src/network/networkd-address.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2013 Tom Gundersen <teg@jklm.no>
   4 ***/
   5
   6 #include <net/if.h>
   7
   8 #include "alloc-util.h"
   9 #include "conf-parser.h"
  10 #include "firewall-util.h"
  11 #include "netlink-util.h"
  12 #include "networkd-address.h"
  13 #include "networkd-manager.h"
  14 #include "parse-util.h"
  15 #include "set.h"
  16 #include "socket-util.h"
  17 #include "string-util.h"
  18 #include "utf8.h"
  19 #include "util.h"
  20
  21 #define ADDRESSES_PER_LINK_MAX 2048U
  22 #define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
  23
  24 int address_new(Address **ret) {
  25         _cleanup_(address_freep) Address *address = NULL;
  26
  27         address = new0(Address, 1);
  28         if (!address)
  29                 return -ENOMEM;
  30
  31         address->family = AF_UNSPEC;
  32         address->scope = RT_SCOPE_UNIVERSE;
  33         address->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
  34         address->cinfo.ifa_valid = CACHE_INFO_INFINITY_LIFE_TIME;
  35
  36         *ret = TAKE_PTR(address);
  37
  38         return 0;
  39 }
  40
  41 int address_new_static(Network *network, const char *filename, unsigned section_line, Address **ret) {
  42         _cleanup_(network_config_section_freep) NetworkConfigSection *n = NULL;
  43         _cleanup_(address_freep) Address *address = NULL;
  44         int r;
  45
  46         assert(network);
  47         assert(ret);
  48         assert(!!filename == (section_line > 0));
  49
  50         if (filename) {
  51                 r = network_config_section_new(filename, section_line, &n);
  52                 if (r < 0)
  53                         return r;
  54
  55                 address = hashmap_get(network->addresses_by_section, n);
  56                 if (address) {
  57                         *ret = TAKE_PTR(address);
  58
  59                         return 0;
  60                 }
  61         }
  62
  63         if (network->n_static_addresses >= STATIC_ADDRESSES_PER_NETWORK_MAX)
  64                 return -E2BIG;
  65
  66         r = address_new(&address);
  67         if (r < 0)
  68                 return r;
  69
  70         if (filename) {
  71                 address->section = TAKE_PTR(n);
  72
  73                 r = hashmap_put(network->addresses_by_section, address->section, address);
  74                 if (r < 0)
  75                         return r;
  76         }
  77
  78         address->network = network;
  79         LIST_APPEND(addresses, network->static_addresses, address);
  80         network->n_static_addresses++;
  81
  82         *ret = TAKE_PTR(address);
  83
  84         return 0;
  85 }
  86
  87 void address_free(Address *address) {
  88         if (!address)
  89                 return;
  90
  91         if (address->network) {
  92                 LIST_REMOVE(addresses, address->network->static_addresses, address);
  93                 assert(address->network->n_static_addresses > 0);
  94                 address->network->n_static_addresses--;
  95
  96                 if (address->section) {
  97                         hashmap_remove(address->network->addresses_by_section, address->section);
  98                         network_config_section_free(address->section);
  99                 }
 100         }
 101
 102         if (address->link) {
 103                 set_remove(address->link->addresses, address);
 104                 set_remove(address->link->addresses_foreign, address);
 105
 106                 if (in_addr_equal(AF_INET6, &address->in_addr, (const union in_addr_union *) &address->link->ipv6ll_address))
 107                         memzero(&address->link->ipv6ll_address, sizeof(struct in6_addr));
 108         }
 109
 110         free(address);
 111 }
 112
 113 static void address_hash_func(const void *b, struct siphash *state) {
 114         const Address *a = b;
 115
 116         assert(a);
 117
 118         siphash24_compress(&a->family, sizeof(a->family), state);
 119
 120         switch (a->family) {
 121         case AF_INET:
 122                 siphash24_compress(&a->prefixlen, sizeof(a->prefixlen), state);
 123
 124                 /* peer prefix */
