1 /* $FreeBSD$ */
2 /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
19 *
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
30 * SUCH DAMAGE.
31 */
32
33 #include "opt_inet.h"
34 #include "opt_inet6.h"
35 #include "opt_ipsec.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/malloc.h>
40 #include <sys/mbuf.h>
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
43 #include <sys/time.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
50 #include <net/if.h>
51 #include <net/if_types.h>
52 #include <net/if_dl.h>
53 #include <net/route.h>
54
55 #include <netinet/in.h>
56 #include <netinet/in_var.h>
57 #include <netinet6/in6_var.h>
58 #include <netinet/ip6.h>
59 #include <netinet6/ip6_var.h>
60 #include <netinet6/nd6.h>
61 #include <netinet/icmp6.h>
62
63 #ifdef IPSEC
64 #include <netinet6/ipsec.h>
65 #ifdef INET6
66 #include <netinet6/ipsec6.h>
67 #endif
68 #endif
69
70 #include <net/net_osdep.h>
71
72 #define SDL(s) ((struct sockaddr_dl *)s)
73
74 struct dadq;
75 static struct dadq *nd6_dad_find __P((struct ifaddr *));
76 static void nd6_dad_starttimer __P((struct dadq *, int));
77 static void nd6_dad_stoptimer __P((struct dadq *));
78 static void nd6_dad_timer __P((struct ifaddr *));
79 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *));
80 static void nd6_dad_ns_input __P((struct ifaddr *));
81 static void nd6_dad_na_input __P((struct ifaddr *));
82
83 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/
84 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */
85
86 /*
87 * Input an Neighbor Solicitation Message.
88 *
89 * Based on RFC 2461
90 * Based on RFC 2462 (duplicated address detection)
91 */
92 void
93 nd6_ns_input(m, off, icmp6len)
94 struct mbuf *m;
95 int off, icmp6len;
96 {
97 struct ifnet *ifp = m->m_pkthdr.rcvif;
98 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
99 struct nd_neighbor_solicit *nd_ns;
100 struct in6_addr saddr6 = ip6->ip6_src;
101 struct in6_addr daddr6 = ip6->ip6_dst;
102 struct in6_addr taddr6;
103 struct in6_addr myaddr6;
104 char *lladdr = NULL;
105 struct ifaddr *ifa;
106 int lladdrlen = 0;
107 int anycast = 0, proxy = 0, tentative = 0;
108 int tlladdr;
109 union nd_opts ndopts;
110 struct sockaddr_dl *proxydl = NULL;
111
112 #ifndef PULLDOWN_TEST
113 IP6_EXTHDR_CHECK(m, off, icmp6len,);
114 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off);
115 #else
116 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len);
117 if (nd_ns == NULL) {
118 icmp6stat.icp6s_tooshort++;
119 return;
120 }
121 #endif
122 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */
123 taddr6 = nd_ns->nd_ns_target;
124
125 if (ip6->ip6_hlim != 255) {
126 nd6log((LOG_ERR,
127 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n",
128 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
129 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
130 goto bad;
131 }
132
133 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
134 /* dst has to be solicited node multicast address. */
135 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL
136 /* don't check ifindex portion */
137 && daddr6.s6_addr32[1] == 0
138 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE
139 && daddr6.s6_addr8[12] == 0xff) {
140 ; /* good */
141 } else {
142 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
143 "(wrong ip6 dst)\n"));
144 goto bad;
145 }
146 }
147
148 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
149 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"));
150 goto bad;
151 }
152
153 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
154 taddr6.s6_addr16[1] = htons(ifp->if_index);
155
156 icmp6len -= sizeof(*nd_ns);
157 nd6_option_init(nd_ns + 1, icmp6len, &ndopts);
158 if (nd6_options(&ndopts) < 0) {
159 nd6log((LOG_INFO,
160 "nd6_ns_input: invalid ND option, ignored\n"));
161 /* nd6_options have incremented stats */
162 goto freeit;
163 }
164
165 if (ndopts.nd_opts_src_lladdr) {
166 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1);
167 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3;
168 }
169
170 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) {
171 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet "
172 "(link-layer address option)\n"));
173 goto bad;
174 }
175
176 /*
177 * Attaching target link-layer address to the NA?
178 * (RFC 2461 7.2.4)
179 *
180 * NS IP dst is unicast/anycast MUST NOT add
181 * NS IP dst is solicited-node multicast MUST add
182 *
183 * In implementation, we add target link-layer address by default.
184 * We do not add one in MUST NOT cases.
185 */
186 #if 0 /* too much! */
187 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6);
188 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST))
189 tlladdr = 0;
190 else
191 #endif
192 if (!IN6_IS_ADDR_MULTICAST(&daddr6))
193 tlladdr = 0;
194 else
195 tlladdr = 1;
196
197 /*
198 * Target address (taddr6) must be either:
199 * (1) Valid unicast/anycast address for my receiving interface,
200 * (2) Unicast address for which I'm offering proxy service, or
201 * (3) "tentative" address on which DAD is being performed.
