in6_ifattach.c revision 1.43
1/* $OpenBSD: in6_ifattach.c,v 1.43 2006/08/31 12:37:31 mcbride Exp $ */ 2/* $KAME: in6_ifattach.c,v 1.124 2001/07/18 08:32:51 jinmei Exp $ */ 3 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#include <sys/param.h> 34#include <sys/systm.h> 35#include <sys/malloc.h> 36#include <sys/socket.h> 37#include <sys/sockio.h> 38#include <sys/kernel.h> 39#include <sys/syslog.h> 40 41#include <crypto/md5.h> 42 43#include <net/if.h> 44#include <net/if_dl.h> 45#include <net/if_types.h> 46#include <net/route.h> 47 48#include <netinet/in.h> 49#include <netinet/in_var.h> 50#include <netinet/if_ether.h> 51 52#include <netinet/ip6.h> 53#include <netinet6/ip6_var.h> 54#include <netinet6/in6_ifattach.h> 55#include <netinet6/ip6_var.h> 56#include <netinet6/nd6.h> 57#ifdef MROUTING 58#include <netinet6/ip6_mroute.h> 59#endif 60 61unsigned long in6_maxmtu = 0; 62 63int ip6_auto_linklocal = 1; /* enable by default */ 64 65static int get_rand_ifid(struct ifnet *, struct in6_addr *); 66static int get_hw_ifid(struct ifnet *, struct in6_addr *); 67static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 68static int in6_ifattach_loopback(struct ifnet *); 69 70#define EUI64_GBIT 0x01 71#define EUI64_UBIT 0x02 72#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 73#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 74#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 75#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 76#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 77 78#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 79#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 80 81/* 82 * Generate a last-resort interface identifier, when the machine has no 83 * IEEE802/EUI64 address sources. 84 * The goal here is to get an interface identifier that is 85 * (1) random enough and (2) does not change across reboot. 86 * We currently use MD5(hostname) for it. 87 */ 88static int 89get_rand_ifid(ifp, in6) 90 struct ifnet *ifp; 91 struct in6_addr *in6; /* upper 64bits are preserved */ 92{ 93 MD5_CTX ctxt; 94 u_int8_t digest[16]; 95 96#if 0 97 /* we need at least several letters as seed for ifid */ 98 if (hostnamelen < 3) 99 return -1; 100#endif 101 102 /* generate 8 bytes of pseudo-random value. */ 103 bzero(&ctxt, sizeof(ctxt)); 104 MD5Init(&ctxt); 105 MD5Update(&ctxt, hostname, hostnamelen); 106 MD5Final(digest, &ctxt); 107 108 /* assumes sizeof(digest) > sizeof(ifid) */ 109 bcopy(digest, &in6->s6_addr[8], 8); 110 111 /* make sure to set "u" bit to local, and "g" bit to individual. */ 112 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 113 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 114 115 /* convert EUI64 into IPv6 interface identifier */ 116 EUI64_TO_IFID(in6); 117 118 return 0; 119} 120 121/* 122 * Get interface identifier for the specified interface. 123 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 124 */ 125static int 126get_hw_ifid(ifp, in6) 127 struct ifnet *ifp; 128 struct in6_addr *in6; /* upper 64bits are preserved */ 129{ 130 struct ifaddr *ifa; 131 struct sockaddr_dl *sdl; 132 char *addr; 133 size_t addrlen; 134 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 135 static u_int8_t allone[8] = 136 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 137 138 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 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_CARP: 172 case IFT_FDDI: 173 case IFT_ATM: 174 case IFT_IEEE1394: 175 case IFT_IEEE80211: 176 /* look at IEEE802/EUI64 only */ 177 if (addrlen != 8 && addrlen != 6) 178 return -1; 179 180 /* 181 * check for invalid MAC address - on bsdi, we see it a lot 182 * since wildboar configures all-zero MAC on pccard before 183 * card insertion. 184 */ 185 if (bcmp(addr, allzero, addrlen) == 0) 186 return -1; 187 if (bcmp(addr, allone, addrlen) == 0) 188 return -1; 189 190 /* make EUI64 address */ 191 if (addrlen == 8) 192 bcopy(addr, &in6->s6_addr[8], 8); 193 else if (addrlen == 6) { 194 in6->s6_addr[8] = addr[0]; 195 in6->s6_addr[9] = addr[1]; 196 in6->s6_addr[10] = addr[2]; 197 in6->s6_addr[11] = 0xff; 198 in6->s6_addr[12] = 0xfe; 199 in6->s6_addr[13] = addr[3]; 200 in6->s6_addr[14] = addr[4]; 201 in6->s6_addr[15] = addr[5]; 202 } 203 break; 204 205 case IFT_ARCNET: 206 if (addrlen != 1) 207 return -1; 208 if (!addr[0]) 209 return -1; 210 211 bzero(&in6->s6_addr[8], 8); 212 in6->s6_addr[15] = addr[0]; 213 214 /* 215 * due to insufficient bitwidth, we mark it local. 