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/lock.h> 43 #include <sys/proc.h> 44 #include <sys/rmlock.h> 45 #include <sys/syslog.h> 46 #include <sys/md5.h> 47 48 #include <net/if.h> 49 #include <net/if_var.h> 50 #include <net/if_dl.h> 51 #include <net/if_types.h> 52 #include <net/route.h> 53 #include <net/vnet.h> 54 55 #include <netinet/in.h> 56 #include <netinet/in_var.h> 57 #include <netinet/if_ether.h> 58 #include <netinet/in_pcb.h> 59 #include <netinet/ip_var.h> 60 #include <netinet/udp.h> 61 #include <netinet/udp_var.h> 62 63 #include <netinet/ip6.h> 64 #include <netinet6/ip6_var.h> 65 #include <netinet6/in6_var.h> 66 #include <netinet6/in6_pcb.h> 67 #include <netinet6/in6_ifattach.h> 68 #include <netinet6/ip6_var.h> 69 #include <netinet6/nd6.h> 70 #include <netinet6/mld6_var.h> 71 #include <netinet6/scope6_var.h> 72 73 VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 74 75 #ifdef IP6_AUTO_LINKLOCAL 76 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 77 #else 78 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 79 #endif 80 81 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 82 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 83 84 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 85 #define V_ripcbinfo VNET(ripcbinfo) 86 87 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 88 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 89 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 90 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 91 static int in6_ifattach_loopback(struct ifnet *); 92 static void in6_purgemaddrs(struct ifnet *); 93 94 #define EUI64_GBIT 0x01 95 #define EUI64_UBIT 0x02 96 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 97 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 98 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 99 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 100 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 101 102 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 103 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 104 105 /* 106 * Generate a last-resort interface identifier, when the machine has no 107 * IEEE802/EUI64 address sources. 108 * The goal here is to get an interface identifier that is 109 * (1) random enough and (2) does not change across reboot. 110 * We currently use MD5(hostname) for it. 111 * 112 * in6 - upper 64bits are preserved 113 */ 114 static int 115 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 116 { 117 MD5_CTX ctxt; 118 struct prison *pr; 119 u_int8_t digest[16]; 120 int hostnamelen; 121 122 pr = curthread->td_ucred->cr_prison; 123 mtx_lock(&pr->pr_mtx); 124 hostnamelen = strlen(pr->pr_hostname); 125 #if 0 126 /* we need at least several letters as seed for ifid */ 127 if (hostnamelen < 3) { 128 mtx_unlock(&pr->pr_mtx); 129 return -1; 130 } 131 #endif 132 133 /* generate 8 bytes of pseudo-random value. */ 134 bzero(&ctxt, sizeof(ctxt)); 135 MD5Init(&ctxt); 136 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 137 mtx_unlock(&pr->pr_mtx); 138 MD5Final(digest, &ctxt); 139 140 /* assumes sizeof(digest) > sizeof(ifid) */ 141 bcopy(digest, &in6->s6_addr[8], 8); 142 143 /* make sure to set "u" bit to local, and "g" bit to individual. */ 144 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 145 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 146 147 /* convert EUI64 into IPv6 interface identifier */ 148 EUI64_TO_IFID(in6); 149 150 return 0; 151 } 152 153 static int 154 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 155 { 156 MD5_CTX ctxt; 157 u_int8_t seed[16], digest[16], nullbuf[8]; 158 u_int32_t val32; 159 160 /* If there's no history, start with a random seed. */ 161 bzero(nullbuf, sizeof(nullbuf)); 162 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 163 int i; 164 165 for (i = 0; i < 2; i++) { 166 val32 = arc4random(); 167 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 