in6_ifattach.c revision 196019
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 196019 2009-08-01 19:26:27Z 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/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); 71VNET_DEFINE(int, ip6_auto_linklocal); 72VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 73 74#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 75 76VNET_DECLARE(struct inpcbinfo, ripcbinfo); 77#define V_ripcbinfo VNET(ripcbinfo) 78 79static int get_rand_ifid(struct ifnet *, struct in6_addr *); 80static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 81static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 82static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 83static int in6_ifattach_loopback(struct ifnet *); 84static void in6_purgemaddrs(struct ifnet *); 85 86#define EUI64_GBIT 0x01 87#define EUI64_UBIT 0x02 88#define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 89#define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 90#define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 91#define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 92#define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 93 94#define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 95#define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 96 97/* 98 * Generate a last-resort interface identifier, when the machine has no 99 * IEEE802/EUI64 address sources. 100 * The goal here is to get an interface identifier that is 101 * (1) random enough and (2) does not change across reboot. 102 * We currently use MD5(hostname) for it. 103 * 104 * in6 - upper 64bits are preserved 105 */ 106static int 107get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 108{ 109 MD5_CTX ctxt; 110 struct prison *pr; 111 u_int8_t digest[16]; 112 int hostnamelen; 113 114 pr = curthread->td_ucred->cr_prison; 115 mtx_lock(&pr->pr_mtx); 116 hostnamelen = strlen(pr->pr_hostname); 117#if 0 118 /* we need at least several letters as seed for ifid */ 119 if (hostnamelen < 3) { 120 mtx_unlock(&pr->pr_mtx); 121 return -1; 122 } 123#endif 124 125 /* generate 8 bytes of pseudo-random value. */ 126 bzero(&ctxt, sizeof(ctxt)); 127 MD5Init(&ctxt); 128 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 129 mtx_unlock(&pr->pr_mtx); 130 MD5Final(digest, &ctxt); 131 132 /* assumes sizeof(digest) > sizeof(ifid) */ 133 bcopy(digest, &in6->s6_addr[8], 8); 134 135 /* make sure to set "u" bit to local, and "g" bit to individual. */ 136 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 137 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 138 139 /* convert EUI64 into IPv6 interface identifier */ 140 EUI64_TO_IFID(in6); 141 142 return 0; 143} 144 145static int 146generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 147{ 148 MD5_CTX ctxt; 149 u_int8_t seed[16], digest[16], nullbuf[8]; 150 u_int32_t val32; 151 152 /* If there's no history, start with a random seed. */ 153 bzero(nullbuf, sizeof(nullbuf)); 154 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 155 int i; 156 157 for (i = 0; i < 2; i++) { 158 val32 = arc4random(); 159 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 160 } 161 } else 162 bcopy(seed0, seed, 8); 163 164 /* copy the right-most 64-bits of the given address */ 165 /* XXX assumption on the size of IFID */ 166 bcopy(seed1, &seed[8], 8); 167 168 if (0) { /* for debugging purposes only */ 169 int i; 170 171 printf("generate_tmp_ifid: new randomized ID from: "); 172 for (i = 0; i < 16; i++) 173 printf("%02x", seed[i]); 174 printf(" "); 175 } 176 177 /* generate 16 bytes of pseudo-random value. */ 178 bzero(&ctxt, sizeof(ctxt)); 179 MD5Init(&ctxt); 180 MD5Update(&ctxt, seed, sizeof(seed)); 181 MD5Final(digest, &ctxt); 182 183 /* 184 * RFC 3041 3.2.1. (3) 185 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 186 * left-most bit is numbered 0) to zero. 187 */ 188 bcopy(digest, ret, 8); 189 ret[0] &= ~EUI64_UBIT; 190 191 /* 192 * XXX: we'd like to ensure that the generated value is not zero 193 * for simplicity. If the caclculated digest happens to be zero, 194 * use a random non-zero value as the last resort. 195 */ 196 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 197 nd6log((LOG_INFO, 198 "generate_tmp_ifid: computed MD5 value is zero.