1 /* $NetBSD: in6_ifattach.c,v 1.91 2014/06/05 16:06:49 roy 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 1.91 2014/06/05 16:06:49 roy Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kmem.h> 39 #include <sys/malloc.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/kernel.h> 43 #include <sys/syslog.h> 44 #include <sys/md5.h> 45 #include <sys/socketvar.h> 46 #include <sys/cprng.h> 47 48 #include <net/if.h> 49 #include <net/if_dl.h> 50 #include <net/if_types.h> 51 #include <net/route.h> 52 53 #include <netinet/in.h> 54 #include <netinet/in_var.h> 55 56 #include <netinet/ip6.h> 57 #include <netinet6/in6_ifattach.h> 58 #include <netinet6/ip6_var.h> 59 #include <netinet6/nd6.h> 60 #include <netinet6/ip6_mroute.h> 61 #include <netinet6/scope6_var.h> 62 63 #include <net/net_osdep.h> 64 65 unsigned long in6_maxmtu = 0; 66 67 int ip6_auto_linklocal = 1; /* enable by default */ 68 69 callout_t in6_tmpaddrtimer_ch; 70 71 72 #if 0 73 static int get_hostid_ifid(struct ifnet *, struct in6_addr *); 74 #endif 75 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 76 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 77 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 78 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 79 static int in6_ifattach_loopback(struct ifnet *); 80 81 #define EUI64_GBIT 0x01 82 #define EUI64_UBIT 0x02 83 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (/*CONSTCOND*/ 0) 84 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 85 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 86 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 87 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 88 89 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 90 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 91 92 #define GEN_TEMPID_RETRY_MAX 5 93 94 #if 0 95 /* 96 * Generate a last-resort interface identifier from hostid. 97 * works only for certain architectures (like sparc). 98 * also, using hostid itself may constitute a privacy threat, much worse 99 * than MAC addresses (hostids are used for software licensing). 100 * maybe we should use MD5(hostid) instead. 101 * 102 * in6 - upper 64bits are preserved 103 */ 104 static int 105 get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6) 106 { 107 int off, len; 108 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 109 static const uint8_t allone[8] = 110 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 111 112 if (!hostid) 113 return -1; 114 115 /* get up to 8 bytes from the hostid field - should we get */ 116 len = (sizeof(hostid) > 8) ? 8 : sizeof(hostid); 117 off = sizeof(*in6) - len; 118 memcpy(&in6->s6_addr[off], &hostid, len); 119 120 /* make sure we do not return anything bogus */ 121 if (memcmp(&in6->s6_addr[8], allzero, sizeof(allzero))) 122 return -1; 123 if (memcmp(&in6->s6_addr[8], allone, sizeof(allone))) 124 return -1; 125 126 /* make sure to set "u" bit to local, and "g" bit to individual. */ 127 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 128 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 129 130 /* convert EUI64 into IPv6 interface identifier */ 131 EUI64_TO_IFID(in6); 132 133 return 0; 134 } 135 #endif 136 137 /* 138 * Generate a last-resort interface identifier, when the machine has no 139 * IEEE802/EUI64 address sources. 140 * The goal here is to get an interface identifier that is 141 * (1) random enough and (2) does not change across reboot. 