* p;
+
+ p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);
+ if (p == NULL) {
+ err = ERR_MEM;
+ } else {
+ p->payload = (void*)data;
+ p->len = p->tot_len = short_size;
+
+ remote_addr.addr = ((const struct sockaddr_in *)to)->sin_addr.s_addr;
+
+ LOCK_TCPIP_CORE();
+ if (sock->conn->type==NETCONN_RAW) {
+ err = sock->conn->err = raw_sendto(sock->conn->pcb.raw, p, &remote_addr);
+ } else {
+ err = sock->conn->err = udp_sendto(sock->conn->pcb.udp, p, &remote_addr, ntohs(((const struct sockaddr_in *)to)->sin_port));
+ }
+ UNLOCK_TCPIP_CORE();
+
+ pbuf_free(p);
+ }
+ }
+#else
+ /* initialize a buffer */
+ buf.p = buf.ptr = NULL;
+ if (to) {
+ remote_addr.addr = ((const struct sockaddr_in *)to)->sin_addr.s_addr;
+ remote_port = ntohs(((const struct sockaddr_in *)to)->sin_port);
+ buf.addr = &remote_addr;
+ buf.port = remote_port;
+ } else {
+ remote_addr.addr = 0;
+ remote_port = 0;
+ buf.addr = NULL;
+ buf.port = 0;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_sendto(%d, data=%p, short_size=%d"U16_F", flags=0x%x to=",
+ s, data, short_size, flags));
+ ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", remote_port));
+
+ /* make the buffer point to the data that should be sent */
+#if LWIP_NETIF_TX_SINGLE_PBUF
+ /* Allocate a new netbuf and copy the data into it. */
+ if (netbuf_alloc(&buf, short_size) == NULL) {
+ err = ERR_MEM;
+ } else {
+ err = netbuf_take(&buf, data, short_size);
+ }
+#else /* LWIP_NETIF_TX_SINGLE_PBUF */
+ err = netbuf_ref(&buf, data, short_size);
+#endif /* LWIP_NETIF_TX_SINGLE_PBUF */
+ if (err == ERR_OK) {
+ /* send the data */
+ err = netconn_send(sock->conn, &buf);
+ }
+
+ /* deallocated the buffer */
+ netbuf_free(&buf);
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+ sock_set_errno(sock, err_to_errno(err));
+ return (err == ERR_OK ? short_size : -1);
+}
+
+int
+lwip_socket(int domain, int type, int protocol)
+{
+ struct netconn *conn;
+ int i;
+
+ LWIP_UNUSED_ARG(domain);
+
+ /* create a netconn */
+ switch (type) {
+ case SOCK_RAW:
+ conn = netconn_new_with_proto_and_callback(NETCONN_RAW, (u8_t)protocol, event_callback);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_RAW, %d) = ",
+ domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
+ break;
+ case SOCK_DGRAM:
+ conn = netconn_new_with_callback( (protocol == IPPROTO_UDPLITE) ?
+ NETCONN_UDPLITE : NETCONN_UDP, event_callback);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_DGRAM, %d) = ",
+ domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
+ break;
+ case SOCK_STREAM:
+ conn = netconn_new_with_callback(NETCONN_TCP, event_callback);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_STREAM, %d) = ",
+ domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
+ break;
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%d, %d/UNKNOWN, %d) = -1\n",
+ domain, type, protocol));
+ set_errno(EINVAL);
+ return -1;
+ }
+
+ if (!conn) {
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("-1 / ENOBUFS (could not create netconn)\n"));
+ set_errno(ENOBUFS);
+ return -1;
+ }
+
+ i = alloc_socket(conn);
+
+ if (i == -1) {
+ netconn_delete(conn);
+ set_errno(ENFILE);
+ return -1;
+ }
+ conn->socket = i;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("%d\n", i));
+ set_errno(0);
+ return i;
+}
+
+int
+lwip_write(int s, const void *data, size_t size)
+{
+ return lwip_send(s, data, size, 0);
+}
+
+/**
+ * Go through the readset and writeset lists and see which socket of the sockets
+ * set in the sets has events. On return, readset, writeset and exceptset have
+ * the sockets enabled that had events.
+ *
+ * exceptset is not used for now!!!
+ *
+ * @param maxfdp1 the highest socket index in the sets
+ * @param readset in: set of sockets to check for read events;
+ * out: set of sockets that had read events
+ * @param writeset in: set of sockets to check for write events;
+ * out: set of sockets that had write events
+ * @param exceptset not yet implemented
+ * @return number of sockets that had events (read+write)
+ */
+static int
+lwip_selscan(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset)
+{
+ int i, nready = 0;
+ fd_set lreadset, lwriteset, lexceptset;
+ struct lwip_socket *p_sock;
+
+ FD_ZERO(&lreadset);
+ FD_ZERO(&lwriteset);
+ FD_ZERO(&lexceptset);
+
+ /* Go through each socket in each list to count number of sockets which
+ currently match */
+ for(i = 0; i < maxfdp1; i++) {
+ if (FD_ISSET(i, readset)) {
+ /* See if netconn of this socket is ready for read */
+ p_sock = get_socket(i);
+ if (p_sock && (p_sock->lastdata || (p_sock->rcvevent > 0))) {
+ FD_SET(i, &lreadset);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for reading\n", i));
+ nready++;
+ }
+ }
+ if (FD_ISSET(i, writeset)) {
+ /* See if netconn of this socket is ready for write */
+ p_sock = get_socket(i);
+ if (p_sock && p_sock->sendevent) {
+ FD_SET(i, &lwriteset);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for writing\n", i));
+ nready++;
+ }
+ }
+ }
+ *readset = lreadset;
+ *writeset = lwriteset;
+ FD_ZERO(exceptset);
+
+ return nready;
+}
+
+
+/**
+ * Processing exceptset is not yet implemented.
+ */
+int
+lwip_select(int maxfdp1, fd_set *readset, fd_set *writeset, fd_set *exceptset,
+ struct timeval *timeout)
+{
+ int i;
+ int nready;
+ fd_set lreadset, lwriteset, lexceptset;
+ u32_t msectimeout;
+ struct lwip_select_cb select_cb;
+ struct lwip_select_cb *p_selcb;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select(%d, %p, %p, %p, tvsec=%ld tvusec=%ld)\n",
+ maxfdp1, (void *)readset, (void *) writeset, (void *) exceptset,
+ timeout ? (long)timeout->tv_sec : (long)-1,
+ timeout ? (long)timeout->tv_usec : (long)-1));
+
+ select_cb.next = 0;
+ select_cb.readset = readset;
+ select_cb.writeset = writeset;
+ select_cb.exceptset = exceptset;
+ select_cb.sem_signalled = 0;
+
+ /* Protect ourselves searching through the list */
+ sys_sem_wait(selectsem);
+
+ if (readset)
+ lreadset = *readset;
+ else
+ FD_ZERO(&lreadset);
+ if (writeset)
+ lwriteset = *writeset;
+ else
+ FD_ZERO(&lwriteset);
+ if (exceptset)
+ lexceptset = *exceptset;
+ else
+ FD_ZERO(&lexceptset);
+
+ /* Go through each socket in each list to count number of sockets which
+ currently match */
+ nready = lwip_selscan(maxfdp1, &lreadset, &lwriteset, &lexceptset);
+
+ /* If we don't have any current events, then suspend if we are supposed to */
+ if (!nready) {
+ if (timeout && timeout->tv_sec == 0 && timeout->tv_usec == 0) {
+ sys_sem_signal(selectsem);
+ if (readset)
+ FD_ZERO(readset);
+ if (writeset)
+ FD_ZERO(writeset);
+ if (exceptset)
+ FD_ZERO(exceptset);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: no timeout, returning 0\n"));
+ set_errno(0);
+
+ return 0;
+ }
+
+ /* add our semaphore to list */
+ /* We don't actually need any dynamic memory. Our entry on the
+ * list is only valid while we are in this function, so it's ok
+ * to use local variables */
+
+ select_cb.sem = sys_sem_new(0);
+ /* Note that we are still protected */
+ /* Put this select_cb on top of list */
+ select_cb.next = select_cb_list;
+ select_cb_list = &select_cb;
+
+ /* Now we can safely unprotect */
+ sys_sem_signal(selectsem);
+
+ /* Now just wait to be woken */
+ if (timeout == 0)
+ /* Wait forever */
+ msectimeout = 0;
+ else {
+ msectimeout = ((timeout->tv_sec * 1000) + ((timeout->tv_usec + 500)/1000));
+ if(msectimeout == 0)
+ msectimeout = 1;
+ }
+
+ i = sys_sem_wait_timeout(select_cb.sem, msectimeout);
+
+ /* Take us off the list */
+ sys_sem_wait(selectsem);
+ if (select_cb_list == &select_cb)
+ select_cb_list = select_cb.next;
+ else
+ for (p_selcb = select_cb_list; p_selcb; p_selcb = p_selcb->next) {
+ if (p_selcb->next == &select_cb) {
+ p_selcb->next = select_cb.next;
+ break;
+ }
+ }
+
+ sys_sem_signal(selectsem);
+
+ sys_sem_free(select_cb.sem);
+ if (i == 0) {
+ /* Timeout */
+ if (readset)
+ FD_ZERO(readset);
+ if (writeset)
+ FD_ZERO(writeset);
+ if (exceptset)
+ FD_ZERO(exceptset);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: timeout expired\n"));
+ set_errno(0);
+
+ return 0;
+ }
+
+ if (readset)
+ lreadset = *readset;
+ else
+ FD_ZERO(&lreadset);
+ if (writeset)
+ lwriteset = *writeset;
+ else
+ FD_ZERO(&lwriteset);
+ if (exceptset)
+ lexceptset = *exceptset;
+ else
+ FD_ZERO(&lexceptset);
+
+ /* See what's set */
+ nready = lwip_selscan(maxfdp1, &lreadset, &lwriteset, &lexceptset);
+ } else
+ sys_sem_signal(selectsem);
+
+ if (readset)
+ *readset = lreadset;
+ if (writeset)
+ *writeset = lwriteset;
+ if (exceptset)
+ *exceptset = lexceptset;
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: nready=%d\n", nready));
+ set_errno(0);
+
+ return nready;
+}
+
+/**
+ * Callback registered in the netconn layer for each socket-netconn.
+ * Processes recvevent (data available) and wakes up tasks waiting for select.
+ */
+static void
+event_callback(struct netconn *conn, enum netconn_evt evt, u16_t len)
+{
+ int s;
+ struct lwip_socket *sock;
+ struct lwip_select_cb *scb;
+
+ LWIP_UNUSED_ARG(len);
+
+ /* Get socket */
+ if (conn) {
+ s = conn->socket;
+ if (s < 0) {
+ /* Data comes in right away after an accept, even though
+ * the server task might not have created a new socket yet.
+ * Just count down (or up) if that's the case and we
+ * will use the data later. Note that only receive events
+ * can happen before the new socket is set up. */
+ sys_sem_wait(socksem);
+ if (conn->socket < 0) {
+ if (evt == NETCONN_EVT_RCVPLUS) {
+ conn->socket--;
+ }
+ sys_sem_signal(socksem);
+ return;
+ }
+ sys_sem_signal(socksem);
+ }
+
+ sock = get_socket(s);
+ if (!sock) {
+ return;
+ }
+ } else {
+ return;
+ }
+
+ sys_sem_wait(selectsem);
+ /* Set event as required */
+ switch (evt) {
+ case NETCONN_EVT_RCVPLUS:
+ sock->rcvevent++;
+ break;
+ case NETCONN_EVT_RCVMINUS:
+ sock->rcvevent--;
+ break;
+ case NETCONN_EVT_SENDPLUS:
+ sock->sendevent = 1;
+ break;
+ case NETCONN_EVT_SENDMINUS:
+ sock->sendevent = 0;
+ break;
+ default:
+ LWIP_ASSERT("unknown event", 0);
+ break;
+ }
+ sys_sem_signal(selectsem);
+
+ /* Now decide if anyone is waiting for this socket */
+ /* NOTE: This code is written this way to protect the select link list
+ but to avoid a deadlock situation by releasing socksem before
+ signalling for the select. This means we need to go through the list
+ multiple times ONLY IF a select was actually waiting. We go through
+ the list the number of waiting select calls + 1. This list is
+ expected to be small. */
+ while (1) {
+ sys_sem_wait(selectsem);
+ for (scb = select_cb_list; scb; scb = scb->next) {
+ if (scb->sem_signalled == 0) {
+ /* Test this select call for our socket */
+ if (scb->readset && FD_ISSET(s, scb->readset))
+ if (sock->rcvevent > 0)
+ break;
+ if (scb->writeset && FD_ISSET(s, scb->writeset))
+ if (sock->sendevent)
+ break;
+ }
+ }
+ if (scb) {
+ scb->sem_signalled = 1;
+ sys_sem_signal(scb->sem);
+ sys_sem_signal(selectsem);
+ } else {
+ sys_sem_signal(selectsem);
+ break;
+ }
+ }
+}
+
+/**
+ * Unimplemented: Close one end of a full-duplex connection.
+ * Currently, the full connection is closed.
+ */
+int
+lwip_shutdown(int s, int how)
+{
+ LWIP_UNUSED_ARG(how);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_shutdown(%d, how=%d)\n", s, how));
+ return lwip_close(s); /* XXX temporary hack until proper implementation */
+}
+
+static int
+lwip_getaddrname(int s, struct sockaddr *name, socklen_t *namelen, u8_t local)
+{
+ struct lwip_socket *sock;
+ struct sockaddr_in sin;
+ struct ip_addr naddr;
+
+ sock = get_socket(s);
+ if (!sock)
+ return -1;
+
+ memset(&sin, 0, sizeof(sin));
+ sin.sin_len = sizeof(sin);
+ sin.sin_family = AF_INET;
+
+ /* get the IP address and port */
+ netconn_getaddr(sock->conn, &naddr, &sin.sin_port, local);
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getaddrname(%d, addr=", s));
+ ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
+ LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", sin.sin_port));
+
+ sin.sin_port = htons(sin.sin_port);
+ sin.sin_addr.s_addr = naddr.addr;
+
+ if (*namelen > sizeof(sin))
+ *namelen = sizeof(sin);
+
+ MEMCPY(name, &sin, *namelen);
+ sock_set_errno(sock, 0);
+ return 0;
+}
+
+int
+lwip_getpeername(int s, struct sockaddr *name, socklen_t *namelen)
+{
+ return lwip_getaddrname(s, name, namelen, 0);
+}
+
+int
+lwip_getsockname(int s, struct sockaddr *name, socklen_t *namelen)
+{
+ return lwip_getaddrname(s, name, namelen, 1);
+}
+
+int
+lwip_getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
+{
+ err_t err = ERR_OK;
+ struct lwip_socket *sock = get_socket(s);
+ struct lwip_setgetsockopt_data data;
+
+ if (!sock)
+ return -1;
+
+ if ((NULL == optval) || (NULL == optlen)) {
+ sock_set_errno(sock, EFAULT);
+ return -1;
+ }
+
+ /* Do length and type checks for the various options first, to keep it readable. */
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ case SO_ACCEPTCONN:
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_ERROR:
+ case SO_KEEPALIVE:
+ /* UNIMPL case SO_CONTIMEO: */
+ /* UNIMPL case SO_SNDTIMEO: */
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+#endif /* LWIP_SO_RCVBUF */
+ /* UNIMPL case SO_OOBINLINE: */
+ /* UNIMPL case SO_SNDBUF: */
+ /* UNIMPL case SO_RCVLOWAT: */
+ /* UNIMPL case SO_SNDLOWAT: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ case SO_TYPE:
+ /* UNIMPL case SO_USELOOPBACK: */
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+
+ case SO_NO_CHECK:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+#if LWIP_UDP
+ if ((sock->conn->type != NETCONN_UDP) ||
+ ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
+ /* this flag is only available for UDP, not for UDP lite */
+ err = EAFNOSUPPORT;
+ }
+#endif /* LWIP_UDP */
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ /* UNIMPL case IP_HDRINCL: */
+ /* UNIMPL case IP_RCVDSTADDR: */
+ /* UNIMPL case IP_RCVIF: */
+ case IP_TTL:
+ case IP_TOS:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ if (*optlen < sizeof(u8_t)) {
+ err = EINVAL;
+ }
+ break;
+ case IP_MULTICAST_IF:
+ if (*optlen < sizeof(struct in_addr)) {
+ err = EINVAL;
+ }
+ break;
+#endif /* LWIP_IGMP */
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no TCP socket, ignore any options. */
+ if (sock->conn->type != NETCONN_TCP)
+ return 0;
+
+ switch (optname) {
+ case TCP_NODELAY:
+ case TCP_KEEPALIVE:
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ case TCP_KEEPINTVL:
+ case TCP_KEEPCNT:
+#endif /* LWIP_TCP_KEEPALIVE */
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_UDP && LWIP_UDPLITE
+/* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ if (*optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no UDP lite socket, ignore any options. */
+ if (sock->conn->type != NETCONN_UDPLITE)
+ return 0;
+
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ case UDPLITE_RECV_CSCOV:
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP && LWIP_UDPLITE*/
+/* UNDEFINED LEVEL */
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
+ s, level, optname));
+ err = ENOPROTOOPT;
+ } /* switch */
+
+
+ if (err != ERR_OK) {
+ sock_set_errno(sock, err);
+ return -1;
+ }
+
+ /* Now do the actual option processing */
+ data.sock = sock;
+ data.level = level;
+ data.optname = optname;
+ data.optval = optval;
+ data.optlen = optlen;
+ data.err = err;
+ tcpip_callback(lwip_getsockopt_internal, &data);
+ sys_arch_sem_wait(sock->conn->op_completed, 0);
+ /* maybe lwip_getsockopt_internal has changed err */
+ err = data.err;
+
+ sock_set_errno(sock, err);
+ return err ? -1 : 0;
+}
+
+static void
+lwip_getsockopt_internal(void *arg)
+{
+ struct lwip_socket *sock;
+#ifdef LWIP_DEBUG
+ int s;
+#endif /* LWIP_DEBUG */
+ int level, optname;
+ void *optval;
+ struct lwip_setgetsockopt_data *data;
+
+ LWIP_ASSERT("arg != NULL", arg != NULL);
+
+ data = (struct lwip_setgetsockopt_data*)arg;
+ sock = data->sock;
+#ifdef LWIP_DEBUG
+ s = data->s;
+#endif /* LWIP_DEBUG */
+ level = data->level;
+ optname = data->optname;
+ optval = data->optval;
+
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ /* The option flags */
+ case SO_ACCEPTCONN:
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_KEEPALIVE:
+ /* UNIMPL case SO_OOBINCLUDE: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ /*case SO_USELOOPBACK: UNIMPL */
+ *(int*)optval = sock->conn->pcb.ip->so_options & optname;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, optname=0x%x, ..) = %s\n",
+ s, optname, (*(int*)optval?"on":"off")));
+ break;
+
+ case SO_TYPE:
+ switch (NETCONNTYPE_GROUP(sock->conn->type)) {
+ case NETCONN_RAW:
+ *(int*)optval = SOCK_RAW;
+ break;
+ case NETCONN_TCP:
+ *(int*)optval = SOCK_STREAM;
+ break;
+ case NETCONN_UDP:
+ *(int*)optval = SOCK_DGRAM;
+ break;
+ default: /* unrecognized socket type */
+ *(int*)optval = sock->conn->type;
+ LWIP_DEBUGF(SOCKETS_DEBUG,
+ ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE): unrecognized socket type %d\n",
+ s, *(int *)optval));
+ } /* switch (sock->conn->type) */
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE) = %d\n",
+ s, *(int *)optval));
+ break;
+
+ case SO_ERROR:
+ if (sock->err == 0) {
+ sock_set_errno(sock, err_to_errno(sock->conn->err));
+ }
+ *(int *)optval = sock->err;
+ sock->err = 0;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_ERROR) = %d\n",
+ s, *(int *)optval));
+ break;
+
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+ *(int *)optval = sock->conn->recv_timeout;
+ break;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+ *(int *)optval = sock->conn->recv_bufsize;
+ break;
+#endif /* LWIP_SO_RCVBUF */
+#if LWIP_UDP
+ case SO_NO_CHECK:
+ *(int*)optval = (udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_NOCHKSUM) ? 1 : 0;
+ break;
+#endif /* LWIP_UDP*/
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ case IP_TTL:
+ *(int*)optval = sock->conn->pcb.ip->ttl;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TTL) = %d\n",
+ s, *(int *)optval));
+ break;
+ case IP_TOS:
+ *(int*)optval = sock->conn->pcb.ip->tos;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TOS) = %d\n",
+ s, *(int *)optval));
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ *(u8_t*)optval = sock->conn->pcb.ip->ttl;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_TTL) = %d\n",
+ s, *(int *)optval));
+ break;
+ case IP_MULTICAST_IF:
+ ((struct in_addr*) optval)->s_addr = sock->conn->pcb.udp->multicast_ip.addr;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_IF) = 0x%"X32_F"\n",
+ s, *(u32_t *)optval));
+ break;
+#endif /* LWIP_IGMP */
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ switch (optname) {
+ case TCP_NODELAY:
+ *(int*)optval = (sock->conn->pcb.tcp->flags & TF_NODELAY);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, TCP_NODELAY) = %s\n",
+ s, (*(int*)optval)?"on":"off") );
+ break;
+ case TCP_KEEPALIVE:
+ *(int*)optval = (int)sock->conn->pcb.tcp->keep_idle;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPALIVE) = %d\n",
+ s, *(int *)optval));
+ break;
+
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ *(int*)optval = (int)(sock->conn->pcb.tcp->keep_idle/1000);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPIDLE) = %d\n",
+ s, *(int *)optval));
+ break;
+ case TCP_KEEPINTVL:
+ *(int*)optval = (int)(sock->conn->pcb.tcp->keep_intvl/1000);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPINTVL) = %d\n",
+ s, *(int *)optval));
+ break;
+ case TCP_KEEPCNT:
+ *(int*)optval = (int)sock->conn->pcb.tcp->keep_cnt;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPCNT) = %d\n",
+ s, *(int *)optval));
+ break;
+#endif /* LWIP_TCP_KEEPALIVE */
+
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_UDP && LWIP_UDPLITE
+ /* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ *(int*)optval = sock->conn->pcb.udp->chksum_len_tx;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) = %d\n",
+ s, (*(int*)optval)) );
+ break;
+ case UDPLITE_RECV_CSCOV:
+ *(int*)optval = sock->conn->pcb.udp->chksum_len_rx;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) = %d\n",
+ s, (*(int*)optval)) );
+ break;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP */
+ } /* switch (level) */
+ sys_sem_signal(sock->conn->op_completed);
+}
+
+int
+lwip_setsockopt(int s, int level, int optname, const void *optval, socklen_t optlen)
+{
+ struct lwip_socket *sock = get_socket(s);
+ int err = ERR_OK;
+ struct lwip_setgetsockopt_data data;
+
+ if (!sock)
+ return -1;
+
+ if (NULL == optval) {
+ sock_set_errno(sock, EFAULT);
+ return -1;
+ }
+
+ /* Do length and type checks for the various options first, to keep it readable. */
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_KEEPALIVE:
+ /* UNIMPL case case SO_CONTIMEO: */
+ /* UNIMPL case case SO_SNDTIMEO: */
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+#endif /* LWIP_SO_RCVBUF */
+ /* UNIMPL case SO_OOBINLINE: */
+ /* UNIMPL case SO_SNDBUF: */
+ /* UNIMPL case SO_RCVLOWAT: */
+ /* UNIMPL case SO_SNDLOWAT: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ /* UNIMPL case SO_USELOOPBACK: */
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+ case SO_NO_CHECK:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+#if LWIP_UDP
+ if ((sock->conn->type != NETCONN_UDP) ||
+ ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
+ /* this flag is only available for UDP, not for UDP lite */
+ err = EAFNOSUPPORT;
+ }
+#endif /* LWIP_UDP */
+ break;
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ /* UNIMPL case IP_HDRINCL: */
+ /* UNIMPL case IP_RCVDSTADDR: */
+ /* UNIMPL case IP_RCVIF: */
+ case IP_TTL:
+ case IP_TOS:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ }
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ if (optlen < sizeof(u8_t)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+ case IP_MULTICAST_IF:
+ if (optlen < sizeof(struct in_addr)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ if (optlen < sizeof(struct ip_mreq)) {
+ err = EINVAL;
+ }
+ if (NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
+ err = EAFNOSUPPORT;
+ }
+ break;
+#endif /* LWIP_IGMP */
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no TCP socket, ignore any options. */
+ if (sock->conn->type != NETCONN_TCP)
+ return 0;
+
+ switch (optname) {
+ case TCP_NODELAY:
+ case TCP_KEEPALIVE:
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ case TCP_KEEPINTVL:
+ case TCP_KEEPCNT:
+#endif /* LWIP_TCP_KEEPALIVE */
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_UDP && LWIP_UDPLITE
+/* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ if (optlen < sizeof(int)) {
+ err = EINVAL;
+ break;
+ }
+
+ /* If this is no UDP lite socket, ignore any options. */
+ if (sock->conn->type != NETCONN_UDPLITE)
+ return 0;
+
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ case UDPLITE_RECV_CSCOV:
+ break;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
+ s, optname));
+ err = ENOPROTOOPT;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP && LWIP_UDPLITE */
+/* UNDEFINED LEVEL */
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
+ s, level, optname));
+ err = ENOPROTOOPT;
+ } /* switch (level) */
+
+
+ if (err != ERR_OK) {
+ sock_set_errno(sock, err);
+ return -1;
+ }
+
+
+ /* Now do the actual option processing */
+ data.sock = sock;
+ data.level = level;
+ data.optname = optname;
+ data.optval = (void*)optval;
+ data.optlen = &optlen;
+ data.err = err;
+ tcpip_callback(lwip_setsockopt_internal, &data);
+ sys_arch_sem_wait(sock->conn->op_completed, 0);
+ /* maybe lwip_setsockopt_internal has changed err */
+ err = data.err;
+
+ sock_set_errno(sock, err);
+ return err ? -1 : 0;
+}
+
+static void
+lwip_setsockopt_internal(void *arg)
+{
+ struct lwip_socket *sock;
+#ifdef LWIP_DEBUG
+ int s;
+#endif /* LWIP_DEBUG */
+ int level, optname;
+ const void *optval;
+ struct lwip_setgetsockopt_data *data;
+
+ LWIP_ASSERT("arg != NULL", arg != NULL);
+
+ data = (struct lwip_setgetsockopt_data*)arg;
+ sock = data->sock;
+#ifdef LWIP_DEBUG
+ s = data->s;
+#endif /* LWIP_DEBUG */
+ level = data->level;
+ optname = data->optname;
+ optval = data->optval;
+
+ switch (level) {
+
+/* Level: SOL_SOCKET */
+ case SOL_SOCKET:
+ switch (optname) {
+
+ /* The option flags */
+ case SO_BROADCAST:
+ /* UNIMPL case SO_DEBUG: */
+ /* UNIMPL case SO_DONTROUTE: */
+ case SO_KEEPALIVE:
+ /* UNIMPL case SO_OOBINCLUDE: */
+#if SO_REUSE
+ case SO_REUSEADDR:
+ case SO_REUSEPORT:
+#endif /* SO_REUSE */
+ /* UNIMPL case SO_USELOOPBACK: */
+ if (*(int*)optval) {
+ sock->conn->pcb.ip->so_options |= optname;
+ } else {
+ sock->conn->pcb.ip->so_options &= ~optname;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, optname=0x%x, ..) -> %s\n",
+ s, optname, (*(int*)optval?"on":"off")));
+ break;
+#if LWIP_SO_RCVTIMEO
+ case SO_RCVTIMEO:
+ sock->conn->recv_timeout = ( *(int*)optval );
+ break;
+#endif /* LWIP_SO_RCVTIMEO */
+#if LWIP_SO_RCVBUF
+ case SO_RCVBUF:
+ sock->conn->recv_bufsize = ( *(int*)optval );
+ break;
+#endif /* LWIP_SO_RCVBUF */
+#if LWIP_UDP
+ case SO_NO_CHECK:
+ if (*(int*)optval) {
+ udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_NOCHKSUM);
+ } else {
+ udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_NOCHKSUM);
+ }
+ break;
+#endif /* LWIP_UDP */
+ } /* switch (optname) */
+ break;
+
+/* Level: IPPROTO_IP */
+ case IPPROTO_IP:
+ switch (optname) {
+ case IP_TTL:
+ sock->conn->pcb.ip->ttl = (u8_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TTL, ..) -> %d\n",
+ s, sock->conn->pcb.ip->ttl));
+ break;
+ case IP_TOS:
+ sock->conn->pcb.ip->tos = (u8_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TOS, ..)-> %d\n",
+ s, sock->conn->pcb.ip->tos));
+ break;
+#if LWIP_IGMP
+ case IP_MULTICAST_TTL:
+ sock->conn->pcb.udp->ttl = (u8_t)(*(u8_t*)optval);
+ break;
+ case IP_MULTICAST_IF:
+ sock->conn->pcb.udp->multicast_ip.addr = ((struct in_addr*) optval)->s_addr;
+ break;
+ case IP_ADD_MEMBERSHIP:
+ case IP_DROP_MEMBERSHIP:
+ {
+ /* If this is a TCP or a RAW socket, ignore these options. */
+ struct ip_mreq *imr = (struct ip_mreq *)optval;
+ if(optname == IP_ADD_MEMBERSHIP){
+ data->err = igmp_joingroup((struct ip_addr*)&(imr->imr_interface.s_addr), (struct ip_addr*)&(imr->imr_multiaddr.s_addr));
+ } else {
+ data->err = igmp_leavegroup((struct ip_addr*)&(imr->imr_interface.s_addr), (struct ip_addr*)&(imr->imr_multiaddr.s_addr));
+ }
+ if(data->err != ERR_OK) {
+ data->err = EADDRNOTAVAIL;
+ }
+ }
+ break;
+#endif /* LWIP_IGMP */
+ } /* switch (optname) */
+ break;
+
+#if LWIP_TCP
+/* Level: IPPROTO_TCP */
+ case IPPROTO_TCP:
+ switch (optname) {
+ case TCP_NODELAY:
+ if (*(int*)optval) {
+ sock->conn->pcb.tcp->flags |= TF_NODELAY;
+ } else {
+ sock->conn->pcb.tcp->flags &= ~TF_NODELAY;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_NODELAY) -> %s\n",
+ s, (*(int *)optval)?"on":"off") );
+ break;
+ case TCP_KEEPALIVE:
+ sock->conn->pcb.tcp->keep_idle = (u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPALIVE) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_idle));
+ break;
+
+#if LWIP_TCP_KEEPALIVE
+ case TCP_KEEPIDLE:
+ sock->conn->pcb.tcp->keep_idle = 1000*(u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPIDLE) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_idle));
+ break;
+ case TCP_KEEPINTVL:
+ sock->conn->pcb.tcp->keep_intvl = 1000*(u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPINTVL) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_intvl));
+ break;
+ case TCP_KEEPCNT:
+ sock->conn->pcb.tcp->keep_cnt = (u32_t)(*(int*)optval);
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPCNT) -> %"U32_F"\n",
+ s, sock->conn->pcb.tcp->keep_cnt));
+ break;
+#endif /* LWIP_TCP_KEEPALIVE */
+
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_TCP*/
+#if LWIP_UDP && LWIP_UDPLITE
+ /* Level: IPPROTO_UDPLITE */
+ case IPPROTO_UDPLITE:
+ switch (optname) {
+ case UDPLITE_SEND_CSCOV:
+ if ((*(int*)optval != 0) && (*(int*)optval < 8)) {
+ /* don't allow illegal values! */
+ sock->conn->pcb.udp->chksum_len_tx = 8;
+ } else {
+ sock->conn->pcb.udp->chksum_len_tx = *(int*)optval;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) -> %d\n",
+ s, (*(int*)optval)) );
+ break;
+ case UDPLITE_RECV_CSCOV:
+ if ((*(int*)optval != 0) && (*(int*)optval < 8)) {
+ /* don't allow illegal values! */
+ sock->conn->pcb.udp->chksum_len_rx = 8;
+ } else {
+ sock->conn->pcb.udp->chksum_len_rx = *(int*)optval;
+ }
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) -> %d\n",
+ s, (*(int*)optval)) );
+ break;
+ } /* switch (optname) */
+ break;
+#endif /* LWIP_UDP */
+ } /* switch (level) */
+ sys_sem_signal(sock->conn->op_completed);
+}
+
+int
+lwip_ioctl(int s, long cmd, void *argp)
+{
+ struct lwip_socket *sock = get_socket(s);
+ u16_t buflen = 0;
+ s16_t recv_avail;
+
+ if (!sock)
+ return -1;
+
+ switch (cmd) {
+ case FIONREAD:
+ if (!argp) {
+ sock_set_errno(sock, EINVAL);
+ return -1;
+ }
+
+ SYS_ARCH_GET(sock->conn->recv_avail, recv_avail);
+ if (recv_avail < 0)
+ recv_avail = 0;
+ *((u16_t*)argp) = (u16_t)recv_avail;
+
+ /* Check if there is data left from the last recv operation. /maq 041215 */
+ if (sock->lastdata) {
+ buflen = netbuf_len(sock->lastdata);
+ buflen -= sock->lastoffset;
+
+ *((u16_t*)argp) += buflen;
+ }
+
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONREAD, %p) = %"U16_F"\n", s, argp, *((u16_t*)argp)));
+ sock_set_errno(sock, 0);
+ return 0;
+
+ case FIONBIO:
+ if (argp && *(u32_t*)argp)
+ sock->flags |= O_NONBLOCK;
+ else
+ sock->flags &= ~O_NONBLOCK;
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONBIO, %d)\n", s, !!(sock->flags & O_NONBLOCK)));
+ sock_set_errno(sock, 0);
+ return 0;
+
+ default:
+ LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, UNIMPL: 0x%lx, %p)\n", s, cmd, argp));
+ sock_set_errno(sock, ENOSYS); /* not yet implemented */
+ return -1;
+ } /* switch (cmd) */
+}
+
+#endif /* LWIP_SOCKET */
diff --git a/core/lwip/src/api/tcpip.c b/core/lwip/src/api/tcpip.c
new file mode 100644
index 00000000..002df90b
--- /dev/null
+++ b/core/lwip/src/api/tcpip.c
@@ -0,0 +1,596 @@
+/**
+ * @file
+ * Sequential API Main thread module
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if !NO_SYS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/sys.h"
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip_frag.h"
+#include "lwip/tcp.h"
+#include "lwip/autoip.h"
+#include "lwip/dhcp.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+#include "lwip/tcpip.h"
+#include "lwip/init.h"
+#include "netif/etharp.h"
+#include "netif/ppp_oe.h"
+
+/* global variables */
+static void (* tcpip_init_done)(void *arg);
+static void *tcpip_init_done_arg;
+static sys_mbox_t mbox = SYS_MBOX_NULL;
+
+#if LWIP_TCPIP_CORE_LOCKING
+/** The global semaphore to lock the stack. */
+sys_sem_t lock_tcpip_core;
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+#if LWIP_TCP
+/* global variable that shows if the tcp timer is currently scheduled or not */
+static int tcpip_tcp_timer_active;
+
+/**
+ * Timer callback function that calls tcp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+tcpip_tcp_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+
+ /* call TCP timer handler */
+ tcp_tmr();
+ /* timer still needed? */
+ if (tcp_active_pcbs || tcp_tw_pcbs) {
+ /* restart timer */
+ sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
+ } else {
+ /* disable timer */
+ tcpip_tcp_timer_active = 0;
+ }
+}
+
+#if !NO_SYS
+/**
+ * Called from TCP_REG when registering a new PCB:
+ * the reason is to have the TCP timer only running when
+ * there are active (or time-wait) PCBs.
+ */
+void
+tcp_timer_needed(void)
+{
+ /* timer is off but needed again? */
+ if (!tcpip_tcp_timer_active && (tcp_active_pcbs || tcp_tw_pcbs)) {
+ /* enable and start timer */
+ tcpip_tcp_timer_active = 1;
+ sys_timeout(TCP_TMR_INTERVAL, tcpip_tcp_timer, NULL);
+ }
+}
+#endif /* !NO_SYS */
+#endif /* LWIP_TCP */
+
+#if IP_REASSEMBLY
+/**
+ * Timer callback function that calls ip_reass_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+ip_reass_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: ip_reass_tmr()\n"));
+ ip_reass_tmr();
+ sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
+}
+#endif /* IP_REASSEMBLY */
+
+#if LWIP_ARP
+/**
+ * Timer callback function that calls etharp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+arp_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: etharp_tmr()\n"));
+ etharp_tmr();
+ sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
+}
+#endif /* LWIP_ARP */
+
+#if LWIP_DHCP
+/**
+ * Timer callback function that calls dhcp_coarse_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+dhcp_timer_coarse(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: dhcp_coarse_tmr()\n"));
+ dhcp_coarse_tmr();
+ sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
+}
+
+/**
+ * Timer callback function that calls dhcp_fine_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+dhcp_timer_fine(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: dhcp_fine_tmr()\n"));
+ dhcp_fine_tmr();
+ sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
+}
+#endif /* LWIP_DHCP */
+
+#if LWIP_AUTOIP
+/**
+ * Timer callback function that calls autoip_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+autoip_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: autoip_tmr()\n"));
+ autoip_tmr();
+ sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
+}
+#endif /* LWIP_AUTOIP */
+
+#if LWIP_IGMP
+/**
+ * Timer callback function that calls igmp_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+igmp_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: igmp_tmr()\n"));
+ igmp_tmr();
+ sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
+}
+#endif /* LWIP_IGMP */
+
+#if LWIP_DNS
+/**
+ * Timer callback function that calls dns_tmr() and reschedules itself.
+ *
+ * @param arg unused argument
+ */
+static void
+dns_timer(void *arg)
+{
+ LWIP_UNUSED_ARG(arg);
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip: dns_tmr()\n"));
+ dns_tmr();
+ sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
+}
+#endif /* LWIP_DNS */
+
+/**
+ * The main lwIP thread. This thread has exclusive access to lwIP core functions
+ * (unless access to them is not locked). Other threads communicate with this
+ * thread using message boxes.
+ *
+ * It also starts all the timers to make sure they are running in the right
+ * thread context.
+ *
+ * @param arg unused argument
+ */
+static void
+tcpip_thread(void *arg)
+{
+ struct tcpip_msg *msg;
+ LWIP_UNUSED_ARG(arg);
+
+#if IP_REASSEMBLY
+ sys_timeout(IP_TMR_INTERVAL, ip_reass_timer, NULL);
+#endif /* IP_REASSEMBLY */
+#if LWIP_ARP
+ sys_timeout(ARP_TMR_INTERVAL, arp_timer, NULL);
+#endif /* LWIP_ARP */
+#if LWIP_DHCP
+ sys_timeout(DHCP_COARSE_TIMER_MSECS, dhcp_timer_coarse, NULL);
+ sys_timeout(DHCP_FINE_TIMER_MSECS, dhcp_timer_fine, NULL);
+#endif /* LWIP_DHCP */
+#if LWIP_AUTOIP
+ sys_timeout(AUTOIP_TMR_INTERVAL, autoip_timer, NULL);
+#endif /* LWIP_AUTOIP */
+#if LWIP_IGMP
+ sys_timeout(IGMP_TMR_INTERVAL, igmp_timer, NULL);
+#endif /* LWIP_IGMP */
+#if LWIP_DNS
+ sys_timeout(DNS_TMR_INTERVAL, dns_timer, NULL);
+#endif /* LWIP_DNS */
+
+ if (tcpip_init_done != NULL) {
+ tcpip_init_done(tcpip_init_done_arg);
+ }
+
+ LOCK_TCPIP_CORE();
+ while (1) { /* MAIN Loop */
+ sys_mbox_fetch(mbox, (void *)&msg);
+ switch (msg->type) {
+#if LWIP_NETCONN
+ case TCPIP_MSG_API:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: API message %p\n", (void *)msg));
+ msg->msg.apimsg->function(&(msg->msg.apimsg->msg));
+ break;
+#endif /* LWIP_NETCONN */
+
+ case TCPIP_MSG_INPKT:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: PACKET %p\n", (void *)msg));
+#if LWIP_ARP
+ if (msg->msg.inp.netif->flags & NETIF_FLAG_ETHARP) {
+ ethernet_input(msg->msg.inp.p, msg->msg.inp.netif);
+ } else
+#endif /* LWIP_ARP */
+ { ip_input(msg->msg.inp.p, msg->msg.inp.netif);
+ }
+ memp_free(MEMP_TCPIP_MSG_INPKT, msg);
+ break;
+
+#if LWIP_NETIF_API
+ case TCPIP_MSG_NETIFAPI:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: Netif API message %p\n", (void *)msg));
+ msg->msg.netifapimsg->function(&(msg->msg.netifapimsg->msg));
+ break;
+#endif /* LWIP_NETIF_API */
+
+ case TCPIP_MSG_CALLBACK:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: CALLBACK %p\n", (void *)msg));
+ msg->msg.cb.f(msg->msg.cb.ctx);
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ break;
+
+ case TCPIP_MSG_TIMEOUT:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: TIMEOUT %p\n", (void *)msg));
+ sys_timeout(msg->msg.tmo.msecs, msg->msg.tmo.h, msg->msg.tmo.arg);
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ break;
+ case TCPIP_MSG_UNTIMEOUT:
+ LWIP_DEBUGF(TCPIP_DEBUG, ("tcpip_thread: UNTIMEOUT %p\n", (void *)msg));
+ sys_untimeout(msg->msg.tmo.h, msg->msg.tmo.arg);
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ break;
+
+ default:
+ break;
+ }
+ }
+}
+
+/**
+ * Pass a received packet to tcpip_thread for input processing
+ *
+ * @param p the received packet, p->payload pointing to the Ethernet header or
+ * to an IP header (if netif doesn't got NETIF_FLAG_ETHARP flag)
+ * @param inp the network interface on which the packet was received
+ */
+err_t
+tcpip_input(struct pbuf *p, struct netif *inp)
+{
+ struct tcpip_msg *msg;
+
+ if (mbox != SYS_MBOX_NULL) {
+ msg = memp_malloc(MEMP_TCPIP_MSG_INPKT);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_INPKT;
+ msg->msg.inp.p = p;
+ msg->msg.inp.netif = inp;
+ if (sys_mbox_trypost(mbox, msg) != ERR_OK) {
+ memp_free(MEMP_TCPIP_MSG_INPKT, msg);
+ return ERR_MEM;
+ }
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+/**
+ * Call a specific function in the thread context of
+ * tcpip_thread for easy access synchronization.
