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 a 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 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) { 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(&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(&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 * duplicated 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 saddr6 = in6addr_linklocal_allnodes; 298 saddr6.s6_addr16[1] = htons(ifp->if_index); 299 nd6_na_output(ifp, &saddr6, &taddr6, 300 ((anycast || proxy || !tlladdr) ? 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, 307 ND_NEIGHBOR_SOLICIT, 0); 308 309 nd6_na_output(ifp, &saddr6, &taddr6, 310 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 311 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | 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 a 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 /* 408 * RFC2461 7.2.2: 409 * "If the source address of the packet prompting the 410 * solicitation is the same as one of the addresses assigned 411 * to the outgoing interface, that address SHOULD be placed 412 * in the IP Source Address of the outgoing solicitation. 413 * Otherwise, any one of the addresses assigned to the 414 * interface should be used." 415 * 416 * We use the source address for the prompting packet 417 * (saddr6), if: 418 * - saddr6 is given from the caller (by giving "ln"), and 419 * - saddr6 belongs to the outgoing interface. 420 * Otherwise, we perform a scope-wise match. 421 */ 422 struct ip6_hdr *hip6; /* hold ip6 */ 423 struct in6_addr *saddr6; 424 425 if (ln && ln->ln_hold) { 426 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 427 /* XXX pullup? */ 428 if (sizeof(*hip6) < ln->ln_hold->m_len) 429 saddr6 = &hip6->ip6_src; 430 else 431 saddr6 = NULL; 432 } else 433 saddr6 = NULL; 434 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 435 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 436 else { 437 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 438 if (ia == NULL) { 439 m_freem(m); 440 return; 441 } 442 ip6->ip6_src = ia->ia_addr.sin6_addr; 443 } 444 } else { 445 /* 446 * Source address for DAD packet must always be IPv6 447 * unspecified address. (0::0) 448 */ 449 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 450 } 451 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 452 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 453 nd_ns->nd_ns_code = 0; 454 nd_ns->nd_ns_reserved = 0; 455 nd_ns->nd_ns_target = *taddr6; 456 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 457 458 /* 459 * Add source link-layer address option. 460 * 461 * spec implementation 462 * --- --- 463 * DAD packet MUST NOT do not add the option 464 * there's no link layer address: 465 * impossible do not add the option 466 * there's link layer address: 467 * Multicast NS MUST add one add the option 468 * Unicast NS SHOULD add one add the option 469 */ 470 if (!dad && (mac = nd6_ifptomac(ifp))) { 471 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 472 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 473 /* 8 byte alignments... */ 474 optlen = (optlen + 7) & ~7; 475 476 m->m_pkthdr.len += optlen; 477 m->m_len += optlen; 478 icmp6len += optlen; 479 bzero((caddr_t)nd_opt, optlen); 480 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 481 nd_opt->nd_opt_len = optlen >> 3; 482 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 483 } 484 485 ip6->ip6_plen = htons((u_short)icmp6len); 486 nd_ns->nd_ns_cksum = 0; 487 nd_ns->nd_ns_cksum = 488 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 489 490 #ifdef IPSEC 491 /* Don't lookup socket */ 492 (void)ipsec_setsocket(m, NULL); 493 #endif 494 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL); 495 if (outif) { 496 icmp6_ifstat_inc(outif, ifs6_out_msg); 497 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); 498 } 499 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 500 } 501 502 /* 503 * Neighbor advertisement input handling. 