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-address.h"
  11 #include "networkd-manager.h"
  12 #include "networkd-radv.h"
  13 #include "parse-util.h"
  14 #include "sd-radv.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,
  52                              unsigned section_line, Prefix **ret) {
  53         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  54         _cleanup_(prefix_freep) Prefix *prefix = NULL;
  55         int r;
  56
  57         assert(network);
  58         assert(ret);
  59         assert(filename);
  60         assert(section_line > 0);
  61
  62         r = network_config_section_new(filename, section_line, &n);
  63         if (r < 0)
  64                 return r;
  65
  66         prefix = hashmap_get(network->prefixes_by_section, n);
  67         if (prefix) {
  68                 *ret = TAKE_PTR(prefix);
  69                 return 0;
  70         }
  71
  72         r = prefix_new(&prefix);
  73         if (r < 0)
  74                 return r;
  75
  76         prefix->network = network;
  77         prefix->section = TAKE_PTR(n);
  78
  79         r = hashmap_ensure_allocated(&network->prefixes_by_section, &network_config_hash_ops);
  80         if (r < 0)
  81                 return r;
  82
  83         r = hashmap_put(network->prefixes_by_section, prefix->section, prefix);
  84         if (r < 0)
  85                 return r;
  86
  87         *ret = TAKE_PTR(prefix);
  88
  89         return 0;
  90 }
  91
  92 RoutePrefix *route_prefix_free(RoutePrefix *prefix) {
  93         if (!prefix)
  94                 return NULL;
  95
  96         if (prefix->network) {
  97                 assert(prefix->section);
  98                 hashmap_remove(prefix->network->route_prefixes_by_section, prefix->section);
  99         }
 100
 101         network_config_section_free(prefix->section);
 102         sd_radv_route_prefix_unref(prefix->radv_route_prefix);
 103
 104         return mfree(prefix);
 105 }
 106
 107 DEFINE_NETWORK_SECTION_FUNCTIONS(RoutePrefix, route_prefix_free);
 108
 109 static int route_prefix_new(RoutePrefix **ret) {
 110         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 111
 112         prefix = new0(RoutePrefix, 1);
 113         if (!prefix)
 114                 return -ENOMEM;
 115
 116         if (sd_radv_route_prefix_new(&prefix->radv_route_prefix) < 0)
 117                 return -ENOMEM;
 118
 119         *ret = TAKE_PTR(prefix);
 120
 121         return 0;
 122 }
 123
 124 static int route_prefix_new_static(Network *network, const char *filename,
 125                                    unsigned section_line, RoutePrefix **ret) {
 126         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
 127         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 128         int r;
 129
 130         assert(network);
 131         assert(ret);
 132         assert(filename);
 133         assert(section_line > 0);
 134
 135         r = network_config_section_new(filename, section_line, &n);
 136         if (r < 0)
 137                 return r;
 138
 139         prefix = hashmap_get(network->route_prefixes_by_section, n);
 140         if (prefix) {
 141                 *ret = TAKE_PTR(prefix);
 142                 return 0;
 143         }
 144
 145         r = route_prefix_new(&prefix);
 146         if (r < 0)
 147                 return r;
 148
 149         prefix->network = network;
 150         prefix->section = TAKE_PTR(n);
 151
 152         r = hashmap_ensure_allocated(&network->route_prefixes_by_section, &network_config_hash_ops);
 153         if (r < 0)
 154                 return r;
 155
 156         r = hashmap_put(network->route_prefixes_by_section, prefix->section, prefix);
 157         if (r < 0)
 158                 return r;
 159
 160         *ret = TAKE_PTR(prefix);
 161
 162         return 0;
 163 }
 164
 165 void network_verify_prefixes(Network *network) {
 166         Prefix *prefix;
 167
 168         assert(network);
 169
 170         HASHMAP_FOREACH(prefix, network->prefixes_by_section)
 171                 if (section_is_invalid(prefix->section))
 172                         prefix_free(prefix);
 173 }
 174
 175 void network_verify_route_prefixes(Network *network) {
 176         RoutePrefix *prefix;
 177
 178         assert(network);
 179
 180         HASHMAP_FOREACH(prefix, network->route_prefixes_by_section)
 181                 if (section_is_invalid(prefix->section))
 182                         route_prefix_free(prefix);
 183 }
 184
 185 int config_parse_prefix(const char *unit,
 186                         const char *filename,
 187                         unsigned line,
 188                         const char *section,
 189                         unsigned section_line,
 190                         const char *lvalue,
 191                         int ltype,
 192                         const char *rvalue,
