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 "tuntap.h"
  68 #include "udev-util.h"
  69 #include "util.h"
  70 #include "vrf.h"
  71
  72 bool link_ipv6_enabled(Link *link) {
  73         assert(link);
  74
  75         if (!socket_ipv6_is_supported())
  76                 return false;
  77
  78         if (link->iftype == ARPHRD_CAN)
  79                 return false;
  80
  81         if (!link->network)
  82                 return false;
  83
  84         if (link->network->bond)
  85                 return false;
  86
  87         if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
  88                 return true;
  89
  90         if (network_has_static_ipv6_configurations(link->network))
  91                 return true;
  92
  93         return false;
  94 }
  95
  96 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
  97         assert(link);
  98
  99         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
 100                 return false;
 101
 102         if (!link->network)
 103                 return allow_unmanaged;
 104
 105         if (!link->network->configure_without_carrier) {
 106                 if (link->set_flags_messages > 0)
 107                         return false;
 108
 109                 if (!link_has_carrier(link))
 110                         return false;
 111         }
 112
 113         if (link->set_link_messages > 0)
 114                 return false;
 115
 116         if (!link->activated)
 117                 return false;
 118
 119         return true;
 120 }
 121
 122 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
 123         return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
 124 }
 125
 126 void link_ntp_settings_clear(Link *link) {
 127         link->ntp = strv_free(link->ntp);
 128 }
 129
 130 void link_dns_settings_clear(Link *link) {
 131         if (link->n_dns != UINT_MAX)
 132                 for (unsigned i = 0; i < link->n_dns; i++)
 133                         in_addr_full_free(link->dns[i]);
 134         link->dns = mfree(link->dns);
 135         link->n_dns = UINT_MAX;
 136
 137         link->search_domains = ordered_set_free(link->search_domains);
 138         link->route_domains = ordered_set_free(link->route_domains);
 139
 140         link->dns_default_route = -1;
 141         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 142         link->mdns = _RESOLVE_SUPPORT_INVALID;
 143         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 144         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 145
 146         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 147 }
 148
 149 static void link_free_engines(Link *link) {
 150         if (!link)
 151                 return;
 152
 153         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 154
 155         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 156         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 157         link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
 158
 159         link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
 160         link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
 161
 162         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 163
 164         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 165         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 166
 167         link->ndisc = sd_ndisc_unref(link->ndisc);
 168         link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
 169         ndisc_flush(link);
 170
 171         link->radv = sd_radv_unref(link->radv);
 172 }
 173
 174 static Link *link_free(Link *link) {
 175         assert(link);
 176
 177         link_ntp_settings_clear(link);
 178         link_dns_settings_clear(link);
 179
 180         link->routes = set_free(link->routes);
 181         link->nexthops = set_free(link->nexthops);
 182         link->neighbors = set_free(link->neighbors);
 183         link->addresses = set_free(link->addresses);
 184         link->qdiscs = set_free(link->qdiscs);
 185         link->tclasses = set_free(link->tclasses);
 186
 187         link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
 188
 189         link_free_engines(link);
 190
 191         set_free(link->sr_iov_virt_port_ifindices);
 192         free(link->ifname);
 193         strv_free(link->alternative_names);
 194         free(link->kind);
 195         free(link->ssid);
 196         free(link->previous_ssid);
 197         free(link->driver);
 198
 199         unlink_and_free(link->lease_file);
 200         unlink_and_free(link->lldp_file);
 201         unlink_and_free(link->state_file);
 202
 203         sd_device_unref(link->dev);
 204         netdev_unref(link->netdev);
 205
 206         hashmap_free(link->bound_to_links);
 207         hashmap_free(link->bound_by_links);
 208
 209         set_free_with_destructor(link->slaves, link_unref);
 210
 211         network_unref(link->network);
 212
 213         sd_event_source_disable_unref(link->carrier_lost_timer);
 214
 215         return mfree(link);
 216 }
 217
 218 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 219
 220 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
 221         Link *link;
 222
 223         assert(m);
 224         assert(ifindex > 0);
 225
 226         link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
 227         if (!link)
 228                 return -ENODEV;
 229
 230         if (ret)
 231                 *ret = link;
 232         return 0;
 233 }
 234
 235 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
 236         Link *link;
 237
 238         assert(m);
 239         assert(ifname);
 240
 241         link = hashmap_get(m->links_by_name, ifname);
 242         if (!link)
 243                 return -ENODEV;
 244
 245         if (ret)
 246                 *ret = link;
 247         return 0;
 248 }
 249
 250 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
 251         Link *link;
 252
 253         assert(m);
 254         assert(hw_addr);
 255
 256         link = hashmap_get(m->links_by_hw_addr, hw_addr);
 257         if (!link)
 258                 return -ENODEV;
 259
 260         if (ret)
 261                 *ret = link;
 262         return 0;
 263 }
 264
 265 int link_get_master(Link *link, Link **ret) {
 266         assert(link);
 267         assert(link->manager);
 268         assert(ret);
 269
 270         if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
 271                 return -ENODEV;
 272
 273         return link_get_by_index(link->manager, link->master_ifindex, ret);
 274 }
 275
 276 void link_set_state(Link *link, LinkState state) {
 277         assert(link);
 278
 279         if (link->state == state)
 280                 return;
 281
 282         log_link_debug(link, "State changed: %s -> %s",
 283                        link_state_to_string(link->state),
 284                        link_state_to_string(state));
 285
 286         link->state = state;
 287
 288         link_send_changed(link, "AdministrativeState", NULL);
 289         link_dirty(link);
 290 }
 291
 292 int link_stop_engines(Link *link, bool may_keep_dhcp) {
 293         int r = 0, k;
 294
 295         assert(link);
 296         assert(link->manager);
 297         assert(link->manager->event);
 298
 299         bool keep_dhcp = may_keep_dhcp &&
 300                          link->network &&
 301                          !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
 302                          (link->manager->restarting ||
 303                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 304
 305         if (!keep_dhcp) {
 306                 k = sd_dhcp_client_stop(link->dhcp_client);
 307                 if (k < 0)
 308                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 309         }
 310
 311         k = sd_dhcp_server_stop(link->dhcp_server);
 312         if (k < 0)
 313                 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
 314
 315         k = sd_lldp_rx_stop(link->lldp_rx);
 316         if (k < 0)
 317                 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
 318
 319         k = sd_lldp_tx_stop(link->lldp_tx);
 320         if (k < 0)
 321                 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
 322
 323         k = sd_ipv4ll_stop(link->ipv4ll);
 324         if (k < 0)
 325                 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 326
 327         k = ipv4acd_stop(link);
 328         if (k < 0)
 329                 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 330
 331         k = sd_dhcp6_client_stop(link->dhcp6_client);
 332         if (k < 0)
 333                 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 334
 335         k = dhcp_pd_remove(link, /* only_marked = */ false);
 336         if (k < 0)
 337                 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 338
 339         k = ndisc_stop(link);
 340         if (k < 0)
 341                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 342
 343         ndisc_flush(link);
 344
 345         k = sd_radv_stop(link->radv);
 346         if (k < 0)
 347                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 348
 349         return r;
 350 }
 351
 352 void link_enter_failed(Link *link) {
 353         assert(link);
 354
 355         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 356                 return;
 357
 358         log_link_warning(link, "Failed");
 359
 360         link_set_state(link, LINK_STATE_FAILED);
 361
 362         (void) link_stop_engines(link, false);
 363 }
 364
 365 void link_check_ready(Link *link) {
 366         Address *a;
 367
 368         assert(link);
 369
 370         if (link->state == LINK_STATE_CONFIGURED)
 371                 return;
 372
 373         if (link->state != LINK_STATE_CONFIGURING)
 374                 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
 375
 376         if (!link->network)
 377                 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
 378
 379         if (!link->tc_configured)
 380                 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
 381
 382         if (link->set_link_messages > 0)
 383                 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
 384
 385         if (!link->activated)
 386                 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
 387
 388         if (link->iftype == ARPHRD_CAN) {
 389                 /* let's shortcut things for CAN which doesn't need most of checks below. */
 390                 link_set_state(link, LINK_STATE_CONFIGURED);
 391                 return;
 392         }
 393
 394         if (!link->stacked_netdevs_created)
 395                 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
 396
