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_ipv6_accept_ra_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_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
 563                 (!link->network->ipv6_accept_ra_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 (!dhcp4_ready)
 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 (!dhcp6_ready)
 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_managed_routes(link);
1119
1120         RET_GATHER(r, link_drop_managed_nexthops(link));
1121         RET_GATHER(r, link_drop_managed_addresses(link));
1122         RET_GATHER(r, link_drop_managed_neighbors(link));
1123         RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1124
1125         return r;
1126 }
1127
1128 static void link_foreignize_config(Link *link) {
1129         assert(link);
1130         assert(link->manager);
1131
1132         link_foreignize_routes(link);
1133         link_foreignize_nexthops(link);
1134         link_foreignize_addresses(link);
1135         link_foreignize_neighbors(link);
1136         link_foreignize_routing_policy_rules(link);
1137 }
1138
1139 static int link_configure(Link *link) {
1140         int r;
1141
1142         assert(link);
1143         assert(link->network);
1144         assert(link->state == LINK_STATE_INITIALIZED);
1145
1146         link_set_state(link, LINK_STATE_CONFIGURING);
1147
1148         r = link_new_bound_to_list(link);
1149         if (r < 0)
1150                 return r;
1151
1152         r = link_request_traffic_control(link);
1153         if (r < 0)
1154                 return r;
1155
1156         r = link_configure_mtu(link);
1157         if (r < 0)
1158                 return r;
1159
1160         if (link->iftype == ARPHRD_CAN) {
1161                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1162                 r = link_request_to_set_can(link);
1163                 if (r < 0)
1164                         return r;
1165
1166                 return link_request_to_activate(link);
1167         }
1168
1169         r = link_request_sr_iov_vfs(link);
1170         if (r < 0)
1171                 return r;
1172
1173         r = link_set_sysctl(link);
1174         if (r < 0)
1175                 return r;
1176
1177         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1178         if (r < 0)
1179                 return r;
1180
1181         r = link_request_to_set_ipoib(link);
1182         if (r < 0)
1183                 return r;
1184
1185         r = link_request_to_set_flags(link);
1186         if (r < 0)
1187                 return r;
1188
1189         r = link_request_to_set_group(link);
1190         if (r < 0)
1191                 return r;
1192
1193         r = link_request_to_set_addrgen_mode(link);
1194         if (r < 0)
1195                 return r;
1196
1197         r = link_request_to_set_master(link);
1198         if (r < 0)
1199                 return r;
1200
1201         r = link_request_stacked_netdevs(link);
1202         if (r < 0)
1203                 return r;
1204
1205         r = link_request_to_set_bond(link);
1206         if (r < 0)
1207                 return r;
1208
1209         r = link_request_to_set_bridge(link);
1210         if (r < 0)
1211                 return r;
1212
1213         r = link_request_to_set_bridge_vlan(link);
1214         if (r < 0)
1215                 return r;
1216
1217         r = link_request_to_activate(link);
1218         if (r < 0)
1219                 return r;
1220
1221         r = ipv4ll_configure(link);
1222         if (r < 0)
1223                 return r;
1224
1225         r = link_request_dhcp4_client(link);
1226         if (r < 0)
1227                 return r;
1228
1229         r = link_request_dhcp6_client(link);
1230         if (r < 0)
1231                 return r;
1232
1233         r = link_request_ndisc(link);
1234         if (r < 0)
1235                 return r;
1236
1237         r = link_request_dhcp_server(link);
1238         if (r < 0)
1239                 return r;
1240
1241         r = link_request_radv(link);
1242         if (r < 0)
1243                 return r;
1244
1245         r = link_lldp_rx_configure(link);
1246         if (r < 0)
1247                 return r;
1248
1249         r = link_lldp_tx_configure(link);
1250         if (r < 0)
1251                 return r;
1252
1253         r = link_drop_foreign_config(link);
1254         if (r < 0)
1255                 return r;
1256
1257         r = link_request_static_configs(link);
1258         if (r < 0)
1259                 return r;
1260
1261         if (!link_has_carrier(link))
1262                 return 0;
1263
