1 /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.6 2003/01/23 21:06:47 sam Exp $ */ 2 /* $DragonFly: src/sys/netinet6/nd6_nbr.c,v 1.6 2004/08/02 13:22:33 joerg Exp $ */ 3 /* $KAME: nd6_nbr.c,v 1.86 2002/01/21 02:33:04 jinmei Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 #include "opt_ipsec.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/socket.h> 43 #include <sys/sockio.h> 44 #include <sys/time.h> 45 #include <sys/kernel.h> 46 #include <sys/errno.h> 47 #include <sys/syslog.h> 48 #include <sys/queue.h> 49 #include <sys/callout.h> 50 51 #include <net/if.h> 52 #include <net/if_types.h> 53 #include <net/if_dl.h> 54 #include <net/route.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_var.h> 58 #include <netinet6/in6_var.h> 59 #include <netinet/ip6.h> 60 #include <netinet6/ip6_var.h> 61 #include <netinet6/nd6.h> 62 #include <netinet/icmp6.h> 63 64 #ifdef IPSEC 65 #include <netinet6/ipsec.h> 66 #ifdef INET6 67 #include <netinet6/ipsec6.h> 68 #endif 69 #endif 70 71 #include <net/net_osdep.h> 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 an Neighbor Solicitation Message. 89 * 90 * Based on RFC 2461 91 * Based on RFC 2462 (duplicated 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; 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; 110 111 #ifndef PULLDOWN_TEST 112 IP6_EXTHDR_CHECK(m, off, icmp6len,); 113 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 114 #else 115 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 116 if (nd_ns == NULL) { 117 icmp6stat.icp6s_tooshort++; 118 return; 119 } 120 #endif 121 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 122 taddr6 = nd_ns->nd_ns_target; 123 124 if (ip6->ip6_hlim != 255) { 125 nd6log((LOG_ERR, 126 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 127 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 128 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 129 goto bad; 130 } 131 132 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 133 /* dst has to be solicited node multicast address. */ 134 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL 135 /* don't check ifindex portion */ 136 && daddr6.s6_addr32[1] == 0 137 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE 138 && daddr6.s6_addr8[12] == 0xff) { 139 ; /* good */ 140 } else { 141 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 142 "(wrong ip6 dst)\n")); 143 goto bad; 144 } 145 } 146 147 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 148 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 149 goto bad; 150 } 151 152 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 153 taddr6.s6_addr16[1] = htons(ifp->if_index); 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 0 /* too much! */ 186 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); 187 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) 188 tlladdr = 0; 189 else 190 #endif 191 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 192 tlladdr = 0; 193 else 194 tlladdr = 1; 195 196 /* 197 * Target address (taddr6) must be either: 198 * (1) Valid unicast/anycast address for my receiving interface, 199 * (2) Unicast address for which I'm offering proxy service, or 200 * (3) "tentative" address on which DAD is being performed. 201 */ 202 /* (1) and (3) check. */ 203 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 204 205 /* (2) check. */ 206 if (!ifa) { 207 struct rtentry *rt; 208 struct sockaddr_in6 tsin6; 209 210 bzero(&tsin6, sizeof tsin6); 211 tsin6.sin6_len = sizeof(struct sockaddr_in6); 212 tsin6.sin6_family = AF_INET6; 213 tsin6.sin6_addr = taddr6; 214 215 rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 216 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 217 rt->rt_gateway->sa_family == AF_LINK) { 218 /* 219 * proxy NDP for single entry 220 */ 221 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 222 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 223 if (ifa) { 224 proxy = 1; 225 proxydl = SDL(rt->rt_gateway); 226 } 227 } 228 if (rt) 229 rtfree(rt); 230 } 231 if (!ifa) { 232 /* 233 * We've got an NS packet, and we don't have that adddress 234 * assigned for us. We MUST silently ignore it. 235 * See RFC2461 7.2.3. 