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 default: 332 NET_EPOCH_EXIT(et); 333 return -1; 334 } 335 336 /* sanity check: g bit must not indicate "group" */ 337 if (EUI64_GROUP(in6)) { 338 NET_EPOCH_EXIT(et); 339 return -1; 340 } 341 342 /* convert EUI64 into IPv6 interface identifier */ 343 EUI64_TO_IFID(in6); 344 345 /* 346 * sanity check: ifid must not be all zero, avoid conflict with 347 * subnet router anycast 348 */ 349 if ((in6->s6_addr[8] & ~(EUI64_GBIT | EUI64_UBIT)) == 0x00 && 350 bcmp(&in6->s6_addr[9], allzero, 7) == 0) { 351 NET_EPOCH_EXIT(et); 352 return -1; 353 } 354 355 NET_EPOCH_EXIT(et); 356 return 0; 357 } 358 359 /* 360 * Get interface identifier for the specified interface. If it is not 361 * available on ifp0, borrow interface identifier from other information 362 * sources. 363 * 364 * altifp - secondary EUI64 source 365 */ 366 static int 367 get_ifid(struct ifnet *ifp0, struct ifnet *altifp, 368 struct in6_addr *in6) 369 { 370 struct epoch_tracker et; 371 struct ifnet *ifp; 372 373 /* first, try to get it from the interface itself */ 374 if (in6_get_hw_ifid(ifp0, in6) == 0) { 375 nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n", 376 if_name(ifp0))); 377 goto success; 378 } 379 380 /* try secondary EUI64 source. this basically is for ATM PVC */ 381 if (altifp && in6_get_hw_ifid(altifp, in6) == 0) { 382 nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n", 383 if_name(ifp0), if_name(altifp))); 384 goto success; 385 } 386 387 /* next, try to get it from some other hardware interface */ 388 NET_EPOCH_ENTER(et); 389 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 390 if (ifp == ifp0) 391 continue; 392 if (in6_get_hw_ifid(ifp, in6) != 0) 393 continue; 394 395 /* 396 * to borrow ifid from other interface, ifid needs to be 397 * globally unique 398 */ 399 if (IFID_UNIVERSAL(in6)) { 400 nd6log((LOG_DEBUG, 401 "%s: borrow interface identifier from %s\n", 402 if_name(ifp0), if_name(ifp))); 403 NET_EPOCH_EXIT(et); 404 goto success; 405 } 406 } 407 NET_EPOCH_EXIT(et); 408 409 /* last resort: get from random number source */ 410 if (get_rand_ifid(ifp, in6) == 0) { 411 nd6log((LOG_DEBUG, 412 "%s: interface identifier generated by random number\n", 413 if_name(ifp0))); 414 goto success; 415 } 416 417 printf("%s: failed to get interface identifier\n", if_name(ifp0)); 418 return -1; 419 420 success: 421 nd6log((LOG_INFO, "%s: ifid: %02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n", 422 if_name(ifp0), in6->s6_addr[8], in6->s6_addr[9], in6->s6_addr[10], 423 in6->s6_addr[11], in6->s6_addr[12], in6->s6_addr[13], 424 in6->s6_addr[14], in6->s6_addr[15])); 425 return 0; 426 } 427 428 /* 429 * altifp - secondary EUI64 source 430 */ 431 static int 432 in6_ifattach_linklocal(struct ifnet *ifp, struct ifnet *altifp) 433 { 434 struct in6_ifaddr *ia; 435 struct in6_aliasreq ifra; 436 struct nd_prefixctl pr0; 437 struct nd_prefix *pr; 438 int error; 439 440 /* 441 * configure link-local address. 