in6_ifattach.c revision 180291
1/*- 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 30 */ 31 32#include <sys/cdefs.h> 33__FBSDID("$FreeBSD: head/sys/netinet6/in6_ifattach.c 180291 2008-07-05 13:10:10Z rwatson $"); 34 35#include <sys/param.h> 36#include <sys/systm.h> 37#include <sys/malloc.h> 38#include <sys/socket.h> 39#include <sys/sockio.h> 40#include <sys/kernel.h> 41#include <sys/syslog.h> 42#include <sys/md5.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 63unsigned long in6_maxmtu = 0; 64 65#ifdef IP6_AUTO_LINKLOCAL 66int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 67#else 68int ip6_auto_linklocal = 1; /* enable by default */ 69#endif 70 71struct callout in6_tmpaddrtimer_ch; 72 73extern struct inpcbinfo udbinfo; 74extern struct inpcbinfo ripcbinfo; 75 76static int get_rand_ifid(struct ifnet *, struct in6_addr *); 77static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 78static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 79static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 80static int in6_ifattach_loopback(struct ifnet *); 81static void in6_purgemaddrs(struct ifnet *); 82 83#define EUI64_GBIT 0x01 84#define EUI64_UBIT 0x02 85#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 86#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 87#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 88#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 89#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 90 91#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 92#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 93 94/* 95 * Generate a last-resort interface identifier, when the machine has no 96 * IEEE802/EUI64 address sources. 97 * The goal here is to get an interface identifier that is 98 * (1) random enough and (2) does not change across reboot. 99 * We currently use MD5(hostname) for it. 100 * 101 * in6 - upper 64bits are preserved 102 */ 103static int 104get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 105{ 106 MD5_CTX ctxt; 107 u_int8_t digest[16]; 108 int hostnamelen; 109 110 mtx_lock(&hostname_mtx); 111 hostnamelen = strlen(hostname); 112#if 0 113 /* we need at least several letters as seed for ifid */ 114 if (hostnamelen < 3) 115 return -1; 116#endif 117 118 /* generate 8 bytes of pseudo-random value. */ 119 bzero(&ctxt, sizeof(ctxt)); 120 MD5Init(&ctxt); 121 MD5Update(&ctxt, hostname, hostnamelen); 122 mtx_unlock(&hostname_mtx); 123 MD5Final(digest, &ctxt); 124 125 /* assumes sizeof(digest) > sizeof(ifid) */ 126 bcopy(digest, &in6->s6_addr[8], 8); 127 128 /* make sure to set "u" bit to local, and "g" bit to individual. */ 129 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 130 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 131 132 /* convert EUI64 into IPv6 interface identifier */ 133 EUI64_TO_IFID(in6); 134 135 return 0; 136} 137 138static int 139generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 140{ 141 MD5_CTX ctxt; 142 u_int8_t seed[16], digest[16], nullbuf[8]; 143 u_int32_t val32; 144 145 /* If there's no history, start with a random seed. */ 146 bzero(nullbuf, sizeof(nullbuf)); 147 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 148 int i; 149 150 for (i = 0; i < 2; i++) { 151 val32 = arc4random(); 152 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 153 } 154 } else 155 bcopy(seed0, seed, 8); 156 157 /* copy the right-most 64-bits of the given address */ 158 /* XXX assumption on the size of IFID */ 159 bcopy(seed1, &seed[8], 8); 160 161 if (0) { /* for debugging purposes only */ 162 int i; 163 164 printf("generate_tmp_ifid: new randomized ID from: "); 165 for (i = 0; i < 16; i++) 166 printf("%02x", seed[i]); 167 printf(" "); 168 } 169 170 /* generate 16 bytes of pseudo-random value. */ 171 bzero(&ctxt, sizeof(ctxt)); 172 MD5Init(&ctxt); 173 MD5Update(&ctxt, seed, sizeof(seed)); 174 MD5Final(digest, &ctxt); 175 176 /* 177 * RFC 3041 3.2.1. (3) 178 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 179 * left-most bit is numbered 0) to zero. 180 */ 181 bcopy(digest, ret, 8); 182 ret[0] &= ~EUI64_UBIT; 183 184 /* 185 * XXX: we'd like to ensure that the generated value is not zero 186 * for simplicity. If the caclculated digest happens to be zero, 187 * use a random non-zero value as the last resort. 