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("$FreeBSD$"); 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_RLOCK(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_RUNLOCK(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_BRIDGE: 270 case IFT_ETHER: 271 case IFT_L2VLAN: 272 case IFT_FDDI: 273 case IFT_ISO88025: 274 case IFT_ATM: 275 case IFT_IEEE1394: 276#ifdef IFT_IEEE80211 277 case IFT_IEEE80211: 278#endif 279 /* IEEE802/EUI64 cases - what others? */ 280 /* IEEE1394 uses 16byte length address starting with EUI64 */ 281 if (addrlen > 8) 282 addrlen = 8; 283 284 /* look at IEEE802/EUI64 only */ 285 if (addrlen != 8 && addrlen != 6) { 286 IF_ADDR_RUNLOCK(ifp); 287 return -1; 288 } 289 290 /* 291 * check for invalid MAC address - on bsdi, we see it a lot 292 * since wildboar configures all-zero MAC on pccard before 293 * card insertion. 294 */ 295 if (bcmp(addr, allzero, addrlen) == 0) { 296 IF_ADDR_RUNLOCK(ifp); 297 return -1; 298 } 299 if (bcmp(addr, allone, addrlen) == 0) { 300 IF_ADDR_RUNLOCK(ifp); 301 return -1; 302 } 303 304 /* make EUI64 address */ 305 if (addrlen == 8) 306 bcopy(addr, &in6->s6_addr[8], 8); 307 else if (addrlen == 6) { 308 in6->s6_addr[8] = addr[0]; 309 in6->s6_addr[9] = addr[1]; 310 in6->s6_addr[10] = addr[2]; 311 in6->s6_addr[11] = 0xff; 312 in6->s6_addr[12] = 0xfe; 313 in6->s6_addr[13] = addr[3]; 314 in6->s6_addr[14] = addr[4]; 315 in6->s6_addr[15] = addr[5]; 316 } 317 break; 318 319 case IFT_ARCNET: 320 if (addrlen != 1) { 321 IF_ADDR_RUNLOCK(ifp); 322 return -1; 323 } 324 if (!addr[0]) { 325 IF_ADDR_RUNLOCK(ifp); 326 return -1; 327 } 328 329 bzero(&in6->s6_addr[8], 8); 330 in6->s6_addr[15] = addr[0]; 331 332 /* 333 * due to insufficient bitwidth, we mark it local. 334 */ 335 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 336 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 337 break; 338 339 case IFT_GIF: 340#ifdef IFT_STF 341 case IFT_STF: 342#endif 343 /* 344 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 345 * however, IPv4 address is not very suitable as unique 346 * identifier source (can be renumbered). 347 * we don't do this. 348 */ 349 IF_ADDR_RUNLOCK(ifp); 350 return -1; 351 352 default: 353 IF_ADDR_RUNLOCK(ifp); 354 return -1; 355 } 356 357 /* sanity check: g bit must not indicate "group" */ 358 if (EUI64_GROUP(in6)) { 359 IF_ADDR_RUNLOCK(ifp); 360 return -1; 361 } 362 363 /* convert EUI64 into IPv6 interface identifier */ 364 EUI64_TO_IFID(in6); 365 366 /* 367 * sanity check: ifid must not be all zero, avoid conflict with 368 * subnet router anycast 369 */ 370 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 371 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 372 IF_ADDR_RUNLOCK(ifp); 373 return -1; 374 } 375 376 IF_ADDR_RUNLOCK(ifp); 377 return 0; 378} 379 380/* 381 * Get interface identifier for the specified interface. If it is not 382 * available on ifp0, borrow interface identifier from other information 383 * sources. 384 * 385 * altifp - secondary EUI64 source 386 */ 387static int 388get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 389 struct in6_addr *in6) 390{ 391 struct ifnet *ifp; 392 393 /* first, try to get it from the interface itself */ 394 if (in6_get_hw_ifid(ifp0, in6) == 0) { 395 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 396 if_name(ifp0))); 397 goto success; 398 } 399 400 /* try secondary EUI64 source. this basically is for ATM PVC */ 401 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 402 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 403 if_name(ifp0), if_name(altifp))); 404 goto success; 405 } 406 407 /* next, try to get it from some other hardware interface */ 408 IFNET_RLOCK_NOSLEEP(); 409 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 410 if (ifp == ifp0) 411 continue; 412 if (in6_get_hw_ifid(ifp, in6) != 0) 413 continue; 414 415 /* 416 * to borrow ifid from other interface, ifid needs to be 417 * globally unique 418 */ 419 if (IFID_UNIVERSAL(in6)) { 420 nd6log((LOG_DEBUG, 421 "%s: borrow interface identifier from %s\n", 422 if_name(ifp0), if_name(ifp))); 423 IFNET_RUNLOCK_NOSLEEP(); 424 