+ * A function called in that way may access lwIP core code
+ * without fearing concurrent access.
+ *
+ * @param f the function to call
+ * @param ctx parameter passed to f
+ * @param block 1 to block until the request is posted, 0 to non-blocking mode
+ * @return ERR_OK if the function was called, another err_t if not
+ */
+err_t
+tcpip_callback_with_block(void (*f)(void *ctx), void *ctx, u8_t block)
+{
+ struct tcpip_msg *msg;
+
+ if (mbox != SYS_MBOX_NULL) {
+ msg = memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_CALLBACK;
+ msg->msg.cb.f = f;
+ msg->msg.cb.ctx = ctx;
+ if (block) {
+ sys_mbox_post(mbox, msg);
+ } else {
+ if (sys_mbox_trypost(mbox, msg) != ERR_OK) {
+ memp_free(MEMP_TCPIP_MSG_API, msg);
+ return ERR_MEM;
+ }
+ }
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+/**
+ * call sys_timeout in tcpip_thread
+ *
+ * @param msec time in miliseconds for timeout
+ * @param h function to be called on timeout
+ * @param arg argument to pass to timeout function h
+ * @return ERR_MEM on memory error, ERR_OK otherwise
+ */
+err_t
+tcpip_timeout(u32_t msecs, sys_timeout_handler h, void *arg)
+{
+ struct tcpip_msg *msg;
+
+ if (mbox != SYS_MBOX_NULL) {
+ msg = memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_TIMEOUT;
+ msg->msg.tmo.msecs = msecs;
+ msg->msg.tmo.h = h;
+ msg->msg.tmo.arg = arg;
+ sys_mbox_post(mbox, msg);
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+/**
+ * call sys_untimeout in tcpip_thread
+ *
+ * @param msec time in miliseconds for timeout
+ * @param h function to be called on timeout
+ * @param arg argument to pass to timeout function h
+ * @return ERR_MEM on memory error, ERR_OK otherwise
+ */
+err_t
+tcpip_untimeout(sys_timeout_handler h, void *arg)
+{
+ struct tcpip_msg *msg;
+
+ if (mbox != SYS_MBOX_NULL) {
+ msg = memp_malloc(MEMP_TCPIP_MSG_API);
+ if (msg == NULL) {
+ return ERR_MEM;
+ }
+
+ msg->type = TCPIP_MSG_UNTIMEOUT;
+ msg->msg.tmo.h = h;
+ msg->msg.tmo.arg = arg;
+ sys_mbox_post(mbox, msg);
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+#if LWIP_NETCONN
+/**
+ * Call the lower part of a netconn_* function
+ * This function is then running in the thread context
+ * of tcpip_thread and has exclusive access to lwIP core code.
+ *
+ * @param apimsg a struct containing the function to call and its parameters
+ * @return ERR_OK if the function was called, another err_t if not
+ */
+err_t
+tcpip_apimsg(struct api_msg *apimsg)
+{
+ struct tcpip_msg msg;
+
+ if (mbox != SYS_MBOX_NULL) {
+ msg.type = TCPIP_MSG_API;
+ msg.msg.apimsg = apimsg;
+ sys_mbox_post(mbox, &msg);
+ sys_arch_sem_wait(apimsg->msg.conn->op_completed, 0);
+ return ERR_OK;
+ }
+ return ERR_VAL;
+}
+
+#if LWIP_TCPIP_CORE_LOCKING
+/**
+ * Call the lower part of a netconn_* function
+ * This function has exclusive access to lwIP core code by locking it
+ * before the function is called.
+ *
+ * @param apimsg a struct containing the function to call and its parameters
+ * @return ERR_OK (only for compatibility fo tcpip_apimsg())
+ */
+err_t
+tcpip_apimsg_lock(struct api_msg *apimsg)
+{
+ LOCK_TCPIP_CORE();
+ apimsg->function(&(apimsg->msg));
+ UNLOCK_TCPIP_CORE();
+ return ERR_OK;
+
+}
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_NETCONN */
+
+#if LWIP_NETIF_API
+#if !LWIP_TCPIP_CORE_LOCKING
+/**
+ * Much like tcpip_apimsg, but calls the lower part of a netifapi_*
+ * function.
+ *
+ * @param netifapimsg a struct containing the function to call and its parameters
+ * @return error code given back by the function that was called
+ */
+err_t
+tcpip_netifapi(struct netifapi_msg* netifapimsg)
+{
+ struct tcpip_msg msg;
+
+ if (mbox != SYS_MBOX_NULL) {
+ netifapimsg->msg.sem = sys_sem_new(0);
+ if (netifapimsg->msg.sem == SYS_SEM_NULL) {
+ netifapimsg->msg.err = ERR_MEM;
+ return netifapimsg->msg.err;
+ }
+
+ msg.type = TCPIP_MSG_NETIFAPI;
+ msg.msg.netifapimsg = netifapimsg;
+ sys_mbox_post(mbox, &msg);
+ sys_sem_wait(netifapimsg->msg.sem);
+ sys_sem_free(netifapimsg->msg.sem);
+ return netifapimsg->msg.err;
+ }
+ return ERR_VAL;
+}
+#else /* !LWIP_TCPIP_CORE_LOCKING */
+/**
+ * Call the lower part of a netifapi_* function
+ * This function has exclusive access to lwIP core code by locking it
+ * before the function is called.
+ *
+ * @param netifapimsg a struct containing the function to call and its parameters
+ * @return ERR_OK (only for compatibility fo tcpip_netifapi())
+ */
+err_t
+tcpip_netifapi_lock(struct netifapi_msg* netifapimsg)
+{
+ LOCK_TCPIP_CORE();
+ netifapimsg->function(&(netifapimsg->msg));
+ UNLOCK_TCPIP_CORE();
+ return netifapimsg->msg.err;
+}
+#endif /* !LWIP_TCPIP_CORE_LOCKING */
+#endif /* LWIP_NETIF_API */
+
+/**
+ * Initialize this module:
+ * - initialize all sub modules
+ * - start the tcpip_thread
+ *
+ * @param initfunc a function to call when tcpip_thread is running and finished initializing
+ * @param arg argument to pass to initfunc
+ */
+void
+tcpip_init(void (* initfunc)(void *), void *arg)
+{
+ lwip_init();
+
+ tcpip_init_done = initfunc;
+ tcpip_init_done_arg = arg;
+ mbox = sys_mbox_new(TCPIP_MBOX_SIZE);
+#if LWIP_TCPIP_CORE_LOCKING
+ lock_tcpip_core = sys_sem_new(1);
+#endif /* LWIP_TCPIP_CORE_LOCKING */
+
+ sys_thread_new(TCPIP_THREAD_NAME, tcpip_thread, NULL, TCPIP_THREAD_STACKSIZE, TCPIP_THREAD_PRIO);
+}
+
+/**
+ * Simple callback function used with tcpip_callback to free a pbuf
+ * (pbuf_free has a wrong signature for tcpip_callback)
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ */
+static void
+pbuf_free_int(void *p)
+{
+ struct pbuf *q = p;
+ pbuf_free(q);
+}
+
+/**
+ * A simple wrapper function that allows you to free a pbuf from interrupt context.
+ *
+ * @param p The pbuf (chain) to be dereferenced.
+ * @return ERR_OK if callback could be enqueued, an err_t if not
+ */
+err_t
+pbuf_free_callback(struct pbuf *p)
+{
+ return tcpip_callback_with_block(pbuf_free_int, p, 0);
+}
+
+/**
+ * A simple wrapper function that allows you to free heap memory from
+ * interrupt context.
+ *
+ * @param m the heap memory to free
+ * @return ERR_OK if callback could be enqueued, an err_t if not
+ */
+err_t
+mem_free_callback(void *m)
+{
+ return tcpip_callback_with_block(mem_free, m, 0);
+}
+
+#endif /* !NO_SYS */
diff --git a/core/lwip/src/arch/sys_arch.c b/core/lwip/src/arch/sys_arch.c
new file mode 100644
index 00000000..db68e864
--- /dev/null
+++ b/core/lwip/src/arch/sys_arch.c
@@ -0,0 +1,79 @@
+#include "arch/sys_arch.h"
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include <core/jiffies.h>
+#include <stdlib.h>
+
+void sys_init(void)
+{
+}
+
+sys_sem_t sys_sem_new(u8_t count)
+{
+ sys_sem_t sem = mem_malloc(sizeof(struct semaphore));
+ if (!sem)
+ return NULL;
+
+ sem_init(sem, count);
+}
+
+void sys_sem_free(sys_sem_t sem)
+{
+ mem_free(sem);
+}
+
+u32_t sys_arch_sem_wait(sys_sem_t sem, u32_t timeout)
+{
+ jiffies_t rv;
+
+ rv = sem_down(sem, (timeout+MS_PER_JIFFY-1)/MS_PER_JIFFY);
+ if (rv == (jiffies_t)-1)
+ return SYS_ARCH_TIMEOUT;
+ else
+ return rv * MS_PER_JIFFY;
+}
+
+sys_mbox_t sys_mbox_new(int size)
+{
+ struct mailbox *mbox;
+
+ mbox = mem_malloc(sizeof(struct mailbox) + size*sizeof(void *));
+ if (!mbox)
+ return NULL;
+
+ mbox_init(mbox, size);
+ return mbox;
+}
+
+void sys_mbox_free(sys_mbox_t mbox)
+{
+ mem_free(mbox);
+}
+
+void sys_mbox_post(sys_mbox_t mbox, void *msg)
+{
+ mbox_post(mbox, msg, 0);
+}
+
+err_t sys_mbox_trypost(sys_mbox_t mbox, void *msg)
+{
+ return mbox_post(mbox, msg, -1);
+}
+
+u32_t sys_arch_mbox_fetch(sys_mbox_t mbox, void **msg, u32_t timeout)
+{
+ jiffies_t rv;
+
+ rv = mbox_fetch(mbox, msg, (timeout+MS_PER_JIFFY-1)/MS_PER_JIFFY);
+ if (rv == (jiffies_t)-1)
+ return SYS_ARCH_TIMEOUT;
+ else
+ return rv * MS_PER_JIFFY;
+}
+
+u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg)
+{
+ return mbox_fetch(mbox, msg, -1);
+}
+
+
diff --git a/core/lwip/src/core/dhcp.c b/core/lwip/src/core/dhcp.c
new file mode 100644
index 00000000..df0f9788
--- /dev/null
+++ b/core/lwip/src/core/dhcp.c
@@ -0,0 +1,1633 @@
+/**
+ * @file
+ * Dynamic Host Configuration Protocol client
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2001-2004 Leon Woestenberg <leon.woestenberg@gmx.net>
+ * Copyright (c) 2001-2004 Axon Digital Design B.V., The Netherlands.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+ *
+ * Author: Leon Woestenberg <leon.woestenberg@gmx.net>
+ *
+ * This is a DHCP client for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 2131 and RFC 2132.
+ *
+ * TODO:
+ * - Proper parsing of DHCP messages exploiting file/sname field overloading.
+ * - Add JavaDoc style documentation (API, internals).
+ * - Support for interfaces other than Ethernet (SLIP, PPP, ...)
+ *
+ * Please coordinate changes and requests with Leon Woestenberg
+ * <leon.woestenberg@gmx.net>
+ *
+ * Integration with your code:
+ *
+ * In lwip/dhcp.h
+ * #define DHCP_COARSE_TIMER_SECS (recommended 60 which is a minute)
+ * #define DHCP_FINE_TIMER_MSECS (recommended 500 which equals TCP coarse timer)
+ *
+ * Then have your application call dhcp_coarse_tmr() and
+ * dhcp_fine_tmr() on the defined intervals.
+ *
+ * dhcp_start(struct netif *netif);
+ * starts a DHCP client instance which configures the interface by
+ * obtaining an IP address lease and maintaining it.
+ *
+ * Use dhcp_release(netif) to end the lease and use dhcp_stop(netif)
+ * to remove the DHCP client.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/stats.h"
+#include "lwip/mem.h"
+#include "lwip/udp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/inet.h"
+#include "lwip/sys.h"
+#include "lwip/dhcp.h"
+#include "lwip/autoip.h"
+#include "lwip/dns.h"
+#include "netif/etharp.h"
+
+#include <string.h>
+
+/** Default for DHCP_GLOBAL_XID is 0xABCD0000
+ * This can be changed by defining DHCP_GLOBAL_XID and DHCP_GLOBAL_XID_HEADER, e.g.
+ * #define DHCP_GLOBAL_XID_HEADER "stdlib.h"
+ * #define DHCP_GLOBAL_XID rand()
+ */
+#ifdef DHCP_GLOBAL_XID_HEADER
+#include DHCP_GLOBAL_XID_HEADER /* include optional starting XID generation prototypes */
+#endif
+
+/** DHCP_OPTION_MAX_MSG_SIZE is set to the MTU
+ * MTU is checked to be big enough in dhcp_start */
+#define DHCP_MAX_MSG_LEN(netif) (netif->mtu)
+#define DHCP_MAX_MSG_LEN_MIN_REQUIRED 576
+
+/* DHCP client state machine functions */
+static void dhcp_handle_ack(struct netif *netif);
+static void dhcp_handle_nak(struct netif *netif);
+static void dhcp_handle_offer(struct netif *netif);
+
+static err_t dhcp_discover(struct netif *netif);
+static err_t dhcp_select(struct netif *netif);
+static void dhcp_check(struct netif *netif);
+static void dhcp_bind(struct netif *netif);
+#if DHCP_DOES_ARP_CHECK
+static err_t dhcp_decline(struct netif *netif);
+#endif /* DHCP_DOES_ARP_CHECK */
+static err_t dhcp_rebind(struct netif *netif);
+static void dhcp_set_state(struct dhcp *dhcp, u8_t new_state);
+
+/* receive, unfold, parse and free incoming messages */
+static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port);
+static err_t dhcp_unfold_reply(struct dhcp *dhcp);
+static u8_t *dhcp_get_option_ptr(struct dhcp *dhcp, u8_t option_type);
+static u8_t dhcp_get_option_byte(u8_t *ptr);
+#if 0
+static u16_t dhcp_get_option_short(u8_t *ptr);
+#endif
+static u32_t dhcp_get_option_long(u8_t *ptr);
+static void dhcp_free_reply(struct dhcp *dhcp);
+
+/* set the DHCP timers */
+static void dhcp_timeout(struct netif *netif);
+static void dhcp_t1_timeout(struct netif *netif);
+static void dhcp_t2_timeout(struct netif *netif);
+
+/* build outgoing messages */
+/* create a DHCP request, fill in common headers */
+static err_t dhcp_create_request(struct netif *netif);
+/* free a DHCP request */
+static void dhcp_delete_request(struct netif *netif);
+/* add a DHCP option (type, then length in bytes) */
+static void dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len);
+/* add option values */
+static void dhcp_option_byte(struct dhcp *dhcp, u8_t value);
+static void dhcp_option_short(struct dhcp *dhcp, u16_t value);
+static void dhcp_option_long(struct dhcp *dhcp, u32_t value);
+/* always add the DHCP options trailer to end and pad */
+static void dhcp_option_trailer(struct dhcp *dhcp);
+
+/**
+ * Back-off the DHCP client (because of a received NAK response).
+ *
+ * Back-off the DHCP client because of a received NAK. Receiving a
+ * NAK means the client asked for something non-sensible, for
+ * example when it tries to renew a lease obtained on another network.
+ *
+ * We clear any existing set IP address and restart DHCP negotiation
+ * afresh (as per RFC2131 3.2.3).
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_nak(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_handle_nak(netif=%p) %c%c%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* Set the interface down since the address must no longer be used, as per RFC2131 */
+ netif_set_down(netif);
+ /* remove IP address from interface */
+ netif_set_ipaddr(netif, IP_ADDR_ANY);
+ netif_set_gw(netif, IP_ADDR_ANY);
+ netif_set_netmask(netif, IP_ADDR_ANY);
+ /* Change to a defined state */
+ dhcp_set_state(dhcp, DHCP_BACKING_OFF);
+ /* We can immediately restart discovery */
+ dhcp_discover(netif);
+}
+
+/**
+ * Checks if the offered IP address is already in use.
+ *
+ * It does so by sending an ARP request for the offered address and
+ * entering CHECKING state. If no ARP reply is received within a small
+ * interval, the address is assumed to be free for use by us.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_check(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_check(netif=%p) %c%c\n", (void *)netif, (s16_t)netif->name[0],
+ (s16_t)netif->name[1]));
+ dhcp_set_state(dhcp, DHCP_CHECKING);
+ /* create an ARP query for the offered IP address, expecting that no host
+ responds, as the IP address should not be in use. */
+ result = etharp_query(netif, &dhcp->offered_ip_addr, NULL);
+ if (result != ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_check: could not perform ARP query\n"));
+ }
+ dhcp->tries++;
+ msecs = 500;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_check(): set request timeout %"U16_F" msecs\n", msecs));
+}
+
+/**
+ * Remember the configuration offered by a DHCP server.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_offer(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ /* obtain the server address */
+ u8_t *option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_SERVER_ID);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_handle_offer(netif=%p) %c%c%"U16_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ if (option_ptr != NULL) {
+ dhcp->server_ip_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): server 0x%08"X32_F"\n", dhcp->server_ip_addr.addr));
+ /* remember offered address */
+ ip_addr_set(&dhcp->offered_ip_addr, (struct ip_addr *)&dhcp->msg_in->yiaddr);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_handle_offer(): offer for 0x%08"X32_F"\n", dhcp->offered_ip_addr.addr));
+
+ dhcp_select(netif);
+ }
+}
+
+/**
+ * Select a DHCP server offer out of all offers.
+ *
+ * Simply select the first offer received.
+ *
+ * @param netif the netif under DHCP control
+ * @return lwIP specific error (see error.h)
+ */
+static err_t
+dhcp_select(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+#if LWIP_NETIF_HOSTNAME
+ const char *p;
+#endif /* LWIP_NETIF_HOSTNAME */
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_select(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ dhcp_set_state(dhcp, DHCP_REQUESTING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_REQUEST);
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ /* MUST request the offered IP address */
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+
+ dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
+ dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
+ dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
+ dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
+ dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
+
+#if LWIP_NETIF_HOSTNAME
+ p = (const char*)netif->hostname;
+ if (p != NULL) {
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, strlen(p));
+ while (*p) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+#endif /* LWIP_NETIF_HOSTNAME */
+
+ dhcp_option_trailer(dhcp);
+ /* shrink the pbuf to the actual content length */
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* TODO: we really should bind to a specific local interface here
+ but we cannot specify an unconfigured netif as it is addressless */
+ /* send broadcast to any DHCP server */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ /* reconnect to any (or to server here?!) */
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ dhcp_delete_request(netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_select: REQUESTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_select: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_select(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * The DHCP timer that checks for lease renewal/rebind timeouts.
+ *
+ */
+void
+dhcp_coarse_tmr()
+{
+ struct netif *netif = netif_list;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_coarse_tmr()\n"));
+ /* iterate through all network interfaces */
+ while (netif != NULL) {
+ /* only act on DHCP configured interfaces */
+ if (netif->dhcp != NULL) {
+ /* timer is active (non zero), and triggers (zeroes) now? */
+ if (netif->dhcp->t2_timeout-- == 1) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t2 timeout\n"));
+ /* this clients' rebind timeout triggered */
+ dhcp_t2_timeout(netif);
+ /* timer is active (non zero), and triggers (zeroes) now */
+ } else if (netif->dhcp->t1_timeout-- == 1) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_coarse_tmr(): t1 timeout\n"));
+ /* this clients' renewal timeout triggered */
+ dhcp_t1_timeout(netif);
+ }
+ }
+ /* proceed to next netif */
+ netif = netif->next;
+ }
+}
+
+/**
+ * DHCP transaction timeout handling
+ *
+ * A DHCP server is expected to respond within a short period of time.
+ * This timer checks whether an outstanding DHCP request is timed out.
+ *
+ */
+void
+dhcp_fine_tmr()
+{
+ struct netif *netif = netif_list;
+ /* loop through netif's */
+ while (netif != NULL) {
+ /* only act on DHCP configured interfaces */
+ if (netif->dhcp != NULL) {
+ /* timer is active (non zero), and is about to trigger now */
+ if (netif->dhcp->request_timeout > 1) {
+ netif->dhcp->request_timeout--;
+ }
+ else if (netif->dhcp->request_timeout == 1) {
+ netif->dhcp->request_timeout--;
+ /* { netif->dhcp->request_timeout == 0 } */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_fine_tmr(): request timeout\n"));
+ /* this clients' request timeout triggered */
+ dhcp_timeout(netif);
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+}
+
+/**
+ * A DHCP negotiation transaction, or ARP request, has timed out.
+ *
+ * The timer that was started with the DHCP or ARP request has
+ * timed out, indicating no response was received in time.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_timeout()\n"));
+ /* back-off period has passed, or server selection timed out */
+ if ((dhcp->state == DHCP_BACKING_OFF) || (dhcp->state == DHCP_SELECTING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_timeout(): restarting discovery\n"));
+ dhcp_discover(netif);
+ /* receiving the requested lease timed out */
+ } else if (dhcp->state == DHCP_REQUESTING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, DHCP request timed out\n"));
+ if (dhcp->tries <= 5) {
+ dhcp_select(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REQUESTING, releasing, restarting\n"));
+ dhcp_release(netif);
+ dhcp_discover(netif);
+ }
+ /* received no ARP reply for the offered address (which is good) */
+ } else if (dhcp->state == DHCP_CHECKING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): CHECKING, ARP request timed out\n"));
+ if (dhcp->tries <= 1) {
+ dhcp_check(netif);
+ /* no ARP replies on the offered address,
+ looks like the IP address is indeed free */
+ } else {
+ /* bind the interface to the offered address */
+ dhcp_bind(netif);
+ }
+ }
+ /* did not get response to renew request? */
+ else if (dhcp->state == DHCP_RENEWING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RENEWING, DHCP request timed out\n"));
+ /* just retry renewal */
+ /* note that the rebind timer will eventually time-out if renew does not work */
+ dhcp_renew(netif);
+ /* did not get response to rebind request? */
+ } else if (dhcp->state == DHCP_REBINDING) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): REBINDING, DHCP request timed out\n"));
+ if (dhcp->tries <= 8) {
+ dhcp_rebind(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_timeout(): RELEASING, DISCOVERING\n"));
+ dhcp_release(netif);
+ dhcp_discover(netif);
+ }
+ }
+}
+
+/**
+ * The renewal period has timed out.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_t1_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_t1_timeout()\n"));
+ if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) || (dhcp->state == DHCP_RENEWING)) {
+ /* just retry to renew - note that the rebind timer (t2) will
+ * eventually time-out if renew tries fail. */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t1_timeout(): must renew\n"));
+ dhcp_renew(netif);
+ }
+}
+
+/**
+ * The rebind period has timed out.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_t2_timeout(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout()\n"));
+ if ((dhcp->state == DHCP_REQUESTING) || (dhcp->state == DHCP_BOUND) || (dhcp->state == DHCP_RENEWING)) {
+ /* just retry to rebind */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_t2_timeout(): must rebind\n"));
+ dhcp_rebind(netif);
+ }
+}
+
+/**
+ * Handle a DHCP ACK packet
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_handle_ack(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ u8_t *option_ptr;
+ /* clear options we might not get from the ACK */
+ dhcp->offered_sn_mask.addr = 0;
+ dhcp->offered_gw_addr.addr = 0;
+ dhcp->offered_bc_addr.addr = 0;
+
+ /* lease time given? */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_LEASE_TIME);
+ if (option_ptr != NULL) {
+ /* remember offered lease time */
+ dhcp->offered_t0_lease = dhcp_get_option_long(option_ptr + 2);
+ }
+ /* renewal period given? */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_T1);
+ if (option_ptr != NULL) {
+ /* remember given renewal period */
+ dhcp->offered_t1_renew = dhcp_get_option_long(option_ptr + 2);
+ } else {
+ /* calculate safe periods for renewal */
+ dhcp->offered_t1_renew = dhcp->offered_t0_lease / 2;
+ }
+
+ /* renewal period given? */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_T2);
+ if (option_ptr != NULL) {
+ /* remember given rebind period */
+ dhcp->offered_t2_rebind = dhcp_get_option_long(option_ptr + 2);
+ } else {
+ /* calculate safe periods for rebinding */
+ dhcp->offered_t2_rebind = dhcp->offered_t0_lease;
+ }
+
+ /* (y)our internet address */
+ ip_addr_set(&dhcp->offered_ip_addr, &dhcp->msg_in->yiaddr);
+
+/**
+ * Patch #1308
+ * TODO: we must check if the file field is not overloaded by DHCP options!
+ */
+#if 0
+ /* boot server address */
+ ip_addr_set(&dhcp->offered_si_addr, &dhcp->msg_in->siaddr);
+ /* boot file name */
+ if (dhcp->msg_in->file[0]) {
+ dhcp->boot_file_name = mem_malloc(strlen(dhcp->msg_in->file) + 1);
+ strcpy(dhcp->boot_file_name, dhcp->msg_in->file);
+ }
+#endif
+
+ /* subnet mask */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_SUBNET_MASK);
+ /* subnet mask given? */
+ if (option_ptr != NULL) {
+ dhcp->offered_sn_mask.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
+ }
+
+ /* gateway router */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_ROUTER);
+ if (option_ptr != NULL) {
+ dhcp->offered_gw_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
+ }
+
+ /* broadcast address */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_BROADCAST);
+ if (option_ptr != NULL) {
+ dhcp->offered_bc_addr.addr = htonl(dhcp_get_option_long(&option_ptr[2]));
+ }
+
+ /* DNS servers */
+ option_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_DNS_SERVER);
+ if (option_ptr != NULL) {
+ u8_t n;
+ dhcp->dns_count = dhcp_get_option_byte(&option_ptr[1]) / (u32_t)sizeof(struct ip_addr);
+ /* limit to at most DHCP_MAX_DNS DNS servers */
+ if (dhcp->dns_count > DHCP_MAX_DNS)
+ dhcp->dns_count = DHCP_MAX_DNS;
+ for (n = 0; n < dhcp->dns_count; n++) {
+ dhcp->offered_dns_addr[n].addr = htonl(dhcp_get_option_long(&option_ptr[2 + n * 4]));
+#if LWIP_DNS
+ dns_setserver( n, (struct ip_addr *)(&(dhcp->offered_dns_addr[n].addr)));
+#endif /* LWIP_DNS */
+ }
+#if LWIP_DNS
+ dns_setserver( n, (struct ip_addr *)(&ip_addr_any));
+#endif /* LWIP_DNS */
+ }
+}
+
+/**
+ * Start DHCP negotiation for a network interface.
+ *
+ * If no DHCP client instance was attached to this interface,
+ * a new client is created first. If a DHCP client instance
+ * was already present, it restarts negotiation.
+ *
+ * @param netif The lwIP network interface
+ * @return lwIP error code
+ * - ERR_OK - No error
+ * - ERR_MEM - Out of memory
+ */
+err_t
+dhcp_start(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ err_t result = ERR_OK;
+
+ LWIP_ERROR("netif != NULL", (netif != NULL), return ERR_ARG;);
+ dhcp = netif->dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+ /* Remove the flag that says this netif is handled by DHCP,
+ it is set when we succeeded starting. */
+ netif->flags &= ~NETIF_FLAG_DHCP;
+
+ /* check MTU of the netif */
+ if (netif->mtu < DHCP_MAX_MSG_LEN_MIN_REQUIRED) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): Cannot use this netif with DHCP: MTU is too small\n"));
+ return ERR_MEM;
+ }
+
+ /* no DHCP client attached yet? */
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting new DHCP client\n"));
+ dhcp = mem_malloc(sizeof(struct dhcp));
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not allocate dhcp\n"));
+ return ERR_MEM;
+ }
+ /* store this dhcp client in the netif */
+ netif->dhcp = dhcp;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): allocated dhcp"));
+ /* already has DHCP client attached */
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 3, ("dhcp_start(): restarting DHCP configuration\n"));
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ }
+ if (dhcp->p != NULL) {
+ pbuf_free(dhcp->p);
+ }
+ }
+
+ /* clear data structure */
+ memset(dhcp, 0, sizeof(struct dhcp));
+ /* allocate UDP PCB */
+ dhcp->pcb = udp_new();
+ if (dhcp->pcb == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): could not obtain pcb\n"));
+ mem_free((void *)dhcp);
+ netif->dhcp = dhcp = NULL;
+ return ERR_MEM;
+ }
+#if IP_SOF_BROADCAST
+ dhcp->pcb->so_options|=SOF_BROADCAST;
+#endif /* IP_SOF_BROADCAST */
+ /* set up local and remote port for the pcb */
+ udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ /* set up the recv callback and argument */
+ udp_recv(dhcp->pcb, dhcp_recv, netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_start(): starting DHCP configuration\n"));
+ /* (re)start the DHCP negotiation */
+ result = dhcp_discover(netif);
+ if (result != ERR_OK) {
+ /* free resources allocated above */
+ dhcp_stop(netif);
+ return ERR_MEM;
+ }
+ /* Set the flag that says this netif is handled by DHCP. */
+ netif->flags |= NETIF_FLAG_DHCP;
+ return result;
+}
+
+/**
+ * Inform a DHCP server of our manual configuration.
+ *
+ * This informs DHCP servers of our fixed IP address configuration
+ * by sending an INFORM message. It does not involve DHCP address
+ * configuration, it is just here to be nice to the network.
+ *
+ * @param netif The lwIP network interface
+ */
+void
+dhcp_inform(struct netif *netif)
+{
+ struct dhcp *dhcp, *old_dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ dhcp = mem_malloc(sizeof(struct dhcp));
+ if (dhcp == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_inform(): could not allocate dhcp\n"));
+ return;
+ }
+ netif->dhcp = dhcp;
+ memset(dhcp, 0, sizeof(struct dhcp));
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): allocated dhcp\n"));
+ dhcp->pcb = udp_new();
+ if (dhcp->pcb == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_inform(): could not obtain pcb"));
+ mem_free((void *)dhcp);
+ return;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_inform(): created new udp pcb\n"));
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_INFORM);
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+#if IP_SOF_BROADCAST
+ dhcp->pcb->so_options|=SOF_BROADCAST;
+#endif /* IP_SOF_BROADCAST */
+ udp_bind(dhcp->pcb, IP_ADDR_ANY, DHCP_CLIENT_PORT);
+ udp_connect(dhcp->pcb, IP_ADDR_BROADCAST, DHCP_SERVER_PORT);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_inform: INFORMING\n"));
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ dhcp_delete_request(netif);
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_inform: could not allocate DHCP request\n"));
+ }
+
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ }
+ dhcp->pcb = NULL;
+ mem_free((void *)dhcp);
+ netif->dhcp = old_dhcp;
+}
+
+#if DHCP_DOES_ARP_CHECK
+/**
+ * Match an ARP reply with the offered IP address.
+ *
+ * @param netif the network interface on which the reply was received
+ * @param addr The IP address we received a reply from
+ */
+void dhcp_arp_reply(struct netif *netif, struct ip_addr *addr)
+{
+ LWIP_ERROR("netif != NULL", (netif != NULL), return;);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_arp_reply()\n"));
+ /* is a DHCP client doing an ARP check? */
+ if ((netif->dhcp != NULL) && (netif->dhcp->state == DHCP_CHECKING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_arp_reply(): CHECKING, arp reply for 0x%08"X32_F"\n", addr->addr));
+ /* did a host respond with the address we
+ were offered by the DHCP server? */
+ if (ip_addr_cmp(addr, &netif->dhcp->offered_ip_addr)) {
+ /* we will not accept the offered address */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1, ("dhcp_arp_reply(): arp reply matched with offered address, declining\n"));
+ dhcp_decline(netif);
+ }
+ }
+}
+
+/**
+ * Decline an offered lease.
+ *
+ * Tell the DHCP server we do not accept the offered address.
+ * One reason to decline the lease is when we find out the address
+ * is already in use by another host (through ARP).
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_decline(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_decline()\n"));
+ dhcp_set_state(dhcp, DHCP_BACKING_OFF);
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_DECLINE);
+
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+
+ dhcp_option_trailer(dhcp);
+ /* resize pbuf to reflect true size of options */
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* @todo: should we really connect here? we are performing sendto() */
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ /* per section 4.4.4, broadcast DECLINE messages */
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_request(netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_decline: BACKING OFF\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_decline: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = 10*1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_decline(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+#endif
+
+
+/**
+ * Start the DHCP process, discover a DHCP server.
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_discover(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result = ERR_OK;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_discover()\n"));
+ ip_addr_set(&dhcp->offered_ip_addr, IP_ADDR_ANY);
+ dhcp_set_state(dhcp, DHCP_SELECTING);
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: making request\n"));
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_DISCOVER);
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+ dhcp_option(dhcp, DHCP_OPTION_PARAMETER_REQUEST_LIST, 4/*num options*/);
+ dhcp_option_byte(dhcp, DHCP_OPTION_SUBNET_MASK);
+ dhcp_option_byte(dhcp, DHCP_OPTION_ROUTER);
+ dhcp_option_byte(dhcp, DHCP_OPTION_BROADCAST);
+ dhcp_option_byte(dhcp, DHCP_OPTION_DNS_SERVER);
+
+ dhcp_option_trailer(dhcp);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: realloc()ing\n"));
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: sendto(DISCOVER, IP_ADDR_BROADCAST, DHCP_SERVER_PORT)\n"));
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_discover: deleting()ing\n"));
+ dhcp_delete_request(netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover: SELECTING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_discover: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->tries >= LWIP_DHCP_AUTOIP_COOP_TRIES && dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_OFF) {
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_ON;
+ autoip_start(netif);
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+ msecs = (dhcp->tries < 6 ? 1 << dhcp->tries : 60) * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_discover(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+
+/**
+ * Bind the interface to the offered IP address.
+ *
+ * @param netif network interface to bind to the offered address
+ */
+static void
+dhcp_bind(struct netif *netif)
+{
+ u32_t timeout;
+ struct dhcp *dhcp;
+ struct ip_addr sn_mask, gw_addr;
+ LWIP_ERROR("dhcp_bind: netif != NULL", (netif != NULL), return;);
+ dhcp = netif->dhcp;
+ LWIP_ERROR("dhcp_bind: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_bind(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num));
+
+ /* temporary DHCP lease? */
+ if (dhcp->offered_t1_renew != 0xffffffffUL) {
+ /* set renewal period timer */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t1 renewal timer %"U32_F" secs\n", dhcp->offered_t1_renew));
+ timeout = (dhcp->offered_t1_renew + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
+ if(timeout > 0xffff) {
+ timeout = 0xffff;
+ }
+ dhcp->t1_timeout = (u16_t)timeout;
+ if (dhcp->t1_timeout == 0) {
+ dhcp->t1_timeout = 1;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t1_renew*1000));
+ }
+ /* set renewal period timer */
+ if (dhcp->offered_t2_rebind != 0xffffffffUL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_bind(): t2 rebind timer %"U32_F" secs\n", dhcp->offered_t2_rebind));
+ timeout = (dhcp->offered_t2_rebind + DHCP_COARSE_TIMER_SECS / 2) / DHCP_COARSE_TIMER_SECS;
+ if(timeout > 0xffff) {
+ timeout = 0xffff;
+ }
+ dhcp->t2_timeout = (u16_t)timeout;
+ if (dhcp->t2_timeout == 0) {
+ dhcp->t2_timeout = 1;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_bind(): set request timeout %"U32_F" msecs\n", dhcp->offered_t2_rebind*1000));
+ }
+ /* copy offered network mask */
+ ip_addr_set(&sn_mask, &dhcp->offered_sn_mask);
+
+ /* subnet mask not given? */
+ /* TODO: this is not a valid check. what if the network mask is 0? */
+ if (sn_mask.addr == 0) {
+ /* choose a safe subnet mask given the network class */
+ u8_t first_octet = ip4_addr1(&sn_mask);
+ if (first_octet <= 127) {
+ sn_mask.addr = htonl(0xff000000);
+ } else if (first_octet >= 192) {
+ sn_mask.addr = htonl(0xffffff00);
+ } else {
+ sn_mask.addr = htonl(0xffff0000);
+ }
+ }
+
+ ip_addr_set(&gw_addr, &dhcp->offered_gw_addr);
+ /* gateway address not given? */
+ if (gw_addr.addr == 0) {
+ /* copy network address */
+ gw_addr.addr = (dhcp->offered_ip_addr.addr & sn_mask.addr);
+ /* use first host address on network as gateway */
+ gw_addr.addr |= htonl(0x00000001);
+ }
+
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): IP: 0x%08"X32_F"\n", dhcp->offered_ip_addr.addr));
+ netif_set_ipaddr(netif, &dhcp->offered_ip_addr);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): SN: 0x%08"X32_F"\n", sn_mask.addr));
+ netif_set_netmask(netif, &sn_mask);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_STATE, ("dhcp_bind(): GW: 0x%08"X32_F"\n", gw_addr.addr));
+ netif_set_gw(netif, &gw_addr);
+ /* bring the interface up */
+ netif_set_up(netif);
+ /* netif is now bound to DHCP leased address */
+ dhcp_set_state(dhcp, DHCP_BOUND);
+}
+
+/**
+ * Renew an existing DHCP lease at the involved DHCP server.
+ *
+ * @param netif network interface which must renew its lease
+ */
+err_t
+dhcp_renew(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+#if LWIP_NETIF_HOSTNAME
+ const char *p;
+#endif /* LWIP_NETIF_HOSTNAME */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_renew()\n"));
+ dhcp_set_state(dhcp, DHCP_RENEWING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_REQUEST);
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+#if LWIP_NETIF_HOSTNAME
+ p = (const char*)netif->hostname;
+ if (p != NULL) {
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, strlen(p));
+ while (*p) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+#endif /* LWIP_NETIF_HOSTNAME */
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+#endif
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+#endif
+ /* append DHCP message trailer */
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_connect(dhcp->pcb, &dhcp->server_ip_addr, DHCP_SERVER_PORT);
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
+ dhcp_delete_request(netif);
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew: RENEWING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_renew: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ /* back-off on retries, but to a maximum of 20 seconds */
+ msecs = dhcp->tries < 10 ? dhcp->tries * 2000 : 20 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_renew(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * Rebind with a DHCP server for an existing DHCP lease.