236 */ 237 goto freeit; 238 } 239 myaddr6 = *IFA_IN6(ifa); 240 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 241 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 242 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 243 goto freeit; 244 245 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 246 nd6log((LOG_INFO, 247 "nd6_ns_input: lladdrlen mismatch for %s " 248 "(if %d, NS packet %d)\n", 249 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 250 goto bad; 251 } 252 253 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 254 nd6log((LOG_INFO, 255 "nd6_ns_input: duplicate IP6 address %s\n", 256 ip6_sprintf(&saddr6))); 257 goto freeit; 258 } 259 260 /* 261 * We have neighbor solicitation packet, with target address equals to 262 * one of my tentative address. 263 * 264 * src addr how to process? 265 * --- --- 266 * multicast of course, invalid (rejected in ip6_input) 267 * unicast somebody is doing address resolution -> ignore 268 * unspec dup address detection 269 * 270 * The processing is defined in RFC 2462. 271 */ 272 if (tentative) { 273 /* 274 * If source address is unspecified address, it is for 275 * duplicated address detection. 276 * 277 * If not, the packet is for addess resolution; 278 * silently ignore it. 279 */ 280 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 281 nd6_dad_ns_input(ifa); 282 283 goto freeit; 284 } 285 286 /* 287 * If the source address is unspecified address, entries must not 288 * be created or updated. 289 * It looks that sender is performing DAD. Output NA toward 290 * all-node multicast address, to tell the sender that I'm using 291 * the address. 292 * S bit ("solicited") must be zero. 293 */ 294 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 295 saddr6 = in6addr_linklocal_allnodes; 296 saddr6.s6_addr16[1] = htons(ifp->if_index); 297 nd6_na_output(ifp, &saddr6, &taddr6, 298 ((anycast || proxy || !tlladdr) 299 ? 0 : ND_NA_FLAG_OVERRIDE) 300 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 301 tlladdr, (struct sockaddr *)proxydl); 302 goto freeit; 303 } 304 305 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 306 307 nd6_na_output(ifp, &saddr6, &taddr6, 308 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) 309 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) 310 | ND_NA_FLAG_SOLICITED, 311 tlladdr, (struct sockaddr *)proxydl); 312 freeit: 313 m_freem(m); 314 return; 315 316 bad: 317 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 318 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 319 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 320 icmp6stat.icp6s_badns++; 321 m_freem(m); 322 } 323 324 /* 325 * Output an Neighbor Solicitation Message. Caller specifies: 326 * - ICMP6 header source IP6 address 327 * - ND6 header target IP6 address 328 * - ND6 header source datalink address 329 * 330 * Based on RFC 2461 331 * Based on RFC 2462 (duplicated address detection) 332 */ 333 void 334 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 335 const struct in6_addr *taddr6, 336 struct llinfo_nd6 *ln, /* for source address determination */ 337 int dad) /* duplicated address detection */ 338 { 339 struct mbuf *m; 340 struct ip6_hdr *ip6; 341 struct nd_neighbor_solicit *nd_ns; 342 struct in6_ifaddr *ia = NULL; 343 struct ip6_moptions im6o; 344 int icmp6len; 345 int maxlen; 346 caddr_t mac; 347 struct ifnet *outif = NULL; 348 349 if (IN6_IS_ADDR_MULTICAST(taddr6)) 350 return; 351 352 /* estimate the size of message */ 353 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 354 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 355 if (max_linkhdr + maxlen >= MCLBYTES) { 356 #ifdef DIAGNOSTIC 357 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 358 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 359 #endif 360 return; 361 } 362 363 MGETHDR(m, MB_DONTWAIT, MT_DATA); 364 if (m && max_linkhdr + maxlen >= MHLEN) { 365 MCLGET(m, MB_DONTWAIT); 366 if ((m->m_flags & M_EXT) == 0) { 367 m_free(m); 368 m = NULL; 369 } 370 } 371 if (m == NULL) 372 return; 373 m->m_pkthdr.rcvif = NULL; 374 375 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 376 m->m_flags |= M_MCAST; 377 im6o.im6o_multicast_ifp = ifp; 378 im6o.im6o_multicast_hlim = 255; 379 im6o.im6o_multicast_loop = 0; 380 } 381 382 icmp6len = sizeof(*nd_ns); 383 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 384 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 385 386 /* fill neighbor solicitation packet */ 387 ip6 = mtod(m, struct ip6_hdr *); 388 ip6->ip6_flow = 0; 389 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 390 ip6->ip6_vfc |= IPV6_VERSION; 391 /* ip6->ip6_plen will be set