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 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
141 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
143 #ifndef PULLDOWN_TEST
144 IP6_EXTHDR_CHECK(m, off, icmp6len,);
145 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
147 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
149 ICMP6STAT_INC(icp6s_tooshort);
153 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
154 taddr6 = nd_ns->nd_ns_target;
155 if (in6_setscope(&taddr6, ifp, NULL) != 0)
158 if (ip6->ip6_hlim != 255) {
160 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
161 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
162 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
166 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
167 /* dst has to be a solicited node multicast address. */
168 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
169 /* don't check ifindex portion */
170 daddr6.s6_addr32[1] == 0 &&
171 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
172 daddr6.s6_addr8[12] == 0xff) {
175 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
176 "(wrong ip6 dst)\n"));
179 } else if (!V_nd6_onlink_ns_rfc4861) {
180 struct sockaddr_in6 src_sa6;
183 * According to recent IETF discussions, it is not a good idea
184 * to accept a NS from an address which would not be deemed
185 * to be a neighbor otherwise. This point is expected to be
186 * clarified in future revisions of the specification.
188 bzero(&src_sa6, sizeof(src_sa6));
189 src_sa6.sin6_family = AF_INET6;
190 src_sa6.sin6_len = sizeof(src_sa6);
191 src_sa6.sin6_addr = saddr6;
192 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
193 nd6log((LOG_INFO, "nd6_ns_input: "
194 "NS packet from non-neighbor\n"));
199 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
200 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
204 icmp6len -= sizeof(*nd_ns);
205 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
206 if (nd6_options(&ndopts) < 0) {
208 "nd6_ns_input: invalid ND option, ignored\n"));
209 /* nd6_options have incremented stats */
213 if (ndopts.nd_opts_src_lladdr) {
214 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
215 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
218 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
219 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
220 "(link-layer address option)\n"));
225 * Attaching target link-layer address to the NA?
228 * NS IP dst is unicast/anycast MUST NOT add
229 * NS IP dst is solicited-node multicast MUST add
231 * In implementation, we add target link-layer address by default.
232 * We do not add one in MUST NOT cases.
234 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
240 * Target address (taddr6) must be either:
241 * (1) Valid unicast/anycast address for my receiving interface,
242 * (2) Unicast address for which I'm offering proxy service, or
243 * (3) "tentative" address on which DAD is being performed.
245 /* (1) and (3) check. */
247 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
249 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
253 struct sockaddr_dl rt_gateway;
254 struct rt_addrinfo info;
255 struct sockaddr_in6 dst6;
257 bzero(&dst6, sizeof(dst6));
258 dst6.sin6_len = sizeof(struct sockaddr_in6);
259 dst6.sin6_family = AF_INET6;
260 dst6.sin6_addr = taddr6;
262 bzero(&rt_gateway, sizeof(rt_gateway));
263 rt_gateway.sdl_len = sizeof(rt_gateway);
264 bzero(&info, sizeof(info));
265 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
267 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
269 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
270 rt_gateway.sdl_family == AF_LINK) {
273 * proxy NDP for single entry
275 proxydl = *SDL(&rt_gateway);
276 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
277 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
285 * We've got an NS packet, and we don't have that adddress
286 * assigned for us. We MUST silently ignore it.
291 myaddr6 = *IFA_IN6(ifa);
292 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
293 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
294 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
297 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
298 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
299 "(if %d, NS packet %d)\n",
300 ip6_sprintf(ip6bufs, &taddr6),
301 ifp->if_addrlen, lladdrlen - 2));
305 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
306 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
307 ip6_sprintf(ip6bufs, &saddr6)));
312 * We have neighbor solicitation packet, with target address equals to
313 * one of my tentative address.
315 * src addr how to process?
317 * multicast of course, invalid (rejected in ip6_input)
318 * unicast somebody is doing address resolution -> ignore
319 * unspec dup address detection
321 * The processing is defined in RFC 2462.
325 * If source address is unspecified address, it is for
326 * duplicate address detection.
328 * If not, the packet is for addess resolution;
329 * silently ignore it.
