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_DEFAULT_PRE64_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                 _cleanup_set_free_ Set *addresses = NULL;
 247                 struct in6_addr *a;
 248
 249                 if (!p->assign)
 250                         continue;
 251
 252                 /* radv_generate_addresses() below requires the prefix length <= 64. */
 253                 if (p->prefixlen > 64)
 254                         continue;
 255
 256                 r = radv_generate_addresses(link, p->tokens, &p->prefix, p->prefixlen, &addresses);
 257                 if (r < 0)
 258                         return r;
 259
 260                 SET_FOREACH(a, addresses) {
 261                         _cleanup_(address_freep) 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
 273                         r = link_request_static_address(link, address);
 274                         if (r < 0)
 275                                 return r;
 276                 }
 277         }
 278
 279         return 0;
 280 }
 281
 282 static uint32_t usec_to_lifetime(usec_t usec) {
 283         uint64_t t;
 284
 285         if (usec == USEC_INFINITY)
 286                 return UINT32_MAX;
 287
 288         t = DIV_ROUND_UP(usec, USEC_PER_SEC);
 289         if (t >= UINT32_MAX)
 290                 return UINT32_MAX;
 291
 292         return (uint32_t) t;
 293 }
 294
 295 static int radv_set_prefix(Link *link, Prefix *prefix) {
 296         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 297         int r;
 298
 299         assert(link);
 300         assert(link->radv);
 301         assert(prefix);
 302
 303         r = sd_radv_prefix_new(&p);
 304         if (r < 0)
 305                 return r;
 306
 307         r = sd_radv_prefix_set_prefix(p, &prefix->prefix, prefix->prefixlen);
 308         if (r < 0)
 309                 return r;
 310
 311         r = sd_radv_prefix_set_preferred_lifetime(p, prefix->preferred_lifetime, USEC_INFINITY);
 312         if (r < 0)
 313                 return r;
 314
 315         r = sd_radv_prefix_set_valid_lifetime(p, prefix->valid_lifetime, USEC_INFINITY);
 316         if (r < 0)
 317                 return r;
 318
 319         r = sd_radv_prefix_set_onlink(p, prefix->onlink);
 320         if (r < 0)
 321                 return r;
 322
 323         r = sd_radv_prefix_set_address_autoconfiguration(p, prefix->address_auto_configuration);
 324         if (r < 0)
 325                 return r;
 326
 327         return sd_radv_add_prefix(link->radv, p);
 328 }
 329
 330 static int radv_set_route_prefix(Link *link, RoutePrefix *prefix) {
 331         _cleanup_(sd_radv_route_prefix_unrefp) sd_radv_route_prefix *p = NULL;
 332         int r;
 333
 334         assert(link);
 335         assert(link->radv);
 336         assert(prefix);
 337
 338         r = sd_radv_route_prefix_new(&p);
 339         if (r < 0)
 340                 return r;
 341
 342         r = sd_radv_route_prefix_set_prefix(p, &prefix->prefix, prefix->prefixlen);
 343         if (r < 0)
 344                 return r;
 345
 346         r = sd_radv_route_prefix_set_lifetime(p, prefix->lifetime, USEC_INFINITY);
 347         if (r < 0)
 348                 return r;
 349
 350         return sd_radv_add_route_prefix(link->radv, p);
 351 }
 352
 353 static int radv_set_pref64_prefix(Link *link, pref64Prefix *prefix) {
 354         _cleanup_(sd_radv_pref64_prefix_unrefp) sd_radv_pref64_prefix *p = NULL;
 355         int r;
 356
 357         assert(link);
 358         assert(link->radv);
 359         assert(prefix);
 360
 361         r = sd_radv_pref64_prefix_new(&p);
 362         if (r < 0)
 363                 return r;
 364
 365         r = sd_radv_pref64_prefix_set_prefix(p, &prefix->prefix, prefix->prefixlen, prefix->lifetime);
 366         if (r < 0)
 367                 return r;
 368
 369         return sd_radv_add_pref64_prefix(link->radv, p);
 370 }
 371
 372 static int network_get_ipv6_dns(Network *network, struct in6_addr **ret_addresses, size_t *ret_size) {
 373         _cleanup_free_ struct in6_addr *addresses = NULL;
 374         size_t n_addresses = 0;
 375
 376         assert(network);
 377         assert(ret_addresses);
 378         assert(ret_size);
 379
 380         for (size_t i = 0; i < network->n_dns; i++) {
 381                 union in_addr_union *addr;
 382
 383                 if (network->dns[i]->family != AF_INET6)
 384                         continue;
 385
 386                 addr = &network->dns[i]->address;
 387
 388                 if (in_addr_is_null(AF_INET6, addr) ||
 389                     in_addr_is_link_local(AF_INET6, addr) ||
 390                     in_addr_is_localhost(AF_INET6, addr))
 391                         continue;
 392
 393                 if (!GREEDY_REALLOC(addresses, n_addresses + 1))
 394                         return -ENOMEM;
 395
 396                 addresses[n_addresses++] = addr->in6;
 397         }
 398
 399         *ret_addresses = TAKE_PTR(addresses);
 400         *ret_size = n_addresses;
 401
 402         return n_addresses;
 403 }
 404
 405 static int radv_set_dns(Link *link, Link *uplink) {
 406         _cleanup_free_ struct in6_addr *dns = NULL;
 407         size_t n_dns;
 408         int r;
 409
 410         if (!link->network->router_emit_dns)
 411                 return 0;
 412
 413         if (link->network->router_dns) {
 414                 struct in6_addr *p;
 415
 416                 dns = new(struct in6_addr, link->network->n_router_dns);
 417                 if (!dns)
 418                         return -ENOMEM;
 419
 420                 p = dns;
 421                 for (size_t i = 0; i < link->network->n_router_dns; i++)
 422                         if (in6_addr_is_null(&link->network->router_dns[i])) {
 423                                 if (in6_addr_is_set(&link->ipv6ll_address))
 424                                         *(p++) = link->ipv6ll_address;
 425                         } else
