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/malloc.h>
45 #include <sys/libkern.h>
47 #include <sys/rwlock.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
52 #include <sys/kernel.h>
53 #include <sys/errno.h>
54 #include <sys/sysctl.h>
55 #include <sys/syslog.h>
56 #include <sys/queue.h>
57 #include <sys/callout.h>
58 #include <sys/refcount.h>
61 #include <net/if_types.h>
62 #include <net/if_dl.h>
63 #include <net/if_var.h>
64 #include <net/route.h>
66 #include <net/radix_mpath.h>
70 #include <netinet/in.h>
71 #include <netinet/in_var.h>
72 #include <net/if_llatbl.h>
73 #include <netinet6/in6_var.h>
74 #include <netinet6/in6_ifattach.h>
75 #include <netinet/ip6.h>
76 #include <netinet6/ip6_var.h>
77 #include <netinet6/scope6_var.h>
78 #include <netinet6/nd6.h>
79 #include <netinet/icmp6.h>
80 #include <netinet/ip_carp.h>
81 #include <netinet6/send.h>
83 #define SDL(s) ((struct sockaddr_dl *)s)
86 static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
87 static void nd6_dad_add(struct dadq *dp);
88 static void nd6_dad_del(struct dadq *dp);
89 static void nd6_dad_rele(struct dadq *);
90 static void nd6_dad_starttimer(struct dadq *, int, int);
91 static void nd6_dad_stoptimer(struct dadq *);
92 static void nd6_dad_timer(struct dadq *);
93 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
94 static void nd6_dad_ns_output(struct dadq *);
95 static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
96 static void nd6_dad_na_input(struct ifaddr *);
97 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
98 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
99 static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
100 const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
102 static VNET_DEFINE(int, dad_enhanced) = 1;
103 #define V_dad_enhanced VNET(dad_enhanced)
105 SYSCTL_DECL(_net_inet6_ip6);
106 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
107 &VNET_NAME(dad_enhanced), 0,
108 "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
110 static VNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to
111 transmit DAD packet */
112 #define V_dad_maxtry VNET(dad_maxtry)
115 * Input a Neighbor Solicitation Message.
118 * Based on RFC 2462 (duplicate address detection)
121 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
123 struct ifnet *ifp = m->m_pkthdr.rcvif;
124 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
125 struct nd_neighbor_solicit *nd_ns;
126 struct in6_addr saddr6 = ip6->ip6_src;
127 struct in6_addr daddr6 = ip6->ip6_dst;
128 struct in6_addr taddr6;
129 struct in6_addr myaddr6;
131 struct ifaddr *ifa = NULL;
133 int anycast = 0, proxy = 0, tentative = 0;
136 union nd_opts ndopts;
137 struct sockaddr_dl proxydl;
138 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
140 /* RFC 6980: Nodes MUST silently ignore fragments */
141 if(m->m_flags & M_FRAGMENTED)
144 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
145 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
147 #ifndef PULLDOWN_TEST
148 IP6_EXTHDR_CHECK(m, off, icmp6len,);
149 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
151 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
153 ICMP6STAT_INC(icp6s_tooshort);
157 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
158 taddr6 = nd_ns->nd_ns_target;
159 if (in6_setscope(&taddr6, ifp, NULL) != 0)
162 if (ip6->ip6_hlim != 255) {
164 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
165 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
166 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
170 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
171 /* dst has to be a solicited node multicast address. */
172 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
173 /* don't check ifindex portion */
174 daddr6.s6_addr32[1] == 0 &&
175 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
176 daddr6.s6_addr8[12] == 0xff) {
179 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
180 "(wrong ip6 dst)\n"));
183 } else if (!V_nd6_onlink_ns_rfc4861) {
184 struct sockaddr_in6 src_sa6;
187 * According to recent IETF discussions, it is not a good idea
188 * to accept a NS from an address which would not be deemed
189 * to be a neighbor otherwise. This point is expected to be
190 * clarified in future revisions of the specification.
