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sys/bsd/netinet6/in6_ifattach.c
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1 /* $FreeBSD: src/sys/netinet6/in6_ifattach.c,v 1.8 2002/04/19 04:46:22 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/socketvar.h> 38 #include <sys/sockio.h> 39 #include <sys/kernel.h> 40 #include <sys/syslog.h> 41 #include <sys/md5.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 53 #include <netinet/ip6.h> 54 #include <netinet6/ip6_var.h> 55 #include <netinet6/in6_var.h> 56 #include <netinet6/in6_pcb.h> 57 #include <netinet6/in6_ifattach.h> 58 #include <netinet6/ip6_var.h> 59 #include <netinet6/nd6.h> 60 #include <netinet6/scope6_var.h> 61 62 #include <net/net_osdep.h> 63 64 struct in6_ifstat **in6_ifstat = NULL; 65 struct icmp6_ifstat **icmp6_ifstat = NULL; 66 size_t in6_ifstatmax = 0; 67 size_t icmp6_ifstatmax = 0; 68 unsigned long in6_maxmtu = 0; 69 70 #if IP6_AUTO_LINKLOCAL 71 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 72 #else 73 int ip6_auto_linklocal = 1; /* enable by default */ 74 #endif 75 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 *, struct in6_aliasreq *)); 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 #if 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 #if 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 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 385 { 386 if (ifp == ifp0) 387 continue; 388 if (get_hw_ifid(ifp, in6) != 0) 389 continue; 390 391 /* 392 * to borrow ifid from other interface, ifid needs to be 393 * globally unique 394 */ 395 if (IFID_UNIVERSAL(in6)) { 396 nd6log((LOG_DEBUG, 397 "%s: borrow interface identifier from %s\n", 398 if_name(ifp0), if_name(ifp))); 399 goto success; 400 } 401 } 402 403 /* last resort: get from random number source */ 404 if (get_rand_ifid(ifp, in6) == 0) { 405 nd6log((LOG_DEBUG, 406 "%s: interface identifier generated by random number\n", 407 if_name(ifp0))); 408 goto success; 409 } 410 411 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 412 return -1; 413 414 success: 415 nd6log((LOG_INFO, "%s: ifid: " 416 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 417 if_name(ifp0), 418 in6->s6_addr[8], in6->s6_addr[9], 419 in6->s6_addr[10], in6->s6_addr[11], 420 in6->s6_addr[12], in6->s6_addr[13], 421 in6->s6_addr[14], in6->s6_addr[15])); 422 return 0; 423 } 424 425 static int 426 in6_ifattach_linklocal(ifp, altifp, ifra_passed) 427 struct ifnet *ifp; 428 struct ifnet *altifp; /* secondary EUI64 source */ 429 struct in6_aliasreq *ifra_passed; 430 { 431 struct in6_ifaddr *ia; 432 struct in6_aliasreq ifra; 433 struct nd_prefix pr0; 434 int i, dl_tag, error; 435 436 /* 437 * configure link-local address. 438 */ 439 bzero(&ifra, sizeof(ifra)); 440 441 dlil_plumb_protocol(PF_INET6, ifp, &dl_tag); 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 if (ifp->if_type == IFT_PPP && ifra_passed != NULL) /* PPP provided both addresses for us */ 450 bcopy(&ifra_passed->ifra_addr, &(ifra.ifra_addr), sizeof(struct sockaddr_in6)); 451 else { 452 ifra.ifra_addr.sin6_family = AF_INET6; 453 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 454 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 455 #if SCOPEDROUTING 456 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 457 #else 458 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 459 #endif 460 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 461 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 462 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 463 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 464 } else { 465 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 466 nd6log((LOG_ERR, 467 " %s: no ifid available\n", if_name(ifp))); 468 return -1; 469 } 470 } 471 #if SCOPEDROUTING 472 ifra.ifra_addr.sin6_scope_id = 473 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 474 #endif 475 } 476 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 477 ifra.ifra_prefixmask.sin6_family = AF_INET6; 478 ifra.ifra_prefixmask.sin6_addr = in6mask64; 479 #if SCOPEDROUTING 480 /* take into accound the sin6_scope_id field for routing */ 481 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 482 #endif 483 /* link-local addresses should NEVER expire. */ 484 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 485 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 486 487 /* 488 * Do not let in6_update_ifa() do DAD, since we need a random delay 489 * before sending an NS at the first time the interface becomes up. 490 * Instead, in6_if_up() will start DAD with a proper random delay. 