142 * We currently use MD5(hostname) for it. 143 */ 144 static int 145 get_rand_ifid(struct ifnet *ifp, 146 struct in6_addr *in6) /* upper 64bits are preserved */ 147 { 148 MD5_CTX ctxt; 149 u_int8_t digest[16]; 150 151 #if 0 152 /* we need at least several letters as seed for ifid */ 153 if (hostnamelen < 3) 154 return -1; 155 #endif 156 157 /* generate 8 bytes of pseudo-random value. */ 158 memset(&ctxt, 0, sizeof(ctxt)); 159 MD5Init(&ctxt); 160 MD5Update(&ctxt, (u_char *)hostname, hostnamelen); 161 MD5Final(digest, &ctxt); 162 163 /* assumes sizeof(digest) > sizeof(ifid) */ 164 memcpy(&in6->s6_addr[8], digest, 8); 165 166 /* make sure to set "u" bit to local, and "g" bit to individual. */ 167 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 168 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 169 170 /* convert EUI64 into IPv6 interface identifier */ 171 EUI64_TO_IFID(in6); 172 173 return 0; 174 } 175 176 static int 177 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 178 { 179 MD5_CTX ctxt; 180 u_int8_t seed[16], digest[16], nullbuf[8]; 181 /* 182 * interface ID for subnet anycast addresses. 183 * XXX: we assume the unicast address range that requires IDs 184 * in EUI-64 format. 185 */ 186 static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff, 187 0xff, 0xff, 0xff, 0x80 }; 188 static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe }; 189 int badid, retry = 0; 190 191 /* If there's no hisotry, start with a random seed. */ 192 memset(nullbuf, 0, sizeof(nullbuf)); 193 if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 194 cprng_fast(seed, sizeof(seed)); 195 } else 196 memcpy(seed, seed0, 8); 197 198 /* copy the right-most 64-bits of the given address */ 199 /* XXX assumption on the size of IFID */ 200 memcpy(&seed[8], seed1, 8); 201 202 again: 203 /* for debugging purposes only */ 204 #if 0 205 { 206 int i; 207 208 printf("generate_tmp_ifid: new randomized ID from: "); 209 for (i = 0; i < 16; i++) 210 printf("%02x", seed[i]); 211 printf(" "); 212 } 213 #endif 214 215 /* generate 16 bytes of pseudo-random value. */ 216 memset(&ctxt, 0, sizeof(ctxt)); 217 MD5Init(&ctxt); 218 MD5Update(&ctxt, seed, sizeof(seed)); 219 MD5Final(digest, &ctxt); 220 221 /* 222 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3) 223 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 224 * left-most bit is numbered 0) to zero. 225 */ 226 memcpy(ret, digest, 8); 227 ret[0] &= ~EUI64_UBIT; 228 229 /* 230 * Reject inappropriate identifiers according to 231 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4) 232 * At this moment, we reject following cases: 233 * - all 0 identifier 234 * - identifiers that conflict with reserved subnet anycast addresses, 235 * which are defined in RFC 2526. 236 * - identifiers that conflict with ISATAP addresses 237 * - identifiers used in our own addresses 238 */ 239 badid = 0; 240 if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0) 241 badid = 1; 242 else if (memcmp(anycast_id, ret, 7) == 0 && 243 (anycast_id[7] & ret[7]) == anycast_id[7]) { 244 badid = 1; 245 } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0) 246 badid = 1; 247 else { 248 struct in6_ifaddr *ia; 249 250 for (ia = in6_ifaddr; ia; ia = ia->ia_next) { 251 if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8], 252 ret, 8)) { 253 badid = 1; 254 break; 255 } 256 } 257 } 258 259 /* 260 * In the event that an unacceptable identifier has been generated, 261 * restart the process, using the right-most 64 bits of the MD5 digest 262 * obtained in place of the history value. 263 */ 264 if (badid) { 265 /* for debugging purposes only */ 266 #if 0 267 { 268 int i; 269 270 printf("unacceptable random ID: "); 271 for (i = 0; i < 16; i++) 272 printf("%02x", digest[i]); 273 printf("\n"); 274 } 275 #endif 276 277 if (++retry < GEN_TEMPID_RETRY_MAX) { 278 memcpy(seed, &digest[8], 8); 279 goto again; 280 } else { 281 /* 282 * We're so unlucky. Give up for now, and return 283 * all 0 IDs to tell the caller not to make a 284 * temporary address. 285 */ 286 nd6log((LOG_NOTICE, 287 "generate_tmp_ifid: never found a good ID\n")); 288 memset(ret, 0, 8); 289 } 290 } 291 292 /* 293 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6) 294 * Take the rightmost 64-bits of the MD5 digest and save them in 295 * stable storage as the history value to be used in the next 296 * iteration of the algorithm. 