in6_ifattach.c revision 191340
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 191340 2009-04-20 22:45:21Z rwatson $"); 34 35#include "opt_route.h" 36 37#include <sys/param.h> 38#include <sys/systm.h> 39#include <sys/malloc.h> 40#include <sys/socket.h> 41#include <sys/sockio.h> 42#include <sys/kernel.h> 43#include <sys/syslog.h> 44#include <sys/md5.h> 45#include <sys/vimage.h> 46 47#include <net/if.h> 48#include <net/if_dl.h> 49#include <net/if_types.h> 50#include <net/route.h> 51#include <net/vnet.h> 52 53#include <netinet/in.h> 54#include <netinet/in_var.h> 55#include <netinet/if_ether.h> 56#include <netinet/in_pcb.h> 57#include <netinet/vinet.h> 58 59#include <netinet/ip6.h> 60#include <netinet6/ip6_var.h> 61#include <netinet6/in6_var.h> 62#include <netinet6/in6_pcb.h> 63#include <netinet6/in6_ifattach.h> 64#include <netinet6/ip6_var.h> 65#include <netinet6/nd6.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 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */ 107 MD5_CTX ctxt; 108 u_int8_t digest[16]; 109 int hostnamelen; 110 111 mtx_lock(&hostname_mtx); 112 hostnamelen = strlen(V_hostname); 113#if 0 114 /* we need at least several letters as seed for ifid */ 115 if (hostnamelen < 3) 116 return -1; 117#endif 118 119 /* generate 8 bytes of pseudo-random value. */ 120 bzero(&ctxt, sizeof(ctxt)); 121 MD5Init(&ctxt); 122 MD5Update(&ctxt, V_hostname, hostnamelen); 123 mtx_unlock(&hostname_mtx); 124 MD5Final(digest, &ctxt); 125 126 /* assumes sizeof(digest) > sizeof(ifid) */ 127 bcopy(digest, &in6->s6_addr[8], 8); 128 129 /* make sure to set "u" bit to local, and "g" bit to individual. */ 130 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 131 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 132 133 /* convert EUI64 into IPv6 interface identifier */ 134 EUI64_TO_IFID(in6); 135 136 return 0; 137} 138 139static int 140generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 141{ 142 INIT_VNET_INET6(curvnet); 143 MD5_CTX ctxt; 144 u_int8_t seed[16], digest[16], nullbuf[8]; 145 u_int32_t val32; 146 147 /* If there's no history, start with a random seed. */ 148 bzero(nullbuf, sizeof(nullbuf)); 149 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 150 int i; 151 152 for (i = 0; i < 2; i++) { 153 val32 = arc4random(); 154 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 155 } 156 } else 157 bcopy(seed0, seed, 8); 158 159 /* copy the right-most 64-bits of the given address */ 160 /* XXX assumption on the size of IFID */ 161 bcopy(seed1, &seed[8], 8); 162 163 if (0) { /* for debugging purposes only */ 164 int i; 165 166 printf("generate_tmp_ifid: new randomized ID from: "); 167 for (i = 0; i < 16; i++) 168 printf("%02x", seed[i]); 169 printf(" "); 170 } 171 172 /* generate 16 bytes of pseudo-random value. */ 173 bzero(&ctxt, sizeof(ctxt)); 174 MD5Init(&ctxt); 175 MD5Update(&ctxt, seed, sizeof(seed)); 176 MD5Final(digest, &ctxt); 177 178 /* 179 * RFC 3041 3.2.1. (3) 180 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 181 * left-most bit is numbered 0) to zero. 182 */ 183 bcopy(digest, ret, 8); 184 ret[0] &= ~EUI64_UBIT; 185 186 /* 187 * XXX: we'd like to ensure that the generated value is not zero 188 * for simplicity. If the caclculated digest happens to be zero, 189 * use a random non-zero value as the last resort. 190 */ 191 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 192 nd6log((LOG_INFO, 193 "generate_tmp_ifid: computed MD5 value is zero.\n")); 194 195 val32 = arc4random(); 196 val32 = 1 + (val32 % (0xffffffff - 1)); 197 } 198 199 /* 200 * RFC 3041 3.2.1. (4) 201 * Take the rightmost 64-bits of the MD5 digest and save them in 202 * stable storage as the history value to be used in the next 203 * iteration of the algorithm. 204 */ 205 bcopy(&digest[8], seed0, 8); 206 207 if (0) { /* for debugging purposes only */ 208 int i; 209 210 printf("to: "); 211 for (i = 0; i < 16; i++) 212 printf("%02x", digest[i]); 213 printf("\n"); 214 } 215 216 return 0; 217} 218 219/* 220 * Get interface identifier for the specified interface. 