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, int);
88 static void nd6_dad_stoptimer(struct dadq *);
89 static void nd6_dad_timer(struct dadq *);
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 (ip6->ip6_hlim != 255) {
141 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
142 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
143 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
147 if (m->m_len < off + icmp6len) {
148 m = m_pullup(m, off + icmp6len);
150 IP6STAT_INC(ip6s_exthdrtoolong);
154 ip6 = mtod(m, struct ip6_hdr *);
155 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
157 saddr6 = ip6->ip6_src;
158 daddr6 = ip6->ip6_dst;
159 taddr6 = nd_ns->nd_ns_target;
160 if (in6_setscope(&taddr6, ifp, NULL) != 0)
163 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
164 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
167 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
168 /* dst has to be a solicited node multicast address. */
169 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
170 /* don't check ifindex portion */
171 daddr6.s6_addr32[1] == 0 &&
172 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
173 daddr6.s6_addr8[12] == 0xff) {
176 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
177 "(wrong ip6 dst)\n"));
180 } else if (!V_nd6_onlink_ns_rfc4861) {
181 struct sockaddr_in6 src_sa6;
184 * According to recent IETF discussions, it is not a good idea
185 * to accept a NS from an address which would not be deemed
186 * to be a neighbor otherwise. This point is expected to be
187 * clarified in future revisions of the specification.
189 bzero(&src_sa6, sizeof(src_sa6));
190 src_sa6.sin6_family = AF_INET6;
191 src_sa6.sin6_len = sizeof(src_sa6);
192 src_sa6.sin6_addr = saddr6;
193 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
194 nd6log((LOG_INFO, "nd6_ns_input: "
195 "NS packet from non-neighbor\n"));
200 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
201 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
205 icmp6len -= sizeof(*nd_ns);
206 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
207 if (nd6_options(&ndopts) < 0) {
209 "nd6_ns_input: invalid ND option, ignored\n"));
210 /* nd6_options have incremented stats */
216 if (ndopts.nd_opts_src_lladdr) {
217 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
218 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
221 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
222 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
223 "(link-layer address option)\n"));
228 * Attaching target link-layer address to the NA?
231 * NS IP dst is unicast/anycast MUST NOT add
232 * NS IP dst is solicited-node multicast MUST add
234 * In implementation, we add target link-layer address by default.
235 * We do not add one in MUST NOT cases.
237 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
243 * Target address (taddr6) must be either:
244 * (1) Valid unicast/anycast address for my receiving interface,
245 * (2) Unicast address for which I'm offering proxy service, or
246 * (3) "tentative" address on which DAD is being performed.
248 /* (1) and (3) check. */
250 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
252 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
257 struct sockaddr_dl rt_gateway;
258 struct rt_addrinfo info;
259 struct sockaddr_in6 dst6;
261 bzero(&dst6, sizeof(dst6));
262 dst6.sin6_len = sizeof(struct sockaddr_in6);
263 dst6.sin6_family = AF_INET6;
264 dst6.sin6_addr = taddr6;
266 bzero(&rt_gateway, sizeof(rt_gateway));
267 rt_gateway.sdl_len = sizeof(rt_gateway);
268 bzero(&info, sizeof(info));
269 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
271 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
273 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
274 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;
416 if (IN6_IS_ADDR_MULTICAST(taddr6))
419 /* estimate the size of message */
420 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
421 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
422 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
423 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
424 __func__, max_linkhdr, maxlen, MCLBYTES));
426 if (max_linkhdr + maxlen > MHLEN)
427 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
429 m = m_gethdr(M_NOWAIT, MT_DATA);
434 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
435 m->m_flags |= M_MCAST;
436 im6o.im6o_multicast_ifp = ifp;
437 im6o.im6o_multicast_hlim = 255;
438 im6o.im6o_multicast_loop = 0;
441 icmp6len = sizeof(*nd_ns);
442 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
443 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
445 /* fill neighbor solicitation packet */
446 ip6 = mtod(m, struct ip6_hdr *);
448 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
449 ip6->ip6_vfc |= IPV6_VERSION;
450 /* ip6->ip6_plen will be set later */
451 ip6->ip6_nxt = IPPROTO_ICMPV6;
454 ip6->ip6_dst = *daddr6;
456 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
457 ip6->ip6_dst.s6_addr16[1] = 0;
458 ip6->ip6_dst.s6_addr32[1] = 0;
459 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
460 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
461 ip6->ip6_dst.s6_addr8[12] = 0xff;
462 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
466 struct ifaddr *ifa = NULL;
470 * "If the source address of the packet prompting the
471 * solicitation is the same as one of the addresses assigned
472 * to the outgoing interface, that address SHOULD be placed
473 * in the IP Source Address of the outgoing solicitation.
