in6_ifattach.c revision 233046
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: stable/9/sys/netinet6/in6_ifattach.c 233046 2012-03-16 21:28:05Z jhb $"); 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_L2VLAN: 271 case IFT_FDDI: 272 case IFT_ISO88025: 273 case IFT_ATM: 274 case IFT_IEEE1394: 275#ifdef IFT_IEEE80211 276 case IFT_IEEE80211: 277#endif 278 /* IEEE802/EUI64 cases - what others? */ 279 /* IEEE1394 uses 16byte length address starting with EUI64 */ 280 if (addrlen > 8) 281 addrlen = 8; 282 283 /* look at IEEE802/EUI64 only */ 284 if (addrlen != 8 && addrlen != 6) { 285 IF_ADDR_UNLOCK(ifp); 286 return -1; 287 } 288 289 /* 290 * check for invalid MAC address - on bsdi, we see it a lot 291 * since wildboar configures all-zero MAC on pccard before 292 * card insertion. 293 */ 294 if (bcmp(addr, allzero, addrlen) == 0) { 295 IF_ADDR_UNLOCK(ifp); 296 return -1; 297 } 298 if (bcmp(addr, allone, addrlen) == 0) { 299 IF_ADDR_UNLOCK(ifp); 300 return -1; 301 } 302 303 /* make EUI64 address */ 304 if (addrlen == 8) 305 bcopy(addr, &in6->s6_addr[8], 8); 306 else if (addrlen == 6) { 307 in6->s6_addr[8] = addr[0]; 308 in6->s6_addr[9] = addr[1]; 309 in6->s6_addr[10] = addr[2]; 310 in6->s6_addr[11] = 0xff; 311 in6->s6_addr[12] = 0xfe; 312 in6->s6_addr[13] = addr[3]; 313 in6->s6_addr[14] = addr[4]; 314 in6->s6_addr[15] = addr[5]; 315 } 316 break; 317 318 case IFT_ARCNET: 319 if (addrlen != 1) { 320 IF_ADDR_UNLOCK(ifp); 321 return -1; 322 } 323 if (!addr[0]) { 324 IF_ADDR_UNLOCK(ifp); 325 return -1; 326 } 327 328 bzero(&in6->s6_addr[8], 8); 329 in6->s6_addr[15] = addr[0]; 330 331 /* 332 * due to insufficient bitwidth, we mark it local. 333 */ 334 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 335 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 336 break; 337 338 case IFT_GIF: 339#ifdef IFT_STF 340 case IFT_STF: 341#endif 342 /* 343 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 344 * however, IPv4 address is not very suitable as unique 345 * identifier source (can be renumbered). 346 * we don't do this. 347 */ 348 IF_ADDR_UNLOCK(ifp); 349 return -1; 350 351 default: 352 IF_ADDR_UNLOCK(ifp); 353 return -1; 354 } 355 356 /* sanity check: g bit must not indicate "group" */ 357 if (EUI64_GROUP(in6)) { 358 IF_ADDR_UNLOCK(ifp); 359 return -1; 360 } 361 362 /* convert EUI64 into IPv6 interface identifier */ 363 EUI64_TO_IFID(in6); 364 365 /* 366 * sanity check: ifid must not be all zero, avoid conflict with 367 * subnet router anycast 368 */ 369 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 370 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 371 IF_ADDR_UNLOCK(ifp); 372 return -1; 373 } 374 375 IF_ADDR_UNLOCK(ifp); 376 return 0; 377} 378 379/* 380 * Get interface identifier for the specified interface. If it is not 381 * available on ifp0, borrow interface identifier from other information 382 * sources. 383 * 384 * altifp - secondary EUI64 source 385 */ 386static int 387get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 388 struct in6_addr *in6) 389{ 390 struct ifnet *ifp; 391 392 /* first, try to get it from the interface itself */ 393 if (in6_get_hw_ifid(ifp0, in6) == 0) { 394 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 395 if_name(ifp0))); 396 goto success; 397 } 398 399 /* try secondary EUI64 source. this basically is for ATM PVC */ 400 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 401 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 402 if_name(ifp0), if_name(altifp))); 403 goto success; 404 } 405 406 /* next, try to get it from some other hardware interface */ 407 IFNET_RLOCK_NOSLEEP(); 408 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 409 if (ifp == ifp0) 410 continue; 411 if (in6_get_hw_ifid(ifp, in6) != 0) 412 continue; 413 414 /* 415 * to borrow ifid from other interface, ifid needs to be 416 * globally unique 417 */ 418 if (IFID_UNIVERSAL(in6)) { 419 nd6log((LOG_DEBUG, 420 "%s: borrow interface identifier from %s\n", 421 