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 "logarithm.h"
  31 #include "missing_network.h"
  32 #include "netlink-util.h"
  33 #include "network-internal.h"
  34 #include "networkd-address-label.h"
  35 #include "networkd-address.h"
  36 #include "networkd-bridge-fdb.h"
  37 #include "networkd-bridge-mdb.h"
  38 #include "networkd-can.h"
  39 #include "networkd-dhcp-prefix-delegation.h"
  40 #include "networkd-dhcp-server.h"
  41 #include "networkd-dhcp4.h"
  42 #include "networkd-dhcp6.h"
  43 #include "networkd-ipv4acd.h"
  44 #include "networkd-ipv4ll.h"
  45 #include "networkd-ipv6-proxy-ndp.h"
  46 #include "networkd-link-bus.h"
  47 #include "networkd-link.h"
  48 #include "networkd-lldp-tx.h"
  49 #include "networkd-manager.h"
  50 #include "networkd-ndisc.h"
  51 #include "networkd-neighbor.h"
  52 #include "networkd-nexthop.h"
  53 #include "networkd-queue.h"
  54 #include "networkd-radv.h"
  55 #include "networkd-route.h"
  56 #include "networkd-routing-policy-rule.h"
  57 #include "networkd-setlink.h"
  58 #include "networkd-sriov.h"
  59 #include "networkd-state-file.h"
  60 #include "networkd-sysctl.h"
  61 #include "networkd-wifi.h"
  62 #include "set.h"
  63 #include "socket-util.h"
  64 #include "stdio-util.h"
  65 #include "string-table.h"
  66 #include "strv.h"
  67 #include "tc.h"
  68 #include "tmpfile-util.h"
  69 #include "tuntap.h"
  70 #include "udev-util.h"
  71 #include "vrf.h"
  72
  73 bool link_ipv6_enabled(Link *link) {
  74         assert(link);
  75
  76         if (!socket_ipv6_is_supported())
  77                 return false;
  78
  79         if (link->iftype == ARPHRD_CAN)
  80                 return false;
  81
  82         if (!link->network)
  83                 return false;
  84
  85         if (link->network->bond)
  86                 return false;
  87
  88         if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
  89                 return true;
  90
  91         if (network_has_static_ipv6_configurations(link->network))
  92                 return true;
  93
  94         return false;
  95 }
  96
  97 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
  98         assert(link);
  99
 100         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
 101                 return false;
 102
 103         if (!link->network)
 104                 return allow_unmanaged;
 105
 106         if (!link->network->configure_without_carrier) {
 107                 if (link->set_flags_messages > 0)
 108                         return false;
 109
 110                 if (!link_has_carrier(link))
 111                         return false;
 112         }
 113
 114         if (link->set_link_messages > 0)
 115                 return false;
 116
 117         if (!link->activated)
 118                 return false;
 119
 120         return true;
 121 }
 122
 123 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
 124         return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
 125 }
 126
 127 void link_ntp_settings_clear(Link *link) {
 128         link->ntp = strv_free(link->ntp);
 129 }
 130
 131 void link_dns_settings_clear(Link *link) {
 132         if (link->n_dns != UINT_MAX)
 133                 for (unsigned i = 0; i < link->n_dns; i++)
 134                         in_addr_full_free(link->dns[i]);
 135         link->dns = mfree(link->dns);
 136         link->n_dns = UINT_MAX;
 137
 138         link->search_domains = ordered_set_free(link->search_domains);
 139         link->route_domains = ordered_set_free(link->route_domains);
 140
 141         link->dns_default_route = -1;
 142         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 143         link->mdns = _RESOLVE_SUPPORT_INVALID;
 144         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 145         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 146
 147         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 148 }
 149
 150 static void link_free_engines(Link *link) {
 151         if (!link)
 152                 return;
 153
 154         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 155
 156         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 157         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 158         link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
 159
 160         link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
 161         link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
 162
 163         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 164
 165         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 166         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 167
 168         link->ndisc = sd_ndisc_unref(link->ndisc);
 169         link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
 170         ndisc_flush(link);
 171
 172         link->radv = sd_radv_unref(link->radv);
 173 }
 174
 175 static Link *link_free(Link *link) {
 176         assert(link);
 177
 178         link_ntp_settings_clear(link);
 179         link_dns_settings_clear(link);
 180
 181         link->routes = set_free(link->routes);
 182         link->nexthops = set_free(link->nexthops);
 183         link->neighbors = set_free(link->neighbors);
 184         link->addresses = set_free(link->addresses);
 185         link->qdiscs = set_free(link->qdiscs);
 186         link->tclasses = set_free(link->tclasses);
 187
 188         link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
 189
 190         link_free_engines(link);
 191
 192         set_free(link->sr_iov_virt_port_ifindices);
 193         free(link->ifname);
 194         strv_free(link->alternative_names);
 195         free(link->kind);
 196         free(link->ssid);
 197         free(link->previous_ssid);
 198         free(link->driver);
 199
 200         unlink_and_free(link->lease_file);
 201         unlink_and_free(link->lldp_file);
 202         unlink_and_free(link->state_file);
 203
 204         sd_device_unref(link->dev);
 205         netdev_unref(link->netdev);
 206
 207         hashmap_free(link->bound_to_links);
 208         hashmap_free(link->bound_by_links);
 209
 210         set_free_with_destructor(link->slaves, link_unref);
 211
 212         network_unref(link->network);
 213
 214         sd_event_source_disable_unref(link->carrier_lost_timer);
 215
 216         return mfree(link);
 217 }
 218
 219 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 220
 221 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
 222         Link *link;
 223
 224         assert(m);
 225         assert(ifindex > 0);
 226
 227         link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
 228         if (!link)
 229                 return -ENODEV;
 230
 231         if (ret)
 232                 *ret = link;
 233         return 0;
 234 }
 235
 236 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
 237         Link *link;
 238
 239         assert(m);
 240         assert(ifname);
 241
 242         link = hashmap_get(m->links_by_name, ifname);
 243         if (!link)
 244                 return -ENODEV;
 245
 246         if (ret)
 247                 *ret = link;
 248         return 0;
 249 }
 250
 251 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
 252         Link *link;
 253
 254         assert(m);
 255         assert(hw_addr);
 256
 257         link = hashmap_get(m->links_by_hw_addr, hw_addr);
 258         if (!link)
 259                 return -ENODEV;
 260
 261         if (ret)
 262                 *ret = link;
 263         return 0;
 264 }
 265
 266 int link_get_master(Link *link, Link **ret) {
 267         assert(link);
 268         assert(link->manager);
 269         assert(ret);
 270
 271         if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
 272                 return -ENODEV;
 273
 274         return link_get_by_index(link->manager, link->master_ifindex, ret);
 275 }
 276
 277 void link_set_state(Link *link, LinkState state) {
 278         assert(link);
 279
 280         if (link->state == state)
 281                 return;
 282
 283         log_link_debug(link, "State changed: %s -> %s",
 284                        link_state_to_string(link->state),
 285                        link_state_to_string(state));
 286
 287         link->state = state;
 288
 289         link_send_changed(link, "AdministrativeState", NULL);
 290         link_dirty(link);
 291 }
 292
 293 int link_stop_engines(Link *link, bool may_keep_dhcp) {
 294         int r = 0, k;
 295
 296         assert(link);
 297         assert(link->manager);
 298         assert(link->manager->event);
 299
 300         bool keep_dhcp = may_keep_dhcp &&
 301                          link->network &&
 302                          !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
 303                          (link->manager->restarting ||
 304                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 305
 306         if (!keep_dhcp) {
 307                 k = sd_dhcp_client_stop(link->dhcp_client);
 308                 if (k < 0)
 309                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 310         }
 311
 312         k = sd_dhcp_server_stop(link->dhcp_server);
 313         if (k < 0)
 314                 r = log_link_warning_errno(link, k, "Could not stop DHCPv4 server: %m");
 315
 316         k = sd_lldp_rx_stop(link->lldp_rx);
 317         if (k < 0)
 318                 r = log_link_warning_errno(link, k, "Could not stop LLDP Rx: %m");
 319
 320         k = sd_lldp_tx_stop(link->lldp_tx);
 321         if (k < 0)
 322                 r = log_link_warning_errno(link, k, "Could not stop LLDP Tx: %m");
 323
 324         k = sd_ipv4ll_stop(link->ipv4ll);
 325         if (k < 0)
 326                 r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 327
 328         k = ipv4acd_stop(link);
 329         if (k < 0)
 330                 r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 331
 332         k = sd_dhcp6_client_stop(link->dhcp6_client);
 333         if (k < 0)
 334                 r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 335
 336         k = dhcp_pd_remove(link, /* only_marked = */ false);
 337         if (k < 0)
 338                 r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 339
 340         k = ndisc_stop(link);
 341         if (k < 0)
 342                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 343
 344         ndisc_flush(link);
 345
 346         k = sd_radv_stop(link->radv);
 347         if (k < 0)
 348                 r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 349
 350         return r;
 351 }
 352
 353 void link_enter_failed(Link *link) {
 354         assert(link);
 355
 356         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 357                 return;
 358
 359         log_link_warning(link, "Failed");
 360
 361         link_set_state(link, LINK_STATE_FAILED);
 362
 363         (void) link_stop_engines(link, false);
 364 }
 365
 366 void link_check_ready(Link *link) {
 367         Address *a;
 368
 369         assert(link);
 370
 371         if (link->state == LINK_STATE_CONFIGURED)
 372                 return;
 373
 374         if (link->state != LINK_STATE_CONFIGURING)
 375                 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
 376
 377         if (!link->network)
 378                 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
 379
 380         if (!link->tc_configured)
 381                 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
 382
 383         if (link->set_link_messages > 0)
 384                 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
 385
 386         if (!link->activated)
 387                 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
 388
 389         if (link->iftype == ARPHRD_CAN) {
 390                 /* let's shortcut things for CAN which doesn't need most of checks below. */
 391                 link_set_state(link, LINK_STATE_CONFIGURED);
 392                 return;
 393         }
 394
 395         if (!link->stacked_netdevs_created)
 396                 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
 397
 398         if (!link->static_addresses_configured)
 399                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 400
 401         if (!link->static_address_labels_configured)
 402                 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
 403
 404         if (!link->static_bridge_fdb_configured)
 405                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 406
 407         if (!link->static_bridge_mdb_configured)
 408                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 409
 410         if (!link->static_ipv6_proxy_ndp_configured)
 411                 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
 412
 413         if (!link->static_neighbors_configured)
 414                 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
 415
 416         if (!link->static_nexthops_configured)
 417                 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
 418
 419         if (!link->static_routes_configured)
 420                 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
 421
 422         if (!link->static_routing_policy_rules_configured)
 423                 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
 424
 425         if (!link->sr_iov_configured)
 426                 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
 427
 428         /* IPv6LL is assigned after the link gains its carrier. */
 429         if (!link->network->configure_without_carrier &&
 430             link_ipv6ll_enabled(link) &&
 431             !in6_addr_is_set(&link->ipv6ll_address))
 432                 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
 433
 434         /* All static addresses must be ready. */
 435         bool has_static_address = false;
 436         SET_FOREACH(a, link->addresses) {
 437                 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
 438                         continue;
 439                 if (!address_is_ready(a))
 440                         return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
 441                                                      IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
 442                 has_static_address = true;
 443         }
 444
 445         /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
 446         if (has_static_address)
 447                 goto ready;
 448
 449         /* If no dynamic addressing protocol enabled, assume the interface is ready.
