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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 #include <kern/lock.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 struct in6_ifstat **in6_ifstat = NULL; 66 struct icmp6_ifstat **icmp6_ifstat = NULL; 67 size_t in6_ifstatmax = 0; 68 size_t icmp6_ifstatmax = 0; 69 unsigned long in6_maxmtu = 0; 70 extern lck_mtx_t *nd6_mutex; 71 72 #if IP6_AUTO_LINKLOCAL 73 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 74 #else 75 int ip6_auto_linklocal = 1; /* enable by default */ 76 #endif 77 78 79 extern struct inpcbinfo udbinfo; 80 extern struct inpcbinfo ripcbinfo; 81 extern lck_mtx_t *rt_mtx; 82 83 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 84 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 85 static int get_hw_ifid(struct ifnet *, struct in6_addr *); 86 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 87 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *, struct in6_aliasreq *); 88 static int in6_ifattach_loopback(struct ifnet *); 89 90 #define EUI64_GBIT 0x01 91 #define EUI64_UBIT 0x02 92 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 93 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 94 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 95 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 96 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 97 98 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 99 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 100 101 /* 102 * Generate a last-resort interface identifier, when the machine has no 103 * IEEE802/EUI64 address sources. 104 * The goal here is to get an interface identifier that is 105 * (1) random enough and (2) does not change across reboot. 106 * We currently use MD5(hostname) for it. 107 */ 108 static int 109 get_rand_ifid( 110 struct ifnet *ifp, 111 struct in6_addr *in6) /* upper 64bits are preserved */ 112 { 113 MD5_CTX ctxt; 114 u_int8_t digest[16]; 115 int hostnamelen = strlen(hostname); 116 117 #if 0 118 /* we need at least several letters as seed for ifid */ 119 if (hostnamelen < 3) 120 return -1; 121 #endif 122 123 /* generate 8 bytes of pseudo-random value. */ 124 bzero(&ctxt, sizeof(ctxt)); 125 MD5Init(&ctxt); 126 MD5Update(&ctxt, hostname, hostnamelen); 127 MD5Final(digest, &ctxt); 128 129 /* assumes sizeof(digest) > sizeof(ifid) */ 130 bcopy(digest, &in6->s6_addr[8], 8); 131 132 /* make sure to set "u" bit to local, and "g" bit to individual. */ 133 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 134 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 135 136 /* convert EUI64 into IPv6 interface identifier */ 137 EUI64_TO_IFID(in6); 138 139 return 0; 140 } 141 142 static int 143 generate_tmp_ifid( 144 u_int8_t *seed0, 145 const u_int8_t *seed1, 146 u_int8_t *ret) 147 { 148 MD5_CTX ctxt; 149 u_int8_t seed[16], digest[16], nullbuf[8]; 150 u_int32_t val32; 151 struct timeval tv; 152 153 /* If there's no hisotry, start with a random seed. */ 154 bzero(nullbuf, sizeof(nullbuf)); 155 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 156 int i; 157 158 for (i = 0; i < 2; i++) { 159 microtime(&tv); 160 val32 = random() ^ tv.tv_usec; 161 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 162 } 163 } else { 164 bcopy(seed0, seed, 8); 165 } 166 167 /* copy the right-most 64-bits of the given address */ 168 /* XXX assumption on the size of IFID */ 169 bcopy(seed1, &seed[8], 8); 170 171 if (0) { /* for debugging purposes only */ 172 int i; 173 174 printf("generate_tmp_ifid: new randomized ID from: "); 175 for (i = 0; i < 16; i++) 176 printf("%02x", seed[i]); 177 printf(" "); 178 } 179 