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sys/netinet6/in6_ifattach.c
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1 /* $FreeBSD: releng/6.1/sys/netinet6/in6_ifattach.c 158179 2006-04-30 16:44:43Z cvs2svn $ */ 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 unsigned long in6_maxmtu = 0; 64 65 #ifdef IP6_AUTO_LINKLOCAL 66 int ip6_auto_linklocal = IP6_AUTO_LINKLOCAL; 67 #else 68 int ip6_auto_linklocal = 1; /* enable by default */ 69 #endif 70 71 struct callout in6_tmpaddrtimer_ch; 72 73 extern struct inpcbinfo udbinfo; 74 extern struct inpcbinfo ripcbinfo; 75 76 static int get_rand_ifid __P((struct ifnet *, struct in6_addr *)); 77 static int generate_tmp_ifid __P((u_int8_t *, const u_int8_t *, u_int8_t *)); 78 static int get_ifid __P((struct ifnet *, struct ifnet *, struct in6_addr *)); 79 static int in6_ifattach_linklocal __P((struct ifnet *, struct ifnet *)); 80 static int in6_ifattach_loopback __P((struct ifnet *)); 81 82 #define EUI64_GBIT 0x01 83 #define EUI64_UBIT 0x02 84 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 85 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 86 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 87 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 88 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 89 90 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 91 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 92 93 /* 94 * Generate a last-resort interface identifier, when the machine has no 95 * IEEE802/EUI64 address sources. 96 * The goal here is to get an interface identifier that is 97 * (1) random enough and (2) does not change across reboot. 98 * We currently use MD5(hostname) for it. 99 */ 100 static int 101 get_rand_ifid(ifp, in6) 102 struct ifnet *ifp; 103 struct in6_addr *in6; /* upper 64bits are preserved */ 104 { 105 MD5_CTX ctxt; 106 u_int8_t digest[16]; 107 int hostnamelen = strlen(hostname); 108 109 #if 0 110 /* we need at least several letters as seed for ifid */ 111 if (hostnamelen < 3) 112 return -1; 113 #endif 114 115 /* generate 8 bytes of pseudo-random value. */ 116 bzero(&ctxt, sizeof(ctxt)); 117 MD5Init(&ctxt); 118 MD5Update(&ctxt, hostname, hostnamelen); 119 MD5Final(digest, &ctxt); 120 121 /* assumes sizeof(digest) > sizeof(ifid) */ 122 bcopy(digest, &in6->s6_addr[8], 8); 123 124 /* make sure to set "u" bit to local, and "g" bit to individual. */ 125 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 126 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 127 128 /* convert EUI64 into IPv6 interface identifier */ 129 EUI64_TO_IFID(in6); 130 131 return 0; 132 } 133 134 static int 135 generate_tmp_ifid(seed0, seed1, ret) 136 u_int8_t *seed0, *ret; 137 const u_int8_t *seed1; 138 { 139 MD5_CTX ctxt; 140 u_int8_t seed[16], digest[16], nullbuf[8]; 141 u_int32_t val32; 142 143 /* If there's no hisotry, start with a random seed. */ 144 bzero(nullbuf, sizeof(nullbuf)); 145 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 146 int i; 147 148 for (i = 0; i < 2; i++) { 149 val32 = arc4random(); 150 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 151 } 152 } else 153 bcopy(seed0, seed, 8); 154 155 /* copy the right-most 64-bits of the given address */ 156 /* XXX assumption on the size of IFID */ 157 bcopy(seed1, &seed[8], 8); 158 159 if (0) { /* for debugging purposes only */ 160 int i; 161 162 printf("generate_tmp_ifid: new randomized ID from: "); 163 for (i = 0; i < 16; i++) 164 printf("%02x", seed[i]); 165 printf(" "); 166 } 167 168 /* generate 16 bytes of pseudo-random value. */ 169 bzero(&ctxt, sizeof(ctxt)); 170 MD5Init(&ctxt); 171 MD5Update(&ctxt, seed, sizeof(seed)); 172 MD5Final(digest, &ctxt); 173 174 /* 175 * RFC 3041 3.2.1. (3) 176 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 177 * left-most bit is numbered 0) to zero. 178 */ 179 bcopy(digest, ret, 8); 180 ret[0] &= ~EUI64_UBIT; 181 182 /* 183 * XXX: we'd like to ensure that the generated value is not zero 184 * for simplicity. If the caclculated digest happens to be zero, 185 * use a random non-zero value as the last resort. 