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sys/netinet6/in6_ifattach.c
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1 /* $NetBSD: in6_ifattach.c,v 1.61 2004/04/20 17:12:03 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/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: in6_ifattach.c,v 1.61 2004/04/20 17:12:03 itojun Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/socket.h> 40 #include <sys/sockio.h> 41 #include <sys/kernel.h> 42 #include <sys/syslog.h> 43 #include <sys/md5.h> 44 45 #include <net/if.h> 46 #include <net/if_dl.h> 47 #include <net/if_types.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_var.h> 52 53 #include <netinet/ip6.h> 54 #include <netinet6/in6_ifattach.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet6/nd6.h> 57 #include <netinet6/ip6_mroute.h> 58 59 #include <net/net_osdep.h> 60 61 unsigned long in6_maxmtu = 0; 62 63 int ip6_auto_linklocal = 1; /* enable by default */ 64 65 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 66 static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); 67 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 68 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 69 static int in6_ifattach_loopback __P((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 (/*CONSTCOND*/ 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 */ 89 static int 90 get_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, (u_char *)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 */ 126 static int 127 get_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 for (ifa = ifp->if_addrlist.tqh_first; 140 ifa; 141 ifa = ifa->ifa_list.tqe_next) 142 { 143 if (ifa->ifa_addr->sa_family != AF_LINK) 144 continue; 145 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 146 if (sdl == NULL) 147 continue; 148 if (sdl->sdl_alen == 0) 149 continue; 150 151 goto found; 152 } 153 154 return -1; 155 156 found: 157 addr = LLADDR(sdl); 158 addrlen = sdl->sdl_alen; 159 160 switch (ifp->if_type) { 161 case IFT_IEEE1394: 162 case IFT_IEEE80211: 163 /* IEEE1394 uses 16byte length address starting with EUI64 */ 164 if (addrlen > 8) 165 addrlen = 8; 166 break; 167 default: 168 break; 169 } 170 171 /* get EUI64 */ 172 switch (ifp->if_type) { 173 /* IEEE802/EUI64 cases - what others? */ 174 case IFT_ETHER: 175 case IFT_FDDI: 176 case IFT_ATM: 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_ARCNET: 209 if (addrlen != 1) 210 return -1; 211 if (!addr[0]) 212 return -1; 213 214 bzero(&in6->s6_addr[8], 8); 215 in6->s6_addr[15] = addr[0]; 216 217 /* 218 * due to insufficient bitwidth, we mark it local. 219 */ 220 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 221 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 222 break; 223 224 case IFT_GIF: 225 #ifdef IFT_STF 226 case IFT_STF: 227 #endif 228 /* 229 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 230 * however, IPv4 address is not very suitable as unique 231 * identifier source (can be renumbered). 232 * we don't do this. 233 */ 234 return -1; 235 236 default: 237 return -1; 238 } 239 240 /* sanity check: g bit must not indicate "group" */ 241 if (EUI64_GROUP(in6)) 242 return -1; 243 244 /* convert EUI64 into IPv6 interface identifier */ 245 EUI64_TO_IFID(in6); 246 247 /* 248 * sanity check: ifid must not be all zero, avoid conflict with 249 * subnet router anycast 250 */ 251 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 252 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 253 return -1; 254 } 255 256 return 0; 257 } 258 259 /* 260 * Get interface identifier for the specified interface. If it is not 261 * available on ifp0, borrow interface identifier from other information 262 * sources. 263 */ 264 static int 265 get_ifid(ifp0, altifp, in6) 266 struct ifnet *ifp0; 267 struct ifnet *altifp; /*secondary EUI64 source*/ 268 struct in6_addr *in6; 269 { 270 struct ifnet *ifp; 271 272 /* first, try to get it from the interface itself */ 273 if (get_hw_ifid(ifp0, in6) == 0) { 274 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 275 if_name(ifp0))); 276 goto success; 277 } 278 279 /* try secondary EUI64 source. this basically is for ATM PVC */ 280 if (altifp && get_hw_ifid(altifp, in6) == 0) { 281 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 282 if_name(ifp0), if_name(altifp))); 283 goto success; 284 } 285 286 /* next, try to get it from some other hardware interface */ 287 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 288 { 289 if (ifp == ifp0) 290 continue; 291 if (get_hw_ifid(ifp, in6) != 0) 292 continue; 293 294 /* 295 * to borrow ifid from other interface, ifid needs to be 296 * globally unique 297 */ 298 if (IFID_UNIVERSAL(in6)) { 299 nd6log((LOG_DEBUG, 300 "%s: borrow interface identifier from %s\n", 301 if_name(ifp0), if_name(ifp))); 302 goto success; 303 } 304 } 305 306 /* last resort: get from random number source */ 307 if (get_rand_ifid(ifp, in6) == 0) { 308 nd6log((LOG_DEBUG, 309 "%s: interface identifier generated by random number\n", 310 if_name(ifp0))); 311 goto success; 312 } 313 314 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 315 return -1; 316 317 success: 318 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 319 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 320 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 321 in6->s6_addr[14], in6->s6_addr[15])); 322 return 0; 323 } 324 325 static int 326 in6_ifattach_linklocal(ifp, altifp) 327 struct ifnet *ifp; 328 struct ifnet *altifp; /*secondary EUI64 source*/ 329 { 330 struct in6_ifaddr *ia; 331 struct in6_aliasreq ifra; 332 struct nd_prefix pr0; 333 int i, error; 334 335 /* 336 * configure link-local address. 337 */ 338 bzero(&ifra, sizeof(ifra)); 339 340 /* 341 * in6_update_ifa() does not use ifra_name, but we accurately set it 342 * for safety. 343 */ 344 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 345 346 ifra.ifra_addr.sin6_family = AF_INET6; 347 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 348 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 349 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 350 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 351 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 352 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 353 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 354 } else { 355 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 356 nd6log((LOG_ERR, 357 "%s: no ifid available\n", if_name(ifp))); 358 return (-1); 359 } 360 } 361 362 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 363 ifra.ifra_prefixmask.sin6_family = AF_INET6; 364 ifra.ifra_prefixmask.sin6_addr = in6mask64; 365 #ifdef SCOPEDROUTING 366 /* take into account the sin6_scope_id field for routing */ 367 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 368 #endif 369 /* link-local addresses should NEVER expire. */ 370 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 371 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 372 373 /* 374 * Do not let in6_update_ifa() do DAD, since we need a random delay 375 * before sending an NS at the first time the interface becomes up. 376 * Instead, in6_if_up() will start DAD with a proper random delay. 377 */ 378 ifra.ifra_flags |= IN6_IFF_NODAD; 379 380 /* 381 * Now call in6_update_ifa() to do a bunch of procedures to configure 382 * a link-local address. We can set NULL to the 3rd argument, because 383 * we know there's no other link-local address on the interface 384 * and therefore we are adding one (instead of updating one). 385 */ 386 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 387 /* 388 * XXX: When the interface does not support IPv6, this call 389 * would fail in the SIOCSIFADDR ioctl. I believe the 390 * notification is rather confusing in this case, so just 391 * suppress it. (jinmei@kame.net 20010130) 392 */ 393 if (error != EAFNOSUPPORT) 394 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 395 "configure a link-local address on %s " 396 "(errno=%d)\n", 397 if_name(ifp), error)); 398 return (-1); 399 } 400 401 /* 402 * Adjust ia6_flags so that in6_if_up will perform DAD. 403 * XXX: Some P2P interfaces seem not to send packets just after 404 * becoming up, so we skip p2p interfaces for safety. 405 */ 406 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 407 #ifdef DIAGNOSTIC 408 if (!ia) { 409 panic("ia == NULL in in6_ifattach_linklocal"); 410 /* NOTREACHED */ 411 } 412 #endif 413 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 414 ia->ia6_flags &= ~IN6_IFF_NODAD; 415 ia->ia6_flags |= IN6_IFF_TENTATIVE; 416 } 417 418 /* 419 * Make the link-local prefix (fe80::/64%link) as on-link. 420 * Since we'd like to manage prefixes separately from addresses, 421 * we make an ND6 prefix structure for the link-local prefix, 422 * and add it to the prefix list as a never-expire prefix. 423 * XXX: this change might affect some existing code base... 424 */ 425 bzero(&pr0, sizeof(pr0)); 426 pr0.ndpr_ifp = ifp; 427 /* this should be 64 at this moment. */ 428 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 429 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 430 pr0.ndpr_prefix = ifra.ifra_addr; 431 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 432 for (i = 0; i < 4; i++) { 433 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 434 in6mask64.s6_addr32[i]; 435 } 436 /* 437 * Initialize parameters. The link-local prefix must always be 438 * on-link, and its lifetimes never expire. 