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>
54 #include <sys/refcount.h>
57 #include <net/if_types.h>
58 #include <net/if_dl.h>
59 #include <net/if_var.h>
60 #include <net/route.h>
62 #include <net/radix_mpath.h>
65 #include <netinet/in.h>
66 #include <netinet/in_var.h>
67 #include <net/if_llatbl.h>
68 #define L3_ADDR_SIN6(le) ((struct sockaddr_in6 *) L3_ADDR(le))
69 #include <netinet6/in6_var.h>
70 #include <netinet6/in6_ifattach.h>
71 #include <netinet/ip6.h>
72 #include <netinet6/ip6_var.h>
73 #include <netinet6/scope6_var.h>
74 #include <netinet6/nd6.h>
75 #include <netinet/icmp6.h>
76 #include <netinet/ip_carp.h>
77 #include <netinet6/send.h>
79 #define SDL(s) ((struct sockaddr_dl *)s)
82 static struct dadq *nd6_dad_find(struct ifaddr *);
83 static void nd6_dad_add(struct dadq *dp);
84 static void nd6_dad_del(struct dadq *dp);
85 static void nd6_dad_rele(struct dadq *);
86 static void nd6_dad_starttimer(struct dadq *, int);
87 static void nd6_dad_stoptimer(struct dadq *);
88 static void nd6_dad_timer(struct dadq *);
89 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
90 static void nd6_dad_ns_output(struct dadq *, struct ifaddr *);
91 static void nd6_dad_ns_input(struct ifaddr *);
92 static void nd6_dad_na_input(struct ifaddr *);
93 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
94 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
96 static VNET_DEFINE(int, dad_ignore_ns) = 0; /* ignore NS in DAD
97 - specwise incorrect */
98 static VNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to
99 transmit DAD packet */
100 #define V_dad_ignore_ns VNET(dad_ignore_ns)
101 #define V_dad_maxtry VNET(dad_maxtry)
104 * Input a Neighbor Solicitation Message.
107 * Based on RFC 2462 (duplicate address detection)
110 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
112 struct ifnet *ifp = m->m_pkthdr.rcvif;
113 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
114 struct nd_neighbor_solicit *nd_ns;
115 struct in6_addr saddr6 = ip6->ip6_src;
116 struct in6_addr daddr6 = ip6->ip6_dst;
117 struct in6_addr taddr6;
118 struct in6_addr myaddr6;
120 struct ifaddr *ifa = NULL;
122 int anycast = 0, proxy = 0, tentative = 0;
125 union nd_opts ndopts;
126 struct sockaddr_dl proxydl;
127 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
129 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
130 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
132 #ifndef PULLDOWN_TEST
133 IP6_EXTHDR_CHECK(m, off, icmp6len,);
134 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
136 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
138 ICMP6STAT_INC(icp6s_tooshort);
142 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
143 taddr6 = nd_ns->nd_ns_target;
144 if (in6_setscope(&taddr6, ifp, NULL) != 0)
147 if (ip6->ip6_hlim != 255) {
149 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
150 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
151 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
155 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
156 /* dst has to be a solicited node multicast address. */
157 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
158 /* don't check ifindex portion */
159 daddr6.s6_addr32[1] == 0 &&
160 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
161 daddr6.s6_addr8[12] == 0xff) {
164 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
165 "(wrong ip6 dst)\n"));
168 } else if (!V_nd6_onlink_ns_rfc4861) {
169 struct sockaddr_in6 src_sa6;
172 * According to recent IETF discussions, it is not a good idea
173 * to accept a NS from an address which would not be deemed
174 * to be a neighbor otherwise. This point is expected to be
175 * clarified in future revisions of the specification.