168 } 169 } else 170 bcopy(seed0, seed, 8); 171 172 /* copy the right-most 64-bits of the given address */ 173 /* XXX assumption on the size of IFID */ 174 bcopy(seed1, &seed[8], 8); 175 176 if (0) { /* for debugging purposes only */ 177 int i; 178 179 printf("generate_tmp_ifid: new randomized ID from: "); 180 for (i = 0; i < 16; i++) 181 printf("%02x", seed[i]); 182 printf(" "); 183 } 184 185 /* generate 16 bytes of pseudo-random value. */ 186 bzero(&ctxt, sizeof(ctxt)); 187 MD5Init(&ctxt); 188 MD5Update(&ctxt, seed, sizeof(seed)); 189 MD5Final(digest, &ctxt); 190 191 /* 192 * RFC 3041 3.2.1. (3) 193 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 194 * left-most bit is numbered 0) to zero. 195 */ 196 bcopy(digest, ret, 8); 197 ret[0] &= ~EUI64_UBIT; 198 199 /* 200 * XXX: we'd like to ensure that the generated value is not zero 201 * for simplicity. If the caclculated digest happens to be zero, 202 * use a random non-zero value as the last resort. 203 */ 204 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 205 nd6log((LOG_INFO, 206 "generate_tmp_ifid: computed MD5 value is zero.\n")); 207 208 val32 = arc4random(); 209 val32 = 1 + (val32 % (0xffffffff - 1)); 210 } 211 212 /* 213 * RFC 3041 3.2.1. (4) 214 * Take the rightmost 64-bits of the MD5 digest and save them in 215 * stable storage as the history value to be used in the next 216 * iteration of the algorithm. 217 */ 218 bcopy(&digest[8], seed0, 8); 219 220 if (0) { /* for debugging purposes only */ 221 int i; 222 223 printf("to: "); 224 for (i = 0; i < 16; i++) 225 printf("%02x", digest[i]); 226 printf("\n"); 227 } 228 229 return 0; 230 } 231 232 /* 233 * Get interface identifier for the specified interface. 234 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 235 * 236 * in6 - upper 64bits are preserved 237 */ 238 int 239 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 240 { 241 struct ifaddr *ifa; 242 struct sockaddr_dl *sdl; 243 u_int8_t *addr; 244 size_t addrlen; 245 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 246 static u_int8_t allone[8] = 247 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 248 249 IF_ADDR_RLOCK(ifp); 250 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 251 if (ifa->ifa_addr->sa_family != AF_LINK) 252 continue; 253 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 254 if (sdl == NULL) 255 continue; 256 if (sdl->sdl_alen == 0) 257 continue; 258 259 goto found; 260 } 261 IF_ADDR_RUNLOCK(ifp); 262 263 return -1; 264 265 found: 266 IF_ADDR_LOCK_ASSERT(ifp); 267 addr = LLADDR(sdl); 268 addrlen = sdl->sdl_alen; 269 270 /* get EUI64 */ 271 switch (ifp->if_type) { 272 case IFT_BRIDGE: 273 case IFT_ETHER: 274 case IFT_L2VLAN: 275 case IFT_FDDI: 276 case IFT_ISO88025: 277 case IFT_ATM: 278 case IFT_IEEE1394: 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 case IFT_STF: 341 /* 342 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 343 * however, IPv4 address is not very suitable as unique 344 * identifier source (can be renumbered). 345 * we don't do this. 346 */ 347 IF_ADDR_RUNLOCK(ifp); 348 return -1; 349 350 default: 351 IF_ADDR_RUNLOCK(ifp); 352 return -1; 353 } 354 355 /* sanity check: g bit must not indicate "group" */ 356 if (EUI64_GROUP(in6)) { 357 IF_ADDR_RUNLOCK(ifp); 358 return -1; 359 } 360 361 /* convert EUI64 into IPv6 interface identifier */ 362 EUI64_TO_IFID(in6); 363 364 /* 365 * sanity check: ifid must not be all zero, avoid conflict with 366 * subnet router anycast 367 */ 368 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 369 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 370 IF_ADDR_RUNLOCK(ifp); 371 return -1; 372 } 373 374 IF_ADDR_RUNLOCK(ifp); 375 return 0; 376 } 377 378 /* 379 * Get interface identifier for the specified interface. If it is not 380 * available on ifp0, borrow interface identifier from other information 381 * sources. 