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sys/netinet6/nd6_nbr.c
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1 /* $FreeBSD: releng/6.0/sys/netinet6/nd6_nbr.c 150099 2005-09-13 18:02:39Z thompsa $ */ 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 #include "opt_carp.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/if_var.h> 55 #include <net/route.h> 56 57 #include <netinet/in.h> 58 #include <netinet/in_var.h> 59 #include <netinet6/in6_var.h> 60 #include <netinet/ip6.h> 61 #include <netinet6/ip6_var.h> 62 #include <netinet6/nd6.h> 63 #include <netinet/icmp6.h> 64 65 #ifdef DEV_CARP 66 #include <netinet/ip_carp.h> 67 #endif 68 69 #include <net/net_osdep.h> 70 71 #define SDL(s) ((struct sockaddr_dl *)s) 72 73 struct dadq; 74 static struct dadq *nd6_dad_find __P((struct ifaddr *)); 75 static void nd6_dad_starttimer __P((struct dadq *, int)); 76 static void nd6_dad_stoptimer __P((struct dadq *)); 77 static void nd6_dad_timer __P((struct ifaddr *)); 78 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 79 static void nd6_dad_ns_input __P((struct ifaddr *)); 80 static void nd6_dad_na_input __P((struct ifaddr *)); 81 82 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 83 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 84 85 /* 86 * Input a Neighbor Solicitation Message. 87 * 88 * Based on RFC 2461 89 * Based on RFC 2462 (duplicated address detection) 90 */ 91 void 92 nd6_ns_input(m, off, icmp6len) 93 struct mbuf *m; 94 int off, icmp6len; 95 { 96 struct ifnet *ifp = m->m_pkthdr.rcvif; 97 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 98 struct nd_neighbor_solicit *nd_ns; 99 struct in6_addr saddr6 = ip6->ip6_src; 100 struct in6_addr daddr6 = ip6->ip6_dst; 101 struct in6_addr taddr6; 102 struct in6_addr myaddr6; 103 char *lladdr = NULL; 104 struct ifaddr *ifa = NULL; 105 int lladdrlen = 0; 106 int anycast = 0, proxy = 0, tentative = 0; 107 int tlladdr; 108 union nd_opts ndopts; 109 struct sockaddr_dl *proxydl = NULL; 110 111 #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 #ifdef DEV_CARP 204 if (ifp->if_carp) 205 ifa = carp_iamatch6(ifp->if_carp, &taddr6); 206 if (!ifa) 207 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 208 #else 209 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 210 #endif 211 212 /* (2) check. */ 213 if (!ifa) { 214 struct rtentry *rt; 215 struct sockaddr_in6 tsin6; 216 int need_proxy; 217 218 bzero(&tsin6, sizeof tsin6); 219 tsin6.sin6_len = sizeof(struct sockaddr_in6); 220 tsin6.sin6_family = AF_INET6; 221 tsin6.sin6_addr = taddr6; 222 223 rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 224 need_proxy = (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 225 rt->rt_gateway->sa_family == AF_LINK); 226 if (rt) 227 rtfree(rt); 228 if (need_proxy) { 229 /* 230 * proxy NDP for single entry 231 */ 232 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 233 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 234 if (ifa) { 235 proxy = 1; 236 proxydl = SDL(rt->rt_gateway); 237 } 238 } 239 } 240 if (!ifa) { 241 /* 242 * We've got an NS packet, and we don't have that adddress 243 * assigned for us. We MUST silently ignore it. 244 * See RFC2461 7.2.3. 245 */ 246 goto freeit; 247 } 248 myaddr6 = *IFA_IN6(ifa); 249 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 250 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 251 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 252 goto freeit; 253 254 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 255 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 256 "(if %d, NS packet %d)\n", 257 ip6_sprintf(&taddr6), 258 ifp->if_addrlen, lladdrlen - 2)); 259 goto bad; 260 } 261 262 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 263 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 264 ip6_sprintf(&saddr6))); 265 goto freeit; 266 } 267 268 /* 269 * We have neighbor solicitation packet, with target address equals to 270 * one of my tentative address. 271 * 272 * src addr how to process? 273 * --- --- 274 * multicast of course, invalid (rejected in ip6_input) 275 * unicast somebody is doing address resolution -> ignore 276 * unspec dup address detection 277 * 278 * The processing is defined in RFC 2462. 279 */ 280 if (tentative) { 281 /* 282 * If source address is unspecified address, it is for 283 * duplicated address detection. 