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sys/netinet6/in6_ifattach.c
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1 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.2.2.6 2002/04/28 05:40:26 suz Exp $ */ 2 /* $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/socket.h> 37 #include <sys/sockio.h> 38 #include <sys/kernel.h> 39 #include <sys/syslog.h> 40 #include <sys/md5.h> 41 #include <sys/thread2.h> 42 43 #include <net/if.h> 44 #include <net/if_dl.h> 45 #include <net/if_types.h> 46 #include <net/route.h> 47 48 #include <netinet/in.h> 49 #include <netinet/in_var.h> 50 #include <netinet/if_ether.h> 51 #include <netinet/in_pcb.h> 52 #include <netinet/udp_var.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/nd6.h> 60 #include <netinet6/scope6_var.h> 61 62 #include <net/net_osdep.h> 63 64 unsigned long in6_maxmtu = 0; 65 66 #ifdef IP6_AUTO_LINKLOCAL 67 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 68 #else 69 int ip6_auto_linklocal = 1; /* enable by default */ 70 #endif 71 72 struct callout in6_tmpaddrtimer_ch; 73 74 extern struct inpcbinfo ripcbinfo; 75 76 static int get_rand_ifid (struct ifnet *, struct in6_addr *); 77 static int generate_tmp_ifid (u_int8_t *, const u_int8_t *, u_int8_t *); 78 static int get_hw_ifid (struct ifnet *, struct in6_addr *); 79 static int get_ifid (struct ifnet *, struct ifnet *, struct in6_addr *); 80 static int in6_ifattach_linklocal (struct ifnet *, struct ifnet *); 81 static int in6_ifattach_loopback (struct ifnet *); 82 83 #define EUI64_GBIT 0x01 84 #define EUI64_UBIT 0x02 85 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 86 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 87 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 88 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 89 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 90 91 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 92 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 93 94 /* 95 * Generate a last-resort interface identifier, when the machine has no 96 * IEEE802/EUI64 address sources. 97 * The goal here is to get an interface identifier that is 98 * (1) random enough and (2) does not change across reboot. 99 * We currently use MD5(hostname) for it. 100 */ 101 static int 102 get_rand_ifid(struct ifnet *ifp, 103 struct in6_addr *in6) /* upper 64bits are preserved */ 104 { 105 MD5_CTX ctxt; 106 u_int8_t digest[16]; 107 int hostnamelen = strlen(hostname); 108 109 #if 0 110 /* we need at least several letters as seed for ifid */ 111 if (hostnamelen < 3) 112 return -1; 113 #endif 114 115 /* generate 8 bytes of pseudo-random value. */ 116 bzero(&ctxt, sizeof(ctxt)); 117 MD5Init(&ctxt); 118 MD5Update(&ctxt, hostname, hostnamelen); 119 MD5Final(digest, &ctxt); 120 121 /* assumes sizeof(digest) > sizeof(ifid) */ 122 bcopy(digest, &in6->s6_addr[8], 8); 123 124 /* make sure to set "u" bit to local, and "g" bit to individual. */ 125 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 126 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 127 128 /* convert EUI64 into IPv6 interface identifier */ 129 EUI64_TO_IFID(in6); 130 131 return 0; 132 } 133 134 static int 135 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 136 { 137 MD5_CTX ctxt; 138 u_int8_t seed[16], digest[16], nullbuf[8]; 139 u_int32_t val32; 140 struct timeval tv; 141 142 /* If there's no hisotry, start with a random seed. */ 143 bzero(nullbuf, sizeof(nullbuf)); 144 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 145 int i; 146 147 for (i = 0; i < 2; i++) { 148 microtime(&tv); 149 val32 = krandom() ^ tv.tv_usec; 150 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 151 } 152 } else { 153 bcopy(seed0, seed, 8); 154 } 155 