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         if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
 223                 return -EADDRNOTAVAIL;
 224
 225         log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);
 226
 227         p = NULL;
 228
 229         return 0;
 230 }
 231
 232 int config_parse_prefix_flags(const char *unit,
 233                               const char *filename,
 234                               unsigned line,
 235                               const char *section,
 236                               unsigned section_line,
 237                               const char *lvalue,
 238                               int ltype,
 239                               const char *rvalue,
 240                               void *data,
 241                               void *userdata) {
 242         Network *network = userdata;
 243         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 244         int r, val;
 245
 246         assert(filename);
 247         assert(section);
 248         assert(lvalue);
 249         assert(rvalue);
 250         assert(data);
 251
 252         r = prefix_new_static(network, filename, section_line, &p);
 253         if (r < 0)
 254                 return log_oom();
 255
 256         r = parse_boolean(rvalue);
 257         if (r < 0) {
 258                 log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 259                 return 0;
 260         }
 261
 262         val = r;
 263
 264         if (streq(lvalue, "OnLink"))
 265                 r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
 266         else if (streq(lvalue, "AddressAutoconfiguration"))
 267                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
 268         if (r < 0)
 269                 return r;
 270
 271         p = NULL;
 272
 273         return 0;
 274 }
 275
 276 int config_parse_prefix_lifetime(const char *unit,
 277                                  const char *filename,
 278                                  unsigned line,
 279                                  const char *section,
 280                                  unsigned section_line,
 281                                  const char *lvalue,
 282                                  int ltype,
 283                                  const char *rvalue,
 284                                  void *data,
 285                                  void *userdata) {
 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                 return r;
 316
 317         p = NULL;
 318
 319         return 0;
 320 }
 321
 322 int config_parse_prefix_assign(
 323                 const char *unit,
 324                 const char *filename,
 325                 unsigned line,
 326                 const char *section,
 327                 unsigned section_line,
 328                 const char *lvalue,
 329                 int ltype,
 330                 const char *rvalue,
 331                 void *data,
 332                 void *userdata) {
 333
 334         Network *network = userdata;
 335         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 336         int r;
 337
 338         assert(filename);
 339         assert(section);
 340         assert(lvalue);
 341         assert(rvalue);
 342         assert(data);
 343
 344         r = prefix_new_static(network, filename, section_line, &p);
 345         if (r < 0)
 346                 return log_oom();
 347
 348         r = parse_boolean(rvalue);
 349         if (r < 0) {
 350                 log_syntax(unit, LOG_WARNING, filename, line, r,
 351                            "Failed to parse %s=, ignoring assignment: %s",
 352                            lvalue, rvalue);
 353                 return 0;
 354         }
 355
 356         p->assign = r;
 357         p = NULL;
 358
 359         return 0;
 360 }
 361
 362 int config_parse_route_prefix(const char *unit,
 363                               const char *filename,
 364                               unsigned line,
 365                               const char *section,
 366                               unsigned section_line,
 367                               const char *lvalue,
 368                               int ltype,
 369                               const char *rvalue,
 370                               void *data,
 371                               void *userdata) {
 372
 373         Network *network = userdata;
 374         _cleanup_(route_prefix_free_or_set_invalidp) RoutePrefix *p = NULL;
 375         uint8_t prefixlen = 64;
 376         union in_addr_union in6addr;
 377         int r;
 378
 379         assert(filename);
 380         assert(section);
 381         assert(lvalue);
 382         assert(rvalue);
 383         assert(data);
 384
 385         r = route_prefix_new_static(network, filename, section_line, &p);
 386         if (r < 0)
 387                 return log_oom();
 388
 389         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 390         if (r < 0) {
 391                 log_syntax(unit, LOG_WARNING, filename, line, r, "Route prefix is invalid, ignoring assignment: %s", rvalue);
 392                 return 0;
 393         }
 394
 395         if (sd_radv_prefix_set_route_prefix(p->radv_route_prefix, &in6addr.in6, prefixlen) < 0)
 396                 return -EADDRNOTAVAIL;
 397
 398         log_syntax(unit, LOG_INFO, filename, line, r, "Found route prefix %s", rvalue);
 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                 return r;
 441
 442         p = NULL;
 443
 444         return 0;
 445 }
 446
 447 static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
 448                            size_t *n_dns) {
 449         _cleanup_free_ struct in6_addr *addresses = NULL;
