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sys/netinet6/in6_ifattach.c
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1 /* $FreeBSD: releng/5.1/sys/netinet6/in6_ifattach.c 111119 2003-02-19 05:47:46Z imp $ */ 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 42 #include <net/if.h> 43 #include <net/if_dl.h> 44 #include <net/if_types.h> 45 #include <net/route.h> 46 47 #include <netinet/in.h> 48 #include <netinet/in_var.h> 49 #include <netinet/if_ether.h> 50 #include <netinet/in_pcb.h> 51 52 #include <netinet/ip6.h> 53 #include <netinet6/ip6_var.h> 54 #include <netinet6/in6_var.h> 55 #include <netinet6/in6_pcb.h> 56 #include <netinet6/in6_ifattach.h> 57 #include <netinet6/ip6_var.h> 58 #include <netinet6/nd6.h> 59 #include <netinet6/scope6_var.h> 60 61 #include <net/net_osdep.h> 62 63 struct in6_ifstat **in6_ifstat = NULL; 64 struct icmp6_ifstat **icmp6_ifstat = NULL; 65 size_t in6_ifstatmax = 0; 66 size_t icmp6_ifstatmax = 0; 67 unsigned long in6_maxmtu = 0; 68 69 #ifdef IP6_AUTO_LINKLOCAL 70 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 71 #else 72 int ip6_auto_linklocal = 1; /* enable by default */ 73 #endif 74 75 struct callout in6_tmpaddrtimer_ch; 76 77 extern struct inpcbinfo udbinfo; 78 extern struct inpcbinfo ripcbinfo; 79 80 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 81 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); 82 static int get_hw_ifid __P((struct ifnet *, struct in6_addr *)); 83 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 84 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 85 static int in6_ifattach_loopback __P((struct ifnet *)); 86 87 #define EUI64_GBIT 0x01 88 #define EUI64_UBIT 0x02 89 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 90 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 91 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 92 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 93 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 94 95 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 96 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 97 98 /* 99 * Generate a last-resort interface identifier, when the machine has no 100 * IEEE802/EUI64 address sources. 101 * The goal here is to get an interface identifier that is 102 * (1) random enough and (2) does not change across reboot. 103 * We currently use MD5(hostname) for it. 104 */ 105 static int 106 get_rand_ifid(ifp, in6) 107 struct ifnet *ifp; 108 struct in6_addr *in6; /* upper 64bits are preserved */ 109 { 110 MD5_CTX ctxt; 111 u_int8_t digest[16]; 112 int hostnamelen = strlen(hostname); 113 114 #if 0 115 /* we need at least several letters as seed for ifid */ 116 if (hostnamelen < 3) 117 return -1; 118 #endif 119 120 /* generate 8 bytes of pseudo-random value. */ 121 bzero(&ctxt, sizeof(ctxt)); 122 MD5Init(&ctxt); 123 MD5Update(&ctxt, hostname, hostnamelen); 124 MD5Final(digest, &ctxt); 125 126 /* assumes sizeof(digest) > sizeof(ifid) */ 127 bcopy(digest, &in6->s6_addr[8], 8); 128 129 /* make sure to set "u" bit to local, and "g" bit to individual. */ 130 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 131 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 132 133 /* convert EUI64 into IPv6 interface identifier */ 134 EUI64_TO_IFID(in6); 135 136 return 0; 137 } 138 139 static int 140 generate_tmp_ifid(seed0, seed1, ret) 141 u_int8_t *seed0, *ret; 142 const u_int8_t *seed1; 143 { 144 MD5_CTX ctxt; 145 u_int8_t seed[16], digest[16], nullbuf[8]; 146 u_int32_t val32; 147 struct timeval tv; 148 149 /* If there's no hisotry, start with a random seed. */ 150 bzero(nullbuf, sizeof(nullbuf)); 151 