2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
39 #include "opt_ipsec.h"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/eventhandler.h>
44 #include <sys/malloc.h>
45 #include <sys/libkern.h>
47 #include <sys/rwlock.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
52 #include <sys/kernel.h>
53 #include <sys/errno.h>
54 #include <sys/sysctl.h>
55 #include <sys/syslog.h>
56 #include <sys/queue.h>
57 #include <sys/callout.h>
58 #include <sys/refcount.h>
61 #include <net/if_types.h>
62 #include <net/if_dl.h>
63 #include <net/if_var.h>
64 #include <net/route.h>
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <net/if_llatbl.h>
70 #include <netinet6/in6_var.h>
71 #include <netinet6/in6_ifattach.h>
72 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
74 #include <netinet6/scope6_var.h>
75 #include <netinet6/nd6.h>
76 #include <netinet/icmp6.h>
77 #include <netinet/ip_carp.h>
78 #include <netinet6/send.h>
80 #define SDL(s) ((struct sockaddr_dl *)s)
83 static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
84 static void nd6_dad_add(struct dadq *dp);
85 static void nd6_dad_del(struct dadq *dp);
86 static void nd6_dad_rele(struct dadq *);
87 static void nd6_dad_starttimer(struct dadq *, int);
88 static void nd6_dad_stoptimer(struct dadq *);
89 static void nd6_dad_timer(void *);
90 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
91 static void nd6_dad_ns_output(struct dadq *);
92 static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
93 static void nd6_dad_na_input(struct ifaddr *);
94 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
95 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
96 static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
97 const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
99 VNET_DEFINE_STATIC(int, dad_enhanced) = 1;
100 #define V_dad_enhanced VNET(dad_enhanced)
102 SYSCTL_DECL(_net_inet6_ip6);
103 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
104 &VNET_NAME(dad_enhanced), 0,
105 "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
107 VNET_DEFINE_STATIC(int, dad_maxtry) = 15; /* max # of *tries* to
108 transmit DAD packet */
109 #define V_dad_maxtry VNET(dad_maxtry)
112 * Input a Neighbor Solicitation Message.
115 * Based on RFC 2462 (duplicate address detection)
118 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
122 struct nd_neighbor_solicit *nd_ns;
123 struct in6_addr daddr6, myaddr6, saddr6, taddr6;
125 struct sockaddr_dl proxydl;
126 union nd_opts ndopts;
127 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
129 int anycast, lladdrlen, proxy, rflag, tentative, tlladdr;
133 /* RFC 6980: Nodes MUST silently ignore fragments */
134 if(m->m_flags & M_FRAGMENTED)
137 ifp = m->m_pkthdr.rcvif;
138 ip6 = mtod(m, struct ip6_hdr *);
139 if (__predict_false(ip6->ip6_hlim != 255)) {
140 ICMP6STAT_INC(icp6s_invlhlim);
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 (m->m_len < off + icmp6len) {
149 m = m_pullup(m, off + icmp6len);
151 IP6STAT_INC(ip6s_exthdrtoolong);
155 ip6 = mtod(m, struct ip6_hdr *);
156 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
158 saddr6 = ip6->ip6_src;
159 daddr6 = ip6->ip6_dst;
160 taddr6 = nd_ns->nd_ns_target;
161 if (in6_setscope(&taddr6, ifp, NULL) != 0)
164 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
165 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
168 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
169 /* dst has to be a solicited node multicast address. */
170 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
171 /* don't check ifindex portion */
172 daddr6.s6_addr32[1] == 0 &&
173 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
174 daddr6.s6_addr8[12] == 0xff) {
177 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
178 "(wrong ip6 dst)\n"));
181 } else if (!V_nd6_onlink_ns_rfc4861) {
182 struct sockaddr_in6 src_sa6;
185 * According to recent IETF discussions, it is not a good idea
186 * to accept a NS from an address which would not be deemed
187 * to be a neighbor otherwise. This point is expected to be
188 * clarified in future revisions of the specification.