1264         return link_acquire_dynamic_conf(link);
1265 }
1266
1267 static int link_get_network(Link *link, Network **ret) {
1268         Network *network;
1269         int r;
1270
1271         assert(link);
1272         assert(link->manager);
1273         assert(ret);
1274
1275         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1276                 bool warn = false;
1277
1278                 r = net_match_config(
1279                                 &network->match,
1280                                 link->dev,
1281                                 &link->hw_addr,
1282                                 &link->permanent_hw_addr,
1283                                 link->driver,
1284                                 link->iftype,
1285                                 link->kind,
1286                                 link->ifname,
1287                                 link->alternative_names,
1288                                 link->wlan_iftype,
1289                                 link->ssid,
1290                                 &link->bssid);
1291                 if (r < 0)
1292                         return r;
1293                 if (r == 0)
1294                         continue;
1295
1296                 if (network->match.ifname && link->dev) {
1297                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1298                         const char *attr;
1299
1300                         if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1301                                 (void) safe_atou8(attr, &name_assign_type);
1302
1303                         warn = name_assign_type == NET_NAME_ENUM;
1304                 }
1305
1306                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1307                               "found matching network '%s'%s.",
1308                               network->filename,
1309                               warn ? ", based on potentially unpredictable interface name" : "");
1310
1311                 if (network->unmanaged)
1312                         return -ENOENT;
1313
1314                 *ret = network;
1315                 return 0;
1316         }
1317
1318         return -ENOENT;
1319 }
1320
1321 int link_reconfigure_impl(Link *link, bool force) {
1322         Network *network = NULL;
1323         NetDev *netdev = NULL;
1324         int r;
1325
1326         assert(link);
1327
1328         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1329                 return 0;
1330
1331         r = netdev_get(link->manager, link->ifname, &netdev);
1332         if (r < 0 && r != -ENOENT)
1333                 return r;
1334
1335         r = link_get_network(link, &network);
1336         if (r < 0 && r != -ENOENT)
1337                 return r;
1338
1339         if (link->state != LINK_STATE_UNMANAGED && !network)
1340                 /* If link is in initialized state, then link->network is also NULL. */
1341                 force = true;
1342
1343         if (link->network == network && !force)
1344                 return 0;
1345
1346         if (network) {
1347                 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1348
1349                 if (link->state == LINK_STATE_INITIALIZED)
1350                         log_link_info(link, "Configuring with %s%s%s%s.",
1351                                       network->filename,
1352                                       isempty(joined) ? "" : " (dropins: ",
1353                                       joined,
1354                                       isempty(joined) ? "" : ")");
1355                 else
1356                         log_link_info(link, "Reconfiguring with %s%s%s%s.",
1357                                       network->filename,
1358                                       isempty(joined) ? "" : " (dropins: ",
1359                                       joined,
1360                                       isempty(joined) ? "" : ")");
1361         } else
1362                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1363                               "Unmanaging interface.");
1364
1365         /* Dropping old .network file */
1366         r = link_stop_engines(link, false);
1367         if (r < 0)
1368                 return r;
1369
1370         r = link_drop_requests(link);
1371         if (r < 0)
1372                 return r;
1373
1374         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1375                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1376                  * routes, and so on) foreign, and then drop unnecessary configs later by
1377                  * link_drop_foreign_config() in link_configure().
