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"
40 #include "opt_mpath.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/eventhandler.h>
45 #include <sys/malloc.h>
46 #include <sys/libkern.h>
48 #include <sys/rwlock.h>
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
53 #include <sys/kernel.h>
54 #include <sys/errno.h>
55 #include <sys/sysctl.h>
56 #include <sys/syslog.h>
57 #include <sys/queue.h>
58 #include <sys/callout.h>
59 #include <sys/refcount.h>
62 #include <net/if_types.h>
63 #include <net/if_dl.h>
64 #include <net/if_var.h>
65 #include <net/route.h>
67 #include <net/radix_mpath.h>
71 #include <netinet/in.h>
72 #include <netinet/in_var.h>
73 #include <net/if_llatbl.h>
74 #include <netinet6/in6_var.h>
75 #include <netinet6/in6_ifattach.h>
76 #include <netinet/ip6.h>
77 #include <netinet6/ip6_var.h>
78 #include <netinet6/scope6_var.h>
79 #include <netinet6/nd6.h>
80 #include <netinet/icmp6.h>
81 #include <netinet/ip_carp.h>
82 #include <netinet6/send.h>
84 #define SDL(s) ((struct sockaddr_dl *)s)
87 static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
88 static void nd6_dad_add(struct dadq *dp);
89 static void nd6_dad_del(struct dadq *dp);
90 static void nd6_dad_rele(struct dadq *);
91 static void nd6_dad_starttimer(struct dadq *, int, int);
92 static void nd6_dad_stoptimer(struct dadq *);
93 static void nd6_dad_timer(struct dadq *);
94 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
95 static void nd6_dad_ns_output(struct dadq *);
96 static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
97 static void nd6_dad_na_input(struct ifaddr *);
98 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
99 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
100 static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
101 const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
103 VNET_DEFINE_STATIC(int, dad_enhanced) = 1;
104 #define V_dad_enhanced VNET(dad_enhanced)
106 SYSCTL_DECL(_net_inet6_ip6);
107 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
108 &VNET_NAME(dad_enhanced), 0,
109 "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
111 VNET_DEFINE_STATIC(int, dad_maxtry) = 15; /* max # of *tries* to
112 transmit DAD packet */
113 #define V_dad_maxtry VNET(dad_maxtry)
116 * Input a Neighbor Solicitation Message.
119 * Based on RFC 2462 (duplicate address detection)
122 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
126 struct nd_neighbor_solicit *nd_ns;
127 struct in6_addr daddr6, myaddr6, saddr6, taddr6;
129 struct sockaddr_dl proxydl;
130 union nd_opts ndopts;
131 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
133 int anycast, lladdrlen, proxy, rflag, tentative, tlladdr;
137 /* RFC 6980: Nodes MUST silently ignore fragments */
138 if(m->m_flags & M_FRAGMENTED)
141 ifp = m->m_pkthdr.rcvif;
142 ip6 = mtod(m, struct ip6_hdr *);
143 if (ip6->ip6_hlim != 255) {
145 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
146 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
147 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
151 if (m->m_len < off + icmp6len) {
152 m = m_pullup(m, off + icmp6len);
154 IP6STAT_INC(ip6s_exthdrtoolong);
158 ip6 = mtod(m, struct ip6_hdr *);
159 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
161 saddr6 = ip6->ip6_src;
162 daddr6 = ip6->ip6_dst;
163 taddr6 = nd_ns->nd_ns_target;
164 if (in6_setscope(&taddr6, ifp, NULL) != 0)
167 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
168 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
171 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
172 /* dst has to be a solicited node multicast address. */
173 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
174 /* don't check ifindex portion */
175 daddr6.s6_addr32[1] == 0 &&
176 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
177 daddr6.s6_addr8[12] == 0xff) {
180 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
181 "(wrong ip6 dst)\n"));
184 } else if (!V_nd6_onlink_ns_rfc4861) {
185 struct sockaddr_in6 src_sa6;
188 * According to recent IETF discussions, it is not a good idea
189 * to accept a NS from an address which would not be deemed
190 * to be a neighbor otherwise. This point is expected to be
191 * clarified in future revisions of the specification.