 397         if (!link->static_addresses_configured)
 398                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 399
 400         SET_FOREACH(a, link->addresses)
 401                 if (!address_is_ready(a))
 402                         return (void) log_link_debug(link, "%s(): address %s is not ready.", __func__,
 403                                                      IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
 404
 405         if (!link->static_address_labels_configured)
 406                 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
 407
 408         if (!link->static_bridge_fdb_configured)
 409                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 410
 411         if (!link->static_bridge_mdb_configured)
 412                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 413
 414         if (!link->static_ipv6_proxy_ndp_configured)
 415                 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
 416
 417         if (!link->static_neighbors_configured)
 418                 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
 419
 420         if (!link->static_nexthops_configured)
 421                 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
 422
 423         if (!link->static_routes_configured)
 424                 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
 425
 426         if (!link->static_routing_policy_rules_configured)
 427                 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
 428
 429         if (!link->sr_iov_configured)
 430                 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
 431
 432         /* IPv6LL is assigned after the link gains its carrier. */
 433         if (!link->network->configure_without_carrier &&
 434             link_ipv6ll_enabled(link) &&
 435             !in6_addr_is_set(&link->ipv6ll_address))
 436                 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
 437
 438         bool has_dynamic_address = false;
 439         SET_FOREACH(a, link->addresses) {
 440                 if (address_is_marked(a))
 441                         continue;
 442                 if (!address_exists(a))
 443                         continue;
 444                 if (IN_SET(a->source,
 445                            NETWORK_CONFIG_SOURCE_IPV4LL,
 446                            NETWORK_CONFIG_SOURCE_DHCP4,
 447                            NETWORK_CONFIG_SOURCE_DHCP6,
 448                            NETWORK_CONFIG_SOURCE_DHCP_PD,
 449                            NETWORK_CONFIG_SOURCE_NDISC)) {
 450                         has_dynamic_address = true;
 451                         break;
 452                 }
 453         }
 454
 455         if ((link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) || link_dhcp6_with_address_enabled(link) ||
 456              (link_dhcp_pd_is_enabled(link) && link->network->dhcp_pd_assign)) && !has_dynamic_address)
 457                 /* When DHCP[46] or IPv4LL is enabled, at least one address is acquired by them. */
 458                 return (void) log_link_debug(link, "%s(): DHCPv4, DHCPv6, DHCP-PD or IPv4LL is enabled but no dynamic address is assigned yet.", __func__);
 459
 460         /* Ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
 461         if (link_ipv4ll_enabled(link) || link_dhcp4_enabled(link) ||
 462             link_dhcp6_enabled(link) || link_dhcp_pd_is_enabled(link) ||
 463             (!link->network->configure_without_carrier && link_ipv6_accept_ra_enabled(link))) {
 464
 465                 if (!link->ipv4ll_address_configured && !link->dhcp4_configured &&
 466                     !link->dhcp6_configured && !link->dhcp_pd_configured && !link->ndisc_configured)
 467                         /* When DHCP[46], NDisc, or IPv4LL is enabled, at least one protocol must be finished. */
 468                         return (void) log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
 469
 470                 log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
 471                                __func__,
 472                                yes_no(link->ipv4ll_address_configured),
 473                                yes_no(link->dhcp4_configured),
 474                                yes_no(link->dhcp6_configured),
 475                                yes_no(link->dhcp_pd_configured),
 476                                yes_no(link->ndisc_configured));
 477         }
 478
 479         link_set_state(link, LINK_STATE_CONFIGURED);
 480 }
 481
 482 static int link_request_static_configs(Link *link) {
 483         int r;
 484
 485         assert(link);
 486         assert(link->network);
 487         assert(link->state != _LINK_STATE_INVALID);
 488
 489         r = link_request_static_addresses(link);
 490         if (r < 0)
 491                 return r;
 492
 493         r = link_request_static_address_labels(link);
 494         if (r < 0)
 495                 return r;
 496
 497         r = link_request_static_bridge_fdb(link);
 498         if (r < 0)
 499                 return r;
 500
 501         r = link_request_static_bridge_mdb(link);
 502         if (r < 0)
 503                 return r;
 504
 505         r = link_request_static_ipv6_proxy_ndp_addresses(link);
 506         if (r < 0)
 507                 return r;
 508
 509         r = link_request_static_neighbors(link);
 510         if (r < 0)
 511                 return r;
 512
 513         r = link_request_static_nexthops(link, false);
 514         if (r < 0)
 515                 return r;
 516
 517         r = link_request_static_routes(link, false);
 518         if (r < 0)
 519                 return r;
 520
 521         r = link_request_static_routing_policy_rules(link);
 522         if (r < 0)
 523                 return r;
 524
 525         return 0;
 526 }
 527
 528 static int link_request_stacked_netdevs(Link *link) {
 529         NetDev *netdev;
 530         int r;
 531
 532         assert(link);
 533
 534         link->stacked_netdevs_created = false;
 535
 536         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 537                 r = link_request_stacked_netdev(link, netdev);
 538                 if (r < 0)
 539                         return r;
 540         }
 541
 542         if (link->create_stacked_netdev_messages == 0) {
 543                 link->stacked_netdevs_created = true;
 544                 link_check_ready(link);
 545         }
 546
 547         return 0;
 548 }
 549
 550 static int link_acquire_dynamic_ipv6_conf(Link *link) {
 551         int r;
 552
 553         assert(link);
 554
 555         r = radv_start(link);
 556         if (r < 0)
 557                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 558
 559         r = ndisc_start(link);
 560         if (r < 0)
 561                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 562
 563         r = dhcp6_start(link);
 564         if (r < 0)
 565                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 566
 567         return 0;
 568 }
 569
 570 static int link_acquire_dynamic_ipv4_conf(Link *link) {
 571         int r;
 572
 573         assert(link);
 574         assert(link->manager);
 575         assert(link->manager->event);
 576
 577         if (link->dhcp_client) {
 578                 r = dhcp4_start(link);
 579                 if (r < 0)
 580                         return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
 581
 582                 log_link_debug(link, "Acquiring DHCPv4 lease.");
 583
 584         } else if (link->ipv4ll) {
 585                 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
 586                         r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
 587                         if (r < 0)
 588                                 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
 589                 }
 590
 591                 r = sd_ipv4ll_start(link->ipv4ll);
 592                 if (r < 0)
 593                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
 594
 595                 log_link_debug(link, "Acquiring IPv4 link-local address.");
 596         }
 597
 598         if (link->dhcp_server) {
 599                 r = sd_dhcp_server_start(link->dhcp_server);
 600                 if (r < 0)
 601                         return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
 602         }
 603
 604         r = ipv4acd_start(link);
 605         if (r < 0)
 606                 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
 607
 608         return 0;
 609 }
 610
 611 static int link_acquire_dynamic_conf(Link *link) {
 612         int r;
 613
 614         assert(link);
 615         assert(link->network);
 616
 617         r = link_acquire_dynamic_ipv4_conf(link);
 618         if (r < 0)
 619                 return r;
 620
 621         if (in6_addr_is_set(&link->ipv6ll_address)) {
 622                 r = link_acquire_dynamic_ipv6_conf(link);
 623                 if (r < 0)
 624                         return r;
 625         }
 626
 627         if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
 628                 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
 629                  * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
 630                  * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
 631                  * below will be called in radv_start(). */
 632                 r = dhcp_request_prefix_delegation(link);
 633                 if (r < 0)
 634                         return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 635         }
 636
 637         if (link->lldp_tx) {
 638                 r = sd_lldp_tx_start(link->lldp_tx);
 639                 if (r < 0)
 640                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
 641         }
 642
 643         if (link->lldp_rx) {
 644                 r = sd_lldp_rx_start(link->lldp_rx);
 645                 if (r < 0)
 646                         return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
 647         }
 648
 649         return 0;
 650 }
 651
 652 int link_ipv6ll_gained(Link *link) {
 653         int r;
 654
 655         assert(link);
 656
 657         log_link_info(link, "Gained IPv6LL");
 658
 659         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 660                 return 0;
 661
 662         r = link_acquire_dynamic_ipv6_conf(link);
 663         if (r < 0)
 664                 return r;
 665
 666         link_check_ready(link);
 667         return 0;
 668 }
 669
 670 int link_handle_bound_to_list(Link *link) {
 671         bool required_up = false;
 672         bool link_is_up = false;
 673         Link *l;
 674
 675         assert(link);
 676
 677         /* If at least one interface in bound_to_links has carrier, then make this interface up.
