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sys/netinet6/nd6_nbr.c
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1 /* $NetBSD: nd6_nbr.c,v 1.56.2.1 2008/10/03 10:43:48 jdc 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 1.56.2.1 2008/10/03 10:43:48 jdc 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 router = ip6_forwarding; 109 int tlladdr; 110 union nd_opts ndopts; 111 struct sockaddr_dl *proxydl = NULL; 112 113 IP6_EXTHDR_GET(nd_ns, struct nd_neighbor_solicit *, m, off, icmp6len); 114 if (nd_ns == NULL) { 115 icmp6stat.icp6s_tooshort++; 116 return; 117 } 118 ip6 = mtod(m, struct ip6_hdr *); /* adjust pointer for safety */ 119 taddr6 = nd_ns->nd_ns_target; 120 121 if (ip6->ip6_hlim != 255) { 122 nd6log((LOG_ERR, 123 "nd6_ns_input: invalid hlim (%d) from %s to %s on %s\n", 124 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 125 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 126 goto bad; 127 } 128 129 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 130 /* dst has to be solicited node multicast address. */ 131 /* don't check ifindex portion */ 132 if (daddr6.s6_addr16[0] == IPV6_ADDR_INT16_MLL && 133 daddr6.s6_addr32[1] == 0 && 134 daddr6.s6_addr32[2] == IPV6_ADDR_INT32_ONE && 135 daddr6.s6_addr8[12] == 0xff) { 136 ; /* good */ 137 } else { 138 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 139 "(wrong ip6 dst)\n")); 140 goto bad; 141 } 142 } else { 143 /* 144 * Make sure the source address is from a neighbor's address. 145 */ 146 if (in6ifa_ifplocaladdr(ifp, &saddr6) == NULL) { 147 nd6log((LOG_INFO, "nd6_ns_input: " 148 "NS packet from non-neighbor\n")); 149 goto bad; 150 } 151 } 152 153 154 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 155 nd6log((LOG_INFO, "nd6_ns_input: bad NS target (multicast)\n")); 156 goto bad; 157 } 158 159 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 160 taddr6.s6_addr16[1] = htons(ifp->if_index); 161 162 icmp6len -= sizeof(*nd_ns); 163 nd6_option_init(nd_ns + 1, icmp6len, &ndopts); 164 if (nd6_options(&ndopts) < 0) { 165 nd6log((LOG_INFO, 166 "nd6_ns_input: invalid ND option, ignored\n")); 167 /* nd6_options have incremented stats */ 168 goto freeit; 169 } 170 171 if (ndopts.nd_opts_src_lladdr) { 172 lladdr = (char *)(ndopts.nd_opts_src_lladdr + 1); 173 lladdrlen = ndopts.nd_opts_src_lladdr->nd_opt_len << 3; 174 } 175 176 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && lladdr) { 177 nd6log((LOG_INFO, "nd6_ns_input: bad DAD packet " 178 "(link-layer address option)\n")); 179 goto bad; 180 } 181 182 /* 183 * Attaching target link-layer address to the NA? 184 * (RFC 2461 7.2.4) 185 * 186 * NS IP dst is unicast/anycast MUST NOT add 187 * NS IP dst is solicited-node multicast MUST add 188 * 189 * In implementation, we add target link-layer address by default. 190 * We do not add one in MUST NOT cases. 191 */ 192 #if 0 /* too much! */ 193 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &daddr6); 194 if (ifa && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)) 195 tlladdr = 0; 196 else 197 #endif 198 if (!IN6_IS_ADDR_MULTICAST(&daddr6)) 199 tlladdr = 0; 200 else 201 tlladdr = 1; 202 203 /* 204 * Target address (taddr6) must be either: 205 * (1) Valid unicast/anycast address for my receiving interface, 206 * (2) Unicast address for which I'm offering proxy service, or 207 * (3) "tentative" address on which DAD is being performed. 208 */ 209 /* (1) and (3) check. */ 210 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 211 212 /* (2) check. */ 213 if (!ifa) { 214 struct rtentry *rt; 215 struct sockaddr_in6 tsin6; 216 217 bzero(&tsin6, sizeof tsin6); 218 tsin6.sin6_len = sizeof(struct sockaddr_in6); 219 tsin6.sin6_family = AF_INET6; 220 tsin6.sin6_addr = taddr6; 221 222 rt = rtalloc1((struct sockaddr *)&tsin6, 0); 223 if (rt && (rt->rt_flags & RTF_ANNOUNCE) != 0 && 224 rt->rt_gateway->sa_family == AF_LINK) { 225 /* 226 * proxy NDP for single entry 227 */ 228 ifa = (struct ifaddr *)in6ifa_ifpforlinklocal(ifp, 229 IN6_IFF_NOTREADY|IN6_IFF_ANYCAST); 230 if (ifa) { 231 proxy = 1; 232 proxydl = SDL(rt->rt_gateway); 233 router = 0; /* XXX */ 234 } 235 } 236 if (rt) 237 rtfree(rt); 238 } 239 if (!ifa) { 240 /* 241 * We've got an NS packet, and we don't have that adddress 242 * assigned for us. We MUST silently ignore it. 243 * See RFC2461 7.2.3. 