in6_ifattach.c revision 1.78
1/* $OpenBSD: in6_ifattach.c,v 1.78 2014/12/04 00:02:15 tedu Exp $ */ 2/* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 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/socket.h> 36#include <sys/sockio.h> 37#include <sys/kernel.h> 38#include <sys/syslog.h> 39 40#include <crypto/sha2.h> 41 42#include <net/if.h> 43#include <net/if_var.h> 44#include <net/if_dl.h> 45#include <net/if_types.h> 46#include <net/route.h> 47 48#include <netinet/in.h> 49#include <netinet/if_ether.h> 50 51#include <netinet6/in6_var.h> 52#include <netinet/ip6.h> 53#include <netinet6/ip6_var.h> 54#include <netinet6/in6_ifattach.h> 55#include <netinet6/nd6.h> 56#ifdef MROUTING 57#include <netinet6/ip6_mroute.h> 58#endif 59 60int ip6_auto_linklocal = 1; /* enable by default */ 61 62int get_last_resort_ifid(struct ifnet *, struct in6_addr *); 63int get_hw_ifid(struct ifnet *, struct in6_addr *); 64int get_ifid(struct ifnet *, struct in6_addr *); 65int in6_ifattach_loopback(struct ifnet *); 66 67#define EUI64_GBIT 0x01 68#define EUI64_UBIT 0x02 69#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 70#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 71#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 72#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 73#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 74 75#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 76#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 77 78/* 79 * Generate a last-resort interface identifier, when the machine has no 80 * IEEE802/EUI64 address sources. 81 * The goal here is to get an interface identifier that is 82 * (1) random enough and (2) does not change across reboot. 83 * We currently use SHA512(hostname) for it. 84 * 85 * in6 - upper 64bits are preserved 86 */ 87int 88get_last_resort_ifid(struct ifnet *ifp, struct in6_addr *in6) 89{ 90 SHA2_CTX ctx; 91 u_int8_t digest[SHA512_DIGEST_LENGTH]; 92 93#if 0 94 /* we need at least several letters as seed for ifid */ 95 if (hostnamelen < 3) 96 return -1; 97#endif 98 99 /* generate 8 bytes of pseudo-random value. */ 100 SHA512Init(&ctx); 101 SHA512Update(&ctx, hostname, hostnamelen); 102 SHA512Final(digest, &ctx); 103 104 /* assumes sizeof(digest) > sizeof(ifid) */ 105 bcopy(digest, &in6->s6_addr[8], 8); 106 107 /* make sure to set "u" bit to local, and "g" bit to individual. */ 108 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 109 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 110 111 /* convert EUI64 into IPv6 interface identifier */ 112 EUI64_TO_IFID(in6); 113 114 return 0; 115} 116 117/* 118 * Generate a random interface identifier. 119 * 120 * in6 - upper 64bits are preserved 121 */ 122void 123in6_get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 124{ 125 arc4random_buf(&in6->s6_addr32[2], 8); 126 127 /* make sure to set "u" bit to local, and "g" bit to individual. */ 128 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 129 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 130 131 /* convert EUI64 into IPv6 interface identifier */ 132 EUI64_TO_IFID(in6); 133} 134 135/* 136 * Get interface identifier for the specified interface. 137 * 138 * in6 - upper 64bits are preserved 139 */ 140int 141get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 142{ 143 struct sockaddr_dl *sdl; 144 char *addr; 145 size_t addrlen; 146 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 147 static u_int8_t allone[8] = 148 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 149 150 sdl = (struct sockaddr_dl *)ifp->if_sadl; 151 if (sdl == NULL || sdl->sdl_alen == 0) 152 return -1; 153 154 addr = LLADDR(sdl); 155 addrlen = sdl->sdl_alen; 156 157 switch (ifp->if_type) { 158 case IFT_IEEE1394: 159 case IFT_IEEE80211: 160 /* IEEE1394 uses 16byte length address starting with EUI64 */ 161 if (addrlen > 8) 162 addrlen = 8; 163 break; 164 default: 165 break; 166 } 167 168 /* get EUI64 */ 169 switch (ifp->if_type) { 170 /* IEEE802/EUI64 cases - what others? */ 171 case IFT_ETHER: 172 case IFT_CARP: 173 case IFT_IEEE1394: 174 case IFT_IEEE80211: 175 /* look at IEEE802/EUI64 only */ 176 if (addrlen != 8 && addrlen != 6) 177 return -1; 178 179 /* 180 * check for invalid MAC address - on bsdi, we see it a lot 181 * since wildboar configures all-zero MAC on pccard before 182 * card insertion. 