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_put(addresses, &address_hash_ops, address);
 270         if (r < 0)
 271                 return r;
 272         if (r == 0)
 273                 return -EEXIST;
 274
 275         address->link = link;
 276
 277         if (ret)
 278                 *ret = address;
 279         TAKE_PTR(address);
 280         return 0;
 281 }
 282
 283 int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 284         return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret);
 285 }
 286
 287 int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 288         Address *address;
 289         int r;
 290
 291         r = address_get(link, family, in_addr, prefixlen, &address);
 292         if (r == -ENOENT) {
 293                 /* Address does not exist, create a new one */
 294                 r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address);
 295                 if (r < 0)
 296                         return r;
 297         } else if (r == 0) {
 298                 /* Take over a foreign address */
 299                 r = set_ensure_put(&link->addresses, &address_hash_ops, 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                         return r;
 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, true);
 360         link_check_ready(address->link);
 361
 362         if (!ready &&
 363             address_is_ready(address) &&
 364             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         return 0;
 374 }
 375
 376 int address_drop(Address *address) {
 377         Link *link;
 378         bool ready;
 379         int r;
 380
 381         assert(address);
 382
 383         ready = address_is_ready(address);
 384         link = address->link;
 385
 386         r = address_release(address);
 387         if (r < 0)
 388                 log_link_warning_errno(link, r, "Failed to disable IP masquerading, ignoring: %m");
 389
 390         address_free(address);
 391
 392         link_update_operstate(link, true);
 393
 394         if (link && !ready)
 395                 link_check_ready(link);
 396
 397         return 0;
 398 }
 399
 400 int address_get(Link *link,
 401                 int family,
 402                 const union in_addr_union *in_addr,
 403                 unsigned char prefixlen,
 404                 Address **ret) {
 405
 406         Address address, *existing;
 407
 408         assert(link);
 409         assert(in_addr);
 410
 411         address = (Address) {
 412                 .family = family,
 413                 .in_addr = *in_addr,
 414                 .prefixlen = prefixlen,
 415         };
 416
 417         existing = set_get(link->addresses, &address);
 418         if (existing) {
 419                 if (ret)
 420                         *ret = existing;
 421                 return 1;
 422         }
 423
 424         existing = set_get(link->addresses_foreign, &address);
 425         if (existing) {
 426                 if (ret)
 427                         *ret = existing;
 428                 return 0;
 429         }
 430
 431         return -ENOENT;
 432 }
 433
 434 static int address_remove_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 435         int r;
 436
 437         assert(m);
 438         assert(link);
 439         assert(link->ifname);
 440
 441         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 442                 return 1;
 443
 444         r = sd_netlink_message_get_errno(m);
 445         if (r < 0 && r != -EADDRNOTAVAIL)
 446                 log_link_message_warning_errno(link, m, r, "Could not drop address");
 447         else
 448                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
 449
 450         return 1;
 451 }
 452
 453 int address_remove(
 454                 Address *address,
 455                 Link *link,
 456                 link_netlink_message_handler_t callback) {
 457
 458         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 459         int r;
 460
 461         assert(address);
 462         assert(IN_SET(address->family, AF_INET, AF_INET6));
 463         assert(link);
 464         assert(link->ifindex > 0);
 465         assert(link->manager);
 466         assert(link->manager->rtnl);
 467
 468         if (DEBUG_LOGGING) {
 469                 _cleanup_free_ char *b = NULL;
 470
 471                 (void) in_addr_to_string(address->family, &address->in_addr, &b);
 472                 log_link_debug(link, "Removing address %s", strna(b));
 473         }
 474
 475         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 476                                      link->ifindex, address->family);
 477         if (r < 0)
 478                 return log_link_error_errno(link, r, "Could not allocate RTM_DELADDR message: %m");
 479
 480         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 481         if (r < 0)
 482                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 483
 484         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 485         if (r < 0)
 486                 return log_link_error_errno(link, r, "Could not append IFA_LOCAL attribute: %m");
 487
 488         r = netlink_call_async(link->manager->rtnl, NULL, req,
 489                                callback ?: address_remove_handler,
 490                                link_netlink_destroy_callback, link);
 491         if (r < 0)
 492                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 493
 494         link_ref(link);
 495
 496         return 0;
 497 }
 498
 499 static int address_acquire(Link *link, Address *original, Address **ret) {
 500         union in_addr_union in_addr = IN_ADDR_NULL;
 501         struct in_addr broadcast = {};
 502         _cleanup_(address_freep) Address *na = NULL;
 503         int r;
 504
 505         assert(link);
 506         assert(original);
 507         assert(ret);
 508
 509         /* Something useful was configured? just use it */
 510         r = in_addr_is_null(original->family, &original->in_addr);
 511         if (r <= 0)
 512                 return r;
 513
 514         /* The address is configured to be 0.0.0.0 or [::] by the user?