180 /* generate 16 bytes of pseudo-random value. */ 181 bzero(&ctxt, sizeof(ctxt)); 182 MD5Init(&ctxt); 183 MD5Update(&ctxt, seed, sizeof(seed)); 184 MD5Final(digest, &ctxt); 185 186 /* 187 * RFC 3041 3.2.1. (3) 188 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 189 * left-most bit is numbered 0) to zero. 190 */ 191 bcopy(digest, ret, 8); 192 ret[0] &= ~EUI64_UBIT; 193 194 /* 195 * XXX: we'd like to ensure that the generated value is not zero 196 * for simplicity. If the caclculated digest happens to be zero, 197 * use a random non-zero value as the last resort. 198 */ 199 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 200 log(LOG_INFO, 201 "generate_tmp_ifid: computed MD5 value is zero.\n"); 202 203 microtime(&tv); 204 val32 = random() ^ tv.tv_usec; 205 val32 = 1 + (val32 % (0xffffffff - 1)); 206 } 207 208 /* 209 * RFC 3041 3.2.1. (4) 210 * Take the rightmost 64-bits of the MD5 digest and save them in 211 * stable storage as the history value to be used in the next 212 * iteration of the algorithm. 213 */ 214 bcopy(&digest[8], seed0, 8); 215 216 if (0) { /* for debugging purposes only */ 217 int i; 218 219 printf("to: "); 220 for (i = 0; i < 16; i++) 221 printf("%02x", digest[i]); 222 printf("\n"); 223 } 224 225 return 0; 226 } 227 228 /* 229 * Get interface identifier for the specified interface. 230 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 231 */ 232 static int 233 get_hw_ifid( 234 struct ifnet *ifp, 235 struct in6_addr *in6) /* upper 64bits are preserved */ 236 { 237 struct ifaddr *ifa; 238 struct sockaddr_dl *sdl; 239 u_int8_t *addr; 240 size_t addrlen; 241 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 242 static u_int8_t allone[8] = 243 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 244 245 /* Why doesn't this code use ifnet_addrs? */ 246 ifnet_lock_shared(ifp); 247 for (ifa = ifp->if_addrlist.tqh_first; 248 ifa; 249 ifa = ifa->ifa_list.tqe_next) 250 { 251 if (ifa->ifa_addr->sa_family != AF_LINK) 252 continue; 253 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 254 if (sdl == NULL) 255 continue; 256 if (sdl->sdl_alen == 0) 257 continue; 258 259 goto found; 260 } 261 ifnet_lock_done(ifp); 262 263 return -1; 264 265 found: 266 ifnet_lock_done(ifp); 267 addr = LLADDR(sdl); 268 addrlen = sdl->sdl_alen; 269 270 /* get EUI64 */ 271 switch (ifp->if_type) { 272 case IFT_ETHER: 273 case IFT_FDDI: 274 case IFT_ATM: 275 case IFT_IEEE1394: 276 case IFT_L2VLAN: 277 case IFT_IEEE8023ADLAG: 278 #if IFT_IEEE80211 279 case IFT_IEEE80211: 280 #endif 281 /* IEEE802/EUI64 cases - what others? */ 282 /* IEEE1394 uses 16byte length address starting with EUI64 */ 283 if (addrlen > 8) 284 addrlen = 8; 285 286 /* look at IEEE802/EUI64 only */ 287 if (addrlen != 8 && addrlen != 6) 288 return -1; 289 290 /* 291 * check for invalid MAC address - on bsdi, we see it a lot 292 * since wildboar configures all-zero MAC on pccard before 293 * card insertion. 294 */ 295 if (bcmp(addr, allzero, addrlen) == 0) 296 return -1; 297 if (bcmp(addr, allone, addrlen) == 0) 298 return -1; 299 300 /* make EUI64 address */ 301 if (addrlen == 8) 302 bcopy(addr, &in6->s6_addr[8], 8); 303 else if (addrlen == 6) { 304 in6->s6_addr[8] = addr[0]; 305 in6->s6_addr[9] = addr[1]; 306 in6->s6_addr[10] = addr[2]; 307 in6->s6_addr[11] = 0xff; 308 in6->s6_addr[12] = 0xfe; 309 in6->s6_addr[13] = addr[3]; 310 in6->s6_addr[14] = addr[4]; 311 in6->s6_addr[15] = addr[5]; 312 } 313 break; 314 315 case IFT_ARCNET: 316 if (addrlen != 1) 317 return -1; 318 if (!addr[0]) 319 return -1; 320 321 bzero(&in6->s6_addr[8], 8); 322 in6->s6_addr[15] = addr[0]; 323 324 /* 325 * due to insufficient bitwidth, we mark it local. 