later */ 392 ip6->ip6_nxt = IPPROTO_ICMPV6; 393 ip6->ip6_hlim = 255; 394 if (daddr6) 395 ip6->ip6_dst = *daddr6; 396 else { 397 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 398 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 399 ip6->ip6_dst.s6_addr32[1] = 0; 400 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 401 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 402 ip6->ip6_dst.s6_addr8[12] = 0xff; 403 } 404 if (!dad) { 405 #if 0 /* KAME way, exact address scope match */ 406 /* 407 * Select a source whose scope is the same as that of the dest. 408 * Typically, the dest is link-local solicitation multicast 409 * (i.e. neighbor discovery) or link-local/global unicast 410 * (i.e. neighbor un-reachability detection). 411 */ 412 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 413 if (ia == NULL) { 414 m_freem(m); 415 return; 416 } 417 ip6->ip6_src = ia->ia_addr.sin6_addr; 418 #else /* spec-wise correct */ 419 /* 420 * RFC2461 7.2.2: 421 * "If the source address of the packet prompting the 422 * solicitation is the same as one of the addresses assigned 423 * to the outgoing interface, that address SHOULD be placed 424 * in the IP Source Address of the outgoing solicitation. 425 * Otherwise, any one of the addresses assigned to the 426 * interface should be used." 427 * 428 * We use the source address for the prompting packet 429 * (saddr6), if: 430 * - saddr6 is given from the caller (by giving "ln"), and 431 * - saddr6 belongs to the outgoing interface. 432 * Otherwise, we perform a scope-wise match. 433 */ 434 struct ip6_hdr *hip6; /* hold ip6 */ 435 struct in6_addr *saddr6; 436 437 if (ln && ln->ln_hold) { 438 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 439 /* XXX pullup? */ 440 if (sizeof(*hip6) < ln->ln_hold->m_len) 441 saddr6 = &hip6->ip6_src; 442 else 443 saddr6 = NULL; 444 } else 445 saddr6 = NULL; 446 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 447 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 448 else { 449 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 450 if (ia == NULL) { 451 m_freem(m); 452 return; 453 } 454 ip6->ip6_src = ia->ia_addr.sin6_addr; 455 } 456 #endif 457 } else { 458 /* 459 * Source address for DAD packet must always be IPv6 460 * unspecified address. (0::0) 461 */ 462 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 463 } 464 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 465 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 466 nd_ns->nd_ns_code = 0; 467 nd_ns->nd_ns_reserved = 0; 468 nd_ns->nd_ns_target = *taddr6; 469 470 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target)) 471 nd_ns->nd_ns_target.s6_addr16[1] = 0; 472 473 /* 474 * Add source link-layer address option. 475 * 476 * spec implementation 477 * --- --- 478 * DAD packet MUST NOT do not add the option 479 * there's no link layer address: 480 * impossible do not add the option 481 * there's link layer address: 482 * Multicast NS MUST add one add the option 483 * Unicast NS SHOULD add one add the option 484 */ 485 if (!dad && (mac = nd6_ifptomac(ifp))) { 486 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 487 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 488 /* 8 byte alignments... */ 489 optlen = (optlen + 7) & ~7; 490 491 m->m_pkthdr.len += optlen; 492 m->m_len += optlen; 493 icmp6len += optlen; 494 bzero((caddr_t)nd_opt, optlen); 495 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 496 nd_opt->nd_opt_len = optlen >> 3; 497 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 498 } 499 500 ip6->ip6_plen = htons((u_short)icmp6len); 501 nd_ns->nd_ns_cksum = 0; 502 nd_ns->nd_ns_cksum 503 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 504 505 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL); 506 if (outif) { 507 icmp6_ifstat_inc(outif, ifs6_out_msg); 508 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); 509 } 510 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 511 } 512 513 /* 514 * Neighbor advertisement input handling. 