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 "glyph-util.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 "stdio-util.h"
  63 #include "string-table.h"
  64 #include "strv.h"
  65 #include "tc.h"
  66 #include "tmpfile-util.h"
  67 #include "udev-util.h"
  68 #include "util.h"
  69 #include "vrf.h"
  70
  71 bool link_ipv6_enabled(Link *link) {
  72         assert(link);
  73
  74         if (!socket_ipv6_is_supported())
  75                 return false;
  76
  77         if (link->iftype == ARPHRD_CAN)
  78                 return false;
  79
  80         if (!link->network)
  81                 return false;
  82
  83         if (link->network->bond)
  84                 return false;
  85
  86         if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
  87                 return true;
  88
  89         if (network_has_static_ipv6_configurations(link->network))
  90                 return true;
  91
  92         return false;
  93 }
  94
  95 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
  96         assert(link);
  97
  98         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
  99                 return false;
 100
 101         if (!link->network)
 102                 return allow_unmanaged;
 103
 104         if (!link->network->configure_without_carrier) {
 105                 if (link->set_flags_messages > 0)
 106                         return false;
 107
 108                 if (!link_has_carrier(link))
 109                         return false;
 110         }
 111
 112         if (link->set_link_messages > 0)
 113                 return false;
 114
 115         if (!link->activated)
 116                 return false;
 117
 118         return true;
 119 }
 120
 121 void link_ntp_settings_clear(Link *link) {
 122         link->ntp = strv_free(link->ntp);
 123 }
 124
 125 void link_dns_settings_clear(Link *link) {
 126         if (link->n_dns != UINT_MAX)
 127                 for (unsigned i = 0; i < link->n_dns; i++)
 128                         in_addr_full_free(link->dns[i]);
 129         link->dns = mfree(link->dns);
 130         link->n_dns = UINT_MAX;
 131
 132         link->search_domains = ordered_set_free(link->search_domains);
 133         link->route_domains = ordered_set_free(link->route_domains);
 134
 135         link->dns_default_route = -1;
 136         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 137         link->mdns = _RESOLVE_SUPPORT_INVALID;
 138         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 139         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 140
 141         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 142 }
 143
 144 static void link_free_engines(Link *link) {
 145         if (!link)
 146                 return;
 147
 148         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 149         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 150         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 151         link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
 152
 153         link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
 154         link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
 155
 156         ndisc_flush(link);
 157
 158         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 159         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 160         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 161         link->ndisc = sd_ndisc_unref(link->ndisc);
 162         link->radv = sd_radv_unref(link->radv);
 163 }
 164
 165 static Link *link_free(Link *link) {
 166         assert(link);
 167
 168         link_ntp_settings_clear(link);
 169         link_dns_settings_clear(link);
 170
 171         link->routes = set_free(link->routes);
 172         link->nexthops = set_free(link->nexthops);
 173         link->neighbors = set_free(link->neighbors);
 174         link->addresses = set_free(link->addresses);
 175         link->qdiscs = set_free(link->qdiscs);
 176         link->tclasses = set_free(link->tclasses);
 177
 178         link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
 179
 180         link_free_engines(link);
 181
 182         set_free(link->sr_iov_virt_port_ifindices);
 183         free(link->ifname);
 184         strv_free(link->alternative_names);
 185         free(link->kind);
 186         free(link->ssid);
 187         free(link->previous_ssid);
 188         free(link->driver);
 189
 190         unlink_and_free(link->lease_file);
 191         unlink_and_free(link->lldp_file);
 192         unlink_and_free(link->state_file);
 193
 194         sd_device_unref(link->dev);
 195         netdev_unref(link->netdev);
 196
 197         hashmap_free(link->bound_to_links);
 198         hashmap_free(link->bound_by_links);
 199
 200         set_free_with_destructor(link->slaves, link_unref);
 201
 202         network_unref(link->network);
 203
 204         sd_event_source_disable_unref(link->carrier_lost_timer);
 205
 206         return mfree(link);
 207 }
 208
 209 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 210
 211 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
 212         Link *link;
 213
 214         assert(m);
 215         assert(ifindex > 0);
 216
 217         link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
 218         if (!link)
 219                 return -ENODEV;
 220
 221         if (ret)
 222                 *ret = link;
 223         return 0;
 224 }
 225
 226 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
 227         Link *link;
 228
 229         assert(m);
 230         assert(ifname);
 231
 232         link = hashmap_get(m->links_by_name, ifname);
 233         if (!link)
 234                 return -ENODEV;
 235
 236         if (ret)
 237                 *ret = link;
 238         return 0;
 239 }
 240
 241 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
 242         Link *link;
 243
 244         assert(m);
 245         assert(hw_addr);
 246
 247         link = hashmap_get(m->links_by_hw_addr, hw_addr);
 248         if (!link)
 249                 return -ENODEV;
 250
 251         if (ret)
 252                 *ret = link;
 253         return 0;
 254 }
 255
 256 int link_get_master(Link *link, Link **ret) {
 257         assert(link);
 258         assert(link->manager);
 259         assert(ret);
 260
 261         if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
 262                 return -ENODEV;
 263
 264         return link_get_by_index(link->manager, link->master_ifindex, ret);
 265 }
 266
 267 void link_set_state(Link *link, LinkState state) {
 268         assert(link);
 269
 270         if (link->state == state)
 271                 return;
 272
 273         log_link_debug(link, "State changed: %s -> %s",
 274                        link_state_to_string(link->state),
 275                        link_state_to_string(state));
 276
 277         link->state = state;
 278
 279         link_send_changed(link, "AdministrativeState", NULL);
 280         link_dirty(link);
 281 }
 282
 283 int link_stop_engines(Link *link, bool may_keep_dhcp) {
 284         int r = 0, k;
 285
 286         assert(link);
 287         assert(link->manager);
 288         assert(link->manager->event);
 289
 290         bool keep_dhcp = may_keep_dhcp &&
 291                          link->network &&
 292                          !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
 293                          (link->manager->restarting ||
 294                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 295
 296         if (!keep_dhcp) {
 297                 k = sd_dhcp_client_stop(link->dhcp_client);
 298                 if (k < 0)
 299                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 300         }
 301
 302         k = sd_dhcp_server_stop(link->dhcp_server);
 303         if (k < 0)
 304                 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
 305
 306         k = sd_lldp_rx_stop(link->lldp_rx);
 307         if (k < 0)
 308                 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
 309
 310         k = sd_lldp_tx_stop(link->lldp_tx);
 311         if (k < 0)
 312                 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
 313
 314         k = sd_ipv4ll_stop(link->ipv4ll);
 315         if (k < 0)
 316                 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 317
 318         k = ipv4acd_stop(link);
 319         if (k < 0)
 320                 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 321
 322         k = sd_dhcp6_client_stop(link->dhcp6_client);
 323         if (k < 0)
 324                 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 325
 326         k = dhcp_pd_remove(link, /* only_marked = */ false);
 327         if (k < 0)
 328                 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 329
 330         k = sd_ndisc_stop(link->ndisc);
 331         if (k < 0)
 332                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 333
 334         ndisc_flush(link);
 335
 336         k = sd_radv_stop(link->radv);
 337         if (k < 0)
 338                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 339
 340         return r;
 341 }
 342
 343 void link_enter_failed(Link *link) {
 344         assert(link);
 345
 346         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 347                 return;
 348
 349         log_link_warning(link, "Failed");
 350
 351         link_set_state(link, LINK_STATE_FAILED);
 352
 353         (void) link_stop_engines(link, false);
 354 }
 355
 356 void link_check_ready(Link *link) {
 357         Address *a;
 358
 359         assert(link);
 360
 361         if (link->state == LINK_STATE_CONFIGURED)
 362                 return;
 363
 364         if (link->state != LINK_STATE_CONFIGURING)
 365                 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
 366
 367         if (!link->network)
 368                 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
 369
 370         if (!link->tc_configured)
 371                 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
 372
 373         if (link->set_link_messages > 0)
 374                 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
 375
 376         if (!link->activated)
 377                 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
 378
 379         if (link->iftype == ARPHRD_CAN) {
 380                 /* let's shortcut things for CAN which doesn't need most of checks below. */
 381                 link_set_state(link, LINK_STATE_CONFIGURED);
 382                 return;
 383         }
 384
 385         if (!link->stacked_netdevs_created)
