in6_ifattach.c revision 193744
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 193744 2009-06-08 19:57:35Z bz $"); 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/jail.h> 41#include <sys/kernel.h> 42#include <sys/syslog.h> 43#include <sys/md5.h> 44#include <sys/vimage.h> 45 46#include <net/if.h> 47#include <net/if_dl.h> 48#include <net/if_types.h> 49#include <net/route.h> 50#include <net/vnet.h> 51 52#include <netinet/in.h> 53#include <netinet/in_var.h> 54#include <netinet/if_ether.h> 55#include <netinet/in_pcb.h> 56#include <netinet/vinet.h> 57 58#include <netinet/ip6.h> 59#include <netinet6/ip6_var.h> 60#include <netinet6/in6_var.h> 61#include <netinet6/in6_pcb.h> 62#include <netinet6/in6_ifattach.h> 63#include <netinet6/ip6_var.h> 64#include <netinet6/nd6.h> 65#include <netinet6/mld6_var.h> 66#include <netinet6/scope6_var.h> 67#include <netinet6/vinet6.h> 68 69#ifdef VIMAGE_GLOBALS 70unsigned long in6_maxmtu; 71int ip6_auto_linklocal; 72struct callout in6_tmpaddrtimer_ch; 73extern struct inpcbinfo ripcbinfo; 74#endif 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 struct prison *pr; 108 u_int8_t digest[16]; 109 int hostnamelen; 110 111 pr = curthread->td_ucred->cr_prison; 112 mtx_lock(&pr->pr_mtx); 113 hostnamelen = strlen(pr->pr_host); 114#if 0 115 /* we need at least several letters as seed for ifid */ 116 if (hostnamelen < 3) { 117 mtx_unlock(&pr->pr_mtx); 118 return -1; 119 } 120#endif 121 122 /* generate 8 bytes of pseudo-random value. */ 123 bzero(&ctxt, sizeof(ctxt)); 124 MD5Init(&ctxt); 125 MD5Update(&ctxt, pr->pr_host, hostnamelen); 126 mtx_unlock(&pr->pr_mtx); 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 142static int 143generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 144{ 145 INIT_VNET_INET6(curvnet); 146 MD5_CTX ctxt; 147 u_int8_t seed[16], digest[16], nullbuf[8]; 148 u_int32_t val32; 149 150 /* If there's no history, start with a random seed. */ 151 bzero(nullbuf, sizeof(nullbuf)); 152 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 153 int i; 154 155 for (i = 0; i < 2; i++) { 156 val32 = arc4random(); 157 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 158 } 159 } else 160 bcopy(seed0, seed, 8); 161 162 /* copy the right-most 64-bits of the given address */ 163 /* XXX assumption on the size of IFID */ 164 bcopy(seed1, &seed[8], 8); 165 166 if (0) { /* for debugging purposes only */ 167 int i; 168 169 printf("generate_tmp_ifid: new randomized ID from: "); 170 for (i = 0; i < 16; i++) 171 printf("%02x", seed[i]); 172 printf(" "); 173 } 174 175 /* generate 16 bytes of pseudo-random value. */ 176 bzero(&ctxt, sizeof(ctxt)); 177 MD5Init(&ctxt); 178 MD5Update(&ctxt, seed, sizeof(seed)); 179 MD5Final(digest, &ctxt); 180 181 /* 182 * RFC 3041 3.2.1. (3) 183 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 184 * left-most bit is numbered 0) to zero. 185 */ 186 bcopy(digest, ret, 8); 187 ret[0] &= ~EUI64_UBIT; 188 189 /* 190 * XXX: we'd like to ensure that the generated value is not zero 191 * for simplicity. If the caclculated digest happens to be zero, 192 * use a random non-zero value as the last resort. 193 */ 194 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 195 nd6log((LOG_INFO, 196 "generate_tmp_ifid: computed MD5 value is zero.\n")); 197 198 val32 = arc4random(); 199 val32 = 1 + (val32 % (0xffffffff - 1)); 200 } 201 202 /* 203 * RFC 3041 3.2.1. (4) 204 * Take the rightmost 64-bits of the MD5 digest and save them in 205 * stable storage as the history value to be used in the next 206 * iteration of the algorithm. 207 */ 208 bcopy(&digest[8], seed0, 8); 209 210 if (0) { /* for debugging purposes only */ 211 int i; 212 213 printf("to: "); 214 for (i = 0; i < 16; i++) 215 printf("%02x", digest[i]); 216 printf("\n"); 217 } 218 219 return 0; 220} 221 222/* 223 * Get interface identifier for the specified interface. 