177 bzero(&src_sa6, sizeof(src_sa6));
178 src_sa6.sin6_family = AF_INET6;
179 src_sa6.sin6_len = sizeof(src_sa6);
180 src_sa6.sin6_addr = saddr6;
181 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
182 nd6log((LOG_INFO, "nd6_ns_input: "
183 "NS packet from non-neighbor\n"));
188 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
189 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
193 icmp6len -= sizeof(*nd_ns);
194 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
195 if (nd6_options(&ndopts) < 0) {
197 "nd6_ns_input: invalid ND option, ignored\n"));
198 /* nd6_options have incremented stats */
202 if (ndopts.nd_opts_src_lladdr) {
203 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
204 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
207 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
208 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
209 "(link-layer address option)\n"));
214 * Attaching target link-layer address to the NA?
217 * NS IP dst is unicast/anycast MUST NOT add
218 * NS IP dst is solicited-node multicast MUST add
220 * In implementation, we add target link-layer address by default.
221 * We do not add one in MUST NOT cases.
223 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
229 * Target address (taddr6) must be either:
230 * (1) Valid unicast/anycast address for my receiving interface,
231 * (2) Unicast address for which I'm offering proxy service, or
232 * (3) "tentative" address on which DAD is being performed.
234 /* (1) and (3) check. */
236 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
238 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
245 bzero(&ro, sizeof(ro));
246 ro.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
247 ro.ro_dst.sin6_family = AF_INET6;
248 ro.ro_dst.sin6_addr = taddr6;
250 /* Always use the default FIB. */
252 rtalloc_mpath_fib((struct route *)&ro, ntohl(taddr6.s6_addr32[3]),
255 in6_rtalloc(&ro, RT_DEFAULT_FIB);
257 need_proxy = (ro.ro_rt &&
258 (ro.ro_rt->rt_flags & RTF_ANNOUNCE) != 0 &&
259 ro.ro_rt->rt_gateway->sa_family == AF_LINK);
260 if (ro.ro_rt != NULL) {
262 proxydl = *SDL(ro.ro_rt->rt_gateway);
267 * proxy NDP for single entry
269 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
270 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
277 * We've got an NS packet, and we don't have that adddress
278 * assigned for us. We MUST silently ignore it.
283 myaddr6 = *IFA_IN6(ifa);
284 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
285 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
286 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
289 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
290 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
291 "(if %d, NS packet %d)\n",
292 ip6_sprintf(ip6bufs, &taddr6),
293 ifp->if_addrlen, lladdrlen - 2));
297 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
298 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
299 ip6_sprintf(ip6bufs, &saddr6)));
304 * We have neighbor solicitation packet, with target address equals to
305 * one of my tentative address.
307 * src addr how to process?
309 * multicast of course, invalid (rejected in ip6_input)
310 * unicast somebody is doing address resolution -> ignore
311 * unspec dup address detection
313 * The processing is defined in RFC 2462.
317 * If source address is unspecified address, it is for
318 * duplicate address detection.
320 * If not, the packet is for addess resolution;
321 * silently ignore it.
323 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
324 nd6_dad_ns_input(ifa);
330 * If the source address is unspecified address, entries must not
331 * be created or updated.
332 * It looks that sender is performing DAD. Output NA toward
333 * all-node multicast address, to tell the sender that I'm using
335 * S bit ("solicited") must be zero.