297 */ 298 memcpy(seed0, &digest[8], 8); 299 300 /* for debugging purposes only */ 301 #if 0 302 { 303 int i; 304 305 printf("to: "); 306 for (i = 0; i < 16; i++) 307 printf("%02x", digest[i]); 308 printf("\n"); 309 } 310 #endif 311 312 return 0; 313 } 314 315 /* 316 * Get interface identifier for the specified interface. 317 * 318 * in6 - upper 64bits are preserved 319 */ 320 int 321 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 322 { 323 struct ifaddr *ifa; 324 const struct sockaddr_dl *sdl = NULL, *tsdl; 325 const char *addr; 326 size_t addrlen; 327 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 328 static u_int8_t allone[8] = 329 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 330 331 IFADDR_FOREACH(ifa, ifp) { 332 if (ifa->ifa_addr->sa_family != AF_LINK) 333 continue; 334 tsdl = satocsdl(ifa->ifa_addr); 335 if (tsdl == NULL || tsdl->sdl_alen == 0) 336 continue; 337 if (sdl == NULL || ifa == ifp->if_dl || ifa == ifp->if_hwdl) 338 sdl = tsdl; 339 if (ifa == ifp->if_hwdl) 340 break; 341 } 342 343 if (sdl == NULL) 344 return -1; 345 346 addr = CLLADDR(sdl); 347 addrlen = sdl->sdl_alen; 348 349 switch (ifp->if_type) { 350 case IFT_IEEE1394: 351 case IFT_IEEE80211: 352 /* IEEE1394 uses 16byte length address starting with EUI64 */ 353 if (addrlen > 8) 354 addrlen = 8; 355 break; 356 default: 357 break; 358 } 359 360 /* get EUI64 */ 361 switch (ifp->if_type) { 362 /* IEEE802/EUI64 cases - what others? */ 363 case IFT_ETHER: 364 case IFT_FDDI: 365 case IFT_ATM: 366 case IFT_IEEE1394: 367 case IFT_IEEE80211: 368 /* look at IEEE802/EUI64 only */ 369 if (addrlen != 8 && addrlen != 6) 370 return -1; 371 372 /* 373 * check for invalid MAC address - on bsdi, we see it a lot 374 * since wildboar configures all-zero MAC on pccard before 375 * card insertion. 376 */ 377 if (memcmp(addr, allzero, addrlen) == 0) 378 return -1; 379 if (memcmp(addr, allone, addrlen) == 0) 380 return -1; 381 382 /* make EUI64 address */ 383 if (addrlen == 8) 384 memcpy(&in6->s6_addr[8], addr, 8); 385 else if (addrlen == 6) { 386 in6->s6_addr[8] = addr[0]; 387 in6->s6_addr[9] = addr[1]; 388 in6->s6_addr[10] = addr[2]; 389 in6->s6_addr[11] = 0xff; 390 in6->s6_addr[12] = 0xfe; 391 in6->s6_addr[13] = addr[3]; 392 in6->s6_addr[14] = addr[4]; 393 in6->s6_addr[15] = addr[5]; 394 } 395 break; 396 397 case IFT_ARCNET: 398 if (addrlen != 1) 399 return -1; 400 if (!addr[0]) 401 return -1; 402 403 memset(&in6->s6_addr[8], 0, 8); 404 in6->s6_addr[15] = addr[0]; 405 406 /* 407 * due to insufficient bitwidth, we mark it local. 408 */ 409 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 410 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 411 break; 412 413 case IFT_GIF: 414 #ifdef IFT_STF 415 case IFT_STF: 416 #endif 417 /* 418 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 419 * however, IPv4 address is not very suitable as unique 420 * identifier source (can be renumbered). 421 * we don't do this. 422 */ 423 return -1; 424 425 default: 426 return -1; 427 } 428 429 /* sanity check: g bit must not indicate "group" */ 430 if (EUI64_GROUP(in6)) 431 return -1; 432 433 /* convert EUI64 into IPv6 interface identifier */ 434 EUI64_TO_IFID(in6); 435 436 /* 437 * sanity check: ifid must not be all zero, avoid conflict with 438 * subnet router anycast 439 */ 440 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 441 memcmp(&in6->s6_addr[9], allzero, 7) == 0) { 442 return -1; 443 } 444 445 return 0; 446 } 447 448 /* 449 * Get interface identifier for the specified interface. If it is not 450 * available on ifp0, borrow interface identifier from other information 451 * sources. 