491 */ 492 ifra.ifra_flags |= IN6_IFF_NODAD; 493 494 /* 495 * Now call in6_update_ifa() to do a bunch of procedures to configure 496 * a link-local address. We can set NULL to the 3rd argument, because 497 * we know there's no other link-local address on the interface 498 * and therefore we are adding one (instead of updating one). 499 */ 500 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 501 /* 502 * XXX: When the interface does not support IPv6, this call 503 * would fail in the SIOCSIFADDR ioctl. I believe the 504 * notification is rather confusing in this case, so just 505 * supress it. (jinmei@kame.net 20010130) 506 */ 507 if (error != EAFNOSUPPORT) 508 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 509 "configure a link-local address on %s " 510 "(errno=%d)\n", 511 if_name(ifp), error); 512 return(-1); 513 } 514 515 /* 516 * Adjust ia6_flags so that in6_if_up will perform DAD. 517 * XXX: Some P2P interfaces seem not to send packets just after 518 * becoming up, so we skip p2p interfaces for safety. 519 */ 520 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 521 #if DIAGNOSTIC 522 if (!ia) { 523 panic("ia == NULL in in6_ifattach_linklocal"); 524 /*NOTREACHED*/ 525 } 526 #endif 527 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 528 ia->ia6_flags &= ~IN6_IFF_NODAD; 529 ia->ia6_flags |= IN6_IFF_TENTATIVE; 530 } 531 532 /* 533 * Make the link-local prefix (fe80::/64%link) as on-link. 534 * Since we'd like to manage prefixes separately from addresses, 535 * we make an ND6 prefix structure for the link-local prefix, 536 * and add it to the prefix list as a never-expire prefix. 537 * XXX: this change might affect some existing code base... 538 */ 539 bzero(&pr0, sizeof(pr0)); 540 pr0.ndpr_ifp = ifp; 541 /* this should be 64 at this moment. */ 542 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 543 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 544 pr0.ndpr_prefix = ifra.ifra_addr; 545 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 546 for (i = 0; i < 4; i++) { 547 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 548 in6mask64.s6_addr32[i]; 549 } 550 /* 551 * Initialize parameters. The link-local prefix must always be 552 * on-link, and its lifetimes never expire. 553 */ 554 pr0.ndpr_raf_onlink = 1; 555 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 556 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 557 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 558 /* 559 * Since there is no other link-local addresses, nd6_prefix_lookup() 560 * probably returns NULL. However, we cannot always expect the result. 561 * For example, if we first remove the (only) existing link-local 562 * address, and then reconfigure another one, the prefix is still 563 * valid with referring to the old link-local address. 564 */ 565 if (nd6_prefix_lookup(&pr0) == NULL) { 566 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 567 return(error); 568 } 569 570 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia); 571 return 0; 572 } 573 574 static int 575 in6_ifattach_loopback(ifp) 576 struct ifnet *ifp; /* must be IFT_LOOP */ 577 { 578 struct in6_aliasreq ifra; 579 int error; 580 581 bzero(&ifra, sizeof(ifra)); 582 583 /* 584 * in6_update_ifa() does not use ifra_name, but we accurately set it 585 * for safety. 586 */ 587 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 588 589 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 590 ifra.ifra_prefixmask.sin6_family = AF_INET6; 591 ifra.ifra_prefixmask.sin6_addr = in6mask128; 592 593 /* 594 * Always initialize ia_dstaddr (= broadcast address) to loopback 595 * address. Follows IPv4 practice - see in_ifinit(). 