515 * 516 * Based on RFC 2461 517 * Based on RFC 2462 (duplicated address detection) 518 * 519 * the following items are not implemented yet: 520 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 521 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 522 */ 523 void 524 nd6_na_input(struct mbuf *m, int off, int icmp6len) 525 { 526 struct ifnet *ifp = m->m_pkthdr.rcvif; 527 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 528 struct nd_neighbor_advert *nd_na; 529 #if 0 530 struct in6_addr saddr6 = ip6->ip6_src; 531 #endif 532 struct in6_addr daddr6 = ip6->ip6_dst; 533 struct in6_addr taddr6; 534 int flags; 535 int is_router; 536 int is_solicited; 537 int is_override; 538 char *lladdr = NULL; 539 int lladdrlen = 0; 540 struct ifaddr *ifa; 541 struct llinfo_nd6 *ln; 542 struct rtentry *rt; 543 struct sockaddr_dl *sdl; 544 union nd_opts ndopts; 545 546 if (ip6->ip6_hlim != 255) { 547 nd6log((LOG_ERR, 548 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 549 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 550 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 551 goto bad; 552 } 553 554 #ifndef PULLDOWN_TEST 555 IP6_EXTHDR_CHECK(m, off, icmp6len,); 556 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 557 #else 558 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 559 if (nd_na == NULL) { 560 icmp6stat.icp6s_tooshort++; 561 return; 562 } 563 #endif 564 taddr6 = nd_na->nd_na_target; 565 flags = nd_na->nd_na_flags_reserved; 566 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 567 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 568 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 569 570 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 571 taddr6.s6_addr16[1] = htons(ifp->if_index); 572 573 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 574 nd6log((LOG_ERR, 575 "nd6_na_input: invalid target address %s\n", 576 ip6_sprintf(&taddr6))); 577 goto bad; 578 } 579 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 580 if (is_solicited) { 581 nd6log((LOG_ERR, 582 "nd6_na_input: a solicited adv is multicasted\n")); 583 goto bad; 584 } 585 586 icmp6len -= sizeof(*nd_na); 587 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 588 if (nd6_options(&ndopts) < 0) { 589 nd6log((LOG_INFO, 590 "nd6_na_input: invalid ND option, ignored\n")); 591 /* nd6_options have incremented stats */ 592 goto freeit; 593 } 594 595 if (ndopts.nd_opts_tgt_lladdr) { 596 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 597 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 598 } 599 600 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 601 602 /* 603 * Target address matches one of my interface address. 604 * 605 * If my address is tentative, this means that there's somebody 606 * already using the same address as mine. This indicates DAD failure. 607 * This is defined in RFC 2462. 608 * 609 * Otherwise, process as defined in RFC 2461. 610 */ 611 if (ifa 612 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 613 nd6_dad_na_input(ifa); 614 goto freeit; 615 } 616 617 /* Just for safety, maybe unnecessary. */ 618 if (ifa) { 619 log(LOG_ERR, 620 "nd6_na_input: duplicate IP6 address %s\n", 621 ip6_sprintf(&taddr6)); 622 goto freeit; 623 } 624 625 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 626 nd6log((LOG_INFO, 627 "nd6_na_input: lladdrlen mismatch for %s " 628 "(if %d, NA packet %d)\n", 629 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 630 goto bad; 631 } 632 633 /* 634 * If no neighbor cache entry is found, NA SHOULD silently be discarded. 635 */ 636 rt = nd6_lookup(&taddr6, 0, ifp); 637 if ((rt == NULL) || 638 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 639 ((sdl = SDL(rt->rt_gateway)) == NULL)) 640 goto freeit; 641 642 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 643 /* 644 * If the link-layer has address, and no lladdr option came, 645 * discard the packet. 646 */ 647 if (ifp->if_addrlen && !lladdr) 648 goto freeit; 649 650 /* 651 * Record link-layer address, and update the state. 652 */ 653 sdl->sdl_alen = ifp->if_addrlen; 654 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 655 if (is_solicited) { 656 ln->ln_state = ND6_LLINFO_REACHABLE; 657 ln->ln_byhint = 0; 658 if (ln->ln_expire) 659 ln->ln_expire = time_second + 660 nd_ifinfo[rt->rt_ifp->if_index].reachable; 661 } else { 662 ln->ln_state = ND6_LLINFO_STALE; 663 ln->ln_expire = time_second + nd6_gctimer; 664 } 665 if ((ln->ln_router = is_router) != 0) { 666 /* 667 * This means a router's state has changed from 668 * non-reachable to probably reachable, and might 669 * affect the status of associated prefixes.. 