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_ifanyglobal(struct interface *ifp) 1069 { 1070 struct ipv6_state *state; 1071 struct ipv6_addr *ia; 1072 1073 if (ifp->carrier == LINK_DOWN) 1074 return NULL; 1075 1076 state = IPV6_STATE(ifp); 1077 if (state == NULL) 1078 return NULL; 1079 1080 TAILQ_FOREACH(ia, &state->addrs, next) { 1081 if (IN6_IS_ADDR_LINKLOCAL(&ia->addr)) 1082 continue; 1083 /* Let's be optimistic. 1084 * Any decent OS won't forward or accept traffic 1085 * from/to tentative or detached addresses. */ 1086 if (!(ia->addr_flags & IN6_IFF_DUPLICATED)) 1087 break; 1088 } 1089 return ia; 1090 } 1091 1092 void 1093 ipv6_handleifa(struct dhcpcd_ctx *ctx, 1094 int cmd, struct if_head *ifs, const char *ifname, 1095 const struct in6_addr *addr, uint8_t prefix_len, int addrflags, pid_t pid) 1096 { 1097 struct interface *ifp; 1098 struct ipv6_state *state; 1099 struct ipv6_addr *ia; 1100 struct ll_callback *cb; 1101 bool anyglobal; 1102 1103 #ifdef __sun 1104 struct sockaddr_in6 subnet; 1105 1106 /* Solaris on-link route is an unspecified address! */ 1107 if (IN6_IS_ADDR_UNSPECIFIED(addr)) { 1108 if (if_getsubnet(ctx, ifname, AF_INET6, 1109 &subnet, sizeof(subnet)) == -1) 1110 { 1111 logerr(__func__); 1112 return; 1113 } 1114 addr = &subnet.sin6_addr; 1115 } 1116 #endif 1117 1118 #if 0 1119 char dbuf[INET6_ADDRSTRLEN]; 1120 const char *dbp; 1121 1122 dbp = inet_ntop(AF_INET6, &addr->s6_addr, 1123 dbuf, INET6_ADDRSTRLEN); 1124 loginfox("%s: cmd %d addr %s addrflags %d", 1125 ifname, cmd, dbp, addrflags); 1126 #endif 1127 1128 if (ifs == NULL) 1129 ifs = ctx->ifaces; 1130 if (ifs == NULL) 1131 return; 1132 if ((ifp = if_find(ifs, ifname)) == NULL) 1133 return; 1134 if ((state = ipv6_getstate(ifp)) == NULL) 1135 return; 1136 anyglobal = ipv6_ifanyglobal(ifp) != NULL; 1137 1138 TAILQ_FOREACH(ia, &state->addrs, next) { 1139 if (IN6_ARE_ADDR_EQUAL(&ia->addr, addr)) 1140 break; 1141 } 1142 1143 switch (cmd) { 1144 case RTM_DELADDR: 1145 if (ia != NULL) { 1146 TAILQ_REMOVE(&state->addrs, ia, next); 1147 #ifdef ND6_ADVERTISE 1148 /* Advertise the address if it exists on 1149 * another interface. */ 1150 ipv6nd_advertise(ia); 1151 #endif 1152 /* We'll free it at the end of the function. */ 1153 } 1154 break; 1155 case RTM_NEWADDR: 1156 if (ia == NULL) { 1157 ia = ipv6_newaddr(ifp, addr, prefix_len, 0); 1158 #ifdef ALIAS_ADDR 1159 strlcpy(ia->alias, ifname, sizeof(ia->alias)); 1160 #endif 1161 if (if_getlifetime6(ia) == -1) { 1162 /* No support or address vanished. 1163 * Either way, just set a deprecated 1164 * infinite time lifetime and continue. 1165 * This is fine because we only want 1166 * to know this when trying to extend 1167 * temporary addresses. 1168 * As we can't extend infinite, we'll 1169 * create a new temporary address. */ 1170 ia->prefix_pltime = 0; 1171 ia->prefix_vltime = 1172 ND6_INFINITE_LIFETIME; 1173 } 1174 /* This is a minor regression against RFC 4941 1175 * because the kernel only knows when the 1176 * lifetimes were last updated, not when the 1177 * address was initially created. 1178 * Provided dhcpcd is not restarted, this 1179 * won't be a problem. 1180 * If we don't like it, we can always 1181 * pretend lifetimes are infinite and always 1182 * generate a new temporary address on 1183 * restart. */ 1184 ia->acquired = ia->created; 1185 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 1186 } 1187 ia->addr_flags = addrflags; 1188 ia->flags &= ~IPV6_AF_STALE; 1189 #ifdef IPV6_MANAGETEMPADDR 1190 if (ia->addr_flags & IN6_IFF_TEMPORARY) 1191 ia->flags |= IPV6_AF_TEMPORARY; 1192 #endif 1193 if (IN6_IS_ADDR_LINKLOCAL(&ia->addr) || ia->dadcallback) { 1194 #ifdef IPV6_POLLADDRFLAG 1195 if (ia->addr_flags & IN6_IFF_TENTATIVE) { 1196 struct timespec tv; 1197 1198 ms_to_ts(&tv, RETRANS_TIMER / 2); 1199 eloop_timeout_add_tv( 1200 ia->iface->ctx->eloop, 1201 &tv, ipv6_checkaddrflags, ia); 1202 break; 1203 } 1204 #endif 1205 1206 if (ia->dadcallback) { 1207 ia->dadcallback(ia); 1208 if (ctx->options & DHCPCD_FORKED) 1209 goto out; 1210 } 1211 1212 if (IN6_IS_ADDR_LINKLOCAL(&ia->addr) && 1213 !(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1214 { 1215 /* Now run any callbacks. 