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 152 int i; 153 154 for (i = 0; i < 2; i++) { 155 microtime(&tv); 156 val32 = random() ^ tv.tv_usec; 157 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 158 } 159 } else { 160 bcopy(seed0, seed, 8); 161 } 162 163 /* copy the right-most 64-bits of the given address */ 164 /* XXX assumption on the size of IFID */ 165 bcopy(seed1, &seed[8], 8); 166 167 if (0) { /* for debugging purposes only */ 168 int i; 169 170 printf("generate_tmp_ifid: new randomized ID from: "); 171 for (i = 0; i < 16; i++) 172 printf("%02x", seed[i]); 173 printf(" "); 174 } 175 176 /* generate 16 bytes of pseudo-random value. */ 177 bzero(&ctxt, sizeof(ctxt)); 178 MD5Init(&ctxt); 179 MD5Update(&ctxt, seed, sizeof(seed)); 180 MD5Final(digest, &ctxt); 181 182 /* 183 * RFC 3041 3.2.1. (3) 184 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 185 * left-most bit is numbered 0) to zero. 186 */ 187 bcopy(digest, ret, 8); 188 ret[0] &= ~EUI64_UBIT; 189 190 /* 191 * XXX: we'd like to ensure that the generated value is not zero 192 * for simplicity. If the caclculated digest happens to be zero, 193 * use a random non-zero value as the last resort. 194 */ 195 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 196 log(LOG_INFO, 197 "generate_tmp_ifid: computed MD5 value is zero.\n"); 198 199 microtime(&tv); 200 val32 = random() ^ tv.tv_usec; 201 val32 = 1 + (val32 % (0xffffffff - 1)); 202 } 203 204 /* 205 * RFC 3041 3.2.1. (4) 206 * Take the rightmost 64-bits of the MD5 digest and save them in 207 * stable storage as the history value to be used in the next 208 * iteration of the algorithm. 209 */ 210 bcopy(&digest[8], seed0, 8); 211 212 if (0) { /* for debugging purposes only */ 213 int i; 214 215 printf("to: "); 216 for (i = 0; i < 16; i++) 217 printf("%02x", digest[i]); 218 printf("\n"); 219 } 220 221 return 0; 222 } 223 224 /* 225 * Get interface identifier for the specified interface. 226 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 227 */ 228 static int 229 get_hw_ifid(ifp, in6) 230 struct ifnet *ifp; 231 struct in6_addr *in6; /* upper 64bits are preserved */ 232 { 233 struct ifaddr *ifa; 234 struct sockaddr_dl *sdl; 235 u_int8_t *addr; 236 size_t addrlen; 237 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 238 static u_int8_t allone[8] = 239 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 240 241 for (ifa = ifp->if_addrlist.tqh_first; 242 ifa; 243 ifa = ifa->ifa_list.tqe_next) 244 { 245 if (ifa->ifa_addr->sa_family != AF_LINK) 246 continue; 247 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 248 if (sdl == NULL) 249 continue; 250 if (sdl->sdl_alen == 0) 251 continue; 252 253 goto found; 254 } 255 256 return -1; 257 258 found: 259 addr = LLADDR(sdl); 260 addrlen = sdl->sdl_alen; 261 262 /* get EUI64 */ 263 switch (ifp->if_type) { 264 case IFT_ETHER: 265 case IFT_FDDI: 266 case IFT_ATM: 267 case IFT_IEEE1394: 268 #ifdef IFT_IEEE80211 269 case IFT_IEEE80211: 270 #endif 271 /* IEEE802/EUI64 cases - what others? */ 272 /* IEEE1394 uses 16byte length address starting with EUI64 */ 273 if (addrlen > 8) 274 addrlen = 8; 275 276 /* look at IEEE802/EUI64 only */ 277 if (addrlen != 8 && addrlen != 6) 278 return -1; 279 280 /* 281 * check for invalid MAC address - on bsdi, we see it a lot 282 * since wildboar configures all-zero MAC on pccard before 283 * card insertion. 