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sys/bsd/netinet6/nd6_nbr.c
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1 /* $FreeBSD: src/sys/netinet6/nd6_nbr.c,v 1.4.2.4 2001/07/06 05:32:25 sumikawa Exp $ */ 2 /* $KAME: nd6_nbr.c,v 1.64 2001/05/17 03:48:30 itojun 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/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/socket.h> 38 #include <sys/sockio.h> 39 #include <sys/time.h> 40 #include <sys/kernel.h> 41 #include <sys/errno.h> 42 #include <sys/syslog.h> 43 #include <kern/queue.h> 44 45 #include <net/if.h> 46 #include <net/if_types.h> 47 #include <net/if_dl.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_var.h> 52 #include <netinet6/in6_var.h> 53 #include <netinet/ip6.h> 54 #include <netinet6/ip6_var.h> 55 #include <netinet6/nd6.h> 56 #include <netinet/icmp6.h> 57 58 #if IPSEC 59 #include <netinet6/ipsec.h> 60 #if INET6 61 #include <netinet6/ipsec6.h> 62 #endif 63 extern int ipsec_bypass; 64 #endif 65 66 #include <net/net_osdep.h> 67 68 #define SDL(s) ((struct sockaddr_dl *)s) 69 70 struct dadq; 71 static struct dadq *nd6_dad_find __P((struct ifaddr *)); 72 #ifndef __APPLE__ 73 static void nd6_dad_starttimer __P((struct dadq *, int)); 74 static void nd6_dad_stoptimer __P((struct dadq *)); 75 #else 76 void nd6_dad_stoptimer __P((struct ifaddr *)); 77 #endif 78 static void nd6_dad_timer __P((struct ifaddr *)); 79 static void nd6_dad_timer_funnel __P((struct ifaddr *)); 80 static void nd6_dad_ns_output __P((struct dadq *, struct ifaddr *)); 81 static void nd6_dad_ns_input __P((struct ifaddr *)); 82 static void nd6_dad_na_input __P((struct ifaddr *)); 83 84 static int dad_ignore_ns = 0; /* ignore NS in DAD - specwise incorrect*/ 85 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 86 87 /* 88 * Input an Neighbor Solicitation Message. 89 * 90 * Based on RFC 2461 91 * Based on RFC 2462 (duplicated address detection) 92 */ 93 void 94 nd6_ns_input(m, off, icmp6len) 95 struct mbuf *m; 96 int off, icmp6len; 97 { 98 struct ifnet *ifp = m->m_pkthdr.rcvif; 99 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 100 struct nd_neighbor_solicit *nd_ns; 101 struct in6_addr saddr6 = ip6->ip6_src; 102 struct in6_addr daddr6 = ip6->ip6_dst; 103 struct in6_addr taddr6; 104 struct in6_addr myaddr6; 105 char *lladdr = NULL; 106 struct ifaddr *ifa; 107 int lladdrlen = 0; 108 int anycast = 0, proxy = 0, tentative = 0; 109 int tlladdr; 110 union nd_opts ndopts; 111 struct sockaddr_dl *proxydl = NULL; 112 113 #ifndef PULLDOWN_TEST 114 IP6_EXTHDR_CHECK(m, off, icmp6len,); 115 nd_ns = (struct nd_neighbor_solicit *)((caddr_t)ip6 + off); 116 #else 117 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 118 if (nd_ns == NULL) { 119 icmp6stat.icp6s_tooshort++; 120 return; 121 } 122 #endif 123 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 124 taddr6 = nd_ns->nd_ns_target; 125 126 if (ip6->ip6_hlim != 255) { 127 nd6log((LOG_ERR, 128 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 129 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 130 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 131 goto bad; 132 } 133 134 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 135 /* dst has to be solicited node multicast address. */ 136 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL 137 /* don't check ifindex portion */ 138 && daddr6.s6_addr32[1] == 0 139 && daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE 140 && daddr6.s6_addr8[12] == 0xff) { 141 ; /* good */ 142 } else { 143 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 144 "(wrong ip6 dst)\n")); 145 goto bad; 146 } 147 } 148 149 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 150 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 151 goto bad; 152 } 153 154 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 155 taddr6.s6_addr16[1] = htons(ifp->if_index); 156 157 icmp6len -= sizeof(*nd_ns); 158 nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 159 if (nd6_options(&ndopts) < 0) { 160 nd6log((LOG_INFO, 161 "nd6_ns_input: invalid ND option, ignored\n")); 162 /* nd6_options have incremented stats */ 163 goto freeit; 164 } 165 166 if (ndopts.nd_opts_src_lladdr) { 167 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 168 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 169 } 170 171 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 172 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 173 "(link-layer address option)\n")); 174 goto bad; 175 } 176 177 /* 178 * Attaching target link-layer address to the NA? 179 * (RFC 2461 7.2.4) 180 * 181 * NS IP dst is unicast/anycast MUST NOT add 182 * NS IP dst is solicited-node multicast MUST add 183 * 184 * In implementation, we add target link-layer address by default. 185 * We do not add one in MUST NOT cases. 