331 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
332 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
338 * If the source address is unspecified address, entries must not
339 * be created or updated.
340 * It looks that sender is performing DAD. Output NA toward
341 * all-node multicast address, to tell the sender that I'm using
343 * S bit ("solicited") must be zero.
345 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
346 struct in6_addr in6_all;
348 in6_all = in6addr_linklocal_allnodes;
349 if (in6_setscope(&in6_all, ifp, NULL) != 0)
351 nd6_na_output_fib(ifp, &in6_all, &taddr6,
352 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
353 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
358 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
359 ND_NEIGHBOR_SOLICIT, 0);
361 nd6_na_output_fib(ifp, &saddr6, &taddr6,
362 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
363 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
364 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
372 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
373 ip6_sprintf(ip6bufs, &saddr6)));
374 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
375 ip6_sprintf(ip6bufs, &daddr6)));
376 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
377 ip6_sprintf(ip6bufs, &taddr6)));
378 ICMP6STAT_INC(icp6s_badns);
385 * Output a Neighbor Solicitation Message. Caller specifies:
386 * - ICMP6 header source IP6 address
387 * - ND6 header target IP6 address
388 * - ND6 header source datalink address
391 * Based on RFC 2462 (duplicate address detection)
393 * ln - for source address determination
394 * nonce - If non-NULL, NS is used for duplicate address detection and
395 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
398 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
399 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
400 uint8_t *nonce, u_int fibnum)
405 struct nd_neighbor_solicit *nd_ns;
406 struct ip6_moptions im6o;
411 if (IN6_IS_ADDR_MULTICAST(taddr6))
414 /* estimate the size of message */
415 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
416 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
417 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
418 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
419 __func__, max_linkhdr, maxlen, MCLBYTES));
421 if (max_linkhdr + maxlen > MHLEN)
422 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
424 m = m_gethdr(M_NOWAIT, MT_DATA);
429 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
430 m->m_flags |= M_MCAST;
431 im6o.im6o_multicast_ifp = ifp;
432 im6o.im6o_multicast_hlim = 255;
433 im6o.im6o_multicast_loop = 0;
436 icmp6len = sizeof(*nd_ns);
437 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
438 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
440 /* fill neighbor solicitation packet */
441 ip6 = mtod(m, struct ip6_hdr *);
443 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
444 ip6->ip6_vfc |= IPV6_VERSION;
445 /* ip6->ip6_plen will be set later */
446 ip6->ip6_nxt = IPPROTO_ICMPV6;
449 ip6->ip6_dst = *daddr6;
451 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
452 ip6->ip6_dst.s6_addr16[1] = 0;
453 ip6->ip6_dst.s6_addr32[1] = 0;
454 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
455 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
456 ip6->ip6_dst.s6_addr8[12] = 0xff;
457 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
461 struct ifaddr *ifa = NULL;
465 * "If the source address of the packet prompting the
466 * solicitation is the same as one of the addresses assigned
467 * to the outgoing interface, that address SHOULD be placed
468 * in the IP Source Address of the outgoing solicitation.
469 * Otherwise, any one of the addresses assigned to the
470 * interface should be used."
472 * We use the source address for the prompting packet
473 * (saddr6), if saddr6 belongs to the outgoing interface.
474 * Otherwise, we perform the source address selection as usual.
478 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
480 /* ip6_src set already. */
481 ip6->ip6_src = *saddr6;
485 struct in6_addr dst6, src6;
488 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
489 error = in6_selectsrc_addr(fibnum, &dst6,
490 scopeid, ifp, &src6, NULL);
492 char ip6buf[INET6_ADDRSTRLEN];
493 nd6log((LOG_DEBUG, "%s: source can't be "
494 "determined: dst=%s, error=%d\n", __func__,
495 ip6_sprintf(ip6buf, &dst6),
503 * Source address for DAD packet must always be IPv6
504 * unspecified address. (0::0)
505 * We actually don't have to 0-clear the address (we did it
506 * above), but we do so here explicitly to make the intention
509 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
511 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
512 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
513 nd_ns->nd_ns_code = 0;
514 nd_ns->nd_ns_reserved = 0;
515 nd_ns->nd_ns_target = *taddr6;
516 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
519 * Add source link-layer address option.