 426                                 *(p++) = link->network->router_dns[i];
 427
 428                 n_dns = p - dns;
 429
 430                 goto set_dns;
 431         }
 432
 433         r = network_get_ipv6_dns(link->network, &dns, &n_dns);
 434         if (r > 0)
 435                 goto set_dns;
 436
 437         if (uplink) {
 438                 assert(uplink->network);
 439
 440                 r = network_get_ipv6_dns(uplink->network, &dns, &n_dns);
 441                 if (r > 0)
 442                         goto set_dns;
 443         }
 444
 445         return 0;
 446
 447 set_dns:
 448         return sd_radv_set_rdnss(link->radv,
 449                                  usec_to_lifetime(link->network->router_dns_lifetime_usec),
 450                                  dns, n_dns);
 451 }
 452
 453 static int radv_set_domains(Link *link, Link *uplink) {
 454         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 455         OrderedSet *search_domains;
 456
 457         if (!link->network->router_emit_domains)
 458                 return 0;
 459
 460         search_domains = link->network->router_search_domains;
 461
 462         if (search_domains)
 463                 goto set_domains;
 464
 465         search_domains = link->network->search_domains;
 466         if (search_domains)
 467                 goto set_domains;
 468
 469         if (uplink) {
 470                 assert(uplink->network);
 471
 472                 search_domains = uplink->network->search_domains;
 473                 if (search_domains)
 474                         goto set_domains;
 475         }
 476
 477         return 0;
 478
 479 set_domains:
 480         s = ordered_set_get_strv(search_domains);
 481         if (!s)
 482                 return log_oom();
 483
 484         return sd_radv_set_dnssl(link->radv,
 485                                  usec_to_lifetime(link->network->router_dns_lifetime_usec),
 486                                  s);
 487
 488 }
 489
 490 static int radv_find_uplink(Link *link, Link **ret) {
 491         int r;
 492
 493         assert(link);
 494
 495         if (link->network->router_uplink_name)
 496                 return link_get_by_name(link->manager, link->network->router_uplink_name, ret);
 497
 498         if (link->network->router_uplink_index > 0)
 499                 return link_get_by_index(link->manager, link->network->router_uplink_index, ret);
 500
 501         if (link->network->router_uplink_index == UPLINK_INDEX_AUTO) {
 502                 if (link_dhcp_pd_is_enabled(link))
 503                         r = dhcp_pd_find_uplink(link, ret); /* When DHCP-PD is enabled, use its uplink. */
 504                 else
 505                         r = manager_find_uplink(link->manager, AF_INET6, link, ret);
 506                 if (r < 0)
 507                         /* It is not necessary to propagate error in automatic selection. */
 508                         *ret = NULL;
 509                 return 0;
 510         }
 511
 512         *ret = NULL;
 513         return 0;
 514 }
 515
 516 static int radv_configure(Link *link) {
 517         Link *uplink = NULL;
 518         RoutePrefix *q;
 519         pref64Prefix *n;
 520         Prefix *p;
 521         int r;
 522
 523         assert(link);
 524         assert(link->network);
 525
 526         if (link->radv)
 527                 return -EBUSY;
 528
 529         r = sd_radv_new(&link->radv);
 530         if (r < 0)
 531                 return r;
 532
 533         r = sd_radv_attach_event(link->radv, link->manager->event, 0);
 534         if (r < 0)
 535                 return r;
 536
 537         if (link->hw_addr.length == ETH_ALEN) {
 538                 r = sd_radv_set_mac(link->radv, &link->hw_addr.ether);
 539                 if (r < 0)
 540                         return r;
 541         }
 542
 543         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 544         if (r < 0)
 545                 return r;
 546
 547         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 548         if (r < 0)
 549                 return r;
 550
 551         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 552         if (r < 0)
 553                 return r;
 554
 555         r = sd_radv_set_router_lifetime(link->radv, link->network->router_lifetime_usec);
 556         if (r < 0)
 557                 return r;
 558
 559         r = sd_radv_set_hop_limit(link->radv, link->network->router_hop_limit);
 560         if (r < 0)
 561                 return r;
 562
 563         if (link->network->router_lifetime_usec > 0) {
 564                 r = sd_radv_set_preference(link->radv, link->network->router_preference);
 565                 if (r < 0)
 566                         return r;
 567         }
 568
 569         if (link->network->router_retransmit_usec > 0) {
 570                 r = sd_radv_set_retransmit(link->radv, DIV_ROUND_UP(link->network->router_retransmit_usec, USEC_PER_MSEC));
 571                 if (r < 0)
 572                         return r;
 573         }
 574
 575         HASHMAP_FOREACH(p, link->network->prefixes_by_section) {
 576                 r = radv_set_prefix(link, p);
 577                 if (r < 0 && r != -EEXIST)
 578                         return r;
 579         }
 580
 581         HASHMAP_FOREACH(q, link->network->route_prefixes_by_section) {
 582                 r = radv_set_route_prefix(link, q);
 583                 if (r < 0 && r != -EEXIST)
 584                         return r;
 585         }
 586
 587         HASHMAP_FOREACH(n, link->network->pref64_prefixes_by_section) {
 588                 r = radv_set_pref64_prefix(link, n);
 589                 if (r < 0 && r != -EEXIST)
 590                         return r;
 591         }
 592
 593         (void) radv_find_uplink(link, &uplink);
 594
 595         r = radv_set_dns(link, uplink);
 596         if (r < 0)
 597                 return log_link_debug_errno(link, r, "Could not set RA DNS: %m");
 598
