nd6_nbr.c revision 1.31
1 /* $NetBSD: nd6_nbr.c,v 1.31 2001/10/17 10:55:09 itojun Exp $ */ 2 /* $KAME: nd6_nbr.c,v 1.61 2001/02/10 16:06:14 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_starttimer __P((struct dadq *, int)); 74 static void nd6_dad_stoptimer __P((struct dadq *)); 75 static void nd6_dad_timer __P((struct ifaddr *)); 76 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 77 static void nd6_dad_ns_input __P((struct ifaddr *)); 78 static void nd6_dad_na_input __P((struct ifaddr *)); 79 80 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 81 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 82 83 /* 84 * Input an Neighbor Solicitation Message. 85 * 86 * Based on RFC 2461 87 * Based on RFC 2462 (duplicated address detection) 88 */ 89 void 90 nd6_ns_input(m, off, icmp6len) 91 struct mbuf *m; 92 int off, icmp6len; 93 { 94 struct ifnet *ifp = m->m_pkthdr.rcvif; 95 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 96 struct nd_neighbor_solicit *nd_ns; 97 struct in6_addr saddr6 = ip6->ip6_src; 98 struct in6_addr daddr6 = ip6->ip6_dst; 99 struct in6_addr taddr6; 100 struct in6_addr myaddr6; 101 char *lladdr = NULL; 102 struct ifaddr *ifa; 103 int lladdrlen = 0; 104 int anycast = 0, proxy = 0, tentative = 0; 105 int tlladdr; 106 union nd_opts ndopts; 107 struct sockaddr_dl *proxydl = NULL; 108 109 #ifndef PULLDOWN_TEST 110 IP6_EXTHDR_CHECK(m, off, icmp6len,); 111 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 112 #else 113 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 114 if (nd_ns == NULL) { 115 icmp6stat.icp6s_tooshort++; 116 return; 117 } 118 #endif 119 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 120 taddr6 = nd_ns->nd_ns_target; 121 122 if (ip6->ip6_hlim != 255) { 123 nd6log((LOG_ERR, 124 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 125 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 126 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 127 goto bad; 128 } 129 130 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 131 /* dst has to be solicited node multicast address. */ 132 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL 133 /* don't check ifindex portion */ 134 && daddr6.s6_addr32[1] == 0 135 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE 136 && daddr6.s6_addr8[12] == 0xff) { 137 ; /* good */ 138 } else { 139 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 140 "(wrong ip6 dst)\n")); 141 goto bad; 142 } 143 } 144 145 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 146 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 147 goto bad; 148 } 149 150 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 151 taddr6.s6_addr16[1] = htons(ifp->if_index); 152 153 icmp6len -= sizeof(*nd_ns); 154 nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 155 if (nd6_options(&ndopts) < 0) { 156 nd6log((LOG_INFO, 157 "nd6_ns_input: invalid ND option, ignored\n")); 158 /* nd6_options have incremented stats */ 159 goto freeit; 160 } 161 162 if (ndopts.nd_opts_src_lladdr) { 163 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 164 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 165 } 166 167 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 168 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 169 "(link-layer address option)\n")); 170 goto bad; 171 } 172 173 /* 174 * Attaching target link-layer address to the NA? 175 * (RFC 2461 7.2.4) 176 * 177 * NS IP dst is unicast/anycast MUST NOT add 178 * NS IP dst is solicited-node multicast MUST add 179 * 180 * In implementation, we add target link-layer address by default. 181 * We do not add one in MUST NOT cases. 182 */ 183 #if 0 /* too much! */ 184 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); 185 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) 186 tlladdr = 0; 187 else 188 #endif 189 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 190 tlladdr = 0; 191 else 192 tlladdr = 1; 193 194 /* 195 * Target address (taddr6) must be either: 196 * (1) Valid unicast/anycast address for my receiving interface, 197 * (2) Unicast address for which I'm offering proxy service, or 198 * (3) "tentative" address on which DAD is being performed. 