in6_ifattach.c revision 1.25
1/* $OpenBSD: in6_ifattach.c,v 1.25 2002/05/29 07:54:59 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/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#include <sys/md5k.h> 41 42#include <net/if.h> 43#include <net/if_dl.h> 44#include <net/if_types.h> 45#include <net/route.h> 46 47#include <netinet/in.h> 48#include <netinet/in_var.h> 49#include <netinet/if_ether.h> 50 51#include <netinet/ip6.h> 52#include <netinet6/ip6_var.h> 53#include <netinet6/in6_ifattach.h> 54#include <netinet6/ip6_var.h> 55#include <netinet6/nd6.h> 56 57unsigned long in6_maxmtu = 0; 58 59static int get_rand_ifid(struct ifnet *, struct in6_addr *); 60static int get_hw_ifid(struct ifnet *, struct in6_addr *); 61static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 62static int in6_ifattach_addaddr(struct ifnet *, struct in6_ifaddr *); 63static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 64static int in6_ifattach_loopback(struct ifnet *); 65 66#define EUI64_GBIT 0x01 67#define EUI64_UBIT 0x02 68#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 69#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 70#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 71#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 72#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 73 74#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 75#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 76 77/* 78 * Generate a last-resort interface identifier, when the machine has no 79 * IEEE802/EUI64 address sources. 80 * The goal here is to get an interface identifier that is 81 * (1) random enough and (2) does not change across reboot. 82 * We currently use MD5(hostname) for it. 83 */ 84static int 85get_rand_ifid(ifp, in6) 86 struct ifnet *ifp; 87 struct in6_addr *in6; /* upper 64bits are preserved */ 88{ 89 MD5_CTX ctxt; 90 u_int8_t digest[16]; 91 92#if 0 93 /* we need at least several letters as seed for ifid */ 94 if (hostnamelen < 3) 95 return -1; 96#endif 97 98 /* generate 8 bytes of pseudo-random value. */ 99 bzero(&ctxt, sizeof(ctxt)); 100 MD5Init(&ctxt); 101 MD5Update(&ctxt, hostname, hostnamelen); 102 MD5Final(digest, &ctxt); 103 104 /* assumes sizeof(digest) > sizeof(ifid) */ 105 bcopy(digest, &in6->s6_addr[8], 8); 106 107 /* make sure to set "u" bit to local, and "g" bit to individual. */ 108 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 109 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 110 111 /* convert EUI64 into IPv6 interface identifier */ 112 EUI64_TO_IFID(in6); 113 114 return 0; 115} 116 117/* 118 * Get interface identifier for the specified interface. 119 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 120 */ 121static int 122get_hw_ifid(ifp, in6) 123 struct ifnet *ifp; 124 struct in6_addr *in6; /* upper 64bits are preserved */ 125{ 126 struct ifaddr *ifa; 127 struct sockaddr_dl *sdl; 128 u_int8_t *addr; 129 size_t addrlen; 130 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 131 static u_int8_t allone[8] = 132 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 133 134 for (ifa = ifp->if_addrlist.tqh_first; 135 ifa; 136 ifa = ifa->ifa_list.tqe_next) 137 { 138 if (ifa->ifa_addr->sa_family != AF_LINK) 139 continue; 140 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 141 if (sdl == NULL) 142 continue; 143 if (sdl->sdl_alen == 0) 144 continue; 145 146 goto found; 147 } 148 149 return -1; 150 151found: 152 addr = LLADDR(sdl); 153 addrlen = sdl->sdl_alen; 154 155 /* get EUI64 */ 156 switch (ifp->if_type) { 157 case IFT_ETHER: 158 case IFT_FDDI: 159 case IFT_ATM: 160 /* IEEE802/EUI64 cases - what others? */ 161 162 /* look at IEEE802/EUI64 only */ 163 if (addrlen != 8 && addrlen != 6) 164 return -1; 165 166 /* 167 * check for invalid MAC address - on bsdi, we see it a lot 168 * since wildboar configures all-zero MAC on pccard before 169 * card insertion. 