190 bzero(&src_sa6, sizeof(src_sa6));
191 src_sa6.sin6_family = AF_INET6;
192 src_sa6.sin6_len = sizeof(src_sa6);
193 src_sa6.sin6_addr = saddr6;
194 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
195 nd6log((LOG_INFO, "nd6_ns_input: "
196 "NS packet from non-neighbor\n"));
201 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
202 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
206 icmp6len -= sizeof(*nd_ns);
207 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
208 if (nd6_options(&ndopts) < 0) {
210 "nd6_ns_input: invalid ND option, ignored\n"));
211 /* nd6_options have incremented stats */
217 if (ndopts.nd_opts_src_lladdr) {
218 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
219 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
222 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
223 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
224 "(link-layer address option)\n"));
229 * Attaching target link-layer address to the NA?
232 * NS IP dst is unicast/anycast MUST NOT add
233 * NS IP dst is solicited-node multicast MUST add
235 * In implementation, we add target link-layer address by default.
236 * We do not add one in MUST NOT cases.
238 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
244 * Target address (taddr6) must be either:
245 * (1) Valid unicast/anycast address for my receiving interface,
246 * (2) Unicast address for which I'm offering proxy service, or
247 * (3) "tentative" address on which DAD is being performed.
249 /* (1) and (3) check. */
251 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
253 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
258 struct sockaddr_dl rt_gateway;
259 struct rt_addrinfo info;
260 struct sockaddr_in6 dst6;
262 bzero(&dst6, sizeof(dst6));
263 dst6.sin6_len = sizeof(struct sockaddr_in6);
264 dst6.sin6_family = AF_INET6;
265 dst6.sin6_addr = taddr6;
267 bzero(&rt_gateway, sizeof(rt_gateway));
268 rt_gateway.sdl_len = sizeof(rt_gateway);
269 bzero(&info, sizeof(info));
270 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
272 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
274 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
275 rt_gateway.sdl_family == AF_LINK) {
277 * proxy NDP for single entry
279 proxydl = *SDL(&rt_gateway);
280 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
281 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
289 * We've got an NS packet, and we don't have that adddress
290 * assigned for us. We MUST silently ignore it.
295 myaddr6 = *IFA_IN6(ifa);
296 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
297 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
298 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
301 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
302 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
303 "(if %d, NS packet %d)\n",
304 ip6_sprintf(ip6bufs, &taddr6),
305 ifp->if_addrlen, lladdrlen - 2));
309 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
310 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
311 ip6_sprintf(ip6bufs, &saddr6)));
316 * We have neighbor solicitation packet, with target address equals to
317 * one of my tentative address.
319 * src addr how to process?
321 * multicast of course, invalid (rejected in ip6_input)
322 * unicast somebody is doing address resolution -> ignore
323 * unspec dup address detection
325 * The processing is defined in RFC 2462.
329 * If source address is unspecified address, it is for
330 * duplicate address detection.
332 * If not, the packet is for addess resolution;
333 * silently ignore it.
335 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
336 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
342 * If the source address is unspecified address, entries must not
343 * be created or updated.
344 * It looks that sender is performing DAD. Output NA toward
345 * all-node multicast address, to tell the sender that I'm using
347 * S bit ("solicited") must be zero.