 678          * If all interfaces in bound_to_links do not, then make this interface down. */
 679
 680         if (hashmap_isempty(link->bound_to_links))
 681                 return 0;
 682
 683         if (link->flags & IFF_UP)
 684                 link_is_up = true;
 685
 686         HASHMAP_FOREACH(l, link->bound_to_links)
 687                 if (link_has_carrier(l)) {
 688                         required_up = true;
 689                         break;
 690                 }
 691
 692         if (!required_up && link_is_up)
 693                 return link_request_to_bring_up_or_down(link, /* up = */ false);
 694         if (required_up && !link_is_up)
 695                 return link_request_to_bring_up_or_down(link, /* up = */ true);
 696
 697         return 0;
 698 }
 699
 700 static int link_handle_bound_by_list(Link *link) {
 701         Link *l;
 702         int r;
 703
 704         assert(link);
 705
 706         /* Update up or down state of interfaces which depend on this interface's carrier state. */
 707
 708         if (hashmap_isempty(link->bound_by_links))
 709                 return 0;
 710
 711         HASHMAP_FOREACH(l, link->bound_by_links) {
 712                 r = link_handle_bound_to_list(l);
 713                 if (r < 0)
 714                         return r;
 715         }
 716
 717         return 0;
 718 }
 719
 720 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
 721         int r;
 722
 723         assert(link);
 724         assert(carrier);
 725
 726         if (link == carrier)
 727                 return 0;
 728
 729         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
 730                 return 0;
 731
 732         r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
 733         if (r < 0)
 734                 return r;
 735
 736         link_dirty(link);
 737
 738         return 0;
 739 }
 740
 741 static int link_new_bound_by_list(Link *link) {
 742         Manager *m;
 743         Link *carrier;
 744         int r;
 745
 746         assert(link);
 747         assert(link->manager);
 748
 749         m = link->manager;
 750
 751         HASHMAP_FOREACH(carrier, m->links_by_index) {
 752                 if (!carrier->network)
 753                         continue;
 754
 755                 if (strv_isempty(carrier->network->bind_carrier))
 756                         continue;
 757
 758                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
 759                         r = link_put_carrier(link, carrier, &link->bound_by_links);
 760                         if (r < 0)
 761                                 return r;
 762                 }
 763         }
 764
 765         HASHMAP_FOREACH(carrier, link->bound_by_links) {
 766                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
 767                 if (r < 0)
 768                         return r;
 769         }
 770
 771         return 0;
 772 }
 773
 774 static int link_new_bound_to_list(Link *link) {
 775         Manager *m;
 776         Link *carrier;
 777         int r;
 778
 779         assert(link);
 780         assert(link->manager);
 781
 782         if (!link->network)
 783                 return 0;
 784
 785         if (strv_isempty(link->network->bind_carrier))
 786                 return 0;
 787
 788         m = link->manager;
 789
 790         HASHMAP_FOREACH(carrier, m->links_by_index) {
 791                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
 792                         r = link_put_carrier(link, carrier, &link->bound_to_links);
 793                         if (r < 0)
 794                                 return r;
 795                 }
 796         }
 797
 798         HASHMAP_FOREACH(carrier, link->bound_to_links) {
 799                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
 800                 if (r < 0)
 801                         return r;
 802         }
 803
 804         return 0;
 805 }
 806
 807 static void link_free_bound_to_list(Link *link) {
 808         bool updated = false;
 809         Link *bound_to;
 810
 811         assert(link);
 812
 813         while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
 814                 updated = true;
 815
 816                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
 817                         link_dirty(bound_to);
 818         }
 819
 820         if (updated)
 821                 link_dirty(link);
 822 }
 823
 824 static void link_free_bound_by_list(Link *link) {
 825         bool updated = false;
 826         Link *bound_by;
 827
 828         assert(link);
 829
 830         while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
 831                 updated = true;
 832
 833                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
 834                         link_dirty(bound_by);
 835                         link_handle_bound_to_list(bound_by);
 836                 }
 837         }
 838
 839         if (updated)
 840                 link_dirty(link);
 841 }
 842
 843 static int link_append_to_master(Link *link) {
 844         Link *master;
 845         int r;
 846
 847         assert(link);
 848
 849         /* - The link may have no master.
 850          * - RTM_NEWLINK message about master interface may not be received yet. */
 851         if (link_get_master(link, &master) < 0)
 852                 return 0;
 853
 854         r = set_ensure_put(&master->slaves, NULL, link);
 855         if (r <= 0)
 856                 return r;
 857
 858         link_ref(link);
 859         return 0;
 860 }
 861
 862 static void link_drop_from_master(Link *link) {
 863         Link *master;
 864
 865         assert(link);
 866
 867         if (!link->manager)
 868                 return;
 869
 870         if (link_get_master(link, &master) < 0)
 871                 return;
 872
 873         link_unref(set_remove(master->slaves, link));
 874 }
 875
 876 static void link_drop_requests(Link *link) {
 877         Request *req;
 878
 879         assert(link);
 880         assert(link->manager);
 881
 882         ORDERED_SET_FOREACH(req, link->manager->request_queue)
 883                 if (req->link == link)
 884                         request_detach(link->manager, req);
 885 }
 886
 887 static Link *link_drop(Link *link) {
 888         if (!link)
 889                 return NULL;
 890
 891         assert(link->manager);
 892
 893         link_set_state(link, LINK_STATE_LINGER);
 894
 895         /* Drop all references from other links and manager. Note that async netlink calls may have
 896          * references to the link, and they will be dropped when we receive replies. */
 897
 898         link_drop_requests(link);
 899
 900         link_free_bound_to_list(link);
 901         link_free_bound_by_list(link);
 902
 903         link_clear_sr_iov_ifindices(link);
 904
 905         link_drop_from_master(link);
 906
 907         if (link->state_file)
 908                 (void) unlink(link->state_file);
 909
 910         link_clean(link);
 911
 912         STRV_FOREACH(n, link->alternative_names)
 913                 hashmap_remove(link->manager->links_by_name, *n);
 914         hashmap_remove(link->manager->links_by_name, link->ifname);
 915
 916         /* bonding master and its slaves have the same hardware address. */
 917         hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
 918
 919         /* The following must be called at last. */
 920         assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
 921         return link_unref(link);
 922 }
 923
 924 static int link_drop_foreign_config(Link *link) {
 925         int k, r;
 926
 927         assert(link);
 928         assert(link->manager);
 929
 930         /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
 931          * to remove loopback address or addresses used for root NFS. */
 932
 933         if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
 934                 return 0;
 935         if (FLAGS_SET(link->flags, IFF_LOOPBACK))
 936                 return 0;
 937         if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
 938                 return 0;
 939
 940         r = link_drop_foreign_routes(link);
 941
 942         k = link_drop_foreign_nexthops(link);
 943         if (k < 0 && r >= 0)
 944                 r = k;
 945
 946         k = link_drop_foreign_addresses(link);
 947         if (k < 0 && r >= 0)
 948                 r = k;
 949
 950         k = link_drop_foreign_neighbors(link);
 951         if (k < 0 && r >= 0)
 952                 r = k;
 953
 954         k = manager_drop_foreign_routing_policy_rules(link->manager);
 955         if (k < 0 && r >= 0)
 956                 r = k;
 957
 958         return r;
 959 }
 960
 961 static int link_drop_managed_config(Link *link) {
 962         int k, r;
 963
 964         assert(link);
 965         assert(link->manager);
 966
 967         r = link_drop_managed_routes(link);
 968
 969         k = link_drop_managed_nexthops(link);
 970         if (k < 0 && r >= 0)
 971                 r = k;
 972
 973         k = link_drop_managed_addresses(link);
 974         if (k < 0 && r >= 0)
 975                 r = k;
 976
 977         k = link_drop_managed_neighbors(link);
 978         if (k < 0 && r >= 0)
 979                 r = k;
 980
 981         k = link_drop_managed_routing_policy_rules(link);
 982         if (k < 0 && r >= 0)
 983                 r = k;
 984
 985         return r;
 986 }
 987
 988 static void link_foreignize_config(Link *link) {
 989         assert(link);
 990         assert(link->manager);
 991
 992         link_foreignize_routes(link);
 993         link_foreignize_nexthops(link);
 994         link_foreignize_addresses(link);
 995         link_foreignize_neighbors(link);
 996         link_foreignize_routing_policy_rules(link);
 997 }
 998
 999 static int link_configure(Link *link) {
1000         int r;
1001
1002         assert(link);
1003         assert(link->network);
1004         assert(link->state == LINK_STATE_INITIALIZED);
1005
1006         link_set_state(link, LINK_STATE_CONFIGURING);
1007
1008         r = link_new_bound_to_list(link);
1009         if (r < 0)
1010                 return r;
1011
1012         r = link_request_traffic_control(link);
1013         if (r < 0)
1014                 return r;
1015
1016         if (link->iftype == ARPHRD_CAN) {
1017                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1018                 r = link_request_to_set_can(link);
1019                 if (r < 0)
1020                         return r;
1021
1022                 return link_request_to_activate(link);
1023         }
1024
1025         r = link_request_sr_iov_vfs(link);
1026         if (r < 0)
1027                 return r;
1028
1029         r = link_set_sysctl(link);
1030         if (r < 0)
1031                 return r;
1032
1033         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1034         if (r < 0)
1035                 return r;
1036
1037         r = link_request_to_set_ipoib(link);
1038         if (r < 0)
1039                 return r;
1040
1041         r = link_request_to_set_flags(link);
1042         if (r < 0)
1043                 return r;
1044
1045         r = link_request_to_set_group(link);
1046         if (r < 0)
1047                 return r;
1048
1049         r = link_configure_mtu(link);
1050         if (r < 0)
1051                 return r;
1052
1053         r = link_request_to_set_addrgen_mode(link);
1054         if (r < 0)
1055                 return r;
1056
1057         r = link_request_to_set_master(link);
1058         if (r < 0)
1059                 return r;
1060
1061         r = link_request_stacked_netdevs(link);
1062         if (r < 0)
1063                 return r;
1064
1065         r = link_request_to_set_bond(link);
1066         if (r < 0)
1067                 return r;
1068
1069         r = link_request_to_set_bridge(link);
1070         if (r < 0)
1071                 return r;
1072
1073         r = link_request_to_set_bridge_vlan(link);
1074         if (r < 0)
1075                 return r;
1076
1077         r = link_request_to_activate(link);
1078         if (r < 0)
1079                 return r;
1080
1081         r = ipv4ll_configure(link);
1082         if (r < 0)
1083                 return r;
1084
1085         r = link_request_dhcp4_client(link);
1086         if (r < 0)
1087                 return r;
1088
