1 /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.6 2003/01/23 21:06:47 sam Exp $ */
2 /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opt_inet6.h"
35 #include "opt_ipsec.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
44 #include <sys/kernel.h>
45 #include <sys/errno.h>
46 #include <sys/syslog.h>
47 #include <sys/queue.h>
48 #include <sys/callout.h>
51 #include <net/if_types.h>
52 #include <net/if_dl.h>
53 #include <net/route.h>
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet6/in6_var.h>
58 #include <netinet/ip6.h>
59 #include <netinet6/ip6_var.h>
60 #include <netinet6/nd6.h>
61 #include <netinet/icmp6.h>
64 #include <netinet6/ipsec.h>
66 #include <netinet6/ipsec6.h>
70 #include <net/net_osdep.h>
72 #define SDL(s) ((struct sockaddr_dl *)s)
75 static struct dadq *nd6_dad_find __P((struct ifaddr *));
76 static void nd6_dad_starttimer __P((struct dadq *, int));
77 static void nd6_dad_stoptimer __P((struct dadq *));
78 static void nd6_dad_timer __P((struct ifaddr *));
79 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *));
80 static void nd6_dad_ns_input __P((struct ifaddr *));
81 static void nd6_dad_na_input __P((struct ifaddr *));
83 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
84 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
87 * Input an Neighbor Solicitation Message.
90 * Based on RFC 2462 (duplicated address detection)
93 nd6_ns_input(m, off, icmp6len)
97 struct ifnet *ifp = m->m_pkthdr.rcvif;
98 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
99 struct nd_neighbor_solicit *nd_ns;
100 struct in6_addr saddr6 = ip6->ip6_src;
101 struct in6_addr daddr6 = ip6->ip6_dst;
102 struct in6_addr taddr6;
103 struct in6_addr myaddr6;
107 int anycast = 0, proxy = 0, tentative = 0;
109 union nd_opts ndopts;
110 struct sockaddr_dl *proxydl = NULL;
112 #ifndef PULLDOWN_TEST
113 IP6_EXTHDR_CHECK(m, off, icmp6len,);
114 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
116 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
118 icmp6stat.icp6s_tooshort++;
122 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
123 taddr6 = nd_ns->nd_ns_target;
125 if (ip6->ip6_hlim != 255) {
127 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
128 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
129 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
133 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
134 /* dst has to be solicited node multicast address. */
135 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL
136 /* don't check ifindex portion */
137 && daddr6.s6_addr32[1] == 0
138 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE
139 && daddr6.s6_addr8[12] == 0xff) {
142 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
143 "(wrong ip6 dst)\n"));
148 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
149 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
153 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
154 taddr6.s6_addr16[1] = htons(ifp->if_index);
156 icmp6len -= sizeof(*nd_ns);
157 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
158 if (nd6_options(&ndopts) < 0) {
160 "nd6_ns_input: invalid ND option, ignored\n"));
161 /* nd6_options have incremented stats */
165 if (ndopts.nd_opts_src_lladdr) {
166 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
167 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
170 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
171 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
172 "(link-layer address option)\n"));
177 * Attaching target link-layer address to the NA?
180 * NS IP dst is unicast/anycast MUST NOT add
181 * NS IP dst is solicited-node multicast MUST add
183 * In implementation, we add target link-layer address by default.
184 * We do not add one in MUST NOT cases.
186 #if 0 /* too much! */
187 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
188 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
192 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
198 * Target address (taddr6) must be either:
199 * (1) Valid unicast/anycast address for my receiving interface,
200 * (2) Unicast address for which I'm offering proxy service, or
201 * (3) "tentative" address on which DAD is being performed.