224 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 225 * 226 * in6 - upper 64bits are preserved 227 */ 228int 229in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 230{ 231 struct ifaddr *ifa; 232 struct sockaddr_dl *sdl; 233 u_int8_t *addr; 234 size_t addrlen; 235 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 236 static u_int8_t allone[8] = 237 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 238 239 IF_ADDR_LOCK(ifp); 240 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 241 if (ifa->ifa_addr->sa_family != AF_LINK) 242 continue; 243 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 244 if (sdl == NULL) 245 continue; 246 if (sdl->sdl_alen == 0) 247 continue; 248 249 goto found; 250 } 251 IF_ADDR_UNLOCK(ifp); 252 253 return -1; 254 255found: 256 addr = LLADDR(sdl); 257 addrlen = sdl->sdl_alen; 258 259 /* get EUI64 */ 260 switch (ifp->if_type) { 261 case IFT_ETHER: 262 case IFT_FDDI: 263 case IFT_ISO88025: 264 case IFT_ATM: 265 case IFT_IEEE1394: 266#ifdef IFT_IEEE80211 267 case IFT_IEEE80211: 268#endif 269 /* IEEE802/EUI64 cases - what others? */ 270 /* IEEE1394 uses 16byte length address starting with EUI64 */ 271 if (addrlen > 8) 272 addrlen = 8; 273 274 /* look at IEEE802/EUI64 only */ 275 if (addrlen != 8 && addrlen != 6) { 276 IF_ADDR_UNLOCK(ifp); 277 return -1; 278 } 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 IF_ADDR_UNLOCK(ifp); 287 return -1; 288 } 289 if (bcmp(addr, allone, addrlen) == 0) { 290 IF_ADDR_UNLOCK(ifp); 291 return -1; 292 } 293 294 /* make EUI64 address */ 295 if (addrlen == 8) 296 bcopy(addr, &in6->s6_addr[8], 8); 297 else if (addrlen == 6) { 298 in6->s6_addr[8] = addr[0]; 299 in6->s6_addr[9] = addr[1]; 300 in6->s6_addr[10] = addr[2]; 301 in6->s6_addr[11] = 0xff; 302 in6->s6_addr[12] = 0xfe; 303 in6->s6_addr[13] = addr[3]; 304 in6->s6_addr[14] = addr[4]; 305 in6->s6_addr[15] = addr[5]; 306 } 307 break; 308 309 case IFT_ARCNET: 310 if (addrlen != 1) { 311 IF_ADDR_UNLOCK(ifp); 312 return -1; 313 } 314 if (!addr[0]) { 315 IF_ADDR_UNLOCK(ifp); 316 return -1; 317 } 318 319 bzero(&in6->s6_addr[8], 8); 320 in6->s6_addr[15] = addr[0]; 321 322 /* 323 * due to insufficient bitwidth, we mark it local. 324 */ 325 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 326 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 327 break; 328 329 case IFT_GIF: 330#ifdef IFT_STF 331 case IFT_STF: 332#endif 333 /* 334 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 335 * however, IPv4 address is not very suitable as unique 336 * identifier source (can be renumbered). 337 * we don't do this. 338 */ 339 IF_ADDR_UNLOCK(ifp); 340 return -1; 341 342 default: 343 IF_ADDR_UNLOCK(ifp); 344 return -1; 345 } 346 347 /* sanity check: g bit must not indicate "group" */ 348 if (EUI64_GROUP(in6)) { 349 IF_ADDR_UNLOCK(ifp); 350 return -1; 351 } 352 353 /* convert EUI64 into IPv6 interface identifier */ 354 EUI64_TO_IFID(in6); 355 356 /* 357 * sanity check: ifid must not be all zero, avoid conflict with 358 * subnet router anycast 359 */ 360 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 361 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 362 IF_ADDR_UNLOCK(ifp); 363 return -1; 364 } 365 366 IF_ADDR_UNLOCK(ifp); 367 return 0; 368} 369 370/* 371 * Get interface identifier for the specified interface. If it is not 372 * available on ifp0, borrow interface identifier from other information 373 * sources. 374 * 375 * altifp - secondary EUI64 source 376 */ 377static int 378get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 379 struct in6_addr *in6) 380{ 381 INIT_VNET_NET(ifp0->if_vnet); 382 INIT_VNET_INET6(ifp0->if_vnet); 383 struct ifnet *ifp; 384 385 /* first, try to get it from the interface itself */ 386 if (in6_get_hw_ifid(ifp0, in6) == 0) { 387 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 388 if_name(ifp0))); 389 goto success; 390 } 391 392 /* try secondary EUI64 source. this basically is for ATM PVC */ 393 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 394 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 395 if_name(ifp0), if_name(altifp))); 396 goto success; 397 } 398 399 /* next, try to get it from some other hardware interface */ 400 IFNET_RLOCK(); 401 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 402 if (ifp == ifp0) 403 continue; 404 if (in6_get_hw_ifid(ifp, in6) != 0) 405 continue; 