284 * 285 * If not, the packet is for addess resolution; 286 * silently ignore it. 287 */ 288 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 289 nd6_dad_ns_input(ifa); 290 291 goto freeit; 292 } 293 294 /* 295 * If the source address is unspecified address, entries must not 296 * be created or updated. 297 * It looks that sender is performing DAD. Output NA toward 298 * all-node multicast address, to tell the sender that I'm using 299 * the address. 300 * S bit ("solicited") must be zero. 301 */ 302 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 303 saddr6 = in6addr_linklocal_allnodes; 304 saddr6.s6_addr16[1] = htons(ifp->if_index); 305 nd6_na_output(ifp, &saddr6, &taddr6, 306 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 307 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 308 tlladdr, (struct sockaddr *)proxydl); 309 goto freeit; 310 } 311 312 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, 313 ND_NEIGHBOR_SOLICIT, 0); 314 315 nd6_na_output(ifp, &saddr6, &taddr6, 316 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 317 (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 318 tlladdr, (struct sockaddr *)proxydl); 319 freeit: 320 m_freem(m); 321 return; 322 323 bad: 324 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 325 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 326 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 327 icmp6stat.icp6s_badns++; 328 m_freem(m); 329 } 330 331 /* 332 * Output a Neighbor Solicitation Message. Caller specifies: 333 * - ICMP6 header source IP6 address 334 * - ND6 header target IP6 address 335 * - ND6 header source datalink address 336 * 337 * Based on RFC 2461 338 * Based on RFC 2462 (duplicated address detection) 339 */ 340 void 341 nd6_ns_output(ifp, daddr6, taddr6, ln, dad) 342 struct ifnet *ifp; 343 const struct in6_addr *daddr6, *taddr6; 344 struct llinfo_nd6 *ln; /* for source address determination */ 345 int dad; /* duplicated address detection */ 346 { 347 struct mbuf *m; 348 struct ip6_hdr *ip6; 349 struct nd_neighbor_solicit *nd_ns; 350 struct in6_ifaddr *ia = NULL; 351 struct ip6_moptions im6o; 352 int icmp6len; 353 int maxlen; 354 caddr_t mac; 355 struct ifnet *outif = NULL; 356 357 if (IN6_IS_ADDR_MULTICAST(taddr6)) 358 return; 359 360 /* estimate the size of message */ 361 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 362 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 363 if (max_linkhdr + maxlen >= MCLBYTES) { 364 #ifdef DIAGNOSTIC 365 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 366 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 367 #endif 368 return; 369 } 370 371 MGETHDR(m, M_DONTWAIT, MT_DATA); 372 if (m && max_linkhdr + maxlen >= MHLEN) { 373 MCLGET(m, M_DONTWAIT); 374 if ((m->m_flags & M_EXT) == 0) { 375 m_free(m); 376 m = NULL; 377 } 378 } 379 if (m == NULL) 380 return; 381 m->m_pkthdr.rcvif = NULL; 382 383 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 384 m->m_flags |= M_MCAST; 385 im6o.im6o_multicast_ifp = ifp; 386 im6o.im6o_multicast_hlim = 255; 387 im6o.im6o_multicast_loop = 0; 388 } 389 390 icmp6len = sizeof(*nd_ns); 391 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 392 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 393 394 /* fill neighbor solicitation packet */ 395 ip6 = mtod(m, struct ip6_hdr *); 396 ip6->ip6_flow = 0; 397 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 398 ip6->ip6_vfc |= IPV6_VERSION; 399 /* ip6->ip6_plen will be set later */ 400 ip6->ip6_nxt = IPPROTO_ICMPV6; 401 ip6->ip6_hlim = 255; 402 if (daddr6) 403 ip6->ip6_dst = *daddr6; 404 else { 405 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 406 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 407 ip6->ip6_dst.s6_addr32[1] = 0; 408 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 409 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 410 ip6->ip6_dst.s6_addr8[12] = 0xff; 411 } 412 if (!dad) { 413 /* 414 * RFC2461 7.2.2: 415 * "If the source address of the packet prompting the 416 * solicitation is the same as one of the addresses assigned 417 * to the outgoing interface, that address SHOULD be placed 418 * in the IP Source Address of the outgoing solicitation. 