1 /* $NetBSD: nd6_nbr.c,v 1.22 2000/05/19 01:40:19 itojun Exp $ */ 2 /* $KAME: nd6_nbr.c,v 1.36 2000/05/17 12:35:59 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_ipsec.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/time.h> 43 #include <sys/kernel.h> 44 #include <sys/errno.h> 45 #include <sys/ioctl.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 #endif 66 67 #include <net/net_osdep.h> 68 69 #define SDL(s) ((struct sockaddr_dl *)s) 70 71 struct dadq; 72 static struct dadq *nd6_dad_find __P((struct ifaddr *)); 73 static void nd6_dad_timer __P((struct ifaddr *)); 74 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 75 static void nd6_dad_ns_input __P((struct ifaddr *)); 76 static void nd6_dad_na_input __P((struct ifaddr *)); 77 78 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 79 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 80 81 /* 82 * Input an Neighbor Solicitation Message. 83 * 84 * Based on RFC 2461 85 * Based on RFC 2462 (duplicated address detection) 86 */ 87 void 88 nd6_ns_input(m, off, icmp6len) 89 struct mbuf *m; 90 int off, icmp6len; 91 { 92 struct ifnet *ifp = m->m_pkthdr.rcvif; 93 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 94 struct nd_neighbor_solicit *nd_ns; 95 struct in6_addr saddr6 = ip6->ip6_src; 96 struct in6_addr daddr6 = ip6->ip6_dst; 97 struct in6_addr taddr6; 98 struct in6_addr myaddr6; 99 char *lladdr = NULL; 100 struct ifaddr *ifa; 101 int lladdrlen = 0; 102 int anycast = 0, proxy = 0, tentative = 0; 103 int tlladdr; 104 union nd_opts ndopts; 105 struct sockaddr_dl *proxydl = NULL; 106 107 if (ip6->ip6_hlim != 255) { 108 log(LOG_ERR, 109 "nd6_ns_input: invalid hlim %d\n", ip6->ip6_hlim); 110 goto freeit; 111 } 112 113 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 114 /* dst has to be solicited node multicast address. */ 115 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL 116 /*don't check ifindex portion*/ 117 && daddr6.s6_addr32[1] == 0 118 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE 119 && daddr6.s6_addr8[12] == 0xff) { 120 ; /*good*/ 121 } else { 122 log(LOG_INFO, "nd6_ns_input: bad DAD packet " 123 "(wrong ip6 dst)\n"); 124 goto bad; 125 } 126 } 127 128 #ifndef PULLDOWN_TEST 129 IP6_EXTHDR_CHECK(m, off, icmp6len,); 130 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 131 #else 132 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 133 if (nd_ns == NULL) { 134 icmp6stat.icp6s_tooshort++; 135 return; 136 } 137 #endif 138 taddr6 = nd_ns->nd_ns_target; 139 140 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 141 log(LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n"); 142 goto bad; 143 } 144 145 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 146 taddr6.s6_addr16[1] = htons(ifp->if_index); 147 148 icmp6len -= sizeof(*nd_ns); 149 nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 150 if (nd6_options(&ndopts) < 0) { 151 log(LOG_INFO, "nd6_ns_input: invalid ND option, ignored\n"); 152 goto bad; 153 } 154 155 if (ndopts.nd_opts_src_lladdr) { 156 lladdr = (char *)(ndopts.nd_opts_src_lladdr +1); 157 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 158 } 159 160 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 161 log(LOG_INFO, "nd6_ns_input: bad DAD packet " 162 "(link-layer address option)\n"); 163 goto bad; 164 } 165 166 /* 167 * Attaching target link-layer address to the NA? 168 * (RFC 2461 7.2.4) 169 * 170 * NS IP dst is unicast/anycast MUST NOT add 171 * NS IP dst is solicited-node multicast MUST add 172 * 173 * In implementation, we add target link-layer address by default. 174 * We do not add one in MUST NOT cases. 175 */ 176 #if 0 /* too much! */ 177 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); 178 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) 179 tlladdr = 0; 180 else 181 #endif 182 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 183 tlladdr = 0; 184 else 185 tlladdr = 1; 186 187 /* 188 * Target address (taddr6) must be either: 189 * (1) Valid unicast/anycast address for my receiving interface, 190 * (2) Unicast address for which I'm offering proxy service, or 191 * (3) "tentative" address on which DAD is being performed. 