186 */ 187 #if 0 /* too much! */ 188 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); 189 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) 190 tlladdr = 0; 191 else 192 #endif 193 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 194 tlladdr = 0; 195 else 196 tlladdr = 1; 197 198 /* 199 * Target address (taddr6) must be either: 200 * (1) Valid unicast/anycast address for my receiving interface, 201 * (2) Unicast address for which I'm offering proxy service, or 202 * (3) "tentative" address on which DAD is being performed. 203 */ 204 /* (1) and (3) check. */ 205 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 206 207 /* (2) check. */ 208 if (!ifa) { 209 struct rtentry *rt; 210 struct sockaddr_in6 tsin6; 211 212 bzero(&tsin6, sizeof tsin6); 213 tsin6.sin6_len = sizeof(struct sockaddr_in6); 214 tsin6.sin6_family = AF_INET6; 215 tsin6.sin6_addr = taddr6; 216 217 rt = rtalloc1((struct sockaddr *)&tsin6, 0, 0); 218 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 219 rt->rt_gateway->sa_family == AF_LINK) { 220 /* 221 * proxy NDP for single entry 222 */ 223 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 224 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 225 if (ifa) { 226 proxy = 1; 227 proxydl = SDL(rt->rt_gateway); 228 } 229 } 230 if (rt) 231 rtfree(rt); 232 } 233 if (!ifa) { 234 /* 235 * We've got an NS packet, and we don't have that adddress 236 * assigned for us. We MUST silently ignore it. 237 * See RFC2461 7.2.3. 238 */ 239 goto freeit; 240 } 241 myaddr6 = *IFA_IN6(ifa); 242 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 243 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 244 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 245 goto freeit; 246 247 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 248 nd6log((LOG_INFO, 249 "nd6_ns_input: lladdrlen mismatch for %s " 250 "(if %d, NS packet %d)\n", 251 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 252 goto bad; 253 } 254 255 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 256 nd6log((LOG_INFO, 257 "nd6_ns_input: duplicate IP6 address %s\n", 258 ip6_sprintf(&saddr6))); 259 goto freeit; 260 } 261 262 /* 263 * We have neighbor solicitation packet, with target address equals to 264 * one of my tentative address. 265 * 266 * src addr how to process? 267 * --- --- 268 * multicast of course, invalid (rejected in ip6_input) 269 * unicast somebody is doing address resolution -> ignore 270 * unspec dup address detection 271 * 272 * The processing is defined in RFC 2462. 273 */ 274 if (tentative) { 275 /* 276 * If source address is unspecified address, it is for 277 * duplicated address detection. 278 * 279 * If not, the packet is for addess resolution; 280 * silently ignore it. 281 */ 282 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 283 nd6_dad_ns_input(ifa); 284 285 goto freeit; 286 } 287 288 /* 289 * If the source address is unspecified address, entries must not 290 * be created or updated. 291 * It looks that sender is performing DAD. Output NA toward 292 * all-node multicast address, to tell the sender that I'm using 293 * the address. 294 * S bit ("solicited") must be zero. 295 */ 296 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 297 saddr6 = in6addr_linklocal_allnodes; 298 saddr6.s6_addr16[1] = htons(ifp->if_index); 299 nd6_na_output(ifp, &saddr6, &taddr6, 300 ((anycast || proxy || !tlladdr) 301 ? 0 : ND_NA_FLAG_OVERRIDE) 302 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0), 303 tlladdr, (struct sockaddr *)proxydl); 304 goto freeit; 305 } 306 307 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 308 309 nd6_na_output(ifp, &saddr6, &taddr6, 310 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) 311 | (ip6_forwarding ? ND_NA_FLAG_ROUTER : 0) 312 | ND_NA_FLAG_SOLICITED, 313 tlladdr, (struct sockaddr *)proxydl); 314 freeit: 315 m_freem(m); 316 return; 317 318 bad: 319 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 320 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 321 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 322 icmp6stat.icp6s_badns++; 323 m_freem(m); 324 } 325 326 /* 327 * Output an Neighbor Solicitation Message. Caller specifies: 328 * - ICMP6 header source IP6 address 329 * - ND6 header target IP6 address 330 * - ND6 header source datalink address 331 * 332 * Based on RFC 2461 333 * Based on RFC 2462 (duplicated address detection) 334 */ 335 void 336 nd6_ns_output(ifp, daddr6, taddr6, ln, dad) 337 struct ifnet *ifp; 338 const struct in6_addr *daddr6, *taddr6; 339 struct llinfo_nd6 *ln; /* for source address determination */ 340 int dad; /* duplicated address detection */ 341 { 342 struct mbuf *m; 343 struct ip6_hdr *ip6; 344 struct nd_neighbor_solicit *nd_ns; 345 struct in6_ifaddr *ia = NULL; 346 struct ip6_moptions im6o; 347 int icmp6len; 348 int maxlen; 349 caddr_t mac; 350 struct ifnet *outif = NULL; 351 352 if (IN6_IS_ADDR_MULTICAST(taddr6)) 353 return; 354 355 /* estimate the size of message */ 356 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 357 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 358 if (max_linkhdr + maxlen >= MCLBYTES) { 359 #if DIAGNOSTIC 360 