284 */ 285 if (bcmp(addr, allzero, addrlen) == 0) 286 return -1; 287 if (bcmp(addr, allone, addrlen) == 0) 288 return -1; 289 290 /* make EUI64 address */ 291 if (addrlen == 8) 292 bcopy(addr, &in6->s6_addr[8], 8); 293 else if (addrlen == 6) { 294 in6->s6_addr[8] = addr[0]; 295 in6->s6_addr[9] = addr[1]; 296 in6->s6_addr[10] = addr[2]; 297 in6->s6_addr[11] = 0xff; 298 in6->s6_addr[12] = 0xfe; 299 in6->s6_addr[13] = addr[3]; 300 in6->s6_addr[14] = addr[4]; 301 in6->s6_addr[15] = addr[5]; 302 } 303 break; 304 305 case IFT_ARCNET: 306 if (addrlen != 1) 307 return -1; 308 if (!addr[0]) 309 return -1; 310 311 bzero(&in6->s6_addr[8], 8); 312 in6->s6_addr[15] = addr[0]; 313 314 /* 315 * due to insufficient bitwidth, we mark it local. 316 */ 317 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 318 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 319 break; 320 321 case IFT_GIF: 322 #ifdef IFT_STF 323 case IFT_STF: 324 #endif 325 /* 326 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 327 * however, IPv4 address is not very suitable as unique 328 * identifier source (can be renumbered). 329 * we don't do this. 330 */ 331 return -1; 332 333 default: 334 return -1; 335 } 336 337 /* sanity check: g bit must not indicate "group" */ 338 if (EUI64_GROUP(in6)) 339 return -1; 340 341 /* convert EUI64 into IPv6 interface identifier */ 342 EUI64_TO_IFID(in6); 343 344 /* 345 * sanity check: ifid must not be all zero, avoid conflict with 346 * subnet router anycast 347 */ 348 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 349 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 350 return -1; 351 } 352 353 return 0; 354 } 355 356 /* 357 * Get interface identifier for the specified interface. If it is not 358 * available on ifp0, borrow interface identifier from other information 359 * sources. 360 */ 361 static int 362 get_ifid(ifp0, altifp, in6) 363 struct ifnet *ifp0; 364 struct ifnet *altifp; /* secondary EUI64 source */ 365 struct in6_addr *in6; 366 { 367 struct ifnet *ifp; 368 369 /* first, try to get it from the interface itself */ 370 if (get_hw_ifid(ifp0, in6) == 0) { 371 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 372 if_name(ifp0))); 373 goto success; 374 } 375 376 /* try secondary EUI64 source. this basically is for ATM PVC */ 377 if (altifp && get_hw_ifid(altifp, in6) == 0) { 378 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 379 if_name(ifp0), if_name(altifp))); 380 goto success; 381 } 382 383 /* next, try to get it from some other hardware interface */ 384 IFNET_RLOCK(); 385 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 386 { 387 if (ifp == ifp0) 388 continue; 389 if (get_hw_ifid(ifp, in6) != 0) 390 continue; 391 392 /* 393 * to borrow ifid from other interface, ifid needs to be 394 * globally unique 395 */ 396 if (IFID_UNIVERSAL(in6)) { 397 nd6log((LOG_DEBUG, 398 "%s: borrow interface identifier from %s\n", 399 if_name(ifp0), if_name(ifp))); 400 IFNET_RUNLOCK(); 401 goto success; 402 } 403 } 404 IFNET_RUNLOCK(); 405 406 /* last resort: get from random number source */ 407 if (get_rand_ifid(ifp, in6) == 0) { 408 nd6log((LOG_DEBUG, 409 "%s: interface identifier generated by random number\n", 410 if_name(ifp0))); 411 goto success; 412 } 413 414 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 415 return -1; 416 417 success: 418 nd6log((LOG_INFO, "%s: ifid: " 419 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 420 if_name(ifp0), 421 in6->s6_addr[8], in6->s6_addr[9], 422 in6->s6_addr[10], in6->s6_addr[11], 423 in6->s6_addr[12], in6->s6_addr[13], 424 in6->s6_addr[14], in6->s6_addr[15])); 425 return 0; 426 } 427 428 static int 429 in6_ifattach_linklocal(ifp, altifp) 430 struct ifnet *ifp; 431 struct ifnet *altifp; /* secondary EUI64 source */ 432 { 433 struct in6_ifaddr *ia; 434 struct in6_aliasreq ifra; 435 struct nd_prefix pr0; 436 int i, error; 437 438 /* 439 * configure link-local address. 