221 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 222 * 223 * in6 - upper 64bits are preserved 224 */ 225int 226in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 227{ 228 struct ifaddr *ifa; 229 struct sockaddr_dl *sdl; 230 u_int8_t *addr; 231 size_t addrlen; 232 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 233 static u_int8_t allone[8] = 234 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 235 236 IF_ADDR_LOCK(ifp); 237 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 238 if (ifa->ifa_addr->sa_family != AF_LINK) 239 continue; 240 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 241 if (sdl == NULL) 242 continue; 243 if (sdl->sdl_alen == 0) 244 continue; 245 246 goto found; 247 } 248 IF_ADDR_UNLOCK(ifp); 249 250 return -1; 251 252found: 253 addr = LLADDR(sdl); 254 addrlen = sdl->sdl_alen; 255 256 /* get EUI64 */ 257 switch (ifp->if_type) { 258 case IFT_ETHER: 259 case IFT_FDDI: 260 case IFT_ISO88025: 261 case IFT_ATM: 262 case IFT_IEEE1394: 263#ifdef IFT_IEEE80211 264 case IFT_IEEE80211: 265#endif 266 /* IEEE802/EUI64 cases - what others? */ 267 /* IEEE1394 uses 16byte length address starting with EUI64 */ 268 if (addrlen > 8) 269 addrlen = 8; 270 271 /* look at IEEE802/EUI64 only */ 272 if (addrlen != 8 && addrlen != 6) { 273 IF_ADDR_UNLOCK(ifp); 274 return -1; 275 } 276 277 /* 278 * check for invalid MAC address - on bsdi, we see it a lot 279 * since wildboar configures all-zero MAC on pccard before 280 * card insertion. 281 */ 282 if (bcmp(addr, allzero, addrlen) == 0) { 283 IF_ADDR_UNLOCK(ifp); 284 return -1; 285 } 286 if (bcmp(addr, allone, addrlen) == 0) { 287 IF_ADDR_UNLOCK(ifp); 288 return -1; 289 } 290 291 /* make EUI64 address */ 292 if (addrlen == 8) 293 bcopy(addr, &in6->s6_addr[8], 8); 294 else if (addrlen == 6) { 295 in6->s6_addr[8] = addr[0]; 296 in6->s6_addr[9] = addr[1]; 297 in6->s6_addr[10] = addr[2]; 298 in6->s6_addr[11] = 0xff; 299 in6->s6_addr[12] = 0xfe; 300 in6->s6_addr[13] = addr[3]; 301 in6->s6_addr[14] = addr[4]; 302 in6->s6_addr[15] = addr[5]; 303 } 304 break; 305 306 case IFT_ARCNET: 307 if (addrlen != 1) { 308 IF_ADDR_UNLOCK(ifp); 309 return -1; 310 } 311 if (!addr[0]) { 312 IF_ADDR_UNLOCK(ifp); 313 return -1; 314 } 315 316 bzero(&in6->s6_addr[8], 8); 317 in6->s6_addr[15] = addr[0]; 318 319 /* 320 * due to insufficient bitwidth, we mark it local. 321 */ 322 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 323 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 324 break; 325 326 case IFT_GIF: 327#ifdef IFT_STF 328 case IFT_STF: 329#endif 330 /* 331 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 332 * however, IPv4 address is not very suitable as unique 333 * identifier source (can be renumbered). 334 * we don't do this. 335 */ 336 IF_ADDR_UNLOCK(ifp); 337 return -1; 338 339 default: 340 IF_ADDR_UNLOCK(ifp); 341 return -1; 342 } 343 344 /* sanity check: g bit must not indicate "group" */ 345 if (EUI64_GROUP(in6)) { 346 IF_ADDR_UNLOCK(ifp); 347 return -1; 348 } 349 350 /* convert EUI64 into IPv6 interface identifier */ 351 EUI64_TO_IFID(in6); 352 353 /* 354 * sanity check: ifid must not be all zero, avoid conflict with 355 * subnet router anycast 356 */ 357 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 358 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 359 IF_ADDR_UNLOCK(ifp); 360 return -1; 361 } 362 363 IF_ADDR_UNLOCK(ifp); 364 return 0; 365} 366 367/* 368 * Get interface identifier for the specified interface. If it is not 369 * available on ifp0, borrow interface identifier from other information 370 * sources. 