1 /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.6 2003/01/23 21:06:47 sam Exp $ */
2 /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include "opt_inet6.h"
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
44 #include <sys/kernel.h>
45 #include <sys/errno.h>
46 #include <sys/syslog.h>
47 #include <sys/queue.h>
48 #include <sys/callout.h>
49 #include <sys/mutex.h>
51 #include <sys/thread2.h>
52 #include <sys/mutex2.h>
55 #include <net/if_types.h>
56 #include <net/if_dl.h>
57 #include <net/route.h>
58 #include <net/netisr2.h>
59 #include <net/netmsg2.h>
61 #include <netinet/in.h>
62 #include <netinet/in_var.h>
63 #include <netinet6/in6_var.h>
64 #include <netinet/ip6.h>
65 #include <netinet6/ip6_var.h>
66 #include <netinet6/nd6.h>
67 #include <netinet/icmp6.h>
69 #include <net/net_osdep.h>
72 #include <netinet/ip_carp.h>
76 #define SDL(s) ((struct sockaddr_dl *)s)
79 static struct dadq *nd6_dad_find(struct ifaddr *);
80 static void nd6_dad_starttimer(struct dadq *, int);
81 static void nd6_dad_stoptimer(struct dadq *);
82 static void nd6_dad_timer(void *);
83 static void nd6_dad_timer_handler(netmsg_t);
84 static void nd6_dad_ns_output(struct dadq *);
85 static void nd6_dad_ns_input(struct ifaddr *);
86 static void nd6_dad_na_input(struct ifaddr *);
87 static struct dadq *nd6_dad_create(struct ifaddr *);
88 static void nd6_dad_destroy(struct dadq *);
89 static void nd6_dad_duplicated(struct ifaddr *);
91 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
92 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
95 * Input an Neighbor Solicitation Message.
98 * Based on RFC 2462 (duplicated address detection)
101 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
103 struct ifnet *ifp = m->m_pkthdr.rcvif;
104 struct ifnet *cmpifp;
105 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
106 struct nd_neighbor_solicit *nd_ns;
107 struct in6_addr saddr6 = ip6->ip6_src;
108 struct in6_addr daddr6 = ip6->ip6_dst;
109 struct in6_addr taddr6;
110 struct in6_addr myaddr6;
112 struct ifaddr *ifa = NULL;
114 int anycast = 0, proxy = 0, tentative = 0;
116 union nd_opts ndopts;
117 struct sockaddr_dl *proxydl = NULL;
120 * Collapse interfaces to the bridge for comparison and
121 * mac (llinfo) purposes.
125 cmpifp = ifp->if_bridge;
127 #ifndef PULLDOWN_TEST
128 IP6_EXTHDR_CHECK(m, off, icmp6len,);
129 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
131 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
133 icmp6stat.icp6s_tooshort++;
137 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
138 taddr6 = nd_ns->nd_ns_target;
140 if (ip6->ip6_hlim != 255) {
142 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
143 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
144 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
148 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
149 /* dst has to be solicited node multicast address. */
150 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
151 /* don't check ifindex portion */
152 daddr6.s6_addr32[1] == 0 &&
153 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
154 daddr6.s6_addr8[12] == 0xff) {
157 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
158 "(wrong ip6 dst)\n"));
161 } else if (!nd6_onlink_ns_rfc4861) {
163 * Make sure the source address is from a neighbor's address.
165 * XXX probably only need to check cmpifp.
167 if (in6ifa_ifplocaladdr(cmpifp, &saddr6) == NULL &&
168 in6ifa_ifplocaladdr(ifp, &saddr6) == NULL) {
169 nd6log((LOG_INFO, "nd6_ns_input: "
170 "NS packet from non-neighbor\n"));
175 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
176 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
180 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
181 taddr6.s6_addr16[1] = htons(ifp->if_index);
183 icmp6len -= sizeof(*nd_ns);
184 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
185 if (nd6_options(&ndopts) < 0) {
187 "nd6_ns_input: invalid ND option, ignored\n"));
188 /* nd6_options have incremented stats */
192 if (ndopts.nd_opts_src_lladdr) {
193 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
194 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
197 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
198 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
199 "(link-layer address option)\n"));
204 * Attaching target link-layer address to the NA?