521 * spec implementation
523 * DAD packet MUST NOT do not add the option
524 * there's no link layer address:
525 * impossible do not add the option
526 * there's link layer address:
527 * Multicast NS MUST add one add the option
528 * Unicast NS SHOULD add one add the option
530 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
531 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
532 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
533 /* 8 byte alignments... */
534 optlen = (optlen + 7) & ~7;
536 m->m_pkthdr.len += optlen;
539 bzero((caddr_t)nd_opt, optlen);
540 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
541 nd_opt->nd_opt_len = optlen >> 3;
542 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
545 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
546 * This behavior is documented as Enhanced Duplicate Address
547 * Detection in RFC 7527.
548 * net.inet6.ip6.dad_enhanced=0 disables this.
550 if (V_dad_enhanced != 0 && nonce != NULL) {
551 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
552 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
553 /* 8-byte alignment is required. */
554 optlen = (optlen + 7) & ~7;
556 m->m_pkthdr.len += optlen;
559 bzero((caddr_t)nd_opt, optlen);
560 nd_opt->nd_opt_type = ND_OPT_NONCE;
561 nd_opt->nd_opt_len = optlen >> 3;
562 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
564 ip6->ip6_plen = htons((u_short)icmp6len);
565 nd_ns->nd_ns_cksum = 0;
567 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
569 if (send_sendso_input_hook != NULL) {
570 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
571 sizeof(unsigned short), M_NOWAIT);
574 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
575 m_tag_prepend(m, mtag);
578 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
580 icmp6_ifstat_inc(ifp, ifs6_out_msg);
581 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
582 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
592 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
593 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
596 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
600 * Neighbor advertisement input handling.
603 * Based on RFC 2462 (duplicate address detection)
605 * the following items are not implemented yet:
606 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
607 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
610 nd6_na_input(struct mbuf *m, int off, int icmp6len)
612 struct ifnet *ifp = m->m_pkthdr.rcvif;
613 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
614 struct nd_neighbor_advert *nd_na;
615 struct in6_addr daddr6 = ip6->ip6_dst;
616 struct in6_addr taddr6;
625 struct llentry *ln = NULL;
626 union nd_opts ndopts;
627 struct mbuf *chain = NULL;
628 struct sockaddr_in6 sin6;
629 u_char linkhdr[LLE_MAX_LINKHDR];
632 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
634 if (ip6->ip6_hlim != 255) {
636 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
637 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
638 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
642 #ifndef PULLDOWN_TEST
643 IP6_EXTHDR_CHECK(m, off, icmp6len,);
644 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
646 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
648 ICMP6STAT_INC(icp6s_tooshort);
653 flags = nd_na->nd_na_flags_reserved;
654 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
655 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
656 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
657 memset(&sin6, 0, sizeof(sin6));
659 taddr6 = nd_na->nd_na_target;
660 if (in6_setscope(&taddr6, ifp, NULL))
661 goto bad; /* XXX: impossible */
663 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
665 "nd6_na_input: invalid target address %s\n",
666 ip6_sprintf(ip6bufs, &taddr6)));
669 if (IN6_IS_ADDR_MULTICAST(&daddr6))
672 "nd6_na_input: a solicited adv is multicasted\n"));
676 icmp6len -= sizeof(*nd_na);
677 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
678 if (nd6_options(&ndopts) < 0) {
680 "nd6_na_input: invalid ND option, ignored\n"));
681 /* nd6_options have incremented stats */
685 if (ndopts.nd_opts_tgt_lladdr) {
686 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
687 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
691 * This effectively disables the DAD check on a non-master CARP
695 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
697 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
700 * Target address matches one of my interface address.
702 * If my address is tentative, this means that there's somebody
703 * already using the same address as mine. This indicates DAD failure.
704 * This is defined in RFC 2462.
706 * Otherwise, process as defined in RFC 2461.
