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);
254 bzero(&ro, sizeof(ro));
255 ro.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
256 ro.ro_dst.sin6_family = AF_INET6;
257 ro.ro_dst.sin6_addr = taddr6;
259 /* Always use the default FIB. */
261 rtalloc_mpath_fib((struct route *)&ro, ntohl(taddr6.s6_addr32[3]),
264 in6_rtalloc(&ro, RT_DEFAULT_FIB);
266 need_proxy = (ro.ro_rt &&
267 (ro.ro_rt->rt_flags & RTF_ANNOUNCE) != 0 &&
268 ro.ro_rt->rt_gateway->sa_family == AF_LINK);
269 if (ro.ro_rt != NULL) {
271 proxydl = *SDL(ro.ro_rt->rt_gateway);
276 * proxy NDP for single entry
278 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
279 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
286 * We've got an NS packet, and we don't have that adddress
287 * assigned for us. We MUST silently ignore it.
292 myaddr6 = *IFA_IN6(ifa);
293 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
294 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
295 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
298 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
299 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
300 "(if %d, NS packet %d)\n",
301 ip6_sprintf(ip6bufs, &taddr6),
302 ifp->if_addrlen, lladdrlen - 2));
306 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
307 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
308 ip6_sprintf(ip6bufs, &saddr6)));
313 * We have neighbor solicitation packet, with target address equals to
314 * one of my tentative address.
316 * src addr how to process?
318 * multicast of course, invalid (rejected in ip6_input)
319 * unicast somebody is doing address resolution -> ignore
320 * unspec dup address detection
322 * The processing is defined in RFC 2462.
326 * If source address is unspecified address, it is for
327 * duplicate address detection.
329 * If not, the packet is for addess resolution;
330 * silently ignore it.
332 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
333 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
339 * If the source address is unspecified address, entries must not
340 * be created or updated.
341 * It looks that sender is performing DAD. Output NA toward
342 * all-node multicast address, to tell the sender that I'm using
344 * S bit ("solicited") must be zero.
346 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
347 struct in6_addr in6_all;
349 in6_all = in6addr_linklocal_allnodes;
350 if (in6_setscope(&in6_all, ifp, NULL) != 0)
352 nd6_na_output_fib(ifp, &in6_all, &taddr6,
353 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
354 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
359 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
360 ND_NEIGHBOR_SOLICIT, 0);
362 nd6_na_output_fib(ifp, &saddr6, &taddr6,
363 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
364 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
365 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
373 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
374 ip6_sprintf(ip6bufs, &saddr6)));
375 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
376 ip6_sprintf(ip6bufs, &daddr6)));
377 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
378 ip6_sprintf(ip6bufs, &taddr6)));
379 ICMP6STAT_INC(icp6s_badns);
386 * Output a Neighbor Solicitation Message. Caller specifies:
387 * - ICMP6 header source IP6 address
388 * - ND6 header target IP6 address
389 * - ND6 header source datalink address
392 * Based on RFC 2462 (duplicate address detection)
394 * ln - for source address determination
395 * nonce - If non-NULL, NS is used for duplicate address detection and
396 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
399 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
400 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
401 uint8_t *nonce, u_int fibnum)
406 struct nd_neighbor_solicit *nd_ns;
407 struct ip6_moptions im6o;
413 if (IN6_IS_ADDR_MULTICAST(taddr6))
416 /* estimate the size of message */
417 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
418 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
419 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
420 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
421 __func__, max_linkhdr, maxlen, MCLBYTES));
423 if (max_linkhdr + maxlen > MHLEN)
424 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
426 m = m_gethdr(M_NOWAIT, MT_DATA);
431 bzero(&ro, sizeof(ro));
433 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
434 m->m_flags |= M_MCAST;
435 im6o.im6o_multicast_ifp = ifp;
436 im6o.im6o_multicast_hlim = 255;
437 im6o.im6o_multicast_loop = 0;
440 icmp6len = sizeof(*nd_ns);
441 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
442 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
444 /* fill neighbor solicitation packet */
445 ip6 = mtod(m, struct ip6_hdr *);
447 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
448 ip6->ip6_vfc |= IPV6_VERSION;
449 /* ip6->ip6_plen will be set later */
450 ip6->ip6_nxt = IPPROTO_ICMPV6;
453 ip6->ip6_dst = *daddr6;
455 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
456 ip6->ip6_dst.s6_addr16[1] = 0;
457 ip6->ip6_dst.s6_addr32[1] = 0;
458 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
459 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
460 ip6->ip6_dst.s6_addr8[12] = 0xff;
461 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
465 struct ifaddr *ifa = NULL;
469 * "If the source address of the packet prompting the
470 * solicitation is the same as one of the addresses assigned
471 * to the outgoing interface, that address SHOULD be placed
472 * in the IP Source Address of the outgoing solicitation.