183 */ 184 if (bcmp(addr, allzero, addrlen) == 0) 185 return -1; 186 if (bcmp(addr, allone, addrlen) == 0) 187 return -1; 188 189 /* make EUI64 address */ 190 if (addrlen == 8) 191 bcopy(addr, &in6->s6_addr[8], 8); 192 else if (addrlen == 6) { 193 in6->s6_addr[8] = addr[0]; 194 in6->s6_addr[9] = addr[1]; 195 in6->s6_addr[10] = addr[2]; 196 in6->s6_addr[11] = 0xff; 197 in6->s6_addr[12] = 0xfe; 198 in6->s6_addr[13] = addr[3]; 199 in6->s6_addr[14] = addr[4]; 200 in6->s6_addr[15] = addr[5]; 201 } 202 break; 203 204 case IFT_GIF: 205 /* 206 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 207 * however, IPv4 address is not very suitable as unique 208 * identifier source (can be renumbered). 209 * we don't do this. 210 */ 211 return -1; 212 213 default: 214 return -1; 215 } 216 217 /* sanity check: g bit must not indicate "group" */ 218 if (EUI64_GROUP(in6)) 219 return -1; 220 221 /* convert EUI64 into IPv6 interface identifier */ 222 EUI64_TO_IFID(in6); 223 224 /* 225 * sanity check: ifid must not be all zero, avoid conflict with 226 * subnet router anycast 227 */ 228 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 229 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 230 return -1; 231 } 232 233 return 0; 234} 235 236/* 237 * Get interface identifier for the specified interface. If it is not 238 * available on ifp0, borrow interface identifier from other information 239 * sources. 240 */ 241int 242get_ifid(struct ifnet *ifp0, struct in6_addr *in6) 243{ 244 struct ifnet *ifp; 245 246 /* first, try to get it from the interface itself */ 247 if (get_hw_ifid(ifp0, in6) == 0) { 248 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 249 ifp0->if_xname)); 250 goto success; 251 } 252 253 /* next, try to get it from some other hardware interface */ 254 TAILQ_FOREACH(ifp, &ifnet, if_list) { 255 if (ifp == ifp0) 256 continue; 257 if (get_hw_ifid(ifp, in6) != 0) 258 continue; 259 260 /* 261 * to borrow ifid from other interface, ifid needs to be 262 * globally unique 263 */ 264 if (IFID_UNIVERSAL(in6)) { 265 nd6log((LOG_DEBUG, 266 "%s: borrow interface identifier from %s\n", 267 ifp0->if_xname, ifp->if_xname)); 268 goto success; 269 } 270 } 271 272 /* last resort: get from random number source */ 273 if (get_last_resort_ifid(ifp, in6) == 0) { 274 nd6log((LOG_DEBUG, 275 "%s: interface identifier generated by random number\n", 276 ifp0->if_xname)); 277 goto success; 278 } 279 280 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 281 return -1; 282 283success: 284 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 285 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 286 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 287 in6->s6_addr[14], in6->s6_addr[15])); 288 return 0; 289} 290 291/* 292 * ifid - used as EUI64 if not NULL, overrides other EUI64 sources 293 */ 294 295int 296in6_ifattach_linklocal(struct ifnet *ifp, struct in6_addr *ifid) 297{ 298 struct in6_ifaddr *ia6; 299 struct in6_aliasreq ifra; 300 struct nd_prefix pr0; 301 int i, s, error; 302 303 /* 304 * configure link-local address. 305 */ 306 bzero(&ifra, sizeof(ifra)); 307 308 /* 309 * in6_update_ifa() does not use ifra_name, but we accurately set it 310 * for safety. 