in6_ifattach.c revision 1.120
1 /* $NetBSD: in6_ifattach.c,v 1.120 2021/05/17 04:07:43 yamaguchi 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 1.120 2021/05/17 04:07:43 yamaguchi Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kmem.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 #include <sys/socketvar.h> 45 #include <sys/cprng.h> 46 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/if_types.h> 50 #include <net/route.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_var.h> 54 55 #include <netinet/ip6.h> 56 #include <netinet6/in6_ifattach.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet6/nd6.h> 59 #include <netinet6/ip6_mroute.h> 60 #include <netinet6/scope6_var.h> 61 62 int ip6_auto_linklocal = 1; /* enable by default */ 63 64 #if 0 65 static int get_hostid_ifid(struct ifnet *, struct in6_addr *); 66 #endif 67 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 68 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 69 static int in6_ifattach_loopback(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 #if 0 83 /* 84 * Generate a last-resort interface identifier from hostid. 85 * works only for certain architectures (like sparc). 86 * also, using hostid itself may constitute a privacy threat, much worse 87 * than MAC addresses (hostids are used for software licensing). 88 * maybe we should use MD5(hostid) instead. 89 * 90 * in6 - upper 64bits are preserved 91 */ 92 static int 93 get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6) 94 { 95 int off, len; 96 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 97 static const uint8_t allone[8] = 98 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 99 100 if (!hostid) 101 return -1; 102 103 /* get up to 8 bytes from the hostid field - should we get */ 104 len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid); 105 off = sizeof(*in6) - len; 106 memcpy(&in6->s6_addr[off], &hostid, len); 107 108 /* make sure we do not return anything bogus */ 109 if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero))) 110 return -1; 111 if (memcmp(&in6->s6_addr[8], allone, sizeof(allone))) 112 return -1; 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 #endif 124 125 /* 126 * Generate a last-resort interface identifier, when the machine has no 127 * IEEE802/EUI64 address sources. 128 * The goal here is to get an interface identifier that is 129 * (1) random enough and (2) does not change across reboot. 130 * We currently use MD5(hostname) for it. 131 */ 132 static int 133 get_rand_ifid(struct in6_addr *in6) /* upper 64bits are preserved */ 134 { 135 MD5_CTX ctxt; 136 u_int8_t digest[16]; 137 138 #if 0 139 /* we need at least several letters as seed for ifid */ 140 if (hostnamelen < 3) 141 return -1; 142 #endif 143 144 /* generate 8 bytes of pseudo-random value. */ 145 memset(&ctxt, 0, sizeof(ctxt)); 146 MD5Init(&ctxt); 147 MD5Update(&ctxt, (u_char *)hostname, hostnamelen); 148 MD5Final(digest, &ctxt); 149 150 /* assumes sizeof(digest) > sizeof(ifid) */ 151 memcpy(&in6->s6_addr[8], digest, 8); 152 153 /* make sure to set "u" bit to local, and "g" bit to individual. */ 154 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 155 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 156 157 /* convert EUI64 into IPv6 interface identifier */ 158 EUI64_TO_IFID(in6); 159 160 return 0; 161 } 162 163 /* 164 * Get interface identifier for the specified interface. 165 * 166 * in6 - upper 64bits are preserved 167 */ 168 int 169 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 170 { 171 struct ifaddr *ifa; 172 const struct sockaddr_dl *sdl = NULL; 173 const char *addr = NULL; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ 174 size_t addrlen = 0; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ 175 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 176 static u_int8_t allone[8] = 177 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 178 int s; 179 180 s = pserialize_read_enter(); 181 IFADDR_READER_FOREACH(ifa, ifp) { 182 const struct sockaddr_dl *tsdl; 183 if (ifa->ifa_addr->sa_family != AF_LINK) 184 continue; 185 tsdl = satocsdl(ifa->ifa_addr); 186 if (tsdl == NULL || tsdl->sdl_alen == 0) 187 continue; 188 if (sdl == NULL || ifa == ifp->if_dl || ifa == ifp->if_hwdl) { 189 sdl = tsdl; 190 addr = CLLADDR(sdl); 191 