in6_ifattach.c revision 207369
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 207369 2010-04-29 11:52:42Z 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/proc.h> 43#include <sys/syslog.h> 44#include <sys/md5.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/ip_var.h> 57#include <netinet/udp.h> 58#include <netinet/udp_var.h> 59 60#include <netinet/ip6.h> 61#include <netinet6/ip6_var.h> 62#include <netinet6/in6_var.h> 63#include <netinet6/in6_pcb.h> 64#include <netinet6/in6_ifattach.h> 65#include <netinet6/ip6_var.h> 66#include <netinet6/nd6.h> 67#include <netinet6/mld6_var.h> 68#include <netinet6/scope6_var.h> 69 70VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 71 72#ifdef IP6_AUTO_LINKLOCAL 73VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 74#else 75VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 76#endif 77 78VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 79#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 80 81VNET_DECLARE(struct inpcbinfo, ripcbinfo); 82#define V_ripcbinfo VNET(ripcbinfo) 83 84static int get_rand_ifid(struct ifnet *, struct in6_addr *); 85static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 86static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 87static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 88static int in6_ifattach_loopback(struct ifnet *); 89static void in6_purgemaddrs(struct ifnet *); 90 91#define EUI64_GBIT 0x01 92#define EUI64_UBIT 0x02 93#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 94#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 95#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 96#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 97#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 98 99#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 100#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 101 102/* 103 * Generate a last-resort interface identifier, when the machine has no 104 * IEEE802/EUI64 address sources. 105 * The goal here is to get an interface identifier that is 106 * (1) random enough and (2) does not change across reboot. 107 * We currently use MD5(hostname) for it. 108 * 109 * in6 - upper 64bits are preserved 110 */ 111static int 112get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 113{ 114 MD5_CTX ctxt; 115 struct prison *pr; 116 u_int8_t digest[16]; 117 int hostnamelen; 118 119 pr = curthread->td_ucred->cr_prison; 120 mtx_lock(&pr->pr_mtx); 121 hostnamelen = strlen(pr->pr_hostname); 122#if 0 123 /* we need at least several letters as seed for ifid */ 124 if (hostnamelen < 3) { 125 mtx_unlock(&pr->pr_mtx); 126 return -1; 127 } 128#endif 129 130 /* generate 8 bytes of pseudo-random value. */ 131 bzero(&ctxt, sizeof(ctxt)); 132 MD5Init(&ctxt); 133 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 134 mtx_unlock(&pr->pr_mtx); 135 MD5Final(digest, &ctxt); 136 137 /* assumes sizeof(digest) > sizeof(ifid) */ 138 bcopy(digest, &in6->s6_addr[8], 8); 139 140 /* make sure to set "u" bit to local, and "g" bit to individual. */ 141 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 142 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 143 144 /* convert EUI64 into IPv6 interface identifier */ 145 EUI64_TO_IFID(in6); 146 147 return 0; 148} 149 150static int 151generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 152{ 153 MD5_CTX ctxt; 154 u_int8_t seed[16], digest[16], nullbuf[8]; 155 u_int32_t val32; 156 157 /* If there's no history, start with a random seed. */ 158 bzero(nullbuf, sizeof(nullbuf)); 159 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 160 int i; 161 162 for (i = 0; i < 2; i++) { 163 val32 = arc4random(); 164 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 165 } 166 } else 167 bcopy(seed0, seed, 8); 168 169 /* copy the right-most 64-bits of the given address */ 170 /* XXX assumption on the size of IFID */ 171 bcopy(seed1, &seed[8], 8); 172 173 if (0) { /* for debugging purposes only */ 174 int i; 175 176 printf("generate_tmp_ifid: new randomized ID from: "); 177 for (i = 