1 /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.6 2003/01/23 21:06:47 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/nd6_nbr.c,v 1.18 2006/12/22 23:57:53 swildner Exp $ */
3 /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 #include "opt_inet6.h"
36 #include "opt_ipsec.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
45 #include <sys/kernel.h>
46 #include <sys/errno.h>
47 #include <sys/syslog.h>
48 #include <sys/queue.h>
49 #include <sys/callout.h>
50 #include <sys/thread2.h>
53 #include <net/if_types.h>
54 #include <net/if_dl.h>
55 #include <net/route.h>
57 #include <netinet/in.h>
58 #include <netinet/in_var.h>
59 #include <netinet6/in6_var.h>
60 #include <netinet/ip6.h>
61 #include <netinet6/ip6_var.h>
62 #include <netinet6/nd6.h>
63 #include <netinet/icmp6.h>
66 #include <netinet6/ipsec.h>
68 #include <netinet6/ipsec6.h>
72 #include <net/net_osdep.h>
74 #define SDL(s) ((struct sockaddr_dl *)s)
77 static struct dadq *nd6_dad_find (struct ifaddr *);
78 static void nd6_dad_starttimer (struct dadq *, int);
79 static void nd6_dad_stoptimer (struct dadq *);
80 static void nd6_dad_timer (struct ifaddr *);
81 static void nd6_dad_ns_output (struct dadq *, struct ifaddr *);
82 static void nd6_dad_ns_input (struct ifaddr *);
83 static void nd6_dad_na_input (struct ifaddr *);
85 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
86 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
89 * Input an Neighbor Solicitation Message.
92 * Based on RFC 2462 (duplicated address detection)
95 nd6_ns_input(struct mbuf *m, int off, int 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 = rtpurelookup((struct sockaddr *)&tsin6);
217 if (rt != NULL && (rt->rt_flags & RTF_ANNOUNCE) &&
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 = kin6addr_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(struct ifnet *ifp, const struct in6_addr *daddr6,
336 const struct in6_addr *taddr6,
337 struct llinfo_nd6 *ln, /* for source address determination */
338 int dad) /* duplicated address detection */
342 struct nd_neighbor_solicit *nd_ns;
343 struct in6_ifaddr *ia = NULL;
344 struct ip6_moptions im6o;
348 struct ifnet *outif = NULL;
350 if (IN6_IS_ADDR_MULTICAST(taddr6))
353 /* estimate the size of message */
354 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
355 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
356 if (max_linkhdr + maxlen >= MCLBYTES) {
358 kprintf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
359 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
364 m = m_getb(max_linkhdr + maxlen, MB_DONTWAIT, MT_DATA, M_PKTHDR);
368 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
369 m->m_flags |= M_MCAST;
370 im6o.im6o_multicast_ifp = ifp;
371 im6o.im6o_multicast_hlim = 255;
372 im6o.im6o_multicast_loop = 0;
375 icmp6len = sizeof(*nd_ns);
376 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
377 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
379 /* fill neighbor solicitation packet */
380 ip6 = mtod(m, struct ip6_hdr *);
382 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
383 ip6->ip6_vfc |= IPV6_VERSION;
384 /* ip6->ip6_plen will be set later */
385 ip6->ip6_nxt = IPPROTO_ICMPV6;
388 ip6->ip6_dst = *daddr6;
390 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
391 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
392 ip6->ip6_dst.s6_addr32[1] = 0;
393 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
394 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
395 ip6->ip6_dst.s6_addr8[12] = 0xff;
398 #if 0 /* KAME way, exact address scope match */
400 * Select a source whose scope is the same as that of the dest.
401 * Typically, the dest is link-local solicitation multicast
402 * (i.e. neighbor discovery) or link-local/global unicast
403 * (i.e. neighbor un-reachability detection).
405 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
410 ip6->ip6_src = ia->ia_addr.sin6_addr;
411 #else /* spec-wise correct */
414 * "If the source address of the packet prompting the
415 * solicitation is the same as one of the addresses assigned
416 * to the outgoing interface, that address SHOULD be placed
417 * in the IP Source Address of the outgoing solicitation.
