8 * Copyright (c) 2010 Inico Technologies Ltd.
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
33 * This file is part of the lwIP TCP/IP stack.
35 * Author: Ivan Delamer <delamer@inicotech.com>
38 * Please coordinate changes and requests with Ivan Delamer
39 * <delamer@inicotech.com>
45 #if LWIP_IPV6 /* don't build if not configured for use in lwipopts.h */
49 #include "lwip/netif.h"
51 #include "lwip/ip6_addr.h"
52 #include "lwip/ip6_frag.h"
53 #include "lwip/icmp6.h"
56 #include "lwip/tcp_impl.h"
57 #include "lwip/dhcp6.h"
59 #include "lwip/mld6.h"
60 #include "lwip/debug.h"
61 #include "lwip/stats.h"
65 * Finds the appropriate network interface for a given IPv6 address. It tries to select
66 * a netif following a sequence of heuristics:
67 * 1) if there is only 1 netif, return it
68 * 2) if the destination is a link-local address, try to match the src address to a netif.
69 * this is a tricky case because with multiple netifs, link-local addresses only have
70 * meaning within a particular subnet/link.
71 * 3) tries to match the destination subnet to a configured address
72 * 4) tries to find a router
73 * 5) tries to match the source address to the netif
74 * 6) returns the default netif, if configured
76 * @param src the source IPv6 address, if known
77 * @param dest the destination IPv6 address for which to find the route
78 * @return the netif on which to send to reach dest
81 ip6_route(struct ip6_addr *src, struct ip6_addr *dest)
86 /* If single netif configuration, fast return. */
87 if ((netif_list != NULL) && (netif_list->next == NULL)) {
91 /* Special processing for link-local addresses. */
92 if (ip6_addr_islinklocal(dest)) {
93 if (ip6_addr_isany(src)) {
94 /* Use default netif. */
98 /* Try to find the netif for the source address. */
99 for(netif = netif_list; netif != NULL; netif = netif->next) {
100 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
101 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
102 ip6_addr_cmp(src, netif_ip6_addr(netif, i))) {
108 /* netif not found, use default netif */
109 return netif_default;
112 /* See if the destination subnet matches a configured address. */
113 for(netif = netif_list; netif != NULL; netif = netif->next) {
114 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
115 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
116 ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
122 /* Get the netif for a suitable router. */
123 i = nd6_select_router(dest, NULL);
125 if (default_router_list[i].neighbor_entry != NULL) {
126 if (default_router_list[i].neighbor_entry->netif != NULL) {
127 return default_router_list[i].neighbor_entry->netif;
132 /* try with the netif that matches the source address. */
133 if (!ip6_addr_isany(src)) {
134 for(netif = netif_list; netif != NULL; netif = netif->next) {
135 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
136 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
137 ip6_addr_cmp(src, netif_ip6_addr(netif, i))) {
144 /* no matching netif found, use default netif */
145 return netif_default;
149 * Select the best IPv6 source address for a given destination
150 * IPv6 address. Loosely follows RFC 3484. "Strong host" behavior
153 * @param netif the netif on which to send a packet
154 * @param dest the destination we are trying to reach
155 * @return the most suitable source address to use, or NULL if no suitable
156 * source address is found
159 ip6_select_source_address(struct netif *netif, ip6_addr_t * dest)
161 ip6_addr_t * src = NULL;
164 /* If dest is link-local, choose a link-local source. */
165 if (ip6_addr_islinklocal(dest) || ip6_addr_ismulticast_linklocal(dest) || ip6_addr_ismulticast_iflocal(dest)) {
166 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
167 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
168 ip6_addr_islinklocal(netif_ip6_addr(netif, i))) {
169 return netif_ip6_addr(netif, i);
174 /* Choose a site-local with matching prefix. */
175 if (ip6_addr_issitelocal(dest) || ip6_addr_ismulticast_sitelocal(dest)) {
176 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
177 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
178 ip6_addr_issitelocal(netif_ip6_addr(netif, i)) &&
179 ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
180 return netif_ip6_addr(netif, i);
185 /* Choose a unique-local with matching prefix. */
