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 && ifp->options->options & DHCPCD_IPV6 && 1257 !(ctx->options & DHCPCD_RTBUILD) && 1258 (ipv6_anyglobal(ifp) != NULL) != anyglobal) 1259 rt_build(ctx, AF_INET6); 1260 } 1261 1262 int 1263 ipv6_hasaddr(const struct interface *ifp) 1264 { 1265 1266 if (ipv6nd_iffindaddr(ifp, NULL, 0) != NULL) 1267 return 1; 1268 #ifdef DHCP6 1269 if (dhcp6_iffindaddr(ifp, NULL, 0) != NULL) 1270 return 1; 1271 #endif 1272 return 0; 1273 } 1274 1275 struct ipv6_addr * 1276 ipv6_iffindaddr(struct interface *ifp, const struct in6_addr *addr, 1277 int revflags) 1278 { 1279 struct ipv6_state *state; 1280 struct ipv6_addr *ap; 1281 1282 state = IPV6_STATE(ifp); 1283 if (state) { 1284 TAILQ_FOREACH(ap, &state->addrs, next) { 1285 if (addr == NULL) { 1286 if (IN6_IS_ADDR_LINKLOCAL(&ap->addr) && 1287 (!revflags || !(ap->addr_flags & revflags))) 1288 return ap; 1289 } else { 1290 if (IN6_ARE_ADDR_EQUAL(&ap->addr, addr) && 1291 (!revflags || !(ap->addr_flags & revflags))) 1292 return ap; 1293 } 1294 } 1295 } 1296 return NULL; 1297 } 1298 1299 static struct ipv6_addr * 1300 ipv6_iffindmaskaddr(const struct interface *ifp, const struct in6_addr *addr) 1301 { 1302 struct ipv6_state *state; 1303 struct ipv6_addr *ap; 1304 struct in6_addr mask; 1305 1306 state = IPV6_STATE(ifp); 1307 if (state) { 1308 TAILQ_FOREACH(ap, &state->addrs, next) { 1309 if (ipv6_mask(&mask, ap->prefix_len) == -1) 1310 continue; 1311 if (IN6_ARE_MASKED_ADDR_EQUAL(&ap->addr, addr, &mask)) 1312 return ap; 1313 } 1314 } 1315 return NULL; 1316 } 1317 1318 struct ipv6_addr * 1319 ipv6_findmaskaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr) 1320 { 1321 struct interface *ifp; 1322 struct ipv6_addr *ap; 1323 1324 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1325 ap = ipv6_iffindmaskaddr(ifp, addr); 1326 if (ap != NULL) 1327 return ap; 1328 } 1329 return NULL; 1330 } 1331 1332 int 1333 ipv6_addlinklocalcallback(struct interface *ifp, 1334 void (*callback)(void *), void *arg) 1335 { 1336 struct ipv6_state *state; 1337 struct ll_callback *cb; 1338 1339 state = ipv6_getstate(ifp); 1340 TAILQ_FOREACH(cb, &state->ll_callbacks, next) { 1341 if (cb->callback == callback && cb->arg == arg) 1342 break; 1343 } 1344 if (cb == NULL) { 1345 cb = malloc(sizeof(*cb)); 1346 if (cb == NULL) { 1347 logerr(__func__); 1348 return -1; 1349 } 1350 cb->callback = callback; 1351 cb->arg = arg; 1352 TAILQ_INSERT_TAIL(&state->ll_callbacks, cb, next); 1353 } 1354 return 0; 1355 } 1356 1357 static struct ipv6_addr * 1358 ipv6_newlinklocal(struct interface *ifp) 1359 { 1360 struct ipv6_addr *ia; 1361 struct in6_addr in6; 1362 1363 memset(&in6, 0, sizeof(in6)); 1364 in6.s6_addr32[0] = htonl(0xfe800000); 1365 ia = ipv6_newaddr(ifp, &in6, 64, 0); 1366 if (ia != NULL) { 1367 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1368 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1369 } 1370 return ia; 1371 } 1372 1373 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 1374 static const uint8_t allone[8] = 1375 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1376 1377 static int 1378 ipv6_addlinklocal(struct interface *ifp) 1379 { 1380 struct ipv6_state *state; 1381 struct ipv6_addr *ap, *ap2; 1382 int dadcounter; 1383 1384 /* Check sanity before malloc */ 1385 if (!