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"
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/eventhandler.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>
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <net/if_llatbl.h>
70 #include <netinet6/in6_var.h>
71 #include <netinet6/in6_ifattach.h>
72 #include <netinet/ip6.h>
73 #include <netinet6/ip6_var.h>
74 #include <netinet6/scope6_var.h>
75 #include <netinet6/nd6.h>
76 #include <netinet/icmp6.h>
77 #include <netinet/ip_carp.h>
78 #include <netinet6/send.h>
80 #define SDL(s) ((struct sockaddr_dl *)s)
83 static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
84 static void nd6_dad_add(struct dadq *dp);
85 static void nd6_dad_del(struct dadq *dp);
86 static void nd6_dad_rele(struct dadq *);
87 static void nd6_dad_starttimer(struct dadq *, int);
88 static void nd6_dad_stoptimer(struct dadq *);
89 static void nd6_dad_timer(void *);
90 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
91 static void nd6_dad_ns_output(struct dadq *);
92 static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
93 static void nd6_dad_na_input(struct ifaddr *);
94 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
95 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
96 static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
97 const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
99 static struct ifaddr *nd6_proxy_fill_sdl(struct ifnet *,
100 const struct in6_addr *, struct sockaddr_dl *);
102 VNET_DEFINE_STATIC(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 VNET_DEFINE_STATIC(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)
125 struct nd_neighbor_solicit *nd_ns;
126 struct in6_addr daddr6, myaddr6, saddr6, taddr6;
128 struct sockaddr_dl proxydl;
129 union nd_opts ndopts;
130 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
132 int anycast, lladdrlen, proxy, rflag, tentative, tlladdr;
136 /* RFC 6980: Nodes MUST silently ignore fragments */
137 if(m->m_flags & M_FRAGMENTED)
140 ifp = m->m_pkthdr.rcvif;
141 ip6 = mtod(m, struct ip6_hdr *);
142 if (__predict_false(ip6->ip6_hlim != 255)) {
143 ICMP6STAT_INC(icp6s_invlhlim);
145 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
146 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
147 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
151 if (m->m_len < off + icmp6len) {
152 m = m_pullup(m, off + icmp6len);
154 IP6STAT_INC(ip6s_exthdrtoolong);
158 ip6 = mtod(m, struct ip6_hdr *);
159 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
161 saddr6 = ip6->ip6_src;
162 daddr6 = ip6->ip6_dst;
163 taddr6 = nd_ns->nd_ns_target;
164 if (in6_setscope(&taddr6, ifp, NULL) != 0)
167 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
168 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
171 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
172 /* dst has to be a solicited node multicast address. */
173 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
174 /* don't check ifindex portion */
175 daddr6.s6_addr32[1] == 0 &&
176 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
177 daddr6.s6_addr8[12] == 0xff) {
180 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
181 "(wrong ip6 dst)\n"));
184 } else if (!V_nd6_onlink_ns_rfc4861) {
185 struct sockaddr_in6 src_sa6;
188 * According to recent IETF discussions, it is not a good idea
189 * to accept a NS from an address which would not be deemed
190 * to be a neighbor otherwise. This point is expected to be
191 * clarified in future revisions of the specification.
193 bzero(&src_sa6, sizeof(src_sa6));
194 src_sa6.sin6_family = AF_INET6;
195 src_sa6.sin6_len = sizeof(src_sa6);
196 src_sa6.sin6_addr = saddr6;
197 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
198 nd6log((LOG_INFO, "nd6_ns_input: "
199 "NS packet from non-neighbor\n"));
204 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
205 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
209 icmp6len -= sizeof(*nd_ns);
210 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
211 if (nd6_options(&ndopts) < 0) {
213 "nd6_ns_input: invalid ND option, ignored\n"));
214 /* nd6_options have incremented stats */
220 if (ndopts.nd_opts_src_lladdr) {
221 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
222 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
225 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
226 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
227 "(link-layer address option)\n"));
232 * Attaching target link-layer address to the NA?
235 * NS IP dst is unicast/anycast MUST NOT add
236 * NS IP dst is solicited-node multicast MUST add
238 * In implementation, we add target link-layer address by default.
