src/network/networkd-address.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <net/if.h>
   4
   5 #include "alloc-util.h"
   6 #include "conf-parser.h"
   7 #include "firewall-util.h"
   8 #include "memory-util.h"
   9 #include "missing_network.h"
  10 #include "netlink-util.h"
  11 #include "networkd-address.h"
  12 #include "networkd-manager.h"
  13 #include "parse-util.h"
  14 #include "set.h"
  15 #include "socket-util.h"
  16 #include "string-util.h"
  17 #include "strv.h"
  18 #include "utf8.h"
  19
  20 #define ADDRESSES_PER_LINK_MAX 2048U
  21 #define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
  22
  23 int address_new(Address **ret) {
  24         _cleanup_(address_freep) Address *address = NULL;
  25
  26         address = new(Address, 1);
  27         if (!address)
  28                 return -ENOMEM;
  29
  30         *address = (Address) {
  31                 .family = AF_UNSPEC,
  32                 .scope = RT_SCOPE_UNIVERSE,
  33                 .cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME,
  34                 .cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME,
  35         };
  36
  37         *ret = TAKE_PTR(address);
  38
  39         return 0;
  40 }
  41
  42 static int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) {
  43         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  44         _cleanup_(address_freep) Address *address = NULL;
  45         int r;
  46
  47         assert(network);
  48         assert(ret);
  49         assert(!!filename == (section_line > 0));
  50
  51         if (filename) {
  52                 r = network_config_section_new(filename, section_line, &n);
  53                 if (r < 0)
  54                         return r;
  55
  56                 address = hashmap_get(network->addresses_by_section, n);
  57                 if (address) {
  58                         *ret = TAKE_PTR(address);
  59
  60                         return 0;
  61                 }
  62         }
  63
  64         if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX)
  65                 return -E2BIG;
  66
  67         r = address_new(&address);
  68         if (r < 0)
  69                 return r;
  70
  71         address->network = network;
  72         LIST_APPEND(addresses, network->static_addresses, address);
  73         network->n_static_addresses++;
  74
  75         if (filename) {
  76                 address->section = TAKE_PTR(n);
  77
  78                 r = hashmap_ensure_allocated(&network->addresses_by_section, &network_config_hash_ops);
  79                 if (r < 0)
  80                         return r;
  81
  82                 r = hashmap_put(network->addresses_by_section, address->section, address);
  83                 if (r < 0)
  84                         return r;
  85         }
  86
  87         *ret = TAKE_PTR(address);
  88
  89         return 0;
  90 }
  91
  92 void address_free(Address *address) {
  93         if (!address)
  94                 return;
  95
  96         if (address->network) {
  97                 LIST_REMOVE(addresses, address->network->static_addresses, address);
  98                 assert(address->network->n_static_addresses > 0);
  99                 address->network->n_static_addresses--;
 100
 101                 if (address->section)
 102                         hashmap_remove(address->network->addresses_by_section, address->section);
 103         }
 104
 105         if (address->link) {
 106                 set_remove(address->link->addresses, address);
 107                 set_remove(address->link->addresses_foreign, address);
 108
 109                 if (in_addr_equal(AF_INET6, &address->in_addr, (const union in_addr_union *) &address->link->ipv6ll_address))
 110                         memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr));
 111         }
 112
 113         network_config_section_free(address->section);
 114         free(address->label);
 115         free(address);
 116 }
 117
 118 static void address_hash_func(const Address *a, struct siphash *state) {
 119         assert(a);
 120
 121         siphash24_compress(&a->family, sizeof(a->family), state);
 122
 123         switch (a->family) {
 124         case AF_INET:
 125                 siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
 126
 127                 /* peer prefix */
 128                 if (a->prefixlen != 0) {
 129                         uint32_t prefix;
 130
 131                         if (a->in_addr_peer.in.s_addr != 0)
 132                                 prefix = be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen);
 133                         else
 134                                 prefix = be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen);
 135
 136                         siphash24_compress(&prefix, sizeof(prefix), state);
 137                 }
 138
 139                 _fallthrough_;
 140         case AF_INET6:
 141                 /* local address */
 142                 siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
 143
 144                 break;
 145         default:
 146                 /* treat any other address family as AF_UNSPEC */
 147                 break;
 148         }
 149 }
 150
 151 static int address_compare_func(const Address *a1, const Address *a2) {
 152         int r;
 153
 154         r = CMP(a1->family, a2->family);
 155         if (r != 0)
 156                 return r;
 157
 158         switch (a1->family) {
 159         /* use the same notion of equality as the kernel does */
 160         case AF_INET:
 161                 r = CMP(a1->prefixlen, a2->prefixlen);
 162                 if (r != 0)
 163                         return r;
 164
 165                 /* compare the peer prefixes */
 166                 if (a1->prefixlen != 0) {
 167                         /* make sure we don't try to shift by 32.