\n")); 199 200 val32 = arc4random(); 201 val32 = 1 + (val32 % (0xffffffff - 1)); 202 } 203 204 /* 205 * RFC 3041 3.2.1. (4) 206 * Take the rightmost 64-bits of the MD5 digest and save them in 207 * stable storage as the history value to be used in the next 208 * iteration of the algorithm. 209 */ 210 bcopy(&digest[8], seed0, 8); 211 212 if (0) { /* for debugging purposes only */ 213 int i; 214 215 printf("to: "); 216 for (i = 0; i < 16; i++) 217 printf("%02x", digest[i]); 218 printf("\n"); 219 } 220 221 return 0; 222} 223 224/* 225 * Get interface identifier for the specified interface. 226 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 227 * 228 * in6 - upper 64bits are preserved 229 */ 230int 231in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 232{ 233 struct ifaddr *ifa; 234 struct sockaddr_dl *sdl; 235 u_int8_t *addr; 236 size_t addrlen; 237 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 238 static u_int8_t allone[8] = 239 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 240 241 IF_ADDR_LOCK(ifp); 242 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 243 if (ifa->ifa_addr->sa_family != AF_LINK) 244 continue; 245 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 246 if (sdl == NULL) 247 continue; 248 if (sdl->sdl_alen == 0) 249 continue; 250 251 goto found; 252 } 253 IF_ADDR_UNLOCK(ifp); 254 255 return -1; 256 257found: 258 IF_ADDR_LOCK_ASSERT(ifp); 259 addr = LLADDR(sdl); 260 addrlen = sdl->sdl_alen; 261 262 /* get EUI64 */ 263 switch (ifp->if_type) { 264 case IFT_ETHER: 265 case IFT_FDDI: 266 case IFT_ISO88025: 267 case IFT_ATM: 268 case IFT_IEEE1394: 269#ifdef IFT_IEEE80211 270 case IFT_IEEE80211: 271#endif 272 /* IEEE802/EUI64 cases - what others? */ 273 /* IEEE1394 uses 16byte length address starting with EUI64 */ 274 if (addrlen > 8) 275 addrlen = 8; 276 277 /* look at IEEE802/EUI64 only */ 278 if (addrlen != 8 && addrlen != 6) { 279 IF_ADDR_UNLOCK(ifp); 280 return -1; 281 } 282 283 /* 284 * check for invalid MAC address - on bsdi, we see it a lot 285 * since wildboar configures all-zero MAC on pccard before 286 * card insertion. 287 */ 288 if (bcmp(addr, allzero, addrlen) == 0) { 289 IF_ADDR_UNLOCK(ifp); 290 return -1; 291 } 292 if (bcmp(addr, allone, addrlen) == 0) { 293 IF_ADDR_UNLOCK(ifp); 294 return -1; 295 } 296 297 /* make EUI64 address */ 298 if (addrlen == 8) 299 bcopy(addr, &in6->s6_addr[8], 8); 300 else if (addrlen == 6) { 301 in6->s6_addr[8] = addr[0]; 302 in6->s6_addr[9] = addr[1]; 303 in6->s6_addr[10] = addr[2]; 304 in6->s6_addr[11] = 0xff; 305 in6->s6_addr[12] = 0xfe; 306 in6->s6_addr[13] = addr[3]; 307 in6->s6_addr[14] = addr[4]; 308 in6->s6_addr[15] = addr[5]; 309 } 310 break; 311 312 case IFT_ARCNET: 313 if (addrlen != 1) { 314 IF_ADDR_UNLOCK(ifp); 315 return -1; 316 } 317 if (!addr[0]) { 318 IF_ADDR_UNLOCK(ifp); 319 return -1; 320 } 321 322 bzero(&in6->s6_addr[8], 8); 323 in6->s6_addr[15] = addr[0]; 324 325 /* 326 * due to insufficient bitwidth, we mark it local. 327 */ 328 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 329 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 330 break; 331 332 case IFT_GIF: 333#ifdef IFT_STF 334 case IFT_STF: 335#endif 336 /* 337 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 338 * however, IPv4 address is not very suitable as unique 339 * identifier source (can be renumbered). 340 * we don't do this. 341 */ 342 IF_ADDR_UNLOCK(ifp); 343 return -1; 344 345 default: 346 IF_ADDR_UNLOCK(ifp); 347 return -1; 348 } 349 350 /* sanity check: g bit must not indicate "group" */ 351 if (EUI64_GROUP(in6)) { 352 IF_ADDR_UNLOCK(ifp); 353 return -1; 354 } 355 356 /* convert EUI64 into IPv6 interface identifier */ 357 EUI64_TO_IFID(in6); 358 359 /* 360 * sanity check: ifid must not be all zero, avoid conflict with 361 * subnet router anycast 362 */ 363 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 364 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 365 IF_ADDR_UNLOCK(ifp); 366 return -1; 367 } 368 369 IF_ADDR_UNLOCK(ifp); 370 return 0; 371} 372 373/* 374 * Get interface identifier for the specified interface. If it is not 375 * available on ifp0, borrow interface identifier from other information 376 * sources. 