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 /* RFC 6980: Nodes MUST silently ignore fragments */
139 if(m->m_flags & M_FRAGMENTED)
142 rflag = (V_ip6_forwarding) ? ND_NA_FLAG_ROUTER : 0;
143 if (ND_IFINFO(ifp)->flags & ND6_IFF_ACCEPT_RTADV && V_ip6_norbit_raif)
145 #ifndef PULLDOWN_TEST
146 IP6_EXTHDR_CHECK(m, off, icmp6len,);
147 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
149 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
151 ICMP6STAT_INC(icp6s_tooshort);
155 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
156 taddr6 = nd_ns->nd_ns_target;
157 if (in6_setscope(&taddr6, ifp, NULL) != 0)
160 if (ip6->ip6_hlim != 255) {
162 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
163 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
164 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
168 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
169 /* dst has to be a solicited node multicast address. */
170 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
171 /* don't check ifindex portion */
172 daddr6.s6_addr32[1] == 0 &&
173 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
174 daddr6.s6_addr8[12] == 0xff) {
177 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
178 "(wrong ip6 dst)\n"));
181 } else if (!V_nd6_onlink_ns_rfc4861) {
182 struct sockaddr_in6 src_sa6;
185 * According to recent IETF discussions, it is not a good idea
186 * to accept a NS from an address which would not be deemed
187 * to be a neighbor otherwise. This point is expected to be
188 * clarified in future revisions of the specification.
190 bzero(&src_sa6, sizeof(src_sa6));
191 src_sa6.sin6_family = AF_INET6;
192 src_sa6.sin6_len = sizeof(src_sa6);
193 src_sa6.sin6_addr = saddr6;
194 if (nd6_is_addr_neighbor(&src_sa6, ifp) == 0) {
195 nd6log((LOG_INFO, "nd6_ns_input: "
196 "NS packet from non-neighbor\n"));
201 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
202 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
206 icmp6len -= sizeof(*nd_ns);
207 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
208 if (nd6_options(&ndopts) < 0) {
210 "nd6_ns_input: invalid ND option, ignored\n"));
211 /* nd6_options have incremented stats */
215 if (ndopts.nd_opts_src_lladdr) {
216 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
217 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
220 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
221 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
222 "(link-layer address option)\n"));
227 * Attaching target link-layer address to the NA?
230 * NS IP dst is unicast/anycast MUST NOT add
231 * NS IP dst is solicited-node multicast MUST add
233 * In implementation, we add target link-layer address by default.
234 * We do not add one in MUST NOT cases.
236 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
242 * Target address (taddr6) must be either:
243 * (1) Valid unicast/anycast address for my receiving interface,
244 * (2) Unicast address for which I'm offering proxy service, or
245 * (3) "tentative" address on which DAD is being performed.
247 /* (1) and (3) check. */
249 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
251 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
255 struct sockaddr_dl rt_gateway;
256 struct rt_addrinfo info;
257 struct sockaddr_in6 dst6;
259 bzero(&dst6, sizeof(dst6));
260 dst6.sin6_len = sizeof(struct sockaddr_in6);
261 dst6.sin6_family = AF_INET6;
262 dst6.sin6_addr = taddr6;
264 bzero(&rt_gateway, sizeof(rt_gateway));
265 rt_gateway.sdl_len = sizeof(rt_gateway);
266 bzero(&info, sizeof(info));
267 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
269 if (rib_lookup_info(ifp->if_fib, (struct sockaddr *)&dst6,
271 if ((info.rti_flags & RTF_ANNOUNCE) != 0 &&
272 rt_gateway.sdl_family == AF_LINK) {
275 * proxy NDP for single entry
277 proxydl = *SDL(&rt_gateway);
278 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(
279 ifp, IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
287 * We've got an NS packet, and we don't have that adddress
288 * assigned for us. We MUST silently ignore it.
293 myaddr6 = *IFA_IN6(ifa);
294 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
295 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
296 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
299 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
300 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
301 "(if %d, NS packet %d)\n",
302 ip6_sprintf(ip6bufs, &taddr6),
303 ifp->if_addrlen, lladdrlen - 2));
307 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
308 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
309 ip6_sprintf(ip6bufs, &saddr6)));
314 * We have neighbor solicitation packet, with target address equals to
315 * one of my tentative address.
