1 /* $NetBSD: nd6_nbr.c,v 1.35 2002/05/28 10:11:51 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 <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: nd6_nbr.c,v 1.35 2002/05/28 10:11:51 itojun Exp $"); 35 36 #include "opt_inet.h" 37 #include "opt_ipsec.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/sockio.h> 45 #include <sys/time.h> 46 #include <sys/kernel.h> 47 #include <sys/errno.h> 48 #include <sys/ioctl.h> 49 #include <sys/syslog.h> 50 #include <sys/queue.h> 51 #include <sys/callout.h> 52 53 #include <net/if.h> 54 #include <net/if_types.h> 55 #include <net/if_dl.h> 56 #include <net/route.h> 57 58 #include <netinet/in.h> 59 #include <netinet/in_var.h> 60 #include <netinet6/in6_var.h> 61 #include <netinet/ip6.h> 62 #include <netinet6/ip6_var.h> 63 #include <netinet6/nd6.h> 64 #include <netinet/icmp6.h> 65 66 #ifdef IPSEC 67 #include <netinet6/ipsec.h> 68 #endif 69 70 #include <net/net_osdep.h> 71 72 #define SDL(s) ((struct sockaddr_dl *)s) 73 74 struct dadq; 75 static struct dadq *nd6_dad_find __P((struct ifaddr *)); 76 static void nd6_dad_starttimer __P((struct dadq *, int)); 77 static void nd6_dad_stoptimer __P((struct dadq *)); 78 static void nd6_dad_timer __P((struct ifaddr *)); 79 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 80 static void nd6_dad_ns_input __P((struct ifaddr *)); 81 static void nd6_dad_na_input __P((struct ifaddr *)); 82 83 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 84 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 85 86 /* 87 * Input an Neighbor Solicitation Message. 88 * 89 * Based on RFC 2461 90 * Based on RFC 2462 (duplicated address detection) 91 */ 92 void 93 nd6_ns_input(m, off, icmp6len) 94 struct mbuf *m; 95 int off, icmp6len; 96 { 97 struct ifnet *ifp = m->m_pkthdr.rcvif; 98 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 99 struct nd_neighbor_solicit *nd_ns; 100 struct in6_addr saddr6 = ip6->ip6_src; 101 struct in6_addr daddr6 = ip6->ip6_dst; 102 struct in6_addr taddr6; 103 struct in6_addr myaddr6; 104 char *lladdr = NULL; 105 struct ifaddr *ifa; 106 int lladdrlen = 0; 107 int anycast = 0, proxy = 0, tentative = 0; 108 int tlladdr; 109 union nd_opts ndopts; 110 struct sockaddr_dl *proxydl = NULL; 111 112 #ifndef PULLDOWN_TEST 113 IP6_EXTHDR_CHECK(m, off, icmp6len,); 114 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 115 #else 116 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 117 if (nd_ns == NULL) { 118 icmp6stat.icp6s_tooshort++; 119 return; 120 } 121 #endif 122 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 123 taddr6 = nd_ns->nd_ns_target; 124 125 if (ip6->ip6_hlim != 255) { 126 nd6log((LOG_ERR, 127 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 128 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 129 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 130 goto bad; 131 } 132 133 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 134 /* dst has to be solicited node multicast address. */ 135 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL 136 /* don't check ifindex portion */ 137 && daddr6.s6_addr32[1] == 0 138 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE 139 && daddr6.s6_addr8[12] == 0xff) { 140 ; /* good */ 141 } else { 142 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 143 "(wrong ip6 dst)\n")); 144 goto bad; 145 } 146 } 147 148 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 149 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 150 goto bad; 151 } 152 153 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 154 taddr6.s6_addr16[1] = htons(ifp->if_index); 155 156 icmp6len -= sizeof(*nd_ns); 157 nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 158 if (nd6_options(&ndopts) < 0) { 159 nd6log((LOG_INFO, 160 "nd6_ns_input: invalid ND option, ignored\n")); 161 /* nd6_options