326 */ 327 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 328 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 329 break; 330 331 case IFT_GIF: 332 #if IFT_STF 333 case IFT_STF: 334 #endif 335 /* 336 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 337 * however, IPv4 address is not very suitable as unique 338 * identifier source (can be renumbered). 339 * we don't do this. 340 */ 341 return -1; 342 343 default: 344 return -1; 345 } 346 347 /* sanity check: g bit must not indicate "group" */ 348 if (EUI64_GROUP(in6)) 349 return -1; 350 351 /* convert EUI64 into IPv6 interface identifier */ 352 EUI64_TO_IFID(in6); 353 354 /* 355 * sanity check: ifid must not be all zero, avoid conflict with 356 * subnet router anycast 357 */ 358 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 359 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 360 return -1; 361 } 362 363 return 0; 364 } 365 366 /* 367 * Get interface identifier for the specified interface. If it is not 368 * available on ifp0, borrow interface identifier from other information 369 * sources. 370 */ 371 static int 372 get_ifid( 373 struct ifnet *ifp0, 374 struct ifnet *altifp, /* secondary EUI64 source */ 375 struct in6_addr *in6) 376 { 377 struct ifnet *ifp; 378 379 /* first, try to get it from the interface itself */ 380 if (get_hw_ifid(ifp0, in6) == 0) { 381 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 382 if_name(ifp0))); 383 goto success; 384 } 385 386 /* try secondary EUI64 source. this basically is for ATM PVC */ 387 if (altifp && get_hw_ifid(altifp, in6) == 0) { 388 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 389 if_name(ifp0), if_name(altifp))); 390 goto success; 391 } 392 393 /* next, try to get it from some other hardware interface */ 394 ifnet_head_lock_shared(); 395 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 396 if (ifp == ifp0) 397 continue; 398 if (get_hw_ifid(ifp, in6) != 0) 399 continue; 400 401 /* 402 * to borrow ifid from other interface, ifid needs to be 403 * globally unique 404 */ 405 if (IFID_UNIVERSAL(in6)) { 406 nd6log((LOG_DEBUG, 407 "%s: borrow interface identifier from %s\n", 408 if_name(ifp0), if_name(ifp))); 409 ifnet_head_done(); 410 goto success; 411 } 412 } 413 ifnet_head_done(); 414 415 /* last resort: get from random number source */ 416 if (get_rand_ifid(ifp, in6) == 0) { 417 nd6log((LOG_DEBUG, 418 "%s: interface identifier generated by random number\n", 419 if_name(ifp0))); 420 goto success; 421 } 422 423 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 424 return -1; 425 426 success: 427 nd6log((LOG_INFO, "%s: ifid: " 428 "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 429 if_name(ifp0), 430 in6->s6_addr[8], in6->s6_addr[9], 431 in6->s6_addr[10], in6->s6_addr[11], 432 in6->s6_addr[12], in6->s6_addr[13], 433 in6->s6_addr[14], in6->s6_addr[15])); 434 return 0; 435 } 436 437 static int 438 in6_ifattach_linklocal( 439 struct ifnet *ifp, 440 struct ifnet *altifp, /* secondary EUI64 source */ 441 struct in6_aliasreq *ifra_passed) 442 { 443 struct in6_ifaddr *ia; 444 struct in6_aliasreq ifra; 445 struct nd_prefix pr0; 446 int i, error; 447 448 /* 449 * configure link-local address. 450 */ 451 bzero(&ifra, sizeof(ifra)); 452 453 dlil_plumb_protocol(PF_INET6, ifp); 454 455 /* 456 * in6_update_ifa() does not use ifra_name, but we accurately set it 457 * for safety. 