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ip.c
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1
9/*
10 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
11 * All rights reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without modification,
14 * are permitted provided that the following conditions are met:
15 *
16 * 1. Redistributions of source code must retain the above copyright notice,
17 * this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright notice,
19 * this list of conditions and the following disclaimer in the documentation
20 * and/or other materials provided with the distribution.
21 * 3. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
25 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
26 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
27 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
28 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
29 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
32 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * OF SUCH DAMAGE.
34 *
35 * This file is part of the lwIP TCP/IP stack.
36 *
37 * Author: Adam Dunkels <adam@sics.se>
38 *
39 */
40
41#include "lwip/opt.h"
42#include "lwip/ip.h"
43#include "lwip/def.h"
44#include "lwip/mem.h"
45#include "lwip/ip_frag.h"
46#include "lwip/inet_chksum.h"
47#include "lwip/netif.h"
48#include "lwip/icmp.h"
49#include "lwip/igmp.h"
50#include "lwip/raw.h"
51#include "lwip/udp.h"
52#include "lwip/tcp_impl.h"
53#include "lwip/snmp.h"
54#include "lwip/dhcp.h"
55#include "lwip/autoip.h"
56#include "lwip/stats.h"
57#include "arch/perf.h"
58
59#include <string.h>
60
63#ifndef LWIP_INLINE_IP_CHKSUM
64#define LWIP_INLINE_IP_CHKSUM 1
65#endif
66#if LWIP_INLINE_IP_CHKSUM && CHECKSUM_GEN_IP
67#define CHECKSUM_GEN_IP_INLINE 1
68#else
69#define CHECKSUM_GEN_IP_INLINE 0
70#endif
71
72#if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
73#define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
74
80#if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
81/* accept DHCP client port and custom port */
82#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
83 || (LWIP_IP_ACCEPT_UDP_PORT(port)))
84#elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
85/* accept custom port only */
86#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(port))
87#else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
88/* accept DHCP client port only */
89#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
90#endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
91
92#else /* LWIP_DHCP */
93#define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
94#endif /* LWIP_DHCP */
95
101
105const struct ip_hdr *current_header;
110
112static u16_t ip_id;
113
123struct netif *
125{
126 struct netif *netif;
127
128#ifdef LWIP_HOOK_IP4_ROUTE
129 netif = LWIP_HOOK_IP4_ROUTE(dest);
130 if (netif != NULL) {
131 return netif;
132 }
133#endif
134
135 /* iterate through netifs */
136 for (netif = netif_list; netif != NULL; netif = netif->next) {
137 /* network mask matches? */
138 if (netif_is_up(netif)) {
139 if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
140 /* return netif on which to forward IP packet */
141 return netif;
142 }
143 }
144 }
146 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_route: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
147 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
148 IP_STATS_INC(ip.rterr);
150 return NULL;
151 }
152 /* no matching netif found, use default netif */
153 return netif_default;
154}
155
156#if IP_FORWARD
165static int
166ip_canforward(struct pbuf *p)
167{
169
170 if (p->flags & PBUF_FLAG_LLBCAST) {
171 /* don't route link-layer broadcasts */
172 return 0;
173 }
174 if ((p->flags & PBUF_FLAG_LLMCAST) && !IP_MULTICAST(addr)) {
175 /* don't route link-layer multicasts unless the destination address is an IP
176 multicast address */
177 return 0;
178 }
179 if (IP_EXPERIMENTAL(addr)) {
180 return 0;
181 }
182 if (IP_CLASSA(addr)) {
183 u32_t net = addr & IP_CLASSA_NET;
184 if ((net == 0) || (net == (IP_LOOPBACKNET << IP_CLASSA_NSHIFT))) {
185 /* don't route loopback packets */
186 return 0;
187 }
188 }
189 return 1;
190}
191
201static void
202ip_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
203{
204 struct netif *netif;
205
207
208 if (!ip_canforward(p)) {
209 goto return_noroute;
210 }
211
212 /* RFC3927 2.7: do not forward link-local addresses */
214 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not forwarding LLA %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