 125                 if (a->prefixlen != 0) {
 126                         uint32_t prefix;
 127
 128                         if (a->in_addr_peer.in.s_addr != 0)
 129                                 prefix = be32toh(a->in_addr_peer.in.s_addr) >> (32 - a->prefixlen);
 130                         else
 131                                 prefix = be32toh(a->in_addr.in.s_addr) >> (32 - a->prefixlen);
 132
 133                         siphash24_compress(&prefix, sizeof(prefix), state);
 134                 }
 135
 136                 _fallthrough_;
 137         case AF_INET6:
 138                 /* local address */
 139                 siphash24_compress(&a->in_addr, FAMILY_ADDRESS_SIZE(a->family), state);
 140
 141                 break;
 142         default:
 143                 /* treat any other address family as AF_UNSPEC */
 144                 break;
 145         }
 146 }
 147
 148 static int address_compare_func(const void *c1, const void *c2) {
 149         const Address *a1 = c1, *a2 = c2;
 150
 151         if (a1->family < a2->family)
 152                 return -1;
 153         if (a1->family > a2->family)
 154                 return 1;
 155
 156         switch (a1->family) {
 157         /* use the same notion of equality as the kernel does */
 158         case AF_INET:
 159                 if (a1->prefixlen < a2->prefixlen)
 160                         return -1;
 161                 if (a1->prefixlen > a2->prefixlen)
 162                         return 1;
 163
 164                 /* compare the peer prefixes */
 165                 if (a1->prefixlen != 0) {
 166                         /* make sure we don't try to shift by 32.
 167                          * See ISO/IEC 9899:TC3 § 6.5.7.3. */
 168                         uint32_t b1, b2;
 169
 170                         if (a1->in_addr_peer.in.s_addr != 0)
 171                                 b1 = be32toh(a1->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 172                         else
 173                                 b1 = be32toh(a1->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 174
 175                         if (a2->in_addr_peer.in.s_addr != 0)
 176                                 b2 = be32toh(a2->in_addr_peer.in.s_addr) >> (32 - a1->prefixlen);
 177                         else
 178                                 b2 = be32toh(a2->in_addr.in.s_addr) >> (32 - a1->prefixlen);
 179
 180                         if (b1 < b2)
 181                                 return -1;
 182                         if (b1 > b2)
 183                                 return 1;
 184                 }
 185
 186                 _fallthrough_;
 187         case AF_INET6:
 188                 return memcmp(&a1->in_addr, &a2->in_addr, FAMILY_ADDRESS_SIZE(a1->family));
 189         default:
 190                 /* treat any other address family as AF_UNSPEC */
 191                 return 0;
 192         }
 193 }
 194
 195 static const struct hash_ops address_hash_ops = {
 196         .hash = address_hash_func,
 197         .compare = address_compare_func
 198 };
 199
 200 bool address_equal(Address *a1, Address *a2) {
 201         if (a1 == a2)
 202                 return true;
 203
 204         if (!a1 || !a2)
 205                 return false;
 206
 207         return address_compare_func(a1, a2) == 0;
 208 }
 209
 210 static int address_establish(Address *address, Link *link) {
 211         bool masq;
 212         int r;
 213
 214         assert(address);
 215         assert(link);
 216
 217         masq = link->network &&
 218                link->network->ip_masquerade &&
 219                address->family == AF_INET &&
 220                address->scope < RT_SCOPE_LINK;
 221
 222         /* Add firewall entry if this is requested */
 223         if (address->ip_masquerade_done != masq) {
 224                 union in_addr_union masked = address->in_addr;
 225                 in_addr_mask(address->family, &masked, address->prefixlen);
 226
 227                 r = fw_add_masquerade(masq, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 228                 if (r < 0)
 229                         log_link_warning_errno(link, r, "Could not enable IP masquerading: %m");
 230
