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-lease-internal.h"
  21 #include "env-file.h"
  22 #include "ethtool-util.h"
  23 #include "event-util.h"
  24 #include "fd-util.h"
  25 #include "fileio.h"
  26 #include "format-util.h"
  27 #include "fs-util.h"
  28 #include "glyph-util.h"
  29 #include "logarithm.h"
  30 #include "missing_network.h"
  31 #include "netlink-util.h"
  32 #include "network-internal.h"
  33 #include "networkd-address-label.h"
  34 #include "networkd-address.h"
  35 #include "networkd-bridge-fdb.h"
  36 #include "networkd-bridge-mdb.h"
  37 #include "networkd-bridge-vlan.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-util.h"
  56 #include "networkd-route.h"
  57 #include "networkd-routing-policy-rule.h"
  58 #include "networkd-setlink.h"
  59 #include "networkd-sriov.h"
  60 #include "networkd-state-file.h"
  61 #include "networkd-sysctl.h"
  62 #include "networkd-wifi.h"
  63 #include "set.h"
  64 #include "socket-util.h"
  65 #include "stdio-util.h"
  66 #include "string-table.h"
  67 #include "strv.h"
  68 #include "tc.h"
  69 #include "tmpfile-util.h"
  70 #include "tuntap.h"
  71 #include "udev-util.h"
  72 #include "vrf.h"
  73
  74 void link_required_operstate_for_online(Link *link, LinkOperationalStateRange *ret) {
  75         assert(link);
  76         assert(ret);
  77
  78         if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online))
  79                 /* If explicitly specified, use it as is. */
  80                 *ret = link->network->required_operstate_for_online;
  81         else if (link->iftype == ARPHRD_CAN)
  82                 /* CAN devices do not support addressing, hence defaults to 'carrier'. */
  83                 *ret = (const LinkOperationalStateRange) {
  84                         .min = LINK_OPERSTATE_CARRIER,
  85                         .max = LINK_OPERSTATE_CARRIER,
  86                 };
  87         else if (link->network && link->network->bond)
  88                 /* Bonding slaves do not support addressing. */
  89                 *ret = (const LinkOperationalStateRange) {
  90                         .min = LINK_OPERSTATE_ENSLAVED,
  91                         .max = LINK_OPERSTATE_ENSLAVED,
  92                 };
  93         else if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf"))
  94                 /* Some of slave interfaces may be offline. */
  95                 *ret = (const LinkOperationalStateRange) {
  96                         .min = LINK_OPERSTATE_DEGRADED_CARRIER,
  97                         .max = LINK_OPERSTATE_ROUTABLE,
  98                 };
  99         else
 100                 *ret = LINK_OPERSTATE_RANGE_DEFAULT;
 101 }
 102
 103 AddressFamily link_required_family_for_online(Link *link) {
 104         assert(link);
 105
 106         if (link->network && link->network->required_family_for_online >= 0)
 107                 return link->network->required_family_for_online;
 108
 109         if (link->network && operational_state_range_is_valid(&link->network->required_operstate_for_online))
 110                 /* If RequiredForOnline= is explicitly specified, defaults to no. */
 111                 return ADDRESS_FAMILY_NO;
 112
 113         if (STRPTR_IN_SET(link->kind, "batadv", "bond", "bridge", "vrf"))
 114                 /* As the minimum required operstate for master interfaces is 'degraded-carrier',
 115                  * we should request an address assigned to the link for backward compatibility. */
 116                 return ADDRESS_FAMILY_YES;
 117
 118         return ADDRESS_FAMILY_NO;
 119 }
 120
 121 bool link_ipv6_enabled(Link *link) {
 122         assert(link);
 123
 124         if (!socket_ipv6_is_supported())
 125                 return false;
 126
 127         if (link->iftype == ARPHRD_CAN)
 128                 return false;
 129
 130         if (!link->network)
 131                 return false;
 132
 133         if (link->network->bond)
 134                 return false;
 135
 136         if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
 137                 return true;
 138
 139         if (network_has_static_ipv6_configurations(link->network))
 140                 return true;
 141
 142         return false;
 143 }
 144
 145 bool link_has_ipv6_connectivity(Link *link) {
 146         LinkAddressState ipv6_address_state;
 147
 148         assert(link);
 149
 150         link_get_address_states(link, NULL, &ipv6_address_state, NULL);
 151
 152         switch (ipv6_address_state) {
 153         case LINK_ADDRESS_STATE_ROUTABLE:
 154                 /* If the interface has a routable IPv6 address, then we assume yes. */
 155                 return true;
 156
 157         case LINK_ADDRESS_STATE_DEGRADED:
 158                 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
 159                  * there is an IPv6 default gateway. */
 160                 return link_has_default_gateway(link, AF_INET6);
 161
 162         case LINK_ADDRESS_STATE_OFF:
 163                 /* No IPv6 address. */
 164                 return false;
 165
 166         default:
 167                 assert_not_reached();
 168         }
 169 }
 170
 171 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
 172         assert(link);
 173
 174         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
 175                 return false;
 176
 177         if (!link->network)
 178                 return allow_unmanaged;
 179
 180         if (!link->network->configure_without_carrier) {
 181                 if (link->set_flags_messages > 0)
 182                         return false;
 183
 184                 if (!link_has_carrier(link))
 185                         return false;
 186         }
 187
 188         if (link->set_link_messages > 0)
 189                 return false;
 190
 191         if (!link->activated)
 192                 return false;
 193
 194         return true;
 195 }
 196
 197 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
 198         return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
 199 }
 200
 201 void link_ntp_settings_clear(Link *link) {
 202         link->ntp = strv_free(link->ntp);
 203 }
 204
 205 void link_dns_settings_clear(Link *link) {
 206         if (link->n_dns != UINT_MAX)
 207                 for (unsigned i = 0; i < link->n_dns; i++)
 208                         in_addr_full_free(link->dns[i]);
 209         link->dns = mfree(link->dns);
 210         link->n_dns = UINT_MAX;
 211
 212         link->search_domains = ordered_set_free(link->search_domains);
 213         link->route_domains = ordered_set_free(link->route_domains);
 214
 215         link->dns_default_route = -1;
 216         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 217         link->mdns = _RESOLVE_SUPPORT_INVALID;
 218         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 219         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 220
 221         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 222 }
 223
 224 static void link_free_engines(Link *link) {
 225         if (!link)
 226                 return;
 227
 228         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 229
 230         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 231         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 232         link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
 233
 234         link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
 235         link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
 236
 237         link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
 238
 239         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 240
 241         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 242         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 243
 244         link->ndisc = sd_ndisc_unref(link->ndisc);
 245         link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
 246         ndisc_flush(link);
 247
 248         link->radv = sd_radv_unref(link->radv);
 249 }
 250
 251 static Link *link_free(Link *link) {
 252         assert(link);
 253
 254         link_ntp_settings_clear(link);
 255         link_dns_settings_clear(link);
 256
 257         link->neighbors = set_free(link->neighbors);
 258         link->addresses = set_free(link->addresses);
 259         link->qdiscs = set_free(link->qdiscs);
 260         link->tclasses = set_free(link->tclasses);
 261
 262         link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
 263
 264         link_free_engines(link);
 265
 266         set_free(link->sr_iov_virt_port_ifindices);
 267         free(link->ifname);
 268         strv_free(link->alternative_names);
 269         free(link->kind);
 270         free(link->ssid);
 271         free(link->previous_ssid);
 272         free(link->driver);
 273
 274         unlink_and_free(link->lease_file);
 275         unlink_and_free(link->lldp_file);
 276         unlink_and_free(link->state_file);
 277
 278         sd_device_unref(link->dev);
 279         netdev_unref(link->netdev);
 280
 281         hashmap_free(link->bound_to_links);
 282         hashmap_free(link->bound_by_links);
 283
 284         set_free_with_destructor(link->slaves, link_unref);
 285
 286         network_unref(link->network);
 287
 288         sd_event_source_disable_unref(link->carrier_lost_timer);
 289
 290         return mfree(link);
 291 }
 292
 293 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 294
 295 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
 296         Link *link;
 297
 298         assert(m);
 299
 300         if (ifindex <= 0)
 301                 return -EINVAL;
 302
 303         link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
 304         if (!link)
 305                 return -ENODEV;
 306
 307         if (ret)
 308                 *ret = link;
 309         return 0;
 310 }
 311
 312 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
 313         Link *link;
 314
 315         assert(m);
 316         assert(ifname);
 317
 318         link = hashmap_get(m->links_by_name, ifname);
 319         if (!link)
 320                 return -ENODEV;
 321
 322         if (ret)
 323                 *ret = link;
 324         return 0;
 325 }
 326
 327 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
 328         Link *link;
 329
 330         assert(m);
 331         assert(hw_addr);
 332
 333         link = hashmap_get(m->links_by_hw_addr, hw_addr);
 334         if (!link)
 335                 return -ENODEV;
 336
 337         if (ret)
 338                 *ret = link;
 339         return 0;
 340 }
 341
 342 int link_get_master(Link *link, Link **ret) {
 343         assert(link);
 344         assert(link->manager);
 345         assert(ret);
 346
 347         if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
 348                 return -ENODEV;
 349
 350         return link_get_by_index(link->manager, link->master_ifindex, ret);
 351 }
 352
 353 void link_set_state(Link *link, LinkState state) {
 354         assert(link);
 355
 356         if (link->state == state)
 357                 return;
 358
 359         log_link_debug(link, "State changed: %s -> %s",
 360                        link_state_to_string(link->state),
 361                        link_state_to_string(state));
 362
 363         link->state = state;
 364
 365         link_send_changed(link, "AdministrativeState", NULL);
 366         link_dirty(link);
 367 }
 368
 369 int link_stop_engines(Link *link, bool may_keep_dhcp) {
 370         int r, ret = 0;
 371
 372         assert(link);
 373         assert(link->manager);
 374         assert(link->manager->event);
 375
 376         bool keep_dhcp = may_keep_dhcp &&
 377                          link->network &&
 378                          !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
 379                          (link->manager->restarting ||
 380                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 381
 382         if (!keep_dhcp) {
 383                 r = sd_dhcp_client_stop(link->dhcp_client);
 384                 if (r < 0)
 385                         RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
 386         }
 387
 388         r = sd_dhcp_server_stop(link->dhcp_server);
 389         if (r < 0)
 390                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
 391
 392         r = sd_lldp_rx_stop(link->lldp_rx);
 393         if (r < 0)
 394                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
 395
 396         r = sd_lldp_tx_stop(link->lldp_tx);
 397         if (r < 0)
 398                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
 399
 400         r = sd_ipv4ll_stop(link->ipv4ll);
 401         if (r < 0)
 402                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
 403
 404         r = ipv4acd_stop(link);
 405         if (r < 0)
 406                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
 407
 408         r = sd_dhcp6_client_stop(link->dhcp6_client);
 409         if (r < 0)
 410                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
 411
 412         r = dhcp_pd_remove(link, /* only_marked = */ false);
 413         if (r < 0)
 414                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
 415
 416         r = ndisc_stop(link);
 417         if (r < 0)
 418                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
 419
 420         ndisc_flush(link);
 421
 422         r = sd_radv_stop(link->radv);
 423         if (r < 0)
 424                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
 425
 426         return ret;
 427 }
 428
 429 void link_enter_failed(Link *link) {
 430         int r;
 431
 432         assert(link);
 433
 434         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 435                 return;
