2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
37 #include "opt_ipsec.h"
38 #include "opt_mpath.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/malloc.h>
44 #include <sys/rwlock.h>
46 #include <sys/socket.h>
47 #include <sys/sockio.h>
49 #include <sys/kernel.h>
50 #include <sys/errno.h>
51 #include <sys/syslog.h>
52 #include <sys/queue.h>
53 #include <sys/callout.h>
56 #include <net/if_types.h>
57 #include <net/if_dl.h>
58 #include <net/if_var.h>
59 #include <net/route.h>
61 #include <net/radix_mpath.h>
64 #include <netinet/in.h>
65 #include <netinet/in_var.h>
66 #include <net/if_llatbl.h>
67 #define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le))
68 #include <netinet6/in6_var.h>
69 #include <netinet6/in6_ifattach.h>
70 #include <netinet/ip6.h>
71 #include <netinet6/ip6_var.h>
72 #include <netinet6/scope6_var.h>
73 #include <netinet6/nd6.h>
74 #include <netinet/icmp6.h>
75 #include <netinet/ip_carp.h>
76 #include <netinet6/send.h>
78 #define SDL(s) ((struct sockaddr_dl *)s)
81 static struct dadq *nd6_dad_find(struct ifaddr *);
82 static void nd6_dad_starttimer(struct dadq *, int);
83 static void nd6_dad_stoptimer(struct dadq *);
84 static void nd6_dad_timer(struct dadq *);
85 static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
86 static void nd6_dad_ns_input(struct ifaddr *);
87 static void nd6_dad_na_input(struct ifaddr *);
88 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
89 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
91 VNET_DEFINE(int, dad_ignore_ns) = 0; /* ignore NS in DAD - specwise incorrect*/
92 VNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to transmit DAD packet */
93 #define V_dad_ignore_ns VNET(dad_ignore_ns)
94 #define V_dad_maxtry VNET(dad_maxtry)
97 * Input a Neighbor Solicitation Message.
100 * Based on RFC 2462 (duplicate address detection)
103 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
105 struct ifnet *ifp = m->m_pkthdr.rcvif;
106 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
107 struct nd_neighbor_solicit *nd_ns;
108 struct in6_addr saddr6 = ip6->ip6_src;
109 struct in6_addr daddr6 = ip6->ip6_dst;
110 struct in6_addr taddr6;
111 struct in6_addr myaddr6;
113 struct ifaddr *ifa = NULL;
115 int anycast = 0, proxy = 0, tentative = 0;
118 union nd_opts ndopts;
119 struct sockaddr_dl proxydl;
120 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
122 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
123 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
125 #ifndef PULLDOWN_TEST
126 IP6_EXTHDR_CHECK(m, off, icmp6len,);
127 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
129 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
131 ICMP6STAT_INC(icp6s_tooshort);
135 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
136 taddr6 = nd_ns->nd_ns_target;
137 if (in6_setscope(&taddr6, ifp, NULL) != 0)
140 if (ip6->ip6_hlim != 255) {
142 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
143 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
144 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
149 /* dst has to be a solicited node multicast address. */
150 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
151 /* don't check ifindex portion */
152 daddr6.s6_addr32[1] == 0 &&
153 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
154 daddr6.s6_addr8[12] == 0xff) {
157 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
158 "(wrong ip6 dst)\n"));
161 } else if (!V_nd6_onlink_ns_rfc4861) {
162 struct sockaddr_in6 src_sa6;
165 * According to recent IETF discussions, it is not a good idea
166 * to accept a NS from an address which would not be deemed
167 * to be a neighbor otherwise. This point is expected to be
168 * clarified in future revisions of the specification.
