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)
124 struct ifnet *ifp = m->m_pkthdr.rcvif;
125 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
126 struct nd_neighbor_solicit *nd_ns;
127 struct in6_addr saddr6 = ip6->ip6_src;
128 struct in6_addr daddr6 = ip6->ip6_dst;
129 struct in6_addr taddr6;
130 struct in6_addr myaddr6;
132 struct ifaddr *ifa = NULL;
134 int anycast = 0, proxy = 0, tentative = 0;
137 union nd_opts ndopts;
138 struct sockaddr_dl proxydl;
139 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
141 /* RFC 6980: Nodes MUST silently ignore fragments */
142 if(m->m_flags & M_FRAGMENTED)
145 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
146 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
148 #ifndef PULLDOWN_TEST
149 IP6_EXTHDR_CHECK(m, off, icmp6len,);
150 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
152 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
154 ICMP6STAT_INC(icp6s_tooshort);
158 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
159 taddr6 = nd_ns->nd_ns_target;
160 if (in6_setscope(&taddr6, ifp, NULL) != 0)
163 if (ip6->ip6_hlim != 255) {
165 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
166 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
167 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
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 */
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);
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) {
278 * proxy NDP for single entry
280 proxydl = *SDL(&rt_gateway);
281 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
282 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
290 * We've got an NS packet, and we don't have that adddress
291 * assigned for us. We MUST silently ignore it.
296 myaddr6 = *IFA_IN6(ifa);
297 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
298 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
299 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
302 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
303 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
304 "(if %d, NS packet %d)\n",
305 ip6_sprintf(ip6bufs, &taddr6),
306 ifp->if_addrlen, lladdrlen - 2));
310 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
311 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
312 ip6_sprintf(ip6bufs, &saddr6)));
317 * We have neighbor solicitation packet, with target address equals to
318 * one of my tentative address.
320 * src addr how to process?
322 * multicast of course, invalid (rejected in ip6_input)
323 * unicast somebody is doing address resolution -> ignore
324 * unspec dup address detection
326 * The processing is defined in RFC 2462.
330 * If source address is unspecified address, it is for
331 * duplicate address detection.
333 * If not, the packet is for addess resolution;
334 * silently ignore it.
336 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
337 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
343 * If the source address is unspecified address, entries must not
344 * be created or updated.
345 * It looks that sender is performing DAD. Output NA toward
346 * all-node multicast address, to tell the sender that I'm using
348 * S bit ("solicited") must be zero.
350 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
351 struct in6_addr in6_all;
353 in6_all = in6addr_linklocal_allnodes;
354 if (in6_setscope(&in6_all, ifp, NULL) != 0)
356 nd6_na_output_fib(ifp, &in6_all, &taddr6,
357 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
358 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
363 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
364 ND_NEIGHBOR_SOLICIT, 0);
366 nd6_na_output_fib(ifp, &saddr6, &taddr6,
367 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
368 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
369 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
377 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
378 ip6_sprintf(ip6bufs, &saddr6)));
379 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
380 ip6_sprintf(ip6bufs, &daddr6)));
381 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
382 ip6_sprintf(ip6bufs, &taddr6)));
383 ICMP6STAT_INC(icp6s_badns);
390 * Output a Neighbor Solicitation Message. Caller specifies:
391 * - ICMP6 header source IP6 address
392 * - ND6 header target IP6 address
393 * - ND6 header source datalink address
396 * Based on RFC 2462 (duplicate address detection)
398 * ln - for source address determination
399 * nonce - If non-NULL, NS is used for duplicate address detection and
400 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
403 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
404 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
405 uint8_t *nonce, u_int fibnum)
410 struct nd_neighbor_solicit *nd_ns;
411 struct ip6_moptions im6o;
416 if (IN6_IS_ADDR_MULTICAST(taddr6))
419 /* estimate the size of message */
420 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
421 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
422 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
423 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
424 __func__, max_linkhdr, maxlen, MCLBYTES));
426 if (max_linkhdr + maxlen > MHLEN)
427 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
429 m = m_gethdr(M_NOWAIT, MT_DATA);
434 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
435 m->m_flags |= M_MCAST;
436 im6o.im6o_multicast_ifp = ifp;
437 im6o.im6o_multicast_hlim = 255;
438 im6o.im6o_multicast_loop = 0;
441 icmp6len = sizeof(*nd_ns);
442 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
443 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
445 /* fill neighbor solicitation packet */
446 ip6 = mtod(m, struct ip6_hdr *);
448 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
449 ip6->ip6_vfc |= IPV6_VERSION;
450 /* ip6->ip6_plen will be set later */
451 ip6->ip6_nxt = IPPROTO_ICMPV6;
454 ip6->ip6_dst = *daddr6;
456 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
457 ip6->ip6_dst.s6_addr16[1] = 0;
458 ip6->ip6_dst.s6_addr32[1] = 0;
459 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
460 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
461 ip6->ip6_dst.s6_addr8[12] = 0xff;
462 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
466 struct ifaddr *ifa = NULL;
470 * "If the source address of the packet prompting the
471 * solicitation is the same as one of the addresses assigned
472 * to the outgoing interface, that address SHOULD be placed
473 * in the IP Source Address of the outgoing solicitation.
