in6_ifattach.c revision 1.75
1/* $OpenBSD: in6_ifattach.c,v 1.75 2014/11/18 02:37:31 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/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/ip6_var.h> 56#include <netinet6/nd6.h> 57#ifdef MROUTING 58#include <netinet6/ip6_mroute.h> 59#endif 60 61unsigned long in6_maxmtu = 0; 62 63int ip6_auto_linklocal = 1; /* enable by default */ 64 65int get_last_resort_ifid(struct ifnet *, struct in6_addr *); 66int get_hw_ifid(struct ifnet *, struct in6_addr *); 67int get_ifid(struct ifnet *, struct in6_addr *); 68int in6_ifattach_loopback(struct ifnet *); 69 70#define EUI64_GBIT 0x01 71#define EUI64_UBIT 0x02 72#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 73#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 74#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 75#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 76#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 77 78#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 79#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 80 81/* 82 * Generate a last-resort interface identifier, when the machine has no 83 * IEEE802/EUI64 address sources. 84 * The goal here is to get an interface identifier that is 85 * (1) random enough and (2) does not change across reboot. 86 * We currently use MD5(hostname) for it. 87 * 88 * in6 - upper 64bits are preserved 89 */ 90int 91get_last_resort_ifid(struct ifnet *ifp, struct in6_addr *in6) 92{ 93 MD5_CTX ctxt; 94 u_int8_t digest[16]; 95 96#if 0 97 /* we need at least several letters as seed for ifid */ 98 if (hostnamelen < 3) 99 return -1; 100#endif 101 102 /* generate 8 bytes of pseudo-random value. */ 103 bzero(&ctxt, sizeof(ctxt)); 104 MD5Init(&ctxt); 105 MD5Update(&ctxt, hostname, hostnamelen); 106 MD5Final(digest, &ctxt); 107 108 /* assumes sizeof(digest) > sizeof(ifid) */ 109 bcopy(digest, &in6->s6_addr[8], 8); 110 111 /* make sure to set "u" bit to local, and "g" bit to individual. */ 112 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 113 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 114 115 /* convert EUI64 into IPv6 interface identifier */ 116 EUI64_TO_IFID(in6); 117 118 return 0; 119} 120 121/* 122 * Generate a random interface identifier. 123 * 124 * in6 - upper 64bits are preserved 125 */ 126void 127in6_get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 128{ 129 arc4random_buf(&in6->s6_addr32[2], 8); 130 131 /* make sure to set "u" bit to local, and "g" bit to individual. */ 132 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 133 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 134 135 /* convert EUI64 into IPv6 interface identifier */ 136 EUI64_TO_IFID(in6); 137} 138 139/* 140 * Get interface identifier for the specified interface. 141 * 142 * in6 - upper 64bits are preserved 143 */ 144int 145get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 146{ 147 struct sockaddr_dl *sdl; 148 char *addr; 149 size_t addrlen; 150 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 151 static u_int8_t allone[8] = 152 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 153 154 sdl = (struct sockaddr_dl *)ifp->if_sadl; 155 if (sdl == NULL || sdl->sdl_alen == 0) 156 return -1; 157 158 addr = LLADDR(sdl); 159 addrlen = sdl->sdl_alen; 160 161 switch (ifp->if_type) { 162 case IFT_IEEE1394: 163 case IFT_IEEE80211: 164 /* IEEE1394 uses 16byte length address starting with EUI64 */ 165 if (addrlen > 8) 166 addrlen = 8; 167 break; 168 default: 169 break; 170 } 171 172 /* get EUI64 */ 173 switch (ifp->if_type) { 174 /* IEEE802/EUI64 cases - what others? */ 175 case IFT_ETHER: 176 case IFT_CARP: 177 case IFT_IEEE1394: 178 case IFT_IEEE80211: 179 /* look at IEEE802/EUI64 only */ 180 if (addrlen != 8 && addrlen != 6) 181 return -1; 182 183 /* 184 * check for invalid MAC address - on bsdi, we see it a lot 185 * since wildboar configures all-zero MAC on pccard before 186 * card insertion. 