442 */ 443 in6_prepare_ifra(&ifra, NULL, &in6mask64); 444 445 ifra.ifra_addr.sin6_addr.s6_addr32[0] = htonl(0xfe800000); 446 ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0; 447 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 448 ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0; 449 ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1); 450 } else { 451 if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) { 452 nd6log((LOG_ERR, 453 "%s: no ifid available\n", if_name(ifp))); 454 return (-1); 455 } 456 } 457 if (in6_setscope(&ifra.ifra_addr.sin6_addr, ifp, NULL)) 458 return (-1); 459 460 /* link-local addresses should NEVER expire. */ 461 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 462 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 463 464 /* 465 * Now call in6_update_ifa() to do a bunch of procedures to configure 466 * a link-local address. We can set the 3rd argument to NULL, because 467 * we know there's no other link-local address on the interface 468 * and therefore we are adding one (instead of updating one). 469 */ 470 if ((error = in6_update_ifa(ifp, &ifra, NULL, 471 IN6_IFAUPDATE_DADDELAY)) != 0) { 472 /* 473 * XXX: When the interface does not support IPv6, this call 474 * would fail in the SIOCSIFADDR ioctl. I believe the 475 * notification is rather confusing in this case, so just 476 * suppress it. (jinmei@kame.net 20010130) 477 */ 478 if (error != EAFNOSUPPORT) 479 nd6log((LOG_NOTICE, "in6_ifattach_linklocal: failed to " 480 "configure a link-local address on %s " 481 "(errno=%d)\n", 482 if_name(ifp), error)); 483 return (-1); 484 } 485 486 ia = in6ifa_ifpforlinklocal(ifp, 0); 487 if (ia == NULL) { 488 /* 489 * Another thread removed the address that we just added. 490 * This should be rare, but it happens. 491 */ 492 nd6log((LOG_NOTICE, "%s: %s: new link-local address " 493 "disappeared\n", __func__, if_name(ifp))); 494 return (-1); 495 } 496 ifa_free(&ia->ia_ifa); 497 498 /* 499 * Make the link-local prefix (fe80::%link/64) as on-link. 500 * Since we'd like to manage prefixes separately from addresses, 501 * we make an ND6 prefix structure for the link-local prefix, 502 * and add it to the prefix list as a never-expire prefix. 503 * XXX: this change might affect some existing code base... 504 */ 505 bzero(&pr0, sizeof(pr0)); 506 pr0.ndpr_ifp = ifp; 507 /* this should be 64 at this moment. */ 508 pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL); 509 pr0.ndpr_prefix = ifra.ifra_addr; 510 /* apply the mask for safety. (nd6_prelist_add will apply it again) */ 511 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr, &in6mask64); 512 /* 513 * Initialize parameters. The link-local prefix must always be 514 * on-link, and its lifetimes never expire. 515 */ 516 pr0.ndpr_raf_onlink = 1; 517 pr0.ndpr_raf_auto = 1; /* probably meaningless */ 518 pr0.ndpr_vltime = ND6_INFINITE_LIFETIME; 519 pr0.ndpr_pltime = ND6_INFINITE_LIFETIME; 520 /* 521 * Since there is no other link-local addresses, nd6_prefix_lookup() 522 * probably returns NULL. However, we cannot always expect the result. 523 * For example, if we first remove the (only) existing link-local 524 * address, and then reconfigure another one, the prefix is still 525 * valid with referring to the old link-local address. 