207 * NS IP dst is unicast/anycast MUST NOT add
208 * NS IP dst is solicited-node multicast MUST add
210 * In implementation, we add target link-layer address by default.
211 * We do not add one in MUST NOT cases.
213 #if 0 /* too much! */
214 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
215 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
219 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
225 * Target address (taddr6) must be either:
226 * (1) Valid unicast/anycast address for my receiving interface.
227 * (2) Unicast or anycast address for which I'm offering proxy
229 * (3) "tentative" address on which DAD is being performed.
231 /* (1) and (3) check. */
234 ifa = carp_iamatch6(ifp->if_carp, &taddr6);
236 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
238 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
242 * (2) Check proxying. Requires ip6_forwarding to be turned on.
244 * If the packet is anycast the target route must be on a
245 * different interface because the anycast will get anything
246 * on the current interface.
248 * If the packet is unicast the target route may be on the
249 * same interface. If the gateway is a (typically manually
250 * configured) link address we can directly offer it.
251 * XXX for now we don't do this but instead offer ours and
254 * WARNING! Since this is a subnet proxy the interface proxying
255 * the ND6 must be in promiscuous mode or it will not see the
256 * solicited multicast requests for various hosts being proxied.
258 * WARNING! Since this is a subnet proxy we have to treat bridge
259 * interfaces as being the bridge itself so we do not proxy-nd6
260 * between bridge interfaces (which are effectively switched).
262 * (In the specific-host-proxy case via RTF_ANNOUNCE, which is
263 * a bitch to configure, a specific multicast route is already
264 * added for that host <-- NOT RECOMMENDED).
266 if (!ifa && ip6_forwarding) {
268 struct sockaddr_in6 tsin6;
271 bzero(&tsin6, sizeof tsin6);
272 tsin6.sin6_len = sizeof(struct sockaddr_in6);
273 tsin6.sin6_family = AF_INET6;
274 tsin6.sin6_addr = taddr6;
276 rt = rtpurelookup((struct sockaddr *)&tsin6);
277 rtifp = rt ? rt->rt_ifp : NULL;
278 if (rtifp && rtifp->if_bridge)
279 rtifp = rtifp->if_bridge;
282 (cmpifp != rtifp || (m->m_flags & M_MCAST) == 0)) {
283 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(cmpifp,
284 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
286 "nd6_ns_input: nd6 proxy %s(%s)<-%s ifa %p\n",
287 if_name(cmpifp), if_name(ifp),
288 if_name(rtifp), ifa));
292 * Manual link address on same interface
293 * w/announce flag will proxy-arp using
294 * target mac, else our mac is used.
296 if (cmpifp == rtifp &&
297 (rt->rt_flags & RTF_ANNOUNCE) &&
298 rt->rt_gateway->sa_family == AF_LINK) {
299 proxydl = SDL(rt->rt_gateway);
308 * We've got an NS packet, and we don't have that adddress
309 * assigned for us. We MUST silently ignore it.
314 myaddr6 = *IFA_IN6(ifa);
315 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
316 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
317 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
320 if (lladdr && ((cmpifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
321 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
322 "(if %d, NS packet %d)\n",
323 ip6_sprintf(&taddr6), cmpifp->if_addrlen, lladdrlen - 2));
327 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
328 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
329 ip6_sprintf(&saddr6)));
334 * We have neighbor solicitation packet, with target address equals to
335 * one of my tentative address.
337 * src addr how to process?
339 * multicast of course, invalid (rejected in ip6_input)
340 * unicast somebody is doing address resolution -> ignore
341 * unspec dup address detection
343 * The processing is defined in RFC 2462.
347 * If source address is unspecified address, it is for
348 * duplicated address detection.
350 * If not, the packet is for addess resolution;
351 * silently ignore it.