187 */ 188 if (bcmp(addr, allzero, addrlen) == 0) 189 return -1; 190 if (bcmp(addr, allone, addrlen) == 0) 191 return -1; 192 193 /* make EUI64 address */ 194 if (addrlen == 8) 195 bcopy(addr, &in6->s6_addr[8], 8); 196 else if (addrlen == 6) { 197 in6->s6_addr[8] = addr[0]; 198 in6->s6_addr[9] = addr[1]; 199 in6->s6_addr[10] = addr[2]; 200 in6->s6_addr[11] = 0xff; 201 in6->s6_addr[12] = 0xfe; 202 in6->s6_addr[13] = addr[3]; 203 in6->s6_addr[14] = addr[4]; 204 in6->s6_addr[15] = addr[5]; 205 } 206 break; 207 208 case IFT_GIF: 209 /* 210 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 211 * however, IPv4 address is not very suitable as unique 212 * identifier source (can be renumbered). 213 * we don't do this. 214 */ 215 return -1; 216 217 default: 218 return -1; 219 } 220 221 /* sanity check: g bit must not indicate "group" */ 222 if (EUI64_GROUP(in6)) 223 return -1; 224 225 /* convert EUI64 into IPv6 interface identifier */ 226 EUI64_TO_IFID(in6); 227 228 /* 229 * sanity check: ifid must not be all zero, avoid conflict with 230 * subnet router anycast 231 */ 232 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 233 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 234 return -1; 235 } 236 237 return 0; 238} 239 240/* 241 * Get interface identifier for the specified interface. If it is not 242 * available on ifp0, borrow interface identifier from other information 243 * sources. 244 */ 245int 246get_ifid(struct ifnet *ifp0, struct in6_addr *in6) 247{ 248 struct ifnet *ifp; 249 250 /* first, try to get it from the interface itself */ 251 if (get_hw_ifid(ifp0, in6) == 0) { 252 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 253 ifp0->if_xname)); 254 goto success; 255 } 256 257 /* next, try to get it from some other hardware interface */ 258 TAILQ_FOREACH(ifp, &ifnet, if_list) { 259 if (ifp == ifp0) 260 continue; 261 if (get_hw_ifid(ifp, in6) != 0) 262 continue; 263 264 /* 265 * to borrow ifid from other interface, ifid needs to be 266 * globally unique 267 */ 268 if (IFID_UNIVERSAL(in6)) { 269 nd6log((LOG_DEBUG, 270 "%s: borrow interface identifier from %s\n", 271 ifp0->if_xname, ifp->if_xname)); 272 goto success; 273 } 274 } 275 276 /* last resort: get from random number source */ 277 if (get_last_resort_ifid(ifp, in6) == 0) { 278 nd6log((LOG_DEBUG, 279 "%s: interface identifier generated by random number\n", 280 ifp0->if_xname)); 281 goto success; 282 } 283 284 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 285 return -1; 286 287success: 288 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 289 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 290 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 291 in6->s6_addr[14], in6->s6_addr[15])); 292 return 0; 293} 294 295/* 296 * ifid - used as EUI64 if not NULL, overrides other EUI64 sources 297 */ 298 299int 300in6_ifattach_linklocal(struct ifnet *ifp, struct in6_addr *ifid) 301{ 302 struct in6_ifaddr *ia6; 303 struct in6_aliasreq ifra; 304 struct nd_prefix pr0; 305 int i, s, error; 306 307 /* 308 * configure link-local address. 309 */ 310 bzero(&ifra, sizeof(ifra)); 311 312 /* 313 * in6_update_ifa() does not use ifra_name, but we accurately set it 314 * for safety. 315 */ 316 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 317 318 ifra.ifra_addr.sin6_family = AF_INET6; 319 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 320 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 321 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 322 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 323 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 324 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 325 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 326 } else if (ifid) { 327 ifra.ifra_addr.sin6_addr = *ifid; 328 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 