src/network/networkd-address.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <net/if.h>
   4
   5 #include "alloc-util.h"
   6 #include "conf-parser.h"
   7 #include "firewall-util.h"
   8 #include "memory-util.h"
   9 #include "missing_network.h"
  10 #include "netlink-util.h"
  11 #include "networkd-address.h"
  12 #include "networkd-manager.h"
  13 #include "parse-util.h"
  14 #include "set.h"
  15 #include "socket-util.h"
  16 #include "string-util.h"
  17 #include "strv.h"
  18 #include "utf8.h"
  19
  20 #define ADDRESSES_PER_LINK_MAX 2048U
  21 #define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
  22
  23 int generate_ipv6_eui_64_address(Link *link, struct in6_addr *ret) {
  24         assert(link);
  25         assert(ret);
  26
  27         /* see RFC4291 section 2.5.1 */
  28         ret->s6_addr[8]  = link->mac.ether_addr_octet[0];
  29         ret->s6_addr[8] ^= 1 << 1;
  30         ret->s6_addr[9]  = link->mac.ether_addr_octet[1];
  31         ret->s6_addr[10] = link->mac.ether_addr_octet[2];
  32         ret->s6_addr[11] = 0xff;
  33         ret->s6_addr[12] = 0xfe;
  34         ret->s6_addr[13] = link->mac.ether_addr_octet[3];
  35         ret->s6_addr[14] = link->mac.ether_addr_octet[4];
  36         ret->s6_addr[15] = link->mac.ether_addr_octet[5];
  37
  38         return 0;
  39 }
  40
  41 int address_new(Address **ret) {
  42         _cleanup_(address_freep) Address *address = NULL;
  43
  44         address = new(Address, 1);
  45         if (!address)
  46                 return -ENOMEM;
  47
  48         *address = (Address) {
  49                 .family = AF_UNSPEC,
  50                 .scope = RT_SCOPE_UNIVERSE,
  51                 .cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME,
  52                 .cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME,
  53                 .duplicate_address_detection = ADDRESS_FAMILY_IPV6,
  54                 .prefix_route = true,
  55         };
  56
  57         *ret = TAKE_PTR(address);
  58
  59         return 0;
  60 }
  61
  62 static int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) {
  63         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  64         _cleanup_(address_freep) Address *address = NULL;
  65         int r;
  66
  67         assert(network);
  68         assert(ret);
  69         assert(!!filename == (section_line > 0));
  70
  71         if (filename) {
  72                 r = network_config_section_new(filename, section_line, &n);
  73                 if (r < 0)
  74                         return r;
  75
  76                 address = hashmap_get(network->addresses_by_section, n);
  77                 if (address) {
  78                         *ret = TAKE_PTR(address);
  79
  80                         return 0;
  81                 }
  82         }
  83
  84         if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX)
  85                 return -E2BIG;
  86
  87         r = address_new(&address);
  88         if (r < 0)
  89                 return r;
  90
  91         address->network = network;
  92         LIST_APPEND(addresses, network->static_addresses, address);
  93         network->n_static_addresses++;
  94
  95         if (filename) {
  96                 address->section = TAKE_PTR(n);
  97
  98                 r = hashmap_ensure_allocated(&network->addresses_by_section, &network_config_hash_ops);
  99                 if (r < 0)
 100                         return r;
 101
 102                 r = hashmap_put(network->addresses_by_section, address->section, address);
 103                 if (r < 0)
 104                         return r;
 105         }
 106
 107         *ret = TAKE_PTR(address);
 108
 109         return 0;
 110 }
 111
 112 void address_free(Address *address) {
 113         if (!address)
 114                 return;
 115
 116         if (address->network) {
 117                 LIST_REMOVE(addresses, address->network->static_addresses, address);
 118                 assert(address->network->n_static_addresses > 0);
 119                 address->network->n_static_addresses--;
 120
 121                 if (address->section)
 122                         hashmap_remove(address->network->addresses_by_section, address->section);
 123         }
 124
 125         if (address->link && !address->acd) {
 126                 set_remove(address->link->addresses, address);
 127                 set_remove(address->link->addresses_foreign, address);
 128
 129                 if (in_addr_equal(AF_INET6, &address->in_addr, (const union in_addr_union *) &address->link->ipv6ll_address))
 130                         memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr));
 131         }
 132
 133         sd_ipv4acd_unref(address->acd);
 134
 135         network_config_section_free(address->section);
 136         free(address->label);
 137         free(address);
 138 }
 139
 140 static uint32_t address_prefix(const Address *a) {
 141         assert(a);
 142
 143         /* make sure we don't try to shift by 32.
