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>
36 #include "opt_inet6.h"
37 #include "opt_ipsec.h"
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/eventhandler.h>
42 #include <sys/malloc.h>
43 #include <sys/libkern.h>
45 #include <sys/rwlock.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
50 #include <sys/kernel.h>
51 #include <sys/errno.h>
52 #include <sys/sysctl.h>
53 #include <sys/syslog.h>
54 #include <sys/queue.h>
55 #include <sys/callout.h>
56 #include <sys/refcount.h>
59 #include <net/if_types.h>
60 #include <net/if_dl.h>
61 #include <net/if_var.h>
62 #include <net/if_private.h>
63 #include <net/route.h>
66 #include <netinet/in.h>
67 #include <netinet/in_var.h>
68 #include <net/if_llatbl.h>
69 #include <netinet6/in6_var.h>
70 #include <netinet6/in6_ifattach.h>
71 #include <netinet/ip6.h>
72 #include <netinet6/ip6_var.h>
73 #include <netinet6/scope6_var.h>
74 #include <netinet6/nd6.h>
75 #include <netinet/icmp6.h>
76 #include <netinet/ip_carp.h>
77 #include <netinet6/send.h>
79 #define SDL(s) ((struct sockaddr_dl *)s)
82 static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
83 static void nd6_dad_add(struct dadq *dp);
84 static void nd6_dad_del(struct dadq *dp);
85 static void nd6_dad_rele(struct dadq *);
86 static void nd6_dad_starttimer(struct dadq *, int);
87 static void nd6_dad_stoptimer(struct dadq *);
88 static void nd6_dad_timer(void *);
89 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
90 static void nd6_dad_ns_output(struct dadq *);
91 static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
92 static void nd6_dad_na_input(struct ifaddr *);
93 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
94 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
95 static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
96 const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
98 static struct ifaddr *nd6_proxy_fill_sdl(struct ifnet *,
99 const struct in6_addr *, struct sockaddr_dl *);
101 VNET_DEFINE_STATIC(int, dad_enhanced) = 1;
102 #define V_dad_enhanced VNET(dad_enhanced)
104 SYSCTL_DECL(_net_inet6_ip6);
105 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
106 &VNET_NAME(dad_enhanced), 0,
107 "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
109 VNET_DEFINE_STATIC(int, dad_maxtry) = 15; /* max # of *tries* to
110 transmit DAD packet */
111 #define V_dad_maxtry VNET(dad_maxtry)
114 * Input a Neighbor Solicitation Message.
117 * Based on RFC 2462 (duplicate address detection)
120 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
124 struct nd_neighbor_solicit *nd_ns;
125 struct in6_addr daddr6, myaddr6, saddr6, taddr6;
127 struct sockaddr_dl proxydl;
128 union nd_opts ndopts;
129 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
131 int anycast, lladdrlen, proxy, rflag, tentative, tlladdr;
135 /* RFC 6980: Nodes MUST silently ignore fragments */
136 if(m->m_flags & M_FRAGMENTED)
139 ifp = m->m_pkthdr.rcvif;
140 ip6 = mtod(m, struct ip6_hdr *);
141 if (__predict_false(ip6->ip6_hlim != 255)) {
142 ICMP6STAT_INC(icp6s_invlhlim);
144 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
145 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
146 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
150 if (m->m_len < off + icmp6len) {
151 m = m_pullup(m, off + icmp6len);
153 IP6STAT_INC(ip6s_exthdrtoolong);
157 ip6 = mtod(m, struct ip6_hdr *);
158 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
160 saddr6 = ip6->ip6_src;
161 daddr6 = ip6->ip6_dst;
162 taddr6 = nd_ns->nd_ns_target;
163 if (in6_setscope(&taddr6, ifp, NULL) != 0)
166 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
167 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
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 */
219 if (ndopts.nd_opts_src_lladdr) {
220 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
221 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
224 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
225 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
226 "(link-layer address option)\n"));
231 * Attaching target link-layer address to the NA?
234 * NS IP dst is unicast/anycast MUST NOT add
235 * NS IP dst is solicited-node multicast MUST add
237 * In implementation, we add target link-layer address by default.
