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sys/netinet6/in6_ifattach.c
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1 /* $NetBSD: in6_ifattach.c,v 1.60 2004/02/11 20:51:24 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 1.60 2004/02/11 20:51:24 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/ip6_var.h> 55 #include <netinet6/in6_ifattach.h> 56 #include <netinet6/ip6_var.h> 57 #include <netinet6/nd6.h> 58 #include <netinet6/ip6_mroute.h> 59 60 #include <net/net_osdep.h> 61 62 unsigned long in6_maxmtu = 0; 63 64 int ip6_auto_linklocal = 1; /* enable by default */ 65 66 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 67 static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); 68 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 69 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 70 static int in6_ifattach_loopback __P((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 (/*CONSTCOND*/ 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 static int 91 get_rand_ifid(ifp, in6) 92 struct ifnet *ifp; 93 struct in6_addr *in6; /* upper 64bits are preserved */ 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, (u_char *)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 * Get interface identifier for the specified interface. 125 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 126 */ 127 static int 128 get_hw_ifid(ifp, in6) 129 struct ifnet *ifp; 130 struct in6_addr *in6; /* upper 64bits are preserved */ 131 { 132 struct ifaddr *ifa; 133 struct sockaddr_dl *sdl; 134 char *addr; 135 size_t addrlen; 136 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 137 static u_int8_t allone[8] = 138 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 139 140 for (ifa = ifp->if_addrlist.tqh_first; 141 ifa; 142 ifa = ifa->ifa_list.tqe_next) 143 { 144 if (ifa->ifa_addr->sa_family != AF_LINK) 145 continue; 146 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 147 if (sdl == NULL) 148 continue; 149 if (sdl->sdl_alen == 0) 150 continue; 151 152 goto found; 153 } 154 155 return -1; 156 157 found: 158 addr = LLADDR(sdl); 159 addrlen = sdl->sdl_alen; 160 161 switch (ifp->if_type) { 162 case IFT_IEEE1394: 163 case IFT_IEEE80211: 164 /* IEEE1394 uses 16byte length address starting with EUI64 */ 165 if (addrlen > 8) 166 addrlen = 8; 167 break; 168 default: 169 break; 170 } 171 172 /* get EUI64 */ 173 switch (ifp->if_type) { 174 /* IEEE802/EUI64 cases - what others? */ 175 case IFT_ETHER: 176 case IFT_FDDI: 177 case IFT_ATM: 178 case IFT_IEEE1394: 179 case IFT_IEEE80211: 180 /* look at IEEE802/EUI64 only */ 181 if (addrlen != 8 && addrlen != 6) 182 return -1; 183 184 /* 185 * check for invalid MAC address - on bsdi, we see it a lot 186 * since wildboar configures all-zero MAC on pccard before 187 * card insertion. 188 */ 189 if (bcmp(addr, allzero, addrlen) == 0) 190 return -1; 191 if (bcmp(addr, allone, addrlen) == 0) 192 return -1; 193 194 /* make EUI64 address */ 195 if (addrlen == 8) 196 bcopy(addr, &in6->s6_addr[8], 8); 197 else if (addrlen == 6) { 198 in6->s6_addr[8] = addr[0]; 199 in6->s6_addr[9] = addr[1]; 200 in6->s6_addr[10] = addr[2]; 201 in6->s6_addr[11] = 0xff; 202 in6->s6_addr[12] = 0xfe; 203 in6->s6_addr[13] = addr[3]; 204 in6->s6_addr[14] = addr[4]; 205 in6->s6_addr[15] = addr[5]; 206 } 207 break; 208 209 case IFT_ARCNET: 210 if (addrlen != 1) 211 return -1; 212 if (!addr[0]) 213 return -1; 214 215 bzero(&in6->s6_addr[8], 8); 216 in6->s6_addr[15] = addr[0]; 217 218 /* 219 * due to insufficient bitwidth, we mark it local. 220 */ 221 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 222 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 223 break; 224 225 case IFT_GIF: 226 #ifdef IFT_STF 227 case IFT_STF: 228 #endif 229 /* 230 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 231 * however, IPv4 address is not very suitable as unique 232 * identifier source (can be renumbered). 