1 /* $NetBSD: in6_ifattach.c,v 1.115 2018/05/01 07:21:39 maxv 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 1.115 2018/05/01 07:21:39 maxv Exp $"); 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/kmem.h> 39 #include <sys/socket.h> 40 #include <sys/sockio.h> 41 #include <sys/kernel.h> 42 #include <sys/syslog.h> 43 #include <sys/md5.h> 44 #include <sys/socketvar.h> 45 #include <sys/cprng.h> 46 47 #include <net/if.h> 48 #include <net/if_dl.h> 49 #include <net/if_types.h> 50 #include <net/route.h> 51 52 #include <netinet/in.h> 53 #include <netinet/in_var.h> 54 55 #include <netinet/ip6.h> 56 #include <netinet6/in6_ifattach.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet6/nd6.h> 59 #include <netinet6/ip6_mroute.h> 60 #include <netinet6/scope6_var.h> 61 62 unsigned long in6_maxmtu = 0; 63 64 int ip6_auto_linklocal = 1; /* enable by default */ 65 66 callout_t in6_tmpaddrtimer_ch; 67 68 69 #if 0 70 static int get_hostid_ifid(struct ifnet *, struct in6_addr *); 71 #endif 72 static int get_rand_ifid(struct in6_addr *); 73 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 74 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 75 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 76 static int in6_ifattach_loopback(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 * in6 - upper 64bits are preserved 100 */ 101 static int 102 get_hostid_ifid(struct ifnet *ifp, struct in6_addr *in6) 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(struct in6_addr *in6) /* upper 64bits are preserved */ 143 { 144 MD5_CTX ctxt; 145 u_int8_t digest[16]; 146 147 #if 0 148 /* we need at least several letters as seed for ifid */ 149 if (hostnamelen < 3) 150 return -1; 151 #endif 152 153 /* generate 8 bytes of pseudo-random value. */ 154 memset(&ctxt, 0, sizeof(ctxt)); 155 MD5Init(&ctxt); 156 MD5Update(&ctxt, (u_char *)hostname, hostnamelen); 157 MD5Final(digest, &ctxt); 158 159 /* assumes sizeof(digest) > sizeof(ifid) */ 160 memcpy(&in6->s6_addr[8], digest, 8); 161 162 /* make sure to set "u" bit to local, and "g" bit to individual. */ 163 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 164 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 165 166 /* convert EUI64 into IPv6 interface identifier */ 167 EUI64_TO_IFID(in6); 168 169 return 0; 170 } 171 172 static int 173 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 174 { 175 MD5_CTX ctxt; 176 u_int8_t seed[16], digest[16], nullbuf[8]; 177 /* 178 * interface ID for subnet anycast addresses. 179 * XXX: we assume the unicast address range that requires IDs 180 * in EUI-64 format. 181 */ 182 static const uint8_t anycast_id[8] = { 0xfd, 0xff, 0xff, 0xff, 183 0xff, 0xff, 0xff, 0x80 }; 184 static const uint8_t isatap_id[4] = { 0x00, 0x00, 0x5e, 0xfe }; 185 int badid, retry = 0; 186 187 /* If there's no hisotry, start with a random seed. */ 188 memset(nullbuf, 0, sizeof(nullbuf)); 189 if (memcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 190 cprng_fast(seed, sizeof(seed)); 191 } else 192 memcpy(seed, seed0, 8); 193 194 /* copy the right-most 64-bits of the given address */ 195 /* XXX assumption on the size of IFID */ 196 memcpy(&seed[8], seed1, 8); 197 198 again: 199 /* for debugging purposes only */ 200 #if 0 201 { 202 int i; 203 204 printf("generate_tmp_ifid: new randomized ID from: "); 205 for (i = 0; i < 16; i++) 206 printf("%02x", seed[i]); 207 printf(" "); 208 } 209 #endif 210 211 /* generate 16 bytes of pseudo-random value. */ 212 memset(&ctxt, 0, sizeof(ctxt)); 213 MD5Init(&ctxt); 214 MD5Update(&ctxt, seed, sizeof(seed)); 215 