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 "netlink-util.h"
   9 #include "networkd-address.h"
  10 #include "networkd-manager.h"
  11 #include "parse-util.h"
  12 #include "set.h"
  13 #include "socket-util.h"
  14 #include "string-util.h"
  15 #include "strv.h"
  16 #include "utf8.h"
  17 #include "util.h"
  18
  19 #define ADDRESSES_PER_LINK_MAX 2048U
  20 #define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
  21
  22 int address_new(Address **ret) {
  23         _cleanup_(address_freep) Address *address = NULL;
  24
  25         address = new(Address, 1);
  26         if (!address)
  27                 return -ENOMEM;
  28
  29         *address = (Address) {
  30                 .family = AF_UNSPEC,
  31                 .scope = RT_SCOPE_UNIVERSE,
  32                 .cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME,
  33                 .cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME,
  34         };
  35
  36         *ret = TAKE_PTR(address);
  37
  38         return 0;
  39 }
  40
  41 int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) {
  42         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  43         _cleanup_(address_freep) Address *address = NULL;
  44         int r;
  45
  46         assert(network);
  47         assert(ret);
  48         assert(!!filename == (section_line > 0));
  49
  50         if (filename) {
  51                 r = network_config_section_new(filename, section_line, &n);
  52                 if (r < 0)
  53                         return r;
  54
  55                 address = hashmap_get(network->addresses_by_section, n);
  56                 if (address) {
  57                         *ret = TAKE_PTR(address);
  58
  59                         return 0;
  60                 }
  61         }
  62
  63         if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX)
  64                 return -E2BIG;
  65
  66         r = address_new(&address);
  67         if (r < 0)
  68                 return r;
  69
  70         address->network = network;
  71         LIST_APPEND(addresses, network->static_addresses, address);
  72         network->n_static_addresses++;
  73
  74         if (filename) {
  75                 address->section = TAKE_PTR(n);
  76
  77                 r = hashmap_ensure_allocated(&network->addresses_by_section, &network_config_hash_ops);
  78                 if (r < 0)
  79                         return r;
  80
  81                 r = hashmap_put(network->addresses_by_section, address->section, address);
  82                 if (r < 0)
  83                         return r;
  84         }
  85
  86         *ret = TAKE_PTR(address);
  87
  88         return 0;
  89 }
  90
  91 void address_free(Address *address) {
  92         if (!address)
  93                 return;
  94
  95         if (address->network) {
  96                 LIST_REMOVE(addresses, address->network->static_addresses, address);
  97                 assert(address->network->n_static_addresses > 0);
  98                 address->network->n_static_addresses--;
  99
 100                 if (address->section)
 101                         hashmap_remove(address->network->addresses_by_section, address->section);
 102         }
 103
 104         if (address->link) {
 105                 set_remove(address->link->addresses, address);
 106                 set_remove(address->link->addresses_foreign, address);
 107
 108                 if (in_addr_equal(AF_INET6, &address->in_addr, (const union in_addr_union *) &address->link->ipv6ll_address))
 109                         memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr));
 110         }
 111
 112         network_config_section_free(address->section);
 113         free(address->label);
 114         free(address);
 115 }
 116
 117 static void address_hash_func(const void *b, struct siphash *state) {
 118         const Address *a = b;
 119
 120         assert(a);
 121
 122         siphash24_compress(&a->family, sizeof(a->family), state);
 123
 124         switch (a->family) {
 125         case AF_INET:
 126                 siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
 127
 128                 /* peer prefix */
 129                 if (a->prefixlen != 0) {
 130                         uint32_t prefix;
 131
 132                         if (a->in_addr_peer.in.s_addr != 0)
 133                                 prefix = be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen);
 134                         else
 135                                 prefix = be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen);
 136
 137                         siphash24_compress(&prefix, sizeof(prefix), state);
 138                 }
 139
 140                 _fallthrough_;
 141         case AF_INET6:
 142                 /* local address */
 143                 siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
 144
 145                 break;
 146         default:
 147                 /* treat any other address family as AF_UNSPEC */
 148                 break;
 149         }
 150 }
 151
 152 static int address_compare_func(const void *c1, const void *c2) {
 153         const Address *a1 = c1, *a2 = c2;
 154         int r;
 155
 156         r = CMP(a1->family, a2->family);
 157         if (r != 0)
 158                 return r;
 159
 160         switch (a1->family) {
 161         /* use the same notion of equality as the kernel does */
 162         case AF_INET:
 163                 r = CMP(a1->prefixlen, a2->prefixlen);
 164                 if (r != 0)
 165                         return r;
 166
 167                 /* compare the peer prefixes */
 168                 if (a1->prefixlen != 0) {
 169                         /* make sure we don't try to shift by 32.
