2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
37 #include "opt_ipsec.h"
38 #include "opt_mpath.h"
40 #include <sys/param.h>
41 #include <sys/systm.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/route.h>
64 #include <net/radix_mpath.h>
68 #include <netinet/in.h>
69 #include <netinet/in_var.h>
70 #include <net/if_llatbl.h>
71 #include <netinet6/in6_var.h>
72 #include <netinet6/in6_ifattach.h>
73 #include <netinet/ip6.h>
74 #include <netinet6/ip6_var.h>
75 #include <netinet6/scope6_var.h>
76 #include <netinet6/nd6.h>
77 #include <netinet/icmp6.h>
78 #include <netinet/ip_carp.h>
79 #include <netinet6/send.h>
81 #define SDL(s) ((struct sockaddr_dl *)s)
84 static struct dadq *nd6_dad_find(struct ifaddr *, struct nd_opt_nonce *);
85 static void nd6_dad_add(struct dadq *dp);
86 static void nd6_dad_del(struct dadq *dp);
87 static void nd6_dad_rele(struct dadq *);
88 static void nd6_dad_starttimer(struct dadq *, int, int);
89 static void nd6_dad_stoptimer(struct dadq *);
90 static void nd6_dad_timer(struct dadq *);
91 static void nd6_dad_duplicated(struct ifaddr *, struct dadq *);
92 static void nd6_dad_ns_output(struct dadq *);
93 static void nd6_dad_ns_input(struct ifaddr *, struct nd_opt_nonce *);
94 static void nd6_dad_na_input(struct ifaddr *);
95 static void nd6_na_output_fib(struct ifnet *, const struct in6_addr *,
96 const struct in6_addr *, u_long, int, struct sockaddr *, u_int);
97 static void nd6_ns_output_fib(struct ifnet *, const struct in6_addr *,
98 const struct in6_addr *, const struct in6_addr *, uint8_t *, u_int);
100 static VNET_DEFINE(int, dad_enhanced) = 1;
101 #define V_dad_enhanced VNET(dad_enhanced)
103 SYSCTL_DECL(_net_inet6_ip6);
104 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, dad_enhanced, CTLFLAG_VNET | CTLFLAG_RW,
105 &VNET_NAME(dad_enhanced), 0,
106 "Enable Enhanced DAD, which adds a random nonce to NS messages for DAD.");
108 static VNET_DEFINE(int, dad_maxtry) = 15; /* max # of *tries* to
109 transmit DAD packet */
110 #define V_dad_maxtry VNET(dad_maxtry)
113 * Input a Neighbor Solicitation Message.
116 * Based on RFC 2462 (duplicate address detection)
119 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
121 struct ifnet *ifp = m->m_pkthdr.rcvif;
122 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
123 struct nd_neighbor_solicit *nd_ns;
124 struct in6_addr saddr6 = ip6->ip6_src;
125 struct in6_addr daddr6 = ip6->ip6_dst;
126 struct in6_addr taddr6;
127 struct in6_addr myaddr6;
129 struct ifaddr *ifa = NULL;
131 int anycast = 0, proxy = 0, tentative = 0;
134 union nd_opts ndopts;
135 struct sockaddr_dl proxydl;
136 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
138 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
139 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
141 #ifndef PULLDOWN_TEST
142 IP6_EXTHDR_CHECK(m, off, icmp6len,);
143 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
145 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
147 ICMP6STAT_INC(icp6s_tooshort);
151 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
152 taddr6 = nd_ns->nd_ns_target;
153 if (in6_setscope(&taddr6, ifp, NULL) != 0)
156 if (ip6->ip6_hlim != 255) {
158 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
159 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
160 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
164 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
165 /* dst has to be a solicited node multicast address. */
166 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
167 /* don't check ifindex portion */
168 daddr6.s6_addr32[1] == 0 &&
169 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
170 daddr6.s6_addr8[12] == 0xff) {
173 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
174 "(wrong ip6 dst)\n"));
177 } else if (!V_nd6_onlink_ns_rfc4861) {
178 struct sockaddr_in6 src_sa6;
181 * According to recent IETF discussions, it is not a good idea
182 * to accept a NS from an address which would not be deemed
183 * to be a neighbor otherwise. This point is expected to be
184 * clarified in future revisions of the specification.