156 /* copy the right-most 64-bits of the given address */ 157 /* XXX assumption on the size of IFID */ 158 bcopy(seed1, &seed[8], 8); 159 160 if (0) { /* for debugging purposes only */ 161 int i; 162 163 kprintf("generate_tmp_ifid: new randomized ID from: "); 164 for (i = 0; i < 16; i++) 165 kprintf("%02x", seed[i]); 166 kprintf(" "); 167 } 168 169 /* generate 16 bytes of pseudo-random value. */ 170 bzero(&ctxt, sizeof(ctxt)); 171 MD5Init(&ctxt); 172 MD5Update(&ctxt, seed, sizeof(seed)); 173 MD5Final(digest, &ctxt); 174 175 /* 176 * RFC 3041 3.2.1. (3) 177 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 178 * left-most bit is numbered 0) to zero. 179 */ 180 bcopy(digest, ret, 8); 181 ret[0] &= ~EUI64_UBIT; 182 183 /* 184 * XXX: we'd like to ensure that the generated value is not zero 185 * for simplicity. If the caclculated digest happens to be zero, 186 * use a random non-zero value as the last resort. 187 */ 188 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 189 log(LOG_INFO, 190 "generate_tmp_ifid: computed MD5 value is zero.\n"); 191 192 microtime(&tv); 193 val32 = krandom() ^ tv.tv_usec; 194 val32 = 1 + (val32 % (0xffffffff - 1)); 195 } 196 197 /* 198 * RFC 3041 3.2.1. (4) 199 * Take the rightmost 64-bits of the MD5 digest and save them in 200 * stable storage as the history value to be used in the next 201 * iteration of the algorithm. 202 */ 203 bcopy(&digest[8], seed0, 8); 204 205 if (0) { /* for debugging purposes only */ 206 int i; 207 208 kprintf("to: "); 209 for (i = 0; i < 16; i++) 210 kprintf("%02x", digest[i]); 211 kprintf("\n"); 212 } 213 214 return 0; 215 } 216 217 /* 218 * Get interface identifier for the specified interface. 219 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 220 */ 221 static int 222 get_hw_ifid(struct ifnet *ifp, 223 struct in6_addr *in6) /* upper 64bits are preserved */ 224 { 225 struct ifaddr_container *ifac; 226 struct sockaddr_dl *sdl; 227 u_int8_t *addr; 228 size_t addrlen; 229 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 230 static u_int8_t allone[8] = 231 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 232 233 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 234 struct ifaddr *ifa = ifac->ifa; 235 236 if (ifa->ifa_addr->sa_family != AF_LINK) 237 continue; 238 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 239 if (sdl == NULL) 240 continue; 241 if (sdl->sdl_alen == 0) 242 continue; 243 244 goto found; 245 } 246 247 return -1; 248 249 found: 250 addr = LLADDR(sdl); 251 addrlen = sdl->sdl_alen; 252 253 /* get EUI64 */ 254 switch (ifp->if_type) { 255 case IFT_ETHER: 256 case IFT_ATM: 257 case IFT_IEEE1394: 258 #ifdef IFT_IEEE80211 259 case IFT_IEEE80211: 260 #endif 261 /* IEEE802/EUI64 cases - what others? */ 262 /* IEEE1394 uses 16byte length address starting with EUI64 */ 263 if (addrlen > 8) 264 addrlen = 8; 265 266 /* look at IEEE802/EUI64 only */ 267 if (addrlen != 8 && addrlen != 6) 268 return -1; 269 270 /* 271 * check for invalid MAC address - on bsdi, we see it a lot 272 * since wildboar configures all-zero MAC on pccard before 273 * card insertion. 274 */ 275 if (bcmp(addr, allzero, addrlen) == 0) 276 return -1; 277 if (bcmp(addr, allone, addrlen) == 0) 278 return -1; 279 280 /* make EUI64 address */ 281 if (addrlen == 8) 282 bcopy(addr, &in6->s6_addr[8], 8); 283 else if (addrlen == 6) { 284 in6->s6_addr[8] = addr[0]; 285 in6->s6_addr[9] = addr[1]; 286 in6->s6_addr[10] = addr[2]; 287 in6->s6_addr[11] = 0xff; 288 in6->s6_addr[12] = 0xfe; 289 in6->s6_addr[13] = addr[3]; 290 in6->s6_addr[14] = addr[4]; 291 in6->s6_addr[15] = addr[5]; 292 } 293 break; 294 case IFT_GIF: 295 #ifdef IFT_STF 296 case IFT_STF: 297 #endif 298 /* 299 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 300 * however, IPv4 address is not very suitable as unique 301 * identifier source (can be renumbered). 