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sys/netinet6/nd6_nbr.c
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1 /* $OpenBSD: nd6_nbr.c,v 1.142 2023/01/06 14:17:15 kn 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/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/ioctl.h> 42 #include <sys/syslog.h> 43 #include <sys/queue.h> 44 #include <sys/timeout.h> 45 46 #include <net/if.h> 47 #include <net/if_var.h> 48 #include <net/if_types.h> 49 #include <net/if_dl.h> 50 #include <net/route.h> 51 52 #include <netinet/in.h> 53 #include <netinet/if_ether.h> 54 #include <netinet6/in6_var.h> 55 #include <netinet/ip6.h> 56 #include <netinet6/ip6_var.h> 57 #include <netinet6/nd6.h> 58 #include <netinet/icmp6.h> 59 60 #include "carp.h" 61 #if NCARP > 0 62 #include <netinet/ip_carp.h> 63 #endif 64 65 static TAILQ_HEAD(, dadq) dadq = 66 TAILQ_HEAD_INITIALIZER(dadq); /* list of addresses to run DAD on */ 67 struct dadq { 68 TAILQ_ENTRY(dadq) dad_list; 69 struct ifaddr *dad_ifa; 70 int dad_count; /* max NS to send */ 71 int dad_ns_tcount; /* # of trials to send NS */ 72 int dad_ns_ocount; /* NS sent so far */ 73 int dad_ns_icount; 74 int dad_na_icount; 75 struct timeout dad_timer_ch; 76 }; 77 78 struct dadq *nd6_dad_find(struct ifaddr *); 79 void nd6_dad_destroy(struct dadq *); 80 void nd6_dad_starttimer(struct dadq *); 81 void nd6_dad_stoptimer(struct dadq *); 82 void nd6_dad_timer(void *); 83 void nd6_dad_ns_output(struct dadq *, struct ifaddr *); 84 void nd6_dad_ns_input(struct ifaddr *); 85 void nd6_dad_duplicated(struct dadq *); 86 87 int nd6_isneighbor(const struct ifnet *, const struct in6_addr *); 88 89 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 90 91 /* 92 * Input an Neighbor Solicitation Message. 93 * 94 * Based on RFC 2461 95 * Based on RFC 2462 (duplicated address detection) 96 */ 97 void 98 nd6_ns_input(struct mbuf *m, int off, int icmp6len) 99 { 100 struct ifnet *ifp; 101 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 102 struct nd_neighbor_solicit *nd_ns; 103 struct in6_addr saddr6 = ip6->ip6_src; 104 struct in6_addr daddr6 = ip6->ip6_dst; 105 struct in6_addr taddr6; 106 struct in6_addr myaddr6; 107 char *lladdr = NULL; 108 struct ifaddr *ifa = NULL; 109 int lladdrlen = 0; 110 int anycast = 0, proxy = 0, tentative = 0; 111 int router = ip6_forwarding; 112 int tlladdr; 113 struct nd_opts ndopts; 114 struct sockaddr_dl *proxydl = NULL; 115 char addr[INET6_ADDRSTRLEN], addr0[INET6_ADDRSTRLEN]; 116 117 ifp = if_get(m->m_pkthdr.ph_ifidx); 118 if (ifp == NULL) 119 goto freeit; 120 121 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 122 if (nd_ns == NULL) { 123 icmp6stat_inc(icp6s_tooshort); 124 if_put(ifp); 125 return; 126 } 127 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 128 taddr6 = nd_ns->nd_ns_target; 129 130 if (ip6->ip6_hlim != 255) { 131 nd6log((LOG_ERR, 132 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 133 ip6->ip6_hlim, 134 inet_ntop(AF_INET6, &ip6->ip6_src, addr, sizeof(addr)), 135 inet_ntop(AF_INET6, &ip6->ip6_dst, addr0, sizeof(addr0)), 136 ifp->if_xname)); 137 goto bad; 138 } 139 140 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 141 /* dst has to be solicited node multicast address. */ 142 /* don't check ifindex portion */ 143 if (daddr6.s6_addr16[0] == __IPV6_ADDR_INT16_MLL && 144 daddr6.s6_addr32[1] == 0 && 145 daddr6.s6_addr32[2] == __IPV6_ADDR_INT32_ONE && 146 daddr6.s6_addr8[12] == 0xff) { 147 ; /*good*/ 148 } else { 149 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 150 "(wrong ip6 dst)\n")); 151 goto bad; 152 } 153 } else { 154 /* 155 * Make sure the source address is from a neighbor's address. 156 */ 157 if (!nd6_isneighbor(ifp, &saddr6)) { 158 nd6log((LOG_INFO, "nd6_ns_input: " 159 "NS packet from non-neighbor\n")); 160 goto bad; 161 } 162 } 163 164 165 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 166 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 167 goto bad; 168 } 169 170 if (IN6_IS_SCOPE_EMBED(&taddr6)) 171 taddr6.s6_addr16[1] = htons(ifp->if_index); 172 173 icmp6len -= sizeof(*nd_ns); 174 if (nd6_options(nd_ns + 1, icmp6len, &ndopts) < 0) { 175 nd6log((LOG_INFO, 176 "nd6_ns_input: invalid ND option, ignored\n")); 177 /* nd6_options have incremented stats */ 178 goto freeit; 179 } 180 181 if (ndopts.nd_opts_src_lladdr) { 182 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 183 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 184 } 185 186 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 187 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 188 "(link-layer address option)\n")); 189 goto bad; 190 } 191 192 /* 193 * Attaching target link-layer address to the NA? 194 * (RFC 2461 7.2.4) 195 * 196 * NS IP dst is unicast/anycast MUST NOT add 197 * NS IP dst is solicited-node multicast MUST add 198 * 199 * In implementation, we add target link-layer address by default. 