1 /* $OpenBSD: in6_ifattach.c,v 1.48 2009/01/30 10:47:46 mcbride 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/malloc.h> 36 #include <sys/socket.h> 37 #include <sys/sockio.h> 38 #include <sys/kernel.h> 39 #include <sys/syslog.h> 40 41 #include <crypto/md5.h> 42 43 #include <net/if.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/in_var.h> 50 #include <netinet/if_ether.h> 51 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 61 unsigned long in6_maxmtu = 0; 62 63 int ip6_auto_linklocal = 1; /* enable by default */ 64 65 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 66 static int get_hw_ifid(struct ifnet *, struct in6_addr *); 67 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 68 static int 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 */ 90 static int 91 get_rand_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 * Get interface identifier for the specified interface. 123 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 124 * 125 * in6 - upper 64bits are preserved 126 */ 127 static int 128 get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 129 { 130 struct ifaddr *ifa; 131 struct sockaddr_dl *sdl; 132 char *addr; 133 size_t addrlen; 134 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 135 static u_int8_t allone[8] = 136 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 137 138 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 139 if (ifa->ifa_addr->sa_family != AF_LINK) 140 continue; 141 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 142 if (sdl == NULL) 143 continue; 144 if (sdl->sdl_alen == 0) 145 continue; 146 147 goto found; 148 } 149 150 return -1; 151 152 found: 153 addr = LLADDR(sdl); 154 addrlen = sdl->sdl_alen; 155 156 switch (ifp->if_type) { 157 case IFT_IEEE1394: 158 case IFT_IEEE80211: 159 /* IEEE1394 uses 16byte length address starting with EUI64 */ 160 if (addrlen > 8) 161 addrlen = 8; 162 break; 163 default: 164 break; 165 } 166 167 /* get EUI64 */ 168 switch (ifp->if_type) { 169 /* IEEE802/EUI64 cases - what others? */ 170 case IFT_ETHER: 171 case IFT_CARP: 172 case IFT_FDDI: 173 case IFT_ATM: 174 case IFT_IEEE1394: 175 case IFT_IEEE80211: 176 /* look at IEEE802/EUI64 only */ 177 if (addrlen != 8 && addrlen != 6) 178 return -1; 179 180 /* 181 * check for invalid MAC address - on bsdi, we see it a lot 182 * since wildboar configures all-zero MAC on pccard before 183 * card insertion. 184 */ 185 if (bcmp(addr, allzero, addrlen) == 0) 186 return -1; 187 if (bcmp(addr, allone, addrlen) == 0) 188 return -1; 189 190 /* make EUI64 address */ 191 if (addrlen == 8) 192 bcopy(addr, &in6->s6_addr[8], 8); 193 else if (addrlen == 6) { 194 in6->s6_addr[8] = addr[0]; 195 in6->s6_addr[9] = addr[1]; 196 in6->s6_addr[10] = addr[2]; 197 in6->s6_addr[11] = 0xff; 198 in6->s6_addr[12] = 0xfe; 199 in6->s6_addr[13] = addr[3]; 200 in6->s6_addr[14] = addr[4]; 201 in6->s6_addr[15] = addr[5]; 202 } 203 break; 204 205 case IFT_GIF: 206 /* 207 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 208 * however, IPv4 address is not very suitable as unique 209 * identifier source (can be renumbered). 210 * we don't do this. 211 */ 212 return -1; 213 214 default: 215 return -1; 216 } 217 218 /* sanity check: g bit must not indicate "group" */ 219 if (EUI64_GROUP(in6)) 220 return -1; 221 222 /* convert EUI64 into IPv6 interface identifier */ 223 EUI64_TO_IFID(in6); 224 225 /* 226 * sanity check: ifid must not be all zero, avoid conflict with 227 * subnet router anycast 228 */ 229 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 230 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 231 return -1; 232 } 233 234 return 0; 235 } 236 237 /* 238 * Get interface identifier for the specified interface. If it is not 239 * available on ifp0, borrow interface identifier from other information 240 * sources. 