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 361 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 362 #endif 363 return; 364 } 365 366 MGETHDR(m, M_DONTWAIT, MT_DATA); 367 if (m && max_linkhdr + maxlen >= MHLEN) { 368 MCLGET(m, M_DONTWAIT); 369 if ((m->m_flags & M_EXT) == 0) { 370 m_free(m); 371 m = NULL; 372 } 373 } 374 if (m == NULL) 375 return; 376 m->m_pkthdr.rcvif = NULL; 377 378 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 379 m->m_flags |= M_MCAST; 380 im6o.im6o_multicast_ifp = ifp; 381 im6o.im6o_multicast_hlim = 255; 382 im6o.im6o_multicast_loop = 0; 383 } 384 385 icmp6len = sizeof(*nd_ns); 386 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 387 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 388 389 /* fill neighbor solicitation packet */ 390 ip6 = mtod(m, struct ip6_hdr *); 391 ip6->ip6_flow = 0; 392 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 393 ip6->ip6_vfc |= IPV6_VERSION; 394 /* ip6->ip6_plen will be set later */ 395 ip6->ip6_nxt = IPPROTO_ICMPV6; 396 ip6->ip6_hlim = 255; 397 if (daddr6) 398 ip6->ip6_dst = *daddr6; 399 else { 400 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 401 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 402 ip6->ip6_dst.s6_addr32[1] = 0; 403 ip6->ip6_dst.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 404 ip6->ip6_dst.s6_addr32[3] = taddr6->s6_addr32[3]; 405 ip6->ip6_dst.s6_addr8[12] = 0xff; 406 } 407 if (!dad) { 408 #if 0 /* KAME way, exact address scope match */ 409 /* 410 * Select a source whose scope is the same as that of the dest. 411 * Typically, the dest is link-local solicitation multicast 412 * (i.e. neighbor discovery) or link-local/global unicast 413 * (i.e. neighbor un-reachability detection). 414 */ 415 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 416 if (ia == NULL) { 417 m_freem(m); 418 return; 419 } 420 ip6->ip6_src = ia->ia_addr.sin6_addr; 421 #else /* spec-wise correct */ 422 /* 423 * RFC2461 7.2.2: 424 * "If the source address of the packet prompting the 425 * solicitation is the same as one of the addresses assigned 426 * to the outgoing interface, that address SHOULD be placed 427 * in the IP Source Address of the outgoing solicitation. 428 * Otherwise, any one of the addresses assigned to the 429 * interface should be used." 430 * 431 * We use the source address for the prompting packet 432 * (saddr6), if: 433 * - saddr6 is given from the caller (by giving "ln"), and 434 * - saddr6 belongs to the outgoing interface. 435 * Otherwise, we perform a scope-wise match. 436 */ 437 struct ip6_hdr *hip6; /* hold ip6 */ 438 struct in6_addr *saddr6; 439 440 if (ln && ln->ln_hold) { 441 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 442 /* XXX pullup? */ 443 if (sizeof(*hip6) < ln->ln_hold->m_len) 444 saddr6 = &hip6->ip6_src; 445 else 446 saddr6 = NULL; 447 } else 448 saddr6 = NULL; 449 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 450 bcopy(saddr6, &ip6->ip6_src, sizeof(*saddr6)); 451 else { 452 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 453 if (ia == NULL) { 454 if (ln && ln->ln_hold) 455 m_freem(ln->ln_hold); 456 ln->ln_hold = NULL; 457 m_freem(m); 458 return; 459 } 460 ip6->ip6_src = ia->ia_addr.sin6_addr; 461 } 462 #endif 463 } else { 464 /* 465 * Source address for DAD packet must always be IPv6 466 * unspecified address. (0::0) 467 */ 468 bzero(&ip6->ip6_src, sizeof(ip6->ip6_src)); 469 } 470 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 471 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 472 nd_ns->nd_ns_code = 0; 473 nd_ns->nd_ns_reserved = 0; 474 nd_ns->nd_ns_target = *taddr6; 475 476 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target)) 477 nd_ns->nd_ns_target.s6_addr16[1] = 0; 478 479 /* 480 * Add source link-layer address option. 481 * 482 * spec implementation 483 * --- --- 484 * DAD packet MUST NOT do not add the option 485 * there's no link layer address: 486 * impossible do not add the option 487 * there's link layer address: 488 * Multicast NS MUST add one add the option 489 * Unicast NS SHOULD add one add the option 490 */ 491 if (!dad && (mac = nd6_ifptomac(ifp))) { 492 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 493 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 494 /* 8 byte alignments... */ 495 optlen = (optlen + 7) & ~7; 496 497 m->m_pkthdr.len += optlen; 498 m->m_len += optlen; 499 icmp6len += optlen; 500 bzero((caddr_t)nd_opt, optlen); 501 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 502 nd_opt->nd_opt_len = optlen >> 3; 503 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 504 } 505 506 ip6->ip6_plen = htons((u_short)icmp6len); 507 nd_ns->nd_ns_cksum = 0; 508 nd_ns->nd_ns_cksum 509 = in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 510 511 #if IPSEC 512 /* Don't lookup socket */ 513 if (ipsec_bypass == 0) 514 (void)ipsec_setsocket(m, NULL); 515 #endif 516 ip6_output(m, NULL, NULL, dad ? IPV6_DADOUTPUT : 0, &im6o, &outif); 517 if (outif) { 518 icmp6_ifstat_inc(outif, ifs6_out_msg); 519 icmp6_ifstat_inc(outif, ifs6_out_neighborsolicit); 520 } 521 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 522 } 523 524 /* 525 * Neighbor advertisement input handling. 