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 MGETHDR(m, M_DONTWAIT, MT_DATA);
410 if (m && max_linkhdr + maxlen >= MHLEN) {
411 MCLGET(m, M_DONTWAIT);
412 if ((m->m_flags & M_EXT) == 0) {
419 m->m_pkthdr.rcvif = NULL;
421 bzero(&ro, sizeof(ro));
423 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
424 m->m_flags |= M_MCAST;
425 im6o.im6o_multicast_ifp = ifp;
426 im6o.im6o_multicast_hlim = 255;
427 im6o.im6o_multicast_loop = 0;
430 icmp6len = sizeof(*nd_ns);
431 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
432 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
434 /* fill neighbor solicitation packet */
435 ip6 = mtod(m, struct ip6_hdr *);
437 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
438 ip6->ip6_vfc |= IPV6_VERSION;
439 /* ip6->ip6_plen will be set later */
440 ip6->ip6_nxt = IPPROTO_ICMPV6;
443 ip6->ip6_dst = *daddr6;
445 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
446 ip6->ip6_dst.s6_addr16[1] = 0;
447 ip6->ip6_dst.s6_addr32[1] = 0;
448 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
449 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
450 ip6->ip6_dst.s6_addr8[12] = 0xff;
451 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
459 * "If the source address of the packet prompting the
460 * solicitation is the same as one of the addresses assigned
461 * to the outgoing interface, that address SHOULD be placed
462 * in the IP Source Address of the outgoing solicitation.
463 * Otherwise, any one of the addresses assigned to the
464 * interface should be used."
466 * We use the source address for the prompting packet
468 * - saddr6 is given from the caller (by giving "ln"), and
469 * - saddr6 belongs to the outgoing interface.
470 * Otherwise, we perform the source address selection as usual.
472 struct in6_addr *hsrc;
477 if (ln->la_hold != NULL) {
478 struct ip6_hdr *hip6; /* hold ip6 */
481 * assuming every packet in la_hold has the same IP
484 hip6 = mtod(ln->la_hold, struct ip6_hdr *);
486 if (sizeof(*hip6) < ln->la_hold->m_len) {
487 ip6->ip6_src = hip6->ip6_src;
488 hsrc = &hip6->ip6_src;
493 if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
495 /* ip6_src set already. */
499 struct sockaddr_in6 dst_sa;
500 struct in6_addr src_in;
503 bzero(&dst_sa, sizeof(dst_sa));
504 dst_sa.sin6_family = AF_INET6;
505 dst_sa.sin6_len = sizeof(dst_sa);
506 dst_sa.sin6_addr = ip6->ip6_dst;
509 error = in6_selectsrc(&dst_sa, NULL,
510 NULL, &ro, NULL, &oifp, &src_in);
512 char ip6buf[INET6_ADDRSTRLEN];
514 "nd6_ns_output: source can't be "
515 "determined: dst=%s, error=%d\n",
516 ip6_sprintf(ip6buf, &dst_sa.sin6_addr),
520 ip6->ip6_src = src_in;
524 * Source address for DAD packet must always be IPv6
525 * unspecified address. (0::0)
526 * We actually don't have to 0-clear the address (we did it
527 * above), but we do so here explicitly to make the intention
530 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
532 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
533 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
534 nd_ns->nd_ns_code = 0;
535 nd_ns->nd_ns_reserved = 0;
536 nd_ns->nd_ns_target = *taddr6;
537 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
540 * Add source link-layer address option.
542 * spec implementation
544 * DAD packet MUST NOT do not add the option
545 * there's no link layer address:
546 * impossible do not add the option
547 * there's link layer address:
548 * Multicast NS MUST add one add the option
549 * Unicast NS SHOULD add one add the option
551 if (!dad && (mac = nd6_ifptomac(ifp))) {
552 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
553 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
554 /* 8 byte alignments... */
555 optlen = (optlen + 7) & ~7;
557 m->m_pkthdr.len += optlen;
560 bzero((caddr_t)nd_opt, optlen);
561 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
562 nd_opt->nd_opt_len = optlen >> 3;
563 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
566 ip6->ip6_plen = htons((u_short)icmp6len);
567 nd_ns->nd_ns_cksum = 0;
569 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
571 if (send_sendso_input_hook != NULL) {
572 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
573 sizeof(unsigned short), M_NOWAIT);
576 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
577 m_tag_prepend(m, mtag);
580 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
581 icmp6_ifstat_inc(ifp, ifs6_out_msg);
582 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
583 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
585 /* We don't cache this route. */
599 * Neighbor advertisement input handling.