200 * We do not add one in MUST NOT cases. 201 */ 202 #if 0 /* too much! */ 203 ifa = &in6ifa_ifpwithaddr(ifp, &daddr6)->ia_ifa; 204 if (ifa && (ifatoia6(ifa)->ia6_flags & IN6_IFF_ANYCAST)) 205 tlladdr = 0; 206 else 207 #endif 208 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 209 tlladdr = 0; 210 else 211 tlladdr = 1; 212 213 /* 214 * Target address (taddr6) must be either: 215 * (1) Valid unicast/anycast address for my receiving interface, 216 * (2) Unicast address for which I'm offering proxy service, or 217 * (3) "tentative" address on which DAD is being performed. 218 */ 219 /* (1) and (3) check. */ 220 ifa = &in6ifa_ifpwithaddr(ifp, &taddr6)->ia_ifa; 221 #if NCARP > 0 222 if (ifp->if_type == IFT_CARP && ifa && !carp_iamatch(ifp)) 223 ifa = NULL; 224 #endif 225 226 /* (2) check. */ 227 if (!ifa) { 228 struct rtentry *rt; 229 struct sockaddr_in6 tsin6; 230 231 bzero(&tsin6, sizeof tsin6); 232 tsin6.sin6_len = sizeof(struct sockaddr_in6); 233 tsin6.sin6_family = AF_INET6; 234 tsin6.sin6_addr = taddr6; 235 236 rt = rtalloc(sin6tosa(&tsin6), 0, m->m_pkthdr.ph_rtableid); 237 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 238 rt->rt_gateway->sa_family == AF_LINK) { 239 /* 240 * proxy NDP for single entry 241 */ 242 ifa = &in6ifa_ifpforlinklocal(ifp, IN6_IFF_TENTATIVE| 243 IN6_IFF_DUPLICATED|IN6_IFF_ANYCAST)->ia_ifa; 244 if (ifa) { 245 proxy = 1; 246 proxydl = satosdl(rt->rt_gateway); 247 router = 0; /* XXX */ 248 } 249 } 250 if (rt) 251 rtfree(rt); 252 } 253 if (!ifa) { 254 /* 255 * We've got an NS packet, and we don't have that address 256 * assigned for us. We MUST silently ignore it. 257 * See RFC2461 7.2.3. 258 */ 259 goto freeit; 260 } 261 myaddr6 = *IFA_IN6(ifa); 262 anycast = ifatoia6(ifa)->ia6_flags & IN6_IFF_ANYCAST; 263 tentative = ifatoia6(ifa)->ia6_flags & IN6_IFF_TENTATIVE; 264 if (ifatoia6(ifa)->ia6_flags & IN6_IFF_DUPLICATED) 265 goto freeit; 266 267 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 268 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 269 "(if %d, NS packet %d)\n", 270 inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)), 271 ifp->if_addrlen, lladdrlen - 2)); 272 goto bad; 273 } 274 275 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 276 log(LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 277 inet_ntop(AF_INET6, &saddr6, addr, sizeof(addr))); 278 goto freeit; 279 } 280 281 /* 282 * We have neighbor solicitation packet, with target address equals to 283 * one of my tentative address. 284 * 285 * src addr how to process? 286 * --- --- 287 * multicast of course, invalid (rejected in ip6_input) 288 * unicast somebody is doing address resolution -> ignore 289 * unspec dup address detection 290 * 291 * The processing is defined in RFC 2462. 292 */ 293 if (tentative) { 294 /* 295 * If source address is unspecified address, it is for 296 * duplicated address detection. 297 * 298 * If not, the packet is for address resolution; 299 * silently ignore it. 300 */ 301 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 302 nd6_dad_ns_input(ifa); 303 304 goto freeit; 305 } 306 307 /* 308 * If the source address is unspecified address, entries must not 309 * be created or updated. 310 * It looks that sender is performing DAD. Output NA toward 311 * all-node multicast address, to tell the sender that I'm using 312 * the address. 313 * S bit ("solicited") must be zero. 314 */ 315 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 316 saddr6 = in6addr_linklocal_allnodes; 317 saddr6.s6_addr16[1] = htons(ifp->if_index); 318 nd6_na_output(ifp, &saddr6, &taddr6, 319 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 320 (router ? ND_NA_FLAG_ROUTER : 0), 321 tlladdr, sdltosa(proxydl)); 322 goto freeit; 323 } 324 325 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 326 327 nd6_na_output(ifp, &saddr6, &taddr6, 328 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 329 (router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 330 tlladdr, sdltosa(proxydl)); 331 freeit: 332 m_freem(m); 333 if_put(ifp); 334 return; 335 336 bad: 337 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", 338 inet_ntop(AF_INET6, &saddr6, addr, sizeof(addr)))); 339 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", 340 inet_ntop(AF_INET6, &daddr6, addr, sizeof(addr)))); 341 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", 342 inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)))); 343 icmp6stat_inc(icp6s_badns); 344 m_freem(m); 345 if_put(ifp); 346 } 347 348 /* 349 * Output an Neighbor