addrlen = sdl->sdl_alen; 192 } 193 if (ifa == ifp->if_hwdl) 194 break; 195 } 196 pserialize_read_exit(s); 197 198 if (sdl == NULL) 199 return -1; 200 201 switch (ifp->if_type) { 202 case IFT_IEEE1394: 203 case IFT_IEEE80211: 204 /* IEEE1394 uses 16byte length address starting with EUI64 */ 205 if (addrlen > 8) 206 addrlen = 8; 207 break; 208 default: 209 break; 210 } 211 212 /* get EUI64 */ 213 switch (ifp->if_type) { 214 /* IEEE802/EUI64 cases - what others? */ 215 case IFT_ETHER: 216 case IFT_ATM: 217 case IFT_IEEE1394: 218 case IFT_IEEE80211: 219 /* look at IEEE802/EUI64 only */ 220 if (addrlen != 8 && addrlen != 6) 221 return -1; 222 223 /* 224 * check for invalid MAC address - on bsdi, we see it a lot 225 * since wildboar configures all-zero MAC on pccard before 226 * card insertion. 227 */ 228 if (memcmp(addr, allzero, addrlen) == 0) 229 return -1; 230 if (memcmp(addr, allone, addrlen) == 0) 231 return -1; 232 233 /* make EUI64 address */ 234 if (addrlen == 8) 235 memcpy(&in6->s6_addr[8], addr, 8); 236 else if (addrlen == 6) { 237 in6->s6_addr[8] = addr[0]; 238 in6->s6_addr[9] = addr[1]; 239 in6->s6_addr[10] = addr[2]; 240 in6->s6_addr[11] = 0xff; 241 in6->s6_addr[12] = 0xfe; 242 in6->s6_addr[13] = addr[3]; 243 in6->s6_addr[14] = addr[4]; 244 in6->s6_addr[15] = addr[5]; 245 } 246 break; 247 248 case IFT_ARCNET: 249 if (addrlen != 1) 250 return -1; 251 if (!addr[0]) 252 return -1; 253 254 memset(&in6->s6_addr[8], 0, 8); 255 in6->s6_addr[15] = addr[0]; 256 257 /* 258 * due to insufficient bitwidth, we mark it local. 259 */ 260 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 261 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 262 break; 263 264 case IFT_GIF: 265 #ifdef IFT_STF 266 case IFT_STF: 267 #endif 268 /* 269 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 270 * however, IPv4 address is not very suitable as unique 271 * identifier source (can be renumbered). 272 * we don't do this. 273 */ 274 return -1; 275 276 default: 277 return -1; 278 } 279 280 /* sanity check: g bit must not indicate "group" */ 281 if (EUI64_GROUP(in6)) 282 return -1; 283 284 /* convert EUI64 into IPv6 interface identifier */ 285 EUI64_TO_IFID(in6); 286 287 /* 288 * sanity check: ifid must not be all zero, avoid conflict with 289 * subnet router anycast 290 */ 291 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 292 memcmp(&in6->s6_addr[9], allzero, 7) == 0) { 293 return -1; 294 } 295 296 return 0; 297 } 298 299 /* 300 * Get interface identifier for the specified interface. If it is not 301 * available on ifp0, borrow interface identifier from other information 302 * sources. 303 * 304 * altifp - secondary EUI64 source 305 */ 306 static int 307 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 308 struct in6_addr *in6) 309 { 310 struct ifnet *ifp; 311 int s; 312 313 /* first, try to get it from the interface itself */ 314 if (in6_get_hw_ifid(ifp0, in6) == 0) { 315 nd6log(LOG_DEBUG, "%s: got interface identifier from itself\n", 316 if_name(ifp0)); 317 goto success; 318 } 319 320 /* try secondary EUI64 source. this basically is for ATM PVC */ 321 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 322 nd6log(LOG_DEBUG, "%s: got interface identifier from %s\n", 323 if_name(ifp0), if_name(altifp)); 324 goto success; 325 } 326 327 /* next, try to get it from some other hardware interface */ 328 s = pserialize_read_enter(); 329 IFNET_READER_FOREACH(ifp) { 330 if (ifp == ifp0) 331 continue; 332 if (in6_get_hw_ifid(ifp, in6) != 0) 333 continue; 334 335 /* 336 * to borrow ifid from other interface, ifid needs to be 337 * globally unique 338 */ 339 if (IFID_UNIVERSAL(in6)) { 340 nd6log(LOG_DEBUG, 341 "%s: borrow interface identifier from %s\n", 342 if_name(ifp0), if_name(ifp)); 343 pserialize_read_exit(s); 344 goto success; 345 } 346 } 347 pserialize_read_exit(s); 348 349 #if 0 350 /* get from hostid - only for certain architectures */ 351 if (get_hostid_ifid(ifp, in6) == 0) { 352 nd6log(LOG_DEBUG, 353 "%s: interface identifier generated by hostid\n", 354 if_name(ifp0)); 355 goto success; 356 } 357 #endif 358 359 /* last resort: get from random number source */ 360 if (get_rand_ifid(in6) == 0) { 361 nd6log(LOG_DEBUG, 362 "%s: interface identifier generated by random number\n", 363 if_name(ifp0)); 364 goto success; 365 } 366 367 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 368 return -1; 369 370 success: 371 nd6log(LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 372 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 373 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 374 in6->s6_addr[14], in6->s6_addr[15]); 375 return 0; 376 } 377 378 /* 379 * altifp - secondary EUI64 source 380 */ 381 382 static int 383 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 384 { 385 struct in6_aliasreq ifra; 386 int error; 387 388 /* 389 * configure link-local address. 