317 * src addr how to process?
319 * multicast of course, invalid (rejected in ip6_input)
320 * unicast somebody is doing address resolution -> ignore
321 * unspec dup address detection
323 * The processing is defined in RFC 2462.
327 * If source address is unspecified address, it is for
328 * duplicate address detection.
330 * If not, the packet is for addess resolution;
331 * silently ignore it.
333 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
334 nd6_dad_ns_input(ifa, ndopts.nd_opts_nonce);
340 * If the source address is unspecified address, entries must not
341 * be created or updated.
342 * It looks that sender is performing DAD. Output NA toward
343 * all-node multicast address, to tell the sender that I'm using
345 * S bit ("solicited") must be zero.
347 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
348 struct in6_addr in6_all;
350 in6_all = in6addr_linklocal_allnodes;
351 if (in6_setscope(&in6_all, ifp, NULL) != 0)
353 nd6_na_output_fib(ifp, &in6_all, &taddr6,
354 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
355 rflag, tlladdr, proxy ? (struct sockaddr *)&proxydl : NULL,
360 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen,
361 ND_NEIGHBOR_SOLICIT, 0);
363 nd6_na_output_fib(ifp, &saddr6, &taddr6,
364 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
365 rflag | ND_NA_FLAG_SOLICITED, tlladdr,
366 proxy ? (struct sockaddr *)&proxydl : NULL, M_GETFIB(m));
374 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n",
375 ip6_sprintf(ip6bufs, &saddr6)));
376 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n",
377 ip6_sprintf(ip6bufs, &daddr6)));
378 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n",
379 ip6_sprintf(ip6bufs, &taddr6)));
380 ICMP6STAT_INC(icp6s_badns);
387 * Output a Neighbor Solicitation Message. Caller specifies:
388 * - ICMP6 header source IP6 address
389 * - ND6 header target IP6 address
390 * - ND6 header source datalink address
393 * Based on RFC 2462 (duplicate address detection)
395 * ln - for source address determination
396 * nonce - If non-NULL, NS is used for duplicate address detection and
397 * the value (length is ND_OPT_NONCE_LEN) is used as a random nonce.
400 nd6_ns_output_fib(struct ifnet *ifp, const struct in6_addr *saddr6,
401 const struct in6_addr *daddr6, const struct in6_addr *taddr6,
402 uint8_t *nonce, u_int fibnum)
407 struct nd_neighbor_solicit *nd_ns;
408 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 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
432 m->m_flags |= M_MCAST;
433 im6o.im6o_multicast_ifp = ifp;
434 im6o.im6o_multicast_hlim = 255;
435 im6o.im6o_multicast_loop = 0;
438 icmp6len = sizeof(*nd_ns);
439 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
440 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
442 /* fill neighbor solicitation packet */
443 ip6 = mtod(m, struct ip6_hdr *);
445 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
446 ip6->ip6_vfc |= IPV6_VERSION;
447 /* ip6->ip6_plen will be set later */
448 ip6->ip6_nxt = IPPROTO_ICMPV6;
451 ip6->ip6_dst = *daddr6;
453 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
454 ip6->ip6_dst.s6_addr16[1] = 0;
455 ip6->ip6_dst.s6_addr32[1] = 0;
456 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
457 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
458 ip6->ip6_dst.s6_addr8[12] = 0xff;
459 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
463 struct ifaddr *ifa = NULL;
467 * "If the source address of the packet prompting the
468 * solicitation is the same as one of the addresses assigned
469 * to the outgoing interface, that address SHOULD be placed
470 * in the IP Source Address of the outgoing solicitation.
471 * Otherwise, any one of the addresses assigned to the
472 * interface should be used."
474 * We use the source address for the prompting packet
475 * (saddr6), if saddr6 belongs to the outgoing interface.
476 * Otherwise, we perform the source address selection as usual.