188 */ 189 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 190 nd6log((LOG_INFO, 191 "generate_tmp_ifid: computed MD5 value is zero.\n")); 192 193 val32 = arc4random(); 194 val32 = 1 + (val32 % (0xffffffff - 1)); 195 } 196 197 /* 198 * RFC 3041 3.2.1. (4) 199 * Take the rightmost 64-bits of the MD5 digest and save them in 200 * stable storage as the history value to be used in the next 201 * iteration of the algorithm. 202 */ 203 bcopy(&digest[8], seed0, 8); 204 205 if (0) { /* for debugging purposes only */ 206 int i; 207 208 printf("to: "); 209 for (i = 0; i < 16; i++) 210 printf("%02x", digest[i]); 211 printf("\n"); 212 } 213 214 return 0; 215} 216 217/* 218 * Get interface identifier for the specified interface. 219 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 220 * 221 * in6 - upper 64bits are preserved 222 */ 223int 224in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 225{ 226 struct ifaddr *ifa; 227 struct sockaddr_dl *sdl; 228 u_int8_t *addr; 229 size_t addrlen; 230 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 231 static u_int8_t allone[8] = 232 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 233 234 for (ifa = ifp->if_addrlist.tqh_first; 235 ifa; 236 ifa = ifa->ifa_list.tqe_next) { 237 if (ifa->ifa_addr->sa_family != AF_LINK) 238 continue; 239 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 240 if (sdl == NULL) 241 continue; 242 if (sdl->sdl_alen == 0) 243 continue; 244 245 goto found; 246 } 247 248 return -1; 249 250found: 251 addr = LLADDR(sdl); 252 addrlen = sdl->sdl_alen; 253 254 /* get EUI64 */ 255 switch (ifp->if_type) { 256 case IFT_ETHER: 257 case IFT_FDDI: 258 case IFT_ISO88025: 259 case IFT_ATM: 260 case IFT_IEEE1394: 261#ifdef IFT_IEEE80211 262 case IFT_IEEE80211: 263#endif 264 /* IEEE802/EUI64 cases - what others? */ 265 /* IEEE1394 uses 16byte length address starting with EUI64 */ 266 if (addrlen > 8) 267 addrlen = 8; 268 269 /* look at IEEE802/EUI64 only */ 270 if (addrlen != 8 && addrlen != 6) 271 return -1; 272 273 /* 274 * check for invalid MAC address - on bsdi, we see it a lot 275 * since wildboar configures all-zero MAC on pccard before 276 * card insertion. 277 */ 278 if (bcmp(addr, allzero, addrlen) == 0) 279 return -1; 280 if (bcmp(addr, allone, addrlen) == 0) 281 return -1; 282 283 /* make EUI64 address */ 284 if (addrlen == 8) 285 bcopy(addr, &in6->s6_addr[8], 8); 286 else if (addrlen == 6) { 287 in6->s6_addr[8] = addr[0]; 288 in6->s6_addr[9] = addr[1]; 289 in6->s6_addr[10] = addr[2]; 290 in6->s6_addr[11] = 0xff; 291 in6->s6_addr[12] = 0xfe; 292 in6->s6_addr[13] = addr[3]; 293 in6->s6_addr[14] = addr[4]; 294 in6->s6_addr[15] = addr[5]; 295 } 296 break; 297 298 case IFT_ARCNET: 299 if (addrlen != 1) 300 return -1; 301 if (!addr[0]) 302 return -1; 303 304 bzero(&in6->s6_addr[8], 8); 305 in6->s6_addr[15] = addr[0]; 306 307 /* 308 * due to insufficient bitwidth, we mark it local. 309 */ 310 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 311 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 312 break; 313 314 case IFT_GIF: 315#ifdef IFT_STF 316 case IFT_STF: 317#endif 318 /* 319 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 320 * however, IPv4 address is not very suitable as unique 321 * identifier source (can be renumbered). 322 * we don't do this. 323 */ 324 return -1; 325 326 default: 327 return -1; 328 } 329 330 /* sanity check: g bit must not indicate "group" */ 331 if (EUI64_GROUP(in6)) 332 return -1; 333 334 /* convert EUI64 into IPv6 interface identifier */ 335 EUI64_TO_IFID(in6); 336 337 /* 338 * sanity check: ifid must not be all zero, avoid conflict with 339 * subnet router anycast 340 */ 341 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 342 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 343 return -1; 344 } 345 346 return 0; 347} 348 349/* 350 * Get interface identifier for the specified interface. If it is not 351 * available on ifp0, borrow interface identifier from other information 352 * sources. 