 144          * See ISO/IEC 9899:TC3 § 6.5.7.3. */
 145         if (a->prefixlen == 0)
 146                 return 0;
 147
 148         if (a->in_addr_peer.in.s_addr != 0)
 149                 return be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen);
 150         else
 151                 return be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen);
 152 }
 153
 154 static void address_hash_func(const Address *a, struct siphash *state) {
 155         assert(a);
 156
 157         siphash24_compress(&a->family, sizeof(a->family), state);
 158
 159         switch (a->family) {
 160         case AF_INET:
 161                 siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
 162
 163                 /* peer prefix */
 164                 uint32_t prefix = address_prefix(a);
 165                 siphash24_compress(&prefix, sizeof(prefix), state);
 166
 167                 _fallthrough_;
 168         case AF_INET6:
 169                 /* local address */
 170                 siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
 171
 172                 break;
 173         default:
 174                 /* treat any other address family as AF_UNSPEC */
 175                 break;
 176         }
 177 }
 178
 179 static int address_compare_func(const Address *a1, const Address *a2) {
 180         int r;
 181
 182         r = CMP(a1->family, a2->family);
 183         if (r != 0)
 184                 return r;
 185
 186         switch (a1->family) {
 187         /* use the same notion of equality as the kernel does */
 188         case AF_INET:
 189                 r = CMP(a1->prefixlen, a2->prefixlen);
 190                 if (r != 0)
 191                         return r;
 192
 193                 uint32_t prefix1 = address_prefix(a1);
 194                 uint32_t prefix2 = address_prefix(a2);
 195                 r = CMP(prefix1, prefix2);
 196                 if (r != 0)
 197                         return r;
 198
 199                 _fallthrough_;
 200         case AF_INET6:
 201                 return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
 202         default:
 203                 /* treat any other address family as AF_UNSPEC */
 204                 return 0;
 205         }
 206 }
 207
 208 DEFINE_HASH_OPS(address_hash_ops, Address, address_hash_func, address_compare_func);
 209
 210 bool address_equal(Address *a1, Address *a2) {
 211         if (a1 == a2)
 212                 return true;
 213
 214         if (!a1 || !a2)
 215                 return false;
 216
 217         return address_compare_func(a1, a2) == 0;
 218 }
 219
 220 static int address_establish(Address *address, Link *link) {
 221         bool masq;
 222         int r;
 223
 224         assert(address);
 225         assert(link);
 226
 227         masq = link->network &&
 228                link->network->ip_masquerade &&
 229                address->family == AF_INET &&
 230                address->scope < RT_SCOPE_LINK;
 231
 232         /* Add firewall entry if this is requested */
 233         if (address->ip_masquerade_done != masq) {
 234                 union in_addr_union masked = address->in_addr;
 235                 in_addr_mask(address->family, &masked, address->prefixlen);
 236
 237                 r = fw_add_masquerade(masq, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 238                 if (r < 0)
 239                         return r;
 240
 241                 address->ip_masquerade_done = masq;
 242         }
 243
 244         return 0;
 245 }
 246
 247 static int address_add_internal(Link *link, Set **addresses,
 248                                 int family,
 249                                 const union in_addr_union *in_addr,
 250                                 unsigned char prefixlen,
 251                                 Address **ret) {
 252         _cleanup_(address_freep) Address *address = NULL;
 253         int r;
 254
 255         assert(link);
 256         assert(addresses);
 257         assert(in_addr);
 258
 259         r = address_new(&address);
 260         if (r < 0)
 261                 return r;
 262
 263         address->family = family;
 264         address->in_addr = *in_addr;
 265         address->prefixlen = prefixlen;
 266         /* Consider address tentative until we get the real flags from the kernel */
 267         address->flags = IFA_F_TENTATIVE;
 268
 269         r = set_ensure_allocated(addresses, &address_hash_ops);
 270         if (r < 0)
 271                 return r;
 272
 273         r = set_put(*addresses, address);
 274         if (r < 0)
 275                 return r;
 276         if (r == 0)
 277                 return -EEXIST;
 278
 279         address->link = link;
 280
 281         if (ret)
 282                 *ret = address;
 283
 284         address = NULL;
 285
 286         return 0;
 287 }
 288
 289 int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 290         return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret);
 291 }
 292
 293 int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 294         Address *address;
 295         int r;
 296
 297         r = address_get(link, family, in_addr, prefixlen, &address);