382 * 383 * altifp - secondary EUI64 source 384 */ 385 static int 386 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 387 struct in6_addr *in6) 388 { 389 struct ifnet *ifp; 390 391 /* first, try to get it from the interface itself */ 392 if (in6_get_hw_ifid(ifp0, in6) == 0) { 393 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 394 if_name(ifp0))); 395 goto success; 396 } 397 398 /* try secondary EUI64 source. this basically is for ATM PVC */ 399 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 400 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 401 if_name(ifp0), if_name(altifp))); 402 goto success; 403 } 404 405 /* next, try to get it from some other hardware interface */ 406 IFNET_RLOCK_NOSLEEP(); 407 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 408 if (ifp == ifp0) 409 continue; 410 if (in6_get_hw_ifid(ifp, in6) != 0) 411 continue; 412 413 /* 414 * to borrow ifid from other interface, ifid needs to be 415 * globally unique 416 */ 417 if (IFID_UNIVERSAL(in6)) { 418 nd6log((LOG_DEBUG, 419 "%s: borrow interface identifier from %s\n", 420 if_name(ifp0), if_name(ifp))); 421 IFNET_RUNLOCK_NOSLEEP(); 422 goto success; 423 } 424 } 425 IFNET_RUNLOCK_NOSLEEP(); 426 427 /* last resort: get from random number source */ 428 if (get_rand_ifid(ifp, in6) == 0) { 429 nd6log((LOG_DEBUG, 430 "%s: interface identifier generated by random number\n", 431 if_name(ifp0))); 432 goto success; 433 } 434 435 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 436 return -1; 437 438 success: 439 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 440 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 441 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 442 in6->s6_addr[14], in6->s6_addr[15])); 443 return 0; 444 } 445 446 /* 447 * altifp - secondary EUI64 source 448 */ 449 static int 450 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 451 { 452 struct in6_ifaddr *ia; 453 struct in6_aliasreq ifra; 454 struct nd_prefixctl pr0; 455 struct nd_prefix *pr; 456 int error; 457 458 /* 459 * configure link-local address. 460 */ 461 in6_prepare_ifra(&ifra, NULL, &in6mask64); 462 463 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 464 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 465 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 466 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 467 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 468 } else { 469 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 470 nd6log((LOG_ERR, 471 "%s: no ifid available\n", if_name(ifp))); 472 return (-1); 473 } 474 } 475 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 476 return (-1); 477 478 /* link-local addresses should NEVER expire. */ 479 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 480 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 481 482 /* 483 * Now call in6_update_ifa() to do a bunch of procedures to configure 484 * a link-local address. We can set the 3rd argument to NULL, because 485 * we know there's no other link-local address on the interface 486 * and therefore we are adding one (instead of updating one). 487 */ 488 if ((error = in6_update_ifa(ifp, &ifra, NULL, 489 IN6_IFAUPDATE_DADDELAY)) != 0) { 490 /* 491 * XXX: When the interface does not support IPv6, this call 492 * would fail in the SIOCSIFADDR ioctl. I believe the 493 * notification is rather confusing in this case, so just 494 * suppress it. (jinmei@kame.net 20010130) 495 */ 496 if (error != EAFNOSUPPORT) 497 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 498 "configure a link-local address on %s " 499 "(errno=%d)\n", 500 if_name(ifp), error)); 501 return (-1); 502 } 503 504 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 505 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 506 507 ifa_free(&ia->ia_ifa); 508 509 /* 510 * Make the link-local prefix (fe80::%link/64) as on-link. 511 * Since we'd like to manage prefixes separately from addresses, 512 * we make an ND6 prefix structure for the link-local prefix, 513 * and add it to the prefix list as a never-expire prefix. 