186 bzero(&src_sa6, sizeof(src_sa6));
187 src_sa6.sin6_family = AF_INET6;
188 src_sa6.sin6_len = sizeof(src_sa6);
189 src_sa6.sin6_addr = saddr6;
190 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
191 nd6log((LOG_INFO, "nd6_ns_input: "
192 "NS packet from non-neighbor\n"));
197 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
198 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
202 icmp6len -= sizeof(*nd_ns);
203 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
204 if (nd6_options(&ndopts) < 0) {
206 "nd6_ns_input: invalid ND option, ignored\n"));
207 /* nd6_options have incremented stats */
211 if (ndopts.nd_opts_src_lladdr) {
212 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
213 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
216 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
217 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
218 "(link-layer address option)\n"));
223 * Attaching target link-layer address to the NA?
226 * NS IP dst is unicast/anycast MUST NOT add
227 * NS IP dst is solicited-node multicast MUST add
229 * In implementation, we add target link-layer address by default.
230 * We do not add one in MUST NOT cases.
232 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
238 * Target address (taddr6) must be either:
239 * (1) Valid unicast/anycast address for my receiving interface,
240 * (2) Unicast address for which I'm offering proxy service, or
241 * (3) "tentative" address on which DAD is being performed.
243 /* (1) and (3) check. */
245 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
247 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
251 struct sockaddr_dl rt_gateway;
252 struct rt_addrinfo info;
253 struct sockaddr_in6 dst6;
255 bzero(&dst6, sizeof(dst6));
256 dst6.sin6_len = sizeof(struct sockaddr_in6);
257 dst6.sin6_family = AF_INET6;
258 dst6.sin6_addr = taddr6;
260 bzero(&rt_gateway, sizeof(rt_gateway));
261 rt_gateway.sdl_len = sizeof(rt_gateway);
262 bzero(&info, sizeof(info));
263 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
265 /* Always use the default FIB. */
266 if (rib_lookup_info(RT_DEFAULT_FIB, (struct sockaddr *)&dst6,
268 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
269 rt_gateway.sdl_family == AF_LINK) {
272 * proxy NDP for single entry
274 proxydl = *SDL(&rt_gateway);
275 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
276 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
284 * We've got an NS packet, and we don't have that adddress
285 * assigned for us. We MUST silently ignore it.
290 myaddr6 = *IFA_IN6(ifa);
291 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
292 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
293 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
296 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
297 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
298 "(if %d, NS packet %d)\n",
299 ip6_sprintf(ip6bufs, &taddr6),
300 ifp->if_addrlen, lladdrlen - 2));
304 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
305 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
306 ip6_sprintf(ip6bufs, &saddr6)));
311 * We have neighbor solicitation packet, with target address equals to
312 * one of my tentative address.
314 * src addr how to process?
316 * multicast of course, invalid (rejected in ip6_input)
317 * unicast somebody is doing address resolution -> ignore
318 * unspec dup address detection
320 * The processing is defined in RFC 2462.
324 * If source address is unspecified address, it is for
325 * duplicate address detection.
327 * If not, the packet is for addess resolution;
328 * silently ignore it.
330 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
331 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
337 * If the source address is unspecified address, entries must not
338 * be created or updated.
339 * It looks that sender is performing DAD. Output NA toward
340 * all-node multicast address, to tell the sender that I'm using
342 * S bit ("solicited") must be zero.
