src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5 #include <unistd.h>
   6
   7 #include "alloc-util.h"
   8 #include "bus-util.h"
   9 #include "dhcp-identifier.h"
  10 #include "dhcp-lease-internal.h"
  11 #include "env-file.h"
  12 #include "fd-util.h"
  13 #include "fileio.h"
  14 #include "missing_network.h"
  15 #include "netdev/bond.h"
  16 #include "netdev/bridge.h"
  17 #include "netdev/ipvlan.h"
  18 #include "netdev/vrf.h"
  19 #include "netlink-util.h"
  20 #include "network-internal.h"
  21 #include "networkd-can.h"
  22 #include "networkd-ipv6-proxy-ndp.h"
  23 #include "networkd-lldp-tx.h"
  24 #include "networkd-manager.h"
  25 #include "networkd-ndisc.h"
  26 #include "networkd-neighbor.h"
  27 #include "networkd-radv.h"
  28 #include "networkd-routing-policy-rule.h"
  29 #include "set.h"
  30 #include "socket-util.h"
  31 #include "stdio-util.h"
  32 #include "string-table.h"
  33 #include "strv.h"
  34 #include "sysctl-util.h"
  35 #include "tmpfile-util.h"
  36 #include "udev-util.h"
  37 #include "util.h"
  38 #include "virt.h"
  39
  40 uint32_t link_get_vrf_table(Link *link) {
  41         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  42 }
  43
  44 uint32_t link_get_dhcp_route_table(Link *link) {
  45         /* When the interface is part of an VRF use the VRFs routing table, unless
  46          * another table is explicitly specified. */
  47         if (link->network->dhcp_route_table_set)
  48                 return link->network->dhcp_route_table;
  49         return link_get_vrf_table(link);
  50 }
  51
  52 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  53         if (link->network->ipv6_accept_ra_route_table_set)
  54                 return link->network->ipv6_accept_ra_route_table;
  55         return link_get_vrf_table(link);
  56 }
  57
  58 DUID* link_get_duid(Link *link) {
  59         if (link->network->duid.type != _DUID_TYPE_INVALID)
  60                 return &link->network->duid;
  61         else
  62                 return &link->manager->duid;
  63 }
  64
  65 int link_sysctl_ipv6_enabled(Link *link) {
  66         _cleanup_free_ char *value = NULL;
  67         int r;
  68
  69         r = sysctl_read_ip_property(AF_INET6, link->ifname, "disable_ipv6", &value);
  70         if (r < 0)
  71                 return log_link_warning_errno(link, r,
  72                                               "Failed to read net.ipv6.conf.%s.disable_ipv6 sysctl property: %m",
  73                                               link->ifname);
  74
  75         link->sysctl_ipv6_enabled = value[0] == '0';
  76         return link->sysctl_ipv6_enabled;
  77 }
  78
  79 static bool link_dhcp6_enabled(Link *link) {
  80         assert(link);
  81
  82         if (!socket_ipv6_is_supported())
  83                 return false;
  84
  85         if (link->flags & IFF_LOOPBACK)
  86                 return false;
  87
  88         if (!link->network)
  89                 return false;
  90
  91         if (link->network->bond)
  92                 return false;
  93
  94         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
  95                 return false;
  96
  97         if (link_sysctl_ipv6_enabled(link) == 0)
  98                 return false;
  99
 100         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
 101 }
 102
 103 static bool link_dhcp4_enabled(Link *link) {
 104         assert(link);
 105
 106         if (link->flags & IFF_LOOPBACK)
 107                 return false;
 108
 109         if (!link->network)
 110                 return false;
 111
 112         if (link->network->bond)
 113                 return false;
 114
 115         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
 116                 return false;
 117
 118         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 119 }
 120
 121 static bool link_dhcp4_server_enabled(Link *link) {
 122         assert(link);
 123
 124         if (link->flags & IFF_LOOPBACK)
 125                 return false;
 126
 127         if (!link->network)
 128                 return false;
 129
 130         if (link->network->bond)
 131                 return false;
 132
 133         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
 134                 return false;
 135
 136         return link->network->dhcp_server;
 137 }
 138
 139 bool link_ipv4ll_enabled(Link *link, AddressFamilyBoolean mask) {
 140         assert(link);
 141         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 142
 143         if (link->flags & IFF_LOOPBACK)
 144                 return false;
 145
 146         if (!link->network)
 147                 return false;
 148
 149         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "ip6gre", "ip6tnl", "sit", "vti", "vti6", "can", "vcan", "vxcan", "nlmon"))
 150                 return false;
 151
 152         /* L3 or L3S mode do not support ARP. */
 153         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 154                 return false;
 155
 156         if (link->network->bond)
 157                 return false;
 158
 159         if (link->network->bond)
 160                 return false;
 161
 162         return link->network->link_local & mask;
 163 }
 164
 165 static bool link_ipv6ll_enabled(Link *link) {
 166         assert(link);
 167
 168         if (!socket_ipv6_is_supported())
 169                 return false;
 170
 171         if (link->flags & IFF_LOOPBACK)
 172                 return false;
 173
 174         if (!link->network)
 175                 return false;
 176
 177         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "can", "vcan", "vxcan", "nlmon"))
 178                 return false;
 179
 180         if (link->network->bond)
 181                 return false;
 182
 183         if (link_sysctl_ipv6_enabled(link) == 0)
 184                 return false;
 185
 186         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 187 }
 188
 189 static bool link_ipv6_enabled(Link *link) {
 190         assert(link);
 191
 192         if (!socket_ipv6_is_supported())
 193                 return false;
 194
 195         if (link->network->bond)
 196                 return false;
 197
 198         if (link_sysctl_ipv6_enabled(link) == 0)
 199                 return false;
 200
 201         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
 202                 return false;
 203
 204         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 205         return link_ipv6ll_enabled(link) || network_has_static_ipv6_addresses(link->network);
 206 }
 207
 208 static bool link_radv_enabled(Link *link) {
 209         assert(link);
 210
 211         if (!link_ipv6ll_enabled(link))
 212                 return false;
 213
 214         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 215 }
 216
 217 static bool link_ipv4_forward_enabled(Link *link) {
 218         assert(link);
 219
 220         if (link->flags & IFF_LOOPBACK)
 221                 return false;
 222
 223         if (!link->network)
 224                 return false;
 225
 226         if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
 227                 return false;
 228
 229         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 230 }
 231
 232 static bool link_ipv6_forward_enabled(Link *link) {
 233         assert(link);
 234
 235         if (!socket_ipv6_is_supported())
 236                 return false;
 237
 238         if (link->flags & IFF_LOOPBACK)
 239                 return false;
 240
 241         if (!link->network)
 242                 return false;
 243
 244         if (link->network->ip_forward == _ADDRESS_FAMILY_BOOLEAN_INVALID)
 245                 return false;
 246
 247         if (link_sysctl_ipv6_enabled(link) == 0)
 248                 return false;
 249
 250         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 251 }
 252
 253 static bool link_proxy_arp_enabled(Link *link) {
 254         assert(link);
 255
 256         if (link->flags & IFF_LOOPBACK)
 257                 return false;
 258
 259         if (!link->network)
 260                 return false;
 261
 262         if (link->network->proxy_arp < 0)
 263                 return false;
 264
 265         return true;
 266 }
 267
 268 static bool link_ipv6_accept_ra_enabled(Link *link) {
 269         assert(link);
 270
 271         if (!socket_ipv6_is_supported())
 272                 return false;
 273
 274         if (link->flags & IFF_LOOPBACK)
 275                 return false;
 276
 277         if (!link->network)
 278                 return false;
 279
 280         if (!link_ipv6ll_enabled(link))
 281                 return false;
 282
 283         /* If unset use system default (enabled if local forwarding is disabled.
 284          * disabled if local forwarding is enabled).
 285          * If set, ignore or enforce RA independent of local forwarding state.
 286          */
 287         if (link->network->ipv6_accept_ra < 0)
 288                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 289                 return !link_ipv6_forward_enabled(link);
 290         else if (link->network->ipv6_accept_ra > 0)
 291                 /* accept RA even if ip_forward is enabled */
 292                 return true;
 293         else
 294                 /* ignore RA */
 295                 return false;
 296 }
 297
 298 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 299         assert(link);
 300
 301         if (!socket_ipv6_is_supported())
 302                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 303
 304         if (link->flags & IFF_LOOPBACK)
 305                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 306
 307         if (!link->network)
 308                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 309
 310         return link->network->ipv6_privacy_extensions;
 311 }
 312
 313 static int link_enable_ipv6(Link *link) {
 314         bool disabled;
 315         int r;
 316
 317         if (link->flags & IFF_LOOPBACK)
 318                 return 0;
 319
 320         disabled = !link_ipv6_enabled(link);
 321
 322         r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", disabled);
 323         if (r < 0)
 324                 log_link_warning_errno(link, r, "Cannot %s IPv6: %m", enable_disable(!disabled));
 325         else
 326                 log_link_info(link, "IPv6 successfully %sd", enable_disable(!disabled));
 327
 328         return 0;
 329 }
 330
 331 static bool link_is_enslaved(Link *link) {
 332         if (link->flags & IFF_SLAVE)
 333                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 334                 return true;
 335
 336         if (!link->network)
 337                 return false;
 338
 339         if (link->master_ifindex > 0 && link->network->bridge)
 340                 return true;
 341
 342         /* TODO: add conditions for other netdevs. */
 343
 344         return false;
 345 }
 346
 347 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 348         Link *master;
 349
 350         if (!netdev)
 351                 return;
 352
 353         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 354                 return;
 355
 356         link_update_operstate(master, true);
 357 }
 358
 359 void link_update_operstate(Link *link, bool also_update_master) {
 360         LinkOperationalState operstate;
 361         Iterator i;
 362
 363         assert(link);
 364
 365         if (link->kernel_operstate == IF_OPER_DORMANT)
 366                 operstate = LINK_OPERSTATE_DORMANT;
 367         else if (link_has_carrier(link)) {
 368                 Address *address;
 369                 uint8_t scope = RT_SCOPE_NOWHERE;
 370
 371                 /* if we have carrier, check what addresses we have */
 372                 SET_FOREACH(address, link->addresses, i) {
 373                         if (!address_is_ready(address))
 374                                 continue;
 375
 376                         if (address->scope < scope)
 377                                 scope = address->scope;
 378                 }
 379
 380                 /* for operstate we also take foreign addresses into account */
 381                 SET_FOREACH(address, link->addresses_foreign, i) {
 382                         if (!address_is_ready(address))
 383                                 continue;
 384
 385                         if (address->scope < scope)
 386                                 scope = address->scope;
 387                 }
 388
 389                 if (scope < RT_SCOPE_SITE)
 390                         /* universally accessible addresses found */
 391                         operstate = LINK_OPERSTATE_ROUTABLE;
 392                 else if (scope < RT_SCOPE_HOST)
 393                         /* only link or site local addresses found */
 394                         operstate = LINK_OPERSTATE_DEGRADED;
 395                 else
 396                         /* no useful addresses found */
 397                         operstate = LINK_OPERSTATE_CARRIER;
 398         } else if (link->flags & IFF_UP)
 399                 operstate = LINK_OPERSTATE_NO_CARRIER;
 400         else
 401                 operstate = LINK_OPERSTATE_OFF;
 402
 403         if (IN_SET(operstate, LINK_OPERSTATE_DEGRADED, LINK_OPERSTATE_CARRIER) &&
 404             link_is_enslaved(link))
 405                 operstate = LINK_OPERSTATE_ENSLAVED;
 406
 407         if (operstate >= LINK_OPERSTATE_CARRIER) {
 408                 Link *slave;
 409
 410                 SET_FOREACH(slave, link->slaves, i) {
 411                         link_update_operstate(slave, false);
 412
 413                         if (slave->operstate < LINK_OPERSTATE_CARRIER)
 414                                 operstate = LINK_OPERSTATE_DEGRADED_CARRIER;
 415                 }
 416         }
 417
 418         if (link->operstate != operstate) {
 419                 link->operstate = operstate;
 420                 link_send_changed(link, "OperationalState", NULL);
 421                 link_dirty(link);
 422         }
 423
 424         if (also_update_master && link->network) {
 425                 link_update_master_operstate(link, link->network->bond);
 426                 link_update_master_operstate(link, link->network->bridge);
 427         }
 428 }
 429
 430 #define FLAG_STRING(string, flag, old, new) \
 431         (((old ^ new) & flag) \
 432                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 433                 : "")
 434
 435 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 436         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 437         uint8_t operstate;
 438         int r;
 439
 440         assert(link);
 441
 442         r = sd_rtnl_message_link_get_flags(m, &flags);
 443         if (r < 0)
 444                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 445
 446         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 447         if (r < 0)
 448                 /* if we got a message without operstate, take it to mean
 449                    the state was unchanged */
 450                 operstate = link->kernel_operstate;
 451
 452         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 453                 return 0;
 454
 455         if (link->flags != flags) {
 456                 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
 457                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 458                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 459                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 460                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 461                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 462                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 463                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 464                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 465                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 466                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 467                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 468                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 469                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 470                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 471                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 472                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 473                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 474                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 475                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 476
 477                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 478                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 479                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 480                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 481                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 482                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 483                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 484                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 485
 486                 /* link flags are currently at most 18 bits, let's align to
 487                  * printing 20 */
 488                 if (unknown_flags_added)
 489                         log_link_debug(link,
 490                                        "Unknown link flags gained: %#.5x (ignoring)",
 491                                        unknown_flags_added);
 492
 493                 if (unknown_flags_removed)
