in6_ifattach.c revision 1.68
1/* $OpenBSD: in6_ifattach.c,v 1.68 2014/01/21 10:18:26 mpi 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_var.h> 45#include <net/if_dl.h> 46#include <net/if_types.h> 47#include <net/route.h> 48 49#include <netinet/in.h> 50#include <netinet/if_ether.h> 51 52#include <netinet6/in6_var.h> 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#ifdef MROUTING 59#include <netinet6/ip6_mroute.h> 60#endif 61 62#include <dev/rndvar.h> 63 64unsigned long in6_maxmtu = 0; 65 66int ip6_auto_linklocal = 1; /* enable by default */ 67 68int get_last_resort_ifid(struct ifnet *, struct in6_addr *); 69int get_hw_ifid(struct ifnet *, struct in6_addr *); 70int get_ifid(struct ifnet *, struct in6_addr *); 71int in6_ifattach_loopback(struct ifnet *); 72 73#define EUI64_GBIT 0x01 74#define EUI64_UBIT 0x02 75#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 76#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 77#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 78#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 79#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 80 81#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 82#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 83 84/* 85 * Generate a last-resort interface identifier, when the machine has no 86 * IEEE802/EUI64 address sources. 87 * The goal here is to get an interface identifier that is 88 * (1) random enough and (2) does not change across reboot. 89 * We currently use MD5(hostname) for it. 90 * 91 * in6 - upper 64bits are preserved 92 */ 93int 94get_last_resort_ifid(struct ifnet *ifp, struct in6_addr *in6) 95{ 96 MD5_CTX ctxt; 97 u_int8_t digest[16]; 98 99#if 0 100 /* we need at least several letters as seed for ifid */ 101 if (hostnamelen < 3) 102 return -1; 103#endif 104 105 /* generate 8 bytes of pseudo-random value. */ 106 bzero(&ctxt, sizeof(ctxt)); 107 MD5Init(&ctxt); 108 MD5Update(&ctxt, hostname, hostnamelen); 109 MD5Final(digest, &ctxt); 110 111 /* assumes sizeof(digest) > sizeof(ifid) */ 112 bcopy(digest, &in6->s6_addr[8], 8); 113 114 /* make sure to set "u" bit to local, and "g" bit to individual. */ 115 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 116 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 117 118 /* convert EUI64 into IPv6 interface identifier */ 119 EUI64_TO_IFID(in6); 120 121 return 0; 122} 123 124/* 125 * Generate a random interface identifier. 126 * 127 * in6 - upper 64bits are preserved 128 */ 129void 130in6_get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 131{ 132 arc4random_buf(&in6->s6_addr32[2], 8); 133 134 /* make sure to set "u" bit to local, and "g" bit to individual. */ 135 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 136 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 137 138 /* convert EUI64 into IPv6 interface identifier */ 139 EUI64_TO_IFID(in6); 140} 141 142/* 143 * Get interface identifier for the specified interface. 144 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 145 * 146 * in6 - upper 64bits are preserved 147 */ 148int 149get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 150{ 151 struct ifaddr *ifa; 152 struct sockaddr_dl *sdl; 153 char *addr; 154 size_t addrlen; 155 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 156 static u_int8_t allone[8] = 157 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 158 159 TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) { 160 if (ifa->ifa_addr->sa_family != AF_LINK) 161 continue; 162 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 163 if (sdl == NULL) 164 continue; 165 if (sdl->sdl_alen == 0) 166 continue; 167 168 goto found; 169 } 170 171 return -1; 172 173found: 174 addr = LLADDR(sdl); 175 addrlen = sdl->sdl_alen; 176 177 switch (ifp->if_type) { 178 case IFT_IEEE1394: 179 case IFT_IEEE80211: 180 /* IEEE1394 uses 16byte length address starting with EUI64 */ 181 if (addrlen > 8) 182 addrlen = 8; 183 break; 184 default: 185 break; 186 } 187 188 /* get EUI64 */ 189 switch (ifp->if_type) { 190 /* IEEE802/EUI64 cases - what others? */ 191 case IFT_ETHER: 192 case IFT_CARP: 193 case IFT_IEEE1394: 194 case IFT_IEEE80211: 195 /* look at IEEE802/EUI64 only */ 196 if (addrlen != 8 && addrlen != 6) 197 return -1; 198 199 /* 200 * check for invalid MAC address - on bsdi, we see it a lot 201 * since wildboar configures all-zero MAC on pccard before 202 * card insertion. 