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 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
402 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
403 __func__, max_linkhdr, maxlen, MCLBYTES));
405 MGETHDR(m, M_DONTWAIT, MT_DATA);
406 if (m && max_linkhdr + maxlen >= MHLEN) {
407 MCLGET(m, M_DONTWAIT);
408 if ((m->m_flags & M_EXT) == 0) {
415 m->m_pkthdr.rcvif = NULL;
417 bzero(&ro, sizeof(ro));
419 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
420 m->m_flags |= M_MCAST;
421 im6o.im6o_multicast_ifp = ifp;
422 im6o.im6o_multicast_hlim = 255;
423 im6o.im6o_multicast_loop = 0;
426 icmp6len = sizeof(*nd_ns);
427 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
428 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
430 /* fill neighbor solicitation packet */
431 ip6 = mtod(m, struct ip6_hdr *);
433 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
434 ip6->ip6_vfc |= IPV6_VERSION;
435 /* ip6->ip6_plen will be set later */
436 ip6->ip6_nxt = IPPROTO_ICMPV6;
439 ip6->ip6_dst = *daddr6;
441 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
442 ip6->ip6_dst.s6_addr16[1] = 0;
443 ip6->ip6_dst.s6_addr32[1] = 0;
444 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
445 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
446 ip6->ip6_dst.s6_addr8[12] = 0xff;
447 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
455 * "If the source address of the packet prompting the
456 * solicitation is the same as one of the addresses assigned
457 * to the outgoing interface, that address SHOULD be placed
458 * in the IP Source Address of the outgoing solicitation.
459 * Otherwise, any one of the addresses assigned to the
460 * interface should be used."
462 * We use the source address for the prompting packet
464 * - saddr6 is given from the caller (by giving "ln"), and
465 * - saddr6 belongs to the outgoing interface.
466 * Otherwise, we perform the source address selection as usual.
468 struct in6_addr *hsrc;
473 if (ln->la_hold != NULL) {
474 struct ip6_hdr *hip6; /* hold ip6 */
477 * assuming every packet in la_hold has the same IP
480 hip6 = mtod(ln->la_hold, struct ip6_hdr *);
482 if (sizeof(*hip6) < ln->la_hold->m_len) {
483 ip6->ip6_src = hip6->ip6_src;
484 hsrc = &hip6->ip6_src;
489 if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
491 /* ip6_src set already. */
495 struct sockaddr_in6 dst_sa;
496 struct in6_addr src_in;
499 bzero(&dst_sa, sizeof(dst_sa));
500 dst_sa.sin6_family = AF_INET6;
501 dst_sa.sin6_len = sizeof(dst_sa);
502 dst_sa.sin6_addr = ip6->ip6_dst;
505 error = in6_selectsrc(&dst_sa, NULL,
506 NULL, &ro, NULL, &oifp, &src_in);
508 char ip6buf[INET6_ADDRSTRLEN];
510 "nd6_ns_output: source can't be "
511 "determined: dst=%s, error=%d\n",
512 ip6_sprintf(ip6buf, &dst_sa.sin6_addr),
516 ip6->ip6_src = src_in;
520 * Source address for DAD packet must always be IPv6
521 * unspecified address. (0::0)
522 * We actually don't have to 0-clear the address (we did it
523 * above), but we do so here explicitly to make the intention
526 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
528 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
529 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
530 nd_ns->nd_ns_code = 0;
531 nd_ns->nd_ns_reserved = 0;
532 nd_ns->nd_ns_target = *taddr6;
533 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
536 * Add source link-layer address option.
