src/network/networkd-radv.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   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-link.h"
  11 #include "networkd-manager.h"
  12 #include "networkd-network.h"
  13 #include "networkd-radv.h"
  14 #include "parse-util.h"
  15 #include "string-util.h"
  16 #include "string-table.h"
  17 #include "strv.h"
  18
  19 Prefix *prefix_free(Prefix *prefix) {
  20         if (!prefix)
  21                 return NULL;
  22
  23         if (prefix->network) {
  24                 assert(prefix->section);
  25                 hashmap_remove(prefix->network->prefixes_by_section, prefix->section);
  26         }
  27
  28         network_config_section_free(prefix->section);
  29         sd_radv_prefix_unref(prefix->radv_prefix);
  30
  31         return mfree(prefix);
  32 }
  33
  34 DEFINE_NETWORK_SECTION_FUNCTIONS(Prefix, prefix_free);
  35
  36 static int prefix_new(Prefix **ret) {
  37         _cleanup_(prefix_freep) Prefix *prefix = NULL;
  38
  39         prefix = new0(Prefix, 1);
  40         if (!prefix)
  41                 return -ENOMEM;
  42
  43         if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
  44                 return -ENOMEM;
  45
  46         *ret = TAKE_PTR(prefix);
  47
  48         return 0;
  49 }
  50
  51 static int prefix_new_static(Network *network, const char *filename, unsigned section_line, Prefix **ret) {
  52         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  53         _cleanup_(prefix_freep) Prefix *prefix = NULL;
  54         int r;
  55
  56         assert(network);
  57         assert(ret);
  58         assert(filename);
  59         assert(section_line > 0);
  60
  61         r = network_config_section_new(filename, section_line, &n);
  62         if (r < 0)
  63                 return r;
  64
  65         prefix = hashmap_get(network->prefixes_by_section, n);
  66         if (prefix) {
  67                 *ret = TAKE_PTR(prefix);
  68                 return 0;
  69         }
  70
  71         r = prefix_new(&prefix);
  72         if (r < 0)
  73                 return r;
  74
  75         prefix->network = network;
  76         prefix->section = TAKE_PTR(n);
  77
  78         r = hashmap_ensure_allocated(&network->prefixes_by_section, &network_config_hash_ops);
  79         if (r < 0)
  80                 return r;
  81
  82         r = hashmap_put(network->prefixes_by_section, prefix->section, prefix);
  83         if (r < 0)
  84                 return r;
  85
  86         *ret = TAKE_PTR(prefix);
  87
  88         return 0;
  89 }
  90
  91 RoutePrefix *route_prefix_free(RoutePrefix *prefix) {
  92         if (!prefix)
  93                 return NULL;
  94
  95         if (prefix->network) {
  96                 assert(prefix->section);
  97                 hashmap_remove(prefix->network->route_prefixes_by_section, prefix->section);
  98         }
  99
 100         network_config_section_free(prefix->section);
 101         sd_radv_route_prefix_unref(prefix->radv_route_prefix);
 102
 103         return mfree(prefix);
 104 }
 105
 106 DEFINE_NETWORK_SECTION_FUNCTIONS(RoutePrefix, route_prefix_free);
 107
 108 static int route_prefix_new(RoutePrefix **ret) {
 109         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 110
 111         prefix = new0(RoutePrefix, 1);
 112         if (!prefix)
 113                 return -ENOMEM;
 114
 115         if (sd_radv_route_prefix_new(&prefix->radv_route_prefix) < 0)
 116                 return -ENOMEM;
 117
 118         *ret = TAKE_PTR(prefix);
 119
 120         return 0;
 121 }
 122
 123 static int route_prefix_new_static(Network *network, const char *filename, unsigned section_line, RoutePrefix **ret) {
 124         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
 125         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 126         int r;
 127
 128         assert(network);
 129         assert(ret);
 130         assert(filename);
 131         assert(section_line > 0);
 132
 133         r = network_config_section_new(filename, section_line, &n);
 134         if (r < 0)
 135                 return r;
 136
 137         prefix = hashmap_get(network->route_prefixes_by_section, n);
 138         if (prefix) {
 139                 *ret = TAKE_PTR(prefix);
 140                 return 0;
 141         }
 142
 143         r = route_prefix_new(&prefix);
 144         if (r < 0)
 145                 return r;
 146
 147         prefix->network = network;
 148         prefix->section = TAKE_PTR(n);
 149
 150         r = hashmap_ensure_allocated(&network->route_prefixes_by_section, &network_config_hash_ops);
 151         if (r < 0)
 152                 return r;
 153
 154         r = hashmap_put(network->route_prefixes_by_section, prefix->section, prefix);
 155         if (r < 0)
 156                 return r;
 157
 158         *ret = TAKE_PTR(prefix);
 159
 160         return 0;
 161 }
 162
 163 void network_verify_prefixes(Network *network) {
 164         Prefix *prefix;
 165
 166         assert(network);