344 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
345 struct in6_addr in6_all;
347 in6_all = in6addr_linklocal_allnodes;
348 if (in6_setscope(&in6_all, ifp, NULL) != 0)
350 nd6_na_output_fib(ifp, &in6_all, &taddr6,
351 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
352 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
357 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
358 ND_NEIGHBOR_SOLICIT, 0);
360 nd6_na_output_fib(ifp, &saddr6, &taddr6,
361 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
362 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
363 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
371 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
372 ip6_sprintf(ip6bufs, &saddr6)));
373 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
374 ip6_sprintf(ip6bufs, &daddr6)));
375 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
376 ip6_sprintf(ip6bufs, &taddr6)));
377 ICMP6STAT_INC(icp6s_badns);
384 * Output a Neighbor Solicitation Message. Caller specifies:
385 * - ICMP6 header source IP6 address
386 * - ND6 header target IP6 address
387 * - ND6 header source datalink address
390 * Based on RFC 2462 (duplicate address detection)
392 * ln - for source address determination
393 * nonce - If non-NULL, NS is used for duplicate address detection and
394 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
397 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
398 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
399 uint8_t *nonce, u_int fibnum)
404 struct nd_neighbor_solicit *nd_ns;
405 struct ip6_moptions im6o;
410 if (IN6_IS_ADDR_MULTICAST(taddr6))
413 /* estimate the size of message */
414 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
415 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
416 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
417 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
418 __func__, max_linkhdr, maxlen, MCLBYTES));
420 if (max_linkhdr + maxlen > MHLEN)
421 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
423 m = m_gethdr(M_NOWAIT, MT_DATA);
428 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
429 m->m_flags |= M_MCAST;
430 im6o.im6o_multicast_ifp = ifp;
431 im6o.im6o_multicast_hlim = 255;
432 im6o.im6o_multicast_loop = 0;
435 icmp6len = sizeof(*nd_ns);
436 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
437 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
439 /* fill neighbor solicitation packet */
440 ip6 = mtod(m, struct ip6_hdr *);
442 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
443 ip6->ip6_vfc |= IPV6_VERSION;
444 /* ip6->ip6_plen will be set later */
445 ip6->ip6_nxt = IPPROTO_ICMPV6;
448 ip6->ip6_dst = *daddr6;
450 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
451 ip6->ip6_dst.s6_addr16[1] = 0;
452 ip6->ip6_dst.s6_addr32[1] = 0;
453 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
454 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
455 ip6->ip6_dst.s6_addr8[12] = 0xff;
456 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
460 struct ifaddr *ifa = NULL;
464 * "If the source address of the packet prompting the
465 * solicitation is the same as one of the addresses assigned
466 * to the outgoing interface, that address SHOULD be placed
467 * in the IP Source Address of the outgoing solicitation.
468 * Otherwise, any one of the addresses assigned to the
469 * interface should be used."
471 * We use the source address for the prompting packet
472 * (saddr6), if saddr6 belongs to the outgoing interface.
473 * Otherwise, we perform the source address selection as usual.
477 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
479 /* ip6_src set already. */
480 ip6->ip6_src = *saddr6;
484 struct in6_addr dst6, src6;
487 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
488 error = in6_selectsrc_addr(RT_DEFAULT_FIB, &dst6,
489 scopeid, ifp, &src6, NULL);
491 char ip6buf[INET6_ADDRSTRLEN];
492 nd6log((LOG_DEBUG, "%s: source can't be "
493 "determined: dst=%s, error=%d\n", __func__,
494 ip6_sprintf(ip6buf, &dst6),
502 * Source address for DAD packet must always be IPv6
503 * unspecified address. (0::0)
504 * We actually don't have to 0-clear the address (we did it
505 * above), but we do so here explicitly to make the intention
508 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
510 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
511 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
512 nd_ns->nd_ns_code = 0;
513 nd_ns->nd_ns_reserved = 0;
514 nd_ns->nd_ns_target = *taddr6;
515 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
518 * Add source link-layer address option.
520 * spec implementation
522 * DAD packet MUST NOT do not add the option
523 * there's no link layer address:
524 * impossible do not add the option
525 * there's link layer address:
526 * Multicast NS MUST add one add the option
527 * Unicast NS SHOULD add one add the option
529 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
530 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
531 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
532 /* 8 byte alignments... */
533 optlen = (optlen + 7) & ~7;
535 m->m_pkthdr.len += optlen;
538 bzero((caddr_t)nd_opt, optlen);
539 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
540 nd_opt->nd_opt_len = optlen >> 3;
541 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
544 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
545 * This behavior is documented as Enhanced Duplicate Address
546 * Detection in RFC 7527.