216 */ 217 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 218 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 219 break; 220 221 case IFT_GIF: 222 /* 223 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 224 * however, IPv4 address is not very suitable as unique 225 * identifier source (can be renumbered). 226 * we don't do this. 227 */ 228 return -1; 229 230 default: 231 return -1; 232 } 233 234 /* sanity check: g bit must not indicate "group" */ 235 if (EUI64_GROUP(in6)) 236 return -1; 237 238 /* convert EUI64 into IPv6 interface identifier */ 239 EUI64_TO_IFID(in6); 240 241 /* 242 * sanity check: ifid must not be all zero, avoid conflict with 243 * subnet router anycast 244 */ 245 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 246 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 247 return -1; 248 } 249 250 return 0; 251} 252 253/* 254 * Get interface identifier for the specified interface. If it is not 255 * available on ifp0, borrow interface identifier from other information 256 * sources. 257 */ 258static int 259get_ifid(ifp0, altifp, in6) 260 struct ifnet *ifp0; 261 struct ifnet *altifp; /* secondary EUI64 source */ 262 struct in6_addr *in6; 263{ 264 struct ifnet *ifp; 265 266 /* first, try to get it from the interface itself */ 267 if (get_hw_ifid(ifp0, in6) == 0) { 268 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 269 ifp0->if_xname)); 270 goto success; 271 } 272 273 /* try secondary EUI64 source. this basically is for ATM PVC */ 274 if (altifp && get_hw_ifid(altifp, in6) == 0) { 275 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 276 ifp0->if_xname, altifp->if_xname)); 277 goto success; 278 } 279 280 /* next, try to get it from some other hardware interface */ 281 TAILQ_FOREACH(ifp, &ifnet, if_list) { 282 if (ifp == ifp0) 283 continue; 284 if (get_hw_ifid(ifp, in6) != 0) 285 continue; 286 287 /* 288 * to borrow ifid from other interface, ifid needs to be 289 * globally unique 290 */ 291 if (IFID_UNIVERSAL(in6)) { 292 nd6log((LOG_DEBUG, 293 "%s: borrow interface identifier from %s\n", 294 ifp0->if_xname, ifp->if_xname)); 295 goto success; 296 } 297 } 298 299 /* last resort: get from random number source */ 300 if (get_rand_ifid(ifp, in6) == 0) { 301 nd6log((LOG_DEBUG, 302 "%s: interface identifier generated by random number\n", 303 ifp0->if_xname)); 304 goto success; 305 } 306 307 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 308 return -1; 309 310success: 311 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 312 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 313 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 314 in6->s6_addr[14], in6->s6_addr[15])); 315 return 0; 316} 317 318int 319in6_ifattach_linklocal(ifp, altifp) 320 struct ifnet *ifp; 321 struct ifnet *altifp; /*secondary EUI64 source*/ 322{ 323 struct in6_ifaddr *ia; 324 struct in6_aliasreq ifra; 325 struct nd_prefix pr0; 326 int i, error; 327 328 /* 329 * configure link-local address. 330 */ 331 bzero(&ifra, sizeof(ifra)); 332 333 /* 334 * in6_update_ifa() does not use ifra_name, but we accurately set it 335 * for safety. 336 */ 337 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 338 339 ifra.ifra_addr.sin6_family = AF_INET6; 340 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 341 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 342 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 343 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 344 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 345 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 346 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 347 } else { 348 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 349 nd6log((LOG_ERR, 350 "%s: no ifid available\n", ifp->if_xname)); 