Solicitation Message. Caller specifies: 350 * - ICMP6 header source IP6 address 351 * - ND6 header target IP6 address 352 * - ND6 header source datalink address 353 * 354 * Based on RFC 2461 355 * Based on RFC 2462 (duplicated address detection) 356 * 357 * ln - for source address determination 358 * dad - duplicated address detection 359 */ 360 void 361 nd6_ns_output(struct ifnet *ifp, const struct in6_addr *daddr6, 362 const struct in6_addr *taddr6, const struct llinfo_nd6 *ln, int dad) 363 { 364 struct mbuf *m; 365 struct ip6_hdr *ip6; 366 struct nd_neighbor_solicit *nd_ns; 367 struct sockaddr_in6 src_sa, dst_sa; 368 struct ip6_moptions im6o; 369 int icmp6len; 370 int maxlen; 371 caddr_t mac; 372 373 if (IN6_IS_ADDR_MULTICAST(taddr6)) 374 return; 375 376 /* estimate the size of message */ 377 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 378 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 379 #ifdef DIAGNOSTIC 380 if (max_linkhdr + maxlen >= MCLBYTES) { 381 printf("%s: max_linkhdr + maxlen >= MCLBYTES " 382 "(%d + %d > %d)\n", __func__, max_linkhdr, maxlen, MCLBYTES); 383 panic("%s: insufficient MCLBYTES", __func__); 384 /* NOTREACHED */ 385 } 386 #endif 387 388 MGETHDR(m, M_DONTWAIT, MT_DATA); 389 if (m && max_linkhdr + maxlen >= MHLEN) { 390 MCLGET(m, M_DONTWAIT); 391 if ((m->m_flags & M_EXT) == 0) { 392 m_free(m); 393 m = NULL; 394 } 395 } 396 if (m == NULL) 397 return; 398 m->m_pkthdr.ph_ifidx = 0; 399 m->m_pkthdr.ph_rtableid = ifp->if_rdomain; 400 401 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 402 m->m_flags |= M_MCAST; 403 im6o.im6o_ifidx = ifp->if_index; 404 im6o.im6o_hlim = 255; 405 im6o.im6o_loop = 0; 406 } 407 408 icmp6len = sizeof(*nd_ns); 409 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 410 m_align(m, maxlen); 411 412 /* fill neighbor solicitation packet */ 413 ip6 = mtod(m, struct ip6_hdr *); 414 ip6->ip6_flow = 0; 415 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 416 ip6->ip6_vfc |= IPV6_VERSION; 417 /* ip6->ip6_plen will be set later */ 418 ip6->ip6_nxt = IPPROTO_ICMPV6; 419 ip6->ip6_hlim = 255; 420 /* determine the source and destination addresses */ 421 bzero(&src_sa, sizeof(src_sa)); 422 bzero(&dst_sa, sizeof(dst_sa)); 423 src_sa.sin6_family = dst_sa.sin6_family = AF_INET6; 424 src_sa.sin6_len = dst_sa.sin6_len = sizeof(struct sockaddr_in6); 425 if (daddr6) 426 dst_sa.sin6_addr = *daddr6; 427 else { 428 dst_sa.sin6_addr.s6_addr16[0] = __IPV6_ADDR_INT16_MLL; 429 dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 430 dst_sa.sin6_addr.s6_addr32[1] = 0; 431 dst_sa.sin6_addr.s6_addr32[2] = __IPV6_ADDR_INT32_ONE; 432 dst_sa.sin6_addr.s6_addr32[3] = taddr6->s6_addr32[3]; 433 dst_sa.sin6_addr.s6_addr8[12] = 0xff; 434 } 435 ip6->ip6_dst = dst_sa.sin6_addr; 436 if (!dad) { 437 /* 438 * RFC2461 7.2.2: 439 * "If the source address of the packet prompting the 440 * solicitation is the same as one of the addresses assigned 441 * to the outgoing interface, that address SHOULD be placed 442 * in the IP Source Address of the outgoing solicitation. 443 * Otherwise, any one of the addresses assigned to the 444 * interface should be used." 445 * 446 * We use the source address for the prompting packet 447 * (saddr6), if: 448 * - saddr6 is given from the caller (by giving "ln"), and 449 * - saddr6 belongs to the outgoing interface and 450 * - if taddr is link local saddr6 must be link local as well 451 * Otherwise, we perform the source address selection as usual. 452 */ 453 struct ip6_hdr *hip6; /* hold ip6 */ 454 struct in6_addr *saddr6; 455 456 if (ln && ln->ln_hold) { 457 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 458 if (sizeof(*hip6) <= ln->ln_hold->m_len) { 459 saddr6 = &hip6->ip6_src; 460 if (saddr6 && IN6_IS_ADDR_LINKLOCAL(taddr6) && 461 !IN6_IS_ADDR_LINKLOCAL(saddr6)) 462 saddr6 = NULL; 463 } else 464 saddr6 = NULL; 465 } else 466 saddr6 = NULL; 467 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 468 src_sa.sin6_addr = *saddr6; 469 else { 470 struct rtentry *rt; 471 472 rt = rtalloc(sin6tosa(&dst_sa), RT_RESOLVE, 473 m->m_pkthdr.ph_rtableid); 474 if (!rtisvalid(rt)) { 475 char addr[INET6_ADDRSTRLEN]; 476 477 nd6log((LOG_DEBUG, 478 "%s: source can't be determined: dst=%s\n", 479 __func__, inet_ntop(AF_INET6, 480 &dst_sa.sin6_addr, addr, sizeof(addr)))); 481 rtfree(rt); 482 goto bad; 483 } 484 src_sa.sin6_addr = 485 ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr; 486 rtfree(rt); 487 } 488 } else { 489 /* 490 * Source address for DAD packet must always be IPv6 491 * unspecified address. (0::0) 492 * We actually don't have to 0-clear the address (we did it 493 * above), but we do so here explicitly to make the intention 494 * clearer. 