547 * net.inet6.ip6.dad_enhanced=0 disables this.
549 if (V_dad_enhanced != 0 && nonce != NULL) {
550 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
551 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
552 /* 8-byte alignment is required. */
553 optlen = (optlen + 7) & ~7;
555 m->m_pkthdr.len += optlen;
558 bzero((caddr_t)nd_opt, optlen);
559 nd_opt->nd_opt_type = ND_OPT_NONCE;
560 nd_opt->nd_opt_len = optlen >> 3;
561 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
563 ip6->ip6_plen = htons((u_short)icmp6len);
564 nd_ns->nd_ns_cksum = 0;
566 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
568 if (send_sendso_input_hook != NULL) {
569 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
570 sizeof(unsigned short), M_NOWAIT);
573 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
574 m_tag_prepend(m, mtag);
577 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
579 icmp6_ifstat_inc(ifp, ifs6_out_msg);
580 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
581 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
591 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
592 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
595 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
599 * Neighbor advertisement input handling.
602 * Based on RFC 2462 (duplicate address detection)
604 * the following items are not implemented yet:
605 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
606 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
609 nd6_na_input(struct mbuf *m, int off, int icmp6len)
611 struct ifnet *ifp = m->m_pkthdr.rcvif;
612 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
613 struct nd_neighbor_advert *nd_na;
614 struct in6_addr daddr6 = ip6->ip6_dst;
615 struct in6_addr taddr6;
624 struct llentry *ln = NULL;
625 union nd_opts ndopts;
626 struct mbuf *chain = NULL;
627 struct sockaddr_in6 sin6;
628 u_char linkhdr[LLE_MAX_LINKHDR];
631 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
633 if (ip6->ip6_hlim != 255) {
635 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
636 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
637 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
641 #ifndef PULLDOWN_TEST
642 IP6_EXTHDR_CHECK(m, off, icmp6len,);
643 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
645 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
647 ICMP6STAT_INC(icp6s_tooshort);
652 flags = nd_na->nd_na_flags_reserved;
653 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
654 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
655 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
656 memset(&sin6, 0, sizeof(sin6));
658 taddr6 = nd_na->nd_na_target;
659 if (in6_setscope(&taddr6, ifp, NULL))
660 goto bad; /* XXX: impossible */
662 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
664 "nd6_na_input: invalid target address %s\n",
665 ip6_sprintf(ip6bufs, &taddr6)));
668 if (IN6_IS_ADDR_MULTICAST(&daddr6))
671 "nd6_na_input: a solicited adv is multicasted\n"));
675 icmp6len -= sizeof(*nd_na);
676 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
677 if (nd6_options(&ndopts) < 0) {
679 "nd6_na_input: invalid ND option, ignored\n"));
680 /* nd6_options have incremented stats */
684 if (ndopts.nd_opts_tgt_lladdr) {
685 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
686 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
690 * This effectively disables the DAD check on a non-master CARP
694 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
696 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
699 * Target address matches one of my interface address.
701 * If my address is tentative, this means that there's somebody
702 * already using the same address as mine. This indicates DAD failure.
703 * This is defined in RFC 2462.
705 * Otherwise, process as defined in RFC 2461.
708 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
709 nd6_dad_na_input(ifa);
714 /* Just for safety, maybe unnecessary. */
718 "nd6_na_input: duplicate IP6 address %s\n",
719 ip6_sprintf(ip6bufs, &taddr6));
723 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
724 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
725 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
726 ifp->if_addrlen, lladdrlen - 2));
731 * If no neighbor cache entry is found, NA SHOULD silently be
734 IF_AFDATA_RLOCK(ifp);
735 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
736 IF_AFDATA_RUNLOCK(ifp);
741 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
743 * If the link-layer has address, and no lladdr option came,
744 * discard the packet.
746 if (ifp->if_addrlen && lladdr == NULL) {
751 * Record link-layer address, and update the state.