337 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
338 struct in6_addr in6_all;
340 in6_all = in6addr_linklocal_allnodes;
341 if (in6_setscope(&in6_all, ifp, NULL) != 0)
343 nd6_na_output_fib(ifp, &in6_all, &taddr6,
344 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
345 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
350 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
351 ND_NEIGHBOR_SOLICIT, 0);
353 nd6_na_output_fib(ifp, &saddr6, &taddr6,
354 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
355 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
356 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
364 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
365 ip6_sprintf(ip6bufs, &saddr6)));
366 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
367 ip6_sprintf(ip6bufs, &daddr6)));
368 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
369 ip6_sprintf(ip6bufs, &taddr6)));
370 ICMP6STAT_INC(icp6s_badns);
377 * Output a Neighbor Solicitation Message. Caller specifies:
378 * - ICMP6 header source IP6 address
379 * - ND6 header target IP6 address
380 * - ND6 header source datalink address
383 * Based on RFC 2462 (duplicate address detection)
385 * ln - for source address determination
386 * dad - duplicate address detection
389 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
390 const struct in6_addr *taddr6, struct llentry *ln, int dad)
395 struct nd_neighbor_solicit *nd_ns;
396 struct ip6_moptions im6o;
402 if (IN6_IS_ADDR_MULTICAST(taddr6))
405 /* estimate the size of message */
406 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
407 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
408 if (max_linkhdr + maxlen >= MCLBYTES) {
410 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
411 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
416 if (max_linkhdr + maxlen > MHLEN)
417 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
419 m = m_gethdr(M_NOWAIT, MT_DATA);
423 bzero(&ro, sizeof(ro));
425 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
426 m->m_flags |= M_MCAST;
427 im6o.im6o_multicast_ifp = ifp;
428 im6o.im6o_multicast_hlim = 255;
429 im6o.im6o_multicast_loop = 0;
432 icmp6len = sizeof(*nd_ns);
433 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
434 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
436 /* fill neighbor solicitation packet */
437 ip6 = mtod(m, struct ip6_hdr *);
439 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
440 ip6->ip6_vfc |= IPV6_VERSION;
441 /* ip6->ip6_plen will be set later */
442 ip6->ip6_nxt = IPPROTO_ICMPV6;
445 ip6->ip6_dst = *daddr6;
447 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
448 ip6->ip6_dst.s6_addr16[1] = 0;
449 ip6->ip6_dst.s6_addr32[1] = 0;
450 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
451 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
452 ip6->ip6_dst.s6_addr8[12] = 0xff;
453 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
461 * "If the source address of the packet prompting the
462 * solicitation is the same as one of the addresses assigned
463 * to the outgoing interface, that address SHOULD be placed
464 * in the IP Source Address of the outgoing solicitation.
465 * Otherwise, any one of the addresses assigned to the
466 * interface should be used."
468 * We use the source address for the prompting packet
470 * - saddr6 is given from the caller (by giving "ln"), and
471 * - saddr6 belongs to the outgoing interface.
472 * Otherwise, we perform the source address selection as usual.
474 struct in6_addr *hsrc;
479 if (ln->la_hold != NULL) {
480 struct ip6_hdr *hip6; /* hold ip6 */
483 * assuming every packet in la_hold has the same IP
486 hip6 = mtod(ln->la_hold, struct ip6_hdr *);
488 if (sizeof(*hip6) < ln->la_hold->m_len) {
489 ip6->ip6_src = hip6->ip6_src;
490 hsrc = &hip6->ip6_src;
495 if (hsrc && (ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
497 /* ip6_src set already. */
501 struct sockaddr_in6 dst_sa;
502 struct in6_addr src_in;
505 bzero(&dst_sa, sizeof(dst_sa));
506 dst_sa.sin6_family = AF_INET6;
507 dst_sa.sin6_len = sizeof(dst_sa);
508 dst_sa.sin6_addr = ip6->ip6_dst;
511 error = in6_selectsrc(&dst_sa, NULL,
512 NULL, &ro, NULL, &oifp, &src_in);
514 char ip6buf[INET6_ADDRSTRLEN];
516 "nd6_ns_output: source can't be "
517 "determined: dst=%s, error=%d\n",
518 ip6_sprintf(ip6buf, &dst_sa.sin6_addr),
522 ip6->ip6_src = src_in;
526 * Source address for DAD packet must always be IPv6
527 * unspecified address. (0::0)
528 * We actually don't have to 0-clear the address (we did it
529 * above), but we do so here explicitly to make the intention
532 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
534 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
535 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
536 nd_ns->nd_ns_code = 0;
537 nd_ns->nd_ns_reserved = 0;
538 nd_ns->nd_ns_target = *taddr6;
539 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
542 * Add source link-layer address option.
