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 m = m_pullup(m, off + icmp6len);
153 IP6STAT_INC(ip6s_exthdrtoolong);
156 ip6 = mtod(m, struct ip6_hdr *);
157 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
159 saddr6 = ip6->ip6_src;
160 daddr6 = ip6->ip6_dst;
161 taddr6 = nd_ns->nd_ns_target;
162 if (in6_setscope(&taddr6, ifp, NULL) != 0)
165 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
166 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
169 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
170 /* dst has to be a solicited node multicast address. */
171 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
172 /* don't check ifindex portion */
173 daddr6.s6_addr32[1] == 0 &&
174 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
175 daddr6.s6_addr8[12] == 0xff) {
178 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
179 "(wrong ip6 dst)\n"));
182 } else if (!V_nd6_onlink_ns_rfc4861) {
183 struct sockaddr_in6 src_sa6;
186 * According to recent IETF discussions, it is not a good idea
187 * to accept a NS from an address which would not be deemed
188 * to be a neighbor otherwise. This point is expected to be
189 * clarified in future revisions of the specification.
191 bzero(&src_sa6, sizeof(src_sa6));
192 src_sa6.sin6_family = AF_INET6;
193 src_sa6.sin6_len = sizeof(src_sa6);
194 src_sa6.sin6_addr = saddr6;
195 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
196 nd6log((LOG_INFO, "nd6_ns_input: "
197 "NS packet from non-neighbor\n"));
202 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
203 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
207 icmp6len -= sizeof(*nd_ns);
208 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
209 if (nd6_options(&ndopts) < 0) {
211 "nd6_ns_input: invalid ND option, ignored\n"));
212 /* nd6_options have incremented stats */
218 if (ndopts.nd_opts_src_lladdr) {
219 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
220 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
223 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
224 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
225 "(link-layer address option)\n"));
230 * Attaching target link-layer address to the NA?
233 * NS IP dst is unicast/anycast MUST NOT add
234 * NS IP dst is solicited-node multicast MUST add
236 * In implementation, we add target link-layer address by default.
237 * We do not add one in MUST NOT cases.
239 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
245 * Target address (taddr6) must be either:
246 * (1) Valid unicast/anycast address for my receiving interface,
247 * (2) Unicast address for which I'm offering proxy service, or
248 * (3) "tentative" address on which DAD is being performed.
250 /* (1) and (3) check. */
252 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
254 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
259 struct sockaddr_dl rt_gateway;
260 struct rt_addrinfo info;
261 struct sockaddr_in6 dst6;
263 bzero(&dst6, sizeof(dst6));
264 dst6.sin6_len = sizeof(struct sockaddr_in6);
265 dst6.sin6_family = AF_INET6;
266 dst6.sin6_addr = taddr6;
268 bzero(&rt_gateway, sizeof(rt_gateway));
269 rt_gateway.sdl_len = sizeof(rt_gateway);
270 bzero(&info, sizeof(info));
271 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
273 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
275 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
276 rt_gateway.sdl_family == AF_LINK) {
279 * proxy NDP for single entry
281 proxydl = *SDL(&rt_gateway);
282 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
283 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
291 * We've got an NS packet, and we don't have that adddress
292 * assigned for us. We MUST silently ignore it.
297 myaddr6 = *IFA_IN6(ifa);
298 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
299 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
300 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
303 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
304 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
305 "(if %d, NS packet %d)\n",
306 ip6_sprintf(ip6bufs, &taddr6),
307 ifp->if_addrlen, lladdrlen - 2));
311 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
312 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
313 ip6_sprintf(ip6bufs, &saddr6)));
318 * We have neighbor solicitation packet, with target address equals to
319 * one of my tentative address.
321 * src addr how to process?
323 * multicast of course, invalid (rejected in ip6_input)
324 * unicast somebody is doing address resolution -> ignore
325 * unspec dup address detection
327 * The processing is defined in RFC 2462.
331 * If source address is unspecified address, it is for
332 * duplicate address detection.
