src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <net/if.h>
   4 #include <netinet/in.h>
   5 #include <linux/if.h>
   6 #include <linux/if_arp.h>
   7 #include <linux/if_link.h>
   8 #include <linux/netdevice.h>
   9 #include <sys/socket.h>
  10 #include <unistd.h>
  11
  12 #include "alloc-util.h"
  13 #include "arphrd-util.h"
  14 #include "batadv.h"
  15 #include "bond.h"
  16 #include "bridge.h"
  17 #include "bus-util.h"
  18 #include "device-private.h"
  19 #include "device-util.h"
  20 #include "dhcp-identifier.h"
  21 #include "dhcp-lease-internal.h"
  22 #include "env-file.h"
  23 #include "ethtool-util.h"
  24 #include "event-util.h"
  25 #include "fd-util.h"
  26 #include "fileio.h"
  27 #include "format-util.h"
  28 #include "fs-util.h"
  29 #include "ipvlan.h"
  30 #include "missing_network.h"
  31 #include "netlink-util.h"
  32 #include "network-internal.h"
  33 #include "networkd-address-label.h"
  34 #include "networkd-address.h"
  35 #include "networkd-bridge-fdb.h"
  36 #include "networkd-bridge-mdb.h"
  37 #include "networkd-can.h"
  38 #include "networkd-dhcp-prefix-delegation.h"
  39 #include "networkd-dhcp-server.h"
  40 #include "networkd-dhcp4.h"
  41 #include "networkd-dhcp6.h"
  42 #include "networkd-ipv4acd.h"
  43 #include "networkd-ipv4ll.h"
  44 #include "networkd-ipv6-proxy-ndp.h"
  45 #include "networkd-link-bus.h"
  46 #include "networkd-link.h"
  47 #include "networkd-lldp-tx.h"
  48 #include "networkd-manager.h"
  49 #include "networkd-ndisc.h"
  50 #include "networkd-neighbor.h"
  51 #include "networkd-nexthop.h"
  52 #include "networkd-queue.h"
  53 #include "networkd-radv.h"
  54 #include "networkd-route.h"
  55 #include "networkd-routing-policy-rule.h"
  56 #include "networkd-setlink.h"
  57 #include "networkd-sriov.h"
  58 #include "networkd-state-file.h"
  59 #include "networkd-sysctl.h"
  60 #include "set.h"
  61 #include "socket-util.h"
  62 #include "stat-util.h"
  63 #include "stdio-util.h"
  64 #include "string-table.h"
  65 #include "strv.h"
  66 #include "tc.h"
  67 #include "tmpfile-util.h"
  68 #include "udev-util.h"
  69 #include "util.h"
  70 #include "vrf.h"
  71
  72 bool link_ipv4ll_enabled(Link *link) {
  73         assert(link);
  74
  75         if (link->flags & IFF_LOOPBACK)
  76                 return false;
  77
  78         if (!link->network)
  79                 return false;
  80
  81         if (link->iftype == ARPHRD_CAN)
  82                 return false;
  83
  84         if (link->hw_addr.length != ETH_ALEN)
  85                 return false;
  86
  87         if (ether_addr_is_null(&link->hw_addr.ether))
  88                 return false;
  89
  90         /* ARPHRD_INFINIBAND seems to potentially support IPv4LL.
  91          * But currently sd-ipv4ll and sd-ipv4acd only support ARPHRD_ETHER. */
  92         if (link->iftype != ARPHRD_ETHER)
  93                 return false;
  94
  95         if (streq_ptr(link->kind, "vrf"))
  96                 return false;
  97
  98         /* L3 or L3S mode do not support ARP. */
  99         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 100                 return false;
 101
 102         if (link->network->bond)
 103                 return false;
 104
 105         return link->network->link_local & ADDRESS_FAMILY_IPV4;
 106 }
 107
 108 bool link_ipv6_enabled(Link *link) {
 109         assert(link);
 110
 111         if (!socket_ipv6_is_supported())
 112                 return false;
 113
 114         if (link->network->bond)
 115                 return false;
 116
 117         if (link->iftype == ARPHRD_CAN)
 118                 return false;
 119
 120         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 121         if (link_ipv6ll_enabled(link))
 122                 return true;
 123
 124         if (network_has_static_ipv6_configurations(link->network))
 125                 return true;
 126
 127         return false;
 128 }
 129
 130 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
 131         assert(link);
 132
 133         if (!link->network) {
 134                 if (!allow_unmanaged)
 135                         return false;
 136
 137                 return link_has_carrier(link);
 138         }
 139
 140         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 141                 return false;
 142
 143         if (!link->network->configure_without_carrier) {
 144                 if (link->set_flags_messages > 0)
 145                         return false;
 146
 147                 if (!link_has_carrier(link))
 148                         return false;
 149         }
 150
 151         if (link->set_link_messages > 0)
 152                 return false;
 153
 154         if (!link->activated)
 155                 return false;
 156
 157         return true;
 158 }
 159
 160 void link_ntp_settings_clear(Link *link) {
 161         link->ntp = strv_free(link->ntp);
 162 }
 163
 164 void link_dns_settings_clear(Link *link) {
 165         if (link->n_dns != UINT_MAX)
 166                 for (unsigned i = 0; i < link->n_dns; i++)
 167                         in_addr_full_free(link->dns[i]);
 168         link->dns = mfree(link->dns);
 169         link->n_dns = UINT_MAX;
 170
 171         link->search_domains = ordered_set_free(link->search_domains);
 172         link->route_domains = ordered_set_free(link->route_domains);
 173
 174         link->dns_default_route = -1;
 175         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 176         link->mdns = _RESOLVE_SUPPORT_INVALID;
 177         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 178         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 179
 180         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 181 }
 182
 183 static void link_free_engines(Link *link) {
 184         if (!link)
 185                 return;
 186
 187         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 188         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 189         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 190         link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
 191
 192         link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
 193         link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
 194
 195         ndisc_flush(link);
 196
 197         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 198         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 199         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 200         link->ndisc = sd_ndisc_unref(link->ndisc);
 201         link->radv = sd_radv_unref(link->radv);
 202 }
 203
 204 static Link *link_free(Link *link) {
 205         assert(link);
 206
 207         link_ntp_settings_clear(link);
 208         link_dns_settings_clear(link);
 209
 210         link->routes = set_free(link->routes);
 211         link->nexthops = set_free(link->nexthops);
 212         link->neighbors = set_free(link->neighbors);
 213         link->addresses = set_free(link->addresses);
 214         link->traffic_control = set_free(link->traffic_control);
 215
 216         link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
 217
 218         link_free_engines(link);
 219
 220         free(link->ifname);
 221         strv_free(link->alternative_names);
 222         free(link->kind);
 223         free(link->ssid);
 224         free(link->previous_ssid);
 225         free(link->driver);
 226
 227         unlink_and_free(link->lease_file);
 228         unlink_and_free(link->lldp_file);
 229         unlink_and_free(link->state_file);
 230
 231         sd_device_unref(link->sd_device);
 232
 233         hashmap_free(link->bound_to_links);
 234         hashmap_free(link->bound_by_links);
 235
 236         set_free_with_destructor(link->slaves, link_unref);
 237
 238         network_unref(link->network);
 239
 240         sd_event_source_disable_unref(link->carrier_lost_timer);
 241
 242         return mfree(link);
 243 }
 244
 245 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 246
 247 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
 248         Link *link;
 249
 250         assert(m);
 251         assert(ifindex > 0);
 252
 253         link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
 254         if (!link)
 255                 return -ENODEV;
 256
 257         if (ret)
 258                 *ret = link;
 259         return 0;
 260 }
 261
 262 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
 263         Link *link;
 264
 265         assert(m);
 266         assert(ifname);
 267
 268         link = hashmap_get(m->links_by_name, ifname);
 269         if (!link)
 270                 return -ENODEV;
 271
 272         if (ret)
 273                 *ret = link;
 274         return 0;
 275 }
 276
 277 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
 278         Link *link;
 279
 280         assert(m);
 281         assert(hw_addr);
 282
 283         link = hashmap_get(m->links_by_hw_addr, hw_addr);
 284         if (!link)
 285                 return -ENODEV;
 286
 287         if (ret)
 288                 *ret = link;
 289         return 0;
 290 }
 291
 292 int link_get_master(Link *link, Link **ret) {
 293         assert(link);
 294         assert(link->manager);
 295         assert(ret);
 296
 297         if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
 298                 return -ENODEV;
 299
 300         return link_get_by_index(link->manager, link->master_ifindex, ret);
 301 }
 302
 303 void link_set_state(Link *link, LinkState state) {
 304         assert(link);
 305
 306         if (link->state == state)
 307                 return;
 308
 309         log_link_debug(link, "State changed: %s -> %s",
 310                        link_state_to_string(link->state),
 311                        link_state_to_string(state));
 312
 313         link->state = state;
 314
 315         link_send_changed(link, "AdministrativeState", NULL);
 316         link_dirty(link);
 317 }
 318
 319 int link_stop_engines(Link *link, bool may_keep_dhcp) {
 320         int r = 0, k;
 321
 322         assert(link);
 323         assert(link->manager);
 324         assert(link->manager->event);
 325
 326         bool keep_dhcp = may_keep_dhcp &&
 327                          link->network &&
 328                          !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
 329                          (link->manager->restarting ||
 330                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 331
 332         if (!keep_dhcp) {
 333                 k = sd_dhcp_client_stop(link->dhcp_client);
 334                 if (k < 0)
 335                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 336         }
 337
 338         k = sd_dhcp_server_stop(link->dhcp_server);
 339         if (k < 0)
 340                 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
 341
 342         k = sd_lldp_rx_stop(link->lldp_rx);
 343         if (k < 0)
 344                 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
 345
 346         k = sd_lldp_tx_stop(link->lldp_tx);
 347         if (k < 0)
 348                 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
 349
 350         k = sd_ipv4ll_stop(link->ipv4ll);
 351         if (k < 0)
 352                 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 353
 354         k = ipv4acd_stop(link);
 355         if (k < 0)
 356                 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 357
 358         k = sd_dhcp6_client_stop(link->dhcp6_client);
 359         if (k < 0)
 360                 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 361
 362         k = dhcp_pd_remove(link, /* only_marked = */ false);
 363         if (k < 0)
 364                 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 365
 366         k = sd_ndisc_stop(link->ndisc);
 367         if (k < 0)
 368                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 369
 370         ndisc_flush(link);
 371
 372         k = sd_radv_stop(link->radv);
 373         if (k < 0)
 374                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 375
 376         return r;
 377 }
 378