390 */ 391 memset(&ifra, 0, sizeof(ifra)); 392 393 /* 394 * in6_update_ifa() does not use ifra_name, but we accurately set it 395 * for safety. 396 */ 397 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 398 399 ifra.ifra_addr.sin6_family = AF_INET6; 400 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 401 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 402 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 403 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 404 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 405 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 406 } else { 407 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 408 nd6log(LOG_ERR, 409 "%s: no ifid available\n", if_name(ifp)); 410 return -1; 411 } 412 } 413 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 414 return -1; 415 416 sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0); 417 /* link-local addresses should NEVER expire. */ 418 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 419 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 420 421 /* 422 * Now call in6_update_ifa() to do a bunch of procedures to configure 423 * a link-local address. We can set the 3rd argument to NULL, because 424 * we know there's no other link-local address on the interface 425 * and therefore we are adding one (instead of updating one). 426 */ 427 if ((error = in6_update_ifa(ifp, &ifra, IN6_IFAUPDATE_DADDELAY)) != 0) { 428 /* 429 * XXX: When the interface does not support IPv6, this call 430 * would fail in the SIOCINITIFADDR ioctl. I believe the 431 * notification is rather confusing in this case, so just 432 * suppress it. (jinmei (at) kame.net 20010130) 433 */ 434 if (error != EAFNOSUPPORT) 435 nd6log(LOG_NOTICE, 436 "failed to configure a link-local address on %s " 437 "(errno=%d)\n", 438 if_name(ifp), error); 439 return -1; 440 } 441 442 return 0; 443 } 444 445 /* 446 * ifp - mut be IFT_LOOP 447 */ 448 449 static int 450 in6_ifattach_loopback(struct ifnet *ifp) 451 { 452 struct in6_aliasreq ifra; 453 int error; 454 455 memset(&ifra, 0, sizeof(ifra)); 456 457 /* 458 * in6_update_ifa() does not use ifra_name, but we accurately set it 459 * for safety. 460 */ 461 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 462 463 sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0); 464 465 /* 466 * Always initialize ia_dstaddr (= broadcast address) to loopback 467 * address. Follows IPv4 practice - see in_ifinit(). 468 */ 469 sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0); 470 471 sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0); 472 473 /* the loopback address should NEVER expire. */ 474 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 475 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 476 477 /* we don't need to perform DAD on loopback interfaces. */ 478 ifra.ifra_flags |= IN6_IFF_NODAD; 479 480 /* 481 * We are sure that this is a newly assigned address, so we can set 482 * NULL to the 3rd arg. 483 */ 484 if ((error = in6_update_ifa(ifp, &ifra, 0)) != 0) { 485 nd6log(LOG_ERR, "failed to configure " 486 "the loopback address on %s (errno=%d)\n", 487 if_name(ifp), error); 488 return -1; 489 } 490 491 return 0; 492 } 493 494 /* 495 * compute NI group address, based on the current hostname setting. 496 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 497 * 498 * when ifp == NULL, the caller is responsible for filling scopeid. 