MD5Final(digest, &ctxt); 216 217 /* 218 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (3) 219 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 220 * left-most bit is numbered 0) to zero. 221 */ 222 memcpy(ret, digest, 8); 223 ret[0] &= ~EUI64_UBIT; 224 225 /* 226 * Reject inappropriate identifiers according to 227 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (4) 228 * At this moment, we reject following cases: 229 * - all 0 identifier 230 * - identifiers that conflict with reserved subnet anycast addresses, 231 * which are defined in RFC 2526. 232 * - identifiers that conflict with ISATAP addresses 233 * - identifiers used in our own addresses 234 */ 235 badid = 0; 236 if (memcmp(nullbuf, ret, sizeof(nullbuf)) == 0) 237 badid = 1; 238 else if (memcmp(anycast_id, ret, 7) == 0 && 239 (anycast_id[7] & ret[7]) == anycast_id[7]) { 240 badid = 1; 241 } else if (memcmp(isatap_id, ret, sizeof(isatap_id)) == 0) 242 badid = 1; 243 else { 244 struct in6_ifaddr *ia; 245 int s = pserialize_read_enter(); 246 247 IN6_ADDRLIST_READER_FOREACH(ia) { 248 if (!memcmp(&ia->ia_addr.sin6_addr.s6_addr[8], 249 ret, 8)) { 250 badid = 1; 251 break; 252 } 253 } 254 pserialize_read_exit(s); 255 } 256 257 /* 258 * In the event that an unacceptable identifier has been generated, 259 * restart the process, using the right-most 64 bits of the MD5 digest 260 * obtained in place of the history value. 261 */ 262 if (badid) { 263 /* for debugging purposes only */ 264 #if 0 265 { 266 int i; 267 268 printf("unacceptable random ID: "); 269 for (i = 0; i < 16; i++) 270 printf("%02x", digest[i]); 271 printf("\n"); 272 } 273 #endif 274 275 if (++retry < GEN_TEMPID_RETRY_MAX) { 276 memcpy(seed, &digest[8], 8); 277 goto again; 278 } else { 279 /* 280 * We're so unlucky. Give up for now, and return 281 * all 0 IDs to tell the caller not to make a 282 * temporary address. 283 */ 284 nd6log(LOG_NOTICE, "never found a good ID\n"); 285 memset(ret, 0, 8); 286 } 287 } 288 289 /* 290 * draft-ietf-ipngwg-temp-addresses-v2-00.txt 3.2.1. (6) 291 * Take the rightmost 64-bits of the MD5 digest and save them in 292 * stable storage as the history value to be used in the next 293 * iteration of the algorithm. 294 */ 295 memcpy(seed0, &digest[8], 8); 296 297 /* for debugging purposes only */ 298 #if 0 299 { 300 int i; 301 302 printf("to: "); 303 for (i = 0; i < 16; i++) 304 printf("%02x", digest[i]); 305 printf("\n"); 306 } 307 #endif 308 309 return 0; 310 } 311 312 /* 313 * Get interface identifier for the specified interface. 314 * 315 * in6 - upper 64bits are preserved 316 */ 317 int 318 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 319 { 320 struct ifaddr *ifa; 321 const struct sockaddr_dl *sdl = NULL; 322 const char *addr = NULL; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ 323 size_t addrlen = 0; /* XXX gcc 4.8 -Werror=maybe-uninitialized */ 324 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 325 static u_int8_t allone[8] = 326 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 327 int s; 328 329 s = pserialize_read_enter(); 330 IFADDR_READER_FOREACH(ifa, ifp) { 331 const struct sockaddr_dl *tsdl; 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 addr = CLLADDR(sdl); 340 addrlen = sdl->sdl_alen; 341 } 342 if (ifa == ifp->if_hwdl) 343 break; 344 } 345 pserialize_read_exit(s); 346 347 if (sdl == NULL) 348 return -1; 349 350 switch (ifp->if_type) { 351 case IFT_IEEE1394: 352 case IFT_IEEE80211: 353 /* IEEE1394 uses 16byte length address starting with EUI64 */ 354 if (addrlen > 8) 355 addrlen = 8; 356 break; 357 default: 358 break; 359 } 360 361 /* get EUI64 */ 362 switch (ifp->if_type) { 363 /* IEEE802/EUI64 cases - what others? */ 364 case IFT_ETHER: 365 case IFT_FDDI: 366 case IFT_ATM: 367 case IFT_IEEE1394: 368 case IFT_IEEE80211: 369 /* look at IEEE802/EUI64 only */ 370 if (addrlen != 8 && addrlen != 6) 371 return -1; 372 373 /* 374 * check for invalid MAC address - on bsdi, we see it a lot 375 * since wildboar configures all-zero MAC on pccard before 376 * card insertion. 