239 * We do not add one in MUST NOT cases.
241 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
247 * Target address (taddr6) must be either:
248 * (1) Valid unicast/anycast address for my receiving interface,
249 * (2) Unicast address for which I'm offering proxy service, or
250 * (3) "tentative" address on which DAD is being performed.
252 /* (1) and (3) check. */
254 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
256 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
261 if ((ifa = nd6_proxy_fill_sdl(ifp, &taddr6, &proxydl)) != NULL)
266 * We've got an NS packet, and we don't have that adddress
267 * assigned for us. We MUST silently ignore it.
272 myaddr6 = *IFA_IN6(ifa);
273 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
274 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
275 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
278 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
279 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
280 "(if %d, NS packet %d)\n",
281 ip6_sprintf(ip6bufs, &taddr6),
282 ifp->if_addrlen, lladdrlen - 2));
286 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
287 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
288 ip6_sprintf(ip6bufs, &saddr6)));
293 * We have neighbor solicitation packet, with target address equals to
294 * one of my tentative address.
296 * src addr how to process?
298 * multicast of course, invalid (rejected in ip6_input)
299 * unicast somebody is doing address resolution -> ignore
300 * unspec dup address detection
302 * The processing is defined in RFC 2462.
306 * If source address is unspecified address, it is for
307 * duplicate address detection.
309 * If not, the packet is for addess resolution;
310 * silently ignore it.
312 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
313 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
319 * If the source address is unspecified address, entries must not
320 * be created or updated.
321 * It looks that sender is performing DAD. Output NA toward
322 * all-node multicast address, to tell the sender that I'm using
324 * S bit ("solicited") must be zero.
326 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
327 struct in6_addr in6_all;
329 in6_all = in6addr_linklocal_allnodes;
330 if (in6_setscope(&in6_all, ifp, NULL) != 0)
332 nd6_na_output_fib(ifp, &in6_all, &taddr6,
333 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
334 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
339 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
340 ND_NEIGHBOR_SOLICIT, 0);
342 nd6_na_output_fib(ifp, &saddr6, &taddr6,
343 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
344 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
345 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
353 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
354 ip6_sprintf(ip6bufs, &saddr6)));
355 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
356 ip6_sprintf(ip6bufs, &daddr6)));
357 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
358 ip6_sprintf(ip6bufs, &taddr6)));
360 ICMP6STAT_INC(icp6s_badns);
366 static struct ifaddr *
367 nd6_proxy_fill_sdl(struct ifnet *ifp, const struct in6_addr *taddr6,
368 struct sockaddr_dl *sdl)
374 ln = nd6_lookup(taddr6, LLE_SF(AF_INET6, 0), ifp);
377 if ((ln->la_flags & (LLE_PUB | LLE_VALID)) == (LLE_PUB | LLE_VALID)) {
378 link_init_sdl(ifp, (struct sockaddr *)sdl, ifp->if_type);
379 sdl->sdl_alen = ifp->if_addrlen;
380 bcopy(ln->ll_addr, &sdl->sdl_data, ifp->if_addrlen);
382 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
383 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
391 * Output a Neighbor Solicitation Message. Caller specifies:
392 * - ICMP6 header source IP6 address
393 * - ND6 header target IP6 address
394 * - ND6 header source datalink address
397 * Based on RFC 2462 (duplicate address detection)
399 * ln - for source address determination
400 * nonce - If non-NULL, NS is used for duplicate address detection and
401 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
404 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
405 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
406 uint8_t *nonce, u_int fibnum)
411 struct nd_neighbor_solicit *nd_ns;
412 struct ip6_moptions im6o;
418 if (IN6_IS_ADDR_MULTICAST(taddr6))
421 /* estimate the size of message */
422 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
423 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
424 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
425 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
426 __func__, max_linkhdr, maxlen, MCLBYTES));
428 if (max_linkhdr + maxlen > MHLEN)
429 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
431 m = m_gethdr(M_NOWAIT, MT_DATA);
436 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
437 m->m_flags |= M_MCAST;
438 im6o.im6o_multicast_ifp = ifp;
439 im6o.im6o_multicast_hlim = 255;
440 im6o.im6o_multicast_loop = 0;
443 icmp6len = sizeof(*nd_ns);
444 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
445 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
447 /* fill neighbor solicitation packet */
448 ip6 = mtod(m, struct ip6_hdr *);
450 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
451 ip6->ip6_vfc |= IPV6_VERSION;
452 /* ip6->ip6_plen will be set later */
453 ip6->ip6_nxt = IPPROTO_ICMPV6;
456 ip6->ip6_dst = *daddr6;
458 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
459 ip6->ip6_dst.s6_addr16[1] = 0;
460 ip6->ip6_dst.s6_addr32[1] = 0;
461 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
462 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
463 ip6->ip6_dst.s6_addr8[12] = 0xff;
464 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
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.