544 * spec implementation
546 * DAD packet MUST NOT do not add the option
547 * there's no link layer address:
548 * impossible do not add the option
549 * there's link layer address:
550 * Multicast NS MUST add one add the option
551 * Unicast NS SHOULD add one add the option
553 if (!dad && (mac = nd6_ifptomac(ifp))) {
554 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
555 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
556 /* 8 byte alignments... */
557 optlen = (optlen + 7) & ~7;
559 m->m_pkthdr.len += optlen;
562 bzero((caddr_t)nd_opt, optlen);
563 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
564 nd_opt->nd_opt_len = optlen >> 3;
565 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
568 ip6->ip6_plen = htons((u_short)icmp6len);
569 nd_ns->nd_ns_cksum = 0;
571 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
573 if (send_sendso_input_hook != NULL) {
574 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
575 sizeof(unsigned short), M_NOWAIT);
578 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
579 m_tag_prepend(m, mtag);
582 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL);
583 icmp6_ifstat_inc(ifp, ifs6_out_msg);
584 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
585 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
587 /* We don't cache this route. */
601 * Neighbor advertisement input handling.
604 * Based on RFC 2462 (duplicate address detection)
606 * the following items are not implemented yet:
607 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
608 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
611 nd6_na_input(struct mbuf *m, int off, int icmp6len)
613 struct ifnet *ifp = m->m_pkthdr.rcvif;
614 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
615 struct nd_neighbor_advert *nd_na;
616 struct in6_addr daddr6 = ip6->ip6_dst;
617 struct in6_addr taddr6;
626 struct llentry *ln = NULL;
627 union nd_opts ndopts;
628 struct mbuf *chain = NULL;
629 struct sockaddr_in6 sin6;
630 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
632 if (ip6->ip6_hlim != 255) {
634 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
635 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
636 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
640 #ifndef PULLDOWN_TEST
641 IP6_EXTHDR_CHECK(m, off, icmp6len,);
642 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
644 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
646 ICMP6STAT_INC(icp6s_tooshort);
651 flags = nd_na->nd_na_flags_reserved;
652 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
653 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
654 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
655 memset(&sin6, 0, sizeof(sin6));
657 taddr6 = nd_na->nd_na_target;
658 if (in6_setscope(&taddr6, ifp, NULL))
659 goto bad; /* XXX: impossible */
661 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
663 "nd6_na_input: invalid target address %s\n",
664 ip6_sprintf(ip6bufs, &taddr6)));
667 if (IN6_IS_ADDR_MULTICAST(&daddr6))
670 "nd6_na_input: a solicited adv is multicasted\n"));
674 icmp6len -= sizeof(*nd_na);
675 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
676 if (nd6_options(&ndopts) < 0) {
678 "nd6_na_input: invalid ND option, ignored\n"));
679 /* nd6_options have incremented stats */
683 if (ndopts.nd_opts_tgt_lladdr) {
684 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
685 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
689 * This effectively disables the DAD check on a non-master CARP
693 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
695 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
698 * Target address matches one of my interface address.
700 * If my address is tentative, this means that there's somebody
701 * already using the same address as mine. This indicates DAD failure.
702 * This is defined in RFC 2462.
704 * Otherwise, process as defined in RFC 2461.
707 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
709 nd6_dad_na_input(ifa);
713 /* Just for safety, maybe unnecessary. */
717 "nd6_na_input: duplicate IP6 address %s\n",
718 ip6_sprintf(ip6bufs, &taddr6));
722 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
723 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
724 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
725 ifp->if_addrlen, lladdrlen - 2));
730 * If no neighbor cache entry is found, NA SHOULD silently be
733 IF_AFDATA_RLOCK(ifp);
734 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
735 IF_AFDATA_RUNLOCK(ifp);
740 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
742 * If the link-layer has address, and no lladdr option came,
743 * discard the packet.
