1 /* $OpenBSD: in6_ifattach.c,v 1.51 2010/04/06 14:12:10 stsp 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 #include <dev/rndvar.h> 62 63 unsigned long in6_maxmtu = 0; 64 65 int ip6_auto_linklocal = 1; /* enable by default */ 66 67 int get_last_resort_ifid(struct ifnet *, struct in6_addr *); 68 int get_hw_ifid(struct ifnet *, struct in6_addr *); 69 int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 70 int in6_ifattach_loopback(struct ifnet *); 71 72 #define EUI64_GBIT 0x01 73 #define EUI64_UBIT 0x02 74 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 75 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 76 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 77 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 78 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 79 80 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 81 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 82 83 /* 84 * Generate a last-resort interface identifier, when the machine has no 85 * IEEE802/EUI64 address sources. 86 * The goal here is to get an interface identifier that is 87 * (1) random enough and (2) does not change across reboot. 88 * We currently use MD5(hostname) for it. 89 * 90 * in6 - upper 64bits are preserved 91 */ 92 int 93 get_last_resort_ifid(struct ifnet *ifp, struct in6_addr *in6) 94 { 95 MD5_CTX ctxt; 96 u_int8_t digest[16]; 97 98 #if 0 99 /* we need at least several letters as seed for ifid */ 100 if (hostnamelen < 3) 101 return -1; 102 #endif 103 104 /* generate 8 bytes of pseudo-random value. */ 105 bzero(&ctxt, sizeof(ctxt)); 106 MD5Init(&ctxt); 107 MD5Update(&ctxt, hostname, hostnamelen); 108 MD5Final(digest, &ctxt); 109 110 /* assumes sizeof(digest) > sizeof(ifid) */ 111 bcopy(digest, &in6->s6_addr[8], 8); 112 113 /* make sure to set "u" bit to local, and "g" bit to individual. */ 114 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 115 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 116 117 /* convert EUI64 into IPv6 interface identifier */ 118 EUI64_TO_IFID(in6); 119 120 return 0; 121 } 122 123 /* 124 * Generate a random interface identifier. 125 * 126 * in6 - upper 64bits are preserved 127 */ 128 void 129 in6_get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 130 { 131 arc4random_buf(&in6->s6_addr32[2], 8); 132 133 /* make sure to set "u" bit to local, and "g" bit to individual. */ 134 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 135 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 136 137 /* convert EUI64 into IPv6 interface identifier */ 138 EUI64_TO_IFID(in6); 139 } 140 141 /* 142 * Get interface identifier for the specified interface. 143 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 144 * 145 * in6 - upper 64bits are preserved 146 */ 147 int 148 get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 149 { 150 struct ifaddr *ifa; 151 struct sockaddr_dl *sdl; 152 char *addr; 153 size_t addrlen; 154 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 155 static u_int8_t allone[8] = 156 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 157 158 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 159 if (ifa->ifa_addr->sa_family != AF_LINK) 160 continue; 161 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 162 if (sdl == NULL) 163 continue; 164 if (sdl->sdl_alen == 0) 165 continue; 166 167 goto found; 168 } 169 170 return -1; 171 172 found: 173 addr = LLADDR(sdl); 174 addrlen = sdl->sdl_alen; 175 176 switch (ifp->if_type) { 177 case IFT_IEEE1394: 178 case IFT_IEEE80211: 179 /* IEEE1394 uses 16byte length address starting with EUI64 */ 180 if (addrlen > 8) 181 addrlen = 8; 182 break; 183 default: 184 break; 185 } 186 187 /* get EUI64 */ 188 switch (ifp->if_type) { 189 /* IEEE802/EUI64 cases - what others? */ 190 case IFT_ETHER: 191 case IFT_CARP: 192 case IFT_FDDI: 193 case IFT_ATM: 194 case IFT_IEEE1394: 195 case IFT_IEEE80211: 196 /* look at IEEE802/EUI64 only */ 197 if (addrlen != 8 && addrlen != 6) 198 return -1; 199 200 /* 201 * check for invalid MAC address - on bsdi, we see it a lot 202 * since wildboar configures all-zero MAC on pccard before 203 * card insertion. 