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 void prefix_free(Prefix *prefix) {
  20         if (!prefix)
  21                 return;
  22
  23         if (prefix->network) {
  24                 LIST_REMOVE(prefixes, prefix->network->static_prefixes, prefix);
  25                 assert(prefix->network->n_static_prefixes > 0);
  26                 prefix->network->n_static_prefixes--;
  27
  28                 if (prefix->section)
  29                         hashmap_remove(prefix->network->prefixes_by_section,
  30                                        prefix->section);
  31         }
  32
  33         network_config_section_free(prefix->section);
  34         sd_radv_prefix_unref(prefix->radv_prefix);
  35
  36         free(prefix);
  37 }
  38
  39 static int prefix_new(Prefix **ret) {
  40         _cleanup_(prefix_freep) Prefix *prefix = NULL;
  41
  42         prefix = new0(Prefix, 1);
  43         if (!prefix)
  44                 return -ENOMEM;
  45
  46         if (sd_radv_prefix_new(&prefix->radv_prefix) < 0)
  47                 return -ENOMEM;
  48
  49         *ret = TAKE_PTR(prefix);
  50
  51         return 0;
  52 }
  53
  54 static int prefix_new_static(Network *network, const char *filename,
  55                              unsigned section_line, Prefix **ret) {
  56         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  57         _cleanup_(prefix_freep) Prefix *prefix = NULL;
  58         int r;
  59
  60         assert(network);
  61         assert(ret);
  62         assert(!!filename == (section_line > 0));
  63
  64         if (filename) {
  65                 r = network_config_section_new(filename, section_line, &n);
  66                 if (r < 0)
  67                         return r;
  68
  69                 if (section_line) {
  70                         prefix = hashmap_get(network->prefixes_by_section, n);
  71                         if (prefix) {
  72                                 *ret = TAKE_PTR(prefix);
  73
  74                                 return 0;
  75                         }
  76                 }
  77         }
  78
  79         r = prefix_new(&prefix);
  80         if (r < 0)
  81                 return r;
  82
  83         prefix->network = network;
  84         LIST_APPEND(prefixes, network->static_prefixes, prefix);
  85         network->n_static_prefixes++;
  86
  87         if (filename) {
  88                 prefix->section = TAKE_PTR(n);
  89
  90                 r = hashmap_ensure_allocated(&network->prefixes_by_section, &network_config_hash_ops);
  91                 if (r < 0)
  92                         return r;
  93
  94                 r = hashmap_put(network->prefixes_by_section, prefix->section, prefix);
  95                 if (r < 0)
  96                         return r;
  97         }
  98
  99         *ret = TAKE_PTR(prefix);
 100
 101         return 0;
 102 }
 103
 104 static int route_prefix_new(RoutePrefix **ret) {
 105         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 106
 107         prefix = new0(RoutePrefix, 1);
 108         if (!prefix)
 109                 return -ENOMEM;
 110
 111         if (sd_radv_route_prefix_new(&prefix->radv_route_prefix) < 0)
 112                 return -ENOMEM;
 113
 114         *ret = TAKE_PTR(prefix);
 115
 116         return 0;
 117 }
 118
 119 void route_prefix_free(RoutePrefix *prefix) {
 120         if (!prefix)
 121                 return;
 122
 123         if (prefix->network) {
 124                 LIST_REMOVE(route_prefixes, prefix->network->static_route_prefixes, prefix);
 125                 assert(prefix->network->n_static_route_prefixes > 0);
 126                 prefix->network->n_static_route_prefixes--;
 127
 128                 if (prefix->section)
 129                         hashmap_remove(prefix->network->route_prefixes_by_section,
 130                                        prefix->section);
 131         }
 132
 133         network_config_section_free(prefix->section);
 134         sd_radv_route_prefix_unref(prefix->radv_route_prefix);
 135
 136         free(prefix);
 137 }
 138
 139 static int route_prefix_new_static(Network *network, const char *filename,
 140                                    unsigned section_line, RoutePrefix **ret) {
 141         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
 142         _cleanup_(route_prefix_freep) RoutePrefix *prefix = NULL;
 143         int r;
 144
 145         assert(network);
 146         assert(ret);
 147         assert(!!filename == (section_line > 0));
 148
 149         if (filename) {
 150                 r = network_config_section_new(filename, section_line, &n);
 151                 if (r < 0)
 152                         return r;
 153
 154                 if (section_line) {
 155                         prefix = hashmap_get(network->route_prefixes_by_section, n);
 156                         if (prefix) {