192 bzero(&src_sa6, sizeof(src_sa6));
193 src_sa6.sin6_family = AF_INET6;
194 src_sa6.sin6_len = sizeof(src_sa6);
195 src_sa6.sin6_addr = saddr6;
196 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
197 nd6log((LOG_INFO, "nd6_ns_input: "
198 "NS packet from non-neighbor\n"));
203 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
204 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
208 icmp6len -= sizeof(*nd_ns);
209 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
210 if (nd6_options(&ndopts) < 0) {
212 "nd6_ns_input: invalid ND option, ignored\n"));
213 /* nd6_options have incremented stats */
217 if (ndopts.nd_opts_src_lladdr) {
218 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
219 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
222 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
223 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
224 "(link-layer address option)\n"));
229 * Attaching target link-layer address to the NA?
232 * NS IP dst is unicast/anycast MUST NOT add
233 * NS IP dst is solicited-node multicast MUST add
235 * In implementation, we add target link-layer address by default.
236 * We do not add one in MUST NOT cases.
238 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
244 * Target address (taddr6) must be either:
245 * (1) Valid unicast/anycast address for my receiving interface,
246 * (2) Unicast address for which I'm offering proxy service, or
247 * (3) "tentative" address on which DAD is being performed.
249 /* (1) and (3) check. */
251 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
253 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
257 struct sockaddr_dl rt_gateway;
258 struct rt_addrinfo info;
259 struct sockaddr_in6 dst6;
261 bzero(&dst6, sizeof(dst6));
262 dst6.sin6_len = sizeof(struct sockaddr_in6);
263 dst6.sin6_family = AF_INET6;
264 dst6.sin6_addr = taddr6;
266 bzero(&rt_gateway, sizeof(rt_gateway));
267 rt_gateway.sdl_len = sizeof(rt_gateway);
268 bzero(&info, sizeof(info));
269 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
271 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
273 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
274 rt_gateway.sdl_family == AF_LINK) {
277 * proxy NDP for single entry
279 proxydl = *SDL(&rt_gateway);
280 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
281 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
289 * We've got an NS packet, and we don't have that adddress
290 * assigned for us. We MUST silently ignore it.
295 myaddr6 = *IFA_IN6(ifa);
296 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
297 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
298 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
301 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
302 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
303 "(if %d, NS packet %d)\n",
304 ip6_sprintf(ip6bufs, &taddr6),
305 ifp->if_addrlen, lladdrlen - 2));
309 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
310 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
311 ip6_sprintf(ip6bufs, &saddr6)));
316 * We have neighbor solicitation packet, with target address equals to
317 * one of my tentative address.
319 * src addr how to process?
321 * multicast of course, invalid (rejected in ip6_input)
322 * unicast somebody is doing address resolution -> ignore
323 * unspec dup address detection
325 * The processing is defined in RFC 2462.
329 * If source address is unspecified address, it is for
330 * duplicate address detection.
332 * If not, the packet is for addess resolution;
333 * silently ignore it.
335 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
336 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
342 * If the source address is unspecified address, entries must not
343 * be created or updated.
344 * It looks that sender is performing DAD. Output NA toward
345 * all-node multicast address, to tell the sender that I'm using
347 * S bit ("solicited") must be zero.