217 goto return_noroute;
218 }
219
220 /* Find network interface where to forward this IP packet to. */
222 if (netif == NULL) {
223 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
226 /* @todo: send ICMP_DUR_NET? */
227 goto return_noroute;
228 }
229#if !IP_FORWARD_ALLOW_TX_ON_RX_NETIF
230 /* Do not forward packets onto the same network interface on which
231 * they arrived. */
232 if (netif == inp) {
233 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: not bouncing packets back on incoming interface.\n"));
234 goto return_noroute;
235 }
236#endif /* IP_FORWARD_ALLOW_TX_ON_RX_NETIF */
237
238 /* decrement TTL */
239 IPH_TTL_SET(iphdr, IPH_TTL(iphdr) - 1);
240 /* send ICMP if TTL == 0 */
241 if (IPH_TTL(iphdr) == 0) {
243#if LWIP_ICMP
244 /* Don't send ICMP messages in response to ICMP messages */
245 if (IPH_PROTO(iphdr) != IP_PROTO_ICMP) {
246 icmp_time_exceeded(p, ICMP_TE_TTL);
247 }
248#endif /* LWIP_ICMP */
249 return;
250 }
251
252 /* Incrementally update the IP checksum. */
253 if (IPH_CHKSUM(iphdr) >= PP_HTONS(0xffffU - 0x100)) {
254 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100) + 1);
255 } else {
256 IPH_CHKSUM_SET(iphdr, IPH_CHKSUM(iphdr) + PP_HTONS(0x100));
257 }
258
259 LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
262
263 IP_STATS_INC(ip.fw);
264 IP_STATS_INC(ip.xmit);
266
267 PERF_STOP("ip_forward");
268 /* don't fragment if interface has mtu set to 0 [loopif] */
269 if (netif->mtu && (p->tot_len > netif->mtu)) {
270 if ((IPH_OFFSET(iphdr) & PP_NTOHS(IP_DF)) == 0) {
271#if IP_FRAG
272 ip_frag(p, netif, ip_current_dest_addr());
273#else /* IP_FRAG */
274 /* @todo: send ICMP Destination Unreacheable code 13 "Communication administratively prohibited"? */
275#endif /* IP_FRAG */
276 } else {
277 /* send ICMP Destination Unreacheable code 4: "Fragmentation Needed and DF Set" */
278 icmp_dest_unreach(p, ICMP_DUR_FRAG);
279 }
280 return;
281 }
282 /* transmit pbuf on chosen interface */
284 return;
285return_noroute:
287}
288#endif /* IP_FORWARD */
289
304err_t
305ip_input(struct pbuf *p, struct netif *inp)
306{
307 struct ip_hdr *iphdr;
308 struct netif *netif;
309 u16_t iphdr_hlen;
310 u16_t iphdr_len;
311#if IP_ACCEPT_LINK_LAYER_ADDRESSING
312 int check_ip_src=1;
313#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
314
315 IP_STATS_INC(ip.recv);
317
318 /* identify the IP header */
319 iphdr = (struct ip_hdr *)p->payload;
320 if (IPH_V(iphdr) != 4) {
321 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IP packet dropped due to bad version number %"U16_F"\n", IPH_V(iphdr)));
323 pbuf_free(p);
324 IP_STATS_INC(ip.err);
325 IP_STATS_INC(ip.drop);
327 return ERR_OK;
328 }
329
330#ifdef LWIP_HOOK_IP4_INPUT
331 if (LWIP_HOOK_IP4_INPUT(p, inp)) {
332 /* the packet has been eaten */
333 return ERR_OK;
334 }
335#endif
336
337 /* obtain IP header length in number of 32-bit words */
338 iphdr_hlen = IPH_HL(iphdr);
339 /* calculate IP header length in bytes */
340 iphdr_hlen *= 4;
341 /* obtain ip length in bytes */
342 iphdr_len = ntohs(IPH_LEN(iphdr));
343
344 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
345 if ((iphdr_hlen > p->len) || (iphdr_len > p->tot_len)) {
346 if (iphdr_hlen > p->len) {
348 ("IP header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
349 iphdr_hlen, p->len));
350 }
351 if (iphdr_len > p->tot_len) {
353 ("IP (len %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
354 iphdr_len, p->tot_len));
355 }
356 /* free (drop) packet pbufs */
357 pbuf_free(p);
358 IP_STATS_INC(ip.lenerr);
359 IP_STATS_INC(ip.drop);
361 return ERR_OK;
362 }
363
364 /* verify checksum */
365#if CHECKSUM_CHECK_IP
366 if (inet_chksum(iphdr, iphdr_hlen) != 0) {
367
369 ("Checksum (0x%"X16_F") failed, IP packet dropped.\n", inet_chksum(iphdr, iphdr_hlen)));
371 pbuf_free(p);
372 IP_STATS_INC(ip.chkerr);
373 IP_STATS_INC(ip.drop);
375 return ERR_OK;
376 }
377#endif
378
379 /* Trim pbuf. This should have been done at the netif layer,
380 * but we'll do it anyway just to be sure that its done. */
381 pbuf_realloc(p, iphdr_len);
382
383 /* copy IP addresses to aligned ip_addr_t */
385 ip_addr_copy(current_iphdr_src, iphdr->src);
386
387 /* match packet against an interface, i.e. is this packet for us? */
388#if LWIP_IGMP
390 if ((inp->flags & NETIF_FLAG_IGMP) && (igmp_lookfor_group(inp, &current_iphdr_dest))) {
391 netif = inp;
392 } else {
393 netif = NULL;
394 }
395 } else
396#endif /* LWIP_IGMP */
397 {
398 /* start trying with inp. if that's not acceptable, start walking the
399 list of configured netifs.