 231                 address->ip_masquerade_done = masq;
 232         }
 233
 234         return 0;
 235 }
 236
 237 static int address_add_internal(Link *link, Set **addresses,
 238                                 int family,
 239                                 const union in_addr_union *in_addr,
 240                                 unsigned char prefixlen,
 241                                 Address **ret) {
 242         _cleanup_(address_freep) Address *address = NULL;
 243         int r;
 244
 245         assert(link);
 246         assert(addresses);
 247         assert(in_addr);
 248
 249         r = address_new(&address);
 250         if (r < 0)
 251                 return r;
 252
 253         address->family = family;
 254         address->in_addr = *in_addr;
 255         address->prefixlen = prefixlen;
 256         /* Consider address tentative until we get the real flags from the kernel */
 257         address->flags = IFA_F_TENTATIVE;
 258
 259         r = set_ensure_allocated(addresses, &address_hash_ops);
 260         if (r < 0)
 261                 return r;
 262
 263         r = set_put(*addresses, address);
 264         if (r < 0)
 265                 return r;
 266
 267         address->link = link;
 268
 269         if (ret)
 270                 *ret = address;
 271
 272         address = NULL;
 273
 274         return 0;
 275 }
 276
 277 int address_add_foreign(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 278         return address_add_internal(link, &link->addresses_foreign, family, in_addr, prefixlen, ret);
 279 }
 280
 281 int address_add(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
 282         Address *address;
 283         int r;
 284
 285         r = address_get(link, family, in_addr, prefixlen, &address);
 286         if (r == -ENOENT) {
 287                 /* Address does not exist, create a new one */
 288                 r = address_add_internal(link, &link->addresses, family, in_addr, prefixlen, &address);
 289                 if (r < 0)
 290                         return r;
 291         } else if (r == 0) {
 292                 /* Take over a foreign address */
 293                 r = set_ensure_allocated(&link->addresses, &address_hash_ops);
 294                 if (r < 0)
 295                         return r;
 296
 297                 r = set_put(link->addresses, address);
 298                 if (r < 0)
 299                         return r;
 300
 301                 set_remove(link->addresses_foreign, address);
 302         } else if (r == 1) {
 303                 /* Already exists, do nothing */
 304                 ;
 305         } else
 306                 return r;
 307
 308         if (ret)
 309                 *ret = address;
 310
 311         return 0;
 312 }
 313
 314 static int address_release(Address *address) {
 315         int r;
 316
 317         assert(address);
 318         assert(address->link);
 319
 320         /* Remove masquerading firewall entry if it was added */
 321         if (address->ip_masquerade_done) {
 322                 union in_addr_union masked = address->in_addr;
 323                 in_addr_mask(address->family, &masked, address->prefixlen);
 324
 325                 r = fw_add_masquerade(false, AF_INET, 0, &masked, address->prefixlen, NULL, NULL, 0);
 326                 if (r < 0)
 327                         log_link_warning_errno(address->link, r, "Failed to disable IP masquerading: %m");
 328
 329                 address->ip_masquerade_done = false;
 330         }
 331
 332         return 0;
 333 }
 334
 335 int address_update(
 336                 Address *address,
 337                 unsigned char flags,
 338                 unsigned char scope,
 339                 const struct ifa_cacheinfo *cinfo) {
 340
 341         bool ready;
 342         int r;
 343
 344         assert(address);
 345         assert(cinfo);
 346         assert_return(address->link, 1);
 347
 348         if (IN_SET(address->link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 349                 return 1;
 350
 351         ready = address_is_ready(address);
 352
 353         address->flags = flags;
 354         address->scope = scope;
 355         address->cinfo = *cinfo;
 356
