in6_ifattach.c revision 1.32
1/* $OpenBSD: in6_ifattach.c,v 1.32 2002/09/12 01:11:54 itojun 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#include <sys/md5k.h> 41 42#include <net/if.h> 43#include <net/if_dl.h> 44#include <net/if_types.h> 45#include <net/route.h> 46 47#include <netinet/in.h> 48#include <netinet/in_var.h> 49#include <netinet/if_ether.h> 50 51#include <netinet/ip6.h> 52#include <netinet6/ip6_var.h> 53#include <netinet6/in6_ifattach.h> 54#include <netinet6/ip6_var.h> 55#include <netinet6/nd6.h> 56 57unsigned long in6_maxmtu = 0; 58 59int ip6_auto_linklocal = 1; /* enable by default */ 60 61static int get_rand_ifid(struct ifnet *, struct in6_addr *); 62static int get_hw_ifid(struct ifnet *, struct in6_addr *); 63static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 64static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 65static int in6_ifattach_loopback(struct ifnet *); 66 67#define EUI64_GBIT 0x01 68#define EUI64_UBIT 0x02 69#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 70#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 71#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 72#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 73#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 74 75#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 76#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 77 78/* 79 * Generate a last-resort interface identifier, when the machine has no 80 * IEEE802/EUI64 address sources. 81 * The goal here is to get an interface identifier that is 82 * (1) random enough and (2) does not change across reboot. 83 * We currently use MD5(hostname) for it. 84 */ 85static int 86get_rand_ifid(ifp, in6) 87 struct ifnet *ifp; 88 struct in6_addr *in6; /* upper 64bits are preserved */ 89{ 90 MD5_CTX ctxt; 91 u_int8_t digest[16]; 92 93#if 0 94 /* we need at least several letters as seed for ifid */ 95 if (hostnamelen < 3) 96 return -1; 97#endif 98 99 /* generate 8 bytes of pseudo-random value. */ 100 bzero(&ctxt, sizeof(ctxt)); 101 MD5Init(&ctxt); 102 MD5Update(&ctxt, hostname, hostnamelen); 103 MD5Final(digest, &ctxt); 104 105 /* assumes sizeof(digest) > sizeof(ifid) */ 106 bcopy(digest, &in6->s6_addr[8], 8); 107 108 /* make sure to set "u" bit to local, and "g" bit to individual. */ 109 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 110 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 111 112 /* convert EUI64 into IPv6 interface identifier */ 113 EUI64_TO_IFID(in6); 114 115 return 0; 116} 117 118/* 119 * Get interface identifier for the specified interface. 120 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 121 */ 122static int 123get_hw_ifid(ifp, in6) 124 struct ifnet *ifp; 125 struct in6_addr *in6; /* upper 64bits are preserved */ 126{ 127 struct ifaddr *ifa; 128 struct sockaddr_dl *sdl; 129 char *addr; 130 size_t addrlen; 131 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 132 static u_int8_t allone[8] = 133 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 134 135 for (ifa = ifp->if_addrlist.tqh_first; 136 ifa; 137 ifa = ifa->ifa_list.tqe_next) 138 { 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 152found: 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_FDDI: 172 case IFT_ATM: 173 case IFT_IEEE1394: 174 case IFT_IEEE80211: 175 /* look at IEEE802/EUI64 only */ 176 if (addrlen != 8 && addrlen != 6) 177 return -1; 178 179 /* 180 * check for invalid MAC address - on bsdi, we see it a lot 181 * since wildboar configures all-zero MAC on pccard before 182 * card insertion. 183 */ 184 if (bcmp(addr, allzero, addrlen) == 0) 185 return -1; 186 if (bcmp(addr, allone, addrlen) == 0) 187 return -1; 188 189 /* make EUI64 address */ 190 if (addrlen == 8) 191 bcopy(addr, &in6->s6_addr[8], 8); 192 else if (addrlen == 6) { 193 in6->s6_addr[8] = addr[0]; 194 in6->s6_addr[9] = addr[1]; 195 in6->s6_addr[10] = addr[2]; 196 in6->s6_addr[11] = 0xff; 197 in6->s6_addr[12] = 0xfe; 198 in6->s6_addr[13] = addr[3]; 199 in6->s6_addr[14] = addr[4]; 200 in6->s6_addr[15] = addr[5]; 201 } 202 break; 203 204 case IFT_ARCNET: 205 if (addrlen != 1) 206 return -1; 207 if (!addr[0]) 208 return -1; 209 210 bzero(&in6->s6_addr[8], 8); 211 in6->s6_addr[15] = addr[0]; 212 213 /* 214 * due to insufficient bitwidth, we mark it local. 