238 * We do not add one in MUST NOT cases.
240 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
246 * Target address (taddr6) must be either:
247 * (1) Valid unicast/anycast address for my receiving interface,
248 * (2) Unicast address for which I'm offering proxy service, or
249 * (3) "tentative" address on which DAD is being performed.
251 /* (1) and (3) check. */
253 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
255 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
260 if ((ifa = nd6_proxy_fill_sdl(ifp, &taddr6, &proxydl)) != NULL)
265 * We've got an NS packet, and we don't have that adddress
266 * assigned for us. We MUST silently ignore it.
271 myaddr6 = *IFA_IN6(ifa);
272 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
273 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
274 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
277 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
278 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
279 "(if %d, NS packet %d)\n",
280 ip6_sprintf(ip6bufs, &taddr6),
281 ifp->if_addrlen, lladdrlen - 2));
285 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
286 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
287 ip6_sprintf(ip6bufs, &saddr6)));
292 * We have neighbor solicitation packet, with target address equals to
293 * one of my tentative address.
295 * src addr how to process?
297 * multicast of course, invalid (rejected in ip6_input)
298 * unicast somebody is doing address resolution -> ignore
299 * unspec dup address detection
301 * The processing is defined in RFC 2462.
305 * If source address is unspecified address, it is for
306 * duplicate address detection.
308 * If not, the packet is for addess resolution;
309 * silently ignore it.
311 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
312 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
318 * If the source address is unspecified address, entries must not
319 * be created or updated.
320 * It looks that sender is performing DAD. Output NA toward
321 * all-node multicast address, to tell the sender that I'm using
323 * S bit ("solicited") must be zero.
325 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
326 struct in6_addr in6_all;
328 in6_all = in6addr_linklocal_allnodes;
329 if (in6_setscope(&in6_all, ifp, NULL) != 0)
331 nd6_na_output_fib(ifp, &in6_all, &taddr6,
332 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
333 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
338 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
339 ND_NEIGHBOR_SOLICIT, 0);
341 nd6_na_output_fib(ifp, &saddr6, &taddr6,
342 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
343 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
344 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
352 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
353 ip6_sprintf(ip6bufs, &saddr6)));
354 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
355 ip6_sprintf(ip6bufs, &daddr6)));
356 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
357 ip6_sprintf(ip6bufs, &taddr6)));
359 ICMP6STAT_INC(icp6s_badns);
365 static struct ifaddr *
366 nd6_proxy_fill_sdl(struct ifnet *ifp, const struct in6_addr *taddr6,
367 struct sockaddr_dl *sdl)
373 ln = nd6_lookup(taddr6, LLE_SF(AF_INET6, 0), ifp);
376 if ((ln->la_flags & (LLE_PUB | LLE_VALID)) == (LLE_PUB | LLE_VALID)) {
377 link_init_sdl(ifp, (struct sockaddr *)sdl, ifp->if_type);
378 sdl->sdl_alen = ifp->if_addrlen;
379 bcopy(ln->ll_addr, &sdl->sdl_data, ifp->if_addrlen);
381 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
382 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
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;
417 if (IN6_IS_ADDR_MULTICAST(taddr6))
420 /* estimate the size of message */
421 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
422 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
423 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
424 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
425 __func__, max_linkhdr, maxlen, MCLBYTES));
427 if (max_linkhdr + maxlen > MHLEN)
428 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
430 m = m_gethdr(M_NOWAIT, MT_DATA);
435 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
436 m->m_flags |= M_MCAST;
437 im6o.im6o_multicast_ifp = ifp;
438 im6o.im6o_multicast_hlim = 255;
439 im6o.im6o_multicast_loop = 0;
442 icmp6len = sizeof(*nd_ns);
443 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
444 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
446 /* fill neighbor solicitation packet */
447 ip6 = mtod(m, struct ip6_hdr *);
449 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
450 ip6->ip6_vfc |= IPV6_VERSION;
451 /* ip6->ip6_plen will be set later */
452 ip6->ip6_nxt = IPPROTO_ICMPV6;
455 ip6->ip6_dst = *daddr6;
457 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
458 ip6->ip6_dst.s6_addr16[1] = 0;
459 ip6->ip6_dst.s6_addr32[1] = 0;
460 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
461 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
462 ip6->ip6_dst.s6_addr8[12] = 0xff;
463 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
467 char ip6buf[INET6_ADDRSTRLEN];
468 struct ifaddr *ifa = NULL;
472 * "If the source address of the packet prompting the
473 * solicitation is the same as one of the addresses assigned
474 * to the outgoing interface, that address SHOULD be placed
475 * in the IP Source Address of the outgoing solicitation.
