1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2019 Roy Marples <roy@marples.name> 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/types.h> 31 #include <sys/socket.h> 32 #include <sys/stat.h> 33 34 #include <arpa/inet.h> 35 #include <net/if.h> 36 #include <net/route.h> 37 #include <netinet/in.h> 38 #include <netinet/if_ether.h> 39 40 #include "config.h" 41 42 #ifdef HAVE_SYS_BITOPS_H 43 #include <sys/bitops.h> 44 #else 45 #include "compat/bitops.h" 46 #endif 47 48 #ifdef BSD 49 /* Purely for the ND6_IFF_AUTO_LINKLOCAL #define which is solely used 50 * to generate our CAN_ADD_LLADDR #define. */ 51 # include <netinet6/in6_var.h> 52 # include <netinet6/nd6.h> 53 #endif 54 55 #include <errno.h> 56 #include <ifaddrs.h> 57 #include <inttypes.h> 58 #include <stdlib.h> 59 #include <string.h> 60 #include <unistd.h> 61 62 #define ELOOP_QUEUE 7 63 #include "common.h" 64 #include "if.h" 65 #include "dhcpcd.h" 66 #include "dhcp6.h" 67 #include "eloop.h" 68 #include "ipv6.h" 69 #include "ipv6nd.h" 70 #include "logerr.h" 71 #include "sa.h" 72 #include "script.h" 73 74 #ifdef HAVE_MD5_H 75 # ifndef DEPGEN 76 # include <md5.h> 77 # endif 78 #endif 79 80 #ifdef SHA2_H 81 # include SHA2_H 82 #endif 83 84 #ifndef SHA256_DIGEST_LENGTH 85 # define SHA256_DIGEST_LENGTH 32 86 #endif 87 88 #ifdef IPV6_POLLADDRFLAG 89 # warning kernel does not report IPv6 address flag changes 90 # warning polling tentative address flags periodically 91 #endif 92 93 /* Hackery at it's finest. */ 94 #ifndef s6_addr32 95 # ifdef __sun 96 # define s6_addr32 _S6_un._S6_u32 97 # else 98 # define s6_addr32 __u6_addr.__u6_addr32 99 # endif 100 #endif 101 102 #if defined(HAVE_IN6_ADDR_GEN_MODE_NONE) || defined(ND6_IFF_AUTO_LINKLOCAL) || \ 103 defined(IFF_NOLINKLOCAL) 104 /* Only add the LL address if we have a carrier, so DaD works. */ 105 #define CAN_ADD_LLADDR(ifp) \ 106 (!((ifp)->options->options & DHCPCD_LINK) || (ifp)->carrier != LINK_DOWN) 107 #ifdef __sun 108 /* Although we can add our own LL address, we cannot drop it 109 * without unplumbing the if which is a lot of code. 110 * So just keep it for the time being. */ 111 #define CAN_DROP_LLADDR(ifp) (0) 112 #else 113 #define CAN_DROP_LLADDR(ifp) (1) 114 #endif 115 #else 116 /* We have no control over the OS adding the LLADDR, so just let it do it 117 * as we cannot force our own view on it. */ 118 #define CAN_ADD_LLADDR(ifp) (0) 119 #define CAN_DROP_LLADDR(ifp) (0) 120 #endif 121 122 #ifdef IPV6_MANAGETEMPADDR 123 static void ipv6_regentempifid(void *); 124 static void ipv6_regentempaddr(void *); 125 #else 126 #define ipv6_regentempifid(a) {} 127 #endif 128 129 int 130 ipv6_init(struct dhcpcd_ctx *ctx) 131 { 132 133 if (ctx->ra_routers != NULL) 134 return 0; 135 136 ctx->ra_routers = malloc(sizeof(*ctx->ra_routers)); 137 if (ctx->ra_routers == NULL) 138 return -1; 139 TAILQ_INIT(ctx->ra_routers); 140 141 #ifndef __sun 142 ctx->nd_fd = -1; 143 #endif 144 ctx->dhcp6_fd = -1; 145 return 0; 146 } 147 148 static ssize_t 149 ipv6_readsecret(struct dhcpcd_ctx *ctx) 150 { 151 FILE *fp; 152 char line[1024]; 153 unsigned char *p; 154 size_t len; 155 uint32_t r; 156 int x; 157 158 if ((ctx->secret_len = read_hwaddr_aton(&ctx->secret, SECRET)) != 0) 159 return (ssize_t)ctx->secret_len; 160 161 if (errno != ENOENT) 162 logerr("%s: %s", __func__, SECRET); 163 164 /* Chaining arc4random should be good enough. 165 * RFC7217 section 5.1 states the key SHOULD be at least 128 bits. 166 * To attempt and future proof ourselves, we'll generate a key of 167 * 512 bits (64 bytes). */ 168 if (ctx->secret_len < 64) { 169 if ((ctx->secret = malloc(64)) == NULL) { 170 logerr(__func__); 171 return -1; 172 } 173 ctx->secret_len = 64; 174 } 175 p = ctx->secret; 176 for (len = 0; len < 512 / NBBY; len += sizeof(r)) { 177 r = arc4random(); 178 memcpy(p, &r, sizeof(r)); 179 p += sizeof(r); 180 } 181 182 /* Ensure that only the dhcpcd user can read the secret. 183 * Write permission is also denied as chaning it would remove 184 * it's stability. */ 185 if ((fp = fopen(SECRET, "w")) == NULL || 186 chmod(SECRET, S_IRUSR) == -1) 187 goto eexit; 188 x = fprintf(fp, "%s\n", 189 hwaddr_ntoa(ctx->secret, ctx->secret_len, line, sizeof(line))); 190 if (fclose(fp) == EOF) 191 x = -1; 192 fp = NULL; 193 if (x > 0) 194 return (ssize_t)ctx->secret_len; 195 196 eexit: 197 logerr("%s: %s", __func__, SECRET); 198 if (fp != NULL) 199 fclose(fp); 200 unlink(SECRET); 201 ctx->secret_len = 0; 202 return -1; 203 } 204 205 /* http://www.iana.org/assignments/ipv6-interface-ids/ipv6-interface-ids.xhtml 206 * RFC5453 */ 207 static const struct reslowhigh { 208 const uint8_t high[8]; 209 const uint8_t low[8]; 210 } reslowhigh[] = { 211 /* RFC4291 + RFC6543 */ 212 { { 0x02, 0x00, 0x5e, 0xff, 0xfe, 0x00, 0x00, 0x00 }, 213 { 0x02, 0x00, 0x5e, 0xff, 0xfe, 0xff, 0xff, 0xff } }, 214 /* RFC2526 */ 215 { { 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 }, 216 { 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff } } 217 }; 218 219 static int 220 ipv6_reserved(const struct in6_addr *addr) 221 { 222 uint64_t id, low, high; 223 size_t i; 224 const struct reslowhigh *r; 225 226 id = be64dec(addr->s6_addr + sizeof(id)); 227 if (id == 0) /* RFC4291 */ 228 return 1; 229 for (i = 0; i < sizeof(reslowhigh) / sizeof(reslowhigh[0]); i++) { 230 r = &reslowhigh[i]; 231 low = be64dec(r->low); 232 high = be64dec(r->high); 233 if (id >= low && id <= high) 234 return 1; 235 } 236 return 0; 237 } 238 239 /* RFC7217 */ 240 static int 241 ipv6_makestableprivate1(struct in6_addr *addr, 242 const struct in6_addr *prefix, int prefix_len, 243 const unsigned char *netiface, size_t netiface_len, 244 const unsigned char *netid, size_t netid_len, 245 unsigned short vlanid, 246 uint32_t *dad_counter, 247 const unsigned char *secret, size_t secret_len) 248 { 249 unsigned char buf[2048], *p, digest[SHA256_DIGEST_LENGTH]; 250 size_t len, l; 251 SHA256_CTX ctx; 252 253 if (prefix_len < 0 || prefix_len > 120) { 254 errno = EINVAL; 255 return -1; 256 } 257 258 l = (size_t)(ROUNDUP8(prefix_len) / NBBY); 259 len = l + netiface_len + netid_len + sizeof(*dad_counter) + secret_len; 260 if (vlanid != 0) 261 len += sizeof(vlanid); 262 if (len > sizeof(buf)) { 263 errno = ENOBUFS; 264 return -1; 265 } 266 267 for (;; (*dad_counter)++) { 268 /* Combine all parameters into one buffer */ 269 p = buf; 270 memcpy(p, prefix, l); 271 p += l; 272 memcpy(p, netiface, netiface_len); 273 p += netiface_len; 274 memcpy(p, netid, netid_len); 275 p += netid_len; 276 /* Don't use a vlanid if not set. 277 * This ensures prior versions have the same unique address. */ 278 if (vlanid != 0) { 279 memcpy(p, &vlanid, sizeof(vlanid)); 280 p += sizeof(vlanid); 281 } 282 memcpy(p, dad_counter, sizeof(*dad_counter)); 283 p += sizeof(*dad_counter); 284 memcpy(p, secret, secret_len); 285 286 /* Make an address using the digest of the above. 287 * RFC7217 Section 5.1 states that we shouldn't use MD5. 288 * Pity as we use that for HMAC-MD5 which is still deemed OK. 289 * SHA-256 is recommended */ 290 SHA256_Init(&ctx); 291 SHA256_Update(&ctx, buf, len); 292 SHA256_Final(digest, &ctx); 293 294 p = addr->s6_addr; 295 memcpy(p, prefix, l); 296 /* RFC7217 section 5.2 says we need to start taking the id from 297 * the least significant bit */ 298 len = sizeof(addr->s6_addr) - l; 299 memcpy(p + l, digest + (sizeof(digest) - len), len); 300 301 /* Ensure that the Interface ID does not match a reserved one, 302 * if it does then treat it as a DAD failure. 