474 * Otherwise, any one of the addresses assigned to the
475 * interface should be used."
477 * We use the source address for the prompting packet
478 * (saddr6), if saddr6 belongs to the outgoing interface.
479 * Otherwise, we perform the source address selection as usual.
483 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
485 /* ip6_src set already. */
486 ip6->ip6_src = *saddr6;
490 struct in6_addr dst6, src6;
493 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
494 error = in6_selectsrc_addr(fibnum, &dst6,
495 scopeid, ifp, &src6, NULL);
497 char ip6buf[INET6_ADDRSTRLEN];
498 nd6log((LOG_DEBUG, "%s: source can't be "
499 "determined: dst=%s, error=%d\n", __func__,
500 ip6_sprintf(ip6buf, &dst6),
508 * Source address for DAD packet must always be IPv6
509 * unspecified address. (0::0)
510 * We actually don't have to 0-clear the address (we did it
511 * above), but we do so here explicitly to make the intention
514 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
516 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
517 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
518 nd_ns->nd_ns_code = 0;
519 nd_ns->nd_ns_reserved = 0;
520 nd_ns->nd_ns_target = *taddr6;
521 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
524 * Add source link-layer address option.
526 * spec implementation
528 * DAD packet MUST NOT do not add the option
529 * there's no link layer address:
530 * impossible do not add the option
531 * there's link layer address:
532 * Multicast NS MUST add one add the option
533 * Unicast NS SHOULD add one add the option
535 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
536 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
537 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
538 /* 8 byte alignments... */
539 optlen = (optlen + 7) & ~7;
541 m->m_pkthdr.len += optlen;
544 bzero((caddr_t)nd_opt, optlen);
545 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
546 nd_opt->nd_opt_len = optlen >> 3;
547 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
550 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
551 * This behavior is documented as Enhanced Duplicate Address
552 * Detection in RFC 7527.
553 * net.inet6.ip6.dad_enhanced=0 disables this.
555 if (V_dad_enhanced != 0 && nonce != NULL) {
556 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
557 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
558 /* 8-byte alignment is required. */
559 optlen = (optlen + 7) & ~7;
561 m->m_pkthdr.len += optlen;
564 bzero((caddr_t)nd_opt, optlen);
565 nd_opt->nd_opt_type = ND_OPT_NONCE;
566 nd_opt->nd_opt_len = optlen >> 3;
567 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
569 ip6->ip6_plen = htons((u_short)icmp6len);
570 nd_ns->nd_ns_cksum = 0;
572 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
574 if (send_sendso_input_hook != NULL) {
575 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
576 sizeof(unsigned short), M_NOWAIT);
579 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
580 m_tag_prepend(m, mtag);
583 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
585 icmp6_ifstat_inc(ifp, ifs6_out_msg);
586 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
587 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
597 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
598 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
601 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
605 * Neighbor advertisement input handling.