203 */ 204 if (bcmp(addr, allzero, addrlen) == 0) 205 return -1; 206 if (bcmp(addr, allone, addrlen) == 0) 207 return -1; 208 209 /* make EUI64 address */ 210 if (addrlen == 8) 211 bcopy(addr, &in6->s6_addr[8], 8); 212 else if (addrlen == 6) { 213 in6->s6_addr[8] = addr[0]; 214 in6->s6_addr[9] = addr[1]; 215 in6->s6_addr[10] = addr[2]; 216 in6->s6_addr[11] = 0xff; 217 in6->s6_addr[12] = 0xfe; 218 in6->s6_addr[13] = addr[3]; 219 in6->s6_addr[14] = addr[4]; 220 in6->s6_addr[15] = addr[5]; 221 } 222 break; 223 224 case IFT_GIF: 225 /* 226 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 227 * however, IPv4 address is not very suitable as unique 228 * identifier source (can be renumbered). 229 * we don't do this. 230 */ 231 return -1; 232 233 default: 234 return -1; 235 } 236 237 /* sanity check: g bit must not indicate "group" */ 238 if (EUI64_GROUP(in6)) 239 return -1; 240 241 /* convert EUI64 into IPv6 interface identifier */ 242 EUI64_TO_IFID(in6); 243 244 /* 245 * sanity check: ifid must not be all zero, avoid conflict with 246 * subnet router anycast 247 */ 248 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 249 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 250 return -1; 251 } 252 253 return 0; 254} 255 256/* 257 * Get interface identifier for the specified interface. If it is not 258 * available on ifp0, borrow interface identifier from other information 259 * sources. 260 */ 261int 262get_ifid(struct ifnet *ifp0, 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 /* next, try to get it from some other hardware interface */ 274 TAILQ_FOREACH(ifp, &ifnet, if_list) { 275 if (ifp == ifp0) 276 continue; 277 if (get_hw_ifid(ifp, in6) != 0) 278 continue; 279 280 /* 281 * to borrow ifid from other interface, ifid needs to be 282 * globally unique 283 */ 284 if (IFID_UNIVERSAL(in6)) { 285 nd6log((LOG_DEBUG, 286 "%s: borrow interface identifier from %s\n", 287 ifp0->if_xname, ifp->if_xname)); 288 goto success; 289 } 290 } 291 292 /* last resort: get from random number source */ 293 if (get_last_resort_ifid(ifp, in6) == 0) { 294 nd6log((LOG_DEBUG, 295 "%s: interface identifier generated by random number\n", 296 ifp0->if_xname)); 297 goto success; 298 } 299 300 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 301 return -1; 302 303success: 304 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 305 ifp0->if_xname, in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 306 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 307 in6->s6_addr[14], in6->s6_addr[15])); 308 return 0; 309} 310 311/* 312 * ifid - used as EUI64 if not NULL, overrides other EUI64 sources 313 */ 314 315int 316in6_ifattach_linklocal(struct ifnet *ifp, struct in6_addr *ifid) 317{ 318 struct in6_ifaddr *ia6; 319 struct in6_aliasreq ifra; 320 struct nd_prefix pr0; 321 int i, s, error; 322 323 /* 324 * configure link-local address. 325 */ 326 bzero(&ifra, sizeof(ifra)); 327 328 /* 329 * in6_update_ifa() does not use ifra_name, but we accurately set it 330 * for safety. 