in6_ifattach.c revision 1.46
1/* $OpenBSD: in6_ifattach.c,v 1.46 2008/05/11 08:13:02 claudio 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_GIF: 206 /* 207 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 208 * however, IPv4 address is not very suitable as unique 209 * identifier source (can be renumbered). 210 * we don't do this. 211 */ 212 return -1; 213 214 default: 215 return -1; 216 } 217 218 /* sanity check: g bit must not indicate "group" */ 219 if (EUI64_GROUP(in6)) 220 return -1; 221 222 /* convert EUI64 into IPv6 interface identifier */ 223 EUI64_TO_IFID(in6); 224 225 /* 226 * sanity check: ifid must not be all zero, avoid conflict with 227 * subnet router anycast 228 */ 229 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 230 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 231 return -1; 232 } 233 234 return 0; 235} 236 237/* 238 * Get interface identifier for the specified interface. If it is not 239 * available on ifp0, borrow interface identifier from other information 240 * sources. 241 */ 242static int 243get_ifid(ifp0, altifp, in6) 244 struct ifnet *ifp0; 245 struct ifnet *altifp; /* secondary EUI64 source */ 246 struct in6_addr *in6; 247{ 248 struct ifnet *ifp; 249 250 /* first, try to get it from the interface itself */ 251 if (get_hw_ifid(ifp0, in6) == 0) { 252 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 253 ifp0->if_xname)); 254 goto success; 255 } 256 257 /* try secondary EUI64 source. this basically is for ATM PVC */ 258 if (altifp && get_hw_ifid(altifp, in6) == 0) { 259 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 260 ifp0->if_xname, altifp->if_xname)); 261 goto success; 262 } 263 264 /* next, try to get it from some other hardware interface */ 265 TAILQ_FOREACH(ifp, &ifnet, if_list) { 266 if (ifp == ifp0) 267 continue; 268 if (get_hw_ifid(ifp, in6) != 0) 269 continue; 270 271 /* 272 * to borrow ifid from other interface, ifid needs to be 273 * globally unique 274 */ 275 if (IFID_UNIVERSAL(in6)) { 276 nd6log((LOG_DEBUG, 277 "%s: borrow interface identifier from %s\n", 278 ifp0->if_xname, ifp->if_xname)); 279 goto success; 280 } 281 } 282 283 /* last resort: get from random number source */ 284 if (get_rand_ifid(ifp, in6) == 0) { 285 nd6log((LOG_DEBUG, 286 "%s: interface identifier generated by random number\n", 287 ifp0->if_xname)); 288 goto success; 289 } 290 291 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 292 return -1; 293 294success: 295 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 296 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 297 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 298 in6->s6_addr[14], in6->s6_addr[15])); 299 return 0; 300} 301 302int 303in6_ifattach_linklocal(ifp, altifp) 304 struct ifnet *ifp; 305 struct ifnet *altifp; /*secondary EUI64 source*/ 306{ 307 struct in6_ifaddr *ia; 308 struct in6_aliasreq ifra; 309 struct nd_prefix pr0; 310 int i, error; 311 312 /* 313 * configure link-local address. 314 */ 315 bzero(&ifra, sizeof(ifra)); 316 317 /* 318 * in6_update_ifa() does not use ifra_name, but we accurately set it 319 * for safety. 320 */ 321 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 322 323 ifra.ifra_addr.sin6_family = AF_INET6; 324 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 325 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 326 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 327 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 328 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 329 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 330 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 331 } else { 332 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 333 nd6log((LOG_ERR, 334 "%s: no ifid available\n", ifp->if_xname)); 335 return (-1); 336 } 337 } 338 339 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 340 ifra.ifra_prefixmask.sin6_family = AF_INET6; 341 ifra.ifra_prefixmask.sin6_addr = in6mask64; 342 /* link-local addresses should NEVER expire. */ 343 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 344 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 345 346 /* 347 * Do not let in6_update_ifa() do DAD, since we need a random delay 348 * before sending an NS at the first time the interface becomes up. 349 * Instead, in6_if_up() will start DAD with a proper random delay. 