 379 void link_enter_failed(Link *link) {
 380         assert(link);
 381
 382         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 383                 return;
 384
 385         log_link_warning(link, "Failed");
 386
 387         link_set_state(link, LINK_STATE_FAILED);
 388
 389         (void) link_stop_engines(link, false);
 390 }
 391
 392 void link_check_ready(Link *link) {
 393         Address *a;
 394
 395         assert(link);
 396
 397         if (link->state == LINK_STATE_CONFIGURED)
 398                 return;
 399
 400         if (link->state != LINK_STATE_CONFIGURING)
 401                 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
 402
 403         if (!link->network)
 404                 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
 405
 406         if (!link->tc_configured)
 407                 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
 408
 409         if (link->set_link_messages > 0)
 410                 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
 411
 412         if (!link->activated)
 413                 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
 414
 415         if (link->iftype == ARPHRD_CAN) {
 416                 /* let's shortcut things for CAN which doesn't need most of checks below. */
 417                 link_set_state(link, LINK_STATE_CONFIGURED);
 418                 return;
 419         }
 420
 421         if (!link->stacked_netdevs_created)
 422                 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
 423
 424         if (!link->static_addresses_configured)
 425                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 426
 427         SET_FOREACH(a, link->addresses)
 428                 if (!address_is_ready(a)) {
 429                         _cleanup_free_ char *str = NULL;
 430
 431                         (void) in_addr_prefix_to_string(a->family, &a->in_addr, a->prefixlen, &str);
 432                         return (void) log_link_debug(link, "%s(): address %s is not ready.", __func__, strna(str));
 433                 }
 434
 435         if (!link->static_address_labels_configured)
 436                 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
 437
 438         if (!link->static_bridge_fdb_configured)
 439                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 440
 441         if (!link->static_bridge_mdb_configured)
 442                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 443
 444         if (!link->static_ipv6_proxy_ndp_configured)
 445                 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
 446
 447         if (!link->static_neighbors_configured)
 448                 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
 449
 450         if (!link->static_nexthops_configured)
 451                 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
 452
 453         if (!link->static_routes_configured)
 454                 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
 455
 456         if (!link->static_routing_policy_rules_configured)
 457                 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
 458
 459         if (!link->sr_iov_configured)
 460                 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
 461
 462         /* IPv6LL is assigned after the link gains its carrier. */
 463         if (!link->network->configure_without_carrier &&
 464             link_ipv6ll_enabled(link) &&
 465             !in6_addr_is_set(&link->ipv6ll_address))
 466                 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
 467
 468         bool has_dynamic_address = false;
 469         SET_FOREACH(a, link->addresses) {
 470                 if (address_is_marked(a))
 471                         continue;
 472                 if (!address_exists(a))
 473                         continue;
 474                 if (IN_SET(a->source,
 475                            NETWORK_CONFIG_SOURCE_IPV4LL,
 476                            NETWORK_CONFIG_SOURCE_DHCP4,
 477                            NETWORK_CONFIG_SOURCE_DHCP6,
 478                            NETWORK_CONFIG_SOURCE_DHCP_PD,
 479                            NETWORK_CONFIG_SOURCE_NDISC)) {
 480                         has_dynamic_address = true;
 481                         break;
 482                 }
 483         }
 484
 485         if ((link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) ||
 486              (link_dhcp_pd_is_enabled(link) && link->network->dhcp_pd_assign)) && !has_dynamic_address)
 487                 /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
 488                 return (void) log_link_debug(link, "%s(): DHCPv4, DHCPv6, DHCP-PD or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
 489
 490         /* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
 491         if (link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) ||
 492             link_dhcp6_enabled(link) || link_dhcp_pd_is_enabled(link) ||
 493             (!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link))) {
 494
 495                 if (!link->ipv4ll_address_configured && !link->dhcp4_configured &&
 496                     !link->dhcp6_configured && !link->dhcp_pd_configured && !link->ndisc_configured)
 497                         /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
 498                         return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
 499
 500                 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
 501                                __func__,
 502                                yes_no(link->ipv4ll_address_configured),
 503                                yes_no(link->dhcp4_configured),
 504                                yes_no(link->dhcp6_configured),
 505                                yes_no(link->dhcp_pd_configured),
 506                                yes_no(link->ndisc_configured));
 507         }
 508
 509         link_set_state(link, LINK_STATE_CONFIGURED);
 510 }
 511
 512 static int link_request_static_configs(Link *link) {
 513         int r;
 514
 515         assert(link);
 516         assert(link->network);
 517         assert(link->state != _LINK_STATE_INVALID);
 518
 519         r = link_request_static_addresses(link);
 520         if (r < 0)
 521                 return r;
 522
 523         r = link_request_static_address_labels(link);
 524         if (r < 0)
 525                 return r;
 526
 527         r = link_request_static_bridge_fdb(link);
 528         if (r < 0)
 529                 return r;
 530
 531         r = link_request_static_bridge_mdb(link);
 532         if (r < 0)
 533                 return r;
 534
 535         r = link_request_static_ipv6_proxy_ndp_addresses(link);
 536         if (r < 0)
 537                 return r;
 538
 539         r = link_request_static_neighbors(link);
 540         if (r < 0)
 541                 return r;
 542
 543         r = link_request_static_nexthops(link, false);
 544         if (r < 0)
 545                 return r;
 546
 547         r = link_request_static_routes(link, false);
 548         if (r < 0)
 549                 return r;
 550
 551         r = link_request_static_routing_policy_rules(link);
 552         if (r < 0)
 553                 return r;
 554
 555         return 0;
 556 }
 557
 558 static int link_request_stacked_netdevs(Link *link) {
 559         NetDev *netdev;
 560         int r;
 561
 562         assert(link);
 563
 564         link->stacked_netdevs_created = false;
 565         link->stacked_netdevs_after_configured_created = false;
 566
 567         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 568                 r = link_request_stacked_netdev(link, netdev);
 569                 if (r < 0)
 570                         return r;
 571         }
 572
 573         if (link->create_stacked_netdev_messages == 0) {
 574                 link->stacked_netdevs_created = true;
 575                 link_check_ready(link);
 576         }
 577         if (link->create_stacked_netdev_after_configured_messages == 0)
 578                 link->stacked_netdevs_after_configured_created = true;
 579
 580         return 0;
 581 }
 582
 583 static int link_acquire_dynamic_ipv6_conf(Link *link) {
 584         int r;
 585
 586         assert(link);
 587
 588         r = radv_start(link);
 589         if (r < 0)
 590                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 591
 592         r = ndisc_start(link);
 593         if (r < 0)
 594                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 595
 596         r = dhcp6_start(link);
 597         if (r < 0)
 598                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 599
 600         return 0;
 601 }
 602
 603 static int link_acquire_dynamic_ipv4_conf(Link *link) {
 604         int r;
 605
 606         assert(link);
 607         assert(link->manager);
 608         assert(link->manager->event);
 609
 610         if (link->dhcp_client) {
 611                 r = dhcp4_start(link);
 612                 if (r < 0)
 613                         return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
 614
 615                 log_link_debug(link, "Acquiring DHCPv4 lease.");
 616
 617         } else if (link->ipv4ll) {
 618                 r = sd_ipv4ll_start(link->ipv4ll);
 619                 if (r < 0)
 620                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
 621
 622                 log_link_debug(link, "Acquiring IPv4 link-local address.");
 623         }
 624
 625         if (link->dhcp_server) {
 626                 r = sd_dhcp_server_start(link->dhcp_server);
 627                 if (r < 0)
 628                         return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
 629         }
 630
 631         r = ipv4acd_start(link);
 632         if (r < 0)
 633                 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
 634
 635         return 0;
 636 }
 637
 638 static int link_acquire_dynamic_conf(Link *link) {
 639         int r;
 640
 641         assert(link);
 642         assert(link->network);
 643
 644         r = link_acquire_dynamic_ipv4_conf(link);
 645         if (r < 0)
 646                 return r;
 647
 648         if (in6_addr_is_set(&link->ipv6ll_address)) {
 649                 r = link_acquire_dynamic_ipv6_conf(link);
 650                 if (r < 0)
 651                         return r;
 652         }
 653
 654         if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
 655                 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
 656                  * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
 657                  * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
 658                  * below will be called in radv_start(). */
 659                 r = dhcp_request_prefix_delegation(link);
 660                 if (r < 0)
 661                         return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 662         }
 663
 664         if (link->lldp_tx) {
 665                 r = sd_lldp_tx_start(link->lldp_tx);
 666                 if (r < 0)
 667                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
 668         }
 669
 670         if (link->lldp_rx) {
 671                 r = sd_lldp_rx_start(link->lldp_rx);
 672                 if (r < 0)
 673                         return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
 674         }
 675
 676         return 0;
 677 }
 678
 679 int link_ipv6ll_gained(Link *link) {
 680         int r;
 681
 682         assert(link);
 683
 684         log_link_info(link, "Gained IPv6LL");
 685
 686         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 687                 return 0;
 688
 689         r = link_acquire_dynamic_ipv6_conf(link);
 690         if (r < 0)
 691                 return r;
 692
 693         link_check_ready(link);
 694         return 0;
 695 }
 696
 697 int link_handle_bound_to_list(Link *link) {
 698         bool required_up = false;
 699         bool link_is_up = false;
 700         Link *l;
 701
 702         assert(link);
 703
 704         /* If at least one interface in bound_to_links has carrier, then make this interface up.