202 */
203 /* (1) and (3) check. */
204 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
205
206 /* (2) check. */
207 if (!ifa) {
208 struct rtentry *rt;
209 struct sockaddr_in6 tsin6;
210
211 bzero(&tsin6, sizeof tsin6);
212 tsin6.sin6_len = sizeof(struct sockaddr_in6);
213 tsin6.sin6_family = AF_INET6;
214 tsin6.sin6_addr = taddr6;
215
216 rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0);
217 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 &&
218 rt->rt_gateway->sa_family == AF_LINK) {
219 /*
220 * proxy NDP for single entry
221 */
222 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp,
223 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST);
224 if (ifa) {
225 proxy = 1;
226 proxydl = SDL(rt->rt_gateway);
227 }
228 }
229 if (rt)
230 rtfree(rt);
231 }
232 if (!ifa) {
233 /*
234 * We've got an NS packet, and we don't have that adddress
235 * assigned for us. We MUST silently ignore it.
236 * See RFC2461 7.2.3.
237 */
238 goto freeit;
239 }
240 myaddr6 = *IFA_IN6(ifa);
241 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST;
242 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE;
243 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED)
244 goto freeit;
245
246 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
247 nd6log((LOG_INFO,
248 "nd6_ns_input: lladdrlen mismatch for %s "
249 "(if %d, NS packet %d)\n",
250 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
251 goto bad;
252 }
253
254 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) {
255 nd6log((LOG_INFO,
256 "nd6_ns_input: duplicate IP6 address %s\n",
257 ip6_sprintf(&saddr6)));
258 goto freeit;
259 }
260
261 /*
262 * We have neighbor solicitation packet, with target address equals to
263 * one of my tentative address.
264 *
265 * src addr how to process?
266 * --- ---
267 * multicast of course, invalid (rejected in ip6_input)
268 * unicast somebody is doing address resolution -> ignore
269 * unspec dup address detection
270 *
271 * The processing is defined in RFC 2462.
272 */
273 if (tentative) {
274 /*
275 * If source address is unspecified address, it is for
276 * duplicated address detection.
277 *
278 * If not, the packet is for addess resolution;
279 * silently ignore it.
280 */
281 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6))
282 nd6_dad_ns_input(ifa);
283
284 goto freeit;
285 }
286
287 /*
288 * If the source address is unspecified address, entries must not
289 * be created or updated.
290 * It looks that sender is performing DAD. Output NA toward
291 * all-node multicast address, to tell the sender that I'm using
292 * the address.
293 * S bit ("solicited") must be zero.
294 */
295 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) {
296 saddr6 = in6addr_linklocal_allnodes;
297 saddr6.s6_addr16[1] = htons(ifp->if_index);
298 nd6_na_output(ifp, &saddr6, &taddr6,
299 ((anycast || proxy || !tlladdr)
300 ? 0 : ND_NA_FLAG_OVERRIDE)
301 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0),
302 tlladdr, (struct sockaddr *)proxydl);
303 goto freeit;
304 }
305
306 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0);
307
308 nd6_na_output(ifp, &saddr6, &taddr6,
309 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE)
310 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0)
311 | ND_NA_FLAG_SOLICITED,
312 tlladdr, (struct sockaddr *)proxydl);
313 freeit:
314 m_freem(m);
315 return;
316
317 bad:
318 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)));
319 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)));
320 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)));
321 icmp6stat.icp6s_badns++;
322 m_freem(m);
323 }
324
325 /*
326 * Output an Neighbor Solicitation Message. Caller specifies:
327 * - ICMP6 header source IP6 address
328 * - ND6 header target IP6 address
329 * - ND6 header source datalink address
330 *
331 * Based on RFC 2461
332 * Based on RFC 2462 (duplicated address detection)
333 */
334 void
335 nd6_ns_output(ifp, daddr6, taddr6, ln, dad)
336 struct ifnet *ifp;
337 const struct in6_addr *daddr6, *taddr6;
338 struct llinfo_nd6 *ln; /* for source address determination */
339 int dad; /* duplicated address detection */
340 {
341 struct mbuf *m;
342 struct ip6_hdr *ip6;
343 struct nd_neighbor_solicit *nd_ns;
344 struct in6_ifaddr *ia = NULL;
345 struct ip6_moptions im6o;
346 int icmp6len;
347 int maxlen;
348 caddr_t mac;
349 struct ifnet *outif = NULL;
350
351 if (IN6_IS_ADDR_MULTICAST(taddr6))
352 return;
353
354 /* estimate the size of message */
355 maxlen = sizeof(*ip6) + sizeof(*nd_ns);
356 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
357 if (max_linkhdr + maxlen >= MCLBYTES) {
358 #ifdef DIAGNOSTIC
359 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES "
360 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
361 #endif
362 return;
363 }
364
365 MGETHDR(m, M_DONTWAIT, MT_DATA);
366 if (m && max_linkhdr + maxlen >= MHLEN) {
367 MCLGET(m, M_DONTWAIT);
368 if ((m->m_flags & M_EXT) == 0) {
369 m_free(m);
370 m = NULL;
371 }
372 }
373 if (m == NULL)
374 return;
375 m->m_pkthdr.rcvif = NULL;
376
377 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) {
378 m->m_flags |= M_MCAST;
379 im6o.im6o_multicast_ifp = ifp;
380 im6o.im6o_multicast_hlim = 255;
381 im6o.im6o_multicast_loop = 0;
382 }
383
384 icmp6len = sizeof(*nd_ns);
385 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len;
386 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
387
388 /* fill neighbor solicitation packet */
389 ip6 = mtod(m, struct ip6_hdr *);
390 ip6->ip6_flow = 0;
391 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
392 ip6->ip6_vfc |= IPV6_VERSION;
393 /* ip6->ip6_plen will be set later */
394 ip6->ip6_nxt = IPPROTO_ICMPV6;
395 ip6->ip6_hlim = 255;
396 if (daddr6)
397 ip6->ip6_dst = *daddr6;
398 else {
399 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
400 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
401 ip6->ip6_dst.s6_addr32[1] = 0;
402 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE;
403 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3];
404 ip6->ip6_dst.s6_addr8[12] = 0xff;
405 }
406 if (!dad) {
407 #if 0 /* KAME way, exact address scope match */
408 /*
409 * Select a source whose scope is the same as that of the dest.