+ *
+ * @param netif network interface which must rebind with a DHCP server
+ */
+static err_t
+dhcp_rebind(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+#if LWIP_NETIF_HOSTNAME
+ const char *p;
+#endif /* LWIP_NETIF_HOSTNAME */
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind()\n"));
+ dhcp_set_state(dhcp, DHCP_REBINDING);
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_REQUEST);
+
+ dhcp_option(dhcp, DHCP_OPTION_MAX_MSG_SIZE, DHCP_OPTION_MAX_MSG_SIZE_LEN);
+ dhcp_option_short(dhcp, DHCP_MAX_MSG_LEN(netif));
+
+#if LWIP_NETIF_HOSTNAME
+ p = (const char*)netif->hostname;
+ if (p != NULL) {
+ dhcp_option(dhcp, DHCP_OPTION_HOSTNAME, strlen(p));
+ while (*p) {
+ dhcp_option_byte(dhcp, *p++);
+ }
+ }
+#endif /* LWIP_NETIF_HOSTNAME */
+
+#if 0
+ dhcp_option(dhcp, DHCP_OPTION_REQUESTED_IP, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->offered_ip_addr.addr));
+
+ dhcp_option(dhcp, DHCP_OPTION_SERVER_ID, 4);
+ dhcp_option_long(dhcp, ntohl(dhcp->server_ip_addr.addr));
+#endif
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ /* broadcast to server */
+ udp_connect(dhcp->pcb, IP_ADDR_ANY, DHCP_SERVER_PORT);
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, IP_ADDR_BROADCAST, DHCP_SERVER_PORT, netif);
+ dhcp_delete_request(netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind: REBINDING\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_rebind: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_rebind(): set request timeout %"U16_F" msecs\n", msecs));
+ return result;
+}
+
+/**
+ * Release a DHCP lease.
+ *
+ * @param netif network interface which must release its lease
+ */
+err_t
+dhcp_release(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ err_t result;
+ u16_t msecs;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_release()\n"));
+
+ /* idle DHCP client */
+ dhcp_set_state(dhcp, DHCP_OFF);
+ /* clean old DHCP offer */
+ dhcp->server_ip_addr.addr = 0;
+ dhcp->offered_ip_addr.addr = dhcp->offered_sn_mask.addr = 0;
+ dhcp->offered_gw_addr.addr = dhcp->offered_bc_addr.addr = 0;
+ dhcp->offered_t0_lease = dhcp->offered_t1_renew = dhcp->offered_t2_rebind = 0;
+ dhcp->dns_count = 0;
+
+ /* create and initialize the DHCP message header */
+ result = dhcp_create_request(netif);
+ if (result == ERR_OK) {
+ dhcp_option(dhcp, DHCP_OPTION_MESSAGE_TYPE, DHCP_OPTION_MESSAGE_TYPE_LEN);
+ dhcp_option_byte(dhcp, DHCP_RELEASE);
+
+ dhcp_option_trailer(dhcp);
+
+ pbuf_realloc(dhcp->p_out, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN + dhcp->options_out_len);
+
+ udp_connect(dhcp->pcb, &dhcp->server_ip_addr, DHCP_SERVER_PORT);
+ udp_sendto_if(dhcp->pcb, dhcp->p_out, &dhcp->server_ip_addr, DHCP_SERVER_PORT, netif);
+ dhcp_delete_request(netif);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release: RELEASED, DHCP_OFF\n"));
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_release: could not allocate DHCP request\n"));
+ }
+ dhcp->tries++;
+ msecs = dhcp->tries < 10 ? dhcp->tries * 1000 : 10 * 1000;
+ dhcp->request_timeout = (msecs + DHCP_FINE_TIMER_MSECS - 1) / DHCP_FINE_TIMER_MSECS;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("dhcp_release(): set request timeout %"U16_F" msecs\n", msecs));
+ /* bring the interface down */
+ netif_set_down(netif);
+ /* remove IP address from interface */
+ netif_set_ipaddr(netif, IP_ADDR_ANY);
+ netif_set_gw(netif, IP_ADDR_ANY);
+ netif_set_netmask(netif, IP_ADDR_ANY);
+
+ /* TODO: netif_down(netif); */
+ return result;
+}
+
+/**
+ * Remove the DHCP client from the interface.
+ *
+ * @param netif The network interface to stop DHCP on
+ */
+void
+dhcp_stop(struct netif *netif)
+{
+ struct dhcp *dhcp = netif->dhcp;
+ LWIP_ERROR("dhcp_stop: netif != NULL", (netif != NULL), return;);
+ /* Remove the flag that says this netif is handled by DHCP. */
+ netif->flags &= ~NETIF_FLAG_DHCP;
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_stop()\n"));
+ /* netif is DHCP configured? */
+ if (dhcp != NULL) {
+#if LWIP_DHCP_AUTOIP_COOP
+ if(dhcp->autoip_coop_state == DHCP_AUTOIP_COOP_STATE_ON) {
+ autoip_stop(netif);
+ dhcp->autoip_coop_state = DHCP_AUTOIP_COOP_STATE_OFF;
+ }
+#endif /* LWIP_DHCP_AUTOIP_COOP */
+
+ if (dhcp->pcb != NULL) {
+ udp_remove(dhcp->pcb);
+ dhcp->pcb = NULL;
+ }
+ if (dhcp->p != NULL) {
+ pbuf_free(dhcp->p);
+ dhcp->p = NULL;
+ }
+ /* free unfolded reply */
+ dhcp_free_reply(dhcp);
+ mem_free((void *)dhcp);
+ netif->dhcp = NULL;
+ }
+}
+
+/*
+ * Set the DHCP state of a DHCP client.
+ *
+ * If the state changed, reset the number of tries.
+ *
+ * TODO: we might also want to reset the timeout here?
+ */
+static void
+dhcp_set_state(struct dhcp *dhcp, u8_t new_state)
+{
+ if (new_state != dhcp->state) {
+ dhcp->state = new_state;
+ dhcp->tries = 0;
+ }
+}
+
+/*
+ * Concatenate an option type and length field to the outgoing
+ * DHCP message.
+ *
+ */
+static void
+dhcp_option(struct dhcp *dhcp, u8_t option_type, u8_t option_len)
+{
+ LWIP_ASSERT("dhcp_option: dhcp->options_out_len + 2 + option_len <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U + option_len <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = option_type;
+ dhcp->msg_out->options[dhcp->options_out_len++] = option_len;
+}
+/*
+ * Concatenate a single byte to the outgoing DHCP message.
+ *
+ */
+static void
+dhcp_option_byte(struct dhcp *dhcp, u8_t value)
+{
+ LWIP_ASSERT("dhcp_option_byte: dhcp->options_out_len < DHCP_OPTIONS_LEN", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = value;
+}
+
+static void
+dhcp_option_short(struct dhcp *dhcp, u16_t value)
+{
+ LWIP_ASSERT("dhcp_option_short: dhcp->options_out_len + 2 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 2U <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff00U) >> 8);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t) (value & 0x00ffU);
+}
+
+static void
+dhcp_option_long(struct dhcp *dhcp, u32_t value)
+{
+ LWIP_ASSERT("dhcp_option_long: dhcp->options_out_len + 4 <= DHCP_OPTIONS_LEN", dhcp->options_out_len + 4U <= DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0xff000000UL) >> 24);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x00ff0000UL) >> 16);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x0000ff00UL) >> 8);
+ dhcp->msg_out->options[dhcp->options_out_len++] = (u8_t)((value & 0x000000ffUL));
+}
+
+/**
+ * Extract the DHCP message and the DHCP options.
+ *
+ * Extract the DHCP message and the DHCP options, each into a contiguous
+ * piece of memory. As a DHCP message is variable sized by its options,
+ * and also allows overriding some fields for options, the easy approach
+ * is to first unfold the options into a conitguous piece of memory, and
+ * use that further on.
+ *
+ */
+static err_t
+dhcp_unfold_reply(struct dhcp *dhcp)
+{
+ u16_t ret;
+ LWIP_ERROR("dhcp != NULL", (dhcp != NULL), return ERR_ARG;);
+ LWIP_ERROR("dhcp->p != NULL", (dhcp->p != NULL), return ERR_VAL;);
+ /* free any left-overs from previous unfolds */
+ dhcp_free_reply(dhcp);
+ /* options present? */
+ if (dhcp->p->tot_len > (sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN)) {
+ dhcp->options_in_len = dhcp->p->tot_len - (sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
+ dhcp->options_in = mem_malloc(dhcp->options_in_len);
+ if (dhcp->options_in == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_unfold_reply(): could not allocate dhcp->options\n"));
+ return ERR_MEM;
+ }
+ }
+ dhcp->msg_in = mem_malloc(sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
+ if (dhcp->msg_in == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_unfold_reply(): could not allocate dhcp->msg_in\n"));
+ mem_free((void *)dhcp->options_in);
+ dhcp->options_in = NULL;
+ return ERR_MEM;
+ }
+
+ /** copy the DHCP message without options */
+ ret = pbuf_copy_partial(dhcp->p, dhcp->msg_in, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN, 0);
+ LWIP_ASSERT("ret == sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN", ret == sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_unfold_reply(): copied %"U16_F" bytes into dhcp->msg_in[]\n",
+ sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN));
+
+ if (dhcp->options_in != NULL) {
+ /** copy the DHCP options */
+ ret = pbuf_copy_partial(dhcp->p, dhcp->options_in, dhcp->options_in_len, sizeof(struct dhcp_msg) - DHCP_OPTIONS_LEN);
+ LWIP_ASSERT("ret == dhcp->options_in_len", ret == dhcp->options_in_len);
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_unfold_reply(): copied %"U16_F" bytes to dhcp->options_in[]\n",
+ dhcp->options_in_len));
+ }
+ LWIP_UNUSED_ARG(ret);
+ return ERR_OK;
+}
+
+/**
+ * Free the incoming DHCP message including contiguous copy of
+ * its DHCP options.
+ *
+ */
+static void dhcp_free_reply(struct dhcp *dhcp)
+{
+ if (dhcp->msg_in != NULL) {
+ mem_free((void *)dhcp->msg_in);
+ dhcp->msg_in = NULL;
+ }
+ if (dhcp->options_in) {
+ mem_free((void *)dhcp->options_in);
+ dhcp->options_in = NULL;
+ dhcp->options_in_len = 0;
+ }
+ LWIP_DEBUGF(DHCP_DEBUG, ("dhcp_free_reply(): free'd\n"));
+}
+
+
+/**
+ * If an incoming DHCP message is in response to us, then trigger the state machine
+ */
+static void dhcp_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
+{
+ struct netif *netif = (struct netif *)arg;
+ struct dhcp *dhcp = netif->dhcp;
+ struct dhcp_msg *reply_msg = (struct dhcp_msg *)p->payload;
+ u8_t *options_ptr;
+ u8_t msg_type;
+ u8_t i;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 3, ("dhcp_recv(pbuf = %p) from DHCP server %"U16_F".%"U16_F".%"U16_F".%"U16_F" port %"U16_F"\n", (void*)p,
+ (u16_t)(ntohl(addr->addr) >> 24 & 0xff), (u16_t)(ntohl(addr->addr) >> 16 & 0xff),
+ (u16_t)(ntohl(addr->addr) >> 8 & 0xff), (u16_t)(ntohl(addr->addr) & 0xff), port));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->len = %"U16_F"\n", p->len));
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("pbuf->tot_len = %"U16_F"\n", p->tot_len));
+ /* prevent warnings about unused arguments */
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(addr);
+ LWIP_UNUSED_ARG(port);
+ dhcp->p = p;
+ /* TODO: check packet length before reading them */
+ if (reply_msg->op != DHCP_BOOTREPLY) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("not a DHCP reply message, but type %"U16_F"\n", (u16_t)reply_msg->op));
+ goto free_pbuf_and_return;
+ }
+ /* iterate through hardware address and match against DHCP message */
+ for (i = 0; i < netif->hwaddr_len; i++) {
+ if (netif->hwaddr[i] != reply_msg->chaddr[i]) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("netif->hwaddr[%"U16_F"]==%02"X16_F" != reply_msg->chaddr[%"U16_F"]==%02"X16_F"\n",
+ (u16_t)i, (u16_t)netif->hwaddr[i], (u16_t)i, (u16_t)reply_msg->chaddr[i]));
+ goto free_pbuf_and_return;
+ }
+ }
+ /* match transaction ID against what we expected */
+ if (ntohl(reply_msg->xid) != dhcp->xid) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("transaction id mismatch reply_msg->xid(%"X32_F")!=dhcp->xid(%"X32_F")\n",ntohl(reply_msg->xid),dhcp->xid));
+ goto free_pbuf_and_return;
+ }
+ /* option fields could be unfold? */
+ if (dhcp_unfold_reply(dhcp) != ERR_OK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("problem unfolding DHCP message - too short on memory?\n"));
+ goto free_pbuf_and_return;
+ }
+
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("searching DHCP_OPTION_MESSAGE_TYPE\n"));
+ /* obtain pointer to DHCP message type */
+ options_ptr = dhcp_get_option_ptr(dhcp, DHCP_OPTION_MESSAGE_TYPE);
+ if (options_ptr == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_OPTION_MESSAGE_TYPE option not found\n"));
+ goto free_pbuf_and_return;
+ }
+
+ /* read DHCP message type */
+ msg_type = dhcp_get_option_byte(options_ptr + 2);
+ /* message type is DHCP ACK? */
+ if (msg_type == DHCP_ACK) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_ACK received\n"));
+ /* in requesting state? */
+ if (dhcp->state == DHCP_REQUESTING) {
+ dhcp_handle_ack(netif);
+ dhcp->request_timeout = 0;
+#if DHCP_DOES_ARP_CHECK
+ /* check if the acknowledged lease address is already in use */
+ dhcp_check(netif);
+#else
+ /* bind interface to the acknowledged lease address */
+ dhcp_bind(netif);
+#endif
+ }
+ /* already bound to the given lease address? */
+ else if ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING)) {
+ dhcp->request_timeout = 0;
+ dhcp_bind(netif);
+ }
+ }
+ /* received a DHCP_NAK in appropriate state? */
+ else if ((msg_type == DHCP_NAK) &&
+ ((dhcp->state == DHCP_REBOOTING) || (dhcp->state == DHCP_REQUESTING) ||
+ (dhcp->state == DHCP_REBINDING) || (dhcp->state == DHCP_RENEWING ))) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_NAK received\n"));
+ dhcp->request_timeout = 0;
+ dhcp_handle_nak(netif);
+ }
+ /* received a DHCP_OFFER in DHCP_SELECTING state? */
+ else if ((msg_type == DHCP_OFFER) && (dhcp->state == DHCP_SELECTING)) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("DHCP_OFFER received in DHCP_SELECTING state\n"));
+ dhcp->request_timeout = 0;
+ /* remember offered lease */
+ dhcp_handle_offer(netif);
+ }
+free_pbuf_and_return:
+ dhcp_free_reply(dhcp);
+ pbuf_free(p);
+ dhcp->p = NULL;
+}
+
+/**
+ * Create a DHCP request, fill in common headers
+ *
+ * @param netif the netif under DHCP control
+ */
+static err_t
+dhcp_create_request(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ u16_t i;
+#ifndef DHCP_GLOBAL_XID
+ /** default global transaction identifier starting value (easy to match
+ * with a packet analyser). We simply increment for each new request.
+ * Predefine DHCP_GLOBAL_XID to a better value or a function call to generate one
+ * at runtime, any supporting function prototypes can be defined in DHCP_GLOBAL_XID_HEADER */
+ static u32_t xid = 0xABCD0000;
+#else
+ static u32_t xid;
+ static u8_t xid_initialised = 0;
+ if (!xid_initialised) {
+ xid = DHCP_GLOBAL_XID;
+ xid_initialised = !xid_initialised;
+ }
+#endif
+ LWIP_ERROR("dhcp_create_request: netif != NULL", (netif != NULL), return ERR_ARG;);
+ dhcp = netif->dhcp;
+ LWIP_ERROR("dhcp_create_request: dhcp != NULL", (dhcp != NULL), return ERR_VAL;);
+ LWIP_ASSERT("dhcp_create_request: dhcp->p_out == NULL", dhcp->p_out == NULL);
+ LWIP_ASSERT("dhcp_create_request: dhcp->msg_out == NULL", dhcp->msg_out == NULL);
+ dhcp->p_out = pbuf_alloc(PBUF_TRANSPORT, sizeof(struct dhcp_msg), PBUF_RAM);
+ if (dhcp->p_out == NULL) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("dhcp_create_request(): could not allocate pbuf\n"));
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("dhcp_create_request: check that first pbuf can hold struct dhcp_msg",
+ (dhcp->p_out->len >= sizeof(struct dhcp_msg)));
+
+ /* reuse transaction identifier in retransmissions */
+ if (dhcp->tries==0)
+ xid++;
+ dhcp->xid = xid;
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2,
+ ("transaction id xid(%"X32_F")\n", xid));
+
+ dhcp->msg_out = (struct dhcp_msg *)dhcp->p_out->payload;
+
+ dhcp->msg_out->op = DHCP_BOOTREQUEST;
+ /* TODO: make link layer independent */
+ dhcp->msg_out->htype = DHCP_HTYPE_ETH;
+ /* TODO: make link layer independent */
+ dhcp->msg_out->hlen = DHCP_HLEN_ETH;
+ dhcp->msg_out->hops = 0;
+ dhcp->msg_out->xid = htonl(dhcp->xid);
+ dhcp->msg_out->secs = 0;
+ dhcp->msg_out->flags = 0;
+ dhcp->msg_out->ciaddr.addr = 0;
+ if (dhcp->state==DHCP_BOUND || dhcp->state==DHCP_RENEWING || dhcp->state==DHCP_REBINDING) {
+ dhcp->msg_out->ciaddr.addr = netif->ip_addr.addr;
+ }
+ dhcp->msg_out->yiaddr.addr = 0;
+ dhcp->msg_out->siaddr.addr = 0;
+ dhcp->msg_out->giaddr.addr = 0;
+ for (i = 0; i < DHCP_CHADDR_LEN; i++) {
+ /* copy netif hardware address, pad with zeroes */
+ dhcp->msg_out->chaddr[i] = (i < netif->hwaddr_len) ? netif->hwaddr[i] : 0/* pad byte*/;
+ }
+ for (i = 0; i < DHCP_SNAME_LEN; i++) {
+ dhcp->msg_out->sname[i] = 0;
+ }
+ for (i = 0; i < DHCP_FILE_LEN; i++) {
+ dhcp->msg_out->file[i] = 0;
+ }
+ dhcp->msg_out->cookie = htonl(0x63825363UL);
+ dhcp->options_out_len = 0;
+ /* fill options field with an incrementing array (for debugging purposes) */
+ for (i = 0; i < DHCP_OPTIONS_LEN; i++) {
+ dhcp->msg_out->options[i] = (u8_t)i; /* for debugging only, no matter if truncated */
+ }
+ return ERR_OK;
+}
+
+/**
+ * Free previously allocated memory used to send a DHCP request.
+ *
+ * @param netif the netif under DHCP control
+ */
+static void
+dhcp_delete_request(struct netif *netif)
+{
+ struct dhcp *dhcp;
+ LWIP_ERROR("dhcp_delete_request: netif != NULL", (netif != NULL), return;);
+ dhcp = netif->dhcp;
+ LWIP_ERROR("dhcp_delete_request: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_ASSERT("dhcp_delete_request: dhcp->p_out != NULL", dhcp->p_out != NULL);
+ LWIP_ASSERT("dhcp_delete_request: dhcp->msg_out != NULL", dhcp->msg_out != NULL);
+ if (dhcp->p_out != NULL) {
+ pbuf_free(dhcp->p_out);
+ }
+ dhcp->p_out = NULL;
+ dhcp->msg_out = NULL;
+}
+
+/**
+ * Add a DHCP message trailer
+ *
+ * Adds the END option to the DHCP message, and if
+ * necessary, up to three padding bytes.
+ *
+ * @param dhcp DHCP state structure
+ */
+static void
+dhcp_option_trailer(struct dhcp *dhcp)
+{
+ LWIP_ERROR("dhcp_option_trailer: dhcp != NULL", (dhcp != NULL), return;);
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->msg_out != NULL\n", dhcp->msg_out != NULL);
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ dhcp->msg_out->options[dhcp->options_out_len++] = DHCP_OPTION_END;
+ /* packet is too small, or not 4 byte aligned? */
+ while ((dhcp->options_out_len < DHCP_MIN_OPTIONS_LEN) || (dhcp->options_out_len & 3)) {
+ /* LWIP_DEBUGF(DHCP_DEBUG,("dhcp_option_trailer:dhcp->options_out_len=%"U16_F", DHCP_OPTIONS_LEN=%"U16_F, dhcp->options_out_len, DHCP_OPTIONS_LEN)); */
+ LWIP_ASSERT("dhcp_option_trailer: dhcp->options_out_len < DHCP_OPTIONS_LEN\n", dhcp->options_out_len < DHCP_OPTIONS_LEN);
+ /* add a fill/padding byte */
+ dhcp->msg_out->options[dhcp->options_out_len++] = 0;
+ }
+}
+
+/**
+ * Find the offset of a DHCP option inside the DHCP message.
+ *
+ * @param dhcp DHCP client
+ * @param option_type
+ *
+ * @return a byte offset into the UDP message where the option was found, or
+ * zero if the given option was not found.
+ */
+static u8_t *dhcp_get_option_ptr(struct dhcp *dhcp, u8_t option_type)
+{
+ u8_t overload = DHCP_OVERLOAD_NONE;
+
+ /* options available? */
+ if ((dhcp->options_in != NULL) && (dhcp->options_in_len > 0)) {
+ /* start with options field */
+ u8_t *options = (u8_t *)dhcp->options_in;
+ u16_t offset = 0;
+ /* at least 1 byte to read and no end marker, then at least 3 bytes to read? */
+ while ((offset < dhcp->options_in_len) && (options[offset] != DHCP_OPTION_END)) {
+ /* LWIP_DEBUGF(DHCP_DEBUG, ("msg_offset=%"U16_F", q->len=%"U16_F, msg_offset, q->len)); */
+ /* are the sname and/or file field overloaded with options? */
+ if (options[offset] == DHCP_OPTION_OVERLOAD) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 2, ("overloaded message detected\n"));
+ /* skip option type and length */
+ offset += 2;
+ overload = options[offset++];
+ }
+ /* requested option found */
+ else if (options[offset] == option_type) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("option found at offset %"U16_F" in options\n", offset));
+ return &options[offset];
+ /* skip option */
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG, ("skipping option %"U16_F" in options\n", options[offset]));
+ /* skip option type */
+ offset++;
+ /* skip option length, and then length bytes */
+ offset += 1 + options[offset];
+ }
+ }
+ /* is this an overloaded message? */
+ if (overload != DHCP_OVERLOAD_NONE) {
+ u16_t field_len;
+ if (overload == DHCP_OVERLOAD_FILE) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("overloaded file field\n"));
+ options = (u8_t *)&dhcp->msg_in->file;
+ field_len = DHCP_FILE_LEN;
+ } else if (overload == DHCP_OVERLOAD_SNAME) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("overloaded sname field\n"));
+ options = (u8_t *)&dhcp->msg_in->sname;
+ field_len = DHCP_SNAME_LEN;
+ /* TODO: check if else if () is necessary */
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE | 1, ("overloaded sname and file field\n"));
+ options = (u8_t *)&dhcp->msg_in->sname;
+ field_len = DHCP_FILE_LEN + DHCP_SNAME_LEN;
+ }
+ offset = 0;
+
+ /* at least 1 byte to read and no end marker */
+ while ((offset < field_len) && (options[offset] != DHCP_OPTION_END)) {
+ if (options[offset] == option_type) {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("option found at offset=%"U16_F"\n", offset));
+ return &options[offset];
+ /* skip option */
+ } else {
+ LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("skipping option %"U16_F"\n", options[offset]));
+ /* skip option type */
+ offset++;
+ offset += 1 + options[offset];
+ }
+ }
+ }
+ }
+ return NULL;
+}
+
+/**
+ * Return the byte of DHCP option data.
+ *
+ * @param client DHCP client.
+ * @param ptr pointer obtained by dhcp_get_option_ptr().
+ *
+ * @return byte value at the given address.
+ */
+static u8_t
+dhcp_get_option_byte(u8_t *ptr)
+{
+ LWIP_DEBUGF(DHCP_DEBUG, ("option byte value=%"U16_F"\n", (u16_t)(*ptr)));
+ return *ptr;
+}
+
+#if 0 /* currently unused */
+/**
+ * Return the 16-bit value of DHCP option data.
+ *
+ * @param client DHCP client.
+ * @param ptr pointer obtained by dhcp_get_option_ptr().
+ *
+ * @return byte value at the given address.
+ */
+static u16_t
+dhcp_get_option_short(u8_t *ptr)
+{
+ u16_t value;
+ value = *ptr++ << 8;
+ value |= *ptr;
+ LWIP_DEBUGF(DHCP_DEBUG, ("option short value=%"U16_F"\n", value));
+ return value;
+}
+#endif
+
+/**
+ * Return the 32-bit value of DHCP option data.
+ *
+ * @param client DHCP client.
+ * @param ptr pointer obtained by dhcp_get_option_ptr().
+ *
+ * @return byte value at the given address.
+ */
+static u32_t dhcp_get_option_long(u8_t *ptr)
+{
+ u32_t value;
+ value = (u32_t)(*ptr++) << 24;
+ value |= (u32_t)(*ptr++) << 16;
+ value |= (u32_t)(*ptr++) << 8;
+ value |= (u32_t)(*ptr++);
+ LWIP_DEBUGF(DHCP_DEBUG, ("option long value=%"U32_F"\n", value));
+ return value;
+}
+
+#endif /* LWIP_DHCP */
diff --git a/core/lwip/src/core/dns.c b/core/lwip/src/core/dns.c
new file mode 100644
index 00000000..62a2592e
--- /dev/null
+++ b/core/lwip/src/core/dns.c
@@ -0,0 +1,980 @@
+/**
+ * @file
+ * DNS - host name to IP address resolver.
+ *
+ */
+
+/**
+
+ * This file implements a DNS host name to IP address resolver.
+
+ * Port to lwIP from uIP
+ * by Jim Pettinato April 2007
+
+ * uIP version Copyright (c) 2002-2003, Adam Dunkels.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *
+ * DNS.C
+ *
+ * The lwIP DNS resolver functions are used to lookup a host name and
+ * map it to a numerical IP address. It maintains a list of resolved
+ * hostnames that can be queried with the dns_lookup() function.
+ * New hostnames can be resolved using the dns_query() function.
+ *
+ * The lwIP version of the resolver also adds a non-blocking version of
+ * gethostbyname() that will work with a raw API application. This function
+ * checks for an IP address string first and converts it if it is valid.
+ * gethostbyname() then does a dns_lookup() to see if the name is
+ * already in the table. If so, the IP is returned. If not, a query is
+ * issued and the function returns with a ERR_INPROGRESS status. The app
+ * using the dns client must then go into a waiting state.
+ *
+ * Once a hostname has been resolved (or found to be non-existent),
+ * the resolver code calls a specified callback function (which
+ * must be implemented by the module that uses the resolver).
+ */
+
+/*-----------------------------------------------------------------------------
+ * RFC 1035 - Domain names - implementation and specification
+ * RFC 2181 - Clarifications to the DNS Specification
+ *----------------------------------------------------------------------------*/
+
+/** @todo: define good default values (rfc compliance) */
+/** @todo: improve answer parsing, more checkings... */
+/** @todo: check RFC1035 - 7.3. Processing responses */
+
+/*-----------------------------------------------------------------------------
+ * Includes
+ *----------------------------------------------------------------------------*/
+
+#include "lwip/opt.h"
+
+#if LWIP_DNS /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/udp.h"
+#include "lwip/mem.h"
+#include "lwip/dns.h"
+
+#include <string.h>
+
+/** DNS server IP address */
+#ifndef DNS_SERVER_ADDRESS
+#define DNS_SERVER_ADDRESS inet_addr("208.67.222.222") /* resolver1.opendns.com */
+#endif
+
+/** DNS server port address */
+#ifndef DNS_SERVER_PORT
+#define DNS_SERVER_PORT 53
+#endif
+
+/** DNS maximum number of retries when asking for a name, before "timeout". */
+#ifndef DNS_MAX_RETRIES
+#define DNS_MAX_RETRIES 4
+#endif
+
+/** DNS resource record max. TTL (one week as default) */
+#ifndef DNS_MAX_TTL
+#define DNS_MAX_TTL 604800
+#endif
+
+/* DNS protocol flags */
+#define DNS_FLAG1_RESPONSE 0x80
+#define DNS_FLAG1_OPCODE_STATUS 0x10
+#define DNS_FLAG1_OPCODE_INVERSE 0x08
+#define DNS_FLAG1_OPCODE_STANDARD 0x00
+#define DNS_FLAG1_AUTHORATIVE 0x04
+#define DNS_FLAG1_TRUNC 0x02
+#define DNS_FLAG1_RD 0x01
+#define DNS_FLAG2_RA 0x80
+#define DNS_FLAG2_ERR_MASK 0x0f
+#define DNS_FLAG2_ERR_NONE 0x00
+#define DNS_FLAG2_ERR_NAME 0x03
+
+/* DNS protocol states */
+#define DNS_STATE_UNUSED 0
+#define DNS_STATE_NEW 1
+#define DNS_STATE_ASKING 2
+#define DNS_STATE_DONE 3
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** DNS message header */
+struct dns_hdr {
+ PACK_STRUCT_FIELD(u16_t id);
+ PACK_STRUCT_FIELD(u8_t flags1);
+ PACK_STRUCT_FIELD(u8_t flags2);
+ PACK_STRUCT_FIELD(u16_t numquestions);
+ PACK_STRUCT_FIELD(u16_t numanswers);
+ PACK_STRUCT_FIELD(u16_t numauthrr);
+ PACK_STRUCT_FIELD(u16_t numextrarr);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+#define SIZEOF_DNS_HDR 12
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** DNS query message structure */
+struct dns_query {
+ /* DNS query record starts with either a domain name or a pointer
+ to a name already present somewhere in the packet. */
+ PACK_STRUCT_FIELD(u16_t type);
+ PACK_STRUCT_FIELD(u16_t class);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+#define SIZEOF_DNS_QUERY 4
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+/** DNS answer message structure */
+struct dns_answer {
+ /* DNS answer record starts with either a domain name or a pointer
+ to a name already present somewhere in the packet. */
+ PACK_STRUCT_FIELD(u16_t type);
+ PACK_STRUCT_FIELD(u16_t class);
+ PACK_STRUCT_FIELD(u32_t ttl);
+ PACK_STRUCT_FIELD(u16_t len);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+#define SIZEOF_DNS_ANSWER 10
+
+/** DNS table entry */
+struct dns_table_entry {
+ u8_t state;
+ u8_t numdns;
+ u8_t tmr;
+ u8_t retries;
+ u8_t seqno;
+ u8_t err;
+ u32_t ttl;
+ char name[DNS_MAX_NAME_LENGTH];
+ struct ip_addr ipaddr;
+ /* pointer to callback on DNS query done */
+ dns_found_callback found;
+ void *arg;
+};
+
+#if DNS_LOCAL_HOSTLIST
+/** struct used for local host-list */
+struct local_hostlist_entry {
+ /** static hostname */
+ const char *name;
+ /** static host address in network byteorder */
+ u32_t addr;
+ struct local_hostlist_entry *next;
+};
+
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+/** Local host-list. For hostnames in this list, no
+ * external name resolution is performed */
+static struct local_hostlist_entry *local_hostlist_dynamic;
+#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+
+/** Defining this allows the local_hostlist_static to be placed in a different
+ * linker section (e.g. FLASH) */
+#ifndef DNS_LOCAL_HOSTLIST_STORAGE_PRE
+#define DNS_LOCAL_HOSTLIST_STORAGE_PRE static
+#endif /* DNS_LOCAL_HOSTLIST_STORAGE_PRE */
+/** Defining this allows the local_hostlist_static to be placed in a different
+ * linker section (e.g. FLASH) */
+#ifndef DNS_LOCAL_HOSTLIST_STORAGE_POST
+#define DNS_LOCAL_HOSTLIST_STORAGE_POST
+#endif /* DNS_LOCAL_HOSTLIST_STORAGE_POST */
+DNS_LOCAL_HOSTLIST_STORAGE_PRE struct local_hostlist_entry local_hostlist_static[]
+ DNS_LOCAL_HOSTLIST_STORAGE_POST = DNS_LOCAL_HOSTLIST_INIT;
+
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+
+static void dns_init_local();
+#endif /* DNS_LOCAL_HOSTLIST */
+
+
+/* forward declarations */
+static void dns_recv(void *s, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port);
+static void dns_check_entries(void);
+
+/*-----------------------------------------------------------------------------
+ * Globales
+ *----------------------------------------------------------------------------*/
+
+/* DNS variables */
+static struct udp_pcb *dns_pcb;
+static u8_t dns_seqno;
+static struct dns_table_entry dns_table[DNS_TABLE_SIZE];
+static struct ip_addr dns_servers[DNS_MAX_SERVERS];
+
+#if (DNS_USES_STATIC_BUF == 1)
+static u8_t dns_payload[DNS_MSG_SIZE];
+#endif /* (DNS_USES_STATIC_BUF == 1) */
+
+/**
+ * Initialize the resolver: set up the UDP pcb and configure the default server
+ * (DNS_SERVER_ADDRESS).
+ */
+void
+dns_init()
+{
+ struct ip_addr dnsserver;
+
+ /* initialize default DNS server address */
+ dnsserver.addr = DNS_SERVER_ADDRESS;
+
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_init: initializing\n"));
+
+ /* if dns client not yet initialized... */
+ if (dns_pcb == NULL) {
+ dns_pcb = udp_new();
+
+ if (dns_pcb != NULL) {
+ /* initialize DNS table not needed (initialized to zero since it is a
+ * global variable) */
+ LWIP_ASSERT("For implicit initialization to work, DNS_STATE_UNUSED needs to be 0",
+ DNS_STATE_UNUSED == 0);
+
+ /* initialize DNS client */
+ udp_bind(dns_pcb, IP_ADDR_ANY, 0);
+ udp_recv(dns_pcb, dns_recv, NULL);
+
+ /* initialize default DNS primary server */
+ dns_setserver(0, &dnsserver);
+ }
+ }
+#if DNS_LOCAL_HOSTLIST
+ dns_init_local();
+#endif
+}
+
+/**
+ * Initialize one of the DNS servers.
+ *
+ * @param numdns the index of the DNS server to set must be < DNS_MAX_SERVERS
+ * @param dnsserver IP address of the DNS server to set
+ */
+void
+dns_setserver(u8_t numdns, struct ip_addr *dnsserver)
+{
+ if ((numdns < DNS_MAX_SERVERS) && (dns_pcb != NULL) &&
+ (dnsserver != NULL) && (dnsserver->addr !=0 )) {
+ dns_servers[numdns] = (*dnsserver);
+ }
+}
+
+/**
+ * Obtain one of the currently configured DNS server.
+ *
+ * @param numdns the index of the DNS server
+ * @return IP address of the indexed DNS server or "ip_addr_any" if the DNS
+ * server has not been configured.
+ */
+struct ip_addr
+dns_getserver(u8_t numdns)
+{
+ if (numdns < DNS_MAX_SERVERS) {
+ return dns_servers[numdns];
+ } else {
+ return *IP_ADDR_ANY;
+ }
+}
+
+/**
+ * The DNS resolver client timer - handle retries and timeouts and should
+ * be called every DNS_TMR_INTERVAL milliseconds (every second by default).
+ */
+void
+dns_tmr(void)
+{
+ if (dns_pcb != NULL) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_tmr: dns_check_entries\n"));
+ dns_check_entries();
+ }
+}
+
+#if DNS_LOCAL_HOSTLIST
+static void
+dns_init_local()
+{
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT)
+ int i;
+ struct local_hostlist_entry *entry;
+ /* Dynamic: copy entries from DNS_LOCAL_HOSTLIST_INIT to list */
+ struct local_hostlist_entry local_hostlist_init[] = DNS_LOCAL_HOSTLIST_INIT;
+ for (i = 0; i < sizeof(local_hostlist_init) / sizeof(struct local_hostlist_entry); i++) {
+ entry = mem_malloc(sizeof(struct local_hostlist_entry));
+ LWIP_ASSERT("mem-error in dns_init_local", entry != NULL);
+ if (entry != NULL) {
+ struct local_hostlist_entry *init_entry = &local_hostlist_init[i];
+ entry->name = init_entry->name;
+ entry->addr = init_entry->addr;
+ entry->next = local_hostlist_dynamic;
+ local_hostlist_dynamic = entry;
+ }
+ }
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC && defined(DNS_LOCAL_HOSTLIST_INIT) */
+}
+
+/**
+ * Scans the local host-list for a hostname.
+ *
+ * @param hostname Hostname to look for in the local host-list
+ * @return The first IP address for the hostname in the local host-list or
+ * INADDR_NONE if not found.
+ */
+static u32_t
+dns_lookup_local(const char *hostname)
+{
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+ struct local_hostlist_entry *entry = local_hostlist_dynamic;
+ while(entry != NULL) {
+ if(strcmp(entry->name, hostname) == 0) {
+ return entry->addr;
+ }
+ entry = entry->next;
+ }
+#else /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+ int i;
+ for (i = 0; i < sizeof(local_hostlist_static) / sizeof(struct local_hostlist_entry); i++) {
+ if(strcmp(local_hostlist_static[i].name, hostname) == 0) {
+ return local_hostlist_static[i].addr;
+ }
+ }
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC */
+ return INADDR_NONE;
+}
+
+#if DNS_LOCAL_HOSTLIST_IS_DYNAMIC
+/** Remove all entries from the local host-list for a specific hostname
+ * and/or IP addess
+ *
+ * @param hostname hostname for which entries shall be removed from the local
+ * host-list
+ * @param addr address for which entries shall be removed from the local host-list
+ * @return the number of removed entries
+ */
+int
+dns_local_removehost(const char *hostname, const struct ip_addr *addr)
+{
+ int removed = 0;
+ struct local_hostlist_entry *entry = local_hostlist_dynamic;
+ struct local_hostlist_entry *last_entry = NULL;
+ while (entry != NULL) {
+ if (((hostname == NULL) || !strcmp(entry->name, hostname)) &&
+ ((addr == NULL) || (entry->addr == addr->addr))) {
+ struct local_hostlist_entry *free_entry;
+ if (last_entry != NULL) {
+ last_entry->next = entry->next;
+ } else {
+ local_hostlist_dynamic = entry->next;
+ }
+ free_entry = entry;
+ entry = entry->next;
+ mem_free(free_entry);
+ removed++;
+ } else {
+ last_entry = entry;
+ entry = entry->next;
+ }
+ }
+ return removed;
+}
+
+/**
+ * Add a hostname/IP address pair to the local host-list.
+ * Duplicates are not checked.
+ *
+ * @param hostname hostname of the new entry
+ * @param addr IP address of the new entry
+ * @return ERR_OK if succeeded or ERR_MEM on memory error
+ */
+err_t
+dns_local_addhost(const char *hostname, const struct ip_addr *addr)
+{
+ struct local_hostlist_entry *entry;
+ entry = mem_malloc(sizeof(struct local_hostlist_entry));
+ if (entry == NULL) {
+ return ERR_MEM;
+ }
+ entry->name = hostname;
+ entry->addr = addr->addr;
+ entry->next = local_hostlist_dynamic;
+ local_hostlist_dynamic = entry;
+ return ERR_OK;
+}
+#endif /* DNS_LOCAL_HOSTLIST_IS_DYNAMIC*/
+#endif /* DNS_LOCAL_HOSTLIST */
+
+/**
+ * Look up a hostname in the array of known hostnames.
+ *
+ * @note This function only looks in the internal array of known
+ * hostnames, it does not send out a query for the hostname if none
+ * was found. The function dns_enqueue() can be used to send a query
+ * for a hostname.
+ *
+ * @param name the hostname to look up
+ * @return the hostname's IP address, as u32_t (instead of struct ip_addr to
+ * better check for failure: != INADDR_NONE) or INADDR_NONE if the hostname
+ * was not found in the cached dns_table.
