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) {
276 * proxy NDP for single entry
278 proxydl = *SDL(&rt_gateway);
279 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
280 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
288 * We've got an NS packet, and we don't have that adddress
289 * assigned for us. We MUST silently ignore it.
294 myaddr6 = *IFA_IN6(ifa);
295 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
296 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
297 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
300 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
301 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
302 "(if %d, NS packet %d)\n",
303 ip6_sprintf(ip6bufs, &taddr6),
304 ifp->if_addrlen, lladdrlen - 2));
308 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
309 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
310 ip6_sprintf(ip6bufs, &saddr6)));
315 * We have neighbor solicitation packet, with target address equals to
316 * one of my tentative address.
318 * src addr how to process?
320 * multicast of course, invalid (rejected in ip6_input)
321 * unicast somebody is doing address resolution -> ignore
322 * unspec dup address detection
324 * The processing is defined in RFC 2462.
328 * If source address is unspecified address, it is for
329 * duplicate address detection.
331 * If not, the packet is for addess resolution;
332 * silently ignore it.
334 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
335 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
341 * If the source address is unspecified address, entries must not
342 * be created or updated.
343 * It looks that sender is performing DAD. Output NA toward
344 * all-node multicast address, to tell the sender that I'm using
346 * S bit ("solicited") must be zero.
348 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
349 struct in6_addr in6_all;
351 in6_all = in6addr_linklocal_allnodes;
352 if (in6_setscope(&in6_all, ifp, NULL) != 0)
354 nd6_na_output_fib(ifp, &in6_all, &taddr6,
355 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
356 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
361 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
362 ND_NEIGHBOR_SOLICIT, 0);
364 nd6_na_output_fib(ifp, &saddr6, &taddr6,
365 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
366 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
367 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
375 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
376 ip6_sprintf(ip6bufs, &saddr6)));
377 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
378 ip6_sprintf(ip6bufs, &daddr6)));
379 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
380 ip6_sprintf(ip6bufs, &taddr6)));
382 ICMP6STAT_INC(icp6s_badns);
389 * Output a Neighbor Solicitation Message. Caller specifies:
390 * - ICMP6 header source IP6 address
391 * - ND6 header target IP6 address
392 * - ND6 header source datalink address
395 * Based on RFC 2462 (duplicate address detection)
397 * ln - for source address determination
398 * nonce - If non-NULL, NS is used for duplicate address detection and
399 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
402 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
403 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
404 uint8_t *nonce, u_int fibnum)
409 struct nd_neighbor_solicit *nd_ns;
410 struct ip6_moptions im6o;
415 if (IN6_IS_ADDR_MULTICAST(taddr6))
418 /* estimate the size of message */
419 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
420 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
421 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
422 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
423 __func__, max_linkhdr, maxlen, MCLBYTES));
425 if (max_linkhdr + maxlen > MHLEN)
426 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
428 m = m_gethdr(M_NOWAIT, MT_DATA);
433 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
434 m->m_flags |= M_MCAST;
435 im6o.im6o_multicast_ifp = ifp;
436 im6o.im6o_multicast_hlim = 255;
437 im6o.im6o_multicast_loop = 0;
440 icmp6len = sizeof(*nd_ns);
441 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
442 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
444 /* fill neighbor solicitation packet */
445 ip6 = mtod(m, struct ip6_hdr *);
447 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
448 ip6->ip6_vfc |= IPV6_VERSION;
449 /* ip6->ip6_plen will be set later */
450 ip6->ip6_nxt = IPPROTO_ICMPV6;
453 ip6->ip6_dst = *daddr6;
455 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
456 ip6->ip6_dst.s6_addr16[1] = 0;
457 ip6->ip6_dst.s6_addr32[1] = 0;
458 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
459 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
460 ip6->ip6_dst.s6_addr8[12] = 0xff;
461 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
465 struct ifaddr *ifa = NULL;
469 * "If the source address of the packet prompting the
470 * solicitation is the same as one of the addresses assigned
471 * to the outgoing interface, that address SHOULD be placed
472 * in the IP Source Address of the outgoing solicitation.
473 * Otherwise, any one of the addresses assigned to the
474 * interface should be used."
476 * We use the source address for the prompting packet
477 * (saddr6), if saddr6 belongs to the outgoing interface.