419 * Otherwise, any one of the addresses assigned to the 420 * interface should be used." 421 * 422 * We use the source address for the prompting packet 423 * (saddr6), if: 424 * - saddr6 is given from the caller (by giving "ln"), and 425 * - saddr6 belongs to the outgoing interface. 426 * Otherwise, we perform a scope-wise match. 427 */ 428 struct ip6_hdr *hip6; /* hold ip6 */ 429 struct in6_addr *saddr6; 430 431 if (ln && ln->ln_hold) { 432 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 433 /* XXX pullup? */ 434 if (sizeof(*hip6) < ln->ln_hold->m_len) 435 saddr6 = &hip6->ip6_src; 436 else 437 saddr6 = NULL; 438 } else 439 saddr6 = NULL; 440 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 441 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 442 else { 443 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 444 if (ia == NULL) { 445 m_freem(m); 446 return; 447 } 448 ip6->ip6_src = ia->ia_addr.sin6_addr; 449 } 450 } else { 451 /* 452 * Source address for DAD packet must always be IPv6 453 * unspecified address. (0::0) 454 */ 455 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 456 } 457 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 458 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 459 nd_ns->nd_ns_code = 0; 460 nd_ns->nd_ns_reserved = 0; 461 nd_ns->nd_ns_target = *taddr6; 462 in6_clearscope(&nd_ns->nd_ns_target); /* XXX */ 463 464 /* 465 * Add source link-layer address option. 466 * 467 * spec implementation 468 * --- --- 469 * DAD packet MUST NOT do not add the option 470 * there's no link layer address: 471 * impossible do not add the option 472 * there's link layer address: 473 * Multicast NS MUST add one add the option 474 * Unicast NS SHOULD add one add the option 475 */ 476 if (!dad && (mac = nd6_ifptomac(ifp))) { 477 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 478 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 479 /* 8 byte alignments... */ 480 optlen = (optlen + 7) & ~7; 481 482 m->m_pkthdr.len += optlen; 483 m->m_len += optlen; 484 icmp6len += optlen; 485 bzero((caddr_t)nd_opt, optlen); 486 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 487 nd_opt->nd_opt_len = optlen >> 3; 488 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 489 } 490 491 ip6->ip6_plen = htons((u_short)icmp6len); 492 nd_ns->nd_ns_cksum = 0; 493 nd_ns->nd_ns_cksum = 494 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 495 496 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif, NULL); 497 if (outif) { 498 icmp6_ifstat_inc(outif, ifs6_out_msg); 499 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); 500 } 501 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 502 } 503 504 /* 505 * Neighbor advertisement input handling. 506 * 507 * Based on RFC 2461 508 * Based on RFC 2462 (duplicated address detection) 509 * 510 * the following items are not implemented yet: 511 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 512 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 513 */ 514 void 515 nd6_na_input(m, off, icmp6len) 516 struct mbuf *m; 517 int off, icmp6len; 518 { 519 struct ifnet *ifp = m->m_pkthdr.rcvif; 520 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 521 struct nd_neighbor_advert *nd_na; 522 struct in6_addr daddr6 = ip6->ip6_dst; 523 struct in6_addr taddr6; 524 int flags; 525 int is_router; 526 int is_solicited; 527 int is_override; 528 char *lladdr = NULL; 529 int lladdrlen = 0; 530 struct ifaddr *ifa; 531 struct llinfo_nd6 *ln; 532 struct rtentry *rt; 533 struct sockaddr_dl *sdl; 534 union nd_opts ndopts; 535 536 if (ip6->ip6_hlim != 255) { 537 nd6log((LOG_ERR, 538 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 539 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 540 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 541 goto bad; 542 } 543 544 #ifndef PULLDOWN_TEST 545 IP6_EXTHDR_CHECK(m, off, icmp6len,); 546 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 547 #else 548 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 549 if (nd_na == NULL) { 550 icmp6stat.icp6s_tooshort++; 551 return; 552 } 553 #endif 554 taddr6 = nd_na->nd_na_target; 555 flags = nd_na->nd_na_flags_reserved; 556 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 557 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 558 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 559 560 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 561 taddr6.s6_addr16[1] = htons(ifp->if_index); 562 563 