526 */ 527 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) { 528 if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0) 529 return (error); 530 } else 531 nd6_prefix_rele(pr); 532 533 return 0; 534 } 535 536 /* 537 * ifp - must be IFT_LOOP 538 */ 539 static int 540 in6_ifattach_loopback(struct ifnet *ifp) 541 { 542 struct in6_aliasreq ifra; 543 int error; 544 545 in6_prepare_ifra(&ifra, &in6addr_loopback, &in6mask128); 546 547 /* 548 * Always initialize ia_dstaddr (= broadcast address) to loopback 549 * address. Follows IPv4 practice - see in_ifinit(). 550 */ 551 ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6); 552 ifra.ifra_dstaddr.sin6_family = AF_INET6; 553 ifra.ifra_dstaddr.sin6_addr = in6addr_loopback; 554 555 /* the loopback address should NEVER expire. */ 556 ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME; 557 ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME; 558 559 /* 560 * We are sure that this is a newly assigned address, so we can set 561 * NULL to the 3rd arg. 562 */ 563 if ((error = in6_update_ifa(ifp, &ifra, NULL, 0)) != 0) { 564 nd6log((LOG_ERR, "in6_ifattach_loopback: failed to configure " 565 "the loopback address on %s (errno=%d)\n", 566 if_name(ifp), error)); 567 return (-1); 568 } 569 570 return 0; 571 } 572 573 /* 574 * compute NI group address, based on the current hostname setting. 575 * see RFC 4620. 576 * 577 * when ifp == NULL, the caller is responsible for filling scopeid. 578 * 579 * If oldmcprefix == 1, FF02:0:0:0:0:2::/96 is used for NI group address 580 * while it is FF02:0:0:0:0:2:FF00::/104 in RFC 4620. 581 */ 582 static int 583 in6_nigroup0(struct ifnet *ifp, const char *name, int namelen, 584 struct in6_addr *in6, int oldmcprefix) 585 { 586 struct prison *pr; 587 const char *p; 588 u_char *q; 589 MD5_CTX ctxt; 590 u_int8_t digest[16]; 591 char l; 592 char n[64]; /* a single label must not exceed 63 chars */ 593 594 /* 595 * If no name is given and namelen is -1, 596 * we try to do the hostname lookup ourselves. 597 */ 598 if (!name && namelen == -1) { 599 pr = curthread->td_ucred->cr_prison; 600 mtx_lock(&pr->pr_mtx); 601 name = pr->pr_hostname; 602 namelen = strlen(name); 603 } else 604 pr = NULL; 605 if (!name || !namelen) { 606 if (pr != NULL) 607 mtx_unlock(&pr->pr_mtx); 608 return -1; 609 } 610 611 p = name; 612 while (p && *p && *p != '.' && p - name < namelen) 613 p++; 614 if (p == name || p - name > sizeof(n) - 1) { 615 if (pr != NULL) 616 mtx_unlock(&pr->pr_mtx); 617 return -1; /* label too long */ 618 } 619 l = p - name; 620 strncpy(n, name, l); 621 if (pr != NULL) 622 mtx_unlock(&pr->pr_mtx); 623 n[(int)l] = '\0'; 624 for (q = n; *q; q++) { 625 if ('A' <= *q && *q <= 'Z') 626 *q = *q - 'A' + 'a'; 627 } 628 629 /* generate 16 bytes of pseudo-random value. */ 630 bzero(&ctxt, sizeof(ctxt)); 631 MD5Init(&ctxt); 632 MD5Update(&ctxt, &l, sizeof(l)); 633 MD5Update(&ctxt, n, l); 634 MD5Final(digest, &ctxt); 635 636 bzero(in6, sizeof(*in6)); 637 in6->s6_addr16[0] = IPV6_ADDR_INT16_MLL; 638 in6->s6_addr8[11] = 2; 639 if (oldmcprefix == 0) { 640 in6->s6_addr8[12] = 0xff; 641 /* Copy the first 24 bits of 128-bit hash into the address. */ 642 bcopy(digest, &in6->s6_addr8[13], 3); 643 } else { 644 /* Copy the first 32 bits of 128-bit hash into the address. */ 645 bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3])); 646 } 647 if (in6_setscope(in6, ifp, NULL)) 648 return (-1); /* XXX: should not fail */ 649 650 return 0; 