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_var.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/ip_var.h> 58 #include <netinet/udp.h> 59 #include <netinet/udp_var.h> 60 61 #include <netinet/ip6.h> 62 #include <netinet6/ip6_var.h> 63 #include <netinet6/in6_var.h> 64 #include <netinet6/in6_pcb.h> 65 #include <netinet6/in6_ifattach.h> 66 #include <netinet6/ip6_var.h> 67 #include <netinet6/nd6.h> 68 #include <netinet6/mld6_var.h> 69 #include <netinet6/scope6_var.h> 70 71 VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 72 73 #ifdef IP6_AUTO_LINKLOCAL 74 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 75 #else 76 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 77 #endif 78 79 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 80 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 81 82 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 83 #define V_ripcbinfo VNET(ripcbinfo) 84 85 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 86 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 87 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 88 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 89 static int in6_ifattach_loopback(struct ifnet *); 90 static void in6_purgemaddrs(struct ifnet *); 91 92 #define EUI64_GBIT 0x01 93 #define EUI64_UBIT 0x02 94 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 95 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 96 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 97 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 98 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 99 100 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 101 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 102 103 /* 104 * Generate a last-resort interface identifier, when the machine has no 105 * IEEE802/EUI64 address sources. 106 * The goal here is to get an interface identifier that is 107 * (1) random enough and (2) does not change across reboot. 108 * We currently use MD5(hostname) for it. 109 * 110 * in6 - upper 64bits are preserved 111 */ 112 static int 113 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 114 { 115 MD5_CTX ctxt; 116 struct prison *pr; 117 u_int8_t digest[16]; 118 int hostnamelen; 119 120 pr = curthread->td_ucred->cr_prison; 121 mtx_lock(&pr->pr_mtx); 122 hostnamelen = strlen(pr->pr_hostname); 123 #if 0 124 /* we need at least several letters as seed for ifid */ 125 if (hostnamelen < 3) { 126 mtx_unlock(&pr->pr_mtx); 127 return -1; 128 } 129 #endif 130 131 /* generate 8 bytes of pseudo-random value. */ 132 bzero(&ctxt, sizeof(ctxt)); 133 MD5Init(&ctxt); 134 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 135 mtx_unlock(&pr->pr_mtx); 136 MD5Final(digest, &ctxt); 137 138 /* assumes sizeof(digest) > sizeof(ifid) */ 139 bcopy(digest, &in6->s6_addr[8], 8); 140 141 /* make sure to set "u" bit to local, and "g" bit to individual. */ 142 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 143 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 144 145 /* convert EUI64 into IPv6 interface identifier */ 146 EUI64_TO_IFID(in6); 147 148 return 0; 149 } 150 151 static int 152 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 153 { 154 MD5_CTX ctxt; 155 u_int8_t seed[16], digest[16], nullbuf[8]; 156 u_int32_t val32; 157 158 /* If there's no history, start with a random seed. */ 159 bzero(nullbuf, sizeof(nullbuf)); 160 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 161 int i; 162 163 for (i = 0; i < 2; i++) { 164 val32 = arc4random(); 165 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 166 } 167 } else 168 bcopy(seed0, seed, 8); 169 170 /* copy the right-most 64-bits of the given address */ 171 /* XXX assumption on the size of IFID */ 172 bcopy(seed1, &seed[8], 8); 173 174 if (0) { /* for debugging purposes only */ 175 int i; 176 177 printf("generate_tmp_ifid: new randomized ID from: "); 178 for (i = 0; i < 16; i++) 179 printf("%02x", seed[i]); 180 printf(" "); 181 } 182 183 /* generate 16 bytes of pseudo-random value. */ 184 bzero(&ctxt, sizeof(ctxt)); 185 MD5Init(&ctxt); 186 MD5Update(&ctxt, seed, sizeof(seed)); 187 MD5Final(digest, &ctxt); 188 189 /* 190 * RFC 3041 3.2.1. (3) 191 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 192 * left-most bit is numbered 0) to zero. 193 */ 194 bcopy(digest, ret, 8); 195 ret[0] &= ~EUI64_UBIT; 196 197 /* 198 * XXX: we'd like to ensure that the generated value is not zero 199 * for simplicity. If the caclculated digest happens to be zero, 200 * use a random non-zero value as the last resort. 