 386                 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
 387
 388         if (!link->static_addresses_configured)
 389                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 390
 391         SET_FOREACH(a, link->addresses)
 392                 if (!address_is_ready(a))
 393                         return (void) log_link_debug(link, "%s(): address %s is not ready.", __func__,
 394                                                      IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
 395
 396         if (!link->static_address_labels_configured)
 397                 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
 398
 399         if (!link->static_bridge_fdb_configured)
 400                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 401
 402         if (!link->static_bridge_mdb_configured)
 403                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 404
 405         if (!link->static_ipv6_proxy_ndp_configured)
 406                 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
 407
 408         if (!link->static_neighbors_configured)
 409                 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
 410
 411         if (!link->static_nexthops_configured)
 412                 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
 413
 414         if (!link->static_routes_configured)
 415                 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
 416
 417         if (!link->static_routing_policy_rules_configured)
 418                 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
 419
 420         if (!link->sr_iov_configured)
 421                 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
 422
 423         /* IPv6LL is assigned after the link gains its carrier. */
 424         if (!link->network->configure_without_carrier &&
 425             link_ipv6ll_enabled(link) &&
 426             !in6_addr_is_set(&link->ipv6ll_address))
 427                 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
 428
 429         bool has_dynamic_address = false;
 430         SET_FOREACH(a, link->addresses) {
 431                 if (address_is_marked(a))
 432                         continue;
 433                 if (!address_exists(a))
 434                         continue;
 435                 if (IN_SET(a->source,
 436                            NETWORK_CONFIG_SOURCE_IPV4LL,
 437                            NETWORK_CONFIG_SOURCE_DHCP4,
 438                            NETWORK_CONFIG_SOURCE_DHCP6,
 439                            NETWORK_CONFIG_SOURCE_DHCP_PD,
 440                            NETWORK_CONFIG_SOURCE_NDISC)) {
 441                         has_dynamic_address = true;
 442                         break;
 443                 }
 444         }
 445
 446         if ((link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) ||
 447              (link_dhcp_pd_is_enabled(link) && link->network->dhcp_pd_assign)) && !has_dynamic_address)
 448                 /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
 449                 return (void) log_link_debug(link, "%s(): DHCPv4, DHCPv6, DHCP-PD or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
 450
 451         /* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
 452         if (link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) ||
 453             link_dhcp6_enabled(link) || link_dhcp_pd_is_enabled(link) ||
 454             (!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link))) {
 455
 456                 if (!link->ipv4ll_address_configured && !link->dhcp4_configured &&
 457                     !link->dhcp6_configured && !link->dhcp_pd_configured && !link->ndisc_configured)
 458                         /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
 459                         return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
 460
 461                 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
 462                                __func__,
 463                                yes_no(link->ipv4ll_address_configured),
 464                                yes_no(link->dhcp4_configured),
 465                                yes_no(link->dhcp6_configured),
 466                                yes_no(link->dhcp_pd_configured),
 467                                yes_no(link->ndisc_configured));
 468         }
 469
 470         link_set_state(link, LINK_STATE_CONFIGURED);
 471 }
 472
 473 static int link_request_static_configs(Link *link) {
 474         int r;
 475
 476         assert(link);
 477         assert(link->network);
 478         assert(link->state != _LINK_STATE_INVALID);
 479
 480         r = link_request_static_addresses(link);
 481         if (r < 0)
 482                 return r;
 483
 484         r = link_request_static_address_labels(link);
 485         if (r < 0)
 486                 return r;
 487
 488         r = link_request_static_bridge_fdb(link);
 489         if (r < 0)
 490                 return r;
 491
 492         r = link_request_static_bridge_mdb(link);
 493         if (r < 0)
 494                 return r;
 495
 496         r = link_request_static_ipv6_proxy_ndp_addresses(link);
 497         if (r < 0)
 498                 return r;
 499
 500         r = link_request_static_neighbors(link);
 501         if (r < 0)
 502                 return r;
 503
 504         r = link_request_static_nexthops(link, false);
 505         if (r < 0)
 506                 return r;
 507
 508         r = link_request_static_routes(link, false);
 509         if (r < 0)
 510                 return r;
 511
 512         r = link_request_static_routing_policy_rules(link);
 513         if (r < 0)
 514                 return r;
 515
 516         return 0;
 517 }
 518
 519 static int link_request_stacked_netdevs(Link *link) {
 520         NetDev *netdev;
 521         int r;
 522
 523         assert(link);
 524
 525         link->stacked_netdevs_created = false;
 526
 527         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 528                 r = link_request_stacked_netdev(link, netdev);
 529                 if (r < 0)
 530                         return r;
 531         }
 532
 533         if (link->create_stacked_netdev_messages == 0) {
 534                 link->stacked_netdevs_created = true;
 535                 link_check_ready(link);
 536         }
 537
 538         return 0;
 539 }
 540
 541 static int link_acquire_dynamic_ipv6_conf(Link *link) {
 542         int r;
 543
 544         assert(link);
 545
 546         r = radv_start(link);
 547         if (r < 0)
 548                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 549
 550         r = ndisc_start(link);
 551         if (r < 0)
 552                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 553
 554         r = dhcp6_start(link);
 555         if (r < 0)
 556                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 557
 558         return 0;
 559 }
 560
 561 static int link_acquire_dynamic_ipv4_conf(Link *link) {
 562         int r;
 563
 564         assert(link);
 565         assert(link->manager);
 566         assert(link->manager->event);
 567
 568         if (link->dhcp_client) {
 569                 r = dhcp4_start(link);
 570                 if (r < 0)
 571                         return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
 572
 573                 log_link_debug(link, "Acquiring DHCPv4 lease.");
 574
 575         } else if (link->ipv4ll) {
 576                 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
 577                         r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
 578                         if (r < 0)
 579                                 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
 580                 }
 581
 582                 r = sd_ipv4ll_start(link->ipv4ll);
 583                 if (r < 0)
 584                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
 585
 586                 log_link_debug(link, "Acquiring IPv4 link-local address.");
 587         }
 588
 589         if (link->dhcp_server) {
 590                 r = sd_dhcp_server_start(link->dhcp_server);
 591                 if (r < 0)
 592                         return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
 593         }
 594
 595         r = ipv4acd_start(link);
 596         if (r < 0)
 597                 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
 598
 599         return 0;
 600 }
 601
 602 static int link_acquire_dynamic_conf(Link *link) {
 603         int r;
 604
 605         assert(link);
 606         assert(link->network);
 607
 608         r = link_acquire_dynamic_ipv4_conf(link);
 609         if (r < 0)
 610                 return r;
 611
 612         if (in6_addr_is_set(&link->ipv6ll_address)) {
 613                 r = link_acquire_dynamic_ipv6_conf(link);
 614                 if (r < 0)
 615                         return r;
 616         }
 617
 618         if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
 619                 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
 620                  * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
 621                  * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
 622                  * below will be called in radv_start(). */
 623                 r = dhcp_request_prefix_delegation(link);
 624                 if (r < 0)
 625                         return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 626         }
 627
 628         if (link->lldp_tx) {
 629                 r = sd_lldp_tx_start(link->lldp_tx);
 630                 if (r < 0)
 631                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
 632         }
 633
 634         if (link->lldp_rx) {
 635                 r = sd_lldp_rx_start(link->lldp_rx);
 636                 if (r < 0)
 637                         return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
 638         }
 639
 640         return 0;
 641 }
 642
 643 int link_ipv6ll_gained(Link *link) {
 644         int r;
 645
 646         assert(link);
 647
 648         log_link_info(link, "Gained IPv6LL");
 649
 650         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 651                 return 0;
 652
 653         r = link_acquire_dynamic_ipv6_conf(link);
 654         if (r < 0)
 655                 return r;
 656
 657         link_check_ready(link);
 658         return 0;
 659 }
 660
 661 int link_handle_bound_to_list(Link *link) {
 662         bool required_up = false;
 663         bool link_is_up = false;
 664         Link *l;
 665
 666         assert(link);
 667
 668         /* If at least one interface in bound_to_links has carrier, then make this interface up.