485 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
487 /* ip6_src set already. */
488 ip6->ip6_src = *saddr6;
492 struct in6_addr dst6, src6;
495 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
496 error = in6_selectsrc_addr(fibnum, &dst6,
497 scopeid, ifp, &src6, NULL);
499 char ip6buf[INET6_ADDRSTRLEN];
500 nd6log((LOG_DEBUG, "%s: source can't be "
501 "determined: dst=%s, error=%d\n", __func__,
502 ip6_sprintf(ip6buf, &dst6),
510 * Source address for DAD packet must always be IPv6
511 * unspecified address. (0::0)
512 * We actually don't have to 0-clear the address (we did it
513 * above), but we do so here explicitly to make the intention
516 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
518 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
519 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
520 nd_ns->nd_ns_code = 0;
521 nd_ns->nd_ns_reserved = 0;
522 nd_ns->nd_ns_target = *taddr6;
523 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
526 * Add source link-layer address option.
528 * spec implementation
530 * DAD packet MUST NOT do not add the option
531 * there's no link layer address:
532 * impossible do not add the option
533 * there's link layer address:
534 * Multicast NS MUST add one add the option
535 * Unicast NS SHOULD add one add the option
538 struct nd_opt_hdr *nd_opt;
544 mac = (*carp_macmatch6_p)(ifp, m, &ip6->ip6_src);
546 mac = nd6_ifptomac(ifp);
549 nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
550 optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
551 /* 8 byte alignments... */
552 optlen = (optlen + 7) & ~7;
553 m->m_pkthdr.len += optlen;
556 bzero(nd_opt, optlen);
557 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
558 nd_opt->nd_opt_len = optlen >> 3;
559 bcopy(mac, nd_opt + 1, ifp->if_addrlen);
563 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
564 * This behavior is documented as Enhanced Duplicate Address
565 * Detection in RFC 7527.
566 * net.inet6.ip6.dad_enhanced=0 disables this.
568 if (V_dad_enhanced != 0 && nonce != NULL) {
569 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
570 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
571 /* 8-byte alignment is required. */
572 optlen = (optlen + 7) & ~7;
574 m->m_pkthdr.len += optlen;
577 bzero((caddr_t)nd_opt, optlen);
578 nd_opt->nd_opt_type = ND_OPT_NONCE;
579 nd_opt->nd_opt_len = optlen >> 3;
580 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
582 ip6->ip6_plen = htons((u_short)icmp6len);
583 nd_ns->nd_ns_cksum = 0;
585 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
587 if (send_sendso_input_hook != NULL) {
588 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
589 sizeof(unsigned short), M_NOWAIT);
592 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
593 m_tag_prepend(m, mtag);
596 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
598 icmp6_ifstat_inc(ifp, ifs6_out_msg);
599 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
600 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
610 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
611 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
614 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
618 * Neighbor advertisement input handling.