350 */ 351 ifra.ifra_flags |= IN6_IFF_NODAD; 352 353 /* 354 * Now call in6_update_ifa() to do a bunch of procedures to configure 355 * a link-local address. In the case of CARP, we may be called after 356 * one has already been configured, so check if it's already there 357 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 358 */ 359 if ((error = in6_update_ifa(ifp, &ifra, 360 in6ifa_ifpforlinklocal(ifp, 0))) != 0) { 361 /* 362 * XXX: When the interface does not support IPv6, this call 363 * would fail in the SIOCSIFADDR ioctl. I believe the 364 * notification is rather confusing in this case, so just 365 * suppress it. (jinmei@kame.net 20010130) 366 */ 367 if (error != EAFNOSUPPORT) 368 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 369 "configure a link-local address on %s " 370 "(errno=%d)\n", 371 ifp->if_xname, error)); 372 return (-1); 373 } 374 375 /* 376 * Adjust ia6_flags so that in6_if_up will perform DAD. 377 * XXX: Some P2P interfaces seem not to send packets just after 378 * becoming up, so we skip p2p interfaces for safety. 379 */ 380 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 381#ifdef DIAGNOSTIC 382 if (!ia) { 383 panic("ia == NULL in in6_ifattach_linklocal"); 384 /* NOTREACHED */ 385 } 386#endif 387 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 388 (ifp->if_type == IFT_CARP)) == 0) { 389 ia->ia6_flags &= ~IN6_IFF_NODAD; 390 ia->ia6_flags |= IN6_IFF_TENTATIVE; 391 } 392 393 /* 394 * Make the link-local prefix (fe80::/64%link) as on-link. 395 * Since we'd like to manage prefixes separately from addresses, 396 * we make an ND6 prefix structure for the link-local prefix, 397 * and add it to the prefix list as a never-expire prefix. 398 * XXX: this change might affect some existing code base... 399 */ 400 bzero(&pr0, sizeof(pr0)); 401 pr0.ndpr_ifp = ifp; 402 /* this should be 64 at this moment. */ 403 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 404 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 405 pr0.ndpr_prefix = ifra.ifra_addr; 406 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 407 for (i = 0; i < 4; i++) { 408 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 409 in6mask64.s6_addr32[i]; 410 } 411 /* 412 * Initialize parameters. The link-local prefix must always be 413 * on-link, and its lifetimes never expire. 414 */ 415 pr0.ndpr_raf_onlink = 1; 416 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 417 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 418 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 419 /* 420 * Since there is no other link-local addresses, nd6_prefix_lookup() 421 * probably returns NULL. However, we cannot always expect the result. 422 * For example, if we first remove the (only) existing link-local 423 * address, and then reconfigure another one, the prefix is still 424 * valid with referring to the old link-local address. 425 */ 426 if (nd6_prefix_lookup(&pr0) == NULL) { 427 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 428 return (error); 429 } 430 431 return 0; 432} 433 434static int 435in6_ifattach_loopback(ifp) 436 struct ifnet *ifp; /* must be IFT_LOOP */ 437{ 438 struct in6_aliasreq ifra; 439 int error; 440 441 bzero(&ifra, sizeof(ifra)); 442 443 /* 444 * in6_update_ifa() does not use ifra_name, but we accurately set it 445 * for safety. 446 */ 447 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 448 449 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 450 ifra.ifra_prefixmask.sin6_family = AF_INET6; 451 ifra.ifra_prefixmask.sin6_addr = in6mask128; 452 453 /* 454 * Always initialize ia_dstaddr (= broadcast address) to loopback 455 * address. Follows IPv4 practice - see in_ifinit(). 