goto success; 425 } 426 } 427 IFNET_RUNLOCK_NOSLEEP(); 428 429 /* last resort: get from random number source */ 430 if (get_rand_ifid(ifp, in6) == 0) { 431 nd6log((LOG_DEBUG, 432 "%s: interface identifier generated by random number\n", 433 if_name(ifp0))); 434 goto success; 435 } 436 437 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 438 return -1; 439 440success: 441 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 442 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 443 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 444 in6->s6_addr[14], in6->s6_addr[15])); 445 return 0; 446} 447 448/* 449 * altifp - secondary EUI64 source 450 */ 451static int 452in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 453{ 454 struct in6_ifaddr *ia; 455 struct in6_aliasreq ifra; 456 struct nd_prefixctl pr0; 457 int i, error; 458 459 /* 460 * configure link-local address. 461 */ 462 bzero(&ifra, sizeof(ifra)); 463 464 /* 465 * in6_update_ifa() does not use ifra_name, but we accurately set it 466 * for safety. 467 */ 468 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 469 470 ifra.ifra_addr.sin6_family = AF_INET6; 471 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 472 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 473 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 474 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 475 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 476 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 477 } else { 478 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 479 nd6log((LOG_ERR, 480 "%s: no ifid available\n", if_name(ifp))); 481 return (-1); 482 } 483 } 484 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 485 return (-1); 486 487 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 488 ifra.ifra_prefixmask.sin6_family = AF_INET6; 489 ifra.ifra_prefixmask.sin6_addr = in6mask64; 490 /* link-local addresses should NEVER expire. */ 491 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 492 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 493 494 /* 495 * Now call in6_update_ifa() to do a bunch of procedures to configure 496 * a link-local address. We can set the 3rd argument to NULL, because 497 * we know there's no other link-local address on the interface 498 * and therefore we are adding one (instead of updating one). 499 */ 500 if ((error = in6_update_ifa(ifp, &ifra, NULL, 501 IN6_IFAUPDATE_DADDELAY)) != 0) { 502 /* 503 * XXX: When the interface does not support IPv6, this call 504 * would fail in the SIOCSIFADDR ioctl. I believe the 505 * notification is rather confusing in this case, so just 506 * suppress it. (jinmei@kame.net 20010130) 507 */ 508 if (error != EAFNOSUPPORT) 509 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 510 "configure a link-local address on %s " 511 "(errno=%d)\n", 512 if_name(ifp), error)); 513 return (-1); 514 } 515 516 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 517 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 518 519 ifa_free(&ia->ia_ifa); 520 521 /* 522 * Make the link-local prefix (fe80::%link/64) as on-link. 523 * Since we'd like to manage prefixes separately from addresses, 524 * we make an ND6 prefix structure for the link-local prefix, 525 * and add it to the prefix list as a never-expire prefix. 526 * XXX: this change might affect some existing code base... 527 */ 528 bzero(&pr0, sizeof(pr0)); 529 pr0.ndpr_ifp = ifp; 530 /* this should be 64 at this moment. */ 531 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 532 pr0.ndpr_prefix = ifra.ifra_addr; 533 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 534 for (i = 0; i < 4; i++) { 535 pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &= 536 in6mask64.s6_addr32[i]; 537 } 538 /* 539 * Initialize parameters. The link-local prefix must always be 540 * on-link, and its lifetimes never expire. 541 */ 542 pr0.ndpr_raf_onlink = 1; 543 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 544 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 545 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 546 /* 547 * Since there is no other link-local addresses, nd6_prefix_lookup() 548 * probably returns NULL. However, we cannot always expect the result. 