1 /*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_inet.h" 36 #include "opt_inet6.h" 37 #include "opt_ipsec.h" 38 #include "opt_carp.h" 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/sockio.h> 46 #include <sys/time.h> 47 #include <sys/kernel.h> 48 #include <sys/errno.h> 49 #include <sys/syslog.h> 50 #include <sys/queue.h> 51 #include <sys/callout.h> 52 53 #include <net/if.h> 54 #include <net/if_types.h> 55 #include <net/if_dl.h> 56 #include <net/if_var.h> 57 #include <net/route.h> 58 59 #include <netinet/in.h> 60 #include <netinet/in_var.h> 61 #include <netinet6/in6_var.h> 62 #include <netinet6/in6_ifattach.h> 63 #include <netinet/ip6.h> 64 #include <netinet6/ip6_var.h> 65 #include <netinet6/scope6_var.h> 66 #include <netinet6/nd6.h> 67 #include <netinet/icmp6.h> 68 69 #ifdef DEV_CARP 70 #include <netinet/ip_carp.h> 71 #endif 72 73 #define SDL(s) ((struct sockaddr_dl *)s) 74 75 struct dadq; 76 static struct dadq *nd6_dad_find(struct ifaddr *); 77 static void nd6_dad_starttimer(struct dadq *, int); 78 static void nd6_dad_stoptimer(struct dadq *); 79 static void nd6_dad_timer(struct ifaddr *); 80 static void nd6_dad_ns_output(struct dadq *, struct ifaddr *); 81 static void nd6_dad_ns_input(struct ifaddr *); 82 static void nd6_dad_na_input(struct ifaddr *); 83 84 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 85 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 86 87 /* 88 * Input a Neighbor Solicitation Message. 89 * 90 * Based on RFC 2461 91 * Based on RFC 2462 (duplicate address detection) 92 */ 93 void 94 nd6_ns_input(struct mbuf *m, int off, int icmp6len) 95 { 96 struct ifnet *ifp = m->m_pkthdr.rcvif; 97 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 98 struct nd_neighbor_solicit *nd_ns; 99 struct in6_addr saddr6 = ip6->ip6_src; 100 struct in6_addr daddr6 = ip6->ip6_dst; 101 struct in6_addr taddr6; 102 struct in6_addr myaddr6; 103 char *lladdr = NULL; 104 struct ifaddr *ifa = NULL; 105 int lladdrlen = 0; 106 int anycast = 0, proxy = 0, tentative = 0; 107 int tlladdr; 108 union nd_opts ndopts; 109 struct sockaddr_dl *proxydl = NULL; 110 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 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 if (in6_setscope(&taddr6, ifp, NULL) != 0) 125 goto bad; 126 127 if (ip6->ip6_hlim != 255) { 128 nd6log((LOG_ERR, 129 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 130 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 131 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 132 goto bad; 133 } 134 135 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 136 /* dst has to be a solicited node multicast address. */ 137 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 138 /* don't check ifindex portion */ 139 daddr6.s6_addr32[1] == 0 && 140 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 141 daddr6.s6_addr8[12] == 0xff) { 142 ; /* good */ 143 } else { 144 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 145 "(wrong ip6 dst)\n")); 146 goto bad; 147 } 148 } 149 150 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 151 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 152 goto bad; 153 } 154 155 icmp6len -= sizeof(*nd_ns); 156 nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 157 if (nd6_options(&ndopts) < 0) { 158 nd6log((LOG_INFO, 159 "nd6_ns_input: invalid ND option, ignored\n")); 160 /* nd6_options have incremented stats */ 161 goto freeit; 162 } 163 164 if (ndopts.nd_opts_src_lladdr) { 165 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 166 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 167 } 168 169 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 170 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 171 "(link-layer address option)\n")); 172 goto bad; 173 } 174 175 /* 176 * Attaching target link-layer address to the NA? 177 * (RFC 2461 7.2.4) 178 * 179 * NS IP dst is unicast/anycast MUST NOT add 180 * NS IP dst is solicited-node multicast MUST add 181 * 182 * In implementation, we add target link-layer address by default. 183 * We do not add one in MUST NOT cases. 184 */ 185 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 186 tlladdr = 0; 187 else 188 tlladdr = 1; 189 190 /* 191 * Target address (taddr6) must be either: 192 * (1) Valid unicast/anycast address for my receiving interface, 193 * (2) Unicast address for which I'm offering proxy service, or 194 * (3) "tentative" address on which DAD is being performed. 