203 /* (1) and (3) check. */
204 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
209 struct sockaddr_in6 tsin6;
211 bzero(&tsin6, sizeof tsin6);
212 tsin6.sin6_len = sizeof(struct sockaddr_in6);
213 tsin6.sin6_family = AF_INET6;
214 tsin6.sin6_addr = taddr6;
216 rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0);
217 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
218 rt->rt_gateway->sa_family == AF_LINK) {
220 * proxy NDP for single entry
222 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
223 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
226 proxydl = SDL(rt->rt_gateway);
234 * We've got an NS packet, and we don't have that adddress
235 * assigned for us. We MUST silently ignore it.
240 myaddr6 = *IFA_IN6(ifa);
241 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
242 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
243 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
246 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
248 "nd6_ns_input: lladdrlen mismatch for %s "
249 "(if %d, NS packet %d)\n",
250 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
254 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
256 "nd6_ns_input: duplicate IP6 address %s\n",
257 ip6_sprintf(&saddr6)));
262 * We have neighbor solicitation packet, with target address equals to
263 * one of my tentative address.
265 * src addr how to process?
267 * multicast of course, invalid (rejected in ip6_input)
268 * unicast somebody is doing address resolution -> ignore
269 * unspec dup address detection
271 * The processing is defined in RFC 2462.
275 * If source address is unspecified address, it is for
276 * duplicated address detection.
278 * If not, the packet is for addess resolution;
279 * silently ignore it.
281 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
282 nd6_dad_ns_input(ifa);
288 * If the source address is unspecified address, entries must not
289 * be created or updated.
290 * It looks that sender is performing DAD. Output NA toward
291 * all-node multicast address, to tell the sender that I'm using
293 * S bit ("solicited") must be zero.
295 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
296 saddr6 = in6addr_linklocal_allnodes;
297 saddr6.s6_addr16[1] = htons(ifp->if_index);
298 nd6_na_output(ifp, &saddr6, &taddr6,
299 ((anycast || proxy || !tlladdr)
300 ? 0 : ND_NA_FLAG_OVERRIDE)
301 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
302 tlladdr, (struct sockaddr *)proxydl);
306 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
308 nd6_na_output(ifp, &saddr6, &taddr6,
309 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE)
310 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
311 | ND_NA_FLAG_SOLICITED,
312 tlladdr, (struct sockaddr *)proxydl);
318 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
319 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
320 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
321 icmp6stat.icp6s_badns++;
326 * Output an Neighbor Solicitation Message. Caller specifies:
327 * - ICMP6 header source IP6 address
328 * - ND6 header target IP6 address
329 * - ND6 header source datalink address
332 * Based on RFC 2462 (duplicated address detection)
335 nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
337 const struct in6_addr *daddr6, *taddr6;
338 struct llinfo_nd6 *ln; /* for source address determination */
339 int dad; /* duplicated address detection */
343 struct nd_neighbor_solicit *nd_ns;
344 struct in6_ifaddr *ia = NULL;
345 struct ip6_moptions im6o;
349 struct ifnet *outif = NULL;
351 if (IN6_IS_ADDR_MULTICAST(taddr6))
354 /* estimate the size of message */
355 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
356 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
357 if (max_linkhdr + maxlen >= MCLBYTES) {
359 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
360 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
365 MGETHDR(m, M_DONTWAIT, MT_DATA);
366 if (m && max_linkhdr + maxlen >= MHLEN) {
367 MCLGET(m, M_DONTWAIT);
368 if ((m->m_flags & M_EXT) == 0) {
375 m->m_pkthdr.rcvif = NULL;
377 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
378 m->m_flags |= M_MCAST;
379 im6o.im6o_multicast_ifp = ifp;
380 im6o.im6o_multicast_hlim = 255;
381 im6o.im6o_multicast_loop = 0;
384 icmp6len = sizeof(*nd_ns);
385 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
386 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
388 /* fill neighbor solicitation packet */
389 ip6 = mtod(m, struct ip6_hdr *);
391 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
392 ip6->ip6_vfc |= IPV6_VERSION;
393 /* ip6->ip6_plen will be set later */
394 ip6->ip6_nxt = IPPROTO_ICMPV6;
397 ip6->ip6_dst = *daddr6;
399 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
400 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
401 ip6->ip6_dst.s6_addr32[1] = 0;
402 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
403 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
404 ip6->ip6_dst.s6_addr8[12] = 0xff;
407 #if 0 /* KAME way, exact address scope match */
409 * Select a source whose scope is the same as that of the dest.