351 return (-1); 352 } 353 } 354 355 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 356 ifra.ifra_prefixmask.sin6_family = AF_INET6; 357 ifra.ifra_prefixmask.sin6_addr = in6mask64; 358#ifdef SCOPEDROUTING 359 /* take into account the sin6_scope_id field for routing */ 360 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 361#endif 362 /* link-local addresses should NEVER expire. */ 363 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 364 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 365 366 /* 367 * Do not let in6_update_ifa() do DAD, since we need a random delay 368 * before sending an NS at the first time the interface becomes up. 369 * Instead, in6_if_up() will start DAD with a proper random delay. 370 */ 371 ifra.ifra_flags |= IN6_IFF_NODAD; 372 373 /* 374 * Now call in6_update_ifa() to do a bunch of procedures to configure 375 * a link-local address. In the case of CARP, we may be called after 376 * one has already been configured, so check if it's already there 377 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 378 */ 379 if ((error = in6_update_ifa(ifp, &ifra, 380 in6ifa_ifpforlinklocal(ifp, 0))) != 0) { 381 /* 382 * XXX: When the interface does not support IPv6, this call 383 * would fail in the SIOCSIFADDR ioctl. I believe the 384 * notification is rather confusing in this case, so just 385 * suppress it. (jinmei@kame.net 20010130) 386 */ 387 if (error != EAFNOSUPPORT) 388 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 389 "configure a link-local address on %s " 390 "(errno=%d)\n", 391 ifp->if_xname, error)); 392 return (-1); 393 } 394 395 /* 396 * Adjust ia6_flags so that in6_if_up will perform DAD. 397 * XXX: Some P2P interfaces seem not to send packets just after 398 * becoming up, so we skip p2p interfaces for safety. 399 */ 400 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 401#ifdef DIAGNOSTIC 402 if (!ia) { 403 panic("ia == NULL in in6_ifattach_linklocal"); 404 /* NOTREACHED */ 405 } 406#endif 407 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 408 (ifp->if_type == IFT_CARP)) == 0) { 409 ia->ia6_flags &= ~IN6_IFF_NODAD; 410 ia->ia6_flags |= IN6_IFF_TENTATIVE; 411 } 412 413 /* 414 * Make the link-local prefix (fe80::/64%link) as on-link. 415 * Since we'd like to manage prefixes separately from addresses, 416 * we make an ND6 prefix structure for the link-local prefix, 417 * and add it to the prefix list as a never-expire prefix. 418 * XXX: this change might affect some existing code base... 419 */ 420 bzero(&pr0, sizeof(pr0)); 421 pr0.ndpr_ifp = ifp; 422 /* this should be 64 at this moment. */ 423 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 424 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 425 pr0.ndpr_prefix = ifra.ifra_addr; 426 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 427 for (i = 0; i < 4; i++) { 428 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 429 in6mask64.s6_addr32[i]; 430 } 431 /* 432 * Initialize parameters. The link-local prefix must always be 433 * on-link, and its lifetimes never expire. 434 */ 435 pr0.ndpr_raf_onlink = 1; 436 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 437 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 438 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 439 /* 440 * Since there is no other link-local addresses, nd6_prefix_lookup() 441 * probably returns NULL. However, we cannot always expect the result. 442 * For example, if we first remove the (only) existing link-local 443 * address, and then reconfigure another one, the prefix is still 444 * valid with referring to the old link-local address. 445 */ 446 if (nd6_prefix_lookup(&pr0) == NULL) { 447 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 448 return (error); 449 } 450 451 return 0; 452} 453 454static int 455in6_ifattach_loopback(ifp) 456 struct ifnet *ifp; /* must be IFT_LOOP */ 457{ 458 struct in6_aliasreq ifra; 459 int error; 460 461 bzero(&ifra, sizeof(ifra)); 462 463 /* 464 * in6_update_ifa() does not use ifra_name, but we accurately set it 465 * for safety. 