334 * If not, the packet is for addess resolution;
335 * silently ignore it.
337 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
338 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
344 * If the source address is unspecified address, entries must not
345 * be created or updated.
346 * It looks that sender is performing DAD. Output NA toward
347 * all-node multicast address, to tell the sender that I'm using
349 * S bit ("solicited") must be zero.
351 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
352 struct in6_addr in6_all;
354 in6_all = in6addr_linklocal_allnodes;
355 if (in6_setscope(&in6_all, ifp, NULL) != 0)
357 nd6_na_output_fib(ifp, &in6_all, &taddr6,
358 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
359 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
364 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
365 ND_NEIGHBOR_SOLICIT, 0);
367 nd6_na_output_fib(ifp, &saddr6, &taddr6,
368 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
369 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
370 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
378 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
379 ip6_sprintf(ip6bufs, &saddr6)));
380 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
381 ip6_sprintf(ip6bufs, &daddr6)));
382 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
383 ip6_sprintf(ip6bufs, &taddr6)));
385 ICMP6STAT_INC(icp6s_badns);
392 * Output a Neighbor Solicitation Message. Caller specifies:
393 * - ICMP6 header source IP6 address
394 * - ND6 header target IP6 address
395 * - ND6 header source datalink address
398 * Based on RFC 2462 (duplicate address detection)
400 * ln - for source address determination
401 * nonce - If non-NULL, NS is used for duplicate address detection and
402 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
405 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
406 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
407 uint8_t *nonce, u_int fibnum)
412 struct nd_neighbor_solicit *nd_ns;
413 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 struct sockaddr_in6 sin6;
627 union nd_opts ndopts;
628 u_char linkhdr[LLE_MAX_LINKHDR];
629 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
632 int flags, is_override, is_router, is_solicited;
633 int lladdr_off, lladdrlen, checklink;
641 /* RFC 6980: Nodes MUST silently ignore fragments */
642 if(m->m_flags & M_FRAGMENTED)
645 ifp = m->m_pkthdr.rcvif;
646 ip6 = mtod(m, struct ip6_hdr *);
647 if (ip6->ip6_hlim != 255) {
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 m = m_pullup(m, off + icmp6len);
657 IP6STAT_INC(ip6s_exthdrtoolong);
660 ip6 = mtod(m, struct ip6_hdr *);
661 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
663 flags = nd_na->nd_na_flags_reserved;
664 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
665 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
666 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
668 taddr6 = nd_na->nd_na_target;
669 if (in6_setscope(&taddr6, ifp, NULL))
670 goto bad; /* XXX: impossible */
672 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
674 "nd6_na_input: invalid target address %s\n",
675 ip6_sprintf(ip6bufs, &taddr6)));
679 daddr6 = ip6->ip6_dst;
680 if (IN6_IS_ADDR_MULTICAST(&daddr6))
683 "nd6_na_input: a solicited adv is multicasted\n"));
687 icmp6len -= sizeof(*nd_na);
688 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
689 if (nd6_options(&ndopts) < 0) {
691 "nd6_na_input: invalid ND option, ignored\n"));
692 /* nd6_options have incremented stats */
698 if (ndopts.nd_opts_tgt_lladdr) {
699 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
700 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
704 * This effectively disables the DAD check on a non-master CARP
708 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
710 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
713 * Target address matches one of my interface address.
715 * If my address is tentative, this means that there's somebody
716 * already using the same address as mine. This indicates DAD failure.
717 * This is defined in RFC 2462.
719 * Otherwise, process as defined in RFC 2461.
722 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
723 nd6_dad_na_input(ifa);
728 /* Just for safety, maybe unnecessary. */
732 "nd6_na_input: duplicate IP6 address %s\n",
733 ip6_sprintf(ip6bufs, &taddr6));
737 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
738 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
739 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
740 ifp->if_addrlen, lladdrlen - 2));
745 * If no neighbor cache entry is found, NA SHOULD silently be
748 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
753 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
755 * If the link-layer has address, and no lladdr option came,
756 * discard the packet.