204 */ 205 if (bcmp(addr, allzero, addrlen) == 0) 206 return -1; 207 if (bcmp(addr, allone, addrlen) == 0) 208 return -1; 209 210 /* make EUI64 address */ 211 if (addrlen == 8) 212 bcopy(addr, &in6->s6_addr[8], 8); 213 else if (addrlen == 6) { 214 in6->s6_addr[8] = addr[0]; 215 in6->s6_addr[9] = addr[1]; 216 in6->s6_addr[10] = addr[2]; 217 in6->s6_addr[11] = 0xff; 218 in6->s6_addr[12] = 0xfe; 219 in6->s6_addr[13] = addr[3]; 220 in6->s6_addr[14] = addr[4]; 221 in6->s6_addr[15] = addr[5]; 222 } 223 break; 224 225 case IFT_GIF: 226 /* 227 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 228 * however, IPv4 address is not very suitable as unique 229 * identifier source (can be renumbered). 230 * we don't do this. 231 */ 232 return -1; 233 234 default: 235 return -1; 236 } 237 238 /* sanity check: g bit must not indicate "group" */ 239 if (EUI64_GROUP(in6)) 240 return -1; 241 242 /* convert EUI64 into IPv6 interface identifier */ 243 EUI64_TO_IFID(in6); 244 245 /* 246 * sanity check: ifid must not be all zero, avoid conflict with 247 * subnet router anycast 248 */ 249 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 250 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 251 return -1; 252 } 253 254 return 0; 255 } 256 257 /* 258 * Get interface identifier for the specified interface. If it is not 259 * available on ifp0, borrow interface identifier from other information 260 * sources. 261 * 262 * altifp - secondary EUI64 source 263 */ 264 int 265 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, struct in6_addr *in6) 266 { 267 struct ifnet *ifp; 268 269 /* first, try to get it from the interface itself */ 270 if (get_hw_ifid(ifp0, in6) == 0) { 271 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 272 ifp0->if_xname)); 273 goto success; 274 } 275 276 /* try secondary EUI64 source. this basically is for ATM PVC */ 277 if (altifp && get_hw_ifid(altifp, in6) == 0) { 278 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 279 ifp0->if_xname, altifp->if_xname)); 280 goto success; 281 } 282 283 /* next, try to get it from some other hardware interface */ 284 TAILQ_FOREACH(ifp, &ifnet, if_list) { 285 if (ifp == ifp0) 286 continue; 287 if (get_hw_ifid(ifp, in6) != 0) 288 continue; 289 290 /* 291 * to borrow ifid from other interface, ifid needs to be 292 * globally unique 293 */ 294 if (IFID_UNIVERSAL(in6)) { 295 nd6log((LOG_DEBUG, 296 "%s: borrow interface identifier from %s\n", 297 ifp0->if_xname, ifp->if_xname)); 298 goto success; 299 } 300 } 301 302 /* last resort: get from random number source */ 303 if (get_last_resort_ifid(ifp, in6) == 0) { 304 nd6log((LOG_DEBUG, 305 "%s: interface identifier generated by random number\n", 306 ifp0->if_xname)); 307 goto success; 308 } 309 310 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 311 return -1; 312 313 success: 314 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 315 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 316 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 317 in6->s6_addr[14], in6->s6_addr[15])); 318 return 0; 319 } 320 321 /* 322 * altifp - secondary EUI64 source 323 */ 324 325 int 326 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 327 { 328 struct in6_ifaddr *ia; 329 struct in6_aliasreq ifra; 330 struct nd_prefix pr0; 331 int i, s, error; 332 333 /* 334 * configure link-local address. 335 */ 336 bzero(&ifra, sizeof(ifra)); 337 338 /* 339 * in6_update_ifa() does not use ifra_name, but we accurately set it 340 * for safety. 341 */ 342 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 343 344 ifra.ifra_addr.sin6_family = AF_INET6; 345 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 346 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 347 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 348 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 349 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 350 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 351 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 352 } else { 353 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 354 nd6log((LOG_ERR, 355 "%s: no ifid available\n", ifp->if_xname)); 356 return (-1); 357 } 358 } 359 360 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 361 ifra.ifra_prefixmask.sin6_family = AF_INET6; 362 ifra.ifra_prefixmask.sin6_addr = in6mask64; 363 /* link-local addresses should NEVER expire. */ 364 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 365 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 366 367 /* 368 * Do not let in6_update_ifa() do DAD, since we need a random delay 369 * before sending an NS at the first time the interface becomes up. 370 * Instead, in6_if_up() will start DAD with a proper random delay. 