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 (__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;
418 if (IN6_IS_ADDR_MULTICAST(taddr6))
421 /* estimate the size of message */
422 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
423 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
424 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
425 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
426 __func__, max_linkhdr, maxlen, MCLBYTES));
428 if (max_linkhdr + maxlen > MHLEN)
429 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
431 m = m_gethdr(M_NOWAIT, MT_DATA);
436 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
437 m->m_flags |= M_MCAST;
438 im6o.im6o_multicast_ifp = ifp;
439 im6o.im6o_multicast_hlim = 255;
440 im6o.im6o_multicast_loop = 0;
443 icmp6len = sizeof(*nd_ns);
444 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
445 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
447 /* fill neighbor solicitation packet */
448 ip6 = mtod(m, struct ip6_hdr *);
450 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
451 ip6->ip6_vfc |= IPV6_VERSION;
452 /* ip6->ip6_plen will be set later */
453 ip6->ip6_nxt = IPPROTO_ICMPV6;
456 ip6->ip6_dst = *daddr6;
458 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
459 ip6->ip6_dst.s6_addr16[1] = 0;
460 ip6->ip6_dst.s6_addr32[1] = 0;
461 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
462 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
463 ip6->ip6_dst.s6_addr8[12] = 0xff;
464 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
468 struct ifaddr *ifa = NULL;
472 * "If the source address of the packet prompting the
473 * solicitation is the same as one of the addresses assigned
474 * to the outgoing interface, that address SHOULD be placed
475 * in the IP Source Address of the outgoing solicitation.
476 * Otherwise, any one of the addresses assigned to the
477 * interface should be used."
479 * We use the source address for the prompting packet
480 * (saddr6), if saddr6 belongs to the outgoing interface.
481 * Otherwise, we perform the source address selection as usual.
485 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
487 /* ip6_src set already. */
488 ip6->ip6_src = *saddr6;
492 struct in6_addr dst6, src6;
495 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
496 error = in6_selectsrc_addr(fibnum, &dst6,
497 scopeid, ifp, &src6, NULL);
499 char ip6buf[INET6_ADDRSTRLEN];
500 nd6log((LOG_DEBUG, "%s: source can't be "
501 "determined: dst=%s, error=%d\n", __func__,
502 ip6_sprintf(ip6buf, &dst6),
510 * Source address for DAD packet must always be IPv6
511 * unspecified address. (0::0)
512 * We actually don't have to 0-clear the address (we did it
513 * above), but we do so here explicitly to make the intention
516 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
518 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
519 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
520 nd_ns->nd_ns_code = 0;
521 nd_ns->nd_ns_reserved = 0;
522 nd_ns->nd_ns_target = *taddr6;
523 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
526 * Add source link-layer address option.
528 * spec implementation
530 * DAD packet MUST NOT do not add the option
531 * there's no link layer address:
532 * impossible do not add the option
533 * there's link layer address:
534 * Multicast NS MUST add one add the option
535 * Unicast NS SHOULD add one add the option
537 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
538 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
539 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
540 /* 8 byte alignments... */
541 optlen = (optlen + 7) & ~7;
543 m->m_pkthdr.len += optlen;
546 bzero((caddr_t)nd_opt, optlen);
547 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
548 nd_opt->nd_opt_len = optlen >> 3;
549 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
552 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
553 * This behavior is documented as Enhanced Duplicate Address
554 * Detection in RFC 7527.
555 * net.inet6.ip6.dad_enhanced=0 disables this.
