src/network/networkd-radv.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 /***
   3   Copyright © 2017 Intel Corporation. All rights reserved.
   4 ***/
   5
   6 #include <netinet/icmp6.h>
   7 #include <arpa/inet.h>
   8
   9 #include "dns-domain.h"
  10 #include "networkd-address-generation.h"
  11 #include "networkd-address.h"
  12 #include "networkd-dhcp-prefix-delegation.h"
  13 #include "networkd-link.h"
  14 #include "networkd-manager.h"
  15 #include "networkd-network.h"
  16 #include "networkd-queue.h"
  17 #include "networkd-radv.h"
  18 #include "networkd-route-util.h"
  19 #include "parse-util.h"
  20 #include "radv-internal.h"
  21 #include "string-util.h"
  22 #include "string-table.h"
  23 #include "strv.h"
  24
  25 void network_adjust_radv(Network *network) {
  26         assert(network);
  27
  28         /* After this function is called, network->router_prefix_delegation can be treated as a boolean. */
  29
  30         if (network->dhcp_pd < 0)
  31                 /* For backward compatibility. */
  32                 network->dhcp_pd = FLAGS_SET(network->router_prefix_delegation, RADV_PREFIX_DELEGATION_DHCP6);
  33
  34         if (!FLAGS_SET(network->link_local, ADDRESS_FAMILY_IPV6)) {
  35                 if (network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE)
  36                         log_warning("%s: IPv6PrefixDelegation= is enabled but IPv6 link-local addressing is disabled. "
  37                                     "Disabling IPv6PrefixDelegation=.", network->filename);
  38
  39                 network->router_prefix_delegation = RADV_PREFIX_DELEGATION_NONE;
  40         }
  41
  42         if (network->router_prefix_delegation == RADV_PREFIX_DELEGATION_NONE) {
  43                 network->n_router_dns = 0;
  44                 network->router_dns = mfree(network->router_dns);
  45                 network->router_search_domains = ordered_set_free(network->router_search_domains);
  46         }
  47
  48         if (!FLAGS_SET(network->router_prefix_delegation, RADV_PREFIX_DELEGATION_STATIC)) {
  49                 network->prefixes_by_section = hashmap_free_with_destructor(network->prefixes_by_section, prefix_free);
  50                 network->route_prefixes_by_section = hashmap_free_with_destructor(network->route_prefixes_by_section, route_prefix_free);
  51                 network->pref64_prefixes_by_section = hashmap_free_with_destructor(network->pref64_prefixes_by_section, pref64_prefix_free);
  52         }
  53 }
  54
  55 bool link_radv_enabled(Link *link) {
  56         assert(link);
  57
  58         if (!link_may_have_ipv6ll(link, /* check_multicast = */ true))
  59                 return false;
  60
  61         if (link->hw_addr.length != ETH_ALEN)
  62                 return false;
  63
  64         return link->network->router_prefix_delegation;
  65 }
  66
  67 Prefix *prefix_free(Prefix *prefix) {
  68         if (!prefix)
  69                 return NULL;
  70
  71         if (prefix->network) {
  72                 assert(prefix->section);
  73                 hashmap_remove(prefix->network->prefixes_by_section, prefix->section);
  74         }
  75
  76         config_section_free(prefix->section);
  77         set_free(prefix->tokens);
  78
  79         return mfree(prefix);
  80 }
  81
  82 DEFINE_SECTION_CLEANUP_FUNCTIONS(Prefix, prefix_free);
  83
  84 static int prefix_new_static(Network *network, const char *filename, unsigned section_line, Prefix **ret) {
  85         _cleanup_(config_section_freep) ConfigSection *n = NULL;
  86         _cleanup_(prefix_freep) Prefix *prefix = NULL;
  87         int r;
  88
  89         assert(network);
  90         assert(ret);
  91         assert(filename);
  92         assert(section_line > 0);
  93
  94         r = config_section_new(filename, section_line, &n);
  95         if (r < 0)
  96                 return r;
  97
  98         prefix = hashmap_get(network->prefixes_by_section, n);
  99         if (prefix) {
 100                 *ret = TAKE_PTR(prefix);
 101                 return 0;
 102         }
 103
 104         prefix = new(Prefix, 1);
 105         if (!prefix)
 106                 return -ENOMEM;
 107
 108         *prefix = (Prefix) {
 109                 .network = network,
 110                 .section = TAKE_PTR(n),
 111
 112                 .preferred_lifetime = RADV_DEFAULT_PREFERRED_LIFETIME_USEC,
 113                 .valid_lifetime = RADV_DEFAULT_VALID_LIFETIME_USEC,
 114                 .onlink = true,
 115                 .address_auto_configuration = true,
 116         };
 117
 118         r = hashmap_ensure_put(&network->prefixes_by_section, &config_section_hash_ops, prefix->section, prefix);
 119         if (r < 0)
 120                 return r;
 121
 122         *ret = TAKE_PTR(prefix);
 123         return 0;
 124 }
 125
 126 RoutePrefix *route_prefix_free(RoutePrefix *prefix) {
 127         if (!prefix)
 128                 return NULL;
 129
 130         if (prefix->network) {
 131                 assert(prefix->section);
 132                 hashmap_remove(prefix->network->route_prefixes_by_section, prefix->section);
 133         }
 134
 135         config_section_free(prefix->section);
 136
 137         return mfree(prefix);
 138 }
 139
 140 DEFINE_SECTION_CLEANUP_FUNCTIONS(RoutePrefix, route_prefix_free);
 141
 142 static int route_prefix_new_static(Network *network, const char *filename, unsigned section_line, RoutePrefix **ret) {
 143         _cleanup_(config_section_freep) ConfigSection *n = NULL;
 144         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 145         int r;
 146
 147         assert(network);
 148         assert(ret);
 149         assert(filename);
 150         assert(section_line > 0);
 151
 152         r = config_section_new(filename, section_line, &n);
 153         if (r < 0)
 154                 return r;
 155
 156         prefix = hashmap_get(network->route_prefixes_by_section, n);
 157         if (prefix) {
 158                 *ret = TAKE_PTR(prefix);
 159                 return 0;
 160         }
 161
 162         prefix = new(RoutePrefix, 1);
 163         if (!prefix)
 164                 return -ENOMEM;
 165
 166         *prefix = (RoutePrefix) {
 167                 .network = network,
 168                 .section = TAKE_PTR(n),
 169
 170                 .lifetime = RADV_DEFAULT_VALID_LIFETIME_USEC,
 171         };
 172
 173         r = hashmap_ensure_put(&network->route_prefixes_by_section, &config_section_hash_ops, prefix->section, prefix);
 174         if (r < 0)
 175                 return r;
 176
 177         *ret = TAKE_PTR(prefix);
 178         return 0;
 179 }
 180
 181 pref64Prefix *pref64_prefix_free(pref64Prefix *prefix) {
 182         if (!prefix)
 183                 return NULL;
 184
 185         if (prefix->network) {
 186                 assert(prefix->section);
 187                 hashmap_remove(prefix->network->pref64_prefixes_by_section, prefix->section);
 188         }
 189
 190         config_section_free(prefix->section);
 191
 192         return mfree(prefix);
 193 }
 194
 195 DEFINE_SECTION_CLEANUP_FUNCTIONS(pref64Prefix, pref64_prefix_free);
 196
 197 static int pref64_prefix_new_static(Network *network, const char *filename, unsigned section_line, pref64Prefix **ret) {