349 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
350 struct in6_addr in6_all;
352 in6_all = in6addr_linklocal_allnodes;
353 if (in6_setscope(&in6_all, ifp, NULL) != 0)
355 nd6_na_output_fib(ifp, &in6_all, &taddr6,
356 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
357 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
362 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
363 ND_NEIGHBOR_SOLICIT, 0);
365 nd6_na_output_fib(ifp, &saddr6, &taddr6,
366 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
367 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
368 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
376 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
377 ip6_sprintf(ip6bufs, &saddr6)));
378 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
379 ip6_sprintf(ip6bufs, &daddr6)));
380 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
381 ip6_sprintf(ip6bufs, &taddr6)));
382 ICMP6STAT_INC(icp6s_badns);
389 * Output a Neighbor Solicitation Message. Caller specifies:
390 * - ICMP6 header source IP6 address
391 * - ND6 header target IP6 address
392 * - ND6 header source datalink address
395 * Based on RFC 2462 (duplicate address detection)
397 * ln - for source address determination
398 * nonce - If non-NULL, NS is used for duplicate address detection and
399 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
402 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
403 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
404 uint8_t *nonce, u_int fibnum)
409 struct nd_neighbor_solicit *nd_ns;
410 struct ip6_moptions im6o;
415 if (IN6_IS_ADDR_MULTICAST(taddr6))
418 /* estimate the size of message */
419 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
420 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
421 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
422 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
423 __func__, max_linkhdr, maxlen, MCLBYTES));
425 if (max_linkhdr + maxlen > MHLEN)
426 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
428 m = m_gethdr(M_NOWAIT, MT_DATA);
433 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
434 m->m_flags |= M_MCAST;
435 im6o.im6o_multicast_ifp = ifp;
436 im6o.im6o_multicast_hlim = 255;
437 im6o.im6o_multicast_loop = 0;
440 icmp6len = sizeof(*nd_ns);
441 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
442 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
444 /* fill neighbor solicitation packet */
445 ip6 = mtod(m, struct ip6_hdr *);
447 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
448 ip6->ip6_vfc |= IPV6_VERSION;
449 /* ip6->ip6_plen will be set later */
450 ip6->ip6_nxt = IPPROTO_ICMPV6;
453 ip6->ip6_dst = *daddr6;
455 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
456 ip6->ip6_dst.s6_addr16[1] = 0;
457 ip6->ip6_dst.s6_addr32[1] = 0;
458 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
459 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
460 ip6->ip6_dst.s6_addr8[12] = 0xff;
461 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
465 struct ifaddr *ifa = NULL;
469 * "If the source address of the packet prompting the
470 * solicitation is the same as one of the addresses assigned
471 * to the outgoing interface, that address SHOULD be placed
472 * in the IP Source Address of the outgoing solicitation.
473 * Otherwise, any one of the addresses assigned to the
474 * interface should be used."
476 * We use the source address for the prompting packet
477 * (saddr6), if saddr6 belongs to the outgoing interface.
478 * Otherwise, we perform the source address selection as usual.
482 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
484 /* ip6_src set already. */
485 ip6->ip6_src = *saddr6;
489 struct in6_addr dst6, src6;
492 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
493 error = in6_selectsrc_addr(fibnum, &dst6,
494 scopeid, ifp, &src6, NULL);
496 char ip6buf[INET6_ADDRSTRLEN];
497 nd6log((LOG_DEBUG, "%s: source can't be "
498 "determined: dst=%s, error=%d\n", __func__,
499 ip6_sprintf(ip6buf, &dst6),
507 * Source address for DAD packet must always be IPv6
508 * unspecified address. (0::0)
509 * We actually don't have to 0-clear the address (we did it
510 * above), but we do so here explicitly to make the intention
513 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
515 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
516 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
517 nd_ns->nd_ns_code = 0;
518 nd_ns->nd_ns_reserved = 0;
519 nd_ns->nd_ns_target = *taddr6;
520 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
523 * Add source link-layer address option.
525 * spec implementation
527 * DAD packet MUST NOT do not add the option
528 * there's no link layer address:
529 * impossible do not add the option
530 * there's link layer address:
531 * Multicast NS MUST add one add the option
532 * Unicast NS SHOULD add one add the option
534 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
535 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
536 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
537 /* 8 byte alignments... */
538 optlen = (optlen + 7) & ~7;
540 m->m_pkthdr.len += optlen;
543 bzero((caddr_t)nd_opt, optlen);
544 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
545 nd_opt->nd_opt_len = optlen >> 3;
546 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
549 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
550 * This behavior is documented as Enhanced Duplicate Address
551 * Detection in RFC 7527.