 168                          * See ISO/IEC 9899:TC3 § 6.5.7.3. */
 169                         uint32_t b1, b2;
 170
 171                         if (a1->in_addr_peer.in.s_addr != 0)
 172                                 b1 = be32toh(a1->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 173                         else
 174                                 b1 = be32toh(a1->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 175
 176                         if (a2->in_addr_peer.in.s_addr != 0)
 177                                 b2 = be32toh(a2->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 178                         else
 179                                 b2 = be32toh(a2->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 180
 181                         r = CMP(b1, b2);
 182                         if (r != 0)
 183                                 return r;
 184                 }
 185
 186                 _fallthrough_;
 187         case AF_INET6:
 188                 return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
 189         default:
 190                 /* treat any other address family as AF_UNSPEC */
 191                 return 0;
 192         }
 193 }
 194
 195 DEFINE_PRIVATE_HASH_OPS(address_hash_ops, Address, address_hash_func, address_compare_func);
 196
 197 bool address_equal(Address *a1, Address *a2) {
 198         if (a1 == a2)
 199                 return true;
 200
 201         if (!a1 || !a2)
 202                 return false;
 203
 204         return address_compare_func(a1, a2) == 0;
 205 }
 206
 207 static int address_establish(Address *address, Link *link) {
 208         bool masq;
 209         int r;
 210
 211         assert(address);
 212         assert(link);
 213
 214         masq = link->network &&
 215                link->network->ip_masquerade &&
 216                address->family == AF_INET &&
 217                address->scope < RT_SCOPE_LINK;
 218
 219         /* Add firewall entry if this is requested */
 220         if (address->ip_masquerade_done != masq) {
 221                 union in_addr_union masked = address->in_addr;
 222                 in_addr_mask(address->family, &masked, address->prefixlen);
 223
 224                 r = fw_add_masquerade(masq, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 225                 if (r < 0)
 226                         return r;
 227
 228                 address->ip_masquerade_done = masq;
 229         }
 230
 231         return 0;
 232 }
 233
 234 static int address_add_internal(Link *link, Set **addresses,
 235                                 int family,
 236                                 const union in_addr_union *in_addr,
 237                                 unsigned char prefixlen,
 238                                 Address **ret) {
 239         _cleanup_(address_freep) Address *address = NULL;
 240         int r;
 241
 242         assert(link);
 243         assert(addresses);
 244         assert(in_addr);
 245
 246         r = address_new(&address);
 247         if (r < 0)
 248                 return r;
 249
 250         address->family = family;
 251         address->in_addr = *in_addr;
 252         address->prefixlen = prefixlen;
 253         /* Consider address tentative until we get the real flags from the kernel */
 254         address->flags = IFA_F_TENTATIVE;
 255
 256         r = set_ensure_allocated(addresses, &address_hash_ops);
 257         if (r < 0)
 258                 return r;
 259
 260         r = set_put(*addresses, address);
 261         if (r < 0)
 262                 return r;
 263         if (r == 0)
 264                 return -EEXIST;
 265
 266         address->link = link;
 267
 268         if (ret)
 269                 *ret = address;
 270
 271         address = NULL;
 272
 273         return 0;
 274 }
 275
 276 int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 277         return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret);
 278 }
 279
 280 int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 281         Address *address;
 282         int r;
 283
 284         r = address_get(link, family, in_addr, prefixlen, &address);
 285         if (r == -ENOENT) {
 286                 /* Address does not exist, create a new one */
 287                 r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address);
 288                 if (r < 0)
 289                         return r;
 290         } else if (r == 0) {
 291                 /* Take over a foreign address */
 292                 r = set_ensure_allocated(&link->addresses, &address_hash_ops);
 293                 if (r < 0)
 294                         return r;
 295
 296                 r = set_put(link->addresses, address);
 297                 if (r < 0)
 298                         return r;
 299
 300                 set_remove(link->addresses_foreign, address);
 301         } else if (r == 1) {
 302                 /* Already exists, do nothing */
 303                 ;
 304         } else
 305                 return r;
 306
 307         if (ret)
 308                 *ret = address;
 309
 310         return 0;
