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);
238 bzero(&ro, sizeof(ro));
239 ro.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
240 ro.ro_dst.sin6_family = AF_INET6;
241 ro.ro_dst.sin6_addr = taddr6;
243 /* Always use the default FIB. */
245 rtalloc_mpath_fib((struct route *)&ro, RTF_ANNOUNCE,
248 in6_rtalloc(&ro, RT_DEFAULT_FIB);
250 need_proxy = (ro.ro_rt &&
251 (ro.ro_rt->rt_flags & RTF_ANNOUNCE) != 0 &&
252 ro.ro_rt->rt_gateway->sa_family == AF_LINK);
253 if (ro.ro_rt != NULL) {
255 proxydl = *SDL(ro.ro_rt->rt_gateway);
260 * proxy NDP for single entry
262 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
263 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
270 * We've got an NS packet, and we don't have that adddress
271 * assigned for us. We MUST silently ignore it.
276 myaddr6 = *IFA_IN6(ifa);
277 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
278 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
279 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
282 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
283 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
284 "(if %d, NS packet %d)\n",
285 ip6_sprintf(ip6bufs, &taddr6),
286 ifp->if_addrlen, lladdrlen - 2));
290 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
291 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
292 ip6_sprintf(ip6bufs, &saddr6)));
297 * We have neighbor solicitation packet, with target address equals to
298 * one of my tentative address.
300 * src addr how to process?
302 * multicast of course, invalid (rejected in ip6_input)
303 * unicast somebody is doing address resolution -> ignore
304 * unspec dup address detection
306 * The processing is defined in RFC 2462.
310 * If source address is unspecified address, it is for
311 * duplicate address detection.
313 * If not, the packet is for addess resolution;
314 * silently ignore it.
316 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
317 nd6_dad_ns_input(ifa);
323 * If the source address is unspecified address, entries must not
324 * be created or updated.
325 * It looks that sender is performing DAD. Output NA toward
326 * all-node multicast address, to tell the sender that I'm using
328 * S bit ("solicited") must be zero.
330 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
331 struct in6_addr in6_all;
333 in6_all = in6addr_linklocal_allnodes;
334 if (in6_setscope(&in6_all, ifp, NULL) != 0)
336 nd6_na_output_fib(ifp, &in6_all, &taddr6,
337 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
338 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
343 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
344 ND_NEIGHBOR_SOLICIT, 0);
346 nd6_na_output_fib(ifp, &saddr6, &taddr6,
347 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
348 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
349 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
357 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
358 ip6_sprintf(ip6bufs, &saddr6)));
359 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
360 ip6_sprintf(ip6bufs, &daddr6)));
361 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
362 ip6_sprintf(ip6bufs, &taddr6)));
363 ICMP6STAT_INC(icp6s_badns);
370 * Output a Neighbor Solicitation Message. Caller specifies:
371 * - ICMP6 header source IP6 address
372 * - ND6 header target IP6 address
373 * - ND6 header source datalink address
376 * Based on RFC 2462 (duplicate address detection)
378 * ln - for source address determination
379 * dad - duplicate address detection
382 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
383 const struct in6_addr *taddr6, struct llentry *ln, int dad)
388 struct nd_neighbor_solicit *nd_ns;
389 struct ip6_moptions im6o;
395 if (IN6_IS_ADDR_MULTICAST(taddr6))
398 /* estimate the size of message */
399 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
400 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
401 if (max_linkhdr + maxlen >= MCLBYTES) {
403 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
404 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
409 if (max_linkhdr + maxlen > MHLEN)
410 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
412 m = m_gethdr(M_NOWAIT, MT_DATA);
416 bzero(&ro, sizeof(ro));
418 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
419 m->m_flags |= M_MCAST;
420 im6o.im6o_multicast_ifp = ifp;
421 im6o.im6o_multicast_hlim = 255;
422 im6o.im6o_multicast_loop = 0;
425 icmp6len = sizeof(*nd_ns);
426 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
427 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
429 /* fill neighbor solicitation packet */
430 ip6 = mtod(m, struct ip6_hdr *);
432 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
433 ip6->ip6_vfc |= IPV6_VERSION;
434 /* ip6->ip6_plen will be set later */
435 ip6->ip6_nxt = IPPROTO_ICMPV6;
438 ip6->ip6_dst = *daddr6;
440 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
441 ip6->ip6_dst.s6_addr16[1] = 0;
442 ip6->ip6_dst.s6_addr32[1] = 0;
443 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
444 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
445 ip6->ip6_dst.s6_addr8[12] = 0xff;
446 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
454 * "If the source address of the packet prompting the
455 * solicitation is the same as one of the addresses assigned
456 * to the outgoing interface, that address SHOULD be placed
457 * in the IP Source Address of the outgoing solicitation.