+ */
+static u32_t
+dns_lookup(const char *name)
+{
+ u8_t i;
+#if DNS_LOCAL_HOSTLIST || defined(DNS_LOOKUP_LOCAL_EXTERN)
+ u32_t addr;
+#endif /* DNS_LOCAL_HOSTLIST || defined(DNS_LOOKUP_LOCAL_EXTERN) */
+#if DNS_LOCAL_HOSTLIST
+ if ((addr = dns_lookup_local(name)) != INADDR_NONE) {
+ return addr;
+ }
+#endif /* DNS_LOCAL_HOSTLIST */
+#ifdef DNS_LOOKUP_LOCAL_EXTERN
+ if((addr = DNS_LOOKUP_LOCAL_EXTERN(name)) != INADDR_NONE) {
+ return addr;
+ }
+#endif /* DNS_LOOKUP_LOCAL_EXTERN */
+
+ /* Walk through name list, return entry if found. If not, return NULL. */
+ for (i = 0; i < DNS_TABLE_SIZE; ++i) {
+ if ((dns_table[i].state == DNS_STATE_DONE) &&
+ (strcmp(name, dns_table[i].name) == 0)) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_lookup: \"%s\": found = ", name));
+ ip_addr_debug_print(DNS_DEBUG, &(dns_table[i].ipaddr));
+ LWIP_DEBUGF(DNS_DEBUG, ("\n"));
+ return dns_table[i].ipaddr.addr;
+ }
+ }
+
+ return INADDR_NONE;
+}
+
+#if DNS_DOES_NAME_CHECK
+/**
+ * Compare the "dotted" name "query" with the encoded name "response"
+ * to make sure an answer from the DNS server matches the current dns_table
+ * entry (otherwise, answers might arrive late for hostname not on the list
+ * any more).
+ *
+ * @param query hostname (not encoded) from the dns_table
+ * @param response encoded hostname in the DNS response
+ * @return 0: names equal; 1: names differ
+ */
+static u8_t
+dns_compare_name(unsigned char *query, unsigned char *response)
+{
+ unsigned char n;
+
+ do {
+ n = *response++;
+ /** @see RFC 1035 - 4.1.4. Message compression */
+ if ((n & 0xc0) == 0xc0) {
+ /* Compressed name */
+ break;
+ } else {
+ /* Not compressed name */
+ while (n > 0) {
+ if ((*query) != (*response)) {
+ return 1;
+ }
+ ++response;
+ ++query;
+ --n;
+ };
+ ++query;
+ }
+ } while (*response != 0);
+
+ return 0;
+}
+#endif /* DNS_DOES_NAME_CHECK */
+
+/**
+ * Walk through a compact encoded DNS name and return the end of the name.
+ *
+ * @param query encoded DNS name in the DNS server response
+ * @return end of the name
+ */
+static unsigned char *
+dns_parse_name(unsigned char *query)
+{
+ unsigned char n;
+
+ do {
+ n = *query++;
+ /** @see RFC 1035 - 4.1.4. Message compression */
+ if ((n & 0xc0) == 0xc0) {
+ /* Compressed name */
+ break;
+ } else {
+ /* Not compressed name */
+ while (n > 0) {
+ ++query;
+ --n;
+ };
+ }
+ } while (*query != 0);
+
+ return query + 1;
+}
+
+/**
+ * Send a DNS query packet.
+ *
+ * @param numdns index of the DNS server in the dns_servers table
+ * @param name hostname to query
+ * @param id index of the hostname in dns_table, used as transaction ID in the
+ * DNS query packet
+ * @return ERR_OK if packet is sent; an err_t indicating the problem otherwise
+ */
+static err_t
+dns_send(u8_t numdns, const char* name, u8_t id)
+{
+ err_t err;
+ struct dns_hdr *hdr;
+ struct dns_query qry;
+ struct pbuf *p;
+ char *query, *nptr;
+ const char *pHostname;
+ u8_t n;
+
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_send: dns_servers[%"U16_F"] \"%s\": request\n",
+ (u16_t)(numdns), name));
+ LWIP_ASSERT("dns server out of array", numdns < DNS_MAX_SERVERS);
+ LWIP_ASSERT("dns server has no IP address set", dns_servers[numdns].addr != 0);
+
+ /* if here, we have either a new query or a retry on a previous query to process */
+ p = pbuf_alloc(PBUF_TRANSPORT, SIZEOF_DNS_HDR + DNS_MAX_NAME_LENGTH +
+ SIZEOF_DNS_QUERY, PBUF_RAM);
+ if (p != NULL) {
+ LWIP_ASSERT("pbuf must be in one piece", p->next == NULL);
+ /* fill dns header */
+ hdr = (struct dns_hdr*)p->payload;
+ memset(hdr, 0, SIZEOF_DNS_HDR);
+ hdr->id = htons(id);
+ hdr->flags1 = DNS_FLAG1_RD;
+ hdr->numquestions = htons(1);
+ query = (char*)hdr + SIZEOF_DNS_HDR;
+ pHostname = name;
+ --pHostname;
+
+ /* convert hostname into suitable query format. */
+ do {
+ ++pHostname;
+ nptr = query;
+ ++query;
+ for(n = 0; *pHostname != '.' && *pHostname != 0; ++pHostname) {
+ *query = *pHostname;
+ ++query;
+ ++n;
+ }
+ *nptr = n;
+ } while(*pHostname != 0);
+ *query++='\0';
+
+ /* fill dns query */
+ qry.type = htons(DNS_RRTYPE_A);
+ qry.class = htons(DNS_RRCLASS_IN);
+ MEMCPY( query, &qry, SIZEOF_DNS_QUERY);
+
+ /* resize pbuf to the exact dns query */
+ pbuf_realloc(p, (query + SIZEOF_DNS_QUERY) - ((char*)(p->payload)));
+
+ /* connect to the server for faster receiving */
+ udp_connect(dns_pcb, &dns_servers[numdns], DNS_SERVER_PORT);
+ /* send dns packet */
+ err = udp_sendto(dns_pcb, p, &dns_servers[numdns], DNS_SERVER_PORT);
+
+ /* free pbuf */
+ pbuf_free(p);
+ } else {
+ err = ERR_MEM;
+ }
+
+ return err;
+}
+
+/**
+ * dns_check_entry() - see if pEntry has not yet been queried and, if so, sends out a query.
+ * Check an entry in the dns_table:
+ * - send out query for new entries
+ * - retry old pending entries on timeout (also with different servers)
+ * - remove completed entries from the table if their TTL has expired
+ *
+ * @param i index of the dns_table entry to check
+ */
+static void
+dns_check_entry(u8_t i)
+{
+ struct dns_table_entry *pEntry = &dns_table[i];
+
+ LWIP_ASSERT("array index out of bounds", i < DNS_TABLE_SIZE);
+
+ switch(pEntry->state) {
+
+ case DNS_STATE_NEW: {
+ /* initialize new entry */
+ pEntry->state = DNS_STATE_ASKING;
+ pEntry->numdns = 0;
+ pEntry->tmr = 1;
+ pEntry->retries = 0;
+
+ /* send DNS packet for this entry */
+ dns_send(pEntry->numdns, pEntry->name, i);
+ break;
+ }
+
+ case DNS_STATE_ASKING: {
+ if (--pEntry->tmr == 0) {
+ if (++pEntry->retries == DNS_MAX_RETRIES) {
+ if ((pEntry->numdns+1<DNS_MAX_SERVERS) && (dns_servers[pEntry->numdns+1].addr!=0)) {
+ /* change of server */
+ pEntry->numdns++;
+ pEntry->tmr = 1;
+ pEntry->retries = 0;
+ break;
+ } else {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": timeout\n", pEntry->name));
+ /* call specified callback function if provided */
+ if (pEntry->found)
+ (*pEntry->found)(pEntry->name, NULL, pEntry->arg);
+ /* flush this entry */
+ pEntry->state = DNS_STATE_UNUSED;
+ pEntry->found = NULL;
+ break;
+ }
+ }
+
+ /* wait longer for the next retry */
+ pEntry->tmr = pEntry->retries;
+
+ /* send DNS packet for this entry */
+ dns_send(pEntry->numdns, pEntry->name, i);
+ }
+ break;
+ }
+
+ case DNS_STATE_DONE: {
+ /* if the time to live is nul */
+ if (--pEntry->ttl == 0) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_check_entry: \"%s\": flush\n", pEntry->name));
+ /* flush this entry */
+ pEntry->state = DNS_STATE_UNUSED;
+ pEntry->found = NULL;
+ }
+ break;
+ }
+ case DNS_STATE_UNUSED:
+ /* nothing to do */
+ break;
+ default:
+ LWIP_ASSERT("unknown dns_table entry state:", 0);
+ break;
+ }
+}
+
+/**
+ * Call dns_check_entry for each entry in dns_table - check all entries.
+ */
+static void
+dns_check_entries(void)
+{
+ u8_t i;
+
+ for (i = 0; i < DNS_TABLE_SIZE; ++i) {
+ dns_check_entry(i);
+ }
+}
+
+/**
+ * Receive input function for DNS response packets arriving for the dns UDP pcb.
+ *
+ * @params see udp.h
+ */
+static void
+dns_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
+{
+ u8_t i;
+ char *pHostname;
+ struct dns_hdr *hdr;
+ struct dns_answer ans;
+ struct dns_table_entry *pEntry;
+ u8_t nquestions, nanswers;
+#if (DNS_USES_STATIC_BUF == 0)
+ u8_t dns_payload[DNS_MSG_SIZE];
+#endif /* (DNS_USES_STATIC_BUF == 0) */
+#if (DNS_USES_STATIC_BUF == 2)
+ u8_t* dns_payload;
+#endif /* (DNS_USES_STATIC_BUF == 2) */
+
+ LWIP_UNUSED_ARG(arg);
+ LWIP_UNUSED_ARG(pcb);
+ LWIP_UNUSED_ARG(addr);
+ LWIP_UNUSED_ARG(port);
+
+ /* is the dns message too big ? */
+ if (p->tot_len > DNS_MSG_SIZE) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too big\n"));
+ /* free pbuf and return */
+ goto memerr1;
+ }
+
+ /* is the dns message big enough ? */
+ if (p->tot_len < (SIZEOF_DNS_HDR + SIZEOF_DNS_QUERY + SIZEOF_DNS_ANSWER)) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: pbuf too small\n"));
+ /* free pbuf and return */
+ goto memerr1;
+ }
+
+#if (DNS_USES_STATIC_BUF == 2)
+ dns_payload = mem_malloc(p->tot_len);
+ if (dns_payload == NULL) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: mem_malloc error\n"));
+ /* free pbuf and return */
+ goto memerr1;
+ }
+#endif /* (DNS_USES_STATIC_BUF == 2) */
+
+ /* copy dns payload inside static buffer for processing */
+ if (pbuf_copy_partial(p, dns_payload, p->tot_len, 0) == p->tot_len) {
+ /* The ID in the DNS header should be our entry into the name table. */
+ hdr = (struct dns_hdr*)dns_payload;
+ i = htons(hdr->id);
+ if (i < DNS_TABLE_SIZE) {
+ pEntry = &dns_table[i];
+ if(pEntry->state == DNS_STATE_ASKING) {
+ /* This entry is now completed. */
+ pEntry->state = DNS_STATE_DONE;
+ pEntry->err = hdr->flags2 & DNS_FLAG2_ERR_MASK;
+
+ /* We only care about the question(s) and the answers. The authrr
+ and the extrarr are simply discarded. */
+ nquestions = htons(hdr->numquestions);
+ nanswers = htons(hdr->numanswers);
+
+ /* Check for error. If so, call callback to inform. */
+ if (((hdr->flags1 & DNS_FLAG1_RESPONSE) == 0) || (pEntry->err != 0) || (nquestions != 1)) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in flags\n", pEntry->name));
+ /* call callback to indicate error, clean up memory and return */
+ goto responseerr;
+ }
+
+#if DNS_DOES_NAME_CHECK
+ /* Check if the name in the "question" part match with the name in the entry. */
+ if (dns_compare_name((unsigned char *)(pEntry->name), (unsigned char *)dns_payload + SIZEOF_DNS_HDR) != 0) {
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response not match to query\n", pEntry->name));
+ /* call callback to indicate error, clean up memory and return */
+ goto responseerr;
+ }
+#endif /* DNS_DOES_NAME_CHECK */
+
+ /* Skip the name in the "question" part */
+ pHostname = (char *) dns_parse_name((unsigned char *)dns_payload + SIZEOF_DNS_HDR) + SIZEOF_DNS_QUERY;
+
+ while(nanswers > 0) {
+ /* skip answer resource record's host name */
+ pHostname = (char *) dns_parse_name((unsigned char *)pHostname);
+
+ /* Check for IP address type and Internet class. Others are discarded. */
+ MEMCPY(&ans, pHostname, SIZEOF_DNS_ANSWER);
+ if((ntohs(ans.type) == DNS_RRTYPE_A) && (ntohs(ans.class) == DNS_RRCLASS_IN) && (ntohs(ans.len) == sizeof(struct ip_addr)) ) {
+ /* read the answer resource record's TTL, and maximize it if needed */
+ pEntry->ttl = ntohl(ans.ttl);
+ if (pEntry->ttl > DNS_MAX_TTL) {
+ pEntry->ttl = DNS_MAX_TTL;
+ }
+ /* read the IP address after answer resource record's header */
+ MEMCPY( &(pEntry->ipaddr), (pHostname+SIZEOF_DNS_ANSWER), sizeof(struct ip_addr));
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": response = ", pEntry->name));
+ ip_addr_debug_print(DNS_DEBUG, (&(pEntry->ipaddr)));
+ LWIP_DEBUGF(DNS_DEBUG, ("\n"));
+ /* call specified callback function if provided */
+ if (pEntry->found) {
+ (*pEntry->found)(pEntry->name, &pEntry->ipaddr, pEntry->arg);
+ }
+ /* deallocate memory and return */
+ goto memerr2;
+ } else {
+ pHostname = pHostname + SIZEOF_DNS_ANSWER + htons(ans.len);
+ }
+ --nanswers;
+ }
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_recv: \"%s\": error in response\n", pEntry->name));
+ /* call callback to indicate error, clean up memory and return */
+ goto responseerr;
+ }
+ }
+ }
+
+ /* deallocate memory and return */
+ goto memerr2;
+
+responseerr:
+ /* ERROR: call specified callback function with NULL as name to indicate an error */
+ if (pEntry->found) {
+ (*pEntry->found)(pEntry->name, NULL, pEntry->arg);
+ }
+ /* flush this entry */
+ pEntry->state = DNS_STATE_UNUSED;
+ pEntry->found = NULL;
+
+memerr2:
+#if (DNS_USES_STATIC_BUF == 2)
+ /* free dns buffer */
+ mem_free(dns_payload);
+#endif /* (DNS_USES_STATIC_BUF == 2) */
+
+memerr1:
+ /* free pbuf */
+ pbuf_free(p);
+ return;
+}
+
+/**
+ * Queues a new hostname to resolve and sends out a DNS query for that hostname
+ *
+ * @param name the hostname that is to be queried
+ * @param found a callback founction to be called on success, failure or timeout
+ * @param callback_arg argument to pass to the callback function
+ * @return @return a err_t return code.
+ */
+static err_t
+dns_enqueue(const char *name, dns_found_callback found, void *callback_arg)
+{
+ u8_t i;
+ u8_t lseq, lseqi;
+ struct dns_table_entry *pEntry = NULL;
+
+ /* search an unused entry, or the oldest one */
+ lseq = lseqi = 0;
+ for (i = 0; i < DNS_TABLE_SIZE; ++i) {
+ pEntry = &dns_table[i];
+ /* is it an unused entry ? */
+ if (pEntry->state == DNS_STATE_UNUSED)
+ break;
+
+ /* check if this is the oldest completed entry */
+ if (pEntry->state == DNS_STATE_DONE) {
+ if ((dns_seqno - pEntry->seqno) > lseq) {
+ lseq = dns_seqno - pEntry->seqno;
+ lseqi = i;
+ }
+ }
+ }
+
+ /* if we don't have found an unused entry, use the oldest completed one */
+ if (i == DNS_TABLE_SIZE) {
+ if ((lseqi >= DNS_TABLE_SIZE) || (dns_table[lseqi].state != DNS_STATE_DONE)) {
+ /* no entry can't be used now, table is full */
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": DNS entries table is full\n", name));
+ return ERR_MEM;
+ } else {
+ /* use the oldest completed one */
+ i = lseqi;
+ pEntry = &dns_table[i];
+ }
+ }
+
+ /* use this entry */
+ LWIP_DEBUGF(DNS_DEBUG, ("dns_enqueue: \"%s\": use DNS entry %"U16_F"\n", name, (u16_t)(i)));
+
+ /* fill the entry */
+ pEntry->state = DNS_STATE_NEW;
+ pEntry->seqno = dns_seqno++;
+ pEntry->found = found;
+ pEntry->arg = callback_arg;
+ strcpy(pEntry->name, name);
+
+ /* force to send query without waiting timer */
+ dns_check_entry(i);
+
+ /* dns query is enqueued */
+ return ERR_INPROGRESS;
+}
+
+/**
+ * Resolve a hostname (string) into an IP address.
+ * NON-BLOCKING callback version for use with raw API!!!
+ *
+ * Returns immediately with one of err_t return codes:
+ * - ERR_OK if hostname is a valid IP address string or the host
+ * name is already in the local names table.
+ * - ERR_INPROGRESS enqueue a request to be sent to the DNS server
+ * for resolution if no errors are present.
+ *
+ * @param hostname the hostname that is to be queried
+ * @param addr pointer to a struct ip_addr where to store the address if it is already
+ * cached in the dns_table (only valid if ERR_OK is returned!)
+ * @param found a callback function to be called on success, failure or timeout (only if
+ * ERR_INPROGRESS is returned!)
+ * @param callback_arg argument to pass to the callback function
+ * @return a err_t return code.
+ */
+err_t
+dns_gethostbyname(const char *hostname, struct ip_addr *addr, dns_found_callback found,
+ void *callback_arg)
+{
+ /* not initialized or no valid server yet, or invalid addr pointer
+ * or invalid hostname or invalid hostname length */
+ if ((dns_pcb == NULL) || (addr == NULL) ||
+ (!hostname) || (!hostname[0]) ||
+ (strlen(hostname) >= DNS_MAX_NAME_LENGTH)) {
+ return ERR_VAL;
+ }
+
+#if LWIP_HAVE_LOOPIF
+ if (strcmp(hostname,"localhost")==0) {
+ addr->addr = INADDR_LOOPBACK;
+ return ERR_OK;
+ }
+#endif /* LWIP_HAVE_LOOPIF */
+
+ /* host name already in octet notation? set ip addr and return ERR_OK
+ * already have this address cached? */
+ if (((addr->addr = inet_addr(hostname)) != INADDR_NONE) ||
+ ((addr->addr = dns_lookup(hostname)) != INADDR_NONE)) {
+ return ERR_OK;
+ }
+
+ /* queue query with specified callback */
+ return dns_enqueue(hostname, found, callback_arg);
+}
+
+#endif /* LWIP_DNS */
diff --git a/core/lwip/src/core/init.c b/core/lwip/src/core/init.c
new file mode 100644
index 00000000..277811a6
--- /dev/null
+++ b/core/lwip/src/core/init.c
@@ -0,0 +1,269 @@
+/**
+ * @file
+ * Modules initialization
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/init.h"
+#include "lwip/stats.h"
+#include "lwip/sys.h"
+#include "lwip/mem.h"
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/sockets.h"
+#include "lwip/ip.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/snmp_msg.h"
+#include "lwip/autoip.h"
+#include "lwip/igmp.h"
+#include "lwip/dns.h"
+#include "netif/etharp.h"
+
+/* Compile-time sanity checks for configuration errors.
+ * These can be done independently of LWIP_DEBUG, without penalty.
+ */
+#ifndef BYTE_ORDER
+ #error "BYTE_ORDER is not defined, you have to define it in your cc.h"
+#endif
+#if (!IP_SOF_BROADCAST && IP_SOF_BROADCAST_RECV)
+ #error "If you want to use broadcast filter per pcb on recv operations, you have to define IP_SOF_BROADCAST=1 in your lwipopts.h"
+#endif
+#if (!LWIP_ARP && ARP_QUEUEING)
+ #error "If you want to use ARP Queueing, you have to define LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_UDPLITE)
+ #error "If you want to use UDP Lite, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_SNMP)
+ #error "If you want to use SNMP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_DHCP)
+ #error "If you want to use DHCP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_IGMP)
+ #error "If you want to use IGMP, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_UDP && LWIP_DNS)
+ #error "If you want to use DNS, you have to define LWIP_UDP=1 in your lwipopts.h"
+#endif
+#if (LWIP_ARP && (ARP_TABLE_SIZE > 0x7f))
+ #error "If you want to use ARP, ARP_TABLE_SIZE must fit in an s8_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_ARP && ARP_QUEUEING && (MEMP_NUM_ARP_QUEUE<=0))
+ #error "If you want to use ARP Queueing, you have to define MEMP_NUM_ARP_QUEUE>=1 in your lwipopts.h"
+#endif
+#if (LWIP_RAW && (MEMP_NUM_RAW_PCB<=0))
+ #error "If you want to use RAW, you have to define MEMP_NUM_RAW_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_UDP && (MEMP_NUM_UDP_PCB<=0))
+ #error "If you want to use UDP, you have to define MEMP_NUM_UDP_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (MEMP_NUM_TCP_PCB<=0))
+ #error "If you want to use TCP, you have to define MEMP_NUM_TCP_PCB>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_WND > 0xffff))
+ #error "If you want to use TCP, TCP_WND must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_TCP && (TCP_SND_QUEUELEN > 0xffff))
+ #error "If you want to use TCP, TCP_SND_QUEUELEN must fit in an u16_t, so, you have to reduce it in your lwipopts.h"
+#endif
+#if (LWIP_TCP && ((TCP_MAXRTX > 12) || (TCP_SYNMAXRTX > 12)))
+ #error "If you want to use TCP, TCP_MAXRTX and TCP_SYNMAXRTX must less or equal to 12 (due to tcp_backoff table), so, you have to reduce them in your lwipopts.h"
+#endif
+#if (LWIP_TCP && TCP_LISTEN_BACKLOG && (TCP_DEFAULT_LISTEN_BACKLOG < 0) || (TCP_DEFAULT_LISTEN_BACKLOG > 0xff))
+ #error "If you want to use TCP backlog, TCP_DEFAULT_LISTEN_BACKLOG must fit into an u8_t"
+#endif
+#if (LWIP_IGMP && (MEMP_NUM_IGMP_GROUP<=1))
+ #error "If you want to use IGMP, you have to define MEMP_NUM_IGMP_GROUP>1 in your lwipopts.h"
+#endif
+#if (PPP_SUPPORT && (NO_SYS==1))
+ #error "If you want to use PPP, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if (LWIP_NETIF_API && (NO_SYS==1))
+ #error "If you want to use NETIF API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if ((LWIP_SOCKET || LWIP_NETCONN) && (NO_SYS==1))
+ #error "If you want to use Sequential API, you have to define NO_SYS=0 in your lwipopts.h"
+#endif
+#if ((LWIP_NETCONN || LWIP_SOCKET) && (MEMP_NUM_TCPIP_MSG_API<=0))
+ #error "If you want to use Sequential API, you have to define MEMP_NUM_TCPIP_MSG_API>=1 in your lwipopts.h"
+#endif
+#if (!LWIP_NETCONN && LWIP_SOCKET)
+ #error "If you want to use Socket API, you have to define LWIP_NETCONN=1 in your lwipopts.h"
+#endif
+#if (((!LWIP_DHCP) || (!LWIP_AUTOIP)) && LWIP_DHCP_AUTOIP_COOP)
+ #error "If you want to use DHCP/AUTOIP cooperation mode, you have to define LWIP_DHCP=1 and LWIP_AUTOIP=1 in your lwipopts.h"
+#endif
+#if (((!LWIP_DHCP) || (!LWIP_ARP)) && DHCP_DOES_ARP_CHECK)
+ #error "If you want to use DHCP ARP checking, you have to define LWIP_DHCP=1 and LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (!LWIP_ARP && LWIP_AUTOIP)
+ #error "If you want to use AUTOIP, you have to define LWIP_ARP=1 in your lwipopts.h"
+#endif
+#if (LWIP_SNMP && (SNMP_CONCURRENT_REQUESTS<=0))
+ #error "If you want to use SNMP, you have to define SNMP_CONCURRENT_REQUESTS>=1 in your lwipopts.h"
+#endif
+#if (LWIP_SNMP && (SNMP_TRAP_DESTINATIONS<=0))
+ #error "If you want to use SNMP, you have to define SNMP_TRAP_DESTINATIONS>=1 in your lwipopts.h"
+#endif
+#if (LWIP_TCP && ((LWIP_EVENT_API && LWIP_CALLBACK_API) || (!LWIP_EVENT_API && !LWIP_CALLBACK_API)))
+ #error "One and exactly one of LWIP_EVENT_API and LWIP_CALLBACK_API has to be enabled in your lwipopts.h"
+#endif
+/* There must be sufficient timeouts, taking into account requirements of the subsystems. */
+#if ((NO_SYS==0) && (MEMP_NUM_SYS_TIMEOUT < (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + LWIP_DNS + PPP_SUPPORT)))
+ #error "MEMP_NUM_SYS_TIMEOUT is too low to accomodate all required timeouts"
+#endif
+#if (IP_REASSEMBLY && (MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS))
+ #error "MEMP_NUM_REASSDATA > IP_REASS_MAX_PBUFS doesn't make sense since each struct ip_reassdata must hold 2 pbufs at least!"
+#endif
+#if (MEM_LIBC_MALLOC && MEM_USE_POOLS)
+ #error "MEM_LIBC_MALLOC and MEM_USE_POOLS may not both be simultaneously enabled in your lwipopts.h"
+#endif
+#if (MEM_USE_POOLS && !MEMP_USE_CUSTOM_POOLS)
+ #error "MEM_USE_POOLS requires custom pools (MEMP_USE_CUSTOM_POOLS) to be enabled in your lwipopts.h"
+#endif
+#if (PBUF_POOL_BUFSIZE <= MEM_ALIGNMENT)
+ #error "PBUF_POOL_BUFSIZE must be greater than MEM_ALIGNMENT or the offset may take the full first pbuf"
+#endif
+#if (TCP_QUEUE_OOSEQ && !LWIP_TCP)
+ #error "TCP_QUEUE_OOSEQ requires LWIP_TCP"
+#endif
+#if (DNS_LOCAL_HOSTLIST && !DNS_LOCAL_HOSTLIST_IS_DYNAMIC && !(defined(DNS_LOCAL_HOSTLIST_INIT)))
+ #error "you have to define define DNS_LOCAL_HOSTLIST_INIT {{'host1', 0x123}, {'host2', 0x234}} to initialize DNS_LOCAL_HOSTLIST"
+#endif
+
+
+/* Compile-time checks for deprecated options.
+ */
+#ifdef MEMP_NUM_TCPIP_MSG
+ #error "MEMP_NUM_TCPIP_MSG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef MEMP_NUM_API_MSG
+ #error "MEMP_NUM_API_MSG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef TCP_REXMIT_DEBUG
+ #error "TCP_REXMIT_DEBUG option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef RAW_STATS
+ #error "RAW_STATS option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef ETHARP_QUEUE_FIRST
+ #error "ETHARP_QUEUE_FIRST option is deprecated. Remove it from your lwipopts.h."
+#endif
+#ifdef ETHARP_ALWAYS_INSERT
+ #error "ETHARP_ALWAYS_INSERT option is deprecated. Remove it from your lwipopts.h."
+#endif
+#if SO_REUSE
+/* I removed the lot since this was an ugly hack. It broke the raw-API.
+ It also came with many ugly goto's, Christiaan Simons. */
+ #error "SO_REUSE currently unavailable, this was a hack"
+#endif
+
+#ifdef LWIP_DEBUG
+static void
+lwip_sanity_check(void)
+{
+ /* Warnings */
+#if LWIP_NETCONN
+ if (MEMP_NUM_NETCONN > (MEMP_NUM_TCP_PCB+MEMP_NUM_TCP_PCB_LISTEN+MEMP_NUM_UDP_PCB+MEMP_NUM_RAW_PCB))
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: MEMP_NUM_NETCONN should be less than the sum of MEMP_NUM_{TCP,RAW,UDP}_PCB+MEMP_NUM_TCP_PCB_LISTEN\n"));
+#endif /* LWIP_NETCONN */
+#if LWIP_TCP
+ if (MEMP_NUM_TCP_SEG < TCP_SND_QUEUELEN)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: MEMP_NUM_TCP_SEG should be at least as big as TCP_SND_QUEUELEN\n"));
+ if (TCP_SND_QUEUELEN < (2 * (TCP_SND_BUF/TCP_MSS)))
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_SND_QUEUELEN must be at least as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work\n"));
+ if (TCP_SNDLOWAT > TCP_SND_BUF)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_SNDLOWAT must be less than or equal to TCP_SND_BUF.\n"));
+ if (TCP_WND > (PBUF_POOL_SIZE*PBUF_POOL_BUFSIZE))
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_WND is larger than space provided by PBUF_POOL_SIZE*PBUF_POOL_BUFSIZE\n"));
+ if (TCP_WND < TCP_MSS)
+ LWIP_PLATFORM_DIAG(("lwip_sanity_check: WARNING: TCP_WND is smaller than MSS\n"));
+#endif /* LWIP_TCP */
+}
+#else /* LWIP_DEBUG */
+#define lwip_sanity_check()
+#endif /* LWIP_DEBUG */
+
+/**
+ * Perform Sanity check of user-configurable values, and initialize all modules.
+ */
+void
+lwip_init(void)
+{
+ /* Sanity check user-configurable values */
+ lwip_sanity_check();
+
+ /* Modules initialization */
+ stats_init();
+ sys_init();
+ mem_init();
+ memp_init();
+ pbuf_init();
+ netif_init();
+#if LWIP_SOCKET
+ lwip_socket_init();
+#endif /* LWIP_SOCKET */
+ ip_init();
+#if LWIP_ARP
+ etharp_init();
+#endif /* LWIP_ARP */
+#if LWIP_RAW
+ raw_init();
+#endif /* LWIP_RAW */
+#if LWIP_UDP
+ udp_init();
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ tcp_init();
+#endif /* LWIP_TCP */
+#if LWIP_SNMP
+ snmp_init();
+#endif /* LWIP_SNMP */
+#if LWIP_AUTOIP
+ autoip_init();
+#endif /* LWIP_AUTOIP */
+#if LWIP_IGMP
+ igmp_init();
+#endif /* LWIP_IGMP */
+#if LWIP_DNS
+ dns_init();
+#endif /* LWIP_DNS */
+}
diff --git a/core/lwip/src/core/ipv4/autoip.c b/core/lwip/src/core/ipv4/autoip.c
new file mode 100644
index 00000000..367adb06
--- /dev/null
+++ b/core/lwip/src/core/ipv4/autoip.c
@@ -0,0 +1,453 @@
+/**
+ * @file
+ * AutoIP Automatic LinkLocal IP Configuration
+ *
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * Author: Dominik Spies <kontakt@dspies.de>
+ *
+ * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 3927.
+ *
+ *
+ * Please coordinate changes and requests with Dominik Spies
+ * <kontakt@dspies.de>
+ */
+
+/*******************************************************************************
+ * USAGE:
+ *
+ * define LWIP_AUTOIP 1 in your lwipopts.h
+ *
+ * If you don't use tcpip.c (so, don't call, you don't call tcpip_init):
+ * - First, call autoip_init().
+ * - call autoip_tmr() all AUTOIP_TMR_INTERVAL msces,
+ * that should be defined in autoip.h.
+ * I recommend a value of 100. The value must divide 1000 with a remainder almost 0.
+ * Possible values are 1000, 500, 333, 250, 200, 166, 142, 125, 111, 100 ....
+ *
+ * Without DHCP:
+ * - Call autoip_start() after netif_add().
+ *
+ * With DHCP:
+ * - define LWIP_DHCP_AUTOIP_COOP 1 in your lwipopts.h.
+ * - Configure your DHCP Client.
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/mem.h"
+#include "lwip/udp.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/autoip.h"
+#include "netif/etharp.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+/* 169.254.0.0 */
+#define AUTOIP_NET 0xA9FE0000
+/* 169.254.1.0 */
+#define AUTOIP_RANGE_START (AUTOIP_NET | 0x0100)
+/* 169.254.254.255 */
+#define AUTOIP_RANGE_END (AUTOIP_NET | 0xFEFF)
+
+
+/** Pseudo random macro based on netif informations.
+ * You could use "rand()" from the C Library if you define LWIP_AUTOIP_RAND in lwipopts.h */
+#ifndef LWIP_AUTOIP_RAND
+#define LWIP_AUTOIP_RAND(netif) ( (((u32_t)((netif->hwaddr[5]) & 0xff) << 24) | \
+ ((u32_t)((netif->hwaddr[3]) & 0xff) << 16) | \
+ ((u32_t)((netif->hwaddr[2]) & 0xff) << 8) | \
+ ((u32_t)((netif->hwaddr[4]) & 0xff))) + \
+ (netif->autoip?netif->autoip->tried_llipaddr:0))
+#endif /* LWIP_AUTOIP_RAND */
+
+/**
+ * Macro that generates the initial IP address to be tried by AUTOIP.
+ * If you want to override this, define it to something else in lwipopts.h.
+ */
+#ifndef LWIP_AUTOIP_CREATE_SEED_ADDR
+#define LWIP_AUTOIP_CREATE_SEED_ADDR(netif) \
+ (AUTOIP_RANGE_START + ((u32_t)(((u8_t)(netif->hwaddr[4])) | \
+ ((u32_t)((u8_t)(netif->hwaddr[5]))) << 8)))
+#endif /* LWIP_AUTOIP_CREATE_SEED_ADDR */
+
+/* static functions */
+static void autoip_handle_arp_conflict(struct netif *netif);
+
+/* creates a pseudo random LL IP-Address for a network interface */
+static void autoip_create_addr(struct netif *netif, struct ip_addr *IPAddr);
+
+/* sends an ARP announce */
+static err_t autoip_arp_announce(struct netif *netif);
+
+/* configure interface for use with current LL IP-Address */
+static err_t autoip_bind(struct netif *netif);
+
+/**
+ * Initialize this module
+ */
+void
+autoip_init(void)
+{
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_init()\n"));
+}
+
+/**
+ * Handle a IP address conflict after an ARP conflict detection
+ */
+static void
+autoip_handle_arp_conflict(struct netif *netif)
+{
+ /* Somehow detect if we are defending or retreating */
+ unsigned char defend = 1; /* tbd */
+
+ if(defend) {
+ if(netif->autoip->lastconflict > 0) {
+ /* retreat, there was a conflicting ARP in the last
+ * DEFEND_INTERVAL seconds
+ */
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
+ ("autoip_handle_arp_conflict(): we are defending, but in DEFEND_INTERVAL, retreating\n"));
+
+ /* TODO: close all TCP sessions */
+ autoip_start(netif);
+ } else {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
+ ("autoip_handle_arp_conflict(): we are defend, send ARP Announce\n"));
+ autoip_arp_announce(netif);
+ netif->autoip->lastconflict = DEFEND_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+ }
+ } else {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
+ ("autoip_handle_arp_conflict(): we do not defend, retreating\n"));
+ /* TODO: close all TCP sessions */
+ autoip_start(netif);
+ }
+}
+
+/**
+ * Create an IP-Address out of range 169.254.1.0 to 169.254.254.255
+ *
+ * @param netif network interface on which create the IP-Address
+ * @param IPAddr ip address to initialize
+ */
+static void
+autoip_create_addr(struct netif *netif, struct ip_addr *IPAddr)
+{
+ /* Here we create an IP-Address out of range 169.254.1.0 to 169.254.254.255
+ * compliant to RFC 3927 Section 2.1
+ * We have 254 * 256 possibilities */
+
+ u32_t addr = ntohl(LWIP_AUTOIP_CREATE_SEED_ADDR(netif));
+ addr += netif->autoip->tried_llipaddr;
+ addr = AUTOIP_NET | (addr & 0xffff);
+ /* Now, 169.254.0.0 <= addr <= 169.254.255.255 */
+
+ if (addr < AUTOIP_RANGE_START) {
+ addr += AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
+ }
+ if (addr > AUTOIP_RANGE_END) {
+ addr -= AUTOIP_RANGE_END - AUTOIP_RANGE_START + 1;
+ }
+ LWIP_ASSERT("AUTOIP address not in range", (addr >= AUTOIP_RANGE_START) &&
+ (addr <= AUTOIP_RANGE_END));
+ IPAddr->addr = htonl(addr);
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
+ ("autoip_create_addr(): tried_llipaddr=%"U16_F", 0x%08"X32_F"\n",
+ (u16_t)(netif->autoip->tried_llipaddr), (u32_t)(IPAddr->addr)));
+}
+
+/**
+ * Sends an ARP announce from a network interface
+ *
+ * @param netif network interface used to send the announce
+ */
+static err_t
+autoip_arp_announce(struct netif *netif)
+{
+ return etharp_raw(netif, (struct eth_addr *)netif->hwaddr, &ethbroadcast,
+ (struct eth_addr *)netif->hwaddr, &netif->autoip->llipaddr, &ethzero,
+ &netif->autoip->llipaddr, ARP_REQUEST);
+}
+
+/**
+ * Configure interface for use with current LL IP-Address
+ *
+ * @param netif network interface to configure with current LL IP-Address
+ */
+static err_t
+autoip_bind(struct netif *netif)
+{
+ struct autoip *autoip = netif->autoip;
+ struct ip_addr sn_mask, gw_addr;
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
+ ("autoip_bind(netif=%p) %c%c%"U16_F" 0x%08"X32_F"\n",
+ (void*)netif, netif->name[0], netif->name[1], (u16_t)netif->num, autoip->llipaddr.addr));
+
+ IP4_ADDR(&sn_mask, 255, 255, 0, 0);
+ IP4_ADDR(&gw_addr, 0, 0, 0, 0);
+
+ netif_set_ipaddr(netif, &autoip->llipaddr);
+ netif_set_netmask(netif, &sn_mask);
+ netif_set_gw(netif, &gw_addr);
+
+ /* bring the interface up */
+ netif_set_up(netif);
+
+ return ERR_OK;
+}
+
+/**
+ * Start AutoIP client
+ *
+ * @param netif network interface on which start the AutoIP client
+ */
+err_t
+autoip_start(struct netif *netif)
+{
+ struct autoip *autoip = netif->autoip;
+ err_t result = ERR_OK;
+
+ if(netif_is_up(netif)) {
+ netif_set_down(netif);
+ }
+
+ /* Set IP-Address, Netmask and Gateway to 0 to make sure that
+ * ARP Packets are formed correctly
+ */
+ netif->ip_addr.addr = 0;
+ netif->netmask.addr = 0;
+ netif->gw.addr = 0;
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE,
+ ("autoip_start(netif=%p) %c%c%"U16_F"\n", (void*)netif, netif->name[0],
+ netif->name[1], (u16_t)netif->num));
+ if(autoip == NULL) {
+ /* no AutoIP client attached yet? */
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_start(): starting new AUTOIP client\n"));
+ autoip = mem_malloc(sizeof(struct autoip));
+ if(autoip == NULL) {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_start(): could not allocate autoip\n"));
+ return ERR_MEM;
+ }
+ memset( autoip, 0, sizeof(struct autoip));
+ /* store this AutoIP client in the netif */
+ netif->autoip = autoip;
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE, ("autoip_start(): allocated autoip"));
+ } else {
+ autoip->state = AUTOIP_STATE_OFF;
+ autoip->ttw = 0;
+ autoip->sent_num = 0;
+ memset(&autoip->llipaddr, 0, sizeof(struct ip_addr));
+ autoip->lastconflict = 0;
+ }
+
+ autoip_create_addr(netif, &(autoip->llipaddr));
+ autoip->tried_llipaddr++;
+ autoip->state = AUTOIP_STATE_PROBING;
+ autoip->sent_num = 0;
+
+ /* time to wait to first probe, this is randomly
+ * choosen out of 0 to PROBE_WAIT seconds.
