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"
35 #include "opt_ipsec.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/socket.h>
43 #include <sys/sockio.h>
45 #include <sys/kernel.h>
46 #include <sys/errno.h>
47 #include <sys/syslog.h>
48 #include <sys/queue.h>
49 #include <sys/callout.h>
50 #include <sys/mutex.h>
52 #include <sys/thread2.h>
53 #include <sys/mutex2.h>
56 #include <net/if_types.h>
57 #include <net/if_dl.h>
58 #include <net/route.h>
59 #include <net/netisr2.h>
60 #include <net/netmsg2.h>
62 #include <netinet/in.h>
63 #include <netinet/in_var.h>
64 #include <netinet6/in6_var.h>
65 #include <netinet/ip6.h>
66 #include <netinet6/ip6_var.h>
67 #include <netinet6/nd6.h>
68 #include <netinet/icmp6.h>
71 #include <netinet6/ipsec.h>
73 #include <netinet6/ipsec6.h>
77 #include <net/net_osdep.h>
80 #include <netinet/ip_carp.h>
84 #define SDL(s) ((struct sockaddr_dl *)s)
87 static struct dadq *nd6_dad_find(struct ifaddr *);
88 static void nd6_dad_starttimer(struct dadq *, int);
89 static void nd6_dad_stoptimer(struct dadq *);
90 static void nd6_dad_timer(void *);
91 static void nd6_dad_timer_handler(netmsg_t);
92 static void nd6_dad_ns_output(struct dadq *);
93 static void nd6_dad_ns_input(struct ifaddr *);
94 static void nd6_dad_na_input(struct ifaddr *);
95 static struct dadq *nd6_dad_create(struct ifaddr *);
96 static void nd6_dad_destroy(struct dadq *);
97 static void nd6_dad_duplicated(struct ifaddr *);
99 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
100 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
103 * Input an Neighbor Solicitation Message.
106 * Based on RFC 2462 (duplicated address detection)
109 nd6_ns_input(struct mbuf *m, int off, int icmp6len)
111 struct ifnet *ifp = m->m_pkthdr.rcvif;
112 struct ifnet *cmpifp;
113 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
114 struct nd_neighbor_solicit *nd_ns;
115 struct in6_addr saddr6 = ip6->ip6_src;
116 struct in6_addr daddr6 = ip6->ip6_dst;
117 struct in6_addr taddr6;
118 struct in6_addr myaddr6;
120 struct ifaddr *ifa = NULL;
122 int anycast = 0, proxy = 0, tentative = 0;
124 union nd_opts ndopts;
125 struct sockaddr_dl *proxydl = NULL;
128 * Collapse interfaces to the bridge for comparison and
129 * mac (llinfo) purposes.
133 cmpifp = ifp->if_bridge;
135 #ifndef PULLDOWN_TEST
136 IP6_EXTHDR_CHECK(m, off, icmp6len,);
137 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
139 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
141 icmp6stat.icp6s_tooshort++;
145 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
146 taddr6 = nd_ns->nd_ns_target;
148 if (ip6->ip6_hlim != 255) {
150 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
151 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
152 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
156 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
157 /* dst has to be solicited node multicast address. */
158 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL &&
159 /* don't check ifindex portion */
160 daddr6.s6_addr32[1] == 0 &&
161 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE &&
162 daddr6.s6_addr8[12] == 0xff) {
165 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
166 "(wrong ip6 dst)\n"));
169 } else if (!nd6_onlink_ns_rfc4861) {
171 * Make sure the source address is from a neighbor's address.
173 * XXX probably only need to check cmpifp.
175 if (in6ifa_ifplocaladdr(cmpifp, &saddr6) == NULL &&
176 in6ifa_ifplocaladdr(ifp, &saddr6) == NULL) {
177 nd6log((LOG_INFO, "nd6_ns_input: "
178 "NS packet from non-neighbor\n"));
183 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
184 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
188 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
189 taddr6.s6_addr16[1] = htons(ifp->if_index);
191 icmp6len -= sizeof(*nd_ns);
192 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
193 if (nd6_options(&ndopts) < 0) {
195 "nd6_ns_input: invalid ND option, ignored\n"));
196 /* nd6_options have incremented stats */
200 if (ndopts.nd_opts_src_lladdr) {
201 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
202 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
205 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
206 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
207 "(link-layer address option)\n"));
212 * Attaching target link-layer address to the NA?