526 * 527 * Based on RFC 2461 528 * Based on RFC 2462 (duplicated address detection) 529 * 530 * the following items are not implemented yet: 531 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 532 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 533 */ 534 void 535 nd6_na_input(m, off, icmp6len) 536 struct mbuf *m; 537 int off, icmp6len; 538 { 539 struct ifnet *ifp = m->m_pkthdr.rcvif; 540 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 541 struct nd_neighbor_advert *nd_na; 542 #if 0 543 struct in6_addr saddr6 = ip6->ip6_src; 544 #endif 545 struct in6_addr daddr6 = ip6->ip6_dst; 546 struct in6_addr taddr6; 547 int flags; 548 int is_router; 549 int is_solicited; 550 int is_override; 551 char *lladdr = NULL; 552 int lladdrlen = 0; 553 struct ifaddr *ifa; 554 struct llinfo_nd6 *ln; 555 struct rtentry *rt; 556 struct sockaddr_dl *sdl; 557 union nd_opts ndopts; 558 559 if (ip6->ip6_hlim != 255) { 560 nd6log((LOG_ERR, 561 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 562 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 563 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 564 goto bad; 565 } 566 567 #ifndef PULLDOWN_TEST 568 IP6_EXTHDR_CHECK(m, off, icmp6len,); 569 nd_na = (struct nd_neighbor_advert *)((caddr_t)ip6 + off); 570 #else 571 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 572 if (nd_na == NULL) { 573 icmp6stat.icp6s_tooshort++; 574 return; 575 } 576 #endif 577 taddr6 = nd_na->nd_na_target; 578 flags = nd_na->nd_na_flags_reserved; 579 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 580 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 581 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 582 583 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 584 taddr6.s6_addr16[1] = htons(ifp->if_index); 585 586 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 587 nd6log((LOG_ERR, 588 "nd6_na_input: invalid target address %s\n", 589 ip6_sprintf(&taddr6))); 590 goto bad; 591 } 592 if (IN6_IS_ADDR_MULTICAST(&daddr6)) 593 if (is_solicited) { 594 nd6log((LOG_ERR, 595 "nd6_na_input: a solicited adv is multicasted\n")); 596 goto bad; 597 } 598 599 icmp6len -= sizeof(*nd_na); 600 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 601 if (nd6_options(&ndopts) < 0) { 602 nd6log((LOG_INFO, 603 "nd6_na_input: invalid ND option, ignored\n")); 604 /* nd6_options have incremented stats */ 605 goto freeit; 606 } 607 608 if (ndopts.nd_opts_tgt_lladdr) { 609 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 610 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 611 } 612 613 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 614 615 /* 616 * Target address matches one of my interface address. 617 * 618 * If my address is tentative, this means that there's somebody 619 * already using the same address as mine. This indicates DAD failure. 620 * This is defined in RFC 2462. 621 * 622 * Otherwise, process as defined in RFC 2461. 623 */ 624 if (ifa 625 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 626 nd6_dad_na_input(ifa); 627 goto freeit; 628 } 629 630 /* Just for safety, maybe unnecessary. */ 631 if (ifa) { 632 log(LOG_ERR, 633 "nd6_na_input: duplicate IP6 address %s\n", 634 ip6_sprintf(&taddr6)); 635 goto freeit; 636 } 637 638 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 639 nd6log((LOG_INFO, 640 "nd6_na_input: lladdrlen mismatch for %s " 641 "(if %d, NA packet %d)\n", 642 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 643 goto bad; 644 } 645 646 /* 647 * If no neighbor cache entry is found, NA SHOULD silently be discarded. 648 */ 649 rt = nd6_lookup(&taddr6, 0, ifp); 650 if ((rt == NULL) || 651 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 652 ((sdl = SDL(rt->rt_gateway)) == NULL)) 653 goto freeit; 654 655 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 656 /* 657 * If the link-layer has address, and no lladdr option came, 658 * discard the packet. 659 */ 660 if (ifp->if_addrlen && !lladdr) 661 goto freeit; 662 663 /* 664 * Record link-layer address, and update the state. 665 */ 666 sdl->sdl_alen = ifp->if_addrlen; 667 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 668 if (is_solicited) { 669 ln->ln_state = ND6_LLINFO_REACHABLE; 670 ln->ln_byhint = 0; 671 if (ln->ln_expire) 672 ln->ln_expire = time_second + 673 nd_ifinfo[rt->rt_ifp->if_index].reachable; 674 } else { 675 ln->ln_state = ND6_LLINFO_STALE; 676 ln->ln_expire = time_second + nd6_gctimer; 677 } 678 if ((ln->ln_router = is_router) != 0) { 679 /* 680 * This means a router's state has changed from 681 * non-reachable to probably reachable, and might 682 * affect the status of associated prefixes.. 