186 if (ip6_addr_isuniquelocal(dest) || ip6_addr_ismulticast_orglocal(dest)) {
187 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
188 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
189 ip6_addr_isuniquelocal(netif_ip6_addr(netif, i)) &&
190 ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
191 return netif_ip6_addr(netif, i);
196 /* Choose a global with best matching prefix. */
197 if (ip6_addr_isglobal(dest) || ip6_addr_ismulticast_global(dest)) {
198 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
199 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
200 ip6_addr_isglobal(netif_ip6_addr(netif, i))) {
202 src = netif_ip6_addr(netif, i);
205 /* Replace src only if we find a prefix match. */
206 /* TODO find longest matching prefix. */
207 if ((!(ip6_addr_netcmp(src, dest))) &&
208 ip6_addr_netcmp(netif_ip6_addr(netif, i), dest)) {
209 src = netif_ip6_addr(netif, i);
219 /* Last resort: see if arbitrary prefix matches. */
220 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
221 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
222 ip6_addr_netcmp(dest, netif_ip6_addr(netif, i))) {
223 return netif_ip6_addr(netif, i);
230 #if LWIP_IPV6_FORWARD
232 * Forwards an IPv6 packet. It finds an appropriate route for the
233 * packet, decrements the HL value of the packet, and outputs
234 * the packet on the appropriate interface.
236 * @param p the packet to forward (p->payload points to IP header)
237 * @param iphdr the IPv6 header of the input packet
238 * @param inp the netif on which this packet was received
241 ip6_forward(struct pbuf *p, struct ip6_hdr *iphdr, struct netif *inp)
245 /* do not forward link-local addresses */
246 if (ip6_addr_islinklocal(ip6_current_dest_addr())) {
247 LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not forwarding link-local address.\n"));
248 IP6_STATS_INC(ip6.rterr);
249 IP6_STATS_INC(ip6.drop);
253 /* Find network interface where to forward this IP packet to. */
254 netif = ip6_route(IP6_ADDR_ANY, ip6_current_dest_addr());
256 LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
257 IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
258 IP6_ADDR_BLOCK2(ip6_current_dest_addr()),
259 IP6_ADDR_BLOCK3(ip6_current_dest_addr()),
260 IP6_ADDR_BLOCK4(ip6_current_dest_addr()),
261 IP6_ADDR_BLOCK5(ip6_current_dest_addr()),
262 IP6_ADDR_BLOCK6(ip6_current_dest_addr()),
263 IP6_ADDR_BLOCK7(ip6_current_dest_addr()),
264 IP6_ADDR_BLOCK8(ip6_current_dest_addr())));
266 /* Don't send ICMP messages in response to ICMP messages */
267 if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
268 icmp6_dest_unreach(p, ICMP6_DUR_NO_ROUTE);
270 #endif /* LWIP_ICMP6 */
271 IP6_STATS_INC(ip6.rterr);
272 IP6_STATS_INC(ip6.drop);
275 /* Do not forward packets onto the same network interface on which
278 LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: not bouncing packets back on incoming interface.\n"));
279 IP6_STATS_INC(ip6.rterr);
280 IP6_STATS_INC(ip6.drop);
285 IP6H_HOPLIM_SET(iphdr, IP6H_HOPLIM(iphdr) - 1);
286 /* send ICMP6 if HL == 0 */
287 if (IP6H_HOPLIM(iphdr) == 0) {
289 /* Don't send ICMP messages in response to ICMP messages */
290 if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
291 icmp6_time_exceeded(p, ICMP6_TE_HL);
293 #endif /* LWIP_ICMP6 */
294 IP6_STATS_INC(ip6.drop);
298 LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: forwarding packet to %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
299 IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
300 IP6_ADDR_BLOCK2(ip6_current_dest_addr()),
301 IP6_ADDR_BLOCK3(ip6_current_dest_addr()),
302 IP6_ADDR_BLOCK4(ip6_current_dest_addr()),
303 IP6_ADDR_BLOCK5(ip6_current_dest_addr()),
304 IP6_ADDR_BLOCK6(ip6_current_dest_addr()),
305 IP6_ADDR_BLOCK7(ip6_current_dest_addr()),
306 IP6_ADDR_BLOCK8(ip6_current_dest_addr())));
308 /* transmit pbuf on chosen interface */
309 netif->output_ip6(netif, p, ip6_current_dest_addr());
310 IP6_STATS_INC(ip6.fw);
311 IP6_STATS_INC(ip6.xmit);
314 #endif /* LWIP_IPV6_FORWARD */
318 * This function is called by the network interface device driver when
319 * an IPv6 packet is received. The function does the basic checks of the
320 * IP header such as packet size being at least larger than the header
321 * size etc. If the packet was not destined for us, the packet is
322 * forwarded (using ip6_forward).