 599         r = radv_set_domains(link, uplink);
 600         if (r < 0)
 601                 return log_link_debug_errno(link, r, "Could not set RA Domains: %m");
 602
 603         return 0;
 604 }
 605
 606 int radv_update_mac(Link *link) {
 607         bool restart;
 608         int r;
 609
 610         assert(link);
 611
 612         if (!link->radv)
 613                 return 0;
 614
 615         if (link->hw_addr.length != ETH_ALEN)
 616                 return 0;
 617
 618         restart = sd_radv_is_running(link->radv);
 619
 620         r = sd_radv_stop(link->radv);
 621         if (r < 0)
 622                 return r;
 623
 624         r = sd_radv_set_mac(link->radv, &link->hw_addr.ether);
 625         if (r < 0)
 626                 return r;
 627
 628         if (restart) {
 629                 r = sd_radv_start(link->radv);
 630                 if (r < 0)
 631                         return r;
 632         }
 633
 634         return 0;
 635 }
 636
 637 static int radv_is_ready_to_configure(Link *link) {
 638         bool needs_uplink = false;
 639         int r;
 640
 641         assert(link);
 642         assert(link->network);
 643
 644         if (!link_is_ready_to_configure(link, /* allow_unmanaged = */ false))
 645                 return false;
 646
 647         if (in6_addr_is_null(&link->ipv6ll_address))
 648                 return false;
 649
 650         if (link->hw_addr.length != ETH_ALEN || hw_addr_is_null(&link->hw_addr))
 651                 return false;
 652
 653         if (link->network->router_emit_dns && !link->network->router_dns) {
 654                 _cleanup_free_ struct in6_addr *dns = NULL;
 655                 size_t n_dns;
 656
 657                 r = network_get_ipv6_dns(link->network, &dns, &n_dns);
 658                 if (r < 0)
 659                         return r;
 660
 661                 needs_uplink = r == 0;
 662         }
 663
 664         if (link->network->router_emit_domains &&
 665             !link->network->router_search_domains &&
 666             !link->network->search_domains)
 667                 needs_uplink = true;
 668
 669         if (needs_uplink) {
 670                 Link *uplink = NULL;
 671
 672                 if (radv_find_uplink(link, &uplink) < 0)
 673                         return false;
 674
 675                 if (uplink && !uplink->network)
 676                         return false;
 677         }
 678
 679         return true;
 680 }
 681
 682 static int radv_process_request(Request *req, Link *link, void *userdata) {
 683         int r;
 684
 685         assert(link);
 686
 687         r = radv_is_ready_to_configure(link);
 688         if (r <= 0)
 689                 return r;
 690
 691         r = radv_configure(link);
 692         if (r < 0)
 693                 return log_link_warning_errno(link, r, "Failed to configure IPv6 Router Advertisement engine: %m");
 694
 695         if (link_has_carrier(link)) {
 696                 r = radv_start(link);
 697                 if (r < 0)
 698                         return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 699         }
 700
 701         log_link_debug(link, "IPv6 Router Advertisement engine is configured%s.",
 702                        link_has_carrier(link) ? " and started" : "");
 703         return 1;
 704 }
 705
 706 int link_request_radv(Link *link) {
 707         int r;
 708
 709         assert(link);
 710
 711         if (!link_radv_enabled(link))
 712                 return 0;
 713
 714         if (link->radv)
 715                 return 0;
 716
 717         r = link_queue_request(link, REQUEST_TYPE_RADV, radv_process_request, NULL);
 718         if (r < 0)
 719                 return log_link_warning_errno(link, r, "Failed to request configuring of the IPv6 Router Advertisement engine: %m");
 720
 721         log_link_debug(link, "Requested configuring of the IPv6 Router Advertisement engine.");
 722         return 0;
 723 }
 724
 725 int radv_start(Link *link) {
 726         int r;
 727
 728         assert(link);
 729         assert(link->network);
 730
 731         if (!link->radv)
 732                 return 0;
 733
 734         if (!link_has_carrier(link))
 735                 return 0;
 736
 737         if (in6_addr_is_null(&link->ipv6ll_address))
 738                 return 0;
 739
 740         if (sd_radv_is_running(link->radv))
 741                 return 0;
 742
 743         if (link->network->dhcp_pd_announce) {
 744                 r = dhcp_request_prefix_delegation(link);
 745                 if (r < 0)
 746                         return log_link_debug_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 747         }
 748
 749         log_link_debug(link, "Starting IPv6 Router Advertisements");
 750         return sd_radv_start(link->radv);
 751 }
 752
 753 int radv_add_prefix(
 754                 Link *link,
 755                 const struct in6_addr *prefix,
 756                 uint8_t prefix_len,
 757                 usec_t lifetime_preferred_usec,
 758                 usec_t lifetime_valid_usec) {
 759
 760         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 761         int r;
 762
 763         assert(link);
 764
 765         if (!link->radv)
 766                 return 0;
 767
 768         r = sd_radv_prefix_new(&p);
 769         if (r < 0)
 770                 return r;
 771
 772         r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
 773         if (r < 0)
 774                 return r;
 775
 776         r = sd_radv_prefix_set_preferred_lifetime(p, RADV_DEFAULT_PREFERRED_LIFETIME_USEC, lifetime_preferred_usec);
 777         if (r < 0)
 778                 return r;
 779
 780         r = sd_radv_prefix_set_valid_lifetime(p, RADV_DEFAULT_VALID_LIFETIME_USEC, lifetime_valid_usec);
 781         if (r < 0)
 782                 return r;
 783
 784         r = sd_radv_add_prefix(link->radv, p);
 785         if (r < 0 && r != -EEXIST)
 786                 return r;
 787
 788         return 0;
 789 }
 790