353 * 354 * altifp - secondary EUI64 source 355 */ 356static int 357get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 358 struct in6_addr *in6) 359{ 360 struct ifnet *ifp; 361 362 /* first, try to get it from the interface itself */ 363 if (in6_get_hw_ifid(ifp0, in6) == 0) { 364 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 365 if_name(ifp0))); 366 goto success; 367 } 368 369 /* try secondary EUI64 source. this basically is for ATM PVC */ 370 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 371 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 372 if_name(ifp0), if_name(altifp))); 373 goto success; 374 } 375 376 /* next, try to get it from some other hardware interface */ 377 IFNET_RLOCK(); 378 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 379 if (ifp == ifp0) 380 continue; 381 if (in6_get_hw_ifid(ifp, in6) != 0) 382 continue; 383 384 /* 385 * to borrow ifid from other interface, ifid needs to be 386 * globally unique 387 */ 388 if (IFID_UNIVERSAL(in6)) { 389 nd6log((LOG_DEBUG, 390 "%s: borrow interface identifier from %s\n", 391 if_name(ifp0), if_name(ifp))); 392 IFNET_RUNLOCK(); 393 goto success; 394 } 395 } 396 IFNET_RUNLOCK(); 397 398 /* last resort: get from random number source */ 399 if (get_rand_ifid(ifp, in6) == 0) { 400 nd6log((LOG_DEBUG, 401 "%s: interface identifier generated by random number\n", 402 if_name(ifp0))); 403 goto success; 404 } 405 406 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 407 return -1; 408 409success: 410 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 411 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 412 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 413 in6->s6_addr[14], in6->s6_addr[15])); 414 return 0; 415} 416 417/* 418 * altifp - secondary EUI64 source 419 */ 420static int 421in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 422{ 423 struct in6_ifaddr *ia; 424 struct in6_aliasreq ifra; 425 struct nd_prefixctl pr0; 426 int i, error; 427 428 /* 429 * configure link-local address. 430 */ 431 bzero(&ifra, sizeof(ifra)); 432 433 /* 434 * in6_update_ifa() does not use ifra_name, but we accurately set it 435 * for safety. 436 */ 437 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 438 439 ifra.ifra_addr.sin6_family = AF_INET6; 440 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 441 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 442 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 443 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 444 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 445 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 446 } else { 447 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 448 nd6log((LOG_ERR, 449 "%s: no ifid available\n", if_name(ifp))); 450 return (-1); 451 } 452 } 453 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 454 return (-1); 455 456 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 457 ifra.ifra_prefixmask.sin6_family = AF_INET6; 458 ifra.ifra_prefixmask.sin6_addr = in6mask64; 459 /* link-local addresses should NEVER expire. */ 460 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 461 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 462 463 /* 464 * Now call in6_update_ifa() to do a bunch of procedures to configure 465 * a link-local address. We can set the 3rd argument to NULL, because 466 * we know there's no other link-local address on the interface 467 * and therefore we are adding one (instead of updating one). 