244 */ 245 goto freeit; 246 } 247 myaddr6 = *IFA_IN6(ifa); 248 anycast = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST; 249 tentative = ((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE; 250 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DUPLICATED) 251 goto freeit; 252 253 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 254 nd6log((LOG_INFO, "nd6_ns_input: lladdrlen mismatch for %s " 255 "(if %d, NS packet %d)\n", 256 ip6_sprintf(&taddr6), ifp->if_addrlen, lladdrlen - 2)); 257 goto bad; 258 } 259 260 if (IN6_ARE_ADDR_EQUAL(&myaddr6, &saddr6)) { 261 nd6log((LOG_INFO, "nd6_ns_input: duplicate IP6 address %s\n", 262 ip6_sprintf(&saddr6))); 263 goto freeit; 264 } 265 266 /* 267 * We have neighbor solicitation packet, with target address equals to 268 * one of my tentative address. 269 * 270 * src addr how to process? 271 * --- --- 272 * multicast of course, invalid (rejected in ip6_input) 273 * unicast somebody is doing address resolution -> ignore 274 * unspec dup address detection 275 * 276 * The processing is defined in RFC 2462. 277 */ 278 if (tentative) { 279 /* 280 * If source address is unspecified address, it is for 281 * duplicated address detection. 282 * 283 * If not, the packet is for addess resolution; 284 * silently ignore it. 285 */ 286 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) 287 nd6_dad_ns_input(ifa); 288 289 goto freeit; 290 } 291 292 /* 293 * If the source address is unspecified address, entries must not 294 * be created or updated. 295 * It looks that sender is performing DAD. Output NA toward 296 * all-node multicast address, to tell the sender that I'm using 297 * the address. 298 * S bit ("solicited") must be zero. 299 */ 300 if (IN6_IS_ADDR_UNSPECIFIED(&saddr6)) { 301 saddr6 = in6addr_linklocal_allnodes; 302 saddr6.s6_addr16[1] = htons(ifp->if_index); 303 nd6_na_output(ifp, &saddr6, &taddr6, 304 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 305 (router ? ND_NA_FLAG_ROUTER : 0), 306 tlladdr, (struct sockaddr *)proxydl); 307 goto freeit; 308 } 309 310 nd6_cache_lladdr(ifp, &saddr6, lladdr, lladdrlen, ND_NEIGHBOR_SOLICIT, 0); 311 312 nd6_na_output(ifp, &saddr6, &taddr6, 313 ((anycast || proxy || !tlladdr) ? 0 : ND_NA_FLAG_OVERRIDE) | 314 (router ? ND_NA_FLAG_ROUTER : 0) | ND_NA_FLAG_SOLICITED, 315 tlladdr, (struct sockaddr *)proxydl); 316 freeit: 317 m_freem(m); 318 return; 319 320 bad: 321 nd6log((LOG_ERR, "nd6_ns_input: src=%s\n", ip6_sprintf(&saddr6))); 322 nd6log((LOG_ERR, "nd6_ns_input: dst=%s\n", ip6_sprintf(&daddr6))); 323 nd6log((LOG_ERR, "nd6_ns_input: tgt=%s\n", ip6_sprintf(&taddr6))); 324 icmp6stat.icp6s_badns++; 325 m_freem(m); 326 } 327 328 /* 329 * Output an Neighbor Solicitation Message. Caller specifies: 330 * - ICMP6 header source IP6 address 331 * - ND6 header target IP6 address 332 * - ND6 header source datalink address 333 * 334 * Based on RFC 2461 335 * Based on RFC 2462 (duplicated address detection) 336 */ 337 void 338 nd6_ns_output(ifp, daddr6, taddr6, ln, dad) 339 struct ifnet *ifp; 340 const struct in6_addr *daddr6, *taddr6; 341 struct llinfo_nd6 *ln; /* for source address determination */ 342 int dad; /* duplicated address detection */ 343 { 344 struct mbuf *m; 345 struct ip6_hdr *ip6; 346 struct nd_neighbor_solicit *nd_ns; 347 struct sockaddr_in6 src_sa, dst_sa; 348 struct ip6_moptions im6o; 349 int icmp6len; 350 int maxlen; 351 caddr_t mac; 352 struct route_in6 ro; 353 354 bzero(&ro, sizeof(ro)); 355 356 if (IN6_IS_ADDR_MULTICAST(taddr6)) 357 return; 358 359 /* estimate the size of message */ 360 maxlen = sizeof(*ip6) + sizeof(*nd_ns); 361 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 362 #ifdef DIAGNOSTIC 363 if (max_linkhdr + maxlen >= MCLBYTES) { 364 printf("nd6_ns_output: max_linkhdr + maxlen >= MCLBYTES " 365 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 366 panic("nd6_ns_output: insufficient MCLBYTES"); 367 /* NOTREACHED */ 368 } 369 #endif 370 371 MGETHDR(m, M_DONTWAIT, MT_DATA); 372 if (m && max_linkhdr + maxlen >= MHLEN) { 373 MCLGET(m, M_DONTWAIT); 374 if ((m->m_flags & M_EXT) == 0) { 375 m_free(m); 376 m = NULL; 377 } 378 } 379 if (m == NULL) 380 return; 381 m->m_pkthdr.rcvif = NULL; 382 383 if (daddr6 == NULL || IN6_IS_ADDR_MULTICAST(daddr6)) { 384 m->m_flags |= M_MCAST; 385 im6o.im6o_multicast_ifp = ifp; 386 im6o.im6o_multicast_hlim = 255; 387 im6o.im6o_multicast_loop = 0; 388 } 389 390 icmp6len = sizeof(*nd_ns); 391 m->m_pkthdr.len = m->m_len = sizeof(*ip6) + icmp6len; 392 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 393 394 /* fill neighbor solicitation packet */ 395 ip6 = mtod(m, struct ip6_hdr *); 396 ip6->ip6_flow = 0; 397 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 398 ip6->ip6_vfc |= IPV6_VERSION; 399 /* ip6->ip6_plen will be set later */ 400 ip6->ip6_nxt = IPPROTO_ICMPV6; 401 ip6->ip6_hlim = 255; 402 /* determine the source and destination addresses */ 403 bzero(&src_sa, sizeof(src_sa)); 404 bzero(&dst_sa, sizeof(dst_sa)); 405 src_sa.sin6_family = dst_sa.sin6_family = AF_INET6; 406 src_sa.sin6_len = dst_sa.sin6_len = sizeof(struct sockaddr_in6); 407 if (daddr6) 408 dst_sa.sin6_addr = *daddr6; 409 else { 410 dst_sa.sin6_addr.