186 */ 187 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 188 nd6log((LOG_INFO, 189 "generate_tmp_ifid: computed MD5 value is zero.\n")); 190 191 val32 = arc4random(); 192 val32 = 1 + (val32 % (0xffffffff - 1)); 193 } 194 195 /* 196 * RFC 3041 3.2.1. (4) 197 * Take the rightmost 64-bits of the MD5 digest and save them in 198 * stable storage as the history value to be used in the next 199 * iteration of the algorithm. 200 */ 201 bcopy(&digest[8], seed0, 8); 202 203 if (0) { /* for debugging purposes only */ 204 int i; 205 206 printf("to: "); 207 for (i = 0; i < 16; i++) 208 printf("%02x", digest[i]); 209 printf("\n"); 210 } 211 212 return 0; 213 } 214 215 /* 216 * Get interface identifier for the specified interface. 217 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 218 */ 219 int 220 in6_get_hw_ifid(ifp, in6) 221 struct ifnet *ifp; 222 struct in6_addr *in6; /* upper 64bits are preserved */ 223 { 224 struct ifaddr *ifa; 225 struct sockaddr_dl *sdl; 226 u_int8_t *addr; 227 size_t addrlen; 228 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 229 static u_int8_t allone[8] = 230 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 231 232 for (ifa = ifp->if_addrlist.tqh_first; 233 ifa; 234 ifa = ifa->ifa_list.tqe_next) { 235 if (ifa->ifa_addr->sa_family != AF_LINK) 236 continue; 237 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 238 if (sdl == NULL) 239 continue; 240 if (sdl->sdl_alen == 0) 241 continue; 242 243 goto found; 244 } 245 246 return -1; 247 248 found: 249 addr = LLADDR(sdl); 250 addrlen = sdl->sdl_alen; 251 252 /* get EUI64 */ 253 switch (ifp->if_type) { 254 case IFT_ETHER: 255 case IFT_FDDI: 256 case IFT_ISO88025: 257 case IFT_ATM: 258 case IFT_IEEE1394: 259 #ifdef IFT_IEEE80211 260 case IFT_IEEE80211: 261 #endif 262 /* IEEE802/EUI64 cases - what others? */ 263 /* IEEE1394 uses 16byte length address starting with EUI64 */ 264 if (addrlen > 8) 265 addrlen = 8; 266 267 /* look at IEEE802/EUI64 only */ 268 if (addrlen != 8 && addrlen != 6) 269 return -1; 270 271 /* 272 * check for invalid MAC address - on bsdi, we see it a lot 273 * since wildboar configures all-zero MAC on pccard before 274 * card insertion. 275 */ 276 if (bcmp(addr, allzero, addrlen) == 0) 277 return -1; 278 if (bcmp(addr, allone, addrlen) == 0) 279 return -1; 280 281 /* make EUI64 address */ 282 if (addrlen == 8) 283 bcopy(addr, &in6->s6_addr[8], 8); 284 else if (addrlen == 6) { 285 in6->s6_addr[8] = addr[0]; 286 in6->s6_addr[9] = addr[1]; 287 in6->s6_addr[10] = addr[2]; 288 in6->s6_addr[11] = 0xff; 289 in6->s6_addr[12] = 0xfe; 290 in6->s6_addr[13] = addr[3]; 291 in6->s6_addr[14] = addr[4]; 292 in6->s6_addr[15] = addr[5]; 293 } 294 break; 295 296 case IFT_ARCNET: 297 if (addrlen != 1) 298 return -1; 299 if (!addr[0]) 300 return -1; 301 302 bzero(&in6->s6_addr[8], 8); 303 in6->s6_addr[15] = addr[0]; 304 305 /* 306 * due to insufficient bitwidth, we mark it local. 307 */ 308 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 309 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 310 break; 311 312 case IFT_GIF: 313 #ifdef IFT_STF 314 case IFT_STF: 315 #endif 316 /* 317 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 318 * however, IPv4 address is not very suitable as unique 319 * identifier source (can be renumbered). 320 * we don't do this. 321 */ 322 return -1; 323 324 default: 325 return -1; 326 } 327 328 /* sanity check: g bit must not indicate "group" */ 329 if (EUI64_GROUP(in6)) 330 return -1; 331 332 /* convert EUI64 into IPv6 interface identifier */ 333 EUI64_TO_IFID(in6); 334 335 /* 336 * sanity check: ifid must not be all zero, avoid conflict with 337 * subnet router anycast 338 */ 339 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 340 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 341 return -1; 342 } 343 344 return 0; 345 } 346 347 /* 348 * Get interface identifier for the specified interface. If it is not 349 * available on ifp0, borrow interface identifier from other information 350 * sources. 