 669          * If all interfaces in bound_to_links do not, then make this interface down. */
 670
 671         if (hashmap_isempty(link->bound_to_links))
 672                 return 0;
 673
 674         if (link->flags & IFF_UP)
 675                 link_is_up = true;
 676
 677         HASHMAP_FOREACH(l, link->bound_to_links)
 678                 if (link_has_carrier(l)) {
 679                         required_up = true;
 680                         break;
 681                 }
 682
 683         if (!required_up && link_is_up)
 684                 return link_request_to_bring_up_or_down(link, /* up = */ false);
 685         if (required_up && !link_is_up)
 686                 return link_request_to_bring_up_or_down(link, /* up = */ true);
 687
 688         return 0;
 689 }
 690
 691 static int link_handle_bound_by_list(Link *link) {
 692         Link *l;
 693         int r;
 694
 695         assert(link);
 696
 697         /* Update up or down state of interfaces which depend on this interface's carrier state. */
 698
 699         if (hashmap_isempty(link->bound_by_links))
 700                 return 0;
 701
 702         HASHMAP_FOREACH(l, link->bound_by_links) {
 703                 r = link_handle_bound_to_list(l);
 704                 if (r < 0)
 705                         return r;
 706         }
 707
 708         return 0;
 709 }
 710
 711 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
 712         int r;
 713
 714         assert(link);
 715         assert(carrier);
 716
 717         if (link == carrier)
 718                 return 0;
 719
 720         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
 721                 return 0;
 722
 723         r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
 724         if (r < 0)
 725                 return r;
 726
 727         link_dirty(link);
 728
 729         return 0;
 730 }
 731
 732 static int link_new_bound_by_list(Link *link) {
 733         Manager *m;
 734         Link *carrier;
 735         int r;
 736
 737         assert(link);
 738         assert(link->manager);
 739
 740         m = link->manager;
 741
 742         HASHMAP_FOREACH(carrier, m->links_by_index) {
 743                 if (!carrier->network)
 744                         continue;
 745
 746                 if (strv_isempty(carrier->network->bind_carrier))
 747                         continue;
 748
 749                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
 750                         r = link_put_carrier(link, carrier, &link->bound_by_links);
 751                         if (r < 0)
 752                                 return r;
 753                 }
 754         }
 755
 756         HASHMAP_FOREACH(carrier, link->bound_by_links) {
 757                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
 758                 if (r < 0)
 759                         return r;
 760         }
 761
 762         return 0;
 763 }
 764
 765 static int link_new_bound_to_list(Link *link) {
 766         Manager *m;
 767         Link *carrier;
 768         int r;
 769
 770         assert(link);
 771         assert(link->manager);
 772
 773         if (!link->network)
 774                 return 0;
 775
 776         if (strv_isempty(link->network->bind_carrier))
 777                 return 0;
 778
 779         m = link->manager;
 780
 781         HASHMAP_FOREACH(carrier, m->links_by_index) {
 782                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
 783                         r = link_put_carrier(link, carrier, &link->bound_to_links);
 784                         if (r < 0)
 785                                 return r;
 786                 }
 787         }
 788
 789         HASHMAP_FOREACH(carrier, link->bound_to_links) {
 790                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
 791                 if (r < 0)
 792                         return r;
 793         }
 794
 795         return 0;
 796 }
 797
 798 static void link_free_bound_to_list(Link *link) {
 799         bool updated = false;
 800         Link *bound_to;
 801
 802         assert(link);
 803
 804         while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
 805                 updated = true;
 806
 807                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
 808                         link_dirty(bound_to);
 809         }
 810
 811         if (updated)
 812                 link_dirty(link);
 813 }
 814
 815 static void link_free_bound_by_list(Link *link) {
 816         bool updated = false;
 817         Link *bound_by;
 818
 819         assert(link);
 820
 821         while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
 822                 updated = true;
 823
 824                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
 825                         link_dirty(bound_by);
 826                         link_handle_bound_to_list(bound_by);
 827                 }
 828         }
 829
 830         if (updated)
 831                 link_dirty(link);
 832 }
 833
 834 static int link_append_to_master(Link *link) {
 835         Link *master;
 836         int r;
 837
 838         assert(link);
 839
 840         /* - The link may have no master.
 841          * - RTM_NEWLINK message about master interface may not be received yet. */
 842         if (link_get_master(link, &master) < 0)
 843                 return 0;
 844
 845         r = set_ensure_put(&master->slaves, NULL, link);
 846         if (r <= 0)
 847                 return r;
 848
 849         link_ref(link);
 850         return 0;
 851 }
 852
 853 static void link_drop_from_master(Link *link) {
 854         Link *master;
 855
 856         assert(link);
 857
 858         if (!link->manager)
 859                 return;
 860
 861         if (link_get_master(link, &master) < 0)
 862                 return;
 863
 864         link_unref(set_remove(master->slaves, link));
 865 }
 866
 867 static void link_drop_requests(Link *link) {
 868         Request *req;
 869
 870         assert(link);
 871         assert(link->manager);
 872
 873         ORDERED_SET_FOREACH(req, link->manager->request_queue)
 874                 if (req->link == link)
 875                         request_detach(link->manager, req);
 876 }
 877
 878 static Link *link_drop(Link *link) {
 879         if (!link)
 880                 return NULL;
 881
 882         assert(link->manager);
 883
 884         link_set_state(link, LINK_STATE_LINGER);
 885
 886         /* Drop all references from other links and manager. Note that async netlink calls may have
 887          * references to the link, and they will be dropped when we receive replies. */
 888
 889         link_drop_requests(link);
 890
 891         link_free_bound_to_list(link);
 892         link_free_bound_by_list(link);
 893
 894         link_clear_sr_iov_ifindices(link);
 895
 896         link_drop_from_master(link);
 897
 898         if (link->state_file)
 899                 (void) unlink(link->state_file);
 900
 901         link_clean(link);
 902
 903         STRV_FOREACH(n, link->alternative_names)
 904                 hashmap_remove(link->manager->links_by_name, *n);
 905         hashmap_remove(link->manager->links_by_name, link->ifname);
 906
 907         /* bonding master and its slaves have the same hardware address. */
 908         hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
 909
 910         /* The following must be called at last. */
 911         assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
 912         return link_unref(link);
 913 }
 914
 915 static int link_drop_foreign_config(Link *link) {
 916         int k, r;
 917
 918         assert(link);
 919         assert(link->manager);
 920
 921         /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
 922          * to remove loopback address or addresses used for root NFS. */
 923
 924         if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
 925                 return 0;
 926         if (FLAGS_SET(link->flags, IFF_LOOPBACK))
 927                 return 0;
 928         if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
 929                 return 0;
 930
 931         r = link_drop_foreign_routes(link);
 932
 933         k = link_drop_foreign_nexthops(link);
 934         if (k < 0 && r >= 0)
 935                 r = k;
 936
 937         k = link_drop_foreign_addresses(link);
 938         if (k < 0 && r >= 0)
 939                 r = k;
 940
 941         k = link_drop_foreign_neighbors(link);
 942         if (k < 0 && r >= 0)
 943                 r = k;
 944
 945         k = manager_drop_foreign_routing_policy_rules(link->manager);
 946         if (k < 0 && r >= 0)
 947                 r = k;
 948
 949         return r;
 950 }
 951
 952 static int link_drop_managed_config(Link *link) {
 953         int k, r;
 954
 955         assert(link);
 956         assert(link->manager);
 957
 958         r = link_drop_managed_routes(link);
 959
 960         k = link_drop_managed_nexthops(link);
 961         if (k < 0 && r >= 0)
 962                 r = k;
 963
 964         k = link_drop_managed_addresses(link);
 965         if (k < 0 && r >= 0)
 966                 r = k;
 967
 968         k = link_drop_managed_neighbors(link);
 969         if (k < 0 && r >= 0)
 970                 r = k;
 971
 972         k = link_drop_managed_routing_policy_rules(link);
 973         if (k < 0 && r >= 0)
 974                 r = k;
 975
 976         return r;
 977 }
 978
 979 static void link_foreignize_config(Link *link) {
 980         assert(link);
 981         assert(link->manager);
 982
 983         link_foreignize_routes(link);
 984         link_foreignize_nexthops(link);
 985         link_foreignize_addresses(link);
 986         link_foreignize_neighbors(link);
 987         link_foreignize_routing_policy_rules(link);
 988 }
 989
 990 static int link_configure(Link *link) {
 991         int r;
 992
 993         assert(link);
 994         assert(link->network);
 995         assert(link->state == LINK_STATE_INITIALIZED);
 996
 997         link_set_state(link, LINK_STATE_CONFIGURING);
 998
 999         r = link_new_bound_to_list(link);
1000         if (r < 0)
1001                 return r;
1002
1003         r = link_request_traffic_control(link);
1004         if (r < 0)
1005                 return r;
1006
1007         if (link->iftype == ARPHRD_CAN) {
1008                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1009                 r = link_request_to_set_can(link);
1010                 if (r < 0)
1011                         return r;
1012
1013                 return link_request_to_activate(link);
1014         }
1015
1016         r = link_request_sr_iov_vfs(link);
1017         if (r < 0)
1018                 return r;
1019
1020         r = link_set_sysctl(link);
1021         if (r < 0)
1022                 return r;
1023
1024         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1025         if (r < 0)
1026                 return r;
1027
1028         r = link_request_to_set_ipoib(link);
1029         if (r < 0)
1030                 return r;
1031
1032         r = link_request_to_set_flags(link);
1033         if (r < 0)
1034                 return r;
1035
1036         r = link_request_to_set_group(link);
1037         if (r < 0)
1038                 return r;
1039
1040         r = link_configure_mtu(link);
1041         if (r < 0)
1042                 return r;
1043
1044         r = link_request_to_set_addrgen_mode(link);
1045         if (r < 0)
1046                 return r;
1047
1048         r = link_request_to_set_master(link);
1049         if (r < 0)
1050                 return r;
1051
1052         r = link_request_stacked_netdevs(link);
1053         if (r < 0)
1054                 return r;
1055
1056         r = link_request_to_set_bond(link);
1057         if (r < 0)
1058                 return r;
1059
1060         r = link_request_to_set_bridge(link);
1061         if (r < 0)
1062                 return r;
1063
1064         r = link_request_to_set_bridge_vlan(link);
1065         if (r < 0)
1066                 return r;
1067
1068         r = link_request_to_activate(link);
1069         if (r < 0)
1070                 return r;
1071
1072         r = ipv4ll_configure(link);
1073         if (r < 0)
1074                 return r;
1075
1076         r = link_request_dhcp4_client(link);
1077         if (r < 0)
1078                 return r;