 198         _cleanup_(config_section_freep) ConfigSection *n = NULL;
 199         _cleanup_(pref64_prefix_freep) pref64Prefix *prefix = NULL;
 200         int r;
 201
 202         assert(network);
 203         assert(ret);
 204         assert(filename);
 205         assert(section_line > 0);
 206
 207         r = config_section_new(filename, section_line, &n);
 208         if (r < 0)
 209                 return r;
 210
 211         prefix = hashmap_get(network->pref64_prefixes_by_section, n);
 212         if (prefix) {
 213                 *ret = TAKE_PTR(prefix);
 214                 return 0;
 215         }
 216
 217         prefix = new(pref64Prefix, 1);
 218         if (!prefix)
 219                 return -ENOMEM;
 220
 221         *prefix = (pref64Prefix) {
 222                 .network = network,
 223                 .section = TAKE_PTR(n),
 224
 225                 .lifetime = RADV_PREF64_DEFAULT_LIFETIME_USEC,
 226         };
 227
 228         r = hashmap_ensure_put(&network->pref64_prefixes_by_section, &config_section_hash_ops, prefix->section, prefix);
 229         if (r < 0)
 230                 return r;
 231
 232         *ret = TAKE_PTR(prefix);
 233         return 0;
 234 }
 235
 236 int link_request_radv_addresses(Link *link) {
 237         Prefix *p;
 238         int r;
 239
 240         assert(link);
 241
 242         if (!link_radv_enabled(link))
 243                 return 0;
 244
 245         HASHMAP_FOREACH(p, link->network->prefixes_by_section) {
 246                 if (!p->assign)
 247                         continue;
 248
 249                 /* radv_generate_addresses() below requires the prefix length <= 64. */
 250                 if (p->prefixlen > 64)
 251                         continue;
 252
 253                 _cleanup_hashmap_free_ Hashmap *tokens_by_address = NULL;
 254                 r = radv_generate_addresses(link, p->tokens, &p->prefix, p->prefixlen, &tokens_by_address);
 255                 if (r < 0)
 256                         return r;
 257
 258                 IPv6Token *token;
 259                 struct in6_addr *a;
 260                 HASHMAP_FOREACH_KEY(token, a, tokens_by_address) {
 261                         _cleanup_(address_unrefp) Address *address = NULL;
 262
 263                         r = address_new(&address);
 264                         if (r < 0)
 265                                 return -ENOMEM;
 266
 267                         address->source = NETWORK_CONFIG_SOURCE_STATIC;
 268                         address->family = AF_INET6;
 269                         address->in_addr.in6 = *a;
 270                         address->prefixlen = p->prefixlen;
 271                         address->route_metric = p->route_metric;
 272                         address->token = ipv6_token_ref(token);
 273
 274                         r = link_request_static_address(link, address);
 275                         if (r < 0)
 276                                 return r;
 277                 }
 278         }
 279
 280         return 0;
 281 }
 282
 283 int link_reconfigure_radv_address(Address *address, Link *link) {
 284         int r;
 285
 286         assert(address);
 287         assert(address->source == NETWORK_CONFIG_SOURCE_STATIC);
 288         assert(link);
 289
 290         r = regenerate_address(address, link);
 291         if (r <= 0)
 292                 return r;
 293
 294         r = link_request_static_address(link, address);
 295         if (r < 0)
 296                 return r;
 297
 298         if (link->static_address_messages != 0) {
 299                 link->static_addresses_configured = false;
 300                 link_set_state(link, LINK_STATE_CONFIGURING);
 301         }
 302
 303         return 0;
 304 }
 305
 306 static int radv_set_prefix(Link *link, Prefix *prefix) {
 307         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 308         int r;
 309
 310         assert(link);
 311         assert(link->radv);
 312         assert(prefix);
 313
 314         r = sd_radv_prefix_new(&p);
 315         if (r < 0)
 316                 return r;
 317
 318         r = sd_radv_prefix_set_prefix(p, &prefix->prefix, prefix->prefixlen);
 319         if (r < 0)
 320                 return r;
 321
 322         r = sd_radv_prefix_set_preferred_lifetime(p, prefix->preferred_lifetime, USEC_INFINITY);
 323         if (r < 0)
 324                 return r;
 325
 326         r = sd_radv_prefix_set_valid_lifetime(p, prefix->valid_lifetime, USEC_INFINITY);
 327         if (r < 0)
 328                 return r;
 329
 330         r = sd_radv_prefix_set_onlink(p, prefix->onlink);
 331         if (r < 0)
 332                 return r;
 333
 334         r = sd_radv_prefix_set_address_autoconfiguration(p, prefix->address_auto_configuration);
 335         if (r < 0)
 336                 return r;
 337
 338         return sd_radv_add_prefix(link->radv, p);
 339 }
 340
 341 static int radv_set_route_prefix(Link *link, RoutePrefix *prefix) {
 342         _cleanup_(sd_radv_route_prefix_unrefp) sd_radv_route_prefix *p = NULL;
 343         int r;
 344
 345         assert(link);
 346         assert(link->radv);
 347         assert(prefix);
 348
 349         r = sd_radv_route_prefix_new(&p);
 350         if (r < 0)
 351                 return r;
 352
 353         r = sd_radv_route_prefix_set_prefix(p, &prefix->prefix, prefix->prefixlen);
 354         if (r < 0)
 355                 return r;
 356
 357         r = sd_radv_route_prefix_set_lifetime(p, prefix->lifetime, USEC_INFINITY);
 358         if (r < 0)
 359                 return r;
 360
 361         return sd_radv_add_route_prefix(link->radv, p);
 362 }
 363
 364 static int radv_set_pref64_prefix(Link *link, pref64Prefix *prefix) {
 365         _cleanup_(sd_radv_pref64_prefix_unrefp) sd_radv_pref64_prefix *p = NULL;
 366         int r;
 367
 368         assert(link);
 369         assert(link->radv);
 370         assert(prefix);
 371
 372         r = sd_radv_pref64_prefix_new(&p);
 373         if (r < 0)
 374                 return r;
 375
 376         r = sd_radv_pref64_prefix_set_prefix(p, &prefix->prefix, prefix->prefixlen, prefix->lifetime);
 377         if (r < 0)
 378                 return r;
 379
 380         return sd_radv_add_pref64_prefix(link->radv, p);
 381 }
 382
 383 static int network_get_ipv6_dns(Network *network, struct in6_addr **ret_addresses, size_t *ret_size) {
 384         _cleanup_free_ struct in6_addr *addresses = NULL;
 385         size_t n_addresses = 0;
 386
 387         assert(network);
 388         assert(ret_addresses);
 389         assert(ret_size);
 390
 391         for (size_t i = 0; i < network->n_dns; i++) {
 392                 union in_addr_union *addr;
 393
 394                 if (network->dns[i]->family != AF_INET6)
 395                         continue;
 396
 397                 addr = &network->dns[i]->address;
 398
 399                 if (in_addr_is_null(AF_INET6, addr) ||
 400                     in_addr_is_link_local(AF_INET6, addr) ||
 401                     in_addr_is_localhost(AF_INET6, addr))
 402                         continue;
 403
 404                 if (!GREEDY_REALLOC(addresses, n_addresses + 1))
 405                         return -ENOMEM;
 406
 407                 addresses[n_addresses++] = addr->in6;