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 564 nd6log((LOG_ERR, 565 "nd6_na_input: invalid target address %s\n", 566 ip6_sprintf(&taddr6))); 567 goto bad; 568 } 569 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 570 if (is_solicited) { 571 nd6log((LOG_ERR, 572 "nd6_na_input: a solicited adv is multicasted\n")); 573 goto bad; 574 } 575 576 icmp6len -= sizeof(*nd_na); 577 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 578 if (nd6_options(&ndopts) < 0) { 579 nd6log((LOG_INFO, 580 "nd6_na_input: invalid ND option, ignored\n")); 581 /* nd6_options have incremented stats */ 582 goto freeit; 583 } 584 585 if (ndopts.nd_opts_tgt_lladdr) { 586 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 587 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 588 } 589 590 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 591 592 /* 593 * Target address matches one of my interface address. 594 * 595 * If my address is tentative, this means that there's somebody 596 * already using the same address as mine. This indicates DAD failure. 597 * This is defined in RFC 2462. 598 * 599 * Otherwise, process as defined in RFC 2461. 600 */ 601 if (ifa 602 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 603 nd6_dad_na_input(ifa); 604 goto freeit; 605 } 606 607 /* Just for safety, maybe unnecessary. */ 608 if (ifa) { 609 log(LOG_ERR, 610 "nd6_na_input: duplicate IP6 address %s\n", 611 ip6_sprintf(&taddr6)); 612 goto freeit; 613 } 614 615 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 616 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 617 "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6), 618 ifp->if_addrlen, lladdrlen - 2)); 619 goto bad; 620 } 621 622 /* 623 * If no neighbor cache entry is found, NA SHOULD silently be 624 * 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 ln->ln_byhint = 0; 648 if (ln->ln_expire) { 649 ln->ln_expire = time_second + 650 ND_IFINFO(rt->rt_ifp)->reachable; 651 } 652 } else { 653 ln->ln_state = ND6_LLINFO_STALE; 654 ln->ln_expire = time_second + nd6_gctimer; 655 } 656 if ((ln->ln_router = is_router) != 0) { 657 /* 658 * This means a router's state has changed from 659 * non-reachable to probably reachable, and might 660 * affect the status of associated prefixes.. 661 */ 662 pfxlist_onlink_check(); 663 } 664 } else { 665 int llchange; 666 667 /* 668 * Check if the link-layer address has changed or not. 669 */ 670 if (!lladdr) 671 llchange = 0; 672 else { 673 if (sdl->sdl_alen) { 674 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 675 llchange = 1; 676 else 677 llchange = 0; 678 } else 679 llchange = 1; 680 } 681 682 /* 683 * This is VERY complex. Look at it with care. 684 * 685 * override solicit lladdr llchange action 686 * (L: record lladdr) 687 * 688 * 0 0 n -- (2c) 689 * 0 0 y n (2b) L 690 * 0 0 y y (1) REACHABLE->STALE 691 * 0 1 n -- (2c) *->REACHABLE 692 * 0 1 y n (2b) L *->REACHABLE 693 * 0 1 y y (1) REACHABLE->STALE 694 * 1 0 n -- (2a) 695 * 1 0 y n (2a) L 696 * 1 0 y y (2a) L *->STALE 697 * 1 1 n -- (2a) *->REACHABLE 698 * 1 1 y n (2a) L *->REACHABLE 699 * 1 1 y y (2a) L *->REACHABLE 700 */ 701 if (!is_override && (lladdr && llchange)) { /* (1) */ 702 /* 703 * If state is REACHABLE, make it STALE. 704 * no other updates should be done. 705 */ 706 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 707 ln->ln_state = ND6_LLINFO_STALE; 708 ln->ln_expire = time_second + nd6_gctimer; 709 } 710 goto freeit; 711 } else if (is_override /* (2a) */ 712 || (!is_override && (lladdr && !llchange)) /* (2b) */ 713 || !lladdr) { /* (2c) */ 714 /* 715 * Update link-local address, if any. 716 */ 717 if (lladdr) { 718 sdl->sdl_alen = ifp->if_addrlen; 719 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 720 } 721 722 /* 723 * If solicited, make the state REACHABLE. 724 * If not solicited and the link-layer address was 725 * changed, make it STALE. 726 */ 727 if (is_solicited) { 728 ln->ln_state = ND6_LLINFO_REACHABLE; 729 ln->ln_byhint = 0; 730 if (ln->ln_expire) { 731 ln->ln_expire = time_second + 732 ND_IFINFO(ifp)->reachable; 733 } 734 } else { 735 if (lladdr && llchange) { 736 ln->ln_state = ND6_LLINFO_STALE; 737 ln->ln_expire = time_second + nd6_gctimer; 738 } 739 } 740 } 741 742 if (ln->ln_router && !is_router) { 743 /* 744 * The peer dropped the router flag. 745 * Remove the sender from the Default Router List and 746 * update the Destination Cache entries. 