 167
 168         HASHMAP_FOREACH(prefix, network->prefixes_by_section)
 169                 if (section_is_invalid(prefix->section))
 170                         prefix_free(prefix);
 171 }
 172
 173 void network_verify_route_prefixes(Network *network) {
 174         RoutePrefix *prefix;
 175
 176         assert(network);
 177
 178         HASHMAP_FOREACH(prefix, network->route_prefixes_by_section)
 179                 if (section_is_invalid(prefix->section))
 180                         route_prefix_free(prefix);
 181 }
 182
 183 int config_parse_prefix(
 184                 const char *unit,
 185                 const char *filename,
 186                 unsigned line,
 187                 const char *section,
 188                 unsigned section_line,
 189                 const char *lvalue,
 190                 int ltype,
 191                 const char *rvalue,
 192                 void *data,
 193                 void *userdata) {
 194
 195         Network *network = userdata;
 196         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 197         uint8_t prefixlen = 64;
 198         union in_addr_union in6addr;
 199         int r;
 200
 201         assert(filename);
 202         assert(section);
 203         assert(lvalue);
 204         assert(rvalue);
 205         assert(data);
 206
 207         r = prefix_new_static(network, filename, section_line, &p);
 208         if (r < 0)
 209                 return log_oom();
 210
 211         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 212         if (r < 0) {
 213                 log_syntax(unit, LOG_WARNING, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
 214                 return 0;
 215         }
 216
 217         r = sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen);
 218         if (r < 0) {
 219                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set radv prefix, ignoring assignment: %s", rvalue);
 220                 return 0;
 221         }
 222
 223         p = NULL;
 224
 225         return 0;
 226 }
 227
 228 int config_parse_prefix_flags(
 229                 const char *unit,
 230                 const char *filename,
 231                 unsigned line,
 232                 const char *section,
 233                 unsigned section_line,
 234                 const char *lvalue,
 235                 int ltype,
 236                 const char *rvalue,
 237                 void *data,
 238                 void *userdata) {
 239
 240         Network *network = userdata;
 241         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 242         int r;
 243
 244         assert(filename);
 245         assert(section);
 246         assert(lvalue);
 247         assert(rvalue);
 248         assert(data);
 249
 250         r = prefix_new_static(network, filename, section_line, &p);
 251         if (r < 0)
 252                 return log_oom();
 253
 254         r = parse_boolean(rvalue);
 255         if (r < 0) {
 256                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
 257                 return 0;
 258         }
 259
 260         if (streq(lvalue, "OnLink"))
 261                 r = sd_radv_prefix_set_onlink(p->radv_prefix, r);
 262         else if (streq(lvalue, "AddressAutoconfiguration"))
 263                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, r);
 264         if (r < 0) {
 265                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set %s=, ignoring assignment: %m", lvalue);
 266                 return 0;
 267         }
 268
 269         p = NULL;
 270
 271         return 0;
 272 }
 273
 274 int config_parse_prefix_lifetime(
 275                 const char *unit,
 276                 const char *filename,
 277                 unsigned line,
 278                 const char *section,
 279                 unsigned section_line,
 280                 const char *lvalue,
 281                 int ltype,
 282                 const char *rvalue,
 283                 void *data,
 284                 void *userdata) {
 285
 286         Network *network = userdata;
 287         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 288         usec_t usec;
 289         int r;
 290
 291         assert(filename);
 292         assert(section);
 293         assert(lvalue);
 294         assert(rvalue);
 295         assert(data);
 296
 297         r = prefix_new_static(network, filename, section_line, &p);
 298         if (r < 0)
 299                 return log_oom();
 300
 301         r = parse_sec(rvalue, &usec);
 302         if (r < 0) {
 303                 log_syntax(unit, LOG_WARNING, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
 304                 return 0;
 305         }
 306
 307         /* a value of 0xffffffff represents infinity */
 308         if (streq(lvalue, "PreferredLifetimeSec"))
 309                 r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
 310                                                           DIV_ROUND_UP(usec, USEC_PER_SEC));
 311         else if (streq(lvalue, "ValidLifetimeSec"))