353 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
354 nd6_dad_ns_input(ifa);
360 * If the source address is unspecified address, entries must not
361 * be created or updated.
362 * It looks that sender is performing DAD. Output NA toward
363 * all-node multicast address, to tell the sender that I'm using
365 * S bit ("solicited") must be zero.
367 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
368 saddr6 = kin6addr_linklocal_allnodes;
369 saddr6.s6_addr16[1] = htons(cmpifp->if_index);
370 nd6_na_output(cmpifp, &saddr6, &taddr6,
371 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
372 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
373 tlladdr, (struct sockaddr *)proxydl);
377 nd6_cache_lladdr(cmpifp, &saddr6, lladdr, lladdrlen,
378 ND_NEIGHBOR_SOLICIT, 0);
380 nd6_na_output(ifp, &saddr6, &taddr6,
381 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
382 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
383 tlladdr, (struct sockaddr *)proxydl);
389 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
390 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
391 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
392 icmp6stat.icp6s_badns++;
397 * Output an Neighbor Solicitation Message. Caller specifies:
398 * - ICMP6 header source IP6 address
399 * - ND6 header target IP6 address
400 * - ND6 header source datalink address
403 * Based on RFC 2462 (duplicated address detection)
406 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
407 const struct in6_addr *taddr6,
408 struct llinfo_nd6 *ln, /* for source address determination */
409 int dad) /* duplicated address detection */
413 struct nd_neighbor_solicit *nd_ns;
414 struct in6_ifaddr *ia = NULL;
415 struct ip6_moptions im6o;
419 struct ifnet *outif = NULL;
421 if (IN6_IS_ADDR_MULTICAST(taddr6))
424 /* estimate the size of message */
425 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
426 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
427 if (max_linkhdr + maxlen > MCLBYTES) {
429 kprintf("nd6_ns_output: max_linkhdr + maxlen > MCLBYTES "
430 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
435 m = m_getb(max_linkhdr + maxlen, M_NOWAIT, MT_DATA, M_PKTHDR);
439 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
440 m->m_flags |= M_MCAST;
441 im6o.im6o_multicast_ifp = ifp;
442 im6o.im6o_multicast_hlim = 255;
443 im6o.im6o_multicast_loop = 0;
446 icmp6len = sizeof(*nd_ns);
447 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
448 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
450 /* fill neighbor solicitation packet */
451 ip6 = mtod(m, struct ip6_hdr *);
453 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
454 ip6->ip6_vfc |= IPV6_VERSION;
455 /* ip6->ip6_plen will be set later */
456 ip6->ip6_nxt = IPPROTO_ICMPV6;
459 ip6->ip6_dst = *daddr6;
461 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
462 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
463 ip6->ip6_dst.s6_addr32[1] = 0;
464 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
465 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
466 ip6->ip6_dst.s6_addr8[12] = 0xff;
471 * "If the source address of the packet prompting the
472 * solicitation is the same as one of the addresses assigned
473 * to the outgoing interface, that address SHOULD be placed
474 * in the IP Source Address of the outgoing solicitation.
475 * Otherwise, any one of the addresses assigned to the
476 * interface should be used."
478 * We use the source address for the prompting packet
480 * - saddr6 is given from the caller (by giving "ln"), and
481 * - saddr6 belongs to the outgoing interface.
482 * Otherwise, we perform a scope-wise match.
484 struct ip6_hdr *hip6; /* hold ip6 */
485 struct in6_addr *saddr6;
487 if (ln && ln->ln_hold) {
488 hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
490 if (sizeof(*hip6) < ln->ln_hold->m_len)
491 saddr6 = &hip6->ip6_src;
496 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
497 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
499 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
504 ip6->ip6_src = ia->ia_addr.sin6_addr;
508 * Source address for DAD packet must always be IPv6
509 * unspecified address. (0::0)
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 (!dad && (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 ip6->ip6_plen = htons((u_short)icmp6len);
548 nd_ns->nd_ns_cksum = 0;
550 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
552 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL);
554 icmp6_ifstat_inc(outif, ifs6_out_msg);
555 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
557 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
561 * Neighbor advertisement input handling.