201 */ 202 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 203 nd6log((LOG_INFO, 204 "generate_tmp_ifid: computed MD5 value is zero.\n")); 205 206 val32 = arc4random(); 207 val32 = 1 + (val32 % (0xffffffff - 1)); 208 } 209 210 /* 211 * RFC 3041 3.2.1. (4) 212 * Take the rightmost 64-bits of the MD5 digest and save them in 213 * stable storage as the history value to be used in the next 214 * iteration of the algorithm. 215 */ 216 bcopy(&digest[8], seed0, 8); 217 218 if (0) { /* for debugging purposes only */ 219 int i; 220 221 printf("to: "); 222 for (i = 0; i < 16; i++) 223 printf("%02x", digest[i]); 224 printf("\n"); 225 } 226 227 return 0; 228 } 229 230 /* 231 * Get interface identifier for the specified interface. 232 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 233 * 234 * in6 - upper 64bits are preserved 235 */ 236 int 237 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 238 { 239 struct ifaddr *ifa; 240 struct sockaddr_dl *sdl; 241 u_int8_t *addr; 242 size_t addrlen; 243 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 244 static u_int8_t allone[8] = 245 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 246 247 IF_ADDR_RLOCK(ifp); 248 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 249 if (ifa->ifa_addr->sa_family != AF_LINK) 250 continue; 251 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 252 if (sdl == NULL) 253 continue; 254 if (sdl->sdl_alen == 0) 255 continue; 256 257 goto found; 258 } 259 IF_ADDR_RUNLOCK(ifp); 260 261 return -1; 262 263 found: 264 IF_ADDR_LOCK_ASSERT(ifp); 265 addr = LLADDR(sdl); 266 addrlen = sdl->sdl_alen; 267 268 /* get EUI64 */ 269 switch (ifp->if_type) { 270 case IFT_BRIDGE: 271 case IFT_ETHER: 272 case IFT_L2VLAN: 273 case IFT_FDDI: 274 case IFT_ISO88025: 275 case IFT_ATM: 276 case IFT_IEEE1394: 277 case IFT_IEEE80211: 278 /* IEEE802/EUI64 cases - what others? */ 279 /* IEEE1394 uses 16byte length address starting with EUI64 */ 280 if (addrlen > 8) 281 addrlen = 8; 282 283 /* look at IEEE802/EUI64 only */ 284 if (addrlen != 8 && addrlen != 6) { 285 IF_ADDR_RUNLOCK(ifp); 286 return -1; 287 } 288 289 /* 290 * check for invalid MAC address - on bsdi, we see it a lot 291 * since wildboar configures all-zero MAC on pccard before 292 * card insertion. 293 */ 294 if (bcmp(addr, allzero, addrlen) == 0) { 295 IF_ADDR_RUNLOCK(ifp); 296 return -1; 297 } 298 if (bcmp(addr, allone, addrlen) == 0) { 299 IF_ADDR_RUNLOCK(ifp); 300 return -1; 301 } 302 303 /* make EUI64 address */ 304 if (addrlen == 8) 305 bcopy(addr, &in6->s6_addr[8], 8); 306 else if (addrlen == 6) { 307 in6->s6_addr[8] = addr[0]; 308 in6->s6_addr[9] = addr[1]; 309 in6->s6_addr[10] = addr[2]; 310 in6->s6_addr[11] = 0xff; 311 in6->s6_addr[12] = 0xfe; 312 in6->s6_addr[13] = addr[3]; 313 in6->s6_addr[14] = addr[4]; 314 in6->s6_addr[15] = addr[5]; 315 } 316 break; 317 318 case IFT_ARCNET: 319 if (addrlen != 1) { 320 IF_ADDR_RUNLOCK(ifp); 321 return -1; 322 } 323 if (!addr[0]) { 324 IF_ADDR_RUNLOCK(ifp); 325 return -1; 326 } 327 328 bzero(&in6->s6_addr[8], 8); 329 in6->s6_addr[15] = addr[0]; 330 331 /* 332 * due to insufficient bitwidth, we mark it local. 333 */ 334 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 335 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 336 break; 337 338 case IFT_GIF: 339 case IFT_STF: 340 /* 341 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 342 * however, IPv4 address is not very suitable as unique 343 * identifier source (can be renumbered). 