458 * Otherwise, any one of the addresses assigned to the
459 * interface should be used."
461 * We use the source address for the prompting packet
463 * - saddr6 is given from the caller (by giving "ln"), and
464 * - saddr6 belongs to the outgoing interface.
465 * Otherwise, we perform the source address selection as usual.
467 struct in6_addr *hsrc;
472 if (ln->la_hold != NULL) {
473 struct ip6_hdr *hip6; /* hold ip6 */
476 * assuming every packet in la_hold has the same IP
479 hip6 = mtod(ln->la_hold, struct ip6_hdr *);
481 if (sizeof(*hip6) < ln->la_hold->m_len) {
482 ip6->ip6_src = hip6->ip6_src;
483 hsrc = &hip6->ip6_src;
488 if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
490 /* ip6_src set already. */
494 struct sockaddr_in6 dst_sa;
495 struct in6_addr src_in;
498 bzero(&dst_sa, sizeof(dst_sa));
499 dst_sa.sin6_family = AF_INET6;
500 dst_sa.sin6_len = sizeof(dst_sa);
501 dst_sa.sin6_addr = ip6->ip6_dst;
504 error = in6_selectsrc(&dst_sa, NULL,
505 NULL, &ro, NULL, &oifp, &src_in);
507 char ip6buf[INET6_ADDRSTRLEN];
509 "nd6_ns_output: source can't be "
510 "determined: dst=%s, error=%d\n",
511 ip6_sprintf(ip6buf, &dst_sa.sin6_addr),
515 ip6->ip6_src = src_in;
519 * Source address for DAD packet must always be IPv6
520 * unspecified address. (0::0)
521 * We actually don't have to 0-clear the address (we did it
522 * above), but we do so here explicitly to make the intention
525 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
527 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
528 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
529 nd_ns->nd_ns_code = 0;
530 nd_ns->nd_ns_reserved = 0;
531 nd_ns->nd_ns_target = *taddr6;
532 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
535 * Add source link-layer address option.
537 * spec implementation
539 * DAD packet MUST NOT do not add the option
540 * there's no link layer address:
541 * impossible do not add the option
542 * there's link layer address:
543 * Multicast NS MUST add one add the option
544 * Unicast NS SHOULD add one add the option
546 if (!dad && (mac = nd6_ifptomac(ifp))) {
547 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
548 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
549 /* 8 byte alignments... */
550 optlen = (optlen + 7) & ~7;
552 m->m_pkthdr.len += optlen;
555 bzero((caddr_t)nd_opt, optlen);
556 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
557 nd_opt->nd_opt_len = optlen >> 3;
558 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
561 ip6->ip6_plen = htons((u_short)icmp6len);
562 nd_ns->nd_ns_cksum = 0;
564 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
566 if (send_sendso_input_hook != NULL) {
567 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
568 sizeof(unsigned short), M_NOWAIT);
571 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
572 m_tag_prepend(m, mtag);
575 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
576 icmp6_ifstat_inc(ifp, ifs6_out_msg);
577 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
578 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
580 /* We don't cache this route. */
594 * Neighbor advertisement input handling.
597 * Based on RFC 2462 (duplicate address detection)
599 * the following items are not implemented yet:
600 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
601 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
604 nd6_na_input(struct mbuf *m, int off, int icmp6len)
606 struct ifnet *ifp = m->m_pkthdr.rcvif;
607 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
608 struct nd_neighbor_advert *nd_na;
609 struct in6_addr daddr6 = ip6->ip6_dst;
610 struct in6_addr taddr6;
619 struct llentry *ln = NULL;
620 union nd_opts ndopts;
621 struct mbuf *chain = NULL;
623 struct sockaddr_in6 sin6;
624 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
626 if (ip6->ip6_hlim != 255) {
628 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
629 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
630 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
634 #ifndef PULLDOWN_TEST
635 IP6_EXTHDR_CHECK(m, off, icmp6len,);
636 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
638 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
640 ICMP6STAT_INC(icp6s_tooshort);
645 flags = nd_na->nd_na_flags_reserved;
646 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
647 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
648 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
650 taddr6 = nd_na->nd_na_target;
651 if (in6_setscope(&taddr6, ifp, NULL))
652 goto bad; /* XXX: impossible */
654 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
656 "nd6_na_input: invalid target address %s\n",
657 ip6_sprintf(ip6bufs, &taddr6)));
660 if (IN6_IS_ADDR_MULTICAST(&daddr6))
663 "nd6_na_input: a solicited adv is multicasted\n"));
667 icmp6len -= sizeof(*nd_na);
668 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
669 if (nd6_options(&ndopts) < 0) {
671 "nd6_na_input: invalid ND option, ignored\n"));
672 /* nd6_options have incremented stats */
676 if (ndopts.nd_opts_tgt_lladdr) {
677 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
678 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
682 * This effectively disables the DAD check on a non-master CARP
686 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
688 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
691 * Target address matches one of my interface address.