758 if (ifp->if_addrlen && lladdr == NULL) {
763 * Record link-layer address, and update the state.
765 linkhdrsize = sizeof(linkhdr);
766 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
767 linkhdr, &linkhdrsize, &lladdr_off) != 0)
770 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
775 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
777 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
779 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
780 if ((ln->ln_router = is_router) != 0) {
782 * This means a router's state has changed from
783 * non-reachable to probably reachable, and might
784 * affect the status of associated prefixes..
792 * Check if the link-layer address has changed or not.
797 if (ln->la_flags & LLE_VALID) {
798 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
807 * This is VERY complex. Look at it with care.
809 * override solicit lladdr llchange action
814 * 0 0 y y (1) REACHABLE->STALE
815 * 0 1 n -- (2c) *->REACHABLE
816 * 0 1 y n (2b) L *->REACHABLE
817 * 0 1 y y (1) REACHABLE->STALE
820 * 1 0 y y (2a) L *->STALE
821 * 1 1 n -- (2a) *->REACHABLE
822 * 1 1 y n (2a) L *->REACHABLE
823 * 1 1 y y (2a) L *->REACHABLE
825 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
827 * If state is REACHABLE, make it STALE.
828 * no other updates should be done.
830 if (ln->ln_state == ND6_LLINFO_REACHABLE)
831 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
833 } else if (is_override /* (2a) */
834 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
835 || lladdr == NULL) { /* (2c) */
837 * Update link-local address, if any.
839 if (lladdr != NULL) {
840 linkhdrsize = sizeof(linkhdr);
841 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
842 linkhdr, &linkhdrsize, &lladdr_off) != 0)
844 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
845 linkhdrsize, lladdr_off) == 0) {
849 EVENTHANDLER_INVOKE(lle_event, ln,
854 * If solicited, make the state REACHABLE.
855 * If not solicited and the link-layer address was
856 * changed, make it STALE.
859 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
861 if (lladdr != NULL && llchange)
862 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
866 if (ln->ln_router && !is_router) {
868 * The peer dropped the router flag.
869 * Remove the sender from the Default Router List and
870 * update the Destination Cache entries.
872 struct ifnet *nd6_ifp;
874 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
875 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
876 (ND_IFINFO(nd6_ifp)->flags &
877 ND6_IFF_ACCEPT_RTADV) != 0)
879 * Even if the neighbor is not in the default
880 * router list, the neighbor may be used as a
881 * next hop for some destinations (e.g. redirect
882 * case). So we must call rt6_flush explicitly.
884 rt6_flush(&ip6->ip6_src, ifp);
886 ln->ln_router = is_router;
890 * rt->rt_flags &= ~RTF_REJECT;
893 if (ln->la_hold != NULL) {
894 memset(&sin6, 0, sizeof(sin6));
895 nd6_grab_holdchain(ln, &chain, &sin6);
902 nd6_flush_holdchain(ifp, chain, &sin6);
905 pfxlist_onlink_check();
914 ICMP6STAT_INC(icp6s_badna);
919 * Neighbor advertisement output handling.