 312                 r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
 313                                                       DIV_ROUND_UP(usec, USEC_PER_SEC));
 314         if (r < 0) {
 315                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set %s=, ignoring assignment: %m", lvalue);
 316                 return 0;
 317         }
 318
 319         p = NULL;
 320
 321         return 0;
 322 }
 323
 324 int config_parse_prefix_assign(
 325                 const char *unit,
 326                 const char *filename,
 327                 unsigned line,
 328                 const char *section,
 329                 unsigned section_line,
 330                 const char *lvalue,
 331                 int ltype,
 332                 const char *rvalue,
 333                 void *data,
 334                 void *userdata) {
 335
 336         Network *network = userdata;
 337         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 338         int r;
 339
 340         assert(filename);
 341         assert(section);
 342         assert(lvalue);
 343         assert(rvalue);
 344         assert(data);
 345
 346         r = prefix_new_static(network, filename, section_line, &p);
 347         if (r < 0)
 348                 return log_oom();
 349
 350         r = parse_boolean(rvalue);
 351         if (r < 0) {
 352                 log_syntax(unit, LOG_WARNING, filename, line, r,
 353                            "Failed to parse %s=, ignoring assignment: %s",
 354                            lvalue, rvalue);
 355                 return 0;
 356         }
 357
 358         p->assign = r;
 359         p = NULL;
 360
 361         return 0;
 362 }
 363
 364 int config_parse_route_prefix(
 365                 const char *unit,
 366                 const char *filename,
 367                 unsigned line,
 368                 const char *section,
 369                 unsigned section_line,
 370                 const char *lvalue,
 371                 int ltype,
 372                 const char *rvalue,
 373                 void *data,
 374                 void *userdata) {
 375
 376         Network *network = userdata;
 377         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
 378         uint8_t prefixlen = 64;
 379         union in_addr_union in6addr;
 380         int r;
 381
 382         assert(filename);
 383         assert(section);
 384         assert(lvalue);
 385         assert(rvalue);
 386         assert(data);
 387
 388         r = route_prefix_new_static(network, filename, section_line, &p);
 389         if (r < 0)
 390                 return log_oom();
 391
 392         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 393         if (r < 0) {
 394                 log_syntax(unit, LOG_WARNING, filename, line, r, "Route prefix is invalid, ignoring assignment: %s", rvalue);
 395                 return 0;
 396         }
 397
 398         r = sd_radv_prefix_set_route_prefix(p->radv_route_prefix, &in6addr.in6, prefixlen);
 399         if (r < 0) {
 400                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set route prefix, ignoring assignment: %m");
 401                 return 0;
 402         }
 403
 404         p = NULL;
 405
 406         return 0;
 407 }
 408
 409 int config_parse_route_prefix_lifetime(
 410                 const char *unit,
 411                 const char *filename,
 412                 unsigned line,
 413                 const char *section,
 414                 unsigned section_line,
 415                 const char *lvalue,
 416                 int ltype,
 417                 const char *rvalue,
 418                 void *data,
 419                 void *userdata) {
 420
 421         Network *network = userdata;
 422         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
 423         usec_t usec;
 424         int r;
 425
 426         assert(filename);
 427         assert(section);
 428         assert(lvalue);
 429         assert(rvalue);
 430         assert(data);
 431
 432         r = route_prefix_new_static(network, filename, section_line, &p);
 433         if (r < 0)
 434                 return log_oom();
 435
 436         r = parse_sec(rvalue, &usec);
 437         if (r < 0) {
 438                 log_syntax(unit, LOG_WARNING, filename, line, r,
 439                            "Route lifetime is invalid, ignoring assignment: %s", rvalue);
 440                 return 0;
 441         }
 442
 443         /* a value of 0xffffffff represents infinity */
 444         r = sd_radv_route_prefix_set_lifetime(p->radv_route_prefix, DIV_ROUND_UP(usec, USEC_PER_SEC));
 445         if (r < 0) {
 446                 log_syntax(unit, LOG_WARNING, filename, line, r,
 447                            "Failed to set route lifetime, ignoring assignment: %m");
 448                 return 0;
 449         }
 450
 451         p = NULL;
 452
 453         return 0;
 454 }
 455
 456 static int network_get_ipv6_dns(Network *network, struct in6_addr **ret_addresses, size_t *ret_size) {