+ * compliant to RFC 3927 Section 2.2.1
+ */
+ autoip->ttw = (u16_t)(LWIP_AUTOIP_RAND(netif) % (PROBE_WAIT * AUTOIP_TICKS_PER_SECOND));
+
+ /*
+ * if we tried more then MAX_CONFLICTS we must limit our rate for
+ * accquiring and probing address
+ * compliant to RFC 3927 Section 2.2.1
+ */
+
+ if(autoip->tried_llipaddr > MAX_CONFLICTS) {
+ autoip->ttw = RATE_LIMIT_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+ }
+
+ return result;
+}
+
+/**
+ * Stop AutoIP client
+ *
+ * @param netif network interface on which stop the AutoIP client
+ */
+err_t
+autoip_stop(struct netif *netif)
+{
+ netif->autoip->state = AUTOIP_STATE_OFF;
+ netif_set_down(netif);
+ return ERR_OK;
+}
+
+/**
+ * Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds
+ */
+void
+autoip_tmr()
+{
+ struct netif *netif = netif_list;
+ /* loop through netif's */
+ while (netif != NULL) {
+ /* only act on AutoIP configured interfaces */
+ if (netif->autoip != NULL) {
+ if(netif->autoip->lastconflict > 0) {
+ netif->autoip->lastconflict--;
+ }
+
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE,
+ ("autoip_tmr() AutoIP-State: %"U16_F", ttw=%"U16_F"\n",
+ (u16_t)(netif->autoip->state), netif->autoip->ttw));
+
+ switch(netif->autoip->state) {
+ case AUTOIP_STATE_PROBING:
+ if(netif->autoip->ttw > 0) {
+ netif->autoip->ttw--;
+ } else {
+ if(netif->autoip->sent_num == PROBE_NUM) {
+ netif->autoip->state = AUTOIP_STATE_ANNOUNCING;
+ netif->autoip->sent_num = 0;
+ netif->autoip->ttw = ANNOUNCE_WAIT * AUTOIP_TICKS_PER_SECOND;
+ } else {
+ etharp_request(netif, &(netif->autoip->llipaddr));
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
+ ("autoip_tmr() PROBING Sent Probe\n"));
+ netif->autoip->sent_num++;
+ /* calculate time to wait to next probe */
+ netif->autoip->ttw = (u16_t)((LWIP_AUTOIP_RAND(netif) %
+ ((PROBE_MAX - PROBE_MIN) * AUTOIP_TICKS_PER_SECOND) ) +
+ PROBE_MIN * AUTOIP_TICKS_PER_SECOND);
+ }
+ }
+ break;
+
+ case AUTOIP_STATE_ANNOUNCING:
+ if(netif->autoip->ttw > 0) {
+ netif->autoip->ttw--;
+ } else {
+ if(netif->autoip->sent_num == 0) {
+ /* We are here the first time, so we waited ANNOUNCE_WAIT seconds
+ * Now we can bind to an IP address and use it
+ */
+ autoip_bind(netif);
+ }
+
+ if(netif->autoip->sent_num == ANNOUNCE_NUM) {
+ netif->autoip->state = AUTOIP_STATE_BOUND;
+ netif->autoip->sent_num = 0;
+ netif->autoip->ttw = 0;
+ } else {
+ autoip_arp_announce(netif);
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3,
+ ("autoip_tmr() ANNOUNCING Sent Announce\n"));
+ netif->autoip->sent_num++;
+ netif->autoip->ttw = ANNOUNCE_INTERVAL * AUTOIP_TICKS_PER_SECOND;
+ }
+ }
+ break;
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+}
+
+/**
+ * Handles every incoming ARP Packet, called by etharp_arp_input.
+ *
+ * @param netif network interface to use for autoip processing
+ * @param hdr Incoming ARP packet
+ */
+void
+autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr)
+{
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | 3, ("autoip_arp_reply()\n"));
+ if ((netif->autoip != NULL) && (netif->autoip->state != AUTOIP_STATE_OFF)) {
+ /* when ip.src == llipaddr && hw.src != netif->hwaddr
+ *
+ * when probing ip.dst == llipaddr && hw.src != netif->hwaddr
+ * we have a conflict and must solve it
+ */
+ struct ip_addr sipaddr, dipaddr;
+ struct eth_addr netifaddr;
+ netifaddr.addr[0] = netif->hwaddr[0];
+ netifaddr.addr[1] = netif->hwaddr[1];
+ netifaddr.addr[2] = netif->hwaddr[2];
+ netifaddr.addr[3] = netif->hwaddr[3];
+ netifaddr.addr[4] = netif->hwaddr[4];
+ netifaddr.addr[5] = netif->hwaddr[5];
+
+ /* Copy struct ip_addr2 to aligned ip_addr, to support compilers without
+ * structure packing (not using structure copy which breaks strict-aliasing rules).
+ */
+ SMEMCPY(&sipaddr, &hdr->sipaddr, sizeof(sipaddr));
+ SMEMCPY(&dipaddr, &hdr->dipaddr, sizeof(dipaddr));
+
+ if ((netif->autoip->state == AUTOIP_STATE_PROBING) ||
+ ((netif->autoip->state == AUTOIP_STATE_ANNOUNCING) &&
+ (netif->autoip->sent_num == 0))) {
+ /* RFC 3927 Section 2.2.1:
+ * from beginning to after ANNOUNCE_WAIT
+ * seconds we have a conflict if
+ * ip.src == llipaddr OR
+ * ip.dst == llipaddr && hw.src != own hwaddr
+ */
+ if ((ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr)) ||
+ (ip_addr_cmp(&dipaddr, &netif->autoip->llipaddr) &&
+ !eth_addr_cmp(&netifaddr, &hdr->shwaddr))) {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
+ ("autoip_arp_reply(): Probe Conflict detected\n"));
+ autoip_start(netif);
+ }
+ } else {
+ /* RFC 3927 Section 2.5:
+ * in any state we have a conflict if
+ * ip.src == llipaddr && hw.src != own hwaddr
+ */
+ if (ip_addr_cmp(&sipaddr, &netif->autoip->llipaddr) &&
+ !eth_addr_cmp(&netifaddr, &hdr->shwaddr)) {
+ LWIP_DEBUGF(AUTOIP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 1,
+ ("autoip_arp_reply(): Conflicting ARP-Packet detected\n"));
+ autoip_handle_arp_conflict(netif);
+ }
+ }
+ }
+}
+
+#endif /* LWIP_AUTOIP */
diff --git a/core/lwip/src/core/ipv4/icmp.c b/core/lwip/src/core/ipv4/icmp.c
new file mode 100644
index 00000000..b97a587a
--- /dev/null
+++ b/core/lwip/src/core/ipv4/icmp.c
@@ -0,0 +1,331 @@
+/**
+ * @file
+ * ICMP - Internet Control Message Protocol
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+/* Some ICMP messages should be passed to the transport protocols. This
+ is not implemented. */
+
+#include "lwip/opt.h"
+
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/icmp.h"
+#include "lwip/inet.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/stats.h"
+#include "lwip/snmp.h"
+
+#include <string.h>
+
+/** Small optimization: set to 0 if incoming PBUF_POOL pbuf always can be
+ * used to modify and send a response packet (and to 1 if this is not the case,
+ * e.g. when link header is stripped of when receiving) */
+#ifndef LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+#define LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN 1
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+
+/* The amount of data from the original packet to return in a dest-unreachable */
+#define ICMP_DEST_UNREACH_DATASIZE 8
+
+static void icmp_send_response(struct pbuf *p, u8_t type, u8_t code);
+
+/**
+ * Processes ICMP input packets, called from ip_input().
+ *
+ * Currently only processes icmp echo requests and sends
+ * out the echo response.
+ *
+ * @param p the icmp echo request packet, p->payload pointing to the ip header
+ * @param inp the netif on which this packet was received
+ */
+void
+icmp_input(struct pbuf *p, struct netif *inp)
+{
+ u8_t type;
+#ifdef LWIP_DEBUG
+ u8_t code;
+#endif /* LWIP_DEBUG */
+ struct icmp_echo_hdr *iecho;
+ struct ip_hdr *iphdr;
+ struct ip_addr tmpaddr;
+ s16_t hlen;
+
+ ICMP_STATS_INC(icmp.recv);
+ snmp_inc_icmpinmsgs();
+
+
+ iphdr = p->payload;
+ hlen = IPH_HL(iphdr) * 4;
+ if (pbuf_header(p, -hlen) || (p->tot_len < sizeof(u16_t)*2)) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: short ICMP (%"U16_F" bytes) received\n", p->tot_len));
+ goto lenerr;
+ }
+
+ type = *((u8_t *)p->payload);
+#ifdef LWIP_DEBUG
+ code = *(((u8_t *)p->payload)+1);
+#endif /* LWIP_DEBUG */
+ switch (type) {
+ case ICMP_ECHO:
+#if !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING
+ {
+ int accepted = 1;
+#if !LWIP_MULTICAST_PING
+ /* multicast destination address? */
+ if (ip_addr_ismulticast(&iphdr->dest)) {
+ accepted = 0;
+ }
+#endif /* LWIP_MULTICAST_PING */
+#if !LWIP_BROADCAST_PING
+ /* broadcast destination address? */
+ if (ip_addr_isbroadcast(&iphdr->dest, inp)) {
+ accepted = 0;
+ }
+#endif /* LWIP_BROADCAST_PING */
+ /* broadcast or multicast destination address not acceptd? */
+ if (!accepted) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: Not echoing to multicast or broadcast pings\n"));
+ ICMP_STATS_INC(icmp.err);
+ pbuf_free(p);
+ return;
+ }
+ }
+#endif /* !LWIP_MULTICAST_PING || !LWIP_BROADCAST_PING */
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
+ if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
+ goto lenerr;
+ }
+ if (inet_chksum_pbuf(p) != 0) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo\n"));
+ pbuf_free(p);
+ ICMP_STATS_INC(icmp.chkerr);
+ snmp_inc_icmpinerrors();
+ return;
+ }
+#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+ if (pbuf_header(p, (PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
+ /* p is not big enough to contain link headers
+ * allocate a new one and copy p into it
+ */
+ struct pbuf *r;
+ /* switch p->payload to ip header */
+ if (pbuf_header(p, hlen)) {
+ LWIP_ASSERT("icmp_input: moving p->payload to ip header failed\n", 0);
+ goto memerr;
+ }
+ /* allocate new packet buffer with space for link headers */
+ r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
+ if (r == NULL) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: allocating new pbuf failed\n"));
+ goto memerr;
+ }
+ LWIP_ASSERT("check that first pbuf can hold struct the ICMP header",
+ (r->len >= hlen + sizeof(struct icmp_echo_hdr)));
+ /* copy the whole packet including ip header */
+ if (pbuf_copy(r, p) != ERR_OK) {
+ LWIP_ASSERT("icmp_input: copying to new pbuf failed\n", 0);
+ goto memerr;
+ }
+ iphdr = r->payload;
+ /* switch r->payload back to icmp header */
+ if (pbuf_header(r, -hlen)) {
+ LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
+ goto memerr;
+ }
+ /* free the original p */
+ pbuf_free(p);
+ /* we now have an identical copy of p that has room for link headers */
+ p = r;
+ } else {
+ /* restore p->payload to point to icmp header */
+ if (pbuf_header(p, -(s16_t)(PBUF_IP_HLEN + PBUF_LINK_HLEN))) {
+ LWIP_ASSERT("icmp_input: restoring original p->payload failed\n", 0);
+ goto memerr;
+ }
+ }
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+ /* At this point, all checks are OK. */
+ /* We generate an answer by switching the dest and src ip addresses,
+ * setting the icmp type to ECHO_RESPONSE and updating the checksum. */
+ iecho = p->payload;
+ tmpaddr.addr = iphdr->src.addr;
+ iphdr->src.addr = iphdr->dest.addr;
+ iphdr->dest.addr = tmpaddr.addr;
+ ICMPH_TYPE_SET(iecho, ICMP_ER);
+ /* adjust the checksum */
+ if (iecho->chksum >= htons(0xffff - (ICMP_ECHO << 8))) {
+ iecho->chksum += htons(ICMP_ECHO << 8) + 1;
+ } else {
+ iecho->chksum += htons(ICMP_ECHO << 8);
+ }
+
+ /* Set the correct TTL and recalculate the header checksum. */
+ IPH_TTL_SET(iphdr, ICMP_TTL);
+ IPH_CHKSUM_SET(iphdr, 0);
+#if CHECKSUM_GEN_IP
+ IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
+#endif /* CHECKSUM_GEN_IP */
+
+ ICMP_STATS_INC(icmp.xmit);
+ /* increase number of messages attempted to send */
+ snmp_inc_icmpoutmsgs();
+ /* increase number of echo replies attempted to send */
+ snmp_inc_icmpoutechoreps();
+
+ if(pbuf_header(p, hlen)) {
+ LWIP_ASSERT("Can't move over header in packet", 0);
+ } else {
+ err_t ret;
+ ret = ip_output_if(p, &(iphdr->src), IP_HDRINCL,
+ ICMP_TTL, 0, IP_PROTO_ICMP, inp);
+ if (ret != ERR_OK) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ip_output_if returned an error: %c.\n", ret));
+ }
+ }
+ break;
+ default:
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" code %"S16_F" not supported.\n",
+ (s16_t)type, (s16_t)code));
+ ICMP_STATS_INC(icmp.proterr);
+ ICMP_STATS_INC(icmp.drop);
+ }
+ pbuf_free(p);
+ return;
+lenerr:
+ pbuf_free(p);
+ ICMP_STATS_INC(icmp.lenerr);
+ snmp_inc_icmpinerrors();
+ return;
+#if LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
+memerr:
+ pbuf_free(p);
+ ICMP_STATS_INC(icmp.err);
+ snmp_inc_icmpinerrors();
+ return;
+#endif /* LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN */
+}
+
+/**
+ * Send an icmp 'destination unreachable' packet, called from ip_input() if
+ * the transport layer protocol is unknown and from udp_input() if the local
+ * port is not bound.
+ *
+ * @param p the input packet for which the 'unreachable' should be sent,
+ * p->payload pointing to the IP header
+ * @param t type of the 'unreachable' packet
+ */
+void
+icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
+{
+ icmp_send_response(p, ICMP_DUR, t);
+}
+
+#if IP_FORWARD || IP_REASSEMBLY
+/**
+ * Send a 'time exceeded' packet, called from ip_forward() if TTL is 0.
+ *
+ * @param p the input packet for which the 'time exceeded' should be sent,
+ * p->payload pointing to the IP header
+ * @param t type of the 'time exceeded' packet
+ */
+void
+icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
+{
+ icmp_send_response(p, ICMP_TE, t);
+}
+
+#endif /* IP_FORWARD || IP_REASSEMBLY */
+
+/**
+ * Send an icmp packet in response to an incoming packet.
+ *
+ * @param p the input packet for which the 'unreachable' should be sent,
+ * p->payload pointing to the IP header
+ * @param type Type of the ICMP header
+ * @param code Code of the ICMP header
+ */
+static void
+icmp_send_response(struct pbuf *p, u8_t type, u8_t code)
+{
+ struct pbuf *q;
+ struct ip_hdr *iphdr;
+ /* we can use the echo header here */
+ struct icmp_echo_hdr *icmphdr;
+
+ /* ICMP header + IP header + 8 bytes of data */
+ q = pbuf_alloc(PBUF_IP, sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE,
+ PBUF_RAM);
+ if (q == NULL) {
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded: failed to allocate pbuf for ICMP packet.\n"));
+ return;
+ }
+ LWIP_ASSERT("check that first pbuf can hold icmp message",
+ (q->len >= (sizeof(struct icmp_echo_hdr) + IP_HLEN + ICMP_DEST_UNREACH_DATASIZE)));
+
+ iphdr = p->payload;
+ LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded from "));
+ ip_addr_debug_print(ICMP_DEBUG, &(iphdr->src));
+ LWIP_DEBUGF(ICMP_DEBUG, (" to "));
+ ip_addr_debug_print(ICMP_DEBUG, &(iphdr->dest));
+ LWIP_DEBUGF(ICMP_DEBUG, ("\n"));
+
+ icmphdr = q->payload;
+ icmphdr->type = type;
+ icmphdr->code = code;
+ icmphdr->id = 0;
+ icmphdr->seqno = 0;
+
+ /* copy fields from original packet */
+ SMEMCPY((u8_t *)q->payload + sizeof(struct icmp_echo_hdr), (u8_t *)p->payload,
+ IP_HLEN + ICMP_DEST_UNREACH_DATASIZE);
+
+ /* calculate checksum */
+ icmphdr->chksum = 0;
+ icmphdr->chksum = inet_chksum(icmphdr, q->len);
+ ICMP_STATS_INC(icmp.xmit);
+ /* increase number of messages attempted to send */
+ snmp_inc_icmpoutmsgs();
+ /* increase number of destination unreachable messages attempted to send */
+ snmp_inc_icmpouttimeexcds();
+ ip_output(q, NULL, &(iphdr->src), ICMP_TTL, 0, IP_PROTO_ICMP);
+ pbuf_free(q);
+}
+
+#endif /* LWIP_ICMP */
diff --git a/core/lwip/src/core/ipv4/igmp.c b/core/lwip/src/core/ipv4/igmp.c
new file mode 100644
index 00000000..7c07bc46
--- /dev/null
+++ b/core/lwip/src/core/ipv4/igmp.c
@@ -0,0 +1,757 @@
+/**
+ * @file
+ * IGMP - Internet Group Management Protocol
+ *
+ */
+
+/*
+ * Copyright (c) 2002 CITEL Technologies Ltd.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of CITEL Technologies Ltd nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CITEL TECHNOLOGIES AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL CITEL TECHNOLOGIES OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * This file is a contribution to the lwIP TCP/IP stack.
+ * The Swedish Institute of Computer Science and Adam Dunkels
+ * are specifically granted permission to redistribute this
+ * source code.
+*/
+
+/*-------------------------------------------------------------
+Note 1)
+Although the rfc requires V1 AND V2 capability
+we will only support v2 since now V1 is very old (August 1989)
+V1 can be added if required
+
+a debug print and statistic have been implemented to
+show this up.
+-------------------------------------------------------------
+-------------------------------------------------------------
+Note 2)
+A query for a specific group address (as opposed to ALLHOSTS)
+has now been implemented as I am unsure if it is required
+
+a debug print and statistic have been implemented to
+show this up.
+-------------------------------------------------------------
+-------------------------------------------------------------
+Note 3)
+The router alert rfc 2113 is implemented in outgoing packets
+but not checked rigorously incoming
+-------------------------------------------------------------
+Steve Reynolds
+------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * RFC 988 - Host extensions for IP multicasting - V0
+ * RFC 1054 - Host extensions for IP multicasting -
+ * RFC 1112 - Host extensions for IP multicasting - V1
+ * RFC 2236 - Internet Group Management Protocol, Version 2 - V2 <- this code is based on this RFC (it's the "de facto" standard)
+ * RFC 3376 - Internet Group Management Protocol, Version 3 - V3
+ * RFC 4604 - Using Internet Group Management Protocol Version 3... - V3+
+ * RFC 2113 - IP Router Alert Option -
+ *----------------------------------------------------------------------------*/
+
+/*-----------------------------------------------------------------------------
+ * Includes
+ *----------------------------------------------------------------------------*/
+
+#include "lwip/opt.h"
+
+#if LWIP_IGMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/igmp.h"
+#include "lwip/debug.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/ip.h"
+#include "lwip/inet.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/icmp.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/stats.h"
+
+#include "string.h"
+
+/*-----------------------------------------------------------------------------
+ * Globales
+ *----------------------------------------------------------------------------*/
+
+static struct igmp_group* igmp_group_list;
+static struct ip_addr allsystems;
+static struct ip_addr allrouters;
+
+/**
+ * Initialize the IGMP module
+ */
+void
+igmp_init(void)
+{
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_init: initializing\n"));
+
+ IP4_ADDR(&allsystems, 224, 0, 0, 1);
+ IP4_ADDR(&allrouters, 224, 0, 0, 2);
+}
+
+#ifdef LWIP_DEBUG
+/**
+ * Dump global IGMP groups list
+ */
+void
+igmp_dump_group_list()
+{
+ struct igmp_group *group = igmp_group_list;
+
+ while (group != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_dump_group_list: [%"U32_F"] ", (u32_t)(group->group_state)));
+ ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface));
+ group = group->next;
+ }
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+}
+#else
+#define igmp_dump_group_list()
+#endif /* LWIP_DEBUG */
+
+/**
+ * Start IGMP processing on interface
+ *
+ * @param netif network interface on which start IGMP processing
+ */
+err_t
+igmp_start(struct netif *netif)
+{
+ struct igmp_group* group;
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: starting IGMP processing on if %p\n", netif));
+
+ group = igmp_lookup_group(netif, &allsystems);
+
+ if (group != NULL) {
+ group->group_state = IGMP_GROUP_IDLE_MEMBER;
+ group->use++;
+
+ /* Allow the igmp messages at the MAC level */
+ if (netif->igmp_mac_filter != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_start: igmp_mac_filter(ADD "));
+ ip_addr_debug_print(IGMP_DEBUG, &allsystems);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter( netif, &allsystems, IGMP_ADD_MAC_FILTER);
+ }
+
+ return ERR_OK;
+ }
+
+ return ERR_MEM;
+}
+
+/**
+ * Stop IGMP processing on interface
+ *
+ * @param netif network interface on which stop IGMP processing
+ */
+err_t
+igmp_stop(struct netif *netif)
+{
+ struct igmp_group *group = igmp_group_list;
+ struct igmp_group *prev = NULL;
+ struct igmp_group *next;
+
+ /* look for groups joined on this interface further down the list */
+ while (group != NULL) {
+ next = group->next;
+ /* is it a group joined on this interface? */
+ if (group->interface == netif) {
+ /* is it the first group of the list? */
+ if (group == igmp_group_list) {
+ igmp_group_list = next;
+ }
+ /* is there a "previous" group defined? */
+ if (prev != NULL) {
+ prev->next = next;
+ }
+ /* disable the group at the MAC level */
+ if (netif->igmp_mac_filter != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_stop: igmp_mac_filter(DEL "));
+ ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, &(group->group_address), IGMP_DEL_MAC_FILTER);
+ }
+ /* free group */
+ memp_free(MEMP_IGMP_GROUP, group);
+ } else {
+ /* change the "previous" */
+ prev = group;
+ }
+ /* move to "next" */
+ group = next;
+ }
+ return ERR_OK;
+}
+
+/**
+ * Report IGMP memberships for this interface
+ *
+ * @param netif network interface on which report IGMP memberships
+ */
+void
+igmp_report_groups( struct netif *netif)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_report_groups: sending IGMP reports on if %p\n", netif));
+
+ while (group != NULL) {
+ if (group->interface == netif) {
+ igmp_delaying_member( group, IGMP_JOIN_DELAYING_MEMBER_TMR);
+ }
+ group = group->next;
+ }
+}
+
+/**
+ * Search for a group in the global igmp_group_list
+ *
+ * @param ifp the network interface for which to look
+ * @param addr the group ip address to search for
+ * @return a struct igmp_group* if the group has been found,
+ * NULL if the group wasn't found.
+ */
+struct igmp_group *
+igmp_lookfor_group(struct netif *ifp, struct ip_addr *addr)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ while (group != NULL) {
+ if ((group->interface == ifp) && (ip_addr_cmp(&(group->group_address), addr))) {
+ return group;
+ }
+ group = group->next;
+ }
+
+ /* to be clearer, we return NULL here instead of
+ * 'group' (which is also NULL at this point).
+ */
+ return NULL;
+}
+
+/**
+ * Search for a specific igmp group and create a new one if not found-
+ *
+ * @param ifp the network interface for which to look
+ * @param addr the group ip address to search
+ * @return a struct igmp_group*,
+ * NULL on memory error.
+ */
+struct igmp_group *
+igmp_lookup_group(struct netif *ifp, struct ip_addr *addr)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ /* Search if the group already exists */
+ group = igmp_lookfor_group(ifp, addr);
+ if (group != NULL) {
+ /* Group already exists. */
+ return group;
+ }
+
+ /* Group doesn't exist yet, create a new one */
+ group = memp_malloc(MEMP_IGMP_GROUP);
+ if (group != NULL) {
+ group->interface = ifp;
+ ip_addr_set(&(group->group_address), addr);
+ group->timer = 0; /* Not running */
+ group->group_state = IGMP_GROUP_NON_MEMBER;
+ group->last_reporter_flag = 0;
+ group->use = 0;
+ group->next = igmp_group_list;
+
+ igmp_group_list = group;
+ }
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_lookup_group: %sallocated a new group with address ", (group?"":"impossible to ")));
+ ip_addr_debug_print(IGMP_DEBUG, addr);
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", ifp));
+
+ return group;
+}
+
+/**
+ * Remove a group in the global igmp_group_list
+ *
+ * @param group the group to remove from the global igmp_group_list
+ * @return ERR_OK if group was removed from the list, an err_t otherwise
+ */
+err_t
+igmp_remove_group(struct igmp_group *group)
+{
+ err_t err = ERR_OK;
+
+ /* Is it the first group? */
+ if (igmp_group_list == group) {
+ igmp_group_list = group->next;
+ } else {
+ /* look for group further down the list */
+ struct igmp_group *tmpGroup;
+ for (tmpGroup = igmp_group_list; tmpGroup != NULL; tmpGroup = tmpGroup->next) {
+ if (tmpGroup->next == group) {
+ tmpGroup->next = group->next;
+ break;
+ }
+ }
+ /* Group not found in the global igmp_group_list */
+ if (tmpGroup == NULL)
+ err = ERR_ARG;
+ }
+ /* free group */
+ memp_free(MEMP_IGMP_GROUP, group);
+
+ return err;
+}
+
+/**
+ * Called from ip_input() if a new IGMP packet is received.
+ *
+ * @param p received igmp packet, p->payload pointing to the ip header
+ * @param inp network interface on which the packet was received
+ * @param dest destination ip address of the igmp packet
+ */
+void
+igmp_input(struct pbuf *p, struct netif *inp, struct ip_addr *dest)
+{
+ struct ip_hdr * iphdr;
+ struct igmp_msg* igmp;
+ struct igmp_group* group;
+ struct igmp_group* groupref;
+
+ /* Note that the length CAN be greater than 8 but only 8 are used - All are included in the checksum */
+ iphdr = p->payload;
+ if (pbuf_header(p, -(s16_t)(IPH_HL(iphdr) * 4)) || (p->len < IGMP_MINLEN)) {
+ pbuf_free(p);
+ IGMP_STATS_INC(igmp.lenerr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: length error\n"));
+ return;
+ }
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: message from "));
+ ip_addr_debug_print(IGMP_DEBUG, &(iphdr->src));
+ LWIP_DEBUGF(IGMP_DEBUG, (" to address "));
+ ip_addr_debug_print(IGMP_DEBUG, &(iphdr->dest));
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", inp));
+
+ /* Now calculate and check the checksum */
+ igmp = (struct igmp_msg *)p->payload;
+ if (inet_chksum(igmp, p->len)) {
+ pbuf_free(p);
+ IGMP_STATS_INC(igmp.chkerr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: checksum error\n"));
+ return;
+ }
+
+ /* Packet is ok so find an existing group */
+ group = igmp_lookfor_group(inp, dest); /* use the incoming IP address! */
+
+ /* If group can be found or create... */
+ if (!group) {
+ pbuf_free(p);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP frame not for us\n"));
+ return;
+ }
+
+ /* NOW ACT ON THE INCOMING MESSAGE TYPE... */
+ switch (igmp->igmp_msgtype) {
+ case IGMP_MEMB_QUERY: {
+ /* IGMP_MEMB_QUERY to the "all systems" address ? */
+ if ((ip_addr_cmp(dest, &allsystems)) && (igmp->igmp_group_address.addr == 0)) {
+ /* THIS IS THE GENERAL QUERY */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: General IGMP_MEMB_QUERY on \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+
+ if (igmp->igmp_maxresp == 0) {
+ IGMP_STATS_INC(igmp.v1_rxed);
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: got an all hosts query with time== 0 - this is V1 and not implemented - treat as v2\n"));
+ igmp->igmp_maxresp = IGMP_V1_DELAYING_MEMBER_TMR;
+ }
+
+ IGMP_STATS_INC(igmp.group_query_rxed);
+ groupref = igmp_group_list;
+ while (groupref) {
+ /* Do not send messages on the all systems group address! */
+ if ((groupref->interface == inp) && (!(ip_addr_cmp(&(groupref->group_address), &allsystems)))) {
+ igmp_delaying_member( groupref, igmp->igmp_maxresp);
+ }
+ groupref = groupref->next;
+ }
+ } else {
+ /* IGMP_MEMB_QUERY to a specific group ? */
+ if (group->group_address.addr != 0) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_MEMB_QUERY to a specific group "));
+ ip_addr_debug_print(IGMP_DEBUG, &group->group_address);
+ if (ip_addr_cmp (dest, &allsystems)) {
+ LWIP_DEBUGF(IGMP_DEBUG, (" using \"ALL SYSTEMS\" address (224.0.0.1) [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+ /* we first need to re-lookfor the group since we used dest last time */
+ group = igmp_lookfor_group(inp, &igmp->igmp_group_address);
+ } else {
+ LWIP_DEBUGF(IGMP_DEBUG, (" with the group address as destination [igmp_maxresp=%i]\n", (int)(igmp->igmp_maxresp)));
+ }
+
+ if (group != NULL) {
+ IGMP_STATS_INC(igmp.unicast_query);
+ igmp_delaying_member( group, igmp->igmp_maxresp);
+ }
+ }
+ }
+ break;
+ }
+ case IGMP_V2_MEMB_REPORT: {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: IGMP_V2_MEMB_REPORT\n"));
+
+ IGMP_STATS_INC(igmp.report_rxed);
+ if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
+ /* This is on a specific group we have already looked up */
+ group->timer = 0; /* stopped */
+ group->group_state = IGMP_GROUP_IDLE_MEMBER;
+ group->last_reporter_flag = 0;
+ }
+ break;
+ }
+ default: {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_input: unexpected msg %d in state %d on group %p on if %p\n",
+ igmp->igmp_msgtype, group->group_state, &group, group->interface));
+ break;
+ }
+ }
+
+ pbuf_free(p);
+ return;
+}
+
+/**
+ * Join a group on one network interface.
+ *
+ * @param ifaddr ip address of the network interface which should join a new group
+ * @param groupaddr the ip address of the group which to join
+ * @return ERR_OK if group was joined on the netif(s), an err_t otherwise
+ */
+err_t
+igmp_joingroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr)
+{
+ err_t err = ERR_VAL; /* no matching interface */
+ struct igmp_group *group;
+ struct netif *netif;
+
+ /* make sure it is multicast address */
+ LWIP_ERROR("igmp_joingroup: attempt to join non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
+ LWIP_ERROR("igmp_joingroup: attempt to join allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+ /* loop through netif's */
+ netif = netif_list;
+ while (netif != NULL) {
+ /* Should we join this interface ? */
+ if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
+ /* find group or create a new one if not found */
+ group = igmp_lookup_group(netif, groupaddr);
+
+ if (group != NULL) {
+ /* This should create a new group, check the state to make sure */
+ if (group->group_state != IGMP_GROUP_NON_MEMBER) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to group not in state IGMP_GROUP_NON_MEMBER\n"));
+ } else {
+ /* OK - it was new group */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: join to new group: "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+ /* If first use of the group, allow the group at the MAC level */
+ if ((group->use==0) && (netif->igmp_mac_filter != NULL)) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: igmp_mac_filter(ADD "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, groupaddr, IGMP_ADD_MAC_FILTER);
+ }
+
+ IGMP_STATS_INC(igmp.join_sent);
+ igmp_send(group, IGMP_V2_MEMB_REPORT);
+
+ igmp_start_timer(group, IGMP_JOIN_DELAYING_MEMBER_TMR);
+
+ /* Need to work out where this timer comes from */
+ group->group_state = IGMP_GROUP_DELAYING_MEMBER;
+ }
+ /* Increment group use */
+ group->use++;
+ /* Join on this interface */
+ err = ERR_OK;
+ } else {
+ /* Return an error even if some network interfaces are joined */
+ /** @todo undo any other netif already joined */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_joingroup: Not enought memory to join to group\n"));
+ return ERR_MEM;
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+
+ return err;
+}
+
+/**
+ * Leave a group on one network interface.
+ *
+ * @param ifaddr ip address of the network interface which should leave a group
+ * @param groupaddr the ip address of the group which to leave
+ * @return ERR_OK if group was left on the netif(s), an err_t otherwise
+ */
+err_t
+igmp_leavegroup(struct ip_addr *ifaddr, struct ip_addr *groupaddr)
+{
+ err_t err = ERR_VAL; /* no matching interface */
+ struct igmp_group *group;
+ struct netif *netif;
+
+ /* make sure it is multicast address */
+ LWIP_ERROR("igmp_leavegroup: attempt to leave non-multicast address", ip_addr_ismulticast(groupaddr), return ERR_VAL;);
+ LWIP_ERROR("igmp_leavegroup: attempt to leave allsystems address", (!ip_addr_cmp(groupaddr, &allsystems)), return ERR_VAL;);
+
+ /* loop through netif's */
+ netif = netif_list;
+ while (netif != NULL) {
+ /* Should we leave this interface ? */
+ if ((netif->flags & NETIF_FLAG_IGMP) && ((ip_addr_isany(ifaddr) || ip_addr_cmp(&(netif->ip_addr), ifaddr)))) {
+ /* find group */
+ group = igmp_lookfor_group(netif, groupaddr);
+
+ if (group != NULL) {
+ /* Only send a leave if the flag is set according to the state diagram */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: Leaving group: "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+ /* If there is no other use of the group */
+ if (group->use <= 1) {
+ /* If we are the last reporter for this group */
+ if (group->last_reporter_flag) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: sending leaving group\n"));
+ IGMP_STATS_INC(igmp.leave_sent);
+ igmp_send(group, IGMP_LEAVE_GROUP);
+ }
+
+ /* Disable the group at the MAC level */
+ if (netif->igmp_mac_filter != NULL) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: igmp_mac_filter(DEL "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, (") on if %p\n", netif));
+ netif->igmp_mac_filter(netif, groupaddr, IGMP_DEL_MAC_FILTER);
+ }
+
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: remove group: "));
+ ip_addr_debug_print(IGMP_DEBUG, groupaddr);
+ LWIP_DEBUGF(IGMP_DEBUG, ("\n"));
+
+ /* Free the group */
+ igmp_remove_group(group);
+ } else {
+ /* Decrement group use */
+ group->use--;
+ }
+ /* Leave on this interface */
+ err = ERR_OK;
+ } else {
+ /* It's not a fatal error on "leavegroup" */
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_leavegroup: not member of group\n"));
+ }
+ }
+ /* proceed to next network interface */
+ netif = netif->next;
+ }
+
+ return err;
+}
+
+/**
+ * The igmp timer function (both for NO_SYS=1 and =0)
+ * Should be called every IGMP_TMR_INTERVAL milliseconds (100 ms is default).
+ */
+void
+igmp_tmr(void)
+{
+ struct igmp_group *group = igmp_group_list;
+
+ while (group != NULL) {
+ if (group->timer != 0) {
+ group->timer -= 1;
+ if (group->timer == 0) {
+ igmp_timeout(group);
+ }
+ }
+ group = group->next;
+ }
+}
+
+/**
+ * Called if a timeout for one group is reached.
+ * Sends a report for this group.
+ *
+ * @param group an igmp_group for which a timeout is reached
+ */
+void
+igmp_timeout(struct igmp_group *group)
+{
+ /* If the state is IGMP_GROUP_DELAYING_MEMBER then we send a report for this group */
+ if (group->group_state == IGMP_GROUP_DELAYING_MEMBER) {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_timeout: report membership for group with address "));
+ ip_addr_debug_print(IGMP_DEBUG, &(group->group_address));
+ LWIP_DEBUGF(IGMP_DEBUG, (" on if %p\n", group->interface));
+
+ igmp_send(group, IGMP_V2_MEMB_REPORT);
+ }
+}
+
+/**
+ * Start a timer for an igmp group
+ *
+ * @param group the igmp_group for which to start a timer
+ * @param max_time the time in multiples of IGMP_TMR_INTERVAL (decrease with
+ * every call to igmp_tmr())
+ */
+void
+igmp_start_timer(struct igmp_group *group, u8_t max_time)
+{
+ /**
+ * @todo Important !! this should be random 0 -> max_time. Find out how to do this
+ */
+ group->timer = max_time;
+}
+
+/**
+ * Stop a timer for an igmp_group
+ *
+ * @param group the igmp_group for which to stop the timer
+ */
+void
+igmp_stop_timer(struct igmp_group *group)
+{
+ group->timer = 0;
+}
+
+/**
+ * Delaying membership report for a group if necessary
+ *
+ * @param group the igmp_group for which "delaying" membership report
+ * @param maxresp query delay
+ */
+void
+igmp_delaying_member( struct igmp_group *group, u8_t maxresp)
+{
+ if ((group->group_state == IGMP_GROUP_IDLE_MEMBER) ||
+ ((group->group_state == IGMP_GROUP_DELAYING_MEMBER) && (maxresp > group->timer))) {
+ igmp_start_timer(group, (maxresp)/2);
+ group->group_state = IGMP_GROUP_DELAYING_MEMBER;
+ }
+}
+
+
+/**
+ * Sends an IP packet on a network interface. This function constructs the IP header
+ * and calculates the IP header checksum. If the source IP address is NULL,
+ * the IP address of the outgoing network interface is filled in as source address.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ * @param netif the netif on which to send this packet
+ * @return ERR_OK if the packet was sent OK
+ * ERR_BUF if p doesn't have enough space for IP/LINK headers
+ * returns errors returned by netif->output
+ */
+err_t
+igmp_ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t proto, struct netif *netif)
+{
+ /* This is the "router alert" option */
+ u16_t ra[2];
+ ra[0] = htons (ROUTER_ALERT);
+ ra[1] = 0x0000; /* Router shall examine packet */
+ return ip_output_if_opt(p, src, dest, ttl, 0, proto, netif, ra, ROUTER_ALERTLEN);
+}
+
+/**
+ * Send an igmp packet to a specific group.
+ *
+ * @param group the group to which to send the packet
+ * @param type the type of igmp packet to send
+ */
+void
+igmp_send(struct igmp_group *group, u8_t type)
+{
+ struct pbuf* p = NULL;
+ struct igmp_msg* igmp = NULL;
+ struct ip_addr src = {0};
+ struct ip_addr* dest = NULL;
+
+ /* IP header + "router alert" option + IGMP header */
+ p = pbuf_alloc(PBUF_TRANSPORT, IGMP_MINLEN, PBUF_RAM);
+
+ if (p) {
+ igmp = p->payload;
+ LWIP_ASSERT("igmp_send: check that first pbuf can hold struct igmp_msg",
+ (p->len >= sizeof(struct igmp_msg)));
+ ip_addr_set(&src, &((group->interface)->ip_addr));
+
+ if (type == IGMP_V2_MEMB_REPORT) {
+ dest = &(group->group_address);
+ IGMP_STATS_INC(igmp.report_sent);
+ ip_addr_set(&(igmp->igmp_group_address), &(group->group_address));
+ group->last_reporter_flag = 1; /* Remember we were the last to report */
+ } else {
+ if (type == IGMP_LEAVE_GROUP) {
+ dest = &allrouters;
+ ip_addr_set(&(igmp->igmp_group_address), &(group->group_address));
+ }
+ }
+
+ if ((type == IGMP_V2_MEMB_REPORT) || (type == IGMP_LEAVE_GROUP)) {
+ igmp->igmp_msgtype = type;
+ igmp->igmp_maxresp = 0;
+ igmp->igmp_checksum = 0;
+ igmp->igmp_checksum = inet_chksum( igmp, IGMP_MINLEN);
+
+ igmp_ip_output_if(p, &src, dest, IGMP_TTL, IP_PROTO_IGMP, group->interface);
+ }
+
+ pbuf_free(p);
+ } else {
+ LWIP_DEBUGF(IGMP_DEBUG, ("igmp_send: not enough memory for igmp_send\n"));
+ }
+}
+
+#endif /* LWIP_IGMP */
diff --git a/core/lwip/src/core/ipv4/inet.c b/core/lwip/src/core/ipv4/inet.c
new file mode 100644
index 00000000..69baf1d5
--- /dev/null
+++ b/core/lwip/src/core/ipv4/inet.c
@@ -0,0 +1,278 @@
+/**
+ * @file
+ * Functions common to all TCP/IPv4 modules, such as the byte order functions.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/inet.h"
+
+/* Here for now until needed in other places in lwIP */
+#ifndef isprint
+#define in_range(c, lo, up) ((u8_t)c >= lo && (u8_t)c <= up)
+#define isprint(c) in_range(c, 0x20, 0x7f)
+#define isdigit(c) in_range(c, '0', '9')
+#define isxdigit(c) (isdigit(c) || in_range(c, 'a', 'f') || in_range(c, 'A', 'F'))
+#define islower(c) in_range(c, 'a', 'z')
+#define isspace(c) (c == ' ' || c == '\f' || c == '\n' || c == '\r' || c == '\t' || c == '\v')
+#endif
+
+/**
+ * Ascii internet address interpretation routine.