1079
1080         r = link_request_dhcp6_client(link);
1081         if (r < 0)
1082                 return r;
1083
1084         r = link_request_ndisc(link);
1085         if (r < 0)
1086                 return r;
1087
1088         r = link_request_dhcp_server(link);
1089         if (r < 0)
1090                 return r;
1091
1092         r = link_request_radv(link);
1093         if (r < 0)
1094                 return r;
1095
1096         r = link_lldp_rx_configure(link);
1097         if (r < 0)
1098                 return r;
1099
1100         r = link_lldp_tx_configure(link);
1101         if (r < 0)
1102                 return r;
1103
1104         r = link_drop_foreign_config(link);
1105         if (r < 0)
1106                 return r;
1107
1108         r = link_request_static_configs(link);
1109         if (r < 0)
1110                 return r;
1111
1112         if (!link_has_carrier(link))
1113                 return 0;
1114
1115         return link_acquire_dynamic_conf(link);
1116 }
1117
1118 static int link_get_network(Link *link, Network **ret) {
1119         Network *network;
1120         int r;
1121
1122         assert(link);
1123         assert(link->manager);
1124         assert(ret);
1125
1126         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1127                 bool warn = false;
1128
1129                 r = net_match_config(
1130                                 &network->match,
1131                                 link->dev,
1132                                 &link->hw_addr,
1133                                 &link->permanent_hw_addr,
1134                                 link->driver,
1135                                 link->iftype,
1136                                 link->kind,
1137                                 link->ifname,
1138                                 link->alternative_names,
1139                                 link->wlan_iftype,
1140                                 link->ssid,
1141                                 &link->bssid);
1142                 if (r < 0)
1143                         return r;
1144                 if (r == 0)
1145                         continue;
1146
1147                 if (network->match.ifname && link->dev) {
1148                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1149                         const char *attr;
1150
1151                         if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1152                                 (void) safe_atou8(attr, &name_assign_type);
1153
1154                         warn = name_assign_type == NET_NAME_ENUM;
1155                 }
1156
1157                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1158                               "found matching network '%s'%s.",
1159                               network->filename,
1160                               warn ? ", based on potentially unpredictable interface name" : "");
1161
1162                 if (network->unmanaged)
1163                         return -ENOENT;
1164
1165                 *ret = network;
1166                 return 0;
1167         }
1168
1169         return -ENOENT;
1170 }
1171
1172 static int link_reconfigure_impl(Link *link, bool force) {
1173         Network *network = NULL;
1174         NetDev *netdev = NULL;
1175         int r;
1176
1177         assert(link);
1178
1179         if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
1180                 return 0;
1181
1182         r = netdev_get(link->manager, link->ifname, &netdev);
1183         if (r < 0 && r != -ENOENT)
1184                 return r;
1185
1186         r = link_get_network(link, &network);
1187         if (r < 0 && r != -ENOENT)
1188                 return r;
1189
1190         if (link->state != LINK_STATE_UNMANAGED && !network)
1191                 /* If link is in initialized state, then link->network is also NULL. */
1192                 force = true;
1193
1194         if (link->network == network && !force)
1195                 return 0;
1196
1197         if (network) {
1198                 if (link->state == LINK_STATE_INITIALIZED)
1199                         log_link_info(link, "Configuring with %s.", network->filename);
1200                 else
1201                         log_link_info(link, "Reconfiguring with %s.", network->filename);
1202         } else
1203                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1204                               "Unmanaging interface.");
1205
1206         /* Dropping old .network file */
1207         r = link_stop_engines(link, false);
1208         if (r < 0)
1209                 return r;
1210
1211         link_drop_requests(link);
1212
1213         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1214                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1215                  * routes, and so on) foreign, and then drop unnecessary configs later by
1216                  * link_drop_foreign_config() in link_configure().
1217                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1218                  * here we need to drop the configs such as addresses, routes, and so on configured by
1219                  * the previously assigned .network file. */
1220                 link_foreignize_config(link);
1221         else {
1222                 /* Remove all managed configs. Note, foreign configs are removed in later by
1223                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1224                 r = link_drop_managed_config(link);
1225                 if (r < 0)
1226                         return r;
1227         }
1228
1229         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1230          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1231          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1232          * map here, as it depends on .network files assigned to other links. */
1233         link_free_bound_to_list(link);
1234
1235         link_free_engines(link);
1236         link->network = network_unref(link->network);
1237
1238         netdev_unref(link->netdev);
1239         link->netdev = netdev_ref(netdev);
1240
1241         if (!network) {
1242                 link_set_state(link, LINK_STATE_UNMANAGED);
1243                 return 0;
1244         }
1245
1246         /* Then, apply new .network file */
1247         link->network = network_ref(network);
1248         link_update_operstate(link, true);
1249         link_dirty(link);
1250
1251         link_set_state(link, LINK_STATE_INITIALIZED);
1252         link->activated = false;
1253
1254         r = link_configure(link);
1255         if (r < 0)
1256                 return r;
1257
1258         return 1;
1259 }
1260
1261 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1262         int r;
1263
1264         assert(link);
1265
1266         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1267         if (r <= 0)
1268                 return r;
1269
1270         r = link_reconfigure_impl(link, force);
1271         if (r < 0) {
1272                 link_enter_failed(link);
1273                 return 0;
1274         }
1275
1276         return r;
1277 }
1278
1279 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1280         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1281 }
1282
1283 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1284         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1285 }
1286
1287 static int link_reconfigure_after_sleep_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1288         int r;
1289
1290         assert(link);
1291
1292         r = link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1293         if (r != 0)
1294                 return r;
1295
1296         /* r == 0 means an error occurs, the link is unmanaged, or the matching network file is unchanged. */
1297         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1298                 return 0;
1299
1300         /* re-request static configs, and restart engines. */
1301         r = link_stop_engines(link, false);
1302         if (r < 0) {
1303                 link_enter_failed(link);
1304                 return 0;
1305         }
1306
1307         r = link_acquire_dynamic_conf(link);
1308         if (r < 0) {
1309                 link_enter_failed(link);
1310                 return 0;
1311         }
1312
1313         r = link_request_static_configs(link);
1314         if (r < 0) {
1315                 link_enter_failed(link);
1316                 return 0;
1317         }
1318
1319         return 0;
1320 }
1321
1322 static int link_reconfigure_internal(Link *link, link_netlink_message_handler_t callback) {
1323         int r;
1324
1325         assert(link);
1326         assert(callback);
1327
1328         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1329          * the function from being called multiple times simultaneously, refuse to reconfigure the
1330          * interface in these cases. */
1331         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1332                 return 0; /* 0 means no-op. */
1333
1334         r = link_call_getlink(link, callback);
1335         if (r < 0)
1336                 return r;
1337
1338         return 1; /* 1 means the interface will be reconfigured. */
1339 }
1340
1341 int link_reconfigure(Link *link, bool force) {
1342         return link_reconfigure_internal(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1343 }
1344
1345 int link_reconfigure_after_sleep(Link *link) {
1346         return link_reconfigure_internal(link, link_reconfigure_after_sleep_handler);
1347 }
1348
1349 static int link_initialized_and_synced(Link *link) {
1350         int r;
1351
1352         assert(link);
1353         assert(link->manager);
1354
1355         if (link->manager->test_mode) {
1356                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1357                 link_set_state(link, LINK_STATE_UNMANAGED);
1358                 return 0;
1359         }
1360
1361         /* This may get called either from the asynchronous netlink callback,
1362          * or directly from link_check_initialized() if running in a container. */
1363         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1364                 return 0;
1365
1366         log_link_debug(link, "Link state is up-to-date");
1367         link_set_state(link, LINK_STATE_INITIALIZED);
1368
1369         r = link_new_bound_by_list(link);
1370         if (r < 0)
1371                 return r;
1372
1373         r = link_handle_bound_by_list(link);
1374         if (r < 0)
1375                 return r;
1376
1377         return link_reconfigure_impl(link, /* force = */ false);
1378 }
1379
1380 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1381         int r;
1382
1383         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1384         if (r <= 0)
1385                 return r;
1386
1387         r = link_initialized_and_synced(link);
1388         if (r < 0)
1389                 link_enter_failed(link);
1390
1391         return 0;
1392 }
1393
1394 static int link_initialized(Link *link, sd_device *device) {
1395         int r;
1396
1397         assert(link);
1398         assert(device);
1399
1400         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1401          * or sysattrs) may be outdated. */
1402         device_unref_and_replace(link->dev, device);
1403
1404         r = link_set_sr_iov_ifindices(link);
1405         if (r < 0)
1406                 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1407
1408         /* Do not ignore unamanaged state case here. If an interface is renamed after being once
1409          * configured, and the corresponding .network file has Name= in [Match] section, then the
1410          * interface may be already in unmanaged state. See #20657. */
1411         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED))
1412                 return 0;
1413
1414         log_link_debug(link, "udev initialized link");
1415         link_set_state(link, LINK_STATE_INITIALIZED);
1416
1417         /* udev has initialized the link, but we don't know if we have yet
1418          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1419          * when it returns we know that the pending NEWLINKs have already been
1420          * processed and that we are up-to-date */
1421
1422         return link_call_getlink(link, link_initialized_handler);