324 * Finally, the packet is sent to the upper layer protocol input function.
326 * @param p the received IPv6 packet (p->payload points to IPv6 header)
327 * @param inp the netif on which this packet was received
328 * @return ERR_OK if the packet was processed (could return ERR_* if it wasn't
329 * processed, but currently always returns ERR_OK)
332 ip6_input(struct pbuf *p, struct netif *inp)
334 struct ip6_hdr *ip6hdr;
337 u16_t hlen; /* the current header length */
339 #if IP_ACCEPT_LINK_LAYER_ADDRESSING
341 #endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
343 IP6_STATS_INC(ip6.recv);
345 /* identify the IP header */
346 ip6hdr = (struct ip6_hdr *)p->payload;
347 if (IP6H_V(ip6hdr) != 6) {
348 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_WARNING, ("IPv6 packet dropped due to bad version number %"U16_F"\n",
351 IP6_STATS_INC(ip6.err);
352 IP6_STATS_INC(ip6.drop);
356 /* header length exceeds first pbuf length, or ip length exceeds total pbuf length? */
357 if ((IP6_HLEN > p->len) || ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len)) {
358 if (IP6_HLEN > p->len) {
359 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
360 ("IPv6 header (len %"U16_F") does not fit in first pbuf (len %"U16_F"), IP packet dropped.\n",
363 if ((IP6H_PLEN(ip6hdr) + IP6_HLEN) > p->tot_len) {
364 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
365 ("IPv6 (plen %"U16_F") is longer than pbuf (len %"U16_F"), IP packet dropped.\n",
366 IP6H_PLEN(ip6hdr) + IP6_HLEN, p->tot_len));
368 /* free (drop) packet pbufs */
370 IP6_STATS_INC(ip6.lenerr);
371 IP6_STATS_INC(ip6.drop);
375 /* Trim pbuf. This should have been done at the netif layer,
376 * but we'll do it anyway just to be sure that its done. */
377 pbuf_realloc(p, IP6_HLEN + IP6H_PLEN(ip6hdr));
379 /* copy IP addresses to aligned ip6_addr_t */
380 ip6_addr_copy(ip_data.current_iphdr_dest.ip6, ip6hdr->dest);
381 ip6_addr_copy(ip_data.current_iphdr_src.ip6, ip6hdr->src);
383 /* current header pointer. */
384 ip_data.current_ip6_header = ip6hdr;
386 /* match packet against an interface, i.e. is this packet for us? */
387 if (ip6_addr_ismulticast(ip6_current_dest_addr())) {
388 /* Always joined to multicast if-local and link-local all-nodes group. */
389 if (ip6_addr_isallnodes_iflocal(ip6_current_dest_addr()) ||
390 ip6_addr_isallnodes_linklocal(ip6_current_dest_addr())) {
394 else if (mld6_lookfor_group(inp, ip6_current_dest_addr())) {
397 #else /* LWIP_IPV6_MLD */
398 else if (ip6_addr_issolicitednode(ip6_current_dest_addr())) {
399 /* Accept all solicited node packets when MLD is not enabled
400 * (for Neighbor discovery). */
403 #endif /* LWIP_IPV6_MLD */
409 /* start trying with inp. if that's not acceptable, start walking the
410 list of configured netifs.