311 */ 312 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 313 314 ifra.ifra_addr.sin6_family = AF_INET6; 315 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 316 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 317 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 318 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 319 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 320 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 321 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 322 } else if (ifid) { 323 ifra.ifra_addr.sin6_addr = *ifid; 324 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 325 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 326 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 327 ifra.ifra_addr.sin6_addr.s6_addr[8] &= ~EUI64_GBIT; 328 ifra.ifra_addr.sin6_addr.s6_addr[8] |= EUI64_UBIT; 329 } else { 330 if (get_ifid(ifp, &ifra.ifra_addr.sin6_addr) != 0) { 331 nd6log((LOG_ERR, 332 "%s: no ifid available\n", ifp->if_xname)); 333 return (-1); 334 } 335 } 336 337 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 338 ifra.ifra_prefixmask.sin6_family = AF_INET6; 339 ifra.ifra_prefixmask.sin6_addr = in6mask64; 340 /* link-local addresses should NEVER expire. */ 341 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 342 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 343 344 /* 345 * Do not let in6_update_ifa() do DAD, since we need a random delay 346 * before sending an NS at the first time the interface becomes up. 347 * Instead, in6_if_up() will start DAD with a proper random delay. 348 */ 349 ifra.ifra_flags |= IN6_IFF_NODAD; 350 351 /* 352 * Now call in6_update_ifa() to do a bunch of procedures to configure 353 * a link-local address. In the case of CARP, we may be called after 354 * one has already been configured, so check if it's already there 355 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 356 */ 357 s = splsoftnet(); 358 error = in6_update_ifa(ifp, &ifra, in6ifa_ifpforlinklocal(ifp, 0)); 359 splx(s); 360 361 if (error != 0) { 362 /* 363 * XXX: When the interface does not support IPv6, this call 364 * would fail in the SIOCSIFADDR ioctl. I believe the 365 * notification is rather confusing in this case, so just 366 * suppress it. (jinmei@kame.net 20010130) 367 */ 368 if (error != EAFNOSUPPORT) 369 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 370 "configure a link-local address on %s " 371 "(errno=%d)\n", 372 ifp->if_xname, error)); 373 return (-1); 374 } 375 376 /* 377 * Adjust ia6_flags so that in6_if_up will perform DAD. 378 * XXX: Some P2P interfaces seem not to send packets just after 379 * becoming up, so we skip p2p interfaces for safety. 380 */ 381 ia6 = in6ifa_ifpforlinklocal(ifp, 0); /* ia6 must not be NULL */ 382#ifdef DIAGNOSTIC 383 if (!ia6) { 384 panic("ia6 == NULL in in6_ifattach_linklocal"); 385 /* NOTREACHED */ 386 } 387#endif 388 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 389 (ifp->if_type == IFT_CARP)) == 0) { 390 ia6->ia6_flags &= ~IN6_IFF_NODAD; 391 ia6->ia6_flags |= IN6_IFF_TENTATIVE; 392 } 393 394 /* 395 * Make the link-local prefix (fe80::/64%link) as on-link. 396 * Since we'd like to manage prefixes separately from addresses, 397 * we make an ND6 prefix structure for the link-local prefix, 398 * and add it to the prefix list as a never-expire prefix. 399 * XXX: this change might affect some existing code base... 400 */ 401 bzero(&pr0, sizeof(pr0)); 402 pr0.ndpr_ifp = ifp; 403 /* this should be 64 at this moment. */ 404 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 405 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 406 pr0.ndpr_prefix = ifra.ifra_addr; 407 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 408 for (i = 0; i < 4; i++) { 409 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 410 in6mask64.s6_addr32[i]; 411 } 412 /* 413 * Initialize parameters. The link-local prefix must always be 414 * on-link, and its lifetimes never expire. 415 */ 416 pr0.ndpr_raf_onlink = 1; 417 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 418 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 419 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 420 /* 421 * Since there is no other link-local addresses, nd6_prefix_lookup() 422 * probably returns NULL. However, we cannot always expect the result. 