 357         link_update_operstate(address->link);
 358
 359         if (!ready && address_is_ready(address)) {
 360                 link_check_ready(address->link);
 361
 362                 if (address->family == AF_INET6 &&
 363                     in_addr_is_link_local(AF_INET6, &address->in_addr) > 0 &&
 364                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &address->link->ipv6ll_address) > 0) {
 365
 366                         r = link_ipv6ll_gained(address->link, &address->in_addr.in6);
 367                         if (r < 0)
 368                                 return r;
 369                 }
 370         }
 371
 372         return 0;
 373 }
 374
 375 int address_drop(Address *address) {
 376         Link *link;
 377         bool ready;
 378
 379         assert(address);
 380
 381         ready = address_is_ready(address);
 382         link = address->link;
 383
 384         address_release(address);
 385         address_free(address);
 386
 387         link_update_operstate(link);
 388
 389         if (link && !ready)
 390                 link_check_ready(link);
 391
 392         return 0;
 393 }
 394
 395 int address_get(Link *link,
 396                 int family,
 397                 const union in_addr_union *in_addr,
 398                 unsigned char prefixlen,
 399                 Address **ret) {
 400
 401         Address address, *existing;
 402
 403         assert(link);
 404         assert(in_addr);
 405
 406         address = (Address) {
 407                 .family = family,
 408                 .in_addr = *in_addr,
 409                 .prefixlen = prefixlen,
 410         };
 411
 412         existing = set_get(link->addresses, &address);
 413         if (existing) {
 414                 if (ret)
 415                         *ret = existing;
 416                 return 1;
 417         }
 418
 419         existing = set_get(link->addresses_foreign, &address);
 420         if (existing) {
 421                 if (ret)
 422                         *ret = existing;
 423                 return 0;
 424         }
 425
 426         return -ENOENT;
 427 }
 428
 429 int address_remove(
 430                 Address *address,
 431                 Link *link,
 432                 sd_netlink_message_handler_t callback) {
 433
 434         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 435         int r;
 436
 437         assert(address);
 438         assert(IN_SET(address->family, AF_INET, AF_INET6));
 439         assert(link);
 440         assert(link->ifindex > 0);
 441         assert(link->manager);
 442         assert(link->manager->rtnl);
 443
 444         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_DELADDR,
 445                                      link->ifindex, address->family);
 446         if (r < 0)
 447                 return log_error_errno(r, "Could not allocate RTM_DELADDR message: %m");
 448
 449         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 450         if (r < 0)
 451                 return log_error_errno(r, "Could not set prefixlen: %m");
 452
 453         if (address->family == AF_INET)
 454                 r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
 455         else if (address->family == AF_INET6)
 456                 r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
 457         if (r < 0)
 458                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 459
 460         r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
 461         if (r < 0)
 462                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 463
 464         link_ref(link);
 465
 466         return 0;
 467 }
 468
 469 static int address_acquire(Link *link, Address *original, Address **ret) {
 470         union in_addr_union in_addr = {};
 471         struct in_addr broadcast = {};
 472         _cleanup_(address_freep) Address *na = NULL;
 473         int r;
 474
 475         assert(link);
 476         assert(original);
 477         assert(ret);
 478
 479         /* Something useful was configured? just use it */
 480         if (in_addr_is_null(original->family, &original->in_addr) <= 0)
 481                 return 0;
 482
 483         /* The address is configured to be 0.0.0.0 or [::] by the user?