303 * RFC7217 section 5.2 */ 304 if (prefix_len != 64) 305 break; 306 if (!ipv6_reserved(addr)) 307 break; 308 } 309 310 return 0; 311 } 312 313 int 314 ipv6_makestableprivate(struct in6_addr *addr, 315 const struct in6_addr *prefix, int prefix_len, 316 const struct interface *ifp, 317 int *dad_counter) 318 { 319 uint32_t dad; 320 int r; 321 322 if (ifp->ctx->secret_len == 0) { 323 if (ipv6_readsecret(ifp->ctx) == -1) 324 return -1; 325 } 326 327 dad = (uint32_t)*dad_counter; 328 329 /* For our implementation, we shall set the hardware address 330 * as the interface identifier */ 331 r = ipv6_makestableprivate1(addr, prefix, prefix_len, 332 ifp->hwaddr, ifp->hwlen, 333 ifp->ssid, ifp->ssid_len, 334 ifp->vlanid, &dad, 335 ifp->ctx->secret, ifp->ctx->secret_len); 336 337 if (r == 0) 338 *dad_counter = (int)dad; 339 return r; 340 } 341 342 int 343 ipv6_makeaddr(struct in6_addr *addr, struct interface *ifp, 344 const struct in6_addr *prefix, int prefix_len) 345 { 346 const struct ipv6_addr *ap; 347 int dad; 348 349 if (prefix_len < 0 || prefix_len > 120) { 350 errno = EINVAL; 351 return -1; 352 } 353 354 if (ifp->options->options & DHCPCD_SLAACPRIVATE) { 355 dad = 0; 356 if (ipv6_makestableprivate(addr, 357 prefix, prefix_len, ifp, &dad) == -1) 358 return -1; 359 return dad; 360 } 361 362 if (prefix_len > 64) { 363 errno = EINVAL; 364 return -1; 365 } 366 if ((ap = ipv6_linklocal(ifp)) == NULL) { 367 /* We delay a few functions until we get a local-link address 368 * so this should never be hit. */ 369 errno = ENOENT; 370 return -1; 371 } 372 373 /* Make the address from the first local-link address */ 374 memcpy(addr, prefix, sizeof(*prefix)); 375 addr->s6_addr32[2] = ap->addr.s6_addr32[2]; 376 addr->s6_addr32[3] = ap->addr.s6_addr32[3]; 377 return 0; 378 } 379 380 static int 381 ipv6_makeprefix(struct in6_addr *prefix, const struct in6_addr *addr, int len) 382 { 383 int bytes, bits; 384 385 if (len < 0 || len > 128) { 386 errno = EINVAL; 387 return -1; 388 } 389 390 bytes = len / NBBY; 391 bits = len % NBBY; 392 memcpy(&prefix->s6_addr, &addr->s6_addr, (size_t)bytes); 393 if (bits != 0) { 394 /* Coverify false positive. 395 * bytelen cannot be 16 if bitlen is non zero */ 396 /* coverity[overrun-local] */ 397 prefix->s6_addr[bytes] = 398 (uint8_t)(prefix->s6_addr[bytes] >> (NBBY - bits)); 399 } 400 memset((char *)prefix->s6_addr + bytes, 0, 401 sizeof(prefix->s6_addr) - (size_t)bytes); 402 return 0; 403 } 404 405 int 406 ipv6_mask(struct in6_addr *mask, int len) 407 { 408 static const unsigned char masks[NBBY] = 409 { 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff }; 410 int bytes, bits, i; 411 412 if (len < 0 || len > 128) { 413 errno = EINVAL; 414 return -1; 415 } 416 417 memset(mask, 0, sizeof(*mask)); 418 bytes = len / NBBY; 419 bits = len % NBBY; 420 for (i = 0; i < bytes; i++) 421 mask->s6_addr[i] = 0xff; 422 if (bits != 0) { 423 /* Coverify false positive. 424 * bytelen cannot be 16 if bitlen is non zero */ 425 /* coverity[overrun-local] */ 426 mask->s6_addr[bytes] = masks[bits - 1]; 427 } 428 return 0; 429 } 430 431 uint8_t 432 ipv6_prefixlen(const struct in6_addr *mask) 433 { 434 int x = 0, y; 435 const unsigned char *lim, *p; 436 437 lim = (const unsigned char *)mask + sizeof(*mask); 438 for (p = (const unsigned char *)mask; p < lim; x++, p++) { 439 if (*p != 0xff) 440 break; 441 } 442 y = 0; 443 if (p < lim) { 444 for (y = 0; y < NBBY; y++) { 445 if ((*p & (0x80 >> y)) == 0) 446 break; 447 } 448 } 449 450 /* 451 * when the limit pointer is given, do a stricter check on the 452 * remaining bits. 453 */ 454 if (p < lim) { 455 if (y != 0 && (*p & (0x00ff >> y)) != 0) 456 return 0; 457 for (p = p + 1; p < lim; p++) 458 if (*p != 0) 459 return 0; 460 } 461 462 return (uint8_t)(x * NBBY + y); 463 } 464 465 static void 466 in6_to_h64(uint64_t *vhigh, uint64_t *vlow, const struct in6_addr *addr) 467 { 468 469 *vhigh = be64dec(addr->s6_addr); 470 *vlow = be64dec(addr->s6_addr + 8); 471 } 472 473 static void 474 h64_to_in6(struct in6_addr *addr, uint64_t vhigh, uint64_t vlow) 475 { 476 477 be64enc(addr->s6_addr, vhigh); 478 be64enc(addr->s6_addr + 8, vlow); 479 } 480 481 int 482 ipv6_userprefix( 483 const struct in6_addr *prefix, // prefix from router 484 short prefix_len, // length of prefix received 485 uint64_t user_number, // "random" number from user 486 struct in6_addr *result, // resultant prefix 487 short result_len) // desired prefix length 488 { 489 uint64_t vh, vl, user_low, user_high; 490 491 if (prefix_len < 1 || prefix_len > 128 || 492 result_len < 1 || result_len > 128) 493 { 494 errno = EINVAL; 495 return -1; 496 } 497 498 /* Check that the user_number fits inside result_len less prefix_len */ 499 if (result_len < prefix_len || 500 fls64(user_number) > result_len - prefix_len) 501 { 502 errno = ERANGE; 503 return -1; 504 } 505 506 /* If user_number is zero, just copy the prefix into the result. */ 507 if (user_number == 0) { 508 *result = *prefix; 509 return 0; 510 } 511 512 /* Shift user_number so it fit's just inside result_len. 513 * Shifting by 0 or sizeof(user_number) is undefined, 514 * so we cater for that. */ 515 if (result_len == 128) { 516 user_high = 0; 517 user_low = user_number; 518 } else if (result_len > 64) { 519 if (prefix_len >= 64) 520 user_high = 0; 521 else 522 user_high = user_number >> (result_len - prefix_len); 523 user_low = user_number << (128 - result_len); 524 } else if (result_len == 64) { 525 user_high = user_number; 526 user_low = 0; 527 } else { 528 user_high = user_number << (64 - result_len); 529 user_low = 0; 530 } 531 532 /* convert to two 64bit host order values */ 533 in6_to_h64(&vh, &vl, prefix); 534 535 vh |= user_high; 536 vl |= user_low; 537 538 /* copy back result */ 539 h64_to_in6(result, vh, vl); 540 541 return 0; 542 } 543 544 #ifdef IPV6_POLLADDRFLAG 545 void 546 ipv6_checkaddrflags(void *arg) 547 { 548 struct ipv6_addr *ia; 549 int flags; 550 const char *alias; 551 552 ia = arg; 553 #ifdef ALIAS_ADDR 554 alias = ia->alias; 555 #else 556 alias = NULL; 557 #endif 558 if ((flags = if_addrflags6(ia->iface, &ia->addr, alias)) == -1) { 559 if (errno != EEXIST && errno != EADDRNOTAVAIL) 560 logerr("%s: if_addrflags6", __func__); 561 return; 562 } 563 564 if (!(flags & IN6_IFF_TENTATIVE)) { 565 /* Simulate the kernel announcing the new address. */ 566 ipv6_handleifa(ia->iface->ctx, RTM_NEWADDR, 567 ia->iface->ctx->ifaces, ia->iface->name, 568 &ia->addr, ia->prefix_len, flags, 0); 569 } else { 570 /* Still tentative? Check again in a bit. */ 571 struct timespec tv; 572 573 ms_to_ts(&tv, RETRANS_TIMER / 2); 574 eloop_timeout_add_tv(ia->iface->ctx->eloop, &tv, 575 ipv6_checkaddrflags, ia); 576 } 577 } 578 #endif 579 580 static void 581 ipv6_deletedaddr(struct ipv6_addr *ia) 582 { 583 584 #ifdef SMALL 585 UNUSED(ia); 586 #else 587 /* NOREJECT is set if we delegated exactly the prefix to another 588 * address. 589 * This can only be one address, so just clear the flag. 590 * This should ensure the reject route will be restored. */ 591 if (ia->delegating_prefix != NULL) 592 ia->delegating_prefix->flags &= ~IPV6_AF_NOREJECT; 593 #endif 594 } 595 596 void 597 ipv6_deleteaddr(struct ipv6_addr *ia) 598 { 599 struct ipv6_state *state; 600 struct ipv6_addr *ap; 601 602 loginfox("%s: deleting address %s", ia->iface->name, ia->saddr); 603 if (if_address6(RTM_DELADDR, ia) == -1 && 604 errno != EADDRNOTAVAIL && errno != ESRCH && 605 errno != ENXIO && errno != ENODEV) 606 logerr(__func__); 607 608 ipv6_deletedaddr(ia); 609 610 state = IPV6_STATE(ia->iface); 611 TAILQ_FOREACH(ap, &state->addrs, next) { 612 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &ia->addr)) { 613 TAILQ_REMOVE(&state->addrs, ap, next); 614 ipv6_freeaddr(ap); 615 break; 616 } 617 } 618 619 #ifdef ND6_ADVERTISE 620 /* Advertise the address if it exists on another interface. */ 621 ipv6nd_advertise(ia); 622 #endif 623 } 624 625 static int 626 ipv6_addaddr1(struct ipv6_addr *ia, const struct timespec *now) 627 { 628 struct interface *ifp; 629 uint32_t pltime, vltime; 630 __printflike(1, 2) void (*logfunc)(const char *, ...); 631 #ifdef ND6_ADVERTISE 632 bool vltime_was_zero = ia->prefix_vltime == 0; 633 #endif 634 #ifdef __sun 635 struct ipv6_state *state; 636 struct ipv6_addr *ia2; 637 638 /* If we re-add then address on Solaris then the prefix 639 * route will be scrubbed and re-added. Something might 640 * be using it, so let's avoid it. */ 641 if (ia->flags & IPV6_AF_DADCOMPLETED) { 642 logdebugx("%s: IP address %s already exists", 643 ia->iface->name, ia->saddr); 644 #ifdef ND6_ADVERTISE 645 goto advertise; 646 #else 647 return 0; 648 #endif 649 } 650 #endif 651 652 /* Remember the interface of the address. */ 653 ifp = ia->iface; 654 655 if (!