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sys/netinet6/in6_ifattach.c
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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 case IFT_IEEE80211: 280 /* IEEE802/EUI64 cases - what others? */ 281 /* IEEE1394 uses 16byte length address starting with EUI64 */ 282 if (addrlen > 8) 283 addrlen = 8; 284 285 /* look at IEEE802/EUI64 only */ 286 if (addrlen != 8 && addrlen != 6) { 287 IF_ADDR_RUNLOCK(ifp); 288 return -1; 289 } 290 291 /* 292 * check for invalid MAC address - on bsdi, we see it a lot 293 * since wildboar configures all-zero MAC on pccard before 294 * card insertion. 295 */ 296 if (bcmp(addr, allzero, addrlen) == 0) { 297 IF_ADDR_RUNLOCK(ifp); 298 return -1; 299 } 300 if (bcmp(addr, allone, addrlen) == 0) { 301 IF_ADDR_RUNLOCK(ifp); 302 return -1; 303 } 304 305 /* make EUI64 address */ 306 if (addrlen == 8) 307 bcopy(addr, &in6->s6_addr[8], 8); 308 else if (addrlen == 6) { 309 in6->s6_addr[8] = addr[0]; 310 in6->s6_addr[9] = addr[1]; 311 in6->s6_addr[10] = addr[2]; 312 in6->s6_addr[11] = 0xff; 313 in6->s6_addr[12] = 0xfe; 314 in6->s6_addr[13] = addr[3]; 315 in6->s6_addr[14] = addr[4]; 316 in6->s6_addr[15] = addr[5]; 317 } 318 break; 319 320 case IFT_ARCNET: 321 if (addrlen != 1) { 322 IF_ADDR_RUNLOCK(ifp); 323 return -1; 324 } 325 if (!addr[0]) { 326 IF_ADDR_RUNLOCK(ifp); 327 return -1; 328 } 329 330 bzero(&in6->s6_addr[8], 8); 331 in6->s6_addr[15] = addr[0]; 332 333 /* 334 * due to insufficient bitwidth, we mark it local. 335 */ 336 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 337 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 338 break; 339 340 case IFT_GIF: 341 case IFT_STF: 342 /* 343 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 344 * however, IPv4 address is not very suitable as unique 345 * identifier source (can be renumbered). 346 * we don't do this. 347 */ 348 IF_ADDR_RUNLOCK(ifp); 349 return -1; 350 351 case IFT_INFINIBAND: 352 if (addrlen != 20) { 353 IF_ADDR_RUNLOCK(ifp); 354 return -1; 355 } 356 bcopy(addr + 12, &in6->s6_addr[8], 8); 357 break; 358 359 default: 360 IF_ADDR_RUNLOCK(ifp); 361 return -1; 362 } 363 364 /* sanity check: g bit must not indicate "group" */ 365 if (EUI64_GROUP(in6)) { 366 IF_ADDR_RUNLOCK(ifp); 367 return -1; 368 } 369 370 /* convert EUI64 into IPv6 interface identifier */ 371 EUI64_TO_IFID(in6); 372 373 /* 374 * sanity check: ifid must not be all zero, avoid conflict with 375 * subnet router anycast 376 */ 377 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 378 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 379 IF_ADDR_RUNLOCK(ifp); 380 return -1; 381 } 382 383 IF_ADDR_RUNLOCK(ifp); 384 return 0; 385 } 386 387 /* 388 * Get interface identifier for the specified interface. If it is not 389 * available on ifp0, borrow interface identifier from other information 390 * sources. 391 * 392 * altifp - secondary EUI64 source 393 */ 394 static int 395 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 396 struct in6_addr *in6) 397 { 398 struct ifnet *ifp; 399 400 /* first, try to get it from the interface itself */ 401 if (in6_get_hw_ifid(ifp0, in6) == 0) { 402 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 403 if_name(ifp0))); 404 goto success; 405 } 406 407 /* try secondary EUI64 source. this basically is for ATM PVC */ 408 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 409 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 410 if_name(ifp0), if_name(altifp))); 411 goto success; 412 } 413 414 /* next, try to get it from some other hardware interface */ 415 IFNET_RLOCK_NOSLEEP(); 416 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 417 if (ifp == ifp0) 418 continue; 419 if (in6_get_hw_ifid(ifp, in6) != 0) 420 continue; 421 422 /* 423 * to borrow ifid from other interface, ifid needs to be 424 * globally unique 425 */ 426 if (IFID_UNIVERSAL(in6)) { 427 nd6log((LOG_DEBUG, 428 "%s: borrow interface identifier from %s\n", 429 if_name(ifp0), if_name(ifp))); 430 IFNET_RUNLOCK_NOSLEEP(); 431 goto success; 432 } 433 } 434 IFNET_RUNLOCK_NOSLEEP(); 435 436 /* last resort: get from random number source */ 437 if (get_rand_ifid(ifp, in6) == 0) { 438 nd6log((LOG_DEBUG, 439 "%s: interface identifier generated by random number\n", 440 if_name(ifp0))); 441 goto success; 442 } 443 444 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 445 return -1; 446 447 success: 448 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 449 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 450 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 451 in6->s6_addr[14], in6->s6_addr[15])); 452 return 0; 453 } 454 455 /* 456 * altifp - secondary EUI64 source 457 */ 458 static int 459 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 460 { 461 struct in6_ifaddr *ia; 462 struct in6_aliasreq ifra; 463 struct nd_prefixctl pr0; 464 struct nd_prefix *pr; 465 int error; 466 467 /* 468 * configure link-local address. 