466 */ 467 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 468 469 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 470 ifra.ifra_prefixmask.sin6_family = AF_INET6; 471 ifra.ifra_prefixmask.sin6_addr = in6mask128; 472 473 /* 474 * Always initialize ia_dstaddr (= broadcast address) to loopback 475 * address. Follows IPv4 practice - see in_ifinit(). 476 */ 477 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 478 ifra.ifra_dstaddr.sin6_family = AF_INET6; 479 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 480 481 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 482 ifra.ifra_addr.sin6_family = AF_INET6; 483 ifra.ifra_addr.sin6_addr = in6addr_loopback; 484 485 /* the loopback address should NEVER expire. */ 486 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 487 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 488 489 /* we don't need to perform DAD on loopback interfaces. */ 490 ifra.ifra_flags |= IN6_IFF_NODAD; 491 492 /* 493 * We are sure that this is a newly assigned address, so we can set 494 * NULL to the 3rd arg. 495 */ 496 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 497 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 498 "the loopback address on %s (errno=%d)\n", 499 ifp->if_xname, error)); 500 return (-1); 501 } 502 503 return 0; 504} 505 506/* 507 * compute NI group address, based on the current hostname setting. 508 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 509 * 510 * when ifp == NULL, the caller is responsible for filling scopeid. 511 */ 512int 513in6_nigroup(ifp, name, namelen, sa6) 514 struct ifnet *ifp; 515 const char *name; 516 int namelen; 517 struct sockaddr_in6 *sa6; 518{ 519 const char *p; 520 u_int8_t *q; 521 MD5_CTX ctxt; 522 u_int8_t digest[16]; 523 u_int8_t l; 524 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 525 526 if (!namelen || !name) 527 return -1; 528 529 p = name; 530 while (p && *p && *p != '.' && p - name < namelen) 531 p++; 532 if (p - name > sizeof(n) - 1) 533 return -1; /* label too long */ 534 l = p - name; 535 strncpy((char *)n, name, l); 536 n[(int)l] = '\0'; 537 for (q = n; *q; q++) { 538 if ('A' <= *q && *q <= 'Z') 539 *q = *q - 'A' + 'a'; 540 } 541 542 /* generate 8 bytes of pseudo-random value. */ 543 bzero(&ctxt, sizeof(ctxt)); 544 MD5Init(&ctxt); 545 MD5Update(&ctxt, &l, sizeof(l)); 546 MD5Update(&ctxt, n, l); 547 MD5Final(digest, &ctxt); 548 549 bzero(sa6, sizeof(*sa6)); 550 sa6->sin6_family = AF_INET6; 551 sa6->sin6_len = sizeof(*sa6); 552 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 553 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 554 sa6->sin6_addr.s6_addr8[11] = 2; 555 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 556 sizeof(sa6->sin6_addr.s6_addr32[3])); 557 558 return 0; 559} 560 561/* 562 * XXX multiple loopback interface needs more care. for instance, 563 * nodelocal address needs to be configured onto only one of them. 564 * XXX multiple link-local address case 565 */ 566void 567in6_ifattach(ifp, altifp) 568 struct ifnet *ifp; 569 struct ifnet *altifp; /* secondary EUI64 source */ 570{ 571 struct in6_ifaddr *ia; 572 struct in6_addr in6; 573 574 /* some of the interfaces are inherently not IPv6 capable */ 575 switch (ifp->if_type) { 576 case IFT_BRIDGE: 577 case IFT_ENC: 578 case IFT_PFLOG: 579 case IFT_PFSYNC: 580 return; 581 } 582 583 /* 584 * if link mtu is too small, don't try to configure IPv6. 585 * remember there could be some link-layer that has special 586 * fragmentation logic. 587 */ 588 if (ifp->if_mtu < IPV6_MMTU) { 589 nd6log((LOG_INFO, "in6_ifattach: " 590 "%s has too small MTU, IPv6 not enabled\n", 591 ifp->if_xname)); 592 return; 593 } 594 595 /* create a multicast kludge storage (if we have not had one) */ 596 in6_createmkludge(ifp); 597 598 /* 599 * quirks based on interface type 600 */ 601 switch (ifp->if_type) { 602 /* we attach a link-local address when a vhid is assigned */ 603 case IFT_CARP: 604 return; 605 default: 606 break; 607 } 608 609 /* 610 * usually, we require multicast capability to the interface 611 */ 612 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 613 nd6log((LOG_INFO, "in6_ifattach: " 614 "%s is not multicast capable, IPv6 not enabled\n", 615 ifp->if_xname)); 616 return; 617 } 618 619 /* 620 * assign loopback address for loopback interface. 