557 if (V_dad_enhanced != 0 && nonce != NULL) {
558 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
559 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
560 /* 8-byte alignment is required. */
561 optlen = (optlen + 7) & ~7;
563 m->m_pkthdr.len += optlen;
566 bzero((caddr_t)nd_opt, optlen);
567 nd_opt->nd_opt_type = ND_OPT_NONCE;
568 nd_opt->nd_opt_len = optlen >> 3;
569 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
571 ip6->ip6_plen = htons((u_short)icmp6len);
572 nd_ns->nd_ns_cksum = 0;
574 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
576 if (send_sendso_input_hook != NULL) {
577 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
578 sizeof(unsigned short), M_NOWAIT);
581 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
582 m_tag_prepend(m, mtag);
585 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
587 icmp6_ifstat_inc(ifp, ifs6_out_msg);
588 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
589 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
599 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
600 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
603 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
607 * Neighbor advertisement input handling.
610 * Based on RFC 2462 (duplicate address detection)
612 * the following items are not implemented yet:
613 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
614 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
617 nd6_na_input(struct mbuf *m, int off, int icmp6len)
624 struct nd_neighbor_advert *nd_na;
625 struct in6_addr daddr6, taddr6;
626 union nd_opts ndopts;
627 u_char linkhdr[LLE_MAX_LINKHDR];
628 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
631 int flags, is_override, is_router, is_solicited;
632 int lladdr_off, lladdrlen, checklink;
640 /* RFC 6980: Nodes MUST silently ignore fragments */
641 if(m->m_flags & M_FRAGMENTED)
644 ifp = m->m_pkthdr.rcvif;
645 ip6 = mtod(m, struct ip6_hdr *);
646 if (__predict_false(ip6->ip6_hlim != 255)) {
647 ICMP6STAT_INC(icp6s_invlhlim);
649 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
650 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
651 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
655 if (m->m_len < off + icmp6len) {
656 m = m_pullup(m, off + icmp6len);
658 IP6STAT_INC(ip6s_exthdrtoolong);
662 ip6 = mtod(m, struct ip6_hdr *);
663 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
665 flags = nd_na->nd_na_flags_reserved;
666 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
667 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
668 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
670 taddr6 = nd_na->nd_na_target;
671 if (in6_setscope(&taddr6, ifp, NULL))
672 goto bad; /* XXX: impossible */
674 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
676 "nd6_na_input: invalid target address %s\n",
677 ip6_sprintf(ip6bufs, &taddr6)));
681 daddr6 = ip6->ip6_dst;
682 if (IN6_IS_ADDR_MULTICAST(&daddr6))
685 "nd6_na_input: a solicited adv is multicasted\n"));
689 icmp6len -= sizeof(*nd_na);
690 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
691 if (nd6_options(&ndopts) < 0) {
693 "nd6_na_input: invalid ND option, ignored\n"));
694 /* nd6_options have incremented stats */
700 if (ndopts.nd_opts_tgt_lladdr) {
701 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
702 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
706 * This effectively disables the DAD check on a non-master CARP
710 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
712 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
715 * Target address matches one of my interface address.
717 * If my address is tentative, this means that there's somebody
718 * already using the same address as mine. This indicates DAD failure.
719 * This is defined in RFC 2462.
721 * Otherwise, process as defined in RFC 2461.
724 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
725 nd6_dad_na_input(ifa);
730 /* Just for safety, maybe unnecessary. */
734 "nd6_na_input: duplicate IP6 address %s\n",
735 ip6_sprintf(ip6bufs, &taddr6));
739 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
740 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
741 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
742 ifp->if_addrlen, lladdrlen - 2));
747 * If no neighbor cache entry is found, NA SHOULD silently be
750 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
756 * Do not try to override static entry.
758 if (ln->la_flags & LLE_STATIC)
761 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
763 * If the link-layer has address, and no lladdr option came,
764 * discard the packet.
766 if (ifp->if_addrlen && lladdr == NULL) {
771 * Record link-layer address, and update the state.
773 if (!nd6_try_set_entry_addr(ifp, ln, lladdr))
776 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
778 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
780 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
781 if ((ln->ln_router = is_router) != 0) {
783 * This means a router's state has changed from
784 * non-reachable to probably reachable, and might
785 * affect the status of associated prefixes..