have incremented stats */ 162 goto freeit; 163 } 164 165 if (ndopts.nd_opts_src_lladdr) { 166 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 167 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 168 } 169 170 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 171 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 172 "(link-layer address option)\n")); 173 goto bad; 174 } 175 176 /* 177 * Attaching target link-layer address to the NA? 178 * (RFC 2461 7.2.4) 179 * 180 * NS IP dst is unicast/anycast MUST NOT add 181 * NS IP dst is solicited-node multicast MUST add 182 * 183 * In implementation, we add target link-layer address by default. 184 * We do not add one in MUST NOT cases. 185 */ 186 #if 0 /* too much! */ 187 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); 188 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) 189 tlladdr = 0; 190 else 191 #endif 192 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 193 tlladdr = 0; 194 else 195 tlladdr = 1; 196 197 /* 198 * Target address (taddr6) must be either: 199 * (1) Valid unicast/anycast address for my receiving interface, 200 * (2) Unicast address for which I'm offering proxy service, or 201 * (3) "tentative" address on which DAD is being performed. 202 */ 203 /* (1) and (3) check. */ 204 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 205 206 /* (2) check. */ 207 if (!ifa) { 208 struct rtentry *rt; 209 struct sockaddr_in6 tsin6; 210 211 bzero(&tsin6, sizeof tsin6); 212 tsin6.sin6_len = sizeof(struct sockaddr_in6); 213 tsin6.sin6_family = AF_INET6; 214 tsin6.sin6_addr = taddr6; 215 216 rt = rtalloc1((struct sockaddr *)&tsin6, 0); 217 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 218 rt->rt_gateway->sa_family == AF_LINK) { 219 /* 220 * proxy NDP for single entry 221 */ 222 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 223 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 224 if (ifa) { 225 proxy = 1; 226 proxydl = SDL(rt->rt_gateway); 227 } 228 } 229 if (rt) 230 rtfree(rt); 231 } 232 if (!ifa) { 233 /* 234 * We've got an NS packet, and we don't have that adddress 235 * assigned for us. We MUST silently ignore it. 236 * See RFC2461 7.2.3. 237 */ 238 goto freeit; 239 } 240 myaddr6 = *IFA_IN6(ifa); 241 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 242 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 243 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 244 goto freeit; 245 246 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 247 nd6log((LOG_INFO, 248 "nd6_ns_input: lladdrlen mismatch for %s " 249 "(if %d, NS packet %d)\n", 250 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 251 goto bad; 252 } 253 254 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 255 nd6log((LOG_INFO, 256 "nd6_ns_input: duplicate IP6 address %s\n", 257 ip6_sprintf(&saddr6))); 258 goto freeit; 259 } 260 261 /* 262 * We have neighbor solicitation packet, with target address equals to 263 * one of my tentative address. 264 * 265 * src addr how to process? 266 * --- --- 267 * multicast of course, invalid (rejected in ip6_input) 268 * unicast somebody is doing address resolution -> ignore 269 * unspec dup address detection 270 * 271 * The processing is defined in RFC 2462. 272 */ 273 if (tentative) { 274 /* 275 * If source address is unspecified address, it is for 276 * duplicated address detection. 277 * 278 * If not, the packet is for addess resolution; 279 * silently ignore it. 280 */ 281 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 282 nd6_dad_ns_input(ifa); 283 284 goto freeit; 285 } 286 287 /* 288 * If the source address is unspecified address, entries must not 289 * be created or updated. 290 * It looks that sender is performing DAD. Output NA toward 291 * all-node multicast address, to tell the sender that I'm using 292 * the address. 