351 */ 352 static int 353 get_ifid(ifp0, altifp, in6) 354 struct ifnet *ifp0; 355 struct ifnet *altifp; /* secondary EUI64 source */ 356 struct in6_addr *in6; 357 { 358 struct ifnet *ifp; 359 360 /* first, try to get it from the interface itself */ 361 if (in6_get_hw_ifid(ifp0, in6) == 0) { 362 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 363 if_name(ifp0))); 364 goto success; 365 } 366 367 /* try secondary EUI64 source. this basically is for ATM PVC */ 368 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 369 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 370 if_name(ifp0), if_name(altifp))); 371 goto success; 372 } 373 374 /* next, try to get it from some other hardware interface */ 375 IFNET_RLOCK(); 376 for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 377 if (ifp == ifp0) 378 continue; 379 if (in6_get_hw_ifid(ifp, in6) != 0) 380 continue; 381 382 /* 383 * to borrow ifid from other interface, ifid needs to be 384 * globally unique 385 */ 386 if (IFID_UNIVERSAL(in6)) { 387 nd6log((LOG_DEBUG, 388 "%s: borrow interface identifier from %s\n", 389 if_name(ifp0), if_name(ifp))); 390 IFNET_RUNLOCK(); 391 goto success; 392 } 393 } 394 IFNET_RUNLOCK(); 395 396 /* last resort: get from random number source */ 397 if (get_rand_ifid(ifp, in6) == 0) { 398 nd6log((LOG_DEBUG, 399 "%s: interface identifier generated by random number\n", 400 if_name(ifp0))); 401 goto success; 402 } 403 404 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 405 return -1; 406 407 success: 408 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 409 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 410 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 411 in6->s6_addr[14], in6->s6_addr[15])); 412 return 0; 413 } 414 415 static int 416 in6_ifattach_linklocal(ifp, altifp) 417 struct ifnet *ifp; 418 struct ifnet *altifp; /* secondary EUI64 source */ 419 { 420 struct in6_ifaddr *ia; 421 struct in6_aliasreq ifra; 422 struct nd_prefixctl pr0; 423 int i, error; 424 425 /* 426 * configure link-local address. 427 */ 428 bzero(&ifra, sizeof(ifra)); 429 430 /* 431 * in6_update_ifa() does not use ifra_name, but we accurately set it 432 * for safety. 433 */ 434 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 435 436 ifra.ifra_addr.sin6_family = AF_INET6; 437 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 438 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 439 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 440 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 441 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 442 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 443 } else { 444 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 445 nd6log((LOG_ERR, 446 "%s: no ifid available\n", if_name(ifp))); 447 return (-1); 448 } 449 } 450 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 451 return (-1); 452 453 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 454 ifra.ifra_prefixmask.sin6_family = AF_INET6; 455 ifra.ifra_prefixmask.sin6_addr = in6mask64; 456 /* link-local addresses should NEVER expire. */ 457 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 458 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 459 460 /* 461 * Now call in6_update_ifa() to do a bunch of procedures to configure 462 * a link-local address. We can set the 3rd argument to NULL, because 463 * we know there's no other link-local address on the interface 464 * and therefore we are adding one (instead of updating one). 