 436
 437         log_link_warning(link, "Failed");
 438
 439         link_set_state(link, LINK_STATE_FAILED);
 440
 441         if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
 442                 log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
 443                 goto stop;
 444         }
 445
 446         log_link_info(link, "Trying to reconfigure the interface.");
 447         r = link_reconfigure(link, /* force = */ true);
 448         if (r < 0) {
 449                 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
 450                 goto stop;
 451         }
 452
 453         return;
 454
 455 stop:
 456         (void) link_stop_engines(link, /* may_keep_dhcp = */ false);
 457 }
 458
 459 void link_check_ready(Link *link) {
 460         Address *a;
 461
 462         assert(link);
 463
 464         if (link->state == LINK_STATE_CONFIGURED)
 465                 return;
 466
 467         if (link->state != LINK_STATE_CONFIGURING)
 468                 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
 469
 470         if (!link->network)
 471                 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
 472
 473         if (!link->tc_configured)
 474                 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
 475
 476         if (link->set_link_messages > 0)
 477                 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
 478
 479         if (!link->activated)
 480                 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
 481
 482         if (link->iftype == ARPHRD_CAN)
 483                 /* let's shortcut things for CAN which doesn't need most of checks below. */
 484                 goto ready;
 485
 486         if (!link->stacked_netdevs_created)
 487                 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
 488
 489         if (!link->static_addresses_configured)
 490                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 491
 492         if (!link->static_address_labels_configured)
 493                 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
 494
 495         if (!link->static_bridge_fdb_configured)
 496                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 497
 498         if (!link->static_bridge_mdb_configured)
 499                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 500
 501         if (!link->static_ipv6_proxy_ndp_configured)
 502                 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
 503
 504         if (!link->static_neighbors_configured)
 505                 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
 506
 507         if (!link->static_nexthops_configured)
 508                 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
 509
 510         if (!link->static_routes_configured)
 511                 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
 512
 513         if (!link->static_routing_policy_rules_configured)
 514                 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
 515
 516         if (!link->sr_iov_configured)
 517                 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
 518
 519         /* IPv6LL is assigned after the link gains its carrier. */
 520         if (!link->network->configure_without_carrier &&
 521             link_ipv6ll_enabled(link) &&
 522             !in6_addr_is_set(&link->ipv6ll_address))
 523                 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
 524
 525         /* All static addresses must be ready. */
 526         bool has_static_address = false;
 527         SET_FOREACH(a, link->addresses) {
 528                 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
 529                         continue;
 530                 if (!address_is_ready(a))
 531                         return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
 532                                                      IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
 533                 has_static_address = true;
 534         }
 535
 536         /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
 537         if (has_static_address)
 538                 goto ready;
 539
 540         /* If no dynamic addressing protocol enabled, assume the interface is ready.
 541          * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
 542         if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
 543             !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
 544             (link->network->configure_without_carrier || !link_ndisc_enabled(link)))
 545                 goto ready;
 546
 547         bool ipv4ll_ready =
 548                 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
 549                 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
 550         bool dhcp4_ready =
 551                 link_dhcp4_enabled(link) && link->dhcp4_configured &&
 552                 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
 553         bool dhcp6_ready =
 554                 link_dhcp6_enabled(link) && link->dhcp6_configured &&
 555                 (!link->network->dhcp6_use_address ||
 556                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
 557         bool dhcp_pd_ready =
 558                 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
 559                 (!link->network->dhcp_pd_assign ||
 560                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
 561         bool ndisc_ready =
 562                 link_ndisc_enabled(link) && link->ndisc_configured &&
 563                 (!link->network->ndisc_use_autonomous_prefix ||
 564                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
 565
 566         /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
 567         if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
 568                 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
 569                     sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
 570                         if (!link->dhcp4_configured)
 571                                 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
 572                         if (!dhcp_pd_ready)
 573                                 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
 574                 }
 575
 576                 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
 577                     sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
 578                         if (!link->dhcp6_configured)
 579                                 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
 580                         if (!dhcp_pd_ready)
 581                                 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
 582                 }
 583         }
 584
 585         /* At least one dynamic addressing protocol is finished. */
 586         if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
 587                 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
 588
 589         log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
 590                        __func__,
 591                        yes_no(ipv4ll_ready),
 592                        yes_no(dhcp4_ready),
 593                        yes_no(dhcp6_ready),
 594                        yes_no(dhcp_pd_ready),
 595                        yes_no(ndisc_ready));
 596
 597 ready:
 598         link_set_state(link, LINK_STATE_CONFIGURED);
 599 }
 600
 601 static int link_request_static_configs(Link *link) {
 602         int r;
 603
 604         assert(link);
 605         assert(link->network);
 606         assert(link->state != _LINK_STATE_INVALID);
 607
 608         r = link_request_static_addresses(link);
 609         if (r < 0)
 610                 return r;
 611
 612         r = link_request_static_address_labels(link);
 613         if (r < 0)
 614                 return r;
 615
 616         r = link_request_static_bridge_fdb(link);
 617         if (r < 0)
 618                 return r;
 619
 620         r = link_request_static_bridge_mdb(link);
 621         if (r < 0)
 622                 return r;
 623
 624         r = link_request_static_ipv6_proxy_ndp_addresses(link);
 625         if (r < 0)
 626                 return r;
 627
 628         r = link_request_static_neighbors(link);
 629         if (r < 0)
 630                 return r;
 631
 632         r = link_request_static_nexthops(link, false);
 633         if (r < 0)
 634                 return r;
 635
 636         r = link_request_static_routes(link, false);
 637         if (r < 0)
 638                 return r;
 639
 640         r = link_request_static_routing_policy_rules(link);
 641         if (r < 0)
 642                 return r;
 643
 644         return 0;
 645 }
 646
 647 static int link_request_stacked_netdevs(Link *link) {
 648         NetDev *netdev;
 649         int r;
 650
 651         assert(link);
 652
 653         link->stacked_netdevs_created = false;
 654
 655         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 656                 r = link_request_stacked_netdev(link, netdev);
 657                 if (r < 0)
 658                         return r;
 659         }
 660
 661         if (link->create_stacked_netdev_messages == 0) {
 662                 link->stacked_netdevs_created = true;
 663                 link_check_ready(link);
 664         }
 665
 666         return 0;
 667 }
 668
 669 static int link_acquire_dynamic_ipv6_conf(Link *link) {
 670         int r;
 671
 672         assert(link);
 673
 674         r = radv_start(link);
 675         if (r < 0)
 676                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 677
 678         r = ndisc_start(link);
 679         if (r < 0)
 680                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 681
 682         r = dhcp6_start(link);
 683         if (r < 0)
 684                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 685
 686         return 0;
 687 }
 688
 689 static int link_acquire_dynamic_ipv4_conf(Link *link) {
 690         int r;
 691
 692         assert(link);
 693         assert(link->manager);
 694         assert(link->manager->event);
 695
 696         if (link->dhcp_client) {
 697                 r = dhcp4_start(link);
 698                 if (r < 0)
 699                         return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
 700
 701                 log_link_debug(link, "Acquiring DHCPv4 lease.");
 702
 703         } else if (link->ipv4ll) {
 704                 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
 705                         r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
 706                         if (r < 0)
 707                                 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
 708                 }
 709
 710                 r = sd_ipv4ll_start(link->ipv4ll);
 711                 if (r < 0)
 712                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
 713
 714                 log_link_debug(link, "Acquiring IPv4 link-local address.");
 715         }
 716
 717         if (link->dhcp_server) {
 718                 r = sd_dhcp_server_start(link->dhcp_server);
 719                 if (r < 0)
 720                         return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
 721         }
 722
 723         r = ipv4acd_start(link);
 724         if (r < 0)
 725                 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
 726
 727         return 0;
 728 }
 729
 730 static int link_acquire_dynamic_conf(Link *link) {
 731         int r;
 732
 733         assert(link);
 734         assert(link->network);
 735
 736         r = link_acquire_dynamic_ipv4_conf(link);
 737         if (r < 0)
 738                 return r;
 739
 740         if (in6_addr_is_set(&link->ipv6ll_address)) {
 741                 r = link_acquire_dynamic_ipv6_conf(link);
 742                 if (r < 0)
 743                         return r;
 744         }
 745
 746         if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
 747                 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
 748                  * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
 749                  * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
 750                  * below will be called in radv_start(). */
 751                 r = dhcp_request_prefix_delegation(link);
 752                 if (r < 0)
 753                         return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 754         }
 755
 756         if (link->lldp_tx) {
 757                 r = sd_lldp_tx_start(link->lldp_tx);
 758                 if (r < 0)
 759                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
 760         }
 761
 762         if (link->lldp_rx) {
 763                 r = sd_lldp_rx_start(link->lldp_rx);
 764                 if (r < 0)
 765                         return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
 766         }
 767
 768         return 0;
 769 }
 770
 771 int link_ipv6ll_gained(Link *link) {
 772         int r;
 773
 774         assert(link);
 775
 776         log_link_info(link, "Gained IPv6LL");
 777
 778         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 779                 return 0;
 780
 781         r = link_acquire_dynamic_ipv6_conf(link);
 782         if (r < 0)
 783                 return r;
 784
 785         link_check_ready(link);
 786         return 0;
 787 }
 788
 789 int link_handle_bound_to_list(Link *link) {
 790         bool required_up = false;
 791         bool link_is_up = false;
 792         Link *l;
 793
 794         assert(link);
 795
 796         /* If at least one interface in bound_to_links has carrier, then make this interface up.
