1 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */ 2 /* $DragonFly: src/sys/netinet6/in6_ifattach.c,v 1.22 2008/03/07 11:34:21 sephe Exp $ */ 3 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/malloc.h> 37 #include <sys/socket.h> 38 #include <sys/sockio.h> 39 #include <sys/kernel.h> 40 #include <sys/syslog.h> 41 #include <sys/md5.h> 42 #include <sys/thread2.h> 43 44 #include <net/if.h> 45 #include <net/if_dl.h> 46 #include <net/if_types.h> 47 #include <net/route.h> 48 49 #include <netinet/in.h> 50 #include <netinet/in_var.h> 51 #include <netinet/if_ether.h> 52 #include <netinet/in_pcb.h> 53 54 #include <netinet/ip6.h> 55 #include <netinet6/ip6_var.h> 56 #include <netinet6/in6_var.h> 57 #include <netinet6/in6_pcb.h> 58 #include <netinet6/in6_ifattach.h> 59 #include <netinet6/ip6_var.h> 60 #include <netinet6/nd6.h> 61 #include <netinet6/scope6_var.h> 62 63 #include <net/net_osdep.h> 64 65 unsigned long in6_maxmtu = 0; 66 67 #ifdef IP6_AUTO_LINKLOCAL 68 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 69 #else 70 int ip6_auto_linklocal = 1; /* enable by default */ 71 #endif 72 73 struct callout in6_tmpaddrtimer_ch; 74 75 extern struct inpcbinfo udbinfo; 76 extern struct inpcbinfo ripcbinfo; 77 78 static int get_rand_ifid (struct ifnet *, struct in6_addr *); 79 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); 80 static int get_hw_ifid (struct ifnet *, struct in6_addr *); 81 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); 82 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); 83 static int in6_ifattach_loopback (struct ifnet *); 84 85 #define EUI64_GBIT 0x01 86 #define EUI64_UBIT 0x02 87 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 88 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 89 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 90 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 91 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 92 93 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 94 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 95 96 /* 97 * Generate a last-resort interface identifier, when the machine has no 98 * IEEE802/EUI64 address sources. 99 * The goal here is to get an interface identifier that is 100 * (1) random enough and (2) does not change across reboot. 101 * We currently use MD5(hostname) for it. 102 */ 103 static int 104 get_rand_ifid(struct ifnet *ifp, 105 struct in6_addr *in6) /* upper 64bits are preserved */ 106 { 107 MD5_CTX ctxt; 108 u_int8_t digest[16]; 109 int hostnamelen = strlen(hostname); 110 111 #if 0 112 /* we need at least several letters as seed for ifid */ 113 if (hostnamelen < 3) 114 return -1; 115 #endif 116 117 /* generate 8 bytes of pseudo-random value. */ 118 bzero(&ctxt, sizeof(ctxt)); 119 MD5Init(&ctxt); 120 MD5Update(&ctxt, hostname, hostnamelen); 121 MD5Final(digest, &ctxt); 122 123 /* assumes sizeof(digest) > sizeof(ifid) */ 124 bcopy(digest, &in6->s6_addr[8], 8); 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 } 135 136 static int 137 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 138 { 139 MD5_CTX ctxt; 140 u_int8_t seed[16], digest[16], nullbuf[8]; 141 u_int32_t val32; 142 struct timeval tv; 143 144 /* If there's no hisotry, start with a random seed. */ 145 bzero(nullbuf, sizeof(nullbuf)); 146 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 147 int i; 148 149 for (i = 0; i < 2; i++) { 150 microtime(&tv); 151 val32 = krandom() ^ tv.tv_usec; 152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 153 } 154 } else { 155 bcopy(seed0, seed, 8); 156 } 157 158 /* copy the right-most 64-bits of the given address */ 159 /* XXX assumption on the size of IFID */ 160 bcopy(seed1, &seed[8], 