199 */ 200 /* (1) and (3) check. */ 201 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 202 203 /* (2) check. */ 204 if (!ifa) { 205 struct rtentry *rt; 206 struct sockaddr_in6 tsin6; 207 208 bzero(&tsin6, sizeof tsin6); 209 tsin6.sin6_len = sizeof(struct sockaddr_in6); 210 tsin6.sin6_family = AF_INET6; 211 tsin6.sin6_addr = taddr6; 212 213 rt = rtalloc1((struct sockaddr *)&tsin6, 0); 214 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 215 rt->rt_gateway->sa_family == AF_LINK) { 216 /* 217 * proxy NDP for single entry 218 */ 219 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 220 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 221 if (ifa) { 222 proxy = 1; 223 proxydl = SDL(rt->rt_gateway); 224 } 225 } 226 if (rt) 227 rtfree(rt); 228 } 229 if (!ifa) { 230 /* 231 * We've got an NS packet, and we don't have that adddress 232 * assigned for us. We MUST silently ignore it. 233 * See RFC2461 7.2.3. 234 */ 235 goto freeit; 236 } 237 myaddr6 = *IFA_IN6(ifa); 238 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 239 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 240 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 241 goto freeit; 242 243 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 244 nd6log((LOG_INFO, 245 "nd6_ns_input: lladdrlen mismatch for %s " 246 "(if %d, NS packet %d)\n", 247 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 248 goto bad; 249 } 250 251 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 252 nd6log((LOG_INFO, 253 "nd6_ns_input: duplicate IP6 address %s\n", 254 ip6_sprintf(&saddr6))); 255 goto freeit; 256 } 257 258 /* 259 * We have neighbor solicitation packet, with target address equals to 260 * one of my tentative address. 261 * 262 * src addr how to process? 263 * --- --- 264 * multicast of course, invalid (rejected in ip6_input) 265 * unicast somebody is doing address resolution -> ignore 266 * unspec dup address detection 267 * 268 * The processing is defined in RFC 2462. 269 */ 270 if (tentative) { 271 /* 272 * If source address is unspecified address, it is for 273 * duplicated address detection. 274 * 275 * If not, the packet is for addess resolution; 276 * silently ignore it. 277 */ 278 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 279 nd6_dad_ns_input(ifa); 280 281 goto freeit; 282 } 283 284 /* 285 * If the source address is unspecified address, entries must not 286 * be created or updated. 287 * It looks that sender is performing DAD. Output NA toward 288 * all-node multicast address, to tell the sender that I'm using 289 * the address. 290 * S bit ("solicited") must be zero. 291 */ 292 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 293 saddr6 = in6addr_linklocal_allnodes; 294 saddr6.s6_addr16[1] = htons(ifp->if_index); 295 nd6_na_output(ifp, &saddr6, &taddr6, 296 ((anycast || proxy || !tlladdr) 297 ? 0 : ND_NA_FLAG_OVERRIDE) 298 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 299 tlladdr, (struct sockaddr *)proxydl); 300 goto freeit; 301 } 302 303 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 304 305 nd6_na_output(ifp, &saddr6, &taddr6, 306 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) 307 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) 308 | ND_NA_FLAG_SOLICITED, 309 tlladdr, (struct sockaddr *)proxydl); 310 freeit: 311 m_freem(m); 312 return; 313 314 bad: 315 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 316 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 317 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 318 icmp6stat.icp6s_badns++; 319 m_freem(m); 320 } 321 322 /* 323 * Output an Neighbor Solicitation Message. Caller specifies: 324 * - ICMP6 header source IP6 address 325 * - ND6 header target IP6 address 326 * - ND6 header source datalink address 327 * 328 * Based on RFC 2461 329 * Based on RFC 2462 (duplicated address detection) 330 */ 331 void 332 nd6_ns_output(ifp, daddr6, taddr6, ln, dad) 333 struct ifnet *ifp; 334 struct in6_addr *daddr6, *taddr6; 335 struct llinfo_nd6 *ln; /* for source address determination */ 336 int dad; /* duplicated address detection */ 337 { 338 struct mbuf *m; 339 struct ip6_hdr *ip6; 340 struct nd_neighbor_solicit *nd_ns; 341 struct in6_ifaddr *ia = NULL; 342 struct ip6_moptions im6o; 343 int icmp6len; 344 int maxlen; 345 caddr_t mac; 346 struct ifnet *outif = NULL; 347 348 if (IN6_IS_ADDR_MULTICAST(taddr6)) 349 return; 350 351 /* estimate the size of message */ 352 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 353 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 354 #ifdef DIAGNOSTIC 355 if (max_linkhdr + maxlen >= MCLBYTES) { 356 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 357 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 358 panic("nd6_ns_output: insufficient MCLBYTES"); 359 /* NOTREACHED */ 360 } 361 #endif 362 363 MGETHDR(m, M_DONTWAIT, MT_DATA); 364 if (m && max_linkhdr + maxlen >= MHLEN) { 365 MCLGET(m, M_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 /* 406 * RFC2461 7.2.2: 407 * "If the source address of the packet prompting the 408 * solicitation is the same as one of the addresses assigned 409 * to the outgoing interface, that address SHOULD be placed 410 * in the IP Source Address of the outgoing solicitation. 