293 * S bit ("solicited") must be zero. 294 */ 295 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 296 saddr6 = in6addr_linklocal_allnodes; 297 saddr6.s6_addr16[1] = htons(ifp->if_index); 298 nd6_na_output(ifp, &saddr6, &taddr6, 299 ((anycast || proxy || !tlladdr) 300 ? 0 : ND_NA_FLAG_OVERRIDE) 301 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 302 tlladdr, (struct sockaddr *)proxydl); 303 goto freeit; 304 } 305 306 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 307 308 nd6_na_output(ifp, &saddr6, &taddr6, 309 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) 310 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) 311 | ND_NA_FLAG_SOLICITED, 312 tlladdr, (struct sockaddr *)proxydl); 313 freeit: 314 m_freem(m); 315 return; 316 317 bad: 318 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 319 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 320 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 321 icmp6stat.icp6s_badns++; 322 m_freem(m); 323 } 324 325 /* 326 * Output an Neighbor Solicitation Message. Caller specifies: 327 * - ICMP6 header source IP6 address 328 * - ND6 header target IP6 address 329 * - ND6 header source datalink address 330 * 331 * Based on RFC 2461 332 * Based on RFC 2462 (duplicated address detection) 333 */ 334 void 335 nd6_ns_output(ifp, daddr6, taddr6, ln, dad) 336 struct ifnet *ifp; 337 const struct in6_addr *daddr6, *taddr6; 338 struct llinfo_nd6 *ln; /* for source address determination */ 339 int dad; /* duplicated address detection */ 340 { 341 struct mbuf *m; 342 struct ip6_hdr *ip6; 343 struct nd_neighbor_solicit *nd_ns; 344 struct in6_ifaddr *ia = NULL; 345 struct ip6_moptions im6o; 346 int icmp6len; 347 int maxlen; 348 caddr_t mac; 349 350 if (IN6_IS_ADDR_MULTICAST(taddr6)) 351 return; 352 353 /* estimate the size of message */ 354 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 355 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 356 #ifdef DIAGNOSTIC 357 if (max_linkhdr + maxlen >= MCLBYTES) { 358 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 359 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 360 panic("nd6_ns_output: insufficient MCLBYTES"); 361 /* NOTREACHED */ 362 } 363 #endif 364 365 MGETHDR(m, M_DONTWAIT, MT_DATA); 366 if (m && max_linkhdr + maxlen >= MHLEN) { 367 MCLGET(m, M_DONTWAIT); 368 if ((m->m_flags & M_EXT) == 0) { 369 m_free(m); 370 m = NULL; 371 } 372 } 373 if (m == NULL) 374 return; 375 m->m_pkthdr.rcvif = NULL; 376 377 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 378 m->m_flags |= M_MCAST; 379 im6o.im6o_multicast_ifp = ifp; 380 im6o.im6o_multicast_hlim = 255; 381 im6o.im6o_multicast_loop = 0; 382 } 383 384 icmp6len = sizeof(*nd_ns); 385 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 386 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 387 388 /* fill neighbor solicitation packet */ 389 ip6 = mtod(m, struct ip6_hdr *); 390 ip6->ip6_flow = 0; 391 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 392 ip6->ip6_vfc |= IPV6_VERSION; 393 /* ip6->ip6_plen will be set later */ 394 ip6->ip6_nxt = IPPROTO_ICMPV6; 395 ip6->ip6_hlim = 255; 396 if (daddr6) 397 ip6->ip6_dst = *daddr6; 398 else { 399 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 400 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 401 ip6->ip6_dst.s6_addr32[1] = 0; 402 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 403 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 404 ip6->ip6_dst.s6_addr8[12] = 0xff; 405 } 406 if (!dad) { 407 /* 408 * RFC2461 7.2.2: 409 * "If the source address of the packet prompting the 410 * solicitation is the same as one of the addresses assigned 411 * to the outgoing interface, that address SHOULD be placed 412 * in the IP Source Address of the outgoing solicitation. 