(ia->flags & IPV6_AF_DADCOMPLETED) && 656 ipv6_iffindaddr(ifp, &ia->addr, IN6_IFF_NOTUSEABLE)) 657 ia->flags |= IPV6_AF_DADCOMPLETED; 658 659 /* Adjust plftime and vltime based on acquired time */ 660 pltime = ia->prefix_pltime; 661 vltime = ia->prefix_vltime; 662 if (timespecisset(&ia->acquired) && 663 (ia->prefix_pltime != ND6_INFINITE_LIFETIME || 664 ia->prefix_vltime != ND6_INFINITE_LIFETIME)) 665 { 666 struct timespec n; 667 668 if (now == NULL) { 669 clock_gettime(CLOCK_MONOTONIC, &n); 670 now = &n; 671 } 672 timespecsub(now, &ia->acquired, &n); 673 if (ia->prefix_pltime != ND6_INFINITE_LIFETIME) { 674 ia->prefix_pltime -= (uint32_t)n.tv_sec; 675 /* This can happen when confirming a 676 * deprecated but still valid lease. */ 677 if (ia->prefix_pltime > pltime) 678 ia->prefix_pltime = 0; 679 } 680 if (ia->prefix_vltime != ND6_INFINITE_LIFETIME) { 681 ia->prefix_vltime -= (uint32_t)n.tv_sec; 682 /* This should never happen. */ 683 if (ia->prefix_vltime > vltime) { 684 logerrx("%s: %s: lifetime overflow", 685 ifp->name, ia->saddr); 686 ia->prefix_vltime = ia->prefix_pltime = 0; 687 } 688 } 689 } 690 691 logfunc = ia->flags & IPV6_AF_NEW ? loginfox : logdebugx; 692 logfunc("%s: adding %saddress %s", ifp->name, 693 #ifdef IPV6_AF_TEMPORARY 694 ia->flags & IPV6_AF_TEMPORARY ? "temporary " : "", 695 #else 696 "", 697 #endif 698 ia->saddr); 699 if (ia->prefix_pltime == ND6_INFINITE_LIFETIME && 700 ia->prefix_vltime == ND6_INFINITE_LIFETIME) 701 logdebugx("%s: pltime infinity, vltime infinity", 702 ifp->name); 703 else if (ia->prefix_pltime == ND6_INFINITE_LIFETIME) 704 logdebugx("%s: pltime infinity, vltime %"PRIu32" seconds", 705 ifp->name, ia->prefix_vltime); 706 else if (ia->prefix_vltime == ND6_INFINITE_LIFETIME) 707 logdebugx("%s: pltime %"PRIu32"seconds, vltime infinity", 708 ifp->name, ia->prefix_pltime); 709 else 710 logdebugx("%s: pltime %"PRIu32" seconds, vltime %"PRIu32 711 " seconds", 712 ifp->name, ia->prefix_pltime, ia->prefix_vltime); 713 714 if (if_address6(RTM_NEWADDR, ia) == -1) { 715 logerr(__func__); 716 /* Restore real pltime and vltime */ 717 ia->prefix_pltime = pltime; 718 ia->prefix_vltime = vltime; 719 return -1; 720 } 721 722 #ifdef IPV6_MANAGETEMPADDR 723 /* RFC4941 Section 3.4 */ 724 if (ia->flags & IPV6_AF_TEMPORARY && 725 ia->prefix_pltime && 726 ia->prefix_vltime && 727 ip6_use_tempaddr(ifp->name)) 728 eloop_timeout_add_sec(ifp->ctx->eloop, 729 (time_t)ia->prefix_pltime - REGEN_ADVANCE, 730 ipv6_regentempaddr, ia); 731 #endif 732 733 /* Restore real pltime and vltime */ 734 ia->prefix_pltime = pltime; 735 ia->prefix_vltime = vltime; 736 737 ia->flags &= ~IPV6_AF_NEW; 738 ia->flags |= IPV6_AF_ADDED; 739 #ifndef SMALL 740 if (ia->delegating_prefix != NULL) 741 ia->flags |= IPV6_AF_DELEGATED; 742 #endif 743 744 #ifdef IPV6_POLLADDRFLAG 745 eloop_timeout_delete(ifp->ctx->eloop, 746 ipv6_checkaddrflags, ia); 747 if (!(ia->flags & IPV6_AF_DADCOMPLETED)) { 748 struct timespec tv; 749 750 ms_to_ts(&tv, RETRANS_TIMER / 2); 751 eloop_timeout_add_tv(ifp->ctx->eloop, 752 &tv, ipv6_checkaddrflags, ia); 753 } 754 #endif 755 756 #ifdef __sun 757 /* Solaris does not announce new addresses which need DaD 758 * so we need to take a copy and add it to our list. 759 * Otherwise aliasing gets confused if we add another 760 * address during DaD. */ 761 762 state = IPV6_STATE(ifp); 763 TAILQ_FOREACH(ia2, &state->addrs, next) { 764 if (IN6_ARE_ADDR_EQUAL(&ia2->addr, &ia->addr)) 765 break; 766 } 767 if (ia2 == NULL) { 768 if ((ia2 = malloc(sizeof(*ia2))) == NULL) { 769 logerr(__func__); 770 return 0; /* Well, we did add the address */ 771 } 772 memcpy(ia2, ia, sizeof(*ia2)); 773 TAILQ_INSERT_TAIL(&state->addrs, ia2, next); 774 } 775 #endif 776 777 #ifdef ND6_ADVERTISE 778 #ifdef __sun 779 advertise: 780 #endif 781 /* Re-advertise the preferred address to be safe. */ 782 if (!vltime_was_zero) 783 ipv6nd_advertise(ia); 784 #endif 785 786 return 0; 787 } 788 789 #ifdef ALIAS_ADDR 790 /* Find the next logical alias address we can use. */ 791 static int 792 ipv6_aliasaddr(struct ipv6_addr *ia, struct ipv6_addr **repl) 793 { 794 struct ipv6_state *state; 795 struct ipv6_addr *iap; 796 unsigned int lun; 797 char alias[IF_NAMESIZE]; 798 799 if (ia->alias[0] != '\0') 800 return 0; 801 state = IPV6_STATE(ia->iface); 802 803 /* First find an existng address. 804 * This can happen when dhcpcd restarts as ND and DHCPv6 805 * maintain their own lists of addresses. */ 806 TAILQ_FOREACH(iap, &state->addrs, next) { 807 if (iap->alias[0] != '\0' && 808 IN6_ARE_ADDR_EQUAL(&iap->addr, &ia->addr)) 809 { 810 strlcpy(ia->alias, iap->alias, sizeof(ia->alias)); 811 return 0; 812 } 813 } 814 815 lun = 0; 816 find_unit: 817 if (if_makealias(alias, IF_NAMESIZE, ia->iface->name, lun) >= 818 IF_NAMESIZE) 819 { 820 errno = ENOMEM; 821 return -1; 822 } 823 TAILQ_FOREACH(iap, &state->addrs, next) { 824 if (iap->alias[0] == '\0') 825 continue; 826 if (IN6_IS_ADDR_UNSPECIFIED(&iap->addr)) { 827 /* No address assigned? Lets use it. */ 828 strlcpy(ia->alias, iap->alias, sizeof(ia->alias)); 829 if (repl) 830 *repl = iap; 831 return 1; 832 } 833 if (strcmp(iap->alias, alias) == 0) 834 break; 835 } 836 837 if (iap != NULL) { 838 if (lun == UINT_MAX) { 839 errno = ERANGE; 840 return -1; 841 } 842 lun++; 843 goto find_unit; 844 } 845 846 strlcpy(ia->alias, alias, sizeof(ia->alias)); 847 return 0; 848 } 849 #endif 850 851 int 852 ipv6_addaddr(struct ipv6_addr *ia, const struct timespec *now) 853 { 854 int r; 855 #ifdef ALIAS_ADDR 856 int replaced, blank; 857 struct ipv6_addr *replaced_ia; 858 859 blank = (ia->alias[0] == '\0'); 860 if ((replaced = ipv6_aliasaddr(ia, &replaced_ia)) == -1) 861 return -1; 862 if (blank) 863 logdebugx("%s: aliased %s", ia->alias, ia->saddr); 864 #endif 865 866 if ((r = ipv6_addaddr1(ia, now)) == 0) { 867 #ifdef ALIAS_ADDR 868 if (replaced) { 869 struct ipv6_state *state; 870 871 state = IPV6_STATE(ia->iface); 872 TAILQ_REMOVE(&state->addrs, replaced_ia, next); 873 ipv6_freeaddr(replaced_ia); 874 } 875 #endif 876 } 877 return r; 878 } 879 880 int 881 ipv6_findaddrmatch(const struct ipv6_addr *addr, const struct in6_addr *match, 882 unsigned int flags) 883 { 884 885 if (match == NULL) { 886 if ((addr->flags & 887 (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED)) == 888 (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED)) 889 return 1; 890 } else if (addr->prefix_vltime && 891 IN6_ARE_ADDR_EQUAL(&addr->addr, match) && 892 (!flags || addr->flags & flags)) 893 return 1; 894 895 return 0; 896 } 897 898 struct ipv6_addr * 899 ipv6_findaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr, unsigned int flags) 900 { 901 struct ipv6_addr *nap; 902 #ifdef DHCP6 903 struct ipv6_addr *dap; 904 #endif 905 906 nap = ipv6nd_findaddr(ctx, addr, flags); 907 #ifdef DHCP6 908 dap = dhcp6_findaddr(ctx, addr, flags); 909 if (!dap && !nap) 910 return NULL; 911 if (dap && !nap) 912 return dap; 913 if (nap && !dap) 914 return nap; 915 if (nap->iface->metric < dap->iface->metric) 916 return nap; 917 return dap; 918 #else 919 return nap; 920 #endif 921 } 922 923 ssize_t 924 ipv6_addaddrs(struct ipv6_addrhead *addrs) 925 { 926 struct ipv6_addr *ap, *apn; 927 ssize_t i; 928 struct timespec now; 929 930 i = 0; 931 timespecclear(&now); 932 TAILQ_FOREACH_SAFE(ap, addrs, next, apn) { 933 /* A delegated prefix is not an address. */ 934 if (ap->flags & IPV6_AF_DELEGATEDPFX) 935 continue; 936 if (ap->prefix_vltime == 0) { 937 if (ap->flags & IPV6_AF_ADDED) { 938 ipv6_deleteaddr(ap); 939 i++; 940 } 941 eloop_q_timeout_delete(ap->iface->ctx->eloop, 942 0, NULL, ap); 943 if (ap->flags & IPV6_AF_REQUEST) { 944 ap->flags &= ~IPV6_AF_ADDED; 945 } else { 946 TAILQ_REMOVE(addrs, ap, next); 947 ipv6_freeaddr(ap); 948 } 949 } else if (!