411 'first' is used as a boolean to mark whether we started walking the list */
415 /* interface is up? */
416 if (netif_is_up(netif)) {
417 /* unicast to this interface address? address configured? */
418 for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
419 if (ip6_addr_isvalid(netif_ip6_addr_state(netif, i)) &&
420 ip6_addr_cmp(ip6_current_dest_addr(), netif_ip6_addr(netif, i))) {
421 /* exit outer loop */
435 } while(netif != NULL);
437 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet accepted on interface %c%c\n",
438 netif->name[0], netif->name[1]));
441 /* "::" packet source address? (used in duplicate address detection) */
442 if (ip6_addr_isany(ip6_current_src_addr()) &&
443 (!ip6_addr_issolicitednode(ip6_current_dest_addr()))) {
444 /* packet source is not valid */
445 /* free (drop) packet pbufs */
446 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with src ANY_ADDRESS dropped\n"));
448 IP6_STATS_INC(ip6.drop);
449 goto ip6_input_cleanup;
452 /* packet not for us? */
454 /* packet not for us, route or discard */
455 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_TRACE, ("ip6_input: packet not for us.\n"));
456 #if LWIP_IPV6_FORWARD
457 /* non-multicast packet? */
458 if (!ip6_addr_ismulticast(ip6_current_dest_addr())) {
459 /* try to forward IP packet on (other) interfaces */
460 ip6_forward(p, ip6hdr, inp);
462 #endif /* LWIP_IPV6_FORWARD */
464 goto ip6_input_cleanup;
467 /* current netif pointer. */
468 ip_data.current_netif = inp;
470 /* Save next header type. */
471 nexth = IP6H_NEXTH(ip6hdr);
473 /* Init header length. */
474 hlen = ip_data.current_ip_header_tot_len = IP6_HLEN;
476 /* Move to payload. */
477 pbuf_header(p, -IP6_HLEN);
479 /* Process known option extension headers, if present. */
480 while (nexth != IP6_NEXTH_NONE)
483 case IP6_NEXTH_HOPBYHOP:
484 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Hop-by-Hop options header\n"));
485 /* Get next header type. */
486 nexth = *((u8_t *)p->payload);
488 /* Get the header length. */
489 hlen = 8 * (1 + *((u8_t *)p->payload) + 1);
490 ip_data.current_ip_header_tot_len += hlen;
492 /* Skip over this header. */
494 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
495 ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
497 /* free (drop) packet pbufs */
499 IP6_STATS_INC(ip6.lenerr);
500 IP6_STATS_INC(ip6.drop);
501 goto ip6_input_cleanup;
504 pbuf_header(p, -hlen);
506 case IP6_NEXTH_DESTOPTS:
507 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Destination options header\n"));
508 /* Get next header type. */
509 nexth = *((u8_t *)p->payload);
511 /* Get the header length. */
512 hlen = 8 * (1 + *((u8_t *)p->payload) + 1);
513 ip_data.current_ip_header_tot_len += hlen;
515 /* Skip over this header. */
517 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
518 ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
520 /* free (drop) packet pbufs */
522 IP6_STATS_INC(ip6.lenerr);
523 IP6_STATS_INC(ip6.drop);
524 goto ip6_input_cleanup;
527 pbuf_header(p, -hlen);
529 case IP6_NEXTH_ROUTING:
530 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Routing header\n"));
531 /* Get next header type. */
532 nexth = *((u8_t *)p->payload);
534 /* Get the header length. */
535 hlen = 8 * (1 + *((u8_t *)p->payload) + 1);
536 ip_data.current_ip_header_tot_len += hlen;
538 /* Skip over this header. */
540 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
541 ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
543 /* free (drop) packet pbufs */
545 IP6_STATS_INC(ip6.lenerr);
546 IP6_STATS_INC(ip6.drop);
547 goto ip6_input_cleanup;
550 pbuf_header(p, -hlen);
553 case IP6_NEXTH_FRAGMENT:
555 struct ip6_frag_hdr * frag_hdr;
556 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header\n"));
558 frag_hdr = (struct ip6_frag_hdr *)p->payload;
560 /* Get next header type. */
561 nexth = frag_hdr->_nexth;
563 /* Fragment Header length. */
565 ip_data.current_ip_header_tot_len += hlen;
567 /* Make sure this header fits in current pbuf. */
569 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS,
570 ("IPv6 options header (hlen %"U16_F") does not fit in first pbuf (len %"U16_F"), IPv6 packet dropped.\n",
572 /* free (drop) packet pbufs */
574 IP6_FRAG_STATS_INC(ip6_frag.lenerr);
575 IP6_FRAG_STATS_INC(ip6_frag.drop);
576 goto ip6_input_cleanup;
579 /* Offset == 0 and more_fragments == 0? */
580 if (((frag_hdr->_fragment_offset & IP6_FRAG_OFFSET_MASK) == 0) &&
581 ((frag_hdr->_fragment_offset & IP6_FRAG_MORE_FLAG) == 0)) {
583 /* This is a 1-fragment packet, usually a packet that we have
584 * already reassembled. Skip this header anc continue. */
585 pbuf_header(p, -hlen);
590 /* reassemble the packet */
592 /* packet not fully reassembled yet? */
594 goto ip6_input_cleanup;
597 /* Returned p point to IPv6 header.