1378                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1379                  * here we need to drop the configs such as addresses, routes, and so on configured by
1380                  * the previously assigned .network file. */
1381                 link_foreignize_config(link);
1382         else {
1383                 /* Remove all managed configs. Note, foreign configs are removed in later by
1384                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1385                 r = link_drop_managed_config(link);
1386                 if (r < 0)
1387                         return r;
1388         }
1389
1390         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1391          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1392          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1393          * map here, as it depends on .network files assigned to other links. */
1394         link_free_bound_to_list(link);
1395
1396         link_free_engines(link);
1397         link->network = network_unref(link->network);
1398
1399         netdev_unref(link->netdev);
1400         link->netdev = netdev_ref(netdev);
1401
1402         if (!network) {
1403                 link_set_state(link, LINK_STATE_UNMANAGED);
1404                 return 0;
1405         }
1406
1407         /* Then, apply new .network file */
1408         link->network = network_ref(network);
1409         link_update_operstate(link, true);
1410         link_dirty(link);
1411
1412         link_set_state(link, LINK_STATE_INITIALIZED);
1413         link->activated = false;
1414
1415         r = link_configure(link);
1416         if (r < 0)
1417                 return r;
1418
1419         return 1;
1420 }
1421
1422 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1423         int r;
1424
1425         assert(link);
1426
1427         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1428         if (r <= 0)
1429                 return r;
1430
1431         r = link_reconfigure_impl(link, force);
1432         if (r < 0) {
1433                 link_enter_failed(link);
1434                 return 0;
1435         }
1436
1437         return r;
1438 }
1439
1440 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1441         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1442 }
1443
1444 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1445         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1446 }
1447
1448 int link_reconfigure(Link *link, bool force) {
1449         int r;
1450
1451         assert(link);
1452
1453         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1454          * the function from being called multiple times simultaneously, refuse to reconfigure the
1455          * interface in these cases. */
1456         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1457                 return 0; /* 0 means no-op. */
1458
1459         r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1460         if (r < 0)
1461                 return r;
1462
1463         return 1; /* 1 means the interface will be reconfigured. */
1464 }
1465
1466 typedef struct ReconfigureData {
1467         Link *link;
1468         Manager *manager;
1469         sd_bus_message *message;
1470 } ReconfigureData;
1471
1472 static void reconfigure_data_destroy_callback(ReconfigureData *data) {
1473         int r;
1474
1475         assert(data);
1476         assert(data->link);
1477         assert(data->manager);
1478         assert(data->manager->reloading > 0);
1479         assert(data->message);
1480
1481         link_unref(data->link);
1482
1483         data->manager->reloading--;
1484         if (data->manager->reloading <= 0) {
1485                 r = sd_bus_reply_method_return(data->message, NULL);
1486                 if (r < 0)
1487                         log_warning_errno(r, "Failed to send reply for 'Reload' DBus method, ignoring: %m");
1488         }
1489
1490         sd_bus_message_unref(data->message);
1491         free(data);
1492 }
1493
1494 static int reconfigure_handler_on_bus_method_reload(sd_netlink *rtnl, sd_netlink_message *m, ReconfigureData *data) {
1495         assert(data);
1496         assert(data->link);
1497         return link_reconfigure_handler_internal(rtnl, m, data->link, /* force = */ false);
1498 }
1499
1500 int link_reconfigure_on_bus_method_reload(Link *link, sd_bus_message *message) {
1501         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1502         _cleanup_free_ ReconfigureData *data = NULL;
1503         int r;
1504
1505         assert(link);
1506         assert(link->manager);
1507         assert(link->manager->rtnl);
1508         assert(message);
1509
1510         /* See comments in link_reconfigure() above. */
1511         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1512                 return 0;
1513
1514         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
1515         if (r < 0)
1516                 return r;
1517
1518         data = new(ReconfigureData, 1);
1519         if (!data)
1520                 return -ENOMEM;
1521
1522         r = netlink_call_async(link->manager->rtnl, NULL, req,
1523                                reconfigure_handler_on_bus_method_reload,
1524                                reconfigure_data_destroy_callback, data);
1525         if (r < 0)
1526                 return r;
1527
1528         *data = (ReconfigureData) {
1529                 .link = link_ref(link),
1530                 .manager = link->manager,
1531                 .message = sd_bus_message_ref(message),
1532         };
1533
1534         link->manager->reloading++;
1535
1536         TAKE_PTR(data);
1537         return 0;
1538 }
1539
1540 static int link_initialized_and_synced(Link *link) {
1541         int r;
1542
1543         assert(link);
1544         assert(link->manager);
1545
1546         if (link->manager->test_mode) {