476 * Otherwise, any one of the addresses assigned to the
477 * interface should be used."
479 * We use the source address for the prompting packet
480 * (saddr6), if saddr6 belongs to the outgoing interface.
481 * Otherwise, we perform the source address selection as usual.
484 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
487 struct in6_addr dst6, src6;
490 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
491 error = in6_selectsrc_addr(fibnum, &dst6,
492 scopeid, ifp, &src6, NULL);
494 nd6log((LOG_DEBUG, "%s: source can't be "
495 "determined: dst=%s, error=%d\n", __func__,
496 ip6_sprintf(ip6buf, &dst6),
502 ip6->ip6_src = *saddr6;
504 if (ifp->if_carp != NULL) {
506 * Check that selected source address belongs to
510 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp,
513 * Do not send NS for CARP address if we are not
516 if (ifa != NULL && ifa->ifa_carp != NULL &&
517 !(*carp_master_p)(ifa)) {
519 "nd6_ns_output: NS from BACKUP CARP address %s\n",
520 ip6_sprintf(ip6buf, &ip6->ip6_src)));
529 * Source address for DAD packet must always be IPv6
530 * unspecified address. (0::0)
531 * We actually don't have to 0-clear the address (we did it
532 * above), but we do so here explicitly to make the intention
535 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
537 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
538 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
539 nd_ns->nd_ns_code = 0;
540 nd_ns->nd_ns_reserved = 0;
541 nd_ns->nd_ns_target = *taddr6;
542 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
545 * Add source link-layer address option.
547 * spec implementation
549 * DAD packet MUST NOT do not add the option
550 * there's no link layer address:
551 * impossible do not add the option
552 * there's link layer address:
553 * Multicast NS MUST add one add the option
554 * Unicast NS SHOULD add one add the option
557 struct nd_opt_hdr *nd_opt;
563 mac = (*carp_macmatch6_p)(ifp, m, &ip6->ip6_src);
565 mac = nd6_ifptomac(ifp);
568 nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
569 optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
570 /* 8 byte alignments... */
571 optlen = (optlen + 7) & ~7;
572 m->m_pkthdr.len += optlen;
575 bzero(nd_opt, optlen);
576 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
577 nd_opt->nd_opt_len = optlen >> 3;
578 bcopy(mac, nd_opt + 1, ifp->if_addrlen);
582 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
583 * This behavior is documented as Enhanced Duplicate Address
584 * Detection in RFC 7527.
585 * net.inet6.ip6.dad_enhanced=0 disables this.
587 if (V_dad_enhanced != 0 && nonce != NULL) {
588 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
589 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
590 /* 8-byte alignment is required. */
591 optlen = (optlen + 7) & ~7;
593 m->m_pkthdr.len += optlen;
596 bzero((caddr_t)nd_opt, optlen);
597 nd_opt->nd_opt_type = ND_OPT_NONCE;
598 nd_opt->nd_opt_len = optlen >> 3;
599 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
601 ip6->ip6_plen = htons((u_short)icmp6len);
602 nd_ns->nd_ns_cksum = 0;
604 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
606 if (send_sendso_input_hook != NULL) {
607 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
608 sizeof(unsigned short), M_NOWAIT);
611 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
612 m_tag_prepend(m, mtag);
615 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
617 icmp6_ifstat_inc(ifp, ifs6_out_msg);
618 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
619 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
629 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
630 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
633 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
637 * Neighbor advertisement input handling.