+ * The value returned is in network order.
+ *
+ * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
+ * @return ip address in network order
+ */
+u32_t
+inet_addr(const char *cp)
+{
+ struct in_addr val;
+
+ if (inet_aton(cp, &val)) {
+ return (val.s_addr);
+ }
+ return (INADDR_NONE);
+}
+
+/**
+ * Check whether "cp" is a valid ascii representation
+ * of an Internet address and convert to a binary address.
+ * Returns 1 if the address is valid, 0 if not.
+ * This replaces inet_addr, the return value from which
+ * cannot distinguish between failure and a local broadcast address.
+ *
+ * @param cp IP address in ascii represenation (e.g. "127.0.0.1")
+ * @param addr pointer to which to save the ip address in network order
+ * @return 1 if cp could be converted to addr, 0 on failure
+ */
+int
+inet_aton(const char *cp, struct in_addr *addr)
+{
+ u32_t val;
+ u8_t base;
+ char c;
+ u32_t parts[4];
+ u32_t *pp = parts;
+
+ c = *cp;
+ for (;;) {
+ /*
+ * Collect number up to ``.''.
+ * Values are specified as for C:
+ * 0x=hex, 0=octal, 1-9=decimal.
+ */
+ if (!isdigit(c))
+ return (0);
+ val = 0;
+ base = 10;
+ if (c == '0') {
+ c = *++cp;
+ if (c == 'x' || c == 'X') {
+ base = 16;
+ c = *++cp;
+ } else
+ base = 8;
+ }
+ for (;;) {
+ if (isdigit(c)) {
+ val = (val * base) + (int)(c - '0');
+ c = *++cp;
+ } else if (base == 16 && isxdigit(c)) {
+ val = (val << 4) | (int)(c + 10 - (islower(c) ? 'a' : 'A'));
+ c = *++cp;
+ } else
+ break;
+ }
+ if (c == '.') {
+ /*
+ * Internet format:
+ * a.b.c.d
+ * a.b.c (with c treated as 16 bits)
+ * a.b (with b treated as 24 bits)
+ */
+ if (pp >= parts + 3)
+ return (0);
+ *pp++ = val;
+ c = *++cp;
+ } else
+ break;
+ }
+ /*
+ * Check for trailing characters.
+ */
+ if (c != '\0' && !isspace(c))
+ return (0);
+ /*
+ * Concoct the address according to
+ * the number of parts specified.
+ */
+ switch (pp - parts + 1) {
+
+ case 0:
+ return (0); /* initial nondigit */
+
+ case 1: /* a -- 32 bits */
+ break;
+
+ case 2: /* a.b -- 8.24 bits */
+ if (val > 0xffffffUL)
+ return (0);
+ val |= parts[0] << 24;
+ break;
+
+ case 3: /* a.b.c -- 8.8.16 bits */
+ if (val > 0xffff)
+ return (0);
+ val |= (parts[0] << 24) | (parts[1] << 16);
+ break;
+
+ case 4: /* a.b.c.d -- 8.8.8.8 bits */
+ if (val > 0xff)
+ return (0);
+ val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+ break;
+ }
+ if (addr)
+ addr->s_addr = htonl(val);
+ return (1);
+}
+
+/**
+ * Convert numeric IP address into decimal dotted ASCII representation.
+ * returns ptr to static buffer; not reentrant!
+ *
+ * @param addr ip address in network order to convert
+ * @return pointer to a global static (!) buffer that holds the ASCII
+ * represenation of addr
+ */
+char *
+inet_ntoa(struct in_addr addr)
+{
+ static char str[16];
+ u32_t s_addr = addr.s_addr;
+ char inv[3];
+ char *rp;
+ u8_t *ap;
+ u8_t rem;
+ u8_t n;
+ u8_t i;
+
+ rp = str;
+ ap = (u8_t *)&s_addr;
+ for(n = 0; n < 4; n++) {
+ i = 0;
+ do {
+ rem = *ap % (u8_t)10;
+ *ap /= (u8_t)10;
+ inv[i++] = '0' + rem;
+ } while(*ap);
+ while(i--)
+ *rp++ = inv[i];
+ *rp++ = '.';
+ ap++;
+ }
+ *--rp = 0;
+ return str;
+}
+
+/**
+ * These are reference implementations of the byte swapping functions.
+ * Again with the aim of being simple, correct and fully portable.
+ * Byte swapping is the second thing you would want to optimize. You will
+ * need to port it to your architecture and in your cc.h:
+ *
+ * #define LWIP_PLATFORM_BYTESWAP 1
+ * #define LWIP_PLATFORM_HTONS(x) <your_htons>
+ * #define LWIP_PLATFORM_HTONL(x) <your_htonl>
+ *
+ * Note ntohs() and ntohl() are merely references to the htonx counterparts.
+ */
+
+#if (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN)
+
+/**
+ * Convert an u16_t from host- to network byte order.
+ *
+ * @param n u16_t in host byte order
+ * @return n in network byte order
+ */
+u16_t
+htons(u16_t n)
+{
+ return ((n & 0xff) << 8) | ((n & 0xff00) >> 8);
+}
+
+/**
+ * Convert an u16_t from network- to host byte order.
+ *
+ * @param n u16_t in network byte order
+ * @return n in host byte order
+ */
+u16_t
+ntohs(u16_t n)
+{
+ return htons(n);
+}
+
+/**
+ * Convert an u32_t from host- to network byte order.
+ *
+ * @param n u32_t in host byte order
+ * @return n in network byte order
+ */
+u32_t
+htonl(u32_t n)
+{
+ return ((n & 0xff) << 24) |
+ ((n & 0xff00) << 8) |
+ ((n & 0xff0000UL) >> 8) |
+ ((n & 0xff000000UL) >> 24);
+}
+
+/**
+ * Convert an u32_t from network- to host byte order.
+ *
+ * @param n u32_t in network byte order
+ * @return n in host byte order
+ */
+u32_t
+ntohl(u32_t n)
+{
+ return htonl(n);
+}
+
+#endif /* (LWIP_PLATFORM_BYTESWAP == 0) && (BYTE_ORDER == LITTLE_ENDIAN) */
diff --git a/core/lwip/src/core/ipv4/inet_chksum.c b/core/lwip/src/core/ipv4/inet_chksum.c
new file mode 100644
index 00000000..185881ef
--- /dev/null
+++ b/core/lwip/src/core/ipv4/inet_chksum.c
@@ -0,0 +1,438 @@
+/**
+ * @file
+ * Incluse internet checksum functions.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/inet_chksum.h"
+#include "lwip/inet.h"
+
+#include <stddef.h>
+
+/* These are some reference implementations of the checksum algorithm, with the
+ * aim of being simple, correct and fully portable. Checksumming is the
+ * first thing you would want to optimize for your platform. If you create
+ * your own version, link it in and in your cc.h put:
+ *
+ * #define LWIP_CHKSUM <your_checksum_routine>
+ *
+ * Or you can select from the implementations below by defining
+ * LWIP_CHKSUM_ALGORITHM to 1, 2 or 3.
+ */
+
+#ifndef LWIP_CHKSUM
+# define LWIP_CHKSUM lwip_standard_chksum
+# ifndef LWIP_CHKSUM_ALGORITHM
+# define LWIP_CHKSUM_ALGORITHM 1
+# endif
+#endif
+/* If none set: */
+#ifndef LWIP_CHKSUM_ALGORITHM
+# define LWIP_CHKSUM_ALGORITHM 0
+#endif
+
+/** Like the name says... */
+#if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
+/* little endian and PLATFORM_BYTESWAP defined */
+#define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(w)
+#else
+/* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
+#define SWAP_BYTES_IN_WORD(w) ((w & 0xff) << 8) | ((w & 0xff00) >> 8)
+#endif
+
+/** Split an u32_t in two u16_ts and add them up */
+#define FOLD_U32T(u) ((u >> 16) + (u & 0x0000ffffUL))
+
+#if (LWIP_CHKSUM_ALGORITHM == 1) /* Version #1 */
+/**
+ * lwip checksum
+ *
+ * @param dataptr points to start of data to be summed at any boundary
+ * @param len length of data to be summed
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ *
+ * @note accumulator size limits summable length to 64k
+ * @note host endianess is irrelevant (p3 RFC1071)
+ */
+static u16_t
+lwip_standard_chksum(void *dataptr, u16_t len)
+{
+ u32_t acc;
+ u16_t src;
+ u8_t *octetptr;
+
+ acc = 0;
+ /* dataptr may be at odd or even addresses */
+ octetptr = (u8_t*)dataptr;
+ while (len > 1) {
+ /* declare first octet as most significant
+ thus assume network order, ignoring host order */
+ src = (*octetptr) << 8;
+ octetptr++;
+ /* declare second octet as least significant */
+ src |= (*octetptr);
+ octetptr++;
+ acc += src;
+ len -= 2;
+ }
+ if (len > 0) {
+ /* accumulate remaining octet */
+ src = (*octetptr) << 8;
+ acc += src;
+ }
+ /* add deferred carry bits */
+ acc = (acc >> 16) + (acc & 0x0000ffffUL);
+ if ((acc & 0xffff0000UL) != 0) {
+ acc = (acc >> 16) + (acc & 0x0000ffffUL);
+ }
+ /* This maybe a little confusing: reorder sum using htons()
+ instead of ntohs() since it has a little less call overhead.
+ The caller must invert bits for Internet sum ! */
+ return htons((u16_t)acc);
+}
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 2) /* Alternative version #2 */
+/*
+ * Curt McDowell
+ * Broadcom Corp.
+ * csm@broadcom.com
+ *
+ * IP checksum two bytes at a time with support for
+ * unaligned buffer.
+ * Works for len up to and including 0x20000.
+ * by Curt McDowell, Broadcom Corp. 12/08/2005
+ *
+ * @param dataptr points to start of data to be summed at any boundary
+ * @param len length of data to be summed
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ */
+
+static u16_t
+lwip_standard_chksum(void *dataptr, int len)
+{
+ u8_t *pb = dataptr;
+ u16_t *ps, t = 0;
+ u32_t sum = 0;
+ int odd = ((u32_t)pb & 1);
+
+ /* Get aligned to u16_t */
+ if (odd && len > 0) {
+ ((u8_t *)&t)[1] = *pb++;
+ len--;
+ }
+
+ /* Add the bulk of the data */
+ ps = (u16_t *)pb;
+ while (len > 1) {
+ sum += *ps++;
+ len -= 2;
+ }
+
+ /* Consume left-over byte, if any */
+ if (len > 0) {
+ ((u8_t *)&t)[0] = *(u8_t *)ps;;
+ }
+
+ /* Add end bytes */
+ sum += t;
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ sum = FOLD_U32T(sum);
+ sum = FOLD_U32T(sum);
+
+ /* Swap if alignment was odd */
+ if (odd) {
+ sum = SWAP_BYTES_IN_WORD(sum);
+ }
+
+ return sum;
+}
+#endif
+
+#if (LWIP_CHKSUM_ALGORITHM == 3) /* Alternative version #3 */
+/**
+ * An optimized checksum routine. Basically, it uses loop-unrolling on
+ * the checksum loop, treating the head and tail bytes specially, whereas
+ * the inner loop acts on 8 bytes at a time.
+ *
+ * @arg start of buffer to be checksummed. May be an odd byte address.
+ * @len number of bytes in the buffer to be checksummed.
+ * @return host order (!) lwip checksum (non-inverted Internet sum)
+ *
+ * by Curt McDowell, Broadcom Corp. December 8th, 2005
+ */
+
+static u16_t
+lwip_standard_chksum(void *dataptr, int len)
+{
+ u8_t *pb = dataptr;
+ u16_t *ps, t = 0;
+ u32_t *pl;
+ u32_t sum = 0, tmp;
+ /* starts at odd byte address? */
+ int odd = ((u32_t)pb & 1);
+
+ if (odd && len > 0) {
+ ((u8_t *)&t)[1] = *pb++;
+ len--;
+ }
+
+ ps = (u16_t *)pb;
+
+ if (((u32_t)ps & 3) && len > 1) {
+ sum += *ps++;
+ len -= 2;
+ }
+
+ pl = (u32_t *)ps;
+
+ while (len > 7) {
+ tmp = sum + *pl++; /* ping */
+ if (tmp < sum) {
+ tmp++; /* add back carry */
+ }
+
+ sum = tmp + *pl++; /* pong */
+ if (sum < tmp) {
+ sum++; /* add back carry */
+ }
+
+ len -= 8;
+ }
+
+ /* make room in upper bits */
+ sum = FOLD_U32T(sum);
+
+ ps = (u16_t *)pl;
+
+ /* 16-bit aligned word remaining? */
+ while (len > 1) {
+ sum += *ps++;
+ len -= 2;
+ }
+
+ /* dangling tail byte remaining? */
+ if (len > 0) { /* include odd byte */
+ ((u8_t *)&t)[0] = *(u8_t *)ps;
+ }
+
+ sum += t; /* add end bytes */
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ sum = FOLD_U32T(sum);
+ sum = FOLD_U32T(sum);
+
+ if (odd) {
+ sum = SWAP_BYTES_IN_WORD(sum);
+ }
+
+ return sum;
+}
+#endif
+
+/* inet_chksum_pseudo:
+ *
+ * Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pseudo(struct pbuf *p,
+ struct ip_addr *src, struct ip_addr *dest,
+ u8_t proto, u16_t proto_len)
+{
+ u32_t acc;
+ struct pbuf *q;
+ u8_t swapped;
+
+ acc = 0;
+ swapped = 0;
+ /* iterate through all pbuf in chain */
+ for(q = p; q != NULL; q = q->next) {
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
+ (void *)q, (void *)q->next));
+ acc += LWIP_CHKSUM(q->payload, q->len);
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ /* just executing this next line is probably faster that the if statement needed
+ to check whether we really need to execute it, and does no harm */
+ acc = FOLD_U32T(acc);
+ if (q->len % 2 != 0) {
+ swapped = 1 - swapped;
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ }
+
+ if (swapped) {
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ acc += (src->addr & 0xffffUL);
+ acc += ((src->addr >> 16) & 0xffffUL);
+ acc += (dest->addr & 0xffffUL);
+ acc += ((dest->addr >> 16) & 0xffffUL);
+ acc += (u32_t)htons((u16_t)proto);
+ acc += (u32_t)htons(proto_len);
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ acc = FOLD_U32T(acc);
+ acc = FOLD_U32T(acc);
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"X32_F"\n", acc));
+ return (u16_t)~(acc & 0xffffUL);
+}
+
+/* inet_chksum_pseudo:
+ *
+ * Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ * IP addresses are expected to be in network byte order.
+ *
+ * @param p chain of pbufs over that a checksum should be calculated (ip data part)
+ * @param src source ip address (used for checksum of pseudo header)
+ * @param dst destination ip address (used for checksum of pseudo header)
+ * @param proto ip protocol (used for checksum of pseudo header)
+ * @param proto_len length of the ip data part (used for checksum of pseudo header)
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+/* Currently only used by UDPLITE, although this could change in the future. */
+#if LWIP_UDPLITE
+u16_t
+inet_chksum_pseudo_partial(struct pbuf *p,
+ struct ip_addr *src, struct ip_addr *dest,
+ u8_t proto, u16_t proto_len, u16_t chksum_len)
+{
+ u32_t acc;
+ struct pbuf *q;
+ u8_t swapped;
+ u16_t chklen;
+
+ acc = 0;
+ swapped = 0;
+ /* iterate through all pbuf in chain */
+ for(q = p; (q != NULL) && (chksum_len > 0); q = q->next) {
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): checksumming pbuf %p (has next %p) \n",
+ (void *)q, (void *)q->next));
+ chklen = q->len;
+ if (chklen > chksum_len) {
+ chklen = chksum_len;
+ }
+ acc += LWIP_CHKSUM(q->payload, chklen);
+ chksum_len -= chklen;
+ LWIP_ASSERT("delete me", chksum_len < 0x7fff);
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): unwrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ /* fold the upper bit down */
+ acc = FOLD_U32T(acc);
+ if (q->len % 2 != 0) {
+ swapped = 1 - swapped;
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ /*LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): wrapped lwip_chksum()=%"X32_F" \n", acc));*/
+ }
+
+ if (swapped) {
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ acc += (src->addr & 0xffffUL);
+ acc += ((src->addr >> 16) & 0xffffUL);
+ acc += (dest->addr & 0xffffUL);
+ acc += ((dest->addr >> 16) & 0xffffUL);
+ acc += (u32_t)htons((u16_t)proto);
+ acc += (u32_t)htons(proto_len);
+
+ /* Fold 32-bit sum to 16 bits
+ calling this twice is propably faster than if statements... */
+ acc = FOLD_U32T(acc);
+ acc = FOLD_U32T(acc);
+ LWIP_DEBUGF(INET_DEBUG, ("inet_chksum_pseudo(): pbuf chain lwip_chksum()=%"X32_F"\n", acc));
+ return (u16_t)~(acc & 0xffffUL);
+}
+#endif /* LWIP_UDPLITE */
+
+/* inet_chksum:
+ *
+ * Calculates the Internet checksum over a portion of memory. Used primarily for IP
+ * and ICMP.
+ *
+ * @param dataptr start of the buffer to calculate the checksum (no alignment needed)
+ * @param len length of the buffer to calculate the checksum
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+
+u16_t
+inet_chksum(void *dataptr, u16_t len)
+{
+ return ~LWIP_CHKSUM(dataptr, len);
+}
+
+/**
+ * Calculate a checksum over a chain of pbufs (without pseudo-header, much like
+ * inet_chksum only pbufs are used).
+ *
+ * @param p pbuf chain over that the checksum should be calculated
+ * @return checksum (as u16_t) to be saved directly in the protocol header
+ */
+u16_t
+inet_chksum_pbuf(struct pbuf *p)
+{
+ u32_t acc;
+ struct pbuf *q;
+ u8_t swapped;
+
+ acc = 0;
+ swapped = 0;
+ for(q = p; q != NULL; q = q->next) {
+ acc += LWIP_CHKSUM(q->payload, q->len);
+ acc = FOLD_U32T(acc);
+ if (q->len % 2 != 0) {
+ swapped = 1 - swapped;
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ }
+
+ if (swapped) {
+ acc = SWAP_BYTES_IN_WORD(acc);
+ }
+ return (u16_t)~(acc & 0xffffUL);
+}
diff --git a/core/lwip/src/core/ipv4/ip.c b/core/lwip/src/core/ipv4/ip.c
new file mode 100644
index 00000000..7e404a9f
--- /dev/null
+++ b/core/lwip/src/core/ipv4/ip.c
@@ -0,0 +1,749 @@
+/**
+ * @file
+ * This is the IPv4 layer implementation for incoming and outgoing IP traffic.
+ *
+ * @see ip_frag.c
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/ip_frag.h"
+#include "lwip/inet.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/icmp.h"
+#include "lwip/igmp.h"
+#include "lwip/raw.h"
+#include "lwip/udp.h"
+#include "lwip/tcp.h"
+#include "lwip/snmp.h"
+#include "lwip/dhcp.h"
+#include "lwip/stats.h"
+#include "arch/perf.h"
+
+#include <string.h>
+
+/**
+ * The interface that provided the packet for the current callback
+ * invocation.
+ */
+static struct netif *current_netif;
+
+/**
+ * Header of the input packet currently being processed.
+ */
+static const struct ip_hdr *current_header;
+
+/**
+ * Get the interface that received the current packet.
+ *
+ * This function must only be called from a receive callback (udp_recv,
+ * raw_recv, tcp_accept). It will return NULL otherwise.
+ *
+ * @param pcb Pointer to the pcb receiving a packet.
+ */
+struct netif *
+ip_current_netif(void)
+{
+ return current_netif;
+}
+
+/**
+ * Get the IP header of the current packet.
+ *
+ * This function must only be called from a receive callback (udp_recv,
+ * raw_recv, tcp_accept). It will return NULL otherwise.
+ *
+ * @param pcb Pointer to the pcb receiving a packet.
+ */
+const struct ip_hdr *
+ip_current_header(void)
+{
+ return current_header;
+}
+
+/**
+ * Finds the appropriate network interface for a given IP address. It
+ * searches the list of network interfaces linearly. A match is found
+ * if the masked IP address of the network interface equals the masked
+ * IP address given to the function.
+ *
+ * @param dest the destination IP address for which to find the route
+ * @return the netif on which to send to reach dest
+ */
+struct netif *
+ip_route(struct ip_addr *dest)
+{
+ struct netif *netif;
+
+ /* iterate through netifs */
+ for(netif = netif_list; netif != NULL; netif = netif->next) {
+ /* network mask matches? */
+ if (netif_is_up(netif)) {
+ if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
+ /* return netif on which to forward IP packet */
+ return netif;
+ }
+ }
+ }
+ if ((netif_default == NULL) || (!netif_is_up(netif_default))) {
+ LWIP_DEBUGF(IP_DEBUG | 2, ("ip_route: No route to 0x%"X32_F"\n", dest->addr));
+ IP_STATS_INC(ip.rterr);
+ snmp_inc_ipoutnoroutes();
+ return NULL;
+ }
+ /* no matching netif found, use default netif */
+ return netif_default;
+}
+
+#if IP_FORWARD
+/**
+ * Forwards an IP packet. It finds an appropriate route for the
+ * packet, decrements the TTL value of the packet, adjusts the
+ * checksum and outputs the packet on the appropriate interface.
+ *
+ * @param p the packet to forward (p->payload points to IP header)
+ * @param iphdr the IP header of the input packet
+ * @param inp the netif on which this packet was received
+ * @return the netif on which the packet was sent (NULL if it wasn't sent)
+ */
+static struct netif *
+ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
+{
+ struct netif *netif;
+
+ PERF_START;
+ /* Find network interface where to forward this IP packet to. */
+ netif = ip_route((struct ip_addr *)&(iphdr->dest));
+ if (netif == NULL) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for 0x%"X32_F" found\n",
+ iphdr->dest.addr));
+ snmp_inc_ipoutnoroutes();
+ return (struct netif *)NULL;
+ }
+ /* Do not forward packets onto the same network interface on which
+ * they arrived. */
+ if (netif == inp) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
+ snmp_inc_ipoutnoroutes();
+ return (struct netif *)NULL;
+ }
+
+ /* decrement TTL */
+ IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
+ /* send ICMP if TTL == 0 */
+ if (IPH_TTL(iphdr) == 0) {
+ snmp_inc_ipinhdrerrors();
+#if LWIP_ICMP
+ /* Don't send ICMP messages in response to ICMP messages */
+ if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
+ icmp_time_exceeded(p, ICMP_TE_TTL);
+ }
+#endif /* LWIP_ICMP */
+ return (struct netif *)NULL;
+ }
+
+ /* Incrementally update the IP checksum. */
+ if (IPH_CHKSUM(iphdr) >= htons(0xffff - 0x100)) {
+ IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100) + 1);
+ } else {
+ IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + htons(0x100));
+ }
+
+ LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to 0x%"X32_F"\n",
+ iphdr->dest.addr));
+
+ IP_STATS_INC(ip.fw);
+ IP_STATS_INC(ip.xmit);
+ snmp_inc_ipforwdatagrams();
+
+ PERF_STOP("ip_forward");
+ /* transmit pbuf on chosen interface */
+ netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
+ return netif;
+}
+#endif /* IP_FORWARD */
+
+/**
+ * This function is called by the network interface device driver when
+ * an IP packet is received. The function does the basic checks of the
+ * IP header such as packet size being at least larger than the header
+ * size etc. If the packet was not destined for us, the packet is
+ * forwarded (using ip_forward). The IP checksum is always checked.
+ *
+ * Finally, the packet is sent to the upper layer protocol input function.
+ *
+ * @param p the received IP packet (p->payload points to IP header)
+ * @param inp the netif on which this packet was received
+ * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
+ * processed, but currently always returns ERR_OK)
+ */
+err_t
+ip_input(struct pbuf *p, struct netif *inp)
+{
+ struct ip_hdr *iphdr;
+ struct netif *netif;
+ u16_t iphdr_hlen;
+ u16_t iphdr_len;
+#if LWIP_DHCP
+ int check_ip_src=1;
+#endif /* LWIP_DHCP */
+
+ IP_STATS_INC(ip.recv);
+ snmp_inc_ipinreceives();
+
+ /* identify the IP header */
+ iphdr = p->payload;
+ if (IPH_V(iphdr) != 4) {
+ LWIP_DEBUGF(IP_DEBUG | 1, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
+ ip_debug_print(p);
+ pbuf_free(p);
+ IP_STATS_INC(ip.err);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinhdrerrors();
+ return ERR_OK;
+ }
+
+ /* obtain IP header length in number of 32-bit words */
+ iphdr_hlen = IPH_HL(iphdr);
+ /* calculate IP header length in bytes */
+ iphdr_hlen *= 4;
+ /* obtain ip length in bytes */
+ iphdr_len = ntohs(IPH_LEN(iphdr));
+
+ /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
+ if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
+ if (iphdr_hlen > p->len)
+ LWIP_DEBUGF(IP_DEBUG | 2, ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
+ iphdr_hlen, p->len));
+ if (iphdr_len > p->tot_len)
+ LWIP_DEBUGF(IP_DEBUG | 2, ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), "
+ "IP packet dropped.\n",
+ iphdr_len, p->tot_len));
+ /* free (drop) packet pbufs */
+ pbuf_free(p);
+ IP_STATS_INC(ip.lenerr);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipindiscards();
+ return ERR_OK;
+ }
+
+ /* verify checksum */
+#if CHECKSUM_CHECK_IP
+ if (inet_chksum(iphdr, iphdr_hlen) != 0) {
+
+ LWIP_DEBUGF(IP_DEBUG | 2, ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
+ ip_debug_print(p);
+ pbuf_free(p);
+ IP_STATS_INC(ip.chkerr);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinhdrerrors();
+ return ERR_OK;
+ }
+#endif
+
+ /* Trim pbuf. This should have been done at the netif layer,
+ * but we'll do it anyway just to be sure that its done. */
+ pbuf_realloc(p, iphdr_len);
+
+ /* match packet against an interface, i.e. is this packet for us? */
+#if LWIP_IGMP
+ if (ip_addr_ismulticast(&(iphdr->dest))) {
+ if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &(iphdr->dest)))) {
+ netif = inp;
+ } else {
+ netif = NULL;
+ }
+ } else
+#endif /* LWIP_IGMP */
+ {
+ /* start trying with inp. if that's not acceptable, start walking the
+ list of configured netifs.
+ 'first' is used as a boolean to mark whether we started walking the list */
+ int first = 1;
+ netif = inp;
+ do {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest 0x%"X32_F" netif->ip_addr 0x%"X32_F" (0x%"X32_F", 0x%"X32_F", 0x%"X32_F")\n",
+ iphdr->dest.addr, netif->ip_addr.addr,
+ iphdr->dest.addr & netif->netmask.addr,
+ netif->ip_addr.addr & netif->netmask.addr,
+ iphdr->dest.addr & ~(netif->netmask.addr)));
+
+ /* interface is up and configured? */
+ if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
+ /* unicast to this interface address? */
+ if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr)) ||
+ /* or broadcast on this interface network address? */
+ ip_addr_isbroadcast(&(iphdr->dest), netif)) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
+ netif->name[0], netif->name[1]));
+ /* break out of for loop */
+ break;
+ }
+ }
+ if (first) {
+ first = 0;
+ netif = netif_list;
+ } else {
+ netif = netif->next;
+ }
+ if (netif == inp) {
+ netif = netif->next;
+ }
+ } while(netif != NULL);
+ }
+
+#if LWIP_DHCP
+ /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
+ * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
+ * According to RFC 1542 section 3.1.1, referred by RFC 2131).
+ */
+ if (netif == NULL) {
+ /* remote port is DHCP server? */
+ if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
+ ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest)));
+ if (ntohs(((struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen))->dest) == DHCP_CLIENT_PORT) {
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: DHCP packet accepted.\n"));
+ netif = inp;
+ check_ip_src = 0;
+ }
+ }
+ }
+#endif /* LWIP_DHCP */
+
+ /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
+#if LWIP_DHCP
+ if (check_ip_src)
+#endif /* LWIP_DHCP */
+ { if ((ip_addr_isbroadcast(&(iphdr->src), inp)) ||
+ (ip_addr_ismulticast(&(iphdr->src)))) {
+ /* packet source is not valid */
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet source is not valid.\n"));
+ /* free (drop) packet pbufs */
+ pbuf_free(p);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinaddrerrors();
+ snmp_inc_ipindiscards();
+ return ERR_OK;
+ }
+ }
+
+ /* packet not for us? */
+ if (netif == NULL) {
+ /* packet not for us, route or discard */
+ LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | 1, ("ip_input: packet not for us.\n"));
+#if IP_FORWARD
+ /* non-broadcast packet? */
+ if (!ip_addr_isbroadcast(&(iphdr->dest), inp)) {
+ /* try to forward IP packet on (other) interfaces */
+ ip_forward(p, iphdr, inp);
+ } else
+#endif /* IP_FORWARD */
+ {
+ snmp_inc_ipinaddrerrors();
+ snmp_inc_ipindiscards();
+ }
+ pbuf_free(p);
+ return ERR_OK;
+ }
+ /* packet consists of multiple fragments? */
+ if ((IPH_OFFSET(iphdr) & htons(IP_OFFMASK | IP_MF)) != 0) {
+#if IP_REASSEMBLY /* packet fragment reassembly code present? */
+ LWIP_DEBUGF(IP_DEBUG, ("IP packet is a fragment (id=0x%04"X16_F" tot_len=%"U16_F" len=%"U16_F" MF=%"U16_F" offset=%"U16_F"), calling ip_reass()\n",
+ ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & htons(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
+ /* reassemble the packet*/
+ p = ip_reass(p);
+ /* packet not fully reassembled yet? */
+ if (p == NULL) {
+ return ERR_OK;
+ }
+ iphdr = p->payload;
+#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
+ pbuf_free(p);
+ LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
+ ntohs(IPH_OFFSET(iphdr))));
+ IP_STATS_INC(ip.opterr);
+ IP_STATS_INC(ip.drop);
+ /* unsupported protocol feature */
+ snmp_inc_ipinunknownprotos();
+ return ERR_OK;
+#endif /* IP_REASSEMBLY */
+ }
+
+#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
+
+#if LWIP_IGMP
+ /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
+ if((iphdr_hlen > IP_HLEN && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
+#else
+ if (iphdr_hlen > IP_HLEN) {
+#endif /* LWIP_IGMP */
+ LWIP_DEBUGF(IP_DEBUG | 2, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
+ pbuf_free(p);
+ IP_STATS_INC(ip.opterr);
+ IP_STATS_INC(ip.drop);
+ /* unsupported protocol feature */
+ snmp_inc_ipinunknownprotos();
+ return ERR_OK;
+ }
+#endif /* IP_OPTIONS_ALLOWED == 0 */
+
+ /* send to upper layers */
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
+ ip_debug_print(p);
+ LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
+
+ current_netif = inp;
+ current_header = iphdr;
+
+#if LWIP_RAW
+ /* raw input did not eat the packet? */
+ if (raw_input(p, inp) == 0)
+#endif /* LWIP_RAW */
+ {
+
+ switch (IPH_PROTO(iphdr)) {
+#if LWIP_UDP
+ case IP_PROTO_UDP:
+#if LWIP_UDPLITE
+ case IP_PROTO_UDPLITE:
+#endif /* LWIP_UDPLITE */
+ snmp_inc_ipindelivers();
+ udp_input(p, inp);
+ break;
+#endif /* LWIP_UDP */
+#if LWIP_TCP
+ case IP_PROTO_TCP:
+ snmp_inc_ipindelivers();
+ tcp_input(p, inp);
+ break;
+#endif /* LWIP_TCP */
+#if LWIP_ICMP
+ case IP_PROTO_ICMP:
+ snmp_inc_ipindelivers();
+ icmp_input(p, inp);
+ break;
+#endif /* LWIP_ICMP */
+#if LWIP_IGMP
+ case IP_PROTO_IGMP:
+ igmp_input(p,inp,&(iphdr->dest));
+ break;
+#endif /* LWIP_IGMP */
+ default:
+#if LWIP_ICMP
+ /* send ICMP destination protocol unreachable unless is was a broadcast */
+ if (!ip_addr_isbroadcast(&(iphdr->dest), inp) &&
+ !ip_addr_ismulticast(&(iphdr->dest))) {
+ p->payload = iphdr;
+ icmp_dest_unreach(p, ICMP_DUR_PROTO);
+ }
+#endif /* LWIP_ICMP */
+ pbuf_free(p);
+
+ LWIP_DEBUGF(IP_DEBUG | 2, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
+
+ IP_STATS_INC(ip.proterr);
+ IP_STATS_INC(ip.drop);
+ snmp_inc_ipinunknownprotos();
+ }
+ }
+
+ current_netif = NULL;
+ current_header = NULL;
+
+ return ERR_OK;
+}
+
+/**
+ * Sends an IP packet on a network interface. This function constructs
+ * the IP header and calculates the IP header checksum. If the source
+ * IP address is NULL, the IP address of the outgoing network
+ * interface is filled in as source address.
+ * If the destination IP address is IP_HDRINCL, p is assumed to already
+ * include an IP header and p->payload points to it instead of the data.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param tos the TOS value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ * @param netif the netif on which to send this packet
+ * @return ERR_OK if the packet was sent OK
+ * ERR_BUF if p doesn't have enough space for IP/LINK headers
+ * returns errors returned by netif->output
+ *
+ * @note ip_id: RFC791 "some host may be able to simply use
+ * unique identifiers independent of destination"
+ */
+err_t
+ip_output_if(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t tos,
+ u8_t proto, struct netif *netif)
+{
+#if IP_OPTIONS_SEND
+ return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
+}
+
+/**
+ * Same as ip_output_if() but with the possibility to include IP options:
+ *
+ * @ param ip_options pointer to the IP options, copied into the IP header
+ * @ param optlen length of ip_options
+ */
+err_t ip_output_if_opt(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
+ u16_t optlen)
+{
+#endif /* IP_OPTIONS_SEND */
+ struct ip_hdr *iphdr;
+ static u16_t ip_id = 0;
+
+ snmp_inc_ipoutrequests();
+
+ /* Should the IP header be generated or is it already included in p? */
+ if (dest != IP_HDRINCL) {
+ u16_t ip_hlen = IP_HLEN;
+#if IP_OPTIONS_SEND
+ u16_t optlen_aligned = 0;
+ if (optlen != 0) {
+ /* round up to a multiple of 4 */
+ optlen_aligned = ((optlen + 3) & ~3);
+ ip_hlen += optlen_aligned;
+ /* First write in the IP options */
+ if (pbuf_header(p, optlen_aligned)) {
+ LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
+ IP_STATS_INC(ip.err);
+ snmp_inc_ipoutdiscards();
+ return ERR_BUF;
+ }
+ MEMCPY(p->payload, ip_options, optlen);
+ if (optlen < optlen_aligned) {
+ /* zero the remaining bytes */
+ memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
+ }
+ }
+#endif /* IP_OPTIONS_SEND */
+ /* generate IP header */
+ if (pbuf_header(p, IP_HLEN)) {
+ LWIP_DEBUGF(IP_DEBUG | 2, ("ip_output: not enough room for IP header in pbuf\n"));
+
+ IP_STATS_INC(ip.err);
+ snmp_inc_ipoutdiscards();
+ return ERR_BUF;
+ }
+
+ iphdr = p->payload;
+ LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
+ (p->len >= sizeof(struct ip_hdr)));
+
+ IPH_TTL_SET(iphdr, ttl);
+ IPH_PROTO_SET(iphdr, proto);
+
+ ip_addr_set(&(iphdr->dest), dest);
+
+ IPH_VHLTOS_SET(iphdr, 4, ip_hlen / 4, tos);
+ IPH_LEN_SET(iphdr, htons(p->tot_len));
+ IPH_OFFSET_SET(iphdr, 0);
+ IPH_ID_SET(iphdr, htons(ip_id));
+ ++ip_id;
+
+ if (ip_addr_isany(src)) {
+ ip_addr_set(&(iphdr->src), &(netif->ip_addr));
+ } else {
+ ip_addr_set(&(iphdr->src), src);
+ }
+
+ IPH_CHKSUM_SET(iphdr, 0);
+#if CHECKSUM_GEN_IP
+ IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
+#endif
+ } else {
+ /* IP header already included in p */
+ iphdr = p->payload;
+ dest = &(iphdr->dest);
+ }
+
+#if IP_FRAG
+ /* don't fragment if interface has mtu set to 0 [loopif] */
+ if (netif->mtu && (p->tot_len > netif->mtu))
+ return ip_frag(p,netif,dest);
+#endif
+
+ IP_STATS_INC(ip.xmit);
+
+ LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
+ ip_debug_print(p);
+
+#if (LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF)
+ if (ip_addr_cmp(dest, &netif->ip_addr)) {
+ /* Packet to self, enqueue it for loopback */
+ LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
+
+ return netif_loop_output(netif, p, dest);
+ } else
+#endif /* (LWIP_NETIF_LOOPBACK || LWIP_HAVE_LOOPIF) */
+ {
+ LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
+
+ return netif->output(netif, p, dest);
+ }
+}
+
+/**
+ * Simple interface to ip_output_if. It finds the outgoing network
+ * interface and calls upon ip_output_if to do the actual work.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param tos the TOS value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ *
+ * @return ERR_RTE if no route is found
+ * see ip_output_if() for more return values
+ */
+err_t
+ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t tos, u8_t proto)
+{
+ struct netif *netif;
+
+ if ((netif = ip_route(dest)) == NULL) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
+ IP_STATS_INC(ip.rterr);
+ return ERR_RTE;
+ }
+
+ return ip_output_if(p, src, dest, ttl, tos, proto, netif);
+}
+
+#if LWIP_NETIF_HWADDRHINT
+/** Like ip_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
+ * before calling ip_output_if.
+ *
+ * @param p the packet to send (p->payload points to the data, e.g. next
+ protocol header; if dest == IP_HDRINCL, p already includes an IP
+ header and p->payload points to that IP header)
+ * @param src the source IP address to send from (if src == IP_ADDR_ANY, the
+ * IP address of the netif used to send is used as source address)
+ * @param dest the destination IP address to send the packet to
+ * @param ttl the TTL value to be set in the IP header
+ * @param tos the TOS value to be set in the IP header
+ * @param proto the PROTOCOL to be set in the IP header
+ * @param addr_hint address hint pointer set to netif->addr_hint before
+ * calling ip_output_if()
+ *
+ * @return ERR_RTE if no route is found
+ * see ip_output_if() for more return values
+ */
+err_t
+ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+ u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
+{
+ struct netif *netif;
+ err_t err;
+
+ if ((netif = ip_route(dest)) == NULL) {
+ LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
+ IP_STATS_INC(ip.rterr);
+ return ERR_RTE;
+ }
+
+ netif->addr_hint = addr_hint;
+ err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
+ netif->addr_hint = NULL;
+
+ return err;
+}
+#endif /* LWIP_NETIF_HWADDRHINT*/
+
+#if IP_DEBUG
+/* Print an IP header by using LWIP_DEBUGF
+ * @param p an IP packet, p->payload pointing to the IP header
+ */
+void
+ip_debug_print(struct pbuf *p)
+{
+ struct ip_hdr *iphdr = p->payload;
+ u8_t *payload;
+
+ payload = (u8_t *)iphdr + IP_HLEN;
+
+ LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
+ IPH_V(iphdr),
+ IPH_HL(iphdr),
+ IPH_TOS(iphdr),
+ ntohs(IPH_LEN(iphdr))));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
+ ntohs(IPH_ID(iphdr)),
+ ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
+ ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
+ ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
+ ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
+ IPH_TTL(iphdr),
+ IPH_PROTO(iphdr),
+ ntohs(IPH_CHKSUM(iphdr))));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
+ ip4_addr1(&iphdr->src),
+ ip4_addr2(&iphdr->src),
+ ip4_addr3(&iphdr->src),
+ ip4_addr4(&iphdr->src)));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+ LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
+ ip4_addr1(&iphdr->dest),
+ ip4_addr2(&iphdr->dest),
+ ip4_addr3(&iphdr->dest),
+ ip4_addr4(&iphdr->dest)));
+ LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+}
+#endif /* IP_DEBUG */
diff --git a/core/lwip/src/core/ipv4/ip_addr.c b/core/lwip/src/core/ipv4/ip_addr.c
new file mode 100644
index 00000000..94bf4678
--- /dev/null
+++ b/core/lwip/src/core/ipv4/ip_addr.c
@@ -0,0 +1,84 @@
+/**
+ * @file
+ * This is the IPv4 address tools implementation.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip_addr.h"
+#include "lwip/inet.h"
+#include "lwip/netif.h"
+
+#define IP_ADDR_ANY_VALUE 0x00000000UL
+#define IP_ADDR_BROADCAST_VALUE 0xffffffffUL
+
+/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
+const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE };
+const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE };
+
+/**
+ * Determine if an address is a broadcast address on a network interface
+ *
+ * @param addr address to be checked
+ * @param netif the network interface against which the address is checked
+ * @return returns non-zero if the address is a broadcast address
+ */
+u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
+{
+ u32_t addr2test;
+
+ addr2test = addr->addr;
+ /* all ones (broadcast) or all zeroes (old skool broadcast) */
+ if ((~addr2test == IP_ADDR_ANY_VALUE) ||
+ (addr2test == IP_ADDR_ANY_VALUE))
+ return 1;
+ /* no broadcast support on this network interface? */
+ else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
+ /* the given address cannot be a broadcast address
+ * nor can we check against any broadcast addresses */
+ return 0;
+ /* address matches network interface address exactly? => no broadcast */
+ else if (addr2test == netif->ip_addr.addr)
+ return 0;
+ /* on the same (sub) network... */
+ else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
+ /* ...and host identifier bits are all ones? =>... */
+ && ((addr2test & ~netif->netmask.addr) ==
+ (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr)))
+ /* => network broadcast address */
+ return 1;
+ else
+ return 0;
+}
diff --git a/core/lwip/src/core/ipv4/ip_frag.c b/core/lwip/src/core/ipv4/ip_frag.c
new file mode 100644
index 00000000..1939d831
--- /dev/null
+++ b/core/lwip/src/core/ipv4/ip_frag.c
@@ -0,0 +1,792 @@
+/**
+ * @file
+ * This is the IPv4 packet segmentation and reassembly implementation.