621 * XXX multiple loopback interface case. 622 */ 623 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 624 in6 = in6addr_loopback; 625 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 626 if (in6_ifattach_loopback(ifp) != 0) 627 return; 628 } 629 } 630 631 /* 632 * assign a link-local address, if there's none. 633 */ 634 if (ip6_auto_linklocal) { 635 ia = in6ifa_ifpforlinklocal(ifp, 0); 636 if (ia == NULL) { 637 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 638 /* linklocal address assigned */ 639 } else { 640 /* failed to assign linklocal address. bark? */ 641 } 642 } 643 } 644} 645 646/* 647 * NOTE: in6_ifdetach() does not support loopback if at this moment. 648 */ 649void 650in6_ifdetach(ifp) 651 struct ifnet *ifp; 652{ 653 struct in6_ifaddr *ia, *oia; 654 struct ifaddr *ifa, *next; 655 struct rtentry *rt; 656 short rtflags; 657 struct sockaddr_in6 sin6; 658 struct in6_multi_mship *imm; 659 660#ifdef MROUTING 661 /* remove ip6_mrouter stuff */ 662 ip6_mrouter_detach(ifp); 663#endif 664 665 /* remove neighbor management table */ 666 nd6_purge(ifp); 667 668 /* nuke any of IPv6 addresses we have */ 669 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 670 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 671 next = TAILQ_NEXT(ifa, ifa_list); 672 if (ifa->ifa_addr->sa_family != AF_INET6) 673 continue; 674 in6_purgeaddr(ifa); 675 } 676 677 /* undo everything done by in6_ifattach(), just in case */ 678 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 679 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 680 next = TAILQ_NEXT(ifa, ifa_list); 681 682 if (ifa->ifa_addr->sa_family != AF_INET6 683 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 684 continue; 685 } 686 687 ia = (struct in6_ifaddr *)ifa; 688 689 /* 690 * leave from multicast groups we have joined for the interface 691 */ 692 while (!LIST_EMPTY(&ia->ia6_memberships)) { 693 imm = LIST_FIRST(&ia->ia6_memberships); 694 LIST_REMOVE(imm, i6mm_chain); 695 in6_leavegroup(imm); 696 } 697 698 /* remove from the routing table */ 699 if ((ia->ia_flags & IFA_ROUTE) && 700 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0))) { 701 rtflags = rt->rt_flags; 702 rtfree(rt); 703 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 704 (struct sockaddr *)&ia->ia_addr, 705 (struct sockaddr *)&ia->ia_prefixmask, 706 rtflags, (struct rtentry **)0, 0); 707 } 708 709 /* remove from the linked list */ 710 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 711 IFAFREE(&ia->ia_ifa); 712 713 /* also remove from the IPv6 address chain(itojun&jinmei) */ 714 oia = ia; 715 if (oia == (ia = in6_ifaddr)) 716 in6_ifaddr = ia->ia_next; 717 else { 718 while (ia->ia_next && (ia->ia_next != oia)) 719 ia = ia->ia_next; 720 if (ia->ia_next) 721 ia->ia_next = oia->ia_next; 722 else { 723 nd6log((LOG_ERR, 724 "%s: didn't unlink in6ifaddr from list\n", 725 ifp->if_xname)); 726 } 727 } 728 729 IFAFREE(&oia->ia_ifa); 730 } 731 732 /* cleanup multicast address kludge table, if there is any */ 733 in6_purgemkludge(ifp); 734 735 /* 736 * remove neighbor management table. we call it twice just to make 737 * sure we nuke everything. maybe we need just one call. 738 * XXX: since the first call did not release addresses, some prefixes 739 * might remain. We should call nd6_purge() again to release the 740 * prefixes after removing all addresses above. 741 * (Or can we just delay calling nd6_purge until at this point?) 742 */ 743 nd6_purge(ifp); 744 745 /* remove route to link-local allnodes multicast (ff02::1) */ 746 bzero(&sin6, sizeof(sin6)); 747 sin6.sin6_len = sizeof(struct sockaddr_in6); 748 sin6.sin6_family = AF_INET6; 749 sin6.sin6_addr = in6addr_linklocal_allnodes; 750 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 751 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 752 if (rt && rt->rt_ifp == ifp) { 753 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 754 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0, 0); 755 rtfree(rt); 756 } 757} 758