410 * Typically, the dest is link-local solicitation multicast
411 * (i.e. neighbor discovery) or link-local/global unicast
412 * (i.e. neighbor un-reachability detection).
413 */
414 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
415 if (ia == NULL) {
416 m_freem(m);
417 return;
418 }
419 ip6->ip6_src = ia->ia_addr.sin6_addr;
420 #else /* spec-wise correct */
421 /*
422 * RFC2461 7.2.2:
423 * "If the source address of the packet prompting the
424 * solicitation is the same as one of the addresses assigned
425 * to the outgoing interface, that address SHOULD be placed
426 * in the IP Source Address of the outgoing solicitation.
427 * Otherwise, any one of the addresses assigned to the
428 * interface should be used."
429 *
430 * We use the source address for the prompting packet
431 * (saddr6), if:
432 * - saddr6 is given from the caller (by giving "ln"), and
433 * - saddr6 belongs to the outgoing interface.
434 * Otherwise, we perform a scope-wise match.
435 */
436 struct ip6_hdr *hip6; /* hold ip6 */
437 struct in6_addr *saddr6;
438
439 if (ln && ln->ln_hold) {
440 hip6 = mtod(ln->ln_hold, struct ip6_hdr *);
441 /* XXX pullup? */
442 if (sizeof(*hip6) < ln->ln_hold->m_len)
443 saddr6 = &hip6->ip6_src;
444 else
445 saddr6 = NULL;
446 } else
447 saddr6 = NULL;
448 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6))
449 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6));
450 else {
451 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
452 if (ia == NULL) {
453 m_freem(m);
454 return;
455 }
456 ip6->ip6_src = ia->ia_addr.sin6_addr;
457 }
458 #endif
459 } else {
460 /*
461 * Source address for DAD packet must always be IPv6
462 * unspecified address. (0::0)
463 */
464 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src));
465 }
466 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1);
467 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT;
468 nd_ns->nd_ns_code = 0;
469 nd_ns->nd_ns_reserved = 0;
470 nd_ns->nd_ns_target = *taddr6;
471
472 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target))
473 nd_ns->nd_ns_target.s6_addr16[1] = 0;
474
475 /*
476 * Add source link-layer address option.
477 *
478 * spec implementation
479 * --- ---
480 * DAD packet MUST NOT do not add the option
481 * there's no link layer address:
482 * impossible do not add the option
483 * there's link layer address:
484 * Multicast NS MUST add one add the option
485 * Unicast NS SHOULD add one add the option
486 */
487 if (!dad && (mac = nd6_ifptomac(ifp))) {
488 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
489 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1);
490 /* 8 byte alignments... */
491 optlen = (optlen + 7) & ~7;
492
493 m->m_pkthdr.len += optlen;
494 m->m_len += optlen;
495 icmp6len += optlen;
496 bzero((caddr_t)nd_opt, optlen);
497 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR;
498 nd_opt->nd_opt_len = optlen >> 3;
499 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
500 }
501
502 ip6->ip6_plen = htons((u_short)icmp6len);
503 nd_ns->nd_ns_cksum = 0;
504 nd_ns->nd_ns_cksum
505 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len);
506
507 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL);
508 if (outif) {
509 icmp6_ifstat_inc(outif, ifs6_out_msg);
510 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit);
511 }
512 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++;
513 }
514
515 /*
516 * Neighbor advertisement input handling.