693 * If my address is tentative, this means that there's somebody
694 * already using the same address as mine. This indicates DAD failure.
695 * This is defined in RFC 2462.
697 * Otherwise, process as defined in RFC 2461.
700 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
702 nd6_dad_na_input(ifa);
706 /* Just for safety, maybe unnecessary. */
710 "nd6_na_input: duplicate IP6 address %s\n",
711 ip6_sprintf(ip6bufs, &taddr6));
715 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
716 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
717 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
718 ifp->if_addrlen, lladdrlen - 2));
723 * If no neighbor cache entry is found, NA SHOULD silently be
726 IF_AFDATA_RLOCK(ifp);
727 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
728 IF_AFDATA_RUNLOCK(ifp);
733 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
735 * If the link-layer has address, and no lladdr option came,
736 * discard the packet.
738 if (ifp->if_addrlen && lladdr == NULL) {
743 * Record link-layer address, and update the state.
745 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
746 ln->la_flags |= LLE_VALID;
747 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
749 ln->ln_state = ND6_LLINFO_REACHABLE;
751 if (!ND6_LLINFO_PERMANENT(ln)) {
752 nd6_llinfo_settimer_locked(ln,
753 (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz);
756 ln->ln_state = ND6_LLINFO_STALE;
757 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
759 if ((ln->ln_router = is_router) != 0) {
761 * This means a router's state has changed from
762 * non-reachable to probably reachable, and might
763 * affect the status of associated prefixes..
771 * Check if the link-layer address has changed or not.
776 if (ln->la_flags & LLE_VALID) {
777 if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
786 * This is VERY complex. Look at it with care.
788 * override solicit lladdr llchange action
793 * 0 0 y y (1) REACHABLE->STALE
794 * 0 1 n -- (2c) *->REACHABLE
795 * 0 1 y n (2b) L *->REACHABLE
796 * 0 1 y y (1) REACHABLE->STALE
799 * 1 0 y y (2a) L *->STALE
800 * 1 1 n -- (2a) *->REACHABLE
801 * 1 1 y n (2a) L *->REACHABLE
802 * 1 1 y y (2a) L *->REACHABLE
804 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
806 * If state is REACHABLE, make it STALE.
807 * no other updates should be done.
809 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
810 ln->ln_state = ND6_LLINFO_STALE;
811 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
814 } else if (is_override /* (2a) */
815 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
816 || lladdr == NULL) { /* (2c) */
818 * Update link-local address, if any.
820 if (lladdr != NULL) {
821 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
822 ln->la_flags |= LLE_VALID;
823 EVENTHANDLER_INVOKE(lle_event, ln,
828 * If solicited, make the state REACHABLE.
829 * If not solicited and the link-layer address was
830 * changed, make it STALE.
833 ln->ln_state = ND6_LLINFO_REACHABLE;
835 if (!ND6_LLINFO_PERMANENT(ln)) {
836 nd6_llinfo_settimer_locked(ln,
837 (long)ND_IFINFO(ifp)->reachable * hz);
840 if (lladdr != NULL && llchange) {
841 ln->ln_state = ND6_LLINFO_STALE;
842 nd6_llinfo_settimer_locked(ln,
843 (long)V_nd6_gctimer * hz);
848 if (ln->ln_router && !is_router) {
850 * The peer dropped the router flag.
851 * Remove the sender from the Default Router List and
852 * update the Destination Cache entries.
854 struct nd_defrouter *dr;
855 struct in6_addr *in6;
857 in6 = &L3_ADDR_SIN6(ln)->sin6_addr;
860 * Lock to protect the default router list.
861 * XXX: this might be unnecessary, since this function
862 * is only called under the network software interrupt
863 * context. However, we keep it just for safety.
