in6_ifattach.c revision 1.42
1/* $OpenBSD: in6_ifattach.c,v 1.42 2006/06/16 16:49:40 henning 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 61unsigned long in6_maxmtu = 0; 62 63int ip6_auto_linklocal = 1; /* enable by default */ 64 65static int get_rand_ifid(struct ifnet *, struct in6_addr *); 66static int get_hw_ifid(struct ifnet *, struct in6_addr *); 67static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 68static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 69static int in6_ifattach_loopback(struct ifnet *); 70 71#define EUI64_GBIT 0x01 72#define EUI64_UBIT 0x02 73#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 74#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 75#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 76#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 77#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 78 79#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 80#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 81 82/* 83 * Generate a last-resort interface identifier, when the machine has no 84 * IEEE802/EUI64 address sources. 85 * The goal here is to get an interface identifier that is 86 * (1) random enough and (2) does not change across reboot. 87 * We currently use MD5(hostname) for it. 88 */ 89static int 90get_rand_ifid(ifp, in6) 91 struct ifnet *ifp; 92 struct in6_addr *in6; /* upper 64bits are preserved */ 93{ 94 MD5_CTX ctxt; 95 u_int8_t digest[16]; 96 97#if 0 98 /* we need at least several letters as seed for ifid */ 99 if (hostnamelen < 3) 100 return -1; 101#endif 102 103 /* generate 8 bytes of pseudo-random value. */ 104 bzero(&ctxt, sizeof(ctxt)); 105 MD5Init(&ctxt); 106 MD5Update(&ctxt, hostname, hostnamelen); 107 MD5Final(digest, &ctxt); 108 109 /* assumes sizeof(digest) > sizeof(ifid) */ 110 bcopy(digest, &in6->s6_addr[8], 8); 111 112 /* make sure to set "u" bit to local, and "g" bit to individual. */ 113 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 114 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 115 116 /* convert EUI64 into IPv6 interface identifier */ 117 EUI64_TO_IFID(in6); 118 119 return 0; 120} 121 122/* 123 * Get interface identifier for the specified interface. 124 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 125 */ 126static int 127get_hw_ifid(ifp, in6) 128 struct ifnet *ifp; 129 struct in6_addr *in6; /* upper 64bits are preserved */ 130{ 131 struct ifaddr *ifa; 132 struct sockaddr_dl *sdl; 133 char *addr; 134 size_t addrlen; 135 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 136 static u_int8_t allone[8] = 137 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 138 139 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 140 if (ifa->ifa_addr->sa_family != AF_LINK) 141 continue; 142 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 143 if (sdl == NULL) 144 continue; 145 if (sdl->sdl_alen == 0) 146 continue; 147 148 goto found; 149 } 150 151 return -1; 152 153found: 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_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_ARCNET: 206 if (addrlen != 1) 207 return -1; 208 if (!addr[0]) 209 return -1; 210 211 bzero(&in6->s6_addr[8], 8); 212 in6->s6_addr[15] = addr[0]; 213 214 /* 215 * due to insufficient bitwidth, we mark it local. 216 */ 217 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 218 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 219 break; 220 221 case IFT_GIF: 222 /* 223 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 224 * however, IPv4 address is not very suitable as unique 225 * identifier source (can be renumbered). 226 * we don't do this. 227 */ 228 return -1; 229 230 default: 231 return -1; 232 } 233 234 /* sanity check: g bit must not indicate "group" */ 235 if (EUI64_GROUP(in6)) 236 return -1; 237 238 /* convert EUI64 into IPv6 interface identifier */ 239 EUI64_TO_IFID(in6); 240 241 /* 242 * sanity check: ifid must not be all zero, avoid conflict with 243 * subnet router anycast 244 */ 245 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 246 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 247 return -1; 248 } 249 250 return 0; 251} 252 253/* 254 * Get interface identifier for the specified interface. If it is not 255 * available on ifp0, borrow interface identifier from other information 256 * sources. 