473 * Otherwise, any one of the addresses assigned to the
474 * interface should be used."
476 * We use the source address for the prompting packet
477 * (saddr6), if saddr6 belongs to the outgoing interface.
478 * Otherwise, we perform the source address selection as usual.
482 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
484 /* ip6_src set already. */
485 ip6->ip6_src = *saddr6;
489 struct sockaddr_in6 dst_sa;
490 struct in6_addr src_in;
493 bzero(&dst_sa, sizeof(dst_sa));
494 dst_sa.sin6_family = AF_INET6;
495 dst_sa.sin6_len = sizeof(dst_sa);
496 dst_sa.sin6_addr = ip6->ip6_dst;
499 error = in6_selectsrc(&dst_sa, NULL,
500 NULL, &ro, NULL, &oifp, &src_in);
502 char ip6buf[INET6_ADDRSTRLEN];
503 nd6log((LOG_DEBUG, "%s: source can't be "
504 "determined: dst=%s, error=%d\n", __func__,
505 ip6_sprintf(ip6buf, &dst_sa.sin6_addr),
509 ip6->ip6_src = src_in;
513 * Source address for DAD packet must always be IPv6
514 * unspecified address. (0::0)
515 * We actually don't have to 0-clear the address (we did it
516 * above), but we do so here explicitly to make the intention
519 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
521 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
522 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
523 nd_ns->nd_ns_code = 0;
524 nd_ns->nd_ns_reserved = 0;
525 nd_ns->nd_ns_target = *taddr6;
526 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
529 * Add source link-layer address option.
531 * spec implementation
533 * DAD packet MUST NOT do not add the option
534 * there's no link layer address:
535 * impossible do not add the option
536 * there's link layer address:
537 * Multicast NS MUST add one add the option
538 * Unicast NS SHOULD add one add the option
540 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
541 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
542 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
543 /* 8 byte alignments... */
544 optlen = (optlen + 7) & ~7;
546 m->m_pkthdr.len += optlen;
549 bzero((caddr_t)nd_opt, optlen);
550 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
551 nd_opt->nd_opt_len = optlen >> 3;
552 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
555 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
556 * This behavior is documented as Enhanced Duplicate Address
557 * Detection in RFC 7527.
558 * net.inet6.ip6.dad_enhanced=0 disables this.
560 if (V_dad_enhanced != 0 && nonce != NULL) {
561 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
562 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
563 /* 8-byte alignment is required. */
564 optlen = (optlen + 7) & ~7;
566 m->m_pkthdr.len += optlen;
569 bzero((caddr_t)nd_opt, optlen);
570 nd_opt->nd_opt_type = ND_OPT_NONCE;
571 nd_opt->nd_opt_len = optlen >> 3;
572 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
574 ip6->ip6_plen = htons((u_short)icmp6len);
575 nd_ns->nd_ns_cksum = 0;
577 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
579 if (send_sendso_input_hook != NULL) {
580 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
581 sizeof(unsigned short), M_NOWAIT);
584 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
585 m_tag_prepend(m, mtag);
588 ip6_output(m, NULL, &ro, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
590 icmp6_ifstat_inc(ifp, ifs6_out_msg);
591 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
592 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
594 /* We don't cache this route. */
609 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
610 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
613 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
617 * Neighbor advertisement input handling.