331 */ 332 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 333 334 ifra.ifra_addr.sin6_family = AF_INET6; 335 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 336 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 337 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 338 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 339 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 340 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 341 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 342 } else if (ifid) { 343 ifra.ifra_addr.sin6_addr = *ifid; 344 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 345 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 346 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 347 ifra.ifra_addr.sin6_addr.s6_addr[8] &= ~EUI64_GBIT; 348 ifra.ifra_addr.sin6_addr.s6_addr[8] |= EUI64_UBIT; 349 } else { 350 if (get_ifid(ifp, &ifra.ifra_addr.sin6_addr) != 0) { 351 nd6log((LOG_ERR, 352 "%s: no ifid available\n", ifp->if_xname)); 353 return (-1); 354 } 355 } 356 357 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 358 ifra.ifra_prefixmask.sin6_family = AF_INET6; 359 ifra.ifra_prefixmask.sin6_addr = in6mask64; 360 /* link-local addresses should NEVER expire. */ 361 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 362 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 363 364 /* 365 * Do not let in6_update_ifa() do DAD, since we need a random delay 366 * before sending an NS at the first time the interface becomes up. 367 * Instead, in6_if_up() will start DAD with a proper random delay. 368 */ 369 ifra.ifra_flags |= IN6_IFF_NODAD; 370 371 /* 372 * Now call in6_update_ifa() to do a bunch of procedures to configure 373 * a link-local address. In the case of CARP, we may be called after 374 * one has already been configured, so check if it's already there 375 * with in6ifa_ifpforlinklocal() and clobber it if it exists. 376 */ 377 s = splsoftnet(); 378 error = in6_update_ifa(ifp, &ifra, in6ifa_ifpforlinklocal(ifp, 0)); 379 splx(s); 380 381 if (error != 0) { 382 /* 383 * XXX: When the interface does not support IPv6, this call 384 * would fail in the SIOCSIFADDR ioctl. I believe the 385 * notification is rather confusing in this case, so just 386 * suppress it. (jinmei@kame.net 20010130) 387 */ 388 if (error != EAFNOSUPPORT) 389 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 390 "configure a link-local address on %s " 391 "(errno=%d)\n", 392 ifp->if_xname, error)); 393 return (-1); 394 } 395 396 /* 397 * Adjust ia6_flags so that in6_if_up will perform DAD. 398 * XXX: Some P2P interfaces seem not to send packets just after 399 * becoming up, so we skip p2p interfaces for safety. 400 */ 401 ia6 = in6ifa_ifpforlinklocal(ifp, 0); /* ia6 must not be NULL */ 402#ifdef DIAGNOSTIC 403 if (!ia6) { 404 panic("ia6 == NULL in in6_ifattach_linklocal"); 405 /* NOTREACHED */ 406 } 407#endif 408 if (in6if_do_dad(ifp) && ((ifp->if_flags & IFF_POINTOPOINT) || 409 (ifp->if_type == IFT_CARP)) == 0) { 410 ia6->ia6_flags &= ~IN6_IFF_NODAD; 411 ia6->ia6_flags |= IN6_IFF_TENTATIVE; 412 } 413 414 /* 415 * Make the link-local prefix (fe80::/64%link) as on-link. 416 * Since we'd like to manage prefixes separately from addresses, 417 * we make an ND6 prefix structure for the link-local prefix, 418 * and add it to the prefix list as a never-expire prefix. 419 * XXX: this change might affect some existing code base... 420 */ 421 bzero(&pr0, sizeof(pr0)); 422 pr0.ndpr_ifp = ifp; 423 /* this should be 64 at this moment. */ 424 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 425 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 426 pr0.ndpr_prefix = ifra.ifra_addr; 427 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 428 for (i = 0; i < 4; i++) { 429 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 430 in6mask64.s6_addr32[i]; 431 } 432 /* 433 * Initialize parameters. The link-local prefix must always be 434 * on-link, and its lifetimes never expire. 435 */ 436 pr0.ndpr_raf_onlink = 1; 437 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 438 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 439 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 440 /* 441 * Since there is no other link-local addresses, nd6_prefix_lookup() 442 * probably returns NULL. However, we cannot always expect the result. 