215 * NS IP dst is unicast/anycast MUST NOT add
216 * NS IP dst is solicited-node multicast MUST add
218 * In implementation, we add target link-layer address by default.
219 * We do not add one in MUST NOT cases.
221 #if 0 /* too much! */
222 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
223 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
227 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
233 * Target address (taddr6) must be either:
234 * (1) Valid unicast/anycast address for my receiving interface.
235 * (2) Unicast or anycast address for which I'm offering proxy
237 * (3) "tentative" address on which DAD is being performed.
239 /* (1) and (3) check. */
242 ifa = carp_iamatch6(ifp->if_carp, &taddr6);
244 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
246 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
250 * (2) Check proxying. Requires ip6_forwarding to be turned on.
252 * If the packet is anycast the target route must be on a
253 * different interface because the anycast will get anything
254 * on the current interface.
256 * If the packet is unicast the target route may be on the
257 * same interface. If the gateway is a (typically manually
258 * configured) link address we can directly offer it.
259 * XXX for now we don't do this but instead offer ours and
262 * WARNING! Since this is a subnet proxy the interface proxying
263 * the ND6 must be in promiscuous mode or it will not see the
264 * solicited multicast requests for various hosts being proxied.
266 * WARNING! Since this is a subnet proxy we have to treat bridge
267 * interfaces as being the bridge itself so we do not proxy-nd6
268 * between bridge interfaces (which are effectively switched).
270 * (In the specific-host-proxy case via RTF_ANNOUNCE, which is
271 * a bitch to configure, a specific multicast route is already
272 * added for that host <-- NOT RECOMMENDED).
274 if (!ifa && ip6_forwarding) {
276 struct sockaddr_in6 tsin6;
279 bzero(&tsin6, sizeof tsin6);
280 tsin6.sin6_len = sizeof(struct sockaddr_in6);
281 tsin6.sin6_family = AF_INET6;
282 tsin6.sin6_addr = taddr6;
284 rt = rtpurelookup((struct sockaddr *)&tsin6);
285 rtifp = rt ? rt->rt_ifp : NULL;
286 if (rtifp && rtifp->if_bridge)
287 rtifp = rtifp->if_bridge;
291 (cmpifp == rtifp && (m->m_flags & M_MCAST) == 0))
293 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(cmpifp,
294 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
296 "nd6_ns_input: nd6 proxy %s(%s)<-%s ifa %p\n",
297 if_name(cmpifp), if_name(ifp),
298 if_name(rtifp), ifa));
302 * Manual link address on same interface
303 * w/announce flag will proxy-arp using
304 * target mac, else our mac is used.
306 if (cmpifp == rtifp &&
307 (rt->rt_flags & RTF_ANNOUNCE) &&
308 rt->rt_gateway->sa_family == AF_LINK) {
309 proxydl = SDL(rt->rt_gateway);
318 * We've got an NS packet, and we don't have that adddress
319 * assigned for us. We MUST silently ignore it.
324 myaddr6 = *IFA_IN6(ifa);
325 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
326 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
327 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
330 if (lladdr && ((cmpifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
331 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s "
332 "(if %d, NS packet %d)\n",
333 ip6_sprintf(&taddr6), cmpifp->if_addrlen, lladdrlen - 2));
337 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
338 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n",
339 ip6_sprintf(&saddr6)));
344 * We have neighbor solicitation packet, with target address equals to
345 * one of my tentative address.
347 * src addr how to process?
349 * multicast of course, invalid (rejected in ip6_input)
350 * unicast somebody is doing address resolution -> ignore
351 * unspec dup address detection
353 * The processing is defined in RFC 2462.
357 * If source address is unspecified address, it is for
358 * duplicated address detection.
360 * If not, the packet is for addess resolution;
361 * silently ignore it.
363 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
364 nd6_dad_ns_input(ifa);
370 * If the source address is unspecified address, entries must not
371 * be created or updated.