538 * spec implementation
540 * DAD packet MUST NOT do not add the option
541 * there's no link layer address:
542 * impossible do not add the option
543 * there's link layer address:
544 * Multicast NS MUST add one add the option
545 * Unicast NS SHOULD add one add the option
547 if (!dad && (mac = nd6_ifptomac(ifp))) {
548 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
549 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
550 /* 8 byte alignments... */
551 optlen = (optlen + 7) & ~7;
553 m->m_pkthdr.len += optlen;
556 bzero((caddr_t)nd_opt, optlen);
557 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
558 nd_opt->nd_opt_len = optlen >> 3;
559 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
562 ip6->ip6_plen = htons((u_short)icmp6len);
563 nd_ns->nd_ns_cksum = 0;
565 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
567 if (send_sendso_input_hook != NULL) {
568 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
569 sizeof(unsigned short), M_NOWAIT);
572 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
573 m_tag_prepend(m, mtag);
576 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
577 icmp6_ifstat_inc(ifp, ifs6_out_msg);
578 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
579 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
581 /* We don't cache this route. */
595 * Neighbor advertisement input handling.
598 * Based on RFC 2462 (duplicate address detection)
600 * the following items are not implemented yet:
601 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
602 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
605 nd6_na_input(struct mbuf *m, int off, int icmp6len)
607 struct ifnet *ifp = m->m_pkthdr.rcvif;
608 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
609 struct nd_neighbor_advert *nd_na;
610 struct in6_addr daddr6 = ip6->ip6_dst;
611 struct in6_addr taddr6;
620 struct llentry *ln = NULL;
621 union nd_opts ndopts;
622 struct mbuf *chain = NULL;
624 struct sockaddr_in6 sin6;
625 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
627 if (ip6->ip6_hlim != 255) {
629 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
630 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
631 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
635 #ifndef PULLDOWN_TEST
636 IP6_EXTHDR_CHECK(m, off, icmp6len,);
637 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
639 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
641 ICMP6STAT_INC(icp6s_tooshort);
646 flags = nd_na->nd_na_flags_reserved;
647 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
648 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
649 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
651 taddr6 = nd_na->nd_na_target;
652 if (in6_setscope(&taddr6, ifp, NULL))
653 goto bad; /* XXX: impossible */
655 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
657 "nd6_na_input: invalid target address %s\n",
658 ip6_sprintf(ip6bufs, &taddr6)));
661 if (IN6_IS_ADDR_MULTICAST(&daddr6))
664 "nd6_na_input: a solicited adv is multicasted\n"));
668 icmp6len -= sizeof(*nd_na);
669 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
670 if (nd6_options(&ndopts) < 0) {
672 "nd6_na_input: invalid ND option, ignored\n"));
673 /* nd6_options have incremented stats */
677 if (ndopts.nd_opts_tgt_lladdr) {
678 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
679 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
682 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
685 * Target address matches one of my interface address.
687 * If my address is tentative, this means that there's somebody
688 * already using the same address as mine. This indicates DAD failure.
689 * This is defined in RFC 2462.
691 * Otherwise, process as defined in RFC 2461.
694 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
695 nd6_dad_na_input(ifa);
700 /* Just for safety, maybe unnecessary. */
704 "nd6_na_input: duplicate IP6 address %s\n",
705 ip6_sprintf(ip6bufs, &taddr6));
709 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
710 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
711 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
712 ifp->if_addrlen, lladdrlen - 2));
717 * If no neighbor cache entry is found, NA SHOULD silently be
720 IF_AFDATA_RLOCK(ifp);
721 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
722 IF_AFDATA_RUNLOCK(ifp);
727 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
729 * If the link-layer has address, and no lladdr option came,
730 * discard the packet.
732 if (ifp->if_addrlen && lladdr == NULL) {
737 * Record link-layer address, and update the state.
739 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
740 ln->la_flags |= LLE_VALID;
741 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
743 ln->ln_state = ND6_LLINFO_REACHABLE;
745 if (!ND6_LLINFO_PERMANENT(ln)) {
746 nd6_llinfo_settimer_locked(ln,
747 (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz);
750 ln->ln_state = ND6_LLINFO_STALE;
751 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
753 if ((ln->ln_router = is_router) != 0) {
755 * This means a router's state has changed from
756 * non-reachable to probably reachable, and might
757 * affect the status of associated prefixes..