 298         if (r == -ENOENT) {
 299                 /* Address does not exist, create a new one */
 300                 r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address);
 301                 if (r < 0)
 302                         return r;
 303         } else if (r == 0) {
 304                 /* Take over a foreign address */
 305                 r = set_ensure_allocated(&link->addresses, &address_hash_ops);
 306                 if (r < 0)
 307                         return r;
 308
 309                 r = set_put(link->addresses, address);
 310                 if (r < 0)
 311                         return r;
 312
 313                 set_remove(link->addresses_foreign, address);
 314         } else if (r == 1) {
 315                 /* Already exists, do nothing */
 316                 ;
 317         } else
 318                 return r;
 319
 320         if (ret)
 321                 *ret = address;
 322
 323         return 0;
 324 }
 325
 326 static int address_release(Address *address) {
 327         int r;
 328
 329         assert(address);
 330         assert(address->link);
 331
 332         /* Remove masquerading firewall entry if it was added */
 333         if (address->ip_masquerade_done) {
 334                 union in_addr_union masked = address->in_addr;
 335                 in_addr_mask(address->family, &masked, address->prefixlen);
 336
 337                 r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 338                 if (r < 0)
 339                         return r;
 340
 341                 address->ip_masquerade_done = false;
 342         }
 343
 344         return 0;
 345 }
 346
 347 int address_update(
 348                 Address *address,
 349                 unsigned char flags,
 350                 unsigned char scope,
 351                 const struct ifa_cacheinfo *cinfo) {
 352
 353         bool ready;
 354         int r;
 355
 356         assert(address);
 357         assert(cinfo);
 358         assert_return(address->link, 1);
 359
 360         if (IN_SET(address->link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 361                 return 1;
 362
 363         ready = address_is_ready(address);
 364
 365         address->flags = flags;
 366         address->scope = scope;
 367         address->cinfo = *cinfo;
 368
 369         link_update_operstate(address->link, true);
 370         link_check_ready(address->link);
 371
 372         if (!ready &&
 373             address_is_ready(address) &&
 374             address->family == AF_INET6 &&
 375             in_addr_is_link_local(AF_INET6, &address->in_addr) > 0 &&
 376             in_addr_is_null(AF_INET6, (const union in_addr_union*) &address->link->ipv6ll_address) > 0) {
 377
 378                 r = link_ipv6ll_gained(address->link, &address->in_addr.in6);
 379                 if (r < 0)
 380                         return r;
 381         }
 382
 383         return 0;
 384 }
 385
 386 int address_drop(Address *address) {
 387         Link *link;
 388         bool ready;
 389         int r;
 390
 391         assert(address);
 392
 393         ready = address_is_ready(address);
 394         link = address->link;
 395
 396         r = address_release(address);
 397         if (r < 0)
 398                 log_link_warning_errno(link, r, "Failed to disable IP masquerading, ignoring: %m");
 399
 400         address_free(address);
 401
 402         link_update_operstate(link, true);
 403
 404         if (link && !ready)
 405                 link_check_ready(link);
 406
 407         return 0;
 408 }
 409
 410 int address_get(Link *link,
 411                 int family,
 412                 const union in_addr_union *in_addr,
 413                 unsigned char prefixlen,
 414                 Address **ret) {
 415
 416         Address address, *existing;
 417
 418         assert(link);
 419         assert(in_addr);
 420
 421         address = (Address) {
 422                 .family = family,
 423                 .in_addr = *in_addr,
 424                 .prefixlen = prefixlen,
 425         };
 426
 427         existing = set_get(link->addresses, &address);
 428         if (existing) {
 429                 if (ret)
 430                         *ret = existing;
 431                 return 1;
 432         }
 433
 434         existing = set_get(link->addresses_foreign, &address);
 435         if (existing) {
 436                 if (ret)
 437                         *ret = existing;
 438                 return 0;
 439         }
 440
 441         return -ENOENT;
 442 }
 443
 444 static int address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 445         int r;
 446
 447         assert(m);
 448         assert(link);
 449         assert(link->ifname);
 450
 451         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 452                 return 1;
 453
 454         r = sd_netlink_message_get_errno(m);
 455         if (r < 0 && r != -EADDRNOTAVAIL)
 456                 log_link_message_warning_errno(link, m, r, "Could not drop address");
 457
 458         return 1;
 459 }
 460
 461 int address_remove(
 462                 Address *address,
 463                 Link *link,
 464                 link_netlink_message_handler_t callback) {