192 */ 193 /* (1) and (3) check. */ 194 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 195 196 /* (2) check. */ 197 if (!ifa) { 198 struct rtentry *rt; 199 struct sockaddr_in6 tsin6; 200 201 bzero(&tsin6, sizeof tsin6); 202 tsin6.sin6_len = sizeof(struct sockaddr_in6); 203 tsin6.sin6_family = AF_INET6; 204 tsin6.sin6_addr = taddr6; 205 206 rt = rtalloc1((struct sockaddr *)&tsin6, 0); 207 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 208 rt->rt_gateway->sa_family == AF_LINK) { 209 /* 210 * proxy NDP for single entry 211 */ 212 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 213 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 214 if (ifa) { 215 proxy = 1; 216 proxydl = SDL(rt->rt_gateway); 217 } 218 } 219 if (rt) 220 rtfree(rt); 221 } 222 if (!ifa) { 223 /* 224 * We've got a NS packet, and we don't have that adddress 225 * assigned for us. We MUST silently ignore it. 226 * See RFC2461 7.2.3. 227 */ 228 goto freeit; 229 } 230 myaddr6 = *IFA_IN6(ifa); 231 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 232 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 233 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 234 goto freeit; 235 236 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 237 log(LOG_INFO, 238 "nd6_ns_input: lladdrlen mismatch for %s " 239 "(if %d, NS packet %d)\n", 240 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2); 241 } 242 243 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 244 log(LOG_INFO, 245 "nd6_ns_input: duplicate IP6 address %s\n", 246 ip6_sprintf(&saddr6)); 247 goto freeit; 248 } 249 250 /* 251 * We have neighbor solicitation packet, with target address equals to 252 * one of my tentative address. 253 * 254 * src addr how to process? 255 * --- --- 256 * multicast of course, invalid (rejected in ip6_input) 257 * unicast somebody is doing address resolution -> ignore 258 * unspec dup address detection 259 * 260 * The processing is defined in RFC 2462. 261 */ 262 if (tentative) { 263 /* 264 * If source address is unspecified address, it is for 265 * duplicated address detection. 266 * 267 * If not, the packet is for addess resolution; 268 * silently ignore it. 269 */ 270 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 271 nd6_dad_ns_input(ifa); 272 273 goto freeit; 274 } 275 276 /* 277 * If the source address is unspecified address, entries must not 278 * be created or updated. 279 * It looks that sender is performing DAD. Output NA toward 280 * all-node multicast address, to tell the sender that I'm using 281 * the address. 282 * S bit ("solicited") must be zero. 283 */ 284 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 285 saddr6 = in6addr_linklocal_allnodes; 286 saddr6.s6_addr16[1] = htons(ifp->if_index); 287 nd6_na_output(ifp, &saddr6, &taddr6, 288 ((anycast || proxy || !tlladdr) 289 ? 0 : ND_NA_FLAG_OVERRIDE) 290 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 291 tlladdr, (struct sockaddr *)proxydl); 292 goto freeit; 293 } 294 295 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 296 297 nd6_na_output(ifp, &saddr6, &taddr6, 298 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) 299 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) 300 | ND_NA_FLAG_SOLICITED, 301 tlladdr, (struct sockaddr *)proxydl); 302 freeit: 303 m_freem(m); 304 return; 305 306 bad: 307 log(LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6)); 308 log(LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6)); 309 log(LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6)); 310 m_freem(m); 311 } 312 313 /* 314 * Output an Neighbor Solicitation Message. Caller specifies: 315 * - ICMP6 header source IP6 address 316 * - ND6 header target IP6 address 317 * - ND6 header source datalink address 318 * 319 * Based on RFC 2461 320 * Based on RFC 2462 (duplicated address detection) 321 */ 322 void 323 nd6_ns_output(ifp, daddr6, taddr6, ln, dad) 324 struct ifnet *ifp; 325 struct in6_addr *daddr6, *taddr6; 326 struct llinfo_nd6 *ln; /* for source address determination */ 327 int dad; /* duplicated address detection */ 328 { 329 struct mbuf *m; 330 struct ip6_hdr *ip6; 331 struct nd_neighbor_solicit *nd_ns; 332 struct in6_ifaddr *ia = NULL; 333 struct ip6_moptions im6o; 334 int icmp6len; 335 int maxlen; 336 caddr_t mac; 337 struct ifnet *outif = NULL; 338 339 if (IN6_IS_ADDR_MULTICAST(taddr6)) 340 return; 341 342 /* estimate the size of message */ 343 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 344 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 345 if (max_linkhdr + maxlen >= MCLBYTES) { 346 #ifdef DIAGNOSTIC 347 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 348 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 349 #endif 350 return; 351 } 352 353 MGETHDR(m, M_DONTWAIT, MT_DATA); 354 if (m && max_linkhdr + maxlen >= MHLEN) { 355 MCLGET(m, M_DONTWAIT); 356 if ((m->m_flags & M_EXT) == 0) { 357 m_free(m); 358 m = NULL; 359 } 360 } 361 if (m == NULL) 362 return; 363 364 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 365 m->m_flags |= M_MCAST; 366 im6o.im6o_multicast_ifp = ifp; 367 im6o.im6o_multicast_hlim = 255; 368 im6o.im6o_multicast_loop = 0; 369 } 370 371 icmp6len = sizeof(*nd_ns); 372 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 373 m->m_data += max_linkhdr; /*or MH_ALIGN() equivalent?