 450          * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
 451         if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
 452             !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
 453             (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
 454                 goto ready;
 455
 456         bool ipv4ll_ready =
 457                 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
 458                 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
 459         bool dhcp4_ready =
 460                 link_dhcp4_enabled(link) && link->dhcp4_configured &&
 461                 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
 462         bool dhcp6_ready =
 463                 link_dhcp6_enabled(link) && link->dhcp6_configured &&
 464                 (!link->network->dhcp6_use_address ||
 465                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
 466         bool dhcp_pd_ready =
 467                 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
 468                 (!link->network->dhcp_pd_assign ||
 469                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
 470         bool ndisc_ready =
 471                 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
 472                 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
 473                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
 474
 475         /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
 476         if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
 477                 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
 478                     link->dhcp_lease && dhcp4_lease_has_pd_prefix(link->dhcp_lease)) {
 479                         if (!dhcp4_ready)
 480                                 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
 481                         if (!dhcp_pd_ready)
 482                                 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
 483                 }
 484
 485                 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
 486                     link->dhcp6_lease && dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
 487                         if (!dhcp6_ready)
 488                                 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
 489                         if (!dhcp_pd_ready)
 490                                 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
 491                 }
 492         }
 493
 494         /* At least one dynamic addressing protocol is finished. */
 495         if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
 496                 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
 497
 498         log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
 499                        __func__,
 500                        yes_no(ipv4ll_ready),
 501                        yes_no(dhcp4_ready),
 502                        yes_no(dhcp6_ready),
 503                        yes_no(dhcp_pd_ready),
 504                        yes_no(ndisc_ready));
 505
 506 ready:
 507         link_set_state(link, LINK_STATE_CONFIGURED);
 508 }
 509
 510 static int link_request_static_configs(Link *link) {
 511         int r;
 512
 513         assert(link);
 514         assert(link->network);
 515         assert(link->state != _LINK_STATE_INVALID);
 516
 517         r = link_request_static_addresses(link);
 518         if (r < 0)
 519                 return r;
 520
 521         r = link_request_static_address_labels(link);
 522         if (r < 0)
 523                 return r;
 524
 525         r = link_request_static_bridge_fdb(link);
 526         if (r < 0)
 527                 return r;
 528
 529         r = link_request_static_bridge_mdb(link);
 530         if (r < 0)
 531                 return r;
 532
 533         r = link_request_static_ipv6_proxy_ndp_addresses(link);
 534         if (r < 0)
 535                 return r;
 536
 537         r = link_request_static_neighbors(link);
 538         if (r < 0)
 539                 return r;
 540
 541         r = link_request_static_nexthops(link, false);
 542         if (r < 0)
 543                 return r;
 544
 545         r = link_request_static_routes(link, false);
 546         if (r < 0)
 547                 return r;
 548
 549         r = link_request_static_routing_policy_rules(link);
 550         if (r < 0)
 551                 return r;
 552
 553         return 0;
 554 }
 555
 556 static int link_request_stacked_netdevs(Link *link) {
 557         NetDev *netdev;
 558         int r;
 559
 560         assert(link);
 561
 562         link->stacked_netdevs_created = false;
 563
 564         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 565                 r = link_request_stacked_netdev(link, netdev);
 566                 if (r < 0)
 567                         return r;
 568         }
 569
 570         if (link->create_stacked_netdev_messages == 0) {
 571                 link->stacked_netdevs_created = true;
 572                 link_check_ready(link);
 573         }
 574
 575         return 0;
 576 }
 577
 578 static int link_acquire_dynamic_ipv6_conf(Link *link) {
 579         int r;
 580
 581         assert(link);
 582
 583         r = radv_start(link);
 584         if (r < 0)
 585                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 586
 587         r = ndisc_start(link);
 588         if (r < 0)
 589                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 590
 591         r = dhcp6_start(link);
 592         if (r < 0)
 593                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 594
 595         return 0;
 596 }
 597
 598 static int link_acquire_dynamic_ipv4_conf(Link *link) {
 599         int r;
 600
 601         assert(link);
 602         assert(link->manager);
 603         assert(link->manager->event);
 604
 605         if (link->dhcp_client) {
 606                 r = dhcp4_start(link);
 607                 if (r < 0)
 608                         return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
 609
 610                 log_link_debug(link, "Acquiring DHCPv4 lease.");
 611
 612         } else if (link->ipv4ll) {
 613                 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
 614                         r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
 615                         if (r < 0)
 616                                 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
 617                 }
 618
 619                 r = sd_ipv4ll_start(link->ipv4ll);
 620                 if (r < 0)
 621                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
 622
 623                 log_link_debug(link, "Acquiring IPv4 link-local address.");
 624         }
 625
 626         if (link->dhcp_server) {
 627                 r = sd_dhcp_server_start(link->dhcp_server);
 628                 if (r < 0)
 629                         return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
 630         }
 631
 632         r = ipv4acd_start(link);
 633         if (r < 0)
 634                 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
 635
 636         return 0;
 637 }
 638
 639 static int link_acquire_dynamic_conf(Link *link) {
 640         int r;
 641
 642         assert(link);
 643         assert(link->network);
 644
 645         r = link_acquire_dynamic_ipv4_conf(link);
 646         if (r < 0)
 647                 return r;
 648
 649         if (in6_addr_is_set(&link->ipv6ll_address)) {
 650                 r = link_acquire_dynamic_ipv6_conf(link);
 651                 if (r < 0)
 652                         return r;
 653         }
 654
 655         if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
 656                 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
 657                  * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
 658                  * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
 659                  * below will be called in radv_start(). */
 660                 r = dhcp_request_prefix_delegation(link);
 661                 if (r < 0)
 662                         return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 663         }
 664
 665         if (link->lldp_tx) {
 666                 r = sd_lldp_tx_start(link->lldp_tx);
 667                 if (r < 0)
 668                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
 669         }
 670
 671         if (link->lldp_rx) {
 672                 r = sd_lldp_rx_start(link->lldp_rx);
 673                 if (r < 0)
 674                         return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
 675         }
 676
 677         return 0;
 678 }
 679
 680 int link_ipv6ll_gained(Link *link) {
 681         int r;
 682
 683         assert(link);
 684
 685         log_link_info(link, "Gained IPv6LL");
 686
 687         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 688                 return 0;
 689
 690         r = link_acquire_dynamic_ipv6_conf(link);
 691         if (r < 0)
 692                 return r;
 693
 694         link_check_ready(link);
 695         return 0;
 696 }
 697
 698 int link_handle_bound_to_list(Link *link) {
 699         bool required_up = false;
 700         bool link_is_up = false;
 701         Link *l;
 702
 703         assert(link);
 704
 705         /* If at least one interface in bound_to_links has carrier, then make this interface up.