if_name(ifp0), if_name(ifp))); 422 IFNET_RUNLOCK_NOSLEEP(); 423 goto success; 424 } 425 } 426 IFNET_RUNLOCK_NOSLEEP(); 427 428 /* last resort: get from random number source */ 429 if (get_rand_ifid(ifp, in6) == 0) { 430 nd6log((LOG_DEBUG, 431 "%s: interface identifier generated by random number\n", 432 if_name(ifp0))); 433 goto success; 434 } 435 436 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 437 return -1; 438 439success: 440 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 441 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 442 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 443 in6->s6_addr[14], in6->s6_addr[15])); 444 return 0; 445} 446 447/* 448 * altifp - secondary EUI64 source 449 */ 450static int 451in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 452{ 453 struct in6_ifaddr *ia; 454 struct in6_aliasreq ifra; 455 struct nd_prefixctl pr0; 456 int i, error; 457 458 /* 459 * configure link-local address. 460 */ 461 bzero(&ifra, sizeof(ifra)); 462 463 /* 464 * in6_update_ifa() does not use ifra_name, but we accurately set it 465 * for safety. 466 */ 467 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 468 469 ifra.ifra_addr.sin6_family = AF_INET6; 470 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 471 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 472 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 473 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 474 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 475 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 476 } else { 477 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 478 nd6log((LOG_ERR, 479 "%s: no ifid available\n", if_name(ifp))); 480 return (-1); 481 } 482 } 483 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 484 return (-1); 485 486 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 487 ifra.ifra_prefixmask.sin6_family = AF_INET6; 488 ifra.ifra_prefixmask.sin6_addr = in6mask64; 489 /* link-local addresses should NEVER expire. */ 490 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 491 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 492 493 /* 494 * Now call in6_update_ifa() to do a bunch of procedures to configure 495 * a link-local address. We can set the 3rd argument to NULL, because 496 * we know there's no other link-local address on the interface 497 * and therefore we are adding one (instead of updating one). 498 */ 499 if ((error = in6_update_ifa(ifp, &ifra, NULL, 500 IN6_IFAUPDATE_DADDELAY)) != 0) { 501 /* 502 * XXX: When the interface does not support IPv6, this call 503 * would fail in the SIOCSIFADDR ioctl. I believe the 504 * notification is rather confusing in this case, so just 505 * suppress it. (jinmei@kame.net 20010130) 506 */ 507 if (error != EAFNOSUPPORT) 508 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 509 "configure a link-local address on %s " 510 "(errno=%d)\n", 511 if_name(ifp), error)); 512 return (-1); 513 } 514 515 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 516 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 517 518 ifa_free(&ia->ia_ifa); 519 520 /* 521 * Make the link-local prefix (fe80::%link/64) as on-link. 522 * Since we'd like to manage prefixes separately from addresses, 523 * we make an ND6 prefix structure for the link-local prefix, 524 * and add it to the prefix list as a never-expire prefix. 525 * XXX: this change might affect some existing code base... 526 */ 527 bzero(&pr0, sizeof(pr0)); 528 pr0.ndpr_ifp = ifp; 529 /* this should be 64 at this moment. */ 530 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 531 pr0.ndpr_prefix = ifra.ifra_addr; 532 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 533 for (i = 0; i < 4; i++) { 534 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 535 in6mask64.s6_addr32[i]; 536 } 537 /* 538 * Initialize parameters. The link-local prefix must always be 539 * on-link, and its lifetimes never expire. 