 408         }
 409
 410         *ret_addresses = TAKE_PTR(addresses);
 411         *ret_size = n_addresses;
 412
 413         return n_addresses;
 414 }
 415
 416 static int radv_set_dns(Link *link, Link *uplink) {
 417         _cleanup_free_ struct in6_addr *dns = NULL;
 418         size_t n_dns;
 419         int r;
 420
 421         if (!link->network->router_emit_dns)
 422                 return 0;
 423
 424         if (link->network->router_dns) {
 425                 struct in6_addr *p;
 426
 427                 dns = new(struct in6_addr, link->network->n_router_dns);
 428                 if (!dns)
 429                         return -ENOMEM;
 430
 431                 p = dns;
 432                 for (size_t i = 0; i < link->network->n_router_dns; i++)
 433                         if (in6_addr_is_null(&link->network->router_dns[i])) {
 434                                 if (in6_addr_is_set(&link->ipv6ll_address))
 435                                         *(p++) = link->ipv6ll_address;
 436                         } else
 437                                 *(p++) = link->network->router_dns[i];
 438
 439                 n_dns = p - dns;
 440
 441                 goto set_dns;
 442         }
 443
 444         r = network_get_ipv6_dns(link->network, &dns, &n_dns);
 445         if (r > 0)
 446                 goto set_dns;
 447
 448         if (uplink) {
 449                 assert(uplink->network);
 450
 451                 r = network_get_ipv6_dns(uplink->network, &dns, &n_dns);
 452                 if (r > 0)
 453                         goto set_dns;
 454         }
 455
 456         return 0;
 457
 458 set_dns:
 459         return sd_radv_set_rdnss(link->radv,
 460                                  link->network->router_dns_lifetime_usec,
 461                                  dns, n_dns);
 462 }
 463
 464 static int radv_set_domains(Link *link, Link *uplink) {
 465         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 466         OrderedSet *search_domains;
 467
 468         if (!link->network->router_emit_domains)
 469                 return 0;
 470
 471         search_domains = link->network->router_search_domains;
 472
 473         if (search_domains)
 474                 goto set_domains;
 475
 476         search_domains = link->network->search_domains;
 477         if (search_domains)
 478                 goto set_domains;
 479
 480         if (uplink) {
 481                 assert(uplink->network);
 482
 483                 search_domains = uplink->network->search_domains;
 484                 if (search_domains)
 485                         goto set_domains;
 486         }
 487
 488         return 0;
 489
 490 set_domains:
 491         s = ordered_set_get_strv(search_domains);
 492         if (!s)
 493                 return log_oom();
 494
 495         return sd_radv_set_dnssl(link->radv,
 496                                  link->network->router_dns_lifetime_usec,
 497                                  s);
 498
 499 }
 500
 501 static int radv_find_uplink(Link *link, Link **ret) {
 502         int r;
 503
 504         assert(link);
 505
 506         if (link->network->router_uplink_name)
 507                 return link_get_by_name(link->manager, link->network->router_uplink_name, ret);
 508
 509         if (link->network->router_uplink_index > 0)
 510                 return link_get_by_index(link->manager, link->network->router_uplink_index, ret);
 511
 512         if (link->network->router_uplink_index == UPLINK_INDEX_AUTO) {
 513                 if (link_dhcp_pd_is_enabled(link))
 514                         r = dhcp_pd_find_uplink(link, ret); /* When DHCP-PD is enabled, use its uplink. */
 515                 else
 516                         r = manager_find_uplink(link->manager, AF_INET6, link, ret);
 517                 if (r < 0)
 518                         /* It is not necessary to propagate error in automatic selection. */
 519                         *ret = NULL;
 520                 return 0;
 521         }
 522
 523         *ret = NULL;
 524         return 0;
 525 }
 526
 527 static int radv_configure(Link *link) {
 528         Link *uplink = NULL;
 529         RoutePrefix *q;
 530         pref64Prefix *n;
 531         Prefix *p;
 532         int r;
 533
 534         assert(link);
 535         assert(link->network);
 536
 537         if (link->radv)
 538                 return -EBUSY;
 539
 540         r = sd_radv_new(&link->radv);
 541         if (r < 0)
 542                 return r;
 543
 544         r = sd_radv_attach_event(link->radv, link->manager->event, 0);
 545         if (r < 0)
 546                 return r;
 547
 548         if (link->hw_addr.length == ETH_ALEN) {
 549                 r = sd_radv_set_mac(link->radv, &link->hw_addr.ether);
 550                 if (r < 0)
 551                         return r;
 552         }
 553
 554         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 555         if (r < 0)
 556                 return r;
 557
 558         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 559         if (r < 0)
 560                 return r;
 561
 562         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 563         if (r < 0)
 564                 return r;
 565
 566         r = sd_radv_set_router_lifetime(link->radv, link->network->router_lifetime_usec);
 567         if (r < 0)
 568                 return r;
 569
 570         r = sd_radv_set_hop_limit(link->radv, link->network->router_hop_limit);
 571         if (r < 0)
 572                 return r;
 573
 574         if (link->network->router_lifetime_usec > 0) {
 575                 r = sd_radv_set_preference(link->radv, link->network->router_preference);
 576                 if (r < 0)
 577                         return r;
 578         }
 579
 580         if (link->network->router_retransmit_usec > 0) {
 581                 r = sd_radv_set_retransmit(link->radv, link->network->router_retransmit_usec);
 582                 if (r < 0)
 583                         return r;
 584         }
 585
 586         HASHMAP_FOREACH(p, link->network->prefixes_by_section) {
 587                 r = radv_set_prefix(link, p);
 588                 if (r < 0 && r != -EEXIST)
 589                         return r;
 590         }
 591
 592         HASHMAP_FOREACH(q, link->network->route_prefixes_by_section) {
 593                 r = radv_set_route_prefix(link, q);
 594                 if (r < 0 && r != -EEXIST)
 595                         return r;
 596         }
 597
 598         HASHMAP_FOREACH(n, link->network->pref64_prefixes_by_section) {
 599                 r = radv_set_pref64_prefix(link, n);
 600                 if (r < 0 && r != -EEXIST)
 601                         return r;
 602         }
 603
 604         (void) radv_find_uplink(link, &uplink);
 605
 606         r = radv_set_dns(link, uplink);
 607         if (r < 0)
 608                 return log_link_debug_errno(link, r, "Could not set RA DNS: %m");
 609
 610         r = radv_set_domains(link, uplink);
 611         if (r < 0)
 612                 return log_link_debug_errno(link, r, "Could not set RA Domains: %m");
 613
 614         r = sd_radv_set_home_agent_information(link->radv, link->network->router_home_agent_information);
 615         if (r < 0)
 616                 return r;
