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         prefix->radv_prefix = sd_radv_prefix_unref(prefix->radv_prefix);
  35
  36         free(prefix);
  37 }
  38
  39 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 int config_parse_prefix(const char *unit,
 105                 const char *filename,
 106                 unsigned line,
 107                 const char *section,
 108                 unsigned section_line,
 109                 const char *lvalue,
 110                 int ltype,
 111                 const char *rvalue,
 112                 void *data,
 113                 void *userdata) {
 114
 115         Network *network = userdata;
 116         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 117         uint8_t prefixlen = 64;
 118         union in_addr_union in6addr;
 119         int r;
 120
 121         assert(filename);
 122         assert(section);
 123         assert(lvalue);
 124         assert(rvalue);
 125         assert(data);
 126
 127         r = prefix_new_static(network, filename, section_line, &p);
 128         if (r < 0)
 129                 return r;
 130
 131         r = in_addr_prefix_from_string(rvalue, AF_INET6, &in6addr, &prefixlen);
 132         if (r < 0) {
 133                 log_syntax(unit, LOG_ERR, filename, line, r, "Prefix is invalid, ignoring assignment: %s", rvalue);
 134                 return 0;
 135         }
 136
 137         if (sd_radv_prefix_set_prefix(p->radv_prefix, &in6addr.in6, prefixlen) < 0)
 138                 return -EADDRNOTAVAIL;
 139
 140         log_syntax(unit, LOG_INFO, filename, line, r, "Found prefix %s", rvalue);
 141
 142         p = NULL;
 143
 144         return 0;
 145 }
 146
 147 int config_parse_prefix_flags(const char *unit,
 148                               const char *filename,
 149                               unsigned line,
 150                               const char *section,
 151                               unsigned section_line,
 152                               const char *lvalue,
 153                               int ltype,
 154                               const char *rvalue,
 155                               void *data,
 156                               void *userdata) {
 157         Network *network = userdata;
 158         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 159         int r, val;
 160
 161         assert(filename);
 162         assert(section);
 163         assert(lvalue);
 164         assert(rvalue);
 165         assert(data);
 166
 167         r = prefix_new_static(network, filename, section_line, &p);
 168         if (r < 0)
 169                 return r;
 170
 171         r = parse_boolean(rvalue);
 172         if (r < 0) {
 173                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 174                 return 0;
 175         }
 176
 177         val = r;
 178
 179         if (streq(lvalue, "OnLink"))
 180                 r = sd_radv_prefix_set_onlink(p->radv_prefix, val);
 181         else if (streq(lvalue, "AddressAutoconfiguration"))
 182                 r = sd_radv_prefix_set_address_autoconfiguration(p->radv_prefix, val);
 183         if (r < 0)
 184                 return r;
 185
 186         p = NULL;
 187
 188         return 0;
 189 }
 190
 191 int config_parse_prefix_lifetime(const char *unit,
 192                                  const char *filename,
 193                                  unsigned line,
 194                                  const char *section,
 195                                  unsigned section_line,
 196                                  const char *lvalue,
 197                                  int ltype,
 198                                  const char *rvalue,
 199                                  void *data,
 200                                  void *userdata) {
 201         Network *network = userdata;
 202         _cleanup_(prefix_free_or_set_invalidp) Prefix *p = NULL;
 203         usec_t usec;
 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 r;
 215
 216         r = parse_sec(rvalue, &usec);
 217         if (r < 0) {
 218                 log_syntax(unit, LOG_ERR, filename, line, r, "Lifetime is invalid, ignoring assignment: %s", rvalue);
 219                 return 0;
 220         }
 221
 222         /* a value of 0xffffffff represents infinity */
 223         if (streq(lvalue, "PreferredLifetimeSec"))
 224                 r = sd_radv_prefix_set_preferred_lifetime(p->radv_prefix,
 225                                                           DIV_ROUND_UP(usec, USEC_PER_SEC));
 226         else if (streq(lvalue, "ValidLifetimeSec"))
 227                 r = sd_radv_prefix_set_valid_lifetime(p->radv_prefix,
 228                                                       DIV_ROUND_UP(usec, USEC_PER_SEC));
 229         if (r < 0)