540 */ 541 pr0.ndpr_raf_onlink = 1; 542 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 543 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 544 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 545 /* 546 * Since there is no other link-local addresses, nd6_prefix_lookup() 547 * probably returns NULL. However, we cannot always expect the result. 548 * For example, if we first remove the (only) existing link-local 549 * address, and then reconfigure another one, the prefix is still 550 * valid with referring to the old link-local address. 551 */ 552 if (nd6_prefix_lookup(&pr0) == NULL) { 553 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 554 return (error); 555 } 556 557 return 0; 558} 559 560/* 561 * ifp - must be IFT_LOOP 562 */ 563static int 564in6_ifattach_loopback(struct ifnet *ifp) 565{ 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 struct in6_ifaddr *ia; 698 struct in6_addr in6; 699 700 /* some of the interfaces are inherently not IPv6 capable */ 701 switch (ifp->if_type) { 702 case IFT_PFLOG: 703 case IFT_PFSYNC: 704 case IFT_CARP: 705 return; 706 } 707 708 /* 709 * quirks based on interface type 710 */ 711 switch (ifp->if_type) { 712#ifdef IFT_STF 713 case IFT_STF: 714 /* 715 * 6to4 interface is a very special kind of beast. 716 * no multicast, no linklocal. RFC2529 specifies how to make 717 * linklocals for 6to4 interface, but there's no use and 718 * it is rather harmful to have one. 719 */ 720 goto statinit; 721#endif 722 default: 723 break; 724 } 725 726 /* 727 * usually, we require multicast capability to the interface 728 */ 729 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 730 nd6log((LOG_INFO, "in6_ifattach: " 731 "%s is not multicast capable, IPv6 not enabled\n", 732 if_name(ifp))); 733 return; 734 } 735 736 /* 737 * assign loopback address for loopback interface. 738 * XXX multiple loopback interface case. 739 */ 740 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 741 struct ifaddr *ifa; 742 743 in6 = in6addr_loopback; 744 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 745 if (ifa == NULL) { 746 if (in6_ifattach_loopback(ifp) != 0) 747 return; 748 } else 749 ifa_free(ifa); 750 } 751 752 /* 753 * assign a link-local address, if there's none. 754 */ 755 if (ifp->if_type != IFT_BRIDGE && 756 !(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 757 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 758 int error; 759 760 ia = in6ifa_ifpforlinklocal(ifp, 0); 761 if (ia == NULL) { 762 error = in6_ifattach_linklocal(ifp, altifp); 763#if 0 764 if (error) 765 log(LOG_NOTICE, "in6_ifattach_linklocal: " 766 "failed to add a link-local addr to %s\n", 767 if_name(ifp)); 768#endif 769 } else 770 ifa_free(&ia->ia_ifa); 771 } 772 773#ifdef IFT_STF /* XXX */ 774statinit: 775#endif 776 777 /* update dynamically. */ 778 if (V_in6_maxmtu < ifp->if_mtu) 779 V_in6_maxmtu = ifp->if_mtu; 780} 781 782/* 783 * NOTE: in6_ifdetach() does not support loopback if at this moment. 784 * We don't need this function in bsdi, because interfaces are never removed 785 * from the ifnet list in bsdi. 786 */ 787void 788in6_ifdetach(struct ifnet *ifp) 789{ 790 struct in6_ifaddr *ia; 791 struct ifaddr *ifa, *next; 792 struct radix_node_head *rnh; 793 struct rtentry *rt; 794 struct sockaddr_in6 sin6; 795 struct in6_multi_mship *imm; 796 797 /* remove neighbor management table */ 798 nd6_purge(ifp); 799 800 /* nuke any of IPv6 addresses we have */ 801 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 802 if (ifa->ifa_addr->sa_family != AF_INET6) 803 continue; 804 in6_purgeaddr(ifa); 805 } 806 807 /* undo everything done by in6_ifattach(), just in case */ 808 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 809 if (ifa->ifa_addr->sa_family != AF_INET6 810 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 811 continue; 812 } 813 814 ia = (struct in6_ifaddr *)ifa; 815 816 /* 817 * leave from multicast groups we have joined for the interface 818 */ 819 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 820 