504 * 505 * Based on RFC 2461 506 * Based on RFC 2462 (duplicated address detection) 507 * 508 * the following items are not implemented yet: 509 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 510 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 511 */ 512 void 513 nd6_na_input(m, off, icmp6len) 514 struct mbuf *m; 515 int off, icmp6len; 516 { 517 struct ifnet *ifp = m->m_pkthdr.rcvif; 518 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 519 struct nd_neighbor_advert *nd_na; 520 struct in6_addr daddr6 = ip6->ip6_dst; 521 struct in6_addr taddr6; 522 int flags; 523 int is_router; 524 int is_solicited; 525 int is_override; 526 char *lladdr = NULL; 527 int lladdrlen = 0; 528 struct ifaddr *ifa; 529 struct llinfo_nd6 *ln; 530 struct rtentry *rt; 531 struct sockaddr_dl *sdl; 532 union nd_opts ndopts; 533 534 if (ip6->ip6_hlim != 255) { 535 nd6log((LOG_ERR, 536 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 537 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 538 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 539 goto bad; 540 } 541 542 #ifndef PULLDOWN_TEST 543 IP6_EXTHDR_CHECK(m, off, icmp6len,); 544 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 545 #else 546 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 547 if (nd_na == NULL) { 548 icmp6stat.icp6s_tooshort++; 549 return; 550 } 551 #endif 552 taddr6 = nd_na->nd_na_target; 553 flags = nd_na->nd_na_flags_reserved; 554 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 555 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 556 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 557 558 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 559 taddr6.s6_addr16[1] = htons(ifp->if_index); 560 561 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 562 nd6log((LOG_ERR, 563 "nd6_na_input: invalid target address %s\n", 564 ip6_sprintf(&taddr6))); 565 goto bad; 566 } 567 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 568 if (is_solicited) { 569 nd6log((LOG_ERR, 570 "nd6_na_input: a solicited adv is multicasted\n")); 571 goto bad; 572 } 573 574 icmp6len -= sizeof(*nd_na); 575 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 576 if (nd6_options(&ndopts) < 0) { 577 nd6log((LOG_INFO, 578 "nd6_na_input: invalid ND option, ignored\n")); 579 /* nd6_options have incremented stats */ 580 goto freeit; 581 } 582 583 if (ndopts.nd_opts_tgt_lladdr) { 584 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 585 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 586 } 587 588 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 589 590 /* 591 * Target address matches one of my interface address. 592 * 593 * If my address is tentative, this means that there's somebody 594 * already using the same address as mine. This indicates DAD failure. 595 * This is defined in RFC 2462. 596 * 597 * Otherwise, process as defined in RFC 2461. 598 */ 599 if (ifa 600 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 601 nd6_dad_na_input(ifa); 602 goto freeit; 603 } 604 605 /* Just for safety, maybe unnecessary. */ 606 if (ifa) { 607 log(LOG_ERR, 608 "nd6_na_input: duplicate IP6 address %s\n", 609 ip6_sprintf(&taddr6)); 610 goto freeit; 611 } 612 613 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 614 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 615 "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6), 616 ifp->if_addrlen, lladdrlen - 2)); 617 goto bad; 618 } 619 620 /* 621 * If no neighbor cache entry is found, NA SHOULD silently be 622 * discarded. 623 */ 624 rt = nd6_lookup(&taddr6, 0, ifp); 625 if ((rt == NULL) || 626 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 627 ((sdl = SDL(rt->rt_gateway)) == NULL)) 628 goto freeit; 629 630 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 631 /* 632 * If the link-layer has address, and no lladdr option came, 633 * discard the packet. 634 */ 635 if (ifp->if_addrlen && !lladdr) 636 goto freeit; 637 638 /* 639 * Record link-layer address, and update the state. 