1 /* $NetBSD: in6_ifattach.c,v 1.46 2002/05/29 07:53:40 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 1.46 2002/05/29 07:53:40 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 59 #include <net/net_osdep.h> 60 61 unsigned long in6_maxmtu = 0; 62 63 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 64 static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); 65 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 66 static int in6_ifattach_addaddr __P((struct ifnet *, struct in6_ifaddr *)); 67 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 68 static int in6_ifattach_loopback __P((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 */ 88 static int 89 get_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 */ 125 static int 126 get_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 u_int8_t *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 for (ifa = ifp->if_addrlist.tqh_first; 139 ifa; 140 ifa = ifa->ifa_list.tqe_next) 141 { 142 if (ifa->ifa_addr->sa_family != AF_LINK) 143 continue; 144 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 145 if (sdl == NULL) 146 continue; 147 if (sdl->sdl_alen == 0) 148 continue; 149 150 goto found; 151 } 152 153 return -1; 154 155 found: 156 addr = LLADDR(sdl); 157 addrlen = sdl->sdl_alen; 158 159 /* get EUI64 */ 160 switch (ifp->if_type) { 161 case IFT_ETHER: 162 case IFT_FDDI: 163 case IFT_ATM: 164 case IFT_IEEE1394: 165 /* IEEE802/EUI64 cases - what others? */ 166 /* IEEE1394 uses 16byte length address starting with EUI64 */ 167 if (addrlen > 8) 168 addrlen = 8; 169 170 /* look at IEEE802/EUI64 only */ 171 if (addrlen != 8 && addrlen != 6) 172 return -1; 173 174 /* 175 * check for invalid MAC address - on bsdi, we see it a lot 176 * since wildboar configures all-zero MAC on pccard before 177 * card insertion. 178 */ 179 if (bcmp(addr, allzero, addrlen) == 0) 180 return -1; 181 if (bcmp(addr, allone, addrlen) == 0) 182 return -1; 183 184 /* make EUI64 address */ 185 if (addrlen == 8) 186 bcopy(addr, &in6->s6_addr[8], 8); 187 else if (addrlen == 6) { 188 in6->s6_addr[8] = addr[0]; 189 in6->s6_addr[9] = addr[1]; 190 in6->s6_addr[10] = addr[2]; 191 in6->s6_addr[11] = 0xff; 192 in6->s6_addr[12] = 0xfe; 193 in6->s6_addr[13] = addr[3]; 194 in6->s6_addr[14] = addr[4]; 195 in6->s6_addr[15] = addr[5]; 196 } 197 break; 198 199 case IFT_ARCNET: 200 if (addrlen != 1) 201 return -1; 202 if (!addr[0]) 203 return -1; 204 205 bzero(&in6->s6_addr[8], 8); 206 in6->s6_addr[15] = addr[0]; 207 208 /* 209 * due to insufficient bitwidth, we mark it local. 210 */ 211 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 212 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 213 break; 214 215 case IFT_GIF: 216 #ifdef IFT_STF 217 case IFT_STF: 218 #endif 219 /* 220 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 221 * however, IPv4 address is not very suitable as unique 222 * identifier source (can be renumbered). 223 * we don't do this. 224 */ 225 return -1; 226 227 default: 228 return -1; 229 } 230 231 /* sanity check: g bit must not indicate "group" */ 232 if (EUI64_GROUP(in6)) 233 return -1; 234 235 /* convert EUI64 into IPv6 interface identifier */ 236 EUI64_TO_IFID(in6); 237 238 /* 239 * sanity check: ifid must not be all zero, avoid conflict with 240 * subnet router anycast 241 */ 242 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 243 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 244 return -1; 245 } 246 247 return 0; 248 } 249 250 /* 251 * Get interface identifier for the specified interface. If it is not 252 * available on ifp0, borrow interface identifier from other information 253 * sources. 