 797          * If all interfaces in bound_to_links do not, then make this interface down. */
 798
 799         if (hashmap_isempty(link->bound_to_links))
 800                 return 0;
 801
 802         if (link->flags & IFF_UP)
 803                 link_is_up = true;
 804
 805         HASHMAP_FOREACH(l, link->bound_to_links)
 806                 if (link_has_carrier(l)) {
 807                         required_up = true;
 808                         break;
 809                 }
 810
 811         if (!required_up && link_is_up)
 812                 return link_request_to_bring_up_or_down(link, /* up = */ false);
 813         if (required_up && !link_is_up)
 814                 return link_request_to_bring_up_or_down(link, /* up = */ true);
 815
 816         return 0;
 817 }
 818
 819 static int link_handle_bound_by_list(Link *link) {
 820         Link *l;
 821         int r;
 822
 823         assert(link);
 824
 825         /* Update up or down state of interfaces which depend on this interface's carrier state. */
 826
 827         if (hashmap_isempty(link->bound_by_links))
 828                 return 0;
 829
 830         HASHMAP_FOREACH(l, link->bound_by_links) {
 831                 r = link_handle_bound_to_list(l);
 832                 if (r < 0)
 833                         return r;
 834         }
 835
 836         return 0;
 837 }
 838
 839 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
 840         int r;
 841
 842         assert(link);
 843         assert(carrier);
 844
 845         if (link == carrier)
 846                 return 0;
 847
 848         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
 849                 return 0;
 850
 851         r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
 852         if (r < 0)
 853                 return r;
 854
 855         link_dirty(link);
 856
 857         return 0;
 858 }
 859
 860 static int link_new_bound_by_list(Link *link) {
 861         Manager *m;
 862         Link *carrier;
 863         int r;
 864
 865         assert(link);
 866         assert(link->manager);
 867
 868         m = link->manager;
 869
 870         HASHMAP_FOREACH(carrier, m->links_by_index) {
 871                 if (!carrier->network)
 872                         continue;
 873
 874                 if (strv_isempty(carrier->network->bind_carrier))
 875                         continue;
 876
 877                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
 878                         r = link_put_carrier(link, carrier, &link->bound_by_links);
 879                         if (r < 0)
 880                                 return r;
 881                 }
 882         }
 883
 884         HASHMAP_FOREACH(carrier, link->bound_by_links) {
 885                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
 886                 if (r < 0)
 887                         return r;
 888         }
 889
 890         return 0;
 891 }
 892
 893 static int link_new_bound_to_list(Link *link) {
 894         Manager *m;
 895         Link *carrier;
 896         int r;
 897
 898         assert(link);
 899         assert(link->manager);
 900
 901         if (!link->network)
 902                 return 0;
 903
 904         if (strv_isempty(link->network->bind_carrier))
 905                 return 0;
 906
 907         m = link->manager;
 908
 909         HASHMAP_FOREACH(carrier, m->links_by_index) {
 910                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
 911                         r = link_put_carrier(link, carrier, &link->bound_to_links);
 912                         if (r < 0)
 913                                 return r;
 914                 }
 915         }
 916
 917         HASHMAP_FOREACH(carrier, link->bound_to_links) {
 918                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
 919                 if (r < 0)
 920                         return r;
 921         }
 922
 923         return 0;
 924 }
 925
 926 static void link_free_bound_to_list(Link *link) {
 927         bool updated = false;
 928         Link *bound_to;
 929
 930         assert(link);
 931
 932         while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
 933                 updated = true;
 934
 935                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
 936                         link_dirty(bound_to);
 937         }
 938
 939         if (updated)
 940                 link_dirty(link);
 941 }
 942
 943 static void link_free_bound_by_list(Link *link) {
 944         bool updated = false;
 945         Link *bound_by;
 946
 947         assert(link);
 948
 949         while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
 950                 updated = true;
 951
 952                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
 953                         link_dirty(bound_by);
 954                         link_handle_bound_to_list(bound_by);
 955                 }
 956         }
 957
 958         if (updated)
 959                 link_dirty(link);
 960 }
 961
 962 static int link_append_to_master(Link *link) {
 963         Link *master;
 964         int r;
 965
 966         assert(link);
 967
 968         /* - The link may have no master.
 969          * - RTM_NEWLINK message about master interface may not be received yet. */
 970         if (link_get_master(link, &master) < 0)
 971                 return 0;
 972
 973         r = set_ensure_put(&master->slaves, NULL, link);
 974         if (r <= 0)
 975                 return r;
 976
 977         link_ref(link);
 978         return 0;
 979 }
 980
 981 static void link_drop_from_master(Link *link) {
 982         Link *master;
 983
 984         assert(link);
 985
 986         if (!link->manager)
 987                 return;
 988
 989         if (link_get_master(link, &master) < 0)
 990                 return;
 991
 992         link_unref(set_remove(master->slaves, link));
 993 }
 994
 995 static int link_drop_requests(Link *link) {
 996         Request *req;
 997         int ret = 0;
 998
 999         assert(link);
1000         assert(link->manager);
1001
1002         ORDERED_SET_FOREACH(req, link->manager->request_queue) {
1003                 if (req->link != link)
1004                         continue;
1005
1006                 /* If the request is already called, but its reply is not received, then we need to
1007                  * drop the configuration (e.g. address) here. Note, if the configuration is known,
1008                  * it will be handled later by link_drop_foreign_addresses() or so. */
1009                 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
1010                         switch (req->type) {
1011                         case REQUEST_TYPE_ADDRESS: {
1012                                 Address *address = ASSERT_PTR(req->userdata);
1013
1014                                 if (address_get(link, address, NULL) < 0)
1015                                         RET_GATHER(ret, address_remove(address, link));
1016                                 break;
1017                         }
1018                         case REQUEST_TYPE_NEIGHBOR: {
1019                                 Neighbor *neighbor = ASSERT_PTR(req->userdata);
1020
1021                                 if (neighbor_get(link, neighbor, NULL) < 0)
1022                                         RET_GATHER(ret, neighbor_remove(neighbor, link));
1023                                 break;
1024                         }
1025                         case REQUEST_TYPE_NEXTHOP: {
1026                                 NextHop *nexthop = ASSERT_PTR(req->userdata);
1027
1028                                 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
1029                                         RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
1030                                 break;
1031                         }
1032                         case REQUEST_TYPE_ROUTE: {
1033                                 Route *route = ASSERT_PTR(req->userdata);
1034
1035                                 if (route_get(link->manager, route, NULL) < 0)
1036                                         RET_GATHER(ret, route_remove(route, link->manager));
1037                                 break;
1038                         }
1039                         default:
1040                                 ;
1041                         }
1042
1043                 request_detach(req);
1044         }
1045
1046         return ret;
1047 }
1048
1049 static Link *link_drop(Link *link) {
1050         if (!link)
1051                 return NULL;
1052
1053         assert(link->manager);
1054
1055         link_set_state(link, LINK_STATE_LINGER);
1056
1057         /* Drop all references from other links and manager. Note that async netlink calls may have
1058          * references to the link, and they will be dropped when we receive replies. */
1059
1060         (void) link_drop_requests(link);
1061
1062         link_free_bound_to_list(link);
1063         link_free_bound_by_list(link);
1064
1065         link_clear_sr_iov_ifindices(link);
1066
1067         link_drop_from_master(link);
1068
1069         if (link->state_file)
1070                 (void) unlink(link->state_file);
1071
1072         link_clean(link);
1073
1074         STRV_FOREACH(n, link->alternative_names)
1075                 hashmap_remove(link->manager->links_by_name, *n);
1076         hashmap_remove(link->manager->links_by_name, link->ifname);
1077
1078         /* bonding master and its slaves have the same hardware address. */
1079         hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1080
1081         /* The following must be called at last. */
1082         assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1083         return link_unref(link);
1084 }
1085
1086 static int link_drop_foreign_config(Link *link) {
1087         int r;
1088
1089         assert(link);