372 * It looks that sender is performing DAD. Output NA toward
373 * all-node multicast address, to tell the sender that I'm using
375 * S bit ("solicited") must be zero.
377 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
378 saddr6 = kin6addr_linklocal_allnodes;
379 saddr6.s6_addr16[1] = htons(cmpifp->if_index);
380 nd6_na_output(cmpifp, &saddr6, &taddr6,
381 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
382 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
383 tlladdr, (struct sockaddr *)proxydl);
387 nd6_cache_lladdr(cmpifp, &saddr6, lladdr, lladdrlen,
388 ND_NEIGHBOR_SOLICIT, 0);
390 nd6_na_output(ifp, &saddr6, &taddr6,
391 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) |
392 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED,
393 tlladdr, (struct sockaddr *)proxydl);
399 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
400 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
401 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
402 icmp6stat.icp6s_badns++;
407 * Output an Neighbor Solicitation Message. Caller specifies:
408 * - ICMP6 header source IP6 address
409 * - ND6 header target IP6 address
410 * - ND6 header source datalink address
413 * Based on RFC 2462 (duplicated address detection)
416 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6,
417 const struct in6_addr *taddr6,
418 struct llinfo_nd6 *ln, /* for source address determination */
419 int dad) /* duplicated address detection */
423 struct nd_neighbor_solicit *nd_ns;
424 struct in6_ifaddr *ia = NULL;
425 struct ip6_moptions im6o;
429 struct ifnet *outif = NULL;
431 if (IN6_IS_ADDR_MULTICAST(taddr6))
434 /* estimate the size of message */
435 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
436 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
437 if (max_linkhdr + maxlen >= MCLBYTES) {
439 kprintf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
440 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
445 m = m_getb(max_linkhdr + maxlen, M_NOWAIT, MT_DATA, M_PKTHDR);
449 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
450 m->m_flags |= M_MCAST;
451 im6o.im6o_multicast_ifp = ifp;
452 im6o.im6o_multicast_hlim = 255;
453 im6o.im6o_multicast_loop = 0;
456 icmp6len = sizeof(*nd_ns);
457 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
458 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
460 /* fill neighbor solicitation packet */
461 ip6 = mtod(m, struct ip6_hdr *);
463 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
464 ip6->ip6_vfc |= IPV6_VERSION;
465 /* ip6->ip6_plen will be set later */
466 ip6->ip6_nxt = IPPROTO_ICMPV6;
469 ip6->ip6_dst = *daddr6;
471 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
472 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
473 ip6->ip6_dst.s6_addr32[1] = 0;
474 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
475 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
476 ip6->ip6_dst.s6_addr8[12] = 0xff;
481 * "If the source address of the packet prompting the
482 * solicitation is the same as one of the addresses assigned
483 * to the outgoing interface, that address SHOULD be placed
484 * in the IP Source Address of the outgoing solicitation.
485 * Otherwise, any one of the addresses assigned to the
486 * interface should be used."
488 * We use the source address for the prompting packet
490 * - saddr6 is given from the caller (by giving "ln"), and
491 * - saddr6 belongs to the outgoing interface.
492 * Otherwise, we perform a scope-wise match.
494 struct ip6_hdr *hip6; /* hold ip6 */
495 struct in6_addr *saddr6;
497 if (ln && ln->ln_hold) {
498 hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
500 if (sizeof(*hip6) < ln->ln_hold->m_len)
501 saddr6 = &hip6->ip6_src;
506 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
507 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
509 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
514 ip6->ip6_src = ia->ia_addr.sin6_addr;
518 * Source address for DAD packet must always be IPv6
519 * unspecified address. (0::0)
521 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
523 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
524 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
525 nd_ns->nd_ns_code = 0;
526 nd_ns->nd_ns_reserved = 0;
527 nd_ns->nd_ns_target = *taddr6;
529 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target))
530 nd_ns->nd_ns_target.s6_addr16[1] = 0;
533 * Add source link-layer address option.