*/ 374 375 /* fill neighbor solicitation packet */ 376 ip6 = mtod(m, struct ip6_hdr *); 377 ip6->ip6_flow = 0; 378 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 379 ip6->ip6_vfc |= IPV6_VERSION; 380 /* ip6->ip6_plen will be set later */ 381 ip6->ip6_nxt = IPPROTO_ICMPV6; 382 ip6->ip6_hlim = 255; 383 if (daddr6) 384 ip6->ip6_dst = *daddr6; 385 else { 386 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 387 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 388 ip6->ip6_dst.s6_addr32[1] = 0; 389 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 390 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 391 ip6->ip6_dst.s6_addr8[12] = 0xff; 392 } 393 if (!dad) { 394 #if 0 /* KAME way, exact address scope match */ 395 /* 396 * Select a source whose scope is the same as that of the dest. 397 * Typically, the dest is link-local solicitation multicast 398 * (i.e. neighbor discovery) or link-local/global unicast 399 * (i.e. neighbor un-reachability detection). 400 */ 401 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 402 if (ia == NULL) { 403 m_freem(m); 404 return; 405 } 406 ip6->ip6_src = ia->ia_addr.sin6_addr; 407 #else /* spec-wise correct */ 408 /* 409 * RFC2461 7.2.2: 410 * "If the source address of the packet prompting the 411 * solicitation is the same as one of the addresses assigned 412 * to the outgoing interface, that address SHOULD be placed 413 * in the IP Source Address of the outgoing solicitation. 414 * Otherwise, any one of the addresses assigned to the 415 * interface should be used." 416 * 417 * We use the source address for the prompting packet 418 * (saddr6), if: 419 * - saddr6 is given from the caller (by giving "ln"), and 420 * - saddr6 belongs to the outgoing interface. 421 * Otherwise, we perform a scope-wise match. 422 */ 423 struct ip6_hdr *hip6; /*hold ip6*/ 424 struct in6_addr *saddr6; 425 426 if (ln && ln->ln_hold) { 427 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 428 /* XXX pullup? */ 429 if (sizeof(*hip6) < ln->ln_hold->m_len) 430 saddr6 = &hip6->ip6_src; 431 else 432 saddr6 = NULL; 433 } else 434 saddr6 = NULL; 435 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 436 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 437 else { 438 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 439 if (ia == NULL) { 440 m_freem(m); /*XXX*/ 441 return; 442 } 443 ip6->ip6_src = ia->ia_addr.sin6_addr; 444 } 445 #endif 446 } else { 447 /* 448 * Source address for DAD packet must always be IPv6 449 * unspecified address. (0::0) 450 */ 451 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 452 } 453 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 454 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 455 nd_ns->nd_ns_code = 0; 456 nd_ns->nd_ns_reserved = 0; 457 nd_ns->nd_ns_target = *taddr6; 458 459 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target)) 460 nd_ns->nd_ns_target.s6_addr16[1] = 0; 461 462 /* 463 * Add source link-layer address option. 464 * 465 * spec implementation 466 * --- --- 467 * DAD packet MUST NOT do not add the option 468 * there's no link layer address: 469 * impossible do not add the option 470 * there's link layer address: 471 * Multicast NS MUST add one add the option 472 * Unicast NS SHOULD add one add the option 473 */ 474 if (!dad && (mac = nd6_ifptomac(ifp))) { 475 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 476 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 477 /* 8 byte alignments... */ 478 optlen = (optlen + 7) & ~7; 479 480 m->m_pkthdr.len += optlen; 481 m->m_len += optlen; 482 icmp6len += optlen; 483 bzero((caddr_t)nd_opt, optlen); 484 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 485 nd_opt->nd_opt_len = optlen >> 3; 486 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 487 } 488 489 ip6->ip6_plen = htons((u_short)icmp6len); 490 nd_ns->nd_ns_cksum = 0; 491 nd_ns->nd_ns_cksum 492 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 493 494 #ifdef IPSEC 495 /* Don't lookup socket */ 496 ipsec_setsocket(m, NULL); 497 #endif 498 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif); 499 if (outif) { 500 icmp6_ifstat_inc(outif, ifs6_out_msg); 501 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); 502 } 503 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 504 } 505 506 /* 507 * Neighbor advertisement input handling. 