474 * Otherwise, any one of the addresses assigned to the
475 * interface should be used."
477 * We use the source address for the prompting packet
478 * (saddr6), if saddr6 belongs to the outgoing interface.
479 * Otherwise, we perform the source address selection as usual.
483 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
485 /* ip6_src set already. */
486 ip6->ip6_src = *saddr6;
490 struct in6_addr dst6, src6;
493 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
494 error = in6_selectsrc_addr(fibnum, &dst6,
495 scopeid, ifp, &src6, NULL);
497 char ip6buf[INET6_ADDRSTRLEN];
498 nd6log((LOG_DEBUG, "%s: source can't be "
499 "determined: dst=%s, error=%d\n", __func__,
500 ip6_sprintf(ip6buf, &dst6),
508 * Source address for DAD packet must always be IPv6
509 * unspecified address. (0::0)
510 * We actually don't have to 0-clear the address (we did it
511 * above), but we do so here explicitly to make the intention
514 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
516 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
517 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
518 nd_ns->nd_ns_code = 0;
519 nd_ns->nd_ns_reserved = 0;
520 nd_ns->nd_ns_target = *taddr6;
521 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
524 * Add source link-layer address option.
526 * spec implementation
528 * DAD packet MUST NOT do not add the option
529 * there's no link layer address:
530 * impossible do not add the option
531 * there's link layer address:
532 * Multicast NS MUST add one add the option
533 * Unicast NS SHOULD add one add the option
535 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
536 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
537 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
538 /* 8 byte alignments... */
539 optlen = (optlen + 7) & ~7;
541 m->m_pkthdr.len += optlen;
544 bzero((caddr_t)nd_opt, optlen);
545 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
546 nd_opt->nd_opt_len = optlen >> 3;
547 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
550 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
551 * This behavior is documented as Enhanced Duplicate Address
552 * Detection in RFC 7527.
553 * net.inet6.ip6.dad_enhanced=0 disables this.
555 if (V_dad_enhanced != 0 && nonce != NULL) {
556 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
557 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
558 /* 8-byte alignment is required. */
559 optlen = (optlen + 7) & ~7;
561 m->m_pkthdr.len += optlen;
564 bzero((caddr_t)nd_opt, optlen);
565 nd_opt->nd_opt_type = ND_OPT_NONCE;
566 nd_opt->nd_opt_len = optlen >> 3;
567 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
569 ip6->ip6_plen = htons((u_short)icmp6len);
570 nd_ns->nd_ns_cksum = 0;
572 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
574 if (send_sendso_input_hook != NULL) {
575 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
576 sizeof(unsigned short), M_NOWAIT);
579 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
580 m_tag_prepend(m, mtag);
583 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
585 icmp6_ifstat_inc(ifp, ifs6_out_msg);
586 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
587 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
597 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
598 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
601 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
605 * Neighbor advertisement input handling.