 450         size_t i, n_addresses = 0, n_allocated = 0;
 451
 452         assert(network);
 453         assert(dns);
 454         assert(n_dns);
 455
 456         for (i = 0; i < network->n_dns; i++) {
 457                 union in_addr_union *addr;
 458
 459                 if (network->dns[i].family != AF_INET6)
 460                         continue;
 461
 462                 addr = &network->dns[i].address;
 463
 464                 if (in_addr_is_null(AF_INET6, addr) ||
 465                     in_addr_is_link_local(AF_INET6, addr) ||
 466                     in_addr_is_localhost(AF_INET6, addr))
 467                         continue;
 468
 469                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 470                         return -ENOMEM;
 471
 472                 addresses[n_addresses++] = addr->in6;
 473         }
 474
 475         if (addresses) {
 476                 *dns = TAKE_PTR(addresses);
 477
 478                 *n_dns = n_addresses;
 479         }
 480
 481         return n_addresses;
 482 }
 483
 484 static int radv_set_dns(Link *link, Link *uplink) {
 485         _cleanup_free_ struct in6_addr *dns = NULL;
 486         usec_t lifetime_usec;
 487         size_t n_dns;
 488         int r;
 489
 490         if (!link->network->router_emit_dns)
 491                 return 0;
 492
 493         if (link->network->router_dns) {
 494                 struct in6_addr *p;
 495
 496                 dns = new(struct in6_addr, link->network->n_router_dns);
 497                 if (!dns)
 498                         return -ENOMEM;
 499
 500                 p = dns;
 501                 for (size_t i = 0; i < link->network->n_router_dns; i++)
 502                         if (IN6_IS_ADDR_UNSPECIFIED(&link->network->router_dns[i])) {
 503                                 if (!IN6_IS_ADDR_UNSPECIFIED(&link->ipv6ll_address))
 504                                         *(p++) = link->ipv6ll_address;
 505                         } else
 506                                 *(p++) = link->network->router_dns[i];
 507
 508                 n_dns = p - dns;
 509                 lifetime_usec = link->network->router_dns_lifetime_usec;
 510
 511                 goto set_dns;
 512         }
 513
 514         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 515
 516         r = radv_get_ip6dns(link->network, &dns, &n_dns);
 517         if (r > 0)
 518                 goto set_dns;
 519
 520         if (uplink) {
 521                 if (!uplink->network) {
 522                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 523                         return 0;
 524                 }
 525
 526                 r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
 527                 if (r > 0)
 528                         goto set_dns;
 529         }
 530
 531         return 0;
 532
 533  set_dns:
 534         return sd_radv_set_rdnss(link->radv,
 535                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 536                                  dns, n_dns);
 537 }
 538
 539 static int radv_set_domains(Link *link, Link *uplink) {
 540         OrderedSet *search_domains;
 541         usec_t lifetime_usec;
 542         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 543
 544         if (!link->network->router_emit_domains)
 545                 return 0;
 546
 547         search_domains = link->network->router_search_domains;
 548         lifetime_usec = link->network->router_dns_lifetime_usec;
 549
 550         if (search_domains)
 551                 goto set_domains;
 552
 553         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 554
 555         search_domains = link->network->search_domains;
 556         if (search_domains)
 557                 goto set_domains;
 558
 559         if (uplink) {
 560                 if (!uplink->network) {
 561                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 562                         return 0;
 563                 }
 564
 565                 search_domains = uplink->network->search_domains;
 566                 if (search_domains)
 567                         goto set_domains;
 568         }
 569
 570         return 0;
 571
 572  set_domains:
 573         s = ordered_set_get_strv(search_domains);
 574         if (!s)
 575                 return log_oom();
 576
 577         return sd_radv_set_dnssl(link->radv,
 578                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 579                                  s);
 580
 581 }
 582
 583 int radv_emit_dns(Link *link) {
 584         Link *uplink;
 585         int r;
 586
 587         uplink = manager_find_uplink(link->manager, link);
 588
 589         r = radv_set_dns(link, uplink);
 590         if (r < 0)
 591                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 592
 593         r = radv_set_domains(link, uplink);
 594         if (r < 0)
 595                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 596
 597         return 0;
 598 }
 599
 600 int radv_configure(Link *link) {
 601         RoutePrefix *q;
 602         Prefix *p;
 603         int r;
 604
 605         assert(link);
 606         assert(link->network);
 607
 608         r = sd_radv_new(&link->radv);
 609         if (r < 0)
 610                 return r;
 611
 612         r = sd_radv_attach_event(link->radv, NULL, 0);
 613         if (r < 0)
 614                 return r;
 615
 616         r = sd_radv_set_mac(link->radv, &link->mac);
 617         if (r < 0)
 618                 return r;
 619
 620         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 621         if (r < 0)
 622                 return r;
 623
