in6_ifattach.c revision 194907
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 194907 2009-06-24 21:00:25Z 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/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_hostname); 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_hostname, 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 IF_ADDR_LOCK_ASSERT(ifp); 257 addr = LLADDR(sdl); 258 addrlen = sdl->sdl_alen; 259 260 /* get EUI64 */ 261 switch (ifp->if_type) { 262 case IFT_ETHER: 263 case IFT_FDDI: 264 case IFT_ISO88025: 265 case IFT_ATM: 266 case IFT_IEEE1394: 267#ifdef IFT_IEEE80211 268 case IFT_IEEE80211: 269#endif 270 /* IEEE802/EUI64 cases - what others? */ 271 /* IEEE1394 uses 16byte length address starting with EUI64 */ 272 if (addrlen > 8) 273 addrlen = 8; 274 275 /* look at IEEE802/EUI64 only */ 276 if (addrlen != 8 && addrlen != 6) { 277 IF_ADDR_UNLOCK(ifp); 278 return -1; 279 } 280 281 /* 282 * check for invalid MAC address - on bsdi, we see it a lot 283 * since wildboar configures all-zero MAC on pccard before 284 * card insertion. 285 */ 286 if (bcmp(addr, allzero, addrlen) == 0) { 287 IF_ADDR_UNLOCK(ifp); 288 return -1; 289 } 290 if (bcmp(addr, allone, addrlen) == 0) { 291 IF_ADDR_UNLOCK(ifp); 292 return -1; 293 } 294 295 /* make EUI64 address */ 296 if (addrlen == 8) 297 bcopy(addr, &in6->s6_addr[8], 8); 298 else if (addrlen == 6) { 299 in6->s6_addr[8] = addr[0]; 300 in6->s6_addr[9] = addr[1]; 301 in6->s6_addr[10] = addr[2]; 302 in6->s6_addr[11] = 0xff; 303 in6->s6_addr[12] = 0xfe; 304 in6->s6_addr[13] = addr[3]; 305 in6->s6_addr[14] = addr[4]; 306 in6->s6_addr[15] = addr[5]; 307 } 308 break; 309 310 case IFT_ARCNET: 311 if (addrlen != 1) { 312 IF_ADDR_UNLOCK(ifp); 313 return -1; 314 } 315 if (!addr[0]) { 316 IF_ADDR_UNLOCK(ifp); 317 return -1; 318 } 319 320 bzero(&in6->s6_addr[8], 8); 321 in6->s6_addr[15] = addr[0]; 322 323 /* 324 * due to insufficient bitwidth, we mark it local. 325 */ 326 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 327 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 328 break; 329 330 case IFT_GIF: 331#ifdef IFT_STF 332 case IFT_STF: 333#endif 334 /* 335 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 336 * however, IPv4 address is not very suitable as unique 337 * identifier source (can be renumbered). 338 * we don't do this. 339 */ 340 IF_ADDR_UNLOCK(ifp); 341 return -1; 342 343 default: 344 IF_ADDR_UNLOCK(ifp); 345 return -1; 346 } 347 348 /* sanity check: g bit must not indicate "group" */ 349 if (EUI64_GROUP(in6)) { 350 IF_ADDR_UNLOCK(ifp); 351 return -1; 352 } 353 354 /* convert EUI64 into IPv6 interface identifier */ 355 EUI64_TO_IFID(in6); 356 357 /* 358 * sanity check: ifid must not be all zero, avoid conflict with 359 * subnet router anycast 360 */ 361 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 362 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 363 IF_ADDR_UNLOCK(ifp); 364 return -1; 365 } 366 367 IF_ADDR_UNLOCK(ifp); 368 return 0; 369} 370 371/* 372 * Get interface identifier for the specified interface. If it is not 373 * available on ifp0, borrow interface identifier from other information 374 * sources. 375 * 376 * altifp - secondary EUI64 source 377 */ 378static int 379get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 380 struct in6_addr *in6) 381{ 382 INIT_VNET_NET(ifp0->if_vnet); 383 INIT_VNET_INET6(ifp0->if_vnet); 384 struct ifnet *ifp; 385 386 /* first, try to get it from the interface itself */ 387 if (in6_get_hw_ifid(ifp0, in6) == 0) { 388 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 389 if_name(ifp0))); 390 goto success; 391 } 392 393 /* try secondary EUI64 source. this basically is for ATM PVC */ 394 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 395 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 396 if_name(ifp0), if_name(altifp))); 397 goto success; 398 } 399 400 /* next, try to get it from some other hardware interface */ 401 IFNET_RLOCK(); 402 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 403 if (ifp == ifp0) 404 continue; 405 if (in6_get_hw_ifid(ifp, in6) != 0) 