 157                                 *ret = TAKE_PTR(prefix);
 158
 159                                 return 0;
 160                         }
 161                 }
 162         }
 163
 164         r = route_prefix_new(&prefix);
 165         if (r < 0)
 166                 return r;
 167
 168         prefix->network = network;
 169         LIST_APPEND(route_prefixes, network->static_route_prefixes, prefix);
 170         network->n_static_route_prefixes++;
 171
 172         if (filename) {
 173                 prefix->section = TAKE_PTR(n);
 174
 175                 r = hashmap_ensure_allocated(&network->route_prefixes_by_section, &network_config_hash_ops);
 176                 if (r < 0)
 177                         return r;
 178
 179                 r = hashmap_put(network->route_prefixes_by_section, prefix->section, prefix);
 180                 if (r < 0)
 181                         return r;
 182         }
 183
 184         *ret = TAKE_PTR(prefix);
 185
 186         return 0;
 187 }
 188
 189 int config_parse_prefix(const char *unit,
 190                         const char *filename,
 191                         unsigned line,
 192                         const char *section,
 193                         unsigned section_line,
 194                         const char *lvalue,
 195                         int ltype,
 196                         const char *rvalue,
 197                         void *data,
 198                         void *userdata) {
 199
 200         Network *network = userdata;
 201         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 202         uint8_t prefixlen = 64;
 203         union in_addr_union in6addr;
 204         int r;
 205
 206         assert(filename);
 207         assert(section);
 208         assert(lvalue);
 209         assert(rvalue);
 210         assert(data);
 211
 212         r = prefix_new_static(network, filename, section_line, &p);
 213         if (r < 0)
 214                 return log_oom();
 215
 216         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 217         if (r < 0) {
 218                 log_syntax(unit, LOG_WARNING, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
 219                 return 0;
 220         }
 221
 222         r = sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen);
 223         if (r < 0) {
 224                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set radv prefix, ignoring assignment: %s", rvalue);
 225                 return 0;
 226         }
 227
 228         p = NULL;
 229
 230         return 0;
 231 }
 232
 233 int config_parse_prefix_flags(const char *unit,
 234                               const char *filename,
 235                               unsigned line,
 236                               const char *section,
 237                               unsigned section_line,
 238                               const char *lvalue,
 239                               int ltype,
 240                               const char *rvalue,
 241                               void *data,
 242                               void *userdata) {
 243         Network *network = userdata;
 244         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 245         int r;
 246
 247         assert(filename);
 248         assert(section);
 249         assert(lvalue);
 250         assert(rvalue);
 251         assert(data);
 252
 253         r = prefix_new_static(network, filename, section_line, &p);
 254         if (r < 0)
 255                 return log_oom();
 256
 257         r = parse_boolean(rvalue);
 258         if (r < 0) {
 259                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse %s=, ignoring assignment: %s", lvalue, rvalue);
 260                 return 0;
 261         }
 262
 263         if (streq(lvalue, "OnLink"))
 264                 r = sd_radv_prefix_set_onlink(p->radv_prefix, r);
 265         else if (streq(lvalue, "AddressAutoconfiguration"))
 266                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, r);
 267         if (r < 0) {
 268                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set %s=, ignoring assignment: %m", lvalue);
 269                 return 0;
 270         }
 271
 272         p = NULL;
 273
 274         return 0;
 275 }
 276
 277 int config_parse_prefix_lifetime(const char *unit,
 278                                  const char *filename,
 279                                  unsigned line,
 280                                  const char *section,
 281                                  unsigned section_line,
 282                                  const char *lvalue,
 283                                  int ltype,
 284                                  const char *rvalue,
 285                                  void *data,
 286                                  void *userdata) {
 287         Network *network = userdata;
 288         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 289         usec_t usec;