 515          * Then let's acquire something more useful from the pool. */
 516         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 517         if (r < 0)
 518                 return r;
 519         if (r == 0)
 520                 return -EBUSY;
 521
 522         if (original->family == AF_INET) {
 523                 /* Pick first address in range for ourselves ... */
 524                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 525
 526                 /* .. and use last as broadcast address */
 527                 if (original->prefixlen > 30)
 528                         broadcast.s_addr = 0;
 529                 else
 530                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 531         } else if (original->family == AF_INET6)
 532                 in_addr.in6.s6_addr[15] |= 1;
 533
 534         r = address_new(&na);
 535         if (r < 0)
 536                 return r;
 537
 538         na->family = original->family;
 539         na->prefixlen = original->prefixlen;
 540         na->scope = original->scope;
 541         na->cinfo = original->cinfo;
 542
 543         if (original->label) {
 544                 na->label = strdup(original->label);
 545                 if (!na->label)
 546                         return -ENOMEM;
 547         }
 548
 549         na->broadcast = broadcast;
 550         na->in_addr = in_addr;
 551
 552         LIST_PREPEND(addresses, link->pool_addresses, na);
 553
 554         *ret = TAKE_PTR(na);
 555
 556         return 0;
 557 }
 558
 559 int address_configure(
 560                 Address *address,
 561                 Link *link,
 562                 link_netlink_message_handler_t callback,
 563                 bool update) {
 564
 565         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 566         int r;
 567
 568         assert(address);
 569         assert(IN_SET(address->family, AF_INET, AF_INET6));
 570         assert(link);
 571         assert(link->ifindex > 0);
 572         assert(link->manager);
 573         assert(link->manager->rtnl);
 574         assert(callback);
 575
 576         /* If this is a new address, then refuse adding more than the limit */
 577         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 578             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 579                 return log_link_error_errno(link, SYNTHETIC_ERRNO(E2BIG),
 580                                             "Too many addresses are configured, refusing: %m");
 581
 582         r = address_acquire(link, address, &address);
 583         if (r < 0)
 584                 return log_link_error_errno(link, r, "Failed to acquire an address from pool: %m");
 585
 586         if (update)
 587                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 588                                                     link->ifindex, address->family);
 589         else
 590                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 591                                              link->ifindex, address->family);
 592         if (r < 0)
 593                 return log_link_error_errno(link, r, "Could not allocate RTM_NEWADDR message: %m");
 594
 595         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 596         if (r < 0)
 597                 return log_link_error_errno(link, r, "Could not set prefixlen: %m");
 598
 599         address->flags |= IFA_F_PERMANENT;
 600
 601         if (address->home_address)
 602                 address->flags |= IFA_F_HOMEADDRESS;
 603
 604         if (!FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV6))
 605                 address->flags |= IFA_F_NODAD;
 606
 607         if (address->manage_temporary_address)
 608                 address->flags |= IFA_F_MANAGETEMPADDR;
 609
 610         if (!address->prefix_route)
 611                 address->flags |= IFA_F_NOPREFIXROUTE;
 612
 613         if (address->autojoin)
 614                 address->flags |= IFA_F_MCAUTOJOIN;
 615
 616         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 617         if (r < 0)
 618                 return log_link_error_errno(link, r, "Could not set flags: %m");
 619
 620         if (address->flags & ~0xff) {
 621                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 622                 if (r < 0)
 623                         return log_link_error_errno(link, r, "Could not set extended flags: %m");
 624         }
 625
 626         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 627         if (r < 0)
 628                 return log_link_error_errno(link, r, "Could not set scope: %m");
 629
 630         r = netlink_message_append_in_addr_union(req, IFA_LOCAL, address->family, &address->in_addr);
 631         if (r < 0)
 632                 return log_link_error_errno(link, r, "Could not append IFA_LOCAL attribute: %m");
 633
 634         if (in_addr_is_null(address->family, &address->in_addr_peer) == 0) {
