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 "missing_network.h"
   9 #include "netlink-util.h"
  10 #include "networkd-address.h"
  11 #include "networkd-manager.h"
  12 #include "parse-util.h"
  13 #include "set.h"
  14 #include "socket-util.h"
  15 #include "string-util.h"
  16 #include "strv.h"
  17 #include "utf8.h"
  18 #include "util.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 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                         log_link_warning_errno(link, r, "Could not enable IP masquerading: %m");
 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
 264         address->link = link;
 265
 266         if (ret)
 267                 *ret = address;
 268
 269         address = NULL;
 270
 271         return 0;
 272 }
 273
 274 int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 275         return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret);
 276 }
 277
 278 int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 279         Address *address;
 280         int r;
 281
 282         r = address_get(link, family, in_addr, prefixlen, &address);
 283         if (r == -ENOENT) {
 284                 /* Address does not exist, create a new one */
 285                 r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address);
 286                 if (r < 0)
 287                         return r;
 288         } else if (r == 0) {
 289                 /* Take over a foreign address */
 290                 r = set_ensure_allocated(&link->addresses, &address_hash_ops);
 291                 if (r < 0)
 292                         return r;
 293
 294                 r = set_put(link->addresses, address);
 295                 if (r < 0)
 296                         return r;
 297
 298                 set_remove(link->addresses_foreign, address);
 299         } else if (r == 1) {
 300                 /* Already exists, do nothing */
 301                 ;
 302         } else
 303                 return r;
 304
 305         if (ret)
 306                 *ret = address;
 307
 308         return 0;
 309 }
 310
 311 static int address_release(Address *address) {
 312         int r;
 313
 314         assert(address);
 315         assert(address->link);
 316
 317         /* Remove masquerading firewall entry if it was added */
 318         if (address->ip_masquerade_done) {
 319                 union in_addr_union masked = address->in_addr;
 320                 in_addr_mask(address->family, &masked, address->prefixlen);
 321
 322                 r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 323                 if (r < 0)
 324                         log_link_warning_errno(address->link, r, "Failed to disable IP masquerading: %m");
 325
 326                 address->ip_masquerade_done = false;
 327         }
 328
 329         return 0;
 330 }
 331
 332 int address_update(
 333                 Address *address,
 334                 unsigned char flags,
 335                 unsigned char scope,
 336                 const struct ifa_cacheinfo *cinfo) {
 337
 338         bool ready;
 339         int r;
 340
 341         assert(address);
 342         assert(cinfo);
 343         assert_return(address->link, 1);
 344
 345         if (IN_SET(address->link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 346                 return 1;
 347
 348         ready = address_is_ready(address);
 349
 350         address->flags = flags;
 351         address->scope = scope;
 352         address->cinfo = *cinfo;
 353
 354         link_update_operstate(address->link, true);
 355         link_check_ready(address->link);
 356
 357         if (!ready &&
 358             address_is_ready(address) &&
 359             address->family == AF_INET6 &&
 360             in_addr_is_link_local(AF_INET6, &address->in_addr) > 0 &&
 361             in_addr_is_null(AF_INET6, (const union in_addr_union*) &address->link->ipv6ll_address) > 0) {
 362
 363                 r = link_ipv6ll_gained(address->link, &address->in_addr.in6);
 364                 if (r < 0)
 365                         return r;
 366         }
 367
 368         return 0;
 369 }
 370
 371 int address_drop(Address *address) {
 372         Link *link;
 373         bool ready;