620 * Based on RFC 2462 (duplicate address detection)
622 * the following items are not implemented yet:
623 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
624 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
627 nd6_na_input(struct mbuf *m, int off, int icmp6len)
629 struct ifnet *ifp = m->m_pkthdr.rcvif;
630 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
631 struct nd_neighbor_advert *nd_na;
632 struct in6_addr daddr6 = ip6->ip6_dst;
633 struct in6_addr taddr6;
642 struct llentry *ln = NULL;
643 union nd_opts ndopts;
644 struct mbuf *chain = NULL;
645 struct sockaddr_in6 sin6;
646 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
648 if (ip6->ip6_hlim != 255) {
650 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
651 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
652 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
656 #ifndef PULLDOWN_TEST
657 IP6_EXTHDR_CHECK(m, off, icmp6len,);
658 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
660 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
662 ICMP6STAT_INC(icp6s_tooshort);
667 flags = nd_na->nd_na_flags_reserved;
668 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
669 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
670 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
671 memset(&sin6, 0, sizeof(sin6));
673 taddr6 = nd_na->nd_na_target;
674 if (in6_setscope(&taddr6, ifp, NULL))
675 goto bad; /* XXX: impossible */
677 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
679 "nd6_na_input: invalid target address %s\n",
680 ip6_sprintf(ip6bufs, &taddr6)));
683 if (IN6_IS_ADDR_MULTICAST(&daddr6))
686 "nd6_na_input: a solicited adv is multicasted\n"));
690 icmp6len -= sizeof(*nd_na);
691 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
692 if (nd6_options(&ndopts) < 0) {
694 "nd6_na_input: invalid ND option, ignored\n"));
695 /* nd6_options have incremented stats */
699 if (ndopts.nd_opts_tgt_lladdr) {
700 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
701 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
705 * This effectively disables the DAD check on a non-master CARP
709 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
711 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
714 * Target address matches one of my interface address.
716 * If my address is tentative, this means that there's somebody
717 * already using the same address as mine. This indicates DAD failure.
718 * This is defined in RFC 2462.
720 * Otherwise, process as defined in RFC 2461.
723 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
724 nd6_dad_na_input(ifa);
729 /* Just for safety, maybe unnecessary. */
733 "nd6_na_input: duplicate IP6 address %s\n",
734 ip6_sprintf(ip6bufs, &taddr6));
738 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
739 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
740 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
741 ifp->if_addrlen, lladdrlen - 2));
746 * If no neighbor cache entry is found, NA SHOULD silently be
749 IF_AFDATA_RLOCK(ifp);
750 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
751 IF_AFDATA_RUNLOCK(ifp);
756 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
758 * If the link-layer has address, and no lladdr option came,
759 * discard the packet.
761 if (ifp->if_addrlen && lladdr == NULL) {
766 * Record link-layer address, and update the state.
768 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
769 ln->la_flags |= LLE_VALID;
770 EVENTHANDLER_INVOKE(lle_event, ln, LLENTRY_RESOLVED);
772 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
774 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
775 if ((ln->ln_router = is_router) != 0) {
777 * This means a router's state has changed from
778 * non-reachable to probably reachable, and might
779 * affect the status of associated prefixes..
787 * Check if the link-layer address has changed or not.
792 if (ln->la_flags & LLE_VALID) {
793 if (bcmp(lladdr, &ln->ll_addr, ifp->if_addrlen))
802 * This is VERY complex. Look at it with care.