302 * we don't do this. 303 */ 304 return -1; 305 306 default: 307 return -1; 308 } 309 310 /* sanity check: g bit must not indicate "group" */ 311 if (EUI64_GROUP(in6)) 312 return -1; 313 314 /* convert EUI64 into IPv6 interface identifier */ 315 EUI64_TO_IFID(in6); 316 317 /* 318 * sanity check: ifid must not be all zero, avoid conflict with 319 * subnet router anycast 320 */ 321 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 322 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 323 return -1; 324 } 325 326 return 0; 327 } 328 329 /* 330 * Get interface identifier for the specified interface. If it is not 331 * available on ifp0, borrow interface identifier from other information 332 * sources. 333 */ 334 static int 335 get_ifid(struct ifnet *ifp0, 336 struct ifnet *altifp, /* secondary EUI64 source */ 337 struct in6_addr *in6) 338 { 339 struct ifnet *ifp; 340 341 /* first, try to get it from the interface itself */ 342 if (get_hw_ifid(ifp0, in6) == 0) { 343 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 344 if_name(ifp0))); 345 goto success; 346 } 347 348 /* try secondary EUI64 source. this basically is for ATM PVC */ 349 if (altifp && get_hw_ifid(altifp, in6) == 0) { 350 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 351 if_name(ifp0), if_name(altifp))); 352 goto success; 353 } 354 355 /* next, try to get it from some other hardware interface */ 356 TAILQ_FOREACH(ifp, &ifnet, if_list) { 357 if (ifp == ifp0) 358 continue; 359 if (get_hw_ifid(ifp, in6) != 0) 360 continue; 361 362 /* 363 * to borrow ifid from other interface, ifid needs to be 364 * globally unique 365 */ 366 if (IFID_UNIVERSAL(in6)) { 367 nd6log((LOG_DEBUG, 368 "%s: borrow interface identifier from %s\n", 369 if_name(ifp0), if_name(ifp))); 370 goto success; 371 } 372 } 373 374 /* last resort: get from random number source */ 375 if (get_rand_ifid(ifp, in6) == 0) { 376 nd6log((LOG_DEBUG, 377 "%s: interface identifier generated by random number\n", 378 if_name(ifp0))); 379 goto success; 380 } 381 382 kprintf("%s: failed to get interface identifier\n", if_name(ifp0)); 383 return -1; 384 385 success: 386 nd6log((LOG_INFO, "%s: ifid: " 387 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 388 if_name(ifp0), 389 in6->s6_addr[8], in6->s6_addr[9], 390 in6->s6_addr[10], in6->s6_addr[11], 391 in6->s6_addr[12], in6->s6_addr[13], 392 in6->s6_addr[14], in6->s6_addr[15])); 393 return 0; 394 } 395 396 static int 397 in6_ifattach_linklocal(struct ifnet *ifp, 398 struct ifnet *altifp) /* secondary EUI64 source */ 399 { 400 struct in6_ifaddr *ia; 401 struct in6_aliasreq ifra; 402 struct nd_prefix pr0; 403 int i, error; 404 405 /* 406 * configure link-local address. 407 */ 408 bzero(&ifra, sizeof(ifra)); 409 410 /* 411 * in6_update_ifa() does not use ifra_name, but we accurately set it 412 * for safety. 413 */ 414 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 415 416 ifra.ifra_addr.sin6_family = AF_INET6; 417 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 418 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 419 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 420 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 421 if (ifp->if_flags & IFF_LOOPBACK) { 422 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 423 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 424 } else { 425 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 426 nd6log((LOG_ERR, 427 "%s: no ifid available\n", if_name(ifp))); 428 return -1; 429 } 430 } 431 432 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 433 ifra.ifra_prefixmask.sin6_family = AF_INET6; 434 ifra.ifra_prefixmask.sin6_addr = in6mask64; 435 436 /* link-local addresses should NEVER expire. */ 437 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 438 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 439 440 /* 441 * Do not let in6_update_ifa() do DAD, since we need a random delay 442 * before sending an NS at the first time the interface becomes up. 443 * Instead, in6_if_up() will start DAD with a proper random delay. 