 374
 375         assert(address);
 376
 377         ready = address_is_ready(address);
 378         link = address->link;
 379
 380         address_release(address);
 381         address_free(address);
 382
 383         link_update_operstate(link, true);
 384
 385         if (link && !ready)
 386                 link_check_ready(link);
 387
 388         return 0;
 389 }
 390
 391 int address_get(Link *link,
 392                 int family,
 393                 const union in_addr_union *in_addr,
 394                 unsigned char prefixlen,
 395                 Address **ret) {
 396
 397         Address address, *existing;
 398
 399         assert(link);
 400         assert(in_addr);
 401
 402         address = (Address) {
 403                 .family = family,
 404                 .in_addr = *in_addr,
 405                 .prefixlen = prefixlen,
 406         };
 407
 408         existing = set_get(link->addresses, &address);
 409         if (existing) {
 410                 if (ret)
 411                         *ret = existing;
 412                 return 1;
 413         }
 414
 415         existing = set_get(link->addresses_foreign, &address);
 416         if (existing) {
 417                 if (ret)
 418                         *ret = existing;
 419                 return 0;
 420         }
 421
 422         return -ENOENT;
 423 }
 424
 425 static int address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 426         int r;
 427
 428         assert(m);
 429         assert(link);
 430         assert(link->ifname);
 431
 432         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 433                 return 1;
 434
 435         r = sd_netlink_message_get_errno(m);
 436         if (r < 0 && r != -EADDRNOTAVAIL)
 437                 log_link_warning_errno(link, r, "Could not drop address: %m");
 438
 439         return 1;
 440 }
 441
 442 int address_remove(
 443                 Address *address,
 444                 Link *link,
 445                 link_netlink_message_handler_t callback) {
 446
 447         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 448         _cleanup_free_ char *b = NULL;
 449         int r;
 450
 451         assert(address);
 452         assert(IN_SET(address->family, AF_INET, AF_INET6));
 453         assert(link);
 454         assert(link->ifindex > 0);
 455         assert(link->manager);
 456         assert(link->manager->rtnl);
 457
 458         if (DEBUG_LOGGING) {
 459                 if (in_addr_to_string(address->family, &address->in_addr, &b) >= 0)
 460                         log_link_debug(link, "Removing address %s", b);
 461         }
 462
 463         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 464                                      link->ifindex, address->family);
 465         if (r < 0)
 466                 return log_error_errno(r, "Could not allocate RTM_DELADDR message: %m");
 467
 468         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 469         if (r < 0)
 470                 return log_error_errno(r, "Could not set prefixlen: %m");
 471
 472         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 473         if (r < 0)
 474                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 475
 476         r = netlink_call_async(link->manager->rtnl, NULL, req,
 477                                callback ?: address_remove_handler,
 478                                link_netlink_destroy_callback, link);
 479         if (r < 0)
 480                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 481
 482         link_ref(link);
 483
 484         return 0;
 485 }
 486
 487 static int address_acquire(Link *link, Address *original, Address **ret) {
 488         union in_addr_union in_addr = {};
 489         struct in_addr broadcast = {};
 490         _cleanup_(address_freep) Address *na = NULL;
 491         int r;
 492
 493         assert(link);
 494         assert(original);
 495         assert(ret);
 496
 497         /* Something useful was configured? just use it */
 498         if (in_addr_is_null(original->family, &original->in_addr) <= 0)
 499                 return 0;
 500
 501         /* The address is configured to be 0.0.0.0 or [::] by the user?