683 */ 684 pfxlist_onlink_check(); 685 } 686 } else { 687 int llchange; 688 689 /* 690 * Check if the link-layer address has changed or not. 691 */ 692 if (!lladdr) 693 llchange = 0; 694 else { 695 if (sdl->sdl_alen) { 696 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 697 llchange = 1; 698 else 699 llchange = 0; 700 } else 701 llchange = 1; 702 } 703 704 /* 705 * This is VERY complex. Look at it with care. 706 * 707 * override solicit lladdr llchange action 708 * (L: record lladdr) 709 * 710 * 0 0 n -- (2c) 711 * 0 0 y n (2b) L 712 * 0 0 y y (1) REACHABLE->STALE 713 * 0 1 n -- (2c) *->REACHABLE 714 * 0 1 y n (2b) L *->REACHABLE 715 * 0 1 y y (1) REACHABLE->STALE 716 * 1 0 n -- (2a) 717 * 1 0 y n (2a) L 718 * 1 0 y y (2a) L *->STALE 719 * 1 1 n -- (2a) *->REACHABLE 720 * 1 1 y n (2a) L *->REACHABLE 721 * 1 1 y y (2a) L *->REACHABLE 722 */ 723 if (!is_override && (lladdr && llchange)) { /* (1) */ 724 /* 725 * If state is REACHABLE, make it STALE. 726 * no other updates should be done. 727 */ 728 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 729 ln->ln_state = ND6_LLINFO_STALE; 730 ln->ln_expire = time_second + nd6_gctimer; 731 } 732 goto freeit; 733 } else if (is_override /* (2a) */ 734 || (!is_override && (lladdr && !llchange)) /* (2b) */ 735 || !lladdr) { /* (2c) */ 736 /* 737 * Update link-local address, if any. 738 */ 739 if (lladdr) { 740 sdl->sdl_alen = ifp->if_addrlen; 741 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 742 } 743 744 /* 745 * If solicited, make the state REACHABLE. 746 * If not solicited and the link-layer address was 747 * changed, make it STALE. 748 */ 749 if (is_solicited) { 750 ln->ln_state = ND6_LLINFO_REACHABLE; 751 ln->ln_byhint = 0; 752 if (ln->ln_expire) { 753 ln->ln_expire = time_second + 754 nd_ifinfo[ifp->if_index].reachable; 755 } 756 } else { 757 if (lladdr && llchange) { 758 ln->ln_state = ND6_LLINFO_STALE; 759 ln->ln_expire = time_second + nd6_gctimer; 760 } 761 } 762 } 763 764 if (ln->ln_router && !is_router) { 765 /* 766 * The peer dropped the router flag. 767 * Remove the sender from the Default Router List and 768 * update the Destination Cache entries. 769 */ 770 struct nd_defrouter *dr; 771 struct in6_addr *in6; 772 int s; 773 774 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 775 776 /* 777 * Lock to protect the default router list. 778 * XXX: this might be unnecessary, since this function 779 * is only called under the network software interrupt 780 * context. However, we keep it just for safety. 781 */ 782 s = splnet(); 783 dr = defrouter_lookup(in6, rt->rt_ifp); 784 if (dr) 785 defrtrlist_del(dr); 786 else if (!ip6_forwarding && (ip6_accept_rtadv || (rt->rt_ifp->if_eflags & IFEF_ACCEPT_RTADVD))) { 787 /* 788 * Even if the neighbor is not in the default 789 * router list, the neighbor may be used 790 * as a next hop for some destinations 791 * (e.g. redirect case). So we must 792 * call rt6_flush explicitly. 793 */ 794 rt6_flush(&ip6->ip6_src, rt->rt_ifp); 795 } 796 splx(s); 797 } 798 ln->ln_router = is_router; 799 } 800 rt->rt_flags &= ~RTF_REJECT; 801 ln->ln_asked = 0; 802 if (ln->ln_hold) { 803 /* 804 * we assume ifp is not a loopback here, so just set the 2nd 805 * argument as the 1st one. 806 */ 807 nd6_output(ifp, ifp, ln->ln_hold, 808 (struct sockaddr_in6 *)rt_key(rt), rt); 809 ln->ln_hold = 0; 810 } 811 812 freeit: 813 m_freem(m); 814 return; 815 816 bad: 817 icmp6stat.icp6s_badna++; 818 m_freem(m); 819 } 820 821 /* 822 * Neighbor advertisement output handling. 823 * 824 * Based on RFC 2461 825 * 826 * the following items are not implemented yet: 827 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 828 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 829 */ 830 void 831 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 832 struct ifnet *ifp; 833 const struct in6_addr *daddr6, *taddr6; 834 u_long flags; 835 int tlladdr; /* 1 if include target link-layer address */ 836 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 837 { 838 struct mbuf *m; 839 struct ip6_hdr *ip6; 840 struct nd_neighbor_advert *nd_na; 841 struct in6_ifaddr *ia = NULL; 842 struct ip6_moptions im6o; 843 int icmp6len; 844 int maxlen; 845 caddr_t mac = NULL; 846 struct ifnet *outif = NULL; 847 848 /* estimate the size of message */ 849 maxlen = sizeof(*ip6) + sizeof(*nd_na); 850 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 851 if (max_linkhdr + maxlen >= MCLBYTES) { 852 #if DIAGNOSTIC 853 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 854 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 855 #endif 856 return; 857 } 858 859 MGETHDR(m, M_DONTWAIT, MT_DATA); 860 if (m && max_linkhdr + maxlen >= MHLEN) { 861 MCLGET(m, M_DONTWAIT); 862 if ((m->m_flags & M_EXT) == 0) { 863 m_free(m); 864 m = NULL; 865 } 866 } 867 if (m == NULL) 868 return; 869 m->m_pkthdr.rcvif = NULL; 870 871 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 872 m->m_flags |= M_MCAST; 873 im6o.im6o_multicast_ifp = ifp; 874 im6o.im6o_multicast_hlim = 255; 875 im6o.im6o_multicast_loop = 0; 876 } 877 878 icmp6len = sizeof(*nd_na); 879 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 880 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 881 882 /* fill neighbor advertisement packet */ 883 ip6 = mtod(m, struct ip6_hdr *); 884 ip6->ip6_flow = 0; 885 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 886 ip6->ip6_vfc |= IPV6_VERSION; 887 ip6->ip6_nxt = IPPROTO_ICMPV6; 888 ip6->ip6_hlim = 255; 889 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 890 /* reply to DAD */ 891 ip6->ip6_dst.