1216 * Typically IPv6RS or DHCPv6 */ 1217 while ((cb = 1218 TAILQ_FIRST(&state->ll_callbacks))) 1219 { 1220 TAILQ_REMOVE( 1221 &state->ll_callbacks, 1222 cb, next); 1223 cb->callback(cb->arg); 1224 free(cb); 1225 if (ctx->options & DHCPCD_FORKED) 1226 goto out; 1227 } 1228 } 1229 } 1230 break; 1231 } 1232 1233 if (ia == NULL) 1234 return; 1235 1236 ctx->options &= ~DHCPCD_RTBUILD; 1237 ipv6nd_handleifa(cmd, ia, pid); 1238 #ifdef DHCP6 1239 dhcp6_handleifa(cmd, ia, pid); 1240 #endif 1241 1242 out: 1243 /* Done with the ia now, so free it. */ 1244 if (cmd == RTM_DELADDR) 1245 ipv6_freeaddr(ia); 1246 else if (!(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1247 ia->flags |= IPV6_AF_DADCOMPLETED; 1248 1249 /* If we've not already called rt_build via the IPv6ND 1250 * or DHCP6 handlers and the existance of any useable 1251 * global address on the interface has changed, 1252 * call rt_build to add/remove the default route. */ 1253 if (ifp->active && ifp->options->options & DHCPCD_IPV6 && 1254 !(ctx->options & DHCPCD_RTBUILD) && 1255 (ipv6_ifanyglobal(ifp) != NULL) != anyglobal) 1256 rt_build(ctx, AF_INET6); 1257 } 1258 1259 int 1260 ipv6_hasaddr(const struct interface *ifp) 1261 { 1262 1263 if (ipv6nd_iffindaddr(ifp, NULL, 0) != NULL) 1264 return 1; 1265 #ifdef DHCP6 1266 if (dhcp6_iffindaddr(ifp, NULL, 0) != NULL) 1267 return 1; 1268 #endif 1269 return 0; 1270 } 1271 1272 struct ipv6_addr * 1273 ipv6_iffindaddr(struct interface *ifp, const struct in6_addr *addr, 1274 int revflags) 1275 { 1276 struct ipv6_state *state; 1277 struct ipv6_addr *ap; 1278 1279 state = IPV6_STATE(ifp); 1280 if (state) { 1281 TAILQ_FOREACH(ap, &state->addrs, next) { 1282 if (addr == NULL) { 1283 if (IN6_IS_ADDR_LINKLOCAL(&ap->addr) && 1284 (!revflags || !(ap->addr_flags & revflags))) 1285 return ap; 1286 } else { 1287 if (IN6_ARE_ADDR_EQUAL(&ap->addr, addr) && 1288 (!revflags || !(ap->addr_flags & revflags))) 1289 return ap; 1290 } 1291 } 1292 } 1293 return NULL; 1294 } 1295 1296 static struct ipv6_addr * 1297 ipv6_iffindmaskaddr(const struct interface *ifp, const struct in6_addr *addr) 1298 { 1299 struct ipv6_state *state; 1300 struct ipv6_addr *ap; 1301 struct in6_addr mask; 1302 1303 state = IPV6_STATE(ifp); 1304 if (state) { 1305 TAILQ_FOREACH(ap, &state->addrs, next) { 1306 if (ipv6_mask(&mask, ap->prefix_len) == -1) 1307 continue; 1308 if (IN6_ARE_MASKED_ADDR_EQUAL(&ap->addr, addr, &mask)) 1309 return ap; 1310 } 1311 } 1312 return NULL; 1313 } 1314 1315 struct ipv6_addr * 1316 ipv6_findmaskaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr) 1317 { 1318 struct interface *ifp; 1319 struct ipv6_addr *ap; 1320 1321 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1322 ap = ipv6_iffindmaskaddr(ifp, addr); 1323 if (ap != NULL) 1324 return ap; 1325 } 1326 return NULL; 1327 } 1328 1329 int 1330 ipv6_addlinklocalcallback(struct interface *ifp, 1331 void (*callback)(void *), void *arg) 1332 { 1333 struct ipv6_state *state; 1334 struct ll_callback *cb; 1335 1336 state = ipv6_getstate(ifp); 1337 TAILQ_FOREACH(cb, &state->ll_callbacks, next) { 1338 if (cb->callback == callback && cb->arg == arg) 1339 break; 1340 } 1341 if (cb == NULL) { 1342 cb = malloc(sizeof(*cb)); 1343 if (cb == NULL) { 1344 logerr(__func__); 1345 return -1; 1346 } 1347 cb->callback = callback; 1348 cb->arg = arg; 1349 TAILQ_INSERT_TAIL(&state->ll_callbacks, cb, next); 1350 } 1351 return 0; 1352 } 1353 1354 static struct ipv6_addr * 1355 ipv6_newlinklocal(struct interface *ifp) 1356 { 1357 struct ipv6_addr *ia; 1358 struct in6_addr in6; 1359 1360 memset(&in6, 0, sizeof(in6)); 1361 in6.s6_addr32[0] = htonl(0xfe800000); 1362 ia = ipv6_newaddr(ifp, &in6, 64, 0); 1363 if (ia != NULL) { 1364 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1365 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1366 } 1367 return ia; 1368 } 1369 1370 static const uint8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 }; 1371 static const uint8_t allone[8] = 1372 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; 1373 1374 static int 1375 ipv6_addlinklocal(struct interface *ifp) 1376 { 1377 struct ipv6_state *state; 1378 struct ipv6_addr *ap, *ap2; 1379 int dadcounter; 1380 1381 /* Check sanity before malloc */ 1382 if (!