 494                         log_link_debug(link,
 495                                        "Unknown link flags lost: %#.5x (ignoring)",
 496                                        unknown_flags_removed);
 497         }
 498
 499         link->flags = flags;
 500         link->kernel_operstate = operstate;
 501
 502         link_update_operstate(link, true);
 503
 504         return 0;
 505 }
 506
 507 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 508         _cleanup_(link_unrefp) Link *link = NULL;
 509         uint16_t type;
 510         const char *ifname, *kind = NULL;
 511         int r, ifindex;
 512         unsigned short iftype;
 513
 514         assert(manager);
 515         assert(message);
 516         assert(ret);
 517
 518         /* check for link kind */
 519         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 520         if (r == 0) {
 521                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 522                 r = sd_netlink_message_exit_container(message);
 523                 if (r < 0)
 524                         return r;
 525         }
 526
 527         r = sd_netlink_message_get_type(message, &type);
 528         if (r < 0)
 529                 return r;
 530         else if (type != RTM_NEWLINK)
 531                 return -EINVAL;
 532
 533         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 534         if (r < 0)
 535                 return r;
 536         else if (ifindex <= 0)
 537                 return -EINVAL;
 538
 539         r = sd_rtnl_message_link_get_type(message, &iftype);
 540         if (r < 0)
 541                 return r;
 542
 543         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 544         if (r < 0)
 545                 return r;
 546
 547         link = new(Link, 1);
 548         if (!link)
 549                 return -ENOMEM;
 550
 551         *link = (Link) {
 552                 .n_ref = 1,
 553                 .manager = manager,
 554                 .state = LINK_STATE_PENDING,
 555                 .rtnl_extended_attrs = true,
 556                 .ifindex = ifindex,
 557                 .iftype = iftype,
 558                 .sysctl_ipv6_enabled = -1,
 559         };
 560
 561         link->ifname = strdup(ifname);
 562         if (!link->ifname)
 563                 return -ENOMEM;
 564
 565         if (kind) {
 566                 link->kind = strdup(kind);
 567                 if (!link->kind)
 568                         return -ENOMEM;
 569         }
 570
 571         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 572         if (r < 0)
 573                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 574
 575         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 576         if (r < 0)
 577                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 578
 579         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 580                 return -ENOMEM;
 581
 582         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 583                 return -ENOMEM;
 584
 585         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 586                 return -ENOMEM;
 587
 588         r = hashmap_ensure_allocated(&manager->links, NULL);
 589         if (r < 0)
 590                 return r;
 591
 592         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 593         if (r < 0)
 594                 return r;
 595
 596         r = link_update_flags(link, message, false);
 597         if (r < 0)
 598                 return r;
 599
 600         *ret = TAKE_PTR(link);
 601
 602         return 0;
 603 }
 604
 605 static Link *link_free(Link *link) {
 606         Address *address;
 607
 608         assert(link);
 609
 610         link->routes = set_free_with_destructor(link->routes, route_free);
 611         link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
 612
 613         link->addresses = set_free_with_destructor(link->addresses, address_free);
 614         link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
 615
 616         while ((address = link->pool_addresses)) {
 617                 LIST_REMOVE(addresses, link->pool_addresses, address);
 618                 address_free(address);
 619         }
 620
 621         sd_dhcp_server_unref(link->dhcp_server);
 622         sd_dhcp_client_unref(link->dhcp_client);
 623         sd_dhcp_lease_unref(link->dhcp_lease);
 624
 625         link_lldp_emit_stop(link);
 626
 627         free(link->lease_file);
 628
 629         sd_lldp_unref(link->lldp);
 630         free(link->lldp_file);
 631
 632         ndisc_flush(link);
 633
 634         sd_ipv4ll_unref(link->ipv4ll);
 635         sd_dhcp6_client_unref(link->dhcp6_client);
 636         sd_ndisc_unref(link->ndisc);
 637         sd_radv_unref(link->radv);
 638
 639         free(link->ifname);
 640         free(link->kind);
 641
 642         (void) unlink(link->state_file);
 643         free(link->state_file);
 644
 645         sd_device_unref(link->sd_device);
 646
 647         hashmap_free(link->bound_to_links);
 648         hashmap_free(link->bound_by_links);
 649
 650         set_free_with_destructor(link->slaves, link_unref);
 651
 652         network_unref(link->network);
 653
 654         return mfree(link);
 655 }
 656
 657 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 658
 659 int link_get(Manager *m, int ifindex, Link **ret) {
 660         Link *link;
 661
 662         assert(m);
 663         assert(ifindex);
 664         assert(ret);
 665
 666         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 667         if (!link)
 668                 return -ENODEV;
 669
 670         *ret = link;
 671
 672         return 0;
 673 }
 674
 675 void link_set_state(Link *link, LinkState state) {
 676         assert(link);
 677
 678         if (link->state == state)
 679                 return;
 680
 681         log_link_debug(link, "State changed: %s -> %s",
 682                        link_state_to_string(link->state),
 683                        link_state_to_string(state));
 684
 685         link->state = state;
 686
 687         link_send_changed(link, "AdministrativeState", NULL);
 688 }
 689
 690 static void link_enter_unmanaged(Link *link) {
 691         assert(link);
 692
 693         link_set_state(link, LINK_STATE_UNMANAGED);
 694
 695         link_dirty(link);
 696 }
 697
 698 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 699         int r = 0, k;
 700
 701         assert(link);
 702         assert(link->manager);
 703         assert(link->manager->event);
 704
 705         dhcp4_release_old_lease(link);
 706
 707         if (link->dhcp_client && (!may_keep_dhcp || !link->network ||
 708                                   !FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP))) {
 709                 k = sd_dhcp_client_stop(link->dhcp_client);
 710                 if (k < 0)
 711                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 712         }
 713
 714         if (link->ipv4ll) {
 715                 k = sd_ipv4ll_stop(link->ipv4ll);
 716                 if (k < 0)
 717                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 718         }
 719
 720         if (link->dhcp6_client) {
 721                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 722                 if (k < 0)
 723                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 724         }
 725
 726         if (link->ndisc) {
 727                 k = sd_ndisc_stop(link->ndisc);
 728                 if (k < 0)
 729                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 730         }
 731
 732         if (link->radv) {
 733                 k = sd_radv_stop(link->radv);
 734                 if (k < 0)
 735                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 736         }
 737
 738         link_lldp_emit_stop(link);
 739         return r;
 740 }
 741
 742 void link_enter_failed(Link *link) {
 743         assert(link);
 744
 745         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 746                 return;
 747
 748         log_link_warning(link, "Failed");
 749
 750         link_set_state(link, LINK_STATE_FAILED);
 751
 752         link_stop_clients(link, false);
 753
 754         link_dirty(link);
 755 }
 756
 757 static Address* link_find_dhcp_server_address(Link *link) {
 758         Address *address;
 759
 760         assert(link);
 761         assert(link->network);
 762
 763         /* The first statically configured address if there is any */
 764         LIST_FOREACH(addresses, address, link->network->static_addresses) {
 765
 766                 if (address->family != AF_INET)
 767                         continue;
 768
 769                 if (in_addr_is_null(address->family, &address->in_addr))
 770                         continue;
 771
 772                 return address;
 773         }
 774
 775         /* If that didn't work, find a suitable address we got from the pool */
 776         LIST_FOREACH(addresses, address, link->pool_addresses) {
 777                 if (address->family != AF_INET)
 778                         continue;
 779
 780                 return address;
 781         }
 782
 783         return NULL;
 784 }
 785
 786 static int link_join_netdevs_after_configured(Link *link) {
 787         NetDev *netdev;
 788         Iterator i;
 789         int r;
 790
 791         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 792                 if (netdev->ifindex > 0)
 793                         /* Assume already enslaved. */
 794                         continue;
 795
 796                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 797                         continue;
 798
 799                 log_struct(LOG_DEBUG,
 800                            LOG_LINK_INTERFACE(link),
 801                            LOG_NETDEV_INTERFACE(netdev),
 802                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 803
 804                 r = netdev_join(netdev, link, NULL);
 805                 if (r < 0)
 806                         return log_struct_errno(LOG_WARNING, r,
 807                                                 LOG_LINK_INTERFACE(link),
 808                                                 LOG_NETDEV_INTERFACE(netdev),
 809                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 810         }
 811
 812         return 0;
 813 }
 814
 815 static void link_enter_configured(Link *link) {
 816         assert(link);
 817         assert(link->network);
 818
 819         if (link->state != LINK_STATE_CONFIGURING)
 820                 return;
 821
 822         log_link_info(link, "Configured");
 823
 824         link_set_state(link, LINK_STATE_CONFIGURED);
 825
 826         (void) link_join_netdevs_after_configured(link);
 827
 828         link_dirty(link);
 829 }
 830
 831 static int link_request_set_routing_policy_rule(Link *link) {
 832         RoutingPolicyRule *rule, *rrule = NULL;
 833         int r;
 834
 835         assert(link);
 836         assert(link->network);
 837
 838         link_set_state(link, LINK_STATE_CONFIGURING);
 839         link->routing_policy_rules_configured = false;
 840
 841         LIST_FOREACH(rules, rule, link->network->rules) {
 842                 r = routing_policy_rule_get(link->manager, rule->family, &rule->from, rule->from_prefixlen, &rule->to,
 843                                             rule->to_prefixlen, rule->tos, rule->fwmark, rule->table, rule->iif, rule->oif,
 844                                             rule->protocol, &rule->sport, &rule->dport, &rrule);
 845                 if (r == 0) {
 846                         (void) routing_policy_rule_make_local(link->manager, rrule);
 847                         continue;
 848                 }
 849
 850                 r = routing_policy_rule_configure(rule, link, NULL);
 851                 if (r < 0) {
 852                         log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 853                         link_enter_failed(link);
 854                         return r;
 855                 }
 856                 if (r > 0)
 857                         link->routing_policy_rule_messages++;
 858         }
 859
 860         routing_policy_rule_purge(link->manager, link);
 861         if (link->routing_policy_rule_messages == 0) {
 862                 link->routing_policy_rules_configured = true;
 863                 link_check_ready(link);
 864         } else
 865                 log_link_debug(link, "Setting routing policy rules");
 866
 867         return 0;
 868 }
 869
 870 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 871         int r;
 872
 873         assert(link);
 874         assert(link->route_messages > 0);
 875         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 876                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 877
 878         link->route_messages--;
 879
 880         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 881                 return 1;
 882
 883         r = sd_netlink_message_get_errno(m);
 884         if (r < 0 && r != -EEXIST)
 885                 log_link_warning_errno(link, r, "Could not set route: %m");
 886
 887         if (link->route_messages == 0) {
 888                 log_link_debug(link, "Routes set");
 889                 link->static_routes_configured = true;
 890                 link_check_ready(link);
 891         }
 892
 893         return 1;
 894 }
 895
 896 int link_request_set_routes(Link *link) {
 897         enum {
 898                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
 899                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
 900                 _PHASE_MAX
 901         } phase;
 902         Route *rt;
 903         int r;
 904
 905         assert(link);
 906         assert(link->network);
 907         assert(link->addresses_configured);
 908         assert(link->address_messages == 0);
 909         assert(link->state != _LINK_STATE_INVALID);
 910
 911         link_set_state(link, LINK_STATE_CONFIGURING);
 912         link->static_routes_configured = false;
 913
 914         r = link_request_set_routing_policy_rule(link);
 915         if (r < 0)
 916                 return r;
 917
 918         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
 919         for (phase = 0; phase < _PHASE_MAX; phase++)
 920                 LIST_FOREACH(routes, rt, link->network->static_routes) {
 921
 922                         if (in_addr_is_null(rt->family, &rt->gw) != (phase == PHASE_NON_GATEWAY))
 923                                 continue;
 924
 925                         r = route_configure(rt, link, route_handler);
 926                         if (r < 0) {
 927                                 log_link_warning_errno(link, r, "Could not set routes: %m");
 928                                 link_enter_failed(link);
 929                                 return r;
 930                         }
 931                         if (r > 0)
 932                                 link->route_messages++;
 933                 }
 934
 935         if (link->route_messages == 0) {
 936                 link->static_routes_configured = true;
 937                 link_check_ready(link);
 938         } else
 939                 log_link_debug(link, "Setting routes");
 940
 941         return 0;
 942 }
 943
 944 void link_check_ready(Link *link) {
 945         Address *a;
 946         Iterator i;
 947
 948         assert(link);
 949
 950         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 951                 return;
 952
 953         if (!link->network)
 954                 return;
 955
 956         if (!link->addresses_configured)
 957                 return;
 958
 959         if (!link->neighbors_configured)
 960                 return;
 961
 962         SET_FOREACH(a, link->addresses, i)
 963                 if (!address_is_ready(a))
 964                         return;
 965
 966         if (!link->addresses_ready) {
 967                 link->addresses_ready = true;
 968                 link_request_set_routes(link);
 969                 return;
 970         }
 971
 972         if (!link->static_routes_configured)
 973                 return;
 974
 975         if (!link->routing_policy_rules_configured)
 976                 return;
 977
 978         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
 979
 980                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !(link->ipv4ll_address && link->ipv4ll_route))
 981                         return;
 982
 983                 if (link_ipv6ll_enabled(link) &&
 984                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
 985                         return;
 986
 987                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
 988                     !link->dhcp4_configured &&
 989                     !link->dhcp6_configured &&
 990                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address && link->ipv4ll_route))
 991                         /* When DHCP is enabled, at least one protocol must provide an address, or
 992                          * an IPv4ll fallback address must be configured. */
 993                         return;
 994
 995                 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
 996                         return;
 997         }
 998
 999         if (link->state != LINK_STATE_CONFIGURED)
1000                 link_enter_configured(link);
1001
1002         return;
1003 }
1004
1005 static int link_request_set_neighbors(Link *link) {
1006         Neighbor *neighbor;
1007         int r;
1008
1009         assert(link);
1010         assert(link->network);
1011         assert(link->state != _LINK_STATE_INVALID);
1012
1013         link_set_state(link, LINK_STATE_CONFIGURING);