170 bzero(&src_sa6, sizeof(src_sa6));
171 src_sa6.sin6_family = AF_INET6;
172 src_sa6.sin6_len = sizeof(src_sa6);
173 src_sa6.sin6_addr = saddr6;
174 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
175 nd6log((LOG_INFO, "nd6_ns_input: "
176 "NS packet from non-neighbor\n"));
181 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
182 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
186 icmp6len -= sizeof(*nd_ns);
187 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
188 if (nd6_options(&ndopts) < 0) {
190 "nd6_ns_input: invalid ND option, ignored\n"));
191 /* nd6_options have incremented stats */
195 if (ndopts.nd_opts_src_lladdr) {
196 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
197 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
200 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
201 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
202 "(link-layer address option)\n"));
207 * Attaching target link-layer address to the NA?
210 * NS IP dst is unicast/anycast MUST NOT add
211 * NS IP dst is solicited-node multicast MUST add
213 * In implementation, we add target link-layer address by default.
214 * We do not add one in MUST NOT cases.
216 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
222 * Target address (taddr6) must be either:
223 * (1) Valid unicast/anycast address for my receiving interface,
224 * (2) Unicast address for which I'm offering proxy service, or
225 * (3) "tentative" address on which DAD is being performed.
227 /* (1) and (3) check. */
229 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
231 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
236 struct sockaddr_in6 tsin6;
242 bzero(&tsin6, sizeof tsin6);
243 tsin6.sin6_len = sizeof(struct sockaddr_in6);
244 tsin6.sin6_family = AF_INET6;
245 tsin6.sin6_addr = taddr6;
247 /* Always use the default FIB. */
249 bzero(&ro, sizeof(ro));
251 rtalloc_mpath_fib((struct route *)&ro, RTF_ANNOUNCE,
255 rt = in6_rtalloc1((struct sockaddr *)&tsin6, 0, 0,
258 need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
259 rt->rt_gateway->sa_family == AF_LINK);
262 * Make a copy while we can be sure that rt_gateway
263 * is still stable before unlocking to avoid lock
264 * order problems. proxydl will only be used if
265 * proxy will be set in the next block.
268 proxydl = *SDL(rt->rt_gateway);
273 * proxy NDP for single entry
275 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
276 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
283 * We've got an NS packet, and we don't have that adddress
284 * assigned for us. We MUST silently ignore it.
289 myaddr6 = *IFA_IN6(ifa);
290 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
291 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
292 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
295 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
296 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
297 "(if %d, NS packet %d)\n",
298 ip6_sprintf(ip6bufs, &taddr6),
299 ifp->if_addrlen, lladdrlen - 2));
303 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
304 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
305 ip6_sprintf(ip6bufs, &saddr6)));
310 * We have neighbor solicitation packet, with target address equals to
311 * one of my tentative address.
313 * src addr how to process?
315 * multicast of course, invalid (rejected in ip6_input)
316 * unicast somebody is doing address resolution -> ignore
317 * unspec dup address detection
319 * The processing is defined in RFC 2462.
323 * If source address is unspecified address, it is for
324 * duplicate address detection.
326 * If not, the packet is for addess resolution;
327 * silently ignore it.
329 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
330 nd6_dad_ns_input(ifa);
336 * If the source address is unspecified address, entries must not
337 * be created or updated.
338 * It looks that sender is performing DAD. Output NA toward
339 * all-node multicast address, to tell the sender that I'm using
341 * S bit ("solicited") must be zero.
