in6_ifattach.c revision 1.76
1/* $OpenBSD: in6_ifattach.c,v 1.76 2014/11/18 23:55:01 krw 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/md5.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 60unsigned long in6_maxmtu = 0; 61 62int ip6_auto_linklocal = 1; /* enable by default */ 63 64int get_last_resort_ifid(struct ifnet *, struct in6_addr *); 65int get_hw_ifid(struct ifnet *, struct in6_addr *); 66int get_ifid(struct ifnet *, struct in6_addr *); 67int in6_ifattach_loopback(struct ifnet *); 68 69#define EUI64_GBIT 0x01 70#define EUI64_UBIT 0x02 71#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 72#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 73#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 74#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 75#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 76 77#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 78#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 79 80/* 81 * Generate a last-resort interface identifier, when the machine has no 82 * IEEE802/EUI64 address sources. 83 * The goal here is to get an interface identifier that is 84 * (1) random enough and (2) does not change across reboot. 85 * We currently use MD5(hostname) for it. 86 * 87 * in6 - upper 64bits are preserved 88 */ 89int 90get_last_resort_ifid(struct ifnet *ifp, struct in6_addr *in6) 91{ 92 MD5_CTX ctxt; 93 u_int8_t digest[16]; 94 95#if 0 96 /* we need at least several letters as seed for ifid */ 97 if (hostnamelen < 3) 98 return -1; 99#endif 100 101 /* generate 8 bytes of pseudo-random value. */ 102 bzero(&ctxt, sizeof(ctxt)); 103 MD5Init(&ctxt); 104 MD5Update(&ctxt, hostname, hostnamelen); 105 MD5Final(digest, &ctxt); 106 107 /* assumes sizeof(digest) > sizeof(ifid) */ 108 bcopy(digest, &in6->s6_addr[8], 8); 109 110 /* make sure to set "u" bit to local, and "g" bit to individual. */ 111 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 112 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 113 114 /* convert EUI64 into IPv6 interface identifier */ 115 EUI64_TO_IFID(in6); 116 117 return 0; 118} 119 120/* 121 * Generate a random interface identifier. 122 * 123 * in6 - upper 64bits are preserved 124 */ 125void 126in6_get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 127{ 128 arc4random_buf(&in6->s6_addr32[2], 8); 129 130 /* make sure to set "u" bit to local, and "g" bit to individual. */ 131 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 132 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 133 134 /* convert EUI64 into IPv6 interface identifier */ 135 EUI64_TO_IFID(in6); 136} 137 138/* 139 * Get interface identifier for the specified interface. 140 * 141 * in6 - upper 64bits are preserved 142 */ 143int 144get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 145{ 146 struct sockaddr_dl *sdl; 147 char *addr; 148 size_t addrlen; 149 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 150 static u_int8_t allone[8] = 151 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 152 153 sdl = (struct sockaddr_dl *)ifp->if_sadl; 154 if (sdl == NULL || sdl->sdl_alen == 0) 155 return -1; 156 157 addr = LLADDR(sdl); 158 addrlen = sdl->sdl_alen; 159 160 switch (ifp->if_type) { 161 case IFT_IEEE1394: 162 case IFT_IEEE80211: 163 /* IEEE1394 uses 16byte length address starting with EUI64 */ 164 if (addrlen > 8) 165 addrlen = 8; 166 break; 167 default: 168 break; 169 } 170 171 /* get EUI64 */ 172 switch (ifp->if_type) { 173 /* IEEE802/EUI64 cases - what others? */ 174 case IFT_ETHER: 175 case IFT_CARP: 176 case IFT_IEEE1394: 177 case IFT_IEEE80211: 178 /* look at IEEE802/EUI64 only */ 179 if (addrlen != 8 && addrlen != 6) 180 return -1; 181 182 /* 183 * check for invalid MAC address - on bsdi, we see it a lot 184 * since wildboar configures all-zero MAC on pccard before 185 * card insertion. 