406 continue; 407 408 /* 409 * to borrow ifid from other interface, ifid needs to be 410 * globally unique 411 */ 412 if (IFID_UNIVERSAL(in6)) { 413 nd6log((LOG_DEBUG, 414 "%s: borrow interface identifier from %s\n", 415 if_name(ifp0), if_name(ifp))); 416 IFNET_RUNLOCK(); 417 goto success; 418 } 419 } 420 IFNET_RUNLOCK(); 421 422 /* last resort: get from random number source */ 423 if (get_rand_ifid(ifp, in6) == 0) { 424 nd6log((LOG_DEBUG, 425 "%s: interface identifier generated by random number\n", 426 if_name(ifp0))); 427 goto success; 428 } 429 430 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 431 return -1; 432 433success: 434 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 435 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 436 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 437 in6->s6_addr[14], in6->s6_addr[15])); 438 return 0; 439} 440 441/* 442 * altifp - secondary EUI64 source 443 */ 444static int 445in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 446{ 447 INIT_VNET_INET6(curvnet); 448 struct in6_ifaddr *ia; 449 struct in6_aliasreq ifra; 450 struct nd_prefixctl pr0; 451 int i, error; 452 453 /* 454 * configure link-local address. 455 */ 456 bzero(&ifra, sizeof(ifra)); 457 458 /* 459 * in6_update_ifa() does not use ifra_name, but we accurately set it 460 * for safety. 461 */ 462 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 463 464 ifra.ifra_addr.sin6_family = AF_INET6; 465 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 466 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 467 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 468 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 469 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 470 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 471 } else { 472 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 473 nd6log((LOG_ERR, 474 "%s: no ifid available\n", if_name(ifp))); 475 return (-1); 476 } 477 } 478 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 479 return (-1); 480 481 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 482 ifra.ifra_prefixmask.sin6_family = AF_INET6; 483 ifra.ifra_prefixmask.sin6_addr = in6mask64; 484 /* link-local addresses should NEVER expire. */ 485 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 486 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 487 488 /* 489 * Now call in6_update_ifa() to do a bunch of procedures to configure 490 * a link-local address. We can set the 3rd argument to NULL, because 491 * we know there's no other link-local address on the interface 492 * and therefore we are adding one (instead of updating one). 493 */ 494 if ((error = in6_update_ifa(ifp, &ifra, NULL, 495 IN6_IFAUPDATE_DADDELAY)) != 0) { 496 /* 497 * XXX: When the interface does not support IPv6, this call 498 * would fail in the SIOCSIFADDR ioctl. I believe the 499 * notification is rather confusing in this case, so just 500 * suppress it. (jinmei@kame.net 20010130) 501 */ 502 if (error != EAFNOSUPPORT) 503 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 504 "configure a link-local address on %s " 505 "(errno=%d)\n", 506 if_name(ifp), error)); 507 return (-1); 508 } 509 510 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 511#ifdef DIAGNOSTIC 512 if (!ia) { 513 panic("ia == NULL in in6_ifattach_linklocal"); 514 /* NOTREACHED */ 515 } 516#endif 517 ifa_free(&ia->ia_ifa); 518 519 /* 520 * Make the link-local prefix (fe80::%link/64) as on-link. 521 * Since we'd like to manage prefixes separately from addresses, 522 * we make an ND6 prefix structure for the link-local prefix, 523 * and add it to the prefix list as a never-expire prefix. 524 * XXX: this change might affect some existing code base... 525 */ 526 bzero(&pr0, sizeof(pr0)); 527 pr0.ndpr_ifp = ifp; 528 /* this should be 64 at this moment. */ 529 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 530 pr0.ndpr_prefix = ifra.ifra_addr; 531 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 532 for (i = 0; i < 4; i++) { 533 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 534 in6mask64.s6_addr32[i]; 535 } 536 /* 537 * Initialize parameters. The link-local prefix must always be 538 * on-link, and its lifetimes never expire. 