400 'first' is used as a boolean to mark whether we started walking the list */
401 int first = 1;
402 netif = inp;
403 do {
404 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",
409
410 /* interface is up and configured? */
411 if ((netif_is_up(netif)) && (!ip_addr_isany(&(netif->ip_addr)))) {
412 /* unicast to this interface address? */
414 /* or broadcast on this interface network address? */
416 LWIP_DEBUGF(IP_DEBUG, ("ip_input: packet accepted on interface %c%c\n",
417 netif->name[0], netif->name[1]));
418 /* break out of for loop */
419 break;
420 }
421#if LWIP_AUTOIP
422 /* connections to link-local addresses must persist after changing
423 the netif's address (RFC3927 ch. 1.9) */
424 if ((netif->autoip != NULL) &&
425 ip_addr_cmp(&current_iphdr_dest, &(netif->autoip->llipaddr))) {
426 LWIP_DEBUGF(IP_DEBUG, ("ip_input: LLA packet accepted on interface %c%c\n",
427 netif->name[0], netif->name[1]));
428 /* break out of for loop */
429 break;
430 }
431#endif /* LWIP_AUTOIP */
432 }
433 if (first) {
434 first = 0;
436 } else {
437 netif = netif->next;
438 }
439 if (netif == inp) {
440 netif = netif->next;
441 }
442 } while(netif != NULL);
443 }
444
445#if IP_ACCEPT_LINK_LAYER_ADDRESSING
446 /* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
447 * using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
448 * According to RFC 1542 section 3.1.1, referred by RFC 2131).
449 *
450 * If you want to accept private broadcast communication while a netif is down,
451 * define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
452 *
453 * #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
454 */
455 if (netif == NULL) {
456 /* remote port is DHCP server? */
457 if (IPH_PROTO(iphdr) == IP_PROTO_UDP) {
458 struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
459 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
460 ntohs(udphdr->dest)));
461 if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(udphdr->dest)) {
462 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
463 netif = inp;
464 check_ip_src = 0;
465 }
466 }
467 }
468#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
469
470 /* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
471#if IP_ACCEPT_LINK_LAYER_ADDRESSING
472 /* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
473 if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
474#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
475 { if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) ||
477 /* packet source is not valid */
478 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_LEVEL_WARNING, ("ip_input: packet source is not valid.\n"));
479 /* free (drop) packet pbufs */
480 pbuf_free(p);
481 IP_STATS_INC(ip.drop);
484 return ERR_OK;
485 }
486 }
487
488 /* packet not for us? */
489 if (netif == NULL) {
490 /* packet not for us, route or discard */
491 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: packet not for us.\n"));
492#if IP_FORWARD
493 /* non-broadcast packet? */
495 /* try to forward IP packet on (other) interfaces */
496 ip_forward(p, iphdr, inp);
497 } else
498#endif /* IP_FORWARD */
499 {
502 }
503 pbuf_free(p);
504 return ERR_OK;
505 }
506 /* packet consists of multiple fragments? */
507 if ((IPH_OFFSET(iphdr) & PP_HTONS(IP_OFFMASK | IP_MF)) != 0) {
508#if IP_REASSEMBLY /* packet fragment reassembly code present? */