480 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, saddr6);
482 /* ip6_src set already. */
483 ip6->ip6_src = *saddr6;
487 struct in6_addr dst6, src6;
490 in6_splitscope(&ip6->ip6_dst, &dst6, &scopeid);
491 error = in6_selectsrc_addr(fibnum, &dst6,
492 scopeid, ifp, &src6, NULL);
494 char ip6buf[INET6_ADDRSTRLEN];
495 nd6log((LOG_DEBUG, "%s: source can't be "
496 "determined: dst=%s, error=%d\n", __func__,
497 ip6_sprintf(ip6buf, &dst6),
505 * Source address for DAD packet must always be IPv6
506 * unspecified address. (0::0)
507 * We actually don't have to 0-clear the address (we did it
508 * above), but we do so here explicitly to make the intention
511 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
513 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
514 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
515 nd_ns->nd_ns_code = 0;
516 nd_ns->nd_ns_reserved = 0;
517 nd_ns->nd_ns_target = *taddr6;
518 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */
521 * Add source link-layer address option.
523 * spec implementation
525 * DAD packet MUST NOT do not add the option
526 * there's no link layer address:
527 * impossible do not add the option
528 * there's link layer address:
529 * Multicast NS MUST add one add the option
530 * Unicast NS SHOULD add one add the option
532 if (nonce == NULL && (mac = nd6_ifptomac(ifp))) {
533 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
534 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
535 /* 8 byte alignments... */
536 optlen = (optlen + 7) & ~7;
538 m->m_pkthdr.len += optlen;
541 bzero((caddr_t)nd_opt, optlen);
542 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
543 nd_opt->nd_opt_len = optlen >> 3;
544 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
547 * Add a Nonce option (RFC 3971) to detect looped back NS messages.
548 * This behavior is documented as Enhanced Duplicate Address
549 * Detection in RFC 7527.
550 * net.inet6.ip6.dad_enhanced=0 disables this.
552 if (V_dad_enhanced != 0 && nonce != NULL) {
553 int optlen = sizeof(struct nd_opt_hdr) + ND_OPT_NONCE_LEN;
554 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
555 /* 8-byte alignment is required. */
556 optlen = (optlen + 7) & ~7;
558 m->m_pkthdr.len += optlen;
561 bzero((caddr_t)nd_opt, optlen);
562 nd_opt->nd_opt_type = ND_OPT_NONCE;
563 nd_opt->nd_opt_len = optlen >> 3;
564 bcopy(nonce, (caddr_t)(nd_opt + 1), ND_OPT_NONCE_LEN);
566 ip6->ip6_plen = htons((u_short)icmp6len);
567 nd_ns->nd_ns_cksum = 0;
569 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
571 if (send_sendso_input_hook != NULL) {
572 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
573 sizeof(unsigned short), M_NOWAIT);
576 *(unsigned short *)(mtag + 1) = nd_ns->nd_ns_type;
577 m_tag_prepend(m, mtag);
580 ip6_output(m, NULL, NULL, (nonce != NULL) ? IPV6_UNSPECSRC : 0,
582 icmp6_ifstat_inc(ifp, ifs6_out_msg);
583 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit);
584 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_SOLICIT]);
594 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *saddr6,
595 const struct in6_addr *daddr6, const struct in6_addr *taddr6,uint8_t *nonce)
598 nd6_ns_output_fib(ifp, saddr6, daddr6, taddr6, nonce, RT_DEFAULT_FIB);
602 * Neighbor advertisement input handling.