257 */ 258static int 259get_ifid(ifp0, altifp, in6) 260 struct ifnet *ifp0; 261 struct ifnet *altifp; /* secondary EUI64 source */ 262 struct in6_addr *in6; 263{ 264 struct ifnet *ifp; 265 266 /* first, try to get it from the interface itself */ 267 if (get_hw_ifid(ifp0, in6) == 0) { 268 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 269 ifp0->if_xname)); 270 goto success; 271 } 272 273 /* try secondary EUI64 source. this basically is for ATM PVC */ 274 if (altifp && get_hw_ifid(altifp, in6) == 0) { 275 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 276 ifp0->if_xname, altifp->if_xname)); 277 goto success; 278 } 279 280 /* next, try to get it from some other hardware interface */ 281 TAILQ_FOREACH(ifp, &ifnet, if_list) { 282 if (ifp == ifp0) 283 continue; 284 if (get_hw_ifid(ifp, in6) != 0) 285 continue; 286 287 /* 288 * to borrow ifid from other interface, ifid needs to be 289 * globally unique 290 */ 291 if (IFID_UNIVERSAL(in6)) { 292 nd6log((LOG_DEBUG, 293 "%s: borrow interface identifier from %s\n", 294 ifp0->if_xname, ifp->if_xname)); 295 goto success; 296 } 297 } 298 299 /* last resort: get from random number source */ 300 if (get_rand_ifid(ifp, in6) == 0) { 301 nd6log((LOG_DEBUG, 302 "%s: interface identifier generated by random number\n", 303 ifp0->if_xname)); 304 goto success; 305 } 306 307 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 308 return -1; 309 310success: 311 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 312 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 313 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 314 in6->s6_addr[14], in6->s6_addr[15])); 315 return 0; 316} 317 318static int 319in6_ifattach_linklocal(ifp, altifp) 320 struct ifnet *ifp; 321 struct ifnet *altifp; /*secondary EUI64 source*/ 322{ 323 struct in6_ifaddr *ia; 324 struct in6_aliasreq ifra; 325 struct nd_prefix pr0; 326 int i, error; 327 328 /* 329 * configure link-local address. 330 */ 331 bzero(&ifra, sizeof(ifra)); 332 333 /* 334 * in6_update_ifa() does not use ifra_name, but we accurately set it 335 * for safety. 336 */ 337 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 338 339 ifra.ifra_addr.sin6_family = AF_INET6; 340 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 341 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 342 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 343 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 344 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 345 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 346 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 347 } else { 348 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 349 nd6log((LOG_ERR, 350 "%s: no ifid available\n", ifp->if_xname)); 351 return (-1); 352 } 353 } 354 355 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 356 ifra.ifra_prefixmask.sin6_family = AF_INET6; 357 ifra.ifra_prefixmask.sin6_addr = in6mask64; 358#ifdef SCOPEDROUTING 359 /* take into account the sin6_scope_id field for routing */ 360 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 361#endif 362 /* link-local addresses should NEVER expire. */ 363 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 364 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 365 366 /* 367 * Do not let in6_update_ifa() do DAD, since we need a random delay 368 * before sending an NS at the first time the interface becomes up. 369 * Instead, in6_if_up() will start DAD with a proper random delay. 370 */ 371 ifra.ifra_flags |= IN6_IFF_NODAD; 372 373 /* 374 * Now call in6_update_ifa() to do a bunch of procedures to configure 375 * a link-local address. We can set NULL to the 3rd argument, because 376 * we know there's no other link-local address on the interface 377 * and therefore we are adding one (instead of updating one). 378 */ 379 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 380 /* 381 * XXX: When the interface does not support IPv6, this call 382 * would fail in the SIOCSIFADDR ioctl. I believe the 383 * notification is rather confusing in this case, so just 384 * suppress it. (jinmei@kame.net 20010130) 385 */ 386 if (error != EAFNOSUPPORT) 387 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 388 "configure a link-local address on %s " 389 "(errno=%d)\n", 390 ifp->if_xname, error)); 391 return (-1); 392 } 393 394 /* 395 * Adjust ia6_flags so that in6_if_up will perform DAD. 396 * XXX: Some P2P interfaces seem not to send packets just after 397 * becoming up, so we skip p2p interfaces for safety. 398 */ 399 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 400#ifdef DIAGNOSTIC 401 if (!ia) { 402 panic("ia == NULL in in6_ifattach_linklocal"); 403 /* NOTREACHED */ 404 } 405#endif 406 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 407 ia->ia6_flags &= ~IN6_IFF_NODAD; 408 ia->ia6_flags |= IN6_IFF_TENTATIVE; 409 } 410 411 /* 412 * Make the link-local prefix (fe80::/64%link) as on-link. 413 * Since we'd like to manage prefixes separately from addresses, 414 * we make an ND6 prefix structure for the link-local prefix, 415 * and add it to the prefix list as a never-expire prefix. 