745 if (ifp->if_addrlen && lladdr == NULL) {
750 * Record link-layer address, and update the state.
752 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
753 ln->la_flags |= LLE_VALID;
754 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
756 ln->ln_state = ND6_LLINFO_REACHABLE;
758 if (!ND6_LLINFO_PERMANENT(ln)) {
759 nd6_llinfo_settimer_locked(ln,
760 (long)ND_IFINFO(ln->lle_tbl->llt_ifp)->reachable * hz);
763 ln->ln_state = ND6_LLINFO_STALE;
764 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
766 if ((ln->ln_router = is_router) != 0) {
768 * This means a router's state has changed from
769 * non-reachable to probably reachable, and might
770 * affect the status of associated prefixes..
778 * Check if the link-layer address has changed or not.
783 if (ln->la_flags & LLE_VALID) {
784 if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
793 * This is VERY complex. Look at it with care.
795 * override solicit lladdr llchange action
800 * 0 0 y y (1) REACHABLE->STALE
801 * 0 1 n -- (2c) *->REACHABLE
802 * 0 1 y n (2b) L *->REACHABLE
803 * 0 1 y y (1) REACHABLE->STALE
806 * 1 0 y y (2a) L *->STALE
807 * 1 1 n -- (2a) *->REACHABLE
808 * 1 1 y n (2a) L *->REACHABLE
809 * 1 1 y y (2a) L *->REACHABLE
811 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
813 * If state is REACHABLE, make it STALE.
814 * no other updates should be done.
816 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
817 ln->ln_state = ND6_LLINFO_STALE;
818 nd6_llinfo_settimer_locked(ln, (long)V_nd6_gctimer * hz);
821 } else if (is_override /* (2a) */
822 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
823 || lladdr == NULL) { /* (2c) */
825 * Update link-local address, if any.
827 if (lladdr != NULL) {
828 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
829 ln->la_flags |= LLE_VALID;
830 EVENTHANDLER_INVOKE(lle_event, ln,
835 * If solicited, make the state REACHABLE.
836 * If not solicited and the link-layer address was
837 * changed, make it STALE.
840 ln->ln_state = ND6_LLINFO_REACHABLE;
842 if (!ND6_LLINFO_PERMANENT(ln)) {
843 nd6_llinfo_settimer_locked(ln,
844 (long)ND_IFINFO(ifp)->reachable * hz);
847 if (lladdr != NULL && llchange) {
848 ln->ln_state = ND6_LLINFO_STALE;
849 nd6_llinfo_settimer_locked(ln,
850 (long)V_nd6_gctimer * hz);
855 if (ln->ln_router && !is_router) {
857 * The peer dropped the router flag.
858 * Remove the sender from the Default Router List and
859 * update the Destination Cache entries.
861 struct nd_defrouter *dr;
862 struct in6_addr *in6;
864 in6 = &L3_ADDR_SIN6(ln)->sin6_addr;
867 * Lock to protect the default router list.
868 * XXX: this might be unnecessary, since this function
869 * is only called under the network software interrupt
870 * context. However, we keep it just for safety.
872 dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
875 else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags &
876 ND6_IFF_ACCEPT_RTADV) {
878 * Even if the neighbor is not in the default
879 * router list, the neighbor may be used
880 * as a next hop for some destinations
881 * (e.g. redirect case). So we must
882 * call rt6_flush explicitly.
884 rt6_flush(&ip6->ip6_src, ifp);
887 ln->ln_router = is_router;
891 * rt->rt_flags &= ~RTF_REJECT;
894 if (ln->la_hold != NULL)
895 nd6_grab_holdchain(ln, &chain, &sin6);
901 nd6_flush_holdchain(ifp, ifp, chain, &sin6);
904 pfxlist_onlink_check();
913 ICMP6STAT_INC(icp6s_badna);
918 * Neighbor advertisement output handling.