413 * Otherwise, any one of the addresses assigned to the 414 * interface should be used." 415 * 416 * We use the source address for the prompting packet 417 * (saddr6), if: 418 * - saddr6 is given from the caller (by giving "ln"), and 419 * - saddr6 belongs to the outgoing interface. 420 * Otherwise, we perform a scope-wise match. 421 */ 422 struct ip6_hdr *hip6; /* hold ip6 */ 423 struct in6_addr *saddr6; 424 425 if (ln && ln->ln_hold) { 426 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 427 /* XXX pullup? */ 428 if (sizeof(*hip6) < ln->ln_hold->m_len) 429 saddr6 = &hip6->ip6_src; 430 else 431 saddr6 = NULL; 432 } else 433 saddr6 = NULL; 434 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 435 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 436 else { 437 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 438 if (ia == NULL) { 439 m_freem(m); 440 return; 441 } 442 ip6->ip6_src = ia->ia_addr.sin6_addr; 443 } 444 } else { 445 /* 446 * Source address for DAD packet must always be IPv6 447 * unspecified address. (0::0) 448 */ 449 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 450 } 451 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 452 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 453 nd_ns->nd_ns_code = 0; 454 nd_ns->nd_ns_reserved = 0; 455 nd_ns->nd_ns_target = *taddr6; 456 457 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target)) 458 nd_ns->nd_ns_target.s6_addr16[1] = 0; 459 460 /* 461 * Add source link-layer address option. 462 * 463 * spec implementation 464 * --- --- 465 * DAD packet MUST NOT do not add the option 466 * there's no link layer address: 467 * impossible do not add the option 468 * there's link layer address: 469 * Multicast NS MUST add one add the option 470 * Unicast NS SHOULD add one add the option 471 */ 472 if (!dad && (mac = nd6_ifptomac(ifp))) { 473 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 474 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 475 /* 8 byte alignments... */ 476 optlen = (optlen + 7) & ~7; 477 478 m->m_pkthdr.len += optlen; 479 m->m_len += optlen; 480 icmp6len += optlen; 481 bzero((caddr_t)nd_opt, optlen); 482 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 483 nd_opt->nd_opt_len = optlen >> 3; 484 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 485 } 486 487 ip6->ip6_plen = htons((u_short)icmp6len); 488 nd_ns->nd_ns_cksum = 0; 489 nd_ns->nd_ns_cksum 490 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 491 492 #ifdef IPSEC 493 /* Don't lookup socket */ 494 (void)ipsec_setsocket(m, NULL); 495 #endif 496 ip6_output(m, NULL, NULL, 0, &im6o, NULL); 497 icmp6_ifstat_inc(ifp, ifs6_out_msg); 498 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 499 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 500 501 return; 502 503 #if 0 504 bad: 505 m_freem(m); 506 return; 507 #endif 508 } 509 510 /* 511 * Neighbor advertisement input handling. 512 * 513 * Based on RFC 2461 514 * Based on RFC 2462 (duplicated address detection) 515 * 516 * the following items are not implemented yet: 517 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 518 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 519 */ 520 void 521 nd6_na_input(m, off, icmp6len) 522 struct mbuf *m; 523 int off, icmp6len; 524 { 525 struct ifnet *ifp = m->m_pkthdr.rcvif; 526 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 527 struct nd_neighbor_advert *nd_na; 528 #if 0 529 struct in6_addr saddr6 = ip6->ip6_src; 530 #endif 531 struct in6_addr daddr6 = ip6->ip6_dst; 532 struct in6_addr taddr6; 533 int flags; 534 int is_router; 535 int is_solicited; 536 int is_override; 537 char *lladdr = NULL; 538 int lladdrlen = 0; 539 struct ifaddr *ifa; 540 struct llinfo_nd6 *ln; 541 struct rtentry *rt; 542 struct sockaddr_dl *sdl; 543 union nd_opts ndopts; 544 long