458 */ 459 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 460 461 if (ifp->if_type == IFT_PPP && ifra_passed != NULL) /* PPP provided both addresses for us */ 462 bcopy(&ifra_passed->ifra_addr, &(ifra.ifra_addr), sizeof(struct sockaddr_in6)); 463 else { 464 ifra.ifra_addr.sin6_family = AF_INET6; 465 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 466 ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80); 467 #if SCOPEDROUTING 468 ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0 469 #else 470 ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */ 471 #endif 472 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 473 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 474 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 475 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 476 } else { 477 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 478 nd6log((LOG_ERR, 479 " %s: no ifid available\n", if_name(ifp))); 480 return -1; 481 } 482 } 483 #if SCOPEDROUTING 484 ifra.ifra_addr.sin6_scope_id = 485 in6_addr2scopeid(ifp, &ifra.ifra_addr.sin6_addr); 486 #endif 487 } 488 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 489 ifra.ifra_prefixmask.sin6_family = AF_INET6; 490 ifra.ifra_prefixmask.sin6_addr = in6mask64; 491 #if SCOPEDROUTING 492 /* take into accound the sin6_scope_id field for routing */ 493 ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff; 494 #endif 495 /* link-local addresses should NEVER expire. */ 496 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 497 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 498 499 /* 500 * Do not let in6_update_ifa() do DAD, since we need a random delay 501 * before sending an NS at the first time the interface becomes up. 502 * Instead, in6_if_up() will start DAD with a proper random delay. 503 */ 504 ifra.ifra_flags |= IN6_IFF_NODAD; 505 506 /* 507 * Now call in6_update_ifa() to do a bunch of procedures to configure 508 * a link-local address. We can set NULL to the 3rd argument, because 509 * we know there's no other link-local address on the interface 510 * and therefore we are adding one (instead of updating one). 511 */ 512 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 513 /* 514 * XXX: When the interface does not support IPv6, this call 515 * would fail in the SIOCSIFADDR ioctl. I believe the 516 * notification is rather confusing in this case, so just 517 * supress it. (jinmei@kame.net 20010130) 518 */ 519 if (error != EAFNOSUPPORT) 520 log(LOG_NOTICE, "in6_ifattach_linklocal: failed to " 521 "configure a link-local address on %s " 522 "(errno=%d)\n", 523 if_name(ifp), error); 524 return(-1); 525 } 526 527 /* 528 * Adjust ia6_flags so that in6_if_up will perform DAD. 529 * XXX: Some P2P interfaces seem not to send packets just after 530 * becoming up, so we skip p2p interfaces for safety. 531 */ 532 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 533 #if DIAGNOSTIC 534 if (!ia) { 535 panic("ia == NULL in in6_ifattach_linklocal"); 536 /*NOTREACHED*/ 537 } 538 #endif 539 if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) { 540 ia->ia6_flags &= ~IN6_IFF_NODAD; 541 ia->ia6_flags |= IN6_IFF_TENTATIVE; 542 } 543 544 /* 545 * Make the link-local prefix (fe80::/64%link) as on-link. 546 * Since we'd like to manage prefixes separately from addresses, 547 * we make an ND6 prefix structure for the link-local prefix, 548 * and add it to the prefix list as a never-expire prefix. 549 * XXX: this change might affect some existing code base... 550 */ 551 bzero(&pr0, sizeof(pr0)); 552 pr0.ndpr_ifp = ifp; 553 /* this should be 64 at this moment. */ 554 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 555 pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr; 556 pr0.ndpr_prefix = ifra.ifra_addr; 557 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 558 for (i = 0; i < 4; i++) { 559 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 560 in6mask64.s6_addr32[i]; 561 } 562 /* 563 * Initialize parameters. The link-local prefix must always be 564 * on-link, and its lifetimes never expire. 