 635                 r = netlink_message_append_in_addr_union(req, IFA_ADDRESS, address->family, &address->in_addr_peer);
 636                 if (r < 0)
 637                         return log_link_error_errno(link, r, "Could not append IFA_ADDRESS attribute: %m");
 638         } else if (address->family == AF_INET && address->prefixlen <= 30) {
 639                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 640                 if (r < 0)
 641                         return log_link_error_errno(link, r, "Could not append IFA_BROADCAST attribute: %m");
 642         }
 643
 644         if (address->label) {
 645                 r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
 646                 if (r < 0)
 647                         return log_link_error_errno(link, r, "Could not append IFA_LABEL attribute: %m");
 648         }
 649
 650         r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO, &address->cinfo);
 651         if (r < 0)
 652                 return log_link_error_errno(link, r, "Could not append IFA_CACHEINFO attribute: %m");
 653
 654         r = address_establish(address, link);
 655         if (r < 0)
 656                 log_link_warning_errno(link, r, "Could not enable IP masquerading, ignoring: %m");
 657
 658         r = netlink_call_async(link->manager->rtnl, NULL, req, callback, link_netlink_destroy_callback, link);
 659         if (r < 0) {
 660                 address_release(address);
 661                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
 662         }
 663
 664         link_ref(link);
 665
 666         if (address->family == AF_INET6 && !in_addr_is_null(address->family, &address->in_addr_peer))
 667                 r = address_add(link, address->family, &address->in_addr_peer, address->prefixlen, NULL);
 668         else
 669                 r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 670         if (r < 0) {
 671                 address_release(address);
 672                 return log_link_error_errno(link, r, "Could not add address: %m");
 673         }
 674
 675         if (address->acd) {
 676                 assert(address->family == AF_INET);
 677                 if (DEBUG_LOGGING) {
 678                         _cleanup_free_ char *pretty = NULL;
 679
 680                         (void) in_addr_to_string(address->family, &address->in_addr, &pretty);
 681                         log_link_debug(link, "Starting IPv4ACD client. Probing address %s", strna(pretty));
 682                 }
 683
 684                 r = sd_ipv4acd_start(address->acd, true);
 685                 if (r < 0)
 686                         log_link_warning_errno(link, r, "Failed to start IPv4ACD client, ignoring: %m");
 687         }
 688
 689         return 1;
 690 }
 691
 692 static void static_address_on_acd(sd_ipv4acd *acd, int event, void *userdata) {
 693         _cleanup_free_ char *pretty = NULL;
 694         Address *address;
 695         Link *link;
 696         int r;
 697
 698         assert(acd);
 699         assert(userdata);
 700
 701         address = (Address *) userdata;
 702         link = address->link;
 703
 704         (void) in_addr_to_string(address->family, &address->in_addr, &pretty);
 705         switch (event) {
 706         case SD_IPV4ACD_EVENT_STOP:
 707                 log_link_debug(link, "Stopping ACD client...");
 708                 return;
 709
 710         case SD_IPV4ACD_EVENT_BIND:
 711                 log_link_debug(link, "Successfully claimed address %s", strna(pretty));
 712                 link_check_ready(link);
 713                 break;
 714
 715         case SD_IPV4ACD_EVENT_CONFLICT:
 716                 log_link_warning(link, "DAD conflict. Dropping address %s", strna(pretty));
 717                 r = address_remove(address, link, NULL);
 718                 if (r < 0)
 719                         log_link_error_errno(link, r, "Failed to drop DAD conflicted address %s", strna(pretty));;
 720
 721                 link_check_ready(link);
 722                 break;
 723
 724         default:
 725                 assert_not_reached("Invalid IPv4ACD event.");
 726         }
 727
 728         sd_ipv4acd_stop(acd);
 729
 730         return;
 731 }
 732
 733 int configure_ipv4_duplicate_address_detection(Link *link, Address *address) {
 734         int r;
 735
 736         assert(link);
 737         assert(address);
 738         assert(address->family == AF_INET);
 739         assert(!address->link && address->network);
 740
 741         address->link = link;
 742
 743         r = sd_ipv4acd_new(&address->acd);
 744         if (r < 0)
 745                 return r;
 746
 747         r = sd_ipv4acd_attach_event(address->acd, NULL, 0);
 748         if (r < 0)
 749                 return r;
 750
 751         r = sd_ipv4acd_set_ifindex(address->acd, link->ifindex);
 752         if (r < 0)