564 * Based on RFC 2462 (duplicated address detection)
566 * the following items are not implemented yet:
567 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
568 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
571 nd6_na_input(struct mbuf *m, int off, int icmp6len)
573 struct ifnet *ifp = m->m_pkthdr.rcvif;
574 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
575 struct nd_neighbor_advert *nd_na;
576 struct in6_addr saddr6 = ip6->ip6_src;
577 struct in6_addr daddr6 = ip6->ip6_dst;
578 struct in6_addr taddr6;
586 struct llinfo_nd6 *ln;
588 struct sockaddr_dl *sdl;
589 union nd_opts ndopts;
591 if (ip6->ip6_hlim != 255) {
593 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
594 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
595 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
599 #ifndef PULLDOWN_TEST
600 IP6_EXTHDR_CHECK(m, off, icmp6len,);
601 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
603 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
605 icmp6stat.icp6s_tooshort++;
609 taddr6 = nd_na->nd_na_target;
610 flags = nd_na->nd_na_flags_reserved;
611 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
612 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
613 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
615 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
616 taddr6.s6_addr16[1] = htons(ifp->if_index);
618 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
620 "nd6_na_input: invalid target address %s\n",
621 ip6_sprintf(&taddr6)));
624 if (IN6_IS_ADDR_MULTICAST(&daddr6))
627 "nd6_na_input: a solicited adv is multicasted\n"));
631 icmp6len -= sizeof(*nd_na);
632 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
633 if (nd6_options(&ndopts) < 0) {
635 "nd6_na_input: invalid ND option, ignored\n"));
636 /* nd6_options have incremented stats */
640 if (ndopts.nd_opts_tgt_lladdr) {
641 struct ifnet *ifp_ll;
643 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
644 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
646 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
647 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch "
648 "for %s (if %d, NA packet %d)\n", ip6_sprintf(&taddr6),
649 ifp->if_addrlen, lladdrlen - 2));
653 /* If it's from me, ignore it. */
654 ifp_ll = if_bylla(lladdr, ifp->if_addrlen);
659 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
662 * Target address matches one of my interface address.
664 * If my address is tentative, this means that there's somebody
665 * already using the same address as mine. This indicates DAD failure.
666 * This is defined in RFC 2462.
668 * Otherwise, process as defined in RFC 2461.
671 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
672 nd6_dad_na_input(ifa);
676 /* Just for safety, maybe unnecessary. */
679 "nd6_na_input: duplicate IP6 address %s\n",
680 ip6_sprintf(&taddr6));
684 if (!nd6_onlink_ns_rfc4861) {
686 * Make sure the source address is from a neighbor's address.
688 if (in6ifa_ifplocaladdr(ifp, &saddr6) == NULL) {
689 nd6log((LOG_INFO, "nd6_na_input: "
690 "NA packet from non-neighbor\n"));
696 * If no neighbor cache entry is found, NA SHOULD silently be discarded.
698 rt = nd6_lookup(&taddr6, 0, ifp);
700 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
701 ((sdl = SDL(rt->rt_gateway)) == NULL))
704 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
706 * If the link-layer has address, and no lladdr option came,
707 * discard the packet.
709 if (ifp->if_addrlen && !lladdr)
713 * Record link-layer address, and update the state.
715 sdl->sdl_alen = ifp->if_addrlen;
716 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
718 ln->ln_state = ND6_LLINFO_REACHABLE;
721 ln->ln_expire = time_uptime +
722 ND_IFINFO(rt->rt_ifp)->reachable;
725 ln->ln_state = ND6_LLINFO_STALE;
726 ln->ln_expire = time_uptime + nd6_gctimer;
728 if ((ln->ln_router = is_router) != 0) {
730 * This means a router's state has changed from
731 * non-reachable to probably reachable, and might
732 * affect the status of associated prefixes..
734 pfxlist_onlink_check();
740 * Check if the link-layer address has changed or not.