793 * Check if the link-layer address has changed or not.
798 if (ln->la_flags & LLE_VALID) {
799 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
808 * This is VERY complex. Look at it with care.
810 * override solicit lladdr llchange action
815 * 0 0 y y (1) REACHABLE->STALE
816 * 0 1 n -- (2c) *->REACHABLE
817 * 0 1 y n (2b) L *->REACHABLE
818 * 0 1 y y (1) REACHABLE->STALE
821 * 1 0 y y (2a) L *->STALE
822 * 1 1 n -- (2a) *->REACHABLE
823 * 1 1 y n (2a) L *->REACHABLE
824 * 1 1 y y (2a) L *->REACHABLE
826 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
828 * If state is REACHABLE, make it STALE.
829 * no other updates should be done.
831 if (ln->ln_state == ND6_LLINFO_REACHABLE)
832 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
834 } else if (is_override /* (2a) */
835 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
836 || lladdr == NULL) { /* (2c) */
838 * Update link-local address, if any.
840 if (lladdr != NULL) {
841 linkhdrsize = sizeof(linkhdr);
842 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
843 linkhdr, &linkhdrsize, &lladdr_off) != 0)
845 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
846 linkhdrsize, lladdr_off) == 0) {
850 EVENTHANDLER_INVOKE(lle_event, ln,
855 * If solicited, make the state REACHABLE.
856 * If not solicited and the link-layer address was
857 * changed, make it STALE.
860 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
862 if (lladdr != NULL && llchange)
863 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
867 if (ln->ln_router && !is_router) {
869 * The peer dropped the router flag.
870 * Remove the sender from the Default Router List and
871 * update the Destination Cache entries.
873 struct ifnet *nd6_ifp;
875 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
876 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
877 (ND_IFINFO(nd6_ifp)->flags &
878 ND6_IFF_ACCEPT_RTADV) != 0)
880 * Even if the neighbor is not in the default
881 * router list, the neighbor may be used as a
882 * next hop for some destinations (e.g. redirect
883 * case). So we must call rt6_flush explicitly.
885 rt6_flush(&ip6->ip6_src, ifp);
887 ln->ln_router = is_router;
891 * rt->rt_flags &= ~RTF_REJECT;
894 if (ln->la_hold != NULL)
895 chain = nd6_grab_holdchain(ln);
901 nd6_flush_holdchain(ifp, ln, chain);
904 pfxlist_onlink_check();
913 ICMP6STAT_INC(icp6s_badna);
918 * Neighbor advertisement output handling.
922 * the following items are not implemented yet:
923 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
924 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
926 * tlladdr - 1 if include target link-layer address
927 * sdl0 - sockaddr_dl (= proxy NA) or NULL
930 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
931 const struct in6_addr *taddr6, u_long flags, int tlladdr,
932 struct sockaddr *sdl0, u_int fibnum)
937 struct nd_neighbor_advert *nd_na;
938 struct ip6_moptions im6o;
939 struct in6_addr daddr6, dst6, src6;
944 int icmp6len, maxlen, error;
947 daddr6 = *daddr6_0; /* make a local copy for modification */
949 /* estimate the size of message */
950 maxlen = sizeof(*ip6) + sizeof(*nd_na);
951 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
952 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
953 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
954 __func__, max_linkhdr, maxlen, MCLBYTES));
956 if (max_linkhdr + maxlen > MHLEN)
957 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
959 m = m_gethdr(M_NOWAIT, MT_DATA);
964 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
965 m->m_flags |= M_MCAST;
966 im6o.im6o_multicast_ifp = ifp;
967 im6o.im6o_multicast_hlim = 255;
968 im6o.im6o_multicast_loop = 0;
971 icmp6len = sizeof(*nd_na);
972 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
973 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
975 /* fill neighbor advertisement packet */
976 ip6 = mtod(m, struct ip6_hdr *);
978 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
979 ip6->ip6_vfc |= IPV6_VERSION;
980 ip6->ip6_nxt = IPPROTO_ICMPV6;
982 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
984 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
985 daddr6.s6_addr16[1] = 0;
986 daddr6.s6_addr32[1] = 0;
987 daddr6.s6_addr32[2] = 0;
988 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
989 if (in6_setscope(&daddr6, ifp, NULL))
992 flags &= ~ND_NA_FLAG_SOLICITED;
994 ip6->ip6_dst = daddr6;
997 * Select a source whose scope is the same as that of the dest.