 617
 618         r = sd_radv_set_home_agent_preference(link->radv, link->network->router_home_agent_preference);
 619         if (r < 0)
 620                 return r;
 621
 622         r = sd_radv_set_home_agent_lifetime(link->radv, link->network->home_agent_lifetime_usec);
 623         if (r < 0)
 624                 return r;
 625
 626         return 0;
 627 }
 628
 629 int radv_update_mac(Link *link) {
 630         assert(link);
 631
 632         if (!link->radv)
 633                 return 0;
 634
 635         if (link->hw_addr.length != ETH_ALEN)
 636                 return 0;
 637
 638         return sd_radv_set_mac(link->radv, &link->hw_addr.ether);
 639 }
 640
 641 static int radv_is_ready_to_configure(Link *link) {
 642         bool needs_uplink = false;
 643         int r;
 644
 645         assert(link);
 646         assert(link->network);
 647
 648         if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false))
 649                 return false;
 650
 651         if (in6_addr_is_null(&link->ipv6ll_address))
 652                 return false;
 653
 654         if (link->hw_addr.length != ETH_ALEN || hw_addr_is_null(&link->hw_addr))
 655                 return false;
 656
 657         if (link->network->router_emit_dns && !link->network->router_dns) {
 658                 _cleanup_free_ struct in6_addr *dns = NULL;
 659                 size_t n_dns;
 660
 661                 r = network_get_ipv6_dns(link->network, &dns, &n_dns);
 662                 if (r < 0)
 663                         return r;
 664
 665                 needs_uplink = r == 0;
 666         }
 667
 668         if (link->network->router_emit_domains &&
 669             !link->network->router_search_domains &&
 670             !link->network->search_domains)
 671                 needs_uplink = true;
 672
 673         if (needs_uplink) {
 674                 Link *uplink = NULL;
 675
 676                 if (radv_find_uplink(link, &uplink) < 0)
 677                         return false;
 678
 679                 if (uplink && !uplink->network)
 680                         return false;
 681         }
 682
 683         return true;
 684 }
 685
 686 static int radv_process_request(Request *req, Link *link, void *userdata) {
 687         int r;
 688
 689         assert(link);
 690
 691         r = radv_is_ready_to_configure(link);
 692         if (r <= 0)
 693                 return r;
 694
 695         r = radv_configure(link);
 696         if (r < 0)
 697                 return log_link_warning_errno(link, r, "Failed to configure IPv6 Router Advertisement engine: %m");
 698
 699         if (link_has_carrier(link)) {
 700                 r = radv_start(link);
 701                 if (r < 0)
 702                         return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 703         }
 704
 705         log_link_debug(link, "IPv6 Router Advertisement engine is configured%s.",
 706                        link_has_carrier(link) ? " and started" : "");
 707         return 1;
 708 }
 709
 710 int link_request_radv(Link *link) {
 711         int r;
 712
 713         assert(link);
 714
 715         if (!link_radv_enabled(link))
 716                 return 0;
 717
 718         if (link->radv)
 719                 return 0;
 720
 721         r = link_queue_request(link, REQUEST_TYPE_RADV, radv_process_request, NULL);
 722         if (r < 0)
 723                 return log_link_warning_errno(link, r, "Failed to request configuring of the IPv6 Router Advertisement engine: %m");
 724
 725         log_link_debug(link, "Requested configuring of the IPv6 Router Advertisement engine.");
 726         return 0;
 727 }
 728
 729 int radv_start(Link *link) {
 730         int r;
 731
 732         assert(link);
 733         assert(link->network);
 734
 735         if (!link->radv)
 736                 return 0;
 737
 738         if (!link_has_carrier(link))
 739                 return 0;
 740
 741         if (in6_addr_is_null(&link->ipv6ll_address))
 742                 return 0;
 743
 744         if (sd_radv_is_running(link->radv))
 745                 return 0;
 746
 747         if (link->network->dhcp_pd_announce) {
 748                 r = dhcp_request_prefix_delegation(link);
 749                 if (r < 0)
 750                         return log_link_debug_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 751         }
 752
 753         r = sd_radv_set_link_local_address(link->radv, &link->ipv6ll_address);
 754         if (r < 0)
 755                 return r;
 756
 757         log_link_debug(link, "Starting IPv6 Router Advertisements");
 758         return sd_radv_start(link->radv);
 759 }
 760
 761 int radv_add_prefix(
 762                 Link *link,
 763                 const struct in6_addr *prefix,
 764                 uint8_t prefix_len,
 765                 usec_t lifetime_preferred_usec,
 766                 usec_t lifetime_valid_usec) {
 767
 768         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 769         int r;
 770
 771         assert(link);
 772
 773         if (!link->radv)
 774                 return 0;
 775
 776         r = sd_radv_prefix_new(&p);
 777         if (r < 0)
 778                 return r;
 779
 780         r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
 781         if (r < 0)
 782                 return r;
 783
 784         r = sd_radv_prefix_set_preferred_lifetime(p, RADV_DEFAULT_PREFERRED_LIFETIME_USEC, lifetime_preferred_usec);
 785         if (r < 0)
 786                 return r;
 787
 788         r = sd_radv_prefix_set_valid_lifetime(p, RADV_DEFAULT_VALID_LIFETIME_USEC, lifetime_valid_usec);
 789         if (r < 0)
 790                 return r;
 791
 792         r = sd_radv_add_prefix(link->radv, p);
 793         if (r < 0 && r != -EEXIST)
 794                 return r;
 795
 796         return 0;
 797 }
 798
 799 static int prefix_section_verify(Prefix *p) {
 800         assert(p);
 801
 802         if (section_is_invalid(p->section))
 803                 return -EINVAL;
 804
 805         if (in6_addr_is_null(&p->prefix))
 806                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 807                                          "%s: [IPv6Prefix] section without Prefix= field configured, "
 808                                          "or specified prefix is the null address. "
 809                                          "Ignoring [IPv6Prefix] section from line %u.",
 810                                          p->section->filename, p->section->line);
 811
 812         if (p->prefixlen < 3 || p->prefixlen > 128)
 813                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 814                                          "%s: Invalid prefix length %u is specified in [IPv6Prefix] section. "
 815                                          "Valid range is 3…128. Ignoring [IPv6Prefix] section from line %u.",
 816                                          p->section->filename, p->prefixlen, p->section->line);
 817
 818         if (p->prefixlen > 64) {
 819                 log_info("%s:%u: Unusual prefix length %u (> 64) is specified in [IPv6Prefix] section from line %s%s.",
 820                          p->section->filename, p->section->line,
 821                          p->prefixlen,
