1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * $KAME: in6_ifattach.c,v 1.118 2001/05/24 07:44:00 itojun Exp $ 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/malloc.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/jail.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/proc.h> 46 #include <sys/rmlock.h> 47 #include <sys/syslog.h> 48 #include <sys/md5.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_dl.h> 53 #include <net/if_types.h> 54 #include <net/route.h> 55 #include <net/vnet.h> 56 57 #include <netinet/in.h> 58 #include <netinet/in_var.h> 59 #include <netinet/if_ether.h> 60 #include <netinet/in_pcb.h> 61 #include <netinet/ip_var.h> 62 #include <netinet/udp.h> 63 #include <netinet/udp_var.h> 64 65 #include <netinet/ip6.h> 66 #include <netinet6/ip6_var.h> 67 #include <netinet6/in6_var.h> 68 #include <netinet6/in6_pcb.h> 69 #include <netinet6/in6_ifattach.h> 70 #include <netinet6/ip6_var.h> 71 #include <netinet6/nd6.h> 72 #include <netinet6/mld6_var.h> 73 #include <netinet6/scope6_var.h> 74 75 VNET_DEFINE(unsigned long, in6_maxmtu) = 0; 76 77 #ifdef IP6_AUTO_LINKLOCAL 78 VNET_DEFINE(int, ip6_auto_linklocal) = IP6_AUTO_LINKLOCAL; 79 #else 80 VNET_DEFINE(int, ip6_auto_linklocal) = 1; /* enabled by default */ 81 #endif 82 83 VNET_DEFINE(struct callout, in6_tmpaddrtimer_ch); 84 #define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 85 86 VNET_DECLARE(struct inpcbinfo, ripcbinfo); 87 #define V_ripcbinfo VNET(ripcbinfo) 88 89 static int get_rand_ifid(struct ifnet *, struct in6_addr *); 90 static int generate_tmp_ifid(u_int8_t *, const u_int8_t *, u_int8_t *); 91 static int get_ifid(struct ifnet *, struct ifnet *, struct in6_addr *); 92 static int in6_ifattach_linklocal(struct ifnet *, struct ifnet *); 93 static int in6_ifattach_loopback(struct ifnet *); 94 static void in6_purgemaddrs(struct ifnet *); 95 96 #define EUI64_GBIT 0x01 97 #define EUI64_UBIT 0x02 98 #define EUI64_TO_IFID(in6) do {(in6)->s6_addr[8] ^= EUI64_UBIT; } while (0) 99 #define EUI64_GROUP(in6) ((in6)->s6_addr[8] & EUI64_GBIT) 100 #define EUI64_INDIVIDUAL(in6) (!EUI64_GROUP(in6)) 101 #define EUI64_LOCAL(in6) ((in6)->s6_addr[8] & EUI64_UBIT) 102 #define EUI64_UNIVERSAL(in6) (!EUI64_LOCAL(in6)) 103 104 #define IFID_LOCAL(in6) (!EUI64_LOCAL(in6)) 105 #define IFID_UNIVERSAL(in6) (!EUI64_UNIVERSAL(in6)) 106 107 /* 108 * Generate a last-resort interface identifier, when the machine has no 109 * IEEE802/EUI64 address sources. 110 * The goal here is to get an interface identifier that is 111 * (1) random enough and (2) does not change across reboot. 112 * We currently use MD5(hostname) for it. 113 * 114 * in6 - upper 64bits are preserved 115 */ 116 static int 117 get_rand_ifid(struct ifnet *ifp, struct in6_addr *in6) 118 { 119 MD5_CTX ctxt; 120 struct prison *pr; 121 u_int8_t digest[16]; 122 int hostnamelen; 123 124 pr = curthread->td_ucred->cr_prison; 125 mtx_lock(&pr->pr_mtx); 126 hostnamelen = strlen(pr->pr_hostname); 127 #if 0 128 /* we need at least several letters as seed for ifid */ 129 if (hostnamelen < 3) { 130 mtx_unlock(&pr->pr_mtx); 131 return -1; 132 } 133 #endif 134 135 /* generate 8 bytes of pseudo-random value. */ 136 bzero(&ctxt, sizeof(ctxt)); 137 MD5Init(&ctxt); 138 MD5Update(&ctxt, pr->pr_hostname, hostnamelen); 139 mtx_unlock(&pr->pr_mtx); 140 MD5Final(digest, &ctxt); 141 142 /* assumes sizeof(digest) > sizeof(ifid) */ 143 bcopy(digest, &in6->s6_addr[8], 8); 144 145 /* make sure to set "u" bit to local, and "g" bit to individual. */ 146 in6->s6_addr[8] &= ~EUI64_GBIT; /* g bit to "individual" */ 147 in6->s6_addr[8] |= EUI64_UBIT; /* u bit to "local" */ 148 149 /* convert EUI64 into IPv6 interface identifier */ 150 EUI64_TO_IFID(in6); 151 152 return 0; 153 } 154 155 static int 156 generate_tmp_ifid(u_int8_t *seed0, const u_int8_t *seed1, u_int8_t *ret) 157 { 158 MD5_CTX