549 * For example, if we first remove the (only) existing link-local 550 * address, and then reconfigure another one, the prefix is still 551 * valid with referring to the old link-local address. 552 */ 553 if (nd6_prefix_lookup(&pr0) == NULL) { 554 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 555 return (error); 556 } 557 558 return 0; 559} 560 561/* 562 * ifp - must be IFT_LOOP 563 */ 564static int 565in6_ifattach_loopback(struct ifnet *ifp) 566{ 567 struct in6_aliasreq ifra; 568 int error; 569 570 bzero(&ifra, sizeof(ifra)); 571 572 /* 573 * in6_update_ifa() does not use ifra_name, but we accurately set it 574 * for safety. 575 */ 576 strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name)); 577 578 ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6); 579 ifra.ifra_prefixmask.sin6_family = AF_INET6; 580 ifra.ifra_prefixmask.sin6_addr = in6mask128; 581 582 /* 583 * Always initialize ia_dstaddr (= broadcast address) to loopback 584 * address. Follows IPv4 practice - see in_ifinit(). 585 */ 586 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 587 ifra.ifra_dstaddr.sin6_family = AF_INET6; 588 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 589 590 ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6); 591 ifra.ifra_addr.sin6_family = AF_INET6; 592 ifra.ifra_addr.sin6_addr = in6addr_loopback; 593 594 /* the loopback address should NEVER expire. */ 595 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 596 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 597 598 /* we don't need to perform DAD on loopback interfaces. */ 599 ifra.ifra_flags |= IN6_IFF_NODAD; 600 601 /* skip registration to the prefix list. XXX should be temporary. */ 602 ifra.ifra_flags |= IN6_IFF_NOPFX; 603 604 /* 605 * We are sure that this is a newly assigned address, so we can set 606 * NULL to the 3rd arg. 607 */ 608 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 609 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 610 "the loopback address on %s (errno=%d)\n", 611 if_name(ifp), error)); 612 return (-1); 613 } 614 615 return 0; 616} 617 618/* 619 * compute NI group address, based on the current hostname setting. 620 * see RFC 4620. 621 * 622 * when ifp == NULL, the caller is responsible for filling scopeid. 623 * 624 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 625 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 626 */ 627static int 628in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 629 struct in6_addr *in6, int oldmcprefix) 630{ 631 struct prison *pr; 632 const char *p; 633 u_char *q; 634 MD5_CTX ctxt; 635 u_int8_t digest[16]; 636 char l; 637 char n[64]; /* a single label must not exceed 63 chars */ 638 639 /* 640 * If no name is given and namelen is -1, 641 * we try to do the hostname lookup ourselves. 642 */ 643 if (!name && namelen == -1) { 644 pr = curthread->td_ucred->cr_prison; 645 mtx_lock(&pr->pr_mtx); 646 name = pr->pr_hostname; 647 namelen = strlen(name); 648 } else 649 pr = NULL; 650 if (!name || !namelen) { 651 if (pr != NULL) 652 mtx_unlock(&pr->pr_mtx); 653 return -1; 654 } 655 656 p = name; 657 while (p && *p && *p != '.' && p - name < namelen) 658 p++; 659 if (p == name || p - name > sizeof(n) - 1) { 660 if (pr != NULL) 661 mtx_unlock(&pr->pr_mtx); 662 return -1; /* label too long */ 663 } 664 l = p - name; 665 strncpy(n, name, l); 666 if (pr != NULL) 667 mtx_unlock(&pr->pr_mtx); 668 n[(int)l] = '\0'; 669 for (q = n; *q; q++) { 670 if ('A' <= *q && *q <= 'Z') 671 *q = *q - 'A' + 'a'; 672 } 673 674 /* generate 16 bytes of pseudo-random value. */ 675 bzero(&ctxt, sizeof(ctxt)); 676 MD5Init(&ctxt); 677 MD5Update(&ctxt, &l, sizeof(l)); 678 MD5Update(&ctxt, n, l); 679 MD5Final(digest, &ctxt); 680 681 bzero(in6, sizeof(*in6)); 682 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 683 in6->s6_addr8[11] = 2; 684 if (oldmcprefix == 0) { 685 in6->s6_addr8[12] = 0xff; 686 /* Copy the first 24 bits of 128-bit hash into the address. */ 687 bcopy(digest, &in6->s6_addr8[13], 