406 407 /* 408 * to borrow ifid from other interface, ifid needs to be 409 * globally unique 410 */ 411 if (IFID_UNIVERSAL(in6)) { 412 nd6log((LOG_DEBUG, 413 "%s: borrow interface identifier from %s\n", 414 if_name(ifp0), if_name(ifp))); 415 IFNET_RUNLOCK(); 416 goto success; 417 } 418 } 419 IFNET_RUNLOCK(); 420 421 /* last resort: get from random number source */ 422 if (get_rand_ifid(ifp, in6) == 0) { 423 nd6log((LOG_DEBUG, 424 "%s: interface identifier generated by random number\n", 425 if_name(ifp0))); 426 goto success; 427 } 428 429 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 430 return -1; 431 432success: 433 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 434 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 435 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 436 in6->s6_addr[14], in6->s6_addr[15])); 437 return 0; 438} 439 440/* 441 * altifp - secondary EUI64 source 442 */ 443static int 444in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 445{ 446 INIT_VNET_INET6(curvnet); 447 struct in6_ifaddr *ia; 448 struct in6_aliasreq ifra; 449 struct nd_prefixctl pr0; 450 int i, error; 451 452 /* 453 * configure link-local address. 454 */ 455 bzero(&ifra, sizeof(ifra)); 456 457 /* 458 * in6_update_ifa() does not use ifra_name, but we accurately set it 459 * for safety. 460 */ 461 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 462 463 ifra.ifra_addr.sin6_family = AF_INET6; 464 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 465 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 466 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 467 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 468 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 469 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 470 } else { 471 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 472 nd6log((LOG_ERR, 473 "%s: no ifid available\n", if_name(ifp))); 474 return (-1); 475 } 476 } 477 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 478 return (-1); 479 480 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 481 ifra.ifra_prefixmask.sin6_family = AF_INET6; 482 ifra.ifra_prefixmask.sin6_addr = in6mask64; 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 * Now call in6_update_ifa() to do a bunch of procedures to configure 489 * a link-local address. We can set the 3rd argument to NULL, because 490 * we know there's no other link-local address on the interface 491 * and therefore we are adding one (instead of updating one). 492 */ 493 if ((error = in6_update_ifa(ifp, &ifra, NULL, 494 IN6_IFAUPDATE_DADDELAY)) != 0) { 495 /* 496 * XXX: When the interface does not support IPv6, this call 497 * would fail in the SIOCSIFADDR ioctl. I believe the 498 * notification is rather confusing in this case, so just 499 * suppress it. (jinmei@kame.net 20010130) 500 */ 501 if (error != EAFNOSUPPORT) 502 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 503 "configure a link-local address on %s " 504 "(errno=%d)\n", 505 if_name(ifp), error)); 506 return (-1); 507 } 508 509 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 510#ifdef DIAGNOSTIC 511 if (!ia) { 512 panic("ia == NULL in in6_ifattach_linklocal"); 513 /* NOTREACHED */ 514 } 515#endif 516 517 /* 518 * Make the link-local prefix (fe80::%link/64) as on-link. 519 * Since we'd like to manage prefixes separately from addresses, 520 * we make an ND6 prefix structure for the link-local prefix, 521 * and add it to the prefix list as a never-expire prefix. 522 * XXX: this change might affect some existing code base... 523 */ 524 bzero(&pr0, sizeof(pr0)); 525 pr0.ndpr_ifp = ifp; 526 /* this should be 64 at this moment. */ 527 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 528 pr0.ndpr_prefix = ifra.ifra_addr; 529 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 530 for (i = 0; i < 4; i++) { 531 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 532 in6mask64.s6_addr32[i]; 533 } 534 /* 535 * Initialize parameters. The link-local prefix must always be 536 * on-link, and its lifetimes never expire. 