377 */ 378 if (memcmp(addr, allzero, addrlen) == 0) 379 return -1; 380 if (memcmp(addr, allone, addrlen) == 0) 381 return -1; 382 383 /* make EUI64 address */ 384 if (addrlen == 8) 385 memcpy(&in6->s6_addr[8], addr, 8); 386 else if (addrlen == 6) { 387 in6->s6_addr[8] = addr[0]; 388 in6->s6_addr[9] = addr[1]; 389 in6->s6_addr[10] = addr[2]; 390 in6->s6_addr[11] = 0xff; 391 in6->s6_addr[12] = 0xfe; 392 in6->s6_addr[13] = addr[3]; 393 in6->s6_addr[14] = addr[4]; 394 in6->s6_addr[15] = addr[5]; 395 } 396 break; 397 398 case IFT_ARCNET: 399 if (addrlen != 1) 400 return -1; 401 if (!addr[0]) 402 return -1; 403 404 memset(&in6->s6_addr[8], 0, 8); 405 in6->s6_addr[15] = addr[0]; 406 407 /* 408 * due to insufficient bitwidth, we mark it local. 409 */ 410 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 411 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 412 break; 413 414 case IFT_GIF: 415 #ifdef IFT_STF 416 case IFT_STF: 417 #endif 418 /* 419 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 420 * however, IPv4 address is not very suitable as unique 421 * identifier source (can be renumbered). 422 * we don't do this. 423 */ 424 return -1; 425 426 default: 427 return -1; 428 } 429 430 /* sanity check: g bit must not indicate "group" */ 431 if (EUI64_GROUP(in6)) 432 return -1; 433 434 /* convert EUI64 into IPv6 interface identifier */ 435 EUI64_TO_IFID(in6); 436 437 /* 438 * sanity check: ifid must not be all zero, avoid conflict with 439 * subnet router anycast 440 */ 441 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 442 memcmp(&in6->s6_addr[9], allzero, 7) == 0) { 443 return -1; 444 } 445 446 return 0; 447 } 448 449 /* 450 * Get interface identifier for the specified interface. If it is not 451 * available on ifp0, borrow interface identifier from other information 452 * sources. 453 * 454 * altifp - secondary EUI64 source 455 */ 456 static int 457 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 458 struct in6_addr *in6) 459 { 460 struct ifnet *ifp; 461 int s; 462 463 /* first, try to get it from the interface itself */ 464 if (in6_get_hw_ifid(ifp0, in6) == 0) { 465 nd6log(LOG_DEBUG, "%s: got interface identifier from itself\n", 466 if_name(ifp0)); 467 goto success; 468 } 469 470 /* try secondary EUI64 source. this basically is for ATM PVC */ 471 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 472 nd6log(LOG_DEBUG, "%s: got interface identifier from %s\n", 473 if_name(ifp0), if_name(altifp)); 474 goto success; 475 } 476 477 /* next, try to get it from some other hardware interface */ 478 s = pserialize_read_enter(); 479 IFNET_READER_FOREACH(ifp) { 480 if (ifp == ifp0) 481 continue; 482 if (in6_get_hw_ifid(ifp, in6) != 0) 483 continue; 484 485 /* 486 * to borrow ifid from other interface, ifid needs to be 487 * globally unique 488 */ 489 if (IFID_UNIVERSAL(in6)) { 490 nd6log(LOG_DEBUG, 491 "%s: borrow interface identifier from %s\n", 492 if_name(ifp0), if_name(ifp)); 493 pserialize_read_exit(s); 494 goto success; 495 } 496 } 497 pserialize_read_exit(s); 498 499 #if 0 500 /* get from hostid - only