1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2020 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/utsname.h> 30 #include <sys/types.h> 31 32 #include <netinet/in.h> 33 #include <netinet/ip6.h> 34 35 #include <assert.h> 36 #include <ctype.h> 37 #include <errno.h> 38 #include <fcntl.h> 39 #include <inttypes.h> 40 #include <stdbool.h> 41 #include <stddef.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <unistd.h> 45 #include <fcntl.h> 46 #include <syslog.h> 47 48 #define ELOOP_QUEUE ELOOP_DHCP6 49 #include "config.h" 50 #include "common.h" 51 #include "dhcp.h" 52 #include "dhcp6.h" 53 #include "duid.h" 54 #include "eloop.h" 55 #include "if.h" 56 #include "if-options.h" 57 #include "ipv6nd.h" 58 #include "logerr.h" 59 #include "privsep.h" 60 #include "script.h" 61 62 #ifdef HAVE_SYS_BITOPS_H 63 #include <sys/bitops.h> 64 #else 65 #include "compat/bitops.h" 66 #endif 67 68 /* DHCPCD Project has been assigned an IANA PEN of 40712 */ 69 #define DHCPCD_IANA_PEN 40712 70 71 /* Unsure if I want this */ 72 //#define VENDOR_SPLIT 73 74 /* Support older systems with different defines */ 75 #if !defined(IPV6_RECVPKTINFO) && defined(IPV6_PKTINFO) 76 #define IPV6_RECVPKTINFO IPV6_PKTINFO 77 #endif 78 79 #ifdef DHCP6 80 81 /* Assert the correct structure size for on wire */ 82 struct dhcp6_message { 83 uint8_t type; 84 uint8_t xid[3]; 85 /* followed by options */ 86 }; 87 __CTASSERT(sizeof(struct dhcp6_message) == 4); 88 89 struct dhcp6_option { 90 uint16_t code; 91 uint16_t len; 92 /* followed by data */ 93 }; 94 __CTASSERT(sizeof(struct dhcp6_option) == 4); 95 96 struct dhcp6_ia_na { 97 uint8_t iaid[4]; 98 uint32_t t1; 99 uint32_t t2; 100 }; 101 __CTASSERT(sizeof(struct dhcp6_ia_na) == 12); 102 103 struct dhcp6_ia_ta { 104 uint8_t iaid[4]; 105 }; 106 __CTASSERT(sizeof(struct dhcp6_ia_ta) == 4); 107 108 struct dhcp6_ia_addr { 109 struct in6_addr addr; 110 uint32_t pltime; 111 uint32_t vltime; 112 }; 113 __CTASSERT(sizeof(struct dhcp6_ia_addr) == 16 + 8); 114 115 /* XXX FIXME: This is the only packed structure and it does not align. 116 * Maybe manually decode it? */ 117 struct dhcp6_pd_addr { 118 uint32_t pltime; 119 uint32_t vltime; 120 uint8_t prefix_len; 121 struct in6_addr prefix; 122 } __packed; 123 __CTASSERT(sizeof(struct dhcp6_pd_addr) == 8 + 1 + 16); 124 125 struct dhcp6_op { 126 uint16_t type; 127 const char *name; 128 }; 129 130 static const struct dhcp6_op dhcp6_ops[] = { 131 { DHCP6_SOLICIT, "SOLICIT6" }, 132 { DHCP6_ADVERTISE, "ADVERTISE6" }, 133 { DHCP6_REQUEST, "REQUEST6" }, 134 { DHCP6_REPLY, "REPLY6" }, 135 { DHCP6_RENEW, "RENEW6" }, 136 { DHCP6_REBIND, "REBIND6" }, 137 { DHCP6_CONFIRM, "CONFIRM6" }, 138 { DHCP6_INFORMATION_REQ, "INFORM6" }, 139 { DHCP6_RELEASE, "RELEASE6" }, 140 { DHCP6_RECONFIGURE, "RECONFIGURE6" }, 141 { DHCP6_DECLINE, "DECLINE6" }, 142 { 0, NULL } 143 }; 144 145 struct dhcp_compat { 146 uint8_t dhcp_opt; 147 uint16_t dhcp6_opt; 148 }; 149 150 static const struct dhcp_compat dhcp_compats[] = { 151 { DHO_DNSSERVER, D6_OPTION_DNS_SERVERS }, 152 { DHO_HOSTNAME, D6_OPTION_FQDN }, 153 { DHO_DNSDOMAIN, D6_OPTION_FQDN }, 154 { DHO_NISSERVER, D6_OPTION_NIS_SERVERS }, 155 { DHO_NTPSERVER, D6_OPTION_SNTP_SERVERS }, 156 { DHO_RAPIDCOMMIT, D6_OPTION_RAPID_COMMIT }, 157 { DHO_FQDN, D6_OPTION_FQDN }, 158 { DHO_VIVCO, D6_OPTION_VENDOR_CLASS }, 159 { DHO_VIVSO, D6_OPTION_VENDOR_OPTS }, 160 { DHO_DNSSEARCH, D6_OPTION_DOMAIN_LIST }, 161 { 0, 0 } 162 }; 163 164 static const char * const dhcp6_statuses[] = { 165 "Success", 166 "Unspecified Failure", 167 "No Addresses Available", 168 "No Binding", 169 "Not On Link", 170 "Use Multicast", 171 "No Prefix Available" 172 }; 173 174 static void dhcp6_bind(struct interface *, const char *, const char *); 175 static void dhcp6_failinform(void *); 176 static void dhcp6_recvaddr(void *); 177 static void dhcp6_startdecline(struct interface *); 178 179 #ifdef SMALL 180 #define dhcp6_hasprefixdelegation(a) (0) 181 #else 182 static int dhcp6_hasprefixdelegation(struct interface *); 183 #endif 184 185 #define DECLINE_IA(ia) \ 186 ((ia)->addr_flags & IN6_IFF_DUPLICATED && \ 187 (ia)->ia_type != 0 && (ia)->ia_type != D6_OPTION_IA_PD && \ 188 !((ia)->flags & IPV6_AF_STALE) && \ 189 (ia)->prefix_vltime != 0) 190 191 void 192 dhcp6_printoptions(const struct dhcpcd_ctx *ctx, 193 const struct dhcp_opt *opts, size_t opts_len) 194 { 195 size_t i, j; 196 const struct dhcp_opt *opt, *opt2; 197 int cols; 198 199 for (i = 0, opt = ctx->dhcp6_opts; 200 i < ctx->dhcp6_opts_len; i++, opt++) 201 { 202 for (j = 0, opt2 = opts; j < opts_len; j++, opt2++) 203 if (opt2->option == opt->option) 204 break; 205 if (j == opts_len) { 206 cols = printf("%05d %s", opt->option, opt->var); 207 dhcp_print_option_encoding(opt, cols); 208 } 209 } 210 for (i = 0, opt = opts; i < opts_len; i++, opt++) { 211 cols = printf("%05d %s", opt->option, opt->var); 212 dhcp_print_option_encoding(opt, cols); 213 } 214 } 215 216 static size_t 217 dhcp6_makeuser(void *data, const struct interface *ifp) 218 { 219 const struct if_options *ifo = ifp->options; 220 struct dhcp6_option o; 221 uint8_t *p; 222 const uint8_t *up, *ue; 223 uint16_t ulen, unlen; 224 size_t olen; 225 226 /* Convert the DHCPv4 user class option to DHCPv6 */ 227 up = ifo->userclass; 228 ulen = *up++; 229 if (ulen == 0) 230 return 0; 231 232 p = data; 233 olen = 0; 234 if (p != NULL) 235 p += sizeof(o); 236 237 ue = up + ulen; 238 for (; up < ue; up += ulen) { 239 ulen = *up++; 240 olen += sizeof(ulen) + ulen; 241 if (data == NULL) 242 continue; 243 unlen = htons(ulen); 244 memcpy(p, &unlen, sizeof(unlen)); 245 p += sizeof(unlen); 246 memcpy(p, up, ulen); 247 p += ulen; 248 } 249 if (data != NULL) { 250 o.code = htons(D6_OPTION_USER_CLASS); 251 o.len = htons((uint16_t)olen); 252 memcpy(data, &o, sizeof(o)); 253 } 254 255 return sizeof(o) + olen; 256 } 257 258 static size_t 259 dhcp6_makevendor(void *data, const struct interface *ifp) 260 { 261 const struct if_options *ifo; 262 size_t len, vlen, i; 263 uint8_t *p; 264 const struct vivco *vivco; 265 struct dhcp6_option o; 266 267 ifo = ifp->options; 268 len = sizeof(uint32_t); /* IANA PEN */ 269 if (ifo->vivco_en) { 270 vlen = 0; 271 for (i = 0, vivco = ifo->vivco; 272 i < ifo->vivco_len; 273 i++, vivco++) 274 vlen += sizeof(uint16_t) + vivco->len; 275 len += vlen; 276 } else if (ifo->vendorclassid[0] != '\0') { 277 /* dhcpcd owns DHCPCD_IANA_PEN. 278 * If you need your own string, get your own IANA PEN. */ 279 vlen = strlen(ifp->ctx->vendor); 280 len += sizeof(uint16_t) + vlen; 281 } else 282 return 0; 283 284 if (len > UINT16_MAX) { 285 logerrx("%s: DHCPv6 Vendor Class too big", ifp->name); 286 return 0; 287 } 288 289 if (data != NULL) { 290 uint32_t pen; 291 uint16_t hvlen; 292 293 p = data; 294 o.code = htons(D6_OPTION_VENDOR_CLASS); 295 o.len = htons((uint16_t)len); 296 memcpy(p, &o, sizeof(o)); 297 p += sizeof(o); 298 pen = htonl(ifo->vivco_en ? ifo->vivco_en : DHCPCD_IANA_PEN); 299 memcpy(p, &pen, sizeof(pen)); 300 p += sizeof(pen); 301 302 if (ifo->vivco_en) { 303 for (i = 0, vivco = ifo->vivco; 304 i < ifo->vivco_len; 305 i++, vivco++) 306 { 307 hvlen = htons((uint16_t)vivco->len); 308 memcpy(p, &hvlen, sizeof(hvlen)); 309 p += sizeof(hvlen); 310 memcpy(p, vivco->data, vivco->len); 311 p += vivco->len; 312 } 313 } else if (ifo->vendorclassid[0] != '\0') { 314 hvlen = htons((uint16_t)vlen); 315 memcpy(p, &hvlen, sizeof(hvlen)); 316 p += sizeof(hvlen); 317 memcpy(p, ifp->ctx->vendor, vlen); 318 } 319 } 320 321 return sizeof(o) + len; 322 } 323 324 static void * 325 dhcp6_findoption(void *data, size_t data_len, uint16_t code, uint16_t *len) 326 { 327 uint8_t *d; 328 struct dhcp6_option o; 329 330 code = htons(code); 331 for (d = data; data_len != 0; d += o.len, data_len -= o.len) { 332 if (data_len < sizeof(o)) { 333 errno = EINVAL; 334 return NULL; 335 } 336 memcpy(&o, d, sizeof(o)); 337 d += sizeof(o); 338 data_len -= sizeof(o); 339 o.len = htons(o.len); 340 if (data_len < o.len) { 341 errno = EINVAL; 342 return NULL; 343 } 344 if (o.code == code) { 345 if (len != NULL) 346 *len = o.len; 347 return d; 348 } 349 } 350 351 errno = ENOENT; 352 return NULL; 353 } 354 355 static void * 356 dhcp6_findmoption(void *data, size_t data_len, uint16_t code, 357 uint16_t *len) 358 { 359 uint8_t *d; 360 361 if (data_len < sizeof(struct dhcp6_message)) { 362 errno = EINVAL; 363 return false; 364 } 365 d = data; 366 d += sizeof(struct dhcp6_message); 367 data_len -= sizeof(struct dhcp6_message); 368 return dhcp6_findoption(d, data_len, code, len); 369 } 370 371 static const uint8_t * 372 dhcp6_getoption(struct dhcpcd_ctx *ctx, 373 size_t *os, unsigned int *code, size_t *len, 374 const uint8_t *od, size_t ol, struct dhcp_opt **oopt) 375 { 376 struct dhcp6_option o; 377 size_t i; 378 struct dhcp_opt *opt; 379 380 if (od != NULL) { 381 *os = sizeof(o); 382 if (ol < *os) { 383 errno = EINVAL; 384 return NULL; 385 } 386 memcpy(&o, od, sizeof(o)); 387 *len = ntohs(o.len); 388 if (*len > ol - *os) { 389 errno = ERANGE; 390 return NULL; 391 } 392 *code = ntohs(o.code); 393 } 394 395 *oopt = NULL; 396 for (i = 0, opt = ctx->dhcp6_opts; 397 i < ctx->dhcp6_opts_len; i++, opt++) 398 { 399 if (opt->option == *code) { 400 *oopt = opt; 401 break; 402 } 403 } 404 405 if (od != NULL) 406 return od + sizeof(o); 407 return NULL; 408 } 409 410 static bool 411 dhcp6_updateelapsed(struct interface *ifp, struct dhcp6_message *m, size_t len) 412 { 413 uint8_t *opt; 414 uint16_t opt_len; 415 struct dhcp6_state *state; 416 struct timespec tv; 417 unsigned long long hsec; 418 uint16_t sec; 419 420 opt = dhcp6_findmoption(m, len, D6_OPTION_ELAPSED, &opt_len); 421 if (opt == NULL) 422 return false; 423 if (opt_len != sizeof(sec)) { 424 errno = EINVAL; 425 return false; 426 } 427 428 state = D6_STATE(ifp); 429 clock_gettime(CLOCK_MONOTONIC, &tv); 430 if (state->RTC == 0) { 431 /* An RTC of zero means we're the first message 432 * out of the door, so the elapsed time is zero. */ 433 state->started = tv; 434 hsec = 0; 435 } else { 436 unsigned long long secs; 437 unsigned int nsecs; 438 439 secs = eloop_timespec_diff(&tv, &state->started, &nsecs); 440 /* Elapsed time is measured in centiseconds. 441 * We need to be sure it will not potentially overflow. */ 442 if (secs >= (UINT16_MAX / CSEC_PER_SEC) + 1) 443 hsec = UINT16_MAX; 444 else { 445 hsec = (secs * CSEC_PER_SEC) + 446 (nsecs / NSEC_PER_CSEC); 447 if (hsec > UINT16_MAX) 448 hsec = UINT16_MAX; 449 } 450 } 451 sec = htons((uint16_t)hsec); 452 memcpy(opt, &sec, sizeof(sec)); 453 return true; 454 } 455 456 static void 457 dhcp6_newxid(const struct interface *ifp, struct dhcp6_message *m) 458 { 459 const struct interface *ifp1; 460 const struct dhcp6_state *state1; 461 uint32_t xid; 462 463 if (ifp->options->options & DHCPCD_XID_HWADDR && 464 ifp->hwlen >= sizeof(xid)) 465 /* The lower bits are probably more unique on the network */ 466 memcpy(&xid, (ifp->hwaddr + ifp->hwlen) - sizeof(xid), 467 sizeof(xid)); 468 else { 469 again: 470 xid = arc4random(); 471 } 472 473 m->xid[0] = (xid >> 16) & 0xff; 474 m->xid[1] = (xid >> 8) & 0xff; 475 m->xid[2] = xid & 0xff; 476 477 /* Ensure it's unique */ 478 TAILQ_FOREACH(ifp1, ifp->ctx->ifaces, next) { 479 if (ifp == ifp1) 480 continue; 481 if ((state1 = D6_CSTATE(ifp1)) == NULL) 482 continue; 483 if (state1->send != NULL && 484 state1->send->xid[0] == m->xid[0] && 485 state1->send->xid[1] == m->xid[1] && 486 state1->send->xid[2] == m->xid[2]) 487 break; 488 } 489 490 if (ifp1 != NULL) { 491 if (ifp->options->options & DHCPCD_XID_HWADDR && 492 ifp->hwlen >= sizeof(xid)) 493 { 494 logerrx("%s: duplicate xid on %s", 495 ifp->name, ifp1->name); 496 return; 497 } 498 goto again; 499 } 500 } 501 502 #ifndef SMALL 503 static const struct if_sla * 504 dhcp6_findselfsla(struct interface *ifp) 505 { 506 size_t i, j; 507 struct if_ia *ia; 508 509 for (i = 0; i < ifp->options->ia_len; i++) { 510 ia = &ifp->options->ia[i]; 511 if (ia->ia_type != D6_OPTION_IA_PD) 512 continue; 513 for (j = 0; j < ia->sla_len; j++) { 514 if (strcmp(ia->sla[j].ifname, ifp->name) == 0) 515 return &ia->sla[j]; 516 } 517 } 518 return NULL; 519 } 520 521 static int 522 dhcp6_delegateaddr(struct in6_addr *addr, struct interface *ifp, 523 const struct ipv6_addr *prefix, const struct if_sla *sla, struct if_ia *ia) 524 { 525 struct dhcp6_state *state; 526 struct if_sla asla; 527 char sabuf[INET6_ADDRSTRLEN]; 528 const char *sa; 529 530 state = D6_STATE(ifp); 531 if (state == NULL) { 532 ifp->if_data[IF_DATA_DHCP6] = calloc(1, sizeof(*state)); 533 state = D6_STATE(ifp); 534 if (state == NULL) { 535 logerr(__func__); 536 return -1; 537 } 538 539 TAILQ_INIT(&state->addrs); 540 state->state = DH6S_DELEGATED; 541 state->reason = "DELEGATED6"; 542 } 543 544 if (sla == NULL || !sla->sla_set) { 545 /* No SLA set, so make an assumption of 546 * desired SLA and prefix length. */ 547 asla.sla = ifp->index; 548 asla.prefix_len = 0; 549 asla.sla_set = false; 550 sla = &asla; 551 } else if (sla->prefix_len == 0) { 552 /* An SLA was given, but prefix length was not. 553 * We need to work out a suitable prefix length for 554 * potentially more than one interface. */ 555 asla.sla = sla->sla; 556 asla.prefix_len = 0; 557 asla.sla_set = sla->sla_set; 558 sla = &asla; 559 } 560 561 if (sla->prefix_len == 0) { 562 uint32_t sla_max; 563 int bits; 564 565 sla_max = ia->sla_max; 566 if (sla_max == 0 && (sla == NULL || !sla->sla_set)) { 567 const struct interface *ifi; 568 569 TAILQ_FOREACH(ifi, ifp->ctx->ifaces, next) { 570 if (ifi->index > sla_max) 571 sla_max = ifi->index; 572 } 573 } 574 575 bits = fls32(sla_max); 576 577 if (prefix->prefix_len + bits > (int)UINT8_MAX) 578 asla.prefix_len = UINT8_MAX; 579 else { 580 asla.prefix_len = (uint8_t)(prefix->prefix_len + bits); 581 582 /* Make a 64 prefix by default, as this makes SLAAC 583 * possible. 584 * Otherwise round up to the nearest 4 bits. */ 585 if (asla.prefix_len <= 64) 586 asla.prefix_len = 64; 587 else 588 asla.prefix_len = 589 (uint8_t)ROUNDUP4(asla.prefix_len); 590 } 591 592 #define BIT(n) (1UL << (n)) 593 #define BIT_MASK(len) (BIT(len) - 1) 594 if (ia->sla_max == 0) { 595 /* Work out the real sla_max from our bits used */ 596 bits = asla.prefix_len - prefix->prefix_len; 597 /* Make static analysis happy. 