 706          * If all interfaces in bound_to_links do not, then make this interface down. */
 707
 708         if (hashmap_isempty(link->bound_to_links))
 709                 return 0;
 710
 711         if (link->flags & IFF_UP)
 712                 link_is_up = true;
 713
 714         HASHMAP_FOREACH(l, link->bound_to_links)
 715                 if (link_has_carrier(l)) {
 716                         required_up = true;
 717                         break;
 718                 }
 719
 720         if (!required_up && link_is_up)
 721                 return link_request_to_bring_up_or_down(link, /* up = */ false);
 722         if (required_up && !link_is_up)
 723                 return link_request_to_bring_up_or_down(link, /* up = */ true);
 724
 725         return 0;
 726 }
 727
 728 static int link_handle_bound_by_list(Link *link) {
 729         Link *l;
 730         int r;
 731
 732         assert(link);
 733
 734         /* Update up or down state of interfaces which depend on this interface's carrier state. */
 735
 736         if (hashmap_isempty(link->bound_by_links))
 737                 return 0;
 738
 739         HASHMAP_FOREACH(l, link->bound_by_links) {
 740                 r = link_handle_bound_to_list(l);
 741                 if (r < 0)
 742                         return r;
 743         }
 744
 745         return 0;
 746 }
 747
 748 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
 749         int r;
 750
 751         assert(link);
 752         assert(carrier);
 753
 754         if (link == carrier)
 755                 return 0;
 756
 757         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
 758                 return 0;
 759
 760         r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
 761         if (r < 0)
 762                 return r;
 763
 764         link_dirty(link);
 765
 766         return 0;
 767 }
 768
 769 static int link_new_bound_by_list(Link *link) {
 770         Manager *m;
 771         Link *carrier;
 772         int r;
 773
 774         assert(link);
 775         assert(link->manager);
 776
 777         m = link->manager;
 778
 779         HASHMAP_FOREACH(carrier, m->links_by_index) {
 780                 if (!carrier->network)
 781                         continue;
 782
 783                 if (strv_isempty(carrier->network->bind_carrier))
 784                         continue;
 785
 786                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
 787                         r = link_put_carrier(link, carrier, &link->bound_by_links);
 788                         if (r < 0)
 789                                 return r;
 790                 }
 791         }
 792
 793         HASHMAP_FOREACH(carrier, link->bound_by_links) {
 794                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
 795                 if (r < 0)
 796                         return r;
 797         }
 798
 799         return 0;
 800 }
 801
 802 static int link_new_bound_to_list(Link *link) {
 803         Manager *m;
 804         Link *carrier;
 805         int r;
 806
 807         assert(link);
 808         assert(link->manager);
 809
 810         if (!link->network)
 811                 return 0;
 812
 813         if (strv_isempty(link->network->bind_carrier))
 814                 return 0;
 815
 816         m = link->manager;
 817
 818         HASHMAP_FOREACH(carrier, m->links_by_index) {
 819                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
 820                         r = link_put_carrier(link, carrier, &link->bound_to_links);
 821                         if (r < 0)
 822                                 return r;
 823                 }
 824         }
 825
 826         HASHMAP_FOREACH(carrier, link->bound_to_links) {
 827                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
 828                 if (r < 0)
 829                         return r;
 830         }
 831
 832         return 0;
 833 }
 834
 835 static void link_free_bound_to_list(Link *link) {
 836         bool updated = false;
 837         Link *bound_to;
 838
 839         assert(link);
 840
 841         while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
 842                 updated = true;
 843
 844                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
 845                         link_dirty(bound_to);
 846         }
 847
 848         if (updated)
 849                 link_dirty(link);
 850 }
 851
 852 static void link_free_bound_by_list(Link *link) {
 853         bool updated = false;
 854         Link *bound_by;
 855
 856         assert(link);
 857
 858         while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
 859                 updated = true;
 860
 861                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
 862                         link_dirty(bound_by);
 863                         link_handle_bound_to_list(bound_by);
 864                 }
 865         }
 866
 867         if (updated)
 868                 link_dirty(link);
 869 }
 870
 871 static int link_append_to_master(Link *link) {
 872         Link *master;
 873         int r;
 874
 875         assert(link);
 876
 877         /* - The link may have no master.
 878          * - RTM_NEWLINK message about master interface may not be received yet. */
 879         if (link_get_master(link, &master) < 0)
 880                 return 0;
 881
 882         r = set_ensure_put(&master->slaves, NULL, link);
 883         if (r <= 0)
 884                 return r;
 885
 886         link_ref(link);
 887         return 0;
 888 }
 889
 890 static void link_drop_from_master(Link *link) {
 891         Link *master;
 892
 893         assert(link);
 894
 895         if (!link->manager)
 896                 return;
 897
 898         if (link_get_master(link, &master) < 0)
 899                 return;
 900
 901         link_unref(set_remove(master->slaves, link));
 902 }
 903
 904 static void link_drop_requests(Link *link) {
 905         Request *req;
 906
 907         assert(link);
 908         assert(link->manager);
 909
 910         ORDERED_SET_FOREACH(req, link->manager->request_queue)
 911                 if (req->link == link)
 912                         request_detach(link->manager, req);
 913 }
 914
 915 static Link *link_drop(Link *link) {
 916         if (!link)
 917                 return NULL;
 918
 919         assert(link->manager);
 920
 921         link_set_state(link, LINK_STATE_LINGER);
 922
 923         /* Drop all references from other links and manager. Note that async netlink calls may have
 924          * references to the link, and they will be dropped when we receive replies. */
 925
 926         link_drop_requests(link);
 927
 928         link_free_bound_to_list(link);
 929         link_free_bound_by_list(link);
 930
 931         link_clear_sr_iov_ifindices(link);
 932
 933         link_drop_from_master(link);
 934
 935         if (link->state_file)
 936                 (void) unlink(link->state_file);
 937
 938         link_clean(link);
 939
 940         STRV_FOREACH(n, link->alternative_names)
 941                 hashmap_remove(link->manager->links_by_name, *n);
 942         hashmap_remove(link->manager->links_by_name, link->ifname);
 943
 944         /* bonding master and its slaves have the same hardware address. */
 945         hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
 946
 947         /* The following must be called at last. */
 948         assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
 949         return link_unref(link);
 950 }
 951
 952 static int link_drop_foreign_config(Link *link) {
 953         int k, r;
 954
 955         assert(link);
 956         assert(link->manager);
 957
 958         /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
 959          * to remove loopback address or addresses used for root NFS. */
 960
 961         if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
 962                 return 0;
 963         if (FLAGS_SET(link->flags, IFF_LOOPBACK))
 964                 return 0;
 965         if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
 966                 return 0;
 967
 968         r = link_drop_foreign_routes(link);
 969
 970         k = link_drop_foreign_nexthops(link);
 971         if (k < 0 && r >= 0)
 972                 r = k;
 973
 974         k = link_drop_foreign_addresses(link);
 975         if (k < 0 && r >= 0)
 976                 r = k;
 977
 978         k = link_drop_foreign_neighbors(link);
 979         if (k < 0 && r >= 0)
 980                 r = k;
 981
 982         k = manager_drop_foreign_routing_policy_rules(link->manager);
 983         if (k < 0 && r >= 0)
 984                 r = k;
 985
 986         return r;
 987 }
 988
 989 static int link_drop_managed_config(Link *link) {
 990         int k, r;
 991
 992         assert(link);
 993         assert(link->manager);
 994
 995         r = link_drop_managed_routes(link);
 996
 997         k = link_drop_managed_nexthops(link);
 998         if (k < 0 && r >= 0)
 999                 r = k;
1000
1001         k = link_drop_managed_addresses(link);
1002         if (k < 0 && r >= 0)
1003                 r = k;
1004
1005         k = link_drop_managed_neighbors(link);
1006         if (k < 0 && r >= 0)
1007                 r = k;
1008
1009         k = link_drop_managed_routing_policy_rules(link);
1010         if (k < 0 && r >= 0)
1011                 r = k;
1012
1013         return r;
1014 }
1015
1016 static void link_foreignize_config(Link *link) {
1017         assert(link);
1018         assert(link->manager);
1019
1020         link_foreignize_routes(link);
1021         link_foreignize_nexthops(link);
1022         link_foreignize_addresses(link);
1023         link_foreignize_neighbors(link);
1024         link_foreignize_routing_policy_rules(link);
1025 }
1026
1027 static int link_configure(Link *link) {
1028         int r;
1029
1030         assert(link);
1031         assert(link->network);
1032         assert(link->state == LINK_STATE_INITIALIZED);
1033
1034         link_set_state(link, LINK_STATE_CONFIGURING);
1035
1036         r = link_new_bound_to_list(link);
1037         if (r < 0)
1038                 return r;
1039
1040         r = link_request_traffic_control(link);
1041         if (r < 0)
1042                 return r;
1043
1044         if (link->iftype == ARPHRD_CAN) {
1045                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1046                 r = link_request_to_set_can(link);
1047                 if (r < 0)
1048                         return r;
1049
1050                 return link_request_to_activate(link);
1051         }
1052
1053         r = link_request_sr_iov_vfs(link);
1054         if (r < 0)
1055                 return r;
1056
1057         r = link_set_sysctl(link);
1058         if (r < 0)
1059                 return r;
1060
1061         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1062         if (r < 0)
1063                 return r;
1064
1065         r = link_request_to_set_ipoib(link);
1066         if (r < 0)
1067                 return r;
1068
1069         r = link_request_to_set_flags(link);
1070         if (r < 0)
1071                 return r;
1072
1073         r = link_request_to_set_group(link);
1074         if (r < 0)
1075                 return r;
1076
1077         r = link_configure_mtu(link);
1078         if (r < 0)
1079                 return r;
1080
1081         r = link_request_to_set_addrgen_mode(link);
1082         if (r < 0)
1083                 return r;
1084
1085         r = link_request_to_set_master(link);
1086         if (r < 0)
1087                 return r;
1088
1089         r = link_request_stacked_netdevs(link);
1090         if (r < 0)
1091                 return r;
1092
1093         r = link_request_to_set_bond(link);
1094         if (r < 0)
1095                 return r;
1096
1097         r = link_request_to_set_bridge(link);
1098         if (r < 0)
1099                 return r;
1100
1101         r = link_request_to_set_bridge_vlan(link);
1102         if (r < 0)
1103                 return r;
1104
1105         r = link_request_to_activate(link);
1106         if (r < 0)
1107                 return r;