1090         assert(link->manager);
1091
1092         /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1093          * to remove loopback address or addresses used for root NFS. */
1094
1095         if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1096                 return 0;
1097         if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1098                 return 0;
1099         if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1100                 return 0;
1101
1102         r = link_drop_foreign_routes(link);
1103
1104         RET_GATHER(r, link_drop_foreign_nexthops(link));
1105         RET_GATHER(r, link_drop_foreign_addresses(link));
1106         RET_GATHER(r, link_drop_foreign_neighbors(link));
1107         RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1108
1109         return r;
1110 }
1111
1112 static int link_drop_managed_config(Link *link) {
1113         int r;
1114
1115         assert(link);
1116         assert(link->manager);
1117
1118         r = link_drop_static_routes(link);
1119         RET_GATHER(r, link_drop_static_nexthops(link));
1120         RET_GATHER(r, link_drop_static_addresses(link));
1121         RET_GATHER(r, link_drop_static_neighbors(link));
1122         RET_GATHER(r, link_drop_static_routing_policy_rules(link));
1123
1124         return r;
1125 }
1126
1127 static void link_foreignize_config(Link *link) {
1128         assert(link);
1129         assert(link->manager);
1130
1131         link_foreignize_routes(link);
1132         link_foreignize_nexthops(link);
1133         link_foreignize_addresses(link);
1134         link_foreignize_neighbors(link);
1135         link_foreignize_routing_policy_rules(link);
1136 }
1137
1138 static int link_configure(Link *link) {
1139         int r;
1140
1141         assert(link);
1142         assert(link->network);
1143         assert(link->state == LINK_STATE_INITIALIZED);
1144
1145         link_set_state(link, LINK_STATE_CONFIGURING);
1146
1147         r = link_new_bound_to_list(link);
1148         if (r < 0)
1149                 return r;
1150
1151         r = link_request_traffic_control(link);
1152         if (r < 0)
1153                 return r;
1154
1155         r = link_configure_mtu(link);
1156         if (r < 0)
1157                 return r;
1158
1159         if (link->iftype == ARPHRD_CAN) {
1160                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1161                 r = link_request_to_set_can(link);
1162                 if (r < 0)
1163                         return r;
1164
1165                 return link_request_to_activate(link);
1166         }
1167
1168         r = link_request_sr_iov_vfs(link);
1169         if (r < 0)
1170                 return r;
1171
1172         r = link_set_sysctl(link);
1173         if (r < 0)
1174                 return r;
1175
1176         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1177         if (r < 0)
1178                 return r;
1179
1180         r = link_request_to_set_ipoib(link);
1181         if (r < 0)
1182                 return r;
1183
1184         r = link_request_to_set_flags(link);
1185         if (r < 0)
1186                 return r;
1187
1188         r = link_request_to_set_group(link);
1189         if (r < 0)
1190                 return r;
1191
1192         r = link_request_to_set_addrgen_mode(link);
1193         if (r < 0)
1194                 return r;
1195
1196         r = link_request_to_set_master(link);
1197         if (r < 0)
1198                 return r;
1199
1200         r = link_request_stacked_netdevs(link);
1201         if (r < 0)
1202                 return r;
1203
1204         r = link_request_to_set_bond(link);
1205         if (r < 0)
1206                 return r;
1207
1208         r = link_request_to_set_bridge(link);
1209         if (r < 0)
1210                 return r;
1211
1212         r = link_request_to_set_bridge_vlan(link);
1213         if (r < 0)
1214                 return r;
1215
1216         r = link_request_to_activate(link);
1217         if (r < 0)
1218                 return r;
1219
1220         r = ipv4ll_configure(link);
1221         if (r < 0)
1222                 return r;
1223
1224         r = link_request_dhcp4_client(link);
1225         if (r < 0)
1226                 return r;
1227
1228         r = link_request_dhcp6_client(link);
1229         if (r < 0)
1230                 return r;
1231
1232         r = link_request_ndisc(link);
1233         if (r < 0)
1234                 return r;
1235
1236         r = link_request_dhcp_server(link);
1237         if (r < 0)
1238                 return r;
1239
1240         r = link_request_radv(link);
1241         if (r < 0)
1242                 return r;
1243
1244         r = link_lldp_rx_configure(link);
1245         if (r < 0)
1246                 return r;
1247
1248         r = link_lldp_tx_configure(link);
1249         if (r < 0)
1250                 return r;
1251
1252         r = link_drop_foreign_config(link);
1253         if (r < 0)
1254                 return r;
1255
1256         r = link_request_static_configs(link);
1257         if (r < 0)
1258                 return r;
1259
1260         if (!link_has_carrier(link))
1261                 return 0;
1262
1263         return link_acquire_dynamic_conf(link);
1264 }
1265
1266 static int link_get_network(Link *link, Network **ret) {
1267         Network *network;
1268         int r;
1269
1270         assert(link);
1271         assert(link->manager);
1272         assert(ret);
1273
1274         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1275                 bool warn = false;
1276
1277                 r = net_match_config(
1278                                 &network->match,
1279                                 link->dev,
1280                                 &link->hw_addr,
1281                                 &link->permanent_hw_addr,
1282                                 link->driver,
1283                                 link->iftype,
1284                                 link->kind,
1285                                 link->ifname,
1286                                 link->alternative_names,
1287                                 link->wlan_iftype,
1288                                 link->ssid,
1289                                 &link->bssid);
1290                 if (r < 0)
1291                         return r;
1292                 if (r == 0)
1293                         continue;
1294
1295                 if (network->match.ifname && link->dev) {
1296                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1297                         const char *attr;
1298
1299                         if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1300                                 (void) safe_atou8(attr, &name_assign_type);
1301
1302                         warn = name_assign_type == NET_NAME_ENUM;
1303                 }
1304
1305                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1306                               "found matching network '%s'%s.",
1307                               network->filename,
1308                               warn ? ", based on potentially unpredictable interface name" : "");
1309
1310                 if (network->unmanaged)
1311                         return -ENOENT;
1312
1313                 *ret = network;
1314                 return 0;
1315         }
1316
1317         return -ENOENT;
1318 }
1319
1320 int link_reconfigure_impl(Link *link, bool force) {
1321         Network *network = NULL;
1322         NetDev *netdev = NULL;
1323         int r;
1324
1325         assert(link);
1326
1327         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1328                 return 0;
1329
1330         r = netdev_get(link->manager, link->ifname, &netdev);
1331         if (r < 0 && r != -ENOENT)
1332                 return r;
1333
1334         r = link_get_network(link, &network);
1335         if (r < 0 && r != -ENOENT)
1336                 return r;
1337
1338         if (link->state != LINK_STATE_UNMANAGED && !network)
1339                 /* If link is in initialized state, then link->network is also NULL. */
1340                 force = true;
1341
1342         if (link->network == network && !force)
1343                 return 0;
1344
1345         if (network) {
1346                 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1347
1348                 if (link->state == LINK_STATE_INITIALIZED)
1349                         log_link_info(link, "Configuring with %s%s%s%s.",
1350                                       network->filename,
1351                                       isempty(joined) ? "" : " (dropins: ",
1352                                       joined,
1353                                       isempty(joined) ? "" : ")");
1354                 else
1355                         log_link_info(link, "Reconfiguring with %s%s%s%s.",
1356                                       network->filename,
1357                                       isempty(joined) ? "" : " (dropins: ",
1358                                       joined,
1359                                       isempty(joined) ? "" : ")");
1360         } else
1361                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1362                               "Unmanaging interface.");
1363
1364         /* Dropping old .network file */
1365         r = link_stop_engines(link, false);
1366         if (r < 0)
1367                 return r;
1368
1369         r = link_drop_requests(link);
1370         if (r < 0)
1371                 return r;
1372
1373         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1374                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1375                  * routes, and so on) foreign, and then drop unnecessary configs later by
1376                  * link_drop_foreign_config() in link_configure().