923 * the following items are not implemented yet:
924 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
925 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
927 * tlladdr - 1 if include target link-layer address
928 * sdl0 - sockaddr_dl (= proxy NA) or NULL
931 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
932 const struct in6_addr *taddr6, u_long flags, int tlladdr,
933 struct sockaddr *sdl0, u_int fibnum)
938 struct nd_neighbor_advert *nd_na;
939 struct ip6_moptions im6o;
940 struct in6_addr daddr6, dst6, src6;
943 int icmp6len, maxlen, error;
946 daddr6 = *daddr6_0; /* make a local copy for modification */
948 /* estimate the size of message */
949 maxlen = sizeof(*ip6) + sizeof(*nd_na);
950 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
951 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
952 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
953 __func__, max_linkhdr, maxlen, MCLBYTES));
955 if (max_linkhdr + maxlen > MHLEN)
956 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
958 m = m_gethdr(M_NOWAIT, MT_DATA);
963 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
964 m->m_flags |= M_MCAST;
965 im6o.im6o_multicast_ifp = ifp;
966 im6o.im6o_multicast_hlim = 255;
967 im6o.im6o_multicast_loop = 0;
970 icmp6len = sizeof(*nd_na);
971 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
972 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
974 /* fill neighbor advertisement packet */
975 ip6 = mtod(m, struct ip6_hdr *);
977 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
978 ip6->ip6_vfc |= IPV6_VERSION;
979 ip6->ip6_nxt = IPPROTO_ICMPV6;
981 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
983 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
984 daddr6.s6_addr16[1] = 0;
985 daddr6.s6_addr32[1] = 0;
986 daddr6.s6_addr32[2] = 0;
987 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
988 if (in6_setscope(&daddr6, ifp, NULL))
991 flags &= ~ND_NA_FLAG_SOLICITED;
993 ip6->ip6_dst = daddr6;
996 * Select a source whose scope is the same as that of the dest.
998 in6_splitscope(&daddr6, &dst6, &scopeid);
999 error = in6_selectsrc_addr(fibnum, &dst6,
1000 scopeid, ifp, &src6, NULL);
1002 char ip6buf[INET6_ADDRSTRLEN];
1003 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1004 "determined: dst=%s, error=%d\n",
1005 ip6_sprintf(ip6buf, &daddr6), error));
1008 ip6->ip6_src = src6;
1009 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1010 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1011 nd_na->nd_na_code = 0;
1012 nd_na->nd_na_target = *taddr6;
1013 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1016 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1017 * see nd6_ns_input() for details.
1018 * Basically, if NS packet is sent to unicast/anycast addr,
1019 * target lladdr option SHOULD NOT be included.
1023 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1024 * lladdr in sdl0. If we are not proxying (sending NA for
1025 * my address) use lladdr configured for the interface.
1029 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1031 mac = nd6_ifptomac(ifp);
1032 } else if (sdl0->sa_family == AF_LINK) {
1033 struct sockaddr_dl *sdl;
1034 sdl = (struct sockaddr_dl *)sdl0;
1035 if (sdl->sdl_alen == ifp->if_addrlen)
1039 if (tlladdr && mac) {
1040 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1041 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1043 /* roundup to 8 bytes alignment! */
1044 optlen = (optlen + 7) & ~7;
1046 m->m_pkthdr.len += optlen;
1049 bzero((caddr_t)nd_opt, optlen);
1050 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1051 nd_opt->nd_opt_len = optlen >> 3;
1052 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1054 flags &= ~ND_NA_FLAG_OVERRIDE;
1056 ip6->ip6_plen = htons((u_short)icmp6len);
1057 nd_na->nd_na_flags_reserved = flags;
1058 nd_na->nd_na_cksum = 0;
1059 nd_na->nd_na_cksum =
1060 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1062 if (send_sendso_input_hook != NULL) {
1063 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1064 sizeof(unsigned short), M_NOWAIT);
1067 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1068 m_tag_prepend(m, mtag);
1071 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1072 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1073 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1074 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1082 #ifndef BURN_BRIDGES
1084 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1085 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1086 struct sockaddr *sdl0)
1089 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1095 nd6_ifptomac(struct ifnet *ifp)
1097 switch (ifp->if_type) {
1101 case IFT_INFINIBAND:
1103 return IF_LLADDR(ifp);
1110 TAILQ_ENTRY(dadq) dad_list;
1111 struct ifaddr *dad_ifa;
1112 int dad_count; /* max NS to send */
1113 int dad_ns_tcount; /* # of trials to send NS */
1114 int dad_ns_ocount; /* NS sent so far */
1117 int dad_ns_lcount; /* looped back NS */
1118 int dad_loopbackprobe; /* probing state for loopback detection */
1119 struct callout dad_timer_ch;
1120 struct vnet *dad_vnet;
1122 #define ND_OPT_NONCE_LEN32 \
1123 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1124 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1125 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1128 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1129 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1130 #define V_dadq VNET(dadq)
1131 #define V_dad_rwlock VNET(dad_rwlock)
1133 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1134 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1135 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1136 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1139 nd6_dad_add(struct dadq *dp)
1143 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1144 dp->dad_ondadq = true;
1149 nd6_dad_del(struct dadq *dp)
1153 if (dp->dad_ondadq) {
1155 * Remove dp from the dadq and release the dadq's
1158 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1159 dp->dad_ondadq = false;
1166 static struct dadq *
1167 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1172 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1173 if (dp->dad_ifa != ifa)
1176 * Skip if the nonce matches the received one.