508 * 509 * Based on RFC 2461 510 * Based on RFC 2462 (duplicated address detection) 511 * 512 * the following items are not implemented yet: 513 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 514 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 515 */ 516 void 517 nd6_na_input(m, off, icmp6len) 518 struct mbuf *m; 519 int off, icmp6len; 520 { 521 struct ifnet *ifp = m->m_pkthdr.rcvif; 522 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 523 struct nd_neighbor_advert *nd_na; 524 #if 0 525 struct in6_addr saddr6 = ip6->ip6_src; 526 #endif 527 struct in6_addr daddr6 = ip6->ip6_dst; 528 struct in6_addr taddr6; 529 int flags; 530 int is_router; 531 int is_solicited; 532 int is_override; 533 char *lladdr = NULL; 534 int lladdrlen = 0; 535 struct ifaddr *ifa; 536 struct llinfo_nd6 *ln; 537 struct rtentry *rt; 538 struct sockaddr_dl *sdl; 539 union nd_opts ndopts; 540 541 if (ip6->ip6_hlim != 255) { 542 log(LOG_ERR, 543 "nd6_na_input: invalid hlim %d\n", ip6->ip6_hlim); 544 goto freeit; 545 } 546 547 #ifndef PULLDOWN_TEST 548 IP6_EXTHDR_CHECK(m, off, icmp6len,); 549 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 550 #else 551 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 552 if (nd_na == NULL) { 553 icmp6stat.icp6s_tooshort++; 554 return; 555 } 556 #endif 557 taddr6 = nd_na->nd_na_target; 558 flags = nd_na->nd_na_flags_reserved; 559 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 560 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 561 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 562 563 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 564 taddr6.s6_addr16[1] = htons(ifp->if_index); 565 566 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 567 log(LOG_ERR, 568 "nd6_na_input: invalid target address %s\n", 569 ip6_sprintf(&taddr6)); 570 goto freeit; 571 } 572 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 573 if (is_solicited) { 574 log(LOG_ERR, 575 "nd6_na_input: a solicited adv is multicasted\n"); 576 goto freeit; 577 } 578 579 icmp6len -= sizeof(*nd_na); 580 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 581 if (nd6_options(&ndopts) < 0) { 582 log(LOG_INFO, "nd6_na_input: invalid ND option, ignored\n"); 583 goto freeit; 584 } 585 586 if (ndopts.nd_opts_tgt_lladdr) { 587 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 588 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 589 } 590 591 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 592 593 /* 594 * Target address matches one of my interface address. 595 * 596 * If my address is tentative, this means that there's somebody 597 * already using the same address as mine. This indicates DAD failure. 598 * This is defined in RFC 2462. 599 * 600 * Otherwise, process as defined in RFC 2461. 601 */ 602 if (ifa 603 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 604 nd6_dad_na_input(ifa); 605 goto freeit; 606 } 607 608 /* Just for safety, maybe unnecessery. */ 609 if (ifa) { 610 log(LOG_ERR, 611 "nd6_na_input: duplicate IP6 address %s\n", 612 ip6_sprintf(&taddr6)); 613 goto freeit; 614 } 615 616 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 617 log(LOG_INFO, 618 "nd6_na_input: lladdrlen mismatch for %s " 619 "(if %d, NA packet %d)\n", 620 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2); 621 } 622 623 /* 624 * If no neighbor cache entry is found, NA SHOULD silently be discarded. 625 */ 626 rt = nd6_lookup(&taddr6, 0, ifp); 627 if ((rt == NULL) || 628 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 629 ((sdl = SDL(rt->rt_gateway)) == NULL)) 630 goto freeit; 631 632 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 633 /* 634 * If the link-layer has address, and no lladdr option came, 635 * discard the packet. 636 */ 637 if (ifp->if_addrlen && !lladdr) 638 goto freeit; 639 640 /* 641 * Record link-layer address, and update the state. 