1089         r = link_request_dhcp6_client(link);
1090         if (r < 0)
1091                 return r;
1092
1093         r = link_request_ndisc(link);
1094         if (r < 0)
1095                 return r;
1096
1097         r = link_request_dhcp_server(link);
1098         if (r < 0)
1099                 return r;
1100
1101         r = link_request_radv(link);
1102         if (r < 0)
1103                 return r;
1104
1105         r = link_lldp_rx_configure(link);
1106         if (r < 0)
1107                 return r;
1108
1109         r = link_lldp_tx_configure(link);
1110         if (r < 0)
1111                 return r;
1112
1113         r = link_drop_foreign_config(link);
1114         if (r < 0)
1115                 return r;
1116
1117         r = link_request_static_configs(link);
1118         if (r < 0)
1119                 return r;
1120
1121         if (!link_has_carrier(link))
1122                 return 0;
1123
1124         return link_acquire_dynamic_conf(link);
1125 }
1126
1127 static int link_get_network(Link *link, Network **ret) {
1128         Network *network;
1129         int r;
1130
1131         assert(link);
1132         assert(link->manager);
1133         assert(ret);
1134
1135         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1136                 bool warn = false;
1137
1138                 r = net_match_config(
1139                                 &network->match,
1140                                 link->dev,
1141                                 &link->hw_addr,
1142                                 &link->permanent_hw_addr,
1143                                 link->driver,
1144                                 link->iftype,
1145                                 link->kind,
1146                                 link->ifname,
1147                                 link->alternative_names,
1148                                 link->wlan_iftype,
1149                                 link->ssid,
1150                                 &link->bssid);
1151                 if (r < 0)
1152                         return r;
1153                 if (r == 0)
1154                         continue;
1155
1156                 if (network->match.ifname && link->dev) {
1157                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1158                         const char *attr;
1159
1160                         if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1161                                 (void) safe_atou8(attr, &name_assign_type);
1162
1163                         warn = name_assign_type == NET_NAME_ENUM;
1164                 }
1165
1166                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1167                               "found matching network '%s'%s.",
1168                               network->filename,
1169                               warn ? ", based on potentially unpredictable interface name" : "");
1170
1171                 if (network->unmanaged)
1172                         return -ENOENT;
1173
1174                 *ret = network;
1175                 return 0;
1176         }
1177
1178         return -ENOENT;
1179 }
1180
1181 static int link_reconfigure_impl(Link *link, bool force) {
1182         Network *network = NULL;
1183         NetDev *netdev = NULL;
1184         int r;
1185
1186         assert(link);
1187
1188         if (!IN_SET(link->state, LINK_STATE_INITIALIZED, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
1189                 return 0;
1190
1191         r = netdev_get(link->manager, link->ifname, &netdev);
1192         if (r < 0 && r != -ENOENT)
1193                 return r;
1194
1195         r = link_get_network(link, &network);
1196         if (r < 0 && r != -ENOENT)
1197                 return r;
1198
1199         if (link->state != LINK_STATE_UNMANAGED && !network)
1200                 /* If link is in initialized state, then link->network is also NULL. */
1201                 force = true;
1202
1203         if (link->network == network && !force)
1204                 return 0;
1205
1206         if (network) {
1207                 if (link->state == LINK_STATE_INITIALIZED)
1208                         log_link_info(link, "Configuring with %s.", network->filename);
1209                 else
1210                         log_link_info(link, "Reconfiguring with %s.", network->filename);
1211         } else
1212                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1213                               "Unmanaging interface.");
1214
1215         /* Dropping old .network file */
1216         r = link_stop_engines(link, false);
1217         if (r < 0)
1218                 return r;
1219
1220         link_drop_requests(link);
1221
1222         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1223                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1224                  * routes, and so on) foreign, and then drop unnecessary configs later by
1225                  * link_drop_foreign_config() in link_configure().
1226                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1227                  * here we need to drop the configs such as addresses, routes, and so on configured by
1228                  * the previously assigned .network file. */
1229                 link_foreignize_config(link);
1230         else {
1231                 /* Remove all managed configs. Note, foreign configs are removed in later by
1232                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1233                 r = link_drop_managed_config(link);
1234                 if (r < 0)
1235                         return r;
1236         }
1237
1238         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1239          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1240          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1241          * map here, as it depends on .network files assigned to other links. */
1242         link_free_bound_to_list(link);
1243
1244         link_free_engines(link);
1245         link->network = network_unref(link->network);
1246
1247         netdev_unref(link->netdev);
1248         link->netdev = netdev_ref(netdev);
1249
1250         if (!network) {
1251                 link_set_state(link, LINK_STATE_UNMANAGED);
1252                 return 0;
1253         }
1254
1255         /* Then, apply new .network file */
1256         link->network = network_ref(network);
1257         link_update_operstate(link, true);
1258         link_dirty(link);
1259
1260         link_set_state(link, LINK_STATE_INITIALIZED);
1261         link->activated = false;
1262
1263         r = link_configure(link);
1264         if (r < 0)
1265                 return r;
1266
1267         return 1;
1268 }
1269
1270 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1271         int r;
1272
1273         assert(link);
1274
1275         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1276         if (r <= 0)
1277                 return r;
1278
1279         r = link_reconfigure_impl(link, force);
1280         if (r < 0) {
1281                 link_enter_failed(link);
1282                 return 0;
1283         }
1284
1285         return r;
1286 }
1287
1288 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1289         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1290 }
1291
1292 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1293         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1294 }
1295
1296 static int link_reconfigure_after_sleep_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1297         int r;
1298
1299         assert(link);
1300
1301         r = link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1302         if (r != 0)
1303                 return r;
1304
1305         /* r == 0 means an error occurs, the link is unmanaged, or the matching network file is unchanged. */
1306         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
1307                 return 0;
1308
1309         /* re-request static configs, and restart engines. */
1310         r = link_stop_engines(link, false);
1311         if (r < 0) {
1312                 link_enter_failed(link);
1313                 return 0;
1314         }
1315
1316         r = link_acquire_dynamic_conf(link);
1317         if (r < 0) {
1318                 link_enter_failed(link);
1319                 return 0;
1320         }
1321
1322         r = link_request_static_configs(link);
1323         if (r < 0) {
1324                 link_enter_failed(link);
1325                 return 0;
1326         }
1327
1328         return 0;
1329 }
1330
1331 static int link_reconfigure_internal(Link *link, link_netlink_message_handler_t callback) {
1332         int r;
1333
1334         assert(link);
1335         assert(callback);
1336
1337         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1338          * the function from being called multiple times simultaneously, refuse to reconfigure the
1339          * interface in these cases. */
1340         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1341                 return 0; /* 0 means no-op. */
1342
1343         r = link_call_getlink(link, callback);
1344         if (r < 0)
1345                 return r;
1346
1347         return 1; /* 1 means the interface will be reconfigured. */
1348 }
1349
1350 int link_reconfigure(Link *link, bool force) {
1351         return link_reconfigure_internal(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1352 }
1353
1354 int link_reconfigure_after_sleep(Link *link) {
1355         return link_reconfigure_internal(link, link_reconfigure_after_sleep_handler);
1356 }
1357
1358 static int link_initialized_and_synced(Link *link) {
1359         int r;
1360
1361         assert(link);
1362         assert(link->manager);
1363
1364         if (link->manager->test_mode) {
1365                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1366                 link_set_state(link, LINK_STATE_UNMANAGED);
1367                 return 0;
1368         }
1369
1370         /* This may get called either from the asynchronous netlink callback,
1371          * or directly from link_check_initialized() if running in a container. */
1372         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1373                 return 0;
1374
1375         log_link_debug(link, "Link state is up-to-date");
1376         link_set_state(link, LINK_STATE_INITIALIZED);
1377
1378         r = link_new_bound_by_list(link);
1379         if (r < 0)
1380                 return r;
1381
1382         r = link_handle_bound_by_list(link);
1383         if (r < 0)
1384                 return r;
1385
1386         return link_reconfigure_impl(link, /* force = */ false);
1387 }
1388
1389 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1390         int r;
1391
1392         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1393         if (r <= 0)
1394                 return r;
1395
1396         r = link_initialized_and_synced(link);
1397         if (r < 0)
1398                 link_enter_failed(link);
1399
1400         return 0;
1401 }
1402
1403 static int link_initialized(Link *link, sd_device *device) {
1404         int r;
1405
1406         assert(link);
1407         assert(device);
1408
1409         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1410          * or sysattrs) may be outdated. */
1411         device_unref_and_replace(link->dev, device);
1412
1413         r = link_set_sr_iov_ifindices(link);
1414         if (r < 0)
1415                 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1416
1417         /* Do not ignore unamanaged state case here. If an interface is renamed after being once
1418          * configured, and the corresponding .network file has Name= in [Match] section, then the
1419          * interface may be already in unmanaged state. See #20657. */
1420         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_UNMANAGED))
1421                 return 0;
1422
1423         log_link_debug(link, "udev initialized link");
1424         link_set_state(link, LINK_STATE_INITIALIZED);
1425
1426         /* udev has initialized the link, but we don't know if we have yet
1427          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1428          * when it returns we know that the pending NEWLINKs have already been
1429          * processed and that we are up-to-date */
1430