444 */ 445 ifra.ifra_flags |= IN6_IFF_NODAD; 446 447 /* 448 * Now call in6_update_ifa() to do a bunch of procedures to configure 449 * a link-local address. We can set NULL to the 3rd argument, because 450 * we know there's no other link-local address on the interface 451 * and therefore we are adding one (instead of updating one). 452 */ 453 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 454 /* 455 * XXX: When the interface does not support IPv6, this call 456 * would fail in the SIOCSIFADDR ioctl. I believe the 457 * notification is rather confusing in this case, so just 458 * supress it. (jinmei@kame.net 20010130) 459 */ 460 if (error != EAFNOSUPPORT) 461 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 462 "configure a link-local address on %s " 463 "(errno=%d)\n", 464 if_name(ifp), error); 465 return (-1); 466 } 467 468 /* 469 * Adjust ia6_flags so that in6_if_up will perform DAD. 470 * XXX: Some P2P interfaces seem not to send packets just after 471 * becoming up, so we skip p2p interfaces for safety. 472 */ 473 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 474 #ifdef DIAGNOSTIC 475 if (!ia) { 476 panic("ia == NULL in in6_ifattach_linklocal"); 477 /* NOTREACHED */ 478 } 479 #endif 480 if (in6if_do_dad(ifp) && !(ifp->if_flags & IFF_POINTOPOINT)) { 481 ia->ia6_flags &= ~IN6_IFF_NODAD; 482 ia->ia6_flags |= IN6_IFF_TENTATIVE; 483 } 484 485 /* 486 * Make the link-local prefix (fe80::/64%link) as on-link. 487 * Since we'd like to manage prefixes separately from addresses, 488 * we make an ND6 prefix structure for the link-local prefix, 489 * and add it to the prefix list as a never-expire prefix. 490 * XXX: this change might affect some existing code base... 491 */ 492 bzero(&pr0, sizeof(pr0)); 493 pr0.ndpr_ifp = ifp; 494 /* this should be 64 at this moment. */ 495 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 496 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 497 pr0.ndpr_prefix = ifra.ifra_addr; 498 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 499 for (i = 0; i < 4; i++) { 500 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 501 in6mask64.s6_addr32[i]; 502 } 503 /* 504 * Initialize parameters. The link-local prefix must always be 505 * on-link, and its lifetimes never expire. 506 */ 507 pr0.ndpr_raf_onlink = 1; 508 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 509 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 510 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 511 /* 512 * Since there is no other link-local addresses, nd6_prefix_lookup() 513 * probably returns NULL. However, we cannot always expect the result. 514 * For example, if we first remove the (only) existing link-local 515 * address, and then reconfigure another one, the prefix is still 516 * valid with referring to the old link-local address. 517 */ 518 if (nd6_prefix_lookup(&pr0) == NULL) { 519 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 520 return (error); 521 } 522 523 return 0; 524 } 525 526 static int 527 in6_ifattach_loopback(struct ifnet *ifp) /* must be IFT_LOOP */ 528 { 529 struct in6_aliasreq ifra; 530 int error; 531 532 bzero(&ifra, sizeof(ifra)); 533 534 /* 535 * in6_update_ifa() does not use ifra_name, but we accurately set it 536 * for safety. 