642 */ 643 sdl->sdl_alen = ifp->if_addrlen; 644 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 645 if (is_solicited) { 646 ln->ln_state = ND6_LLINFO_REACHABLE; 647 if (ln->ln_expire) 648 ln->ln_expire = time.tv_sec + 649 nd_ifinfo[rt->rt_ifp->if_index].reachable; 650 } else 651 ln->ln_state = ND6_LLINFO_STALE; 652 ln->ln_router = is_router; 653 } else { 654 int llchange; 655 656 /* 657 * Check if the link-layer address has changed or not. 658 */ 659 if (!lladdr) 660 llchange = 0; 661 else { 662 if (sdl->sdl_alen) { 663 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 664 llchange = 1; 665 else 666 llchange = 0; 667 } else 668 llchange = 1; 669 } 670 671 /* 672 * This is VERY complex. Look at it with care. 673 * 674 * override solicit lladdr llchange action 675 * (L: record lladdr) 676 * 677 * 0 0 n -- (2c) 678 * 0 0 y n (2b) L 679 * 0 0 y y (1) REACHABLE->STALE 680 * 0 1 n -- (2c) *->REACHABLE 681 * 0 1 y n (2b) L *->REACHABLE 682 * 0 1 y y (1) REACHABLE->STALE 683 * 1 0 n -- (2a) 684 * 1 0 y n (2a) L 685 * 1 0 y y (2a) L *->STALE 686 * 1 1 n -- (2a) *->REACHABLE 687 * 1 1 y n (2a) L *->REACHABLE 688 * 1 1 y y (2a) L *->REACHABLE 689 */ 690 if (!is_override && (lladdr && llchange)) { /* (1) */ 691 /* 692 * If state is REACHABLE, make it STALE. 693 * no other updates should be done. 694 */ 695 if (ln->ln_state == ND6_LLINFO_REACHABLE) 696 ln->ln_state = ND6_LLINFO_STALE; 697 goto freeit; 698 } else if (is_override /* (2a) */ 699 || (!is_override && (lladdr && !llchange)) /* (2b) */ 700 || !lladdr) { /* (2c) */ 701 /* 702 * Update link-local address, if any. 703 */ 704 if (lladdr) { 705 sdl->sdl_alen = ifp->if_addrlen; 706 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 707 } 708 709 /* 710 * If solicited, make the state REACHABLE. 711 * If not solicited and the link-layer address was 712 * changed, make it STALE. 713 */ 714 if (is_solicited) { 715 ln->ln_state = ND6_LLINFO_REACHABLE; 716 if (ln->ln_expire) { 717 ln->ln_expire = time.tv_sec + 718 nd_ifinfo[ifp->if_index].reachable; 719 } 720 } else { 721 if (lladdr && llchange) 722 ln->ln_state = ND6_LLINFO_STALE; 723 } 724 } 725 726 if (ln->ln_router && !is_router) { 727 /* 728 * The peer dropped the router flag. 729 * Remove the sender from the Default Router List and 730 * update the Destination Cache entries. 731 */ 732 struct nd_defrouter *dr; 733 struct in6_addr *in6; 734 int s; 735 736 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 737 s = splsoftnet(); 738 dr = defrouter_lookup(in6, rt->rt_ifp); 739 if (dr) 740 defrtrlist_del(dr); 741 else if (!ip6_forwarding && ip6_accept_rtadv) { 742 /* 743 * Even if the neighbor is not in the default 744 * router list, the neighbor may be used 745 * as a next hop for some destinations 746 * (e.g. redirect case). So we must 747 * call rt6_flush explicitly. 748 */ 749 rt6_flush(&ip6->ip6_src, rt->rt_ifp); 750 } 751 splx(s); 752 } 753 ln->ln_router = is_router; 754 } 755 rt->rt_flags &= ~RTF_REJECT; 756 ln->ln_asked = 0; 757 if (ln->ln_hold) { 758 #ifdef OLDIP6OUTPUT 759 (*ifp->if_output)(ifp, ln->ln_hold, rt_key(rt), rt); 760 #else 761 /* 762 * we assume ifp is not a p2p here, so just set the 2nd 763 * argument as the 1st one. 764 */ 765 nd6_output(ifp, ifp, ln->ln_hold, 766 (struct sockaddr_in6 *)rt_key(rt), rt); 767 #endif 768 ln->ln_hold = 0; 769 } 770 771 freeit: 772 m_freem(m); 773 } 774 775 /* 776 * Neighbor advertisement output handling. 777 * 778 * Based on RFC 2461 779 * 780 * the following items are not implemented yet: 781 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 782 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 783 */ 784 void 785 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 786 struct ifnet *ifp; 787 struct in6_addr *daddr6, *taddr6; 788 u_long flags; 789 int tlladdr; /* 1 if include target link-layer address */ 790 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 791 { 792 struct mbuf *m; 793 struct ip6_hdr *ip6; 794 struct nd_neighbor_advert *nd_na; 795 struct in6_ifaddr *ia = NULL; 796 struct ip6_moptions im6o; 797 int icmp6len; 798 int maxlen; 799 caddr_t mac; 800 struct ifnet *outif = NULL; 801 802 /* estimate the size of message */ 803 maxlen = sizeof(*ip6) + sizeof(*nd_na); 804 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 805 if (max_linkhdr + maxlen >= MCLBYTES) { 806 #ifdef DIAGNOSTIC 807 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 808 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 809 #endif 810 return; 811 } 812 813 MGETHDR(m, M_DONTWAIT, MT_DATA); 814 if (m && max_linkhdr + maxlen >= MHLEN) { 815 MCLGET(m, M_DONTWAIT); 816 if ((m->m_flags & M_EXT) == 0) { 817 m_free(m); 818 m = NULL; 819 } 820 } 821 if (m == NULL) 822 return; 823 824 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 825 m->m_flags |= M_MCAST; 826 im6o.im6o_multicast_ifp = ifp; 827 im6o.im6o_multicast_hlim = 255; 828 im6o.im6o_multicast_loop = 0; 829 } 830 831 icmp6len = sizeof(*nd_na); 832 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 833 m->m_data += max_linkhdr; /*or MH_ALIGN() equivalent?