 290         int r;
 291
 292         assert(filename);
 293         assert(section);
 294         assert(lvalue);
 295         assert(rvalue);
 296         assert(data);
 297
 298         r = prefix_new_static(network, filename, section_line, &p);
 299         if (r < 0)
 300                 return log_oom();
 301
 302         r = parse_sec(rvalue, &usec);
 303         if (r < 0) {
 304                 log_syntax(unit, LOG_WARNING, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
 305                 return 0;
 306         }
 307
 308         /* a value of 0xffffffff represents infinity */
 309         if (streq(lvalue, "PreferredLifetimeSec"))
 310                 r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
 311                                                           DIV_ROUND_UP(usec, USEC_PER_SEC));
 312         else if (streq(lvalue, "ValidLifetimeSec"))
 313                 r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
 314                                                       DIV_ROUND_UP(usec, USEC_PER_SEC));
 315         if (r < 0) {
 316                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to set %s=, ignoring assignment: %m", lvalue);
 317                 return 0;
 318         }
 319
 320         p = NULL;
 321
 322         return 0;
 323 }
 324
 325 int config_parse_prefix_assign(
 326                 const char *unit,
 327                 const char *filename,
 328                 unsigned line,
 329                 const char *section,
 330                 unsigned section_line,
 331                 const char *lvalue,
 332                 int ltype,
 333                 const char *rvalue,
 334                 void *data,
 335                 void *userdata) {
 336
 337         Network *network = userdata;
 338         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 339         int r;
 340
 341         assert(filename);
 342         assert(section);
 343         assert(lvalue);
 344         assert(rvalue);
 345         assert(data);
 346
 347         r = prefix_new_static(network, filename, section_line, &p);
 348         if (r < 0)
 349                 return log_oom();
 350
 351         r = parse_boolean(rvalue);
 352         if (r < 0) {
 353                 log_syntax(unit, LOG_WARNING, filename, line, r,
 354                            "Failed to parse %s=, ignoring assignment: %s",
 355                            lvalue, rvalue);
 356                 return 0;
 357         }
 358
 359         p->assign = r;
 360         p = NULL;
 361
 362         return 0;
 363 }
 364
 365 int config_parse_route_prefix(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(const char *unit,
 410                                        const char *filename,
 411                                        unsigned line,
 412                                        const char *section,
 413                                        unsigned section_line,
 414                                        const char *lvalue,
 415                                        int ltype,
 416                                        const char *rvalue,
 417                                        void *data,
 418                                        void *userdata) {
 419         Network *network = userdata;
 420         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
 421         usec_t usec;
 422         int r;
 423
 424         assert(filename);
 425         assert(section);
 426         assert(lvalue);
 427         assert(rvalue);
 428         assert(data);
 429
 430         r = route_prefix_new_static(network, filename, section_line, &p);
 431         if (r < 0)
 432                 return log_oom();
 433
 434         r = parse_sec(rvalue, &usec);
 435         if (r < 0) {
 436                 log_syntax(unit, LOG_WARNING, filename, line, r,
 437                            "Route lifetime is invalid, ignoring assignment: %s", rvalue);
 438                 return 0;
 439         }
 440
 441         /* a value of 0xffffffff represents infinity */
 442         r = sd_radv_route_prefix_set_lifetime(p->radv_route_prefix, DIV_ROUND_UP(usec, USEC_PER_SEC));
 443         if (r < 0) {
 444                 log_syntax(unit, LOG_WARNING, filename, line, r,
 445                            "Failed to set route lifetime, ignoring assignment: %m");
 446                 return 0;
 447         }
 448
 449         p = NULL;
 450
 451         return 0;
 452 }
 453
 454 static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
 455                            size_t *n_dns) {
 456         _cleanup_free_ struct in6_addr *addresses = NULL;
 457         size_t i, n_addresses = 0, n_allocated = 0;
 458
 459         assert(network);
 460         assert(dns);
 461         assert(n_dns);
 462
 463         for (i = 0; i < network->n_dns; i++) {
 464                 union in_addr_union *addr;
 465
 466                 if (network->dns[i]->family != AF_INET6)