343 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
344 struct in6_addr in6_all;
346 in6_all = in6addr_linklocal_allnodes;
347 if (in6_setscope(&in6_all, ifp, NULL) != 0)
349 nd6_na_output_fib(ifp, &in6_all, &taddr6,
350 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
351 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
356 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
357 ND_NEIGHBOR_SOLICIT, 0);
359 nd6_na_output_fib(ifp, &saddr6, &taddr6,
360 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
361 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
362 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
370 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
371 ip6_sprintf(ip6bufs, &saddr6)));
372 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
373 ip6_sprintf(ip6bufs, &daddr6)));
374 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
375 ip6_sprintf(ip6bufs, &taddr6)));
376 ICMP6STAT_INC(icp6s_badns);
383 * Output a Neighbor Solicitation Message. Caller specifies:
384 * - ICMP6 header source IP6 address
385 * - ND6 header target IP6 address
386 * - ND6 header source datalink address
389 * Based on RFC 2462 (duplicate address detection)
391 * ln - for source address determination
392 * dad - duplicate address detection
395 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
396 const struct in6_addr *taddr6, struct llentry *ln, int dad)
401 struct nd_neighbor_solicit *nd_ns;
402 struct ip6_moptions im6o;
408 if (IN6_IS_ADDR_MULTICAST(taddr6))
411 /* estimate the size of message */
412 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
413 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
414 if (max_linkhdr + maxlen >= MCLBYTES) {
416 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
417 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
422 if (max_linkhdr + maxlen > MHLEN)
423 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
425 m = m_gethdr(M_NOWAIT, MT_DATA);
429 bzero(&ro, sizeof(ro));
431 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
432 m->m_flags |= M_MCAST;
433 im6o.im6o_multicast_ifp = ifp;
434 im6o.im6o_multicast_hlim = 255;
435 im6o.im6o_multicast_loop = 0;
438 icmp6len = sizeof(*nd_ns);
439 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
440 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
442 /* fill neighbor solicitation packet */
443 ip6 = mtod(m, struct ip6_hdr *);
445 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
446 ip6->ip6_vfc |= IPV6_VERSION;
447 /* ip6->ip6_plen will be set later */
448 ip6->ip6_nxt = IPPROTO_ICMPV6;
451 ip6->ip6_dst = *daddr6;
453 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
454 ip6->ip6_dst.s6_addr16[1] = 0;
455 ip6->ip6_dst.s6_addr32[1] = 0;
456 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
457 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
458 ip6->ip6_dst.s6_addr8[12] = 0xff;
459 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
467 * "If the source address of the packet prompting the
468 * solicitation is the same as one of the addresses assigned
469 * to the outgoing interface, that address SHOULD be placed
470 * in the IP Source Address of the outgoing solicitation.
471 * Otherwise, any one of the addresses assigned to the
472 * interface should be used."
474 * We use the source address for the prompting packet
476 * - saddr6 is given from the caller (by giving "ln"), and
477 * - saddr6 belongs to the outgoing interface.
478 * Otherwise, we perform the source address selection as usual.
480 struct in6_addr *hsrc;
485 if (ln->la_hold != NULL) {
486 struct ip6_hdr *hip6; /* hold ip6 */
489 * assuming every packet in la_hold has the same IP
492 hip6 = mtod(ln->la_hold, struct ip6_hdr *);
494 if (sizeof(*hip6) < ln->la_hold->m_len) {
495 ip6->ip6_src = hip6->ip6_src;
496 hsrc = &hip6->ip6_src;
501 if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
503 /* ip6_src set already. */
507 struct sockaddr_in6 dst_sa;
508 struct in6_addr src_in;
511 bzero(&dst_sa, sizeof(dst_sa));
512 dst_sa.sin6_family = AF_INET6;
513 dst_sa.sin6_len = sizeof(dst_sa);
514 dst_sa.sin6_addr = ip6->ip6_dst;
517 error = in6_selectsrc(&dst_sa, NULL,
518 NULL, &ro, NULL, &oifp, &src_in);
520 char ip6buf[INET6_ADDRSTRLEN];
522 "nd6_ns_output: source can't be "
523 "determined: dst=%s, error=%d\n",
524 ip6_sprintf(ip6buf, &dst_sa.sin6_addr),
528 ip6->ip6_src = src_in;
532 * Source address for DAD packet must always be IPv6
533 * unspecified address. (0::0)
534 * We actually don't have to 0-clear the address (we did it
535 * above), but we do so here explicitly to make the intention
538 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
540 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
541 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
542 nd_ns->nd_ns_code = 0;
543 nd_ns->nd_ns_reserved = 0;
544 nd_ns->nd_ns_target = *taddr6;
545 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
548 * Add source link-layer address option.