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 892 ip6->ip6_dst.s6_addr16[1] = htons(ifp->if_index); 893 ip6->ip6_dst.s6_addr32[1] = 0; 894 ip6->ip6_dst.s6_addr32[2] = 0; 895 ip6->ip6_dst.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 896 flags &= ~ND_NA_FLAG_SOLICITED; 897 } else 898 ip6->ip6_dst = *daddr6; 899 900 /* 901 * Select a source whose scope is the same as that of the dest. 902 */ 903 ia = in6_ifawithifp(ifp, &ip6->ip6_dst); 904 if (ia == NULL) { 905 m_freem(m); 906 return; 907 } 908 ip6->ip6_src = ia->ia_addr.sin6_addr; 909 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 910 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 911 nd_na->nd_na_code = 0; 912 nd_na->nd_na_target = *taddr6; 913 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target)) 914 nd_na->nd_na_target.s6_addr16[1] = 0; 915 916 /* 917 * "tlladdr" indicates NS's condition for adding tlladdr or not. 918 * see nd6_ns_input() for details. 919 * Basically, if NS packet is sent to unicast/anycast addr, 920 * target lladdr option SHOULD NOT be included. 921 */ 922 if (tlladdr) { 923 /* 924 * sdl0 != NULL indicates proxy NA. If we do proxy, use 925 * lladdr in sdl0. If we are not proxying (sending NA for 926 * my address) use lladdr configured for the interface. 927 */ 928 if (sdl0 == NULL) 929 mac = nd6_ifptomac(ifp); 930 else if (sdl0->sa_family == AF_LINK) { 931 struct sockaddr_dl *sdl; 932 sdl = (struct sockaddr_dl *)sdl0; 933 if (sdl->sdl_alen == ifp->if_addrlen) 934 mac = LLADDR(sdl); 935 } 936 } 937 if (tlladdr && mac) { 938 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 939 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 940 941 /* roundup to 8 bytes alignment! */ 942 optlen = (optlen + 7) & ~7; 943 944 m->m_pkthdr.len += optlen; 945 m->m_len += optlen; 946 icmp6len += optlen; 947 bzero((caddr_t)nd_opt, optlen); 948 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 949 nd_opt->nd_opt_len = optlen >> 3; 950 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 951 } else 952 flags &= ~ND_NA_FLAG_OVERRIDE; 953 954 ip6->ip6_plen = htons((u_short)icmp6len); 955 nd_na->nd_na_flags_reserved = flags; 956 nd_na->nd_na_cksum = 0; 957 nd_na->nd_na_cksum = 958 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 959 960 #if IPSEC 961 /* Don't lookup socket */ 962 if (ipsec_bypass == 0) 963 (void)ipsec_setsocket(m, NULL); 964 #endif 965 ip6_output(m, NULL, NULL, 0, &im6o, &outif); 966 if (outif) { 967 icmp6_ifstat_inc(outif, ifs6_out_msg); 968 icmp6_ifstat_inc(outif, ifs6_out_neighboradvert); 969 } 970 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 971 } 972 973 caddr_t 974 nd6_ifptomac(ifp) 975 struct ifnet *ifp; 976 { 977 switch (ifp->if_type) { 978 case IFT_ARCNET: 979 case IFT_ETHER: 980 case IFT_FDDI: 981 case IFT_IEEE1394: 982 #if IFT_L2VLAN 983 case IFT_L2VLAN: 984 #endif 985 #if IFT_IEEE80211 986 case IFT_IEEE80211: 987 #endif 988 return ((caddr_t)(ifp + 1)); 989 break; 990 default: 991 return NULL; 992 } 993 } 994 995 TAILQ_HEAD(dadq_head, dadq); 996 struct dadq { 997 TAILQ_ENTRY(dadq) dad_list; 998 struct ifaddr *dad_ifa; 999 int dad_count; /* max NS to send */ 1000 int dad_ns_tcount; /* # of trials to send NS */ 1001 int dad_ns_ocount; /* NS sent so far */ 1002 int dad_ns_icount; 1003 int dad_na_icount; 1004 }; 1005 1006 static struct dadq_head dadq; 1007 static int dad_init = 0; 1008 1009 static struct dadq * 1010 nd6_dad_find(ifa) 1011 struct ifaddr *ifa; 1012 { 1013 struct dadq *dp; 1014 1015 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 1016 if (dp->dad_ifa == ifa) 1017 return dp; 1018 } 1019 return NULL; 1020 } 1021 1022 #ifdef __APPLE__ 1023 void 1024 nd6_dad_stoptimer(ifa) 1025 struct ifaddr *ifa; 1026 { 1027 1028 untimeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa); 1029 } 1030 #else 1031 static void 1032 nd6_dad_starttimer(dp, ticks) 1033 struct dadq *dp; 1034 int ticks; 1035 { 1036 1037 callout_reset(&dp->dad_timer_ch, ticks, 1038 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 1039 } 1040 1041 static void 1042 nd6_dad_stoptimer(dp) 1043 struct dadq *dp; 1044 { 1045 1046 callout_stop(&dp->dad_timer_ch); 1047 } 1048 #endif 1049 1050 /* 1051 * Start Duplicated Address Detection (DAD) for specified interface address. 