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 411 dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 412 dst_sa.sin6_addr.s6_addr32[1] = 0; 413 dst_sa.sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_ONE; 414 dst_sa.sin6_addr.s6_addr32[3] = taddr6->s6_addr32[3]; 415 dst_sa.sin6_addr.s6_addr8[12] = 0xff; 416 } 417 ip6->ip6_dst = dst_sa.sin6_addr; 418 if (!dad) { 419 /* 420 * RFC2461 7.2.2: 421 * "If the source address of the packet prompting the 422 * solicitation is the same as one of the addresses assigned 423 * to the outgoing interface, that address SHOULD be placed 424 * in the IP Source Address of the outgoing solicitation. 425 * Otherwise, any one of the addresses assigned to the 426 * interface should be used." 427 * 428 * We use the source address for the prompting packet 429 * (saddr6), if: 430 * - saddr6 is given from the caller (by giving "ln"), and 431 * - saddr6 belongs to the outgoing interface. 432 * Otherwise, we perform the source address selection as usual. 433 */ 434 struct ip6_hdr *hip6; /* hold ip6 */ 435 struct in6_addr *saddr6; 436 437 if (ln && ln->ln_hold) { 438 hip6 = mtod(ln->ln_hold, struct ip6_hdr *); 439 /* XXX pullup? */ 440 if (sizeof(*hip6) < ln->ln_hold->m_len) 441 saddr6 = &hip6->ip6_src; 442 else 443 saddr6 = NULL; 444 } else 445 saddr6 = NULL; 446 if (saddr6 && in6ifa_ifpwithaddr(ifp, saddr6)) 447 src_sa.sin6_addr = *saddr6; 448 else { 449 struct in6_addr *src0; 450 int error; 451 452 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 453 src0 = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, 454 &error); 455 if (src0 == NULL) { 456 nd6log((LOG_DEBUG, 457 "nd6_ns_output: source can't be " 458 "determined: dst=%s, error=%d\n", 459 ip6_sprintf(&dst_sa.sin6_addr), error)); 460 goto bad; 461 } 462 src_sa.sin6_addr = *src0; 463 } 464 } else { 465 /* 466 * Source address for DAD packet must always be IPv6 467 * unspecified address. (0::0) 468 * We actually don't have to 0-clear the address (we did it 469 * above), but we do so here explicitly to make the intention 470 * clearer. 471 */ 472 bzero(&src_sa.sin6_addr, sizeof(src_sa.sin6_addr)); 473 } 474 ip6->ip6_src = src_sa.sin6_addr; 475 nd_ns = (struct nd_neighbor_solicit *)(ip6 + 1); 476 nd_ns->nd_ns_type = ND_NEIGHBOR_SOLICIT; 477 nd_ns->nd_ns_code = 0; 478 nd_ns->nd_ns_reserved = 0; 479 nd_ns->nd_ns_target = *taddr6; 480 481 if (IN6_IS_SCOPE_LINKLOCAL(&nd_ns->nd_ns_target)) 482 nd_ns->nd_ns_target.s6_addr16[1] = 0; 483 484 /* 485 * Add source link-layer address option. 486 * 487 * spec implementation 488 * --- --- 489 * DAD packet MUST NOT do not add the option 490 * there's no link layer address: 491 * impossible do not add the option 492 * there's link layer address: 493 * Multicast NS MUST add one add the option 494 * Unicast NS SHOULD add one add the option 495 */ 496 if (!dad && (mac = nd6_ifptomac(ifp))) { 497 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 498 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_ns + 1); 499 /* 8 byte alignments... */ 500 optlen = (optlen + 7) & ~7; 501 502 m->m_pkthdr.len += optlen; 503 m->m_len += optlen; 504 icmp6len += optlen; 505 bzero((caddr_t)nd_opt, optlen); 506 nd_opt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; 507 nd_opt->nd_opt_len = optlen >> 3; 508 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 509 } 510 511 ip6->ip6_plen = htons((u_int16_t)icmp6len); 512 nd_ns->nd_ns_cksum = 0; 513 nd_ns->nd_ns_cksum = 514 in6_cksum(m, IPPROTO_ICMPV6, sizeof(*ip6), icmp6len); 515 516 ip6_output(m, NULL, &ro, dad ? IPV6_UNSPECSRC : 0, 517 &im6o, (struct socket *)NULL, NULL); 518 icmp6_ifstat_inc(ifp, ifs6_out_msg); 519 icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); 520 icmp6stat.icp6s_outhist[ND_NEIGHBOR_SOLICIT]++; 521 522 if (ro.ro_rt) { /* we don't cache this route. */ 523 RTFREE(ro.ro_rt); 524 } 525 return; 526 527 bad: 528 if (ro.ro_rt) { 529 RTFREE(ro.ro_rt); 530 } 531 m_freem(m); 532 return; 533 } 534 535 /* 536 * Neighbor advertisement input handling. 