1108
1109         r = ipv4ll_configure(link);
1110         if (r < 0)
1111                 return r;
1112
1113         r = link_request_dhcp4_client(link);
1114         if (r < 0)
1115                 return r;
1116
1117         r = link_request_dhcp6_client(link);
1118         if (r < 0)
1119                 return r;
1120
1121         r = link_request_ndisc(link);
1122         if (r < 0)
1123                 return r;
1124
1125         r = link_request_dhcp_server(link);
1126         if (r < 0)
1127                 return r;
1128
1129         r = link_request_radv(link);
1130         if (r < 0)
1131                 return r;
1132
1133         r = link_lldp_rx_configure(link);
1134         if (r < 0)
1135                 return r;
1136
1137         r = link_lldp_tx_configure(link);
1138         if (r < 0)
1139                 return r;
1140
1141         r = link_drop_foreign_config(link);
1142         if (r < 0)
1143                 return r;
1144
1145         r = link_request_static_configs(link);
1146         if (r < 0)
1147                 return r;
1148
1149         if (!link_has_carrier(link))
1150                 return 0;
1151
1152         return link_acquire_dynamic_conf(link);
1153 }
1154
1155 static int link_get_network(Link *link, Network **ret) {
1156         Network *network;
1157         int r;
1158
1159         assert(link);
1160         assert(link->manager);
1161         assert(ret);
1162
1163         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1164                 bool warn = false;
1165
1166                 r = net_match_config(
1167                                 &network->match,
1168                                 link->dev,
1169                                 &link->hw_addr,
1170                                 &link->permanent_hw_addr,
1171                                 link->driver,
1172                                 link->iftype,
1173                                 link->kind,
1174                                 link->ifname,
1175                                 link->alternative_names,
1176                                 link->wlan_iftype,
1177                                 link->ssid,
1178                                 &link->bssid);
1179                 if (r < 0)
1180                         return r;
1181                 if (r == 0)
1182                         continue;
1183
1184                 if (network->match.ifname && link->dev) {
1185                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1186                         const char *attr;
1187
1188                         if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1189                                 (void) safe_atou8(attr, &name_assign_type);
1190
1191                         warn = name_assign_type == NET_NAME_ENUM;
1192                 }
1193
1194                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1195                               "found matching network '%s'%s.",
1196                               network->filename,
1197                               warn ? ", based on potentially unpredictable interface name" : "");
1198
1199                 if (network->unmanaged)
1200                         return -ENOENT;
1201
1202                 *ret = network;
1203                 return 0;
1204         }
1205
1206         return -ENOENT;
1207 }
1208
1209 int link_reconfigure_impl(Link *link, bool force) {
1210         Network *network = NULL;
1211         NetDev *netdev = NULL;
1212         int r;
1213
1214         assert(link);
1215
1216         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1217                 return 0;
1218
1219         r = netdev_get(link->manager, link->ifname, &netdev);
1220         if (r < 0 && r != -ENOENT)
1221                 return r;
1222
1223         r = link_get_network(link, &network);
1224         if (r < 0 && r != -ENOENT)
1225                 return r;
1226
1227         if (link->state != LINK_STATE_UNMANAGED && !network)
1228                 /* If link is in initialized state, then link->network is also NULL. */
1229                 force = true;
1230
1231         if (link->network == network && !force)
1232                 return 0;
1233
1234         if (network) {
1235                 if (link->state == LINK_STATE_INITIALIZED)
1236                         log_link_info(link, "Configuring with %s.", network->filename);
1237                 else
1238                         log_link_info(link, "Reconfiguring with %s.", network->filename);
1239         } else
1240                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1241                               "Unmanaging interface.");
1242
1243         /* Dropping old .network file */
1244         r = link_stop_engines(link, false);
1245         if (r < 0)
1246                 return r;
1247
1248         link_drop_requests(link);
1249
1250         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1251                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1252                  * routes, and so on) foreign, and then drop unnecessary configs later by
1253                  * link_drop_foreign_config() in link_configure().
1254                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1255                  * here we need to drop the configs such as addresses, routes, and so on configured by
1256                  * the previously assigned .network file. */
1257                 link_foreignize_config(link);
1258         else {
1259                 /* Remove all managed configs. Note, foreign configs are removed in later by
1260                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1261                 r = link_drop_managed_config(link);
1262                 if (r < 0)
1263                         return r;
1264         }
1265
1266         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1267          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1268          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1269          * map here, as it depends on .network files assigned to other links. */
1270         link_free_bound_to_list(link);
1271
1272         link_free_engines(link);
1273         link->network = network_unref(link->network);
1274
1275         netdev_unref(link->netdev);
1276         link->netdev = netdev_ref(netdev);
1277
1278         if (!network) {
1279                 link_set_state(link, LINK_STATE_UNMANAGED);
1280                 return 0;
1281         }
1282
1283         /* Then, apply new .network file */
1284         link->network = network_ref(network);
1285         link_update_operstate(link, true);
1286         link_dirty(link);
1287
1288         link_set_state(link, LINK_STATE_INITIALIZED);
1289         link->activated = false;
1290
1291         r = link_configure(link);
1292         if (r < 0)
1293                 return r;
1294
1295         return 1;
1296 }
1297
1298 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1299         int r;
1300
1301         assert(link);
1302
1303         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1304         if (r <= 0)
1305                 return r;
1306
1307         r = link_reconfigure_impl(link, force);
1308         if (r < 0) {
1309                 link_enter_failed(link);
1310                 return 0;
1311         }
1312
1313         return r;
1314 }
1315
1316 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1317         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1318 }
1319
1320 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1321         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1322 }
1323
1324 int link_reconfigure(Link *link, bool force) {
1325         int r;
1326
1327         assert(link);
1328
1329         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1330          * the function from being called multiple times simultaneously, refuse to reconfigure the
1331          * interface in these cases. */
1332         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1333                 return 0; /* 0 means no-op. */
1334
1335         r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1336         if (r < 0)
1337                 return r;
1338
1339         return 1; /* 1 means the interface will be reconfigured. */
1340 }
1341
1342 static int link_initialized_and_synced(Link *link) {
1343         int r;
1344
1345         assert(link);
1346         assert(link->manager);
1347
1348         if (link->manager->test_mode) {
1349                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1350                 link_set_state(link, LINK_STATE_UNMANAGED);
1351                 return 0;
1352         }
1353
1354         if (link->state == LINK_STATE_PENDING) {
1355                 log_link_debug(link, "Link state is up-to-date");
1356                 link_set_state(link, LINK_STATE_INITIALIZED);
1357
1358                 r = link_new_bound_by_list(link);
1359                 if (r < 0)
1360                         return r;
1361
1362                 r = link_handle_bound_by_list(link);
1363                 if (r < 0)
1364                         return r;
1365         }
1366
1367         return link_reconfigure_impl(link, /* force = */ false);
1368 }
1369
1370 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1371         int r;
1372
1373         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1374         if (r <= 0)
1375                 return r;
1376
1377         r = link_initialized_and_synced(link);
1378         if (r < 0)
1379                 link_enter_failed(link);
1380
1381         return 0;
1382 }
1383
1384 static int link_initialized(Link *link, sd_device *device) {
1385         int r;
1386
1387         assert(link);
1388         assert(device);
1389
1390         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1391          * or sysattrs) may be outdated. */
1392         device_unref_and_replace(link->dev, device);
1393
1394         if (link->dhcp_client) {
1395                 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1396                 if (r < 0)
1397                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1398         }
1399
1400         if (link->dhcp6_client) {
1401                 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1402                 if (r < 0)
1403                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1404         }
1405
1406         r = link_set_sr_iov_ifindices(link);
1407         if (r < 0)
1408                 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1409
1410         if (link->state != LINK_STATE_PENDING)
1411                 return link_reconfigure(link, /* force = */ false);
1412
1413         log_link_debug(link, "udev initialized link");
1414
1415         /* udev has initialized the link, but we don't know if we have yet
1416          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1417          * when it returns we know that the pending NEWLINKs have already been
1418          * processed and that we are up-to-date */
1419
1420         return link_call_getlink(link, link_initialized_handler);
1421 }
1422
1423 static int link_check_initialized(Link *link) {
1424         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1425         int r;
1426
1427         assert(link);
1428
1429         if (!udev_available())
1430                 return link_initialized_and_synced(link);
1431
1432         /* udev should be around */
1433         r = sd_device_new_from_ifindex(&device, link->ifindex);
1434         if (r < 0) {
1435                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1436                 return 0;
1437         }
1438
1439         r = sd_device_get_is_initialized(device);
1440         if (r < 0)
1441                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1442         if (r == 0) {
1443                 /* not yet ready */
1444                 log_link_debug(link, "link pending udev initialization...");
1445                 return 0;
1446         }
1447
1448         r = device_is_renaming(device);
1449         if (r < 0)
1450                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1451         if (r > 0) {