539 */ 540 pr0.ndpr_raf_onlink = 1; 541 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 542 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 543 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 544 /* 545 * Since there is no other link-local addresses, nd6_prefix_lookup() 546 * probably returns NULL. However, we cannot always expect the result. 547 * For example, if we first remove the (only) existing link-local 548 * address, and then reconfigure another one, the prefix is still 549 * valid with referring to the old link-local address. 550 */ 551 if (nd6_prefix_lookup(&pr0) == NULL) { 552 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 553 return (error); 554 } 555 556 return 0; 557} 558 559/* 560 * ifp - must be IFT_LOOP 561 */ 562static int 563in6_ifattach_loopback(struct ifnet *ifp) 564{ 565 INIT_VNET_INET6(curvnet); 566 struct in6_aliasreq ifra; 567 int error; 568 569 bzero(&ifra, sizeof(ifra)); 570 571 /* 572 * in6_update_ifa() does not use ifra_name, but we accurately set it 573 * for safety. 574 */ 575 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 576 577 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 578 ifra.ifra_prefixmask.sin6_family = AF_INET6; 579 ifra.ifra_prefixmask.sin6_addr = in6mask128; 580 581 /* 582 * Always initialize ia_dstaddr (= broadcast address) to loopback 583 * address. Follows IPv4 practice - see in_ifinit(). 584 */ 585 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 586 ifra.ifra_dstaddr.sin6_family = AF_INET6; 587 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 588 589 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 590 ifra.ifra_addr.sin6_family = AF_INET6; 591 ifra.ifra_addr.sin6_addr = in6addr_loopback; 592 593 /* the loopback address should NEVER expire. */ 594 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 595 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 596 597 /* we don't need to perform DAD on loopback interfaces. */ 598 ifra.ifra_flags |= IN6_IFF_NODAD; 599 600 /* skip registration to the prefix list. XXX should be temporary. */ 601 ifra.ifra_flags |= IN6_IFF_NOPFX; 602 603 /* 604 * We are sure that this is a newly assigned address, so we can set 605 * NULL to the 3rd arg. 606 */ 607 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 608 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 609 "the loopback address on %s (errno=%d)\n", 610 if_name(ifp), error)); 611 return (-1); 612 } 613 614 return 0; 615} 616 617/* 618 * compute NI group address, based on the current hostname setting. 619 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 620 * 621 * when ifp == NULL, the caller is responsible for filling scopeid. 622 */ 623int 624in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 625 struct in6_addr *in6) 626{ 627 struct prison *pr; 628 const char *p; 629 u_char *q; 630 MD5_CTX ctxt; 631 u_int8_t digest[16]; 632 char l; 633 char n[64]; /* a single label must not exceed 63 chars */ 634 635 /* 636 * If no name is given and namelen is -1, 637 * we try to do the hostname lookup ourselves. 638 */ 639 if (!name && namelen == -1) { 640 pr = curthread->td_ucred->cr_prison; 641 mtx_lock(&pr->pr_mtx); 642 name = pr->pr_hostname; 643 namelen = strlen(name); 644 } else 645 pr = NULL; 646 if (!name || !namelen) { 647 if (pr != NULL) 648 mtx_unlock(&pr->pr_mtx); 649 return -1; 650 } 651 652 p = name; 653 while (p && *p && *p != '.' && p - name < namelen) 654 p++; 655 if (p == name || p - name > sizeof(n) - 1) { 656 if (pr != NULL) 657 mtx_unlock(&pr->pr_mtx); 658 return -1; /* label too long */ 659 } 660 l = p - name; 661 strncpy(n, name, l); 662 if (pr != NULL) 663 mtx_unlock(&pr->pr_mtx); 664 n[(int)l] = '\0'; 665 for (q = n; *q; q++) { 666 if ('A' <= *q && *q <= 'Z') 667 *q = *q - 'A' + 'a'; 668 } 669 670 /* generate 8 bytes of pseudo-random value. */ 671 bzero(&ctxt, sizeof(ctxt)); 672 MD5Init(&ctxt); 673 MD5Update(&ctxt, &l, sizeof(l)); 674 MD5Update(&ctxt, n, l); 