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 epoch_tracker et;
618 struct ifnet *ifp = m->m_pkthdr.rcvif;
619 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
620 struct nd_neighbor_advert *nd_na;
621 struct in6_addr daddr6 = ip6->ip6_dst;
622 struct in6_addr taddr6;
631 struct llentry *ln = NULL;
632 union nd_opts ndopts;
633 struct mbuf *chain = NULL;
634 struct sockaddr_in6 sin6;
635 u_char linkhdr[LLE_MAX_LINKHDR];
638 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
640 /* RFC 6980: Nodes MUST silently ignore fragments */
641 if(m->m_flags & M_FRAGMENTED)
644 if (ip6->ip6_hlim != 255) {
646 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
647 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
648 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
652 #ifndef PULLDOWN_TEST
653 IP6_EXTHDR_CHECK(m, off, icmp6len,);
654 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
656 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
658 ICMP6STAT_INC(icp6s_tooshort);
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);
667 memset(&sin6, 0, sizeof(sin6));
669 taddr6 = nd_na->nd_na_target;
670 if (in6_setscope(&taddr6, ifp, NULL))
671 goto bad; /* XXX: impossible */
673 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
675 "nd6_na_input: invalid target address %s\n",
676 ip6_sprintf(ip6bufs, &taddr6)));
679 if (IN6_IS_ADDR_MULTICAST(&daddr6))
682 "nd6_na_input: a solicited adv is multicasted\n"));
686 icmp6len -= sizeof(*nd_na);
687 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
688 if (nd6_options(&ndopts) < 0) {
690 "nd6_na_input: invalid ND option, ignored\n"));
691 /* nd6_options have incremented stats */
695 if (ndopts.nd_opts_tgt_lladdr) {
696 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
697 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
701 * This effectively disables the DAD check on a non-master CARP
705 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
707 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
710 * Target address matches one of my interface address.
712 * If my address is tentative, this means that there's somebody
713 * already using the same address as mine. This indicates DAD failure.
714 * This is defined in RFC 2462.
716 * Otherwise, process as defined in RFC 2461.
719 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
720 nd6_dad_na_input(ifa);
725 /* Just for safety, maybe unnecessary. */
729 "nd6_na_input: duplicate IP6 address %s\n",
730 ip6_sprintf(ip6bufs, &taddr6));
734 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
735 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
736 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
737 ifp->if_addrlen, lladdrlen - 2));
742 * If no neighbor cache entry is found, NA SHOULD silently be
746 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
752 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
754 * If the link-layer has address, and no lladdr option came,
755 * discard the packet.
757 if (ifp->if_addrlen && lladdr == NULL) {
762 * Record link-layer address, and update the state.
764 linkhdrsize = sizeof(linkhdr);
765 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
766 linkhdr, &linkhdrsize, &lladdr_off) != 0)
769 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
774 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
776 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
778 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
779 if ((ln->ln_router = is_router) != 0) {
781 * This means a router's state has changed from
782 * non-reachable to probably reachable, and might
783 * affect the status of associated prefixes..
791 * Check if the link-layer address has changed or not.
796 if (ln->la_flags & LLE_VALID) {
797 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
806 * This is VERY complex. Look at it with care.
808 * override solicit lladdr llchange action
813 * 0 0 y y (1) REACHABLE->STALE
814 * 0 1 n -- (2c) *->REACHABLE
815 * 0 1 y n (2b) L *->REACHABLE
816 * 0 1 y y (1) REACHABLE->STALE
819 * 1 0 y y (2a) L *->STALE
820 * 1 1 n -- (2a) *->REACHABLE
821 * 1 1 y n (2a) L *->REACHABLE
822 * 1 1 y y (2a) L *->REACHABLE
824 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
826 * If state is REACHABLE, make it STALE.
827 * no other updates should be done.
829 if (ln->ln_state == ND6_LLINFO_REACHABLE)
830 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
832 } else if (is_override /* (2a) */
833 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
834 || lladdr == NULL) { /* (2c) */
836 * Update link-local address, if any.
838 if (lladdr != NULL) {
839 linkhdrsize = sizeof(linkhdr);
840 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
841 linkhdr, &linkhdrsize, &lladdr_off) != 0)
843 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
844 linkhdrsize, lladdr_off) == 0) {
848 EVENTHANDLER_INVOKE(lle_event, ln,
853 * If solicited, make the state REACHABLE.
854 * If not solicited and the link-layer address was
855 * changed, make it STALE.
858 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
860 if (lladdr != NULL && llchange)
861 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
865 if (ln->ln_router && !is_router) {
867 * The peer dropped the router flag.