552 * net.inet6.ip6.dad_enhanced=0 disables this.
554 if (V_dad_enhanced != 0 && nonce != NULL) {
555 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
556 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
557 /* 8-byte alignment is required. */
558 optlen = (optlen + 7) & ~7;
560 m->m_pkthdr.len += optlen;
563 bzero((caddr_t)nd_opt, optlen);
564 nd_opt->nd_opt_type = ND_OPT_NONCE;
565 nd_opt->nd_opt_len = optlen >> 3;
566 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
568 ip6->ip6_plen = htons((u_short)icmp6len);
569 nd_ns->nd_ns_cksum = 0;
571 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
573 if (send_sendso_input_hook != NULL) {
574 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
575 sizeof(unsigned short), M_NOWAIT);
578 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
579 m_tag_prepend(m, mtag);
582 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
584 icmp6_ifstat_inc(ifp, ifs6_out_msg);
585 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
586 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
596 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
597 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
600 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
604 * Neighbor advertisement input handling.
607 * Based on RFC 2462 (duplicate address detection)
609 * the following items are not implemented yet:
610 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
611 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
614 nd6_na_input(struct mbuf *m, int off, int icmp6len)
616 struct ifnet *ifp = m->m_pkthdr.rcvif;
617 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
618 struct nd_neighbor_advert *nd_na;
619 struct in6_addr daddr6 = ip6->ip6_dst;
620 struct in6_addr taddr6;
629 struct llentry *ln = NULL;
630 union nd_opts ndopts;
631 struct mbuf *chain = NULL;
632 struct sockaddr_in6 sin6;
633 u_char linkhdr[LLE_MAX_LINKHDR];
636 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
638 /* RFC 6980: Nodes MUST silently ignore fragments */
639 if(m->m_flags & M_FRAGMENTED)
642 if (ip6->ip6_hlim != 255) {
644 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
645 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
646 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
650 #ifndef PULLDOWN_TEST
651 IP6_EXTHDR_CHECK(m, off, icmp6len,);
652 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
654 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
656 ICMP6STAT_INC(icp6s_tooshort);
661 flags = nd_na->nd_na_flags_reserved;
662 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
663 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
664 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
665 memset(&sin6, 0, sizeof(sin6));
667 taddr6 = nd_na->nd_na_target;
668 if (in6_setscope(&taddr6, ifp, NULL))
669 goto bad; /* XXX: impossible */
671 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
673 "nd6_na_input: invalid target address %s\n",
674 ip6_sprintf(ip6bufs, &taddr6)));
677 if (IN6_IS_ADDR_MULTICAST(&daddr6))
680 "nd6_na_input: a solicited adv is multicasted\n"));
684 icmp6len -= sizeof(*nd_na);
685 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
686 if (nd6_options(&ndopts) < 0) {
688 "nd6_na_input: invalid ND option, ignored\n"));
689 /* nd6_options have incremented stats */
693 if (ndopts.nd_opts_tgt_lladdr) {
694 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
695 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
699 * This effectively disables the DAD check on a non-master CARP
703 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
705 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
708 * Target address matches one of my interface address.
710 * If my address is tentative, this means that there's somebody
711 * already using the same address as mine. This indicates DAD failure.
712 * This is defined in RFC 2462.
714 * Otherwise, process as defined in RFC 2461.
717 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
718 nd6_dad_na_input(ifa);
723 /* Just for safety, maybe unnecessary. */
727 "nd6_na_input: duplicate IP6 address %s\n",
728 ip6_sprintf(ip6bufs, &taddr6));
732 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
733 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
734 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
735 ifp->if_addrlen, lladdrlen - 2));
740 * If no neighbor cache entry is found, NA SHOULD silently be
743 IF_AFDATA_RLOCK(ifp);
744 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
745 IF_AFDATA_RUNLOCK(ifp);
750 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
752 * If the link-layer has address, and no lladdr option came,
753 * discard the packet.