439 */ 440 pr0.ndpr_raf_onlink = 1; 441 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 442 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 443 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 444 /* 445 * Since there is no other link-local addresses, nd6_prefix_lookup() 446 * probably returns NULL. However, we cannot always expect the result. 447 * For example, if we first remove the (only) existing link-local 448 * address, and then reconfigure another one, the prefix is still 449 * valid with referring to the old link-local address. 450 */ 451 if (nd6_prefix_lookup(&pr0) == NULL) { 452 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 453 return (error); 454 } 455 456 return 0; 457 } 458 459 static int 460 in6_ifattach_loopback(ifp) 461 struct ifnet *ifp; /* must be IFT_LOOP */ 462 { 463 struct in6_aliasreq ifra; 464 int error; 465 466 bzero(&ifra, sizeof(ifra)); 467 468 /* 469 * in6_update_ifa() does not use ifra_name, but we accurately set it 470 * for safety. 471 */ 472 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 473 474 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 475 ifra.ifra_prefixmask.sin6_family = AF_INET6; 476 ifra.ifra_prefixmask.sin6_addr = in6mask128; 477 478 /* 479 * Always initialize ia_dstaddr (= broadcast address) to loopback 480 * address. Follows IPv4 practice - see in_ifinit(). 481 */ 482 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 483 ifra.ifra_dstaddr.sin6_family = AF_INET6; 484 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 485 486 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 487 ifra.ifra_addr.sin6_family = AF_INET6; 488 ifra.ifra_addr.sin6_addr = in6addr_loopback; 489 490 /* the loopback address should NEVER expire. */ 491 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 492 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 493 494 /* we don't need to perform DAD on loopback interfaces. */ 495 ifra.ifra_flags |= IN6_IFF_NODAD; 496 497 /* 498 * We are sure that this is a newly assigned address, so we can set 499 * NULL to the 3rd arg. 500 */ 501 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 502 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 503 "the loopback address on %s (errno=%d)\n", 504 if_name(ifp), error)); 505 return (-1); 506 } 507 508 return 0; 509 } 510 511 /* 512 * compute NI group address, based on the current hostname setting. 513 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 514 * 515 * when ifp == NULL, the caller is responsible for filling scopeid. 516 */ 517 int 518 in6_nigroup(ifp, name, namelen, sa6) 519 struct ifnet *ifp; 520 const char *name; 521 int namelen; 522 struct sockaddr_in6 *sa6; 523 { 524 const char *p; 525 u_int8_t *q; 526 MD5_CTX ctxt; 527 u_int8_t digest[16]; 528 u_int8_t l; 529 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 530 531 if (!namelen || !name) 532 return -1; 533 534 p = name; 535 while (p && *p && *p != '.' && p - name < namelen) 536 p++; 537 if (p - name > sizeof(n) - 1) 538 return -1; /* label too long */ 539 l = p - name; 540 strncpy((char *)n, name, l); 541 n[(int)l] = '\0'; 542 for (q = n; *q; q++) { 543 if ('A' <= *q && *q <= 'Z') 544 *q = *q - 'A' + 'a'; 545 } 546 547 /* generate 8 bytes of pseudo-random value. */ 548 bzero(&ctxt, sizeof(ctxt)); 549 MD5Init(&ctxt); 550 MD5Update(&ctxt, &l, sizeof(l)); 551 MD5Update(&ctxt, n, l); 552 MD5Final(digest, &ctxt); 553 554 bzero(sa6, sizeof(*sa6)); 555 sa6->sin6_family = AF_INET6; 556 sa6->sin6_len = sizeof(*sa6); 557 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 558 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 559 sa6->sin6_addr.s6_addr8[11] = 2; 560 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 561 sizeof(sa6->sin6_addr.s6_addr32[3])); 562 563 return 0; 564 } 565 566 /* 567 * XXX multiple loopback interface needs more care. for instance, 568 * nodelocal address needs to be configured onto only one of them. 569 * XXX multiple link-local address case 570 */ 571 void 572 in6_ifattach(ifp, altifp) 573 struct ifnet *ifp; 574 struct ifnet *altifp; /* secondary EUI64 source */ 575 { 576 struct in6_ifaddr *ia; 577 struct in6_addr in6; 578 579 /* some of the interfaces are inherently not IPv6 capable */ 580 switch (ifp->if_type) { 581 case IFT_BRIDGE: 582 #ifdef IFT_PFLOG 583 case IFT_PFLOG: 584 #endif 585 #ifdef IFT_PFSYNC 586 case IFT_PFSYNC: 587 #endif 588 return; 589 } 590 591 /* 592 * if link mtu is too small, don't try to configure IPv6. 593 * remember there could be some link-layer that has special 594 * fragmentation logic. 595 */ 596 if (ifp->if_mtu < IPV6_MMTU) { 597 nd6log((LOG_INFO, "in6_ifattach: " 598 "%s has too small MTU, IPv6 not enabled\n", 599 if_name(ifp))); 600 return; 601 } 602 603 /* create a multicast kludge storage (if we have not had one) */ 604 in6_createmkludge(ifp); 605 606 /* 607 * quirks based on interface type 608 */ 609 switch (ifp->if_type) { 610 #ifdef IFT_STF 611 case IFT_STF: 612 /* 613 * 6to4 interface is a very special kind of beast. 