640 * Based on RFC 2462 (duplicate address detection)
642 * the following items are not implemented yet:
643 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
644 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
647 nd6_na_input(struct mbuf *m, int off, int icmp6len)
654 struct nd_neighbor_advert *nd_na;
655 struct in6_addr daddr6, taddr6;
656 union nd_opts ndopts;
657 u_char linkhdr[LLE_MAX_LINKHDR];
658 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
661 int flags, is_override, is_router, is_solicited;
662 int lladdr_off, lladdrlen, checklink;
663 bool flush_holdchain = false;
671 /* RFC 6980: Nodes MUST silently ignore fragments */
672 if(m->m_flags & M_FRAGMENTED)
675 ifp = m->m_pkthdr.rcvif;
676 ip6 = mtod(m, struct ip6_hdr *);
677 if (__predict_false(ip6->ip6_hlim != 255)) {
678 ICMP6STAT_INC(icp6s_invlhlim);
680 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
681 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
682 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
686 if (m->m_len < off + icmp6len) {
687 m = m_pullup(m, off + icmp6len);
689 IP6STAT_INC(ip6s_exthdrtoolong);
693 ip6 = mtod(m, struct ip6_hdr *);
694 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
696 flags = nd_na->nd_na_flags_reserved;
697 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
698 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
699 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
701 taddr6 = nd_na->nd_na_target;
702 if (in6_setscope(&taddr6, ifp, NULL))
703 goto bad; /* XXX: impossible */
705 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
707 "nd6_na_input: invalid target address %s\n",
708 ip6_sprintf(ip6bufs, &taddr6)));
712 daddr6 = ip6->ip6_dst;
713 if (IN6_IS_ADDR_MULTICAST(&daddr6))
716 "nd6_na_input: a solicited adv is multicasted\n"));
720 icmp6len -= sizeof(*nd_na);
721 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
722 if (nd6_options(&ndopts) < 0) {
724 "nd6_na_input: invalid ND option, ignored\n"));
725 /* nd6_options have incremented stats */
731 if (ndopts.nd_opts_tgt_lladdr) {
732 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
733 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
736 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
737 if (ifa != NULL && ifa->ifa_carp != NULL) {
739 * Silently ignore NAs for CARP addresses if we are not
742 if (!(*carp_master_p)(ifa)) {
744 "nd6_na_input: NA for BACKUP CARP address %s\n",
745 ip6_sprintf(ip6bufs, &taddr6)));
751 * Target address matches one of my interface address.
753 * If my address is tentative, this means that there's somebody
754 * already using the same address as mine. This indicates DAD failure.
755 * This is defined in RFC 2462.
757 * Otherwise, process as defined in RFC 2461.
760 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
761 nd6_dad_na_input(ifa);
766 /* Just for safety, maybe unnecessary. */
770 "nd6_na_input: duplicate IP6 address %s\n",
771 ip6_sprintf(ip6bufs, &taddr6));
775 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
776 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
777 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
778 ifp->if_addrlen, lladdrlen - 2));
783 * If no neighbor cache entry is found, NA SHOULD silently be
786 ln = nd6_lookup(&taddr6, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
792 * Do not try to override static entry.
794 if (ln->la_flags & LLE_STATIC)
797 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
799 * If the link-layer has address, and no lladdr option came,
800 * discard the packet.
802 if (ifp->if_addrlen && lladdr == NULL) {
807 * Record link-layer address, and update the state.
809 if (!nd6_try_set_entry_addr(ifp, ln, lladdr))
812 flush_holdchain = true;
814 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
816 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
817 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
818 if ((ln->ln_router = is_router) != 0) {
820 * This means a router's state has changed from
821 * non-reachable to probably reachable, and might
822 * affect the status of associated prefixes..
830 * Check if the link-layer address has changed or not.
835 if (ln->la_flags & LLE_VALID) {
836 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
845 * This is VERY complex. Look at it with care.