598 * Bits cannot be bigger than 32 thanks to fls32. */ 599 assert(bits <= 32); 600 ia->sla_max = (uint32_t)BIT_MASK(bits); 601 } 602 } 603 604 if (ipv6_userprefix(&prefix->prefix, prefix->prefix_len, 605 sla->sla, addr, sla->prefix_len) == -1) 606 { 607 sa = inet_ntop(AF_INET6, &prefix->prefix, 608 sabuf, sizeof(sabuf)); 609 logerr("%s: invalid prefix %s/%d + %d/%d", 610 ifp->name, sa, prefix->prefix_len, 611 sla->sla, sla->prefix_len); 612 return -1; 613 } 614 615 if (prefix->prefix_exclude_len && 616 IN6_ARE_ADDR_EQUAL(addr, &prefix->prefix_exclude)) 617 { 618 sa = inet_ntop(AF_INET6, &prefix->prefix_exclude, 619 sabuf, sizeof(sabuf)); 620 logerrx("%s: cannot delegate excluded prefix %s/%d", 621 ifp->name, sa, prefix->prefix_exclude_len); 622 return -1; 623 } 624 625 return sla->prefix_len; 626 } 627 #endif 628 629 static int 630 dhcp6_makemessage(struct interface *ifp) 631 { 632 struct dhcp6_state *state; 633 struct dhcp6_message *m; 634 struct dhcp6_option o; 635 uint8_t *p, *si, *unicast, IA; 636 size_t n, l, len, ml, hl; 637 uint8_t type; 638 uint16_t si_len, uni_len, n_options; 639 uint8_t *o_lenp; 640 struct if_options *ifo; 641 const struct dhcp_opt *opt, *opt2; 642 const struct ipv6_addr *ap; 643 char hbuf[HOSTNAME_MAX_LEN + 1]; 644 const char *hostname; 645 int fqdn; 646 struct dhcp6_ia_na ia_na; 647 uint16_t ia_na_len; 648 struct if_ia *ifia; 649 #ifdef AUTH 650 uint16_t auth_len; 651 #endif 652 uint8_t duid[DUID_LEN]; 653 size_t duid_len = 0; 654 655 state = D6_STATE(ifp); 656 if (state->send) { 657 free(state->send); 658 state->send = NULL; 659 } 660 661 ifo = ifp->options; 662 fqdn = ifo->fqdn; 663 664 if (fqdn == FQDN_DISABLE && ifo->options & DHCPCD_HOSTNAME) { 665 /* We're sending the DHCPv4 hostname option, so send FQDN as 666 * DHCPv6 has no FQDN option and DHCPv4 must not send 667 * hostname and FQDN according to RFC4702 */ 668 fqdn = FQDN_BOTH; 669 } 670 if (fqdn != FQDN_DISABLE) 671 hostname = dhcp_get_hostname(hbuf, sizeof(hbuf), ifo); 672 else 673 hostname = NULL; /* appearse gcc */ 674 675 /* Work out option size first */ 676 n_options = 0; 677 len = 0; 678 si = NULL; 679 hl = 0; /* Appease gcc */ 680 if (state->state != DH6S_RELEASE && state->state != DH6S_DECLINE) { 681 for (l = 0, opt = ifp->ctx->dhcp6_opts; 682 l < ifp->ctx->dhcp6_opts_len; 683 l++, opt++) 684 { 685 for (n = 0, opt2 = ifo->dhcp6_override; 686 n < ifo->dhcp6_override_len; 687 n++, opt2++) 688 { 689 if (opt->option == opt2->option) 690 break; 691 } 692 if (n < ifo->dhcp6_override_len) 693 continue; 694 if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6)) 695 continue; 696 n_options++; 697 len += sizeof(o.len); 698 } 699 #ifndef SMALL 700 for (l = 0, opt = ifo->dhcp6_override; 701 l < ifo->dhcp6_override_len; 702 l++, opt++) 703 { 704 if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6)) 705 continue; 706 n_options++; 707 len += sizeof(o.len); 708 } 709 if (dhcp6_findselfsla(ifp)) { 710 n_options++; 711 len += sizeof(o.len); 712 } 713 #endif 714 if (len) 715 len += sizeof(o); 716 717 if (fqdn != FQDN_DISABLE) { 718 hl = encode_rfc1035(hostname, NULL); 719 len += sizeof(o) + 1 + hl; 720 } 721 722 if (!has_option_mask(ifo->nomask6, D6_OPTION_MUDURL) && 723 ifo->mudurl[0]) 724 len += sizeof(o) + ifo->mudurl[0]; 725 726 #ifdef AUTH 727 if ((ifo->auth.options & DHCPCD_AUTH_SENDREQUIRE) != 728 DHCPCD_AUTH_SENDREQUIRE && 729 DHC_REQ(ifo->requestmask6, ifo->nomask6, 730 D6_OPTION_RECONF_ACCEPT)) 731 len += sizeof(o); /* Reconfigure Accept */ 732 #endif 733 } 734 735 len += sizeof(*state->send); 736 len += sizeof(o) + sizeof(uint16_t); /* elapsed */ 737 738 if (ifo->options & DHCPCD_ANONYMOUS) { 739 duid_len = duid_make(duid, ifp, DUID_LL); 740 len += sizeof(o) + duid_len; 741 } else { 742 len += sizeof(o) + ifp->ctx->duid_len; 743 } 744 745 if (!has_option_mask(ifo->nomask6, D6_OPTION_USER_CLASS)) 746 len += dhcp6_makeuser(NULL, ifp); 747 if (!has_option_mask(ifo->nomask6, D6_OPTION_VENDOR_CLASS)) 748 len += dhcp6_makevendor(NULL, ifp); 749 750 /* IA */ 751 m = NULL; 752 ml = 0; 753 switch(state->state) { 754 case DH6S_REQUEST: 755 m = state->recv; 756 ml = state->recv_len; 757 /* FALLTHROUGH */ 758 case DH6S_DECLINE: 759 /* FALLTHROUGH */ 760 case DH6S_RELEASE: 761 /* FALLTHROUGH */ 762 case DH6S_RENEW: 763 if (m == NULL) { 764 m = state->new; 765 ml = state->new_len; 766 } 767 si = dhcp6_findmoption(m, ml, D6_OPTION_SERVERID, &si_len); 768 if (si == NULL) 769 return -1; 770 len += sizeof(o) + si_len; 771 /* FALLTHROUGH */ 772 case DH6S_REBIND: 773 /* FALLTHROUGH */ 774 case DH6S_CONFIRM: 775 /* FALLTHROUGH */ 776 case DH6S_DISCOVER: 777 if (m == NULL) { 778 m = state->new; 779 ml = state->new_len; 780 } 781 TAILQ_FOREACH(ap, &state->addrs, next) { 782 if (ap->flags & IPV6_AF_STALE) 783 continue; 784 if (!(ap->flags & IPV6_AF_REQUEST) && 785 (ap->prefix_vltime == 0 || 786 state->state == DH6S_DISCOVER)) 787 continue; 788 if (DECLINE_IA(ap) && state->state != DH6S_DECLINE) 789 continue; 790 if (ap->ia_type == D6_OPTION_IA_PD) { 791 #ifndef SMALL 792 len += sizeof(o) + sizeof(struct dhcp6_pd_addr); 793 if (ap->prefix_exclude_len) 794 len += sizeof(o) + 1 + 795 (uint8_t)((ap->prefix_exclude_len - 796 ap->prefix_len - 1) / NBBY) + 1; 797 #endif 798 } else 799 len += sizeof(o) + sizeof(struct dhcp6_ia_addr); 800 } 801 /* FALLTHROUGH */ 802 case DH6S_INIT: 803 for (l = 0; l < ifo->ia_len; l++) { 804 len += sizeof(o) + sizeof(uint32_t); /* IAID */ 805 /* IA_TA does not have T1 or T2 timers */ 806 if (ifo->ia[l].ia_type != D6_OPTION_IA_TA) 807 len += sizeof(uint32_t) + sizeof(uint32_t); 808 } 809 IA = 1; 810 break; 811 default: 812 IA = 0; 813 } 814 815 if (state->state == DH6S_DISCOVER && 816 !(ifp->ctx->options & DHCPCD_TEST) && 817 DHC_REQ(ifo->requestmask6, ifo->nomask6, D6_OPTION_RAPID_COMMIT)) 818 len += sizeof(o); 819 820 if (m == NULL) { 821 m = state->new; 822 ml = state->new_len; 823 } 824 825 switch(state->state) { 826 case DH6S_INIT: /* FALLTHROUGH */ 827 case DH6S_DISCOVER: 828 type = DHCP6_SOLICIT; 829 break; 830 case DH6S_REQUEST: 831 type = DHCP6_REQUEST; 832 break; 833 case DH6S_CONFIRM: 834 type = DHCP6_CONFIRM; 835 break; 836 case DH6S_REBIND: 837 type = DHCP6_REBIND; 838 break; 839 case DH6S_RENEW: 840 type = DHCP6_RENEW; 841 break; 842 case DH6S_INFORM: 843 type = DHCP6_INFORMATION_REQ; 844 break; 845 case DH6S_RELEASE: 846 type = DHCP6_RELEASE; 847 break; 848 case DH6S_DECLINE: 849 type = DHCP6_DECLINE; 850 break; 851 default: 852 errno = EINVAL; 853 return -1; 854 } 855 856 switch(state->state) { 857 case DH6S_REQUEST: /* FALLTHROUGH */ 858 case DH6S_RENEW: /* FALLTHROUGH */ 859 case DH6S_RELEASE: 860 if (has_option_mask(ifo->nomask6, D6_OPTION_UNICAST)) { 861 unicast = NULL; 862 break; 863 } 864 unicast = dhcp6_findmoption(m, ml, D6_OPTION_UNICAST, &uni_len); 865 break; 866 default: 867 unicast = NULL; 868 break; 869 } 870 871 /* In non master mode we listen and send from fixed addresses. 872 * We should try and match an address we have to unicast to, 873 * but for now this is the safest policy. */ 874 if (unicast != NULL && !(ifp->ctx->options & DHCPCD_MASTER)) { 875 logdebugx("%s: ignoring unicast option as not master", 876 ifp->name); 877 unicast = NULL; 878 } 879 880 #ifdef AUTH 881 auth_len = 0; 882 if (ifo->auth.options & DHCPCD_AUTH_SEND) { 883 ssize_t alen = dhcp_auth_encode(ifp->ctx, &ifo->auth, 884 state->auth.token, NULL, 0, 6, type, NULL, 0); 885 if (alen != -1 && alen > UINT16_MAX) { 886 errno = ERANGE; 887 alen = -1; 888 } 889 if (alen == -1) 890 logerr("%s: %s: dhcp_auth_encode", __func__, ifp->name); 891 else if (alen != 0) { 892 auth_len = (uint16_t)alen; 893 len += sizeof(o) + auth_len; 894 } 895 } 896 #endif 897 898 state->send = malloc(len); 899 if (state->send == NULL) 900 return -1; 901 902 state->send_len = len; 903 state->send->type = type; 904 905 /* If we found a unicast option, copy it to our state for sending */ 906 if (unicast && uni_len == sizeof(state->unicast)) 907 memcpy(&state->unicast, unicast, sizeof(state->unicast)); 908 else 909 state->unicast = in6addr_any; 910 911 dhcp6_newxid(ifp, state->send); 912 913 #define COPYIN1(_code, _len) { \ 914 o.code = htons((_code)); \ 915 o.len = htons((_len)); \ 916 memcpy(p, &o, sizeof(o)); \ 917 p += sizeof(o); \ 918 } 919 #define COPYIN(_code, _data, _len) do { \ 920 COPYIN1((_code), (_len)); \ 921 if ((_len) != 0) { \ 922 memcpy(p, (_data), (_len)); \ 923 p += (_len); \ 924 } \ 925 } while (0 /* CONSTCOND */) 926 #define NEXTLEN (p + offsetof(struct dhcp6_option, len)) 927 928 /* Options are listed in numerical order as per RFC 7844 Section 4.1 929 * XXX: They should be randomised. */ 930 931 p = (uint8_t *)state->send + sizeof(*state->send); 932 if (ifo->options & DHCPCD_ANONYMOUS) 933 COPYIN(D6_OPTION_CLIENTID, duid, 934 (uint16_t)duid_len); 935 else 936 COPYIN(D6_OPTION_CLIENTID, ifp->ctx->duid, 937 (uint16_t)ifp->ctx->duid_len); 938 939 if (si != NULL) 940 COPYIN(D6_OPTION_SERVERID, si, si_len); 941 942 for (l = 0; IA && l < ifo->ia_len; l++) { 943 ifia = &ifo->ia[l]; 944 o_lenp = NEXTLEN; 945 /* TA structure is the same as the others, 946 * it just lacks the T1 and T2 timers. 947 * These happen to be at the end of the struct, 948 * so we just don't copy them in. */ 949 if (ifia->ia_type == D6_OPTION_IA_TA) 950 ia_na_len = sizeof(struct dhcp6_ia_ta); 951 else 952 ia_na_len = sizeof(ia_na); 953 memcpy(ia_na.iaid, ifia->iaid, sizeof(ia_na.iaid)); 954 ia_na.t1 = 0; 955 ia_na.t2 = 0; 956 COPYIN(ifia->ia_type, &ia_na, ia_na_len); 957 TAILQ_FOREACH(ap, &state->addrs, next) { 958 if (ap->flags & IPV6_AF_STALE) 959 continue; 960 if (!(ap->flags & IPV6_AF_REQUEST) && 961 (ap->prefix_vltime == 0 || 962 state->state == DH6S_DISCOVER)) 963 continue; 964 if (DECLINE_IA(ap) && state->state != DH6S_DECLINE) 965 continue; 966 if (ap->ia_type != ifia->ia_type) 967 continue; 968 if (memcmp(ap->iaid, ifia->iaid, sizeof(ap->iaid))) 969 continue; 970 if (ap->ia_type == D6_OPTION_IA_PD) { 971 #ifndef SMALL 972 struct dhcp6_pd_addr pdp; 973 974 pdp.pltime = htonl(ap->prefix_pltime); 975 pdp.vltime = htonl(ap->prefix_vltime); 976 pdp.prefix_len = ap->prefix_len; 977 /* pdp.prefix is not aligned, so copy it in. */ 978 memcpy(&pdp.prefix, &ap->prefix, sizeof(pdp.prefix)); 979 COPYIN(D6_OPTION_IAPREFIX, &pdp, sizeof(pdp)); 980 ia_na_len = (uint16_t) 981 (ia_na_len + sizeof(o) + sizeof(pdp)); 982 983 /* RFC6603 Section 4.2 */ 984 if (ap->prefix_exclude_len) { 985 uint8_t exb[16], *ep, u8; 986 const uint8_t *pp; 987 988 n = (size_t)((ap->prefix_exclude_len - 989 ap->prefix_len - 1) / NBBY) + 1; 990 ep = exb; 991 *ep++ = (uint8_t)ap->prefix_exclude_len; 992 pp = ap->prefix_exclude.s6_addr; 993 pp += (size_t) 994 ((ap->prefix_len - 1) / NBBY) + 995 (n - 1); 996 u8 = ap->prefix_len % NBBY; 997 if (u8) 998 n--; 999 while (n-- > 0) 1000 *ep++ = *pp--; 1001 if (u8) 1002 *ep = (uint8_t)(*pp << u8); 1003 n++; 1004 COPYIN(D6_OPTION_PD_EXCLUDE, exb, 1005 (uint16_t)n); 1006 ia_na_len = (uint16_t) 1007 (ia_na_len + sizeof(o) + n); 1008 } 1009 #endif 1010 } else { 1011 struct dhcp6_ia_addr ia; 1012 1013 ia.addr = ap->addr; 1014 ia.pltime = htonl(ap->prefix_pltime); 1015 ia.vltime = htonl(ap->prefix_vltime); 1016 COPYIN(D6_OPTION_IA_ADDR, &ia, sizeof(ia)); 1017 ia_na_len = (uint16_t) 1018 (ia_na_len + sizeof(o) + sizeof(ia)); 1019 } 1020 } 1021 1022 /* Update the total option lenth. */ 1023 ia_na_len = htons(ia_na_len); 1024 memcpy(o_lenp, &ia_na_len, sizeof(ia_na_len)); 1025 } 1026 1027 if (state->send->type != DHCP6_RELEASE && 1028 state->send->type != DHCP6_DECLINE && 1029 n_options) 1030 { 1031 o_lenp = NEXTLEN; 1032 o.len = 0; 1033 COPYIN1(D6_OPTION_ORO, 0); 1034 for (l = 0, opt = ifp->ctx->dhcp6_opts; 1035 l < ifp->ctx->dhcp6_opts_len; 1036 l++, opt++) 1037 { 1038 #ifndef SMALL 1039 for (n = 0, opt2 = ifo->dhcp6_override; 1040 n < ifo->dhcp6_override_len; 1041 n++, opt2++) 1042 { 1043 if (opt->option == opt2->option) 1044 break; 1045 } 1046 if (n < ifo->dhcp6_override_len) 1047 continue; 1048 #endif 1049 if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6)) 1050 continue; 1051 o.code = htons((uint16_t)opt->option); 1052 memcpy(p, &o.code, sizeof(o.code)); 1053 p += sizeof(o.code); 1054 o.len = (uint16_t)(o.len + sizeof(o.code)); 1055 } 1056 #ifndef SMALL 1057 for (l = 0, opt = ifo->dhcp6_override; 1058 l < ifo->dhcp6_override_len; 1059 l++, opt++) 1060 { 1061 if (!DHC_REQOPT(opt, ifo->requestmask6, ifo->nomask6)) 1062 continue; 1063 o.code = htons((uint16_t)opt->option); 1064 memcpy(p, &o.code, sizeof(o.code)); 1065 p += sizeof(o.code); 1066 o.len = (uint16_t)(o.len + sizeof(o.code)); 1067 } 1068 if (dhcp6_findselfsla(ifp)) { 1069 o.code = htons(D6_OPTION_PD_EXCLUDE); 1070 memcpy(p, &o.code, sizeof(o.code)); 1071 p += sizeof(o.code); 1072 o.len = (uint16_t)(o.len + sizeof(o.code)); 1073 } 1074 #endif 1075 o.len = htons(o.len); 1076 memcpy(o_lenp, &o.len, sizeof(o.len)); 1077 } 1078 1079 si_len = 0; 1080 COPYIN(D6_OPTION_ELAPSED, &si_len, sizeof(si_len)); 1081 1082 if (state->state == DH6S_DISCOVER && 1083 !