416 * XXX: this change might affect some existing code base... 417 */ 418 bzero(&pr0, sizeof(pr0)); 419 pr0.ndpr_ifp = ifp; 420 /* this should be 64 at this moment. */ 421 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 422 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 423 pr0.ndpr_prefix = ifra.ifra_addr; 424 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 425 for (i = 0; i < 4; i++) { 426 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 427 in6mask64.s6_addr32[i]; 428 } 429 /* 430 * Initialize parameters. The link-local prefix must always be 431 * on-link, and its lifetimes never expire. 432 */ 433 pr0.ndpr_raf_onlink = 1; 434 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 435 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 436 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 437 /* 438 * Since there is no other link-local addresses, nd6_prefix_lookup() 439 * probably returns NULL. However, we cannot always expect the result. 440 * For example, if we first remove the (only) existing link-local 441 * address, and then reconfigure another one, the prefix is still 442 * valid with referring to the old link-local address. 443 */ 444 if (nd6_prefix_lookup(&pr0) == NULL) { 445 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 446 return (error); 447 } 448 449 return 0; 450} 451 452static int 453in6_ifattach_loopback(ifp) 454 struct ifnet *ifp; /* must be IFT_LOOP */ 455{ 456 struct in6_aliasreq ifra; 457 int error; 458 459 bzero(&ifra, sizeof(ifra)); 460 461 /* 462 * in6_update_ifa() does not use ifra_name, but we accurately set it 463 * for safety. 464 */ 465 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 466 467 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 468 ifra.ifra_prefixmask.sin6_family = AF_INET6; 469 ifra.ifra_prefixmask.sin6_addr = in6mask128; 470 471 /* 472 * Always initialize ia_dstaddr (= broadcast address) to loopback 473 * address. Follows IPv4 practice - see in_ifinit(). 474 */ 475 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 476 ifra.ifra_dstaddr.sin6_family = AF_INET6; 477 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 478 479 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 480 ifra.ifra_addr.sin6_family = AF_INET6; 481 ifra.ifra_addr.sin6_addr = in6addr_loopback; 482 483 /* the loopback address should NEVER expire. */ 484 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 485 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 486 487 /* we don't need to perform DAD on loopback interfaces. */ 488 ifra.ifra_flags |= IN6_IFF_NODAD; 489 490 /* 491 * We are sure that this is a newly assigned address, so we can set 492 * NULL to the 3rd arg. 493 */ 494 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 495 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 496 "the loopback address on %s (errno=%d)\n", 497 ifp->if_xname, error)); 498 return (-1); 499 } 500 501 return 0; 502} 503 504/* 505 * compute NI group address, based on the current hostname setting. 506 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 507 * 508 * when ifp == NULL, the caller is responsible for filling scopeid. 509 */ 510int 511in6_nigroup(ifp, name, namelen, sa6) 512 struct ifnet *ifp; 513 const char *name; 514 int namelen; 515 struct sockaddr_in6 *sa6; 516{ 517 const char *p; 518 u_int8_t *q; 519 MD5_CTX ctxt; 520 u_int8_t digest[16]; 521 u_int8_t l; 522 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 523 524 if (!namelen || !name) 525 return -1; 526 527 p = name; 528 while (p && *p && *p != '.' && p - name < namelen) 529 p++; 530 if (p - name > sizeof(n) - 1) 531 return -1; /* label too long */ 532 l = p - name; 533 strncpy((char *)n, name, l); 534 n[(int)l] = '\0'; 535 for (q = n; *q; q++) { 536 if ('A' <= *q && *q <= 'Z') 537 *q = *q - 'A' + 'a'; 538 } 539 540 /* generate 8 bytes of pseudo-random value. */ 541 bzero(&ctxt, sizeof(ctxt)); 542 MD5Init(&ctxt); 543 MD5Update(&ctxt, &l, sizeof(l)); 544 MD5Update(&ctxt, n, l); 545 MD5Final(digest, &ctxt); 546 547 bzero(sa6, sizeof(*sa6)); 548 sa6->sin6_family = AF_INET6; 549 sa6->sin6_len = sizeof(*sa6); 550 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 551 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 552 sa6->sin6_addr.s6_addr8[11] = 2; 553 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 554 sizeof(sa6->sin6_addr.s6_addr32[3])); 555 556 return 0; 557} 558 559/* 560 * XXX multiple loopback interface needs more care. for instance, 561 * nodelocal address needs to be configured onto only one of them. 562 * XXX multiple link-local address case 563 */ 564void 565in6_ifattach(ifp, altifp) 566 struct ifnet *ifp; 567 struct ifnet *altifp; /* secondary EUI64 source */ 568{ 569 struct in6_ifaddr *ia; 570 struct in6_addr in6; 571 572 /* some of the interfaces are inherently not IPv6 capable */ 573 switch (ifp->if_type) { 574 case IFT_BRIDGE: 575 case IFT_ENC: 576 case IFT_PFLOG: 577 case IFT_PFSYNC: 578 return; 579 } 580 581 /* 582 * if link mtu is too small, don't try to configure IPv6. 