(ifp->options->options & DHCPCD_SLAACPRIVATE)) { 1383 switch (ifp->family) { 1384 case ARPHRD_ETHER: 1385 /* Check for a valid hardware address */ 1386 if (ifp->hwlen != 6 && ifp->hwlen != 8) { 1387 errno = ENOTSUP; 1388 return -1; 1389 } 1390 if (memcmp(ifp->hwaddr, allzero, ifp->hwlen) == 0 || 1391 memcmp(ifp->hwaddr, allone, ifp->hwlen) == 0) 1392 { 1393 errno = EINVAL; 1394 return -1; 1395 } 1396 break; 1397 default: 1398 errno = ENOTSUP; 1399 return -1; 1400 } 1401 } 1402 1403 state = ipv6_getstate(ifp); 1404 if (state == NULL) 1405 return -1; 1406 1407 ap = ipv6_newlinklocal(ifp); 1408 if (ap == NULL) 1409 return -1; 1410 1411 dadcounter = 0; 1412 if (ifp->options->options & DHCPCD_SLAACPRIVATE) { 1413 nextslaacprivate: 1414 if (ipv6_makestableprivate(&ap->addr, 1415 &ap->prefix, ap->prefix_len, ifp, &dadcounter) == -1) 1416 { 1417 free(ap); 1418 return -1; 1419 } 1420 ap->dadcounter = dadcounter; 1421 } else { 1422 memcpy(ap->addr.s6_addr, ap->prefix.s6_addr, 8); 1423 switch (ifp->family) { 1424 case ARPHRD_ETHER: 1425 if (ifp->hwlen == 6) { 1426 ap->addr.s6_addr[ 8] = ifp->hwaddr[0]; 1427 ap->addr.s6_addr[ 9] = ifp->hwaddr[1]; 1428 ap->addr.s6_addr[10] = ifp->hwaddr[2]; 1429 ap->addr.s6_addr[11] = 0xff; 1430 ap->addr.s6_addr[12] = 0xfe; 1431 ap->addr.s6_addr[13] = ifp->hwaddr[3]; 1432 ap->addr.s6_addr[14] = ifp->hwaddr[4]; 1433 ap->addr.s6_addr[15] = ifp->hwaddr[5]; 1434 } else if (ifp->hwlen == 8) 1435 memcpy(&ap->addr.s6_addr[8], ifp->hwaddr, 8); 1436 else { 1437 free(ap); 1438 errno = ENOTSUP; 1439 return -1; 1440 } 1441 break; 1442 } 1443 1444 /* Sanity check: g bit must not indciate "group" */ 1445 if (EUI64_GROUP(&ap->addr)) { 1446 free(ap); 1447 errno = EINVAL; 1448 return -1; 1449 } 1450 EUI64_TO_IFID(&ap->addr); 1451 } 1452 1453 /* Do we already have this address? */ 1454 TAILQ_FOREACH(ap2, &state->addrs, next) { 1455 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &ap2->addr)) { 1456 if (ap2->addr_flags & IN6_IFF_DUPLICATED) { 1457 if (ifp->options->options & 1458 DHCPCD_SLAACPRIVATE) 1459 { 1460 dadcounter++; 1461 goto nextslaacprivate; 1462 } 1463 free(ap); 1464 errno = EADDRNOTAVAIL; 1465 return -1; 1466 } 1467 1468 logwarnx("%s: waiting for %s to complete", 1469 ap2->iface->name, ap2->saddr); 1470 free(ap); 1471 errno = EEXIST; 1472 return 0; 1473 } 1474 } 1475 1476 inet_ntop(AF_INET6, &ap->addr, ap->saddr, sizeof(ap->saddr)); 1477 TAILQ_INSERT_TAIL(&state->addrs, ap, next); 1478 ipv6_addaddr(ap, NULL); 1479 return 1; 1480 } 1481 1482 static int 1483 ipv6_tryaddlinklocal(struct interface *ifp) 1484 { 1485 struct ipv6_addr *ia; 1486 1487 /* We can't assign a link-locak address to this, 1488 * the ppp process has to. */ 1489 if (ifp->flags & IFF_POINTOPOINT) 1490 return 0; 1491 1492 ia = ipv6_iffindaddr(ifp, NULL, IN6_IFF_DUPLICATED); 1493 if (ia != NULL) { 1494 #ifdef IPV6_POLLADDRFLAG 1495 if (ia->addr_flags & IN6_IFF_TENTATIVE) { 1496 struct timespec tv; 1497 1498 ms_to_ts(&tv, RETRANS_TIMER / 2); 1499 eloop_timeout_add_tv( 1500 ia->iface->ctx->eloop, 1501 &tv, ipv6_checkaddrflags, ia); 1502 } 1503 #endif 1504 return 0; 1505 } 1506 if (!CAN_ADD_LLADDR(ifp)) 1507 return 0; 1508 1509 return ipv6_addlinklocal(ifp); 1510 } 1511 1512 struct ipv6_addr * 1513 ipv6_newaddr(struct interface *ifp, const struct in6_addr *addr, 1514 uint8_t prefix_len, unsigned int flags) 1515 { 1516 struct ipv6_addr *ia; 1517 char buf[INET6_ADDRSTRLEN]; 1518 const char *cbp; 1519 bool tempaddr; 1520 int addr_flags; 1521 1522 /* If adding a new DHCP / RA derived address, check current flags 1523 * from an existing address. */ 1524 ia = ipv6_iffindaddr(ifp, addr, 0); 1525 if (ia != NULL) 1526 addr_flags = ia->addr_flags; 1527 else 1528 addr_flags = IN6_IFF_TENTATIVE; 1529 1530 ia = calloc(1, sizeof(*ia)); 1531 if (ia == NULL) 1532 goto err; 1533 1534 ia->iface = ifp; 1535 ia->addr_flags = addr_flags; 1536 ia->flags = IPV6_AF_NEW | flags; 1537 if (!(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1538 ia->flags |= IPV6_AF_DADCOMPLETED; 1539 ia->prefix_len = prefix_len; 1540 ia->dhcp6_fd = -1; 1541 1542 #ifdef IPV6_AF_TEMPORARY 1543 tempaddr = ia->flags & IPV6_AF_TEMPORARY; 1544 #else 1545 tempaddr = false; 1546 #endif 1547 1548 if (ia->flags & IPV6_AF_AUTOCONF && !tempaddr) { 1549 ia->prefix = *addr; 1550 ia->dadcounter = ipv6_makeaddr(&ia->addr, ifp, 1551 &ia->prefix, 1552 ia->prefix_len); 1553 if (ia->dadcounter == -1) 1554 goto err; 1555 } else if (ia->flags & IPV6_AF_RAPFX) { 1556 ia->prefix = *addr; 1557 #ifdef __sun 1558 ia->addr = *addr; 1559 cbp = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); 1560 goto paddr; 1561 #else 1562 return ia; 1563 #endif 1564 } else if (ia->flags & (IPV6_AF_REQUEST | IPV6_AF_DELEGATEDPFX) && 1565 prefix_len != 128) 1566 { 1567 ia->prefix = *addr; 1568 cbp = inet_ntop(AF_INET6, &ia->prefix, buf, sizeof(buf)); 1569 goto paddr; 1570 } else { 1571 ia->addr = *addr; 1572 if (ipv6_makeprefix(&ia->prefix, 1573 &ia->addr, ia->prefix_len) == -1) 1574 goto err; 1575 } 1576 1577 cbp = inet_ntop(AF_INET6, &ia->addr, buf, sizeof(buf)); 