440 */ 441 bzero(&ifra, sizeof(ifra)); 442 443 /* 444 * in6_update_ifa() does not use ifra_name, but we accurately set it 445 * for safety. 446 */ 447 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 448 449 ifra.ifra_addr.sin6_family = AF_INET6; 450 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 451 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 452 #ifdef SCOPEDROUTING 453 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 454 #else 455 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 456 #endif 457 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 458 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 459 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 460 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 461 } else { 462 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 463 nd6log((LOG_ERR, 464 "%s: no ifid available\n", if_name(ifp))); 465 return -1; 466 } 467 } 468 #ifdef SCOPEDROUTING 469 ifra.ifra_addr.sin6_scope_id = 470 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 471 #endif 472 473 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 474 ifra.ifra_prefixmask.sin6_family = AF_INET6; 475 ifra.ifra_prefixmask.sin6_addr = in6mask64; 476 #ifdef SCOPEDROUTING 477 /* take into accound the sin6_scope_id field for routing */ 478 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 479 #endif 480 /* link-local addresses should NEVER expire. */ 481 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 482 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 483 484 /* 485 * Do not let in6_update_ifa() do DAD, since we need a random delay 486 * before sending an NS at the first time the interface becomes up. 487 * Instead, in6_if_up() will start DAD with a proper random delay. 488 */ 489 ifra.ifra_flags |= IN6_IFF_NODAD; 490 491 /* 492 * Now call in6_update_ifa() to do a bunch of procedures to configure 493 * a link-local address. We can set NULL to the 3rd argument, because 494 * we know there's no other link-local address on the interface 495 * and therefore we are adding one (instead of updating one). 496 */ 497 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 498 /* 499 * XXX: When the interface does not support IPv6, this call 500 * would fail in the SIOCSIFADDR ioctl. I believe the 501 * notification is rather confusing in this case, so just 502 * supress it. (jinmei@kame.net 20010130) 503 */ 504 if (error != EAFNOSUPPORT) 505 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 506 "configure a link-local address on %s " 507 "(errno=%d)\n", 508 if_name(ifp), error); 509 return(-1); 510 } 511 512 /* 513 * Adjust ia6_flags so that in6_if_up will perform DAD. 514 * XXX: Some P2P interfaces seem not to send packets just after 515 * becoming up, so we skip p2p interfaces for safety. 516 */ 517 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 518 #ifdef DIAGNOSTIC 519 if (!ia) { 520 panic("ia == NULL in in6_ifattach_linklocal"); 521 /* NOTREACHED */ 522 } 523 #endif 524 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 525 ia->ia6_flags &= ~IN6_IFF_NODAD; 526 ia->ia6_flags |= IN6_IFF_TENTATIVE; 527 } 528 529 /* 530 * Make the link-local prefix (fe80::/64%link) as on-link. 531 * Since we'd like to manage prefixes separately from addresses, 532 * we make an ND6 prefix structure for the link-local prefix, 533 * and add it to the prefix list as a never-expire prefix. 