509 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",
510 ntohs(IPH_ID(iphdr)), p->tot_len, ntohs(IPH_LEN(iphdr)), !!(IPH_OFFSET(iphdr) & PP_HTONS(IP_MF)), (ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK)*8));
511 /* reassemble the packet*/
512 p = ip_reass(p);
513 /* packet not fully reassembled yet? */
514 if (p == NULL) {
515 return ERR_OK;
516 }
517 iphdr = (struct ip_hdr *)p->payload;
518#else /* IP_REASSEMBLY == 0, no packet fragment reassembly code present */
519 pbuf_free(p);
520 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since it was fragmented (0x%"X16_F") (while IP_REASSEMBLY == 0).\n",
521 ntohs(IPH_OFFSET(iphdr))));
522 IP_STATS_INC(ip.opterr);
523 IP_STATS_INC(ip.drop);
524 /* unsupported protocol feature */
526 return ERR_OK;
527#endif /* IP_REASSEMBLY */
528 }
529
530#if IP_OPTIONS_ALLOWED == 0 /* no support for IP options in the IP header? */
531
532#if LWIP_IGMP
533 /* there is an extra "router alert" option in IGMP messages which we allow for but do not police */
534 if((iphdr_hlen > IP_HLEN) && (IPH_PROTO(iphdr) != IP_PROTO_IGMP)) {
535#else
536 if (iphdr_hlen > IP_HLEN) {
537#endif /* LWIP_IGMP */
538 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("IP packet dropped since there were IP options (while IP_OPTIONS_ALLOWED == 0).\n"));
539 pbuf_free(p);
540 IP_STATS_INC(ip.opterr);
541 IP_STATS_INC(ip.drop);
542 /* unsupported protocol feature */
544 return ERR_OK;
545 }
546#endif /* IP_OPTIONS_ALLOWED == 0 */
547
548 /* send to upper layers */
549 LWIP_DEBUGF(IP_DEBUG, ("ip_input: \n"));
551 LWIP_DEBUGF(IP_DEBUG, ("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
552
553 current_netif = inp;
554 current_header = iphdr;
555
556#if LWIP_RAW
557 /* raw input did not eat the packet? */
558 if (raw_input(p, inp) == 0)
559#endif /* LWIP_RAW */
560 {
561 switch (IPH_PROTO(iphdr)) {
562#if LWIP_UDP
563 case IP_PROTO_UDP:
564#if LWIP_UDPLITE
565 case IP_PROTO_UDPLITE:
566#endif /* LWIP_UDPLITE */
568 udp_input(p, inp);
569 break;
570#endif /* LWIP_UDP */
571#if LWIP_TCP
572 case IP_PROTO_TCP:
574 tcp_input(p, inp);
575 break;
576#endif /* LWIP_TCP */
577#if LWIP_ICMP
578 case IP_PROTO_ICMP:
580 icmp_input(p, inp);
581 break;
582#endif /* LWIP_ICMP */
583#if LWIP_IGMP
584 case IP_PROTO_IGMP:
585 igmp_input(p, inp, &current_iphdr_dest);
586 break;
587#endif /* LWIP_IGMP */
588 default:
589#if LWIP_ICMP
590 /* send ICMP destination protocol unreachable unless is was a broadcast */
593 p->payload = iphdr;
594 icmp_dest_unreach(p, ICMP_DUR_PROTO);
595 }
596#endif /* LWIP_ICMP */
597 pbuf_free(p);
598
599 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("Unsupported transport protocol %"U16_F"\n", IPH_PROTO(iphdr)));
600
601 IP_STATS_INC(ip.proterr);
602 IP_STATS_INC(ip.drop);
604 }
605 }
606
611
612 return ERR_OK;
613}
614
640err_t
642 u8_t ttl, u8_t tos,
643 u8_t proto, struct netif *netif)
644{
645#if IP_OPTIONS_SEND
646 return ip_output_if_opt(p, src, dest, ttl, tos, proto, netif, NULL, 0);
647}
648
655err_t ip_output_if_opt(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
656 u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
657 u16_t optlen)
658{
659#endif /* IP_OPTIONS_SEND */
660 struct ip_hdr *iphdr;
661 ip_addr_t dest_addr;
662#if CHECKSUM_GEN_IP_INLINE
663 u32_t chk_sum = 0;
664#endif /* CHECKSUM_GEN_IP_INLINE */
665