*/ 834 835 /* fill neighbor advertisement packet */ 836 ip6 = mtod(m, struct ip6_hdr *); 837 ip6->ip6_flow = 0; 838 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 839 ip6->ip6_vfc |= IPV6_VERSION; 840 ip6->ip6_nxt = IPPROTO_ICMPV6; 841 ip6->ip6_hlim = 255; 842 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 843 /* reply to DAD */ 844 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 845 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 846 ip6->ip6_dst.s6_addr32[1] = 0; 847 ip6->ip6_dst.s6_addr32[2] = 0; 848 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 849 flags &= ~ND_NA_FLAG_SOLICITED; 850 } else 851 ip6->ip6_dst = *daddr6; 852 853 /* 854 * Select a source whose scope is the same as that of the dest. 855 */ 856 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 857 if (ia == NULL) { 858 m_freem(m); 859 return; 860 } 861 ip6->ip6_src = ia->ia_addr.sin6_addr; 862 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 863 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 864 nd_na->nd_na_code = 0; 865 nd_na->nd_na_target = *taddr6; 866 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target)) 867 nd_na->nd_na_target.s6_addr16[1] = 0; 868 869 /* 870 * "tlladdr" indicates NS's condition for adding tlladdr or not. 871 * see nd6_ns_input() for details. 872 * Basically, if NS packet is sent to unicast/anycast addr, 873 * target lladdr option SHOULD NOT be included. 874 */ 875 if (tlladdr) { 876 mac = NULL; 877 /* 878 * sdl0 != NULL indicates proxy NA. If we do proxy, use 879 * lladdr in sdl0. If we are not proxying (sending NA for 880 * my address) use lladdr configured for the interface. 881 */ 882 if (sdl0 == NULL) 883 mac = nd6_ifptomac(ifp); 884 else if (sdl0->sa_family == AF_LINK) { 885 struct sockaddr_dl *sdl; 886 sdl = (struct sockaddr_dl *)sdl0; 887 if (sdl->sdl_alen == ifp->if_addrlen) 888 mac = LLADDR(sdl); 889 } 890 } 891 if (tlladdr && mac) { 892 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 893 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 894 895 /* roundup to 8 bytes alignment! */ 896 optlen = (optlen + 7) & ~7; 897 898 m->m_pkthdr.len += optlen; 899 m->m_len += optlen; 900 icmp6len += optlen; 901 bzero((caddr_t)nd_opt, optlen); 902 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 903 nd_opt->nd_opt_len = optlen >> 3; 904 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 905 } else 906 flags &= ~ND_NA_FLAG_OVERRIDE; 907 908 ip6->ip6_plen = htons((u_short)icmp6len); 909 nd_na->nd_na_flags_reserved = flags; 910 nd_na->nd_na_cksum = 0; 911 nd_na->nd_na_cksum = 912 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 913 914 #ifdef IPSEC 915 /* Don't lookup socket */ 916 ipsec_setsocket(m, NULL); 917 #endif 918 ip6_output(m, NULL, NULL, 0, &im6o, &outif); 919 if (outif) { 920 icmp6_ifstat_inc(outif, ifs6_out_msg); 921 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); 922 } 923 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 924 } 925 926 caddr_t 927 nd6_ifptomac(ifp) 928 struct ifnet *ifp; 929 { 930 switch (ifp->if_type) { 931 case IFT_ARCNET: 932 case IFT_ETHER: 933 case IFT_FDDI: 934 return LLADDR(ifp->if_sadl); 935 break; 936 default: 937 return NULL; 938 } 939 } 940 941 TAILQ_HEAD(dadq_head, dadq); 942 struct dadq { 943 TAILQ_ENTRY(dadq) dad_list; 944 struct ifaddr *dad_ifa; 945 int dad_count; /* max NS to send */ 946 int dad_ns_tcount; /* # of trials to send NS */ 947 int dad_ns_ocount; /* NS sent so far */ 948 int dad_ns_icount; 949 int dad_na_icount; 950 struct callout dad_timer_ch; 951 }; 952 953 static struct dadq_head dadq; 954 955 static struct dadq * 956 nd6_dad_find(ifa) 957 struct ifaddr *ifa; 958 { 959 struct dadq *dp; 960 961 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 962 if (dp->dad_ifa == ifa) 963 return dp; 964 } 965 return NULL; 966 } 967 968 /* 969 * Start Duplicated Address Detection (DAD) for specified interface address. 