1423 }
1424
1425 static int link_check_initialized(Link *link) {
1426         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1427         int r;
1428
1429         assert(link);
1430
1431         if (!udev_available())
1432                 return link_initialized_and_synced(link);
1433
1434         /* udev should be around */
1435         r = sd_device_new_from_ifindex(&device, link->ifindex);
1436         if (r < 0) {
1437                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1438                 return 0;
1439         }
1440
1441         r = sd_device_get_is_initialized(device);
1442         if (r < 0)
1443                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1444         if (r == 0) {
1445                 /* not yet ready */
1446                 log_link_debug(link, "link pending udev initialization...");
1447                 return 0;
1448         }
1449
1450         r = device_is_renaming(device);
1451         if (r < 0)
1452                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1453         if (r > 0) {
1454                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1455                 return 0;
1456         }
1457
1458         return link_initialized(link, device);
1459 }
1460
1461 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1462         int r, ifindex;
1463         Link *link;
1464
1465         assert(m);
1466         assert(device);
1467
1468         r = sd_device_get_ifindex(device, &ifindex);
1469         if (r < 0)
1470                 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1471
1472         r = link_get_by_index(m, ifindex, &link);
1473         if (r < 0) {
1474                 /* This error is not critical, as the corresponding rtnl message may be received later. */
1475                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1476                 return 0;
1477         }
1478
1479         /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1480          * object here. It will be removed only when rtnetlink says so. */
1481         if (action == SD_DEVICE_REMOVE) {
1482                 link->dev = sd_device_unref(link->dev);
1483                 return 0;
1484         }
1485
1486         r = device_is_renaming(device);
1487         if (r < 0)
1488                 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1489         if (r > 0) {
1490                 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1491                 /* TODO:
1492                  * What happens when a device is initialized, then soon renamed after that? When we detect
1493                  * such, maybe we should cancel or postpone all queued requests for the interface. */
1494                 return 0;
1495         }
1496
1497         r = link_initialized(link, device);
1498         if (r < 0)
1499                 link_enter_failed(link);
1500
1501         return 0;
1502 }
1503
1504 static int link_carrier_gained(Link *link) {
1505         bool force_reconfigure;
1506         int r;
1507
1508         assert(link);
1509
1510         r = event_source_disable(link->carrier_lost_timer);
1511         if (r < 0)
1512                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1513
1514         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1515          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1516          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1517          * restarted, and the correct network information will be gained.
1518          *
1519          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1520          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1521          * already assigned to the interface (in that case, the .network file does not have the SSID=
1522          * setting in the [Match] section), and the interface is already being configured. Of course,
1523          * there may exist another .network file with higher priority and a matching SSID= setting. But
1524          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1525          *
1526          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1527          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1528         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1529         link->previous_ssid = mfree(link->previous_ssid);
1530
1531         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1532                 /* At this stage, both wlan and link information should be up-to-date. Hence,
1533                  * it is not necessary to call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or
1534                  * NL80211_CMD_GET_STATION commands, and simply call link_reconfigure_impl().
1535                  * Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1536                 r = link_reconfigure_impl(link, force_reconfigure);
1537                 if (r != 0)
1538                         return r;
1539         }
1540
1541         r = link_handle_bound_by_list(link);
1542         if (r < 0)
1543                 return r;
1544
1545         if (link->iftype == ARPHRD_CAN)
1546                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1547                 return 0;
1548
1549         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1550                 r = link_acquire_dynamic_conf(link);
1551                 if (r < 0)
1552                         return r;
1553
1554                 r = link_request_static_configs(link);
1555                 if (r < 0)
1556                         return r;
1557         }
1558
1559         return 0;
1560 }
1561
1562 static int link_carrier_lost_impl(Link *link) {
1563         int r, ret = 0;
1564
1565         assert(link);
1566
1567         link->previous_ssid = mfree(link->previous_ssid);
1568
1569         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1570                 return 0;
1571
1572         if (!link->network)
1573                 return 0;
1574
1575         r = link_stop_engines(link, false);
1576         if (r < 0)
1577                 ret = r;
1578
1579         r = link_drop_managed_config(link);
1580         if (r < 0 && ret >= 0)
1581                 ret = r;
1582
1583         return ret;
1584 }
1585
1586 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1587         Link *link = userdata;
1588         int r;
1589
1590         assert(link);
1591
1592         r = link_carrier_lost_impl(link);
1593         if (r < 0) {
1594                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1595                 link_enter_failed(link);
1596         }
1597
1598         return 0;
1599 }
1600
1601 static int link_carrier_lost(Link *link) {
1602         uint16_t dhcp_mtu;
1603         usec_t usec;
1604         int r;
1605
1606         assert(link);
1607
1608         r = link_handle_bound_by_list(link);
1609         if (r < 0)
1610                 return r;
1611
1612         if (link->iftype == ARPHRD_CAN)
1613                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1614                 return 0;
1615
1616         if (!link->network)
1617                 return 0;
1618
1619         if (link->network->ignore_carrier_loss_set)
1620                 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1621                 usec = link->network->ignore_carrier_loss_usec;
1622
1623         else if (link->network->bond && link->wlan_iftype > 0)
1624                 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1625                  * carrier to be lost. See #19832. */
1626                 usec = 3 * USEC_PER_SEC;
1627
1628         else if (link->network->dhcp_use_mtu &&
1629                  link->dhcp_lease &&
1630                  sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1631                  dhcp_mtu != link->original_mtu)
1632                 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1633                  * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1634                  * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1635                 usec = 5 * USEC_PER_SEC;
1636
1637         else
1638                 /* Otherwise, use the currently set value. */
1639                 usec = link->network->ignore_carrier_loss_usec;
1640
1641         if (usec == USEC_INFINITY)
1642                 return 0;
1643
1644         if (usec == 0)
1645                 return link_carrier_lost_impl(link);
1646
1647         return event_reset_time_relative(link->manager->event,
1648                                          &link->carrier_lost_timer,
1649                                          CLOCK_BOOTTIME,
1650                                          usec,
1651                                          0,
1652                                          link_carrier_lost_handler,
1653                                          link,
1654                                          0,
1655                                          "link-carrier-loss",
1656                                          true);
1657 }
1658
1659 static int link_admin_state_up(Link *link) {
1660         int r;
1661
1662         assert(link);
1663
1664         /* This is called every time an interface admin state changes to up;
1665          * specifically, when IFF_UP flag changes from unset to set. */
1666
1667         if (!link->network)
1668                 return 0;
1669
1670         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1671                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1672                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1673         }
1674
1675         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1676          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1677         r = link_set_ipv6_mtu(link);
1678         if (r < 0)
1679                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1680
1681         return 0;
1682 }
1683
1684 static int link_admin_state_down(Link *link) {
1685         assert(link);
1686
1687         if (!link->network)
1688                 return 0;
1689
1690         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1691                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1692                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1693         }
1694
1695         return 0;
1696 }
1697
1698 static bool link_is_enslaved(Link *link) {
1699         if (link->flags & IFF_SLAVE)
1700                 return true;
1701
1702         if (link->master_ifindex > 0)
1703                 return true;
1704
1705         return false;
1706 }
1707
1708 static LinkAddressState address_state_from_scope(uint8_t scope) {
1709         if (scope < RT_SCOPE_SITE)
1710                 /* universally accessible addresses found */
1711                 return LINK_ADDRESS_STATE_ROUTABLE;
1712
1713         if (scope < RT_SCOPE_HOST)
1714                 /* only link or site local addresses found */
1715                 return LINK_ADDRESS_STATE_DEGRADED;
1716
1717         /* no useful addresses found */
1718         return LINK_ADDRESS_STATE_OFF;
1719 }
1720
1721 void link_update_operstate(Link *link, bool also_update_master) {
1722         LinkOperationalState operstate;
1723         LinkCarrierState carrier_state;
1724         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1725         LinkOnlineState online_state;
1726         _cleanup_strv_free_ char **p = NULL;
1727         uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1728         bool changed = false;
1729         Address *address;
1730
1731         assert(link);
1732
1733         if (link->kernel_operstate == IF_OPER_DORMANT)
1734                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1735         else if (link_has_carrier(link)) {
1736                 if (link_is_enslaved(link))
1737                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1738                 else
1739                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1740         } else if (link->flags & IFF_UP)
1741                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1742         else
1743                 carrier_state = LINK_CARRIER_STATE_OFF;
1744
1745         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1746                 Link *slave;
1747
1748                 SET_FOREACH(slave, link->slaves) {
1749                         link_update_operstate(slave, false);
1750