602 * Based on RFC 2462 (duplicate address detection)
604 * the following items are not implemented yet:
605 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
606 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
609 nd6_na_input(struct mbuf *m, int off, int icmp6len)
611 struct ifnet *ifp = m->m_pkthdr.rcvif;
612 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
613 struct nd_neighbor_advert *nd_na;
614 struct in6_addr daddr6 = ip6->ip6_dst;
615 struct in6_addr taddr6;
624 struct llentry *ln = NULL;
625 union nd_opts ndopts;
626 struct mbuf *chain = NULL;
628 struct sockaddr_in6 sin6;
629 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
631 if (ip6->ip6_hlim != 255) {
633 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
634 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
635 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
639 #ifndef PULLDOWN_TEST
640 IP6_EXTHDR_CHECK(m, off, icmp6len,);
641 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
643 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
645 ICMP6STAT_INC(icp6s_tooshort);
650 flags = nd_na->nd_na_flags_reserved;
651 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
652 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
653 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
655 taddr6 = nd_na->nd_na_target;
656 if (in6_setscope(&taddr6, ifp, NULL))
657 goto bad; /* XXX: impossible */
659 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
661 "nd6_na_input: invalid target address %s\n",
662 ip6_sprintf(ip6bufs, &taddr6)));
665 if (IN6_IS_ADDR_MULTICAST(&daddr6))
668 "nd6_na_input: a solicited adv is multicasted\n"));
672 icmp6len -= sizeof(*nd_na);
673 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
674 if (nd6_options(&ndopts) < 0) {
676 "nd6_na_input: invalid ND option, ignored\n"));
677 /* nd6_options have incremented stats */
681 if (ndopts.nd_opts_tgt_lladdr) {
682 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
683 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
686 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
689 * Target address matches one of my interface address.
691 * If my address is tentative, this means that there's somebody
692 * already using the same address as mine. This indicates DAD failure.
693 * This is defined in RFC 2462.
695 * Otherwise, process as defined in RFC 2461.
698 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
700 nd6_dad_na_input(ifa);
704 /* Just for safety, maybe unnecessary. */
708 "nd6_na_input: duplicate IP6 address %s\n",
709 ip6_sprintf(ip6bufs, &taddr6));
713 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
714 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
715 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
716 ifp->if_addrlen, lladdrlen - 2));
721 * If no neighbor cache entry is found, NA SHOULD silently be
724 IF_AFDATA_RLOCK(ifp);
725 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
726 IF_AFDATA_RUNLOCK(ifp);
731 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
733 * If the link-layer has address, and no lladdr option came,
734 * discard the packet.
736 if (ifp->if_addrlen && lladdr == NULL) {
741 * Record link-layer address, and update the state.
743 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
744 ln->la_flags |= LLE_VALID;
745 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
747 ln->ln_state = ND6_LLINFO_REACHABLE;
749 if (!ND6_LLINFO_PERMANENT(ln)) {
750 nd6_llinfo_settimer_locked(ln,
751 (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz);
754 ln->ln_state = ND6_LLINFO_STALE;
755 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
757 if ((ln->ln_router = is_router) != 0) {
759 * This means a router's state has changed from
760 * non-reachable to probably reachable, and might
761 * affect the status of associated prefixes..
769 * Check if the link-layer address has changed or not.
774 if (ln->la_flags & LLE_VALID) {
775 if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
784 * This is VERY complex. Look at it with care.