371 */ 372 ifra.ifra_flags |= IN6_IFF_NODAD; 373 374 /* 375 * Now call in6_update_ifa() to do a bunch of procedures to configure 376 * a link-local address. In the case of CARP, we may be called after 377 * one has already been configured, so check if it's already there 378 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 379 */ 380 s = splsoftnet(); 381 error = in6_update_ifa(ifp, &ifra, in6ifa_ifpforlinklocal(ifp, 0)); 382 splx(s); 383 384 if (error != 0) { 385 /* 386 * XXX: When the interface does not support IPv6, this call 387 * would fail in the SIOCSIFADDR ioctl. I believe the 388 * notification is rather confusing in this case, so just 389 * suppress it. (jinmei@kame.net 20010130) 390 */ 391 if (error != EAFNOSUPPORT) 392 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 393 "configure a link-local address on %s " 394 "(errno=%d)\n", 395 ifp->if_xname, error)); 396 return (-1); 397 } 398 399 /* 400 * Adjust ia6_flags so that in6_if_up will perform DAD. 401 * XXX: Some P2P interfaces seem not to send packets just after 402 * becoming up, so we skip p2p interfaces for safety. 403 */ 404 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 405 #ifdef DIAGNOSTIC 406 if (!ia) { 407 panic("ia == NULL in in6_ifattach_linklocal"); 408 /* NOTREACHED */ 409 } 410 #endif 411 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 412 (ifp->if_type == IFT_CARP)) == 0) { 413 ia->ia6_flags &= ~IN6_IFF_NODAD; 414 ia->ia6_flags |= IN6_IFF_TENTATIVE; 415 } 416 417 /* 418 * Make the link-local prefix (fe80::/64%link) as on-link. 419 * Since we'd like to manage prefixes separately from addresses, 420 * we make an ND6 prefix structure for the link-local prefix, 421 * and add it to the prefix list as a never-expire prefix. 422 * XXX: this change might affect some existing code base... 423 */ 424 bzero(&pr0, sizeof(pr0)); 425 pr0.ndpr_ifp = ifp; 426 /* this should be 64 at this moment. */ 427 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 428 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 429 pr0.ndpr_prefix = ifra.ifra_addr; 430 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 431 for (i = 0; i < 4; i++) { 432 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 433 in6mask64.s6_addr32[i]; 434 } 435 /* 436 * Initialize parameters. The link-local prefix must always be 437 * on-link, and its lifetimes never expire. 438 */ 439 pr0.ndpr_raf_onlink = 1; 440 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 441 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 442 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 443 /* 444 * Since there is no other link-local addresses, nd6_prefix_lookup() 445 * probably returns NULL. However, we cannot always expect the result. 446 * For example, if we first remove the (only) existing link-local 447 * address, and then reconfigure another one, the prefix is still 448 * valid with referring to the old link-local address. 449 */ 450 if (nd6_prefix_lookup(&pr0) == NULL) { 451 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 452 return (error); 453 } 454 455 return 0; 456 } 457 458 /* 459 * ifp - must be IFT_LOOP 460 */ 461 462 int 463 in6_ifattach_loopback(struct ifnet *ifp) 464 { 465 struct in6_aliasreq ifra; 466 int error; 467 468 bzero(&ifra, sizeof(ifra)); 469 470 /* 471 * in6_update_ifa() does not use ifra_name, but we accurately set it 472 * for safety. 473 */ 474 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 475 476 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 477 ifra.ifra_prefixmask.sin6_family = AF_INET6; 478 ifra.ifra_prefixmask.sin6_addr = in6mask128; 479 480 /* 481 * Always initialize ia_dstaddr (= broadcast address) to loopback 482 * address. Follows IPv4 practice - see in_ifinit(). 