 170                          * See ISO/IEC 9899:TC3 § 6.5.7.3. */
 171                         uint32_t b1, b2;
 172
 173                         if (a1->in_addr_peer.in.s_addr != 0)
 174                                 b1 = be32toh(a1->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 175                         else
 176                                 b1 = be32toh(a1->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 177
 178                         if (a2->in_addr_peer.in.s_addr != 0)
 179                                 b2 = be32toh(a2->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 180                         else
 181                                 b2 = be32toh(a2->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 182
 183                         r = CMP(b1, b2);
 184                         if (r != 0)
 185                                 return r;
 186                 }
 187
 188                 _fallthrough_;
 189         case AF_INET6:
 190                 return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
 191         default:
 192                 /* treat any other address family as AF_UNSPEC */
 193                 return 0;
 194         }
 195 }
 196
 197 static const struct hash_ops address_hash_ops = {
 198         .hash = address_hash_func,
 199         .compare = address_compare_func
 200 };
 201
 202 bool address_equal(Address *a1, Address *a2) {
 203         if (a1 == a2)
 204                 return true;
 205
 206         if (!a1 || !a2)
 207                 return false;
 208
 209         return address_compare_func(a1, a2) == 0;
 210 }
 211
 212 static int address_establish(Address *address, Link *link) {
 213         bool masq;
 214         int r;
 215
 216         assert(address);
 217         assert(link);
 218
 219         masq = link->network &&
 220                link->network->ip_masquerade &&
 221                address->family == AF_INET &&
 222                address->scope < RT_SCOPE_LINK;
 223
 224         /* Add firewall entry if this is requested */
 225         if (address->ip_masquerade_done != masq) {
 226                 union in_addr_union masked = address->in_addr;
 227                 in_addr_mask(address->family, &masked, address->prefixlen);
 228
 229                 r = fw_add_masquerade(masq, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 230                 if (r < 0)
 231                         log_link_warning_errno(link, r, "Could not enable IP masquerading: %m");
 232
 233                 address->ip_masquerade_done = masq;
 234         }
 235
 236         return 0;
 237 }
 238
 239 static int address_add_internal(Link *link, Set **addresses,
 240                                 int family,
 241                                 const union in_addr_union *in_addr,
 242                                 unsigned char prefixlen,
 243                                 Address **ret) {
 244         _cleanup_(address_freep) Address *address = NULL;
 245         int r;
 246
 247         assert(link);
 248         assert(addresses);
 249         assert(in_addr);
 250
 251         r = address_new(&address);
 252         if (r < 0)
 253                 return r;
 254
 255         address->family = family;
 256         address->in_addr = *in_addr;
 257         address->prefixlen = prefixlen;
 258         /* Consider address tentative until we get the real flags from the kernel */
 259         address->flags = IFA_F_TENTATIVE;
 260
 261         r = set_ensure_allocated(addresses, &address_hash_ops);
 262         if (r < 0)
 263                 return r;
 264
 265         r = set_put(*addresses, address);
 266         if (r < 0)
 267                 return r;
 268
 269         address->link = link;
 270
 271         if (ret)
 272                 *ret = address;
 273
 274         address = NULL;
 275
 276         return 0;
 277 }
 278
 279 int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 280         return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret);
 281 }
 282
 283 int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 284         Address *address;
 285         int r;
 286
 287         r = address_get(link, family, in_addr, prefixlen, &address);
 288         if (r == -ENOENT) {
 289                 /* Address does not exist, create a new one */
 290                 r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address);
 291                 if (r < 0)
 292                         return r;
 293         } else if (r == 0) {
 294                 /* Take over a foreign address */
 295                 r = set_ensure_allocated(&link->addresses, &address_hash_ops);
 296                 if (r < 0)
 297                         return r;
 298
 299                 r = set_put(link->addresses, address);
 300                 if (r < 0)
 301                         return r;
 302
 303                 set_remove(link->addresses_foreign, address);
 304         } else if (r == 1) {
 305                 /* Already exists, do nothing */
 306                 ;
 307         } else
 308                 return r;