0; i < 16; i++) 178 printf("%02x", seed[i]); 179 printf(" "); 180 } 181 182 /* generate 16 bytes of pseudo-random value. */ 183 bzero(&ctxt, sizeof(ctxt)); 184 MD5Init(&ctxt); 185 MD5Update(&ctxt, seed, sizeof(seed)); 186 MD5Final(digest, &ctxt); 187 188 /* 189 * RFC 3041 3.2.1. (3) 190 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 191 * left-most bit is numbered 0) to zero. 192 */ 193 bcopy(digest, ret, 8); 194 ret[0] &= ~EUI64_UBIT; 195 196 /* 197 * XXX: we'd like to ensure that the generated value is not zero 198 * for simplicity. If the caclculated digest happens to be zero, 199 * use a random non-zero value as the last resort. 200 */ 201 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 202 nd6log((LOG_INFO, 203 "generate_tmp_ifid: computed MD5 value is zero.\n")); 204 205 val32 = arc4random(); 206 val32 = 1 + (val32 % (0xffffffff - 1)); 207 } 208 209 /* 210 * RFC 3041 3.2.1. (4) 211 * Take the rightmost 64-bits of the MD5 digest and save them in 212 * stable storage as the history value to be used in the next 213 * iteration of the algorithm. 214 */ 215 bcopy(&digest[8], seed0, 8); 216 217 if (0) { /* for debugging purposes only */ 218 int i; 219 220 printf("to: "); 221 for (i = 0; i < 16; i++) 222 printf("%02x", digest[i]); 223 printf("\n"); 224 } 225 226 return 0; 227} 228 229/* 230 * Get interface identifier for the specified interface. 231 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 232 * 233 * in6 - upper 64bits are preserved 234 */ 235int 236in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 237{ 238 struct ifaddr *ifa; 239 struct sockaddr_dl *sdl; 240 u_int8_t *addr; 241 size_t addrlen; 242 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 243 static u_int8_t allone[8] = 244 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 245 246 IF_ADDR_LOCK(ifp); 247 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 248 if (ifa->ifa_addr->sa_family != AF_LINK) 249 continue; 250 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 251 if (sdl == NULL) 252 continue; 253 if (sdl->sdl_alen == 0) 254 continue; 255 256 goto found; 257 } 258 IF_ADDR_UNLOCK(ifp); 259 260 return -1; 261 262found: 263 IF_ADDR_LOCK_ASSERT(ifp); 264 addr = LLADDR(sdl); 265 addrlen = sdl->sdl_alen; 266 267 /* get EUI64 */ 268 switch (ifp->if_type) { 269 case IFT_ETHER: 270 case IFT_FDDI: 271 case IFT_ISO88025: 272 case IFT_ATM: 273 case IFT_IEEE1394: 274#ifdef IFT_IEEE80211 275 case IFT_IEEE80211: 276#endif 277 /* IEEE802/EUI64 cases - what others? */ 278 /* IEEE1394 uses 16byte length address starting with EUI64 */ 279 if (addrlen > 8) 280 addrlen = 8; 281 282 /* look at IEEE802/EUI64 only */ 283 if (addrlen != 8 && addrlen != 6) { 284 IF_ADDR_UNLOCK(ifp); 285 return -1; 286 } 287 288 /* 289 * check for invalid MAC address - on bsdi, we see it a lot 290 * since wildboar configures all-zero MAC on pccard before 291 * card insertion. 292 */ 293 if (bcmp(addr, allzero, addrlen) == 0) { 294 IF_ADDR_UNLOCK(ifp); 295 return -1; 296 } 297 if (bcmp(addr, allone, addrlen) == 0) { 298 IF_ADDR_UNLOCK(ifp); 299 return -1; 300 } 301 302 /* make EUI64 address */ 303 if (addrlen == 8) 304 bcopy(addr, &in6->s6_addr[8], 8); 305 else if (addrlen == 6) { 306 in6->s6_addr[8] = addr[0]; 307 in6->s6_addr[9] = addr[1]; 308 in6->s6_addr[10] = addr[2]; 309 in6->s6_addr[11] = 0xff; 310 in6->s6_addr[12] = 0xfe; 311 in6->s6_addr[13] = addr[3]; 312 in6->s6_addr[14] = addr[4]; 313 in6->s6_addr[15] = addr[5]; 314 } 315 break; 316 317 case IFT_ARCNET: 318 if (addrlen != 1) { 319 IF_ADDR_UNLOCK(ifp); 320 return -1; 321 } 322 if (!addr[0]) { 323 IF_ADDR_UNLOCK(ifp); 324 return -1; 325 } 326 327 bzero(&in6->s6_addr[8], 8); 328 in6->s6_addr[15] = addr[0]; 329 330 /* 331 * due to insufficient bitwidth, we mark it local. 332 */ 333 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 334 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 335 break; 336 337 case IFT_GIF: 338#ifdef IFT_STF 339 case IFT_STF: 340#endif 341 /* 342 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 343 * however, IPv4 address is not very suitable as unique 344 * identifier source (can be renumbered). 