(ifp->options->options & DHCPCD_SLAACPRIVATE)) { 1386 switch (ifp->family) { 1387 case ARPHRD_ETHER: 1388 /* Check for a valid hardware address */ 1389 if (ifp->hwlen != 6 && ifp->hwlen != 8) { 1390 errno = ENOTSUP; 1391 return -1; 1392 } 1393 if (memcmp(ifp->hwaddr, allzero, ifp->hwlen) == 0 || 1394 memcmp(ifp->hwaddr, allone, ifp->hwlen) == 0) 1395 { 1396 errno = EINVAL; 1397 return -1; 1398 } 1399 break; 1400 default: 1401 errno = ENOTSUP; 1402 return -1; 1403 } 1404 } 1405 1406 state = ipv6_getstate(ifp); 1407 if (state == NULL) 1408 return -1; 1409 1410 ap = ipv6_newlinklocal(ifp); 1411 if (ap == NULL) 1412 return -1; 1413 1414 dadcounter = 0; 1415 if (ifp->options->options & DHCPCD_SLAACPRIVATE) { 1416 nextslaacprivate: 1417 if (ipv6_makestableprivate(&ap->addr, 1418 &ap->prefix, ap->prefix_len, ifp, &dadcounter) == -1) 1419 { 1420 free(ap); 1421 return -1; 1422 } 1423 ap->dadcounter = dadcounter; 1424 } else { 1425 memcpy(ap->addr.s6_addr, ap->prefix.s6_addr, 8); 1426 switch (ifp->family) { 1427 case ARPHRD_ETHER: 1428 if (ifp->hwlen == 6) { 1429 ap->addr.s6_addr[ 8] = ifp->hwaddr[0]; 1430 ap->addr.s6_addr[ 9] = ifp->hwaddr[1]; 1431 ap->addr.s6_addr[10] = ifp->hwaddr[2]; 1432 ap->addr.s6_addr[11] = 0xff; 1433 ap->addr.s6_addr[12] = 0xfe; 1434 ap->addr.s6_addr[13] = ifp->hwaddr[3]; 1435 ap->addr.s6_addr[14] = ifp->hwaddr[4]; 1436 ap->addr.s6_addr[15] = ifp->hwaddr[5]; 1437 } else if (ifp->hwlen == 8) 1438 memcpy(&ap->addr.s6_addr[8], ifp->hwaddr, 8); 1439 else { 1440 free(ap); 1441 errno = ENOTSUP; 1442 return -1; 1443 } 1444 break; 1445 } 1446 1447 /* Sanity check: g bit must not indciate "group" */ 1448 if (EUI64_GROUP(&ap->addr)) { 1449 free(ap); 1450 errno = EINVAL; 1451 return -1; 1452 } 1453 EUI64_TO_IFID(&ap->addr); 1454 } 1455 1456 /* Do we already have this address? */ 1457 TAILQ_FOREACH(ap2, &state->addrs, next) { 1458 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &ap2->addr)) { 1459 if (ap2->addr_flags & IN6_IFF_DUPLICATED) { 1460 if (ifp->options->options & 1461 DHCPCD_SLAACPRIVATE) 1462 { 1463 dadcounter++; 1464 goto nextslaacprivate; 1465 } 1466 free(ap); 1467 errno = EADDRNOTAVAIL; 1468 return -1; 1469 } 1470 1471 logwarnx("%s: waiting for %s to complete", 1472 ap2->iface->name, ap2->saddr); 1473 free(ap); 1474 errno = EEXIST; 1475 return 0; 1476 } 1477 } 1478 1479 inet_ntop(AF_INET6, &ap->addr, ap->saddr, sizeof(ap->saddr)); 1480 TAILQ_INSERT_TAIL(&state->addrs, ap, next); 1481 ipv6_addaddr(ap, NULL); 1482 return 1; 1483 } 1484 1485 static int 1486 ipv6_tryaddlinklocal(struct interface *ifp) 1487 { 1488 struct ipv6_addr *ia; 1489 1490 /* We can't assign a link-locak address to this, 1491 * the ppp process has to. */ 1492 if (ifp->flags & IFF_POINTOPOINT) 1493 return 0; 1494 1495 ia = ipv6_iffindaddr(ifp, NULL, IN6_IFF_DUPLICATED); 1496 if (ia != NULL) { 1497 #ifdef IPV6_POLLADDRFLAG 1498 if (ia->addr_flags & IN6_IFF_TENTATIVE) { 1499 struct timespec tv; 1500 1501 ms_to_ts(&tv, RETRANS_TIMER / 2); 1502 eloop_timeout_add_tv( 1503 ia->iface->ctx->eloop, 1504 &tv, ipv6_checkaddrflags, ia); 1505 } 1506 #endif 1507 return 0; 1508 } 1509 if (!CAN_ADD_LLADDR(ifp)) 1510 return 0; 1511 1512 return ipv6_addlinklocal(ifp); 1513 } 1514 1515 struct ipv6_addr * 1516 ipv6_newaddr(struct interface *ifp, const struct in6_addr *addr, 1517 uint8_t prefix_len, unsigned int flags) 1518 { 1519 struct ipv6_addr *ia; 1520 char buf[INET6_ADDRSTRLEN]; 1521 const char *cbp; 1522 bool tempaddr; 1523 int addr_flags; 1524 1525 /* If adding a new DHCP / RA derived address, check current flags 1526 * from an existing address. */ 1527 ia = ipv6_iffindaddr(ifp, addr, 0); 1528 if (ia != NULL) 1529 addr_flags = ia->addr_flags; 1530 else 1531 addr_flags = IN6_IFF_TENTATIVE; 1532 1533 ia = calloc(1, sizeof(*ia)); 1534 if (ia == NULL) 1535 goto err; 1536 1537 ia->iface = ifp; 1538 ia->addr_flags = addr_flags; 1539 ia->flags = IPV6_AF_NEW | flags; 1540 if (!