193 bzero(&src_sa6, sizeof(src_sa6));
194 src_sa6.sin6_family = AF_INET6;
195 src_sa6.sin6_len = sizeof(src_sa6);
196 src_sa6.sin6_addr = saddr6;
197 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
198 nd6log((LOG_INFO, "nd6_ns_input: "
199 "NS packet from non-neighbor\n"));
204 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
205 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
209 icmp6len -= sizeof(*nd_ns);
210 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
211 if (nd6_options(&ndopts) < 0) {
213 "nd6_ns_input: invalid ND option, ignored\n"));
214 /* nd6_options have incremented stats */
220 if (ndopts.nd_opts_src_lladdr) {
221 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
222 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
225 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
226 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
227 "(link-layer address option)\n"));
232 * Attaching target link-layer address to the NA?
235 * NS IP dst is unicast/anycast MUST NOT add
236 * NS IP dst is solicited-node multicast MUST add
238 * In implementation, we add target link-layer address by default.
239 * We do not add one in MUST NOT cases.
241 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
247 * Target address (taddr6) must be either:
248 * (1) Valid unicast/anycast address for my receiving interface,
249 * (2) Unicast address for which I'm offering proxy service, or
250 * (3) "tentative" address on which DAD is being performed.
252 /* (1) and (3) check. */
254 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
256 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
261 struct sockaddr_dl rt_gateway;
262 struct rt_addrinfo info;
263 struct sockaddr_in6 dst6;
265 bzero(&dst6, sizeof(dst6));
266 dst6.sin6_len = sizeof(struct sockaddr_in6);
267 dst6.sin6_family = AF_INET6;
268 dst6.sin6_addr = taddr6;
270 bzero(&rt_gateway, sizeof(rt_gateway));
271 rt_gateway.sdl_len = sizeof(rt_gateway);
272 bzero(&info, sizeof(info));
273 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
275 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
277 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
278 rt_gateway.sdl_family == AF_LINK) {
281 * proxy NDP for single entry
283 proxydl = *SDL(&rt_gateway);
284 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
285 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
293 * We've got an NS packet, and we don't have that adddress
294 * assigned for us. We MUST silently ignore it.
299 myaddr6 = *IFA_IN6(ifa);
300 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
301 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
302 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
305 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
306 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
307 "(if %d, NS packet %d)\n",
308 ip6_sprintf(ip6bufs, &taddr6),
309 ifp->if_addrlen, lladdrlen - 2));
313 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
314 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
315 ip6_sprintf(ip6bufs, &saddr6)));
320 * We have neighbor solicitation packet, with target address equals to
321 * one of my tentative address.
323 * src addr how to process?
325 * multicast of course, invalid (rejected in ip6_input)
326 * unicast somebody is doing address resolution -> ignore
327 * unspec dup address detection
329 * The processing is defined in RFC 2462.
333 * If source address is unspecified address, it is for
334 * duplicate address detection.
336 * If not, the packet is for addess resolution;
337 * silently ignore it.
339 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
340 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
346 * If the source address is unspecified address, entries must not
347 * be created or updated.
348 * It looks that sender is performing DAD. Output NA toward
349 * all-node multicast address, to tell the sender that I'm using
351 * S bit ("solicited") must be zero.