418 * Otherwise, any one of the addresses assigned to the
419 * interface should be used."
421 * We use the source address for the prompting packet
423 * - saddr6 is given from the caller (by giving "ln"), and
424 * - saddr6 belongs to the outgoing interface.
425 * Otherwise, we perform a scope-wise match.
427 struct ip6_hdr *hip6; /* hold ip6 */
428 struct in6_addr *saddr6;
430 if (ln && ln->ln_hold) {
431 hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
433 if (sizeof(*hip6) < ln->ln_hold->m_len)
434 saddr6 = &hip6->ip6_src;
439 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
440 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
442 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
447 ip6->ip6_src = ia->ia_addr.sin6_addr;
452 * Source address for DAD packet must always be IPv6
453 * unspecified address. (0::0)
455 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
457 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
458 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
459 nd_ns->nd_ns_code = 0;
460 nd_ns->nd_ns_reserved = 0;
461 nd_ns->nd_ns_target = *taddr6;
463 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target))
464 nd_ns->nd_ns_target.s6_addr16[1] = 0;
467 * Add source link-layer address option.
469 * spec implementation
471 * DAD packet MUST NOT do not add the option
472 * there's no link layer address:
473 * impossible do not add the option
474 * there's link layer address:
475 * Multicast NS MUST add one add the option
476 * Unicast NS SHOULD add one add the option
478 if (!dad && (mac = nd6_ifptomac(ifp))) {
479 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
480 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
481 /* 8 byte alignments... */
482 optlen = (optlen + 7) & ~7;
484 m->m_pkthdr.len += optlen;
487 bzero((caddr_t)nd_opt, optlen);
488 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
489 nd_opt->nd_opt_len = optlen >> 3;
490 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
493 ip6->ip6_plen = htons((u_short)icmp6len);
494 nd_ns->nd_ns_cksum = 0;
496 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
498 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL);
500 icmp6_ifstat_inc(outif, ifs6_out_msg);
501 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
503 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
507 * Neighbor advertisement input handling.
510 * Based on RFC 2462 (duplicated address detection)
512 * the following items are not implemented yet:
513 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
514 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
517 nd6_na_input(struct mbuf *m, int off, int icmp6len)
519 struct ifnet *ifp = m->m_pkthdr.rcvif;
520 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
521 struct nd_neighbor_advert *nd_na;
523 struct in6_addr saddr6 = ip6->ip6_src;
525 struct in6_addr daddr6 = ip6->ip6_dst;
526 struct in6_addr taddr6;
534 struct llinfo_nd6 *ln;
536 struct sockaddr_dl *sdl;
537 union nd_opts ndopts;
539 if (ip6->ip6_hlim != 255) {
541 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
542 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
543 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
547 #ifndef PULLDOWN_TEST
548 IP6_EXTHDR_CHECK(m, off, icmp6len,);
549 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
551 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
553 icmp6stat.icp6s_tooshort++;
557 taddr6 = nd_na->nd_na_target;
558 flags = nd_na->nd_na_flags_reserved;
559 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
560 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
561 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
563 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
564 taddr6.s6_addr16[1] = htons(ifp->if_index);
566 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
568 "nd6_na_input: invalid target address %s\n",
569 ip6_sprintf(&taddr6)));
572 if (IN6_IS_ADDR_MULTICAST(&daddr6))
575 "nd6_na_input: a solicited adv is multicasted\n"));
579 icmp6len -= sizeof(*nd_na);
580 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
581 if (nd6_options(&ndopts) < 0) {
583 "nd6_na_input: invalid ND option, ignored\n"));
584 /* nd6_options have incremented stats */
588 if (ndopts.nd_opts_tgt_lladdr) {
589 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
590 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
593 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
596 * Target address matches one of my interface address.