 822                          p->assign ? ", refusing to assign an address in " : "",
 823                          p->assign ? IN6_ADDR_PREFIX_TO_STRING(&p->prefix, p->prefixlen) : "");
 824
 825                 p->assign = false;
 826         }
 827
 828         if (p->preferred_lifetime > p->valid_lifetime)
 829                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 830                                          "%s: The preferred lifetime %s is longer than the valid lifetime %s. "
 831                                          "Ignoring [IPv6Prefix] section from line %u.",
 832                                          p->section->filename,
 833                                          FORMAT_TIMESPAN(p->preferred_lifetime, USEC_PER_SEC),
 834                                          FORMAT_TIMESPAN(p->valid_lifetime, USEC_PER_SEC),
 835                                          p->section->line);
 836
 837         return 0;
 838 }
 839
 840 void network_drop_invalid_prefixes(Network *network) {
 841         Prefix *p;
 842
 843         assert(network);
 844
 845         HASHMAP_FOREACH(p, network->prefixes_by_section)
 846                 if (prefix_section_verify(p) < 0)
 847                         prefix_free(p);
 848 }
 849
 850 static int route_prefix_section_verify(RoutePrefix *p) {
 851         if (section_is_invalid(p->section))
 852                 return -EINVAL;
 853
 854         if (p->prefixlen > 128)
 855                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 856                                          "%s: Invalid prefix length %u is specified in [IPv6RoutePrefix] section. "
 857                                          "Valid range is 0…128. Ignoring [IPv6RoutePrefix] section from line %u.",
 858                                          p->section->filename, p->prefixlen, p->section->line);
 859
 860         return 0;
 861 }
 862
 863 void network_drop_invalid_route_prefixes(Network *network) {
 864         RoutePrefix *p;
 865
 866         assert(network);
 867
 868         HASHMAP_FOREACH(p, network->route_prefixes_by_section)
 869                 if (route_prefix_section_verify(p) < 0)
 870                         route_prefix_free(p);
 871 }
 872
 873 void network_drop_invalid_pref64_prefixes(Network *network) {
 874         pref64Prefix *p;
 875
 876         assert(network);
 877
 878         HASHMAP_FOREACH(p, network->pref64_prefixes_by_section)
 879                  if (section_is_invalid(p->section))
 880                          pref64_prefix_free(p);
 881 }
 882
 883 int config_parse_prefix(
 884                 const char *unit,
 885                 const char *filename,
 886                 unsigned line,
 887                 const char *section,
 888                 unsigned section_line,
 889                 const char *lvalue,
 890                 int ltype,
 891                 const char *rvalue,
 892                 void *data,
 893                 void *userdata) {
 894
 895         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 896         Network *network = ASSERT_PTR(userdata);
 897         union in_addr_union a;
 898         int r;
 899
 900         assert(filename);
 901         assert(section);
 902         assert(lvalue);
 903         assert(rvalue);
 904
 905         r = prefix_new_static(network, filename, section_line, &p);
 906         if (r < 0)
 907                 return log_oom();
 908
 909         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &p->prefixlen);
 910         if (r < 0) {
 911                 log_syntax(unit, LOG_WARNING, filename, line, r,
 912                            "Prefix is invalid, ignoring assignment: %s", rvalue);
 913                 return 0;
 914         }
 915
 916         (void) in6_addr_mask(&a.in6, p->prefixlen);
 917         p->prefix = a.in6;
 918
 919         TAKE_PTR(p);
 920         return 0;
 921 }
 922
 923 int config_parse_prefix_boolean(
 924                 const char *unit,
 925                 const char *filename,
 926                 unsigned line,
 927                 const char *section,
 928                 unsigned section_line,
 929                 const char *lvalue,
 930                 int ltype,
 931                 const char *rvalue,
 932                 void *data,
 933                 void *userdata) {
 934
 935         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 936         Network *network = ASSERT_PTR(userdata);
 937         int r;
 938
 939         assert(filename);
 940         assert(section);
 941         assert(lvalue);
 942         assert(rvalue);
 943
 944         r = prefix_new_static(network, filename, section_line, &p);
 945         if (r < 0)
 946                 return log_oom();
 947
 948         r = parse_boolean(rvalue);
 949         if (r < 0) {
 950                 log_syntax(unit, LOG_WARNING, filename, line, r,
 951                            "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
 952                 return 0;
 953         }
 954
 955         if (streq(lvalue, "OnLink"))
 956                 p->onlink = r;
 957         else if (streq(lvalue, "AddressAutoconfiguration"))
 958                 p->address_auto_configuration = r;
 959         else if (streq(lvalue, "Assign"))
 960                 p->assign = r;
 961         else
 962                 assert_not_reached();
 963
 964         TAKE_PTR(p);
 965         return 0;
 966 }
 967
 968 int config_parse_prefix_lifetime(
 969                 const char *unit,
 970                 const char *filename,
 971                 unsigned line,
 972                 const char *section,
 973                 unsigned section_line,
 974                 const char *lvalue,
 975                 int ltype,
 976                 const char *rvalue,
 977                 void *data,
 978                 void *userdata) {
 979
 980         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 981         Network *network = ASSERT_PTR(userdata);
 982         usec_t usec;
 983         int r;
 984
 985         assert(filename);
 986         assert(section);
 987         assert(lvalue);
 988         assert(rvalue);
 989
 990         r = prefix_new_static(network, filename, section_line, &p);
 991         if (r < 0)
 992                 return log_oom();
 993
 994         r = parse_sec(rvalue, &usec);
 995         if (r < 0) {
 996                 log_syntax(unit, LOG_WARNING, filename, line, r,
 997                            "Lifetime is invalid, ignoring assignment: %s", rvalue);
 998                 return 0;
 999         }
1000
1001         if (usec != USEC_INFINITY && DIV_ROUND_UP(usec, USEC_PER_SEC) >= UINT32_MAX) {
1002                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1003                            "Lifetime is too long, ignoring assignment: %s", rvalue);
1004                 return 0;
1005         }
1006
1007         if (streq(lvalue, "PreferredLifetimeSec"))
1008                 p->preferred_lifetime = usec;
1009         else if (streq(lvalue, "ValidLifetimeSec"))
1010                 p->valid_lifetime = usec;
1011         else
1012                 assert_not_reached();
1013
1014         TAKE_PTR(p);
1015         return 0;
1016 }
1017
1018 int config_parse_prefix_metric(
1019                 const char *unit,
1020                 const char *filename,