410 * Typically, the dest is link-local solicitation multicast
411 * (i.e. neighbor discovery) or link-local/global unicast
412 * (i.e. neighbor un-reachability detection).
414 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
419 ip6->ip6_src = ia->ia_addr.sin6_addr;
420 #else /* spec-wise correct */
423 * "If the source address of the packet prompting the
424 * solicitation is the same as one of the addresses assigned
425 * to the outgoing interface, that address SHOULD be placed
426 * in the IP Source Address of the outgoing solicitation.
427 * Otherwise, any one of the addresses assigned to the
428 * interface should be used."
430 * We use the source address for the prompting packet
432 * - saddr6 is given from the caller (by giving "ln"), and
433 * - saddr6 belongs to the outgoing interface.
434 * Otherwise, we perform a scope-wise match.
436 struct ip6_hdr *hip6; /* hold ip6 */
437 struct in6_addr *saddr6;
439 if (ln && ln->ln_hold) {
440 hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
442 if (sizeof(*hip6) < ln->ln_hold->m_len)
443 saddr6 = &hip6->ip6_src;
448 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
449 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
451 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
456 ip6->ip6_src = ia->ia_addr.sin6_addr;
461 * Source address for DAD packet must always be IPv6
462 * unspecified address. (0::0)
464 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
466 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
467 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
468 nd_ns->nd_ns_code = 0;
469 nd_ns->nd_ns_reserved = 0;
470 nd_ns->nd_ns_target = *taddr6;
472 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target))
473 nd_ns->nd_ns_target.s6_addr16[1] = 0;
476 * Add source link-layer address option.
478 * spec implementation
480 * DAD packet MUST NOT do not add the option
481 * there's no link layer address:
482 * impossible do not add the option
483 * there's link layer address:
484 * Multicast NS MUST add one add the option
485 * Unicast NS SHOULD add one add the option
487 if (!dad && (mac = nd6_ifptomac(ifp))) {
488 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
489 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
490 /* 8 byte alignments... */
491 optlen = (optlen + 7) & ~7;
493 m->m_pkthdr.len += optlen;
496 bzero((caddr_t)nd_opt, optlen);
497 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
498 nd_opt->nd_opt_len = optlen >> 3;
499 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
502 ip6->ip6_plen = htons((u_short)icmp6len);
503 nd_ns->nd_ns_cksum = 0;
505 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
507 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL);
509 icmp6_ifstat_inc(outif, ifs6_out_msg);
510 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
512 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
516 * Neighbor advertisement input handling.
519 * Based on RFC 2462 (duplicated address detection)
521 * the following items are not implemented yet:
522 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
523 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
526 nd6_na_input(m, off, icmp6len)
530 struct ifnet *ifp = m->m_pkthdr.rcvif;
531 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
532 struct nd_neighbor_advert *nd_na;
534 struct in6_addr saddr6 = ip6->ip6_src;
536 struct in6_addr daddr6 = ip6->ip6_dst;
537 struct in6_addr taddr6;
545 struct llinfo_nd6 *ln;
547 struct sockaddr_dl *sdl;
548 union nd_opts ndopts;
550 if (ip6->ip6_hlim != 255) {
552 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
553 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
554 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
558 #ifndef PULLDOWN_TEST
559 IP6_EXTHDR_CHECK(m, off, icmp6len,);
560 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
562 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
564 icmp6stat.icp6s_tooshort++;
568 taddr6 = nd_na->nd_na_target;
569 flags = nd_na->nd_na_flags_reserved;
570 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
571 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
572 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
574 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
575 taddr6.s6_addr16[1] = htons(ifp->if_index);
577 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
579 "nd6_na_input: invalid target address %s\n",
580 ip6_sprintf(&taddr6)));
583 if (IN6_IS_ADDR_MULTICAST(&daddr6))
586 "nd6_na_input: a solicited adv is multicasted\n"));
590 icmp6len -= sizeof(*nd_na);
591 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
592 if (nd6_options(&ndopts) < 0) {
594 "nd6_na_input: invalid ND option, ignored\n"));
595 /* nd6_options have incremented stats */
599 if (ndopts.nd_opts_tgt_lladdr) {
600 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
601 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
604 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
607 * Target address matches one of my interface address.