468 */ 469 if ((error = in6_update_ifa(ifp, &ifra, NULL, 470 IN6_IFAUPDATE_DADDELAY)) != 0) { 471 /* 472 * XXX: When the interface does not support IPv6, this call 473 * would fail in the SIOCSIFADDR ioctl. I believe the 474 * notification is rather confusing in this case, so just 475 * suppress it. (jinmei@kame.net 20010130) 476 */ 477 if (error != EAFNOSUPPORT) 478 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 479 "configure a link-local address on %s " 480 "(errno=%d)\n", 481 if_name(ifp), error)); 482 return (-1); 483 } 484 485 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 486#ifdef DIAGNOSTIC 487 if (!ia) { 488 panic("ia == NULL in in6_ifattach_linklocal"); 489 /* NOTREACHED */ 490 } 491#endif 492 493 /* 494 * Make the link-local prefix (fe80::%link/64) as on-link. 495 * Since we'd like to manage prefixes separately from addresses, 496 * we make an ND6 prefix structure for the link-local prefix, 497 * and add it to the prefix list as a never-expire prefix. 498 * XXX: this change might affect some existing code base... 499 */ 500 bzero(&pr0, sizeof(pr0)); 501 pr0.ndpr_ifp = ifp; 502 /* this should be 64 at this moment. */ 503 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 504 pr0.ndpr_prefix = ifra.ifra_addr; 505 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 506 for (i = 0; i < 4; i++) { 507 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 508 in6mask64.s6_addr32[i]; 509 } 510 /* 511 * Initialize parameters. The link-local prefix must always be 512 * on-link, and its lifetimes never expire. 513 */ 514 pr0.ndpr_raf_onlink = 1; 515 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 516 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 517 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 518 /* 519 * Since there is no other link-local addresses, nd6_prefix_lookup() 520 * probably returns NULL. However, we cannot always expect the result. 521 * For example, if we first remove the (only) existing link-local 522 * address, and then reconfigure another one, the prefix is still 523 * valid with referring to the old link-local address. 524 */ 525 if (nd6_prefix_lookup(&pr0) == NULL) { 526 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 527 return (error); 528 } 529 530 return 0; 531} 532 533/* 534 * ifp - must be IFT_LOOP 535 */ 536static int 537in6_ifattach_loopback(struct ifnet *ifp) 538{ 539 struct in6_aliasreq ifra; 540 int error; 541 542 bzero(&ifra, sizeof(ifra)); 543 544 /* 545 * in6_update_ifa() does not use ifra_name, but we accurately set it 546 * for safety. 547 */ 548 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 549 550 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 551 ifra.ifra_prefixmask.sin6_family = AF_INET6; 552 ifra.ifra_prefixmask.sin6_addr = in6mask128; 553 554 /* 555 * Always initialize ia_dstaddr (= broadcast address) to loopback 556 * address. Follows IPv4 practice - see in_ifinit(). 557 */ 558 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 559 ifra.ifra_dstaddr.sin6_family = AF_INET6; 560 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 561 562 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 563 ifra.ifra_addr.sin6_family = AF_INET6; 564 ifra.ifra_addr.sin6_addr = in6addr_loopback; 565 566 /* the loopback address should NEVER expire. */ 567 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 568 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 569 570 /* we don't need to perform DAD on loopback interfaces. */ 571 ifra.ifra_flags |= IN6_IFF_NODAD; 572 573 /* skip registration to the prefix list. XXX should be temporary. */ 574 ifra.ifra_flags |= IN6_IFF_NOPFX; 575 576 /* 577 * We are sure that this is a newly assigned address, so we can set 578 * NULL to the 3rd arg. 579 */ 580 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 581 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 582 "the loopback address on %s (errno=%d)\n", 583 if_name(ifp), error)); 584 return (-1); 585 } 586 587 return 0; 588} 589 590/* 591 * compute NI group address, based on the current hostname setting. 592 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 593 * 594 * when ifp == NULL, the caller is responsible for filling scopeid. 