666 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
667 gets altered as the packet is passed down the stack */
668 LWIP_ASSERT("p->ref == 1", p->ref == 1);
669
671
672 /* Should the IP header be generated or is it already included in p? */
673 if (dest != IP_HDRINCL) {
674 u16_t ip_hlen = IP_HLEN;
675#if IP_OPTIONS_SEND
676 u16_t optlen_aligned = 0;
677 if (optlen != 0) {
678#if CHECKSUM_GEN_IP_INLINE
679 int i;
680#endif /* CHECKSUM_GEN_IP_INLINE */
681 /* round up to a multiple of 4 */
682 optlen_aligned = ((optlen + 3) & ~3);
683 ip_hlen += optlen_aligned;
684 /* First write in the IP options */
685 if (pbuf_header(p, optlen_aligned)) {
686 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output_if_opt: not enough room for IP options in pbuf\n"));
687 IP_STATS_INC(ip.err);
689 return ERR_BUF;
690 }
691 MEMCPY(p->payload, ip_options, optlen);
692 if (optlen < optlen_aligned) {
693 /* zero the remaining bytes */
694 memset(((char*)p->payload) + optlen, 0, optlen_aligned - optlen);
695 }
696#if CHECKSUM_GEN_IP_INLINE
697 for (i = 0; i < optlen_aligned/2; i++) {
698 chk_sum += ((u16_t*)p->payload)[i];
699 }
700#endif /* CHECKSUM_GEN_IP_INLINE */
701 }
702#endif /* IP_OPTIONS_SEND */
703 /* generate IP header */
704 if (pbuf_header(p, IP_HLEN)) {
705 LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip_output: not enough room for IP header in pbuf\n"));
706
707 IP_STATS_INC(ip.err);
709 return ERR_BUF;
710 }
711
712 iphdr = (struct ip_hdr *)p->payload;
713 LWIP_ASSERT("check that first pbuf can hold struct ip_hdr",
714 (p->len >= sizeof(struct ip_hdr)));
715
716 IPH_TTL_SET(iphdr, ttl);
717 IPH_PROTO_SET(iphdr, proto);
718#if CHECKSUM_GEN_IP_INLINE
719 chk_sum += LWIP_MAKE_U16(proto, ttl);
720#endif /* CHECKSUM_GEN_IP_INLINE */
721
722 /* dest cannot be NULL here */
723 ip_addr_copy(iphdr->dest, *dest);
724#if CHECKSUM_GEN_IP_INLINE
725 chk_sum += ip4_addr_get_u32(&iphdr->dest) & 0xFFFF;
726 chk_sum += ip4_addr_get_u32(&iphdr->dest) >> 16;
727#endif /* CHECKSUM_GEN_IP_INLINE */
728
729 IPH_VHL_SET(iphdr, 4, ip_hlen / 4);
730 IPH_TOS_SET(iphdr, tos);
731#if CHECKSUM_GEN_IP_INLINE
732 chk_sum += LWIP_MAKE_U16(tos, iphdr->_v_hl);
733#endif /* CHECKSUM_GEN_IP_INLINE */
734 IPH_LEN_SET(iphdr, htons(p->tot_len));
735#if CHECKSUM_GEN_IP_INLINE
736 chk_sum += iphdr->_len;
737#endif /* CHECKSUM_GEN_IP_INLINE */
738 IPH_OFFSET_SET(iphdr, 0);
739 IPH_ID_SET(iphdr, htons(ip_id));
740#if CHECKSUM_GEN_IP_INLINE
741 chk_sum += iphdr->_id;
742#endif /* CHECKSUM_GEN_IP_INLINE */
743 ++ip_id;
744
745 if (ip_addr_isany(src)) {
746 ip_addr_copy(iphdr->src, netif->ip_addr);
747 } else {
748 /* src cannot be NULL here */
749 ip_addr_copy(iphdr->src, *src);
750 }
751
752#if CHECKSUM_GEN_IP_INLINE
753 chk_sum += ip4_addr_get_u32(&iphdr->src) & 0xFFFF;
754 chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
755 chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
756 chk_sum = (chk_sum >> 16) + chk_sum;
757 chk_sum = ~chk_sum;
758 iphdr->_chksum = chk_sum; /* network order */
759#else /* CHECKSUM_GEN_IP_INLINE */
760 IPH_CHKSUM_SET(iphdr, 0);
761#if CHECKSUM_GEN_IP
762 IPH_CHKSUM_SET(iphdr, inet_chksum(iphdr, ip_hlen));
763#endif
764#endif /* CHECKSUM_GEN_IP_INLINE */
765 } else {
766 /* IP header already included in p */
767 iphdr = (struct ip_hdr *)p->payload;
768 ip_addr_copy(dest_addr, iphdr->dest);