922 * the following items are not implemented yet:
923 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
924 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
926 * tlladdr - 1 if include target link-layer address
927 * sdl0 - sockaddr_dl (= proxy NA) or NULL
930 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
931 const struct in6_addr *taddr6, u_long flags, int tlladdr,
932 struct sockaddr *sdl0, u_int fibnum)
938 struct nd_neighbor_advert *nd_na;
939 struct ip6_moptions im6o;
940 struct in6_addr src, daddr6;
941 struct sockaddr_in6 dst_sa;
942 int icmp6len, maxlen, error;
946 bzero(&ro, sizeof(ro));
948 daddr6 = *daddr6_0; /* make a local copy for modification */
950 /* estimate the size of message */
951 maxlen = sizeof(*ip6) + sizeof(*nd_na);
952 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
953 if (max_linkhdr + maxlen >= MCLBYTES) {
955 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
956 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
961 if (max_linkhdr + maxlen > MHLEN)
962 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
964 m = m_gethdr(M_NOWAIT, MT_DATA);
969 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
970 m->m_flags |= M_MCAST;
971 im6o.im6o_multicast_ifp = ifp;
972 im6o.im6o_multicast_hlim = 255;
973 im6o.im6o_multicast_loop = 0;
976 icmp6len = sizeof(*nd_na);
977 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
978 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
980 /* fill neighbor advertisement packet */
981 ip6 = mtod(m, struct ip6_hdr *);
983 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
984 ip6->ip6_vfc |= IPV6_VERSION;
985 ip6->ip6_nxt = IPPROTO_ICMPV6;
987 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
989 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
990 daddr6.s6_addr16[1] = 0;
991 daddr6.s6_addr32[1] = 0;
992 daddr6.s6_addr32[2] = 0;
993 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
994 if (in6_setscope(&daddr6, ifp, NULL))
997 flags &= ~ND_NA_FLAG_SOLICITED;
999 ip6->ip6_dst = daddr6;
1000 bzero(&dst_sa, sizeof(struct sockaddr_in6));
1001 dst_sa.sin6_family = AF_INET6;
1002 dst_sa.sin6_len = sizeof(struct sockaddr_in6);
1003 dst_sa.sin6_addr = daddr6;
1006 * Select a source whose scope is the same as that of the dest.
1008 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1010 error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src);
1012 char ip6buf[INET6_ADDRSTRLEN];
1013 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1014 "determined: dst=%s, error=%d\n",
1015 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error));
1019 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1020 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1021 nd_na->nd_na_code = 0;
1022 nd_na->nd_na_target = *taddr6;
1023 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1026 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1027 * see nd6_ns_input() for details.
1028 * Basically, if NS packet is sent to unicast/anycast addr,
1029 * target lladdr option SHOULD NOT be included.
1033 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1034 * lladdr in sdl0. If we are not proxying (sending NA for
1035 * my address) use lladdr configured for the interface.