 465
 466         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 467         int r;
 468
 469         assert(address);
 470         assert(IN_SET(address->family, AF_INET, AF_INET6));
 471         assert(link);
 472         assert(link->ifindex > 0);
 473         assert(link->manager);
 474         assert(link->manager->rtnl);
 475
 476         if (DEBUG_LOGGING) {
 477                 _cleanup_free_ char *b = NULL;
 478
 479                 (void) in_addr_to_string(address->family, &address->in_addr, &b);
 480                 log_link_debug(link, "Removing address %s", strna(b));
 481         }
 482
 483         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 484                                      link->ifindex, address->family);
 485         if (r < 0)
 486                 return log_link_error_errno(link, r, "Could not allocate RTM_DELADDR message: %m");
 487
 488         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 489         if (r < 0)
 490                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 491
 492         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 493         if (r < 0)
 494                 return log_link_error_errno(link, r, "Could not append IFA_LOCAL attribute: %m");
 495
 496         r = netlink_call_async(link->manager->rtnl, NULL, req,
 497                                callback ?: address_remove_handler,
 498                                link_netlink_destroy_callback, link);
 499         if (r < 0)
 500                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 501
 502         link_ref(link);
 503
 504         return 0;
 505 }
 506
 507 static int address_acquire(Link *link, Address *original, Address **ret) {
 508         union in_addr_union in_addr = IN_ADDR_NULL;
 509         struct in_addr broadcast = {};
 510         _cleanup_(address_freep) Address *na = NULL;
 511         int r;
 512
 513         assert(link);
 514         assert(original);
 515         assert(ret);
 516
 517         /* Something useful was configured? just use it */
 518         r = in_addr_is_null(original->family, &original->in_addr);
 519         if (r <= 0)
 520                 return r;
 521
 522         /* The address is configured to be 0.0.0.0 or [::] by the user?
 523          * Then let's acquire something more useful from the pool. */
 524         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 525         if (r < 0)
 526                 return r;
 527         if (r == 0)
 528                 return -EBUSY;
 529
 530         if (original->family == AF_INET) {
 531                 /* Pick first address in range for ourselves ... */
 532                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 533
 534                 /* .. and use last as broadcast address */
 535                 if (original->prefixlen > 30)
 536                         broadcast.s_addr = 0;
 537                 else
 538                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 539         } else if (original->family == AF_INET6)
 540                 in_addr.in6.s6_addr[15] |= 1;
 541
 542         r = address_new(&na);
 543         if (r < 0)
 544                 return r;
 545
 546         na->family = original->family;
 547         na->prefixlen = original->prefixlen;
 548         na->scope = original->scope;
 549         na->cinfo = original->cinfo;
 550
 551         if (original->label) {
 552                 na->label = strdup(original->label);
 553                 if (!na->label)
 554                         return -ENOMEM;
 555         }
 556
 557         na->broadcast = broadcast;
 558         na->in_addr = in_addr;
 559
 560         LIST_PREPEND(addresses, link->pool_addresses, na);
 561
 562         *ret = TAKE_PTR(na);
 563
 564         return 0;
 565 }
 566
 567 int address_configure(
 568                 Address *address,
 569                 Link *link,
 570                 link_netlink_message_handler_t callback,
 571                 bool update) {
 572
 573         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 574         int r;
 575
 576         assert(address);
 577         assert(IN_SET(address->family, AF_INET, AF_INET6));
 578         assert(link);
 579         assert(link->ifindex > 0);
 580         assert(link->manager);
 581         assert(link->manager->rtnl);
 582         assert(callback);
 583
 584         /* If this is a new address, then refuse adding more than the limit */
 585         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 586             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 587                 return log_link_error_errno(link, SYNTHETIC_ERRNO(E2BIG),
 588                                             "Too many addresses are configured, refusing: %m");
 589
 590         r = address_acquire(link, address, &address);
 591         if (r < 0)
 592                 return log_link_error_errno(link, r, "Failed to acquire an address from pool: %m");
 593
 594         if (update)
 595                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 596                                                     link->ifindex, address->family);
 597         else