 705          * If all interfaces in bound_to_links do not, then make this interface down. */
 706
 707         if (hashmap_isempty(link->bound_to_links))
 708                 return 0;
 709
 710         if (link->flags & IFF_UP)
 711                 link_is_up = true;
 712
 713         HASHMAP_FOREACH(l, link->bound_to_links)
 714                 if (link_has_carrier(l)) {
 715                         required_up = true;
 716                         break;
 717                 }
 718
 719         if (!required_up && link_is_up)
 720                 return link_request_to_bring_up_or_down(link, /* up = */ false);
 721         if (required_up && !link_is_up)
 722                 return link_request_to_bring_up_or_down(link, /* up = */ true);
 723
 724         return 0;
 725 }
 726
 727 static int link_handle_bound_by_list(Link *link) {
 728         Link *l;
 729         int r;
 730
 731         assert(link);
 732
 733         /* Update up or down state of interfaces which depend on this interface's carrier state. */
 734
 735         if (hashmap_isempty(link->bound_by_links))
 736                 return 0;
 737
 738         HASHMAP_FOREACH(l, link->bound_by_links) {
 739                 r = link_handle_bound_to_list(l);
 740                 if (r < 0)
 741                         return r;
 742         }
 743
 744         return 0;
 745 }
 746
 747 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
 748         int r;
 749
 750         assert(link);
 751         assert(carrier);
 752
 753         if (link == carrier)
 754                 return 0;
 755
 756         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
 757                 return 0;
 758
 759         r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
 760         if (r < 0)
 761                 return r;
 762
 763         link_dirty(link);
 764
 765         return 0;
 766 }
 767
 768 static int link_new_bound_by_list(Link *link) {
 769         Manager *m;
 770         Link *carrier;
 771         int r;
 772
 773         assert(link);
 774         assert(link->manager);
 775
 776         m = link->manager;
 777
 778         HASHMAP_FOREACH(carrier, m->links_by_index) {
 779                 if (!carrier->network)
 780                         continue;
 781
 782                 if (strv_isempty(carrier->network->bind_carrier))
 783                         continue;
 784
 785                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
 786                         r = link_put_carrier(link, carrier, &link->bound_by_links);
 787                         if (r < 0)
 788                                 return r;
 789                 }
 790         }
 791
 792         HASHMAP_FOREACH(carrier, link->bound_by_links) {
 793                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
 794                 if (r < 0)
 795                         return r;
 796         }
 797
 798         return 0;
 799 }
 800
 801 static int link_new_bound_to_list(Link *link) {
 802         Manager *m;
 803         Link *carrier;
 804         int r;
 805
 806         assert(link);
 807         assert(link->manager);
 808
 809         if (!link->network)
 810                 return 0;
 811
 812         if (strv_isempty(link->network->bind_carrier))
 813                 return 0;
 814
 815         m = link->manager;
 816
 817         HASHMAP_FOREACH(carrier, m->links_by_index) {
 818                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
 819                         r = link_put_carrier(link, carrier, &link->bound_to_links);
 820                         if (r < 0)
 821                                 return r;
 822                 }
 823         }
 824
 825         HASHMAP_FOREACH(carrier, link->bound_to_links) {
 826                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
 827                 if (r < 0)
 828                         return r;
 829         }
 830
 831         return 0;
 832 }
 833
 834 static void link_free_bound_to_list(Link *link) {
 835         bool updated = false;
 836         Link *bound_to;
 837
 838         assert(link);
 839
 840         while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
 841                 updated = true;
 842
 843                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
 844                         link_dirty(bound_to);
 845         }
 846
 847         if (updated)
 848                 link_dirty(link);
 849 }
 850
 851 static void link_free_bound_by_list(Link *link) {
 852         bool updated = false;
 853         Link *bound_by;
 854
 855         assert(link);
 856
 857         while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
 858                 updated = true;
 859
 860                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
 861                         link_dirty(bound_by);
 862                         link_handle_bound_to_list(bound_by);
 863                 }
 864         }
 865
 866         if (updated)
 867                 link_dirty(link);
 868 }
 869
 870 static int link_append_to_master(Link *link) {
 871         Link *master;
 872         int r;
 873
 874         assert(link);
 875
 876         /* - The link may have no master.