349 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
350 struct in6_addr in6_all;
352 in6_all = in6addr_linklocal_allnodes;
353 if (in6_setscope(&in6_all, ifp, NULL) != 0)
355 nd6_na_output_fib(ifp, &in6_all, &taddr6,
356 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
357 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
362 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
363 ND_NEIGHBOR_SOLICIT, 0);
365 nd6_na_output_fib(ifp, &saddr6, &taddr6,
366 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
367 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
368 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
376 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
377 ip6_sprintf(ip6bufs, &saddr6)));
378 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
379 ip6_sprintf(ip6bufs, &daddr6)));
380 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
381 ip6_sprintf(ip6bufs, &taddr6)));
383 ICMP6STAT_INC(icp6s_badns);
390 * Output a Neighbor Solicitation Message. Caller specifies:
391 * - ICMP6 header source IP6 address
392 * - ND6 header target IP6 address
393 * - ND6 header source datalink address
396 * Based on RFC 2462 (duplicate address detection)
398 * ln - for source address determination
399 * nonce - If non-NULL, NS is used for duplicate address detection and
400 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
403 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
404 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
405 uint8_t *nonce, u_int fibnum)
410 struct nd_neighbor_solicit *nd_ns;
411 struct ip6_moptions im6o;
417 if (IN6_IS_ADDR_MULTICAST(taddr6))
420 /* estimate the size of message */
421 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
422 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
423 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
424 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
425 __func__, max_linkhdr, maxlen, MCLBYTES));
427 if (max_linkhdr + maxlen > MHLEN)
428 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
430 m = m_gethdr(M_NOWAIT, MT_DATA);
435 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
436 m->m_flags |= M_MCAST;
437 im6o.im6o_multicast_ifp = ifp;
438 im6o.im6o_multicast_hlim = 255;
439 im6o.im6o_multicast_loop = 0;
442 icmp6len = sizeof(*nd_ns);
443 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
444 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
446 /* fill neighbor solicitation packet */
447 ip6 = mtod(m, struct ip6_hdr *);
449 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
450 ip6->ip6_vfc |= IPV6_VERSION;
451 /* ip6->ip6_plen will be set later */
452 ip6->ip6_nxt = IPPROTO_ICMPV6;
455 ip6->ip6_dst = *daddr6;
457 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
458 ip6->ip6_dst.s6_addr16[1] = 0;
459 ip6->ip6_dst.s6_addr32[1] = 0;
460 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
461 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
462 ip6->ip6_dst.s6_addr8[12] = 0xff;
463 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
467 struct ifaddr *ifa = NULL;
471 * "If the source address of the packet prompting the
472 * solicitation is the same as one of the addresses assigned
473 * to the outgoing interface, that address SHOULD be placed
474 * in the IP Source Address of the outgoing solicitation.
475 * Otherwise, any one of the addresses assigned to the
476 * interface should be used."
478 * We use the source address for the prompting packet
479 * (saddr6), if saddr6 belongs to the outgoing interface.
480 * Otherwise, we perform the source address selection as usual.
484 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
486 /* ip6_src set already. */
487 ip6->ip6_src = *saddr6;
491 struct in6_addr dst6, src6;
494 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
495 error = in6_selectsrc_addr(fibnum, &dst6,
496 scopeid, ifp, &src6, NULL);
498 char ip6buf[INET6_ADDRSTRLEN];
499 nd6log((LOG_DEBUG, "%s: source can't be "
500 "determined: dst=%s, error=%d\n", __func__,
501 ip6_sprintf(ip6buf, &dst6),
509 * Source address for DAD packet must always be IPv6
510 * unspecified address. (0::0)
511 * We actually don't have to 0-clear the address (we did it
512 * above), but we do so here explicitly to make the intention
515 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
517 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
518 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
519 nd_ns->nd_ns_code = 0;
520 nd_ns->nd_ns_reserved = 0;
521 nd_ns->nd_ns_target = *taddr6;
522 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
525 * Add source link-layer address option.
527 * spec implementation
529 * DAD packet MUST NOT do not add the option
530 * there's no link layer address:
531 * impossible do not add the option
532 * there's link layer address:
533 * Multicast NS MUST add one add the option
534 * Unicast NS SHOULD add one add the option
537 struct nd_opt_hdr *nd_opt;
543 mac = (*carp_macmatch6_p)(ifp, m, &ip6->ip6_src);
545 mac = nd6_ifptomac(ifp);
548 nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
549 optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
550 /* 8 byte alignments... */
551 optlen = (optlen + 7) & ~7;
552 m->m_pkthdr.len += optlen;
555 bzero(nd_opt, optlen);
556 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
557 nd_opt->nd_opt_len = optlen >> 3;
558 bcopy(mac, nd_opt + 1, ifp->if_addrlen);
562 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
563 * This behavior is documented as Enhanced Duplicate Address
564 * Detection in RFC 7527.
565 * net.inet6.ip6.dad_enhanced=0 disables this.