1039 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1041 mac = nd6_ifptomac(ifp);
1042 } else if (sdl0->sa_family == AF_LINK) {
1043 struct sockaddr_dl *sdl;
1044 sdl = (struct sockaddr_dl *)sdl0;
1045 if (sdl->sdl_alen == ifp->if_addrlen)
1049 if (tlladdr && mac) {
1050 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1051 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1053 /* roundup to 8 bytes alignment! */
1054 optlen = (optlen + 7) & ~7;
1056 m->m_pkthdr.len += optlen;
1059 bzero((caddr_t)nd_opt, optlen);
1060 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1061 nd_opt->nd_opt_len = optlen >> 3;
1062 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1064 flags &= ~ND_NA_FLAG_OVERRIDE;
1066 ip6->ip6_plen = htons((u_short)icmp6len);
1067 nd_na->nd_na_flags_reserved = flags;
1068 nd_na->nd_na_cksum = 0;
1069 nd_na->nd_na_cksum =
1070 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1072 if (send_sendso_input_hook != NULL) {
1073 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1074 sizeof(unsigned short), M_NOWAIT);
1077 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1078 m_tag_prepend(m, mtag);
1081 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
1082 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1083 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1084 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1086 /* We don't cache this route. */
1099 #ifndef BURN_BRIDGES
1101 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1102 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1103 struct sockaddr *sdl0)
1106 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1112 nd6_ifptomac(struct ifnet *ifp)
1114 switch (ifp->if_type) {
1122 #ifdef IFT_IEEE80211
1125 case IFT_INFINIBAND:
1128 return IF_LLADDR(ifp);
1135 TAILQ_ENTRY(dadq) dad_list;
1136 struct ifaddr *dad_ifa;
1137 int dad_count; /* max NS to send */
1138 int dad_ns_tcount; /* # of trials to send NS */
1139 int dad_ns_ocount; /* NS sent so far */
1142 struct callout dad_timer_ch;
1143 struct vnet *dad_vnet;
1147 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1148 static VNET_DEFINE(struct rwlock, dad_rwlock);
1149 #define V_dadq VNET(dadq)
1150 #define V_dad_rwlock VNET(dad_rwlock)
1152 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1153 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1154 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1155 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1158 nd6_dad_add(struct dadq *dp)
1162 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1167 nd6_dad_del(struct dadq *dp)
1171 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1176 static struct dadq *
1177 nd6_dad_find(struct ifaddr *ifa)
1182 TAILQ_FOREACH(dp, &V_dadq, dad_list)
1183 if (dp->dad_ifa == ifa) {
1184 refcount_acquire(&dp->dad_refcnt);
1193 nd6_dad_starttimer(struct dadq *dp, int ticks)
1196 callout_reset(&dp->dad_timer_ch, ticks,
1197 (void (*)(void *))nd6_dad_timer, (void *)dp);
1201 nd6_dad_stoptimer(struct dadq *dp)
1204 callout_drain(&dp->dad_timer_ch);
1208 nd6_dad_rele(struct dadq *dp)
1211 if (refcount_release(&dp->dad_refcnt)) {
1212 ifa_free(dp->dad_ifa);
1221 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1222 TAILQ_INIT(&V_dadq);
1226 * Start Duplicate Address Detection (DAD) for specified interface address.
1229 nd6_dad_start(struct ifaddr *ifa, int delay)
1231 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1233 char ip6buf[INET6_ADDRSTRLEN];
1236 * If we don't need DAD, don't do it.
1237 * There are several cases:
1238 * - DAD is disabled (ip6_dad_count == 0)
1239 * - the interface address is anycast
1241 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1243 "nd6_dad_start: called with non-tentative address "
1245 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1246 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1249 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1250 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1253 if (!V_ip6_dad_count) {
1254 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1257 if (ifa->ifa_ifp == NULL)
1258 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1259 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) {
1262 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)
1264 if ((dp = nd6_dad_find(ifa)) != NULL) {
1265 /* DAD already in progress */
1270 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1272 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1274 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1275 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1278 callout_init(&dp->dad_timer_ch, 0);
1280 dp->dad_vnet = curvnet;
1282 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1283 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1286 * Send NS packet for DAD, ip6_dad_count times.
1287 * Note that we must delay the first transmission, if this is the
1288 * first packet to be sent from the interface after interface
1289 * (re)initialization.
1292 ifa_ref(dp->dad_ifa);
1293 dp->dad_count = V_ip6_dad_count;
1294 dp->dad_ns_icount = dp->dad_na_icount = 0;
1295 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1296 refcount_init(&dp->dad_refcnt, 1);
1299 nd6_dad_ns_output(dp, ifa);
1300 nd6_dad_starttimer(dp,
1301 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1303 nd6_dad_starttimer(dp, delay);
1308 * terminate DAD unconditionally. used for address removals.