517 *
518 * Based on RFC 2461
519 * Based on RFC 2462 (duplicated address detection)
520 *
521 * the following items are not implemented yet:
522 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
523 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
524 */
525 void
526 nd6_na_input(m, off, icmp6len)
527 struct mbuf *m;
528 int off, icmp6len;
529 {
530 struct ifnet *ifp = m->m_pkthdr.rcvif;
531 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
532 struct nd_neighbor_advert *nd_na;
533 #if 0
534 struct in6_addr saddr6 = ip6->ip6_src;
535 #endif
536 struct in6_addr daddr6 = ip6->ip6_dst;
537 struct in6_addr taddr6;
538 int flags;
539 int is_router;
540 int is_solicited;
541 int is_override;
542 char *lladdr = NULL;
543 int lladdrlen = 0;
544 struct ifaddr *ifa;
545 struct llinfo_nd6 *ln;
546 struct rtentry *rt;
547 struct sockaddr_dl *sdl;
548 union nd_opts ndopts;
549
550 if (ip6->ip6_hlim != 255) {
551 nd6log((LOG_ERR,
552 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n",
553 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src),
554 ip6_sprintf(&ip6->ip6_dst), if_name(ifp)));
555 goto bad;
556 }
557
558 #ifndef PULLDOWN_TEST
559 IP6_EXTHDR_CHECK(m, off, icmp6len,);
560 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off);
561 #else
562 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len);
563 if (nd_na == NULL) {
564 icmp6stat.icp6s_tooshort++;
565 return;
566 }
567 #endif
568 taddr6 = nd_na->nd_na_target;
569 flags = nd_na->nd_na_flags_reserved;
570 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0);
571 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0);
572 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0);
573
574 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6))
575 taddr6.s6_addr16[1] = htons(ifp->if_index);
576
577 if (IN6_IS_ADDR_MULTICAST(&taddr6)) {
578 nd6log((LOG_ERR,
579 "nd6_na_input: invalid target address %s\n",
580 ip6_sprintf(&taddr6)));
581 goto bad;
582 }
583 if (IN6_IS_ADDR_MULTICAST(&daddr6))
584 if (is_solicited) {
585 nd6log((LOG_ERR,
586 "nd6_na_input: a solicited adv is multicasted\n"));
587 goto bad;
588 }
589
590 icmp6len -= sizeof(*nd_na);
591 nd6_option_init(nd_na + 1, icmp6len, &ndopts);
592 if (nd6_options(&ndopts) < 0) {
593 nd6log((LOG_INFO,
594 "nd6_na_input: invalid ND option, ignored\n"));
595 /* nd6_options have incremented stats */
596 goto freeit;
597 }
598
599 if (ndopts.nd_opts_tgt_lladdr) {
600 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
601 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
602 }
603
604 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6);
605
606 /*
607 * Target address matches one of my interface address.
608 *
609 * If my address is tentative, this means that there's somebody
610 * already using the same address as mine. This indicates DAD failure.
611 * This is defined in RFC 2462.
612 *
613 * Otherwise, process as defined in RFC 2461.
614 */
615 if (ifa
616 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) {
617 nd6_dad_na_input(ifa);
618 goto freeit;
619 }
620
621 /* Just for safety, maybe unnecessary. */
622 if (ifa) {
623 log(LOG_ERR,
624 "nd6_na_input: duplicate IP6 address %s\n",
625 ip6_sprintf(&taddr6));
626 goto freeit;
627 }
628
629 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
630 nd6log((LOG_INFO,
631 "nd6_na_input: lladdrlen mismatch for %s "
632 "(if %d, NA packet %d)\n",
633 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2));
634 goto bad;
635 }
636
637 /*
638 * If no neighbor cache entry is found, NA SHOULD silently be discarded.
639 */
640 rt = nd6_lookup(&taddr6, 0, ifp);
641 if ((rt == NULL) ||
642 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) ||
643 ((sdl = SDL(rt->rt_gateway)) == NULL))
644 goto freeit;
645
646 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
647 /*
648 * If the link-layer has address, and no lladdr option came,
649 * discard the packet.
650 */
651 if (ifp->if_addrlen && !lladdr)
652 goto freeit;
653
654 /*
655 * Record link-layer address, and update the state.
656 */
657 sdl->sdl_alen = ifp->if_addrlen;
658 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
659 if (is_solicited) {
660 ln->ln_state = ND6_LLINFO_REACHABLE;
661 ln->ln_byhint = 0;
662 if (ln->ln_expire)
663 ln->ln_expire = time_second +
664 nd_ifinfo[rt->rt_ifp->if_index].reachable;
665 } else {
666 ln->ln_state = ND6_LLINFO_STALE;
667 ln->ln_expire = time_second + nd6_gctimer;
668 }
669 if ((ln->ln_router = is_router) != 0) {
670 /*
671 * This means a router's state has changed from
672 * non-reachable to probably reachable, and might
673 * affect the status of associated prefixes..
674 */
675 pfxlist_onlink_check();
676 }
677 } else {
678 int llchange;
679
680 /*
681 * Check if the link-layer address has changed or not.
682 */
683 if (!lladdr)
684 llchange = 0;
685 else {
686 if (sdl->sdl_alen) {
687 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
688 llchange = 1;
689 else
690 llchange = 0;
691 } else
692 llchange = 1;
693 }
694
695 /*
696 * This is VERY complex. Look at it with care.
697 *
698 * override solicit lladdr llchange action
699 * (L: record lladdr)
700 *
701 * 0 0 n -- (2c)
702 * 0 0 y n (2b) L
703 * 0 0 y y (1) REACHABLE->STALE
704 * 0 1 n -- (2c) *->REACHABLE
705 * 0 1 y n (2b) L *->REACHABLE
706 * 0 1 y y (1) REACHABLE->STALE
707 * 1 0 n -- (2a)
708 * 1 0 y n (2a) L
709 * 1 0 y y (2a) L *->STALE
710 * 1 1 n -- (2a) *->REACHABLE
711 * 1 1 y n (2a) L *->REACHABLE
712 * 1 1 y y (2a) L *->REACHABLE
713 */
714 if (!is_override && (lladdr && llchange)) { /* (1) */
715 /*
716 * If state is REACHABLE, make it STALE.
717 * no other updates should be done.