999 in6_splitscope(&daddr6, &dst6, &scopeid);
1000 error = in6_selectsrc_addr(fibnum, &dst6,
1001 scopeid, ifp, &src6, NULL);
1003 char ip6buf[INET6_ADDRSTRLEN];
1004 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1005 "determined: dst=%s, error=%d\n",
1006 ip6_sprintf(ip6buf, &daddr6), error));
1009 ip6->ip6_src = src6;
1010 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1011 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1012 nd_na->nd_na_code = 0;
1013 nd_na->nd_na_target = *taddr6;
1014 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1017 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1018 * see nd6_ns_input() for details.
1019 * Basically, if NS packet is sent to unicast/anycast addr,
1020 * target lladdr option SHOULD NOT be included.
1024 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1025 * lladdr in sdl0. If we are not proxying (sending NA for
1026 * my address) use lladdr configured for the interface.
1030 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1032 mac = nd6_ifptomac(ifp);
1033 } else if (sdl0->sa_family == AF_LINK) {
1034 struct sockaddr_dl *sdl;
1035 sdl = (struct sockaddr_dl *)sdl0;
1036 if (sdl->sdl_alen == ifp->if_addrlen)
1040 if (tlladdr && mac) {
1041 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1042 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1044 /* roundup to 8 bytes alignment! */
1045 optlen = (optlen + 7) & ~7;
1047 m->m_pkthdr.len += optlen;
1050 bzero((caddr_t)nd_opt, optlen);
1051 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1052 nd_opt->nd_opt_len = optlen >> 3;
1053 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1055 flags &= ~ND_NA_FLAG_OVERRIDE;
1057 ip6->ip6_plen = htons((u_short)icmp6len);
1058 nd_na->nd_na_flags_reserved = flags;
1059 nd_na->nd_na_cksum = 0;
1060 nd_na->nd_na_cksum =
1061 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1063 if (send_sendso_input_hook != NULL) {
1064 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1065 sizeof(unsigned short), M_NOWAIT);
1068 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1069 m_tag_prepend(m, mtag);
1072 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1073 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1074 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1075 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1083 #ifndef BURN_BRIDGES
1085 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1086 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1087 struct sockaddr *sdl0)
1090 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1096 nd6_ifptomac(struct ifnet *ifp)
1098 switch (ifp->if_type) {
1102 case IFT_INFINIBAND:
1104 return IF_LLADDR(ifp);
1111 TAILQ_ENTRY(dadq) dad_list;
1112 struct ifaddr *dad_ifa;
1113 int dad_count; /* max NS to send */
1114 int dad_ns_tcount; /* # of trials to send NS */
1115 int dad_ns_ocount; /* NS sent so far */
1118 int dad_ns_lcount; /* looped back NS */
1119 int dad_loopbackprobe; /* probing state for loopback detection */
1120 struct callout dad_timer_ch;
1121 struct vnet *dad_vnet;
1123 #define ND_OPT_NONCE_LEN32 \
1124 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1125 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1126 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1129 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1130 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1131 #define V_dadq VNET(dadq)
1132 #define V_dad_rwlock VNET(dad_rwlock)
1134 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1135 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1136 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1137 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1140 nd6_dad_add(struct dadq *dp)
1144 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1145 dp->dad_ondadq = true;
1150 nd6_dad_del(struct dadq *dp)
1154 if (dp->dad_ondadq) {
1156 * Remove dp from the dadq and release the dadq's
1159 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1160 dp->dad_ondadq = false;
1167 static struct dadq *
1168 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1173 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1174 if (dp->dad_ifa != ifa)
1177 * Skip if the nonce matches the received one.