 311 }
 312
 313 static int address_release(Address *address) {
 314         int r;
 315
 316         assert(address);
 317         assert(address->link);
 318
 319         /* Remove masquerading firewall entry if it was added */
 320         if (address->ip_masquerade_done) {
 321                 union in_addr_union masked = address->in_addr;
 322                 in_addr_mask(address->family, &masked, address->prefixlen);
 323
 324                 r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 325                 if (r < 0)
 326                         return r;
 327
 328                 address->ip_masquerade_done = false;
 329         }
 330
 331         return 0;
 332 }
 333
 334 int address_update(
 335                 Address *address,
 336                 unsigned char flags,
 337                 unsigned char scope,
 338                 const struct ifa_cacheinfo *cinfo) {
 339
 340         bool ready;
 341         int r;
 342
 343         assert(address);
 344         assert(cinfo);
 345         assert_return(address->link, 1);
 346
 347         if (IN_SET(address->link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 348                 return 1;
 349
 350         ready = address_is_ready(address);
 351
 352         address->flags = flags;
 353         address->scope = scope;
 354         address->cinfo = *cinfo;
 355
 356         link_update_operstate(address->link, true);
 357         link_check_ready(address->link);
 358
 359         if (!ready &&
 360             address_is_ready(address) &&
 361             address->family == AF_INET6 &&
 362             in_addr_is_link_local(AF_INET6, &address->in_addr) > 0 &&
 363             in_addr_is_null(AF_INET6, (const union in_addr_union*) &address->link->ipv6ll_address) > 0) {
 364
 365                 r = link_ipv6ll_gained(address->link, &address->in_addr.in6);
 366                 if (r < 0)
 367                         return r;
 368         }
 369
 370         return 0;
 371 }
 372
 373 int address_drop(Address *address) {
 374         Link *link;
 375         bool ready;
 376         int r;
 377
 378         assert(address);
 379
 380         ready = address_is_ready(address);
 381         link = address->link;
 382
 383         r = address_release(address);
 384         if (r < 0)
 385                 log_link_warning_errno(link, r, "Failed to disable IP masquerading, ignoring: %m");
 386
 387         address_free(address);
 388
 389         link_update_operstate(link, true);
 390
 391         if (link && !ready)
 392                 link_check_ready(link);
 393
 394         return 0;
 395 }
 396
 397 int address_get(Link *link,
 398                 int family,
 399                 const union in_addr_union *in_addr,
 400                 unsigned char prefixlen,
 401                 Address **ret) {
 402
 403         Address address, *existing;
 404
 405         assert(link);
 406         assert(in_addr);
 407
 408         address = (Address) {
 409                 .family = family,
 410                 .in_addr = *in_addr,
 411                 .prefixlen = prefixlen,
 412         };
 413
 414         existing = set_get(link->addresses, &address);
 415         if (existing) {
 416                 if (ret)
 417                         *ret = existing;
 418                 return 1;
 419         }
 420
 421         existing = set_get(link->addresses_foreign, &address);
 422         if (existing) {
 423                 if (ret)
 424                         *ret = existing;
 425                 return 0;
 426         }
 427
 428         return -ENOENT;
 429 }
 430
 431 static int address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 432         int r;
 433
 434         assert(m);
 435         assert(link);
 436         assert(link->ifname);
 437
 438         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 439                 return 1;
 440
 441         r = sd_netlink_message_get_errno(m);
 442         if (r < 0 && r != -EADDRNOTAVAIL)
 443                 log_link_warning_errno(link, r, "Could not drop address: %m");
 444
 445         return 1;
 446 }
 447
 448 int address_remove(
 449                 Address *address,
 450                 Link *link,
 451                 link_netlink_message_handler_t callback) {
 452
 453         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 454         int r;
 455
 456         assert(address);
 457         assert(IN_SET(address->family, AF_INET, AF_INET6));
 458         assert(link);
 459         assert(link->ifindex > 0);
 460         assert(link->manager);
 461         assert(link->manager->rtnl);
 462
 463         if (DEBUG_LOGGING) {
 464                 _cleanup_free_ char *b = NULL;
 465
 466                 (void) in_addr_to_string(address->family, &address->in_addr, &b);
 467                 log_link_debug(link, "Removing address %s", strna(b));
 468         }
 469
 470         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 471                                      link->ifindex, address->family);
 472         if (r < 0)
 473                 return log_link_error_errno(link, r, "Could not allocate RTM_DELADDR message: %m");