344 * we don't do this. 345 */ 346 IF_ADDR_RUNLOCK(ifp); 347 return -1; 348 349 default: 350 IF_ADDR_RUNLOCK(ifp); 351 return -1; 352 } 353 354 /* sanity check: g bit must not indicate "group" */ 355 if (EUI64_GROUP(in6)) { 356 IF_ADDR_RUNLOCK(ifp); 357 return -1; 358 } 359 360 /* convert EUI64 into IPv6 interface identifier */ 361 EUI64_TO_IFID(in6); 362 363 /* 364 * sanity check: ifid must not be all zero, avoid conflict with 365 * subnet router anycast 366 */ 367 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 368 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 369 IF_ADDR_RUNLOCK(ifp); 370 return -1; 371 } 372 373 IF_ADDR_RUNLOCK(ifp); 374 return 0; 375 } 376 377 /* 378 * Get interface identifier for the specified interface. If it is not 379 * available on ifp0, borrow interface identifier from other information 380 * sources. 381 * 382 * altifp - secondary EUI64 source 383 */ 384 static int 385 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 386 struct in6_addr *in6) 387 { 388 struct ifnet *ifp; 389 390 /* first, try to get it from the interface itself */ 391 if (in6_get_hw_ifid(ifp0, in6) == 0) { 392 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 393 if_name(ifp0))); 394 goto success; 395 } 396 397 /* try secondary EUI64 source. this basically is for ATM PVC */ 398 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 399 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 400 if_name(ifp0), if_name(altifp))); 401 goto success; 402 } 403 404 /* next, try to get it from some other hardware interface */ 405 IFNET_RLOCK_NOSLEEP(); 406 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 407 if (ifp == ifp0) 408 continue; 409 if (in6_get_hw_ifid(ifp, in6) != 0) 410 continue; 411 412 /* 413 * to borrow ifid from other interface, ifid needs to be 414 * globally unique 415 */ 416 if (IFID_UNIVERSAL(in6)) { 417 nd6log((LOG_DEBUG, 418 "%s: borrow interface identifier from %s\n", 419 if_name(ifp0), if_name(ifp))); 420 IFNET_RUNLOCK_NOSLEEP(); 421 goto success; 422 } 423 } 424 IFNET_RUNLOCK_NOSLEEP(); 425 426 /* last resort: get from random number source */ 427 if (get_rand_ifid(ifp, in6) == 0) { 428 nd6log((LOG_DEBUG, 429 "%s: interface identifier generated by random number\n", 430 if_name(ifp0))); 431 goto success; 432 } 433 434 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 435 return -1; 436 437 success: 438 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 439 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 440 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 441 in6->s6_addr[14], in6->s6_addr[15])); 442 return 0; 443 } 444 445 /* 446 * altifp - secondary EUI64 source 447 */ 448 static int 449 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 450 { 451 struct in6_ifaddr *ia; 452 struct in6_aliasreq ifra; 453 struct nd_prefixctl pr0; 454 int error; 455 456 /* 457 * configure link-local address. 458 */ 459 in6_prepare_ifra(&ifra, NULL, &in6mask64); 460 461 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 462 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 463 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 464 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 465 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 466 } else { 467 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 468 nd6log((LOG_ERR, 469 "%s: no ifid available\n", if_name(ifp))); 470 return (-1); 471 } 472 } 473 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 474 return (-1); 475 476 /* link-local addresses should NEVER expire. */ 477 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 478 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 479 480 /* 481 * Now call in6_update_ifa() to do a bunch of procedures to configure 482 * a link-local address. We can set the 3rd argument to NULL, because 483 * we know there's no other link-local address on the interface 484 * and therefore we are adding one (instead of updating one). 