 467                         continue;
 468
 469                 addr = &network->dns[i]->address;
 470
 471                 if (in_addr_is_null(AF_INET6, addr) ||
 472                     in_addr_is_link_local(AF_INET6, addr) ||
 473                     in_addr_is_localhost(AF_INET6, addr))
 474                         continue;
 475
 476                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 477                         return -ENOMEM;
 478
 479                 addresses[n_addresses++] = addr->in6;
 480         }
 481
 482         if (addresses) {
 483                 *dns = TAKE_PTR(addresses);
 484
 485                 *n_dns = n_addresses;
 486         }
 487
 488         return n_addresses;
 489 }
 490
 491 static int radv_set_dns(Link *link, Link *uplink) {
 492         _cleanup_free_ struct in6_addr *dns = NULL;
 493         usec_t lifetime_usec;
 494         size_t n_dns;
 495         int r;
 496
 497         if (!link->network->router_emit_dns)
 498                 return 0;
 499
 500         if (link->network->router_dns) {
 501                 struct in6_addr *p;
 502
 503                 dns = new(struct in6_addr, link->network->n_router_dns);
 504                 if (!dns)
 505                         return -ENOMEM;
 506
 507                 p = dns;
 508                 for (size_t i = 0; i < link->network->n_router_dns; i++)
 509                         if (IN6_IS_ADDR_UNSPECIFIED(&link->network->router_dns[i])) {
 510                                 if (!IN6_IS_ADDR_UNSPECIFIED(&link->ipv6ll_address))
 511                                         *(p++) = link->ipv6ll_address;
 512                         } else
 513                                 *(p++) = link->network->router_dns[i];
 514
 515                 n_dns = p - dns;
 516                 lifetime_usec = link->network->router_dns_lifetime_usec;
 517
 518                 goto set_dns;
 519         }
 520
 521         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 522
 523         r = radv_get_ip6dns(link->network, &dns, &n_dns);
 524         if (r > 0)
 525                 goto set_dns;
 526
 527         if (uplink) {
 528                 if (!uplink->network) {
 529                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 530                         return 0;
 531                 }
 532
 533                 r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
 534                 if (r > 0)
 535                         goto set_dns;
 536         }
 537
 538         return 0;
 539
 540  set_dns:
 541         return sd_radv_set_rdnss(link->radv,
 542                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 543                                  dns, n_dns);
 544 }
 545
 546 static int radv_set_domains(Link *link, Link *uplink) {
 547         OrderedSet *search_domains;
 548         usec_t lifetime_usec;
 549         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 550
 551         if (!link->network->router_emit_domains)
 552                 return 0;
 553
 554         search_domains = link->network->router_search_domains;
 555         lifetime_usec = link->network->router_dns_lifetime_usec;
 556
 557         if (search_domains)
 558                 goto set_domains;
 559
 560         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 561
 562         search_domains = link->network->search_domains;
 563         if (search_domains)
 564                 goto set_domains;
 565
 566         if (uplink) {
 567                 if (!uplink->network) {
 568                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 569                         return 0;
 570                 }
 571
 572                 search_domains = uplink->network->search_domains;
 573                 if (search_domains)
 574                         goto set_domains;
 575         }
 576
 577         return 0;
 578
 579  set_domains:
 580         s = ordered_set_get_strv(search_domains);
 581         if (!s)
 582                 return log_oom();
 583
 584         return sd_radv_set_dnssl(link->radv,
 585                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 586                                  s);
 587
 588 }
 589
 590 int radv_emit_dns(Link *link) {
 591         Link *uplink;
 592         int r;
 593
 594         uplink = manager_find_uplink(link->manager, link);
 595
 596         r = radv_set_dns(link, uplink);
 597         if (r < 0)
 598                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 599
 600         r = radv_set_domains(link, uplink);
 601         if (r < 0)
 602                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 603
 604         return 0;
 605 }
 606
 607 int radv_configure(Link *link) {
 608         RoutePrefix *q;
 609         Prefix *p;
 610         int r;
 611
 612         assert(link);
 613         assert(link->network);
 614
 615         r = sd_radv_new(&link->radv);