 598                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 599                                              link->ifindex, address->family);
 600         if (r < 0)
 601                 return log_link_error_errno(link, r, "Could not allocate RTM_NEWADDR message: %m");
 602
 603         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 604         if (r < 0)
 605                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 606
 607         address->flags |= IFA_F_PERMANENT;
 608
 609         if (address->home_address)
 610                 address->flags |= IFA_F_HOMEADDRESS;
 611
 612         if (!FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6))
 613                 address->flags |= IFA_F_NODAD;
 614
 615         if (address->manage_temporary_address)
 616                 address->flags |= IFA_F_MANAGETEMPADDR;
 617
 618         if (!address->prefix_route)
 619                 address->flags |= IFA_F_NOPREFIXROUTE;
 620
 621         if (address->autojoin)
 622                 address->flags |= IFA_F_MCAUTOJOIN;
 623
 624         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 625         if (r < 0)
 626                 return log_link_error_errno(link, r, "Could not set flags: %m");
 627
 628         if (address->flags & ~0xff) {
 629                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 630                 if (r < 0)
 631                         return log_link_error_errno(link, r, "Could not set extended flags: %m");
 632         }
 633
 634         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 635         if (r < 0)
 636                 return log_link_error_errno(link, r, "Could not set scope: %m");
 637
 638         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 639         if (r < 0)
 640                 return log_link_error_errno(link, r, "Could not append IFA_LOCAL attribute: %m");
 641
 642         if (in_addr_is_null(address->family, &address->in_addr_peer) == 0) {
 643                 r = netlink_message_append_in_addr_union(req, IFA_ADDRESS, address->family, &address->in_addr_peer);
 644                 if (r < 0)
 645                         return log_link_error_errno(link, r, "Could not append IFA_ADDRESS attribute: %m");
 646         } else if (address->family == AF_INET && address->prefixlen <= 30) {
 647                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 648                 if (r < 0)
 649                         return log_link_error_errno(link, r, "Could not append IFA_BROADCAST attribute: %m");
 650         }
 651
 652         if (address->label) {
 653                 r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
 654                 if (r < 0)
 655                         return log_link_error_errno(link, r, "Could not append IFA_LABEL attribute: %m");
 656         }
 657
 658         r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
 659         if (r < 0)
 660                 return log_link_error_errno(link, r, "Could not append IFA_CACHEINFO attribute: %m");
 661
 662         r = address_establish(address, link);
 663         if (r < 0)
 664                 log_link_warning_errno(link, r, "Could not enable IP masquerading, ignoring: %m");
 665
 666         r = netlink_call_async(link->manager->rtnl, NULL, req, callback, link_netlink_destroy_callback, link);
 667         if (r < 0) {
 668                 address_release(address);
 669                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 670         }
 671
 672         link_ref(link);
 673
 674         if (address->family == AF_INET6 && !in_addr_is_null(address->family, &address->in_addr_peer))
 675                 r = address_add(link, address->family, &address->in_addr_peer, address->prefixlen, NULL);
 676         else
 677                 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 678         if (r < 0) {
 679                 address_release(address);
 680                 return log_link_error_errno(link, r, "Could not add address: %m");
 681         }
 682
 683         if (address->acd) {
 684                 assert(address->family == AF_INET);
 685                 if (DEBUG_LOGGING) {
 686                         _cleanup_free_ char *pretty = NULL;
 687
 688                         (void) in_addr_to_string(address->family, &address->in_addr, &pretty);
 689                         log_link_debug(link, "Starting IPv4ACD client. Probing address %s", strna(pretty));
 690                 }
 691
 692                 r = sd_ipv4acd_start(address->acd, true);
 693                 if (r < 0)
 694                         log_link_warning_errno(link, r, "Failed to start IPv4ACD client, ignoring: %m");
 695         }
 696
 697         return 1;
 698 }
 699
 700 static void static_address_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
 701         _cleanup_free_ char *pretty = NULL;
 702         Address *address;
 703         Link *link;
 704         int r;
 705
 706         assert(acd);
 707         assert(userdata);
 708
 709         address = (Address *) userdata;
 710         link = address->link;
 711
 712         (void) in_addr_to_string(address->family, &address->in_addr, &pretty);
 713         switch (event) {
 714         case SD_IPV4ACD_EVENT_STOP:
