1 /* $NetBSD: in6_ifattach.c,v 1.65 2006/05/18 09:05:51 liamjfoy 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 1.65 2006/05/18 09:05:51 liamjfoy 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/in6_ifattach.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet6/nd6.h> 57 #include <netinet6/ip6_mroute.h> 58 #include <netinet6/scope6_var.h> 59 60 #include <net/net_osdep.h> 61 62 unsigned long in6_maxmtu = 0; 63 64 int ip6_auto_linklocal = 1; /* enable by default */ 65 66 struct callout in6_tmpaddrtimer_ch = CALLOUT_INITIALIZER; 67 68 69 #if 0 70 static int get_hostid_ifid __P((struct ifnet *, struct in6_addr *)); 71 #endif 72 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 73 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); 74 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 75 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 76 static int in6_ifattach_loopback __P((struct ifnet *)); 77 78 #define EUI64_GBIT 0x01 79 #define EUI64_UBIT 0x02 80 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0) 81 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 82 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 83 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 84 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 85 86 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 87 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 88 89 #define GEN_TEMPID_RETRY_MAX 5 90 91 #if 0 92 /* 93 * Generate a last-resort interface identifier from hostid. 94 * works only for certain architectures (like sparc). 95 * also, using hostid itself may constitute a privacy threat, much worse 96 * than MAC addresses (hostids are used for software licensing). 97 * maybe we should use MD5(hostid) instead. 98 */ 99 static int 100 get_hostid_ifid(ifp, in6) 101 struct ifnet *ifp; 102 struct in6_addr *in6; /* upper 64bits are preserved */ 103 { 104 int off, len; 105 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 106 static const uint8_t allone[8] = 107 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 108 109 if (!hostid) 110 return -1; 111 112 /* get up to 8 bytes from the hostid field - should we get */ 113 len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid); 114 off = sizeof(*in6) - len; 115 memcpy(&in6->s6_addr[off], &hostid, len); 116 117 /* make sure we do not return anything bogus */ 118 if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero))) 119 return -1; 120 if (memcmp(&in6->s6_addr[8], allone, sizeof(allone))) 121 return -1; 122 123 /* make sure to set "u" bit to local, and "g" bit to individual. */ 124 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 125 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 126 127 /* convert EUI64 into IPv6 interface identifier */ 128 EUI64_TO_IFID(in6); 129 130 return 0; 131 } 132 #endif 133 134 /* 135 * Generate a last-resort interface identifier, when the machine has no 136 * IEEE802/EUI64 address sources. 137 * The goal here is to get an interface identifier that is 138 * (1) random enough and (2) does not change across reboot. 139 * We currently use MD5(hostname) for it. 140 */ 141 static int 142 get_rand_ifid(ifp, in6) 143 struct ifnet *ifp; 144 struct in6_addr *in6; /* upper 64bits are preserved */ 145 { 146 MD5_CTX ctxt; 147 u_int8_t digest[16]; 148 149 #if 0 150 /* we need at least several letters as seed for ifid */ 151 if (hostnamelen < 3) 152 return -1; 153 #endif 154 155 /* generate 8 bytes of pseudo-random value. */ 156 memset(&ctxt, 0, sizeof(ctxt)); 157 MD5Init(&ctxt); 158 MD5Update(&ctxt, (u_char *)hostname, hostnamelen); 159 MD5Final(digest, &ctxt); 160 161 /* assumes sizeof(digest) > sizeof(ifid) */ 162 memcpy(&in6->s6_addr[8], digest, 8); 163 164 /* make sure to set "u" bit to local, and "g" bit to individual. */ 165 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 166 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 167 168 /* convert EUI64 into IPv6 interface identifier */ 169 EUI64_TO_IFID(in6); 170 171 return 0; 172 } 173 174 static int 175 generate_tmp_ifid(seed0, seed1, ret) 176 u_int8_t *seed0, *ret; 177 const u_int8_t *seed1; 178 { 179 MD5_CTX ctxt; 180 u_int8_t seed[16], digest[16], nullbuf[8]; 181 u_int32_t val32; 182 /* 183 * interface ID for subnet anycast addresses. 