514 * XXX: this change might affect some existing code base... 515 */ 516 bzero(&pr0, sizeof(pr0)); 517 pr0.ndpr_ifp = ifp; 518 /* this should be 64 at this moment. */ 519 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 520 pr0.ndpr_prefix = ifra.ifra_addr; 521 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 522 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 523 /* 524 * Initialize parameters. The link-local prefix must always be 525 * on-link, and its lifetimes never expire. 526 */ 527 pr0.ndpr_raf_onlink = 1; 528 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 529 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 530 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 531 /* 532 * Since there is no other link-local addresses, nd6_prefix_lookup() 533 * probably returns NULL. However, we cannot always expect the result. 534 * For example, if we first remove the (only) existing link-local 535 * address, and then reconfigure another one, the prefix is still 536 * valid with referring to the old link-local address. 537 */ 538 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 539 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 540 return (error); 541 } else 542 nd6_prefix_rele(pr); 543 544 return 0; 545 } 546 547 /* 548 * ifp - must be IFT_LOOP 549 */ 550 static int 551 in6_ifattach_loopback(struct ifnet *ifp) 552 { 553 struct in6_aliasreq ifra; 554 int error; 555 556 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 557 558 /* 559 * Always initialize ia_dstaddr (= broadcast address) to loopback 560 * address. Follows IPv4 practice - see in_ifinit(). 561 */ 562 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 563 ifra.ifra_dstaddr.sin6_family = AF_INET6; 564 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 565 566 /* the loopback address should NEVER expire. */ 567 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 568 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 569 570 /* 571 * We are sure that this is a newly assigned address, so we can set 572 * NULL to the 3rd arg. 573 */ 574 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 575 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 576 "the loopback address on %s (errno=%d)\n", 577 if_name(ifp), error)); 578 return (-1); 579 } 580 581 return 0; 582 } 583 584 /* 585 * compute NI group address, based on the current hostname setting. 586 * see RFC 4620. 587 * 588 * when ifp == NULL, the caller is responsible for filling scopeid. 589 * 590 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 591 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 592 */ 593 static int 594 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 595 struct in6_addr *in6, int oldmcprefix) 596 { 597 struct prison *pr; 598 const char *p; 599 u_char *q; 600 MD5_CTX ctxt; 601 u_int8_t digest[16]; 602 char l; 603 char n[64]; /* a single label must not exceed 63 chars */ 604 605 /* 606 * If no name is given and namelen is -1, 607 * we try to do the hostname lookup ourselves. 608 */ 609 if (!name && namelen == -1) { 610 pr = curthread->td_ucred->cr_prison; 611 mtx_lock(&pr->pr_mtx); 612 name = pr->pr_hostname; 613 namelen = strlen(name); 614 } else 615 pr = NULL; 616 if (!name || !namelen) { 617 if (pr != NULL) 618 mtx_unlock(&pr->pr_mtx); 619 return -1; 620 } 621 622 p = name; 623 while (p && *p && *p != '.' && p - name < namelen) 624 p++; 625 if (p == name || p - name > sizeof(n) - 1) { 626 if (pr != NULL) 627 mtx_unlock(&pr->pr_mtx); 628 return -1; /* label too long */ 629 } 630 l = p - name; 631 strncpy(n, name, l); 632 if (pr != NULL) 633 mtx_unlock(&pr->pr_mtx); 634 n[(int)l] = '\0'; 635 for (q = n; *q; q++) { 636 if ('A' <= *q && *q <= 'Z') 637 *q = *q - 'A' + 'a'; 638 } 639 640 /* generate 16 bytes of pseudo-random value. */ 641 bzero(&ctxt, sizeof(ctxt)); 