 474
 475         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 476         if (r < 0)
 477                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 478
 479         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 480         if (r < 0)
 481                 return log_link_error_errno(link, r, "Could not append IFA_LOCAL attribute: %m");
 482
 483         r = netlink_call_async(link->manager->rtnl, NULL, req,
 484                                callback ?: address_remove_handler,
 485                                link_netlink_destroy_callback, link);
 486         if (r < 0)
 487                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 488
 489         link_ref(link);
 490
 491         return 0;
 492 }
 493
 494 static int address_acquire(Link *link, Address *original, Address **ret) {
 495         union in_addr_union in_addr = IN_ADDR_NULL;
 496         struct in_addr broadcast = {};
 497         _cleanup_(address_freep) Address *na = NULL;
 498         int r;
 499
 500         assert(link);
 501         assert(original);
 502         assert(ret);
 503
 504         /* Something useful was configured? just use it */
 505         r = in_addr_is_null(original->family, &original->in_addr);
 506         if (r <= 0)
 507                 return r;
 508
 509         /* The address is configured to be 0.0.0.0 or [::] by the user?
 510          * Then let's acquire something more useful from the pool. */
 511         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 512         if (r < 0)
 513                 return r;
 514         if (r == 0)
 515                 return -EBUSY;
 516
 517         if (original->family == AF_INET) {
 518                 /* Pick first address in range for ourselves ... */
 519                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 520
 521                 /* .. and use last as broadcast address */
 522                 if (original->prefixlen > 30)
 523                         broadcast.s_addr = 0;
 524                 else
 525                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 526         } else if (original->family == AF_INET6)
 527                 in_addr.in6.s6_addr[15] |= 1;
 528
 529         r = address_new(&na);
 530         if (r < 0)
 531                 return r;
 532
 533         na->family = original->family;
 534         na->prefixlen = original->prefixlen;
 535         na->scope = original->scope;
 536         na->cinfo = original->cinfo;
 537
 538         if (original->label) {
 539                 na->label = strdup(original->label);
 540                 if (!na->label)
 541                         return -ENOMEM;
 542         }
 543
 544         na->broadcast = broadcast;
 545         na->in_addr = in_addr;
 546
 547         LIST_PREPEND(addresses, link->pool_addresses, na);
 548
 549         *ret = TAKE_PTR(na);
 550
 551         return 0;
 552 }
 553
 554 int address_configure(
 555                 Address *address,
 556                 Link *link,
 557                 link_netlink_message_handler_t callback,
 558                 bool update) {
 559
 560         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 561         int r;
 562
 563         assert(address);
 564         assert(IN_SET(address->family, AF_INET, AF_INET6));
 565         assert(link);
 566         assert(link->ifindex > 0);
 567         assert(link->manager);
 568         assert(link->manager->rtnl);
 569         assert(callback);
 570
 571         /* If this is a new address, then refuse adding more than the limit */
 572         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 573             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 574                 return log_link_error_errno(link, SYNTHETIC_ERRNO(E2BIG),
 575                                             "Too many addresses are configured, refusing: %m");
 576
 577         r = address_acquire(link, address, &address);
 578         if (r < 0)
 579                 return log_link_error_errno(link, r, "Failed to acquire an address from pool: %m");
 580
 581         if (update)
 582                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 583                                                     link->ifindex, address->family);
 584         else
 585                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 586                                              link->ifindex, address->family);
 587         if (r < 0)
 588                 return log_link_error_errno(link, r, "Could not allocate RTM_NEWADDR message: %m");
 589
 590         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 591         if (r < 0)
 592                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 593
 594         address->flags |= IFA_F_PERMANENT;
 595
 596         if (address->home_address)
 597                 address->flags |= IFA_F_HOMEADDRESS;
 598
 599         if (address->duplicate_address_detection)
 600                 address->flags |= IFA_F_NODAD;
 601
 602         if (address->manage_temporary_address)