 715                 log_link_debug(link, "Stopping ACD client...");
 716                 return;
 717
 718         case SD_IPV4ACD_EVENT_BIND:
 719                 log_link_debug(link, "Successfully claimed address %s", strna(pretty));
 720                 link_check_ready(link);
 721                 break;
 722
 723         case SD_IPV4ACD_EVENT_CONFLICT:
 724                 log_link_warning(link, "DAD conflict. Dropping address %s", strna(pretty));
 725                 r = address_remove(address, link, NULL);
 726                 if (r < 0)
 727                         log_link_error_errno(link, r, "Failed to drop DAD conflicted address %s", strna(pretty));;
 728
 729                 link_check_ready(link);
 730                 break;
 731
 732         default:
 733                 assert_not_reached("Invalid IPv4ACD event.");
 734         }
 735
 736         sd_ipv4acd_stop(acd);
 737
 738         return;
 739 }
 740
 741 int configure_ipv4_duplicate_address_detection(Link *link, Address *address) {
 742         int r;
 743
 744         assert(link);
 745         assert(address);
 746         assert(address->family == AF_INET);
 747         assert(!address->link && address->network);
 748
 749         address->link = link;
 750
 751         r = sd_ipv4acd_new(&address->acd);
 752         if (r < 0)
 753                 return r;
 754
 755         r = sd_ipv4acd_attach_event(address->acd, NULL, 0);
 756         if (r < 0)
 757                 return r;
 758
 759         r = sd_ipv4acd_set_ifindex(address->acd, link->ifindex);
 760         if (r < 0)
 761                 return r;
 762
 763         r = sd_ipv4acd_set_mac(address->acd, &link->mac);
 764         if (r < 0)
 765                 return r;
 766
 767         r = sd_ipv4acd_set_address(address->acd, &address->in_addr.in);
 768         if (r < 0)
 769                 return r;
 770
 771         r = sd_ipv4acd_set_callback(address->acd, static_address_on_acd, address);
 772         if (r < 0)
 773                 return r;
 774
 775         return 0;
 776 }
 777
 778 int config_parse_broadcast(
 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         Network *network = userdata;
 791         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 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 (n->family == AF_INET6) {
 805                 log_syntax(unit, LOG_ERR, filename, line, 0,
 806                            "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 807                 return 0;
 808         }
 809
 810         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 811         if (r < 0) {
 812                 log_syntax(unit, LOG_ERR, filename, line, r,
 813                            "Broadcast is invalid, ignoring assignment: %s", rvalue);
 814                 return 0;
 815         }
 816
 817         n->family = AF_INET;
 818         n = NULL;
 819
 820         return 0;
 821 }
 822
 823 int config_parse_address(const char *unit,
 824                 const char *filename,
 825                 unsigned line,
 826                 const char *section,
 827                 unsigned section_line,
 828                 const char *lvalue,
 829                 int ltype,
 830                 const char *rvalue,
 831                 void *data,
 832                 void *userdata) {
 833
 834         Network *network = userdata;
 835         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 836         union in_addr_union buffer;
 837         unsigned char prefixlen;
 838         int r, f;
 839
 840         assert(filename);
 841         assert(section);
 842         assert(lvalue);
 843         assert(rvalue);
 844         assert(data);
 845
 846         if (streq(section, "Network")) {
 847                 /* we are not in an Address section, so treat
 848                  * this as the special '0' section */
 849                 r = address_new_static(network, NULL, 0, &n);
 850         } else
 851                 r = address_new_static(network, filename, section_line, &n);
 852
 853         if (r < 0)
 854                 return r;
 855
 856         /* Address=address/prefixlen */
 857         r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_REFUSE, &f, &buffer, &prefixlen);
 858         if (r == -ENOANO) {
 859                 log_syntax(unit, LOG_ERR, filename, line, r,
 860                            "An address '%s' is specified without prefix length. "
 861                            "The behavior of parsing addresses without prefix length will be changed in the future release. "
 862                            "Please specify prefix length explicitly.", rvalue);
 863
 864                 r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_LEGACY, &f, &buffer, &prefixlen);
 865         }
 866         if (r < 0) {
 867                 log_syntax(unit, LOG_ERR, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue);
 868                 return 0;
 869         }
 870
 871         if (n->family != AF_UNSPEC && f != n->family) {
 872                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue);
 873                 return 0;
 874         }
 875
 876         if (in_addr_is_null(f, &buffer)) {