for certain architectures */ 501 if (get_hostid_ifid(ifp, in6) == 0) { 502 nd6log(LOG_DEBUG, 503 "%s: interface identifier generated by hostid\n", 504 if_name(ifp0)); 505 goto success; 506 } 507 #endif 508 509 /* last resort: get from random number source */ 510 if (get_rand_ifid(in6) == 0) { 511 nd6log(LOG_DEBUG, 512 "%s: interface identifier generated by random number\n", 513 if_name(ifp0)); 514 goto success; 515 } 516 517 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 518 return -1; 519 520 success: 521 nd6log(LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 522 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 523 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 524 in6->s6_addr[14], in6->s6_addr[15]); 525 return 0; 526 } 527 528 /* 529 * altifp - secondary EUI64 source 530 */ 531 532 static int 533 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 534 { 535 struct in6_aliasreq ifra; 536 int error; 537 538 /* 539 * configure link-local address. 540 */ 541 memset(&ifra, 0, sizeof(ifra)); 542 543 /* 544 * in6_update_ifa() does not use ifra_name, but we accurately set it 545 * for safety. 546 */ 547 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 548 549 ifra.ifra_addr.sin6_family = AF_INET6; 550 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 551 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 552 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 553 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 554 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 555 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 556 } else { 557 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 558 nd6log(LOG_ERR, 559 "%s: no ifid available\n", if_name(ifp)); 560 return -1; 561 } 562 } 563 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 564 return -1; 565 566 sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask64, 0, 0, 0); 567 /* link-local addresses should NEVER expire. */ 568 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 569 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 570 571 /* 572 * Now call in6_update_ifa() to do a bunch of procedures to configure 573 * a link-local address. We can set the 3rd argument to NULL, because 574 * we know there's no other link-local address on the interface 575 * and therefore we are adding one (instead of updating one). 576 */ 577 if ((error = in6_update_ifa(ifp, &ifra, IN6_IFAUPDATE_DADDELAY)) != 0) { 578 /* 579 * XXX: When the interface does not support IPv6, this call 580 * would fail in the SIOCINITIFADDR ioctl. I believe the 581 * notification is rather confusing in this case, so just 582 * suppress it. (jinmei@kame.net 20010130) 583 */ 584 if (error != EAFNOSUPPORT) 585 nd6log(LOG_NOTICE, 586 "failed to configure a link-local address on %s " 587 "(errno=%d)\n", 588 if_name(ifp), error); 589 return -1; 590 } 591 592 return 0; 593 } 594 595 /* 596 * ifp - mut be IFT_LOOP 597 */ 598 599 static int 600 in6_ifattach_loopback(struct ifnet *ifp) 601 { 602 struct in6_aliasreq ifra; 603 int error; 604 605 memset(&ifra, 0, sizeof(ifra)); 606 607 /* 608 * in6_update_ifa() does not use ifra_name, but we accurately set it 609 * for safety. 610 */ 611 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 612 613 sockaddr_in6_init(&ifra.ifra_prefixmask, &in6mask128, 0, 0, 0); 614 615 /* 616 * Always initialize ia_dstaddr (= broadcast address) to loopback 617 * address. Follows IPv4 practice - see in_ifinit(). 