(ap->flags & IPV6_AF_STALE) && 950 !IN6_IS_ADDR_UNSPECIFIED(&ap->addr)) 951 { 952 if (ap->flags & IPV6_AF_NEW) 953 i++; 954 if (!timespecisset(&now)) 955 clock_gettime(CLOCK_MONOTONIC, &now); 956 ipv6_addaddr(ap, &now); 957 } 958 } 959 960 return i; 961 } 962 963 void 964 ipv6_freeaddr(struct ipv6_addr *ia) 965 { 966 #ifndef SMALL 967 struct ipv6_addr *iad; 968 969 /* Forget the reference */ 970 if (ia->flags & IPV6_AF_DELEGATEDPFX) { 971 TAILQ_FOREACH(iad, &ia->pd_pfxs, pd_next) { 972 iad->delegating_prefix = NULL; 973 } 974 } else if (ia->delegating_prefix != NULL) { 975 TAILQ_REMOVE(&ia->delegating_prefix->pd_pfxs, ia, pd_next); 976 } 977 #endif 978 979 if (ia->dhcp6_fd != -1) { 980 close(ia->dhcp6_fd); 981 eloop_event_delete(ia->iface->ctx->eloop, ia->dhcp6_fd); 982 } 983 984 eloop_q_timeout_delete(ia->iface->ctx->eloop, 0, NULL, ia); 985 free(ia->na); 986 free(ia); 987 } 988 989 void 990 ipv6_freedrop_addrs(struct ipv6_addrhead *addrs, int drop, 991 const struct interface *ifd) 992 { 993 struct ipv6_addr *ap, *apn, *apf; 994 struct timespec now; 995 996 #ifdef SMALL 997 UNUSED(ifd); 998 #endif 999 timespecclear(&now); 1000 TAILQ_FOREACH_SAFE(ap, addrs, next, apn) { 1001 #ifndef SMALL 1002 if (ifd != NULL && 1003 (ap->delegating_prefix == NULL || 1004 ap->delegating_prefix->iface != ifd)) 1005 continue; 1006 #endif 1007 if (drop != 2) 1008 TAILQ_REMOVE(addrs, ap, next); 1009 if (drop && ap->flags & IPV6_AF_ADDED && 1010 (ap->iface->options->options & 1011 (DHCPCD_EXITING | DHCPCD_PERSISTENT)) != 1012 (DHCPCD_EXITING | DHCPCD_PERSISTENT)) 1013 { 1014 /* Don't drop link-local addresses. */ 1015 if (!IN6_IS_ADDR_LINKLOCAL(&ap->addr) || 1016 CAN_DROP_LLADDR(ap->iface)) 1017 { 1018 if (drop == 2) 1019 TAILQ_REMOVE(addrs, ap, next); 1020 /* Find the same address somewhere else */ 1021 apf = ipv6_findaddr(ap->iface->ctx, &ap->addr, 1022 0); 1023 if ((apf == NULL || 1024 (apf->iface != ap->iface))) 1025 ipv6_deleteaddr(ap); 1026 if (!(ap->iface->options->options & 1027 DHCPCD_EXITING) && apf) 1028 { 1029 if (!timespecisset(&now)) 1030 clock_gettime(CLOCK_MONOTONIC, 1031 &now); 1032 ipv6_addaddr(apf, &now); 1033 } 1034 if (drop == 2) 1035 ipv6_freeaddr(ap); 1036 } 1037 } 1038 if (drop != 2) 1039 ipv6_freeaddr(ap); 1040 } 1041 } 1042 1043 static struct ipv6_state * 1044 ipv6_getstate(struct interface *ifp) 1045 { 1046 struct ipv6_state *state; 1047 1048 state = IPV6_STATE(ifp); 1049 if (state == NULL) { 1050 ifp->if_data[IF_DATA_IPV6] = calloc(1, sizeof(*state)); 1051 state = IPV6_STATE(ifp); 1052 if (state == NULL) { 1053 logerr(__func__); 1054 return NULL; 1055 } 1056 TAILQ_INIT(&state->addrs); 1057 TAILQ_INIT(&state->ll_callbacks); 1058 1059 /* Regenerate new ids */ 1060 if (ifp->options && 1061 ip6_use_tempaddr(ifp->name)) 1062 ipv6_regentempifid(ifp); 1063 } 1064 return state; 1065 } 1066 1067 struct ipv6_addr * 1068 ipv6_anyglobal(struct interface *sifp) 1069 { 1070 struct interface *ifp; 1071 struct ipv6_state *state; 1072 struct ipv6_addr *ia; 1073 1074 TAILQ_FOREACH(ifp, sifp->ctx->ifaces, next) { 1075 if (ifp != sifp && ip6_forwarding(ifp->name) != 1) 1076 continue; 1077 1078 state = IPV6_STATE(ifp); 1079 if (state == NULL) 1080 continue; 1081 1082 TAILQ_FOREACH(ia, &state->addrs, next) { 1083 if (IN6_IS_ADDR_LINKLOCAL(&ia->addr)) 1084 continue; 1085 /* Let's be optimistic. 1086 * Any decent OS won't forward or accept traffic 1087 * from/to tentative or detached addresses. */ 1088 if (!(ia->addr_flags & IN6_IFF_DUPLICATED)) 1089 return ia; 1090 } 1091 } 1092 return NULL; 1093 } 1094 1095 void 1096 ipv6_handleifa(struct dhcpcd_ctx *ctx, 1097 int cmd, struct if_head *ifs, const char *ifname, 1098 const struct in6_addr *addr, uint8_t prefix_len, int addrflags, pid_t pid) 1099 { 1100 struct interface *ifp; 1101 struct ipv6_state *state; 1102 struct ipv6_addr *ia; 1103 struct ll_callback *cb; 1104 bool anyglobal; 1105 1106 #ifdef __sun 1107 struct sockaddr_in6 subnet; 1108 1109 /* Solaris on-link route is an unspecified address! */ 1110 if (IN6_IS_ADDR_UNSPECIFIED(addr)) { 1111 if (if_getsubnet(ctx, ifname, AF_INET6, 1112 &subnet, sizeof(subnet)) == -1) 1113 { 1114 logerr(__func__); 1115 return; 1116 } 1117 addr = &subnet.sin6_addr; 1118 } 1119 #endif 1120 1121 #if 0 1122 char dbuf[INET6_ADDRSTRLEN]; 1123 const char *dbp; 1124 1125 dbp = inet_ntop(AF_INET6, &addr->s6_addr, 1126 dbuf, INET6_ADDRSTRLEN); 1127 loginfox("%s: cmd %d addr %s addrflags %d", 1128 ifname, cmd, dbp, addrflags); 1129 #endif 1130 1131 if (ifs == NULL) 1132 ifs = ctx->ifaces; 1133 if (ifs == NULL) 1134 return; 1135 if ((ifp = if_find(ifs, ifname)) == NULL) 1136 return; 1137 if ((state = ipv6_getstate(ifp)) == NULL) 1138 return; 1139 anyglobal = ipv6_anyglobal(ifp) != NULL; 1140 1141 TAILQ_FOREACH(ia, &state->addrs, next) { 1142 if (IN6_ARE_ADDR_EQUAL(&ia->addr, addr)) 1143 break; 1144 } 1145 1146 switch (cmd) { 1147 case RTM_DELADDR: 1148 if (ia != NULL) { 1149 TAILQ_REMOVE(&state->addrs, ia, next); 1150 #ifdef ND6_ADVERTISE 1151 /* Advertise the address if it exists on 1152 * another interface. */ 1153 ipv6nd_advertise(ia); 1154 #endif 1155 /* We'll free it at the end of the function. */ 1156 } 1157 break; 1158 case RTM_NEWADDR: 1159 if (ia == NULL) { 1160 ia = ipv6_newaddr(ifp, addr, prefix_len, 0); 1161 #ifdef ALIAS_ADDR 1162 strlcpy(ia->alias, ifname, sizeof(ia->alias)); 1163 #endif 1164 if (if_getlifetime6(ia) == -1) { 1165 /* No support or address vanished. 1166 * Either way, just set a deprecated 1167 * infinite time lifetime and continue. 1168 * This is fine because we only want 1169 * to know this when trying to extend 1170 * temporary addresses. 1171 * As we can't extend infinite, we'll 1172 * create a new temporary address. */ 1173 ia->prefix_pltime = 0; 1174 ia->prefix_vltime = 1175 ND6_INFINITE_LIFETIME; 1176 } 1177 /* This is a minor regression against RFC 4941 1178 * because the kernel only knows when the 1179 * lifetimes were last updated, not when the 1180 * address was initially created. 1181 * Provided dhcpcd is not restarted, this 1182 * won't be a problem. 1183 * If we don't like it, we can always 1184 * pretend lifetimes are infinite and always 1185 * generate a new temporary address on 1186 * restart. */ 1187 ia->acquired = ia->created; 1188 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 1189 } 1190 ia->addr_flags = addrflags; 1191 ia->flags &= ~IPV6_AF_STALE; 1192 #ifdef IPV6_MANAGETEMPADDR 1193 if (ia->addr_flags & IN6_IFF_TEMPORARY) 1194 ia->flags |= IPV6_AF_TEMPORARY; 1195 #endif 1196 if (IN6_IS_ADDR_LINKLOCAL(&ia->addr) || ia->dadcallback) { 1197 #ifdef IPV6_POLLADDRFLAG 1198 if (ia->addr_flags & IN6_IFF_TENTATIVE) { 1199 struct timespec tv; 1200 1201 ms_to_ts(&tv, RETRANS_TIMER / 2); 1202 eloop_timeout_add_tv( 1203 ia->iface->ctx->eloop, 1204 &tv, ipv6_checkaddrflags, ia); 1205 break; 1206 } 1207 #endif 1208 1209 if (ia->dadcallback) { 1210 ia->dadcallback(ia); 1211 if (ctx->options & DHCPCD_FORKED) 1212 goto out; 1213 } 1214 1215 if (IN6_IS_ADDR_LINKLOCAL(&ia->addr) && 1216 !(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1217 { 1218 /* Now run any callbacks. 1219 * Typically IPv6RS or DHCPv6 */ 1220 while ((cb = 1221 TAILQ_FIRST(&state->ll_callbacks))) 1222 { 1223 TAILQ_REMOVE( 1224 &state->ll_callbacks, 1225 cb, next); 1226 cb->callback(cb->arg); 1227 free(cb); 1228 if (ctx->options & DHCPCD_FORKED) 1229 goto out; 1230 } 1231 } 1232 } 1233 break; 1234 } 1235 1236 if (ia == NULL) 1237 return; 1238 1239 ctx->options &= ~DHCPCD_RTBUILD; 1240 ipv6nd_handleifa(cmd, ia, pid); 1241 #ifdef DHCP6 1242 dhcp6_handleifa(cmd, ia, pid); 1243 #endif 1244 1245 out: 1246 /* Done with the ia now, so free it. */ 1247 if (cmd == RTM_DELADDR) 1248 ipv6_freeaddr(ia); 1249 else if (!