608 * Based on RFC 2462 (duplicate address detection)
610 * the following items are not implemented yet:
611 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
612 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
615 nd6_na_input(struct mbuf *m, int off, int icmp6len)
622 struct nd_neighbor_advert *nd_na;
623 struct in6_addr daddr6, taddr6;
624 struct sockaddr_in6 sin6;
625 union nd_opts ndopts;
626 u_char linkhdr[LLE_MAX_LINKHDR];
627 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
630 int flags, is_override, is_router, is_solicited;
631 int lladdr_off, lladdrlen, checklink;
639 /* RFC 6980: Nodes MUST silently ignore fragments */
640 if(m->m_flags & M_FRAGMENTED)
643 ifp = m->m_pkthdr.rcvif;
644 ip6 = mtod(m, struct ip6_hdr *);
645 if (ip6->ip6_hlim != 255) {
647 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
648 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
649 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
653 if (m->m_len < off + icmp6len) {
654 m = m_pullup(m, off + icmp6len);
656 IP6STAT_INC(ip6s_exthdrtoolong);
660 ip6 = mtod(m, struct ip6_hdr *);
661 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
663 flags = nd_na->nd_na_flags_reserved;
664 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
665 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
666 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
668 taddr6 = nd_na->nd_na_target;
669 if (in6_setscope(&taddr6, ifp, NULL))
670 goto bad; /* XXX: impossible */
672 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
674 "nd6_na_input: invalid target address %s\n",
675 ip6_sprintf(ip6bufs, &taddr6)));
679 daddr6 = ip6->ip6_dst;
680 if (IN6_IS_ADDR_MULTICAST(&daddr6))
683 "nd6_na_input: a solicited adv is multicasted\n"));
687 icmp6len -= sizeof(*nd_na);
688 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
689 if (nd6_options(&ndopts) < 0) {
691 "nd6_na_input: invalid ND option, ignored\n"));
692 /* nd6_options have incremented stats */
698 if (ndopts.nd_opts_tgt_lladdr) {
699 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
700 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
704 * This effectively disables the DAD check on a non-master CARP
708 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
710 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
713 * Target address matches one of my interface address.
715 * If my address is tentative, this means that there's somebody
716 * already using the same address as mine. This indicates DAD failure.
717 * This is defined in RFC 2462.
719 * Otherwise, process as defined in RFC 2461.
722 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
723 nd6_dad_na_input(ifa);
728 /* Just for safety, maybe unnecessary. */
732 "nd6_na_input: duplicate IP6 address %s\n",
733 ip6_sprintf(ip6bufs, &taddr6));
737 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
738 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
739 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
740 ifp->if_addrlen, lladdrlen - 2));
745 * If no neighbor cache entry is found, NA SHOULD silently be
748 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
754 * Do not try to override static entry.
756 if (ln->la_flags & LLE_STATIC)
759 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
761 * If the link-layer has address, and no lladdr option came,
762 * discard the packet.
764 if (ifp->if_addrlen && lladdr == NULL) {
769 * Record link-layer address, and update the state.
771 linkhdrsize = sizeof(linkhdr);
772 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
773 linkhdr, &linkhdrsize, &lladdr_off) != 0)
776 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
781 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
783 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
785 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
786 if ((ln->ln_router = is_router) != 0) {
788 * This means a router's state has changed from
789 * non-reachable to probably reachable, and might
790 * affect the status of associated prefixes..
798 * Check if the link-layer address has changed or not.
803 if (ln->la_flags & LLE_VALID) {
804 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
813 * This is VERY complex. Look at it with care.
815 * override solicit lladdr llchange action
820 * 0 0 y y (1) REACHABLE->STALE
821 * 0 1 n -- (2c) *->REACHABLE
822 * 0 1 y n (2b) L *->REACHABLE
823 * 0 1 y y (1) REACHABLE->STALE
826 * 1 0 y y (2a) L *->STALE
827 * 1 1 n -- (2a) *->REACHABLE
828 * 1 1 y n (2a) L *->REACHABLE
829 * 1 1 y y (2a) L *->REACHABLE
831 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
833 * If state is REACHABLE, make it STALE.
834 * no other updates should be done.
836 if (ln->ln_state == ND6_LLINFO_REACHABLE)
837 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
839 } else if (is_override /* (2a) */
840 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
841 || lladdr == NULL) { /* (2c) */
843 * Update link-local address, if any.
845 if (lladdr != NULL) {
846 linkhdrsize = sizeof(linkhdr);
847 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
848 linkhdr, &linkhdrsize, &lladdr_off) != 0)
850 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
851 linkhdrsize, lladdr_off) == 0) {
855 EVENTHANDLER_INVOKE(lle_event, ln,
860 * If solicited, make the state REACHABLE.
861 * If not solicited and the link-layer address was
862 * changed, make it STALE.
865 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
867 if (lladdr != NULL && llchange)
868 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
872 if (ln->ln_router && !is_router) {
874 * The peer dropped the router flag.