1578 paddr: 1579 if (cbp == NULL) 1580 goto err; 1581 snprintf(ia->saddr, sizeof(ia->saddr), "%s/%d", cbp, ia->prefix_len); 1582 1583 return ia; 1584 1585 err: 1586 logerr(__func__); 1587 free(ia); 1588 return NULL; 1589 } 1590 1591 static void 1592 ipv6_staticdadcallback(void *arg) 1593 { 1594 struct ipv6_addr *ia = arg; 1595 int wascompleted; 1596 1597 wascompleted = (ia->flags & IPV6_AF_DADCOMPLETED); 1598 ia->flags |= IPV6_AF_DADCOMPLETED; 1599 if (ia->flags & IPV6_AF_DUPLICATED) 1600 logwarnx("%s: DAD detected %s", ia->iface->name, 1601 ia->saddr); 1602 else if (!wascompleted) { 1603 logdebugx("%s: IPv6 static DAD completed", 1604 ia->iface->name); 1605 } 1606 1607 #define FINISHED (IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED) 1608 if (!wascompleted) { 1609 struct interface *ifp; 1610 struct ipv6_state *state; 1611 1612 ifp = ia->iface; 1613 state = IPV6_STATE(ifp); 1614 TAILQ_FOREACH(ia, &state->addrs, next) { 1615 if (ia->flags & IPV6_AF_STATIC && 1616 (ia->flags & FINISHED) != FINISHED) 1617 { 1618 wascompleted = 1; 1619 break; 1620 } 1621 } 1622 if (!wascompleted) 1623 script_runreason(ifp, "STATIC6"); 1624 } 1625 #undef FINISHED 1626 } 1627 1628 ssize_t 1629 ipv6_env(FILE *fp, const char *prefix, const struct interface *ifp) 1630 { 1631 struct ipv6_addr *ia; 1632 1633 ia = ipv6_iffindaddr(UNCONST(ifp), &ifp->options->req_addr6, 1634 IN6_IFF_NOTUSEABLE); 1635 if (ia == NULL) 1636 return 0; 1637 if (efprintf(fp, "%s_ip6_address=%s", prefix, ia->saddr) == -1) 1638 return -1; 1639 return 1; 1640 } 1641 1642 int 1643 ipv6_staticdadcompleted(const struct interface *ifp) 1644 { 1645 const struct ipv6_state *state; 1646 const struct ipv6_addr *ia; 1647 int n; 1648 1649 if ((state = IPV6_CSTATE(ifp)) == NULL) 1650 return 0; 1651 n = 0; 1652 #define COMPLETED (IPV6_AF_STATIC | IPV6_AF_ADDED | IPV6_AF_DADCOMPLETED) 1653 TAILQ_FOREACH(ia, &state->addrs, next) { 1654 if ((ia->flags & COMPLETED) == COMPLETED && 1655 !(ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1656 n++; 1657 } 1658 return n; 1659 } 1660 1661 int 1662 ipv6_startstatic(struct interface *ifp) 1663 { 1664 struct ipv6_addr *ia; 1665 int run_script; 1666 1667 if (IN6_IS_ADDR_UNSPECIFIED(&ifp->options->req_addr6)) 1668 return 0; 1669 1670 ia = ipv6_iffindaddr(ifp, &ifp->options->req_addr6, 0); 1671 if (ia != NULL && 1672 (ia->prefix_len != ifp->options->req_prefix_len || 1673 ia->addr_flags & IN6_IFF_NOTUSEABLE)) 1674 { 1675 ipv6_deleteaddr(ia); 1676 ia = NULL; 1677 } 1678 if (ia == NULL) { 1679 struct ipv6_state *state; 1680 1681 ia = ipv6_newaddr(ifp, &ifp->options->req_addr6, 1682 ifp->options->req_prefix_len, 0); 1683 if (ia == NULL) 1684 return -1; 1685 state = IPV6_STATE(ifp); 1686 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 1687 run_script = 0; 1688 } else 1689 run_script = 1; 1690 ia->flags |= IPV6_AF_STATIC | IPV6_AF_ONLINK; 1691 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1692 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1693 ia->dadcallback = ipv6_staticdadcallback; 1694 ipv6_addaddr(ia, NULL); 1695 rt_build(ifp->ctx, AF_INET6); 1696 if (run_script) 1697 script_runreason(ifp, "STATIC6"); 1698 return 1; 1699 } 1700 1701 /* Ensure the interface has a link-local address */ 1702 int 1703 ipv6_start(struct interface *ifp) 1704 { 1705 #ifdef IPV6_POLLADDRFLAG 1706 struct ipv6_state *state; 1707 1708 /* We need to update the address flags. */ 1709 if ((state = IPV6_STATE(ifp)) != NULL) { 1710 struct ipv6_addr *ia; 1711 const char *alias; 1712 int flags; 1713 1714 TAILQ_FOREACH(ia, &state->addrs, next) { 1715 #ifdef ALIAS_ADDR 1716 alias = ia->alias; 1717 #else 1718 alias = NULL; 1719 #endif 1720 flags = if_addrflags6(ia->iface, &ia->addr, alias); 1721 if (flags != -1) 1722 ia->addr_flags = flags; 1723 } 1724 } 1725 #endif 1726 1727 if (ipv6_tryaddlinklocal(ifp) == -1) 1728 return -1; 1729 1730 if (IPV6_CSTATE(ifp)) { 1731 /* Regenerate new ids */ 1732 if (ip6_use_tempaddr(ifp->name)) 1733 ipv6_regentempifid(ifp); 1734 } 1735 1736 return 0; 1737 } 1738 1739 void 1740 ipv6_freedrop(struct interface *ifp, int drop) 1741 { 1742 struct ipv6_state *state; 1743 struct ll_callback *cb; 1744 1745 if (ifp == NULL) 1746 return; 1747 1748 if ((state = IPV6_STATE(ifp)) == NULL) 1749 return; 1750 1751 /* If we got here, we can get rid of any LL callbacks. */ 1752 while ((cb = TAILQ_FIRST(&state->ll_callbacks))) { 1753 TAILQ_REMOVE(&state->ll_callbacks, cb, next); 1754 free(cb); 1755 } 1756 1757 ipv6_freedrop_addrs(&state->addrs, drop ? 