709 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
710 nd6_dad_na_input(ifa);
715 /* Just for safety, maybe unnecessary. */
719 "nd6_na_input: duplicate IP6 address %s\n",
720 ip6_sprintf(ip6bufs, &taddr6));
724 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
725 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
726 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
727 ifp->if_addrlen, lladdrlen - 2));
732 * If no neighbor cache entry is found, NA SHOULD silently be
735 IF_AFDATA_RLOCK(ifp);
736 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
737 IF_AFDATA_RUNLOCK(ifp);
742 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
744 * If the link-layer has address, and no lladdr option came,
745 * discard the packet.
747 if (ifp->if_addrlen && lladdr == NULL) {
752 * Record link-layer address, and update the state.
754 linkhdrsize = sizeof(linkhdr);
755 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
756 linkhdr, &linkhdrsize, &lladdr_off) != 0)
759 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
764 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
766 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
768 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
769 if ((ln->ln_router = is_router) != 0) {
771 * This means a router's state has changed from
772 * non-reachable to probably reachable, and might
773 * affect the status of associated prefixes..
781 * Check if the link-layer address has changed or not.
786 if (ln->la_flags & LLE_VALID) {
787 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
796 * This is VERY complex. Look at it with care.
798 * override solicit lladdr llchange action
803 * 0 0 y y (1) REACHABLE->STALE
804 * 0 1 n -- (2c) *->REACHABLE
805 * 0 1 y n (2b) L *->REACHABLE
806 * 0 1 y y (1) REACHABLE->STALE
809 * 1 0 y y (2a) L *->STALE
810 * 1 1 n -- (2a) *->REACHABLE
811 * 1 1 y n (2a) L *->REACHABLE
812 * 1 1 y y (2a) L *->REACHABLE
814 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
816 * If state is REACHABLE, make it STALE.
817 * no other updates should be done.
819 if (ln->ln_state == ND6_LLINFO_REACHABLE)
820 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
822 } else if (is_override /* (2a) */
823 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
824 || lladdr == NULL) { /* (2c) */
826 * Update link-local address, if any.
828 if (lladdr != NULL) {
829 linkhdrsize = sizeof(linkhdr);
830 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
831 linkhdr, &linkhdrsize, &lladdr_off) != 0)
833 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
834 linkhdrsize, lladdr_off) == 0) {
838 EVENTHANDLER_INVOKE(lle_event, ln,
843 * If solicited, make the state REACHABLE.
844 * If not solicited and the link-layer address was
845 * changed, make it STALE.
848 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
850 if (lladdr != NULL && llchange)
851 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
855 if (ln->ln_router && !is_router) {
857 * The peer dropped the router flag.
858 * Remove the sender from the Default Router List and
859 * update the Destination Cache entries.
861 struct ifnet *nd6_ifp;
863 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
864 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
865 (ND_IFINFO(nd6_ifp)->flags &
866 ND6_IFF_ACCEPT_RTADV) != 0)
868 * Even if the neighbor is not in the default
869 * router list, the neighbor may be used as a
870 * next hop for some destinations (e.g. redirect
871 * case). So we must call rt6_flush explicitly.
873 rt6_flush(&ip6->ip6_src, ifp);
875 ln->ln_router = is_router;
879 * rt->rt_flags &= ~RTF_REJECT;
882 if (ln->la_hold != NULL)
883 nd6_grab_holdchain(ln, &chain, &sin6);
889 nd6_flush_holdchain(ifp, ifp, chain, &sin6);
892 pfxlist_onlink_check();
901 ICMP6STAT_INC(icp6s_badna);
906 * Neighbor advertisement output handling.