485 */ 486 if ((error = in6_update_ifa(ifp, &ifra, NULL, 487 IN6_IFAUPDATE_DADDELAY)) != 0) { 488 /* 489 * XXX: When the interface does not support IPv6, this call 490 * would fail in the SIOCSIFADDR ioctl. I believe the 491 * notification is rather confusing in this case, so just 492 * suppress it. (jinmei@kame.net 20010130) 493 */ 494 if (error != EAFNOSUPPORT) 495 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 496 "configure a link-local address on %s " 497 "(errno=%d)\n", 498 if_name(ifp), error)); 499 return (-1); 500 } 501 502 ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */ 503 KASSERT(ia != NULL, ("%s: ia == NULL, ifp=%p", __func__, ifp)); 504 505 ifa_free(&ia->ia_ifa); 506 507 /* 508 * Make the link-local prefix (fe80::%link/64) as on-link. 509 * Since we'd like to manage prefixes separately from addresses, 510 * we make an ND6 prefix structure for the link-local prefix, 511 * and add it to the prefix list as a never-expire prefix. 512 * XXX: this change might affect some existing code base... 513 */ 514 bzero(&pr0, sizeof(pr0)); 515 pr0.ndpr_ifp = ifp; 516 /* this should be 64 at this moment. */ 517 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 518 pr0.ndpr_prefix = ifra.ifra_addr; 519 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 520 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 521 /* 522 * Initialize parameters. The link-local prefix must always be 523 * on-link, and its lifetimes never expire. 524 */ 525 pr0.ndpr_raf_onlink = 1; 526 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 527 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 528 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 529 /* 530 * Since there is no other link-local addresses, nd6_prefix_lookup() 531 * probably returns NULL. However, we cannot always expect the result. 532 * For example, if we first remove the (only) existing link-local 533 * address, and then reconfigure another one, the prefix is still 534 * valid with referring to the old link-local address. 535 */ 536 if (nd6_prefix_lookup(&pr0) == NULL) { 537 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 538 return (error); 539 } 540 541 return 0; 542 } 543 544 /* 545 * ifp - must be IFT_LOOP 546 */ 547 static int 548 in6_ifattach_loopback(struct ifnet *ifp) 549 { 550 struct in6_aliasreq ifra; 551 int error; 552 553 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 554 555 /* 556 * Always initialize ia_dstaddr (= broadcast address) to loopback 557 * address. Follows IPv4 practice - see in_ifinit(). 558 */ 559 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 560 ifra.ifra_dstaddr.sin6_family = AF_INET6; 561 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 562 563 /* the loopback address should NEVER expire. */ 564 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 565 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 566 567 /* we don't need to perform DAD on loopback interfaces. */ 568 ifra.ifra_flags |= IN6_IFF_NODAD; 569 570 /* skip registration to the prefix list. XXX should be temporary. */ 571 ifra.ifra_flags |= IN6_IFF_NOPFX; 572 573 /* 574 * We are sure that this is a newly assigned address, so we can set 575 * NULL to the 3rd arg. 576 */ 577 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 578 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 579 "the loopback address on %s (errno=%d)\n", 580 if_name(ifp), error)); 581 return (-1); 582 } 583 584 return 0; 585 } 586 587 /* 588 * compute NI group address, based on the current hostname setting. 589 * see RFC 4620. 590 * 591 * when ifp == NULL, the caller is responsible for filling scopeid. 592 * 593 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 594 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 595 */ 596 static int 597 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 598 struct in6_addr *in6, int oldmcprefix) 599 { 600 struct prison *pr; 601 const char *p; 602 u_char *q; 603 MD5_CTX ctxt; 604 u_int8_t digest[16]; 605 char l; 606 char n[64]; /* a single label must not exceed 63 chars */ 607 608 /* 609 * If no name is given and namelen is -1, 610 * we try to do the hostname lookup ourselves. 