804 * override solicit lladdr llchange action
809 * 0 0 y y (1) REACHABLE->STALE
810 * 0 1 n -- (2c) *->REACHABLE
811 * 0 1 y n (2b) L *->REACHABLE
812 * 0 1 y y (1) REACHABLE->STALE
815 * 1 0 y y (2a) L *->STALE
816 * 1 1 n -- (2a) *->REACHABLE
817 * 1 1 y n (2a) L *->REACHABLE
818 * 1 1 y y (2a) L *->REACHABLE
820 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */
822 * If state is REACHABLE, make it STALE.
823 * no other updates should be done.
825 if (ln->ln_state == ND6_LLINFO_REACHABLE)
826 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
828 } else if (is_override /* (2a) */
829 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */
830 || lladdr == NULL) { /* (2c) */
832 * Update link-local address, if any.
834 if (lladdr != NULL) {
835 bcopy(lladdr, &ln->ll_addr, ifp->if_addrlen);
836 ln->la_flags |= LLE_VALID;
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;
863 in6 = &ln->r_l3addr.addr6;
866 * Lock to protect the default router list.
867 * XXX: this might be unnecessary, since this function
868 * is only called under the network software interrupt
869 * context. However, we keep it just for safety.
871 dr = defrouter_lookup(in6, ln->lle_tbl->llt_ifp);
874 else if (ND_IFINFO(ln->lle_tbl->llt_ifp)->flags &
875 ND6_IFF_ACCEPT_RTADV) {
877 * Even if the neighbor is not in the default
878 * router list, the neighbor may be used
879 * as a next hop for some destinations
880 * (e.g. redirect case). So we must
881 * call rt6_flush explicitly.
883 rt6_flush(&ip6->ip6_src, ifp);
886 ln->ln_router = is_router;
890 * rt->rt_flags &= ~RTF_REJECT;
893 if (ln->la_hold != NULL)
894 nd6_grab_holdchain(ln, &chain, &sin6);
900 nd6_flush_holdchain(ifp, ifp, chain, &sin6);
903 pfxlist_onlink_check();
912 ICMP6STAT_INC(icp6s_badna);
917 * Neighbor advertisement output handling.
921 * the following items are not implemented yet:
922 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
923 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
925 * tlladdr - 1 if include target link-layer address
926 * sdl0 - sockaddr_dl (= proxy NA) or NULL
929 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
930 const struct in6_addr *taddr6, u_long flags, int tlladdr,
931 struct sockaddr *sdl0, u_int fibnum)
937 struct nd_neighbor_advert *nd_na;
938 struct ip6_moptions im6o;
939 struct in6_addr src, daddr6;
940 struct sockaddr_in6 dst_sa;
941 int icmp6len, maxlen, error;
945 bzero(&ro, sizeof(ro));
947 daddr6 = *daddr6_0; /* make a local copy for modification */
949 /* estimate the size of message */
950 maxlen = sizeof(*ip6) + sizeof(*nd_na);
951 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
952 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
953 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
954 __func__, max_linkhdr, maxlen, MCLBYTES));
956 if (max_linkhdr + maxlen > MHLEN)
957 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
959 m = m_gethdr(M_NOWAIT, MT_DATA);
964 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
965 m->m_flags |= M_MCAST;
966 im6o.im6o_multicast_ifp = ifp;
967 im6o.im6o_multicast_hlim = 255;
968 im6o.im6o_multicast_loop = 0;
971 icmp6len = sizeof(*nd_na);
972 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
973 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
975 /* fill neighbor advertisement packet */
976 ip6 = mtod(m, struct ip6_hdr *);
978 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
979 ip6->ip6_vfc |= IPV6_VERSION;
980 ip6->ip6_nxt = IPPROTO_ICMPV6;
982 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
984 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
985 daddr6.s6_addr16[1] = 0;
986 daddr6.s6_addr32[1] = 0;
987 daddr6.s6_addr32[2] = 0;
988 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
989 if (in6_setscope(&daddr6, ifp, NULL))
992 flags &= ~ND_NA_FLAG_SOLICITED;
994 ip6->ip6_dst = daddr6;
995 bzero(&dst_sa, sizeof(struct sockaddr_in6));
996 dst_sa.sin6_family = AF_INET6;
997 dst_sa.sin6_len = sizeof(struct sockaddr_in6);
998 dst_sa.sin6_addr = daddr6;
1001 * Select a source whose scope is the same as that of the dest.