1052 */ 1053 void 1054 nd6_dad_start(ifa, tick) 1055 struct ifaddr *ifa; 1056 int *tick; /* minimum delay ticks for IFF_UP event */ 1057 { 1058 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1059 struct dadq *dp; 1060 1061 if (!dad_init) { 1062 TAILQ_INIT(&dadq); 1063 dad_init++; 1064 } 1065 1066 /* 1067 * If we don't need DAD, don't do it. 1068 * There are several cases: 1069 * - DAD is disabled (ip6_dad_count == 0) 1070 * - the interface address is anycast 1071 */ 1072 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1073 log(LOG_DEBUG, 1074 "nd6_dad_start: called with non-tentative address " 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 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1081 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1082 return; 1083 } 1084 if (!ip6_dad_count) { 1085 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1086 return; 1087 } 1088 if (!ifa->ifa_ifp) 1089 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1090 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1091 return; 1092 if (nd6_dad_find(ifa) != NULL) { 1093 /* DAD already in progress */ 1094 return; 1095 } 1096 1097 dp = _MALLOC(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1098 if (dp == NULL) { 1099 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1100 "%s(%s)\n", 1101 ip6_sprintf(&ia->ia_addr.sin6_addr), 1102 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1103 return; 1104 } 1105 bzero(dp, sizeof(*dp)); 1106 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1107 1108 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1109 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1110 1111 /* 1112 * Send NS packet for DAD, ip6_dad_count times. 1113 * Note that we must delay the first transmission, if this is the 1114 * first packet to be sent from the interface after interface 1115 * (re)initialization. 1116 */ 1117 dp->dad_ifa = ifa; 1118 ifaref(ifa); /*just for safety*/ 1119 dp->dad_count = ip6_dad_count; 1120 dp->dad_ns_icount = dp->dad_na_icount = 0; 1121 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1122 if (tick == NULL) { 1123 nd6_dad_ns_output(dp, ifa); 1124 timeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa, 1125 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1126 } else { 1127 int ntick; 1128 1129 if (*tick == 0) 1130 ntick = random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1131 else 1132 ntick = *tick + random() % (hz / 2); 1133 *tick = ntick; 1134 timeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa, 1135 ntick); 1136 } 1137 } 1138 1139 /* 1140 * terminate DAD unconditionally. used for address removals. 1141 */ 1142 void 1143 nd6_dad_stop(ifa) 1144 struct ifaddr *ifa; 1145 { 1146 struct dadq *dp; 1147 1148 if (!dad_init) 1149 return; 1150 dp = nd6_dad_find(ifa); 1151 if (!dp) { 1152 /* DAD wasn't started yet */ 1153 return; 1154 } 1155 1156 untimeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa); 1157 1158 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1159 FREE(dp, M_IP6NDP); 1160 dp = NULL; 1161 ifafree(ifa); 1162 } 1163 1164 1165 static void 1166 nd6_dad_timer_funnel(ifa) 1167 struct ifaddr *ifa; 1168 { 1169 1170 #ifdef __APPLE__ 1171 boolean_t funnel_state; 1172 funnel_state = thread_funnel_set(network_flock, TRUE); 1173 #endif 1174 nd6_dad_timer(ifa); 1175 #ifdef __APPLE__ 1176 (void) thread_funnel_set(network_flock, FALSE); 1177 #endif 1178 1179 } 1180 1181 static void 1182 nd6_dad_timer(ifa) 1183 struct ifaddr *ifa; 1184 { 1185 int s; 1186 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1187 struct dadq *dp; 1188 1189 s = splnet(); /* XXX */ 1190 1191 /* Sanity check */ 1192 if (ia == NULL) { 1193 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1194 goto done; 1195 } 1196 dp = nd6_dad_find(ifa); 1197 if (dp == NULL) { 1198 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1199 goto done; 1200 } 1201 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1202 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1203 "%s(%s)\n", 1204 ip6_sprintf(&ia->ia_addr.sin6_addr), 1205 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1206 goto done; 1207 } 1208 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1209 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1210 "%s(%s)\n", 1211 ip6_sprintf(&ia->ia_addr.sin6_addr), 1212 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1213 goto done; 1214 } 1215 1216 /* timeouted with IFF_{RUNNING,UP} check */ 1217 if (dp->dad_ns_tcount > dad_maxtry) { 1218 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1219 if_name(ifa->ifa_ifp))); 1220 1221 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1222 FREE(dp, M_IP6NDP); 1223 dp = NULL; 1224 ifafree(ifa); 1225 goto done; 1226 } 1227 1228 /* Need more checks? */ 1229 if (dp->dad_ns_ocount < dp->dad_count) { 1230 /* 1231 * We have more NS to go. Send NS packet for DAD. 1232 */ 1233 nd6_dad_ns_output(dp, ifa); 1234 timeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa, 1235 nd_ifinfo[ifa->ifa_ifp->if_index].retrans * hz / 1000); 1236 } else { 1237 /* 1238 * We have transmitted sufficient number of DAD packets. 