353 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
354 struct in6_addr in6_all;
356 in6_all = in6addr_linklocal_allnodes;
357 if (in6_setscope(&in6_all, ifp, NULL) != 0)
359 nd6_na_output_fib(ifp, &in6_all, &taddr6,
360 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
361 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
366 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
367 ND_NEIGHBOR_SOLICIT, 0);
369 nd6_na_output_fib(ifp, &saddr6, &taddr6,
370 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
371 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
372 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
380 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
381 ip6_sprintf(ip6bufs, &saddr6)));
382 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
383 ip6_sprintf(ip6bufs, &daddr6)));
384 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
385 ip6_sprintf(ip6bufs, &taddr6)));
387 ICMP6STAT_INC(icp6s_badns);
394 * Output a Neighbor Solicitation Message. Caller specifies:
395 * - ICMP6 header source IP6 address
396 * - ND6 header target IP6 address
397 * - ND6 header source datalink address
400 * Based on RFC 2462 (duplicate address detection)
402 * ln - for source address determination
403 * nonce - If non-NULL, NS is used for duplicate address detection and
404 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
407 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
408 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
409 uint8_t *nonce, u_int fibnum)
414 struct nd_neighbor_solicit *nd_ns;
415 struct ip6_moptions im6o;
420 if (IN6_IS_ADDR_MULTICAST(taddr6))
423 /* estimate the size of message */
424 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
425 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
426 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
427 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
428 __func__, max_linkhdr, maxlen, MCLBYTES));
430 if (max_linkhdr + maxlen > MHLEN)
431 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
433 m = m_gethdr(M_NOWAIT, MT_DATA);
438 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
439 m->m_flags |= M_MCAST;
440 im6o.im6o_multicast_ifp = ifp;
441 im6o.im6o_multicast_hlim = 255;
442 im6o.im6o_multicast_loop = 0;
445 icmp6len = sizeof(*nd_ns);
446 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
447 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
449 /* fill neighbor solicitation packet */
450 ip6 = mtod(m, struct ip6_hdr *);
452 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
453 ip6->ip6_vfc |= IPV6_VERSION;
454 /* ip6->ip6_plen will be set later */
455 ip6->ip6_nxt = IPPROTO_ICMPV6;
458 ip6->ip6_dst = *daddr6;
460 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
461 ip6->ip6_dst.s6_addr16[1] = 0;
462 ip6->ip6_dst.s6_addr32[1] = 0;
463 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
464 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
465 ip6->ip6_dst.s6_addr8[12] = 0xff;
466 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
470 struct ifaddr *ifa = NULL;
474 * "If the source address of the packet prompting the
475 * solicitation is the same as one of the addresses assigned
476 * to the outgoing interface, that address SHOULD be placed
477 * in the IP Source Address of the outgoing solicitation.
478 * Otherwise, any one of the addresses assigned to the
479 * interface should be used."
481 * We use the source address for the prompting packet
482 * (saddr6), if saddr6 belongs to the outgoing interface.
483 * Otherwise, we perform the source address selection as usual.
487 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
489 /* ip6_src set already. */
490 ip6->ip6_src = *saddr6;
494 struct in6_addr dst6, src6;
497 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
498 error = in6_selectsrc_addr(fibnum, &dst6,
499 scopeid, ifp, &src6, NULL);
501 char ip6buf[INET6_ADDRSTRLEN];
502 nd6log((LOG_DEBUG, "%s: source can't be "
503 "determined: dst=%s, error=%d\n", __func__,
504 ip6_sprintf(ip6buf, &dst6),
512 * Source address for DAD packet must always be IPv6
513 * unspecified address. (0::0)
514 * We actually don't have to 0-clear the address (we did it
515 * above), but we do so here explicitly to make the intention
518 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
520 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
521 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
522 nd_ns->nd_ns_code = 0;
523 nd_ns->nd_ns_reserved = 0;
524 nd_ns->nd_ns_target = *taddr6;
525 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
528 * Add source link-layer address option.
530 * spec implementation
532 * DAD packet MUST NOT do not add the option
533 * there's no link layer address:
534 * impossible do not add the option
535 * there's link layer address:
536 * Multicast NS MUST add one add the option
537 * Unicast NS SHOULD add one add the option
539 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
540 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
541 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
542 /* 8 byte alignments... */
543 optlen = (optlen + 7) & ~7;
545 m->m_pkthdr.len += optlen;
548 bzero((caddr_t)nd_opt, optlen);
549 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
550 nd_opt->nd_opt_len = optlen >> 3;
551 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
554 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
555 * This behavior is documented as Enhanced Duplicate Address
556 * Detection in RFC 7527.