605 * Based on RFC 2462 (duplicate address detection)
607 * the following items are not implemented yet:
608 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
609 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
612 nd6_na_input(struct mbuf *m, int off, int icmp6len)
614 struct ifnet *ifp = m->m_pkthdr.rcvif;
615 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
616 struct nd_neighbor_advert *nd_na;
617 struct in6_addr daddr6 = ip6->ip6_dst;
618 struct in6_addr taddr6;
627 struct llentry *ln = NULL;
628 union nd_opts ndopts;
629 struct mbuf *chain = NULL;
630 struct sockaddr_in6 sin6;
631 u_char linkhdr[LLE_MAX_LINKHDR];
634 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
636 /* RFC 6980: Nodes MUST silently ignore fragments */
637 if(m->m_flags & M_FRAGMENTED)
640 if (ip6->ip6_hlim != 255) {
642 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
643 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src),
644 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp)));
648 #ifndef PULLDOWN_TEST
649 IP6_EXTHDR_CHECK(m, off, icmp6len,);
650 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
652 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
654 ICMP6STAT_INC(icp6s_tooshort);
659 flags = nd_na->nd_na_flags_reserved;
660 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
661 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
662 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
663 memset(&sin6, 0, sizeof(sin6));
665 taddr6 = nd_na->nd_na_target;
666 if (in6_setscope(&taddr6, ifp, NULL))
667 goto bad; /* XXX: impossible */
669 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
671 "nd6_na_input: invalid target address %s\n",
672 ip6_sprintf(ip6bufs, &taddr6)));
675 if (IN6_IS_ADDR_MULTICAST(&daddr6))
678 "nd6_na_input: a solicited adv is multicasted\n"));
682 icmp6len -= sizeof(*nd_na);
683 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
684 if (nd6_options(&ndopts) < 0) {
686 "nd6_na_input: invalid ND option, ignored\n"));
687 /* nd6_options have incremented stats */
691 if (ndopts.nd_opts_tgt_lladdr) {
692 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
693 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
697 * This effectively disables the DAD check on a non-master CARP
701 ifa = (*carp_iamatch6_p)(ifp, &taddr6);
703 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
706 * Target address matches one of my interface address.
708 * If my address is tentative, this means that there's somebody
709 * already using the same address as mine. This indicates DAD failure.
710 * This is defined in RFC 2462.
712 * Otherwise, process as defined in RFC 2461.
715 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
716 nd6_dad_na_input(ifa);
721 /* Just for safety, maybe unnecessary. */
725 "nd6_na_input: duplicate IP6 address %s\n",
726 ip6_sprintf(ip6bufs, &taddr6));
730 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
731 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
732 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6),
733 ifp->if_addrlen, lladdrlen - 2));
738 * If no neighbor cache entry is found, NA SHOULD silently be
741 IF_AFDATA_RLOCK(ifp);
742 ln = nd6_lookup(&taddr6, LLE_EXCLUSIVE, ifp);
743 IF_AFDATA_RUNLOCK(ifp);
748 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
750 * If the link-layer has address, and no lladdr option came,
751 * discard the packet.
753 if (ifp->if_addrlen && lladdr == NULL) {
758 * Record link-layer address, and update the state.
760 linkhdrsize = sizeof(linkhdr);
761 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
762 linkhdr, &linkhdrsize, &lladdr_off) != 0)
765 if (lltable_try_set_entry_addr(ifp, ln, linkhdr, linkhdrsize,
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 linkhdrsize = sizeof(linkhdr);
836 if (lltable_calc_llheader(ifp, AF_INET6, lladdr,
837 linkhdr, &linkhdrsize, &lladdr_off) != 0)
839 if (lltable_try_set_entry_addr(ifp, ln, linkhdr,
840 linkhdrsize, lladdr_off) == 0) {
844 EVENTHANDLER_INVOKE(lle_event, ln,
849 * If solicited, make the state REACHABLE.
850 * If not solicited and the link-layer address was
851 * changed, make it STALE.
854 nd6_llinfo_setstate(ln, ND6_LLINFO_REACHABLE);
856 if (lladdr != NULL && llchange)
857 nd6_llinfo_setstate(ln, ND6_LLINFO_STALE);
861 if (ln->ln_router && !is_router) {
863 * The peer dropped the router flag.
864 * Remove the sender from the Default Router List and
865 * update the Destination Cache entries.
867 struct ifnet *nd6_ifp;
869 nd6_ifp = lltable_get_ifp(ln->lle_tbl);
870 if (!defrouter_remove(&ln->r_l3addr.addr6, nd6_ifp) &&
871 (ND_IFINFO(nd6_ifp)->flags &
872 ND6_IFF_ACCEPT_RTADV) != 0)
874 * Even if the neighbor is not in the default
875 * router list, the neighbor may be used as a
876 * next hop for some destinations (e.g. redirect
877 * case). So we must call rt6_flush explicitly.
879 rt6_flush(&ip6->ip6_src, ifp);
881 ln->ln_router = is_router;
885 * rt->rt_flags &= ~RTF_REJECT;
888 if (ln->la_hold != NULL)
889 nd6_grab_holdchain(ln, &chain, &sin6);
895 nd6_flush_holdchain(ifp, ifp, chain, &sin6);
898 pfxlist_onlink_check();
907 ICMP6STAT_INC(icp6s_badna);
912 * Neighbor advertisement output handling.