452 * 453 * altifp - secondary EUI64 source 454 */ 455 static int 456 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 457 struct in6_addr *in6) 458 { 459 struct ifnet *ifp; 460 461 /* first, try to get it from the interface itself */ 462 if (in6_get_hw_ifid(ifp0, in6) == 0) { 463 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 464 if_name(ifp0))); 465 goto success; 466 } 467 468 /* try secondary EUI64 source. this basically is for ATM PVC */ 469 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 470 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 471 if_name(ifp0), if_name(altifp))); 472 goto success; 473 } 474 475 /* next, try to get it from some other hardware interface */ 476 IFNET_FOREACH(ifp) { 477 if (ifp == ifp0) 478 continue; 479 if (in6_get_hw_ifid(ifp, in6) != 0) 480 continue; 481 482 /* 483 * to borrow ifid from other interface, ifid needs to be 484 * globally unique 485 */ 486 if (IFID_UNIVERSAL(in6)) { 487 nd6log((LOG_DEBUG, 488 "%s: borrow interface identifier from %s\n", 489 if_name(ifp0), if_name(ifp))); 490 goto success; 491 } 492 } 493 494 #if 0 495 /* get from hostid - only for certain architectures */ 496 if (get_hostid_ifid(ifp, in6) == 0) { 497 nd6log((LOG_DEBUG, 498 "%s: interface identifier generated by hostid\n", 499 if_name(ifp0))); 500 goto success; 501 } 502 #endif 503 504 /* last resort: get from random number source */ 505 if (get_rand_ifid(ifp, in6) == 0) { 506 nd6log((LOG_DEBUG, 507 "%s: interface identifier generated by random number\n", 508 if_name(ifp0))); 509 goto success; 510 } 511 512 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 513 return -1; 514 515 success: 516 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 517 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 518 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 519 in6->s6_addr[14], in6->s6_addr[15])); 520 return 0; 521 } 522 523 /* 524 * altifp - secondary EUI64 source 525 */ 526 527 static int 528 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 529 { 530 struct in6_ifaddr *ia __diagused; 531 struct in6_aliasreq ifra; 532 struct nd_prefixctl pr0; 533 int i, error; 534 535 /* 536 * configure link-local address. 537 */ 538 memset(&ifra, 0, sizeof(ifra)); 539 540 /* 541 * in6_update_ifa() does not use ifra_name, but we accurately set it 542 * for safety. 543 */ 544 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 545 546 ifra.ifra_addr.sin6_family = AF_INET6; 547 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 548 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 549 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 550 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 551 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 552 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 553 } else { 554 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 555 nd6log((LOG_ERR, 556 "%s: no ifid available\n", if_name(ifp))); 557 return -1; 558 } 559 } 560 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 561 return -1; 562 563 sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0); 564 /* link-local addresses should NEVER expire. */ 565 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 566 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 567 568 /* 569 * Now call in6_update_ifa() to do a bunch of procedures to configure 570 * a link-local address. We can set the 3rd argument to NULL, because 571 * we know there's no other link-local address on the interface 572 * and therefore we are adding one (instead of updating one). 