557 * net.inet6.ip6.dad_enhanced=0 disables this.
559 if (V_dad_enhanced != 0 && nonce != NULL) {
560 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
561 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
562 /* 8-byte alignment is required. */
563 optlen = (optlen + 7) & ~7;
565 m->m_pkthdr.len += optlen;
568 bzero((caddr_t)nd_opt, optlen);
569 nd_opt->nd_opt_type = ND_OPT_NONCE;
570 nd_opt->nd_opt_len = optlen >> 3;
571 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
573 ip6->ip6_plen = htons((u_short)icmp6len);
574 nd_ns->nd_ns_cksum = 0;
576 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
578 if (send_sendso_input_hook != NULL) {
579 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
580 sizeof(unsigned short), M_NOWAIT);
583 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
584 m_tag_prepend(m, mtag);
587 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
589 icmp6_ifstat_inc(ifp, ifs6_out_msg);
590 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
591 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
601 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
602 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
605 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
609 * Neighbor advertisement input handling.
612 * Based on RFC 2462 (duplicate address detection)
614 * the following items are not implemented yet:
615 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
616 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
619 nd6_na_input(struct mbuf *m, int off, int icmp6len)
626 struct nd_neighbor_advert *nd_na;
627 struct in6_addr daddr6, taddr6;
628 struct sockaddr_in6 sin6;
629 union nd_opts ndopts;
630 u_char linkhdr[LLE_MAX_LINKHDR];
631 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
634 int flags, is_override, is_router, is_solicited;
635 int lladdr_off, lladdrlen, checklink;
643 /* RFC 6980: Nodes MUST silently ignore fragments */
644 if(m->m_flags & M_FRAGMENTED)
647 ifp = m->m_pkthdr.rcvif;
648 ip6 = mtod(m, struct ip6_hdr *);
649 if (ip6->ip6_hlim != 255) {
651 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
652 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
653 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
657 if (m->m_len < off + icmp6len) {
658 m = m_pullup(m, off + icmp6len);
660 IP6STAT_INC(ip6s_exthdrtoolong);
664 ip6 = mtod(m, struct ip6_hdr *);
665 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
667 flags = nd_na->nd_na_flags_reserved;
668 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
669 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
670 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
672 taddr6 = nd_na->nd_na_target;
673 if (in6_setscope(&taddr6, ifp, NULL))
674 goto bad; /* XXX: impossible */
676 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
678 "nd6_na_input: invalid target address %s\n",
679 ip6_sprintf(ip6bufs, &taddr6)));
683 daddr6 = ip6->ip6_dst;
684 if (IN6_IS_ADDR_MULTICAST(&daddr6))
687 "nd6_na_input: a solicited adv is multicasted\n"));
691 icmp6len -= sizeof(*nd_na);
692 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
693 if (nd6_options(&ndopts) < 0) {
695 "nd6_na_input: invalid ND option, ignored\n"));
696 /* nd6_options have incremented stats */
702 if (ndopts.nd_opts_tgt_lladdr) {
703 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
704 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
708 * This effectively disables the DAD check on a non-master CARP
712 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
714 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
717 * Target address matches one of my interface address.
719 * If my address is tentative, this means that there's somebody
720 * already using the same address as mine. This indicates DAD failure.
721 * This is defined in RFC 2462.
723 * Otherwise, process as defined in RFC 2461.
726 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
727 nd6_dad_na_input(ifa);
732 /* Just for safety, maybe unnecessary. */
736 "nd6_na_input: duplicate IP6 address %s\n",
737 ip6_sprintf(ip6bufs, &taddr6));
741 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
742 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
743 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
744 ifp->if_addrlen, lladdrlen - 2));
749 * If no neighbor cache entry is found, NA SHOULD silently be
752 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
757 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
759 * If the link-layer has address, and no lladdr option came,
760 * discard the packet.
762 if (ifp->if_addrlen && lladdr == NULL) {
767 * Record link-layer address, and update the state.