537 * 538 * Based on RFC 2461 539 * Based on RFC 2462 (duplicated address detection) 540 * 541 * the following items are not implemented yet: 542 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 543 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 544 */ 545 void 546 nd6_na_input(m, off, icmp6len) 547 struct mbuf *m; 548 int off, icmp6len; 549 { 550 struct ifnet *ifp = m->m_pkthdr.rcvif; 551 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 552 struct nd_neighbor_advert *nd_na; 553 struct in6_addr saddr6 = ip6->ip6_src; 554 struct in6_addr daddr6 = ip6->ip6_dst; 555 struct in6_addr taddr6; 556 int flags; 557 int is_router; 558 int is_solicited; 559 int is_override; 560 char *lladdr = NULL; 561 int lladdrlen = 0; 562 struct ifaddr *ifa; 563 struct llinfo_nd6 *ln; 564 struct rtentry *rt; 565 struct sockaddr_dl *sdl; 566 union nd_opts ndopts; 567 568 if (ip6->ip6_hlim != 255) { 569 nd6log((LOG_ERR, 570 "nd6_na_input: invalid hlim (%d) from %s to %s on %s\n", 571 ip6->ip6_hlim, ip6_sprintf(&ip6->ip6_src), 572 ip6_sprintf(&ip6->ip6_dst), if_name(ifp))); 573 goto bad; 574 } 575 576 IP6_EXTHDR_GET(nd_na, struct nd_neighbor_advert *, m, off, icmp6len); 577 if (nd_na == NULL) { 578 icmp6stat.icp6s_tooshort++; 579 return; 580 } 581 taddr6 = nd_na->nd_na_target; 582 flags = nd_na->nd_na_flags_reserved; 583 is_router = ((flags & ND_NA_FLAG_ROUTER) != 0); 584 is_solicited = ((flags & ND_NA_FLAG_SOLICITED) != 0); 585 is_override = ((flags & ND_NA_FLAG_OVERRIDE) != 0); 586 587 if (IN6_IS_SCOPE_LINKLOCAL(&taddr6)) 588 taddr6.s6_addr16[1] = htons(ifp->if_index); 589 590 if (IN6_IS_ADDR_MULTICAST(&taddr6)) { 591 nd6log((LOG_ERR, 592 "nd6_na_input: invalid target address %s\n", 593 ip6_sprintf(&taddr6))); 594 goto bad; 595 } 596 if (is_solicited && IN6_IS_ADDR_MULTICAST(&daddr6)) { 597 nd6log((LOG_ERR, 598 "nd6_na_input: a solicited adv is multicasted\n")); 599 goto bad; 600 } 601 602 icmp6len -= sizeof(*nd_na); 603 nd6_option_init(nd_na + 1, icmp6len, &ndopts); 604 if (nd6_options(&ndopts) < 0) { 605 nd6log((LOG_INFO, 606 "nd6_na_input: invalid ND option, ignored\n")); 607 /* nd6_options have incremented stats */ 608 goto freeit; 609 } 610 611 if (ndopts.nd_opts_tgt_lladdr) { 612 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1); 613 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3; 614 } 615 616 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &taddr6); 617 618 /* 619 * Target address matches one of my interface address. 620 * 621 * If my address is tentative, this means that there's somebody 622 * already using the same address as mine. This indicates DAD failure. 623 * This is defined in RFC 2462. 624 * 625 * Otherwise, process as defined in RFC 2461. 626 */ 627 if (ifa 628 && (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_TENTATIVE)) { 629 nd6_dad_na_input(ifa); 630 goto freeit; 631 } 632 633 /* Just for safety, maybe unnecessary. */ 634 if (ifa) { 635 log(LOG_ERR, 636 "nd6_na_input: duplicate IP6 address %s\n", 637 ip6_sprintf(&taddr6)); 638 goto freeit; 639 } 640 /* 641 * Make sure the source address is from a neighbor's address. 642 */ 643 if (in6ifa_ifplocaladdr(ifp, &saddr6) == NULL) { 644 nd6log((LOG_INFO, "nd6_ns_input: " 645 "ND packet from non-neighbor\n")); 646 goto bad; 647 } 648 649 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) { 650 nd6log((LOG_INFO, "nd6_na_input: lladdrlen mismatch for %s " 651 "(if %d, NA packet %d)\n", ip6_sprintf(&taddr6), 652 ifp->if_addrlen, lladdrlen - 2)); 653 goto bad; 654 } 655 656 /* 657 * If no neighbor cache entry is found, NA SHOULD silently be 658 * discarded. 659 */ 660 rt = nd6_lookup(&taddr6, 0, ifp); 661 if ((rt == NULL) || 662 ((ln = (struct llinfo_nd6 *)rt->rt_llinfo) == NULL) || 663 ((sdl = SDL(rt->rt_gateway)) == NULL)) 664 goto freeit; 665 666 if (ln->ln_state == ND6_LLINFO_INCOMPLETE) { 667 /* 668 * If the link-layer has address, and no lladdr option came, 669 * discard the packet. 670 */ 671 if (ifp->if_addrlen && !lladdr) 672 goto freeit; 673 674 /* 675 * Record link-layer address, and update the state. 676 */ 677 sdl->sdl_alen = ifp->if_addrlen; 678 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 679 if (is_solicited) { 680 ln->ln_state = ND6_LLINFO_REACHABLE; 681 ln->ln_byhint = 0; 682 if (!ND6_LLINFO_PERMANENT(ln)) { 683 nd6_llinfo_settimer(ln, 684 (long)ND_IFINFO(rt->rt_ifp)->reachable * hz); 685 } 686 } else { 687 ln->ln_state = ND6_LLINFO_STALE; 688 nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 689 } 690 if ((ln->ln_router = is_router) != 0) { 691 /* 692 * This means a router's state has changed from 693 * non-reachable to probably reachable, and might 694 * affect the status of associated prefixes.. 