1311 nd6_dad_stop(struct ifaddr *ifa)
1315 dp = nd6_dad_find(ifa);
1317 /* DAD wasn't started yet */
1321 nd6_dad_stoptimer(dp);
1324 * The DAD queue entry may have been removed by nd6_dad_timer() while
1325 * we were waiting for it to stop, so re-do the lookup.
1328 if (nd6_dad_find(ifa) == NULL)
1336 nd6_dad_timer(struct dadq *dp)
1338 CURVNET_SET(dp->dad_vnet);
1339 struct ifaddr *ifa = dp->dad_ifa;
1340 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1341 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1342 char ip6buf[INET6_ADDRSTRLEN];
1346 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1349 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1350 /* Do not need DAD for ifdisabled interface. */
1351 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1352 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1355 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1356 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1358 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1359 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1362 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1363 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1365 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1366 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1370 /* timeouted with IFF_{RUNNING,UP} check */
1371 if (dp->dad_ns_tcount > V_dad_maxtry) {
1372 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1373 if_name(ifa->ifa_ifp)));
1377 /* Need more checks? */
1378 if (dp->dad_ns_ocount < dp->dad_count) {
1380 * We have more NS to go. Send NS packet for DAD.
1382 nd6_dad_ns_output(dp, ifa);
1383 nd6_dad_starttimer(dp,
1384 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1388 * We have transmitted sufficient number of DAD packets.
1389 * See what we've got.
1391 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1392 /* We've seen NS or NA, means DAD has failed. */
1393 nd6_dad_duplicated(ifa, dp);
1396 * We are done with DAD. No NA came, no NS came.
1397 * No duplicate address found. Check IFDISABLED flag
1398 * again in case that it is changed between the
1399 * beginning of this function and here.
1401 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1402 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1405 "%s: DAD complete for %s - no duplicates found\n",
1406 if_name(ifa->ifa_ifp),
1407 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1417 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1419 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1421 char ip6buf[INET6_ADDRSTRLEN];
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;
1432 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1433 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1434 log(LOG_ERR, "%s: manual intervention required\n",
1438 * If the address is a link-local address formed from an interface
1439 * identifier based on the hardware address which is supposed to be
1440 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1441 * operation on the interface SHOULD be disabled.
1442 * [RFC 4862, Section 5.4.5]
1444 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1445 struct in6_addr in6;
1448 * To avoid over-reaction, we only apply this logic when we are
1449 * very sure that hardware addresses are supposed to be unique.
1451 switch (ifp->if_type) {
1456 #ifdef IFT_IEEE80211
1459 case IFT_INFINIBAND:
1460 in6 = ia->ia_addr.sin6_addr;
1461 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1462 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1463 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1464 log(LOG_ERR, "%s: possible hardware address "
1465 "duplication detected, disable IPv6\n",
1474 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa)
1476 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1477 struct ifnet *ifp = ifa->ifa_ifp;
1479 dp->dad_ns_tcount++;
1480 if ((ifp->if_flags & IFF_UP) == 0) {
1483 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1487 dp->dad_ns_ocount++;
1488 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1492 nd6_dad_ns_input(struct ifaddr *ifa)
1494 struct in6_ifaddr *ia;
1496 const struct in6_addr *taddr6;
1500 panic("ifa == NULL in nd6_dad_ns_input");
1502 ia = (struct in6_ifaddr *)ifa;
1504 taddr6 = &ia->ia_addr.sin6_addr;
1505 dp = nd6_dad_find(ifa);
1509 /* Quickhack - completely ignore DAD NS packets */
1510 if (V_dad_ignore_ns) {
1511 char ip6buf[INET6_ADDRSTRLEN];
1513 "nd6_dad_ns_input: ignoring DAD NS packet for "
1514 "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6),
1515 if_name(ifa->ifa_ifp)));
1519 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1521 dp->dad_ns_icount++;
1526 nd6_dad_na_input(struct ifaddr *ifa)
1531 panic("ifa == NULL in nd6_dad_na_input");
1533 dp = nd6_dad_find(ifa);
1535 dp->dad_na_icount++;