608 * Based on RFC 2462 (duplicate address detection)
610 * the following items are not implemented yet:
611 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
612 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
615 nd6_na_input(struct mbuf *m, int off, int icmp6len)
617 struct ifnet *ifp = m->m_pkthdr.rcvif;
618 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
619 struct nd_neighbor_advert *nd_na;
620 struct in6_addr daddr6 = ip6->ip6_dst;
621 struct in6_addr taddr6;
630 struct llentry *ln = NULL;
631 union nd_opts ndopts;
632 struct mbuf *chain = NULL;
633 struct sockaddr_in6 sin6;
634 u_char linkhdr[LLE_MAX_LINKHDR];
637 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
641 /* RFC 6980: Nodes MUST silently ignore fragments */
642 if(m->m_flags & M_FRAGMENTED)
645 if (ip6->ip6_hlim != 255) {
647 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
648 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
649 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
653 #ifndef PULLDOWN_TEST
654 IP6_EXTHDR_CHECK(m, off, icmp6len,);
655 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
657 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
659 ICMP6STAT_INC(icp6s_tooshort);
664 flags = nd_na->nd_na_flags_reserved;
665 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
666 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
667 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
668 memset(&sin6, 0, sizeof(sin6));
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)));
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 */
696 if (ndopts.nd_opts_tgt_lladdr) {
697 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
698 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
702 * This effectively disables the DAD check on a non-master CARP
706 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
708 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
711 * Target address matches one of my interface address.
713 * If my address is tentative, this means that there's somebody
714 * already using the same address as mine. This indicates DAD failure.
715 * This is defined in RFC 2462.
717 * Otherwise, process as defined in RFC 2461.
720 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
721 nd6_dad_na_input(ifa);
726 /* Just for safety, maybe unnecessary. */
730 "nd6_na_input: duplicate IP6 address %s\n",
731 ip6_sprintf(ip6bufs, &taddr6));
735 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
736 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
737 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
738 ifp->if_addrlen, lladdrlen - 2));
743 * If no neighbor cache entry is found, NA SHOULD silently be
746 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
751 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
753 * If the link-layer has address, and no lladdr option came,
754 * discard the packet.
756 if (ifp->if_addrlen && lladdr == NULL) {
761 * Record link-layer address, and update the state.
763 linkhdrsize = sizeof(linkhdr);
764 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
765 linkhdr, &linkhdrsize, &lladdr_off) != 0)
768 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
773 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
775 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
777 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
778 if ((ln->ln_router = is_router) != 0) {
780 * This means a router's state has changed from
781 * non-reachable to probably reachable, and might
782 * affect the status of associated prefixes..
790 * Check if the link-layer address has changed or not.
795 if (ln->la_flags & LLE_VALID) {
796 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
805 * This is VERY complex. Look at it with care.
807 * override solicit lladdr llchange action
812 * 0 0 y y (1) REACHABLE->STALE
813 * 0 1 n -- (2c) *->REACHABLE
814 * 0 1 y n (2b) L *->REACHABLE
815 * 0 1 y y (1) REACHABLE->STALE
818 * 1 0 y y (2a) L *->STALE
819 * 1 1 n -- (2a) *->REACHABLE
820 * 1 1 y n (2a) L *->REACHABLE
821 * 1 1 y y (2a) L *->REACHABLE
823 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
825 * If state is REACHABLE, make it STALE.
826 * no other updates should be done.
828 if (ln->ln_state == ND6_LLINFO_REACHABLE)
829 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
831 } else if (is_override /* (2a) */
832 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
833 || lladdr == NULL) { /* (2c) */
835 * Update link-local address, if any.
837 if (lladdr != NULL) {
838 linkhdrsize = sizeof(linkhdr);
839 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
840 linkhdr, &linkhdrsize, &lladdr_off) != 0)
842 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
843 linkhdrsize, lladdr_off) == 0) {
847 EVENTHANDLER_INVOKE(lle_event, ln,
852 * If solicited, make the state REACHABLE.
853 * If not solicited and the link-layer address was
854 * changed, make it STALE.
857 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
859 if (lladdr != NULL && llchange)
860 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
864 if (ln->ln_router && !is_router) {
866 * The peer dropped the router flag.
867 * Remove the sender from the Default Router List and
868 * update the Destination Cache entries.
870 struct ifnet *nd6_ifp;
872 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
873 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
874 (ND_IFINFO(nd6_ifp)->flags &
875 ND6_IFF_ACCEPT_RTADV) != 0)
877 * Even if the neighbor is not in the default
878 * router list, the neighbor may be used as a
879 * next hop for some destinations (e.g. redirect
880 * case). So we must call rt6_flush explicitly.
882 rt6_flush(&ip6->ip6_src, ifp);
884 ln->ln_router = is_router;
888 * rt->rt_flags &= ~RTF_REJECT;
891 if (ln->la_hold != NULL)
892 nd6_grab_holdchain(ln, &chain, &sin6);
898 nd6_flush_holdchain(ifp, chain, &sin6);
901 pfxlist_onlink_check();
910 ICMP6STAT_INC(icp6s_badna);
915 * Neighbor advertisement output handling.