1014         link->neighbors_configured = false;
1015
1016         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1017                 r = neighbor_configure(neighbor, link, NULL);
1018                 if (r < 0) {
1019                         log_link_warning_errno(link, r, "Could not set neighbor: %m");
1020                         link_enter_failed(link);
1021                         return r;
1022                 }
1023         }
1024
1025         if (link->neighbor_messages == 0) {
1026                 link->neighbors_configured = true;
1027                 link_check_ready(link);
1028         } else
1029                 log_link_debug(link, "Setting neighbors");
1030
1031         return 0;
1032 }
1033
1034 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1035         int r;
1036
1037         assert(rtnl);
1038         assert(m);
1039         assert(link);
1040         assert(link->ifname);
1041         assert(link->address_messages > 0);
1042         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1043                LINK_STATE_FAILED, LINK_STATE_LINGER));
1044
1045         link->address_messages--;
1046
1047         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1048                 return 1;
1049
1050         r = sd_netlink_message_get_errno(m);
1051         if (r < 0 && r != -EEXIST)
1052                 log_link_warning_errno(link, r, "could not set address: %m");
1053         else if (r >= 0)
1054                 manager_rtnl_process_address(rtnl, m, link->manager);
1055
1056         if (link->address_messages == 0) {
1057                 log_link_debug(link, "Addresses set");
1058                 link->addresses_configured = true;
1059                 link_check_ready(link);
1060         }
1061
1062         return 1;
1063 }
1064
1065 static int link_push_uplink_dns_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1066         _cleanup_free_ struct in_addr *addresses = NULL;
1067         size_t n_addresses = 0, n_allocated = 0;
1068         unsigned i;
1069
1070         log_debug("Copying DNS server information from %s", link->ifname);
1071
1072         if (!link->network)
1073                 return 0;
1074
1075         for (i = 0; i < link->network->n_dns; i++) {
1076                 struct in_addr ia;
1077
1078                 /* Only look for IPv4 addresses */
1079                 if (link->network->dns[i].family != AF_INET)
1080                         continue;
1081
1082                 ia = link->network->dns[i].address.in;
1083
1084                 /* Never propagate obviously borked data */
1085                 if (in4_addr_is_null(&ia) || in4_addr_is_localhost(&ia))
1086                         continue;
1087
1088                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1089                         return log_oom();
1090
1091                 addresses[n_addresses++] = ia;
1092         }
1093
1094         if (link->network->dhcp_use_dns && link->dhcp_lease) {
1095                 const struct in_addr *da = NULL;
1096                 int j, n;
1097
1098                 n = sd_dhcp_lease_get_dns(link->dhcp_lease, &da);
1099                 if (n > 0) {
1100
1101                         if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1102                                 return log_oom();
1103
1104                         for (j = 0; j < n; j++)
1105                                 if (in4_addr_is_non_local(&da[j]))
1106                                         addresses[n_addresses++] = da[j];
1107                 }
1108         }
1109
1110         if (n_addresses <= 0)
1111                 return 0;
1112
1113         return sd_dhcp_server_set_dns(s, addresses, n_addresses);
1114 }
1115
1116 static int link_push_uplink_ntp_to_dhcp_server(Link *link, sd_dhcp_server *s) {
1117         _cleanup_free_ struct in_addr *addresses = NULL;
1118         size_t n_addresses = 0, n_allocated = 0;
1119         char **a;
1120
1121         if (!link->network)
1122                 return 0;
1123
1124         log_debug("Copying NTP server information from %s", link->ifname);
1125
1126         STRV_FOREACH(a, link->network->ntp) {
1127                 union in_addr_union ia;
1128
1129                 /* Only look for IPv4 addresses */
1130                 if (in_addr_from_string(AF_INET, *a, &ia) <= 0)
1131                         continue;
1132
1133                 /* Never propagate obviously borked data */
1134                 if (in4_addr_is_null(&ia.in) || in4_addr_is_localhost(&ia.in))
1135                         continue;
1136
1137                 if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + 1))
1138                         return log_oom();
1139
1140                 addresses[n_addresses++] = ia.in;
1141         }
1142
1143         if (link->network->dhcp_use_ntp && link->dhcp_lease) {
1144                 const struct in_addr *da = NULL;
1145                 int j, n;
1146
1147                 n = sd_dhcp_lease_get_ntp(link->dhcp_lease, &da);
1148                 if (n > 0) {
1149
1150                         if (!GREEDY_REALLOC(addresses, n_allocated, n_addresses + n))
1151                                 return log_oom();
1152
1153                         for (j = 0; j < n; j++)
1154                                 if (in4_addr_is_non_local(&da[j]))
1155                                         addresses[n_addresses++] = da[j];
1156                 }
1157         }
1158
1159         if (n_addresses <= 0)
1160                 return 0;
1161
1162         return sd_dhcp_server_set_ntp(s, addresses, n_addresses);
1163 }
1164
1165 static int link_set_bridge_fdb(Link *link) {
1166         FdbEntry *fdb_entry;
1167         int r;
1168
1169         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1170                 r = fdb_entry_configure(link, fdb_entry);
1171                 if (r < 0)
1172                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1173         }
1174
1175         return 0;
1176 }
1177
1178 static int link_request_set_addresses(Link *link) {
1179         AddressLabel *label;
1180         Address *ad;
1181         int r;
1182
1183         assert(link);
1184         assert(link->network);
1185         assert(link->state != _LINK_STATE_INVALID);
1186
1187         link_set_state(link, LINK_STATE_CONFIGURING);
1188
1189         /* Reset all *_configured flags we are configuring. */
1190         link->addresses_configured = false;
1191         link->addresses_ready = false;
1192         link->neighbors_configured = false;
1193         link->static_routes_configured = false;
1194         link->routing_policy_rules_configured = false;
1195
1196         r = link_set_bridge_fdb(link);
1197         if (r < 0)
1198                 return r;
1199
1200         r = link_request_set_neighbors(link);
1201         if (r < 0)
1202                 return r;
1203
1204         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1205                 bool update;
1206
1207                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1208
1209                 r = address_configure(ad, link, address_handler, update);
1210                 if (r < 0) {
1211                         log_link_warning_errno(link, r, "Could not set addresses: %m");
1212                         link_enter_failed(link);
1213                         return r;
1214                 }
1215                 if (r > 0)
1216                         link->address_messages++;
1217         }
1218
1219         LIST_FOREACH(labels, label, link->network->address_labels) {
1220                 r = address_label_configure(label, link, NULL, false);
1221                 if (r < 0) {
1222                         log_link_warning_errno(link, r, "Could not set address label: %m");
1223                         link_enter_failed(link);
1224                         return r;
1225                 }
1226
1227                 link->address_label_messages++;
1228         }
1229
1230         /* now that we can figure out a default address for the dhcp server,
1231            start it */
1232         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1233                 Address *address;
1234                 Link *uplink = NULL;
1235                 bool acquired_uplink = false;
1236
1237                 address = link_find_dhcp_server_address(link);
1238                 if (!address) {
1239                         log_link_warning(link, "Failed to find suitable address for DHCPv4 server instance.");
1240                         link_enter_failed(link);
1241                         return 0;
1242                 }
1243
1244                 /* use the server address' subnet as the pool */
1245                 r = sd_dhcp_server_configure_pool(link->dhcp_server, &address->in_addr.in, address->prefixlen,
1246                                                   link->network->dhcp_server_pool_offset, link->network->dhcp_server_pool_size);
1247                 if (r < 0)
1248                         return r;
1249
1250                 /* TODO:
1251                 r = sd_dhcp_server_set_router(link->dhcp_server,
1252                                               &main_address->in_addr.in);
1253                 if (r < 0)
1254                         return r;
1255                 */
1256
1257                 if (link->network->dhcp_server_max_lease_time_usec > 0) {
1258                         r = sd_dhcp_server_set_max_lease_time(
1259                                         link->dhcp_server,
1260                                         DIV_ROUND_UP(link->network->dhcp_server_max_lease_time_usec, USEC_PER_SEC));
1261                         if (r < 0)
1262                                 return r;
1263                 }
1264
1265                 if (link->network->dhcp_server_default_lease_time_usec > 0) {
1266                         r = sd_dhcp_server_set_default_lease_time(
1267                                         link->dhcp_server,
1268                                         DIV_ROUND_UP(link->network->dhcp_server_default_lease_time_usec, USEC_PER_SEC));
1269                         if (r < 0)
1270                                 return r;
1271                 }
1272
1273                 if (link->network->dhcp_server_emit_dns) {
1274
1275                         if (link->network->n_dhcp_server_dns > 0)
1276                                 r = sd_dhcp_server_set_dns(link->dhcp_server, link->network->dhcp_server_dns, link->network->n_dhcp_server_dns);
1277                         else {
1278                                 uplink = manager_find_uplink(link->manager, link);
1279                                 acquired_uplink = true;
1280
1281                                 if (!uplink) {
1282                                         log_link_debug(link, "Not emitting DNS server information on link, couldn't find suitable uplink.");
1283                                         r = 0;
1284                                 } else
1285                                         r = link_push_uplink_dns_to_dhcp_server(uplink, link->dhcp_server);
1286                         }
1287                         if (r < 0)
1288                                 log_link_warning_errno(link, r, "Failed to set DNS server for DHCP server, ignoring: %m");
1289                 }
1290
1291                 if (link->network->dhcp_server_emit_ntp) {
1292
1293                         if (link->network->n_dhcp_server_ntp > 0)
1294                                 r = sd_dhcp_server_set_ntp(link->dhcp_server, link->network->dhcp_server_ntp, link->network->n_dhcp_server_ntp);
1295                         else {
1296                                 if (!acquired_uplink)
1297                                         uplink = manager_find_uplink(link->manager, link);
1298
1299                                 if (!uplink) {
1300                                         log_link_debug(link, "Not emitting NTP server information on link, couldn't find suitable uplink.");
1301                                         r = 0;
1302                                 } else
1303                                         r = link_push_uplink_ntp_to_dhcp_server(uplink, link->dhcp_server);
1304
1305                         }
1306                         if (r < 0)
1307                                 log_link_warning_errno(link, r, "Failed to set NTP server for DHCP server, ignoring: %m");
1308                 }
1309
1310                 r = sd_dhcp_server_set_emit_router(link->dhcp_server, link->network->dhcp_server_emit_router);
1311                 if (r < 0)
1312                         return log_link_warning_errno(link, r, "Failed to set router emission for DHCP server: %m");
1313
1314                 if (link->network->dhcp_server_emit_timezone) {
1315                         _cleanup_free_ char *buffer = NULL;
1316                         const char *tz = NULL;
1317
1318                         if (link->network->dhcp_server_timezone)
1319                                 tz = link->network->dhcp_server_timezone;
1320                         else {
1321                                 r = get_timezone(&buffer);
1322                                 if (r < 0)
1323                                         log_warning_errno(r, "Failed to determine timezone: %m");
1324                                 else
1325                                         tz = buffer;
1326                         }
1327
1328                         if (tz) {
1329                                 r = sd_dhcp_server_set_timezone(link->dhcp_server, tz);
1330                                 if (r < 0)
1331                                         return r;
1332                         }
1333                 }
1334                 if (!sd_dhcp_server_is_running(link->dhcp_server)) {
1335                         r = sd_dhcp_server_start(link->dhcp_server);
1336                         if (r < 0) {
1337                                 log_link_warning_errno(link, r, "Could not start DHCPv4 server instance: %m");
1338
1339                                 link_enter_failed(link);
1340
1341                                 return 0;
1342                         }
1343                 }
1344
1345                 log_link_debug(link, "Offering DHCPv4 leases");
1346         }
1347
1348         if (link->address_messages == 0) {
1349                 link->addresses_configured = true;
1350                 link_check_ready(link);
1351         } else
1352                 log_link_debug(link, "Setting addresses");
1353
1354         return 0;
1355 }
1356
1357 static int link_set_bridge_vlan(Link *link) {
1358         int r;
1359
1360         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1361         if (r < 0)
1362                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1363
1364         return r;
1365 }
1366
1367 static int link_set_proxy_arp(Link *link) {
1368         int r;
1369
1370         if (!link_proxy_arp_enabled(link))
1371                 return 0;
1372
1373         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1374         if (r < 0)
1375                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1376
1377         return 0;
1378 }
1379
1380 static int link_configure_after_setting_mtu(Link *link);
1381
1382 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1383         int r;
1384
1385         assert(m);
1386         assert(link);
1387         assert(link->ifname);
1388
1389         link->setting_mtu = false;
1390
1391         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1392                 return 1;
1393
1394         r = sd_netlink_message_get_errno(m);
1395         if (r < 0) {
1396                 log_link_warning_errno(link, r, "Could not set MTU: %m");
1397                 return 1;
1398         }
1399
1400         log_link_debug(link, "Setting MTU done.");
1401
1402         if (link->state == LINK_STATE_INITIALIZED)
1403                 (void) link_configure_after_setting_mtu(link);
1404
1405         return 1;
1406 }
1407
1408 int link_set_mtu(Link *link, uint32_t mtu) {
1409         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1410         int r;
1411
1412         assert(link);
1413         assert(link->manager);
1414         assert(link->manager->rtnl);
1415
1416         if (mtu == 0 || link->setting_mtu)
1417                 return 0;
1418
1419         if (link->mtu == mtu)
1420                 return 0;
1421
1422         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1423
1424         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1425         if (r < 0)
1426                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1427
1428         /* If IPv6 not configured (no static IPv6 address and IPv6LL autoconfiguration is disabled)
1429          * for this interface, then disable IPv6 else enable it. */
1430         (void) link_enable_ipv6(link);
1431
1432         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1433          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1434         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1435
1436                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1437                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes: %m");
1438
1439                 mtu = IPV6_MIN_MTU;
1440         }
1441
1442         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1443         if (r < 0)
1444                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1445
1446         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1447                                link_netlink_destroy_callback, link);
1448         if (r < 0)
1449                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1450
1451         link_ref(link);
1452         link->setting_mtu = true;