567 if (V_dad_enhanced != 0 && nonce != NULL) {
568 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
569 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
570 /* 8-byte alignment is required. */
571 optlen = (optlen + 7) & ~7;
573 m->m_pkthdr.len += optlen;
576 bzero((caddr_t)nd_opt, optlen);
577 nd_opt->nd_opt_type = ND_OPT_NONCE;
578 nd_opt->nd_opt_len = optlen >> 3;
579 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
581 ip6->ip6_plen = htons((u_short)icmp6len);
582 nd_ns->nd_ns_cksum = 0;
584 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
586 if (send_sendso_input_hook != NULL) {
587 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
588 sizeof(unsigned short), M_NOWAIT);
591 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
592 m_tag_prepend(m, mtag);
595 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
597 icmp6_ifstat_inc(ifp, ifs6_out_msg);
598 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
599 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
609 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
610 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
613 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
617 * Neighbor advertisement input handling.
620 * Based on RFC 2462 (duplicate address detection)
622 * the following items are not implemented yet:
623 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
624 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
627 nd6_na_input(struct mbuf *m, int off, int icmp6len)
634 struct nd_neighbor_advert *nd_na;
635 struct in6_addr daddr6, taddr6;
636 union nd_opts ndopts;
637 u_char linkhdr[LLE_MAX_LINKHDR];
638 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
641 int flags, is_override, is_router, is_solicited;
642 int lladdr_off, lladdrlen, checklink;
643 bool flush_holdchain = false;
651 /* RFC 6980: Nodes MUST silently ignore fragments */
652 if(m->m_flags & M_FRAGMENTED)
655 ifp = m->m_pkthdr.rcvif;
656 ip6 = mtod(m, struct ip6_hdr *);
657 if (__predict_false(ip6->ip6_hlim != 255)) {
658 ICMP6STAT_INC(icp6s_invlhlim);
660 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
661 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
662 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
666 if (m->m_len < off + icmp6len) {
667 m = m_pullup(m, off + icmp6len);
669 IP6STAT_INC(ip6s_exthdrtoolong);
673 ip6 = mtod(m, struct ip6_hdr *);
674 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
676 flags = nd_na->nd_na_flags_reserved;
677 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
678 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
679 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
681 taddr6 = nd_na->nd_na_target;
682 if (in6_setscope(&taddr6, ifp, NULL))
683 goto bad; /* XXX: impossible */
685 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
687 "nd6_na_input: invalid target address %s\n",
688 ip6_sprintf(ip6bufs, &taddr6)));
692 daddr6 = ip6->ip6_dst;
693 if (IN6_IS_ADDR_MULTICAST(&daddr6))
696 "nd6_na_input: a solicited adv is multicasted\n"));
700 icmp6len -= sizeof(*nd_na);
701 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
702 if (nd6_options(&ndopts) < 0) {
704 "nd6_na_input: invalid ND option, ignored\n"));
705 /* nd6_options have incremented stats */
711 if (ndopts.nd_opts_tgt_lladdr) {
712 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
713 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
717 * This effectively disables the DAD check on a non-master CARP
721 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
723 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
726 * Target address matches one of my interface address.
728 * If my address is tentative, this means that there's somebody
729 * already using the same address as mine. This indicates DAD failure.
730 * This is defined in RFC 2462.
732 * Otherwise, process as defined in RFC 2461.
735 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
736 nd6_dad_na_input(ifa);
741 /* Just for safety, maybe unnecessary. */
745 "nd6_na_input: duplicate IP6 address %s\n",
746 ip6_sprintf(ip6bufs, &taddr6));
750 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
751 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
752 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
753 ifp->if_addrlen, lladdrlen - 2));
758 * If no neighbor cache entry is found, NA SHOULD silently be
761 ln = nd6_lookup(&taddr6, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
767 * Do not try to override static entry.
769 if (ln->la_flags & LLE_STATIC)
772 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
774 * If the link-layer has address, and no lladdr option came,
775 * discard the packet.
777 if (ifp->if_addrlen && lladdr == NULL) {
782 * Record link-layer address, and update the state.
784 if (!nd6_try_set_entry_addr(ifp, ln, lladdr))
787 flush_holdchain = true;
789 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
791 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
792 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
793 if ((ln->ln_router = is_router) != 0) {
795 * This means a router's state has changed from
796 * non-reachable to probably reachable, and might
797 * affect the status of associated prefixes..
805 * Check if the link-layer address has changed or not.