411 * Otherwise, any one of the addresses assigned to the 412 * interface should be used." 413 * 414 * We use the source address for the prompting packet 415 * (saddr6), if: 416 * - saddr6 is given from the caller (by giving "ln"), and 417 * - saddr6 belongs to the outgoing interface. 418 * Otherwise, we perform a scope-wise match. 419 */ 420 struct ip6_hdr *hip6; /* hold ip6 */ 421 struct in6_addr *saddr6; 422 423 if (ln && ln->ln_hold) { 424 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 425 /* XXX pullup? */ 426 if (sizeof(*hip6) < ln->ln_hold->m_len) 427 saddr6 = &hip6->ip6_src; 428 else 429 saddr6 = NULL; 430 } else 431 saddr6 = NULL; 432 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 433 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 434 else { 435 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 436 if (ia == NULL) { 437 m_freem(m); 438 return; 439 } 440 ip6->ip6_src = ia->ia_addr.sin6_addr; 441 } 442 } else { 443 /* 444 * Source address for DAD packet must always be IPv6 445 * unspecified address. (0::0) 446 */ 447 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 448 } 449 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 450 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 451 nd_ns->nd_ns_code = 0; 452 nd_ns->nd_ns_reserved = 0; 453 nd_ns->nd_ns_target = *taddr6; 454 455 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target)) 456 nd_ns->nd_ns_target.s6_addr16[1] = 0; 457 458 /* 459 * Add source link-layer address option. 460 * 461 * spec implementation 462 * --- --- 463 * DAD packet MUST NOT do not add the option 464 * there's no link layer address: 465 * impossible do not add the option 466 * there's link layer address: 467 * Multicast NS MUST add one add the option 468 * Unicast NS SHOULD add one add the option 469 */ 470 if (!dad && (mac = nd6_ifptomac(ifp))) { 471 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 472 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 473 /* 8 byte alignments... */ 474 optlen = (optlen + 7) & ~7; 475 476 m->m_pkthdr.len += optlen; 477 m->m_len += optlen; 478 icmp6len += optlen; 479 bzero((caddr_t)nd_opt, optlen); 480 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 481 nd_opt->nd_opt_len = optlen >> 3; 482 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 483 } 484 485 ip6->ip6_plen = htons((u_short)icmp6len); 486 nd_ns->nd_ns_cksum = 0; 487 nd_ns->nd_ns_cksum 488 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 489 490 #ifdef IPSEC 491 /* Don't lookup socket */ 492 (void)ipsec_setsocket(m, NULL); 493 #endif 494 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif); 495 if (outif) { 496 icmp6_ifstat_inc(outif, ifs6_out_msg); 497 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); 498 } 499 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 500 } 501 502 /* 503 * Neighbor advertisement input handling. 504 * 505 * Based on RFC 2461 506 * Based on RFC 2462 (duplicated address detection) 507 * 508 * the following items are not implemented yet: 509 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 510 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 511 */ 512 void 513 nd6_na_input(m, off, icmp6len) 514 struct mbuf *m; 515 int off, icmp6len; 516 { 517 struct ifnet *ifp = m->m_pkthdr.rcvif; 518 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 519 struct nd_neighbor_advert *nd_na; 520 #if 0 521 struct in6_addr saddr6 = ip6->ip6_src; 522 #endif 523 struct in6_addr daddr6 = ip6->ip6_dst; 524 struct in6_addr taddr6; 525 int flags; 526 int is_router; 527 int is_solicited; 528 int is_override; 529 char *lladdr = NULL; 530 int lladdrlen = 0; 531 struct ifaddr *ifa; 532 struct llinfo_nd6 *ln; 533 struct rtentry *rt; 534 struct sockaddr_dl *sdl; 535 union nd_opts ndopts; 536 long time_second = time.tv_sec; 537 538 if (ip6->ip6_hlim != 255) { 539 nd6log((LOG_ERR, 540 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 541 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 542 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 