786 * override solicit lladdr llchange action
791 * 0 0 y y (1) REACHABLE->STALE
792 * 0 1 n -- (2c) *->REACHABLE
793 * 0 1 y n (2b) L *->REACHABLE
794 * 0 1 y y (1) REACHABLE->STALE
797 * 1 0 y y (2a) L *->STALE
798 * 1 1 n -- (2a) *->REACHABLE
799 * 1 1 y n (2a) L *->REACHABLE
800 * 1 1 y y (2a) L *->REACHABLE
802 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
804 * If state is REACHABLE, make it STALE.
805 * no other updates should be done.
807 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
808 ln->ln_state = ND6_LLINFO_STALE;
809 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
812 } else if (is_override /* (2a) */
813 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
814 || lladdr == NULL) { /* (2c) */
816 * Update link-local address, if any.
818 if (lladdr != NULL) {
819 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
820 ln->la_flags |= LLE_VALID;
821 EVENTHANDLER_INVOKE(lle_event, ln,
826 * If solicited, make the state REACHABLE.
827 * If not solicited and the link-layer address was
828 * changed, make it STALE.
831 ln->ln_state = ND6_LLINFO_REACHABLE;
833 if (!ND6_LLINFO_PERMANENT(ln)) {
834 nd6_llinfo_settimer_locked(ln,
835 (long)ND_IFINFO(ifp)->reachable * hz);
838 if (lladdr != NULL && llchange) {
839 ln->ln_state = ND6_LLINFO_STALE;
840 nd6_llinfo_settimer_locked(ln,
841 (long)V_nd6_gctimer * hz);
846 if (ln->ln_router && !is_router) {
848 * The peer dropped the router flag.
849 * Remove the sender from the Default Router List and
850 * update the Destination Cache entries.
852 struct nd_defrouter *dr;
853 struct in6_addr *in6;
855 in6 = &L3_ADDR_SIN6(ln)->sin6_addr;
858 * Lock to protect the default router list.
859 * XXX: this might be unnecessary, since this function
860 * is only called under the network software interrupt
861 * context. However, we keep it just for safety.
863 dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
866 else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags &
867 ND6_IFF_ACCEPT_RTADV) {
869 * Even if the neighbor is not in the default
870 * router list, the neighbor may be used
871 * as a next hop for some destinations
872 * (e.g. redirect case). So we must
873 * call rt6_flush explicitly.
875 rt6_flush(&ip6->ip6_src, ifp);
878 ln->ln_router = is_router;
882 * rt->rt_flags &= ~RTF_REJECT;
886 struct mbuf *m_hold, *m_hold_next;
889 * reset the la_hold in advance, to explicitly
890 * prevent a la_hold lookup in nd6_output()
891 * (wouldn't happen, though...)
893 for (m_hold = ln->la_hold, ln->la_hold = NULL;
894 m_hold; m_hold = m_hold_next) {
895 m_hold_next = m_hold->m_nextpkt;
896 m_hold->m_nextpkt = NULL;
898 * we assume ifp is not a loopback here, so just set
899 * the 2nd argument as the 1st one.
902 if (send_sendso_input_hook != NULL) {
903 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
904 sizeof(unsigned short), M_NOWAIT);
907 m_tag_prepend(m, mtag);
910 nd6_output_lle(ifp, ifp, m_hold, L3_ADDR_SIN6(ln), NULL, ln, &chain);
916 memcpy(&sin6, L3_ADDR_SIN6(ln), sizeof(sin6));
920 nd6_output_flush(ifp, ifp, chain, &sin6, NULL);
923 pfxlist_onlink_check();
932 ICMP6STAT_INC(icp6s_badna);
937 * Neighbor advertisement output handling.