8); 161 162 if (0) { /* for debugging purposes only */ 163 int i; 164 165 kprintf("generate_tmp_ifid: new randomized ID from: "); 166 for (i = 0; i < 16; i++) 167 kprintf("%02x", seed[i]); 168 kprintf(" "); 169 } 170 171 /* generate 16 bytes of pseudo-random value. */ 172 bzero(&ctxt, sizeof(ctxt)); 173 MD5Init(&ctxt); 174 MD5Update(&ctxt, seed, sizeof(seed)); 175 MD5Final(digest, &ctxt); 176 177 /* 178 * RFC 3041 3.2.1. (3) 179 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 180 * left-most bit is numbered 0) to zero. 181 */ 182 bcopy(digest, ret, 8); 183 ret[0] &= ~EUI64_UBIT; 184 185 /* 186 * XXX: we'd like to ensure that the generated value is not zero 187 * for simplicity. If the caclculated digest happens to be zero, 188 * use a random non-zero value as the last resort. 189 */ 190 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 191 log(LOG_INFO, 192 "generate_tmp_ifid: computed MD5 value is zero.\n"); 193 194 microtime(&tv); 195 val32 = krandom() ^ tv.tv_usec; 196 val32 = 1 + (val32 % (0xffffffff - 1)); 197 } 198 199 /* 200 * RFC 3041 3.2.1. (4) 201 * Take the rightmost 64-bits of the MD5 digest and save them in 202 * stable storage as the history value to be used in the next 203 * iteration of the algorithm. 204 */ 205 bcopy(&digest[8], seed0, 8); 206 207 if (0) { /* for debugging purposes only */ 208 int i; 209 210 kprintf("to: "); 211 for (i = 0; i < 16; i++) 212 kprintf("%02x", digest[i]); 213 kprintf("\n"); 214 } 215 216 return 0; 217 } 218 219 /* 220 * Get interface identifier for the specified interface. 221 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 222 */ 223 static int 224 get_hw_ifid(struct ifnet *ifp, 225 struct in6_addr *in6) /* upper 64bits are preserved */ 226 { 227 struct ifaddr_container *ifac; 228 struct sockaddr_dl *sdl; 229 u_int8_t *addr; 230 size_t addrlen; 231 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 232 static u_int8_t allone[8] = 233 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 234 235 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 236 struct ifaddr *ifa = ifac->ifa; 237 238 if (ifa->ifa_addr->sa_family != AF_LINK) 239 continue; 240 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 241 if (sdl == NULL) 242 continue; 243 if (sdl->sdl_alen == 0) 244 continue; 245 246 goto found; 247 } 248 249 return -1; 250 251 found: 252 addr = LLADDR(sdl); 253 addrlen = sdl->sdl_alen; 254 255 /* get EUI64 */ 256 switch (ifp->if_type) { 257 case IFT_ETHER: 258 case IFT_ATM: 259 case IFT_IEEE1394: 260 #ifdef IFT_IEEE80211 261 case IFT_IEEE80211: 262 #endif 263 /* IEEE802/EUI64 cases - what others? */ 264 /* IEEE1394 uses 16byte length address starting with EUI64 */ 265 if (addrlen > 8) 266 addrlen = 8; 267 268 /* look at IEEE802/EUI64 only */ 269 if (addrlen != 8 && addrlen != 6) 270 return -1; 271 272 /* 273 * check for invalid MAC address - on bsdi, we see it a lot 274 * since wildboar configures all-zero MAC on pccard before 275 * card insertion. 276 */ 277 if (bcmp(addr, allzero, addrlen) == 0) 278 return -1; 279 if (bcmp(addr, allone, addrlen) == 0) 280 return -1; 281 282 /* make EUI64 address */ 283 if (addrlen == 8) 284 bcopy(addr, &in6->s6_addr[8], 8); 285 else if (addrlen == 6) { 286 in6->s6_addr[8] = addr[0]; 287 in6->s6_addr[9] = addr[1]; 288 in6->s6_addr[10] = addr[2]; 289 in6->s6_addr[11] = 0xff; 290 in6->s6_addr[12] = 0xfe; 291 in6->s6_addr[13] = addr[3]; 292 in6->s6_addr[14] = addr[4]; 293 in6->s6_addr[15] = addr[5]; 294 } 295 break; 296 case IFT_GIF: 297 #ifdef IFT_STF 298 case IFT_STF: 299 #endif 300 /* 301 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 302 * however, IPv4 address is not very suitable as unique 303 * identifier source (can be renumbered). 