543 goto bad; 544 } 545 546 #ifndef PULLDOWN_TEST 547 IP6_EXTHDR_CHECK(m, off, icmp6len,); 548 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 549 #else 550 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 551 if (nd_na == NULL) { 552 icmp6stat.icp6s_tooshort++; 553 return; 554 } 555 #endif 556 taddr6 = nd_na->nd_na_target; 557 flags = nd_na->nd_na_flags_reserved; 558 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 559 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 560 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 561 562 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 563 taddr6.s6_addr16[1] = htons(ifp->if_index); 564 565 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 566 nd6log((LOG_ERR, 567 "nd6_na_input: invalid target address %s\n", 568 ip6_sprintf(&taddr6))); 569 goto bad; 570 } 571 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 572 if (is_solicited) { 573 nd6log((LOG_ERR, 574 "nd6_na_input: a solicited adv is multicasted\n")); 575 goto bad; 576 } 577 578 icmp6len -= sizeof(*nd_na); 579 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 580 if (nd6_options(&ndopts) < 0) { 581 nd6log((LOG_INFO, 582 "nd6_na_input: invalid ND option, ignored\n")); 583 /* nd6_options have incremented stats */ 584 goto freeit; 585 } 586 587 if (ndopts.nd_opts_tgt_lladdr) { 588 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 589 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 590 } 591 592 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 593 594 /* 595 * Target address matches one of my interface address. 596 * 597 * If my address is tentative, this means that there's somebody 598 * already using the same address as mine. This indicates DAD failure. 599 * This is defined in RFC 2462. 600 * 601 * Otherwise, process as defined in RFC 2461. 602 */ 603 if (ifa 604 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 605 nd6_dad_na_input(ifa); 606 goto freeit; 607 } 608 609 /* Just for safety, maybe unnecessary. */ 610 if (ifa) { 611 log(LOG_ERR, 612 "nd6_na_input: duplicate IP6 address %s\n", 613 ip6_sprintf(&taddr6)); 614 goto freeit; 615 } 616 617 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 618 nd6log((LOG_INFO, 619 "nd6_na_input: lladdrlen mismatch for %s " 620 "(if %d, NA packet %d)\n", 621 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 622 goto bad; 623 } 624 625 /* 626 * If no neighbor cache entry is found, NA SHOULD silently be discarded. 627 */ 628 rt = nd6_lookup(&taddr6, 0, ifp); 629 if ((rt == NULL) || 630 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 631 ((sdl = SDL(rt->rt_gateway)) == NULL)) 632 goto freeit; 633 634 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 635 /* 636 * If the link-layer has address, and no lladdr option came, 637 * discard the packet. 638 */ 639 if (ifp->if_addrlen && !lladdr) 640 goto freeit; 641 642 /* 643 * Record link-layer address, and update the state. 644 */ 645 sdl->sdl_alen = ifp->if_addrlen; 646 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 647 if (is_solicited) { 648 ln->ln_state = ND6_LLINFO_REACHABLE; 649 ln->ln_byhint = 0; 650 if (ln->ln_expire) 651 ln->ln_expire = time_second + 652 nd_ifinfo[rt->rt_ifp->if_index].reachable; 653 } else { 654 ln->ln_state = ND6_LLINFO_STALE; 655 ln->ln_expire = time_second + nd6_gctimer; 656 } 657 if ((ln->ln_router = is_router) != 0) { 658 /* 659 * This means a router's state has changed from 660 * non-reachable to probably reachable, and might 661 * affect the status of associated prefixes.. 662 */ 663 pfxlist_onlink_check(); 664 } 665 } else { 666 int llchange; 667 668 /* 669 * Check if the link-layer address has changed or not. 670 */ 671 if (!lladdr) 672 llchange = 0; 673 else { 674 if (sdl->sdl_alen) { 675 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 676 llchange = 1; 677 else 678 llchange = 0; 679 } else 680 llchange = 1; 681 } 682 683 /* 684 * This is VERY complex. Look at it with care. 685 * 686 * override solicit lladdr llchange action 687 * (L: record lladdr) 688 * 689 * 0 0 n -- (2c) 690 * 0 0 y n (2b) L 691 * 0 0 y y (1) REACHABLE->STALE 692 * 0 1 n -- (2c) *->REACHABLE 693 * 0 1 y n (2b) L *->REACHABLE 694 * 0 1 y y (1) REACHABLE->STALE 695 * 1 0 n -- (2a) 696 * 1 0 y n (2a) L 697 * 1 0 y y (2a) L *->STALE 698 * 1 1 n -- (2a) *->REACHABLE 699 * 1 1 y n (2a) L *->REACHABLE 700 * 1 1 y y (2a) L *->REACHABLE 701 */ 702 if (!is_override && (lladdr && llchange)) { /* (1) */ 703 /* 704 * If state is REACHABLE, make it STALE. 