 624         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 625         if (r < 0)
 626                 return r;
 627
 628         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 629         if (r < 0)
 630                 return r;
 631
 632         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 633            not a router */
 634         r = sd_radv_set_router_lifetime(link->radv,
 635                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 636         if (r < 0)
 637                 return r;
 638
 639         if (link->network->router_lifetime_usec > 0) {
 640                 r = sd_radv_set_preference(link->radv,
 641                                            link->network->router_preference);
 642                 if (r < 0)
 643                         return r;
 644         }
 645
 646         if (IN_SET(link->network->router_prefix_delegation,
 647                    RADV_PREFIX_DELEGATION_STATIC,
 648                    RADV_PREFIX_DELEGATION_BOTH)) {
 649
 650                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
 651                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 652                         if (r == -EEXIST)
 653                                 continue;
 654                         if (r == -ENOEXEC) {
 655                                 log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section.");
 656                                 continue;
 657                         }
 658                         if (r < 0)
 659                                 return r;
 660                 }
 661
 662                 LIST_FOREACH(route_prefixes, q, link->network->static_route_prefixes) {
 663                         r = sd_radv_add_route_prefix(link->radv, q->radv_route_prefix, false);
 664                         if (r == -EEXIST)
 665                                 continue;
 666                         if (r < 0)
 667                                 return r;
 668                 }
 669
 670         }
 671
 672         return 0;
 673 }
 674
 675 int radv_add_prefix(Link *link, 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         assert(link->radv);
 682
 683         r = sd_radv_prefix_new(&p);
 684         if (r < 0)
 685                 return r;
 686
 687         r = sd_radv_prefix_set_prefix(p, prefix, prefix_len);
 688         if (r < 0)
 689                 return r;
 690
 691         r = sd_radv_prefix_set_preferred_lifetime(p, lifetime_preferred);
 692         if (r < 0)
 693                 return r;
 694
 695         r = sd_radv_prefix_set_valid_lifetime(p, lifetime_valid);
 696         if (r < 0)
 697                 return r;
 698
 699         r = sd_radv_add_prefix(link->radv, p, true);
 700         if (r < 0 && r != -EEXIST)
 701                 return r;
 702
 703         return 0;
 704 }
 705
 706 int config_parse_radv_dns(
 707                 const char *unit,
 708                 const char *filename,
 709                 unsigned line,
 710                 const char *section,
 711                 unsigned section_line,
 712                 const char *lvalue,
 713                 int ltype,
 714                 const char *rvalue,
 715                 void *data,
 716                 void *userdata) {
 717
 718         Network *n = data;
 719         int r;
 720
 721         assert(filename);
 722         assert(lvalue);
 723         assert(rvalue);
 724
 725         for (const char *p = rvalue;;) {
 726                 _cleanup_free_ char *w = NULL;
 727                 union in_addr_union a;
 728
 729                 r = extract_first_word(&p, &w, NULL, 0);
 730                 if (r == -ENOMEM)
 731                         return log_oom();
 732                 if (r < 0) {
 733                         log_syntax(unit, LOG_WARNING, filename, line, r,
 734                                    "Failed to extract word, ignoring: %s", rvalue);
 735                         return 0;
 736                 }
 737                 if (r == 0)
 738                         return 0;
 739
 740                 if (streq(w, "_link_local"))
 741                         a = IN_ADDR_NULL;
 742                 else {
 743                         r = in_addr_from_string(AF_INET6, w, &a);
 744                         if (r < 0) {
 745                                 log_syntax(unit, LOG_WARNING, filename, line, r,
 746                                            "Failed to parse DNS server address, ignoring: %s", w);
 747                                 continue;
 748                         }
 749
 750                         if (in_addr_is_null(AF_INET6, &a)) {
 751                                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 752                                            "DNS server address is null, ignoring: %s", w);
 753                                 continue;
 754                         }
 755                 }
 756
 757                 struct in6_addr *m;
 758                 m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
 759                 if (!m)
 760                         return log_oom();
 761
 762                 m[n->n_router_dns++] = a.in6;
 763                 n->router_dns = m;
 764         }
 765 }
 766
 767 int config_parse_radv_search_domains(
 768                 const char *unit,
 769                 const char *filename,
 770                 unsigned line,
 771                 const char *section,
 772                 unsigned section_line,
 773                 const char *lvalue,
 774                 int ltype,
 775                 const char *rvalue,
 776                 void *data,
 777                 void *userdata) {
 778
 779         Network *n = data;
 780         int r;