941 * the following items are not implemented yet:
942 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
943 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
945 * tlladdr - 1 if include target link-layer address
946 * sdl0 - sockaddr_dl (= proxy NA) or NULL
949 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
950 const struct in6_addr *taddr6, u_long flags, int tlladdr,
951 struct sockaddr *sdl0, u_int fibnum)
957 struct nd_neighbor_advert *nd_na;
958 struct ip6_moptions im6o;
959 struct in6_addr src, daddr6;
960 struct sockaddr_in6 dst_sa;
961 int icmp6len, maxlen, error;
965 bzero(&ro, sizeof(ro));
967 daddr6 = *daddr6_0; /* make a local copy for modification */
969 /* estimate the size of message */
970 maxlen = sizeof(*ip6) + sizeof(*nd_na);
971 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
972 if (max_linkhdr + maxlen >= MCLBYTES) {
974 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
975 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
980 MGETHDR(m, M_DONTWAIT, MT_DATA);
981 if (m && max_linkhdr + maxlen >= MHLEN) {
982 MCLGET(m, M_DONTWAIT);
983 if ((m->m_flags & M_EXT) == 0) {
990 m->m_pkthdr.rcvif = NULL;
993 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
994 m->m_flags |= M_MCAST;
995 im6o.im6o_multicast_ifp = ifp;
996 im6o.im6o_multicast_hlim = 255;
997 im6o.im6o_multicast_loop = 0;
1000 icmp6len = sizeof(*nd_na);
1001 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
1002 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
1004 /* fill neighbor advertisement packet */
1005 ip6 = mtod(m, struct ip6_hdr *);
1007 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1008 ip6->ip6_vfc |= IPV6_VERSION;
1009 ip6->ip6_nxt = IPPROTO_ICMPV6;
1010 ip6->ip6_hlim = 255;
1011 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1013 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1014 daddr6.s6_addr16[1] = 0;
1015 daddr6.s6_addr32[1] = 0;
1016 daddr6.s6_addr32[2] = 0;
1017 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1018 if (in6_setscope(&daddr6, ifp, NULL))
1021 flags &= ~ND_NA_FLAG_SOLICITED;
1023 ip6->ip6_dst = daddr6;
1024 bzero(&dst_sa, sizeof(struct sockaddr_in6));
1025 dst_sa.sin6_family = AF_INET6;
1026 dst_sa.sin6_len = sizeof(struct sockaddr_in6);
1027 dst_sa.sin6_addr = daddr6;
1030 * Select a source whose scope is the same as that of the dest.
1032 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1034 error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src);
1036 char ip6buf[INET6_ADDRSTRLEN];
1037 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1038 "determined: dst=%s, error=%d\n",
1039 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error));
1043 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1044 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1045 nd_na->nd_na_code = 0;
1046 nd_na->nd_na_target = *taddr6;
1047 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1050 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1051 * see nd6_ns_input() for details.
1052 * Basically, if NS packet is sent to unicast/anycast addr,
1053 * target lladdr option SHOULD NOT be included.
1057 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1058 * lladdr in sdl0. If we are not proxying (sending NA for
1059 * my address) use lladdr configured for the interface.
1063 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1065 mac = nd6_ifptomac(ifp);
1066 } else if (sdl0->sa_family == AF_LINK) {
1067 struct sockaddr_dl *sdl;
1068 sdl = (struct sockaddr_dl *)sdl0;
1069 if (sdl->sdl_alen == ifp->if_addrlen)
1073 if (tlladdr && mac) {
1074 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1075 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1077 /* roundup to 8 bytes alignment! */
1078 optlen = (optlen + 7) & ~7;
1080 m->m_pkthdr.len += optlen;
1083 bzero((caddr_t)nd_opt, optlen);
1084 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1085 nd_opt->nd_opt_len = optlen >> 3;
1086 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1088 flags &= ~ND_NA_FLAG_OVERRIDE;
1090 ip6->ip6_plen = htons((u_short)icmp6len);
1091 nd_na->nd_na_flags_reserved = flags;
1092 nd_na->nd_na_cksum = 0;
1093 nd_na->nd_na_cksum =
1094 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1096 if (send_sendso_input_hook != NULL) {
1097 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1098 sizeof(unsigned short), M_NOWAIT);
1101 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1102 m_tag_prepend(m, mtag);
1105 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
1106 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1107 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1108 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1110 /* We don't cache this route. */