534 * XXX: this change might affect some existing code base... 535 */ 536 bzero(&pr0, sizeof(pr0)); 537 pr0.ndpr_ifp = ifp; 538 /* this should be 64 at this moment. */ 539 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 540 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 541 pr0.ndpr_prefix = ifra.ifra_addr; 542 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 543 for (i = 0; i < 4; i++) { 544 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 545 in6mask64.s6_addr32[i]; 546 } 547 /* 548 * Initialize parameters. The link-local prefix must always be 549 * on-link, and its lifetimes never expire. 550 */ 551 pr0.ndpr_raf_onlink = 1; 552 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 553 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 554 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 555 /* 556 * Since there is no other link-local addresses, nd6_prefix_lookup() 557 * probably returns NULL. However, we cannot always expect the result. 558 * For example, if we first remove the (only) existing link-local 559 * address, and then reconfigure another one, the prefix is still 560 * valid with referring to the old link-local address. 561 */ 562 if (nd6_prefix_lookup(&pr0) == NULL) { 563 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 564 return(error); 565 } 566 567 return 0; 568 } 569 570 static int 571 in6_ifattach_loopback(ifp) 572 struct ifnet *ifp; /* must be IFT_LOOP */ 573 { 574 struct in6_aliasreq ifra; 575 int error; 576 577 bzero(&ifra, sizeof(ifra)); 578 579 /* 580 * in6_update_ifa() does not use ifra_name, but we accurately set it 581 * for safety. 582 */ 583 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 584 585 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 586 ifra.ifra_prefixmask.sin6_family = AF_INET6; 587 ifra.ifra_prefixmask.sin6_addr = in6mask128; 588 589 /* 590 * Always initialize ia_dstaddr (= broadcast address) to loopback 591 * address. Follows IPv4 practice - see in_ifinit(). 592 */ 593 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 594 ifra.ifra_dstaddr.sin6_family = AF_INET6; 595 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 596 597 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 598 ifra.ifra_addr.sin6_family = AF_INET6; 599 ifra.ifra_addr.sin6_addr = in6addr_loopback; 600 601 /* the loopback address should NEVER expire. */ 602 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 603 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 604 605 /* we don't need to perform DAD on loopback interfaces. */ 606 ifra.ifra_flags |= IN6_IFF_NODAD; 607 608 /* skip registration to the prefix list. XXX should be temporary. */ 609 ifra.ifra_flags |= IN6_IFF_NOPFX; 610 611 /* 612 * We are sure that this is a newly assigned address, so we can set 613 * NULL to the 3rd arg. 614 */ 615 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 616 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 617 "the loopback address on %s (errno=%d)\n", 618 if_name(ifp), error); 619 return(-1); 620 } 621 622 return 0; 623 } 624 625 /* 626 * compute NI group address, based on the current hostname setting. 627 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 628 * 629 * when ifp == NULL, the caller is responsible for filling scopeid. 630 */ 631 int 632 in6_nigroup(ifp, name, namelen, in6) 633 struct ifnet *ifp; 634 const char *name; 635 int namelen; 636 struct in6_addr *in6; 637 { 638 const char *p; 639 u_char *q; 640 MD5_CTX ctxt; 641 u_int8_t digest[16]; 642 char l; 643 char n[64]; /* a single label must not exceed 63 chars */ 644 645 if (!namelen || !name) 646 return -1; 647 648 p = name; 649 while (p && *p && *p != '.' && p - name < namelen) 650 p++; 651 if (p - name > sizeof(n) - 1) 652 return -1; /* label too long */ 653 l = p - name; 654 strncpy(n, name, l); 655 n[(int)l] = '\0'; 656 for (q = n; *q; q++) { 657 if ('A' <= *q && *q <= 'Z') 658 *q = *q - 'A' + 'a'; 659 } 660 661 /* generate 8 bytes of pseudo-random value. */ 662 bzero(&ctxt, sizeof(ctxt)); 663 MD5Init(&ctxt); 664 MD5Update(&ctxt, &l, sizeof(l)); 665 MD5Update(&ctxt, n, l); 666 MD5Final(digest, &ctxt); 667 668 bzero(in6, sizeof(*in6)); 669 in6->s6_addr16[0] = htons(0xff02); 670 if (ifp) 671 in6->s6_addr16[1] = htons(ifp->if_index); 672 in6->s6_addr8[11] = 2; 673 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 674 675 return 0; 676 } 677 678 void 679 in6_nigroup_attach(name, namelen) 680 const char *name; 681 int namelen; 682 { 683 struct ifnet *ifp; 684 struct sockaddr_in6 mltaddr; 685 struct in6_multi *in6m; 686 int error; 687 688 bzero(&mltaddr, sizeof(mltaddr)); 689 mltaddr.sin6_family = AF_INET6; 690 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 691 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 692 return; 693 694 IFNET_RLOCK(); 695 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 696 { 697 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 698 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 699 if (!in6m) { 700 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 701 nd6log((LOG_ERR, "%s: failed to join %s " 702 "(errno=%d)\n", if_name(ifp), 703 ip6_sprintf(&mltaddr.sin6_addr), 704 error)); 705 } 706 } 707 } 708 IFNET_RUNLOCK(); 709 } 710 711 void 712 in6_nigroup_detach(name, namelen) 713 const char *name; 714 int namelen; 715 { 716 struct ifnet *ifp; 717 struct sockaddr_in6 mltaddr; 718 struct in6_multi *in6m; 719 720 bzero(&mltaddr, sizeof(mltaddr)); 721 mltaddr.sin6_family = AF_INET6; 722 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 723 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 724 return; 725 726 IFNET_RLOCK(); 727 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 728 { 729 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 730 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 731 if (in6m) 732 in6_delmulti(in6m); 733 } 734 IFNET_RUNLOCK(); 735 } 736 737 /* 738 * XXX multiple loopback interface needs more care. for instance, 739 * nodelocal address needs to be configured onto only one of them. 740 * XXX multiple link-local address case 741 */ 742 void 743 in6_ifattach(ifp, altifp) 744 struct ifnet *ifp; 745 struct ifnet *altifp; /* secondary EUI64 source */ 746 { 747 static size_t if_indexlim = 8; 748 struct in6_ifaddr *ia; 749 struct in6_addr in6; 750 751 /* some of the interfaces are inherently not IPv6 capable */ 752 switch (ifp->if_type) { 753 #ifdef IFT_BRIDGE /*OpenBSD 2.8*/ 754 case IFT_BRIDGE: 755 return; 756 #endif 757 } 758 759 /* 760 * We have some arrays that should be indexed by if_index. 761 * since if_index will grow dynamically, they should grow too. 762 * struct in6_ifstat **in6_ifstat 763 * struct icmp6_ifstat **icmp6_ifstat 764 */ 765 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 766 if_index >= if_indexlim) { 767 size_t n; 768 caddr_t q; 769 size_t olim; 770 771 olim = if_indexlim; 772 while (if_index >= if_indexlim) 773 if_indexlim <<= 1; 774 775 /* grow in6_ifstat */ 776 n = if_indexlim * sizeof(struct in6_ifstat *); 777 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 778 bzero(q, n); 779 if (in6_ifstat) { 780 bcopy((caddr_t)in6_ifstat, q, 781 olim * sizeof(struct in6_ifstat *)); 782 free((caddr_t)in6_ifstat, M_IFADDR); 783 } 784 in6_ifstat = (struct in6_ifstat **)q; 785 in6_ifstatmax = if_indexlim; 786 787 /* grow icmp6_ifstat */ 788 n = if_indexlim * sizeof(struct icmp6_ifstat *); 789 q = (caddr_t)malloc(n, M_IFADDR, M_WAITOK); 790 bzero(q, n); 791 if (icmp6_ifstat) { 792 bcopy((caddr_t)icmp6_ifstat, q, 793 olim * sizeof(struct icmp6_ifstat *)); 794 free((caddr_t)icmp6_ifstat, M_IFADDR); 795 } 796 icmp6_ifstat = (struct icmp6_ifstat **)q; 797 icmp6_ifstatmax = if_indexlim; 798 } 799 800 /* initialize scope identifiers */ 801 scope6_ifattach(ifp); 802 803 /* 804 * quirks based on interface type 805 */ 806 switch (ifp->if_type) { 807 #ifdef IFT_STF 808 case IFT_STF: 809 /* 810 * 6to4 interface is a very special kind of beast. 