550 * spec implementation
552 * DAD packet MUST NOT do not add the option
553 * there's no link layer address:
554 * impossible do not add the option
555 * there's link layer address:
556 * Multicast NS MUST add one add the option
557 * Unicast NS SHOULD add one add the option
559 if (!dad && (mac = nd6_ifptomac(ifp))) {
560 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
561 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
562 /* 8 byte alignments... */
563 optlen = (optlen + 7) & ~7;
565 m->m_pkthdr.len += optlen;
568 bzero((caddr_t)nd_opt, optlen);
569 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
570 nd_opt->nd_opt_len = optlen >> 3;
571 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
574 ip6->ip6_plen = htons((u_short)icmp6len);
575 nd_ns->nd_ns_cksum = 0;
577 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
579 if (send_sendso_input_hook != NULL) {
580 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
581 sizeof(unsigned short), M_NOWAIT);
584 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
585 m_tag_prepend(m, mtag);
588 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
589 icmp6_ifstat_inc(ifp, ifs6_out_msg);
590 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
591 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
593 /* We don't cache this route. */
607 * Neighbor advertisement input handling.
610 * Based on RFC 2462 (duplicate address detection)
612 * the following items are not implemented yet:
613 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
614 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
617 nd6_na_input(struct mbuf *m, int off, int icmp6len)
619 struct ifnet *ifp = m->m_pkthdr.rcvif;
620 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
621 struct nd_neighbor_advert *nd_na;
622 struct in6_addr daddr6 = ip6->ip6_dst;
623 struct in6_addr taddr6;
632 struct llentry *ln = NULL;
633 union nd_opts ndopts;
634 struct mbuf *chain = NULL;
636 struct sockaddr_in6 sin6;
637 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
639 if (ip6->ip6_hlim != 255) {
641 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
642 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
643 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
647 #ifndef PULLDOWN_TEST
648 IP6_EXTHDR_CHECK(m, off, icmp6len,);
649 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
651 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
653 ICMP6STAT_INC(icp6s_tooshort);
658 flags = nd_na->nd_na_flags_reserved;
659 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
660 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
661 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
663 taddr6 = nd_na->nd_na_target;
664 if (in6_setscope(&taddr6, ifp, NULL))
665 goto bad; /* XXX: impossible */
667 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
669 "nd6_na_input: invalid target address %s\n",
670 ip6_sprintf(ip6bufs, &taddr6)));
673 if (IN6_IS_ADDR_MULTICAST(&daddr6))
676 "nd6_na_input: a solicited adv is multicasted\n"));
680 icmp6len -= sizeof(*nd_na);
681 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
682 if (nd6_options(&ndopts) < 0) {
684 "nd6_na_input: invalid ND option, ignored\n"));
685 /* nd6_options have incremented stats */
689 if (ndopts.nd_opts_tgt_lladdr) {
690 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
691 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
695 * This effectively disables the DAD check on a non-master CARP
699 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
701 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
704 * Target address matches one of my interface address.
706 * If my address is tentative, this means that there's somebody
707 * already using the same address as mine. This indicates DAD failure.
708 * This is defined in RFC 2462.
710 * Otherwise, process as defined in RFC 2461.
713 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
715 nd6_dad_na_input(ifa);
719 /* Just for safety, maybe unnecessary. */
723 "nd6_na_input: duplicate IP6 address %s\n",
724 ip6_sprintf(ip6bufs, &taddr6));
728 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
729 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
730 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
731 ifp->if_addrlen, lladdrlen - 2));
736 * If no neighbor cache entry is found, NA SHOULD silently be
740 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
741 IF_AFDATA_UNLOCK(ifp);
746 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
748 * If the link-layer has address, and no lladdr option came,
749 * discard the packet.
751 if (ifp->if_addrlen && lladdr == NULL) {
756 * Record link-layer address, and update the state.