769 linkhdrsize = sizeof(linkhdr);
770 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
771 linkhdr, &linkhdrsize, &lladdr_off) != 0)
774 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
779 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
781 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
783 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
784 if ((ln->ln_router = is_router) != 0) {
786 * This means a router's state has changed from
787 * non-reachable to probably reachable, and might
788 * affect the status of associated prefixes..
796 * Check if the link-layer address has changed or not.
801 if (ln->la_flags & LLE_VALID) {
802 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
811 * This is VERY complex. Look at it with care.
813 * override solicit lladdr llchange action
818 * 0 0 y y (1) REACHABLE->STALE
819 * 0 1 n -- (2c) *->REACHABLE
820 * 0 1 y n (2b) L *->REACHABLE
821 * 0 1 y y (1) REACHABLE->STALE
824 * 1 0 y y (2a) L *->STALE
825 * 1 1 n -- (2a) *->REACHABLE
826 * 1 1 y n (2a) L *->REACHABLE
827 * 1 1 y y (2a) L *->REACHABLE
829 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
831 * If state is REACHABLE, make it STALE.
832 * no other updates should be done.
834 if (ln->ln_state == ND6_LLINFO_REACHABLE)
835 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
837 } else if (is_override /* (2a) */
838 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
839 || lladdr == NULL) { /* (2c) */
841 * Update link-local address, if any.
843 if (lladdr != NULL) {
844 linkhdrsize = sizeof(linkhdr);
845 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
846 linkhdr, &linkhdrsize, &lladdr_off) != 0)
848 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
849 linkhdrsize, lladdr_off) == 0) {
853 EVENTHANDLER_INVOKE(lle_event, ln,
858 * If solicited, make the state REACHABLE.
859 * If not solicited and the link-layer address was
860 * changed, make it STALE.
863 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
865 if (lladdr != NULL && llchange)
866 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
870 if (ln->ln_router && !is_router) {
872 * The peer dropped the router flag.
873 * Remove the sender from the Default Router List and
874 * update the Destination Cache entries.
876 struct ifnet *nd6_ifp;
878 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
879 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
880 (ND_IFINFO(nd6_ifp)->flags &
881 ND6_IFF_ACCEPT_RTADV) != 0)
883 * Even if the neighbor is not in the default
884 * router list, the neighbor may be used as a
885 * next hop for some destinations (e.g. redirect
886 * case). So we must call rt6_flush explicitly.
888 rt6_flush(&ip6->ip6_src, ifp);
890 ln->ln_router = is_router;
894 * rt->rt_flags &= ~RTF_REJECT;
897 if (ln->la_hold != NULL) {
898 memset(&sin6, 0, sizeof(sin6));
899 nd6_grab_holdchain(ln, &chain, &sin6);
906 nd6_flush_holdchain(ifp, chain, &sin6);
909 pfxlist_onlink_check();
918 ICMP6STAT_INC(icp6s_badna);
923 * Neighbor advertisement output handling.
927 * the following items are not implemented yet:
928 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
929 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
931 * tlladdr - 1 if include target link-layer address
932 * sdl0 - sockaddr_dl (= proxy NA) or NULL
935 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
936 const struct in6_addr *taddr6, u_long flags, int tlladdr,
937 struct sockaddr *sdl0, u_int fibnum)
942 struct nd_neighbor_advert *nd_na;
943 struct ip6_moptions im6o;
944 struct in6_addr daddr6, dst6, src6;
947 int icmp6len, maxlen, error;
950 daddr6 = *daddr6_0; /* make a local copy for modification */
952 /* estimate the size of message */
953 maxlen = sizeof(*ip6) + sizeof(*nd_na);
954 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
955 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
956 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
957 __func__, max_linkhdr, maxlen, MCLBYTES));
959 if (max_linkhdr + maxlen > MHLEN)
960 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
962 m = m_gethdr(M_NOWAIT, MT_DATA);
967 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
968 m->m_flags |= M_MCAST;
969 im6o.im6o_multicast_ifp = ifp;
970 im6o.im6o_multicast_hlim = 255;
971 im6o.im6o_multicast_loop = 0;
974 icmp6len = sizeof(*nd_na);
975 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
976 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
978 /* fill neighbor advertisement packet */
979 ip6 = mtod(m, struct ip6_hdr *);
981 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
982 ip6->ip6_vfc |= IPV6_VERSION;
983 ip6->ip6_nxt = IPPROTO_ICMPV6;
985 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
987 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
988 daddr6.s6_addr16[1] = 0;
989 daddr6.s6_addr32[1] = 0;
990 daddr6.s6_addr32[2] = 0;
991 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
992 if (in6_setscope(&daddr6, ifp, NULL))
995 flags &= ~ND_NA_FLAG_SOLICITED;
997 ip6->ip6_dst = daddr6;
1000 * Select a source whose scope is the same as that of the dest.