time_second = time.tv_sec; 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 = splsoftnet(); 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 p2p 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 = NULL; 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(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 819 struct ifnet *ifp; 820 const struct in6_addr *daddr6, *taddr6; 821 u_long flags; 822 int tlladdr; /* 1 if include target link-layer address */ 823 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 824 { 825 struct mbuf *m; 826 struct ip6_hdr *ip6; 827 struct nd_neighbor_advert *nd_na; 828 struct in6_ifaddr *ia = NULL; 829 struct ip6_moptions im6o; 830 int icmp6len; 831 int maxlen; 832 caddr_t mac; 833 834 /* estimate the size of message */ 835 maxlen = sizeof(*ip6) + sizeof(*nd_na); 836 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 837 #ifdef DIAGNOSTIC 838 if (max_linkhdr + maxlen >= MCLBYTES) { 839 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 840 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 841 panic("nd6_na_output: insufficient MCLBYTES"); 842 /* NOTREACHED */ 843 } 844 #endif 845 846 MGETHDR(m, M_DONTWAIT, MT_DATA); 847 if (m && max_linkhdr + maxlen >= MHLEN) { 848 MCLGET(m, M_DONTWAIT); 849 if ((m->m_flags & M_EXT) == 0) { 850 m_free(m); 851 m = NULL; 852 } 853 } 854 if (m == NULL) 855 return; 856 m->m_pkthdr.rcvif = NULL; 857 858 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 859 m->m_flags |= M_MCAST; 860 im6o.im6o_multicast_ifp = ifp; 861 im6o.im6o_multicast_hlim = 255; 862 im6o.im6o_multicast_loop = 0; 863 } 864 865 icmp6len = sizeof(*nd_na); 866 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 867 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 868 869 /* fill neighbor advertisement packet */ 870 ip6 = mtod(m, struct ip6_hdr *); 871 ip6->ip6_flow = 0; 872 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 873 ip6->ip6_vfc |= IPV6_VERSION; 874 ip6->ip6_nxt = IPPROTO_ICMPV6; 875 ip6->ip6_hlim = 255; 876 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 877 /* reply to DAD */ 878 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 879 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 880 ip6->ip6_dst.s6_addr32[1] = 0; 881 ip6->ip6_dst.s6_addr32[2] = 0; 882 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 883 flags &= ~ND_NA_FLAG_SOLICITED; 884 } else 885 ip6->ip6_dst = *daddr6; 886 887 /* 888 * Select a source whose scope is the same as that of the dest. 889 */ 890 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 891 if (ia == NULL) { 892 m_freem(m); 893 return; 894 } 895 ip6->ip6_src = ia->ia_addr.sin6_addr; 896 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 897 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 898 nd_na->nd_na_code = 0; 899 nd_na->nd_na_target = *taddr6; 900 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target)) 901 nd_na->nd_na_target.s6_addr16[1] = 0; 902 903 /* 904 * "tlladdr" indicates NS's condition for adding tlladdr or not. 905 * see nd6_ns_input() for details. 906 * Basically, if NS packet is sent to unicast/anycast addr, 907 * target lladdr option SHOULD NOT be included. 908 */ 909 if (tlladdr) { 910 mac = NULL; 911 /* 912 * sdl0 != NULL indicates proxy NA. If we do proxy, use 913 * lladdr in sdl0. If we are not proxying (sending NA for 914 * my address) use lladdr configured for the interface. 