(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1250 ia->flags |= IPV6_AF_DADCOMPLETED; 1251 1252 /* If we've not already called rt_build via the IPv6ND 1253 * or DHCP6 handlers and the existance of any useable 1254 * global address on the interface has changed, 1255 * call rt_build to add/remove the default route. */ 1256 if (ifp->active && 1257 ((ifp->options != NULL && ifp->options->options & DHCPCD_IPV6) || 1258 (ifp->options == NULL && ctx->options & DHCPCD_IPV6)) && 1259 !(ctx->options & DHCPCD_RTBUILD) && 1260 (ipv6_anyglobal(ifp) != NULL) != anyglobal) 1261 rt_build(ctx, AF_INET6); 1262 } 1263 1264 int 1265 ipv6_hasaddr(const struct interface *ifp) 1266 { 1267 1268 if (ipv6nd_iffindaddr(ifp, NULL, 0) != NULL) 1269 return 1; 1270 #ifdef DHCP6 1271 if (dhcp6_iffindaddr(ifp, NULL, 0) != NULL) 1272 return 1; 1273 #endif 1274 return 0; 1275 } 1276 1277 struct ipv6_addr * 1278 ipv6_iffindaddr(struct interface *ifp, const struct in6_addr *addr, 1279 int revflags) 1280 { 1281 struct ipv6_state *state; 1282 struct ipv6_addr *ap; 1283 1284 state = IPV6_STATE(ifp); 1285 if (state) { 1286 TAILQ_FOREACH(ap, &state->addrs, next) { 1287 if (addr == NULL) { 1288 if (IN6_IS_ADDR_LINKLOCAL(&ap->addr) && 1289 (!revflags || !(ap->addr_flags & revflags))) 1290 return ap; 1291 } else { 1292 if (IN6_ARE_ADDR_EQUAL(&ap->addr, addr) && 1293 (!revflags || !(ap->addr_flags & revflags))) 1294 return ap; 1295 } 1296 } 1297 } 1298 return NULL; 1299 } 1300 1301 static struct ipv6_addr * 1302 ipv6_iffindmaskaddr(const struct interface *ifp, const struct in6_addr *addr) 1303 { 1304 struct ipv6_state *state; 1305 struct ipv6_addr *ap; 1306 struct in6_addr mask; 1307 1308 state = IPV6_STATE(ifp); 1309 if (state) { 1310 TAILQ_FOREACH(ap, &state->addrs, next) { 1311 if (ipv6_mask(&mask, ap->prefix_len) == -1) 1312 continue; 1313 if (IN6_ARE_MASKED_ADDR_EQUAL(&ap->addr, addr, &mask)) 1314 return ap; 1315 } 1316 } 1317 return NULL; 1318 } 1319 1320 struct ipv6_addr * 1321 ipv6_findmaskaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr) 1322 { 1323 struct interface *ifp; 1324 struct ipv6_addr *ap; 1325 1326 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1327 ap = ipv6_iffindmaskaddr(ifp, addr); 1328 if (ap != NULL) 1329 return ap; 1330 } 1331 return NULL; 1332 } 1333 1334 int 1335 ipv6_addlinklocalcallback(struct interface *ifp, 1336 void (*callback)(void *), void *arg) 1337 { 1338 struct ipv6_state *state; 1339 struct ll_callback *cb; 1340 1341 state = ipv6_getstate(ifp); 1342 TAILQ_FOREACH(cb, &state->ll_callbacks, next) { 1343 if (cb->callback == callback && cb->arg == arg) 1344 break; 1345 } 1346 if (cb == NULL) { 1347 cb = malloc(sizeof(*cb)); 1348 if (cb == NULL) { 1349 logerr(__func__); 1350 return -1; 1351 } 1352 cb->callback = callback; 1353 cb->arg = arg; 1354 TAILQ_INSERT_TAIL(&state->ll_callbacks, cb, next); 1355 } 1356 return 0; 1357 } 1358 1359 static struct ipv6_addr * 1360 ipv6_newlinklocal(struct interface *ifp) 1361 { 1362 struct ipv6_addr *ia; 1363 struct in6_addr in6; 1364 1365 memset(&in6, 0, sizeof(in6)); 1366 in6.s6_addr32[0] = htonl(0xfe800000); 1367 ia = ipv6_newaddr(ifp, &in6, 64, 0); 1368 if (ia != NULL) { 1369 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1370 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1371 } 1372 return ia; 1373 } 1374 1375 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 1376 static const uint8_t allone[8] = 1377 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1378 1379 static int 1380 ipv6_addlinklocal(struct interface *ifp) 1381 { 1382 struct ipv6_state *state; 1383 struct ipv6_addr *ap, *ap2; 1384 int dadcounter; 1385 1386 /* Check sanity before malloc */ 1387 if (!(ifp->options->options & DHCPCD_SLAACPRIVATE)) { 1388 switch (ifp->family) { 1389 case ARPHRD_ETHER: 1390 /* Check for a valid hardware address */ 1391 if (ifp->hwlen != 6 && ifp->hwlen != 8) { 1392 errno = ENOTSUP; 1393 return -1; 1394 } 1395 if (memcmp(ifp->hwaddr, allzero, ifp->hwlen) == 0 || 1396 memcmp(ifp->hwaddr, allone, ifp->hwlen) == 0) 1397 { 1398 errno = EINVAL; 1399 return -1; 1400 } 1401 break; 1402 default: 1403 errno = ENOTSUP; 1404 return -1; 1405 } 1406 } 1407 1408 state = ipv6_getstate(ifp); 1409 if (state == NULL) 1410 return -1; 1411 1412 ap = ipv6_newlinklocal(ifp); 1413 if (ap == NULL) 1414 return -1; 1415 1416 dadcounter = 0; 1417 if (ifp->options->options & DHCPCD_SLAACPRIVATE) { 1418 nextslaacprivate: 1419 if (ipv6_makestableprivate(&ap->addr, 1420 &ap->prefix, ap->prefix_len, ifp, &dadcounter) == -1) 1421 { 1422 free(ap); 1423 return -1; 1424 } 1425 ap->dadcounter = dadcounter; 1426 } else { 1427 memcpy(ap->addr.s6_addr, ap->prefix.s6_addr, 8); 1428 switch (ifp->family) { 1429 case ARPHRD_ETHER: 1430 if (ifp->hwlen == 6) { 1431 ap->addr.s6_addr[ 8] = ifp->hwaddr[0]; 1432 ap->addr.s6_addr[ 9] = ifp->hwaddr[1]; 1433 ap->addr.s6_addr[10] = ifp->hwaddr[2]; 1434 ap->addr.s6_addr[11] = 0xff; 1435 ap->addr.s6_addr[12] = 0xfe; 1436 ap->addr.s6_addr[13] = ifp->hwaddr[3]; 1437 ap->addr.s6_addr[14] = ifp->hwaddr[4]; 1438 ap->addr.s6_addr[15] = ifp->hwaddr[5]; 1439 } else if (ifp->hwlen == 8) 1440 memcpy(&ap->addr.s6_addr[8], ifp->hwaddr, 8); 1441 else { 1442 free(ap); 1443 errno = ENOTSUP; 1444 return -1; 1445 } 1446 break; 1447 } 1448 1449 /* Sanity check: g bit must not indciate "group" */ 1450 if (EUI64_GROUP(&ap->addr)) { 1451 free(ap); 1452 errno = EINVAL; 1453 return -1; 1454 } 1455 EUI64_TO_IFID(&ap->addr); 1456 } 1457 1458 /* Do we already have this address? */ 1459 TAILQ_FOREACH(ap2, &state->addrs, next) { 1460 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &ap2->addr)) { 1461 if (ap2->addr_flags & IN6_IFF_DUPLICATED) { 1462 if (ifp->options->options & 1463 DHCPCD_SLAACPRIVATE) 1464 { 1465 dadcounter++; 1466 goto nextslaacprivate; 1467 } 1468 free(ap); 1469 errno = EADDRNOTAVAIL; 1470 return -1; 1471 } 1472 1473 logwarnx("%s: waiting for %s to complete", 1474 ap2->iface->name, ap2->saddr); 1475 free(ap); 1476 errno = EEXIST; 1477 return 0; 1478 } 1479 } 1480 1481 inet_ntop(AF_INET6, &ap->addr, ap->saddr, sizeof(ap->saddr)); 1482 TAILQ_INSERT_TAIL(&state->addrs, ap, next); 1483 ipv6_addaddr(ap, NULL); 1484 return 1; 1485 } 1486 1487 static int 1488 ipv6_tryaddlinklocal(struct interface *ifp) 1489 { 1490 struct ipv6_addr *ia; 1491 1492 /* We can't assign a link-locak address to this, 1493 * the ppp process has to. */ 1494 if (ifp->flags & IFF_POINTOPOINT) 1495 return 0; 1496 1497 ia = ipv6_iffindaddr(ifp, NULL, IN6_IFF_DUPLICATED); 1498 if (ia != NULL) { 1499 #ifdef IPV6_POLLADDRFLAG 1500 if (ia->addr_flags & IN6_IFF_TENTATIVE) { 1501 struct timespec tv; 1502 1503 ms_to_ts(&tv, RETRANS_TIMER / 2); 1504 eloop_timeout_add_tv( 1505 ia->iface->ctx->eloop, 1506 &tv, ipv6_checkaddrflags, ia); 1507 } 1508 #endif 1509 return 0; 1510 } 1511 if (!CAN_ADD_LLADDR(ifp)) 1512 return 0; 1513 1514 return ipv6_addlinklocal(ifp); 1515 } 1516 1517 struct ipv6_addr * 1518 ipv6_newaddr(struct interface *ifp, const struct in6_addr *addr, 1519 uint8_t prefix_len, unsigned int flags) 1520 { 1521 struct ipv6_addr *ia; 1522 char buf[INET6_ADDRSTRLEN]; 1523 const char *cbp; 1524 bool tempaddr; 1525 int addr_flags; 1526 1527 /* If adding a new DHCP / RA derived address, check current flags 1528 * from an existing address. */ 1529 ia = ipv6_iffindaddr(ifp, addr, 0); 1530 if (ia != NULL) 1531 addr_flags = ia->addr_flags; 1532 else 1533 addr_flags = IN6_IFF_TENTATIVE; 1534 1535 ia = calloc(1, sizeof(*ia)); 1536 if (ia == NULL) 1537 goto err; 1538 1539 ia->iface = ifp; 1540 ia->addr_flags = addr_flags; 1541 ia->flags = IPV6_AF_NEW | flags; 1542 if (!