847 * override solicit lladdr llchange action
852 * 0 0 y y (1) REACHABLE->STALE
853 * 0 1 n -- (2c) *->REACHABLE
854 * 0 1 y n (2b) L *->REACHABLE
855 * 0 1 y y (1) REACHABLE->STALE
858 * 1 0 y y (2a) L *->STALE
859 * 1 1 n -- (2a) *->REACHABLE
860 * 1 1 y n (2a) L *->REACHABLE
861 * 1 1 y y (2a) L *->REACHABLE
863 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
865 * If state is REACHABLE, make it STALE.
866 * no other updates should be done.
868 if (ln->ln_state == ND6_LLINFO_REACHABLE)
869 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
871 } else if (is_override /* (2a) */
872 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
873 || lladdr == NULL) { /* (2c) */
875 * Update link-local address, if any.
877 if (lladdr != NULL) {
878 linkhdrsize = sizeof(linkhdr);
879 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
880 linkhdr, &linkhdrsize, &lladdr_off) != 0)
882 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
883 linkhdrsize, lladdr_off) == 0)
885 EVENTHANDLER_INVOKE(lle_event, ln,
890 * If solicited, make the state REACHABLE.
891 * If not solicited and the link-layer address was
892 * changed, make it STALE.
895 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
897 if (lladdr != NULL && llchange)
898 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
902 if (ln->ln_router && !is_router) {
904 * The peer dropped the router flag.
905 * Remove the sender from the Default Router List and
906 * update the Destination Cache entries.
908 struct ifnet *nd6_ifp;
910 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
911 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
912 (ND_IFINFO(nd6_ifp)->flags &
913 ND6_IFF_ACCEPT_RTADV) != 0)
915 * Even if the neighbor is not in the default
916 * router list, the neighbor may be used as a
917 * next hop for some destinations (e.g. redirect
918 * case). So we must call rt6_flush explicitly.
920 rt6_flush(&ip6->ip6_src, ifp);
922 ln->ln_router = is_router;
926 * rt->rt_flags &= ~RTF_REJECT;
929 if (ln->la_hold != NULL)
930 chain = nd6_grab_holdchain(ln);
936 nd6_flush_holdchain(ifp, ln, chain);
938 nd6_flush_children_holdchain(ifp, ln);
941 pfxlist_onlink_check();
950 ICMP6STAT_INC(icp6s_badna);
955 * Neighbor advertisement output handling.
959 * the following items are not implemented yet:
960 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
961 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
963 * tlladdr - 1 if include target link-layer address
964 * sdl0 - sockaddr_dl (= proxy NA) or NULL
967 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
968 const struct in6_addr *taddr6, u_long flags, int tlladdr,
969 struct sockaddr *sdl0, u_int fibnum)
974 struct nd_neighbor_advert *nd_na;
975 struct ip6_moptions im6o;
976 struct in6_addr daddr6, dst6, src6;
981 int icmp6len, maxlen, error;
984 daddr6 = *daddr6_0; /* make a local copy for modification */
986 /* estimate the size of message */
987 maxlen = sizeof(*ip6) + sizeof(*nd_na);
988 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
989 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
990 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
991 __func__, max_linkhdr, maxlen, MCLBYTES));
993 if (max_linkhdr + maxlen > MHLEN)
994 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
996 m = m_gethdr(M_NOWAIT, MT_DATA);
1001 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
1002 m->m_flags |= M_MCAST;
1003 im6o.im6o_multicast_ifp = ifp;
1004 im6o.im6o_multicast_hlim = 255;
1005 im6o.im6o_multicast_loop = 0;
1008 icmp6len = sizeof(*nd_na);
1009 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
1010 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
1012 /* fill neighbor advertisement packet */
1013 ip6 = mtod(m, struct ip6_hdr *);
1015 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
1016 ip6->ip6_vfc |= IPV6_VERSION;
1017 ip6->ip6_nxt = IPPROTO_ICMPV6;
1018 ip6->ip6_hlim = 255;
1019 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
1021 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
1022 daddr6.s6_addr16[1] = 0;
1023 daddr6.s6_addr32[1] = 0;
1024 daddr6.s6_addr32[2] = 0;
1025 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1026 if (in6_setscope(&daddr6, ifp, NULL))
1029 flags &= ~ND_NA_FLAG_SOLICITED;
1031 ip6->ip6_dst = daddr6;
1034 * Select a source whose scope is the same as that of the dest.