2 : 0, NULL); 1758 if (drop) { 1759 if (ifp->ctx->ra_routers != NULL) 1760 rt_build(ifp->ctx, AF_INET6); 1761 } else { 1762 /* Because we need to cache the addresses we don't control, 1763 * we only free the state on when NOT dropping addresses. */ 1764 free(state); 1765 ifp->if_data[IF_DATA_IPV6] = NULL; 1766 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 1767 } 1768 } 1769 1770 void 1771 ipv6_ctxfree(struct dhcpcd_ctx *ctx) 1772 { 1773 1774 free(ctx->ra_routers); 1775 free(ctx->secret); 1776 } 1777 1778 int 1779 ipv6_handleifa_addrs(int cmd, 1780 struct ipv6_addrhead *addrs, const struct ipv6_addr *addr, pid_t pid) 1781 { 1782 struct ipv6_addr *ia, *ian; 1783 uint8_t found, alldadcompleted; 1784 1785 alldadcompleted = 1; 1786 found = 0; 1787 TAILQ_FOREACH_SAFE(ia, addrs, next, ian) { 1788 if (!IN6_ARE_ADDR_EQUAL(&addr->addr, &ia->addr)) { 1789 if (ia->flags & IPV6_AF_ADDED && 1790 !(ia->flags & IPV6_AF_DADCOMPLETED)) 1791 alldadcompleted = 0; 1792 continue; 1793 } 1794 switch (cmd) { 1795 case RTM_DELADDR: 1796 if (ia->flags & IPV6_AF_ADDED) { 1797 logwarnx("%s: pid %d deleted address %s", 1798 ia->iface->name, pid, ia->saddr); 1799 ia->flags &= ~IPV6_AF_ADDED; 1800 } 1801 if (ia->flags & IPV6_AF_DELEGATED) { 1802 TAILQ_REMOVE(addrs, ia, next); 1803 ipv6_deletedaddr(ia); 1804 ipv6_freeaddr(ia); 1805 } 1806 break; 1807 case RTM_NEWADDR: 1808 /* Safety - ignore tentative announcements */ 1809 if (addr->addr_flags & 1810 (IN6_IFF_DETACHED | IN6_IFF_TENTATIVE)) 1811 break; 1812 if ((ia->flags & IPV6_AF_DADCOMPLETED) == 0) { 1813 found++; 1814 if (addr->addr_flags & IN6_IFF_DUPLICATED) 1815 ia->flags |= IPV6_AF_DUPLICATED; 1816 else 1817 ia->flags &= ~IPV6_AF_DUPLICATED; 1818 if (ia->dadcallback) 1819 ia->dadcallback(ia); 1820 /* We need to set this here in-case the 1821 * dadcallback function checks it */ 1822 ia->flags |= IPV6_AF_DADCOMPLETED; 1823 } 1824 break; 1825 } 1826 } 1827 1828 return alldadcompleted ? found : 0; 1829 } 1830 1831 #ifdef IPV6_MANAGETEMPADDR 1832 static const struct ipv6_addr * 1833 ipv6_findaddrid(struct dhcpcd_ctx *ctx, uint8_t *addr) 1834 { 1835 const struct interface *ifp; 1836 const struct ipv6_state *state; 1837 const struct ipv6_addr *ia; 1838 1839 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 1840 if ((state = IPV6_CSTATE(ifp))) { 1841 TAILQ_FOREACH(ia, &state->addrs, next) { 1842 if (memcmp(&ia->addr.s6_addr[8], addr, 8) == 0) 1843 return ia; 1844 } 1845 } 1846 } 1847 return NULL; 1848 } 1849 1850 static const uint8_t nullid[8]; 1851 static const uint8_t anycastid[8] = { 1852 0xfd, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x80 }; 1853 static const uint8_t isatapid[4] = { 0x00, 0x00, 0x5e, 0xfe }; 1854 1855 static void 1856 ipv6_regen_desync(struct interface *ifp, int force) 1857 { 1858 struct ipv6_state *state; 1859 time_t max; 1860 1861 state = IPV6_STATE(ifp); 1862 1863 /* RFC4941 Section 5 states that DESYNC_FACTOR must never be 1864 * greater than TEMP_VALID_LIFETIME - REGEN_ADVANCE. 1865 * I believe this is an error and it should be never be greateter than 1866 * TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE. */ 1867 max = ip6_temp_preferred_lifetime(ifp->name) - REGEN_ADVANCE; 1868 if (state->desync_factor && !force && state->desync_factor < max) 1869 return; 1870 if (state->desync_factor == 0) 1871 state->desync_factor = 1872 (time_t)arc4random_uniform(MIN(MAX_DESYNC_FACTOR, 1873 (uint32_t)max)); 1874 max = ip6_temp_preferred_lifetime(ifp->name) - 1875 state->desync_factor - REGEN_ADVANCE; 1876 eloop_timeout_add_sec(ifp->ctx->eloop, max, ipv6_regentempifid, ifp); 1877 } 1878 1879 void 1880 ipv6_gentempifid(struct interface *ifp) 1881 { 1882 struct ipv6_state *state; 1883 MD5_CTX md5; 1884 uint8_t seed[16], digest[16]; 1885 int retry; 1886 1887 if ((state = IPV6_STATE(ifp)) == NULL) 1888 return; 1889 1890 retry = 0; 1891 if (memcmp(nullid, state->randomseed0, sizeof(nullid)) == 0) { 1892 uint32_t r; 1893 1894 r = arc4random(); 1895 memcpy(seed, &r, sizeof(r)); 1896 r = arc4random(); 1897 memcpy(seed + sizeof(r), &r, sizeof(r)); 1898 } else 1899 memcpy(seed, state->randomseed0, sizeof(state->randomseed0)); 1900 1901 memcpy(seed + sizeof(state->randomseed0), 1902 state->randomseed1, sizeof(state->randomseed1)); 1903 1904 again: 1905 MD5Init(&md5); 1906 MD5Update(&md5, seed, sizeof(seed)); 1907 MD5Final(digest, &md5); 1908 1909 /* RFC4941 Section 3.2.1.1 1910 * Take the left-most 64bits and set