1431         return link_call_getlink(link, link_initialized_handler);
1432 }
1433
1434 static int link_check_initialized(Link *link) {
1435         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1436         int r;
1437
1438         assert(link);
1439
1440         if (!udev_available())
1441                 return link_initialized_and_synced(link);
1442
1443         /* udev should be around */
1444         r = sd_device_new_from_ifindex(&device, link->ifindex);
1445         if (r < 0) {
1446                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1447                 return 0;
1448         }
1449
1450         r = sd_device_get_is_initialized(device);
1451         if (r < 0)
1452                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1453         if (r == 0) {
1454                 /* not yet ready */
1455                 log_link_debug(link, "link pending udev initialization...");
1456                 return 0;
1457         }
1458
1459         r = device_is_renaming(device);
1460         if (r < 0)
1461                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1462         if (r > 0) {
1463                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1464                 return 0;
1465         }
1466
1467         return link_initialized(link, device);
1468 }
1469
1470 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1471         int r, ifindex;
1472         Link *link;
1473
1474         assert(m);
1475         assert(device);
1476
1477         r = sd_device_get_ifindex(device, &ifindex);
1478         if (r < 0)
1479                 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1480
1481         r = link_get_by_index(m, ifindex, &link);
1482         if (r < 0) {
1483                 /* This error is not critical, as the corresponding rtnl message may be received later. */
1484                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1485                 return 0;
1486         }
1487
1488         /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1489          * object here. It will be removed only when rtnetlink says so. */
1490         if (action == SD_DEVICE_REMOVE) {
1491                 link->dev = sd_device_unref(link->dev);
1492                 return 0;
1493         }
1494
1495         r = device_is_renaming(device);
1496         if (r < 0)
1497                 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1498         if (r > 0) {
1499                 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1500                 /* TODO:
1501                  * What happens when a device is initialized, then soon renamed after that? When we detect
1502                  * such, maybe we should cancel or postpone all queued requests for the interface. */
1503                 return 0;
1504         }
1505
1506         r = link_initialized(link, device);
1507         if (r < 0)
1508                 link_enter_failed(link);
1509
1510         return 0;
1511 }
1512
1513 static int link_carrier_gained(Link *link) {
1514         bool force_reconfigure;
1515         int r;
1516
1517         assert(link);
1518
1519         r = event_source_disable(link->carrier_lost_timer);
1520         if (r < 0)
1521                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1522
1523         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1524          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1525          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1526          * restarted, and the correct network information will be gained.
1527          *
1528          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1529          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1530          * already assigned to the interface (in that case, the .network file does not have the SSID=
1531          * setting in the [Match] section), and the interface is already being configured. Of course,
1532          * there may exist another .network file with higher priority and a matching SSID= setting. But
1533          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1534          *
1535          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1536          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1537         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1538         link->previous_ssid = mfree(link->previous_ssid);
1539
1540         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1541                 /* At this stage, both wlan and link information should be up-to-date. Hence,
1542                  * it is not necessary to call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or
1543                  * NL80211_CMD_GET_STATION commands, and simply call link_reconfigure_impl().
1544                  * Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1545                 r = link_reconfigure_impl(link, force_reconfigure);
1546                 if (r != 0)
1547                         return r;
1548         }
1549
1550         r = link_handle_bound_by_list(link);
1551         if (r < 0)
1552                 return r;
1553
1554         if (link->iftype == ARPHRD_CAN)
1555                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1556                 return 0;
1557
1558         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1559                 r = link_acquire_dynamic_conf(link);
1560                 if (r < 0)
1561                         return r;
1562
1563                 r = link_request_static_configs(link);
1564                 if (r < 0)
1565                         return r;
1566         }
1567
1568         return 0;
1569 }
1570
1571 static int link_carrier_lost_impl(Link *link) {
1572         int r, ret = 0;
1573
1574         assert(link);
1575
1576         link->previous_ssid = mfree(link->previous_ssid);
1577
1578         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1579                 return 0;
1580
1581         if (!link->network)
1582                 return 0;
1583
1584         r = link_stop_engines(link, false);
1585         if (r < 0)
1586                 ret = r;
1587
1588         r = link_drop_managed_config(link);
1589         if (r < 0 && ret >= 0)
1590                 ret = r;
1591
1592         return ret;
1593 }
1594
1595 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1596         Link *link = ASSERT_PTR(userdata);
1597         int r;
1598
1599         r = link_carrier_lost_impl(link);
1600         if (r < 0) {
1601                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1602                 link_enter_failed(link);
1603         }
1604
1605         return 0;
1606 }
1607
1608 static int link_carrier_lost(Link *link) {
1609         uint16_t dhcp_mtu;
1610         usec_t usec;
1611         int r;
1612
1613         assert(link);
1614
1615         r = link_handle_bound_by_list(link);
1616         if (r < 0)
1617                 return r;
1618
1619         if (link->iftype == ARPHRD_CAN)
1620                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1621                 return 0;
1622
1623         if (!link->network)
1624                 return 0;
1625
1626         if (link->network->ignore_carrier_loss_set)
1627                 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1628                 usec = link->network->ignore_carrier_loss_usec;
1629
1630         else if (link->network->bond && link->wlan_iftype > 0)
1631                 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1632                  * carrier to be lost. See #19832. */
1633                 usec = 3 * USEC_PER_SEC;
1634
1635         else if (link->network->dhcp_use_mtu &&
1636                  link->dhcp_lease &&
1637                  sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1638                  dhcp_mtu != link->original_mtu)
1639                 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1640                  * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1641                  * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1642                 usec = 5 * USEC_PER_SEC;
1643
1644         else
1645                 /* Otherwise, use the currently set value. */
1646                 usec = link->network->ignore_carrier_loss_usec;
1647
1648         if (usec == USEC_INFINITY)
1649                 return 0;
1650
1651         if (usec == 0)
1652                 return link_carrier_lost_impl(link);
1653
1654         return event_reset_time_relative(link->manager->event,
1655                                          &link->carrier_lost_timer,
1656                                          CLOCK_BOOTTIME,
1657                                          usec,
1658                                          0,
1659                                          link_carrier_lost_handler,
1660                                          link,
1661                                          0,
1662                                          "link-carrier-loss",
1663                                          true);
1664 }
1665
1666 static int link_admin_state_up(Link *link) {
1667         int r;
1668
1669         assert(link);
1670
1671         /* This is called every time an interface admin state changes to up;
1672          * specifically, when IFF_UP flag changes from unset to set. */
1673
1674         if (!link->network)
1675                 return 0;
1676
1677         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1678                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1679                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1680         }
1681
1682         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1683          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1684         r = link_set_ipv6_mtu(link);
1685         if (r < 0)
1686                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1687
1688         return 0;
1689 }
1690
1691 static int link_admin_state_down(Link *link) {
1692         assert(link);
1693
1694         if (!link->network)
1695                 return 0;
1696
1697         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1698                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1699                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1700         }
1701
1702         return 0;
1703 }
1704
1705 static bool link_is_enslaved(Link *link) {
1706         if (link->flags & IFF_SLAVE)
1707                 return true;
1708
1709         if (link->master_ifindex > 0)
1710                 return true;
1711
1712         return false;
1713 }
1714
1715 static LinkAddressState address_state_from_scope(uint8_t scope) {
1716         if (scope < RT_SCOPE_SITE)
1717                 /* universally accessible addresses found */
1718                 return LINK_ADDRESS_STATE_ROUTABLE;
1719
1720         if (scope < RT_SCOPE_HOST)
1721                 /* only link or site local addresses found */
1722                 return LINK_ADDRESS_STATE_DEGRADED;
1723
1724         /* no useful addresses found */
1725         return LINK_ADDRESS_STATE_OFF;
1726 }
1727
1728 void link_update_operstate(Link *link, bool also_update_master) {
1729         LinkOperationalState operstate;
1730         LinkCarrierState carrier_state;
1731         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1732         LinkOnlineState online_state;
1733         _cleanup_strv_free_ char **p = NULL;
1734         uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1735         bool changed = false;
1736         Address *address;
1737
1738         assert(link);
1739
1740         if (link->kernel_operstate == IF_OPER_DORMANT)
1741                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1742         else if (link_has_carrier(link)) {
1743                 if (link_is_enslaved(link))
1744                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1745                 else
1746                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1747         } else if (link->flags & IFF_UP)
1748                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1749         else
1750                 carrier_state = LINK_CARRIER_STATE_OFF;
1751
1752         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1753                 Link *slave;
1754
1755                 SET_FOREACH(slave, link->slaves) {
1756                         link_update_operstate(slave, false);