469 */ 470 in6_prepare_ifra(&ifra, NULL, &in6mask64); 471 472 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 /* link-local addresses should NEVER expire. */ 488 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 489 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 490 491 /* 492 * Now call in6_update_ifa() to do a bunch of procedures to configure 493 * a link-local address. We can set the 3rd argument to NULL, because 494 * we know there's no other link-local address on the interface 495 * and therefore we are adding one (instead of updating one). 496 */ 497 if ((error = in6_update_ifa(ifp, &ifra, NULL, 498 IN6_IFAUPDATE_DADDELAY)) != 0) { 499 /* 500 * XXX: When the interface does not support IPv6, this call 501 * would fail in the SIOCSIFADDR ioctl. I believe the 502 * notification is rather confusing in this case, so just 503 * suppress it. (jinmei@kame.net 20010130) 504 */ 505 if (error != EAFNOSUPPORT) 506 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 507 "configure a link-local address on %s " 508 "(errno=%d)\n", 509 if_name(ifp), error)); 510 return (-1); 511 } 512 513 ia = in6ifa_ifpforlinklocal(ifp, 0); 514 if (ia == NULL) { 515 /* 516 * Another thread removed the address that we just added. 517 * This should be rare, but it happens. 518 */ 519 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 520 "disappeared\n", __func__, if_name(ifp))); 521 return (-1); 522 } 523 ifa_free(&ia->ia_ifa); 524 525 /* 526 * Make the link-local prefix (fe80::%link/64) as on-link. 527 * Since we'd like to manage prefixes separately from addresses, 528 * we make an ND6 prefix structure for the link-local prefix, 529 * and add it to the prefix list as a never-expire prefix. 530 * XXX: this change might affect some existing code base... 531 */ 532 bzero(&pr0, sizeof(pr0)); 533 pr0.ndpr_ifp = ifp; 534 /* this should be 64 at this moment. */ 535 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 536 pr0.ndpr_prefix = ifra.ifra_addr; 537 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 538 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 539 /* 540 * Initialize parameters. The link-local prefix must always be 541 * on-link, and its lifetimes never expire. 542 */ 543 pr0.ndpr_raf_onlink = 1; 544 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 545 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 546 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 547 /* 548 * Since there is no other link-local addresses, nd6_prefix_lookup() 549 * probably returns NULL. However, we cannot always expect the result. 550 * For example, if we first remove the (only) existing link-local 551 * address, and then reconfigure another one, the prefix is still 552 * valid with referring to the old link-local address. 553 */ 554 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 555 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 556 return (error); 557 } else 558 nd6_prefix_rele(pr); 559 560 return 0; 561 } 562 563 /* 564 * ifp - must be IFT_LOOP 565 */ 566 static int 567 in6_ifattach_loopback(struct ifnet *ifp) 568 { 569 struct in6_aliasreq ifra; 570 int error; 571 572 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 573 574 /* 575 * Always initialize ia_dstaddr (= broadcast address) to loopback 576 * address. Follows IPv4 practice - see in_ifinit(). 577 */ 578 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 579 ifra.ifra_dstaddr.sin6_family = AF_INET6; 580 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 581 582 /* the loopback address should NEVER expire. */ 583 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 584 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 585 586 /* 587 * We are sure that this is a newly assigned address, so we can set 588 * NULL to the 3rd arg. 589 */ 590 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 591 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 592 "the loopback address on %s (errno=%d)\n", 593 if_name(ifp), error)); 594 return (-1); 595 } 596 597 return 0; 598 } 599 600 /* 601 * compute NI group address, based on the current hostname setting. 