 877          * - RTM_NEWLINK message about master interface may not be received yet. */
 878         if (link_get_master(link, &master) < 0)
 879                 return 0;
 880
 881         r = set_ensure_put(&master->slaves, NULL, link);
 882         if (r <= 0)
 883                 return r;
 884
 885         link_ref(link);
 886         return 0;
 887 }
 888
 889 static void link_drop_from_master(Link *link) {
 890         Link *master;
 891
 892         assert(link);
 893
 894         if (!link->manager)
 895                 return;
 896
 897         if (link_get_master(link, &master) < 0)
 898                 return;
 899
 900         link_unref(set_remove(master->slaves, link));
 901 }
 902
 903 static void link_drop_requests(Link *link) {
 904         Request *req;
 905
 906         assert(link);
 907         assert(link->manager);
 908
 909         ORDERED_SET_FOREACH(req, link->manager->request_queue)
 910                 if (req->link == link)
 911                         request_drop(req);
 912 }
 913
 914 static Link *link_drop(Link *link) {
 915         char **n;
 916
 917         if (!link)
 918                 return NULL;
 919
 920         assert(link->manager);
 921
 922         link_set_state(link, LINK_STATE_LINGER);
 923
 924         /* Drop all references from other links and manager. Note that async netlink calls may have
 925          * references to the link, and they will be dropped when we receive replies. */
 926
 927         link_drop_requests(link);
 928
 929         link_free_bound_to_list(link);
 930         link_free_bound_by_list(link);
 931
 932         link_drop_from_master(link);
 933
 934         if (link->state_file)
 935                 (void) unlink(link->state_file);
 936
 937         link_clean(link);
 938
 939         STRV_FOREACH(n, link->alternative_names)
 940                 hashmap_remove(link->manager->links_by_name, *n);
 941         hashmap_remove(link->manager->links_by_name, link->ifname);
 942
 943         /* bonding master and its slaves have the same hardware address. */
 944         hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
 945
 946         /* The following must be called at last. */
 947         assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
 948         return link_unref(link);
 949 }
 950
 951 static int link_drop_foreign_config(Link *link) {
 952         int k, r;
 953
 954         assert(link);
 955         assert(link->manager);
 956
 957         /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
 958          * to remove loopback address or addresses used for root NFS. */
 959
 960         if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
 961                 return 0;
 962         if (FLAGS_SET(link->flags, IFF_LOOPBACK))
 963                 return 0;
 964         if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
 965                 return 0;
 966
 967         r = link_drop_foreign_routes(link);
 968
 969         k = link_drop_foreign_nexthops(link);
 970         if (k < 0 && r >= 0)
 971                 r = k;
 972
 973         k = link_drop_foreign_addresses(link);
 974         if (k < 0 && r >= 0)
 975                 r = k;
 976
 977         k = link_drop_foreign_neighbors(link);
 978         if (k < 0 && r >= 0)
 979                 r = k;
 980
 981         k = manager_drop_foreign_routing_policy_rules(link->manager);
 982         if (k < 0 && r >= 0)
 983                 r = k;
 984
 985         return r;
 986 }
 987
 988 static int link_drop_managed_config(Link *link) {
 989         int k, r;
 990
 991         assert(link);
 992         assert(link->manager);
 993
 994         r = link_drop_managed_routes(link);
 995
 996         k = link_drop_managed_nexthops(link);
 997         if (k < 0 && r >= 0)
 998                 r = k;
 999
1000         k = link_drop_managed_addresses(link);
1001         if (k < 0 && r >= 0)
1002                 r = k;
1003
1004         k = link_drop_managed_neighbors(link);
1005         if (k < 0 && r >= 0)
1006                 r = k;
1007
1008         k = link_drop_managed_routing_policy_rules(link);
1009         if (k < 0 && r >= 0)
1010                 r = k;
1011
1012         return r;
1013 }
1014
1015 static void link_foreignize_config(Link *link) {
1016         assert(link);
1017         assert(link->manager);
1018
1019         link_foreignize_routes(link);
1020         link_foreignize_nexthops(link);
1021         link_foreignize_addresses(link);
1022         link_foreignize_neighbors(link);
1023         link_foreignize_routing_policy_rules(link);
1024 }
1025
1026 static int link_configure(Link *link) {
1027         int r;
1028
1029         assert(link);
1030         assert(link->network);
1031         assert(link->state == LINK_STATE_INITIALIZED);
1032
1033         link_set_state(link, LINK_STATE_CONFIGURING);
1034
1035         r = link_new_bound_to_list(link);
1036         if (r < 0)
1037                 return r;
1038
1039         r = link_request_traffic_control(link);
1040         if (r < 0)
1041                 return r;
1042
1043         if (link->iftype == ARPHRD_CAN) {
1044                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1045                 r = link_request_to_set_can(link);
1046                 if (r < 0)
1047                         return r;
1048
1049                 return link_request_to_activate(link);
1050         }
1051
1052         r = link_configure_sr_iov(link);
1053         if (r < 0)
1054                 return r;
1055
1056         r = link_set_sysctl(link);
1057         if (r < 0)
1058                 return r;
1059
1060         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1061         if (r < 0)
1062                 return r;
1063
1064         r = link_request_to_set_ipoib(link);
1065         if (r < 0)
1066                 return r;
1067
1068         r = link_request_to_set_flags(link);
1069         if (r < 0)
1070                 return r;
1071
1072         r = link_request_to_set_group(link);
1073         if (r < 0)
1074                 return r;
1075
1076         r = link_configure_mtu(link);
1077         if (r < 0)
1078                 return r;
1079
1080         r = link_request_to_set_addrgen_mode(link);
1081         if (r < 0)
1082                 return r;
1083
1084         r = link_request_to_set_master(link);
1085         if (r < 0)
1086                 return r;
1087
1088         r = link_request_stacked_netdevs(link);
1089         if (r < 0)
1090                 return r;
1091
1092         r = link_request_to_set_bond(link);
1093         if (r < 0)
1094                 return r;
1095
1096         r = link_request_to_set_bridge(link);
1097         if (r < 0)
1098                 return r;
1099
1100         r = link_request_to_set_bridge_vlan(link);
1101         if (r < 0)
1102                 return r;
1103
1104         r = link_request_to_activate(link);
1105         if (r < 0)
1106                 return r;
1107
1108         r = ipv4ll_configure(link);
1109         if (r < 0)
1110                 return r;
1111
1112         r = link_request_dhcp4_client(link);
1113         if (r < 0)
1114                 return r;
1115
1116         r = link_request_dhcp6_client(link);
1117         if (r < 0)
1118                 return r;
1119
1120         r = link_request_ndisc(link);
1121         if (r < 0)
1122                 return r;
1123
1124         r = link_request_dhcp_server(link);
1125         if (r < 0)
1126                 return r;
1127
1128         r = link_request_radv(link);
1129         if (r < 0)
1130                 return r;
1131
1132         r = link_lldp_rx_configure(link);
1133         if (r < 0)
1134                 return r;
1135
1136         r = link_lldp_tx_configure(link);
1137         if (r < 0)
1138                 return r;
1139
1140         r = link_drop_foreign_config(link);
1141         if (r < 0)
1142                 return r;
1143
1144         r = link_request_static_configs(link);
1145         if (r < 0)
1146                 return r;
1147
1148         if (!link_has_carrier(link))
1149                 return 0;
1150
1151         return link_acquire_dynamic_conf(link);
1152 }
1153
1154 static int link_get_network(Link *link, Network **ret) {
1155         Network *network;
1156         int r;
1157
1158         assert(link);
1159         assert(link->manager);
1160         assert(ret);
1161
1162         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1163                 bool warn = false;
1164
1165                 r = net_match_config(
1166                                 &network->match,
1167                                 link->sd_device,
1168                                 &link->hw_addr,
1169                                 &link->permanent_hw_addr,
1170                                 link->driver,
1171                                 link->iftype,
1172                                 link->kind,
1173                                 link->ifname,
1174                                 link->alternative_names,
1175                                 link->wlan_iftype,
1176                                 link->ssid,
1177                                 &link->bssid);
1178                 if (r < 0)
1179                         return r;
1180                 if (r == 0)
1181                         continue;
1182
1183                 if (network->match.ifname && link->sd_device) {
1184                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1185                         const char *attr;
1186
1187                         if (sd_device_get_sysattr_value(link->sd_device, "name_assign_type", &attr) >= 0)
1188                                 (void) safe_atou8(attr, &name_assign_type);
1189
1190                         warn = name_assign_type == NET_NAME_ENUM;
1191                 }
1192
1193                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1194                               "found matching network '%s'%s.",
1195                               network->filename,
1196                               warn ? ", based on potentially unpredictable interface name" : "");
1197
1198                 if (network->unmanaged)
1199                         return -ENOENT;
1200
1201                 *ret = network;
1202                 return 0;
1203         }
1204
1205         return -ENOENT;
1206 }
1207
1208 static int link_reconfigure_impl(Link *link, bool force) {
1209         Network *network = NULL;
1210         int r;
1211
1212         assert(link);
1213
1214         if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
1215                 return 0;
1216
1217         r = link_get_network(link, &network);
1218         if (r < 0 && r != -ENOENT)
1219                 return r;
1220
1221         if (link->state != LINK_STATE_UNMANAGED && !network)
1222                 /* If link is in initialized state, then link->network is also NULL. */
1223                 force = true;
1224
1225         if (link->network == network && !force)
1226                 return 0;
1227
1228         if (network) {
1229                 if (link->state == LINK_STATE_INITIALIZED)
1230                         log_link_info(link, "Configuring with %s.", network->filename);
1231                 else
1232                         log_link_info(link, "Reconfiguring with %s.", network->filename);
1233         } else
1234                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1235                               "Unmanaging interface.");
1236
1237         /* Dropping old .network file */
1238         r = link_stop_engines(link, false);
1239         if (r < 0)
1240                 return r;
1241
1242         link_drop_requests(link);
1243
1244         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1245                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1246                  * routes, and so on) foreign, and then drop unnecessary configs later by
1247                  * link_drop_foreign_config() in link_configure().