810 if (ln->la_flags & LLE_VALID) {
811 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
820 * This is VERY complex. Look at it with care.
822 * override solicit lladdr llchange action
827 * 0 0 y y (1) REACHABLE->STALE
828 * 0 1 n -- (2c) *->REACHABLE
829 * 0 1 y n (2b) L *->REACHABLE
830 * 0 1 y y (1) REACHABLE->STALE
833 * 1 0 y y (2a) L *->STALE
834 * 1 1 n -- (2a) *->REACHABLE
835 * 1 1 y n (2a) L *->REACHABLE
836 * 1 1 y y (2a) L *->REACHABLE
838 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
840 * If state is REACHABLE, make it STALE.
841 * no other updates should be done.
843 if (ln->ln_state == ND6_LLINFO_REACHABLE)
844 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
846 } else if (is_override /* (2a) */
847 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
848 || lladdr == NULL) { /* (2c) */
850 * Update link-local address, if any.
852 if (lladdr != NULL) {
853 linkhdrsize = sizeof(linkhdr);
854 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
855 linkhdr, &linkhdrsize, &lladdr_off) != 0)
857 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
858 linkhdrsize, lladdr_off) == 0)
860 EVENTHANDLER_INVOKE(lle_event, ln,
865 * If solicited, make the state REACHABLE.
866 * If not solicited and the link-layer address was
867 * changed, make it STALE.
870 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
872 if (lladdr != NULL && llchange)
873 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
877 if (ln->ln_router && !is_router) {
879 * The peer dropped the router flag.
880 * Remove the sender from the Default Router List and
881 * update the Destination Cache entries.
883 struct ifnet *nd6_ifp;
885 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
886 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
887 (ND_IFINFO(nd6_ifp)->flags &
888 ND6_IFF_ACCEPT_RTADV) != 0)
890 * Even if the neighbor is not in the default
891 * router list, the neighbor may be used as a
892 * next hop for some destinations (e.g. redirect
893 * case). So we must call rt6_flush explicitly.
895 rt6_flush(&ip6->ip6_src, ifp);
897 ln->ln_router = is_router;
901 * rt->rt_flags &= ~RTF_REJECT;
904 if (ln->la_hold != NULL)
905 chain = nd6_grab_holdchain(ln);
911 nd6_flush_holdchain(ifp, ln, chain);
913 nd6_flush_children_holdchain(ifp, ln);
916 pfxlist_onlink_check();
925 ICMP6STAT_INC(icp6s_badna);
930 * Neighbor advertisement output handling.
934 * the following items are not implemented yet:
935 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
936 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
938 * tlladdr - 1 if include target link-layer address
939 * sdl0 - sockaddr_dl (= proxy NA) or NULL
942 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
943 const struct in6_addr *taddr6, u_long flags, int tlladdr,
944 struct sockaddr *sdl0, u_int fibnum)
949 struct nd_neighbor_advert *nd_na;
950 struct ip6_moptions im6o;
951 struct in6_addr daddr6, dst6, src6;
956 int icmp6len, maxlen, error;
959 daddr6 = *daddr6_0; /* make a local copy for modification */
961 /* estimate the size of message */
962 maxlen = sizeof(*ip6) + sizeof(*nd_na);
963 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
964 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
965 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
966 __func__, max_linkhdr, maxlen, MCLBYTES));
968 if (max_linkhdr + maxlen > MHLEN)
969 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
971 m = m_gethdr(M_NOWAIT, MT_DATA);
976 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
977 m->m_flags |= M_MCAST;
978 im6o.im6o_multicast_ifp = ifp;
979 im6o.im6o_multicast_hlim = 255;
980 im6o.im6o_multicast_loop = 0;
983 icmp6len = sizeof(*nd_na);
984 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
985 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
987 /* fill neighbor advertisement packet */
988 ip6 = mtod(m, struct ip6_hdr *);
990 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
991 ip6->ip6_vfc |= IPV6_VERSION;
992 ip6->ip6_nxt = IPPROTO_ICMPV6;
994 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
996 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
997 daddr6.s6_addr16[1] = 0;
998 daddr6.s6_addr32[1] = 0;
999 daddr6.s6_addr32[2] = 0;
1000 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1001 if (in6_setscope(&daddr6, ifp, NULL))
1004 flags &= ~ND_NA_FLAG_SOLICITED;
1006 ip6->ip6_dst = daddr6;
1009 * Select a source whose scope is the same as that of the dest.