304 * we don't do this. 305 */ 306 return -1; 307 308 default: 309 return -1; 310 } 311 312 /* sanity check: g bit must not indicate "group" */ 313 if (EUI64_GROUP(in6)) 314 return -1; 315 316 /* convert EUI64 into IPv6 interface identifier */ 317 EUI64_TO_IFID(in6); 318 319 /* 320 * sanity check: ifid must not be all zero, avoid conflict with 321 * subnet router anycast 322 */ 323 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 324 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 325 return -1; 326 } 327 328 return 0; 329 } 330 331 /* 332 * Get interface identifier for the specified interface. If it is not 333 * available on ifp0, borrow interface identifier from other information 334 * sources. 335 */ 336 static int 337 get_ifid(struct ifnet *ifp0, 338 struct ifnet *altifp, /* secondary EUI64 source */ 339 struct in6_addr *in6) 340 { 341 struct ifnet *ifp; 342 343 /* first, try to get it from the interface itself */ 344 if (get_hw_ifid(ifp0, in6) == 0) { 345 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 346 if_name(ifp0))); 347 goto success; 348 } 349 350 /* try secondary EUI64 source. this basically is for ATM PVC */ 351 if (altifp && get_hw_ifid(altifp, in6) == 0) { 352 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 353 if_name(ifp0), if_name(altifp))); 354 goto success; 355 } 356 357 /* next, try to get it from some other hardware interface */ 358 TAILQ_FOREACH(ifp, &ifnet, if_list) { 359 if (ifp == ifp0) 360 continue; 361 if (get_hw_ifid(ifp, in6) != 0) 362 continue; 363 364 /* 365 * to borrow ifid from other interface, ifid needs to be 366 * globally unique 367 */ 368 if (IFID_UNIVERSAL(in6)) { 369 nd6log((LOG_DEBUG, 370 "%s: borrow interface identifier from %s\n", 371 if_name(ifp0), if_name(ifp))); 372 goto success; 373 } 374 } 375 376 /* last resort: get from random number source */ 377 if (get_rand_ifid(ifp, in6) == 0) { 378 nd6log((LOG_DEBUG, 379 "%s: interface identifier generated by random number\n", 380 if_name(ifp0))); 381 goto success; 382 } 383 384 kprintf("%s: failed to get interface identifier\n", if_name(ifp0)); 385 return -1; 386 387 success: 388 nd6log((LOG_INFO, "%s: ifid: " 389 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 390 if_name(ifp0), 391 in6->s6_addr[8], in6->s6_addr[9], 392 in6->s6_addr[10], in6->s6_addr[11], 393 in6->s6_addr[12], in6->s6_addr[13], 394 in6->s6_addr[14], in6->s6_addr[15])); 395 return 0; 396 } 397 398 static int 399 in6_ifattach_linklocal(struct ifnet *ifp, 400 struct ifnet *altifp) /* secondary EUI64 source */ 401 { 402 struct in6_ifaddr *ia; 403 struct in6_aliasreq ifra; 404 struct nd_prefix pr0; 405 int i, error; 406 407 /* 408 * configure link-local address. 409 */ 410 bzero(&ifra, sizeof(ifra)); 411 412 /* 413 * in6_update_ifa() does not use ifra_name, but we accurately set it 414 * for safety. 415 */ 416 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 417 418 ifra.ifra_addr.sin6_family = AF_INET6; 419 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 420 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 421 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 422 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 423 if (ifp->if_flags & IFF_LOOPBACK) { 424 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 425 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 426 } else { 427 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 428 nd6log((LOG_ERR, 429 "%s: no ifid available\n", if_name(ifp))); 430 return -1; 431 } 432 } 433 434 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 435 ifra.ifra_prefixmask.sin6_family = AF_INET6; 436 ifra.ifra_prefixmask.sin6_addr = in6mask64; 437 438 /* link-local addresses should NEVER expire. */ 439 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 440 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 441 442 /* 443 * Do not let in6_update_ifa() do DAD, since we need a random delay 444 * before sending an NS at the first time the interface becomes up. 445 * Instead, in6_if_up() will start DAD with a proper random delay. 