1002 in6_splitscope(&daddr6, &dst6, &scopeid);
1003 error = in6_selectsrc_addr(fibnum, &dst6,
1004 scopeid, ifp, &src6, NULL);
1006 char ip6buf[INET6_ADDRSTRLEN];
1007 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1008 "determined: dst=%s, error=%d\n",
1009 ip6_sprintf(ip6buf, &daddr6), error));
1012 ip6->ip6_src = src6;
1013 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1014 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1015 nd_na->nd_na_code = 0;
1016 nd_na->nd_na_target = *taddr6;
1017 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1020 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1021 * see nd6_ns_input() for details.
1022 * Basically, if NS packet is sent to unicast/anycast addr,
1023 * target lladdr option SHOULD NOT be included.
1027 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1028 * lladdr in sdl0. If we are not proxying (sending NA for
1029 * my address) use lladdr configured for the interface.
1033 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1035 mac = nd6_ifptomac(ifp);
1036 } else if (sdl0->sa_family == AF_LINK) {
1037 struct sockaddr_dl *sdl;
1038 sdl = (struct sockaddr_dl *)sdl0;
1039 if (sdl->sdl_alen == ifp->if_addrlen)
1043 if (tlladdr && mac) {
1044 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1045 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1047 /* roundup to 8 bytes alignment! */
1048 optlen = (optlen + 7) & ~7;
1050 m->m_pkthdr.len += optlen;
1053 bzero((caddr_t)nd_opt, optlen);
1054 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1055 nd_opt->nd_opt_len = optlen >> 3;
1056 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1058 flags &= ~ND_NA_FLAG_OVERRIDE;
1060 ip6->ip6_plen = htons((u_short)icmp6len);
1061 nd_na->nd_na_flags_reserved = flags;
1062 nd_na->nd_na_cksum = 0;
1063 nd_na->nd_na_cksum =
1064 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1066 if (send_sendso_input_hook != NULL) {
1067 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1068 sizeof(unsigned short), M_NOWAIT);
1071 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1072 m_tag_prepend(m, mtag);
1075 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1076 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1077 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1078 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1086 #ifndef BURN_BRIDGES
1088 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1089 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1090 struct sockaddr *sdl0)
1093 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1099 nd6_ifptomac(struct ifnet *ifp)
1101 switch (ifp->if_type) {
1105 case IFT_INFINIBAND:
1107 return IF_LLADDR(ifp);
1114 TAILQ_ENTRY(dadq) dad_list;
1115 struct ifaddr *dad_ifa;
1116 int dad_count; /* max NS to send */
1117 int dad_ns_tcount; /* # of trials to send NS */
1118 int dad_ns_ocount; /* NS sent so far */
1121 int dad_ns_lcount; /* looped back NS */
1122 int dad_loopbackprobe; /* probing state for loopback detection */
1123 struct callout dad_timer_ch;
1124 struct vnet *dad_vnet;
1126 #define ND_OPT_NONCE_LEN32 \
1127 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1128 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1129 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1132 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1133 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1134 #define V_dadq VNET(dadq)
1135 #define V_dad_rwlock VNET(dad_rwlock)
1137 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1138 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1139 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1140 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1143 nd6_dad_add(struct dadq *dp)
1147 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1148 dp->dad_ondadq = true;
1153 nd6_dad_del(struct dadq *dp)
1157 if (dp->dad_ondadq) {
1159 * Remove dp from the dadq and release the dadq's
1162 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1163 dp->dad_ondadq = false;
1170 static struct dadq *
1171 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1176 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1177 if (dp->dad_ifa != ifa)
1180 * Skip if the nonce matches the received one.