1177 * +2 in the length is required because of type and
1178 * length fields are included in a header.
1181 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1182 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1183 ND_OPT_NONCE_LEN) == 0) {
1184 dp->dad_ns_lcount++;
1187 refcount_acquire(&dp->dad_refcnt);
1196 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1202 nd6_dad_ns_output(dp);
1203 callout_reset(&dp->dad_timer_ch, ticks,
1204 (void (*)(void *))nd6_dad_timer, (void *)dp);
1208 nd6_dad_stoptimer(struct dadq *dp)
1211 callout_drain(&dp->dad_timer_ch);
1215 nd6_dad_rele(struct dadq *dp)
1218 if (refcount_release(&dp->dad_refcnt)) {
1219 ifa_free(dp->dad_ifa);
1228 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1229 TAILQ_INIT(&V_dadq);
1233 * Start Duplicate Address Detection (DAD) for specified interface address.
1236 nd6_dad_start(struct ifaddr *ifa, int delay)
1238 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1240 char ip6buf[INET6_ADDRSTRLEN];
1241 struct epoch_tracker et;
1243 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1244 ("starting DAD on non-tentative address %p", ifa));
1247 * If we don't need DAD, don't do it.
1248 * There are several cases:
1249 * - DAD is disabled globally or on the interface
1250 * - the interface address is anycast
1252 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1253 V_ip6_dad_count == 0 ||
1254 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1255 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1258 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1259 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1260 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1263 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1265 * DAD is already in progress. Let the existing entry
1272 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1274 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1276 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1277 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1280 callout_init(&dp->dad_timer_ch, 0);
1282 dp->dad_vnet = curvnet;
1284 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1285 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1288 * Send NS packet for DAD, ip6_dad_count times.
1289 * Note that we must delay the first transmission, if this is the
1290 * first packet to be sent from the interface after interface
1291 * (re)initialization.
1294 ifa_ref(dp->dad_ifa);
1295 dp->dad_count = V_ip6_dad_count;
1296 dp->dad_ns_icount = dp->dad_na_icount = 0;
1297 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1298 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1300 /* Add this to the dadq and add a reference for the dadq. */
1301 refcount_init(&dp->dad_refcnt, 1);
1303 NET_EPOCH_ENTER(et);
1304 nd6_dad_starttimer(dp, delay, 0);
1309 * terminate DAD unconditionally. used for address removals.
1312 nd6_dad_stop(struct ifaddr *ifa)
1316 dp = nd6_dad_find(ifa, NULL);
1318 /* DAD wasn't started yet */
1322 nd6_dad_stoptimer(dp);
1325 /* Release this function's reference, acquired by nd6_dad_find(). */
1330 nd6_dad_timer(struct dadq *dp)
1332 CURVNET_SET(dp->dad_vnet);
1333 struct ifaddr *ifa = dp->dad_ifa;
1334 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1335 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1336 char ip6buf[INET6_ADDRSTRLEN];
1337 struct epoch_tracker et;
1339 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1341 NET_EPOCH_ENTER(et);
1342 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1343 /* Do not need DAD for ifdisabled interface. */
1344 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1345 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1348 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1349 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1351 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1352 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1355 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1356 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1358 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1359 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1363 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1364 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1365 (((ifp->if_flags & IFF_UP) == 0) ||
1366 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1367 nd6log((LOG_INFO, "%s: could not run DAD "
1368 "because the interface was down or not running.\n",
1369 if_name(ifa->ifa_ifp)));
1373 /* Need more checks? */
1374 if (dp->dad_ns_ocount < dp->dad_count) {
1376 * We have more NS to go. Send NS packet for DAD.