345 * we don't do this. 346 */ 347 IF_ADDR_UNLOCK(ifp); 348 return -1; 349 350 default: 351 IF_ADDR_UNLOCK(ifp); 352 return -1; 353 } 354 355 /* sanity check: g bit must not indicate "group" */ 356 if (EUI64_GROUP(in6)) { 357 IF_ADDR_UNLOCK(ifp); 358 return -1; 359 } 360 361 /* convert EUI64 into IPv6 interface identifier */ 362 EUI64_TO_IFID(in6); 363 364 /* 365 * sanity check: ifid must not be all zero, avoid conflict with 366 * subnet router anycast 367 */ 368 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 369 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 370 IF_ADDR_UNLOCK(ifp); 371 return -1; 372 } 373 374 IF_ADDR_UNLOCK(ifp); 375 return 0; 376} 377 378/* 379 * Get interface identifier for the specified interface. If it is not 380 * available on ifp0, borrow interface identifier from other information 381 * sources. 382 * 383 * altifp - secondary EUI64 source 384 */ 385static int 386get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 387 struct in6_addr *in6) 388{ 389 struct ifnet *ifp; 390 391 /* first, try to get it from the interface itself */ 392 if (in6_get_hw_ifid(ifp0, in6) == 0) { 393 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 394 if_name(ifp0))); 395 goto success; 396 } 397 398 /* try secondary EUI64 source. this basically is for ATM PVC */ 399 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 400 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 401 if_name(ifp0), if_name(altifp))); 402 goto success; 403 } 404 405 /* next, try to get it from some other hardware interface */ 406 IFNET_RLOCK_NOSLEEP(); 407 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 408 if (ifp == ifp0) 409 continue; 410 if (in6_get_hw_ifid(ifp, in6) != 0) 411 continue; 412 413 /* 414 * to borrow ifid from other interface, ifid needs to be 415 * globally unique 416 */ 417 if (IFID_UNIVERSAL(in6)) { 418 nd6log((LOG_DEBUG, 419 "%s: borrow interface identifier from %s\n", 420 if_name(ifp0), if_name(ifp))); 421 IFNET_RUNLOCK_NOSLEEP(); 422 goto success; 423 } 424 } 425 IFNET_RUNLOCK_NOSLEEP(); 426 427 /* last resort: get from random number source */ 428 if (get_rand_ifid(ifp, in6) == 0) { 429 nd6log((LOG_DEBUG, 430 "%s: interface identifier generated by random number\n", 431 if_name(ifp0))); 432 goto success; 433 } 434 435 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 436 return -1; 437 438success: 439 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 440 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 441 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 442 in6->s6_addr[14], in6->s6_addr[15])); 443 return 0; 444} 445 446/* 447 * altifp - secondary EUI64 source 448 */ 449static int 450in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 451{ 452 struct in6_ifaddr *ia; 453 struct in6_aliasreq ifra; 454 struct nd_prefixctl pr0; 455 int i, error; 456 457 /* 458 * configure link-local address. 459 */ 460 bzero(&ifra, sizeof(ifra)); 461 462 /* 463 * in6_update_ifa() does not use ifra_name, but we accurately set it 464 * for safety. 465 */ 466 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 467 468 ifra.ifra_addr.sin6_family = AF_INET6; 469 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 470 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 471 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 472 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 473 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 474 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 475 } else { 476 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 477 nd6log((LOG_ERR, 478 "%s: no ifid available\n", if_name(ifp))); 479 return (-1); 480 } 481 } 482 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 483 return (-1); 484 485 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 486 ifra.ifra_prefixmask.sin6_family = AF_INET6; 487 ifra.ifra_prefixmask.sin6_addr = in6mask64; 488 /* link-local addresses should NEVER expire. */ 489 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 490 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 491 492 /* 493 * Now call in6_update_ifa() to do a bunch of procedures to configure 494 * a link-local address. We can set the 3rd argument to NULL, because 495 * we know there's no other link-local address on the interface 496 * and therefore we are adding one (instead of updating one). 