 616         if (r < 0)
 617                 return r;
 618
 619         r = sd_radv_attach_event(link->radv, NULL, 0);
 620         if (r < 0)
 621                 return r;
 622
 623         r = sd_radv_set_mac(link->radv, &link->mac);
 624         if (r < 0)
 625                 return r;
 626
 627         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 628         if (r < 0)
 629                 return r;
 630
 631         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 632         if (r < 0)
 633                 return r;
 634
 635         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 636         if (r < 0)
 637                 return r;
 638
 639         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 640            not a router */
 641         r = sd_radv_set_router_lifetime(link->radv,
 642                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 643         if (r < 0)
 644                 return r;
 645
 646         if (link->network->router_lifetime_usec > 0) {
 647                 r = sd_radv_set_preference(link->radv,
 648                                            link->network->router_preference);
 649                 if (r < 0)
 650                         return r;
 651         }
 652
 653         if (link->network->router_prefix_delegation & RADV_PREFIX_DELEGATION_STATIC) {
 654                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
 655                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 656                         if (r == -EEXIST)
 657                                 continue;
 658                         if (r == -ENOEXEC) {
 659                                 log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section.");
 660                                 continue;
 661                         }
 662                         if (r < 0)
 663                                 return r;
 664                 }
 665
 666                 LIST_FOREACH(route_prefixes, q, link->network->static_route_prefixes) {
 667                         r = sd_radv_add_route_prefix(link->radv, q->radv_route_prefix, false);
 668                         if (r == -EEXIST)
 669                                 continue;
 670                         if (r < 0)
 671                                 return r;
 672                 }
 673         }
 674
 675         return 0;
 676 }
 677
 678 int radv_add_prefix(Link *link, const struct in6_addr *prefix, uint8_t prefix_len,
 679                     uint32_t lifetime_preferred, uint32_t lifetime_valid) {
 680         _cleanup_(sd_radv_prefix_unrefp) sd_radv_prefix *p = NULL;
 681         int r;
 682
 683         assert(link);
 684         assert(link->radv);
 685
 686         r = sd_radv_prefix_new(&p);
 687         if (r < 0)
 688                 return r;
 689
 690         r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
 691         if (r < 0)
 692                 return r;
 693
 694         r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred);
 695         if (r < 0)
 696                 return r;
 697
 698         r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid);
 699         if (r < 0)
 700                 return r;
 701
 702         r = sd_radv_add_prefix(link->radv, p, true);
 703         if (r < 0 && r != -EEXIST)
 704                 return r;
 705
 706         return 0;
 707 }
 708
 709 int config_parse_radv_dns(
 710                 const char *unit,
 711                 const char *filename,
 712                 unsigned line,
 713                 const char *section,
 714                 unsigned section_line,
 715                 const char *lvalue,
 716                 int ltype,
 717                 const char *rvalue,
 718                 void *data,
 719                 void *userdata) {
 720
 721         Network *n = data;
 722         int r;
 723
 724         assert(filename);
 725         assert(lvalue);
 726         assert(rvalue);
 727
 728         for (const char *p = rvalue;;) {
 729                 _cleanup_free_ char *w = NULL;
 730                 union in_addr_union a;
 731
 732                 r = extract_first_word(&p, &w, NULL, 0);
 733                 if (r == -ENOMEM)
 734                         return log_oom();
 735                 if (r < 0) {
 736                         log_syntax(unit, LOG_WARNING, filename, line, r,
 737                                    "Failed to extract word, ignoring: %s", rvalue);
 738                         return 0;
 739                 }
 740                 if (r == 0)
 741                         return 0;
 742
 743                 if (streq(w, "_link_local"))
 744                         a = IN_ADDR_NULL;
 745                 else {
 746                         r = in_addr_from_string(AF_INET6, w, &a);
 747                         if (r < 0) {
 748                                 log_syntax(unit, LOG_WARNING, filename, line, r,