 193                         void *data,
 194                         void *userdata) {
 195
 196         Network *network = userdata;
 197         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 198         uint8_t prefixlen = 64;
 199         union in_addr_union in6addr;
 200         int r;
 201
 202         assert(filename);
 203         assert(section);
 204         assert(lvalue);
 205         assert(rvalue);
 206         assert(data);
 207
 208         r = prefix_new_static(network, filename, section_line, &p);
 209         if (r < 0)
 210                 return log_oom();
 211
 212         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 213         if (r < 0) {
 214                 log_syntax(unit, LOG_WARNING, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
 215                 return 0;
 216         }
 217
 218         r = sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen);
 219         if (r < 0) {
 220                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set radv prefix, ignoring assignment: %s", rvalue);
 221                 return 0;
 222         }
 223
 224         p = NULL;
 225
 226         return 0;
 227 }
 228
 229 int config_parse_prefix_flags(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         Network *network = userdata;
 240         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 241         int r;
 242
 243         assert(filename);
 244         assert(section);
 245         assert(lvalue);
 246         assert(rvalue);
 247         assert(data);
 248
 249         r = prefix_new_static(network, filename, section_line, &p);
 250         if (r < 0)
 251                 return log_oom();
 252
 253         r = parse_boolean(rvalue);
 254         if (r < 0) {
 255                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
 256                 return 0;
 257         }
 258
 259         if (streq(lvalue, "OnLink"))
 260                 r = sd_radv_prefix_set_onlink(p->radv_prefix, r);
 261         else if (streq(lvalue, "AddressAutoconfiguration"))
 262                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, r);
 263         if (r < 0) {
 264                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set %s=, ignoring assignment: %m", lvalue);
 265                 return 0;
 266         }
 267
 268         p = NULL;
 269
 270         return 0;
 271 }
 272
 273 int config_parse_prefix_lifetime(const char *unit,
 274                                  const char *filename,
 275                                  unsigned line,
 276                                  const char *section,
 277                                  unsigned section_line,
 278                                  const char *lvalue,
 279                                  int ltype,
 280                                  const char *rvalue,
 281                                  void *data,
 282                                  void *userdata) {
 283         Network *network = userdata;
 284         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 285         usec_t usec;
 286         int r;
 287
 288         assert(filename);
 289         assert(section);
 290         assert(lvalue);
 291         assert(rvalue);
 292         assert(data);
 293
 294         r = prefix_new_static(network, filename, section_line, &p);
 295         if (r < 0)
 296                 return log_oom();
 297
 298         r = parse_sec(rvalue, &usec);
 299         if (r < 0) {
 300                 log_syntax(unit, LOG_WARNING, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
 301                 return 0;
 302         }
 303
 304         /* a value of 0xffffffff represents infinity */
 305         if (streq(lvalue, "PreferredLifetimeSec"))
 306                 r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
 307                                                           DIV_ROUND_UP(usec, USEC_PER_SEC));
 308         else if (streq(lvalue, "ValidLifetimeSec"))
 309                 r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
 310                                                       DIV_ROUND_UP(usec, USEC_PER_SEC));
 311         if (r < 0) {
 312                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set %s=, ignoring assignment: %m", lvalue);
 313                 return 0;
 314         }
 315
 316         p = NULL;
 317
 318         return 0;
 319 }
 320
 321 int config_parse_prefix_assign(
 322                 const char *unit,
 323                 const char *filename,
 324                 unsigned line,
 325                 const char *section,
 326                 unsigned section_line,
 327                 const char *lvalue,
 328                 int ltype,
 329                 const char *rvalue,
 330                 void *data,
 331                 void *userdata) {
 332
 333         Network *network = userdata;