811 * no multicast, no linklocal. RFC2529 specifies how to make 812 * linklocals for 6to4 interface, but there's no use and 813 * it is rather harmful to have one. 814 */ 815 goto statinit; 816 #endif 817 default: 818 break; 819 } 820 821 /* 822 * usually, we require multicast capability to the interface 823 */ 824 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 825 log(LOG_INFO, "in6_ifattach: " 826 "%s is not multicast capable, IPv6 not enabled\n", 827 if_name(ifp)); 828 return; 829 } 830 831 /* 832 * assign loopback address for loopback interface. 833 * XXX multiple loopback interface case. 834 */ 835 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 836 in6 = in6addr_loopback; 837 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 838 if (in6_ifattach_loopback(ifp) != 0) 839 return; 840 } 841 } 842 843 /* 844 * assign a link-local address, if there's none. 845 */ 846 if (ip6_auto_linklocal) { 847 ia = in6ifa_ifpforlinklocal(ifp, 0); 848 if (ia == NULL) { 849 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 850 /* linklocal address assigned */ 851 } else { 852 /* failed to assign linklocal address. bark? */ 853 } 854 } 855 } 856 857 #ifdef IFT_STF /* XXX */ 858 statinit: 859 #endif 860 861 /* update dynamically. */ 862 if (in6_maxmtu < ifp->if_mtu) 863 in6_maxmtu = ifp->if_mtu; 864 865 if (in6_ifstat[ifp->if_index] == NULL) { 866 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 867 malloc(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 868 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 869 } 870 if (icmp6_ifstat[ifp->if_index] == NULL) { 871 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 872 malloc(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 873 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 874 } 875 876 /* initialize NDP variables */ 877 nd6_ifattach(ifp); 878 } 879 880 /* 881 * NOTE: in6_ifdetach() does not support loopback if at this moment. 882 * We don't need this function in bsdi, because interfaces are never removed 883 * from the ifnet list in bsdi. 884 */ 885 void 886 in6_ifdetach(ifp) 887 struct ifnet *ifp; 888 { 889 struct in6_ifaddr *ia, *oia; 890 struct ifaddr *ifa, *next; 891 struct rtentry *rt; 892 short rtflags; 893 struct sockaddr_in6 sin6; 894 struct in6_multi *in6m; 895 struct in6_multi *in6m_next; 896 897 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 898 in6_purgeprefix(ifp); 899 900 /* remove neighbor management table */ 901 nd6_purge(ifp); 902 903 /* nuke any of IPv6 addresses we have */ 904 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 905 { 906 next = ifa->ifa_list.tqe_next; 907 if (ifa->ifa_addr->sa_family != AF_INET6) 908 continue; 909 in6_purgeaddr(ifa); 910 } 911 912 /* undo everything done by in6_ifattach(), just in case */ 913 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 914 { 915 next = ifa->ifa_list.tqe_next; 916 917 918 if (ifa->ifa_addr->sa_family != AF_INET6 919 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 920 continue; 921 } 922 923 ia = (struct in6_ifaddr *)ifa; 924 925 /* remove from the routing table */ 926 if ((ia->ia_flags & IFA_ROUTE) 927 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 928 rtflags = rt->rt_flags; 