1453
1454         return 0;
1455 }
1456
1457 static bool link_reduces_vlan_mtu(Link *link) {
1458         /* See netif_reduces_vlan_mtu() in kernel. */
1459         return streq_ptr(link->kind, "macsec");
1460 }
1461
1462 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1463         uint32_t mtu = 0;
1464         NetDev *dev;
1465         Iterator i;
1466
1467         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1468                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1469                         /* See vlan_dev_change_mtu() in kernel. */
1470                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1471
1472                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1473                         /* See macvlan_change_mtu() in kernel. */
1474                         mtu = dev->mtu;
1475
1476         return mtu;
1477 }
1478
1479 static int link_configure_mtu(Link *link) {
1480         uint32_t mtu;
1481
1482         assert(link);
1483         assert(link->network);
1484
1485         if (link->network->mtu > 0)
1486                 return link_set_mtu(link, link->network->mtu);
1487
1488         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1489         if (link->mtu >= mtu)
1490                 return 0;
1491
1492         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1493                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1494                         link->mtu, mtu);
1495
1496         return link_set_mtu(link, mtu);
1497 }
1498
1499 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1500         int r;
1501
1502         assert(m);
1503         assert(link);
1504         assert(link->ifname);
1505
1506         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1507                 return 1;
1508
1509         r = sd_netlink_message_get_errno(m);
1510         if (r < 0)
1511                 log_link_warning_errno(link, r, "Could not set link flags: %m");
1512
1513         return 1;
1514 }
1515
1516 static int link_set_flags(Link *link) {
1517         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1518         unsigned ifi_change = 0;
1519         unsigned ifi_flags = 0;
1520         int r;
1521
1522         assert(link);
1523         assert(link->manager);
1524         assert(link->manager->rtnl);
1525
1526         if (link->flags & IFF_LOOPBACK)
1527                 return 0;
1528
1529         if (!link->network)
1530                 return 0;
1531
1532         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1533                 return 0;
1534
1535         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1536         if (r < 0)
1537                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1538
1539         if (link->network->arp >= 0) {
1540                 ifi_change |= IFF_NOARP;
1541                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1542         }
1543
1544         if (link->network->multicast >= 0) {
1545                 ifi_change |= IFF_MULTICAST;
1546                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1547         }
1548
1549         if (link->network->allmulticast >= 0) {
1550                 ifi_change |= IFF_ALLMULTI;
1551                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1552         }
1553
1554         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1555         if (r < 0)
1556                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1557
1558         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1559                                link_netlink_destroy_callback, link);
1560         if (r < 0)
1561                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1562
1563         link_ref(link);
1564
1565         return 0;
1566 }
1567
1568 static int link_acquire_ipv6_conf(Link *link) {
1569         int r;
1570
1571         assert(link);
1572
1573         if (link_ipv6_accept_ra_enabled(link)) {
1574                 assert(link->ndisc);
1575
1576                 log_link_debug(link, "Discovering IPv6 routers");
1577
1578                 r = sd_ndisc_start(link->ndisc);
1579                 if (r < 0 && r != -EBUSY)
1580                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1581         }
1582
1583         if (link_radv_enabled(link)) {
1584                 assert(link->radv);
1585                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1586
1587                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1588
1589                 r = sd_radv_start(link->radv);
1590                 if (r < 0 && r != -EBUSY)
1591                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1592         }
1593
1594         (void) dhcp6_request_prefix_delegation(link);
1595
1596         return 0;
1597 }
1598
1599 static int link_acquire_ipv4_conf(Link *link) {
1600         int r;
1601
1602         assert(link);
1603         assert(link->manager);
1604         assert(link->manager->event);
1605
1606         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1607                 assert(link->ipv4ll);
1608
1609                 log_link_debug(link, "Acquiring IPv4 link-local address");
1610
1611                 r = sd_ipv4ll_start(link->ipv4ll);
1612                 if (r < 0)
1613                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1614         }
1615
1616         if (link_dhcp4_enabled(link)) {
1617                 assert(link->dhcp_client);
1618
1619                 log_link_debug(link, "Acquiring DHCPv4 lease");
1620
1621                 r = sd_dhcp_client_start(link->dhcp_client);
1622                 if (r < 0)
1623                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1624         }
1625
1626         return 0;
1627 }
1628
1629 static int link_acquire_conf(Link *link) {
1630         int r;
1631
1632         assert(link);
1633
1634         r = link_acquire_ipv4_conf(link);
1635         if (r < 0)
1636                 return r;
1637
1638         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1639                 r = link_acquire_ipv6_conf(link);
1640                 if (r < 0)
1641                         return r;
1642         }
1643
1644         if (link_lldp_emit_enabled(link)) {
1645                 r = link_lldp_emit_start(link);
1646                 if (r < 0)
1647                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1648         }
1649
1650         return 0;
1651 }
1652
1653 bool link_has_carrier(Link *link) {
1654         /* see Documentation/networking/operstates.txt in the kernel sources */
1655
1656         if (link->kernel_operstate == IF_OPER_UP)
1657                 return true;
1658
1659         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1660                 /* operstate may not be implemented, so fall back to flags */
1661                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1662                     !FLAGS_SET(link->flags, IFF_DORMANT))
1663                         return true;
1664
1665         return false;
1666 }
1667
1668 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1669         int r;
1670
1671         assert(link);
1672
1673         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1674                 return 1;
1675
1676         r = sd_netlink_message_get_errno(m);
1677         if (r < 0)
1678                 log_link_warning_errno(link, r, "Could not set address genmode for interface: %m");
1679
1680         return 1;
1681 }
1682
1683 static int link_configure_addrgen_mode(Link *link) {
1684         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1685         uint8_t ipv6ll_mode;
1686         int r;
1687
1688         assert(link);
1689         assert(link->network);
1690         assert(link->manager);
1691         assert(link->manager->rtnl);
1692
1693         if (!socket_ipv6_is_supported())
1694                 return 0;
1695
1696         log_link_debug(link, "Setting address genmode for link");
1697
1698         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1699         if (r < 0)
1700                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1701
1702         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1703         if (r < 0)
1704                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1705
1706         r = sd_netlink_message_open_container(req, AF_INET6);
1707         if (r < 0)
1708                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1709
1710         if (!link_ipv6ll_enabled(link))
1711                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1712         else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1713                 /* The file may not exist. And event if it exists, when stable_secret is unset,
1714                  * reading the file fails with EIO. */
1715                 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1716         else
1717                 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1718
1719         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1720         if (r < 0)
1721                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1722
1723         r = sd_netlink_message_close_container(req);
1724         if (r < 0)
1725                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1726
1727         r = sd_netlink_message_close_container(req);
1728         if (r < 0)
1729                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1730
1731         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1732                                link_netlink_destroy_callback, link);
1733         if (r < 0)
1734                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1735
1736         link_ref(link);
1737
1738         return 0;
1739 }
1740
1741 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1742         int r;
1743
1744         assert(link);
1745
1746         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1747                 return 1;
1748
1749         r = sd_netlink_message_get_errno(m);
1750         if (r < 0)
1751                 /* we warn but don't fail the link, as it may be brought up later */
1752                 log_link_warning_errno(link, r, "Could not bring up interface: %m");
1753
1754         return 1;
1755 }
1756
1757 static int link_up(Link *link) {
1758         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1759         int r;
1760
1761         assert(link);
1762         assert(link->network);
1763         assert(link->manager);
1764         assert(link->manager->rtnl);
1765
1766         log_link_debug(link, "Bringing link up");
1767
1768         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1769         if (r < 0)
1770                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1771
1772         /* set it free if not enslaved with networkd */
1773         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1774                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1775                 if (r < 0)
1776                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1777         }
1778
1779         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1780         if (r < 0)
1781                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1782
1783         if (link->network->mac) {
1784                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1785                 if (r < 0)
1786                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1787         }
1788
1789         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1790                                link_netlink_destroy_callback, link);
1791         if (r < 0)
1792                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1793
1794         link_ref(link);
1795
1796         return 0;
1797 }
1798
1799 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1800         int r;
1801
1802         assert(link);
1803
1804         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1805                 return 1;
1806
1807         r = sd_netlink_message_get_errno(m);
1808         if (r < 0)
1809                 log_link_warning_errno(link, r, "Could not bring down interface: %m");
1810
1811         return 1;
1812 }
1813
1814 int link_down(Link *link, link_netlink_message_handler_t callback) {
1815         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1816         int r;
1817
1818         assert(link);
1819         assert(link->manager);
1820         assert(link->manager->rtnl);
1821
1822         log_link_debug(link, "Bringing link down");
1823
1824         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1825                                      RTM_SETLINK, link->ifindex);
1826         if (r < 0)
1827                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1828
1829         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1830         if (r < 0)
1831                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1832
1833         r = netlink_call_async(link->manager->rtnl, NULL, req,
1834                                callback ?: link_down_handler,
1835                                link_netlink_destroy_callback, link);
1836         if (r < 0)
1837                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1838
1839         link_ref(link);
1840
1841         return 0;
1842 }
1843
1844 static int link_handle_bound_to_list(Link *link) {
1845         Link *l;
1846         Iterator i;
1847         int r;
1848         bool required_up = false;
1849         bool link_is_up = false;
1850
1851         assert(link);
1852
1853         if (hashmap_isempty(link->bound_to_links))
1854                 return 0;
1855
1856         if (link->flags & IFF_UP)
1857                 link_is_up = true;
1858
1859         HASHMAP_FOREACH (l, link->bound_to_links, i)
1860                 if (link_has_carrier(l)) {
1861                         required_up = true;
1862                         break;
1863                 }
1864
1865         if (!required_up && link_is_up) {
1866                 r = link_down(link, NULL);
1867                 if (r < 0)
1868                         return r;
1869         } else if (required_up && !link_is_up) {
1870                 r = link_up(link);
1871                 if (r < 0)
1872                         return r;
1873         }
1874
1875         return 0;
1876 }
1877
1878 static int link_handle_bound_by_list(Link *link) {
1879         Iterator i;
1880         Link *l;
1881         int r;
1882
1883         assert(link);
1884
1885         if (hashmap_isempty(link->bound_by_links))
1886                 return 0;
1887
1888         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1889                 r = link_handle_bound_to_list(l);
1890                 if (r < 0)
1891                         return r;
1892         }
1893
1894         return 0;
1895 }
1896
1897 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1898         int r;
1899
1900         assert(link);
1901         assert(carrier);
1902
1903         if (link == carrier)
1904                 return 0;
1905
1906         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1907                 return 0;
1908
1909         r = hashmap_ensure_allocated(h, NULL);
1910         if (r < 0)
1911                 return r;
1912
1913         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1914         if (r < 0)
1915                 return r;
1916
1917         return 0;
1918 }
1919
1920 static int link_new_bound_by_list(Link *link) {
1921         Manager *m;
1922         Link *carrier;
1923         Iterator i;
1924         int r;
1925         bool list_updated = false;
1926
1927         assert(link);
1928         assert(link->manager);
1929
1930         m = link->manager;
1931
1932         HASHMAP_FOREACH(carrier, m->links, i) {
1933                 if (!carrier->network)
1934                         continue;
1935
1936                 if (strv_isempty(carrier->network->bind_carrier))
1937                         continue;
1938
1939                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname, 0)) {
1940                         r = link_put_carrier(link, carrier, &link->bound_by_links);
1941                         if (r < 0)
1942                                 return r;
1943
1944                         list_updated = true;
1945                 }
1946         }
1947
1948         if (list_updated)
1949                 link_dirty(link);
1950
1951         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1952                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1953                 if (r < 0)
1954                         return r;
1955
1956                 link_dirty(carrier);
1957         }
1958
1959         return 0;
1960 }
1961
1962 static int link_new_bound_to_list(Link *link) {
1963         Manager *m;
1964         Link *carrier;
1965         Iterator i;
1966         int r;
1967         bool list_updated = false;
1968
1969         assert(link);
1970         assert(link->manager);
1971
1972         if (!link->network)
1973                 return 0;
1974
1975         if (strv_isempty(link->network->bind_carrier))
1976                 return 0;
1977
1978         m = link->manager;
1979
1980         HASHMAP_FOREACH (carrier, m->links, i) {
1981                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname, 0)) {
1982                         r = link_put_carrier(link, carrier, &link->bound_to_links);
1983                         if (r < 0)
1984                                 return r;
1985
1986                         list_updated = true;
1987                 }
1988         }
1989
1990         if (list_updated)
1991                 link_dirty(link);
1992