621 * Based on RFC 2462 (duplicate address detection)
623 * the following items are not implemented yet:
624 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
625 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
628 nd6_na_input(struct mbuf *m, int off, int icmp6len)
635 struct nd_neighbor_advert *nd_na;
636 struct in6_addr daddr6, taddr6;
637 union nd_opts ndopts;
638 u_char linkhdr[LLE_MAX_LINKHDR];
639 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
642 int flags, is_override, is_router, is_solicited;
643 int lladdr_off, lladdrlen, checklink;
644 bool flush_holdchain = false;
652 /* RFC 6980: Nodes MUST silently ignore fragments */
653 if(m->m_flags & M_FRAGMENTED)
656 ifp = m->m_pkthdr.rcvif;
657 ip6 = mtod(m, struct ip6_hdr *);
658 if (__predict_false(ip6->ip6_hlim != 255)) {
659 ICMP6STAT_INC(icp6s_invlhlim);
661 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
662 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
663 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
667 if (m->m_len < off + icmp6len) {
668 m = m_pullup(m, off + icmp6len);
670 IP6STAT_INC(ip6s_exthdrtoolong);
674 ip6 = mtod(m, struct ip6_hdr *);
675 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
677 flags = nd_na->nd_na_flags_reserved;
678 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
679 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
680 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
682 taddr6 = nd_na->nd_na_target;
683 if (in6_setscope(&taddr6, ifp, NULL))
684 goto bad; /* XXX: impossible */
686 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
688 "nd6_na_input: invalid target address %s\n",
689 ip6_sprintf(ip6bufs, &taddr6)));
693 daddr6 = ip6->ip6_dst;
694 if (IN6_IS_ADDR_MULTICAST(&daddr6))
697 "nd6_na_input: a solicited adv is multicasted\n"));
701 icmp6len -= sizeof(*nd_na);
702 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
703 if (nd6_options(&ndopts) < 0) {
705 "nd6_na_input: invalid ND option, ignored\n"));
706 /* nd6_options have incremented stats */
712 if (ndopts.nd_opts_tgt_lladdr) {
713 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
714 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
718 * This effectively disables the DAD check on a non-master CARP
722 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
724 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
727 * Target address matches one of my interface address.
729 * If my address is tentative, this means that there's somebody
730 * already using the same address as mine. This indicates DAD failure.
731 * This is defined in RFC 2462.
733 * Otherwise, process as defined in RFC 2461.
736 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
737 nd6_dad_na_input(ifa);
742 /* Just for safety, maybe unnecessary. */
746 "nd6_na_input: duplicate IP6 address %s\n",
747 ip6_sprintf(ip6bufs, &taddr6));
751 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
752 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
753 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
754 ifp->if_addrlen, lladdrlen - 2));
759 * If no neighbor cache entry is found, NA SHOULD silently be
762 ln = nd6_lookup(&taddr6, LLE_SF(AF_INET6, LLE_EXCLUSIVE), ifp);
768 * Do not try to override static entry.
770 if (ln->la_flags & LLE_STATIC)
773 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
775 * If the link-layer has address, and no lladdr option came,
776 * discard the packet.
778 if (ifp->if_addrlen && lladdr == NULL) {
783 * Record link-layer address, and update the state.
785 if (!nd6_try_set_entry_addr(ifp, ln, lladdr))
788 flush_holdchain = true;
789 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
791 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
793 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
794 if ((ln->ln_router = is_router) != 0) {
796 * This means a router's state has changed from
797 * non-reachable to probably reachable, and might
798 * affect the status of associated prefixes..
806 * Check if the link-layer address has changed or not.
811 if (ln->la_flags & LLE_VALID) {
812 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
821 * This is VERY complex. Look at it with care.
823 * override solicit lladdr llchange action
828 * 0 0 y y (1) REACHABLE->STALE
829 * 0 1 n -- (2c) *->REACHABLE
830 * 0 1 y n (2b) L *->REACHABLE
831 * 0 1 y y (1) REACHABLE->STALE
834 * 1 0 y y (2a) L *->STALE
835 * 1 1 n -- (2a) *->REACHABLE
836 * 1 1 y n (2a) L *->REACHABLE
837 * 1 1 y y (2a) L *->REACHABLE
839 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
841 * If state is REACHABLE, make it STALE.
842 * no other updates should be done.
844 if (ln->ln_state == ND6_LLINFO_REACHABLE)
845 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
847 } else if (is_override /* (2a) */
848 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
849 || lladdr == NULL) { /* (2c) */
851 * Update link-local address, if any.