929 rtfree(rt); 930 rtrequest(RTM_DELETE, 931 (struct sockaddr *)&ia->ia_addr, 932 (struct sockaddr *)&ia->ia_addr, 933 (struct sockaddr *)&ia->ia_prefixmask, 934 rtflags, (struct rtentry **)0); 935 } 936 937 /* remove from the linked list */ 938 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 939 IFAFREE(&ia->ia_ifa); 940 941 /* also remove from the IPv6 address chain(itojun&jinmei) */ 942 oia = ia; 943 if (oia == (ia = in6_ifaddr)) 944 in6_ifaddr = ia->ia_next; 945 else { 946 while (ia->ia_next && (ia->ia_next != oia)) 947 ia = ia->ia_next; 948 if (ia->ia_next) 949 ia->ia_next = oia->ia_next; 950 else { 951 nd6log((LOG_ERR, 952 "%s: didn't unlink in6ifaddr from " 953 "list\n", if_name(ifp))); 954 } 955 } 956 957 IFAFREE(&oia->ia_ifa); 958 } 959 960 /* leave from all multicast groups joined */ 961 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 962 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 963 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 964 in6m_next = LIST_NEXT(in6m, in6m_entry); 965 if (in6m->in6m_ifp != ifp) 966 continue; 967 in6_delmulti(in6m); 968 in6m = NULL; 969 } 970 971 /* 972 * remove neighbor management table. we call it twice just to make 973 * sure we nuke everything. maybe we need just one call. 974 * XXX: since the first call did not release addresses, some prefixes 975 * might remain. We should call nd6_purge() again to release the 976 * prefixes after removing all addresses above. 977 * (Or can we just delay calling nd6_purge until at this point?) 978 */ 979 nd6_purge(ifp); 980 981 /* remove route to link-local allnodes multicast (ff02::1) */ 982 bzero(&sin6, sizeof(sin6)); 983 sin6.sin6_len = sizeof(struct sockaddr_in6); 984 sin6.sin6_family = AF_INET6; 985 sin6.sin6_addr = in6addr_linklocal_allnodes; 986 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 987 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 988 if (rt && rt->rt_ifp == ifp) { 989 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 990 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 991 rtfree(rt); 992 } 993 } 994 995 void 996 in6_get_tmpifid(ifp, retbuf, baseid, generate) 997 struct ifnet *ifp; 998 u_int8_t *retbuf; 999 const u_int8_t *baseid; 1000 int generate; 1001 { 1002 u_int8_t nullbuf[8]; 1003 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 1004 1005 bzero(nullbuf, sizeof(nullbuf)); 1006 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1007 /* we've never created a random ID. Create a new one. */ 1008 generate = 1; 1009 } 1010 1011 if (generate) { 1012 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1013 1014 /* generate_tmp_ifid will update seedn and buf */ 1015 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1016 ndi->randomid); 1017 } 1018 bcopy(ndi->randomid, retbuf, 8); 1019 } 1020 1021 void 1022 in6_tmpaddrtimer(ignored_arg) 1023 void *ignored_arg; 1024 { 1025 int i; 1026 struct nd_ifinfo *ndi; 1027 u_int8_t nullbuf[8]; 1028 int s = splnet(); 1029 1030 callout_reset(&in6_tmpaddrtimer_ch, 1031 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1032 ip6_temp_regen_advance) * hz, 1033 in6_tmpaddrtimer, NULL); 1034 1035 bzero(nullbuf, sizeof(nullbuf)); 1036 for (i = 1; i < if_index + 1; i++) { 1037 ndi = &nd_ifinfo[i]; 1038 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1039 /* 1040 * We've been generating a random ID on this interface. 1041 * Create a new one. 1042 */ 1043 (void)generate_tmp_ifid(ndi->randomseed0, 1044 ndi->randomseed1, 1045 ndi->randomid); 1046 } 1047 } 1048 1049 splx(s); 1050 }
Cache object: d9d64e4b5957281a6666e4839fe7fa4f
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