(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1541 ia->flags |= IPV6_AF_DADCOMPLETED; 1542 ia->prefix_len = prefix_len; 1543 ia->dhcp6_fd = -1; 1544 1545 #ifdef IPV6_AF_TEMPORARY 1546 tempaddr = ia->flags & IPV6_AF_TEMPORARY; 1547 #else 1548 tempaddr = false; 1549 #endif 1550 1551 if (ia->flags & IPV6_AF_AUTOCONF && !tempaddr) { 1552 ia->prefix = *addr; 1553 ia->dadcounter = ipv6_makeaddr(&ia->addr, ifp, 1554 &ia->prefix, 1555 ia->prefix_len); 1556 if (ia->dadcounter == -1) 1557 goto err; 1558 } else if (ia->flags & IPV6_AF_RAPFX) { 1559 ia->prefix = *addr; 1560 #ifdef __sun 1561 ia->addr = *addr; 1562 cbp = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); 1563 goto paddr; 1564 #else 1565 return ia; 1566 #endif 1567 } else if (ia->flags & (IPV6_AF_REQUEST | IPV6_AF_DELEGATEDPFX) && 1568 prefix_len != 128) 1569 { 1570 ia->prefix = *addr; 1571 cbp = inet_ntop(AF_INET6, &ia->prefix, buf, sizeof(buf)); 1572 goto paddr; 1573 } else { 1574 ia->addr = *addr; 1575 if (ipv6_makeprefix(&ia->prefix, 1576 &ia->addr, ia->prefix_len) == -1) 1577 goto err; 1578 } 1579 1580 cbp = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); 1581 paddr: 1582 if (cbp == NULL) 1583 goto err; 1584 snprintf(ia->saddr, sizeof(ia->saddr), "%s/%d", cbp, ia->prefix_len); 1585 1586 return ia; 1587 1588 err: 1589 logerr(__func__); 1590 free(ia); 1591 return NULL; 1592 } 1593 1594 static void 1595 ipv6_staticdadcallback(void *arg) 1596 { 1597 struct ipv6_addr *ia = arg; 1598 int wascompleted; 1599 1600 wascompleted = (ia->flags & IPV6_AF_DADCOMPLETED); 1601 ia->flags |= IPV6_AF_DADCOMPLETED; 1602 if (ia->flags & IPV6_AF_DUPLICATED) 1603 logwarnx("%s: DAD detected %s", ia->iface->name, 1604 ia->saddr); 1605 else if (!wascompleted) { 1606 logdebugx("%s: IPv6 static DAD completed", 1607 ia->iface->name); 1608 } 1609 1610 #define FINISHED (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED) 1611 if (!wascompleted) { 1612 struct interface *ifp; 1613 struct ipv6_state *state; 1614 1615 ifp = ia->iface; 1616 state = IPV6_STATE(ifp); 1617 TAILQ_FOREACH(ia, &state->addrs, next) { 1618 if (ia->flags & IPV6_AF_STATIC && 1619 (ia->flags & FINISHED) != FINISHED) 1620 { 1621 wascompleted = 1; 1622 break; 1623 } 1624 } 1625 if (!wascompleted) 1626 script_runreason(ifp, "STATIC6"); 1627 } 1628 #undef FINISHED 1629 } 1630 1631 ssize_t 1632 ipv6_env(FILE *fp, const char *prefix, const struct interface *ifp) 1633 { 1634 struct ipv6_addr *ia; 1635 1636 ia = ipv6_iffindaddr(UNCONST(ifp), &ifp->options->req_addr6, 1637 IN6_IFF_NOTUSEABLE); 1638 if (ia == NULL) 1639 return 0; 1640 if (efprintf(fp, "%s_ip6_address=%s", prefix, ia->saddr) == -1) 1641 return -1; 1642 return 1; 1643 } 1644 1645 int 1646 ipv6_staticdadcompleted(const struct interface *ifp) 1647 { 1648 const struct ipv6_state *state; 1649 const struct ipv6_addr *ia; 1650 int n; 1651 1652 if ((state = IPV6_CSTATE(ifp)) == NULL) 1653 return 0; 1654 n = 0; 1655 #define COMPLETED (IPV6_AF_STATIC | IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED) 1656 TAILQ_FOREACH(ia, &state->addrs, next) { 1657 if ((ia->flags & COMPLETED) == COMPLETED && 1658 !(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1659 n++; 1660 } 1661 return n; 1662 } 1663 1664 int 1665 ipv6_startstatic(struct interface *ifp) 1666 { 1667 struct ipv6_addr *ia; 1668 int run_script; 1669 1670 if (IN6_IS_ADDR_UNSPECIFIED(&ifp->options->req_addr6)) 1671 return 0; 1672 1673 ia = ipv6_iffindaddr(ifp, &ifp->options->req_addr6, 0); 1674 if (ia != NULL && 1675 (ia->prefix_len != ifp->options->req_prefix_len || 1676 ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1677 { 1678 ipv6_deleteaddr(ia); 1679 ia = NULL; 1680 } 1681 if (ia == NULL) { 1682 struct ipv6_state *state; 1683 1684 ia = ipv6_newaddr(ifp, &ifp->options->req_addr6, 1685 ifp->options->req_prefix_len, 0); 1686 if (ia == NULL) 1687 return -1; 1688 state = IPV6_STATE(ifp); 1689 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 1690 run_script = 0; 1691 } else 1692 run_script = 1; 1693 ia->flags |= IPV6_AF_STATIC | IPV6_AF_ONLINK; 1694 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1695 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1696 ia->dadcallback = ipv6_staticdadcallback; 1697 ipv6_addaddr(ia, NULL); 1698 rt_build(ifp->ctx, AF_INET6); 1699 if (run_script) 1700 script_runreason(ifp, "STATIC6"); 