611 */ 612 if (!name && namelen == -1) { 613 pr = curthread->td_ucred->cr_prison; 614 mtx_lock(&pr->pr_mtx); 615 name = pr->pr_hostname; 616 namelen = strlen(name); 617 } else 618 pr = NULL; 619 if (!name || !namelen) { 620 if (pr != NULL) 621 mtx_unlock(&pr->pr_mtx); 622 return -1; 623 } 624 625 p = name; 626 while (p && *p && *p != '.' && p - name < namelen) 627 p++; 628 if (p == name || p - name > sizeof(n) - 1) { 629 if (pr != NULL) 630 mtx_unlock(&pr->pr_mtx); 631 return -1; /* label too long */ 632 } 633 l = p - name; 634 strncpy(n, name, l); 635 if (pr != NULL) 636 mtx_unlock(&pr->pr_mtx); 637 n[(int)l] = '\0'; 638 for (q = n; *q; q++) { 639 if ('A' <= *q && *q <= 'Z') 640 *q = *q - 'A' + 'a'; 641 } 642 643 /* generate 16 bytes of pseudo-random value. */ 644 bzero(&ctxt, sizeof(ctxt)); 645 MD5Init(&ctxt); 646 MD5Update(&ctxt, &l, sizeof(l)); 647 MD5Update(&ctxt, n, l); 648 MD5Final(digest, &ctxt); 649 650 bzero(in6, sizeof(*in6)); 651 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 652 in6->s6_addr8[11] = 2; 653 if (oldmcprefix == 0) { 654 in6->s6_addr8[12] = 0xff; 655 /* Copy the first 24 bits of 128-bit hash into the address. */ 656 bcopy(digest, &in6->s6_addr8[13], 3); 657 } else { 658 /* Copy the first 32 bits of 128-bit hash into the address. */ 659 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 660 } 661 if (in6_setscope(in6, ifp, NULL)) 662 return (-1); /* XXX: should not fail */ 663 664 return 0; 665 } 666 667 int 668 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 669 struct in6_addr *in6) 670 { 671 672 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 673 } 674 675 int 676 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 677 struct in6_addr *in6) 678 { 679 680 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 681 } 682 683 /* 684 * XXX multiple loopback interface needs more care. for instance, 685 * nodelocal address needs to be configured onto only one of them. 686 * XXX multiple link-local address case 687 * 688 * altifp - secondary EUI64 source 689 */ 690 void 691 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 692 { 693 struct in6_ifaddr *ia; 694 struct in6_addr in6; 695 696 if (ifp->if_afdata[AF_INET6] == NULL) 697 return; 698 /* 699 * quirks based on interface type 700 */ 701 switch (ifp->if_type) { 702 case IFT_STF: 703 /* 704 * 6to4 interface is a very special kind of beast. 705 * no multicast, no linklocal. RFC2529 specifies how to make 706 * linklocals for 6to4 interface, but there's no use and 707 * it is rather harmful to have one. 708 */ 709 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 710 break; 711 default: 712 break; 713 } 714 715 /* 716 * usually, we require multicast capability to the interface 717 */ 718 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 719 nd6log((LOG_INFO, "in6_ifattach: " 720 "%s is not multicast capable, IPv6 not enabled\n", 721 if_name(ifp))); 722 return; 723 } 724 725 /* 726 * assign loopback address for loopback interface. 727 * XXX multiple loopback interface case. 728 */ 729 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 730 struct ifaddr *ifa; 731 732 in6 = in6addr_loopback; 733 ifa = (struct ifaddr *)in6ifa_ifpwithaddr(ifp, &in6); 734 if (ifa == NULL) { 735 if (in6_ifattach_loopback(ifp) != 0) 736 return; 737 } else 738 ifa_free(ifa); 739 } 740 741 /* 742 * assign a link-local address, if there's none. 743 */ 744 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 745 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 746 int error; 747 748 ia = in6ifa_ifpforlinklocal(ifp, 0); 749 if (ia == NULL) { 750 error = in6_ifattach_linklocal(ifp, altifp); 751 #if 0 752 if (error) 753 log(LOG_NOTICE, "in6_ifattach_linklocal: " 754 "failed to add a link-local addr to %s\n", 755 if_name(ifp)); 756 #endif 757 } else 758 ifa_free(&ia->ia_ifa); 759 } 760 761 /* update dynamically. */ 762 if (V_in6_maxmtu < ifp->if_mtu) 763 V_in6_maxmtu = ifp->if_mtu; 764 } 765 766 /* 767 * NOTE: in6_ifdetach() does not support loopback if at this moment. 