1993         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
1994                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
1995                 if (r < 0)
1996                         return r;
1997
1998                 link_dirty(carrier);
1999         }
2000
2001         return 0;
2002 }
2003
2004 static int link_new_carrier_maps(Link *link) {
2005         int r;
2006
2007         r = link_new_bound_by_list(link);
2008         if (r < 0)
2009                 return r;
2010
2011         r = link_handle_bound_by_list(link);
2012         if (r < 0)
2013                 return r;
2014
2015         r = link_new_bound_to_list(link);
2016         if (r < 0)
2017                 return r;
2018
2019         r = link_handle_bound_to_list(link);
2020         if (r < 0)
2021                 return r;
2022
2023         return 0;
2024 }
2025
2026 static void link_free_bound_to_list(Link *link) {
2027         Link *bound_to;
2028         Iterator i;
2029
2030         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2031                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2032
2033                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2034                         link_dirty(bound_to);
2035         }
2036
2037         return;
2038 }
2039
2040 static void link_free_bound_by_list(Link *link) {
2041         Link *bound_by;
2042         Iterator i;
2043
2044         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2045                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2046
2047                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2048                         link_dirty(bound_by);
2049                         link_handle_bound_to_list(bound_by);
2050                 }
2051         }
2052
2053         return;
2054 }
2055
2056 static void link_free_carrier_maps(Link *link) {
2057         bool list_updated = false;
2058
2059         assert(link);
2060
2061         if (!hashmap_isempty(link->bound_to_links)) {
2062                 link_free_bound_to_list(link);
2063                 list_updated = true;
2064         }
2065
2066         if (!hashmap_isempty(link->bound_by_links)) {
2067                 link_free_bound_by_list(link);
2068                 list_updated = true;
2069         }
2070
2071         if (list_updated)
2072                 link_dirty(link);
2073
2074         return;
2075 }
2076
2077 static int link_append_to_master(Link *link, NetDev *netdev) {
2078         Link *master;
2079         int r;
2080
2081         assert(link);
2082         assert(netdev);
2083
2084         r = link_get(link->manager, netdev->ifindex, &master);
2085         if (r < 0)
2086                 return r;
2087
2088         r = set_ensure_allocated(&master->slaves, NULL);
2089         if (r < 0)
2090                 return r;
2091
2092         r = set_put(master->slaves, link);
2093         if (r < 0)
2094                 return r;
2095
2096         link_ref(link);
2097         return 0;
2098 }
2099
2100 static void link_drop_from_master(Link *link, NetDev *netdev) {
2101         Link *master;
2102
2103         assert(link);
2104
2105         if (!link->manager || !netdev)
2106                 return;
2107
2108         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2109                 return;
2110
2111         link_unref(set_remove(master->slaves, link));
2112 }
2113
2114 static void link_detach_from_manager(Link *link) {
2115         if (!link || !link->manager)
2116                 return;
2117
2118         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2119         link_clean(link);
2120
2121         /* The following must be called at last. */
2122         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2123         link_unref(link);
2124 }
2125
2126 void link_drop(Link *link) {
2127         if (!link || link->state == LINK_STATE_LINGER)
2128                 return;
2129
2130         link_set_state(link, LINK_STATE_LINGER);
2131
2132         link_free_carrier_maps(link);
2133
2134         if (link->network) {
2135                 link_drop_from_master(link, link->network->bridge);
2136                 link_drop_from_master(link, link->network->bond);
2137         }
2138
2139         log_link_debug(link, "Link removed");
2140
2141         (void) unlink(link->state_file);
2142         link_detach_from_manager(link);
2143 }
2144
2145 static int link_joined(Link *link) {
2146         int r;
2147
2148         assert(link);
2149         assert(link->network);
2150
2151         if (!hashmap_isempty(link->bound_to_links)) {
2152                 r = link_handle_bound_to_list(link);
2153                 if (r < 0)
2154                         return r;
2155         } else if (!(link->flags & IFF_UP)) {
2156                 r = link_up(link);
2157                 if (r < 0) {
2158                         link_enter_failed(link);
2159                         return r;
2160                 }
2161         }
2162
2163         if (link->network->bridge) {
2164                 r = link_set_bridge(link);
2165                 if (r < 0)
2166                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2167
2168                 r = link_append_to_master(link, link->network->bridge);
2169                 if (r < 0)
2170                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2171         }
2172
2173         if (link->network->bond) {
2174                 r = link_set_bond(link);
2175                 if (r < 0)
2176                         log_link_error_errno(link, r, "Could not set bond message: %m");
2177
2178                 r = link_append_to_master(link, link->network->bond);
2179                 if (r < 0)
2180                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2181         }
2182
2183         if (link->network->use_br_vlan &&
2184             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2185                 r = link_set_bridge_vlan(link);
2186                 if (r < 0)
2187                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2188         }
2189
2190         /* Skip setting up addresses until it gets carrier,
2191            or it would try to set addresses twice,
2192            which is bad for non-idempotent steps. */
2193         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2194                 return 0;
2195
2196         return link_request_set_addresses(link);
2197 }
2198
2199 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2200         int r;
2201
2202         assert(link);
2203         assert(link->network);
2204         assert(link->enslaving > 0);
2205
2206         link->enslaving--;
2207
2208         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2209                 return 1;
2210
2211         r = sd_netlink_message_get_errno(m);
2212         if (r < 0 && r != -EEXIST) {
2213                 log_link_error_errno(link, r, "Could not join netdev: %m");
2214                 link_enter_failed(link);
2215                 return 1;
2216         } else
2217                 log_link_debug(link, "Joined netdev");
2218
2219         if (link->enslaving == 0) {
2220                 link_joined(link);
2221         }
2222
2223         return 1;
2224 }
2225
2226 static int link_enter_join_netdev(Link *link) {
2227         NetDev *netdev;
2228         Iterator i;
2229         int r;
2230
2231         assert(link);
2232         assert(link->network);
2233         assert(link->state == LINK_STATE_INITIALIZED);
2234
2235         link_set_state(link, LINK_STATE_CONFIGURING);
2236
2237         link_dirty(link);
2238         link->enslaving = 0;
2239
2240         if (link->network->bond) {
2241                 if (link->network->bond->state == NETDEV_STATE_READY &&
2242                     link->network->bond->ifindex == link->master_ifindex)
2243                         return link_joined(link);
2244
2245                 log_struct(LOG_DEBUG,
2246                            LOG_LINK_INTERFACE(link),
2247                            LOG_NETDEV_INTERFACE(link->network->bond),
2248                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2249
2250                 link->enslaving++;
2251
2252                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2253                 if (r < 0) {
2254                         log_struct_errno(LOG_WARNING, r,
2255                                          LOG_LINK_INTERFACE(link),
2256                                          LOG_NETDEV_INTERFACE(link->network->bond),
2257                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2258                         link_enter_failed(link);
2259                         return r;
2260                 }
2261         }
2262
2263         if (link->network->bridge) {
2264                 log_struct(LOG_DEBUG,
2265                            LOG_LINK_INTERFACE(link),
2266                            LOG_NETDEV_INTERFACE(link->network->bridge),
2267                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2268
2269                 link->enslaving++;
2270
2271                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2272                 if (r < 0) {
2273                         log_struct_errno(LOG_WARNING, r,
2274                                          LOG_LINK_INTERFACE(link),
2275                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2276                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2277                         link_enter_failed(link);
2278                         return r;
2279                 }
2280         }
2281
2282         if (link->network->vrf) {
2283                 log_struct(LOG_DEBUG,
2284                            LOG_LINK_INTERFACE(link),
2285                            LOG_NETDEV_INTERFACE(link->network->vrf),
2286                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2287
2288                 link->enslaving++;
2289
2290                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2291                 if (r < 0) {
2292                         log_struct_errno(LOG_WARNING, r,
2293                                          LOG_LINK_INTERFACE(link),
2294                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2295                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2296                         link_enter_failed(link);
2297                         return r;
2298                 }
2299         }
2300
2301         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2302
2303                 if (netdev->ifindex > 0)
2304                         /* Assume already enslaved. */
2305                         continue;
2306
2307                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2308                         continue;
2309
2310                 log_struct(LOG_DEBUG,
2311                            LOG_LINK_INTERFACE(link),
2312                            LOG_NETDEV_INTERFACE(netdev),
2313                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2314
2315                 link->enslaving++;
2316
2317                 r = netdev_join(netdev, link, netdev_join_handler);
2318                 if (r < 0) {
2319                         log_struct_errno(LOG_WARNING, r,
2320                                          LOG_LINK_INTERFACE(link),
2321                                          LOG_NETDEV_INTERFACE(netdev),
2322                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2323                         link_enter_failed(link);
2324                         return r;
2325                 }
2326         }
2327
2328         if (link->enslaving == 0)
2329                 return link_joined(link);
2330
2331         return 0;
2332 }
2333
2334 static int link_set_ipv4_forward(Link *link) {
2335         int r;
2336
2337         if (!link_ipv4_forward_enabled(link))
2338                 return 0;
2339
2340         /* We propagate the forwarding flag from one interface to the
2341          * global setting one way. This means: as long as at least one
2342          * interface was configured at any time that had IP forwarding
2343          * enabled the setting will stay on for good. We do this
2344          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2345          * somewhat in sync (see below). */
2346
2347         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2348         if (r < 0)
2349                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2350
2351         return 0;
2352 }
2353
2354 static int link_set_ipv6_forward(Link *link) {
2355         int r;
2356
2357         if (!link_ipv6_forward_enabled(link))
2358                 return 0;
2359
2360         /* On Linux, the IPv6 stack does not know a per-interface
2361          * packet forwarding setting: either packet forwarding is on
2362          * for all, or off for all. We hence don't bother with a
2363          * per-interface setting, but simply propagate the interface
2364          * flag, if it is set, to the global flag, one-way. Note that
2365          * while IPv4 would allow a per-interface flag, we expose the
2366          * same behaviour there and also propagate the setting from
2367          * one to all, to keep things simple (see above). */
2368
2369         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2370         if (r < 0)
2371                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2372
2373         return 0;
2374 }
2375
2376 static int link_set_ipv6_privacy_extensions(Link *link) {
2377         IPv6PrivacyExtensions s;
2378         int r;
2379
2380         s = link_ipv6_privacy_extensions(link);
2381         if (s < 0)
2382                 return 0;
2383
2384         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2385         if (r < 0)
2386                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2387
2388         return 0;
2389 }
2390
2391 static int link_set_ipv6_accept_ra(Link *link) {
2392         int r;
2393
2394         /* Make this a NOP if IPv6 is not available */
2395         if (!socket_ipv6_is_supported())
2396                 return 0;
2397
2398         if (link->flags & IFF_LOOPBACK)
2399                 return 0;
2400
2401         if (!link->network)
2402                 return 0;
2403
2404         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2405         if (r < 0)
2406                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2407
2408         return 0;
2409 }
2410
2411 static int link_set_ipv6_dad_transmits(Link *link) {
2412         int r;
2413
2414         /* Make this a NOP if IPv6 is not available */
2415         if (!socket_ipv6_is_supported())
2416                 return 0;
2417
2418         if (link->flags & IFF_LOOPBACK)
2419                 return 0;
2420
2421         if (!link->network)
2422                 return 0;
2423
2424         if (link->network->ipv6_dad_transmits < 0)
2425                 return 0;
2426
2427         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2428         if (r < 0)
2429                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2430
2431         return 0;
2432 }
2433
2434 static int link_set_ipv6_hop_limit(Link *link) {
2435         int r;
2436
2437         /* Make this a NOP if IPv6 is not available */
2438         if (!socket_ipv6_is_supported())
2439                 return 0;
2440
2441         if (link->flags & IFF_LOOPBACK)
2442                 return 0;
2443
2444         if (!link->network)
2445                 return 0;
2446
2447         if (link->network->ipv6_hop_limit < 0)
2448                 return 0;
2449
2450         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2451         if (r < 0)
2452                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2453
2454         return 0;
2455 }
2456
2457 static int link_set_ipv6_mtu(Link *link) {
2458         int r;
2459
2460         /* Make this a NOP if IPv6 is not available */
2461         if (!socket_ipv6_is_supported())
2462                 return 0;
2463
2464         if (link->flags & IFF_LOOPBACK)
2465                 return 0;
2466
2467         if (link->network->ipv6_mtu == 0)
2468                 return 0;
2469
2470         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2471         if (r < 0)
2472                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2473
2474         return 0;
2475 }
2476
2477 static bool link_is_static_address_configured(Link *link, Address *address) {
2478         Address *net_address;
2479
2480         assert(link);
2481         assert(address);
2482
2483         if (!link->network)
2484                 return false;
2485
2486         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2487                 if (address_equal(net_address, address))
2488                         return true;
2489
2490         return false;
2491 }
2492
2493 static bool link_is_static_route_configured(Link *link, Route *route) {
2494         Route *net_route;
2495
2496         assert(link);
2497         assert(route);
2498
2499         if (!link->network)
2500                 return false;
2501
2502         LIST_FOREACH(routes, net_route, link->network->static_routes)
2503                 if (route_equal(net_route, route))
2504                         return true;
2505
2506         return false;
2507 }
2508
2509 static bool link_address_is_dynamic(Link *link, Address *address) {
2510         Route *route;
2511         Iterator i;
2512
2513         assert(link);
2514         assert(address);
2515
2516         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2517                 return true;
2518
2519         /* Even when the address is leased from a DHCP server, networkd assign the address
2520          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2521          * corresponding routes with RTPROT_DHCP. */