537 */ 538 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 539 540 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 541 ifra.ifra_prefixmask.sin6_family = AF_INET6; 542 ifra.ifra_prefixmask.sin6_addr = in6mask128; 543 544 /* 545 * Always initialize ia_dstaddr (= broadcast address) to loopback 546 * address. Follows IPv4 practice - see in_ifinit(). 547 */ 548 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 549 ifra.ifra_dstaddr.sin6_family = AF_INET6; 550 ifra.ifra_dstaddr.sin6_addr = kin6addr_loopback; 551 552 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 553 ifra.ifra_addr.sin6_family = AF_INET6; 554 ifra.ifra_addr.sin6_addr = kin6addr_loopback; 555 556 /* the loopback address should NEVER expire. */ 557 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 558 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 559 560 /* we don't need to perform DAD on loopback interfaces. */ 561 ifra.ifra_flags |= IN6_IFF_NODAD; 562 563 /* skip registration to the prefix list. XXX should be temporary. */ 564 ifra.ifra_flags |= IN6_IFF_NOPFX; 565 566 /* 567 * We are sure that this is a newly assigned address, so we can set 568 * NULL to the 3rd arg. 569 */ 570 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 571 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 572 "the loopback address on %s (errno=%d)\n", 573 if_name(ifp), error); 574 return (-1); 575 } 576 577 return 0; 578 } 579 580 /* 581 * compute NI group address, based on the current hostname setting. 582 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 583 * 584 * when ifp == NULL, the caller is responsible for filling scopeid. 585 */ 586 int 587 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 588 struct in6_addr *in6) 589 { 590 const char *p; 591 u_char *q; 592 MD5_CTX ctxt; 593 u_int8_t digest[16]; 594 char l; 595 char n[64]; /* a single label must not exceed 63 chars */ 596 597 if (!namelen || !name) 598 return -1; 599 600 p = name; 601 while (p && *p && *p != '.' && p - name < namelen) 602 p++; 603 if (p - name > sizeof(n) - 1) 604 return -1; /* label too long */ 605 l = p - name; 606 strncpy(n, name, l); 607 n[(int)l] = '\0'; 608 for (q = n; *q; q++) { 609 if ('A' <= *q && *q <= 'Z') 610 *q = *q - 'A' + 'a'; 611 } 612 613 /* generate 8 bytes of pseudo-random value. */ 614 bzero(&ctxt, sizeof(ctxt)); 615 MD5Init(&ctxt); 616 MD5Update(&ctxt, &l, sizeof(l)); 617 MD5Update(&ctxt, n, l); 618 MD5Final(digest, &ctxt); 619 620 bzero(in6, sizeof(*in6)); 621 in6->s6_addr16[0] = htons(0xff02); 622 if (ifp) 623 in6->s6_addr16[1] = htons(ifp->if_index); 624 in6->s6_addr8[11] = 2; 625 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 626 627 return 0; 628 } 629 630 void 631 in6_nigroup_attach(const char *name, int namelen) 632 { 633 struct ifnet *ifp; 634 struct sockaddr_in6 mltaddr; 635 struct in6_multi *in6m; 636 int error; 637 638 bzero(&mltaddr, sizeof(mltaddr)); 639 mltaddr.sin6_family = AF_INET6; 640 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 641 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 642 return; 643 644 TAILQ_FOREACH(ifp, &ifnet, if_list) { 645 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 646 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 647 if (!in6m) { 648 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 649 nd6log((LOG_ERR, "%s: failed to join %s " 650 "(errno=%d)\n", if_name(ifp), 651 ip6_sprintf(&mltaddr.sin6_addr), 652 error)); 653 } 654 } 655 } 656 } 657 658 void 659 in6_nigroup_detach(const char *name, int namelen) 660 { 661 struct ifnet *ifp; 662 struct sockaddr_in6 mltaddr; 663 struct in6_multi *in6m; 664 665 bzero(&mltaddr, sizeof(mltaddr)); 666 mltaddr.sin6_family = AF_INET6; 667 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 668 