bit 6 to zero */ 1911 memcpy(state->randomid, digest, sizeof(state->randomid)); 1912 state->randomid[0] = (uint8_t)(state->randomid[0] & ~EUI64_UBIT); 1913 1914 /* RFC4941 Section 3.2.1.4 1915 * Reject reserved or existing id's */ 1916 if (memcmp(nullid, state->randomid, sizeof(nullid)) == 0 || 1917 (memcmp(anycastid, state->randomid, 7) == 0 && 1918 (anycastid[7] & state->randomid[7]) == anycastid[7]) || 1919 memcmp(isatapid, state->randomid, sizeof(isatapid)) == 0 || 1920 ipv6_findaddrid(ifp->ctx, state->randomid)) 1921 { 1922 if (++retry < GEN_TEMPID_RETRY_MAX) { 1923 memcpy(seed, digest + 8, 8); 1924 goto again; 1925 } 1926 memset(state->randomid, 0, sizeof(state->randomid)); 1927 } 1928 1929 /* RFC4941 Section 3.2.1.6 1930 * Save the right-most 64bits of the digest */ 1931 memcpy(state->randomseed0, digest + 8, 1932 sizeof(state->randomseed0)); 1933 } 1934 1935 /* RFC4941 Section 3.3.7 */ 1936 static void 1937 ipv6_tempdadcallback(void *arg) 1938 { 1939 struct ipv6_addr *ia = arg; 1940 1941 if (ia->flags & IPV6_AF_DUPLICATED) { 1942 struct ipv6_addr *ia1; 1943 struct timespec tv; 1944 1945 if (++ia->dadcounter == TEMP_IDGEN_RETRIES) { 1946 logerrx("%s: too many duplicate temporary addresses", 1947 ia->iface->name); 1948 return; 1949 } 1950 clock_gettime(CLOCK_MONOTONIC, &tv); 1951 if ((ia1 = ipv6_createtempaddr(ia, &tv)) == NULL) 1952 logerr(__func__); 1953 else 1954 ia1->dadcounter = ia->dadcounter; 1955 ipv6_deleteaddr(ia); 1956 if (ia1) 1957 ipv6_addaddr(ia1, &ia1->acquired); 1958 } 1959 } 1960 1961 struct ipv6_addr * 1962 ipv6_createtempaddr(struct ipv6_addr *ia0, const struct timespec *now) 1963 { 1964 struct ipv6_state *state; 1965 const struct ipv6_state *cstate; 1966 int genid; 1967 struct in6_addr addr, mask; 1968 uint32_t randid[2]; 1969 const struct interface *ifp; 1970 const struct ipv6_addr *ap; 1971 struct ipv6_addr *ia; 1972 uint32_t i, trylimit; 1973 1974 trylimit = TEMP_IDGEN_RETRIES; 1975 state = IPV6_STATE(ia0->iface); 1976 genid = 0; 1977 1978 addr = ia0->addr; 1979 ipv6_mask(&mask, ia0->prefix_len); 1980 /* clear the old ifid */ 1981 for (i = 0; i < 4; i++) 1982 addr.s6_addr32[i] &= mask.s6_addr32[i]; 1983 1984 again: 1985 if (memcmp(state->randomid, nullid, sizeof(nullid)) == 0) 1986 genid = 1; 1987 if (genid) { 1988 memcpy(state->randomseed1, &ia0->addr.s6_addr[8], 1989 sizeof(state->randomseed1)); 1990 ipv6_gentempifid(ia0->iface); 1991 if (memcmp(state->randomid, nullid, sizeof(nullid)) == 0) { 1992 errno = EFAULT; 1993 return NULL; 1994 } 1995 } 1996 memcpy(&randid[0], state->randomid, sizeof(randid[0])); 1997 memcpy(&randid[1], state->randomid + sizeof(randid[1]), 1998 sizeof(randid[2])); 1999 addr.s6_addr32[2] |= randid[0] & ~mask.s6_addr32[2]; 2000 addr.s6_addr32[3] |= randid[1] & ~mask.s6_addr32[3]; 2001 2002 /* Ensure we don't already have it */ 2003 TAILQ_FOREACH(ifp, ia0->iface->ctx->ifaces, next) { 2004 cstate = IPV6_CSTATE(ifp); 2005 if (cstate) { 2006 TAILQ_FOREACH(ap, &cstate->addrs, next) { 2007 if (IN6_ARE_ADDR_EQUAL(&ap->addr, &addr)) { 2008 if (--trylimit == 0) { 2009 errno = EEXIST; 2010 return NULL; 2011 } 2012 genid = 1; 2013 goto again; 2014 } 2015 } 2016 } 2017 } 2018 2019 ia = ipv6_newaddr(ia0->iface, &addr, ia0->prefix_len, 2020 IPV6_AF_AUTOCONF | IPV6_AF_TEMPORARY); 2021 /* Must be made tentative, for our DaD to work */ 2022 ia->addr_flags = IN6_IFF_TENTATIVE; 2023 ia->dadcallback = ipv6_tempdadcallback; 2024 ia->created = ia->acquired = now ? *now : ia0->acquired; 2025 2026 /* Ensure desync is still valid */ 2027 ipv6_regen_desync(ia->iface, 0); 2028 2029 /* RFC4941 Section 3.3.4 */ 2030 i = (uint32_t)(ip6_temp_preferred_lifetime(ia0->iface->name) - 2031 state->desync_factor); 2032 ia->prefix_pltime = MIN(ia0->prefix_pltime, i); 2033 i = (uint32_t)ip6_temp_valid_lifetime(ia0->iface->name); 2034 ia->prefix_vltime = MIN(ia0->prefix_vltime, i); 2035 if (ia->prefix_pltime <= REGEN_ADVANCE || 2036 ia->prefix_pltime > ia0->prefix_vltime) 2037 { 2038 errno = EINVAL; 2039 free(ia); 2040 return NULL; 2041 } 2042 2043 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 2044 return ia; 2045 } 2046 2047 struct ipv6_addr * 2048 ipv6_settemptime(struct ipv6_addr *ia, int flags) 2049 { 2050 struct ipv6_state *state; 2051 struct ipv6_addr *ap, *first; 2052 2053 state = IPV6_STATE(ia->iface); 2054 first = NULL; 2055 TAILQ_FOREACH_REVERSE(ap, &state->addrs, ipv6_addrhead, next) { 2056 if (ap->flags & IPV6_AF_TEMPORARY && 2057 ap->prefix_pltime && 2058 IN6_ARE_ADDR_EQUAL(&ia->prefix, &ap->prefix)) 2059 { 2060 time_t max, ext; 2061 2062 if (flags == 0) { 2063 if (ap->prefix_pltime - 2064 (uint32_t)(ia->acquired.tv_sec - 2065 ap->acquired.tv_sec) 2066 < REGEN_ADVANCE) 2067 continue; 2068 2069 return ap; 2070 } 2071 2072 if (!