1377                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1378                  * here we need to drop the configs such as addresses, routes, and so on configured by
1379                  * the previously assigned .network file. */
1380                 link_foreignize_config(link);
1381         else {
1382                 /* Remove all managed configs. Note, foreign configs are removed in later by
1383                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1384                 r = link_drop_managed_config(link);
1385                 if (r < 0)
1386                         return r;
1387         }
1388
1389         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1390          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1391          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1392          * map here, as it depends on .network files assigned to other links. */
1393         link_free_bound_to_list(link);
1394
1395         link_free_engines(link);
1396         link->network = network_unref(link->network);
1397
1398         netdev_unref(link->netdev);
1399         link->netdev = netdev_ref(netdev);
1400
1401         if (!network) {
1402                 link_set_state(link, LINK_STATE_UNMANAGED);
1403                 return 0;
1404         }
1405
1406         /* Then, apply new .network file */
1407         link->network = network_ref(network);
1408         link_update_operstate(link, true);
1409         link_dirty(link);
1410
1411         link_set_state(link, LINK_STATE_INITIALIZED);
1412         link->activated = false;
1413
1414         r = link_configure(link);
1415         if (r < 0)
1416                 return r;
1417
1418         return 1;
1419 }
1420
1421 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1422         int r;
1423
1424         assert(link);
1425
1426         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1427         if (r <= 0)
1428                 return r;
1429
1430         r = link_reconfigure_impl(link, force);
1431         if (r < 0) {
1432                 link_enter_failed(link);
1433                 return 0;
1434         }
1435
1436         return r;
1437 }
1438
1439 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1440         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1441 }
1442
1443 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1444         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1445 }
1446
1447 int link_reconfigure(Link *link, bool force) {
1448         int r;
1449
1450         assert(link);
1451
1452         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1453          * the function from being called multiple times simultaneously, refuse to reconfigure the
1454          * interface in these cases. */
1455         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1456                 return 0; /* 0 means no-op. */
1457
1458         r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1459         if (r < 0)
1460                 return r;
1461
1462         return 1; /* 1 means the interface will be reconfigured. */
1463 }
1464
1465 typedef struct ReconfigureData {
1466         Link *link;
1467         Manager *manager;
1468         sd_bus_message *message;
1469 } ReconfigureData;
1470
1471 static void reconfigure_data_destroy_callback(ReconfigureData *data) {
1472         int r;
1473
1474         assert(data);
1475         assert(data->link);
1476         assert(data->manager);
1477         assert(data->manager->reloading > 0);
1478         assert(data->message);
1479
1480         link_unref(data->link);
1481
1482         data->manager->reloading--;
1483         if (data->manager->reloading <= 0) {
1484                 r = sd_bus_reply_method_return(data->message, NULL);
1485                 if (r < 0)
1486                         log_warning_errno(r, "Failed to send reply for 'Reload' DBus method, ignoring: %m");
1487         }
1488
1489         sd_bus_message_unref(data->message);
1490         free(data);
1491 }
1492
1493 static int reconfigure_handler_on_bus_method_reload(sd_netlink *rtnl, sd_netlink_message *m, ReconfigureData *data) {
1494         assert(data);
1495         assert(data->link);
1496         return link_reconfigure_handler_internal(rtnl, m, data->link, /* force = */ false);
1497 }
1498
1499 int link_reconfigure_on_bus_method_reload(Link *link, sd_bus_message *message) {
1500         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1501         _cleanup_free_ ReconfigureData *data = NULL;
1502         int r;
1503
1504         assert(link);
1505         assert(link->manager);
1506         assert(link->manager->rtnl);
1507         assert(message);
1508
1509         /* See comments in link_reconfigure() above. */
1510         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1511                 return 0;
1512
1513         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
1514         if (r < 0)
1515                 return r;
1516
1517         data = new(ReconfigureData, 1);
1518         if (!data)
1519                 return -ENOMEM;
1520
1521         r = netlink_call_async(link->manager->rtnl, NULL, req,
1522                                reconfigure_handler_on_bus_method_reload,
1523                                reconfigure_data_destroy_callback, data);
1524         if (r < 0)
1525                 return r;
1526
1527         *data = (ReconfigureData) {
1528                 .link = link_ref(link),
1529                 .manager = link->manager,
1530                 .message = sd_bus_message_ref(message),
1531         };
1532
1533         link->manager->reloading++;
1534
1535         TAKE_PTR(data);
1536         return 0;
1537 }
1538
1539 static int link_initialized_and_synced(Link *link) {
1540         int r;
1541
1542         assert(link);
1543         assert(link->manager);
1544
1545         if (link->manager->test_mode) {
1546                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1547                 link_set_state(link, LINK_STATE_UNMANAGED);
1548                 return 0;
1549         }
1550
1551         if (link->state == LINK_STATE_PENDING) {
1552                 log_link_debug(link, "Link state is up-to-date");
1553                 link_set_state(link, LINK_STATE_INITIALIZED);
1554
1555                 r = link_new_bound_by_list(link);
1556                 if (r < 0)
1557                         return r;
1558
1559                 r = link_handle_bound_by_list(link);
1560                 if (r < 0)
1561                         return r;
1562         }
1563
1564         return link_reconfigure_impl(link, /* force = */ false);
1565 }
1566
1567 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1568         int r;
1569
1570         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1571         if (r <= 0)
1572                 return r;
1573
1574         r = link_initialized_and_synced(link);
1575         if (r < 0)
1576                 link_enter_failed(link);
1577
1578         return 0;
1579 }
1580
1581 static int link_initialized(Link *link, sd_device *device) {
1582         int r;
1583
1584         assert(link);
1585         assert(device);
1586
1587         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1588          * or sysattrs) may be outdated. */
1589         device_unref_and_replace(link->dev, device);
1590
1591         if (link->dhcp_client) {
1592                 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1593                 if (r < 0)
1594                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1595         }
1596
1597         if (link->dhcp6_client) {
1598                 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1599                 if (r < 0)
1600                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1601         }
1602
1603         r = link_set_sr_iov_ifindices(link);
1604         if (r < 0)
1605                 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1606
1607         if (link->state != LINK_STATE_PENDING)
1608                 return link_reconfigure(link, /* force = */ false);
1609
1610         log_link_debug(link, "udev initialized link");
1611
1612         /* udev has initialized the link, but we don't know if we have yet
1613          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1614          * when it returns we know that the pending NEWLINKs have already been
1615          * processed and that we are up-to-date */
1616
1617         return link_call_getlink(link, link_initialized_handler);
1618 }
1619
1620 static int link_check_initialized(Link *link) {
1621         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1622         int r;
1623
1624         assert(link);
1625
1626         if (!udev_available())
1627                 return link_initialized_and_synced(link);
1628
1629         /* udev should be around */
1630         r = sd_device_new_from_ifindex(&device, link->ifindex);
1631         if (r < 0) {
1632                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1633                 return 0;
1634         }
1635
1636         r = sd_device_get_is_initialized(device);
1637         if (r < 0)
1638                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1639         if (r == 0) {
1640                 /* not yet ready */
1641                 log_link_debug(link, "link pending udev initialization...");
1642                 return 0;
1643         }
1644
1645         r = device_is_renaming(device);
1646         if (r < 0)
1647                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1648         if (r > 0) {
1649                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1650                 return 0;
1651         }
1652
1653         r = device_is_processing(device);
1654         if (r < 0)
1655                 return log_link_warning_errno(link, r, "Failed to determine whether the device is being processed: %m");
1656         if (r > 0) {
1657                 log_link_debug(link, "Interface is being processed by udevd, pending initialization.");
1658                 return 0;
1659         }
1660
1661         return link_initialized(link, device);
1662 }
1663
1664 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1665         int r, ifindex;
1666         const char *s;
1667         Link *link;
1668
1669         assert(m);
1670         assert(device);
1671
1672         r = sd_device_get_ifindex(device, &ifindex);
1673         if (r < 0)
1674                 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1675
1676         r = link_get_by_index(m, ifindex, &link);
1677         if (r < 0) {
1678                 /* This error is not critical, as the corresponding rtnl message may be received later. */
1679                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1680                 return 0;
1681         }
1682
1683         /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1684          * object here. It will be removed only when rtnetlink says so. */
1685         if (action == SD_DEVICE_REMOVE) {
1686                 link->dev = sd_device_unref(link->dev);
1687                 return 0;
1688         }
1689
1690         r = device_is_renaming(device);
1691         if (r < 0)
1692                 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1693         if (r > 0) {
1694                 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1695                 /* TODO:
1696                  * What happens when a device is initialized, then soon renamed after that? When we detect
1697                  * such, maybe we should cancel or postpone all queued requests for the interface. */
1698                 return 0;
1699         }
1700
1701         r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1702         if (r < 0 && r != -ENOENT)
1703                 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1704         if (r >= 0 && !streq(s, "io.systemd.Network")) {
1705                 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1706                 link_set_state(link, LINK_STATE_UNMANAGED);
1707                 return 0;
1708         }
1709
1710         r = link_initialized(link, device);
1711         if (r < 0)
1712                 link_enter_failed(link);
1713
1714         return 0;
1715 }
1716
1717 static int link_carrier_gained(Link *link) {
1718         bool force_reconfigure;
1719         int r;
1720
1721         assert(link);
1722
1723         r = event_source_disable(link->carrier_lost_timer);
1724         if (r < 0)
1725                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1726
1727         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1728          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1729          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1730          * restarted, and the correct network information will be gained.
1731          *
1732          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1733          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1734          * already assigned to the interface (in that case, the .network file does not have the SSID=
1735          * setting in the [Match] section), and the interface is already being configured. Of course,
1736          * there may exist another .network file with higher priority and a matching SSID= setting. But
1737          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1738          *
1739          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1740          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1741         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1742         link->previous_ssid = mfree(link->previous_ssid);
1743
1744         /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1745          * profile wants to match on it with SSID= in its [Match] section.