868 * Remove the sender from the Default Router List and
869 * update the Destination Cache entries.
871 struct ifnet *nd6_ifp;
873 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
874 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
875 (ND_IFINFO(nd6_ifp)->flags &
876 ND6_IFF_ACCEPT_RTADV) != 0)
878 * Even if the neighbor is not in the default
879 * router list, the neighbor may be used as a
880 * next hop for some destinations (e.g. redirect
881 * case). So we must call rt6_flush explicitly.
883 rt6_flush(&ip6->ip6_src, ifp);
885 ln->ln_router = is_router;
889 * rt->rt_flags &= ~RTF_REJECT;
892 if (ln->la_hold != NULL)
893 nd6_grab_holdchain(ln, &chain, &sin6);
899 nd6_flush_holdchain(ifp, chain, &sin6);
902 pfxlist_onlink_check();
911 ICMP6STAT_INC(icp6s_badna);
916 * Neighbor advertisement output handling.
920 * the following items are not implemented yet:
921 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
922 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
924 * tlladdr - 1 if include target link-layer address
925 * sdl0 - sockaddr_dl (= proxy NA) or NULL
928 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
929 const struct in6_addr *taddr6, u_long flags, int tlladdr,
930 struct sockaddr *sdl0, u_int fibnum)
935 struct nd_neighbor_advert *nd_na;
936 struct ip6_moptions im6o;
937 struct in6_addr daddr6, dst6, src6;
940 int icmp6len, maxlen, error;
943 daddr6 = *daddr6_0; /* make a local copy for modification */
945 /* estimate the size of message */
946 maxlen = sizeof(*ip6) + sizeof(*nd_na);
947 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
948 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
949 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
950 __func__, max_linkhdr, maxlen, MCLBYTES));
952 if (max_linkhdr + maxlen > MHLEN)
953 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
955 m = m_gethdr(M_NOWAIT, MT_DATA);
960 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
961 m->m_flags |= M_MCAST;
962 im6o.im6o_multicast_ifp = ifp;
963 im6o.im6o_multicast_hlim = 255;
964 im6o.im6o_multicast_loop = 0;
967 icmp6len = sizeof(*nd_na);
968 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
969 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
971 /* fill neighbor advertisement packet */
972 ip6 = mtod(m, struct ip6_hdr *);
974 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
975 ip6->ip6_vfc |= IPV6_VERSION;
976 ip6->ip6_nxt = IPPROTO_ICMPV6;
978 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
980 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
981 daddr6.s6_addr16[1] = 0;
982 daddr6.s6_addr32[1] = 0;
983 daddr6.s6_addr32[2] = 0;
984 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
985 if (in6_setscope(&daddr6, ifp, NULL))
988 flags &= ~ND_NA_FLAG_SOLICITED;
990 ip6->ip6_dst = daddr6;
993 * Select a source whose scope is the same as that of the dest.
995 in6_splitscope(&daddr6, &dst6, &scopeid);
996 error = in6_selectsrc_addr(fibnum, &dst6,
997 scopeid, ifp, &src6, NULL);
999 char ip6buf[INET6_ADDRSTRLEN];
1000 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1001 "determined: dst=%s, error=%d\n",
1002 ip6_sprintf(ip6buf, &daddr6), error));
1005 ip6->ip6_src = src6;
1006 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1007 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1008 nd_na->nd_na_code = 0;
1009 nd_na->nd_na_target = *taddr6;
1010 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1013 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1014 * see nd6_ns_input() for details.
1015 * Basically, if NS packet is sent to unicast/anycast addr,
1016 * target lladdr option SHOULD NOT be included.
1020 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1021 * lladdr in sdl0. If we are not proxying (sending NA for
1022 * my address) use lladdr configured for the interface.