1011 in6_splitscope(&daddr6, &dst6, &scopeid);
1012 error = in6_selectsrc_addr(fibnum, &dst6,
1013 scopeid, ifp, &src6, NULL);
1015 char ip6buf[INET6_ADDRSTRLEN];
1016 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1017 "determined: dst=%s, error=%d\n",
1018 ip6_sprintf(ip6buf, &daddr6), error));
1021 ip6->ip6_src = src6;
1022 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1023 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1024 nd_na->nd_na_code = 0;
1025 nd_na->nd_na_target = *taddr6;
1026 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1029 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1030 * see nd6_ns_input() for details.
1031 * Basically, if NS packet is sent to unicast/anycast addr,
1032 * target lladdr option SHOULD NOT be included.
1036 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1037 * lladdr in sdl0. If we are not proxying (sending NA for
1038 * my address) use lladdr configured for the interface.
1042 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1044 mac = nd6_ifptomac(ifp);
1045 } else if (sdl0->sa_family == AF_LINK) {
1046 struct sockaddr_dl *sdl;
1047 sdl = (struct sockaddr_dl *)sdl0;
1048 if (sdl->sdl_alen == ifp->if_addrlen)
1052 if (tlladdr && mac) {
1053 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1054 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1056 /* roundup to 8 bytes alignment! */
1057 optlen = (optlen + 7) & ~7;
1059 m->m_pkthdr.len += optlen;
1062 bzero((caddr_t)nd_opt, optlen);
1063 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1064 nd_opt->nd_opt_len = optlen >> 3;
1065 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1067 flags &= ~ND_NA_FLAG_OVERRIDE;
1069 ip6->ip6_plen = htons((u_short)icmp6len);
1070 nd_na->nd_na_flags_reserved = flags;
1071 nd_na->nd_na_cksum = 0;
1072 nd_na->nd_na_cksum =
1073 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1075 if (send_sendso_input_hook != NULL) {
1076 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1077 sizeof(unsigned short), M_NOWAIT);
1080 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1081 m_tag_prepend(m, mtag);
1084 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1085 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1086 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1087 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1095 #ifndef BURN_BRIDGES
1097 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1098 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1099 struct sockaddr *sdl0)
1102 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1108 nd6_ifptomac(struct ifnet *ifp)
1110 switch (ifp->if_type) {
1114 case IFT_INFINIBAND:
1116 return IF_LLADDR(ifp);
1123 TAILQ_ENTRY(dadq) dad_list;
1124 struct ifaddr *dad_ifa;
1125 int dad_count; /* max NS to send */
1126 int dad_ns_tcount; /* # of trials to send NS */
1127 int dad_ns_ocount; /* NS sent so far */
1130 int dad_ns_lcount; /* looped back NS */
1131 int dad_loopbackprobe; /* probing state for loopback detection */
1132 struct callout dad_timer_ch;
1133 struct vnet *dad_vnet;
1135 #define ND_OPT_NONCE_LEN32 \
1136 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1137 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1138 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1141 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1142 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1143 #define V_dadq VNET(dadq)
1144 #define V_dad_rwlock VNET(dad_rwlock)
1146 #define DADQ_LOCKPTR() (&V_dad_rwlock)
1147 #define DADQ_LOCK_INIT() rw_init(DADQ_LOCKPTR(), "nd6 DAD queue")
1148 #define DADQ_RLOCK() rw_rlock(DADQ_LOCKPTR())
1149 #define DADQ_RUNLOCK() rw_runlock(DADQ_LOCKPTR())
1150 #define DADQ_WLOCK() rw_wlock(DADQ_LOCKPTR())
1151 #define DADQ_WUNLOCK() rw_wunlock(DADQ_LOCKPTR())
1153 #define DADQ_LOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_LOCKED);
1154 #define DADQ_RLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_RLOCKED);
1155 #define DADQ_WLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_WLOCKED);
1158 nd6_dad_add(struct dadq *dp)
1160 DADQ_WLOCK_ASSERT();
1162 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1163 dp->dad_ondadq = true;
1167 nd6_dad_del(struct dadq *dp)
1169 DADQ_WLOCK_ASSERT();
1171 if (dp->dad_ondadq) {
1173 * Remove dp from the dadq and release the dadq's
1176 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1177 dp->dad_ondadq = false;
1182 static struct dadq *
1183 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1189 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1190 if (dp->dad_ifa != ifa)
1194 * Skip if the nonce matches the received one.