186 */ 187 if (bcmp(addr, allzero, addrlen) == 0) 188 return -1; 189 if (bcmp(addr, allone, addrlen) == 0) 190 return -1; 191 192 /* make EUI64 address */ 193 if (addrlen == 8) 194 bcopy(addr, &in6->s6_addr[8], 8); 195 else if (addrlen == 6) { 196 in6->s6_addr[8] = addr[0]; 197 in6->s6_addr[9] = addr[1]; 198 in6->s6_addr[10] = addr[2]; 199 in6->s6_addr[11] = 0xff; 200 in6->s6_addr[12] = 0xfe; 201 in6->s6_addr[13] = addr[3]; 202 in6->s6_addr[14] = addr[4]; 203 in6->s6_addr[15] = addr[5]; 204 } 205 break; 206 207 case IFT_GIF: 208 /* 209 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 210 * however, IPv4 address is not very suitable as unique 211 * identifier source (can be renumbered). 212 * we don't do this. 213 */ 214 return -1; 215 216 default: 217 return -1; 218 } 219 220 /* sanity check: g bit must not indicate "group" */ 221 if (EUI64_GROUP(in6)) 222 return -1; 223 224 /* convert EUI64 into IPv6 interface identifier */ 225 EUI64_TO_IFID(in6); 226 227 /* 228 * sanity check: ifid must not be all zero, avoid conflict with 229 * subnet router anycast 230 */ 231 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 232 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 233 return -1; 234 } 235 236 return 0; 237} 238 239/* 240 * Get interface identifier for the specified interface. If it is not 241 * available on ifp0, borrow interface identifier from other information 242 * sources. 243 */ 244int 245get_ifid(struct ifnet *ifp0, struct in6_addr *in6) 246{ 247 struct ifnet *ifp; 248 249 /* first, try to get it from the interface itself */ 250 if (get_hw_ifid(ifp0, in6) == 0) { 251 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 252 ifp0->if_xname)); 253 goto success; 254 } 255 256 /* next, try to get it from some other hardware interface */ 257 TAILQ_FOREACH(ifp, &ifnet, if_list) { 258 if (ifp == ifp0) 259 continue; 260 if (get_hw_ifid(ifp, in6) != 0) 261 continue; 262 263 /* 264 * to borrow ifid from other interface, ifid needs to be 265 * globally unique 266 */ 267 if (IFID_UNIVERSAL(in6)) { 268 nd6log((LOG_DEBUG, 269 "%s: borrow interface identifier from %s\n", 270 ifp0->if_xname, ifp->if_xname)); 271 goto success; 272 } 273 } 274 275 /* last resort: get from random number source */ 276 if (get_last_resort_ifid(ifp, in6) == 0) { 277 nd6log((LOG_DEBUG, 278 "%s: interface identifier generated by random number\n", 279 ifp0->if_xname)); 280 goto success; 281 } 282 283 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 284 return -1; 285 286success: 287 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 288 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 289 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 290 in6->s6_addr[14], in6->s6_addr[15])); 291 return 0; 292} 293 294/* 295 * ifid - used as EUI64 if not NULL, overrides other EUI64 sources 296 */ 297 298int 299in6_ifattach_linklocal(struct ifnet *ifp, struct in6_addr *ifid) 300{ 301 struct in6_ifaddr *ia6; 302 struct in6_aliasreq ifra; 303 struct nd_prefix pr0; 304 int i, s, error; 305 306 /* 307 * configure link-local address. 308 */ 309 bzero(&ifra, sizeof(ifra)); 310 311 /* 312 * in6_update_ifa() does not use ifra_name, but we accurately set it 313 * for safety. 314 */ 315 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 316 317 ifra.ifra_addr.sin6_family = AF_INET6; 318 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 319 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 320 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 321 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 322 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 323 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 324 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 325 } else if (ifid) { 326 ifra.ifra_addr.sin6_addr = *ifid; 327 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 328 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 