718 */
719 if (ln->ln_state == ND6_LLINFO_REACHABLE) {
720 ln->ln_state = ND6_LLINFO_STALE;
721 ln->ln_expire = time_second + nd6_gctimer;
722 }
723 goto freeit;
724 } else if (is_override /* (2a) */
725 || (!is_override && (lladdr && !llchange)) /* (2b) */
726 || !lladdr) { /* (2c) */
727 /*
728 * Update link-local address, if any.
729 */
730 if (lladdr) {
731 sdl->sdl_alen = ifp->if_addrlen;
732 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
733 }
734
735 /*
736 * If solicited, make the state REACHABLE.
737 * If not solicited and the link-layer address was
738 * changed, make it STALE.
739 */
740 if (is_solicited) {
741 ln->ln_state = ND6_LLINFO_REACHABLE;
742 ln->ln_byhint = 0;
743 if (ln->ln_expire) {
744 ln->ln_expire = time_second +
745 nd_ifinfo[ifp->if_index].reachable;
746 }
747 } else {
748 if (lladdr && llchange) {
749 ln->ln_state = ND6_LLINFO_STALE;
750 ln->ln_expire = time_second + nd6_gctimer;
751 }
752 }
753 }
754
755 if (ln->ln_router && !is_router) {
756 /*
757 * The peer dropped the router flag.
758 * Remove the sender from the Default Router List and
759 * update the Destination Cache entries.
760 */
761 struct nd_defrouter *dr;
762 struct in6_addr *in6;
763 int s;
764
765 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
766
767 /*
768 * Lock to protect the default router list.
769 * XXX: this might be unnecessary, since this function
770 * is only called under the network software interrupt
771 * context. However, we keep it just for safety.
772 */
773 s = splnet();
774 dr = defrouter_lookup(in6, rt->rt_ifp);
775 if (dr)
776 defrtrlist_del(dr);
777 else if (!ip6_forwarding && ip6_accept_rtadv) {
778 /*
779 * Even if the neighbor is not in the default
780 * router list, the neighbor may be used
781 * as a next hop for some destinations
782 * (e.g. redirect case). So we must
783 * call rt6_flush explicitly.
784 */
785 rt6_flush(&ip6->ip6_src, rt->rt_ifp);
786 }
787 splx(s);
788 }
789 ln->ln_router = is_router;
790 }
791 rt->rt_flags &= ~RTF_REJECT;
792 ln->ln_asked = 0;
793 if (ln->ln_hold) {
794 /*
795 * we assume ifp is not a loopback here, so just set the 2nd
796 * argument as the 1st one.
797 */
798 nd6_output(ifp, ifp, ln->ln_hold,
799 (struct sockaddr_in6 *)rt_key(rt), rt);
800 ln->ln_hold = 0;
801 }
802
803 freeit:
804 m_freem(m);
805 return;
806
807 bad:
808 icmp6stat.icp6s_badna++;
809 m_freem(m);
810 }
811
812 /*
813 * Neighbor advertisement output handling.
814 *
815 * Based on RFC 2461
816 *
817 * the following items are not implemented yet:
818 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD)
819 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD)
820 */
821 void
822 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0)
823 struct ifnet *ifp;
824 const struct in6_addr *daddr6, *taddr6;
825 u_long flags;
826 int tlladdr; /* 1 if include target link-layer address */
827 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */
828 {
829 struct mbuf *m;
830 struct ip6_hdr *ip6;
831 struct nd_neighbor_advert *nd_na;
832 struct in6_ifaddr *ia = NULL;
833 struct ip6_moptions im6o;
834 int icmp6len;
835 int maxlen;
836 caddr_t mac;
837 struct ifnet *outif = NULL;
838
839 /* estimate the size of message */
840 maxlen = sizeof(*ip6) + sizeof(*nd_na);
841 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7;
842 if (max_linkhdr + maxlen >= MCLBYTES) {
843 #ifdef DIAGNOSTIC
844 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES "
845 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES);
846 #endif
847 return;
848 }
849
850 MGETHDR(m, M_DONTWAIT, MT_DATA);
851 if (m && max_linkhdr + maxlen >= MHLEN) {
852 MCLGET(m, M_DONTWAIT);
853 if ((m->m_flags & M_EXT) == 0) {
854 m_free(m);
855 m = NULL;
856 }
857 }
858 if (m == NULL)
859 return;
860 m->m_pkthdr.rcvif = NULL;
861
862 if (IN6_IS_ADDR_MULTICAST(daddr6)) {
863 m->m_flags |= M_MCAST;
864 im6o.im6o_multicast_ifp = ifp;
865 im6o.im6o_multicast_hlim = 255;
866 im6o.im6o_multicast_loop = 0;
867 }
868
869 icmp6len = sizeof(*nd_na);
870 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len;
871 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */
872
873 /* fill neighbor advertisement packet */
874 ip6 = mtod(m, struct ip6_hdr *);
875 ip6->ip6_flow = 0;
876 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
877 ip6->ip6_vfc |= IPV6_VERSION;
878 ip6->ip6_nxt = IPPROTO_ICMPV6;
879 ip6->ip6_hlim = 255;
880 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) {
881 /* reply to DAD */
882 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL;
883 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index);
884 ip6->ip6_dst.s6_addr32[1] = 0;
885 ip6->ip6_dst.s6_addr32[2] = 0;
886 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE;
887 flags &= ~ND_NA_FLAG_SOLICITED;
888 } else
889 ip6->ip6_dst = *daddr6;
890
891 /*
892 * Select a source whose scope is the same as that of the dest.