1701 return 1; 1702 } 1703 1704 /* Ensure the interface has a link-local address */ 1705 int 1706 ipv6_start(struct interface *ifp) 1707 { 1708 #ifdef IPV6_POLLADDRFLAG 1709 struct ipv6_state *state; 1710 1711 /* We need to update the address flags. */ 1712 if ((state = IPV6_STATE(ifp)) != NULL) { 1713 struct ipv6_addr *ia; 1714 const char *alias; 1715 int flags; 1716 1717 TAILQ_FOREACH(ia, &state->addrs, next) { 1718 #ifdef ALIAS_ADDR 1719 alias = ia->alias; 1720 #else 1721 alias = NULL; 1722 #endif 1723 flags = if_addrflags6(ia->iface, &ia->addr, alias); 1724 if (flags != -1) 1725 ia->addr_flags = flags; 1726 } 1727 } 1728 #endif 1729 1730 if (ipv6_tryaddlinklocal(ifp) == -1) 1731 return -1; 1732 1733 if (IPV6_CSTATE(ifp)) { 1734 /* Regenerate new ids */ 1735 if (ip6_use_tempaddr(ifp->name)) 1736 ipv6_regentempifid(ifp); 1737 } 1738 1739 return 0; 1740 } 1741 1742 void 1743 ipv6_freedrop(struct interface *ifp, int drop) 1744 { 1745 struct ipv6_state *state; 1746 struct ll_callback *cb; 1747 1748 if (ifp == NULL) 1749 return; 1750 1751 if ((state = IPV6_STATE(ifp)) == NULL) 1752 return; 1753 1754 /* If we got here, we can get rid of any LL callbacks. */ 1755 while ((cb = TAILQ_FIRST(&state->ll_callbacks))) { 1756 TAILQ_REMOVE(&state->ll_callbacks, cb, next); 1757 free(cb); 1758 } 1759 1760 ipv6_freedrop_addrs(&state->addrs, drop ? 2 : 0, NULL); 1761 if (drop) { 1762 if (ifp->ctx->ra_routers != NULL) 1763 rt_build(ifp->ctx, AF_INET6); 1764 } else { 1765 /* Because we need to cache the addresses we don't control, 1766 * we only free the state on when NOT dropping addresses. */ 1767 free(state); 1768 ifp->if_data[IF_DATA_IPV6] = NULL; 1769 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 1770 } 1771 } 1772 1773 void 1774 ipv6_ctxfree(struct dhcpcd_ctx *ctx) 1775 { 1776 1777 free(ctx->ra_routers); 1778 free(ctx->secret); 1779 } 1780 1781 int 1782 ipv6_handleifa_addrs(int cmd, 1783 struct ipv6_addrhead *addrs, const struct ipv6_addr *addr, pid_t pid) 1784 { 1785 struct ipv6_addr *ia, *ian; 1786 uint8_t found, alldadcompleted; 1787 1788 alldadcompleted = 1; 1789 found = 0; 1790 TAILQ_FOREACH_SAFE(ia, addrs, next, ian) { 1791 if (!IN6_ARE_ADDR_EQUAL(&addr->addr, &ia->addr)) { 1792 if (ia->flags & IPV6_AF_ADDED && 1793 !(ia->flags & IPV6_AF_DADCOMPLETED)) 1794 alldadcompleted = 0; 1795 continue; 1796 } 1797 switch (cmd) { 1798 case RTM_DELADDR: 1799 if (ia->flags & IPV6_AF_ADDED) { 1800 logwarnx("%s: pid %d deleted address %s", 1801 ia->iface->name, pid, ia->saddr); 1802 ia->flags &= ~IPV6_AF_ADDED; 1803 } 1804 if (ia->flags & IPV6_AF_DELEGATED) { 1805 TAILQ_REMOVE(addrs, ia, next); 1806 ipv6_deletedaddr(ia); 1807 ipv6_freeaddr(ia); 1808 } 1809 break; 1810 case RTM_NEWADDR: 1811 /* Safety - ignore tentative announcements */ 1812 if (addr->addr_flags & 1813 (IN6_IFF_DETACHED | IN6_IFF_TENTATIVE)) 1814 break; 1815 if ((ia->flags & IPV6_AF_DADCOMPLETED) == 0) { 1816 found++; 1817 if (addr->addr_flags & IN6_IFF_DUPLICATED) 1818 ia->flags |= IPV6_AF_DUPLICATED; 1819 else 1820 ia->flags &= ~IPV6_AF_DUPLICATED; 1821 if (ia->dadcallback) 1822 ia->dadcallback(ia); 1823 /* We need to set this here in-case the 1824 * dadcallback function checks it */ 1825 ia->flags |= IPV6_AF_DADCOMPLETED; 1826 } 1827 break; 1828 } 1829 } 1830 1831 return alldadcompleted ? found : 0; 1832 } 1833 1834 #ifdef IPV6_MANAGETEMPADDR 1835 static const struct ipv6_addr * 1836 ipv6_findaddrid(struct dhcpcd_ctx *ctx, uint8_t *addr) 1837 { 1838 const struct interface *ifp; 1839 const struct ipv6_state *state; 1840 const struct ipv6_addr *ia; 1841 1842 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1843 if ((state = IPV6_CSTATE(ifp))) { 1844 TAILQ_FOREACH(ia, &state->addrs, next) { 1845 if (memcmp(&ia->addr.s6_addr[8], addr, 8) == 0) 1846 return ia; 1847 } 1848 } 1849 } 1850 return NULL; 1851 } 1852 1853 static const uint8_t nullid[8]; 1854 static const uint8_t anycastid[8] = { 1855 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 }; 1856 static const uint8_t isatapid[4] = { 0x00, 0x00, 0x5e, 0xfe }; 1857 1858 static void 1859 ipv6_regen_desync(struct interface *ifp, int force) 1860 { 1861 struct ipv6_state *state; 1862 time_t max; 1863 1864 state = IPV6_STATE(ifp); 1865 1866 /* RFC4941 Section 5 states that DESYNC_FACTOR must never be 1867 * greater than TEMP_VALID_LIFETIME - REGEN_ADVANCE. 