910 * the following items are not implemented yet:
911 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
912 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
914 * tlladdr - 1 if include target link-layer address
915 * sdl0 - sockaddr_dl (= proxy NA) or NULL
918 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
919 const struct in6_addr *taddr6, u_long flags, int tlladdr,
920 struct sockaddr *sdl0, u_int fibnum)
925 struct nd_neighbor_advert *nd_na;
926 struct ip6_moptions im6o;
927 struct in6_addr daddr6, dst6, src6;
930 int icmp6len, maxlen, error;
933 daddr6 = *daddr6_0; /* make a local copy for modification */
935 /* estimate the size of message */
936 maxlen = sizeof(*ip6) + sizeof(*nd_na);
937 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
938 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
939 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
940 __func__, max_linkhdr, maxlen, MCLBYTES));
942 if (max_linkhdr + maxlen > MHLEN)
943 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
945 m = m_gethdr(M_NOWAIT, MT_DATA);
950 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
951 m->m_flags |= M_MCAST;
952 im6o.im6o_multicast_ifp = ifp;
953 im6o.im6o_multicast_hlim = 255;
954 im6o.im6o_multicast_loop = 0;
957 icmp6len = sizeof(*nd_na);
958 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
959 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
961 /* fill neighbor advertisement packet */
962 ip6 = mtod(m, struct ip6_hdr *);
964 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
965 ip6->ip6_vfc |= IPV6_VERSION;
966 ip6->ip6_nxt = IPPROTO_ICMPV6;
968 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
970 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
971 daddr6.s6_addr16[1] = 0;
972 daddr6.s6_addr32[1] = 0;
973 daddr6.s6_addr32[2] = 0;
974 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
975 if (in6_setscope(&daddr6, ifp, NULL))
978 flags &= ~ND_NA_FLAG_SOLICITED;
980 ip6->ip6_dst = daddr6;
983 * Select a source whose scope is the same as that of the dest.
985 in6_splitscope(&daddr6, &dst6, &scopeid);
986 error = in6_selectsrc_addr(fibnum, &dst6,
987 scopeid, ifp, &src6, NULL);
989 char ip6buf[INET6_ADDRSTRLEN];
990 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
991 "determined: dst=%s, error=%d\n",
992 ip6_sprintf(ip6buf, &daddr6), error));
996 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
997 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
998 nd_na->nd_na_code = 0;
999 nd_na->nd_na_target = *taddr6;
1000 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1003 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1004 * see nd6_ns_input() for details.
1005 * Basically, if NS packet is sent to unicast/anycast addr,
1006 * target lladdr option SHOULD NOT be included.
1010 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1011 * lladdr in sdl0. If we are not proxying (sending NA for
1012 * my address) use lladdr configured for the interface.
1016 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1018 mac = nd6_ifptomac(ifp);
1019 } else if (sdl0->sa_family == AF_LINK) {
1020 struct sockaddr_dl *sdl;
1021 sdl = (struct sockaddr_dl *)sdl0;
1022 if (sdl->sdl_alen == ifp->if_addrlen)
1026 if (tlladdr && mac) {
1027 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1028 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1030 /* roundup to 8 bytes alignment! */
1031 optlen = (optlen + 7) & ~7;
1033 m->m_pkthdr.len += optlen;
1036 bzero((caddr_t)nd_opt, optlen);
1037 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1038 nd_opt->nd_opt_len = optlen >> 3;
1039 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1041 flags &= ~ND_NA_FLAG_OVERRIDE;
1043 ip6->ip6_plen = htons((u_short)icmp6len);
1044 nd_na->nd_na_flags_reserved = flags;
1045 nd_na->nd_na_cksum = 0;
1046 nd_na->nd_na_cksum =
1047 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1049 if (send_sendso_input_hook != NULL) {
1050 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1051 sizeof(unsigned short), M_NOWAIT);
1054 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1055 m_tag_prepend(m, mtag);
1058 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1059 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1060 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1061 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1069 #ifndef BURN_BRIDGES
1071 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1072 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1073 struct sockaddr *sdl0)
1076 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1082 nd6_ifptomac(struct ifnet *ifp)
1084 switch (ifp->if_type) {
1090 case IFT_INFINIBAND:
1093 return IF_LLADDR(ifp);
1100 TAILQ_ENTRY(dadq) dad_list;
1101 struct ifaddr *dad_ifa;
1102 int dad_count; /* max NS to send */
1103 int dad_ns_tcount; /* # of trials to send NS */
1104 int dad_ns_ocount; /* NS sent so far */
1107 int dad_ns_lcount; /* looped back NS */
1108 int dad_loopbackprobe; /* probing state for loopback detection */
1109 struct callout dad_timer_ch;
1110 struct vnet *dad_vnet;
1112 #define ND_OPT_NONCE_LEN32 \
1113 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1114 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1117 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1118 static VNET_DEFINE(struct rwlock, dad_rwlock);
1119 #define V_dadq VNET(dadq)
1120 #define V_dad_rwlock VNET(dad_rwlock)
1122 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1123 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1124 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1125 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1128 nd6_dad_add(struct dadq *dp)
1132 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1137 nd6_dad_del(struct dadq *dp)
1141 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1146 static struct dadq *
1147 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1152 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1153 if (dp->dad_ifa != ifa)
1156 * Skip if the nonce matches the received one.