495 */ 496 bzero(&src_sa.sin6_addr, sizeof(src_sa.sin6_addr)); 497 } 498 ip6->ip6_src = src_sa.sin6_addr; 499 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 500 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 501 nd_ns->nd_ns_code = 0; 502 nd_ns->nd_ns_reserved = 0; 503 nd_ns->nd_ns_target = *taddr6; 504 505 if (IN6_IS_SCOPE_EMBED(&nd_ns->nd_ns_target)) 506 nd_ns->nd_ns_target.s6_addr16[1] = 0; 507 508 /* 509 * Add source link-layer address option. 510 * 511 * spec implementation 512 * --- --- 513 * DAD packet MUST NOT do not add the option 514 * there's no link layer address: 515 * impossible do not add the option 516 * there's link layer address: 517 * Multicast NS MUST add one add the option 518 * Unicast NS SHOULD add one add the option 519 */ 520 if (!dad && (mac = nd6_ifptomac(ifp))) { 521 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 522 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 523 /* 8 byte alignments... */ 524 optlen = (optlen + 7) & ~7; 525 526 m->m_pkthdr.len += optlen; 527 m->m_len += optlen; 528 icmp6len += optlen; 529 bzero((caddr_t)nd_opt, optlen); 530 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 531 nd_opt->nd_opt_len = optlen >> 3; 532 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 533 } 534 535 ip6->ip6_plen = htons((u_short)icmp6len); 536 nd_ns->nd_ns_cksum = 0; 537 m->m_pkthdr.csum_flags |= M_ICMP_CSUM_OUT; 538 539 ip6_output(m, NULL, NULL, dad ? IPV6_UNSPECSRC : 0, &im6o, NULL); 540 icmp6stat_inc(icp6s_outhist + ND_NEIGHBOR_SOLICIT); 541 return; 542 543 bad: 544 m_freem(m); 545 } 546 547 /* 548 * Neighbor advertisement input handling. 549 * 550 * Based on RFC 2461 551 * Based on RFC 2462 (duplicated address detection) 552 * 553 * the following items are not implemented yet: 554 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 555 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 556 */ 557 void 558 nd6_na_input(struct mbuf *m, int off, int icmp6len) 559 { 560 struct ifnet *ifp; 561 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 562 struct nd_neighbor_advert *nd_na; 563 struct in6_addr daddr6 = ip6->ip6_dst; 564 struct in6_addr taddr6; 565 int flags; 566 int is_router; 567 int is_solicited; 568 int is_override; 569 char *lladdr = NULL; 570 int lladdrlen = 0; 571 struct ifaddr *ifa; 572 struct in6_ifaddr *ifa6; 573 struct llinfo_nd6 *ln; 574 struct rtentry *rt = NULL; 575 struct sockaddr_dl *sdl; 576 struct nd_opts ndopts; 577 char addr[INET6_ADDRSTRLEN], addr0[INET6_ADDRSTRLEN]; 578 579 NET_ASSERT_LOCKED(); 580 581 ifp = if_get(m->m_pkthdr.ph_ifidx); 582 if (ifp == NULL) 583 goto freeit; 584 585 if (ip6->ip6_hlim != 255) { 586 nd6log((LOG_ERR, 587 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 588 ip6->ip6_hlim, 589 inet_ntop(AF_INET6, &ip6->ip6_src, addr, sizeof(addr)), 590 inet_ntop(AF_INET6, &ip6->ip6_dst, addr0, sizeof(addr0)), 591 ifp->if_xname)); 592 goto bad; 593 } 594 595 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 596 if (nd_na == NULL) { 597 icmp6stat_inc(icp6s_tooshort); 598 if_put(ifp); 599 return; 600 } 601 taddr6 = nd_na->nd_na_target; 602 flags = nd_na->nd_na_flags_reserved; 603 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 604 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 605 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 606 607 if (IN6_IS_SCOPE_EMBED(&taddr6)) 608 taddr6.s6_addr16[1] = htons(ifp->if_index); 609 610 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 611 nd6log((LOG_ERR, 612 "nd6_na_input: invalid target address %s\n", 613 inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)))); 614 goto bad; 615 } 616 if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) { 617 nd6log((LOG_ERR, 618 "nd6_na_input: a solicited adv is multicasted\n")); 619 goto bad; 620 } 621 622 icmp6len -= sizeof(*nd_na); 623 if (nd6_options(nd_na + 1, icmp6len, &ndopts) < 0) { 624 nd6log((LOG_INFO, 625 "nd6_na_input: invalid ND option, ignored\n")); 626 /* nd6_options have incremented stats */ 627 goto freeit; 628 } 629 630 if (IN6_IS_ADDR_MULTICAST(&daddr6) && !ndopts.nd_opts_tgt_lladdr) { 631 nd6log((LOG_INFO, 632 "nd6_na_input: multicast adv without TLLA\n")); 633 goto bad; 634 } 635 636 if (ndopts.nd_opts_tgt_lladdr) { 637 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 638 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 639 } 640 641 ifa6 = in6ifa_ifpwithaddr(ifp, &taddr6); 642 ifa = ifa6 ? &ifa6->ia_ifa : NULL; 643 644 /* 645 * Target address matches one of my interface address. 646 * 647 * If my address is tentative, this means that there's somebody 648 * already using the same address as mine. This indicates DAD failure. 649 * This is defined in RFC 2462. 