765 * Check if the link-layer address has changed or not.
770 if (ln->la_flags & LLE_VALID) {
771 if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
780 * This is VERY complex. Look at it with care.
782 * override solicit lladdr llchange action
787 * 0 0 y y (1) REACHABLE->STALE
788 * 0 1 n -- (2c) *->REACHABLE
789 * 0 1 y n (2b) L *->REACHABLE
790 * 0 1 y y (1) REACHABLE->STALE
793 * 1 0 y y (2a) L *->STALE
794 * 1 1 n -- (2a) *->REACHABLE
795 * 1 1 y n (2a) L *->REACHABLE
796 * 1 1 y y (2a) L *->REACHABLE
798 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
800 * If state is REACHABLE, make it STALE.
801 * no other updates should be done.
803 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
804 ln->ln_state = ND6_LLINFO_STALE;
805 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
808 } else if (is_override /* (2a) */
809 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
810 || lladdr == NULL) { /* (2c) */
812 * Update link-local address, if any.
814 if (lladdr != NULL) {
815 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
816 ln->la_flags |= LLE_VALID;
817 EVENTHANDLER_INVOKE(lle_event, ln,
822 * If solicited, make the state REACHABLE.
823 * If not solicited and the link-layer address was
824 * changed, make it STALE.
827 ln->ln_state = ND6_LLINFO_REACHABLE;
829 if (!ND6_LLINFO_PERMANENT(ln)) {
830 nd6_llinfo_settimer_locked(ln,
831 (long)ND_IFINFO(ifp)->reachable * hz);
834 if (lladdr != NULL && llchange) {
835 ln->ln_state = ND6_LLINFO_STALE;
836 nd6_llinfo_settimer_locked(ln,
837 (long)V_nd6_gctimer * hz);
842 if (ln->ln_router && !is_router) {
844 * The peer dropped the router flag.
845 * Remove the sender from the Default Router List and
846 * update the Destination Cache entries.
848 struct nd_defrouter *dr;
849 struct in6_addr *in6;
851 in6 = &L3_ADDR_SIN6(ln)->sin6_addr;
854 * Lock to protect the default router list.
855 * XXX: this might be unnecessary, since this function
856 * is only called under the network software interrupt
857 * context. However, we keep it just for safety.
859 dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
862 else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags &
863 ND6_IFF_ACCEPT_RTADV) {
865 * Even if the neighbor is not in the default
866 * router list, the neighbor may be used
867 * as a next hop for some destinations
868 * (e.g. redirect case). So we must
869 * call rt6_flush explicitly.
871 rt6_flush(&ip6->ip6_src, ifp);
874 ln->ln_router = is_router;
878 * rt->rt_flags &= ~RTF_REJECT;
882 struct mbuf *m_hold, *m_hold_next;
885 * reset the la_hold in advance, to explicitly
886 * prevent a la_hold lookup in nd6_output()
887 * (wouldn't happen, though...)
889 for (m_hold = ln->la_hold, ln->la_hold = NULL;
890 m_hold; m_hold = m_hold_next) {
891 m_hold_next = m_hold->m_nextpkt;
892 m_hold->m_nextpkt = NULL;
894 * we assume ifp is not a loopback here, so just set
895 * the 2nd argument as the 1st one.
898 if (send_sendso_input_hook != NULL) {
899 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
900 sizeof(unsigned short), M_NOWAIT);
903 m_tag_prepend(m, mtag);
906 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
912 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
916 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
919 pfxlist_onlink_check();
928 ICMP6STAT_INC(icp6s_badna);
933 * Neighbor advertisement output handling.