ctxt; 159 u_int8_t seed[16], digest[16], nullbuf[8]; 160 u_int32_t val32; 161 162 /* If there's no history, start with a random seed. */ 163 bzero(nullbuf, sizeof(nullbuf)); 164 if (bcmp(nullbuf, seed0, sizeof(nullbuf)) == 0) { 165 int i; 166 167 for (i = 0; i < 2; i++) { 168 val32 = arc4random(); 169 bcopy(&val32, seed + sizeof(val32) * i, sizeof(val32)); 170 } 171 } else 172 bcopy(seed0, seed, 8); 173 174 /* copy the right-most 64-bits of the given address */ 175 /* XXX assumption on the size of IFID */ 176 bcopy(seed1, &seed[8], 8); 177 178 if (0) { /* for debugging purposes only */ 179 int i; 180 181 printf("generate_tmp_ifid: new randomized ID from: "); 182 for (i = 0; i < 16; i++) 183 printf("%02x", seed[i]); 184 printf(" "); 185 } 186 187 /* generate 16 bytes of pseudo-random value. */ 188 bzero(&ctxt, sizeof(ctxt)); 189 MD5Init(&ctxt); 190 MD5Update(&ctxt, seed, sizeof(seed)); 191 MD5Final(digest, &ctxt); 192 193 /* 194 * RFC 3041 3.2.1. (3) 195 * Take the left-most 64-bits of the MD5 digest and set bit 6 (the 196 * left-most bit is numbered 0) to zero. 197 */ 198 bcopy(digest, ret, 8); 199 ret[0] &= ~EUI64_UBIT; 200 201 /* 202 * XXX: we'd like to ensure that the generated value is not zero 203 * for simplicity. If the caclculated digest happens to be zero, 204 * use a random non-zero value as the last resort. 205 */ 206 if (bcmp(nullbuf, ret, sizeof(nullbuf)) == 0) { 207 nd6log((LOG_INFO, 208 "generate_tmp_ifid: computed MD5 value is zero.\n")); 209 210 val32 = arc4random(); 211 val32 = 1 + (val32 % (0xffffffff - 1)); 212 } 213 214 /* 215 * RFC 3041 3.2.1. (4) 216 * Take the rightmost 64-bits of the MD5 digest and save them in 217 * stable storage as the history value to be used in the next 218 * iteration of the algorithm. 219 */ 220 bcopy(&digest[8], seed0, 8); 221 222 if (0) { /* for debugging purposes only */ 223 int i; 224 225 printf("to: "); 226 for (i = 0; i < 16; i++) 227 printf("%02x", digest[i]); 228 printf("\n"); 229 } 230 231 return 0; 232 } 233 234 /* 235 * Get interface identifier for the specified interface. 236 * XXX assumes single sockaddr_dl (AF_LINK address) per an interface 237 * 238 * in6 - upper 64bits are preserved 239 */ 240 int 241 in6_get_hw_ifid(struct ifnet *ifp, struct in6_addr *in6) 242 { 243 struct epoch_tracker et; 244 struct ifaddr *ifa; 245 struct sockaddr_dl *sdl; 246 u_int8_t *addr; 247 size_t addrlen; 248 static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 249 static u_int8_t allone[8] = 250 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 251 252 NET_EPOCH_ENTER(et); 253 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 254 if (ifa->ifa_addr->sa_family != AF_LINK) 255 continue; 256 sdl = (struct sockaddr_dl *)ifa->ifa_addr; 257 if (sdl == NULL) 258 continue; 259 if (sdl->sdl_alen == 0) 260 continue; 261 262 goto found; 263 } 264 NET_EPOCH_EXIT(et); 265 266 return -1; 267 268 found: 269 IF_ADDR_LOCK_ASSERT(ifp); 270 addr = LLADDR(sdl); 271 addrlen = sdl->sdl_alen; 272 273 /* get EUI64 */ 274 switch (ifp->if_type) { 275 case IFT_BRIDGE: 276 case IFT_ETHER: 277 case IFT_L2VLAN: 278 case IFT_ATM: 279 case IFT_IEEE1394: 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 NET_EPOCH_EXIT(et); 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 NET_EPOCH_EXIT(et); 298 return -1; 299 } 300 if (bcmp(addr, allone, addrlen) == 0) { 301 NET_EPOCH_EXIT(et); 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_GIF: 321 case IFT_STF: 322 /* 323 * RFC2893 says: "SHOULD use IPv4 address as ifid source". 324 * however, IPv4 address is not very suitable as unique 325 * identifier source (can be renumbered). 