565 */ 566 pr0.ndpr_raf_onlink = 1; 567 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 568 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 569 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 570 /* 571 * Since there is no other link-local addresses, nd6_prefix_lookup() 572 * probably returns NULL. However, we cannot always expect the result. 573 * For example, if we first remove the (only) existing link-local 574 * address, and then reconfigure another one, the prefix is still 575 * valid with referring to the old link-local address. 576 */ 577 if (nd6_prefix_lookup(&pr0) == NULL) { 578 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 579 return(error); 580 } 581 582 in6_post_msg(ifp, KEV_INET6_NEW_LL_ADDR, ia); 583 return 0; 584 } 585 586 static int 587 in6_ifattach_loopback( 588 struct ifnet *ifp) /* must be IFT_LOOP */ 589 { 590 struct in6_aliasreq ifra; 591 int error; 592 593 bzero(&ifra, sizeof(ifra)); 594 595 /* 596 * in6_update_ifa() does not use ifra_name, but we accurately set it 597 * for safety. 598 */ 599 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 600 601 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 602 ifra.ifra_prefixmask.sin6_family = AF_INET6; 603 ifra.ifra_prefixmask.sin6_addr = in6mask128; 604 605 /* 606 * Always initialize ia_dstaddr (= broadcast address) to loopback 607 * address. Follows IPv4 practice - see in_ifinit(). 608 */ 609 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 610 ifra.ifra_dstaddr.sin6_family = AF_INET6; 611 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 612 613 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 614 ifra.ifra_addr.sin6_family = AF_INET6; 615 ifra.ifra_addr.sin6_addr = in6addr_loopback; 616 617 /* the loopback address should NEVER expire. */ 618 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 619 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 620 621 /* we don't need to perform DAD on loopback interfaces. */ 622 ifra.ifra_flags |= IN6_IFF_NODAD; 623 624 /* skip registration to the prefix list. XXX should be temporary. */ 625 ifra.ifra_flags |= IN6_IFF_NOPFX; 626 627 /* 628 * We are sure that this is a newly assigned address, so we can set 629 * NULL to the 3rd arg. 630 */ 631 if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) { 632 log(LOG_ERR, "in6_ifattach_loopback: failed to configure " 633 "the loopback address on %s (errno=%d)\n", 634 if_name(ifp), error); 635 return(-1); 636 } 637 638 return 0; 639 } 640 641 /* 642 * compute NI group address, based on the current hostname setting. 643 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 644 * 645 * when ifp == NULL, the caller is responsible for filling scopeid. 646 */ 647 int 648 in6_nigroup( 649 struct ifnet *ifp, 650 const char *name, 651 int namelen, 652 struct in6_addr *in6) 653 { 654 const char *p; 655 u_char *q; 656 MD5_CTX ctxt; 657 u_int8_t digest[16]; 658 char l; 659 char n[64]; /* a single label must not exceed 63 chars */ 660 661 if (!namelen || !name) 662 return -1; 663 664 p = name; 665 while (p && *p && *p != '.' && p - name < namelen) 666 p++; 667 if (p - name > sizeof(n) - 1) 668 return -1; /* label too long */ 669 l = p - name; 670 strncpy(n, name, l); 671 n[(int)l] = '\0'; 672 for (q = n; *q; q++) { 673 if ('A' <= *q && *q <= 'Z') 674 *q = *q - 'A' + 'a'; 675 } 676 677 /* generate 8 bytes of pseudo-random value. */ 678 bzero(&ctxt, sizeof(ctxt)); 679 MD5Init(&ctxt); 