1248                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1249                  * here we need to drop the configs such as addresses, routes, and so on configured by
1250                  * the previously assigned .network file. */
1251                 link_foreignize_config(link);
1252         else {
1253                 /* Remove all managed configs. Note, foreign configs are removed in later by
1254                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1255                 r = link_drop_managed_config(link);
1256                 if (r < 0)
1257                         return r;
1258         }
1259
1260         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1261          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1262          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1263          * map here, as it depends on .network files assigned to other links. */
1264         link_free_bound_to_list(link);
1265
1266         link_free_engines(link);
1267         link->network = network_unref(link->network);
1268
1269         if (!network) {
1270                 link_set_state(link, LINK_STATE_UNMANAGED);
1271                 return 0;
1272         }
1273
1274         /* Then, apply new .network file */
1275         link->network = network_ref(network);
1276         link_update_operstate(link, true);
1277         link_dirty(link);
1278
1279         link_set_state(link, LINK_STATE_INITIALIZED);
1280         link->activated = false;
1281
1282         r = link_configure(link);
1283         if (r < 0)
1284                 return r;
1285
1286         return 1;
1287 }
1288
1289 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1290         int r;
1291
1292         assert(link);
1293
1294         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1295         if (r <= 0)
1296                 return r;
1297
1298         r = link_reconfigure_impl(link, force);
1299         if (r < 0) {
1300                 link_enter_failed(link);
1301                 return 0;
1302         }
1303
1304         return r;
1305 }
1306
1307 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1308         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1309 }
1310
1311 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1312         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1313 }
1314
1315 static int link_reconfigure_after_sleep_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1316         int r;
1317
1318         assert(link);
1319
1320         r = link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1321         if (r != 0)
1322                 return r;
1323
1324         /* r == 0 means an error occurs, the link is unmanaged, or the matching network file is unchanged. */
1325         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1326                 return 0;
1327
1328         /* re-request static configs, and restart engines. */
1329         r = link_stop_engines(link, false);
1330         if (r < 0) {
1331                 link_enter_failed(link);
1332                 return 0;
1333         }
1334
1335         r = link_acquire_dynamic_conf(link);
1336         if (r < 0) {
1337                 link_enter_failed(link);
1338                 return 0;
1339         }
1340
1341         r = link_request_static_configs(link);
1342         if (r < 0) {
1343                 link_enter_failed(link);
1344                 return 0;
1345         }
1346
1347         return 0;
1348 }
1349
1350 static int link_reconfigure_internal(Link *link, link_netlink_message_handler_t callback) {
1351         int r;
1352
1353         assert(link);
1354         assert(callback);
1355
1356         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1357          * the function from being called multiple times simultaneously, refuse to reconfigure the
1358          * interface in these cases. */
1359         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1360                 return 0; /* 0 means no-op. */
1361
1362         r = link_call_getlink(link, callback);
1363         if (r < 0)
1364                 return r;
1365
1366         return 1; /* 1 means the interface will be reconfigured. */
1367 }
1368
1369 int link_reconfigure(Link *link, bool force) {
1370         return link_reconfigure_internal(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1371 }
1372
1373 int link_reconfigure_after_sleep(Link *link) {
1374         return link_reconfigure_internal(link, link_reconfigure_after_sleep_handler);
1375 }
1376
1377 static int link_initialized_and_synced(Link *link) {
1378         int r;
1379
1380         assert(link);
1381         assert(link->manager);
1382
1383         if (link->manager->test_mode) {
1384                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1385                 link_set_state(link, LINK_STATE_UNMANAGED);
1386                 return 0;
1387         }
1388
1389         /* This may get called either from the asynchronous netlink callback,
1390          * or directly from link_check_initialized() if running in a container. */
1391         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1392                 return 0;
1393
1394         log_link_debug(link, "Link state is up-to-date");
1395         link_set_state(link, LINK_STATE_INITIALIZED);
1396
1397         r = link_new_bound_by_list(link);
1398         if (r < 0)
1399                 return r;
1400
1401         r = link_handle_bound_by_list(link);
1402         if (r < 0)
1403                 return r;
1404
1405         return link_reconfigure_impl(link, /* force = */ false);
1406 }
1407
1408 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1409         int r;
1410
1411         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1412         if (r <= 0)
1413                 return r;
1414
1415         r = link_initialized_and_synced(link);
1416         if (r < 0)
1417                 link_enter_failed(link);
1418
1419         return 0;
1420 }
1421
1422 static int link_initialized(Link *link, sd_device *device) {
1423         assert(link);
1424         assert(device);
1425
1426         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1427          * or sysattrs) may be outdated. */
1428         sd_device_ref(device);
1429         sd_device_unref(link->sd_device);
1430         link->sd_device = device;
1431
1432         /* Do not ignore unamanaged state case here. If an interface is renamed after being once
1433          * configured, and the corresponding .network file has Name= in [Match] section, then the
1434          * interface may be already in unmanaged state. See #20657. */
1435         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED))
1436                 return 0;
1437
1438         log_link_debug(link, "udev initialized link");
1439         link_set_state(link, LINK_STATE_INITIALIZED);
1440
1441         /* udev has initialized the link, but we don't know if we have yet
1442          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1443          * when it returns we know that the pending NEWLINKs have already been
1444          * processed and that we are up-to-date */
1445
1446         return link_call_getlink(link, link_initialized_handler);
1447 }
1448
1449 static int link_check_initialized(Link *link) {
1450         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1451         int r;
1452
1453         assert(link);
1454
1455         if (path_is_read_only_fs("/sys") > 0)
1456                 /* no udev */
1457                 return link_initialized_and_synced(link);
1458
1459         /* udev should be around */
1460         r = sd_device_new_from_ifindex(&device, link->ifindex);
1461         if (r < 0) {
1462                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1463                 return 0;
1464         }
1465
1466         r = sd_device_get_is_initialized(device);
1467         if (r < 0)
1468                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1469         if (r == 0) {
1470                 /* not yet ready */
1471                 log_link_debug(link, "link pending udev initialization...");
1472                 return 0;
1473         }
1474
1475         r = device_is_renaming(device);
1476         if (r < 0)
1477                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1478         if (r > 0) {
1479                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1480                 return 0;
1481         }
1482
1483         return link_initialized(link, device);
1484 }
1485
1486 int manager_udev_process_link(sd_device_monitor *monitor, sd_device *device, void *userdata) {
1487         sd_device_action_t action;
1488         Manager *m = userdata;
1489         Link *link = NULL;
1490         int r, ifindex;
1491
1492         assert(m);
1493         assert(device);
1494
1495         r = sd_device_get_action(device, &action);
1496         if (r < 0) {
1497                 log_device_debug_errno(device, r, "Failed to get udev action, ignoring device: %m");
1498                 return 0;
1499         }
1500
1501         /* Ignore the "remove" uevent — let's remove a device only if rtnetlink says so. All other uevents
1502          * are "positive" events in some form, i.e. inform us about a changed or new network interface, that
1503          * still exists — and we are interested in that. */
1504         if (action == SD_DEVICE_REMOVE)
1505                 return 0;
1506
1507         r = sd_device_get_ifindex(device, &ifindex);
1508         if (r < 0) {
1509                 log_device_debug_errno(device, r, "Ignoring udev %s event for device without ifindex or with invalid ifindex: %m",
1510                                        device_action_to_string(action));
1511                 return 0;
1512         }
1513
1514         r = device_is_renaming(device);
1515         if (r < 0) {
1516                 log_device_debug_errno(device, r, "Failed to determine the device is renamed or not, ignoring '%s' uevent: %m",
1517                                        device_action_to_string(action));
1518                 return 0;
1519         }
1520         if (r > 0) {
1521                 log_device_debug(device, "Interface is under renaming, wait for the interface to be renamed.");
1522                 return 0;
1523         }
1524
1525         r = link_get_by_index(m, ifindex, &link);
1526         if (r < 0) {
1527                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1528                 return 0;
1529         }
1530
1531         r = link_initialized(link, device);
1532         if (r < 0)
1533                 link_enter_failed(link);
1534
1535         return 0;
1536 }
1537
1538 static int link_carrier_gained(Link *link) {
1539         bool force_reconfigure;
1540         int r;
1541
1542         assert(link);
1543
1544         r = event_source_disable(link->carrier_lost_timer);
1545         if (r < 0)
1546                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1547
1548         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1549          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1550          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1551          * restarted, and the correct network information will be gained.
1552          *
1553          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1554          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1555          * already assigned to the interface (in that case, the .network file does not have the SSID=
1556          * setting in the [Match] section), and the interface is already being configured. Of course,
1557          * there may exist another .network file with higher priority and a matching SSID= setting. But
1558          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1559          *
1560          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1561          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1562         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1563         link->previous_ssid = mfree(link->previous_ssid);
1564
1565         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1566                 /* At this stage, both wlan and link information should be up-to-date. Hence,
1567                  * it is not necessary to call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or
1568                  * NL80211_CMD_GET_STATION commands, and simply call link_reconfigure_impl().