329 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 330 ifra.ifra_addr.sin6_addr.s6_addr[8] &= ~EUI64_GBIT; 331 ifra.ifra_addr.sin6_addr.s6_addr[8] |= EUI64_UBIT; 332 } else { 333 if (get_ifid(ifp, &ifra.ifra_addr.sin6_addr) != 0) { 334 nd6log((LOG_ERR, 335 "%s: no ifid available\n", ifp->if_xname)); 336 return (-1); 337 } 338 } 339 340 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 341 ifra.ifra_prefixmask.sin6_family = AF_INET6; 342 ifra.ifra_prefixmask.sin6_addr = in6mask64; 343 /* link-local addresses should NEVER expire. */ 344 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 345 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 346 347 /* 348 * Do not let in6_update_ifa() do DAD, since we need a random delay 349 * before sending an NS at the first time the interface becomes up. 350 * Instead, in6_if_up() will start DAD with a proper random delay. 351 */ 352 ifra.ifra_flags |= IN6_IFF_NODAD; 353 354 /* 355 * Now call in6_update_ifa() to do a bunch of procedures to configure 356 * a link-local address. In the case of CARP, we may be called after 357 * one has already been configured, so check if it's already there 358 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 359 */ 360 s = splsoftnet(); 361 error = in6_update_ifa(ifp, &ifra, in6ifa_ifpforlinklocal(ifp, 0)); 362 splx(s); 363 364 if (error != 0) { 365 /* 366 * XXX: When the interface does not support IPv6, this call 367 * would fail in the SIOCSIFADDR ioctl. I believe the 368 * notification is rather confusing in this case, so just 369 * suppress it. (jinmei@kame.net 20010130) 370 */ 371 if (error != EAFNOSUPPORT) 372 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 373 "configure a link-local address on %s " 374 "(errno=%d)\n", 375 ifp->if_xname, error)); 376 return (-1); 377 } 378 379 /* 380 * Adjust ia6_flags so that in6_if_up will perform DAD. 381 * XXX: Some P2P interfaces seem not to send packets just after 382 * becoming up, so we skip p2p interfaces for safety. 383 */ 384 ia6 = in6ifa_ifpforlinklocal(ifp, 0); /* ia6 must not be NULL */ 385#ifdef DIAGNOSTIC 386 if (!ia6) { 387 panic("ia6 == NULL in in6_ifattach_linklocal"); 388 /* NOTREACHED */ 389 } 390#endif 391 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 392 (ifp->if_type == IFT_CARP)) == 0) { 393 ia6->ia6_flags &= ~IN6_IFF_NODAD; 394 ia6->ia6_flags |= IN6_IFF_TENTATIVE; 395 } 396 397 /* 398 * Make the link-local prefix (fe80::/64%link) as on-link. 399 * Since we'd like to manage prefixes separately from addresses, 400 * we make an ND6 prefix structure for the link-local prefix, 401 * and add it to the prefix list as a never-expire prefix. 402 * XXX: this change might affect some existing code base... 403 */ 404 bzero(&pr0, sizeof(pr0)); 405 pr0.ndpr_ifp = ifp; 406 /* this should be 64 at this moment. */ 407 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 408 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 409 pr0.ndpr_prefix = ifra.ifra_addr; 410 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 411 for (i = 0; i < 4; i++) { 412 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 413 in6mask64.s6_addr32[i]; 414 } 415 /* 416 * Initialize parameters. The link-local prefix must always be 417 * on-link, and its lifetimes never expire. 418 */ 419 pr0.ndpr_raf_onlink = 1; 420 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 421 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 422 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 423 /* 424 * Since there is no other link-local addresses, nd6_prefix_lookup() 425 * probably returns NULL. However, we cannot always expect the result. 426 * For example, if we first remove the (only) existing link-local 427 * address, and then reconfigure another one, the prefix is still 428 * valid with referring to the old link-local address. 