1021                 unsigned line,
1022                 const char *section,
1023                 unsigned section_line,
1024                 const char *lvalue,
1025                 int ltype,
1026                 const char *rvalue,
1027                 void *data,
1028                 void *userdata) {
1029
1030         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
1031         Network *network = ASSERT_PTR(userdata);
1032         int r;
1033
1034         assert(filename);
1035         assert(section);
1036         assert(lvalue);
1037         assert(rvalue);
1038
1039         r = prefix_new_static(network, filename, section_line, &p);
1040         if (r < 0)
1041                 return log_oom();
1042
1043         r = safe_atou32(rvalue, &p->route_metric);
1044         if (r < 0) {
1045                 log_syntax(unit, LOG_WARNING, filename, line, r,
1046                            "Failed to parse %s=, ignoring assignment: %s",
1047                            lvalue, rvalue);
1048                 return 0;
1049         }
1050
1051         TAKE_PTR(p);
1052         return 0;
1053 }
1054
1055 int config_parse_prefix_token(
1056                 const char *unit,
1057                 const char *filename,
1058                 unsigned line,
1059                 const char *section,
1060                 unsigned section_line,
1061                 const char *lvalue,
1062                 int ltype,
1063                 const char *rvalue,
1064                 void *data,
1065                 void *userdata) {
1066
1067         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
1068         Network *network = ASSERT_PTR(userdata);
1069         int r;
1070
1071         assert(filename);
1072         assert(section);
1073         assert(lvalue);
1074         assert(rvalue);
1075
1076         r = prefix_new_static(network, filename, section_line, &p);
1077         if (r < 0)
1078                 return log_oom();
1079
1080         r = config_parse_address_generation_type(unit, filename, line, section, section_line,
1081                                                  lvalue, ltype, rvalue, &p->tokens, userdata);
1082         if (r < 0)
1083                 return r;
1084
1085         TAKE_PTR(p);
1086         return 0;
1087 }
1088
1089 int config_parse_route_prefix(
1090                 const char *unit,
1091                 const char *filename,
1092                 unsigned line,
1093                 const char *section,
1094                 unsigned section_line,
1095                 const char *lvalue,
1096                 int ltype,
1097                 const char *rvalue,
1098                 void *data,
1099                 void *userdata) {
1100
1101         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
1102         Network *network = ASSERT_PTR(userdata);
1103         union in_addr_union a;
1104         int r;
1105
1106         assert(filename);
1107         assert(section);
1108         assert(lvalue);
1109         assert(rvalue);
1110
1111         r = route_prefix_new_static(network, filename, section_line, &p);
1112         if (r < 0)
1113                 return log_oom();
1114
1115         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &p->prefixlen);
1116         if (r < 0) {
1117                 log_syntax(unit, LOG_WARNING, filename, line, r,
1118                            "Route prefix is invalid, ignoring assignment: %s", rvalue);
1119                 return 0;
1120         }
1121
1122         (void) in6_addr_mask(&a.in6, p->prefixlen);
1123         p->prefix = a.in6;
1124
1125         TAKE_PTR(p);
1126         return 0;
1127 }
1128
1129 int config_parse_route_prefix_lifetime(
1130                 const char *unit,
1131                 const char *filename,
1132                 unsigned line,
1133                 const char *section,
1134                 unsigned section_line,
1135                 const char *lvalue,
1136                 int ltype,
1137                 const char *rvalue,
1138                 void *data,
1139                 void *userdata) {
1140
1141         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
1142         Network *network = ASSERT_PTR(userdata);
1143         usec_t usec;
1144         int r;
1145
1146         assert(filename);
1147         assert(section);
1148         assert(lvalue);
1149         assert(rvalue);
1150
1151         r = route_prefix_new_static(network, filename, section_line, &p);
1152         if (r < 0)
1153                 return log_oom();
1154
1155         r = parse_sec(rvalue, &usec);
1156         if (r < 0) {
1157                 log_syntax(unit, LOG_WARNING, filename, line, r,
1158                            "Route lifetime is invalid, ignoring assignment: %s", rvalue);
1159                 return 0;
1160         }
1161
1162         if (usec != USEC_INFINITY && DIV_ROUND_UP(usec, USEC_PER_SEC) >= UINT32_MAX) {
1163                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1164                            "Lifetime is too long, ignoring assignment: %s", rvalue);
1165                 return 0;
1166         }
1167
1168         p->lifetime = usec;
1169
1170         TAKE_PTR(p);
1171         return 0;
1172 }
1173
1174 int config_parse_pref64_prefix(
1175                 const char *unit,
1176                 const char *filename,
1177                 unsigned line,
1178                 const char *section,
1179                 unsigned section_line,
1180                 const char *lvalue,
1181                 int ltype,
1182                 const char *rvalue,
1183                 void *data,
1184                 void *userdata) {
1185
1186         _cleanup_(pref64_prefix_free_or_set_invalidp) pref64Prefix *p = NULL;
1187         Network *network = ASSERT_PTR(userdata);
1188         union in_addr_union a;
1189         uint8_t prefixlen;
1190         int r;
1191
1192         assert(filename);
1193         assert(section);
1194         assert(lvalue);
1195         assert(rvalue);
1196
1197         r = pref64_prefix_new_static(network, filename, section_line, &p);
1198         if (r < 0)
1199                 return log_oom();
1200
1201         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &prefixlen);
1202         if (r < 0) {
1203                 log_syntax(unit, LOG_WARNING, filename, line, r,
1204                            "PREF64 prefix is invalid, ignoring assignment: %s", rvalue);
1205                 return 0;
1206         }
1207
1208         if (!IN_SET(prefixlen, 96, 64, 56, 48, 40, 32)) {
1209                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1210                            "PREF64 prefixlen is invalid, ignoring assignment: %s", rvalue);
1211                 return 0;
1212        }
1213
1214         (void) in6_addr_mask(&a.in6, prefixlen);
1215         p->prefix = a.in6;
1216         p->prefixlen = prefixlen;
1217
1218         TAKE_PTR(p);
1219         return 0;
1220 }
1221
1222 int config_parse_pref64_prefix_lifetime(
1223                 const char *unit,
1224                 const char *filename,
1225                 unsigned line,
1226                 const char *section,
1227                 unsigned section_line,
1228                 const char *lvalue,
1229                 int ltype,
1230                 const char *rvalue,