640 */ 641 sdl->sdl_alen = ifp->if_addrlen; 642 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 643 if (is_solicited) { 644 ln->ln_state = ND6_LLINFO_REACHABLE; 645 ln->ln_byhint = 0; 646 if (ln->ln_expire) { 647 ln->ln_expire = time_second + 648 ND_IFINFO(rt->rt_ifp)->reachable; 649 } 650 } else { 651 ln->ln_state = ND6_LLINFO_STALE; 652 ln->ln_expire = time_second + nd6_gctimer; 653 } 654 if ((ln->ln_router = is_router) != 0) { 655 /* 656 * This means a router's state has changed from 657 * non-reachable to probably reachable, and might 658 * affect the status of associated prefixes.. 659 */ 660 pfxlist_onlink_check(); 661 } 662 } else { 663 int llchange; 664 665 /* 666 * Check if the link-layer address has changed or not. 667 */ 668 if (!lladdr) 669 llchange = 0; 670 else { 671 if (sdl->sdl_alen) { 672 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 673 llchange = 1; 674 else 675 llchange = 0; 676 } else 677 llchange = 1; 678 } 679 680 /* 681 * This is VERY complex. Look at it with care. 682 * 683 * override solicit lladdr llchange action 684 * (L: record lladdr) 685 * 686 * 0 0 n -- (2c) 687 * 0 0 y n (2b) L 688 * 0 0 y y (1) REACHABLE->STALE 689 * 0 1 n -- (2c) *->REACHABLE 690 * 0 1 y n (2b) L *->REACHABLE 691 * 0 1 y y (1) REACHABLE->STALE 692 * 1 0 n -- (2a) 693 * 1 0 y n (2a) L 694 * 1 0 y y (2a) L *->STALE 695 * 1 1 n -- (2a) *->REACHABLE 696 * 1 1 y n (2a) L *->REACHABLE 697 * 1 1 y y (2a) L *->REACHABLE 698 */ 699 if (!is_override && (lladdr && llchange)) { /* (1) */ 700 /* 701 * If state is REACHABLE, make it STALE. 702 * no other updates should be done. 703 */ 704 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 705 ln->ln_state = ND6_LLINFO_STALE; 706 ln->ln_expire = time_second + nd6_gctimer; 707 } 708 goto freeit; 709 } else if (is_override /* (2a) */ 710 || (!is_override && (lladdr && !llchange)) /* (2b) */ 711 || !lladdr) { /* (2c) */ 712 /* 713 * Update link-local address, if any. 714 */ 715 if (lladdr) { 716 sdl->sdl_alen = ifp->if_addrlen; 717 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 718 } 719 720 /* 721 * If solicited, make the state REACHABLE. 722 * If not solicited and the link-layer address was 723 * changed, make it STALE. 724 */ 725 if (is_solicited) { 726 ln->ln_state = ND6_LLINFO_REACHABLE; 727 ln->ln_byhint = 0; 728 if (ln->ln_expire) { 729 ln->ln_expire = time_second + 730 ND_IFINFO(ifp)->reachable; 731 } 732 } else { 733 if (lladdr && llchange) { 734 ln->ln_state = ND6_LLINFO_STALE; 735 ln->ln_expire = time_second + nd6_gctimer; 736 } 737 } 738 } 739 740 if (ln->ln_router && !is_router) { 741 /* 742 * The peer dropped the router flag. 743 * Remove the sender from the Default Router List and 744 * update the Destination Cache entries. 745 */ 746 struct nd_defrouter *dr; 747 struct in6_addr *in6; 748 int s; 749 750 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 751 752 /* 753 * Lock to protect the default router list. 754 * XXX: this might be unnecessary, since this function 755 * is only called under the network software interrupt 756 * context. However, we keep it just for safety. 757 */ 758 s = splnet(); 759 dr = defrouter_lookup(in6, rt->rt_ifp); 760 if (dr) 761 defrtrlist_del(dr); 762 else if (!ip6_forwarding && ip6_accept_rtadv) { 763 /* 764 * Even if the neighbor is not in the default 765 * router list, the neighbor may be used 766 * as a next hop for some destinations 767 * (e.g. redirect case). So we must 768 * call rt6_flush explicitly. 769 */ 770 rt6_flush(&ip6->ip6_src, rt->rt_ifp); 771 } 772 splx(s); 773 } 774 ln->ln_router = is_router; 775 } 776 rt->rt_flags &= ~RTF_REJECT; 777 ln->ln_asked = 0; 778 if (ln->ln_hold) { 779 /* 780 * we assume ifp is not a loopback here, so just set the 2nd 781 * argument as the 1st one. 782 */ 783 nd6_output(ifp, ifp, ln->ln_hold, 784 (struct sockaddr_in6 *)rt_key(rt), rt); 785 ln->ln_hold = NULL; 786 } 787 788 freeit: 789 m_freem(m); 790 return; 791 792 bad: 793 icmp6stat.icp6s_badna++; 794 m_freem(m); 795 } 796 797 /* 798 * Neighbor advertisement output handling. 