(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1543 ia->flags |= IPV6_AF_DADCOMPLETED; 1544 ia->prefix_len = prefix_len; 1545 ia->dhcp6_fd = -1; 1546 1547 #ifdef IPV6_AF_TEMPORARY 1548 tempaddr = ia->flags & IPV6_AF_TEMPORARY; 1549 #else 1550 tempaddr = false; 1551 #endif 1552 1553 if (ia->flags & IPV6_AF_AUTOCONF && !tempaddr) { 1554 ia->prefix = *addr; 1555 ia->dadcounter = ipv6_makeaddr(&ia->addr, ifp, 1556 &ia->prefix, 1557 ia->prefix_len); 1558 if (ia->dadcounter == -1) 1559 goto err; 1560 } else if (ia->flags & IPV6_AF_RAPFX) { 1561 ia->prefix = *addr; 1562 #ifdef __sun 1563 ia->addr = *addr; 1564 cbp = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); 1565 goto paddr; 1566 #else 1567 return ia; 1568 #endif 1569 } else if (ia->flags & (IPV6_AF_REQUEST | IPV6_AF_DELEGATEDPFX) && 1570 prefix_len != 128) 1571 { 1572 ia->prefix = *addr; 1573 cbp = inet_ntop(AF_INET6, &ia->prefix, buf, sizeof(buf)); 1574 goto paddr; 1575 } else { 1576 ia->addr = *addr; 1577 if (ipv6_makeprefix(&ia->prefix, 1578 &ia->addr, ia->prefix_len) == -1) 1579 goto err; 1580 } 1581 1582 cbp = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); 1583 paddr: 1584 if (cbp == NULL) 1585 goto err; 1586 snprintf(ia->saddr, sizeof(ia->saddr), "%s/%d", cbp, ia->prefix_len); 1587 1588 return ia; 1589 1590 err: 1591 logerr(__func__); 1592 free(ia); 1593 return NULL; 1594 } 1595 1596 static void 1597 ipv6_staticdadcallback(void *arg) 1598 { 1599 struct ipv6_addr *ia = arg; 1600 int wascompleted; 1601 1602 wascompleted = (ia->flags & IPV6_AF_DADCOMPLETED); 1603 ia->flags |= IPV6_AF_DADCOMPLETED; 1604 if (ia->flags & IPV6_AF_DUPLICATED) 1605 logwarnx("%s: DAD detected %s", ia->iface->name, 1606 ia->saddr); 1607 else if (!wascompleted) { 1608 logdebugx("%s: IPv6 static DAD completed", 1609 ia->iface->name); 1610 } 1611 1612 #define FINISHED (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED) 1613 if (!wascompleted) { 1614 struct interface *ifp; 1615 struct ipv6_state *state; 1616 1617 ifp = ia->iface; 1618 state = IPV6_STATE(ifp); 1619 TAILQ_FOREACH(ia, &state->addrs, next) { 1620 if (ia->flags & IPV6_AF_STATIC && 1621 (ia->flags & FINISHED) != FINISHED) 1622 { 1623 wascompleted = 1; 1624 break; 1625 } 1626 } 1627 if (!wascompleted) 1628 script_runreason(ifp, "STATIC6"); 1629 } 1630 #undef FINISHED 1631 } 1632 1633 ssize_t 1634 ipv6_env(FILE *fp, const char *prefix, const struct interface *ifp) 1635 { 1636 struct ipv6_addr *ia; 1637 1638 ia = ipv6_iffindaddr(UNCONST(ifp), &ifp->options->req_addr6, 1639 IN6_IFF_NOTUSEABLE); 1640 if (ia == NULL) 1641 return 0; 1642 if (efprintf(fp, "%s_ip6_address=%s", prefix, ia->saddr) == -1) 1643 return -1; 1644 return 1; 1645 } 1646 1647 int 1648 ipv6_staticdadcompleted(const struct interface *ifp) 1649 { 1650 const struct ipv6_state *state; 1651 const struct ipv6_addr *ia; 1652 int n; 1653 1654 if ((state = IPV6_CSTATE(ifp)) == NULL) 1655 return 0; 1656 n = 0; 1657 #define COMPLETED (IPV6_AF_STATIC | IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED) 1658 TAILQ_FOREACH(ia, &state->addrs, next) { 1659 if ((ia->flags & COMPLETED) == COMPLETED && 1660 !(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1661 n++; 1662 } 1663 return n; 1664 } 1665 1666 int 1667 ipv6_startstatic(struct interface *ifp) 1668 { 1669 struct ipv6_addr *ia; 1670 int run_script; 1671 1672 if (IN6_IS_ADDR_UNSPECIFIED(&ifp->options->req_addr6)) 1673 return 0; 1674 1675 ia = ipv6_iffindaddr(ifp, &ifp->options->req_addr6, 0); 1676 if (ia != NULL && 1677 (ia->prefix_len != ifp->options->req_prefix_len || 1678 ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1679 { 1680 ipv6_deleteaddr(ia); 1681 ia = NULL; 1682 } 1683 if (ia == NULL) { 1684 struct ipv6_state *state; 1685 1686 ia = ipv6_newaddr(ifp, &ifp->options->req_addr6, 1687 ifp->options->req_prefix_len, 0); 1688 if (ia == NULL) 1689 return -1; 1690 state = IPV6_STATE(ifp); 1691 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 1692 run_script = 0; 1693 } else 1694 run_script = 1; 1695 ia->flags |= IPV6_AF_STATIC | IPV6_AF_ONLINK; 1696 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1697 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1698 ia->dadcallback = ipv6_staticdadcallback; 1699 ipv6_addaddr(ia, NULL); 1700 rt_build(ifp->ctx, AF_INET6); 1701 if (run_script) 1702 script_runreason(ifp, "STATIC6"); 1703 return 1; 1704 } 1705 1706 /* Ensure the interface has a link-local address */ 1707 int 1708 ipv6_start(struct interface *ifp) 1709 { 1710 #ifdef IPV6_POLLADDRFLAG 1711 struct ipv6_state *state; 1712 1713 /* We need to update the address flags. */ 1714 if ((state = IPV6_STATE(ifp)) != NULL) { 1715 struct ipv6_addr *ia; 1716 const char *alias; 1717 int flags; 1718 1719 TAILQ_FOREACH(ia, &state->addrs, next) { 1720 #ifdef ALIAS_ADDR 1721 alias = ia->alias; 1722 #else 1723 alias = NULL; 1724 #endif 1725 flags = if_addrflags6(ia->iface, &ia->addr, alias); 1726 if (flags != -1) 1727 ia->addr_flags = flags; 1728 } 1729 } 1730 #endif 1731 1732 if (ipv6_tryaddlinklocal(ifp) == -1) 1733 return -1; 1734 1735 if (IPV6_CSTATE(ifp)) { 1736 /* Regenerate new ids */ 1737 if (ip6_use_tempaddr(ifp->name)) 1738 ipv6_regentempifid(ifp); 1739 } 1740 1741 return 0; 1742 } 1743 1744 void 1745 ipv6_freedrop(struct interface *ifp, int drop) 1746 { 1747 struct ipv6_state *state; 1748 struct ll_callback *cb; 1749 1750 if (ifp == NULL) 1751 return; 1752 1753 if ((state = IPV6_STATE(ifp)) == NULL) 1754 return; 1755 1756 /* If we got here, we can get rid of any LL callbacks. */ 1757 while ((cb = TAILQ_FIRST(&state->ll_callbacks))) { 1758 TAILQ_REMOVE(&state->ll_callbacks, cb, next); 1759 free(cb); 1760 } 1761 1762 ipv6_freedrop_addrs(&state->addrs, drop ? 2 : 0, NULL); 1763 if (drop) { 1764 if (ifp->ctx->ra_routers != NULL) 1765 rt_build(ifp->ctx, AF_INET6); 1766 } else { 1767 /* Because we need to cache the addresses we don't control, 1768 * we only free the state on when NOT dropping addresses. */ 1769 free(state); 1770 ifp->if_data[IF_DATA_IPV6] = NULL; 1771 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 1772 } 1773 } 1774 1775 void 1776 ipv6_ctxfree(struct dhcpcd_ctx *ctx) 1777 { 1778 1779 free(ctx->ra_routers); 1780 free(ctx->secret); 1781 } 1782 1783 int 1784 ipv6_handleifa_addrs(int cmd, 1785 struct ipv6_addrhead *addrs, const struct ipv6_addr *addr, pid_t pid) 1786 { 1787 struct ipv6_addr *ia, *ian; 1788 uint8_t found, alldadcompleted; 1789 1790 alldadcompleted = 1; 1791 found = 0; 1792 TAILQ_FOREACH_SAFE(ia, addrs, next, ian) { 1793 if (!IN6_ARE_ADDR_EQUAL(&addr->addr, &ia->addr)) { 1794 if (ia->flags & IPV6_AF_ADDED && 1795 !(ia->flags & IPV6_AF_DADCOMPLETED)) 1796 alldadcompleted = 0; 1797 continue; 1798 } 1799 switch (cmd) { 1800 case RTM_DELADDR: 1801 if (ia->flags & IPV6_AF_ADDED) { 1802 logwarnx("%s: pid %d deleted address %s", 1803 ia->iface->name, pid, ia->saddr); 1804 ia->flags &= ~IPV6_AF_ADDED; 1805 } 1806 if (ia->flags & IPV6_AF_DELEGATED) { 1807 TAILQ_REMOVE(addrs, ia, next); 1808 ipv6_deletedaddr(ia); 1809 ipv6_freeaddr(ia); 1810 } 1811 break; 1812 case RTM_NEWADDR: 1813 /* Safety - ignore tentative announcements */ 1814 if (addr->addr_flags & 1815 (IN6_IFF_DETACHED | IN6_IFF_TENTATIVE)) 1816 break; 1817 if ((ia->flags & IPV6_AF_DADCOMPLETED) == 0) { 1818 found++; 1819 if (addr->addr_flags & IN6_IFF_DUPLICATED) 1820 ia->flags |= IPV6_AF_DUPLICATED; 1821 else 1822 ia->flags &= ~IPV6_AF_DUPLICATED; 1823 if (ia->dadcallback) 1824 ia->dadcallback(ia); 1825 /* We need to set this here in-case the 1826 * dadcallback function checks it */ 1827 ia->flags |= IPV6_AF_DADCOMPLETED; 1828 } 1829 break; 1830 } 1831 } 1832 1833 return alldadcompleted ? found : 0; 1834 } 1835 1836 #ifdef IPV6_MANAGETEMPADDR 1837 static const struct ipv6_addr * 1838 ipv6_findaddrid(struct dhcpcd_ctx *ctx, uint8_t *addr) 1839 { 1840 const struct interface *ifp; 1841 const struct ipv6_state *state; 1842 const struct ipv6_addr *ia; 1843 1844 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1845 if ((state = IPV6_CSTATE(ifp))) { 1846 TAILQ_FOREACH(ia, &state->addrs, next) { 1847 if (memcmp(&ia->addr.s6_addr[8], addr, 8) == 0) 1848 return ia; 1849 } 1850 } 1851 } 1852 return NULL; 1853 } 1854 1855 static const uint8_t nullid[8]; 1856 static const uint8_t anycastid[8] = { 1857 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 }; 1858 static const uint8_t isatapid[4] = { 0x00, 0x00, 0x5e, 0xfe }; 1859 1860 static void 1861 ipv6_regen_desync(struct interface *ifp, int force) 1862 { 1863 struct ipv6_state *state; 1864 time_t max; 1865 1866 state = IPV6_STATE(ifp); 1867 1868 /* RFC4941 Section 5 states that DESYNC_FACTOR must never be 1869 * greater than TEMP_VALID_LIFETIME - REGEN_ADVANCE. 