 603                 address->flags |= IFA_F_MANAGETEMPADDR;
 604
 605         if (address->prefix_route)
 606                 address->flags |= IFA_F_NOPREFIXROUTE;
 607
 608         if (address->autojoin)
 609                 address->flags |= IFA_F_MCAUTOJOIN;
 610
 611         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 612         if (r < 0)
 613                 return log_link_error_errno(link, r, "Could not set flags: %m");
 614
 615         if (address->flags & ~0xff) {
 616                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 617                 if (r < 0)
 618                         return log_link_error_errno(link, r, "Could not set extended flags: %m");
 619         }
 620
 621         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 622         if (r < 0)
 623                 return log_link_error_errno(link, r, "Could not set scope: %m");
 624
 625         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 626         if (r < 0)
 627                 return log_link_error_errno(link, r, "Could not append IFA_LOCAL attribute: %m");
 628
 629         if (in_addr_is_null(address->family, &address->in_addr_peer) == 0) {
 630                 r = netlink_message_append_in_addr_union(req, IFA_ADDRESS, address->family, &address->in_addr_peer);
 631                 if (r < 0)
 632                         return log_link_error_errno(link, r, "Could not append IFA_ADDRESS attribute: %m");
 633         } else if (address->family == AF_INET && address->prefixlen <= 30) {
 634                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 635                 if (r < 0)
 636                         return log_link_error_errno(link, r, "Could not append IFA_BROADCAST attribute: %m");
 637         }
 638
 639         if (address->label) {
 640                 r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
 641                 if (r < 0)
 642                         return log_link_error_errno(link, r, "Could not append IFA_LABEL attribute: %m");
 643         }
 644
 645         r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
 646         if (r < 0)
 647                 return log_link_error_errno(link, r, "Could not append IFA_CACHEINFO attribute: %m");
 648
 649         r = address_establish(address, link);
 650         if (r < 0)
 651                 log_link_warning_errno(link, r, "Could not enable IP masquerading, ignoring: %m");
 652
 653         r = netlink_call_async(link->manager->rtnl, NULL, req, callback, link_netlink_destroy_callback, link);
 654         if (r < 0) {
 655                 address_release(address);
 656                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 657         }
 658
 659         link_ref(link);
 660
 661         if (address->family == AF_INET6 && !in_addr_is_null(address->family, &address->in_addr_peer))
 662                 r = address_add(link, address->family, &address->in_addr_peer, address->prefixlen, NULL);
 663         else
 664                 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 665         if (r < 0) {
 666                 address_release(address);
 667                 return log_link_error_errno(link, r, "Could not add address: %m");
 668         }
 669
 670         return 1;
 671 }
 672
 673 int config_parse_broadcast(
 674                 const char *unit,
 675                 const char *filename,
 676                 unsigned line,
 677                 const char *section,
 678                 unsigned section_line,
 679                 const char *lvalue,
 680                 int ltype,
 681                 const char *rvalue,
 682                 void *data,
 683                 void *userdata) {
 684
 685         Network *network = userdata;
 686         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 687         int r;
 688
 689         assert(filename);
 690         assert(section);
 691         assert(lvalue);
 692         assert(rvalue);
 693         assert(data);
 694
 695         r = address_new_static(network, filename, section_line, &n);
 696         if (r < 0)
 697                 return r;
 698
 699         if (n->family == AF_INET6) {
 700                 log_syntax(unit, LOG_ERR, filename, line, 0,
 701                            "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 702                 return 0;
 703         }
 704
 705         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 706         if (r < 0) {
 707                 log_syntax(unit, LOG_ERR, filename, line, r,
 708                            "Broadcast is invalid, ignoring assignment: %s", rvalue);
 709                 return 0;
 710         }
 711
 712         n->family = AF_INET;
 713         n = NULL;
 714
 715         return 0;
 716 }
 717
 718 int config_parse_address(const char *unit,
 719                 const char *filename,
 720                 unsigned line,
 721                 const char *section,
 722                 unsigned section_line,
 723                 const char *lvalue,
 724                 int ltype,
 725                 const char *rvalue,
 726                 void *data,
 727                 void *userdata) {