937 * the following items are not implemented yet:
938 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
939 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
941 * tlladdr - 1 if include target link-layer address
942 * sdl0 - sockaddr_dl (= proxy NA) or NULL
945 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
946 const struct in6_addr *taddr6, u_long flags, int tlladdr,
947 struct sockaddr *sdl0, u_int fibnum)
953 struct nd_neighbor_advert *nd_na;
954 struct ip6_moptions im6o;
955 struct in6_addr src, daddr6;
956 struct sockaddr_in6 dst_sa;
957 int icmp6len, maxlen, error;
961 bzero(&ro, sizeof(ro));
963 daddr6 = *daddr6_0; /* make a local copy for modification */
965 /* estimate the size of message */
966 maxlen = sizeof(*ip6) + sizeof(*nd_na);
967 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
968 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
969 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
970 __func__, max_linkhdr, maxlen, MCLBYTES));
972 MGETHDR(m, M_DONTWAIT, MT_DATA);
973 if (m && max_linkhdr + maxlen >= MHLEN) {
974 MCLGET(m, M_DONTWAIT);
975 if ((m->m_flags & M_EXT) == 0) {
982 m->m_pkthdr.rcvif = NULL;
985 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
986 m->m_flags |= M_MCAST;
987 im6o.im6o_multicast_ifp = ifp;
988 im6o.im6o_multicast_hlim = 255;
989 im6o.im6o_multicast_loop = 0;
992 icmp6len = sizeof(*nd_na);
993 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
994 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
996 /* fill neighbor advertisement packet */
997 ip6 = mtod(m, struct ip6_hdr *);
999 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1000 ip6->ip6_vfc |= IPV6_VERSION;
1001 ip6->ip6_nxt = IPPROTO_ICMPV6;
1002 ip6->ip6_hlim = 255;
1003 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1005 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1006 daddr6.s6_addr16[1] = 0;
1007 daddr6.s6_addr32[1] = 0;
1008 daddr6.s6_addr32[2] = 0;
1009 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1010 if (in6_setscope(&daddr6, ifp, NULL))
1013 flags &= ~ND_NA_FLAG_SOLICITED;
1015 ip6->ip6_dst = daddr6;
1016 bzero(&dst_sa, sizeof(struct sockaddr_in6));
1017 dst_sa.sin6_family = AF_INET6;
1018 dst_sa.sin6_len = sizeof(struct sockaddr_in6);
1019 dst_sa.sin6_addr = daddr6;
1022 * Select a source whose scope is the same as that of the dest.
1024 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1026 error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src);
1028 char ip6buf[INET6_ADDRSTRLEN];
1029 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1030 "determined: dst=%s, error=%d\n",
1031 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error));
1035 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1036 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1037 nd_na->nd_na_code = 0;
1038 nd_na->nd_na_target = *taddr6;
1039 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1042 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1043 * see nd6_ns_input() for details.
1044 * Basically, if NS packet is sent to unicast/anycast addr,
1045 * target lladdr option SHOULD NOT be included.
1049 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1050 * lladdr in sdl0. If we are not proxying (sending NA for
1051 * my address) use lladdr configured for the interface.