609 * If my address is tentative, this means that there's somebody
610 * already using the same address as mine. This indicates DAD failure.
611 * This is defined in RFC 2462.
613 * Otherwise, process as defined in RFC 2461.
616 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
617 nd6_dad_na_input(ifa);
621 /* Just for safety, maybe unnecessary. */
624 "nd6_na_input: duplicate IP6 address %s\n",
625 ip6_sprintf(&taddr6));
629 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
631 "nd6_na_input: lladdrlen mismatch for %s "
632 "(if %d, NA packet %d)\n",
633 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
638 * If no neighbor cache entry is found, NA SHOULD silently be discarded.
640 rt = nd6_lookup(&taddr6, 0, ifp);
642 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
643 ((sdl = SDL(rt->rt_gateway)) == NULL))
646 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
648 * If the link-layer has address, and no lladdr option came,
649 * discard the packet.
651 if (ifp->if_addrlen && !lladdr)
655 * Record link-layer address, and update the state.
657 sdl->sdl_alen = ifp->if_addrlen;
658 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
660 ln->ln_state = ND6_LLINFO_REACHABLE;
663 ln->ln_expire = time_second +
664 nd_ifinfo[rt->rt_ifp->if_index].reachable;
666 ln->ln_state = ND6_LLINFO_STALE;
667 ln->ln_expire = time_second + nd6_gctimer;
669 if ((ln->ln_router = is_router) != 0) {
671 * This means a router's state has changed from
672 * non-reachable to probably reachable, and might
673 * affect the status of associated prefixes..
675 pfxlist_onlink_check();
681 * Check if the link-layer address has changed or not.
687 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
696 * This is VERY complex. Look at it with care.
698 * override solicit lladdr llchange action
703 * 0 0 y y (1) REACHABLE->STALE
704 * 0 1 n -- (2c) *->REACHABLE
705 * 0 1 y n (2b) L *->REACHABLE
706 * 0 1 y y (1) REACHABLE->STALE
709 * 1 0 y y (2a) L *->STALE
710 * 1 1 n -- (2a) *->REACHABLE
711 * 1 1 y n (2a) L *->REACHABLE
712 * 1 1 y y (2a) L *->REACHABLE
714 if (!is_override && (lladdr && llchange)) { /* (1) */
716 * If state is REACHABLE, make it STALE.
717 * no other updates should be done.
719 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
720 ln->ln_state = ND6_LLINFO_STALE;
721 ln->ln_expire = time_second + nd6_gctimer;
724 } else if (is_override /* (2a) */
725 || (!is_override && (lladdr && !llchange)) /* (2b) */
726 || !lladdr) { /* (2c) */
728 * Update link-local address, if any.
731 sdl->sdl_alen = ifp->if_addrlen;
732 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
736 * If solicited, make the state REACHABLE.
737 * If not solicited and the link-layer address was
738 * changed, make it STALE.
741 ln->ln_state = ND6_LLINFO_REACHABLE;
744 ln->ln_expire = time_second +
745 nd_ifinfo[ifp->if_index].reachable;
748 if (lladdr && llchange) {
749 ln->ln_state = ND6_LLINFO_STALE;
750 ln->ln_expire = time_second + nd6_gctimer;
755 if (ln->ln_router && !is_router) {
757 * The peer dropped the router flag.
758 * Remove the sender from the Default Router List and
759 * update the Destination Cache entries.