 728
 729         Network *network = userdata;
 730         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 731         union in_addr_union buffer;
 732         unsigned char prefixlen;
 733         int r, f;
 734
 735         assert(filename);
 736         assert(section);
 737         assert(lvalue);
 738         assert(rvalue);
 739         assert(data);
 740
 741         if (streq(section, "Network")) {
 742                 /* we are not in an Address section, so treat
 743                  * this as the special '0' section */
 744                 r = address_new_static(network, NULL, 0, &n);
 745         } else
 746                 r = address_new_static(network, filename, section_line, &n);
 747
 748         if (r < 0)
 749                 return r;
 750
 751         /* Address=address/prefixlen */
 752         r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_REFUSE, &f, &buffer, &prefixlen);
 753         if (r == -ENOANO) {
 754                 log_syntax(unit, LOG_ERR, filename, line, r,
 755                            "An address '%s' is specified without prefix length. "
 756                            "The behavior of parsing addresses without prefix length will be changed in the future release. "
 757                            "Please specify prefix length explicitly.", rvalue);
 758
 759                 r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_LEGACY, &f, &buffer, &prefixlen);
 760         }
 761         if (r < 0) {
 762                 log_syntax(unit, LOG_ERR, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue);
 763                 return 0;
 764         }
 765
 766         if (n->family != AF_UNSPEC && f != n->family) {
 767                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue);
 768                 return 0;
 769         }
 770
 771         if (in_addr_is_null(f, &buffer)) {
 772                 /* Will use address from address pool. Note that for ipv6 case, prefix of the address
 773                  * pool is 8, but 40 bit is used by the global ID and 16 bit by the subnet ID. So,
 774                  * let's limit the prefix length to 64 or larger. See RFC4193. */
 775                 if ((f == AF_INET && prefixlen < 8) ||
 776                     (f == AF_INET6 && prefixlen < 64)) {
 777                         log_syntax(unit, LOG_ERR, filename, line, 0,
 778                                    "Null address with invalid prefixlen='%u', ignoring assignment: %s",
 779                                    prefixlen, rvalue);
 780                         return 0;
 781                 }
 782         }
 783
 784         n->family = f;
 785         n->prefixlen = prefixlen;
 786
 787         if (streq(lvalue, "Address"))
 788                 n->in_addr = buffer;
 789         else
 790                 n->in_addr_peer = buffer;
 791
 792         if (n->family == AF_INET && n->broadcast.s_addr == 0 && n->prefixlen <= 30)
 793                 n->broadcast.s_addr = n->in_addr.in.s_addr | htobe32(0xfffffffflu >> n->prefixlen);
 794
 795         n = NULL;
 796
 797         return 0;
 798 }
 799
 800 int config_parse_label(
 801                 const char *unit,
 802                 const char *filename,
 803                 unsigned line,
 804                 const char *section,
 805                 unsigned section_line,
 806                 const char *lvalue,
 807                 int ltype,
 808                 const char *rvalue,
 809                 void *data,
 810                 void *userdata) {
 811
 812         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 813         Network *network = userdata;
 814         int r;
 815
 816         assert(filename);
 817         assert(section);
 818         assert(lvalue);
 819         assert(rvalue);
 820         assert(data);
 821
 822         r = address_new_static(network, filename, section_line, &n);
 823         if (r < 0)
 824                 return r;
 825
 826         if (!address_label_valid(rvalue)) {
 827                 log_syntax(unit, LOG_ERR, filename, line, 0,
 828                            "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 829                 return 0;
 830         }
 831
 832         r = free_and_strdup(&n->label, rvalue);
 833         if (r < 0)
 834                 return log_oom();
 835
 836         n = NULL;
 837         return 0;
 838 }
 839
 840 int config_parse_lifetime(const char *unit,
 841                           const char *filename,
 842                           unsigned line,
 843                           const char *section,
 844                           unsigned section_line,
 845                           const char *lvalue,
 846                           int ltype,
 847                           const char *rvalue,
 848                           void *data,
 849                           void *userdata) {
 850         Network *network = userdata;
 851         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 852         unsigned k;
 853         int r;
 854
 855         assert(filename);
 856         assert(section);
 857         assert(lvalue);