215 */ 216 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 217 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 218 break; 219 220 case IFT_GIF: 221#ifdef IFT_STF 222 case IFT_STF: 223#endif 224 /* 225 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 226 * however, IPv4 address is not very suitable as unique 227 * identifier source (can be renumbered). 228 * we don't do this. 229 */ 230 return -1; 231 232 default: 233 return -1; 234 } 235 236 /* sanity check: g bit must not indicate "group" */ 237 if (EUI64_GROUP(in6)) 238 return -1; 239 240 /* convert EUI64 into IPv6 interface identifier */ 241 EUI64_TO_IFID(in6); 242 243 /* 244 * sanity check: ifid must not be all zero, avoid conflict with 245 * subnet router anycast 246 */ 247 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 248 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 249 return -1; 250 } 251 252 return 0; 253} 254 255/* 256 * Get interface identifier for the specified interface. If it is not 257 * available on ifp0, borrow interface identifier from other information 258 * sources. 259 */ 260static int 261get_ifid(ifp0, altifp, in6) 262 struct ifnet *ifp0; 263 struct ifnet *altifp; /* secondary EUI64 source */ 264 struct in6_addr *in6; 265{ 266 struct ifnet *ifp; 267 268 /* first, try to get it from the interface itself */ 269 if (get_hw_ifid(ifp0, in6) == 0) { 270 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 271 ifp0->if_xname)); 272 goto success; 273 } 274 275 /* try secondary EUI64 source. this basically is for ATM PVC */ 276 if (altifp && get_hw_ifid(altifp, in6) == 0) { 277 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 278 ifp0->if_xname, altifp->if_xname)); 279 goto success; 280 } 281 282 /* next, try to get it from some other hardware interface */ 283 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 284 { 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_rand_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 313success: 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 321static int 322in6_ifattach_linklocal(ifp, altifp) 323 struct ifnet *ifp; 324 struct ifnet *altifp; /*secondary EUI64 source*/ 325{ 326 struct in6_ifaddr *ia; 327 struct in6_aliasreq ifra; 328 struct nd_prefix pr0; 329 int i, error; 330 331 /* 332 * configure link-local address. 333 */ 334 bzero(&ifra, sizeof(ifra)); 335 336 /* 337 * in6_update_ifa() does not use ifra_name, but we accurately set it 338 * for safety. 339 */ 340 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 341 342 ifra.ifra_addr.sin6_family = AF_INET6; 343 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 344 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 345 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 346 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 347 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 348 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 349 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 350 } else { 351 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 352 nd6log((LOG_ERR, 353 "%s: no ifid available\n", ifp->if_xname)); 354 return (-1); 355 } 356 } 357 358 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 359 ifra.ifra_prefixmask.sin6_family = AF_INET6; 360 ifra.ifra_prefixmask.sin6_addr = in6mask64; 361#ifdef SCOPEDROUTING 362 /* take into account the sin6_scope_id field for routing */ 363 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 364#endif 365 /* link-local addresses should NEVER expire. */ 366 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 367 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 368 369 /* 370 * Do not let in6_update_ifa() do DAD, since we need a random delay 371 * before sending an NS at the first time the interface becomes up. 372 * Instead, in6_if_up() will start DAD with a proper random delay. 