(ifp->ctx->options & DHCPCD_TEST) && 1084 DHC_REQ(ifo->requestmask6, ifo->nomask6, D6_OPTION_RAPID_COMMIT)) 1085 COPYIN1(D6_OPTION_RAPID_COMMIT, 0); 1086 1087 if (!has_option_mask(ifo->nomask6, D6_OPTION_USER_CLASS)) 1088 p += dhcp6_makeuser(p, ifp); 1089 if (!has_option_mask(ifo->nomask6, D6_OPTION_VENDOR_CLASS)) 1090 p += dhcp6_makevendor(p, ifp); 1091 1092 if (state->send->type != DHCP6_RELEASE && 1093 state->send->type != DHCP6_DECLINE) 1094 { 1095 if (fqdn != FQDN_DISABLE) { 1096 o_lenp = NEXTLEN; 1097 COPYIN1(D6_OPTION_FQDN, 0); 1098 if (hl == 0) 1099 *p = D6_FQDN_NONE; 1100 else { 1101 switch (fqdn) { 1102 case FQDN_BOTH: 1103 *p = D6_FQDN_BOTH; 1104 break; 1105 case FQDN_PTR: 1106 *p = D6_FQDN_PTR; 1107 break; 1108 default: 1109 *p = D6_FQDN_NONE; 1110 break; 1111 } 1112 } 1113 p++; 1114 encode_rfc1035(hostname, p); 1115 p += hl; 1116 o.len = htons((uint16_t)(hl + 1)); 1117 memcpy(o_lenp, &o.len, sizeof(o.len)); 1118 } 1119 1120 if (!has_option_mask(ifo->nomask6, D6_OPTION_MUDURL) && 1121 ifo->mudurl[0]) 1122 COPYIN(D6_OPTION_MUDURL, 1123 ifo->mudurl + 1, ifo->mudurl[0]); 1124 1125 #ifdef AUTH 1126 if ((ifo->auth.options & DHCPCD_AUTH_SENDREQUIRE) != 1127 DHCPCD_AUTH_SENDREQUIRE && 1128 DHC_REQ(ifo->requestmask6, ifo->nomask6, 1129 D6_OPTION_RECONF_ACCEPT)) 1130 COPYIN1(D6_OPTION_RECONF_ACCEPT, 0); 1131 #endif 1132 1133 } 1134 1135 #ifdef AUTH 1136 /* This has to be the last option */ 1137 if (ifo->auth.options & DHCPCD_AUTH_SEND && auth_len != 0) { 1138 COPYIN1(D6_OPTION_AUTH, auth_len); 1139 /* data will be filled at send message time */ 1140 } 1141 #endif 1142 1143 return 0; 1144 } 1145 1146 static const char * 1147 dhcp6_get_op(uint16_t type) 1148 { 1149 const struct dhcp6_op *d; 1150 1151 for (d = dhcp6_ops; d->name; d++) 1152 if (d->type == type) 1153 return d->name; 1154 return NULL; 1155 } 1156 1157 static void 1158 dhcp6_freedrop_addrs(struct interface *ifp, int drop, 1159 const struct interface *ifd) 1160 { 1161 struct dhcp6_state *state; 1162 1163 state = D6_STATE(ifp); 1164 if (state) { 1165 ipv6_freedrop_addrs(&state->addrs, drop, ifd); 1166 if (drop) 1167 rt_build(ifp->ctx, AF_INET6); 1168 } 1169 } 1170 1171 #ifndef SMALL 1172 static void dhcp6_delete_delegates(struct interface *ifp) 1173 { 1174 struct interface *ifp0; 1175 1176 if (ifp->ctx->ifaces) { 1177 TAILQ_FOREACH(ifp0, ifp->ctx->ifaces, next) { 1178 if (ifp0 != ifp) 1179 dhcp6_freedrop_addrs(ifp0, 1, ifp); 1180 } 1181 } 1182 } 1183 #endif 1184 1185 #ifdef AUTH 1186 static ssize_t 1187 dhcp6_update_auth(struct interface *ifp, struct dhcp6_message *m, size_t len) 1188 { 1189 struct dhcp6_state *state; 1190 uint8_t *opt; 1191 uint16_t opt_len; 1192 1193 opt = dhcp6_findmoption(m, len, D6_OPTION_AUTH, &opt_len); 1194 if (opt == NULL) 1195 return -1; 1196 1197 state = D6_STATE(ifp); 1198 return dhcp_auth_encode(ifp->ctx, &ifp->options->auth, 1199 state->auth.token, (uint8_t *)state->send, state->send_len, 6, 1200 state->send->type, opt, opt_len); 1201 } 1202 #endif 1203 1204 static const struct in6_addr alldhcp = IN6ADDR_LINKLOCAL_ALLDHCP_INIT; 1205 static int 1206 dhcp6_sendmessage(struct interface *ifp, void (*callback)(void *)) 1207 { 1208 struct dhcp6_state *state = D6_STATE(ifp); 1209 struct dhcpcd_ctx *ctx = ifp->ctx; 1210 unsigned int RT; 1211 bool broadcast = true; 1212 struct sockaddr_in6 dst = { 1213 .sin6_family = AF_INET6, 1214 /* Setting the port on Linux gives EINVAL when sending. 1215 * This looks like a kernel bug as the equivalent works 1216 * fine with the DHCP counterpart. */ 1217 #ifndef __linux__ 1218 .sin6_port = htons(DHCP6_SERVER_PORT), 1219 #endif 1220 }; 1221 struct udphdr udp = { 1222 .uh_sport = htons(DHCP6_CLIENT_PORT), 1223 .uh_dport = htons(DHCP6_SERVER_PORT), 1224 .uh_ulen = htons((uint16_t)(sizeof(udp) + state->send_len)), 1225 }; 1226 struct iovec iov[] = { 1227 { .iov_base = &udp, .iov_len = sizeof(udp), }, 1228 { .iov_base = state->send, .iov_len = state->send_len, }, 1229 }; 1230 union { 1231 struct cmsghdr hdr; 1232 uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))]; 1233 } cmsgbuf = { .buf = { 0 } }; 1234 struct msghdr msg = { 1235 .msg_name = &dst, .msg_namelen = sizeof(dst), 1236 .msg_iov = iov, .msg_iovlen = __arraycount(iov), 1237 }; 1238 char uaddr[INET6_ADDRSTRLEN]; 1239 1240 if (!callback && !if_is_link_up(ifp)) 1241 return 0; 1242 1243 if (!IN6_IS_ADDR_UNSPECIFIED(&state->unicast)) { 1244 switch (state->send->type) { 1245 case DHCP6_SOLICIT: /* FALLTHROUGH */ 1246 case DHCP6_CONFIRM: /* FALLTHROUGH */ 1247 case DHCP6_REBIND: 1248 /* Unicasting is denied for these types. */ 1249 break; 1250 default: 1251 broadcast = false; 1252 inet_ntop(AF_INET6, &state->unicast, uaddr, 1253 sizeof(uaddr)); 1254 break; 1255 } 1256 } 1257 dst.sin6_addr = broadcast ? alldhcp : state->unicast; 1258 1259 if (!callback) { 1260 logdebugx("%s: %s %s with xid 0x%02x%02x%02x%s%s", 1261 ifp->name, 1262 broadcast ? "broadcasting" : "unicasting", 1263 dhcp6_get_op(state->send->type), 1264 state->send->xid[0], 1265 state->send->xid[1], 1266 state->send->xid[2], 1267 !broadcast ? " " : "", 1268 !broadcast ? uaddr : ""); 1269 RT = 0; 1270 } else { 1271 if (state->IMD && 1272 !(ifp->options->options & DHCPCD_INITIAL_DELAY)) 1273 state->IMD = 0; 1274 if (state->IMD) { 1275 state->RT = state->IMD * MSEC_PER_SEC; 1276 /* Some buggy PPP servers close the link too early 1277 * after sending an invalid status in their reply 1278 * which means this host won't see it. 1279 * 1 second grace seems to be the sweet spot. */ 1280 if (ifp->flags & IFF_POINTOPOINT) 1281 state->RT += MSEC_PER_SEC; 1282 } else if (state->RTC == 0) 1283 state->RT = state->IRT * MSEC_PER_SEC; 1284 1285 if (state->MRT != 0) { 1286 unsigned int mrt = state->MRT * MSEC_PER_SEC; 1287 1288 if (state->RT > mrt) 1289 state->RT = mrt; 1290 } 1291 1292 /* Add -.1 to .1 * RT randomness as per RFC8415 section 15 */ 1293 uint32_t lru = arc4random_uniform( 1294 state->RTC == 0 ? DHCP6_RAND_MAX 1295 : DHCP6_RAND_MAX - DHCP6_RAND_MIN); 1296 int lr = (int)lru - (state->RTC == 0 ? 0 : DHCP6_RAND_MAX); 1297 RT = state->RT 1298 + (unsigned int)((float)state->RT 1299 * ((float)lr / DHCP6_RAND_DIV)); 1300 1301 if (if_is_link_up(ifp)) 1302 logdebugx("%s: %s %s (xid 0x%02x%02x%02x)%s%s," 1303 " next in %0.1f seconds", 1304 ifp->name, 1305 state->IMD != 0 ? "delaying" : 1306 broadcast ? "broadcasting" : "unicasting", 1307 dhcp6_get_op(state->send->type), 1308 state->send->xid[0], 1309 state->send->xid[1], 1310 state->send->xid[2], 1311 state->IMD == 0 && !broadcast ? " " : "", 1312 state->IMD == 0 && !broadcast ? uaddr : "", 1313 (float)RT / MSEC_PER_SEC); 1314 1315 /* Wait the initial delay */ 1316 if (state->IMD != 0) { 1317 state->IMD = 0; 1318 eloop_timeout_add_msec(ctx->eloop, RT, callback, ifp); 1319 return 0; 1320 } 1321 } 1322 1323 if (!if_is_link_up(ifp)) 1324 return 0; 1325 1326 /* Update the elapsed time */ 1327 dhcp6_updateelapsed(ifp, state->send, state->send_len); 1328 #ifdef AUTH 1329 if (ifp->options->auth.options & DHCPCD_AUTH_SEND && 1330 dhcp6_update_auth(ifp, state->send, state->send_len) == -1) 1331 { 1332 logerr("%s: %s: dhcp6_updateauth", __func__, ifp->name); 1333 if (errno != ESRCH) 1334 return -1; 1335 } 1336 #endif 1337 1338 /* Set the outbound interface */ 1339 if (broadcast) { 1340 struct cmsghdr *cm; 1341 struct in6_pktinfo pi = { .ipi6_ifindex = ifp->index }; 1342 1343 dst.sin6_scope_id = ifp->index; 1344 msg.msg_control = cmsgbuf.buf; 1345 msg.msg_controllen = sizeof(cmsgbuf.buf); 1346 cm = CMSG_FIRSTHDR(&msg); 1347 if (cm == NULL) /* unlikely */ 1348 return -1; 1349 cm->cmsg_level = IPPROTO_IPV6; 1350 cm->cmsg_type = IPV6_PKTINFO; 1351 cm->cmsg_len = CMSG_LEN(sizeof(pi)); 1352 memcpy(CMSG_DATA(cm), &pi, sizeof(pi)); 1353 } 1354 1355 #ifdef PRIVSEP 1356 if (IN_PRIVSEP(ifp->ctx)) { 1357 if (ps_inet_senddhcp6(ifp, &msg) == -1) 1358 logerr(__func__); 1359 goto sent; 1360 } 1361 #endif 1362 1363 if (sendmsg(ctx->dhcp6_wfd, &msg, 0) == -1) { 1364 logerr("%s: %s: sendmsg", __func__, ifp->name); 1365 /* Allow DHCPv6 to continue .... the errors 1366 * would be rate limited by the protocol. 1367 * Generally the error is ENOBUFS when struggling to 1368 * associate with an access point. */ 1369 } 1370 1371 #ifdef PRIVSEP 1372 sent: 1373 #endif 1374 state->RTC++; 1375 if (callback) { 1376 state->RT = RT * 2; 1377 if (state->RT < RT) /* Check overflow */ 1378 state->RT = RT; 1379 if (state->MRC == 0 || state->RTC < state->MRC) 1380 eloop_timeout_add_msec(ctx->eloop, 1381 RT, callback, ifp); 1382 else if (state->MRC != 0 && state->MRCcallback) 1383 eloop_timeout_add_msec(ctx->eloop, 1384 RT, state->MRCcallback, ifp); 1385 else 1386 logwarnx("%s: sent %d times with no reply", 1387 ifp->name, state->RTC); 1388 } 1389 return 0; 1390 } 1391 1392 static void 1393 dhcp6_sendinform(void *arg) 1394 { 1395 1396 dhcp6_sendmessage(arg, dhcp6_sendinform); 1397 } 1398 1399 static void 1400 dhcp6_senddiscover(void *arg) 1401 { 1402 1403 dhcp6_sendmessage(arg, dhcp6_senddiscover); 1404 } 1405 1406 static void 1407 dhcp6_sendrequest(void *arg) 1408 { 1409 1410 dhcp6_sendmessage(arg, dhcp6_sendrequest); 1411 } 1412 1413 static void 1414 dhcp6_sendrebind(void *arg) 1415 { 1416 1417 dhcp6_sendmessage(arg, dhcp6_sendrebind); 1418 } 1419 1420 static void 1421 dhcp6_sendrenew(void *arg) 1422 { 1423 1424 dhcp6_sendmessage(arg, dhcp6_sendrenew); 1425 } 1426 1427 static void 1428 dhcp6_sendconfirm(void *arg) 1429 { 1430 1431 dhcp6_sendmessage(arg, dhcp6_sendconfirm); 1432 } 1433 1434 static void 1435 dhcp6_senddecline(void *arg) 1436 { 1437 1438 dhcp6_sendmessage(arg, dhcp6_senddecline); 1439 } 1440 1441 static void 1442 dhcp6_sendrelease(void *arg) 1443 { 1444 1445 dhcp6_sendmessage(arg, dhcp6_sendrelease); 1446 } 1447 1448 static void 1449 dhcp6_startrenew(void *arg) 1450 { 1451 struct interface *ifp; 1452 struct dhcp6_state *state; 1453 1454 ifp = arg; 1455 if ((state = D6_STATE(ifp)) == NULL) 1456 return; 1457 1458 /* Only renew in the bound or renew states */ 1459 if (state->state != DH6S_BOUND && 1460 state->state != DH6S_RENEW) 1461 return; 1462 1463 /* Remove the timeout as the renew may have been forced. */ 1464 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_startrenew, ifp); 1465 1466 state->state = DH6S_RENEW; 1467 state->RTC = 0; 1468 state->IMD = REN_MAX_DELAY; 1469 state->IRT = REN_TIMEOUT; 1470 state->MRT = REN_MAX_RT; 1471 state->MRC = 0; 1472 1473 if (dhcp6_makemessage(ifp) == -1) 1474 logerr("%s: %s", __func__, ifp->name); 1475 else 1476 dhcp6_sendrenew(ifp); 1477 } 1478 1479 void dhcp6_renew(struct interface *ifp) 1480 { 1481 1482 dhcp6_startrenew(ifp); 1483 } 1484 1485 bool 1486 dhcp6_dadcompleted(const struct interface *ifp) 1487 { 1488 const struct dhcp6_state *state; 1489 const struct ipv6_addr *ap; 1490 1491 state = D6_CSTATE(ifp); 1492 TAILQ_FOREACH(ap, &state->addrs, next) { 1493 if (ap->flags & IPV6_AF_ADDED && 1494 !(ap->flags & IPV6_AF_DADCOMPLETED)) 1495 return false; 1496 } 1497 return true; 1498 } 1499 1500 static void 1501 dhcp6_dadcallback(void *arg) 1502 { 1503 struct ipv6_addr *ia = arg; 1504 struct interface *ifp; 1505 struct dhcp6_state *state; 1506 struct ipv6_addr *ia2; 1507 bool completed, valid, oneduplicated; 1508 1509 completed = (ia->flags & IPV6_AF_DADCOMPLETED); 1510 ia->flags |= IPV6_AF_DADCOMPLETED; 1511 if (ia->addr_flags & IN6_IFF_DUPLICATED) 1512 logwarnx("%s: DAD detected %s", ia->iface->name, ia->saddr); 1513 1514 #ifdef ND6_ADVERTISE 1515 else 1516 ipv6nd_advertise(ia); 1517 #endif 1518 if (completed) 1519 return; 1520 1521 ifp = ia->iface; 1522 state = D6_STATE(ifp); 1523 if (state->state != DH6S_BOUND && state->state != DH6S_DELEGATED) 1524 return; 1525 1526 #ifdef SMALL 1527 valid = true; 1528 #else 1529 valid = (ia->delegating_prefix == NULL); 1530 #endif 1531 completed = true; 1532 oneduplicated = false; 1533 TAILQ_FOREACH(ia2, &state->addrs, next) { 1534 if (ia2->flags & IPV6_AF_ADDED && 1535 !(ia2->flags & IPV6_AF_DADCOMPLETED)) 1536 { 1537 completed = false; 1538 break; 1539 } 1540 if (DECLINE_IA(ia)) 1541 oneduplicated = true; 1542 } 1543 if (!completed) 1544 return; 1545 1546 logdebugx("%s: DHCPv6 DAD completed", ifp->name); 1547 1548 if (oneduplicated && state->state == DH6S_BOUND) { 1549 dhcp6_startdecline(ifp); 1550 return; 1551 } 1552 1553 script_runreason(ifp, 1554 #ifndef SMALL 1555 ia->delegating_prefix ? "DELEGATED6" : 1556 #endif 1557 state->reason); 1558 if (valid) 1559 dhcpcd_daemonise(ifp->ctx); 1560 } 1561 1562 static void 1563 dhcp6_addrequestedaddrs(struct interface *ifp) 1564 { 1565 struct dhcp6_state *state; 1566 size_t i; 1567 struct if_ia *ia; 1568 struct ipv6_addr *a; 1569 1570 state = D6_STATE(ifp); 1571 /* Add any requested prefixes / addresses */ 1572 for (i = 0; i < ifp->options->ia_len; i++) { 1573 ia = &ifp->options->ia[i]; 1574 if (!((ia->ia_type == D6_OPTION_IA_PD && ia->prefix_len) || 1575 !IN6_IS_ADDR_UNSPECIFIED(&ia->addr))) 1576 continue; 1577 a = ipv6_newaddr(ifp, &ia->addr, 1578 /* 1579 * RFC 5942 Section 5 1580 * We cannot assume any prefix length, nor tie the 1581 * address to an existing one as it could expire 1582 * before the address. 1583 * As such we just give it a 128 prefix. 1584 */ 1585 ia->ia_type == D6_OPTION_IA_PD ? ia->prefix_len : 128, 1586 IPV6_AF_REQUEST); 1587 if (a == NULL) 1588 continue; 1589 a->dadcallback = dhcp6_dadcallback; 1590 memcpy(&a->iaid, &ia->iaid, sizeof(a->iaid)); 1591 a->ia_type = ia->ia_type; 1592 TAILQ_INSERT_TAIL(&state->addrs, a, next); 1593 } 1594 } 1595 1596 static void 1597 dhcp6_startdiscover(void *arg) 1598 { 1599 struct interface *ifp; 1600 struct dhcp6_state *state; 1601 int llevel; 1602 1603 ifp = arg; 1604 state = D6_STATE(ifp); 1605 #ifndef SMALL 1606 if (state->reason == NULL || strcmp(state->reason, "TIMEOUT6") != 0) 1607 dhcp6_delete_delegates(ifp); 1608 #endif 1609 if (state->new == NULL && !state->failed) 1610 llevel = LOG_INFO; 1611 else 1612 llevel = LOG_DEBUG; 1613 logmessage(llevel, "%s: soliciting a DHCPv6 lease", ifp->name); 1614 state->state = DH6S_DISCOVER; 1615 state->RTC = 0; 1616 state->IMD = SOL_MAX_DELAY; 1617 state->IRT = SOL_TIMEOUT; 1618 state->MRT = state->sol_max_rt; 1619 state->MRC = SOL_MAX_RC; 1620 1621 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 1622 free(state->new); 1623 state->new = NULL; 1624 state->new_len = 0; 1625 1626 if (dhcp6_makemessage(ifp) == -1) 1627 logerr("%s: %s", __func__, ifp->name); 1628 else 1629 dhcp6_senddiscover(ifp); 1630 } 1631 1632 static void 1633 dhcp6_startinform(void *arg) 1634 { 1635 struct interface *ifp; 1636 struct dhcp6_state *state; 1637 int llevel; 1638 1639 ifp = arg; 1640 state = D6_STATE(ifp); 1641 if (state->new == NULL && !state->failed) 1642 llevel = LOG_INFO; 1643 else 1644 llevel = LOG_DEBUG; 1645 logmessage(llevel, "%s: requesting DHCPv6 information", ifp->name); 1646 state->state = DH6S_INFORM; 1647 state->RTC = 0; 1648 state->IMD = INF_MAX_DELAY; 1649 state->IRT = INF_TIMEOUT; 1650 state->MRT = state->inf_max_rt; 1651 state->MRC = 0; 1652 1653 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 1654 if (dhcp6_makemessage(ifp) == -1) { 1655 logerr("%s: %s", __func__, ifp->name); 1656 return; 1657 } 1658 dhcp6_sendinform(ifp); 1659 /* RFC3315 18.1.2 says that if CONFIRM failed then the prior addresses 1660 * SHOULD be used. The wording here is poor, because the addresses are 1661 * merely one facet of the lease as a whole. 