746 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
755 * This is VERY complex. Look at it with care.
757 * override solicit lladdr llchange action
762 * 0 0 y y (1) REACHABLE->STALE
763 * 0 1 n -- (2c) *->REACHABLE
764 * 0 1 y n (2b) L *->REACHABLE
765 * 0 1 y y (1) REACHABLE->STALE
768 * 1 0 y y (2a) L *->STALE
769 * 1 1 n -- (2a) *->REACHABLE
770 * 1 1 y n (2a) L *->REACHABLE
771 * 1 1 y y (2a) L *->REACHABLE
773 if (!is_override && (lladdr && llchange)) { /* (1) */
775 * If state is REACHABLE, make it STALE.
776 * no other updates should be done.
778 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
779 ln->ln_state = ND6_LLINFO_STALE;
780 ln->ln_expire = time_uptime + nd6_gctimer;
783 } else if (is_override /* (2a) */
784 || (lladdr && !llchange) /* (2b) */
785 || !lladdr) { /* (2c) */
787 * Update link-local address, if any.
790 sdl->sdl_alen = ifp->if_addrlen;
791 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
795 * If solicited, make the state REACHABLE.
796 * If not solicited and the link-layer address was
797 * changed, make it STALE.
800 ln->ln_state = ND6_LLINFO_REACHABLE;
803 ln->ln_expire = time_uptime +
804 ND_IFINFO(ifp)->reachable;
807 if (lladdr && llchange) {
808 ln->ln_state = ND6_LLINFO_STALE;
809 ln->ln_expire = time_uptime + nd6_gctimer;
814 if (ln->ln_router && !is_router) {
816 * The peer dropped the router flag.
817 * Remove the sender from the Default Router List and
818 * update the Destination Cache entries.
820 struct nd_defrouter *dr;
821 struct in6_addr *in6;
823 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
826 * Lock to protect the default router list.
827 * XXX: this might be unnecessary, since this function
828 * is only called under the network software interrupt
829 * context. However, we keep it just for safety.
832 dr = defrouter_lookup(in6, rt->rt_ifp);
835 mtx_unlock(&nd6_mtx);
837 if (dr == NULL && !ip6_forwarding && ip6_accept_rtadv) {
839 * Even if the neighbor is not in the default
840 * router list, the neighbor may be used
841 * as a next hop for some destinations
842 * (e.g. redirect case). So we must
843 * call rt6_flush explicitly.
845 rt6_flush(&ip6->ip6_src, rt->rt_ifp);
848 ln->ln_router = is_router;
850 rt->rt_flags &= ~RTF_REJECT;
854 * we assume ifp is not a loopback here, so just set the 2nd
855 * argument as the 1st one.
857 nd6_output(ifp, ifp, ln->ln_hold,
858 (struct sockaddr_in6 *)rt_key(rt), rt);
867 icmp6stat.icp6s_badna++;
872 * Neighbor advertisement output handling.
876 * the following items are not implemented yet:
877 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
878 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
881 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6,
882 const struct in6_addr *taddr6, u_long flags,
883 int tlladdr, /* 1 if include target link-layer address */
884 struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */
888 struct nd_neighbor_advert *nd_na;
889 struct in6_ifaddr *ia = NULL;
890 struct ip6_moptions im6o;
894 struct ifnet *outif = NULL;
896 /* estimate the size of message */
897 maxlen = sizeof(*ip6) + sizeof(*nd_na);
898 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
899 if (max_linkhdr + maxlen > MCLBYTES) {
901 kprintf("nd6_na_output: max_linkhdr + maxlen > MCLBYTES "
902 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
907 m = m_getb(max_linkhdr + maxlen, M_NOWAIT, MT_DATA, M_PKTHDR);
911 if (IN6_IS_ADDR_MULTICAST(daddr6)) {
912 m->m_flags |= M_MCAST;
913 im6o.im6o_multicast_ifp = ifp;
914 im6o.im6o_multicast_hlim = 255;
915 im6o.im6o_multicast_loop = 0;
918 icmp6len = sizeof(*nd_na);
919 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
920 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
922 /* fill neighbor advertisement packet */
923 ip6 = mtod(m, struct ip6_hdr *);
925 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
926 ip6->ip6_vfc |= IPV6_VERSION;
927 ip6->ip6_nxt = IPPROTO_ICMPV6;
929 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
931 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
932 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
933 ip6->ip6_dst.s6_addr32[1] = 0;
934 ip6->ip6_dst.s6_addr32[2] = 0;
935 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
936 flags &= ~ND_NA_FLAG_SOLICITED;
938 ip6->ip6_dst = *daddr6;
941 * Select a source whose scope is the same as that of the dest.