755 if (ifp->if_addrlen && lladdr == NULL) {
760 * Record link-layer address, and update the state.
762 linkhdrsize = sizeof(linkhdr);
763 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
764 linkhdr, &linkhdrsize, &lladdr_off) != 0)
767 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
772 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
774 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
776 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
777 if ((ln->ln_router = is_router) != 0) {
779 * This means a router's state has changed from
780 * non-reachable to probably reachable, and might
781 * affect the status of associated prefixes..
789 * Check if the link-layer address has changed or not.
794 if (ln->la_flags & LLE_VALID) {
795 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
804 * This is VERY complex. Look at it with care.
806 * override solicit lladdr llchange action
811 * 0 0 y y (1) REACHABLE->STALE
812 * 0 1 n -- (2c) *->REACHABLE
813 * 0 1 y n (2b) L *->REACHABLE
814 * 0 1 y y (1) REACHABLE->STALE
817 * 1 0 y y (2a) L *->STALE
818 * 1 1 n -- (2a) *->REACHABLE
819 * 1 1 y n (2a) L *->REACHABLE
820 * 1 1 y y (2a) L *->REACHABLE
822 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
824 * If state is REACHABLE, make it STALE.
825 * no other updates should be done.
827 if (ln->ln_state == ND6_LLINFO_REACHABLE)
828 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
830 } else if (is_override /* (2a) */
831 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
832 || lladdr == NULL) { /* (2c) */
834 * Update link-local address, if any.
836 if (lladdr != NULL) {
837 linkhdrsize = sizeof(linkhdr);
838 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
839 linkhdr, &linkhdrsize, &lladdr_off) != 0)
841 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
842 linkhdrsize, lladdr_off) == 0) {
846 EVENTHANDLER_INVOKE(lle_event, ln,
851 * If solicited, make the state REACHABLE.
852 * If not solicited and the link-layer address was
853 * changed, make it STALE.
856 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
858 if (lladdr != NULL && llchange)
859 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
863 if (ln->ln_router && !is_router) {
865 * The peer dropped the router flag.
866 * Remove the sender from the Default Router List and
867 * update the Destination Cache entries.
869 struct ifnet *nd6_ifp;
871 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
872 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
873 (ND_IFINFO(nd6_ifp)->flags &
874 ND6_IFF_ACCEPT_RTADV) != 0)
876 * Even if the neighbor is not in the default
877 * router list, the neighbor may be used as a
878 * next hop for some destinations (e.g. redirect
879 * case). So we must call rt6_flush explicitly.
881 rt6_flush(&ip6->ip6_src, ifp);
883 ln->ln_router = is_router;
887 * rt->rt_flags &= ~RTF_REJECT;
890 if (ln->la_hold != NULL)
891 nd6_grab_holdchain(ln, &chain, &sin6);
897 nd6_flush_holdchain(ifp, chain, &sin6);
900 pfxlist_onlink_check();
909 ICMP6STAT_INC(icp6s_badna);
914 * Neighbor advertisement output handling.