598 * If my address is tentative, this means that there's somebody
599 * already using the same address as mine. This indicates DAD failure.
600 * This is defined in RFC 2462.
602 * Otherwise, process as defined in RFC 2461.
605 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
606 nd6_dad_na_input(ifa);
610 /* Just for safety, maybe unnecessary. */
613 "nd6_na_input: duplicate IP6 address %s\n",
614 ip6_sprintf(&taddr6));
618 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
620 "nd6_na_input: lladdrlen mismatch for %s "
621 "(if %d, NA packet %d)\n",
622 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
627 * If no neighbor cache entry is found, NA SHOULD silently be discarded.
629 rt = nd6_lookup(&taddr6, 0, ifp);
631 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
632 ((sdl = SDL(rt->rt_gateway)) == NULL))
635 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
637 * If the link-layer has address, and no lladdr option came,
638 * discard the packet.
640 if (ifp->if_addrlen && !lladdr)
644 * Record link-layer address, and update the state.
646 sdl->sdl_alen = ifp->if_addrlen;
647 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
649 ln->ln_state = ND6_LLINFO_REACHABLE;
652 ln->ln_expire = time_second +
653 ND_IFINFO(rt->rt_ifp)->reachable;
655 ln->ln_state = ND6_LLINFO_STALE;
656 ln->ln_expire = time_second + nd6_gctimer;
658 if ((ln->ln_router = is_router) != 0) {
660 * This means a router's state has changed from
661 * non-reachable to probably reachable, and might
662 * affect the status of associated prefixes..
664 pfxlist_onlink_check();
670 * Check if the link-layer address has changed or not.
676 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
685 * This is VERY complex. Look at it with care.
687 * override solicit lladdr llchange action
692 * 0 0 y y (1) REACHABLE->STALE
693 * 0 1 n -- (2c) *->REACHABLE
694 * 0 1 y n (2b) L *->REACHABLE
695 * 0 1 y y (1) REACHABLE->STALE
698 * 1 0 y y (2a) L *->STALE
699 * 1 1 n -- (2a) *->REACHABLE
700 * 1 1 y n (2a) L *->REACHABLE
701 * 1 1 y y (2a) L *->REACHABLE
703 if (!is_override && (lladdr && llchange)) { /* (1) */
705 * If state is REACHABLE, make it STALE.
706 * no other updates should be done.
708 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
709 ln->ln_state = ND6_LLINFO_STALE;
710 ln->ln_expire = time_second + nd6_gctimer;
713 } else if (is_override /* (2a) */
714 || (!is_override && (lladdr && !llchange)) /* (2b) */
715 || !lladdr) { /* (2c) */
717 * Update link-local address, if any.
720 sdl->sdl_alen = ifp->if_addrlen;
721 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
725 * If solicited, make the state REACHABLE.
726 * If not solicited and the link-layer address was
727 * changed, make it STALE.
730 ln->ln_state = ND6_LLINFO_REACHABLE;
733 ln->ln_expire = time_second +
734 ND_IFINFO(ifp)->reachable;
737 if (lladdr && llchange) {
738 ln->ln_state = ND6_LLINFO_STALE;
739 ln->ln_expire = time_second + nd6_gctimer;
744 if (ln->ln_router && !is_router) {
746 * The peer dropped the router flag.
747 * Remove the sender from the Default Router List and
748 * update the Destination Cache entries.
750 struct nd_defrouter *dr;
751 struct in6_addr *in6;
753 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
756 * Lock to protect the default router list.
757 * XXX: this might be unnecessary, since this function
758 * is only called under the network software interrupt
759 * context. However, we keep it just for safety.
762 dr = defrouter_lookup(in6, rt->rt_ifp);
765 else if (!ip6_forwarding && ip6_accept_rtadv) {
767 * Even if the neighbor is not in the default
768 * router list, the neighbor may be used
769 * as a next hop for some destinations
770 * (e.g. redirect case). So we must
771 * call rt6_flush explicitly.