915 */ 916 if (sdl0 == NULL) 917 mac = nd6_ifptomac(ifp); 918 else if (sdl0->sa_family == AF_LINK) { 919 struct sockaddr_dl *sdl; 920 sdl = (struct sockaddr_dl *)sdl0; 921 if (sdl->sdl_alen == ifp->if_addrlen) 922 mac = LLADDR(sdl); 923 } 924 } 925 if (tlladdr && mac) { 926 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 927 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 928 929 /* roundup to 8 bytes alignment! */ 930 optlen = (optlen + 7) & ~7; 931 932 m->m_pkthdr.len += optlen; 933 m->m_len += optlen; 934 icmp6len += optlen; 935 bzero((caddr_t)nd_opt, optlen); 936 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 937 nd_opt->nd_opt_len = optlen >> 3; 938 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 939 } else 940 flags &= ~ND_NA_FLAG_OVERRIDE; 941 942 ip6->ip6_plen = htons((u_short)icmp6len); 943 nd_na->nd_na_flags_reserved = flags; 944 nd_na->nd_na_cksum = 0; 945 nd_na->nd_na_cksum = 946 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 947 948 #ifdef IPSEC 949 /* Don't lookup socket */ 950 (void)ipsec_setsocket(m, NULL); 951 #endif 952 ip6_output(m, NULL, NULL, 0, &im6o, NULL); 953 954 icmp6_ifstat_inc(ifp, ifs6_out_msg); 955 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 956 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 957 } 958 959 caddr_t 960 nd6_ifptomac(ifp) 961 struct ifnet *ifp; 962 { 963 switch (ifp->if_type) { 964 case IFT_ARCNET: 965 case IFT_ETHER: 966 case IFT_FDDI: 967 case IFT_IEEE1394: 968 return LLADDR(ifp->if_sadl); 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(ifa) 992 struct ifaddr *ifa; 993 { 994 struct dadq *dp; 995 996 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 997 if (dp->dad_ifa == ifa) 998 return dp; 999 } 1000 return NULL; 1001 } 1002 1003 static void 1004 nd6_dad_starttimer(dp, ticks) 1005 struct dadq *dp; 1006 int ticks; 1007 { 1008 1009 callout_reset(&dp->dad_timer_ch, ticks, 1010 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 1011 } 1012 1013 static void 1014 nd6_dad_stoptimer(dp) 1015 struct dadq *dp; 1016 { 1017 1018 callout_stop(&dp->dad_timer_ch); 1019 } 1020 1021 /* 1022 * Start Duplicated Address Detection (DAD) for specified interface address. 1023 */ 1024 void 1025 nd6_dad_start(ifa, tick) 1026 struct ifaddr *ifa; 1027 int *tick; /* minimum delay ticks for IFF_UP event */ 1028 { 1029 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1030 struct dadq *dp; 1031 1032 if (!dad_init) { 1033 TAILQ_INIT(&dadq); 1034 dad_init++; 1035 } 1036 1037 /* 1038 * If we don't need DAD, don't do it. 1039 * There are several cases: 1040 * - DAD is disabled (ip6_dad_count == 0) 1041 * - the interface address is anycast 1042 */ 1043 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1044 log(LOG_DEBUG, 1045 "nd6_dad_start: called with non-tentative address " 1046 "%s(%s)\n", 1047 ip6_sprintf(&ia->ia_addr.sin6_addr), 1048 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1049 return; 1050 } 1051 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1052 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1053 return; 1054 } 1055 if (!ip6_dad_count) { 1056 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1057 return; 1058 } 1059 if (!ifa->ifa_ifp) 1060 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1061 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1062 return; 1063 if (nd6_dad_find(ifa) != NULL) { 1064 /* DAD already in progress */ 1065 return; 1066 } 1067 1068 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1069 if (dp == NULL) { 1070 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1071 "%s(%s)\n", 1072 ip6_sprintf(&ia->ia_addr.sin6_addr), 1073 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1074 return; 1075 } 1076 bzero(dp, sizeof(*dp)); 1077 callout_init(&dp->dad_timer_ch); 1078 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1079 1080 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1081 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1082 1083 /* 1084 * Send NS packet for DAD, ip6_dad_count times. 1085 * Note that we must delay the first transmission, if this is the 1086 * first packet to be sent from the interface after interface 1087 * (re)initialization. 