799 * 800 * Based on RFC 2461 801 * 802 * the following items are not implemented yet: 803 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 804 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 805 */ 806 void 807 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 808 struct ifnet *ifp; 809 const struct in6_addr *daddr6, *taddr6; 810 u_long flags; 811 int tlladdr; /* 1 if include target link-layer address */ 812 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 813 { 814 struct mbuf *m; 815 struct ip6_hdr *ip6; 816 struct nd_neighbor_advert *nd_na; 817 struct in6_ifaddr *ia = NULL; 818 struct ip6_moptions im6o; 819 int icmp6len; 820 int maxlen; 821 caddr_t mac = NULL; 822 struct ifnet *outif = NULL; 823 824 /* estimate the size of message */ 825 maxlen = sizeof(*ip6) + sizeof(*nd_na); 826 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 827 if (max_linkhdr + maxlen >= MCLBYTES) { 828 #ifdef DIAGNOSTIC 829 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 830 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 831 #endif 832 return; 833 } 834 835 MGETHDR(m, M_DONTWAIT, MT_DATA); 836 if (m && max_linkhdr + maxlen >= MHLEN) { 837 MCLGET(m, M_DONTWAIT); 838 if ((m->m_flags & M_EXT) == 0) { 839 m_free(m); 840 m = NULL; 841 } 842 } 843 if (m == NULL) 844 return; 845 m->m_pkthdr.rcvif = NULL; 846 847 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 848 m->m_flags |= M_MCAST; 849 im6o.im6o_multicast_ifp = ifp; 850 im6o.im6o_multicast_hlim = 255; 851 im6o.im6o_multicast_loop = 0; 852 } 853 854 icmp6len = sizeof(*nd_na); 855 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 856 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 857 858 /* fill neighbor advertisement packet */ 859 ip6 = mtod(m, struct ip6_hdr *); 860 ip6->ip6_flow = 0; 861 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 862 ip6->ip6_vfc |= IPV6_VERSION; 863 ip6->ip6_nxt = IPPROTO_ICMPV6; 864 ip6->ip6_hlim = 255; 865 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 866 /* reply to DAD */ 867 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 868 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 869 ip6->ip6_dst.s6_addr32[1] = 0; 870 ip6->ip6_dst.s6_addr32[2] = 0; 871 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 872 flags &= ~ND_NA_FLAG_SOLICITED; 873 } else 874 ip6->ip6_dst = *daddr6; 875 876 /* 877 * Select a source whose scope is the same as that of the dest. 878 */ 879 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 880 if (ia == NULL) { 881 m_freem(m); 882 return; 883 } 884 ip6->ip6_src = ia->ia_addr.sin6_addr; 885 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 886 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 887 nd_na->nd_na_code = 0; 888 nd_na->nd_na_target = *taddr6; 889 in6_clearscope(&nd_na->nd_na_target); /* XXX */ 890 891 /* 892 * "tlladdr" indicates NS's condition for adding tlladdr or not. 893 * see nd6_ns_input() for details. 894 * Basically, if NS packet is sent to unicast/anycast addr, 895 * target lladdr option SHOULD NOT be included. 896 */ 897 if (tlladdr) { 898 /* 899 * sdl0 != NULL indicates proxy NA. If we do proxy, use 900 * lladdr in sdl0. If we are not proxying (sending NA for 901 * my address) use lladdr configured for the interface. 