 484          * Then let's acquire something more useful from the pool. */
 485         r = manager_address_pool_acquire(link->manager, original->family, original->prefixlen, &in_addr);
 486         if (r < 0)
 487                 return log_link_error_errno(link, r, "Failed to acquire address from pool: %m");
 488         if (r == 0) {
 489                 log_link_error(link, "Couldn't find free address for interface, all taken.");
 490                 return -EBUSY;
 491         }
 492
 493         if (original->family == AF_INET) {
 494                 /* Pick first address in range for ourselves ... */
 495                 in_addr.in.s_addr = in_addr.in.s_addr | htobe32(1);
 496
 497                 /* .. and use last as broadcast address */
 498                 if (original->prefixlen > 30)
 499                         broadcast.s_addr = 0;
 500                 else
 501                         broadcast.s_addr = in_addr.in.s_addr | htobe32(0xFFFFFFFFUL >> original->prefixlen);
 502         } else if (original->family == AF_INET6)
 503                 in_addr.in6.s6_addr[15] |= 1;
 504
 505         r = address_new(&na);
 506         if (r < 0)
 507                 return r;
 508
 509         na->family = original->family;
 510         na->prefixlen = original->prefixlen;
 511         na->scope = original->scope;
 512         na->cinfo = original->cinfo;
 513
 514         if (original->label) {
 515                 na->label = strdup(original->label);
 516                 if (!na->label)
 517                         return -ENOMEM;
 518         }
 519
 520         na->broadcast = broadcast;
 521         na->in_addr = in_addr;
 522
 523         LIST_PREPEND(addresses, link->pool_addresses, na);
 524
 525         *ret = TAKE_PTR(na);
 526
 527         return 0;
 528 }
 529
 530 int address_configure(
 531                 Address *address,
 532                 Link *link,
 533                 sd_netlink_message_handler_t callback,
 534                 bool update) {
 535
 536         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 537         int r;
 538
 539         assert(address);
 540         assert(IN_SET(address->family, AF_INET, AF_INET6));
 541         assert(link);
 542         assert(link->ifindex > 0);
 543         assert(link->manager);
 544         assert(link->manager->rtnl);
 545
 546         /* If this is a new address, then refuse adding more than the limit */
 547         if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
 548             set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
 549                 return -E2BIG;
 550
 551         r = address_acquire(link, address, &address);
 552         if (r < 0)
 553                 return r;
 554
 555         if (update)
 556                 r = sd_rtnl_message_new_addr_update(link->manager->rtnl, &req,
 557                                                     link->ifindex, address->family);
 558         else
 559                 r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_NEWADDR,
 560                                              link->ifindex, address->family);
 561         if (r < 0)
 562                 return log_error_errno(r, "Could not allocate RTM_NEWADDR message: %m");
 563
 564         r = sd_rtnl_message_addr_set_prefixlen(req, address->prefixlen);
 565         if (r < 0)
 566                 return log_error_errno(r, "Could not set prefixlen: %m");
 567
 568         address->flags |= IFA_F_PERMANENT;
 569
 570         if (address->home_address)
 571                 address->flags |= IFA_F_HOMEADDRESS;
 572
 573         if (address->duplicate_address_detection)
 574                 address->flags |= IFA_F_NODAD;
 575
 576         if (address->manage_temporary_address)
 577                 address->flags |= IFA_F_MANAGETEMPADDR;
 578
 579         if (address->prefix_route)
 580                 address->flags |= IFA_F_NOPREFIXROUTE;
 581
 582         if (address->autojoin)
 583                 address->flags |= IFA_F_MCAUTOJOIN;
 584
 585         r = sd_rtnl_message_addr_set_flags(req, (address->flags & 0xff));
 586         if (r < 0)
 587                 return log_error_errno(r, "Could not set flags: %m");
 588
 589         if (address->flags & ~0xff) {
 590                 r = sd_netlink_message_append_u32(req, IFA_FLAGS, address->flags);
 591                 if (r < 0)
 592                         return log_error_errno(r, "Could not set extended flags: %m");
 593         }
 594
 595         r = sd_rtnl_message_addr_set_scope(req, address->scope);
 596         if (r < 0)
 597                 return log_error_errno(r, "Could not set scope: %m");