233 * we don't do this. 234 */ 235 return -1; 236 237 default: 238 return -1; 239 } 240 241 /* sanity check: g bit must not indicate "group" */ 242 if (EUI64_GROUP(in6)) 243 return -1; 244 245 /* convert EUI64 into IPv6 interface identifier */ 246 EUI64_TO_IFID(in6); 247 248 /* 249 * sanity check: ifid must not be all zero, avoid conflict with 250 * subnet router anycast 251 */ 252 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 253 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 254 return -1; 255 } 256 257 return 0; 258 } 259 260 /* 261 * Get interface identifier for the specified interface. If it is not 262 * available on ifp0, borrow interface identifier from other information 263 * sources. 264 */ 265 static int 266 get_ifid(ifp0, altifp, in6) 267 struct ifnet *ifp0; 268 struct ifnet *altifp; /*secondary EUI64 source*/ 269 struct in6_addr *in6; 270 { 271 struct ifnet *ifp; 272 273 /* first, try to get it from the interface itself */ 274 if (get_hw_ifid(ifp0, in6) == 0) { 275 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 276 if_name(ifp0))); 277 goto success; 278 } 279 280 /* try secondary EUI64 source. this basically is for ATM PVC */ 281 if (altifp && get_hw_ifid(altifp, in6) == 0) { 282 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 283 if_name(ifp0), if_name(altifp))); 284 goto success; 285 } 286 287 /* next, try to get it from some other hardware interface */ 288 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 289 { 290 if (ifp == ifp0) 291 continue; 292 if (get_hw_ifid(ifp, in6) != 0) 293 continue; 294 295 /* 296 * to borrow ifid from other interface, ifid needs to be 297 * globally unique 298 */ 299 if (IFID_UNIVERSAL(in6)) { 300 nd6log((LOG_DEBUG, 301 "%s: borrow interface identifier from %s\n", 302 if_name(ifp0), if_name(ifp))); 303 goto success; 304 } 305 } 306 307 /* last resort: get from random number source */ 308 if (get_rand_ifid(ifp, in6) == 0) { 309 nd6log((LOG_DEBUG, 310 "%s: interface identifier generated by random number\n", 311 if_name(ifp0))); 312 goto success; 313 } 314 315 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 316 return -1; 317 318 success: 319 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 320 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 321 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 322 in6->s6_addr[14], in6->s6_addr[15])); 323 return 0; 324 } 325 326 static int 327 in6_ifattach_linklocal(ifp, altifp) 328 struct ifnet *ifp; 329 struct ifnet *altifp; /*secondary EUI64 source*/ 330 { 331 struct in6_ifaddr *ia; 332 struct in6_aliasreq ifra; 333 struct nd_prefix pr0; 334 int i, error; 335 336 /* 337 * configure link-local address. 338 */ 339 bzero(&ifra, sizeof(ifra)); 340 341 /* 342 * in6_update_ifa() does not use ifra_name, but we accurately set it 343 * for safety. 344 */ 345 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 346 347 ifra.ifra_addr.sin6_family = AF_INET6; 348 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 349 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 350 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 351 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 352 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 353 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 354 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 355 } else { 356 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 357 nd6log((LOG_ERR, 358 "%s: no ifid available\n", if_name(ifp))); 359 return (-1); 360 } 361 } 362 363 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 364 ifra.ifra_prefixmask.sin6_family = AF_INET6; 365 ifra.ifra_prefixmask.sin6_addr = in6mask64; 366 #ifdef SCOPEDROUTING 367 /* take into account the sin6_scope_id field for routing */ 368 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 369 #endif 370 /* link-local addresses should NEVER expire. */ 371 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 372 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 373 374 /* 375 * Do not let in6_update_ifa() do DAD, since we need a random delay 376 * before sending an NS at the first time the interface becomes up. 377 * Instead, in6_if_up() will start DAD with a proper random delay. 