478 * Otherwise, we perform the source address selection as usual.
482 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
484 /* ip6_src set already. */
485 ip6->ip6_src = *saddr6;
489 struct in6_addr dst6, src6;
492 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
493 error = in6_selectsrc_addr(fibnum, &dst6,
494 scopeid, ifp, &src6, NULL);
496 char ip6buf[INET6_ADDRSTRLEN];
497 nd6log((LOG_DEBUG, "%s: source can't be "
498 "determined: dst=%s, error=%d\n", __func__,
499 ip6_sprintf(ip6buf, &dst6),
507 * Source address for DAD packet must always be IPv6
508 * unspecified address. (0::0)
509 * We actually don't have to 0-clear the address (we did it
510 * above), but we do so here explicitly to make the intention
513 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
515 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
516 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
517 nd_ns->nd_ns_code = 0;
518 nd_ns->nd_ns_reserved = 0;
519 nd_ns->nd_ns_target = *taddr6;
520 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
523 * Add source link-layer address option.
525 * spec implementation
527 * DAD packet MUST NOT do not add the option
528 * there's no link layer address:
529 * impossible do not add the option
530 * there's link layer address:
531 * Multicast NS MUST add one add the option
532 * Unicast NS SHOULD add one add the option
534 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
535 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
536 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
537 /* 8 byte alignments... */
538 optlen = (optlen + 7) & ~7;
540 m->m_pkthdr.len += optlen;
543 bzero((caddr_t)nd_opt, optlen);
544 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
545 nd_opt->nd_opt_len = optlen >> 3;
546 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
549 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
550 * This behavior is documented as Enhanced Duplicate Address
551 * Detection in RFC 7527.
552 * net.inet6.ip6.dad_enhanced=0 disables this.
554 if (V_dad_enhanced != 0 && nonce != NULL) {
555 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
556 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
557 /* 8-byte alignment is required. */
558 optlen = (optlen + 7) & ~7;
560 m->m_pkthdr.len += optlen;
563 bzero((caddr_t)nd_opt, optlen);
564 nd_opt->nd_opt_type = ND_OPT_NONCE;
565 nd_opt->nd_opt_len = optlen >> 3;
566 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
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, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
584 icmp6_ifstat_inc(ifp, ifs6_out_msg);
585 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
586 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
596 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
597 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
600 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
604 * Neighbor advertisement input handling.
607 * Based on RFC 2462 (duplicate address detection)
609 * the following items are not implemented yet:
610 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
611 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
614 nd6_na_input(struct mbuf *m, int off, int icmp6len)
621 struct nd_neighbor_advert *nd_na;
622 struct in6_addr daddr6, taddr6;
623 struct sockaddr_in6 sin6;
624 union nd_opts ndopts;
625 u_char linkhdr[LLE_MAX_LINKHDR];
626 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
629 int flags, is_override, is_router, is_solicited;
630 int lladdr_off, lladdrlen, checklink;
638 /* RFC 6980: Nodes MUST silently ignore fragments */
639 if(m->m_flags & M_FRAGMENTED)
642 ifp = m->m_pkthdr.rcvif;
643 ip6 = mtod(m, struct ip6_hdr *);
644 if (ip6->ip6_hlim != 255) {
646 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
647 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
648 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
652 if (m->m_len < off + icmp6len) {
653 m = m_pullup(m, off + icmp6len);
655 IP6STAT_INC(ip6s_exthdrtoolong);
659 ip6 = mtod(m, struct ip6_hdr *);
660 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
662 flags = nd_na->nd_na_flags_reserved;
663 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
664 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
665 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
667 taddr6 = nd_na->nd_na_target;
668 if (in6_setscope(&taddr6, ifp, NULL))
669 goto bad; /* XXX: impossible */
671 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
673 "nd6_na_input: invalid target address %s\n",
674 ip6_sprintf(ip6bufs, &taddr6)));
678 daddr6 = ip6->ip6_dst;
679 if (IN6_IS_ADDR_MULTICAST(&daddr6))
682 "nd6_na_input: a solicited adv is multicasted\n"));
686 icmp6len -= sizeof(*nd_na);
687 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
688 if (nd6_options(&ndopts) < 0) {
690 "nd6_na_input: invalid ND option, ignored\n"));
691 /* nd6_options have incremented stats */
697 if (ndopts.nd_opts_tgt_lladdr) {
698 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
699 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
703 * This effectively disables the DAD check on a non-master CARP
707 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
709 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
712 * Target address matches one of my interface address.