326 * we don't do this. 327 */ 328 NET_EPOCH_EXIT(et); 329 return -1; 330 331 case IFT_INFINIBAND: 332 if (addrlen != 20) { 333 NET_EPOCH_EXIT(et); 334 return -1; 335 } 336 bcopy(addr + 12, &in6->s6_addr[8], 8); 337 break; 338 339 default: 340 NET_EPOCH_EXIT(et); 341 return -1; 342 } 343 344 /* sanity check: g bit must not indicate "group" */ 345 if (EUI64_GROUP(in6)) { 346 NET_EPOCH_EXIT(et); 347 return -1; 348 } 349 350 /* convert EUI64 into IPv6 interface identifier */ 351 EUI64_TO_IFID(in6); 352 353 /* 354 * sanity check: ifid must not be all zero, avoid conflict with 355 * subnet router anycast 356 */ 357 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 358 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 359 NET_EPOCH_EXIT(et); 360 return -1; 361 } 362 363 NET_EPOCH_EXIT(et); 364 return 0; 365 } 366 367 /* 368 * Get interface identifier for the specified interface. If it is not 369 * available on ifp0, borrow interface identifier from other information 370 * sources. 371 * 372 * altifp - secondary EUI64 source 373 */ 374 static int 375 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 376 struct in6_addr *in6) 377 { 378 struct epoch_tracker et; 379 struct ifnet *ifp; 380 381 /* first, try to get it from the interface itself */ 382 if (in6_get_hw_ifid(ifp0, in6) == 0) { 383 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 384 if_name(ifp0))); 385 goto success; 386 } 387 388 /* try secondary EUI64 source. this basically is for ATM PVC */ 389 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 390 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 391 if_name(ifp0), if_name(altifp))); 392 goto success; 393 } 394 395 /* next, try to get it from some other hardware interface */ 396 NET_EPOCH_ENTER(et); 397 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 398 if (ifp == ifp0) 399 continue; 400 if (in6_get_hw_ifid(ifp, in6) != 0) 401 continue; 402 403 /* 404 * to borrow ifid from other interface, ifid needs to be 405 * globally unique 406 */ 407 if (IFID_UNIVERSAL(in6)) { 408 nd6log((LOG_DEBUG, 409 "%s: borrow interface identifier from %s\n", 410 if_name(ifp0), if_name(ifp))); 411 NET_EPOCH_EXIT(et); 412 goto success; 413 } 414 } 415 NET_EPOCH_EXIT(et); 416 417 /* last resort: get from random number source */ 418 if (get_rand_ifid(ifp, in6) == 0) { 419 nd6log((LOG_DEBUG, 420 "%s: interface identifier generated by random number\n", 421 if_name(ifp0))); 422 goto success; 423 } 424 425 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 426 return -1; 427 428 success: 429 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 430 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 431 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 432 in6->s6_addr[14], in6->s6_addr[15])); 433 return 0; 434 } 435 436 /* 437 * altifp - secondary EUI64 source 438 */ 439 static int 440 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 441 { 442 struct in6_ifaddr *ia; 443 struct in6_aliasreq ifra; 444 struct nd_prefixctl pr0; 445 struct nd_prefix *pr; 446 int error; 447 448 /* 449 * configure link-local address. 450 */ 451 in6_prepare_ifra(&ifra, NULL, &in6mask64); 452 453 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 454 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 455 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 456 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 457 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 458 } else { 459 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 460 nd6log((LOG_ERR, 461 "%s: no ifid available\n", if_name(ifp))); 462 return (-1); 463 } 464 } 465 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 466 return (-1); 467 468 /* link-local addresses should NEVER expire. */ 469 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 470 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 471 472 /* 473 * Now call in6_update_ifa() to do a bunch of procedures to configure 474 * a link-local address. We can set the 3rd argument to NULL, because 475 * we know there's no other link-local address on the interface 476 * and therefore we are adding one (instead of updating one). 