875 * Remove the sender from the Default Router List and
876 * update the Destination Cache entries.
878 struct ifnet *nd6_ifp;
880 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
881 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
882 (ND_IFINFO(nd6_ifp)->flags &
883 ND6_IFF_ACCEPT_RTADV) != 0)
885 * Even if the neighbor is not in the default
886 * router list, the neighbor may be used as a
887 * next hop for some destinations (e.g. redirect
888 * case). So we must call rt6_flush explicitly.
890 rt6_flush(&ip6->ip6_src, ifp);
892 ln->ln_router = is_router;
896 * rt->rt_flags &= ~RTF_REJECT;
899 if (ln->la_hold != NULL) {
900 memset(&sin6, 0, sizeof(sin6));
901 nd6_grab_holdchain(ln, &chain, &sin6);
908 nd6_flush_holdchain(ifp, chain, &sin6);
911 pfxlist_onlink_check();
920 ICMP6STAT_INC(icp6s_badna);
925 * Neighbor advertisement output handling.
929 * the following items are not implemented yet:
930 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
931 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
933 * tlladdr - 1 if include target link-layer address
934 * sdl0 - sockaddr_dl (= proxy NA) or NULL
937 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
938 const struct in6_addr *taddr6, u_long flags, int tlladdr,
939 struct sockaddr *sdl0, u_int fibnum)
944 struct nd_neighbor_advert *nd_na;
945 struct ip6_moptions im6o;
946 struct in6_addr daddr6, dst6, src6;
949 int icmp6len, maxlen, error;
952 daddr6 = *daddr6_0; /* make a local copy for modification */
954 /* estimate the size of message */
955 maxlen = sizeof(*ip6) + sizeof(*nd_na);
956 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
957 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
958 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
959 __func__, 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;
1002 * Select a source whose scope is the same as that of the dest.
1004 in6_splitscope(&daddr6, &dst6, &scopeid);
1005 error = in6_selectsrc_addr(fibnum, &dst6,
1006 scopeid, ifp, &src6, NULL);
1008 char ip6buf[INET6_ADDRSTRLEN];
1009 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1010 "determined: dst=%s, error=%d\n",
1011 ip6_sprintf(ip6buf, &daddr6), error));
1014 ip6->ip6_src = src6;
1015 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1016 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1017 nd_na->nd_na_code = 0;
1018 nd_na->nd_na_target = *taddr6;
1019 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1022 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1023 * see nd6_ns_input() for details.
1024 * Basically, if NS packet is sent to unicast/anycast addr,
1025 * target lladdr option SHOULD NOT be included.
1029 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1030 * lladdr in sdl0. If we are not proxying (sending NA for
1031 * my address) use lladdr configured for the interface.
1035 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1037 mac = nd6_ifptomac(ifp);
1038 } else if (sdl0->sa_family == AF_LINK) {
1039 struct sockaddr_dl *sdl;
1040 sdl = (struct sockaddr_dl *)sdl0;
1041 if (sdl->sdl_alen == ifp->if_addrlen)
1045 if (tlladdr && mac) {
1046 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1047 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1049 /* roundup to 8 bytes alignment! */
1050 optlen = (optlen + 7) & ~7;
1052 m->m_pkthdr.len += optlen;
1055 bzero((caddr_t)nd_opt, optlen);
1056 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1057 nd_opt->nd_opt_len = optlen >> 3;
1058 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1060 flags &= ~ND_NA_FLAG_OVERRIDE;
1062 ip6->ip6_plen = htons((u_short)icmp6len);
1063 nd_na->nd_na_flags_reserved = flags;
1064 nd_na->nd_na_cksum = 0;
1065 nd_na->nd_na_cksum =
1066 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1068 if (send_sendso_input_hook != NULL) {
1069 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1070 sizeof(unsigned short), M_NOWAIT);
1073 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1074 m_tag_prepend(m, mtag);
1077 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1078 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1079 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1080 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1088 #ifndef BURN_BRIDGES
1090 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1091 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1092 struct sockaddr *sdl0)
1095 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1101 nd6_ifptomac(struct ifnet *ifp)
1103 switch (ifp->if_type) {
1107 case IFT_INFINIBAND:
1109 return IF_LLADDR(ifp);
1116 TAILQ_ENTRY(dadq) dad_list;
1117 struct ifaddr *dad_ifa;
1118 int dad_count; /* max NS to send */
1119 int dad_ns_tcount; /* # of trials to send NS */
1120 int dad_ns_ocount; /* NS sent so far */
1123 int dad_ns_lcount; /* looped back NS */
1124 int dad_loopbackprobe; /* probing state for loopback detection */
1125 struct callout dad_timer_ch;
1126 struct vnet *dad_vnet;
1128 #define ND_OPT_NONCE_LEN32 \
1129 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1130 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1131 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1134 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1135 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1136 #define V_dadq VNET(dadq)
1137 #define V_dad_rwlock VNET(dad_rwlock)
1139 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1140 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1141 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1142 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1145 nd6_dad_add(struct dadq *dp)
1149 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1150 dp->dad_ondadq = true;
1155 nd6_dad_del(struct dadq *dp)
1159 if (dp->dad_ondadq) {
1161 * Remove dp from the dadq and release the dadq's
1164 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1165 dp->dad_ondadq = false;
1172 static struct dadq *
1173 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1178 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1179 if (dp->dad_ifa != ifa)
1182 * Skip if the nonce matches the received one.