535 * spec implementation
537 * DAD packet MUST NOT do not add the option
538 * there's no link layer address:
539 * impossible do not add the option
540 * there's link layer address:
541 * Multicast NS MUST add one add the option
542 * Unicast NS SHOULD add one add the option
544 if (!dad && (mac = nd6_ifptomac(ifp))) {
545 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
546 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
547 /* 8 byte alignments... */
548 optlen = (optlen + 7) & ~7;
550 m->m_pkthdr.len += optlen;
553 bzero((caddr_t)nd_opt, optlen);
554 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
555 nd_opt->nd_opt_len = optlen >> 3;
556 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
559 ip6->ip6_plen = htons((u_short)icmp6len);
560 nd_ns->nd_ns_cksum = 0;
562 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
564 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL);
566 icmp6_ifstat_inc(outif, ifs6_out_msg);
567 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
569 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
573 * Neighbor advertisement input handling.
576 * Based on RFC 2462 (duplicated address detection)
578 * the following items are not implemented yet:
579 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
580 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
583 nd6_na_input(struct mbuf *m, int off, int icmp6len)
585 struct ifnet *ifp = m->m_pkthdr.rcvif;
586 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
587 struct nd_neighbor_advert *nd_na;
588 struct in6_addr saddr6 = ip6->ip6_src;
589 struct in6_addr daddr6 = ip6->ip6_dst;
590 struct in6_addr taddr6;
598 struct llinfo_nd6 *ln;
600 struct sockaddr_dl *sdl;
601 union nd_opts ndopts;
603 if (ip6->ip6_hlim != 255) {
605 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
606 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
607 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
611 #ifndef PULLDOWN_TEST
612 IP6_EXTHDR_CHECK(m, off, icmp6len,);
613 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
615 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
617 icmp6stat.icp6s_tooshort++;
621 taddr6 = nd_na->nd_na_target;
622 flags = nd_na->nd_na_flags_reserved;
623 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
624 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
625 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
627 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
628 taddr6.s6_addr16[1] = htons(ifp->if_index);
630 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
632 "nd6_na_input: invalid target address %s\n",
633 ip6_sprintf(&taddr6)));
636 if (IN6_IS_ADDR_MULTICAST(&daddr6))
639 "nd6_na_input: a solicited adv is multicasted\n"));
643 icmp6len -= sizeof(*nd_na);
644 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
645 if (nd6_options(&ndopts) < 0) {
647 "nd6_na_input: invalid ND option, ignored\n"));
648 /* nd6_options have incremented stats */
652 if (ndopts.nd_opts_tgt_lladdr) {
653 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
654 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
657 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
660 * Target address matches one of my interface address.
662 * If my address is tentative, this means that there's somebody
663 * already using the same address as mine. This indicates DAD failure.
664 * This is defined in RFC 2462.
666 * Otherwise, process as defined in RFC 2461.
669 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
670 nd6_dad_na_input(ifa);
674 /* Just for safety, maybe unnecessary. */
677 "nd6_na_input: duplicate IP6 address %s\n",
678 ip6_sprintf(&taddr6));
683 * Make sure the source address is from a neighbor's address.
685 if (in6ifa_ifplocaladdr(ifp, &saddr6) == NULL) {
686 nd6log((LOG_INFO, "nd6_na_input: "
687 "NA packet from non-neighbor\n"));
691 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
692 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s "
693 "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6),
694 ifp->if_addrlen, lladdrlen - 2));
699 * If no neighbor cache entry is found, NA SHOULD silently be discarded.
701 rt = nd6_lookup(&taddr6, 0, ifp);
703 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
704 ((sdl = SDL(rt->rt_gateway)) == NULL))
707 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
709 * If the link-layer has address, and no lladdr option came,
710 * discard the packet.
712 if (ifp->if_addrlen && !lladdr)
716 * Record link-layer address, and update the state.
718 sdl->sdl_alen = ifp->if_addrlen;
719 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
721 ln->ln_state = ND6_LLINFO_REACHABLE;
724 ln->ln_expire = time_uptime +
725 ND_IFINFO(rt->rt_ifp)->reachable;
728 ln->ln_state = ND6_LLINFO_STALE;
729 ln->ln_expire = time_uptime + nd6_gctimer;
731 if ((ln->ln_router = is_router) != 0) {
733 * This means a router's state has changed from
734 * non-reachable to probably reachable, and might
735 * affect the status of associated prefixes..