195 */ 196 /* (1) and (3) check. */ 197 #ifdef DEV_CARP 198 if (ifp->if_carp) 199 ifa = carp_iamatch6(ifp->if_carp, &taddr6); 200 if (ifa == NULL) 201 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 202 #else 203 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 204 #endif 205 206 /* (2) check. */ 207 if (ifa == NULL) { 208 struct rtentry *rt; 209 struct sockaddr_in6 tsin6; 210 int need_proxy; 211 212 bzero(&tsin6, sizeof tsin6); 213 tsin6.sin6_len = sizeof(struct sockaddr_in6); 214 tsin6.sin6_family = AF_INET6; 215 tsin6.sin6_addr = taddr6; 216 217 rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 218 need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 219 rt->rt_gateway->sa_family == AF_LINK); 220 if (rt) 221 rtfree(rt); 222 if (need_proxy) { 223 /* 224 * proxy NDP for single entry 225 */ 226 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 227 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 228 if (ifa) { 229 proxy = 1; 230 proxydl = SDL(rt->rt_gateway); 231 } 232 } 233 } 234 if (ifa == NULL) { 235 /* 236 * We've got an NS packet, and we don't have that adddress 237 * assigned for us. We MUST silently ignore it. 238 * See RFC2461 7.2.3. 239 */ 240 goto freeit; 241 } 242 myaddr6 = *IFA_IN6(ifa); 243 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 244 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 245 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 246 goto freeit; 247 248 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 249 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 250 "(if %d, NS packet %d)\n", 251 ip6_sprintf(ip6bufs, &taddr6), 252 ifp->if_addrlen, lladdrlen - 2)); 253 goto bad; 254 } 255 256 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 257 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 258 ip6_sprintf(ip6bufs, &saddr6))); 259 goto freeit; 260 } 261 262 /* 263 * We have neighbor solicitation packet, with target address equals to 264 * one of my tentative address. 265 * 266 * src addr how to process? 267 * --- --- 268 * multicast of course, invalid (rejected in ip6_input) 269 * unicast somebody is doing address resolution -> ignore 270 * unspec dup address detection 271 * 272 * The processing is defined in RFC 2462. 273 */ 274 if (tentative) { 275 /* 276 * If source address is unspecified address, it is for 277 * duplicate address detection. 278 * 279 * If not, the packet is for addess resolution; 280 * silently ignore it. 281 */ 282 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 283 nd6_dad_ns_input(ifa); 284 285 goto freeit; 286 } 287 288 /* 289 * If the source address is unspecified address, entries must not 290 * be created or updated. 291 * It looks that sender is performing DAD. Output NA toward 292 * all-node multicast address, to tell the sender that I'm using 293 * the address. 294 * S bit ("solicited") must be zero. 295 */ 296 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 297 struct in6_addr in6_all; 298 299 in6_all = in6addr_linklocal_allnodes; 300 if (in6_setscope(&in6_all, ifp, NULL) != 0) 301 goto bad; 302 nd6_na_output(ifp, &in6_all, &taddr6, 303 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 304 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 305 tlladdr, (struct sockaddr *)proxydl); 306 goto freeit; 307 } 308 309 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 310 ND_NEIGHBOR_SOLICIT, 0); 311 312 nd6_na_output(ifp, &saddr6, &taddr6, 313 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 314 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 315 tlladdr, (struct sockaddr *)proxydl); 316 freeit: 317 m_freem(m); 318 return; 319 320 bad: 321 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 322 ip6_sprintf(ip6bufs, &saddr6))); 323 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 324 ip6_sprintf(ip6bufs, &daddr6))); 325 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 326 ip6_sprintf(ip6bufs, &taddr6))); 327 icmp6stat.icp6s_badns++; 328 m_freem(m); 329 } 330 331 /* 332 * Output a Neighbor Solicitation Message. Caller specifies: 333 * - ICMP6 header source IP6 address 334 * - ND6 header target IP6 address 335 * - ND6 header source datalink address 336 * 337 * Based on RFC 2461 338 * Based on RFC 2462 (duplicate address detection) 339 * 340 * ln - for source address determination 341 * dad - duplicate address detection 342 */ 343 void 344 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 345 const struct in6_addr *taddr6, struct llinfo_nd6 *ln, int dad) 346 { 347 struct mbuf *m; 348 struct ip6_hdr *ip6; 349 struct nd_neighbor_solicit *nd_ns; 350 struct in6_addr *src, src_in; 351 struct ip6_moptions im6o; 352 int icmp6len; 353 int maxlen; 354 caddr_t mac; 355 struct route_in6 ro; 356 357 bzero(&ro, sizeof(ro)); 358 359 if (IN6_IS_ADDR_MULTICAST(taddr6)) 360 return; 361 362 /* estimate the size of message */ 363 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 364 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 365 if (max_linkhdr + maxlen >= MCLBYTES) { 366 #ifdef DIAGNOSTIC 367 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 368 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 369 #endif 370 return; 371 } 372 373 MGETHDR(m, M_DONTWAIT, MT_DATA); 374 if (m && max_linkhdr + maxlen >= MHLEN) { 375 MCLGET(m, M_DONTWAIT); 376 if ((m->m_flags & M_EXT) == 0) { 377 m_free(m); 378 m = NULL; 379 } 380 } 381 if (m == NULL) 382 return; 383 m->m_pkthdr.rcvif = NULL; 384 385 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 386 m->m_flags |= M_MCAST; 387 im6o.im6o_multicast_ifp = ifp; 388 im6o.im6o_multicast_hlim = 255; 389 im6o.im6o_multicast_loop = 0; 390 } 391 392 icmp6len = sizeof(*nd_ns); 393 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 394 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 395 396 /* fill neighbor solicitation packet */ 397 ip6 = mtod(m, struct ip6_hdr *); 398 ip6->ip6_flow = 0; 399 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 400 ip6->ip6_vfc |= IPV6_VERSION; 401 /* ip6->ip6_plen will be set later */ 402 ip6->ip6_nxt = IPPROTO_ICMPV6; 403 ip6->ip6_hlim = 255; 404 if (daddr6) 405 ip6->ip6_dst = *daddr6; 406 else { 407 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 408 ip6->ip6_dst.s6_addr16[1] = 0; 409 ip6->ip6_dst.s6_addr32[1] = 0; 410 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 411 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 412 ip6->ip6_dst.s6_addr8[12] = 0xff; 413 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0) 414 goto bad; 415 } 416 if (!dad) { 417 /* 418 * RFC2461 7.2.2: 419 * "If the source address of the packet prompting the 420 * solicitation is the same as one of the addresses assigned 421 * to the outgoing interface, that address SHOULD be placed 422 * in the IP Source Address of the outgoing solicitation. 423 * Otherwise, any one of the addresses assigned to the 424 * interface should be used." 425 * 426 * We use the source address for the prompting packet 427 * (saddr6), if: 428 * - saddr6 is given from the caller (by giving "ln"), and 429 * - saddr6 belongs to the outgoing interface. 430 * Otherwise, we perform the source address selection as usual. 431 */ 432 struct ip6_hdr *hip6; /* hold ip6 */ 433 struct in6_addr *hsrc = NULL; 434 435 if (ln && ln->ln_hold) { 436 /* 437 * assuming every packet in ln_hold has the same IP 438 * header 439 */ 440 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 441 /* XXX pullup? */ 442 if (sizeof(*hip6) < ln->ln_hold->m_len) 443 hsrc = &hip6->ip6_src; 444 else 445 hsrc = NULL; 446 } 447 if (hsrc && in6ifa_ifpwithaddr(ifp, hsrc)) 448 src = hsrc; 449 else { 450 int error; 451 struct sockaddr_in6 dst_sa; 452 453 bzero(&dst_sa, sizeof(dst_sa)); 454 dst_sa.sin6_family = AF_INET6; 455 dst_sa.sin6_len = sizeof(dst_sa); 456 dst_sa.sin6_addr = ip6->ip6_dst; 457 458 src = in6_selectsrc(&dst_sa, NULL, 459 NULL, &ro, NULL, NULL, &error); 460 if (src == NULL) { 461 char ip6buf[INET6_ADDRSTRLEN]; 462 nd6log((LOG_DEBUG, 463 "nd6_ns_output: source can't be " 464 "determined: dst=%s, error=%d\n", 465 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), 466 error)); 467 goto bad; 468 } 469 } 470 } else { 471 /* 472 * Source address for DAD packet must always be IPv6 473 * unspecified address. (0::0) 474 * We actually don't have to 0-clear the address (we did it 475 * above), but we do so here explicitly to make the intention 476 * clearer. 477 */ 478 bzero(&src_in, sizeof(src_in)); 479 src = &src_in; 480 } 481 ip6->ip6_src = *src; 482 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 483 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 484 nd_ns->nd_ns_code = 0; 485 nd_ns->nd_ns_reserved = 0; 486 nd_ns->nd_ns_target = *taddr6; 487 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 488 489 /* 490 * Add source link-layer address option. 491 * 492 * spec implementation 493 * --- --- 494 * DAD packet MUST NOT do not add the option 495 * there's no link layer address: 496 * impossible do not add the option 497 * there's link layer address: 498 * Multicast NS MUST add one add the option 499 * Unicast NS SHOULD add one add the option 500 */ 501 if (!dad && (mac = nd6_ifptomac(ifp))) { 502 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 503 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 504 /* 8 byte alignments... */ 505 optlen = (optlen + 7) & ~7; 506 507 m->m_pkthdr.len += optlen; 508 m->m_len += optlen; 509 icmp6len += optlen; 510 bzero((caddr_t)nd_opt, optlen); 511 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 512 nd_opt->nd_opt_len = optlen >> 3; 513 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 514 } 515 516 ip6->ip6_plen = htons((u_short)icmp6len); 517 nd_ns->nd_ns_cksum = 0; 518 nd_ns->nd_ns_cksum = 519 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 520 521 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL, NULL); 522 icmp6_ifstat_inc(ifp, ifs6_out_msg); 523 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 524 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 525 526 if (ro.ro_rt) { /* we don't cache this route. */ 527 RTFREE(ro.ro_rt); 528 } 529 return; 530 531 bad: 532 if (ro.ro_rt) { 533 RTFREE(ro.ro_rt); 534 } 535 m_freem(m); 536 return; 537 } 538 539 /* 540 * Neighbor advertisement input handling. 