1036 in6_splitscope(&daddr6, &dst6, &scopeid);
1037 error = in6_selectsrc_addr(fibnum, &dst6,
1038 scopeid, ifp, &src6, NULL);
1040 char ip6buf[INET6_ADDRSTRLEN];
1041 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1042 "determined: dst=%s, error=%d\n",
1043 ip6_sprintf(ip6buf, &daddr6), error));
1046 ip6->ip6_src = src6;
1047 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1048 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1049 nd_na->nd_na_code = 0;
1050 nd_na->nd_na_target = *taddr6;
1051 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1054 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1055 * see nd6_ns_input() for details.
1056 * Basically, if NS packet is sent to unicast/anycast addr,
1057 * target lladdr option SHOULD NOT be included.
1061 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1062 * lladdr in sdl0. If we are not proxying (sending NA for
1063 * my address) use lladdr configured for the interface.
1067 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1069 mac = nd6_ifptomac(ifp);
1070 } else if (sdl0->sa_family == AF_LINK) {
1071 struct sockaddr_dl *sdl;
1072 sdl = (struct sockaddr_dl *)sdl0;
1073 if (sdl->sdl_alen == ifp->if_addrlen)
1077 if (tlladdr && mac) {
1078 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1079 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1081 /* roundup to 8 bytes alignment! */
1082 optlen = (optlen + 7) & ~7;
1084 m->m_pkthdr.len += optlen;
1087 bzero((caddr_t)nd_opt, optlen);
1088 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1089 nd_opt->nd_opt_len = optlen >> 3;
1090 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1092 flags &= ~ND_NA_FLAG_OVERRIDE;
1094 ip6->ip6_plen = htons((u_short)icmp6len);
1095 nd_na->nd_na_flags_reserved = flags;
1096 nd_na->nd_na_cksum = 0;
1097 nd_na->nd_na_cksum =
1098 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1100 if (send_sendso_input_hook != NULL) {
1101 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1102 sizeof(unsigned short), M_NOWAIT);
1105 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1106 m_tag_prepend(m, mtag);
1109 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1110 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1111 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1112 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1120 #ifndef BURN_BRIDGES
1122 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1123 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1124 struct sockaddr *sdl0)
1127 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1133 nd6_ifptomac(struct ifnet *ifp)
1135 switch (ifp->if_type) {
1139 case IFT_INFINIBAND:
1141 return IF_LLADDR(ifp);
1148 TAILQ_ENTRY(dadq) dad_list;
1149 struct ifaddr *dad_ifa;
1150 int dad_count; /* max NS to send */
1151 int dad_ns_tcount; /* # of trials to send NS */
1152 int dad_ns_ocount; /* NS sent so far */
1155 int dad_ns_lcount; /* looped back NS */
1156 int dad_loopbackprobe; /* probing state for loopback detection */
1157 struct callout dad_timer_ch;
1158 struct vnet *dad_vnet;
1160 #define ND_OPT_NONCE_LEN32 \
1161 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1162 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1163 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1166 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1167 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1168 #define V_dadq VNET(dadq)
1169 #define V_dad_rwlock VNET(dad_rwlock)
1171 #define DADQ_LOCKPTR() (&V_dad_rwlock)
1172 #define DADQ_LOCK_INIT() rw_init(DADQ_LOCKPTR(), "nd6 DAD queue")
1173 #define DADQ_RLOCK() rw_rlock(DADQ_LOCKPTR())
1174 #define DADQ_RUNLOCK() rw_runlock(DADQ_LOCKPTR())
1175 #define DADQ_WLOCK() rw_wlock(DADQ_LOCKPTR())
1176 #define DADQ_WUNLOCK() rw_wunlock(DADQ_LOCKPTR())
1178 #define DADQ_LOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_LOCKED);
1179 #define DADQ_RLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_RLOCKED);
1180 #define DADQ_WLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_WLOCKED);
1183 nd6_dad_add(struct dadq *dp)
1185 DADQ_WLOCK_ASSERT();
1187 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1188 dp->dad_ondadq = true;
1192 nd6_dad_del(struct dadq *dp)
1194 DADQ_WLOCK_ASSERT();
1196 if (dp->dad_ondadq) {
1198 * Remove dp from the dadq and release the dadq's
1201 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1202 dp->dad_ondadq = false;
1207 static struct dadq *
1208 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1214 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1215 if (dp->dad_ifa != ifa)
1219 * Skip if the nonce matches the received one.