 502          * Then let's acquire something more useful from the pool. */
 503         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 504         if (r < 0)
 505                 return log_link_error_errno(link, r, "Failed to acquire address from pool: %m");
 506         if (r == 0) {
 507                 log_link_error(link, "Couldn't find free address for interface, all taken.");
 508                 return -EBUSY;
 509         }
 510
 511         if (original->family == AF_INET) {
 512                 /* Pick first address in range for ourselves ... */
 513                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 514
 515                 /* .. and use last as broadcast address */
 516                 if (original->prefixlen > 30)
 517                         broadcast.s_addr = 0;
 518                 else
 519                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 520         } else if (original->family == AF_INET6)
 521                 in_addr.in6.s6_addr[15] |= 1;
 522
 523         r = address_new(&na);
 524         if (r < 0)
 525                 return r;
 526
 527         na->family = original->family;
 528         na->prefixlen = original->prefixlen;
 529         na->scope = original->scope;
 530         na->cinfo = original->cinfo;
 531
 532         if (original->label) {
 533                 na->label = strdup(original->label);
 534                 if (!na->label)
 535                         return -ENOMEM;
 536         }
 537
 538         na->broadcast = broadcast;
 539         na->in_addr = in_addr;
 540
 541         LIST_PREPEND(addresses, link->pool_addresses, na);
 542
 543         *ret = TAKE_PTR(na);
 544
 545         return 0;
 546 }
 547
 548 int address_configure(
 549                 Address *address,
 550                 Link *link,
 551                 link_netlink_message_handler_t callback,
 552                 bool update) {
 553
 554         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 555         int r;
 556
 557         assert(address);
 558         assert(IN_SET(address->family, AF_INET, AF_INET6));
 559         assert(link);
 560         assert(link->ifindex > 0);
 561         assert(link->manager);
 562         assert(link->manager->rtnl);
 563         assert(callback);
 564
 565         /* If this is a new address, then refuse adding more than the limit */
 566         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 567             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 568                 return -E2BIG;
 569
 570         r = address_acquire(link, address, &address);
 571         if (r < 0)
 572                 return r;
 573
 574         if (update)
 575                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 576                                                     link->ifindex, address->family);
 577         else
 578                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 579                                              link->ifindex, address->family);
 580         if (r < 0)
 581                 return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
 582
 583         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 584         if (r < 0)
 585                 return log_error_errno(r, "Could not set prefixlen: %m");
 586
 587         address->flags |= IFA_F_PERMANENT;
 588
 589         if (address->home_address)
 590                 address->flags |= IFA_F_HOMEADDRESS;
 591
 592         if (address->duplicate_address_detection)
 593                 address->flags |= IFA_F_NODAD;
 594
 595         if (address->manage_temporary_address)
 596                 address->flags |= IFA_F_MANAGETEMPADDR;
 597
 598         if (address->prefix_route)
 599                 address->flags |= IFA_F_NOPREFIXROUTE;
 600
 601         if (address->autojoin)
 602                 address->flags |= IFA_F_MCAUTOJOIN;
 603
 604         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 605         if (r < 0)
 606                 return log_error_errno(r, "Could not set flags: %m");
 607
 608         if (address->flags & ~0xff) {
 609                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 610                 if (r < 0)
 611                         return log_error_errno(r, "Could not set extended flags: %m");
 612         }
 613
 614         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 615         if (r < 0)
 616                 return log_error_errno(r, "Could not set scope: %m");
 617
 618         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 619         if (r < 0)
 620                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 621
 622         if (in_addr_is_null(address->family, &address->in_addr_peer) == 0) {
 623                 r = netlink_message_append_in_addr_union(req, IFA_ADDRESS, address->family, &address->in_addr_peer);
 624                 if (r < 0)
 625                         return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
 626         } else if (address->family == AF_INET && address->prefixlen <= 30) {
 627                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 628                 if (r < 0)
 629                         return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
 630         }
 631
 632         if (address->label) {
 633                 r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
 634                 if (r < 0)
 635                         return log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
 636         }
 637
 638         r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
 639         if (r < 0)
 640                 return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