1123 #ifndef BURN_BRIDGES
1125 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1126 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1127 struct sockaddr *sdl0)
1130 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1136 nd6_ifptomac(struct ifnet *ifp)
1138 switch (ifp->if_type) {
1146 #ifdef IFT_IEEE80211
1152 case IFT_INFINIBAND:
1155 return IF_LLADDR(ifp);
1162 TAILQ_ENTRY(dadq) dad_list;
1163 struct ifaddr *dad_ifa;
1164 int dad_count; /* max NS to send */
1165 int dad_ns_tcount; /* # of trials to send NS */
1166 int dad_ns_ocount; /* NS sent so far */
1169 struct callout dad_timer_ch;
1170 struct vnet *dad_vnet;
1173 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1174 VNET_DEFINE(int, dad_init) = 0;
1175 #define V_dadq VNET(dadq)
1176 #define V_dad_init VNET(dad_init)
1178 static struct dadq *
1179 nd6_dad_find(struct ifaddr *ifa)
1183 TAILQ_FOREACH(dp, &V_dadq, dad_list)
1184 if (dp->dad_ifa == ifa)
1191 nd6_dad_starttimer(struct dadq *dp, int ticks)
1194 callout_reset(&dp->dad_timer_ch, ticks,
1195 (void (*)(void *))nd6_dad_timer, (void *)dp);
1199 nd6_dad_stoptimer(struct dadq *dp)
1202 callout_stop(&dp->dad_timer_ch);
1206 * Start Duplicate Address Detection (DAD) for specified interface address.
1209 nd6_dad_start(struct ifaddr *ifa, int delay)
1211 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1213 char ip6buf[INET6_ADDRSTRLEN];
1216 TAILQ_INIT(&V_dadq);
1221 * If we don't need DAD, don't do it.
1222 * There are several cases:
1223 * - DAD is disabled (ip6_dad_count == 0)
1224 * - the interface address is anycast
1226 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1228 "nd6_dad_start: called with non-tentative address "
1230 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1231 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1234 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1235 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1238 if (!V_ip6_dad_count) {
1239 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1242 if (ifa->ifa_ifp == NULL)
1243 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1244 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) {
1247 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)
1249 if (nd6_dad_find(ifa) != NULL) {
1250 /* DAD already in progress */
1254 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1256 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1258 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1259 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1262 bzero(dp, sizeof(*dp));
1263 callout_init(&dp->dad_timer_ch, 0);
1265 dp->dad_vnet = curvnet;
1267 TAILQ_INSERT_TAIL(&V_dadq, (struct dadq *)dp, dad_list);
1269 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1270 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1273 * Send NS packet for DAD, ip6_dad_count times.
1274 * Note that we must delay the first transmission, if this is the
1275 * first packet to be sent from the interface after interface
1276 * (re)initialization.
1279 ifa_ref(ifa); /* just for safety */
1280 dp->dad_count = V_ip6_dad_count;
1281 dp->dad_ns_icount = dp->dad_na_icount = 0;
1282 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1284 nd6_dad_ns_output(dp, ifa);
1285 nd6_dad_starttimer(dp,
1286 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1288 nd6_dad_starttimer(dp, delay);
1293 * terminate DAD unconditionally. used for address removals.
1296 nd6_dad_stop(struct ifaddr *ifa)
1302 dp = nd6_dad_find(ifa);
1304 /* DAD wasn't started yet */
1308 nd6_dad_stoptimer(dp);
1310 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1317 nd6_dad_timer(struct dadq *dp)
1319 CURVNET_SET(dp->dad_vnet);
1321 struct ifaddr *ifa = dp->dad_ifa;
1322 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1323 char ip6buf[INET6_ADDRSTRLEN];
1325 s = splnet(); /* XXX */
1329 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1332 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1333 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1335 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1336 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1339 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1340 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1342 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1343 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1347 /* timeouted with IFF_{RUNNING,UP} check */
1348 if (dp->dad_ns_tcount > V_dad_maxtry) {
1349 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1350 if_name(ifa->ifa_ifp)));
1352 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1359 /* Need more checks? */
1360 if (dp->dad_ns_ocount < dp->dad_count) {
1362 * We have more NS to go. Send NS packet for DAD.