737 pfxlist_onlink_check();
743 * Check if the link-layer address has changed or not.
749 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
758 * This is VERY complex. Look at it with care.
760 * override solicit lladdr llchange action
765 * 0 0 y y (1) REACHABLE->STALE
766 * 0 1 n -- (2c) *->REACHABLE
767 * 0 1 y n (2b) L *->REACHABLE
768 * 0 1 y y (1) REACHABLE->STALE
771 * 1 0 y y (2a) L *->STALE
772 * 1 1 n -- (2a) *->REACHABLE
773 * 1 1 y n (2a) L *->REACHABLE
774 * 1 1 y y (2a) L *->REACHABLE
776 if (!is_override && (lladdr && llchange)) { /* (1) */
778 * If state is REACHABLE, make it STALE.
779 * no other updates should be done.
781 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
782 ln->ln_state = ND6_LLINFO_STALE;
783 ln->ln_expire = time_uptime + nd6_gctimer;
786 } else if (is_override /* (2a) */
787 || (!is_override && (lladdr && !llchange)) /* (2b) */
788 || !lladdr) { /* (2c) */
790 * Update link-local address, if any.
793 sdl->sdl_alen = ifp->if_addrlen;
794 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
798 * If solicited, make the state REACHABLE.
799 * If not solicited and the link-layer address was
800 * changed, make it STALE.
803 ln->ln_state = ND6_LLINFO_REACHABLE;
806 ln->ln_expire = time_uptime +
807 ND_IFINFO(ifp)->reachable;
810 if (lladdr && llchange) {
811 ln->ln_state = ND6_LLINFO_STALE;
812 ln->ln_expire = time_uptime + nd6_gctimer;
817 if (ln->ln_router && !is_router) {
819 * The peer dropped the router flag.
820 * Remove the sender from the Default Router List and
821 * update the Destination Cache entries.
823 struct nd_defrouter *dr;
824 struct in6_addr *in6;
826 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
829 * Lock to protect the default router list.
830 * XXX: this might be unnecessary, since this function
831 * is only called under the network software interrupt
832 * context. However, we keep it just for safety.
835 dr = defrouter_lookup(in6, rt->rt_ifp);
838 mtx_unlock(&nd6_mtx);
840 if (dr == NULL && !ip6_forwarding && ip6_accept_rtadv) {
842 * Even if the neighbor is not in the default
843 * router list, the neighbor may be used
844 * as a next hop for some destinations
845 * (e.g. redirect case). So we must
846 * call rt6_flush explicitly.
848 rt6_flush(&ip6->ip6_src, rt->rt_ifp);
851 ln->ln_router = is_router;
853 rt->rt_flags &= ~RTF_REJECT;
857 * we assume ifp is not a loopback here, so just set the 2nd
858 * argument as the 1st one.
860 nd6_output(ifp, ifp, ln->ln_hold,
861 (struct sockaddr_in6 *)rt_key(rt), rt);
870 icmp6stat.icp6s_badna++;
875 * Neighbor advertisement output handling.
879 * the following items are not implemented yet:
880 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
881 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
884 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6,
885 const struct in6_addr *taddr6, u_long flags,
886 int tlladdr, /* 1 if include target link-layer address */
887 struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */
891 struct nd_neighbor_advert *nd_na;
892 struct in6_ifaddr *ia = NULL;
893 struct ip6_moptions im6o;
897 struct ifnet *outif = NULL;
899 /* estimate the size of message */
900 maxlen = sizeof(*ip6) + sizeof(*nd_na);
901 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
902 if (max_linkhdr + maxlen >= MCLBYTES) {
904 kprintf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
905 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
910 m = m_getb(max_linkhdr + maxlen, M_NOWAIT, MT_DATA, M_PKTHDR);
914 if (IN6_IS_ADDR_MULTICAST(daddr6)) {
915 m->m_flags |= M_MCAST;
916 im6o.im6o_multicast_ifp = ifp;
917 im6o.im6o_multicast_hlim = 255;
918 im6o.im6o_multicast_loop = 0;
921 icmp6len = sizeof(*nd_na);
922 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
923 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
925 /* fill neighbor advertisement packet */
926 ip6 = mtod(m, struct ip6_hdr *);
928 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
929 ip6->ip6_vfc |= IPV6_VERSION;
930 ip6->ip6_nxt = IPPROTO_ICMPV6;
932 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
934 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
935 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
936 ip6->ip6_dst.s6_addr32[1] = 0;
937 ip6->ip6_dst.s6_addr32[2] = 0;
938 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
939 flags &= ~ND_NA_FLAG_SOLICITED;
941 ip6->ip6_dst = *daddr6;
944 * Select a source whose scope is the same as that of the dest.