1195 * +2 in the length is required because of type and
1196 * length fields are included in a header.
1199 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1200 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1201 ND_OPT_NONCE_LEN) == 0) {
1202 dp->dad_ns_lcount++;
1212 nd6_dad_starttimer(struct dadq *dp, int ticks)
1214 DADQ_WLOCK_ASSERT();
1216 callout_reset(&dp->dad_timer_ch, ticks, nd6_dad_timer, dp);
1220 nd6_dad_stoptimer(struct dadq *dp)
1222 callout_drain(&dp->dad_timer_ch);
1226 nd6_dad_rele(struct dadq *dp)
1228 if (refcount_release(&dp->dad_refcnt)) {
1229 KASSERT(!dp->dad_ondadq, ("dp %p still on DAD queue", dp));
1230 ifa_free(dp->dad_ifa);
1239 TAILQ_INIT(&V_dadq);
1243 * Start Duplicate Address Detection (DAD) for specified interface address.
1246 nd6_dad_start(struct ifaddr *ifa, int delay)
1248 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1250 char ip6buf[INET6_ADDRSTRLEN];
1252 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1253 ("starting DAD on non-tentative address %p", ifa));
1256 * If we don't need DAD, don't do it.
1257 * There are several cases:
1258 * - DAD is disabled globally or on the interface
1259 * - the interface address is anycast
1261 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1262 V_ip6_dad_count == 0 ||
1263 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1264 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1267 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1268 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1269 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1273 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1275 * DAD is already in progress. Let the existing entry
1282 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1284 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1286 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1287 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1290 callout_init_rw(&dp->dad_timer_ch, DADQ_LOCKPTR(),
1291 CALLOUT_RETURNUNLOCKED);
1293 dp->dad_vnet = curvnet;
1295 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1296 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1299 * Send NS packet for DAD, ip6_dad_count times.
1300 * Note that we must delay the first transmission, if this is the
1301 * first packet to be sent from the interface after interface
1302 * (re)initialization.
1305 ifa_ref(dp->dad_ifa);
1306 dp->dad_count = V_ip6_dad_count;
1307 dp->dad_ns_icount = dp->dad_na_icount = 0;
1308 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1309 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1311 /* Add this to the dadq and add a reference for the dadq. */
1312 refcount_init(&dp->dad_refcnt, 1);
1314 nd6_dad_starttimer(dp, delay);
1319 * terminate DAD unconditionally. used for address removals.
1322 nd6_dad_stop(struct ifaddr *ifa)
1327 dp = nd6_dad_find(ifa, NULL);
1330 /* DAD wasn't started yet */
1335 * Acquire a temporary reference so that we can safely stop the callout.
1337 (void)refcount_acquire(&dp->dad_refcnt);
1341 nd6_dad_stoptimer(dp);
1346 nd6_dad_timer(void *arg)
1348 struct dadq *dp = arg;
1349 struct ifaddr *ifa = dp->dad_ifa;
1350 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1351 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1352 char ip6buf[INET6_ADDRSTRLEN];
1353 struct epoch_tracker et;
1355 CURVNET_SET(dp->dad_vnet);
1356 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1358 NET_EPOCH_ENTER(et);
1359 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1360 /* Do not need DAD for ifdisabled interface. */
1361 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1362 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1365 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1366 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1368 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1369 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1372 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1373 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1375 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1376 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1380 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1381 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1382 (((ifp->if_flags & IFF_UP) == 0) ||
1383 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1384 nd6log((LOG_INFO, "%s: could not run DAD "
1385 "because the interface was down or not running.\n",
1386 if_name(ifa->ifa_ifp)));
1390 /* Need more checks? */
1391 if (dp->dad_ns_ocount < dp->dad_count) {
1393 * We have more NS to go. Send NS packet for DAD.