1452                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1453                 return 0;
1454         }
1455
1456         return link_initialized(link, device);
1457 }
1458
1459 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1460         int r, ifindex;
1461         Link *link;
1462
1463         assert(m);
1464         assert(device);
1465
1466         r = sd_device_get_ifindex(device, &ifindex);
1467         if (r < 0)
1468                 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1469
1470         r = link_get_by_index(m, ifindex, &link);
1471         if (r < 0) {
1472                 /* This error is not critical, as the corresponding rtnl message may be received later. */
1473                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1474                 return 0;
1475         }
1476
1477         /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1478          * object here. It will be removed only when rtnetlink says so. */
1479         if (action == SD_DEVICE_REMOVE) {
1480                 link->dev = sd_device_unref(link->dev);
1481                 return 0;
1482         }
1483
1484         r = device_is_renaming(device);
1485         if (r < 0)
1486                 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1487         if (r > 0) {
1488                 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1489                 /* TODO:
1490                  * What happens when a device is initialized, then soon renamed after that? When we detect
1491                  * such, maybe we should cancel or postpone all queued requests for the interface. */
1492                 return 0;
1493         }
1494
1495         r = link_initialized(link, device);
1496         if (r < 0)
1497                 link_enter_failed(link);
1498
1499         return 0;
1500 }
1501
1502 static int link_carrier_gained(Link *link) {
1503         bool force_reconfigure;
1504         int r;
1505
1506         assert(link);
1507
1508         r = event_source_disable(link->carrier_lost_timer);
1509         if (r < 0)
1510                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1511
1512         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1513          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1514          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1515          * restarted, and the correct network information will be gained.
1516          *
1517          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1518          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1519          * already assigned to the interface (in that case, the .network file does not have the SSID=
1520          * setting in the [Match] section), and the interface is already being configured. Of course,
1521          * there may exist another .network file with higher priority and a matching SSID= setting. But
1522          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1523          *
1524          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1525          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1526         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1527         link->previous_ssid = mfree(link->previous_ssid);
1528
1529         /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1530          * profile wants to match on it with SSID= in its [Match] section.
1531          */
1532         if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1533                 r = link_get_wlan_interface(link);
1534                 if (r < 0)
1535                         return r;
1536         }
1537
1538         /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1539          * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1540          * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1541         r = link_reconfigure_impl(link, force_reconfigure);
1542         if (r != 0)
1543                 return r;
1544
1545         r = link_handle_bound_by_list(link);
1546         if (r < 0)
1547                 return r;
1548
1549         if (link->iftype == ARPHRD_CAN)
1550                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1551                 return 0;
1552
1553         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1554                 r = link_acquire_dynamic_conf(link);
1555                 if (r < 0)
1556                         return r;
1557
1558                 r = link_request_static_configs(link);
1559                 if (r < 0)
1560                         return r;
1561         }
1562
1563         return 0;
1564 }
1565
1566 static int link_carrier_lost_impl(Link *link) {
1567         int r, ret = 0;
1568
1569         assert(link);
1570
1571         link->previous_ssid = mfree(link->previous_ssid);
1572
1573         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1574                 return 0;
1575
1576         if (!link->network)
1577                 return 0;
1578
1579         r = link_stop_engines(link, false);
1580         if (r < 0)
1581                 ret = r;
1582
1583         r = link_drop_managed_config(link);
1584         if (r < 0 && ret >= 0)
1585                 ret = r;
1586
1587         return ret;
1588 }
1589
1590 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1591         Link *link = ASSERT_PTR(userdata);
1592         int r;
1593
1594         r = link_carrier_lost_impl(link);
1595         if (r < 0) {
1596                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1597                 link_enter_failed(link);
1598         }
1599
1600         return 0;
1601 }
1602
1603 static int link_carrier_lost(Link *link) {
1604         uint16_t dhcp_mtu;
1605         usec_t usec;
1606         int r;
1607
1608         assert(link);
1609
1610         r = link_handle_bound_by_list(link);
1611         if (r < 0)
1612                 return r;
1613
1614         if (link->iftype == ARPHRD_CAN)
1615                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1616                 return 0;
1617
1618         if (!link->network)
1619                 return 0;
1620
1621         if (link->network->ignore_carrier_loss_set)
1622                 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1623                 usec = link->network->ignore_carrier_loss_usec;
1624
1625         else if (link->network->bond && link->wlan_iftype > 0)
1626                 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1627                  * carrier to be lost. See #19832. */
1628                 usec = 3 * USEC_PER_SEC;
1629
1630         else if (link->network->dhcp_use_mtu &&
1631                  link->dhcp_lease &&
1632                  sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1633                  dhcp_mtu != link->original_mtu)
1634                 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1635                  * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1636                  * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1637                 usec = 5 * USEC_PER_SEC;
1638
1639         else
1640                 /* Otherwise, use the currently set value. */
1641                 usec = link->network->ignore_carrier_loss_usec;
1642
1643         if (usec == USEC_INFINITY)
1644                 return 0;
1645
1646         if (usec == 0)
1647                 return link_carrier_lost_impl(link);
1648
1649         return event_reset_time_relative(link->manager->event,
1650                                          &link->carrier_lost_timer,
1651                                          CLOCK_BOOTTIME,
1652                                          usec,
1653                                          0,
1654                                          link_carrier_lost_handler,
1655                                          link,
1656                                          0,
1657                                          "link-carrier-loss",
1658                                          true);
1659 }
1660
1661 static int link_admin_state_up(Link *link) {
1662         int r;
1663
1664         assert(link);
1665
1666         /* This is called every time an interface admin state changes to up;
1667          * specifically, when IFF_UP flag changes from unset to set. */
1668
1669         if (!link->network)
1670                 return 0;
1671
1672         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1673                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1674                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1675         }
1676
1677         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1678          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1679         r = link_set_ipv6_mtu(link);
1680         if (r < 0)
1681                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1682
1683         return 0;
1684 }
1685
1686 static int link_admin_state_down(Link *link) {
1687         assert(link);
1688
1689         if (!link->network)
1690                 return 0;
1691
1692         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1693                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1694                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1695         }
1696
1697         return 0;
1698 }
1699
1700 static bool link_is_enslaved(Link *link) {
1701         if (link->flags & IFF_SLAVE)
1702                 return true;
1703
1704         if (link->master_ifindex > 0)
1705                 return true;
1706
1707         return false;
1708 }
1709
1710 static LinkAddressState address_state_from_scope(uint8_t scope) {
1711         if (scope < RT_SCOPE_SITE)
1712                 /* universally accessible addresses found */
1713                 return LINK_ADDRESS_STATE_ROUTABLE;
1714
1715         if (scope < RT_SCOPE_HOST)
1716                 /* only link or site local addresses found */
1717                 return LINK_ADDRESS_STATE_DEGRADED;
1718
1719         /* no useful addresses found */
1720         return LINK_ADDRESS_STATE_OFF;
1721 }
1722
1723 void link_update_operstate(Link *link, bool also_update_master) {
1724         LinkOperationalState operstate;
1725         LinkCarrierState carrier_state;
1726         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1727         LinkOnlineState online_state;
1728         _cleanup_strv_free_ char **p = NULL;
1729         uint8_t ipv4_scope = RT_SCOPE_NOWHERE, ipv6_scope = RT_SCOPE_NOWHERE;
1730         bool changed = false;
1731         Address *address;
1732
1733         assert(link);
1734
1735         if (link->kernel_operstate == IF_OPER_DORMANT)
1736                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1737         else if (link_has_carrier(link)) {
1738                 if (link_is_enslaved(link))
1739                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1740                 else
1741                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1742         } else if (link->flags & IFF_UP)
1743                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1744         else
1745                 carrier_state = LINK_CARRIER_STATE_OFF;
1746
1747         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1748                 Link *slave;
1749
1750                 SET_FOREACH(slave, link->slaves) {
1751                         link_update_operstate(slave, false);
1752
1753                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1754                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1755                 }
1756         }
1757
1758         SET_FOREACH(address, link->addresses) {
1759                 if (!address_is_ready(address))
1760                         continue;
1761
1762                 if (address->family == AF_INET)
1763                         ipv4_scope = MIN(ipv4_scope, address->scope);
1764
1765                 if (address->family == AF_INET6)
1766                         ipv6_scope = MIN(ipv6_scope, address->scope);
1767         }
1768
1769         ipv4_address_state = address_state_from_scope(ipv4_scope);
1770         ipv6_address_state = address_state_from_scope(ipv6_scope);