184 * XXX: we assume the unicast address range that requires IDs 185 * in EUI-64 format. 186 */ 187 static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff, 188 0xff, 0xff, 0xff, 0x80 }; 189 static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe }; 190 int badid, retry = 0; 191 192 /* If there's no hisotry, start with a random seed. */ 193 memset(nullbuf, 0, sizeof(nullbuf)); 194 if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 195 int i; 196 197 for (i = 0; i < 2; i++) { 198 val32 = arc4random(); 199 memcpy(seed + sizeof(val32) * i, &val32, sizeof(val32)); 200 } 201 } else 202 memcpy(seed, seed0, 8); 203 204 /* copy the right-most 64-bits of the given address */ 205 /* XXX assumption on the size of IFID */ 206 memcpy(&seed[8], seed1, 8); 207 208 again: 209 /* for debugging purposes only */ 210 #if 0 211 { 212 int i; 213 214 printf("generate_tmp_ifid: new randomized ID from: "); 215 for (i = 0; i < 16; i++) 216 printf("%02x", seed[i]); 217 printf(" "); 218 } 219 #endif 220 221 /* generate 16 bytes of pseudo-random value. */ 222 memset(&ctxt, 0, sizeof(ctxt)); 223 MD5Init(&ctxt); 224 MD5Update(&ctxt, seed, sizeof(seed)); 225 MD5Final(digest, &ctxt); 226 227 /* 228 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3) 229 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 230 * left-most bit is numbered 0) to zero. 231 */ 232 memcpy(ret, digest, 8); 233 ret[0] &= ~EUI64_UBIT; 234 235 /* 236 * Reject inappropriate identifiers according to 237 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4) 238 * At this moment, we reject following cases: 239 * - all 0 identifier 240 * - identifiers that conflict with reserved subnet anycast addresses, 241 * which are defined in RFC 2526. 242 * - identifiers that conflict with ISATAP addresses 243 * - identifiers used in our own addresses 244 */ 245 badid = 0; 246 if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0) 247 badid = 1; 248 else if (memcmp(anycast_id, ret, 7) == 0 && 249 (anycast_id[7] & ret[7]) == anycast_id[7]) { 250 badid = 1; 251 } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0) 252 badid = 1; 253 else { 254 struct in6_ifaddr *ia; 255 256 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 257 if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8], 258 ret, 8)) { 259 badid = 1; 260 break; 261 } 262 } 263 } 264 265 /* 266 * In the event that an unacceptable identifier has been generated, 267 * restart the process, using the right-most 64 bits of the MD5 digest 268 * obtained in place of the history value. 269 */ 270 if (badid) { 271 /* for debugging purposes only */ 272 #if 0 273 { 274 int i; 275 276 printf("unacceptable random ID: "); 277 for (i = 0; i < 16; i++) 278 printf("%02x", digest[i]); 279 printf("\n"); 280 } 281 #endif 282 283 if (++retry < GEN_TEMPID_RETRY_MAX) { 284 memcpy(seed, &digest[8], 8); 285 goto again; 286 } else { 287 /* 288 * We're so unlucky. Give up for now, and return 289 * all 0 IDs to tell the caller not to make a 290 * temporary address. 291 */ 292 nd6log((LOG_NOTICE, 293 "generate_tmp_ifid: never found a good ID\n")); 294 memset(ret, 0, 8); 295 } 296 } 297 298 /* 299 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6) 300 * Take the rightmost 64-bits of the MD5 digest and save them in 301 * stable storage as the history value to be used in the next 302 * iteration of the algorithm. 