595 */ 596int 597in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 598 struct in6_addr *in6) 599{ 600 const char *p; 601 u_char *q; 602 MD5_CTX ctxt; 603 u_int8_t digest[16]; 604 char l; 605 char n[64]; /* a single label must not exceed 63 chars */ 606 607 if (!namelen || !name) 608 return -1; 609 610 p = name; 611 while (p && *p && *p != '.' && p - name < namelen) 612 p++; 613 if (p - name > sizeof(n) - 1) 614 return -1; /* label too long */ 615 l = p - name; 616 strncpy(n, name, l); 617 n[(int)l] = '\0'; 618 for (q = n; *q; q++) { 619 if ('A' <= *q && *q <= 'Z') 620 *q = *q - 'A' + 'a'; 621 } 622 623 /* generate 8 bytes of pseudo-random value. */ 624 bzero(&ctxt, sizeof(ctxt)); 625 MD5Init(&ctxt); 626 MD5Update(&ctxt, &l, sizeof(l)); 627 MD5Update(&ctxt, n, l); 628 MD5Final(digest, &ctxt); 629 630 bzero(in6, sizeof(*in6)); 631 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 632 in6->s6_addr8[11] = 2; 633 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 634 if (in6_setscope(in6, ifp, NULL)) 635 return (-1); /* XXX: should not fail */ 636 637 return 0; 638} 639 640/* 641 * XXX multiple loopback interface needs more care. for instance, 642 * nodelocal address needs to be configured onto only one of them. 643 * XXX multiple link-local address case 644 * 645 * altifp - secondary EUI64 source 646 */ 647void 648in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 649{ 650 struct in6_ifaddr *ia; 651 struct in6_addr in6; 652 653 /* some of the interfaces are inherently not IPv6 capable */ 654 switch (ifp->if_type) { 655 case IFT_PFLOG: 656 case IFT_PFSYNC: 657 case IFT_CARP: 658 return; 659 } 660 661 /* 662 * quirks based on interface type 663 */ 664 switch (ifp->if_type) { 665#ifdef IFT_STF 666 case IFT_STF: 667 /* 668 * 6to4 interface is a very special kind of beast. 669 * no multicast, no linklocal. RFC2529 specifies how to make 670 * linklocals for 6to4 interface, but there's no use and 671 * it is rather harmful to have one. 672 */ 673 goto statinit; 674#endif 675 default: 676 break; 677 } 678 679 /* 680 * usually, we require multicast capability to the interface 681 */ 682 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 683 nd6log((LOG_INFO, "in6_ifattach: " 684 "%s is not multicast capable, IPv6 not enabled\n", 685 if_name(ifp))); 686 return; 687 } 688 689 /* 690 * assign loopback address for loopback interface. 691 * XXX multiple loopback interface case. 692 */ 693 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 694 in6 = in6addr_loopback; 695 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 696 if (in6_ifattach_loopback(ifp) != 0) 697 return; 698 } 699 } 700 701 /* 702 * assign a link-local address, if there's none. 703 */ 704 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 705 ia = in6ifa_ifpforlinklocal(ifp, 0); 706 if (ia == NULL) { 707 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 708 /* linklocal address assigned */ 709 } else { 710 /* failed to assign linklocal address. bark? */ 711 } 712 } 713 } 714 715#ifdef IFT_STF /* XXX */ 716statinit: 717#endif 718 719 /* update dynamically. */ 720 if (in6_maxmtu < ifp->if_mtu) 721 in6_maxmtu = ifp->if_mtu; 722} 723 724/* 725 * NOTE: in6_ifdetach() does not support loopback if at this moment. 726 * We don't need this function in bsdi, because interfaces are never removed 727 * from the ifnet list in bsdi. 728 */ 729void 730in6_ifdetach(struct ifnet *ifp) 731{ 732 struct in6_ifaddr *ia, *oia; 733 struct ifaddr *ifa, *next; 734 struct rtentry *rt; 735 short rtflags; 736 struct sockaddr_in6 sin6; 737 struct in6_multi_mship *imm; 738 739 /* remove neighbor management table */ 740 nd6_purge(ifp); 741 742 /* nuke any of IPv6 addresses we have */ 743 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 744 next = ifa->ifa_list.tqe_next; 745 if (ifa->ifa_addr->sa_family != AF_INET6) 746 continue; 747 in6_purgeaddr(ifa); 748 } 749 750 /* undo everything done by in6_ifattach(), just in case */ 751 for (ifa = ifp->if_addrlist.tqh_first; ifa; ifa = next) { 752 next = ifa->ifa_list.tqe_next; 753 754 if (ifa->ifa_addr->sa_family != AF_INET6 755 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 756 continue; 757 } 758 759 ia = (struct in6_ifaddr *)ifa; 760 761 /* 762 * leave from multicast groups we have joined for the interface 763 */ 764 