170 */ 171 if (bcmp(addr, allzero, addrlen) == 0) 172 return -1; 173 if (bcmp(addr, allone, addrlen) == 0) 174 return -1; 175 176 /* make EUI64 address */ 177 if (addrlen == 8) 178 bcopy(addr, &in6->s6_addr[8], 8); 179 else if (addrlen == 6) { 180 in6->s6_addr[8] = addr[0]; 181 in6->s6_addr[9] = addr[1]; 182 in6->s6_addr[10] = addr[2]; 183 in6->s6_addr[11] = 0xff; 184 in6->s6_addr[12] = 0xfe; 185 in6->s6_addr[13] = addr[3]; 186 in6->s6_addr[14] = addr[4]; 187 in6->s6_addr[15] = addr[5]; 188 } 189 break; 190 191 case IFT_ARCNET: 192 if (addrlen != 1) 193 return -1; 194 if (!addr[0]) 195 return -1; 196 197 bzero(&in6->s6_addr[8], 8); 198 in6->s6_addr[15] = addr[0]; 199 200 /* 201 * due to insufficient bitwidth, we mark it local. 202 */ 203 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 204 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 205 break; 206 207 case IFT_GIF: 208#ifdef IFT_STF 209 case IFT_STF: 210#endif 211 /* 212 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 213 * however, IPv4 address is not very suitable as unique 214 * identifier source (can be renumbered). 215 * we don't do this. 216 */ 217 return -1; 218 219 default: 220 return -1; 221 } 222 223 /* sanity check: g bit must not indicate "group" */ 224 if (EUI64_GROUP(in6)) 225 return -1; 226 227 /* convert EUI64 into IPv6 interface identifier */ 228 EUI64_TO_IFID(in6); 229 230 /* 231 * sanity check: ifid must not be all zero, avoid conflict with 232 * subnet router anycast 233 */ 234 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 235 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 236 return -1; 237 } 238 239 return 0; 240} 241 242/* 243 * Get interface identifier for the specified interface. If it is not 244 * available on ifp0, borrow interface identifier from other information 245 * sources. 246 */ 247static int 248get_ifid(ifp0, altifp, in6) 249 struct ifnet *ifp0; 250 struct ifnet *altifp; /* secondary EUI64 source */ 251 struct in6_addr *in6; 252{ 253 struct ifnet *ifp; 254 255 /* first, try to get it from the interface itself */ 256 if (get_hw_ifid(ifp0, in6) == 0) { 257 nd6log((LOG_DEBUG, 258 "%s: got interface identifier from itself\n", 259 ifp0->if_xname)); 260 goto success; 261 } 262 263 /* try secondary EUI64 source. this basically is for ATM PVC */ 264 if (altifp && get_hw_ifid(altifp, in6) == 0) { 265 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 266 ifp0->if_xname, altifp->if_xname)); 267 goto success; 268 } 269 270 /* next, try to get it from some other hardware interface */ 271 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 272 { 273 if (ifp == ifp0) 274 continue; 275 if (get_hw_ifid(ifp, in6) != 0) 276 continue; 277 278 /* 279 * to borrow ifid from other interface, ifid needs to be 280 * globally unique 281 */ 282 if (IFID_UNIVERSAL(in6)) { 283 nd6log((LOG_DEBUG, 284 "%s: borrow interface identifier from %s\n", 285 ifp0->if_xname, ifp->if_xname)); 286 goto success; 287 } 288 } 289 290 /* last resort: get from random number source */ 291 if (get_rand_ifid(ifp, in6) == 0) { 292 nd6log((LOG_DEBUG, 293 "%s: interface identifier generated by random number\n", 294 ifp0->if_xname)); 295 goto success; 296 } 297 298 printf("%s: failed to get interface identifier\n", ifp0->if_xname); 299 return -1; 300 301success: 302 nd6log((LOG_INFO, "%s: ifid: " 303 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 304 ifp0->if_xname, 305 in6->s6_addr[8], in6->s6_addr[9], 306 