1569                  * Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1570                 r = link_reconfigure_impl(link, force_reconfigure);
1571                 if (r != 0)
1572                         return r;
1573         }
1574
1575         r = link_handle_bound_by_list(link);
1576         if (r < 0)
1577                 return r;
1578
1579         if (link->iftype == ARPHRD_CAN)
1580                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1581                 return 0;
1582
1583         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1584                 r = link_acquire_dynamic_conf(link);
1585                 if (r < 0)
1586                         return r;
1587
1588                 r = link_request_static_configs(link);
1589                 if (r < 0)
1590                         return r;
1591         }
1592
1593         return 0;
1594 }
1595
1596 static int link_carrier_lost_impl(Link *link) {
1597         int r, ret = 0;
1598
1599         assert(link);
1600
1601         link->previous_ssid = mfree(link->previous_ssid);
1602
1603         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1604                 return 0;
1605
1606         if (!link->network)
1607                 return 0;
1608
1609         r = link_stop_engines(link, false);
1610         if (r < 0)
1611                 ret = r;
1612
1613         r = link_drop_managed_config(link);
1614         if (r < 0 && ret >= 0)
1615                 ret = r;
1616
1617         return ret;
1618 }
1619
1620 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1621         Link *link = userdata;
1622         int r;
1623
1624         assert(link);
1625
1626         r = link_carrier_lost_impl(link);
1627         if (r < 0) {
1628                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1629                 link_enter_failed(link);
1630         }
1631
1632         return 0;
1633 }
1634
1635 static int link_carrier_lost(Link *link) {
1636         int r;
1637
1638         assert(link);
1639
1640         r = link_handle_bound_by_list(link);
1641         if (r < 0)
1642                 return r;
1643
1644         if (link->iftype == ARPHRD_CAN)
1645                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1646                 return 0;
1647
1648         if (!link->network)
1649                 return 0;
1650
1651         if (link->network->ignore_carrier_loss_usec == USEC_INFINITY)
1652                 return 0;
1653
1654         if (link->network->ignore_carrier_loss_usec == 0)
1655                 return link_carrier_lost_impl(link);
1656
1657         return event_reset_time_relative(link->manager->event,
1658                                          &link->carrier_lost_timer,
1659                                          clock_boottime_or_monotonic(),
1660                                          link->network->ignore_carrier_loss_usec,
1661                                          0,
1662                                          link_carrier_lost_handler,
1663                                          link,
1664                                          0,
1665                                          "link-carrier-loss",
1666                                          true);
1667 }
1668
1669 static int link_admin_state_up(Link *link) {
1670         int r;
1671
1672         assert(link);
1673
1674         /* This is called every time an interface admin state changes to up;
1675          * specifically, when IFF_UP flag changes from unset to set. */
1676
1677         if (!link->network)
1678                 return 0;
1679
1680         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1681                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1682                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1683         }
1684
1685         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1686          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1687         r = link_set_ipv6_mtu(link);
1688         if (r < 0)
1689                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1690
1691         return 0;
1692 }
1693
1694 static int link_admin_state_down(Link *link) {
1695         assert(link);
1696
1697         if (!link->network)
1698                 return 0;
1699
1700         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1701                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1702                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1703         }
1704
1705         return 0;
1706 }
1707
1708 static bool link_is_enslaved(Link *link) {
1709         if (link->flags & IFF_SLAVE)
1710                 return true;
1711
1712         if (link->master_ifindex > 0)
1713                 return true;
1714
1715         return false;
1716 }
1717
1718 static LinkAddressState address_state_from_scope(uint8_t scope) {
1719         if (scope < RT_SCOPE_SITE)
1720                 /* universally accessible addresses found */
1721                 return LINK_ADDRESS_STATE_ROUTABLE;
1722
1723         if (scope < RT_SCOPE_HOST)
1724                 /* only link or site local addresses found */
1725                 return LINK_ADDRESS_STATE_DEGRADED;
1726
1727         /* no useful addresses found */
1728         return LINK_ADDRESS_STATE_OFF;
1729 }
1730
1731 void link_update_operstate(Link *link, bool also_update_master) {
1732         LinkOperationalState operstate;
1733         LinkCarrierState carrier_state;
1734         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1735         LinkOnlineState online_state;
1736         _cleanup_strv_free_ char **p = NULL;
1737         uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1738         bool changed = false;
1739         Address *address;
1740
1741         assert(link);
1742
1743         if (link->kernel_operstate == IF_OPER_DORMANT)
1744                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1745         else if (link_has_carrier(link)) {
1746                 if (link_is_enslaved(link))
1747                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1748                 else
1749                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1750         } else if (link->flags & IFF_UP)
1751                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1752         else
1753                 carrier_state = LINK_CARRIER_STATE_OFF;
1754
1755         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1756                 Link *slave;
1757
1758                 SET_FOREACH(slave, link->slaves) {
1759                         link_update_operstate(slave, false);
1760
1761                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1762                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1763                 }
1764         }
1765
1766         SET_FOREACH(address, link->addresses) {
1767                 if (!address_is_ready(address))
1768                         continue;
1769
1770                 if (address->family == AF_INET)
1771                         ipv4_scope = MIN(ipv4_scope, address->scope);
1772
1773                 if (address->family == AF_INET6)
1774                         ipv6_scope = MIN(ipv6_scope, address->scope);
1775         }
1776
1777         ipv4_address_state = address_state_from_scope(ipv4_scope);
1778         ipv6_address_state = address_state_from_scope(ipv6_scope);
1779         address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1780
1781         /* Mapping of address and carrier state vs operational state
1782          *                                                     carrier state
1783          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1784          *                 ------------------------------------------------------------------------------
1785          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1786          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
1787          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
1788          */
1789
1790         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1791                 operstate = (LinkOperationalState) carrier_state;
1792         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1793                 operstate = LINK_OPERSTATE_ROUTABLE;
1794         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1795                 operstate = LINK_OPERSTATE_DEGRADED;
1796         else
1797                 operstate = LINK_OPERSTATE_ENSLAVED;
1798
1799         /* Only determine online state for managed links with RequiredForOnline=yes */
1800         if (!link->network || !link->network->required_for_online)
1801                 online_state = _LINK_ONLINE_STATE_INVALID;
1802         else if (operstate < link->network->required_operstate_for_online.min ||
1803                  operstate > link->network->required_operstate_for_online.max)
1804                 online_state = LINK_ONLINE_STATE_OFFLINE;
1805         else {
1806                 AddressFamily required_family = link->network->required_family_for_online;
1807                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1808                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1809
1810                 /* The operational state is within the range required for online.
1811                  * If a particular address family is also required, we might revert
1812                  * to offline in the blocks below. */
1813                 online_state = LINK_ONLINE_STATE_ONLINE;
1814
1815                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1816                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1817                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1818                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1819                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1820                 }
1821
1822                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1823                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1824                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1825                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1826                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1827                 }
1828         }
1829
1830         if (link->carrier_state != carrier_state) {
1831                 link->carrier_state = carrier_state;
1832                 changed = true;
1833                 if (strv_extend(&p, "CarrierState") < 0)
1834                         log_oom();
1835         }
1836
1837         if (link->address_state != address_state) {
1838                 link->address_state = address_state;
1839                 changed = true;
1840                 if (strv_extend(&p, "AddressState") < 0)
1841                         log_oom();
1842         }
1843
1844         if (link->ipv4_address_state != ipv4_address_state) {
1845                 link->ipv4_address_state = ipv4_address_state;
1846                 changed = true;
1847                 if (strv_extend(&p, "IPv4AddressState") < 0)
1848                         log_oom();
1849         }
1850
1851         if (link->ipv6_address_state != ipv6_address_state) {
1852                 link->ipv6_address_state = ipv6_address_state;
1853                 changed = true;
1854                 if (strv_extend(&p, "IPv6AddressState") < 0)
1855                         log_oom();
1856         }
1857
1858         if (link->operstate != operstate) {
1859                 link->operstate = operstate;
1860                 changed = true;
1861                 if (strv_extend(&p, "OperationalState") < 0)
1862                         log_oom();
1863         }
1864
1865         if (link->online_state != online_state) {
1866                 link->online_state = online_state;
1867                 changed = true;
1868                 if (strv_extend(&p, "OnlineState") < 0)
1869                         log_oom();
1870         }
1871
1872         if (p)
1873                 link_send_changed_strv(link, p);
1874         if (changed)
1875                 link_dirty(link);
1876
1877         if (also_update_master) {
1878                 Link *master;
1879
1880                 if (link_get_master(link, &master) >= 0)
1881                         link_update_operstate(master, true);
1882         }
1883 }
1884
1885 #define FLAG_STRING(string, flag, old, new)                      \
1886         (((old ^ new) & flag)                                    \
1887          ? ((old & flag) ? (" -" string) : (" +" string))        \
1888          : "")
1889
1890 static int link_update_flags(Link *link, sd_netlink_message *message) {
1891         bool link_was_admin_up, had_carrier;
1892         uint8_t operstate;
1893         unsigned flags;
1894         int r;
1895
1896         assert(link);
1897         assert(message);
1898
1899         r = sd_rtnl_message_link_get_flags(message, &flags);
1900         if (r < 0)
1901                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1902
1903         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1904         if (r == -ENODATA)
1905                 /* If we got a message without operstate, assume the state was unchanged. */
1906                 operstate = link->kernel_operstate;
1907         else if (r < 0)
1908                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1909
1910         if (link->flags == flags && link->kernel_operstate == operstate)
1911                 return 0;
1912
1913         if (link->flags != flags) {
1914                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1915
1916                 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",
1917                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1918                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1919                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1920                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
1921                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1922                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1923                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1924                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1925                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1926                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1927                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1928                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1929                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1930                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1931                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1932                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1933                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1934                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1935                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1936