893 */
894 ia = in6_ifawithifp(ifp, &ip6->ip6_dst);
895 if (ia == NULL) {
896 m_freem(m);
897 return;
898 }
899 ip6->ip6_src = ia->ia_addr.sin6_addr;
900 nd_na = (struct nd_neighbor_advert *)(ip6 + 1);
901 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT;
902 nd_na->nd_na_code = 0;
903 nd_na->nd_na_target = *taddr6;
904 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target))
905 nd_na->nd_na_target.s6_addr16[1] = 0;
906
907 /*
908 * "tlladdr" indicates NS's condition for adding tlladdr or not.
909 * see nd6_ns_input() for details.
910 * Basically, if NS packet is sent to unicast/anycast addr,
911 * target lladdr option SHOULD NOT be included.
912 */
913 if (tlladdr) {
914 mac = NULL;
915 /*
916 * sdl0 != NULL indicates proxy NA. If we do proxy, use
917 * lladdr in sdl0. If we are not proxying (sending NA for
918 * my address) use lladdr configured for the interface.
919 */
920 if (sdl0 == NULL)
921 mac = nd6_ifptomac(ifp);
922 else if (sdl0->sa_family == AF_LINK) {
923 struct sockaddr_dl *sdl;
924 sdl = (struct sockaddr_dl *)sdl0;
925 if (sdl->sdl_alen == ifp->if_addrlen)
926 mac = LLADDR(sdl);
927 }
928 }
929 if (tlladdr && mac) {
930 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen;
931 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1);
932
933 /* roundup to 8 bytes alignment! */
934 optlen = (optlen + 7) & ~7;
935
936 m->m_pkthdr.len += optlen;
937 m->m_len += optlen;
938 icmp6len += optlen;
939 bzero((caddr_t)nd_opt, optlen);
940 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
941 nd_opt->nd_opt_len = optlen >> 3;
942 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen);
943 } else
944 flags &= ~ND_NA_FLAG_OVERRIDE;
945
946 ip6->ip6_plen = htons((u_short)icmp6len);
947 nd_na->nd_na_flags_reserved = flags;
948 nd_na->nd_na_cksum = 0;
949 nd_na->nd_na_cksum =
950 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len);
951
952 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL);
953 if (outif) {
954 icmp6_ifstat_inc(outif, ifs6_out_msg);
955 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert);
956 }
957 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++;
958 }
959
960 caddr_t
961 nd6_ifptomac(ifp)
962 struct ifnet *ifp;
963 {
964 switch (ifp->if_type) {
965 case IFT_ARCNET:
966 case IFT_ETHER:
967 case IFT_FDDI:
968 case IFT_IEEE1394:
969 #ifdef IFT_L2VLAN
970 case IFT_L2VLAN:
971 #endif
972 #ifdef IFT_IEEE80211
973 case IFT_IEEE80211:
974 #endif
975 return ((caddr_t)(ifp + 1));
976 break;
977 default:
978 return NULL;
979 }
980 }
981
982 TAILQ_HEAD(dadq_head, dadq);
983 struct dadq {
984 TAILQ_ENTRY(dadq) dad_list;
985 struct ifaddr *dad_ifa;
986 int dad_count; /* max NS to send */
987 int dad_ns_tcount; /* # of trials to send NS */
988 int dad_ns_ocount; /* NS sent so far */
989 int dad_ns_icount;
990 int dad_na_icount;
991 struct callout dad_timer_ch;
992 };
993
994 static struct dadq_head dadq;
995 static int dad_init = 0;
996
997 static struct dadq *
998 nd6_dad_find(ifa)
999 struct ifaddr *ifa;
1000 {
1001 struct dadq *dp;
1002
1003 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) {
1004 if (dp->dad_ifa == ifa)
1005 return dp;
1006 }
1007 return NULL;
1008 }
1009
1010 static void
1011 nd6_dad_starttimer(dp, ticks)
1012 struct dadq *dp;
1013 int ticks;
1014 {
1015
1016 callout_reset(&dp->dad_timer_ch, ticks,
1017 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa);
1018 }
1019
1020 static void
1021 nd6_dad_stoptimer(dp)
1022 struct dadq *dp;
1023 {
1024
1025 callout_stop(&dp->dad_timer_ch);
1026 }
1027
1028 /*
1029 * Start Duplicated Address Detection (DAD) for specified interface address.
1030 */
1031 void
1032 nd6_dad_start(ifa, tick)
1033 struct ifaddr *ifa;
1034 int *tick; /* minimum delay ticks for IFF_UP event */
1035 {
1036 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1037 struct dadq *dp;
1038
1039 if (!dad_init) {
1040 TAILQ_INIT(&dadq);
1041 dad_init++;
1042 }
1043
1044 /*
1045 * If we don't need DAD, don't do it.