 457         _cleanup_free_ struct in6_addr *addresses = NULL;
 458         size_t n_addresses = 0, n_allocated = 0;
 459
 460         assert(network);
 461         assert(ret_addresses);
 462         assert(ret_size);
 463
 464         for (size_t i = 0; i < network->n_dns; i++) {
 465                 union in_addr_union *addr;
 466
 467                 if (network->dns[i]->family != AF_INET6)
 468                         continue;
 469
 470                 addr = &network->dns[i]->address;
 471
 472                 if (in_addr_is_null(AF_INET6, addr) ||
 473                     in_addr_is_link_local(AF_INET6, addr) ||
 474                     in_addr_is_localhost(AF_INET6, addr))
 475                         continue;
 476
 477                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 478                         return -ENOMEM;
 479
 480                 addresses[n_addresses++] = addr->in6;
 481         }
 482
 483         *ret_addresses = TAKE_PTR(addresses);
 484         *ret_size = n_addresses;
 485
 486         return n_addresses;
 487 }
 488
 489 static int radv_set_dns(Link *link, Link *uplink) {
 490         _cleanup_free_ struct in6_addr *dns = NULL;
 491         usec_t lifetime_usec;
 492         size_t n_dns;
 493         int r;
 494
 495         if (!link->network->router_emit_dns)
 496                 return 0;
 497
 498         if (link->network->router_dns) {
 499                 struct in6_addr *p;
 500
 501                 dns = new(struct in6_addr, link->network->n_router_dns);
 502                 if (!dns)
 503                         return -ENOMEM;
 504
 505                 p = dns;
 506                 for (size_t i = 0; i < link->network->n_router_dns; i++)
 507                         if (IN6_IS_ADDR_UNSPECIFIED(&link->network->router_dns[i])) {
 508                                 if (!IN6_IS_ADDR_UNSPECIFIED(&link->ipv6ll_address))
 509                                         *(p++) = link->ipv6ll_address;
 510                         } else
 511                                 *(p++) = link->network->router_dns[i];
 512
 513                 n_dns = p - dns;
 514                 lifetime_usec = link->network->router_dns_lifetime_usec;
 515
 516                 goto set_dns;
 517         }
 518
 519         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 520
 521         r = network_get_ipv6_dns(link->network, &dns, &n_dns);
 522         if (r > 0)
 523                 goto set_dns;
 524
 525         if (uplink) {
 526                 if (!uplink->network) {
 527                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 528                         return 0;
 529                 }
 530
 531                 r = network_get_ipv6_dns(uplink->network, &dns, &n_dns);
 532                 if (r > 0)
 533                         goto set_dns;
 534         }
 535
 536         return 0;
 537
 538  set_dns:
 539         return sd_radv_set_rdnss(link->radv,
 540                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 541                                  dns, n_dns);
 542 }
 543
 544 static int radv_set_domains(Link *link, Link *uplink) {
 545         OrderedSet *search_domains;
 546         usec_t lifetime_usec;
 547         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 548
 549         if (!link->network->router_emit_domains)
 550                 return 0;
 551
 552         search_domains = link->network->router_search_domains;
 553         lifetime_usec = link->network->router_dns_lifetime_usec;
 554
 555         if (search_domains)
 556                 goto set_domains;
 557
 558         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 559
 560         search_domains = link->network->search_domains;
 561         if (search_domains)
 562                 goto set_domains;
 563
 564         if (uplink) {
 565                 if (!uplink->network) {
 566                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 567                         return 0;
 568                 }
 569
 570                 search_domains = uplink->network->search_domains;
 571                 if (search_domains)
 572                         goto set_domains;
 573         }
 574
 575         return 0;
 576
 577  set_domains:
 578         s = ordered_set_get_strv(search_domains);
 579         if (!s)
 580                 return log_oom();
 581
 582         return sd_radv_set_dnssl(link->radv,
 583                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 584                                  s);
 585
 586 }
 587
 588 int radv_emit_dns(Link *link) {
 589         Link *uplink;
 590         int r;
 591
 592         uplink = manager_find_uplink(link->manager, link);
 593
 594         r = radv_set_dns(link, uplink);
 595         if (r < 0)
 596                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 597
 598         r = radv_set_domains(link, uplink);
 599         if (r < 0)
 600                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 601
 602         return 0;
 603 }
 604