614 * no multicast, no linklocal. RFC2529 specifies how to make 615 * linklocals for 6to4 interface, but there's no use and 616 * it is rather harmful to have one. 617 */ 618 return; 619 #endif 620 default: 621 break; 622 } 623 624 /* 625 * usually, we require multicast capability to the interface 626 */ 627 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 628 nd6log((LOG_INFO, "in6_ifattach: " 629 "%s is not multicast capable, IPv6 not enabled\n", 630 if_name(ifp))); 631 return; 632 } 633 634 /* 635 * assign loopback address for loopback interface. 636 * XXX multiple loopback interface case. 637 */ 638 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 639 in6 = in6addr_loopback; 640 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 641 if (in6_ifattach_loopback(ifp) != 0) 642 return; 643 } 644 } 645 646 /* 647 * assign a link-local address, if there's none. 648 */ 649 if (ip6_auto_linklocal) { 650 ia = in6ifa_ifpforlinklocal(ifp, 0); 651 if (ia == NULL) { 652 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 653 /* linklocal address assigned */ 654 } else { 655 /* failed to assign linklocal address. bark? */ 656 } 657 } 658 } 659 } 660 661 /* 662 * NOTE: in6_ifdetach() does not support loopback if at this moment. 663 * We don't need this function in bsdi, because interfaces are never removed 664 * from the ifnet list in bsdi. 665 */ 666 void 667 in6_ifdetach(ifp) 668 struct ifnet *ifp; 669 { 670 struct in6_ifaddr *ia, *oia; 671 struct ifaddr *ifa, *next; 672 struct rtentry *rt; 673 short rtflags; 674 struct sockaddr_in6 sin6; 675 struct in6_multi_mship *imm; 676 677 /* remove ip6_mrouter stuff */ 678 ip6_mrouter_detach(ifp); 679 680 /* remove neighbor management table */ 681 nd6_purge(ifp); 682 683 /* nuke any of IPv6 addresses we have */ 684 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 685 { 686 next = ifa->ifa_list.tqe_next; 687 if (ifa->ifa_addr->sa_family != AF_INET6) 688 continue; 689 in6_purgeaddr(ifa); 690 } 691 692 /* undo everything done by in6_ifattach(), just in case */ 693 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 694 { 695 next = ifa->ifa_list.tqe_next; 696 697 if (ifa->ifa_addr->sa_family != AF_INET6 698 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 699 continue; 700 } 701 702 ia = (struct in6_ifaddr *)ifa; 703 704 /* 705 * leave from multicast groups we have joined for the interface 706 */ 707 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 708 LIST_REMOVE(imm, i6mm_chain); 709 in6_leavegroup(imm); 710 } 711 712 /* remove from the routing table */ 713 if ((ia->ia_flags & IFA_ROUTE) && 714 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 715 rtflags = rt->rt_flags; 716 rtfree(rt); 717 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 718 (struct sockaddr *)&ia->ia_addr, 719 (struct sockaddr *)&ia->ia_prefixmask, 720 rtflags, (struct rtentry **)0); 721 } 722 723 /* remove from the linked list */ 724 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 725 IFAFREE(&ia->ia_ifa); 726 727 /* also remove from the IPv6 address chain(itojun&jinmei) */ 728 oia = ia; 729 if (oia == (ia = in6_ifaddr)) 730 in6_ifaddr = ia->ia_next; 731 else { 732 while (ia->ia_next && (ia->ia_next != oia)) 733 ia = ia->ia_next; 734 if (ia->ia_next) 735 ia->ia_next = oia->ia_next; 736 else { 737 nd6log((LOG_ERR, 738 "%s: didn't unlink in6ifaddr from list\n", 739 if_name(ifp))); 740 } 741 } 742 743 IFAFREE(&oia->ia_ifa); 744 } 745 746 /* cleanup multicast address kludge table, if there is any */ 747 in6_purgemkludge(ifp); 748 749 /* 750 * remove neighbor management table. we call it twice just to make 751 * sure we nuke everything. maybe we need just one call. 752 * XXX: since the first call did not release addresses, some prefixes 753 * might remain. We should call nd6_purge() again to release the 754 * prefixes after removing all addresses above. 755 * (Or can we just delay calling nd6_purge until at this point?) 756 */ 757 nd6_purge(ifp); 758 759 /* remove route to link-local allnodes multicast (ff02::1) */ 760 bzero(&sin6, sizeof(sin6)); 761 sin6.sin6_len = sizeof(struct sockaddr_in6); 762 sin6.sin6_family = AF_INET6; 763 sin6.sin6_addr = in6addr_linklocal_allnodes; 764 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 765 rt = rtalloc1((struct sockaddr *)&sin6, 0); 766 if (rt && rt->rt_ifp == ifp) { 767 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 768 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 769 rtfree(rt); 770 } 771 }
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