902 */ 903 if (sdl0 == NULL) 904 mac = nd6_ifptomac(ifp); 905 else if (sdl0->sa_family == AF_LINK) { 906 struct sockaddr_dl *sdl; 907 sdl = (struct sockaddr_dl *)sdl0; 908 if (sdl->sdl_alen == ifp->if_addrlen) 909 mac = LLADDR(sdl); 910 } 911 } 912 if (tlladdr && mac) { 913 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 914 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 915 916 /* roundup to 8 bytes alignment! */ 917 optlen = (optlen + 7) & ~7; 918 919 m->m_pkthdr.len += optlen; 920 m->m_len += optlen; 921 icmp6len += optlen; 922 bzero((caddr_t)nd_opt, optlen); 923 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 924 nd_opt->nd_opt_len = optlen >> 3; 925 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 926 } else 927 flags &= ~ND_NA_FLAG_OVERRIDE; 928 929 ip6->ip6_plen = htons((u_short)icmp6len); 930 nd_na->nd_na_flags_reserved = flags; 931 nd_na->nd_na_cksum = 0; 932 nd_na->nd_na_cksum = 933 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 934 935 #ifdef IPSEC 936 /* Don't lookup socket */ 937 (void)ipsec_setsocket(m, NULL); 938 #endif 939 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL); 940 if (outif) { 941 icmp6_ifstat_inc(outif, ifs6_out_msg); 942 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); 943 } 944 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 945 } 946 947 caddr_t 948 nd6_ifptomac(ifp) 949 struct ifnet *ifp; 950 { 951 switch (ifp->if_type) { 952 case IFT_ARCNET: 953 case IFT_ETHER: 954 case IFT_FDDI: 955 case IFT_IEEE1394: 956 #ifdef IFT_L2VLAN 957 case IFT_L2VLAN: 958 #endif 959 #ifdef IFT_IEEE80211 960 case IFT_IEEE80211: 961 #endif 962 case IFT_ISO88025: 963 return ((caddr_t)(ifp + 1)); 964 default: 965 return NULL; 966 } 967 } 968 969 TAILQ_HEAD(dadq_head, dadq); 970 struct dadq { 971 TAILQ_ENTRY(dadq) dad_list; 972 struct ifaddr *dad_ifa; 973 int dad_count; /* max NS to send */ 974 int dad_ns_tcount; /* # of trials to send NS */ 975 int dad_ns_ocount; /* NS sent so far */ 976 int dad_ns_icount; 977 int dad_na_icount; 978 struct callout dad_timer_ch; 979 }; 980 981 static struct dadq_head dadq; 982 static int dad_init = 0; 983 984 static struct dadq * 985 nd6_dad_find(ifa) 986 struct ifaddr *ifa; 987 { 988 struct dadq *dp; 989 990 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 991 if (dp->dad_ifa == ifa) 992 return dp; 993 } 994 return NULL; 995 } 996 997 static void 998 nd6_dad_starttimer(dp, ticks) 999 struct dadq *dp; 1000 int ticks; 1001 { 1002 1003 callout_reset(&dp->dad_timer_ch, ticks, 1004 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 1005 } 1006 1007 static void 1008 nd6_dad_stoptimer(dp) 1009 struct dadq *dp; 1010 { 1011 1012 callout_stop(&dp->dad_timer_ch); 1013 } 1014 1015 /* 1016 * Start Duplicated Address Detection (DAD) for specified interface address. 1017 */ 1018 void 1019 nd6_dad_start(ifa, tick) 1020 struct ifaddr *ifa; 1021 int *tick; /* minimum delay ticks for IFF_UP event */ 1022 { 1023 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1024 struct dadq *dp; 1025 1026 if (!dad_init) { 1027 TAILQ_INIT(&dadq); 1028 dad_init++; 1029 } 1030 1031 /* 1032 * If we don't need DAD, don't do it. 1033 * There are several cases: 1034 * - DAD is disabled (ip6_dad_count == 0) 1035 * - the interface address is anycast 1036 */ 1037 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1038 log(LOG_DEBUG, 1039 "nd6_dad_start: called with non-tentative address " 1040 "%s(%s)\n", 1041 ip6_sprintf(&ia->ia_addr.sin6_addr), 1042 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1043 return; 1044 } 1045 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1046 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1047 return; 1048 } 1049 if (!ip6_dad_count) { 1050 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1051 return; 1052 } 1053 if (!ifa->ifa_ifp) 1054 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1055 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 1056 return; 1057 } 1058 if (nd6_dad_find(ifa) != NULL) { 1059 /* DAD already in progress */ 1060 return; 1061 } 1062 1063 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1064 if (dp == NULL) { 1065 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1066 "%s(%s)\n", 1067 ip6_sprintf(&ia->ia_addr.sin6_addr), 1068 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1069 return; 1070 } 1071 bzero(dp, sizeof(*dp)); 1072 callout_init(&dp->dad_timer_ch, 0); 1073 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1074 1075 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1076 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1077 1078 /* 1079 * Send NS packet for DAD, ip6_dad_count times. 