1181 * +2 in the length is required because of type and
1182 * length fields are included in a header.
1185 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1186 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1187 ND_OPT_NONCE_LEN) == 0) {
1188 dp->dad_ns_lcount++;
1191 refcount_acquire(&dp->dad_refcnt);
1200 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1206 nd6_dad_ns_output(dp);
1207 callout_reset(&dp->dad_timer_ch, ticks,
1208 (void (*)(void *))nd6_dad_timer, (void *)dp);
1212 nd6_dad_stoptimer(struct dadq *dp)
1215 callout_drain(&dp->dad_timer_ch);
1219 nd6_dad_rele(struct dadq *dp)
1222 if (refcount_release(&dp->dad_refcnt)) {
1223 ifa_free(dp->dad_ifa);
1232 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1233 TAILQ_INIT(&V_dadq);
1237 * Start Duplicate Address Detection (DAD) for specified interface address.
1240 nd6_dad_start(struct ifaddr *ifa, int delay)
1242 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1244 char ip6buf[INET6_ADDRSTRLEN];
1245 struct epoch_tracker et;
1247 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1248 ("starting DAD on non-tentative address %p", ifa));
1251 * If we don't need DAD, don't do it.
1252 * There are several cases:
1253 * - DAD is disabled globally or on the interface
1254 * - the interface address is anycast
1256 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1257 V_ip6_dad_count == 0 ||
1258 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1259 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1262 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1263 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1264 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1267 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1269 * DAD is already in progress. Let the existing entry
1276 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1278 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1280 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1281 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1284 callout_init(&dp->dad_timer_ch, 0);
1286 dp->dad_vnet = curvnet;
1288 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1289 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1292 * Send NS packet for DAD, ip6_dad_count times.
1293 * Note that we must delay the first transmission, if this is the
1294 * first packet to be sent from the interface after interface
1295 * (re)initialization.
1298 ifa_ref(dp->dad_ifa);
1299 dp->dad_count = V_ip6_dad_count;
1300 dp->dad_ns_icount = dp->dad_na_icount = 0;
1301 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1302 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1304 /* Add this to the dadq and add a reference for the dadq. */
1305 refcount_init(&dp->dad_refcnt, 1);
1307 NET_EPOCH_ENTER(et);
1308 nd6_dad_starttimer(dp, delay, 0);
1313 * terminate DAD unconditionally. used for address removals.
1316 nd6_dad_stop(struct ifaddr *ifa)
1320 dp = nd6_dad_find(ifa, NULL);
1322 /* DAD wasn't started yet */
1326 nd6_dad_stoptimer(dp);
1329 /* Release this function's reference, acquired by nd6_dad_find(). */
1334 nd6_dad_timer(struct dadq *dp)
1336 CURVNET_SET(dp->dad_vnet);
1337 struct ifaddr *ifa = dp->dad_ifa;
1338 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1339 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1340 char ip6buf[INET6_ADDRSTRLEN];
1341 struct epoch_tracker et;
1343 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1345 NET_EPOCH_ENTER(et);
1346 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1347 /* Do not need DAD for ifdisabled interface. */
1348 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1349 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1352 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1353 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1355 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1356 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1359 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1360 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1362 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1363 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1367 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1368 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1369 (((ifp->if_flags & IFF_UP) == 0) ||
1370 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1371 nd6log((LOG_INFO, "%s: could not run DAD "
1372 "because the interface was down or not running.\n",
1373 if_name(ifa->ifa_ifp)));
1377 /* Need more checks? */
1378 if (dp->dad_ns_ocount < dp->dad_count) {
1380 * We have more NS to go. Send NS packet for DAD.