602 * see RFC 4620. 603 * 604 * when ifp == NULL, the caller is responsible for filling scopeid. 605 * 606 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 607 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 608 */ 609 static int 610 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 611 struct in6_addr *in6, int oldmcprefix) 612 { 613 struct prison *pr; 614 const char *p; 615 u_char *q; 616 MD5_CTX ctxt; 617 u_int8_t digest[16]; 618 char l; 619 char n[64]; /* a single label must not exceed 63 chars */ 620 621 /* 622 * If no name is given and namelen is -1, 623 * we try to do the hostname lookup ourselves. 624 */ 625 if (!name && namelen == -1) { 626 pr = curthread->td_ucred->cr_prison; 627 mtx_lock(&pr->pr_mtx); 628 name = pr->pr_hostname; 629 namelen = strlen(name); 630 } else 631 pr = NULL; 632 if (!name || !namelen) { 633 if (pr != NULL) 634 mtx_unlock(&pr->pr_mtx); 635 return -1; 636 } 637 638 p = name; 639 while (p && *p && *p != '.' && p - name < namelen) 640 p++; 641 if (p == name || p - name > sizeof(n) - 1) { 642 if (pr != NULL) 643 mtx_unlock(&pr->pr_mtx); 644 return -1; /* label too long */ 645 } 646 l = p - name; 647 strncpy(n, name, l); 648 if (pr != NULL) 649 mtx_unlock(&pr->pr_mtx); 650 n[(int)l] = '\0'; 651 for (q = n; *q; q++) { 652 if ('A' <= *q && *q <= 'Z') 653 *q = *q - 'A' + 'a'; 654 } 655 656 /* generate 16 bytes of pseudo-random value. */ 657 bzero(&ctxt, sizeof(ctxt)); 658 MD5Init(&ctxt); 659 MD5Update(&ctxt, &l, sizeof(l)); 660 MD5Update(&ctxt, n, l); 661 MD5Final(digest, &ctxt); 662 663 bzero(in6, sizeof(*in6)); 664 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 665 in6->s6_addr8[11] = 2; 666 if (oldmcprefix == 0) { 667 in6->s6_addr8[12] = 0xff; 668 /* Copy the first 24 bits of 128-bit hash into the address. */ 669 bcopy(digest, &in6->s6_addr8[13], 3); 670 } else { 671 /* Copy the first 32 bits of 128-bit hash into the address. */ 672 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 673 } 674 if (in6_setscope(in6, ifp, NULL)) 675 return (-1); /* XXX: should not fail */ 676 677 return 0; 678 } 679 680 int 681 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 682 struct in6_addr *in6) 683 { 684 685 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 686 } 687 688 int 689 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 690 struct in6_addr *in6) 691 { 692 693 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 694 } 695 696 /* 697 * XXX multiple loopback interface needs more care. for instance, 698 * nodelocal address needs to be configured onto only one of them. 699 * XXX multiple link-local address case 700 * 701 * altifp - secondary EUI64 source 702 */ 703 void 704 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 705 { 706 struct in6_ifaddr *ia; 707 708 if (ifp->if_afdata[AF_INET6] == NULL) 709 return; 710 /* 711 * quirks based on interface type 712 */ 713 switch (ifp->if_type) { 714 case IFT_STF: 715 /* 716 * 6to4 interface is a very special kind of beast. 717 * no multicast, no linklocal. RFC2529 specifies how to make 718 * linklocals for 6to4 interface, but there's no use and 719 * it is rather harmful to have one. 720 */ 721 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 722 break; 723 default: 724 break; 725 } 726 727 /* 728 * usually, we require multicast capability to the interface 729 */ 730 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 731 nd6log((LOG_INFO, "in6_ifattach: " 732 "%s is not multicast capable, IPv6 not enabled\n", 733 if_name(ifp))); 734 return; 735 } 736 737 /* 738 * assign loopback address for loopback interface. 739 */ 740 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 741 /* 742 * check that loopback address doesn't exist yet. 743 */ 744 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0); 745 if (ia == NULL) 746 in6_ifattach_loopback(ifp); 747 else 748 ifa_free(&ia->ia_ifa); 749 } 750 751 /* 752 * assign a link-local address, if there's none. 753 */ 754 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 755 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 756 ia = in6ifa_ifpforlinklocal(ifp, 0); 757 if (ia == NULL) 758 in6_ifattach_linklocal(ifp, altifp); 759 else 760 ifa_free(&ia->ia_ifa); 761 } 762 763 /* update dynamically. */ 764 if (V_in6_maxmtu < ifp->if_mtu) 765 V_in6_maxmtu = ifp->if_mtu; 766 } 767 768 /* 769 * NOTE: in6_ifdetach() does not support loopback if at this moment. 