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Jani Monoses <jani@iv.ro>
+ * Simon Goldschmidt
+ * original reassembly code by Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip_frag.h"
+#include "lwip/ip.h"
+#include "lwip/inet.h"
+#include "lwip/inet_chksum.h"
+#include "lwip/netif.h"
+#include "lwip/snmp.h"
+#include "lwip/stats.h"
+#include "lwip/icmp.h"
+
+#include <string.h>
+
+#if IP_REASSEMBLY
+/**
+ * The IP reassembly code currently has the following limitations:
+ * - IP header options are not supported
+ * - fragments must not overlap (e.g. due to different routes),
+ * currently, overlapping or duplicate fragments are thrown away
+ * if IP_REASS_CHECK_OVERLAP=1 (the default)!
+ *
+ * @todo: work with IP header options
+ */
+
+/** Setting this to 0, you can turn off checking the fragments for overlapping
+ * regions. The code gets a little smaller. Only use this if you know that
+ * overlapping won't occur on your network! */
+#ifndef IP_REASS_CHECK_OVERLAP
+#define IP_REASS_CHECK_OVERLAP 1
+#endif /* IP_REASS_CHECK_OVERLAP */
+
+/** Set to 0 to prevent freeing the oldest datagram when the reassembly buffer is
+ * full (IP_REASS_MAX_PBUFS pbufs are enqueued). The code gets a little smaller.
+ * Datagrams will be freed by timeout only. Especially useful when MEMP_NUM_REASSDATA
+ * is set to 1, so one datagram can be reassembled at a time, only. */
+#ifndef IP_REASS_FREE_OLDEST
+#define IP_REASS_FREE_OLDEST 1
+#endif /* IP_REASS_FREE_OLDEST */
+
+#define IP_REASS_FLAG_LASTFRAG 0x01
+
+/** This is a helper struct which holds the starting
+ * offset and the ending offset of this fragment to
+ * easily chain the fragments.
+ * It has to be packed since it has to fit inside the IP header.
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_reass_helper {
+ PACK_STRUCT_FIELD(struct pbuf *next_pbuf);
+ PACK_STRUCT_FIELD(u16_t start);
+ PACK_STRUCT_FIELD(u16_t end);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#define IP_ADDRESSES_AND_ID_MATCH(iphdrA, iphdrB) \
+ (ip_addr_cmp(&(iphdrA)->src, &(iphdrB)->src) && \
+ ip_addr_cmp(&(iphdrA)->dest, &(iphdrB)->dest) && \
+ IPH_ID(iphdrA) == IPH_ID(iphdrB)) ? 1 : 0
+
+/* global variables */
+static struct ip_reassdata *reassdatagrams;
+static u16_t ip_reass_pbufcount;
+
+/* function prototypes */
+static void ip_reass_dequeue_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev);
+static int ip_reass_free_complete_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev);
+
+/**
+ * Reassembly timer base function
+ * for both NO_SYS == 0 and 1 (!).
+ *
+ * Should be called every 1000 msec (defined by IP_TMR_INTERVAL).
+ */
+void
+ip_reass_tmr(void)
+{
+ struct ip_reassdata *r, *prev = NULL;
+
+ r = reassdatagrams;
+ while (r != NULL) {
+ /* Decrement the timer. Once it reaches 0,
+ * clean up the incomplete fragment assembly */
+ if (r->timer > 0) {
+ r->timer--;
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_tmr: timer dec %"U16_F"\n",(u16_t)r->timer));
+ prev = r;
+ r = r->next;
+ } else {
+ /* reassembly timed out */
+ struct ip_reassdata *tmp;
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass_tmr: timer timed out\n"));
+ tmp = r;
+ /* get the next pointer before freeing */
+ r = r->next;
+ /* free the helper struct and all enqueued pbufs */
+ ip_reass_free_complete_datagram(tmp, prev);
+ }
+ }
+}
+
+/**
+ * Free a datagram (struct ip_reassdata) and all its pbufs.
+ * Updates the total count of enqueued pbufs (ip_reass_pbufcount),
+ * SNMP counters and sends an ICMP time exceeded packet.
+ *
+ * @param ipr datagram to free
+ * @param prev the previous datagram in the linked list
+ * @return the number of pbufs freed
+ */
+static int
+ip_reass_free_complete_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev)
+{
+ int pbufs_freed = 0;
+ struct pbuf *p;
+ struct ip_reass_helper *iprh;
+
+ LWIP_ASSERT("prev != ipr", prev != ipr);
+ if (prev != NULL) {
+ LWIP_ASSERT("prev->next == ipr", prev->next == ipr);
+ }
+
+ snmp_inc_ipreasmfails();
+#if LWIP_ICMP
+ iprh = (struct ip_reass_helper *)ipr->p->payload;
+ if (iprh->start == 0) {
+ /* The first fragment was received, send ICMP time exceeded. */
+ /* First, de-queue the first pbuf from r->p. */
+ p = ipr->p;
+ ipr->p = iprh->next_pbuf;
+ /* Then, copy the original header into it. */
+ SMEMCPY(p->payload, &ipr->iphdr, IP_HLEN);
+ icmp_time_exceeded(p, ICMP_TE_FRAG);
+ pbufs_freed += pbuf_clen(p);
+ pbuf_free(p);
+ }
+#endif /* LWIP_ICMP */
+
+ /* First, free all received pbufs. The individual pbufs need to be released
+ separately as they have not yet been chained */
+ p = ipr->p;
+ while (p != NULL) {
+ struct pbuf *pcur;
+ iprh = (struct ip_reass_helper *)p->payload;
+ pcur = p;
+ /* get the next pointer before freeing */
+ p = iprh->next_pbuf;
+ pbufs_freed += pbuf_clen(pcur);
+ pbuf_free(pcur);
+ }
+ /* Then, unchain the struct ip_reassdata from the list and free it. */
+ ip_reass_dequeue_datagram(ipr, prev);
+ LWIP_ASSERT("ip_reass_pbufcount >= clen", ip_reass_pbufcount >= pbufs_freed);
+ ip_reass_pbufcount -= pbufs_freed;
+
+ return pbufs_freed;
+}
+
+#if IP_REASS_FREE_OLDEST
+/**
+ * Free the oldest datagram to make room for enqueueing new fragments.
+ * The datagram 'fraghdr' belongs to is not freed!
+ *
+ * @param fraghdr IP header of the current fragment
+ * @param pbufs_needed number of pbufs needed to enqueue
+ * (used for freeing other datagrams if not enough space)
+ * @return the number of pbufs freed
+ */
+static int
+ip_reass_remove_oldest_datagram(struct ip_hdr *fraghdr, int pbufs_needed)
+{
+ /* @todo Can't we simply remove the last datagram in the
+ * linked list behind reassdatagrams?
+ */
+ struct ip_reassdata *r, *oldest, *prev;
+ int pbufs_freed = 0, pbufs_freed_current;
+ int other_datagrams;
+
+ /* Free datagrams until being allowed to enqueue 'pbufs_needed' pbufs,
+ * but don't free the datagram that 'fraghdr' belongs to! */
+ do {
+ oldest = NULL;
+ prev = NULL;
+ other_datagrams = 0;
+ r = reassdatagrams;
+ while (r != NULL) {
+ if (!IP_ADDRESSES_AND_ID_MATCH(&r->iphdr, fraghdr)) {
+ /* Not the same datagram as fraghdr */
+ other_datagrams++;
+ if (oldest == NULL) {
+ oldest = r;
+ } else if (r->timer <= oldest->timer) {
+ /* older than the previous oldest */
+ oldest = r;
+ }
+ }
+ if (r->next != NULL) {
+ prev = r;
+ }
+ r = r->next;
+ }
+ if (oldest != NULL) {
+ pbufs_freed_current = ip_reass_free_complete_datagram(oldest, prev);
+ pbufs_freed += pbufs_freed_current;
+ }
+ } while ((pbufs_freed < pbufs_needed) && (other_datagrams > 1));
+ return pbufs_freed;
+}
+#endif /* IP_REASS_FREE_OLDEST */
+
+/**
+ * Enqueues a new fragment into the fragment queue
+ * @param fraghdr points to the new fragments IP hdr
+ * @param clen number of pbufs needed to enqueue (used for freeing other datagrams if not enough space)
+ * @return A pointer to the queue location into which the fragment was enqueued
+ */
+static struct ip_reassdata*
+ip_reass_enqueue_new_datagram(struct ip_hdr *fraghdr, int clen)
+{
+ struct ip_reassdata* ipr;
+ /* No matching previous fragment found, allocate a new reassdata struct */
+ ipr = memp_malloc(MEMP_REASSDATA);
+ if (ipr == NULL) {
+#if IP_REASS_FREE_OLDEST
+ if (ip_reass_remove_oldest_datagram(fraghdr, clen) >= clen) {
+ ipr = memp_malloc(MEMP_REASSDATA);
+ }
+ if (ipr == NULL)
+#endif /* IP_REASS_FREE_OLDEST */
+ {
+ IPFRAG_STATS_INC(ip_frag.memerr);
+ LWIP_DEBUGF(IP_REASS_DEBUG,("Failed to alloc reassdata struct\n"));
+ return NULL;
+ }
+ }
+ memset(ipr, 0, sizeof(struct ip_reassdata));
+ ipr->timer = IP_REASS_MAXAGE;
+
+ /* enqueue the new structure to the front of the list */
+ ipr->next = reassdatagrams;
+ reassdatagrams = ipr;
+ /* copy the ip header for later tests and input */
+ /* @todo: no ip options supported? */
+ SMEMCPY(&(ipr->iphdr), fraghdr, IP_HLEN);
+ return ipr;
+}
+
+/**
+ * Dequeues a datagram from the datagram queue. Doesn't deallocate the pbufs.
+ * @param ipr points to the queue entry to dequeue
+ */
+static void
+ip_reass_dequeue_datagram(struct ip_reassdata *ipr, struct ip_reassdata *prev)
+{
+
+ /* dequeue the reass struct */
+ if (reassdatagrams == ipr) {
+ /* it was the first in the list */
+ reassdatagrams = ipr->next;
+ } else {
+ /* it wasn't the first, so it must have a valid 'prev' */
+ LWIP_ASSERT("sanity check linked list", prev != NULL);
+ prev->next = ipr->next;
+ }
+
+ /* now we can free the ip_reass struct */
+ memp_free(MEMP_REASSDATA, ipr);
+}
+
+/**
+ * Chain a new pbuf into the pbuf list that composes the datagram. The pbuf list
+ * will grow over time as new pbufs are rx.
+ * Also checks that the datagram passes basic continuity checks (if the last
+ * fragment was received at least once).
+ * @param root_p points to the 'root' pbuf for the current datagram being assembled.
+ * @param new_p points to the pbuf for the current fragment
+ * @return 0 if invalid, >0 otherwise
+ */
+static int
+ip_reass_chain_frag_into_datagram_and_validate(struct ip_reassdata *ipr, struct pbuf *new_p)
+{
+ struct ip_reass_helper *iprh, *iprh_tmp, *iprh_prev=NULL;
+ struct pbuf *q;
+ u16_t offset,len;
+ struct ip_hdr *fraghdr;
+ int valid = 1;
+
+ /* Extract length and fragment offset from current fragment */
+ fraghdr = (struct ip_hdr*)new_p->payload;
+ len = ntohs(IPH_LEN(fraghdr)) - IPH_HL(fraghdr) * 4;
+ offset = (ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) * 8;
+
+ /* overwrite the fragment's ip header from the pbuf with our helper struct,
+ * and setup the embedded helper structure. */
+ /* make sure the struct ip_reass_helper fits into the IP header */
+ LWIP_ASSERT("sizeof(struct ip_reass_helper) <= IP_HLEN",
+ sizeof(struct ip_reass_helper) <= IP_HLEN);
+ iprh = (struct ip_reass_helper*)new_p->payload;
+ iprh->next_pbuf = NULL;
+ iprh->start = offset;
+ iprh->end = offset + len;
+
+ /* Iterate through until we either get to the end of the list (append),
+ * or we find on with a larger offset (insert). */
+ for (q = ipr->p; q != NULL;) {
+ iprh_tmp = (struct ip_reass_helper*)q->payload;
+ if (iprh->start < iprh_tmp->start) {
+ /* the new pbuf should be inserted before this */
+ iprh->next_pbuf = q;
+ if (iprh_prev != NULL) {
+ /* not the fragment with the lowest offset */
+#if IP_REASS_CHECK_OVERLAP
+ if ((iprh->start < iprh_prev->end) || (iprh->end > iprh_tmp->start)) {
+ /* fragment overlaps with previous or following, throw away */
+ goto freepbuf;
+ }
+#endif /* IP_REASS_CHECK_OVERLAP */
+ iprh_prev->next_pbuf = new_p;
+ } else {
+ /* fragment with the lowest offset */
+ ipr->p = new_p;
+ }
+ break;
+ } else if(iprh->start == iprh_tmp->start) {
+ /* received the same datagram twice: no need to keep the datagram */
+ goto freepbuf;
+#if IP_REASS_CHECK_OVERLAP
+ } else if(iprh->start < iprh_tmp->end) {
+ /* overlap: no need to keep the new datagram */
+ goto freepbuf;
+#endif /* IP_REASS_CHECK_OVERLAP */
+ } else {
+ /* Check if the fragments received so far have no wholes. */
+ if (iprh_prev != NULL) {
+ if (iprh_prev->end != iprh_tmp->start) {
+ /* There is a fragment missing between the current
+ * and the previous fragment */
+ valid = 0;
+ }
+ }
+ }
+ q = iprh_tmp->next_pbuf;
+ iprh_prev = iprh_tmp;
+ }
+
+ /* If q is NULL, then we made it to the end of the list. Determine what to do now */
+ if (q == NULL) {
+ if (iprh_prev != NULL) {
+ /* this is (for now), the fragment with the highest offset:
+ * chain it to the last fragment */
+#if IP_REASS_CHECK_OVERLAP
+ LWIP_ASSERT("check fragments don't overlap", iprh_prev->end <= iprh->start);
+#endif /* IP_REASS_CHECK_OVERLAP */
+ iprh_prev->next_pbuf = new_p;
+ if (iprh_prev->end != iprh->start) {
+ valid = 0;
+ }
+ } else {
+#if IP_REASS_CHECK_OVERLAP
+ LWIP_ASSERT("no previous fragment, this must be the first fragment!",
+ ipr->p == NULL);
+#endif /* IP_REASS_CHECK_OVERLAP */
+ /* this is the first fragment we ever received for this ip datagram */
+ ipr->p = new_p;
+ }
+ }
+
+ /* At this point, the validation part begins: */
+ /* If we already received the last fragment */
+ if ((ipr->flags & IP_REASS_FLAG_LASTFRAG) != 0) {
+ /* and had no wholes so far */
+ if (valid) {
+ /* then check if the rest of the fragments is here */
+ /* Check if the queue starts with the first datagram */
+ if (((struct ip_reass_helper*)ipr->p->payload)->start != 0) {
+ valid = 0;
+ } else {
+ /* and check that there are no wholes after this datagram */
+ iprh_prev = iprh;
+ q = iprh->next_pbuf;
+ while (q != NULL) {
+ iprh = (struct ip_reass_helper*)q->payload;
+ if (iprh_prev->end != iprh->start) {
+ valid = 0;
+ break;
+ }
+ iprh_prev = iprh;
+ q = iprh->next_pbuf;
+ }
+ /* if still valid, all fragments are received
+ * (because to the MF==0 already arrived */
+ if (valid) {
+ LWIP_ASSERT("sanity check", ipr->p != NULL);
+ LWIP_ASSERT("sanity check",
+ ((struct ip_reass_helper*)ipr->p->payload) != iprh);
+ LWIP_ASSERT("validate_datagram:next_pbuf!=NULL",
+ iprh->next_pbuf == NULL);
+ LWIP_ASSERT("validate_datagram:datagram end!=datagram len",
+ iprh->end == ipr->datagram_len);
+ }
+ }
+ }
+ /* If valid is 0 here, there are some fragments missing in the middle
+ * (since MF == 0 has already arrived). Such datagrams simply time out if
+ * no more fragments are received... */
+ return valid;
+ }
+ /* If we come here, not all fragments were received, yet! */
+ return 0; /* not yet valid! */
+#if IP_REASS_CHECK_OVERLAP
+freepbuf:
+ ip_reass_pbufcount -= pbuf_clen(new_p);
+ pbuf_free(new_p);
+ return 0;
+#endif /* IP_REASS_CHECK_OVERLAP */
+}
+
+/**
+ * Reassembles incoming IP fragments into an IP datagram.
+ *
+ * @param p points to a pbuf chain of the fragment
+ * @return NULL if reassembly is incomplete, ? otherwise
+ */
+struct pbuf *
+ip_reass(struct pbuf *p)
+{
+ struct pbuf *r;
+ struct ip_hdr *fraghdr;
+ struct ip_reassdata *ipr;
+ struct ip_reass_helper *iprh;
+ u16_t offset, len;
+ u8_t clen;
+ struct ip_reassdata *ipr_prev = NULL;
+
+ IPFRAG_STATS_INC(ip_frag.recv);
+ snmp_inc_ipreasmreqds();
+
+ fraghdr = (struct ip_hdr*)p->payload;
+
+ if ((IPH_HL(fraghdr) * 4) != IP_HLEN) {
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass: IP options currently not supported!\n"));
+ IPFRAG_STATS_INC(ip_frag.err);
+ goto nullreturn;
+ }
+
+ offset = (ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) * 8;
+ len = ntohs(IPH_LEN(fraghdr)) - IPH_HL(fraghdr) * 4;
+
+ /* Check if we are allowed to enqueue more datagrams. */
+ clen = pbuf_clen(p);
+ if ((ip_reass_pbufcount + clen) > IP_REASS_MAX_PBUFS) {
+#if IP_REASS_FREE_OLDEST
+ if (!ip_reass_remove_oldest_datagram(fraghdr, clen) ||
+ ((ip_reass_pbufcount + clen) > IP_REASS_MAX_PBUFS))
+#endif /* IP_REASS_FREE_OLDEST */
+ {
+ /* No datagram could be freed and still too many pbufs enqueued */
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass: Overflow condition: pbufct=%d, clen=%d, MAX=%d\n",
+ ip_reass_pbufcount, clen, IP_REASS_MAX_PBUFS));
+ IPFRAG_STATS_INC(ip_frag.memerr);
+ /* @todo: send ICMP time exceeded here? */
+ /* drop this pbuf */
+ goto nullreturn;
+ }
+ }
+
+ /* Look for the datagram the fragment belongs to in the current datagram queue,
+ * remembering the previous in the queue for later dequeueing. */
+ for (ipr = reassdatagrams; ipr != NULL; ipr = ipr->next) {
+ /* Check if the incoming fragment matches the one currently present
+ in the reassembly buffer. If so, we proceed with copying the
+ fragment into the buffer. */
+ if (IP_ADDRESSES_AND_ID_MATCH(&ipr->iphdr, fraghdr)) {
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_reass: matching previous fragment ID=%"X16_F"\n",
+ ntohs(IPH_ID(fraghdr))));
+ IPFRAG_STATS_INC(ip_frag.cachehit);
+ break;
+ }
+ ipr_prev = ipr;
+ }
+
+ if (ipr == NULL) {
+ /* Enqueue a new datagram into the datagram queue */
+ ipr = ip_reass_enqueue_new_datagram(fraghdr, clen);
+ /* Bail if unable to enqueue */
+ if(ipr == NULL) {
+ goto nullreturn;
+ }
+ } else {
+ if (((ntohs(IPH_OFFSET(fraghdr)) & IP_OFFMASK) == 0) &&
+ ((ntohs(IPH_OFFSET(&ipr->iphdr)) & IP_OFFMASK) != 0)) {
+ /* ipr->iphdr is not the header from the first fragment, but fraghdr is
+ * -> copy fraghdr into ipr->iphdr since we want to have the header
+ * of the first fragment (for ICMP time exceeded and later, for copying
+ * all options, if supported)*/
+ SMEMCPY(&ipr->iphdr, fraghdr, IP_HLEN);
+ }
+ }
+ /* Track the current number of pbufs current 'in-flight', in order to limit
+ the number of fragments that may be enqueued at any one time */
+ ip_reass_pbufcount += clen;
+
+ /* At this point, we have either created a new entry or pointing
+ * to an existing one */
+
+ /* check for 'no more fragments', and update queue entry*/
+ if ((ntohs(IPH_OFFSET(fraghdr)) & IP_MF) == 0) {
+ ipr->flags |= IP_REASS_FLAG_LASTFRAG;
+ ipr->datagram_len = offset + len;
+ LWIP_DEBUGF(IP_REASS_DEBUG,
+ ("ip_reass: last fragment seen, total len %"S16_F"\n",
+ ipr->datagram_len));
+ }
+ /* find the right place to insert this pbuf */
+ /* @todo: trim pbufs if fragments are overlapping */
+ if (ip_reass_chain_frag_into_datagram_and_validate(ipr, p)) {
+ /* the totally last fragment (flag more fragments = 0) was received at least
+ * once AND all fragments are received */
+ ipr->datagram_len += IP_HLEN;
+
+ /* save the second pbuf before copying the header over the pointer */
+ r = ((struct ip_reass_helper*)ipr->p->payload)->next_pbuf;
+
+ /* copy the original ip header back to the first pbuf */
+ fraghdr = (struct ip_hdr*)(ipr->p->payload);
+ SMEMCPY(fraghdr, &ipr->iphdr, IP_HLEN);
+ IPH_LEN_SET(fraghdr, htons(ipr->datagram_len));
+ IPH_OFFSET_SET(fraghdr, 0);
+ IPH_CHKSUM_SET(fraghdr, 0);
+ /* @todo: do we need to set calculate the correct checksum? */
+ IPH_CHKSUM_SET(fraghdr, inet_chksum(fraghdr, IP_HLEN));
+
+ p = ipr->p;
+
+ /* chain together the pbufs contained within the reass_data list. */
+ while(r != NULL) {
+ iprh = (struct ip_reass_helper*)r->payload;
+
+ /* hide the ip header for every succeding fragment */
+ pbuf_header(r, -IP_HLEN);
+ pbuf_cat(p, r);
+ r = iprh->next_pbuf;
+ }
+ /* release the sources allocate for the fragment queue entry */
+ ip_reass_dequeue_datagram(ipr, ipr_prev);
+
+ /* and adjust the number of pbufs currently queued for reassembly. */
+ ip_reass_pbufcount -= pbuf_clen(p);
+
+ /* Return the pbuf chain */
+ return p;
+ }
+ /* the datagram is not (yet?) reassembled completely */
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass_pbufcount: %d out\n", ip_reass_pbufcount));
+ return NULL;
+
+nullreturn:
+ LWIP_DEBUGF(IP_REASS_DEBUG,("ip_reass: nullreturn\n"));
+ IPFRAG_STATS_INC(ip_frag.drop);
+ pbuf_free(p);
+ return NULL;
+}
+#endif /* IP_REASSEMBLY */
+
+#if IP_FRAG
+#if IP_FRAG_USES_STATIC_BUF
+static u8_t buf[LWIP_MEM_ALIGN_SIZE(IP_FRAG_MAX_MTU + MEM_ALIGNMENT - 1)];
+#endif /* IP_FRAG_USES_STATIC_BUF */
+
+/**
+ * Fragment an IP datagram if too large for the netif.
+ *
+ * Chop the datagram in MTU sized chunks and send them in order
+ * by using a fixed size static memory buffer (PBUF_REF) or
+ * point PBUF_REFs into p (depending on IP_FRAG_USES_STATIC_BUF).
+ *
+ * @param p ip packet to send
+ * @param netif the netif on which to send
+ * @param dest destination ip address to which to send
+ *
+ * @return ERR_OK if sent successfully, err_t otherwise
+ */
+err_t
+ip_frag(struct pbuf *p, struct netif *netif, struct ip_addr *dest)
+{
+ struct pbuf *rambuf;
+#if IP_FRAG_USES_STATIC_BUF
+ struct pbuf *header;
+#else
+ struct pbuf *newpbuf;
+ struct ip_hdr *original_iphdr;
+#endif
+ struct ip_hdr *iphdr;
+ u16_t nfb;
+ u16_t left, cop;
+ u16_t mtu = netif->mtu;
+ u16_t ofo, omf;
+ u16_t last;
+ u16_t poff = IP_HLEN;
+ u16_t tmp;
+#if !IP_FRAG_USES_STATIC_BUF
+ u16_t newpbuflen = 0;
+ u16_t left_to_copy;
+#endif
+
+ /* Get a RAM based MTU sized pbuf */
+#if IP_FRAG_USES_STATIC_BUF
+ /* When using a static buffer, we use a PBUF_REF, which we will
+ * use to reference the packet (without link header).
+ * Layer and length is irrelevant.
+ */
+ rambuf = pbuf_alloc(PBUF_LINK, 0, PBUF_REF);
+ if (rambuf == NULL) {
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_frag: pbuf_alloc(PBUF_LINK, 0, PBUF_REF) failed\n"));
+ return ERR_MEM;
+ }
+ rambuf->tot_len = rambuf->len = mtu;
+ rambuf->payload = LWIP_MEM_ALIGN((void *)buf);
+
+ /* Copy the IP header in it */
+ iphdr = rambuf->payload;
+ SMEMCPY(iphdr, p->payload, IP_HLEN);
+#else /* IP_FRAG_USES_STATIC_BUF */
+ original_iphdr = p->payload;
+ iphdr = original_iphdr;
+#endif /* IP_FRAG_USES_STATIC_BUF */
+
+ /* Save original offset */
+ tmp = ntohs(IPH_OFFSET(iphdr));
+ ofo = tmp & IP_OFFMASK;
+ omf = tmp & IP_MF;
+
+ left = p->tot_len - IP_HLEN;
+
+ nfb = (mtu - IP_HLEN) / 8;
+
+ while (left) {
+ last = (left <= mtu - IP_HLEN);
+
+ /* Set new offset and MF flag */
+ tmp = omf | (IP_OFFMASK & (ofo));
+ if (!last)
+ tmp = tmp | IP_MF;
+
+ /* Fill this fragment */
+ cop = last ? left : nfb * 8;
+
+#if IP_FRAG_USES_STATIC_BUF
+ poff += pbuf_copy_partial(p, (u8_t*)iphdr + IP_HLEN, cop, poff);
+#else /* IP_FRAG_USES_STATIC_BUF */
+ /* When not using a static buffer, create a chain of pbufs.
+ * The first will be a PBUF_RAM holding the link and IP header.
+ * The rest will be PBUF_REFs mirroring the pbuf chain to be fragged,
+ * but limited to the size of an mtu.
+ */
+ rambuf = pbuf_alloc(PBUF_LINK, IP_HLEN, PBUF_RAM);
+ if (rambuf == NULL) {
+ return ERR_MEM;
+ }
+ LWIP_ASSERT("this needs a pbuf in one piece!",
+ (p->len >= (IP_HLEN)));
+ SMEMCPY(rambuf->payload, original_iphdr, IP_HLEN);
+ iphdr = rambuf->payload;
+
+ /* Can just adjust p directly for needed offset. */
+ p->payload = (u8_t *)p->payload + poff;
+ p->len -= poff;
+
+ left_to_copy = cop;
+ while (left_to_copy) {
+ newpbuflen = (left_to_copy < p->len) ? left_to_copy : p->len;
+ /* Is this pbuf already empty? */
+ if (!newpbuflen) {
+ p = p->next;
+ continue;
+ }
+ newpbuf = pbuf_alloc(PBUF_RAW, 0, PBUF_REF);
+ if (newpbuf == NULL) {
+ pbuf_free(rambuf);
+ return ERR_MEM;
+ }
+ /* Mirror this pbuf, although we might not need all of it. */
+ newpbuf->payload = p->payload;
+ newpbuf->len = newpbuf->tot_len = newpbuflen;
+ /* Add it to end of rambuf's chain, but using pbuf_cat, not pbuf_chain
+ * so that it is removed when pbuf_dechain is later called on rambuf.
+ */
+ pbuf_cat(rambuf, newpbuf);
+ left_to_copy -= newpbuflen;
+ if (left_to_copy)
+ p = p->next;
+ }
+ poff = newpbuflen;
+#endif /* IP_FRAG_USES_STATIC_BUF */
+
+ /* Correct header */
+ IPH_OFFSET_SET(iphdr, htons(tmp));
+ IPH_LEN_SET(iphdr, htons(cop + IP_HLEN));
+ IPH_CHKSUM_SET(iphdr, 0);
+ IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, IP_HLEN));
+
+#if IP_FRAG_USES_STATIC_BUF
+ if (last)
+ pbuf_realloc(rambuf, left + IP_HLEN);
+
+ /* This part is ugly: we alloc a RAM based pbuf for
+ * the link level header for each chunk and then
+ * free it.A PBUF_ROM style pbuf for which pbuf_header
+ * worked would make things simpler.
+ */
+ header = pbuf_alloc(PBUF_LINK, 0, PBUF_RAM);
+ if (header != NULL) {
+ pbuf_chain(header, rambuf);
+ netif->output(netif, header, dest);
+ IPFRAG_STATS_INC(ip_frag.xmit);
+ snmp_inc_ipfragcreates();
+ pbuf_free(header);
+ } else {
+ LWIP_DEBUGF(IP_REASS_DEBUG, ("ip_frag: pbuf_alloc() for header failed\n"));
+ pbuf_free(rambuf);
+ return ERR_MEM;
+ }
+#else /* IP_FRAG_USES_STATIC_BUF */
+ /* No need for separate header pbuf - we allowed room for it in rambuf
+ * when allocated.
+ */
+ netif->output(netif, rambuf, dest);
+ IPFRAG_STATS_INC(ip_frag.xmit);
+
+ /* Unfortunately we can't reuse rambuf - the hardware may still be
+ * using the buffer. Instead we free it (and the ensuing chain) and
+ * recreate it next time round the loop. If we're lucky the hardware
+ * will have already sent the packet, the free will really free, and
+ * there will be zero memory penalty.
+ */
+
+ pbuf_free(rambuf);
+#endif /* IP_FRAG_USES_STATIC_BUF */
+ left -= cop;
+ ofo += nfb;
+ }
+#if IP_FRAG_USES_STATIC_BUF
+ pbuf_free(rambuf);
+#endif /* IP_FRAG_USES_STATIC_BUF */
+ snmp_inc_ipfragoks();
+ return ERR_OK;
+}
+#endif /* IP_FRAG */
diff --git a/core/lwip/src/core/mem.c b/core/lwip/src/core/mem.c
new file mode 100644
index 00000000..b5f13ab3
--- /dev/null
+++ b/core/lwip/src/core/mem.c
@@ -0,0 +1,633 @@
+/**
+ * @file
+ * Dynamic memory manager
+ *
+ * This is a lightweight replacement for the standard C library malloc().
+ *
+ * If you want to use the standard C library malloc() instead, define
+ * MEM_LIBC_MALLOC to 1 in your lwipopts.h
+ *
+ * To let mem_malloc() use pools (prevents fragmentation and is much faster than
+ * a heap but might waste some memory), define MEM_USE_POOLS to 1, define
+ * MEM_USE_CUSTOM_POOLS to 1 and create a file "lwippools.h" that includes a list
+ * of pools like this (more pools can be added between _START and _END):
+ *
+ * Define three pools with sizes 256, 512, and 1512 bytes
+ * LWIP_MALLOC_MEMPOOL_START
+ * LWIP_MALLOC_MEMPOOL(20, 256)
+ * LWIP_MALLOC_MEMPOOL(10, 512)
+ * LWIP_MALLOC_MEMPOOL(5, 1512)
+ * LWIP_MALLOC_MEMPOOL_END
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ * Simon Goldschmidt
+ *
+ */
+
+#include "lwip/opt.h"
+
+#if !MEM_LIBC_MALLOC /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/sys.h"
+#include "lwip/stats.h"
+
+#include <string.h>
+
+#if MEM_USE_POOLS
+/* lwIP head implemented with different sized pools */
+
+/**
+ * Allocate memory: determine the smallest pool that is big enough
+ * to contain an element of 'size' and get an element from that pool.
+ *
+ * @param size the size in bytes of the memory needed
+ * @return a pointer to the allocated memory or NULL if the pool is empty
+ */
+void *
+mem_malloc(mem_size_t size)
+{
+ struct memp_malloc_helper *element;
+ memp_t poolnr;
+ mem_size_t required_size = size + sizeof(struct memp_malloc_helper);
+
+ for (poolnr = MEMP_POOL_FIRST; poolnr <= MEMP_POOL_LAST; poolnr++) {
+#if MEM_USE_POOLS_TRY_BIGGER_POOL
+again:
+#endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */
+ /* is this pool big enough to hold an element of the required size
+ plus a struct memp_malloc_helper that saves the pool this element came from? */
+ if (required_size <= memp_sizes[poolnr]) {
+ break;
+ }
+ }
+ if (poolnr > MEMP_POOL_LAST) {
+ LWIP_ASSERT("mem_malloc(): no pool is that big!", 0);
+ return NULL;
+ }
+ element = (struct memp_malloc_helper*)memp_malloc(poolnr);
+ if (element == NULL) {
+ /* No need to DEBUGF or ASSERT: This error is already
+ taken care of in memp.c */
+#if MEM_USE_POOLS_TRY_BIGGER_POOL
+ /** Try a bigger pool if this one is empty! */
+ if (poolnr < MEMP_POOL_LAST) {
+ poolnr++;
+ goto again;
+ }
+#endif /* MEM_USE_POOLS_TRY_BIGGER_POOL */
+ return NULL;
+ }
+
+ /* save the pool number this element came from */
+ element->poolnr = poolnr;
+ /* and return a pointer to the memory directly after the struct memp_malloc_helper */
+ element++;
+
+ return element;
+}
+
+/**
+ * Free memory previously allocated by mem_malloc. Loads the pool number
+ * and calls memp_free with that pool number to put the element back into
+ * its pool
+ *
+ * @param rmem the memory element to free
+ */
+void
+mem_free(void *rmem)
+{
+ struct memp_malloc_helper *hmem = (struct memp_malloc_helper*)rmem;
+
+ LWIP_ASSERT("rmem != NULL", (rmem != NULL));
+ LWIP_ASSERT("rmem == MEM_ALIGN(rmem)", (rmem == LWIP_MEM_ALIGN(rmem)));
+
+ /* get the original struct memp_malloc_helper */
+ hmem--;
+
+ LWIP_ASSERT("hmem != NULL", (hmem != NULL));
+ LWIP_ASSERT("hmem == MEM_ALIGN(hmem)", (hmem == LWIP_MEM_ALIGN(hmem)));
+ LWIP_ASSERT("hmem->poolnr < MEMP_MAX", (hmem->poolnr < MEMP_MAX));
+
+ /* and put it in the pool we saved earlier */
+ memp_free(hmem->poolnr, hmem);
+}
+
+#else /* MEM_USE_POOLS */
+/* lwIP replacement for your libc malloc() */
+
+/**
+ * The heap is made up as a list of structs of this type.
+ * This does not have to be aligned since for getting its size,
+ * we only use the macro SIZEOF_STRUCT_MEM, which automatically alignes.
+ */
+struct mem {
+ /** index (-> ram[next]) of the next struct */
+ mem_size_t next;
+ /** index (-> ram[next]) of the next struct */
+ mem_size_t prev;
+ /** 1: this area is used; 0: this area is unused */
+ u8_t used;
+};
+
+/** All allocated blocks will be MIN_SIZE bytes big, at least!
+ * MIN_SIZE can be overridden to suit your needs. Smaller values save space,
+ * larger values could prevent too small blocks to fragment the RAM too much. */
+#ifndef MIN_SIZE
+#define MIN_SIZE 12
+#endif /* MIN_SIZE */
+/* some alignment macros: we define them here for better source code layout */
+#define MIN_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MIN_SIZE)
+#define SIZEOF_STRUCT_MEM LWIP_MEM_ALIGN_SIZE(sizeof(struct mem))
+#define MEM_SIZE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEM_SIZE)
+
+/** the heap. we need one struct mem at the end and some room for alignment */
+static u8_t ram_heap[MEM_SIZE_ALIGNED + (2*SIZEOF_STRUCT_MEM) + MEM_ALIGNMENT];
+/** pointer to the heap (ram_heap): for alignment, ram is now a pointer instead of an array */
+static u8_t *ram;
+/** the last entry, always unused! */
+static struct mem *ram_end;
+/** pointer to the lowest free block, this is used for faster search */
+static struct mem *lfree;
+
+/** concurrent access protection */
+static sys_sem_t mem_sem;
+
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+
+static volatile u8_t mem_free_count;
+
+/* Allow mem_free from other (e.g. interrupt) context */
+#define LWIP_MEM_FREE_DECL_PROTECT() SYS_ARCH_DECL_PROTECT(lev_free)
+#define LWIP_MEM_FREE_PROTECT() SYS_ARCH_PROTECT(lev_free)
+#define LWIP_MEM_FREE_UNPROTECT() SYS_ARCH_UNPROTECT(lev_free)
+#define LWIP_MEM_ALLOC_DECL_PROTECT() SYS_ARCH_DECL_PROTECT(lev_alloc)
+#define LWIP_MEM_ALLOC_PROTECT() SYS_ARCH_PROTECT(lev_alloc)
+#define LWIP_MEM_ALLOC_UNPROTECT() SYS_ARCH_UNPROTECT(lev_alloc)
+
+#else /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+/* Protect the heap only by using a semaphore */
+#define LWIP_MEM_FREE_DECL_PROTECT()
+#define LWIP_MEM_FREE_PROTECT() sys_arch_sem_wait(mem_sem, 0)
+#define LWIP_MEM_FREE_UNPROTECT() sys_sem_signal(mem_sem)
+/* mem_malloc is protected using semaphore AND LWIP_MEM_ALLOC_PROTECT */
+#define LWIP_MEM_ALLOC_DECL_PROTECT()
+#define LWIP_MEM_ALLOC_PROTECT()
+#define LWIP_MEM_ALLOC_UNPROTECT()
+
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+
+/**
+ * "Plug holes" by combining adjacent empty struct mems.
+ * After this function is through, there should not exist
+ * one empty struct mem pointing to another empty struct mem.
+ *
+ * @param mem this points to a struct mem which just has been freed
+ * @internal this function is only called by mem_free() and mem_realloc()
+ *
+ * This assumes access to the heap is protected by the calling function
+ * already.