423 * For example, if we first remove the (only) existing link-local 424 * address, and then reconfigure another one, the prefix is still 425 * valid with referring to the old link-local address. 426 */ 427 if (nd6_prefix_lookup(&pr0) == NULL) { 428 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 429 return (error); 430 } 431 432 return 0; 433} 434 435/* 436 * ifp - must be IFT_LOOP 437 */ 438 439int 440in6_ifattach_loopback(struct ifnet *ifp) 441{ 442 struct in6_aliasreq ifra; 443 int error; 444 445 bzero(&ifra, sizeof(ifra)); 446 447 /* 448 * in6_update_ifa() does not use ifra_name, but we accurately set it 449 * for safety. 450 */ 451 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 452 453 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 454 ifra.ifra_prefixmask.sin6_family = AF_INET6; 455 ifra.ifra_prefixmask.sin6_addr = in6mask128; 456 457 /* 458 * Always initialize ia_dstaddr (= broadcast address) to loopback 459 * address. Follows IPv4 practice - see in_ifinit(). 460 */ 461 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 462 ifra.ifra_dstaddr.sin6_family = AF_INET6; 463 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 464 465 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 466 ifra.ifra_addr.sin6_family = AF_INET6; 467 ifra.ifra_addr.sin6_addr = in6addr_loopback; 468 469 /* the loopback address should NEVER expire. */ 470 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 471 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 472 473 /* we don't need to perform DAD on loopback interfaces. */ 474 ifra.ifra_flags |= IN6_IFF_NODAD; 475 476 /* 477 * We are sure that this is a newly assigned address, so we can set 478 * NULL to the 3rd arg. 479 */ 480 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 481 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 482 "the loopback address on %s (errno=%d)\n", 483 ifp->if_xname, error)); 484 return (-1); 485 } 486 487 return 0; 488} 489 490/* 491 * compute NI group address, based on the current hostname setting. 492 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 493 * 494 * when ifp == NULL, the caller is responsible for filling scopeid. 495 */ 496int 497in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 498 struct sockaddr_in6 *sa6) 499{ 500 const char *p; 501 u_int8_t *q; 502 SHA2_CTX ctx; 503 u_int8_t digest[SHA512_DIGEST_LENGTH]; 504 u_int8_t l; 505 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 506 507 if (!namelen || !name) 508 return -1; 509 510 p = name; 511 while (p && *p && *p != '.' && p - name < namelen) 512 p++; 513 if (p - name > sizeof(n) - 1) 514 return -1; /* label too long */ 515 l = p - name; 516 strncpy((char *)n, name, l); 517 n[(int)l] = '\0'; 518 for (q = n; *q; q++) { 519 if ('A' <= *q && *q <= 'Z') 520 *q = *q - 'A' + 'a'; 521 } 522 523 /* generate 8 bytes of pseudo-random value. */ 524 SHA512Init(&ctx); 525 SHA512Update(&ctx, &l, sizeof(l)); 526 SHA512Update(&ctx, n, l); 527 SHA512Final(digest, &ctx); 528 529 bzero(sa6, sizeof(*sa6)); 530 sa6->sin6_family = AF_INET6; 531 sa6->sin6_len = sizeof(*sa6); 532 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 533 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 534 sa6->sin6_addr.s6_addr8[11] = 2; 535 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 536 sizeof(sa6->sin6_addr.s6_addr32[3])); 537 538 return 0; 539} 540 541/* 542 * XXX multiple loopback interface needs more care. for instance, 543 * nodelocal address needs to be configured onto only one of them. 544 * XXX multiple link-local address case 545 */ 546void 547in6_ifattach(struct ifnet *ifp) 548{ 549 struct in6_ifaddr *ia6; 550 struct in6_addr in6; 551 552 /* some of the interfaces are inherently not IPv6 capable */ 553 switch (ifp->if_type) { 554 case IFT_BRIDGE: 555 case IFT_ENC: 556 case IFT_PFLOG: 557 case IFT_PFSYNC: 558 return; 559 } 560 561 /* 562 * if link mtu is too small, don't try to configure IPv6. 563 * remember there could be some link-layer that has special 564 * fragmentation logic. 