303 */ 304 memcpy(seed0, &digest[8], 8); 305 306 /* for debugging purposes only */ 307 #if 0 308 { 309 int i; 310 311 printf("to: "); 312 for (i = 0; i < 16; i++) 313 printf("%02x", digest[i]); 314 printf("\n"); 315 } 316 #endif 317 318 return 0; 319 } 320 /* 321 * Get interface identifier for the specified interface. 322 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 323 */ 324 int 325 in6_get_hw_ifid(ifp, in6) 326 struct ifnet *ifp; 327 struct in6_addr *in6; /* upper 64bits are preserved */ 328 { 329 struct ifaddr *ifa; 330 struct sockaddr_dl *sdl; 331 char *addr; 332 size_t addrlen; 333 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 334 static u_int8_t allone[8] = 335 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 336 337 for (ifa = ifp->if_addrlist.tqh_first; 338 ifa; 339 ifa = ifa->ifa_list.tqe_next) 340 { 341 if (ifa->ifa_addr->sa_family != AF_LINK) 342 continue; 343 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 344 if (sdl == NULL) 345 continue; 346 if (sdl->sdl_alen == 0) 347 continue; 348 349 goto found; 350 } 351 352 return -1; 353 354 found: 355 addr = LLADDR(sdl); 356 addrlen = sdl->sdl_alen; 357 358 switch (ifp->if_type) { 359 case IFT_IEEE1394: 360 case IFT_IEEE80211: 361 /* IEEE1394 uses 16byte length address starting with EUI64 */ 362 if (addrlen > 8) 363 addrlen = 8; 364 break; 365 default: 366 break; 367 } 368 369 /* get EUI64 */ 370 switch (ifp->if_type) { 371 /* IEEE802/EUI64 cases - what others? */ 372 case IFT_ETHER: 373 case IFT_FDDI: 374 case IFT_ATM: 375 case IFT_IEEE1394: 376 case IFT_IEEE80211: 377 /* look at IEEE802/EUI64 only */ 378 if (addrlen != 8 && addrlen != 6) 379 return -1; 380 381 /* 382 * check for invalid MAC address - on bsdi, we see it a lot 383 * since wildboar configures all-zero MAC on pccard before 384 * card insertion. 385 */ 386 if (memcmp(addr, allzero, addrlen) == 0) 387 return -1; 388 if (memcmp(addr, allone, addrlen) == 0) 389 return -1; 390 391 /* make EUI64 address */ 392 if (addrlen == 8) 393 memcpy(&in6->s6_addr[8], addr, 8); 394 else if (addrlen == 6) { 395 in6->s6_addr[8] = addr[0]; 396 in6->s6_addr[9] = addr[1]; 397 in6->s6_addr[10] = addr[2]; 398 in6->s6_addr[11] = 0xff; 399 in6->s6_addr[12] = 0xfe; 400 in6->s6_addr[13] = addr[3]; 401 in6->s6_addr[14] = addr[4]; 402 in6->s6_addr[15] = addr[5]; 403 } 404 break; 405 406 case IFT_ARCNET: 407 if (addrlen != 1) 408 return -1; 409 if (!addr[0]) 410 return -1; 411 412 memset(&in6->s6_addr[8], 0, 8); 413 in6->s6_addr[15] = addr[0]; 414 415 /* 416 * due to insufficient bitwidth, we mark it local. 417 */ 418 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 419 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 420 break; 421 422 case IFT_GIF: 423 #ifdef IFT_STF 424 case IFT_STF: 425 #endif 426 /* 427 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 428 * however, IPv4 address is not very suitable as unique 429 * identifier source (can be renumbered). 430 * we don't do this. 431 */ 432 return -1; 433 434 default: 435 return -1; 436 } 437 438 /* sanity check: g bit must not indicate "group" */ 439 if (EUI64_GROUP(in6)) 440 return -1; 441 442 /* convert EUI64 into IPv6 interface identifier */ 443 EUI64_TO_IFID(in6); 444 445 /* 446 * sanity check: ifid must not be all zero, avoid conflict with 447 * subnet router anycast 448 */ 449 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 450 memcmp(&in6->s6_addr[9], allzero, 7) == 0) { 451 return -1; 452 } 453 454 return 0; 455 } 456 457 /* 458 * Get interface identifier for the specified interface. If it is not 459 * available on ifp0, borrow interface identifier from other information 460 * sources. 