329 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 330 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 331 ifra.ifra_addr.sin6_addr.s6_addr[8] &= ~EUI64_GBIT; 332 ifra.ifra_addr.sin6_addr.s6_addr[8] |= EUI64_UBIT; 333 } else { 334 if (get_ifid(ifp, &ifra.ifra_addr.sin6_addr) != 0) { 335 nd6log((LOG_ERR, 336 "%s: no ifid available\n", ifp->if_xname)); 337 return (-1); 338 } 339 } 340 341 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 342 ifra.ifra_prefixmask.sin6_family = AF_INET6; 343 ifra.ifra_prefixmask.sin6_addr = in6mask64; 344 /* link-local addresses should NEVER expire. */ 345 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 346 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 347 348 /* 349 * Do not let in6_update_ifa() do DAD, since we need a random delay 350 * before sending an NS at the first time the interface becomes up. 351 * Instead, in6_if_up() will start DAD with a proper random delay. 352 */ 353 ifra.ifra_flags |= IN6_IFF_NODAD; 354 355 /* 356 * Now call in6_update_ifa() to do a bunch of procedures to configure 357 * a link-local address. In the case of CARP, we may be called after 358 * one has already been configured, so check if it's already there 359 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 360 */ 361 s = splsoftnet(); 362 error = in6_update_ifa(ifp, &ifra, in6ifa_ifpforlinklocal(ifp, 0)); 363 splx(s); 364 365 if (error != 0) { 366 /* 367 * XXX: When the interface does not support IPv6, this call 368 * would fail in the SIOCSIFADDR ioctl. I believe the 369 * notification is rather confusing in this case, so just 370 * suppress it. (jinmei@kame.net 20010130) 371 */ 372 if (error != EAFNOSUPPORT) 373 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 374 "configure a link-local address on %s " 375 "(errno=%d)\n", 376 ifp->if_xname, error)); 377 return (-1); 378 } 379 380 /* 381 * Adjust ia6_flags so that in6_if_up will perform DAD. 382 * XXX: Some P2P interfaces seem not to send packets just after 383 * becoming up, so we skip p2p interfaces for safety. 384 */ 385 ia6 = in6ifa_ifpforlinklocal(ifp, 0); /* ia6 must not be NULL */ 386#ifdef DIAGNOSTIC 387 if (!ia6) { 388 panic("ia6 == NULL in in6_ifattach_linklocal"); 389 /* NOTREACHED */ 390 } 391#endif 392 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 393 (ifp->if_type == IFT_CARP)) == 0) { 394 ia6->ia6_flags &= ~IN6_IFF_NODAD; 395 ia6->ia6_flags |= IN6_IFF_TENTATIVE; 396 } 397 398 /* 399 * Make the link-local prefix (fe80::/64%link) as on-link. 400 * Since we'd like to manage prefixes separately from addresses, 401 * we make an ND6 prefix structure for the link-local prefix, 402 * and add it to the prefix list as a never-expire prefix. 403 * XXX: this change might affect some existing code base... 404 */ 405 bzero(&pr0, sizeof(pr0)); 406 pr0.ndpr_ifp = ifp; 407 /* this should be 64 at this moment. */ 408 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 409 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 410 pr0.ndpr_prefix = ifra.ifra_addr; 411 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 412 for (i = 0; i < 4; i++) { 413 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 414 in6mask64.s6_addr32[i]; 415 } 416 /* 417 * Initialize parameters. The link-local prefix must always be 418 * on-link, and its lifetimes never expire. 419 */ 420 pr0.ndpr_raf_onlink = 1; 421 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 422 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 423 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 424 /* 425 * Since there is no other link-local addresses, nd6_prefix_lookup() 426 * probably returns NULL. However, we cannot always expect the result. 427 * For example, if we first remove the (only) existing link-local 428 * address, and then reconfigure another one, the prefix is still 429 * valid with referring to the old link-local address. 