650 * 651 * Otherwise, process as defined in RFC 2461. 652 */ 653 if (ifa && (ifatoia6(ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 654 struct dadq *dp; 655 656 dp = nd6_dad_find(ifa); 657 if (dp) { 658 dp->dad_na_icount++; 659 660 /* remove the address. */ 661 nd6_dad_duplicated(dp); 662 } 663 goto freeit; 664 } 665 666 if (ifa) { 667 #if NCARP > 0 668 /* 669 * Ignore NAs silently for carp addresses if we're not 670 * the CARP master. 671 */ 672 if (ifp->if_type == IFT_CARP && !carp_iamatch(ifp)) 673 goto freeit; 674 #endif 675 log(LOG_ERR, 676 "nd6_na_input: duplicate IP6 address %s\n", 677 inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr))); 678 goto freeit; 679 } 680 681 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 682 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 683 "(if %d, NA packet %d)\n", 684 inet_ntop(AF_INET6, &taddr6, addr, sizeof(addr)), 685 ifp->if_addrlen, lladdrlen - 2)); 686 goto bad; 687 } 688 689 /* 690 * If no neighbor cache entry is found, NA SHOULD silently be 691 * discarded. 692 */ 693 rt = nd6_lookup(&taddr6, 0, ifp, ifp->if_rdomain); 694 if ((rt == NULL) || 695 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 696 ((sdl = satosdl(rt->rt_gateway)) == NULL)) 697 goto freeit; 698 699 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 700 /* 701 * If the link-layer has address, and no lladdr option came, 702 * discard the packet. 703 */ 704 if (ifp->if_addrlen && !lladdr) 705 goto freeit; 706 707 /* 708 * Record link-layer address, and update the state. 709 */ 710 sdl->sdl_alen = ifp->if_addrlen; 711 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 712 if (is_solicited) { 713 ln->ln_state = ND6_LLINFO_REACHABLE; 714 ln->ln_byhint = 0; 715 /* Notify userland that a new ND entry is reachable. */ 716 rtm_send(rt, RTM_RESOLVE, 0, ifp->if_rdomain); 717 if (!ND6_LLINFO_PERMANENT(ln)) { 718 nd6_llinfo_settimer(ln, 719 ifp->if_nd->reachable); 720 } 721 } else { 722 ln->ln_state = ND6_LLINFO_STALE; 723 nd6_llinfo_settimer(ln, nd6_gctimer); 724 } 725 if ((ln->ln_router = is_router) != 0) { 726 /* 727 * This means a router's state has changed from 728 * non-reachable to probably reachable, and might 729 * affect the status of associated prefixes.. 730 */ 731 if ((rt->rt_flags & RTF_LLINFO) == 0) 732 goto freeit; /* ln is gone */ 733 } 734 } else { 735 int llchange; 736 737 /* 738 * Check if the link-layer address has changed or not. 739 */ 740 if (!lladdr) 741 llchange = 0; 742 else { 743 if (sdl->sdl_alen) { 744 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 745 llchange = 1; 746 else 747 llchange = 0; 748 } else 749 llchange = 1; 750 } 751 752 /* 753 * This is VERY complex. Look at it with care. 754 * 755 * override solicit lladdr llchange action 756 * (L: record lladdr) 757 * 758 * 0 0 n -- (2c) 759 * 0 0 y n (2b) L 760 * 0 0 y y (1) REACHABLE->STALE 761 * 0 1 n -- (2c) *->REACHABLE 762 * 0 1 y n (2b) L *->REACHABLE 763 * 0 1 y y (1) REACHABLE->STALE 764 * 1 0 n -- (2a) 765 * 1 0 y n (2a) L 766 * 1 0 y y (2a) L *->STALE 767 * 1 1 n -- (2a) *->REACHABLE 768 * 1 1 y n (2a) L *->REACHABLE 769 * 1 1 y y (2a) L *->REACHABLE 770 */ 771 if (!is_override && (lladdr && llchange)) { /* (1) */ 772 /* 773 * If state is REACHABLE, make it STALE. 774 * no other updates should be done. 775 */ 776 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 777 ln->ln_state = ND6_LLINFO_STALE; 778 nd6_llinfo_settimer(ln, nd6_gctimer); 779 } 780 goto freeit; 781 } else if (is_override /* (2a) */ 782 || (!is_override && (lladdr && !llchange)) /* (2b) */ 783 || !lladdr) { /* (2c) */ 784 /* 785 * Update link-local address, if any. 786 */ 787 if (llchange) { 788 log(LOG_INFO, "ndp info overwritten for %s " 789 "by %s on %s\n", 790 inet_ntop(AF_INET6, &taddr6, 791 addr, sizeof(addr)), 792 ether_sprintf(lladdr), ifp->if_xname); 793 } 794 if (lladdr) { 795 sdl->sdl_alen = ifp->if_addrlen; 796 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 797 } 798 799 /* 800 * If solicited, make the state REACHABLE. 801 * If not solicited and the link-layer address was 802 * changed, make it STALE. 803 */ 804 if (is_solicited) { 805 ln->ln_state = ND6_LLINFO_REACHABLE; 806 ln->ln_byhint = 0; 807 if (!ND6_LLINFO_PERMANENT(ln)) { 808 nd6_llinfo_settimer(ln, 809 ifp->if_nd->reachable); 810 } 811 } else { 812 if (lladdr && llchange) { 813 ln->ln_state = ND6_LLINFO_STALE; 814 nd6_llinfo_settimer(ln, nd6_gctimer); 815 } 816 } 817 } 818 819 if (ln->ln_router && !is_router) { 820 if (!ip6_forwarding) { 821 /* 822 * The neighbor may be used 823 * as a next hop for some destinations 824 * (e.g. redirect case). So we must 825 * call rt6_flush explicitly. 