943 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
948 ip6->ip6_src = ia->ia_addr.sin6_addr;
949 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
950 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
951 nd_na->nd_na_code = 0;
952 nd_na->nd_na_target = *taddr6;
953 in6_clearscope(&nd_na->nd_na_target); /* XXX */
956 * "tlladdr" indicates NS's condition for adding tlladdr or not.
957 * see nd6_ns_input() for details.
958 * Basically, if NS packet is sent to unicast/anycast addr,
959 * target lladdr option SHOULD NOT be included.
964 * sdl0 != NULL indicates proxy NA. If we do proxy, use
965 * lladdr in sdl0. If we are not proxying (sending NA for
966 * my address) use lladdr configured for the interface.
971 mac = carp_macmatch6(ifp->if_carp, m, taddr6);
973 mac = nd6_ifptomac(ifp);
975 mac = nd6_ifptomac(ifp);
977 } else if (sdl0->sa_family == AF_LINK) {
978 struct sockaddr_dl *sdl;
979 sdl = (struct sockaddr_dl *)sdl0;
980 if (sdl->sdl_alen == ifp->if_addrlen)
985 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
986 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
988 /* roundup to 8 bytes alignment! */
989 optlen = (optlen + 7) & ~7;
991 m->m_pkthdr.len += optlen;
994 bzero((caddr_t)nd_opt, optlen);
995 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
996 nd_opt->nd_opt_len = optlen >> 3;
997 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
999 flags &= ~ND_NA_FLAG_OVERRIDE;
1001 ip6->ip6_plen = htons((u_short)icmp6len);
1002 nd_na->nd_na_flags_reserved = flags;
1003 nd_na->nd_na_cksum = 0;
1004 nd_na->nd_na_cksum =
1005 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1007 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL);
1009 icmp6_ifstat_inc(outif, ifs6_out_msg);
1010 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
1012 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
1016 nd6_ifptomac(struct ifnet *ifp)
1018 switch (ifp->if_type) {
1024 #ifdef IFT_IEEE80211
1030 return ((caddr_t)(ifp + 1));
1037 struct netmsg_base base;
1042 TAILQ_ENTRY(dadq) dad_list;
1043 struct ifaddr *dad_ifa;
1044 int dad_count; /* max NS to send */
1045 int dad_ns_tcount; /* # of trials to send NS */
1046 int dad_ns_ocount; /* NS sent so far */
1049 struct callout dad_timer_ch;
1050 struct netmsg_dad dad_nmsg;
1052 TAILQ_HEAD(dadq_head, dadq);
1054 static struct dadq_head dadq = TAILQ_HEAD_INITIALIZER(dadq);
1056 static struct dadq *
1057 nd6_dad_find(struct ifaddr *ifa)
1063 TAILQ_FOREACH(dp, &dadq, dad_list) {
1064 if (dp->dad_ifa == ifa)
1071 nd6_dad_starttimer(struct dadq *dp, int ticks)
1074 callout_reset(&dp->dad_timer_ch, ticks, nd6_dad_timer, dp);
1078 nd6_dad_stoptimer(struct dadq *dp)
1081 callout_stop(&dp->dad_timer_ch);
1085 * Start Duplicated Address Detection (DAD) for specified interface address.