1220 * +2 in the length is required because of type and
1221 * length fields are included in a header.
1224 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1225 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1226 ND_OPT_NONCE_LEN) == 0) {
1227 dp->dad_ns_lcount++;
1237 nd6_dad_starttimer(struct dadq *dp, int ticks)
1239 DADQ_WLOCK_ASSERT();
1241 callout_reset(&dp->dad_timer_ch, ticks, nd6_dad_timer, dp);
1245 nd6_dad_stoptimer(struct dadq *dp)
1247 callout_drain(&dp->dad_timer_ch);
1251 nd6_dad_rele(struct dadq *dp)
1253 if (refcount_release(&dp->dad_refcnt)) {
1254 KASSERT(!dp->dad_ondadq, ("dp %p still on DAD queue", dp));
1255 ifa_free(dp->dad_ifa);
1264 TAILQ_INIT(&V_dadq);
1268 * Start Duplicate Address Detection (DAD) for specified interface address.
1271 nd6_dad_start(struct ifaddr *ifa, int delay)
1273 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1275 char ip6buf[INET6_ADDRSTRLEN];
1277 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1278 ("starting DAD on non-tentative address %p", ifa));
1281 * If we don't need DAD, don't do it.
1282 * There are several cases:
1283 * - DAD is disabled globally or on the interface
1284 * - the interface address is anycast
1286 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1287 V_ip6_dad_count == 0 ||
1288 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1289 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1292 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1293 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1294 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1298 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1300 * DAD is already in progress. Let the existing entry
1307 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1309 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1311 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1312 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1315 callout_init_rw(&dp->dad_timer_ch, DADQ_LOCKPTR(),
1316 CALLOUT_RETURNUNLOCKED);
1318 dp->dad_vnet = curvnet;
1320 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1321 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1324 * Send NS packet for DAD, ip6_dad_count times.
1325 * Note that we must delay the first transmission, if this is the
1326 * first packet to be sent from the interface after interface
1327 * (re)initialization.
1330 ifa_ref(dp->dad_ifa);
1331 dp->dad_count = V_ip6_dad_count;
1332 dp->dad_ns_icount = dp->dad_na_icount = 0;
1333 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1334 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1336 /* Add this to the dadq and add a reference for the dadq. */
1337 refcount_init(&dp->dad_refcnt, 1);
1339 nd6_dad_starttimer(dp, delay);
1344 * terminate DAD unconditionally. used for address removals.
1347 nd6_dad_stop(struct ifaddr *ifa)
1352 dp = nd6_dad_find(ifa, NULL);
1355 /* DAD wasn't started yet */
1360 * Acquire a temporary reference so that we can safely stop the callout.
1362 (void)refcount_acquire(&dp->dad_refcnt);
1366 nd6_dad_stoptimer(dp);
1371 nd6_dad_timer(void *arg)
1373 struct dadq *dp = arg;
1374 struct ifaddr *ifa = dp->dad_ifa;
1375 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1376 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1377 char ip6buf[INET6_ADDRSTRLEN];
1378 struct epoch_tracker et;
1380 CURVNET_SET(dp->dad_vnet);
1381 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1383 NET_EPOCH_ENTER(et);
1384 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1385 /* Do not need DAD for ifdisabled interface. */
1386 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1387 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1390 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1391 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1393 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1394 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1397 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1398 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1400 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1401 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1405 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1406 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1407 (((ifp->if_flags & IFF_UP) == 0) ||
1408 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1409 nd6log((LOG_INFO, "%s: could not run DAD "
1410 "because the interface was down or not running.\n",
1411 if_name(ifa->ifa_ifp)));
1415 /* Need more checks? */
1416 if (dp->dad_ns_ocount < dp->dad_count) {
1418 * We have more NS to go. Send NS packet for DAD.
