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 "utf8.h"
  16 #include "util.h"
  17
  18 #define ADDRESSES_PER_LINK_MAX 2048U
  19 #define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
  20
  21 int address_new(Address **ret) {
  22         _cleanup_(address_freep) Address *address = NULL;
  23
  24         address = new0(Address, 1);
  25         if (!address)
  26                 return -ENOMEM;
  27
  28         address->family = AF_UNSPEC;
  29         address->scope = RT_SCOPE_UNIVERSE;
  30         address->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
  31         address->cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME;
  32
  33         *ret = TAKE_PTR(address);
  34
  35         return 0;
  36 }
  37
  38 int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) {
  39         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  40         _cleanup_(address_freep) Address *address = NULL;
  41         int r;
  42
  43         assert(network);
  44         assert(ret);
  45         assert(!!filename == (section_line > 0));
  46
  47         if (filename) {
  48                 r = network_config_section_new(filename, section_line, &n);
  49                 if (r < 0)
  50                         return r;
  51
  52                 address = hashmap_get(network->addresses_by_section, n);
  53                 if (address) {
  54                         *ret = TAKE_PTR(address);
  55
  56                         return 0;
  57                 }
  58         }
  59
  60         if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX)
  61                 return -E2BIG;
  62
  63         r = address_new(&address);
  64         if (r < 0)
  65                 return r;
  66
  67         if (filename) {
  68                 address->section = TAKE_PTR(n);
  69
  70                 r = hashmap_put(network->addresses_by_section, address->section, address);
  71                 if (r < 0)
  72                         return r;
  73         }
  74
  75         address->network = network;
  76         LIST_APPEND(addresses, network->static_addresses, address);
  77         network->n_static_addresses++;
  78
  79         *ret = TAKE_PTR(address);
  80
  81         return 0;
  82 }
  83
  84 void address_free(Address *address) {
  85         if (!address)
  86                 return;
  87
  88         if (address->network) {
  89                 LIST_REMOVE(addresses, address->network->static_addresses, address);
  90                 assert(address->network->n_static_addresses > 0);
  91                 address->network->n_static_addresses--;
  92
  93                 if (address->section) {
  94                         hashmap_remove(address->network->addresses_by_section, address->section);
  95                         network_config_section_free(address->section);
  96                 }
  97         }
  98
  99         if (address->link) {
 100                 set_remove(address->link->addresses, address);
 101                 set_remove(address->link->addresses_foreign, address);
 102
 103                 if (in_addr_equal(AF_INET6, &address->in_addr, (const union in_addr_union *) &address->link->ipv6ll_address))
 104                         memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr));
 105         }
 106
 107         free(address);
 108 }
 109
 110 static void address_hash_func(const void *b, struct siphash *state) {
 111         const Address *a = b;
 112
 113         assert(a);
 114
 115         siphash24_compress(&a->family, sizeof(a->family), state);
 116
 117         switch (a->family) {
 118         case AF_INET:
 119                 siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
 120
 121                 /* peer prefix */
 122                 if (a->prefixlen != 0) {
 123                         uint32_t prefix;
 124
 125                         if (a->in_addr_peer.in.s_addr != 0)
 126                                 prefix = be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen);
 127                         else
 128                                 prefix = be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen);
 129
 130                         siphash24_compress(&prefix, sizeof(prefix), state);
 131                 }
 132
 133                 _fallthrough_;
 134         case AF_INET6:
 135                 /* local address */
 136                 siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
 137
 138                 break;
 139         default:
 140                 /* treat any other address family as AF_UNSPEC */
 141                 break;
 142         }
 143 }
 144
 145 static int address_compare_func(const void *c1, const void *c2) {
 146         const Address *a1 = c1, *a2 = c2;
 147
 148         if (a1->family < a2->family)
 149                 return -1;
 150         if (a1->family > a2->family)
 151                 return 1;
 152
 153         switch (a1->family) {
 154         /* use the same notion of equality as the kernel does */
 155         case AF_INET:
 156                 if (a1->prefixlen < a2->prefixlen)
 157                         return -1;
 158                 if (a1->prefixlen > a2->prefixlen)
 159                         return 1;
 160
 161                 /* compare the peer prefixes */
 162                 if (a1->prefixlen != 0) {
 163                         /* make sure we don't try to shift by 32.