477 */ 478 if ((error = in6_update_ifa(ifp, &ifra, NULL, 479 IN6_IFAUPDATE_DADDELAY)) != 0) { 480 /* 481 * XXX: When the interface does not support IPv6, this call 482 * would fail in the SIOCSIFADDR ioctl. I believe the 483 * notification is rather confusing in this case, so just 484 * suppress it. (jinmei@kame.net 20010130) 485 */ 486 if (error != EAFNOSUPPORT) 487 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 488 "configure a link-local address on %s " 489 "(errno=%d)\n", 490 if_name(ifp), error)); 491 return (-1); 492 } 493 494 ia = in6ifa_ifpforlinklocal(ifp, 0); 495 if (ia == NULL) { 496 /* 497 * Another thread removed the address that we just added. 498 * This should be rare, but it happens. 499 */ 500 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 501 "disappeared\n", __func__, if_name(ifp))); 502 return (-1); 503 } 504 ifa_free(&ia->ia_ifa); 505 506 /* 507 * Make the link-local prefix (fe80::%link/64) as on-link. 508 * Since we'd like to manage prefixes separately from addresses, 509 * we make an ND6 prefix structure for the link-local prefix, 510 * and add it to the prefix list as a never-expire prefix. 511 * XXX: this change might affect some existing code base... 512 */ 513 bzero(&pr0, sizeof(pr0)); 514 pr0.ndpr_ifp = ifp; 515 /* this should be 64 at this moment. */ 516 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 517 pr0.ndpr_prefix = ifra.ifra_addr; 518 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 519 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 520 /* 521 * Initialize parameters. The link-local prefix must always be 522 * on-link, and its lifetimes never expire. 523 */ 524 pr0.ndpr_raf_onlink = 1; 525 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 526 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 527 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 528 /* 529 * Since there is no other link-local addresses, nd6_prefix_lookup() 530 * probably returns NULL. However, we cannot always expect the result. 531 * For example, if we first remove the (only) existing link-local 532 * address, and then reconfigure another one, the prefix is still 533 * valid with referring to the old link-local address. 534 */ 535 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 536 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 537 return (error); 538 } else 539 nd6_prefix_rele(pr); 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 /* 568 * We are sure that this is a newly assigned address, so we can set 569 * NULL to the 3rd arg. 570 */ 571 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 572 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 573 "the loopback address on %s (errno=%d)\n", 574 if_name(ifp), error)); 575 return (-1); 576 } 577 578 return 0; 579 } 580 581 /* 582 * compute NI group address, based on the current hostname setting. 583 * see RFC 4620. 584 * 585 * when ifp == NULL, the caller is responsible for filling scopeid. 586 * 587 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 588 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 589 */ 590 static int 591 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 592 struct in6_addr *in6, int oldmcprefix) 593 { 594 struct prison *pr; 595 const char *p; 596 u_char *q; 597 MD5_CTX ctxt; 598 u_int8_t digest[16]; 599 char l; 600 char n[64]; /* a single label must not exceed 63 chars */ 601 602 /* 603 * If no name is given and namelen is -1, 604 * we try to do the hostname lookup ourselves. 