826 */ 827 rt6_flush(&ip6->ip6_src, ifp); 828 } 829 } 830 ln->ln_router = is_router; 831 } 832 rt->rt_flags &= ~RTF_REJECT; 833 ln->ln_asked = 0; 834 if (ln->ln_hold) { 835 struct mbuf *n = ln->ln_hold; 836 ln->ln_hold = NULL; 837 /* 838 * we assume ifp is not a loopback here, so just set the 2nd 839 * argument as the 1st one. 840 */ 841 ifp->if_output(ifp, n, rt_key(rt), rt); 842 if (ln->ln_hold == n) { 843 /* n is back in ln_hold. Discard. */ 844 m_freem(ln->ln_hold); 845 ln->ln_hold = NULL; 846 } 847 } 848 849 freeit: 850 rtfree(rt); 851 m_freem(m); 852 if_put(ifp); 853 return; 854 855 bad: 856 icmp6stat_inc(icp6s_badna); 857 m_freem(m); 858 if_put(ifp); 859 } 860 861 /* 862 * Neighbor advertisement output handling. 863 * 864 * Based on RFC 2461 865 * 866 * the following items are not implemented yet: 867 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 868 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 869 * 870 * tlladdr - 1 if include target link-layer address 871 * sdl0 - sockaddr_dl (= proxy NA) or NULL 872 */ 873 void 874 nd6_na_output(struct ifnet *ifp, const struct in6_addr *daddr6, 875 const struct in6_addr *taddr6, u_long flags, int tlladdr, 876 struct sockaddr *sdl0) 877 { 878 struct mbuf *m; 879 struct rtentry *rt = NULL; 880 struct ip6_hdr *ip6; 881 struct nd_neighbor_advert *nd_na; 882 struct ip6_moptions im6o; 883 struct sockaddr_in6 dst_sa; 884 int icmp6len, maxlen; 885 caddr_t mac = NULL; 886 887 #if NCARP > 0 888 /* Do not send NAs for carp addresses if we're not the CARP master. */ 889 if (ifp->if_type == IFT_CARP && !carp_iamatch(ifp)) 890 return; 891 #endif 892 893 /* estimate the size of message */ 894 maxlen = sizeof(*ip6) + sizeof(*nd_na); 895 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 896 #ifdef DIAGNOSTIC 897 if (max_linkhdr + maxlen >= MCLBYTES) { 898 printf("%s: max_linkhdr + maxlen >= MCLBYTES " 899 "(%d + %d > %d)\n", __func__, max_linkhdr, maxlen, MCLBYTES); 900 panic("%s: insufficient MCLBYTES", __func__); 901 /* NOTREACHED */ 902 } 903 #endif 904 905 MGETHDR(m, M_DONTWAIT, MT_DATA); 906 if (m && max_linkhdr + maxlen >= MHLEN) { 907 MCLGET(m, M_DONTWAIT); 908 if ((m->m_flags & M_EXT) == 0) { 909 m_free(m); 910 m = NULL; 911 } 912 } 913 if (m == NULL) 914 return; 915 m->m_pkthdr.ph_rtableid = ifp->if_rdomain; 916 917 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 918 m->m_flags |= M_MCAST; 919 im6o.im6o_ifidx = ifp->if_index; 920 im6o.im6o_hlim = 255; 921 im6o.im6o_loop = 0; 922 } 923 924 icmp6len = sizeof(*nd_na); 925 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 926 m_align(m, maxlen); 927 928 /* fill neighbor advertisement packet */ 929 ip6 = mtod(m, struct ip6_hdr *); 930 ip6->ip6_flow = 0; 931 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 932 ip6->ip6_vfc |= IPV6_VERSION; 933 ip6->ip6_nxt = IPPROTO_ICMPV6; 934 ip6->ip6_hlim = 255; 935 bzero(&dst_sa, sizeof(dst_sa)); 936 dst_sa.sin6_len = sizeof(struct sockaddr_in6); 937 dst_sa.sin6_family = AF_INET6; 938 dst_sa.sin6_addr = *daddr6; 939 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 940 /* reply to DAD */ 941 dst_sa.sin6_addr.s6_addr16[0] = __IPV6_ADDR_INT16_MLL; 942 dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 943 dst_sa.sin6_addr.s6_addr32[1] = 0; 944 dst_sa.sin6_addr.s6_addr32[2] = 0; 945 dst_sa.sin6_addr.s6_addr32[3] = __IPV6_ADDR_INT32_ONE; 946 947 flags &= ~ND_NA_FLAG_SOLICITED; 948 } 949 ip6->ip6_dst = dst_sa.sin6_addr; 950 951 /* 952 * Select a source whose scope is the same as that of the dest. 953 */ 954 rt = rtalloc(sin6tosa(&dst_sa), RT_RESOLVE, ifp->if_rdomain); 955 if (!rtisvalid(rt)) { 956 char addr[INET6_ADDRSTRLEN]; 957 958 nd6log((LOG_DEBUG, "%s: source can't be determined: dst=%s\n", 959 __func__, inet_ntop(AF_INET6, &dst_sa.sin6_addr, addr, 960 sizeof(addr)))); 961 rtfree(rt); 962 goto bad; 963 } 964 ip6->ip6_src = ifatoia6(rt->rt_ifa)->ia_addr.sin6_addr; 965 rtfree(rt); 966 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 967 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 968 nd_na->nd_na_code = 0; 969 nd_na->nd_na_target = *taddr6; 970 if (IN6_IS_SCOPE_EMBED(&nd_na->nd_na_target)) 971 nd_na->nd_na_target.s6_addr16[1] = 0; 972 973 /* 974 * "tlladdr" indicates NS's condition for adding tlladdr or not. 975 * see nd6_ns_input() for details. 976 * Basically, if NS packet is sent to unicast/anycast addr, 977 * target lladdr option SHOULD NOT be included. 978 */ 979 if (tlladdr) { 980 /* 981 * sdl0 != NULL indicates proxy NA. If we do proxy, use 982 * lladdr in sdl0. If we are not proxying (sending NA for 983 * my address) use lladdr configured for the interface. 