758 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
759 ln->la_flags |= LLE_VALID;
760 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
762 ln->ln_state = ND6_LLINFO_REACHABLE;
764 if (!ND6_LLINFO_PERMANENT(ln)) {
765 nd6_llinfo_settimer_locked(ln,
766 (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz);
769 ln->ln_state = ND6_LLINFO_STALE;
770 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
772 if ((ln->ln_router = is_router) != 0) {
774 * This means a router's state has changed from
775 * non-reachable to probably reachable, and might
776 * affect the status of associated prefixes..
784 * Check if the link-layer address has changed or not.
789 if (ln->la_flags & LLE_VALID) {
790 if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
799 * This is VERY complex. Look at it with care.
801 * override solicit lladdr llchange action
806 * 0 0 y y (1) REACHABLE->STALE
807 * 0 1 n -- (2c) *->REACHABLE
808 * 0 1 y n (2b) L *->REACHABLE
809 * 0 1 y y (1) REACHABLE->STALE
812 * 1 0 y y (2a) L *->STALE
813 * 1 1 n -- (2a) *->REACHABLE
814 * 1 1 y n (2a) L *->REACHABLE
815 * 1 1 y y (2a) L *->REACHABLE
817 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
819 * If state is REACHABLE, make it STALE.
820 * no other updates should be done.
822 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
823 ln->ln_state = ND6_LLINFO_STALE;
824 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
827 } else if (is_override /* (2a) */
828 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
829 || lladdr == NULL) { /* (2c) */
831 * Update link-local address, if any.
833 if (lladdr != NULL) {
834 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
835 ln->la_flags |= LLE_VALID;
836 EVENTHANDLER_INVOKE(lle_event, ln,
841 * If solicited, make the state REACHABLE.
842 * If not solicited and the link-layer address was
843 * changed, make it STALE.
846 ln->ln_state = ND6_LLINFO_REACHABLE;
848 if (!ND6_LLINFO_PERMANENT(ln)) {
849 nd6_llinfo_settimer_locked(ln,
850 (long)ND_IFINFO(ifp)->reachable * hz);
853 if (lladdr != NULL && llchange) {
854 ln->ln_state = ND6_LLINFO_STALE;
855 nd6_llinfo_settimer_locked(ln,
856 (long)V_nd6_gctimer * hz);
861 if (ln->ln_router && !is_router) {
863 * The peer dropped the router flag.
864 * Remove the sender from the Default Router List and
865 * update the Destination Cache entries.
867 struct nd_defrouter *dr;
868 struct in6_addr *in6;
870 in6 = &L3_ADDR_SIN6(ln)->sin6_addr;
873 * Lock to protect the default router list.
874 * XXX: this might be unnecessary, since this function
875 * is only called under the network software interrupt
876 * context. However, we keep it just for safety.
878 dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
881 else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags &
882 ND6_IFF_ACCEPT_RTADV) {
884 * Even if the neighbor is not in the default
885 * router list, the neighbor may be used
886 * as a next hop for some destinations
887 * (e.g. redirect case). So we must
888 * call rt6_flush explicitly.
890 rt6_flush(&ip6->ip6_src, ifp);
893 ln->ln_router = is_router;
897 * rt->rt_flags &= ~RTF_REJECT;
901 struct mbuf *m_hold, *m_hold_next;
904 * reset the la_hold in advance, to explicitly
905 * prevent a la_hold lookup in nd6_output()
906 * (wouldn't happen, though...)
908 for (m_hold = ln->la_hold, ln->la_hold = NULL;
909 m_hold; m_hold = m_hold_next) {
910 m_hold_next = m_hold->m_nextpkt;
911 m_hold->m_nextpkt = NULL;
913 * we assume ifp is not a loopback here, so just set
914 * the 2nd argument as the 1st one.
917 if (send_sendso_input_hook != NULL) {
918 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
919 sizeof(unsigned short), M_NOWAIT);
922 m_tag_prepend(m, mtag);
925 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
931 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
935 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
938 pfxlist_onlink_check();
947 ICMP6STAT_INC(icp6s_badna);
952 * Neighbor advertisement output handling.