761 struct nd_defrouter *dr;
762 struct in6_addr *in6;
765 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
768 * Lock to protect the default router list.
769 * XXX: this might be unnecessary, since this function
770 * is only called under the network software interrupt
771 * context. However, we keep it just for safety.
774 dr = defrouter_lookup(in6, rt->rt_ifp);
777 else if (!ip6_forwarding && ip6_accept_rtadv) {
779 * Even if the neighbor is not in the default
780 * router list, the neighbor may be used
781 * as a next hop for some destinations
782 * (e.g. redirect case). So we must
783 * call rt6_flush explicitly.
785 rt6_flush(&ip6->ip6_src, rt->rt_ifp);
789 ln->ln_router = is_router;
791 rt->rt_flags &= ~RTF_REJECT;
795 * we assume ifp is not a loopback here, so just set the 2nd
796 * argument as the 1st one.
798 nd6_output(ifp, ifp, ln->ln_hold,
799 (struct sockaddr_in6 *)rt_key(rt), rt);
808 icmp6stat.icp6s_badna++;
813 * Neighbor advertisement output handling.
817 * the following items are not implemented yet:
818 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
819 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
822 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0)
824 const struct in6_addr *daddr6, *taddr6;
826 int tlladdr; /* 1 if include target link-layer address */
827 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */
831 struct nd_neighbor_advert *nd_na;
832 struct in6_ifaddr *ia = NULL;
833 struct ip6_moptions im6o;
837 struct ifnet *outif = NULL;
839 /* estimate the size of message */
840 maxlen = sizeof(*ip6) + sizeof(*nd_na);
841 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
842 if (max_linkhdr + maxlen >= MCLBYTES) {
844 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
845 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
850 MGETHDR(m, M_DONTWAIT, MT_DATA);
851 if (m && max_linkhdr + maxlen >= MHLEN) {
852 MCLGET(m, M_DONTWAIT);
853 if ((m->m_flags & M_EXT) == 0) {
860 m->m_pkthdr.rcvif = NULL;
862 if (IN6_IS_ADDR_MULTICAST(daddr6)) {
863 m->m_flags |= M_MCAST;
864 im6o.im6o_multicast_ifp = ifp;
865 im6o.im6o_multicast_hlim = 255;
866 im6o.im6o_multicast_loop = 0;
869 icmp6len = sizeof(*nd_na);
870 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
871 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
873 /* fill neighbor advertisement packet */
874 ip6 = mtod(m, struct ip6_hdr *);
876 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
877 ip6->ip6_vfc |= IPV6_VERSION;
878 ip6->ip6_nxt = IPPROTO_ICMPV6;
880 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
882 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
883 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
884 ip6->ip6_dst.s6_addr32[1] = 0;
885 ip6->ip6_dst.s6_addr32[2] = 0;
886 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
887 flags &= ~ND_NA_FLAG_SOLICITED;
889 ip6->ip6_dst = *daddr6;
892 * Select a source whose scope is the same as that of the dest.
894 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
899 ip6->ip6_src = ia->ia_addr.sin6_addr;
900 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
901 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
902 nd_na->nd_na_code = 0;
903 nd_na->nd_na_target = *taddr6;
904 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target))
905 nd_na->nd_na_target.s6_addr16[1] = 0;
908 * "tlladdr" indicates NS's condition for adding tlladdr or not.
909 * see nd6_ns_input() for details.
910 * Basically, if NS packet is sent to unicast/anycast addr,
911 * target lladdr option SHOULD NOT be included.
916 * sdl0 != NULL indicates proxy NA. If we do proxy, use
917 * lladdr in sdl0. If we are not proxying (sending NA for
918 * my address) use lladdr configured for the interface.