605 */ 606 if (!name && namelen == -1) { 607 pr = curthread->td_ucred->cr_prison; 608 mtx_lock(&pr->pr_mtx); 609 name = pr->pr_hostname; 610 namelen = strlen(name); 611 } else 612 pr = NULL; 613 if (!name || !namelen) { 614 if (pr != NULL) 615 mtx_unlock(&pr->pr_mtx); 616 return -1; 617 } 618 619 p = name; 620 while (p && *p && *p != '.' && p - name < namelen) 621 p++; 622 if (p == name || p - name > sizeof(n) - 1) { 623 if (pr != NULL) 624 mtx_unlock(&pr->pr_mtx); 625 return -1; /* label too long */ 626 } 627 l = p - name; 628 strncpy(n, name, l); 629 if (pr != NULL) 630 mtx_unlock(&pr->pr_mtx); 631 n[(int)l] = '\0'; 632 for (q = n; *q; q++) { 633 if ('A' <= *q && *q <= 'Z') 634 *q = *q - 'A' + 'a'; 635 } 636 637 /* generate 16 bytes of pseudo-random value. */ 638 bzero(&ctxt, sizeof(ctxt)); 639 MD5Init(&ctxt); 640 MD5Update(&ctxt, &l, sizeof(l)); 641 MD5Update(&ctxt, n, l); 642 MD5Final(digest, &ctxt); 643 644 bzero(in6, sizeof(*in6)); 645 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 646 in6->s6_addr8[11] = 2; 647 if (oldmcprefix == 0) { 648 in6->s6_addr8[12] = 0xff; 649 /* Copy the first 24 bits of 128-bit hash into the address. */ 650 bcopy(digest, &in6->s6_addr8[13], 3); 651 } else { 652 /* Copy the first 32 bits of 128-bit hash into the address. */ 653 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 654 } 655 if (in6_setscope(in6, ifp, NULL)) 656 return (-1); /* XXX: should not fail */ 657 658 return 0; 659 } 660 661 int 662 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 663 struct in6_addr *in6) 664 { 665 666 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 667 } 668 669 int 670 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 671 struct in6_addr *in6) 672 { 673 674 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 675 } 676 677 /* 678 * XXX multiple loopback interface needs more care. for instance, 679 * nodelocal address needs to be configured onto only one of them. 680 * XXX multiple link-local address case 681 * 682 * altifp - secondary EUI64 source 683 */ 684 void 685 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 686 { 687 struct in6_ifaddr *ia; 688 689 if (ifp->if_afdata[AF_INET6] == NULL) 690 return; 691 /* 692 * quirks based on interface type 693 */ 694 switch (ifp->if_type) { 695 case IFT_STF: 696 /* 697 * 6to4 interface is a very special kind of beast. 698 * no multicast, no linklocal. RFC2529 specifies how to make 699 * linklocals for 6to4 interface, but there's no use and 700 * it is rather harmful to have one. 701 */ 702 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 703 ND_IFINFO(ifp)->flags |= ND6_IFF_NO_DAD; 704 break; 705 default: 706 break; 707 } 708 709 /* 710 * usually, we require multicast capability to the interface 711 */ 712 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 713 nd6log((LOG_INFO, "in6_ifattach: " 714 "%s is not multicast capable, IPv6 not enabled\n", 715 if_name(ifp))); 716 return; 717 } 718 719 /* 720 * assign loopback address for loopback interface. 721 */ 722 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 723 /* 724 * check that loopback address doesn't exist yet. 725 */ 726 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0); 727 if (ia == NULL) 728 in6_ifattach_loopback(ifp); 729 else 730 ifa_free(&ia->ia_ifa); 731 } 732 733 /* 734 * assign a link-local address, if there's none. 735 */ 736 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 737 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 738 ia = in6ifa_ifpforlinklocal(ifp, 0); 739 if (ia == NULL) 740 in6_ifattach_linklocal(ifp, altifp); 741 else 742 ifa_free(&ia->ia_ifa); 743 } 744 745 /* update dynamically. */ 746 if (V_in6_maxmtu < ifp->if_mtu) 747 V_in6_maxmtu = ifp->if_mtu; 748 } 749 750 /* 751 * NOTE: in6_ifdetach() does not support loopback if at this moment. 752 * 753 * When shutting down a VNET we clean up layers top-down. In that case 754 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 755 * and we must not call into these cleanup functions anymore, thus purgeulp 756 * is set to 0 in that case by in6_ifdetach_destroy(). 