705 * no other updates should be done. 706 */ 707 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 708 ln->ln_state = ND6_LLINFO_STALE; 709 ln->ln_expire = time_second + nd6_gctimer; 710 } 711 goto freeit; 712 } else if (is_override /* (2a) */ 713 || (!is_override && (lladdr && !llchange)) /* (2b) */ 714 || !lladdr) { /* (2c) */ 715 /* 716 * Update link-local address, if any. 717 */ 718 if (lladdr) { 719 sdl->sdl_alen = ifp->if_addrlen; 720 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 721 } 722 723 /* 724 * If solicited, make the state REACHABLE. 725 * If not solicited and the link-layer address was 726 * changed, make it STALE. 727 */ 728 if (is_solicited) { 729 ln->ln_state = ND6_LLINFO_REACHABLE; 730 ln->ln_byhint = 0; 731 if (ln->ln_expire) { 732 ln->ln_expire = time_second + 733 nd_ifinfo[ifp->if_index].reachable; 734 } 735 } else { 736 if (lladdr && llchange) { 737 ln->ln_state = ND6_LLINFO_STALE; 738 ln->ln_expire = time_second + nd6_gctimer; 739 } 740 } 741 } 742 743 if (ln->ln_router && !is_router) { 744 /* 745 * The peer dropped the router flag. 746 * Remove the sender from the Default Router List and 747 * update the Destination Cache entries. 748 */ 749 struct nd_defrouter *dr; 750 struct in6_addr *in6; 751 int s; 752 753 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 754 755 /* 756 * Lock to protect the default router list. 757 * XXX: this might be unnecessary, since this function 758 * is only called under the network software interrupt 759 * context. However, we keep it just for safety. 760 */ 761 s = splsoftnet(); 762 dr = defrouter_lookup(in6, rt->rt_ifp); 763 if (dr) 764 defrtrlist_del(dr); 765 else if (!ip6_forwarding && ip6_accept_rtadv) { 766 /* 767 * Even if the neighbor is not in the default 768 * router list, the neighbor may be used 769 * as a next hop for some destinations 770 * (e.g. redirect case). So we must 771 * call rt6_flush explicitly. 772 */ 773 rt6_flush(&ip6->ip6_src, rt->rt_ifp); 774 } 775 splx(s); 776 } 777 ln->ln_router = is_router; 778 } 779 rt->rt_flags &= ~RTF_REJECT; 780 ln->ln_asked = 0; 781 if (ln->ln_hold) { 782 /* 783 * we assume ifp is not a p2p here, so just set the 2nd 784 * argument as the 1st one. 785 */ 786 nd6_output(ifp, ifp, ln->ln_hold, 787 (struct sockaddr_in6 *)rt_key(rt), rt); 788 ln->ln_hold = 0; 789 } 790 791 freeit: 792 m_freem(m); 793 return; 794 795 bad: 796 icmp6stat.icp6s_badna++; 797 m_freem(m); 798 } 799 800 /* 801 * Neighbor advertisement output handling. 802 * 803 * Based on RFC 2461 804 * 805 * the following items are not implemented yet: 806 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 807 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 808 */ 809 void 810 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 811 struct ifnet *ifp; 812 struct in6_addr *daddr6, *taddr6; 813 u_long flags; 814 int tlladdr; /* 1 if include target link-layer address */ 815 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 816 { 817 struct mbuf *m; 818 struct ip6_hdr *ip6; 819 struct nd_neighbor_advert *nd_na; 820 struct in6_ifaddr *ia = NULL; 821 struct ip6_moptions im6o; 822 int icmp6len; 823 int maxlen; 824 caddr_t mac; 825 struct ifnet *outif = NULL; 826 827 /* estimate the size of message */ 828 maxlen = sizeof(*ip6) + sizeof(*nd_na); 829 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 830 #ifdef DIAGNOSTIC 831 if (max_linkhdr + maxlen >= MCLBYTES) { 832 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 833 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 834 panic("nd6_na_output: insufficient MCLBYTES"); 835 /* NOTREACHED */ 836 } 837 #endif 838 839 MGETHDR(m, M_DONTWAIT, MT_DATA); 840 if (m && max_linkhdr + maxlen >= MHLEN) { 841 MCLGET(m, M_DONTWAIT); 842 if ((m->m_flags & M_EXT) == 0) { 843 m_free(m); 844 m = NULL; 845 } 846 } 847 if (m == NULL) 848 return; 849 m->m_pkthdr.rcvif = NULL; 850 851 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 852 m->m_flags |= M_MCAST; 853 im6o.im6o_multicast_ifp = ifp; 854 im6o.im6o_multicast_hlim = 255; 855 im6o.im6o_multicast_loop = 0; 856 } 857 858 icmp6len = sizeof(*nd_na); 859 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 860 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 861 862 /* fill neighbor advertisement packet */ 863 ip6 = mtod(m, struct ip6_hdr *); 864 ip6->ip6_flow = 0; 865 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 866 ip6->ip6_vfc |= IPV6_VERSION; 867 ip6->ip6_nxt = IPPROTO_ICMPV6; 868 ip6->ip6_hlim = 255; 869 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 870 /* reply to DAD */ 871 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 872 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 873 ip6->ip6_dst.s6_addr32[1] = 0; 874 ip6->ip6_dst.s6_addr32[2] = 0; 875 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 876 flags &= ~ND_NA_FLAG_SOLICITED; 877 } else 878 ip6->ip6_dst = *daddr6; 879 880 /* 881 * Select a source whose scope is the same as that of the dest. 882 */ 883 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 884 if (ia == NULL) { 885 m_freem(m); 886 return; 887 } 888 ip6->ip6_src = ia->ia_addr.sin6_addr; 889 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 890 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 891 nd_na->nd_na_code = 0; 892 nd_na->nd_na_target = *taddr6; 893 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target)) 894 nd_na->nd_na_target.s6_addr16[1] = 0; 895 896 /* 897 * "tlladdr" indicates NS's condition for adding tlladdr or not. 898 * see nd6_ns_input() for details. 899 * Basically, if NS packet is sent to unicast/anycast addr, 900 * target lladdr option SHOULD NOT be included. 901 */ 902 if (tlladdr) { 903 mac = NULL; 904 /* 905 * sdl0 != NULL indicates proxy NA. If we do proxy, use 906 * lladdr in sdl0. If we are not proxying (sending NA for 907 * my address) use lladdr configured for the interface. 908 */ 909 if (sdl0 == NULL) 910 mac = nd6_ifptomac(ifp); 911 else if (sdl0->sa_family == AF_LINK) { 912 struct sockaddr_dl *sdl; 913 sdl = (struct sockaddr_dl *)sdl0; 914 if (sdl->sdl_alen == ifp->if_addrlen) 915 mac = LLADDR(sdl); 916 } 917 } 918 if (tlladdr && mac) { 919 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 920 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 921 922 /* roundup to 8 bytes alignment! */ 923 optlen = (optlen + 7) & ~7; 924 925 m->m_pkthdr.len += optlen; 926 m->m_len += optlen; 927 icmp6len += optlen; 928 bzero((caddr_t)nd_opt, optlen); 929 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 930 nd_opt->nd_opt_len = optlen >> 3; 931 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 932 } else 933 flags &= ~ND_NA_FLAG_OVERRIDE; 934 935 ip6->ip6_plen = htons((u_short)icmp6len); 936 nd_na->nd_na_flags_reserved = flags; 937 nd_na->nd_na_cksum = 0; 938 nd_na->nd_na_cksum = 939 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 940 941 #ifdef IPSEC 942 /* Don't lookup socket */ 943 (void)ipsec_setsocket(m, NULL); 944 #endif 945 ip6_output(m, NULL, NULL, 0, &im6o, &outif); 946 if (outif) { 947 icmp6_ifstat_inc(outif, ifs6_out_msg); 948 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); 949 } 950 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 951 } 952 953 caddr_t 954 nd6_ifptomac(ifp) 955 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 return LLADDR(ifp->if_sadl); 963 break; 964 default: 965 return NULL; 966 } 967 } 968 969 TAILQ_HEAD(dadq_head, dadq); 970 struct dadq { 971 TAILQ_ENTRY(dadq) dad_list; 972 struct ifaddr *dad_ifa; 973 int dad_count; /* max NS to send */ 974 int dad_ns_tcount; /* # of trials to send NS */ 975 int dad_ns_ocount; /* NS sent so far */ 976 int dad_ns_icount; 977 int dad_na_icount; 978 struct callout dad_timer_ch; 979 }; 980 981 static struct dadq_head dadq; 982 static int dad_init = 0; 983 984 static struct dadq * 985 nd6_dad_find(ifa) 986 struct ifaddr *ifa; 987 { 988 struct dadq *dp; 989 990 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 991 if (dp->dad_ifa == ifa) 992 return dp; 993 } 994 return NULL; 995 } 996 997 static void 998 nd6_dad_starttimer(dp, ticks) 999 struct dadq *dp; 1000 int ticks; 1001 { 1002 1003 callout_reset(&dp->dad_timer_ch, ticks, 1004 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 1005 } 1006 1007 static void 1008 nd6_dad_stoptimer(dp) 1009 struct dadq *dp; 1010 { 1011 1012 callout_stop(&dp->dad_timer_ch); 1013 } 1014 1015 /* 1016 * Start Duplicated Address Detection (DAD) for specified interface address. 