675 MD5Final(digest, &ctxt); 676 677 bzero(in6, sizeof(*in6)); 678 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 679 in6->s6_addr8[11] = 2; 680 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 681 if (in6_setscope(in6, ifp, NULL)) 682 return (-1); /* XXX: should not fail */ 683 684 return 0; 685} 686 687/* 688 * XXX multiple loopback interface needs more care. for instance, 689 * nodelocal address needs to be configured onto only one of them. 690 * XXX multiple link-local address case 691 * 692 * altifp - secondary EUI64 source 693 */ 694void 695in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 696{ 697 INIT_VNET_INET6(ifp->if_vnet); 698 struct in6_ifaddr *ia; 699 struct in6_addr in6; 700 701 /* some of the interfaces are inherently not IPv6 capable */ 702 switch (ifp->if_type) { 703 case IFT_PFLOG: 704 case IFT_PFSYNC: 705 case IFT_CARP: 706 return; 707 } 708 709 /* 710 * quirks based on interface type 711 */ 712 switch (ifp->if_type) { 713#ifdef IFT_STF 714 case IFT_STF: 715 /* 716 * 6to4 interface is a very special kind of beast. 717 * no multicast, no linklocal. RFC2529 specifies how to make 718 * linklocals for 6to4 interface, but there's no use and 719 * it is rather harmful to have one. 720 */ 721 goto statinit; 722#endif 723 default: 724 break; 725 } 726 727 /* 728 * usually, we require multicast capability to the interface 729 */ 730 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 731 nd6log((LOG_INFO, "in6_ifattach: " 732 "%s is not multicast capable, IPv6 not enabled\n", 733 if_name(ifp))); 734 return; 735 } 736 737 /* 738 * assign loopback address for loopback interface. 739 * XXX multiple loopback interface case. 740 */ 741 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 742 struct ifaddr *ifa; 743 744 in6 = in6addr_loopback; 745 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 746 if (ifa == NULL) { 747 if (in6_ifattach_loopback(ifp) != 0) 748 return; 749 } else 750 ifa_free(ifa); 751 } 752 753 /* 754 * assign a link-local address, if there's none. 755 */ 756 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 757 ia = in6ifa_ifpforlinklocal(ifp, 0); 758 if (ia == NULL) { 759 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 760 /* linklocal address assigned */ 761 } else { 762 /* failed to assign linklocal address. bark? */ 763 } 764 } else 765 ifa_free(&ia->ia_ifa); 766 } 767 768#ifdef IFT_STF /* XXX */ 769statinit: 770#endif 771 772 /* update dynamically. */ 773 if (V_in6_maxmtu < ifp->if_mtu) 774 V_in6_maxmtu = ifp->if_mtu; 775} 776 777/* 778 * NOTE: in6_ifdetach() does not support loopback if at this moment. 779 * We don't need this function in bsdi, because interfaces are never removed 780 * from the ifnet list in bsdi. 781 */ 782void 783in6_ifdetach(struct ifnet *ifp) 784{ 785 INIT_VNET_INET(ifp->if_vnet); 786 INIT_VNET_INET6(ifp->if_vnet); 787 struct in6_ifaddr *ia; 788 struct ifaddr *ifa, *next; 789 struct radix_node_head *rnh; 790 struct rtentry *rt; 791 short rtflags; 792 struct sockaddr_in6 sin6; 793 struct in6_multi_mship *imm; 794 795 /* remove neighbor management table */ 796 nd6_purge(ifp); 797 798 /* nuke any of IPv6 addresses we have */ 799 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 800 if (ifa->ifa_addr->sa_family != AF_INET6) 801 continue; 802 in6_purgeaddr(ifa); 803 } 804 805 /* undo everything done by in6_ifattach(), just in case */ 806 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 807 if (ifa->ifa_addr->sa_family != AF_INET6 808 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 809 continue; 810 } 811 812 ia = (struct in6_ifaddr *)ifa; 813 814 /* 815 * leave from multicast groups we have joined for the interface 816 */ 817 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 818 LIST_REMOVE(imm, i6mm_chain); 819 in6_leavegroup(imm); 820 } 821 822 /* remove from the routing table */ 823 if ((ia->ia_flags & IFA_ROUTE) && 824 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 825 rtflags = rt->rt_flags; 826 RTFREE_LOCKED(rt); 827 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 828 (struct sockaddr *)&ia->ia_addr, 829 (struct sockaddr *)&ia->ia_prefixmask, 830 rtflags, (struct rtentry **)0); 831 } 832 833 /* remove from the linked list */ 834 IF_ADDR_LOCK(ifp); 835 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 836 IF_ADDR_UNLOCK(ifp); 837 ifa_free(ifa); /* if_addrhead */ 838 839 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 840 ifa_free(ifa); 841 } 842 843 in6_pcbpurgeif0(&V_udbinfo, ifp); 844 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 845 /* leave from all multicast groups joined */ 846 in6_purgemaddrs(ifp); 847 848 /* 849 * remove neighbor management table. we call it twice just to make 850 * sure we nuke everything. maybe we need just one call. 851 * XXX: since the first call did not release addresses, some prefixes 852 * might remain. We should call nd6_purge() again to release the 853 * prefixes after removing all addresses above. 854 * (Or can we just delay calling nd6_purge until at this point?) 855 */ 856 nd6_purge(ifp); 857 858 /* remove route to link-local allnodes multicast (ff02::1) */ 859 bzero(&sin6, sizeof(sin6)); 860 sin6.sin6_len = sizeof(struct sockaddr_in6); 861 sin6.sin6_family = AF_INET6; 862 sin6.sin6_addr = in6addr_linklocal_allnodes; 863 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 864 /* XXX: should not fail */ 865 return; 866 /* XXX grab lock first to avoid LOR */ 867 rnh = rt_tables_get_rnh(0, AF_INET6); 868 if (rnh != NULL) { 869 RADIX_NODE_HEAD_LOCK(rnh); 870 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 871 if (rt) { 872 if (rt->rt_ifp == ifp) 873 rtexpunge(rt); 874 RTFREE_LOCKED(rt); 875 } 876 RADIX_NODE_HEAD_UNLOCK(rnh); 877 } 878} 879 880int 881in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 882 const u_int8_t *baseid, int generate) 883{ 884 u_int8_t nullbuf[8]; 885 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 886 887 bzero(nullbuf, sizeof(nullbuf)); 888 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 889 /* we've never created a random ID. Create a new one. */ 890 generate = 1; 891 } 892 893 if (generate) { 894 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 895 896 /* generate_tmp_ifid will update seedn and buf */ 897 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 898 ndi->randomid); 899 } 900 bcopy(ndi->randomid, retbuf, 8); 901 902 return (0); 903} 904 905void 906in6_tmpaddrtimer(void *arg) 907{ 908 CURVNET_SET((struct vnet *) arg); 909 INIT_VNET_NET(curvnet); 910 INIT_VNET_INET6(curvnet); 911 struct nd_ifinfo *ndi; 912 u_int8_t nullbuf[8]; 913 struct ifnet *ifp; 914 915 callout_reset(&V_in6_tmpaddrtimer_ch, 916 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 917 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 918 919 bzero(nullbuf, sizeof(nullbuf)); 920 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 921 ifp = TAILQ_NEXT(ifp, if_list)) { 922 ndi = ND_IFINFO(ifp); 923 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 924 /* 925 * We've been generating a random ID on this interface. 926 * Create a new one. 927 */ 928 (void)generate_tmp_ifid(ndi->randomseed0, 929 ndi->randomseed1, ndi->randomid); 930 } 931 } 932 933 CURVNET_RESTORE(); 934} 935 936static void 937in6_purgemaddrs(struct ifnet *ifp) 938{ 939 LIST_HEAD(,in6_multi) purgeinms; 940 struct in6_multi *inm, *tinm; 941 struct ifmultiaddr *ifma; 942 943 LIST_INIT(&purgeinms); 944 IN6_MULTI_LOCK(); 945 946 /* 947 * Extract list of in6_multi associated with the detaching ifp 948 * which the PF_INET6 layer is about to release. 949 * We need to do this as IF_ADDR_LOCK() may be re-acquired 950 * by code further down. 951 */ 952 IF_ADDR_LOCK(ifp); 953 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 954 if (ifma->ifma_addr->sa_family != AF_INET6 || 955 ifma->ifma_protospec == NULL) 956 continue; 957 inm = (struct in6_multi *)ifma->ifma_protospec; 958 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 959 } 960 IF_ADDR_UNLOCK(ifp); 961 962 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 963 LIST_REMOVE(inm, in6m_entry); 964 in6m_release_locked(inm); 965 } 966 mld_ifdetach(ifp); 967 968 IN6_MULTI_UNLOCK(); 969} 970