 598
 599         if (address->family == AF_INET)
 600                 r = sd_netlink_message_append_in_addr(req, IFA_LOCAL, &address->in_addr.in);
 601         else if (address->family == AF_INET6)
 602                 r = sd_netlink_message_append_in6_addr(req, IFA_LOCAL, &address->in_addr.in6);
 603         if (r < 0)
 604                 return log_error_errno(r, "Could not append IFA_LOCAL attribute: %m");
 605
 606         if (!in_addr_is_null(address->family, &address->in_addr_peer)) {
 607                 if (address->family == AF_INET)
 608                         r = sd_netlink_message_append_in_addr(req, IFA_ADDRESS, &address->in_addr_peer.in);
 609                 else if (address->family == AF_INET6)
 610                         r = sd_netlink_message_append_in6_addr(req, IFA_ADDRESS, &address->in_addr_peer.in6);
 611                 if (r < 0)
 612                         return log_error_errno(r, "Could not append IFA_ADDRESS attribute: %m");
 613         } else {
 614                 if (address->family == AF_INET) {
 615                         if (address->prefixlen <= 30) {
 616                                 r = sd_netlink_message_append_in_addr(req, IFA_BROADCAST, &address->broadcast);
 617                                 if (r < 0)
 618                                         return log_error_errno(r, "Could not append IFA_BROADCAST attribute: %m");
 619                         }
 620                 }
 621         }
 622
 623         if (address->label) {
 624                 r = sd_netlink_message_append_string(req, IFA_LABEL, address->label);
 625                 if (r < 0)
 626                         return log_error_errno(r, "Could not append IFA_LABEL attribute: %m");
 627         }
 628
 629         r = sd_netlink_message_append_cache_info(req, IFA_CACHEINFO,
 630                                               &address->cinfo);
 631         if (r < 0)
 632                 return log_error_errno(r, "Could not append IFA_CACHEINFO attribute: %m");
 633
 634         r = address_establish(address, link);
 635         if (r < 0)
 636                 return r;
 637
 638         r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
 639         if (r < 0) {
 640                 address_release(address);
 641                 return log_error_errno(r, "Could not send rtnetlink message: %m");
 642         }
 643
 644         link_ref(link);
 645
 646         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
 647         if (r < 0) {
 648                 address_release(address);
 649                 return log_error_errno(r, "Could not add address: %m");
 650         }
 651
 652         return 0;
 653 }
 654
 655 int config_parse_broadcast(
 656                 const char *unit,
 657                 const char *filename,
 658                 unsigned line,
 659                 const char *section,
 660                 unsigned section_line,
 661                 const char *lvalue,
 662                 int ltype,
 663                 const char *rvalue,
 664                 void *data,
 665                 void *userdata) {
 666
 667         Network *network = userdata;
 668         _cleanup_(address_freep) Address *n = NULL;
 669         int r;
 670
 671         assert(filename);
 672         assert(section);
 673         assert(lvalue);
 674         assert(rvalue);
 675         assert(data);
 676
 677         r = address_new_static(network, filename, section_line, &n);
 678         if (r < 0)
 679                 return r;
 680
 681         if (n->family == AF_INET6) {
 682                 log_syntax(unit, LOG_ERR, filename, line, 0, "Broadcast is not valid for IPv6 addresses, ignoring assignment: %s", rvalue);
 683                 return 0;
 684         }
 685
 686         r = in_addr_from_string(AF_INET, rvalue, (union in_addr_union*) &n->broadcast);
 687         if (r < 0) {
 688                 log_syntax(unit, LOG_ERR, filename, line, r, "Broadcast is invalid, ignoring assignment: %s", rvalue);
 689                 return 0;
 690         }
 691
 692         n->family = AF_INET;
 693         n = NULL;
 694
 695         return 0;
 696 }
 697
 698 int config_parse_address(const char *unit,
 699                 const char *filename,
 700                 unsigned line,
 701                 const char *section,
 702                 unsigned section_line,
 703                 const char *lvalue,
 704                 int ltype,
 705                 const char *rvalue,
 706                 void *data,
 707                 void *userdata) {
 708
 709         Network *network = userdata;
 710         _cleanup_(address_freep) Address *n = NULL;