865 dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
868 else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags &
869 ND6_IFF_ACCEPT_RTADV) {
871 * Even if the neighbor is not in the default
872 * router list, the neighbor may be used
873 * as a next hop for some destinations
874 * (e.g. redirect case). So we must
875 * call rt6_flush explicitly.
877 rt6_flush(&ip6->ip6_src, ifp);
880 ln->ln_router = is_router;
884 * rt->rt_flags &= ~RTF_REJECT;
888 struct mbuf *m_hold, *m_hold_next;
891 * reset the la_hold in advance, to explicitly
892 * prevent a la_hold lookup in nd6_output()
893 * (wouldn't happen, though...)
895 for (m_hold = ln->la_hold, ln->la_hold = NULL;
896 m_hold; m_hold = m_hold_next) {
897 m_hold_next = m_hold->m_nextpkt;
898 m_hold->m_nextpkt = NULL;
900 * we assume ifp is not a loopback here, so just set
901 * the 2nd argument as the 1st one.
904 if (send_sendso_input_hook != NULL) {
905 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
906 sizeof(unsigned short), M_NOWAIT);
909 m_tag_prepend(m, mtag);
912 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
918 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
922 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
925 pfxlist_onlink_check();
934 ICMP6STAT_INC(icp6s_badna);
939 * Neighbor advertisement output handling.
943 * the following items are not implemented yet:
944 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
945 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
947 * tlladdr - 1 if include target link-layer address
948 * sdl0 - sockaddr_dl (= proxy NA) or NULL
951 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
952 const struct in6_addr *taddr6, u_long flags, int tlladdr,
953 struct sockaddr *sdl0, u_int fibnum)
959 struct nd_neighbor_advert *nd_na;
960 struct ip6_moptions im6o;
961 struct in6_addr src, daddr6;
962 struct sockaddr_in6 dst_sa;
963 int icmp6len, maxlen, error;
967 bzero(&ro, sizeof(ro));
969 daddr6 = *daddr6_0; /* make a local copy for modification */
971 /* estimate the size of message */
972 maxlen = sizeof(*ip6) + sizeof(*nd_na);
973 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
974 if (max_linkhdr + maxlen >= MCLBYTES) {
976 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
977 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
982 if (max_linkhdr + maxlen > MHLEN)
983 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
985 m = m_gethdr(M_NOWAIT, MT_DATA);
990 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
991 m->m_flags |= M_MCAST;
992 im6o.im6o_multicast_ifp = ifp;
993 im6o.im6o_multicast_hlim = 255;
994 im6o.im6o_multicast_loop = 0;
997 icmp6len = sizeof(*nd_na);
998 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
999 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
1001 /* fill neighbor advertisement packet */
1002 ip6 = mtod(m, struct ip6_hdr *);
1004 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1005 ip6->ip6_vfc |= IPV6_VERSION;
1006 ip6->ip6_nxt = IPPROTO_ICMPV6;
1007 ip6->ip6_hlim = 255;
1008 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1010 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1011 daddr6.s6_addr16[1] = 0;
1012 daddr6.s6_addr32[1] = 0;
1013 daddr6.s6_addr32[2] = 0;
1014 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1015 if (in6_setscope(&daddr6, ifp, NULL))
1018 flags &= ~ND_NA_FLAG_SOLICITED;
1020 ip6->ip6_dst = daddr6;
1021 bzero(&dst_sa, sizeof(struct sockaddr_in6));
1022 dst_sa.sin6_family = AF_INET6;
1023 dst_sa.sin6_len = sizeof(struct sockaddr_in6);
1024 dst_sa.sin6_addr = daddr6;
1027 * Select a source whose scope is the same as that of the dest.
1029 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1031 error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src);
1033 char ip6buf[INET6_ADDRSTRLEN];
1034 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1035 "determined: dst=%s, error=%d\n",
1036 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error));
1040 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1041 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1042 nd_na->nd_na_code = 0;
1043 nd_na->nd_na_target = *taddr6;
1044 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1047 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1048 * see nd6_ns_input() for details.
1049 * Basically, if NS packet is sent to unicast/anycast addr,
1050 * target lladdr option SHOULD NOT be included.
1054 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1055 * lladdr in sdl0. If we are not proxying (sending NA for
1056 * my address) use lladdr configured for the interface.