946 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
951 ip6->ip6_src = ia->ia_addr.sin6_addr;
952 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
953 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
954 nd_na->nd_na_code = 0;
955 nd_na->nd_na_target = *taddr6;
956 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target))
957 nd_na->nd_na_target.s6_addr16[1] = 0;
960 * "tlladdr" indicates NS's condition for adding tlladdr or not.
961 * see nd6_ns_input() for details.
962 * Basically, if NS packet is sent to unicast/anycast addr,
963 * target lladdr option SHOULD NOT be included.
968 * sdl0 != NULL indicates proxy NA. If we do proxy, use
969 * lladdr in sdl0. If we are not proxying (sending NA for
970 * my address) use lladdr configured for the interface.
975 mac = carp_macmatch6(ifp->if_carp, m, taddr6);
977 mac = nd6_ifptomac(ifp);
979 mac = nd6_ifptomac(ifp);
981 } else if (sdl0->sa_family == AF_LINK) {
982 struct sockaddr_dl *sdl;
983 sdl = (struct sockaddr_dl *)sdl0;
984 if (sdl->sdl_alen == ifp->if_addrlen)
989 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
990 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
992 /* roundup to 8 bytes alignment! */
993 optlen = (optlen + 7) & ~7;
995 m->m_pkthdr.len += optlen;
998 bzero((caddr_t)nd_opt, optlen);
999 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
1000 nd_opt->nd_opt_len = optlen >> 3;
1001 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
1003 flags &= ~ND_NA_FLAG_OVERRIDE;
1005 ip6->ip6_plen = htons((u_short)icmp6len);
1006 nd_na->nd_na_flags_reserved = flags;
1007 nd_na->nd_na_cksum = 0;
1008 nd_na->nd_na_cksum =
1009 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
1011 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL);
1013 icmp6_ifstat_inc(outif, ifs6_out_msg);
1014 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
1016 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
1020 nd6_ifptomac(struct ifnet *ifp)
1022 switch (ifp->if_type) {
1028 #ifdef IFT_IEEE80211
1034 return ((caddr_t)(ifp + 1));
1041 struct netmsg_base base;
1046 TAILQ_ENTRY(dadq) dad_list;
1047 struct ifaddr *dad_ifa;
1048 int dad_count; /* max NS to send */
1049 int dad_ns_tcount; /* # of trials to send NS */
1050 int dad_ns_ocount; /* NS sent so far */
1053 struct callout dad_timer_ch;
1054 struct netmsg_dad dad_nmsg;
1056 TAILQ_HEAD(dadq_head, dadq);
1058 static struct dadq_head dadq = TAILQ_HEAD_INITIALIZER(dadq);
1060 static struct dadq *
1061 nd6_dad_find(struct ifaddr *ifa)
1065 ASSERT_IN_NETISR(0);
1067 TAILQ_FOREACH(dp, &dadq, dad_list) {
1068 if (dp->dad_ifa == ifa)
1075 nd6_dad_starttimer(struct dadq *dp, int ticks)
1077 ASSERT_IN_NETISR(0);
1078 callout_reset(&dp->dad_timer_ch, ticks, nd6_dad_timer, dp);
1082 nd6_dad_stoptimer(struct dadq *dp)
1084 ASSERT_IN_NETISR(0);
1085 callout_stop(&dp->dad_timer_ch);
1089 * Start Duplicated Address Detection (DAD) for specified interface address.
1092 nd6_dad_start(struct ifaddr *ifa,
1093 int *tick) /* minimum delay ticks for IFF_UP event */
1095 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1098 ASSERT_IN_NETISR(0);
1101 * If we don't need DAD, don't do it.