378 */ 379 ifra.ifra_flags |= IN6_IFF_NODAD; 380 381 /* 382 * Now call in6_update_ifa() to do a bunch of procedures to configure 383 * a link-local address. We can set NULL to the 3rd argument, because 384 * we know there's no other link-local address on the interface 385 * and therefore we are adding one (instead of updating one). 386 */ 387 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 388 /* 389 * XXX: When the interface does not support IPv6, this call 390 * would fail in the SIOCSIFADDR ioctl. I believe the 391 * notification is rather confusing in this case, so just 392 * suppress it. (jinmei@kame.net 20010130) 393 */ 394 if (error != EAFNOSUPPORT) 395 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 396 "configure a link-local address on %s " 397 "(errno=%d)\n", 398 if_name(ifp), error)); 399 return (-1); 400 } 401 402 /* 403 * Adjust ia6_flags so that in6_if_up will perform DAD. 404 * XXX: Some P2P interfaces seem not to send packets just after 405 * becoming up, so we skip p2p interfaces for safety. 406 */ 407 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 408 #ifdef DIAGNOSTIC 409 if (!ia) { 410 panic("ia == NULL in in6_ifattach_linklocal"); 411 /* NOTREACHED */ 412 } 413 #endif 414 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 415 ia->ia6_flags &= ~IN6_IFF_NODAD; 416 ia->ia6_flags |= IN6_IFF_TENTATIVE; 417 } 418 419 /* 420 * Make the link-local prefix (fe80::/64%link) as on-link. 421 * Since we'd like to manage prefixes separately from addresses, 422 * we make an ND6 prefix structure for the link-local prefix, 423 * and add it to the prefix list as a never-expire prefix. 424 * XXX: this change might affect some existing code base... 425 */ 426 bzero(&pr0, sizeof(pr0)); 427 pr0.ndpr_ifp = ifp; 428 /* this should be 64 at this moment. */ 429 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 430 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 431 pr0.ndpr_prefix = ifra.ifra_addr; 432 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 433 for (i = 0; i < 4; i++) { 434 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 435 in6mask64.s6_addr32[i]; 436 } 437 /* 438 * Initialize parameters. The link-local prefix must always be 439 * on-link, and its lifetimes never expire. 440 */ 441 pr0.ndpr_raf_onlink = 1; 442 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 443 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 444 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 445 /* 446 * Since there is no other link-local addresses, nd6_prefix_lookup() 447 * probably returns NULL. However, we cannot always expect the result. 448 * For example, if we first remove the (only) existing link-local 449 * address, and then reconfigure another one, the prefix is still 450 * valid with referring to the old link-local address. 451 */ 452 if (nd6_prefix_lookup(&pr0) == NULL) { 453 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 454 return (error); 455 } 456 457 return 0; 458 } 459 460 static int 461 in6_ifattach_loopback(ifp) 462 struct ifnet *ifp; /* must be IFT_LOOP */ 463 { 464 struct in6_aliasreq ifra; 465 int error; 466 467 bzero(&ifra, sizeof(ifra)); 468 469 /* 470 * in6_update_ifa() does not use ifra_name, but we accurately set it 471 * for safety. 472 */ 473 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 474 475 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 476 ifra.ifra_prefixmask.sin6_family = AF_INET6; 477 ifra.ifra_prefixmask.sin6_addr = in6mask128; 478 479 /* 480 * Always initialize ia_dstaddr (= broadcast address) to loopback 481 * address. Follows IPv4 practice - see in_ifinit(). 