670 */ 671 pfxlist_onlink_check(); 672 } 673 } else { 674 int llchange; 675 676 /* 677 * Check if the link-layer address has changed or not. 678 */ 679 if (!lladdr) 680 llchange = 0; 681 else { 682 if (sdl->sdl_alen) { 683 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 684 llchange = 1; 685 else 686 llchange = 0; 687 } else 688 llchange = 1; 689 } 690 691 /* 692 * This is VERY complex. Look at it with care. 693 * 694 * override solicit lladdr llchange action 695 * (L: record lladdr) 696 * 697 * 0 0 n -- (2c) 698 * 0 0 y n (2b) L 699 * 0 0 y y (1) REACHABLE->STALE 700 * 0 1 n -- (2c) *->REACHABLE 701 * 0 1 y n (2b) L *->REACHABLE 702 * 0 1 y y (1) REACHABLE->STALE 703 * 1 0 n -- (2a) 704 * 1 0 y n (2a) L 705 * 1 0 y y (2a) L *->STALE 706 * 1 1 n -- (2a) *->REACHABLE 707 * 1 1 y n (2a) L *->REACHABLE 708 * 1 1 y y (2a) L *->REACHABLE 709 */ 710 if (!is_override && (lladdr && llchange)) { /* (1) */ 711 /* 712 * If state is REACHABLE, make it STALE. 713 * no other updates should be done. 714 */ 715 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 716 ln->ln_state = ND6_LLINFO_STALE; 717 ln->ln_expire = time_second + nd6_gctimer; 718 } 719 goto freeit; 720 } else if (is_override /* (2a) */ 721 || (!is_override && (lladdr && !llchange)) /* (2b) */ 722 || !lladdr) { /* (2c) */ 723 /* 724 * Update link-local address, if any. 725 */ 726 if (lladdr) { 727 sdl->sdl_alen = ifp->if_addrlen; 728 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 729 } 730 731 /* 732 * If solicited, make the state REACHABLE. 733 * If not solicited and the link-layer address was 734 * changed, make it STALE. 735 */ 736 if (is_solicited) { 737 ln->ln_state = ND6_LLINFO_REACHABLE; 738 ln->ln_byhint = 0; 739 if (ln->ln_expire) { 740 ln->ln_expire = time_second + 741 nd_ifinfo[ifp->if_index].reachable; 742 } 743 } else { 744 if (lladdr && llchange) { 745 ln->ln_state = ND6_LLINFO_STALE; 746 ln->ln_expire = time_second + nd6_gctimer; 747 } 748 } 749 } 750 751 if (ln->ln_router && !is_router) { 752 /* 753 * The peer dropped the router flag. 754 * Remove the sender from the Default Router List and 755 * update the Destination Cache entries. 756 */ 757 struct nd_defrouter *dr; 758 struct in6_addr *in6; 759 int s; 760 761 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 762 763 /* 764 * Lock to protect the default router list. 765 * XXX: this might be unnecessary, since this function 766 * is only called under the network software interrupt 767 * context. However, we keep it just for safety. 768 */ 769 s = splnet(); 770 dr = defrouter_lookup(in6, rt->rt_ifp); 771 if (dr) 772 defrtrlist_del(dr); 773 else if (!ip6_forwarding && ip6_accept_rtadv) { 774 /* 775 * Even if the neighbor is not in the default 776 * router list, the neighbor may be used 777 * as a next hop for some destinations 778 * (e.g. redirect case). So we must 779 * call rt6_flush explicitly. 780 */ 781 rt6_flush(&ip6->ip6_src, rt->rt_ifp); 782 } 783 splx(s); 784 } 785 ln->ln_router = is_router; 786 } 787 rt->rt_flags &= ~RTF_REJECT; 788 ln->ln_asked = 0; 789 if (ln->ln_hold) { 790 /* 791 * we assume ifp is not a loopback here, so just set the 2nd 792 * argument as the 1st one. 793 */ 794 nd6_output(ifp, ifp, ln->ln_hold, 795 (struct sockaddr_in6 *)rt_key(rt), rt); 796 ln->ln_hold = 0; 797 } 798 799 freeit: 800 m_freem(m); 801 return; 802 803 bad: 804 icmp6stat.icp6s_badna++; 805 m_freem(m); 806 } 807 808 /* 809 * Neighbor advertisement output handling. 810 * 811 * Based on RFC 2461 812 * 813 * the following items are not implemented yet: 814 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 815 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 816 */ 817 void 818 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6, 819 const struct in6_addr *taddr6, u_long flags, 820 int tlladdr, /* 1 if include target link-layer address */ 821 struct sockaddr *sdl0) /* sockaddr_dl (= proxy NA) or NULL */ 822 { 823 struct mbuf *m; 824 struct ip6_hdr *ip6; 825 struct nd_neighbor_advert *nd_na; 826 struct in6_ifaddr *ia = NULL; 827 struct ip6_moptions im6o; 828 int icmp6len; 829 int maxlen; 830 caddr_t mac; 831 struct ifnet *outif = NULL; 832 833 /* estimate the size of message */ 834 maxlen = sizeof(*ip6) + sizeof(*nd_na); 835 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 836 if (max_linkhdr + maxlen >= MCLBYTES) { 837 #ifdef DIAGNOSTIC 838 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 839 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 840 #endif 841 return; 842 } 843 844 MGETHDR(m, MB_DONTWAIT, MT_DATA); 845 if (m && max_linkhdr + maxlen >= MHLEN) { 846 MCLGET(m, MB_DONTWAIT); 847 if ((m->m_flags & M_EXT) == 0) { 848 m_free(m); 849 m = NULL; 850 } 851 } 852 if (m == NULL) 853 return; 854 m->m_pkthdr.rcvif = NULL; 855 856 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 857 m->m_flags |= M_MCAST; 858 im6o.im6o_multicast_ifp = ifp; 859 im6o.im6o_multicast_hlim = 255; 860 im6o.im6o_multicast_loop = 0; 861 } 862 863 icmp6len = sizeof(*nd_na); 864 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 865 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 866 867 /* fill neighbor advertisement packet */ 868 ip6 = mtod(m, struct ip6_hdr *); 869 ip6->ip6_flow = 0; 870 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 871 ip6->ip6_vfc |= IPV6_VERSION; 872 ip6->ip6_nxt = IPPROTO_ICMPV6; 873 ip6->ip6_hlim = 255; 874 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 875 /* reply to DAD */ 876 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 877 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 878 ip6->ip6_dst.s6_addr32[1] = 0; 879 ip6->ip6_dst.s6_addr32[2] = 0; 880 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 881 flags &= ~ND_NA_FLAG_SOLICITED; 882 } else 883 ip6->ip6_dst = *daddr6; 884 885 /* 886 * Select a source whose scope is the same as that of the dest. 887 */ 888 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 889 if (ia == NULL) { 890 m_freem(m); 891 return; 892 } 893 ip6->ip6_src = ia->ia_addr.sin6_addr; 894 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 895 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 896 nd_na->nd_na_code = 0; 897 nd_na->nd_na_target = *taddr6; 898 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target)) 899 nd_na->nd_na_target.s6_addr16[1] = 0; 900 901 /* 902 * "tlladdr" indicates NS's condition for adding tlladdr or not. 903 * see nd6_ns_input() for details. 904 * Basically, if NS packet is sent to unicast/anycast addr, 905 * target lladdr option SHOULD NOT be included. 906 */ 907 if (tlladdr) { 908 mac = NULL; 909 /* 910 * sdl0 != NULL indicates proxy NA. If we do proxy, use 911 * lladdr in sdl0. If we are not proxying (sending NA for 912 * my address) use lladdr configured for the interface. 913 */ 914 if (sdl0 == NULL) 915 mac = nd6_ifptomac(ifp); 916 else if (sdl0->sa_family == AF_LINK) { 917 struct sockaddr_dl *sdl; 918 sdl = (struct sockaddr_dl *)sdl0; 919 if (sdl->sdl_alen == ifp->if_addrlen) 920 mac = LLADDR(sdl); 921 } 922 } 923 if (tlladdr && mac) { 924 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 925 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 926 927 /* roundup to 8 bytes alignment! */ 928 optlen = (optlen + 7) & ~7; 929 930 m->m_pkthdr.len += optlen; 931 m->m_len += optlen; 932 icmp6len += optlen; 933 bzero((caddr_t)nd_opt, optlen); 934 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 935 nd_opt->nd_opt_len = optlen >> 3; 936 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 937 } else 938 flags &= ~ND_NA_FLAG_OVERRIDE; 939 940 ip6->ip6_plen = htons((u_short)icmp6len); 941 nd_na->nd_na_flags_reserved = flags; 942 nd_na->nd_na_cksum = 0; 943 nd_na->nd_na_cksum = 944 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 945 946 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL); 947 if (outif) { 948 icmp6_ifstat_inc(outif, ifs6_out_msg); 949 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); 950 } 951 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 952 } 953 954 caddr_t 955 nd6_ifptomac(struct ifnet *ifp) 956 { 957 switch (ifp->if_type) { 958 case IFT_ARCNET: 959 case IFT_ETHER: 960 case IFT_FDDI: 961 case IFT_IEEE1394: 962 #ifdef IFT_L2VLAN 963 case IFT_L2VLAN: 964 #endif 965 #ifdef IFT_IEEE80211 966 case IFT_IEEE80211: 967 #endif 968 return ((caddr_t)(ifp + 1)); 969 break; 970 default: 971 return NULL; 972 } 973 } 974 975 TAILQ_HEAD(dadq_head, dadq); 976 struct dadq { 977 TAILQ_ENTRY(dadq) dad_list; 978 struct ifaddr *dad_ifa; 979 int dad_count; /* max NS to send */ 980 int dad_ns_tcount; /* # of trials to send NS */ 981 int dad_ns_ocount; /* NS sent so far */ 982 int dad_ns_icount; 983 int dad_na_icount; 984 struct callout dad_timer_ch; 985 }; 986 987 static struct dadq_head dadq; 988 static int dad_init = 0; 989 990 static struct dadq * 991 nd6_dad_find(struct ifaddr *ifa) 992 { 993 struct dadq *dp; 994 995 TAILQ_FOREACH(dp, &dadq, dad_list) { 996 if (dp->dad_ifa == ifa) 997 return dp; 998 } 999 return NULL; 1000 } 1001 1002 static void 1003 nd6_dad_starttimer(struct dadq *dp, int ticks) 1004 { 1005 1006 callout_reset(&dp->dad_timer_ch, ticks, 1007 (void (*) (void *))nd6_dad_timer, (void *)dp->dad_ifa); 1008 } 1009 1010 static void 1011 nd6_dad_stoptimer(struct dadq *dp) 1012 { 1013 1014 callout_stop(&dp->dad_timer_ch); 1015 } 1016 1017 /* 1018 * Start Duplicated Address Detection (DAD) for specified interface address. 