642 MD5Init(&ctxt); 643 MD5Update(&ctxt, &l, sizeof(l)); 644 MD5Update(&ctxt, n, l); 645 MD5Final(digest, &ctxt); 646 647 bzero(in6, sizeof(*in6)); 648 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 649 in6->s6_addr8[11] = 2; 650 if (oldmcprefix == 0) { 651 in6->s6_addr8[12] = 0xff; 652 /* Copy the first 24 bits of 128-bit hash into the address. */ 653 bcopy(digest, &in6->s6_addr8[13], 3); 654 } else { 655 /* Copy the first 32 bits of 128-bit hash into the address. */ 656 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 657 } 658 if (in6_setscope(in6, ifp, NULL)) 659 return (-1); /* XXX: should not fail */ 660 661 return 0; 662 } 663 664 int 665 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 666 struct in6_addr *in6) 667 { 668 669 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 670 } 671 672 int 673 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 674 struct in6_addr *in6) 675 { 676 677 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 678 } 679 680 /* 681 * XXX multiple loopback interface needs more care. for instance, 682 * nodelocal address needs to be configured onto only one of them. 683 * XXX multiple link-local address case 684 * 685 * altifp - secondary EUI64 source 686 */ 687 void 688 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 689 { 690 struct in6_ifaddr *ia; 691 struct in6_addr in6; 692 693 if (ifp->if_afdata[AF_INET6] == NULL) 694 return; 695 /* 696 * quirks based on interface type 697 */ 698 switch (ifp->if_type) { 699 case IFT_STF: 700 /* 701 * 6to4 interface is a very special kind of beast. 702 * no multicast, no linklocal. RFC2529 specifies how to make 703 * linklocals for 6to4 interface, but there's no use and 704 * it is rather harmful to have one. 705 */ 706 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 707 break; 708 default: 709 break; 710 } 711 712 /* 713 * usually, we require multicast capability to the interface 714 */ 715 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 716 nd6log((LOG_INFO, "in6_ifattach: " 717 "%s is not multicast capable, IPv6 not enabled\n", 718 if_name(ifp))); 719 return; 720 } 721 722 /* 723 * assign loopback address for loopback interface. 724 * XXX multiple loopback interface case. 725 */ 726 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 727 struct ifaddr *ifa; 728 729 in6 = in6addr_loopback; 730 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 731 if (ifa == NULL) { 732 if (in6_ifattach_loopback(ifp) != 0) 733 return; 734 } else 735 ifa_free(ifa); 736 } 737 738 /* 739 * assign a link-local address, if there's none. 740 */ 741 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 742 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 743 int error; 744 745 ia = in6ifa_ifpforlinklocal(ifp, 0); 746 if (ia == NULL) { 747 error = in6_ifattach_linklocal(ifp, altifp); 748 #if 0 749 if (error) 750 log(LOG_NOTICE, "in6_ifattach_linklocal: " 751 "failed to add a link-local addr to %s\n", 752 if_name(ifp)); 753 #endif 754 } else 755 ifa_free(&ia->ia_ifa); 756 } 757 758 /* update dynamically. */ 759 if (V_in6_maxmtu < ifp->if_mtu) 760 V_in6_maxmtu = ifp->if_mtu; 761 } 762 763 /* 764 * NOTE: in6_ifdetach() does not support loopback if at this moment. 765 * 766 * When shutting down a VNET we clean up layers top-down. In that case 767 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 768 * and we must not call into these cleanup functions anymore, thus purgeulp 769 * is set to 0 in that case by in6_ifdetach_destroy(). 770 * The normal case of destroying a (cloned) interface still needs to cleanup 771 * everything related to the interface and will have purgeulp set to 1. 