770 * 771 * When shutting down a VNET we clean up layers top-down. In that case 772 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 773 * and we must not call into these cleanup functions anymore, thus purgeulp 774 * is set to 0 in that case by in6_ifdetach_destroy(). 775 * The normal case of destroying a (cloned) interface still needs to cleanup 776 * everything related to the interface and will have purgeulp set to 1. 777 */ 778 static void 779 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 780 { 781 struct ifaddr *ifa, *next; 782 783 if (ifp->if_afdata[AF_INET6] == NULL) 784 return; 785 786 /* 787 * nuke any of IPv6 addresses we have 788 * XXX: all addresses should be already removed 789 */ 790 TAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 791 if (ifa->ifa_addr->sa_family != AF_INET6) 792 continue; 793 in6_purgeaddr(ifa); 794 } 795 if (purgeulp) { 796 in6_pcbpurgeif0(&V_udbinfo, ifp); 797 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 798 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 799 } 800 /* leave from all multicast groups joined */ 801 in6_purgemaddrs(ifp); 802 803 /* 804 * Remove neighbor management table. 805 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 806 * teardown as the IPv6 layer is cleaned up already and the locks 807 * are destroyed. 808 */ 809 if (purgeulp) 810 nd6_purge(ifp); 811 } 812 813 void 814 in6_ifdetach(struct ifnet *ifp) 815 { 816 817 _in6_ifdetach(ifp, 1); 818 } 819 820 void 821 in6_ifdetach_destroy(struct ifnet *ifp) 822 { 823 824 _in6_ifdetach(ifp, 0); 825 } 826 827 int 828 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 829 const u_int8_t *baseid, int generate) 830 { 831 u_int8_t nullbuf[8]; 832 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 833 834 bzero(nullbuf, sizeof(nullbuf)); 835 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 836 /* we've never created a random ID. Create a new one. */ 837 generate = 1; 838 } 839 840 if (generate) { 841 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 842 843 /* generate_tmp_ifid will update seedn and buf */ 844 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 845 ndi->randomid); 846 } 847 bcopy(ndi->randomid, retbuf, 8); 848 849 return (0); 850 } 851 852 void 853 in6_tmpaddrtimer(void *arg) 854 { 855 CURVNET_SET((struct vnet *) arg); 856 struct nd_ifinfo *ndi; 857 u_int8_t nullbuf[8]; 858 struct ifnet *ifp; 859 860 callout_reset(&V_in6_tmpaddrtimer_ch, 861 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 862 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 863 864 bzero(nullbuf, sizeof(nullbuf)); 865 TAILQ_FOREACH(ifp, &V_ifnet, if_link) { 866 if (ifp->if_afdata[AF_INET6] == NULL) 867 continue; 868 ndi = ND_IFINFO(ifp); 869 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 870 /* 871 * We've been generating a random ID on this interface. 872 * Create a new one. 873 */ 874 (void)generate_tmp_ifid(ndi->randomseed0, 875 ndi->randomseed1, ndi->randomid); 876 } 877 } 878 879 CURVNET_RESTORE(); 880 } 881 882 static void 883 in6_purgemaddrs(struct ifnet *ifp) 884 { 885 LIST_HEAD(,in6_multi) purgeinms; 886 struct in6_multi *inm, *tinm; 887 struct ifmultiaddr *ifma; 888 889 LIST_INIT(&purgeinms); 890 IN6_MULTI_LOCK(); 891 892 /* 893 * Extract list of in6_multi associated with the detaching ifp 894 * which the PF_INET6 layer is about to release. 895 * We need to do this as IF_ADDR_LOCK() may be re-acquired 896 * by code further down. 897 */ 898 IF_ADDR_RLOCK(ifp); 899 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) { 900 if (ifma->ifma_addr->sa_family != AF_INET6 || 901 ifma->ifma_protospec == NULL) 902 continue; 903 inm = (struct in6_multi *)ifma->ifma_protospec; 904 LIST_INSERT_HEAD(&purgeinms, inm, in6m_entry); 905 } 906 IF_ADDR_RUNLOCK(ifp); 907 908 LIST_FOREACH_SAFE(inm, &purgeinms, in6m_entry, tinm) { 909 LIST_REMOVE(inm, in6m_entry); 910 in6m_release_locked(inm); 911 } 912 mld_ifdetach(ifp); 913 914 IN6_MULTI_UNLOCK(); 915 } 916 917 void 918 in6_ifattach_destroy(void) 919 { 920 921 callout_drain(&V_in6_tmpaddrtimer_ch); 922 } 923 924 static void 925 in6_ifattach_init(void *dummy) 926 { 927 928 /* Timer for regeneranation of temporary addresses randomize ID. */ 929 callout_init(&V_in6_tmpaddrtimer_ch, 0); 930 callout_reset(&V_in6_tmpaddrtimer_ch, 931 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 932 V_ip6_temp_regen_advance) * hz, 933 in6_tmpaddrtimer, curvnet); 934 } 935 936 /* 937 * Cheat. 938 * This must be after route_init(), which is now SI_ORDER_THIRD. 939 */ 940 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 941 in6_ifattach_init, NULL);
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