 230                 return r;
 231
 232         p = NULL;
 233
 234         return 0;
 235 }
 236
 237 static int radv_get_ip6dns(Network *network, struct in6_addr **dns,
 238                            size_t *n_dns) {
 239         _cleanup_free_ struct in6_addr *addresses = NULL;
 240         size_t i, n_addresses = 0, n_allocated = 0;
 241
 242         assert(network);
 243         assert(dns);
 244         assert(n_dns);
 245
 246         for (i = 0; i < network->n_dns; i++) {
 247                 union in_addr_union *addr;
 248
 249                 if (network->dns[i].family != AF_INET6)
 250                         continue;
 251
 252                 addr = &network->dns[i].address;
 253
 254                 if (in_addr_is_null(AF_INET6, addr) ||
 255                     in_addr_is_link_local(AF_INET6, addr) ||
 256                     in_addr_is_localhost(AF_INET6, addr))
 257                         continue;
 258
 259                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
 260                         return -ENOMEM;
 261
 262                 addresses[n_addresses++] = addr->in6;
 263         }
 264
 265         if (addresses) {
 266                 *dns = TAKE_PTR(addresses);
 267
 268                 *n_dns = n_addresses;
 269         }
 270
 271         return n_addresses;
 272 }
 273
 274 static int radv_set_dns(Link *link, Link *uplink) {
 275         _cleanup_free_ struct in6_addr *dns = NULL;
 276         size_t n_dns;
 277         usec_t lifetime_usec;
 278         int r;
 279
 280         if (!link->network->router_emit_dns)
 281                 return 0;
 282
 283         if (link->network->router_dns) {
 284                 dns = newdup(struct in6_addr, link->network->router_dns,
 285                              link->network->n_router_dns);
 286                 if (!dns)
 287                         return -ENOMEM;
 288
 289                 n_dns = link->network->n_router_dns;
 290                 lifetime_usec = link->network->router_dns_lifetime_usec;
 291
 292                 goto set_dns;
 293         }
 294
 295         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 296
 297         r = radv_get_ip6dns(link->network, &dns, &n_dns);
 298         if (r > 0)
 299                 goto set_dns;
 300
 301         if (uplink) {
 302                 if (!uplink->network) {
 303                         log_link_debug(uplink, "Cannot fetch DNS servers as uplink interface is not managed by us");
 304                         return 0;
 305                 }
 306
 307                 r = radv_get_ip6dns(uplink->network, &dns, &n_dns);
 308                 if (r > 0)
 309                         goto set_dns;
 310         }
 311
 312         return 0;
 313
 314  set_dns:
 315         return sd_radv_set_rdnss(link->radv,
 316                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 317                                  dns, n_dns);
 318 }
 319
 320 static int radv_set_domains(Link *link, Link *uplink) {
 321         OrderedSet *search_domains;
 322         usec_t lifetime_usec;
 323         _cleanup_free_ char **s = NULL; /* just free() because the strings are owned by the set */
 324
 325         if (!link->network->router_emit_domains)
 326                 return 0;
 327
 328         search_domains = link->network->router_search_domains;
 329         lifetime_usec = link->network->router_dns_lifetime_usec;
 330
 331         if (search_domains)
 332                 goto set_domains;
 333
 334         lifetime_usec = SD_RADV_DEFAULT_DNS_LIFETIME_USEC;
 335
 336         search_domains = link->network->search_domains;
 337         if (search_domains)
 338                 goto set_domains;
 339
 340         if (uplink) {
 341                 if (!uplink->network) {
 342                         log_link_debug(uplink, "Cannot fetch DNS search domains as uplink interface is not managed by us");
 343                         return 0;
 344                 }
 345
 346                 search_domains = uplink->network->search_domains;
 347                 if (search_domains)
 348                         goto set_domains;
 349         }
 350
 351         return 0;
 352
 353  set_domains:
 354         s = ordered_set_get_strv(search_domains);
 355         if (!s)
 356                 return log_oom();
 357
 358         return sd_radv_set_dnssl(link->radv,
 359                                  DIV_ROUND_UP(lifetime_usec, USEC_PER_SEC),
 360                                  s);
 361
 362 }
 363
 364 int radv_emit_dns(Link *link) {
 365         Link *uplink;
 366         int r;
 367
 368         uplink = manager_find_uplink(link->manager, link);
 369
 370         r = radv_set_dns(link, uplink);
 371         if (r < 0)
 372                 log_link_warning_errno(link, r, "Could not set RA DNS: %m");