918 * the following items are not implemented yet:
919 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
920 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
922 * tlladdr - 1 if include target link-layer address
923 * sdl0 - sockaddr_dl (= proxy NA) or NULL
926 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
927 const struct in6_addr *taddr6, u_long flags, int tlladdr,
928 struct sockaddr *sdl0, u_int fibnum)
933 struct nd_neighbor_advert *nd_na;
934 struct ip6_moptions im6o;
935 struct in6_addr daddr6, dst6, src6;
938 int icmp6len, maxlen, error;
941 daddr6 = *daddr6_0; /* make a local copy for modification */
943 /* estimate the size of message */
944 maxlen = sizeof(*ip6) + sizeof(*nd_na);
945 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
946 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
947 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
948 __func__, max_linkhdr, maxlen, MCLBYTES));
950 if (max_linkhdr + maxlen > MHLEN)
951 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
953 m = m_gethdr(M_NOWAIT, MT_DATA);
958 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
959 m->m_flags |= M_MCAST;
960 im6o.im6o_multicast_ifp = ifp;
961 im6o.im6o_multicast_hlim = 255;
962 im6o.im6o_multicast_loop = 0;
965 icmp6len = sizeof(*nd_na);
966 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
967 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
969 /* fill neighbor advertisement packet */
970 ip6 = mtod(m, struct ip6_hdr *);
972 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
973 ip6->ip6_vfc |= IPV6_VERSION;
974 ip6->ip6_nxt = IPPROTO_ICMPV6;
976 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
978 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
979 daddr6.s6_addr16[1] = 0;
980 daddr6.s6_addr32[1] = 0;
981 daddr6.s6_addr32[2] = 0;
982 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
983 if (in6_setscope(&daddr6, ifp, NULL))
986 flags &= ~ND_NA_FLAG_SOLICITED;
988 ip6->ip6_dst = daddr6;
991 * Select a source whose scope is the same as that of the dest.
993 in6_splitscope(&daddr6, &dst6, &scopeid);
994 error = in6_selectsrc_addr(fibnum, &dst6,
995 scopeid, ifp, &src6, NULL);
997 char ip6buf[INET6_ADDRSTRLEN];
998 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
999 "determined: dst=%s, error=%d\n",
1000 ip6_sprintf(ip6buf, &daddr6), error));
1003 ip6->ip6_src = src6;
1004 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1005 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1006 nd_na->nd_na_code = 0;
1007 nd_na->nd_na_target = *taddr6;
1008 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1011 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1012 * see nd6_ns_input() for details.
1013 * Basically, if NS packet is sent to unicast/anycast addr,
1014 * target lladdr option SHOULD NOT be included.
1018 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1019 * lladdr in sdl0. If we are not proxying (sending NA for
1020 * my address) use lladdr configured for the interface.
1024 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1026 mac = nd6_ifptomac(ifp);
1027 } else if (sdl0->sa_family == AF_LINK) {
1028 struct sockaddr_dl *sdl;
1029 sdl = (struct sockaddr_dl *)sdl0;
1030 if (sdl->sdl_alen == ifp->if_addrlen)
1034 if (tlladdr && mac) {
1035 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1036 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1038 /* roundup to 8 bytes alignment! */
1039 optlen = (optlen + 7) & ~7;
1041 m->m_pkthdr.len += optlen;
1044 bzero((caddr_t)nd_opt, optlen);
1045 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1046 nd_opt->nd_opt_len = optlen >> 3;
1047 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1049 flags &= ~ND_NA_FLAG_OVERRIDE;
1051 ip6->ip6_plen = htons((u_short)icmp6len);
1052 nd_na->nd_na_flags_reserved = flags;
1053 nd_na->nd_na_cksum = 0;
1054 nd_na->nd_na_cksum =
1055 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1057 if (send_sendso_input_hook != NULL) {
1058 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1059 sizeof(unsigned short), M_NOWAIT);
1062 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1063 m_tag_prepend(m, mtag);
1066 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1067 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1068 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1069 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1077 #ifndef BURN_BRIDGES
1079 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1080 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1081 struct sockaddr *sdl0)
1084 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1090 nd6_ifptomac(struct ifnet *ifp)
1092 switch (ifp->if_type) {
1098 case IFT_INFINIBAND:
1101 return IF_LLADDR(ifp);
1108 TAILQ_ENTRY(dadq) dad_list;
1109 struct ifaddr *dad_ifa;
1110 int dad_count; /* max NS to send */
1111 int dad_ns_tcount; /* # of trials to send NS */
1112 int dad_ns_ocount; /* NS sent so far */
1115 int dad_ns_lcount; /* looped back NS */
1116 int dad_loopbackprobe; /* probing state for loopback detection */
1117 struct callout dad_timer_ch;
1118 struct vnet *dad_vnet;
1120 #define ND_OPT_NONCE_LEN32 \
1121 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1122 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1125 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1126 static VNET_DEFINE(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);
1145 nd6_dad_del(struct dadq *dp)
1149 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1154 static struct dadq *
1155 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1160 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1161 if (dp->dad_ifa != ifa)
1164 * Skip if the nonce matches the received one.