1017 */ 1018 void 1019 nd6_dad_start(ifa, tick) 1020 struct ifaddr *ifa; 1021 int *tick; /* minimum delay ticks for IFF_UP event */ 1022 { 1023 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1024 struct dadq *dp; 1025 1026 if (!dad_init) { 1027 TAILQ_INIT(&dadq); 1028 dad_init++; 1029 } 1030 1031 /* 1032 * If we don't need DAD, don't do it. 1033 * There are several cases: 1034 * - DAD is disabled (ip6_dad_count == 0) 1035 * - the interface address is anycast 1036 */ 1037 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1038 log(LOG_DEBUG, 1039 "nd6_dad_start: called with non-tentative address " 1040 "%s(%s)\n", 1041 ip6_sprintf(&ia->ia_addr.sin6_addr), 1042 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1043 return; 1044 } 1045 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1046 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1047 return; 1048 } 1049 if (!ip6_dad_count) { 1050 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1051 return; 1052 } 1053 if (!ifa->ifa_ifp) 1054 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1055 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1056 return; 1057 if (nd6_dad_find(ifa) != NULL) { 1058 /* DAD already in progress */ 1059 return; 1060 } 1061 1062 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1063 if (dp == NULL) { 1064 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1065 "%s(%s)\n", 1066 ip6_sprintf(&ia->ia_addr.sin6_addr), 1067 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1068 return; 1069 } 1070 bzero(dp, sizeof(*dp)); 1071 callout_init(&dp->dad_timer_ch); 1072 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1073 1074 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1075 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1076 1077 /* 1078 * Send NS packet for DAD, ip6_dad_count times. 1079 * Note that we must delay the first transmission, if this is the 1080 * first packet to be sent from the interface after interface 1081 * (re)initialization. 1082 */ 1083 dp->dad_ifa = ifa; 1084 IFAREF(ifa); /* just for safety */ 1085 dp->dad_count = ip6_dad_count; 1086 dp->dad_ns_icount = dp->dad_na_icount = 0; 1087 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1088 if (tick == NULL) { 1089 nd6_dad_ns_output(dp, ifa); 1090 nd6_dad_starttimer(dp, 1091 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1092 } else { 1093 int ntick; 1094 1095 if (*tick == 0) 1096 ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1097 else 1098 ntick = *tick + random() % (hz / 2); 1099 *tick = ntick; 1100 nd6_dad_starttimer(dp, ntick); 1101 } 1102 } 1103 1104 /* 1105 * terminate DAD unconditionally. used for address removals. 1106 */ 1107 void 1108 nd6_dad_stop(ifa) 1109 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(ifa) 1131 struct ifaddr *ifa; 1132 { 1133 int s; 1134 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1135 struct dadq *dp; 1136 1137 s = splsoftnet(); /* XXX */ 1138 1139 /* Sanity check */ 1140 if (ia == NULL) { 1141 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1142 goto done; 1143 } 1144 dp = nd6_dad_find(ifa); 1145 if (dp == NULL) { 1146 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1147 goto done; 1148 } 1149 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1150 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1151 "%s(%s)\n", 1152 ip6_sprintf(&ia->ia_addr.sin6_addr), 1153 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1154 goto done; 1155 } 1156 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1157 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1158 "%s(%s)\n", 1159 ip6_sprintf(&ia->ia_addr.sin6_addr), 1160 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1161 goto done; 1162 } 1163 1164 /* timeouted with IFF_{RUNNING,UP} check */ 1165 if (dp->dad_ns_tcount > dad_maxtry) { 1166 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1167 if_name(ifa->ifa_ifp))); 1168 1169 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1170 free(dp, M_IP6NDP); 1171 dp = NULL; 1172 IFAFREE(ifa); 1173 goto done; 1174 } 1175 1176 /* Need more checks? */ 1177 if (dp->dad_ns_ocount < dp->dad_count) { 1178 /* 1179 * We have more NS to go. Send NS packet for DAD. 1180 */ 1181 nd6_dad_ns_output(dp, ifa); 1182 nd6_dad_starttimer(dp, 1183 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1184 } else { 1185 /* 1186 * We have transmitted sufficient number of DAD packets. 1187 * See what we've got. 1188 */ 1189 int duplicate; 1190 1191 duplicate = 0; 1192 1193 if (dp->dad_na_icount) { 1194 /* 1195 * the check is in nd6_dad_na_input(), 1196 * but just in case 1197 */ 1198 duplicate++; 1199 } 1200 1201 if (dp->dad_ns_icount) { 1202 #if 0 /* heuristics */ 1203 /* 1204 * if 1205 * - we have sent many(?) DAD NS, and 1206 * - the number of NS we sent equals to the 1207 * number of NS we've got, and 1208 * - we've got no NA 1209 * we may have a faulty network card/driver which 1210 * loops back multicasts to myself. 