483 */ 484 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 485 ifra.ifra_dstaddr.sin6_family = AF_INET6; 486 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 487 488 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 489 ifra.ifra_addr.sin6_family = AF_INET6; 490 ifra.ifra_addr.sin6_addr = in6addr_loopback; 491 492 /* the loopback address should NEVER expire. */ 493 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 494 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 495 496 /* we don't need to perform DAD on loopback interfaces. */ 497 ifra.ifra_flags |= IN6_IFF_NODAD; 498 499 /* 500 * We are sure that this is a newly assigned address, so we can set 501 * NULL to the 3rd arg. 502 */ 503 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 504 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 505 "the loopback address on %s (errno=%d)\n", 506 ifp->if_xname, error)); 507 return (-1); 508 } 509 510 return 0; 511 } 512 513 /* 514 * compute NI group address, based on the current hostname setting. 515 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 516 * 517 * when ifp == NULL, the caller is responsible for filling scopeid. 518 */ 519 int 520 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 521 struct sockaddr_in6 *sa6) 522 { 523 const char *p; 524 u_int8_t *q; 525 MD5_CTX ctxt; 526 u_int8_t digest[16]; 527 u_int8_t l; 528 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 529 530 if (!namelen || !name) 531 return -1; 532 533 p = name; 534 while (p && *p && *p != '.' && p - name < namelen) 535 p++; 536 if (p - name > sizeof(n) - 1) 537 return -1; /* label too long */ 538 l = p - name; 539 strncpy((char *)n, name, l); 540 n[(int)l] = '\0'; 541 for (q = n; *q; q++) { 542 if ('A' <= *q && *q <= 'Z') 543 *q = *q - 'A' + 'a'; 544 } 545 546 /* generate 8 bytes of pseudo-random value. */ 547 bzero(&ctxt, sizeof(ctxt)); 548 MD5Init(&ctxt); 549 MD5Update(&ctxt, &l, sizeof(l)); 550 MD5Update(&ctxt, n, l); 551 MD5Final(digest, &ctxt); 552 553 bzero(sa6, sizeof(*sa6)); 554 sa6->sin6_family = AF_INET6; 555 sa6->sin6_len = sizeof(*sa6); 556 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 557 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 558 sa6->sin6_addr.s6_addr8[11] = 2; 559 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 560 sizeof(sa6->sin6_addr.s6_addr32[3])); 561 562 return 0; 563 } 564 565 /* 566 * XXX multiple loopback interface needs more care. for instance, 567 * nodelocal address needs to be configured onto only one of them. 568 * XXX multiple link-local address case 569 * 570 * altifp - secondary EUI64 source 571 */ 572 void 573 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 574 { 575 struct in6_ifaddr *ia; 576 struct in6_addr in6; 577 578 /* some of the interfaces are inherently not IPv6 capable */ 579 switch (ifp->if_type) { 580 case IFT_BRIDGE: 581 case IFT_ENC: 582 case IFT_PFLOG: 583 case IFT_PFSYNC: 584 return; 585 } 586 587 /* 588 * if link mtu is too small, don't try to configure IPv6. 589 * remember there could be some link-layer that has special 590 * fragmentation logic. 591 */ 592 if (ifp->if_mtu < IPV6_MMTU) { 593 nd6log((LOG_INFO, "in6_ifattach: " 594 "%s has too small MTU, IPv6 not enabled\n", 595 ifp->if_xname)); 596 return; 597 } 598 599 /* create a multicast kludge storage (if we have not had one) */ 600 in6_createmkludge(ifp); 601 602 /* 603 * quirks based on interface type 604 */ 605 switch (ifp->if_type) { 606 /* we attach a link-local address when a vhid is assigned */ 607 case IFT_CARP: 608 return; 609 default: 610 break; 611 } 612 613 /* 614 * usually, we require multicast capability to the interface 615 */ 616 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 617 nd6log((LOG_INFO, "in6_ifattach: " 618 "%s is not multicast capable, IPv6 not enabled\n", 619 ifp->if_xname)); 620 return; 621 } 622 623 /* 624 * assign loopback address for loopback interface. 