1055 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1057 mac = nd6_ifptomac(ifp);
1058 } else if (sdl0->sa_family == AF_LINK) {
1059 struct sockaddr_dl *sdl;
1060 sdl = (struct sockaddr_dl *)sdl0;
1061 if (sdl->sdl_alen == ifp->if_addrlen)
1065 if (tlladdr && mac) {
1066 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1067 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1069 /* roundup to 8 bytes alignment! */
1070 optlen = (optlen + 7) & ~7;
1072 m->m_pkthdr.len += optlen;
1075 bzero((caddr_t)nd_opt, optlen);
1076 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1077 nd_opt->nd_opt_len = optlen >> 3;
1078 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1080 flags &= ~ND_NA_FLAG_OVERRIDE;
1082 ip6->ip6_plen = htons((u_short)icmp6len);
1083 nd_na->nd_na_flags_reserved = flags;
1084 nd_na->nd_na_cksum = 0;
1085 nd_na->nd_na_cksum =
1086 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1088 if (send_sendso_input_hook != NULL) {
1089 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1090 sizeof(unsigned short), M_NOWAIT);
1093 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1094 m_tag_prepend(m, mtag);
1097 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
1098 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1099 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1100 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1102 /* We don't cache this route. */
1115 #ifndef BURN_BRIDGES
1117 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1118 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1119 struct sockaddr *sdl0)
1122 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1128 nd6_ifptomac(struct ifnet *ifp)
1130 switch (ifp->if_type) {
1138 #ifdef IFT_IEEE80211
1144 case IFT_INFINIBAND:
1147 return IF_LLADDR(ifp);
1154 TAILQ_ENTRY(dadq) dad_list;
1155 struct ifaddr *dad_ifa;
1156 int dad_count; /* max NS to send */
1157 int dad_ns_tcount; /* # of trials to send NS */
1158 int dad_ns_ocount; /* NS sent so far */
1161 struct callout dad_timer_ch;
1162 struct vnet *dad_vnet;
1165 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1166 VNET_DEFINE(int, dad_init) = 0;
1167 #define V_dadq VNET(dadq)
1168 #define V_dad_init VNET(dad_init)
1170 static struct dadq *
1171 nd6_dad_find(struct ifaddr *ifa)
1175 TAILQ_FOREACH(dp, &V_dadq, dad_list)
1176 if (dp->dad_ifa == ifa)
1183 nd6_dad_starttimer(struct dadq *dp, int ticks)
1186 callout_reset(&dp->dad_timer_ch, ticks,
1187 (void (*)(void *))nd6_dad_timer, (void *)dp);
1191 nd6_dad_stoptimer(struct dadq *dp)
1194 callout_stop(&dp->dad_timer_ch);
1198 * Start Duplicate Address Detection (DAD) for specified interface address.
1201 nd6_dad_start(struct ifaddr *ifa, int delay)
1203 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1205 char ip6buf[INET6_ADDRSTRLEN];
1208 TAILQ_INIT(&V_dadq);
1213 * If we don't need DAD, don't do it.
1214 * There are several cases:
1215 * - DAD is disabled (ip6_dad_count == 0)
1216 * - the interface address is anycast
1218 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1220 "nd6_dad_start: called with non-tentative address "
1222 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1223 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1226 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1227 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1230 if (!V_ip6_dad_count) {
1231 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1234 if (ifa->ifa_ifp == NULL)
1235 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1236 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) {
1239 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)
1241 if (nd6_dad_find(ifa) != NULL) {
1242 /* DAD already in progress */
1246 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1248 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1250 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1251 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1254 bzero(dp, sizeof(*dp));
1255 callout_init(&dp->dad_timer_ch, 0);
1257 dp->dad_vnet = curvnet;
1259 TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list);
1261 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1262 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1265 * Send NS packet for DAD, ip6_dad_count times.
1266 * Note that we must delay the first transmission, if this is the
1267 * first packet to be sent from the interface after interface
1268 * (re)initialization.
1271 ifa_ref(ifa); /* just for safety */
1272 dp->dad_count = V_ip6_dad_count;
1273 dp->dad_ns_icount = dp->dad_na_icount = 0;
1274 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1276 nd6_dad_ns_output(dp, ifa);
1277 nd6_dad_starttimer(dp,
1278 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1280 nd6_dad_starttimer(dp, delay);
1285 * terminate DAD unconditionally. used for address removals.
1288 nd6_dad_stop(struct ifaddr *ifa)
1294 dp = nd6_dad_find(ifa);
1296 /* DAD wasn't started yet */
1300 nd6_dad_stoptimer(dp);
1302 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1309 nd6_dad_timer(struct dadq *dp)
1311 CURVNET_SET(dp->dad_vnet);
1313 struct ifaddr *ifa = dp->dad_ifa;
1314 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1315 char ip6buf[INET6_ADDRSTRLEN];
1317 s = splnet(); /* XXX */
1321 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1324 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1325 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1327 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1328 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1331 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1332 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1334 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1335 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1339 /* timeouted with IFF_{RUNNING,UP} check */
1340 if (dp->dad_ns_tcount > V_dad_maxtry) {
1341 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1342 if_name(ifa->ifa_ifp)));
1344 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1351 /* Need more checks? */
1352 if (dp->dad_ns_ocount < dp->dad_count) {
1354 * We have more NS to go. Send NS packet for DAD.