1231                 void *data,
1232                 void *userdata) {
1233
1234         _cleanup_(pref64_prefix_free_or_set_invalidp) pref64Prefix *p = NULL;
1235         Network *network = ASSERT_PTR(userdata);
1236         usec_t usec;
1237         int r;
1238
1239         assert(filename);
1240         assert(section);
1241         assert(lvalue);
1242         assert(rvalue);
1243
1244         r = pref64_prefix_new_static(network, filename, section_line, &p);
1245         if (r < 0)
1246                 return log_oom();
1247
1248         r = parse_sec(rvalue, &usec);
1249         if (r < 0) {
1250                 log_syntax(unit, LOG_WARNING, filename, line, r,
1251                            "PREF64 lifetime is invalid, ignoring assignment: %s", rvalue);
1252                 return 0;
1253         }
1254
1255         if (usec == USEC_INFINITY || DIV_ROUND_UP(usec, 8 * USEC_PER_SEC) >= UINT64_C(1) << 13) {
1256                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1257                            "PREF64 lifetime is too long, ignoring assignment: %s", rvalue);
1258                 return 0;
1259         }
1260
1261         p->lifetime = usec;
1262
1263         TAKE_PTR(p);
1264         return 0;
1265 }
1266
1267 int config_parse_radv_dns(
1268                 const char *unit,
1269                 const char *filename,
1270                 unsigned line,
1271                 const char *section,
1272                 unsigned section_line,
1273                 const char *lvalue,
1274                 int ltype,
1275                 const char *rvalue,
1276                 void *data,
1277                 void *userdata) {
1278
1279         Network *n = data;
1280         int r;
1281
1282         assert(filename);
1283         assert(lvalue);
1284         assert(rvalue);
1285
1286         if (isempty(rvalue)) {
1287                 n->n_router_dns = 0;
1288                 n->router_dns = mfree(n->router_dns);
1289                 return 0;
1290         }
1291
1292         for (const char *p = rvalue;;) {
1293                 _cleanup_free_ char *w = NULL;
1294                 union in_addr_union a;
1295
1296                 r = extract_first_word(&p, &w, NULL, 0);
1297                 if (r == -ENOMEM)
1298                         return log_oom();
1299                 if (r < 0) {
1300                         log_syntax(unit, LOG_WARNING, filename, line, r,
1301                                    "Failed to extract word, ignoring: %s", rvalue);
1302                         return 0;
1303                 }
1304                 if (r == 0)
1305                         return 0;
1306
1307                 if (streq(w, "_link_local"))
1308                         a = IN_ADDR_NULL;
1309                 else {
1310                         r = in_addr_from_string(AF_INET6, w, &a);
1311                         if (r < 0) {
1312                                 log_syntax(unit, LOG_WARNING, filename, line, r,
1313                                            "Failed to parse DNS server address, ignoring: %s", w);
1314                                 continue;
1315                         }
1316
1317                         if (in_addr_is_null(AF_INET6, &a)) {
1318                                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1319                                            "DNS server address is null, ignoring: %s", w);
1320                                 continue;
1321                         }
1322                 }
1323
1324                 struct in6_addr *m;
1325                 m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
1326                 if (!m)
1327                         return log_oom();
1328
1329                 m[n->n_router_dns++] = a.in6;
1330                 n->router_dns = m;
1331         }
1332 }
1333
1334 int config_parse_radv_search_domains(
1335                 const char *unit,
1336                 const char *filename,
1337                 unsigned line,
1338                 const char *section,
1339                 unsigned section_line,
1340                 const char *lvalue,
1341                 int ltype,
1342                 const char *rvalue,
1343                 void *data,
1344                 void *userdata) {
1345
1346         Network *n = data;
1347         int r;
1348
1349         assert(filename);
1350         assert(lvalue);
1351         assert(rvalue);
1352
1353         if (isempty(rvalue)) {
1354                 n->router_search_domains = ordered_set_free(n->router_search_domains);
1355                 return 0;
1356         }
1357
1358         for (const char *p = rvalue;;) {
1359                 _cleanup_free_ char *w = NULL, *idna = NULL;
1360
1361                 r = extract_first_word(&p, &w, NULL, 0);
1362                 if (r == -ENOMEM)
1363                         return log_oom();
1364                 if (r < 0) {
1365                         log_syntax(unit, LOG_WARNING, filename, line, r,
1366                                    "Failed to extract word, ignoring: %s", rvalue);
1367                         return 0;
1368                 }
1369                 if (r == 0)
1370                         return 0;
1371
1372                 r = dns_name_apply_idna(w, &idna);
1373                 if (r < 0) {
1374                         log_syntax(unit, LOG_WARNING, filename, line, r,
1375                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
1376                         continue;
1377                 } else if (r == 0)
1378                         /* transfer ownership to simplify subsequent operations */
1379                         idna = TAKE_PTR(w);
1380
1381                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops_free);
1382                 if (r < 0)
1383                         return log_oom();
1384
1385                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
1386                 if (r < 0)
1387                         return log_oom();
1388         }
1389 }
1390
1391 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
1392         [RADV_PREFIX_DELEGATION_NONE]   = "no",
1393         [RADV_PREFIX_DELEGATION_STATIC] = "static",
1394         [RADV_PREFIX_DELEGATION_DHCP6]  = "dhcpv6",
1395         [RADV_PREFIX_DELEGATION_BOTH]   = "yes",
1396 };
1397
1398 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
1399                 radv_prefix_delegation,
1400                 RADVPrefixDelegation,
1401                 RADV_PREFIX_DELEGATION_BOTH);
1402
1403 int config_parse_router_prefix_delegation(
1404                 const char *unit,
1405                 const char *filename,
1406                 unsigned line,
1407                 const char *section,
1408                 unsigned section_line,
1409                 const char *lvalue,
1410                 int ltype,
1411                 const char *rvalue,
1412                 void *data,
1413                 void *userdata) {
1414
1415         RADVPrefixDelegation val, *ra = ASSERT_PTR(data);
1416         int r;
1417
1418         assert(filename);
1419         assert(lvalue);
1420         assert(rvalue);
1421
1422         if (streq(lvalue, "IPv6SendRA")) {
1423                 r = parse_boolean(rvalue);
1424                 if (r < 0) {
1425                         log_syntax(unit, LOG_WARNING, filename, line, r,