921 mac = nd6_ifptomac(ifp);
922 else if (sdl0->sa_family == AF_LINK) {
923 struct sockaddr_dl *sdl;
924 sdl = (struct sockaddr_dl *)sdl0;
925 if (sdl->sdl_alen == ifp->if_addrlen)
929 if (tlladdr && mac) {
930 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
931 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
933 /* roundup to 8 bytes alignment! */
934 optlen = (optlen + 7) & ~7;
936 m->m_pkthdr.len += optlen;
939 bzero((caddr_t)nd_opt, optlen);
940 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
941 nd_opt->nd_opt_len = optlen >> 3;
942 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
944 flags &= ~ND_NA_FLAG_OVERRIDE;
946 ip6->ip6_plen = htons((u_short)icmp6len);
947 nd_na->nd_na_flags_reserved = flags;
948 nd_na->nd_na_cksum = 0;
950 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
952 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL);
954 icmp6_ifstat_inc(outif, ifs6_out_msg);
955 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
957 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
964 switch (ifp->if_type) {
975 return ((caddr_t)(ifp + 1));
982 TAILQ_HEAD(dadq_head, dadq);
984 TAILQ_ENTRY(dadq) dad_list;
985 struct ifaddr *dad_ifa;
986 int dad_count; /* max NS to send */
987 int dad_ns_tcount; /* # of trials to send NS */
988 int dad_ns_ocount; /* NS sent so far */
991 struct callout dad_timer_ch;
994 static struct dadq_head dadq;
995 static int dad_init = 0;
1003 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
1004 if (dp->dad_ifa == ifa)
1011 nd6_dad_starttimer(dp, ticks)
1016 callout_reset(&dp->dad_timer_ch, ticks,
1017 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa);
1021 nd6_dad_stoptimer(dp)
1025 callout_stop(&dp->dad_timer_ch);
1029 * Start Duplicated Address Detection (DAD) for specified interface address.
1032 nd6_dad_start(ifa, tick)
1034 int *tick; /* minimum delay ticks for IFF_UP event */
1036 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1045 * If we don't need DAD, don't do it.
1046 * There are several cases:
1047 * - DAD is disabled (ip6_dad_count == 0)
1048 * - the interface address is anycast
1050 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1052 "nd6_dad_start: called with non-tentative address "
1054 ip6_sprintf(&ia->ia_addr.sin6_addr),
1055 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1058 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1059 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1062 if (!ip6_dad_count) {
1063 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1067 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1068 if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1070 if (nd6_dad_find(ifa) != NULL) {
1071 /* DAD already in progress */
1075 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1077 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1079 ip6_sprintf(&ia->ia_addr.sin6_addr),
1080 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1083 bzero(dp, sizeof(*dp));
1084 callout_init(&dp->dad_timer_ch);
1085 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
1087 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1088 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1091 * Send NS packet for DAD, ip6_dad_count times.
1092 * Note that we must delay the first transmission, if this is the
1093 * first packet to be sent from the interface after interface
1094 * (re)initialization.
1097 IFAREF(ifa); /* just for safety */
1098 dp->dad_count = ip6_dad_count;
1099 dp->dad_ns_icount = dp->dad_na_icount = 0;
1100 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1102 nd6_dad_ns_output(dp, ifa);
1103 nd6_dad_starttimer(dp,
1104 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
1109 ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz);
1111 ntick = *tick + random() % (hz / 2);
1113 nd6_dad_starttimer(dp, ntick);
1118 * terminate DAD unconditionally. used for address removals.
1128 dp = nd6_dad_find(ifa);
1130 /* DAD wasn't started yet */
1134 nd6_dad_stoptimer(dp);
1136 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1147 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1150 s = splnet(); /* XXX */
1154 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1157 dp = nd6_dad_find(ifa);
1159 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
1162 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1163 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1165 ip6_sprintf(&ia->ia_addr.sin6_addr),
1166 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1169 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1170 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1172 ip6_sprintf(&ia->ia_addr.sin6_addr),
1173 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1177 /* timeouted with IFF_{RUNNING,UP} check */
1178 if (dp->dad_ns_tcount > dad_maxtry) {
1179 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1180 if_name(ifa->ifa_ifp)));
1182 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1189 /* Need more checks? */
1190 if (dp->dad_ns_ocount < dp->dad_count) {
1192 * We have more NS to go. Send NS packet for DAD.