 334         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 335         int r;
 336
 337         assert(filename);
 338         assert(section);
 339         assert(lvalue);
 340         assert(rvalue);
 341         assert(data);
 342
 343         r = prefix_new_static(network, filename, section_line, &p);
 344         if (r < 0)
 345                 return log_oom();
 346
 347         r = parse_boolean(rvalue);
 348         if (r < 0) {
 349                 log_syntax(unit, LOG_WARNING, filename, line, r,
 350                            "Failed to parse %s=, ignoring assignment: %s",
 351                            lvalue, rvalue);
 352                 return 0;
 353         }
 354
 355         p->assign = r;
 356         p = NULL;
 357
 358         return 0;
 359 }
 360
 361 int config_parse_route_prefix(const char *unit,
 362                               const char *filename,
 363                               unsigned line,
 364                               const char *section,
 365                               unsigned section_line,
 366                               const char *lvalue,
 367                               int ltype,
 368                               const char *rvalue,
 369                               void *data,
 370                               void *userdata) {
 371
 372         Network *network = userdata;
 373         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
 374         uint8_t prefixlen = 64;
 375         union in_addr_union in6addr;
 376         int r;
 377
 378         assert(filename);
 379         assert(section);
 380         assert(lvalue);
 381         assert(rvalue);
 382         assert(data);
 383
 384         r = route_prefix_new_static(network, filename, section_line, &p);
 385         if (r < 0)
 386                 return log_oom();
 387
 388         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 389         if (r < 0) {
 390                 log_syntax(unit, LOG_WARNING, filename, line, r, "Route prefix is invalid, ignoring assignment: %s", rvalue);
 391                 return 0;
 392         }
 393
 394         r = sd_radv_prefix_set_route_prefix(p->radv_route_prefix, &in6addr.in6, prefixlen);
 395         if (r < 0) {
 396                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set route prefix, ignoring assignment: %m");
 397                 return 0;
 398         }
 399
 400         p = NULL;
 401
 402         return 0;
 403 }
 404
 405 int config_parse_route_prefix_lifetime(const char *unit,
 406                                        const char *filename,
 407                                        unsigned line,
 408                                        const char *section,
 409                                        unsigned section_line,
 410                                        const char *lvalue,
 411                                        int ltype,
 412                                        const char *rvalue,
 413                                        void *data,
 414                                        void *userdata) {
 415         Network *network = userdata;
 416         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
 417         usec_t usec;
 418         int r;
 419
 420         assert(filename);
 421         assert(section);
 422         assert(lvalue);
 423         assert(rvalue);
 424         assert(data);
 425
 426         r = route_prefix_new_static(network, filename, section_line, &p);
 427         if (r < 0)
 428                 return log_oom();
 429
 430         r = parse_sec(rvalue, &usec);
 431         if (r < 0) {
 432                 log_syntax(unit, LOG_WARNING, filename, line, r,
 433                            "Route lifetime is invalid, ignoring assignment: %s", rvalue);
 434                 return 0;
 435         }
 436
 437         /* a value of 0xffffffff represents infinity */
 438         r = sd_radv_route_prefix_set_lifetime(p->radv_route_prefix, DIV_ROUND_UP(usec, USEC_PER_SEC));
 439         if (r < 0) {
 440                 log_syntax(unit, LOG_WARNING, filename, line, r,
 441                            "Failed to set route lifetime, ignoring assignment: %m");
 442                 return 0;
 443         }
 444
 445         p = NULL;
 446
 447         return 0;
 448 }
 449
 450 static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
 451                            size_t *n_dns) {
 452         _cleanup_free_ struct in6_addr *addresses = NULL;
 453         size_t i, n_addresses = 0, n_allocated = 0;
 454
 455         assert(network);
 456         assert(dns);
 457         assert(n_dns);
 458
 459         for (i = 0; i < network->n_dns; i++) {
 460                 union in_addr_union *addr;
 461
 462                 if (network->dns[i]->family != AF_INET6)
 463                         continue;
 464
 465                 addr = &network->dns[i]->address;
 466
 467                 if (in_addr_is_null(AF_INET6, addr) ||