1426                                    "Invalid %s= setting, ignoring assignment: %s", lvalue, rvalue);
1427                         return 0;
1428                 }
1429
1430                 /* When IPv6SendRA= is enabled, only static prefixes are sent by default, and users
1431                  * need to explicitly enable DHCPv6PrefixDelegation=. */
1432                 *ra = r ? RADV_PREFIX_DELEGATION_STATIC : RADV_PREFIX_DELEGATION_NONE;
1433                 return 0;
1434         }
1435
1436         /* For backward compatibility */
1437         val = radv_prefix_delegation_from_string(rvalue);
1438         if (val < 0) {
1439                 log_syntax(unit, LOG_WARNING, filename, line, val,
1440                            "Invalid %s= setting, ignoring assignment: %s", lvalue, rvalue);
1441                 return 0;
1442         }
1443
1444         *ra = val;
1445         return 0;
1446 }
1447
1448 int config_parse_router_lifetime(
1449                 const char *unit,
1450                 const char *filename,
1451                 unsigned line,
1452                 const char *section,
1453                 unsigned section_line,
1454                 const char *lvalue,
1455                 int ltype,
1456                 const char *rvalue,
1457                 void *data,
1458                 void *userdata) {
1459
1460         usec_t usec, *lifetime = ASSERT_PTR(data);
1461         int r;
1462
1463         assert(filename);
1464         assert(section);
1465         assert(lvalue);
1466         assert(rvalue);
1467
1468         if (isempty(rvalue)) {
1469                 *lifetime = RADV_DEFAULT_ROUTER_LIFETIME_USEC;
1470                 return 0;
1471         }
1472
1473         r = parse_sec(rvalue, &usec);
1474         if (r < 0) {
1475                 log_syntax(unit, LOG_WARNING, filename, line, r,
1476                            "Failed to parse router lifetime, ignoring assignment: %s", rvalue);
1477                 return 0;
1478         }
1479         if (usec > 0) {
1480                 if (usec < RADV_MIN_ROUTER_LIFETIME_USEC) {
1481                         log_syntax(unit, LOG_WARNING, filename, line, 0,
1482                                    "Router lifetime %s is too short, using %s.",
1483                                    FORMAT_TIMESPAN(usec, USEC_PER_SEC),
1484                                    FORMAT_TIMESPAN(RADV_MIN_ROUTER_LIFETIME_USEC, USEC_PER_SEC));
1485                         usec = RADV_MIN_ROUTER_LIFETIME_USEC;
1486                 } else if (usec > RADV_MAX_ROUTER_LIFETIME_USEC) {
1487                         log_syntax(unit, LOG_WARNING, filename, line, 0,
1488                                    "Router lifetime %s is too large, using %s.",
1489                                    FORMAT_TIMESPAN(usec, USEC_PER_SEC),
1490                                    FORMAT_TIMESPAN(RADV_MAX_ROUTER_LIFETIME_USEC, USEC_PER_SEC));
1491                         usec = RADV_MAX_ROUTER_LIFETIME_USEC;
1492                 }
1493         }
1494
1495         *lifetime = usec;
1496         return 0;
1497 }
1498
1499 int config_parse_router_retransmit(
1500                 const char *unit,
1501                 const char *filename,
1502                 unsigned line,
1503                 const char *section,
1504                 unsigned section_line,
1505                 const char *lvalue,
1506                 int ltype,
1507                 const char *rvalue,
1508                 void *data,
1509                 void *userdata) {
1510
1511         usec_t usec, *router_retransmit_usec = ASSERT_PTR(data);
1512         int r;
1513
1514         assert(filename);
1515         assert(section);
1516         assert(lvalue);
1517         assert(rvalue);
1518
1519         if (isempty(rvalue)) {
1520                 *router_retransmit_usec = 0;
1521                 return 0;
1522         }
1523
1524         r = parse_sec(rvalue, &usec);
1525         if (r < 0) {
1526                 log_syntax(unit, LOG_WARNING, filename, line, r,
1527                            "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
1528                 return 0;
1529         }
1530
1531         if (usec != USEC_INFINITY &&
1532             usec > RADV_MAX_RETRANSMIT_USEC) {
1533                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1534                            "Invalid [%s] %s=, ignoring assignment: %s", section, lvalue, rvalue);
1535                 return 0;
1536         }
1537
1538         *router_retransmit_usec = usec;
1539         return 0;
1540 }
1541
1542 int config_parse_router_preference(
1543                 const char *unit,
1544                 const char *filename,
1545                 unsigned line,
1546                 const char *section,
1547                 unsigned section_line,
1548                 const char *lvalue,
1549                 int ltype,
1550                 const char *rvalue,
1551                 void *data,
1552                 void *userdata) {
1553
1554         Network *network = userdata;
1555
1556         assert(filename);
1557         assert(section);
1558         assert(lvalue);
1559         assert(rvalue);
1560         assert(data);
1561
1562         if (streq(rvalue, "high"))
1563                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
1564         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
1565                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
1566         else if (streq(rvalue, "low"))
1567                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
1568         else
1569                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1570                            "Invalid router preference, ignoring assignment: %s", rvalue);
1571
1572         return 0;
1573 }
1574
1575 int config_parse_router_home_agent_lifetime(
1576                 const char *unit,
1577                 const char *filename,
1578                 unsigned line,
1579                 const char *section,
1580                 unsigned section_line,
1581                 const char *lvalue,
1582                 int ltype,
1583                 const char *rvalue,
1584                 void *data,
1585                 void *userdata) {
1586
1587         usec_t usec, *home_agent_lifetime_usec = ASSERT_PTR(data);
1588         int r;
1589
1590         assert(filename);
1591         assert(section);
1592         assert(lvalue);
1593         assert(rvalue);
1594
1595         if (isempty(rvalue)) {
1596                 *home_agent_lifetime_usec = 0;
1597                 return 0;
1598         }
1599
1600         r = parse_sec(rvalue, &usec);
1601         if (r < 0) {
1602                 log_syntax(unit, LOG_WARNING, filename, line, r,
1603                            "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
1604                 return 0;
1605         }
1606
1607         if (!timestamp_is_set(usec) ||
1608             usec > RADV_HOME_AGENT_MAX_LIFETIME_USEC) {
1609                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1610                            "Invalid [%s] %s=, ignoring assignment: %s", section, lvalue, rvalue);
1611                 return 0;
1612         }
1613
1614         *home_agent_lifetime_usec = usec;
1615         return 0;
1616 }