373 */ 374 ifra.ifra_flags |= IN6_IFF_NODAD; 375 376 /* 377 * Now call in6_update_ifa() to do a bunch of procedures to configure 378 * a link-local address. We can set NULL to the 3rd argument, because 379 * we know there's no other link-local address on the interface 380 * and therefore we are adding one (instead of updating one). 381 */ 382 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 383 /* 384 * XXX: When the interface does not support IPv6, this call 385 * would fail in the SIOCSIFADDR ioctl. I believe the 386 * notification is rather confusing in this case, so just 387 * suppress it. (jinmei@kame.net 20010130) 388 */ 389 if (error != EAFNOSUPPORT) 390 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 391 "configure a link-local address on %s " 392 "(errno=%d)\n", 393 ifp->if_xname, error)); 394 return (-1); 395 } 396 397 /* 398 * Adjust ia6_flags so that in6_if_up will perform DAD. 399 * XXX: Some P2P interfaces seem not to send packets just after 400 * becoming up, so we skip p2p interfaces for safety. 401 */ 402 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 403#ifdef DIAGNOSTIC 404 if (!ia) { 405 panic("ia == NULL in in6_ifattach_linklocal"); 406 /* NOTREACHED */ 407 } 408#endif 409 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 410 ia->ia6_flags &= ~IN6_IFF_NODAD; 411 ia->ia6_flags |= IN6_IFF_TENTATIVE; 412 } 413 414 /* 415 * Make the link-local prefix (fe80::/64%link) as on-link. 416 * Since we'd like to manage prefixes separately from addresses, 417 * we make an ND6 prefix structure for the link-local prefix, 418 * and add it to the prefix list as a never-expire prefix. 419 * XXX: this change might affect some existing code base... 420 */ 421 bzero(&pr0, sizeof(pr0)); 422 pr0.ndpr_ifp = ifp; 423 /* this should be 64 at this moment. */ 424 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 425 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 426 pr0.ndpr_prefix = ifra.ifra_addr; 427 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 428 for (i = 0; i < 4; i++) { 429 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 430 in6mask64.s6_addr32[i]; 431 } 432 /* 433 * Initialize parameters. The link-local prefix must always be 434 * on-link, and its lifetimes never expire. 435 */ 436 pr0.ndpr_raf_onlink = 1; 437 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 438 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 439 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 440 /* 441 * Since there is no other link-local addresses, nd6_prefix_lookup() 442 * probably returns NULL. However, we cannot always expect the result. 443 * For example, if we first remove the (only) existing link-local 444 * address, and then reconfigure another one, the prefix is still 445 * valid with referring to the old link-local address. 446 */ 447 if (nd6_prefix_lookup(&pr0) == NULL) { 448 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 449 return (error); 450 } 451 452 return 0; 453} 454 455static int 456in6_ifattach_loopback(ifp) 457 struct ifnet *ifp; /* must be IFT_LOOP */ 458{ 459 struct in6_aliasreq ifra; 460 int error; 461 462 bzero(&ifra, sizeof(ifra)); 463 464 /* 465 * in6_update_ifa() does not use ifra_name, but we accurately set it 466 * for safety. 467 */ 468 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 469 470 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 471 ifra.ifra_prefixmask.sin6_family = AF_INET6; 472 ifra.ifra_prefixmask.sin6_addr = in6mask128; 473 474 /* 475 * Always initialize ia_dstaddr (= broadcast address) to loopback 476 * address. Follows IPv4 practice - see in_ifinit(). 