1088 nd6_dad_start(struct ifaddr *ifa,
1089 int *tick) /* minimum delay ticks for IFF_UP event */
1091 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1097 * If we don't need DAD, don't do it.
1098 * There are several cases:
1099 * - DAD is disabled (ip6_dad_count == 0)
1100 * - the interface address is anycast
1102 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1104 "nd6_dad_start: called with non-tentative address "
1106 ip6_sprintf(&ia->ia_addr.sin6_addr),
1107 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1110 if (ia->ia6_flags & IN6_IFF_ANYCAST || !ip6_dad_count) {
1111 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1112 in6_newaddrmsg(ifa);
1116 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1117 if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1119 if (nd6_dad_find(ifa) != NULL) {
1120 /* DAD already in progress */
1124 dp = nd6_dad_create(ifa);
1125 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1126 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1129 * Send NS packet for DAD, dp->dad_count times.
1130 * Note that we must delay the first transmission, if this is the
1131 * first packet to be sent from the interface after interface
1132 * (re)initialization.
1135 nd6_dad_ns_output(dp);
1136 nd6_dad_starttimer(dp,
1137 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1142 ntick = krandom() % (MAX_RTR_SOLICITATION_DELAY * hz);
1144 ntick = *tick + krandom() % (hz / 2);
1146 nd6_dad_starttimer(dp, ntick);
1151 * Terminate DAD unconditionally. Used for address removals.
1154 nd6_dad_stop(struct ifaddr *ifa)
1160 dp = nd6_dad_find(ifa);
1162 /* DAD wasn't started yet */
1165 nd6_dad_destroy(dp);
1168 static struct dadq *
1169 nd6_dad_create(struct ifaddr *ifa)
1171 struct netmsg_dad *dm;
1176 dp = kmalloc(sizeof(*dp), M_IP6NDP, M_INTWAIT | M_ZERO);
1177 callout_init_mp(&dp->dad_timer_ch);
1180 netmsg_init(&dm->base, NULL, &netisr_adone_rport,
1181 MSGF_DROPABLE | MSGF_PRIORITY, nd6_dad_timer_handler);
1185 IFAREF(ifa); /* just for safety */
1187 /* Send NS packet for DAD, ip6_dad_count times. */
1188 dp->dad_count = ip6_dad_count;
1190 TAILQ_INSERT_TAIL(&dadq, dp, dad_list);
1196 nd6_dad_destroy(struct dadq *dp)
1198 struct lwkt_msg *lmsg = &dp->dad_nmsg.base.lmsg;
1202 TAILQ_REMOVE(&dadq, dp, dad_list);
1204 nd6_dad_stoptimer(dp);
1207 if ((lmsg->ms_flags & MSGF_DONE) == 0)
1211 IFAFREE(dp->dad_ifa);
1212 kfree(dp, M_IP6NDP);
1216 nd6_dad_timer(void *xdp)
1218 struct dadq *dp = xdp;
1219 struct lwkt_msg *lmsg = &dp->dad_nmsg.base.lmsg;
1221 KASSERT(mycpuid == 0, ("dad timer not on cpu0"));
1224 if (lmsg->ms_flags & MSGF_DONE)
1225 lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg);
1230 nd6_dad_timer_handler(netmsg_t msg)
1232 struct netmsg_dad *dm = (struct netmsg_dad *)msg;
1233 struct dadq *dp = dm->dadq;
1234 struct ifaddr *ifa = dp->dad_ifa;
1235 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1241 lwkt_replymsg(&dm->base.lmsg, 0);
1244 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1245 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1247 ip6_sprintf(&ia->ia_addr.sin6_addr),
1248 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1251 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1252 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1254 ip6_sprintf(&ia->ia_addr.sin6_addr),
1255 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1259 /* Timed out with IFF_{RUNNING,UP} check */
1260 if (dp->dad_ns_tcount > dad_maxtry) {
1261 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1262 if_name(ifa->ifa_ifp)));
1266 /* Need more checks? */
1267 if (dp->dad_ns_ocount < dp->dad_count) {
1269 * We have more NS to go. Send NS packet for DAD.