 309
 310         if (ret)
 311                 *ret = address;
 312
 313         return 0;
 314 }
 315
 316 static int address_release(Address *address) {
 317         int r;
 318
 319         assert(address);
 320         assert(address->link);
 321
 322         /* Remove masquerading firewall entry if it was added */
 323         if (address->ip_masquerade_done) {
 324                 union in_addr_union masked = address->in_addr;
 325                 in_addr_mask(address->family, &masked, address->prefixlen);
 326
 327                 r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 328                 if (r < 0)
 329                         log_link_warning_errno(address->link, r, "Failed to disable IP masquerading: %m");
 330
 331                 address->ip_masquerade_done = false;
 332         }
 333
 334         return 0;
 335 }
 336
 337 int address_update(
 338                 Address *address,
 339                 unsigned char flags,
 340                 unsigned char scope,
 341                 const struct ifa_cacheinfo *cinfo) {
 342
 343         bool ready;
 344         int r;
 345
 346         assert(address);
 347         assert(cinfo);
 348         assert_return(address->link, 1);
 349
 350         if (IN_SET(address->link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 351                 return 1;
 352
 353         ready = address_is_ready(address);
 354
 355         address->flags = flags;
 356         address->scope = scope;
 357         address->cinfo = *cinfo;
 358
 359         link_update_operstate(address->link);
 360
 361         if (!ready && address_is_ready(address)) {
 362                 link_check_ready(address->link);
 363
 364                 if (address->family == AF_INET6 &&
 365                     in_addr_is_link_local(AF_INET6, &address->in_addr) > 0 &&
 366                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &address->link->ipv6ll_address) > 0) {
 367
 368                         r = link_ipv6ll_gained(address->link, &address->in_addr.in6);
 369                         if (r < 0)
 370                                 return r;
 371                 }
 372         }
 373
 374         return 0;
 375 }
 376
 377 int address_drop(Address *address) {
 378         Link *link;
 379         bool ready;
 380
 381         assert(address);
 382
 383         ready = address_is_ready(address);
 384         link = address->link;
 385
 386         address_release(address);
 387         address_free(address);
 388
 389         link_update_operstate(link);
 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 int address_remove(
 432                 Address *address,
 433                 Link *link,
 434                 sd_netlink_message_handler_t callback) {
 435
 436         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 437         _cleanup_free_ char *b = NULL;
 438         int r;
 439
 440         assert(address);
 441         assert(IN_SET(address->family, AF_INET, AF_INET6));
 442         assert(link);
 443         assert(link->ifindex > 0);
 444         assert(link->manager);
 445         assert(link->manager->rtnl);
 446
 447         if (DEBUG_LOGGING) {
 448                 if (in_addr_to_string(address->family, &address->in_addr, &b) >= 0)
 449                         log_link_debug(link, "Removing address %s", b);
 450         }
 451
 452         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 453                                      link->ifindex, address->family);
 454         if (r < 0)
 455                 return log_error_errno(r, "Could not allocate RTM_DELADDR message: %m");
 456
 457         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 458         if (r < 0)
 459                 return log_error_errno(r, "Could not set prefixlen: %m");
 460
 461         if (address->family == AF_INET)
 462                 r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
 463         else if (address->family == AF_INET6)
 464                 r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
 465         if (r < 0)
 466                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 467
 468         r = sd_netlink_call_async(link->manager->rtnl, NULL, req, callback,
 469                                   link_netlink_destroy_callback, link, 0, __func__);
 470         if (r < 0)
 471                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 472
 473         link_ref(link);
 474
 475         return 0;
 476 }
 477
 478 static int address_acquire(Link *link, Address *original, Address **ret) {
 479         union in_addr_union in_addr = {};
 480         struct in_addr broadcast = {};
 481         _cleanup_(address_freep) Address *na = NULL;
 482         int r;
 483
 484         assert(link);
 485         assert(original);
 486         assert(ret);
 487
 488         /* Something useful was configured? just use it */
 489         if (in_addr_is_null(original->family, &original->in_addr) <= 0)
 490                 return 0;
 491
 492         /* The address is configured to be 0.0.0.0 or [::] by the user?