773 rt6_flush(&ip6->ip6_src, rt->rt_ifp);
777 ln->ln_router = is_router;
779 rt->rt_flags &= ~RTF_REJECT;
783 * we assume ifp is not a loopback here, so just set the 2nd
784 * argument as the 1st one.
786 nd6_output(ifp, ifp, ln->ln_hold,
787 (struct sockaddr_in6 *)rt_key(rt), rt);
796 icmp6stat.icp6s_badna++;
801 * Neighbor advertisement output handling.
805 * the following items are not implemented yet:
806 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
807 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
810 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6,
811 const struct in6_addr *taddr6, u_long flags,
812 int tlladdr, /* 1 if include target link-layer address */
813 struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */
817 struct nd_neighbor_advert *nd_na;
818 struct in6_ifaddr *ia = NULL;
819 struct ip6_moptions im6o;
823 struct ifnet *outif = NULL;
825 /* estimate the size of message */
826 maxlen = sizeof(*ip6) + sizeof(*nd_na);
827 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
828 if (max_linkhdr + maxlen >= MCLBYTES) {
830 kprintf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
831 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
836 m = m_getb(max_linkhdr + maxlen, MB_DONTWAIT, MT_DATA, M_PKTHDR);
840 if (IN6_IS_ADDR_MULTICAST(daddr6)) {
841 m->m_flags |= M_MCAST;
842 im6o.im6o_multicast_ifp = ifp;
843 im6o.im6o_multicast_hlim = 255;
844 im6o.im6o_multicast_loop = 0;
847 icmp6len = sizeof(*nd_na);
848 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
849 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
851 /* fill neighbor advertisement packet */
852 ip6 = mtod(m, struct ip6_hdr *);
854 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
855 ip6->ip6_vfc |= IPV6_VERSION;
856 ip6->ip6_nxt = IPPROTO_ICMPV6;
858 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
860 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
861 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
862 ip6->ip6_dst.s6_addr32[1] = 0;
863 ip6->ip6_dst.s6_addr32[2] = 0;
864 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
865 flags &= ~ND_NA_FLAG_SOLICITED;
867 ip6->ip6_dst = *daddr6;
870 * Select a source whose scope is the same as that of the dest.
872 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
877 ip6->ip6_src = ia->ia_addr.sin6_addr;
878 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
879 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
880 nd_na->nd_na_code = 0;
881 nd_na->nd_na_target = *taddr6;
882 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target))
883 nd_na->nd_na_target.s6_addr16[1] = 0;
886 * "tlladdr" indicates NS's condition for adding tlladdr or not.
887 * see nd6_ns_input() for details.
888 * Basically, if NS packet is sent to unicast/anycast addr,
889 * target lladdr option SHOULD NOT be included.
894 * sdl0 != NULL indicates proxy NA. If we do proxy, use
895 * lladdr in sdl0. If we are not proxying (sending NA for
896 * my address) use lladdr configured for the interface.