1771         address_state = address_state_from_scope(MIN(ipv4_scope, ipv6_scope));
1772
1773         /* Mapping of address and carrier state vs operational state
1774          *                                                     carrier state
1775          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1776          *                 ------------------------------------------------------------------------------
1777          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1778          * address_state   degraded | off | no-carrier | dormant | degraded         | degraded | enslaved
1779          *                 routable | off | no-carrier | dormant | routable         | routable | routable
1780          */
1781
1782         if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1783                 operstate = LINK_OPERSTATE_ROUTABLE;
1784         else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1785                 operstate = LINK_OPERSTATE_DEGRADED;
1786         else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1787                 operstate = (LinkOperationalState) carrier_state;
1788         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1789                 operstate = LINK_OPERSTATE_ROUTABLE;
1790         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1791                 operstate = LINK_OPERSTATE_DEGRADED;
1792         else
1793                 operstate = LINK_OPERSTATE_ENSLAVED;
1794
1795         /* Only determine online state for managed links with RequiredForOnline=yes */
1796         if (!link->network || !link->network->required_for_online)
1797                 online_state = _LINK_ONLINE_STATE_INVALID;
1798         else if (operstate < link->network->required_operstate_for_online.min ||
1799                  operstate > link->network->required_operstate_for_online.max)
1800                 online_state = LINK_ONLINE_STATE_OFFLINE;
1801         else {
1802                 AddressFamily required_family = link->network->required_family_for_online;
1803                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1804                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1805
1806                 /* The operational state is within the range required for online.
1807                  * If a particular address family is also required, we might revert
1808                  * to offline in the blocks below. */
1809                 online_state = LINK_ONLINE_STATE_ONLINE;
1810
1811                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_DEGRADED) {
1812                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1813                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1814                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1815                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1816                 }
1817
1818                 if (link->network->required_operstate_for_online.min >= LINK_OPERSTATE_ROUTABLE) {
1819                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1820                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1821                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1822                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1823                 }
1824         }
1825
1826         if (link->carrier_state != carrier_state) {
1827                 link->carrier_state = carrier_state;
1828                 changed = true;
1829                 if (strv_extend(&p, "CarrierState") < 0)
1830                         log_oom();
1831         }
1832
1833         if (link->address_state != address_state) {
1834                 link->address_state = address_state;
1835                 changed = true;
1836                 if (strv_extend(&p, "AddressState") < 0)
1837                         log_oom();
1838         }
1839
1840         if (link->ipv4_address_state != ipv4_address_state) {
1841                 link->ipv4_address_state = ipv4_address_state;
1842                 changed = true;
1843                 if (strv_extend(&p, "IPv4AddressState") < 0)
1844                         log_oom();
1845         }
1846
1847         if (link->ipv6_address_state != ipv6_address_state) {
1848                 link->ipv6_address_state = ipv6_address_state;
1849                 changed = true;
1850                 if (strv_extend(&p, "IPv6AddressState") < 0)
1851                         log_oom();
1852         }
1853
1854         if (link->operstate != operstate) {
1855                 link->operstate = operstate;
1856                 changed = true;
1857                 if (strv_extend(&p, "OperationalState") < 0)
1858                         log_oom();
1859         }
1860
1861         if (link->online_state != online_state) {
1862                 link->online_state = online_state;
1863                 changed = true;
1864                 if (strv_extend(&p, "OnlineState") < 0)
1865                         log_oom();
1866         }
1867
1868         if (p)
1869                 link_send_changed_strv(link, p);
1870         if (changed)
1871                 link_dirty(link);
1872
1873         if (also_update_master) {
1874                 Link *master;
1875
1876                 if (link_get_master(link, &master) >= 0)
1877                         link_update_operstate(master, true);
1878         }
1879 }
1880
1881 #define FLAG_STRING(string, flag, old, new)                      \
1882         (((old ^ new) & flag)                                    \
1883          ? ((old & flag) ? (" -" string) : (" +" string))        \
1884          : "")
1885
1886 static int link_update_flags(Link *link, sd_netlink_message *message) {
1887         bool link_was_admin_up, had_carrier;
1888         uint8_t operstate;
1889         unsigned flags;
1890         int r;
1891
1892         assert(link);
1893         assert(message);
1894
1895         r = sd_rtnl_message_link_get_flags(message, &flags);
1896         if (r < 0)
1897                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1898
1899         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1900         if (r == -ENODATA)
1901                 /* If we got a message without operstate, assume the state was unchanged. */
1902                 operstate = link->kernel_operstate;
1903         else if (r < 0)
1904                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1905
1906         if (link->flags == flags && link->kernel_operstate == operstate)
1907                 return 0;
1908
1909         if (link->flags != flags) {
1910                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1911
1912                 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",
1913                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1914                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1915                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1916                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
1917                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1918                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1919                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1920                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1921                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1922                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1923                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1924                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1925                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1926                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1927                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
1928                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
1929                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
1930                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
1931                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
1932
1933                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
1934                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
1935                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
1936                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
1937                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
1938                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
1939                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
1940                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
1941
1942                 if (unknown_flags_added)
1943                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
1944
1945                 if (unknown_flags_removed)
1946                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
1947         }
1948
1949         link_was_admin_up = link->flags & IFF_UP;
1950         had_carrier = link_has_carrier(link);
1951
1952         link->flags = flags;
1953         link->kernel_operstate = operstate;
1954
1955         link_update_operstate(link, true);
1956
1957         if (!link_was_admin_up && (link->flags & IFF_UP)) {
1958                 log_link_info(link, "Link UP");
1959
1960                 r = link_admin_state_up(link);
1961                 if (r < 0)
1962                         return r;
1963         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
1964                 log_link_info(link, "Link DOWN");
1965
1966                 r = link_admin_state_down(link);
1967                 if (r < 0)
1968                         return r;
1969         }
1970
1971         if (!had_carrier && link_has_carrier(link)) {
1972                 log_link_info(link, "Gained carrier");
1973
1974                 r = link_carrier_gained(link);
1975                 if (r < 0)
1976                         return r;
1977         } else if (had_carrier && !link_has_carrier(link)) {
1978                 log_link_info(link, "Lost carrier");
1979
1980                 r = link_carrier_lost(link);
1981                 if (r < 0)
1982                         return r;
1983         }
1984
1985         return 0;
1986 }
1987
1988 static int link_update_master(Link *link, sd_netlink_message *message) {
1989         int master_ifindex, r;
1990
1991         assert(link);
1992         assert(message);
1993
1994         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
1995         if (r == -ENODATA)
1996                 return 0;
1997         if (r < 0)
1998                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
1999
2000         if (master_ifindex == link->ifindex)
2001                 master_ifindex = 0;
2002
2003         if (master_ifindex == link->master_ifindex)
2004                 return 0;
2005
2006         if (link->master_ifindex == 0)
2007                 log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2008         else if (master_ifindex == 0)
2009                 log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2010         else
2011                 log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2012                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2013
2014         link_drop_from_master(link);
2015
2016         link->master_ifindex = master_ifindex;
2017
2018         r = link_append_to_master(link);
2019         if (r < 0)
2020                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2021
2022         return 0;
2023 }
2024
2025 static int link_update_driver(Link *link, sd_netlink_message *message) {
2026         int r;
2027
2028         assert(link);
2029         assert(link->manager);
2030         assert(message);
2031
2032         /* Driver is already read. Assuming the driver is never changed. */
2033         if (link->ethtool_driver_read)
2034                 return 0;
2035
2036         /* When udevd is running, read the driver after the interface is initialized by udevd.
2037          * Otherwise, ethtool may not work correctly. See issue #22538.