625 * XXX multiple loopback interface case. 626 */ 627 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 628 in6 = in6addr_loopback; 629 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 630 if (in6_ifattach_loopback(ifp) != 0) 631 return; 632 } 633 } 634 635 /* 636 * assign a link-local address, if there's none. 637 */ 638 if (ip6_auto_linklocal) { 639 ia = in6ifa_ifpforlinklocal(ifp, 0); 640 if (ia == NULL) { 641 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 642 /* linklocal address assigned */ 643 } else { 644 /* failed to assign linklocal address. bark? */ 645 } 646 } 647 } 648 } 649 650 /* 651 * NOTE: in6_ifdetach() does not support loopback if at this moment. 652 */ 653 void 654 in6_ifdetach(struct ifnet *ifp) 655 { 656 struct in6_ifaddr *ia, *oia; 657 struct ifaddr *ifa, *next; 658 struct rtentry *rt; 659 struct sockaddr_in6 sin6; 660 struct in6_multi_mship *imm; 661 662 #ifdef MROUTING 663 /* remove ip6_mrouter stuff */ 664 ip6_mrouter_detach(ifp); 665 #endif 666 667 /* remove neighbor management table */ 668 nd6_purge(ifp); 669 670 /* nuke any of IPv6 addresses we have */ 671 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 672 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 673 next = TAILQ_NEXT(ifa, ifa_list); 674 if (ifa->ifa_addr->sa_family != AF_INET6) 675 continue; 676 in6_purgeaddr(ifa); 677 } 678 679 /* undo everything done by in6_ifattach(), just in case */ 680 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 681 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 682 next = TAILQ_NEXT(ifa, ifa_list); 683 684 if (ifa->ifa_addr->sa_family != AF_INET6 685 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 686 continue; 687 } 688 689 ia = (struct in6_ifaddr *)ifa; 690 691 /* 692 * leave from multicast groups we have joined for the interface 693 */ 694 while (!LIST_EMPTY(&ia->ia6_memberships)) { 695 imm = LIST_FIRST(&ia->ia6_memberships); 696 LIST_REMOVE(imm, i6mm_chain); 697 in6_leavegroup(imm); 698 } 699 700 /* remove from the routing table */ 701 if ((ia->ia_flags & IFA_ROUTE) && 702 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0))) { 703 struct rt_addrinfo info; 704 u_int8_t prio; 705 706 bzero(&info, sizeof(info)); 707 info.rti_flags = rt->rt_flags; 708 prio = rt->rt_priority; 709 info.rti_info[RTAX_DST] = 710 (struct sockaddr *)&ia->ia_addr; 711 info.rti_info[RTAX_GATEWAY] = 712 (struct sockaddr *)&ia->ia_addr; 713 info.rti_info[RTAX_NETMASK] = 714 (struct sockaddr *)&ia->ia_prefixmask; 715 rtfree(rt); 716 rtrequest1(RTM_DELETE, &info, prio, NULL, 0); 717 } 718 719 /* remove from the linked list */ 720 ifa_del(ifp, (struct ifaddr *)ia); 721 IFAFREE(&ia->ia_ifa); 722 723 /* also remove from the IPv6 address chain(itojun&jinmei) */ 724 oia = ia; 725 if (oia == (ia = in6_ifaddr)) 726 in6_ifaddr = ia->ia_next; 727 else { 728 while (ia->ia_next && (ia->ia_next != oia)) 729 ia = ia->ia_next; 730 if (ia->ia_next) 731 ia->ia_next = oia->ia_next; 732 else { 733 nd6log((LOG_ERR, 734 "%s: didn't unlink in6ifaddr from list\n", 735 ifp->if_xname)); 736 } 737 } 738 739 IFAFREE(&oia->ia_ifa); 740 } 741 742 /* cleanup multicast address kludge table, if there is any */ 743 in6_purgemkludge(ifp); 744 745 /* 746 * remove neighbor management table. we call it twice just to make 747 * sure we nuke everything. maybe we need just one call. 748 * XXX: since the first call did not release addresses, some prefixes 749 * might remain. We should call nd6_purge() again to release the 750 * prefixes after removing all addresses above. 751 * (Or can we just delay calling nd6_purge until at this point?) 752 */ 753 nd6_purge(ifp); 754 755 /* remove route to link-local allnodes multicast (ff02::1) */ 756 bzero(&sin6, sizeof(sin6)); 757 sin6.sin6_len = sizeof(struct sockaddr_in6); 758 sin6.sin6_family = AF_INET6; 759 sin6.sin6_addr = in6addr_linklocal_allnodes; 760 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 761 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 762 if (rt && rt->rt_ifp == ifp) { 763 struct rt_addrinfo info; 764 765 bzero(&info, sizeof(info)); 766 info.rti_flags = rt->rt_flags; 767 info.rti_info[RTAX_DST] = rt_key(rt); 768 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 769 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 770 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 0); 771 rtfree(rt); 772 } 773 } 774