695 */ 696 pfxlist_onlink_check(); 697 } 698 } else { 699 int llchange; 700 701 /* 702 * Check if the link-layer address has changed or not. 703 */ 704 if (!lladdr) 705 llchange = 0; 706 else { 707 if (sdl->sdl_alen) { 708 if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen)) 709 llchange = 1; 710 else 711 llchange = 0; 712 } else 713 llchange = 1; 714 } 715 716 /* 717 * This is VERY complex. Look at it with care. 718 * 719 * override solicit lladdr llchange action 720 * (L: record lladdr) 721 * 722 * 0 0 n -- (2c) 723 * 0 0 y n (2b) L 724 * 0 0 y y (1) REACHABLE->STALE 725 * 0 1 n -- (2c) *->REACHABLE 726 * 0 1 y n (2b) L *->REACHABLE 727 * 0 1 y y (1) REACHABLE->STALE 728 * 1 0 n -- (2a) 729 * 1 0 y n (2a) L 730 * 1 0 y y (2a) L *->STALE 731 * 1 1 n -- (2a) *->REACHABLE 732 * 1 1 y n (2a) L *->REACHABLE 733 * 1 1 y y (2a) L *->REACHABLE 734 */ 735 if (!is_override && (lladdr && llchange)) { /* (1) */ 736 /* 737 * If state is REACHABLE, make it STALE. 738 * no other updates should be done. 739 */ 740 if (ln->ln_state == ND6_LLINFO_REACHABLE) { 741 ln->ln_state = ND6_LLINFO_STALE; 742 nd6_llinfo_settimer(ln, (long)nd6_gctimer * hz); 743 } 744 goto freeit; 745 } else if (is_override /* (2a) */ 746 || (!is_override && (lladdr && !llchange)) /* (2b) */ 747 || !lladdr) { /* (2c) */ 748 /* 749 * Update link-local address, if any. 750 */ 751 if (lladdr) { 752 sdl->sdl_alen = ifp->if_addrlen; 753 bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen); 754 } 755 756 /* 757 * If solicited, make the state REACHABLE. 758 * If not solicited and the link-layer address was 759 * changed, make it STALE. 760 */ 761 if (is_solicited) { 762 ln->ln_state = ND6_LLINFO_REACHABLE; 763 ln->ln_byhint = 0; 764 if (!ND6_LLINFO_PERMANENT(ln)) { 765 nd6_llinfo_settimer(ln, 766 (long)ND_IFINFO(ifp)->reachable * hz); 767 } 768 } else { 769 if (lladdr && llchange) { 770 ln->ln_state = ND6_LLINFO_STALE; 771 nd6_llinfo_settimer(ln, 772 (long)nd6_gctimer * hz); 773 } 774 } 775 } 776 777 if (ln->ln_router && !is_router) { 778 /* 779 * The peer dropped the router flag. 780 * Remove the sender from the Default Router List and 781 * update the Destination Cache entries. 782 */ 783 struct nd_defrouter *dr; 784 struct in6_addr *in6; 785 int s; 786 787 in6 = &((struct sockaddr_in6 *)rt_key(rt))->sin6_addr; 788 789 /* 790 * Lock to protect the default router list. 791 * XXX: this might be unnecessary, since this function 792 * is only called under the network software interrupt 793 * context. However, we keep it just for safety. 794 */ 795 s = splsoftnet(); 796 dr = defrouter_lookup(in6, rt->rt_ifp); 797 if (dr) 798 defrtrlist_del(dr); 799 else if (!ip6_forwarding) { 800 /* 801 * Even if the neighbor is not in the default 802 * router list, the neighbor may be used 803 * as a next hop for some destinations 804 * (e.g. redirect case). So we must 805 * call rt6_flush explicitly. 806 */ 807 rt6_flush(&ip6->ip6_src, rt->rt_ifp); 808 } 809 splx(s); 810 } 811 ln->ln_router = is_router; 812 } 813 rt->rt_flags &= ~RTF_REJECT; 814 ln->ln_asked = 0; 815 if (ln->ln_hold) { 816 /* 817 * we assume ifp is not a loopback here, so just set the 2nd 818 * argument as the 1st one. 819 */ 820 nd6_output(ifp, ifp, ln->ln_hold, 821 (struct sockaddr_in6 *)rt_key(rt), rt); 822 ln->ln_hold = NULL; 823 } 824 825 freeit: 826 m_freem(m); 827 return; 828 829 bad: 830 icmp6stat.icp6s_badna++; 831 m_freem(m); 832 } 833 834 /* 835 * Neighbor advertisement output handling. 836 * 837 * Based on RFC 2461 838 * 839 * the following items are not implemented yet: 840 * - proxy advertisement delay rule (RFC2461 7.2.8, last paragraph, SHOULD) 841 * - anycast advertisement delay rule (RFC2461 7.2.7, SHOULD) 842 */ 843 void 844 nd6_na_output(ifp, daddr6, taddr6, flags, tlladdr, sdl0) 845 struct ifnet *ifp; 846 const struct in6_addr *daddr6, *taddr6; 847 u_long flags; 848 int tlladdr; /* 1 if include target link-layer address */ 849 struct sockaddr *sdl0; /* sockaddr_dl (= proxy NA) or NULL */ 850 { 851 struct mbuf *m; 852 struct ip6_hdr *ip6; 853 struct nd_neighbor_advert *nd_na; 854 struct ip6_moptions im6o; 855 struct sockaddr_in6 dst_sa; 856 struct in6_addr *src0; 857 int icmp6len, maxlen, error; 858 caddr_t mac; 859 struct route_in6 ro; 860 861 mac = NULL; 862 bzero(&ro, sizeof(ro)); 863 864 /* estimate the size of message */ 865 maxlen = sizeof(*ip6) + sizeof(*nd_na); 866 maxlen += (sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7; 867 #ifdef DIAGNOSTIC 868 if (max_linkhdr + maxlen >= MCLBYTES) { 869 printf("nd6_na_output: max_linkhdr + maxlen >= MCLBYTES " 870 "(%d + %d > %d)\n", max_linkhdr, maxlen, MCLBYTES); 871 panic("nd6_na_output: insufficient MCLBYTES"); 872 /* NOTREACHED */ 873 } 874 #endif 875 876 MGETHDR(m, M_DONTWAIT, MT_DATA); 877 if (m && max_linkhdr + maxlen >= MHLEN) { 878 MCLGET(m, M_DONTWAIT); 879 if ((m->m_flags & M_EXT) == 0) { 880 m_free(m); 881 m = NULL; 882 } 883 } 884 if (m == NULL) 885 return; 886 m->m_pkthdr.rcvif = NULL; 887 888 if (IN6_IS_ADDR_MULTICAST(daddr6)) { 889 m->m_flags |= M_MCAST; 890 im6o.im6o_multicast_ifp = ifp; 891 im6o.im6o_multicast_hlim = 255; 892 im6o.im6o_multicast_loop = 0; 893 } 894 895 icmp6len = sizeof(*nd_na); 896 m->m_pkthdr.len = m->m_len = sizeof(struct ip6_hdr) + icmp6len; 897 m->m_data += max_linkhdr; /* or MH_ALIGN() equivalent? */ 898 899 /* fill neighbor advertisement packet */ 900 ip6 = mtod(m, struct ip6_hdr *); 901 ip6->ip6_flow = 0; 902 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 903 ip6->ip6_vfc |= IPV6_VERSION; 904 ip6->ip6_nxt = IPPROTO_ICMPV6; 905 ip6->ip6_hlim = 255; 906 bzero(&dst_sa, sizeof(dst_sa)); 907 dst_sa.sin6_len = sizeof(struct sockaddr_in6); 908 dst_sa.sin6_family = AF_INET6; 909 dst_sa.sin6_addr = *daddr6; 910 if (IN6_IS_ADDR_UNSPECIFIED(daddr6)) { 911 /* reply to DAD */ 912 dst_sa.sin6_addr.s6_addr16[0] = IPV6_ADDR_INT16_MLL; 913 dst_sa.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 914 dst_sa.sin6_addr.s6_addr32[1] = 0; 915 dst_sa.sin6_addr.s6_addr32[2] = 0; 916 dst_sa.sin6_addr.s6_addr32[3] = IPV6_ADDR_INT32_ONE; 917 918 flags &= ~ND_NA_FLAG_SOLICITED; 919 } 920 ip6->ip6_dst = dst_sa.sin6_addr; 921 922 /* 923 * Select a source whose scope is the same as that of the dest. 924 */ 925 bcopy(&dst_sa, &ro.ro_dst, sizeof(dst_sa)); 926 src0 = in6_selectsrc(&dst_sa, NULL, NULL, &ro, NULL, &error); 927 if (src0 == NULL) { 928 nd6log((LOG_DEBUG, "nd6_na_output: source can't be " 929 "determined: dst=%s, error=%d\n", 930 ip6_sprintf(&dst_sa.sin6_addr), error)); 931 goto bad; 932 } 933 ip6->ip6_src = *src0; 934 nd_na = (struct nd_neighbor_advert *)(ip6 + 1); 935 nd_na->nd_na_type = ND_NEIGHBOR_ADVERT; 936 nd_na->nd_na_code = 0; 937 nd_na->nd_na_target = *taddr6; 938 if (IN6_IS_SCOPE_LINKLOCAL(&nd_na->nd_na_target)) 939 nd_na->nd_na_target.s6_addr16[1] = 0; 940 941 /* 942 * "tlladdr" indicates NS's condition for adding tlladdr or not. 943 * see nd6_ns_input() for details. 944 * Basically, if NS packet is sent to unicast/anycast addr, 945 * target lladdr option SHOULD NOT be included. 946 */ 947 if (tlladdr) { 948 /* 949 * sdl0 != NULL indicates proxy NA. If we do proxy, use 950 * lladdr in sdl0. If we are not proxying (sending NA for 951 * my address) use lladdr configured for the interface. 952 */ 953 if (sdl0 == NULL) 954 mac = nd6_ifptomac(ifp); 955 else if (sdl0->sa_family == AF_LINK) { 956 struct sockaddr_dl *sdl; 957 sdl = (struct sockaddr_dl *)sdl0; 958 if (sdl->sdl_alen == ifp->if_addrlen) 959 mac = LLADDR(sdl); 960 } 961 } 962 if (tlladdr && mac) { 963 int optlen = sizeof(struct nd_opt_hdr) + ifp->if_addrlen; 964 struct nd_opt_hdr *nd_opt = (struct nd_opt_hdr *)(nd_na + 1); 965 966 /* roundup to 8 bytes alignment! */ 967 optlen = (optlen + 7) & ~7; 968 969 m->m_pkthdr.len += optlen; 970 m->m_len += optlen; 971 icmp6len += optlen; 972 bzero((caddr_t)nd_opt, optlen); 973 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR; 974 nd_opt->nd_opt_len = optlen >> 3; 975 bcopy(mac, (caddr_t)(nd_opt + 1), ifp->if_addrlen); 976 } else 977 flags &= ~ND_NA_FLAG_OVERRIDE; 978 979 ip6->ip6_plen = htons((u_int16_t)icmp6len); 980 nd_na->nd_na_flags_reserved = flags; 981 nd_na->nd_na_cksum = 0; 982 nd_na->nd_na_cksum = 983 in6_cksum(m, IPPROTO_ICMPV6, sizeof(struct ip6_hdr), icmp6len); 984 985 ip6_output(m, NULL, NULL, 0, &im6o, (struct socket *)NULL, NULL); 986 987 icmp6_ifstat_inc(ifp, ifs6_out_msg); 988 icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); 989 icmp6stat.icp6s_outhist[ND_NEIGHBOR_ADVERT]++; 990 991 if (ro.ro_rt) { /* we don't cache this route. */ 992 RTFREE(ro.ro_rt); 993 } 994 return; 995 996 bad: 997 if (ro.ro_rt) { 998 RTFREE(ro.ro_rt); 999 } 1000 m_freem(m); 1001 return; 1002 } 1003 1004 caddr_t 1005 nd6_ifptomac(ifp) 1006 struct ifnet *ifp; 1007 { 1008 switch (ifp->if_type) { 1009 case IFT_ARCNET: 1010 case IFT_ETHER: 1011 case IFT_FDDI: 1012 case IFT_IEEE1394: 1013 case IFT_PROPVIRTUAL: 1014 case IFT_L2VLAN: 1015 case IFT_IEEE80211: 1016 return LLADDR(ifp->if_sadl); 1017 default: 1018 return NULL; 1019 } 1020 } 1021 1022 TAILQ_HEAD(dadq_head, dadq); 1023 struct dadq { 1024 TAILQ_ENTRY(dadq) dad_list; 1025 struct ifaddr *dad_ifa; 1026 int dad_count; /* max NS to send */ 1027 int dad_ns_tcount; /* # of trials to send NS */ 1028 int dad_ns_ocount; /* NS sent so far */ 1029 int dad_ns_icount; 1030 int dad_na_icount; 1031 struct callout dad_timer_ch; 1032 }; 1033 1034 static struct dadq_head dadq; 1035 static int dad_init = 0; 1036 1037 static struct dadq * 1038 nd6_dad_find(ifa) 1039 struct ifaddr *ifa; 1040 { 1041 struct dadq *dp; 1042 1043 for (dp = dadq.tqh_first; dp; dp = dp->dad_list.tqe_next) { 1044 if (dp->dad_ifa == ifa) 1045 return dp; 1046 } 1047 return NULL; 1048 } 1049 1050 static void 1051 nd6_dad_starttimer(dp, ticks) 1052 struct dadq *dp; 1053 int ticks; 1054 { 1055 1056 callout_reset(&dp->dad_timer_ch, ticks, 1057 (void (*) __P((void *)))nd6_dad_timer, (void *)dp->dad_ifa); 1058 } 1059 1060 static void 1061 nd6_dad_stoptimer(dp) 1062 struct dadq *dp; 1063 { 1064 1065 callout_stop(&dp->dad_timer_ch); 1066 } 1067 1068 /* 1069 * Start Duplicated Address Detection (DAD) for specified interface address. 