1178 * +2 in the length is required because of type and
1179 * length fields are included in a header.
1182 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1183 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1184 ND_OPT_NONCE_LEN) == 0) {
1185 dp->dad_ns_lcount++;
1188 refcount_acquire(&dp->dad_refcnt);
1197 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1203 nd6_dad_ns_output(dp);
1204 callout_reset(&dp->dad_timer_ch, ticks,
1205 (void (*)(void *))nd6_dad_timer, (void *)dp);
1209 nd6_dad_stoptimer(struct dadq *dp)
1212 callout_drain(&dp->dad_timer_ch);
1216 nd6_dad_rele(struct dadq *dp)
1219 if (refcount_release(&dp->dad_refcnt)) {
1220 ifa_free(dp->dad_ifa);
1229 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1230 TAILQ_INIT(&V_dadq);
1234 * Start Duplicate Address Detection (DAD) for specified interface address.
1237 nd6_dad_start(struct ifaddr *ifa, int delay)
1239 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1241 char ip6buf[INET6_ADDRSTRLEN];
1242 struct epoch_tracker et;
1244 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1245 ("starting DAD on non-tentative address %p", ifa));
1248 * If we don't need DAD, don't do it.
1249 * There are several cases:
1250 * - DAD is disabled globally or on the interface
1251 * - the interface address is anycast
1253 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1254 V_ip6_dad_count == 0 ||
1255 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1256 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1259 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1260 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1261 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1264 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1266 * DAD is already in progress. Let the existing entry
1273 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1275 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1277 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1278 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1281 callout_init(&dp->dad_timer_ch, 0);
1283 dp->dad_vnet = curvnet;
1285 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1286 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1289 * Send NS packet for DAD, ip6_dad_count times.
1290 * Note that we must delay the first transmission, if this is the
1291 * first packet to be sent from the interface after interface
1292 * (re)initialization.
1295 ifa_ref(dp->dad_ifa);
1296 dp->dad_count = V_ip6_dad_count;
1297 dp->dad_ns_icount = dp->dad_na_icount = 0;
1298 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1299 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1301 /* Add this to the dadq and add a reference for the dadq. */
1302 refcount_init(&dp->dad_refcnt, 1);
1304 NET_EPOCH_ENTER(et);
1305 nd6_dad_starttimer(dp, delay, 0);
1310 * terminate DAD unconditionally. used for address removals.
1313 nd6_dad_stop(struct ifaddr *ifa)
1317 dp = nd6_dad_find(ifa, NULL);
1319 /* DAD wasn't started yet */
1323 nd6_dad_stoptimer(dp);
1326 /* Release this function's reference, acquired by nd6_dad_find(). */
1331 nd6_dad_timer(struct dadq *dp)
1333 CURVNET_SET(dp->dad_vnet);
1334 struct ifaddr *ifa = dp->dad_ifa;
1335 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1336 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1337 char ip6buf[INET6_ADDRSTRLEN];
1338 struct epoch_tracker et;
1340 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1342 NET_EPOCH_ENTER(et);
1343 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1344 /* Do not need DAD for ifdisabled interface. */
1345 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1346 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1349 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1350 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1352 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1353 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1356 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1357 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1359 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1360 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1364 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1365 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1366 (((ifp->if_flags & IFF_UP) == 0) ||
1367 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1368 nd6log((LOG_INFO, "%s: could not run DAD "
1369 "because the interface was down or not running.\n",
1370 if_name(ifa->ifa_ifp)));
1374 /* Need more checks? */
1375 if (dp->dad_ns_ocount < dp->dad_count) {
1377 * We have more NS to go. Send NS packet for DAD.