899 mac = nd6_ifptomac(ifp);
900 else if (sdl0->sa_family == AF_LINK) {
901 struct sockaddr_dl *sdl;
902 sdl = (struct sockaddr_dl *)sdl0;
903 if (sdl->sdl_alen == ifp->if_addrlen)
908 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
909 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
911 /* roundup to 8 bytes alignment! */
912 optlen = (optlen + 7) & ~7;
914 m->m_pkthdr.len += optlen;
917 bzero((caddr_t)nd_opt, optlen);
918 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
919 nd_opt->nd_opt_len = optlen >> 3;
920 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
922 flags &= ~ND_NA_FLAG_OVERRIDE;
924 ip6->ip6_plen = htons((u_short)icmp6len);
925 nd_na->nd_na_flags_reserved = flags;
926 nd_na->nd_na_cksum = 0;
928 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
930 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL);
932 icmp6_ifstat_inc(outif, ifs6_out_msg);
933 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
935 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
939 nd6_ifptomac(struct ifnet *ifp)
941 switch (ifp->if_type) {
952 return ((caddr_t)(ifp + 1));
959 TAILQ_HEAD(dadq_head, dadq);
961 TAILQ_ENTRY(dadq) dad_list;
962 struct ifaddr *dad_ifa;
963 int dad_count; /* max NS to send */
964 int dad_ns_tcount; /* # of trials to send NS */
965 int dad_ns_ocount; /* NS sent so far */
968 struct callout dad_timer_ch;
971 static struct dadq_head dadq;
972 static int dad_init = 0;
975 nd6_dad_find(struct ifaddr *ifa)
979 TAILQ_FOREACH(dp, &dadq, dad_list) {
980 if (dp->dad_ifa == ifa)
987 nd6_dad_starttimer(struct dadq *dp, int ticks)
990 callout_reset(&dp->dad_timer_ch, ticks,
991 (void (*) (void *))nd6_dad_timer, (void *)dp->dad_ifa);
995 nd6_dad_stoptimer(struct dadq *dp)
998 callout_stop(&dp->dad_timer_ch);
1002 * Start Duplicated Address Detection (DAD) for specified interface address.
1005 nd6_dad_start(struct ifaddr *ifa,
1006 int *tick) /* minimum delay ticks for IFF_UP event */
1008 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1017 * If we don't need DAD, don't do it.
1018 * There are several cases:
1019 * - DAD is disabled (ip6_dad_count == 0)
1020 * - the interface address is anycast
1022 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1024 "nd6_dad_start: called with non-tentative address "
1026 ip6_sprintf(&ia->ia_addr.sin6_addr),
1027 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1030 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1031 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1034 if (!ip6_dad_count) {
1035 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1039 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1040 if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1042 if (nd6_dad_find(ifa) != NULL) {
1043 /* DAD already in progress */
1047 dp = kmalloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1049 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1051 ip6_sprintf(&ia->ia_addr.sin6_addr),
1052 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1055 bzero(dp, sizeof(*dp));
1056 callout_init(&dp->dad_timer_ch);
1057 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
1059 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1060 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1063 * Send NS packet for DAD, ip6_dad_count times.
1064 * Note that we must delay the first transmission, if this is the
1065 * first packet to be sent from the interface after interface
1066 * (re)initialization.
1069 IFAREF(ifa); /* just for safety */
1070 dp->dad_count = ip6_dad_count;
1071 dp->dad_ns_icount = dp->dad_na_icount = 0;
1072 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1074 nd6_dad_ns_output(dp, ifa);
1075 nd6_dad_starttimer(dp,
1076 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1081 ntick = krandom() % (MAX_RTR_SOLICITATION_DELAY * hz);
1083 ntick = *tick + krandom() % (hz / 2);
1085 nd6_dad_starttimer(dp, ntick);
1090 * terminate DAD unconditionally. used for address removals.
1093 nd6_dad_stop(struct ifaddr *ifa)
1099 dp = nd6_dad_find(ifa);
1101 /* DAD wasn't started yet */
1105 nd6_dad_stoptimer(dp);
1107 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1108 kfree(dp, M_IP6NDP);
1114 nd6_dad_timer(struct ifaddr *ifa)
1116 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1119 crit_enter(); /* XXX */
1123 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1126 dp = nd6_dad_find(ifa);
1128 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
1131 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1132 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1134 ip6_sprintf(&ia->ia_addr.sin6_addr),
1135 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1138 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1139 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1141 ip6_sprintf(&ia->ia_addr.sin6_addr),
1142 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1146 /* timeouted with IFF_{RUNNING,UP} check */
1147 if (dp->dad_ns_tcount > dad_maxtry) {
1148 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1149 if_name(ifa->ifa_ifp)));
1151 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1152 kfree(dp, M_IP6NDP);
1158 /* Need more checks? */
1159 if (dp->dad_ns_ocount < dp->dad_count) {
1161 * We have more NS to go. Send NS packet for DAD.