 791 static int prefix_section_verify(Prefix *p) {
 792         assert(p);
 793
 794         if (section_is_invalid(p->section))
 795                 return -EINVAL;
 796
 797         if (in6_addr_is_null(&p->prefix))
 798                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 799                                          "%s: [IPv6Prefix] section without Prefix= field configured, "
 800                                          "or specified prefix is the null address. "
 801                                          "Ignoring [IPv6Prefix] section from line %u.",
 802                                          p->section->filename, p->section->line);
 803
 804         if (p->prefixlen < 3 || p->prefixlen > 128)
 805                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 806                                          "%s: Invalid prefix length %u is specified in [IPv6Prefix] section. "
 807                                          "Valid range is 3…128. Ignoring [IPv6Prefix] section from line %u.",
 808                                          p->section->filename, p->prefixlen, p->section->line);
 809
 810         if (p->prefixlen > 64) {
 811                 log_info("%s:%u: Unusual prefix length %u (> 64) is specified in [IPv6Prefix] section from line %s%s.",
 812                          p->section->filename, p->section->line,
 813                          p->prefixlen,
 814                          p->assign ? ", refusing to assign an address in " : "",
 815                          p->assign ? IN6_ADDR_PREFIX_TO_STRING(&p->prefix, p->prefixlen) : "");
 816
 817                 p->assign = false;
 818         }
 819
 820         if (p->valid_lifetime == 0)
 821                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 822                                          "%s: The valid lifetime of prefix cannot be zero. "
 823                                          "Ignoring [IPv6Prefix] section from line %u.",
 824                                          p->section->filename, p->section->line);
 825
 826         if (p->preferred_lifetime > p->valid_lifetime)
 827                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 828                                          "%s: The preferred lifetime %s is longer than the valid lifetime %s. "
 829                                          "Ignoring [IPv6Prefix] section from line %u.",
 830                                          p->section->filename,
 831                                          FORMAT_TIMESPAN(p->preferred_lifetime, USEC_PER_SEC),
 832                                          FORMAT_TIMESPAN(p->valid_lifetime, USEC_PER_SEC),
 833                                          p->section->line);
 834
 835         return 0;
 836 }
 837
 838 void network_drop_invalid_prefixes(Network *network) {
 839         Prefix *p;
 840
 841         assert(network);
 842
 843         HASHMAP_FOREACH(p, network->prefixes_by_section)
 844                 if (prefix_section_verify(p) < 0)
 845                         prefix_free(p);
 846 }
 847
 848 static int route_prefix_section_verify(RoutePrefix *p) {
 849         if (section_is_invalid(p->section))
 850                 return -EINVAL;
 851
 852         if (p->prefixlen > 128)
 853                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 854                                          "%s: Invalid prefix length %u is specified in [IPv6RoutePrefix] section. "
 855                                          "Valid range is 0…128. Ignoring [IPv6RoutePrefix] section from line %u.",
 856                                          p->section->filename, p->prefixlen, p->section->line);
 857
 858         if (p->lifetime == 0)
 859                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 860                                          "%s: The lifetime of route cannot be zero. "
 861                                          "Ignoring [IPv6RoutePrefix] section from line %u.",
 862                                          p->section->filename, p->section->line);
 863
 864         return 0;
 865 }
 866
 867 void network_drop_invalid_route_prefixes(Network *network) {
 868         RoutePrefix *p;
 869
 870         assert(network);
 871
 872         HASHMAP_FOREACH(p, network->route_prefixes_by_section)
 873                 if (route_prefix_section_verify(p) < 0)
 874                         route_prefix_free(p);
 875 }
 876
 877 void network_drop_invalid_pref64_prefixes(Network *network) {
 878         pref64Prefix *p;
 879
 880         assert(network);
 881
 882         HASHMAP_FOREACH(p, network->pref64_prefixes_by_section)
 883                  if (section_is_invalid(p->section))
 884                          pref64_prefix_free(p);
 885 }
 886
 887 int config_parse_prefix(
 888                 const char *unit,
 889                 const char *filename,
 890                 unsigned line,
 891                 const char *section,
 892                 unsigned section_line,
 893                 const char *lvalue,
 894                 int ltype,
 895                 const char *rvalue,
 896                 void *data,
 897                 void *userdata) {
 898
 899         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 900         Network *network = ASSERT_PTR(userdata);
 901         union in_addr_union a;
 902         int r;
 903
 904         assert(filename);
 905         assert(section);
 906         assert(lvalue);
 907         assert(rvalue);
 908
 909         r = prefix_new_static(network, filename, section_line, &p);
 910         if (r < 0)
 911                 return log_oom();
 912
 913         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &p->prefixlen);
 914         if (r < 0) {
 915                 log_syntax(unit, LOG_WARNING, filename, line, r,
 916                            "Prefix is invalid, ignoring assignment: %s", rvalue);
 917                 return 0;
 918         }
 919
 920         (void) in6_addr_mask(&a.in6, p->prefixlen);