 605 int radv_configure(Link *link) {
 606         int r;
 607
 608         assert(link);
 609         assert(link->network);
 610
 611         r = sd_radv_new(&link->radv);
 612         if (r < 0)
 613                 return r;
 614
 615         r = sd_radv_attach_event(link->radv, NULL, 0);
 616         if (r < 0)
 617                 return r;
 618
 619         r = sd_radv_set_mac(link->radv, &link->mac);
 620         if (r < 0)
 621                 return r;
 622
 623         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 624         if (r < 0)
 625                 return r;
 626
 627         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 628         if (r < 0)
 629                 return r;
 630
 631         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 632         if (r < 0)
 633                 return r;
 634
 635         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 636            not a router */
 637         r = sd_radv_set_router_lifetime(link->radv,
 638                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 639         if (r < 0)
 640                 return r;
 641
 642         if (link->network->router_lifetime_usec > 0) {
 643                 r = sd_radv_set_preference(link->radv,
 644                                            link->network->router_preference);
 645                 if (r < 0)
 646                         return r;
 647         }
 648
 649         if (link->network->router_prefix_delegation & RADV_PREFIX_DELEGATION_STATIC) {
 650                 RoutePrefix *q;
 651                 Prefix *p;
 652
 653                 HASHMAP_FOREACH(p, link->network->prefixes_by_section) {
 654                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 655                         if (r == -EEXIST)
 656                                 continue;
 657                         if (r == -ENOEXEC) {
 658                                 log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section.");
 659                                 continue;
 660                         }
 661                         if (r < 0)
 662                                 return r;
 663                 }
 664
 665                 HASHMAP_FOREACH(q, link->network->route_prefixes_by_section) {
 666                         r = sd_radv_add_route_prefix(link->radv, q->radv_route_prefix, false);
 667                         if (r == -EEXIST)
 668                                 continue;
 669                         if (r < 0)
 670                                 return r;
 671                 }
 672         }
 673
 674         return 0;
 675 }
 676
 677 int radv_add_prefix(
 678                 Link *link,
 679                 const struct in6_addr *prefix,
 680                 uint8_t prefix_len,
 681                 uint32_t lifetime_preferred,
 682                 uint32_t lifetime_valid) {
 683
 684         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 685         int r;
 686
 687         assert(link);
 688
 689         if (!link->radv)
 690                 return 0;
 691
 692         r = sd_radv_prefix_new(&p);
 693         if (r < 0)
 694                 return r;
 695
 696         r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
 697         if (r < 0)
 698                 return r;
 699
 700         r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred);
 701         if (r < 0)
 702                 return r;
 703
 704         r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid);
 705         if (r < 0)
 706                 return r;
 707
 708         r = sd_radv_add_prefix(link->radv, p, true);
 709         if (r < 0 && r != -EEXIST)
 710                 return r;
 711
 712         return 0;
 713 }
 714
 715 int config_parse_radv_dns(
 716                 const char *unit,
 717                 const char *filename,
 718                 unsigned line,
 719                 const char *section,
 720                 unsigned section_line,
 721                 const char *lvalue,
 722                 int ltype,
 723                 const char *rvalue,
 724                 void *data,
 725                 void *userdata) {
 726
 727         Network *n = data;
 728         int r;
 729
 730         assert(filename);
 731         assert(lvalue);
 732         assert(rvalue);
 733
 734         for (const char *p = rvalue;;) {
 735                 _cleanup_free_ char *w = NULL;
 736                 union in_addr_union a;
 737
 738                 r = extract_first_word(&p, &w, NULL, 0);
 739                 if (r == -ENOMEM)
 740                         return log_oom();
 741                 if (r < 0) {
 742                         log_syntax(unit, LOG_WARNING, filename, line, r,
 743                                    "Failed to extract word, ignoring: %s", rvalue);
 744                         return 0;
 745                 }
 746                 if (r == 0)
 747                         return 0;
 748
 749                 if (streq(w, "_link_local"))
 750                         a = IN_ADDR_NULL;