254 */ 255 static int 256 get_ifid(ifp0, altifp, in6) 257 struct ifnet *ifp0; 258 struct ifnet *altifp; /*secondary EUI64 source*/ 259 struct in6_addr *in6; 260 { 261 struct ifnet *ifp; 262 263 /* first, try to get it from the interface itself */ 264 if (get_hw_ifid(ifp0, in6) == 0) { 265 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 266 if_name(ifp0))); 267 goto success; 268 } 269 270 /* try secondary EUI64 source. this basically is for ATM PVC */ 271 if (altifp && get_hw_ifid(altifp, in6) == 0) { 272 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 273 if_name(ifp0), if_name(altifp))); 274 goto success; 275 } 276 277 /* next, try to get it from some other hardware interface */ 278 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 279 { 280 if (ifp == ifp0) 281 continue; 282 if (get_hw_ifid(ifp, in6) != 0) 283 continue; 284 285 /* 286 * to borrow ifid from other interface, ifid needs to be 287 * globally unique 288 */ 289 if (IFID_UNIVERSAL(in6)) { 290 nd6log((LOG_DEBUG, 291 "%s: borrow interface identifier from %s\n", 292 if_name(ifp0), if_name(ifp))); 293 goto success; 294 } 295 } 296 297 /* last resort: get from random number source */ 298 if (get_rand_ifid(ifp, in6) == 0) { 299 nd6log((LOG_DEBUG, 300 "%s: interface identifier generated by random number\n", 301 if_name(ifp0))); 302 goto success; 303 } 304 305 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 306 return -1; 307 308 success: 309 nd6log((LOG_INFO, "%s: ifid: " 310 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 311 if_name(ifp0), 312 in6->s6_addr[8], in6->s6_addr[9], 313 in6->s6_addr[10], in6->s6_addr[11], 314 in6->s6_addr[12], in6->s6_addr[13], 315 in6->s6_addr[14], in6->s6_addr[15])); 316 return 0; 317 } 318 319 /* 320 * configure IPv6 interface address. XXX code duplicated with in.c 321 */ 322 static int 323 in6_ifattach_addaddr(ifp, ia) 324 struct ifnet *ifp; 325 struct in6_ifaddr *ia; 326 { 327 struct in6_ifaddr *oia; 328 struct ifaddr *ifa; 329 int error; 330 int rtflag; 331 struct in6_addr llsol; 332 333 /* 334 * initialize if_addrlist, if we are the very first one 335 */ 336 ifa = TAILQ_FIRST(&ifp->if_addrlist); 337 if (ifa == NULL) { 338 TAILQ_INIT(&ifp->if_addrlist); 339 } 340 341 /* 342 * link the interface address to global list 343 */ 344 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 345 IFAREF(&ia->ia_ifa); 346 347 /* 348 * Also link into the IPv6 address chain beginning with in6_ifaddr. 349 * kazu opposed it, but itojun & jinmei wanted. 350 */ 351 if ((oia = in6_ifaddr) != NULL) { 352 for (; oia->ia_next; oia = oia->ia_next) 353 continue; 354 oia->ia_next = ia; 355 } else 356 in6_ifaddr = ia; 357 IFAREF(&ia->ia_ifa); 358 359 /* 360 * give the interface a chance to initialize, in case this 361 * is the first address to be added. 362 */ 363 if (ifp->if_ioctl != NULL) { 364 int s; 365 s = splnet(); 366 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 367 splx(s); 368 } else 369 error = 0; 370 if (error) { 371 switch (error) { 372 case EAFNOSUPPORT: 373 printf("%s: IPv6 not supported\n", if_name(ifp)); 374 break; 375 default: 376 printf("%s: SIOCSIFADDR error %d\n", if_name(ifp), 377 error); 378 break; 379 } 380 381 /* undo changes */ 382 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 383 IFAFREE(&ia->ia_ifa); 384 if (oia) 385 oia->ia_next = ia->ia_next; 386 else 387 in6_ifaddr = ia->ia_next; 388 IFAFREE(&ia->ia_ifa); 389 return -1; 390 } 391 392 /* configure link-layer address resolution */ 393 rtflag = 0; 394 if (IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, &in6mask128)) 395 rtflag = RTF_HOST; 396 else { 397 switch (ifp->if_type) { 398 case IFT_LOOP: 399 #ifdef IFT_STF 400 case IFT_STF: 401 #endif 402 rtflag = 0; 403 break; 404 default: 405 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 406 ia->ia_ifa.ifa_flags |= RTF_CLONING; 407 rtflag = RTF_CLONING; 408 break; 409 } 410 } 411 412 /* add route to the interface. */ 413 rtrequest(RTM_ADD, 414 (struct sockaddr *)&ia->ia_addr, 415 (struct sockaddr *)&ia->ia_addr, 416 (struct sockaddr *)&ia->ia_prefixmask, 417 RTF_UP | rtflag, 418 (struct rtentry **)0); 419 ia->ia_flags |= IFA_ROUTE; 420 421 if ((rtflag & RTF_CLONING) != 0 && 422 (ifp->if_flags & IFF_MULTICAST) != 0) { 423 /* Restore saved multicast addresses (if any). */ 424 in6_restoremkludge(ia, ifp); 425 426 /* 427 * join solicited