916 * the following items are not implemented yet:
917 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
918 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
920 * tlladdr - 1 if include target link-layer address
921 * sdl0 - sockaddr_dl (= proxy NA) or NULL
924 nd6_na_output_fib(struct ifnet *ifp, const struct in6_addr *daddr6_0,
925 const struct in6_addr *taddr6, u_long flags, int tlladdr,
926 struct sockaddr *sdl0, u_int fibnum)
931 struct nd_neighbor_advert *nd_na;
932 struct ip6_moptions im6o;
933 struct in6_addr daddr6, dst6, src6;
936 int icmp6len, maxlen, error;
939 daddr6 = *daddr6_0; /* make a local copy for modification */
941 /* estimate the size of message */
942 maxlen = sizeof(*ip6) + sizeof(*nd_na);
943 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
944 KASSERT(max_linkhdr + maxlen <= MCLBYTES, (
945 "%s: max_linkhdr + maxlen > MCLBYTES (%d + %d > %d)",
946 __func__, max_linkhdr, maxlen, MCLBYTES));
948 if (max_linkhdr + maxlen > MHLEN)
949 m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
951 m = m_gethdr(M_NOWAIT, MT_DATA);
956 if (IN6_IS_ADDR_MULTICAST(&daddr6)) {
957 m->m_flags |= M_MCAST;
958 im6o.im6o_multicast_ifp = ifp;
959 im6o.im6o_multicast_hlim = 255;
960 im6o.im6o_multicast_loop = 0;
963 icmp6len = sizeof(*nd_na);
964 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
965 m->m_data += max_linkhdr; /* or M_ALIGN() equivalent? */
967 /* fill neighbor advertisement packet */
968 ip6 = mtod(m, struct ip6_hdr *);
970 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
971 ip6->ip6_vfc |= IPV6_VERSION;
972 ip6->ip6_nxt = IPPROTO_ICMPV6;
974 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) {
976 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
977 daddr6.s6_addr16[1] = 0;
978 daddr6.s6_addr32[1] = 0;
979 daddr6.s6_addr32[2] = 0;
980 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
981 if (in6_setscope(&daddr6, ifp, NULL))
984 flags &= ~ND_NA_FLAG_SOLICITED;
986 ip6->ip6_dst = daddr6;
989 * Select a source whose scope is the same as that of the dest.
991 in6_splitscope(&daddr6, &dst6, &scopeid);
992 error = in6_selectsrc_addr(fibnum, &dst6,
993 scopeid, ifp, &src6, NULL);
995 char ip6buf[INET6_ADDRSTRLEN];
996 nd6log((LOG_DEBUG, "nd6_na_output: source can't be "
997 "determined: dst=%s, error=%d\n",
998 ip6_sprintf(ip6buf, &daddr6), error));
1001 ip6->ip6_src = src6;
1002 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
1003 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
1004 nd_na->nd_na_code = 0;
1005 nd_na->nd_na_target = *taddr6;
1006 in6_clearscope(&nd_na->nd_na_target); /* XXX */
1009 * "tlladdr" indicates NS's condition for adding tlladdr or not.
1010 * see nd6_ns_input() for details.
1011 * Basically, if NS packet is sent to unicast/anycast addr,
1012 * target lladdr option SHOULD NOT be included.
1016 * sdl0 != NULL indicates proxy NA. If we do proxy, use
1017 * lladdr in sdl0. If we are not proxying (sending NA for
1018 * my address) use lladdr configured for the interface.