1183 * +2 in the length is required because of type and
1184 * length fields are included in a header.
1187 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1188 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1189 ND_OPT_NONCE_LEN) == 0) {
1190 dp->dad_ns_lcount++;
1193 refcount_acquire(&dp->dad_refcnt);
1202 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1208 nd6_dad_ns_output(dp);
1209 callout_reset(&dp->dad_timer_ch, ticks,
1210 (void (*)(void *))nd6_dad_timer, (void *)dp);
1214 nd6_dad_stoptimer(struct dadq *dp)
1217 callout_drain(&dp->dad_timer_ch);
1221 nd6_dad_rele(struct dadq *dp)
1224 if (refcount_release(&dp->dad_refcnt)) {
1225 ifa_free(dp->dad_ifa);
1234 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1235 TAILQ_INIT(&V_dadq);
1239 * Start Duplicate Address Detection (DAD) for specified interface address.
1242 nd6_dad_start(struct ifaddr *ifa, int delay)
1244 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1246 char ip6buf[INET6_ADDRSTRLEN];
1247 struct epoch_tracker et;
1249 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1250 ("starting DAD on non-tentative address %p", ifa));
1253 * If we don't need DAD, don't do it.
1254 * There are several cases:
1255 * - DAD is disabled globally or on the interface
1256 * - the interface address is anycast
1258 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1259 V_ip6_dad_count == 0 ||
1260 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1261 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1264 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1265 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1266 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1269 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1271 * DAD is already in progress. Let the existing entry
1278 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1280 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1282 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1283 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1286 callout_init(&dp->dad_timer_ch, 0);
1288 dp->dad_vnet = curvnet;
1290 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1291 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1294 * Send NS packet for DAD, ip6_dad_count times.
1295 * Note that we must delay the first transmission, if this is the
1296 * first packet to be sent from the interface after interface
1297 * (re)initialization.
1300 ifa_ref(dp->dad_ifa);
1301 dp->dad_count = V_ip6_dad_count;
1302 dp->dad_ns_icount = dp->dad_na_icount = 0;
1303 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1304 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1306 /* Add this to the dadq and add a reference for the dadq. */
1307 refcount_init(&dp->dad_refcnt, 1);
1309 NET_EPOCH_ENTER(et);
1310 nd6_dad_starttimer(dp, delay, 0);
1315 * terminate DAD unconditionally. used for address removals.
1318 nd6_dad_stop(struct ifaddr *ifa)
1322 dp = nd6_dad_find(ifa, NULL);
1324 /* DAD wasn't started yet */
1328 nd6_dad_stoptimer(dp);
1331 /* Release this function's reference, acquired by nd6_dad_find(). */
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];
1343 struct epoch_tracker et;
1345 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1347 NET_EPOCH_ENTER(et);
1348 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1349 /* Do not need DAD for ifdisabled interface. */
1350 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1351 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1354 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1355 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1357 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1358 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1361 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1362 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1364 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1365 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1369 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1370 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1371 (((ifp->if_flags & IFF_UP) == 0) ||
1372 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1373 nd6log((LOG_INFO, "%s: could not run DAD "
1374 "because the interface was down or not running.\n",
1375 if_name(ifa->ifa_ifp)));
1379 /* Need more checks? */
1380 if (dp->dad_ns_ocount < dp->dad_count) {
1382 * We have more NS to go. Send NS packet for DAD.