747 */ 748 struct nd_defrouter *dr; 749 struct in6_addr *in6; 750 int s; 751 752 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 753 754 /* 755 * Lock to protect the default router list. 756 * XXX: this might be unnecessary, since this function 757 * is only called under the network software interrupt 758 * context. However, we keep it just for safety. 759 */ 760 s = splnet(); 761 dr = defrouter_lookup(in6, ifp); 762 if (dr) 763 defrtrlist_del(dr); 764 else if (!ip6_forwarding && ip6_accept_rtadv) { 765 /* 766 * Even if the neighbor is not in the default 767 * router list, the neighbor may be used 768 * as a next hop for some destinations 769 * (e.g. redirect case). So we must 770 * call rt6_flush explicitly. 771 */ 772 rt6_flush(&ip6->ip6_src, ifp); 773 } 774 splx(s); 775 } 776 ln->ln_router = is_router; 777 } 778 rt->rt_flags &= ~RTF_REJECT; 779 ln->ln_asked = 0; 780 if (ln->ln_hold) { 781 /* 782 * we assume ifp is not a loopback here, so just set the 2nd 783 * argument as the 1st one. 784 */ 785 nd6_output(ifp, ifp, ln->ln_hold, 786 (struct sockaddr_in6 *)rt_key(rt), rt); 787 ln->ln_hold = NULL; 788 } 789 790 freeit: 791 m_freem(m); 792 return; 793 794 bad: 795 icmp6stat.icp6s_badna++; 796 m_freem(m); 797 } 798 799 /* 800 * Neighbor advertisement output handling. 801 * 802 * Based on RFC 2461 803 * 804 * the following items are not implemented yet: 805 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 806 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 807 */ 808 void 809 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 810 struct ifnet *ifp; 811 const struct in6_addr *daddr6, *taddr6; 812 u_long flags; 813 int tlladdr; /* 1 if include target link-layer address */ 814 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 815 { 816 struct mbuf *m; 817 struct ip6_hdr *ip6; 818 struct nd_neighbor_advert *nd_na; 819 struct in6_ifaddr *ia = NULL; 820 struct ip6_moptions im6o; 821 int icmp6len; 822 int maxlen; 823 caddr_t mac = NULL; 824 struct ifnet *outif = NULL; 825 826 /* estimate the size of message */ 827 maxlen = sizeof(*ip6) + sizeof(*nd_na); 828 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 829 if (max_linkhdr + maxlen >= MCLBYTES) { 830 #ifdef DIAGNOSTIC 831 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 832 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 833 #endif 834 return; 835 } 836 837 MGETHDR(m, M_DONTWAIT, MT_DATA); 838 if (m && max_linkhdr + maxlen >= MHLEN) { 839 MCLGET(m, M_DONTWAIT); 840 if ((m->m_flags & M_EXT) == 0) { 841 m_free(m); 842 m = NULL; 843 } 844 } 845 if (m == NULL) 846 return; 847 m->m_pkthdr.rcvif = NULL; 848 849 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 850 m->m_flags |= M_MCAST; 851 im6o.im6o_multicast_ifp = ifp; 852 im6o.im6o_multicast_hlim = 255; 853 im6o.im6o_multicast_loop = 0; 854 } 855 856 icmp6len = sizeof(*nd_na); 857 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 858 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 859 860 /* fill neighbor advertisement packet */ 861 ip6 = mtod(m, struct ip6_hdr *); 862 ip6->ip6_flow = 0; 863 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 864 ip6->ip6_vfc |= IPV6_VERSION; 865 ip6->ip6_nxt = IPPROTO_ICMPV6; 866 ip6->ip6_hlim = 255; 867 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 868 /* reply to DAD */ 869 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 870 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 871 ip6->ip6_dst.s6_addr32[1] = 0; 872 ip6->ip6_dst.s6_addr32[2] = 0; 873 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 874 flags &= ~ND_NA_FLAG_SOLICITED; 875 } else 876 ip6->ip6_dst = *daddr6; 877 878 /* 879 * Select a source whose scope is the same as that of the dest. 880 */ 881 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 882 if (ia == NULL) { 883 m_freem(m); 884 return; 885 } 886 ip6->ip6_src = ia->ia_addr.sin6_addr; 887 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 888 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 889 nd_na->nd_na_code = 0; 890 nd_na->nd_na_target = *taddr6; 891 in6_clearscope(&nd_na->nd_na_target); /* XXX */ 892 893 /* 894 * "tlladdr" indicates NS's condition for adding tlladdr or not. 895 * see nd6_ns_input() for details. 896 * Basically, if NS packet is sent to unicast/anycast addr, 897 * target lladdr option SHOULD NOT be included. 