1420 nd6_dad_starttimer(dp,
1421 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1422 nd6_dad_ns_output(dp);
1426 * We have transmitted sufficient number of DAD packets.
1427 * See what we've got.
1429 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0) {
1430 /* We've seen NS or NA, means DAD has failed. */
1431 nd6_dad_duplicated(ifa, dp);
1432 } else if (V_dad_enhanced != 0 &&
1433 dp->dad_ns_lcount > 0 &&
1434 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1436 * Sec. 4.1 in RFC 7527 requires transmission of
1437 * additional probes until the loopback condition
1438 * becomes clear when a looped back probe is detected.
1440 log(LOG_ERR, "%s: a looped back NS message is "
1441 "detected during DAD for %s. "
1442 "Another DAD probes are being sent.\n",
1443 if_name(ifa->ifa_ifp),
1444 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1445 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1447 * Send an NS immediately and increase dad_count by
1448 * V_nd6_mmaxtries - 1.
1451 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1452 nd6_dad_starttimer(dp,
1453 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1454 nd6_dad_ns_output(dp);
1458 * We are done with DAD. No NA came, no NS came.
1459 * No duplicate address found. Check IFDISABLED flag
1460 * again in case that it is changed between the
1461 * beginning of this function and here.
1463 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1464 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1467 "%s: DAD complete for %s - no duplicates found\n",
1468 if_name(ifa->ifa_ifp),
1469 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1470 if (dp->dad_ns_lcount > 0)
1471 log(LOG_ERR, "%s: DAD completed while "
1472 "a looped back NS message is detected "
1473 "during DAD for %s.\n",
1474 if_name(ifa->ifa_ifp),
1475 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1487 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1489 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1491 char ip6buf[INET6_ADDRSTRLEN];
1493 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1494 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1495 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1496 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1499 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1500 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1503 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1504 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1505 log(LOG_ERR, "%s: manual intervention required\n",
1509 * If the address is a link-local address formed from an interface
1510 * identifier based on the hardware address which is supposed to be
1511 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1512 * operation on the interface SHOULD be disabled.
1513 * [RFC 4862, Section 5.4.5]
1515 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1516 struct in6_addr in6;
1519 * To avoid over-reaction, we only apply this logic when we are
1520 * very sure that hardware addresses are supposed to be unique.
1522 switch (ifp->if_type) {
1526 case IFT_INFINIBAND:
1527 in6 = ia->ia_addr.sin6_addr;
1528 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1529 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1530 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1531 log(LOG_ERR, "%s: possible hardware address "
1532 "duplication detected, disable IPv6\n",
1541 * Transmit a neighbour solicitation for the purpose of DAD. Returns with the
1542 * DAD queue unlocked.
1545 nd6_dad_ns_output(struct dadq *dp)
1547 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1548 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1551 DADQ_WLOCK_ASSERT();
1553 dp->dad_ns_tcount++;
1554 if ((ifp->if_flags & IFF_UP) == 0) {
1558 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1563 dp->dad_ns_ocount++;
1564 if (V_dad_enhanced != 0) {
1565 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1566 dp->dad_nonce[i] = arc4random();
1568 * XXXHRS: Note that in the case that
1569 * DupAddrDetectTransmits > 1, multiple NS messages with
1570 * different nonces can be looped back in an unexpected
1571 * order. The current implementation recognizes only
1572 * the latest nonce on the sender side. Practically it
1573 * should work well in almost all cases.
1577 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1578 (uint8_t *)&dp->dad_nonce[0]);
1582 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1587 panic("ifa == NULL in nd6_dad_ns_input");
1589 /* Ignore Nonce option when Enhanced DAD is disabled. */
1590 if (V_dad_enhanced == 0)
1593 dp = nd6_dad_find(ifa, ndopt_nonce);
1595 dp->dad_ns_icount++;
1600 nd6_dad_na_input(struct ifaddr *ifa)
1605 panic("ifa == NULL in nd6_dad_na_input");
1608 dp = nd6_dad_find(ifa, NULL);
1610 dp->dad_na_icount++;