680 MD5Update(&ctxt, &l, sizeof(l)); 681 MD5Update(&ctxt, n, l); 682 MD5Final(digest, &ctxt); 683 684 bzero(in6, sizeof(*in6)); 685 in6->s6_addr16[0] = htons(0xff02); 686 if (ifp) 687 in6->s6_addr16[1] = htons(ifp->if_index); 688 in6->s6_addr8[11] = 2; 689 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 690 691 return 0; 692 } 693 694 void 695 in6_nigroup_attach( 696 const char *name, 697 int namelen) 698 { 699 struct ifnet *ifp; 700 struct sockaddr_in6 mltaddr; 701 struct in6_multi *in6m; 702 int error; 703 704 bzero(&mltaddr, sizeof(mltaddr)); 705 mltaddr.sin6_family = AF_INET6; 706 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 707 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 708 return; 709 710 ifnet_head_lock_shared(); 711 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 712 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 713 ifnet_lock_shared(ifp); 714 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 715 ifnet_lock_done(ifp); 716 if (!in6m) { 717 if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error, 0)) { 718 nd6log((LOG_ERR, "%s: failed to join %s " 719 "(errno=%d)\n", if_name(ifp), 720 ip6_sprintf(&mltaddr.sin6_addr), 721 error)); 722 } 723 } 724 } 725 ifnet_head_done(); 726 } 727 728 void 729 in6_nigroup_detach( 730 const char *name, 731 int namelen) 732 { 733 struct ifnet *ifp; 734 struct sockaddr_in6 mltaddr; 735 struct in6_multi *in6m; 736 737 bzero(&mltaddr, sizeof(mltaddr)); 738 mltaddr.sin6_family = AF_INET6; 739 mltaddr.sin6_len = sizeof(struct sockaddr_in6); 740 if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0) 741 return; 742 743 ifnet_head_lock_shared(); 744 TAILQ_FOREACH(ifp, &ifnet_head, if_list) { 745 mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 746 ifnet_lock_shared(ifp); 747 IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m); 748 ifnet_lock_done(ifp); 749 if (in6m) 750 in6_delmulti(in6m, 0); 751 } 752 ifnet_head_done(); 753 } 754 755 /* 756 * XXX multiple loopback interface needs more care. for instance, 757 * nodelocal address needs to be configured onto only one of them. 758 * XXX multiple link-local address case 759 */ 760 void 761 in6_ifattach( 762 struct ifnet *ifp, 763 struct ifnet *altifp, /* secondary EUI64 source */ 764 struct in6_aliasreq *ifra) 765 { 766 static size_t if_indexlim = 8; 767 struct in6_ifaddr *ia; 768 struct in6_addr in6; 769 770 /* 771 * We have some arrays that should be indexed by if_index. 772 * since if_index will grow dynamically, they should grow too. 773 * struct in6_ifstat **in6_ifstat 774 * struct icmp6_ifstat **icmp6_ifstat 775 */ 776 if (in6_ifstat == NULL || icmp6_ifstat == NULL || 777 if_index >= if_indexlim) { 778 size_t n; 779 caddr_t q; 780 size_t olim; 781 782 olim = if_indexlim; 783 while (if_index >= if_indexlim) 784 if_indexlim <<= 1; 785 786 /* grow in6_ifstat */ 787 n = if_indexlim * sizeof(struct in6_ifstat *); 788 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 789 bzero(q, n); 790 if (in6_ifstat) { 791 bcopy((caddr_t)in6_ifstat, q, 792 olim * sizeof(struct in6_ifstat *)); 793 FREE((caddr_t)in6_ifstat, M_IFADDR); 794 } 795 in6_ifstat = (struct in6_ifstat **)q; 796 in6_ifstatmax = if_indexlim; 797 798 /* grow icmp6_ifstat */ 799 n = if_indexlim * sizeof(struct icmp6_ifstat *); 800 q = (caddr_t)_MALLOC(n, M_IFADDR, M_WAITOK); 801 bzero(q, n); 802 if (icmp6_ifstat) { 803 bcopy((caddr_t)icmp6_ifstat, q, 804 olim * sizeof(struct icmp6_ifstat *)); 805 FREE((caddr_t)icmp6_ifstat, M_IFADDR); 806 } 807 icmp6_ifstat = (struct icmp6_ifstat **)q; 808 icmp6_ifstatmax = if_indexlim; 809 } 810 811 /* initialize NDP variables */ 812 nd6_ifattach(ifp); 813 814 /* initialize scope identifiers */ 815 scope6_ifattach(ifp); 816 817 /* 818 * quirks based on interface type 819 */ 820 switch (ifp->if_type) { 821 #if IFT_STF 822 case IFT_STF: 823 /* 824 * 6to4 interface is a very special kind of beast. 