1751                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1752                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1753                 }
1754         }
1755
1756         SET_FOREACH(address, link->addresses) {
1757                 if (!address_is_ready(address))
1758                         continue;
1759
1760                 if (address->family == AF_INET)
1761                         ipv4_scope = MIN(ipv4_scope, address->scope);
1762
1763                 if (address->family == AF_INET6)
1764                         ipv6_scope = MIN(ipv6_scope, address->scope);
1765         }
1766
1767         ipv4_address_state = address_state_from_scope(ipv4_scope);
1768         ipv6_address_state = address_state_from_scope(ipv6_scope);
1769         address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1770
1771         /* Mapping of address and carrier state vs operational state
1772          *                                                     carrier state
1773          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1774          *                 ------------------------------------------------------------------------------
1775          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1776          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
1777          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
1778          */
1779
1780         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1781                 operstate = (LinkOperationalState) carrier_state;
1782         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1783                 operstate = LINK_OPERSTATE_ROUTABLE;
1784         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1785                 operstate = LINK_OPERSTATE_DEGRADED;
1786         else
1787                 operstate = LINK_OPERSTATE_ENSLAVED;
1788
1789         /* Only determine online state for managed links with RequiredForOnline=yes */
1790         if (!link->network || !link->network->required_for_online)
1791                 online_state = _LINK_ONLINE_STATE_INVALID;
1792         else if (operstate < link->network->required_operstate_for_online.min ||
1793                  operstate > link->network->required_operstate_for_online.max)
1794                 online_state = LINK_ONLINE_STATE_OFFLINE;
1795         else {
1796                 AddressFamily required_family = link->network->required_family_for_online;
1797                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1798                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1799
1800                 /* The operational state is within the range required for online.
1801                  * If a particular address family is also required, we might revert
1802                  * to offline in the blocks below. */
1803                 online_state = LINK_ONLINE_STATE_ONLINE;
1804
1805                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1806                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1807                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1808                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1809                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1810                 }
1811
1812                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1813                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1814                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1815                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1816                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1817                 }
1818         }
1819
1820         if (link->carrier_state != carrier_state) {
1821                 link->carrier_state = carrier_state;
1822                 changed = true;
1823                 if (strv_extend(&p, "CarrierState") < 0)
1824                         log_oom();
1825         }
1826
1827         if (link->address_state != address_state) {
1828                 link->address_state = address_state;
1829                 changed = true;
1830                 if (strv_extend(&p, "AddressState") < 0)
1831                         log_oom();
1832         }
1833
1834         if (link->ipv4_address_state != ipv4_address_state) {
1835                 link->ipv4_address_state = ipv4_address_state;
1836                 changed = true;
1837                 if (strv_extend(&p, "IPv4AddressState") < 0)
1838                         log_oom();
1839         }
1840
1841         if (link->ipv6_address_state != ipv6_address_state) {
1842                 link->ipv6_address_state = ipv6_address_state;
1843                 changed = true;
1844                 if (strv_extend(&p, "IPv6AddressState") < 0)
1845                         log_oom();
1846         }
1847
1848         if (link->operstate != operstate) {
1849                 link->operstate = operstate;
1850                 changed = true;
1851                 if (strv_extend(&p, "OperationalState") < 0)
1852                         log_oom();
1853         }
1854
1855         if (link->online_state != online_state) {
1856                 link->online_state = online_state;
1857                 changed = true;
1858                 if (strv_extend(&p, "OnlineState") < 0)
1859                         log_oom();
1860         }
1861
1862         if (p)
1863                 link_send_changed_strv(link, p);
1864         if (changed)
1865                 link_dirty(link);
1866
1867         if (also_update_master) {
1868                 Link *master;
1869
1870                 if (link_get_master(link, &master) >= 0)
1871                         link_update_operstate(master, true);
1872         }
1873 }
1874
1875 #define FLAG_STRING(string, flag, old, new)                      \
1876         (((old ^ new) & flag)                                    \
1877          ? ((old & flag) ? (" -" string) : (" +" string))        \
1878          : "")
1879
1880 static int link_update_flags(Link *link, sd_netlink_message *message) {
1881         bool link_was_admin_up, had_carrier;
1882         uint8_t operstate;
1883         unsigned flags;
1884         int r;
1885
1886         assert(link);
1887         assert(message);
1888
1889         r = sd_rtnl_message_link_get_flags(message, &flags);
1890         if (r < 0)
1891                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1892
1893         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1894         if (r == -ENODATA)
1895                 /* If we got a message without operstate, assume the state was unchanged. */
1896                 operstate = link->kernel_operstate;
1897         else if (r < 0)
1898                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1899
1900         if (link->flags == flags && link->kernel_operstate == operstate)
1901                 return 0;
1902
1903         if (link->flags != flags) {
1904                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1905
1906                 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",
1907                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1908                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1909                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1910                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
1911                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1912                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1913                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1914                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1915                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1916                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1917                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1918                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1919                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1920                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1921                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1922                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1923                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1924                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1925                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1926
1927                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1928                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1929                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1930                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1931                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1932                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1933                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1934                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1935
1936                 if (unknown_flags_added)
1937                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1938
1939                 if (unknown_flags_removed)
1940                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1941         }
1942
1943         link_was_admin_up = link->flags & IFF_UP;
1944         had_carrier = link_has_carrier(link);
1945
1946         link->flags = flags;
1947         link->kernel_operstate = operstate;
1948
1949         link_update_operstate(link, true);
1950
1951         if (!link_was_admin_up && (link->flags & IFF_UP)) {
1952                 log_link_info(link, "Link UP");
1953
1954                 r = link_admin_state_up(link);
1955                 if (r < 0)
1956                         return r;
1957         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1958                 log_link_info(link, "Link DOWN");
1959
1960                 r = link_admin_state_down(link);
1961                 if (r < 0)
1962                         return r;
1963         }
1964
1965         if (!had_carrier && link_has_carrier(link)) {
1966                 log_link_info(link, "Gained carrier");
1967
1968                 r = link_carrier_gained(link);
1969                 if (r < 0)
1970                         return r;
1971         } else if (had_carrier && !link_has_carrier(link)) {
1972                 log_link_info(link, "Lost carrier");
1973
1974                 r = link_carrier_lost(link);
1975                 if (r < 0)
1976                         return r;
1977         }
1978
1979         return 0;
1980 }
1981
1982 static int link_update_master(Link *link, sd_netlink_message *message) {
1983         int master_ifindex, r;
1984
1985         assert(link);
1986         assert(message);
1987
1988         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1989         if (r == -ENODATA)
1990                 return 0;
1991         if (r < 0)
1992                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1993
1994         if (master_ifindex == link->ifindex)
1995                 master_ifindex = 0;
1996
1997         if (master_ifindex == link->master_ifindex)
1998                 return 0;
1999
2000         if (link->master_ifindex == 0)
2001                 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2002         else if (master_ifindex == 0)
2003                 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2004         else
2005                 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2006                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2007
2008         link_drop_from_master(link);
2009
2010         link->master_ifindex = master_ifindex;
2011
2012         r = link_append_to_master(link);
2013         if (r < 0)
2014                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2015
2016         return 0;
2017 }
2018
2019 static int link_update_driver(Link *link, sd_netlink_message *message) {
2020         int r;
2021
2022         assert(link);
2023         assert(link->manager);
2024         assert(message);
2025
2026         /* Driver is already read. Assuming the driver is never changed. */
2027         if (link->driver)
2028                 return 0;
2029
2030         /* When udevd is running, read the driver after the interface is initialized by udevd.