1157 * +2 in the length is required because of type and
1158 * length fields are included in a header.
1161 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1162 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1163 ND_OPT_NONCE_LEN) == 0) {
1164 dp->dad_ns_lcount++;
1167 refcount_acquire(&dp->dad_refcnt);
1176 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1180 nd6_dad_ns_output(dp);
1181 callout_reset(&dp->dad_timer_ch, ticks,
1182 (void (*)(void *))nd6_dad_timer, (void *)dp);
1186 nd6_dad_stoptimer(struct dadq *dp)
1189 callout_drain(&dp->dad_timer_ch);
1193 nd6_dad_rele(struct dadq *dp)
1196 if (refcount_release(&dp->dad_refcnt)) {
1197 ifa_free(dp->dad_ifa);
1206 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1207 TAILQ_INIT(&V_dadq);
1211 * Start Duplicate Address Detection (DAD) for specified interface address.
1214 nd6_dad_start(struct ifaddr *ifa, int delay)
1216 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1218 char ip6buf[INET6_ADDRSTRLEN];
1220 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1221 ("starting DAD on non-tentative address %p", ifa));
1224 * If we don't need DAD, don't do it.
1225 * There are several cases:
1226 * - DAD is disabled globally or on the interface
1227 * - the interface address is anycast
1229 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1230 V_ip6_dad_count == 0 ||
1231 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1232 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1235 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1236 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1237 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1240 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1242 * DAD is already in progress. Let the existing entry
1249 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1251 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1253 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1254 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1257 callout_init(&dp->dad_timer_ch, 0);
1259 dp->dad_vnet = curvnet;
1261 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1262 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1265 * Send NS packet for DAD, ip6_dad_count times.
1266 * Note that we must delay the first transmission, if this is the
1267 * first packet to be sent from the interface after interface
1268 * (re)initialization.
1271 ifa_ref(dp->dad_ifa);
1272 dp->dad_count = V_ip6_dad_count;
1273 dp->dad_ns_icount = dp->dad_na_icount = 0;
1274 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1275 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1276 refcount_init(&dp->dad_refcnt, 1);
1278 nd6_dad_starttimer(dp, delay, 0);
1282 * terminate DAD unconditionally. used for address removals.
1285 nd6_dad_stop(struct ifaddr *ifa)
1289 dp = nd6_dad_find(ifa, NULL);
1291 /* DAD wasn't started yet */
1295 nd6_dad_stoptimer(dp);
1298 * The DAD queue entry may have been removed by nd6_dad_timer() while
1299 * we were waiting for it to stop, so re-do the lookup.
1302 if (nd6_dad_find(ifa, NULL) == NULL)
1310 nd6_dad_timer(struct dadq *dp)
1312 CURVNET_SET(dp->dad_vnet);
1313 struct ifaddr *ifa = dp->dad_ifa;
1314 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1315 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1316 char ip6buf[INET6_ADDRSTRLEN];
1318 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1320 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1321 /* Do not need DAD for ifdisabled interface. */
1322 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1323 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1326 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1327 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1329 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1330 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1333 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1334 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1336 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1337 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1341 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1342 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1343 (((ifp->if_flags & IFF_UP) == 0) ||
1344 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1345 nd6log((LOG_INFO, "%s: could not run DAD "
1346 "because the interface was down or not running.\n",
1347 if_name(ifa->ifa_ifp)));
1351 /* Need more checks? */
1352 if (dp->dad_ns_ocount < dp->dad_count) {
1354 * We have more NS to go. Send NS packet for DAD.