651 } 652 653 int 654 in6_nigroup(struct ifnet *ifp, const char *name, int namelen, 655 struct in6_addr *in6) 656 { 657 658 return (in6_nigroup0(ifp, name, namelen, in6, 0)); 659 } 660 661 int 662 in6_nigroup_oldmcprefix(struct ifnet *ifp, const char *name, int namelen, 663 struct in6_addr *in6) 664 { 665 666 return (in6_nigroup0(ifp, name, namelen, in6, 1)); 667 } 668 669 /* 670 * XXX multiple loopback interface needs more care. for instance, 671 * nodelocal address needs to be configured onto only one of them. 672 * XXX multiple link-local address case 673 * 674 * altifp - secondary EUI64 source 675 */ 676 void 677 in6_ifattach(struct ifnet *ifp, struct ifnet *altifp) 678 { 679 struct in6_ifaddr *ia; 680 681 if (ifp->if_afdata[AF_INET6] == NULL) 682 return; 683 /* 684 * quirks based on interface type 685 */ 686 switch (ifp->if_type) { 687 case IFT_STF: 688 /* 689 * 6to4 interface is a very special kind of beast. 690 * no multicast, no linklocal. RFC2529 specifies how to make 691 * linklocals for 6to4 interface, but there's no use and 692 * it is rather harmful to have one. 693 */ 694 ND_IFINFO(ifp)->flags &= ~ND6_IFF_AUTO_LINKLOCAL; 695 break; 696 default: 697 break; 698 } 699 700 /* 701 * usually, we require multicast capability to the interface 702 */ 703 if ((ifp->if_flags & IFF_MULTICAST) == 0) { 704 nd6log((LOG_INFO, "in6_ifattach: " 705 "%s is not multicast capable, IPv6 not enabled\n", 706 if_name(ifp))); 707 return; 708 } 709 710 /* 711 * assign loopback address for loopback interface. 712 */ 713 if ((ifp->if_flags & IFF_LOOPBACK) != 0) { 714 /* 715 * check that loopback address doesn't exist yet. 716 */ 717 ia = in6ifa_ifwithaddr(&in6addr_loopback, 0); 718 if (ia == NULL) 719 in6_ifattach_loopback(ifp); 720 else 721 ifa_free(&ia->ia_ifa); 722 } 723 724 /* 725 * assign a link-local address, if there's none. 726 */ 727 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) && 728 ND_IFINFO(ifp)->flags & ND6_IFF_AUTO_LINKLOCAL) { 729 ia = in6ifa_ifpforlinklocal(ifp, 0); 730 if (ia == NULL) 731 in6_ifattach_linklocal(ifp, altifp); 732 else 733 ifa_free(&ia->ia_ifa); 734 } 735 736 /* update dynamically. */ 737 if (V_in6_maxmtu < ifp->if_mtu) 738 V_in6_maxmtu = ifp->if_mtu; 739 } 740 741 /* 742 * NOTE: in6_ifdetach() does not support loopback if at this moment. 743 * 744 * When shutting down a VNET we clean up layers top-down. In that case 745 * upper layer protocols (ulp) are cleaned up already and locks are destroyed 746 * and we must not call into these cleanup functions anymore, thus purgeulp 747 * is set to 0 in that case by in6_ifdetach_destroy(). 748 * The normal case of destroying a (cloned) interface still needs to cleanup 749 * everything related to the interface and will have purgeulp set to 1. 750 */ 751 static void 752 _in6_ifdetach(struct ifnet *ifp, int purgeulp) 753 { 754 struct ifaddr *ifa, *next; 755 756 if (ifp->if_afdata[AF_INET6] == NULL) 757 return; 758 759 /* 760 * nuke any of IPv6 addresses we have 761 */ 762 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, next) { 763 if (ifa->ifa_addr->sa_family != AF_INET6) 764 continue; 765 in6_purgeaddr(ifa); 766 } 767 if (purgeulp) { 768 in6_pcbpurgeif0(&V_udbinfo, ifp); 769 in6_pcbpurgeif0(&V_ulitecbinfo, ifp); 770 in6_pcbpurgeif0(&V_ripcbinfo, ifp); 771 } 772 /* leave from all multicast groups joined */ 773 in6_purgemaddrs(ifp); 774 775 /* 776 * Remove neighbor management table. 