573 */ 574 if ((error = in6_update_ifa(ifp, &ifra, NULL, 575 IN6_IFAUPDATE_DADDELAY)) != 0) { 576 /* 577 * XXX: When the interface does not support IPv6, this call 578 * would fail in the SIOCINITIFADDR ioctl. I believe the 579 * notification is rather confusing in this case, so just 580 * suppress it. (jinmei@kame.net 20010130) 581 */ 582 if (error != EAFNOSUPPORT) 583 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 584 "configure a link-local address on %s " 585 "(errno=%d)\n", 586 if_name(ifp), error)); 587 return -1; 588 } 589 590 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 591 KASSERTMSG(ia, "ia == NULL in in6_ifattach_linklocal"); 592 593 /* 594 * Make the link-local prefix (fe80::/64%link) as on-link. 595 * Since we'd like to manage prefixes separately from addresses, 596 * we make an ND6 prefix structure for the link-local prefix, 597 * and add it to the prefix list as a never-expire prefix. 598 * XXX: this change might affect some existing code base... 599 */ 600 memset(&pr0, 0, sizeof(pr0)); 601 pr0.ndpr_ifp = ifp; 602 /* this should be 64 at this moment. */ 603 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 604 pr0.ndpr_prefix = ifra.ifra_addr; 605 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 606 for (i = 0; i < 4; i++) { 607 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 608 in6mask64.s6_addr32[i]; 609 } 610 /* 611 * Initialize parameters. The link-local prefix must always be 612 * on-link, and its lifetimes never expire. 613 */ 614 pr0.ndpr_raf_onlink = 1; 615 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 616 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 617 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 618 /* 619 * Since there is no other link-local addresses, nd6_prefix_lookup() 620 * probably returns NULL. However, we cannot always expect the result. 621 * For example, if we first remove the (only) existing link-local 622 * address, and then reconfigure another one, the prefix is still 623 * valid with referring to the old link-local address. 624 */ 625 if (nd6_prefix_lookup(&pr0) == NULL) { 626 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 627 return error; 628 } 629 630 return 0; 631 } 632 633 /* 634 * ifp - mut be IFT_LOOP 635 */ 636 637 static int 638 in6_ifattach_loopback(struct ifnet *ifp) 639 { 640 struct in6_aliasreq ifra; 641 int error; 642 643 memset(&ifra, 0, sizeof(ifra)); 644 645 /* 646 * in6_update_ifa() does not use ifra_name, but we accurately set it 647 * for safety. 648 */ 649 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 650 651 sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0); 652 653 /* 654 * Always initialize ia_dstaddr (= broadcast address) to loopback 655 * address. Follows IPv4 practice - see in_ifinit(). 656 */ 657 sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0); 658 659 sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0); 660 661 /* the loopback address should NEVER expire. */ 662 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 663 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 664 665 /* we don't need to perform DAD on loopback interfaces. */ 666 ifra.ifra_flags |= IN6_IFF_NODAD; 667 668 /* 669 * We are sure that this is a newly assigned address, so we can set 670 * NULL to the 3rd arg. 671 */ 672 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 673 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 674 "the loopback address on %s (errno=%d)\n", 675 if_name(ifp), error)); 676 return -1; 677 } 678 679 return 0; 680 } 681 682 /* 683 * compute NI group address, based on the current hostname setting. 684 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 685 * 686 * when ifp == NULL, the caller is responsible for filling scopeid. 