853 if (lladdr != NULL) {
854 linkhdrsize = sizeof(linkhdr);
855 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
856 linkhdr, &linkhdrsize, &lladdr_off) != 0)
858 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
859 linkhdrsize, lladdr_off) == 0)
861 EVENTHANDLER_INVOKE(lle_event, ln,
866 * If solicited, make the state REACHABLE.
867 * If not solicited and the link-layer address was
868 * changed, make it STALE.
871 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
873 if (lladdr != NULL && llchange)
874 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
878 if (ln->ln_router && !is_router) {
880 * The peer dropped the router flag.
881 * Remove the sender from the Default Router List and
882 * update the Destination Cache entries.
884 struct ifnet *nd6_ifp;
886 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
887 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
888 (ND_IFINFO(nd6_ifp)->flags &
889 ND6_IFF_ACCEPT_RTADV) != 0)
891 * Even if the neighbor is not in the default
892 * router list, the neighbor may be used as a
893 * next hop for some destinations (e.g. redirect
894 * case). So we must call rt6_flush explicitly.
896 rt6_flush(&ip6->ip6_src, ifp);
898 ln->ln_router = is_router;
902 * rt->rt_flags &= ~RTF_REJECT;
905 if (ln->la_hold != NULL)
906 chain = nd6_grab_holdchain(ln);
912 nd6_flush_holdchain(ifp, ln, chain);
914 nd6_flush_children_holdchain(ifp, ln);
917 pfxlist_onlink_check();
926 ICMP6STAT_INC(icp6s_badna);
931 * Neighbor advertisement output handling.
935 * the following items are not implemented yet:
936 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
937 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
939 * tlladdr - 1 if include target link-layer address
940 * sdl0 - sockaddr_dl (= proxy NA) or NULL
943 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
944 const struct in6_addr *taddr6, u_long flags, int tlladdr,
945 struct sockaddr *sdl0, u_int fibnum)
950 struct nd_neighbor_advert *nd_na;
951 struct ip6_moptions im6o;
952 struct in6_addr daddr6, dst6, src6;
957 int icmp6len, maxlen, error;
960 daddr6 = *daddr6_0; /* make a local copy for modification */
962 /* estimate the size of message */
963 maxlen = sizeof(*ip6) + sizeof(*nd_na);
964 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
965 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
966 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
967 __func__, max_linkhdr, maxlen, MCLBYTES));
969 if (max_linkhdr + maxlen > MHLEN)
970 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
972 m = m_gethdr(M_NOWAIT, MT_DATA);
977 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
978 m->m_flags |= M_MCAST;
979 im6o.im6o_multicast_ifp = ifp;
980 im6o.im6o_multicast_hlim = 255;
981 im6o.im6o_multicast_loop = 0;
984 icmp6len = sizeof(*nd_na);
985 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
986 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
988 /* fill neighbor advertisement packet */
989 ip6 = mtod(m, struct ip6_hdr *);
991 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
992 ip6->ip6_vfc |= IPV6_VERSION;
993 ip6->ip6_nxt = IPPROTO_ICMPV6;
995 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
997 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
998 daddr6.s6_addr16[1] = 0;
999 daddr6.s6_addr32[1] = 0;
1000 daddr6.s6_addr32[2] = 0;
1001 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
1002 if (in6_setscope(&daddr6, ifp, NULL))
1005 flags &= ~ND_NA_FLAG_SOLICITED;
1007 ip6->ip6_dst = daddr6;
1010 * Select a source whose scope is the same as that of the dest.
1012 in6_splitscope(&daddr6, &dst6, &scopeid);
1013 error = in6_selectsrc_addr(fibnum, &dst6,
1014 scopeid, ifp, &src6, NULL);
1016 char ip6buf[INET6_ADDRSTRLEN];
1017 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1018 "determined: dst=%s, error=%d\n",
1019 ip6_sprintf(ip6buf, &daddr6), error));
1022 ip6->ip6_src = src6;
1023 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1024 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1025 nd_na->nd_na_code = 0;
1026 nd_na->nd_na_target = *taddr6;
1027 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1030 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1031 * see nd6_ns_input() for details.