371 * 372 * altifp - secondary EUI64 source 373 */ 374static int 375get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 376 struct in6_addr *in6) 377{ 378 INIT_VNET_NET(ifp0->if_vnet); 379 INIT_VNET_INET6(ifp0->if_vnet); 380 struct ifnet *ifp; 381 382 /* first, try to get it from the interface itself */ 383 if (in6_get_hw_ifid(ifp0, in6) == 0) { 384 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 385 if_name(ifp0))); 386 goto success; 387 } 388 389 /* try secondary EUI64 source. this basically is for ATM PVC */ 390 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 391 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 392 if_name(ifp0), if_name(altifp))); 393 goto success; 394 } 395 396 /* next, try to get it from some other hardware interface */ 397 IFNET_RLOCK(); 398 for (ifp = V_ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) { 399 if (ifp == ifp0) 400 continue; 401 if (in6_get_hw_ifid(ifp, in6) != 0) 402 continue; 403 404 /* 405 * to borrow ifid from other interface, ifid needs to be 406 * globally unique 407 */ 408 if (IFID_UNIVERSAL(in6)) { 409 nd6log((LOG_DEBUG, 410 "%s: borrow interface identifier from %s\n", 411 if_name(ifp0), if_name(ifp))); 412 IFNET_RUNLOCK(); 413 goto success; 414 } 415 } 416 IFNET_RUNLOCK(); 417 418 /* last resort: get from random number source */ 419 if (get_rand_ifid(ifp, in6) == 0) { 420 nd6log((LOG_DEBUG, 421 "%s: interface identifier generated by random number\n", 422 if_name(ifp0))); 423 goto success; 424 } 425 426 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 427 return -1; 428 429success: 430 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 431 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 432 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 433 in6->s6_addr[14], in6->s6_addr[15])); 434 return 0; 435} 436 437/* 438 * altifp - secondary EUI64 source 439 */ 440static int 441in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 442{ 443 INIT_VNET_INET6(curvnet); 444 struct in6_ifaddr *ia; 445 struct in6_aliasreq ifra; 446 struct nd_prefixctl pr0; 447 int i, error; 448 449 /* 450 * configure link-local address. 451 */ 452 bzero(&ifra, sizeof(ifra)); 453 454 /* 455 * in6_update_ifa() does not use ifra_name, but we accurately set it 456 * for safety. 457 */ 458 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 459 460 ifra.ifra_addr.sin6_family = AF_INET6; 461 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 462 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 463 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 464 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 465 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 466 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 467 } else { 468 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 469 nd6log((LOG_ERR, 470 "%s: no ifid available\n", if_name(ifp))); 471 return (-1); 472 } 473 } 474 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 475 return (-1); 476 477 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 478 ifra.ifra_prefixmask.sin6_family = AF_INET6; 479 ifra.ifra_prefixmask.sin6_addr = in6mask64; 480 /* link-local addresses should NEVER expire. */ 481 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 482 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 483 484 /* 485 * Now call in6_update_ifa() to do a bunch of procedures to configure 486 * a link-local address. We can set the 3rd argument to NULL, because 487 * we know there's no other link-local address on the interface 488 * and therefore we are adding one (instead of updating one). 489 */ 490 if ((error = in6_update_ifa(ifp, &ifra, NULL, 491 IN6_IFAUPDATE_DADDELAY)) != 0) { 492 /* 493 * XXX: When the interface does not support IPv6, this call 494 * would fail in the SIOCSIFADDR ioctl. I believe the 495 * notification is rather confusing in this case, so just 496 * suppress it. (jinmei@kame.net 20010130) 497 */ 498 if (error != EAFNOSUPPORT) 499 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 500 "configure a link-local address on %s " 501 "(errno=%d)\n", 502 if_name(ifp), error)); 503 return (-1); 504 } 505 506 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 507#ifdef DIAGNOSTIC 508 if (!ia) { 509 panic("ia == NULL in in6_ifattach_linklocal"); 510 /* NOTREACHED */ 511 } 512#endif 513 514 /* 515 * Make the link-local prefix (fe80::%link/64) as on-link. 516 * Since we'd like to manage prefixes separately from addresses, 517 * we make an ND6 prefix structure for the link-local prefix, 518 * and add it to the prefix list as a never-expire prefix. 