1937                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1938                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1939                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1940                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1941                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1942                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1943                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1944                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1945
1946                 if (unknown_flags_added)
1947                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1948
1949                 if (unknown_flags_removed)
1950                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1951         }
1952
1953         link_was_admin_up = link->flags & IFF_UP;
1954         had_carrier = link_has_carrier(link);
1955
1956         link->flags = flags;
1957         link->kernel_operstate = operstate;
1958
1959         link_update_operstate(link, true);
1960
1961         if (!link_was_admin_up && (link->flags & IFF_UP)) {
1962                 log_link_info(link, "Link UP");
1963
1964                 r = link_admin_state_up(link);
1965                 if (r < 0)
1966                         return r;
1967         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1968                 log_link_info(link, "Link DOWN");
1969
1970                 r = link_admin_state_down(link);
1971                 if (r < 0)
1972                         return r;
1973         }
1974
1975         if (!had_carrier && link_has_carrier(link)) {
1976                 log_link_info(link, "Gained carrier");
1977
1978                 r = link_carrier_gained(link);
1979                 if (r < 0)
1980                         return r;
1981         } else if (had_carrier && !link_has_carrier(link)) {
1982                 log_link_info(link, "Lost carrier");
1983
1984                 r = link_carrier_lost(link);
1985                 if (r < 0)
1986                         return r;
1987         }
1988
1989         return 0;
1990 }
1991
1992 static int link_update_master(Link *link, sd_netlink_message *message) {
1993         int master_ifindex, r;
1994
1995         assert(link);
1996         assert(message);
1997
1998         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1999         if (r == -ENODATA)
2000                 return 0;
2001         if (r < 0)
2002                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2003
2004         if (master_ifindex == link->ifindex)
2005                 master_ifindex = 0;
2006
2007         if (master_ifindex == link->master_ifindex)
2008                 return 0;
2009
2010         if (link->master_ifindex == 0)
2011                 log_link_debug(link, "Joined to master interface: %i", master_ifindex);
2012         else if (master_ifindex == 0)
2013                 log_link_debug(link, "Leaved from master interface: %i", link->master_ifindex);
2014         else
2015                 log_link_debug(link, "Master interface is changed: %i → %i", link->master_ifindex, master_ifindex);
2016
2017         link_drop_from_master(link);
2018
2019         link->master_ifindex = master_ifindex;
2020
2021         r = link_append_to_master(link);
2022         if (r < 0)
2023                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2024
2025         return 0;
2026 }
2027
2028 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2029         struct hw_addr_data addr;
2030         int r;
2031
2032         assert(link);
2033         assert(message);
2034
2035         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2036         if (r < 0 && r != -ENODATA)
2037                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2038
2039         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2040         if (r == -ENODATA)
2041                 return 0;
2042         if (r < 0)
2043                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2044
2045         if (hw_addr_equal(&link->hw_addr, &addr))
2046                 return 0;
2047
2048         if (link->hw_addr.length == 0)
2049                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2050         else {
2051                 log_link_debug(link, "Hardware address is changed: %s → %s",
2052                                HW_ADDR_TO_STR(&link->hw_addr), HW_ADDR_TO_STR(&addr));
2053
2054                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2055         }
2056
2057         link->hw_addr = addr;
2058
2059         if (!hw_addr_is_null(&link->hw_addr)) {
2060                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2061                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2062                         /* bonding master and its slaves have the same hardware address. */
2063                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2064                 if (r < 0)
2065                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2066         }
2067
2068         r = ipv4ll_update_mac(link);
2069         if (r < 0)
2070                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2071
2072         r = ipv4ll_update_mac(link);
2073         if (r < 0)
2074                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2075
2076         r = dhcp4_update_mac(link);
2077         if (r < 0)
2078                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2079
2080         r = dhcp6_update_mac(link);
2081         if (r < 0)
2082                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2083
2084         r = radv_update_mac(link);
2085         if (r < 0)
2086                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2087
2088         if (link->ndisc) {
2089                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2090                 if (r < 0)
2091                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2092         }
2093
2094         if (link->lldp_rx) {
2095                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2096                 if (r < 0)
2097                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2098         }
2099
2100         if (link->lldp_tx) {
2101                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2102                 if (r < 0)
2103                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2104         }
2105
2106         return 0;
2107 }
2108
2109 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2110         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2111         int r;
2112
2113         assert(link);
2114         assert(message);
2115
2116         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2117         if (r == -ENODATA)
2118                 return 0;
2119         if (r < 0)
2120                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2121         if (mtu == 0)
2122                 return 0;
2123
2124         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2125         if (r < 0 && r != -ENODATA)
2126                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2127
2128         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2129         if (r < 0 && r != -ENODATA)
2130                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2131
2132         if (max_mtu == 0)
2133                 max_mtu = UINT32_MAX;
2134
2135         link->min_mtu = min_mtu;
2136         link->max_mtu = max_mtu;
2137
2138         if (link->original_mtu == 0) {
2139                 link->original_mtu = mtu;
2140                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2141                                link->original_mtu, link->min_mtu, link->max_mtu);
2142         }
2143
2144         if (link->mtu == mtu)
2145                 return 0;
2146
2147         if (link->mtu != 0)
2148                 log_link_debug(link, "MTU is changed: %"PRIu32" → %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2149                                link->mtu, mtu, link->min_mtu, link->max_mtu);
2150
2151         link->mtu = mtu;
2152
2153         if (link->dhcp_client) {
2154                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2155                 if (r < 0)
2156                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2157         }
2158
2159         if (link->radv) {
2160                 r = sd_radv_set_mtu(link->radv, link->mtu);
2161                 if (r < 0)
2162                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2163         }
2164
2165         return 0;
2166 }
2167
2168 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2169         _cleanup_strv_free_ char **altnames = NULL;
2170         char **n;
2171         int r;
2172
2173         assert(link);
2174         assert(message);
2175
2176         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2177         if (r == -ENODATA)
2178                 /* The message does not have IFLA_PROP_LIST container attribute. It does not means the
2179                  * interface has no alternative name. */
2180                 return 0;
2181         if (r < 0)
2182                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2183
2184         if (strv_equal(altnames, link->alternative_names))
2185                 return 0;
2186
2187         STRV_FOREACH(n, link->alternative_names)
2188                 hashmap_remove(link->manager->links_by_name, *n);
2189
2190         strv_free_and_replace(link->alternative_names, altnames);
2191
2192         STRV_FOREACH(n, link->alternative_names) {
2193                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2194                 if (r < 0)
2195                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2196         }
2197
2198         return 0;
2199 }
2200
2201 static int link_update_name(Link *link, sd_netlink_message *message) {
2202         char ifname_from_index[IF_NAMESIZE];
2203         const char *ifname;
2204         int r;
2205
2206         assert(link);
2207         assert(message);
2208
2209         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2210         if (r == -ENODATA)
2211                 /* Hmm?? But ok. */
2212                 return 0;
2213         if (r < 0)
2214                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2215
2216         if (streq(ifname, link->ifname))
2217                 return 0;
2218
2219         r = format_ifname(link->ifindex, ifname_from_index);
2220         if (r < 0)
2221                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2222
2223         if (!streq(ifname, ifname_from_index)) {
2224                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2225                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2226                                ifname, ifname_from_index);
2227                 return 0;
2228         }
2229
2230         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2231
2232         hashmap_remove(link->manager->links_by_name, link->ifname);
2233
2234         r = free_and_strdup(&link->ifname, ifname);
2235         if (r < 0)
2236                 return log_oom_debug();
2237
2238         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2239         if (r < 0)
2240                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2241
2242         if (link->dhcp_client) {
2243                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2244                 if (r < 0)
2245                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2246         }
2247
2248         if (link->dhcp6_client) {
2249                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2250                 if (r < 0)
2251                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2252         }
2253
2254         if (link->ndisc) {
2255                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2256                 if (r < 0)
2257                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2258         }
2259
2260         if (link->dhcp_server) {
2261                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2262                 if (r < 0)
2263                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2264         }
2265
2266         if (link->radv) {
2267                 r = sd_radv_set_ifname(link->radv, link->ifname);
2268                 if (r < 0)
2269                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2270         }
2271
2272         if (link->lldp_rx) {
2273                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2274                 if (r < 0)
2275                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2276         }
2277
2278         if (link->lldp_tx) {
2279                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2280                 if (r < 0)
2281                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2282         }
2283
2284         if (link->ipv4ll) {
2285                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2286                 if (r < 0)
2287                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2288         }
2289
2290         r = ipv4acd_set_ifname(link);
2291         if (r < 0)
2292                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2293
2294         return 0;
2295 }
2296
2297 static int link_update(Link *link, sd_netlink_message *message) {
2298         int r;
2299
2300         assert(link);
2301         assert(message);
2302
2303         r = link_update_name(link, message);
2304         if (r < 0)
2305                 return r;
2306
2307         r = link_update_alternative_names(link, message);
2308         if (r < 0)
2309                 return r;
2310
2311         r = link_update_mtu(link, message);
2312         if (r < 0)
2313                 return r;
2314
2315         r = link_update_hardware_address(link, message);
2316         if (r < 0)
2317                 return r;
2318
2319         r = link_update_master(link, message);
2320         if (r < 0)
2321                 return r;
2322
2323         r = link_update_ipv6ll_addrgen_mode(link, message);