 877                 /* Will use address from address pool. Note that for ipv6 case, prefix of the address
 878                  * pool is 8, but 40 bit is used by the global ID and 16 bit by the subnet ID. So,
 879                  * let's limit the prefix length to 64 or larger. See RFC4193. */
 880                 if ((f == AF_INET && prefixlen < 8) ||
 881                     (f == AF_INET6 && prefixlen < 64)) {
 882                         log_syntax(unit, LOG_ERR, filename, line, 0,
 883                                    "Null address with invalid prefixlen='%u', ignoring assignment: %s",
 884                                    prefixlen, rvalue);
 885                         return 0;
 886                 }
 887         }
 888
 889         n->family = f;
 890         n->prefixlen = prefixlen;
 891
 892         if (streq(lvalue, "Address"))
 893                 n->in_addr = buffer;
 894         else
 895                 n->in_addr_peer = buffer;
 896
 897         if (n->family == AF_INET && n->broadcast.s_addr == 0 && n->prefixlen <= 30)
 898                 n->broadcast.s_addr = n->in_addr.in.s_addr | htobe32(0xfffffffflu >> n->prefixlen);
 899
 900         n = NULL;
 901
 902         return 0;
 903 }
 904
 905 int config_parse_label(
 906                 const char *unit,
 907                 const char *filename,
 908                 unsigned line,
 909                 const char *section,
 910                 unsigned section_line,
 911                 const char *lvalue,
 912                 int ltype,
 913                 const char *rvalue,
 914                 void *data,
 915                 void *userdata) {
 916
 917         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 918         Network *network = userdata;
 919         int r;
 920
 921         assert(filename);
 922         assert(section);
 923         assert(lvalue);
 924         assert(rvalue);
 925         assert(data);
 926
 927         r = address_new_static(network, filename, section_line, &n);
 928         if (r < 0)
 929                 return r;
 930
 931         if (!address_label_valid(rvalue)) {
 932                 log_syntax(unit, LOG_ERR, filename, line, 0,
 933                            "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 934                 return 0;
 935         }
 936
 937         r = free_and_strdup(&n->label, rvalue);
 938         if (r < 0)
 939                 return log_oom();
 940
 941         n = NULL;
 942         return 0;
 943 }
 944
 945 int config_parse_lifetime(const char *unit,
 946                           const char *filename,
 947                           unsigned line,
 948                           const char *section,
 949                           unsigned section_line,
 950                           const char *lvalue,
 951                           int ltype,
 952                           const char *rvalue,
 953                           void *data,
 954                           void *userdata) {
 955         Network *network = userdata;
 956         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 957         uint32_t k;
 958         int r;
 959
 960         assert(filename);
 961         assert(section);
 962         assert(lvalue);
 963         assert(rvalue);
 964         assert(data);
 965
 966         r = address_new_static(network, filename, section_line, &n);
 967         if (r < 0)
 968                 return r;
 969
 970         /* We accept only "forever", "infinity", empty, or "0". */
 971         if (STR_IN_SET(rvalue, "forever", "infinity", ""))
 972                 k = CACHE_INFO_INFINITY_LIFE_TIME;
 973         else if (streq(rvalue, "0"))
 974                 k = 0;
 975         else {
 976                 log_syntax(unit, LOG_ERR, filename, line, 0,
 977                            "Invalid PreferredLifetime= value, ignoring: %s", rvalue);
 978                 return 0;
 979         }
 980
 981         n->cinfo.ifa_prefered = k;
 982         TAKE_PTR(n);
 983
 984         return 0;
 985 }
 986
 987 int config_parse_address_flags(const char *unit,
 988                                const char *filename,
 989                                unsigned line,
 990                                const char *section,
 991                                unsigned section_line,
 992                                const char *lvalue,
 993                                int ltype,
 994                                const char *rvalue,
 995                                void *data,
 996                                void *userdata) {
 997         Network *network = userdata;
 998         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 999         int r;
1000
1001         assert(filename);
1002         assert(section);
1003         assert(lvalue);
1004         assert(rvalue);
1005         assert(data);
1006
1007         r = address_new_static(network, filename, section_line, &n);
1008         if (r < 0)
1009                 return r;
1010
1011         r = parse_boolean(rvalue);
1012         if (r < 0) {
1013                 log_syntax(unit, LOG_ERR, filename, line, r,
1014                            "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