825 * no multicast, no linklocal. RFC2529 specifies how to make 826 * linklocals for 6to4 interface, but there's no use and 827 * it is rather harmful to have one. 828 */ 829 goto statinit; 830 #endif 831 default: 832 break; 833 } 834 835 /* 836 * usually, we require multicast capability to the interface 837 */ 838 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 839 log(LOG_INFO, "in6_ifattach: " 840 "%s is not multicast capable, IPv6 not enabled\n", 841 if_name(ifp)); 842 return; 843 } 844 845 /* 846 * assign loopback address for loopback interface. 847 * XXX multiple loopback interface case. 848 */ 849 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 850 struct in6_ifaddr *ia6 = NULL; 851 in6 = in6addr_loopback; 852 if ((ia6 = in6ifa_ifpwithaddr(ifp, &in6)) == NULL) { 853 if (in6_ifattach_loopback(ifp) != 0) 854 return; 855 } 856 else { 857 ifafree(&ia6->ia_ifa); 858 } 859 } 860 861 /* 862 * assign a link-local address, if there's none. 863 */ 864 if (ip6_auto_linklocal) { 865 ia = in6ifa_ifpforlinklocal(ifp, 0); 866 if (ia == NULL) { 867 if (in6_ifattach_linklocal(ifp, altifp, ifra) == 0) { 868 /* linklocal address assigned */ 869 } else { 870 log(LOG_INFO, "in6_ifattach: " 871 "%s failed to attach a linklocal address.\n", 872 if_name(ifp)); 873 /* failed to assign linklocal address. bark? */ 874 } 875 } 876 } 877 878 #if IFT_STF /* XXX */ 879 statinit: 880 #endif 881 882 /* update dynamically. */ 883 if (in6_maxmtu < ifp->if_mtu) 884 in6_maxmtu = ifp->if_mtu; 885 886 if (in6_ifstat[ifp->if_index] == NULL) { 887 in6_ifstat[ifp->if_index] = (struct in6_ifstat *) 888 _MALLOC(sizeof(struct in6_ifstat), M_IFADDR, M_WAITOK); 889 bzero(in6_ifstat[ifp->if_index], sizeof(struct in6_ifstat)); 890 } 891 if (icmp6_ifstat[ifp->if_index] == NULL) { 892 icmp6_ifstat[ifp->if_index] = (struct icmp6_ifstat *) 893 _MALLOC(sizeof(struct icmp6_ifstat), M_IFADDR, M_WAITOK); 894 bzero(icmp6_ifstat[ifp->if_index], sizeof(struct icmp6_ifstat)); 895 } 896 } 897 898 /* 899 * NOTE: in6_ifdetach() does not support loopback if at this moment. 900 * We don't need this function in bsdi, because interfaces are never removed 901 * from the ifnet list in bsdi. 902 */ 903 void 904 in6_ifdetach( 905 struct ifnet *ifp) 906 { 907 struct in6_ifaddr *ia, *oia, *nia; 908 struct ifaddr *ifa, *next; 909 struct rtentry *rt; 910 short rtflags; 911 struct sockaddr_in6 sin6; 912 struct in6_multi *in6m; 913 struct in6_multi *in6m_next; 914 915 /* nuke prefix list. this may try to remove some of ifaddrs as well */ 916 in6_purgeprefix(ifp); 917 918 /* remove neighbor management table */ 919 nd6_purge(ifp); 920 921 /* nuke any of IPv6 addresses we have */ 922 923 lck_mtx_lock(nd6_mutex); 924 for (ia = in6_ifaddrs; ia != NULL; ia = nia) { 925 nia = ia->ia_next; 926 if (ia->ia_ifa.ifa_ifp != ifp) 927 continue; 928 in6_purgeaddr(&ia->ia_ifa, 1); 929 } 930 lck_mtx_unlock(nd6_mutex); 931 932 ifnet_lock_exclusive(ifp); 933 934 /* undo everything done by in6_ifattach(), just in case */ 935 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) 936 { 937 next = ifa->ifa_list.tqe_next; 938 939 940 if (ifa->ifa_addr->sa_family != AF_INET6 941 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 942 continue; 943 } 944 945 ia = (struct in6_ifaddr *)ifa; 946 947 /* remove from the routing table */ 948 lck_mtx_lock(rt_mtx); 949 if ((ia->ia_flags & IFA_ROUTE) 