1088 */ 1089 dp->dad_ifa = ifa; 1090 IFAREF(ifa); /* just for safety */ 1091 dp->dad_count = ip6_dad_count; 1092 dp->dad_ns_icount = dp->dad_na_icount = 0; 1093 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1094 if (tick == NULL) { 1095 nd6_dad_ns_output(dp, ifa); 1096 nd6_dad_starttimer(dp, 1097 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1098 } else { 1099 int ntick; 1100 1101 if (*tick == 0) 1102 ntick = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1103 else 1104 ntick = *tick + arc4random() % (hz / 2); 1105 *tick = ntick; 1106 nd6_dad_starttimer(dp, ntick); 1107 } 1108 } 1109 1110 /* 1111 * terminate DAD unconditionally. used for address removals. 1112 */ 1113 void 1114 nd6_dad_stop(ifa) 1115 struct ifaddr *ifa; 1116 { 1117 struct dadq *dp; 1118 1119 if (!dad_init) 1120 return; 1121 dp = nd6_dad_find(ifa); 1122 if (!dp) { 1123 /* DAD wasn't started yet */ 1124 return; 1125 } 1126 1127 nd6_dad_stoptimer(dp); 1128 1129 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1130 free(dp, M_IP6NDP); 1131 dp = NULL; 1132 IFAFREE(ifa); 1133 } 1134 1135 static void 1136 nd6_dad_timer(ifa) 1137 struct ifaddr *ifa; 1138 { 1139 int s; 1140 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1141 struct dadq *dp; 1142 1143 s = splsoftnet(); /* XXX */ 1144 1145 /* Sanity check */ 1146 if (ia == NULL) { 1147 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1148 goto done; 1149 } 1150 dp = nd6_dad_find(ifa); 1151 if (dp == NULL) { 1152 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1153 goto done; 1154 } 1155 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1156 log(LOG_ERR, "nd6_dad_timer: called with duplicated 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 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1163 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1164 "%s(%s)\n", 1165 ip6_sprintf(&ia->ia_addr.sin6_addr), 1166 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1167 goto done; 1168 } 1169 1170 /* timeouted with IFF_{RUNNING,UP} check */ 1171 if (dp->dad_ns_tcount > dad_maxtry) { 1172 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1173 if_name(ifa->ifa_ifp))); 1174 1175 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1176 free(dp, M_IP6NDP); 1177 dp = NULL; 1178 IFAFREE(ifa); 1179 goto done; 1180 } 1181 1182 /* Need more checks? */ 1183 if (dp->dad_ns_ocount < dp->dad_count) { 1184 /* 1185 * We have more NS to go. Send NS packet for DAD. 1186 */ 1187 nd6_dad_ns_output(dp, ifa); 1188 nd6_dad_starttimer(dp, 1189 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1190 } else { 1191 /* 1192 * We have transmitted sufficient number of DAD packets. 1193 * See what we've got. 1194 */ 1195 int duplicate; 1196 1197 duplicate = 0; 1198 1199 if (dp->dad_na_icount) { 1200 /* 1201 * the check is in nd6_dad_na_input(), 1202 * but just in case 1203 */ 1204 duplicate++; 1205 } 1206 1207 if (dp->dad_ns_icount) { 1208 #if 0 /* heuristics */ 1209 /* 1210 * if 1211 * - we have sent many(?) DAD NS, and 1212 * - the number of NS we sent equals to the 1213 * number of NS we've got, and 1214 * - we've got no NA 1215 * we may have a faulty network card/driver which 1216 * loops back multicasts to myself. 1217 */ 1218 if (3 < dp->dad_count 1219 && dp->dad_ns_icount == dp->dad_count 1220 && dp->dad_na_icount == 0) { 1221 log(LOG_INFO, "DAD questionable for %s(%s): " 1222 "network card loops back multicast?\n", 1223 ip6_sprintf(&ia->ia_addr.sin6_addr), 1224 if_name(ifa->ifa_ifp)); 1225 /* XXX consider it a duplicate or not? */ 1226 /* duplicate++; */ 1227 } else { 1228 /* We've seen NS, means DAD has failed. */ 1229 duplicate++; 1230 } 1231 #else 1232 /* We've seen NS, means DAD has failed. */ 1233 duplicate++; 1234 #endif 1235 } 1236 1237 if (duplicate) { 1238 /* (*dp) will be freed in nd6_dad_duplicated() */ 1239 dp = NULL; 1240 nd6_dad_duplicated(ifa); 1241 } else { 1242 /* 1243 * We are done with DAD. No NA came, no NS came. 1244 * duplicated address found. 