 753                 return r;
 754
 755         r = sd_ipv4acd_set_mac(address->acd, &link->mac);
 756         if (r < 0)
 757                 return r;
 758
 759         r = sd_ipv4acd_set_address(address->acd, &address->in_addr.in);
 760         if (r < 0)
 761                 return r;
 762
 763         r = sd_ipv4acd_set_callback(address->acd, static_address_on_acd, address);
 764         if (r < 0)
 765                 return r;
 766
 767         return 0;
 768 }
 769
 770 int config_parse_broadcast(
 771                 const char *unit,
 772                 const char *filename,
 773                 unsigned line,
 774                 const char *section,
 775                 unsigned section_line,
 776                 const char *lvalue,
 777                 int ltype,
 778                 const char *rvalue,
 779                 void *data,
 780                 void *userdata) {
 781
 782         Network *network = userdata;
 783         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 784         int r;
 785
 786         assert(filename);
 787         assert(section);
 788         assert(lvalue);
 789         assert(rvalue);
 790         assert(data);
 791
 792         r = address_new_static(network, filename, section_line, &n);
 793         if (r < 0)
 794                 return r;
 795
 796         if (n->family == AF_INET6) {
 797                 log_syntax(unit, LOG_ERR, filename, line, 0,
 798                            "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 799                 return 0;
 800         }
 801
 802         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 803         if (r < 0) {
 804                 log_syntax(unit, LOG_ERR, filename, line, r,
 805                            "Broadcast is invalid, ignoring assignment: %s", rvalue);
 806                 return 0;
 807         }
 808
 809         n->family = AF_INET;
 810         n = NULL;
 811
 812         return 0;
 813 }
 814
 815 int config_parse_address(const char *unit,
 816                 const char *filename,
 817                 unsigned line,
 818                 const char *section,
 819                 unsigned section_line,
 820                 const char *lvalue,
 821                 int ltype,
 822                 const char *rvalue,
 823                 void *data,
 824                 void *userdata) {
 825
 826         Network *network = userdata;
 827         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 828         union in_addr_union buffer;
 829         unsigned char prefixlen;
 830         int r, f;
 831
 832         assert(filename);
 833         assert(section);
 834         assert(lvalue);
 835         assert(rvalue);
 836         assert(data);
 837
 838         if (streq(section, "Network")) {
 839                 /* we are not in an Address section, so treat
 840                  * this as the special '0' section */
 841                 r = address_new_static(network, NULL, 0, &n);
 842         } else
 843                 r = address_new_static(network, filename, section_line, &n);
 844
 845         if (r < 0)
 846                 return r;
 847
 848         /* Address=address/prefixlen */
 849         r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_REFUSE, &f, &buffer, &prefixlen);
 850         if (r == -ENOANO) {
 851                 log_syntax(unit, LOG_ERR, filename, line, r,
 852                            "An address '%s' is specified without prefix length. "
 853                            "The behavior of parsing addresses without prefix length will be changed in the future release. "
 854                            "Please specify prefix length explicitly.", rvalue);
 855
 856                 r = in_addr_prefix_from_string_auto_internal(rvalue, PREFIXLEN_LEGACY, &f, &buffer, &prefixlen);
 857         }
 858         if (r < 0) {
 859                 log_syntax(unit, LOG_ERR, filename, line, r, "Invalid address '%s', ignoring assignment: %m", rvalue);
 860                 return 0;
 861         }
 862
 863         if (n->family != AF_UNSPEC && f != n->family) {
 864                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", rvalue);
 865                 return 0;
 866         }
 867
 868         if (in_addr_is_null(f, &buffer)) {
 869                 /* Will use address from address pool. Note that for ipv6 case, prefix of the address
 870                  * pool is 8, but 40 bit is used by the global ID and 16 bit by the subnet ID. So,
 871                  * let's limit the prefix length to 64 or larger. See RFC4193. */
 872                 if ((f == AF_INET && prefixlen < 8) ||
 873                     (f == AF_INET6 && prefixlen < 64)) {
 874                         log_syntax(unit, LOG_ERR, filename, line, 0,
 875                                    "Null address with invalid prefixlen='%u', ignoring assignment: %s",