 373
 374         r = radv_set_domains(link, uplink);
 375         if (r < 0)
 376                 log_link_warning_errno(link, r, "Could not set RA Domains: %m");
 377
 378         return 0;
 379 }
 380
 381 int radv_configure(Link *link) {
 382         int r;
 383         Prefix *p;
 384
 385         assert(link);
 386         assert(link->network);
 387
 388         r = sd_radv_new(&link->radv);
 389         if (r < 0)
 390                 return r;
 391
 392         r = sd_radv_attach_event(link->radv, NULL, 0);
 393         if (r < 0)
 394                 return r;
 395
 396         r = sd_radv_set_mac(link->radv, &link->mac);
 397         if (r < 0)
 398                 return r;
 399
 400         r = sd_radv_set_ifindex(link->radv, link->ifindex);
 401         if (r < 0)
 402                 return r;
 403
 404         r = sd_radv_set_managed_information(link->radv, link->network->router_managed);
 405         if (r < 0)
 406                 return r;
 407
 408         r = sd_radv_set_other_information(link->radv, link->network->router_other_information);
 409         if (r < 0)
 410                 return r;
 411
 412         /* a value of 0xffffffff represents infinity, 0x0 means this host is
 413            not a router */
 414         r = sd_radv_set_router_lifetime(link->radv,
 415                                         DIV_ROUND_UP(link->network->router_lifetime_usec, USEC_PER_SEC));
 416         if (r < 0)
 417                 return r;
 418
 419         if (link->network->router_lifetime_usec > 0) {
 420                 r = sd_radv_set_preference(link->radv,
 421                                            link->network->router_preference);
 422                 if (r < 0)
 423                         return r;
 424         }
 425
 426         if (IN_SET(link->network->router_prefix_delegation,
 427                    RADV_PREFIX_DELEGATION_STATIC,
 428                    RADV_PREFIX_DELEGATION_BOTH)) {
 429
 430                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
 431                         r = sd_radv_add_prefix(link->radv, p->radv_prefix, false);
 432                         if (r == -EEXIST)
 433                                 continue;
 434                         if (r == -ENOEXEC) {
 435                                 log_link_warning_errno(link, r, "[IPv6Prefix] section configured without Prefix= setting, ignoring section.");
 436                                 continue;
 437                         }
 438                         if (r < 0)
 439                                 return r;
 440                 }
 441         }
 442
 443         return radv_emit_dns(link);
 444 }
 445
 446 int config_parse_radv_dns(
 447                 const char *unit,
 448                 const char *filename,
 449                 unsigned line,
 450                 const char *section,
 451                 unsigned section_line,
 452                 const char *lvalue,
 453                 int ltype,
 454                 const char *rvalue,
 455                 void *data,
 456                 void *userdata) {
 457
 458         Network *n = data;
 459         const char *p = rvalue;
 460         int r;
 461
 462         assert(filename);
 463         assert(lvalue);
 464         assert(rvalue);
 465
 466         for (;;) {
 467                 _cleanup_free_ char *w = NULL;
 468                 union in_addr_union a;
 469
 470                 r = extract_first_word(&p, &w, NULL, 0);
 471                 if (r == -ENOMEM)
 472                         return log_oom();
 473                 if (r < 0) {
 474                         log_syntax(unit, LOG_ERR, filename, line, r,
 475                                    "Failed to extract word, ignoring: %s", rvalue);
 476                         return 0;
 477                 }
 478                 if (r == 0)
 479                         break;
 480
 481                 if (in_addr_from_string(AF_INET6, w, &a) >= 0) {
 482                         struct in6_addr *m;
 483
 484                         m = reallocarray(n->router_dns, n->n_router_dns + 1, sizeof(struct in6_addr));
 485                         if (!m)
 486                                 return log_oom();
 487
 488                         m[n->n_router_dns++] = a.in6;
 489                         n->router_dns = m;
 490
 491                 } else
 492                         log_syntax(unit, LOG_ERR, filename, line, 0,
 493                                    "Failed to parse DNS server address, ignoring: %s", w);
 494         }
 495
 496         return 0;
 497 }
 498
 499 int config_parse_radv_search_domains(
 500                 const char *unit,
 501                 const char *filename,
 502                 unsigned line,
 503                 const char *section,