956 * the following items are not implemented yet:
957 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
958 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
960 * tlladdr - 1 if include target link-layer address
961 * sdl0 - sockaddr_dl (= proxy NA) or NULL
964 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
965 const struct in6_addr *taddr6, u_long flags, int tlladdr,
966 struct sockaddr *sdl0, u_int fibnum)
972 struct nd_neighbor_advert *nd_na;
973 struct ip6_moptions im6o;
974 struct in6_addr src, daddr6;
975 struct sockaddr_in6 dst_sa;
976 int icmp6len, maxlen, error;
980 bzero(&ro, sizeof(ro));
982 daddr6 = *daddr6_0; /* make a local copy for modification */
984 /* estimate the size of message */
985 maxlen = sizeof(*ip6) + sizeof(*nd_na);
986 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
987 if (max_linkhdr + maxlen >= MCLBYTES) {
989 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
990 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
995 if (max_linkhdr + maxlen > MHLEN)
996 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
998 m = m_gethdr(M_NOWAIT, MT_DATA);
1001 M_SETFIB(m, fibnum);
1003 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
1004 m->m_flags |= M_MCAST;
1005 im6o.im6o_multicast_ifp = ifp;
1006 im6o.im6o_multicast_hlim = 255;
1007 im6o.im6o_multicast_loop = 0;
1010 icmp6len = sizeof(*nd_na);
1011 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
1012 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
1014 /* fill neighbor advertisement packet */
1015 ip6 = mtod(m, struct ip6_hdr *);
1017 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1018 ip6->ip6_vfc |= IPV6_VERSION;
1019 ip6->ip6_nxt = IPPROTO_ICMPV6;
1020 ip6->ip6_hlim = 255;
1021 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1023 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1024 daddr6.s6_addr16[1] = 0;
1025 daddr6.s6_addr32[1] = 0;
1026 daddr6.s6_addr32[2] = 0;
1027 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1028 if (in6_setscope(&daddr6, ifp, NULL))
1031 flags &= ~ND_NA_FLAG_SOLICITED;
1033 ip6->ip6_dst = daddr6;
1034 bzero(&dst_sa, sizeof(struct sockaddr_in6));
1035 dst_sa.sin6_family = AF_INET6;
1036 dst_sa.sin6_len = sizeof(struct sockaddr_in6);
1037 dst_sa.sin6_addr = daddr6;
1040 * Select a source whose scope is the same as that of the dest.
1042 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1044 error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src);
1046 char ip6buf[INET6_ADDRSTRLEN];
1047 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1048 "determined: dst=%s, error=%d\n",
1049 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error));
1053 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1054 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1055 nd_na->nd_na_code = 0;
1056 nd_na->nd_na_target = *taddr6;
1057 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1060 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1061 * see nd6_ns_input() for details.
1062 * Basically, if NS packet is sent to unicast/anycast addr,
1063 * target lladdr option SHOULD NOT be included.
1067 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1068 * lladdr in sdl0. If we are not proxying (sending NA for
1069 * my address) use lladdr configured for the interface.