2031          * Otherwise, ethtool may not work correctly. See issue #22538.
2032          * When udevd is not running, read the value when the interface is detected. */
2033         if (link->state != (udev_available() ? LINK_STATE_INITIALIZED : LINK_STATE_PENDING))
2034                 return 0;
2035
2036         r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2037         if (r < 0) {
2038                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2039                 return 0;
2040         }
2041
2042         log_link_debug(link, "Found driver: %s", strna(link->driver));
2043
2044         if (streq_ptr(link->driver, "dsa")) {
2045                 uint32_t dsa_master_ifindex = 0;
2046
2047                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2048                 if (r < 0 && r != -ENODATA)
2049                         return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2050
2051                 if (dsa_master_ifindex > INT_MAX) {
2052                         log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2053                                        dsa_master_ifindex);
2054                         dsa_master_ifindex = 0;
2055                 }
2056
2057                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2058         }
2059
2060         return 0;
2061 }
2062
2063 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2064         int r;
2065
2066         assert(link);
2067         assert(link->manager);
2068         assert(message);
2069
2070         if (link->permanent_hw_addr.length > 0)
2071                 return 0;
2072
2073         /* When udevd is running, read the permanent hardware address after the interface is
2074          * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2075          * When udevd is not running, read the value when the interface is detected. */
2076         if (link->state != (udev_available() ? LINK_STATE_INITIALIZED : LINK_STATE_PENDING))
2077                 return 0;
2078
2079         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2080         if (r < 0) {
2081                 if (r != -ENODATA)
2082                         return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2083
2084                 if (netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL) >= 0) {
2085                         /* Fallback to ethtool, if the link has a hardware address. */
2086                         r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2087                         if (r < 0)
2088                                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2089                 }
2090         }
2091
2092         if (link->permanent_hw_addr.length > 0)
2093                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2094
2095         return 0;
2096 }
2097
2098 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2099         struct hw_addr_data addr;
2100         int r;
2101
2102         assert(link);
2103         assert(message);
2104
2105         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2106         if (r < 0 && r != -ENODATA)
2107                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2108
2109         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2110         if (r == -ENODATA)
2111                 return 0;
2112         if (r < 0)
2113                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2114
2115         if (hw_addr_equal(&link->hw_addr, &addr))
2116                 return 0;
2117
2118         if (link->hw_addr.length == 0)
2119                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2120         else {
2121                 log_link_debug(link, "Hardware address is changed: %s %s %s",
2122                                HW_ADDR_TO_STR(&link->hw_addr),
2123                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2124                                HW_ADDR_TO_STR(&addr));
2125
2126                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2127         }
2128
2129         link->hw_addr = addr;
2130
2131         if (!hw_addr_is_null(&link->hw_addr)) {
2132                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2133                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2134                         /* bonding master and its slaves have the same hardware address. */
2135                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2136                 if (r < 0)
2137                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2138         }
2139
2140         r = ipv4ll_update_mac(link);
2141         if (r < 0)
2142                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2143
2144         r = ipv4ll_update_mac(link);
2145         if (r < 0)
2146                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2147
2148         r = dhcp4_update_mac(link);
2149         if (r < 0)
2150                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2151
2152         r = dhcp6_update_mac(link);
2153         if (r < 0)
2154                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2155
2156         r = radv_update_mac(link);
2157         if (r < 0)
2158                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2159
2160         if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2161                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2162                 if (r < 0)
2163                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2164         }
2165
2166         if (link->lldp_rx) {
2167                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2168                 if (r < 0)
2169                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2170         }
2171
2172         if (link->lldp_tx) {
2173                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2174                 if (r < 0)
2175                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2176         }
2177
2178         return 0;
2179 }
2180
2181 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2182         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2183         int r;
2184
2185         assert(link);
2186         assert(message);
2187
2188         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2189         if (r == -ENODATA)
2190                 return 0;
2191         if (r < 0)
2192                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2193         if (mtu == 0)
2194                 return 0;
2195
2196         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2197         if (r < 0 && r != -ENODATA)
2198                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2199
2200         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2201         if (r < 0 && r != -ENODATA)
2202                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2203
2204         if (max_mtu == 0)
2205                 max_mtu = UINT32_MAX;
2206
2207         link->min_mtu = min_mtu;
2208         link->max_mtu = max_mtu;
2209
2210         if (link->original_mtu == 0) {
2211                 link->original_mtu = mtu;
2212                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2213                                link->original_mtu, link->min_mtu, link->max_mtu);
2214         }
2215
2216         if (link->mtu == mtu)
2217                 return 0;
2218
2219         if (link->mtu != 0)
2220                 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2221                                link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2222                                link->min_mtu, link->max_mtu);
2223
2224         link->mtu = mtu;
2225
2226         if (link->dhcp_client) {
2227                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2228                 if (r < 0)
2229                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2230         }
2231
2232         if (link->radv) {
2233                 r = sd_radv_set_mtu(link->radv, link->mtu);
2234                 if (r < 0)
2235                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2236         }
2237
2238         return 0;
2239 }
2240
2241 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2242         _cleanup_strv_free_ char **altnames = NULL;
2243         int r;
2244
2245         assert(link);
2246         assert(message);
2247
2248         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2249         if (r == -ENODATA)
2250                 /* The message does not have IFLA_PROP_LIST container attribute. It does not means the
2251                  * interface has no alternative name. */
2252                 return 0;
2253         if (r < 0)
2254                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2255
2256         if (strv_equal(altnames, link->alternative_names))
2257                 return 0;
2258
2259         STRV_FOREACH(n, link->alternative_names)
2260                 hashmap_remove(link->manager->links_by_name, *n);
2261
2262         strv_free_and_replace(link->alternative_names, altnames);
2263
2264         STRV_FOREACH(n, link->alternative_names) {
2265                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2266                 if (r < 0)
2267                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2268         }
2269
2270         return 0;
2271 }
2272
2273 static int link_update_name(Link *link, sd_netlink_message *message) {
2274         char ifname_from_index[IF_NAMESIZE];
2275         const char *ifname;
2276         int r;
2277
2278         assert(link);
2279         assert(message);
2280
2281         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2282         if (r == -ENODATA)
2283                 /* Hmm?? But ok. */
2284                 return 0;
2285         if (r < 0)
2286                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2287
2288         if (streq(ifname, link->ifname))
2289                 return 0;
2290
2291         r = format_ifname(link->ifindex, ifname_from_index);
2292         if (r < 0)
2293                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2294
2295         if (!streq(ifname, ifname_from_index)) {
2296                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2297                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2298                                ifname, ifname_from_index);
2299                 return 0;
2300         }
2301
2302         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2303
2304         hashmap_remove(link->manager->links_by_name, link->ifname);
2305
2306         r = free_and_strdup(&link->ifname, ifname);
2307         if (r < 0)
2308                 return log_oom_debug();
2309
2310         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2311         if (r < 0)
2312                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2313
2314         if (link->dhcp_client) {
2315                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2316                 if (r < 0)
2317                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2318         }
2319
2320         if (link->dhcp6_client) {
2321                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2322                 if (r < 0)
2323                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2324         }
2325
2326         if (link->ndisc) {
2327                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2328                 if (r < 0)
2329                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2330         }
2331
2332         if (link->dhcp_server) {
2333                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2334                 if (r < 0)
2335                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2336         }
2337
2338         if (link->radv) {
2339                 r = sd_radv_set_ifname(link->radv, link->ifname);
2340                 if (r < 0)
2341                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2342         }
2343
2344         if (link->lldp_rx) {
2345                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2346                 if (r < 0)
2347                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2348         }
2349
2350         if (link->lldp_tx) {
2351                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2352                 if (r < 0)
2353                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2354         }
2355
2356         if (link->ipv4ll) {
2357                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2358                 if (r < 0)
2359                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2360         }
2361
2362         r = ipv4acd_set_ifname(link);
2363         if (r < 0)
2364                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2365
2366         return 0;
2367 }
2368
2369 static int link_update(Link *link, sd_netlink_message *message) {
2370         int r;
2371
2372         assert(link);
2373         assert(message);
2374
2375         r = link_update_name(link, message);
2376         if (r < 0)
2377                 return r;
2378
2379         r = link_update_alternative_names(link, message);
2380         if (r < 0)
2381                 return r;