541 * 542 * Based on RFC 2461 543 * Based on RFC 2462 (duplicate address detection) 544 * 545 * the following items are not implemented yet: 546 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 547 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 548 */ 549 void 550 nd6_na_input(struct mbuf *m, int off, int icmp6len) 551 { 552 struct ifnet *ifp = m->m_pkthdr.rcvif; 553 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 554 struct nd_neighbor_advert *nd_na; 555 struct in6_addr daddr6 = ip6->ip6_dst; 556 struct in6_addr taddr6; 557 int flags; 558 int is_router; 559 int is_solicited; 560 int is_override; 561 char *lladdr = NULL; 562 int lladdrlen = 0; 563 struct ifaddr *ifa; 564 struct llinfo_nd6 *ln; 565 struct rtentry *rt; 566 struct sockaddr_dl *sdl; 567 union nd_opts ndopts; 568 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 569 570 if (ip6->ip6_hlim != 255) { 571 nd6log((LOG_ERR, 572 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 573 ip6->ip6_hlim, ip6_sprintf(ip6bufs, &ip6->ip6_src), 574 ip6_sprintf(ip6bufd, &ip6->ip6_dst), if_name(ifp))); 575 goto bad; 576 } 577 578 #ifndef PULLDOWN_TEST 579 IP6_EXTHDR_CHECK(m, off, icmp6len,); 580 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 581 #else 582 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 583 if (nd_na == NULL) { 584 icmp6stat.icp6s_tooshort++; 585 return; 586 } 587 #endif 588 589 flags = nd_na->nd_na_flags_reserved; 590 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 591 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 592 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 593 594 taddr6 = nd_na->nd_na_target; 595 if (in6_setscope(&taddr6, ifp, NULL)) 596 goto bad; /* XXX: impossible */ 597 598 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 599 nd6log((LOG_ERR, 600 "nd6_na_input: invalid target address %s\n", 601 ip6_sprintf(ip6bufs, &taddr6))); 602 goto bad; 603 } 604 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 605 if (is_solicited) { 606 nd6log((LOG_ERR, 607 "nd6_na_input: a solicited adv is multicasted\n")); 608 goto bad; 609 } 610 611 icmp6len -= sizeof(*nd_na); 612 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 613 if (nd6_options(&ndopts) < 0) { 614 nd6log((LOG_INFO, 615 "nd6_na_input: invalid ND option, ignored\n")); 616 /* nd6_options have incremented stats */ 617 goto freeit; 618 } 619 620 if (ndopts.nd_opts_tgt_lladdr) { 621 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 622 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 623 } 624 625 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 626 627 /* 628 * Target address matches one of my interface address. 629 * 630 * If my address is tentative, this means that there's somebody 631 * already using the same address as mine. This indicates DAD failure. 632 * This is defined in RFC 2462. 633 * 634 * Otherwise, process as defined in RFC 2461. 635 */ 636 if (ifa 637 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 638 nd6_dad_na_input(ifa); 639 goto freeit; 640 } 641 642 /* Just for safety, maybe unnecessary. */ 643 if (ifa) { 644 log(LOG_ERR, 645 "nd6_na_input: duplicate IP6 address %s\n", 646 ip6_sprintf(ip6bufs, &taddr6)); 647 goto freeit; 648 } 649 650 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 651 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 652 "(if %d, NA packet %d)\n", ip6_sprintf(ip6bufs, &taddr6), 653 ifp->if_addrlen, lladdrlen - 2)); 654 goto bad; 655 } 656 657 /* 658 * If no neighbor cache entry is found, NA SHOULD silently be 659 * discarded. 660 */ 661 rt = nd6_lookup(&taddr6, 0, ifp); 662 if ((rt == NULL) || 663 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 664 ((sdl = SDL(rt->rt_gateway)) == NULL)) 665 goto freeit; 666 667 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 668 /* 669 * If the link-layer has address, and no lladdr option came, 670 * discard the packet. 671 */ 672 if (ifp->if_addrlen && lladdr == NULL) 673 goto freeit; 674 675 /* 676 * Record link-layer address, and update the state. 677 */ 678 sdl->sdl_alen = ifp->if_addrlen; 679 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 680 if (is_solicited) { 681 ln->ln_state = ND6_LLINFO_REACHABLE; 682 ln->ln_byhint = 0; 683 if (!ND6_LLINFO_PERMANENT(ln)) { 684 nd6_llinfo_settimer(ln, 685 (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 686 } 687 } else { 688 ln->ln_state = ND6_LLINFO_STALE; 689 nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 690 } 691 if ((ln->ln_router = is_router) != 0) { 692 /* 693 * This means a router's state has changed from 694 * non-reachable to probably reachable, and might 695 * affect the status of associated prefixes.. 