 468                     in_addr_is_link_local(AF_INET6, addr) ||
 469                     in_addr_is_localhost(AF_INET6, addr))
 470                         continue;
 471
 472                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 473                         return -ENOMEM;
 474
 475                 addresses[n_addresses++] = addr->in6;
 476         }
 477
 478         if (addresses) {
 479                 *dns = TAKE_PTR(addresses);
 480
 481                 *n_dns = n_addresses;
 482         }
 483
 484         return n_addresses;
 485 }
 486
 487 static int radv_set_dns(Link *link, Link *uplink) {
 488         _cleanup_free_ struct in6_addr *dns = NULL;
 489         usec_t lifetime_usec;
 490         size_t n_dns;
 491         int r;
 492
 493         if (!link->network->router_emit_dns)
 494                 return 0;
 495
 496         if (link->network->router_dns) {
 497                 struct in6_addr *p;
 498
 499                 dns = new(struct in6_addr, link->network->n_router_dns);
 500                 if (!dns)
 501                         return -ENOMEM;
 502
 503                 p = dns;
 504                 for (size_t i = 0; i < link->network->n_router_dns; i++)
 505                         if (IN6_IS_ADDR_UNSPECIFIED(&link->network->router_dns[i])) {
 506                                 if (!IN6_IS_ADDR_UNSPECIFIED(&link->ipv6ll_address))
 507                                         *(p++) = link->ipv6ll_address;
 508                         } else
 509                                 *(p++) = link->network->router_dns[i];
 510
 511                 n_dns = p - dns;
 512                 lifetime_usec = link->network->router_dns_lifetime_usec;
 513
 514                 goto set_dns;
 515         }
 516
 517         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 518
 519         r = radv_get_ip6dns(link->network, &dns, &n_dns);
 520         if (r > 0)
 521                 goto set_dns;
 522
 523         if (uplink) {
 524                 if (!uplink->network) {
 525                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 526                         return 0;
 527                 }
 528
 529                 r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
 530                 if (r > 0)
 531                         goto set_dns;
 532         }
 533
 534         return 0;
 535
 536  set_dns:
 537         return sd_radv_set_rdnss(link->radv,
 538                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 539                                  dns, n_dns);
 540 }
 541
 542 static int radv_set_domains(Link *link, Link *uplink) {
 543         OrderedSet *search_domains;
 544         usec_t lifetime_usec;
 545         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 546
 547         if (!link->network->router_emit_domains)
 548                 return 0;
 549
 550         search_domains = link->network->router_search_domains;
 551         lifetime_usec = link->network->router_dns_lifetime_usec;
 552
 553         if (search_domains)
 554                 goto set_domains;
 555
 556         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 557
 558         search_domains = link->network->search_domains;
 559         if (search_domains)
 560                 goto set_domains;
 561
 562         if (uplink) {
 563                 if (!uplink->network) {
 564                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 565                         return 0;
 566                 }
 567
 568                 search_domains = uplink->network->search_domains;
 569                 if (search_domains)
 570                         goto set_domains;
 571         }
 572
 573         return 0;
 574
 575  set_domains:
 576         s = ordered_set_get_strv(search_domains);
 577         if (!s)
 578                 return log_oom();
 579
 580         return sd_radv_set_dnssl(link->radv,
 581                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 582                                  s);
 583
 584 }
 585
 586 int radv_emit_dns(Link *link) {
 587         Link *uplink;
 588         int r;
 589
 590         uplink = manager_find_uplink(link->manager, link);
 591
 592         r = radv_set_dns(link, uplink);
 593         if (r < 0)
 594                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 595
 596         r = radv_set_domains(link, uplink);
 597         if (r < 0)
 598                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 599
 600         return 0;
 601 }
 602
 603 int radv_configure(Link *link) {
 604         int r;
 605
 606         assert(link);
 607         assert(link->network);
 608
 609         r = sd_radv_new(&link->radv);
 610         if (r < 0)
 611                 return r;
 612
 613         r = sd_radv_attach_event(link->radv, NULL, 0);
 614         if (r < 0)
 615                 return r;