465 */ 466 if ((error = in6_update_ifa(ifp, &ifra, NULL, 467 IN6_IFAUPDATE_DADDELAY)) != 0) { 468 /* 469 * XXX: When the interface does not support IPv6, this call 470 * would fail in the SIOCSIFADDR ioctl. I believe the 471 * notification is rather confusing in this case, so just 472 * suppress it. (jinmei@kame.net 20010130) 473 */ 474 if (error != EAFNOSUPPORT) 475 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 476 "configure a link-local address on %s " 477 "(errno=%d)\n", 478 if_name(ifp), error)); 479 return (-1); 480 } 481 482 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 483 #ifdef DIAGNOSTIC 484 if (!ia) { 485 panic("ia == NULL in in6_ifattach_linklocal"); 486 /* NOTREACHED */ 487 } 488 #endif 489 490 /* 491 * Make the link-local prefix (fe80::%link/64) as on-link. 492 * Since we'd like to manage prefixes separately from addresses, 493 * we make an ND6 prefix structure for the link-local prefix, 494 * and add it to the prefix list as a never-expire prefix. 495 * XXX: this change might affect some existing code base... 496 */ 497 bzero(&pr0, sizeof(pr0)); 498 pr0.ndpr_ifp = ifp; 499 /* this should be 64 at this moment. */ 500 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 501 pr0.ndpr_prefix = ifra.ifra_addr; 502 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 503 for (i = 0; i < 4; i++) { 504 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 505 in6mask64.s6_addr32[i]; 506 } 507 /* 508 * Initialize parameters. The link-local prefix must always be 509 * on-link, and its lifetimes never expire. 510 */ 511 pr0.ndpr_raf_onlink = 1; 512 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 513 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 514 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 515 /* 516 * Since there is no other link-local addresses, nd6_prefix_lookup() 517 * probably returns NULL. However, we cannot always expect the result. 518 * For example, if we first remove the (only) existing link-local 519 * address, and then reconfigure another one, the prefix is still 520 * valid with referring to the old link-local address. 521 */ 522 if (nd6_prefix_lookup(&pr0) == NULL) { 523 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 524 return (error); 525 } 526 527 return 0; 528 } 529 530 static int 531 in6_ifattach_loopback(ifp) 532 struct ifnet *ifp; /* must be IFT_LOOP */ 533 { 534 struct in6_aliasreq ifra; 535 int error; 536 537 bzero(&ifra, sizeof(ifra)); 538 539 /* 540 * in6_update_ifa() does not use ifra_name, but we accurately set it 541 * for safety. 542 */ 543 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 544 545 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 546 ifra.ifra_prefixmask.sin6_family = AF_INET6; 547 ifra.ifra_prefixmask.sin6_addr = in6mask128; 548 549 /* 550 * Always initialize ia_dstaddr (= broadcast address) to loopback 551 * address. Follows IPv4 practice - see in_ifinit(). 552 */ 553 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 554 ifra.ifra_dstaddr.sin6_family = AF_INET6; 555 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 556 557 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 558 ifra.ifra_addr.sin6_family = AF_INET6; 559 ifra.ifra_addr.sin6_addr = in6addr_loopback; 560 561 /* the loopback address should NEVER expire. */ 562 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 563 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 564 565 /* we don't need to perform DAD on loopback interfaces. */ 566 ifra.ifra_flags |= IN6_IFF_NODAD; 567 568 /* skip registration to the prefix list. XXX should be temporary. */ 569 ifra.ifra_flags |= IN6_IFF_NOPFX; 570 571 /* 572 * We are sure that this is a newly assigned address, so we can set 573 * NULL to the 3rd arg. 574 */ 575 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 576 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 577 "the loopback address on %s (errno=%d)\n", 578 if_name(ifp), error)); 579 return (-1); 580 } 581 582 return 0; 583 } 584 585 /* 586 * compute NI group address, based on the current hostname setting. 