898 */ 899 if (tlladdr) { 900 /* 901 * sdl0 != NULL indicates proxy NA. If we do proxy, use 902 * lladdr in sdl0. If we are not proxying (sending NA for 903 * my address) use lladdr configured for the interface. 904 */ 905 if (sdl0 == NULL) { 906 #ifdef DEV_CARP 907 if (ifp->if_carp) 908 mac = carp_macmatch6(ifp->if_carp, m, taddr6); 909 if (mac == NULL) 910 mac = nd6_ifptomac(ifp); 911 #else 912 mac = nd6_ifptomac(ifp); 913 #endif 914 } else if (sdl0->sa_family == AF_LINK) { 915 struct sockaddr_dl *sdl; 916 sdl = (struct sockaddr_dl *)sdl0; 917 if (sdl->sdl_alen == ifp->if_addrlen) 918 mac = LLADDR(sdl); 919 } 920 } 921 if (tlladdr && mac) { 922 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 923 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 924 925 /* roundup to 8 bytes alignment! */ 926 optlen = (optlen + 7) & ~7; 927 928 m->m_pkthdr.len += optlen; 929 m->m_len += optlen; 930 icmp6len += optlen; 931 bzero((caddr_t)nd_opt, optlen); 932 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 933 nd_opt->nd_opt_len = optlen >> 3; 934 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 935 } else 936 flags &= ~ND_NA_FLAG_OVERRIDE; 937 938 ip6->ip6_plen = htons((u_short)icmp6len); 939 nd_na->nd_na_flags_reserved = flags; 940 nd_na->nd_na_cksum = 0; 941 nd_na->nd_na_cksum = 942 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 943 944 ip6_output(m, NULL, NULL, 0, &im6o, &outif, NULL); 945 if (outif) { 946 icmp6_ifstat_inc(outif, ifs6_out_msg); 947 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); 948 } 949 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 950 } 951 952 caddr_t 953 nd6_ifptomac(ifp) 954 struct ifnet *ifp; 955 { 956 switch (ifp->if_type) { 957 case IFT_ARCNET: 958 case IFT_ETHER: 959 case IFT_FDDI: 960 case IFT_IEEE1394: 961 #ifdef IFT_L2VLAN 962 case IFT_L2VLAN: 963 #endif 964 #ifdef IFT_IEEE80211 965 case IFT_IEEE80211: 966 #endif 967 #ifdef IFT_CARP 968 case IFT_CARP: 969 #endif 970 case IFT_BRIDGE: 971 case IFT_ISO88025: 972 return IF_LLADDR(ifp); 973 default: 974 return NULL; 975 } 976 } 977 978 TAILQ_HEAD(dadq_head, dadq); 979 struct dadq { 980 TAILQ_ENTRY(dadq) dad_list; 981 struct ifaddr *dad_ifa; 982 int dad_count; /* max NS to send */ 983 int dad_ns_tcount; /* # of trials to send NS */ 984 int dad_ns_ocount; /* NS sent so far */ 985 int dad_ns_icount; 986 int dad_na_icount; 987 struct callout dad_timer_ch; 988 }; 989 990 static struct dadq_head dadq; 991 static int dad_init = 0; 992 993 static struct dadq * 994 nd6_dad_find(ifa) 995 struct ifaddr *ifa; 996 { 997 struct dadq *dp; 998 999 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 1000 if (dp->dad_ifa == ifa) 1001 return dp; 1002 } 1003 return NULL; 1004 } 1005 1006 static void 1007 nd6_dad_starttimer(dp, ticks) 1008 struct dadq *dp; 1009 int ticks; 1010 { 1011 1012 callout_reset(&dp->dad_timer_ch, ticks, 1013 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 1014 } 1015 1016 static void 1017 nd6_dad_stoptimer(dp) 1018 struct dadq *dp; 1019 { 1020 1021 callout_stop(&dp->dad_timer_ch); 1022 } 1023 1024 /* 1025 * Start Duplicated Address Detection (DAD) for specified interface address. 1026 */ 1027 void 1028 nd6_dad_start(ifa, tick) 1029 struct ifaddr *ifa; 1030 int *tick; /* minimum delay ticks for IFF_UP event */ 1031 { 1032 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1033 struct dadq *dp; 1034 1035 if (!dad_init) { 1036 TAILQ_INIT(&dadq); 1037 dad_init++; 1038 } 1039 1040 /* 1041 * If we don't need DAD, don't do it. 1042 * There are several cases: 1043 * - DAD is disabled (ip6_dad_count == 0) 1044 * - the interface address is anycast 1045 */ 1046 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1047 log(LOG_DEBUG, 1048 "nd6_dad_start: called with non-tentative address " 1049 "%s(%s)\n", 1050 ip6_sprintf(&ia->ia_addr.sin6_addr), 1051 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1052 return; 1053 } 1054 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1055 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1056 return; 1057 } 1058 if (!ip6_dad_count) { 1059 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1060 return; 1061 } 1062 if (!ifa->ifa_ifp) 1063 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1064 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) { 1065 return; 