461 */ 462 static int 463 get_ifid(ifp0, altifp, in6) 464 struct ifnet *ifp0; 465 struct ifnet *altifp; /*secondary EUI64 source*/ 466 struct in6_addr *in6; 467 { 468 struct ifnet *ifp; 469 470 /* first, try to get it from the interface itself */ 471 if (in6_get_hw_ifid(ifp0, in6) == 0) { 472 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 473 if_name(ifp0))); 474 goto success; 475 } 476 477 /* try secondary EUI64 source. this basically is for ATM PVC */ 478 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 479 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 480 if_name(ifp0), if_name(altifp))); 481 goto success; 482 } 483 484 /* next, try to get it from some other hardware interface */ 485 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 486 { 487 if (ifp == ifp0) 488 continue; 489 if (in6_get_hw_ifid(ifp, in6) != 0) 490 continue; 491 492 /* 493 * to borrow ifid from other interface, ifid needs to be 494 * globally unique 495 */ 496 if (IFID_UNIVERSAL(in6)) { 497 nd6log((LOG_DEBUG, 498 "%s: borrow interface identifier from %s\n", 499 if_name(ifp0), if_name(ifp))); 500 goto success; 501 } 502 } 503 504 #if 0 505 /* get from hostid - only for certain architectures */ 506 if (get_hostid_ifid(ifp, in6) == 0) { 507 nd6log((LOG_DEBUG, 508 "%s: interface identifier generated by hostid\n", 509 if_name(ifp0))); 510 goto success; 511 } 512 #endif 513 514 /* last resort: get from random number source */ 515 if (get_rand_ifid(ifp, in6) == 0) { 516 nd6log((LOG_DEBUG, 517 "%s: interface identifier generated by random number\n", 518 if_name(ifp0))); 519 goto success; 520 } 521 522 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 523 return -1; 524 525 success: 526 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 527 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 528 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 529 in6->s6_addr[14], in6->s6_addr[15])); 530 return 0; 531 } 532 533 static int 534 in6_ifattach_linklocal(ifp, altifp) 535 struct ifnet *ifp; 536 struct ifnet *altifp; /*secondary EUI64 source*/ 537 { 538 struct in6_ifaddr *ia; 539 struct in6_aliasreq ifra; 540 struct nd_prefixctl pr0; 541 int i, error; 542 543 /* 544 * configure link-local address. 545 */ 546 memset(&ifra, 0, sizeof(ifra)); 547 548 /* 549 * in6_update_ifa() does not use ifra_name, but we accurately set it 550 * for safety. 551 */ 552 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 553 554 ifra.ifra_addr.sin6_family = AF_INET6; 555 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 556 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 557 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 558 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 559 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 560 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 561 } else { 562 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 563 nd6log((LOG_ERR, 564 "%s: no ifid available\n", if_name(ifp))); 565 return (-1); 566 } 567 } 568 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 569 return (-1); 570 571 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 572 ifra.ifra_prefixmask.sin6_family = AF_INET6; 573 ifra.ifra_prefixmask.sin6_addr = in6mask64; 574 /* link-local addresses should NEVER expire. */ 575 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 576 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 577 578 /* 579 * Now call in6_update_ifa() to do a bunch of procedures to configure 580 * a link-local address. We can set NULL to the 3rd argument, because 581 * we know there's no other link-local address on the interface 582 * and therefore we are adding one (instead of updating one). 583 */ 584 if ((error = in6_update_ifa(ifp, &ifra, NULL, 585 IN6_IFAUPDATE_DADDELAY)) != 0) { 586 /* 587 * XXX: When the interface does not support IPv6, this call 588 * would fail in the SIOCSIFADDR ioctl. I believe the 589 * notification is rather confusing in this case, so just 590 * suppress it. (jinmei@kame.net 20010130) 591 */ 592 if (error != EAFNOSUPPORT) 593 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 594 "configure a link-local address on %s " 595 "(errno=%d)\n", 596 if_name(ifp), error)); 597 return (-1); 598 } 599 600 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 601 #ifdef DIAGNOSTIC 602 if (!ia) { 603 panic("ia == NULL in in6_ifattach_linklocal"); 604 /* NOTREACHED */ 605 } 606 #endif 607 608 /* 609 * Make the link-local prefix (fe80::/64%link) as on-link. 610 * Since we'd like to manage prefixes separately from addresses, 611 * we make an ND6 prefix structure for the link-local prefix, 612 * and add it to the prefix list as a never-expire prefix. 