1003 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa));
1005 error = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &oifp, &src);
1007 char ip6buf[INET6_ADDRSTRLEN];
1008 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
1009 "determined: dst=%s, error=%d\n",
1010 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error));
1014 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1015 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1016 nd_na->nd_na_code = 0;
1017 nd_na->nd_na_target = *taddr6;
1018 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1021 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1022 * see nd6_ns_input() for details.
1023 * Basically, if NS packet is sent to unicast/anycast addr,
1024 * target lladdr option SHOULD NOT be included.
1028 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1029 * lladdr in sdl0. If we are not proxying (sending NA for
1030 * my address) use lladdr configured for the interface.
1034 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1036 mac = nd6_ifptomac(ifp);
1037 } else if (sdl0->sa_family == AF_LINK) {
1038 struct sockaddr_dl *sdl;
1039 sdl = (struct sockaddr_dl *)sdl0;
1040 if (sdl->sdl_alen == ifp->if_addrlen)
1044 if (tlladdr && mac) {
1045 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1046 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1048 /* roundup to 8 bytes alignment! */
1049 optlen = (optlen + 7) & ~7;
1051 m->m_pkthdr.len += optlen;
1054 bzero((caddr_t)nd_opt, optlen);
1055 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1056 nd_opt->nd_opt_len = optlen >> 3;
1057 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1059 flags &= ~ND_NA_FLAG_OVERRIDE;
1061 ip6->ip6_plen = htons((u_short)icmp6len);
1062 nd_na->nd_na_flags_reserved = flags;
1063 nd_na->nd_na_cksum = 0;
1064 nd_na->nd_na_cksum =
1065 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1067 if (send_sendso_input_hook != NULL) {
1068 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1069 sizeof(unsigned short), M_NOWAIT);
1072 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1073 m_tag_prepend(m, mtag);
1076 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL);
1077 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1078 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1079 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1081 /* We don't cache this route. */
1094 #ifndef BURN_BRIDGES
1096 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1097 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1098 struct sockaddr *sdl0)
1101 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1107 nd6_ifptomac(struct ifnet *ifp)
1109 switch (ifp->if_type) {
1116 case IFT_INFINIBAND:
1119 return IF_LLADDR(ifp);
1126 TAILQ_ENTRY(dadq) dad_list;
1127 struct ifaddr *dad_ifa;
1128 int dad_count; /* max NS to send */
1129 int dad_ns_tcount; /* # of trials to send NS */
1130 int dad_ns_ocount; /* NS sent so far */
1133 int dad_ns_lcount; /* looped back NS */
1134 int dad_loopbackprobe; /* probing state for loopback detection */
1135 struct callout dad_timer_ch;
1136 struct vnet *dad_vnet;
1138 #define ND_OPT_NONCE_LEN32 \
1139 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1140 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1143 static VNET_DEFINE(TAILQ_HEAD(, dadq), dadq);
1144 static VNET_DEFINE(struct rwlock, dad_rwlock);
1145 #define V_dadq VNET(dadq)
1146 #define V_dad_rwlock VNET(dad_rwlock)
1148 #define DADQ_RLOCK() rw_rlock(&V_dad_rwlock)
1149 #define DADQ_RUNLOCK() rw_runlock(&V_dad_rwlock)
1150 #define DADQ_WLOCK() rw_wlock(&V_dad_rwlock)
1151 #define DADQ_WUNLOCK() rw_wunlock(&V_dad_rwlock)
1154 nd6_dad_add(struct dadq *dp)
1158 TAILQ_INSERT_TAIL(&V_dadq, dp, dad_list);
1163 nd6_dad_del(struct dadq *dp)
1167 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1172 static struct dadq *
1173 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1178 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1179 if (dp->dad_ifa != ifa)
1182 * Skip if the nonce matches the received one.