2038          * When udevd is not running, read the value when the interface is detected. */
2039         if (udev_available() && !link->dev)
2040                 return 0;
2041
2042         link->ethtool_driver_read = true;
2043
2044         r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2045         if (r < 0) {
2046                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2047                 return 0;
2048         }
2049
2050         log_link_debug(link, "Found driver: %s", strna(link->driver));
2051
2052         if (streq_ptr(link->driver, "dsa")) {
2053                 uint32_t dsa_master_ifindex = 0;
2054
2055                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2056                 if (r < 0 && r != -ENODATA)
2057                         return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2058
2059                 if (dsa_master_ifindex > INT_MAX) {
2060                         log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2061                                        dsa_master_ifindex);
2062                         dsa_master_ifindex = 0;
2063                 }
2064
2065                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2066         }
2067
2068         return 1; /* needs reconfigure */
2069 }
2070
2071 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2072         int r;
2073
2074         assert(link);
2075         assert(link->manager);
2076         assert(message);
2077
2078         if (link->ethtool_permanent_hw_addr_read)
2079                 return 0;
2080
2081         /* When udevd is running, read the permanent hardware address after the interface is
2082          * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2083          * When udevd is not running, read the value when the interface is detected. */
2084         if (udev_available() && !link->dev)
2085                 return 0;
2086
2087         /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2088         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2089         if (r == -ENODATA)
2090                 return 0;
2091         if (r < 0)
2092                 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2093
2094         link->ethtool_permanent_hw_addr_read = true;
2095
2096         r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2097         if (r < 0)
2098                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2099
2100         return 0;
2101 }
2102
2103 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2104         int r;
2105
2106         assert(link);
2107         assert(link->manager);
2108         assert(message);
2109
2110         if (link->permanent_hw_addr.length > 0)
2111                 return 0;
2112
2113         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2114         if (r < 0) {
2115                 if (r != -ENODATA)
2116                         return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2117
2118                 /* Fallback to ethtool for older kernels. */
2119                 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2120                 if (r < 0)
2121                         return r;
2122         }
2123
2124         if (link->permanent_hw_addr.length > 0)
2125                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2126
2127         return 1; /* needs reconfigure */
2128 }
2129
2130 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2131         struct hw_addr_data addr;
2132         int r;
2133
2134         assert(link);
2135         assert(message);
2136
2137         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2138         if (r < 0 && r != -ENODATA)
2139                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2140
2141         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2142         if (r == -ENODATA)
2143                 return 0;
2144         if (r < 0)
2145                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2146
2147         if (hw_addr_equal(&link->hw_addr, &addr))
2148                 return 0;
2149
2150         if (link->hw_addr.length == 0)
2151                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2152         else {
2153                 log_link_debug(link, "Hardware address is changed: %s %s %s",
2154                                HW_ADDR_TO_STR(&link->hw_addr),
2155                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2156                                HW_ADDR_TO_STR(&addr));
2157
2158                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2159         }
2160
2161         link->hw_addr = addr;
2162
2163         if (!hw_addr_is_null(&link->hw_addr)) {
2164                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2165                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2166                         /* bonding master and its slaves have the same hardware address. */
2167                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2168                 if (r < 0)
2169                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2170         }
2171
2172         r = ipv4acd_update_mac(link);
2173         if (r < 0)
2174                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2175
2176         r = ipv4ll_update_mac(link);
2177         if (r < 0)
2178                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2179
2180         r = dhcp4_update_mac(link);
2181         if (r < 0)
2182                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2183
2184         r = dhcp6_update_mac(link);
2185         if (r < 0)
2186                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2187
2188         r = radv_update_mac(link);
2189         if (r < 0)
2190                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2191
2192         if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2193                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2194                 if (r < 0)
2195                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2196         }
2197
2198         if (link->lldp_rx) {
2199                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2200                 if (r < 0)
2201                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2202         }
2203
2204         if (link->lldp_tx) {
2205                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2206                 if (r < 0)
2207                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2208         }
2209
2210         return 1; /* needs reconfigure */
2211 }
2212
2213 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2214         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2215         int r;
2216
2217         assert(link);
2218         assert(message);
2219
2220         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2221         if (r == -ENODATA)
2222                 return 0;
2223         if (r < 0)
2224                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2225         if (mtu == 0)
2226                 return 0;
2227
2228         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2229         if (r < 0 && r != -ENODATA)
2230                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2231
2232         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2233         if (r < 0 && r != -ENODATA)
2234                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2235
2236         if (max_mtu == 0)
2237                 max_mtu = UINT32_MAX;
2238
2239         link->min_mtu = min_mtu;
2240         link->max_mtu = max_mtu;
2241
2242         if (link->original_mtu == 0) {
2243                 link->original_mtu = mtu;
2244                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2245                                link->original_mtu, link->min_mtu, link->max_mtu);
2246         }
2247
2248         if (link->mtu == mtu)
2249                 return 0;
2250
2251         if (link->mtu != 0)
2252                 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2253                                link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2254                                link->min_mtu, link->max_mtu);
2255
2256         link->mtu = mtu;
2257
2258         if (link->dhcp_client) {
2259                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2260                 if (r < 0)
2261                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2262         }
2263
2264         if (link->radv) {
2265                 r = sd_radv_set_mtu(link->radv, link->mtu);
2266                 if (r < 0)
2267                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2268         }
2269
2270         return 0;
2271 }
2272
2273 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2274         _cleanup_strv_free_ char **altnames = NULL;
2275         int r;
2276
2277         assert(link);
2278         assert(message);
2279
2280         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2281         if (r == -ENODATA)
2282                 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2283                  * interface has no alternative name. */
2284                 return 0;
2285         if (r < 0)
2286                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2287
2288         if (strv_equal(altnames, link->alternative_names))
2289                 return 0;
2290
2291         STRV_FOREACH(n, link->alternative_names)
2292                 hashmap_remove(link->manager->links_by_name, *n);
2293
2294         strv_free_and_replace(link->alternative_names, altnames);
2295
2296         STRV_FOREACH(n, link->alternative_names) {
2297                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2298                 if (r < 0)
2299                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2300         }
2301
2302         return 1; /* needs reconfigure */
2303 }
2304
2305 static int link_update_name(Link *link, sd_netlink_message *message) {
2306         char ifname_from_index[IF_NAMESIZE];
2307         const char *ifname;
2308         int r;
2309
2310         assert(link);
2311         assert(message);
2312
2313         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2314         if (r == -ENODATA)
2315                 /* Hmm?? But ok. */
2316                 return 0;
2317         if (r < 0)
2318                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2319
2320         if (streq(ifname, link->ifname))
2321                 return 0;
2322
2323         r = format_ifname(link->ifindex, ifname_from_index);
2324         if (r < 0)
2325                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2326
2327         if (!streq(ifname, ifname_from_index)) {
2328                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2329                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2330                                ifname, ifname_from_index);
2331                 return 0;
2332         }
2333
2334         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2335
2336         hashmap_remove(link->manager->links_by_name, link->ifname);
2337
2338         r = free_and_strdup(&link->ifname, ifname);
2339         if (r < 0)
2340                 return log_oom_debug();
2341
2342         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2343         if (r < 0)
2344                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2345
2346         if (link->dhcp_client) {
2347                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2348                 if (r < 0)
2349                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2350         }
2351
2352         if (link->dhcp6_client) {
2353                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2354                 if (r < 0)
2355                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2356         }
2357
2358         if (link->ndisc) {
2359                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2360                 if (r < 0)
2361                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2362         }
2363
2364         if (link->dhcp_server) {
2365                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2366                 if (r < 0)
2367                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2368         }
2369
2370         if (link->radv) {
2371                 r = sd_radv_set_ifname(link->radv, link->ifname);
2372                 if (r < 0)
2373                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2374         }
2375
2376         if (link->lldp_rx) {
2377                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2378                 if (r < 0)
2379                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2380         }
2381
2382         if (link->lldp_tx) {
2383                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2384                 if (r < 0)
2385                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2386         }
2387
2388         if (link->ipv4ll) {
2389                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2390                 if (r < 0)
2391                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2392         }
2393
2394         r = ipv4acd_set_ifname(link);
2395         if (r < 0)
2396                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2397
2398         return 1; /* needs reconfigure */
2399 }
2400
2401 static int link_update(Link *link, sd_netlink_message *message) {
2402         bool needs_reconfigure = false;
2403         int r;
2404
2405         assert(link);
2406         assert(message);
2407
2408         r = link_update_name(link, message);
2409         if (r < 0)
2410                 return r;
2411         needs_reconfigure = needs_reconfigure || r > 0;
2412
2413         r = link_update_alternative_names(link, message);
2414         if (r < 0)
2415                 return r;
2416         needs_reconfigure = needs_reconfigure || r > 0;
2417
2418         r = link_update_mtu(link, message);
2419         if (r < 0)
2420                 return r;
2421
2422         r = link_update_driver(link, message);
2423         if (r < 0)
2424                 return r;