1022 mac = (*carp_macmatch6_p)(ifp, m, taddr6);
1024 mac = nd6_ifptomac(ifp);
1025 } else if (sdl0->sa_family == AF_LINK) {
1026 struct sockaddr_dl *sdl;
1027 sdl = (struct sockaddr_dl *)sdl0;
1028 if (sdl->sdl_alen == ifp->if_addrlen)
1032 if (tlladdr && mac) {
1033 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
1034 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
1036 /* roundup to 8 bytes alignment! */
1037 optlen = (optlen + 7) & ~7;
1039 m->m_pkthdr.len += optlen;
1042 bzero((caddr_t)nd_opt, optlen);
1043 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1044 nd_opt->nd_opt_len = optlen >> 3;
1045 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1047 flags &= ~ND_NA_FLAG_OVERRIDE;
1049 ip6->ip6_plen = htons((u_short)icmp6len);
1050 nd_na->nd_na_flags_reserved = flags;
1051 nd_na->nd_na_cksum = 0;
1052 nd_na->nd_na_cksum =
1053 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1055 if (send_sendso_input_hook != NULL) {
1056 mtag = m_tag_get(PACKET_TAG_ND_OUTGOING,
1057 sizeof(unsigned short), M_NOWAIT);
1060 *(unsigned short *)(mtag + 1) = nd_na->nd_na_type;
1061 m_tag_prepend(m, mtag);
1064 ip6_output(m, NULL, NULL, 0, &im6o, NULL, NULL);
1065 icmp6_ifstat_inc(ifp, ifs6_out_msg);
1066 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert);
1067 ICMP6STAT_INC(icp6s_outhist[ND_NEIGHBOR_ADVERT]);
1075 #ifndef BURN_BRIDGES
1077 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0,
1078 const struct in6_addr *taddr6, u_long flags, int tlladdr,
1079 struct sockaddr *sdl0)
1082 nd6_na_output_fib(ifp, daddr6_0, taddr6, flags, tlladdr, sdl0,
1088 nd6_ifptomac(struct ifnet *ifp)
1090 switch (ifp->if_type) {
1097 case IFT_INFINIBAND:
1100 return IF_LLADDR(ifp);
1107 TAILQ_ENTRY(dadq) dad_list;
1108 struct ifaddr *dad_ifa;
1109 int dad_count; /* max NS to send */
1110 int dad_ns_tcount; /* # of trials to send NS */
1111 int dad_ns_ocount; /* NS sent so far */
1114 int dad_ns_lcount; /* looped back NS */
1115 int dad_loopbackprobe; /* probing state for loopback detection */
1116 struct callout dad_timer_ch;
1117 struct vnet *dad_vnet;
1119 #define ND_OPT_NONCE_LEN32 \
1120 ((ND_OPT_NONCE_LEN + sizeof(uint32_t) - 1)/sizeof(uint32_t))
1121 uint32_t dad_nonce[ND_OPT_NONCE_LEN32];
1122 bool dad_ondadq; /* on dadq? Protected by DADQ_WLOCK. */
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);
1141 dp->dad_ondadq = true;
1146 nd6_dad_del(struct dadq *dp)
1150 if (dp->dad_ondadq) {
1152 * Remove dp from the dadq and release the dadq's
1155 TAILQ_REMOVE(&V_dadq, dp, dad_list);
1156 dp->dad_ondadq = false;
1163 static struct dadq *
1164 nd6_dad_find(struct ifaddr *ifa, struct nd_opt_nonce *n)
1169 TAILQ_FOREACH(dp, &V_dadq, dad_list) {
1170 if (dp->dad_ifa != ifa)
1173 * Skip if the nonce matches the received one.
1174 * +2 in the length is required because of type and
1175 * length fields are included in a header.
1178 n->nd_opt_nonce_len == (ND_OPT_NONCE_LEN + 2) / 8 &&
1179 memcmp(&n->nd_opt_nonce[0], &dp->dad_nonce[0],
1180 ND_OPT_NONCE_LEN) == 0) {
1181 dp->dad_ns_lcount++;
1184 refcount_acquire(&dp->dad_refcnt);
1193 nd6_dad_starttimer(struct dadq *dp, int ticks, int send_ns)
1197 nd6_dad_ns_output(dp);
1198 callout_reset(&dp->dad_timer_ch, ticks,
1199 (void (*)(void *))nd6_dad_timer, (void *)dp);
1203 nd6_dad_stoptimer(struct dadq *dp)
1206 callout_drain(&dp->dad_timer_ch);
1210 nd6_dad_rele(struct dadq *dp)
1213 if (refcount_release(&dp->dad_refcnt)) {
1214 ifa_free(dp->dad_ifa);
1223 rw_init(&V_dad_rwlock, "nd6 DAD queue");
1224 TAILQ_INIT(&V_dadq);
1228 * Start Duplicate Address Detection (DAD) for specified interface address.