1356 nd6_dad_ns_output(dp, ifa);
1357 nd6_dad_starttimer(dp,
1358 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1361 * We have transmitted sufficient number of DAD packets.
1362 * See what we've got.
1368 if (dp->dad_na_icount) {
1370 * the check is in nd6_dad_na_input(),
1376 if (dp->dad_ns_icount) {
1377 /* We've seen NS, means DAD has failed. */
1382 /* (*dp) will be freed in nd6_dad_duplicated() */
1384 nd6_dad_duplicated(ifa);
1387 * We are done with DAD. No NA came, no NS came.
1388 * No duplicate address found.
1390 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1393 "%s: DAD complete for %s - no duplicates found\n",
1394 if_name(ifa->ifa_ifp),
1395 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1397 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1410 nd6_dad_duplicated(struct ifaddr *ifa)
1412 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1415 char ip6buf[INET6_ADDRSTRLEN];
1417 dp = nd6_dad_find(ifa);
1419 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1423 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1424 "NS in/out=%d/%d, NA in=%d\n",
1425 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1426 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1428 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1429 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1431 /* We are done with DAD, with duplicate address found. (failure) */
1432 nd6_dad_stoptimer(dp);
1435 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1436 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1437 log(LOG_ERR, "%s: manual intervention required\n",
1441 * If the address is a link-local address formed from an interface
1442 * identifier based on the hardware address which is supposed to be
1443 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1444 * operation on the interface SHOULD be disabled.
1445 * [RFC 4862, Section 5.4.5]
1447 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1448 struct in6_addr in6;
1451 * To avoid over-reaction, we only apply this logic when we are
1452 * very sure that hardware addresses are supposed to be unique.
1454 switch (ifp->if_type) {
1459 #ifdef IFT_IEEE80211
1462 case IFT_INFINIBAND:
1463 in6 = ia->ia_addr.sin6_addr;
1464 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1465 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1466 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1467 log(LOG_ERR, "%s: possible hardware address "
1468 "duplication detected, disable IPv6\n",
1475 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1482 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1484 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1485 struct ifnet *ifp = ifa->ifa_ifp;
1487 dp->dad_ns_tcount++;
1488 if ((ifp->if_flags & IFF_UP) == 0) {
1491 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1495 dp->dad_ns_ocount++;
1496 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1500 nd6_dad_ns_input(struct ifaddr *ifa)
1502 struct in6_ifaddr *ia;
1504 const struct in6_addr *taddr6;
1509 panic("ifa == NULL in nd6_dad_ns_input");
1511 ia = (struct in6_ifaddr *)ifa;
1513 taddr6 = &ia->ia_addr.sin6_addr;
1515 dp = nd6_dad_find(ifa);
1517 /* Quickhack - completely ignore DAD NS packets */
1518 if (V_dad_ignore_ns) {
1519 char ip6buf[INET6_ADDRSTRLEN];
1521 "nd6_dad_ns_input: ignoring DAD NS packet for "
1522 "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6),
1523 if_name(ifa->ifa_ifp)));
1528 * if I'm yet to start DAD, someone else started using this address
1529 * first. I have a duplicate and you win.
1531 if (dp == NULL || dp->dad_ns_ocount == 0)
1534 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1537 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1538 nd6_dad_duplicated(ifa);
1541 * not sure if I got a duplicate.
1542 * increment ns count and see what happens.
1545 dp->dad_ns_icount++;
1550 nd6_dad_na_input(struct ifaddr *ifa)
1555 panic("ifa == NULL in nd6_dad_na_input");
1557 dp = nd6_dad_find(ifa);
1559 dp->dad_na_icount++;
1561 /* remove the address. */
1562 nd6_dad_duplicated(ifa);