 164                          * See ISO/IEC 9899:TC3 § 6.5.7.3. */
 165                         uint32_t b1, b2;
 166
 167                         if (a1->in_addr_peer.in.s_addr != 0)
 168                                 b1 = be32toh(a1->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 169                         else
 170                                 b1 = be32toh(a1->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 171
 172                         if (a2->in_addr_peer.in.s_addr != 0)
 173                                 b2 = be32toh(a2->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 174                         else
 175                                 b2 = be32toh(a2->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 176
 177                         if (b1 < b2)
 178                                 return -1;
 179                         if (b1 > b2)
 180                                 return 1;
 181                 }
 182
 183                 _fallthrough_;
 184         case AF_INET6:
 185                 return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
 186         default:
 187                 /* treat any other address family as AF_UNSPEC */
 188                 return 0;
 189         }
 190 }
 191
 192 static const struct hash_ops address_hash_ops = {
 193         .hash = address_hash_func,
 194         .compare = address_compare_func
 195 };
 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);
 355
 356         if (!ready && address_is_ready(address)) {
 357                 link_check_ready(address->link);
 358
 359                 if (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
 369         return 0;
 370 }
 371
 372 int address_drop(Address *address) {
 373         Link *link;
 374         bool ready;
 375
 376         assert(address);
 377
 378         ready = address_is_ready(address);
 379         link = address->link;
 380
 381         address_release(address);
 382         address_free(address);
 383
 384         link_update_operstate(link);
 385
 386         if (link && !ready)
 387                 link_check_ready(link);
 388
 389         return 0;
 390 }
 391
 392 int address_get(Link *link,
 393                 int family,
 394                 const union in_addr_union *in_addr,
 395                 unsigned char prefixlen,
 396                 Address **ret) {
 397
 398         Address address, *existing;
 399
 400         assert(link);
 401         assert(in_addr);
 402
 403         address = (Address) {
 404                 .family = family,
 405                 .in_addr = *in_addr,
 406                 .prefixlen = prefixlen,
 407         };
 408
 409         existing = set_get(link->addresses, &address);
 410         if (existing) {
 411                 if (ret)
 412                         *ret = existing;
 413                 return 1;
 414         }
 415
 416         existing = set_get(link->addresses_foreign, &address);
 417         if (existing) {
 418                 if (ret)
 419                         *ret = existing;
 420                 return 0;
 421         }
 422
 423         return -ENOENT;
 424 }
 425
 426 int address_remove(
 427                 Address *address,
 428                 Link *link,
 429                 sd_netlink_message_handler_t callback) {
 430
 431         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 432         int r;
 433
 434         assert(address);
 435         assert(IN_SET(address->family, AF_INET, AF_INET6));
 436         assert(link);
 437         assert(link->ifindex > 0);
 438         assert(link->manager);
 439         assert(link->manager->rtnl);
 440
 441         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 442                                      link->ifindex, address->family);
 443         if (r < 0)
 444                 return log_error_errno(r, "Could not allocate RTM_DELADDR message: %m");
 445
 446         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 447         if (r < 0)
 448                 return log_error_errno(r, "Could not set prefixlen: %m");
 449
 450         if (address->family == AF_INET)
 451                 r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
 452         else if (address->family == AF_INET6)
 453                 r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
 454         if (r < 0)
 455                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 456
 457         r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
 458         if (r < 0)
 459                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 460
 461         link_ref(link);
 462
 463         return 0;
 464 }
 465
 466 static int address_acquire(Link *link, Address *original, Address **ret) {
 467         union in_addr_union in_addr = {};
 468         struct in_addr broadcast = {};
 469         _cleanup_(address_freep) Address *na = NULL;
 470         int r;
 471
 472         assert(link);
 473         assert(original);
 474         assert(ret);
 475
 476         /* Something useful was configured? just use it */
 477         if (in_addr_is_null(original->family, &original->in_addr) <= 0)
 478                 return 0;
 479
 480         /* The address is configured to be 0.0.0.0 or [::] by the user?