 921         p->prefix = a.in6;
 922
 923         TAKE_PTR(p);
 924         return 0;
 925 }
 926
 927 int config_parse_prefix_boolean(
 928                 const char *unit,
 929                 const char *filename,
 930                 unsigned line,
 931                 const char *section,
 932                 unsigned section_line,
 933                 const char *lvalue,
 934                 int ltype,
 935                 const char *rvalue,
 936                 void *data,
 937                 void *userdata) {
 938
 939         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 940         Network *network = ASSERT_PTR(userdata);
 941         int r;
 942
 943         assert(filename);
 944         assert(section);
 945         assert(lvalue);
 946         assert(rvalue);
 947
 948         r = prefix_new_static(network, filename, section_line, &p);
 949         if (r < 0)
 950                 return log_oom();
 951
 952         r = parse_boolean(rvalue);
 953         if (r < 0) {
 954                 log_syntax(unit, LOG_WARNING, filename, line, r,
 955                            "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
 956                 return 0;
 957         }
 958
 959         if (streq(lvalue, "OnLink"))
 960                 p->onlink = r;
 961         else if (streq(lvalue, "AddressAutoconfiguration"))
 962                 p->address_auto_configuration = r;
 963         else if (streq(lvalue, "Assign"))
 964                 p->assign = r;
 965         else
 966                 assert_not_reached();
 967
 968         TAKE_PTR(p);
 969         return 0;
 970 }
 971
 972 int config_parse_prefix_lifetime(
 973                 const char *unit,
 974                 const char *filename,
 975                 unsigned line,
 976                 const char *section,
 977                 unsigned section_line,
 978                 const char *lvalue,
 979                 int ltype,
 980                 const char *rvalue,
 981                 void *data,
 982                 void *userdata) {
 983
 984         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 985         Network *network = ASSERT_PTR(userdata);
 986         usec_t usec;
 987         int r;
 988
 989         assert(filename);
 990         assert(section);
 991         assert(lvalue);
 992         assert(rvalue);
 993
 994         r = prefix_new_static(network, filename, section_line, &p);
 995         if (r < 0)
 996                 return log_oom();
 997
 998         r = parse_sec(rvalue, &usec);
 999         if (r < 0) {
1000                 log_syntax(unit, LOG_WARNING, filename, line, r,
1001                            "Lifetime is invalid, ignoring assignment: %s", rvalue);
1002                 return 0;
1003         }
1004
1005         if (usec != USEC_INFINITY && DIV_ROUND_UP(usec, USEC_PER_SEC) >= UINT32_MAX) {
1006                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1007                            "Lifetime is too long, ignoring assignment: %s", rvalue);
1008                 return 0;
1009         }
1010
1011         if (streq(lvalue, "PreferredLifetimeSec"))
1012                 p->preferred_lifetime = usec;
1013         else if (streq(lvalue, "ValidLifetimeSec"))
1014                 p->valid_lifetime = usec;
1015         else
1016                 assert_not_reached();
1017
1018         TAKE_PTR(p);
1019         return 0;
1020 }
1021
1022 int config_parse_prefix_metric(
1023                 const char *unit,
1024                 const char *filename,
1025                 unsigned line,
1026                 const char *section,
1027                 unsigned section_line,
1028                 const char *lvalue,
1029                 int ltype,
1030                 const char *rvalue,
1031                 void *data,
1032                 void *userdata) {
1033
1034         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
1035         Network *network = ASSERT_PTR(userdata);
1036         int r;
1037
1038         assert(filename);
1039         assert(section);
1040         assert(lvalue);
1041         assert(rvalue);
1042
1043         r = prefix_new_static(network, filename, section_line, &p);
1044         if (r < 0)
1045                 return log_oom();
1046
1047         r = safe_atou32(rvalue, &p->route_metric);
1048         if (r < 0) {
1049                 log_syntax(unit, LOG_WARNING, filename, line, r,
1050                            "Failed to parse %s=, ignoring assignment: %s",
1051                            lvalue, rvalue);
1052                 return 0;
1053         }
1054
1055         TAKE_PTR(p);
1056         return 0;
1057 }
1058
1059 int config_parse_prefix_token(
1060                 const char *unit,
1061                 const char *filename,
1062                 unsigned line,
1063                 const char *section,
1064                 unsigned section_line,
1065                 const char *lvalue,
1066                 int ltype,
1067                 const char *rvalue,
1068                 void *data,
1069                 void *userdata) {
1070
1071         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
1072         Network *network = ASSERT_PTR(userdata);
1073         int r;
1074
1075         assert(filename);
1076         assert(section);
1077         assert(lvalue);
1078         assert(rvalue);
1079
1080         r = prefix_new_static(network, filename, section_line, &p);
1081         if (r < 0)
1082                 return log_oom();
1083
1084         r = config_parse_address_generation_type(unit, filename, line, section, section_line,
1085                                                  lvalue, ltype, rvalue, &p->tokens, userdata);
1086         if (r < 0)
1087                 return r;
1088
1089         TAKE_PTR(p);
1090         return 0;
1091 }
1092
1093 int config_parse_route_prefix(
1094                 const char *unit,
1095                 const char *filename,
1096                 unsigned line,
1097                 const char *section,