1356 nd6_dad_starttimer(dp,
1357 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1361 * We have transmitted sufficient number of DAD packets.
1362 * See what we've got.
1364 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1365 /* We've seen NS or NA, means DAD has failed. */
1366 nd6_dad_duplicated(ifa, dp);
1367 else if (V_dad_enhanced != 0 &&
1368 dp->dad_ns_lcount > 0 &&
1369 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1371 * Sec. 4.1 in RFC 7527 requires transmission of
1372 * additional probes until the loopback condition
1373 * becomes clear when a looped back probe is detected.
1375 log(LOG_ERR, "%s: a looped back NS message is "
1376 "detected during DAD for %s. "
1377 "Another DAD probes are being sent.\n",
1378 if_name(ifa->ifa_ifp),
1379 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1380 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1382 * Send an NS immediately and increase dad_count by
1383 * V_nd6_mmaxtries - 1.
1386 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1387 nd6_dad_starttimer(dp,
1388 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1393 * We are done with DAD. No NA came, no NS came.
1394 * No duplicate address found. Check IFDISABLED flag
1395 * again in case that it is changed between the
1396 * beginning of this function and here.
1398 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1399 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1402 "%s: DAD complete for %s - no duplicates found\n",
1403 if_name(ifa->ifa_ifp),
1404 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1405 if (dp->dad_ns_lcount > 0)
1406 log(LOG_ERR, "%s: DAD completed while "
1407 "a looped back NS message is detected "
1408 "during DAD for %s.\n",
1409 if_name(ifa->ifa_ifp),
1410 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1420 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1422 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1424 char ip6buf[INET6_ADDRSTRLEN];
1426 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1427 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1428 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1429 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1432 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1433 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1436 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1437 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1438 log(LOG_ERR, "%s: manual intervention required\n",
1442 * If the address is a link-local address formed from an interface
1443 * identifier based on the hardware address which is supposed to be
1444 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1445 * operation on the interface SHOULD be disabled.
1446 * [RFC 4862, Section 5.4.5]
1448 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1449 struct in6_addr in6;
1452 * To avoid over-reaction, we only apply this logic when we are
1453 * very sure that hardware addresses are supposed to be unique.
1455 switch (ifp->if_type) {
1460 case IFT_INFINIBAND:
1461 in6 = ia->ia_addr.sin6_addr;
1462 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1463 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1464 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1465 log(LOG_ERR, "%s: possible hardware address "
1466 "duplication detected, disable IPv6\n",
1475 nd6_dad_ns_output(struct dadq *dp)
1477 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1478 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1481 dp->dad_ns_tcount++;
1482 if ((ifp->if_flags & IFF_UP) == 0) {
1485 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1489 dp->dad_ns_ocount++;
1490 if (V_dad_enhanced != 0) {
1491 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1492 dp->dad_nonce[i] = arc4random();
1494 * XXXHRS: Note that in the case that
1495 * DupAddrDetectTransmits > 1, multiple NS messages with
1496 * different nonces can be looped back in an unexpected
1497 * order. The current implementation recognizes only
1498 * the latest nonce on the sender side. Practically it
1499 * should work well in almost all cases.
1502 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1503 (uint8_t *)&dp->dad_nonce[0]);
1507 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1509 struct in6_ifaddr *ia;
1511 const struct in6_addr *taddr6;
1515 panic("ifa == NULL in nd6_dad_ns_input");
1517 ia = (struct in6_ifaddr *)ifa;
1519 taddr6 = &ia->ia_addr.sin6_addr;
1520 /* Ignore Nonce option when Enhanced DAD is disabled. */
1521 if (V_dad_enhanced == 0)
1523 dp = nd6_dad_find(ifa, ndopt_nonce);
1527 dp->dad_ns_icount++;
1532 nd6_dad_na_input(struct ifaddr *ifa)
1537 panic("ifa == NULL in nd6_dad_na_input");
1539 dp = nd6_dad_find(ifa, NULL);
1541 dp->dad_na_icount++;