3); 688 } else { 689 /* Copy the first 32 bits of 128-bit hash into the address. */ 690 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 691 } 692 if (in6_setscope(in6, ifp, NULL)) 693 return (-1); /* XXX: should not fail */ 694 695 return 0; 696} 697 698int 699in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 700 struct in6_addr *in6) 701{ 702 703 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 704} 705 706int 707in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 708 struct in6_addr *in6) 709{ 710 711 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 712} 713 714/* 715 * XXX multiple loopback interface needs more care. for instance, 716 * nodelocal address needs to be configured onto only one of them. 717 * XXX multiple link-local address case 718 * 719 * altifp - secondary EUI64 source 720 */ 721void 722in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 723{ 724 struct in6_ifaddr *ia; 725 struct in6_addr in6; 726 727 if (ifp->if_afdata[AF_INET6] == NULL) 728 return; 729 /* 730 * quirks based on interface type 731 */ 732 switch (ifp->if_type) { 733 case IFT_STF: 734 /* 735 * 6to4 interface is a very special kind of beast. 736 * no multicast, no linklocal. RFC2529 specifies how to make 737 * linklocals for 6to4 interface, but there's no use and 738 * it is rather harmful to have one. 739 */ 740 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 741 break; 742 default: 743 break; 744 } 745 746 /* 747 * usually, we require multicast capability to the interface 748 */ 749 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 750 nd6log((LOG_INFO, "in6_ifattach: " 751 "%s is not multicast capable, IPv6 not enabled\n", 752 if_name(ifp))); 753 return; 754 } 755 756 /* 757 * assign loopback address for loopback interface. 758 * XXX multiple loopback interface case. 759 */ 760 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 761 struct ifaddr *ifa; 762 763 in6 = in6addr_loopback; 764 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 765 if (ifa == NULL) { 766 if (in6_ifattach_loopback(ifp) != 0) 767 return; 768 } else 769 ifa_free(ifa); 770 } 771 772 /* 773 * assign a link-local address, if there's none. 774 */ 775 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 776 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 777 int error; 778 779 ia = in6ifa_ifpforlinklocal(ifp, 0); 780 if (ia == NULL) { 781 error = in6_ifattach_linklocal(ifp, altifp); 782#if 0 783 if (error) 784 log(LOG_NOTICE, "in6_ifattach_linklocal: " 785 "failed to add a link-local addr to %s\n", 786 if_name(ifp)); 787#endif 788 } else 789 ifa_free(&ia->ia_ifa); 790 } 791 792 /* update dynamically. */ 793 if (V_in6_maxmtu < ifp->if_mtu) 794 V_in6_maxmtu = ifp->if_mtu; 795} 796 797/* 798 * NOTE: in6_ifdetach() does not support loopback if at this moment. 799 * We don't need this function in bsdi, because interfaces are never removed 800 * from the ifnet list in bsdi. 801 */ 802void 803in6_ifdetach(struct ifnet *ifp) 804{ 805 struct in6_ifaddr *ia; 806 struct ifaddr *ifa, *next; 807 struct radix_node_head *rnh; 808 struct rtentry *rt; 809 struct sockaddr_in6 sin6; 810 struct in6_multi_mship *imm; 811 812 if (ifp->if_afdata[AF_INET6] == NULL) 813 return; 814 815 /* remove neighbor management table */ 816 nd6_purge(ifp); 817 818 /* nuke any of IPv6 addresses we have */ 819 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 820 if (ifa->ifa_addr->sa_family != AF_INET6) 821 continue; 822 in6_purgeaddr(ifa); 823 } 824 825 /* undo everything done by in6_ifattach(), just in case */ 826 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 827 if (ifa->ifa_addr->sa_family != AF_INET6 828 || !IN6_IS_ADDR_LINKLOCAL(&satosin6(&ifa->ifa_addr)->sin6_addr)) { 829 continue; 830 } 831 832 ia = (struct in6_ifaddr *)ifa; 833 834 /* 835 * leave from multicast groups we have joined for the interface 836 */ 837 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) { 838 LIST_REMOVE(imm, i6mm_chain); 839 in6_leavegroup(imm); 840 } 841 842 /* Remove link-local from the routing table. */ 843 if (ia->ia_flags & IFA_ROUTE) 844 (void)rtinit(&ia->ia_ifa, RTM_DELETE, ia->ia_flags); 