1165 * +2 in the length is required because of type and
1166 * length fields are included in a header.
1169 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1170 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1171 ND_OPT_NONCE_LEN) == 0) {
1172 dp->dad_ns_lcount++;
1175 refcount_acquire(&dp->dad_refcnt);
1184 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1188 nd6_dad_ns_output(dp);
1189 callout_reset(&dp->dad_timer_ch, ticks,
1190 (void (*)(void *))nd6_dad_timer, (void *)dp);
1194 nd6_dad_stoptimer(struct dadq *dp)
1197 callout_drain(&dp->dad_timer_ch);
1201 nd6_dad_rele(struct dadq *dp)
1204 if (refcount_release(&dp->dad_refcnt)) {
1205 ifa_free(dp->dad_ifa);
1214 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1215 TAILQ_INIT(&V_dadq);
1219 * Start Duplicate Address Detection (DAD) for specified interface address.
1222 nd6_dad_start(struct ifaddr *ifa, int delay)
1224 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1226 char ip6buf[INET6_ADDRSTRLEN];
1228 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1229 ("starting DAD on non-tentative address %p", ifa));
1232 * If we don't need DAD, don't do it.
1233 * There are several cases:
1234 * - DAD is disabled globally or on the interface
1235 * - the interface address is anycast
1237 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1238 V_ip6_dad_count == 0 ||
1239 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1240 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1243 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1244 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1245 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1248 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1250 * DAD is already in progress. Let the existing entry
1257 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1259 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1261 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1262 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1265 callout_init(&dp->dad_timer_ch, 0);
1267 dp->dad_vnet = curvnet;
1269 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1270 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1273 * Send NS packet for DAD, ip6_dad_count times.
1274 * Note that we must delay the first transmission, if this is the
1275 * first packet to be sent from the interface after interface
1276 * (re)initialization.
1279 ifa_ref(dp->dad_ifa);
1280 dp->dad_count = V_ip6_dad_count;
1281 dp->dad_ns_icount = dp->dad_na_icount = 0;
1282 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1283 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1284 refcount_init(&dp->dad_refcnt, 1);
1286 nd6_dad_starttimer(dp, delay, 0);
1290 * terminate DAD unconditionally. used for address removals.
1293 nd6_dad_stop(struct ifaddr *ifa)
1297 dp = nd6_dad_find(ifa, NULL);
1299 /* DAD wasn't started yet */
1303 nd6_dad_stoptimer(dp);
1306 * The DAD queue entry may have been removed by nd6_dad_timer() while
1307 * we were waiting for it to stop, so re-do the lookup.
1310 dp = nd6_dad_find(ifa, NULL);
1319 nd6_dad_timer(struct dadq *dp)
1321 CURVNET_SET(dp->dad_vnet);
1322 struct ifaddr *ifa = dp->dad_ifa;
1323 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1324 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1325 char ip6buf[INET6_ADDRSTRLEN];
1327 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1329 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1330 /* Do not need DAD for ifdisabled interface. */
1331 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1332 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1335 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1336 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1338 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1339 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1342 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1343 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1345 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1346 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1350 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1351 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1352 (((ifp->if_flags & IFF_UP) == 0) ||
1353 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1354 nd6log((LOG_INFO, "%s: could not run DAD "
1355 "because the interface was down or not running.\n",
1356 if_name(ifa->ifa_ifp)));
1360 /* Need more checks? */
1361 if (dp->dad_ns_ocount < dp->dad_count) {
1363 * We have more NS to go. Send NS packet for DAD.