482 */ 483 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 484 ifra.ifra_dstaddr.sin6_family = AF_INET6; 485 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 486 487 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 488 ifra.ifra_addr.sin6_family = AF_INET6; 489 ifra.ifra_addr.sin6_addr = in6addr_loopback; 490 491 /* the loopback address should NEVER expire. */ 492 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 493 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 494 495 /* we don't need to perform DAD on loopback interfaces. */ 496 ifra.ifra_flags |= IN6_IFF_NODAD; 497 498 /* 499 * We are sure that this is a newly assigned address, so we can set 500 * NULL to the 3rd arg. 501 */ 502 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 503 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 504 "the loopback address on %s (errno=%d)\n", 505 if_name(ifp), error)); 506 return (-1); 507 } 508 509 return 0; 510 } 511 512 /* 513 * compute NI group address, based on the current hostname setting. 514 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 515 * 516 * when ifp == NULL, the caller is responsible for filling scopeid. 517 */ 518 int 519 in6_nigroup(ifp, name, namelen, sa6) 520 struct ifnet *ifp; 521 const char *name; 522 int namelen; 523 struct sockaddr_in6 *sa6; 524 { 525 const char *p; 526 u_int8_t *q; 527 MD5_CTX ctxt; 528 u_int8_t digest[16]; 529 u_int8_t l; 530 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 531 532 if (!namelen || !name) 533 return -1; 534 535 p = name; 536 while (p && *p && *p != '.' && p - name < namelen) 537 p++; 538 if (p - name > sizeof(n) - 1) 539 return -1; /* label too long */ 540 l = p - name; 541 strncpy((char *)n, name, l); 542 n[(int)l] = '\0'; 543 for (q = n; *q; q++) { 544 if ('A' <= *q && *q <= 'Z') 545 *q = *q - 'A' + 'a'; 546 } 547 548 /* generate 8 bytes of pseudo-random value. */ 549 bzero(&ctxt, sizeof(ctxt)); 550 MD5Init(&ctxt); 551 MD5Update(&ctxt, &l, sizeof(l)); 552 MD5Update(&ctxt, n, l); 553 MD5Final(digest, &ctxt); 554 555 bzero(sa6, sizeof(*sa6)); 556 sa6->sin6_family = AF_INET6; 557 sa6->sin6_len = sizeof(*sa6); 558 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 559 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 560 sa6->sin6_addr.s6_addr8[11] = 2; 561 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 562 sizeof(sa6->sin6_addr.s6_addr32[3])); 563 564 return 0; 565 } 566 567 /* 568 * XXX multiple loopback interface needs more care. for instance, 569 * nodelocal address needs to be configured onto only one of them. 570 * XXX multiple link-local address case 571 */ 572 void 573 in6_ifattach(ifp, altifp) 574 struct ifnet *ifp; 575 struct ifnet *altifp; /* secondary EUI64 source */ 576 { 577 struct in6_ifaddr *ia; 578 struct in6_addr in6; 579 580 /* some of the interfaces are inherently not IPv6 capable */ 581 switch (ifp->if_type) { 582 case IFT_BRIDGE: 583 #ifdef IFT_PFLOG 584 case IFT_PFLOG: 585 #endif 586 #ifdef IFT_PFSYNC 587 case IFT_PFSYNC: 588 #endif 589 return; 590 } 591 592 /* 593 * if link mtu is too small, don't try to configure IPv6. 594 * remember there could be some link-layer that has special 595 * fragmentation logic. 596 */ 597 if (ifp->if_mtu < IPV6_MMTU) { 598 nd6log((LOG_INFO, "in6_ifattach: " 599 "%s has too small MTU, IPv6 not enabled\n", 600 if_name(ifp))); 601 return; 602 } 603 604 /* create a multicast kludge storage (if we have not had one) */ 605 in6_createmkludge(ifp); 606 607 /* 608 * quirks based on interface type 609 */ 610 switch (ifp->if_type) { 611 #ifdef IFT_STF 612 case IFT_STF: 613 /* 614 * 6to4 interface is a very special kind of beast. 615 * no multicast, no linklocal. RFC2529 specifies how to make 616 * linklocals for 6to4 interface, but there's no use and 617 * it is rather harmful to have one. 618 */ 619 return; 620 #endif 621 default: 622 break; 623 } 624 625 /* 626 * usually, we require multicast capability to the interface 627 */ 628 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 629 nd6log((LOG_INFO, "in6_ifattach: " 630 "%s is not multicast capable, IPv6 not enabled\n", 631 if_name(ifp))); 632 return; 633 } 634 635 /* 636 * assign loopback address for loopback interface. 