757 * The normal case of destroying a (cloned) interface still needs to cleanup 758 * everything related to the interface and will have purgeulp set to 1. 759 */ 760 static void 761 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 762 { 763 struct ifaddr *ifa, *next; 764 765 if (ifp->if_afdata[AF_INET6] == NULL) 766 return; 767 768 /* 769 * nuke any of IPv6 addresses we have 770 */ 771 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 772 if (ifa->ifa_addr->sa_family != AF_INET6) 773 continue; 774 in6_purgeaddr(ifa); 775 } 776 if (purgeulp) { 777 IN6_MULTI_LOCK(); 778 in6_pcbpurgeif0(&V_udbinfo, ifp); 779 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 780 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 781 IN6_MULTI_UNLOCK(); 782 } 783 /* leave from all multicast groups joined */ 784 in6_purgemaddrs(ifp); 785 786 /* 787 * Remove neighbor management table. 788 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 789 * teardown as the IPv6 layer is cleaned up already and the locks 790 * are destroyed. 791 */ 792 if (purgeulp) 793 nd6_purge(ifp); 794 } 795 796 void 797 in6_ifdetach(struct ifnet *ifp) 798 { 799 800 _in6_ifdetach(ifp, 1); 801 } 802 803 void 804 in6_ifdetach_destroy(struct ifnet *ifp) 805 { 806 807 _in6_ifdetach(ifp, 0); 808 } 809 810 int 811 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 812 const u_int8_t *baseid, int generate) 813 { 814 u_int8_t nullbuf[8]; 815 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 816 817 bzero(nullbuf, sizeof(nullbuf)); 818 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 819 /* we've never created a random ID. Create a new one. */ 820 generate = 1; 821 } 822 823 if (generate) { 824 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 825 826 /* generate_tmp_ifid will update seedn and buf */ 827 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 828 ndi->randomid); 829 } 830 bcopy(ndi->randomid, retbuf, 8); 831 832 return (0); 833 } 834 835 void 836 in6_tmpaddrtimer(void *arg) 837 { 838 CURVNET_SET((struct vnet *) arg); 839 struct nd_ifinfo *ndi; 840 u_int8_t nullbuf[8]; 841 struct ifnet *ifp; 842 843 callout_reset(&V_in6_tmpaddrtimer_ch, 844 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 845 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 846 847 bzero(nullbuf, sizeof(nullbuf)); 848 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 849 if (ifp->if_afdata[AF_INET6] == NULL) 850 continue; 851 ndi = ND_IFINFO(ifp); 852 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 853 /* 854 * We've been generating a random ID on this interface. 855 * Create a new one. 856 */ 857 (void)generate_tmp_ifid(ndi->randomseed0, 858 ndi->randomseed1, ndi->randomid); 859 } 860 } 861 862 CURVNET_RESTORE(); 863 } 864 865 static void 866 in6_purgemaddrs(struct ifnet *ifp) 867 { 868 struct in6_multi_head inmh; 869 870 SLIST_INIT(&inmh); 871 IN6_MULTI_LOCK(); 872 IN6_MULTI_LIST_LOCK(); 873 mld_ifdetach(ifp, &inmh); 874 IN6_MULTI_LIST_UNLOCK(); 875 IN6_MULTI_UNLOCK(); 876 in6m_release_list_deferred(&inmh); 877 878 /* 879 * Make sure all multicast deletions invoking if_ioctl() are 880 * completed before returning. Else we risk accessing a freed 881 * ifnet structure pointer. 882 */ 883 in6m_release_wait(); 884 } 885 886 void 887 in6_ifattach_destroy(void) 888 { 889 890 callout_drain(&V_in6_tmpaddrtimer_ch); 891 } 892 893 static void 894 in6_ifattach_init(void *dummy) 895 { 896 897 /* Timer for regeneranation of temporary addresses randomize ID. */ 898 callout_init(&V_in6_tmpaddrtimer_ch, 0); 899 callout_reset(&V_in6_tmpaddrtimer_ch, 900 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 901 V_ip6_temp_regen_advance) * hz, 902 in6_tmpaddrtimer, curvnet); 903 } 904 905 /* 906 * Cheat. 907 * This must be after route_init(), which is now SI_ORDER_THIRD. 908 */ 909 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 910 in6_ifattach_init, NULL); 911