1378 nd6_dad_starttimer(dp,
1379 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1383 * We have transmitted sufficient number of DAD packets.
1384 * See what we've got.
1386 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1387 /* We've seen NS or NA, means DAD has failed. */
1388 nd6_dad_duplicated(ifa, dp);
1389 else if (V_dad_enhanced != 0 &&
1390 dp->dad_ns_lcount > 0 &&
1391 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1393 * Sec. 4.1 in RFC 7527 requires transmission of
1394 * additional probes until the loopback condition
1395 * becomes clear when a looped back probe is detected.
1397 log(LOG_ERR, "%s: a looped back NS message is "
1398 "detected during DAD for %s. "
1399 "Another DAD probes are being sent.\n",
1400 if_name(ifa->ifa_ifp),
1401 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1402 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1404 * Send an NS immediately and increase dad_count by
1405 * V_nd6_mmaxtries - 1.
1408 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1409 nd6_dad_starttimer(dp,
1410 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1415 * We are done with DAD. No NA came, no NS came.
1416 * No duplicate address found. Check IFDISABLED flag
1417 * again in case that it is changed between the
1418 * beginning of this function and here.
1420 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1421 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1424 "%s: DAD complete for %s - no duplicates found\n",
1425 if_name(ifa->ifa_ifp),
1426 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1427 if (dp->dad_ns_lcount > 0)
1428 log(LOG_ERR, "%s: DAD completed while "
1429 "a looped back NS message is detected "
1430 "during DAD for %s.\n",
1431 if_name(ifa->ifa_ifp),
1432 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1443 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1445 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1447 char ip6buf[INET6_ADDRSTRLEN];
1449 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1450 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1451 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1452 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1455 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1456 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1459 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1460 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1461 log(LOG_ERR, "%s: manual intervention required\n",
1465 * If the address is a link-local address formed from an interface
1466 * identifier based on the hardware address which is supposed to be
1467 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1468 * operation on the interface SHOULD be disabled.
1469 * [RFC 4862, Section 5.4.5]
1471 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1472 struct in6_addr in6;
1475 * To avoid over-reaction, we only apply this logic when we are
1476 * very sure that hardware addresses are supposed to be unique.
1478 switch (ifp->if_type) {
1482 case IFT_INFINIBAND:
1483 in6 = ia->ia_addr.sin6_addr;
1484 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1485 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1486 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1487 log(LOG_ERR, "%s: possible hardware address "
1488 "duplication detected, disable IPv6\n",
1497 nd6_dad_ns_output(struct dadq *dp)
1499 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1500 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1503 dp->dad_ns_tcount++;
1504 if ((ifp->if_flags & IFF_UP) == 0) {
1507 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1511 dp->dad_ns_ocount++;
1512 if (V_dad_enhanced != 0) {
1513 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1514 dp->dad_nonce[i] = arc4random();
1516 * XXXHRS: Note that in the case that
1517 * DupAddrDetectTransmits > 1, multiple NS messages with
1518 * different nonces can be looped back in an unexpected
1519 * order. The current implementation recognizes only
1520 * the latest nonce on the sender side. Practically it
1521 * should work well in almost all cases.
1524 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1525 (uint8_t *)&dp->dad_nonce[0]);
1529 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1534 panic("ifa == NULL in nd6_dad_ns_input");
1536 /* Ignore Nonce option when Enhanced DAD is disabled. */
1537 if (V_dad_enhanced == 0)
1539 dp = nd6_dad_find(ifa, ndopt_nonce);
1543 dp->dad_ns_icount++;
1548 nd6_dad_na_input(struct ifaddr *ifa)
1553 panic("ifa == NULL in nd6_dad_na_input");
1555 dp = nd6_dad_find(ifa, NULL);
1557 dp->dad_na_icount++;