 749                                            "Failed to parse DNS server address, ignoring: %s", w);
 750                                 continue;
 751                         }
 752
 753                         if (in_addr_is_null(AF_INET6, &a)) {
 754                                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 755                                            "DNS server address is null, ignoring: %s", w);
 756                                 continue;
 757                         }
 758                 }
 759
 760                 struct in6_addr *m;
 761                 m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
 762                 if (!m)
 763                         return log_oom();
 764
 765                 m[n->n_router_dns++] = a.in6;
 766                 n->router_dns = m;
 767         }
 768 }
 769
 770 int config_parse_radv_search_domains(
 771                 const char *unit,
 772                 const char *filename,
 773                 unsigned line,
 774                 const char *section,
 775                 unsigned section_line,
 776                 const char *lvalue,
 777                 int ltype,
 778                 const char *rvalue,
 779                 void *data,
 780                 void *userdata) {
 781
 782         Network *n = data;
 783         int r;
 784
 785         assert(filename);
 786         assert(lvalue);
 787         assert(rvalue);
 788
 789         for (const char *p = rvalue;;) {
 790                 _cleanup_free_ char *w = NULL, *idna = NULL;
 791
 792                 r = extract_first_word(&p, &w, NULL, 0);
 793                 if (r == -ENOMEM)
 794                         return log_oom();
 795                 if (r < 0) {
 796                         log_syntax(unit, LOG_WARNING, filename, line, r,
 797                                    "Failed to extract word, ignoring: %s", rvalue);
 798                         return 0;
 799                 }
 800                 if (r == 0)
 801                         return 0;
 802
 803                 r = dns_name_apply_idna(w, &idna);
 804                 if (r < 0) {
 805                         log_syntax(unit, LOG_WARNING, filename, line, r,
 806                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
 807                         continue;
 808                 } else if (r == 0)
 809                         /* transfer ownership to simplify subsequent operations */
 810                         idna = TAKE_PTR(w);
 811
 812                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops);
 813                 if (r < 0)
 814                         return log_oom();
 815
 816                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
 817                 if (r < 0)
 818                         return log_oom();
 819         }
 820 }
 821
 822 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
 823         [RADV_PREFIX_DELEGATION_NONE] = "no",
 824         [RADV_PREFIX_DELEGATION_STATIC] = "static",
 825         [RADV_PREFIX_DELEGATION_DHCP6] = "dhcpv6",
 826         [RADV_PREFIX_DELEGATION_BOTH] = "yes",
 827 };
 828
 829 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
 830                 radv_prefix_delegation,
 831                 RADVPrefixDelegation,
 832                 RADV_PREFIX_DELEGATION_BOTH);
 833
 834 DEFINE_CONFIG_PARSE_ENUM(config_parse_router_prefix_delegation,
 835                          radv_prefix_delegation,
 836                          RADVPrefixDelegation,
 837                          "Invalid router prefix delegation");
 838
 839 int config_parse_router_preference(const char *unit,
 840                                    const char *filename,
 841                                    unsigned line,
 842                                    const char *section,
 843                                    unsigned section_line,
 844                                    const char *lvalue,
 845                                    int ltype,
 846                                    const char *rvalue,
 847                                    void *data,
 848                                    void *userdata) {
 849         Network *network = userdata;
 850
 851         assert(filename);
 852         assert(section);
 853         assert(lvalue);
 854         assert(rvalue);
 855         assert(data);
 856
 857         if (streq(rvalue, "high"))
 858                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
 859         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
 860                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
 861         else if (streq(rvalue, "low"))
 862                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
 863         else
 864                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 865                            "Invalid router preference, ignoring assignment: %s", rvalue);
 866
 867         return 0;
 868 }