456 */ 457 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 458 ifra.ifra_dstaddr.sin6_family = AF_INET6; 459 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 460 461 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 462 ifra.ifra_addr.sin6_family = AF_INET6; 463 ifra.ifra_addr.sin6_addr = in6addr_loopback; 464 465 /* the loopback address should NEVER expire. */ 466 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 467 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 468 469 /* we don't need to perform DAD on loopback interfaces. */ 470 ifra.ifra_flags |= IN6_IFF_NODAD; 471 472 /* 473 * We are sure that this is a newly assigned address, so we can set 474 * NULL to the 3rd arg. 475 */ 476 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 477 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 478 "the loopback address on %s (errno=%d)\n", 479 ifp->if_xname, error)); 480 return (-1); 481 } 482 483 return 0; 484} 485 486/* 487 * compute NI group address, based on the current hostname setting. 488 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 489 * 490 * when ifp == NULL, the caller is responsible for filling scopeid. 491 */ 492int 493in6_nigroup(ifp, name, namelen, sa6) 494 struct ifnet *ifp; 495 const char *name; 496 int namelen; 497 struct sockaddr_in6 *sa6; 498{ 499 const char *p; 500 u_int8_t *q; 501 MD5_CTX ctxt; 502 u_int8_t digest[16]; 503 u_int8_t l; 504 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 505 506 if (!namelen || !name) 507 return -1; 508 509 p = name; 510 while (p && *p && *p != '.' && p - name < namelen) 511 p++; 512 if (p - name > sizeof(n) - 1) 513 return -1; /* label too long */ 514 l = p - name; 515 strncpy((char *)n, name, l); 516 n[(int)l] = '\0'; 517 for (q = n; *q; q++) { 518 if ('A' <= *q && *q <= 'Z') 519 *q = *q - 'A' + 'a'; 520 } 521 522 /* generate 8 bytes of pseudo-random value. */ 523 bzero(&ctxt, sizeof(ctxt)); 524 MD5Init(&ctxt); 525 MD5Update(&ctxt, &l, sizeof(l)); 526 MD5Update(&ctxt, n, l); 527 MD5Final(digest, &ctxt); 528 529 bzero(sa6, sizeof(*sa6)); 530 sa6->sin6_family = AF_INET6; 531 sa6->sin6_len = sizeof(*sa6); 532 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 533 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 534 sa6->sin6_addr.s6_addr8[11] = 2; 535 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 536 sizeof(sa6->sin6_addr.s6_addr32[3])); 537 538 return 0; 539} 540 541/* 542 * XXX multiple loopback interface needs more care. for instance, 543 * nodelocal address needs to be configured onto only one of them. 544 * XXX multiple link-local address case 545 */ 546void 547in6_ifattach(ifp, altifp) 548 struct ifnet *ifp; 549 struct ifnet *altifp; /* secondary EUI64 source */ 550{ 551 struct in6_ifaddr *ia; 552 struct in6_addr in6; 553 554 /* some of the interfaces are inherently not IPv6 capable */ 555 switch (ifp->if_type) { 556 case IFT_BRIDGE: 557 case IFT_ENC: 558 case IFT_PFLOG: 559 case IFT_PFSYNC: 560 return; 561 } 562 563 /* 564 * if link mtu is too small, don't try to configure IPv6. 565 * remember there could be some link-layer that has special 566 * fragmentation logic. 567 */ 568 if (ifp->if_mtu < IPV6_MMTU) { 569 nd6log((LOG_INFO, "in6_ifattach: " 570 "%s has too small MTU, IPv6 not enabled\n", 571 ifp->if_xname)); 572 return; 573 } 574 575 /* create a multicast kludge storage (if we have not had one) */ 576 in6_createmkludge(ifp); 577 578 /* 579 * quirks based on interface type 580 */ 581 switch (ifp->if_type) { 582 /* we attach a link-local address when a vhid is assigned */ 583 case IFT_CARP: 584 return; 585 default: 586 break; 587 } 588 589 /* 590 * usually, we require multicast capability to the interface 591 */ 592 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 593 nd6log((LOG_INFO, "in6_ifattach: " 594 "%s is not multicast capable, IPv6 not enabled\n", 595 ifp->if_xname)); 596 return; 597 } 598 599 /* 600 * assign loopback address for loopback interface. 