919 * the following items are not implemented yet:
920 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
921 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
923 * tlladdr - 1 if include target link-layer address
924 * sdl0 - sockaddr_dl (= proxy NA) or NULL
927 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
928 const struct in6_addr *taddr6, u_long flags, int tlladdr,
929 struct sockaddr *sdl0, u_int fibnum)
934 struct nd_neighbor_advert *nd_na;
935 struct ip6_moptions im6o;
936 struct in6_addr daddr6, dst6, src6;
939 int icmp6len, maxlen, error;
942 daddr6 = *daddr6_0; /* make a local copy for modification */
944 /* estimate the size of message */
945 maxlen = sizeof(*ip6) + sizeof(*nd_na);
946 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
947 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
948 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
949 __func__, max_linkhdr, maxlen, MCLBYTES));
951 if (max_linkhdr + maxlen > MHLEN)
952 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
954 m = m_gethdr(M_NOWAIT, MT_DATA);
959 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
960 m->m_flags |= M_MCAST;
961 im6o.im6o_multicast_ifp = ifp;
962 im6o.im6o_multicast_hlim = 255;
963 im6o.im6o_multicast_loop = 0;
966 icmp6len = sizeof(*nd_na);
967 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
968 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
970 /* fill neighbor advertisement packet */
971 ip6 = mtod(m, struct ip6_hdr *);
973 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
974 ip6->ip6_vfc |= IPV6_VERSION;
975 ip6->ip6_nxt = IPPROTO_ICMPV6;
977 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
979 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
980 daddr6.s6_addr16[1] = 0;
981 daddr6.s6_addr32[1] = 0;
982 daddr6.s6_addr32[2] = 0;
983 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
984 if (in6_setscope(&daddr6, ifp, NULL))
987 flags &= ~ND_NA_FLAG_SOLICITED;
989 ip6->ip6_dst = daddr6;
992 * Select a source whose scope is the same as that of the dest.
994 in6_splitscope(&daddr6, &dst6, &scopeid);
995 error = in6_selectsrc_addr(fibnum, &dst6,
996 scopeid, ifp, &src6, NULL);
998 char ip6buf[INET6_ADDRSTRLEN];
999 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1000 "determined: dst=%s, error=%d\n",
1001 ip6_sprintf(ip6buf, &daddr6), error));
1004 ip6->ip6_src = src6;
1005 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1006 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1007 nd_na->nd_na_code = 0;
1008 nd_na->nd_na_target = *taddr6;
1009 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1012 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1013 * see nd6_ns_input() for details.
1014 * Basically, if NS packet is sent to unicast/anycast addr,
1015 * target lladdr option SHOULD NOT be included.
1019 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1020 * lladdr in sdl0. If we are not proxying (sending NA for
1021 * my address) use lladdr configured for the interface.
1025 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1027 mac = nd6_ifptomac(ifp);
1028 } else if (sdl0->sa_family == AF_LINK) {
1029 struct sockaddr_dl *sdl;
1030 sdl = (struct sockaddr_dl *)sdl0;
1031 if (sdl->sdl_alen == ifp->if_addrlen)
1035 if (tlladdr && mac) {
1036 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1037 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1039 /* roundup to 8 bytes alignment! */
1040 optlen = (optlen + 7) & ~7;
1042 m->m_pkthdr.len += optlen;
1045 bzero((caddr_t)nd_opt, optlen);
1046 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1047 nd_opt->nd_opt_len = optlen >> 3;
1048 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1050 flags &= ~ND_NA_FLAG_OVERRIDE;
1052 ip6->ip6_plen = htons((u_short)icmp6len);
1053 nd_na->nd_na_flags_reserved = flags;
1054 nd_na->nd_na_cksum = 0;
1055 nd_na->nd_na_cksum =
1056 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1058 if (send_sendso_input_hook != NULL) {
1059 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1060 sizeof(unsigned short), M_NOWAIT);
1063 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1064 m_tag_prepend(m, mtag);
1067 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1068 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1069 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1070 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1078 #ifndef BURN_BRIDGES
1080 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1081 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1082 struct sockaddr *sdl0)
1085 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1091 nd6_ifptomac(struct ifnet *ifp)
1093 switch (ifp->if_type) {
1097 case IFT_INFINIBAND:
1099 return IF_LLADDR(ifp);
1106 TAILQ_ENTRY(dadq) dad_list;
1107 struct ifaddr *dad_ifa;
1108 int dad_count; /* max NS to send */
1109 int dad_ns_tcount; /* # of trials to send NS */
1110 int dad_ns_ocount; /* NS sent so far */
1113 int dad_ns_lcount; /* looped back NS */
1114 int dad_loopbackprobe; /* probing state for loopback detection */
1115 struct callout dad_timer_ch;
1116 struct vnet *dad_vnet;
1118 #define ND_OPT_NONCE_LEN32 \
1119 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1120 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1121 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1124 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1125 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1126 #define V_dadq VNET(dadq)