598 * Update all our variables and pointers and continue. */
599 ip6hdr = (struct ip6_hdr *)p->payload;
600 nexth = IP6H_NEXTH(ip6hdr);
601 hlen = ip_data.current_ip_header_tot_len = IP6_HLEN;
602 pbuf_header(p, -IP6_HLEN);
604 #else /* LWIP_IPV6_REASS */
605 /* free (drop) packet pbufs */
606 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: packet with Fragment header dropped (with LWIP_IPV6_REASS==0)\n"));
608 IP6_STATS_INC(ip6.opterr);
609 IP6_STATS_INC(ip6.drop);
610 goto ip6_input_cleanup;
611 #endif /* LWIP_IPV6_REASS */
622 /* p points to IPv6 header again. */
623 pbuf_header(p, ip_data.current_ip_header_tot_len);
625 /* send to upper layers */
626 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: \n"));
628 LWIP_DEBUGF(IP6_DEBUG, ("ip6_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len));
631 /* raw input did not eat the packet? */
632 if (raw_input(p, inp) == 0)
633 #endif /* LWIP_RAW */
642 case IP6_NEXTH_UDPLITE:
643 #endif /* LWIP_UDPLITE */
644 /* Point to payload. */
645 pbuf_header(p, -ip_data.current_ip_header_tot_len);
648 #endif /* LWIP_UDP */
651 /* Point to payload. */
652 pbuf_header(p, -ip_data.current_ip_header_tot_len);
655 #endif /* LWIP_TCP */
657 case IP6_NEXTH_ICMP6:
658 /* Point to payload. */
659 pbuf_header(p, -ip_data.current_ip_header_tot_len);
662 #endif /* LWIP_ICMP */
665 /* send ICMP parameter problem unless it was a multicast or ICMPv6 */
666 if ((!ip6_addr_ismulticast(ip6_current_dest_addr())) &&
667 (IP6H_NEXTH(ip6hdr) != IP6_NEXTH_ICMP6)) {
668 icmp6_param_problem(p, ICMP6_PP_HEADER, ip_data.current_ip_header_tot_len - hlen);
670 #endif /* LWIP_ICMP */
671 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_input: Unsupported transport protocol %"U16_F"\n", IP6H_NEXTH(ip6hdr)));
673 IP6_STATS_INC(ip6.proterr);
674 IP6_STATS_INC(ip6.drop);
680 ip_data.current_netif = NULL;
681 ip_data.current_ip6_header = NULL;
682 ip_data.current_ip_header_tot_len = 0;
683 ip6_addr_set_any(&ip_data.current_iphdr_src.ip6);
684 ip6_addr_set_any(&ip_data.current_iphdr_dest.ip6);
691 * Sends an IPv6 packet on a network interface. This function constructs
692 * the IPv6 header. If the source IPv6 address is NULL, the IPv6 "ANY" address is
693 * used as source (usually during network startup). If the source IPv6 address it
694 * IP6_ADDR_ANY, the most appropriate IPv6 address of the outgoing network
695 * interface is filled in as source address. If the destination IPv6 address is
696 * IP_HDRINCL, p is assumed to already include an IPv6 header and p->payload points
697 * to it instead of the data.