714 * If my address is tentative, this means that there's somebody
715 * already using the same address as mine. This indicates DAD failure.
716 * This is defined in RFC 2462.
718 * Otherwise, process as defined in RFC 2461.
721 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
722 nd6_dad_na_input(ifa);
727 /* Just for safety, maybe unnecessary. */
731 "nd6_na_input: duplicate IP6 address %s\n",
732 ip6_sprintf(ip6bufs, &taddr6));
736 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
737 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
738 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
739 ifp->if_addrlen, lladdrlen - 2));
744 * If no neighbor cache entry is found, NA SHOULD silently be
747 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
753 * Do not try to override static entry.
755 if (ln->la_flags & LLE_STATIC)
758 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
760 * If the link-layer has address, and no lladdr option came,
761 * discard the packet.
763 if (ifp->if_addrlen && lladdr == NULL) {
768 * Record link-layer address, and update the state.
770 linkhdrsize = sizeof(linkhdr);
771 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
772 linkhdr, &linkhdrsize, &lladdr_off) != 0)
775 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
780 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
782 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
784 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
785 if ((ln->ln_router = is_router) != 0) {
787 * This means a router's state has changed from
788 * non-reachable to probably reachable, and might
789 * affect the status of associated prefixes..
797 * Check if the link-layer address has changed or not.
802 if (ln->la_flags & LLE_VALID) {
803 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
812 * This is VERY complex. Look at it with care.
814 * override solicit lladdr llchange action
819 * 0 0 y y (1) REACHABLE->STALE
820 * 0 1 n -- (2c) *->REACHABLE
821 * 0 1 y n (2b) L *->REACHABLE
822 * 0 1 y y (1) REACHABLE->STALE
825 * 1 0 y y (2a) L *->STALE
826 * 1 1 n -- (2a) *->REACHABLE
827 * 1 1 y n (2a) L *->REACHABLE
828 * 1 1 y y (2a) L *->REACHABLE
830 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
832 * If state is REACHABLE, make it STALE.
833 * no other updates should be done.
835 if (ln->ln_state == ND6_LLINFO_REACHABLE)
836 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
838 } else if (is_override /* (2a) */
839 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
840 || lladdr == NULL) { /* (2c) */
842 * Update link-local address, if any.
844 if (lladdr != NULL) {
845 linkhdrsize = sizeof(linkhdr);
846 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
847 linkhdr, &linkhdrsize, &lladdr_off) != 0)
849 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
850 linkhdrsize, lladdr_off) == 0) {
854 EVENTHANDLER_INVOKE(lle_event, ln,
859 * If solicited, make the state REACHABLE.
860 * If not solicited and the link-layer address was
861 * changed, make it STALE.
864 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
866 if (lladdr != NULL && llchange)
867 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
871 if (ln->ln_router && !is_router) {
873 * The peer dropped the router flag.
874 * Remove the sender from the Default Router List and
875 * update the Destination Cache entries.
877 struct ifnet *nd6_ifp;
879 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
880 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
881 (ND_IFINFO(nd6_ifp)->flags &
882 ND6_IFF_ACCEPT_RTADV) != 0)
884 * Even if the neighbor is not in the default
885 * router list, the neighbor may be used as a
886 * next hop for some destinations (e.g. redirect
887 * case). So we must call rt6_flush explicitly.
889 rt6_flush(&ip6->ip6_src, ifp);
891 ln->ln_router = is_router;
895 * rt->rt_flags &= ~RTF_REJECT;
898 if (ln->la_hold != NULL) {
899 memset(&sin6, 0, sizeof(sin6));
900 nd6_grab_holdchain(ln, &chain, &sin6);
907 nd6_flush_holdchain(ifp, chain, &sin6);
910 pfxlist_onlink_check();
919 ICMP6STAT_INC(icp6s_badna);
924 * Neighbor advertisement output handling.