 493          * Then let's acquire something more useful from the pool. */
 494         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 495         if (r < 0)
 496                 return log_link_error_errno(link, r, "Failed to acquire address from pool: %m");
 497         if (r == 0) {
 498                 log_link_error(link, "Couldn't find free address for interface, all taken.");
 499                 return -EBUSY;
 500         }
 501
 502         if (original->family == AF_INET) {
 503                 /* Pick first address in range for ourselves ... */
 504                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 505
 506                 /* .. and use last as broadcast address */
 507                 if (original->prefixlen > 30)
 508                         broadcast.s_addr = 0;
 509                 else
 510                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 511         } else if (original->family == AF_INET6)
 512                 in_addr.in6.s6_addr[15] |= 1;
 513
 514         r = address_new(&na);
 515         if (r < 0)
 516                 return r;
 517
 518         na->family = original->family;
 519         na->prefixlen = original->prefixlen;
 520         na->scope = original->scope;
 521         na->cinfo = original->cinfo;
 522
 523         if (original->label) {
 524                 na->label = strdup(original->label);
 525                 if (!na->label)
 526                         return -ENOMEM;
 527         }
 528
 529         na->broadcast = broadcast;
 530         na->in_addr = in_addr;
 531
 532         LIST_PREPEND(addresses, link->pool_addresses, na);
 533
 534         *ret = TAKE_PTR(na);
 535
 536         return 0;
 537 }
 538
 539 int address_configure(
 540                 Address *address,
 541                 Link *link,
 542                 sd_netlink_message_handler_t callback,
 543                 bool update) {
 544
 545         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 546         int r;
 547
 548         assert(address);
 549         assert(IN_SET(address->family, AF_INET, AF_INET6));
 550         assert(link);
 551         assert(link->ifindex > 0);
 552         assert(link->manager);
 553         assert(link->manager->rtnl);
 554
 555         /* If this is a new address, then refuse adding more than the limit */
 556         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 557             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 558                 return -E2BIG;
 559
 560         r = address_acquire(link, address, &address);
 561         if (r < 0)
 562                 return r;
 563
 564         if (update)
 565                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 566                                                     link->ifindex, address->family);
 567         else
 568                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 569                                              link->ifindex, address->family);
 570         if (r < 0)
 571                 return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
 572
 573         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 574         if (r < 0)
 575                 return log_error_errno(r, "Could not set prefixlen: %m");
 576
 577         address->flags |= IFA_F_PERMANENT;
 578
 579         if (address->home_address)
 580                 address->flags |= IFA_F_HOMEADDRESS;
 581
 582         if (address->duplicate_address_detection)
 583                 address->flags |= IFA_F_NODAD;
 584
 585         if (address->manage_temporary_address)
 586                 address->flags |= IFA_F_MANAGETEMPADDR;
 587
 588         if (address->prefix_route)
 589                 address->flags |= IFA_F_NOPREFIXROUTE;
 590
 591         if (address->autojoin)
 592                 address->flags |= IFA_F_MCAUTOJOIN;
 593
 594         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 595         if (r < 0)
 596                 return log_error_errno(r, "Could not set flags: %m");
 597
 598         if (address->flags & ~0xff) {
 599                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 600                 if (r < 0)
 601                         return log_error_errno(r, "Could not set extended flags: %m");
 602         }
 603
 604         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 605         if (r < 0)
 606                 return log_error_errno(r, "Could not set scope: %m");
 607
 608         if (address->family == AF_INET)
 609                 r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
 610         else if (address->family == AF_INET6)
 611                 r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
 612         if (r < 0)
 613                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 614
 615         if (!in_addr_is_null(address->family, &address->in_addr_peer)) {
 616                 if (address->family == AF_INET)
 617                         r = sd_netlink_message_append_in_addr(req, IFA_ADDRESS, &address->in_addr_peer.in);
 618                 else if (address->family == AF_INET6)
 619                         r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &address->in_addr_peer.in6);
 620                 if (r < 0)
 621                         return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
 622         } else {
 623                 if (address->family == AF_INET) {
 624                         if (address->prefixlen <= 30) {