1662 * This poor wording might explain the lack of similar text for INFORM 1663 * in 18.1.5 because there are no addresses in the INFORM message. */ 1664 eloop_timeout_add_sec(ifp->ctx->eloop, 1665 INF_MAX_RD, dhcp6_failinform, ifp); 1666 } 1667 1668 static bool 1669 dhcp6_startdiscoinform(struct interface *ifp) 1670 { 1671 unsigned long long opts = ifp->options->options; 1672 1673 if (opts & DHCPCD_IA_FORCED || ipv6nd_hasradhcp(ifp, true)) 1674 dhcp6_startdiscover(ifp); 1675 else if (opts & DHCPCD_INFORM6 || ipv6nd_hasradhcp(ifp, false)) 1676 dhcp6_startinform(ifp); 1677 else 1678 return false; 1679 return true; 1680 } 1681 1682 static void 1683 dhcp6_leaseextend(struct interface *ifp) 1684 { 1685 struct dhcp6_state *state = D6_STATE(ifp); 1686 struct ipv6_addr *ia; 1687 1688 logwarnx("%s: extending DHCPv6 lease", ifp->name); 1689 TAILQ_FOREACH(ia, &state->addrs, next) { 1690 ia->flags |= IPV6_AF_EXTENDED; 1691 /* Set infinite lifetimes. */ 1692 ia->prefix_pltime = ND6_INFINITE_LIFETIME; 1693 ia->prefix_vltime = ND6_INFINITE_LIFETIME; 1694 } 1695 } 1696 1697 static void 1698 dhcp6_fail(struct interface *ifp) 1699 { 1700 struct dhcp6_state *state = D6_STATE(ifp); 1701 1702 state->failed = true; 1703 1704 /* RFC3315 18.1.2 says that prior addresses SHOULD be used on failure. 1705 * RFC2131 3.2.3 says that MAY chose to use the prior address. 1706 * Because dhcpcd was written first for RFC2131, we have the LASTLEASE 1707 * option which defaults to off as that makes the most sense for 1708 * mobile clients. 1709 * dhcpcd also has LASTLEASE_EXTEND to extend this lease past it's 1710 * expiry, but this is strictly not RFC compliant in any way or form. */ 1711 if (state->new != NULL && 1712 ifp->options->options & DHCPCD_LASTLEASE_EXTEND) 1713 { 1714 dhcp6_leaseextend(ifp); 1715 dhcp6_bind(ifp, NULL, NULL); 1716 } else { 1717 dhcp6_freedrop_addrs(ifp, 1, NULL); 1718 #ifndef SMALL 1719 dhcp6_delete_delegates(ifp); 1720 #endif 1721 free(state->old); 1722 state->old = state->new; 1723 state->old_len = state->new_len; 1724 state->new = NULL; 1725 state->new_len = 0; 1726 if (state->old != NULL) 1727 script_runreason(ifp, "EXPIRE6"); 1728 dhcp_unlink(ifp->ctx, state->leasefile); 1729 dhcp6_addrequestedaddrs(ifp); 1730 } 1731 1732 if (!dhcp6_startdiscoinform(ifp)) { 1733 logwarnx("%s: no advertising IPv6 router wants DHCP",ifp->name); 1734 state->state = DH6S_INIT; 1735 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 1736 } 1737 } 1738 1739 static int 1740 dhcp6_failloglevel(struct interface *ifp) 1741 { 1742 const struct dhcp6_state *state = D6_CSTATE(ifp); 1743 1744 return state->failed ? LOG_DEBUG : LOG_ERR; 1745 } 1746 1747 static void 1748 dhcp6_failconfirm(void *arg) 1749 { 1750 struct interface *ifp = arg; 1751 int llevel = dhcp6_failloglevel(ifp); 1752 1753 logmessage(llevel, "%s: failed to confirm prior DHCPv6 address", 1754 ifp->name); 1755 dhcp6_fail(ifp); 1756 } 1757 1758 static void 1759 dhcp6_failrequest(void *arg) 1760 { 1761 struct interface *ifp = arg; 1762 int llevel = dhcp6_failloglevel(ifp); 1763 1764 logmessage(llevel, "%s: failed to request DHCPv6 address", ifp->name); 1765 dhcp6_fail(ifp); 1766 } 1767 1768 static void 1769 dhcp6_failinform(void *arg) 1770 { 1771 struct interface *ifp = arg; 1772 int llevel = dhcp6_failloglevel(ifp); 1773 1774 logmessage(llevel, "%s: failed to request DHCPv6 information", 1775 ifp->name); 1776 dhcp6_fail(ifp); 1777 } 1778 1779 #ifndef SMALL 1780 static void 1781 dhcp6_failrebind(void *arg) 1782 { 1783 struct interface *ifp = arg; 1784 1785 logerrx("%s: failed to rebind prior DHCPv6 delegation", ifp->name); 1786 dhcp6_fail(ifp); 1787 } 1788 1789 static int 1790 dhcp6_hasprefixdelegation(struct interface *ifp) 1791 { 1792 size_t i; 1793 uint16_t t; 1794 1795 t = 0; 1796 for (i = 0; i < ifp->options->ia_len; i++) { 1797 if (t && t != ifp->options->ia[i].ia_type) { 1798 if (t == D6_OPTION_IA_PD || 1799 ifp->options->ia[i].ia_type == D6_OPTION_IA_PD) 1800 return 2; 1801 } 1802 t = ifp->options->ia[i].ia_type; 1803 } 1804 return t == D6_OPTION_IA_PD ? 1 : 0; 1805 } 1806 #endif 1807 1808 static void 1809 dhcp6_startrebind(void *arg) 1810 { 1811 struct interface *ifp; 1812 struct dhcp6_state *state; 1813 #ifndef SMALL 1814 int pd; 1815 #endif 1816 1817 ifp = arg; 1818 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_sendrenew, ifp); 1819 state = D6_STATE(ifp); 1820 if (state->state == DH6S_RENEW) 1821 logwarnx("%s: failed to renew DHCPv6, rebinding", ifp->name); 1822 else 1823 loginfox("%s: rebinding prior DHCPv6 lease", ifp->name); 1824 state->state = DH6S_REBIND; 1825 state->RTC = 0; 1826 state->MRC = 0; 1827 1828 #ifndef SMALL 1829 /* RFC 3633 section 12.1 */ 1830 pd = dhcp6_hasprefixdelegation(ifp); 1831 if (pd) { 1832 state->IMD = CNF_MAX_DELAY; 1833 state->IRT = CNF_TIMEOUT; 1834 state->MRT = CNF_MAX_RT; 1835 } else 1836 #endif 1837 { 1838 state->IMD = REB_MAX_DELAY; 1839 state->IRT = REB_TIMEOUT; 1840 state->MRT = REB_MAX_RT; 1841 } 1842 1843 if (dhcp6_makemessage(ifp) == -1) 1844 logerr("%s: %s", __func__, ifp->name); 1845 else 1846 dhcp6_sendrebind(ifp); 1847 1848 #ifndef SMALL 1849 /* RFC 3633 section 12.1 */ 1850 if (pd) 1851 eloop_timeout_add_sec(ifp->ctx->eloop, 1852 CNF_MAX_RD, dhcp6_failrebind, ifp); 1853 #endif 1854 } 1855 1856 1857 static void 1858 dhcp6_startrequest(struct interface *ifp) 1859 { 1860 struct dhcp6_state *state; 1861 1862 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_senddiscover, ifp); 1863 state = D6_STATE(ifp); 1864 state->state = DH6S_REQUEST; 1865 state->RTC = 0; 1866 state->IMD = 0; 1867 state->IRT = REQ_TIMEOUT; 1868 state->MRT = REQ_MAX_RT; 1869 state->MRC = REQ_MAX_RC; 1870 state->MRCcallback = dhcp6_failrequest; 1871 1872 if (dhcp6_makemessage(ifp) == -1) { 1873 logerr("%s: %s", __func__, ifp->name); 1874 return; 1875 } 1876 1877 dhcp6_sendrequest(ifp); 1878 } 1879 1880 static void 1881 dhcp6_startconfirm(struct interface *ifp) 1882 { 1883 struct dhcp6_state *state; 1884 struct ipv6_addr *ia; 1885 1886 state = D6_STATE(ifp); 1887 1888 TAILQ_FOREACH(ia, &state->addrs, next) { 1889 if (!DECLINE_IA(ia)) 1890 continue; 1891 logerrx("%s: prior DHCPv6 has a duplicated address", ifp->name); 1892 dhcp6_startdecline(ifp); 1893 return; 1894 } 1895 1896 state->state = DH6S_CONFIRM; 1897 state->RTC = 0; 1898 state->IMD = CNF_MAX_DELAY; 1899 state->IRT = CNF_TIMEOUT; 1900 state->MRT = CNF_MAX_RT; 1901 state->MRC = CNF_MAX_RC; 1902 1903 loginfox("%s: confirming prior DHCPv6 lease", ifp->name); 1904 1905 if (dhcp6_makemessage(ifp) == -1) { 1906 logerr("%s: %s", __func__, ifp->name); 1907 return; 1908 } 1909 dhcp6_sendconfirm(ifp); 1910 eloop_timeout_add_sec(ifp->ctx->eloop, 1911 CNF_MAX_RD, dhcp6_failconfirm, ifp); 1912 } 1913 1914 static void 1915 dhcp6_startexpire(void *arg) 1916 { 1917 struct interface *ifp; 1918 1919 ifp = arg; 1920 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_sendrebind, ifp); 1921 1922 logerrx("%s: DHCPv6 lease expired", ifp->name); 1923 dhcp6_fail(ifp); 1924 } 1925 1926 static void 1927 dhcp6_faildecline(void *arg) 1928 { 1929 struct interface *ifp = arg; 1930 1931 logerrx("%s: failed to decline duplicated DHCPv6 addresses", ifp->name); 1932 dhcp6_fail(ifp); 1933 } 1934 1935 static void 1936 dhcp6_startdecline(struct interface *ifp) 1937 { 1938 struct dhcp6_state *state; 1939 1940 state = D6_STATE(ifp); 1941 loginfox("%s: declining failed DHCPv6 addresses", ifp->name); 1942 state->state = DH6S_DECLINE; 1943 state->RTC = 0; 1944 state->IMD = 0; 1945 state->IRT = DEC_TIMEOUT; 1946 state->MRT = 0; 1947 state->MRC = DEC_MAX_RC; 1948 state->MRCcallback = dhcp6_faildecline; 1949 1950 if (dhcp6_makemessage(ifp) == -1) 1951 logerr("%s: %s", __func__, ifp->name); 1952 else 1953 dhcp6_senddecline(ifp); 1954 } 1955 1956 static void 1957 dhcp6_finishrelease(void *arg) 1958 { 1959 struct interface *ifp; 1960 struct dhcp6_state *state; 1961 1962 ifp = (struct interface *)arg; 1963 if ((state = D6_STATE(ifp)) != NULL) { 1964 state->state = DH6S_RELEASED; 1965 dhcp6_drop(ifp, "RELEASE6"); 1966 } 1967 } 1968 1969 static void 1970 dhcp6_startrelease(struct interface *ifp) 1971 { 1972 struct dhcp6_state *state; 1973 1974 state = D6_STATE(ifp); 1975 if (state->state != DH6S_BOUND) 1976 return; 1977 1978 state->state = DH6S_RELEASE; 1979 state->RTC = 0; 1980 state->IMD = REL_MAX_DELAY; 1981 state->IRT = REL_TIMEOUT; 1982 state->MRT = REL_MAX_RT; 1983 /* MRC of REL_MAX_RC is optional in RFC 3315 18.1.6 */ 1984 #if 0 1985 state->MRC = REL_MAX_RC; 1986 state->MRCcallback = dhcp6_finishrelease; 1987 #else 1988 state->MRC = 0; 1989 state->MRCcallback = NULL; 1990 #endif 1991 1992 if (dhcp6_makemessage(ifp) == -1) 1993 logerr("%s: %s", __func__, ifp->name); 1994 else { 1995 dhcp6_sendrelease(ifp); 1996 dhcp6_finishrelease(ifp); 1997 } 1998 } 1999 2000 static int 2001 dhcp6_checkstatusok(const struct interface *ifp, 2002 struct dhcp6_message *m, uint8_t *p, size_t len) 2003 { 2004 struct dhcp6_state *state; 2005 uint8_t *opt; 2006 uint16_t opt_len, code; 2007 size_t mlen; 2008 void * (*f)(void *, size_t, uint16_t, uint16_t *), *farg; 2009 char buf[32], *sbuf; 2010 const char *status; 2011 int loglevel; 2012 2013 state = D6_STATE(ifp); 2014 f = p ? dhcp6_findoption : dhcp6_findmoption; 2015 if (p) 2016 farg = p; 2017 else 2018 farg = m; 2019 if ((opt = f(farg, len, D6_OPTION_STATUS_CODE, &opt_len)) == NULL) { 2020 //logdebugx("%s: no status", ifp->name); 2021 state->lerror = 0; 2022 errno = ESRCH; 2023 return 0; 2024 } 2025 2026 if (opt_len < sizeof(code)) { 2027 logerrx("%s: status truncated", ifp->name); 2028 return -1; 2029 } 2030 memcpy(&code, opt, sizeof(code)); 2031 code = ntohs(code); 2032 if (code == D6_STATUS_OK) { 2033 state->lerror = 0; 2034 errno = 0; 2035 return 0; 2036 } 2037 2038 /* Anything after the code is a message. */ 2039 opt += sizeof(code); 2040 mlen = opt_len - sizeof(code); 2041 if (mlen == 0) { 2042 sbuf = NULL; 2043 if (code < sizeof(dhcp6_statuses) / sizeof(char *)) 2044 status = dhcp6_statuses[code]; 2045 else { 2046 snprintf(buf, sizeof(buf), "Unknown Status (%d)", code); 2047 status = buf; 2048 } 2049 } else { 2050 if ((sbuf = malloc(mlen + 1)) == NULL) { 2051 logerr(__func__); 2052 return -1; 2053 } 2054 memcpy(sbuf, opt, mlen); 2055 sbuf[mlen] = '\0'; 2056 status = sbuf; 2057 } 2058 2059 if (state->lerror == code || state->state == DH6S_INIT) 2060 loglevel = LOG_DEBUG; 2061 else 2062 loglevel = LOG_ERR; 2063 logmessage(loglevel, "%s: DHCPv6 REPLY: %s", ifp->name, status); 2064 free(sbuf); 2065 state->lerror = code; 2066 errno = 0; 2067 return (int)code; 2068 } 2069 2070 const struct ipv6_addr * 2071 dhcp6_iffindaddr(const struct interface *ifp, const struct in6_addr *addr, 2072 unsigned int flags) 2073 { 2074 const struct dhcp6_state *state; 2075 const struct ipv6_addr *ap; 2076 2077 if ((state = D6_STATE(ifp)) != NULL) { 2078 TAILQ_FOREACH(ap, &state->addrs, next) { 2079 if (ipv6_findaddrmatch(ap, addr, flags)) 2080 return ap; 2081 } 2082 } 2083 return NULL; 2084 } 2085 2086 struct ipv6_addr * 2087 dhcp6_findaddr(struct dhcpcd_ctx *ctx, const struct in6_addr *addr, 2088 unsigned int flags) 2089 { 2090 struct interface *ifp; 2091 struct ipv6_addr *ap; 2092 struct dhcp6_state *state; 2093 2094 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 2095 if ((state = D6_STATE(ifp)) != NULL) { 2096 TAILQ_FOREACH(ap, &state->addrs, next) { 2097 if (ipv6_findaddrmatch(ap, addr, flags)) 2098 return ap; 2099 } 2100 } 2101 } 2102 return NULL; 2103 } 2104 2105 static int 2106 dhcp6_findna(struct interface *ifp, uint16_t ot, const uint8_t *iaid, 2107 uint8_t *d, size_t l, const struct timespec *acquired) 2108 { 2109 struct dhcp6_state *state; 2110 uint8_t *o, *nd; 2111 uint16_t ol; 2112 struct ipv6_addr *a; 2113 int i; 2114 struct dhcp6_ia_addr ia; 2115 2116 i = 0; 2117 state = D6_STATE(ifp); 2118 while ((o = dhcp6_findoption(d, l, D6_OPTION_IA_ADDR, &ol))) { 2119 /* Set d and l first to ensure we find the next option. */ 2120 nd = o + ol; 2121 l -= (size_t)(nd - d); 2122 d = nd; 2123 if (ol < sizeof(ia)) { 2124 errno = EINVAL; 2125 logerrx("%s: IA Address option truncated", ifp->name); 2126 continue; 2127 } 2128 memcpy(&ia, o, sizeof(ia)); 2129 ia.pltime = ntohl(ia.pltime); 2130 ia.vltime = ntohl(ia.vltime); 2131 /* RFC 3315 22.6 */ 2132 if (ia.pltime > ia.vltime) { 2133 errno = EINVAL; 2134 logerr("%s: IA Address pltime %"PRIu32 2135 " > vltime %"PRIu32, 2136 ifp->name, ia.pltime, ia.vltime); 2137 continue; 2138 } 2139 TAILQ_FOREACH(a, &state->addrs, next) { 2140 if (ipv6_findaddrmatch(a, &ia.addr, 0)) 2141 break; 2142 } 2143 if (a == NULL) { 2144 /* 2145 * RFC 5942 Section 5 2146 * We cannot assume any prefix length, nor tie the 2147 * address to an existing one as it could expire 2148 * before the address. 2149 * As such we just give it a 128 prefix. 2150 */ 2151 a = ipv6_newaddr(ifp, &ia.addr, 128, IPV6_AF_ONLINK); 2152 a->dadcallback = dhcp6_dadcallback; 2153 a->ia_type = ot; 2154 memcpy(a->iaid, iaid, sizeof(a->iaid)); 2155 a->created = *acquired; 2156 2157 TAILQ_INSERT_TAIL(&state->addrs, a, next); 2158 } else { 2159 if (!(a->flags & IPV6_AF_ONLINK)) 2160 a->flags |= IPV6_AF_ONLINK | IPV6_AF_NEW; 2161 a->flags &= ~(IPV6_AF_STALE | IPV6_AF_EXTENDED); 2162 } 2163 a->acquired = *acquired; 2164 a->prefix_pltime = ia.pltime; 2165 if (a->prefix_vltime != ia.vltime) { 2166 a->flags |= IPV6_AF_NEW; 2167 a->prefix_vltime = ia.vltime; 2168 } 2169 if (a->prefix_pltime && a->prefix_pltime < state->lowpl) 2170 state->lowpl = a->prefix_pltime; 2171 if (a->prefix_vltime && a->prefix_vltime > state->expire) 2172 state->expire = a->prefix_vltime; 2173 i++; 2174 } 2175 return i; 2176 } 2177 2178 #ifndef SMALL 2179 static int 2180 dhcp6_findpd(struct interface *ifp, const uint8_t *iaid, 2181 uint8_t *d, size_t l, const struct timespec *acquired) 2182 { 2183 struct dhcp6_state *state; 2184 uint8_t *o, *nd; 2185 struct ipv6_addr *a; 2186 int i; 2187 uint8_t nb, *pw; 2188 uint16_t ol; 2189 struct dhcp6_pd_addr pdp; 2190 struct in6_addr pdp_prefix; 2191 2192 i = 0; 2193 state = D6_STATE(ifp); 2194 while ((o = dhcp6_findoption(d, l, D6_OPTION_IAPREFIX, &ol))) { 2195 /* Set d and l first to ensure we find the next option. */ 2196 nd = o + ol; 2197 l -= (size_t)(nd - d); 2198 d = nd; 2199 if (ol < sizeof(pdp)) { 2200 errno = EINVAL; 2201 logerrx("%s: IA Prefix option truncated", ifp->name); 2202 continue; 2203 } 2204 2205 memcpy(&pdp, o, sizeof(pdp)); 2206 pdp.pltime = ntohl(pdp.pltime); 2207 pdp.vltime = ntohl(pdp.vltime); 2208 /* RFC 3315 22.6 */ 2209 if (pdp.pltime > pdp.vltime) { 2210 errno = EINVAL; 2211 logerrx("%s: IA Prefix pltime %"PRIu32 2212 " > vltime %"PRIu32, 2213 ifp->name, pdp.pltime, pdp.vltime); 2214 continue; 2215 } 2216 2217 o += sizeof(pdp); 2218 ol = (uint16_t)(ol - sizeof(pdp)); 2219 2220 /* pdp.prefix is not aligned so copy it out. */ 2221 memcpy(&pdp_prefix, &pdp.prefix, sizeof(pdp_prefix)); 2222 TAILQ_FOREACH(a, &state->addrs, next) { 2223 if (IN6_ARE_ADDR_EQUAL(&a->prefix, &pdp_prefix)) 2224 break; 2225 } 2226 2227 if (a == NULL) { 2228 a = ipv6_newaddr(ifp, &pdp_prefix, pdp.prefix_len, 2229 IPV6_AF_DELEGATEDPFX); 2230 if (a == NULL) 2231 break; 2232 a->created = *acquired; 2233 a->dadcallback = dhcp6_dadcallback; 2234 a->ia_type = D6_OPTION_IA_PD; 2235 memcpy(a->iaid, iaid, sizeof(a->iaid)); 2236 TAILQ_INSERT_TAIL(&state->addrs, a, next); 2237 } else { 2238 if (!