596 */ 597 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 598 ifra.ifra_dstaddr.sin6_family = AF_INET6; 599 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 600 601 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 602 ifra.ifra_addr.sin6_family = AF_INET6; 603 ifra.ifra_addr.sin6_addr = in6addr_loopback; 604 605 /* the loopback address should NEVER expire. */ 606 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 607 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 608 609 /* we don't need to perform DAD on loopback interfaces. */ 610 ifra.ifra_flags |= IN6_IFF_NODAD; 611 612 /* skip registration to the prefix list. XXX should be temporary. */ 613 ifra.ifra_flags |= IN6_IFF_NOPFX; 614 615 /* 616 * We are sure that this is a newly assigned address, so we can set 617 * NULL to the 3rd arg. 618 */ 619 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 620 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 621 "the loopback address on %s (errno=%d)\n", 622 if_name(ifp), error); 623 return(-1); 624 } 625 626 return 0; 627 } 628 629 /* 630 * compute NI group address, based on the current hostname setting. 631 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 632 * 633 * when ifp == NULL, the caller is responsible for filling scopeid. 634 */ 635 int 636 in6_nigroup(ifp, name, namelen, in6) 637 struct ifnet *ifp; 638 const char *name; 639 int namelen; 640 struct in6_addr *in6; 641 { 642 const char *p; 643 u_char *q; 644 MD5_CTX ctxt; 645 u_int8_t digest[16]; 646 char l; 647 char n[64]; /* a single label must not exceed 63 chars */ 648 649 if (!namelen || !name) 650 return -1; 651 652 p = name; 653 while (p && *p && *p != '.' && p - name < namelen) 654 p++; 655 if (p - name > sizeof(n) - 1) 656 return -1; /* label too long */ 657 l = p - name; 658 strncpy(n, name, l); 659 n[(int)l] = '\0'; 660 for (q = n; *q; q++) { 661 if ('A' <= *q && *q <= 'Z') 662 *q = *q - 'A' + 'a'; 663 } 664 665 /* generate 8 bytes of pseudo-random value. */ 666 bzero(&ctxt, sizeof(ctxt)); 667 MD5Init(&ctxt); 668 MD5Update(&ctxt, &l, sizeof(l)); 669 MD5Update(&ctxt, n, l); 670 MD5Final(digest, &ctxt); 671 672 bzero(in6, sizeof(*in6)); 673 in6->s6_addr16[0] = htons(0xff02); 674 if (ifp) 675 in6->s6_addr16[1] = htons(ifp->if_index); 676 in6->s6_addr8[11] = 2; 677 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 678 679 return 0; 680 } 681 682 void 683 in6_nigroup_attach(name, namelen) 684 const char *name; 685 int namelen; 686 { 687 struct ifnet *ifp; 688 struct sockaddr_in6 mltaddr; 689 struct in6_multi *in6m; 690 int error; 691 692 bzero(&mltaddr, sizeof(mltaddr)); 693 mltaddr.sin6_family = AF_INET6; 694 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 695 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 696 return; 697 698 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 699 { 700 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 701 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 702 if (!in6m) { 703 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) { 704 nd6log((LOG_ERR, "%s: failed to join %s " 705 "(errno=%d)\n", if_name(ifp), 706 ip6_sprintf(&mltaddr.sin6_addr), 707 error)); 708 } 709 } 710 } 711 } 712 713 void 714 in6_nigroup_detach(name, namelen) 715 const char *name; 716 int namelen; 717 { 718 struct ifnet *ifp; 719 struct sockaddr_in6 mltaddr; 720 struct in6_multi *in6m; 721 722 bzero(&mltaddr, sizeof(mltaddr)); 723 mltaddr.sin6_family = AF_INET6; 724 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 725 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 726 return; 727 728 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) 729 { 730 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 731 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 732 if (in6m) 733 in6_delmulti(in6m); 734 } 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, ifra) 744 struct ifnet *ifp; 745 struct ifnet *altifp; /* secondary EUI64 source */ 746 struct in6_aliasreq *ifra; 747 { 748 static size_t if_indexlim = 8; 749 struct in6_ifaddr *ia; 750 struct in6_addr in6; 751 752 753 /* 754 * We have some arrays that should be indexed by if_index. 