 481          * Then let's acquire something more useful from the pool. */
 482         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 483         if (r < 0)
 484                 return log_link_error_errno(link, r, "Failed to acquire address from pool: %m");
 485         if (r == 0) {
 486                 log_link_error(link, "Couldn't find free address for interface, all taken.");
 487                 return -EBUSY;
 488         }
 489
 490         if (original->family == AF_INET) {
 491                 /* Pick first address in range for ourselves ... */
 492                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 493
 494                 /* .. and use last as broadcast address */
 495                 if (original->prefixlen > 30)
 496                         broadcast.s_addr = 0;
 497                 else
 498                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 499         } else if (original->family == AF_INET6)
 500                 in_addr.in6.s6_addr[15] |= 1;
 501
 502         r = address_new(&na);
 503         if (r < 0)
 504                 return r;
 505
 506         na->family = original->family;
 507         na->prefixlen = original->prefixlen;
 508         na->scope = original->scope;
 509         na->cinfo = original->cinfo;
 510
 511         if (original->label) {
 512                 na->label = strdup(original->label);
 513                 if (!na->label)
 514                         return -ENOMEM;
 515         }
 516
 517         na->broadcast = broadcast;
 518         na->in_addr = in_addr;
 519
 520         LIST_PREPEND(addresses, link->pool_addresses, na);
 521
 522         *ret = TAKE_PTR(na);
 523
 524         return 0;
 525 }
 526
 527 int address_configure(
 528                 Address *address,
 529                 Link *link,
 530                 sd_netlink_message_handler_t callback,
 531                 bool update) {
 532
 533         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 534         int r;
 535
 536         assert(address);
 537         assert(IN_SET(address->family, AF_INET, AF_INET6));
 538         assert(link);
 539         assert(link->ifindex > 0);
 540         assert(link->manager);
 541         assert(link->manager->rtnl);
 542
 543         /* If this is a new address, then refuse adding more than the limit */
 544         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 545             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 546                 return -E2BIG;
 547
 548         r = address_acquire(link, address, &address);
 549         if (r < 0)
 550                 return r;
 551
 552         if (update)
 553                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 554                                                     link->ifindex, address->family);
 555         else
 556                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 557                                              link->ifindex, address->family);
 558         if (r < 0)
 559                 return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
 560
 561         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 562         if (r < 0)
 563                 return log_error_errno(r, "Could not set prefixlen: %m");
 564
 565         address->flags |= IFA_F_PERMANENT;
 566
 567         if (address->home_address)
 568                 address->flags |= IFA_F_HOMEADDRESS;
 569
 570         if (address->duplicate_address_detection)
 571                 address->flags |= IFA_F_NODAD;
 572
 573         if (address->manage_temporary_address)
 574                 address->flags |= IFA_F_MANAGETEMPADDR;
 575
 576         if (address->prefix_route)
 577                 address->flags |= IFA_F_NOPREFIXROUTE;
 578
 579         if (address->autojoin)
 580                 address->flags |= IFA_F_MCAUTOJOIN;
 581
 582         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 583         if (r < 0)
 584                 return log_error_errno(r, "Could not set flags: %m");
 585
 586         if (address->flags & ~0xff) {
 587                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 588                 if (r < 0)
 589                         return log_error_errno(r, "Could not set extended flags: %m");
 590         }
 591
 592         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 593         if (r < 0)
 594                 return log_error_errno(r, "Could not set scope: %m");
 595
 596         if (address->family == AF_INET)
 597                 r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
 598         else if (address->family == AF_INET6)
 599                 r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
 600         if (r < 0)
 601                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 602
 603         if (!in_addr_is_null(address->family, &address->in_addr_peer)) {
 604                 if (address->family == AF_INET)
 605                         r = sd_netlink_message_append_in_addr(req, IFA_ADDRESS, &address->in_addr_peer.in);
 606                 else if (address->family == AF_INET6)
 607                         r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &address->in_addr_peer.in6);
 608                 if (r < 0)
 609                         return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
 610         } else {
 611                 if (address->family == AF_INET) {
 612                         if (address->prefixlen <= 30) {
 613                                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 614                                 if (r < 0)
 615                                         return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
 616                         }
 617                 }
 618         }
 619
 620         if (address->label) {
 621                 r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