1757
1758                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1759                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1760                 }
1761         }
1762
1763         SET_FOREACH(address, link->addresses) {
1764                 if (!address_is_ready(address))
1765                         continue;
1766
1767                 if (address->family == AF_INET)
1768                         ipv4_scope = MIN(ipv4_scope, address->scope);
1769
1770                 if (address->family == AF_INET6)
1771                         ipv6_scope = MIN(ipv6_scope, address->scope);
1772         }
1773
1774         ipv4_address_state = address_state_from_scope(ipv4_scope);
1775         ipv6_address_state = address_state_from_scope(ipv6_scope);
1776         address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1777
1778         /* Mapping of address and carrier state vs operational state
1779          *                                                     carrier state
1780          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1781          *                 ------------------------------------------------------------------------------
1782          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1783          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
1784          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
1785          */
1786
1787         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1788                 operstate = (LinkOperationalState) carrier_state;
1789         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1790                 operstate = LINK_OPERSTATE_ROUTABLE;
1791         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1792                 operstate = LINK_OPERSTATE_DEGRADED;
1793         else
1794                 operstate = LINK_OPERSTATE_ENSLAVED;
1795
1796         /* Only determine online state for managed links with RequiredForOnline=yes */
1797         if (!link->network || !link->network->required_for_online)
1798                 online_state = _LINK_ONLINE_STATE_INVALID;
1799         else if (operstate < link->network->required_operstate_for_online.min ||
1800                  operstate > link->network->required_operstate_for_online.max)
1801                 online_state = LINK_ONLINE_STATE_OFFLINE;
1802         else {
1803                 AddressFamily required_family = link->network->required_family_for_online;
1804                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1805                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1806
1807                 /* The operational state is within the range required for online.
1808                  * If a particular address family is also required, we might revert
1809                  * to offline in the blocks below. */
1810                 online_state = LINK_ONLINE_STATE_ONLINE;
1811
1812                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1813                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1814                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1815                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1816                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1817                 }
1818
1819                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1820                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1821                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1822                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1823                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1824                 }
1825         }
1826
1827         if (link->carrier_state != carrier_state) {
1828                 link->carrier_state = carrier_state;
1829                 changed = true;
1830                 if (strv_extend(&p, "CarrierState") < 0)
1831                         log_oom();
1832         }
1833
1834         if (link->address_state != address_state) {
1835                 link->address_state = address_state;
1836                 changed = true;
1837                 if (strv_extend(&p, "AddressState") < 0)
1838                         log_oom();
1839         }
1840
1841         if (link->ipv4_address_state != ipv4_address_state) {
1842                 link->ipv4_address_state = ipv4_address_state;
1843                 changed = true;
1844                 if (strv_extend(&p, "IPv4AddressState") < 0)
1845                         log_oom();
1846         }
1847
1848         if (link->ipv6_address_state != ipv6_address_state) {
1849                 link->ipv6_address_state = ipv6_address_state;
1850                 changed = true;
1851                 if (strv_extend(&p, "IPv6AddressState") < 0)
1852                         log_oom();
1853         }
1854
1855         if (link->operstate != operstate) {
1856                 link->operstate = operstate;
1857                 changed = true;
1858                 if (strv_extend(&p, "OperationalState") < 0)
1859                         log_oom();
1860         }
1861
1862         if (link->online_state != online_state) {
1863                 link->online_state = online_state;
1864                 changed = true;
1865                 if (strv_extend(&p, "OnlineState") < 0)
1866                         log_oom();
1867         }
1868
1869         if (p)
1870                 link_send_changed_strv(link, p);
1871         if (changed)
1872                 link_dirty(link);
1873
1874         if (also_update_master) {
1875                 Link *master;
1876
1877                 if (link_get_master(link, &master) >= 0)
1878                         link_update_operstate(master, true);
1879         }
1880 }
1881
1882 #define FLAG_STRING(string, flag, old, new)                      \
1883         (((old ^ new) & flag)                                    \
1884          ? ((old & flag) ? (" -" string) : (" +" string))        \
1885          : "")
1886
1887 static int link_update_flags(Link *link, sd_netlink_message *message) {
1888         bool link_was_admin_up, had_carrier;
1889         uint8_t operstate;
1890         unsigned flags;
1891         int r;
1892
1893         assert(link);
1894         assert(message);
1895
1896         r = sd_rtnl_message_link_get_flags(message, &flags);
1897         if (r < 0)
1898                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1899
1900         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1901         if (r == -ENODATA)
1902                 /* If we got a message without operstate, assume the state was unchanged. */
1903                 operstate = link->kernel_operstate;
1904         else if (r < 0)
1905                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1906
1907         if (link->flags == flags && link->kernel_operstate == operstate)
1908                 return 0;
1909
1910         if (link->flags != flags) {
1911                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1912
1913                 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",
1914                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1915                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1916                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1917                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
1918                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1919                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1920                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1921                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1922                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1923                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1924                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1925                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1926                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1927                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1928                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1929                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1930                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1931                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1932                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1933
1934                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1935                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1936                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1937                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1938                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1939                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1940                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1941                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1942
1943                 if (unknown_flags_added)
1944                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1945
1946                 if (unknown_flags_removed)
1947                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1948         }
1949
1950         link_was_admin_up = link->flags & IFF_UP;
1951         had_carrier = link_has_carrier(link);
1952
1953         link->flags = flags;
1954         link->kernel_operstate = operstate;
1955
1956         link_update_operstate(link, true);
1957
1958         if (!link_was_admin_up && (link->flags & IFF_UP)) {
1959                 log_link_info(link, "Link UP");
1960
1961                 r = link_admin_state_up(link);
1962                 if (r < 0)
1963                         return r;
1964         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1965                 log_link_info(link, "Link DOWN");
1966
1967                 r = link_admin_state_down(link);
1968                 if (r < 0)
1969                         return r;
1970         }
1971
1972         if (!had_carrier && link_has_carrier(link)) {
1973                 log_link_info(link, "Gained carrier");
1974
1975                 r = link_carrier_gained(link);
1976                 if (r < 0)
1977                         return r;
1978         } else if (had_carrier && !link_has_carrier(link)) {
1979                 log_link_info(link, "Lost carrier");
1980
1981                 r = link_carrier_lost(link);
1982                 if (r < 0)
1983                         return r;
1984         }
1985
1986         return 0;
1987 }
1988
1989 static int link_update_master(Link *link, sd_netlink_message *message) {
1990         int master_ifindex, r;
1991
1992         assert(link);
1993         assert(message);
1994
1995         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1996         if (r == -ENODATA)
1997                 return 0;
1998         if (r < 0)
1999                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2000
2001         if (master_ifindex == link->ifindex)
2002                 master_ifindex = 0;
2003
2004         if (master_ifindex == link->master_ifindex)
2005                 return 0;
2006
2007         if (link->master_ifindex == 0)
2008                 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2009         else if (master_ifindex == 0)
2010                 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2011         else
2012                 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2013                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2014
2015         link_drop_from_master(link);
2016
2017         link->master_ifindex = master_ifindex;
2018
2019         r = link_append_to_master(link);
2020         if (r < 0)
2021                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2022
2023         return 0;
2024 }
2025
2026 static int link_update_driver(Link *link, sd_netlink_message *message) {
2027         int r;
2028
2029         assert(link);
2030         assert(link->manager);
2031         assert(message);
2032
2033         /* Driver is already read. Assuming the driver is never changed. */
2034         if (link->driver)
2035                 return 0;
2036
2037         /* When udevd is running, read the driver after the interface is initialized by udevd.