1019 */ 1020 void 1021 nd6_dad_start(struct ifaddr *ifa, 1022 int *tick) /* minimum delay ticks for IFF_UP event */ 1023 { 1024 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1025 struct dadq *dp; 1026 1027 if (!dad_init) { 1028 TAILQ_INIT(&dadq); 1029 dad_init++; 1030 } 1031 1032 /* 1033 * If we don't need DAD, don't do it. 1034 * There are several cases: 1035 * - DAD is disabled (ip6_dad_count == 0) 1036 * - the interface address is anycast 1037 */ 1038 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1039 log(LOG_DEBUG, 1040 "nd6_dad_start: called with non-tentative address " 1041 "%s(%s)\n", 1042 ip6_sprintf(&ia->ia_addr.sin6_addr), 1043 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1044 return; 1045 } 1046 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1047 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1048 return; 1049 } 1050 if (!ip6_dad_count) { 1051 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1052 return; 1053 } 1054 if (!ifa->ifa_ifp) 1055 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1056 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1057 return; 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); 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->if_index].retrans * hz / 1000); 1093 } else { 1094 int ntick; 1095 1096 if (*tick == 0) 1097 ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1098 else 1099 ntick = *tick + random() % (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(struct ifaddr *ifa) 1110 { 1111 struct dadq *dp; 1112 1113 if (!dad_init) 1114 return; 1115 dp = nd6_dad_find(ifa); 1116 if (!dp) { 1117 /* DAD wasn't started yet */ 1118 return; 1119 } 1120 1121 nd6_dad_stoptimer(dp); 1122 1123 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1124 free(dp, M_IP6NDP); 1125 dp = NULL; 1126 IFAFREE(ifa); 1127 } 1128 1129 static void 1130 nd6_dad_timer(struct ifaddr *ifa) 1131 { 1132 int s; 1133 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1134 struct dadq *dp; 1135 1136 s = splnet(); /* XXX */ 1137 1138 /* Sanity check */ 1139 if (ia == NULL) { 1140 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1141 goto done; 1142 } 1143 dp = nd6_dad_find(ifa); 1144 if (dp == NULL) { 1145 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1146 goto done; 1147 } 1148 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1149 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1150 "%s(%s)\n", 1151 ip6_sprintf(&ia->ia_addr.sin6_addr), 1152 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1153 goto done; 1154 } 1155 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1156 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1157 "%s(%s)\n", 1158 ip6_sprintf(&ia->ia_addr.sin6_addr), 1159 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1160 goto done; 1161 } 1162 1163 /* timeouted with IFF_{RUNNING,UP} check */ 1164 if (dp->dad_ns_tcount > dad_maxtry) { 1165 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1166 if_name(ifa->ifa_ifp))); 1167 1168 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1169 free(dp, M_IP6NDP); 1170 dp = NULL; 1171 IFAFREE(ifa); 1172 goto done; 1173 } 1174 1175 /* Need more checks? */ 1176 if (dp->dad_ns_ocount < dp->dad_count) { 1177 /* 1178 * We have more NS to go. Send NS packet for DAD. 1179 */ 1180 nd6_dad_ns_output(dp, ifa); 1181 nd6_dad_starttimer(dp, 1182 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1183 } else { 1184 /* 1185 * We have transmitted sufficient number of DAD packets. 1186 * See what we've got. 1187 */ 1188 int duplicate; 1189 1190 duplicate = 0; 1191 1192 if (dp->dad_na_icount) { 1193 /* 1194 * the check is in nd6_dad_na_input(), 1195 * but just in case 1196 */ 1197 duplicate++; 1198 } 1199 1200 if (dp->dad_ns_icount) { 1201 #if 0 /* heuristics */ 1202 /* 1203 * if 1204 * - we have sent many(?) DAD NS, and 1205 * - the number of NS we sent equals to the 1206 * number of NS we've got, and 1207 * - we've got no NA 1208 * we may have a faulty network card/driver which 1209 * loops back multicasts to myself. 