1868 * I believe this is an error and it should be never be greateter than 1869 * TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE. */ 1870 max = ip6_temp_preferred_lifetime(ifp->name) - REGEN_ADVANCE; 1871 if (state->desync_factor && !force && state->desync_factor < max) 1872 return; 1873 if (state->desync_factor == 0) 1874 state->desync_factor = 1875 (time_t)arc4random_uniform(MIN(MAX_DESYNC_FACTOR, 1876 (uint32_t)max)); 1877 max = ip6_temp_preferred_lifetime(ifp->name) - 1878 state->desync_factor - REGEN_ADVANCE; 1879 eloop_timeout_add_sec(ifp->ctx->eloop, max, ipv6_regentempifid, ifp); 1880 } 1881 1882 void 1883 ipv6_gentempifid(struct interface *ifp) 1884 { 1885 struct ipv6_state *state; 1886 MD5_CTX md5; 1887 uint8_t seed[16], digest[16]; 1888 int retry; 1889 1890 if ((state = IPV6_STATE(ifp)) == NULL) 1891 return; 1892 1893 retry = 0; 1894 if (memcmp(nullid, state->randomseed0, sizeof(nullid)) == 0) { 1895 uint32_t r; 1896 1897 r = arc4random(); 1898 memcpy(seed, &r, sizeof(r)); 1899 r = arc4random(); 1900 memcpy(seed + sizeof(r), &r, sizeof(r)); 1901 } else 1902 memcpy(seed, state->randomseed0, sizeof(state->randomseed0)); 1903 1904 memcpy(seed + sizeof(state->randomseed0), 1905 state->randomseed1, sizeof(state->randomseed1)); 1906 1907 again: 1908 MD5Init(&md5); 1909 MD5Update(&md5, seed, sizeof(seed)); 1910 MD5Final(digest, &md5); 1911 1912 /* RFC4941 Section 3.2.1.1 1913 * Take the left-most 64bits and set bit 6 to zero */ 1914 memcpy(state->randomid, digest, sizeof(state->randomid)); 1915 state->randomid[0] = (uint8_t)(state->randomid[0] & ~EUI64_UBIT); 1916 1917 /* RFC4941 Section 3.2.1.4 1918 * Reject reserved or existing id's */ 1919 if (memcmp(nullid, state->randomid, sizeof(nullid)) == 0 || 1920 (memcmp(anycastid, state->randomid, 7) == 0 && 1921 (anycastid[7] & state->randomid[7]) == anycastid[7]) || 1922 memcmp(isatapid, state->randomid, sizeof(isatapid)) == 0 || 1923 ipv6_findaddrid(ifp->ctx, state->randomid)) 1924 { 1925 if (++retry < GEN_TEMPID_RETRY_MAX) { 1926 memcpy(seed, digest + 8, 8); 1927 goto again; 1928 } 1929 memset(state->randomid, 0, sizeof(state->randomid)); 1930 } 1931 1932 /* RFC4941 Section 3.2.1.6 1933 * Save the right-most 64bits of the digest */ 1934 memcpy(state->randomseed0, digest + 8, 1935 sizeof(state->randomseed0)); 1936 } 1937 1938 /* RFC4941 Section 3.3.7 */ 1939 static void 1940 ipv6_tempdadcallback(void *arg) 1941 { 1942 struct ipv6_addr *ia = arg; 1943 1944 if (ia->flags & IPV6_AF_DUPLICATED) { 1945 struct ipv6_addr *ia1; 1946 struct timespec tv; 1947 1948 if (++ia->dadcounter == TEMP_IDGEN_RETRIES) { 1949 logerrx("%s: too many duplicate temporary addresses", 1950 ia->iface->name); 1951 return; 1952 } 1953 clock_gettime(CLOCK_MONOTONIC, &tv); 1954 if ((ia1 = ipv6_createtempaddr(ia, &tv)) == NULL) 1955 logerr(__func__); 1956 else 1957 ia1->dadcounter = ia->dadcounter; 1958 ipv6_deleteaddr(ia); 1959 if (ia1) 1960 ipv6_addaddr(ia1, &ia1->acquired); 1961 } 1962 } 1963 1964 struct ipv6_addr * 1965 ipv6_createtempaddr(struct ipv6_addr *ia0, const struct timespec *now) 1966 { 1967 struct ipv6_state *state; 1968 const struct ipv6_state *cstate; 1969 int genid; 1970 struct in6_addr addr, mask; 1971 uint32_t randid[2]; 1972 const struct interface *ifp; 1973 const struct ipv6_addr *ap; 1974 struct ipv6_addr *ia; 1975 uint32_t i, trylimit; 1976 1977 trylimit = TEMP_IDGEN_RETRIES; 1978 state = IPV6_STATE(ia0->iface); 1979 genid = 0; 1980 1981 addr = ia0->addr; 1982 ipv6_mask(&mask, ia0->prefix_len); 1983 /* clear the old ifid */ 1984 for (i = 0; i < 4; i++) 1985 addr.s6_addr32[i] &= mask.s6_addr32[i]; 1986 1987 again: 1988 if (memcmp(state->randomid, nullid, sizeof(nullid)) == 0) 1989 genid = 1; 1990 if (genid) { 1991 memcpy(state->randomseed1, &ia0->addr.s6_addr[8], 1992 sizeof(state->randomseed1)); 1993 ipv6_gentempifid(ia0->iface); 1994 if (memcmp(state->randomid, nullid, sizeof(nullid)) == 0) { 1995 errno = EFAULT; 1996 return NULL; 1997 } 1998 } 1999 memcpy(&randid[0], state->randomid, sizeof(randid[0])); 2000 memcpy(&randid[1], state->randomid + sizeof(randid[1]), 2001 sizeof(randid[2])); 2002 addr.s6_addr32[2] |= randid[0] & ~mask.s6_addr32[2]; 2003 addr.s6_addr32[3] |= randid[1] & ~mask.s6_addr32[3]; 2004 2005 /* Ensure we don't already have it */ 2006 TAILQ_FOREACH(ifp, ia0->iface->ctx->ifaces, next) { 2007 cstate = IPV6_CSTATE(ifp); 2008 if (cstate) { 2009 TAILQ_FOREACH(ap, &cstate->addrs, next) { 2010 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &addr)) { 2011 if (--trylimit == 0) { 2012 errno = EEXIST; 2013 return NULL; 2014 } 2015 genid = 1; 2016 goto again; 2017 } 2018 } 2019 } 2020 } 2021 2022 ia = ipv6_newaddr(ia0->iface, &addr, ia0->prefix_len, 2023 IPV6_AF_AUTOCONF | IPV6_AF_TEMPORARY); 2024 /* Must be made tentative, for our DaD to work */ 2025 ia->addr_flags = IN6_IFF_TENTATIVE; 2026 ia->dadcallback = ipv6_tempdadcallback; 2027 ia->created = ia->acquired = now ? *now : ia0->acquired; 2028 2029 /* Ensure desync is still valid */ 2030 ipv6_regen_desync(ia->iface, 0); 2031 2032 /* RFC4941 Section 3.3.4 */ 2033 i = (uint32_t)(ip6_temp_preferred_lifetime(ia0->iface->name) - 2034 state->desync_factor); 2035 ia->prefix_pltime = MIN(ia0->prefix_pltime, i); 2036 i = (uint32_t)ip6_temp_valid_lifetime(ia0->iface->name); 2037 ia->prefix_vltime = MIN(ia0->prefix_vltime, i); 2038 if (ia->prefix_pltime <= REGEN_ADVANCE || 2039 ia->prefix_pltime > ia0->prefix_vltime) 2040 { 2041 errno = EINVAL; 2042 free(ia); 2043 return NULL; 2044 } 2045 2046 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 2047 return ia; 2048 } 2049 2050 struct ipv6_addr * 2051 ipv6_settemptime(struct ipv6_addr *ia, int flags) 2052 { 2053 struct ipv6_state *state; 2054 struct ipv6_addr *ap, *first; 2055 2056 state = IPV6_STATE(ia->iface); 2057 first = NULL; 2058 TAILQ_FOREACH_REVERSE(ap, &state->addrs, ipv6_addrhead, next) { 2059 if (ap->flags & IPV6_AF_TEMPORARY && 2060 ap->prefix_pltime && 2061 IN6_ARE_ADDR_EQUAL(&ia->prefix, &ap->prefix)) 2062 { 2063 time_t max, ext; 2064 2065 if (flags == 0) { 2066 if (ap->prefix_pltime - 2067 (uint32_t)(ia->acquired.tv_sec - 2068 ap->acquired.tv_sec) 2069 < REGEN_ADVANCE) 2070 continue; 2071 2072 return ap; 2073 } 2074 2075 if (!(ap->flags & IPV6_AF_ADDED)) 2076 ap->flags |= IPV6_AF_NEW | IPV6_AF_AUTOCONF; 2077 ap->flags &= ~IPV6_AF_STALE; 2078 2079 /* RFC4941 Section 3.4 2080 * Deprecated prefix, deprecate the temporary address */ 2081 if (ia->prefix_pltime == 0) { 2082 ap->prefix_pltime = 0; 2083 goto valid; 2084 } 2085 2086 /* Ensure desync is still valid */ 2087 ipv6_regen_desync(ap->iface, 0); 2088 2089 /* RFC4941 Section 3.3.2 2090 * Extend temporary times, but ensure that they 2091 * never last beyond the system limit. */ 2092 ext = ia->acquired.tv_sec + (time_t)ia->prefix_pltime; 2093 max = ap->created.tv_sec + 2094 ip6_temp_preferred_lifetime(ap->iface->name) - 2095 state->desync_factor; 2096 if (ext < max) 2097 ap->prefix_pltime = ia->prefix_pltime; 2098 else 2099 ap->prefix_pltime = 2100 (uint32_t)(max - ia->acquired.tv_sec); 2101 2102 valid: 2103 ext = ia->acquired.tv_sec + (time_t)ia->prefix_vltime; 2104 max = ap->created.tv_sec + 2105 ip6_temp_valid_lifetime(ap->iface->name); 2106 if (ext < max) 2107 ap->prefix_vltime = ia->prefix_vltime; 2108 else 2109 ap->prefix_vltime = 2110 (uint32_t)(max - ia->acquired.tv_sec); 2111 2112 /* Just extend the latest matching prefix */ 2113 ap->acquired = ia->acquired; 2114 2115 /* If extending return the last match as 2116 * it's the most current. 