497 */ 498 if ((error = in6_update_ifa(ifp, &ifra, NULL, 499 IN6_IFAUPDATE_DADDELAY)) != 0) { 500 /* 501 * XXX: When the interface does not support IPv6, this call 502 * would fail in the SIOCSIFADDR ioctl. I believe the 503 * notification is rather confusing in this case, so just 504 * suppress it. (jinmei@kame.net 20010130) 505 */ 506 if (error != EAFNOSUPPORT) 507 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 508 "configure a link-local address on %s " 509 "(errno=%d)\n", 510 if_name(ifp), error)); 511 return (-1); 512 } 513 514 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 515#ifdef DIAGNOSTIC 516 if (!ia) { 517 panic("ia == NULL in in6_ifattach_linklocal"); 518 /* NOTREACHED */ 519 } 520#endif 521 ifa_free(&ia->ia_ifa); 522 523 /* 524 * Make the link-local prefix (fe80::%link/64) as on-link. 525 * Since we'd like to manage prefixes separately from addresses, 526 * we make an ND6 prefix structure for the link-local prefix, 527 * and add it to the prefix list as a never-expire prefix. 528 * XXX: this change might affect some existing code base... 529 */ 530 bzero(&pr0, sizeof(pr0)); 531 pr0.ndpr_ifp = ifp; 532 /* this should be 64 at this moment. */ 533 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 534 pr0.ndpr_prefix = ifra.ifra_addr; 535 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 536 for (i = 0; i < 4; i++) { 537 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 538 in6mask64.s6_addr32[i]; 539 } 540 /* 541 * Initialize parameters. The link-local prefix must always be 542 * on-link, and its lifetimes never expire. 543 */ 544 pr0.ndpr_raf_onlink = 1; 545 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 546 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 547 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 548 /* 549 * Since there is no other link-local addresses, nd6_prefix_lookup() 550 * probably returns NULL. However, we cannot always expect the result. 551 * For example, if we first remove the (only) existing link-local 552 * address, and then reconfigure another one, the prefix is still 553 * valid with referring to the old link-local address. 554 */ 555 if (nd6_prefix_lookup(&pr0) == NULL) { 556 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 557 return (error); 558 } 559 560 return 0; 561} 562 563/* 564 * ifp - must be IFT_LOOP 565 */ 566static int 567in6_ifattach_loopback(struct ifnet *ifp) 568{ 569 struct in6_aliasreq ifra; 570 int error; 571 572 bzero(&ifra, sizeof(ifra)); 573 574 /* 575 * in6_update_ifa() does not use ifra_name, but we accurately set it 576 * for safety. 577 */ 578 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 579 580 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 581 ifra.ifra_prefixmask.sin6_family = AF_INET6; 582 ifra.ifra_prefixmask.sin6_addr = in6mask128; 583 584 /* 585 * Always initialize ia_dstaddr (= broadcast address) to loopback 586 * address. Follows IPv4 practice - see in_ifinit(). 587 */ 588 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 589 ifra.ifra_dstaddr.sin6_family = AF_INET6; 590 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 591 592 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 593 ifra.ifra_addr.sin6_family = AF_INET6; 594 ifra.ifra_addr.sin6_addr = in6addr_loopback; 595 596 /* the loopback address should NEVER expire. */ 597 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 598 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 599 600 /* we don't need to perform DAD on loopback interfaces. */ 601 ifra.ifra_flags |= IN6_IFF_NODAD; 602 603 /* skip registration to the prefix list. XXX should be temporary. */ 604 ifra.ifra_flags |= IN6_IFF_NOPFX; 605 606 /* 607 * We are sure that this is a newly assigned address, so we can set 608 * NULL to the 3rd arg. 609 */ 610 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 611 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 612 "the loopback address on %s (errno=%d)\n", 613 if_name(ifp), error)); 614 return (-1); 615 } 616 617 return 0; 618} 619 620/* 621 * compute NI group address, based on the current hostname setting. 