1046 * There are several cases:
1047 * - DAD is disabled (ip6_dad_count == 0)
1048 * - the interface address is anycast
1049 */
1050 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1051 log(LOG_DEBUG,
1052 "nd6_dad_start: called with non-tentative address "
1053 "%s(%s)\n",
1054 ip6_sprintf(&ia->ia_addr.sin6_addr),
1055 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1056 return;
1057 }
1058 if (ia->ia6_flags & IN6_IFF_ANYCAST) {
1059 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1060 return;
1061 }
1062 if (!ip6_dad_count) {
1063 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1064 return;
1065 }
1066 if (!ifa->ifa_ifp)
1067 panic("nd6_dad_start: ifa->ifa_ifp == NULL");
1068 if (!(ifa->ifa_ifp->if_flags & IFF_UP))
1069 return;
1070 if (nd6_dad_find(ifa) != NULL) {
1071 /* DAD already in progress */
1072 return;
1073 }
1074
1075 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT);
1076 if (dp == NULL) {
1077 log(LOG_ERR, "nd6_dad_start: memory allocation failed for "
1078 "%s(%s)\n",
1079 ip6_sprintf(&ia->ia_addr.sin6_addr),
1080 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1081 return;
1082 }
1083 bzero(dp, sizeof(*dp));
1084 callout_init(&dp->dad_timer_ch);
1085 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list);
1086
1087 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp),
1088 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1089
1090 /*
1091 * Send NS packet for DAD, ip6_dad_count times.
1092 * Note that we must delay the first transmission, if this is the
1093 * first packet to be sent from the interface after interface
1094 * (re)initialization.
1095 */
1096 dp->dad_ifa = ifa;
1097 IFAREF(ifa); /* just for safety */
1098 dp->dad_count = ip6_dad_count;
1099 dp->dad_ns_icount = dp->dad_na_icount = 0;
1100 dp->dad_ns_ocount = dp->dad_ns_tcount = 0;
1101 if (tick == NULL) {
1102 nd6_dad_ns_output(dp, ifa);
1103 nd6_dad_starttimer(dp,
1104 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
1105 } else {
1106 int ntick;
1107
1108 if (*tick == 0)
1109 ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz);
1110 else
1111 ntick = *tick + random() % (hz / 2);
1112 *tick = ntick;
1113 nd6_dad_starttimer(dp, ntick);
1114 }
1115 }
1116
1117 /*
1118 * terminate DAD unconditionally. used for address removals.
1119 */
1120 void
1121 nd6_dad_stop(ifa)
1122 struct ifaddr *ifa;
1123 {
1124 struct dadq *dp;
1125
1126 if (!dad_init)
1127 return;
1128 dp = nd6_dad_find(ifa);
1129 if (!dp) {
1130 /* DAD wasn't started yet */
1131 return;
1132 }
1133
1134 nd6_dad_stoptimer(dp);
1135
1136 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1137 free(dp, M_IP6NDP);
1138 dp = NULL;
1139 IFAFREE(ifa);
1140 }
1141
1142 static void
1143 nd6_dad_timer(ifa)
1144 struct ifaddr *ifa;
1145 {
1146 int s;
1147 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1148 struct dadq *dp;
1149
1150 s = splnet(); /* XXX */
1151
1152 /* Sanity check */
1153 if (ia == NULL) {
1154 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n");
1155 goto done;
1156 }
1157 dp = nd6_dad_find(ifa);
1158 if (dp == NULL) {
1159 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n");
1160 goto done;
1161 }
1162 if (ia->ia6_flags & IN6_IFF_DUPLICATED) {
1163 log(LOG_ERR, "nd6_dad_timer: called with duplicated address "
1164 "%s(%s)\n",
1165 ip6_sprintf(&ia->ia_addr.sin6_addr),
1166 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1167 goto done;
1168 }
1169 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) {
1170 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address "
1171 "%s(%s)\n",
1172 ip6_sprintf(&ia->ia_addr.sin6_addr),
1173 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???");
1174 goto done;
1175 }
1176
1177 /* timeouted with IFF_{RUNNING,UP} check */
1178 if (dp->dad_ns_tcount > dad_maxtry) {
1179 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n",
1180 if_name(ifa->ifa_ifp)));
1181
1182 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1183 free(dp, M_IP6NDP);
1184 dp = NULL;
1185 IFAFREE(ifa);
1186 goto done;
1187 }
1188
1189 /* Need more checks? */
1190 if (dp->dad_ns_ocount < dp->dad_count) {
1191 /*
1192 * We have more NS to go. Send NS packet for DAD.
1193 */
1194 nd6_dad_ns_output(dp, ifa);
1195 nd6_dad_starttimer(dp,
1196 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000);
1197 } else {
1198 /*
1199 * We have transmitted sufficient number of DAD packets.
1200 * See what we've got.
1201 */
1202 int duplicate;
1203
1204 duplicate = 0;
1205
1206 if (dp->dad_na_icount) {
1207 /*
1208 * the check is in nd6_dad_na_input(),
1209 * but just in case
1210 */
1211 duplicate++;
1212 }
1213
1214 if (dp->dad_ns_icount) {
1215 #if 0 /* heuristics */
1216 /*
1217 * if
1218 * - we have sent many(?) DAD NS, and
1219 * - the number of NS we sent equals to the
1220 * number of NS we've got, and
1221 * - we've got no NA
1222 * we may have a faulty network card/driver which
1223 * loops back multicasts to myself.