 622                 if (r < 0)
 623                         return log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
 624         }
 625
 626         r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO,
 627                                               &address->cinfo);
 628         if (r < 0)
 629                 return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
 630
 631         r = address_establish(address, link);
 632         if (r < 0)
 633                 return r;
 634
 635         r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
 636         if (r < 0) {
 637                 address_release(address);
 638                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 639         }
 640
 641         link_ref(link);
 642
 643         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 644         if (r < 0) {
 645                 address_release(address);
 646                 return log_error_errno(r, "Could not add address: %m");
 647         }
 648
 649         return 0;
 650 }
 651
 652 int config_parse_broadcast(
 653                 const char *unit,
 654                 const char *filename,
 655                 unsigned line,
 656                 const char *section,
 657                 unsigned section_line,
 658                 const char *lvalue,
 659                 int ltype,
 660                 const char *rvalue,
 661                 void *data,
 662                 void *userdata) {
 663
 664         Network *network = userdata;
 665         _cleanup_(address_freep) Address *n = NULL;
 666         int r;
 667
 668         assert(filename);
 669         assert(section);
 670         assert(lvalue);
 671         assert(rvalue);
 672         assert(data);
 673
 674         r = address_new_static(network, filename, section_line, &n);
 675         if (r < 0)
 676                 return r;
 677
 678         if (n->family == AF_INET6) {
 679                 log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 680                 return 0;
 681         }
 682
 683         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 684         if (r < 0) {
 685                 log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue);
 686                 return 0;
 687         }
 688
 689         n->family = AF_INET;
 690         n = NULL;
 691
 692         return 0;
 693 }
 694
 695 int config_parse_address(const char *unit,
 696                 const char *filename,
 697                 unsigned line,
 698                 const char *section,
 699                 unsigned section_line,
 700                 const char *lvalue,
 701                 int ltype,
 702                 const char *rvalue,
 703                 void *data,
 704                 void *userdata) {
 705
 706         Network *network = userdata;
 707         _cleanup_(address_freep) Address *n = NULL;
 708         const char *address, *e;
 709         union in_addr_union buffer;
 710         int r, f;
 711
 712         assert(filename);
 713         assert(section);
 714         assert(lvalue);
 715         assert(rvalue);
 716         assert(data);
 717
 718         if (streq(section, "Network")) {
 719                 /* we are not in an Address section, so treat
 720                  * this as the special '0' section */
 721                 r = address_new_static(network, NULL, 0, &n);
 722         } else
 723                 r = address_new_static(network, filename, section_line, &n);
 724
 725         if (r < 0)
 726                 return r;
 727
 728         /* Address=address/prefixlen */
 729
 730         /* prefixlen */
 731         e = strchr(rvalue, '/');
 732         if (e) {
 733                 unsigned i;
 734
 735                 r = safe_atou(e + 1, &i);
 736                 if (r < 0) {
 737                         log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1);
 738                         return 0;
 739                 }
 740
 741                 n->prefixlen = (unsigned char) i;
 742
 743                 address = strndupa(rvalue, e - rvalue);
 744         } else
 745                 address = rvalue;
 746
 747         r = in_addr_from_string_auto(address, &f, &buffer);
 748         if (r < 0) {
 749                 log_syntax(unit, LOG_ERR, filename, line, r, "Address is invalid, ignoring assignment: %s", address);
 750                 return 0;
 751         }
 752
 753         if (!e && f == AF_INET) {
 754                 r = in4_addr_default_prefixlen(&buffer.in, &n->prefixlen);
 755                 if (r < 0) {
 756                         log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length not specified, and a default one cannot be deduced for '%s', ignoring assignment", address);
 757                         return 0;
 758                 }
 759         }
 760
 761         if (n->family != AF_UNSPEC && f != n->family) {
 762                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", address);
 763                 return 0;
 764         }
 765
 766         n->family = f;
 767
 768         if (streq(lvalue, "Address"))
 769                 n->in_addr = buffer;
 770         else
 771                 n->in_addr_peer = buffer;
 772
 773         if (n->family == AF_INET && n->broadcast.s_addr == 0)
 774                 n->broadcast.s_addr = n->in_addr.in.s_addr | htonl(0xfffffffflu >> n->prefixlen);
 775
 776         n = NULL;
 777
 778         return 0;
 779 }
 780
 781 int config_parse_label(
 782                 const char *unit,
 783                 const char *filename,
 784                 unsigned line,
 785                 const char *section,
 786                 unsigned section_line,
 787                 const char *lvalue,
 788                 int ltype,
 789                 const char *rvalue,
 790                 void *data,
 791                 void *userdata) {
 792
 793         _cleanup_(address_freep) Address *n = NULL;