755 * since if_index will grow dynamically, they should grow too. 756 * struct in6_ifstat **in6_ifstat 757 * struct icmp6_ifstat **icmp6_ifstat 758 */ 759 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 760 if_index >= if_indexlim) { 761 size_t n; 762 caddr_t q; 763 size_t olim; 764 765 olim = if_indexlim; 766 while (if_index >= if_indexlim) 767 if_indexlim <<= 1; 768 769 /* grow in6_ifstat */ 770 n = if_indexlim * sizeof(struct in6_ifstat *); 771 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 772 bzero(q, n); 773 if (in6_ifstat) { 774 bcopy((caddr_t)in6_ifstat, q, 775 olim * sizeof(struct in6_ifstat *)); 776 FREE((caddr_t)in6_ifstat, M_IFADDR); 777 } 778 in6_ifstat = (struct in6_ifstat **)q; 779 in6_ifstatmax = if_indexlim; 780 781 /* grow icmp6_ifstat */ 782 n = if_indexlim * sizeof(struct icmp6_ifstat *); 783 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 784 bzero(q, n); 785 if (icmp6_ifstat) { 786 bcopy((caddr_t)icmp6_ifstat, q, 787 olim * sizeof(struct icmp6_ifstat *)); 788 FREE((caddr_t)icmp6_ifstat, M_IFADDR); 789 } 790 icmp6_ifstat = (struct icmp6_ifstat **)q; 791 icmp6_ifstatmax = if_indexlim; 792 } 793 794 /* initialize NDP variables */ 795 nd6_ifattach(ifp); 796 797 /* initialize scope identifiers */ 798 scope6_ifattach(ifp); 799 800 /* 801 * quirks based on interface type 802 */ 803 switch (ifp->if_type) { 804 #if IFT_STF 805 case IFT_STF: 806 /* 807 * 6to4 interface is a very special kind of beast. 808 * no multicast, no linklocal. RFC2529 specifies how to make 809 * linklocals for 6to4 interface, but there's no use and 810 * it is rather harmful to have one. 811 */ 812 goto statinit; 813 #endif 814 default: 815 break; 816 } 817 818 /* 819 * usually, we require multicast capability to the interface 820 */ 821 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 822 log(LOG_INFO, "in6_ifattach: " 823 "%s is not multicast capable, IPv6 not enabled\n", 824 if_name(ifp)); 825 return; 826 } 827 828 /* 829 * assign loopback address for loopback interface. 830 * XXX multiple loopback interface case. 831 */ 832 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 833 in6 = in6addr_loopback; 834 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 835 if (in6_ifattach_loopback(ifp) != 0) 836 return; 837 } 838 } 839 840 /* 841 * assign a link-local address, if there's none. 842 */ 843 if (ip6_auto_linklocal) { 844 ia = in6ifa_ifpforlinklocal(ifp, 0); 845 if (ia == NULL) { 846 if (in6_ifattach_linklocal(ifp, altifp, ifra) == 0) { 847 /* linklocal address assigned */ 848 } else { 849 log(LOG_INFO, "in6_ifattach: " 850 "%s failed to attach a linklocal address.\n", 851 if_name(ifp)); 852 /* failed to assign linklocal address. bark? */ 853 } 854 } 855 } 856 857 #if 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 } 876 877 /* 878 * NOTE: in6_ifdetach() does not support loopback if at this moment. 879 * We don't need this function in bsdi, because interfaces are never removed 880 * from the ifnet list in bsdi. 881 */ 882 void 883 in6_ifdetach(ifp) 884 struct ifnet *ifp; 885 { 886 struct in6_ifaddr *ia, *oia; 887 struct ifaddr *ifa, *next; 888 struct rtentry *rt; 889 short rtflags; 890 struct sockaddr_in6 sin6; 891 struct in6_multi *in6m; 892 struct in6_multi *in6m_next; 893 894 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 895 in6_purgeprefix(ifp); 896 897 /* remove neighbor management table */ 898 nd6_purge(ifp); 899 900 /* nuke any of IPv6 addresses we have */ 901 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 902 { 903 next = ifa->ifa_list.tqe_next; 904 if (ifa->ifa_addr->sa_family != AF_INET6) 905 continue; 906 in6_purgeaddr(ifa); 907 } 908 909 /* undo everything done by in6_ifattach(), just in case */ 910 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 911 { 912 next = ifa->ifa_list.tqe_next; 913 914 915 if (ifa->ifa_addr->sa_family != AF_INET6 916 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 917 continue; 918 } 919 920 ia = (struct in6_ifaddr *)ifa; 921 922 /* remove from the routing table */ 923 if ((ia->ia_flags & IFA_ROUTE) 924 && (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 925 rtflags = rt->rt_flags; 926 rtfree(rt); 927 rtrequest(RTM_DELETE, 