1746          */
1747         if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1748                 r = link_get_wlan_interface(link);
1749                 if (r < 0)
1750                         return r;
1751         }
1752
1753         /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1754          * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1755          * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1756         r = link_reconfigure_impl(link, force_reconfigure);
1757         if (r != 0)
1758                 return r;
1759
1760         r = link_handle_bound_by_list(link);
1761         if (r < 0)
1762                 return r;
1763
1764         if (link->iftype == ARPHRD_CAN)
1765                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1766                 return 0;
1767
1768         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1769                 r = link_acquire_dynamic_conf(link);
1770                 if (r < 0)
1771                         return r;
1772
1773                 r = link_request_static_configs(link);
1774                 if (r < 0)
1775                         return r;
1776         }
1777
1778         return 0;
1779 }
1780
1781 static int link_carrier_lost_impl(Link *link) {
1782         int r, ret = 0;
1783
1784         assert(link);
1785
1786         link->previous_ssid = mfree(link->previous_ssid);
1787
1788         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1789                 return 0;
1790
1791         if (!link->network)
1792                 return 0;
1793
1794         r = link_stop_engines(link, false);
1795         if (r < 0)
1796                 ret = r;
1797
1798         r = link_drop_managed_config(link);
1799         if (r < 0 && ret >= 0)
1800                 ret = r;
1801
1802         return ret;
1803 }
1804
1805 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1806         Link *link = ASSERT_PTR(userdata);
1807         int r;
1808
1809         r = link_carrier_lost_impl(link);
1810         if (r < 0) {
1811                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1812                 link_enter_failed(link);
1813         }
1814
1815         return 0;
1816 }
1817
1818 static int link_carrier_lost(Link *link) {
1819         uint16_t dhcp_mtu;
1820         usec_t usec;
1821         int r;
1822
1823         assert(link);
1824
1825         r = link_handle_bound_by_list(link);
1826         if (r < 0)
1827                 return r;
1828
1829         if (link->iftype == ARPHRD_CAN)
1830                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1831                 return 0;
1832
1833         if (!link->network)
1834                 return 0;
1835
1836         if (link->network->ignore_carrier_loss_set)
1837                 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1838                 usec = link->network->ignore_carrier_loss_usec;
1839
1840         else if (link->network->bond && link->wlan_iftype > 0)
1841                 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1842                  * carrier to be lost. See #19832. */
1843                 usec = 3 * USEC_PER_SEC;
1844
1845         else if (link->network->dhcp_use_mtu &&
1846                  link->dhcp_lease &&
1847                  sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1848                  dhcp_mtu != link->original_mtu)
1849                 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1850                  * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1851                  * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1852                 usec = 5 * USEC_PER_SEC;
1853
1854         else
1855                 /* Otherwise, use the implied default value. */
1856                 usec = link->network->ignore_carrier_loss_usec;
1857
1858         if (usec == USEC_INFINITY)
1859                 return 0;
1860
1861         if (usec == 0)
1862                 return link_carrier_lost_impl(link);
1863
1864         return event_reset_time_relative(link->manager->event,
1865                                          &link->carrier_lost_timer,
1866                                          CLOCK_BOOTTIME,
1867                                          usec,
1868                                          0,
1869                                          link_carrier_lost_handler,
1870                                          link,
1871                                          0,
1872                                          "link-carrier-loss",
1873                                          true);
1874 }
1875
1876 static int link_admin_state_up(Link *link) {
1877         int r;
1878
1879         assert(link);
1880
1881         /* This is called every time an interface admin state changes to up;
1882          * specifically, when IFF_UP flag changes from unset to set. */
1883
1884         if (!link->network)
1885                 return 0;
1886
1887         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1888                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1889                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1890         }
1891
1892         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1893          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1894         r = link_set_ipv6_mtu(link);
1895         if (r < 0)
1896                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1897
1898         return 0;
1899 }
1900
1901 static int link_admin_state_down(Link *link) {
1902         assert(link);
1903
1904         if (!link->network)
1905                 return 0;
1906
1907         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1908                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1909                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1910         }
1911
1912         return 0;
1913 }
1914
1915 static bool link_is_enslaved(Link *link) {
1916         if (link->flags & IFF_SLAVE)
1917                 return true;
1918
1919         if (link->master_ifindex > 0)
1920                 return true;
1921
1922         return false;
1923 }
1924
1925 void link_update_operstate(Link *link, bool also_update_master) {
1926         LinkOperationalState operstate;
1927         LinkCarrierState carrier_state;
1928         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1929         LinkOnlineState online_state;
1930         _cleanup_strv_free_ char **p = NULL;
1931         bool changed = false;
1932
1933         assert(link);
1934
1935         if (link->kernel_operstate == IF_OPER_DORMANT)
1936                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1937         else if (link_has_carrier(link)) {
1938                 if (link_is_enslaved(link))
1939                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1940                 else
1941                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1942         } else if (link->flags & IFF_UP)
1943                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1944         else
1945                 carrier_state = LINK_CARRIER_STATE_OFF;
1946
1947         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1948                 Link *slave;
1949
1950                 SET_FOREACH(slave, link->slaves) {
1951                         link_update_operstate(slave, false);
1952
1953                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1954                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1955                 }
1956         }
1957
1958         link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1959
1960         /* Mapping of address and carrier state vs operational state
1961          *                                                     carrier state
1962          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1963          *                 ------------------------------------------------------------------------------
1964          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1965          * address_state   degraded | off | no-carrier | dormant | degraded         | degraded | enslaved
1966          *                 routable | off | no-carrier | dormant | routable         | routable | routable
1967          */
1968
1969         if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1970                 operstate = LINK_OPERSTATE_ROUTABLE;
1971         else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1972                 operstate = LINK_OPERSTATE_DEGRADED;
1973         else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1974                 operstate = (LinkOperationalState) carrier_state;
1975         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1976                 operstate = LINK_OPERSTATE_ROUTABLE;
1977         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1978                 operstate = LINK_OPERSTATE_DEGRADED;
1979         else
1980                 operstate = LINK_OPERSTATE_ENSLAVED;
1981
1982         LinkOperationalStateRange req;
1983         link_required_operstate_for_online(link, &req);
1984
1985         /* Only determine online state for managed links with RequiredForOnline=yes */
1986         if (!link->network || !link->network->required_for_online)
1987                 online_state = _LINK_ONLINE_STATE_INVALID;
1988
1989         else if (!operational_state_is_in_range(operstate, &req))
1990                 online_state = LINK_ONLINE_STATE_OFFLINE;
1991
1992         else {
1993                 AddressFamily required_family = link_required_family_for_online(link);
1994                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1995                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1996
1997                 /* The operational state is within the range required for online.
1998                  * If a particular address family is also required, we might revert
1999                  * to offline in the blocks below. */
2000                 online_state = LINK_ONLINE_STATE_ONLINE;
2001
2002                 if (req.min >= LINK_OPERSTATE_DEGRADED) {
2003                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
2004                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2005                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
2006                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2007                 }
2008
2009                 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
2010                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2011                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2012                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2013                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2014                 }
2015         }
2016
2017         if (link->carrier_state != carrier_state) {
2018                 link->carrier_state = carrier_state;
2019                 changed = true;
2020                 if (strv_extend(&p, "CarrierState") < 0)
2021                         log_oom();
2022         }
2023
2024         if (link->address_state != address_state) {
2025                 link->address_state = address_state;
2026                 changed = true;
2027                 if (strv_extend(&p, "AddressState") < 0)
2028                         log_oom();
2029         }
2030
2031         if (link->ipv4_address_state != ipv4_address_state) {
2032                 link->ipv4_address_state = ipv4_address_state;
2033                 changed = true;
2034                 if (strv_extend(&p, "IPv4AddressState") < 0)
2035                         log_oom();
2036         }
2037
2038         if (link->ipv6_address_state != ipv6_address_state) {
2039                 link->ipv6_address_state = ipv6_address_state;
2040                 changed = true;
2041                 if (strv_extend(&p, "IPv6AddressState") < 0)
2042                         log_oom();
2043         }
2044
2045         if (link->operstate != operstate) {
2046                 link->operstate = operstate;
2047                 changed = true;
2048                 if (strv_extend(&p, "OperationalState") < 0)
2049                         log_oom();
2050         }
2051
2052         if (link->online_state != online_state) {
2053                 link->online_state = online_state;
2054                 changed = true;
2055                 if (strv_extend(&p, "OnlineState") < 0)
2056                         log_oom();
2057         }
2058
2059         if (p)
2060                 link_send_changed_strv(link, p);
2061         if (changed)
2062                 link_dirty(link);
2063
2064         if (also_update_master) {
2065                 Link *master;
2066
2067                 if (link_get_master(link, &master) >= 0)
2068                         link_update_operstate(master, true);
2069         }
2070 }
2071
2072 #define FLAG_STRING(string, flag, old, new)                      \
2073         (((old ^ new) & flag)                                    \
2074          ? ((old & flag) ? (" -" string) : (" +" string))        \
2075          : "")
2076
2077 static int link_update_flags(Link *link, sd_netlink_message *message) {
2078         bool link_was_admin_up, had_carrier;
2079         uint8_t operstate;
2080         unsigned flags;
2081         int r;
2082
2083         assert(link);
2084         assert(message);
2085
2086         r = sd_rtnl_message_link_get_flags(message, &flags);
2087         if (r < 0)
2088                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
2089
2090         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
2091         if (r == -ENODATA)
2092                 /* If we got a message without operstate, assume the state was unchanged. */
2093                 operstate = link->kernel_operstate;
2094         else if (r < 0)
2095                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
2096
2097         if (link->flags == flags && link->kernel_operstate == operstate)
2098                 return 0;
2099
2100         if (link->flags != flags) {
2101                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
2102
2103                 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",
2104                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
2105                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
2106                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
2107                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
2108                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
2109                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
2110                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
2111                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
2112                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
2113                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
2114                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
2115                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
2116                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
2117                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
2118                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2119                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2120                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2121                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2122                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2123
2124                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2125                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2126                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2127                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2128                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2129                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2130                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2131                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2132
2133                 if (unknown_flags_added)
2134                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2135
2136                 if (unknown_flags_removed)
2137                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2138         }
2139
2140         link_was_admin_up = link->flags & IFF_UP;
2141         had_carrier = link_has_carrier(link);
2142
2143         link->flags = flags;
2144         link->kernel_operstate = operstate;
2145
2146         link_update_operstate(link, true);
2147
2148         if (!link_was_admin_up && (link->flags & IFF_UP)) {
2149                 log_link_info(link, "Link UP");
2150
2151                 r = link_admin_state_up(link);
2152                 if (r < 0)
2153                         return r;
2154         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2155                 log_link_info(link, "Link DOWN");
2156
2157                 r = link_admin_state_down(link);
2158                 if (r < 0)
2159                         return r;
2160         }
2161
2162         if (!had_carrier && link_has_carrier(link)) {
2163                 log_link_info(link, "Gained carrier");
2164
2165                 r = link_carrier_gained(link);
2166                 if (r < 0)
2167                         return r;
2168         } else if (had_carrier && !link_has_carrier(link)) {
2169                 log_link_info(link, "Lost carrier");
2170
2171                 r = link_carrier_lost(link);
2172                 if (r < 0)
2173                         return r;
2174         }
2175
2176         return 0;
2177 }
2178
2179 static int link_update_master(Link *link, sd_netlink_message *message) {
2180         int master_ifindex, r;
2181
2182         assert(link);
2183         assert(message);
2184
2185         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2186         if (r == -ENODATA)
2187                 return 0;
2188         if (r < 0)
2189                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2190
2191         if (master_ifindex == link->ifindex)
2192                 master_ifindex = 0;
2193
2194         if (master_ifindex != link->master_ifindex) {
2195                 if (link->master_ifindex == 0)
2196                         log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2197                 else if (master_ifindex == 0)
2198                         log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2199                 else
2200                         log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2201                                        special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2202
2203                 link_drop_from_master(link);
2204                 link->master_ifindex = master_ifindex;
2205         }
2206
2207         r = link_append_to_master(link);
2208         if (r < 0)
2209                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2210
2211         return 0;
2212 }
2213
2214 static int link_update_driver(Link *link, sd_netlink_message *message) {
2215         int r;
2216
2217         assert(link);
2218         assert(link->manager);
2219         assert(message);
2220
2221         /* Driver is already read. Assuming the driver is never changed. */
2222         if (link->ethtool_driver_read)
2223                 return 0;
2224
2225         /* When udevd is running, read the driver after the interface is initialized by udevd.