446 */ 447 ifra.ifra_flags |= IN6_IFF_NODAD; 448 449 /* 450 * Now call in6_update_ifa() to do a bunch of procedures to configure 451 * a link-local address. We can set NULL to the 3rd argument, because 452 * we know there's no other link-local address on the interface 453 * and therefore we are adding one (instead of updating one). 454 */ 455 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 456 /* 457 * XXX: When the interface does not support IPv6, this call 458 * would fail in the SIOCSIFADDR ioctl. I believe the 459 * notification is rather confusing in this case, so just 460 * supress it. (jinmei@kame.net 20010130) 461 */ 462 if (error != EAFNOSUPPORT) 463 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 464 "configure a link-local address on %s " 465 "(errno=%d)\n", 466 if_name(ifp), error); 467 return (-1); 468 } 469 470 /* 471 * Adjust ia6_flags so that in6_if_up will perform DAD. 472 * XXX: Some P2P interfaces seem not to send packets just after 473 * becoming up, so we skip p2p interfaces for safety. 474 */ 475 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 476 #ifdef DIAGNOSTIC 477 if (!ia) { 478 panic("ia == NULL in in6_ifattach_linklocal"); 479 /* NOTREACHED */ 480 } 481 #endif 482 if (in6if_do_dad(ifp) && !(ifp->if_flags & IFF_POINTOPOINT)) { 483 ia->ia6_flags &= ~IN6_IFF_NODAD; 484 ia->ia6_flags |= IN6_IFF_TENTATIVE; 485 } 486 487 /* 488 * Make the link-local prefix (fe80::/64%link) as on-link. 489 * Since we'd like to manage prefixes separately from addresses, 490 * we make an ND6 prefix structure for the link-local prefix, 491 * and add it to the prefix list as a never-expire prefix. 492 * XXX: this change might affect some existing code base... 493 */ 494 bzero(&pr0, sizeof(pr0)); 495 pr0.ndpr_ifp = ifp; 496 /* this should be 64 at this moment. */ 497 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 498 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 499 pr0.ndpr_prefix = ifra.ifra_addr; 500 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 501 for (i = 0; i < 4; i++) { 502 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 503 in6mask64.s6_addr32[i]; 504 } 505 /* 506 * Initialize parameters. The link-local prefix must always be 507 * on-link, and its lifetimes never expire. 508 */ 509 pr0.ndpr_raf_onlink = 1; 510 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 511 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 512 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 513 /* 514 * Since there is no other link-local addresses, nd6_prefix_lookup() 515 * probably returns NULL. However, we cannot always expect the result. 516 * For example, if we first remove the (only) existing link-local 517 * address, and then reconfigure another one, the prefix is still 518 * valid with referring to the old link-local address. 519 */ 520 if (nd6_prefix_lookup(&pr0) == NULL) { 521 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 522 return (error); 523 } 524 525 return 0; 526 } 527 528 static int 529 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */ 530 { 531 struct in6_aliasreq ifra; 532 int error; 533 534 bzero(&ifra, sizeof(ifra)); 535 536 /* 537 * in6_update_ifa() does not use ifra_name, but we accurately set it 538 * for safety. 