928 * the following items are not implemented yet:
929 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
930 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
932 * tlladdr - 1 if include target link-layer address
933 * sdl0 - sockaddr_dl (= proxy NA) or NULL
936 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
937 const struct in6_addr *taddr6, u_long flags, int tlladdr,
938 struct sockaddr *sdl0, u_int fibnum)
943 struct nd_neighbor_advert *nd_na;
944 struct ip6_moptions im6o;
945 struct in6_addr daddr6, dst6, src6;
948 int icmp6len, maxlen, error;
951 daddr6 = *daddr6_0; /* make a local copy for modification */
953 /* estimate the size of message */
954 maxlen = sizeof(*ip6) + sizeof(*nd_na);
955 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
956 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
957 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
958 __func__, max_linkhdr, maxlen, MCLBYTES));
960 if (max_linkhdr + maxlen > MHLEN)
961 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
963 m = m_gethdr(M_NOWAIT, MT_DATA);
968 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
969 m->m_flags |= M_MCAST;
970 im6o.im6o_multicast_ifp = ifp;
971 im6o.im6o_multicast_hlim = 255;
972 im6o.im6o_multicast_loop = 0;
975 icmp6len = sizeof(*nd_na);
976 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
977 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
979 /* fill neighbor advertisement packet */
980 ip6 = mtod(m, struct ip6_hdr *);
982 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
983 ip6->ip6_vfc |= IPV6_VERSION;
984 ip6->ip6_nxt = IPPROTO_ICMPV6;
986 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
988 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
989 daddr6.s6_addr16[1] = 0;
990 daddr6.s6_addr32[1] = 0;
991 daddr6.s6_addr32[2] = 0;
992 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
993 if (in6_setscope(&daddr6, ifp, NULL))
996 flags &= ~ND_NA_FLAG_SOLICITED;
998 ip6->ip6_dst = daddr6;
1001 * Select a source whose scope is the same as that of the dest.
1003 in6_splitscope(&daddr6, &dst6, &scopeid);
1004 error = in6_selectsrc_addr(fibnum, &dst6,
1005 scopeid, ifp, &src6, NULL);
1007 char ip6buf[INET6_ADDRSTRLEN];
1008 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1009 "determined: dst=%s, error=%d\n",
1010 ip6_sprintf(ip6buf, &daddr6), error));
1013 ip6->ip6_src = src6;
1014 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1015 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1016 nd_na->nd_na_code = 0;
1017 nd_na->nd_na_target = *taddr6;
1018 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1021 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1022 * see nd6_ns_input() for details.
1023 * Basically, if NS packet is sent to unicast/anycast addr,
1024 * target lladdr option SHOULD NOT be included.
1028 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1029 * lladdr in sdl0. If we are not proxying (sending NA for
1030 * my address) use lladdr configured for the interface.
1034 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1036 mac = nd6_ifptomac(ifp);
1037 } else if (sdl0->sa_family == AF_LINK) {
1038 struct sockaddr_dl *sdl;
1039 sdl = (struct sockaddr_dl *)sdl0;
1040 if (sdl->sdl_alen == ifp->if_addrlen)
1044 if (tlladdr && mac) {
1045 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1046 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1048 /* roundup to 8 bytes alignment! */
1049 optlen = (optlen + 7) & ~7;
1051 m->m_pkthdr.len += optlen;
1054 bzero((caddr_t)nd_opt, optlen);
1055 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1056 nd_opt->nd_opt_len = optlen >> 3;
1057 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1059 flags &= ~ND_NA_FLAG_OVERRIDE;
1061 ip6->ip6_plen = htons((u_short)icmp6len);
1062 nd_na->nd_na_flags_reserved = flags;
1063 nd_na->nd_na_cksum = 0;
1064 nd_na->nd_na_cksum =
1065 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1067 if (send_sendso_input_hook != NULL) {
1068 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1069 sizeof(unsigned short), M_NOWAIT);
1072 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1073 m_tag_prepend(m, mtag);
1076 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1077 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1078 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1079 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1087 #ifndef BURN_BRIDGES
1089 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1090 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1091 struct sockaddr *sdl0)
1094 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1100 nd6_ifptomac(struct ifnet *ifp)
1102 switch (ifp->if_type) {
1106 case IFT_INFINIBAND:
1108 return IF_LLADDR(ifp);
1115 TAILQ_ENTRY(dadq) dad_list;
1116 struct ifaddr *dad_ifa;
1117 int dad_count; /* max NS to send */
1118 int dad_ns_tcount; /* # of trials to send NS */
1119 int dad_ns_ocount; /* NS sent so far */
1122 int dad_ns_lcount; /* looped back NS */
1123 int dad_loopbackprobe; /* probing state for loopback detection */
1124 struct callout dad_timer_ch;
1125 struct vnet *dad_vnet;
1127 #define ND_OPT_NONCE_LEN32 \
1128 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1129 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1130 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1133 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1134 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1135 #define V_dadq VNET(dadq)
1136 #define V_dad_rwlock VNET(dad_rwlock)
1138 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1139 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1140 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1141 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1144 nd6_dad_add(struct dadq *dp)
1148 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1149 dp->dad_ondadq = true;
1154 nd6_dad_del(struct dadq *dp)
1158 if (dp->dad_ondadq) {
1160 * Remove dp from the dadq and release the dadq's
1163 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1164 dp->dad_ondadq = false;
1171 static struct dadq *
1172 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1177 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1178 if (dp->dad_ifa != ifa)
1181 * Skip if the nonce matches the received one.