1098                 unsigned section_line,
1099                 const char *lvalue,
1100                 int ltype,
1101                 const char *rvalue,
1102                 void *data,
1103                 void *userdata) {
1104
1105         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
1106         Network *network = ASSERT_PTR(userdata);
1107         union in_addr_union a;
1108         int r;
1109
1110         assert(filename);
1111         assert(section);
1112         assert(lvalue);
1113         assert(rvalue);
1114
1115         r = route_prefix_new_static(network, filename, section_line, &p);
1116         if (r < 0)
1117                 return log_oom();
1118
1119         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &p->prefixlen);
1120         if (r < 0) {
1121                 log_syntax(unit, LOG_WARNING, filename, line, r,
1122                            "Route prefix is invalid, ignoring assignment: %s", rvalue);
1123                 return 0;
1124         }
1125
1126         (void) in6_addr_mask(&a.in6, p->prefixlen);
1127         p->prefix = a.in6;
1128
1129         TAKE_PTR(p);
1130         return 0;
1131 }
1132
1133 int config_parse_route_prefix_lifetime(
1134                 const char *unit,
1135                 const char *filename,
1136                 unsigned line,
1137                 const char *section,
1138                 unsigned section_line,
1139                 const char *lvalue,
1140                 int ltype,
1141                 const char *rvalue,
1142                 void *data,
1143                 void *userdata) {
1144
1145         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
1146         Network *network = ASSERT_PTR(userdata);
1147         usec_t usec;
1148         int r;
1149
1150         assert(filename);
1151         assert(section);
1152         assert(lvalue);
1153         assert(rvalue);
1154
1155         r = route_prefix_new_static(network, filename, section_line, &p);
1156         if (r < 0)
1157                 return log_oom();
1158
1159         r = parse_sec(rvalue, &usec);
1160         if (r < 0) {
1161                 log_syntax(unit, LOG_WARNING, filename, line, r,
1162                            "Route lifetime is invalid, ignoring assignment: %s", rvalue);
1163                 return 0;
1164         }
1165
1166         if (usec != USEC_INFINITY && DIV_ROUND_UP(usec, USEC_PER_SEC) >= UINT32_MAX) {
1167                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1168                            "Lifetime is too long, ignoring assignment: %s", rvalue);
1169                 return 0;
1170         }
1171
1172         p->lifetime = usec;
1173
1174         TAKE_PTR(p);
1175         return 0;
1176 }
1177
1178 int config_parse_pref64_prefix(
1179                 const char *unit,
1180                 const char *filename,
1181                 unsigned line,
1182                 const char *section,
1183                 unsigned section_line,
1184                 const char *lvalue,
1185                 int ltype,
1186                 const char *rvalue,
1187                 void *data,
1188                 void *userdata) {
1189
1190         _cleanup_(pref64_prefix_free_or_set_invalidp) pref64Prefix *p = NULL;
1191         Network *network = ASSERT_PTR(userdata);
1192         union in_addr_union a;
1193         uint8_t prefixlen;
1194         int r;
1195
1196         assert(filename);
1197         assert(section);
1198         assert(lvalue);
1199         assert(rvalue);
1200
1201         r = pref64_prefix_new_static(network, filename, section_line, &p);
1202         if (r < 0)
1203                 return log_oom();
1204
1205         r = in_addr_prefix_from_string(rvalue, AF_INET6, &a, &prefixlen);
1206         if (r < 0) {
1207                 log_syntax(unit, LOG_WARNING, filename, line, r,
1208                            "PREF64 prefix is invalid, ignoring assignment: %s", rvalue);
1209                 return 0;
1210         }
1211
1212         if (!IN_SET(prefixlen, 96, 64, 56, 48, 40, 32)) {
1213                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1214                            "PREF64 prefixlen is invalid, ignoring assignment: %s", rvalue);
1215                 return 0;
1216        }
1217
1218         (void) in6_addr_mask(&a.in6,prefixlen);
1219         p->prefix = a.in6;
1220         p->prefixlen = prefixlen;
1221
1222         TAKE_PTR(p);
1223         return 0;
1224 }
1225
1226 int config_parse_pref64_prefix_lifetime(
1227                 const char *unit,
1228                 const char *filename,
1229                 unsigned line,
1230                 const char *section,
1231                 unsigned section_line,
1232                 const char *lvalue,
1233                 int ltype,
1234                 const char *rvalue,
1235                 void *data,
1236                 void *userdata) {
1237
1238         _cleanup_(pref64_prefix_free_or_set_invalidp) pref64Prefix *p = NULL;
1239         Network *network = ASSERT_PTR(userdata);
1240         usec_t usec;
1241         int r;
1242
1243         assert(filename);
1244         assert(section);
1245         assert(lvalue);
1246         assert(rvalue);
1247
1248         r = pref64_prefix_new_static(network, filename, section_line, &p);
1249         if (r < 0)
1250                 return log_oom();
1251
1252         r = parse_sec(rvalue, &usec);
1253         if (r < 0) {
1254                 log_syntax(unit, LOG_WARNING, filename, line, r,
1255                            "PREF64 lifetime is invalid, ignoring assignment: %s", rvalue);
1256                 return 0;
1257         }
1258
1259         if (usec == USEC_INFINITY || DIV_ROUND_UP(usec, 8 * USEC_PER_SEC) >= UINT64_C(1) << 13) {
1260                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1261                            "PREF64 lifetime is too long, ignoring assignment: %s", rvalue);
1262                 return 0;
1263         }
1264