1183 * +2 in the length is required because of type and
1184 * length fields are included in a header.
1187 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1188 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1189 ND_OPT_NONCE_LEN) == 0) {
1190 dp->dad_ns_lcount++;
1193 refcount_acquire(&dp->dad_refcnt);
1202 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1206 nd6_dad_ns_output(dp);
1207 callout_reset(&dp->dad_timer_ch, ticks,
1208 (void (*)(void *))nd6_dad_timer, (void *)dp);
1212 nd6_dad_stoptimer(struct dadq *dp)
1215 callout_drain(&dp->dad_timer_ch);
1219 nd6_dad_rele(struct dadq *dp)
1222 if (refcount_release(&dp->dad_refcnt)) {
1223 ifa_free(dp->dad_ifa);
1232 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1233 TAILQ_INIT(&V_dadq);
1237 * Start Duplicate Address Detection (DAD) for specified interface address.
1240 nd6_dad_start(struct ifaddr *ifa, int delay)
1242 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1244 char ip6buf[INET6_ADDRSTRLEN];
1248 * If we don't need DAD, don't do it.
1249 * There are several cases:
1250 * - DAD is disabled (ip6_dad_count == 0)
1251 * - the interface address is anycast
1253 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1255 "nd6_dad_start: called with non-tentative address "
1257 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1258 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1261 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1262 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1265 if (!V_ip6_dad_count) {
1266 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1269 if (ifa->ifa_ifp == NULL)
1270 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1271 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) {
1272 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1275 if (!(ifa->ifa_ifp->if_flags & IFF_UP) ||
1276 !(ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) ||
1277 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)) {
1278 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1281 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1283 * DAD already in progress. Let the existing entry
1289 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1291 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1293 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1294 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1297 callout_init(&dp->dad_timer_ch, 0);
1299 dp->dad_vnet = curvnet;
1301 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1302 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1305 * Send NS packet for DAD, ip6_dad_count times.
1306 * Note that we must delay the first transmission, if this is the
1307 * first packet to be sent from the interface after interface
1308 * (re)initialization.
1311 ifa_ref(dp->dad_ifa);
1312 dp->dad_count = V_ip6_dad_count;
1313 dp->dad_ns_icount = dp->dad_na_icount = 0;
1314 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1315 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1316 refcount_init(&dp->dad_refcnt, 1);
1321 delay = (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000;
1323 nd6_dad_starttimer(dp, delay, send_ns);
1327 * terminate DAD unconditionally. used for address removals.
1330 nd6_dad_stop(struct ifaddr *ifa)
1334 dp = nd6_dad_find(ifa, NULL);
1336 /* DAD wasn't started yet */
1340 nd6_dad_stoptimer(dp);
1343 * The DAD queue entry may have been removed by nd6_dad_timer() while
1344 * we were waiting for it to stop, so re-do the lookup.
1347 if (nd6_dad_find(ifa, NULL) == NULL)
1355 nd6_dad_timer(struct dadq *dp)
1357 CURVNET_SET(dp->dad_vnet);
1358 struct ifaddr *ifa = dp->dad_ifa;
1359 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1360 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1361 char ip6buf[INET6_ADDRSTRLEN];
1365 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1368 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1369 /* Do not need DAD for ifdisabled interface. */
1370 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1371 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1374 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1375 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1377 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1378 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1381 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1382 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1384 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1385 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1389 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1390 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1391 (((ifp->if_flags & IFF_UP) == 0) ||
1392 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1393 nd6log((LOG_INFO, "%s: could not run DAD "
1394 "because the interface was down or not running.\n",
1395 if_name(ifa->ifa_ifp)));
1399 /* Need more checks? */
1400 if (dp->dad_ns_ocount < dp->dad_count) {
1402 * We have more NS to go. Send NS packet for DAD.