928 (struct sockaddr *)&ia->ia_addr, 929 (struct sockaddr *)&ia->ia_addr, 930 (struct sockaddr *)&ia->ia_prefixmask, 931 rtflags, (struct rtentry **)0); 932 } 933 934 /* remove from the linked list */ 935 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 936 ifafree(&ia->ia_ifa); 937 938 /* also remove from the IPv6 address chain(itojun&jinmei) */ 939 oia = ia; 940 if (oia == (ia = in6_ifaddr)) 941 in6_ifaddr = ia->ia_next; 942 else { 943 while (ia->ia_next && (ia->ia_next != oia)) 944 ia = ia->ia_next; 945 if (ia->ia_next) 946 ia->ia_next = oia->ia_next; 947 else { 948 nd6log((LOG_ERR, 949 "%s: didn't unlink in6ifaddr from " 950 "list\n", if_name(ifp))); 951 } 952 } 953 954 IFAFREE(&oia->ia_ifa); 955 } 956 957 #ifndef __APPLE__ 958 959 /* This is a cause for reentrency, as those multicast addresses are 960 * freed both from the interface detaching and triggered by the closing of the socket 961 * Let the socket do the cleanup and not force it from the interface level 962 */ 963 /* leave from all multicast groups joined */ 964 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 965 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 966 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 967 in6m_next = LIST_NEXT(in6m, in6m_entry); 968 if (in6m->in6m_ifp != ifp) 969 continue; 970 in6_delmulti(in6m); 971 in6m = NULL; 972 } 973 #endif /* __APPLE__ */ 974 975 /* 976 * remove neighbor management table. we call it twice just to make 977 * sure we nuke everything. maybe we need just one call. 978 * XXX: since the first call did not release addresses, some prefixes 979 * might remain. We should call nd6_purge() again to release the 980 * prefixes after removing all addresses above. 981 * (Or can we just delay calling nd6_purge until at this point?) 982 */ 983 nd6_purge(ifp); 984 985 /* remove route to link-local allnodes multicast (ff02::1) */ 986 bzero(&sin6, sizeof(sin6)); 987 sin6.sin6_len = sizeof(struct sockaddr_in6); 988 sin6.sin6_family = AF_INET6; 989 sin6.sin6_addr = in6addr_linklocal_allnodes; 990 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 991 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 992 if (rt && rt->rt_ifp == ifp) { 993 rtrequest(RTM_DELETE, (struct sockaddr *)rt_key(rt), 994 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 995 rtfree(rt); 996 } 997 } 998 999 void 1000 in6_get_tmpifid(ifp, retbuf, baseid, generate) 1001 struct ifnet *ifp; 1002 u_int8_t *retbuf; 1003 const u_int8_t *baseid; 1004 int generate; 1005 { 1006 u_int8_t nullbuf[8]; 1007 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 1008 1009 bzero(nullbuf, sizeof(nullbuf)); 1010 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1011 /* we've never created a random ID. Create a new one. */ 1012 generate = 1; 1013 } 1014 1015 if (generate) { 1016 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1017 1018 /* generate_tmp_ifid will update seedn and buf */ 1019 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1020 ndi->randomid); 1021 } 1022 bcopy(ndi->randomid, retbuf, 8); 1023 } 1024 1025 void 1026 in6_tmpaddrtimer_funneled(void *ignored_arg) 1027 { 1028 #ifdef __APPLE__ 1029 boolean_t funnel_state; 1030 funnel_state = thread_funnel_set(network_flock, TRUE); 1031 #endif 1032 in6_tmpaddrtimer(ignored_arg); 1033 #ifdef __APPLE__ 1034 (void) thread_funnel_set(network_flock, FALSE); 1035 #endif 1036 } 1037 1038 void 1039 in6_tmpaddrtimer(ignored_arg) 1040 void *ignored_arg; 1041 { 1042 int i; 1043 struct nd_ifinfo *ndi; 1044 u_int8_t nullbuf[8]; 1045 int s = splnet(); 1046 1047 timeout(in6_tmpaddrtimer_funneled, (caddr_t)0, 1048 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1049 ip6_temp_regen_advance) * hz); 1050 1051 bzero(nullbuf, sizeof(nullbuf)); 1052 for (i = 1; i < if_index + 1; i++) { 1053 ndi = &nd_ifinfo[i]; 1054 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1055 /* 1056 * We've been generating a random ID on this interface. 1057 * Create a new one. 1058 */ 1059 (void)generate_tmp_ifid(ndi->randomseed0, 1060 ndi->randomseed1, 1061 ndi->randomid); 1062 } 1063 } 1064 1065 splx(s); 1066 }
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