587 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 588 * 589 * when ifp == NULL, the caller is responsible for filling scopeid. 590 */ 591 int 592 in6_nigroup(ifp, name, namelen, in6) 593 struct ifnet *ifp; 594 const char *name; 595 int namelen; 596 struct in6_addr *in6; 597 { 598 const char *p; 599 u_char *q; 600 MD5_CTX ctxt; 601 u_int8_t digest[16]; 602 char l; 603 char n[64]; /* a single label must not exceed 63 chars */ 604 605 if (!namelen || !name) 606 return -1; 607 608 p = name; 609 while (p && *p && *p != '.' && p - name < namelen) 610 p++; 611 if (p - name > sizeof(n) - 1) 612 return -1; /* label too long */ 613 l = p - name; 614 strncpy(n, name, l); 615 n[(int)l] = '\0'; 616 for (q = n; *q; q++) { 617 if ('A' <= *q && *q <= 'Z') 618 *q = *q - 'A' + 'a'; 619 } 620 621 /* generate 8 bytes of pseudo-random value. */ 622 bzero(&ctxt, sizeof(ctxt)); 623 MD5Init(&ctxt); 624 MD5Update(&ctxt, &l, sizeof(l)); 625 MD5Update(&ctxt, n, l); 626 MD5Final(digest, &ctxt); 627 628 bzero(in6, sizeof(*in6)); 629 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 630 in6->s6_addr8[11] = 2; 631 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 632 if (in6_setscope(in6, ifp, NULL)) 633 return (-1); /* XXX: should not fail */ 634 635 return 0; 636 } 637 638 /* 639 * XXX multiple loopback interface needs more care. for instance, 640 * nodelocal address needs to be configured onto only one of them. 641 * XXX multiple link-local address case 642 */ 643 void 644 in6_ifattach(ifp, altifp) 645 struct ifnet *ifp; 646 struct ifnet *altifp; /* secondary EUI64 source */ 647 { 648 struct in6_ifaddr *ia; 649 struct in6_addr in6; 650 651 /* some of the interfaces are inherently not IPv6 capable */ 652 switch (ifp->if_type) { 653 case IFT_PFLOG: 654 case IFT_PFSYNC: 655 case IFT_CARP: 656 return; 657 } 658 659 /* 660 * quirks based on interface type 661 */ 662 switch (ifp->if_type) { 663 #ifdef IFT_STF 664 case IFT_STF: 665 /* 666 * 6to4 interface is a very special kind of beast. 667 * no multicast, no linklocal. RFC2529 specifies how to make 668 * linklocals for 6to4 interface, but there's no use and 669 * it is rather harmful to have one. 670 */ 671 goto statinit; 672 #endif 673 default: 674 break; 675 } 676 677 /* 678 * usually, we require multicast capability to the interface 679 */ 680 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 681 nd6log((LOG_INFO, "in6_ifattach: " 682 "%s is not multicast capable, IPv6 not enabled\n", 683 if_name(ifp))); 684 return; 685 } 686 687 /* 688 * assign loopback address for loopback interface. 689 * XXX multiple loopback interface case. 690 */ 691 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 692 in6 = in6addr_loopback; 693 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 694 if (in6_ifattach_loopback(ifp) != 0) 695 return; 696 } 697 } 698 699 /* 700 * assign a link-local address, if there's none. 701 */ 702 if (ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 703 ia = in6ifa_ifpforlinklocal(ifp, 0); 704 if (ia == NULL) { 705 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 706 /* linklocal address assigned */ 707 } else { 708 /* failed to assign linklocal address. bark? */ 709 } 710 } 711 } 712 713 #ifdef IFT_STF /* XXX */ 714 statinit: 715 #endif 716 717 /* update dynamically. */ 718 if (in6_maxmtu < ifp->if_mtu) 719 in6_maxmtu = ifp->if_mtu; 720 } 721 722 /* 723 * NOTE: in6_ifdetach() does not support loopback if at this moment. 