2522         SET_FOREACH(route, link->routes_foreign, i) {
2523                 if (route->protocol != RTPROT_DHCP)
2524                         continue;
2525
2526                 if (address->family != route->family)
2527                         continue;
2528
2529                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2530                         return true;
2531         }
2532
2533         return false;
2534 }
2535
2536 static int link_drop_foreign_config(Link *link) {
2537         Address *address;
2538         Route *route;
2539         Iterator i;
2540         int r;
2541
2542         SET_FOREACH(address, link->addresses_foreign, i) {
2543                 /* we consider IPv6LL addresses to be managed by the kernel */
2544                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2545                         continue;
2546
2547                 if (link_address_is_dynamic(link, address)) {
2548                         if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2549                                 continue;
2550                 } else if (FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2551                         continue;
2552
2553                 if (link_is_static_address_configured(link, address)) {
2554                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2555                         if (r < 0)
2556                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2557                 } else {
2558                         r = address_remove(address, link, NULL);
2559                         if (r < 0)
2560                                 return r;
2561                 }
2562         }
2563
2564         SET_FOREACH(route, link->routes_foreign, i) {
2565                 /* do not touch routes managed by the kernel */
2566                 if (route->protocol == RTPROT_KERNEL)
2567                         continue;
2568
2569                 if (route->protocol == RTPROT_STATIC &&
2570                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2571                         continue;
2572
2573                 if (route->protocol == RTPROT_DHCP &&
2574                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2575                         continue;
2576
2577                 if (link_is_static_route_configured(link, route)) {
2578                         r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL);
2579                         if (r < 0)
2580                                 return r;
2581                 } else {
2582                         r = route_remove(route, link, NULL);
2583                         if (r < 0)
2584                                 return r;
2585                 }
2586         }
2587
2588         return 0;
2589 }
2590
2591 static int link_drop_config(Link *link) {
2592         Address *address, *pool_address;
2593         Route *route;
2594         Iterator i;
2595         int r;
2596
2597         SET_FOREACH(address, link->addresses, i) {
2598                 /* we consider IPv6LL addresses to be managed by the kernel */
2599                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1)
2600                         continue;
2601
2602                 r = address_remove(address, link, NULL);
2603                 if (r < 0)
2604                         return r;
2605
2606                 /* If this address came from an address pool, clean up the pool */
2607                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2608                         if (address_equal(address, pool_address)) {
2609                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2610                                 address_free(pool_address);
2611                                 break;
2612                         }
2613                 }
2614         }
2615
2616         SET_FOREACH(route, link->routes, i) {
2617                 /* do not touch routes managed by the kernel */
2618                 if (route->protocol == RTPROT_KERNEL)
2619                         continue;
2620
2621                 r = route_remove(route, link, NULL);
2622                 if (r < 0)
2623                         return r;
2624         }
2625
2626         ndisc_flush(link);
2627
2628         return 0;
2629 }
2630
2631 static int link_configure(Link *link) {
2632         int r;
2633
2634         assert(link);
2635         assert(link->network);
2636         assert(link->state == LINK_STATE_INITIALIZED);
2637
2638         if (STRPTR_IN_SET(link->kind, "can", "vcan", "vxcan"))
2639                 return link_configure_can(link);
2640
2641         /* Drop foreign config, but ignore loopback or critical devices.
2642          * We do not want to remove loopback address or addresses used for root NFS. */
2643         if (!(link->flags & IFF_LOOPBACK) &&
2644             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2645                 r = link_drop_foreign_config(link);
2646                 if (r < 0)
2647                         return r;
2648         }
2649
2650         r = link_set_proxy_arp(link);
2651         if (r < 0)
2652                return r;
2653
2654         r = ipv6_proxy_ndp_addresses_configure(link);
2655         if (r < 0)
2656                 return r;
2657
2658         r = link_set_ipv4_forward(link);
2659         if (r < 0)
2660                 return r;
2661
2662         r = link_set_ipv6_forward(link);
2663         if (r < 0)
2664                 return r;
2665
2666         r = link_set_ipv6_privacy_extensions(link);
2667         if (r < 0)
2668                 return r;
2669
2670         r = link_set_ipv6_accept_ra(link);
2671         if (r < 0)
2672                 return r;
2673
2674         r = link_set_ipv6_dad_transmits(link);
2675         if (r < 0)
2676                 return r;
2677
2678         r = link_set_ipv6_hop_limit(link);
2679         if (r < 0)
2680                 return r;
2681
2682         r = link_set_flags(link);
2683         if (r < 0)
2684                 return r;
2685
2686         r = link_set_ipv6_mtu(link);
2687         if (r < 0)
2688                 return r;
2689
2690         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2691                 r = ipv4ll_configure(link);
2692                 if (r < 0)
2693                         return r;
2694         }
2695
2696         if (link_dhcp4_enabled(link)) {
2697                 r = dhcp4_set_promote_secondaries(link);
2698                 if (r < 0)
2699                         return r;
2700
2701                 r = dhcp4_configure(link);
2702                 if (r < 0)
2703                         return r;
2704         }
2705
2706         if (link_dhcp4_server_enabled(link)) {
2707                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2708                 if (r < 0)
2709                         return r;
2710
2711                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2712                 if (r < 0)
2713                         return r;
2714         }
2715
2716         if (link_dhcp6_enabled(link) ||
2717             link_ipv6_accept_ra_enabled(link)) {
2718                 r = dhcp6_configure(link);
2719                 if (r < 0)
2720                         return r;
2721         }
2722
2723         if (link_ipv6_accept_ra_enabled(link)) {
2724                 r = ndisc_configure(link);
2725                 if (r < 0)
2726                         return r;
2727         }
2728
2729         if (link_radv_enabled(link)) {
2730                 r = radv_configure(link);
2731                 if (r < 0)
2732                         return r;
2733         }
2734
2735         if (link_lldp_rx_enabled(link)) {
2736                 r = link_lldp_rx_configure(link);
2737                 if (r < 0)
2738                         return r;
2739         }
2740
2741         r = link_configure_mtu(link);
2742         if (r < 0)
2743                 return r;
2744
2745         r = link_configure_addrgen_mode(link);
2746         if (r < 0)
2747                 return r;
2748
2749         return link_configure_after_setting_mtu(link);
2750 }
2751
2752 static int link_configure_after_setting_mtu(Link *link) {
2753         int r;
2754
2755         assert(link);
2756         assert(link->network);
2757         assert(link->state == LINK_STATE_INITIALIZED);
2758
2759         if (link->setting_mtu)
2760                 return 0;
2761
2762         if (link_has_carrier(link) || link->network->configure_without_carrier) {
2763                 r = link_acquire_conf(link);
2764                 if (r < 0)
2765                         return r;
2766         }
2767
2768         return link_enter_join_netdev(link);
2769 }
2770
2771 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2772         assert(duid);
2773
2774         if (duid->raw_data_len > 0)
2775                 return 0;
2776
2777         if (duid->type != DUID_TYPE_UUID)
2778                 return -EINVAL;
2779
2780         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2781         duid->raw_data_len = sizeof(sd_id128_t);
2782
2783         return 1;
2784 }
2785
2786 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
2787         Manager *manager = userdata;
2788         const sd_bus_error *e;
2789         const void *a;
2790         size_t sz;
2791         DUID *duid;
2792         Link *link;
2793         int r;
2794
2795         assert(m);
2796         assert(manager);
2797
2798         e = sd_bus_message_get_error(m);
2799         if (e) {
2800                 log_error_errno(sd_bus_error_get_errno(e),
2801                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
2802                                 e->message);
2803                 goto configure;
2804         }
2805
2806         r = sd_bus_message_read_array(m, 'y', &a, &sz);
2807         if (r < 0)
2808                 goto configure;
2809
2810         if (sz != sizeof(sd_id128_t)) {
2811                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
2812                 goto configure;
2813         }
2814
2815         memcpy(&manager->product_uuid, a, sz);
2816         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
2817                 (void) duid_set_uuid(duid, manager->product_uuid);
2818
2819         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
2820
2821 configure:
2822         while ((link = set_steal_first(manager->links_requesting_uuid))) {
2823                 r = link_configure(link);
2824                 if (r < 0)
2825                         log_link_error_errno(link, r, "Failed to configure link: %m");
2826         }
2827
2828         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
2829
2830         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
2831          * even if the method fails. */
2832         manager->has_product_uuid = true;
2833
2834         return 1;
2835 }
2836
2837 static bool link_requires_uuid(Link *link) {
2838         const DUID *duid;
2839
2840         assert(link);
2841         assert(link->manager);
2842         assert(link->network);
2843
2844         duid = link_get_duid(link);
2845         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
2846                 return false;
2847
2848         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
2849                 return true;
2850
2851         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
2852                 return true;
2853
2854         return false;
2855 }
2856
2857 static int link_configure_duid(Link *link) {
2858         Manager *m;
2859         DUID *duid;
2860         int r;
2861
2862         assert(link);
2863         assert(link->manager);
2864         assert(link->network);
2865
2866         m = link->manager;
2867         duid = link_get_duid(link);
2868
2869         if (!link_requires_uuid(link))
2870                 return 1;
2871
2872         if (m->has_product_uuid) {
2873                 (void) duid_set_uuid(duid, m->product_uuid);
2874                 return 1;
2875         }
2876
2877         if (!m->links_requesting_uuid) {
2878                 r = manager_request_product_uuid(m, link);
2879                 if (r < 0) {
2880                         if (r == -ENOMEM)
2881                                 return r;
2882
2883                         log_link_warning_errno(link, r,
2884                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
2885                         return 1;
2886                 }
2887         } else {
2888                 r = set_put(m->links_requesting_uuid, link);
2889                 if (r < 0)
2890                         return log_oom();
2891
2892                 r = set_put(m->duids_requesting_uuid, duid);
2893                 if (r < 0)
2894                         return log_oom();
2895         }
2896
2897         return 0;
2898 }
2899
2900 static int link_initialized_and_synced(Link *link) {
2901         Network *network;
2902         int r;
2903
2904         assert(link);
2905         assert(link->ifname);
2906         assert(link->manager);
2907
2908         /* We may get called either from the asynchronous netlink callback,
2909          * or directly for link_add() if running in a container. See link_add(). */
2910         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
2911                 return 0;
2912
2913         log_link_debug(link, "Link state is up-to-date");
2914         link_set_state(link, LINK_STATE_INITIALIZED);
2915
2916         r = link_new_bound_by_list(link);
2917         if (r < 0)
2918                 return r;
2919
2920         r = link_handle_bound_by_list(link);
2921         if (r < 0)
2922                 return r;
2923
2924         if (!link->network) {
2925                 r = network_get(link->manager, link->sd_device, link->ifname,
2926                                 &link->mac, &network);
2927                 if (r == -ENOENT) {
2928                         link_enter_unmanaged(link);
2929                         return 0;
2930                 } else if (r == 0 && network->unmanaged) {
2931                         link_enter_unmanaged(link);
2932                         return 0;
2933                 } else if (r < 0)
2934                         return r;
2935
2936                 if (link->flags & IFF_LOOPBACK) {
2937                         if (network->link_local != ADDRESS_FAMILY_NO)
2938                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
2939
2940                         if (network->dhcp != ADDRESS_FAMILY_NO)
2941                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
2942
2943                         if (network->dhcp_server)
2944                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
2945                 }
2946
2947                 r = network_apply(network, link);
2948                 if (r < 0)
2949                         return r;
2950         }
2951
2952         r = link_new_bound_to_list(link);
2953         if (r < 0)
2954                 return r;
2955
2956         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
2957          * link_configure() is called later asynchronously. */
2958         r = link_configure_duid(link);
2959         if (r <= 0)
2960                 return r;
2961
2962         r = link_configure(link);
2963         if (r < 0)
2964                 return r;
2965
2966         return 0;
2967 }
2968
2969 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2970         (void) link_initialized_and_synced(link);
2971         return 1;
2972 }
2973
2974 int link_initialized(Link *link, sd_device *device) {
2975         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2976         int r;
2977
2978         assert(link);
2979         assert(link->manager);
2980         assert(link->manager->rtnl);
2981         assert(device);
2982
2983         if (link->state != LINK_STATE_PENDING)
2984                 return 0;
2985
2986         if (link->sd_device)
2987                 return 0;
2988
2989         log_link_debug(link, "udev initialized link");
2990         link_set_state(link, LINK_STATE_INITIALIZED);
2991
2992         link->sd_device = sd_device_ref(device);
2993
2994         /* udev has initialized the link, but we don't know if we have yet
2995          * processed the NEWLINK messages with the latest state. Do a GETLINK,
2996          * when it returns we know that the pending NEWLINKs have already been
2997          * processed and that we are up-to-date */
2998
2999         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3000                                      link->ifindex);
3001         if (r < 0)
3002                 return r;
3003
3004         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3005                                link_netlink_destroy_callback, link);
3006         if (r < 0)
3007                 return r;
3008
3009         link_ref(link);
3010
3011         return 0;
3012 }
3013
3014 static int link_load(Link *link) {
3015         _cleanup_free_ char *network_file = NULL,
3016                             *addresses = NULL,
3017                             *routes = NULL,
3018                             *dhcp4_address = NULL,
3019                             *ipv4ll_address = NULL;
3020         union in_addr_union address;
3021         union in_addr_union route_dst;
3022         const char *p;
3023         int r;
3024
3025         assert(link);
3026
3027         r = parse_env_file(NULL, link->state_file,
3028                            "NETWORK_FILE", &network_file,
3029                            "ADDRESSES", &addresses,
3030                            "ROUTES", &routes,
3031                            "DHCP4_ADDRESS", &dhcp4_address,
3032                            "IPV4LL_ADDRESS", &ipv4ll_address);
3033         if (r < 0 && r != -ENOENT)
3034                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3035