772 */ 773 static void 774 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 775 { 776 struct ifaddr *ifa, *next; 777 778 if (ifp->if_afdata[AF_INET6] == NULL) 779 return; 780 781 /* 782 * nuke any of IPv6 addresses we have 783 * XXX: all addresses should be already removed 784 */ 785 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 786 if (ifa->ifa_addr->sa_family != AF_INET6) 787 continue; 788 in6_purgeaddr(ifa); 789 } 790 if (purgeulp) { 791 in6_pcbpurgeif0(&V_udbinfo, ifp); 792 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 793 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 794 } 795 /* leave from all multicast groups joined */ 796 in6_purgemaddrs(ifp); 797 798 /* 799 * Remove neighbor management table. 800 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 801 * teardown as the IPv6 layer is cleaned up already and the locks 802 * are destroyed. 803 */ 804 if (purgeulp) 805 nd6_purge(ifp); 806 } 807 808 void 809 in6_ifdetach(struct ifnet *ifp) 810 { 811 812 _in6_ifdetach(ifp, 1); 813 } 814 815 void 816 in6_ifdetach_destroy(struct ifnet *ifp) 817 { 818 819 _in6_ifdetach(ifp, 0); 820 } 821 822 int 823 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 824 const u_int8_t *baseid, int generate) 825 { 826 u_int8_t nullbuf[8]; 827 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 828 829 bzero(nullbuf, sizeof(nullbuf)); 830 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 831 /* we've never created a random ID. Create a new one. */ 832 generate = 1; 833 } 834 835 if (generate) { 836 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 837 838 /* generate_tmp_ifid will update seedn and buf */ 839 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 840 ndi->randomid); 841 } 842 bcopy(ndi->randomid, retbuf, 8); 843 844 return (0); 845 } 846 847 void 848 in6_tmpaddrtimer(void *arg) 849 { 850 CURVNET_SET((struct vnet *) arg); 851 struct nd_ifinfo *ndi; 852 u_int8_t nullbuf[8]; 853 struct ifnet *ifp; 854 855 callout_reset(&V_in6_tmpaddrtimer_ch, 856 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 857 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 858 859 bzero(nullbuf, sizeof(nullbuf)); 860 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 861 if (ifp->if_afdata[AF_INET6] == NULL) 862 continue; 863 ndi = ND_IFINFO(ifp); 864 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 865 /* 866 * We've been generating a random ID on this interface. 867 * Create a new one. 868 */ 869 (void)generate_tmp_ifid(ndi->randomseed0, 870 ndi->randomseed1, ndi->randomid); 871 } 872 } 873 874 CURVNET_RESTORE(); 875 } 876 877 static void 878 in6_purgemaddrs(struct ifnet *ifp) 879 { 880 LIST_HEAD(,in6_multi) purgeinms; 881 struct in6_multi *inm, *tinm; 882 struct ifmultiaddr *ifma; 883 884 LIST_INIT(&purgeinms); 885 IN6_MULTI_LOCK(); 886 887 /* 888 * Extract list of in6_multi associated with the detaching ifp 889 * which the PF_INET6 layer is about to release. 890 * We need to do this as IF_ADDR_LOCK() may be re-acquired 891 * by code further down. 892 */ 893 IF_ADDR_RLOCK(ifp); 894 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 895 if (ifma->ifma_addr->sa_family != AF_INET6 || 896 ifma->ifma_protospec == NULL) 897 continue; 898 inm = (struct in6_multi *)ifma->ifma_protospec; 899 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 900 } 901 IF_ADDR_RUNLOCK(ifp); 902 903 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 904 LIST_REMOVE(inm, in6m_entry); 905 in6m_release_locked(inm); 906 } 907 mld_ifdetach(ifp); 908 909 IN6_MULTI_UNLOCK(); 910 } 911 912 void 913 in6_ifattach_destroy(void) 914 { 915 916 callout_drain(&V_in6_tmpaddrtimer_ch); 917 } 918 919 static void 920 in6_ifattach_init(void *dummy) 921 { 922 923 /* Timer for regeneranation of temporary addresses randomize ID. */ 924 callout_init(&V_in6_tmpaddrtimer_ch, 0); 925 callout_reset(&V_in6_tmpaddrtimer_ch, 926 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 927 V_ip6_temp_regen_advance) * hz, 928 in6_tmpaddrtimer, curvnet); 929 } 930 931 /* 932 * Cheat. 933 * This must be after route_init(), which is now SI_ORDER_THIRD. 934 */ 935 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 936 in6_ifattach_init, NULL); 937