753 linkhdrsize = sizeof(linkhdr);
754 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
755 linkhdr, &linkhdrsize, &lladdr_off) != 0)
758 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
763 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
765 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
767 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
768 if ((ln->ln_router = is_router) != 0) {
770 * This means a router's state has changed from
771 * non-reachable to probably reachable, and might
772 * affect the status of associated prefixes..
780 * Check if the link-layer address has changed or not.
785 if (ln->la_flags & LLE_VALID) {
786 if (bcmp(lladdr, ln->ll_addr, ifp->if_addrlen))
795 * This is VERY complex. Look at it with care.
797 * override solicit lladdr llchange action
802 * 0 0 y y (1) REACHABLE->STALE
803 * 0 1 n -- (2c) *->REACHABLE
804 * 0 1 y n (2b) L *->REACHABLE
805 * 0 1 y y (1) REACHABLE->STALE
808 * 1 0 y y (2a) L *->STALE
809 * 1 1 n -- (2a) *->REACHABLE
810 * 1 1 y n (2a) L *->REACHABLE
811 * 1 1 y y (2a) L *->REACHABLE
813 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
815 * If state is REACHABLE, make it STALE.
816 * no other updates should be done.
818 if (ln->ln_state == ND6_LLINFO_REACHABLE)
819 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
821 } else if (is_override /* (2a) */
822 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
823 || lladdr == NULL) { /* (2c) */
825 * Update link-local address, if any.
827 if (lladdr != NULL) {
828 linkhdrsize = sizeof(linkhdr);
829 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
830 linkhdr, &linkhdrsize, &lladdr_off) != 0)
832 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
833 linkhdrsize, lladdr_off) == 0) {
837 EVENTHANDLER_INVOKE(lle_event, ln,
842 * If solicited, make the state REACHABLE.
843 * If not solicited and the link-layer address was
844 * changed, make it STALE.
847 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
849 if (lladdr != NULL && llchange)
850 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
854 if (ln->ln_router && !is_router) {
856 * The peer dropped the router flag.
857 * Remove the sender from the Default Router List and
858 * update the Destination Cache entries.
860 struct nd_defrouter *dr;
861 struct in6_addr *in6;
862 struct ifnet *nd6_ifp;
864 in6 = &ln->r_l3addr.addr6;
866 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
867 dr = defrouter_lookup(in6, nd6_ifp);
870 else if (ND_IFINFO(nd6_ifp)->flags &
871 ND6_IFF_ACCEPT_RTADV) {
873 * Even if the neighbor is not in the default
874 * router list, the neighbor may be used
875 * as a next hop for some destinations
876 * (e.g. redirect case). So we must
877 * call rt6_flush explicitly.
879 rt6_flush(&ip6->ip6_src, ifp);
882 ln->ln_router = is_router;
886 * rt->rt_flags &= ~RTF_REJECT;
889 if (ln->la_hold != NULL)
890 nd6_grab_holdchain(ln, &chain, &sin6);
896 nd6_flush_holdchain(ifp, ifp, chain, &sin6);
899 pfxlist_onlink_check();
908 ICMP6STAT_INC(icp6s_badna);
913 * Neighbor advertisement output handling.
917 * the following items are not implemented yet:
918 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
919 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
921 * tlladdr - 1 if include target link-layer address
922 * sdl0 - sockaddr_dl (= proxy NA) or NULL
925 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
926 const struct in6_addr *taddr6, u_long flags, int tlladdr,
927 struct sockaddr *sdl0, u_int fibnum)
932 struct nd_neighbor_advert *nd_na;
933 struct ip6_moptions im6o;
934 struct in6_addr daddr6, dst6, src6;
937 int icmp6len, maxlen, error;
940 daddr6 = *daddr6_0; /* make a local copy for modification */
942 /* estimate the size of message */
943 maxlen = sizeof(*ip6) + sizeof(*nd_na);
944 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
945 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
946 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
947 __func__, max_linkhdr, maxlen, MCLBYTES));
949 if (max_linkhdr + maxlen > MHLEN)
950 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
952 m = m_gethdr(M_NOWAIT, MT_DATA);
957 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
958 m->m_flags |= M_MCAST;
959 im6o.im6o_multicast_ifp = ifp;
960 im6o.im6o_multicast_hlim = 255;
961 im6o.im6o_multicast_loop = 0;
964 icmp6len = sizeof(*nd_na);
965 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
966 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
968 /* fill neighbor advertisement packet */
969 ip6 = mtod(m, struct ip6_hdr *);
971 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
972 ip6->ip6_vfc |= IPV6_VERSION;
973 ip6->ip6_nxt = IPPROTO_ICMPV6;
975 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
977 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
978 daddr6.s6_addr16[1] = 0;
979 daddr6.s6_addr32[1] = 0;
980 daddr6.s6_addr32[2] = 0;
981 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
982 if (in6_setscope(&daddr6, ifp, NULL))
985 flags &= ~ND_NA_FLAG_SOLICITED;
987 ip6->ip6_dst = daddr6;
990 * Select a source whose scope is the same as that of the dest.