2038          * Otherwise, ethtool may not work correctly. See issue #22538.
2039          * When udevd is not running, read the value when the interface is detected. */
2040         if (link->state != (udev_available() ? LINK_STATE_INITIALIZED : LINK_STATE_PENDING))
2041                 return 0;
2042
2043         r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2044         if (r < 0) {
2045                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2046                 return 0;
2047         }
2048
2049         log_link_debug(link, "Found driver: %s", strna(link->driver));
2050
2051         if (streq_ptr(link->driver, "dsa")) {
2052                 uint32_t dsa_master_ifindex = 0;
2053
2054                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2055                 if (r < 0 && r != -ENODATA)
2056                         return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2057
2058                 if (dsa_master_ifindex > INT_MAX) {
2059                         log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2060                                        dsa_master_ifindex);
2061                         dsa_master_ifindex = 0;
2062                 }
2063
2064                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2065         }
2066
2067         return 0;
2068 }
2069
2070 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2071         int r;
2072
2073         assert(link);
2074         assert(link->manager);
2075         assert(message);
2076
2077         if (link->permanent_hw_addr.length > 0)
2078                 return 0;
2079
2080         /* When udevd is running, read the permanent hardware address after the interface is
2081          * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2082          * When udevd is not running, read the value when the interface is detected. */
2083         if (link->state != (udev_available() ? LINK_STATE_INITIALIZED : LINK_STATE_PENDING))
2084                 return 0;
2085
2086         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2087         if (r < 0) {
2088                 if (r != -ENODATA)
2089                         return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2090
2091                 if (netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL) >= 0) {
2092                         /* Fallback to ethtool, if the link has a hardware address. */
2093                         r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2094                         if (r < 0)
2095                                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2096                 }
2097         }
2098
2099         if (link->permanent_hw_addr.length > 0)
2100                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2101
2102         return 0;
2103 }
2104
2105 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2106         struct hw_addr_data addr;
2107         int r;
2108
2109         assert(link);
2110         assert(message);
2111
2112         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2113         if (r < 0 && r != -ENODATA)
2114                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2115
2116         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2117         if (r == -ENODATA)
2118                 return 0;
2119         if (r < 0)
2120                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2121
2122         if (hw_addr_equal(&link->hw_addr, &addr))
2123                 return 0;
2124
2125         if (link->hw_addr.length == 0)
2126                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2127         else {
2128                 log_link_debug(link, "Hardware address is changed: %s %s %s",
2129                                HW_ADDR_TO_STR(&link->hw_addr),
2130                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2131                                HW_ADDR_TO_STR(&addr));
2132
2133                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2134         }
2135
2136         link->hw_addr = addr;
2137
2138         if (!hw_addr_is_null(&link->hw_addr)) {
2139                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2140                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2141                         /* bonding master and its slaves have the same hardware address. */
2142                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2143                 if (r < 0)
2144                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2145         }
2146
2147         r = ipv4ll_update_mac(link);
2148         if (r < 0)
2149                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2150
2151         r = ipv4ll_update_mac(link);
2152         if (r < 0)
2153                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2154
2155         r = dhcp4_update_mac(link);
2156         if (r < 0)
2157                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2158
2159         r = dhcp6_update_mac(link);
2160         if (r < 0)
2161                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2162
2163         r = radv_update_mac(link);
2164         if (r < 0)
2165                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2166
2167         if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2168                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2169                 if (r < 0)
2170                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2171         }
2172
2173         if (link->lldp_rx) {
2174                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2175                 if (r < 0)
2176                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2177         }
2178
2179         if (link->lldp_tx) {
2180                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2181                 if (r < 0)
2182                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2183         }
2184
2185         return 0;
2186 }
2187
2188 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2189         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2190         int r;
2191
2192         assert(link);
2193         assert(message);
2194
2195         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2196         if (r == -ENODATA)
2197                 return 0;
2198         if (r < 0)
2199                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2200         if (mtu == 0)
2201                 return 0;
2202
2203         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2204         if (r < 0 && r != -ENODATA)
2205                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2206
2207         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2208         if (r < 0 && r != -ENODATA)
2209                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2210
2211         if (max_mtu == 0)
2212                 max_mtu = UINT32_MAX;
2213
2214         link->min_mtu = min_mtu;
2215         link->max_mtu = max_mtu;
2216
2217         if (link->original_mtu == 0) {
2218                 link->original_mtu = mtu;
2219                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2220                                link->original_mtu, link->min_mtu, link->max_mtu);
2221         }
2222
2223         if (link->mtu == mtu)
2224                 return 0;
2225
2226         if (link->mtu != 0)
2227                 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2228                                link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2229                                link->min_mtu, link->max_mtu);
2230
2231         link->mtu = mtu;
2232
2233         if (link->dhcp_client) {
2234                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2235                 if (r < 0)
2236                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2237         }
2238
2239         if (link->radv) {
2240                 r = sd_radv_set_mtu(link->radv, link->mtu);
2241                 if (r < 0)
2242                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2243         }
2244
2245         return 0;
2246 }
2247
2248 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2249         _cleanup_strv_free_ char **altnames = NULL;
2250         int r;
2251
2252         assert(link);
2253         assert(message);
2254
2255         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2256         if (r == -ENODATA)
2257                 /* The message does not have IFLA_PROP_LIST container attribute. It does not means the
2258                  * interface has no alternative name. */
2259                 return 0;
2260         if (r < 0)
2261                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2262
2263         if (strv_equal(altnames, link->alternative_names))
2264                 return 0;
2265
2266         STRV_FOREACH(n, link->alternative_names)
2267                 hashmap_remove(link->manager->links_by_name, *n);
2268
2269         strv_free_and_replace(link->alternative_names, altnames);
2270
2271         STRV_FOREACH(n, link->alternative_names) {
2272                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2273                 if (r < 0)
2274                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2275         }
2276
2277         return 0;
2278 }
2279
2280 static int link_update_name(Link *link, sd_netlink_message *message) {
2281         char ifname_from_index[IF_NAMESIZE];
2282         const char *ifname;
2283         int r;
2284
2285         assert(link);
2286         assert(message);
2287
2288         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2289         if (r == -ENODATA)
2290                 /* Hmm?? But ok. */
2291                 return 0;
2292         if (r < 0)
2293                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2294
2295         if (streq(ifname, link->ifname))
2296                 return 0;
2297
2298         r = format_ifname(link->ifindex, ifname_from_index);
2299         if (r < 0)
2300                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2301
2302         if (!streq(ifname, ifname_from_index)) {
2303                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2304                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2305                                ifname, ifname_from_index);
2306                 return 0;
2307         }
2308
2309         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2310
2311         hashmap_remove(link->manager->links_by_name, link->ifname);
2312
2313         r = free_and_strdup(&link->ifname, ifname);
2314         if (r < 0)
2315                 return log_oom_debug();
2316
2317         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2318         if (r < 0)
2319                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2320
2321         if (link->dhcp_client) {
2322                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2323                 if (r < 0)
2324                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2325         }
2326
2327         if (link->dhcp6_client) {
2328                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2329                 if (r < 0)
2330                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2331         }
2332
2333         if (link->ndisc) {
2334                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2335                 if (r < 0)
2336                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2337         }
2338
2339         if (link->dhcp_server) {
2340                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2341                 if (r < 0)
2342                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2343         }
2344
2345         if (link->radv) {
2346                 r = sd_radv_set_ifname(link->radv, link->ifname);
2347                 if (r < 0)
2348                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2349         }
2350
2351         if (link->lldp_rx) {
2352                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2353                 if (r < 0)
2354                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2355         }
2356
2357         if (link->lldp_tx) {
2358                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2359                 if (r < 0)
2360                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2361         }
2362
2363         if (link->ipv4ll) {
2364                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2365                 if (r < 0)
2366                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2367         }
2368
2369         r = ipv4acd_set_ifname(link);
2370         if (r < 0)
2371                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2372
2373         return 0;
2374 }
2375
2376 static int link_update(Link *link, sd_netlink_message *message) {
2377         int r;
2378
2379         assert(link);
2380         assert(message);
2381
2382         r = link_update_name(link, message);
2383         if (r < 0)
2384                 return r;
2385
2386         r = link_update_alternative_names(link, message);
2387         if (r < 0)
2388                 return r;