769 dest = &dest_addr;
770 }
771
772 IP_STATS_INC(ip.xmit);
773
774 LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
776
777#if ENABLE_LOOPBACK
778 if (ip_addr_cmp(dest, &netif->ip_addr)) {
779 /* Packet to self, enqueue it for loopback */
780 LWIP_DEBUGF(IP_DEBUG, ("netif_loop_output()"));
781 return netif_loop_output(netif, p, dest);
782 }
783#if LWIP_IGMP
784 if ((p->flags & PBUF_FLAG_MCASTLOOP) != 0) {
785 netif_loop_output(netif, p, dest);
786 }
787#endif /* LWIP_IGMP */
788#endif /* ENABLE_LOOPBACK */
789#if IP_FRAG
790 /* don't fragment if interface has mtu set to 0 [loopif] */
791 if (netif->mtu && (p->tot_len > netif->mtu)) {
792 return ip_frag(p, netif, dest);
793 }
794#endif /* IP_FRAG */
795
796 LWIP_DEBUGF(IP_DEBUG, ("netif->output()"));
797 return netif->output(netif, p, dest);
798}
799
817err_t
819 u8_t ttl, u8_t tos, u8_t proto)
820{
821 struct netif *netif;
822
823 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
824 gets altered as the packet is passed down the stack */
825 LWIP_ASSERT("p->ref == 1", p->ref == 1);
826
827 if ((netif = ip_route(dest)) == NULL) {
828 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
829 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
830 IP_STATS_INC(ip.rterr);
831 return ERR_RTE;
832 }
833
834 return ip_output_if(p, src, dest, ttl, tos, proto, netif);
835}
836
837#if LWIP_NETIF_HWADDRHINT
856err_t
857ip_output_hinted(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest,
858 u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
859{
860 struct netif *netif;
861 err_t err;
862
863 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
864 gets altered as the packet is passed down the stack */
865 LWIP_ASSERT("p->ref == 1", p->ref == 1);
866
867 if ((netif = ip_route(dest)) == NULL) {
868 LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
869 ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
870 IP_STATS_INC(ip.rterr);
871 return ERR_RTE;
872 }
873
874 NETIF_SET_HWADDRHINT(netif, addr_hint);
875 err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
877
878 return err;
879}
880#endif /* LWIP_NETIF_HWADDRHINT*/
881
882#if IP_DEBUG
883/* Print an IP header by using LWIP_DEBUGF
884 * @param p an IP packet, p->payload pointing to the IP header
885 */
886void
887ip_debug_print(struct pbuf *p)
888{
889 struct ip_hdr *iphdr = (struct ip_hdr *)p->payload;
890
891 LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
892 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
893 LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |%2"S16_F" | 0x%02"X16_F" | %5"U16_F" | (v, hl, tos, len)\n",
894 IPH_V(iphdr),
895 IPH_HL(iphdr),
896 IPH_TOS(iphdr),
897 ntohs(IPH_LEN(iphdr))));
898 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
899 LWIP_DEBUGF(IP_DEBUG, ("| %5"U16_F" |%"U16_F"%"U16_F"%"U16_F"| %4"U16_F" | (id, flags, offset)\n",
900 ntohs(IPH_ID(iphdr)),
901 ntohs(IPH_OFFSET(iphdr)) >> 15 & 1,
902 ntohs(IPH_OFFSET(iphdr)) >> 14 & 1,
903 ntohs(IPH_OFFSET(iphdr)) >> 13 & 1,
904 ntohs(IPH_OFFSET(iphdr)) & IP_OFFMASK));
905 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
906 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | 0x%04"X16_F" | (ttl, proto, chksum)\n",
907 IPH_TTL(iphdr),
908 IPH_PROTO(iphdr),
909 ntohs(IPH_CHKSUM(iphdr))));
910 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