430 */ 431 if (nd6_prefix_lookup(&pr0) == NULL) { 432 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 433 return (error); 434 } 435 436 return 0; 437} 438 439/* 440 * ifp - must be IFT_LOOP 441 */ 442 443int 444in6_ifattach_loopback(struct ifnet *ifp) 445{ 446 struct in6_aliasreq ifra; 447 int error; 448 449 bzero(&ifra, sizeof(ifra)); 450 451 /* 452 * in6_update_ifa() does not use ifra_name, but we accurately set it 453 * for safety. 454 */ 455 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 456 457 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 458 ifra.ifra_prefixmask.sin6_family = AF_INET6; 459 ifra.ifra_prefixmask.sin6_addr = in6mask128; 460 461 /* 462 * Always initialize ia_dstaddr (= broadcast address) to loopback 463 * address. Follows IPv4 practice - see in_ifinit(). 464 */ 465 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 466 ifra.ifra_dstaddr.sin6_family = AF_INET6; 467 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 468 469 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 470 ifra.ifra_addr.sin6_family = AF_INET6; 471 ifra.ifra_addr.sin6_addr = in6addr_loopback; 472 473 /* the loopback address should NEVER expire. */ 474 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 475 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 476 477 /* we don't need to perform DAD on loopback interfaces. */ 478 ifra.ifra_flags |= IN6_IFF_NODAD; 479 480 /* 481 * We are sure that this is a newly assigned address, so we can set 482 * NULL to the 3rd arg. 483 */ 484 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 485 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 486 "the loopback address on %s (errno=%d)\n", 487 ifp->if_xname, error)); 488 return (-1); 489 } 490 491 return 0; 492} 493 494/* 495 * compute NI group address, based on the current hostname setting. 496 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 497 * 498 * when ifp == NULL, the caller is responsible for filling scopeid. 499 */ 500int 501in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 502 struct sockaddr_in6 *sa6) 503{ 504 const char *p; 505 u_int8_t *q; 506 MD5_CTX ctxt; 507 u_int8_t digest[16]; 508 u_int8_t l; 509 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 510 511 if (!namelen || !name) 512 return -1; 513 514 p = name; 515 while (p && *p && *p != '.' && p - name < namelen) 516 p++; 517 if (p - name > sizeof(n) - 1) 518 return -1; /* label too long */ 519 l = p - name; 520 strncpy((char *)n, name, l); 521 n[(int)l] = '\0'; 522 for (q = n; *q; q++) { 523 if ('A' <= *q && *q <= 'Z') 524 *q = *q - 'A' + 'a'; 525 } 526 527 /* generate 8 bytes of pseudo-random value. */ 528 bzero(&ctxt, sizeof(ctxt)); 529 MD5Init(&ctxt); 530 MD5Update(&ctxt, &l, sizeof(l)); 531 MD5Update(&ctxt, n, l); 532 MD5Final(digest, &ctxt); 533 534 bzero(sa6, sizeof(*sa6)); 535 sa6->sin6_family = AF_INET6; 536 sa6->sin6_len = sizeof(*sa6); 537 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 538 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 539 sa6->sin6_addr.s6_addr8[11] = 2; 540 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 541 sizeof(sa6->sin6_addr.s6_addr32[3])); 542 543 return 0; 544} 545 546/* 547 * XXX multiple loopback interface needs more care. for instance, 548 * nodelocal address needs to be configured onto only one of them. 549 * XXX multiple link-local address case 550 */ 551void 552in6_ifattach(struct ifnet *ifp) 553{ 554 struct in6_ifaddr *ia6; 555 struct in6_addr in6; 556 557 /* some of the interfaces are inherently not IPv6 capable */ 558 switch (ifp->if_type) { 559 case IFT_BRIDGE: 560 case IFT_ENC: 561 case IFT_PFLOG: 562 case IFT_PFSYNC: 563 return; 564 } 565 566 /* 567 * if link mtu is too small, don't try to configure IPv6. 568 * remember there could be some link-layer that has special 569 * fragmentation logic. 