699 * @param p the packet to send (p->payload points to the data, e.g. next
700 protocol header; if dest == IP_HDRINCL, p already includes an
701 IPv6 header and p->payload points to that IPv6 header)
702 * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
703 * IP address of the netif is selected and used as source address.
704 * if src == NULL, IP6_ADDR_ANY is used as source)
705 * @param dest the destination IPv6 address to send the packet to
706 * @param hl the Hop Limit value to be set in the IPv6 header
707 * @param tc the Traffic Class value to be set in the IPv6 header
708 * @param nexth the Next Header to be set in the IPv6 header
709 * @param netif the netif on which to send this packet
710 * @return ERR_OK if the packet was sent OK
711 * ERR_BUF if p doesn't have enough space for IPv6/LINK headers
712 * returns errors returned by netif->output
715 ip6_output_if(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
717 u8_t nexth, struct netif *netif)
719 struct ip6_hdr *ip6hdr;
720 ip6_addr_t dest_addr;
722 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
723 gets altered as the packet is passed down the stack */
724 LWIP_ASSERT("p->ref == 1", p->ref == 1);
726 /* Should the IPv6 header be generated or is it already included in p? */
727 if (dest != IP_HDRINCL) {
728 /* generate IPv6 header */
729 if (pbuf_header(p, IP6_HLEN)) {
730 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: not enough room for IPv6 header in pbuf\n"));
731 IP6_STATS_INC(ip6.err);
735 ip6hdr = (struct ip6_hdr *)p->payload;
736 LWIP_ASSERT("check that first pbuf can hold struct ip6_hdr",
737 (p->len >= sizeof(struct ip6_hdr)));
739 IP6H_HOPLIM_SET(ip6hdr, hl);
740 IP6H_NEXTH_SET(ip6hdr, nexth);
742 /* dest cannot be NULL here */
743 ip6_addr_copy(ip6hdr->dest, *dest);
745 IP6H_VTCFL_SET(ip6hdr, 6, tc, 0);
746 IP6H_PLEN_SET(ip6hdr, p->tot_len - IP6_HLEN);
751 else if (ip6_addr_isany(src)) {
752 src = ip6_select_source_address(netif, dest);
753 if ((src == NULL) || ip6_addr_isany(src)) {
754 /* No appropriate source address was found for this packet. */
755 LWIP_DEBUGF(IP6_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("ip6_output: No suitable source address for packet.\n"));
756 IP6_STATS_INC(ip6.rterr);
760 /* src cannot be NULL here */
761 ip6_addr_copy(ip6hdr->src, *src);
764 /* IP header already included in p */
765 ip6hdr = (struct ip6_hdr *)p->payload;
766 ip6_addr_copy(dest_addr, ip6hdr->dest);
770 IP6_STATS_INC(ip6.xmit);
772 LWIP_DEBUGF(IP6_DEBUG, ("ip6_output_if: %c%c%"U16_F"\n", netif->name[0], netif->name[1], netif->num));
776 /* TODO implement loopback for v6
777 if (ip6_addr_cmp(dest, netif_ip6_addr(0))) {
778 return netif_loop_output(netif, p, dest);
780 #endif /* ENABLE_LOOPBACK */
782 /* don't fragment if interface has mtu set to 0 [loopif] */
783 if (netif->mtu && (p->tot_len > nd6_get_destination_mtu(dest, netif))) {
784 return ip6_frag(p, netif, dest);
786 #endif /* LWIP_IPV6_FRAG */
788 LWIP_DEBUGF(IP6_DEBUG, ("netif->output_ip6()"));
789 return netif->output_ip6(netif, p, dest);
793 * Simple interface to ip6_output_if. It finds the outgoing network
794 * interface and calls upon ip6_output_if to do the actual work.
796 * @param p the packet to send (p->payload points to the data, e.g. next
797 protocol header; if dest == IP_HDRINCL, p already includes an
798 IPv6 header and p->payload points to that IPv6 header)
799 * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
800 * IP address of the netif is selected and used as source address.