 641
 642         r = address_establish(address, link);
 643         if (r < 0)
 644                 return r;
 645
 646         r = netlink_call_async(link->manager->rtnl, NULL, req, callback, link_netlink_destroy_callback, link);
 647         if (r < 0) {
 648                 address_release(address);
 649                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 650         }
 651
 652         link_ref(link);
 653
 654         if (address->family == AF_INET6 && !in_addr_is_null(address->family, &address->in_addr_peer))
 655                 r = address_add(link, address->family, &address->in_addr_peer, address->prefixlen, NULL);
 656         else
 657                 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 658         if (r < 0) {
 659                 address_release(address);
 660                 return log_error_errno(r, "Could not add address: %m");
 661         }
 662
 663         return 0;
 664 }
 665
 666 int config_parse_broadcast(
 667                 const char *unit,
 668                 const char *filename,
 669                 unsigned line,
 670                 const char *section,
 671                 unsigned section_line,
 672                 const char *lvalue,
 673                 int ltype,
 674                 const char *rvalue,
 675                 void *data,
 676                 void *userdata) {
 677
 678         Network *network = userdata;
 679         _cleanup_(address_freep) Address *n = NULL;
 680         int r;
 681
 682         assert(filename);
 683         assert(section);
 684         assert(lvalue);
 685         assert(rvalue);
 686         assert(data);
 687
 688         r = address_new_static(network, filename, section_line, &n);
 689         if (r < 0)
 690                 return r;
 691
 692         if (n->family == AF_INET6) {
 693                 log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 694                 return 0;
 695         }
 696
 697         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 698         if (r < 0) {
 699                 log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue);
 700                 return 0;
 701         }
 702
 703         n->family = AF_INET;
 704         n = NULL;
 705
 706         return 0;
 707 }
 708
 709 int config_parse_address(const char *unit,
 710                 const char *filename,
 711                 unsigned line,
 712                 const char *section,
 713                 unsigned section_line,
 714                 const char *lvalue,
 715                 int ltype,
 716                 const char *rvalue,
 717                 void *data,
 718                 void *userdata) {
 719
 720         Network *network = userdata;
 721         _cleanup_(address_freep) Address *n = NULL;
 722         union in_addr_union buffer;
 723         unsigned char prefixlen;
 724         int r, f;
 725
 726         assert(filename);
 727         assert(section);
 728         assert(lvalue);
 729         assert(rvalue);
 730         assert(data);
 731
 732         if (streq(section, "Network")) {
 733                 /* we are not in an Address section, so treat
 734                  * this as the special '0' section */
 735                 r = address_new_static(network, NULL, 0, &n);
 736         } else
 737                 r = address_new_static(network, filename, section_line, &n);
 738
 739         if (r < 0)
 740                 return r;
 741
 742         /* Address=address/prefixlen */
 743         r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_REFUSE, &f, &buffer, &prefixlen);
 744         if (r == -ENOANO) {
 745                 log_syntax(unit, LOG_ERR, filename, line, r,
 746                            "An address '%s' is specified without prefix length. "
 747                            "The behavior of parsing addresses without prefix length will be changed in the future release. "
 748                            "Please specify prefix length explicitly.", rvalue);
 749
 750                 r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_LEGACY, &f, &buffer, &prefixlen);
 751         }
 752         if (r < 0) {
 753                 log_syntax(unit, LOG_ERR, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue);
 754                 return 0;
 755         }
 756
 757         if (n->family != AF_UNSPEC && f != n->family) {
 758                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue);
 759                 return 0;
 760         }
 761
 762         n->family = f;
 763         n->prefixlen = prefixlen;
 764
 765         if (streq(lvalue, "Address"))
 766                 n->in_addr = buffer;
 767         else
 768                 n->in_addr_peer = buffer;
 769
 770         if (n->family == AF_INET && n->broadcast.s_addr == 0)
 771                 n->broadcast.s_addr = n->in_addr.in.s_addr | htonl(0xfffffffflu >> n->prefixlen);
 772
 773         n = NULL;
 774
 775         return 0;
 776 }
 777
 778 int config_parse_label(
 779                 const char *unit,
 780                 const char *filename,
 781                 unsigned line,
 782                 const char *section,
 783                 unsigned section_line,
 784                 const char *lvalue,
 785                 int ltype,
 786                 const char *rvalue,
 787                 void *data,
 788                 void *userdata) {
 789
 790         _cleanup_(address_freep) Address *n = NULL;
 791         Network *network = userdata;
 792         int r;
 793
 794         assert(filename);
 795         assert(section);
 796         assert(lvalue);
 797         assert(rvalue);
 798         assert(data);
 799