1870 * I believe this is an error and it should be never be greateter than 1871 * TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE. */ 1872 max = ip6_temp_preferred_lifetime(ifp->name) - REGEN_ADVANCE; 1873 if (state->desync_factor && !force && state->desync_factor < max) 1874 return; 1875 if (state->desync_factor == 0) 1876 state->desync_factor = 1877 (time_t)arc4random_uniform(MIN(MAX_DESYNC_FACTOR, 1878 (uint32_t)max)); 1879 max = ip6_temp_preferred_lifetime(ifp->name) - 1880 state->desync_factor - REGEN_ADVANCE; 1881 eloop_timeout_add_sec(ifp->ctx->eloop, max, ipv6_regentempifid, ifp); 1882 } 1883 1884 void 1885 ipv6_gentempifid(struct interface *ifp) 1886 { 1887 struct ipv6_state *state; 1888 MD5_CTX md5; 1889 uint8_t seed[16], digest[16]; 1890 int retry; 1891 1892 if ((state = IPV6_STATE(ifp)) == NULL) 1893 return; 1894 1895 retry = 0; 1896 if (memcmp(nullid, state->randomseed0, sizeof(nullid)) == 0) { 1897 uint32_t r; 1898 1899 r = arc4random(); 1900 memcpy(seed, &r, sizeof(r)); 1901 r = arc4random(); 1902 memcpy(seed + sizeof(r), &r, sizeof(r)); 1903 } else 1904 memcpy(seed, state->randomseed0, sizeof(state->randomseed0)); 1905 1906 memcpy(seed + sizeof(state->randomseed0), 1907 state->randomseed1, sizeof(state->randomseed1)); 1908 1909 again: 1910 MD5Init(&md5); 1911 MD5Update(&md5, seed, sizeof(seed)); 1912 MD5Final(digest, &md5); 1913 1914 /* RFC4941 Section 3.2.1.1 1915 * Take the left-most 64bits and set bit 6 to zero */ 1916 memcpy(state->randomid, digest, sizeof(state->randomid)); 1917 state->randomid[0] = (uint8_t)(state->randomid[0] & ~EUI64_UBIT); 1918 1919 /* RFC4941 Section 3.2.1.4 1920 * Reject reserved or existing id's */ 1921 if (memcmp(nullid, state->randomid, sizeof(nullid)) == 0 || 1922 (memcmp(anycastid, state->randomid, 7) == 0 && 1923 (anycastid[7] & state->randomid[7]) == anycastid[7]) || 1924 memcmp(isatapid, state->randomid, sizeof(isatapid)) == 0 || 1925 ipv6_findaddrid(ifp->ctx, state->randomid)) 1926 { 1927 if (++retry < GEN_TEMPID_RETRY_MAX) { 1928 memcpy(seed, digest + 8, 8); 1929 goto again; 1930 } 1931 memset(state->randomid, 0, sizeof(state->randomid)); 1932 } 1933 1934 /* RFC4941 Section 3.2.1.6 1935 * Save the right-most 64bits of the digest */ 1936 memcpy(state->randomseed0, digest + 8, 1937 sizeof(state->randomseed0)); 1938 } 1939 1940 /* RFC4941 Section 3.3.7 */ 1941 static void 1942 ipv6_tempdadcallback(void *arg) 1943 { 1944 struct ipv6_addr *ia = arg; 1945 1946 if (ia->flags & IPV6_AF_DUPLICATED) { 1947 struct ipv6_addr *ia1; 1948 struct timespec tv; 1949 1950 if (++ia->dadcounter == TEMP_IDGEN_RETRIES) { 1951 logerrx("%s: too many duplicate temporary addresses", 1952 ia->iface->name); 1953 return; 1954 } 1955 clock_gettime(CLOCK_MONOTONIC, &tv); 1956 if ((ia1 = ipv6_createtempaddr(ia, &tv)) == NULL) 1957 logerr(__func__); 1958 else 1959 ia1->dadcounter = ia->dadcounter; 1960 ipv6_deleteaddr(ia); 1961 if (ia1) 1962 ipv6_addaddr(ia1, &ia1->acquired); 1963 } 1964 } 1965 1966 struct ipv6_addr * 1967 ipv6_createtempaddr(struct ipv6_addr *ia0, const struct timespec *now) 1968 { 1969 struct ipv6_state *state; 1970 const struct ipv6_state *cstate; 1971 int genid; 1972 struct in6_addr addr, mask; 1973 uint32_t randid[2]; 1974 const struct interface *ifp; 1975 const struct ipv6_addr *ap; 1976 struct ipv6_addr *ia; 1977 uint32_t i, trylimit; 1978 1979 trylimit = TEMP_IDGEN_RETRIES; 1980 state = IPV6_STATE(ia0->iface); 1981 genid = 0; 1982 1983 addr = ia0->addr; 1984 ipv6_mask(&mask, ia0->prefix_len); 1985 /* clear the old ifid */ 1986 for (i = 0; i < 4; i++) 1987 addr.s6_addr32[i] &= mask.s6_addr32[i]; 1988 1989 again: 1990 if (memcmp(state->randomid, nullid, sizeof(nullid)) == 0) 1991 genid = 1; 1992 if (genid) { 1993 memcpy(state->randomseed1, &ia0->addr.s6_addr[8], 1994 sizeof(state->randomseed1)); 1995 ipv6_gentempifid(ia0->iface); 1996 if (memcmp(state->randomid, nullid, sizeof(nullid)) == 0) { 1997 errno = EFAULT; 1998 return NULL; 1999 } 2000 } 2001 memcpy(&randid[0], state->randomid, sizeof(randid[0])); 2002 memcpy(&randid[1], state->randomid + sizeof(randid[1]), 2003 sizeof(randid[2])); 2004 addr.s6_addr32[2] |= randid[0] & ~mask.s6_addr32[2]; 2005 addr.s6_addr32[3] |= randid[1] & ~mask.s6_addr32[3]; 2006 2007 /* Ensure we don't already have it */ 2008 TAILQ_FOREACH(ifp, ia0->iface->ctx->ifaces, next) { 2009 cstate = IPV6_CSTATE(ifp); 2010 if (cstate) { 2011 TAILQ_FOREACH(ap, &cstate->addrs, next) { 2012 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &addr)) { 2013 if (--trylimit == 0) { 2014 errno = EEXIST; 2015 return NULL; 2016 } 2017 genid = 1; 2018 goto again; 2019 } 2020 } 2021 } 2022 } 2023 2024 ia = ipv6_newaddr(ia0->iface, &addr, ia0->prefix_len, 2025 IPV6_AF_AUTOCONF | IPV6_AF_TEMPORARY); 2026 /* Must be made tentative, for our DaD to work */ 2027 ia->addr_flags = IN6_IFF_TENTATIVE; 2028 ia->dadcallback = ipv6_tempdadcallback; 2029 ia->created = ia->acquired = now ? *now : ia0->acquired; 2030 2031 /* Ensure desync is still valid */ 2032 ipv6_regen_desync(ia->iface, 0); 2033 2034 /* RFC4941 Section 3.3.4 */ 2035 i = (uint32_t)(ip6_temp_preferred_lifetime(ia0->iface->name) - 2036 state->desync_factor); 2037 ia->prefix_pltime = MIN(ia0->prefix_pltime, i); 2038 i = (uint32_t)ip6_temp_valid_lifetime(ia0->iface->name); 2039 ia->prefix_vltime = MIN(ia0->prefix_vltime, i); 2040 if (ia->prefix_pltime <= REGEN_ADVANCE || 2041 ia->prefix_pltime > ia0->prefix_vltime) 2042 { 2043 errno = EINVAL; 2044 free(ia); 2045 return NULL; 2046 } 2047 2048 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 2049 return ia; 2050 } 2051 2052 struct ipv6_addr * 2053 ipv6_settemptime(struct ipv6_addr *ia, int flags) 2054 { 2055 struct ipv6_state *state; 2056 struct ipv6_addr *ap, *first; 2057 2058 state = IPV6_STATE(ia->iface); 2059 first = NULL; 2060 TAILQ_FOREACH_REVERSE(ap, &state->addrs, ipv6_addrhead, next) { 2061 if (ap->flags & IPV6_AF_TEMPORARY && 2062 ap->prefix_pltime && 2063 IN6_ARE_ADDR_EQUAL(&ia->prefix, &ap->prefix)) 2064 { 2065 time_t max, ext; 2066 2067 if (flags == 0) { 2068 if (ap->prefix_pltime - 2069 (uint32_t)(ia->acquired.tv_sec - 2070 ap->acquired.tv_sec) 2071 < REGEN_ADVANCE) 2072 continue; 2073 2074 return ap; 2075 } 2076 2077 if (!(ap->flags & IPV6_AF_ADDED)) 2078 ap->flags |= IPV6_AF_NEW | IPV6_AF_AUTOCONF; 2079 ap->flags &= ~IPV6_AF_STALE; 2080 2081 /* RFC4941 Section 3.4 2082 * Deprecated prefix, deprecate the temporary address */ 2083 if (ia->prefix_pltime == 0) { 2084 ap->prefix_pltime = 0; 2085 goto valid; 2086 } 2087 2088 /* Ensure desync is still valid */ 2089 ipv6_regen_desync(ap->iface, 0); 2090 2091 /* RFC4941 Section 3.3.2 2092 * Extend temporary times, but ensure that they 2093 * never last beyond the system limit. */ 2094 ext = ia->acquired.tv_sec + (time_t)ia->prefix_pltime; 2095 max = ap->created.tv_sec + 2096 ip6_temp_preferred_lifetime(ap->iface->name) - 2097 state->desync_factor; 2098 if (ext < max) 2099 ap->prefix_pltime = ia->prefix_pltime; 2100 else 2101 ap->prefix_pltime = 2102 (uint32_t)(max - ia->acquired.tv_sec); 2103 2104 valid: 2105 ext = ia->acquired.tv_sec + (time_t)ia->prefix_vltime; 2106 max = ap->created.tv_sec + 2107 ip6_temp_valid_lifetime(ap->iface->name); 2108 if (ext < max) 2109 ap->prefix_vltime = ia->prefix_vltime; 2110 else 2111 ap->prefix_vltime = 2112 (uint32_t)(max - ia->acquired.tv_sec); 2113 2114 /* Just extend the latest matching prefix */ 2115 ap->acquired = ia->acquired; 2116 2117 /* If extending return the last match as 2118 * it's the most current. 