1032 * Basically, if NS packet is sent to unicast/anycast addr,
1033 * target lladdr option SHOULD NOT be included.
1037 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1038 * lladdr in sdl0. If we are not proxying (sending NA for
1039 * my address) use lladdr configured for the interface.
1043 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1045 mac = nd6_ifptomac(ifp);
1046 } else if (sdl0->sa_family == AF_LINK) {
1047 struct sockaddr_dl *sdl;
1048 sdl = (struct sockaddr_dl *)sdl0;
1049 if (sdl->sdl_alen == ifp->if_addrlen)
1053 if (tlladdr && mac) {
1054 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1055 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1057 /* roundup to 8 bytes alignment! */
1058 optlen = (optlen + 7) & ~7;
1060 m->m_pkthdr.len += optlen;
1063 bzero((caddr_t)nd_opt, optlen);
1064 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1065 nd_opt->nd_opt_len = optlen >> 3;
1066 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1068 flags &= ~ND_NA_FLAG_OVERRIDE;
1070 ip6->ip6_plen = htons((u_short)icmp6len);
1071 nd_na->nd_na_flags_reserved = flags;
1072 nd_na->nd_na_cksum = 0;
1073 nd_na->nd_na_cksum =
1074 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1076 if (send_sendso_input_hook != NULL) {
1077 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1078 sizeof(unsigned short), M_NOWAIT);
1081 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1082 m_tag_prepend(m, mtag);
1085 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1086 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1087 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1088 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1096 #ifndef BURN_BRIDGES
1098 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1099 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1100 struct sockaddr *sdl0)
1103 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1109 nd6_ifptomac(struct ifnet *ifp)
1111 switch (ifp->if_type) {
1115 case IFT_INFINIBAND:
1117 return IF_LLADDR(ifp);
1124 TAILQ_ENTRY(dadq) dad_list;
1125 struct ifaddr *dad_ifa;
1126 int dad_count; /* max NS to send */
1127 int dad_ns_tcount; /* # of trials to send NS */
1128 int dad_ns_ocount; /* NS sent so far */
1131 int dad_ns_lcount; /* looped back NS */
1132 int dad_loopbackprobe; /* probing state for loopback detection */
1133 struct callout dad_timer_ch;
1134 struct vnet *dad_vnet;
1136 #define ND_OPT_NONCE_LEN32 \
1137 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1138 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1139 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
1142 VNET_DEFINE_STATIC(TAILQ_HEAD(, dadq), dadq);
1143 VNET_DEFINE_STATIC(struct rwlock, dad_rwlock);
1144 #define V_dadq VNET(dadq)
1145 #define V_dad_rwlock VNET(dad_rwlock)
1147 #define DADQ_LOCKPTR() (&V_dad_rwlock)
1148 #define DADQ_LOCK_INIT() rw_init(DADQ_LOCKPTR(), "nd6 DAD queue")
1149 #define DADQ_RLOCK() rw_rlock(DADQ_LOCKPTR())
1150 #define DADQ_RUNLOCK() rw_runlock(DADQ_LOCKPTR())
1151 #define DADQ_WLOCK() rw_wlock(DADQ_LOCKPTR())
1152 #define DADQ_WUNLOCK() rw_wunlock(DADQ_LOCKPTR())
1154 #define DADQ_LOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_LOCKED);
1155 #define DADQ_RLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_RLOCKED);
1156 #define DADQ_WLOCK_ASSERT() rw_assert(DADQ_LOCKPTR(), RA_WLOCKED);
1159 nd6_dad_add(struct dadq *dp)
1161 DADQ_WLOCK_ASSERT();
1163 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1164 dp->dad_ondadq = true;
1168 nd6_dad_del(struct dadq *dp)
1170 DADQ_WLOCK_ASSERT();
1172 if (dp->dad_ondadq) {
1174 * Remove dp from the dadq and release the dadq's
1177 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1178 dp->dad_ondadq = false;
1183 static struct dadq *
1184 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1190 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1191 if (dp->dad_ifa != ifa)
1195 * Skip if the nonce matches the received one.