 800         r = address_new_static(network, filename, section_line, &n);
 801         if (r < 0)
 802                 return r;
 803
 804         if (!address_label_valid(rvalue)) {
 805                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 806                 return 0;
 807         }
 808
 809         r = free_and_strdup(&n->label, rvalue);
 810         if (r < 0)
 811                 return log_oom();
 812
 813         n = NULL;
 814
 815         return 0;
 816 }
 817
 818 int config_parse_lifetime(const char *unit,
 819                           const char *filename,
 820                           unsigned line,
 821                           const char *section,
 822                           unsigned section_line,
 823                           const char *lvalue,
 824                           int ltype,
 825                           const char *rvalue,
 826                           void *data,
 827                           void *userdata) {
 828         Network *network = userdata;
 829         _cleanup_(address_freep) Address *n = NULL;
 830         unsigned k;
 831         int r;
 832
 833         assert(filename);
 834         assert(section);
 835         assert(lvalue);
 836         assert(rvalue);
 837         assert(data);
 838
 839         r = address_new_static(network, filename, section_line, &n);
 840         if (r < 0)
 841                 return r;
 842
 843         if (STR_IN_SET(rvalue, "forever", "infinity")) {
 844                 n->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
 845                 n = NULL;
 846
 847                 return 0;
 848         }
 849
 850         r = safe_atou(rvalue, &k);
 851         if (r < 0) {
 852                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse PreferredLifetime, ignoring: %s", rvalue);
 853                 return 0;
 854         }
 855
 856         if (k != 0)
 857                 log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid PreferredLifetime value, ignoring: %d", k);
 858         else {
 859                 n->cinfo.ifa_prefered = k;
 860                 n = NULL;
 861         }
 862
 863         return 0;
 864 }
 865
 866 int config_parse_address_flags(const char *unit,
 867                                const char *filename,
 868                                unsigned line,
 869                                const char *section,
 870                                unsigned section_line,
 871                                const char *lvalue,
 872                                int ltype,
 873                                const char *rvalue,
 874                                void *data,
 875                                void *userdata) {
 876         Network *network = userdata;
 877         _cleanup_(address_freep) Address *n = NULL;
 878         int r;
 879
 880         assert(filename);
 881         assert(section);
 882         assert(lvalue);
 883         assert(rvalue);
 884         assert(data);
 885
 886         r = address_new_static(network, filename, section_line, &n);
 887         if (r < 0)
 888                 return r;
 889
 890         r = parse_boolean(rvalue);
 891         if (r < 0) {
 892                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 893                 return 0;
 894         }
 895
 896         if (streq(lvalue, "HomeAddress"))
 897                 n->home_address = r;
 898         else if (streq(lvalue, "DuplicateAddressDetection"))
 899                 n->duplicate_address_detection = r;
 900         else if (streq(lvalue, "ManageTemporaryAddress"))
 901                 n->manage_temporary_address = r;
 902         else if (streq(lvalue, "PrefixRoute"))
 903                 n->prefix_route = r;
 904         else if (streq(lvalue, "AutoJoin"))
 905                 n->autojoin = r;
 906
 907         return 0;
 908 }
 909
 910 int config_parse_address_scope(const char *unit,
 911                                const char *filename,
 912                                unsigned line,
 913                                const char *section,
 914                                unsigned section_line,
 915                                const char *lvalue,
 916                                int ltype,
 917                                const char *rvalue,
 918                                void *data,
 919                                void *userdata) {
 920         Network *network = userdata;
 921         _cleanup_(address_freep) Address *n = NULL;
 922         int r;
 923
 924         assert(filename);
 925         assert(section);
 926         assert(lvalue);
 927         assert(rvalue);
 928         assert(data);
 929
 930         r = address_new_static(network, filename, section_line, &n);
 931         if (r < 0)
 932                 return r;
 933
 934         if (streq(rvalue, "host"))
 935                 n->scope = RT_SCOPE_HOST;
 936         else if (streq(rvalue, "link"))
 937                 n->scope = RT_SCOPE_LINK;
 938         else if (streq(rvalue, "global"))
 939                 n->scope = RT_SCOPE_UNIVERSE;
 940         else {
 941                 r = safe_atou8(rvalue , &n->scope);
 942                 if (r < 0) {
 943                         log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
 944                         return 0;
 945                 }
 946         }
 947
 948         n = NULL;
 949
 950         return 0;
 951 }
 952
 953 bool address_is_ready(const Address *a) {
 954         assert(a);
 955
 956         if (a->family == AF_INET6)
 957                 return !(a->flags & IFA_F_TENTATIVE);
 958         else
 959                 return !(a->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED));
 960 }