1026 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1028 mac = nd6_ifptomac(ifp);
1029 } else if (sdl0->sa_family == AF_LINK) {
1030 struct sockaddr_dl *sdl;
1031 sdl = (struct sockaddr_dl *)sdl0;
1032 if (sdl->sdl_alen == ifp->if_addrlen)
1036 if (tlladdr && mac) {
1037 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1038 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1040 /* roundup to 8 bytes alignment! */
1041 optlen = (optlen + 7) & ~7;
1043 m->m_pkthdr.len += optlen;
1046 bzero((caddr_t)nd_opt, optlen);
1047 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1048 nd_opt->nd_opt_len = optlen >> 3;
1049 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1051 flags &= ~ND_NA_FLAG_OVERRIDE;
1053 ip6->ip6_plen = htons((u_short)icmp6len);
1054 nd_na->nd_na_flags_reserved = flags;
1055 nd_na->nd_na_cksum = 0;
1056 nd_na->nd_na_cksum =
1057 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1059 if (send_sendso_input_hook != NULL) {
1060 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1061 sizeof(unsigned short), M_NOWAIT);
1064 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1065 m_tag_prepend(m, mtag);
1068 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1069 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1070 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1071 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1079 #ifndef BURN_BRIDGES
1081 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1082 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1083 struct sockaddr *sdl0)
1086 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1092 nd6_ifptomac(struct ifnet *ifp)
1094 switch (ifp->if_type) {
1098 case IFT_INFINIBAND:
1100 return IF_LLADDR(ifp);
1107 TAILQ_ENTRY(dadq) dad_list;
1108 struct ifaddr *dad_ifa;
1109 int dad_count; /* max NS to send */
1110 int dad_ns_tcount; /* # of trials to send NS */
1111 int dad_ns_ocount; /* NS sent so far */
1114 int dad_ns_lcount; /* looped back NS */
1115 int dad_loopbackprobe; /* probing state for loopback detection */
1116 struct callout dad_timer_ch;
1117 struct vnet *dad_vnet;
1119 #define ND_OPT_NONCE_LEN32 \
1120 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1121 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1122 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1125 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1126 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1127 #define V_dadq VNET(dadq)
1128 #define V_dad_rwlock VNET(dad_rwlock)
1130 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1131 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1132 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1133 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1136 nd6_dad_add(struct dadq *dp)
1140 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1141 dp->dad_ondadq = true;
1146 nd6_dad_del(struct dadq *dp)
1150 if (dp->dad_ondadq) {
1152 * Remove dp from the dadq and release the dadq's
1155 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1156 dp->dad_ondadq = false;
1163 static struct dadq *
1164 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1169 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1170 if (dp->dad_ifa != ifa)
1173 * Skip if the nonce matches the received one.
1174 * +2 in the length is required because of type and
1175 * length fields are included in a header.
1178 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1179 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1180 ND_OPT_NONCE_LEN) == 0) {
1181 dp->dad_ns_lcount++;
1184 refcount_acquire(&dp->dad_refcnt);
1193 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1197 nd6_dad_ns_output(dp);
1198 callout_reset(&dp->dad_timer_ch, ticks,
1199 (void (*)(void *))nd6_dad_timer, (void *)dp);
1203 nd6_dad_stoptimer(struct dadq *dp)
1206 callout_drain(&dp->dad_timer_ch);
1210 nd6_dad_rele(struct dadq *dp)
1213 if (refcount_release(&dp->dad_refcnt)) {
1214 ifa_free(dp->dad_ifa);
1223 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1224 TAILQ_INIT(&V_dadq);
1228 * Start Duplicate Address Detection (DAD) for specified interface address.
1231 nd6_dad_start(struct ifaddr *ifa, int delay)
1233 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1235 char ip6buf[INET6_ADDRSTRLEN];
1237 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1238 ("starting DAD on non-tentative address %p", ifa));
1241 * If we don't need DAD, don't do it.
1242 * There are several cases:
1243 * - DAD is disabled globally or on the interface
1244 * - the interface address is anycast
1246 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1247 V_ip6_dad_count == 0 ||
1248 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1249 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1252 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1253 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1254 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1257 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1259 * DAD is already in progress. Let the existing entry
1266 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1268 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1270 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1271 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1274 callout_init(&dp->dad_timer_ch, 0);
1276 dp->dad_vnet = curvnet;
1278 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1279 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1282 * Send NS packet for DAD, ip6_dad_count times.
1283 * Note that we must delay the first transmission, if this is the
1284 * first packet to be sent from the interface after interface
1285 * (re)initialization.
1288 ifa_ref(dp->dad_ifa);
1289 dp->dad_count = V_ip6_dad_count;
1290 dp->dad_ns_icount = dp->dad_na_icount = 0;
1291 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1292 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1294 /* Add this to the dadq and add a reference for the dadq. */
1295 refcount_init(&dp->dad_refcnt, 1);
1297 nd6_dad_starttimer(dp, delay, 0);
1301 * terminate DAD unconditionally. used for address removals.