1384 nd6_dad_starttimer(dp,
1385 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1389 * We have transmitted sufficient number of DAD packets.
1390 * See what we've got.
1392 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1393 /* We've seen NS or NA, means DAD has failed. */
1394 nd6_dad_duplicated(ifa, dp);
1395 else if (V_dad_enhanced != 0 &&
1396 dp->dad_ns_lcount > 0 &&
1397 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1399 * Sec. 4.1 in RFC 7527 requires transmission of
1400 * additional probes until the loopback condition
1401 * becomes clear when a looped back probe is detected.
1403 log(LOG_ERR, "%s: a looped back NS message is "
1404 "detected during DAD for %s. "
1405 "Another DAD probes are being sent.\n",
1406 if_name(ifa->ifa_ifp),
1407 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1408 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1410 * Send an NS immediately and increase dad_count by
1411 * V_nd6_mmaxtries - 1.
1414 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1415 nd6_dad_starttimer(dp,
1416 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1421 * We are done with DAD. No NA came, no NS came.
1422 * No duplicate address found. Check IFDISABLED flag
1423 * again in case that it is changed between the
1424 * beginning of this function and here.
1426 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1427 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1430 "%s: DAD complete for %s - no duplicates found\n",
1431 if_name(ifa->ifa_ifp),
1432 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1433 if (dp->dad_ns_lcount > 0)
1434 log(LOG_ERR, "%s: DAD completed while "
1435 "a looped back NS message is detected "
1436 "during DAD for %s.\n",
1437 if_name(ifa->ifa_ifp),
1438 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1449 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1451 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1453 char ip6buf[INET6_ADDRSTRLEN];
1455 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1456 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1457 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1458 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1461 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1462 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1465 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1466 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1467 log(LOG_ERR, "%s: manual intervention required\n",
1471 * If the address is a link-local address formed from an interface
1472 * identifier based on the hardware address which is supposed to be
1473 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1474 * operation on the interface SHOULD be disabled.
1475 * [RFC 4862, Section 5.4.5]
1477 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1478 struct in6_addr in6;
1481 * To avoid over-reaction, we only apply this logic when we are
1482 * very sure that hardware addresses are supposed to be unique.
1484 switch (ifp->if_type) {
1488 case IFT_INFINIBAND:
1489 in6 = ia->ia_addr.sin6_addr;
1490 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1491 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1492 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1493 log(LOG_ERR, "%s: possible hardware address "
1494 "duplication detected, disable IPv6\n",
1503 nd6_dad_ns_output(struct dadq *dp)
1505 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1506 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1509 dp->dad_ns_tcount++;
1510 if ((ifp->if_flags & IFF_UP) == 0) {
1513 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1517 dp->dad_ns_ocount++;
1518 if (V_dad_enhanced != 0) {
1519 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1520 dp->dad_nonce[i] = arc4random();
1522 * XXXHRS: Note that in the case that
1523 * DupAddrDetectTransmits > 1, multiple NS messages with
1524 * different nonces can be looped back in an unexpected
1525 * order. The current implementation recognizes only
1526 * the latest nonce on the sender side. Practically it
1527 * should work well in almost all cases.
1530 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1531 (uint8_t *)&dp->dad_nonce[0]);
1535 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1540 panic("ifa == NULL in nd6_dad_ns_input");
1542 /* Ignore Nonce option when Enhanced DAD is disabled. */
1543 if (V_dad_enhanced == 0)
1545 dp = nd6_dad_find(ifa, ndopt_nonce);
1549 dp->dad_ns_icount++;
1554 nd6_dad_na_input(struct ifaddr *ifa)
1559 panic("ifa == NULL in nd6_dad_na_input");
1561 dp = nd6_dad_find(ifa, NULL);
1563 dp->dad_na_icount++;