1379 nd6_dad_starttimer(dp,
1380 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1384 * We have transmitted sufficient number of DAD packets.
1385 * See what we've got.
1387 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1388 /* We've seen NS or NA, means DAD has failed. */
1389 nd6_dad_duplicated(ifa, dp);
1390 else if (V_dad_enhanced != 0 &&
1391 dp->dad_ns_lcount > 0 &&
1392 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1394 * Sec. 4.1 in RFC 7527 requires transmission of
1395 * additional probes until the loopback condition
1396 * becomes clear when a looped back probe is detected.
1398 log(LOG_ERR, "%s: a looped back NS message is "
1399 "detected during DAD for %s. "
1400 "Another DAD probes are being sent.\n",
1401 if_name(ifa->ifa_ifp),
1402 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1403 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1405 * Send an NS immediately and increase dad_count by
1406 * V_nd6_mmaxtries - 1.
1409 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1410 nd6_dad_starttimer(dp,
1411 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1416 * We are done with DAD. No NA came, no NS came.
1417 * No duplicate address found. Check IFDISABLED flag
1418 * again in case that it is changed between the
1419 * beginning of this function and here.
1421 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1422 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1425 "%s: DAD complete for %s - no duplicates found\n",
1426 if_name(ifa->ifa_ifp),
1427 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1428 if (dp->dad_ns_lcount > 0)
1429 log(LOG_ERR, "%s: DAD completed while "
1430 "a looped back NS message is detected "
1431 "during DAD for %s.\n",
1432 if_name(ifa->ifa_ifp),
1433 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1444 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1446 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1448 char ip6buf[INET6_ADDRSTRLEN];
1450 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1451 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1452 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1453 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1456 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1457 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1460 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1461 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1462 log(LOG_ERR, "%s: manual intervention required\n",
1466 * If the address is a link-local address formed from an interface
1467 * identifier based on the hardware address which is supposed to be
1468 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1469 * operation on the interface SHOULD be disabled.
1470 * [RFC 4862, Section 5.4.5]
1472 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1473 struct in6_addr in6;
1476 * To avoid over-reaction, we only apply this logic when we are
1477 * very sure that hardware addresses are supposed to be unique.
1479 switch (ifp->if_type) {
1483 case IFT_INFINIBAND:
1484 in6 = ia->ia_addr.sin6_addr;
1485 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1486 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1487 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1488 log(LOG_ERR, "%s: possible hardware address "
1489 "duplication detected, disable IPv6\n",
1498 nd6_dad_ns_output(struct dadq *dp)
1500 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1501 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1504 dp->dad_ns_tcount++;
1505 if ((ifp->if_flags & IFF_UP) == 0) {
1508 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1512 dp->dad_ns_ocount++;
1513 if (V_dad_enhanced != 0) {
1514 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1515 dp->dad_nonce[i] = arc4random();
1517 * XXXHRS: Note that in the case that
1518 * DupAddrDetectTransmits > 1, multiple NS messages with
1519 * different nonces can be looped back in an unexpected
1520 * order. The current implementation recognizes only
1521 * the latest nonce on the sender side. Practically it
1522 * should work well in almost all cases.
1525 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1526 (uint8_t *)&dp->dad_nonce[0]);
1530 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1535 panic("ifa == NULL in nd6_dad_ns_input");
1537 /* Ignore Nonce option when Enhanced DAD is disabled. */
1538 if (V_dad_enhanced == 0)
1540 dp = nd6_dad_find(ifa, ndopt_nonce);
1544 dp->dad_ns_icount++;
1549 nd6_dad_na_input(struct ifaddr *ifa)
1554 panic("ifa == NULL in nd6_dad_na_input");
1556 dp = nd6_dad_find(ifa, NULL);
1558 dp->dad_na_icount++;