1196 * +2 in the length is required because of type and
1197 * length fields are included in a header.
1200 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1201 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1202 ND_OPT_NONCE_LEN) == 0) {
1203 dp->dad_ns_lcount++;
1213 nd6_dad_starttimer(struct dadq *dp, int ticks)
1215 DADQ_WLOCK_ASSERT();
1217 callout_reset(&dp->dad_timer_ch, ticks, nd6_dad_timer, dp);
1221 nd6_dad_stoptimer(struct dadq *dp)
1223 callout_drain(&dp->dad_timer_ch);
1227 nd6_dad_rele(struct dadq *dp)
1229 if (refcount_release(&dp->dad_refcnt)) {
1230 KASSERT(!dp->dad_ondadq, ("dp %p still on DAD queue", dp));
1231 ifa_free(dp->dad_ifa);
1240 TAILQ_INIT(&V_dadq);
1244 * Start Duplicate Address Detection (DAD) for specified interface address.
1247 nd6_dad_start(struct ifaddr *ifa, int delay)
1249 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1251 char ip6buf[INET6_ADDRSTRLEN];
1253 KASSERT((ia->ia6_flags & IN6_IFF_TENTATIVE) != 0,
1254 ("starting DAD on non-tentative address %p", ifa));
1257 * If we don't need DAD, don't do it.
1258 * There are several cases:
1259 * - DAD is disabled globally or on the interface
1260 * - the interface address is anycast
1262 if ((ia->ia6_flags & IN6_IFF_ANYCAST) != 0 ||
1263 V_ip6_dad_count == 0 ||
1264 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) != 0) {
1265 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1268 if ((ifa->ifa_ifp->if_flags & IFF_UP) == 0 ||
1269 (ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
1270 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED) != 0)
1274 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1276 * DAD is already in progress. Let the existing entry
1283 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1285 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1287 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1288 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1291 callout_init_rw(&dp->dad_timer_ch, DADQ_LOCKPTR(),
1292 CALLOUT_RETURNUNLOCKED);
1294 dp->dad_vnet = curvnet;
1296 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1297 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1300 * Send NS packet for DAD, ip6_dad_count times.
1301 * Note that we must delay the first transmission, if this is the
1302 * first packet to be sent from the interface after interface
1303 * (re)initialization.
1306 ifa_ref(dp->dad_ifa);
1307 dp->dad_count = V_ip6_dad_count;
1308 dp->dad_ns_icount = dp->dad_na_icount = 0;
1309 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1310 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1312 /* Add this to the dadq and add a reference for the dadq. */
1313 refcount_init(&dp->dad_refcnt, 1);
1315 nd6_dad_starttimer(dp, delay);
1320 * terminate DAD unconditionally. used for address removals.
1323 nd6_dad_stop(struct ifaddr *ifa)
1328 dp = nd6_dad_find(ifa, NULL);
1331 /* DAD wasn't started yet */
1336 * Acquire a temporary reference so that we can safely stop the callout.
1338 (void)refcount_acquire(&dp->dad_refcnt);
1342 nd6_dad_stoptimer(dp);
1347 nd6_dad_timer(void *arg)
1349 struct dadq *dp = arg;
1350 struct ifaddr *ifa = dp->dad_ifa;
1351 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1352 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1353 char ip6buf[INET6_ADDRSTRLEN];
1354 struct epoch_tracker et;
1356 CURVNET_SET(dp->dad_vnet);
1357 KASSERT(ia != NULL, ("DAD entry %p with no address", dp));
1359 NET_EPOCH_ENTER(et);
1360 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1361 /* Do not need DAD for ifdisabled interface. */
1362 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1363 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1366 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1367 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1369 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1370 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1373 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1374 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1376 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1377 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1381 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1382 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1383 (((ifp->if_flags & IFF_UP) == 0) ||
1384 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1385 nd6log((LOG_INFO, "%s: could not run DAD "
1386 "because the interface was down or not running.\n",
1387 if_name(ifa->ifa_ifp)));
1391 /* Need more checks? */
1392 if (dp->dad_ns_ocount < dp->dad_count) {
1394 * We have more NS to go. Send NS packet for DAD.