1231 nd6_dad_start(struct ifaddr *ifa, int delay)
1233 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1235 char ip6buf[INET6_ADDRSTRLEN];
1238 * If we don't need DAD, don't do it.
1239 * There are several cases:
1240 * - DAD is disabled (ip6_dad_count == 0)
1241 * - the interface address is anycast
1243 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1245 "nd6_dad_start: called with non-tentative address "
1247 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1248 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1251 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1252 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1255 if (!V_ip6_dad_count) {
1256 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1259 if (ifa->ifa_ifp == NULL)
1260 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1261 if (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_NO_DAD) {
1262 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1265 if (!(ifa->ifa_ifp->if_flags & IFF_UP) ||
1266 !(ifa->ifa_ifp->if_drv_flags & IFF_DRV_RUNNING) ||
1267 (ND_IFINFO(ifa->ifa_ifp)->flags & ND6_IFF_IFDISABLED)) {
1268 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1271 if ((dp = nd6_dad_find(ifa, NULL)) != NULL) {
1273 * DAD is already in progress. Let the existing entry
1280 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO);
1282 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1284 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1285 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1288 callout_init(&dp->dad_timer_ch, 0);
1290 dp->dad_vnet = curvnet;
1292 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1293 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1296 * Send NS packet for DAD, ip6_dad_count times.
1297 * Note that we must delay the first transmission, if this is the
1298 * first packet to be sent from the interface after interface
1299 * (re)initialization.
1302 ifa_ref(dp->dad_ifa);
1303 dp->dad_count = V_ip6_dad_count;
1304 dp->dad_ns_icount = dp->dad_na_icount = 0;
1305 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1306 dp->dad_ns_lcount = dp->dad_loopbackprobe = 0;
1308 /* Add this to the dadq and add a reference for the dadq. */
1309 refcount_init(&dp->dad_refcnt, 1);
1311 nd6_dad_starttimer(dp, delay, 0);
1315 * terminate DAD unconditionally. used for address removals.
1318 nd6_dad_stop(struct ifaddr *ifa)
1322 dp = nd6_dad_find(ifa, NULL);
1324 /* DAD wasn't started yet */
1328 nd6_dad_stoptimer(dp);
1331 /* Release this function's reference, acquired by nd6_dad_find(). */
1336 nd6_dad_timer(struct dadq *dp)
1338 CURVNET_SET(dp->dad_vnet);
1339 struct ifaddr *ifa = dp->dad_ifa;
1340 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1341 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1342 char ip6buf[INET6_ADDRSTRLEN];
1346 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1349 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1350 /* Do not need DAD for ifdisabled interface. */
1351 log(LOG_ERR, "nd6_dad_timer: cancel DAD on %s because of "
1352 "ND6_IFF_IFDISABLED.\n", ifp->if_xname);
1355 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1356 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1358 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1359 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1362 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1363 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1365 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1366 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1370 /* Stop DAD if the interface is down even after dad_maxtry attempts. */
1371 if ((dp->dad_ns_tcount > V_dad_maxtry) &&
1372 (((ifp->if_flags & IFF_UP) == 0) ||
1373 ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0))) {
1374 nd6log((LOG_INFO, "%s: could not run DAD "
1375 "because the interface was down or not running.\n",
1376 if_name(ifa->ifa_ifp)));
1380 /* Need more checks? */
1381 if (dp->dad_ns_ocount < dp->dad_count) {
1383 * We have more NS to go. Send NS packet for DAD.
1385 nd6_dad_starttimer(dp,
1386 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000, 1);
1390 * We have transmitted sufficient number of DAD packets.
1391 * See what we've got.
1393 if (dp->dad_ns_icount > 0 || dp->dad_na_icount > 0)
1394 /* We've seen NS or NA, means DAD has failed. */
1395 nd6_dad_duplicated(ifa, dp);
1396 else if (V_dad_enhanced != 0 &&
1397 dp->dad_ns_lcount > 0 &&
1398 dp->dad_ns_lcount > dp->dad_loopbackprobe) {
1400 * Sec. 4.1 in RFC 7527 requires transmission of
1401 * additional probes until the loopback condition
1402 * becomes clear when a looped back probe is detected.