(a->flags & IPV6_AF_DELEGATEDPFX)) 2239 a->flags |= IPV6_AF_NEW | IPV6_AF_DELEGATEDPFX; 2240 a->flags &= ~(IPV6_AF_STALE | 2241 IPV6_AF_EXTENDED | 2242 IPV6_AF_REQUEST); 2243 if (a->prefix_vltime != pdp.vltime) 2244 a->flags |= IPV6_AF_NEW; 2245 } 2246 2247 a->acquired = *acquired; 2248 a->prefix_pltime = pdp.pltime; 2249 a->prefix_vltime = pdp.vltime; 2250 2251 if (a->prefix_pltime && a->prefix_pltime < state->lowpl) 2252 state->lowpl = a->prefix_pltime; 2253 if (a->prefix_vltime && a->prefix_vltime > state->expire) 2254 state->expire = a->prefix_vltime; 2255 i++; 2256 2257 a->prefix_exclude_len = 0; 2258 memset(&a->prefix_exclude, 0, sizeof(a->prefix_exclude)); 2259 o = dhcp6_findoption(o, ol, D6_OPTION_PD_EXCLUDE, &ol); 2260 if (o == NULL) 2261 continue; 2262 2263 /* RFC 6603 4.2 says option length MUST be between 2 and 17. 2264 * This allows 1 octet for prefix length and 16 for the 2265 * subnet ID. */ 2266 if (ol < 2 || ol > 17) { 2267 logerrx("%s: invalid PD Exclude option", ifp->name); 2268 continue; 2269 } 2270 2271 /* RFC 6603 4.2 says prefix length MUST be between the 2272 * length of the IAPREFIX prefix length + 1 and 128. */ 2273 if (*o < a->prefix_len + 1 || *o > 128) { 2274 logerrx("%s: invalid PD Exclude length", ifp->name); 2275 continue; 2276 } 2277 2278 ol--; 2279 /* Check option length matches prefix length. */ 2280 if (((*o - a->prefix_len - 1) / NBBY) + 1 != ol) { 2281 logerrx("%s: PD Exclude length mismatch", ifp->name); 2282 continue; 2283 } 2284 a->prefix_exclude_len = *o++; 2285 2286 memcpy(&a->prefix_exclude, &a->prefix, 2287 sizeof(a->prefix_exclude)); 2288 nb = a->prefix_len % NBBY; 2289 if (nb) 2290 ol--; 2291 pw = a->prefix_exclude.s6_addr + 2292 (a->prefix_exclude_len / NBBY) - 1; 2293 while (ol-- > 0) 2294 *pw-- = *o++; 2295 if (nb) 2296 *pw = (uint8_t)(*pw | (*o >> nb)); 2297 } 2298 return i; 2299 } 2300 #endif 2301 2302 static int 2303 dhcp6_findia(struct interface *ifp, struct dhcp6_message *m, size_t l, 2304 const char *sfrom, const struct timespec *acquired) 2305 { 2306 struct dhcp6_state *state; 2307 const struct if_options *ifo; 2308 struct dhcp6_option o; 2309 uint8_t *d, *p; 2310 struct dhcp6_ia_na ia; 2311 int i, e, error; 2312 size_t j; 2313 uint16_t nl; 2314 uint8_t iaid[4]; 2315 char buf[sizeof(iaid) * 3]; 2316 struct ipv6_addr *ap; 2317 struct if_ia *ifia; 2318 2319 if (l < sizeof(*m)) { 2320 /* Should be impossible with guards at packet in 2321 * and reading leases */ 2322 errno = EINVAL; 2323 return -1; 2324 } 2325 2326 ifo = ifp->options; 2327 i = e = 0; 2328 state = D6_STATE(ifp); 2329 TAILQ_FOREACH(ap, &state->addrs, next) { 2330 if (!(ap->flags & IPV6_AF_DELEGATED)) 2331 ap->flags |= IPV6_AF_STALE; 2332 } 2333 2334 d = (uint8_t *)m + sizeof(*m); 2335 l -= sizeof(*m); 2336 while (l > sizeof(o)) { 2337 memcpy(&o, d, sizeof(o)); 2338 o.len = ntohs(o.len); 2339 if (o.len > l || sizeof(o) + o.len > l) { 2340 errno = EINVAL; 2341 logerrx("%s: option overflow", ifp->name); 2342 break; 2343 } 2344 p = d + sizeof(o); 2345 d = p + o.len; 2346 l -= sizeof(o) + o.len; 2347 2348 o.code = ntohs(o.code); 2349 switch(o.code) { 2350 case D6_OPTION_IA_TA: 2351 nl = 4; 2352 break; 2353 case D6_OPTION_IA_NA: 2354 case D6_OPTION_IA_PD: 2355 nl = 12; 2356 break; 2357 default: 2358 continue; 2359 } 2360 if (o.len < nl) { 2361 errno = EINVAL; 2362 logerrx("%s: IA option truncated", ifp->name); 2363 continue; 2364 } 2365 2366 memcpy(&ia, p, nl); 2367 p += nl; 2368 o.len = (uint16_t)(o.len - nl); 2369 2370 for (j = 0; j < ifo->ia_len; j++) { 2371 ifia = &ifo->ia[j]; 2372 if (ifia->ia_type == o.code && 2373 memcmp(ifia->iaid, ia.iaid, sizeof(ia.iaid)) == 0) 2374 break; 2375 } 2376 if (j == ifo->ia_len && 2377 !(ifo->ia_len == 0 && ifp->ctx->options & DHCPCD_DUMPLEASE)) 2378 { 2379 logdebugx("%s: ignoring unrequested IAID %s", 2380 ifp->name, 2381 hwaddr_ntoa(ia.iaid, sizeof(ia.iaid), 2382 buf, sizeof(buf))); 2383 continue; 2384 } 2385 2386 if (o.code != D6_OPTION_IA_TA) { 2387 ia.t1 = ntohl(ia.t1); 2388 ia.t2 = ntohl(ia.t2); 2389 /* RFC 3315 22.4 */ 2390 if (ia.t2 > 0 && ia.t1 > ia.t2) { 2391 logwarnx("%s: IAID %s T1(%d) > T2(%d) from %s", 2392 ifp->name, 2393 hwaddr_ntoa(iaid, sizeof(iaid), buf, 2394 sizeof(buf)), 2395 ia.t1, ia.t2, sfrom); 2396 continue; 2397 } 2398 } else 2399 ia.t1 = ia.t2 = 0; /* appease gcc */ 2400 if ((error = dhcp6_checkstatusok(ifp, NULL, p, o.len)) != 0) { 2401 if (error == D6_STATUS_NOBINDING) 2402 state->has_no_binding = true; 2403 e = 1; 2404 continue; 2405 } 2406 if (o.code == D6_OPTION_IA_PD) { 2407 #ifndef SMALL 2408 if (dhcp6_findpd(ifp, ia.iaid, p, o.len, 2409 acquired) == 0) 2410 { 2411 logwarnx("%s: %s: DHCPv6 REPLY missing Prefix", 2412 ifp->name, sfrom); 2413 continue; 2414 } 2415 #endif 2416 } else { 2417 if (dhcp6_findna(ifp, o.code, ia.iaid, p, o.len, 2418 acquired) == 0) 2419 { 2420 logwarnx("%s: %s: DHCPv6 REPLY missing " 2421 "IA Address", 2422 ifp->name, sfrom); 2423 continue; 2424 } 2425 } 2426 if (o.code != D6_OPTION_IA_TA) { 2427 if (ia.t1 != 0 && 2428 (ia.t1 < state->renew || state->renew == 0)) 2429 state->renew = ia.t1; 2430 if (ia.t2 != 0 && 2431 (ia.t2 < state->rebind || state->rebind == 0)) 2432 state->rebind = ia.t2; 2433 } 2434 i++; 2435 } 2436 2437 if (i == 0 && e) 2438 return -1; 2439 return i; 2440 } 2441 2442 #ifndef SMALL 2443 static void 2444 dhcp6_deprecatedele(struct ipv6_addr *ia) 2445 { 2446 struct ipv6_addr *da, *dan, *dda; 2447 struct timespec now; 2448 struct dhcp6_state *state; 2449 2450 timespecclear(&now); 2451 TAILQ_FOREACH_SAFE(da, &ia->pd_pfxs, pd_next, dan) { 2452 if (ia->prefix_vltime == 0) { 2453 if (da->prefix_vltime != 0) 2454 da->prefix_vltime = 0; 2455 else 2456 continue; 2457 } else if (da->prefix_pltime != 0) 2458 da->prefix_pltime = 0; 2459 else 2460 continue; 2461 2462 if (ipv6_doaddr(da, &now) != -1) 2463 continue; 2464 2465 /* Delegation deleted, forget it. */ 2466 TAILQ_REMOVE(&ia->pd_pfxs, da, pd_next); 2467 2468 /* Delete it from the interface. */ 2469 state = D6_STATE(da->iface); 2470 TAILQ_FOREACH(dda, &state->addrs, next) { 2471 if (IN6_ARE_ADDR_EQUAL(&dda->addr, &da->addr)) 2472 break; 2473 } 2474 if (dda != NULL) { 2475 TAILQ_REMOVE(&state->addrs, dda, next); 2476 ipv6_freeaddr(dda); 2477 } 2478 } 2479 } 2480 #endif 2481 2482 static void 2483 dhcp6_deprecateaddrs(struct ipv6_addrhead *addrs) 2484 { 2485 struct ipv6_addr *ia, *ian; 2486 2487 TAILQ_FOREACH_SAFE(ia, addrs, next, ian) { 2488 if (ia->flags & IPV6_AF_EXTENDED) 2489 ; 2490 else if (ia->flags & IPV6_AF_STALE) { 2491 if (ia->prefix_vltime != 0) 2492 logdebugx("%s: %s: became stale", 2493 ia->iface->name, ia->saddr); 2494 /* Technically this violates RFC 8415 18.2.10.1, 2495 * but we need a mechanism to tell the kernel to 2496 * try and prefer other addresses. */ 2497 ia->prefix_pltime = 0; 2498 } else if (ia->prefix_vltime == 0) 2499 loginfox("%s: %s: no valid lifetime", 2500 ia->iface->name, ia->saddr); 2501 else 2502 continue; 2503 2504 #ifndef SMALL 2505 /* If we delegated from this prefix, deprecate or remove 2506 * the delegations. */ 2507 if (ia->flags & IPV6_AF_DELEGATEDPFX) 2508 dhcp6_deprecatedele(ia); 2509 #endif 2510 2511 if (ia->flags & IPV6_AF_REQUEST) { 2512 ia->prefix_vltime = ia->prefix_pltime = 0; 2513 eloop_q_timeout_delete(ia->iface->ctx->eloop, 2514 ELOOP_QUEUE_ALL, NULL, ia); 2515 continue; 2516 } 2517 TAILQ_REMOVE(addrs, ia, next); 2518 if (ia->flags & IPV6_AF_EXTENDED) 2519 ipv6_deleteaddr(ia); 2520 ipv6_freeaddr(ia); 2521 } 2522 } 2523 2524 static int 2525 dhcp6_validatelease(struct interface *ifp, 2526 struct dhcp6_message *m, size_t len, 2527 const char *sfrom, const struct timespec *acquired) 2528 { 2529 struct dhcp6_state *state; 2530 int nia, ok_errno; 2531 struct timespec aq; 2532 2533 if (len <= sizeof(*m)) { 2534 logerrx("%s: DHCPv6 lease truncated", ifp->name); 2535 return -1; 2536 } 2537 2538 state = D6_STATE(ifp); 2539 errno = 0; 2540 if (dhcp6_checkstatusok(ifp, m, NULL, len) != 0) 2541 return -1; 2542 ok_errno = errno; 2543 2544 state->renew = state->rebind = state->expire = 0; 2545 state->lowpl = ND6_INFINITE_LIFETIME; 2546 if (!acquired) { 2547 clock_gettime(CLOCK_MONOTONIC, &aq); 2548 acquired = &aq; 2549 } 2550 state->has_no_binding = false; 2551 nia = dhcp6_findia(ifp, m, len, sfrom, acquired); 2552 if (nia == 0) { 2553 if (state->state != DH6S_CONFIRM && ok_errno != 0) { 2554 logerrx("%s: no useable IA found in lease", ifp->name); 2555 return -1; 2556 } 2557 2558 /* We are confirming and have an OK, 2559 * so look for ia's in our old lease. 2560 * IA's must have existed here otherwise we would 2561 * have rejected it earlier. */ 2562 assert(state->new != NULL && state->new_len != 0); 2563 state->has_no_binding = false; 2564 nia = dhcp6_findia(ifp, state->new, state->new_len, 2565 sfrom, acquired); 2566 } 2567 return nia; 2568 } 2569 2570 static ssize_t 2571 dhcp6_readlease(struct interface *ifp, int validate) 2572 { 2573 union { 2574 struct dhcp6_message dhcp6; 2575 uint8_t buf[UDPLEN_MAX]; 2576 } buf; 2577 struct dhcp6_state *state; 2578 ssize_t bytes; 2579 int fd; 2580 time_t mtime, now; 2581 #ifdef AUTH 2582 uint8_t *o; 2583 uint16_t ol; 2584 #endif 2585 2586 state = D6_STATE(ifp); 2587 if (state->leasefile[0] == '\0') { 2588 logdebugx("reading standard input"); 2589 bytes = read(fileno(stdin), buf.buf, sizeof(buf.buf)); 2590 } else { 2591 logdebugx("%s: reading lease: %s", 2592 ifp->name, state->leasefile); 2593 bytes = dhcp_readfile(ifp->ctx, state->leasefile, 2594 buf.buf, sizeof(buf.buf)); 2595 } 2596 if (bytes == -1) 2597 goto ex; 2598 2599 if (ifp->ctx->options & DHCPCD_DUMPLEASE || state->leasefile[0] == '\0') 2600 goto out; 2601 2602 if (bytes == 0) 2603 goto ex; 2604 2605 /* If not validating IA's and if they have expired, 2606 * skip to the auth check. */ 2607 if (!validate) 2608 goto auth; 2609 2610 if (dhcp_filemtime(ifp->ctx, state->leasefile, &mtime) == -1) 2611 goto ex; 2612 clock_gettime(CLOCK_MONOTONIC, &state->acquired); 2613 if ((now = time(NULL)) == -1) 2614 goto ex; 2615 state->acquired.tv_sec -= now - mtime; 2616 2617 /* Check to see if the lease is still valid */ 2618 fd = dhcp6_validatelease(ifp, &buf.dhcp6, (size_t)bytes, NULL, 2619 &state->acquired); 2620 if (fd == -1) 2621 goto ex; 2622 2623 if (state->expire != ND6_INFINITE_LIFETIME && 2624 (time_t)state->expire < now - mtime && 2625 !(ifp->options->options & DHCPCD_LASTLEASE_EXTEND)) 2626 { 2627 logdebugx("%s: discarding expired lease", ifp->name); 2628 bytes = 0; 2629 goto ex; 2630 } 2631 2632 auth: 2633 #ifdef AUTH 2634 /* Authenticate the message */ 2635 o = dhcp6_findmoption(&buf.dhcp6, (size_t)bytes, D6_OPTION_AUTH, &ol); 2636 if (o) { 2637 if (dhcp_auth_validate(&state->auth, &ifp->options->auth, 2638 buf.buf, (size_t)bytes, 6, buf.dhcp6.type, o, ol) == NULL) 2639 { 2640 logerr("%s: authentication failed", ifp->name); 2641 bytes = 0; 2642 goto ex; 2643 } 2644 if (state->auth.token) 2645 logdebugx("%s: validated using 0x%08" PRIu32, 2646 ifp->name, state->auth.token->secretid); 2647 else 2648 loginfox("%s: accepted reconfigure key", ifp->name); 2649 } else if ((ifp->options->auth.options & DHCPCD_AUTH_SENDREQUIRE) == 2650 DHCPCD_AUTH_SENDREQUIRE) 2651 { 2652 logerrx("%s: authentication now required", ifp->name); 2653 goto ex; 2654 } 2655 #endif 2656 2657 out: 2658 free(state->new); 2659 state->new = malloc((size_t)bytes); 2660 if (state->new == NULL) { 2661 logerr(__func__); 2662 goto ex; 2663 } 2664 2665 memcpy(state->new, buf.buf, (size_t)bytes); 2666 state->new_len = (size_t)bytes; 2667 return bytes; 2668 2669 ex: 2670 dhcp6_freedrop_addrs(ifp, 0, NULL); 2671 dhcp_unlink(ifp->ctx, state->leasefile); 2672 free(state->new); 2673 state->new = NULL; 2674 state->new_len = 0; 2675 dhcp6_addrequestedaddrs(ifp); 2676 return bytes == 0 ? 0 : -1; 2677 } 2678 2679 static void 2680 dhcp6_startinit(struct interface *ifp) 2681 { 2682 struct dhcp6_state *state; 2683 ssize_t r; 2684 uint8_t has_ta, has_non_ta; 2685 size_t i; 2686 2687 state = D6_STATE(ifp); 2688 state->state = DH6S_INIT; 2689 state->expire = ND6_INFINITE_LIFETIME; 2690 state->lowpl = ND6_INFINITE_LIFETIME; 2691 2692 dhcp6_addrequestedaddrs(ifp); 2693 has_ta = has_non_ta = 0; 2694 for (i = 0; i < ifp->options->ia_len; i++) { 2695 switch (ifp->options->ia[i].ia_type) { 2696 case D6_OPTION_IA_TA: 2697 has_ta = 1; 2698 break; 2699 default: 2700 has_non_ta = 1; 2701 } 2702 } 2703 2704 if (!(ifp->ctx->options & DHCPCD_TEST) && 2705 !(has_ta && !has_non_ta) && 2706 ifp->options->reboot != 0) 2707 { 2708 r = dhcp6_readlease(ifp, 1); 2709 if (r == -1) { 2710 if (errno != ENOENT && errno != ESRCH) 2711 logerr("%s: %s", __func__, state->leasefile); 2712 } else if (r != 0 && 2713 !