 711         const char *address, *e;
 712         union in_addr_union buffer;
 713         int r, f;
 714
 715         assert(filename);
 716         assert(section);
 717         assert(lvalue);
 718         assert(rvalue);
 719         assert(data);
 720
 721         if (streq(section, "Network")) {
 722                 /* we are not in an Address section, so treat
 723                  * this as the special '0' section */
 724                 r = address_new_static(network, NULL, 0, &n);
 725         } else
 726                 r = address_new_static(network, filename, section_line, &n);
 727
 728         if (r < 0)
 729                 return r;
 730
 731         /* Address=address/prefixlen */
 732
 733         /* prefixlen */
 734         e = strchr(rvalue, '/');
 735         if (e) {
 736                 unsigned i;
 737
 738                 r = safe_atou(e + 1, &i);
 739                 if (r < 0) {
 740                         log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length is invalid, ignoring assignment: %s", e + 1);
 741                         return 0;
 742                 }
 743
 744                 n->prefixlen = (unsigned char) i;
 745
 746                 address = strndupa(rvalue, e - rvalue);
 747         } else
 748                 address = rvalue;
 749
 750         r = in_addr_from_string_auto(address, &f, &buffer);
 751         if (r < 0) {
 752                 log_syntax(unit, LOG_ERR, filename, line, r, "Address is invalid, ignoring assignment: %s", address);
 753                 return 0;
 754         }
 755
 756         if (!e && f == AF_INET) {
 757                 r = in4_addr_default_prefixlen(&buffer.in, &n->prefixlen);
 758                 if (r < 0) {
 759                         log_syntax(unit, LOG_ERR, filename, line, r, "Prefix length not specified, and a default one cannot be deduced for '%s', ignoring assignment", address);
 760                         return 0;
 761                 }
 762         }
 763
 764         if (n->family != AF_UNSPEC && f != n->family) {
 765                 log_syntax(unit, LOG_ERR, filename, line, 0, "Address is incompatible, ignoring assignment: %s", address);
 766                 return 0;
 767         }
 768
 769         n->family = f;
 770
 771         if (streq(lvalue, "Address"))
 772                 n->in_addr = buffer;
 773         else
 774                 n->in_addr_peer = buffer;
 775
 776         if (n->family == AF_INET && n->broadcast.s_addr == 0)
 777                 n->broadcast.s_addr = n->in_addr.in.s_addr | htonl(0xfffffffflu >> n->prefixlen);
 778
 779         n = NULL;
 780
 781         return 0;
 782 }
 783
 784 int config_parse_label(
 785                 const char *unit,
 786                 const char *filename,
 787                 unsigned line,
 788                 const char *section,
 789                 unsigned section_line,
 790                 const char *lvalue,
 791                 int ltype,
 792                 const char *rvalue,
 793                 void *data,
 794                 void *userdata) {
 795
 796         _cleanup_(address_freep) Address *n = NULL;
 797         Network *network = userdata;
 798         int r;
 799
 800         assert(filename);
 801         assert(section);
 802         assert(lvalue);
 803         assert(rvalue);
 804         assert(data);
 805
 806         r = address_new_static(network, filename, section_line, &n);
 807         if (r < 0)
 808                 return r;
 809
 810         if (!address_label_valid(rvalue)) {
 811                 log_syntax(unit, LOG_ERR, filename, line, 0, "Interface label is too long or invalid, ignoring assignment: %s", rvalue);
 812                 return 0;
 813         }
 814
 815         r = free_and_strdup(&n->label, rvalue);
 816         if (r < 0)
 817                 return log_oom();
 818
 819         n = NULL;
 820
 821         return 0;
 822 }
 823
 824 int config_parse_lifetime(const char *unit,
 825                           const char *filename,
 826                           unsigned line,
 827                           const char *section,
 828                           unsigned section_line,
 829                           const char *lvalue,
 830                           int ltype,
 831                           const char *rvalue,
 832                           void *data,
 833                           void *userdata) {
 834         Network *network = userdata;
 835         _cleanup_(address_freep) Address *n = NULL;
 836         unsigned k;
 837         int r;
 838
 839         assert(filename);
 840         assert(section);