 876                                    prefixlen, rvalue);
 877                         return 0;
 878                 }
 879         }
 880
 881         n->family = f;
 882         n->prefixlen = prefixlen;
 883
 884         if (streq(lvalue, "Address"))
 885                 n->in_addr = buffer;
 886         else
 887                 n->in_addr_peer = buffer;
 888
 889         if (n->family == AF_INET && n->broadcast.s_addr == 0 && n->prefixlen <= 30)
 890                 n->broadcast.s_addr = n->in_addr.in.s_addr | htobe32(0xfffffffflu >> n->prefixlen);
 891
 892         n = NULL;
 893
 894         return 0;
 895 }
 896
 897 int config_parse_label(
 898                 const char *unit,
 899                 const char *filename,
 900                 unsigned line,
 901                 const char *section,
 902                 unsigned section_line,
 903                 const char *lvalue,
 904                 int ltype,
 905                 const char *rvalue,
 906                 void *data,
 907                 void *userdata) {
 908
 909         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 910         Network *network = userdata;
 911         int r;
 912
 913         assert(filename);
 914         assert(section);
 915         assert(lvalue);
 916         assert(rvalue);
 917         assert(data);
 918
 919         r = address_new_static(network, filename, section_line, &n);
 920         if (r < 0)
 921                 return r;
 922
 923         if (!address_label_valid(rvalue)) {
 924                 log_syntax(unit, LOG_ERR, filename, line, 0,
 925                            "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 926                 return 0;
 927         }
 928
 929         r = free_and_strdup(&n->label, rvalue);
 930         if (r < 0)
 931                 return log_oom();
 932
 933         n = NULL;
 934         return 0;
 935 }
 936
 937 int config_parse_lifetime(const char *unit,
 938                           const char *filename,
 939                           unsigned line,
 940                           const char *section,
 941                           unsigned section_line,
 942                           const char *lvalue,
 943                           int ltype,
 944                           const char *rvalue,
 945                           void *data,
 946                           void *userdata) {
 947         Network *network = userdata;
 948         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 949         uint32_t k;
 950         int r;
 951
 952         assert(filename);
 953         assert(section);
 954         assert(lvalue);
 955         assert(rvalue);
 956         assert(data);
 957
 958         r = address_new_static(network, filename, section_line, &n);
 959         if (r < 0)
 960                 return r;
 961
 962         /* We accept only "forever", "infinity", empty, or "0". */
 963         if (STR_IN_SET(rvalue, "forever", "infinity", ""))
 964                 k = CACHE_INFO_INFINITY_LIFE_TIME;
 965         else if (streq(rvalue, "0"))
 966                 k = 0;
 967         else {
 968                 log_syntax(unit, LOG_ERR, filename, line, 0,
 969                            "Invalid PreferredLifetime= value, ignoring: %s", rvalue);
 970                 return 0;
 971         }
 972
 973         n->cinfo.ifa_prefered = k;
 974         TAKE_PTR(n);
 975
 976         return 0;
 977 }
 978
 979 int config_parse_address_flags(const char *unit,
 980                                const char *filename,
 981                                unsigned line,
 982                                const char *section,
 983                                unsigned section_line,
 984                                const char *lvalue,
 985                                int ltype,
 986                                const char *rvalue,
 987                                void *data,
 988                                void *userdata) {
 989         Network *network = userdata;
 990         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
 991         int r;
 992
 993         assert(filename);
 994         assert(section);
 995         assert(lvalue);
 996         assert(rvalue);
 997         assert(data);
 998
 999         r = address_new_static(network, filename, section_line, &n);
1000         if (r < 0)
1001                 return r;
1002
1003         r = parse_boolean(rvalue);
1004         if (r < 0) {
1005                 log_syntax(unit, LOG_ERR, filename, line, r,
1006                            "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
1007                 return 0;
1008         }
1009
1010         if (streq(lvalue, "HomeAddress"))
1011                 n->home_address = r;
1012         else if (streq(lvalue, "ManageTemporaryAddress"))
1013                 n->manage_temporary_address = r;
1014         else if (streq(lvalue, "PrefixRoute"))