241 * 242 * altifp - secondary EUI64 source 243 */ 244 static int 245 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 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 /* try secondary EUI64 source. this basically is for ATM PVC */ 257 if (altifp && get_hw_ifid(altifp, in6) == 0) { 258 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 259 ifp0->if_xname, altifp->if_xname)); 260 goto success; 261 } 262 263 /* next, try to get it from some other hardware interface */ 264 TAILQ_FOREACH(ifp, &ifnet, if_list) { 265 if (ifp == ifp0) 266 continue; 267 if (get_hw_ifid(ifp, in6) != 0) 268 continue; 269 270 /* 271 * to borrow ifid from other interface, ifid needs to be 272 * globally unique 273 */ 274 if (IFID_UNIVERSAL(in6)) { 275 nd6log((LOG_DEBUG, 276 "%s: borrow interface identifier from %s\n", 277 ifp0->if_xname, ifp->if_xname)); 278 goto success; 279 } 280 } 281 282 /* last resort: get from random number source */ 283 if (get_rand_ifid(ifp, in6) == 0) { 284 nd6log((LOG_DEBUG, 285 "%s: interface identifier generated by random number\n", 286 ifp0->if_xname)); 287 goto success; 288 } 289 290 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 291 return -1; 292 293 success: 294 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 295 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 296 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 297 in6->s6_addr[14], in6->s6_addr[15])); 298 return 0; 299 } 300 301 /* 302 * altifp - secondary EUI64 source 303 */ 304 305 int 306 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 307 { 308 struct in6_ifaddr *ia; 309 struct in6_aliasreq ifra; 310 struct nd_prefix pr0; 311 int i, s, error; 312 313 /* 314 * configure link-local address. 315 */ 316 bzero(&ifra, sizeof(ifra)); 317 318 /* 319 * in6_update_ifa() does not use ifra_name, but we accurately set it 320 * for safety. 321 */ 322 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 323 324 ifra.ifra_addr.sin6_family = AF_INET6; 325 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 326 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 327 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 328 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 329 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 330 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 331 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 332 } else { 333 if (get_ifid(ifp, altifp, &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 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 385 #ifdef DIAGNOSTIC 386 if (!ia) { 387 panic("ia == 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 ia->ia6_flags &= ~IN6_IFF_NODAD; 394 ia->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 */ 441 442 static int 443 in6_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 */ 499 int 500 in6_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 * 550 * altifp - secondary EUI64 source 551 */ 552 void 553 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 554 { 555 struct in6_ifaddr *ia; 556 struct in6_addr in6; 557 558 /* some of the interfaces are inherently not IPv6 capable */ 559 switch (ifp->if_type) { 560 case IFT_BRIDGE: 561 case IFT_ENC: 562 case IFT_PFLOG: 563 case IFT_PFSYNC: 564 return; 565 } 566 567 /* 568 * if link mtu is too small, don't try to configure IPv6. 569 * remember there could be some link-layer that has special 570 * fragmentation logic. 571 */ 572 if (ifp->if_mtu < IPV6_MMTU) { 573 nd6log((LOG_INFO, "in6_ifattach: " 574 "%s has too small MTU, IPv6 not enabled\n", 575 ifp->if_xname)); 576 return; 577 } 578 579 /* create a multicast kludge storage (if we have not had one) */ 580 in6_createmkludge(ifp); 581 582 /* 583 * quirks based on interface type 584 */ 585 switch (ifp->if_type) { 586 /* we attach a link-local address when a vhid is assigned */ 587 case IFT_CARP: 588 return; 589 default: 590 break; 591 } 592 593 /* 594 * usually, we require multicast capability to the interface 595 */ 596 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 597 nd6log((LOG_INFO, "in6_ifattach: " 598 "%s is not multicast capable, IPv6 not enabled\n", 599 ifp->if_xname)); 600 return; 601 } 602 603 /* 604 * assign loopback address for loopback interface. 