1127 #define V_dad_rwlock VNET(dad_rwlock)
1129 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1130 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1131 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1132 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1135 nd6_dad_add(struct dadq *dp)
1139 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1140 dp->dad_ondadq = true;
1145 nd6_dad_del(struct dadq *dp)
1149 if (dp->dad_ondadq) {
1151 * Remove dp from the dadq and release the dadq's
1154 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1155 dp->dad_ondadq = false;
1162 static struct dadq *
1163 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1168 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1169 if (dp->dad_ifa != ifa)
1172 * Skip if the nonce matches the received one.
1173 * +2 in the length is required because of type and
1174 * length fields are included in a header.
1177 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1178 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1179 ND_OPT_NONCE_LEN) == 0) {
1180 dp->dad_ns_lcount++;
1183 refcount_acquire(&dp->dad_refcnt);
1192 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1196 struct epoch_tracker et;
1198 NET_EPOCH_ENTER(et);
1199 nd6_dad_ns_output(dp);
1202 callout_reset(&dp->dad_timer_ch, ticks,
1203 (void (*)(void *))nd6_dad_timer, (void *)dp);
1207 nd6_dad_stoptimer(struct dadq *dp)
1210 callout_drain(&dp->dad_timer_ch);
1214 nd6_dad_rele(struct dadq *dp)
1217 if (refcount_release(&dp->dad_refcnt)) {
1218 ifa_free(dp->dad_ifa);
1227 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1228 TAILQ_INIT(&V_dadq);
1232 * Start Duplicate Address Detection (DAD) for specified interface address.
1235 nd6_dad_start(struct ifaddr *ifa, int delay)
1237 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1239 char ip6buf[INET6_ADDRSTRLEN];
1241 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1242 ("starting DAD on non-tentative address %p", ifa));
1245 * If we don't need DAD, don't do it.
1246 * There are several cases:
1247 * - DAD is disabled globally or on the interface
1248 * - the interface address is anycast
1250 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1251 V_ip6_dad_count == 0 ||
1252 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1253 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1256 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1257 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1258 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1261 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1263 * DAD is already in progress. Let the existing entry
1270 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1272 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1274 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1275 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1278 callout_init(&dp->dad_timer_ch, 0);
1280 dp->dad_vnet = curvnet;
1282 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1283 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1286 * Send NS packet for DAD, ip6_dad_count times.
1287 * Note that we must delay the first transmission, if this is the
1288 * first packet to be sent from the interface after interface
1289 * (re)initialization.
1292 ifa_ref(dp->dad_ifa);
1293 dp->dad_count = V_ip6_dad_count;
1294 dp->dad_ns_icount = dp->dad_na_icount = 0;
1295 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1296 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1298 /* Add this to the dadq and add a reference for the dadq. */
1299 refcount_init(&dp->dad_refcnt, 1);
1301 nd6_dad_starttimer(dp, delay, 0);
1305 * terminate DAD unconditionally. used for address removals.
1308 nd6_dad_stop(struct ifaddr *ifa)
1312 dp = nd6_dad_find(ifa, NULL);
1314 /* DAD wasn't started yet */
1318 nd6_dad_stoptimer(dp);
1321 /* Release this function's reference, acquired by nd6_dad_find(). */
1326 nd6_dad_timer(struct dadq *dp)
1328 CURVNET_SET(dp->dad_vnet);
1329 struct ifaddr *ifa = dp->dad_ifa;
1330 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1331 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1332 char ip6buf[INET6_ADDRSTRLEN];
1334 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1336 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1337 /* Do not need DAD for ifdisabled interface. */
1338 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1339 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1342 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1343 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1345 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1346 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1349 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1350 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1352 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1353 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1357 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1358 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1359 (((ifp->if_flags & IFF_UP) == 0) ||
1360 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1361 nd6log((LOG_INFO, "%s: could not run DAD "
1362 "because the interface was down or not running.\n",
1363 if_name(ifa->ifa_ifp)));
1367 /* Need more checks? */
1368 if (dp->dad_ns_ocount < dp->dad_count) {
1370 * We have more NS to go. Send NS packet for DAD.