2425         needs_reconfigure = needs_reconfigure || r > 0;
2426
2427         r = link_update_permanent_hardware_address(link, message);
2428         if (r < 0)
2429                 return r;
2430         needs_reconfigure = needs_reconfigure || r > 0;
2431
2432         r = link_update_hardware_address(link, message);
2433         if (r < 0)
2434                 return r;
2435         needs_reconfigure = needs_reconfigure || r > 0;
2436
2437         r = link_update_master(link, message);
2438         if (r < 0)
2439                 return r;
2440
2441         r = link_update_ipv6ll_addrgen_mode(link, message);
2442         if (r < 0)
2443                 return r;
2444
2445         r = link_update_flags(link, message);
2446         if (r < 0)
2447                 return r;
2448
2449         return needs_reconfigure;
2450 }
2451
2452 static Link *link_drop_or_unref(Link *link) {
2453         if (!link)
2454                 return NULL;
2455         if (!link->manager)
2456                 return link_unref(link);
2457         return link_drop(link);
2458 }
2459
2460 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2461
2462 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2463         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2464         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2465         unsigned short iftype;
2466         int r, ifindex;
2467
2468         assert(manager);
2469         assert(message);
2470         assert(ret);
2471
2472         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2473         if (r < 0)
2474                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2475         else if (ifindex <= 0)
2476                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2477
2478         r = sd_rtnl_message_link_get_type(message, &iftype);
2479         if (r < 0)
2480                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2481
2482         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2483         if (r < 0)
2484                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2485
2486         /* check for link kind */
2487         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2488         if (r >= 0) {
2489                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2490                 if (r < 0 && r != -ENODATA)
2491                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2492                 r = sd_netlink_message_exit_container(message);
2493                 if (r < 0)
2494                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2495         }
2496
2497         if (!manager->test_mode) {
2498                 /* Do not update state files when running in test mode. */
2499                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2500                         return log_oom_debug();
2501
2502                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2503                         return log_oom_debug();
2504
2505                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2506                         return log_oom_debug();
2507         }
2508
2509         link = new(Link, 1);
2510         if (!link)
2511                 return -ENOMEM;
2512
2513         *link = (Link) {
2514                 .n_ref = 1,
2515                 .state = LINK_STATE_PENDING,
2516                 .online_state = _LINK_ONLINE_STATE_INVALID,
2517                 .ifindex = ifindex,
2518                 .iftype = iftype,
2519                 .ifname = TAKE_PTR(ifname),
2520                 .kind = TAKE_PTR(kind),
2521
2522                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2523
2524                 .state_file = TAKE_PTR(state_file),
2525                 .lease_file = TAKE_PTR(lease_file),
2526                 .lldp_file = TAKE_PTR(lldp_file),
2527
2528                 .n_dns = UINT_MAX,
2529                 .dns_default_route = -1,
2530                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2531                 .mdns = _RESOLVE_SUPPORT_INVALID,
2532                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2533                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2534         };
2535
2536         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2537         if (r < 0)
2538                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2539
2540         link->manager = manager;
2541
2542         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2543         if (r < 0)
2544                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2545
2546         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2547                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2548
2549         /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2550          * message arrived too early. Request the wireless link information again.
2551          */
2552         if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2553                 r = link_get_wlan_interface(link);
2554                 if (r < 0)
2555                         log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2556         }
2557
2558         *ret = TAKE_PTR(link);
2559         return 0;
2560 }
2561
2562 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2563         Link *link = NULL;
2564         NetDev *netdev = NULL;
2565         uint16_t type;
2566         const char *name;
2567         int r, ifindex;
2568
2569         assert(rtnl);
2570         assert(message);
2571         assert(manager);
2572
2573         if (sd_netlink_message_is_error(message)) {
2574                 r = sd_netlink_message_get_errno(message);
2575                 if (r < 0)
2576                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2577
2578                 return 0;
2579         }
2580
2581         r = sd_netlink_message_get_type(message, &type);
2582         if (r < 0) {
2583                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2584                 return 0;
2585         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2586                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2587                 return 0;
2588         }
2589
2590         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2591         if (r < 0) {
2592                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2593                 return 0;
2594         } else if (ifindex <= 0) {
2595                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2596                 return 0;
2597         }
2598
2599         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2600         if (r < 0) {
2601                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2602                 return 0;
2603         }
2604
2605         (void) link_get_by_index(manager, ifindex, &link);
2606         (void) netdev_get(manager, name, &netdev);
2607
2608         switch (type) {
2609         case RTM_NEWLINK:
2610                 if (netdev) {
2611                         /* netdev exists, so make sure the ifindex matches */
2612                         r = netdev_set_ifindex(netdev, message);
2613                         if (r < 0) {
2614                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2615                                 return 0;
2616                         }
2617                 }
2618
2619                 if (!link) {
2620                         /* link is new, so add it */
2621                         r = link_new(manager, message, &link);
2622                         if (r < 0) {
2623                                 log_warning_errno(r, "Could not process new link message: %m");
2624                                 return 0;
2625                         }
2626
2627                         r = link_update(link, message);
2628                         if (r < 0) {
2629                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2630                                 link_enter_failed(link);
2631                                 return 0;
2632                         }
2633
2634                         r = link_check_initialized(link);
2635                         if (r < 0) {
2636                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2637                                 link_enter_failed(link);
2638                                 return 0;
2639                         }
2640                 } else {
2641                         r = link_update(link, message);
2642                         if (r < 0) {
2643                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2644                                 link_enter_failed(link);
2645                                 return 0;
2646                         }
2647                         if (r > 0) {
2648                                 r = link_reconfigure_impl(link, /* force = */ false);
2649                                 if (r < 0) {
2650                                         log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2651                                         link_enter_failed(link);
2652                                         return 0;
2653                                 }
2654                         }
2655                 }
2656                 break;
2657
2658         case RTM_DELLINK:
2659                 link_drop(link);
2660                 netdev_drop(netdev);
2661                 break;
2662
2663         default:
2664                 assert_not_reached();
2665         }
2666
2667         return 1;
2668 }
2669
2670 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2671         uint16_t message_type;
2672         int r;
2673
2674         assert(m);
2675         assert(link);
2676         assert(error_msg);
2677
2678         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2679                 return 0;
2680
2681         r = sd_netlink_message_get_errno(m);
2682         if (r < 0) {
2683                 log_link_message_warning_errno(link, m, r, error_msg);
2684                 link_enter_failed(link);
2685                 return 0;
2686         }
2687
2688         r = sd_netlink_message_get_type(m, &message_type);
2689         if (r < 0) {
2690                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2691                 return 0;
2692         }
2693         if (message_type != RTM_NEWLINK) {
2694                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2695                 return 0;
2696         }
2697
2698         r = link_update(link, m);
2699         if (r < 0) {
2700                 link_enter_failed(link);
2701                 return 0;
2702         }
2703
2704         return 1;
2705 }
2706
2707 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2708         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2709         int r;
2710
2711         assert(link);
2712         assert(link->manager);
2713         assert(link->manager->rtnl);
2714         assert(callback);
2715
2716         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2717         if (r < 0)
2718                 return r;
2719
2720         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2721                                link_netlink_destroy_callback, link);
2722         if (r < 0)
2723                 return r;
2724
2725         link_ref(link);
2726         return 0;
2727 }
2728
2729 static const char* const link_state_table[_LINK_STATE_MAX] = {
2730         [LINK_STATE_PENDING]     = "pending",
2731         [LINK_STATE_INITIALIZED] = "initialized",
2732         [LINK_STATE_CONFIGURING] = "configuring",
2733         [LINK_STATE_CONFIGURED]  = "configured",
2734         [LINK_STATE_UNMANAGED]   = "unmanaged",
2735         [LINK_STATE_FAILED]      = "failed",
2736         [LINK_STATE_LINGER]      = "linger",
2737 };
2738
2739 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2740
2741 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2742         _cleanup_free_ char *str = NULL;
2743         static const char* map[] = {
2744                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2745                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid. */
2746                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2747                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2748                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2749                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2750                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2751                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2752                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2753                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2754                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2755                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2756                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast. */
2757                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2758                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2759                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2760                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2761                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2762                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2763         };
2764
2765         assert(ret);
2766
2767         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2768                 if (FLAGS_SET(flags, 1 << i) && map[i])
2769                         if (!strextend_with_separator(&str, ",", map[i]))
2770                                 return -ENOMEM;
2771
2772         *ret = TAKE_PTR(str);
2773         return 0;
2774 }
2775
2776 static const char * const kernel_operstate_table[] = {
2777         [IF_OPER_UNKNOWN]        = "unknown",
2778         [IF_OPER_NOTPRESENT]     = "not-present",
2779         [IF_OPER_DOWN]           = "down",
2780         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2781         [IF_OPER_TESTING]        = "testing",
2782         [IF_OPER_DORMANT]        = "dormant",
2783         [IF_OPER_UP]             = "up",
2784 };
2785
2786 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);