in6->s6_addr[10], in6->s6_addr[11], 307 in6->s6_addr[12], in6->s6_addr[13], 308 in6->s6_addr[14], in6->s6_addr[15])); 309 return 0; 310} 311 312/* 313 * configure IPv6 interface address. XXX code duplicated with in.c 314 */ 315static int 316in6_ifattach_addaddr(ifp, ia) 317 struct ifnet *ifp; 318 struct in6_ifaddr *ia; 319{ 320 struct in6_ifaddr *oia; 321 struct ifaddr *ifa; 322 int error; 323 int rtflag; 324 struct in6_addr llsol; 325 326 /* 327 * initialize if_addrlist, if we are the very first one 328 */ 329 ifa = TAILQ_FIRST(&ifp->if_addrlist); 330 if (ifa == NULL) { 331 TAILQ_INIT(&ifp->if_addrlist); 332 } 333 334 /* 335 * link the interface address to global list 336 */ 337 TAILQ_INSERT_TAIL(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 338 ia->ia_ifa.ifa_refcnt++; 339 340 /* 341 * Also link into the IPv6 address chain beginning with in6_ifaddr. 342 * kazu opposed it, but itojun & jinmei wanted. 343 */ 344 if ((oia = in6_ifaddr) != NULL) { 345 for (; oia->ia_next; oia = oia->ia_next) 346 continue; 347 oia->ia_next = ia; 348 } else 349 in6_ifaddr = ia; 350 ia->ia_ifa.ifa_refcnt++; 351 352 /* 353 * give the interface a chance to initialize, in case this 354 * is the first address to be added. 355 */ 356 if (ifp->if_ioctl != NULL) { 357 int s; 358 s = splimp(); 359 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia); 360 splx(s); 361 } else 362 error = 0; 363 if (error) { 364 switch (error) { 365 case EAFNOSUPPORT: 366 printf("%s: IPv6 not supported\n", ifp->if_xname); 367 break; 368 default: 369 printf("%s: SIOCSIFADDR error %d\n", ifp->if_xname, 370 error); 371 break; 372 } 373 374 /* undo changes */ 375 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 376 IFAFREE(&ia->ia_ifa); 377 if (oia) 378 oia->ia_next = ia->ia_next; 379 else 380 in6_ifaddr = ia->ia_next; 381 IFAFREE(&ia->ia_ifa); 382 return -1; 383 } 384 385 /* configure link-layer address resolution */ 386 rtflag = 0; 387 if (IN6_ARE_ADDR_EQUAL(&ia->ia_prefixmask.sin6_addr, &in6mask128)) 388 rtflag = RTF_HOST; 389 else { 390 switch (ifp->if_type) { 391 case IFT_LOOP: 392#ifdef IFT_STF 393 case IFT_STF: 394#endif 395 rtflag = 0; 396 break; 397 default: 398 ia->ia_ifa.ifa_rtrequest = nd6_rtrequest; 399 ia->ia_ifa.ifa_flags |= RTF_CLONING; 400 rtflag = RTF_CLONING; 401 break; 402 } 403 } 404 405 /* add route to the interface. */ 406 rtrequest(RTM_ADD, 407 (struct sockaddr *)&ia->ia_addr, 408 (struct sockaddr *)&ia->ia_addr, 409 (struct sockaddr *)&ia->ia_prefixmask, 410 RTF_UP | rtflag, 411 (struct rtentry **)0); 412 ia->ia_flags |= IFA_ROUTE; 413 414 if ((rtflag & RTF_CLONING) != 0 && 415 (ifp->if_flags & IFF_MULTICAST) != 0) { 416 /* Restore saved multicast addresses (if any). */ 417 in6_restoremkludge(ia, ifp); 418 419 /* 420 * join solicited multicast address 421 */ 422 bzero(&llsol, sizeof(llsol)); 423 llsol.s6_addr16[0] = htons(0xff02); 424 llsol.s6_addr16[1] = htons(ifp->if_index); 425 llsol.s6_addr32[1] = 0; 426 llsol.s6_addr32[2] = htonl(1); 427 llsol.s6_addr32[3] = ia->ia_addr.sin6_addr.s6_addr32[3]; 428 llsol.s6_addr8[12] = 0xff; 429 (void)in6_addmulti(&llsol, ifp, &error); 430 431 /* XXX should we run DAD on other interface types? */ 432 if (in6if_do_dad(ifp)) { 433 /* mark the address TENTATIVE, if needed. */ 434 ia->ia6_flags |= IN6_IFF_TENTATIVE; 435 /* nd6_dad_start() will be called in in6_if_up */ 436 } 437 } 438 439 return 0; 440} 441 442static int 443in6_ifattach_linklocal(ifp, altifp) 444 struct ifnet *ifp; 445 struct ifnet *altifp; /*secondary EUI64 source*/ 446{ 447 struct in6_ifaddr *ia; 448 449 /* 450 * configure link-local address 451 */ 452 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 453 bzero((caddr_t)ia, sizeof(*ia)); 