1271 nd6_dad_ns_output(dp);
1272 nd6_dad_starttimer(dp,
1273 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1276 * We have transmitted sufficient number of DAD packets.
1277 * See what we've got.
1283 if (dp->dad_na_icount) {
1285 * the check is in nd6_dad_na_input(),
1291 if (dp->dad_ns_icount) {
1292 #if 0 /* heuristics */
1295 * - we have sent many(?) DAD NS, and
1296 * - the number of NS we sent equals to the
1297 * number of NS we've got, and
1299 * we may have a faulty network card/driver which
1300 * loops back multicasts to myself.
1302 if (3 < dp->dad_count
1303 && dp->dad_ns_icount == dp->dad_count
1304 && dp->dad_na_icount == 0) {
1305 log(LOG_INFO, "DAD questionable for %s(%s): "
1306 "network card loops back multicast?\n",
1307 ip6_sprintf(&ia->ia_addr.sin6_addr),
1308 if_name(ifa->ifa_ifp));
1309 /* XXX consider it a duplicate or not? */
1312 /* We've seen NS, means DAD has failed. */
1316 /* We've seen NS, means DAD has failed. */
1322 /* dp will be freed in nd6_dad_duplicated() */
1324 nd6_dad_duplicated(ifa);
1327 * We are done with DAD. No NA came, no NS came.
1328 * duplicated address found.
1330 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1331 in6_newaddrmsg(ifa);
1333 "%s: DAD complete for %s - no duplicates found\n",
1334 if_name(ifa->ifa_ifp),
1335 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1341 nd6_dad_destroy(dp);
1345 nd6_dad_duplicated(struct ifaddr *ifa)
1347 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1352 dp = nd6_dad_find(ifa);
1354 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1359 * We are done with DAD, with duplicated address found. (failure)
1361 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1362 "NS in/out=%d/%d, NA in=%d\n",
1363 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
1364 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1366 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1367 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1368 in6_newaddrmsg(ifa);
1370 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1371 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
1372 log(LOG_ERR, "%s: manual intervention required\n",
1373 if_name(ifa->ifa_ifp));
1375 nd6_dad_destroy(dp);
1379 nd6_dad_ns_output(struct dadq *dp)
1381 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1382 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1386 dp->dad_ns_tcount++;
1387 if (!(ifp->if_flags & IFF_UP)) {
1389 kprintf("%s: interface down?\n", if_name(ifp));
1393 if (!(ifp->if_flags & IFF_RUNNING)) {
1395 kprintf("%s: interface not running?\n", if_name(ifp));
1400 dp->dad_ns_ocount++;
1401 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1405 nd6_dad_ns_input(struct ifaddr *ifa)
1407 struct in6_ifaddr *ia;
1408 const struct in6_addr *taddr6;
1415 panic("ifa == NULL in nd6_dad_ns_input");
1417 ia = (struct in6_ifaddr *)ifa;
1418 taddr6 = &ia->ia_addr.sin6_addr;
1420 dp = nd6_dad_find(ifa);
1422 /* Quickhack - completely ignore DAD NS packets */
1423 if (dad_ignore_ns) {
1425 "nd6_dad_ns_input: ignoring DAD NS packet for "
1426 "address %s(%s)\n", ip6_sprintf(taddr6),
1427 if_name(ifa->ifa_ifp)));
1432 * if I'm yet to start DAD, someone else started using this address
1433 * first. I have a duplicate and you win.
1435 if (!dp || dp->dad_ns_ocount == 0)
1438 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1441 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1442 nd6_dad_duplicated(ifa);
1445 * not sure if I got a duplicate.
1446 * increment ns count and see what happens.
1449 dp->dad_ns_icount++;
1454 nd6_dad_na_input(struct ifaddr *ifa)
1461 panic("ifa == NULL in nd6_dad_na_input");
1463 dp = nd6_dad_find(ifa);
1465 dp->dad_na_icount++;
1467 /* remove the address. */
1468 nd6_dad_duplicated(ifa);