519 * XXX: this change might affect some existing code base... 520 */ 521 bzero(&pr0, sizeof(pr0)); 522 pr0.ndpr_ifp = ifp; 523 /* this should be 64 at this moment. */ 524 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 525 pr0.ndpr_prefix = ifra.ifra_addr; 526 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 527 for (i = 0; i < 4; i++) { 528 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 529 in6mask64.s6_addr32[i]; 530 } 531 /* 532 * Initialize parameters. The link-local prefix must always be 533 * on-link, and its lifetimes never expire. 534 */ 535 pr0.ndpr_raf_onlink = 1; 536 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 537 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 538 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 539 /* 540 * Since there is no other link-local addresses, nd6_prefix_lookup() 541 * probably returns NULL. However, we cannot always expect the result. 542 * For example, if we first remove the (only) existing link-local 543 * address, and then reconfigure another one, the prefix is still 544 * valid with referring to the old link-local address. 545 */ 546 if (nd6_prefix_lookup(&pr0) == NULL) { 547 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 548 return (error); 549 } 550 551 return 0; 552} 553 554/* 555 * ifp - must be IFT_LOOP 556 */ 557static int 558in6_ifattach_loopback(struct ifnet *ifp) 559{ 560 INIT_VNET_INET6(curvnet); 561 struct in6_aliasreq ifra; 562 int error; 563 564 bzero(&ifra, sizeof(ifra)); 565 566 /* 567 * in6_update_ifa() does not use ifra_name, but we accurately set it 568 * for safety. 569 */ 570 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 571 572 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 573 ifra.ifra_prefixmask.sin6_family = AF_INET6; 574 ifra.ifra_prefixmask.sin6_addr = in6mask128; 575 576 /* 577 * Always initialize ia_dstaddr (= broadcast address) to loopback 578 * address. Follows IPv4 practice - see in_ifinit(). 579 */ 580 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 581 ifra.ifra_dstaddr.sin6_family = AF_INET6; 582 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 583 584 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 585 ifra.ifra_addr.sin6_family = AF_INET6; 586 ifra.ifra_addr.sin6_addr = in6addr_loopback; 587 588 /* the loopback address should NEVER expire. */ 589 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 590 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 591 592 /* we don't need to perform DAD on loopback interfaces. */ 593 ifra.ifra_flags |= IN6_IFF_NODAD; 594 595 /* skip registration to the prefix list. XXX should be temporary. */ 596 ifra.ifra_flags |= IN6_IFF_NOPFX; 597 598 /* 599 * We are sure that this is a newly assigned address, so we can set 600 * NULL to the 3rd arg. 601 */ 602 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 603 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 604 "the loopback address on %s (errno=%d)\n", 605 if_name(ifp), error)); 606 return (-1); 607 } 608 609 return 0; 610} 611 612/* 613 * compute NI group address, based on the current hostname setting. 614 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later). 615 * 616 * when ifp == NULL, the caller is responsible for filling scopeid. 