1404 log(LOG_ERR, "%s: a looped back NS message is "
1405 "detected during DAD for %s. "
1406 "Another DAD probes are being sent.\n",
1407 if_name(ifa->ifa_ifp),
1408 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1409 dp->dad_loopbackprobe = dp->dad_ns_lcount;
1411 * Send an NS immediately and increase dad_count by
1412 * V_nd6_mmaxtries - 1.
1415 dp->dad_ns_ocount + V_nd6_mmaxtries - 1;
1416 nd6_dad_starttimer(dp,
1417 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000,
1422 * We are done with DAD. No NA came, no NS came.
1423 * No duplicate address found. Check IFDISABLED flag
1424 * again in case that it is changed between the
1425 * beginning of this function and here.
1427 if ((ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) == 0)
1428 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1431 "%s: DAD complete for %s - no duplicates found\n",
1432 if_name(ifa->ifa_ifp),
1433 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1434 if (dp->dad_ns_lcount > 0)
1435 log(LOG_ERR, "%s: DAD completed while "
1436 "a looped back NS message is detected "
1437 "during DAD for %s.\n",
1438 if_name(ifa->ifa_ifp),
1439 ip6_sprintf(ip6buf, IFA_IN6(ifa)));
1449 nd6_dad_duplicated(struct ifaddr *ifa, struct dadq *dp)
1451 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1453 char ip6buf[INET6_ADDRSTRLEN];
1455 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1456 "NS in/out/loopback=%d/%d/%d, NA in=%d\n",
1457 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr),
1458 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_ns_lcount,
1461 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1462 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1465 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1466 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr));
1467 log(LOG_ERR, "%s: manual intervention required\n",
1471 * If the address is a link-local address formed from an interface
1472 * identifier based on the hardware address which is supposed to be
1473 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP
1474 * operation on the interface SHOULD be disabled.
1475 * [RFC 4862, Section 5.4.5]
1477 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) {
1478 struct in6_addr in6;
1481 * To avoid over-reaction, we only apply this logic when we are
1482 * very sure that hardware addresses are supposed to be unique.
1484 switch (ifp->if_type) {
1490 case IFT_INFINIBAND:
1491 in6 = ia->ia_addr.sin6_addr;
1492 if (in6_get_hw_ifid(ifp, &in6) == 0 &&
1493 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) {
1494 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED;
1495 log(LOG_ERR, "%s: possible hardware address "
1496 "duplication detected, disable IPv6\n",
1505 nd6_dad_ns_output(struct dadq *dp)
1507 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1508 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1511 dp->dad_ns_tcount++;
1512 if ((ifp->if_flags & IFF_UP) == 0) {
1515 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1519 dp->dad_ns_ocount++;
1520 if (V_dad_enhanced != 0) {
1521 for (i = 0; i < ND_OPT_NONCE_LEN32; i++)
1522 dp->dad_nonce[i] = arc4random();
1524 * XXXHRS: Note that in the case that
1525 * DupAddrDetectTransmits > 1, multiple NS messages with
1526 * different nonces can be looped back in an unexpected
1527 * order. The current implementation recognizes only
1528 * the latest nonce on the sender side. Practically it
1529 * should work well in almost all cases.
1532 nd6_ns_output(ifp, NULL, NULL, &ia->ia_addr.sin6_addr,
1533 (uint8_t *)&dp->dad_nonce[0]);
1537 nd6_dad_ns_input(struct ifaddr *ifa, struct nd_opt_nonce *ndopt_nonce)
1539 struct in6_ifaddr *ia;
1541 const struct in6_addr *taddr6;
1545 panic("ifa == NULL in nd6_dad_ns_input");
1547 ia = (struct in6_ifaddr *)ifa;
1549 taddr6 = &ia->ia_addr.sin6_addr;
1550 /* Ignore Nonce option when Enhanced DAD is disabled. */
1551 if (V_dad_enhanced == 0)
1553 dp = nd6_dad_find(ifa, ndopt_nonce);
1557 dp->dad_ns_icount++;
1562 nd6_dad_na_input(struct ifaddr *ifa)
1567 panic("ifa == NULL in nd6_dad_na_input");
1569 dp = nd6_dad_find(ifa, NULL);
1571 dp->dad_na_icount++;