696 */ 697 pfxlist_onlink_check(); 698 } 699 } else { 700 int llchange; 701 702 /* 703 * Check if the link-layer address has changed or not. 704 */ 705 if (lladdr == NULL) 706 llchange = 0; 707 else { 708 if (sdl->sdl_alen) { 709 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 710 llchange = 1; 711 else 712 llchange = 0; 713 } else 714 llchange = 1; 715 } 716 717 /* 718 * This is VERY complex. Look at it with care. 719 * 720 * override solicit lladdr llchange action 721 * (L: record lladdr) 722 * 723 * 0 0 n -- (2c) 724 * 0 0 y n (2b) L 725 * 0 0 y y (1) REACHABLE->STALE 726 * 0 1 n -- (2c) *->REACHABLE 727 * 0 1 y n (2b) L *->REACHABLE 728 * 0 1 y y (1) REACHABLE->STALE 729 * 1 0 n -- (2a) 730 * 1 0 y n (2a) L 731 * 1 0 y y (2a) L *->STALE 732 * 1 1 n -- (2a) *->REACHABLE 733 * 1 1 y n (2a) L *->REACHABLE 734 * 1 1 y y (2a) L *->REACHABLE 735 */ 736 if (!is_override && (lladdr != NULL && llchange)) { /* (1) */ 737 /* 738 * If state is REACHABLE, make it STALE. 739 * no other updates should be done. 740 */ 741 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 742 ln->ln_state = ND6_LLINFO_STALE; 743 nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 744 } 745 goto freeit; 746 } else if (is_override /* (2a) */ 747 || (!is_override && (lladdr != NULL && !llchange)) /* (2b) */ 748 || lladdr == NULL) { /* (2c) */ 749 /* 750 * Update link-local address, if any. 751 */ 752 if (lladdr != NULL) { 753 sdl->sdl_alen = ifp->if_addrlen; 754 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 755 } 756 757 /* 758 * If solicited, make the state REACHABLE. 759 * If not solicited and the link-layer address was 760 * changed, make it STALE. 761 */ 762 if (is_solicited) { 763 ln->ln_state = ND6_LLINFO_REACHABLE; 764 ln->ln_byhint = 0; 765 if (!ND6_LLINFO_PERMANENT(ln)) { 766 nd6_llinfo_settimer(ln, 767 (long)ND_IFINFO(ifp)->reachable * hz); 768 } 769 } else { 770 if (lladdr != NULL && llchange) { 771 ln->ln_state = ND6_LLINFO_STALE; 772 nd6_llinfo_settimer(ln, 773 (long)nd6_gctimer * hz); 774 } 775 } 776 } 777 778 if (ln->ln_router && !is_router) { 779 /* 780 * The peer dropped the router flag. 781 * Remove the sender from the Default Router List and 782 * update the Destination Cache entries. 783 */ 784 struct nd_defrouter *dr; 785 struct in6_addr *in6; 786 int s; 787 788 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 789 790 /* 791 * Lock to protect the default router list. 792 * XXX: this might be unnecessary, since this function 793 * is only called under the network software interrupt 794 * context. However, we keep it just for safety. 795 */ 796 s = splnet(); 797 dr = defrouter_lookup(in6, ifp); 798 if (dr) 799 defrtrlist_del(dr); 800 else if (!ip6_forwarding) { 801 /* 802 * Even if the neighbor is not in the default 803 * router list, the neighbor may be used 804 * as a next hop for some destinations 805 * (e.g. redirect case). So we must 806 * call rt6_flush explicitly. 807 */ 808 rt6_flush(&ip6->ip6_src, ifp); 809 } 810 splx(s); 811 } 812 ln->ln_router = is_router; 813 } 814 rt->rt_flags &= ~RTF_REJECT; 815 ln->ln_asked = 0; 816 if (ln->ln_hold) { 817 struct mbuf *m_hold, *m_hold_next; 818 819 /* 820 * reset the ln_hold in advance, to explicitly 821 * prevent a ln_hold lookup in nd6_output() 822 * (wouldn't happen, though...) 823 */ 824 for (m_hold = ln->ln_hold; 825 m_hold; m_hold = m_hold_next) { 826 m_hold_next = m_hold->m_nextpkt; 827 m_hold->m_nextpkt = NULL; 828 /* 829 * we assume ifp is not a loopback here, so just set 830 * the 2nd argument as the 1st one. 831 */ 832 nd6_output(ifp, ifp, m_hold, 833 (struct sockaddr_in6 *)rt_key(rt), rt); 834 } 835 ln->ln_hold = NULL; 836 } 837 838 freeit: 839 m_freem(m); 840 return; 841 842 bad: 843 icmp6stat.icp6s_badna++; 844 m_freem(m); 845 } 846 847 /* 848 * Neighbor advertisement output handling. 849 * 850 * Based on RFC 2461 851 * 852 * the following items are not implemented yet: 853 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 854 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 855 * 856 * tlladdr - 1 if include target link-layer address 857 * sdl0 - sockaddr_dl (= proxy NA) or NULL 858 */ 859 void 860 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6_0, 861 const struct in6_addr *taddr6, u_long flags, int tlladdr, 862 struct sockaddr *sdl0) 863 { 864 struct mbuf *m; 865 struct ip6_hdr *ip6; 866 struct nd_neighbor_advert *nd_na; 867 struct ip6_moptions im6o; 868 struct in6_addr *src, daddr6; 869 struct sockaddr_in6 dst_sa; 870 int icmp6len, maxlen, error; 871 caddr_t mac = NULL; 872 struct route_in6 ro; 873 874 bzero(&ro, sizeof(ro)); 875 876 daddr6 = *daddr6_0; /* make a local copy for modification */ 877 878 /* estimate the size of message */ 879 maxlen = sizeof(*ip6) + sizeof(*nd_na); 880 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 881 if (max_linkhdr + maxlen >= MCLBYTES) { 882 #ifdef DIAGNOSTIC 883 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 884 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 885 #endif 886 return; 887 } 888 889 MGETHDR(m, M_DONTWAIT, MT_DATA); 890 if (m && max_linkhdr + maxlen >= MHLEN) { 891 MCLGET(m, M_DONTWAIT); 892 if ((m->m_flags & M_EXT) == 0) { 893 m_free(m); 894 m = NULL; 895 } 896 } 897 if (m == NULL) 898 return; 899 m->m_pkthdr.rcvif = NULL; 900 901 if (IN6_IS_ADDR_MULTICAST(&daddr6)) { 902 m->m_flags |= M_MCAST; 903 im6o.im6o_multicast_ifp = ifp; 904 im6o.im6o_multicast_hlim = 255; 905 im6o.im6o_multicast_loop = 0; 906 } 907 908 icmp6len = sizeof(*nd_na); 909 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 910 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 911 912 /* fill neighbor advertisement packet */ 913 ip6 = mtod(m, struct ip6_hdr *); 914 ip6->ip6_flow = 0; 915 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 916 ip6->ip6_vfc |= IPV6_VERSION; 917 ip6->ip6_nxt = IPPROTO_ICMPV6; 918 ip6->ip6_hlim = 255; 919 if (IN6_IS_ADDR_UNSPECIFIED(&daddr6)) { 920 /* reply to DAD */ 921 daddr6.