1224 */
1225 if (3 < dp->dad_count
1226 && dp->dad_ns_icount == dp->dad_count
1227 && dp->dad_na_icount == 0) {
1228 log(LOG_INFO, "DAD questionable for %s(%s): "
1229 "network card loops back multicast?\n",
1230 ip6_sprintf(&ia->ia_addr.sin6_addr),
1231 if_name(ifa->ifa_ifp));
1232 /* XXX consider it a duplicate or not? */
1233 /* duplicate++; */
1234 } else {
1235 /* We've seen NS, means DAD has failed. */
1236 duplicate++;
1237 }
1238 #else
1239 /* We've seen NS, means DAD has failed. */
1240 duplicate++;
1241 #endif
1242 }
1243
1244 if (duplicate) {
1245 /* (*dp) will be freed in nd6_dad_duplicated() */
1246 dp = NULL;
1247 nd6_dad_duplicated(ifa);
1248 } else {
1249 /*
1250 * We are done with DAD. No NA came, no NS came.
1251 * duplicated address found.
1252 */
1253 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1254
1255 nd6log((LOG_DEBUG,
1256 "%s: DAD complete for %s - no duplicates found\n",
1257 if_name(ifa->ifa_ifp),
1258 ip6_sprintf(&ia->ia_addr.sin6_addr)));
1259
1260 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1261 free(dp, M_IP6NDP);
1262 dp = NULL;
1263 IFAFREE(ifa);
1264 }
1265 }
1266
1267 done:
1268 splx(s);
1269 }
1270
1271 void
1272 nd6_dad_duplicated(ifa)
1273 struct ifaddr *ifa;
1274 {
1275 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1276 struct dadq *dp;
1277
1278 dp = nd6_dad_find(ifa);
1279 if (dp == NULL) {
1280 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n");
1281 return;
1282 }
1283
1284 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: "
1285 "NS in/out=%d/%d, NA in=%d\n",
1286 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr),
1287 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount);
1288
1289 ia->ia6_flags &= ~IN6_IFF_TENTATIVE;
1290 ia->ia6_flags |= IN6_IFF_DUPLICATED;
1291
1292 /* We are done with DAD, with duplicated address found. (failure) */
1293 nd6_dad_stoptimer(dp);
1294
1295 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n",
1296 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr));
1297 log(LOG_ERR, "%s: manual intervention required\n",
1298 if_name(ifa->ifa_ifp));
1299
1300 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list);
1301 free(dp, M_IP6NDP);
1302 dp = NULL;
1303 IFAFREE(ifa);
1304 }
1305
1306 static void
1307 nd6_dad_ns_output(dp, ifa)
1308 struct dadq *dp;
1309 struct ifaddr *ifa;
1310 {
1311 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa;
1312 struct ifnet *ifp = ifa->ifa_ifp;
1313
1314 dp->dad_ns_tcount++;
1315 if ((ifp->if_flags & IFF_UP) == 0) {
1316 #if 0
1317 printf("%s: interface down?\n", if_name(ifp));
1318 #endif
1319 return;
1320 }
1321 if ((ifp->if_flags & IFF_RUNNING) == 0) {
1322 #if 0
1323 printf("%s: interface not running?\n", if_name(ifp));
1324 #endif
1325 return;
1326 }
1327
1328 dp->dad_ns_ocount++;
1329 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1);
1330 }
1331
1332 static void
1333 nd6_dad_ns_input(ifa)
1334 struct ifaddr *ifa;
1335 {
1336 struct in6_ifaddr *ia;
1337 struct ifnet *ifp;
1338 const struct in6_addr *taddr6;
1339 struct dadq *dp;
1340 int duplicate;
1341
1342 if (!ifa)
1343 panic("ifa == NULL in nd6_dad_ns_input");
1344
1345 ia = (struct in6_ifaddr *)ifa;
1346 ifp = ifa->ifa_ifp;
1347 taddr6 = &ia->ia_addr.sin6_addr;
1348 duplicate = 0;
1349 dp = nd6_dad_find(ifa);
1350
1351 /* Quickhack - completely ignore DAD NS packets */
1352 if (dad_ignore_ns) {
1353 nd6log((LOG_INFO,
1354 "nd6_dad_ns_input: ignoring DAD NS packet for "
1355 "address %s(%s)\n", ip6_sprintf(taddr6),
1356 if_name(ifa->ifa_ifp)));
1357 return;
1358 }
1359
1360 /*
1361 * if I'm yet to start DAD, someone else started using this address
1362 * first. I have a duplicate and you win.
1363 */
1364 if (!dp || dp->dad_ns_ocount == 0)
1365 duplicate++;
1366
1367 /* XXX more checks for loopback situation - see nd6_dad_timer too */
1368
1369 if (duplicate) {
1370 dp = NULL; /* will be freed in nd6_dad_duplicated() */
1371 nd6_dad_duplicated(ifa);
1372 } else {
1373 /*
1374 * not sure if I got a duplicate.
1375 * increment ns count and see what happens.
1376 */
1377 if (dp)
1378 dp->dad_ns_icount++;
1379 }
1380 }
1381
1382 static void
1383 nd6_dad_na_input(ifa)
1384 struct ifaddr *ifa;
1385 {
1386 struct dadq *dp;
1387
1388 if (!ifa)
1389 panic("ifa == NULL in nd6_dad_na_input");
1390
1391 dp = nd6_dad_find(ifa);
1392 if (dp)
1393 dp->dad_na_icount++;
1394
1395 /* remove the address. */
1396 nd6_dad_duplicated(ifa);
1397 }
Cache object: 96a68847ea162c0b7e9c1cf40eec841a
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