613 * XXX: this change might affect some existing code base... 614 */ 615 memset(&pr0, 0, sizeof(pr0)); 616 pr0.ndpr_ifp = ifp; 617 /* this should be 64 at this moment. */ 618 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 619 pr0.ndpr_prefix = ifra.ifra_addr; 620 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 621 for (i = 0; i < 4; i++) { 622 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 623 in6mask64.s6_addr32[i]; 624 } 625 /* 626 * Initialize parameters. The link-local prefix must always be 627 * on-link, and its lifetimes never expire. 628 */ 629 pr0.ndpr_raf_onlink = 1; 630 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 631 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 632 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 633 /* 634 * Since there is no other link-local addresses, nd6_prefix_lookup() 635 * probably returns NULL. However, we cannot always expect the result. 636 * For example, if we first remove the (only) existing link-local 637 * address, and then reconfigure another one, the prefix is still 638 * valid with referring to the old link-local address. 639 */ 640 if (nd6_prefix_lookup(&pr0) == NULL) { 641 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 642 return (error); 643 } 644 645 return 0; 646 } 647 648 static int 649 in6_ifattach_loopback(ifp) 650 struct ifnet *ifp; /* must be IFT_LOOP */ 651 { 652 struct in6_aliasreq ifra; 653 int error; 654 655 memset(&ifra, 0, sizeof(ifra)); 656 657 /* 658 * in6_update_ifa() does not use ifra_name, but we accurately set it 659 * for safety. 660 */ 661 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 662 663 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 664 ifra.ifra_prefixmask.sin6_family = AF_INET6; 665 ifra.ifra_prefixmask.sin6_addr = in6mask128; 666 667 /* 668 * Always initialize ia_dstaddr (= broadcast address) to loopback 669 * address. Follows IPv4 practice - see in_ifinit(). 670 */ 671 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 672 ifra.ifra_dstaddr.sin6_family = AF_INET6; 673 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 674 675 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 676 ifra.ifra_addr.sin6_family = AF_INET6; 677 ifra.ifra_addr.sin6_addr = in6addr_loopback; 678 679 /* the loopback address should NEVER expire. */ 680 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 681 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 682 683 /* we don't need to perform DAD on loopback interfaces. */ 684 ifra.ifra_flags |= IN6_IFF_NODAD; 685 686 /* 687 * We are sure that this is a newly assigned address, so we can set 688 * NULL to the 3rd arg. 689 */ 690 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 691 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 692 "the loopback address on %s (errno=%d)\n", 693 if_name(ifp), error)); 694 return (-1); 695 } 696 697 return 0; 698 } 699 700 /* 701 * compute NI group address, based on the current hostname setting. 702 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 703 * 704 * when ifp == NULL, the caller is responsible for filling scopeid. 