multicast address 428 */ 429 bzero(&llsol, sizeof(llsol)); 430 llsol.s6_addr16[0] = htons(0xff02); 431 llsol.s6_addr16[1] = htons(ifp->if_index); 432 llsol.s6_addr32[1] = 0; 433 llsol.s6_addr32[2] = htonl(1); 434 llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 435 llsol.s6_addr8[12] = 0xff; 436 if (!in6_addmulti(&llsol, ifp, &error)) { 437 nd6log((LOG_ERR, "%s: failed to join %s (errno=%d)\n", 438 if_name(ifp), ip6_sprintf(&llsol), error)); 439 } 440 441 if (in6if_do_dad(ifp)) { 442 /* mark the address TENTATIVE, if needed. */ 443 ia->ia6_flags |= IN6_IFF_TENTATIVE; 444 /* nd6_dad_start() will be called in in6_if_up */ 445 } 446 } 447 448 return 0; 449 } 450 451 static int 452 in6_ifattach_linklocal(ifp, altifp) 453 struct ifnet *ifp; 454 struct ifnet *altifp; /*secondary EUI64 source*/ 455 { 456 struct in6_ifaddr *ia; 457 458 /* 459 * configure link-local address 460 */ 461 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 462 bzero((caddr_t)ia, sizeof(*ia)); 463 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 464 if (ifp->if_flags & IFF_POINTOPOINT) 465 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 466 else 467 ia->ia_ifa.ifa_dstaddr = NULL; 468 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 469 ia->ia_ifp = ifp; 470 471 bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 472 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 473 ia->ia_prefixmask.sin6_family = AF_INET6; 474 ia->ia_prefixmask.sin6_addr = in6mask64; 475 476 /* just in case */ 477 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 478 ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 479 ia->ia_dstaddr.sin6_family = AF_INET6; 480 481 bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 482 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 483 ia->ia_addr.sin6_family = AF_INET6; 484 ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 485 ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 486 ia->ia_addr.sin6_addr.s6_addr32[1] = 0; 487 if (ifp->if_flags & IFF_LOOPBACK) { 488 ia->ia_addr.sin6_addr.s6_addr32[2] = 0; 489 ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); 490 } else { 491 if (get_ifid(ifp, altifp, &ia->ia_addr.sin6_addr) != 0) { 492 nd6log((LOG_ERR, 493 "%s: no ifid available\n", if_name(ifp))); 494 free(ia, M_IFADDR); 495 return -1; 496 } 497 } 498 499 ia->ia_ifa.ifa_metric = ifp->if_metric; 500 501 if (in6_ifattach_addaddr(ifp, ia) != 0) { 502 /* ia will be freed on failure */ 503 return -1; 504 } 505 506 return 0; 507 } 508 509 static int 510 in6_ifattach_loopback(ifp) 511 struct ifnet *ifp; /* must be IFT_LOOP */ 512 { 513 struct in6_ifaddr *ia; 514 515 /* 516 * configure link-local address 517 */ 518 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 519 bzero((caddr_t)ia, sizeof(*ia)); 520 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 521 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 522 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 523 ia->ia_ifp = ifp; 524 525 bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 526 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 527 ia->ia_prefixmask.sin6_family = AF_INET6; 528 ia->ia_prefixmask.sin6_addr = in6mask128; 529 530 /* 531 * Always initialize ia_dstaddr (= broadcast address) to loopback 532 * address, to make getifaddr happier. 533 * 534 * For BSDI, it is mandatory. The BSDI version of 535 * ifa_ifwithroute() rejects to add a route to the loopback 536 * interface. Even for other systems, loopback looks somewhat 537 * special. 