429 */ 430 if (nd6_prefix_lookup(&pr0) == NULL) { 431 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 432 return (error); 433 } 434 435 return 0; 436} 437 438/* 439 * ifp - must be IFT_LOOP 440 */ 441 442int 443in6_ifattach_loopback(struct ifnet *ifp) 444{ 445 struct in6_aliasreq ifra; 446 int error; 447 448 bzero(&ifra, sizeof(ifra)); 449 450 /* 451 * in6_update_ifa() does not use ifra_name, but we accurately set it 452 * for safety. 453 */ 454 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 455 456 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 457 ifra.ifra_prefixmask.sin6_family = AF_INET6; 458 ifra.ifra_prefixmask.sin6_addr = in6mask128; 459 460 /* 461 * Always initialize ia_dstaddr (= broadcast address) to loopback 462 * address. Follows IPv4 practice - see in_ifinit(). 463 */ 464 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 465 ifra.ifra_dstaddr.sin6_family = AF_INET6; 466 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 467 468 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 469 ifra.ifra_addr.sin6_family = AF_INET6; 470 ifra.ifra_addr.sin6_addr = in6addr_loopback; 471 472 /* the loopback address should NEVER expire. */ 473 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 474 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 475 476 /* we don't need to perform DAD on loopback interfaces. */ 477 ifra.ifra_flags |= IN6_IFF_NODAD; 478 479 /* 480 * We are sure that this is a newly assigned address, so we can set 481 * NULL to the 3rd arg. 482 */ 483 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 484 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 485 "the loopback address on %s (errno=%d)\n", 486 ifp->if_xname, error)); 487 return (-1); 488 } 489 490 return 0; 491} 492 493/* 494 * compute NI group address, based on the current hostname setting. 495 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 496 * 497 * when ifp == NULL, the caller is responsible for filling scopeid. 498 */ 499int 500in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 501 struct sockaddr_in6 *sa6) 502{ 503 const char *p; 504 u_int8_t *q; 505 MD5_CTX ctxt; 506 u_int8_t digest[16]; 507 u_int8_t l; 508 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 509 510 if (!namelen || !name) 511 return -1; 512 513 p = name; 514 while (p && *p && *p != '.' && p - name < namelen) 515 p++; 516 if (p - name > sizeof(n) - 1) 517 return -1; /* label too long */ 518 l = p - name; 519 strncpy((char *)n, name, l); 520 n[(int)l] = '\0'; 521 for (q = n; *q; q++) { 522 if ('A' <= *q && *q <= 'Z') 523 *q = *q - 'A' + 'a'; 524 } 525 526 /* generate 8 bytes of pseudo-random value. */ 527 bzero(&ctxt, sizeof(ctxt)); 528 MD5Init(&ctxt); 529 MD5Update(&ctxt, &l, sizeof(l)); 530 MD5Update(&ctxt, n, l); 531 MD5Final(digest, &ctxt); 532 533 bzero(sa6, sizeof(*sa6)); 534 sa6->sin6_family = AF_INET6; 535 sa6->sin6_len = sizeof(*sa6); 536 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 537 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 538 sa6->sin6_addr.s6_addr8[11] = 2; 539 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 540 sizeof(sa6->sin6_addr.s6_addr32[3])); 541 542 return 0; 543} 544 545/* 546 * XXX multiple loopback interface needs more care. for instance, 547 * nodelocal address needs to be configured onto only one of them. 548 * XXX multiple link-local address case 549 */ 550void 551in6_ifattach(struct ifnet *ifp) 552{ 553 struct in6_ifaddr *ia6; 554 struct in6_addr in6; 555 556 /* some of the interfaces are inherently not IPv6 capable */ 557 switch (ifp->if_type) { 558 case IFT_BRIDGE: 559 case IFT_ENC: 560 case IFT_PFLOG: 561 case IFT_PFSYNC: 562 return; 563 } 564 565 /* 566 * if link mtu is too small, don't try to configure IPv6. 567 * remember there could be some link-layer that has special 568 * fragmentation logic. 