1245 */ 1246 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1247 1248 nd6log((LOG_DEBUG, 1249 "%s: DAD complete for %s - no duplicates found\n", 1250 if_name(ifa->ifa_ifp), 1251 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1252 1253 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1254 free(dp, M_IP6NDP); 1255 dp = NULL; 1256 IFAFREE(ifa); 1257 } 1258 } 1259 1260 done: 1261 splx(s); 1262 } 1263 1264 void 1265 nd6_dad_duplicated(ifa) 1266 struct ifaddr *ifa; 1267 { 1268 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1269 struct dadq *dp; 1270 1271 dp = nd6_dad_find(ifa); 1272 if (dp == NULL) { 1273 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1274 return; 1275 } 1276 1277 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1278 "NS in/out=%d/%d, NA in=%d\n", 1279 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1280 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1281 1282 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1283 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1284 1285 /* We are done with DAD, with duplicated address found. (failure) */ 1286 nd6_dad_stoptimer(dp); 1287 1288 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1289 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1290 log(LOG_ERR, "%s: manual intervention required\n", 1291 if_name(ifa->ifa_ifp)); 1292 1293 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1294 free(dp, M_IP6NDP); 1295 dp = NULL; 1296 IFAFREE(ifa); 1297 } 1298 1299 static void 1300 nd6_dad_ns_output(dp, ifa) 1301 struct dadq *dp; 1302 struct ifaddr *ifa; 1303 { 1304 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1305 struct ifnet *ifp = ifa->ifa_ifp; 1306 1307 dp->dad_ns_tcount++; 1308 if ((ifp->if_flags & IFF_UP) == 0) { 1309 #if 0 1310 printf("%s: interface down?\n", if_name(ifp)); 1311 #endif 1312 return; 1313 } 1314 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1315 #if 0 1316 printf("%s: interface not running?\n", if_name(ifp)); 1317 #endif 1318 return; 1319 } 1320 1321 dp->dad_ns_ocount++; 1322 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1323 } 1324 1325 static void 1326 nd6_dad_ns_input(ifa) 1327 struct ifaddr *ifa; 1328 { 1329 struct in6_ifaddr *ia; 1330 struct ifnet *ifp; 1331 const struct in6_addr *taddr6; 1332 struct dadq *dp; 1333 int duplicate; 1334 1335 if (!ifa) 1336 panic("ifa == NULL in nd6_dad_ns_input"); 1337 1338 ia = (struct in6_ifaddr *)ifa; 1339 ifp = ifa->ifa_ifp; 1340 taddr6 = &ia->ia_addr.sin6_addr; 1341 duplicate = 0; 1342 dp = nd6_dad_find(ifa); 1343 1344 /* Quickhack - completely ignore DAD NS packets */ 1345 if (dad_ignore_ns) { 1346 nd6log((LOG_INFO, 1347 "nd6_dad_ns_input: ignoring DAD NS packet for " 1348 "address %s(%s)\n", ip6_sprintf(taddr6), 1349 if_name(ifa->ifa_ifp))); 1350 return; 1351 } 1352 1353 /* 1354 * if I'm yet to start DAD, someone else started using this address 1355 * first. I have a duplicate and you win. 1356 */ 1357 if (!dp || dp->dad_ns_ocount == 0) 1358 duplicate++; 1359 1360 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1361 1362 if (duplicate) { 1363 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1364 nd6_dad_duplicated(ifa); 1365 } else { 1366 /* 1367 * not sure if I got a duplicate. 1368 * increment ns count and see what happens. 1369 */ 1370 if (dp) 1371 dp->dad_ns_icount++; 1372 } 1373 } 1374 1375 static void 1376 nd6_dad_na_input(ifa) 1377 struct ifaddr *ifa; 1378 { 1379 struct dadq *dp; 1380 1381 if (!ifa) 1382 panic("ifa == NULL in nd6_dad_na_input"); 1383 1384 dp = nd6_dad_find(ifa); 1385 if (dp) 1386 dp->dad_na_icount++; 1387 1388 /* remove the address. */ 1389 nd6_dad_duplicated(ifa); 1390 } 1391