801 * if src == NULL, IP6_ADDR_ANY is used as source)
802 * @param dest the destination IPv6 address to send the packet to
803 * @param hl the Hop Limit value to be set in the IPv6 header
804 * @param tc the Traffic Class value to be set in the IPv6 header
805 * @param nexth the Next Header to be set in the IPv6 header
807 * @return ERR_RTE if no route is found
808 * see ip_output_if() for more return values
811 ip6_output(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
812 u8_t hl, u8_t tc, u8_t nexth)
816 /* pbufs passed to IPv6 must have a ref-count of 1 as their payload pointer
817 gets altered as the packet is passed down the stack */
818 LWIP_ASSERT("p->ref == 1", p->ref == 1);
820 if ((netif = ip6_route(src, dest)) == NULL) {
821 LWIP_DEBUGF(IP6_DEBUG, ("ip6_output: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
822 IP6_ADDR_BLOCK1(dest),
823 IP6_ADDR_BLOCK2(dest),
824 IP6_ADDR_BLOCK3(dest),
825 IP6_ADDR_BLOCK4(dest),
826 IP6_ADDR_BLOCK5(dest),
827 IP6_ADDR_BLOCK6(dest),
828 IP6_ADDR_BLOCK7(dest),
829 IP6_ADDR_BLOCK8(dest)));
830 IP6_STATS_INC(ip6.rterr);
834 return ip6_output_if(p, src, dest, hl, tc, nexth, netif);
838 #if LWIP_NETIF_HWADDRHINT
839 /** Like ip6_output, but takes and addr_hint pointer that is passed on to netif->addr_hint
840 * before calling ip6_output_if.
842 * @param p the packet to send (p->payload points to the data, e.g. next
843 protocol header; if dest == IP_HDRINCL, p already includes an
844 IPv6 header and p->payload points to that IPv6 header)
845 * @param src the source IPv6 address to send from (if src == IP6_ADDR_ANY, an
846 * IP address of the netif is selected and used as source address.
847 * if src == NULL, IP6_ADDR_ANY is used as source)
848 * @param dest the destination IPv6 address to send the packet to
849 * @param hl the Hop Limit value to be set in the IPv6 header
850 * @param tc the Traffic Class value to be set in the IPv6 header
851 * @param nexth the Next Header to be set in the IPv6 header
852 * @param addr_hint address hint pointer set to netif->addr_hint before
853 * calling ip_output_if()
855 * @return ERR_RTE if no route is found
856 * see ip_output_if() for more return values
859 ip6_output_hinted(struct pbuf *p, ip6_addr_t *src, ip6_addr_t *dest,
860 u8_t hl, u8_t tc, u8_t nexth, u8_t *addr_hint)
865 /* pbufs passed to IP must have a ref-count of 1 as their payload pointer
866 gets altered as the packet is passed down the stack */
867 LWIP_ASSERT("p->ref == 1", p->ref == 1);
869 if ((netif = ip6_route(src, dest)) == NULL) {
870 LWIP_DEBUGF(IP6_DEBUG, ("ip6_output: no route for %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
871 IP6_ADDR_BLOCK1(dest),
872 IP6_ADDR_BLOCK2(dest),
873 IP6_ADDR_BLOCK3(dest),
874 IP6_ADDR_BLOCK4(dest),
875 IP6_ADDR_BLOCK5(dest),
876 IP6_ADDR_BLOCK6(dest),
877 IP6_ADDR_BLOCK7(dest),
878 IP6_ADDR_BLOCK8(dest)));
879 IP6_STATS_INC(ip6.rterr);
883 NETIF_SET_HWADDRHINT(netif, addr_hint);
884 err = ip6_output_if(p, src, dest, hl, tc, nexth, netif);
885 NETIF_SET_HWADDRHINT(netif, NULL);
889 #endif /* LWIP_NETIF_HWADDRHINT*/
893 * Add a hop-by-hop options header with a router alert option and padding.
895 * Used by MLD when sending a Multicast listener report/done message.