1080 * Note that we must delay the first transmission, if this is the 1081 * first packet to be sent from the interface after interface 1082 * (re)initialization. 1083 */ 1084 dp->dad_ifa = ifa; 1085 IFAREF(ifa); /* just for safety */ 1086 dp->dad_count = ip6_dad_count; 1087 dp->dad_ns_icount = dp->dad_na_icount = 0; 1088 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1089 if (tick == NULL) { 1090 nd6_dad_ns_output(dp, ifa); 1091 nd6_dad_starttimer(dp, 1092 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1093 } else { 1094 int ntick; 1095 1096 if (*tick == 0) 1097 ntick = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1098 else 1099 ntick = *tick + arc4random() % (hz / 2); 1100 *tick = ntick; 1101 nd6_dad_starttimer(dp, ntick); 1102 } 1103 } 1104 1105 /* 1106 * terminate DAD unconditionally. used for address removals. 1107 */ 1108 void 1109 nd6_dad_stop(ifa) 1110 struct ifaddr *ifa; 1111 { 1112 struct dadq *dp; 1113 1114 if (!dad_init) 1115 return; 1116 dp = nd6_dad_find(ifa); 1117 if (!dp) { 1118 /* DAD wasn't started yet */ 1119 return; 1120 } 1121 1122 nd6_dad_stoptimer(dp); 1123 1124 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1125 free(dp, M_IP6NDP); 1126 dp = NULL; 1127 IFAFREE(ifa); 1128 } 1129 1130 static void 1131 nd6_dad_timer(ifa) 1132 struct ifaddr *ifa; 1133 { 1134 int s; 1135 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1136 struct dadq *dp; 1137 1138 s = splnet(); /* XXX */ 1139 1140 /* Sanity check */ 1141 if (ia == NULL) { 1142 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1143 goto done; 1144 } 1145 dp = nd6_dad_find(ifa); 1146 if (dp == NULL) { 1147 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1148 goto done; 1149 } 1150 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1151 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1152 "%s(%s)\n", 1153 ip6_sprintf(&ia->ia_addr.sin6_addr), 1154 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1155 goto done; 1156 } 1157 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1158 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1159 "%s(%s)\n", 1160 ip6_sprintf(&ia->ia_addr.sin6_addr), 1161 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1162 goto done; 1163 } 1164 1165 /* timeouted with IFF_{RUNNING,UP} check */ 1166 if (dp->dad_ns_tcount > dad_maxtry) { 1167 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1168 if_name(ifa->ifa_ifp))); 1169 1170 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1171 free(dp, M_IP6NDP); 1172 dp = NULL; 1173 IFAFREE(ifa); 1174 goto done; 1175 } 1176 1177 /* Need more checks? */ 1178 if (dp->dad_ns_ocount < dp->dad_count) { 1179 /* 1180 * We have more NS to go. Send NS packet for DAD. 1181 */ 1182 nd6_dad_ns_output(dp, ifa); 1183 nd6_dad_starttimer(dp, 1184 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1185 } else { 1186 /* 1187 * We have transmitted sufficient number of DAD packets. 1188 * See what we've got. 1189 */ 1190 int duplicate; 1191 1192 duplicate = 0; 1193 1194 if (dp->dad_na_icount) { 1195 /* 1196 * the check is in nd6_dad_na_input(), 1197 * but just in case 1198 */ 1199 duplicate++; 1200 } 1201 1202 if (dp->dad_ns_icount) { 1203 #if 0 /* heuristics */ 1204 /* 1205 * if 1206 * - we have sent many(?) DAD NS, and 1207 * - the number of NS we sent equals to the 1208 * number of NS we've got, and 1209 * - we've got no NA 1210 * we may have a faulty network card/driver which 1211 * loops back multicasts to myself. 1212 */ 1213 if (3 < dp->dad_count 1214 && dp->dad_ns_icount == dp->dad_count 1215 && dp->dad_na_icount == 0) { 1216 log(LOG_INFO, "DAD questionable for %s(%s): " 1217 "network card loops back multicast?