538 */ 539 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 540 ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 541 ia->ia_dstaddr.sin6_family = AF_INET6; 542 ia->ia_dstaddr.sin6_addr = in6addr_loopback; 543 544 bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 545 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 546 ia->ia_addr.sin6_family = AF_INET6; 547 ia->ia_addr.sin6_addr = in6addr_loopback; 548 549 ia->ia_ifa.ifa_metric = ifp->if_metric; 550 551 if (in6_ifattach_addaddr(ifp, ia) != 0) { 552 /* ia will be freed on failure */ 553 return -1; 554 } 555 556 return 0; 557 } 558 559 /* 560 * XXX multiple loopback interface needs more care. for instance, 561 * nodelocal address needs to be configured onto only one of them. 562 * XXX multiple link-local address case 563 */ 564 void 565 in6_ifattach(ifp, altifp) 566 struct ifnet *ifp; 567 struct ifnet *altifp; /* secondary EUI64 source */ 568 { 569 struct sockaddr_in6 mltaddr; 570 struct sockaddr_in6 mltmask; 571 struct sockaddr_in6 gate; 572 struct sockaddr_in6 mask; 573 struct in6_ifaddr *ia; 574 struct in6_addr in6; 575 576 /* some of the interfaces are inherently not IPv6 capable */ 577 switch (ifp->if_type) { 578 case IFT_BRIDGE: 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 return; 589 590 /* create a multicast kludge storage (if we have not had one) */ 591 in6_createmkludge(ifp); 592 593 /* 594 * quirks based on interface type 595 */ 596 switch (ifp->if_type) { 597 #ifdef IFT_STF 598 case IFT_STF: 599 /* 600 * 6to4 interface is a very special kind of beast. 601 * no multicast, no linklocal. RFC2529 specifies how to make 602 * linklocals for 6to4 interface, but there's no use and 603 * it is rather harmful to have one. 604 */ 605 return; 606 #endif 607 default: 608 break; 609 } 610 611 /* 612 * usually, we require multicast capability to the interface 613 */ 614 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 615 log(LOG_INFO, "in6_ifattach: " 616 "%s is not multicast capable, IPv6 not enabled\n", 617 if_name(ifp)); 618 return; 619 } 620 621 /* 622 * assign link-local address, if there's none 623 */ 624 ia = in6ifa_ifpforlinklocal(ifp, 0); 625 if (ia == NULL) { 626 if (in6_ifattach_linklocal(ifp, altifp) != 0) 627 return; 628 ia = in6ifa_ifpforlinklocal(ifp, 0); 629 630 if (ia == NULL) { 631 printf("%s: failed to add link-local address\n", 632 if_name(ifp)); 633 634 /* we can't initialize multicasts without link-local */ 635 return; 636 } 637 } 638 639 if (ifp->if_flags & IFF_POINTOPOINT) { 640 /* 641 * route local address to loopback 642 */ 643 bzero(&gate, sizeof(gate)); 644 gate.sin6_len = sizeof(struct sockaddr_in6); 645 gate.sin6_family = AF_INET6; 646 gate.sin6_addr = in6addr_loopback; 647 bzero(&mask, sizeof(mask)); 648 mask.sin6_len = sizeof(struct sockaddr_in6); 649 mask.sin6_family = AF_INET6; 650 mask.sin6_addr = in6mask64; 651 rtrequest(RTM_ADD, 652 (struct sockaddr *)&ia->ia_addr, 653 (struct sockaddr *)&gate, 654 (struct sockaddr *)&mask, 655 RTF_UP|RTF_HOST, 656 (struct rtentry **)0); 657 } 658 659 /* 660 * assign loopback address for loopback interface 661 * XXX multiple loopback interface case 662 */ 663 in6 = in6addr_loopback; 664 if (ifp->if_flags & IFF_LOOPBACK) { 665 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 666 if (in6_ifattach_loopback(ifp) != 0) 667 return; 668 } 669 } 670 671 #ifdef DIAGNOSTIC 672 if (!ia) { 673 panic("ia == NULL in in6_ifattach"); 674 /*NOTREACHED*/ 675 } 676 #endif 677 678 /* 679 * join multicast 680 */ 681 if (ifp->if_flags & IFF_MULTICAST) { 682 int error; /* not used */ 683 struct in6_multi *in6m; 684 685 /* Restore saved multicast addresses (if any). */ 686 in6_restoremkludge(ia, ifp); 687 688 bzero(&mltmask, sizeof(mltmask)); 689 mltmask.sin6_len = sizeof(struct sockaddr_in6); 690 mltmask.sin6_family = AF_INET6; 691 mltmask.sin6_addr = in6mask32; 692 693 /* 694 * join link-local all-nodes address 695 */ 696 bzero(&mltaddr, sizeof(mltaddr)); 697 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 698 mltaddr.sin6_family = AF_INET6; 699 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 700 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 701 702 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 703 if (in6m == NULL) { 704 rtrequest(RTM_ADD, 705 (struct sockaddr *)&mltaddr, 706 (struct sockaddr *)&ia->ia_addr, 707 (struct sockaddr *)&mltmask, 708 RTF_UP|RTF_CLONING, /* xxx */ 709 (struct rtentry **)0); 710 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 