377 * 378 * altifp - secondary EUI64 source 379 */ 380static int 381get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 382 struct in6_addr *in6) 383{ 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 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 ifa_free(&ia->ia_ifa); 517 518 /* 519 * Make the link-local prefix (fe80::%link/64) as on-link. 520 * Since we'd like to manage prefixes separately from addresses, 521 * we make an ND6 prefix structure for the link-local prefix, 522 * and add it to the prefix list as a never-expire prefix. 523 * XXX: this change might affect some existing code base... 524 */ 525 bzero(&pr0, sizeof(pr0)); 526 pr0.ndpr_ifp = ifp; 527 /* this should be 64 at this moment. */ 528 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 529 pr0.ndpr_prefix = ifra.ifra_addr; 530 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 531 for (i = 0; i < 4; i++) { 532 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 533 in6mask64.s6_addr32[i]; 534 } 535 /* 536 * Initialize parameters. The link-local prefix must always be 537 * on-link, and its lifetimes never expire. 538 */ 539 pr0.ndpr_raf_onlink = 1; 540 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 541 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 542 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 543 /* 544 * Since there is no other link-local addresses, nd6_prefix_lookup() 545 * probably returns NULL. However, we cannot always expect the result. 546 * For example, if we first remove the (only) existing link-local 547 * address, and then reconfigure another one, the prefix is still 548 * valid with referring to the old link-local address. 549 */ 550 if (nd6_prefix_lookup(&pr0) == NULL) { 551 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 552 return (error); 553 } 554 555 return 0; 556} 557 558/* 559 * ifp - must be IFT_LOOP 560 */ 561static int 562in6_ifattach_loopback(struct ifnet *ifp) 563{ 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_hostname; 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 struct in6_ifaddr *ia; 696 struct in6_addr in6; 697 698 /* some of the interfaces are inherently not IPv6 capable */ 699 switch (ifp->if_type) { 700 case IFT_PFLOG: 701 case IFT_PFSYNC: 702 case IFT_CARP: 703 return; 704 } 705 706 /* 707 * quirks based on interface type 708 */ 709 switch (ifp->if_type) { 710#ifdef IFT_STF 711 case IFT_STF: 712 /* 713 * 6to4 interface is a very special kind of beast. 714 * no multicast, no linklocal. RFC2529 specifies how to make 715 * linklocals for 6to4 interface, but there's no use and 716 * it is rather harmful to have one. 717 */ 718 goto statinit; 719#endif 720 default: 721 break; 722 } 723 724 /* 725 * usually, we require multicast capability to the interface 726 */ 727 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 728 nd6log((LOG_INFO, "in6_ifattach: " 729 "%s is not multicast capable, IPv6 not enabled\n", 730 if_name(ifp))); 731 return; 732 } 733 734 /* 735 * assign loopback address for loopback interface. 736 * XXX multiple loopback interface case. 737 */ 738 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 739 struct ifaddr *ifa; 740 741 in6 = in6addr_loopback; 742 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 743 if (ifa == NULL) { 744 if (in6_ifattach_loopback(ifp) != 0) 745 return; 746 } else 747 ifa_free(ifa); 748 } 749 750 /* 751 * assign a link-local address, if there's none. 752 */ 753 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 754 ia = in6ifa_ifpforlinklocal(ifp, 0); 755 if (ia == NULL) { 756 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 757 /* linklocal address assigned */ 758 } else { 759 /* failed to assign linklocal address. bark? */ 760 } 761 } else 762 ifa_free(&ia->ia_ifa); 763 } 764 765#ifdef IFT_STF /* XXX */ 766statinit: 767#endif 768 769 /* update dynamically. */ 770 if (V_in6_maxmtu < ifp->if_mtu) 771 V_in6_maxmtu = ifp->if_mtu; 772} 773 774/* 775 * NOTE: in6_ifdetach() does not support loopback if at this moment. 