 781
 782         assert(filename);
 783         assert(lvalue);
 784         assert(rvalue);
 785
 786         for (const char *p = rvalue;;) {
 787                 _cleanup_free_ char *w = NULL, *idna = NULL;
 788
 789                 r = extract_first_word(&p, &w, NULL, 0);
 790                 if (r == -ENOMEM)
 791                         return log_oom();
 792                 if (r < 0) {
 793                         log_syntax(unit, LOG_WARNING, filename, line, r,
 794                                    "Failed to extract word, ignoring: %s", rvalue);
 795                         return 0;
 796                 }
 797                 if (r == 0)
 798                         return 0;
 799
 800                 r = dns_name_apply_idna(w, &idna);
 801                 if (r < 0) {
 802                         log_syntax(unit, LOG_WARNING, filename, line, r,
 803                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
 804                         continue;
 805                 } else if (r == 0)
 806                         /* transfer ownership to simplify subsequent operations */
 807                         idna = TAKE_PTR(w);
 808
 809                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops);
 810                 if (r < 0)
 811                         return log_oom();
 812
 813                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
 814                 if (r < 0)
 815                         return log_oom();
 816         }
 817 }
 818
 819 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
 820         [RADV_PREFIX_DELEGATION_NONE] = "no",
 821         [RADV_PREFIX_DELEGATION_STATIC] = "static",
 822         [RADV_PREFIX_DELEGATION_DHCP6] = "dhcpv6",
 823         [RADV_PREFIX_DELEGATION_BOTH] = "yes",
 824 };
 825
 826 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
 827                 radv_prefix_delegation,
 828                 RADVPrefixDelegation,
 829                 RADV_PREFIX_DELEGATION_BOTH);
 830
 831 int config_parse_router_prefix_delegation(
 832                 const char *unit,
 833                 const char *filename,
 834                 unsigned line,
 835                 const char *section,
 836                 unsigned section_line,
 837                 const char *lvalue,
 838                 int ltype,
 839                 const char *rvalue,
 840                 void *data,
 841                 void *userdata) {
 842
 843         Network *network = userdata;
 844         RADVPrefixDelegation d;
 845
 846         assert(filename);
 847         assert(section);
 848         assert(lvalue);
 849         assert(rvalue);
 850         assert(data);
 851
 852         d = radv_prefix_delegation_from_string(rvalue);
 853         if (d < 0) {
 854                 log_syntax(unit, LOG_WARNING, filename, line, SYNTHETIC_ERRNO(EINVAL),
 855                            "Invalid router prefix delegation '%s', ignoring assignment.", rvalue);
 856                 return 0;
 857         }
 858
 859         network->router_prefix_delegation = d;
 860
 861         return 0;
 862 }
 863
 864 int config_parse_router_preference(const char *unit,
 865                                    const char *filename,
 866                                    unsigned line,
 867                                    const char *section,
 868                                    unsigned section_line,
 869                                    const char *lvalue,
 870                                    int ltype,
 871                                    const char *rvalue,
 872                                    void *data,
 873                                    void *userdata) {
 874         Network *network = userdata;
 875
 876         assert(filename);
 877         assert(section);
 878         assert(lvalue);
 879         assert(rvalue);
 880         assert(data);
 881
 882         if (streq(rvalue, "high"))
 883                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
 884         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
 885                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
 886         else if (streq(rvalue, "low"))
 887                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
 888         else
 889                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 890                            "Invalid router preference, ignoring assignment: %s", rvalue);
 891
 892         return 0;
 893 }
 894
 895 int config_parse_router_prefix_subnet_id(const char *unit,
 896                 const char *filename,
 897                 unsigned line,
 898                 const char *section,
 899                 unsigned section_line,
 900                 const char *lvalue,
 901                 int ltype,
 902                 const char *rvalue,
 903                 void *data,
 904                 void *userdata) {
 905         Network *network = userdata;
 906         uint64_t t;
 907         int r;
 908
 909         assert(filename);
 910         assert(lvalue);
 911         assert(rvalue);
 912         assert(data);
 913
 914         if (isempty(rvalue) || streq(rvalue, "auto")) {
 915                 network->router_prefix_subnet_id = -1;
 916                 return 0;
 917         }
 918
 919         r = safe_atoux64(rvalue, &t);
 920         if (r < 0 || t > INT64_MAX) {
 921                 log_syntax(unit, LOG_WARNING, filename, line, r,
 922                                 "Subnet id '%s' is invalid, ignoring assignment.",
 923                                 rvalue);
 924                 return 0;
 925         }
 926
 927         network->router_prefix_subnet_id = (int64_t)t;
 928
 929         return 0;
 930 }