1163 nd6_dad_ns_output(dp, ifa);
1164 nd6_dad_starttimer(dp,
1165 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1168 * We have transmitted sufficient number of DAD packets.
1169 * See what we've got.
1175 if (dp->dad_na_icount) {
1177 * the check is in nd6_dad_na_input(),
1183 if (dp->dad_ns_icount) {
1184 #if 0 /* heuristics */
1187 * - we have sent many(?) DAD NS, and
1188 * - the number of NS we sent equals to the
1189 * number of NS we've got, and
1191 * we may have a faulty network card/driver which
1192 * loops back multicasts to myself.
1194 if (3 < dp->dad_count
1195 && dp->dad_ns_icount == dp->dad_count
1196 && dp->dad_na_icount == 0) {
1197 log(LOG_INFO, "DAD questionable for %s(%s): "
1198 "network card loops back multicast?\n",
1199 ip6_sprintf(&ia->ia_addr.sin6_addr),
1200 if_name(ifa->ifa_ifp));
1201 /* XXX consider it a duplicate or not? */
1204 /* We've seen NS, means DAD has failed. */
1208 /* We've seen NS, means DAD has failed. */
1214 /* (*dp) will be freed in nd6_dad_duplicated() */
1216 nd6_dad_duplicated(ifa);
1219 * We are done with DAD. No NA came, no NS came.
1220 * duplicated address found.
1222 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1225 "%s: DAD complete for %s - no duplicates found\n",
1226 if_name(ifa->ifa_ifp),
1227 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1229 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1230 kfree(dp, M_IP6NDP);
1241 nd6_dad_duplicated(struct ifaddr *ifa)
1243 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1246 dp = nd6_dad_find(ifa);
1248 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1252 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1253 "NS in/out=%d/%d, NA in=%d\n",
1254 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
1255 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1257 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1258 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1260 /* We are done with DAD, with duplicated address found. (failure) */
1261 nd6_dad_stoptimer(dp);
1263 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1264 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
1265 log(LOG_ERR, "%s: manual intervention required\n",
1266 if_name(ifa->ifa_ifp));
1268 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1269 kfree(dp, M_IP6NDP);
1275 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1277 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1278 struct ifnet *ifp = ifa->ifa_ifp;
1280 dp->dad_ns_tcount++;
1281 if (!(ifp->if_flags & IFF_UP)) {
1283 kprintf("%s: interface down?\n", if_name(ifp));
1287 if (!(ifp->if_flags & IFF_RUNNING)) {
1289 kprintf("%s: interface not running?\n", if_name(ifp));
1294 dp->dad_ns_ocount++;
1295 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1299 nd6_dad_ns_input(struct ifaddr *ifa)
1301 struct in6_ifaddr *ia;
1303 const struct in6_addr *taddr6;
1308 panic("ifa == NULL in nd6_dad_ns_input");
1310 ia = (struct in6_ifaddr *)ifa;
1312 taddr6 = &ia->ia_addr.sin6_addr;
1314 dp = nd6_dad_find(ifa);
1316 /* Quickhack - completely ignore DAD NS packets */
1317 if (dad_ignore_ns) {
1319 "nd6_dad_ns_input: ignoring DAD NS packet for "
1320 "address %s(%s)\n", ip6_sprintf(taddr6),
1321 if_name(ifa->ifa_ifp)));
1326 * if I'm yet to start DAD, someone else started using this address
1327 * first. I have a duplicate and you win.
1329 if (!dp || dp->dad_ns_ocount == 0)
1332 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1335 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1336 nd6_dad_duplicated(ifa);
1339 * not sure if I got a duplicate.
1340 * increment ns count and see what happens.
1343 dp->dad_ns_icount++;
1348 nd6_dad_na_input(struct ifaddr *ifa)
1353 panic("ifa == NULL in nd6_dad_na_input");
1355 dp = nd6_dad_find(ifa);
1357 dp->dad_na_icount++;
1359 /* remove the address. */
1360 nd6_dad_duplicated(ifa);