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 922 daddr6.s6_addr16[1] = 0; 923 daddr6.s6_addr32[1] = 0; 924 daddr6.s6_addr32[2] = 0; 925 daddr6.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 926 if (in6_setscope(&daddr6, ifp, NULL)) 927 goto bad; 928 929 flags &= ~ND_NA_FLAG_SOLICITED; 930 } 931 ip6->ip6_dst = daddr6; 932 bzero(&dst_sa, sizeof(struct sockaddr_in6)); 933 dst_sa.sin6_family = AF_INET6; 934 dst_sa.sin6_len = sizeof(struct sockaddr_in6); 935 dst_sa.sin6_addr = daddr6; 936 937 /* 938 * Select a source whose scope is the same as that of the dest. 939 */ 940 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 941 src = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, NULL, &error); 942 if (src == NULL) { 943 char ip6buf[INET6_ADDRSTRLEN]; 944 nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 945 "determined: dst=%s, error=%d\n", 946 ip6_sprintf(ip6buf, &dst_sa.sin6_addr), error)); 947 goto bad; 948 } 949 ip6->ip6_src = *src; 950 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 951 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 952 nd_na->nd_na_code = 0; 953 nd_na->nd_na_target = *taddr6; 954 in6_clearscope(&nd_na->nd_na_target); /* XXX */ 955 956 /* 957 * "tlladdr" indicates NS's condition for adding tlladdr or not. 958 * see nd6_ns_input() for details. 959 * Basically, if NS packet is sent to unicast/anycast addr, 960 * target lladdr option SHOULD NOT be included. 961 */ 962 if (tlladdr) { 963 /* 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. 967 */ 968 if (sdl0 == NULL) { 969 #ifdef DEV_CARP 970 if (ifp->if_carp) 971 mac = carp_macmatch6(ifp->if_carp, m, taddr6); 972 if (mac == NULL) 973 mac = nd6_ifptomac(ifp); 974 #else 975 mac = nd6_ifptomac(ifp); 976 #endif 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) 981 mac = LLADDR(sdl); 982 } 983 } 984 if (tlladdr && mac) { 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); 987 988 /* roundup to 8 bytes alignment! */ 989 optlen = (optlen + 7) & ~7; 990 991 m->m_pkthdr.len += optlen; 992 m->m_len += optlen; 993 icmp6len += 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); 998 } else 999 flags &= ~ND_NA_FLAG_OVERRIDE; 1000 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); 1006 1007 ip6_output(m, NULL, &ro, 0, &im6o, NULL, NULL); 1008 icmp6_ifstat_inc(ifp, ifs6_out_msg); 1009 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 1010 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 1011 1012 if (ro.ro_rt) { /* we don't cache this route. */ 1013 RTFREE(ro.ro_rt); 1014 } 1015 return; 1016 1017 bad: 1018 if (ro.ro_rt) { 1019 RTFREE(ro.ro_rt); 1020 } 1021 m_freem(m); 1022 return; 1023 } 1024 1025 caddr_t 1026 nd6_ifptomac(struct ifnet *ifp) 1027 { 1028 switch (ifp->if_type) { 1029 case IFT_ARCNET: 1030 case IFT_ETHER: 1031 case IFT_FDDI: 1032 case IFT_IEEE1394: 1033 #ifdef IFT_L2VLAN 1034 case IFT_L2VLAN: 1035 #endif 1036 #ifdef IFT_IEEE80211 1037 case IFT_IEEE80211: 1038 #endif 1039 #ifdef IFT_CARP 1040 case IFT_CARP: 1041 #endif 1042 case IFT_BRIDGE: 1043 case IFT_ISO88025: 1044 return IF_LLADDR(ifp); 1045 default: 1046 return NULL; 1047 } 1048 } 1049 1050 TAILQ_HEAD(dadq_head, dadq); 1051 struct dadq { 1052 TAILQ_ENTRY(dadq) dad_list; 1053 struct ifaddr *dad_ifa; 1054 int dad_count; /* max NS to send */ 1055 int dad_ns_tcount; /* # of trials to send NS */ 1056 int dad_ns_ocount; /* NS sent so far */ 1057 int dad_ns_icount; 1058 int dad_na_icount; 1059 struct callout dad_timer_ch; 1060 }; 1061 1062 static struct dadq_head dadq; 1063 static int dad_init = 0; 1064 1065 static struct dadq * 1066 nd6_dad_find(struct ifaddr *ifa) 1067 { 1068 struct dadq *dp; 1069 1070 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 1071 if (dp->dad_ifa == ifa) 1072 return dp; 1073 } 1074 return NULL; 1075 } 1076 1077 static void 1078 nd6_dad_starttimer(struct dadq *dp, int ticks) 1079 { 1080 1081 callout_reset(&dp->dad_timer_ch, ticks, 1082 (void (*)(void *))nd6_dad_timer, (void *)dp->dad_ifa); 1083 } 1084 1085 static void 1086 nd6_dad_stoptimer(struct dadq *dp) 1087 { 1088 1089 callout_stop(&dp->dad_timer_ch); 1090 } 1091 1092 /* 1093 * Start Duplicate Address Detection (DAD) for specified interface address. 