687 */ 688 int 689 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 690 struct sockaddr_in6 *sa6) 691 { 692 const char *p; 693 u_int8_t *q; 694 MD5_CTX ctxt; 695 u_int8_t digest[16]; 696 u_int8_t l; 697 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 698 699 if (!namelen || !name) 700 return -1; 701 702 p = name; 703 while (p && *p && *p != '.' && p - name < namelen) 704 p++; 705 if (p - name > sizeof(n) - 1) 706 return -1; /* label too long */ 707 l = p - name; 708 strncpy((char *)n, name, l); 709 n[(int)l] = '\0'; 710 for (q = n; *q; q++) { 711 if ('A' <= *q && *q <= 'Z') 712 *q = *q - 'A' + 'a'; 713 } 714 715 /* generate 8 bytes of pseudo-random value. */ 716 memset(&ctxt, 0, sizeof(ctxt)); 717 MD5Init(&ctxt); 718 MD5Update(&ctxt, &l, sizeof(l)); 719 MD5Update(&ctxt, n, l); 720 MD5Final(digest, &ctxt); 721 722 memset(sa6, 0, sizeof(*sa6)); 723 sa6->sin6_family = AF_INET6; 724 sa6->sin6_len = sizeof(*sa6); 725 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 726 sa6->sin6_addr.s6_addr8[11] = 2; 727 memcpy(&sa6->sin6_addr.s6_addr32[3], digest, 728 sizeof(sa6->sin6_addr.s6_addr32[3])); 729 if (in6_setscope(&sa6->sin6_addr, ifp, NULL)) 730 return -1; /* XXX: should not fail */ 731 732 return 0; 733 } 734 735 /* 736 * XXX multiple loopback interface needs more care. for instance, 737 * nodelocal address needs to be configured onto only one of them. 738 * XXX multiple link-local address case 739 * 740 * altifp - secondary EUI64 source 741 */ 742 void 743 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 744 { 745 struct in6_ifaddr *ia; 746 struct in6_addr in6; 747 748 /* some of the interfaces are inherently not IPv6 capable */ 749 switch (ifp->if_type) { 750 case IFT_BRIDGE: 751 #ifdef IFT_PFLOG 752 case IFT_PFLOG: 753 #endif 754 #ifdef IFT_PFSYNC 755 case IFT_PFSYNC: 756 #endif 757 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 758 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 759 return; 760 } 761 762 /* 763 * if link mtu is too small, don't try to configure IPv6. 764 * remember there could be some link-layer that has special 765 * fragmentation logic. 766 */ 767 if (ifp->if_mtu < IPV6_MMTU) { 768 nd6log((LOG_INFO, "in6_ifattach: " 769 "%s has too small MTU, IPv6 not enabled\n", 770 if_name(ifp))); 771 return; 772 } 773 774 /* create a multicast kludge storage (if we have not had one) */ 775 in6_createmkludge(ifp); 776 777 /* 778 * quirks based on interface type 779 */ 780 switch (ifp->if_type) { 781 #ifdef IFT_STF 782 case IFT_STF: 783 /* 784 * 6to4 interface is a very special kind of beast. 785 * no multicast, no linklocal. RFC2529 specifies how to make 786 * linklocals for 6to4 interface, but there's no use and 787 * it is rather harmful to have one. 788 */ 789 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 790 return; 791 #endif 792 case IFT_CARP: 793 return; 794 default: 795 break; 796 } 797 798 /* 799 * usually, we require multicast capability to the interface 800 */ 801 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 802 nd6log((LOG_INFO, "in6_ifattach: " 803 "%s is not multicast capable, IPv6 not enabled\n", 804 if_name(ifp))); 805 return; 806 } 807 808 /* 809 * assign loopback address for loopback interface. 810 * XXX multiple loopback interface case. 811 */ 812 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 813 in6 = in6addr_loopback; 814 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 815 if (in6_ifattach_loopback(ifp) != 0) 816 return; 817 } 818 } 819 820 /* 821 * assign a link-local address, if there's none. 822 */ 823 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 824 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) 825 { 826 ia = in6ifa_ifpforlinklocal(ifp, 0); 827 if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) { 828 printf("%s: cannot assign link-local address\n", 829 ifp->if_xname); 830 } 831 } 832 } 833 834 /* 835 * NOTE: in6_ifdetach() does not support loopback if at this moment. 