537 */ 538 pr0.ndpr_raf_onlink = 1; 539 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 540 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 541 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 542 /* 543 * Since there is no other link-local addresses, nd6_prefix_lookup() 544 * probably returns NULL. However, we cannot always expect the result. 545 * For example, if we first remove the (only) existing link-local 546 * address, and then reconfigure another one, the prefix is still 547 * valid with referring to the old link-local address. 548 */ 549 if (nd6_prefix_lookup(&pr0) == NULL) { 550 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 551 return (error); 552 } 553 554 return 0; 555} 556 557/* 558 * ifp - must be IFT_LOOP 559 */ 560static int 561in6_ifattach_loopback(struct ifnet *ifp) 562{ 563 INIT_VNET_INET6(curvnet); 564 struct in6_aliasreq ifra; 565 int error; 566 567 bzero(&ifra, sizeof(ifra)); 568 569 /* 570 * in6_update_ifa() does not use ifra_name, but we accurately set it 571 * for safety. 572 */ 573 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 574 575 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 576 ifra.ifra_prefixmask.sin6_family = AF_INET6; 577 ifra.ifra_prefixmask.sin6_addr = in6mask128; 578 579 /* 580 * Always initialize ia_dstaddr (= broadcast address) to loopback 581 * address. Follows IPv4 practice - see in_ifinit(). 582 */ 583 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 584 ifra.ifra_dstaddr.sin6_family = AF_INET6; 585 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 586 587 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 588 ifra.ifra_addr.sin6_family = AF_INET6; 589 ifra.ifra_addr.sin6_addr = in6addr_loopback; 590 591 /* the loopback address should NEVER expire. */ 592 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 593 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 594 595 /* we don't need to perform DAD on loopback interfaces. */ 596 ifra.ifra_flags |= IN6_IFF_NODAD; 597 598 /* skip registration to the prefix list. XXX should be temporary. */ 599 ifra.ifra_flags |= IN6_IFF_NOPFX; 600 601 /* 602 * We are sure that this is a newly assigned address, so we can set 603 * NULL to the 3rd arg. 604 */ 605 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 606 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 607 "the loopback address on %s (errno=%d)\n", 608 if_name(ifp), error)); 609 return (-1); 610 } 611 612 return 0; 613} 614 615/* 616 * compute NI group address, based on the current hostname setting. 617 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 618 * 619 * when ifp == NULL, the caller is responsible for filling scopeid. 620 */ 621int 622in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 623 struct in6_addr *in6) 624{ 625 struct prison *pr; 626 const char *p; 627 u_char *q; 628 MD5_CTX ctxt; 629 u_int8_t digest[16]; 630 char l; 631 char n[64]; /* a single label must not exceed 63 chars */ 632 633 /* 634 * If no name is given and namelen is -1, 635 * we try to do the hostname lookup ourselves. 636 */ 637 if (!name && namelen == -1) { 638 pr = curthread->td_ucred->cr_prison; 639 mtx_lock(&pr->pr_mtx); 640 name = pr->pr_host; 641 namelen = strlen(name); 642 } else 643 pr = NULL; 644 if (!name || !namelen) { 645 if (pr != NULL) 646 mtx_unlock(&pr->pr_mtx); 647 return -1; 648 } 649 650 p = name; 651 while (p && *p && *p != '.' && p - name < namelen) 652 p++; 653 if (p == name || p - name > sizeof(n) - 1) { 654 if (pr != NULL) 655 mtx_unlock(&pr->pr_mtx); 656 return -1; /* label too long */ 657 } 658 l = p - name; 659 strncpy(n, name, l); 660 if (pr != NULL) 661 mtx_unlock(&pr->pr_mtx); 662 n[(int)l] = '\0'; 663 for (q = n; *q; q++) { 664 if ('A' <= *q && *q <= 'Z') 665 *q = *q - 'A' + 'a'; 666 } 667 668 /* generate 8 bytes of pseudo-random value. */ 669 bzero(&ctxt, sizeof(ctxt)); 670 MD5Init(&ctxt); 671 MD5Update(&ctxt, &l, sizeof(l)); 672 MD5Update(&ctxt, n, l); 673 MD5Final(digest, &ctxt); 674 675 bzero(in6, sizeof(*in6)); 676 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 677 in6->s6_addr8[11] = 2; 678 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 