 504                 unsigned section_line,
 505                 const char *lvalue,
 506                 int ltype,
 507                 const char *rvalue,
 508                 void *data,
 509                 void *userdata) {
 510
 511         Network *n = data;
 512         const char *p = rvalue;
 513         int r;
 514
 515         assert(filename);
 516         assert(lvalue);
 517         assert(rvalue);
 518
 519         for (;;) {
 520                 _cleanup_free_ char *w = NULL, *idna = NULL;
 521
 522                 r = extract_first_word(&p, &w, NULL, 0);
 523                 if (r == -ENOMEM)
 524                         return log_oom();
 525                 if (r < 0) {
 526                         log_syntax(unit, LOG_ERR, filename, line, r,
 527                                    "Failed to extract word, ignoring: %s", rvalue);
 528                         return 0;
 529                 }
 530                 if (r == 0)
 531                         break;
 532
 533                 r = dns_name_apply_idna(w, &idna);
 534                 if (r < 0) {
 535                         log_syntax(unit, LOG_ERR, filename, line, r,
 536                                    "Failed to apply IDNA to domain name '%s', ignoring: %m", w);
 537                         continue;
 538                 } else if (r == 0)
 539                         /* transfer ownership to simplify subsequent operations */
 540                         idna = TAKE_PTR(w);
 541
 542                 r = ordered_set_ensure_allocated(&n->router_search_domains, &string_hash_ops);
 543                 if (r < 0)
 544                         return r;
 545
 546                 r = ordered_set_consume(n->router_search_domains, TAKE_PTR(idna));
 547                 if (r < 0)
 548                         return r;
 549         }
 550
 551         return 0;
 552 }
 553
 554 static const char * const radv_prefix_delegation_table[_RADV_PREFIX_DELEGATION_MAX] = {
 555         [RADV_PREFIX_DELEGATION_NONE] = "no",
 556         [RADV_PREFIX_DELEGATION_STATIC] = "static",
 557         [RADV_PREFIX_DELEGATION_DHCP6] = "dhcpv6",
 558         [RADV_PREFIX_DELEGATION_BOTH] = "yes",
 559 };
 560
 561 DEFINE_STRING_TABLE_LOOKUP_WITH_BOOLEAN(
 562                 radv_prefix_delegation,
 563                 RADVPrefixDelegation,
 564                 RADV_PREFIX_DELEGATION_BOTH);
 565
 566 int config_parse_router_prefix_delegation(
 567                 const char *unit,
 568                 const char *filename,
 569                 unsigned line,
 570                 const char *section,
 571                 unsigned section_line,
 572                 const char *lvalue,
 573                 int ltype,
 574                 const char *rvalue,
 575                 void *data,
 576                 void *userdata) {
 577
 578         Network *network = userdata;
 579         RADVPrefixDelegation d;
 580
 581         assert(filename);
 582         assert(section);
 583         assert(lvalue);
 584         assert(rvalue);
 585         assert(data);
 586
 587         d = radv_prefix_delegation_from_string(rvalue);
 588         if (d < 0) {
 589                 log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Invalid router prefix delegation '%s', ignoring assignment.", rvalue);
 590                 return 0;
 591         }
 592
 593         network->router_prefix_delegation = d;
 594
 595         return 0;
 596 }
 597
 598 int config_parse_router_preference(const char *unit,
 599                                    const char *filename,
 600                                    unsigned line,
 601                                    const char *section,
 602                                    unsigned section_line,
 603                                    const char *lvalue,
 604                                    int ltype,
 605                                    const char *rvalue,
 606                                    void *data,
 607                                    void *userdata) {
 608         Network *network = userdata;
 609
 610         assert(filename);
 611         assert(section);
 612         assert(lvalue);
 613         assert(rvalue);
 614         assert(data);
 615
 616         if (streq(rvalue, "high"))
 617                 network->router_preference = SD_NDISC_PREFERENCE_HIGH;
 618         else if (STR_IN_SET(rvalue, "medium", "normal", "default"))
 619                 network->router_preference = SD_NDISC_PREFERENCE_MEDIUM;
 620         else if (streq(rvalue, "low"))
 621                 network->router_preference = SD_NDISC_PREFERENCE_LOW;
 622         else
 623                 log_syntax(unit, LOG_ERR, filename, line, -EINVAL, "Router preference '%s' is invalid, ignoring assignment: %m", rvalue);
 624
 625         return 0;
 626 }