499 */ 500 int 501 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 502 struct sockaddr_in6 *sa6) 503 { 504 const char *p; 505 u_int8_t *q; 506 MD5_CTX ctxt; 507 u_int8_t digest[16]; 508 u_int8_t l; 509 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 510 511 if (!namelen || !name) 512 return -1; 513 514 p = name; 515 while (p && *p && *p != '.' && p - name < namelen) 516 p++; 517 if (p - name > sizeof(n) - 1) 518 return -1; /* label too long */ 519 l = p - name; 520 strncpy((char *)n, name, l); 521 n[(int)l] = '\0'; 522 for (q = n; *q; q++) { 523 if ('A' <= *q && *q <= 'Z') 524 *q = *q - 'A' + 'a'; 525 } 526 527 /* generate 8 bytes of pseudo-random value. */ 528 memset(&ctxt, 0, sizeof(ctxt)); 529 MD5Init(&ctxt); 530 MD5Update(&ctxt, &l, sizeof(l)); 531 MD5Update(&ctxt, n, l); 532 MD5Final(digest, &ctxt); 533 534 memset(sa6, 0, sizeof(*sa6)); 535 sa6->sin6_family = AF_INET6; 536 sa6->sin6_len = sizeof(*sa6); 537 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 538 sa6->sin6_addr.s6_addr8[11] = 2; 539 memcpy(&sa6->sin6_addr.s6_addr32[3], digest, 540 sizeof(sa6->sin6_addr.s6_addr32[3])); 541 if (in6_setscope(&sa6->sin6_addr, ifp, NULL)) 542 return -1; /* XXX: should not fail */ 543 544 return 0; 545 } 546 547 /* 548 * XXX multiple loopback interface needs more care. for instance, 549 * nodelocal address needs to be configured onto only one of them. 550 * XXX multiple link-local address case 551 * 552 * altifp - secondary EUI64 source 553 */ 554 void 555 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 556 { 557 struct in6_ifaddr *ia; 558 struct in6_addr in6; 559 560 KASSERT(IFNET_LOCKED(ifp)); 561 562 /* some of the interfaces are inherently not IPv6 capable */ 563 switch (ifp->if_type) { 564 case IFT_BRIDGE: 565 case IFT_L2TP: 566 case IFT_IEEE8023ADLAG: 567 #ifdef IFT_PFLOG 568 case IFT_PFLOG: 569 #endif 570 #ifdef IFT_PFSYNC 571 case IFT_PFSYNC: 572 #endif 573 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 574 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 575 return; 576 } 577 578 /* 579 * if link mtu is too small, don't try to configure IPv6. 580 * remember there could be some link-layer that has special 581 * fragmentation logic. 582 */ 583 if (ifp->if_mtu < IPV6_MMTU) { 584 nd6log(LOG_INFO, "%s has too small MTU, IPv6 not enabled\n", 585 if_name(ifp)); 586 return; 587 } 588 589 /* 590 * quirks based on interface type 591 */ 592 switch (ifp->if_type) { 593 #ifdef IFT_STF 594 case IFT_STF: 595 /* 596 * 6to4 interface is a very special kind of beast. 597 * no multicast, no linklocal. RFC2529 specifies how to make 598 * linklocals for 6to4 interface, but there's no use and 599 * it is rather harmful to have one. 600 */ 601 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 602 return; 603 #endif 604 case IFT_CARP: 605 return; 606 default: 607 break; 608 } 609 610 /* 611 * usually, we require multicast capability to the interface 612 */ 613 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 614 nd6log(LOG_INFO, 615 "%s is not multicast capable, IPv6 not enabled\n", 616 if_name(ifp)); 617 return; 618 } 619 620 /* 621 * assign loopback address for loopback interface. 622 * XXX multiple loopback interface case. 623 */ 624 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 625 in6 = in6addr_loopback; 626 /* These are safe and atomic thanks to IFNET_LOCK */ 627 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 628 if (in6_ifattach_loopback(ifp) != 0) 629 return; 630 } 631 } 632 633 /* 634 * assign a link-local address, if there's none. 635 */ 636 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 637 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 638 int bound = curlwp_bind(); 639 struct psref psref; 640 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 641 if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) { 642 printf("%s: cannot assign link-local address\n", 643 ifp->if_xname); 644 } 645 ia6_release(ia, &psref); 646 curlwp_bindx(bound); 647 } 648 } 649 650 /* 651 * NOTE: in6_ifdetach() does not support loopback if at this moment. 652 * We don't need this function in bsdi, because interfaces are never removed 653 * from the ifnet list in bsdi. 654 */ 655 void 656 in6_ifdetach(struct ifnet *ifp) 657 { 658 659 /* nuke any of IPv6 addresses we have */ 660 if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); 661 662 in6_purge_multi(ifp); 663 664 /* remove ip6_mrouter stuff */ 665 ip6_mrouter_detach(ifp); 666 667 /* remove neighbor management table */ 668 nd6_purge(ifp, NULL); 669 } 670
Indexes created Sat Sep 27 14:09:57 GMT 2025