\n", 1218 ip6_sprintf(&ia->ia_addr.sin6_addr), 1219 if_name(ifa->ifa_ifp)); 1220 /* XXX consider it a duplicate or not? */ 1221 /* duplicate++; */ 1222 } else { 1223 /* We've seen NS, means DAD has failed. */ 1224 duplicate++; 1225 } 1226 #else 1227 /* We've seen NS, means DAD has failed. */ 1228 duplicate++; 1229 #endif 1230 } 1231 1232 if (duplicate) { 1233 /* (*dp) will be freed in nd6_dad_duplicated() */ 1234 dp = NULL; 1235 nd6_dad_duplicated(ifa); 1236 } else { 1237 /* 1238 * We are done with DAD. No NA came, no NS came. 1239 * duplicated address found. 1240 */ 1241 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1242 1243 nd6log((LOG_DEBUG, 1244 "%s: DAD complete for %s - no duplicates found\n", 1245 if_name(ifa->ifa_ifp), 1246 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1247 1248 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1249 free(dp, M_IP6NDP); 1250 dp = NULL; 1251 IFAFREE(ifa); 1252 } 1253 } 1254 1255 done: 1256 splx(s); 1257 } 1258 1259 void 1260 nd6_dad_duplicated(ifa) 1261 struct ifaddr *ifa; 1262 { 1263 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1264 struct dadq *dp; 1265 1266 dp = nd6_dad_find(ifa); 1267 if (dp == NULL) { 1268 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1269 return; 1270 } 1271 1272 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1273 "NS in/out=%d/%d, NA in=%d\n", 1274 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1275 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1276 1277 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1278 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1279 1280 /* We are done with DAD, with duplicated address found. (failure) */ 1281 nd6_dad_stoptimer(dp); 1282 1283 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1284 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1285 log(LOG_ERR, "%s: manual intervention required\n", 1286 if_name(ifa->ifa_ifp)); 1287 1288 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1289 free(dp, M_IP6NDP); 1290 dp = NULL; 1291 IFAFREE(ifa); 1292 } 1293 1294 static void 1295 nd6_dad_ns_output(dp, ifa) 1296 struct dadq *dp; 1297 struct ifaddr *ifa; 1298 { 1299 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1300 struct ifnet *ifp = ifa->ifa_ifp; 1301 1302 dp->dad_ns_tcount++; 1303 if ((ifp->if_flags & IFF_UP) == 0) { 1304 #if 0 1305 printf("%s: interface down?\n", if_name(ifp)); 1306 #endif 1307 return; 1308 } 1309 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1310 #if 0 1311 printf("%s: interface not running?\n", if_name(ifp)); 1312 #endif 1313 return; 1314 } 1315 1316 dp->dad_ns_ocount++; 1317 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1318 } 1319 1320 static void 1321 nd6_dad_ns_input(ifa) 1322 struct ifaddr *ifa; 1323 { 1324 struct in6_ifaddr *ia; 1325 struct ifnet *ifp; 1326 const struct in6_addr *taddr6; 1327 struct dadq *dp; 1328 int duplicate; 1329 1330 if (!ifa) 1331 panic("ifa == NULL in nd6_dad_ns_input"); 1332 1333 ia = (struct in6_ifaddr *)ifa; 1334 ifp = ifa->ifa_ifp; 1335 taddr6 = &ia->ia_addr.sin6_addr; 1336 duplicate = 0; 1337 dp = nd6_dad_find(ifa); 1338 1339 /* Quickhack - completely ignore DAD NS packets */ 1340 if (dad_ignore_ns) { 1341 nd6log((LOG_INFO, 1342 "nd6_dad_ns_input: ignoring DAD NS packet for " 1343 "address %s(%s)\n", ip6_sprintf(taddr6), 1344 if_name(ifa->ifa_ifp))); 1345 return; 1346 } 1347 1348 /* 1349 * if I'm yet to start DAD, someone else started using this address 1350 * first. I have a duplicate and you win. 1351 */ 1352 if (!dp || dp->dad_ns_ocount == 0) 1353 duplicate++; 1354 1355 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1356 1357 if (duplicate) { 1358 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1359 nd6_dad_duplicated(ifa); 1360 } else { 1361 /* 1362 * not sure if I got a duplicate. 1363 * increment ns count and see what happens. 1364 */ 1365 if (dp) 1366 dp->dad_ns_icount++; 1367 } 1368 } 1369 1370 static void 1371 nd6_dad_na_input(ifa) 1372 struct ifaddr *ifa; 1373 { 1374 struct dadq *dp; 1375 1376 if (!ifa) 1377 panic("ifa == NULL in nd6_dad_na_input"); 1378 1379 dp = nd6_dad_find(ifa); 1380 if (dp) 1381 dp->dad_na_icount++; 1382 1383 /* remove the address. */ 1384 nd6_dad_duplicated(ifa); 1385 } 1386