(ap->flags & IPV6_AF_ADDED)) 2073 ap->flags |= IPV6_AF_NEW | IPV6_AF_AUTOCONF; 2074 ap->flags &= ~IPV6_AF_STALE; 2075 2076 /* RFC4941 Section 3.4 2077 * Deprecated prefix, deprecate the temporary address */ 2078 if (ia->prefix_pltime == 0) { 2079 ap->prefix_pltime = 0; 2080 goto valid; 2081 } 2082 2083 /* Ensure desync is still valid */ 2084 ipv6_regen_desync(ap->iface, 0); 2085 2086 /* RFC4941 Section 3.3.2 2087 * Extend temporary times, but ensure that they 2088 * never last beyond the system limit. */ 2089 ext = ia->acquired.tv_sec + (time_t)ia->prefix_pltime; 2090 max = ap->created.tv_sec + 2091 ip6_temp_preferred_lifetime(ap->iface->name) - 2092 state->desync_factor; 2093 if (ext < max) 2094 ap->prefix_pltime = ia->prefix_pltime; 2095 else 2096 ap->prefix_pltime = 2097 (uint32_t)(max - ia->acquired.tv_sec); 2098 2099 valid: 2100 ext = ia->acquired.tv_sec + (time_t)ia->prefix_vltime; 2101 max = ap->created.tv_sec + 2102 ip6_temp_valid_lifetime(ap->iface->name); 2103 if (ext < max) 2104 ap->prefix_vltime = ia->prefix_vltime; 2105 else 2106 ap->prefix_vltime = 2107 (uint32_t)(max - ia->acquired.tv_sec); 2108 2109 /* Just extend the latest matching prefix */ 2110 ap->acquired = ia->acquired; 2111 2112 /* If extending return the last match as 2113 * it's the most current. 2114 * If deprecating, deprecate any other addresses we 2115 * may have, although this should not be needed */ 2116 if (ia->prefix_pltime) 2117 return ap; 2118 if (first == NULL) 2119 first = ap; 2120 } 2121 } 2122 return first; 2123 } 2124 2125 void 2126 ipv6_addtempaddrs(struct interface *ifp, const struct timespec *now) 2127 { 2128 struct ipv6_state *state; 2129 struct ipv6_addr *ia; 2130 2131 state = IPV6_STATE(ifp); 2132 TAILQ_FOREACH(ia, &state->addrs, next) { 2133 if (ia->flags & IPV6_AF_TEMPORARY && 2134 !(ia->flags & IPV6_AF_STALE)) 2135 ipv6_addaddr(ia, now); 2136 } 2137 } 2138 2139 static void 2140 ipv6_regentempaddr(void *arg) 2141 { 2142 struct ipv6_addr *ia = arg, *ia1; 2143 struct timespec tv; 2144 2145 logdebugx("%s: regen temp addr %s", ia->iface->name, ia->saddr); 2146 clock_gettime(CLOCK_MONOTONIC, &tv); 2147 ia1 = ipv6_createtempaddr(ia, &tv); 2148 if (ia1) 2149 ipv6_addaddr(ia1, &tv); 2150 else 2151 logerr(__func__); 2152 } 2153 2154 static void 2155 ipv6_regentempifid(void *arg) 2156 { 2157 struct interface *ifp = arg; 2158 struct ipv6_state *state; 2159 2160 state = IPV6_STATE(ifp); 2161 if (memcmp(state->randomid, nullid, sizeof(state->randomid))) 2162 ipv6_gentempifid(ifp); 2163 2164 ipv6_regen_desync(ifp, 1); 2165 } 2166 #endif /* IPV6_MANAGETEMPADDR */ 2167 2168 void 2169 ipv6_markaddrsstale(struct interface *ifp, unsigned int flags) 2170 { 2171 struct ipv6_state *state; 2172 struct ipv6_addr *ia; 2173 2174 state = IPV6_STATE(ifp); 2175 if (state == NULL) 2176 return; 2177 2178 TAILQ_FOREACH(ia, &state->addrs, next) { 2179 if (flags == 0 || ia->flags & flags) 2180 ia->flags |= IPV6_AF_STALE; 2181 } 2182 } 2183 2184 void 2185 ipv6_deletestaleaddrs(struct interface *ifp) 2186 { 2187 struct ipv6_state *state; 2188 struct ipv6_addr *ia, *ia1; 2189 2190 state = IPV6_STATE(ifp); 2191 if (state == NULL) 2192 return; 2193 2194 TAILQ_FOREACH_SAFE(ia, &state->addrs, next, ia1) { 2195 if (ia->flags & IPV6_AF_STALE) 2196 ipv6_handleifa(ifp->ctx, RTM_DELADDR, 2197 ifp->ctx->ifaces, ifp->name, 2198 &ia->addr, ia->prefix_len, 0, getpid()); 2199 } 2200 } 2201 2202 2203 static struct rt * 2204 inet6_makeroute(struct interface *ifp, const struct ra *rap) 2205 { 2206 struct rt *rt; 2207 2208 if ((rt = rt_new(ifp)) == NULL) 2209 return NULL; 2210 2211 #ifdef HAVE_ROUTE_METRIC 2212 rt->rt_metric = ifp->metric; 2213 #endif 2214 if (rap != NULL) 2215 rt->rt_mtu = rap->mtu; 2216 return rt; 2217 } 2218 2219 static struct rt * 2220 inet6_makeprefix(struct interface *ifp, const struct ra *rap, 2221 const struct ipv6_addr *addr) 2222 { 2223 struct rt *rt; 2224 struct in6_addr netmask; 2225 2226 if (addr == NULL || addr->prefix_len > 128) { 2227 errno = EINVAL; 2228 return NULL; 2229 } 2230 2231 /* There is no point in trying to manage a /128 prefix, 2232 * ones without a lifetime. */ 2233 if (addr->prefix_len == 128 || addr->prefix_vltime == 0) 2234 return NULL; 2235 2236 /* Don't