583 * remember there could be some link-layer that has special 584 * fragmentation logic. 585 */ 586 if (ifp->if_mtu < IPV6_MMTU) { 587 nd6log((LOG_INFO, "in6_ifattach: " 588 "%s has too small MTU, IPv6 not enabled\n", 589 ifp->if_xname)); 590 return; 591 } 592 593 /* create a multicast kludge storage (if we have not had one) */ 594 in6_createmkludge(ifp); 595 596 /* 597 * quirks based on interface type 598 */ 599 switch (ifp->if_type) { 600 case IFT_CARP: 601 return; 602 default: 603 break; 604 } 605 606 /* 607 * usually, we require multicast capability to the interface 608 */ 609 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 610 nd6log((LOG_INFO, "in6_ifattach: " 611 "%s is not multicast capable, IPv6 not enabled\n", 612 ifp->if_xname)); 613 return; 614 } 615 616 /* 617 * assign loopback address for loopback interface. 618 * XXX multiple loopback interface case. 619 */ 620 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 621 in6 = in6addr_loopback; 622 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 623 if (in6_ifattach_loopback(ifp) != 0) 624 return; 625 } 626 } 627 628 /* 629 * assign a link-local address, if there's none. 630 */ 631 if (ip6_auto_linklocal) { 632 ia = in6ifa_ifpforlinklocal(ifp, 0); 633 if (ia == NULL) { 634 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 635 /* linklocal address assigned */ 636 } else { 637 /* failed to assign linklocal address. bark? */ 638 } 639 } 640 } 641} 642 643/* 644 * NOTE: in6_ifdetach() does not support loopback if at this moment. 645 */ 646void 647in6_ifdetach(ifp) 648 struct ifnet *ifp; 649{ 650 struct in6_ifaddr *ia, *oia; 651 struct ifaddr *ifa, *next; 652 struct rtentry *rt; 653 short rtflags; 654 struct sockaddr_in6 sin6; 655 struct in6_multi_mship *imm; 656 657#ifdef MROUTING 658 /* remove ip6_mrouter stuff */ 659 ip6_mrouter_detach(ifp); 660#endif 661 662 /* remove neighbor management table */ 663 nd6_purge(ifp); 664 665 /* nuke any of IPv6 addresses we have */ 666 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 667 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 668 next = TAILQ_NEXT(ifa, ifa_list); 669 if (ifa->ifa_addr->sa_family != AF_INET6) 670 continue; 671 in6_purgeaddr(ifa); 672 } 673 674 /* undo everything done by in6_ifattach(), just in case */ 675 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 676 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 677 next = TAILQ_NEXT(ifa, ifa_list); 678 679 if (ifa->ifa_addr->sa_family != AF_INET6 680 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 681 continue; 682 } 683 684 ia = (struct in6_ifaddr *)ifa; 685 686 /* 687 * leave from multicast groups we have joined for the interface 688 */ 689 while (!LIST_EMPTY(&ia->ia6_memberships)) { 690 imm = LIST_FIRST(&ia->ia6_memberships); 691 LIST_REMOVE(imm, i6mm_chain); 692 in6_leavegroup(imm); 693 } 694 695 /* remove from the routing table */ 696 if ((ia->ia_flags & IFA_ROUTE) && 697 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0))) { 698 rtflags = rt->rt_flags; 699 rtfree(rt); 700 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 701 (struct sockaddr *)&ia->ia_addr, 702 (struct sockaddr *)&ia->ia_prefixmask, 703 rtflags, (struct rtentry **)0, 0); 704 } 705 706 /* remove from the linked list */ 707 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 708 IFAFREE(&ia->ia_ifa); 709 710 /* also remove from the IPv6 address chain(itojun&jinmei) */ 711 oia = ia; 712 if (oia == (ia = in6_ifaddr)) 713 in6_ifaddr = ia->ia_next; 714 else { 715 while (ia->ia_next && (ia->ia_next != oia)) 716 ia = ia->ia_next; 717 if (ia->ia_next) 718 ia->ia_next = oia->ia_next; 719 else { 720 nd6log((LOG_ERR, 721 "%s: didn't unlink in6ifaddr from list\n", 722 ifp->if_xname)); 723 } 724 } 725 726 IFAFREE(&oia->ia_ifa); 727 } 728 729 /* cleanup multicast address kludge table, if there is any */ 730 in6_purgemkludge(ifp); 731 732 /* 733 * remove neighbor management table. we call it twice just to make 734 * sure we nuke everything. maybe we need just one call. 735 * XXX: since the first call did not release addresses, some prefixes 736 * might remain. We should call nd6_purge() again to release the 737 * prefixes after removing all addresses above. 738 * (Or can we just delay calling nd6_purge until at this point?) 739 */ 740 nd6_purge(ifp); 741 742 /* remove route to link-local allnodes multicast (ff02::1) */ 743 bzero(&sin6, sizeof(sin6)); 744 sin6.sin6_len = sizeof(struct sockaddr_in6); 745 sin6.sin6_family = AF_INET6; 746 sin6.sin6_addr = in6addr_linklocal_allnodes; 747 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 748 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 749 if (rt && rt->rt_ifp == ifp) { 750 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 751 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0, 0); 752 rtfree(rt); 753 } 754} 755