2382
2383         r = link_update_mtu(link, message);
2384         if (r < 0)
2385                 return r;
2386
2387         r = link_update_driver(link, message);
2388         if (r < 0)
2389                 return r;
2390
2391         r = link_update_permanent_hardware_address(link, message);
2392         if (r < 0)
2393                 return r;
2394
2395         r = link_update_hardware_address(link, message);
2396         if (r < 0)
2397                 return r;
2398
2399         r = link_update_master(link, message);
2400         if (r < 0)
2401                 return r;
2402
2403         r = link_update_ipv6ll_addrgen_mode(link, message);
2404         if (r < 0)
2405                 return r;
2406
2407         return link_update_flags(link, message);
2408 }
2409
2410 static Link *link_drop_or_unref(Link *link) {
2411         if (!link)
2412                 return NULL;
2413         if (!link->manager)
2414                 return link_unref(link);
2415         return link_drop(link);
2416 }
2417
2418 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2419
2420 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2421         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2422         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2423         unsigned short iftype;
2424         int r, ifindex;
2425
2426         assert(manager);
2427         assert(message);
2428         assert(ret);
2429
2430         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2431         if (r < 0)
2432                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2433         else if (ifindex <= 0)
2434                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2435
2436         r = sd_rtnl_message_link_get_type(message, &iftype);
2437         if (r < 0)
2438                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2439
2440         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2441         if (r < 0)
2442                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2443
2444         /* check for link kind */
2445         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2446         if (r >= 0) {
2447                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2448                 if (r < 0 && r != -ENODATA)
2449                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2450                 r = sd_netlink_message_exit_container(message);
2451                 if (r < 0)
2452                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2453         }
2454
2455         if (!manager->test_mode) {
2456                 /* Do not update state files when running in test mode. */
2457                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2458                         return log_oom_debug();
2459
2460                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2461                         return log_oom_debug();
2462
2463                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2464                         return log_oom_debug();
2465         }
2466
2467         link = new(Link, 1);
2468         if (!link)
2469                 return -ENOMEM;
2470
2471         *link = (Link) {
2472                 .n_ref = 1,
2473                 .state = LINK_STATE_PENDING,
2474                 .online_state = _LINK_ONLINE_STATE_INVALID,
2475                 .ifindex = ifindex,
2476                 .iftype = iftype,
2477                 .ifname = TAKE_PTR(ifname),
2478                 .kind = TAKE_PTR(kind),
2479
2480                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2481
2482                 .state_file = TAKE_PTR(state_file),
2483                 .lease_file = TAKE_PTR(lease_file),
2484                 .lldp_file = TAKE_PTR(lldp_file),
2485
2486                 .n_dns = UINT_MAX,
2487                 .dns_default_route = -1,
2488                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2489                 .mdns = _RESOLVE_SUPPORT_INVALID,
2490                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2491                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2492         };
2493
2494         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2495         if (r < 0)
2496                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2497
2498         link->manager = manager;
2499
2500         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2501         if (r < 0)
2502                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2503
2504         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2505                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2506
2507         *ret = TAKE_PTR(link);
2508         return 0;
2509 }
2510
2511 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2512         Link *link = NULL;
2513         NetDev *netdev = NULL;
2514         uint16_t type;
2515         const char *name;
2516         int r, ifindex;
2517
2518         assert(rtnl);
2519         assert(message);
2520         assert(manager);
2521
2522         if (sd_netlink_message_is_error(message)) {
2523                 r = sd_netlink_message_get_errno(message);
2524                 if (r < 0)
2525                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2526
2527                 return 0;
2528         }
2529
2530         r = sd_netlink_message_get_type(message, &type);
2531         if (r < 0) {
2532                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2533                 return 0;
2534         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2535                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2536                 return 0;
2537         }
2538
2539         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2540         if (r < 0) {
2541                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2542                 return 0;
2543         } else if (ifindex <= 0) {
2544                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2545                 return 0;
2546         }
2547
2548         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2549         if (r < 0) {
2550                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2551                 return 0;
2552         }
2553
2554         (void) link_get_by_index(manager, ifindex, &link);
2555         (void) netdev_get(manager, name, &netdev);
2556
2557         switch (type) {
2558         case RTM_NEWLINK:
2559                 if (netdev) {
2560                         /* netdev exists, so make sure the ifindex matches */
2561                         r = netdev_set_ifindex(netdev, message);
2562                         if (r < 0) {
2563                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2564                                 return 0;
2565                         }
2566                 }
2567
2568                 if (!link) {
2569                         /* link is new, so add it */
2570                         r = link_new(manager, message, &link);
2571                         if (r < 0) {
2572                                 log_warning_errno(r, "Could not process new link message: %m");
2573                                 return 0;
2574                         }
2575
2576                         r = link_update(link, message);
2577                         if (r < 0) {
2578                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2579                                 link_enter_failed(link);
2580                                 return 0;
2581                         }
2582
2583                         r = link_check_initialized(link);
2584                         if (r < 0) {
2585                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2586                                 link_enter_failed(link);
2587                                 return 0;
2588                         }
2589                 } else {
2590                         r = link_update(link, message);
2591                         if (r < 0) {
2592                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2593                                 link_enter_failed(link);
2594                                 return 0;
2595                         }
2596                 }
2597                 break;
2598
2599         case RTM_DELLINK:
2600                 link_drop(link);
2601                 netdev_drop(netdev);
2602                 break;
2603
2604         default:
2605                 assert_not_reached();
2606         }
2607
2608         return 1;
2609 }
2610
2611 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2612         uint16_t message_type;
2613         int r;
2614
2615         assert(m);
2616         assert(link);
2617         assert(error_msg);
2618
2619         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2620                 return 0;
2621
2622         r = sd_netlink_message_get_errno(m);
2623         if (r < 0) {
2624                 log_link_message_warning_errno(link, m, r, error_msg);
2625                 link_enter_failed(link);
2626                 return 0;
2627         }
2628
2629         r = sd_netlink_message_get_type(m, &message_type);
2630         if (r < 0) {
2631                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2632                 return 0;
2633         }
2634         if (message_type != RTM_NEWLINK) {
2635                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2636                 return 0;
2637         }
2638
2639         r = link_update(link, m);
2640         if (r < 0) {
2641                 link_enter_failed(link);
2642                 return 0;
2643         }
2644
2645         return 1;
2646 }
2647
2648 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2649         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2650         int r;
2651
2652         assert(link);
2653         assert(link->manager);
2654         assert(link->manager->rtnl);
2655         assert(callback);
2656
2657         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2658         if (r < 0)
2659                 return r;
2660
2661         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2662                                link_netlink_destroy_callback, link);
2663         if (r < 0)
2664                 return r;
2665
2666         link_ref(link);
2667         return 0;
2668 }
2669
2670 static const char* const link_state_table[_LINK_STATE_MAX] = {
2671         [LINK_STATE_PENDING]     = "pending",
2672         [LINK_STATE_INITIALIZED] = "initialized",
2673         [LINK_STATE_CONFIGURING] = "configuring",
2674         [LINK_STATE_CONFIGURED]  = "configured",
2675         [LINK_STATE_UNMANAGED]   = "unmanaged",
2676         [LINK_STATE_FAILED]      = "failed",
2677         [LINK_STATE_LINGER]      = "linger",
2678 };
2679
2680 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2681
2682 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2683         _cleanup_free_ char *str = NULL;
2684         static const char* map[] = {
2685                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2686                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid.*/
2687                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2688                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2689                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2690                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2691                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2692                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2693                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2694                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2695                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2696                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2697                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast.*/
2698                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2699                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2700                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2701                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2702                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2703                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2704         };
2705
2706         assert(ret);
2707
2708         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2709                 if (FLAGS_SET(flags, 1 << i) && map[i])
2710                         if (!strextend_with_separator(&str, ",", map[i]))
2711                                 return -ENOMEM;
2712
2713         *ret = TAKE_PTR(str);
2714         return 0;
2715 }
2716
2717 static const char * const kernel_operstate_table[] = {
2718         [IF_OPER_UNKNOWN]        = "unknown",
2719         [IF_OPER_NOTPRESENT]     = "not-present",
2720         [IF_OPER_DOWN]           = "down",
2721         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2722         [IF_OPER_TESTING]        = "testing",
2723         [IF_OPER_DORMANT]        = "dormant",
2724         [IF_OPER_UP]             = "up",
2725 };
2726
2727 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);