1211 */ 1212 if (3 < dp->dad_count 1213 && dp->dad_ns_icount == dp->dad_count 1214 && dp->dad_na_icount == 0) { 1215 log(LOG_INFO, "DAD questionable for %s(%s): " 1216 "network card loops back multicast?\n", 1217 ip6_sprintf(&ia->ia_addr.sin6_addr), 1218 if_name(ifa->ifa_ifp)); 1219 /* XXX consider it a duplicate or not? */ 1220 /* duplicate++; */ 1221 } else { 1222 /* We've seen NS, means DAD has failed. */ 1223 duplicate++; 1224 } 1225 #else 1226 /* We've seen NS, means DAD has failed. */ 1227 duplicate++; 1228 #endif 1229 } 1230 1231 if (duplicate) { 1232 /* (*dp) will be freed in nd6_dad_duplicated() */ 1233 dp = NULL; 1234 nd6_dad_duplicated(ifa); 1235 } else { 1236 /* 1237 * We are done with DAD. No NA came, no NS came. 1238 * duplicated address found. 1239 */ 1240 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1241 1242 nd6log((LOG_DEBUG, 1243 "%s: DAD complete for %s - no duplicates found\n", 1244 if_name(ifa->ifa_ifp), 1245 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1246 1247 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1248 free(dp, M_IP6NDP); 1249 dp = NULL; 1250 IFAFREE(ifa); 1251 } 1252 } 1253 1254 done: 1255 splx(s); 1256 } 1257 1258 void 1259 nd6_dad_duplicated(ifa) 1260 struct ifaddr *ifa; 1261 { 1262 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1263 struct dadq *dp; 1264 1265 dp = nd6_dad_find(ifa); 1266 if (dp == NULL) { 1267 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1268 return; 1269 } 1270 1271 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1272 "NS in/out=%d/%d, NA in=%d\n", 1273 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1274 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1275 1276 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1277 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1278 1279 /* We are done with DAD, with duplicated address found. (failure) */ 1280 nd6_dad_stoptimer(dp); 1281 1282 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1283 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1284 log(LOG_ERR, "%s: manual intervention required\n", 1285 if_name(ifa->ifa_ifp)); 1286 1287 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1288 free(dp, M_IP6NDP); 1289 dp = NULL; 1290 IFAFREE(ifa); 1291 } 1292 1293 static void 1294 nd6_dad_ns_output(dp, ifa) 1295 struct dadq *dp; 1296 struct ifaddr *ifa; 1297 { 1298 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1299 struct ifnet *ifp = ifa->ifa_ifp; 1300 1301 dp->dad_ns_tcount++; 1302 if ((ifp->if_flags & IFF_UP) == 0) { 1303 #if 0 1304 printf("%s: interface down?\n", if_name(ifp)); 1305 #endif 1306 return; 1307 } 1308 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1309 #if 0 1310 printf("%s: interface not running?\n", if_name(ifp)); 1311 #endif 1312 return; 1313 } 1314 1315 dp->dad_ns_ocount++; 1316 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1317 } 1318 1319 static void 1320 nd6_dad_ns_input(ifa) 1321 struct ifaddr *ifa; 1322 { 1323 struct in6_ifaddr *ia; 1324 struct ifnet *ifp; 1325 struct in6_addr *taddr6; 1326 struct dadq *dp; 1327 int duplicate; 1328 1329 if (!ifa) 1330 panic("ifa == NULL in nd6_dad_ns_input"); 1331 1332 ia = (struct in6_ifaddr *)ifa; 1333 ifp = ifa->ifa_ifp; 1334 taddr6 = &ia->ia_addr.sin6_addr; 1335 duplicate = 0; 1336 dp = nd6_dad_find(ifa); 1337 1338 /* Quickhack - completely ignore DAD NS packets */ 1339 if (dad_ignore_ns) { 1340 nd6log((LOG_INFO, 1341 "nd6_dad_ns_input: ignoring DAD NS packet for " 1342 "address %s(%s)\n", ip6_sprintf(taddr6), 1343 if_name(ifa->ifa_ifp))); 1344 return; 1345 } 1346 1347 /* 1348 * if I'm yet to start DAD, someone else started using this address 1349 * first. I have a duplicate and you win. 1350 */ 1351 if (!dp || dp->dad_ns_ocount == 0) 1352 duplicate++; 1353 1354 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1355 1356 if (duplicate) { 1357 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1358 nd6_dad_duplicated(ifa); 1359 } else { 1360 /* 1361 * not sure if I got a duplicate. 1362 * increment ns count and see what happens. 1363 */ 1364 if (dp) 1365 dp->dad_ns_icount++; 1366 } 1367 } 1368 1369 static void 1370 nd6_dad_na_input(ifa) 1371 struct ifaddr *ifa; 1372 { 1373 struct dadq *dp; 1374 1375 if (!ifa) 1376 panic("ifa == NULL in nd6_dad_na_input"); 1377 1378 dp = nd6_dad_find(ifa); 1379 if (dp) 1380 dp->dad_na_icount++; 1381 1382 /* remove the address. */ 1383 nd6_dad_duplicated(ifa); 1384 } 1385
Indexes created Mon Sep 29 21:09:56 GMT 2025