1396 nd6_dad_starttimer(dp,
1397 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1398 nd6_dad_ns_output(dp);
1402 * We have transmitted sufficient number of DAD packets.
1403 * See what we've got.
1405 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0) {
1406 /* We've seen NS or NA, means DAD has failed. */
1407 nd6_dad_duplicated(ifa, dp);
1408 } else if (V_dad_enhanced != 0 &&
1409 dp->dad_ns_lcount > 0 &&
1410 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1412 * Sec. 4.1 in RFC 7527 requires transmission of
1413 * additional probes until the loopback condition
1414 * becomes clear when a looped back probe is detected.
1416 log(LOG_ERR, "%s: a looped back NS message is "
1417 "detected during DAD for %s. "
1418 "Another DAD probes are being sent.\n",
1419 if_name(ifa->ifa_ifp),
1420 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1421 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1423 * Send an NS immediately and increase dad_count by
1424 * V_nd6_mmaxtries - 1.
1427 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1428 nd6_dad_starttimer(dp,
1429 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1430 nd6_dad_ns_output(dp);
1434 * We are done with DAD. No NA came, no NS came.
1435 * No duplicate address found. Check IFDISABLED flag
1436 * again in case that it is changed between the
1437 * beginning of this function and here.
1439 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1440 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1443 "%s: DAD complete for %s - no duplicates found\n",
1444 if_name(ifa->ifa_ifp),
1445 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1446 if (dp->dad_ns_lcount > 0)
1447 log(LOG_ERR, "%s: DAD completed while "
1448 "a looped back NS message is detected "
1449 "during DAD for %s.\n",
1450 if_name(ifa->ifa_ifp),
1451 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1463 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1465 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1467 char ip6buf[INET6_ADDRSTRLEN];
1469 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1470 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1471 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1472 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1475 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1476 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1479 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1480 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1481 log(LOG_ERR, "%s: manual intervention required\n",
1485 * If the address is a link-local address formed from an interface
1486 * identifier based on the hardware address which is supposed to be
1487 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1488 * operation on the interface SHOULD be disabled.
1489 * [RFC 4862, Section 5.4.5]
1491 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1492 struct in6_addr in6;
1495 * To avoid over-reaction, we only apply this logic when we are
1496 * very sure that hardware addresses are supposed to be unique.
1498 switch (ifp->if_type) {
1502 case IFT_INFINIBAND:
1503 in6 = ia->ia_addr.sin6_addr;
1504 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1505 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1506 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1507 log(LOG_ERR, "%s: possible hardware address "
1508 "duplication detected, disable IPv6\n",
1517 * Transmit a neighbour solicitation for the purpose of DAD. Returns with the
1518 * DAD queue unlocked.
1521 nd6_dad_ns_output(struct dadq *dp)
1523 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1524 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1527 DADQ_WLOCK_ASSERT();
1529 dp->dad_ns_tcount++;
1530 if ((ifp->if_flags & IFF_UP) == 0) {
1534 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1539 dp->dad_ns_ocount++;
1540 if (V_dad_enhanced != 0) {
1541 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1542 dp->dad_nonce[i] = arc4random();
1544 * XXXHRS: Note that in the case that
1545 * DupAddrDetectTransmits > 1, multiple NS messages with
1546 * different nonces can be looped back in an unexpected
1547 * order. The current implementation recognizes only
1548 * the latest nonce on the sender side. Practically it
1549 * should work well in almost all cases.
1553 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1554 (uint8_t *)&dp->dad_nonce[0]);
1558 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1563 panic("ifa == NULL in nd6_dad_ns_input");
1565 /* Ignore Nonce option when Enhanced DAD is disabled. */
1566 if (V_dad_enhanced == 0)
1569 dp = nd6_dad_find(ifa, ndopt_nonce);
1571 dp->dad_ns_icount++;
1576 nd6_dad_na_input(struct ifaddr *ifa)
1581 panic("ifa == NULL in nd6_dad_na_input");
1584 dp = nd6_dad_find(ifa, NULL);
1586 dp->dad_na_icount++;