2226          * Otherwise, ethtool may not work correctly. See issue #22538.
2227          * When udevd is not running, read the value when the interface is detected. */
2228         if (udev_available() && !link->dev)
2229                 return 0;
2230
2231         link->ethtool_driver_read = true;
2232
2233         r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2234         if (r < 0) {
2235                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2236                 return 0;
2237         }
2238
2239         log_link_debug(link, "Found driver: %s", strna(link->driver));
2240
2241         if (streq_ptr(link->driver, "dsa")) {
2242                 uint32_t dsa_master_ifindex = 0;
2243
2244                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2245                 if (r < 0 && r != -ENODATA)
2246                         return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2247
2248                 if (dsa_master_ifindex > INT_MAX) {
2249                         log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2250                                        dsa_master_ifindex);
2251                         dsa_master_ifindex = 0;
2252                 }
2253
2254                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2255         }
2256
2257         return 1; /* needs reconfigure */
2258 }
2259
2260 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2261         int r;
2262
2263         assert(link);
2264         assert(link->manager);
2265         assert(message);
2266
2267         if (link->ethtool_permanent_hw_addr_read)
2268                 return 0;
2269
2270         /* When udevd is running, read the permanent hardware address after the interface is
2271          * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2272          * When udevd is not running, read the value when the interface is detected. */
2273         if (udev_available() && !link->dev)
2274                 return 0;
2275
2276         /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2277         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2278         if (r == -ENODATA)
2279                 return 0;
2280         if (r < 0)
2281                 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2282
2283         link->ethtool_permanent_hw_addr_read = true;
2284
2285         r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2286         if (r < 0)
2287                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2288
2289         return 0;
2290 }
2291
2292 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2293         int r;
2294
2295         assert(link);
2296         assert(link->manager);
2297         assert(message);
2298
2299         if (link->permanent_hw_addr.length > 0)
2300                 return 0;
2301
2302         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2303         if (r < 0) {
2304                 if (r != -ENODATA)
2305                         return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2306
2307                 /* Fallback to ethtool for older kernels. */
2308                 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2309                 if (r < 0)
2310                         return r;
2311         }
2312
2313         if (link->permanent_hw_addr.length > 0)
2314                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2315
2316         return 1; /* needs reconfigure */
2317 }
2318
2319 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2320         struct hw_addr_data addr;
2321         int r;
2322
2323         assert(link);
2324         assert(message);
2325
2326         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2327         if (r < 0 && r != -ENODATA)
2328                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2329
2330         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2331         if (r == -ENODATA)
2332                 return 0;
2333         if (r < 0)
2334                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2335
2336         if (hw_addr_equal(&link->hw_addr, &addr))
2337                 return 0;
2338
2339         if (link->hw_addr.length == 0)
2340                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2341         else {
2342                 log_link_debug(link, "Hardware address is changed: %s %s %s",
2343                                HW_ADDR_TO_STR(&link->hw_addr),
2344                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2345                                HW_ADDR_TO_STR(&addr));
2346
2347                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2348         }
2349
2350         link->hw_addr = addr;
2351
2352         if (!hw_addr_is_null(&link->hw_addr)) {
2353                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2354                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2355                         /* bonding master and its slaves have the same hardware address. */
2356                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2357                 if (r < 0)
2358                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2359         }
2360
2361         r = ipv4acd_update_mac(link);
2362         if (r < 0)
2363                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2364
2365         r = ipv4ll_update_mac(link);
2366         if (r < 0)
2367                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2368
2369         r = dhcp4_update_mac(link);
2370         if (r < 0)
2371                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2372
2373         r = dhcp6_update_mac(link);
2374         if (r < 0)
2375                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2376
2377         r = radv_update_mac(link);
2378         if (r < 0)
2379                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2380
2381         if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2382                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2383                 if (r < 0)
2384                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2385         }
2386
2387         if (link->lldp_rx) {
2388                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2389                 if (r < 0)
2390                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2391         }
2392
2393         if (link->lldp_tx) {
2394                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2395                 if (r < 0)
2396                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2397         }
2398
2399         return 1; /* needs reconfigure */
2400 }
2401
2402 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2403         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2404         int r;
2405
2406         assert(link);
2407         assert(message);
2408
2409         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2410         if (r == -ENODATA)
2411                 return 0;
2412         if (r < 0)
2413                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2414         if (mtu == 0)
2415                 return 0;
2416
2417         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2418         if (r < 0 && r != -ENODATA)
2419                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2420
2421         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2422         if (r < 0 && r != -ENODATA)
2423                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2424
2425         if (max_mtu == 0)
2426                 max_mtu = UINT32_MAX;
2427
2428         link->min_mtu = min_mtu;
2429         link->max_mtu = max_mtu;
2430
2431         if (link->original_mtu == 0) {
2432                 link->original_mtu = mtu;
2433                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2434                                link->original_mtu, link->min_mtu, link->max_mtu);
2435         }
2436
2437         if (link->mtu == mtu)
2438                 return 0;
2439
2440         if (link->mtu != 0)
2441                 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2442                                link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2443                                link->min_mtu, link->max_mtu);
2444
2445         link->mtu = mtu;
2446
2447         if (link->dhcp_client) {
2448                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2449                 if (r < 0)
2450                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2451         }
2452
2453         if (link->radv) {
2454                 r = sd_radv_set_mtu(link->radv, link->mtu);
2455                 if (r < 0)
2456                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2457         }
2458
2459         return 0;
2460 }
2461
2462 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2463         _cleanup_strv_free_ char **altnames = NULL;
2464         int r;
2465
2466         assert(link);
2467         assert(message);
2468
2469         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2470         if (r == -ENODATA)
2471                 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2472                  * interface has no alternative name. */
2473                 return 0;
2474         if (r < 0)
2475                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2476
2477         if (strv_equal(altnames, link->alternative_names))
2478                 return 0;
2479
2480         STRV_FOREACH(n, link->alternative_names)
2481                 hashmap_remove(link->manager->links_by_name, *n);
2482
2483         strv_free_and_replace(link->alternative_names, altnames);
2484
2485         STRV_FOREACH(n, link->alternative_names) {
2486                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2487                 if (r < 0)
2488                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2489         }
2490
2491         return 1; /* needs reconfigure */
2492 }
2493
2494 static int link_update_name(Link *link, sd_netlink_message *message) {
2495         char ifname_from_index[IF_NAMESIZE];
2496         const char *ifname;
2497         int r;
2498
2499         assert(link);
2500         assert(message);
2501
2502         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2503         if (r == -ENODATA)
2504                 /* Hmm?? But ok. */
2505                 return 0;
2506         if (r < 0)
2507                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2508
2509         if (streq(ifname, link->ifname))
2510                 return 0;
2511
2512         r = format_ifname(link->ifindex, ifname_from_index);
2513         if (r < 0)
2514                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2515
2516         if (!streq(ifname, ifname_from_index)) {
2517                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2518                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2519                                ifname, ifname_from_index);
2520                 return 0;
2521         }
2522
2523         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2524
2525         hashmap_remove(link->manager->links_by_name, link->ifname);
2526
2527         r = free_and_strdup(&link->ifname, ifname);
2528         if (r < 0)
2529                 return log_oom_debug();
2530
2531         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2532         if (r < 0)
2533                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2534
2535         if (link->dhcp_client) {
2536                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2537                 if (r < 0)
2538                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2539         }
2540
2541         if (link->dhcp6_client) {
2542                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2543                 if (r < 0)
2544                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2545         }
2546
2547         if (link->ndisc) {
2548                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2549                 if (r < 0)
2550                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2551         }
2552
2553         if (link->dhcp_server) {
2554                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2555                 if (r < 0)
2556                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2557         }
2558
2559         if (link->radv) {
2560                 r = sd_radv_set_ifname(link->radv, link->ifname);
2561                 if (r < 0)
2562                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2563         }
2564
2565         if (link->lldp_rx) {
2566                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2567                 if (r < 0)
2568                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2569         }
2570
2571         if (link->lldp_tx) {
2572                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2573                 if (r < 0)
2574                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2575         }
2576
2577         if (link->ipv4ll) {
2578                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2579                 if (r < 0)
2580                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2581         }
2582
2583         r = ipv4acd_set_ifname(link);
2584         if (r < 0)
2585                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2586
2587         return 1; /* needs reconfigure */
2588 }
2589
2590 static int link_update(Link *link, sd_netlink_message *message) {
2591         bool needs_reconfigure = false;
2592         int r;
2593
2594         assert(link);
2595         assert(message);
2596
2597         r = link_update_name(link, message);
2598         if (r < 0)
2599                 return r;
2600         needs_reconfigure = needs_reconfigure || r > 0;
2601
2602         r = link_update_alternative_names(link, message);
2603         if (r < 0)
2604                 return r;
2605         needs_reconfigure = needs_reconfigure || r > 0;
2606
2607         r = link_update_mtu(link, message);
2608         if (r < 0)
2609                 return r;
2610
2611         r = link_update_driver(link, message);
2612         if (r < 0)
2613                 return r;
2614         needs_reconfigure = needs_reconfigure || r > 0;
2615