install a reject route when not creating bigger prefixes. */ 2237 if (addr->flags & IPV6_AF_NOREJECT) 2238 return NULL; 2239 2240 /* This address is the delegated prefix, so add a reject route for 2241 * it via the loopback interface. */ 2242 if (addr->flags & IPV6_AF_DELEGATEDPFX) { 2243 struct interface *lo0; 2244 2245 TAILQ_FOREACH(lo0, ifp->ctx->ifaces, next) { 2246 if (lo0->flags & IFF_LOOPBACK) 2247 break; 2248 } 2249 if (lo0 == NULL) 2250 logwarnx("cannot find a loopback interface " 2251 "to reject via"); 2252 else 2253 ifp = lo0; 2254 } 2255 2256 if ((rt = inet6_makeroute(ifp, rap)) == NULL) 2257 return NULL; 2258 2259 sa_in6_init(&rt->rt_dest, &addr->prefix); 2260 ipv6_mask(&netmask, addr->prefix_len); 2261 sa_in6_init(&rt->rt_netmask, &netmask); 2262 if (addr->flags & IPV6_AF_DELEGATEDPFX) { 2263 rt->rt_flags |= RTF_REJECT; 2264 /* Linux does not like a gateway for a reject route. */ 2265 #ifndef __linux__ 2266 sa_in6_init(&rt->rt_gateway, &in6addr_loopback); 2267 #endif 2268 } else if (!(addr->flags & IPV6_AF_ONLINK)) 2269 sa_in6_init(&rt->rt_gateway, &rap->from); 2270 else 2271 rt->rt_gateway.sa_family = AF_UNSPEC; 2272 sa_in6_init(&rt->rt_ifa, &addr->addr); 2273 return rt; 2274 } 2275 2276 static struct rt * 2277 inet6_makerouter(struct ra *rap) 2278 { 2279 struct rt *rt; 2280 2281 if ((rt = inet6_makeroute(rap->iface, rap)) == NULL) 2282 return NULL; 2283 sa_in6_init(&rt->rt_dest, &in6addr_any); 2284 sa_in6_init(&rt->rt_netmask, &in6addr_any); 2285 sa_in6_init(&rt->rt_gateway, &rap->from); 2286 return rt; 2287 } 2288 2289 #define RT_IS_DEFAULT(rtp) \ 2290 (IN6_ARE_ADDR_EQUAL(&((rtp)->dest), &in6addr_any) && \ 2291 IN6_ARE_ADDR_EQUAL(&((rtp)->mask), &in6addr_any)) 2292 2293 static int 2294 inet6_staticroutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx) 2295 { 2296 struct interface *ifp; 2297 struct ipv6_state *state; 2298 struct ipv6_addr *ia; 2299 struct rt *rt; 2300 2301 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2302 if ((state = IPV6_STATE(ifp)) == NULL) 2303 continue; 2304 TAILQ_FOREACH(ia, &state->addrs, next) { 2305 if ((ia->flags & (IPV6_AF_ADDED | IPV6_AF_STATIC)) == 2306 (IPV6_AF_ADDED | IPV6_AF_STATIC)) 2307 { 2308 rt = inet6_makeprefix(ifp, NULL, ia); 2309 if (rt) 2310 rt_proto_add(routes, rt); 2311 } 2312 } 2313 } 2314 return 0; 2315 } 2316 2317 static int 2318 inet6_raroutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx) 2319 { 2320 struct rt *rt; 2321 struct ra *rap; 2322 const struct ipv6_addr *addr; 2323 2324 TAILQ_FOREACH(rap, ctx->ra_routers, next) { 2325 if (rap->expired) 2326 continue; 2327 TAILQ_FOREACH(addr, &rap->addrs, next) { 2328 if (addr->prefix_vltime == 0) 2329 continue; 2330 rt = inet6_makeprefix(rap->iface, rap, addr); 2331 if (rt) { 2332 rt->rt_dflags |= RTDF_RA; 2333 rt_proto_add(routes, rt); 2334 } 2335 } 2336 if (rap->lifetime == 0) 2337 continue; 2338 if (ipv6_ifanyglobal(rap->iface) == NULL) 2339 continue; 2340 rt = inet6_makerouter(rap); 2341 if (rt == NULL) 2342 continue; 2343 rt->rt_dflags |= RTDF_RA; 2344 rt_proto_add(routes, rt); 2345 } 2346 return 0; 2347 } 2348 2349 #ifdef DHCP6 2350 static int 2351 inet6_dhcproutes(rb_tree_t *routes, struct dhcpcd_ctx *ctx, 2352 enum DH6S dstate) 2353 { 2354 struct interface *ifp; 2355 const struct dhcp6_state *d6_state; 2356 const struct ipv6_addr *addr; 2357 struct rt *rt; 2358 2359 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2360 d6_state = D6_CSTATE(ifp); 2361 if (d6_state && d6_state->state == dstate) { 2362 TAILQ_FOREACH(addr, &d6_state->addrs, next) { 2363 rt = inet6_makeprefix(ifp, NULL, addr); 2364 if (rt == NULL) 2365 continue; 2366 rt->rt_dflags |= RTDF_DHCP; 2367 rt_proto_add(routes, rt); 2368 } 2369 } 2370 } 2371 return 0; 2372 } 2373 #endif 2374 2375 bool 2376 inet6_getroutes(struct dhcpcd_ctx *ctx, rb_tree_t *routes) 2377 { 2378 2379 /* Should static take priority? */ 2380 if (inet6_staticroutes(routes, ctx) == -1) 2381 return false; 2382 2383 /* First add reachable routers and their prefixes */ 2384 if (inet6_raroutes(routes, ctx) == -1) 2385 return false; 2386 2387 #ifdef DHCP6 2388 /* We have no way of knowing if prefixes added by DHCP are reachable 2389 * or not, so we have to assume they are. 2390 * Add bound before delegated so we can prefer interfaces better. */ 2391 if (inet6_dhcproutes(routes, ctx, DH6S_BOUND) == -1) 2392 return false; 2393 if (inet6_dhcproutes(routes, ctx, DH6S_DELEGATED) == -1) 2394 return false; 2395 #endif 2396 2397 return true; 2398 } 2399