443 * For example, if we first remove the (only) existing link-local 444 * address, and then reconfigure another one, the prefix is still 445 * valid with referring to the old link-local address. 446 */ 447 if (nd6_prefix_lookup(&pr0) == NULL) { 448 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 449 return (error); 450 } 451 452 return 0; 453} 454 455/* 456 * ifp - must be IFT_LOOP 457 */ 458 459int 460in6_ifattach_loopback(struct ifnet *ifp) 461{ 462 struct in6_aliasreq ifra; 463 int error; 464 465 bzero(&ifra, sizeof(ifra)); 466 467 /* 468 * in6_update_ifa() does not use ifra_name, but we accurately set it 469 * for safety. 470 */ 471 strncpy(ifra.ifra_name, ifp->if_xname, sizeof(ifra.ifra_name)); 472 473 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 474 ifra.ifra_prefixmask.sin6_family = AF_INET6; 475 ifra.ifra_prefixmask.sin6_addr = in6mask128; 476 477 /* 478 * Always initialize ia_dstaddr (= broadcast address) to loopback 479 * address. Follows IPv4 practice - see in_ifinit(). 480 */ 481 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 482 ifra.ifra_dstaddr.sin6_family = AF_INET6; 483 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 484 485 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 486 ifra.ifra_addr.sin6_family = AF_INET6; 487 ifra.ifra_addr.sin6_addr = in6addr_loopback; 488 489 /* the loopback address should NEVER expire. */ 490 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 491 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 492 493 /* we don't need to perform DAD on loopback interfaces. */ 494 ifra.ifra_flags |= IN6_IFF_NODAD; 495 496 /* 497 * We are sure that this is a newly assigned address, so we can set 498 * NULL to the 3rd arg. 499 */ 500 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 501 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 502 "the loopback address on %s (errno=%d)\n", 503 ifp->if_xname, error)); 504 return (-1); 505 } 506 507 return 0; 508} 509 510/* 511 * compute NI group address, based on the current hostname setting. 512 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 513 * 514 * when ifp == NULL, the caller is responsible for filling scopeid. 515 */ 516int 517in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 518 struct sockaddr_in6 *sa6) 519{ 520 const char *p; 521 u_int8_t *q; 522 MD5_CTX ctxt; 523 u_int8_t digest[16]; 524 u_int8_t l; 525 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 526 527 if (!namelen || !name) 528 return -1; 529 530 p = name; 531 while (p && *p && *p != '.' && p - name < namelen) 532 p++; 533 if (p - name > sizeof(n) - 1) 534 return -1; /* label too long */ 535 l = p - name; 536 strncpy((char *)n, name, l); 537 n[(int)l] = '\0'; 538 for (q = n; *q; q++) { 539 if ('A' <= *q && *q <= 'Z') 540 *q = *q - 'A' + 'a'; 541 } 542 543 /* generate 8 bytes of pseudo-random value. */ 544 bzero(&ctxt, sizeof(ctxt)); 545 MD5Init(&ctxt); 546 MD5Update(&ctxt, &l, sizeof(l)); 547 MD5Update(&ctxt, n, l); 548 MD5Final(digest, &ctxt); 549 550 bzero(sa6, sizeof(*sa6)); 551 sa6->sin6_family = AF_INET6; 552 sa6->sin6_len = sizeof(*sa6); 553 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 554 sa6->sin6_addr.s6_addr16[1] = htons(ifp->if_index); 555 sa6->sin6_addr.s6_addr8[11] = 2; 556 bcopy(digest, &sa6->sin6_addr.s6_addr32[3], 557 sizeof(sa6->sin6_addr.s6_addr32[3])); 558 559 return 0; 560} 561 562/* 563 * XXX multiple loopback interface needs more care. for instance, 564 * nodelocal address needs to be configured onto only one of them. 565 * XXX multiple link-local address case 566 */ 567void 568in6_ifattach(struct ifnet *ifp) 569{ 570 struct in6_ifaddr *ia6; 571 struct in6_addr in6; 572 573 /* some of the interfaces are inherently not IPv6 capable */ 574 switch (ifp->if_type) { 575 case IFT_BRIDGE: 576 case IFT_ENC: 577 case IFT_PFLOG: 578 case IFT_PFSYNC: 579 return; 580 } 581 582 /* 583 * if link mtu is too small, don't try to configure IPv6. 