1073 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1075 mac = nd6_ifptomac(ifp);
1076 } else if (sdl0->sa_family == AF_LINK) {
1077 struct sockaddr_dl *sdl;
1078 sdl = (struct sockaddr_dl *)sdl0;
1079 if (sdl->sdl_alen == ifp->if_addrlen)
1083 if (tlladdr && mac) {
1084 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1085 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1087 /* roundup to 8 bytes alignment! */
1088 optlen = (optlen + 7) & ~7;
1090 m->m_pkthdr.len += optlen;
1093 bzero((caddr_t)nd_opt, optlen);
1094 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1095 nd_opt->nd_opt_len = optlen >> 3;
1096 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1098 flags &= ~ND_NA_FLAG_OVERRIDE;
1100 ip6->ip6_plen = htons((u_short)icmp6len);
1101 nd_na->nd_na_flags_reserved = flags;
1102 nd_na->nd_na_cksum = 0;
1103 nd_na->nd_na_cksum =
1104 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1106 if (send_sendso_input_hook != NULL) {
1107 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1108 sizeof(unsigned short), M_NOWAIT);
1111 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1112 m_tag_prepend(m, mtag);
1115 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
1116 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1117 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1118 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1120 /* We don't cache this route. */
1133 #ifndef BURN_BRIDGES
1135 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1136 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1137 struct sockaddr *sdl0)
1140 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1146 nd6_ifptomac(struct ifnet *ifp)
1148 switch (ifp->if_type) {
1156 #ifdef IFT_IEEE80211
1159 case IFT_INFINIBAND:
1162 return IF_LLADDR(ifp);
1169 TAILQ_ENTRY(dadq) dad_list;
1170 struct ifaddr *dad_ifa;
1171 int dad_count; /* max NS to send */
1172 int dad_ns_tcount; /* # of trials to send NS */
1173 int dad_ns_ocount; /* NS sent so far */
1176 struct callout dad_timer_ch;
1177 struct vnet *dad_vnet;
1180 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1181 VNET_DEFINE(int, dad_init) = 0;
1182 #define V_dadq VNET(dadq)
1183 #define V_dad_init VNET(dad_init)
1185 static struct dadq *
1186 nd6_dad_find(struct ifaddr *ifa)
1190 TAILQ_FOREACH(dp, &V_dadq, dad_list)
1191 if (dp->dad_ifa == ifa)
1198 nd6_dad_starttimer(struct dadq *dp, int ticks)
1201 callout_reset(&dp->dad_timer_ch, ticks,
1202 (void (*)(void *))nd6_dad_timer, (void *)dp);
1206 nd6_dad_stoptimer(struct dadq *dp)
1209 callout_stop(&dp->dad_timer_ch);
1213 * Start Duplicate Address Detection (DAD) for specified interface address.
1216 nd6_dad_start(struct ifaddr *ifa, int delay)
1218 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1220 char ip6buf[INET6_ADDRSTRLEN];
1223 TAILQ_INIT(&V_dadq);
1228 * If we don't need DAD, don't do it.
1229 * There are several cases:
1230 * - DAD is disabled (ip6_dad_count == 0)
1231 * - the interface address is anycast
1233 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1235 "nd6_dad_start: called with non-tentative address "
1237 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1238 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1241 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1242 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1245 if (!V_ip6_dad_count) {
1246 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1249 if (ifa->ifa_ifp == NULL)
1250 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1251 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) {
1254 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)
1256 if (nd6_dad_find(ifa) != NULL) {
1257 /* DAD already in progress */
1261 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1263 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1265 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1266 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1269 bzero(dp, sizeof(*dp));
1270 callout_init(&dp->dad_timer_ch, 0);
1272 dp->dad_vnet = curvnet;
1274 TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list);
1276 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1277 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1280 * Send NS packet for DAD, ip6_dad_count times.
1281 * Note that we must delay the first transmission, if this is the
1282 * first packet to be sent from the interface after interface
1283 * (re)initialization.
1286 ifa_ref(ifa); /* just for safety */
1287 dp->dad_count = V_ip6_dad_count;
1288 dp->dad_ns_icount = dp->dad_na_icount = 0;
1289 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1291 nd6_dad_ns_output(dp, ifa);
1292 nd6_dad_starttimer(dp,
1293 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1295 nd6_dad_starttimer(dp, delay);
1300 * terminate DAD unconditionally. used for address removals.
1303 nd6_dad_stop(struct ifaddr *ifa)
1309 dp = nd6_dad_find(ifa);
1311 /* DAD wasn't started yet */
1315 nd6_dad_stoptimer(dp);
1317 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1324 nd6_dad_timer(struct dadq *dp)
1326 CURVNET_SET(dp->dad_vnet);
1327 struct ifaddr *ifa = dp->dad_ifa;
1328 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1329 char ip6buf[INET6_ADDRSTRLEN];
1333 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1336 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1337 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1339 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1340 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1343 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1344 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1346 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1347 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1351 /* timeouted with IFF_{RUNNING,UP} check */
1352 if (dp->dad_ns_tcount > V_dad_maxtry) {
1353 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1354 if_name(ifa->ifa_ifp)));
1356 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1363 /* Need more checks? */
1364 if (dp->dad_ns_ocount < dp->dad_count) {
1366 * We have more NS to go. Send NS packet for DAD.