1060 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1062 mac = nd6_ifptomac(ifp);
1063 } else if (sdl0->sa_family == AF_LINK) {
1064 struct sockaddr_dl *sdl;
1065 sdl = (struct sockaddr_dl *)sdl0;
1066 if (sdl->sdl_alen == ifp->if_addrlen)
1070 if (tlladdr && mac) {
1071 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1072 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1074 /* roundup to 8 bytes alignment! */
1075 optlen = (optlen + 7) & ~7;
1077 m->m_pkthdr.len += optlen;
1080 bzero((caddr_t)nd_opt, optlen);
1081 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1082 nd_opt->nd_opt_len = optlen >> 3;
1083 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1085 flags &= ~ND_NA_FLAG_OVERRIDE;
1087 ip6->ip6_plen = htons((u_short)icmp6len);
1088 nd_na->nd_na_flags_reserved = flags;
1089 nd_na->nd_na_cksum = 0;
1090 nd_na->nd_na_cksum =
1091 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1093 if (send_sendso_input_hook != NULL) {
1094 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1095 sizeof(unsigned short), M_NOWAIT);
1098 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1099 m_tag_prepend(m, mtag);
1102 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
1103 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1104 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1105 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1107 /* We don't cache this route. */
1120 #ifndef BURN_BRIDGES
1122 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1123 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1124 struct sockaddr *sdl0)
1127 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1133 nd6_ifptomac(struct ifnet *ifp)
1135 switch (ifp->if_type) {
1143 #ifdef IFT_IEEE80211
1146 case IFT_INFINIBAND:
1149 return IF_LLADDR(ifp);
1156 TAILQ_ENTRY(dadq) dad_list;
1157 struct ifaddr *dad_ifa;
1158 int dad_count; /* max NS to send */
1159 int dad_ns_tcount; /* # of trials to send NS */
1160 int dad_ns_ocount; /* NS sent so far */
1163 struct callout dad_timer_ch;
1164 struct vnet *dad_vnet;
1167 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1168 VNET_DEFINE(int, dad_init) = 0;
1169 #define V_dadq VNET(dadq)
1170 #define V_dad_init VNET(dad_init)
1172 static struct dadq *
1173 nd6_dad_find(struct ifaddr *ifa)
1177 TAILQ_FOREACH(dp, &V_dadq, dad_list)
1178 if (dp->dad_ifa == ifa)
1185 nd6_dad_starttimer(struct dadq *dp, int ticks)
1188 callout_reset(&dp->dad_timer_ch, ticks,
1189 (void (*)(void *))nd6_dad_timer, (void *)dp);
1193 nd6_dad_stoptimer(struct dadq *dp)
1196 callout_stop(&dp->dad_timer_ch);
1200 * Start Duplicate Address Detection (DAD) for specified interface address.
1203 nd6_dad_start(struct ifaddr *ifa, int delay)
1205 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1207 char ip6buf[INET6_ADDRSTRLEN];
1210 TAILQ_INIT(&V_dadq);
1215 * If we don't need DAD, don't do it.
1216 * There are several cases:
1217 * - DAD is disabled (ip6_dad_count == 0)
1218 * - the interface address is anycast
1220 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1222 "nd6_dad_start: called with non-tentative address "
1224 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1225 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1228 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1229 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1232 if (!V_ip6_dad_count) {
1233 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1236 if (ifa->ifa_ifp == NULL)
1237 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1238 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) {
1241 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)
1243 if (nd6_dad_find(ifa) != NULL) {
1244 /* DAD already in progress */
1248 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1250 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1252 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1253 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1256 bzero(dp, sizeof(*dp));
1257 callout_init(&dp->dad_timer_ch, 0);
1259 dp->dad_vnet = curvnet;
1261 TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list);
1263 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1264 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1267 * Send NS packet for DAD, ip6_dad_count times.
1268 * Note that we must delay the first transmission, if this is the
1269 * first packet to be sent from the interface after interface
1270 * (re)initialization.
1273 ifa_ref(ifa); /* just for safety */
1274 dp->dad_count = V_ip6_dad_count;
1275 dp->dad_ns_icount = dp->dad_na_icount = 0;
1276 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1278 nd6_dad_ns_output(dp, ifa);
1279 nd6_dad_starttimer(dp,
1280 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1282 nd6_dad_starttimer(dp, delay);
1287 * terminate DAD unconditionally. used for address removals.