477 */ 478 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 479 ifra.ifra_dstaddr.sin6_family = AF_INET6; 480 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 481 482 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 483 ifra.ifra_addr.sin6_family = AF_INET6; 484 ifra.ifra_addr.sin6_addr = in6addr_loopback; 485 486 /* the loopback address should NEVER expire. */ 487 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 488 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 489 490 /* we don't need to perform DAD on loopback interfaces. */ 491 ifra.ifra_flags |= IN6_IFF_NODAD; 492 493 /* 494 * We are sure that this is a newly assigned address, so we can set 495 * NULL to the 3rd arg. 496 */ 497 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 498 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 499 "the loopback address on %s (errno=%d)\n", 500 ifp->if_xname, error)); 501 return (-1); 502 } 503 504 return 0; 505} 506 507/* 508 * compute NI group address, based on the current hostname setting. 509 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 510 * 511 * when ifp == NULL, the caller is responsible for filling scopeid. 512 */ 513int 514in6_nigroup(ifp, name, namelen, sa6) 515 struct ifnet *ifp; 516 const char *name; 517 int namelen; 518 struct sockaddr_in6 *sa6; 519{ 520 const char *p; 521 u_int8_t *q; 522 MD5_CTX ctxt; 523 u_int8_t digest[16]; 524 u_int8_t l; 525 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 526 527 if (!namelen || !name) 528 return -1; 529 530 p = name; 531 while (p && *p && *p != '.' && p - name < namelen) 532 p++; 533 if (p - name > sizeof(n) - 1) 534 return -1; /* label too long */ 535 l = p - name; 536 strncpy((char *)n, name, l); 537 n[(int)l] = '\0'; 538 for (q = n; *q; q++) { 539 if ('A' <= *q && *q <= 'Z') 540 *q = *q - 'A' + 'a'; 541 } 542 543 /* generate 8 bytes of pseudo-random value. */ 544 bzero(&ctxt, sizeof(ctxt)); 545 MD5Init(&ctxt); 546 MD5Update(&ctxt, &l, sizeof(l)); 547 MD5Update(&ctxt, n, l); 548 MD5Final(digest, &ctxt); 549 550 bzero(sa6, sizeof(*sa6)); 551 sa6->sin6_family = AF_INET6; 552 sa6->sin6_len = sizeof(*sa6); 553 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 554 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 555 sa6->sin6_addr.s6_addr8[11] = 2; 556 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 557 sizeof(sa6->sin6_addr.s6_addr32[3])); 558 559 return 0; 560} 561 562/* 563 * XXX multiple loopback interface needs more care. for instance, 564 * nodelocal address needs to be configured onto only one of them. 565 * XXX multiple link-local address case 566 */ 567void 568in6_ifattach(ifp, altifp) 569 struct ifnet *ifp; 570 struct ifnet *altifp; /* secondary EUI64 source */ 571{ 572 struct in6_ifaddr *ia; 573 struct in6_addr in6; 574 575 /* some of the interfaces are inherently not IPv6 capable */ 576 switch (ifp->if_type) { 577 case IFT_BRIDGE: 578 case IFT_ENC: 579 case IFT_PFLOG: 580 return; 581 case IFT_PROPVIRTUAL: 582 if (strncmp("bridge", ifp->if_xname, sizeof("bridge")) == 0 && 583 '0' <= ifp->if_xname[sizeof("bridge")] && 584 ifp->if_xname[sizeof("bridge")] <= '9') 585 return; 586 break; 587 } 588 589 /* 590 * if link mtu is too small, don't try to configure IPv6. 591 * remember there could be some link-layer that has special 592 * fragmentation logic. 593 */ 594 if (ifp->if_mtu < IPV6_MMTU) { 595 nd6log((LOG_INFO, "in6_ifattach: " 596 "%s has too small MTU, IPv6 not enabled\n", 597 ifp->if_xname)); 598 return; 599 } 600 601 /* create a multicast kludge storage (if we have not had one) */ 602 in6_createmkludge(ifp); 603 604 /* 605 * quirks based on interface type 606 */ 607 switch (ifp->if_type) { 608#ifdef IFT_STF 609 case IFT_STF: 610 /* 611 * 6to4 interface is a very special kind of beast. 612 * no multicast, no linklocal. RFC2529 specifies how to make 613 * linklocals for 6to4 interface, but there's no use and 614 * it is rather harmful to have one. 615 */ 616 return; 617#endif 618 default: 619 break; 620 } 621 622 /* 623 * usually, we require multicast capability to the interface 624 */ 625 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 626 nd6log((LOG_INFO, "in6_ifattach: " 627 "%s is not multicast capable, IPv6 not enabled\n", 628 ifp->if_xname)); 629 return; 630 } 631 632 /* 633 * assign loopback address for loopback interface. 