705 */ 706 int 707 in6_nigroup(ifp, name, namelen, sa6) 708 struct ifnet *ifp; 709 const char *name; 710 int namelen; 711 struct sockaddr_in6 *sa6; 712 { 713 const char *p; 714 u_int8_t *q; 715 MD5_CTX ctxt; 716 u_int8_t digest[16]; 717 u_int8_t l; 718 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 719 720 if (!namelen || !name) 721 return -1; 722 723 p = name; 724 while (p && *p && *p != '.' && p - name < namelen) 725 p++; 726 if (p - name > sizeof(n) - 1) 727 return -1; /* label too long */ 728 l = p - name; 729 strncpy((char *)n, name, l); 730 n[(int)l] = '\0'; 731 for (q = n; *q; q++) { 732 if ('A' <= *q && *q <= 'Z') 733 *q = *q - 'A' + 'a'; 734 } 735 736 /* generate 8 bytes of pseudo-random value. */ 737 memset(&ctxt, 0, sizeof(ctxt)); 738 MD5Init(&ctxt); 739 MD5Update(&ctxt, &l, sizeof(l)); 740 MD5Update(&ctxt, n, l); 741 MD5Final(digest, &ctxt); 742 743 memset(sa6, 0, sizeof(*sa6)); 744 sa6->sin6_family = AF_INET6; 745 sa6->sin6_len = sizeof(*sa6); 746 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 747 sa6->sin6_addr.s6_addr8[11] = 2; 748 memcpy(&sa6->sin6_addr.s6_addr32[3], digest, 749 sizeof(sa6->sin6_addr.s6_addr32[3])); 750 if (in6_setscope(&sa6->sin6_addr, ifp, NULL)) 751 return (-1); /* XXX: should not fail */ 752 753 return 0; 754 } 755 756 /* 757 * XXX multiple loopback interface needs more care. for instance, 758 * nodelocal address needs to be configured onto only one of them. 759 * XXX multiple link-local address case 760 */ 761 void 762 in6_ifattach(ifp, altifp) 763 struct ifnet *ifp; 764 struct ifnet *altifp; /* secondary EUI64 source */ 765 { 766 struct in6_ifaddr *ia; 767 struct in6_addr in6; 768 769 /* some of the interfaces are inherently not IPv6 capable */ 770 switch (ifp->if_type) { 771 case IFT_BRIDGE: 772 #ifdef IFT_PFLOG 773 case IFT_PFLOG: 774 #endif 775 #ifdef IFT_PFSYNC 776 case IFT_PFSYNC: 777 #endif 778 return; 779 } 780 781 /* 782 * if link mtu is too small, don't try to configure IPv6. 783 * remember there could be some link-layer that has special 784 * fragmentation logic. 785 */ 786 if (ifp->if_mtu < IPV6_MMTU) { 787 nd6log((LOG_INFO, "in6_ifattach: " 788 "%s has too small MTU, IPv6 not enabled\n", 789 if_name(ifp))); 790 return; 791 } 792 793 /* create a multicast kludge storage (if we have not had one) */ 794 in6_createmkludge(ifp); 795 796 /* 797 * quirks based on interface type 798 */ 799 switch (ifp->if_type) { 800 #ifdef IFT_STF 801 case IFT_STF: 802 /* 803 * 6to4 interface is a very special kind of beast. 804 * no multicast, no linklocal. RFC2529 specifies how to make 805 * linklocals for 6to4 interface, but there's no use and 806 * it is rather harmful to have one. 807 */ 808 return; 809 #endif 810 case IFT_CARP: 811 return; 812 default: 813 break; 814 } 815 816 /* 817 * usually, we require multicast capability to the interface 818 */ 819 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 820 nd6log((LOG_INFO, "in6_ifattach: " 821 "%s is not multicast capable, IPv6 not enabled\n", 822 if_name(ifp))); 823 return; 824 } 825 826 /* 827 * assign loopback address for loopback interface. 828 * XXX multiple loopback interface case. 829 */ 830 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 831 in6 = in6addr_loopback; 832 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 833 if (in6_ifattach_loopback(ifp) != 0) 834 return; 835 } 836 } 837 838 /* 839 * assign a link-local address, if there's none. 840 */ 841 if (ip6_auto_linklocal) { 842 ia = in6ifa_ifpforlinklocal(ifp, 0); 843 if (ia == NULL) { 844 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 845 /* linklocal address assigned */ 846 } else { 847 /* failed to assign linklocal address. bark? */ 848 } 849 } 850 } 851 } 852 853 /* 854 * NOTE: in6_ifdetach() does not support loopback if at this moment. 