1102 * There are several cases:
1103 * - DAD is disabled (ip6_dad_count == 0)
1104 * - the interface address is anycast
1106 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1108 "nd6_dad_start: called with non-tentative address "
1110 ip6_sprintf(&ia->ia_addr.sin6_addr),
1111 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1114 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1115 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1118 if (!ip6_dad_count) {
1119 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1123 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1124 if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1126 if (nd6_dad_find(ifa) != NULL) {
1127 /* DAD already in progress */
1131 dp = nd6_dad_create(ifa);
1132 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1133 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1136 * Send NS packet for DAD, dp->dad_count times.
1137 * Note that we must delay the first transmission, if this is the
1138 * first packet to be sent from the interface after interface
1139 * (re)initialization.
1142 nd6_dad_ns_output(dp);
1143 nd6_dad_starttimer(dp,
1144 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1149 ntick = krandom() % (MAX_RTR_SOLICITATION_DELAY * hz);
1151 ntick = *tick + krandom() % (hz / 2);
1153 nd6_dad_starttimer(dp, ntick);
1158 * Terminate DAD unconditionally. Used for address removals.
1161 nd6_dad_stop(struct ifaddr *ifa)
1165 ASSERT_IN_NETISR(0);
1167 dp = nd6_dad_find(ifa);
1169 /* DAD wasn't started yet */
1172 nd6_dad_destroy(dp);
1175 static struct dadq *
1176 nd6_dad_create(struct ifaddr *ifa)
1178 struct netmsg_dad *dm;
1181 ASSERT_IN_NETISR(0);
1183 dp = kmalloc(sizeof(*dp), M_IP6NDP, M_INTWAIT | M_ZERO);
1184 callout_init_mp(&dp->dad_timer_ch);
1187 netmsg_init(&dm->base, NULL, &netisr_adone_rport,
1188 MSGF_DROPABLE | MSGF_PRIORITY, nd6_dad_timer_handler);
1192 IFAREF(ifa); /* just for safety */
1194 /* Send NS packet for DAD, ip6_dad_count times. */
1195 dp->dad_count = ip6_dad_count;
1197 TAILQ_INSERT_TAIL(&dadq, dp, dad_list);
1203 nd6_dad_destroy(struct dadq *dp)
1205 struct lwkt_msg *lmsg = &dp->dad_nmsg.base.lmsg;
1207 ASSERT_IN_NETISR(0);
1209 TAILQ_REMOVE(&dadq, dp, dad_list);
1211 nd6_dad_stoptimer(dp);
1214 if ((lmsg->ms_flags & MSGF_DONE) == 0)
1218 IFAFREE(dp->dad_ifa);
1219 kfree(dp, M_IP6NDP);
1223 nd6_dad_timer(void *xdp)
1225 struct dadq *dp = xdp;
1226 struct lwkt_msg *lmsg = &dp->dad_nmsg.base.lmsg;
1228 KASSERT(mycpuid == 0, ("dad timer not on cpu0"));
1231 if (lmsg->ms_flags & MSGF_DONE)
1232 lwkt_sendmsg_oncpu(netisr_cpuport(0), lmsg);
1237 nd6_dad_timer_handler(netmsg_t msg)
1239 struct netmsg_dad *dm = (struct netmsg_dad *)msg;
1240 struct dadq *dp = dm->dadq;
1241 struct ifaddr *ifa = dp->dad_ifa;
1242 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1244 ASSERT_IN_NETISR(0);
1248 lwkt_replymsg(&dm->base.lmsg, 0);
1251 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1252 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1254 ip6_sprintf(&ia->ia_addr.sin6_addr),
1255 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1258 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1259 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1261 ip6_sprintf(&ia->ia_addr.sin6_addr),
1262 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1266 /* Timed out with IFF_{RUNNING,UP} check */
1267 if (dp->dad_ns_tcount > dad_maxtry) {
1268 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1269 if_name(ifa->ifa_ifp)));
1273 /* Need more checks? */
1274 if (dp->dad_ns_ocount < dp->dad_count) {
1276 * We have more NS to go. Send NS packet for DAD.
1278 nd6_dad_ns_output(dp);
1279 nd6_dad_starttimer(dp,
1280 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000);
1283 * We have transmitted sufficient number of DAD packets.