570 */ 571 if (ifp->if_mtu < IPV6_MMTU) { 572 nd6log((LOG_INFO, "in6_ifattach: " 573 "%s has too small MTU, IPv6 not enabled\n", 574 ifp->if_xname)); 575 return; 576 } 577 578 /* 579 * usually, we require multicast capability to the interface 580 */ 581 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 582 nd6log((LOG_INFO, "in6_ifattach: " 583 "%s is not multicast capable, IPv6 not enabled\n", 584 ifp->if_xname)); 585 return; 586 } 587 588 /* 589 * assign loopback address for loopback interface. 590 * XXX multiple loopback interface case. 591 */ 592 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 593 in6 = in6addr_loopback; 594 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 595 if (in6_ifattach_loopback(ifp) != 0) 596 return; 597 } 598 } 599 600 /* 601 * assign a link-local address, if there's none. 602 */ 603 if (ip6_auto_linklocal) { 604 ia6 = in6ifa_ifpforlinklocal(ifp, 0); 605 if (ia6 == NULL) { 606 if (in6_ifattach_linklocal(ifp, NULL) == 0) { 607 /* linklocal address assigned */ 608 } else { 609 /* failed to assign linklocal address. bark? */ 610 } 611 } 612 } 613} 614 615/* 616 * NOTE: in6_ifdetach() does not support loopback if at this moment. 617 */ 618void 619in6_ifdetach(struct ifnet *ifp) 620{ 621 struct ifaddr *ifa, *next; 622 struct rtentry *rt; 623 struct sockaddr_in6 sin6; 624 625#ifdef MROUTING 626 /* remove ip6_mrouter stuff */ 627 ip6_mrouter_detach(ifp); 628#endif 629 630 /* remove neighbor management table */ 631 nd6_purge(ifp); 632 633 /* nuke any of IPv6 addresses we have */ 634 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, next) { 635 if (ifa->ifa_addr->sa_family != AF_INET6) 636 continue; 637 in6_purgeaddr(ifa); 638 dohooks(ifp->if_addrhooks, 0); 639 } 640 641 /* 642 * remove neighbor management table. we call it twice just to make 643 * sure we nuke everything. maybe we need just one call. 644 * XXX: since the first call did not release addresses, some prefixes 645 * might remain. We should call nd6_purge() again to release the 646 * prefixes after removing all addresses above. 647 * (Or can we just delay calling nd6_purge until at this point?) 648 */ 649 nd6_purge(ifp); 650 651 /* remove route to interface local allnodes multicast (ff01::1) */ 652 bzero(&sin6, sizeof(sin6)); 653 sin6.sin6_len = sizeof(struct sockaddr_in6); 654 sin6.sin6_family = AF_INET6; 655 sin6.sin6_addr = in6addr_intfacelocal_allnodes; 656 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 657 rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain); 658 if (rt && rt->rt_ifp == ifp) { 659 struct rt_addrinfo info; 660 661 bzero(&info, sizeof(info)); 662 info.rti_flags = rt->rt_flags; 663 info.rti_info[RTAX_DST] = rt_key(rt); 664 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 665 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 666 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 667 ifp->if_rdomain); 668 rtfree(rt); 669 } 670 671 /* remove route to link-local allnodes multicast (ff02::1) */ 672 bzero(&sin6, sizeof(sin6)); 673 sin6.sin6_len = sizeof(struct sockaddr_in6); 674 sin6.sin6_family = AF_INET6; 675 sin6.sin6_addr = in6addr_linklocal_allnodes; 676 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 677 rt = rtalloc(sin6tosa(&sin6), 0, ifp->if_rdomain); 678 if (rt && rt->rt_ifp == ifp) { 679 struct rt_addrinfo info; 680 681 bzero(&info, sizeof(info)); 682 info.rti_flags = rt->rt_flags; 683 info.rti_info[RTAX_DST] = rt_key(rt); 684 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 685 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 686 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 687 ifp->if_rdomain); 688 rtfree(rt); 689 } 690 691 if (ifp->if_xflags & IFXF_AUTOCONF6) { 692 nd6_rs_timeout_count--; 693 if (nd6_rs_timeout_count == 0) 694 timeout_del(&nd6_rs_output_timer); 695 if (RS_LHCOOKIE(ifp) != NULL) 696 hook_disestablish(ifp->if_linkstatehooks, 697 RS_LHCOOKIE(ifp)); 698 } 699} 700