 794         Network *network = userdata;
 795         int r;
 796
 797         assert(filename);
 798         assert(section);
 799         assert(lvalue);
 800         assert(rvalue);
 801         assert(data);
 802
 803         r = address_new_static(network, filename, section_line, &n);
 804         if (r < 0)
 805                 return r;
 806
 807         if (!address_label_valid(rvalue)) {
 808                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 809                 return 0;
 810         }
 811
 812         r = free_and_strdup(&n->label, rvalue);
 813         if (r < 0)
 814                 return log_oom();
 815
 816         n = NULL;
 817
 818         return 0;
 819 }
 820
 821 int config_parse_lifetime(const char *unit,
 822                           const char *filename,
 823                           unsigned line,
 824                           const char *section,
 825                           unsigned section_line,
 826                           const char *lvalue,
 827                           int ltype,
 828                           const char *rvalue,
 829                           void *data,
 830                           void *userdata) {
 831         Network *network = userdata;
 832         _cleanup_(address_freep) Address *n = NULL;
 833         unsigned k;
 834         int r;
 835
 836         assert(filename);
 837         assert(section);
 838         assert(lvalue);
 839         assert(rvalue);
 840         assert(data);
 841
 842         r = address_new_static(network, filename, section_line, &n);
 843         if (r < 0)
 844                 return r;
 845
 846         if (STR_IN_SET(rvalue, "forever", "infinity")) {
 847                 n->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
 848                 n = NULL;
 849
 850                 return 0;
 851         }
 852
 853         r = safe_atou(rvalue, &k);
 854         if (r < 0) {
 855                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse PreferredLifetime, ignoring: %s", rvalue);
 856                 return 0;
 857         }
 858
 859         if (k != 0)
 860                 log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid PreferredLifetime value, ignoring: %d", k);
 861         else {
 862                 n->cinfo.ifa_prefered = k;
 863                 n = NULL;
 864         }
 865
 866         return 0;
 867 }
 868
 869 int config_parse_address_flags(const char *unit,
 870                                const char *filename,
 871                                unsigned line,
 872                                const char *section,
 873                                unsigned section_line,
 874                                const char *lvalue,
 875                                int ltype,
 876                                const char *rvalue,
 877                                void *data,
 878                                void *userdata) {
 879         Network *network = userdata;
 880         _cleanup_(address_freep) Address *n = NULL;
 881         int r;
 882
 883         assert(filename);
 884         assert(section);
 885         assert(lvalue);
 886         assert(rvalue);
 887         assert(data);
 888
 889         r = address_new_static(network, filename, section_line, &n);
 890         if (r < 0)
 891                 return r;
 892
 893         r = parse_boolean(rvalue);
 894         if (r < 0) {
 895                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 896                 return 0;
 897         }
 898
 899         if (streq(lvalue, "HomeAddress"))
 900                 n->home_address = r;
 901         else if (streq(lvalue, "DuplicateAddressDetection"))
 902                 n->duplicate_address_detection = r;
 903         else if (streq(lvalue, "ManageTemporaryAddress"))
 904                 n->manage_temporary_address = r;
 905         else if (streq(lvalue, "PrefixRoute"))
 906                 n->prefix_route = r;
 907         else if (streq(lvalue, "AutoJoin"))
 908                 n->autojoin = r;
 909
 910         return 0;
 911 }
 912
 913 int config_parse_address_scope(const char *unit,
 914                                const char *filename,
 915                                unsigned line,
 916                                const char *section,
 917                                unsigned section_line,
 918                                const char *lvalue,
 919                                int ltype,
 920                                const char *rvalue,
 921                                void *data,
 922                                void *userdata) {
 923         Network *network = userdata;
 924         _cleanup_(address_freep) Address *n = NULL;
 925         int r;
 926
 927         assert(filename);
 928         assert(section);
 929         assert(lvalue);
 930         assert(rvalue);
 931         assert(data);
 932
 933         r = address_new_static(network, filename, section_line, &n);
 934         if (r < 0)
 935                 return r;
 936
 937         if (streq(rvalue, "host"))
 938                 n->scope = RT_SCOPE_HOST;
 939         else if (streq(rvalue, "link"))
 940                 n->scope = RT_SCOPE_LINK;
 941         else if (streq(rvalue, "global"))
 942                 n->scope = RT_SCOPE_UNIVERSE;
 943         else {
 944                 r = safe_atou8(rvalue , &n->scope);
 945                 if (r < 0) {
 946                         log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
 947                         return 0;
 948                 }
 949         }
 950
 951         n = NULL;
 952
 953         return 0;
 954 }
 955
 956 bool address_is_ready(const Address *a) {
 957         assert(a);
 958
 959         if (a->family == AF_INET6)
 960                 return !(a->flags & IFA_F_TENTATIVE);
 961         else
 962                 return !(a->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED));
 963 }