584 * remember there could be some link-layer that has special 585 * fragmentation logic. 586 */ 587 if (ifp->if_mtu < IPV6_MMTU) { 588 nd6log((LOG_INFO, "in6_ifattach: " 589 "%s has too small MTU, IPv6 not enabled\n", 590 ifp->if_xname)); 591 return; 592 } 593 594 /* 595 * quirks based on interface type 596 */ 597 switch (ifp->if_type) { 598 /* we attach a link-local address when a vhid is assigned */ 599 case IFT_CARP: 600 return; 601 default: 602 break; 603 } 604 605 /* 606 * usually, we require multicast capability to the interface 607 */ 608 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 609 nd6log((LOG_INFO, "in6_ifattach: " 610 "%s is not multicast capable, IPv6 not enabled\n", 611 ifp->if_xname)); 612 return; 613 } 614 615 /* 616 * assign loopback address for loopback interface. 617 * XXX multiple loopback interface case. 618 */ 619 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 620 in6 = in6addr_loopback; 621 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 622 if (in6_ifattach_loopback(ifp) != 0) 623 return; 624 } 625 } 626 627 /* 628 * assign a link-local address, if there's none. 629 */ 630 if (ip6_auto_linklocal) { 631 ia6 = in6ifa_ifpforlinklocal(ifp, 0); 632 if (ia6 == NULL) { 633 if (in6_ifattach_linklocal(ifp, NULL) == 0) { 634 /* linklocal address assigned */ 635 } else { 636 /* failed to assign linklocal address. bark? */ 637 } 638 } 639 } 640} 641 642/* 643 * NOTE: in6_ifdetach() does not support loopback if at this moment. 644 */ 645void 646in6_ifdetach(struct ifnet *ifp) 647{ 648 struct ifaddr *ifa, *next; 649 struct rtentry *rt; 650 struct sockaddr_in6 sin6; 651 652#ifdef MROUTING 653 /* remove ip6_mrouter stuff */ 654 ip6_mrouter_detach(ifp); 655#endif 656 657 /* remove neighbor management table */ 658 nd6_purge(ifp); 659 660 /* nuke any of IPv6 addresses we have */ 661 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrlist, ifa_list, next) { 662 if (ifa->ifa_addr->sa_family != AF_INET6) 663 continue; 664 in6_purgeaddr(ifa); 665 } 666 667 /* 668 * remove neighbor management table. we call it twice just to make 669 * sure we nuke everything. maybe we need just one call. 670 * XXX: since the first call did not release addresses, some prefixes 671 * might remain. We should call nd6_purge() again to release the 672 * prefixes after removing all addresses above. 673 * (Or can we just delay calling nd6_purge until at this point?) 674 */ 675 nd6_purge(ifp); 676 677 /* remove route to interface local allnodes multicast (ff01::1) */ 678 bzero(&sin6, sizeof(sin6)); 679 sin6.sin6_len = sizeof(struct sockaddr_in6); 680 sin6.sin6_family = AF_INET6; 681 sin6.sin6_addr = in6addr_intfacelocal_allnodes; 682 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 683 rt = rtalloc1(sin6tosa(&sin6), 0, ifp->if_rdomain); 684 if (rt && rt->rt_ifp == ifp) { 685 struct rt_addrinfo info; 686 687 bzero(&info, sizeof(info)); 688 info.rti_flags = rt->rt_flags; 689 info.rti_info[RTAX_DST] = rt_key(rt); 690 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 691 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 692 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 693 ifp->if_rdomain); 694 rtfree(rt); 695 } 696 697 /* remove route to link-local allnodes multicast (ff02::1) */ 698 bzero(&sin6, sizeof(sin6)); 699 sin6.sin6_len = sizeof(struct sockaddr_in6); 700 sin6.sin6_family = AF_INET6; 701 sin6.sin6_addr = in6addr_linklocal_allnodes; 702 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 703 rt = rtalloc1(sin6tosa(&sin6), 0, ifp->if_rdomain); 704 if (rt && rt->rt_ifp == ifp) { 705 struct rt_addrinfo info; 706 707 bzero(&info, sizeof(info)); 708 info.rti_flags = rt->rt_flags; 709 info.rti_info[RTAX_DST] = rt_key(rt); 710 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; 711 info.rti_info[RTAX_NETMASK] = rt_mask(rt); 712 rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, 713 ifp->if_rdomain); 714 rtfree(rt); 715 } 716} 717