855 * We don't need this function in bsdi, because interfaces are never removed 856 * from the ifnet list in bsdi. 857 */ 858 void 859 in6_ifdetach(ifp) 860 struct ifnet *ifp; 861 { 862 struct in6_ifaddr *ia, *oia; 863 struct ifaddr *ifa, *next; 864 struct rtentry *rt; 865 short rtflags; 866 struct in6_multi_mship *imm; 867 868 /* remove ip6_mrouter stuff */ 869 ip6_mrouter_detach(ifp); 870 871 /* remove neighbor management table */ 872 nd6_purge(ifp); 873 874 /* nuke any of IPv6 addresses we have */ 875 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 876 { 877 next = ifa->ifa_list.tqe_next; 878 if (ifa->ifa_addr->sa_family != AF_INET6) 879 continue; 880 in6_purgeaddr(ifa); 881 } 882 883 /* undo everything done by in6_ifattach(), just in case */ 884 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 885 { 886 next = ifa->ifa_list.tqe_next; 887 888 if (ifa->ifa_addr->sa_family != AF_INET6 889 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 890 continue; 891 } 892 893 ia = (struct in6_ifaddr *)ifa; 894 895 /* 896 * leave from multicast groups we have joined for the interface 897 */ 898 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 899 LIST_REMOVE(imm, i6mm_chain); 900 in6_leavegroup(imm); 901 } 902 903 /* remove from the routing table */ 904 if ((ia->ia_flags & IFA_ROUTE) && 905 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 906 rtflags = rt->rt_flags; 907 rtfree(rt); 908 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 909 (struct sockaddr *)&ia->ia_addr, 910 (struct sockaddr *)&ia->ia_prefixmask, 911 rtflags, (struct rtentry **)0); 912 } 913 914 /* remove from the linked list */ 915 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 916 IFAFREE(&ia->ia_ifa); 917 918 /* also remove from the IPv6 address chain(itojun&jinmei) */ 919 oia = ia; 920 if (oia == (ia = in6_ifaddr)) 921 in6_ifaddr = ia->ia_next; 922 else { 923 while (ia->ia_next && (ia->ia_next != oia)) 924 ia = ia->ia_next; 925 if (ia->ia_next) 926 ia->ia_next = oia->ia_next; 927 else { 928 nd6log((LOG_ERR, 929 "%s: didn't unlink in6ifaddr from list\n", 930 if_name(ifp))); 931 } 932 } 933 934 IFAFREE(&oia->ia_ifa); 935 } 936 937 /* cleanup multicast address kludge table, if there is any */ 938 in6_purgemkludge(ifp); 939 940 /* 941 * remove neighbor management table. we call it twice just to make 942 * sure we nuke everything. maybe we need just one call. 943 * XXX: since the first call did not release addresses, some prefixes 944 * might remain. We should call nd6_purge() again to release the 945 * prefixes after removing all addresses above. 946 * (Or can we just delay calling nd6_purge until at this point?) 947 */ 948 nd6_purge(ifp); 949 } 950 951 int 952 in6_get_tmpifid(ifp, retbuf, baseid, generate) 953 struct ifnet *ifp; 954 u_int8_t *retbuf; 955 const u_int8_t *baseid; 956 int generate; 957 { 958 u_int8_t nullbuf[8]; 959 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 960 961 memset(nullbuf, 0, sizeof(nullbuf)); 962 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 963 /* we've never created a random ID. Create a new one. */ 964 generate = 1; 965 } 966 967 if (generate) { 968 memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1)); 969 970 /* generate_tmp_ifid will update seedn and buf */ 971 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 972 ndi->randomid); 973 } 974 memcpy(retbuf, ndi->randomid, 8); 975 if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) { 976 /* generate_tmp_ifid could not found a good ID. */ 977 return (-1); 978 } 979 980 return (0); 981 } 982 983 void 984 in6_tmpaddrtimer(ignored_arg) 985 void *ignored_arg; 986 { 987 struct nd_ifinfo *ndi; 988 u_int8_t nullbuf[8]; 989 struct ifnet *ifp; 990 int s = splsoftnet(); 991 992 callout_reset(&in6_tmpaddrtimer_ch, 993 (ip6_temp_preferred_lifetime - ip6_desync_factor - 994 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 995 996 memset(nullbuf, 0, sizeof(nullbuf)); 997 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 998 ndi = ND_IFINFO(ifp); 999 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1000 /* 1001 * We've been generating a random ID on this interface. 1002 * Create a new one. 1003 */ 1004 (void)generate_tmp_ifid(ndi->randomseed0, 1005 ndi->randomseed1, ndi->randomid); 1006 } 1007 } 1008 1009 splx(s); 1010 } 1011