622 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 623 * 624 * when ifp == NULL, the caller is responsible for filling scopeid. 625 */ 626int 627in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 628 struct in6_addr *in6) 629{ 630 struct prison *pr; 631 const char *p; 632 u_char *q; 633 MD5_CTX ctxt; 634 u_int8_t digest[16]; 635 char l; 636 char n[64]; /* a single label must not exceed 63 chars */ 637 638 /* 639 * If no name is given and namelen is -1, 640 * we try to do the hostname lookup ourselves. 641 */ 642 if (!name && namelen == -1) { 643 pr = curthread->td_ucred->cr_prison; 644 mtx_lock(&pr->pr_mtx); 645 name = pr->pr_hostname; 646 namelen = strlen(name); 647 } else 648 pr = NULL; 649 if (!name || !namelen) { 650 if (pr != NULL) 651 mtx_unlock(&pr->pr_mtx); 652 return -1; 653 } 654 655 p = name; 656 while (p && *p && *p != '.' && p - name < namelen) 657 p++; 658 if (p == name || p - name > sizeof(n) - 1) { 659 if (pr != NULL) 660 mtx_unlock(&pr->pr_mtx); 661 return -1; /* label too long */ 662 } 663 l = p - name; 664 strncpy(n, name, l); 665 if (pr != NULL) 666 mtx_unlock(&pr->pr_mtx); 667 n[(int)l] = '\0'; 668 for (q = n; *q; q++) { 669 if ('A' <= *q && *q <= 'Z') 670 *q = *q - 'A' + 'a'; 671 } 672 673 /* generate 8 bytes of pseudo-random value. */ 674 bzero(&ctxt, sizeof(ctxt)); 675 MD5Init(&ctxt); 676 MD5Update(&ctxt, &l, sizeof(l)); 677 MD5Update(&ctxt, n, l); 678 MD5Final(digest, &ctxt); 679 680 bzero(in6, sizeof(*in6)); 681 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 682 in6->s6_addr8[11] = 2; 683 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 684 if (in6_setscope(in6, ifp, NULL)) 685 return (-1); /* XXX: should not fail */ 686 687 return 0; 688} 689 690/* 691 * XXX multiple loopback interface needs more care. for instance, 692 * nodelocal address needs to be configured onto only one of them. 693 * XXX multiple link-local address case 694 * 695 * altifp - secondary EUI64 source 696 */ 697void 698in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 699{ 700 struct in6_ifaddr *ia; 701 struct in6_addr in6; 702 703 /* some of the interfaces are inherently not IPv6 capable */ 704 switch (ifp->if_type) { 705 case IFT_PFLOG: 706 case IFT_PFSYNC: 707 case IFT_CARP: 708 return; 709 } 710 711 /* 712 * quirks based on interface type 713 */ 714 switch (ifp->if_type) { 715#ifdef IFT_STF 716 case IFT_STF: 717 /* 718 * 6to4 interface is a very special kind of beast. 719 * no multicast, no linklocal. RFC2529 specifies how to make 720 * linklocals for 6to4 interface, but there's no use and 721 * it is rather harmful to have one. 722 */ 723 goto statinit; 724#endif 725 default: 726 break; 727 } 728 729 /* 730 * usually, we require multicast capability to the interface 731 */ 732 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 733 nd6log((LOG_INFO, "in6_ifattach: " 734 "%s is not multicast capable, IPv6 not enabled\n", 735 if_name(ifp))); 736 return; 737 } 738 739 /* 740 * assign loopback address for loopback interface. 741 * XXX multiple loopback interface case. 742 */ 743 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 744 struct ifaddr *ifa; 745 746 in6 = in6addr_loopback; 747 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 748 if (ifa == NULL) { 749 if (in6_ifattach_loopback(ifp) != 0) 750 return; 751 } else 752 ifa_free(ifa); 753 } 754 755 /* 756 * assign a link-local address, if there's none. 757 */ 758 if (ifp->if_type != IFT_BRIDGE && 759 !