1182 * +2 in the length is required because of type and
1183 * length fields are included in a header.
1186 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1187 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1188 ND_OPT_NONCE_LEN) == 0) {
1189 dp->dad_ns_lcount++;
1192 refcount_acquire(&dp->dad_refcnt);
1201 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1207 nd6_dad_ns_output(dp);
1208 callout_reset(&dp->dad_timer_ch, ticks,
1209 (void (*)(void *))nd6_dad_timer, (void *)dp);
1213 nd6_dad_stoptimer(struct dadq *dp)
1216 callout_drain(&dp->dad_timer_ch);
1220 nd6_dad_rele(struct dadq *dp)
1223 if (refcount_release(&dp->dad_refcnt)) {
1224 ifa_free(dp->dad_ifa);
1233 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1234 TAILQ_INIT(&V_dadq);
1238 * Start Duplicate Address Detection (DAD) for specified interface address.
1241 nd6_dad_start(struct ifaddr *ifa, int delay)
1243 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1245 char ip6buf[INET6_ADDRSTRLEN];
1246 struct epoch_tracker et;
1248 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1249 ("starting DAD on non-tentative address %p", ifa));
1252 * If we don't need DAD, don't do it.
1253 * There are several cases:
1254 * - DAD is disabled globally or on the interface
1255 * - the interface address is anycast
1257 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1258 V_ip6_dad_count == 0 ||
1259 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1260 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1263 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1264 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1265 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1268 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1270 * DAD is already in progress. Let the existing entry
1277 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1279 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1281 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1282 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1285 callout_init(&dp->dad_timer_ch, 0);
1287 dp->dad_vnet = curvnet;
1289 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1290 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1293 * Send NS packet for DAD, ip6_dad_count times.
1294 * Note that we must delay the first transmission, if this is the
1295 * first packet to be sent from the interface after interface
1296 * (re)initialization.
1299 ifa_ref(dp->dad_ifa);
1300 dp->dad_count = V_ip6_dad_count;
1301 dp->dad_ns_icount = dp->dad_na_icount = 0;
1302 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1303 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1305 /* Add this to the dadq and add a reference for the dadq. */
1306 refcount_init(&dp->dad_refcnt, 1);
1308 NET_EPOCH_ENTER(et);
1309 nd6_dad_starttimer(dp, delay, 0);
1314 * terminate DAD unconditionally. used for address removals.