1066 } 1067 if (nd6_dad_find(ifa) != NULL) { 1068 /* DAD already in progress */ 1069 return; 1070 } 1071 1072 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1073 if (dp == NULL) { 1074 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1075 "%s(%s)\n", 1076 ip6_sprintf(&ia->ia_addr.sin6_addr), 1077 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1078 return; 1079 } 1080 bzero(dp, sizeof(*dp)); 1081 callout_init(&dp->dad_timer_ch, 0); 1082 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1083 1084 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1085 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1086 1087 /* 1088 * Send NS packet for DAD, ip6_dad_count times. 1089 * Note that we must delay the first transmission, if this is the 1090 * first packet to be sent from the interface after interface 1091 * (re)initialization. 1092 */ 1093 dp->dad_ifa = ifa; 1094 IFAREF(ifa); /* just for safety */ 1095 dp->dad_count = ip6_dad_count; 1096 dp->dad_ns_icount = dp->dad_na_icount = 0; 1097 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1098 if (tick == NULL) { 1099 nd6_dad_ns_output(dp, ifa); 1100 nd6_dad_starttimer(dp, 1101 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1102 } else { 1103 int ntick; 1104 1105 if (*tick == 0) 1106 ntick = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1107 else 1108 ntick = *tick + arc4random() % (hz / 2); 1109 *tick = ntick; 1110 nd6_dad_starttimer(dp, ntick); 1111 } 1112 } 1113 1114 /* 1115 * terminate DAD unconditionally. used for address removals. 1116 */ 1117 void 1118 nd6_dad_stop(ifa) 1119 struct ifaddr *ifa; 1120 { 1121 struct dadq *dp; 1122 1123 if (!dad_init) 1124 return; 1125 dp = nd6_dad_find(ifa); 1126 if (!dp) { 1127 /* DAD wasn't started yet */ 1128 return; 1129 } 1130 1131 nd6_dad_stoptimer(dp); 1132 1133 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1134 free(dp, M_IP6NDP); 1135 dp = NULL; 1136 IFAFREE(ifa); 1137 } 1138 1139 static void 1140 nd6_dad_timer(ifa) 1141 struct ifaddr *ifa; 1142 { 1143 int s; 1144 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1145 struct dadq *dp; 1146 1147 s = splnet(); /* XXX */ 1148 1149 /* Sanity check */ 1150 if (ia == NULL) { 1151 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1152 goto done; 1153 } 1154 dp = nd6_dad_find(ifa); 1155 if (dp == NULL) { 1156 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1157 goto done; 1158 } 1159 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1160 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1161 "%s(%s)\n", 1162 ip6_sprintf(&ia->ia_addr.sin6_addr), 1163 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1164 goto done; 1165 } 1166 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1167 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1168 "%s(%s)\n", 1169 ip6_sprintf(&ia->ia_addr.sin6_addr), 1170 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1171 goto done; 1172 } 1173 1174 /* timeouted with IFF_{RUNNING,UP} check */ 1175 if (dp->dad_ns_tcount > dad_maxtry) { 1176 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1177 if_name(ifa->ifa_ifp))); 1178 1179 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1180 free(dp, M_IP6NDP); 1181 dp = NULL; 1182 IFAFREE(ifa); 1183 goto done; 1184 } 1185 1186 /* Need more checks? */ 1187 if (dp->dad_ns_ocount < dp->dad_count) { 1188 /* 1189 * We have more NS to go. Send NS packet for DAD. 1190 */ 1191 nd6_dad_ns_output(dp, ifa); 1192 nd6_dad_starttimer(dp, 1193 ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1194 } else { 1195 /* 1196 * We have transmitted sufficient number of DAD packets. 1197 * See what we've got. 1198 */ 1199 int duplicate; 1200 1201 duplicate = 0; 1202 1203 if (dp->dad_na_icount) { 1204 /* 1205 * the check is in nd6_dad_na_input(), 1206 * but just in case 1207 */ 1208 duplicate++; 1209 } 1210 1211 if (dp->dad_ns_icount) { 1212 #if 0 /* heuristics */ 1213 /* 1214 * if 1215 * - we have sent many(?) DAD NS, and 1216 * - the number of NS we sent equals to the 1217 * number of NS we've got, and 1218 * - we've got no NA 1219 * we may have a faulty network card/driver which 1220 * loops back multicasts to myself. 1221 */ 1222 if (3 < dp->dad_count 1223 && dp->dad_ns_icount == dp->dad_count 1224 && dp->dad_na_icount == 0) { 1225 log(LOG_INFO, "DAD questionable for %s(%s): " 1226 "network card loops back multicast?