1070 */ 1071 void 1072 nd6_dad_start(ifa, tick) 1073 struct ifaddr *ifa; 1074 int *tick; /* minimum delay ticks for IFF_UP event */ 1075 { 1076 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1077 struct dadq *dp; 1078 1079 if (!dad_init) { 1080 TAILQ_INIT(&dadq); 1081 dad_init++; 1082 } 1083 1084 /* 1085 * If we don't need DAD, don't do it. 1086 * There are several cases: 1087 * - DAD is disabled (ip6_dad_count == 0) 1088 * - the interface address is anycast 1089 */ 1090 if (!(ia->ia6_flags & IN6_IFF_TENTATIVE)) { 1091 log(LOG_DEBUG, 1092 "nd6_dad_start: called with non-tentative address " 1093 "%s(%s)\n", 1094 ip6_sprintf(&ia->ia_addr.sin6_addr), 1095 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1096 return; 1097 } 1098 if (ia->ia6_flags & IN6_IFF_ANYCAST) { 1099 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1100 return; 1101 } 1102 if (!ip6_dad_count) { 1103 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1104 return; 1105 } 1106 if (!ifa->ifa_ifp) 1107 panic("nd6_dad_start: ifa->ifa_ifp == NULL"); 1108 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1109 return; 1110 if (nd6_dad_find(ifa) != NULL) { 1111 /* DAD already in progress */ 1112 return; 1113 } 1114 1115 dp = malloc(sizeof(*dp), M_IP6NDP, M_NOWAIT); 1116 if (dp == NULL) { 1117 log(LOG_ERR, "nd6_dad_start: memory allocation failed for " 1118 "%s(%s)\n", 1119 ip6_sprintf(&ia->ia_addr.sin6_addr), 1120 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1121 return; 1122 } 1123 bzero(dp, sizeof(*dp)); 1124 callout_init(&dp->dad_timer_ch); 1125 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1126 1127 nd6log((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1128 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1129 1130 /* 1131 * Send NS packet for DAD, ip6_dad_count times. 1132 * Note that we must delay the first transmission, if this is the 1133 * first packet to be sent from the interface after interface 1134 * (re)initialization. 1135 */ 1136 dp->dad_ifa = ifa; 1137 IFAREF(ifa); /* just for safety */ 1138 dp->dad_count = ip6_dad_count; 1139 dp->dad_ns_icount = dp->dad_na_icount = 0; 1140 dp->dad_ns_ocount = dp->dad_ns_tcount = 0; 1141 if (tick == NULL) { 1142 nd6_dad_ns_output(dp, ifa); 1143 nd6_dad_starttimer(dp, 1144 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1145 } else { 1146 int ntick; 1147 1148 if (*tick == 0) 1149 ntick = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz); 1150 else 1151 ntick = *tick + arc4random() % (hz / 2); 1152 *tick = ntick; 1153 nd6_dad_starttimer(dp, ntick); 1154 } 1155 } 1156 1157 /* 1158 * terminate DAD unconditionally. used for address removals. 1159 */ 1160 void 1161 nd6_dad_stop(ifa) 1162 struct ifaddr *ifa; 1163 { 1164 struct dadq *dp; 1165 1166 if (!dad_init) 1167 return; 1168 dp = nd6_dad_find(ifa); 1169 if (!dp) { 1170 /* DAD wasn't started yet */ 1171 return; 1172 } 1173 1174 nd6_dad_stoptimer(dp); 1175 1176 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1177 free(dp, M_IP6NDP); 1178 dp = NULL; 1179 IFAFREE(ifa); 1180 } 1181 1182 static void 1183 nd6_dad_timer(ifa) 1184 struct ifaddr *ifa; 1185 { 1186 int s; 1187 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1188 struct dadq *dp; 1189 1190 s = splsoftnet(); /* XXX */ 1191 1192 /* Sanity check */ 1193 if (ia == NULL) { 1194 log(LOG_ERR, "nd6_dad_timer: called with null parameter\n"); 1195 goto done; 1196 } 1197 dp = nd6_dad_find(ifa); 1198 if (dp == NULL) { 1199 log(LOG_ERR, "nd6_dad_timer: DAD structure not found\n"); 1200 goto done; 1201 } 1202 if (ia->ia6_flags & IN6_IFF_DUPLICATED) { 1203 log(LOG_ERR, "nd6_dad_timer: called with duplicated address " 1204 "%s(%s)\n", 1205 ip6_sprintf(&ia->ia_addr.sin6_addr), 1206 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1207 goto done; 1208 } 1209 if ((ia->ia6_flags & IN6_IFF_TENTATIVE) == 0) { 1210 log(LOG_ERR, "nd6_dad_timer: called with non-tentative address " 1211 "%s(%s)\n", 1212 ip6_sprintf(&ia->ia_addr.sin6_addr), 1213 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1214 goto done; 1215 } 1216 1217 /* timeouted with IFF_{RUNNING,UP} check */ 1218 if (dp->dad_ns_tcount > dad_maxtry) { 1219 nd6log((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1220 if_name(ifa->ifa_ifp))); 1221 1222 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1223 free(dp, M_IP6NDP); 1224 dp = NULL; 1225 IFAFREE(ifa); 1226 goto done; 1227 } 1228 1229 /* Need more checks? */ 1230 if (dp->dad_ns_ocount < dp->dad_count) { 1231 /* 1232 * We have more NS to go. Send NS packet for DAD. 1233 */ 1234 nd6_dad_ns_output(dp, ifa); 1235 nd6_dad_starttimer(dp, 1236 (long)ND_IFINFO(ifa->ifa_ifp)->retrans * hz / 1000); 1237 } else { 1238 /* 1239 * We have transmitted sufficient number of DAD packets. 