637 * XXX multiple loopback interface case. 638 */ 639 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 640 in6 = in6addr_loopback; 641 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 642 if (in6_ifattach_loopback(ifp) != 0) 643 return; 644 } 645 } 646 647 /* 648 * assign a link-local address, if there's none. 649 */ 650 if (ip6_auto_linklocal) { 651 ia = in6ifa_ifpforlinklocal(ifp, 0); 652 if (ia == NULL) { 653 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 654 /* linklocal address assigned */ 655 } else { 656 /* failed to assign linklocal address. bark? */ 657 } 658 } 659 } 660 } 661 662 /* 663 * NOTE: in6_ifdetach() does not support loopback if at this moment. 664 * We don't need this function in bsdi, because interfaces are never removed 665 * from the ifnet list in bsdi. 666 */ 667 void 668 in6_ifdetach(ifp) 669 struct ifnet *ifp; 670 { 671 struct in6_ifaddr *ia, *oia; 672 struct ifaddr *ifa, *next; 673 struct rtentry *rt; 674 short rtflags; 675 struct sockaddr_in6 sin6; 676 struct in6_multi_mship *imm; 677 678 /* remove ip6_mrouter stuff */ 679 ip6_mrouter_detach(ifp); 680 681 /* remove neighbor management table */ 682 nd6_purge(ifp); 683 684 /* nuke any of IPv6 addresses we have */ 685 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 686 { 687 next = ifa->ifa_list.tqe_next; 688 if (ifa->ifa_addr->sa_family != AF_INET6) 689 continue; 690 in6_purgeaddr(ifa); 691 } 692 693 /* undo everything done by in6_ifattach(), just in case */ 694 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 695 { 696 next = ifa->ifa_list.tqe_next; 697 698 if (ifa->ifa_addr->sa_family != AF_INET6 699 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 700 continue; 701 } 702 703 ia = (struct in6_ifaddr *)ifa; 704 705 /* 706 * leave from multicast groups we have joined for the interface 707 */ 708 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 709 LIST_REMOVE(imm, i6mm_chain); 710 in6_leavegroup(imm); 711 } 712 713 /* remove from the routing table */ 714 if ((ia->ia_flags & IFA_ROUTE) && 715 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 716 rtflags = rt->rt_flags; 717 rtfree(rt); 718 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 719 (struct sockaddr *)&ia->ia_addr, 720 (struct sockaddr *)&ia->ia_prefixmask, 721 rtflags, (struct rtentry **)0); 722 } 723 724 /* remove from the linked list */ 725 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 726 IFAFREE(&ia->ia_ifa); 727 728 /* also remove from the IPv6 address chain(itojun&jinmei) */ 729 oia = ia; 730 if (oia == (ia = in6_ifaddr)) 731 in6_ifaddr = ia->ia_next; 732 else { 733 while (ia->ia_next && (ia->ia_next != oia)) 734 ia = ia->ia_next; 735 if (ia->ia_next) 736 ia->ia_next = oia->ia_next; 737 else { 738 nd6log((LOG_ERR, 739 "%s: didn't unlink in6ifaddr from list\n", 740 if_name(ifp))); 741 } 742 } 743 744 IFAFREE(&oia->ia_ifa); 745 } 746 747 /* cleanup multicast address kludge table, if there is any */ 748 in6_purgemkludge(ifp); 749 750 /* 751 * remove neighbor management table. we call it twice just to make 752 * sure we nuke everything. maybe we need just one call. 753 * XXX: since the first call did not release addresses, some prefixes 754 * might remain. We should call nd6_purge() again to release the 755 * prefixes after removing all addresses above. 756 * (Or can we just delay calling nd6_purge until at this point?) 757 */ 758 nd6_purge(ifp); 759 760 /* remove route to link-local allnodes multicast (ff02::1) */ 761 bzero(&sin6, sizeof(sin6)); 762 sin6.sin6_len = sizeof(struct sockaddr_in6); 763 sin6.sin6_family = AF_INET6; 764 sin6.sin6_addr = in6addr_linklocal_allnodes; 765 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 766 rt = rtalloc1((struct sockaddr *)&sin6, 0); 767 if (rt && rt->rt_ifp == ifp) { 768 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 769 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 770 rtfree(rt); 771 } 772 }
Cache object: c054cc157f5437eb2b82a40ba5745593
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