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 669 return; 670 671 TAILQ_FOREACH(ifp, &ifnet, if_list) { 672 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 673 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 674 if (in6m) 675 in6_delmulti(in6m); 676 } 677 } 678 679 /* 680 * XXX multiple loopback interface needs more care. for instance, 681 * nodelocal address needs to be configured onto only one of them. 682 * XXX multiple link-local address case 683 */ 684 void 685 in6_ifattach(struct ifnet *ifp, 686 struct ifnet *altifp) /* secondary EUI64 source */ 687 { 688 struct in6_ifaddr *ia; 689 struct in6_addr in6; 690 691 /* some of the interfaces are inherently not IPv6 capable */ 692 switch (ifp->if_type) { 693 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 694 case IFT_BRIDGE: 695 return; 696 #endif 697 case IFT_PFLOG: 698 case IFT_PFSYNC: 699 case IFT_CARP: 700 return; 701 } 702 703 /* 704 * quirks based on interface type 705 */ 706 switch (ifp->if_type) { 707 #ifdef IFT_STF 708 case IFT_STF: 709 /* 710 * 6to4 interface is a very special kind of beast. 711 * no multicast, no linklocal. RFC2529 specifies how to make 712 * linklocals for 6to4 interface, but there's no use and 713 * it is rather harmful to have one. 714 */ 715 goto statinit; 716 #endif 717 default: 718 break; 719 } 720 721 /* 722 * usually, we require multicast capability to the interface 723 */ 724 if (!(ifp->if_flags & IFF_MULTICAST)) { 725 log(LOG_INFO, "in6_ifattach: " 726 "%s is not multicast capable, IPv6 not enabled\n", 727 if_name(ifp)); 728 return; 729 } 730 731 /* 732 * assign loopback address for loopback interface. 733 * XXX multiple loopback interface case. 734 */ 735 if (ifp->if_flags & IFF_LOOPBACK) { 736 in6 = kin6addr_loopback; 737 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 738 if (in6_ifattach_loopback(ifp) != 0) 739 return; 740 } 741 } 742 743 /* 744 * assign a link-local address, if there's none. 745 */ 746 if (ip6_auto_linklocal) { 747 ia = in6ifa_ifpforlinklocal(ifp, 0); 748 if (ia == NULL) { 749 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 750 /* linklocal address assigned */ 751 } else { 752 /* failed to assign linklocal address. bark? */ 753 } 754 } 755 } 756 757 #ifdef IFT_STF /* XXX */ 758 statinit: 759 #endif 760 761 /* update dynamically. */ 762 if (in6_maxmtu < ifp->if_mtu) 763 in6_maxmtu = ifp->if_mtu; 764 } 765 766 /* 767 * NOTE: in6_ifdetach() does not support loopback if at this moment. 768 * We don't need this function in bsdi, because interfaces are never removed 769 * from the ifnet list in bsdi. 770 */ 771 void 772 in6_ifdetach(struct ifnet *ifp) 773 { 774 struct in6_ifaddr *ia, *oia; 775 struct ifaddr_container *ifac, *next; 776 struct rtentry *rt; 777 short rtflags; 778 struct sockaddr_in6 sin6; 779 struct in6_multi *in6m; 780 struct in6_multi *in6m_next; 781 782 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 783 in6_purgeprefix(ifp); 784 785 /* remove neighbor management table */ 786 nd6_purge(ifp); 787 788 /* nuke any of IPv6 addresses we have */ 789 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], ifa_link, next) { 790 struct ifaddr *ifa = ifac->ifa; 791 792 if (ifa->ifa_addr->sa_family != AF_INET6) 793 continue; 794 in6_purgeaddr(ifa); 795 } 796 797 /* undo everything done by in6_ifattach(), just in case */ 798 TAILQ_FOREACH_MUTABLE(ifac, &ifp->if_addrheads[mycpuid], ifa_link, next) { 799 struct ifaddr *ifa = ifac->ifa; 800 801 if (ifa->ifa_addr->sa_family != AF_INET6 802 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 803 continue; 804 } 805 806 ia = (struct in6_ifaddr *)ifa; 807 808 /* remove from the routing table */ 809 if ((ia->ia_flags & IFA_ROUTE) && 810 (rt = rtpurelookup((struct sockaddr *)&ia->ia_addr))) { 811 rtflags = rt->rt_flags; 812 --rt->rt_refcnt; 813 rtrequest(RTM_DELETE, 814 (struct sockaddr *)&ia->ia_addr, 815 (struct sockaddr *)&ia->ia_addr, 816 (struct sockaddr *)&ia->ia_prefixmask, 817 rtflags, NULL); 818 } 819 820 /* remove from the linked list */ 821 ifa_ifunlink((struct ifaddr *)ia, ifp); 822 823 /* also remove from the IPv6 address chain(itojun&jinmei) */ 824 oia = ia; 825 if (oia == (ia = in6_ifaddr)) 826 in6_ifaddr = ia->ia_next; 827 else { 828 while (ia->ia_next && (ia->ia_next != oia)) 829 ia = ia->ia_next; 830 if (ia->ia_next) 831 ia->ia_next = oia->ia_next; 832 else { 833 nd6log((LOG_ERR, 834 "%s: didn't unlink in6ifaddr from " 835 "list\n", if_name(ifp))); 836 } 837 } 838 839 crit_enter(); /* XXX MP not MP safe */ 840 _IFAFREE(&oia->ia_ifa, 0); 841 crit_exit(); 842 843 ifa_destroy(&ia->ia_ifa); 844 } 845 846 /* leave from all multicast groups joined */ 847 udbinfo_lock(); 848 in6_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp); 849 udbinfo_unlock(); 850 851 in6_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp); 852 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 853 in6m_next = LIST_NEXT(in6m, in6m_entry); 854 if (in6m->in6m_ifp != ifp) 855 continue; 856 in6_delmulti(in6m); 857 in6m = NULL; 858 } 859 860 /* 861 * remove neighbor management table. we call it twice just to make 862 * sure we nuke everything. maybe we need just one call. 863 * XXX: since the first call did not release addresses, some prefixes 864 * might remain. We should call nd6_purge() again to release the 865 * prefixes after removing all addresses above. 866 * (Or can we just delay calling nd6_purge until at this point?) 867 */ 868 nd6_purge(ifp); 869 870 /* remove route to link-local allnodes multicast (ff02::1) */ 871 bzero(&sin6, sizeof(sin6)); 872 sin6.sin6_len = sizeof(struct sockaddr_in6); 873 sin6.sin6_family = AF_INET6; 874 sin6.sin6_addr = kin6addr_linklocal_allnodes; 875 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 876 rt = rtpurelookup((struct sockaddr *)&sin6); 877 if (rt != NULL && rt->rt_ifp == ifp) { 878 --rt->rt_refcnt; 879 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 880 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 881 } 882 } 883 884 void 885 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, const u_int8_t *baseid, 886 int generate) 887 { 888 u_int8_t nullbuf[8]; 889 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 890 891 bzero(nullbuf, sizeof(nullbuf)); 892 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 893 /* we've never created a random ID. Create a new one. */ 894 generate = 1; 895 } 896 897 if (generate) { 898 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 899 900 /* generate_tmp_ifid will update seedn and buf */ 901 generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 902 ndi->randomid); 903 } 904 bcopy(ndi->randomid, retbuf, 8); 905 } 906 907 void 908 in6_tmpaddrtimer(void *ignored_arg) 909 { 910 struct nd_ifinfo *ndi; 911 u_int8_t nullbuf[8]; 912 struct ifnet *ifp; 913 914 crit_enter(); 915 916 callout_reset(&in6_tmpaddrtimer_ch, 917 (ip6_temp_preferred_lifetime - ip6_desync_factor - 918 ip6_temp_regen_advance) * hz, 919 in6_tmpaddrtimer, NULL); 920 921 bzero(nullbuf, sizeof(nullbuf)); 922 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 923 if (ifp->if_afdata[AF_INET6] == NULL) 924 continue; 925 ndi = ND_IFINFO(ifp); 926 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 927 /* 928 * We've been generating a random ID on this interface. 929 * Create a new one. 930 */ 931 generate_tmp_ifid(ndi->randomseed0, 932 ndi->randomseed1, 933 ndi->randomid); 934 } 935 } 936 937 crit_exit(); 938 }
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