 625                                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 626                                 if (r < 0)
 627                                         return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
 628                         }
 629                 }
 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,
 639                                               &address->cinfo);
 640         if (r < 0)
 641                 return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
 642
 643         r = address_establish(address, link);
 644         if (r < 0)
 645                 return r;
 646
 647         r = sd_netlink_call_async(link->manager->rtnl, NULL, req, callback,
 648                                   link_netlink_destroy_callback, link, 0, __func__);
 649         if (r < 0) {
 650                 address_release(address);
 651                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 652         }
 653
 654         link_ref(link);
 655
 656         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 657         if (r < 0) {
 658                 address_release(address);
 659                 return log_error_errno(r, "Could not add address: %m");
 660         }
 661
 662         return 0;
 663 }
 664
 665 int config_parse_broadcast(
 666                 const char *unit,
 667                 const char *filename,
 668                 unsigned line,
 669                 const char *section,
 670                 unsigned section_line,
 671                 const char *lvalue,
 672                 int ltype,
 673                 const char *rvalue,
 674                 void *data,
 675                 void *userdata) {
 676
 677         Network *network = userdata;
 678         _cleanup_(address_freep) Address *n = NULL;
 679         int r;
 680
 681         assert(filename);
 682         assert(section);
 683         assert(lvalue);
 684         assert(rvalue);
 685         assert(data);
 686
 687         r = address_new_static(network, filename, section_line, &n);
 688         if (r < 0)
 689                 return r;
 690
 691         if (n->family == AF_INET6) {
 692                 log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 693                 return 0;
 694         }
 695
 696         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 697         if (r < 0) {
 698                 log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue);
 699                 return 0;
 700         }
 701
 702         n->family = AF_INET;
 703         n = NULL;
 704
 705         return 0;
 706 }
 707
 708 int config_parse_address(const char *unit,
 709                 const char *filename,
 710                 unsigned line,
 711                 const char *section,
 712                 unsigned section_line,
 713                 const char *lvalue,
 714                 int ltype,
 715                 const char *rvalue,
 716                 void *data,
 717                 void *userdata) {
 718
 719         Network *network = userdata;
 720         _cleanup_(address_freep) Address *n = NULL;
 721         union in_addr_union buffer;
 722         unsigned char prefixlen;
 723         int r, f;
 724
 725         assert(filename);
 726         assert(section);
 727         assert(lvalue);
 728         assert(rvalue);
 729         assert(data);
 730
 731         if (streq(section, "Network")) {
 732                 /* we are not in an Address section, so treat
 733                  * this as the special '0' section */
 734                 r = address_new_static(network, NULL, 0, &n);
 735         } else
 736                 r = address_new_static(network, filename, section_line, &n);
 737
 738         if (r < 0)
 739                 return r;
 740
 741         /* Address=address/prefixlen */
 742         r = in_addr_default_prefix_from_string_auto(rvalue, &f, &buffer, &prefixlen);
 743         if (r < 0) {
 744                 log_syntax(unit, LOG_ERR, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue);
 745                 return 0;
 746         }
 747
 748         if (n->family != AF_UNSPEC && f != n->family) {
 749                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue);
 750                 return 0;
 751         }
 752
 753         n->family = f;
 754         n->prefixlen = prefixlen;
 755
 756         if (streq(lvalue, "Address"))
 757                 n->in_addr = buffer;
 758         else
 759                 n->in_addr_peer = buffer;
 760
 761         if (n->family == AF_INET && n->broadcast.s_addr == 0)
 762                 n->broadcast.s_addr = n->in_addr.in.s_addr | htonl(0xfffffffflu >> n->prefixlen);
 763
 764         n = NULL;
 765
 766         return 0;
 767 }
 768
 769 int config_parse_label(
 770                 const char *unit,
 771                 const char *filename,
 772                 unsigned line,
 773                 const char *section,
 774                 unsigned section_line,
 775                 const char *lvalue,
 776                 int ltype,
 777                 const char *rvalue,
 778                 void *data,
 779                 void *userdata) {
 780
 781         _cleanup_(address_freep) Address *n = NULL;
 782         Network *network = userdata;
 783         int r;
 784
 785         assert(filename);
 786         assert(section);
 787         assert(lvalue);
 788         assert(rvalue);
 789         assert(data);
 790
 791         r = address_new_static(network, filename, section_line, &n);
 792         if (r < 0)
 793                 return r;
 794
 795         if (!address_label_valid(rvalue)) {