1094 */ 1095 void 1096 nd6_dad_start(struct ifaddr *ifa, int delay) 1097 { 1098 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1099 struct dadq *dp; 1100 char ip6buf[INET6_ADDRSTRLEN]; 1101 1102 if (!dad_init) { 1103 TAILQ_INIT(&dadq); 1104 dad_init++; 1105 } 1106 1107 /* 1108 * If we don't need DAD, don't do it. 1109 * There are several cases: 1110 * - DAD is disabled (ip6_dad_count == 0) 1111 * - the interface address is anycast 1112 */ 1113 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1114 log(LOG_DEBUG, 1115 "nd6_dad_start: called with non-tentative address " 1116 "%s(%s)\n", 1117 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 1118 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1119 return; 1120 } 1121 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1122 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1123 return; 1124 } 1125 if (!ip6_dad_count) { 1126 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1127 return; 1128 } 1129 if (ifa->ifa_ifp == NULL) 1130 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1131 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 1132 return; 1133 } 1134 if (nd6_dad_find(ifa) != NULL) { 1135 /* DAD already in progress */ 1136 return; 1137 } 1138 1139 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1140 if (dp == NULL) { 1141 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1142 "%s(%s)\n", 1143 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 1144 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1145 return; 1146 } 1147 bzero(dp, sizeof(*dp)); 1148 callout_init(&dp->dad_timer_ch, 0); 1149 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1150 1151 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1152 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1153 1154 /* 1155 * Send NS packet for DAD, ip6_dad_count times. 1156 * Note that we must delay the first transmission, if this is the 1157 * first packet to be sent from the interface after interface 1158 * (re)initialization. 1159 */ 1160 dp->dad_ifa = ifa; 1161 IFAREF(ifa); /* just for safety */ 1162 dp->dad_count = ip6_dad_count; 1163 dp->dad_ns_icount = dp->dad_na_icount = 0; 1164 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1165 if (delay == 0) { 1166 nd6_dad_ns_output(dp, ifa); 1167 nd6_dad_starttimer(dp, 1168 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1169 } else { 1170 nd6_dad_starttimer(dp, delay); 1171 } 1172 } 1173 1174 /* 1175 * terminate DAD unconditionally. used for address removals. 1176 */ 1177 void 1178 nd6_dad_stop(struct ifaddr *ifa) 1179 { 1180 struct dadq *dp; 1181 1182 if (!dad_init) 1183 return; 1184 dp = nd6_dad_find(ifa); 1185 if (!dp) { 1186 /* DAD wasn't started yet */ 1187 return; 1188 } 1189 1190 nd6_dad_stoptimer(dp); 1191 1192 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1193 free(dp, M_IP6NDP); 1194 dp = NULL; 1195 IFAFREE(ifa); 1196 } 1197 1198 static void 1199 nd6_dad_timer(struct ifaddr *ifa) 1200 { 1201 int s; 1202 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1203 struct dadq *dp; 1204 char ip6buf[INET6_ADDRSTRLEN]; 1205 1206 s = splnet(); /* XXX */ 1207 1208 /* Sanity check */ 1209 if (ia == NULL) { 1210 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1211 goto done; 1212 } 1213 dp = nd6_dad_find(ifa); 1214 if (dp == NULL) { 1215 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1216 goto done; 1217 } 1218 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1219 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1220 "%s(%s)\n", 1221 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 1222 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1223 goto done; 1224 } 1225 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1226 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1227 "%s(%s)\n", 1228 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 1229 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1230 goto done; 1231 } 1232 1233 /* timeouted with IFF_{RUNNING,UP} check */ 1234 if (dp->dad_ns_tcount > dad_maxtry) { 1235 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1236 if_name(ifa->ifa_ifp))); 1237 1238 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1239 free(dp, M_IP6NDP); 1240 dp = NULL; 1241 IFAFREE(ifa); 1242 goto done; 1243 } 1244 1245 /* Need more checks? */ 1246 if (dp->dad_ns_ocount < dp->dad_count) { 1247 /* 1248 * We have more NS to go. Send NS packet for DAD. 1249 */ 1250 nd6_dad_ns_output(dp, ifa); 1251 nd6_dad_starttimer(dp, 1252 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1253 } else { 1254 /* 1255 * We have transmitted sufficient number of DAD packets. 1256 * See what we've got. 1257 */ 1258 int duplicate; 1259 1260 duplicate = 0; 1261 1262 if (dp->dad_na_icount) { 1263 /* 1264 * the check is in nd6_dad_na_input(), 1265 * but just in case 1266 */ 1267 duplicate++; 1268 } 1269 1270 if (dp->dad_ns_icount) { 1271 /* We've seen NS, means DAD has failed. */ 1272 duplicate++; 1273 } 1274 1275 if (duplicate) { 1276 /* (*dp) will be freed in nd6_dad_duplicated() */ 1277 dp = NULL; 1278 nd6_dad_duplicated(ifa); 1279 } else { 1280 /* 1281 * We are done with DAD. No NA came, no NS came. 1282 * No duplicate address found. 