LIST_REMOVE(imm, i6mm_chain); 821 in6_leavegroup(imm); 822 } 823 824 /* Remove link-local from the routing table. */ 825 if (ia->ia_flags & IFA_ROUTE) 826 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags); 827 828 /* remove from the linked list */ 829 IF_ADDR_LOCK(ifp); 830 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 831 IF_ADDR_UNLOCK(ifp); 832 ifa_free(ifa); /* if_addrhead */ 833 834 IN6_IFADDR_WLOCK(); 835 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 836 IN6_IFADDR_WUNLOCK(); 837 ifa_free(ifa); 838 } 839 840 in6_pcbpurgeif0(&V_udbinfo, ifp); 841 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 842 /* leave from all multicast groups joined */ 843 in6_purgemaddrs(ifp); 844 845 /* 846 * remove neighbor management table. we call it twice just to make 847 * sure we nuke everything. maybe we need just one call. 848 * XXX: since the first call did not release addresses, some prefixes 849 * might remain. We should call nd6_purge() again to release the 850 * prefixes after removing all addresses above. 851 * (Or can we just delay calling nd6_purge until at this point?) 852 */ 853 nd6_purge(ifp); 854 855 /* 856 * Remove route to link-local allnodes multicast (ff02::1). 857 * These only get automatically installed for the default FIB. 858 */ 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(RT_DEFAULT_FIB, AF_INET6); 868 if (rnh != NULL) { 869 RADIX_NODE_HEAD_LOCK(rnh); 870 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED, 871 RT_DEFAULT_FIB); 872 if (rt) { 873 if (rt->rt_ifp == ifp) 874 rtexpunge(rt); 875 RTFREE_LOCKED(rt); 876 } 877 RADIX_NODE_HEAD_UNLOCK(rnh); 878 } 879} 880 881int 882in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 883 const u_int8_t *baseid, int generate) 884{ 885 u_int8_t nullbuf[8]; 886 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 887 888 bzero(nullbuf, sizeof(nullbuf)); 889 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 890 /* we've never created a random ID. Create a new one. */ 891 generate = 1; 892 } 893 894 if (generate) { 895 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 896 897 /* generate_tmp_ifid will update seedn and buf */ 898 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 899 ndi->randomid); 900 } 901 bcopy(ndi->randomid, retbuf, 8); 902 903 return (0); 904} 905 906void 907in6_tmpaddrtimer(void *arg) 908{ 909 CURVNET_SET((struct vnet *) arg); 910 struct nd_ifinfo *ndi; 911 u_int8_t nullbuf[8]; 912 struct ifnet *ifp; 913 914 callout_reset(&V_in6_tmpaddrtimer_ch, 915 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 916 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 917 918 bzero(nullbuf, sizeof(nullbuf)); 919 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 920 ndi = ND_IFINFO(ifp); 921 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 922 /* 923 * We've been generating a random ID on this interface. 924 * Create a new one. 925 */ 926 (void)generate_tmp_ifid(ndi->randomseed0, 927 ndi->randomseed1, ndi->randomid); 928 } 929 } 930 931 CURVNET_RESTORE(); 932} 933 934static void 935in6_purgemaddrs(struct ifnet *ifp) 936{ 937 LIST_HEAD(,in6_multi) purgeinms; 938 struct in6_multi *inm, *tinm; 939 struct ifmultiaddr *ifma; 940 941 LIST_INIT(&purgeinms); 942 IN6_MULTI_LOCK(); 943 944 /* 945 * Extract list of in6_multi associated with the detaching ifp 946 * which the PF_INET6 layer is about to release. 947 * We need to do this as IF_ADDR_LOCK() may be re-acquired 948 * by code further down. 949 */ 950 IF_ADDR_LOCK(ifp); 951 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 952 if (ifma->ifma_addr->sa_family != AF_INET6 || 953 ifma->ifma_protospec == NULL) 954 continue; 955 inm = (struct in6_multi *)ifma->ifma_protospec; 956 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 957 } 958 IF_ADDR_UNLOCK(ifp); 959 960 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 961 LIST_REMOVE(inm, in6m_entry); 962 in6m_release_locked(inm); 963 } 964 mld_ifdetach(ifp); 965 966 IN6_MULTI_UNLOCK(); 967} 968