 796                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 797                 return 0;
 798         }
 799
 800         r = free_and_strdup(&n->label, rvalue);
 801         if (r < 0)
 802                 return log_oom();
 803
 804         n = NULL;
 805
 806         return 0;
 807 }
 808
 809 int config_parse_lifetime(const char *unit,
 810                           const char *filename,
 811                           unsigned line,
 812                           const char *section,
 813                           unsigned section_line,
 814                           const char *lvalue,
 815                           int ltype,
 816                           const char *rvalue,
 817                           void *data,
 818                           void *userdata) {
 819         Network *network = userdata;
 820         _cleanup_(address_freep) Address *n = NULL;
 821         unsigned k;
 822         int r;
 823
 824         assert(filename);
 825         assert(section);
 826         assert(lvalue);
 827         assert(rvalue);
 828         assert(data);
 829
 830         r = address_new_static(network, filename, section_line, &n);
 831         if (r < 0)
 832                 return r;
 833
 834         if (STR_IN_SET(rvalue, "forever", "infinity")) {
 835                 n->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
 836                 n = NULL;
 837
 838                 return 0;
 839         }
 840
 841         r = safe_atou(rvalue, &k);
 842         if (r < 0) {
 843                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse PreferredLifetime, ignoring: %s", rvalue);
 844                 return 0;
 845         }
 846
 847         if (k != 0)
 848                 log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid PreferredLifetime value, ignoring: %d", k);
 849         else {
 850                 n->cinfo.ifa_prefered = k;
 851                 n = NULL;
 852         }
 853
 854         return 0;
 855 }
 856
 857 int config_parse_address_flags(const char *unit,
 858                                const char *filename,
 859                                unsigned line,
 860                                const char *section,
 861                                unsigned section_line,
 862                                const char *lvalue,
 863                                int ltype,
 864                                const char *rvalue,
 865                                void *data,
 866                                void *userdata) {
 867         Network *network = userdata;
 868         _cleanup_(address_freep) Address *n = NULL;
 869         int r;
 870
 871         assert(filename);
 872         assert(section);
 873         assert(lvalue);
 874         assert(rvalue);
 875         assert(data);
 876
 877         r = address_new_static(network, filename, section_line, &n);
 878         if (r < 0)
 879                 return r;
 880
 881         r = parse_boolean(rvalue);
 882         if (r < 0) {
 883                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 884                 return 0;
 885         }
 886
 887         if (streq(lvalue, "HomeAddress"))
 888                 n->home_address = r;
 889         else if (streq(lvalue, "DuplicateAddressDetection"))
 890                 n->duplicate_address_detection = r;
 891         else if (streq(lvalue, "ManageTemporaryAddress"))
 892                 n->manage_temporary_address = r;
 893         else if (streq(lvalue, "PrefixRoute"))
 894                 n->prefix_route = r;
 895         else if (streq(lvalue, "AutoJoin"))
 896                 n->autojoin = r;
 897
 898         return 0;
 899 }
 900
 901 int config_parse_address_scope(const char *unit,
 902                                const char *filename,
 903                                unsigned line,
 904                                const char *section,
 905                                unsigned section_line,
 906                                const char *lvalue,
 907                                int ltype,
 908                                const char *rvalue,
 909                                void *data,
 910                                void *userdata) {
 911         Network *network = userdata;
 912         _cleanup_(address_freep) Address *n = NULL;
 913         int r;
 914
 915         assert(filename);
 916         assert(section);
 917         assert(lvalue);
 918         assert(rvalue);
 919         assert(data);
 920
 921         r = address_new_static(network, filename, section_line, &n);
 922         if (r < 0)
 923                 return r;
 924
 925         if (streq(rvalue, "host"))
 926                 n->scope = RT_SCOPE_HOST;
 927         else if (streq(rvalue, "link"))
 928                 n->scope = RT_SCOPE_LINK;
 929         else if (streq(rvalue, "global"))
 930                 n->scope = RT_SCOPE_UNIVERSE;
 931         else {
 932                 r = safe_atou8(rvalue , &n->scope);
 933                 if (r < 0) {
 934                         log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
 935                         return 0;
 936                 }
 937         }
 938
 939         n = NULL;
 940
 941         return 0;
 942 }
 943
 944 bool address_is_ready(const Address *a) {
 945         assert(a);
 946
 947         if (a->family == AF_INET6)
 948                 return !(a->flags & IFA_F_TENTATIVE);
 949         else
 950                 return !(a->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED));
 951 }