1015                 return 0;
1016         }
1017
1018         if (streq(lvalue, "HomeAddress"))
1019                 n->home_address = r;
1020         else if (streq(lvalue, "ManageTemporaryAddress"))
1021                 n->manage_temporary_address = r;
1022         else if (streq(lvalue, "PrefixRoute"))
1023                 n->prefix_route = !r;
1024         else if (streq(lvalue, "AddPrefixRoute"))
1025                 n->prefix_route = r;
1026         else if (streq(lvalue, "AutoJoin"))
1027                 n->autojoin = r;
1028         else
1029                 assert_not_reached("Invalid address flag type.");
1030
1031         n = NULL;
1032         return 0;
1033 }
1034
1035 int config_parse_address_scope(const char *unit,
1036                                const char *filename,
1037                                unsigned line,
1038                                const char *section,
1039                                unsigned section_line,
1040                                const char *lvalue,
1041                                int ltype,
1042                                const char *rvalue,
1043                                void *data,
1044                                void *userdata) {
1045         Network *network = userdata;
1046         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
1047         int r;
1048
1049         assert(filename);
1050         assert(section);
1051         assert(lvalue);
1052         assert(rvalue);
1053         assert(data);
1054
1055         r = address_new_static(network, filename, section_line, &n);
1056         if (r < 0)
1057                 return r;
1058
1059         if (streq(rvalue, "host"))
1060                 n->scope = RT_SCOPE_HOST;
1061         else if (streq(rvalue, "link"))
1062                 n->scope = RT_SCOPE_LINK;
1063         else if (streq(rvalue, "global"))
1064                 n->scope = RT_SCOPE_UNIVERSE;
1065         else {
1066                 r = safe_atou8(rvalue , &n->scope);
1067                 if (r < 0) {
1068                         log_syntax(unit, LOG_ERR, filename, line, r,
1069                                    "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
1070                         return 0;
1071                 }
1072         }
1073
1074         n->scope_set = true;
1075         n = NULL;
1076         return 0;
1077 }
1078
1079 int config_parse_duplicate_address_detection(
1080                 const char *unit,
1081                 const char *filename,
1082                 unsigned line,
1083                 const char *section,
1084                 unsigned section_line,
1085                 const char *lvalue,
1086                 int ltype,
1087                 const char *rvalue,
1088                 void *data,
1089                 void *userdata) {
1090         Network *network = userdata;
1091         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
1092         AddressFamily a;
1093         int r;
1094
1095         assert(filename);
1096         assert(section);
1097         assert(lvalue);
1098         assert(rvalue);
1099         assert(data);
1100
1101         r = address_new_static(network, filename, section_line, &n);
1102         if (r < 0)
1103                 return r;
1104
1105         r = parse_boolean(rvalue);
1106         if (r >= 0) {
1107                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1108                            "For historical reasons, %s=%s means %s=%s. "
1109                            "Please use 'both', 'ipv4', 'ipv6' or 'none' instead.",
1110                            lvalue, rvalue, lvalue, r ? "none" : "both");
1111                 n->duplicate_address_detection = r ? ADDRESS_FAMILY_NO : ADDRESS_FAMILY_YES;
1112                 n = NULL;
1113                 return 0;
1114         }
1115
1116         a = duplicate_address_detection_address_family_from_string(rvalue);
1117         if (a < 0) {
1118                 log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
1119                            "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
1120                 return 0;
1121         }
1122
1123         n->duplicate_address_detection = a;
1124         n = NULL;
1125         return 0;
1126 }
1127
1128 bool address_is_ready(const Address *a) {
1129         assert(a);
1130
1131         return !(a->flags & IFA_F_TENTATIVE);
1132 }
1133
1134 int address_section_verify(Address *address) {
1135         if (section_is_invalid(address->section))
1136                 return -EINVAL;
1137
1138         if (address->family == AF_UNSPEC) {
1139                 assert(address->section);
1140
1141                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
1142                                          "%s: Address section without Address= field configured. "
1143                                          "Ignoring [Address] section from line %u.",
1144                                          address->section->filename, address->section->line);
1145         }
1146
1147         if (!address->scope_set && in_addr_is_localhost(address->family, &address->in_addr) > 0)
1148                 address->scope = RT_SCOPE_HOST;
1149
1150         return 0;
1151 }