1284 * See what we've got.
1290 if (dp->dad_na_icount) {
1292 * the check is in nd6_dad_na_input(),
1298 if (dp->dad_ns_icount) {
1299 #if 0 /* heuristics */
1302 * - we have sent many(?) DAD NS, and
1303 * - the number of NS we sent equals to the
1304 * number of NS we've got, and
1306 * we may have a faulty network card/driver which
1307 * loops back multicasts to myself.
1309 if (3 < dp->dad_count
1310 && dp->dad_ns_icount == dp->dad_count
1311 && dp->dad_na_icount == 0) {
1312 log(LOG_INFO, "DAD questionable for %s(%s): "
1313 "network card loops back multicast?\n",
1314 ip6_sprintf(&ia->ia_addr.sin6_addr),
1315 if_name(ifa->ifa_ifp));
1316 /* XXX consider it a duplicate or not? */
1319 /* We've seen NS, means DAD has failed. */
1323 /* We've seen NS, means DAD has failed. */
1329 /* dp will be freed in nd6_dad_duplicated() */
1331 nd6_dad_duplicated(ifa);
1334 * We are done with DAD. No NA came, no NS came.
1335 * duplicated address found.
1337 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1339 "%s: DAD complete for %s - no duplicates found\n",
1340 if_name(ifa->ifa_ifp),
1341 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1347 nd6_dad_destroy(dp);
1351 nd6_dad_duplicated(struct ifaddr *ifa)
1353 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1356 ASSERT_IN_NETISR(0);
1358 dp = nd6_dad_find(ifa);
1360 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1365 * We are done with DAD, with duplicated address found. (failure)
1367 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1368 "NS in/out=%d/%d, NA in=%d\n",
1369 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
1370 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1372 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1373 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1375 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1376 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
1377 log(LOG_ERR, "%s: manual intervention required\n",
1378 if_name(ifa->ifa_ifp));
1380 nd6_dad_destroy(dp);
1384 nd6_dad_ns_output(struct dadq *dp)
1386 struct in6_ifaddr *ia = (struct in6_ifaddr *)dp->dad_ifa;
1387 struct ifnet *ifp = dp->dad_ifa->ifa_ifp;
1389 ASSERT_IN_NETISR(0);
1391 dp->dad_ns_tcount++;
1392 if (!(ifp->if_flags & IFF_UP)) {
1394 kprintf("%s: interface down?\n", if_name(ifp));
1398 if (!(ifp->if_flags & IFF_RUNNING)) {
1400 kprintf("%s: interface not running?\n", if_name(ifp));
1405 dp->dad_ns_ocount++;
1406 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1410 nd6_dad_ns_input(struct ifaddr *ifa)
1412 struct in6_ifaddr *ia;
1413 const struct in6_addr *taddr6;
1417 ASSERT_IN_NETISR(0);
1420 panic("ifa == NULL in nd6_dad_ns_input");
1422 ia = (struct in6_ifaddr *)ifa;
1423 taddr6 = &ia->ia_addr.sin6_addr;
1425 dp = nd6_dad_find(ifa);
1427 /* Quickhack - completely ignore DAD NS packets */
1428 if (dad_ignore_ns) {
1430 "nd6_dad_ns_input: ignoring DAD NS packet for "
1431 "address %s(%s)\n", ip6_sprintf(taddr6),
1432 if_name(ifa->ifa_ifp)));
1437 * if I'm yet to start DAD, someone else started using this address
1438 * first. I have a duplicate and you win.
1440 if (!dp || dp->dad_ns_ocount == 0)
1443 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1446 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1447 nd6_dad_duplicated(ifa);
1450 * not sure if I got a duplicate.
1451 * increment ns count and see what happens.
1454 dp->dad_ns_icount++;
1459 nd6_dad_na_input(struct ifaddr *ifa)
1463 ASSERT_IN_NETISR(0);
1466 panic("ifa == NULL in nd6_dad_na_input");
1468 dp = nd6_dad_find(ifa);
1470 dp->dad_na_icount++;
1472 /* remove the address. */
1473 nd6_dad_duplicated(ifa);