911 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (src)\n",
912 ip4_addr1_16(&iphdr->src),
913 ip4_addr2_16(&iphdr->src),
914 ip4_addr3_16(&iphdr->src),
915 ip4_addr4_16(&iphdr->src)));
916 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
917 LWIP_DEBUGF(IP_DEBUG, ("| %3"U16_F" | %3"U16_F" | %3"U16_F" | %3"U16_F" | (dest)\n",
918 ip4_addr1_16(&iphdr->dest),
919 ip4_addr2_16(&iphdr->dest),
920 ip4_addr3_16(&iphdr->dest),
921 ip4_addr4_16(&iphdr->dest)));
922 LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
923}
924#endif /* IP_DEBUG */
unsigned int u32_t
Definition: cc.h:42
#define X16_F
Definition: cc.h:54
#define U16_F
Definition: cc.h:50
#define S16_F
Definition: cc.h:52
#define X32_F
Definition: cc.h:53
unsigned char u8_t
Definition: cc.h:38
unsigned short u16_t
Definition: cc.h:40
#define NULL
Definition: def.h:47
#define PP_HTONS(x)
Definition: def.h:88
#define LWIP_MAKE_U16(a, b)
Definition: def.h:52
#define htons(x)
Definition: def.h:77
#define PP_NTOHS(x)
Definition: def.h:89
#define ntohs(x)
Definition: def.h:78
#define LWIP_DBG_LEVEL_SERIOUS
Definition: debug.h:47
#define LWIP_DEBUGF(debug, message)
Definition: debug.h:95
#define LWIP_DBG_LEVEL_WARNING
Definition: debug.h:46
#define LWIP_ASSERT(message, assertion)
Definition: debug.h:66
#define LWIP_DBG_TRACE
Definition: debug.h:57
#define ERR_OK
Definition: err.h:52
#define ERR_RTE
Definition: err.h:56
#define ERR_BUF
Definition: err.h:54
s8_t err_t
Definition: err.h:47
u16_t inet_chksum(void *dataptr, u16_t len)
Definition: inet_chksum.c:396
const struct ip_hdr * current_header
Definition: ip.c:105
ip_addr_t current_iphdr_src
Definition: ip.c:107
err_t ip_input(struct pbuf *p, struct netif *inp)
Definition: ip.c:305
err_t ip_output_if(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t ttl, u8_t tos, u8_t proto, struct netif *netif)
Definition: ip.c:641
ip_addr_t current_iphdr_dest
Definition: ip.c:109
struct netif * current_netif
Definition: ip.c:100
err_t ip_output(struct pbuf *p, ip_addr_t *src, ip_addr_t *dest, u8_t ttl, u8_t tos, u8_t proto)
Definition: ip.c:818
struct netif * ip_route(ip_addr_t *dest)
Definition: ip.c:124
@ ICMP_TE_TTL
Definition: icmp.h:66
@ ICMP_DUR_PROTO
Definition: icmp.h:59
@ ICMP_DUR_FRAG
Definition: icmp.h:61
#define IPH_VHL_SET(hdr, v, hl)
Definition: ip.h:156
#define IPH_V(hdr)
Definition: ip.h:146
#define IPH_LEN_SET(hdr, len)
Definition: ip.h:158
#define IPH_TTL(hdr)
Definition: ip.h:152
#define IPH_TOS(hdr)
Definition: ip.h:148
#define IPH_ID_SET(hdr, id)
Definition: ip.h:159
#define IP_PROTO_UDPLITE
Definition: ip.h:55
#define IPH_PROTO_SET(hdr, proto)
Definition: ip.h:162
#define IPH_OFFSET_SET(hdr, off)
Definition: ip.h:160
#define IP_HDRINCL
Definition: ip.h:64
#define IP_PROTO_IGMP
Definition: ip.h:53
#define IPH_OFFSET(hdr)
Definition: ip.h:151
#define IP_PROTO_TCP
Definition: ip.h:56
#define IP_PROTO_UDP
Definition: ip.h:54
#define IPH_CHKSUM(hdr)
Definition: ip.h:154
#define IPH_HL(hdr)
Definition: ip.h:147
#define ip_debug_print(p)
Definition: ip.h:214
#define ip_current_dest_addr()
Definition: ip.h:202
#define IPH_TTL_SET(hdr, ttl)
Definition: ip.h:161
#define IPH_PROTO(hdr)
Definition: ip.h:153
#define IP_PROTO_ICMP
Definition: ip.h:52
#define IP_OFFMASK
Definition: ip.h:130
#define IP_HLEN
Definition: ip.h:50
#define IP_DF
Definition: ip.h:128
#define IPH_ID(hdr)
Definition: ip.h:150