1283 */ 1284 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1285 1286 nd6log((LOG_DEBUG, 1287 "%s: DAD complete for %s - no duplicates found\n", 1288 if_name(ifa->ifa_ifp), 1289 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr))); 1290 1291 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1292 free(dp, M_IP6NDP); 1293 dp = NULL; 1294 IFAFREE(ifa); 1295 } 1296 } 1297 1298 done: 1299 splx(s); 1300 } 1301 1302 void 1303 nd6_dad_duplicated(struct ifaddr *ifa) 1304 { 1305 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1306 struct ifnet *ifp; 1307 struct dadq *dp; 1308 char ip6buf[INET6_ADDRSTRLEN]; 1309 1310 dp = nd6_dad_find(ifa); 1311 if (dp == NULL) { 1312 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1313 return; 1314 } 1315 1316 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1317 "NS in/out=%d/%d, NA in=%d\n", 1318 if_name(ifa->ifa_ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr), 1319 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1320 1321 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1322 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1323 1324 /* We are done with DAD, with duplicate address found. (failure) */ 1325 nd6_dad_stoptimer(dp); 1326 1327 ifp = ifa->ifa_ifp; 1328 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1329 if_name(ifp), ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)); 1330 log(LOG_ERR, "%s: manual intervention required\n", 1331 if_name(ifp)); 1332 1333 /* 1334 * If the address is a link-local address formed from an interface 1335 * identifier based on the hardware address which is supposed to be 1336 * uniquely assigned (e.g., EUI-64 for an Ethernet interface), IP 1337 * operation on the interface SHOULD be disabled. 1338 * [rfc2462bis-03 Section 5.4.5] 1339 */ 1340 if (IN6_IS_ADDR_LINKLOCAL(&ia->ia_addr.sin6_addr)) { 1341 struct in6_addr in6; 1342 1343 /* 1344 * To avoid over-reaction, we only apply this logic when we are 1345 * very sure that hardware addresses are supposed to be unique. 1346 */ 1347 switch (ifp->if_type) { 1348 case IFT_ETHER: 1349 case IFT_FDDI: 1350 case IFT_ATM: 1351 case IFT_IEEE1394: 1352 #ifdef IFT_IEEE80211 1353 case IFT_IEEE80211: 1354 #endif 1355 in6 = ia->ia_addr.sin6_addr; 1356 if (in6_get_hw_ifid(ifp, &in6) == 0 && 1357 IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &in6)) { 1358 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 1359 log(LOG_ERR, "%s: possible hardware address " 1360 "duplication detected, disable IPv6\n", 1361 if_name(ifp)); 1362 } 1363 break; 1364 } 1365 } 1366 1367 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1368 free(dp, M_IP6NDP); 1369 dp = NULL; 1370 IFAFREE(ifa); 1371 } 1372 1373 static void 1374 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 1375 { 1376 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1377 struct ifnet *ifp = ifa->ifa_ifp; 1378 1379 dp->dad_ns_tcount++; 1380 if ((ifp->if_flags & IFF_UP) == 0) { 1381 return; 1382 } 1383 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1384 return; 1385 } 1386 1387 dp->dad_ns_ocount++; 1388 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1389 } 1390 1391 static void 1392 nd6_dad_ns_input(struct ifaddr *ifa) 1393 { 1394 struct in6_ifaddr *ia; 1395 struct ifnet *ifp; 1396 const struct in6_addr *taddr6; 1397 struct dadq *dp; 1398 int duplicate; 1399 1400 if (ifa == NULL) 1401 panic("ifa == NULL in nd6_dad_ns_input"); 1402 1403 ia = (struct in6_ifaddr *)ifa; 1404 ifp = ifa->ifa_ifp; 1405 taddr6 = &ia->ia_addr.sin6_addr; 1406 duplicate = 0; 1407 dp = nd6_dad_find(ifa); 1408 1409 /* Quickhack - completely ignore DAD NS packets */ 1410 if (dad_ignore_ns) { 1411 char ip6buf[INET6_ADDRSTRLEN]; 1412 nd6log((LOG_INFO, 1413 "nd6_dad_ns_input: ignoring DAD NS packet for " 1414 "address %s(%s)\n", ip6_sprintf(ip6buf, taddr6), 1415 if_name(ifa->ifa_ifp))); 1416 return; 1417 } 1418 1419 /* 1420 * if I'm yet to start DAD, someone else started using this address 1421 * first. I have a duplicate and you win. 1422 */ 1423 if (dp == NULL || dp->dad_ns_ocount == 0) 1424 duplicate++; 1425 1426 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1427 1428 if (duplicate) { 1429 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1430 nd6_dad_duplicated(ifa); 1431 } else { 1432 /* 1433 * not sure if I got a duplicate. 1434 * increment ns count and see what happens. 1435 */ 1436 if (dp) 1437 dp->dad_ns_icount++; 1438 } 1439 } 1440 1441 static void 1442 nd6_dad_na_input(struct ifaddr *ifa) 1443 { 1444 struct dadq *dp; 1445 1446 if (ifa == NULL) 1447 panic("ifa == NULL in nd6_dad_na_input"); 1448 1449 dp = nd6_dad_find(ifa); 1450 if (dp) 1451 dp->dad_na_icount++; 1452 1453 /* remove the address. */ 1454 nd6_dad_duplicated(ifa); 1455 } 1456