679 if (in6_setscope(in6, ifp, NULL)) 680 return (-1); /* XXX: should not fail */ 681 682 return 0; 683} 684 685/* 686 * XXX multiple loopback interface needs more care. for instance, 687 * nodelocal address needs to be configured onto only one of them. 688 * XXX multiple link-local address case 689 * 690 * altifp - secondary EUI64 source 691 */ 692void 693in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 694{ 695 INIT_VNET_INET6(ifp->if_vnet); 696 struct in6_ifaddr *ia; 697 struct in6_addr in6; 698 699 /* some of the interfaces are inherently not IPv6 capable */ 700 switch (ifp->if_type) { 701 case IFT_PFLOG: 702 case IFT_PFSYNC: 703 case IFT_CARP: 704 return; 705 } 706 707 /* 708 * quirks based on interface type 709 */ 710 switch (ifp->if_type) { 711#ifdef IFT_STF 712 case IFT_STF: 713 /* 714 * 6to4 interface is a very special kind of beast. 715 * no multicast, no linklocal. RFC2529 specifies how to make 716 * linklocals for 6to4 interface, but there's no use and 717 * it is rather harmful to have one. 718 */ 719 goto statinit; 720#endif 721 default: 722 break; 723 } 724 725 /* 726 * usually, we require multicast capability to the interface 727 */ 728 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 729 nd6log((LOG_INFO, "in6_ifattach: " 730 "%s is not multicast capable, IPv6 not enabled\n", 731 if_name(ifp))); 732 return; 733 } 734 735 /* 736 * assign loopback address for loopback interface. 737 * XXX multiple loopback interface case. 738 */ 739 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 740 in6 = in6addr_loopback; 741 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 742 if (in6_ifattach_loopback(ifp) != 0) 743 return; 744 } 745 } 746 747 /* 748 * assign a link-local address, if there's none. 749 */ 750 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 751 ia = in6ifa_ifpforlinklocal(ifp, 0); 752 if (ia == NULL) { 753 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 754 /* linklocal address assigned */ 755 } else { 756 /* failed to assign linklocal address. bark? */ 757 } 758 } 759 } 760 761#ifdef IFT_STF /* XXX */ 762statinit: 763#endif 764 765 /* update dynamically. */ 766 if (V_in6_maxmtu < ifp->if_mtu) 767 V_in6_maxmtu = ifp->if_mtu; 768} 769 770/* 771 * NOTE: in6_ifdetach() does not support loopback if at this moment. 772 * We don't need this function in bsdi, because interfaces are never removed 773 * from the ifnet list in bsdi. 774 */ 775void 776in6_ifdetach(struct ifnet *ifp) 777{ 778 INIT_VNET_INET(ifp->if_vnet); 779 INIT_VNET_INET6(ifp->if_vnet); 780 struct in6_ifaddr *ia, *oia; 781 struct ifaddr *ifa, *next; 782 struct radix_node_head *rnh; 783 struct rtentry *rt; 784 short rtflags; 785 struct sockaddr_in6 sin6; 786 struct in6_multi_mship *imm; 787 788 /* remove neighbor management table */ 789 nd6_purge(ifp); 790 791 /* nuke any of IPv6 addresses we have */ 792 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 793 if (ifa->ifa_addr->sa_family != AF_INET6) 794 continue; 795 in6_purgeaddr(ifa); 796 } 797 798 /* undo everything done by in6_ifattach(), just in case */ 799 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 800 if (ifa->ifa_addr->sa_family != AF_INET6 801 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 802 continue; 803 } 804 805 ia = (struct in6_ifaddr *)ifa; 806 807 /* 808 * leave from multicast groups we have joined for the interface 809 */ 810 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 811 LIST_REMOVE(imm, i6mm_chain); 812 in6_leavegroup(imm); 813 } 814 815 /* remove from the routing table */ 816 if ((ia->ia_flags & IFA_ROUTE) && 817 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 818 rtflags = rt->rt_flags; 819 RTFREE_LOCKED(rt); 820 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 821 (struct sockaddr *)&ia->ia_addr, 822 (struct sockaddr *)&ia->ia_prefixmask, 823 rtflags, (struct rtentry **)0); 824 } 825 826 /* remove from the linked list */ 827 IF_ADDR_LOCK(ifp); 828 TAILQ_REMOVE(&ifp->if_addrhead, (struct ifaddr *)ia, ifa_link); 829 IF_ADDR_UNLOCK(ifp); 830 IFAFREE(&ia->ia_ifa); 831 832 /* also remove from the IPv6 address