601 * XXX multiple loopback interface case. 602 */ 603 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 604 in6 = in6addr_loopback; 605 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 606 if (in6_ifattach_loopback(ifp) != 0) 607 return; 608 } 609 } 610 611 /* 612 * assign a link-local address, if there's none. 613 */ 614 if (ip6_auto_linklocal) { 615 ia = in6ifa_ifpforlinklocal(ifp, 0); 616 if (ia == NULL) { 617 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 618 /* linklocal address assigned */ 619 } else { 620 /* failed to assign linklocal address. bark? */ 621 } 622 } 623 } 624} 625 626/* 627 * NOTE: in6_ifdetach() does not support loopback if at this moment. 628 */ 629void 630in6_ifdetach(ifp) 631 struct ifnet *ifp; 632{ 633 struct in6_ifaddr *ia, *oia; 634 struct ifaddr *ifa, *next; 635 struct rtentry *rt; 636 struct sockaddr_in6 sin6; 637 struct in6_multi_mship *imm; 638 639#ifdef MROUTING 640 /* remove ip6_mrouter stuff */ 641 ip6_mrouter_detach(ifp); 642#endif 643 644 /* remove neighbor management table */ 645 nd6_purge(ifp); 646 647 /* nuke any of IPv6 addresses we have */ 648 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 649 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 650 next = TAILQ_NEXT(ifa, ifa_list); 651 if (ifa->ifa_addr->sa_family != AF_INET6) 652 continue; 653 in6_purgeaddr(ifa); 654 } 655 656 /* undo everything done by in6_ifattach(), just in case */ 657 for (ifa = TAILQ_FIRST(&ifp->if_addrlist); 658 ifa != TAILQ_END(&ifp->if_addrlist); ifa = next) { 659 next = TAILQ_NEXT(ifa, ifa_list); 660 661 if (ifa->ifa_addr->sa_family != AF_INET6 662 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 663 continue; 664 } 665 666 ia = (struct in6_ifaddr *)ifa; 667 668 /* 669 * leave from multicast groups we have joined for the interface 670 */ 671 while (!LIST_EMPTY(&ia->ia6_memberships)) { 672 imm = LIST_FIRST(&ia->ia6_memberships); 673 LIST_REMOVE(imm, i6mm_chain); 674 in6_leavegroup(imm); 675 } 676 677 /* remove from the routing table */ 678 if ((ia->ia_flags & IFA_ROUTE) && 679 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0))) { 680 struct rt_addrinfo info; 681 u_int8_t prio; 682 683 bzero(&info, sizeof(info)); 684 info.rti_flags = rt->rt_flags; 685 prio = rt->rt_priority; 686 info.rti_info[RTAX_DST] = 687 (struct sockaddr *)&ia->ia_addr; 688 info.rti_info[RTAX_GATEWAY] = 689 (struct sockaddr *)&ia->ia_addr; 690 info.rti_info[RTAX_NETMASK] = 691 (struct sockaddr *)&ia->ia_prefixmask; 692 rtfree(rt); 693 rtrequest1(RTM_DELETE, &info, prio, NULL, 0); 694 } 695 696 /* remove from the linked list */ 697 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 698 IFAFREE(&ia->ia_ifa); 699 700 /* also remove from the IPv6 address chain(itojun&jinmei) */ 701 oia = ia; 702 if (oia == (ia = in6_ifaddr)) 703 in6_ifaddr = ia->ia_next; 704 else { 705 while (ia->ia_next && (ia->ia_next != oia)) 706 ia = ia->ia_next; 707 if (ia->ia_next) 708 ia->ia_next = oia->ia_next; 709 else { 710 nd6log((LOG_ERR, 711 "%s: didn't unlink in6ifaddr from list\n", 712 ifp->if_xname)); 713 } 714 } 715 716 IFAFREE(&oia->ia_ifa); 717 } 718 719 /* cleanup multicast address kludge table, if there is any */ 720 in6_purgemkludge(ifp); 721 722 /* 723 * remove neighbor management table. we call it twice just to make 724 * sure we nuke everything. maybe we need just one call. 725 * XXX: since the first call did not release addresses, some prefixes 726 * might remain. We should call nd6_purge() again to release the 727 * prefixes after removing all addresses above. 728 * (Or can we just delay calling nd6_purge until at this point?) 729 */ 730 nd6_purge(ifp); 731 732 /* remove route to link-local allnodes multicast (ff02::1) */ 733 bzero(&sin6, sizeof(sin6)); 734 sin6.sin6_len = sizeof(struct sockaddr_in6); 735 sin6.sin6_family = AF_INET6; 736 sin6.sin6_addr = in6addr_linklocal_allnodes; 737 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 738 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0); 739 if (rt && rt->rt_ifp == ifp) { 740 struct rt_addrinfo info; 741 742 bzero(&info, sizeof(info)); 743 info.rti_flags = rt->rt_flags; 744 info.rti_info[RTAX_DST] = rt_key(rt); 745 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 746 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 747 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 0); 748 rtfree(rt); 749 } 750} 751