845 846 /* remove from the linked list */ 847 IF_ADDR_WLOCK(ifp); 848 TAILQ_REMOVE(&ifp->if_addrhead, ifa, ifa_link); 849 IF_ADDR_WUNLOCK(ifp); 850 ifa_free(ifa); /* if_addrhead */ 851 852 IN6_IFADDR_WLOCK(); 853 TAILQ_REMOVE(&V_in6_ifaddrhead, ia, ia_link); 854 IN6_IFADDR_WUNLOCK(); 855 ifa_free(ifa); 856 } 857 858 in6_pcbpurgeif0(&V_udbinfo, ifp); 859 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 860 /* leave from all multicast groups joined */ 861 in6_purgemaddrs(ifp); 862 863 /* 864 * remove neighbor management table. we call it twice just to make 865 * sure we nuke everything. maybe we need just one call. 866 * XXX: since the first call did not release addresses, some prefixes 867 * might remain. We should call nd6_purge() again to release the 868 * prefixes after removing all addresses above. 869 * (Or can we just delay calling nd6_purge until at this point?) 870 */ 871 nd6_purge(ifp); 872 873 /* 874 * Remove route to link-local allnodes multicast (ff02::1). 875 * These only get automatically installed for the default FIB. 876 */ 877 bzero(&sin6, sizeof(sin6)); 878 sin6.sin6_len = sizeof(struct sockaddr_in6); 879 sin6.sin6_family = AF_INET6; 880 sin6.sin6_addr = in6addr_linklocal_allnodes; 881 if (in6_setscope(&sin6.sin6_addr, ifp, NULL)) 882 /* XXX: should not fail */ 883 return; 884 /* XXX grab lock first to avoid LOR */ 885 rnh = rt_tables_get_rnh(RT_DEFAULT_FIB, AF_INET6); 886 if (rnh != NULL) { 887 RADIX_NODE_HEAD_LOCK(rnh); 888 rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, RTF_RNH_LOCKED, 889 RT_DEFAULT_FIB); 890 if (rt) { 891 if (rt->rt_ifp == ifp) 892 rtexpunge(rt); 893 RTFREE_LOCKED(rt); 894 } 895 RADIX_NODE_HEAD_UNLOCK(rnh); 896 } 897} 898 899int 900in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 901 const u_int8_t *baseid, int generate) 902{ 903 u_int8_t nullbuf[8]; 904 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 905 906 bzero(nullbuf, sizeof(nullbuf)); 907 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 908 /* we've never created a random ID. Create a new one. */ 909 generate = 1; 910 } 911 912 if (generate) { 913 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 914 915 /* generate_tmp_ifid will update seedn and buf */ 916 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 917 ndi->randomid); 918 } 919 bcopy(ndi->randomid, retbuf, 8); 920 921 return (0); 922} 923 924void 925in6_tmpaddrtimer(void *arg) 926{ 927 CURVNET_SET((struct vnet *) arg); 928 struct nd_ifinfo *ndi; 929 u_int8_t nullbuf[8]; 930 struct ifnet *ifp; 931 932 callout_reset(&V_in6_tmpaddrtimer_ch, 933 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 934 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 935 936 bzero(nullbuf, sizeof(nullbuf)); 937 TAILQ_FOREACH(ifp, &V_ifnet, if_list) { 938 if (ifp->if_afdata[AF_INET6] == NULL) 939 continue; 940 ndi = ND_IFINFO(ifp); 941 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 942 /* 943 * We've been generating a random ID on this interface. 944 * Create a new one. 945 */ 946 (void)generate_tmp_ifid(ndi->randomseed0, 947 ndi->randomseed1, ndi->randomid); 948 } 949 } 950 951 CURVNET_RESTORE(); 952} 953 954static void 955in6_purgemaddrs(struct ifnet *ifp) 956{ 957 LIST_HEAD(,in6_multi) purgeinms; 958 struct in6_multi *inm, *tinm; 959 struct ifmultiaddr *ifma; 960 961 LIST_INIT(&purgeinms); 962 IN6_MULTI_LOCK(); 963 964 /* 965 * Extract list of in6_multi associated with the detaching ifp 966 * which the PF_INET6 layer is about to release. 967 * We need to do this as IF_ADDR_LOCK() may be re-acquired 968 * by code further down. 969 */ 970 IF_ADDR_RLOCK(ifp); 971 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 972 if (ifma->ifma_addr->sa_family != AF_INET6 || 973 ifma->ifma_protospec == NULL) 974 continue; 975 inm = (struct in6_multi *)ifma->ifma_protospec; 976 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 977 } 978 IF_ADDR_RUNLOCK(ifp); 979 980 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 981 LIST_REMOVE(inm, in6m_entry); 982 in6m_release_locked(inm); 983 } 984 mld_ifdetach(ifp); 985 986 IN6_MULTI_UNLOCK(); 987} 988