1239 * See what we've got. 1240 */ 1241 int duplicate; 1242 1243 duplicate = 0; 1244 1245 if (dp->dad_na_icount) { 1246 /* 1247 * the check is in nd6_dad_na_input(), 1248 * but just in case 1249 */ 1250 duplicate++; 1251 } 1252 1253 if (dp->dad_ns_icount) { 1254 #if 0 /* heuristics */ 1255 /* 1256 * if 1257 * - we have sent many(?) DAD NS, and 1258 * - the number of NS we sent equals to the 1259 * number of NS we've got, and 1260 * - we've got no NA 1261 * we may have a faulty network card/driver which 1262 * loops back multicasts to myself. 1263 */ 1264 if (3 < dp->dad_count 1265 && dp->dad_ns_icount == dp->dad_count 1266 && dp->dad_na_icount == 0) { 1267 log(LOG_INFO, "DAD questionable for %s(%s): " 1268 "network card loops back multicast?\n", 1269 ip6_sprintf(&ia->ia_addr.sin6_addr), 1270 if_name(ifa->ifa_ifp)); 1271 /* XXX consider it a duplicate or not? */ 1272 /* duplicate++; */ 1273 } else { 1274 /* We've seen NS, means DAD has failed. */ 1275 duplicate++; 1276 } 1277 #else 1278 /* We've seen NS, means DAD has failed. */ 1279 duplicate++; 1280 #endif 1281 } 1282 1283 if (duplicate) { 1284 /* (*dp) will be freed in nd6_dad_duplicated() */ 1285 dp = NULL; 1286 nd6_dad_duplicated(ifa); 1287 } else { 1288 /* 1289 * We are done with DAD. No NA came, no NS came. 1290 * duplicated address found. 1291 */ 1292 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1293 1294 nd6log((LOG_DEBUG, 1295 "%s: DAD complete for %s - no duplicates found\n", 1296 if_name(ifa->ifa_ifp), 1297 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1298 1299 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1300 FREE(dp, M_IP6NDP); 1301 dp = NULL; 1302 ifafree(ifa); 1303 } 1304 } 1305 1306 done: 1307 splx(s); 1308 } 1309 1310 void 1311 nd6_dad_duplicated(ifa) 1312 struct ifaddr *ifa; 1313 { 1314 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1315 struct dadq *dp; 1316 1317 dp = nd6_dad_find(ifa); 1318 if (dp == NULL) { 1319 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1320 return; 1321 } 1322 1323 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1324 "NS in/out=%d/%d, NA in=%d\n", 1325 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1326 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1327 1328 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1329 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1330 1331 /* We are done with DAD, with duplicated address found. (failure) */ 1332 untimeout((void (*) __P((void *)))nd6_dad_timer_funnel, (void *)ifa); 1333 1334 1335 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1336 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1337 log(LOG_ERR, "%s: manual intervention required\n", 1338 if_name(ifa->ifa_ifp)); 1339 1340 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1341 FREE(dp, M_IP6NDP); 1342 dp = NULL; 1343 ifafree(ifa); 1344 } 1345 1346 static void 1347 nd6_dad_ns_output(dp, ifa) 1348 struct dadq *dp; 1349 struct ifaddr *ifa; 1350 { 1351 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1352 struct ifnet *ifp = ifa->ifa_ifp; 1353 1354 dp->dad_ns_tcount++; 1355 if ((ifp->if_flags & IFF_UP) == 0) { 1356 #if 0 1357 printf("%s: interface down?\n", if_name(ifp)); 1358 #endif 1359 return; 1360 } 1361 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1362 #if 0 1363 printf("%s: interface not running?\n", if_name(ifp)); 1364 #endif 1365 return; 1366 } 1367 1368 dp->dad_ns_ocount++; 1369 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1370 } 1371 1372 static void 1373 nd6_dad_ns_input(ifa) 1374 struct ifaddr *ifa; 1375 { 1376 struct in6_ifaddr *ia; 1377 struct ifnet *ifp; 1378 const struct in6_addr *taddr6; 1379 struct dadq *dp; 1380 int duplicate; 1381 1382 if (!ifa) 1383 panic("ifa == NULL in nd6_dad_ns_input"); 1384 1385 ia = (struct in6_ifaddr *)ifa; 1386 ifp = ifa->ifa_ifp; 1387 taddr6 = &ia->ia_addr.sin6_addr; 1388 duplicate = 0; 1389 dp = nd6_dad_find(ifa); 1390 1391 /* Quickhack - completely ignore DAD NS packets */ 1392 if (dad_ignore_ns) { 1393 nd6log((LOG_INFO, 1394 "nd6_dad_ns_input: ignoring DAD NS packet for " 1395 "address %s(%s)\n", ip6_sprintf(taddr6), 1396 if_name(ifa->ifa_ifp))); 1397 return; 1398 } 1399 1400 /* 1401 * if I'm yet to start DAD, someone else started using this address 1402 * first. I have a duplicate and you win. 1403 */ 1404 if (!dp || dp->dad_ns_ocount == 0) 1405 duplicate++; 1406 1407 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1408 1409 if (duplicate) { 1410 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1411 nd6_dad_duplicated(ifa); 1412 } else { 1413 /* 1414 * not sure if I got a duplicate. 1415 * increment ns count and see what happens. 1416 */ 1417 if (dp) 1418 dp->dad_ns_icount++; 1419 } 1420 } 1421 1422 static void 1423 nd6_dad_na_input(ifa) 1424 struct ifaddr *ifa; 1425 { 1426 struct dadq *dp; 1427 1428 if (!ifa) 1429 panic("ifa == NULL in nd6_dad_na_input"); 1430 1431 dp = nd6_dad_find(ifa); 1432 if (dp) 1433 dp->dad_na_icount++; 1434 1435 /* remove the address. */ 1436 nd6_dad_duplicated(ifa); 1437 }
Cache object: 397ec9b9fb80196b586f0b5ac978315b
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