1372 nd6_dad_starttimer(dp,
1373 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1377 * We have transmitted sufficient number of DAD packets.
1378 * See what we've got.
1380 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1381 /* We've seen NS or NA, means DAD has failed. */
1382 nd6_dad_duplicated(ifa, dp);
1383 else if (V_dad_enhanced != 0 &&
1384 dp->dad_ns_lcount > 0 &&
1385 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1387 * Sec. 4.1 in RFC 7527 requires transmission of
1388 * additional probes until the loopback condition
1389 * becomes clear when a looped back probe is detected.
1391 log(LOG_ERR, "%s: a looped back NS message is "
1392 "detected during DAD for %s. "
1393 "Another DAD probes are being sent.\n",
1394 if_name(ifa->ifa_ifp),
1395 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1396 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1398 * Send an NS immediately and increase dad_count by
1399 * V_nd6_mmaxtries - 1.
1402 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1403 nd6_dad_starttimer(dp,
1404 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1409 * We are done with DAD. No NA came, no NS came.
1410 * No duplicate address found. Check IFDISABLED flag
1411 * again in case that it is changed between the
1412 * beginning of this function and here.
1414 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1415 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1418 "%s: DAD complete for %s - no duplicates found\n",
1419 if_name(ifa->ifa_ifp),
1420 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1421 if (dp->dad_ns_lcount > 0)
1422 log(LOG_ERR, "%s: DAD completed while "
1423 "a looped back NS message is detected "
1424 "during DAD for %s.\n",
1425 if_name(ifa->ifa_ifp),
1426 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1436 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1438 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1440 char ip6buf[INET6_ADDRSTRLEN];
1442 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1443 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1444 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1445 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1448 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1449 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1452 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1453 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1454 log(LOG_ERR, "%s: manual intervention required\n",
1458 * If the address is a link-local address formed from an interface
1459 * identifier based on the hardware address which is supposed to be
1460 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1461 * operation on the interface SHOULD be disabled.
1462 * [RFC 4862, Section 5.4.5]
1464 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1465 struct in6_addr in6;
1468 * To avoid over-reaction, we only apply this logic when we are
1469 * very sure that hardware addresses are supposed to be unique.
1471 switch (ifp->if_type) {
1475 case IFT_INFINIBAND:
1476 in6 = ia->ia_addr.sin6_addr;
1477 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1478 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1479 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1480 log(LOG_ERR, "%s: possible hardware address "
1481 "duplication detected, disable IPv6\n",
1490 nd6_dad_ns_output(struct dadq *dp)
1492 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1493 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1496 dp->dad_ns_tcount++;
1497 if ((ifp->if_flags & IFF_UP) == 0) {
1500 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1504 dp->dad_ns_ocount++;
1505 if (V_dad_enhanced != 0) {
1506 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1507 dp->dad_nonce[i] = arc4random();
1509 * XXXHRS: Note that in the case that
1510 * DupAddrDetectTransmits > 1, multiple NS messages with
1511 * different nonces can be looped back in an unexpected
1512 * order. The current implementation recognizes only
1513 * the latest nonce on the sender side. Practically it
1514 * should work well in almost all cases.
1517 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1518 (uint8_t *)&dp->dad_nonce[0]);
1522 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1527 panic("ifa == NULL in nd6_dad_ns_input");
1529 /* Ignore Nonce option when Enhanced DAD is disabled. */
1530 if (V_dad_enhanced == 0)
1532 dp = nd6_dad_find(ifa, ndopt_nonce);
1536 dp->dad_ns_icount++;
1541 nd6_dad_na_input(struct ifaddr *ifa)
1546 panic("ifa == NULL in nd6_dad_na_input");
1548 dp = nd6_dad_find(ifa, NULL);
1550 dp->dad_na_icount++;