1194 nd6_dad_ns_output(dp, ifa);
1195 nd6_dad_starttimer(dp,
1196 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
1199 * We have transmitted sufficient number of DAD packets.
1200 * See what we've got.
1206 if (dp->dad_na_icount) {
1208 * the check is in nd6_dad_na_input(),
1214 if (dp->dad_ns_icount) {
1215 #if 0 /* heuristics */
1218 * - we have sent many(?) DAD NS, and
1219 * - the number of NS we sent equals to the
1220 * number of NS we've got, and
1222 * we may have a faulty network card/driver which
1223 * loops back multicasts to myself.
1225 if (3 < dp->dad_count
1226 && dp->dad_ns_icount == dp->dad_count
1227 && dp->dad_na_icount == 0) {
1228 log(LOG_INFO, "DAD questionable for %s(%s): "
1229 "network card loops back multicast?\n",
1230 ip6_sprintf(&ia->ia_addr.sin6_addr),
1231 if_name(ifa->ifa_ifp));
1232 /* XXX consider it a duplicate or not? */
1235 /* We've seen NS, means DAD has failed. */
1239 /* We've seen NS, means DAD has failed. */
1245 /* (*dp) will be freed in nd6_dad_duplicated() */
1247 nd6_dad_duplicated(ifa);
1250 * We are done with DAD. No NA came, no NS came.
1251 * duplicated address found.
1253 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1256 "%s: DAD complete for %s - no duplicates found\n",
1257 if_name(ifa->ifa_ifp),
1258 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1260 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1272 nd6_dad_duplicated(ifa)
1275 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1278 dp = nd6_dad_find(ifa);
1280 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1284 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1285 "NS in/out=%d/%d, NA in=%d\n",
1286 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
1287 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1289 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1290 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1292 /* We are done with DAD, with duplicated address found. (failure) */
1293 nd6_dad_stoptimer(dp);
1295 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1296 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
1297 log(LOG_ERR, "%s: manual intervention required\n",
1298 if_name(ifa->ifa_ifp));
1300 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1307 nd6_dad_ns_output(dp, ifa)
1311 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1312 struct ifnet *ifp = ifa->ifa_ifp;
1314 dp->dad_ns_tcount++;
1315 if ((ifp->if_flags & IFF_UP) == 0) {
1317 printf("%s: interface down?\n", if_name(ifp));
1321 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1323 printf("%s: interface not running?\n", if_name(ifp));
1328 dp->dad_ns_ocount++;
1329 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1333 nd6_dad_ns_input(ifa)
1336 struct in6_ifaddr *ia;
1338 const struct in6_addr *taddr6;
1343 panic("ifa == NULL in nd6_dad_ns_input");
1345 ia = (struct in6_ifaddr *)ifa;
1347 taddr6 = &ia->ia_addr.sin6_addr;
1349 dp = nd6_dad_find(ifa);
1351 /* Quickhack - completely ignore DAD NS packets */
1352 if (dad_ignore_ns) {
1354 "nd6_dad_ns_input: ignoring DAD NS packet for "
1355 "address %s(%s)\n", ip6_sprintf(taddr6),
1356 if_name(ifa->ifa_ifp)));
1361 * if I'm yet to start DAD, someone else started using this address
1362 * first. I have a duplicate and you win.
1364 if (!dp || dp->dad_ns_ocount == 0)
1367 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1370 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1371 nd6_dad_duplicated(ifa);
1374 * not sure if I got a duplicate.
1375 * increment ns count and see what happens.
1378 dp->dad_ns_icount++;
1383 nd6_dad_na_input(ifa)
1389 panic("ifa == NULL in nd6_dad_na_input");
1391 dp = nd6_dad_find(ifa);
1393 dp->dad_na_icount++;
1395 /* remove the address. */
1396 nd6_dad_duplicated(ifa);