chain(itojun&jinmei) */ 833 oia = ia; 834 if (oia == (ia = V_in6_ifaddr)) 835 V_in6_ifaddr = ia->ia_next; 836 else { 837 while (ia->ia_next && (ia->ia_next != oia)) 838 ia = ia->ia_next; 839 if (ia->ia_next) 840 ia->ia_next = oia->ia_next; 841 else { 842 nd6log((LOG_ERR, 843 "%s: didn't unlink in6ifaddr from list\n", 844 if_name(ifp))); 845 } 846 } 847 848 IFAFREE(&oia->ia_ifa); 849 } 850 851 in6_pcbpurgeif0(&V_udbinfo, ifp); 852 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 853 /* leave from all multicast groups joined */ 854 in6_purgemaddrs(ifp); 855 856 /* 857 * remove neighbor management table. we call it twice just to make 858 * sure we nuke everything. maybe we need just one call. 859 * XXX: since the first call did not release addresses, some prefixes 860 * might remain. We should call nd6_purge() again to release the 861 * prefixes after removing all addresses above. 862 * (Or can we just delay calling nd6_purge until at this point?) 863 */ 864 nd6_purge(ifp); 865 866 /* remove route to link-local allnodes multicast (ff02::1) */ 867 bzero(&sin6, sizeof(sin6)); 868 sin6.sin6_len = sizeof(struct sockaddr_in6); 869 sin6.sin6_family = AF_INET6; 870 sin6.sin6_addr = in6addr_linklocal_allnodes; 871 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 872 /* XXX: should not fail */ 873 return; 874 /* XXX grab lock first to avoid LOR */ 875 rnh = rt_tables_get_rnh(0, AF_INET6); 876 if (rnh != NULL) { 877 RADIX_NODE_HEAD_LOCK(rnh); 878 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 879 if (rt) { 880 if (rt->rt_ifp == ifp) 881 rtexpunge(rt); 882 RTFREE_LOCKED(rt); 883 } 884 RADIX_NODE_HEAD_UNLOCK(rnh); 885 } 886} 887 888int 889in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 890 const u_int8_t *baseid, int generate) 891{ 892 u_int8_t nullbuf[8]; 893 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 894 895 bzero(nullbuf, sizeof(nullbuf)); 896 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 897 /* we've never created a random ID. Create a new one. */ 898 generate = 1; 899 } 900 901 if (generate) { 902 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 903 904 /* generate_tmp_ifid will update seedn and buf */ 905 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 906 ndi->randomid); 907 } 908 bcopy(ndi->randomid, retbuf, 8); 909 910 return (0); 911} 912 913void 914in6_tmpaddrtimer(void *arg) 915{ 916 CURVNET_SET((struct vnet *) arg); 917 INIT_VNET_NET(curvnet); 918 INIT_VNET_INET6(curvnet); 919 struct nd_ifinfo *ndi; 920 u_int8_t nullbuf[8]; 921 struct ifnet *ifp; 922 923 callout_reset(&V_in6_tmpaddrtimer_ch, 924 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 925 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 926 927 bzero(nullbuf, sizeof(nullbuf)); 928 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 929 ifp = TAILQ_NEXT(ifp, if_list)) { 930 ndi = ND_IFINFO(ifp); 931 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 932 /* 933 * We've been generating a random ID on this interface. 934 * Create a new one. 935 */ 936 (void)generate_tmp_ifid(ndi->randomseed0, 937 ndi->randomseed1, ndi->randomid); 938 } 939 } 940 941 CURVNET_RESTORE(); 942} 943 944static void 945in6_purgemaddrs(struct ifnet *ifp) 946{ 947 LIST_HEAD(,in6_multi) purgeinms; 948 struct in6_multi *inm, *tinm; 949 struct ifmultiaddr *ifma; 950 951 LIST_INIT(&purgeinms); 952 IN6_MULTI_LOCK(); 953 954 /* 955 * Extract list of in6_multi associated with the detaching ifp 956 * which the PF_INET6 layer is about to release. 957 * We need to do this as IF_ADDR_LOCK() may be re-acquired 958 * by code further down. 959 */ 960 IF_ADDR_LOCK(ifp); 961 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 962 if (ifma->ifma_addr->sa_family != AF_INET6 || 963 ifma->ifma_protospec == NULL) 964 continue; 965 inm = (struct in6_multi *)ifma->ifma_protospec; 966 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 967 } 968 IF_ADDR_UNLOCK(ifp); 969 970 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 971 LIST_REMOVE(inm, in6m_entry); 972 in6m_release_locked(inm); 973 } 974 mld_ifdetach(ifp); 975 976 IN6_MULTI_UNLOCK(); 977} 978