1265         p->lifetime = usec;
1266
1267         TAKE_PTR(p);
1268         return 0;
1269 }
1270
1271 int config_parse_radv_dns(
1272                 const char *unit,
1273                 const char *filename,
1274                 unsigned line,
1275                 const char *section,
1276                 unsigned section_line,
1277                 const char *lvalue,
1278                 int ltype,
1279                 const char *rvalue,
1280                 void *data,
1281                 void *userdata) {
1282
1283         Network *n = data;
1284         int r;
1285
1286         assert(filename);
1287         assert(lvalue);
1288         assert(rvalue);
1289
1290         if (isempty(rvalue)) {
1291                 n->n_router_dns = 0;
1292                 n->router_dns = mfree(n->router_dns);
1293                 return 0;
1294         }
1295
1296         for (const char *p = rvalue;;) {
1297                 _cleanup_free_ char *w = NULL;
1298                 union in_addr_union a;
1299
1300                 r = extract_first_word(&p, &w, NULL, 0);
1301                 if (r == -ENOMEM)
1302                         return log_oom();
1303                 if (r < 0) {
1304                         log_syntax(unit, LOG_WARNING, filename, line, r,
1305                                    "Failed to extract word, ignoring: %s", rvalue);
1306                         return 0;
1307                 }
1308                 if (r == 0)
1309                         return 0;
1310
1311                 if (streq(w, "_link_local"))
1312                         a = IN_ADDR_NULL;
1313                 else {
1314                         r = in_addr_from_string(AF_INET6, w, &a);
1315                         if (r < 0) {
1316                                 log_syntax(unit, LOG_WARNING, filename, line, r,
1317                                            "Failed to parse DNS server address, ignoring: %s", w);
1318                                 continue;
1319                         }
1320
1321                         if (in_addr_is_null(AF_INET6, &a)) {
1322                                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1323                                            "DNS server address is null, ignoring: %s", w);
1324                                 continue;
1325                         }
1326                 }
1327
1328                 struct in6_addr *m;
1329                 m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
1330                 if (!m)
1331                         return log_oom();
1332
1333                 m[n->n_router_dns++] = a.in6;
1334                 n->router_dns = m;
1335         }
1336 }
1337
1338 int config_parse_radv_search_domains(
1339                 const char *unit,
1340                 const char *filename,
1341                 unsigned line,
1342                 const char *section,
1343                 unsigned section_line,
1344                 const char *lvalue,
1345                 int ltype,
1346                 const char *rvalue,
1347                 void *data,
1348                 void *userdata) {
1349
1350         Network *n = data;
1351         int r;
1352
1353         assert(filename);
1354         assert(lvalue);
1355         assert(rvalue);
1356
1357         if (isempty(rvalue)) {
1358                 n->router_search_domains = ordered_set_free(n->router_search_domains);
1359                 return 0;
1360         }
1361
1362         for (const char *p = rvalue;;) {
1363                 _cleanup_free_ char *w = NULL, *idna = NULL;
1364
1365                 r = extract_first_word(&p, &w, NULL, 0);
1366                 if (r == -ENOMEM)
1367                         return log_oom();
1368                 if (r < 0) {
1369                         log_syntax(unit, LOG_WARNING, filename, line, r,
1370                                    "Failed to extract word, ignoring: %s", rvalue);
1371                         return 0;
1372                 }
1373                 if (r == 0)
1374                         return 0;
1375
1376                 r = dns_name_apply_idna(w, &idna);
1377                 if (r < 0) {
1378                         log_syntax(unit, LOG_WARNING, filename, line, r,
1379                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
1380                         continue;
1381                 } else if (r == 0)
1382                         /* transfer ownership to simplify subsequent operations */
1383                         idna = TAKE_PTR(w);
1384
1385                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops_free);
1386                 if (r < 0)
1387                         return log_oom();
1388
1389                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
1390                 if (r < 0)
1391                         return log_oom();
1392         }
1393 }
1394
1395 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
1396         [RADV_PREFIX_DELEGATION_NONE]   = "no",
1397         [RADV_PREFIX_DELEGATION_STATIC] = "static",
1398         [RADV_PREFIX_DELEGATION_DHCP6]  = "dhcpv6",
1399         [RADV_PREFIX_DELEGATION_BOTH]   = "yes",
1400 };
1401
1402 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
1403                 radv_prefix_delegation,
1404                 RADVPrefixDelegation,
1405                 RADV_PREFIX_DELEGATION_BOTH);
1406
1407 int config_parse_router_prefix_delegation(
1408                 const char *unit,
1409                 const char *filename,
1410                 unsigned line,
1411                 const char *section,
1412                 unsigned section_line,
1413                 const char *lvalue,
1414                 int ltype,
1415                 const char *rvalue,
1416                 void *data,
1417                 void *userdata) {
1418
1419         RADVPrefixDelegation val, *ra = ASSERT_PTR(data);
1420         int r;
1421
1422         assert(filename);
1423         assert(lvalue);
1424         assert(rvalue);
1425
1426         if (streq(lvalue, "IPv6SendRA")) {