618 */ 619 sockaddr_in6_init(&ifra.ifra_dstaddr, &in6addr_loopback, 0, 0, 0); 620 621 sockaddr_in6_init(&ifra.ifra_addr, &in6addr_loopback, 0, 0, 0); 622 623 /* the loopback address should NEVER expire. */ 624 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 625 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 626 627 /* we don't need to perform DAD on loopback interfaces. */ 628 ifra.ifra_flags |= IN6_IFF_NODAD; 629 630 /* 631 * We are sure that this is a newly assigned address, so we can set 632 * NULL to the 3rd arg. 633 */ 634 if ((error = in6_update_ifa(ifp, &ifra, 0)) != 0) { 635 nd6log(LOG_ERR, "failed to configure " 636 "the loopback address on %s (errno=%d)\n", 637 if_name(ifp), error); 638 return -1; 639 } 640 641 return 0; 642 } 643 644 /* 645 * compute NI group address, based on the current hostname setting. 646 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 647 * 648 * when ifp == NULL, the caller is responsible for filling scopeid. 649 */ 650 int 651 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 652 struct sockaddr_in6 *sa6) 653 { 654 const char *p; 655 u_int8_t *q; 656 MD5_CTX ctxt; 657 u_int8_t digest[16]; 658 u_int8_t l; 659 u_int8_t n[64]; /* a single label must not exceed 63 chars */ 660 661 if (!namelen || !name) 662 return -1; 663 664 p = name; 665 while (p && *p && *p != '.' && p - name < namelen) 666 p++; 667 if (p - name > sizeof(n) - 1) 668 return -1; /* label too long */ 669 l = p - name; 670 strncpy((char *)n, name, l); 671 n[(int)l] = '\0'; 672 for (q = n; *q; q++) { 673 if ('A' <= *q && *q <= 'Z') 674 *q = *q - 'A' + 'a'; 675 } 676 677 /* generate 8 bytes of pseudo-random value. */ 678 memset(&ctxt, 0, sizeof(ctxt)); 679 MD5Init(&ctxt); 680 MD5Update(&ctxt, &l, sizeof(l)); 681 MD5Update(&ctxt, n, l); 682 MD5Final(digest, &ctxt); 683 684 memset(sa6, 0, sizeof(*sa6)); 685 sa6->sin6_family = AF_INET6; 686 sa6->sin6_len = sizeof(*sa6); 687 sa6->sin6_addr.s6_addr16[0] = htons(0xff02); 688 sa6->sin6_addr.s6_addr8[11] = 2; 689 memcpy(&sa6->sin6_addr.s6_addr32[3], digest, 690 sizeof(sa6->sin6_addr.s6_addr32[3])); 691 if (in6_setscope(&sa6->sin6_addr, ifp, NULL)) 692 return -1; /* XXX: should not fail */ 693 694 return 0; 695 } 696 697 /* 698 * XXX multiple loopback interface needs more care. for instance, 699 * nodelocal address needs to be configured onto only one of them. 700 * XXX multiple link-local address case 701 * 702 * altifp - secondary EUI64 source 703 */ 704 void 705 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 706 { 707 struct in6_ifaddr *ia; 708 struct in6_addr in6; 709 710 KASSERT(IFNET_LOCKED(ifp)); 711 712 /* some of the interfaces are inherently not IPv6 capable */ 713 switch (ifp->if_type) { 714 case IFT_BRIDGE: 715 case IFT_L2TP: 716 #ifdef IFT_PFLOG 717 case IFT_PFLOG: 718 #endif 719 #ifdef IFT_PFSYNC 720 case IFT_PFSYNC: 721 #endif 722 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 723 ND_IFINFO(ifp)->flags |= ND6_IFF_IFDISABLED; 724 return; 725 } 726 727 /* 728 * if link mtu is too small, don't try to configure IPv6. 729 * remember there could be some link-layer that has special 730 * fragmentation logic. 731 */ 732 if (ifp->if_mtu < IPV6_MMTU) { 733 nd6log(LOG_INFO, "%s has too small MTU, IPv6 not enabled\n", 734 if_name(ifp)); 735 return; 736 } 737 738 /* 739 * quirks based on interface type 740 */ 741 switch (ifp->if_type) { 742 #ifdef IFT_STF 743 case IFT_STF: 744 /* 745 * 6to4 interface is a very special kind of beast. 