992 in6_splitscope(&daddr6, &dst6, &scopeid);
993 error = in6_selectsrc_addr(RT_DEFAULT_FIB, &dst6,
994 scopeid, ifp, &src6, NULL);
996 char ip6buf[INET6_ADDRSTRLEN];
997 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
998 "determined: dst=%s, error=%d\n",
999 ip6_sprintf(ip6buf, &daddr6), error));
1002 ip6->ip6_src = src6;
1003 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1004 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1005 nd_na->nd_na_code = 0;
1006 nd_na->nd_na_target = *taddr6;
1007 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1010 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1011 * see nd6_ns_input() for details.
1012 * Basically, if NS packet is sent to unicast/anycast addr,
1013 * target lladdr option SHOULD NOT be included.
1017 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1018 * lladdr in sdl0. If we are not proxying (sending NA for
1019 * my address) use lladdr configured for the interface.
1023 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1025 mac = nd6_ifptomac(ifp);
1026 } else if (sdl0->sa_family == AF_LINK) {
1027 struct sockaddr_dl *sdl;
1028 sdl = (struct sockaddr_dl *)sdl0;
1029 if (sdl->sdl_alen == ifp->if_addrlen)
1033 if (tlladdr && mac) {
1034 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1035 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1037 /* roundup to 8 bytes alignment! */
1038 optlen = (optlen + 7) & ~7;
1040 m->m_pkthdr.len += optlen;
1043 bzero((caddr_t)nd_opt, optlen);
1044 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1045 nd_opt->nd_opt_len = optlen >> 3;
1046 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1048 flags &= ~ND_NA_FLAG_OVERRIDE;
1050 ip6->ip6_plen = htons((u_short)icmp6len);
1051 nd_na->nd_na_flags_reserved = flags;
1052 nd_na->nd_na_cksum = 0;
1053 nd_na->nd_na_cksum =
1054 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1056 if (send_sendso_input_hook != NULL) {
1057 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1058 sizeof(unsigned short), M_NOWAIT);
1061 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1062 m_tag_prepend(m, mtag);
1065 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1066 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1067 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1068 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1076 #ifndef BURN_BRIDGES
1078 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1079 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1080 struct sockaddr *sdl0)
1083 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1089 nd6_ifptomac(struct ifnet *ifp)
1091 switch (ifp->if_type) {
1098 case IFT_INFINIBAND:
1101 return IF_LLADDR(ifp);
1108 TAILQ_ENTRY(dadq) dad_list;
1109 struct ifaddr *dad_ifa;
1110 int dad_count; /* max NS to send */
1111 int dad_ns_tcount; /* # of trials to send NS */
1112 int dad_ns_ocount; /* NS sent so far */
1115 int dad_ns_lcount; /* looped back NS */
1116 int dad_loopbackprobe; /* probing state for loopback detection */
1117 struct callout dad_timer_ch;
1118 struct vnet *dad_vnet;
1120 #define ND_OPT_NONCE_LEN32 \
1121 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1122 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1125 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1126 static VNET_DEFINE(struct rwlock, dad_rwlock);
1127 #define V_dadq VNET(dadq)
1128 #define V_dad_rwlock VNET(dad_rwlock)
1130 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1131 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1132 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1133 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1136 nd6_dad_add(struct dadq *dp)
1140 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1145 nd6_dad_del(struct dadq *dp)
1149 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1154 static struct dadq *
1155 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1160 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1161 if (dp->dad_ifa != ifa)
1164 * Skip if the nonce matches the received one.