2389
2390         r = link_update_mtu(link, message);
2391         if (r < 0)
2392                 return r;
2393
2394         r = link_update_driver(link, message);
2395         if (r < 0)
2396                 return r;
2397
2398         r = link_update_permanent_hardware_address(link, message);
2399         if (r < 0)
2400                 return r;
2401
2402         r = link_update_hardware_address(link, message);
2403         if (r < 0)
2404                 return r;
2405
2406         r = link_update_master(link, message);
2407         if (r < 0)
2408                 return r;
2409
2410         r = link_update_ipv6ll_addrgen_mode(link, message);
2411         if (r < 0)
2412                 return r;
2413
2414         return link_update_flags(link, message);
2415 }
2416
2417 static Link *link_drop_or_unref(Link *link) {
2418         if (!link)
2419                 return NULL;
2420         if (!link->manager)
2421                 return link_unref(link);
2422         return link_drop(link);
2423 }
2424
2425 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2426
2427 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2428         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2429         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2430         unsigned short iftype;
2431         int r, ifindex;
2432
2433         assert(manager);
2434         assert(message);
2435         assert(ret);
2436
2437         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2438         if (r < 0)
2439                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2440         else if (ifindex <= 0)
2441                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2442
2443         r = sd_rtnl_message_link_get_type(message, &iftype);
2444         if (r < 0)
2445                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2446
2447         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2448         if (r < 0)
2449                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2450
2451         /* check for link kind */
2452         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2453         if (r >= 0) {
2454                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2455                 if (r < 0 && r != -ENODATA)
2456                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2457                 r = sd_netlink_message_exit_container(message);
2458                 if (r < 0)
2459                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2460         }
2461
2462         if (!manager->test_mode) {
2463                 /* Do not update state files when running in test mode. */
2464                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2465                         return log_oom_debug();
2466
2467                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2468                         return log_oom_debug();
2469
2470                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2471                         return log_oom_debug();
2472         }
2473
2474         link = new(Link, 1);
2475         if (!link)
2476                 return -ENOMEM;
2477
2478         *link = (Link) {
2479                 .n_ref = 1,
2480                 .state = LINK_STATE_PENDING,
2481                 .online_state = _LINK_ONLINE_STATE_INVALID,
2482                 .ifindex = ifindex,
2483                 .iftype = iftype,
2484                 .ifname = TAKE_PTR(ifname),
2485                 .kind = TAKE_PTR(kind),
2486
2487                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2488
2489                 .state_file = TAKE_PTR(state_file),
2490                 .lease_file = TAKE_PTR(lease_file),
2491                 .lldp_file = TAKE_PTR(lldp_file),
2492
2493                 .n_dns = UINT_MAX,
2494                 .dns_default_route = -1,
2495                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2496                 .mdns = _RESOLVE_SUPPORT_INVALID,
2497                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2498                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2499         };
2500
2501         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2502         if (r < 0)
2503                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2504
2505         link->manager = manager;
2506
2507         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2508         if (r < 0)
2509                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2510
2511         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2512                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2513
2514         *ret = TAKE_PTR(link);
2515         return 0;
2516 }
2517
2518 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2519         Link *link = NULL;
2520         NetDev *netdev = NULL;
2521         uint16_t type;
2522         const char *name;
2523         int r, ifindex;
2524
2525         assert(rtnl);
2526         assert(message);
2527         assert(manager);
2528
2529         if (sd_netlink_message_is_error(message)) {
2530                 r = sd_netlink_message_get_errno(message);
2531                 if (r < 0)
2532                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2533
2534                 return 0;
2535         }
2536
2537         r = sd_netlink_message_get_type(message, &type);
2538         if (r < 0) {
2539                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2540                 return 0;
2541         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2542                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2543                 return 0;
2544         }
2545
2546         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2547         if (r < 0) {
2548                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2549                 return 0;
2550         } else if (ifindex <= 0) {
2551                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2552                 return 0;
2553         }
2554
2555         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2556         if (r < 0) {
2557                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2558                 return 0;
2559         }
2560
2561         (void) link_get_by_index(manager, ifindex, &link);
2562         (void) netdev_get(manager, name, &netdev);
2563
2564         switch (type) {
2565         case RTM_NEWLINK:
2566                 if (netdev) {
2567                         /* netdev exists, so make sure the ifindex matches */
2568                         r = netdev_set_ifindex(netdev, message);
2569                         if (r < 0) {
2570                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2571                                 return 0;
2572                         }
2573                 }
2574
2575                 if (!link) {
2576                         /* link is new, so add it */
2577                         r = link_new(manager, message, &link);
2578                         if (r < 0) {
2579                                 log_warning_errno(r, "Could not process new link message: %m");
2580                                 return 0;
2581                         }
2582
2583                         r = link_update(link, message);
2584                         if (r < 0) {
2585                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2586                                 link_enter_failed(link);
2587                                 return 0;
2588                         }
2589
2590                         r = link_check_initialized(link);
2591                         if (r < 0) {
2592                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2593                                 link_enter_failed(link);
2594                                 return 0;
2595                         }
2596                 } else {
2597                         r = link_update(link, message);
2598                         if (r < 0) {
2599                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2600                                 link_enter_failed(link);
2601                                 return 0;
2602                         }
2603                 }
2604                 break;
2605
2606         case RTM_DELLINK:
2607                 link_drop(link);
2608                 netdev_drop(netdev);
2609                 break;
2610
2611         default:
2612                 assert_not_reached();
2613         }
2614
2615         return 1;
2616 }
2617
2618 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2619         uint16_t message_type;
2620         int r;
2621
2622         assert(m);
2623         assert(link);
2624         assert(error_msg);
2625
2626         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2627                 return 0;
2628
2629         r = sd_netlink_message_get_errno(m);
2630         if (r < 0) {
2631                 log_link_message_warning_errno(link, m, r, error_msg);
2632                 link_enter_failed(link);
2633                 return 0;
2634         }
2635
2636         r = sd_netlink_message_get_type(m, &message_type);
2637         if (r < 0) {
2638                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2639                 return 0;
2640         }
2641         if (message_type != RTM_NEWLINK) {
2642                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2643                 return 0;
2644         }
2645
2646         r = link_update(link, m);
2647         if (r < 0) {
2648                 link_enter_failed(link);
2649                 return 0;
2650         }
2651
2652         return 1;
2653 }
2654
2655 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2656         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2657         int r;
2658
2659         assert(link);
2660         assert(link->manager);
2661         assert(link->manager->rtnl);
2662         assert(callback);
2663
2664         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2665         if (r < 0)
2666                 return r;
2667
2668         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2669                                link_netlink_destroy_callback, link);
2670         if (r < 0)
2671                 return r;
2672
2673         link_ref(link);
2674         return 0;
2675 }
2676
2677 static const char* const link_state_table[_LINK_STATE_MAX] = {
2678         [LINK_STATE_PENDING]     = "pending",
2679         [LINK_STATE_INITIALIZED] = "initialized",
2680         [LINK_STATE_CONFIGURING] = "configuring",
2681         [LINK_STATE_CONFIGURED]  = "configured",
2682         [LINK_STATE_UNMANAGED]   = "unmanaged",
2683         [LINK_STATE_FAILED]      = "failed",
2684         [LINK_STATE_LINGER]      = "linger",
2685 };
2686
2687 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2688
2689 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2690         _cleanup_free_ char *str = NULL;
2691         static const char* map[] = {
2692                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2693                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid.*/
2694                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2695                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2696                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2697                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2698                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2699                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2700                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2701                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2702                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2703                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2704                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast.*/
2705                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2706                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2707                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2708                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2709                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2710                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2711         };
2712
2713         assert(ret);
2714
2715         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2716                 if (FLAGS_SET(flags, 1 << i) && map[i])
2717                         if (!strextend_with_separator(&str, ",", map[i]))
2718                                 return -ENOMEM;
2719
2720         *ret = TAKE_PTR(str);
2721         return 0;
2722 }
2723
2724 static const char * const kernel_operstate_table[] = {
2725         [IF_OPER_UNKNOWN]        = "unknown",
2726         [IF_OPER_NOTPRESENT]     = "not-present",
2727         [IF_OPER_DOWN]           = "down",
2728         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2729         [IF_OPER_TESTING]        = "testing",
2730         [IF_OPER_DORMANT]        = "dormant",
2731         [IF_OPER_UP]             = "up",
2732 };
2733
2734 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);