1404 nd6_dad_starttimer(dp,
1405 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1409 * We have transmitted sufficient number of DAD packets.
1410 * See what we've got.
1412 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1413 /* We've seen NS or NA, means DAD has failed. */
1414 nd6_dad_duplicated(ifa, dp);
1415 else if (V_dad_enhanced != 0 &&
1416 dp->dad_ns_lcount > 0 &&
1417 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1419 * Sec. 4.1 in RFC 7527 requires transmission of
1420 * additional probes until the loopback condition
1421 * becomes clear when a looped back probe is detected.
1423 log(LOG_ERR, "%s: a looped back NS message is "
1424 "detected during DAD for %s. "
1425 "Another DAD probes are being sent.\n",
1426 if_name(ifa->ifa_ifp),
1427 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1428 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1430 * Send an NS immediately and increase dad_count by
1431 * V_nd6_mmaxtries - 1.
1434 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1435 nd6_dad_starttimer(dp,
1436 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1441 * We are done with DAD. No NA came, no NS came.
1442 * No duplicate address found. Check IFDISABLED flag
1443 * again in case that it is changed between the
1444 * beginning of this function and here.
1446 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1447 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1450 "%s: DAD complete for %s - no duplicates found\n",
1451 if_name(ifa->ifa_ifp),
1452 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1453 if (dp->dad_ns_lcount > 0)
1454 log(LOG_ERR, "%s: DAD completed while "
1455 "a looped back NS message is detected "
1456 "during DAD for %s.\n",
1457 if_name(ifa->ifa_ifp),
1458 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1468 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1470 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1472 char ip6buf[INET6_ADDRSTRLEN];
1474 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1475 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1476 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1477 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1480 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1481 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1484 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1485 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1486 log(LOG_ERR, "%s: manual intervention required\n",
1490 * If the address is a link-local address formed from an interface
1491 * identifier based on the hardware address which is supposed to be
1492 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1493 * operation on the interface SHOULD be disabled.
1494 * [RFC 4862, Section 5.4.5]
1496 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1497 struct in6_addr in6;
1500 * To avoid over-reaction, we only apply this logic when we are
1501 * very sure that hardware addresses are supposed to be unique.
1503 switch (ifp->if_type) {
1509 case IFT_INFINIBAND:
1510 in6 = ia->ia_addr.sin6_addr;
1511 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1512 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1513 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1514 log(LOG_ERR, "%s: possible hardware address "
1515 "duplication detected, disable IPv6\n",
1524 nd6_dad_ns_output(struct dadq *dp)
1526 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1527 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1530 dp->dad_ns_tcount++;
1531 if ((ifp->if_flags & IFF_UP) == 0) {
1534 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1538 dp->dad_ns_ocount++;
1539 if (V_dad_enhanced != 0) {
1540 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1541 dp->dad_nonce[i] = arc4random();
1543 * XXXHRS: Note that in the case that
1544 * DupAddrDetectTransmits > 1, multiple NS messages with
1545 * different nonces can be looped back in an unexpected
1546 * order. The current implementation recognizes only
1547 * the latest nonce on the sender side. Practically it
1548 * should work well in almost all cases.
1551 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1552 (uint8_t *)&dp->dad_nonce[0]);
1556 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1558 struct in6_ifaddr *ia;
1560 const struct in6_addr *taddr6;
1564 panic("ifa == NULL in nd6_dad_ns_input");
1566 ia = (struct in6_ifaddr *)ifa;
1568 taddr6 = &ia->ia_addr.sin6_addr;
1569 /* Ignore Nonce option when Enhanced DAD is disabled. */
1570 if (V_dad_enhanced == 0)
1572 dp = nd6_dad_find(ifa, ndopt_nonce);
1576 dp->dad_ns_icount++;
1581 nd6_dad_na_input(struct ifaddr *ifa)
1586 panic("ifa == NULL in nd6_dad_na_input");
1588 dp = nd6_dad_find(ifa, NULL);
1590 dp->dad_na_icount++;