836 * We don't need this function in bsdi, because interfaces are never removed 837 * from the ifnet list in bsdi. 838 */ 839 void 840 in6_ifdetach(struct ifnet *ifp) 841 { 842 struct in6_ifaddr *ia, *oia; 843 struct ifaddr *ifa, *next; 844 struct rtentry *rt; 845 short rtflags; 846 struct in6_multi_mship *imm; 847 848 /* remove ip6_mrouter stuff */ 849 ip6_mrouter_detach(ifp); 850 851 /* remove neighbor management table */ 852 nd6_purge(ifp); 853 854 /* XXX this code is duplicated in in6_purgeif() --dyoung */ 855 /* nuke any of IPv6 addresses we have */ 856 if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); 857 858 /* XXX isn't this code is redundant, given the above? --dyoung */ 859 /* XXX doesn't this code replicate code in in6_purgeaddr() ? --dyoung */ 860 /* undo everything done by in6_ifattach(), just in case */ 861 for (ifa = IFADDR_FIRST(ifp); ifa != NULL; ifa = next) { 862 next = IFADDR_NEXT(ifa); 863 864 if (ifa->ifa_addr->sa_family != AF_INET6 865 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 866 continue; 867 } 868 869 ia = (struct in6_ifaddr *)ifa; 870 871 /* 872 * leave from multicast groups we have joined for the interface 873 */ 874 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 875 LIST_REMOVE(imm, i6mm_chain); 876 in6_leavegroup(imm); 877 } 878 879 /* remove from the routing table */ 880 if ((ia->ia_flags & IFA_ROUTE) && 881 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0))) { 882 rtflags = rt->rt_flags; 883 rtfree(rt); 884 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 885 (struct sockaddr *)&ia->ia_addr, 886 (struct sockaddr *)&ia->ia_prefixmask, 887 rtflags, NULL); 888 } 889 890 /* remove from the linked list */ 891 ifa_remove(ifp, &ia->ia_ifa); 892 893 /* also remove from the IPv6 address chain(itojun&jinmei) */ 894 oia = ia; 895 if (oia == (ia = in6_ifaddr)) 896 in6_ifaddr = ia->ia_next; 897 else { 898 while (ia->ia_next && (ia->ia_next != oia)) 899 ia = ia->ia_next; 900 if (ia->ia_next) 901 ia->ia_next = oia->ia_next; 902 else { 903 nd6log((LOG_ERR, 904 "%s: didn't unlink in6ifaddr from list\n", 905 if_name(ifp))); 906 } 907 } 908 909 IFAFREE(&oia->ia_ifa); 910 } 911 912 /* cleanup multicast address kludge table, if there is any */ 913 in6_purgemkludge(ifp); 914 915 /* 916 * remove neighbor management table. we call it twice just to make 917 * sure we nuke everything. maybe we need just one call. 918 * XXX: since the first call did not release addresses, some prefixes 919 * might remain. We should call nd6_purge() again to release the 920 * prefixes after removing all addresses above. 921 * (Or can we just delay calling nd6_purge until at this point?) 922 */ 923 nd6_purge(ifp); 924 } 925 926 int 927 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 928 const u_int8_t *baseid, int generate) 929 { 930 u_int8_t nullbuf[8]; 931 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 932 933 memset(nullbuf, 0, sizeof(nullbuf)); 934 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 935 /* we've never created a random ID. Create a new one. */ 936 generate = 1; 937 } 938 939 if (generate) { 940 memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1)); 941 942 /* generate_tmp_ifid will update seedn and buf */ 943 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 944 ndi->randomid); 945 } 946 memcpy(retbuf, ndi->randomid, 8); 947 if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) { 948 /* generate_tmp_ifid could not found a good ID. */ 949 return -1; 950 } 951 952 return 0; 953 } 954 955 void 956 in6_tmpaddrtimer(void *ignored_arg) 957 { 958 struct nd_ifinfo *ndi; 959 u_int8_t nullbuf[8]; 960 struct ifnet *ifp; 961 962 mutex_enter(softnet_lock); 963 KERNEL_LOCK(1, NULL); 964 965 callout_reset(&in6_tmpaddrtimer_ch, 966 (ip6_temp_preferred_lifetime - ip6_desync_factor - 967 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 968 969 memset(nullbuf, 0, sizeof(nullbuf)); 970 IFNET_FOREACH(ifp) { 971 ndi = ND_IFINFO(ifp); 972 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 973 /* 974 * We've been generating a random ID on this interface. 975 * Create a new one. 976 */ 977 (void)generate_tmp_ifid(ndi->randomseed0, 978 ndi->randomseed1, ndi->randomid); 979 } 980 } 981 982 KERNEL_UNLOCK_ONE(NULL); 983 mutex_exit(softnet_lock); 984 } 985