1364 nd6_dad_ns_output(dp, ifa);
1365 nd6_dad_starttimer(dp,
1366 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1369 * We have transmitted sufficient number of DAD packets.
1370 * See what we've got.
1376 if (dp->dad_na_icount) {
1378 * the check is in nd6_dad_na_input(),
1384 if (dp->dad_ns_icount) {
1385 /* We've seen NS, means DAD has failed. */
1390 /* (*dp) will be freed in nd6_dad_duplicated() */
1392 nd6_dad_duplicated(ifa);
1395 * We are done with DAD. No NA came, no NS came.
1396 * No duplicate address found.
1398 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1401 "%s: DAD complete for %s - no duplicates found\n",
1402 if_name(ifa->ifa_ifp),
1403 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1405 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1418 nd6_dad_duplicated(struct ifaddr *ifa)
1420 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1423 char ip6buf[INET6_ADDRSTRLEN];
1425 dp = nd6_dad_find(ifa);
1427 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1431 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1432 "NS in/out=%d/%d, NA in=%d\n",
1433 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1434 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1436 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1437 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1439 /* We are done with DAD, with duplicate address found. (failure) */
1440 nd6_dad_stoptimer(dp);
1443 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1444 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1445 log(LOG_ERR, "%s: manual intervention required\n",
1449 * If the address is a link-local address formed from an interface
1450 * identifier based on the hardware address which is supposed to be
1451 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1452 * operation on the interface SHOULD be disabled.
1453 * [RFC 4862, Section 5.4.5]
1455 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1456 struct in6_addr in6;
1459 * To avoid over-reaction, we only apply this logic when we are
1460 * very sure that hardware addresses are supposed to be unique.
1462 switch (ifp->if_type) {
1467 #ifdef IFT_IEEE80211
1470 case IFT_INFINIBAND:
1471 in6 = ia->ia_addr.sin6_addr;
1472 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1473 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1474 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1475 log(LOG_ERR, "%s: possible hardware address "
1476 "duplication detected, disable IPv6\n",
1483 TAILQ_REMOVE(&V_dadq, (struct dadq *)dp, dad_list);
1490 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1492 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1493 struct ifnet *ifp = ifa->ifa_ifp;
1495 dp->dad_ns_tcount++;
1496 if ((ifp->if_flags & IFF_UP) == 0) {
1499 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1503 dp->dad_ns_ocount++;
1504 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1508 nd6_dad_ns_input(struct ifaddr *ifa)
1510 struct in6_ifaddr *ia;
1512 const struct in6_addr *taddr6;
1517 panic("ifa == NULL in nd6_dad_ns_input");
1519 ia = (struct in6_ifaddr *)ifa;
1521 taddr6 = &ia->ia_addr.sin6_addr;
1523 dp = nd6_dad_find(ifa);
1525 /* Quickhack - completely ignore DAD NS packets */
1526 if (V_dad_ignore_ns) {
1527 char ip6buf[INET6_ADDRSTRLEN];
1529 "nd6_dad_ns_input: ignoring DAD NS packet for "
1530 "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6),
1531 if_name(ifa->ifa_ifp)));
1536 * if I'm yet to start DAD, someone else started using this address
1537 * first. I have a duplicate and you win.
1539 if (dp == NULL || dp->dad_ns_ocount == 0)
1542 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1545 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1546 nd6_dad_duplicated(ifa);
1549 * not sure if I got a duplicate.
1550 * increment ns count and see what happens.
1553 dp->dad_ns_icount++;
1558 nd6_dad_na_input(struct ifaddr *ifa)
1563 panic("ifa == NULL in nd6_dad_na_input");
1565 dp = nd6_dad_find(ifa);
1567 dp->dad_na_icount++;
1569 /* remove the address. */
1570 nd6_dad_duplicated(ifa);