1015                 n->prefix_route = !r;
1016         else if (streq(lvalue, "AddPrefixRoute"))
1017                 n->prefix_route = r;
1018         else if (streq(lvalue, "AutoJoin"))
1019                 n->autojoin = r;
1020         else
1021                 assert_not_reached("Invalid address flag type.");
1022
1023         n = NULL;
1024         return 0;
1025 }
1026
1027 int config_parse_address_scope(const char *unit,
1028                                const char *filename,
1029                                unsigned line,
1030                                const char *section,
1031                                unsigned section_line,
1032                                const char *lvalue,
1033                                int ltype,
1034                                const char *rvalue,
1035                                void *data,
1036                                void *userdata) {
1037         Network *network = userdata;
1038         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
1039         int r;
1040
1041         assert(filename);
1042         assert(section);
1043         assert(lvalue);
1044         assert(rvalue);
1045         assert(data);
1046
1047         r = address_new_static(network, filename, section_line, &n);
1048         if (r < 0)
1049                 return r;
1050
1051         if (streq(rvalue, "host"))
1052                 n->scope = RT_SCOPE_HOST;
1053         else if (streq(rvalue, "link"))
1054                 n->scope = RT_SCOPE_LINK;
1055         else if (streq(rvalue, "global"))
1056                 n->scope = RT_SCOPE_UNIVERSE;
1057         else {
1058                 r = safe_atou8(rvalue , &n->scope);
1059                 if (r < 0) {
1060                         log_syntax(unit, LOG_ERR, filename, line, r,
1061                                    "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
1062                         return 0;
1063                 }
1064         }
1065
1066         n->scope_set = true;
1067         n = NULL;
1068         return 0;
1069 }
1070
1071 int config_parse_duplicate_address_detection(
1072                 const char *unit,
1073                 const char *filename,
1074                 unsigned line,
1075                 const char *section,
1076                 unsigned section_line,
1077                 const char *lvalue,
1078                 int ltype,
1079                 const char *rvalue,
1080                 void *data,
1081                 void *userdata) {
1082         Network *network = userdata;
1083         _cleanup_(address_free_or_set_invalidp) Address *n = NULL;
1084         AddressFamily a;
1085         int r;
1086
1087         assert(filename);
1088         assert(section);
1089         assert(lvalue);
1090         assert(rvalue);
1091         assert(data);
1092
1093         r = address_new_static(network, filename, section_line, &n);
1094         if (r < 0)
1095                 return r;
1096
1097         r = parse_boolean(rvalue);
1098         if (r >= 0) {
1099                 log_syntax(unit, LOG_WARNING, filename, line, 0,
1100                            "For historical reasons, %s=%s means %s=%s. "
1101                            "Please use 'both', 'ipv4', 'ipv6' or 'none' instead.",
1102                            lvalue, rvalue, lvalue, r ? "none" : "both");
1103                 n->duplicate_address_detection = r ? ADDRESS_FAMILY_NO : ADDRESS_FAMILY_YES;
1104                 n = NULL;
1105                 return 0;
1106         }
1107
1108         a = duplicate_address_detection_address_family_from_string(rvalue);
1109         if (a < 0) {
1110                 log_syntax(unit, LOG_ERR, filename, line, SYNTHETIC_ERRNO(EINVAL),
1111                            "Failed to parse %s=, ignoring: %s", lvalue, rvalue);
1112                 return 0;
1113         }
1114
1115         n->duplicate_address_detection = a;
1116         n = NULL;
1117         return 0;
1118 }
1119
1120 bool address_is_ready(const Address *a) {
1121         assert(a);
1122
1123         return !(a->flags & IFA_F_TENTATIVE);
1124 }
1125
1126 int address_section_verify(Address *address) {
1127         if (section_is_invalid(address->section))
1128                 return -EINVAL;
1129
1130         if (address->family == AF_UNSPEC) {
1131                 assert(address->section);
1132
1133                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL),
1134                                          "%s: Address section without Address= field configured. "
1135                                          "Ignoring [Address] section from line %u.",
1136                                          address->section->filename, address->section->line);
1137         }
1138
1139         if (!address->scope_set && in_addr_is_localhost(address->family, &address->in_addr) > 0)
1140                 address->scope = RT_SCOPE_HOST;
1141
1142         return 0;
1143 }