454 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 455 if (ifp->if_flags & IFF_POINTOPOINT) 456 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 457 else 458 ia->ia_ifa.ifa_dstaddr = NULL; 459 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 460 ia->ia_ifp = ifp; 461 462 bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 463 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 464 ia->ia_prefixmask.sin6_family = AF_INET6; 465 ia->ia_prefixmask.sin6_addr = in6mask64; 466 467 /* just in case */ 468 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 469 ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 470 ia->ia_dstaddr.sin6_family = AF_INET6; 471 472 bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 473 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 474 ia->ia_addr.sin6_family = AF_INET6; 475 ia->ia_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 476 ia->ia_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 477 ia->ia_addr.sin6_addr.s6_addr32[1] = 0; 478 if (ifp->if_flags & IFF_LOOPBACK) { 479 ia->ia_addr.sin6_addr.s6_addr32[2] = 0; 480 ia->ia_addr.sin6_addr.s6_addr32[3] = htonl(1); 481 } else { 482 if (get_ifid(ifp, altifp, &ia->ia_addr.sin6_addr) != 0) { 483 nd6log((LOG_ERR, 484 "%s: no ifid available\n", ifp->if_xname)); 485 free(ia, M_IFADDR); 486 return -1; 487 } 488 } 489 490 ia->ia_ifa.ifa_metric = ifp->if_metric; 491 492 if (in6_ifattach_addaddr(ifp, ia) != 0) { 493 /* ia will be freed on failure */ 494 return -1; 495 } 496 497 return 0; 498} 499 500static int 501in6_ifattach_loopback(ifp) 502 struct ifnet *ifp; /* must be IFT_LOOP */ 503{ 504 struct in6_ifaddr *ia; 505 506 /* 507 * configure link-local address 508 */ 509 ia = (struct in6_ifaddr *)malloc(sizeof(*ia), M_IFADDR, M_WAITOK); 510 bzero((caddr_t)ia, sizeof(*ia)); 511 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr; 512 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr; 513 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask; 514 ia->ia_ifp = ifp; 515 516 bzero(&ia->ia_prefixmask, sizeof(ia->ia_prefixmask)); 517 ia->ia_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 518 ia->ia_prefixmask.sin6_family = AF_INET6; 519 ia->ia_prefixmask.sin6_addr = in6mask128; 520 521 /* 522 * Always initialize ia_dstaddr (= broadcast address) to loopback 523 * address, to make getifaddr happier. 524 * 525 * For BSDI, it is mandatory. The BSDI version of 526 * ifa_ifwithroute() rejects to add a route to the loopback 527 * interface. Even for other systems, loopback looks somewhat 528 * special. 529 */ 530 bzero(&ia->ia_dstaddr, sizeof(ia->ia_dstaddr)); 531 ia->ia_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 532 ia->ia_dstaddr.sin6_family = AF_INET6; 533 ia->ia_dstaddr.sin6_addr = in6addr_loopback; 534 535 bzero(&ia->ia_addr, sizeof(ia->ia_addr)); 536 ia->ia_addr.sin6_len = sizeof(struct sockaddr_in6); 537 ia->ia_addr.sin6_family = AF_INET6; 538 ia->ia_addr.sin6_addr = in6addr_loopback; 539 540 ia->ia_ifa.ifa_metric = ifp->if_metric; 541 542 if (in6_ifattach_addaddr(ifp, ia) != 0) { 543 /* ia will be freed on failure */ 544 return -1; 545 } 546 547 return 0; 548} 549 550/* 551 * XXX multiple loopback interface needs more care. for instance, 552 * nodelocal address needs to be configured onto only one of them. 553 * XXX multiple link-local address case 554 */ 555void 556in6_ifattach(ifp, altifp) 557 struct ifnet *ifp; 558 struct ifnet *altifp; /* secondary EUI64 source */ 559{ 560 struct sockaddr_in6 mltaddr; 561 struct sockaddr_in6 mltmask; 562 struct sockaddr_in6 gate; 563 struct sockaddr_in6 mask; 564 struct in6_ifaddr *ia; 565 struct in6_addr in6; 566 567 /* some of the interfaces are inherently not IPv6 capable */ 568 switch (ifp->if_type) { 569 case IFT_BRIDGE: 570 case IFT_ENC: 571 case IFT_PFLOG: 572 return; 573 case IFT_PROPVIRTUAL: 574 if (strncmp("bridge", ifp->if_xname, sizeof("bridge")) == 0 && 575 '0' <= ifp->if_xname[sizeof("bridge")] && 576 ifp->if_xname[sizeof("bridge")] <= '9') 577 return; 578 break; 579 } 580 581 /* 582 * if link mtu is too small, don't try to configure IPv6. 