+ */
+static void
+plug_holes(struct mem *mem)
+{
+ struct mem *nmem;
+ struct mem *pmem;
+
+ LWIP_ASSERT("plug_holes: mem >= ram", (u8_t *)mem >= ram);
+ LWIP_ASSERT("plug_holes: mem < ram_end", (u8_t *)mem < (u8_t *)ram_end);
+ LWIP_ASSERT("plug_holes: mem->used == 0", mem->used == 0);
+
+ /* plug hole forward */
+ LWIP_ASSERT("plug_holes: mem->next <= MEM_SIZE_ALIGNED", mem->next <= MEM_SIZE_ALIGNED);
+
+ nmem = (struct mem *)&ram[mem->next];
+ if (mem != nmem && nmem->used == 0 && (u8_t *)nmem != (u8_t *)ram_end) {
+ /* if mem->next is unused and not end of ram, combine mem and mem->next */
+ if (lfree == nmem) {
+ lfree = mem;
+ }
+ mem->next = nmem->next;
+ ((struct mem *)&ram[nmem->next])->prev = (u8_t *)mem - ram;
+ }
+
+ /* plug hole backward */
+ pmem = (struct mem *)&ram[mem->prev];
+ if (pmem != mem && pmem->used == 0) {
+ /* if mem->prev is unused, combine mem and mem->prev */
+ if (lfree == mem) {
+ lfree = pmem;
+ }
+ pmem->next = mem->next;
+ ((struct mem *)&ram[mem->next])->prev = (u8_t *)pmem - ram;
+ }
+}
+
+/**
+ * Zero the heap and initialize start, end and lowest-free
+ */
+void
+mem_init(void)
+{
+ struct mem *mem;
+
+ LWIP_ASSERT("Sanity check alignment",
+ (SIZEOF_STRUCT_MEM & (MEM_ALIGNMENT-1)) == 0);
+
+ /* align the heap */
+ ram = LWIP_MEM_ALIGN(ram_heap);
+ /* initialize the start of the heap */
+ mem = (struct mem *)ram;
+ mem->next = MEM_SIZE_ALIGNED;
+ mem->prev = 0;
+ mem->used = 0;
+ /* initialize the end of the heap */
+ ram_end = (struct mem *)&ram[MEM_SIZE_ALIGNED];
+ ram_end->used = 1;
+ ram_end->next = MEM_SIZE_ALIGNED;
+ ram_end->prev = MEM_SIZE_ALIGNED;
+
+ mem_sem = sys_sem_new(1);
+
+ /* initialize the lowest-free pointer to the start of the heap */
+ lfree = (struct mem *)ram;
+
+ MEM_STATS_AVAIL(avail, MEM_SIZE_ALIGNED);
+}
+
+/**
+ * Put a struct mem back on the heap
+ *
+ * @param rmem is the data portion of a struct mem as returned by a previous
+ * call to mem_malloc()
+ */
+void
+mem_free(void *rmem)
+{
+ struct mem *mem;
+ LWIP_MEM_FREE_DECL_PROTECT();
+
+ if (rmem == NULL) {
+ LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_TRACE | 2, ("mem_free(p == NULL) was called.\n"));
+ return;
+ }
+ LWIP_ASSERT("mem_free: sanity check alignment", (((mem_ptr_t)rmem) & (MEM_ALIGNMENT-1)) == 0);
+
+ LWIP_ASSERT("mem_free: legal memory", (u8_t *)rmem >= (u8_t *)ram &&
+ (u8_t *)rmem < (u8_t *)ram_end);
+
+ if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
+ SYS_ARCH_DECL_PROTECT(lev);
+ LWIP_DEBUGF(MEM_DEBUG | 3, ("mem_free: illegal memory\n"));
+ /* protect mem stats from concurrent access */
+ SYS_ARCH_PROTECT(lev);
+ MEM_STATS_INC(illegal);
+ SYS_ARCH_UNPROTECT(lev);
+ return;
+ }
+ /* protect the heap from concurrent access */
+ LWIP_MEM_FREE_PROTECT();
+ /* Get the corresponding struct mem ... */
+ mem = (struct mem *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
+ /* ... which has to be in a used state ... */
+ LWIP_ASSERT("mem_free: mem->used", mem->used);
+ /* ... and is now unused. */
+ mem->used = 0;
+
+ if (mem < lfree) {
+ /* the newly freed struct is now the lowest */
+ lfree = mem;
+ }
+
+ MEM_STATS_DEC_USED(used, mem->next - ((u8_t *)mem - ram));
+
+ /* finally, see if prev or next are free also */
+ plug_holes(mem);
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ mem_free_count = 1;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_MEM_FREE_UNPROTECT();
+}
+
+/**
+ * In contrast to its name, mem_realloc can only shrink memory, not expand it.
+ * Since the only use (for now) is in pbuf_realloc (which also can only shrink),
+ * this shouldn't be a problem!
+ *
+ * @param rmem pointer to memory allocated by mem_malloc the is to be shrinked
+ * @param newsize required size after shrinking (needs to be smaller than or
+ * equal to the previous size)
+ * @return for compatibility reasons: is always == rmem, at the moment
+ * or NULL if newsize is > old size, in which case rmem is NOT touched
+ * or freed!
+ */
+void *
+mem_realloc(void *rmem, mem_size_t newsize)
+{
+ mem_size_t size;
+ mem_size_t ptr, ptr2;
+ struct mem *mem, *mem2;
+ /* use the FREE_PROTECT here: it protects with sem OR SYS_ARCH_PROTECT */
+ LWIP_MEM_FREE_DECL_PROTECT();
+
+ /* Expand the size of the allocated memory region so that we can
+ adjust for alignment. */
+ newsize = LWIP_MEM_ALIGN_SIZE(newsize);
+
+ if(newsize < MIN_SIZE_ALIGNED) {
+ /* every data block must be at least MIN_SIZE_ALIGNED long */
+ newsize = MIN_SIZE_ALIGNED;
+ }
+
+ if (newsize > MEM_SIZE_ALIGNED) {
+ return NULL;
+ }
+
+ LWIP_ASSERT("mem_realloc: legal memory", (u8_t *)rmem >= (u8_t *)ram &&
+ (u8_t *)rmem < (u8_t *)ram_end);
+
+ if ((u8_t *)rmem < (u8_t *)ram || (u8_t *)rmem >= (u8_t *)ram_end) {
+ SYS_ARCH_DECL_PROTECT(lev);
+ LWIP_DEBUGF(MEM_DEBUG | 3, ("mem_realloc: illegal memory\n"));
+ /* protect mem stats from concurrent access */
+ SYS_ARCH_PROTECT(lev);
+ MEM_STATS_INC(illegal);
+ SYS_ARCH_UNPROTECT(lev);
+ return rmem;
+ }
+ /* Get the corresponding struct mem ... */
+ mem = (struct mem *)((u8_t *)rmem - SIZEOF_STRUCT_MEM);
+ /* ... and its offset pointer */
+ ptr = (u8_t *)mem - ram;
+
+ size = mem->next - ptr - SIZEOF_STRUCT_MEM;
+ LWIP_ASSERT("mem_realloc can only shrink memory", newsize <= size);
+ if (newsize > size) {
+ /* not supported */
+ return NULL;
+ }
+ if (newsize == size) {
+ /* No change in size, simply return */
+ return rmem;
+ }
+
+ /* protect the heap from concurrent access */
+ LWIP_MEM_FREE_PROTECT();
+
+ MEM_STATS_DEC_USED(used, (size - newsize));
+
+ mem2 = (struct mem *)&ram[mem->next];
+ if(mem2->used == 0) {
+ /* The next struct is unused, we can simply move it at little */
+ mem_size_t next;
+ /* remember the old next pointer */
+ next = mem2->next;
+ /* create new struct mem which is moved directly after the shrinked mem */
+ ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;
+ if (lfree == mem2) {
+ lfree = (struct mem *)&ram[ptr2];
+ }
+ mem2 = (struct mem *)&ram[ptr2];
+ mem2->used = 0;
+ /* restore the next pointer */
+ mem2->next = next;
+ /* link it back to mem */
+ mem2->prev = ptr;
+ /* link mem to it */
+ mem->next = ptr2;
+ /* last thing to restore linked list: as we have moved mem2,
+ * let 'mem2->next->prev' point to mem2 again. but only if mem2->next is not
+ * the end of the heap */
+ if (mem2->next != MEM_SIZE_ALIGNED) {
+ ((struct mem *)&ram[mem2->next])->prev = ptr2;
+ }
+ /* no need to plug holes, we've already done that */
+ } else if (newsize + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED <= size) {
+ /* Next struct is used but there's room for another struct mem with
+ * at least MIN_SIZE_ALIGNED of data.
+ * Old size ('size') must be big enough to contain at least 'newsize' plus a struct mem
+ * ('SIZEOF_STRUCT_MEM') with some data ('MIN_SIZE_ALIGNED').
+ * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty
+ * region that couldn't hold data, but when mem->next gets freed,
+ * the 2 regions would be combined, resulting in more free memory */
+ ptr2 = ptr + SIZEOF_STRUCT_MEM + newsize;
+ mem2 = (struct mem *)&ram[ptr2];
+ if (mem2 < lfree) {
+ lfree = mem2;
+ }
+ mem2->used = 0;
+ mem2->next = mem->next;
+ mem2->prev = ptr;
+ mem->next = ptr2;
+ if (mem2->next != MEM_SIZE_ALIGNED) {
+ ((struct mem *)&ram[mem2->next])->prev = ptr2;
+ }
+ /* the original mem->next is used, so no need to plug holes! */
+ }
+ /* else {
+ next struct mem is used but size between mem and mem2 is not big enough
+ to create another struct mem
+ -> don't do anyhting.
+ -> the remaining space stays unused since it is too small
+ } */
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ mem_free_count = 1;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_MEM_FREE_UNPROTECT();
+ return rmem;
+}
+
+/**
+ * Adam's mem_malloc() plus solution for bug #17922
+ * Allocate a block of memory with a minimum of 'size' bytes.
+ *
+ * @param size is the minimum size of the requested block in bytes.
+ * @return pointer to allocated memory or NULL if no free memory was found.
+ *
+ * Note that the returned value will always be aligned (as defined by MEM_ALIGNMENT).
+ */
+void *
+mem_malloc(mem_size_t size)
+{
+ mem_size_t ptr, ptr2;
+ struct mem *mem, *mem2;
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ u8_t local_mem_free_count = 0;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_MEM_ALLOC_DECL_PROTECT();
+
+ if (size == 0) {
+ return NULL;
+ }
+
+ /* Expand the size of the allocated memory region so that we can
+ adjust for alignment. */
+ size = LWIP_MEM_ALIGN_SIZE(size);
+
+ if(size < MIN_SIZE_ALIGNED) {
+ /* every data block must be at least MIN_SIZE_ALIGNED long */
+ size = MIN_SIZE_ALIGNED;
+ }
+
+ if (size > MEM_SIZE_ALIGNED) {
+ return NULL;
+ }
+
+ /* protect the heap from concurrent access */
+ sys_arch_sem_wait(mem_sem, 0);
+ LWIP_MEM_ALLOC_PROTECT();
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ /* run as long as a mem_free disturbed mem_malloc */
+ do {
+ local_mem_free_count = 0;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+ /* Scan through the heap searching for a free block that is big enough,
+ * beginning with the lowest free block.
+ */
+ for (ptr = (u8_t *)lfree - ram; ptr < MEM_SIZE_ALIGNED - size;
+ ptr = ((struct mem *)&ram[ptr])->next) {
+ mem = (struct mem *)&ram[ptr];
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ mem_free_count = 0;
+ LWIP_MEM_ALLOC_UNPROTECT();
+ /* allow mem_free to run */
+ LWIP_MEM_ALLOC_PROTECT();
+ if (mem_free_count != 0) {
+ local_mem_free_count = mem_free_count;
+ }
+ mem_free_count = 0;
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+
+ if ((!mem->used) &&
+ (mem->next - (ptr + SIZEOF_STRUCT_MEM)) >= size) {
+ /* mem is not used and at least perfect fit is possible:
+ * mem->next - (ptr + SIZEOF_STRUCT_MEM) gives us the 'user data size' of mem */
+
+ if (mem->next - (ptr + SIZEOF_STRUCT_MEM) >= (size + SIZEOF_STRUCT_MEM + MIN_SIZE_ALIGNED)) {
+ /* (in addition to the above, we test if another struct mem (SIZEOF_STRUCT_MEM) containing
+ * at least MIN_SIZE_ALIGNED of data also fits in the 'user data space' of 'mem')
+ * -> split large block, create empty remainder,
+ * remainder must be large enough to contain MIN_SIZE_ALIGNED data: if
+ * mem->next - (ptr + (2*SIZEOF_STRUCT_MEM)) == size,
+ * struct mem would fit in but no data between mem2 and mem2->next
+ * @todo we could leave out MIN_SIZE_ALIGNED. We would create an empty
+ * region that couldn't hold data, but when mem->next gets freed,
+ * the 2 regions would be combined, resulting in more free memory
+ */
+ ptr2 = ptr + SIZEOF_STRUCT_MEM + size;
+ /* create mem2 struct */
+ mem2 = (struct mem *)&ram[ptr2];
+ mem2->used = 0;
+ mem2->next = mem->next;
+ mem2->prev = ptr;
+ /* and insert it between mem and mem->next */
+ mem->next = ptr2;
+ mem->used = 1;
+
+ if (mem2->next != MEM_SIZE_ALIGNED) {
+ ((struct mem *)&ram[mem2->next])->prev = ptr2;
+ }
+ MEM_STATS_INC_USED(used, (size + SIZEOF_STRUCT_MEM));
+ } else {
+ /* (a mem2 struct does no fit into the user data space of mem and mem->next will always
+ * be used at this point: if not we have 2 unused structs in a row, plug_holes should have
+ * take care of this).
+ * -> near fit or excact fit: do not split, no mem2 creation
+ * also can't move mem->next directly behind mem, since mem->next
+ * will always be used at this point!
+ */
+ mem->used = 1;
+ MEM_STATS_INC_USED(used, mem->next - ((u8_t *)mem - ram));
+ }
+
+ if (mem == lfree) {
+ /* Find next free block after mem and update lowest free pointer */
+ while (lfree->used && lfree != ram_end) {
+ LWIP_MEM_ALLOC_UNPROTECT();
+ /* prevent high interrupt latency... */
+ LWIP_MEM_ALLOC_PROTECT();
+ lfree = (struct mem *)&ram[lfree->next];
+ }
+ LWIP_ASSERT("mem_malloc: !lfree->used", ((lfree == ram_end) || (!lfree->used)));
+ }
+ LWIP_MEM_ALLOC_UNPROTECT();
+ sys_sem_signal(mem_sem);
+ LWIP_ASSERT("mem_malloc: allocated memory not above ram_end.",
+ (mem_ptr_t)mem + SIZEOF_STRUCT_MEM + size <= (mem_ptr_t)ram_end);
+ LWIP_ASSERT("mem_malloc: allocated memory properly aligned.",
+ ((mem_ptr_t)mem + SIZEOF_STRUCT_MEM) % MEM_ALIGNMENT == 0);
+ LWIP_ASSERT("mem_malloc: sanity check alignment",
+ (((mem_ptr_t)mem) & (MEM_ALIGNMENT-1)) == 0);
+
+ return (u8_t *)mem + SIZEOF_STRUCT_MEM;
+ }
+ }
+#if LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
+ /* if we got interrupted by a mem_free, try again */
+ } while(local_mem_free_count != 0);
+#endif /* LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT */
+ LWIP_DEBUGF(MEM_DEBUG | 2, ("mem_malloc: could not allocate %"S16_F" bytes\n", (s16_t)size));
+ MEM_STATS_INC(err);
+ LWIP_MEM_ALLOC_UNPROTECT();
+ sys_sem_signal(mem_sem);
+ return NULL;
+}
+
+#endif /* MEM_USE_POOLS */
+/**
+ * Contiguously allocates enough space for count objects that are size bytes
+ * of memory each and returns a pointer to the allocated memory.
+ *
+ * The allocated memory is filled with bytes of value zero.
+ *
+ * @param count number of objects to allocate
+ * @param size size of the objects to allocate
+ * @return pointer to allocated memory / NULL pointer if there is an error
+ */
+void *mem_calloc(mem_size_t count, mem_size_t size)
+{
+ void *p;
+
+ /* allocate 'count' objects of size 'size' */
+ p = mem_malloc(count * size);
+ if (p) {
+ /* zero the memory */
+ memset(p, 0, count * size);
+ }
+ return p;
+}
+
+#endif /* !MEM_LIBC_MALLOC */
diff --git a/core/lwip/src/core/memp.c b/core/lwip/src/core/memp.c
new file mode 100644
index 00000000..dfc32213
--- /dev/null
+++ b/core/lwip/src/core/memp.c
@@ -0,0 +1,386 @@
+/**
+ * @file
+ * Dynamic pool memory manager
+ *
+ * lwIP has dedicated pools for many structures (netconn, protocol control blocks,
+ * packet buffers, ...). All these pools are managed here.
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/memp.h"
+#include "lwip/pbuf.h"
+#include "lwip/udp.h"
+#include "lwip/raw.h"
+#include "lwip/tcp.h"
+#include "lwip/igmp.h"
+#include "lwip/api.h"
+#include "lwip/api_msg.h"
+#include "lwip/tcpip.h"
+#include "lwip/sys.h"
+#include "lwip/stats.h"
+#include "netif/etharp.h"
+#include "lwip/ip_frag.h"
+
+#include <string.h>
+
+#if !MEMP_MEM_MALLOC /* don't build if not configured for use in lwipopts.h */
+
+struct memp {
+ struct memp *next;
+#if MEMP_OVERFLOW_CHECK
+ const char *file;
+ int line;
+#endif /* MEMP_OVERFLOW_CHECK */
+};
+
+#if MEMP_OVERFLOW_CHECK
+/* if MEMP_OVERFLOW_CHECK is turned on, we reserve some bytes at the beginning
+ * and at the end of each element, initialize them as 0xcd and check
+ * them later. */
+/* If MEMP_OVERFLOW_CHECK is >= 2, on every call to memp_malloc or memp_free,
+ * every single element in each pool is checked!
+ * This is VERY SLOW but also very helpful. */
+/* MEMP_SANITY_REGION_BEFORE and MEMP_SANITY_REGION_AFTER can be overridden in
+ * lwipopts.h to change the amount reserved for checking. */
+#ifndef MEMP_SANITY_REGION_BEFORE
+#define MEMP_SANITY_REGION_BEFORE 16
+#endif /* MEMP_SANITY_REGION_BEFORE*/
+#if MEMP_SANITY_REGION_BEFORE > 0
+#define MEMP_SANITY_REGION_BEFORE_ALIGNED LWIP_MEM_ALIGN_SIZE(MEMP_SANITY_REGION_BEFORE)
+#else
+#define MEMP_SANITY_REGION_BEFORE_ALIGNED 0
+#endif /* MEMP_SANITY_REGION_BEFORE*/
+#ifndef MEMP_SANITY_REGION_AFTER
+#define MEMP_SANITY_REGION_AFTER 16
+#endif /* MEMP_SANITY_REGION_AFTER*/
+#if MEMP_SANITY_REGION_AFTER > 0
+#define MEMP_SANITY_REGION_AFTER_ALIGNED LWIP_MEM_ALIGN_SIZE(MEMP_SANITY_REGION_AFTER)
+#else
+#define MEMP_SANITY_REGION_AFTER_ALIGNED 0
+#endif /* MEMP_SANITY_REGION_AFTER*/
+
+/* MEMP_SIZE: save space for struct memp and for sanity check */
+#define MEMP_SIZE (LWIP_MEM_ALIGN_SIZE(sizeof(struct memp)) + MEMP_SANITY_REGION_BEFORE_ALIGNED)
+#define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x) + MEMP_SANITY_REGION_AFTER_ALIGNED)
+
+#else /* MEMP_OVERFLOW_CHECK */
+
+/* No sanity checks
+ * We don't need to preserve the struct memp while not allocated, so we
+ * can save a little space and set MEMP_SIZE to 0.
+ */
+#define MEMP_SIZE 0
+#define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x))
+
+#endif /* MEMP_OVERFLOW_CHECK */
+
+/** This array holds the first free element of each pool.
+ * Elements form a linked list. */
+static struct memp *memp_tab[MEMP_MAX];
+
+#else /* MEMP_MEM_MALLOC */
+
+#define MEMP_ALIGN_SIZE(x) (LWIP_MEM_ALIGN_SIZE(x))
+
+#endif /* MEMP_MEM_MALLOC */
+
+/** This array holds the element sizes of each pool. */
+#if !MEM_USE_POOLS && !MEMP_MEM_MALLOC
+static
+#endif
+const u16_t memp_sizes[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) LWIP_MEM_ALIGN_SIZE(size),
+#include "lwip/memp_std.h"
+};
+
+#if !MEMP_MEM_MALLOC /* don't build if not configured for use in lwipopts.h */
+
+/** This array holds the number of elements in each pool. */
+static const u16_t memp_num[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) (num),
+#include "lwip/memp_std.h"
+};
+
+/** This array holds a textual description of each pool. */
+#ifdef LWIP_DEBUG
+static const char *memp_desc[MEMP_MAX] = {
+#define LWIP_MEMPOOL(name,num,size,desc) (desc),
+#include "lwip/memp_std.h"
+};
+#endif /* LWIP_DEBUG */
+
+/** This is the actual memory used by the pools. */
+static u8_t memp_memory[MEM_ALIGNMENT - 1
+#define LWIP_MEMPOOL(name,num,size,desc) + ( (num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size) ) )
+#include "lwip/memp_std.h"
+];
+
+#if MEMP_SANITY_CHECK
+/**
+ * Check that memp-lists don't form a circle
+ */
+static int
+memp_sanity(void)
+{
+ s16_t i, c;
+ struct memp *m, *n;
+
+ for (i = 0; i < MEMP_MAX; i++) {
+ for (m = memp_tab[i]; m != NULL; m = m->next) {
+ c = 1;
+ for (n = memp_tab[i]; n != NULL; n = n->next) {
+ if (n == m && --c < 0) {
+ return 0;
+ }
+ }
+ }
+ }
+ return 1;
+}
+#endif /* MEMP_SANITY_CHECK*/
+#if MEMP_OVERFLOW_CHECK
+/**
+ * Check if a memp element was victim of an overflow
+ * (e.g. the restricted area after it has been altered)
+ *
+ * @param p the memp element to check
+ * @param memp_size the element size of the pool p comes from
+ */
+static void
+memp_overflow_check_element(struct memp *p, u16_t memp_size)
+{
+ u16_t k;
+ u8_t *m;
+#if MEMP_SANITY_REGION_BEFORE_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE - MEMP_SANITY_REGION_BEFORE_ALIGNED;
+ for (k = 0; k < MEMP_SANITY_REGION_BEFORE_ALIGNED; k++) {
+ if (m[k] != 0xcd) {
+ LWIP_ASSERT("detected memp underflow!", 0);
+ }
+ }
+#endif
+#if MEMP_SANITY_REGION_AFTER_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE + memp_size;
+ for (k = 0; k < MEMP_SANITY_REGION_AFTER_ALIGNED; k++) {
+ if (m[k] != 0xcd) {
+ LWIP_ASSERT("detected memp overflow!", 0);
+ }
+ }
+#endif
+}
+
+/**
+ * Do an overflow check for all elements in every pool.
+ *
+ * @see memp_overflow_check_element for a description of the check
+ */
+static void
+memp_overflow_check_all(void)
+{
+ u16_t i, j;
+ struct memp *p;
+
+ p = LWIP_MEM_ALIGN(memp_memory);
+ for (i = 0; i < MEMP_MAX; ++i) {
+ p = p;
+ for (j = 0; j < memp_num[i]; ++j) {
+ memp_overflow_check_element(p, memp_sizes[i]);
+ p = (struct memp*)((u8_t*)p + MEMP_SIZE + memp_sizes[i] + MEMP_SANITY_REGION_AFTER_ALIGNED);
+ }
+ }
+}
+
+/**
+ * Initialize the restricted areas of all memp elements in every pool.
+ */
+static void
+memp_overflow_init(void)
+{
+ u16_t i, j;
+ struct memp *p;
+ u8_t *m;
+
+ p = LWIP_MEM_ALIGN(memp_memory);
+ for (i = 0; i < MEMP_MAX; ++i) {
+ p = p;
+ for (j = 0; j < memp_num[i]; ++j) {
+#if MEMP_SANITY_REGION_BEFORE_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE - MEMP_SANITY_REGION_BEFORE_ALIGNED;
+ memset(m, 0xcd, MEMP_SANITY_REGION_BEFORE_ALIGNED);
+#endif
+#if MEMP_SANITY_REGION_AFTER_ALIGNED > 0
+ m = (u8_t*)p + MEMP_SIZE + memp_sizes[i];
+ memset(m, 0xcd, MEMP_SANITY_REGION_AFTER_ALIGNED);
+#endif
+ p = (struct memp*)((u8_t*)p + MEMP_SIZE + memp_sizes[i] + MEMP_SANITY_REGION_AFTER_ALIGNED);
+ }
+ }
+}
+#endif /* MEMP_OVERFLOW_CHECK */
+
+/**
+ * Initialize this module.
+ *
+ * Carves out memp_memory into linked lists for each pool-type.
+ */
+void
+memp_init(void)
+{
+ struct memp *memp;
+ u16_t i, j;
+
+ for (i = 0; i < MEMP_MAX; ++i) {
+ MEMP_STATS_AVAIL(used, i, 0);
+ MEMP_STATS_AVAIL(max, i, 0);
+ MEMP_STATS_AVAIL(err, i, 0);
+ MEMP_STATS_AVAIL(avail, i, memp_num[i]);
+ }
+
+ memp = LWIP_MEM_ALIGN(memp_memory);
+ /* for every pool: */
+ for (i = 0; i < MEMP_MAX; ++i) {
+ memp_tab[i] = NULL;
+ /* create a linked list of memp elements */
+ for (j = 0; j < memp_num[i]; ++j) {
+ memp->next = memp_tab[i];
+ memp_tab[i] = memp;
+ memp = (struct memp *)((u8_t *)memp + MEMP_SIZE + memp_sizes[i]
+#if MEMP_OVERFLOW_CHECK
+ + MEMP_SANITY_REGION_AFTER_ALIGNED
+#endif
+ );
+ }
+ }
+#if MEMP_OVERFLOW_CHECK
+ memp_overflow_init();
+ /* check everything a first time to see if it worked */
+ memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK */
+}
+
+/**
+ * Get an element from a specific pool.
+ *
+ * @param type the pool to get an element from
+ *
+ * the debug version has two more parameters:
+ * @param file file name calling this function
+ * @param line number of line where this function is called
+ *
+ * @return a pointer to the allocated memory or a NULL pointer on error
+ */
+void *
+#if !MEMP_OVERFLOW_CHECK
+memp_malloc(memp_t type)
+#else
+memp_malloc_fn(memp_t type, const char* file, const int line)
+#endif
+{
+ struct memp *memp;
+ SYS_ARCH_DECL_PROTECT(old_level);
+
+ LWIP_ERROR("memp_malloc: type < MEMP_MAX", (type < MEMP_MAX), return NULL;);
+
+ SYS_ARCH_PROTECT(old_level);
+#if MEMP_OVERFLOW_CHECK >= 2
+ memp_overflow_check_all();
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+
+ memp = memp_tab[type];
+
+ if (memp != NULL) {
+ memp_tab[type] = memp->next;
+#if MEMP_OVERFLOW_CHECK
+ memp->next = NULL;
+ memp->file = file;
+ memp->line = line;
+#endif /* MEMP_OVERFLOW_CHECK */
+ MEMP_STATS_INC_USED(used, type);
+ LWIP_ASSERT("memp_malloc: memp properly aligned",
+ ((mem_ptr_t)memp % MEM_ALIGNMENT) == 0);
+ memp = (struct memp*)((u8_t*)memp + MEMP_SIZE);
+ } else {
+ LWIP_DEBUGF(MEMP_DEBUG | 2, ("memp_malloc: out of memory in pool %s\n", memp_desc[type]));
+ MEMP_STATS_INC(err, type);
+ }
+
+ SYS_ARCH_UNPROTECT(old_level);
+
+ return memp;
+}
+
+/**
+ * Put an element back into its pool.
+ *
+ * @param type the pool where to put mem
+ * @param mem the memp element to free
+ */
+void
+memp_free(memp_t type, void *mem)
+{
+ struct memp *memp;
+ SYS_ARCH_DECL_PROTECT(old_level);
+
+ if (mem == NULL) {
+ return;
+ }
+ LWIP_ASSERT("memp_free: mem properly aligned",
+ ((mem_ptr_t)mem % MEM_ALIGNMENT) == 0);
+
+ memp = (struct memp *)((u8_t*)mem - MEMP_SIZE);
+
+ SYS_ARCH_PROTECT(old_level);
+#if MEMP_OVERFLOW_CHECK
+#if MEMP_OVERFLOW_CHECK >= 2
+ memp_overflow_check_all();
+#else
+ memp_overflow_check_element(memp, memp_sizes[type]);
+#endif /* MEMP_OVERFLOW_CHECK >= 2 */
+#endif /* MEMP_OVERFLOW_CHECK */
+
+ MEMP_STATS_DEC(used, type);
+
+ memp->next = memp_tab[type];
+ memp_tab[type] = memp;
+
+#if MEMP_SANITY_CHECK
+ LWIP_ASSERT("memp sanity", memp_sanity());
+#endif /* MEMP_SANITY_CHECK */
+
+ SYS_ARCH_UNPROTECT(old_level);
+}
+
+#endif /* MEMP_MEM_MALLOC */
diff --git a/core/lwip/src/core/netif.c b/core/lwip/src/core/netif.c
new file mode 100644
index 00000000..c9b6b9b5
--- /dev/null
+++ b/core/lwip/src/core/netif.c
@@ -0,0 +1,655 @@
+/**
+ * @file
+ * lwIP network interface abstraction
+ *
+ */
+
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
+ * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
+ * OF SUCH DAMAGE.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/def.h"
+#include "lwip/ip_addr.h"
+#include "lwip/netif.h"
+#include "lwip/tcp.h"
+#include "lwip/snmp.h"
+#include "lwip/igmp.h"
+#include "netif/etharp.h"
+#if ENABLE_LOOPBACK
+#include "lwip/sys.h"
+#if LWIP_NETIF_LOOPBACK_MULTITHREADING
+#include "lwip/tcpip.h"
+#endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
+#endif /* ENABLE_LOOPBACK */
+
+#if LWIP_NETIF_STATUS_CALLBACK
+#define NETIF_STATUS_CALLBACK(n) { if (n->status_callback) (n->status_callback)(n); }
+#else
+#define NETIF_STATUS_CALLBACK(n) { /* NOP */ }
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+
+#if LWIP_NETIF_LINK_CALLBACK
+#define NETIF_LINK_CALLBACK(n) { if (n->link_callback) (n->link_callback)(n); }
+#else
+#define NETIF_LINK_CALLBACK(n) { /* NOP */ }
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+
+struct netif *netif_list;
+struct netif *netif_default;
+
+/**
+ * Add a network interface to the list of lwIP netifs.
+ *
+ * @param netif a pre-allocated netif structure
+ * @param ipaddr IP address for the new netif
+ * @param netmask network mask for the new netif
+ * @param gw default gateway IP address for the new netif
+ * @param state opaque data passed to the new netif
+ * @param init callback function that initializes the interface
+ * @param input callback function that is called to pass
+ * ingress packets up in the protocol layer stack.
+ *
+ * @return netif, or NULL if failed.
+ */
+struct netif *
+netif_add(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
+ struct ip_addr *gw,
+ void *state,
+ err_t (* init)(struct netif *netif),
+ err_t (* input)(struct pbuf *p, struct netif *netif))
+{
+ static u8_t netifnum = 0;
+
+ /* reset new interface configuration state */
+ netif->ip_addr.addr = 0;
+ netif->netmask.addr = 0;
+ netif->gw.addr = 0;
+ netif->flags = 0;
+#if LWIP_DHCP
+ /* netif not under DHCP control by default */
+ netif->dhcp = NULL;
+#endif /* LWIP_DHCP */
+#if LWIP_AUTOIP
+ /* netif not under AutoIP control by default */
+ netif->autoip = NULL;
+#endif /* LWIP_AUTOIP */
+#if LWIP_NETIF_STATUS_CALLBACK
+ netif->status_callback = NULL;
+#endif /* LWIP_NETIF_STATUS_CALLBACK */
+#if LWIP_NETIF_LINK_CALLBACK
+ netif->link_callback = NULL;
+#endif /* LWIP_NETIF_LINK_CALLBACK */
+#if LWIP_IGMP
+ netif->igmp_mac_filter = NULL;
+#endif /* LWIP_IGMP */
+#if ENABLE_LOOPBACK
+ netif->loop_first = NULL;
+ netif->loop_last = NULL;
+#endif /* ENABLE_LOOPBACK */
+
+ /* remember netif specific state information data */
+ netif->state = state;
+ netif->num = netifnum++;
+ netif->input = input;
+#if LWIP_NETIF_HWADDRHINT
+ netif->addr_hint = NULL;
+#endif /* LWIP_NETIF_HWADDRHINT*/
+#if ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS
+ netif->loop_cnt_current = 0;
+#endif /* ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS */
+
+ netif_set_addr(netif, ipaddr, netmask, gw);
+
+ /* call user specified initialization function for netif */
+ if (init(netif) != ERR_OK) {
+ return NULL;
+ }
+
+ /* add this netif to the list */
+ netif->next = netif_list;
+ netif_list = netif;
+ snmp_inc_iflist();
+
+#if LWIP_IGMP
+ /* start IGMP processing */
+ if (netif->flags & NETIF_FLAG_IGMP) {
+ igmp_start( netif);
+ }
+#endif /* LWIP_IGMP */
+
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
+ netif->name[0], netif->name[1]));
+ ip_addr_debug_print(NETIF_DEBUG, ipaddr);
+ LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
+ ip_addr_debug_print(NETIF_DEBUG, netmask);
+ LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
+ ip_addr_debug_print(NETIF_DEBUG, gw);
+ LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
+ return netif;
+}
+
+/**
+ * Change IP address configuration for a network interface (including netmask
+ * and default gateway).
+ *
+ * @param netif the network interface to change
+ * @param ipaddr the new IP address
+ * @param netmask the new netmask
+ * @param gw the new default gateway
+ */
+void
+netif_set_addr(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
+ struct ip_addr *gw)
+{
+ netif_set_ipaddr(netif, ipaddr);
+ netif_set_netmask(netif, netmask);
+ netif_set_gw(netif, gw);
+}
+
+/**
+ * Remove a network interface from the list of lwIP netifs.
+ *
+ * @param netif the network interface to remove
+ */
+void netif_remove(struct netif * netif)
+{
+ if ( netif == NULL ) return;
+
+#if LWIP_IGMP
+ /* stop IGMP processing */
+ if (netif->flags & NETIF_FLAG_IGMP) {
+ igmp_stop( netif);
+ }
+#endif /* LWIP_IGMP */
+
+ snmp_delete_ipaddridx_tree(netif);
+
+ /* is it the first netif? */
+ if (netif_list == netif) {
+ netif_list = netif->next;
+ snmp_dec_iflist();
+ }
+ else {
+ /* look for netif further down the list */
+ struct netif * tmpNetif;
+ for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
+ if (tmpNetif->next == netif) {
+ tmpNetif->next = netif->next;
+ snmp_dec_iflist();
+ break;
+ }
+ }
+ if (tmpNetif == NULL)
+ return; /* we didn't find any netif today */
+ }
+ /* this netif is default? */
+ if (netif_default == netif)
+ /* reset default netif */
+ netif_set_default(NULL);
+ LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
+}
+
+/**
+ * Find a network interface by searching for its name
+ *
+ * @param name the name of the netif (like netif->name) plus concatenated number
+ * in ascii representation (e.g. 'en0')
+ */
+struct netif *
+netif_find(char *name)
+{
+ struct netif *netif;
+ u8_t num;
+
+ if (name == NULL) {
+ return NULL;
+ }
+
+ num = name[2] - '0';
+
+ for(netif = netif_list; netif != NULL; netif = netif->next) {
+ if (num == netif->num &&
+ name[0] == netif->name[0] &&
+ name[1] == netif->name[1]) {
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
+ return netif;
+ }
+ }
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
+ return NULL;
+}
+
+/**
+ * Change the IP address of a network interface
+ *
+ * @param netif the network interface to change
+ * @param ipaddr the new IP address
+ *
+ * @note call netif_set_addr() if you also want to change netmask and
+ * default gateway
+ */
+void
+netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
+{
+ /* TODO: Handling of obsolete pcbs */
+ /* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
+#if LWIP_TCP
+ struct tcp_pcb *pcb;
+ struct tcp_pcb_listen *lpcb;
+
+ /* address is actually being changed? */
+ if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
+ {
+ /* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
+ LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: netif address being changed\n"));
+ pcb = tcp_active_pcbs;
+ while (pcb != NULL) {
+ /* PCB bound to current local interface address? */
+ if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
+ /* this connection must be aborted */
+ struct tcp_pcb *next = pcb->next;
+ LWIP_DEBUGF(NETIF_DEBUG | 1, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
+ tcp_abort(pcb);
+ pcb = next;
+ } else {
+ pcb = pcb->next;
+ }
+ }
+ for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
+ /* PCB bound to current local interface address? */
+ if ((!(ip_addr_isany(&(lpcb->local_ip)))) &&
+ (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr)))) {
+ /* The PCB is listening to the old ipaddr and
+ * is set to listen to the new one instead */
+ ip_addr_set(&(lpcb->local_ip), ipaddr);
+ }
+ }
+ }
+#endif
+ snmp_delete_ipaddridx_tree(netif);
+ snmp_delete_iprteidx_tree(0,netif);
+ /* set new IP address to netif */
+ ip_addr_set(&(netif->ip_addr), ipaddr);
+ snmp_insert_ipaddridx_tree(netif);
+ snmp_insert_iprteidx_tree(0,netif);
+
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 3, ("netif: IP address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ netif->name[0], netif->name[1],
+ ip4_addr1(&netif->ip_addr),
+ ip4_addr2(&netif->ip_addr),
+ ip4_addr3(&netif->ip_addr),
+ ip4_addr4(&netif->ip_addr)));
+}
+
+/**
+ * Change the default gateway for a network interface
+ *
+ * @param netif the network interface to change
+ * @param gw the new default gateway
+ *
+ * @note call netif_set_addr() if you also want to change ip address and netmask
+ */
+void
+netif_set_gw(struct netif *netif, struct ip_addr *gw)
+{
+ ip_addr_set(&(netif->gw), gw);
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 3, ("netif: GW address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ netif->name[0], netif->name[1],
+ ip4_addr1(&netif->gw),
+ ip4_addr2(&netif->gw),
+ ip4_addr3(&netif->gw),
+ ip4_addr4(&netif->gw)));
+}
+
+/**
+ * Change the netmask of a network interface
+ *
+ * @param netif the network interface to change
+ * @param netmask the new netmask
+ *
+ * @note call netif_set_addr() if you also want to change ip address and
+ * default gateway
+ */
+void
+netif_set_netmask(struct netif *netif, struct ip_addr *netmask)
+{
+ snmp_delete_iprteidx_tree(0, netif);
+ /* set new netmask to netif */
+ ip_addr_set(&(netif->netmask), netmask);
+ snmp_insert_iprteidx_tree(0, netif);
+ LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE | 3, ("netif: netmask of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
+ netif->name[0], netif->name[1],
+ ip4_addr1(&netif->netmask),
+ ip4_addr2(&netif->netmask),
+ ip4_addr3(&netif->netmask),
+ ip4_addr4(&netif->netmask)));
+}
+
+/**
+ * Set a network interface as the default network interface
+ * (used to output all packets for which no specific route is found)
+ *
+ * @param netif the default network interface
+ */
+void
+netif_set_default(struct netif *netif)
+{
+ if (netif == NULL)
+ {
+ /* remove default route */
+ snmp_delete_iprteidx_tree(1, netif);
+ }
+ else
+ {
+ /* install default route */
+ snmp_insert_iprteidx_tree(1, netif);
+ }
+ netif_default = netif;
+ LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
+ netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
+}
+
+/**
+ * Bring an interface up, available for processing
+ * traffic.
+ *
+ * @note: Enabling DHCP on a down interface will make it come
+ * up once configured.
+ *
+ * @see dhcp_start()
+ */
+void netif_set_up(struct netif *netif)
+{
+ if ( !(netif->flags & NETIF_FLAG_UP )) {
+ netif->flags |= NETIF_FLAG_UP;
+
+#if LWIP_SNMP
+ snmp_get_sysuptime(&netif->ts);