 751                 else {
 752                         r = in_addr_from_string(AF_INET6, w, &a);
 753                         if (r < 0) {
 754                                 log_syntax(unit, LOG_WARNING, filename, line, r,
 755                                            "Failed to parse DNS server address, ignoring: %s", w);
 756                                 continue;
 757                         }
 758
 759                         if (in_addr_is_null(AF_INET6, &a)) {
 760                                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 761                                            "DNS server address is null, ignoring: %s", w);
 762                                 continue;
 763                         }
 764                 }
 765
 766                 struct in6_addr *m;
 767                 m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
 768                 if (!m)
 769                         return log_oom();
 770
 771                 m[n->n_router_dns++] = a.in6;
 772                 n->router_dns = m;
 773         }
 774 }
 775
 776 int config_parse_radv_search_domains(
 777                 const char *unit,
 778                 const char *filename,
 779                 unsigned line,
 780                 const char *section,
 781                 unsigned section_line,
 782                 const char *lvalue,
 783                 int ltype,
 784                 const char *rvalue,
 785                 void *data,
 786                 void *userdata) {
 787
 788         Network *n = data;
 789         int r;
 790
 791         assert(filename);
 792         assert(lvalue);
 793         assert(rvalue);
 794
 795         for (const char *p = rvalue;;) {
 796                 _cleanup_free_ char *w = NULL, *idna = NULL;
 797
 798                 r = extract_first_word(&p, &w, NULL, 0);
 799                 if (r == -ENOMEM)
 800                         return log_oom();
 801                 if (r < 0) {
 802                         log_syntax(unit, LOG_WARNING, filename, line, r,
 803                                    "Failed to extract word, ignoring: %s", rvalue);
 804                         return 0;
 805                 }
 806                 if (r == 0)
 807                         return 0;
 808
 809                 r = dns_name_apply_idna(w, &idna);
 810                 if (r < 0) {
 811                         log_syntax(unit, LOG_WARNING, filename, line, r,
 812                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
 813                         continue;
 814                 } else if (r == 0)
 815                         /* transfer ownership to simplify subsequent operations */
 816                         idna = TAKE_PTR(w);
 817
 818                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops);
 819                 if (r < 0)
 820                         return log_oom();
 821
 822                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
 823                 if (r < 0)
 824                         return log_oom();
 825         }
 826 }
 827
 828 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
 829         [RADV_PREFIX_DELEGATION_NONE]   = "no",
 830         [RADV_PREFIX_DELEGATION_STATIC] = "static",
 831         [RADV_PREFIX_DELEGATION_DHCP6]  = "dhcpv6",
 832         [RADV_PREFIX_DELEGATION_BOTH]   = "yes",
 833 };
 834
 835 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
 836                 radv_prefix_delegation,
 837                 RADVPrefixDelegation,
 838                 RADV_PREFIX_DELEGATION_BOTH);
 839
 840 DEFINE_CONFIG_PARSE_ENUM(
 841                 config_parse_router_prefix_delegation,
 842                 radv_prefix_delegation,
 843                 RADVPrefixDelegation,
 844                 "Invalid router prefix delegation");
 845
 846 int config_parse_router_preference(
 847                 const char *unit,
 848                 const char *filename,
 849                 unsigned line,
 850                 const char *section,
 851                 unsigned section_line,
 852                 const char *lvalue,
 853                 int ltype,
 854                 const char *rvalue,
 855                 void *data,
 856                 void *userdata) {
 857
 858         Network *network = userdata;
 859
 860         assert(filename);
 861         assert(section);
 862         assert(lvalue);
 863         assert(rvalue);
 864         assert(data);
 865
 866         if (streq(rvalue, "high"))
 867                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
 868         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
 869                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
 870         else if (streq(rvalue, "low"))
 871                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
 872         else
 873                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 874                            "Invalid router preference, ignoring assignment: %s", rvalue);
 875
 876         return 0;
 877 }