583 * remember there could be some link-layer that has special 584 * fragmentation logic. 585 */ 586 if (ifp->if_mtu < IPV6_MMTU) 587 return; 588 589 /* create a multicast kludge storage (if we have not had one) */ 590 in6_createmkludge(ifp); 591 592 /* 593 * quirks based on interface type 594 */ 595 switch (ifp->if_type) { 596#ifdef IFT_STF 597 case IFT_STF: 598 /* 599 * 6to4 interface is a very special kind of beast. 600 * no multicast, no linklocal. RFC2529 specifies how to make 601 * linklocals for 6to4 interface, but there's no use and 602 * it is rather harmful to have one. 603 */ 604 return; 605#endif 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 log(LOG_INFO, "in6_ifattach: " 615 "%s is not multicast capable, IPv6 not enabled\n", 616 ifp->if_xname); 617 return; 618 } 619 620 /* 621 * assign link-local address, if there's none 622 */ 623 ia = in6ifa_ifpforlinklocal(ifp, 0); 624 if (ia == NULL) { 625 if (in6_ifattach_linklocal(ifp, altifp) != 0) 626 return; 627 ia = in6ifa_ifpforlinklocal(ifp, 0); 628 629 if (ia == NULL) { 630 printf("%s: failed to add link-local address\n", 631 ifp->if_xname); 632 633 /* we can't initialize multicasts without link-local */ 634 return; 635 } 636 } 637 638 if (ifp->if_flags & IFF_POINTOPOINT) { 639 /* 640 * route local address to loopback 641 */ 642 bzero(&gate, sizeof(gate)); 643 gate.sin6_len = sizeof(struct sockaddr_in6); 644 gate.sin6_family = AF_INET6; 645 gate.sin6_addr = in6addr_loopback; 646 bzero(&mask, sizeof(mask)); 647 mask.sin6_len = sizeof(struct sockaddr_in6); 648 mask.sin6_family = AF_INET6; 649 mask.sin6_addr = in6mask64; 650 rtrequest(RTM_ADD, 651 (struct sockaddr *)&ia->ia_addr, 652 (struct sockaddr *)&gate, 653 (struct sockaddr *)&mask, 654 RTF_UP|RTF_HOST, 655 (struct rtentry **)0); 656 } 657 658 /* 659 * assign loopback address for loopback interface 660 * XXX multiple loopback interface case 661 */ 662 in6 = in6addr_loopback; 663 if (ifp->if_flags & IFF_LOOPBACK) { 664 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 665 if (in6_ifattach_loopback(ifp) != 0) 666 return; 667 } 668 } 669 670#ifdef DIAGNOSTIC 671 if (!ia) { 672 panic("ia == NULL in in6_ifattach"); 673 /*NOTREACHED*/ 674 } 675#endif 676 677 /* 678 * join multicast 679 */ 680 if (ifp->if_flags & IFF_MULTICAST) { 681 int error; /* not used */ 682 struct in6_multi *in6m; 683 684 /* Restore saved multicast addresses(if any). */ 685 in6_restoremkludge(ia, ifp); 686 687 bzero(&mltmask, sizeof(mltmask)); 688 mltmask.sin6_len = sizeof(struct sockaddr_in6); 689 mltmask.sin6_family = AF_INET6; 690 mltmask.sin6_addr = in6mask32; 691 692 /* 693 * join link-local all-nodes address 694 */ 695 bzero(&mltaddr, sizeof(mltaddr)); 696 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 697 mltaddr.sin6_family = AF_INET6; 698 mltaddr.sin6_addr = in6addr_linklocal_allnodes; 699 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 700 701 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 702 if (in6m == NULL) { 703 rtrequest(RTM_ADD, 704 (struct sockaddr *)&mltaddr, 705 (struct sockaddr *)&ia->ia_addr, 706 (struct sockaddr *)&mltmask, 707 RTF_UP|RTF_CLONING, /* xxx */ 708 (struct rtentry **)0); 709 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 710 } 711 712 if (ifp->if_flags & IFF_LOOPBACK) { 713 in6 = in6addr_loopback; 714 ia = in6ifa_ifpwithaddr(ifp, &in6); 715 /* 716 * join node-local all-nodes address, on loopback 717 */ 718 mltaddr.sin6_addr = in6addr_nodelocal_allnodes; 719 720 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 721 if (in6m == NULL && ia != NULL) { 722 rtrequest(RTM_ADD, 723 (struct sockaddr *)&mltaddr, 724 (struct sockaddr *)&ia->ia_addr, 725 (struct sockaddr *)&mltmask, 726 RTF_UP, 727 (struct rtentry **)0); 728 (void)in6_addmulti(&mltaddr.sin6_addr, ifp, &error); 729 } 730 } 731 } 732} 733 734/* 735 * NOTE: in6_ifdetach() does not support loopback if at this moment. 736 */ 737void 738in6_ifdetach(ifp) 739 struct ifnet *ifp; 740{ 741 struct in6_ifaddr *ia, *oia; 742 struct ifaddr *ifa, *next; 743 struct rtentry *rt; 744 short rtflags; 745 struct sockaddr_in6 sin6; 746 struct in6_multi *in6m; 747 748 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 749 in6_purgeprefix(ifp); 750 751 /* remove neighbor management table */ 752 nd6_purge(ifp); 753 754 /* nuke any of IPv6 addresses we have */ 755 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 756 { 757 next = ifa->ifa_list.tqe_next; 758 if (ifa->ifa_addr->sa_family != AF_INET6) 759 continue; 760 in6_purgeaddr(ifa, ifp); 761 } 762 763 /* undo everything done by in6_ifattach(), just in case */ 764 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 765 { 766 if (ifa->ifa_addr->sa_family != AF_INET6 767 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 768 continue; 769 } 770 771 ia = (struct in6_ifaddr *)ifa; 772 773 /* leave from all multicast groups joined */ 774 while ((in6m = LIST_FIRST(&ia->ia6_multiaddrs)) != NULL) 775 in6_delmulti(in6m); 776 777 /* remove from the routing table */ 778 if ((ia->ia_flags & IFA_ROUTE) 779 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 780 rtflags = rt->rt_flags; 781 rtfree(rt); 782 rtrequest(RTM_DELETE, 783 (struct sockaddr *)&ia->ia_addr, 784 (struct sockaddr *)&ia->ia_addr, 785 (struct sockaddr *)&ia->ia_prefixmask, 786 rtflags, (struct rtentry **)0); 787 } 788 789 /* remove from the linked list */ 790 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 791 IFAFREE(&ia->ia_ifa); 792 793 /* also remove from the IPv6 address chain(itojun&jinmei) */ 794 oia = ia; 795 if (oia == (ia = in6_ifaddr)) 796 in6_ifaddr = ia->ia_next; 797 else { 798 while (ia->ia_next && (ia->ia_next != oia)) 799 ia = ia->ia_next; 800 if (ia->ia_next) 801 ia->ia_next = oia->ia_next; 802 else { 803 nd6log((LOG_ERR, 804 "%s: didn't unlink in6ifaddr from " 805 "list\n", ifp->if_xname)); 806 } 807 } 808 809 IFAFREE(&oia->ia_ifa); 810 } 811 812 /* cleanup multicast address kludge table, if there is any */ 813 in6_purgemkludge(ifp); 814 815 /* 816 * remove neighbor management table. we call it twice just to make 817 * sure we nuke everything. maybe we need just one call. 818 * XXX: since the first call did not release addresses, some prefixes 819 * might remain. We should call nd6_purge() again to release the 820 * prefixes after removing all addresses above. 821 * (Or can we just delay calling nd6_purge until at this point?) 822 */ 823 nd6_purge(ifp); 824 825 /* remove route to link-local allnodes multicast (ff02::1) */ 826 bzero(&sin6, sizeof(sin6)); 827 sin6.sin6_len = sizeof(struct sockaddr_in6); 828 sin6.sin6_family = AF_INET6; 829 sin6.sin6_addr = in6addr_linklocal_allnodes; 830 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 831 rt = rtalloc1((struct sockaddr *)&sin6, 0); 832 if (rt && rt->rt_ifp == ifp) { 833 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 834 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 835 rtfree(rt); 836 } 837} 838