970 */ 971 void 972 nd6_dad_start(ifa, tick) 973 struct ifaddr *ifa; 974 int *tick; /* minimum delay ticks for IFF_UP event */ 975 { 976 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 977 struct dadq *dp; 978 static int dad_init = 0; 979 980 if (!dad_init) { 981 TAILQ_INIT(&dadq); 982 dad_init++; 983 } 984 985 /* 986 * If we don't need DAD, don't do it. 987 * There are several cases: 988 * - DAD is disabled (ip6_dad_count == 0) 989 * - the interface address is anycast 990 */ 991 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 992 log(LOG_DEBUG, 993 "nd6_dad_start: called with non-tentative address " 994 "%s(%s)\n", 995 ip6_sprintf(&ia->ia_addr.sin6_addr), 996 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 997 return; 998 } 999 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1000 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1001 return; 1002 } 1003 if (!ip6_dad_count) { 1004 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1005 return; 1006 } 1007 if (!ifa->ifa_ifp) 1008 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1009 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1010 return; 1011 if (nd6_dad_find(ifa) != NULL) { 1012 /* DAD already in progress */ 1013 return; 1014 } 1015 1016 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1017 if (dp == NULL) { 1018 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1019 "%s(%s)\n", 1020 ip6_sprintf(&ia->ia_addr.sin6_addr), 1021 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1022 return; 1023 } 1024 bzero(dp, sizeof(*dp)); 1025 callout_init(&dp->dad_timer_ch); 1026 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1027 1028 #ifdef ND6_DEBUG 1029 log(LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1030 ip6_sprintf(&ia->ia_addr.sin6_addr)); 1031 #endif 1032 1033 /* 1034 * Send NS packet for DAD, ip6_dad_count times. 1035 * Note that we must delay the first transmission, if this is the 1036 * first packet to be sent from the interface after interface 1037 * (re)initialization. 1038 */ 1039 dp->dad_ifa = ifa; 1040 IFAREF(ifa); /* just for safety */ 1041 dp->dad_count = ip6_dad_count; 1042 dp->dad_ns_icount = dp->dad_na_icount = 0; 1043 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1044 if (!tick) { 1045 nd6_dad_ns_output(dp, ifa); 1046 callout_reset(&dp->dad_timer_ch, 1047 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000, 1048 (void (*) __P((void *)))nd6_dad_timer, ifa); 1049 } else { 1050 int ntick; 1051 1052 if (*tick == 0) 1053 ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1054 else 1055 ntick = *tick + random() % (hz / 2); 1056 *tick = ntick; 1057 callout_reset(&dp->dad_timer_ch, ntick, 1058 (void (*) __P((void *)))nd6_dad_timer, ifa); 1059 } 1060 } 1061 1062 static void 1063 nd6_dad_timer(ifa) 1064 struct ifaddr *ifa; 1065 { 1066 int s; 1067 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1068 struct dadq *dp; 1069 1070 s = splsoftnet(); /*XXX*/ 1071 1072 /* Sanity check */ 1073 if (ia == NULL) { 1074 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1075 goto done; 1076 } 1077 dp = nd6_dad_find(ifa); 1078 if (dp == NULL) { 1079 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1080 goto done; 1081 } 1082 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1083 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1084 "%s(%s)\n", 1085 ip6_sprintf(&ia->ia_addr.sin6_addr), 1086 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1087 goto done; 1088 } 1089 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1090 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1091 "%s(%s)\n", 1092 ip6_sprintf(&ia->ia_addr.sin6_addr), 1093 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1094 goto done; 1095 } 1096 1097 /* timeouted with IFF_{RUNNING,UP} check */ 1098 if (dp->dad_ns_tcount > dad_maxtry) { 1099 log(LOG_ERR, "%s: could not run DAD, driver problem?\n", 1100 if_name(ifa->ifa_ifp)); 1101 1102 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1103 free(dp, M_IP6NDP); 1104 dp = NULL; 1105 IFAFREE(ifa); 1106 goto done; 1107 } 1108 1109 /* Need more checks? */ 1110 if (dp->dad_ns_ocount < dp->dad_count) { 1111 /* 1112 * We have more NS to go. Send NS packet for DAD. 1113 */ 1114 nd6_dad_ns_output(dp, ifa); 1115 callout_reset(&dp->dad_timer_ch, 1116 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000, 1117 (void (*) __P((void *)))nd6_dad_timer, ifa); 1118 } else { 1119 /* 1120 * We have transmitted sufficient number of DAD packets. 1121 * See what we've got. 1122 */ 1123 int duplicate; 1124 1125 duplicate = 0; 1126 1127 if (dp->dad_na_icount) { 1128 /* 1129 * the check is in nd6_dad_na_input(), 1130 * but just in case 1131 */ 1132 duplicate++; 1133 } 1134 1135 if (dp->dad_ns_icount) { 1136 #if 0 /*heuristics*/ 1137 /* 1138 * if 1139 * - we have sent many(?) DAD NS, and 1140 * - the number of NS we sent equals to the 1141 * number of NS we've got, and 1142 * - we've got no NA 1143 * we may have a faulty network card/driver which 1144 * loops back multicasts to myself. 