897 * @param p the packet to which we will prepend the options header
898 * @param nexth the next header protocol number (e.g. IP6_NEXTH_ICMP6)
899 * @param value the value of the router alert option data (e.g. IP6_ROUTER_ALERT_VALUE_MLD)
900 * @return ERR_OK if hop-by-hop header was added, ERR_* otherwise
903 ip6_options_add_hbh_ra(struct pbuf * p, u8_t nexth, u8_t value)
905 struct ip6_hbh_hdr * hbh_hdr;
907 /* Move pointer to make room for hop-by-hop options header. */
908 if (pbuf_header(p, sizeof(struct ip6_hbh_hdr))) {
909 LWIP_DEBUGF(IP6_DEBUG, ("ip6_options: no space for options header\n"));
910 IP6_STATS_INC(ip6.err);
914 hbh_hdr = (struct ip6_hbh_hdr *)p->payload;
917 hbh_hdr->_nexth = nexth;
919 hbh_hdr->_ra_opt_type = IP6_ROUTER_ALERT_OPTION;
920 hbh_hdr->_ra_opt_dlen = 2;
921 hbh_hdr->_ra_opt_data = value;
922 hbh_hdr->_padn_opt_type = IP6_PADN_ALERT_OPTION;
923 hbh_hdr->_padn_opt_dlen = 0;
927 #endif /* LWIP_IPV6_MLD */
930 /* Print an IPv6 header by using LWIP_DEBUGF
931 * @param p an IPv6 packet, p->payload pointing to the IPv6 header
934 ip6_debug_print(struct pbuf *p)
936 struct ip6_hdr *ip6hdr = (struct ip6_hdr *)p->payload;
938 LWIP_DEBUGF(IP6_DEBUG, ("IPv6 header:\n"));
939 LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
940 LWIP_DEBUGF(IP6_DEBUG, ("| %2"U16_F" | %3"U16_F" | %7"U32_F" | (ver, class, flow)\n",
944 LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
945 LWIP_DEBUGF(IP6_DEBUG, ("| %5"U16_F" | %3"U16_F" | %3"U16_F" | (plen, nexth, hopl)\n",
946 ntohs(IP6H_PLEN(ip6hdr)),
947 ntohs(IP6H_NEXTH(ip6hdr)),
948 ntohs(IP6H_HOPLIM(ip6hdr))));
949 LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
950 LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (src)\n",
951 IP6_ADDR_BLOCK1(&(ip6hdr->src)),
952 IP6_ADDR_BLOCK2(&(ip6hdr->src)),
953 IP6_ADDR_BLOCK3(&(ip6hdr->src)),
954 IP6_ADDR_BLOCK4(&(ip6hdr->src))));
955 LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n",
956 IP6_ADDR_BLOCK5(&(ip6hdr->src)),
957 IP6_ADDR_BLOCK6(&(ip6hdr->src)),
958 IP6_ADDR_BLOCK7(&(ip6hdr->src)),
959 IP6_ADDR_BLOCK8(&(ip6hdr->src))));
960 LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
961 LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" | (dest)\n",
962 IP6_ADDR_BLOCK1(&(ip6hdr->dest)),
963 IP6_ADDR_BLOCK2(&(ip6hdr->dest)),
964 IP6_ADDR_BLOCK3(&(ip6hdr->dest)),
965 IP6_ADDR_BLOCK4(&(ip6hdr->dest))));
966 LWIP_DEBUGF(IP6_DEBUG, ("| %4"X32_F" | %4"X32_F" | %4"X32_F" | %4"X32_F" |\n",
967 IP6_ADDR_BLOCK5(&(ip6hdr->dest)),
968 IP6_ADDR_BLOCK6(&(ip6hdr->dest)),
969 IP6_ADDR_BLOCK7(&(ip6hdr->dest)),
970 IP6_ADDR_BLOCK8(&(ip6hdr->dest))));
971 LWIP_DEBUGF(IP6_DEBUG, ("+-------------------------------+\n"));
973 #endif /* IP6_DEBUG */
975 #endif /* LWIP_IPV6 */