1165 * +2 in the length is required because of type and
1166 * length fields are included in a header.
1169 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1170 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1171 ND_OPT_NONCE_LEN) == 0) {
1172 dp->dad_ns_lcount++;
1175 refcount_acquire(&dp->dad_refcnt);
1184 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1188 nd6_dad_ns_output(dp);
1189 callout_reset(&dp->dad_timer_ch, ticks,
1190 (void (*)(void *))nd6_dad_timer, (void *)dp);
1194 nd6_dad_stoptimer(struct dadq *dp)
1197 callout_drain(&dp->dad_timer_ch);
1201 nd6_dad_rele(struct dadq *dp)
1204 if (refcount_release(&dp->dad_refcnt)) {
1205 ifa_free(dp->dad_ifa);
1214 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1215 TAILQ_INIT(&V_dadq);
1219 * Start Duplicate Address Detection (DAD) for specified interface address.
1222 nd6_dad_start(struct ifaddr *ifa, int delay)
1224 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1226 char ip6buf[INET6_ADDRSTRLEN];
1230 * If we don't need DAD, don't do it.
1231 * There are several cases:
1232 * - DAD is disabled (ip6_dad_count == 0)
1233 * - the interface address is anycast
1235 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1237 "nd6_dad_start: called with non-tentative address "
1239 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1240 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1243 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1244 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1247 if (!V_ip6_dad_count) {
1248 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1251 if (ifa->ifa_ifp == NULL)
1252 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1253 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) {
1254 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1257 if (!(ifa->ifa_ifp->if_flags & IFF_UP) ||
1258 !(ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) ||
1259 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)) {
1260 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1263 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1265 * DAD is already in progress. Let the existing entry
1272 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1274 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1276 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1277 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1280 callout_init(&dp->dad_timer_ch, 0);
1282 dp->dad_vnet = curvnet;
1284 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1285 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1288 * Send NS packet for DAD, ip6_dad_count times.
1289 * Note that we must delay the first transmission, if this is the
1290 * first packet to be sent from the interface after interface
1291 * (re)initialization.
1294 ifa_ref(dp->dad_ifa);
1295 dp->dad_count = V_ip6_dad_count;
1296 dp->dad_ns_icount = dp->dad_na_icount = 0;
1297 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1298 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1299 refcount_init(&dp->dad_refcnt, 1);
1304 delay = (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000;
1306 nd6_dad_starttimer(dp, delay, send_ns);
1310 * terminate DAD unconditionally. used for address removals.
1313 nd6_dad_stop(struct ifaddr *ifa)
1317 dp = nd6_dad_find(ifa, NULL);
1319 /* DAD wasn't started yet */
1323 nd6_dad_stoptimer(dp);
1326 * The DAD queue entry may have been removed by nd6_dad_timer() while
1327 * we were waiting for it to stop, so re-do the lookup.
1330 if (nd6_dad_find(ifa, NULL) == NULL)
1338 nd6_dad_timer(struct dadq *dp)
1340 CURVNET_SET(dp->dad_vnet);
1341 struct ifaddr *ifa = dp->dad_ifa;
1342 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1343 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1344 char ip6buf[INET6_ADDRSTRLEN];
1348 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1351 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1352 /* Do not need DAD for ifdisabled interface. */
1353 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1354 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1357 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1358 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1360 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1361 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1364 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1365 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1367 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1368 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1372 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1373 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1374 (((ifp->if_flags & IFF_UP) == 0) ||
1375 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1376 nd6log((LOG_INFO, "%s: could not run DAD "
1377 "because the interface was down or not running.\n",
1378 if_name(ifa->ifa_ifp)));
1382 /* Need more checks? */
1383 if (dp->dad_ns_ocount < dp->dad_count) {
1385 * We have more NS to go. Send NS packet for DAD.