 858         assert(rvalue);
 859         assert(data);
 860
 861         r = address_new_static(network, filename, section_line, &n);
 862         if (r < 0)
 863                 return r;
 864
 865         /* We accept only "forever", "infinity", or "0". */
 866         if (STR_IN_SET(rvalue, "forever", "infinity"))
 867                 k = CACHE_INFO_INFINITY_LIFE_TIME;
 868         else if (streq(rvalue, "0"))
 869                 k = 0;
 870         else {
 871                 log_syntax(unit, LOG_ERR, filename, line, 0,
 872                            "Invalid PreferredLifetime= value, ignoring: %s", rvalue);
 873                 return 0;
 874         }
 875
 876         n->cinfo.ifa_prefered = k;
 877         n = NULL;
 878
 879         return 0;
 880 }
 881
 882 int config_parse_address_flags(const char *unit,
 883                                const char *filename,
 884                                unsigned line,
 885                                const char *section,
 886                                unsigned section_line,
 887                                const char *lvalue,
 888                                int ltype,
 889                                const char *rvalue,
 890                                void *data,
 891                                void *userdata) {
 892         Network *network = userdata;
 893         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 894         int r;
 895
 896         assert(filename);
 897         assert(section);
 898         assert(lvalue);
 899         assert(rvalue);
 900         assert(data);
 901
 902         r = address_new_static(network, filename, section_line, &n);
 903         if (r < 0)
 904                 return r;
 905
 906         r = parse_boolean(rvalue);
 907         if (r < 0) {
 908                 log_syntax(unit, LOG_ERR, filename, line, r,
 909                            "Failed to parse address flag, ignoring: %s", rvalue);
 910                 return 0;
 911         }
 912
 913         if (streq(lvalue, "HomeAddress"))
 914                 n->home_address = r;
 915         else if (streq(lvalue, "DuplicateAddressDetection"))
 916                 n->duplicate_address_detection = r;
 917         else if (streq(lvalue, "ManageTemporaryAddress"))
 918                 n->manage_temporary_address = r;
 919         else if (streq(lvalue, "PrefixRoute"))
 920                 n->prefix_route = r;
 921         else if (streq(lvalue, "AutoJoin"))
 922                 n->autojoin = r;
 923         else
 924                 assert_not_reached("Invalid address flag type.");
 925
 926         n = NULL;
 927         return 0;
 928 }
 929
 930 int config_parse_address_scope(const char *unit,
 931                                const char *filename,
 932                                unsigned line,
 933                                const char *section,
 934                                unsigned section_line,
 935                                const char *lvalue,
 936                                int ltype,
 937                                const char *rvalue,
 938                                void *data,
 939                                void *userdata) {
 940         Network *network = userdata;
 941         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 942         int r;
 943
 944         assert(filename);
 945         assert(section);
 946         assert(lvalue);
 947         assert(rvalue);
 948         assert(data);
 949
 950         r = address_new_static(network, filename, section_line, &n);
 951         if (r < 0)
 952                 return r;
 953
 954         if (streq(rvalue, "host"))
 955                 n->scope = RT_SCOPE_HOST;
 956         else if (streq(rvalue, "link"))
 957                 n->scope = RT_SCOPE_LINK;
 958         else if (streq(rvalue, "global"))
 959                 n->scope = RT_SCOPE_UNIVERSE;
 960         else {
 961                 r = safe_atou8(rvalue , &n->scope);
 962                 if (r < 0) {
 963                         log_syntax(unit, LOG_ERR, filename, line, r,
 964                                    "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
 965                         return 0;
 966                 }
 967         }
 968
 969         n = NULL;
 970         return 0;
 971 }
 972
 973 bool address_is_ready(const Address *a) {
 974         assert(a);
 975
 976         return !(a->flags & IFA_F_TENTATIVE);
 977 }
 978
 979 int address_section_verify(Address *address) {
 980         if (section_is_invalid(address->section))
 981                 return -EINVAL;
 982
 983         if (address->family == AF_UNSPEC) {
 984                 assert(address->section);
 985
 986                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
 987                                          "%s: Address section without Address= field configured. "
 988                                          "Ignoring [Address] section from line %u.",
 989                                          address->section->filename, address->section->line);
 990         }
 991
 992         return 0;
 993 }