768 * We don't need this function in bsdi, because interfaces are never removed 769 * from the ifnet list in bsdi. 770 */ 771 void 772 in6_ifdetach(struct ifnet *ifp) 773 { 774 struct ifaddr *ifa, *next; 775 776 if (ifp->if_afdata[AF_INET6] == NULL) 777 return; 778 779 /* remove neighbor management table */ 780 nd6_purge(ifp); 781 782 /* 783 * nuke any of IPv6 addresses we have 784 * XXX: all addresses should be already removed 785 */ 786 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 787 if (ifa->ifa_addr->sa_family != AF_INET6) 788 continue; 789 in6_purgeaddr(ifa); 790 } 791 in6_pcbpurgeif0(&V_udbinfo, ifp); 792 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 793 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 794 /* leave from all multicast groups joined */ 795 in6_purgemaddrs(ifp); 796 797 /* 798 * remove neighbor management table. we call it twice just to make 799 * sure we nuke everything. maybe we need just one call. 800 * XXX: since the first call did not release addresses, some prefixes 801 * might remain. We should call nd6_purge() again to release the 802 * prefixes after removing all addresses above. 803 * (Or can we just delay calling nd6_purge until at this point?) 804 */ 805 nd6_purge(ifp); 806 } 807 808 int 809 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 810 const u_int8_t *baseid, int generate) 811 { 812 u_int8_t nullbuf[8]; 813 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 814 815 bzero(nullbuf, sizeof(nullbuf)); 816 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 817 /* we've never created a random ID. Create a new one. */ 818 generate = 1; 819 } 820 821 if (generate) { 822 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 823 824 /* generate_tmp_ifid will update seedn and buf */ 825 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 826 ndi->randomid); 827 } 828 bcopy(ndi->randomid, retbuf, 8); 829 830 return (0); 831 } 832 833 void 834 in6_tmpaddrtimer(void *arg) 835 { 836 CURVNET_SET((struct vnet *) arg); 837 struct nd_ifinfo *ndi; 838 u_int8_t nullbuf[8]; 839 struct ifnet *ifp; 840 841 callout_reset(&V_in6_tmpaddrtimer_ch, 842 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 843 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 844 845 bzero(nullbuf, sizeof(nullbuf)); 846 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 847 if (ifp->if_afdata[AF_INET6] == NULL) 848 continue; 849 ndi = ND_IFINFO(ifp); 850 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 851 /* 852 * We've been generating a random ID on this interface. 853 * Create a new one. 854 */ 855 (void)generate_tmp_ifid(ndi->randomseed0, 856 ndi->randomseed1, ndi->randomid); 857 } 858 } 859 860 CURVNET_RESTORE(); 861 } 862 863 static void 864 in6_purgemaddrs(struct ifnet *ifp) 865 { 866 LIST_HEAD(,in6_multi) purgeinms; 867 struct in6_multi *inm, *tinm; 868 struct ifmultiaddr *ifma; 869 870 LIST_INIT(&purgeinms); 871 IN6_MULTI_LOCK(); 872 873 /* 874 * Extract list of in6_multi associated with the detaching ifp 875 * which the PF_INET6 layer is about to release. 876 * We need to do this as IF_ADDR_LOCK() may be re-acquired 877 * by code further down. 878 */ 879 IF_ADDR_RLOCK(ifp); 880 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 881 if (ifma->ifma_addr->sa_family != AF_INET6 || 882 ifma->ifma_protospec == NULL) 883 continue; 884 inm = (struct in6_multi *)ifma->ifma_protospec; 885 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 886 } 887 IF_ADDR_RUNLOCK(ifp); 888 889 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 890 LIST_REMOVE(inm, in6m_entry); 891 in6m_release_locked(inm); 892 } 893 mld_ifdetach(ifp); 894 895 IN6_MULTI_UNLOCK(); 896 } 897