2117 * If deprecating, deprecate any other addresses we 2118 * may have, although this should not be needed */ 2119 if (ia->prefix_pltime) 2120 return ap; 2121 if (first == NULL) 2122 first = ap; 2123 } 2124 } 2125 return first; 2126 } 2127 2128 void 2129 ipv6_addtempaddrs(struct interface *ifp, const struct timespec *now) 2130 { 2131 struct ipv6_state *state; 2132 struct ipv6_addr *ia; 2133 2134 state = IPV6_STATE(ifp); 2135 TAILQ_FOREACH(ia, &state->addrs, next) { 2136 if (ia->flags & IPV6_AF_TEMPORARY && 2137 !(ia->flags & IPV6_AF_STALE)) 2138 ipv6_addaddr(ia, now); 2139 } 2140 } 2141 2142 static void 2143 ipv6_regentempaddr(void *arg) 2144 { 2145 struct ipv6_addr *ia = arg, *ia1; 2146 struct timespec tv; 2147 2148 logdebugx("%s: regen temp addr %s", ia->iface->name, ia->saddr); 2149 clock_gettime(CLOCK_MONOTONIC, &tv); 2150 ia1 = ipv6_createtempaddr(ia, &tv); 2151 if (ia1) 2152 ipv6_addaddr(ia1, &tv); 2153 else 2154 logerr(__func__); 2155 } 2156 2157 static void 2158 ipv6_regentempifid(void *arg) 2159 { 2160 struct interface *ifp = arg; 2161 struct ipv6_state *state; 2162 2163 state = IPV6_STATE(ifp); 2164 if (memcmp(state->randomid, nullid, sizeof(state->randomid))) 2165 ipv6_gentempifid(ifp); 2166 2167 ipv6_regen_desync(ifp, 1); 2168 } 2169 #endif /* IPV6_MANAGETEMPADDR */ 2170 2171 void 2172 ipv6_markaddrsstale(struct interface *ifp, unsigned int flags) 2173 { 2174 struct ipv6_state *state; 2175 struct ipv6_addr *ia; 2176 2177 state = IPV6_STATE(ifp); 2178 if (state == NULL) 2179 return; 2180 2181 TAILQ_FOREACH(ia, &state->addrs, next) { 2182 if (flags == 0 || ia->flags & flags) 2183 ia->flags |= IPV6_AF_STALE; 2184 } 2185 } 2186 2187 void 2188 ipv6_deletestaleaddrs(struct interface *ifp) 2189 { 2190 struct ipv6_state *state; 2191 struct ipv6_addr *ia, *ia1; 2192 2193 state = IPV6_STATE(ifp); 2194 if (state == NULL) 2195 return; 2196 2197 TAILQ_FOREACH_SAFE(ia, &state->addrs, next, ia1) { 2198 if (ia->flags & IPV6_AF_STALE) 2199 ipv6_handleifa(ifp->ctx, RTM_DELADDR, 2200 ifp->ctx->ifaces, ifp->name, 2201 &ia->addr, ia->prefix_len, 0, getpid()); 2202 } 2203 } 2204 2205 2206 static struct rt * 2207 inet6_makeroute(struct interface *ifp, const struct ra *rap) 2208 { 2209 struct rt *rt; 2210 2211 if ((rt = rt_new(ifp)) == NULL) 2212 return NULL; 2213 2214 #ifdef HAVE_ROUTE_METRIC 2215 rt->rt_metric = ifp->metric; 2216 #endif 2217 if (rap != NULL) 2218 rt->rt_mtu = rap->mtu; 2219 return rt; 2220 } 2221 2222 static struct rt * 2223 inet6_makeprefix(struct interface *ifp, const struct ra *rap, 2224 const struct ipv6_addr *addr) 2225 { 2226 struct rt *rt; 2227 struct in6_addr netmask; 2228 2229 if (addr == NULL || addr->prefix_len > 128) { 2230 errno = EINVAL; 2231 return NULL; 2232 } 2233 2234 /* There is no point in trying to manage a /128 prefix, 2235 * ones without a lifetime. */ 2236 if (addr->prefix_len == 128 || addr->prefix_vltime == 0) 2237 return NULL; 2238 2239 /* Don't install a reject route when not creating bigger prefixes. */ 2240 if (addr->flags & IPV6_AF_NOREJECT) 2241 return NULL; 2242 2243 /* This address is the delegated prefix, so add a reject route for 2244 * it via the loopback interface. */ 2245 if (addr->flags & IPV6_AF_DELEGATEDPFX) { 2246 struct interface *lo0; 2247 2248 TAILQ_FOREACH(lo0, ifp->ctx->ifaces, next) { 2249 if (lo0->flags & IFF_LOOPBACK) 2250 break; 2251 } 2252 if (lo0 == NULL) 2253 logwarnx("cannot find a loopback interface " 2254 "to reject via"); 2255 else 2256 ifp = lo0; 2257 } 2258 2259 if ((rt = inet6_makeroute(ifp, rap)) == NULL) 2260 return NULL; 2261 2262 sa_in6_init(&rt->rt_dest, &addr->prefix); 2263 ipv6_mask(&netmask, addr->prefix_len); 2264 sa_in6_init(&rt->rt_netmask, &netmask); 2265 if (addr->flags & IPV6_AF_DELEGATEDPFX) { 2266 rt->rt_flags |= RTF_REJECT; 2267 /* Linux does not like a gateway for a reject route. */ 2268 #ifndef __linux__ 2269 sa_in6_init(&rt->rt_gateway, &in6addr_loopback); 2270 #endif 2271 } else if (!