569 */ 570 if (ifp->if_mtu < IPV6_MMTU) { 571 nd6log((LOG_INFO, "in6_ifattach: " 572 "%s has too small MTU, IPv6 not enabled\n", 573 ifp->if_xname)); 574 return; 575 } 576 577 /* 578 * usually, we require multicast capability to the interface 579 */ 580 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 581 nd6log((LOG_INFO, "in6_ifattach: " 582 "%s is not multicast capable, IPv6 not enabled\n", 583 ifp->if_xname)); 584 return; 585 } 586 587 /* 588 * assign loopback address for loopback interface. 589 * XXX multiple loopback interface case. 590 */ 591 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 592 in6 = in6addr_loopback; 593 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 594 if (in6_ifattach_loopback(ifp) != 0) 595 return; 596 } 597 } 598 599 /* 600 * assign a link-local address, if there's none. 601 */ 602 if (ip6_auto_linklocal) { 603 ia6 = in6ifa_ifpforlinklocal(ifp, 0); 604 if (ia6 == NULL) { 605 if (in6_ifattach_linklocal(ifp, NULL) == 0) { 606 /* linklocal address assigned */ 607 } else { 608 /* failed to assign linklocal address. bark? */ 609 } 610 } 611 } 612} 613 614/* 615 * NOTE: in6_ifdetach() does not support loopback if at this moment. 616 */ 617void 618in6_ifdetach(struct ifnet *ifp) 619{ 620 struct ifaddr *ifa, *next; 621 struct rtentry *rt; 622 struct sockaddr_in6 sin6; 623 624#ifdef MROUTING 625 /* remove ip6_mrouter stuff */ 626 ip6_mrouter_detach(ifp); 627#endif 628 629 /* remove neighbor management table */ 630 nd6_purge(ifp); 631 632 /* nuke any of IPv6 addresses we have */ 633 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, next) { 634 if (ifa->ifa_addr->sa_family != AF_INET6) 635 continue; 636 in6_purgeaddr(ifa); 637 dohooks(ifp->if_addrhooks, 0); 638 } 639 640 /* 641 * remove neighbor management table. we call it twice just to make 642 * sure we nuke everything. maybe we need just one call. 643 * XXX: since the first call did not release addresses, some prefixes 644 * might remain. We should call nd6_purge() again to release the 645 * prefixes after removing all addresses above. 646 * (Or can we just delay calling nd6_purge until at this point?) 647 */ 648 nd6_purge(ifp); 649 650 /* remove route to interface local allnodes multicast (ff01::1) */ 651 bzero(&sin6, sizeof(sin6)); 652 sin6.sin6_len = sizeof(struct sockaddr_in6); 653 sin6.sin6_family = AF_INET6; 654 sin6.sin6_addr = in6addr_intfacelocal_allnodes; 655 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 656 rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain); 657 if (rt && rt->rt_ifp == ifp) { 658 struct rt_addrinfo info; 659 660 bzero(&info, sizeof(info)); 661 info.rti_flags = rt->rt_flags; 662 info.rti_info[RTAX_DST] = rt_key(rt); 663 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 664 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 665 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 666 ifp->if_rdomain); 667 rtfree(rt); 668 } 669 670 /* remove route to link-local allnodes multicast (ff02::1) */ 671 bzero(&sin6, sizeof(sin6)); 672 sin6.sin6_len = sizeof(struct sockaddr_in6); 673 sin6.sin6_family = AF_INET6; 674 sin6.sin6_addr = in6addr_linklocal_allnodes; 675 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 676 rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain); 677 if (rt && rt->rt_ifp == ifp) { 678 struct rt_addrinfo info; 679 680 bzero(&info, sizeof(info)); 681 info.rti_flags = rt->rt_flags; 682 info.rti_info[RTAX_DST] = rt_key(rt); 683 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 684 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 685 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 686 ifp->if_rdomain); 687 rtfree(rt); 688 } 689 690 if (ifp->if_xflags & IFXF_AUTOCONF6) { 691 nd6_rs_timeout_count--; 692 if (nd6_rs_timeout_count == 0) 693 timeout_del(&nd6_rs_output_timer); 694 if (RS_LHCOOKIE(ifp) != NULL) 695 hook_disestablish(ifp->if_linkstatehooks, 696 RS_LHCOOKIE(ifp)); 697 } 698} 699