 616
 617         r = sd_radv_set_mac(link->radv, &link->mac);
 618         if (r < 0)
 619                 return r;
 620
 621         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 622         if (r < 0)
 623                 return r;
 624
 625         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 626         if (r < 0)
 627                 return r;
 628
 629         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 630         if (r < 0)
 631                 return r;
 632
 633         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 634            not a router */
 635         r = sd_radv_set_router_lifetime(link->radv,
 636                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 637         if (r < 0)
 638                 return r;
 639
 640         if (link->network->router_lifetime_usec > 0) {
 641                 r = sd_radv_set_preference(link->radv,
 642                                            link->network->router_preference);
 643                 if (r < 0)
 644                         return r;
 645         }
 646
 647         if (link->network->router_prefix_delegation & RADV_PREFIX_DELEGATION_STATIC) {
 648                 RoutePrefix *q;
 649                 Prefix *p;
 650
 651                 HASHMAP_FOREACH(p, link->network->prefixes_by_section) {
 652                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 653                         if (r == -EEXIST)
 654                                 continue;
 655                         if (r == -ENOEXEC) {
 656                                 log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section.");
 657                                 continue;
 658                         }
 659                         if (r < 0)
 660                                 return r;
 661                 }
 662
 663                 HASHMAP_FOREACH(q, link->network->route_prefixes_by_section) {
 664                         r = sd_radv_add_route_prefix(link->radv, q->radv_route_prefix, false);
 665                         if (r == -EEXIST)
 666                                 continue;
 667                         if (r < 0)
 668                                 return r;
 669                 }
 670         }
 671
 672         return 0;
 673 }
 674
 675 int radv_add_prefix(Link *link, const struct in6_addr *prefix, uint8_t prefix_len,
 676                     uint32_t lifetime_preferred, uint32_t lifetime_valid) {
 677         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 678         int r;
 679
 680         assert(link);
 681
 682         if (!link->radv)
 683                 return 0;
 684
 685         r = sd_radv_prefix_new(&p);
 686         if (r < 0)
 687                 return r;
 688
 689         r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
 690         if (r < 0)
 691                 return r;
 692
 693         r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred);
 694         if (r < 0)
 695                 return r;
 696
 697         r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid);
 698         if (r < 0)
 699                 return r;
 700
 701         r = sd_radv_add_prefix(link->radv, p, true);
 702         if (r < 0 && r != -EEXIST)
 703                 return r;
 704
 705         return 0;
 706 }
 707
 708 int config_parse_radv_dns(
 709                 const char *unit,
 710                 const char *filename,
 711                 unsigned line,
 712                 const char *section,
 713                 unsigned section_line,
 714                 const char *lvalue,
 715                 int ltype,
 716                 const char *rvalue,
 717                 void *data,
 718                 void *userdata) {
 719
 720         Network *n = data;
 721         int r;
 722
 723         assert(filename);
 724         assert(lvalue);
 725         assert(rvalue);
 726
 727         for (const char *p = rvalue;;) {
 728                 _cleanup_free_ char *w = NULL;
 729                 union in_addr_union a;
 730
 731                 r = extract_first_word(&p, &w, NULL, 0);
 732                 if (r == -ENOMEM)
 733                         return log_oom();
 734                 if (r < 0) {
 735                         log_syntax(unit, LOG_WARNING, filename, line, r,
 736                                    "Failed to extract word, ignoring: %s", rvalue);
 737                         return 0;
 738                 }
 739                 if (r == 0)
 740                         return 0;
 741
 742                 if (streq(w, "_link_local"))
 743                         a = IN_ADDR_NULL;
 744                 else {
 745                         r = in_addr_from_string(AF_INET6, w, &a);
 746                         if (r < 0) {
 747                                 log_syntax(unit, LOG_WARNING, filename, line, r,
 748                                            "Failed to parse DNS server address, ignoring: %s", w);