1395 nd6_dad_starttimer(dp,
1396 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1397 nd6_dad_ns_output(dp);
1401 * We have transmitted sufficient number of DAD packets.
1402 * See what we've got.
1404 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0) {
1405 /* We've seen NS or NA, means DAD has failed. */
1406 nd6_dad_duplicated(ifa, dp);
1407 } else if (V_dad_enhanced != 0 &&
1408 dp->dad_ns_lcount > 0 &&
1409 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1411 * Sec. 4.1 in RFC 7527 requires transmission of
1412 * additional probes until the loopback condition
1413 * becomes clear when a looped back probe is detected.
1415 log(LOG_ERR, "%s: a looped back NS message is "
1416 "detected during DAD for %s. "
1417 "Another DAD probes are being sent.\n",
1418 if_name(ifa->ifa_ifp),
1419 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1420 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1422 * Send an NS immediately and increase dad_count by
1423 * V_nd6_mmaxtries - 1.
1426 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1427 nd6_dad_starttimer(dp,
1428 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1429 nd6_dad_ns_output(dp);
1433 * We are done with DAD. No NA came, no NS came.
1434 * No duplicate address found. Check IFDISABLED flag
1435 * again in case that it is changed between the
1436 * beginning of this function and here.
1438 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1439 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1442 "%s: DAD complete for %s - no duplicates found\n",
1443 if_name(ifa->ifa_ifp),
1444 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1445 if (dp->dad_ns_lcount > 0)
1446 log(LOG_ERR, "%s: DAD completed while "
1447 "a looped back NS message is detected "
1448 "during DAD for %s.\n",
1449 if_name(ifa->ifa_ifp),
1450 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1462 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1464 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1466 char ip6buf[INET6_ADDRSTRLEN];
1468 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1469 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1470 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1471 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1474 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1475 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1478 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1479 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1480 log(LOG_ERR, "%s: manual intervention required\n",
1484 * If the address is a link-local address formed from an interface
1485 * identifier based on the hardware address which is supposed to be
1486 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1487 * operation on the interface SHOULD be disabled.
1488 * [RFC 4862, Section 5.4.5]
1490 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1491 struct in6_addr in6;
1494 * To avoid over-reaction, we only apply this logic when we are
1495 * very sure that hardware addresses are supposed to be unique.
1497 switch (ifp->if_type) {
1501 case IFT_INFINIBAND:
1502 in6 = ia->ia_addr.sin6_addr;
1503 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1504 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1505 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1506 log(LOG_ERR, "%s: possible hardware address "
1507 "duplication detected, disable IPv6\n",
1516 * Transmit a neighbour solicitation for the purpose of DAD. Returns with the
1517 * DAD queue unlocked.
1520 nd6_dad_ns_output(struct dadq *dp)
1522 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1523 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1526 DADQ_WLOCK_ASSERT();
1528 dp->dad_ns_tcount++;
1529 if ((ifp->if_flags & IFF_UP) == 0) {
1533 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1538 dp->dad_ns_ocount++;
1539 if (V_dad_enhanced != 0) {
1540 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1541 dp->dad_nonce[i] = arc4random();
1543 * XXXHRS: Note that in the case that
1544 * DupAddrDetectTransmits > 1, multiple NS messages with
1545 * different nonces can be looped back in an unexpected
1546 * order. The current implementation recognizes only
1547 * the latest nonce on the sender side. Practically it
1548 * should work well in almost all cases.
1552 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1553 (uint8_t *)&dp->dad_nonce[0]);
1557 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1562 panic("ifa == NULL in nd6_dad_ns_input");
1564 /* Ignore Nonce option when Enhanced DAD is disabled. */
1565 if (V_dad_enhanced == 0)
1568 dp = nd6_dad_find(ifa, ndopt_nonce);
1570 dp->dad_ns_icount++;
1575 nd6_dad_na_input(struct ifaddr *ifa)
1580 panic("ifa == NULL in nd6_dad_na_input");
1583 dp = nd6_dad_find(ifa, NULL);
1585 dp->dad_na_icount++;