(addr->flags & IPV6_AF_ONLINK)) 2272 sa_in6_init(&rt->rt_gateway, &rap->from); 2273 else 2274 rt->rt_gateway.sa_family = AF_UNSPEC; 2275 sa_in6_init(&rt->rt_ifa, &addr->addr); 2276 return rt; 2277 } 2278 2279 static struct rt * 2280 inet6_makerouter(struct ra *rap) 2281 { 2282 struct rt *rt; 2283 2284 if ((rt = inet6_makeroute(rap->iface, rap)) == NULL) 2285 return NULL; 2286 sa_in6_init(&rt->rt_dest, &in6addr_any); 2287 sa_in6_init(&rt->rt_netmask, &in6addr_any); 2288 sa_in6_init(&rt->rt_gateway, &rap->from); 2289 return rt; 2290 } 2291 2292 #define RT_IS_DEFAULT(rtp) \ 2293 (IN6_ARE_ADDR_EQUAL(&((rtp)->dest), &in6addr_any) && \ 2294 IN6_ARE_ADDR_EQUAL(&((rtp)->mask), &in6addr_any)) 2295 2296 static int 2297 inet6_staticroutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx) 2298 { 2299 struct interface *ifp; 2300 struct ipv6_state *state; 2301 struct ipv6_addr *ia; 2302 struct rt *rt; 2303 2304 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2305 if ((state = IPV6_STATE(ifp)) == NULL) 2306 continue; 2307 TAILQ_FOREACH(ia, &state->addrs, next) { 2308 if ((ia->flags & (IPV6_AF_ADDED | IPV6_AF_STATIC)) == 2309 (IPV6_AF_ADDED | IPV6_AF_STATIC)) 2310 { 2311 rt = inet6_makeprefix(ifp, NULL, ia); 2312 if (rt) 2313 rt_proto_add(routes, rt); 2314 } 2315 } 2316 } 2317 return 0; 2318 } 2319 2320 static int 2321 inet6_raroutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx) 2322 { 2323 struct rt *rt; 2324 struct ra *rap; 2325 const struct ipv6_addr *addr; 2326 2327 TAILQ_FOREACH(rap, ctx->ra_routers, next) { 2328 if (rap->expired) 2329 continue; 2330 TAILQ_FOREACH(addr, &rap->addrs, next) { 2331 if (addr->prefix_vltime == 0) 2332 continue; 2333 rt = inet6_makeprefix(rap->iface, rap, addr); 2334 if (rt) { 2335 rt->rt_dflags |= RTDF_RA; 2336 rt_proto_add(routes, rt); 2337 } 2338 } 2339 if (rap->lifetime == 0) 2340 continue; 2341 if (ipv6_anyglobal(rap->iface) == NULL) 2342 continue; 2343 rt = inet6_makerouter(rap); 2344 if (rt == NULL) 2345 continue; 2346 rt->rt_dflags |= RTDF_RA; 2347 rt_proto_add(routes, rt); 2348 } 2349 return 0; 2350 } 2351 2352 #ifdef DHCP6 2353 static int 2354 inet6_dhcproutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx, 2355 enum DH6S dstate) 2356 { 2357 struct interface *ifp; 2358 const struct dhcp6_state *d6_state; 2359 const struct ipv6_addr *addr; 2360 struct rt *rt; 2361 2362 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2363 d6_state = D6_CSTATE(ifp); 2364 if (d6_state && d6_state->state == dstate) { 2365 TAILQ_FOREACH(addr, &d6_state->addrs, next) { 2366 rt = inet6_makeprefix(ifp, NULL, addr); 2367 if (rt == NULL) 2368 continue; 2369 rt->rt_dflags |= RTDF_DHCP; 2370 rt_proto_add(routes, rt); 2371 } 2372 } 2373 } 2374 return 0; 2375 } 2376 #endif 2377 2378 bool 2379 inet6_getroutes(struct dhcpcd_ctx *ctx, rb_tree_t *routes) 2380 { 2381 2382 /* Should static take priority? */ 2383 if (inet6_staticroutes(routes, ctx) == -1) 2384 return false; 2385 2386 /* First add reachable routers and their prefixes */ 2387 if (inet6_raroutes(routes, ctx) == -1) 2388 return false; 2389 2390 #ifdef DHCP6 2391 /* We have no way of knowing if prefixes added by DHCP are reachable 2392 * or not, so we have to assume they are. 2393 * Add bound before delegated so we can prefer interfaces better. */ 2394 if (inet6_dhcproutes(routes, ctx, DH6S_BOUND) == -1) 2395 return false; 2396 if (inet6_dhcproutes(routes, ctx, DH6S_DELEGATED) == -1) 2397 return false; 2398 #endif 2399 2400 return true; 2401 } 2402