(ifp->options->options & DHCPCD_ANONYMOUS)) 2714 { 2715 /* RFC 3633 section 12.1 */ 2716 #ifndef SMALL 2717 if (dhcp6_hasprefixdelegation(ifp)) 2718 dhcp6_startrebind(ifp); 2719 else 2720 #endif 2721 dhcp6_startconfirm(ifp); 2722 return; 2723 } 2724 } 2725 dhcp6_startdiscoinform(ifp); 2726 } 2727 2728 #ifndef SMALL 2729 static struct ipv6_addr * 2730 dhcp6_ifdelegateaddr(struct interface *ifp, struct ipv6_addr *prefix, 2731 const struct if_sla *sla, struct if_ia *if_ia) 2732 { 2733 struct dhcp6_state *state; 2734 struct in6_addr addr, daddr; 2735 struct ipv6_addr *ia; 2736 int pfxlen, dadcounter; 2737 uint64_t vl; 2738 2739 /* RFC6603 Section 4.2 */ 2740 if (strcmp(ifp->name, prefix->iface->name) == 0) { 2741 if (prefix->prefix_exclude_len == 0) { 2742 /* Don't spam the log automatically */ 2743 if (sla != NULL) 2744 logwarnx("%s: DHCPv6 server does not support " 2745 "OPTION_PD_EXCLUDE", 2746 ifp->name); 2747 return NULL; 2748 } 2749 pfxlen = prefix->prefix_exclude_len; 2750 memcpy(&addr, &prefix->prefix_exclude, sizeof(addr)); 2751 } else if ((pfxlen = dhcp6_delegateaddr(&addr, ifp, prefix, 2752 sla, if_ia)) == -1) 2753 return NULL; 2754 2755 if (sla != NULL && fls64(sla->suffix) > 128 - pfxlen) { 2756 logerrx("%s: suffix %" PRIu64 " + prefix_len %d > 128", 2757 ifp->name, sla->suffix, pfxlen); 2758 return NULL; 2759 } 2760 2761 /* Add our suffix */ 2762 if (sla != NULL && sla->suffix != 0) { 2763 daddr = addr; 2764 vl = be64dec(addr.s6_addr + 8); 2765 vl |= sla->suffix; 2766 be64enc(daddr.s6_addr + 8, vl); 2767 } else { 2768 dadcounter = ipv6_makeaddr(&daddr, ifp, &addr, pfxlen, 0); 2769 if (dadcounter == -1) { 2770 logerrx("%s: error adding slaac to prefix_len %d", 2771 ifp->name, pfxlen); 2772 return NULL; 2773 } 2774 } 2775 2776 /* Find an existing address */ 2777 state = D6_STATE(ifp); 2778 TAILQ_FOREACH(ia, &state->addrs, next) { 2779 if (IN6_ARE_ADDR_EQUAL(&ia->addr, &daddr)) 2780 break; 2781 } 2782 if (ia == NULL) { 2783 ia = ipv6_newaddr(ifp, &daddr, (uint8_t)pfxlen, IPV6_AF_ONLINK); 2784 if (ia == NULL) 2785 return NULL; 2786 ia->dadcallback = dhcp6_dadcallback; 2787 memcpy(&ia->iaid, &prefix->iaid, sizeof(ia->iaid)); 2788 ia->created = prefix->acquired; 2789 2790 TAILQ_INSERT_TAIL(&state->addrs, ia, next); 2791 TAILQ_INSERT_TAIL(&prefix->pd_pfxs, ia, pd_next); 2792 } 2793 ia->delegating_prefix = prefix; 2794 ia->prefix = addr; 2795 ia->prefix_len = (uint8_t)pfxlen; 2796 ia->acquired = prefix->acquired; 2797 ia->prefix_pltime = prefix->prefix_pltime; 2798 ia->prefix_vltime = prefix->prefix_vltime; 2799 2800 /* If the prefix length hasn't changed, 2801 * don't install a reject route. */ 2802 if (prefix->prefix_len == pfxlen) 2803 prefix->flags |= IPV6_AF_NOREJECT; 2804 else 2805 prefix->flags &= ~IPV6_AF_NOREJECT; 2806 2807 return ia; 2808 } 2809 #endif 2810 2811 static void 2812 dhcp6_script_try_run(struct interface *ifp, int delegated) 2813 { 2814 struct dhcp6_state *state; 2815 struct ipv6_addr *ap; 2816 int completed; 2817 2818 state = D6_STATE(ifp); 2819 completed = 1; 2820 /* If all addresses have completed DAD run the script */ 2821 TAILQ_FOREACH(ap, &state->addrs, next) { 2822 if (!(ap->flags & IPV6_AF_ADDED)) 2823 continue; 2824 if (ap->flags & IPV6_AF_ONLINK) { 2825 if (!(ap->flags & IPV6_AF_DADCOMPLETED) && 2826 ipv6_iffindaddr(ap->iface, &ap->addr, 2827 IN6_IFF_TENTATIVE)) 2828 ap->flags |= IPV6_AF_DADCOMPLETED; 2829 if ((ap->flags & IPV6_AF_DADCOMPLETED) == 0 2830 #ifndef SMALL 2831 && ((delegated && ap->delegating_prefix) || 2832 (!delegated && !ap->delegating_prefix)) 2833 #endif 2834 ) 2835 { 2836 completed = 0; 2837 break; 2838 } 2839 } 2840 } 2841 if (completed) { 2842 script_runreason(ifp, delegated ? "DELEGATED6" : state->reason); 2843 if (!delegated) 2844 dhcpcd_daemonise(ifp->ctx); 2845 } else 2846 logdebugx("%s: waiting for DHCPv6 DAD to complete", ifp->name); 2847 } 2848 2849 #ifdef SMALL 2850 size_t 2851 dhcp6_find_delegates(__unused struct interface *ifp) 2852 { 2853 2854 return 0; 2855 } 2856 #else 2857 static void 2858 dhcp6_delegate_prefix(struct interface *ifp) 2859 { 2860 struct if_options *ifo; 2861 struct dhcp6_state *state; 2862 struct ipv6_addr *ap; 2863 size_t i, j, k; 2864 struct if_ia *ia; 2865 struct if_sla *sla; 2866 struct interface *ifd; 2867 bool carrier_warned; 2868 2869 ifo = ifp->options; 2870 state = D6_STATE(ifp); 2871 2872 /* Clear the logged flag. */ 2873 TAILQ_FOREACH(ap, &state->addrs, next) { 2874 ap->flags &= ~IPV6_AF_DELEGATEDLOG; 2875 } 2876 2877 TAILQ_FOREACH(ifd, ifp->ctx->ifaces, next) { 2878 if (!ifd->active) 2879 continue; 2880 k = 0; 2881 carrier_warned = false; 2882 TAILQ_FOREACH(ap, &state->addrs, next) { 2883 if (!(ap->flags & IPV6_AF_DELEGATEDPFX)) 2884 continue; 2885 if (!(ap->flags & IPV6_AF_DELEGATEDLOG)) { 2886 int loglevel; 2887 2888 if (ap->flags & IPV6_AF_NEW) 2889 loglevel = LOG_INFO; 2890 else 2891 loglevel = LOG_DEBUG; 2892 /* We only want to log this the once as we loop 2893 * through many interfaces first. */ 2894 ap->flags |= IPV6_AF_DELEGATEDLOG; 2895 logmessage(loglevel, "%s: delegated prefix %s", 2896 ifp->name, ap->saddr); 2897 ap->flags &= ~IPV6_AF_NEW; 2898 } 2899 for (i = 0; i < ifo->ia_len; i++) { 2900 ia = &ifo->ia[i]; 2901 if (ia->ia_type != D6_OPTION_IA_PD) 2902 continue; 2903 if (memcmp(ia->iaid, ap->iaid, 2904 sizeof(ia->iaid))) 2905 continue; 2906 if (ia->sla_len == 0) { 2907 /* no SLA configured, so lets 2908 * automate it */ 2909 if (!if_is_link_up(ifd)) { 2910 logdebugx( 2911 "%s: has no carrier, cannot" 2912 " delegate addresses", 2913 ifd->name); 2914 carrier_warned = true; 2915 break; 2916 } 2917 if (dhcp6_ifdelegateaddr(ifd, ap, 2918 NULL, ia)) 2919 k++; 2920 } 2921 for (j = 0; j < ia->sla_len; j++) { 2922 sla = &ia->sla[j]; 2923 if (strcmp(ifd->name, sla->ifname)) 2924 continue; 2925 if (!if_is_link_up(ifd)) { 2926 logdebugx( 2927 "%s: has no carrier, cannot" 2928 " delegate addresses", 2929 ifd->name); 2930 carrier_warned = true; 2931 break; 2932 } 2933 if (dhcp6_ifdelegateaddr(ifd, ap, 2934 sla, ia)) 2935 k++; 2936 } 2937 if (carrier_warned) 2938 break; 2939 } 2940 if (carrier_warned) 2941 break; 2942 } 2943 if (k && !carrier_warned) { 2944 struct dhcp6_state *s = D6_STATE(ifd); 2945 2946 ipv6_addaddrs(&s->addrs); 2947 dhcp6_script_try_run(ifd, 1); 2948 } 2949 } 2950 2951 /* Now all addresses have been added, rebuild the routing table. */ 2952 rt_build(ifp->ctx, AF_INET6); 2953 } 2954 2955 static void 2956 dhcp6_find_delegates1(void *arg) 2957 { 2958 2959 dhcp6_find_delegates(arg); 2960 } 2961 2962 size_t 2963 dhcp6_find_delegates(struct interface *ifp) 2964 { 2965 struct if_options *ifo; 2966 struct dhcp6_state *state; 2967 struct ipv6_addr *ap; 2968 size_t i, j, k; 2969 struct if_ia *ia; 2970 struct if_sla *sla; 2971 struct interface *ifd; 2972 2973 k = 0; 2974 TAILQ_FOREACH(ifd, ifp->ctx->ifaces, next) { 2975 ifo = ifd->options; 2976 state = D6_STATE(ifd); 2977 if (state == NULL || state->state != DH6S_BOUND) 2978 continue; 2979 TAILQ_FOREACH(ap, &state->addrs, next) { 2980 if (!(ap->flags & IPV6_AF_DELEGATEDPFX)) 2981 continue; 2982 for (i = 0; i < ifo->ia_len; i++) { 2983 ia = &ifo->ia[i]; 2984 if (ia->ia_type != D6_OPTION_IA_PD) 2985 continue; 2986 if (memcmp(ia->iaid, ap->iaid, 2987 sizeof(ia->iaid))) 2988 continue; 2989 for (j = 0; j < ia->sla_len; j++) { 2990 sla = &ia->sla[j]; 2991 if (strcmp(ifp->name, sla->ifname)) 2992 continue; 2993 if (ipv6_linklocal(ifp) == NULL) { 2994 logdebugx( 2995 "%s: delaying adding" 2996 " delegated addresses for" 2997 " LL address", 2998 ifp->name); 2999 ipv6_addlinklocalcallback(ifp, 3000 dhcp6_find_delegates1, ifp); 3001 return 1; 3002 } 3003 if (dhcp6_ifdelegateaddr(ifp, ap, 3004 sla, ia)) 3005 k++; 3006 } 3007 } 3008 } 3009 } 3010 3011 if (k) { 3012 loginfox("%s: adding delegated prefixes", ifp->name); 3013 state = D6_STATE(ifp); 3014 state->state = DH6S_DELEGATED; 3015 ipv6_addaddrs(&state->addrs); 3016 rt_build(ifp->ctx, AF_INET6); 3017 dhcp6_script_try_run(ifp, 1); 3018 } 3019 return k; 3020 } 3021 #endif 3022 3023 static void 3024 dhcp6_bind(struct interface *ifp, const char *op, const char *sfrom) 3025 { 3026 struct dhcp6_state *state = D6_STATE(ifp); 3027 bool timedout = (op == NULL), has_new = false, confirmed; 3028 struct ipv6_addr *ia; 3029 int loglevel; 3030 struct timespec now; 3031 3032 TAILQ_FOREACH(ia, &state->addrs, next) { 3033 if (ia->flags & IPV6_AF_NEW) { 3034 has_new = true; 3035 break; 3036 } 3037 } 3038 loglevel = has_new || state->state != DH6S_RENEW ? LOG_INFO : LOG_DEBUG; 3039 if (!timedout) { 3040 logmessage(loglevel, "%s: %s received from %s", 3041 ifp->name, op, sfrom); 3042 #ifndef SMALL 3043 /* If we delegated from an unconfirmed lease we MUST drop 3044 * them now. Hopefully we have new delegations. */ 3045 if (state->reason != NULL && 3046 strcmp(state->reason, "TIMEOUT6") == 0) 3047 dhcp6_delete_delegates(ifp); 3048 #endif 3049 state->reason = NULL; 3050 } else 3051 state->reason = "TIMEOUT6"; 3052 3053 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 3054 clock_gettime(CLOCK_MONOTONIC, &now); 3055 3056 switch(state->state) { 3057 case DH6S_INFORM: 3058 { 3059 struct dhcp6_option *o; 3060 uint16_t ol; 3061 3062 if (state->reason == NULL) 3063 state->reason = "INFORM6"; 3064 o = dhcp6_findmoption(state->new, state->new_len, 3065 D6_OPTION_INFO_REFRESH_TIME, &ol); 3066 if (o == NULL || ol != sizeof(uint32_t)) 3067 state->renew = IRT_DEFAULT; 3068 else { 3069 memcpy(&state->renew, o, ol); 3070 state->renew = ntohl(state->renew); 3071 if (state->renew < IRT_MINIMUM) 3072 state->renew = IRT_MINIMUM; 3073 } 3074 state->rebind = 0; 3075 state->expire = ND6_INFINITE_LIFETIME; 3076 state->lowpl = ND6_INFINITE_LIFETIME; 3077 } 3078 break; 3079 3080 case DH6S_REQUEST: 3081 if (state->reason == NULL) 3082 state->reason = "BOUND6"; 3083 /* FALLTHROUGH */ 3084 case DH6S_RENEW: 3085 if (state->reason == NULL) 3086 state->reason = "RENEW6"; 3087 /* FALLTHROUGH */ 3088 case DH6S_REBIND: 3089 if (state->reason == NULL) 3090 state->reason = "REBIND6"; 3091 /* FALLTHROUGH */ 3092 case DH6S_CONFIRM: 3093 if (state->reason == NULL) 3094 state->reason = "REBOOT6"; 3095 if (state->renew != 0) { 3096 bool all_expired = true; 3097 3098 TAILQ_FOREACH(ia, &state->addrs, next) { 3099 if (ia->flags & IPV6_AF_STALE) 3100 continue; 3101 if (!(state->renew == ND6_INFINITE_LIFETIME 3102 && ia->prefix_vltime == ND6_INFINITE_LIFETIME) 3103 && ia->prefix_vltime != 0 3104 && ia->prefix_vltime <= state->renew) 3105 logwarnx( 3106 "%s: %s will expire before renewal", 3107 ifp->name, ia->saddr); 3108 else 3109 all_expired = false; 3110 } 3111 if (all_expired) { 3112 /* All address's vltime happens at or before 3113 * the configured T1 in the IA. 3114 * This is a badly configured server and we 3115 * have to use our own notion of what 3116 * T1 and T2 should be as a result. 3117 * 3118 * Doing this violates RFC 3315 22.4: 3119 * In a message sent by a server to a client, 3120 * the client MUST use the values in the T1 3121 * and T2 fields for the T1 and T2 parameters, 3122 * unless those values in those fields are 0. 3123 */ 3124 logwarnx("%s: ignoring T1 %"PRIu32 3125 " due to address expiry", 3126 ifp->name, state->renew); 3127 state->renew = state->rebind = 0; 3128 } 3129 } 3130 if (state->renew == 0 && state->lowpl != ND6_INFINITE_LIFETIME) 3131 state->renew = (uint32_t)(state->lowpl * 0.5); 3132 if (state->rebind == 0 && state->lowpl != ND6_INFINITE_LIFETIME) 3133 state->rebind = (uint32_t)(state->lowpl * 0.8); 3134 break; 3135 default: 3136 state->reason = "UNKNOWN6"; 3137 break; 3138 } 3139 3140 if (state->state != DH6S_CONFIRM && !timedout) { 3141 state->acquired = now; 3142 free(state->old); 3143 state->old = state->new; 3144 state->old_len = state->new_len; 3145 state->new = state->recv; 3146 state->new_len = state->recv_len; 3147 state->recv = NULL; 3148 state->recv_len = 0; 3149 confirmed = false; 3150 } else { 3151 /* Reduce timers based on when we got the lease. */ 3152 uint32_t elapsed; 3153 3154 elapsed = (uint32_t)eloop_timespec_diff(&now, 3155 &state->acquired, NULL); 3156 if (state->renew && state->renew != ND6_INFINITE_LIFETIME) { 3157 if (state->renew > elapsed) 3158 state->renew -= elapsed; 3159 else 3160 state->renew = 0; 3161 } 3162 if (state->rebind && state->rebind != ND6_INFINITE_LIFETIME) { 3163 if (state->rebind > elapsed) 3164 state->rebind -= elapsed; 3165 else 3166 state->rebind = 0; 3167 } 3168 if (state->expire && state->expire != ND6_INFINITE_LIFETIME) { 3169 if (state->expire > elapsed) 3170 state->expire -= elapsed; 3171 else 3172 state->expire = 0; 3173 } 3174 confirmed = true; 3175 } 3176 3177 if (ifp->ctx->options & DHCPCD_TEST) 3178 script_runreason(ifp, "TEST"); 3179 else { 3180 if (state->state == DH6S_INFORM) 3181 state->state = DH6S_INFORMED; 3182 else 3183 state->state = DH6S_BOUND; 3184 state->failed = false; 3185 3186 if (state->renew && state->renew != ND6_INFINITE_LIFETIME) 3187 eloop_timeout_add_sec(ifp->ctx->eloop, 3188 state->renew, 3189 state->state == DH6S_INFORMED ? 3190 dhcp6_startinform : dhcp6_startrenew, ifp); 3191 if (state->rebind && state->rebind != ND6_INFINITE_LIFETIME) 3192 eloop_timeout_add_sec(ifp->ctx->eloop, 3193 state->rebind, dhcp6_startrebind, ifp); 3194 if (state->expire != ND6_INFINITE_LIFETIME) 3195 eloop_timeout_add_sec(ifp->ctx->eloop, 3196 state->expire, dhcp6_startexpire, ifp); 3197 3198 ipv6_addaddrs(&state->addrs); 3199 if (!timedout) 3200 dhcp6_deprecateaddrs(&state->addrs); 3201 3202 if (state->state == DH6S_INFORMED) 3203 logmessage(loglevel, "%s: refresh in %"PRIu32" seconds", 3204 ifp->name, state->renew); 3205 else if (state->renew == ND6_INFINITE_LIFETIME) 3206 logmessage(loglevel, "%s: leased for infinity", 3207 ifp->name); 3208 else if (state->renew || state->rebind) 3209 logmessage(loglevel, "%s: renew in %"PRIu32", " 3210 "rebind in %"PRIu32", " 3211 "expire in %"PRIu32" seconds", 3212 ifp->name, 3213 state->renew, state->rebind, state->expire); 3214 else if (state->expire == 0) 3215 logmessage(loglevel, "%s: will expire", ifp->name); 3216 else 3217 logmessage(loglevel, "%s: expire in %"PRIu32" seconds", 3218 ifp->name, state->expire); 3219 rt_build(ifp->ctx, AF_INET6); 3220 if (!confirmed && !timedout) { 3221 logdebugx("%s: writing lease: %s", 3222 ifp->name, state->leasefile); 3223 if (dhcp_writefile(ifp->ctx, state->leasefile, 0640, 3224 state->new, state->new_len) == -1) 3225 logerr("dhcp_writefile: %s",state->leasefile); 3226 } 3227 #ifndef SMALL 3228 dhcp6_delegate_prefix(ifp); 3229 #endif 3230 dhcp6_script_try_run(ifp, 0); 3231 } 3232 3233 if (ifp->ctx->options & DHCPCD_TEST || 3234 (ifp->options->options & DHCPCD_INFORM && 3235 !