617 */ 618int 619in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 620 struct in6_addr *in6) 621{ 622 const char *p; 623 u_char *q; 624 MD5_CTX ctxt; 625 u_int8_t digest[16]; 626 char l; 627 char n[64]; /* a single label must not exceed 63 chars */ 628 629 if (!namelen || !name) 630 return -1; 631 632 p = name; 633 while (p && *p && *p != '.' && p - name < namelen) 634 p++; 635 if (p - name > sizeof(n) - 1) 636 return -1; /* label too long */ 637 l = p - name; 638 strncpy(n, name, l); 639 n[(int)l] = '\0'; 640 for (q = n; *q; q++) { 641 if ('A' <= *q && *q <= 'Z') 642 *q = *q - 'A' + 'a'; 643 } 644 645 /* generate 8 bytes of pseudo-random value. */ 646 bzero(&ctxt, sizeof(ctxt)); 647 MD5Init(&ctxt); 648 MD5Update(&ctxt, &l, sizeof(l)); 649 MD5Update(&ctxt, n, l); 650 MD5Final(digest, &ctxt); 651 652 bzero(in6, sizeof(*in6)); 653 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 654 in6->s6_addr8[11] = 2; 655 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 656 if (in6_setscope(in6, ifp, NULL)) 657 return (-1); /* XXX: should not fail */ 658 659 return 0; 660} 661 662/* 663 * XXX multiple loopback interface needs more care. for instance, 664 * nodelocal address needs to be configured onto only one of them. 665 * XXX multiple link-local address case 666 * 667 * altifp - secondary EUI64 source 668 */ 669void 670in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 671{ 672 INIT_VNET_INET6(ifp->if_vnet); 673 struct in6_ifaddr *ia; 674 struct in6_addr in6; 675 676 /* some of the interfaces are inherently not IPv6 capable */ 677 switch (ifp->if_type) { 678 case IFT_PFLOG: 679 case IFT_PFSYNC: 680 case IFT_CARP: 681 return; 682 } 683 684 /* 685 * quirks based on interface type 686 */ 687 switch (ifp->if_type) { 688#ifdef IFT_STF 689 case IFT_STF: 690 /* 691 * 6to4 interface is a very special kind of beast. 692 * no multicast, no linklocal. RFC2529 specifies how to make 693 * linklocals for 6to4 interface, but there's no use and 694 * it is rather harmful to have one. 695 */ 696 goto statinit; 697#endif 698 default: 699 break; 700 } 701 702 /* 703 * usually, we require multicast capability to the interface 704 */ 705 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 706 nd6log((LOG_INFO, "in6_ifattach: " 707 "%s is not multicast capable, IPv6 not enabled\n", 708 if_name(ifp))); 709 return; 710 } 711 712 /* 713 * assign loopback address for loopback interface. 714 * XXX multiple loopback interface case. 715 */ 716 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 717 in6 = in6addr_loopback; 718 if (in6ifa_ifpwithaddr(ifp, &in6) == NULL) { 719 if (in6_ifattach_loopback(ifp) != 0) 720 return; 721 } 722 } 723 724 /* 725 * assign a link-local address, if there's none. 726 */ 727 if (V_ip6_auto_linklocal && ifp->if_type != IFT_BRIDGE) { 728 ia = in6ifa_ifpforlinklocal(ifp, 0); 729 if (ia == NULL) { 730 if (in6_ifattach_linklocal(ifp, altifp) == 0) { 731 /* linklocal address assigned */ 732 } else { 733 /* failed to assign linklocal address. bark? */ 734 } 735 } 736 } 737 738#ifdef IFT_STF /* XXX */ 739statinit: 740#endif 741 742 /* update dynamically. */ 743 if (V_in6_maxmtu < ifp->if_mtu) 744 V_in6_maxmtu = ifp->if_mtu; 745} 746 747/* 748 * NOTE: in6_ifdetach() does not support loopback if at this moment. 749 * We don't need this function in bsdi, because interfaces are never removed 750 * from the ifnet list in bsdi. 751 */ 752void 753in6_ifdetach(struct ifnet *ifp) 754{ 755 INIT_VNET_NET(ifp->if_vnet); 756 INIT_VNET_INET(ifp->if_vnet); 757 INIT_VNET_INET6(ifp->if_vnet); 758 struct in6_ifaddr *ia, *oia; 759 struct ifaddr *ifa, *next; 760 struct rtentry *rt; 761 short rtflags; 762 struct sockaddr_in6 sin6; 763 struct in6_multi_mship *imm; 764 765 /* remove neighbor management table */ 766 nd6_purge(ifp); 767 768 /* nuke any of IPv6 addresses we have */ 769 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 770 if (ifa->ifa_addr->sa_family != AF_INET6) 771 continue; 772 in6_purgeaddr(ifa); 773 } 774 775 /* undo everything done by in6_ifattach(), just in case */ 776 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 777 if (ifa->ifa_addr->sa_family != AF_INET6 778 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 779 continue; 780 } 781 782 ia = (struct in6_ifaddr *)ifa; 783 784 /* 785 * leave from multicast groups we have joined for the interface 786 */ 787 while ((imm = ia->ia6_memberships.lh_first) != NULL) { 788 LIST_REMOVE(imm, i6mm_chain); 789 in6_leavegroup(imm); 790 } 791 792 /* remove