634 * XXX multiple loopback interface case. 635 */ 636 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 637 in6 = in6addr_loopback; 638 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 639 if (in6_ifattach_loopback(ifp) != 0) 640 return; 641 } 642 } 643 644 /* 645 * assign a link-local address, if there's none. 646 */ 647 if (ip6_auto_linklocal) { 648 ia = in6ifa_ifpforlinklocal(ifp, 0); 649 if (ia == NULL) { 650 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 651 /* linklocal address assigned */ 652 } else { 653 /* failed to assign linklocal address. bark? */ 654 } 655 } 656 } 657} 658 659/* 660 * NOTE: in6_ifdetach() does not support loopback if at this moment. 661 */ 662void 663in6_ifdetach(ifp) 664 struct ifnet *ifp; 665{ 666 struct in6_ifaddr *ia, *oia; 667 struct ifaddr *ifa, *next; 668 struct rtentry *rt; 669 short rtflags; 670 struct sockaddr_in6 sin6; 671 struct in6_multi_mship *imm; 672 673 /* remove neighbor management table */ 674 nd6_purge(ifp); 675 676 /* nuke any of IPv6 addresses we have */ 677 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 678 { 679 next = ifa->ifa_list.tqe_next; 680 if (ifa->ifa_addr->sa_family != AF_INET6) 681 continue; 682 in6_purgeaddr(ifa); 683 } 684 685 /* undo everything done by in6_ifattach(), just in case */ 686 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 687 { 688 next = ifa->ifa_list.tqe_next; 689 690 if (ifa->ifa_addr->sa_family != AF_INET6 691 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 692 continue; 693 } 694 695 ia = (struct in6_ifaddr *)ifa; 696 697 /* 698 * leave from multicast groups we have joined for the interface 699 */ 700 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 701 LIST_REMOVE(imm, i6mm_chain); 702 in6_leavegroup(imm); 703 } 704 705 /* remove from the routing table */ 706 if ((ia->ia_flags & IFA_ROUTE) && 707 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 708 rtflags = rt->rt_flags; 709 rtfree(rt); 710 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 711 (struct sockaddr *)&ia->ia_addr, 712 (struct sockaddr *)&ia->ia_prefixmask, 713 rtflags, (struct rtentry **)0); 714 } 715 716 /* remove from the linked list */ 717 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 718 IFAFREE(&ia->ia_ifa); 719 720 /* also remove from the IPv6 address chain(itojun&jinmei) */ 721 oia = ia; 722 if (oia == (ia = in6_ifaddr)) 723 in6_ifaddr = ia->ia_next; 724 else { 725 while (ia->ia_next && (ia->ia_next != oia)) 726 ia = ia->ia_next; 727 if (ia->ia_next) 728 ia->ia_next = oia->ia_next; 729 else { 730 nd6log((LOG_ERR, 731 "%s: didn't unlink in6ifaddr from list\n", 732 ifp->if_xname)); 733 } 734 } 735 736 IFAFREE(&oia->ia_ifa); 737 } 738 739 /* cleanup multicast address kludge table, if there is any */ 740 in6_purgemkludge(ifp); 741 742 /* 743 * remove neighbor management table. we call it twice just to make 744 * sure we nuke everything. maybe we need just one call. 745 * XXX: since the first call did not release addresses, some prefixes 746 * might remain. We should call nd6_purge() again to release the 747 * prefixes after removing all addresses above. 748 * (Or can we just delay calling nd6_purge until at this point?) 749 */ 750 nd6_purge(ifp); 751 752 /* remove route to link-local allnodes multicast (ff02::1) */ 753 bzero(&sin6, sizeof(sin6)); 754 sin6.sin6_len = sizeof(struct sockaddr_in6); 755 sin6.sin6_family = AF_INET6; 756 sin6.sin6_addr = in6addr_linklocal_allnodes; 757 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 758 rt = rtalloc1((struct sockaddr *)&sin6, 0); 759 if (rt && rt->rt_ifp == ifp) { 760 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 761 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 762 rtfree(rt); 763 } 764} 765