(ifp->ctx->options & DHCPCD_MASTER))) 3236 { 3237 eloop_exit(ifp->ctx->eloop, EXIT_SUCCESS); 3238 } 3239 } 3240 3241 static void 3242 dhcp6_recvif(struct interface *ifp, const char *sfrom, 3243 struct dhcp6_message *r, size_t len) 3244 { 3245 struct dhcpcd_ctx *ctx; 3246 size_t i; 3247 const char *op; 3248 struct dhcp6_state *state; 3249 uint8_t *o; 3250 uint16_t ol; 3251 const struct dhcp_opt *opt; 3252 const struct if_options *ifo; 3253 bool valid_op; 3254 #ifdef AUTH 3255 uint8_t *auth; 3256 uint16_t auth_len; 3257 #endif 3258 3259 ctx = ifp->ctx; 3260 state = D6_STATE(ifp); 3261 if (state == NULL || state->send == NULL) { 3262 logdebugx("%s: DHCPv6 reply received but not running", 3263 ifp->name); 3264 return; 3265 } 3266 3267 /* We're already bound and this message is for another machine */ 3268 /* XXX DELEGATED? */ 3269 if (r->type != DHCP6_RECONFIGURE && 3270 (state->state == DH6S_BOUND || state->state == DH6S_INFORMED)) 3271 { 3272 logdebugx("%s: DHCPv6 reply received but already bound", 3273 ifp->name); 3274 return; 3275 } 3276 3277 if (dhcp6_findmoption(r, len, D6_OPTION_SERVERID, NULL) == NULL) { 3278 logdebugx("%s: no DHCPv6 server ID from %s", ifp->name, sfrom); 3279 return; 3280 } 3281 3282 ifo = ifp->options; 3283 for (i = 0, opt = ctx->dhcp6_opts; 3284 i < ctx->dhcp6_opts_len; 3285 i++, opt++) 3286 { 3287 if (has_option_mask(ifo->requiremask6, opt->option) && 3288 !dhcp6_findmoption(r, len, (uint16_t)opt->option, NULL)) 3289 { 3290 logwarnx("%s: reject DHCPv6 (no option %s) from %s", 3291 ifp->name, opt->var, sfrom); 3292 return; 3293 } 3294 if (has_option_mask(ifo->rejectmask6, opt->option) && 3295 dhcp6_findmoption(r, len, (uint16_t)opt->option, NULL)) 3296 { 3297 logwarnx("%s: reject DHCPv6 (option %s) from %s", 3298 ifp->name, opt->var, sfrom); 3299 return; 3300 } 3301 } 3302 3303 #ifdef AUTH 3304 /* Authenticate the message */ 3305 auth = dhcp6_findmoption(r, len, D6_OPTION_AUTH, &auth_len); 3306 if (auth != NULL) { 3307 if (dhcp_auth_validate(&state->auth, &ifo->auth, 3308 (uint8_t *)r, len, 6, r->type, auth, auth_len) == NULL) 3309 { 3310 logerr("%s: authentication failed from %s", 3311 ifp->name, sfrom); 3312 return; 3313 } 3314 if (state->auth.token) 3315 logdebugx("%s: validated using 0x%08" PRIu32, 3316 ifp->name, state->auth.token->secretid); 3317 else 3318 loginfox("%s: accepted reconfigure key", ifp->name); 3319 } else if (ifo->auth.options & DHCPCD_AUTH_SEND) { 3320 if (ifo->auth.options & DHCPCD_AUTH_REQUIRE) { 3321 logerrx("%s: no authentication from %s", 3322 ifp->name, sfrom); 3323 return; 3324 } 3325 logwarnx("%s: no authentication from %s", ifp->name, sfrom); 3326 } 3327 #endif 3328 3329 op = dhcp6_get_op(r->type); 3330 valid_op = op != NULL; 3331 switch(r->type) { 3332 case DHCP6_REPLY: 3333 switch(state->state) { 3334 case DH6S_INFORM: 3335 if (dhcp6_checkstatusok(ifp, r, NULL, len) != 0) 3336 return; 3337 break; 3338 case DH6S_CONFIRM: 3339 if (dhcp6_validatelease(ifp, r, len, sfrom, NULL) == -1) 3340 { 3341 dhcp6_startdiscoinform(ifp); 3342 return; 3343 } 3344 break; 3345 case DH6S_DISCOVER: 3346 /* Only accept REPLY in DISCOVER for RAPID_COMMIT. 3347 * Normally we get an ADVERTISE for a DISCOVER. */ 3348 if (!has_option_mask(ifo->requestmask6, 3349 D6_OPTION_RAPID_COMMIT) || 3350 !dhcp6_findmoption(r, len, D6_OPTION_RAPID_COMMIT, 3351 NULL)) 3352 { 3353 valid_op = false; 3354 break; 3355 } 3356 /* Validate lease before setting state to REQUEST. */ 3357 /* FALLTHROUGH */ 3358 case DH6S_REQUEST: /* FALLTHROUGH */ 3359 case DH6S_RENEW: /* FALLTHROUGH */ 3360 case DH6S_REBIND: 3361 if (dhcp6_validatelease(ifp, r, len, sfrom, NULL) == -1) 3362 { 3363 /* 3364 * If we can't use the lease, fallback to 3365 * DISCOVER and try and get a new one. 3366 * 3367 * This is needed become some servers 3368 * renumber the prefix or address 3369 * and deny the current one before it expires 3370 * rather than sending it back with a zero 3371 * lifetime along with the new prefix or 3372 * address to use. 3373 * This behavior is wrong, but moving to the 3374 * DISCOVER phase works around it. 3375 * 3376 * The currently held lease is still valid 3377 * until a new one is found. 3378 */ 3379 if (state->state != DH6S_DISCOVER) 3380 dhcp6_startdiscoinform(ifp); 3381 return; 3382 } 3383 /* RFC8415 18.2.10.1 */ 3384 if ((state->state == DH6S_RENEW || 3385 state->state == DH6S_REBIND) && 3386 state->has_no_binding) 3387 { 3388 dhcp6_startrequest(ifp); 3389 return; 3390 } 3391 if (state->state == DH6S_DISCOVER) 3392 state->state = DH6S_REQUEST; 3393 break; 3394 case DH6S_DECLINE: 3395 /* This isnt really a failure, but an 3396 * acknowledgement of one. */ 3397 loginfox("%s: %s acknowledged DECLINE6", 3398 ifp->name, sfrom); 3399 dhcp6_fail(ifp); 3400 return; 3401 default: 3402 valid_op = false; 3403 break; 3404 } 3405 break; 3406 case DHCP6_ADVERTISE: 3407 if (state->state != DH6S_DISCOVER) { 3408 valid_op = false; 3409 break; 3410 } 3411 /* RFC7083 */ 3412 o = dhcp6_findmoption(r, len, D6_OPTION_SOL_MAX_RT, &ol); 3413 if (o && ol == sizeof(uint32_t)) { 3414 uint32_t max_rt; 3415 3416 memcpy(&max_rt, o, sizeof(max_rt)); 3417 max_rt = ntohl(max_rt); 3418 if (max_rt >= 60 && max_rt <= 86400) { 3419 logdebugx("%s: SOL_MAX_RT %llu -> %u", 3420 ifp->name, 3421 (unsigned long long)state->sol_max_rt, 3422 max_rt); 3423 state->sol_max_rt = max_rt; 3424 } else 3425 logerr("%s: invalid SOL_MAX_RT %u", 3426 ifp->name, max_rt); 3427 } 3428 o = dhcp6_findmoption(r, len, D6_OPTION_INF_MAX_RT, &ol); 3429 if (o && ol == sizeof(uint32_t)) { 3430 uint32_t max_rt; 3431 3432 memcpy(&max_rt, o, sizeof(max_rt)); 3433 max_rt = ntohl(max_rt); 3434 if (max_rt >= 60 && max_rt <= 86400) { 3435 logdebugx("%s: INF_MAX_RT %llu -> %u", 3436 ifp->name, 3437 (unsigned long long)state->inf_max_rt, 3438 max_rt); 3439 state->inf_max_rt = max_rt; 3440 } else 3441 logerrx("%s: invalid INF_MAX_RT %u", 3442 ifp->name, max_rt); 3443 } 3444 if (dhcp6_validatelease(ifp, r, len, sfrom, NULL) == -1) 3445 return; 3446 break; 3447 case DHCP6_RECONFIGURE: 3448 #ifdef AUTH 3449 if (auth == NULL) { 3450 #endif 3451 logerrx("%s: unauthenticated %s from %s", 3452 ifp->name, op, sfrom); 3453 if (ifo->auth.options & DHCPCD_AUTH_REQUIRE) 3454 return; 3455 #ifdef AUTH 3456 } 3457 loginfox("%s: %s from %s", ifp->name, op, sfrom); 3458 o = dhcp6_findmoption(r, len, D6_OPTION_RECONF_MSG, &ol); 3459 if (o == NULL) { 3460 logerrx("%s: missing Reconfigure Message option", 3461 ifp->name); 3462 return; 3463 } 3464 if (ol != 1) { 3465 logerrx("%s: missing Reconfigure Message type", 3466 ifp->name); 3467 return; 3468 } 3469 switch(*o) { 3470 case DHCP6_RENEW: 3471 if (state->state != DH6S_BOUND) { 3472 logerrx("%s: not bound, ignoring %s", 3473 ifp->name, op); 3474 return; 3475 } 3476 dhcp6_startrenew(ifp); 3477 break; 3478 case DHCP6_INFORMATION_REQ: 3479 if (state->state != DH6S_INFORMED) { 3480 logerrx("%s: not informed, ignoring %s", 3481 ifp->name, op); 3482 return; 3483 } 3484 eloop_timeout_delete(ifp->ctx->eloop, 3485 dhcp6_sendinform, ifp); 3486 dhcp6_startinform(ifp); 3487 break; 3488 default: 3489 logerr("%s: unsupported %s type %d", 3490 ifp->name, op, *o); 3491 break; 3492 } 3493 return; 3494 #else 3495 break; 3496 #endif 3497 default: 3498 logerrx("%s: invalid DHCP6 type %s (%d)", 3499 ifp->name, op, r->type); 3500 return; 3501 } 3502 if (!valid_op) { 3503 logwarnx("%s: invalid state for DHCP6 type %s (%d)", 3504 ifp->name, op, r->type); 3505 return; 3506 } 3507 3508 if (state->recv_len < (size_t)len) { 3509 free(state->recv); 3510 state->recv = malloc(len); 3511 if (state->recv == NULL) { 3512 logerr(__func__); 3513 return; 3514 } 3515 } 3516 memcpy(state->recv, r, len); 3517 state->recv_len = len; 3518 3519 if (r->type == DHCP6_ADVERTISE) { 3520 struct ipv6_addr *ia; 3521 3522 if (state->state == DH6S_REQUEST) /* rapid commit */ 3523 goto bind; 3524 TAILQ_FOREACH(ia, &state->addrs, next) { 3525 if (!(ia->flags & (IPV6_AF_STALE | IPV6_AF_REQUEST))) 3526 break; 3527 } 3528 if (ia == NULL) 3529 ia = TAILQ_FIRST(&state->addrs); 3530 if (ia == NULL) 3531 loginfox("%s: ADV (no address) from %s", 3532 ifp->name, sfrom); 3533 else 3534 loginfox("%s: ADV %s from %s", 3535 ifp->name, ia->saddr, sfrom); 3536 dhcp6_startrequest(ifp); 3537 return; 3538 } 3539 3540 bind: 3541 dhcp6_bind(ifp, op, sfrom); 3542 } 3543 3544 void 3545 dhcp6_recvmsg(struct dhcpcd_ctx *ctx, struct msghdr *msg, struct ipv6_addr *ia) 3546 { 3547 struct sockaddr_in6 *from = msg->msg_name; 3548 size_t len = msg->msg_iov[0].iov_len; 3549 char sfrom[INET6_ADDRSTRLEN]; 3550 struct interface *ifp; 3551 struct dhcp6_message *r; 3552 const struct dhcp6_state *state; 3553 uint8_t *o; 3554 uint16_t ol; 3555 3556 inet_ntop(AF_INET6, &from->sin6_addr, sfrom, sizeof(sfrom)); 3557 if (len < sizeof(struct dhcp6_message)) { 3558 logerrx("DHCPv6 packet too short from %s", sfrom); 3559 return; 3560 } 3561 3562 if (ia != NULL) 3563 ifp = ia->iface; 3564 else { 3565 ifp = if_findifpfromcmsg(ctx, msg, NULL); 3566 if (ifp == NULL) { 3567 logerr(__func__); 3568 return; 3569 } 3570 } 3571 3572 r = (struct dhcp6_message *)msg->msg_iov[0].iov_base; 3573 3574 uint8_t duid[DUID_LEN], *dp; 3575 size_t duid_len; 3576 o = dhcp6_findmoption(r, len, D6_OPTION_CLIENTID, &ol); 3577 if (ifp->options->options & DHCPCD_ANONYMOUS) { 3578 duid_len = duid_make(duid, ifp, DUID_LL); 3579 dp = duid; 3580 } else { 3581 duid_len = ctx->duid_len; 3582 dp = ctx->duid; 3583 } 3584 if (o == NULL || ol != duid_len || memcmp(o, dp, ol) != 0) { 3585 logdebugx("%s: incorrect client ID from %s", 3586 ifp->name, sfrom); 3587 return; 3588 } 3589 3590 if (dhcp6_findmoption(r, len, D6_OPTION_SERVERID, NULL) == NULL) { 3591 logdebugx("%s: no DHCPv6 server ID from %s", 3592 ifp->name, sfrom); 3593 return; 3594 } 3595 3596 if (r->type == DHCP6_RECONFIGURE) { 3597 if (!IN6_IS_ADDR_LINKLOCAL(&from->sin6_addr)) { 3598 logerrx("%s: RECONFIGURE6 recv from %s, not LL", 3599 ifp->name, sfrom); 3600 return; 3601 } 3602 goto recvif; 3603 } 3604 3605 state = D6_CSTATE(ifp); 3606 if (state == NULL || 3607 r->xid[0] != state->send->xid[0] || 3608 r->xid[1] != state->send->xid[1] || 3609 r->xid[2] != state->send->xid[2]) 3610 { 3611 struct interface *ifp1; 3612 const struct dhcp6_state *state1; 3613 3614 /* Find an interface with a matching xid. */ 3615 TAILQ_FOREACH(ifp1, ctx->ifaces, next) { 3616 state1 = D6_CSTATE(ifp1); 3617 if (state1 == NULL || state1->send == NULL) 3618 continue; 3619 if (r->xid[0] == state1->send->xid[0] && 3620 r->xid[1] == state1->send->xid[1] && 3621 r->xid[2] == state1->send->xid[2]) 3622 break; 3623 } 3624 3625 if (ifp1 == NULL) { 3626 if (state != NULL) 3627 logdebugx("%s: wrong xid 0x%02x%02x%02x" 3628 " (expecting 0x%02x%02x%02x) from %s", 3629 ifp->name, 3630 r->xid[0], r->xid[1], r->xid[2], 3631 state->send->xid[0], 3632 state->send->xid[1], 3633 state->send->xid[2], 3634 sfrom); 3635 return; 3636 } 3637 logdebugx("%s: redirecting DHCP6 message to %s", 3638 ifp->name, ifp1->name); 3639 ifp = ifp1; 3640 } 3641 3642 #if 0 3643 /* 3644 * Handy code to inject raw DHCPv6 packets over responses 3645 * from our server. 3646 * This allows me to take a 3rd party wireshark trace and 3647 * replay it in my code. 3648 */ 3649 static int replyn = 0; 3650 char fname[PATH_MAX], tbuf[UDPLEN_MAX]; 3651 int fd; 3652 ssize_t tlen; 3653 uint8_t *si1, *si2; 3654 uint16_t si_len1, si_len2; 3655 3656 snprintf(fname, sizeof(fname), 3657 "/tmp/dhcp6.reply%d.raw", replyn++); 3658 fd = open(fname, O_RDONLY, 0); 3659 if (fd == -1) { 3660 logerr("%s: open: %s", __func__, fname); 3661 return; 3662 } 3663 tlen = read(fd, tbuf, sizeof(tbuf)); 3664 if (tlen == -1) 3665 logerr("%s: read: %s", __func__, fname); 3666 close(fd); 3667 3668 /* Copy across ServerID so we can work with our own server. */ 3669 si1 = dhcp6_findmoption(r, len, D6_OPTION_SERVERID, &si_len1); 3670 si2 = dhcp6_findmoption(tbuf, (size_t)tlen, 3671 D6_OPTION_SERVERID, &si_len2); 3672 if (si1 != NULL && si2 != NULL && si_len1 == si_len2) 3673 memcpy(si2, si1, si_len2); 3674 r = (struct dhcp6_message *)tbuf; 3675 len = (size_t)tlen; 3676 #endif 3677 3678 recvif: 3679 dhcp6_recvif(ifp, sfrom, r, len); 3680 } 3681 3682 static void 3683 dhcp6_recv(struct dhcpcd_ctx *ctx, struct ipv6_addr *ia) 3684 { 3685 struct sockaddr_in6 from; 3686 union { 3687 struct dhcp6_message dhcp6; 3688 uint8_t buf[UDPLEN_MAX]; /* Maximum UDP message size */ 3689 } iovbuf; 3690 struct iovec iov = { 3691 .iov_base = iovbuf.buf, .iov_len = sizeof(iovbuf.buf), 3692 }; 3693 union { 3694 struct cmsghdr hdr; 3695 uint8_t buf[CMSG_SPACE(sizeof(struct in6_pktinfo))]; 3696 } cmsgbuf = { .buf = { 0 } }; 3697 struct msghdr msg = { 3698 .msg_name = &from, .msg_namelen = sizeof(from), 3699 .msg_iov = &iov, .msg_iovlen = 1, 3700 .msg_control = cmsgbuf.buf, .msg_controllen = sizeof(cmsgbuf.buf), 3701 }; 3702 int s; 3703 ssize_t bytes; 3704 3705 s = ia != NULL ? ia->dhcp6_fd : ctx->dhcp6_rfd; 3706 bytes = recvmsg(s, &msg, 0); 3707 if (bytes == -1) { 3708 logerr(__func__); 3709 return; 3710 } 3711 3712 iov.iov_len = (size_t)bytes; 3713 dhcp6_recvmsg(ctx, &msg, ia); 3714 } 3715 3716 static void 3717 dhcp6_recvaddr(void *arg) 3718 { 3719 struct ipv6_addr *ia = arg; 3720 3721 dhcp6_recv(ia->iface->ctx, ia); 3722 } 3723 3724 static void 3725 dhcp6_recvctx(void *arg) 3726 { 3727 struct dhcpcd_ctx *ctx = arg; 3728 3729 dhcp6_recv(ctx, NULL); 3730 } 3731 3732 int 3733 dhcp6_openraw(void) 3734 { 3735 int fd, v; 3736 3737 fd = socket(PF_INET6, SOCK_RAW | SOCK_CXNB, IPPROTO_UDP); 3738 if (fd == -1) 3739 return -1; 3740 3741 v = 1; 3742 if (setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &v, sizeof(v)) == -1) 3743 goto errexit; 3744 3745 v = offsetof(struct udphdr, uh_sum); 3746 if (setsockopt(fd, IPPROTO_IPV6, IPV6_CHECKSUM, &v, sizeof(v)) == -1) 3747 goto errexit; 3748 3749 return fd; 3750 3751 errexit: 3752 close(fd); 3753 return -1; 3754 } 3755 3756 int 3757 dhcp6_openudp(unsigned int ifindex, struct in6_addr *ia) 3758 { 3759 struct sockaddr_in6 sa; 3760 int n, s; 3761 3762 s = xsocket(PF_INET6, SOCK_DGRAM | SOCK_CXNB, IPPROTO_UDP); 3763 if (s == -1) 3764 goto errexit; 3765 3766 memset(&sa, 0, sizeof(sa)); 3767 sa.sin6_family = AF_INET6; 3768 sa.sin6_port = htons(DHCP6_CLIENT_PORT); 3769 #ifdef BSD 3770 sa.sin6_len = sizeof(sa); 3771 #endif 3772 3773 if (ia != NULL) { 3774 memcpy(&sa.sin6_addr, ia, sizeof(sa.sin6_addr)); 3775 ipv6_setscope(&sa, ifindex); 3776 } 3777 3778 if (bind(s, (struct sockaddr *)&sa, sizeof(sa)) == -1) 3779 goto errexit; 3780 3781 n = 1; 3782 if (setsockopt(s, IPPROTO_IPV6, IPV6_RECVPKTINFO, &n, sizeof(n)) == -1) 3783 goto errexit; 3784 3785 #ifdef SO_RERROR 3786 n = 1; 3787 if (setsockopt(s, SOL_SOCKET, SO_RERROR, &n, sizeof(n)) == -1) 3788 goto errexit; 3789 #endif 3790 3791 return s; 3792 3793 errexit: 3794 logerr(__func__); 3795 if (s != -1) 3796 close(s); 3797 return -1; 3798 } 3799 3800 #ifndef SMALL 3801 static void 3802 dhcp6_activateinterfaces(struct interface *ifp) 3803 { 3804 struct interface *ifd; 3805 size_t i, j; 3806 struct if_ia *ia; 3807 struct if_sla *sla; 3808 3809 for (i = 0; i < ifp->options->ia_len; i++) { 3810 ia = &ifp->options->ia[i]; 3811 if (ia->ia_type != D6_OPTION_IA_PD) 3812 continue; 3813 for (j = 0; j < ia->sla_len; j++) { 3814 sla = &ia->sla[j]; 3815 ifd = if_find(ifp->ctx->ifaces, sla->ifname); 3816 if (ifd == NULL) { 3817 logwarn("%s: cannot delegate to %s", 3818 ifp->name, sla->ifname); 3819 continue; 3820 } 3821 if (!ifd->active) { 3822 loginfox("%s: activating for delegation", 3823 sla->ifname); 3824 dhcpcd_activateinterface(ifd, 3825 DHCPCD_IPV6 | DHCPCD_DHCP6); 3826 } 3827 } 3828 } 3829 } 3830 #endif 3831 3832 static void 3833 dhcp6_start1(void *arg) 3834 { 3835 struct interface *ifp = arg; 3836 struct dhcpcd_ctx *ctx = ifp->ctx; 3837 struct if_options *ifo = ifp->options; 3838 struct dhcp6_state *state; 3839 size_t i; 3840 const struct dhcp_compat *dhc; 3841 3842 if ((ctx->options & (DHCPCD_MASTER|DHCPCD_PRIVSEP)) == DHCPCD_MASTER && 3843 ctx->dhcp6_rfd == -1) 3844 { 3845 ctx->dhcp6_rfd = dhcp6_openudp(0, NULL); 3846 if (ctx->dhcp6_rfd == -1) { 3847 logerr(__func__); 3848 return; 3849 } 3850 eloop_event_add(ctx->eloop, ctx->dhcp6_rfd, dhcp6_recvctx, ctx); 3851 } 3852 3853 if (!IN_PRIVSEP(ctx) && ctx->dhcp6_wfd == -1) { 3854 ctx->dhcp6_wfd = dhcp6_openraw(); 3855 if (ctx->dhcp6_wfd == -1) { 3856 logerr(__func__); 3857 return; 3858 } 3859 } 3860 3861 state = D6_STATE(ifp); 3862 /* If no DHCPv6 options are configured, 3863 match configured DHCPv4 options to DHCPv6 equivalents. */ 3864 for (i = 0; i < sizeof(ifo->requestmask6); i++) { 3865 if (ifo->requestmask6[i] != '\0') 3866 break; 3867 } 3868 if (i == sizeof(ifo->requestmask6)) { 3869 for (dhc = dhcp_compats; dhc->dhcp_opt; dhc++) { 3870 if (DHC_REQ(ifo->requestmask, ifo->nomask, dhc->dhcp_opt)) 3871 add_option_mask(ifo->requestmask6, 3872 dhc->dhcp6_opt); 3873 } 3874 if (ifo->fqdn != FQDN_DISABLE || ifo->options & DHCPCD_HOSTNAME) 3875 add_option_mask(ifo->requestmask6, D6_OPTION_FQDN); 3876 } 3877 3878 #ifndef SMALL 3879 /* Rapid commit won't work with Prefix Delegation Exclusion */ 3880 if (dhcp6_findselfsla(ifp)) 3881 del_option_mask(ifo->requestmask6, D6_OPTION_RAPID_COMMIT); 3882 #endif 3883 3884 if (state->state == DH6S_INFORM) { 3885 add_option_mask(ifo->requestmask6, D6_OPTION_INFO_REFRESH_TIME); 3886 dhcp6_startinform(ifp); 3887 } else { 3888 del_option_mask(ifo->requestmask6, D6_OPTION_INFO_REFRESH_TIME); 3889 dhcp6_startinit(ifp); 3890 } 3891 3892 #ifndef SMALL 3893 dhcp6_activateinterfaces(ifp); 3894 #endif 3895 } 3896 3897 int 3898 dhcp6_start(struct interface *ifp, enum DH6S init_state) 3899 { 3900 struct dhcp6_state *state; 3901 3902 state = D6_STATE(ifp); 3903 if (state != NULL) { 3904 switch (init_state) { 3905 case DH6S_INIT: 3906 goto gogogo; 3907 case DH6S_INFORM: 3908 if (state->state == DH6S_INIT || 3909 state->state == DH6S_INFORMED || 3910 (state->state == DH6S_DISCOVER && 3911 !(ifp->options->options & DHCPCD_IA_FORCED) && 3912 !ipv6nd_hasradhcp(ifp, true))) 3913 dhcp6_startinform(ifp); 3914 break; 3915 case DH6S_REQUEST: 3916 if (ifp->options->options & DHCPCD_DHCP6 && 3917 (state->state == DH6S_INIT || 3918 state->state == DH6S_INFORM || 3919 state->state == DH6S_INFORMED || 3920 state->state == DH6S_DELEGATED)) 3921 { 3922 /* Change from stateless to stateful */ 3923 init_state = DH6S_INIT; 3924 goto gogogo; 3925 } 3926 break; 3927 case DH6S_CONFIRM: 3928 init_state = DH6S_INIT; 3929 goto gogogo; 3930 default: 3931 /* Not possible, but sushes some compiler warnings. */ 3932 break; 3933 } 3934 return 0; 3935 } else { 3936 switch (init_state) { 3937 case DH6S_CONFIRM: 3938 /* No DHCPv6 config, no existing state 3939 * so nothing to do. */ 3940 return 0; 3941 case DH6S_INFORM: 3942 break; 3943 default: 3944 init_state = DH6S_INIT; 3945 break; 3946 } 3947 } 3948 3949 if (!(ifp->options->options & DHCPCD_DHCP6)) 3950 return 0; 3951 3952 ifp->if_data[IF_DATA_DHCP6] = calloc(1, sizeof(*state)); 3953 state = D6_STATE(ifp); 3954 if (state == NULL) 3955 return -1; 3956 3957 state->sol_max_rt = SOL_MAX_RT; 3958 state->inf_max_rt = INF_MAX_RT; 3959 TAILQ_INIT(&state->addrs); 3960 3961 gogogo: 3962 state->state = init_state; 3963 state->lerror = 0; 3964 state->failed = false; 3965 dhcp_set_leasefile(state->leasefile, sizeof(state->leasefile), 3966 AF_INET6, ifp); 3967 if (ipv6_linklocal(ifp) == NULL) { 3968 logdebugx("%s: delaying DHCPv6 for LL address", ifp->name); 3969 ipv6_addlinklocalcallback(ifp, dhcp6_start1, ifp); 3970 return 0; 3971 } 3972 3973 dhcp6_start1(ifp); 3974 return 0; 3975 } 3976 3977 void 3978 dhcp6_reboot(struct interface *ifp) 3979 { 3980 struct dhcp6_state *state; 3981 3982 state = D6_STATE(ifp); 3983 if (state == NULL) 3984 return; 3985 3986 state->lerror = 0; 3987 switch (state->state) { 3988 case DH6S_BOUND: 3989 dhcp6_startrebind(ifp); 3990 break; 3991 default: 3992 dhcp6_startdiscoinform(ifp); 3993 break; 3994 } 3995 } 3996 3997 static void 3998 dhcp6_freedrop(struct interface *ifp, int drop, const char *reason) 3999 { 4000 struct dhcp6_state *state; 4001 struct dhcpcd_ctx *ctx; 4002 unsigned long long options; 4003 4004 if (ifp->options) 4005 options = ifp->options->options; 4006 else 4007 options = ifp->ctx->options; 4008 4009 if (ifp->ctx->eloop) 4010 eloop_timeout_delete(ifp->ctx->eloop, NULL, ifp); 4011 4012 #ifndef SMALL 4013 /* If we're dropping the lease, drop delegated addresses. 4014 * If, for whatever reason, we don't drop them in the future 4015 * then they should at least be marked as deprecated (pltime 0). */ 4016 if (drop && (options & DHCPCD_NODROP) != DHCPCD_NODROP) 4017 dhcp6_delete_delegates(ifp); 4018 #endif 4019 4020 state = D6_STATE(ifp); 4021 if (state) { 4022 /* Failure to send the release may cause this function to 4023 * re-enter */ 4024 if (state->state == DH6S_RELEASE) { 4025 dhcp6_finishrelease(ifp); 4026 return; 4027 } 4028 4029 if (drop && options & DHCPCD_RELEASE && 4030 state->state != DH6S_DELEGATED) 4031 { 4032 if (if_is_link_up(ifp) && 4033 state->state != DH6S_RELEASED && 4034 state->state != DH6S_INFORMED) 4035 { 4036 dhcp6_startrelease(ifp); 4037 return; 4038 } 4039 dhcp_unlink(ifp->ctx, state->leasefile); 4040 } 4041 #ifdef AUTH 4042 else if (state->auth.reconf != NULL) { 4043 /* 4044 * Drop the lease as the token may only be present 4045 * in the initial reply message and not subsequent 4046 * renewals. 4047 * If dhcpcd is restarted, the token is lost. 4048 * XXX persist this in another file? 4049 */ 4050 dhcp_unlink(ifp->ctx, state->leasefile); 4051 } 4052 #endif 4053 4054 dhcp6_freedrop_addrs(ifp, drop, NULL); 4055 free(state->old); 4056 state->old = state->new; 4057 state->old_len = state->new_len; 4058 state->new = NULL; 4059 state->new_len = 0; 4060 if (drop && state->old && 4061 (options & DHCPCD_NODROP) != DHCPCD_NODROP) 4062 { 4063 if (reason == NULL) 4064 reason = "STOP6"; 4065 script_runreason(ifp, reason); 4066 } 4067 free(state->old); 4068 free(state->send); 4069 free(state->recv); 4070 free(state); 4071 ifp->if_data[IF_DATA_DHCP6] = NULL; 4072 } 4073 4074 /* If we don't have any more DHCP6 enabled interfaces, 4075 * close the global socket and release resources */ 4076 ctx = ifp->ctx; 4077 if (ctx->ifaces) { 4078 TAILQ_FOREACH(ifp, ctx->ifaces, next) { 4079 if (D6_STATE(ifp)) 4080 break; 4081 } 4082 } 4083 if (ifp == NULL && ctx->dhcp6_rfd != -1) { 4084 eloop_event_delete(ctx->eloop, ctx->dhcp6_rfd); 4085 close(ctx->dhcp6_rfd); 4086 ctx->dhcp6_rfd = -1; 4087 } 4088 } 4089 4090 void 4091 dhcp6_drop(struct interface *ifp, const char *reason) 4092 { 4093 4094 dhcp6_freedrop(ifp, 1, reason); 4095 } 4096 4097 void 4098 dhcp6_free(struct interface *ifp) 4099 { 4100 4101 dhcp6_freedrop(ifp, 0, NULL); 4102 } 4103 4104 void 4105 dhcp6_abort(struct interface *ifp) 4106 { 4107 struct dhcp6_state *state; 4108 #ifdef ND6_ADVERTISE 4109 struct ipv6_addr *ia; 4110 #endif 4111 4112 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_start1, ifp); 4113 state = D6_STATE(ifp); 4114 if (state == NULL) 4115 return; 4116 4117 #ifdef ND6_ADVERTISE 4118 TAILQ_FOREACH(ia, &state->addrs, next) { 4119 ipv6nd_advertise(ia); 4120 } 4121 #endif 4122 4123 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_startdiscover, ifp); 4124 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_senddiscover, ifp); 4125 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_startinform, ifp); 4126 eloop_timeout_delete(ifp->ctx->eloop, dhcp6_sendinform, ifp); 4127 4128 switch (state->state) { 4129 case DH6S_DISCOVER: /* FALLTHROUGH */ 4130 case DH6S_REQUEST: /* FALLTHROUGH */ 4131 case DH6S_INFORM: 4132 state->state = DH6S_INIT; 4133 break; 4134 default: 4135 break; 4136 } 4137 } 4138 4139 void 4140 dhcp6_handleifa(int cmd, struct ipv6_addr *ia, pid_t pid) 4141 { 4142 struct dhcp6_state *state; 4143 struct interface *ifp = ia->iface; 4144 4145 /* If not running in master mode, listen to this address */ 4146 if (cmd == RTM_NEWADDR && 4147 !(ia->addr_flags & IN6_IFF_NOTUSEABLE) && 4148 ifp->active == IF_ACTIVE_USER && 4149 !(ifp->ctx->options & DHCPCD_MASTER) && 4150 ifp->options->options & DHCPCD_DHCP6) 4151 { 4152 #ifdef PRIVSEP 4153 if (IN_PRIVSEP_SE(ifp->ctx)) { 4154 if (ps_inet_opendhcp6(ia) == -1) 4155 logerr(__func__); 4156 } else 4157 #endif 4158 { 4159 if (ia->dhcp6_fd == -1) 4160 ia->dhcp6_fd = dhcp6_openudp(ia->iface->index, 4161 &ia->addr); 4162 if (ia->dhcp6_fd != -1) 4163 eloop_event_add(ia->iface->ctx->eloop, 4164 ia->dhcp6_fd, dhcp6_recvaddr, ia); 4165 } 4166 } 4167 4168 4169 if ((state = D6_STATE(ifp)) != NULL) 4170 ipv6_handleifa_addrs(cmd, &state->addrs, ia, pid); 4171 } 4172 4173 ssize_t 4174 dhcp6_env(FILE *fp, const char *prefix, const struct interface *ifp, 4175 const struct dhcp6_message *m, size_t len) 4176 { 4177 const struct if_options *ifo; 4178 struct dhcp_opt *opt, *vo; 4179 const uint8_t *p; 4180 struct dhcp6_option o; 4181 size_t i; 4182 char *pfx; 4183 uint32_t en; 4184 const struct dhcpcd_ctx *ctx; 4185 #ifndef SMALL 4186 const struct dhcp6_state *state; 4187 const struct ipv6_addr *ap; 4188 #endif 4189 4190 if (m == NULL) 4191 goto delegated; 4192 4193 if (len < sizeof(*m)) { 4194 /* Should be impossible with guards at packet in 4195 * and reading leases */ 4196 errno = EINVAL; 4197 return -1; 4198 } 4199 4200 ifo = ifp->options; 4201 ctx = ifp->ctx; 4202 4203 /* Zero our indexes */ 4204 for (i = 0, opt = ctx->dhcp6_opts; 4205 i < ctx->dhcp6_opts_len; 4206 i++, opt++) 4207 dhcp_zero_index(opt); 4208 for (i = 0, opt = ifp->options->dhcp6_override; 4209 i < ifp->options->dhcp6_override_len; 4210 i++, opt++) 4211 dhcp_zero_index(opt); 4212 for (i = 0, opt = ctx->vivso; 4213 i < ctx->vivso_len; 4214 i++, opt++) 4215 dhcp_zero_index(opt); 4216 if (asprintf(&pfx, "%s_dhcp6", prefix) == -1) 4217 return -1; 4218 4219 /* Unlike DHCP, DHCPv6 options *may* occur more than once. 4220 * There is also no provision for option concatenation unlike DHCP. */ 4221 p = (const uint8_t *)m + sizeof(*m); 4222 len -= sizeof(*m); 4223 for (; len != 0; p += o.len, len -= o.len) { 4224 if (len < sizeof(o)) { 4225 errno = EINVAL; 4226 break; 4227 } 4228 memcpy(&o, p, sizeof(o)); 4229 p += sizeof(o); 4230 len -= sizeof(o); 4231 o.len = ntohs(o.len); 4232 if (len < o.len) { 4233 errno = EINVAL; 4234 break; 4235 } 4236 o.code = ntohs(o.code); 4237 if (has_option_mask(ifo->nomask6, o.code)) 4238 continue; 4239 for (i = 0, opt = ifo->dhcp6_override; 4240 i < ifo->dhcp6_override_len; 4241 i++, opt++) 4242 if (opt->option == o.code) 4243 break; 4244 if (i == ifo->dhcp6_override_len && 4245 o.code == D6_OPTION_VENDOR_OPTS && 4246 o.len > sizeof(en)) 4247 { 4248 memcpy(&en, p, sizeof(en)); 4249 en = ntohl(en); 4250 vo = vivso_find(en, ifp); 4251 } else 4252 vo = NULL; 4253 if (i == ifo->dhcp6_override_len) { 4254 for (i = 0, opt = ctx->dhcp6_opts; 4255 i < ctx->dhcp6_opts_len; 4256 i++, opt++) 4257 if (opt->option == o.code) 4258 break; 4259 if (i == ctx->dhcp6_opts_len) 4260 opt = NULL; 4261 } 4262 if (opt) { 4263 dhcp_envoption(ifp->ctx, 4264 fp, pfx, ifp->name, 4265 opt, dhcp6_getoption, p, o.len); 4266 } 4267 if (vo) { 4268 dhcp_envoption(ifp->ctx, 4269 fp, pfx, ifp->name, 4270 vo, dhcp6_getoption, 4271 p + sizeof(en), 4272 o.len - sizeof(en)); 4273 } 4274 } 4275 free(pfx); 4276 4277 delegated: 4278 #ifndef SMALL 4279 /* Needed for Delegated Prefixes */ 4280 state = D6_CSTATE(ifp); 4281 TAILQ_FOREACH(ap, &state->addrs, next) { 4282 if (ap->delegating_prefix) 4283 break; 4284 } 4285 if (ap == NULL) 4286 return 1; 4287 if (fprintf(fp, "%s_delegated_dhcp6_prefix=", prefix) == -1) 4288 return -1; 4289 TAILQ_FOREACH(ap, &state->addrs, next) { 4290 if (ap->delegating_prefix == NULL) 4291 continue; 4292 if (ap != TAILQ_FIRST(&state->addrs)) { 4293 if (fputc(' ', fp) == EOF) 4294 return -1; 4295 } 4296 if (fprintf(fp, "%s", ap->saddr) == -1) 4297 return -1; 4298 } 4299 if (fputc('\0', fp) == EOF) 4300 return -1; 4301 #endif 4302 4303 return 1; 4304 } 4305 #endif 4306 4307 #ifndef SMALL 4308 int 4309 dhcp6_dump(struct interface *ifp) 4310 { 4311 struct dhcp6_state *state; 4312 4313 ifp->if_data[IF_DATA_DHCP6] = state = calloc(1, sizeof(*state)); 4314 if (state == NULL) { 4315 logerr(__func__); 4316 return -1; 4317 } 4318 TAILQ_INIT(&state->addrs); 4319 if (dhcp6_readlease(ifp, 0) == -1) { 4320 logerr("dhcp6_readlease"); 4321 return -1; 4322 } 4323 state->reason = "DUMP6"; 4324 return script_runreason(ifp, state->reason); 4325 } 4326 #endif 4327