2324         if (r < 0)
2325                 return r;
2326
2327         return link_update_flags(link, message);
2328 }
2329
2330 static Link *link_drop_or_unref(Link *link) {
2331         if (!link)
2332                 return NULL;
2333         if (!link->manager)
2334                 return link_unref(link);
2335         return link_drop(link);
2336 }
2337
2338 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2339
2340 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2341         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2342         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2343         unsigned short iftype;
2344         int r, ifindex;
2345
2346         assert(manager);
2347         assert(message);
2348         assert(ret);
2349
2350         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2351         if (r < 0)
2352                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2353         else if (ifindex <= 0)
2354                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2355
2356         r = sd_rtnl_message_link_get_type(message, &iftype);
2357         if (r < 0)
2358                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2359
2360         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2361         if (r < 0)
2362                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2363
2364         /* check for link kind */
2365         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2366         if (r >= 0) {
2367                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2368                 if (r < 0 && r != -ENODATA)
2369                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2370                 r = sd_netlink_message_exit_container(message);
2371                 if (r < 0)
2372                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2373         }
2374
2375         if (!manager->test_mode) {
2376                 /* Do not update state files when running in test mode. */
2377                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2378                         return log_oom_debug();
2379
2380                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2381                         return log_oom_debug();
2382
2383                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2384                         return log_oom_debug();
2385         }
2386
2387         link = new(Link, 1);
2388         if (!link)
2389                 return -ENOMEM;
2390
2391         *link = (Link) {
2392                 .n_ref = 1,
2393                 .state = LINK_STATE_PENDING,
2394                 .online_state = _LINK_ONLINE_STATE_INVALID,
2395                 .ifindex = ifindex,
2396                 .iftype = iftype,
2397                 .ifname = TAKE_PTR(ifname),
2398                 .kind = TAKE_PTR(kind),
2399
2400                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2401
2402                 .state_file = TAKE_PTR(state_file),
2403                 .lease_file = TAKE_PTR(lease_file),
2404                 .lldp_file = TAKE_PTR(lldp_file),
2405
2406                 .n_dns = UINT_MAX,
2407                 .dns_default_route = -1,
2408                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2409                 .mdns = _RESOLVE_SUPPORT_INVALID,
2410                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2411                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2412         };
2413
2414         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2415         if (r < 0)
2416                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2417
2418         link->manager = manager;
2419
2420         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2421         if (r < 0)
2422                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2423
2424         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2425                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2426
2427         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2428         if (r < 0) {
2429                 if (r != -ENODATA)
2430                         log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute, ignoring: %m");
2431
2432                 if (netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL) >= 0) {
2433                         /* Fallback to ethtool, if the link has a hardware address. */
2434                         r = ethtool_get_permanent_hw_addr(&manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2435                         if (r < 0)
2436                                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2437                 }
2438         }
2439         if (link->permanent_hw_addr.length > 0)
2440                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2441
2442         r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
2443         if (r < 0)
2444                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2445         else
2446                 log_link_debug(link, "Found driver: %s", strna(link->driver));
2447
2448         if (streq_ptr(link->driver, "dsa")) {
2449                 uint32_t dsa_master_ifindex;
2450
2451                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2452                 if (r < 0) {
2453                         dsa_master_ifindex = 0;
2454                         if (r != -ENODATA)
2455                                 log_link_warning_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface, ignoring: %m");
2456                 } else if (dsa_master_ifindex > INT_MAX) {
2457                         dsa_master_ifindex = 0;
2458                         log_link_warning(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2459                                          dsa_master_ifindex);
2460                 }
2461
2462                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2463         }
2464
2465         *ret = TAKE_PTR(link);
2466         return 0;
2467 }
2468
2469 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2470         Link *link = NULL;
2471         NetDev *netdev = NULL;
2472         uint16_t type;
2473         const char *name;
2474         int r, ifindex;
2475
2476         assert(rtnl);
2477         assert(message);
2478         assert(manager);
2479
2480         if (sd_netlink_message_is_error(message)) {
2481                 r = sd_netlink_message_get_errno(message);
2482                 if (r < 0)
2483                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2484
2485                 return 0;
2486         }
2487
2488         r = sd_netlink_message_get_type(message, &type);
2489         if (r < 0) {
2490                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2491                 return 0;
2492         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2493                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2494                 return 0;
2495         }
2496
2497         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2498         if (r < 0) {
2499                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2500                 return 0;
2501         } else if (ifindex <= 0) {
2502                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2503                 return 0;
2504         }
2505
2506         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2507         if (r < 0) {
2508                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2509                 return 0;
2510         }
2511
2512         (void) link_get_by_index(manager, ifindex, &link);
2513         (void) netdev_get(manager, name, &netdev);
2514
2515         switch (type) {
2516         case RTM_NEWLINK:
2517                 if (netdev) {
2518                         /* netdev exists, so make sure the ifindex matches */
2519                         r = netdev_set_ifindex(netdev, message);
2520                         if (r < 0) {
2521                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2522                                 return 0;
2523                         }
2524                 }
2525
2526                 if (!link) {
2527                         /* link is new, so add it */
2528                         r = link_new(manager, message, &link);
2529                         if (r < 0) {
2530                                 log_warning_errno(r, "Could not process new link message: %m");
2531                                 return 0;
2532                         }
2533
2534                         r = link_update(link, message);
2535                         if (r < 0) {
2536                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2537                                 link_enter_failed(link);
2538                                 return 0;
2539                         }
2540
2541                         r = link_check_initialized(link);
2542                         if (r < 0) {
2543                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2544                                 link_enter_failed(link);
2545                                 return 0;
2546                         }
2547                 } else {
2548                         r = link_update(link, message);
2549                         if (r < 0) {
2550                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2551                                 link_enter_failed(link);
2552                                 return 0;
2553                         }
2554                 }
2555                 break;
2556
2557         case RTM_DELLINK:
2558                 link_drop(link);
2559                 netdev_drop(netdev);
2560                 break;
2561
2562         default:
2563                 assert_not_reached();
2564         }
2565
2566         return 1;
2567 }
2568
2569 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2570         uint16_t message_type;
2571         int r;
2572
2573         assert(m);
2574         assert(link);
2575         assert(error_msg);
2576
2577         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2578                 return 0;
2579
2580         r = sd_netlink_message_get_errno(m);
2581         if (r < 0) {
2582                 log_link_message_warning_errno(link, m, r, error_msg);
2583                 link_enter_failed(link);
2584                 return 0;
2585         }
2586
2587         r = sd_netlink_message_get_type(m, &message_type);
2588         if (r < 0) {
2589                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2590                 return 0;
2591         }
2592         if (message_type != RTM_NEWLINK) {
2593                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2594                 return 0;
2595         }
2596
2597         r = link_update(link, m);
2598         if (r < 0) {
2599                 link_enter_failed(link);
2600                 return 0;
2601         }
2602
2603         return 1;
2604 }
2605
2606 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2607         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2608         int r;
2609
2610         assert(link);
2611         assert(link->manager);
2612         assert(link->manager->rtnl);
2613         assert(callback);
2614
2615         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2616         if (r < 0)
2617                 return r;
2618
2619         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2620                                link_netlink_destroy_callback, link);
2621         if (r < 0)
2622                 return r;
2623
2624         link_ref(link);
2625         return 0;
2626 }
2627
2628 static const char* const link_state_table[_LINK_STATE_MAX] = {
2629         [LINK_STATE_PENDING]     = "pending",
2630         [LINK_STATE_INITIALIZED] = "initialized",
2631         [LINK_STATE_CONFIGURING] = "configuring",
2632         [LINK_STATE_CONFIGURED]  = "configured",
2633         [LINK_STATE_UNMANAGED]   = "unmanaged",
2634         [LINK_STATE_FAILED]      = "failed",
2635         [LINK_STATE_LINGER]      = "linger",
2636 };
2637
2638 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2639
2640 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2641         _cleanup_free_ char *str = NULL;
2642         static const char* map[] = {
2643                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2644                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid.*/
2645                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2646                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2647                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2648                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2649                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2650                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2651                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2652                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2653                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2654                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2655                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast.*/
2656                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2657                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2658                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2659                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2660                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2661                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2662         };
2663
2664         assert(ret);
2665
2666         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2667                 if (FLAGS_SET(flags, 1 << i) && map[i])
2668                         if (!strextend_with_separator(&str, ",", map[i]))
2669                                 return -ENOMEM;
2670
2671         *ret = TAKE_PTR(str);
2672         return 0;
2673 }
2674
2675 static const char * const kernel_operstate_table[] = {
2676         [IF_OPER_UNKNOWN]        = "unknown",
2677         [IF_OPER_NOTPRESENT]     = "not-present",
2678         [IF_OPER_DOWN]           = "down",
2679         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2680         [IF_OPER_TESTING]        = "testing",
2681         [IF_OPER_DORMANT]        = "dormant",
2682         [IF_OPER_UP]             = "up",
2683 };
2684
2685 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);