746 * no multicast, no linklocal. RFC2529 specifies how to make 747 * linklocals for 6to4 interface, but there's no use and 748 * it is rather harmful to have one. 749 */ 750 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 751 return; 752 #endif 753 case IFT_CARP: 754 return; 755 default: 756 break; 757 } 758 759 /* 760 * usually, we require multicast capability to the interface 761 */ 762 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 763 nd6log(LOG_INFO, 764 "%s is not multicast capable, IPv6 not enabled\n", 765 if_name(ifp)); 766 return; 767 } 768 769 /* 770 * assign loopback address for loopback interface. 771 * XXX multiple loopback interface case. 772 */ 773 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 774 in6 = in6addr_loopback; 775 /* These are safe and atomic thanks to IFNET_LOCK */ 776 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 777 if (in6_ifattach_loopback(ifp) != 0) 778 return; 779 } 780 } 781 782 /* 783 * assign a link-local address, if there's none. 784 */ 785 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 786 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 787 int bound = curlwp_bind(); 788 struct psref psref; 789 ia = in6ifa_ifpforlinklocal_psref(ifp, 0, &psref); 790 if (ia == NULL && in6_ifattach_linklocal(ifp, altifp) != 0) { 791 printf("%s: cannot assign link-local address\n", 792 ifp->if_xname); 793 } 794 ia6_release(ia, &psref); 795 curlwp_bindx(bound); 796 } 797 } 798 799 /* 800 * NOTE: in6_ifdetach() does not support loopback if at this moment. 801 * We don't need this function in bsdi, because interfaces are never removed 802 * from the ifnet list in bsdi. 803 */ 804 void 805 in6_ifdetach(struct ifnet *ifp) 806 { 807 808 /* nuke any of IPv6 addresses we have */ 809 if_purgeaddrs(ifp, AF_INET6, in6_purgeaddr); 810 811 in6_purge_multi(ifp); 812 813 /* remove ip6_mrouter stuff */ 814 ip6_mrouter_detach(ifp); 815 816 /* remove neighbor management table */ 817 nd6_purge(ifp, NULL); 818 819 nd6_assert_purged(ifp); 820 } 821 822 int 823 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 824 const u_int8_t *baseid, int generate) 825 { 826 u_int8_t nullbuf[8]; 827 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 828 829 memset(nullbuf, 0, sizeof(nullbuf)); 830 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 831 /* we've never created a random ID. Create a new one. */ 832 generate = 1; 833 } 834 835 if (generate) { 836 memcpy(ndi->randomseed1, baseid, sizeof(ndi->randomseed1)); 837 838 /* generate_tmp_ifid will update seedn and buf */ 839 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 840 ndi->randomid); 841 } 842 memcpy(retbuf, ndi->randomid, 8); 843 if (generate && memcmp(retbuf, nullbuf, sizeof(nullbuf)) == 0) { 844 /* generate_tmp_ifid could not found a good ID. */ 845 return -1; 846 } 847 848 return 0; 849 } 850 851 void 852 in6_tmpaddrtimer(void *ignored_arg) 853 { 854 struct nd_ifinfo *ndi; 855 u_int8_t nullbuf[8]; 856 struct ifnet *ifp; 857 int s; 858 859 /* XXX NOMPSAFE still need softnet_lock */ 860 mutex_enter(softnet_lock); 861 KERNEL_LOCK(1, NULL); 862 863 callout_reset(&in6_tmpaddrtimer_ch, 864 (ip6_temp_preferred_lifetime - ip6_desync_factor - 865 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 866 867 memset(nullbuf, 0, sizeof(nullbuf)); 868 s = pserialize_read_enter(); 869 IFNET_READER_FOREACH(ifp) { 870 ndi = ND_IFINFO(ifp); 871 if (memcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 872 /* 873 * We've been generating a random ID on this interface. 874 * Create a new one. 875 */ 876 (void)generate_tmp_ifid(ndi->randomseed0, 877 ndi->randomseed1, ndi->randomid); 878 } 879 } 880 pserialize_read_exit(s); 881 882 KERNEL_UNLOCK_ONE(NULL); 883 mutex_exit(softnet_lock); 884 } 885