2616         r = link_update_permanent_hardware_address(link, message);
2617         if (r < 0)
2618                 return r;
2619         needs_reconfigure = needs_reconfigure || r > 0;
2620
2621         r = link_update_hardware_address(link, message);
2622         if (r < 0)
2623                 return r;
2624         needs_reconfigure = needs_reconfigure || r > 0;
2625
2626         r = link_update_master(link, message);
2627         if (r < 0)
2628                 return r;
2629
2630         r = link_update_ipv6ll_addrgen_mode(link, message);
2631         if (r < 0)
2632                 return r;
2633
2634         r = link_update_flags(link, message);
2635         if (r < 0)
2636                 return r;
2637
2638         r = link_update_bridge_vlan(link, message);
2639         if (r < 0)
2640                 return r;
2641
2642         return needs_reconfigure;
2643 }
2644
2645 static Link *link_drop_or_unref(Link *link) {
2646         if (!link)
2647                 return NULL;
2648         if (!link->manager)
2649                 return link_unref(link);
2650         return link_drop(link);
2651 }
2652
2653 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2654
2655 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2656         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2657         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2658         unsigned short iftype;
2659         int r, ifindex;
2660
2661         assert(manager);
2662         assert(message);
2663         assert(ret);
2664
2665         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2666         if (r < 0)
2667                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2668         else if (ifindex <= 0)
2669                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2670
2671         r = sd_rtnl_message_link_get_type(message, &iftype);
2672         if (r < 0)
2673                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2674
2675         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2676         if (r < 0)
2677                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2678
2679         /* check for link kind */
2680         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2681         if (r >= 0) {
2682                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2683                 if (r < 0 && r != -ENODATA)
2684                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2685                 r = sd_netlink_message_exit_container(message);
2686                 if (r < 0)
2687                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2688         }
2689
2690         if (!manager->test_mode) {
2691                 /* Do not update state files when running in test mode. */
2692                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2693                         return log_oom_debug();
2694
2695                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2696                         return log_oom_debug();
2697
2698                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2699                         return log_oom_debug();
2700         }
2701
2702         link = new(Link, 1);
2703         if (!link)
2704                 return -ENOMEM;
2705
2706         *link = (Link) {
2707                 .n_ref = 1,
2708                 .state = LINK_STATE_PENDING,
2709                 .online_state = _LINK_ONLINE_STATE_INVALID,
2710                 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2711                 .ifindex = ifindex,
2712                 .iftype = iftype,
2713                 .ifname = TAKE_PTR(ifname),
2714                 .kind = TAKE_PTR(kind),
2715
2716                 .bridge_vlan_pvid = UINT16_MAX,
2717
2718                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2719
2720                 .state_file = TAKE_PTR(state_file),
2721                 .lease_file = TAKE_PTR(lease_file),
2722                 .lldp_file = TAKE_PTR(lldp_file),
2723
2724                 .n_dns = UINT_MAX,
2725                 .dns_default_route = -1,
2726                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2727                 .mdns = _RESOLVE_SUPPORT_INVALID,
2728                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2729                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2730         };
2731
2732         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2733         if (r < 0)
2734                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2735
2736         link->manager = manager;
2737
2738         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2739         if (r < 0)
2740                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2741
2742         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2743                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2744
2745         /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2746          * message arrived too early. Request the wireless link information again.
2747          */
2748         if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2749                 r = link_get_wlan_interface(link);
2750                 if (r < 0)
2751                         log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2752         }
2753
2754         *ret = TAKE_PTR(link);
2755         return 0;
2756 }
2757
2758 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2759         Link *link = NULL;
2760         NetDev *netdev = NULL;
2761         uint16_t type;
2762         const char *name;
2763         int r, ifindex;
2764
2765         assert(rtnl);
2766         assert(message);
2767         assert(manager);
2768
2769         if (sd_netlink_message_is_error(message)) {
2770                 r = sd_netlink_message_get_errno(message);
2771                 if (r < 0)
2772                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2773
2774                 return 0;
2775         }
2776
2777         r = sd_netlink_message_get_type(message, &type);
2778         if (r < 0) {
2779                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2780                 return 0;
2781         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2782                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2783                 return 0;
2784         }
2785
2786         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2787         if (r < 0) {
2788                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2789                 return 0;
2790         } else if (ifindex <= 0) {
2791                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2792                 return 0;
2793         }
2794
2795         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2796         if (r < 0) {
2797                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2798                 return 0;
2799         }
2800
2801         (void) link_get_by_index(manager, ifindex, &link);
2802         (void) netdev_get(manager, name, &netdev);
2803
2804         switch (type) {
2805         case RTM_NEWLINK:
2806                 if (netdev) {
2807                         /* netdev exists, so make sure the ifindex matches */
2808                         r = netdev_set_ifindex(netdev, message);
2809                         if (r < 0) {
2810                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2811                                 return 0;
2812                         }
2813                 }
2814
2815                 if (!link) {
2816                         /* link is new, so add it */
2817                         r = link_new(manager, message, &link);
2818                         if (r < 0) {
2819                                 log_warning_errno(r, "Could not process new link message: %m");
2820                                 return 0;
2821                         }
2822
2823                         r = link_update(link, message);
2824                         if (r < 0) {
2825                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2826                                 link_enter_failed(link);
2827                                 return 0;
2828                         }
2829
2830                         r = link_check_initialized(link);
2831                         if (r < 0) {
2832                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2833                                 link_enter_failed(link);
2834                                 return 0;
2835                         }
2836                 } else {
2837                         r = link_update(link, message);
2838                         if (r < 0) {
2839                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2840                                 link_enter_failed(link);
2841                                 return 0;
2842                         }
2843                         if (r > 0) {
2844                                 r = link_reconfigure_impl(link, /* force = */ false);
2845                                 if (r < 0) {
2846                                         log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2847                                         link_enter_failed(link);
2848                                         return 0;
2849                                 }
2850                         }
2851                 }
2852                 break;
2853
2854         case RTM_DELLINK:
2855                 link_drop(link);
2856                 netdev_drop(netdev);
2857                 break;
2858
2859         default:
2860                 assert_not_reached();
2861         }
2862
2863         return 1;
2864 }
2865
2866 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2867         uint16_t message_type;
2868         int r;
2869
2870         assert(m);
2871         assert(link);
2872         assert(error_msg);
2873
2874         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2875                 return 0;
2876
2877         r = sd_netlink_message_get_errno(m);
2878         if (r < 0) {
2879                 log_link_message_warning_errno(link, m, r, error_msg);
2880                 link_enter_failed(link);
2881                 return 0;
2882         }
2883
2884         r = sd_netlink_message_get_type(m, &message_type);
2885         if (r < 0) {
2886                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2887                 return 0;
2888         }
2889         if (message_type != RTM_NEWLINK) {
2890                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2891                 return 0;
2892         }
2893
2894         r = link_update(link, m);
2895         if (r < 0) {
2896                 link_enter_failed(link);
2897                 return 0;
2898         }
2899
2900         return 1;
2901 }
2902
2903 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2904         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2905         int r;
2906
2907         assert(link);
2908         assert(link->manager);
2909         assert(link->manager->rtnl);
2910         assert(callback);
2911
2912         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2913         if (r < 0)
2914                 return r;
2915
2916         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2917                                link_netlink_destroy_callback, link);
2918         if (r < 0)
2919                 return r;
2920
2921         link_ref(link);
2922         return 0;
2923 }
2924
2925 static const char* const link_state_table[_LINK_STATE_MAX] = {
2926         [LINK_STATE_PENDING]     = "pending",
2927         [LINK_STATE_INITIALIZED] = "initialized",
2928         [LINK_STATE_CONFIGURING] = "configuring",
2929         [LINK_STATE_CONFIGURED]  = "configured",
2930         [LINK_STATE_UNMANAGED]   = "unmanaged",
2931         [LINK_STATE_FAILED]      = "failed",
2932         [LINK_STATE_LINGER]      = "linger",
2933 };
2934
2935 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2936
2937 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2938         _cleanup_free_ char *str = NULL;
2939         static const char* map[] = {
2940                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2941                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid. */
2942                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2943                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2944                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2945                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2946                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2947                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2948                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2949                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2950                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2951                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2952                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast. */
2953                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2954                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2955                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2956                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2957                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2958                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2959         };
2960
2961         assert(ret);
2962
2963         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2964                 if (FLAGS_SET(flags, 1 << i) && map[i])
2965                         if (!strextend_with_separator(&str, ",", map[i]))
2966                                 return -ENOMEM;
2967
2968         *ret = TAKE_PTR(str);
2969         return 0;
2970 }
2971
2972 static const char * const kernel_operstate_table[] = {
2973         [IF_OPER_UNKNOWN]        = "unknown",
2974         [IF_OPER_NOTPRESENT]     = "not-present",
2975         [IF_OPER_DOWN]           = "down",
2976         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2977         [IF_OPER_TESTING]        = "testing",
2978         [IF_OPER_DORMANT]        = "dormant",
2979         [IF_OPER_UP]             = "up",
2980 };
2981
2982 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);