#define IP_MF
Definition: ip.h:129
#define IPH_LEN(hdr)
Definition: ip.h:149
#define IPH_CHKSUM_SET(hdr, chksum)
Definition: ip.h:163
#define IPH_TOS_SET(hdr, tos)
Definition: ip.h:157
#define ip_addr_cmp(addr1, addr2)
Definition: ip_addr.h:198
#define ip_addr_isany(addr1)
Definition: ip_addr.h:200
#define ip4_addr1_16(ipaddr)
Definition: ip_addr.h:226
#define IP_CLASSA(a)
Definition: ip_addr.h:108
#define ip_addr_ismulticast(addr1)
Definition: ip_addr.h:208
#define ip_addr_netcmp(addr1, addr2, mask)
Definition: ip_addr.h:194
#define ip4_addr2_16(ipaddr)
Definition: ip_addr.h:227
#define IP_CLASSA_NET
Definition: ip_addr.h:109
#define IP_MULTICAST(a)
Definition: ip_addr.h:129
#define ip_addr_islinklocal(addr1)
Definition: ip_addr.h:210
#define ip_addr_copy(dest, src)
Definition: ip_addr.h:162
typedefPACK_STRUCT_END struct ip_addr ip_addr_t
Definition: ip_addr.h:64
#define ip_addr_isbroadcast(ipaddr, netif)
Definition: ip_addr.h:202
#define ip_addr_set_any(ipaddr)
Definition: ip_addr.h:170
#define ip4_addr3_16(ipaddr)
Definition: ip_addr.h:228
#define IP_LOOPBACKNET
Definition: ip_addr.h:134
#define IP_EXPERIMENTAL(a)
Definition: ip_addr.h:131
#define ip4_addr4_16(ipaddr)
Definition: ip_addr.h:229
#define ip4_addr_get_u32(src_ipaddr)
Definition: ip_addr.h:181
#define IP_CLASSA_NSHIFT
Definition: ip_addr.h:110
struct netif * netif_list
Definition: netif.c:75
struct netif * netif_default
Definition: netif.c:76
#define netif_is_up(netif)
Definition: netif.h:282
#define NETIF_FLAG_IGMP
Definition: netif.h:95
#define NETIF_SET_HWADDRHINT(netif, hint)
Definition: netif.h:321
#define IP_DEBUG
Definition: opt.h:1961
#define MEMCPY(dst, src, len)
Definition: opt.h:84
u8_t pbuf_header(struct pbuf *p, s16_t header_size_increment)
Definition: pbuf.c:511
void pbuf_realloc(struct pbuf *p, u16_t new_len)
Definition: pbuf.c:430
u8_t pbuf_free(struct pbuf *p)
Definition: pbuf.c:618
#define PBUF_FLAG_LLBCAST
Definition: pbuf.h:73
#define PBUF_FLAG_MCASTLOOP
Definition: pbuf.h:71
#define PBUF_FLAG_LLMCAST
Definition: pbuf.h:75
#define PERF_STOP(x)
Definition: perf.h:39
#define PERF_START
Definition: perf.h:38
#define snmp_inc_ipinhdrerrors()
Definition: snmp.h:262
#define snmp_inc_ipoutnoroutes()
Definition: snmp.h:270
#define snmp_inc_ipindelivers()
Definition: snmp.h:267
#define snmp_inc_ipindiscards()
Definition: snmp.h:266
#define snmp_inc_ipoutrequests()
Definition: snmp.h:268
#define snmp_inc_ipinaddrerrors()
Definition: snmp.h:263
#define snmp_inc_ipforwdatagrams()
Definition: snmp.h:264
#define snmp_inc_ipinunknownprotos()
Definition: snmp.h:265
#define snmp_inc_ipoutdiscards()
Definition: snmp.h:269
#define snmp_inc_ipinreceives()
Definition: snmp.h:261
#define IP_STATS_INC(x)
Definition: stats.h:203
Definition: ip.h:116
struct ip_addr src dest
Definition: ip.h:96
Definition: vjbsdhdr.h:15
Definition: netif.h:136
u8_t flags
Definition: netif.h:192
char name[2]
Definition: netif.h:194
ip_addr_t netmask
Definition: netif.h:142
netif_output_fn output
Definition: netif.h:151
ip_addr_t ip_addr
Definition: netif.h:141
u8_t num
Definition: netif.h:196
u16_t mtu
Definition: netif.h:186
struct netif * next
Definition: netif.h:138
Definition: pbuf.h:79
u16_t ref
Definition: pbuf.h:109
u16_t tot_len
Definition: pbuf.h:93
u16_t len
Definition: pbuf.h:96
void * payload
Definition: pbuf.h:84
u8_t flags
Definition: pbuf.h:102