605 * XXX multiple loopback interface case. 606 */ 607 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 608 in6 = in6addr_loopback; 609 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 610 if (in6_ifattach_loopback(ifp) != 0) 611 return; 612 } 613 } 614 615 /* 616 * assign a link-local address, if there's none. 617 */ 618 if (ip6_auto_linklocal) { 619 ia = in6ifa_ifpforlinklocal(ifp, 0); 620 if (ia == NULL) { 621 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 622 /* linklocal address assigned */ 623 } else { 624 /* failed to assign linklocal address. bark? */ 625 } 626 } 627 } 628 } 629 630 /* 631 * NOTE: in6_ifdetach() does not support loopback if at this moment. 632 */ 633 void 634 in6_ifdetach(struct ifnet *ifp) 635 { 636 struct in6_ifaddr *ia, *oia; 637 struct ifaddr *ifa, *next; 638 struct rtentry *rt; 639 struct sockaddr_in6 sin6; 640 struct in6_multi_mship *imm; 641 642 #ifdef MROUTING 643 /* remove ip6_mrouter stuff */ 644 ip6_mrouter_detach(ifp); 645 #endif 646 647 /* remove neighbor management table */ 648 nd6_purge(ifp); 649 650 /* nuke any of IPv6 addresses we have */ 651 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 652 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 653 next = TAILQ_NEXT(ifa, ifa_list); 654 if (ifa->ifa_addr->sa_family != AF_INET6) 655 continue; 656 in6_purgeaddr(ifa); 657 } 658 659 /* undo everything done by in6_ifattach(), just in case */ 660 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 661 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 662 next = TAILQ_NEXT(ifa, ifa_list); 663 664 if (ifa->ifa_addr->sa_family != AF_INET6 665 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 666 continue; 667 } 668 669 ia = (struct in6_ifaddr *)ifa; 670 671 /* 672 * leave from multicast groups we have joined for the interface 673 */ 674 while (!LIST_EMPTY(&ia->ia6_memberships)) { 675 imm = LIST_FIRST(&ia->ia6_memberships); 676 LIST_REMOVE(imm, i6mm_chain); 677 in6_leavegroup(imm); 678 } 679 680 /* remove from the routing table */ 681 if ((ia->ia_flags & IFA_ROUTE) && 682 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0))) { 683 struct rt_addrinfo info; 684 u_int8_t prio; 685 686 bzero(&info, sizeof(info)); 687 info.rti_flags = rt->rt_flags; 688 prio = rt->rt_priority; 689 info.rti_info[RTAX_DST] = 690 (struct sockaddr *)&ia->ia_addr; 691 info.rti_info[RTAX_GATEWAY] = 692 (struct sockaddr *)&ia->ia_addr; 693 info.rti_info[RTAX_NETMASK] = 694 (struct sockaddr *)&ia->ia_prefixmask; 695 rtfree(rt); 696 rtrequest1(RTM_DELETE, &info, prio, NULL, 0); 697 } 698 699 /* remove from the linked list */ 700 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 701 IFAFREE(&ia->ia_ifa); 702 703 /* also remove from the IPv6 address chain(itojun&jinmei) */ 704 oia = ia; 705 if (oia == (ia = in6_ifaddr)) 706 in6_ifaddr = ia->ia_next; 707 else { 708 while (ia->ia_next && (ia->ia_next != oia)) 709 ia = ia->ia_next; 710 if (ia->ia_next) 711 ia->ia_next = oia->ia_next; 712 else { 713 nd6log((LOG_ERR, 714 "%s: didn't unlink in6ifaddr from list\n", 715 ifp->if_xname)); 716 } 717 } 718 719 IFAFREE(&oia->ia_ifa); 720 } 721 722 /* cleanup multicast address kludge table, if there is any */ 723 in6_purgemkludge(ifp); 724 725 /* 726 * remove neighbor management table. we call it twice just to make 727 * sure we nuke everything. maybe we need just one call. 728 * XXX: since the first call did not release addresses, some prefixes 729 * might remain. We should call nd6_purge() again to release the 730 * prefixes after removing all addresses above. 731 * (Or can we just delay calling nd6_purge until at this point?) 732 */ 733 nd6_purge(ifp); 734 735 /* remove route to link-local allnodes multicast (ff02::1) */ 736 bzero(&sin6, sizeof(sin6)); 737 sin6.sin6_len = sizeof(struct sockaddr_in6); 738 sin6.sin6_family = AF_INET6; 739 sin6.sin6_addr = in6addr_linklocal_allnodes; 740 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 741 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 742 if (rt && rt->rt_ifp == ifp) { 743 struct rt_addrinfo info; 744 745 bzero(&info, sizeof(info)); 746 info.rti_flags = rt->rt_flags; 747 info.rti_info[RTAX_DST] = rt_key(rt); 748 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 749 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 750 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 0); 751 rtfree(rt); 752 } 753 } 754