1145 */ 1146 if (3 < dp->dad_count 1147 && dp->dad_ns_icount == dp->dad_count 1148 && dp->dad_na_icount == 0) { 1149 log(LOG_INFO, "DAD questionable for %s(%s): " 1150 "network card loops back multicast?\n", 1151 ip6_sprintf(&ia->ia_addr.sin6_addr), 1152 if_name(ifa->ifa_ifp)); 1153 /* XXX consider it a duplicate or not? */ 1154 /* duplicate++; */ 1155 } else { 1156 /* We've seen NS, means DAD has failed. */ 1157 duplicate++; 1158 } 1159 #else 1160 /* We've seen NS, means DAD has failed. */ 1161 duplicate++; 1162 #endif 1163 } 1164 1165 if (duplicate) { 1166 /* (*dp) will be freed in nd6_dad_duplicated() */ 1167 dp = NULL; 1168 nd6_dad_duplicated(ifa); 1169 } else { 1170 /* 1171 * We are done with DAD. No NA came, no NS came. 1172 * duplicated address found. 1173 */ 1174 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1175 1176 #ifdef ND6_DEBUG 1177 log(LOG_DEBUG, 1178 "%s: DAD complete for %s - no duplicates found\n", 1179 if_name(ifa->ifa_ifp), 1180 ip6_sprintf(&ia->ia_addr.sin6_addr)); 1181 #endif 1182 1183 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1184 free(dp, M_IP6NDP); 1185 dp = NULL; 1186 IFAFREE(ifa); 1187 } 1188 } 1189 1190 done: 1191 splx(s); 1192 } 1193 1194 void 1195 nd6_dad_duplicated(ifa) 1196 struct ifaddr *ifa; 1197 { 1198 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1199 struct dadq *dp; 1200 1201 dp = nd6_dad_find(ifa); 1202 if (dp == NULL) { 1203 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1204 return; 1205 } 1206 1207 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: %d NS, " 1208 "%d NA\n", if_name(ifa->ifa_ifp), 1209 ip6_sprintf(&ia->ia_addr.sin6_addr), 1210 dp->dad_ns_icount, dp->dad_na_icount); 1211 1212 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1213 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1214 1215 /* We are done with DAD, with duplicated address found. (failure) */ 1216 callout_stop(&dp->dad_timer_ch); 1217 1218 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1219 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1220 log(LOG_ERR, "%s: manual intervention required\n", 1221 if_name(ifa->ifa_ifp)); 1222 1223 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1224 free(dp, M_IP6NDP); 1225 dp = NULL; 1226 IFAFREE(ifa); 1227 } 1228 1229 static void 1230 nd6_dad_ns_output(dp, ifa) 1231 struct dadq *dp; 1232 struct ifaddr *ifa; 1233 { 1234 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1235 struct ifnet *ifp = ifa->ifa_ifp; 1236 1237 dp->dad_ns_tcount++; 1238 if ((ifp->if_flags & IFF_UP) == 0) { 1239 #if 0 1240 printf("%s: interface down?\n", if_name(ifp)); 1241 #endif 1242 return; 1243 } 1244 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1245 #if 0 1246 printf("%s: interface not running?\n", if_name(ifp)); 1247 #endif 1248 return; 1249 } 1250 1251 dp->dad_ns_ocount++; 1252 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1253 } 1254 1255 static void 1256 nd6_dad_ns_input(ifa) 1257 struct ifaddr *ifa; 1258 { 1259 struct in6_ifaddr *ia; 1260 struct ifnet *ifp; 1261 struct in6_addr *taddr6; 1262 struct dadq *dp; 1263 int duplicate; 1264 1265 if (!ifa) 1266 panic("ifa == NULL in nd6_dad_ns_input"); 1267 1268 ia = (struct in6_ifaddr *)ifa; 1269 ifp = ifa->ifa_ifp; 1270 taddr6 = &ia->ia_addr.sin6_addr; 1271 duplicate = 0; 1272 dp = nd6_dad_find(ifa); 1273 1274 /* 1275 * If it is from myself, ignore this. 1276 */ 1277 if (ifp && (ifp->if_flags & IFF_LOOPBACK)) 1278 return; 1279 1280 /* Quickhack - completely ignore DAD NS packets */ 1281 if (dad_ignore_ns) { 1282 log(LOG_INFO, "nd6_dad_ns_input: ignoring DAD NS packet for " 1283 "address %s(%s)\n", ip6_sprintf(taddr6), 1284 if_name(ifa->ifa_ifp)); 1285 return; 1286 } 1287 1288 /* 1289 * if I'm yet to start DAD, someone else started using this address 1290 * first. I have a duplicate and you win. 1291 */ 1292 if (!dp || dp->dad_ns_ocount == 0) 1293 duplicate++; 1294 1295 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1296 1297 if (duplicate) { 1298 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1299 nd6_dad_duplicated(ifa); 1300 } else { 1301 /* 1302 * not sure if I got a duplicate. 1303 * increment ns count and see what happens. 1304 */ 1305 if (dp) 1306 dp->dad_ns_icount++; 1307 } 1308 } 1309 1310 static void 1311 nd6_dad_na_input(ifa) 1312 struct ifaddr *ifa; 1313 { 1314 struct dadq *dp; 1315 1316 if (!ifa) 1317 panic("ifa == NULL in nd6_dad_na_input"); 1318 1319 dp = nd6_dad_find(ifa); 1320 if (dp) 1321 dp->dad_na_icount++; 1322 1323 /* remove the address. */ 1324 nd6_dad_duplicated(ifa); 1325 } 1326