1365 nd6_dad_starttimer(dp,
1366 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1370 * We have transmitted sufficient number of DAD packets.
1371 * See what we've got.
1373 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1374 /* We've seen NS or NA, means DAD has failed. */
1375 nd6_dad_duplicated(ifa, dp);
1376 else if (V_dad_enhanced != 0 &&
1377 dp->dad_ns_lcount > 0 &&
1378 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1380 * Sec. 4.1 in RFC 7527 requires transmission of
1381 * additional probes until the loopback condition
1382 * becomes clear when a looped back probe is detected.
1384 log(LOG_ERR, "%s: a looped back NS message is "
1385 "detected during DAD for %s. "
1386 "Another DAD probes are being sent.\n",
1387 if_name(ifa->ifa_ifp),
1388 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1389 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1391 * Send an NS immediately and increase dad_count by
1392 * V_nd6_mmaxtries - 1.
1395 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1396 nd6_dad_starttimer(dp,
1397 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1402 * We are done with DAD. No NA came, no NS came.
1403 * No duplicate address found. Check IFDISABLED flag
1404 * again in case that it is changed between the
1405 * beginning of this function and here.
1407 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1408 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1411 "%s: DAD complete for %s - no duplicates found\n",
1412 if_name(ifa->ifa_ifp),
1413 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1414 if (dp->dad_ns_lcount > 0)
1415 log(LOG_ERR, "%s: DAD completed while "
1416 "a looped back NS message is detected "
1417 "during DAD for %s.\n",
1418 if_name(ifa->ifa_ifp),
1419 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1429 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1431 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1433 char ip6buf[INET6_ADDRSTRLEN];
1435 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1436 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1437 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1438 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1441 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1442 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1445 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1446 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1447 log(LOG_ERR, "%s: manual intervention required\n",
1451 * If the address is a link-local address formed from an interface
1452 * identifier based on the hardware address which is supposed to be
1453 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1454 * operation on the interface SHOULD be disabled.
1455 * [RFC 4862, Section 5.4.5]
1457 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1458 struct in6_addr in6;
1461 * To avoid over-reaction, we only apply this logic when we are
1462 * very sure that hardware addresses are supposed to be unique.
1464 switch (ifp->if_type) {
1469 case IFT_INFINIBAND:
1470 in6 = ia->ia_addr.sin6_addr;
1471 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1472 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1473 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1474 log(LOG_ERR, "%s: possible hardware address "
1475 "duplication detected, disable IPv6\n",
1484 nd6_dad_ns_output(struct dadq *dp)
1486 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1487 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1490 dp->dad_ns_tcount++;
1491 if ((ifp->if_flags & IFF_UP) == 0) {
1494 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1498 dp->dad_ns_ocount++;
1499 if (V_dad_enhanced != 0) {
1500 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1501 dp->dad_nonce[i] = arc4random();
1503 * XXXHRS: Note that in the case that
1504 * DupAddrDetectTransmits > 1, multiple NS messages with
1505 * different nonces can be looped back in an unexpected
1506 * order. The current implementation recognizes only
1507 * the latest nonce on the sender side. Practically it
1508 * should work well in almost all cases.
1511 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1512 (uint8_t *)&dp->dad_nonce[0]);
1516 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1521 panic("ifa == NULL in nd6_dad_ns_input");
1523 /* Ignore Nonce option when Enhanced DAD is disabled. */
1524 if (V_dad_enhanced == 0)
1526 dp = nd6_dad_find(ifa, ndopt_nonce);
1530 dp->dad_ns_icount++;
1535 nd6_dad_na_input(struct ifaddr *ifa)
1540 panic("ifa == NULL in nd6_dad_na_input");
1542 dp = nd6_dad_find(ifa, NULL);
1544 dp->dad_na_icount++;