1368 nd6_dad_ns_output(dp, ifa);
1369 nd6_dad_starttimer(dp,
1370 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1373 * We have transmitted sufficient number of DAD packets.
1374 * See what we've got.
1380 if (dp->dad_na_icount) {
1382 * the check is in nd6_dad_na_input(),
1388 if (dp->dad_ns_icount) {
1389 /* We've seen NS, means DAD has failed. */
1394 /* (*dp) will be freed in nd6_dad_duplicated() */
1396 nd6_dad_duplicated(ifa);
1399 * We are done with DAD. No NA came, no NS came.
1400 * No duplicate address found.
1402 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1405 "%s: DAD complete for %s - no duplicates found\n",
1406 if_name(ifa->ifa_ifp),
1407 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1409 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1421 nd6_dad_duplicated(struct ifaddr *ifa)
1423 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1426 char ip6buf[INET6_ADDRSTRLEN];
1428 dp = nd6_dad_find(ifa);
1430 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1434 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1435 "NS in/out=%d/%d, NA in=%d\n",
1436 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1437 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1439 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1440 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1442 /* We are done with DAD, with duplicate address found. (failure) */
1443 nd6_dad_stoptimer(dp);
1446 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1447 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1448 log(LOG_ERR, "%s: manual intervention required\n",
1452 * If the address is a link-local address formed from an interface
1453 * identifier based on the hardware address which is supposed to be
1454 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1455 * operation on the interface SHOULD be disabled.
1456 * [RFC 4862, Section 5.4.5]
1458 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1459 struct in6_addr in6;
1462 * To avoid over-reaction, we only apply this logic when we are
1463 * very sure that hardware addresses are supposed to be unique.
1465 switch (ifp->if_type) {
1470 #ifdef IFT_IEEE80211
1473 case IFT_INFINIBAND:
1474 in6 = ia->ia_addr.sin6_addr;
1475 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1476 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1477 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1478 log(LOG_ERR, "%s: possible hardware address "
1479 "duplication detected, disable IPv6\n",
1486 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1493 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1495 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1496 struct ifnet *ifp = ifa->ifa_ifp;
1498 dp->dad_ns_tcount++;
1499 if ((ifp->if_flags & IFF_UP) == 0) {
1502 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1506 dp->dad_ns_ocount++;
1507 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1511 nd6_dad_ns_input(struct ifaddr *ifa)
1513 struct in6_ifaddr *ia;
1515 const struct in6_addr *taddr6;
1520 panic("ifa == NULL in nd6_dad_ns_input");
1522 ia = (struct in6_ifaddr *)ifa;
1524 taddr6 = &ia->ia_addr.sin6_addr;
1526 dp = nd6_dad_find(ifa);
1528 /* Quickhack - completely ignore DAD NS packets */
1529 if (V_dad_ignore_ns) {
1530 char ip6buf[INET6_ADDRSTRLEN];
1532 "nd6_dad_ns_input: ignoring DAD NS packet for "
1533 "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6),
1534 if_name(ifa->ifa_ifp)));
1539 * if I'm yet to start DAD, someone else started using this address
1540 * first. I have a duplicate and you win.
1542 if (dp == NULL || dp->dad_ns_ocount == 0)
1545 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1548 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1549 nd6_dad_duplicated(ifa);
1552 * not sure if I got a duplicate.
1553 * increment ns count and see what happens.
1556 dp->dad_ns_icount++;
1561 nd6_dad_na_input(struct ifaddr *ifa)
1566 panic("ifa == NULL in nd6_dad_na_input");
1568 dp = nd6_dad_find(ifa);
1570 dp->dad_na_icount++;
1572 /* remove the address. */
1573 nd6_dad_duplicated(ifa);