3036         if (network_file) {
3037                 Network *network;
3038                 char *suffix;
3039
3040                 /* drop suffix */
3041                 suffix = strrchr(network_file, '.');
3042                 if (!suffix) {
3043                         log_link_debug(link, "Failed to get network name from %s", network_file);
3044                         goto network_file_fail;
3045                 }
3046                 *suffix = '\0';
3047
3048                 r = network_get_by_name(link->manager, basename(network_file), &network);
3049                 if (r < 0) {
3050                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3051                         goto network_file_fail;
3052                 }
3053
3054                 r = network_apply(network, link);
3055                 if (r < 0)
3056                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3057         }
3058
3059 network_file_fail:
3060
3061         if (addresses) {
3062                 p = addresses;
3063
3064                 for (;;) {
3065                         _cleanup_free_ char *address_str = NULL;
3066                         char *prefixlen_str;
3067                         int family;
3068                         unsigned char prefixlen;
3069
3070                         r = extract_first_word(&p, &address_str, NULL, 0);
3071                         if (r < 0) {
3072                                 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3073                                 continue;
3074                         }
3075                         if (r == 0)
3076                                 break;
3077
3078                         prefixlen_str = strchr(address_str, '/');
3079                         if (!prefixlen_str) {
3080                                 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3081                                 continue;
3082                         }
3083
3084                         *prefixlen_str++ = '\0';
3085
3086                         r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3087                         if (r != 1) {
3088                                 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3089                                 continue;
3090                         }
3091
3092                         r = in_addr_from_string_auto(address_str, &family, &address);
3093                         if (r < 0) {
3094                                 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3095                                 continue;
3096                         }
3097
3098                         r = address_add(link, family, &address, prefixlen, NULL);
3099                         if (r < 0)
3100                                 return log_link_error_errno(link, r, "Failed to add address: %m");
3101                 }
3102         }
3103
3104         if (routes) {
3105                 p = routes;
3106
3107                 for (;;) {
3108                         Route *route;
3109                         _cleanup_free_ char *route_str = NULL;
3110                         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3111                         usec_t lifetime;
3112                         char *prefixlen_str;
3113                         int family;
3114                         unsigned char prefixlen, tos, table;
3115                         uint32_t priority;
3116
3117                         r = extract_first_word(&p, &route_str, NULL, 0);
3118                         if (r < 0) {
3119                                 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3120                                 continue;
3121                         }
3122                         if (r == 0)
3123                                 break;
3124
3125                         prefixlen_str = strchr(route_str, '/');
3126                         if (!prefixlen_str) {
3127                                 log_link_debug(link, "Failed to parse route %s", route_str);
3128                                 continue;
3129                         }
3130
3131                         *prefixlen_str++ = '\0';
3132
3133                         r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%hhu/"USEC_FMT, &prefixlen, &tos, &priority, &table, &lifetime);
3134                         if (r != 5) {
3135                                 log_link_debug(link,
3136                                                "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3137                                                prefixlen_str);
3138                                 continue;
3139                         }
3140
3141                         r = in_addr_from_string_auto(route_str, &family, &route_dst);
3142                         if (r < 0) {
3143                                 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3144                                 continue;
3145                         }
3146
3147                         r = route_add(link, family, &route_dst, prefixlen, tos, priority, table, &route);
3148                         if (r < 0)
3149                                 return log_link_error_errno(link, r, "Failed to add route: %m");
3150
3151                         if (lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3152                                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), lifetime,
3153                                                       0, route_expire_handler, route);
3154                                 if (r < 0)
3155                                         log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3156                         }
3157
3158                         route->lifetime = lifetime;
3159                         sd_event_source_unref(route->expire);
3160                         route->expire = TAKE_PTR(expire);
3161                 }
3162         }
3163
3164         if (dhcp4_address) {
3165                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3166                 if (r < 0) {
3167                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3168                         goto dhcp4_address_fail;
3169                 }
3170
3171                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3172                 if (r < 0)
3173                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3174
3175                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3176                 if (r < 0)
3177                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3178         }
3179
3180 dhcp4_address_fail:
3181
3182         if (ipv4ll_address) {
3183                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3184                 if (r < 0) {
3185                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3186                         goto ipv4ll_address_fail;
3187                 }
3188
3189                 r = sd_ipv4ll_new(&link->ipv4ll);
3190                 if (r < 0)
3191                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3192
3193                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3194                 if (r < 0)
3195                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3196         }
3197
3198 ipv4ll_address_fail:
3199
3200         return 0;
3201 }
3202
3203 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3204         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3205         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3206         Link *link;
3207         int r;
3208
3209         assert(m);
3210         assert(m->rtnl);
3211         assert(message);
3212         assert(ret);
3213
3214         r = link_new(m, message, ret);
3215         if (r < 0)
3216                 return r;
3217
3218         link = *ret;
3219
3220         log_link_debug(link, "Link %d added", link->ifindex);
3221
3222         r = link_load(link);
3223         if (r < 0)
3224                 return r;
3225
3226         if (detect_container() <= 0) {
3227                 /* not in a container, udev will be around */
3228                 sprintf(ifindex_str, "n%d", link->ifindex);
3229                 r = sd_device_new_from_device_id(&device, ifindex_str);
3230                 if (r < 0) {
3231                         log_link_warning_errno(link, r, "Could not find device: %m");
3232                         goto failed;
3233                 }
3234
3235                 r = sd_device_get_is_initialized(device);
3236                 if (r < 0) {
3237                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized or not: %m");
3238                         goto failed;
3239                 }
3240                 if (r == 0) {
3241                         /* not yet ready */
3242                         log_link_debug(link, "link pending udev initialization...");
3243                         return 0;
3244                 }
3245
3246                 r = device_is_renaming(device);
3247                 if (r < 0) {
3248                         log_link_warning_errno(link, r, "Failed to determine the device is renamed or not: %m");
3249                         goto failed;
3250                 }
3251                 if (r > 0) {
3252                         log_link_debug(link, "Interface is under renaming, pending initialization.");
3253                         return 0;
3254                 }
3255
3256                 r = link_initialized(link, device);
3257                 if (r < 0)
3258                         goto failed;
3259         } else {
3260                 r = link_initialized_and_synced(link);
3261                 if (r < 0)
3262                         goto failed;
3263         }
3264
3265         return 0;
3266 failed:
3267         link_enter_failed(link);
3268         return r;
3269 }
3270
3271 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3272         int r;
3273
3274         assert(link);
3275
3276         log_link_info(link, "Gained IPv6LL");
3277
3278         link->ipv6ll_address = *address;
3279         link_check_ready(link);
3280
3281         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3282                 r = link_acquire_ipv6_conf(link);
3283                 if (r < 0) {
3284                         link_enter_failed(link);
3285                         return r;
3286                 }
3287         }
3288
3289         return 0;
3290 }
3291
3292 static int link_carrier_gained(Link *link) {
3293         int r;
3294
3295         assert(link);
3296
3297         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3298                 r = link_acquire_conf(link);
3299                 if (r < 0) {
3300                         link_enter_failed(link);
3301                         return r;
3302                 }
3303
3304                 r = link_request_set_addresses(link);
3305                 if (r < 0)
3306                         return r;
3307         }
3308
3309         r = link_handle_bound_by_list(link);
3310         if (r < 0)
3311                 return r;
3312
3313         return 0;
3314 }
3315
3316 static int link_carrier_lost(Link *link) {
3317         int r;
3318
3319         assert(link);
3320
3321         if (link->network && link->network->ignore_carrier_loss)
3322                 return 0;
3323
3324         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3325          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3326          * configuration and stop the clients as well. */
3327         if (link->setting_mtu)
3328                 return 0;
3329
3330         r = link_stop_clients(link, false);
3331         if (r < 0) {
3332                 link_enter_failed(link);
3333                 return r;
3334         }
3335
3336         if (link_dhcp4_server_enabled(link))
3337                 (void) sd_dhcp_server_stop(link->dhcp_server);
3338
3339         r = link_drop_config(link);
3340         if (r < 0)
3341                 return r;
3342
3343         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING)) {
3344                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3345                 r = link_drop_foreign_config(link);
3346                 if (r < 0)
3347                         return r;
3348         }
3349
3350         r = link_handle_bound_by_list(link);
3351         if (r < 0)
3352                 return r;
3353
3354         return 0;
3355 }
3356
3357 int link_carrier_reset(Link *link) {
3358         int r;
3359
3360         assert(link);
3361
3362         if (link_has_carrier(link)) {
3363                 r = link_carrier_lost(link);
3364                 if (r < 0)
3365                         return r;
3366
3367                 r = link_carrier_gained(link);
3368                 if (r < 0)
3369                         return r;
3370
3371                 log_link_info(link, "Reset carrier");
3372         }
3373
3374         return 0;
3375 }
3376
3377 int link_update(Link *link, sd_netlink_message *m) {
3378         struct ether_addr mac;
3379         const char *ifname;
3380         uint32_t mtu;
3381         bool had_carrier, carrier_gained, carrier_lost;
3382         int old_master, r;
3383
3384         assert(link);
3385         assert(link->ifname);
3386         assert(m);
3387
3388         if (link->state == LINK_STATE_LINGER) {
3389                 log_link_info(link, "Link re-added");
3390                 link_set_state(link, LINK_STATE_CONFIGURING);
3391
3392                 r = link_new_carrier_maps(link);
3393                 if (r < 0)
3394                         return r;
3395         }
3396
3397         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3398         if (r >= 0 && !streq(ifname, link->ifname)) {
3399                 Manager *manager = link->manager;
3400
3401                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3402
3403                 link_drop(link);
3404                 r = link_add(manager, m, &link);
3405                 if (r < 0)
3406                         return r;
3407         }
3408
3409         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3410         if (r >= 0 && mtu > 0) {
3411                 link->mtu = mtu;
3412                 if (link->original_mtu == 0) {
3413                         link->original_mtu = mtu;
3414                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3415                 }
3416
3417                 if (link->dhcp_client) {
3418                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3419                                                    link->mtu);
3420                         if (r < 0)
3421                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3422                 }
3423
3424                 if (link->radv) {
3425                         r = sd_radv_set_mtu(link->radv, link->mtu);
3426                         if (r < 0)
3427                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3428                 }
3429         }
3430
3431         /* The kernel may broadcast NEWLINK messages without the MAC address
3432            set, simply ignore them. */
3433         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3434         if (r >= 0) {
3435                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3436                            ETH_ALEN)) {
3437
3438                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3439                                ETH_ALEN);
3440
3441                         log_link_debug(link, "MAC address: "
3442                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3443                                        mac.ether_addr_octet[0],
3444                                        mac.ether_addr_octet[1],
3445                                        mac.ether_addr_octet[2],
3446                                        mac.ether_addr_octet[3],
3447                                        mac.ether_addr_octet[4],
3448                                        mac.ether_addr_octet[5]);
3449
3450                         if (link->ipv4ll) {
3451                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3452                                 if (r < 0)
3453                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3454                         }
3455
3456                         if (link->dhcp_client) {
3457                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3458                                                            (const uint8_t *) &link->mac,
3459                                                            sizeof (link->mac),
3460                                                            ARPHRD_ETHER);
3461                                 if (r < 0)
3462                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3463
3464                                 r = dhcp4_set_client_identifier(link);
3465                                 if (r < 0)
3466                                         return r;
3467                         }
3468
3469                         if (link->dhcp6_client) {
3470                                 const DUID* duid = link_get_duid(link);
3471
3472                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3473                                                             (const uint8_t *) &link->mac,
3474                                                             sizeof (link->mac),
3475                                                             ARPHRD_ETHER);
3476                                 if (r < 0)
3477                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3478
3479                                 if (link->network->iaid_set) {