 841         assert(lvalue);
 842         assert(rvalue);
 843         assert(data);
 844
 845         r = address_new_static(network, filename, section_line, &n);
 846         if (r < 0)
 847                 return r;
 848
 849         if (STR_IN_SET(rvalue, "forever", "infinity")) {
 850                 n->cinfo.ifa_prefered = CACHE_INFO_INFINITY_LIFE_TIME;
 851                 n = NULL;
 852
 853                 return 0;
 854         }
 855
 856         r = safe_atou(rvalue, &k);
 857         if (r < 0) {
 858                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse PreferredLifetime, ignoring: %s", rvalue);
 859                 return 0;
 860         }
 861
 862         if (k != 0)
 863                 log_syntax(unit, LOG_ERR, filename, line, 0, "Invalid PreferredLifetime value, ignoring: %d", k);
 864         else {
 865                 n->cinfo.ifa_prefered = k;
 866                 n = NULL;
 867         }
 868
 869         return 0;
 870 }
 871
 872 int config_parse_address_flags(const char *unit,
 873                                const char *filename,
 874                                unsigned line,
 875                                const char *section,
 876                                unsigned section_line,
 877                                const char *lvalue,
 878                                int ltype,
 879                                const char *rvalue,
 880                                void *data,
 881                                void *userdata) {
 882         Network *network = userdata;
 883         _cleanup_(address_freep) Address *n = NULL;
 884         int r;
 885
 886         assert(filename);
 887         assert(section);
 888         assert(lvalue);
 889         assert(rvalue);
 890         assert(data);
 891
 892         r = address_new_static(network, filename, section_line, &n);
 893         if (r < 0)
 894                 return r;
 895
 896         r = parse_boolean(rvalue);
 897         if (r < 0) {
 898                 log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse address flag, ignoring: %s", rvalue);
 899                 return 0;
 900         }
 901
 902         if (streq(lvalue, "HomeAddress"))
 903                 n->home_address = r;
 904         else if (streq(lvalue, "DuplicateAddressDetection"))
 905                 n->duplicate_address_detection = r;
 906         else if (streq(lvalue, "ManageTemporaryAddress"))
 907                 n->manage_temporary_address = r;
 908         else if (streq(lvalue, "PrefixRoute"))
 909                 n->prefix_route = r;
 910         else if (streq(lvalue, "AutoJoin"))
 911                 n->autojoin = r;
 912
 913         return 0;
 914 }
 915
 916 int config_parse_address_scope(const char *unit,
 917                                const char *filename,
 918                                unsigned line,
 919                                const char *section,
 920                                unsigned section_line,
 921                                const char *lvalue,
 922                                int ltype,
 923                                const char *rvalue,
 924                                void *data,
 925                                void *userdata) {
 926         Network *network = userdata;
 927         _cleanup_(address_freep) Address *n = NULL;
 928         int r;
 929
 930         assert(filename);
 931         assert(section);
 932         assert(lvalue);
 933         assert(rvalue);
 934         assert(data);
 935
 936         r = address_new_static(network, filename, section_line, &n);
 937         if (r < 0)
 938                 return r;
 939
 940         if (streq(rvalue, "host"))
 941                 n->scope = RT_SCOPE_HOST;
 942         else if (streq(rvalue, "link"))
 943                 n->scope = RT_SCOPE_LINK;
 944         else if (streq(rvalue, "global"))
 945                 n->scope = RT_SCOPE_UNIVERSE;
 946         else {
 947                 r = safe_atou8(rvalue , &n->scope);
 948                 if (r < 0) {
 949                         log_syntax(unit, LOG_ERR, filename, line, r, "Could not parse address scope \"%s\", ignoring assignment: %m", rvalue);
 950                         return 0;
 951                 }
 952         }
 953
 954         n = NULL;
 955
 956         return 0;
 957 }
 958
 959 bool address_is_ready(const Address *a) {
 960         assert(a);
 961
 962         if (a->family == AF_INET6)
 963                 return !(a->flags & IFA_F_TENTATIVE);
 964         else
 965                 return !(a->flags & (IFA_F_TENTATIVE | IFA_F_DEPRECATED));
 966 }