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 765 LIST_REMOVE(imm, i6mm_chain); 766 in6_leavegroup(imm); 767 } 768 769 /* remove from the routing table */ 770 if ((ia->ia_flags & IFA_ROUTE) && 771 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 772 rtflags = rt->rt_flags; 773 rtfree(rt); 774 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 775 (struct sockaddr *)&ia->ia_addr, 776 (struct sockaddr *)&ia->ia_prefixmask, 777 rtflags, (struct rtentry **)0); 778 } 779 780 /* remove from the linked list */ 781 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 782 IFAFREE(&ia->ia_ifa); 783 784 /* also remove from the IPv6 address chain(itojun&jinmei) */ 785 oia = ia; 786 if (oia == (ia = in6_ifaddr)) 787 in6_ifaddr = ia->ia_next; 788 else { 789 while (ia->ia_next && (ia->ia_next != oia)) 790 ia = ia->ia_next; 791 if (ia->ia_next) 792 ia->ia_next = oia->ia_next; 793 else { 794 nd6log((LOG_ERR, 795 "%s: didn't unlink in6ifaddr from list\n", 796 if_name(ifp))); 797 } 798 } 799 800 IFAFREE(&oia->ia_ifa); 801 } 802 803 in6_pcbpurgeif0(&udbinfo, ifp); 804 in6_pcbpurgeif0(&ripcbinfo, ifp); 805 /* leave from all multicast groups joined */ 806 in6_purgemaddrs(ifp); 807 808 /* 809 * remove neighbor management table. we call it twice just to make 810 * sure we nuke everything. maybe we need just one call. 811 * XXX: since the first call did not release addresses, some prefixes 812 * might remain. We should call nd6_purge() again to release the 813 * prefixes after removing all addresses above. 814 * (Or can we just delay calling nd6_purge until at this point?) 815 */ 816 nd6_purge(ifp); 817 818 /* remove route to link-local allnodes multicast (ff02::1) */ 819 bzero(&sin6, sizeof(sin6)); 820 sin6.sin6_len = sizeof(struct sockaddr_in6); 821 sin6.sin6_family = AF_INET6; 822 sin6.sin6_addr = in6addr_linklocal_allnodes; 823 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 824 /* XXX: should not fail */ 825 return; 826 /* XXX grab lock first to avoid LOR */ 827 if (rt_tables[0][AF_INET6] != NULL) { 828 RADIX_NODE_HEAD_LOCK(rt_tables[0][AF_INET6]); 829 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 830 if (rt) { 831 if (rt->rt_ifp == ifp) 832 rtexpunge(rt); 833 RTFREE_LOCKED(rt); 834 } 835 RADIX_NODE_HEAD_UNLOCK(rt_tables[0][AF_INET6]); 836 } 837} 838 839int 840in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 841 const u_int8_t *baseid, int generate) 842{ 843 u_int8_t nullbuf[8]; 844 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 845 846 bzero(nullbuf, sizeof(nullbuf)); 847 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 848 /* we've never created a random ID. Create a new one. */ 849 generate = 1; 850 } 851 852 if (generate) { 853 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 854 855 /* generate_tmp_ifid will update seedn and buf */ 856 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 857 ndi->randomid); 858 } 859 bcopy(ndi->randomid, retbuf, 8); 860 861 return (0); 862} 863 864void 865in6_tmpaddrtimer(void *ignored_arg) 866{ 867 struct nd_ifinfo *ndi; 868 u_int8_t nullbuf[8]; 869 struct ifnet *ifp; 870 int s = splnet(); 871 872 callout_reset(&in6_tmpaddrtimer_ch, 873 (ip6_temp_preferred_lifetime - ip6_desync_factor - 874 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 875 876 bzero(nullbuf, sizeof(nullbuf)); 877 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 878 ndi = ND_IFINFO(ifp); 879 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 880 /* 881 * We've been generating a random ID on this interface. 882 * Create a new one. 883 */ 884 (void)generate_tmp_ifid(ndi->randomseed0, 885 ndi->randomseed1, ndi->randomid); 886 } 887 } 888 889 splx(s); 890} 891 892static void 893in6_purgemaddrs(struct ifnet *ifp) 894{ 895 struct in6_multi *in6m; 896 struct in6_multi *oin6m; 897 898#ifdef DIAGNOSTIC 899 printf("%s: purging ifp %p\n", __func__, ifp); 900#endif 901 902 IFF_LOCKGIANT(ifp); 903 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 904 if (in6m->in6m_ifp == ifp) 905 in6_delmulti(in6m); 906 } 907 IFF_UNLOCKGIANT(ifp); 908} 909