950 && (rt = rtalloc1_locked((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 951 rtflags = rt->rt_flags; 952 rtfree_locked(rt); 953 rtrequest_locked(RTM_DELETE, 954 (struct sockaddr *)&ia->ia_addr, 955 (struct sockaddr *)&ia->ia_addr, 956 (struct sockaddr *)&ia->ia_prefixmask, 957 rtflags, (struct rtentry **)0); 958 } 959 lck_mtx_unlock(rt_mtx); 960 961 /* remove from the linked list */ 962 if_detach_ifa(ifp, &ia->ia_ifa); 963 ifafree(&ia->ia_ifa); 964 965 /* also remove from the IPv6 address chain(itojun&jinmei) */ 966 oia = ia; 967 lck_mtx_lock(nd6_mutex); 968 if (oia == (ia = in6_ifaddrs)) 969 in6_ifaddrs = ia->ia_next; 970 else { 971 while (ia->ia_next && (ia->ia_next != oia)) 972 ia = ia->ia_next; 973 if (ia->ia_next) 974 ia->ia_next = oia->ia_next; 975 else { 976 nd6log((LOG_ERR, 977 "%s: didn't unlink in6ifaddr from " 978 "list\n", if_name(ifp))); 979 } 980 } 981 lck_mtx_unlock(nd6_mutex); 982 983 ifafree(&oia->ia_ifa); 984 } 985 ifnet_lock_done(ifp); 986 987 /* 988 * remove neighbor management table. we call it twice just to make 989 * sure we nuke everything. maybe we need just one call. 990 * XXX: since the first call did not release addresses, some prefixes 991 * might remain. We should call nd6_purge() again to release the 992 * prefixes after removing all addresses above. 993 * (Or can we just delay calling nd6_purge until at this point?) 994 */ 995 nd6_purge(ifp); 996 997 /* remove route to link-local allnodes multicast (ff02::1) */ 998 bzero(&sin6, sizeof(sin6)); 999 sin6.sin6_len = sizeof(struct sockaddr_in6); 1000 sin6.sin6_family = AF_INET6; 1001 sin6.sin6_addr = in6addr_linklocal_allnodes; 1002 sin6.sin6_addr.s6_addr16[1] = htons(ifp->if_index); 1003 lck_mtx_lock(rt_mtx); 1004 rt = rtalloc1_locked((struct sockaddr *)&sin6, 0, 0UL); 1005 if (rt && rt->rt_ifp == ifp) { 1006 rtrequest_locked(RTM_DELETE, (struct sockaddr *)rt_key(rt), 1007 rt->rt_gateway, rt_mask(rt), rt->rt_flags, 0); 1008 rtfree_locked(rt); 1009 } 1010 lck_mtx_unlock(rt_mtx); 1011 } 1012 1013 void 1014 in6_get_tmpifid( 1015 struct ifnet *ifp, 1016 u_int8_t *retbuf, 1017 const u_int8_t *baseid, 1018 int generate) 1019 { 1020 u_int8_t nullbuf[8]; 1021 struct nd_ifinfo *ndi = &nd_ifinfo[ifp->if_index]; 1022 1023 bzero(nullbuf, sizeof(nullbuf)); 1024 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 1025 /* we've never created a random ID. Create a new one. */ 1026 generate = 1; 1027 } 1028 1029 if (generate) { 1030 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 1031 1032 /* generate_tmp_ifid will update seedn and buf */ 1033 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 1034 ndi->randomid); 1035 } 1036 bcopy(ndi->randomid, retbuf, 8); 1037 } 1038 1039 extern size_t nd_ifinfo_indexlim; 1040 extern int ip6_use_tempaddr; 1041 void 1042 in6_tmpaddrtimer( 1043 void *ignored_arg) 1044 { 1045 int i; 1046 struct nd_ifinfo *ndi; 1047 u_int8_t nullbuf[8]; 1048 int s = splnet(); 1049 1050 timeout(in6_tmpaddrtimer, (caddr_t)0, 1051 (ip6_temp_preferred_lifetime - ip6_desync_factor - 1052 ip6_temp_regen_advance) * hz); 1053 1054 if (ip6_use_tempaddr) { 1055 1056 bzero(nullbuf, sizeof(nullbuf)); 1057 for (i = 1; i < nd_ifinfo_indexlim + 1; i++) { 1058 ndi = &nd_ifinfo[i]; 1059 if (ndi->flags != ND6_IFF_PERFORMNUD) 1060 continue; 1061 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 1062 /* 1063 * We've been generating a random ID on this interface. 1064 * Create a new one. 1065 */ 1066 (void)generate_tmp_ifid(ndi->randomseed0, 1067 ndi->randomseed1, 1068 ndi->randomid); 1069 } 1070 } 1071 } 1072 1073 splx(s); 1074 }
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