984 */ 985 if (sdl0 == NULL) { 986 mac = nd6_ifptomac(ifp); 987 } else if (sdl0->sa_family == AF_LINK) { 988 struct sockaddr_dl *sdl; 989 sdl = satosdl(sdl0); 990 if (sdl->sdl_alen == ifp->if_addrlen) 991 mac = LLADDR(sdl); 992 } 993 } 994 if (tlladdr && mac) { 995 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 996 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 997 998 /* roundup to 8 bytes alignment! */ 999 optlen = (optlen + 7) & ~7; 1000 1001 m->m_pkthdr.len += optlen; 1002 m->m_len += optlen; 1003 icmp6len += optlen; 1004 bzero((caddr_t)nd_opt, optlen); 1005 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 1006 nd_opt->nd_opt_len = optlen >> 3; 1007 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 1008 } else 1009 flags &= ~ND_NA_FLAG_OVERRIDE; 1010 1011 ip6->ip6_plen = htons((u_short)icmp6len); 1012 nd_na->nd_na_flags_reserved = flags; 1013 nd_na->nd_na_cksum = 0; 1014 m->m_pkthdr.csum_flags |= M_ICMP_CSUM_OUT; 1015 1016 ip6_output(m, NULL, NULL, 0, &im6o, NULL); 1017 icmp6stat_inc(icp6s_outhist + ND_NEIGHBOR_ADVERT); 1018 return; 1019 1020 bad: 1021 m_freem(m); 1022 } 1023 1024 caddr_t 1025 nd6_ifptomac(struct ifnet *ifp) 1026 { 1027 switch (ifp->if_type) { 1028 case IFT_ETHER: 1029 case IFT_IEEE1394: 1030 case IFT_PROPVIRTUAL: 1031 case IFT_CARP: 1032 case IFT_IEEE80211: 1033 return ((caddr_t)(ifp + 1)); 1034 default: 1035 return NULL; 1036 } 1037 } 1038 1039 struct dadq * 1040 nd6_dad_find(struct ifaddr *ifa) 1041 { 1042 struct dadq *dp; 1043 1044 TAILQ_FOREACH(dp, &dadq, dad_list) { 1045 if (dp->dad_ifa == ifa) 1046 return dp; 1047 } 1048 return NULL; 1049 } 1050 1051 void 1052 nd6_dad_destroy(struct dadq *dp) 1053 { 1054 TAILQ_REMOVE(&dadq, dp, dad_list); 1055 ifafree(dp->dad_ifa); 1056 free(dp, M_IP6NDP, sizeof(*dp)); 1057 ip6_dad_pending--; 1058 } 1059 1060 void 1061 nd6_dad_starttimer(struct dadq *dp) 1062 { 1063 timeout_set_proc(&dp->dad_timer_ch, nd6_dad_timer, dp->dad_ifa); 1064 timeout_add_msec(&dp->dad_timer_ch, RETRANS_TIMER); 1065 } 1066 1067 void 1068 nd6_dad_stoptimer(struct dadq *dp) 1069 { 1070 timeout_del(&dp->dad_timer_ch); 1071 } 1072 1073 /* 1074 * Start Duplicated Address Detection (DAD) for specified interface address. 1075 */ 1076 void 1077 nd6_dad_start(struct ifaddr *ifa) 1078 { 1079 struct in6_ifaddr *ia6 = ifatoia6(ifa); 1080 struct dadq *dp; 1081 char addr[INET6_ADDRSTRLEN]; 1082 1083 NET_ASSERT_LOCKED(); 1084 1085 /* 1086 * If we don't need DAD, don't do it. 1087 * There are several cases: 1088 * - DAD is disabled (ip6_dad_count == 0) 1089 * - the interface address is anycast 1090 */ 1091 KASSERT(ia6->ia6_flags & IN6_IFF_TENTATIVE); 1092 if ((ia6->ia6_flags & IN6_IFF_ANYCAST) || (!ip6_dad_count)) { 1093 ia6->ia6_flags &= ~IN6_IFF_TENTATIVE; 1094 1095 rtm_addr(RTM_CHGADDRATTR, ifa); 1096 1097 return; 1098 } 1099 1100 /* DAD already in progress */ 1101 if (nd6_dad_find(ifa) != NULL) 1102 return; 1103 1104 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT | M_ZERO); 1105 if (dp == NULL) { 1106 log(LOG_ERR, "%s: memory allocation failed for %s(%s)\n", 1107 __func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, 1108 addr, sizeof(addr)), 1109 ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???"); 1110 return; 1111 } 1112 1113 TAILQ_INSERT_TAIL(&dadq, dp, dad_list); 1114 ip6_dad_pending++; 1115 1116 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", ifa->ifa_ifp->if_xname, 1117 inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr)))); 1118 1119 /* 1120 * Send NS packet for DAD, ip6_dad_count times. 1121 * Note that we must delay the first transmission, if this is the 1122 * first packet to be sent from the interface after interface 1123 * (re)initialization. 1124 */ 1125 dp->dad_ifa = ifaref(ifa); 1126 dp->dad_count = ip6_dad_count; 1127 dp->dad_ns_icount = dp->dad_na_icount = 0; 1128 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1129 nd6_dad_ns_output(dp, ifa); 1130 nd6_dad_starttimer(dp); 1131 } 1132 1133 /* 1134 * terminate DAD unconditionally. used for address removals. 1135 */ 1136 void 1137 nd6_dad_stop(struct ifaddr *ifa) 1138 { 1139 struct dadq *dp; 1140 1141 dp = nd6_dad_find(ifa); 1142 if (!dp) { 1143 /* DAD wasn't started yet */ 1144 return; 1145 } 1146 1147 nd6_dad_stoptimer(dp); 1148 nd6_dad_destroy(dp); 1149 } 1150 1151 void 1152 nd6_dad_timer(void *xifa) 1153 { 1154 struct ifaddr *ifa = xifa; 1155 struct in6_ifaddr *ia6 = ifatoia6(ifa); 1156 struct dadq *dp; 1157 char addr[INET6_ADDRSTRLEN]; 1158 1159 NET_LOCK(); 1160 1161 /* Sanity check */ 1162 if (ia6 == NULL) { 1163 log(LOG_ERR, "%s: called with null parameter\n", __func__); 1164 goto done; 1165 } 1166 dp = nd6_dad_find(ifa); 1167 if (dp == NULL) { 1168 log(LOG_ERR, "%s: DAD structure not found\n", __func__); 1169 goto done; 1170 } 1171 if (ia6->ia6_flags & IN6_IFF_DUPLICATED) { 1172 log(LOG_ERR, "%s: called with duplicated