2119 * If deprecating, deprecate any other addresses we 2120 * may have, although this should not be needed */ 2121 if (ia->prefix_pltime) 2122 return ap; 2123 if (first == NULL) 2124 first = ap; 2125 } 2126 } 2127 return first; 2128 } 2129 2130 void 2131 ipv6_addtempaddrs(struct interface *ifp, const struct timespec *now) 2132 { 2133 struct ipv6_state *state; 2134 struct ipv6_addr *ia; 2135 2136 state = IPV6_STATE(ifp); 2137 TAILQ_FOREACH(ia, &state->addrs, next) { 2138 if (ia->flags & IPV6_AF_TEMPORARY && 2139 !(ia->flags & IPV6_AF_STALE)) 2140 ipv6_addaddr(ia, now); 2141 } 2142 } 2143 2144 static void 2145 ipv6_regentempaddr(void *arg) 2146 { 2147 struct ipv6_addr *ia = arg, *ia1; 2148 struct timespec tv; 2149 2150 logdebugx("%s: regen temp addr %s", ia->iface->name, ia->saddr); 2151 clock_gettime(CLOCK_MONOTONIC, &tv); 2152 ia1 = ipv6_createtempaddr(ia, &tv); 2153 if (ia1) 2154 ipv6_addaddr(ia1, &tv); 2155 else 2156 logerr(__func__); 2157 } 2158 2159 static void 2160 ipv6_regentempifid(void *arg) 2161 { 2162 struct interface *ifp = arg; 2163 struct ipv6_state *state; 2164 2165 state = IPV6_STATE(ifp); 2166 if (memcmp(state->randomid, nullid, sizeof(state->randomid))) 2167 ipv6_gentempifid(ifp); 2168 2169 ipv6_regen_desync(ifp, 1); 2170 } 2171 #endif /* IPV6_MANAGETEMPADDR */ 2172 2173 void 2174 ipv6_markaddrsstale(struct interface *ifp, unsigned int flags) 2175 { 2176 struct ipv6_state *state; 2177 struct ipv6_addr *ia; 2178 2179 state = IPV6_STATE(ifp); 2180 if (state == NULL) 2181 return; 2182 2183 TAILQ_FOREACH(ia, &state->addrs, next) { 2184 if (flags == 0 || ia->flags & flags) 2185 ia->flags |= IPV6_AF_STALE; 2186 } 2187 } 2188 2189 void 2190 ipv6_deletestaleaddrs(struct interface *ifp) 2191 { 2192 struct ipv6_state *state; 2193 struct ipv6_addr *ia, *ia1; 2194 2195 state = IPV6_STATE(ifp); 2196 if (state == NULL) 2197 return; 2198 2199 TAILQ_FOREACH_SAFE(ia, &state->addrs, next, ia1) { 2200 if (ia->flags & IPV6_AF_STALE) 2201 ipv6_handleifa(ifp->ctx, RTM_DELADDR, 2202 ifp->ctx->ifaces, ifp->name, 2203 &ia->addr, ia->prefix_len, 0, getpid()); 2204 } 2205 } 2206 2207 2208 static struct rt * 2209 inet6_makeroute(struct interface *ifp, const struct ra *rap) 2210 { 2211 struct rt *rt; 2212 2213 if ((rt = rt_new(ifp)) == NULL) 2214 return NULL; 2215 2216 #ifdef HAVE_ROUTE_METRIC 2217 rt->rt_metric = ifp->metric; 2218 #endif 2219 if (rap != NULL) 2220 rt->rt_mtu = rap->mtu; 2221 return rt; 2222 } 2223 2224 static struct rt * 2225 inet6_makeprefix(struct interface *ifp, const struct ra *rap, 2226 const struct ipv6_addr *addr) 2227 { 2228 struct rt *rt; 2229 struct in6_addr netmask; 2230 2231 if (addr == NULL || addr->prefix_len > 128) { 2232 errno = EINVAL; 2233 return NULL; 2234 } 2235 2236 /* There is no point in trying to manage a /128 prefix, 2237 * ones without a lifetime. */ 2238 if (addr->prefix_len == 128 || addr->prefix_vltime == 0) 2239 return NULL; 2240 2241 /* Don't install a reject route when not creating bigger prefixes. */ 2242 if (addr->flags & IPV6_AF_NOREJECT) 2243 return NULL; 2244 2245 /* This address is the delegated prefix, so add a reject route for 2246 * it via the loopback interface. */ 2247 if (addr->flags & IPV6_AF_DELEGATEDPFX) { 2248 struct interface *lo0; 2249 2250 TAILQ_FOREACH(lo0, ifp->ctx->ifaces, next) { 2251 if (lo0->flags & IFF_LOOPBACK) 2252 break; 2253 } 2254 if (lo0 == NULL) 2255 logwarnx("cannot find a loopback interface " 2256 "to reject via"); 2257 else 2258 ifp = lo0; 2259 } 2260 2261 if ((rt = inet6_makeroute(ifp, rap)) == NULL) 2262 return NULL; 2263 2264 sa_in6_init(&rt->rt_dest, &addr->prefix); 2265 ipv6_mask(&netmask, addr->prefix_len); 2266 sa_in6_init(&rt->rt_netmask, &netmask); 2267 if (addr->flags & IPV6_AF_DELEGATEDPFX) { 2268 rt->rt_flags |= RTF_REJECT; 2269 /* Linux does not like a gateway for a reject route. */ 2270 #ifndef __linux__ 2271 sa_in6_init(&rt->rt_gateway, &in6addr_loopback); 2272 #endif 2273 } else if (!(addr->flags & IPV6_AF_ONLINK)) 2274 sa_in6_init(&rt->rt_gateway, &rap->from); 2275 else 2276 rt->rt_gateway.sa_family = AF_UNSPEC; 2277 sa_in6_init(&rt->rt_ifa, &addr->addr); 2278 return rt; 2279 } 2280 2281 static struct rt * 2282 inet6_makerouter(struct ra *rap) 2283 { 2284 struct rt *rt; 2285 2286 if ((rt = inet6_makeroute(rap->iface, rap)) == NULL) 2287 return NULL; 2288 sa_in6_init(&rt->rt_dest, &in6addr_any); 2289 sa_in6_init(&rt->rt_netmask, &in6addr_any); 2290 sa_in6_init(&rt->rt_gateway, &rap->from); 2291 return rt; 2292 } 2293 2294 #define RT_IS_DEFAULT(rtp) \ 2295 (IN6_ARE_ADDR_EQUAL(&((rtp)->dest), &in6addr_any) && \ 2296 IN6_ARE_ADDR_EQUAL(&((rtp)->mask), &in6addr_any)) 2297 2298 static int 2299 inet6_staticroutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx) 2300 { 2301 struct interface *ifp; 2302 struct ipv6_state *state; 2303 struct ipv6_addr *ia; 2304 struct rt *rt; 2305 2306 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2307 if ((state = IPV6_STATE(ifp)) == NULL) 2308 continue; 2309 TAILQ_FOREACH(ia, &state->addrs, next) { 2310 if ((ia->flags & (IPV6_AF_ADDED | IPV6_AF_STATIC)) == 2311 (IPV6_AF_ADDED | IPV6_AF_STATIC)) 2312 { 2313 rt = inet6_makeprefix(ifp, NULL, ia); 2314 if (rt) 2315 rt_proto_add(routes, rt); 2316 } 2317 } 2318 } 2319 return 0; 2320 } 2321 2322 static int 2323 inet6_raroutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx) 2324 { 2325 struct rt *rt; 2326 struct ra *rap; 2327 const struct ipv6_addr *addr; 2328 2329 TAILQ_FOREACH(rap, ctx->ra_routers, next) { 2330 if (rap->expired) 2331 continue; 2332 TAILQ_FOREACH(addr, &rap->addrs, next) { 2333 if (addr->prefix_vltime == 0) 2334 continue; 2335 rt = inet6_makeprefix(rap->iface, rap, addr); 2336 if (rt) { 2337 rt->rt_dflags |= RTDF_RA; 2338 rt_proto_add(routes, rt); 2339 } 2340 } 2341 if (rap->lifetime == 0) 2342 continue; 2343 if (ipv6_anyglobal(rap->iface) == NULL) 2344 continue; 2345 rt = inet6_makerouter(rap); 2346 if (rt == NULL) 2347 continue; 2348 rt->rt_dflags |= RTDF_RA; 2349 rt_proto_add(routes, rt); 2350 } 2351 return 0; 2352 } 2353 2354 #ifdef DHCP6 2355 static int 2356 inet6_dhcproutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx, 2357 enum DH6S dstate) 2358 { 2359 struct interface *ifp; 2360 const struct dhcp6_state *d6_state; 2361 const struct ipv6_addr *addr; 2362 struct rt *rt; 2363 2364 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2365 d6_state = D6_CSTATE(ifp); 2366 if (d6_state && d6_state->state == dstate) { 2367 TAILQ_FOREACH(addr, &d6_state->addrs, next) { 2368 rt = inet6_makeprefix(ifp, NULL, addr); 2369 if (rt == NULL) 2370 continue; 2371 rt->rt_dflags |= RTDF_DHCP; 2372 rt_proto_add(routes, rt); 2373 } 2374 } 2375 } 2376 return 0; 2377 } 2378 #endif 2379 2380 bool 2381 inet6_getroutes(struct dhcpcd_ctx *ctx, rb_tree_t *routes) 2382 { 2383 2384 /* Should static take priority? */ 2385 if (inet6_staticroutes(routes, ctx) == -1) 2386 return false; 2387 2388 /* First add reachable routers and their prefixes */ 2389 if (inet6_raroutes(routes, ctx) == -1) 2390 return false; 2391 2392 #ifdef DHCP6 2393 /* We have no way of knowing if prefixes added by DHCP are reachable 2394 * or not, so we have to assume they are. 2395 * Add bound before delegated so we can prefer interfaces better. */ 2396 if (inet6_dhcproutes(routes, ctx, DH6S_BOUND) == -1) 2397 return false; 2398 if (inet6_dhcproutes(routes, ctx, DH6S_DELEGATED) == -1) 2399 return false; 2400 #endif 2401 2402 return true; 2403 } 2404