539 */ 540 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 541 542 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 543 ifra.ifra_prefixmask.sin6_family = AF_INET6; 544 ifra.ifra_prefixmask.sin6_addr = in6mask128; 545 546 /* 547 * Always initialize ia_dstaddr (= broadcast address) to loopback 548 * address. Follows IPv4 practice - see in_ifinit(). 549 */ 550 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 551 ifra.ifra_dstaddr.sin6_family = AF_INET6; 552 ifra.ifra_dstaddr.sin6_addr = kin6addr_loopback; 553 554 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 555 ifra.ifra_addr.sin6_family = AF_INET6; 556 ifra.ifra_addr.sin6_addr = kin6addr_loopback; 557 558 /* the loopback address should NEVER expire. */ 559 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 560 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 561 562 /* we don't need to perform DAD on loopback interfaces. */ 563 ifra.ifra_flags |= IN6_IFF_NODAD; 564 565 /* skip registration to the prefix list. XXX should be temporary. */ 566 ifra.ifra_flags |= IN6_IFF_NOPFX; 567 568 /* 569 * We are sure that this is a newly assigned address, so we can set 570 * NULL to the 3rd arg. 571 */ 572 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 573 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 574 "the loopback address on %s (errno=%d)\n", 575 if_name(ifp), error); 576 return (-1); 577 } 578 579 return 0; 580 } 581 582 /* 583 * compute NI group address, based on the current hostname setting. 584 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 585 * 586 * when ifp == NULL, the caller is responsible for filling scopeid. 587 */ 588 int 589 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 590 struct in6_addr *in6) 591 { 592 const char *p; 593 u_char *q; 594 MD5_CTX ctxt; 595 u_int8_t digest[16]; 596 char l; 597 char n[64]; /* a single label must not exceed 63 chars */ 598 599 if (!namelen || !name) 600 return -1; 601 602 p = name; 603 while (p && *p && *p != '.' && p - name < namelen) 604 p++; 605 if (p - name > sizeof(n) - 1) 606 return -1; /* label too long */ 607 l = p - name; 608 strncpy(n, name, l); 609 n[(int)l] = '\0'; 610 for (q = n; *q; q++) { 611 if ('A' <= *q && *q <= 'Z') 612 *q = *q - 'A' + 'a'; 613 } 614 615 /* generate 8 bytes of pseudo-random value. */ 616 bzero(&ctxt, sizeof(ctxt)); 617 MD5Init(&ctxt); 618 MD5Update(&ctxt, &l, sizeof(l)); 619 MD5Update(&ctxt, n, l); 620 MD5Final(digest, &ctxt); 621 622 bzero(in6, sizeof(*in6)); 623 in6->s6_addr16[0] = htons(0xff02); 624 if (ifp) 625 in6->s6_addr16[1] = htons(ifp->if_index); 626 in6->s6_addr8[11] = 2; 627 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 628 629 return 0; 630 } 631 632 void 633 in6_nigroup_attach(const char *name, int namelen) 634 { 635 struct ifnet *ifp; 636 struct sockaddr_in6 mltaddr; 637 struct in6_multi *in6m; 638 int error; 639 640 bzero(&mltaddr, sizeof(mltaddr)); 641 mltaddr.sin6_family = AF_INET6; 642 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 643 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 644 return; 645 646 TAILQ_FOREACH(ifp, &ifnet, if_list) { 647 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 648 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 649 if (!in6m) { 650 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 651 nd6log((LOG_ERR, "%s: failed to join %s " 652 "(errno=%d)\n", if_name(ifp), 653 ip6_sprintf(&mltaddr.sin6_addr), 654 error)); 655 } 656 } 657 } 658 } 659 660 void 661 in6_nigroup_detach(const char *name, int namelen) 662 { 663 struct ifnet *ifp; 664 struct sockaddr_in6 mltaddr; 665 struct in6_multi *in6m; 666 667 bzero(&mltaddr, sizeof(mltaddr)); 668 mltaddr.sin6_family = AF_INET6; 669 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 670 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 671 return; 672 673 TAILQ_FOREACH(ifp, &ifnet, if_list) { 674 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 675 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 676 if (in6m) 677 in6_delmulti(in6m); 678 } 679 } 680 681 /* 682 * XXX multiple loopback interface needs more care. for instance, 683 * nodelocal address needs to be configured onto only one of them. 684 * XXX multiple link-local address case 685 */ 686 void 687 in6_ifattach(struct ifnet *ifp, 688 struct ifnet *altifp) /* secondary EUI64 source */ 689 { 690 struct in6_ifaddr *ia; 691 struct in6_addr in6; 692 693 /* some of the interfaces are inherently not IPv6 capable */ 694 switch (ifp->if_type) { 695 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 696 case IFT_BRIDGE: 697 return; 698 #endif 699 case IFT_PFLOG: 700 case IFT_PFSYNC: 701 case IFT_CARP: 702 return; 703 } 704 705 /* 706 * quirks based on interface type 707 */ 708 switch (ifp->if_type) { 709 #ifdef IFT_STF 710 case IFT_STF: 711 /* 712 * 6to4 interface is a very special kind of beast. 713 * no multicast, no linklocal. RFC2529 specifies how to make 714 * linklocals for 6to4 interface, but there's no use and 715 * it is rather harmful to have one. 716 */ 717 goto statinit; 718 #endif 719 default: 720 break; 721 } 722 723 /* 724 * usually, we require multicast capability to the interface 725 */ 726 if (!(ifp->if_flags & IFF_MULTICAST)) { 727 log(LOG_INFO, "in6_ifattach: " 728 "%s is not multicast capable, IPv6 not enabled\n", 729 if_name(ifp)); 730 return; 731 } 732 733 /* 734 * assign loopback address for loopback interface. 735 * XXX multiple loopback interface case. 736 */ 737 if (ifp->if_flags & IFF_LOOPBACK) { 738 in6 = kin6addr_loopback; 739 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 740 if (in6_ifattach_loopback(ifp) != 0) 741 return; 742 } 743 } 744 745 /* 746 * assign a link-local address, if there's none. 747 */ 748 if (ip6_auto_linklocal) { 749 ia = in6ifa_ifpforlinklocal(ifp, 0); 750 if (ia == NULL) { 751 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 752 /* linklocal address assigned */ 753 } else { 754 /* failed to assign linklocal address. bark? */ 755 } 756 } 757 } 758 759 #ifdef IFT_STF /* XXX */ 760 statinit: 761 #endif 762 763 /* update dynamically. */ 764 if (in6_maxmtu < ifp->if_mtu) 765 in6_maxmtu = ifp->if_mtu; 766 } 767 768 /* 769 * NOTE: in6_ifdetach() does not support loopback if at this moment. 770 * We don't need this function in bsdi, because interfaces are never removed 771 * from the ifnet list in bsdi. 772 */ 773 void 774 in6_ifdetach(struct ifnet *ifp) 775 { 776 struct in6_ifaddr *ia, *oia; 777 struct ifaddr_container *ifac, *next; 778 struct rtentry *rt; 779 short rtflags; 780 struct sockaddr_in6 sin6; 781 struct in6_multi *in6m; 782 struct in6_multi *in6m_next; 783 784 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 785 in6_purgeprefix(ifp); 786 787 /* remove neighbor management table */ 788 nd6_purge(ifp); 789 790 /* nuke any of IPv6 addresses we have */ 791 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], ifa_link, next) { 792 struct ifaddr *ifa = ifac->ifa; 793 794 if (ifa->ifa_addr->sa_family != AF_INET6) 795 continue; 796 in6_purgeaddr(ifa); 797 } 798 799 /* undo everything done by in6_ifattach(), just in case */ 800 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], ifa_link, next) { 801 struct ifaddr *ifa = ifac->ifa; 802 803 if (ifa->ifa_addr->sa_family != AF_INET6 804 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 805 continue; 806 } 807 808 ia = (struct in6_ifaddr *)ifa; 809 810 /* remove from the routing table */ 811 if ((ia->ia_flags & IFA_ROUTE) && 812 (rt = rtpurelookup((struct sockaddr *)&ia->ia_addr))) { 813 rtflags = rt->rt_flags; 814 --rt->rt_refcnt; 815 rtrequest(RTM_DELETE, 816 (struct sockaddr *)&ia->ia_addr, 817 (struct sockaddr *)&ia->ia_addr, 818 (struct sockaddr *)&ia->ia_prefixmask, 819 rtflags, (struct rtentry **)0); 820 } 821 822 /* remove from the linked list */ 823 ifa_ifunlink((struct ifaddr *)ia, ifp); 824 825 /* also remove from the IPv6 address chain(itojun&jinmei) */ 826 oia = ia; 827 if (oia == (ia = in6_ifaddr)) 828 in6_ifaddr = ia->ia_next; 829 else { 830 while (ia->ia_next && (ia->ia_next != oia)) 831 ia = ia->ia_next; 832 if (ia->ia_next) 833 ia->ia_next = oia->ia_next; 834 else { 835 nd6log((LOG_ERR, 836 "%s: didn't unlink in6ifaddr from " 837 "list\n", if_name(ifp))); 838 } 839 } 840 841 crit_enter(); /* XXX MP not MP safe */ 842 _IFAFREE(&oia->ia_ifa, 0); 843 crit_exit(); 844 845 ifa_destroy(&ia->ia_ifa); 846 } 847 848 /* leave from all multicast groups joined */ 849 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 850 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 851 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 852 in6m_next = LIST_NEXT(in6m, in6m_entry); 853 if (in6m->in6m_ifp != ifp) 854 continue; 855 in6_delmulti(in6m); 856 in6m = NULL; 857 } 858 859 /* 860 * remove neighbor management table. we call it twice just to make 861 * sure we nuke everything. maybe we need just one call. 862 * XXX: since the first call did not release addresses, some prefixes 863 * might remain. We should call nd6_purge() again to release the 864 * prefixes after removing all addresses above. 865 * (Or can we just delay calling nd6_purge until at this point?) 866 */ 867 nd6_purge(ifp); 868 869 /* remove route to link-local allnodes multicast (ff02::1) */ 870 bzero(&sin6, sizeof(sin6)); 871 sin6.sin6_len = sizeof(struct sockaddr_in6); 872 sin6.sin6_family = AF_INET6; 873 sin6.sin6_addr = kin6addr_linklocal_allnodes; 874 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 875 rt = rtpurelookup((struct sockaddr *)&sin6); 876 if (rt != NULL && rt->rt_ifp == ifp) { 877 --rt->rt_refcnt; 878 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 879 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 880 } 881 } 882 883 void 884 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 885 int generate) 886 { 887 u_int8_t nullbuf[8]; 888 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 889 890 bzero(nullbuf, sizeof(nullbuf)); 891 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 892 /* we've never created a random ID. Create a new one. */ 893 generate = 1; 894 } 895 896 if (generate) { 897 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 898 899 /* generate_tmp_ifid will update seedn and buf */ 900 generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 901 ndi->randomid); 902 } 903 bcopy(ndi->randomid, retbuf, 8); 904 } 905 906 void 907 in6_tmpaddrtimer(void *ignored_arg) 908 { 909 struct nd_ifinfo *ndi; 910 u_int8_t nullbuf[8]; 911 struct ifnet *ifp; 912 913 crit_enter(); 914 915 callout_reset(&in6_tmpaddrtimer_ch, 916 (ip6_temp_preferred_lifetime - ip6_desync_factor - 917 ip6_temp_regen_advance) * hz, 918 in6_tmpaddrtimer, NULL); 919 920 bzero(nullbuf, sizeof(nullbuf)); 921 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 922 ndi = ND_IFINFO(ifp); 923 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 924 /* 925 * We've been generating a random ID on this interface. 926 * Create a new one. 927 */ 928 generate_tmp_ifid(ndi->randomseed0, 929 ndi->randomseed1, 930 ndi->randomid); 931 } 932 } 933 934 crit_exit(); 935 } 936