address %s(%s)\n", 1173 __func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, 1174 addr, sizeof(addr)), 1175 ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???"); 1176 goto done; 1177 } 1178 if ((ia6->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1179 log(LOG_ERR, "%s: called with non-tentative address %s(%s)\n", 1180 __func__, inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, 1181 addr, sizeof(addr)), 1182 ifa->ifa_ifp ? ifa->ifa_ifp->if_xname : "???"); 1183 goto done; 1184 } 1185 1186 /* timeouted with IFF_{RUNNING,UP} check */ 1187 if (dp->dad_ns_tcount > dad_maxtry) { 1188 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1189 ifa->ifa_ifp->if_xname)); 1190 1191 nd6_dad_destroy(dp); 1192 goto done; 1193 } 1194 1195 /* Need more checks? */ 1196 if (dp->dad_ns_ocount < dp->dad_count) { 1197 /* 1198 * We have more NS to go. Send NS packet for DAD. 1199 */ 1200 nd6_dad_ns_output(dp, ifa); 1201 nd6_dad_starttimer(dp); 1202 } else { 1203 /* 1204 * We have transmitted sufficient number of DAD packets. 1205 */ 1206 if (dp->dad_na_icount || dp->dad_ns_icount) { 1207 /* dp will be freed in nd6_dad_duplicated() */ 1208 nd6_dad_duplicated(dp); 1209 } else { 1210 /* 1211 * We are done with DAD. No NA came, no NS came. 1212 */ 1213 ia6->ia6_flags &= ~IN6_IFF_TENTATIVE; 1214 1215 rtm_addr(RTM_CHGADDRATTR, ifa); 1216 1217 nd6log((LOG_DEBUG, 1218 "%s: DAD complete for %s - no duplicates found\n", 1219 ifa->ifa_ifp->if_xname, 1220 inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, 1221 addr, sizeof(addr)))); 1222 1223 nd6_dad_destroy(dp); 1224 } 1225 } 1226 1227 done: 1228 NET_UNLOCK(); 1229 } 1230 1231 void 1232 nd6_dad_duplicated(struct dadq *dp) 1233 { 1234 struct in6_ifaddr *ia6 = ifatoia6(dp->dad_ifa); 1235 char addr[INET6_ADDRSTRLEN]; 1236 1237 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1238 "NS in/out=%d/%d, NA in=%d\n", 1239 ia6->ia_ifp->if_xname, 1240 inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr)), 1241 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1242 1243 ia6->ia6_flags &= ~IN6_IFF_TENTATIVE; 1244 ia6->ia6_flags |= IN6_IFF_DUPLICATED; 1245 1246 /* We are done with DAD, with duplicated address found. (failure) */ 1247 nd6_dad_stoptimer(dp); 1248 1249 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1250 ia6->ia_ifp->if_xname, 1251 inet_ntop(AF_INET6, &ia6->ia_addr.sin6_addr, addr, sizeof(addr))); 1252 log(LOG_ERR, "%s: manual intervention required\n", 1253 ia6->ia_ifp->if_xname); 1254 1255 rtm_addr(RTM_CHGADDRATTR, dp->dad_ifa); 1256 1257 nd6_dad_destroy(dp); 1258 } 1259 1260 void 1261 nd6_dad_ns_output(struct dadq *dp, struct ifaddr *ifa) 1262 { 1263 struct in6_ifaddr *ia6 = ifatoia6(ifa); 1264 struct ifnet *ifp = ifa->ifa_ifp; 1265 1266 dp->dad_ns_tcount++; 1267 if ((ifp->if_flags & IFF_UP) == 0) { 1268 #if 0 1269 printf("%s: interface down?\n", ifp->if_xname); 1270 #endif 1271 return; 1272 } 1273 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1274 #if 0 1275 printf("%s: interface not running?\n", ifp->if_xname); 1276 #endif 1277 return; 1278 } 1279 1280 dp->dad_ns_ocount++; 1281 nd6_ns_output(ifp, NULL, &ia6->ia_addr.sin6_addr, NULL, 1); 1282 } 1283 1284 void 1285 nd6_dad_ns_input(struct ifaddr *ifa) 1286 { 1287 struct dadq *dp; 1288 1289 if (!ifa) 1290 panic("%s: ifa == NULL", __func__); 1291 1292 dp = nd6_dad_find(ifa); 1293 if (dp == NULL) { 1294 log(LOG_ERR, "%s: DAD structure not found\n", __func__); 1295 return; 1296 } 1297 1298 /* 1299 * if I'm yet to start DAD, someone else started using this address 1300 * first. I have a duplicate and you win. 1301 */ 1302 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1303 if (dp->dad_ns_ocount == 0) { 1304 /* dp will be freed in nd6_dad_duplicated() */ 1305 nd6_dad_duplicated(dp); 1306 } else { 1307 /* 1308 * not sure if I got a duplicate. 1309 * increment ns count and see what happens. 1310 */ 1311 dp->dad_ns_icount++; 1312 } 1313 } 1314 1315 /* 1316 * Check whether ``addr'' is a neighbor address connected to ``ifp''. 1317 */ 1318 int 1319 nd6_isneighbor(const struct ifnet *ifp, const struct in6_addr *addr) 1320 { 1321 struct rtentry *rt; 1322 struct sockaddr_in6 sin6; 1323 unsigned int tableid = ifp->if_rdomain; 1324 int rv = 0; 1325 1326 memset(&sin6, 0, sizeof(sin6)); 1327 sin6.sin6_len = sizeof(struct sockaddr_in6); 1328 sin6.sin6_family = AF_INET6; 1329 sin6.sin6_addr = *addr; 1330 rt = rtalloc(sin6tosa(&sin6), 0, tableid); 1331 1332 if (rtisvalid(rt) && ISSET(rt->rt_flags, RTF_CLONING|RTF_CLONED)) 1333 rv = if_isconnected(ifp, rt->rt_ifidx); 1334 1335 rtfree(rt); 1336 return (rv); 1337 }
Cache object: 570659b3dece0090bc62acb4cab06897
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