1317 nd6_dad_stop(struct ifaddr *ifa)
1321 dp = nd6_dad_find(ifa, NULL);
1323 /* DAD wasn't started yet */
1327 nd6_dad_stoptimer(dp);
1330 /* Release this function's reference, acquired by nd6_dad_find(). */
1335 nd6_dad_timer(struct dadq *dp)
1337 CURVNET_SET(dp->dad_vnet);
1338 struct ifaddr *ifa = dp->dad_ifa;
1339 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1340 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1341 char ip6buf[INET6_ADDRSTRLEN];
1342 struct epoch_tracker et;
1344 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1346 NET_EPOCH_ENTER(et);
1347 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1348 /* Do not need DAD for ifdisabled interface. */
1349 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1350 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1353 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1354 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1356 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1357 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1360 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1361 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1363 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1364 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1368 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1369 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1370 (((ifp->if_flags & IFF_UP) == 0) ||
1371 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1372 nd6log((LOG_INFO, "%s: could not run DAD "
1373 "because the interface was down or not running.\n",
1374 if_name(ifa->ifa_ifp)));
1378 /* Need more checks? */
1379 if (dp->dad_ns_ocount < dp->dad_count) {
1381 * We have more NS to go. Send NS packet for DAD.
1383 nd6_dad_starttimer(dp,
1384 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
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);
1394 else if (V_dad_enhanced != 0 &&
1395 dp->dad_ns_lcount > 0 &&
1396 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1398 * Sec. 4.1 in RFC 7527 requires transmission of
1399 * additional probes until the loopback condition
1400 * becomes clear when a looped back probe is detected.
1402 log(LOG_ERR, "%s: a looped back NS message is "
1403 "detected during DAD for %s. "
1404 "Another DAD probes are being sent.\n",
1405 if_name(ifa->ifa_ifp),
1406 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1407 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1409 * Send an NS immediately and increase dad_count by
1410 * V_nd6_mmaxtries - 1.
1413 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1414 nd6_dad_starttimer(dp,
1415 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1420 * We are done with DAD. No NA came, no NS came.
1421 * No duplicate address found. Check IFDISABLED flag
1422 * again in case that it is changed between the
1423 * beginning of this function and here.
1425 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1426 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1429 "%s: DAD complete for %s - no duplicates found\n",
1430 if_name(ifa->ifa_ifp),
1431 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1432 if (dp->dad_ns_lcount > 0)
1433 log(LOG_ERR, "%s: DAD completed while "
1434 "a looped back NS message is detected "
1435 "during DAD for %s.\n",
1436 if_name(ifa->ifa_ifp),
1437 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1448 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1450 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1452 char ip6buf[INET6_ADDRSTRLEN];
1454 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1455 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1456 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1457 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1460 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1461 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1464 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1465 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1466 log(LOG_ERR, "%s: manual intervention required\n",
1470 * If the address is a link-local address formed from an interface
1471 * identifier based on the hardware address which is supposed to be
1472 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1473 * operation on the interface SHOULD be disabled.
1474 * [RFC 4862, Section 5.4.5]
1476 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1477 struct in6_addr in6;
1480 * To avoid over-reaction, we only apply this logic when we are
1481 * very sure that hardware addresses are supposed to be unique.
1483 switch (ifp->if_type) {
1487 case IFT_INFINIBAND:
1488 in6 = ia->ia_addr.sin6_addr;
1489 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1490 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1491 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1492 log(LOG_ERR, "%s: possible hardware address "
1493 "duplication detected, disable IPv6\n",
1502 nd6_dad_ns_output(struct dadq *dp)
1504 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1505 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1508 dp->dad_ns_tcount++;
1509 if ((ifp->if_flags & IFF_UP) == 0) {
1512 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1516 dp->dad_ns_ocount++;
1517 if (V_dad_enhanced != 0) {
1518 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1519 dp->dad_nonce[i] = arc4random();
1521 * XXXHRS: Note that in the case that
1522 * DupAddrDetectTransmits > 1, multiple NS messages with
1523 * different nonces can be looped back in an unexpected
1524 * order. The current implementation recognizes only
1525 * the latest nonce on the sender side. Practically it
1526 * should work well in almost all cases.
1529 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1530 (uint8_t *)&dp->dad_nonce[0]);
1534 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1539 panic("ifa == NULL in nd6_dad_ns_input");
1541 /* Ignore Nonce option when Enhanced DAD is disabled. */
1542 if (V_dad_enhanced == 0)
1544 dp = nd6_dad_find(ifa, ndopt_nonce);
1548 dp->dad_ns_icount++;
1553 nd6_dad_na_input(struct ifaddr *ifa)
1558 panic("ifa == NULL in nd6_dad_na_input");
1560 dp = nd6_dad_find(ifa, NULL);
1562 dp->dad_na_icount++;