1382 nd6_dad_starttimer(dp,
1383 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1387 * We have transmitted sufficient number of DAD packets.
1388 * See what we've got.
1390 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1391 /* We've seen NS or NA, means DAD has failed. */
1392 nd6_dad_duplicated(ifa, dp);
1393 else if (V_dad_enhanced != 0 &&
1394 dp->dad_ns_lcount > 0 &&
1395 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1397 * Sec. 4.1 in RFC 7527 requires transmission of
1398 * additional probes until the loopback condition
1399 * becomes clear when a looped back probe is detected.
1401 log(LOG_ERR, "%s: a looped back NS message is "
1402 "detected during DAD for %s. "
1403 "Another DAD probes are being sent.\n",
1404 if_name(ifa->ifa_ifp),
1405 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1406 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1408 * Send an NS immediately and increase dad_count by
1409 * V_nd6_mmaxtries - 1.
1412 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1413 nd6_dad_starttimer(dp,
1414 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1419 * We are done with DAD. No NA came, no NS came.
1420 * No duplicate address found. Check IFDISABLED flag
1421 * again in case that it is changed between the
1422 * beginning of this function and here.
1424 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1425 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1428 "%s: DAD complete for %s - no duplicates found\n",
1429 if_name(ifa->ifa_ifp),
1430 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1431 if (dp->dad_ns_lcount > 0)
1432 log(LOG_ERR, "%s: DAD completed while "
1433 "a looped back NS message is detected "
1434 "during DAD for %s.\n",
1435 if_name(ifa->ifa_ifp),
1436 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1447 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1449 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1451 char ip6buf[INET6_ADDRSTRLEN];
1453 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1454 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1455 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1456 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1459 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1460 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1463 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1464 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1465 log(LOG_ERR, "%s: manual intervention required\n",
1469 * If the address is a link-local address formed from an interface
1470 * identifier based on the hardware address which is supposed to be
1471 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1472 * operation on the interface SHOULD be disabled.
1473 * [RFC 4862, Section 5.4.5]
1475 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1476 struct in6_addr in6;
1479 * To avoid over-reaction, we only apply this logic when we are
1480 * very sure that hardware addresses are supposed to be unique.
1482 switch (ifp->if_type) {
1486 case IFT_INFINIBAND:
1487 in6 = ia->ia_addr.sin6_addr;
1488 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1489 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1490 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1491 log(LOG_ERR, "%s: possible hardware address "
1492 "duplication detected, disable IPv6\n",
1501 nd6_dad_ns_output(struct dadq *dp)
1503 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1504 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1507 dp->dad_ns_tcount++;
1508 if ((ifp->if_flags & IFF_UP) == 0) {
1511 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1515 dp->dad_ns_ocount++;
1516 if (V_dad_enhanced != 0) {
1517 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1518 dp->dad_nonce[i] = arc4random();
1520 * XXXHRS: Note that in the case that
1521 * DupAddrDetectTransmits > 1, multiple NS messages with
1522 * different nonces can be looped back in an unexpected
1523 * order. The current implementation recognizes only
1524 * the latest nonce on the sender side. Practically it
1525 * should work well in almost all cases.
1528 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1529 (uint8_t *)&dp->dad_nonce[0]);
1533 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1538 panic("ifa == NULL in nd6_dad_ns_input");
1540 /* Ignore Nonce option when Enhanced DAD is disabled. */
1541 if (V_dad_enhanced == 0)
1543 dp = nd6_dad_find(ifa, ndopt_nonce);
1547 dp->dad_ns_icount++;
1552 nd6_dad_na_input(struct ifaddr *ifa)
1557 panic("ifa == NULL in nd6_dad_na_input");
1559 dp = nd6_dad_find(ifa, NULL);
1561 dp->dad_na_icount++;