1290 nd6_dad_stop(struct ifaddr *ifa)
1296 dp = nd6_dad_find(ifa);
1298 /* DAD wasn't started yet */
1302 nd6_dad_stoptimer(dp);
1304 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1311 nd6_dad_timer(struct dadq *dp)
1313 CURVNET_SET(dp->dad_vnet);
1314 struct ifaddr *ifa = dp->dad_ifa;
1315 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1316 char ip6buf[INET6_ADDRSTRLEN];
1320 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1323 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1324 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1326 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1327 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1330 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1331 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1333 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1334 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1338 /* timeouted with IFF_{RUNNING,UP} check */
1339 if (dp->dad_ns_tcount > V_dad_maxtry) {
1340 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1341 if_name(ifa->ifa_ifp)));
1343 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1350 /* Need more checks? */
1351 if (dp->dad_ns_ocount < dp->dad_count) {
1353 * We have more NS to go. Send NS packet for DAD.
1355 nd6_dad_ns_output(dp, ifa);
1356 nd6_dad_starttimer(dp,
1357 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1360 * We have transmitted sufficient number of DAD packets.
1361 * See what we've got.
1367 if (dp->dad_na_icount) {
1369 * the check is in nd6_dad_na_input(),
1375 if (dp->dad_ns_icount) {
1376 /* We've seen NS, means DAD has failed. */
1381 /* (*dp) will be freed in nd6_dad_duplicated() */
1383 nd6_dad_duplicated(ifa);
1386 * We are done with DAD. No NA came, no NS came.
1387 * No duplicate address found.
1389 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1392 "%s: DAD complete for %s - no duplicates found\n",
1393 if_name(ifa->ifa_ifp),
1394 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1396 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1408 nd6_dad_duplicated(struct ifaddr *ifa)
1410 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1413 char ip6buf[INET6_ADDRSTRLEN];
1415 dp = nd6_dad_find(ifa);
1417 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1421 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1422 "NS in/out=%d/%d, NA in=%d\n",
1423 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1424 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1426 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1427 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1429 /* We are done with DAD, with duplicate address found. (failure) */
1430 nd6_dad_stoptimer(dp);
1433 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1434 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1435 log(LOG_ERR, "%s: manual intervention required\n",
1439 * If the address is a link-local address formed from an interface
1440 * identifier based on the hardware address which is supposed to be
1441 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1442 * operation on the interface SHOULD be disabled.
1443 * [RFC 4862, Section 5.4.5]
1445 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1446 struct in6_addr in6;
1449 * To avoid over-reaction, we only apply this logic when we are
1450 * very sure that hardware addresses are supposed to be unique.
1452 switch (ifp->if_type) {
1457 #ifdef IFT_IEEE80211
1460 case IFT_INFINIBAND:
1461 in6 = ia->ia_addr.sin6_addr;
1462 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1463 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1464 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1465 log(LOG_ERR, "%s: possible hardware address "
1466 "duplication detected, disable IPv6\n",
1473 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1480 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1482 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1483 struct ifnet *ifp = ifa->ifa_ifp;
1485 dp->dad_ns_tcount++;
1486 if ((ifp->if_flags & IFF_UP) == 0) {
1489 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1493 dp->dad_ns_ocount++;
1494 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1498 nd6_dad_ns_input(struct ifaddr *ifa)
1500 struct in6_ifaddr *ia;
1502 const struct in6_addr *taddr6;
1507 panic("ifa == NULL in nd6_dad_ns_input");
1509 ia = (struct in6_ifaddr *)ifa;
1511 taddr6 = &ia->ia_addr.sin6_addr;
1513 dp = nd6_dad_find(ifa);
1515 /* Quickhack - completely ignore DAD NS packets */
1516 if (V_dad_ignore_ns) {
1517 char ip6buf[INET6_ADDRSTRLEN];
1519 "nd6_dad_ns_input: ignoring DAD NS packet for "
1520 "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6),
1521 if_name(ifa->ifa_ifp)));
1526 * if I'm yet to start DAD, someone else started using this address
1527 * first. I have a duplicate and you win.
1529 if (dp == NULL || dp->dad_ns_ocount == 0)
1532 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1535 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1536 nd6_dad_duplicated(ifa);
1539 * not sure if I got a duplicate.
1540 * increment ns count and see what happens.
1543 dp->dad_ns_icount++;
1548 nd6_dad_na_input(struct ifaddr *ifa)
1553 panic("ifa == NULL in nd6_dad_na_input");
1555 dp = nd6_dad_find(ifa);
1557 dp->dad_na_icount++;
1559 /* remove the address. */
1560 nd6_dad_duplicated(ifa);