777 * Enabling the nd6_purge will panic on vmove for interfaces on VNET 778 * teardown as the IPv6 layer is cleaned up already and the locks 779 * are destroyed. 780 */ 781 if (purgeulp) 782 nd6_purge(ifp); 783 } 784 785 void 786 in6_ifdetach(struct ifnet *ifp) 787 { 788 789 _in6_ifdetach(ifp, 1); 790 } 791 792 void 793 in6_ifdetach_destroy(struct ifnet *ifp) 794 { 795 796 _in6_ifdetach(ifp, 0); 797 } 798 799 int 800 in6_get_tmpifid(struct ifnet *ifp, u_int8_t *retbuf, 801 const u_int8_t *baseid, int generate) 802 { 803 u_int8_t nullbuf[8]; 804 struct nd_ifinfo *ndi = ND_IFINFO(ifp); 805 806 bzero(nullbuf, sizeof(nullbuf)); 807 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) == 0) { 808 /* we've never created a random ID. Create a new one. */ 809 generate = 1; 810 } 811 812 if (generate) { 813 bcopy(baseid, ndi->randomseed1, sizeof(ndi->randomseed1)); 814 815 /* generate_tmp_ifid will update seedn and buf */ 816 (void)generate_tmp_ifid(ndi->randomseed0, ndi->randomseed1, 817 ndi->randomid); 818 } 819 bcopy(ndi->randomid, retbuf, 8); 820 821 return (0); 822 } 823 824 void 825 in6_tmpaddrtimer(void *arg) 826 { 827 CURVNET_SET((struct vnet *) arg); 828 struct nd_ifinfo *ndi; 829 u_int8_t nullbuf[8]; 830 struct ifnet *ifp; 831 832 callout_reset(&V_in6_tmpaddrtimer_ch, 833 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 834 V_ip6_temp_regen_advance) * hz, in6_tmpaddrtimer, curvnet); 835 836 bzero(nullbuf, sizeof(nullbuf)); 837 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) { 838 if (ifp->if_afdata[AF_INET6] == NULL) 839 continue; 840 ndi = ND_IFINFO(ifp); 841 if (bcmp(ndi->randomid, nullbuf, sizeof(nullbuf)) != 0) { 842 /* 843 * We've been generating a random ID on this interface. 844 * Create a new one. 845 */ 846 (void)generate_tmp_ifid(ndi->randomseed0, 847 ndi->randomseed1, ndi->randomid); 848 } 849 } 850 851 CURVNET_RESTORE(); 852 } 853 854 static void 855 in6_purgemaddrs(struct ifnet *ifp) 856 { 857 struct in6_multi_head inmh; 858 859 SLIST_INIT(&inmh); 860 IN6_MULTI_LOCK(); 861 IN6_MULTI_LIST_LOCK(); 862 mld_ifdetach(ifp, &inmh); 863 IN6_MULTI_LIST_UNLOCK(); 864 IN6_MULTI_UNLOCK(); 865 in6m_release_list_deferred(&inmh); 866 867 /* 868 * Make sure all multicast deletions invoking if_ioctl() are 869 * completed before returning. Else we risk accessing a freed 870 * ifnet structure pointer. 871 */ 872 in6m_release_wait(); 873 } 874 875 void 876 in6_ifattach_destroy(void) 877 { 878 879 callout_drain(&V_in6_tmpaddrtimer_ch); 880 } 881 882 static void 883 in6_ifattach_init(void *dummy) 884 { 885 886 /* Timer for regeneranation of temporary addresses randomize ID. */ 887 callout_init(&V_in6_tmpaddrtimer_ch, 0); 888 callout_reset(&V_in6_tmpaddrtimer_ch, 889 (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 890 V_ip6_temp_regen_advance) * hz, 891 in6_tmpaddrtimer, curvnet); 892 } 893 894 /* 895 * Cheat. 896 * This must be after route_init(), which is now SI_ORDER_THIRD. 897 */ 898 SYSINIT(in6_ifattach_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, 899 in6_ifattach_init, NULL); 900