711 nd6log((LOG_ERR, "%s: failed to join %s " 712 "(errno=%d)\n", if_name(ifp), 713 ip6_sprintf(&mltaddr.sin6_addr), 714 error)); 715 } 716 } 717 718 if (ifp->if_flags & IFF_LOOPBACK) { 719 in6 = in6addr_loopback; 720 ia = in6ifa_ifpwithaddr(ifp, &in6); 721 /* 722 * join node-local all-nodes address, on loopback 723 */ 724 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 725 726 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 727 if (in6m == NULL && ia != NULL) { 728 rtrequest(RTM_ADD, 729 (struct sockaddr *)&mltaddr, 730 (struct sockaddr *)&ia->ia_addr, 731 (struct sockaddr *)&mltmask, 732 RTF_UP, 733 (struct rtentry **)0); 734 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, 735 &error)) { 736 nd6log((LOG_ERR, "%s: failed to join " 737 "%s (errno=%d)\n", if_name(ifp), 738 ip6_sprintf(&mltaddr.sin6_addr), 739 error)); 740 } 741 } 742 } 743 } 744 } 745 746 /* 747 * NOTE: in6_ifdetach() does not support loopback if at this moment. 748 * We don't need this function in bsdi, because interfaces are never removed 749 * from the ifnet list in bsdi. 750 */ 751 void 752 in6_ifdetach(ifp) 753 struct ifnet *ifp; 754 { 755 struct in6_ifaddr *ia, *oia; 756 struct ifaddr *ifa, *next; 757 struct rtentry *rt; 758 short rtflags; 759 struct sockaddr_in6 sin6; 760 761 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 762 in6_purgeprefix(ifp); 763 764 /* remove neighbor management table */ 765 nd6_purge(ifp); 766 767 /* nuke any of IPv6 addresses we have */ 768 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 769 { 770 next = ifa->ifa_list.tqe_next; 771 if (ifa->ifa_addr->sa_family != AF_INET6) 772 continue; 773 in6_purgeaddr(ifa, ifp); 774 } 775 776 /* undo everything done by in6_ifattach(), just in case */ 777 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 778 { 779 next = ifa->ifa_list.tqe_next; 780 781 782 if (ifa->ifa_addr->sa_family != AF_INET6 783 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 784 continue; 785 } 786 787 ia = (struct in6_ifaddr *)ifa; 788 789 /* remove from the routing table */ 790 if ((ia->ia_flags & IFA_ROUTE) 791 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 792 rtflags = rt->rt_flags; 793 rtfree(rt); 794 rtrequest(RTM_DELETE, 795 (struct sockaddr *)&ia->ia_addr, 796 (struct sockaddr *)&ia->ia_addr, 797 (struct sockaddr *)&ia->ia_prefixmask, 798 rtflags, (struct rtentry **)0); 799 } 800 801 /* remove from the linked list */ 802 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 803 IFAFREE(&ia->ia_ifa); 804 805 /* also remove from the IPv6 address chain(itojun&jinmei) */ 806 oia = ia; 807 if (oia == (ia = in6_ifaddr)) 808 in6_ifaddr = ia->ia_next; 809 else { 810 while (ia->ia_next && (ia->ia_next != oia)) 811 ia = ia->ia_next; 812 if (ia->ia_next) 813 ia->ia_next = oia->ia_next; 814 else { 815 nd6log((LOG_ERR, 816 "%s: didn't unlink in6ifaddr from " 817 "list\n", if_name(ifp))); 818 } 819 } 820 821 IFAFREE(&oia->ia_ifa); 822 } 823 824 /* cleanup multicast address kludge table, if there is any */ 825 in6_purgemkludge(ifp); 826 827 /* 828 * remove neighbor management table. we call it twice just to make 829 * sure we nuke everything. maybe we need just one call. 830 * XXX: since the first call did not release addresses, some prefixes 831 * might remain. We should call nd6_purge() again to release the 832 * prefixes after removing all addresses above. 833 * (Or can we just delay calling nd6_purge until at this point?) 834 */ 835 nd6_purge(ifp); 836 837 /* remove route to link-local allnodes multicast (ff02::1) */ 838 bzero(&sin6, sizeof(sin6)); 839 sin6.sin6_len = sizeof(struct sockaddr_in6); 840 sin6.sin6_family = AF_INET6; 841 sin6.sin6_addr = in6addr_linklocal_allnodes; 842 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 843 rt = rtalloc1((struct sockaddr *)&sin6, 0); 844 if (rt && rt->rt_ifp == ifp) { 845 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 846 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 847 rtfree(rt); 848 } 849 } 850