1240 * See what we've got. 1241 */ 1242 int duplicate; 1243 1244 duplicate = 0; 1245 1246 if (dp->dad_na_icount) { 1247 /* 1248 * the check is in nd6_dad_na_input(), 1249 * but just in case 1250 */ 1251 duplicate++; 1252 } 1253 1254 if (dp->dad_ns_icount) { 1255 /* We've seen NS, means DAD has failed. */ 1256 duplicate++; 1257 } 1258 1259 if (duplicate) { 1260 /* (*dp) will be freed in nd6_dad_duplicated() */ 1261 dp = NULL; 1262 nd6_dad_duplicated(ifa); 1263 } else { 1264 /* 1265 * We are done with DAD. No NA came, no NS came. 1266 * duplicated address found. 1267 */ 1268 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1269 1270 nd6log((LOG_DEBUG, 1271 "%s: DAD complete for %s - no duplicates found\n", 1272 if_name(ifa->ifa_ifp), 1273 ip6_sprintf(&ia->ia_addr.sin6_addr))); 1274 1275 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1276 free(dp, M_IP6NDP); 1277 dp = NULL; 1278 IFAFREE(ifa); 1279 } 1280 } 1281 1282 done: 1283 splx(s); 1284 } 1285 1286 void 1287 nd6_dad_duplicated(ifa) 1288 struct ifaddr *ifa; 1289 { 1290 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1291 struct dadq *dp; 1292 1293 dp = nd6_dad_find(ifa); 1294 if (dp == NULL) { 1295 log(LOG_ERR, "nd6_dad_duplicated: DAD structure not found\n"); 1296 return; 1297 } 1298 1299 log(LOG_ERR, "%s: DAD detected duplicate IPv6 address %s: " 1300 "NS in/out=%d/%d, NA in=%d\n", 1301 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr), 1302 dp->dad_ns_icount, dp->dad_ns_ocount, dp->dad_na_icount); 1303 1304 ia->ia6_flags &= ~IN6_IFF_TENTATIVE; 1305 ia->ia6_flags |= IN6_IFF_DUPLICATED; 1306 1307 /* We are done with DAD, with duplicated address found. (failure) */ 1308 nd6_dad_stoptimer(dp); 1309 1310 log(LOG_ERR, "%s: DAD complete for %s - duplicate found\n", 1311 if_name(ifa->ifa_ifp), ip6_sprintf(&ia->ia_addr.sin6_addr)); 1312 log(LOG_ERR, "%s: manual intervention required\n", 1313 if_name(ifa->ifa_ifp)); 1314 1315 TAILQ_REMOVE(&dadq, (struct dadq *)dp, dad_list); 1316 free(dp, M_IP6NDP); 1317 dp = NULL; 1318 IFAFREE(ifa); 1319 } 1320 1321 static void 1322 nd6_dad_ns_output(dp, ifa) 1323 struct dadq *dp; 1324 struct ifaddr *ifa; 1325 { 1326 struct in6_ifaddr *ia = (struct in6_ifaddr *)ifa; 1327 struct ifnet *ifp = ifa->ifa_ifp; 1328 1329 dp->dad_ns_tcount++; 1330 if ((ifp->if_flags & IFF_UP) == 0) { 1331 #if 0 1332 printf("%s: interface down?\n", if_name(ifp)); 1333 #endif 1334 return; 1335 } 1336 if ((ifp->if_flags & IFF_RUNNING) == 0) { 1337 #if 0 1338 printf("%s: interface not running?\n", if_name(ifp)); 1339 #endif 1340 return; 1341 } 1342 1343 dp->dad_ns_ocount++; 1344 nd6_ns_output(ifp, NULL, &ia->ia_addr.sin6_addr, NULL, 1); 1345 } 1346 1347 static void 1348 nd6_dad_ns_input(ifa) 1349 struct ifaddr *ifa; 1350 { 1351 struct in6_ifaddr *ia; 1352 const struct in6_addr *taddr6; 1353 struct dadq *dp; 1354 int duplicate; 1355 1356 if (!ifa) 1357 panic("ifa == NULL in nd6_dad_ns_input"); 1358 1359 ia = (struct in6_ifaddr *)ifa; 1360 taddr6 = &ia->ia_addr.sin6_addr; 1361 duplicate = 0; 1362 dp = nd6_dad_find(ifa); 1363 1364 /* Quickhack - completely ignore DAD NS packets */ 1365 if (dad_ignore_ns) { 1366 nd6log((LOG_INFO, 1367 "nd6_dad_ns_input: ignoring DAD NS packet for " 1368 "address %s(%s)\n", ip6_sprintf(taddr6), 1369 if_name(ifa->ifa_ifp))); 1370 return; 1371 } 1372 1373 /* 1374 * if I'm yet to start DAD, someone else started using this address 1375 * first. I have a duplicate and you win. 1376 */ 1377 if (!dp || dp->dad_ns_ocount == 0) 1378 duplicate++; 1379 1380 /* XXX more checks for loopback situation - see nd6_dad_timer too */ 1381 1382 if (duplicate) { 1383 dp = NULL; /* will be freed in nd6_dad_duplicated() */ 1384 nd6_dad_duplicated(ifa); 1385 } else { 1386 /* 1387 * not sure if I got a duplicate. 1388 * increment ns count and see what happens. 1389 */ 1390 if (dp) 1391 dp->dad_ns_icount++; 1392 } 1393 } 1394 1395 static void 1396 nd6_dad_na_input(ifa) 1397 struct ifaddr *ifa; 1398 { 1399 struct dadq *dp; 1400 1401 if (!ifa) 1402 panic("ifa == NULL in nd6_dad_na_input"); 1403 1404 dp = nd6_dad_find(ifa); 1405 if (dp) 1406 dp->dad_na_icount++; 1407 1408 /* remove the address. */ 1409 nd6_dad_duplicated(ifa); 1410 }
Cache object: 608e7a72c113886bde810b83de434f71
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