724 * We don't need this function in bsdi, because interfaces are never removed 725 * from the ifnet list in bsdi. 726 */ 727 void 728 in6_ifdetach(ifp) 729 struct ifnet *ifp; 730 { 731 struct in6_ifaddr *ia, *oia; 732 struct ifaddr *ifa, *next; 733 struct rtentry *rt; 734 short rtflags; 735 struct sockaddr_in6 sin6; 736 struct in6_multi *in6m; 737 struct in6_multi *in6m_next; 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 /* remove from the routing table */ 762 if ((ia->ia_flags & IFA_ROUTE) && 763 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 764 rtflags = rt->rt_flags; 765 rtfree(rt); 766 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 767 (struct sockaddr *)&ia->ia_addr, 768 (struct sockaddr *)&ia->ia_prefixmask, 769 rtflags, (struct rtentry **)0); 770 } 771 772 /* remove from the linked list */ 773 TAILQ_REMOVE(&ifp->if_addrlist, (struct ifaddr *)ia, ifa_list); 774 IFAFREE(&ia->ia_ifa); 775 776 /* also remove from the IPv6 address chain(itojun&jinmei) */ 777 oia = ia; 778 if (oia == (ia = in6_ifaddr)) 779 in6_ifaddr = ia->ia_next; 780 else { 781 while (ia->ia_next && (ia->ia_next != oia)) 782 ia = ia->ia_next; 783 if (ia->ia_next) 784 ia->ia_next = oia->ia_next; 785 else { 786 nd6log((LOG_ERR, 787 "%s: didn't unlink in6ifaddr from list\n", 788 if_name(ifp))); 789 } 790 } 791 792 IFAFREE(&oia->ia_ifa); 793 } 794 795 /* leave from all multicast groups joined */ 796 797 if (udbinfo.listhead != NULL) 798 in6_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp); 799 if (ripcbinfo.listhead != NULL) 800 in6_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp); 801 802 for (in6m = LIST_FIRST(&in6_multihead); in6m; in6m = in6m_next) { 803 in6m_next = LIST_NEXT(in6m, in6m_entry); 804 if (in6m->in6m_ifp != ifp) 805 continue; 806 in6_delmulti(in6m); 807 in6m = NULL; 808 } 809 810 /* 811 * remove neighbor management table. we call it twice just to make 812 * sure we nuke everything. maybe we need just one call. 813 * XXX: since the first call did not release addresses, some prefixes 814 * might remain. We should call nd6_purge() again to release the 815 * prefixes after removing all addresses above. 816 * (Or can we just delay calling nd6_purge until at this point?) 817 */ 818 nd6_purge(ifp); 819 820 /* remove route to link-local allnodes multicast (ff02::1) */ 821 bzero(&sin6, sizeof(sin6)); 822 sin6.sin6_len = sizeof(struct sockaddr_in6); 823 sin6.sin6_family = AF_INET6; 824 sin6.sin6_addr = in6addr_linklocal_allnodes; 825 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 826 /* XXX: should not fail */ 827 return; 828 /* XXX grab lock first to avoid LOR */ 829 if (rt_tables[AF_INET6] != NULL) { 830 RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET6]); 831 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 832 if (rt) { 833 if (rt->rt_ifp == ifp) 834 rtexpunge(rt); 835 RTFREE_LOCKED(rt); 836 } 837 RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET6]); 838 } 839 } 840 841 int 842 in6_get_tmpifid(ifp, retbuf, baseid, generate) 843 struct ifnet *ifp; 844 u_int8_t *retbuf; 845 const u_int8_t *baseid; 846 int generate; 847 { 848 u_int8_t nullbuf[8]; 849 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 850 851 bzero(nullbuf, sizeof(nullbuf)); 852 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 853 /* we've never created a random ID. Create a new one. */ 854 generate = 1; 855 } 856 857 if (generate) { 858 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 859 860 /* generate_tmp_ifid will update seedn and buf */ 861 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 862 ndi->randomid); 863 } 864 bcopy(ndi->randomid, retbuf, 8); 865 866 return (0); 867 } 868 869 void 870 in6_tmpaddrtimer(ignored_arg) 871 void *ignored_arg; 872 { 873 struct nd_ifinfo *ndi; 874 u_int8_t nullbuf[8]; 875 struct ifnet *ifp; 876 int s = splnet(); 877 878 callout_reset(&in6_tmpaddrtimer_ch, 879 (ip6_temp_preferred_lifetime - ip6_desync_factor - 880 ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 881 882 bzero(nullbuf, sizeof(nullbuf)); 883 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 884 ndi = ND_IFINFO(ifp); 885 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 886 /* 887 * We've been generating a random ID on this interface. 888 * Create a new one. 889 */ 890 (void)generate_tmp_ifid(ndi->randomseed0, 891 ndi->randomseed1, ndi->randomid); 892 } 893 } 894 895 splx(s); 896 }
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