565 */ 566 if (ifp->if_mtu < IPV6_MMTU) { 567 nd6log((LOG_INFO, "in6_ifattach: " 568 "%s has too small MTU, IPv6 not enabled\n", 569 ifp->if_xname)); 570 return; 571 } 572 573 /* 574 * usually, we require multicast capability to the interface 575 */ 576 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 577 nd6log((LOG_INFO, "in6_ifattach: " 578 "%s is not multicast capable, IPv6 not enabled\n", 579 ifp->if_xname)); 580 return; 581 } 582 583 /* 584 * assign loopback address for loopback interface. 585 * XXX multiple loopback interface case. 586 */ 587 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 588 in6 = in6addr_loopback; 589 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 590 if (in6_ifattach_loopback(ifp) != 0) 591 return; 592 } 593 } 594 595 /* 596 * assign a link-local address, if there's none. 597 */ 598 if (ip6_auto_linklocal) { 599 ia6 = in6ifa_ifpforlinklocal(ifp, 0); 600 if (ia6 == NULL) { 601 if (in6_ifattach_linklocal(ifp, NULL) == 0) { 602 /* linklocal address assigned */ 603 } else { 604 /* failed to assign linklocal address. bark? */ 605 } 606 } 607 } 608} 609 610/* 611 * NOTE: in6_ifdetach() does not support loopback if at this moment. 612 */ 613void 614in6_ifdetach(struct ifnet *ifp) 615{ 616 struct ifaddr *ifa, *next; 617 struct rtentry *rt; 618 struct sockaddr_in6 sin6; 619 620#ifdef MROUTING 621 /* remove ip6_mrouter stuff */ 622 ip6_mrouter_detach(ifp); 623#endif 624 625 /* remove neighbor management table */ 626 nd6_purge(ifp); 627 628 /* nuke any of IPv6 addresses we have */ 629 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, next) { 630 if (ifa->ifa_addr->sa_family != AF_INET6) 631 continue; 632 in6_purgeaddr(ifa); 633 dohooks(ifp->if_addrhooks, 0); 634 } 635 636 /* 637 * remove neighbor management table. we call it twice just to make 638 * sure we nuke everything. maybe we need just one call. 639 * XXX: since the first call did not release addresses, some prefixes 640 * might remain. We should call nd6_purge() again to release the 641 * prefixes after removing all addresses above. 642 * (Or can we just delay calling nd6_purge until at this point?) 643 */ 644 nd6_purge(ifp); 645 646 /* remove route to interface local allnodes multicast (ff01::1) */ 647 bzero(&sin6, sizeof(sin6)); 648 sin6.sin6_len = sizeof(struct sockaddr_in6); 649 sin6.sin6_family = AF_INET6; 650 sin6.sin6_addr = in6addr_intfacelocal_allnodes; 651 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 652 rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain); 653 if (rt && rt->rt_ifp == ifp) { 654 struct rt_addrinfo info; 655 656 bzero(&info, sizeof(info)); 657 info.rti_flags = rt->rt_flags; 658 info.rti_info[RTAX_DST] = rt_key(rt); 659 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 660 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 661 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 662 ifp->if_rdomain); 663 rtfree(rt); 664 } 665 666 /* remove route to link-local allnodes multicast (ff02::1) */ 667 bzero(&sin6, sizeof(sin6)); 668 sin6.sin6_len = sizeof(struct sockaddr_in6); 669 sin6.sin6_family = AF_INET6; 670 sin6.sin6_addr = in6addr_linklocal_allnodes; 671 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 672 rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain); 673 if (rt && rt->rt_ifp == ifp) { 674 struct rt_addrinfo info; 675 676 bzero(&info, sizeof(info)); 677 info.rti_flags = rt->rt_flags; 678 info.rti_info[RTAX_DST] = rt_key(rt); 679 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 680 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 681 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 682 ifp->if_rdomain); 683 rtfree(rt); 684 } 685 686 if (ifp->if_xflags & IFXF_AUTOCONF6) { 687 nd6_rs_timeout_count--; 688 if (nd6_rs_timeout_count == 0) 689 timeout_del(&nd6_rs_output_timer); 690 if (RS_LHCOOKIE(ifp) != NULL) 691 hook_disestablish(ifp->if_linkstatehooks, 692 RS_LHCOOKIE(ifp)); 693 } 694} 695