3480                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3481                                                                      link->network->iaid);
3482                                         if (r < 0)
3483                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3484                                 }
3485
3486                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3487                                                              duid->type,
3488                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3489                                                              duid->raw_data_len);
3490                                 if (r < 0)
3491                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3492                         }
3493
3494                         if (link->radv) {
3495                                 r = sd_radv_set_mac(link->radv, &link->mac);
3496                                 if (r < 0)
3497                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3498                         }
3499
3500                         if (link->ndisc) {
3501                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3502                                 if (r < 0)
3503                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3504                         }
3505                 }
3506         }
3507
3508         old_master = link->master_ifindex;
3509         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3510
3511         had_carrier = link_has_carrier(link);
3512
3513         r = link_update_flags(link, m, old_master != link->master_ifindex);
3514         if (r < 0)
3515                 return r;
3516
3517         r = link_update_lldp(link);
3518         if (r < 0)
3519                 return r;
3520
3521         carrier_gained = !had_carrier && link_has_carrier(link);
3522         carrier_lost = had_carrier && !link_has_carrier(link);
3523
3524         if (carrier_gained) {
3525                 log_link_info(link, "Gained carrier");
3526
3527                 r = link_carrier_gained(link);
3528                 if (r < 0)
3529                         return r;
3530         } else if (carrier_lost) {
3531                 log_link_info(link, "Lost carrier");
3532
3533                 r = link_carrier_lost(link);
3534                 if (r < 0)
3535                         return r;
3536         }
3537
3538         return 0;
3539 }
3540
3541 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3542         bool space = false;
3543         Iterator i;
3544         Link *link;
3545
3546         assert(f);
3547         assert(prefix);
3548
3549         if (hashmap_isempty(h))
3550                 return;
3551
3552         fputs(prefix, f);
3553         HASHMAP_FOREACH(link, h, i) {
3554                 if (space)
3555                         fputc(' ', f);
3556
3557                 fprintf(f, "%i", link->ifindex);
3558                 space = true;
3559         }
3560
3561         fputc('\n', f);
3562 }
3563
3564 int link_save(Link *link) {
3565         _cleanup_free_ char *temp_path = NULL;
3566         _cleanup_fclose_ FILE *f = NULL;
3567         const char *admin_state, *oper_state;
3568         Address *a;
3569         Route *route;
3570         Iterator i;
3571         int r;
3572
3573         assert(link);
3574         assert(link->state_file);
3575         assert(link->lease_file);
3576         assert(link->manager);
3577
3578         if (link->state == LINK_STATE_LINGER) {
3579                 (void) unlink(link->state_file);
3580                 return 0;
3581         }
3582
3583         link_lldp_save(link);
3584
3585         admin_state = link_state_to_string(link->state);
3586         assert(admin_state);
3587
3588         oper_state = link_operstate_to_string(link->operstate);
3589         assert(oper_state);
3590
3591         r = fopen_temporary(link->state_file, &f, &temp_path);
3592         if (r < 0)
3593                 goto fail;
3594
3595         (void) fchmod(fileno(f), 0644);
3596
3597         fprintf(f,
3598                 "# This is private data. Do not parse.\n"
3599                 "ADMIN_STATE=%s\n"
3600                 "OPER_STATE=%s\n",
3601                 admin_state, oper_state);
3602
3603         if (link->network) {
3604                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
3605                 const char *dhcp_domainname = NULL, *p;
3606                 sd_dhcp6_lease *dhcp6_lease = NULL;
3607                 unsigned j;
3608                 bool space;
3609
3610                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
3611                         yes_no(link->network->required_for_online));
3612
3613                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s\n",
3614                         strempty(link_operstate_to_string(link->network->required_operstate_for_online)));
3615
3616                 if (link->dhcp6_client) {
3617                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
3618                         if (r < 0 && r != -ENOMSG)
3619                                 log_link_debug(link, "No DHCPv6 lease");
3620                 }
3621
3622                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
3623
3624                 fputs("DNS=", f);
3625                 space = false;
3626
3627                 for (j = 0; j < link->network->n_dns; j++) {
3628                         _cleanup_free_ char *b = NULL;
3629
3630                         r = in_addr_to_string(link->network->dns[j].family,
3631                                               &link->network->dns[j].address,  &b);
3632                         if (r < 0) {
3633                                 log_debug_errno(r, "Failed to format address, ignoring: %m");
3634                                 continue;
3635                         }
3636
3637                         if (space)
3638                                 fputc(' ', f);
3639                         fputs(b, f);
3640                         space = true;
3641                 }
3642
3643                 if (link->network->dhcp_use_dns &&
3644                     link->dhcp_lease) {
3645                         const struct in_addr *addresses;
3646
3647                         r = sd_dhcp_lease_get_dns(link->dhcp_lease, &addresses);
3648                         if (r > 0)
3649                                 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3650                                         space = true;
3651                 }
3652
3653                 if (link->network->dhcp_use_dns && dhcp6_lease) {
3654                         struct in6_addr *in6_addrs;
3655
3656                         r = sd_dhcp6_lease_get_dns(dhcp6_lease, &in6_addrs);
3657                         if (r > 0) {
3658                                 if (space)
3659                                         fputc(' ', f);
3660                                 serialize_in6_addrs(f, in6_addrs, r);
3661                                 space = true;
3662                         }
3663                 }
3664
3665                 /* Make sure to flush out old entries before we use the NDISC data */
3666                 ndisc_vacuum(link);
3667
3668                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
3669                         NDiscRDNSS *dd;
3670
3671                         SET_FOREACH(dd, link->ndisc_rdnss, i) {
3672                                 if (space)
3673                                         fputc(' ', f);
3674
3675                                 serialize_in6_addrs(f, &dd->address, 1);
3676                                 space = true;
3677                         }
3678                 }
3679
3680                 fputc('\n', f);
3681
3682                 fputs("NTP=", f);
3683                 space = false;
3684                 fputstrv(f, link->network->ntp, NULL, &space);
3685
3686                 if (link->network->dhcp_use_ntp &&
3687                     link->dhcp_lease) {
3688                         const struct in_addr *addresses;
3689
3690                         r = sd_dhcp_lease_get_ntp(link->dhcp_lease, &addresses);
3691                         if (r > 0)
3692                                 if (serialize_in_addrs(f, addresses, r, space, in4_addr_is_non_local) > 0)
3693                                         space = true;
3694                 }
3695
3696                 if (link->network->dhcp_use_ntp && dhcp6_lease) {
3697                         struct in6_addr *in6_addrs;
3698                         char **hosts;
3699
3700                         r = sd_dhcp6_lease_get_ntp_addrs(dhcp6_lease,
3701                                                          &in6_addrs);
3702                         if (r > 0) {
3703                                 if (space)
3704                                         fputc(' ', f);
3705                                 serialize_in6_addrs(f, in6_addrs, r);
3706                                 space = true;
3707                         }
3708
3709                         r = sd_dhcp6_lease_get_ntp_fqdn(dhcp6_lease, &hosts);
3710                         if (r > 0)
3711                                 fputstrv(f, hosts, NULL, &space);
3712                 }
3713
3714                 fputc('\n', f);
3715
3716                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
3717                         if (link->dhcp_lease) {
3718                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
3719                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
3720                         }
3721                         if (dhcp6_lease)
3722                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
3723                 }
3724
3725                 fputs("DOMAINS=", f);
3726                 space = false;
3727                 ORDERED_SET_FOREACH(p, link->network->search_domains, i)
3728                         fputs_with_space(f, p, NULL, &space);
3729
3730                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
3731                         NDiscDNSSL *dd;
3732
3733                         if (dhcp_domainname)
3734                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
3735                         if (dhcp_domains)
3736                                 fputstrv(f, dhcp_domains, NULL, &space);
3737                         if (dhcp6_domains)
3738                                 fputstrv(f, dhcp6_domains, NULL, &space);
3739
3740                         SET_FOREACH(dd, link->ndisc_dnssl, i)
3741                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3742                 }
3743
3744                 fputc('\n', f);
3745
3746                 fputs("ROUTE_DOMAINS=", f);
3747                 space = false;
3748                 ORDERED_SET_FOREACH(p, link->network->route_domains, i)
3749                         fputs_with_space(f, p, NULL, &space);
3750
3751                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
3752                         NDiscDNSSL *dd;
3753
3754                         if (dhcp_domainname)
3755                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
3756                         if (dhcp_domains)
3757                                 fputstrv(f, dhcp_domains, NULL, &space);
3758                         if (dhcp6_domains)
3759                                 fputstrv(f, dhcp6_domains, NULL, &space);
3760
3761                         SET_FOREACH(dd, link->ndisc_dnssl, i)
3762                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
3763                 }
3764
3765                 fputc('\n', f);
3766
3767                 fprintf(f, "LLMNR=%s\n",
3768                         resolve_support_to_string(link->network->llmnr));
3769                 fprintf(f, "MDNS=%s\n",
3770                         resolve_support_to_string(link->network->mdns));
3771                 if (link->network->dns_default_route >= 0)
3772                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(link->network->dns_default_route));
3773
3774                 if (link->network->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
3775                         fprintf(f, "DNS_OVER_TLS=%s\n",
3776                                 dns_over_tls_mode_to_string(link->network->dns_over_tls_mode));
3777
3778                 if (link->network->dnssec_mode != _DNSSEC_MODE_INVALID)
3779                         fprintf(f, "DNSSEC=%s\n",
3780                                 dnssec_mode_to_string(link->network->dnssec_mode));
3781
3782                 if (!set_isempty(link->network->dnssec_negative_trust_anchors)) {
3783                         const char *n;
3784
3785                         fputs("DNSSEC_NTA=", f);
3786                         space = false;
3787                         SET_FOREACH(n, link->network->dnssec_negative_trust_anchors, i)
3788                                 fputs_with_space(f, n, NULL, &space);
3789                         fputc('\n', f);
3790                 }
3791
3792                 fputs("ADDRESSES=", f);
3793                 space = false;
3794                 SET_FOREACH(a, link->addresses, i) {
3795                         _cleanup_free_ char *address_str = NULL;
3796
3797                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
3798                         if (r < 0)
3799                                 goto fail;
3800
3801                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
3802                         space = true;
3803                 }
3804                 fputc('\n', f);
3805
3806                 fputs("ROUTES=", f);
3807                 space = false;
3808                 SET_FOREACH(route, link->routes, i) {
3809                         _cleanup_free_ char *route_str = NULL;
3810
3811                         r = in_addr_to_string(route->family, &route->dst, &route_str);
3812                         if (r < 0)
3813                                 goto fail;
3814
3815                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
3816                                 space ? " " : "", route_str,
3817                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
3818                         space = true;
3819                 }
3820
3821                 fputc('\n', f);
3822         }
3823
3824         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
3825         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
3826
3827         if (link->dhcp_lease) {
3828                 struct in_addr address;
3829                 const char *tz = NULL;
3830
3831                 assert(link->network);
3832
3833                 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
3834                 if (r >= 0)
3835                         fprintf(f, "TIMEZONE=%s\n", tz);
3836
3837                 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
3838                 if (r >= 0) {
3839                         fputs("DHCP4_ADDRESS=", f);
3840                         serialize_in_addrs(f, &address, 1, false, NULL);
3841                         fputc('\n', f);
3842                 }
3843
3844                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
3845                 if (r < 0)
3846                         goto fail;
3847
3848                 fprintf(f,
3849                         "DHCP_LEASE=%s\n",
3850                         link->lease_file);
3851         } else
3852                 (void) unlink(link->lease_file);
3853
3854         if (link->ipv4ll) {
3855                 struct in_addr address;
3856
3857                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
3858                 if (r >= 0) {
3859                         fputs("IPV4LL_ADDRESS=", f);
3860                         serialize_in_addrs(f, &address, 1, false, NULL);
3861                         fputc('\n', f);
3862                 }
3863         }
3864
3865         r = fflush_and_check(f);
3866         if (r < 0)
3867                 goto fail;
3868
3869         if (rename(temp_path, link->state_file) < 0) {
3870                 r = -errno;
3871                 goto fail;
3872         }
3873
3874         return 0;
3875
3876 fail:
3877         (void) unlink(link->state_file);
3878         if (temp_path)
3879                 (void) unlink(temp_path);
3880
3881         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
3882 }
3883
3884 /* The serialized state in /run is no longer up-to-date. */
3885 void link_dirty(Link *link) {
3886         int r;
3887
3888         assert(link);
3889
3890         /* mark manager dirty as link is dirty */
3891         manager_dirty(link->manager);
3892
3893         r = set_ensure_allocated(&link->manager->dirty_links, NULL);
3894         if (r < 0)
3895                 /* allocation errors are ignored */
3896                 return;
3897
3898         r = set_put(link->manager->dirty_links, link);
3899         if (r <= 0)
3900                 /* don't take another ref if the link was already dirty */
3901                 return;
3902
3903         link_ref(link);
3904 }
3905
3906 /* The serialized state in /run is up-to-date */
3907 void link_clean(Link *link) {
3908         assert(link);
3909         assert(link->manager);
3910
3911         link_unref(set_remove(link->manager->dirty_links, link));
3912 }
3913
3914 static const char* const link_state_table[_LINK_STATE_MAX] = {
3915         [LINK_STATE_PENDING] = "pending",
3916         [LINK_STATE_INITIALIZED] = "initialized",
3917         [LINK_STATE_CONFIGURING] = "configuring",
3918         [LINK_STATE_CONFIGURED] = "configured",
3919         [LINK_STATE_UNMANAGED] = "unmanaged",
3920         [LINK_STATE_FAILED] = "failed",
3921         [LINK_STATE_LINGER] = "linger",
3922 };
3923
3924 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);