 749                                 continue;
 750                         }
 751
 752                         if (in_addr_is_null(AF_INET6, &a)) {
 753                                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 754                                            "DNS server address is null, ignoring: %s", w);
 755                                 continue;
 756                         }
 757                 }
 758
 759                 struct in6_addr *m;
 760                 m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
 761                 if (!m)
 762                         return log_oom();
 763
 764                 m[n->n_router_dns++] = a.in6;
 765                 n->router_dns = m;
 766         }
 767 }
 768
 769 int config_parse_radv_search_domains(
 770                 const char *unit,
 771                 const char *filename,
 772                 unsigned line,
 773                 const char *section,
 774                 unsigned section_line,
 775                 const char *lvalue,
 776                 int ltype,
 777                 const char *rvalue,
 778                 void *data,
 779                 void *userdata) {
 780
 781         Network *n = data;
 782         int r;
 783
 784         assert(filename);
 785         assert(lvalue);
 786         assert(rvalue);
 787
 788         for (const char *p = rvalue;;) {
 789                 _cleanup_free_ char *w = NULL, *idna = NULL;
 790
 791                 r = extract_first_word(&p, &w, NULL, 0);
 792                 if (r == -ENOMEM)
 793                         return log_oom();
 794                 if (r < 0) {
 795                         log_syntax(unit, LOG_WARNING, filename, line, r,
 796                                    "Failed to extract word, ignoring: %s", rvalue);
 797                         return 0;
 798                 }
 799                 if (r == 0)
 800                         return 0;
 801
 802                 r = dns_name_apply_idna(w, &idna);
 803                 if (r < 0) {
 804                         log_syntax(unit, LOG_WARNING, filename, line, r,
 805                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
 806                         continue;
 807                 } else if (r == 0)
 808                         /* transfer ownership to simplify subsequent operations */
 809                         idna = TAKE_PTR(w);
 810
 811                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops);
 812                 if (r < 0)
 813                         return log_oom();
 814
 815                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
 816                 if (r < 0)
 817                         return log_oom();
 818         }
 819 }
 820
 821 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
 822         [RADV_PREFIX_DELEGATION_NONE] = "no",
 823         [RADV_PREFIX_DELEGATION_STATIC] = "static",
 824         [RADV_PREFIX_DELEGATION_DHCP6] = "dhcpv6",
 825         [RADV_PREFIX_DELEGATION_BOTH] = "yes",
 826 };
 827
 828 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
 829                 radv_prefix_delegation,
 830                 RADVPrefixDelegation,
 831                 RADV_PREFIX_DELEGATION_BOTH);
 832
 833 DEFINE_CONFIG_PARSE_ENUM(config_parse_router_prefix_delegation,
 834                          radv_prefix_delegation,
 835                          RADVPrefixDelegation,
 836                          "Invalid router prefix delegation");
 837
 838 int config_parse_router_preference(const char *unit,
 839                                    const char *filename,
 840                                    unsigned line,
 841                                    const char *section,
 842                                    unsigned section_line,
 843                                    const char *lvalue,
 844                                    int ltype,
 845                                    const char *rvalue,
 846                                    void *data,
 847                                    void *userdata) {
 848         Network *network = userdata;
 849
 850         assert(filename);
 851         assert(section);
 852         assert(lvalue);
 853         assert(rvalue);
 854         assert(data);
 855
 856         if (streq(rvalue, "high"))
 857                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
 858         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
 859                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
 860         else if (streq(rvalue, "low"))
 861                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
 862         else
 863                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 864                            "Invalid router preference, ignoring assignment: %s", rvalue);
 865
 866         return 0;
 867 }