(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 760 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 761 int error; 762 763 ia = in6ifa_ifpforlinklocal(ifp, 0); 764 if (ia == NULL) { 765 error = in6_ifattach_linklocal(ifp, altifp); 766#if 0 767 if (error) 768 log(LOG_NOTICE, "in6_ifattach_linklocal: " 769 "failed to add a link-local addr to %s\n", 770 if_name(ifp)); 771#endif 772 } else 773 ifa_free(&ia->ia_ifa); 774 } 775 776#ifdef IFT_STF /* XXX */ 777statinit: 778#endif 779 780 /* update dynamically. */ 781 if (V_in6_maxmtu < ifp->if_mtu) 782 V_in6_maxmtu = ifp->if_mtu; 783} 784 785/* 786 * NOTE: in6_ifdetach() does not support loopback if at this moment. 787 * We don't need this function in bsdi, because interfaces are never removed 788 * from the ifnet list in bsdi. 789 */ 790void 791in6_ifdetach(struct ifnet *ifp) 792{ 793 struct in6_ifaddr *ia; 794 struct ifaddr *ifa, *next; 795 struct radix_node_head *rnh; 796 struct rtentry *rt; 797 short rtflags; 798 struct sockaddr_in6 sin6; 799 struct in6_multi_mship *imm; 800 801 /* remove neighbor management table */ 802 nd6_purge(ifp); 803 804 /* nuke any of IPv6 addresses we have */ 805 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 806 if (ifa->ifa_addr->sa_family != AF_INET6) 807 continue; 808 in6_purgeaddr(ifa); 809 } 810 811 /* undo everything done by in6_ifattach(), just in case */ 812 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 813 if (ifa->ifa_addr->sa_family != AF_INET6 814 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 815 continue; 816 } 817 818 ia = (struct in6_ifaddr *)ifa; 819 820 /* 821 * leave from multicast groups we have joined for the interface 822 */ 823 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 824 LIST_REMOVE(imm, i6mm_chain); 825 in6_leavegroup(imm); 826 } 827 828 /* remove from the routing table */ 829 if ((ia->ia_flags & IFA_ROUTE) && 830 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 831 rtflags = rt->rt_flags; 832 RTFREE_LOCKED(rt); 833 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 834 (struct sockaddr *)&ia->ia_addr, 835 (struct sockaddr *)&ia->ia_prefixmask, 836 rtflags, (struct rtentry **)0); 837 } 838 839 /* remove from the linked list */ 840 IF_ADDR_LOCK(ifp); 841 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 842 IF_ADDR_UNLOCK(ifp); 843 ifa_free(ifa); /* if_addrhead */ 844 845 IN6_IFADDR_WLOCK(); 846 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 847 IN6_IFADDR_WUNLOCK(); 848 ifa_free(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 struct nd_ifinfo *ndi; 918 u_int8_t nullbuf[8]; 919 struct ifnet *ifp; 920 921 callout_reset(&V_in6_tmpaddrtimer_ch, 922 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 923 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 924 925 bzero(nullbuf, sizeof(nullbuf)); 926 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 927 ifp = TAILQ_NEXT(ifp, if_list)) { 928 ndi = ND_IFINFO(ifp); 929 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 930 /* 931 * We've been generating a random ID on this interface. 932 * Create a new one. 933 */ 934 (void)generate_tmp_ifid(ndi->randomseed0, 935 ndi->randomseed1, ndi->randomid); 936 } 937 } 938 939 CURVNET_RESTORE(); 940} 941 942static void 943in6_purgemaddrs(struct ifnet *ifp) 944{ 945 LIST_HEAD(,in6_multi) purgeinms; 946 struct in6_multi *inm, *tinm; 947 struct ifmultiaddr *ifma; 948 949 LIST_INIT(&purgeinms); 950 IN6_MULTI_LOCK(); 951 952 /* 953 * Extract list of in6_multi associated with the detaching ifp 954 * which the PF_INET6 layer is about to release. 955 * We need to do this as IF_ADDR_LOCK() may be re-acquired 956 * by code further down. 957 */ 958 IF_ADDR_LOCK(ifp); 959 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 960 if (ifma->ifma_addr->sa_family != AF_INET6 || 961 ifma->ifma_protospec == NULL) 962 continue; 963 inm = (struct in6_multi *)ifma->ifma_protospec; 964 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 965 } 966 IF_ADDR_UNLOCK(ifp); 967 968 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 969 LIST_REMOVE(inm, in6m_entry); 970 in6m_release_locked(inm); 971 } 972 mld_ifdetach(ifp); 973 974 IN6_MULTI_UNLOCK(); 975} 976