1210 */ 1211 if (3 < dp->dad_count 1212 && dp->dad_ns_icount == dp->dad_count 1213 && dp->dad_na_icount == 0) { 1214 log(LOG_INFO, "DAD questionable for %s(%s): " 1215 "network card loops back multicast?\n", 1216 ip6_sprintf(&ia->ia_addr.sin6_addr), 1217 if_name(ifa->ifa_ifp)); 1218 /* XXX consider it a duplicate or not? */ 1219 /* duplicate++; */ 1220 } else { 1221 /* We've seen NS, means DAD has failed. */ 1222 duplicate++; 1223 } 1224 #else 1225 /* We've seen NS, means DAD has failed. */ 1226 duplicate++; 1227 #endif 1228 } 1229 1230 if (duplicate) { 1231 /* (*dp) will be freed in nd6_dad_duplicated() */ 1232 dp = NULL; 1233 nd6_dad_duplicated(ifa); 1234 } else { 1235 /* 1236 * We are done with DAD. No NA came, no NS came. 1237 * duplicated address found. 1238 */ 1239 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1240 1241 nd6log((LOG_DEBUG, 1242 "%s: DAD complete for %s - no duplicates found\n", 1243 if_name(ifa->ifa_ifp), 1244 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1245 1246 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1247 free(dp, M_IP6NDP); 1248 dp = NULL; 1249 IFAFREE(ifa); 1250 } 1251 } 1252 1253 done: 1254 splx(s); 1255 } 1256 1257 void 1258 nd6_dad_duplicated(struct ifaddr *ifa) 1259 { 1260 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1261 struct dadq *dp; 1262 1263 dp = nd6_dad_find(ifa); 1264 if (dp == NULL) { 1265 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1266 return; 1267 } 1268 1269 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1270 "NS in/out=%d/%d, NA in=%d\n", 1271 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1272 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1273 1274 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1275 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1276 1277 /* We are done with DAD, with duplicated address found. (failure) */ 1278 nd6_dad_stoptimer(dp); 1279 1280 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1281 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1282 log(LOG_ERR, "%s: manual intervention required\n", 1283 if_name(ifa->ifa_ifp)); 1284 1285 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1286 free(dp, M_IP6NDP); 1287 dp = NULL; 1288 IFAFREE(ifa); 1289 } 1290 1291 static void 1292 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 1293 { 1294 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1295 struct ifnet *ifp = ifa->ifa_ifp; 1296 1297 dp->dad_ns_tcount++; 1298 if ((ifp->if_flags & IFF_UP) == 0) { 1299 #if 0 1300 printf("%s: interface down?\n", if_name(ifp)); 1301 #endif 1302 return; 1303 } 1304 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1305 #if 0 1306 printf("%s: interface not running?\n", if_name(ifp)); 1307 #endif 1308 return; 1309 } 1310 1311 dp->dad_ns_ocount++; 1312 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1313 } 1314 1315 static void 1316 nd6_dad_ns_input(struct ifaddr *ifa) 1317 { 1318 struct in6_ifaddr *ia; 1319 struct ifnet *ifp; 1320 const struct in6_addr *taddr6; 1321 struct dadq *dp; 1322 int duplicate; 1323 1324 if (!ifa) 1325 panic("ifa == NULL in nd6_dad_ns_input"); 1326 1327 ia = (struct in6_ifaddr *)ifa; 1328 ifp = ifa->ifa_ifp; 1329 taddr6 = &ia->ia_addr.sin6_addr; 1330 duplicate = 0; 1331 dp = nd6_dad_find(ifa); 1332 1333 /* Quickhack - completely ignore DAD NS packets */ 1334 if (dad_ignore_ns) { 1335 nd6log((LOG_INFO, 1336 "nd6_dad_ns_input: ignoring DAD NS packet for " 1337 "address %s(%s)\n", ip6_sprintf(taddr6), 1338 if_name(ifa->ifa_ifp))); 1339 return; 1340 } 1341 1342 /* 1343 * if I'm yet to start DAD, someone else started using this address 1344 * first. I have a duplicate and you win. 1345 */ 1346 if (!dp || dp->dad_ns_ocount == 0) 1347 duplicate++; 1348 1349 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1350 1351 if (duplicate) { 1352 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1353 nd6_dad_duplicated(ifa); 1354 } else { 1355 /* 1356 * not sure if I got a duplicate. 1357 * increment ns count and see what happens. 1358 */ 1359 if (dp) 1360 dp->dad_ns_icount++; 1361 } 1362 } 1363 1364 static void 1365 nd6_dad_na_input(struct ifaddr *ifa) 1366 { 1367 struct dadq *dp; 1368 1369 if (!ifa) 1370 panic("ifa == NULL in nd6_dad_na_input"); 1371 1372 dp = nd6_dad_find(ifa); 1373 if (dp) 1374 dp->dad_na_icount++; 1375 1376 /* remove the address. */ 1377 nd6_dad_duplicated(ifa); 1378 } 1379