1304 nd6_dad_stop(struct ifaddr *ifa)
1308 dp = nd6_dad_find(ifa, NULL);
1310 /* DAD wasn't started yet */
1314 nd6_dad_stoptimer(dp);
1317 /* Release this function's reference, acquired by nd6_dad_find(). */
1322 nd6_dad_timer(struct dadq *dp)
1324 CURVNET_SET(dp->dad_vnet);
1325 struct ifaddr *ifa = dp->dad_ifa;
1326 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1327 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1328 char ip6buf[INET6_ADDRSTRLEN];
1330 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1332 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1333 /* Do not need DAD for ifdisabled interface. */
1334 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1335 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1338 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1339 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1341 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1342 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1345 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1346 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1348 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1349 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1353 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1354 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1355 (((ifp->if_flags & IFF_UP) == 0) ||
1356 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1357 nd6log((LOG_INFO, "%s: could not run DAD "
1358 "because the interface was down or not running.\n",
1359 if_name(ifa->ifa_ifp)));
1363 /* Need more checks? */
1364 if (dp->dad_ns_ocount < dp->dad_count) {
1366 * We have more NS to go. Send NS packet for DAD.
1368 nd6_dad_starttimer(dp,
1369 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1373 * We have transmitted sufficient number of DAD packets.
1374 * See what we've got.
1376 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1377 /* We've seen NS or NA, means DAD has failed. */
1378 nd6_dad_duplicated(ifa, dp);
1379 else if (V_dad_enhanced != 0 &&
1380 dp->dad_ns_lcount > 0 &&
1381 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1383 * Sec. 4.1 in RFC 7527 requires transmission of
1384 * additional probes until the loopback condition
1385 * becomes clear when a looped back probe is detected.
1387 log(LOG_ERR, "%s: a looped back NS message is "
1388 "detected during DAD for %s. "
1389 "Another DAD probes are being sent.\n",
1390 if_name(ifa->ifa_ifp),
1391 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1392 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1394 * Send an NS immediately and increase dad_count by
1395 * V_nd6_mmaxtries - 1.
1398 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1399 nd6_dad_starttimer(dp,
1400 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1405 * We are done with DAD. No NA came, no NS came.
1406 * No duplicate address found. Check IFDISABLED flag
1407 * again in case that it is changed between the
1408 * beginning of this function and here.
1410 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1411 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1414 "%s: DAD complete for %s - no duplicates found\n",
1415 if_name(ifa->ifa_ifp),
1416 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1417 if (dp->dad_ns_lcount > 0)
1418 log(LOG_ERR, "%s: DAD completed while "
1419 "a looped back NS message is detected "
1420 "during DAD for %s.\n",
1421 if_name(ifa->ifa_ifp),
1422 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1432 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1434 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1436 char ip6buf[INET6_ADDRSTRLEN];
1438 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1439 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1440 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1441 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1444 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1445 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1448 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1449 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1450 log(LOG_ERR, "%s: manual intervention required\n",
1454 * If the address is a link-local address formed from an interface
1455 * identifier based on the hardware address which is supposed to be
1456 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1457 * operation on the interface SHOULD be disabled.
1458 * [RFC 4862, Section 5.4.5]
1460 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1461 struct in6_addr in6;
1464 * To avoid over-reaction, we only apply this logic when we are
1465 * very sure that hardware addresses are supposed to be unique.
1467 switch (ifp->if_type) {
1471 case IFT_INFINIBAND:
1472 in6 = ia->ia_addr.sin6_addr;
1473 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1474 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1475 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1476 log(LOG_ERR, "%s: possible hardware address "
1477 "duplication detected, disable IPv6\n",
1486 nd6_dad_ns_output(struct dadq *dp)
1488 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1489 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1492 dp->dad_ns_tcount++;
1493 if ((ifp->if_flags & IFF_UP) == 0) {
1496 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1500 dp->dad_ns_ocount++;
1501 if (V_dad_enhanced != 0) {
1502 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1503 dp->dad_nonce[i] = arc4random();
1505 * XXXHRS: Note that in the case that
1506 * DupAddrDetectTransmits > 1, multiple NS messages with
1507 * different nonces can be looped back in an unexpected
1508 * order. The current implementation recognizes only
1509 * the latest nonce on the sender side. Practically it
1510 * should work well in almost all cases.
1513 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1514 (uint8_t *)&dp->dad_nonce[0]);
1518 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1523 panic("ifa == NULL in nd6_dad_ns_input");
1525 /* Ignore Nonce option when Enhanced DAD is disabled. */
1526 if (V_dad_enhanced == 0)
1528 dp = nd6_dad_find(ifa, ndopt_nonce);
1532 dp->dad_ns_icount++;
1537 nd6_dad_na_input(struct ifaddr *ifa)
1542 panic("ifa == NULL in nd6_dad_na_input");
1544 dp = nd6_dad_find(ifa, NULL);
1546 dp->dad_na_icount++;