1387 nd6_dad_starttimer(dp,
1388 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1392 * We have transmitted sufficient number of DAD packets.
1393 * See what we've got.
1395 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1396 /* We've seen NS or NA, means DAD has failed. */
1397 nd6_dad_duplicated(ifa, dp);
1398 else if (V_dad_enhanced != 0 &&
1399 dp->dad_ns_lcount > 0 &&
1400 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1402 * Sec. 4.1 in RFC 7527 requires transmission of
1403 * additional probes until the loopback condition
1404 * becomes clear when a looped back probe is detected.
1406 log(LOG_ERR, "%s: a looped back NS message is "
1407 "detected during DAD for %s. "
1408 "Another DAD probes are being sent.\n",
1409 if_name(ifa->ifa_ifp),
1410 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1411 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1413 * Send an NS immediately and increase dad_count by
1414 * V_nd6_mmaxtries - 1.
1417 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1418 nd6_dad_starttimer(dp,
1419 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1424 * We are done with DAD. No NA came, no NS came.
1425 * No duplicate address found. Check IFDISABLED flag
1426 * again in case that it is changed between the
1427 * beginning of this function and here.
1429 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1430 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1433 "%s: DAD complete for %s - no duplicates found\n",
1434 if_name(ifa->ifa_ifp),
1435 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1436 if (dp->dad_ns_lcount > 0)
1437 log(LOG_ERR, "%s: DAD completed while "
1438 "a looped back NS message is detected "
1439 "during DAD for %s.\n",
1440 if_name(ifa->ifa_ifp),
1441 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1451 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1453 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1455 char ip6buf[INET6_ADDRSTRLEN];
1457 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1458 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1459 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1460 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1463 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1464 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1467 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1468 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1469 log(LOG_ERR, "%s: manual intervention required\n",
1473 * If the address is a link-local address formed from an interface
1474 * identifier based on the hardware address which is supposed to be
1475 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1476 * operation on the interface SHOULD be disabled.
1477 * [RFC 4862, Section 5.4.5]
1479 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1480 struct in6_addr in6;
1483 * To avoid over-reaction, we only apply this logic when we are
1484 * very sure that hardware addresses are supposed to be unique.
1486 switch (ifp->if_type) {
1492 case IFT_INFINIBAND:
1493 in6 = ia->ia_addr.sin6_addr;
1494 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1495 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1496 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1497 log(LOG_ERR, "%s: possible hardware address "
1498 "duplication detected, disable IPv6\n",
1507 nd6_dad_ns_output(struct dadq *dp)
1509 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1510 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1513 dp->dad_ns_tcount++;
1514 if ((ifp->if_flags & IFF_UP) == 0) {
1517 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1521 dp->dad_ns_ocount++;
1522 if (V_dad_enhanced != 0) {
1523 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1524 dp->dad_nonce[i] = arc4random();
1526 * XXXHRS: Note that in the case that
1527 * DupAddrDetectTransmits > 1, multiple NS messages with
1528 * different nonces can be looped back in an unexpected
1529 * order. The current implementation recognizes only
1530 * the latest nonce on the sender side. Practically it
1531 * should work well in almost all cases.
1534 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1535 (uint8_t *)&dp->dad_nonce[0]);
1539 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1541 struct in6_ifaddr *ia;
1543 const struct in6_addr *taddr6;
1547 panic("ifa == NULL in nd6_dad_ns_input");
1549 ia = (struct in6_ifaddr *)ifa;
1551 taddr6 = &ia->ia_addr.sin6_addr;
1552 /* Ignore Nonce option when Enhanced DAD is disabled. */
1553 if (V_dad_enhanced == 0)
1555 dp = nd6_dad_find(ifa, ndopt_nonce);
1559 dp->dad_ns_icount++;
1564 nd6_dad_na_input(struct ifaddr *ifa)
1569 panic("ifa == NULL in nd6_dad_na_input");
1571 dp = nd6_dad_find(ifa, NULL);
1573 dp->dad_na_icount++;