from the routing table */ 793 if ((ia->ia_flags & IFA_ROUTE) && 794 (rt = rtalloc1((struct sockaddr *)&ia->ia_addr, 0, 0UL))) { 795 rtflags = rt->rt_flags; 796 RTFREE_LOCKED(rt); 797 rtrequest(RTM_DELETE, (struct sockaddr *)&ia->ia_addr, 798 (struct sockaddr *)&ia->ia_addr, 799 (struct sockaddr *)&ia->ia_prefixmask, 800 rtflags, (struct rtentry **)0); 801 } 802 803 /* remove from the linked list */ 804 IF_ADDR_LOCK(ifp); 805 TAILQ_REMOVE(&ifp->if_addrhead, (struct ifaddr *)ia, ifa_link); 806 IF_ADDR_UNLOCK(ifp); 807 IFAFREE(&ia->ia_ifa); 808 809 /* also remove from the IPv6 address chain(itojun&jinmei) */ 810 oia = ia; 811 if (oia == (ia = V_in6_ifaddr)) 812 V_in6_ifaddr = ia->ia_next; 813 else { 814 while (ia->ia_next && (ia->ia_next != oia)) 815 ia = ia->ia_next; 816 if (ia->ia_next) 817 ia->ia_next = oia->ia_next; 818 else { 819 nd6log((LOG_ERR, 820 "%s: didn't unlink in6ifaddr from list\n", 821 if_name(ifp))); 822 } 823 } 824 825 IFAFREE(&oia->ia_ifa); 826 } 827 828 in6_pcbpurgeif0(&V_udbinfo, ifp); 829 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 830 /* leave from all multicast groups joined */ 831 in6_purgemaddrs(ifp); 832 833 /* 834 * remove neighbor management table. we call it twice just to make 835 * sure we nuke everything. maybe we need just one call. 836 * XXX: since the first call did not release addresses, some prefixes 837 * might remain. We should call nd6_purge() again to release the 838 * prefixes after removing all addresses above. 839 * (Or can we just delay calling nd6_purge until at this point?) 840 */ 841 nd6_purge(ifp); 842 843 /* remove route to link-local allnodes multicast (ff02::1) */ 844 bzero(&sin6, sizeof(sin6)); 845 sin6.sin6_len = sizeof(struct sockaddr_in6); 846 sin6.sin6_family = AF_INET6; 847 sin6.sin6_addr = in6addr_linklocal_allnodes; 848 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 849 /* XXX: should not fail */ 850 return; 851 /* XXX grab lock first to avoid LOR */ 852 if (V_rt_tables[0][AF_INET6] != NULL) { 853 RADIX_NODE_HEAD_LOCK(V_rt_tables[0][AF_INET6]); 854 rt = rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED); 855 if (rt) { 856 if (rt->rt_ifp == ifp) 857 rtexpunge(rt); 858 RTFREE_LOCKED(rt); 859 } 860 RADIX_NODE_HEAD_UNLOCK(V_rt_tables[0][AF_INET6]); 861 } 862} 863 864int 865in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 866 const u_int8_t *baseid, int generate) 867{ 868 u_int8_t nullbuf[8]; 869 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 870 871 bzero(nullbuf, sizeof(nullbuf)); 872 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 873 /* we've never created a random ID. Create a new one. */ 874 generate = 1; 875 } 876 877 if (generate) { 878 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 879 880 /* generate_tmp_ifid will update seedn and buf */ 881 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 882 ndi->randomid); 883 } 884 bcopy(ndi->randomid, retbuf, 8); 885 886 return (0); 887} 888 889void 890in6_tmpaddrtimer(void *ignored_arg) 891{ 892 INIT_VNET_NET(curvnet); 893 INIT_VNET_INET6(curvnet); 894 struct nd_ifinfo *ndi; 895 u_int8_t nullbuf[8]; 896 struct ifnet *ifp; 897 898 callout_reset(&V_in6_tmpaddrtimer_ch, 899 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 900 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, NULL); 901 902 bzero(nullbuf, sizeof(nullbuf)); 903 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; 904 ifp = TAILQ_NEXT(ifp, if_list)) { 905 ndi = ND_IFINFO(ifp); 906 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 907 /* 908 * We've been generating a random ID on this interface. 909 * Create a new one. 910 */ 911 (void)generate_tmp_ifid(ndi->randomseed0, 912 ndi->randomseed1, ndi->randomid); 913 } 914 } 915 916} 917 918static void 919in6_purgemaddrs(struct ifnet *ifp) 920{ 921 struct in6_multi *in6m; 922 struct in6_multi *oin6m; 923 924 LIST_FOREACH_SAFE(in6m, &in6_multihead, in6m_entry, oin6m) { 925 if (in6m->in6m_ifp == ifp) 926 in6_delmulti(in6m); 927 } 928} 929