\n", 1227 ip6_sprintf(&ia->ia_addr.sin6_addr), 1228 if_name(ifa->ifa_ifp)); 1229 /* XXX consider it a duplicate or not? */ 1230 /* duplicate++; */ 1231 } else { 1232 /* We've seen NS, means DAD has failed. */ 1233 duplicate++; 1234 } 1235 #else 1236 /* We've seen NS, means DAD has failed. */ 1237 duplicate++; 1238 #endif 1239 } 1240 1241 if (duplicate) { 1242 /* (*dp) will be freed in nd6_dad_duplicated() */ 1243 dp = NULL; 1244 nd6_dad_duplicated(ifa); 1245 } else { 1246 /* 1247 * We are done with DAD. No NA came, no NS came. 1248 * duplicated address found. 1249 */ 1250 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1251 1252 nd6log((LOG_DEBUG, 1253 "%s: DAD complete for %s - no duplicates found\n", 1254 if_name(ifa->ifa_ifp), 1255 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1256 1257 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1258 free(dp, M_IP6NDP); 1259 dp = NULL; 1260 IFAFREE(ifa); 1261 } 1262 } 1263 1264 done: 1265 splx(s); 1266 } 1267 1268 void 1269 nd6_dad_duplicated(ifa) 1270 struct ifaddr *ifa; 1271 { 1272 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1273 struct dadq *dp; 1274 1275 dp = nd6_dad_find(ifa); 1276 if (dp == NULL) { 1277 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1278 return; 1279 } 1280 1281 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1282 "NS in/out=%d/%d, NA in=%d\n", 1283 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1284 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1285 1286 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1287 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1288 1289 /* We are done with DAD, with duplicated address found. (failure) */ 1290 nd6_dad_stoptimer(dp); 1291 1292 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1293 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1294 log(LOG_ERR, "%s: manual intervention required\n", 1295 if_name(ifa->ifa_ifp)); 1296 1297 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1298 free(dp, M_IP6NDP); 1299 dp = NULL; 1300 IFAFREE(ifa); 1301 } 1302 1303 static void 1304 nd6_dad_ns_output(dp, ifa) 1305 struct dadq *dp; 1306 struct ifaddr *ifa; 1307 { 1308 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1309 struct ifnet *ifp = ifa->ifa_ifp; 1310 1311 dp->dad_ns_tcount++; 1312 if ((ifp->if_flags & IFF_UP) == 0) { 1313 #if 0 1314 printf("%s: interface down?\n", if_name(ifp)); 1315 #endif 1316 return; 1317 } 1318 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) { 1319 #if 0 1320 printf("%s: interface not running?\n", if_name(ifp)); 1321 #endif 1322 return; 1323 } 1324 1325 dp->dad_ns_ocount++; 1326 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1327 } 1328 1329 static void 1330 nd6_dad_ns_input(ifa) 1331 struct ifaddr *ifa; 1332 { 1333 struct in6_ifaddr *ia; 1334 struct ifnet *ifp; 1335 const struct in6_addr *taddr6; 1336 struct dadq *dp; 1337 int duplicate; 1338 1339 if (!ifa) 1340 panic("ifa == NULL in nd6_dad_ns_input"); 1341 1342 ia = (struct in6_ifaddr *)ifa; 1343 ifp = ifa->ifa_ifp; 1344 taddr6 = &ia->ia_addr.sin6_addr; 1345 duplicate = 0; 1346 dp = nd6_dad_find(ifa); 1347 1348 /* Quickhack - completely ignore DAD NS packets */ 1349 if (dad_ignore_ns) { 1350 nd6log((LOG_INFO, 1351 "nd6_dad_ns_input: ignoring DAD NS packet for " 1352 "address %s(%s)\n", ip6_sprintf(taddr6), 1353 if_name(ifa->ifa_ifp))); 1354 return; 1355 } 1356 1357 /* 1358 * if I'm yet to start DAD, someone else started using this address 1359 * first. I have a duplicate and you win. 1360 */ 1361 if (!dp || dp->dad_ns_ocount == 0) 1362 duplicate++; 1363 1364 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1365 1366 if (duplicate) { 1367 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1368 nd6_dad_duplicated(ifa); 1369 } else { 1370 /* 1371 * not sure if I got a duplicate. 1372 * increment ns count and see what happens. 1373 */ 1374 if (dp) 1375 dp->dad_ns_icount++; 1376 } 1377 } 1378 1379 static void 1380 nd6_dad_na_input(ifa) 1381 struct ifaddr *ifa; 1382 { 1383 struct dadq *dp; 1384 1385 if (!ifa) 1386 panic("ifa == NULL in nd6_dad_na_input"); 1387 1388 dp = nd6_dad_find(ifa); 1389 if (dp) 1390 dp->dad_na_icount++; 1391 1392 /* remove the address. */ 1393 nd6_dad_duplicated(ifa); 1394 }
Cache object: 97f386ae233cd8276b3eac303448d30a
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