1427                 r = parse_boolean(rvalue);
1428                 if (r < 0) {
1429                         log_syntax(unit, LOG_WARNING, filename, line, r,
1430                                    "Invalid %s= setting, ignoring assignment: %s", lvalue, rvalue);
1431                         return 0;
1432                 }
1433
1434                 /* When IPv6SendRA= is enabled, only static prefixes are sent by default, and users
1435                  * need to explicitly enable DHCPv6PrefixDelegation=. */
1436                 *ra = r ? RADV_PREFIX_DELEGATION_STATIC : RADV_PREFIX_DELEGATION_NONE;
1437                 return 0;
1438         }
1439
1440         /* For backward compatibility */
1441         val = radv_prefix_delegation_from_string(rvalue);
1442         if (val < 0) {
1443                 log_syntax(unit, LOG_WARNING, filename, line, val,
1444                            "Invalid %s= setting, ignoring assignment: %s", lvalue, rvalue);
1445                 return 0;
1446         }
1447
1448         *ra = val;
1449         return 0;
1450 }
1451
1452 int config_parse_router_lifetime(
1453                 const char *unit,
1454                 const char *filename,
1455                 unsigned line,
1456                 const char *section,
1457                 unsigned section_line,
1458                 const char *lvalue,
1459                 int ltype,
1460                 const char *rvalue,
1461                 void *data,
1462                 void *userdata) {
1463
1464         usec_t usec, *lifetime = ASSERT_PTR(data);
1465         int r;
1466
1467         assert(filename);
1468         assert(section);
1469         assert(lvalue);
1470         assert(rvalue);
1471
1472         if (isempty(rvalue)) {
1473                 *lifetime = RADV_DEFAULT_ROUTER_LIFETIME_USEC;
1474                 return 0;
1475         }
1476
1477         r = parse_sec(rvalue, &usec);
1478         if (r < 0) {
1479                 log_syntax(unit, LOG_WARNING, filename, line, r,
1480                            "Failed to parse router lifetime, ignoring assignment: %s", rvalue);
1481                 return 0;
1482         }
1483         if (usec > 0) {
1484                 if (usec < RADV_MIN_ROUTER_LIFETIME_USEC) {
1485                         log_syntax(unit, LOG_WARNING, filename, line, 0,
1486                                    "Router lifetime %s is too short, using %s.",
1487                                    FORMAT_TIMESPAN(usec, USEC_PER_SEC),
1488                                    FORMAT_TIMESPAN(RADV_MIN_ROUTER_LIFETIME_USEC, USEC_PER_SEC));
1489                         usec = RADV_MIN_ROUTER_LIFETIME_USEC;
1490                 } else if (usec > RADV_MAX_ROUTER_LIFETIME_USEC) {
1491                         log_syntax(unit, LOG_WARNING, filename, line, 0,
1492                                    "Router lifetime %s is too large, using %s.",
1493                                    FORMAT_TIMESPAN(usec, USEC_PER_SEC),
1494                                    FORMAT_TIMESPAN(RADV_MAX_ROUTER_LIFETIME_USEC, USEC_PER_SEC));
1495                         usec = RADV_MAX_ROUTER_LIFETIME_USEC;
1496                 }
1497         }
1498
1499         *lifetime = usec;
1500         return 0;
1501 }
1502
1503 int config_parse_router_retransmit(
1504                 const char *unit,
1505                 const char *filename,
1506                 unsigned line,
1507                 const char *section,
1508                 unsigned section_line,
1509                 const char *lvalue,
1510                 int ltype,
1511                 const char *rvalue,
1512                 void *data,
1513                 void *userdata) {
1514
1515         usec_t usec, *router_retransmit_usec = ASSERT_PTR(data);
1516         int r;
1517
1518         assert(filename);
1519         assert(section);
1520         assert(lvalue);
1521         assert(rvalue);
1522
1523         if (isempty(rvalue)) {
1524                 *router_retransmit_usec = 0;
1525                 return 0;
1526         }
1527
1528         r = parse_sec(rvalue, &usec);
1529         if (r < 0) {
1530                 log_syntax(unit, LOG_WARNING, filename, line, r,
1531                            "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
1532                 return 0;
1533         }
1534
1535         if (usec != USEC_INFINITY &&
1536             DIV_ROUND_UP(usec, USEC_PER_MSEC) > UINT32_MAX) {
1537                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1538                            "Invalid %s= must be in the range 0...%"PRIu32"Sec, ignoring: %s", lvalue, UINT32_MAX, rvalue);
1539                 return 0;
1540         }
1541
1542         *router_retransmit_usec = usec;
1543         return 0;
1544 }
1545
1546 int config_parse_router_preference(
1547                 const char *unit,
1548                 const char *filename,
1549                 unsigned line,
1550                 const char *section,
1551                 unsigned section_line,
1552                 const char *lvalue,
1553                 int ltype,
1554                 const char *rvalue,
1555                 void *data,
1556                 void *userdata) {
1557
1558         Network *network = userdata;
1559
1560         assert(filename);
1561         assert(section);
1562         assert(lvalue);
1563         assert(rvalue);
1564         assert(data);
1565
1566         if (streq(rvalue, "high"))
1567                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
1568         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
1569                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
1570         else if (streq(rvalue, "low"))
1571                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
1572         else
1573                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1574                            "Invalid router preference, ignoring assignment: %s", rvalue);
1575
1576         return 0;
1577 }