776 * We don't need this function in bsdi, because interfaces are never removed 777 * from the ifnet list in bsdi. 778 */ 779void 780in6_ifdetach(struct ifnet *ifp) 781{ 782 struct in6_ifaddr *ia; 783 struct ifaddr *ifa, *next; 784 struct radix_node_head *rnh; 785 struct rtentry *rt; 786 short rtflags; 787 struct sockaddr_in6 sin6; 788 struct in6_multi_mship *imm; 789 790 /* remove neighbor management table */ 791 nd6_purge(ifp); 792 793 /* nuke any of IPv6 addresses we have */ 794 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 795 if (ifa->ifa_addr->sa_family != AF_INET6) 796 continue; 797 in6_purgeaddr(ifa); 798 } 799 800 /* undo everything done by in6_ifattach(), just in case */ 801 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 802 if (ifa->ifa_addr->sa_family != AF_INET6 803 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 804 continue; 805 } 806 807 ia = (struct in6_ifaddr *)ifa; 808 809 /* 810 * leave from multicast groups we have joined for the interface 811 */ 812 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 813 LIST_REMOVE(imm, i6mm_chain); 814 in6_leavegroup(imm); 815 } 816 817 /* remove from the routing table */ 818 if ((ia->ia_flags & IFA_ROUTE) && 819 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 820 rtflags = rt->rt_flags; 821 RTFREE_LOCKED(rt); 822 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 823 (struct sockaddr *)&ia->ia_addr, 824 (struct sockaddr *)&ia->ia_prefixmask, 825 rtflags, (struct rtentry **)0); 826 } 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 /* remove route to link-local allnodes multicast (ff02::1) */ 856 bzero(&sin6, sizeof(sin6)); 857 sin6.sin6_len = sizeof(struct sockaddr_in6); 858 sin6.sin6_family = AF_INET6; 859 sin6.sin6_addr = in6addr_linklocal_allnodes; 860 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 861 /* XXX: should not fail */ 862 return; 863 /* XXX grab lock first to avoid LOR */ 864 rnh = rt_tables_get_rnh(0, AF_INET6); 865 if (rnh != NULL) { 866 RADIX_NODE_HEAD_LOCK(rnh); 867 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 868 if (rt) { 869 if (rt->rt_ifp == ifp) 870 rtexpunge(rt); 871 RTFREE_LOCKED(rt); 872 } 873 RADIX_NODE_HEAD_UNLOCK(rnh); 874 } 875} 876 877int 878in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 879 const u_int8_t *baseid, int generate) 880{ 881 u_int8_t nullbuf[8]; 882 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 883 884 bzero(nullbuf, sizeof(nullbuf)); 885 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 886 /* we've never created a random ID. Create a new one. */ 887 generate = 1; 888 } 889 890 if (generate) { 891 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 892 893 /* generate_tmp_ifid will update seedn and buf */ 894 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 895 ndi->randomid); 896 } 897 bcopy(ndi->randomid, retbuf, 8); 898 899 return (0); 900} 901 902void 903in6_tmpaddrtimer(void *arg) 904{ 905 CURVNET_SET((struct vnet *) arg); 906 struct nd_ifinfo *ndi; 907 u_int8_t nullbuf[8]; 908 struct ifnet *ifp; 909 910 callout_reset(&V_in6_tmpaddrtimer_ch, 911 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 912 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 913 914 bzero(nullbuf, sizeof(nullbuf)); 915 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 916 ifp = TAILQ_NEXT(ifp, if_list)) { 917 ndi = ND_IFINFO(ifp); 918 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 919 /* 920 * We've been generating a random ID on this interface. 921 * Create a new one. 922 */ 923 (void)generate_tmp_ifid(ndi->randomseed0, 924 ndi->randomseed1, ndi->randomid); 925 } 926 } 927 928 CURVNET_RESTORE(); 929} 930 931static void 932in6_purgemaddrs(struct ifnet *ifp) 933{ 934 LIST_HEAD(,in6_multi) purgeinms; 935 struct in6_multi *inm, *tinm; 936 struct ifmultiaddr *ifma; 937 938 LIST_INIT(&purgeinms); 939 IN6_MULTI_LOCK(); 940 941 /* 942 * Extract list of in6_multi associated with the detaching ifp 943 * which the PF_INET6 layer is about to release. 944 * We need to do this as IF_ADDR_LOCK() may be re-acquired 945 * by code further down. 946 */ 947 IF_ADDR_LOCK(ifp); 948 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 949 if (ifma->ifma_addr->sa_family != AF_INET6 || 950 ifma->ifma_protospec == NULL) 951 continue; 952 inm = (struct in6_multi *)ifma->ifma_protospec; 953 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 954 } 955 IF_ADDR_UNLOCK(ifp); 956 957 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 958 LIST_REMOVE(inm, in6m_entry); 959 in6m_release_locked(inm); 960 } 961 mld_ifdetach(ifp); 962 963 IN6_MULTI_UNLOCK(); 964} 965