1547                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1548                 link_set_state(link, LINK_STATE_UNMANAGED);
1549                 return 0;
1550         }
1551
1552         if (link->state == LINK_STATE_PENDING) {
1553                 log_link_debug(link, "Link state is up-to-date");
1554                 link_set_state(link, LINK_STATE_INITIALIZED);
1555
1556                 r = link_new_bound_by_list(link);
1557                 if (r < 0)
1558                         return r;
1559
1560                 r = link_handle_bound_by_list(link);
1561                 if (r < 0)
1562                         return r;
1563         }
1564
1565         return link_reconfigure_impl(link, /* force = */ false);
1566 }
1567
1568 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1569         int r;
1570
1571         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1572         if (r <= 0)
1573                 return r;
1574
1575         r = link_initialized_and_synced(link);
1576         if (r < 0)
1577                 link_enter_failed(link);
1578
1579         return 0;
1580 }
1581
1582 static int link_initialized(Link *link, sd_device *device) {
1583         int r;
1584
1585         assert(link);
1586         assert(device);
1587
1588         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1589          * or sysattrs) may be outdated. */
1590         device_unref_and_replace(link->dev, device);
1591
1592         if (link->dhcp_client) {
1593                 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1594                 if (r < 0)
1595                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1596         }
1597
1598         if (link->dhcp6_client) {
1599                 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1600                 if (r < 0)
1601                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1602         }
1603
1604         r = link_set_sr_iov_ifindices(link);
1605         if (r < 0)
1606                 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1607
1608         if (link->state != LINK_STATE_PENDING)
1609                 return link_reconfigure(link, /* force = */ false);
1610
1611         log_link_debug(link, "udev initialized link");
1612
1613         /* udev has initialized the link, but we don't know if we have yet
1614          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1615          * when it returns we know that the pending NEWLINKs have already been
1616          * processed and that we are up-to-date */
1617
1618         return link_call_getlink(link, link_initialized_handler);
1619 }
1620
1621 static int link_check_initialized(Link *link) {
1622         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1623         int r;
1624
1625         assert(link);
1626
1627         if (!udev_available())
1628                 return link_initialized_and_synced(link);
1629
1630         /* udev should be around */
1631         r = sd_device_new_from_ifindex(&device, link->ifindex);
1632         if (r < 0) {
1633                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1634                 return 0;
1635         }
1636
1637         r = sd_device_get_is_initialized(device);
1638         if (r < 0)
1639                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1640         if (r == 0) {
1641                 /* not yet ready */
1642                 log_link_debug(link, "link pending udev initialization...");
1643                 return 0;
1644         }
1645
1646         r = device_is_renaming(device);
1647         if (r < 0)
1648                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1649         if (r > 0) {
1650                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1651                 return 0;
1652         }
1653
1654         r = device_is_processing(device);
1655         if (r < 0)
1656                 return log_link_warning_errno(link, r, "Failed to determine whether the device is being processed: %m");
1657         if (r > 0) {
1658                 log_link_debug(link, "Interface is being processed by udevd, pending initialization.");
1659                 return 0;
1660         }
1661
1662         return link_initialized(link, device);
1663 }
1664
1665 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1666         int r, ifindex;
1667         const char *s;
1668         Link *link;
1669
1670         assert(m);
1671         assert(device);
1672
1673         r = sd_device_get_ifindex(device, &ifindex);
1674         if (r < 0)
1675                 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1676
1677         r = link_get_by_index(m, ifindex, &link);
1678         if (r < 0) {
1679                 /* This error is not critical, as the corresponding rtnl message may be received later. */
1680                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1681                 return 0;
1682         }
1683
1684         /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1685          * object here. It will be removed only when rtnetlink says so. */
1686         if (action == SD_DEVICE_REMOVE) {
1687                 link->dev = sd_device_unref(link->dev);
1688                 return 0;
1689         }
1690
1691         r = device_is_renaming(device);
1692         if (r < 0)
1693                 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1694         if (r > 0) {
1695                 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1696                 /* TODO:
1697                  * What happens when a device is initialized, then soon renamed after that? When we detect
1698                  * such, maybe we should cancel or postpone all queued requests for the interface. */
1699                 return 0;
1700         }
1701
1702         r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1703         if (r < 0 && r != -ENOENT)
1704                 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1705         if (r >= 0 && !streq(s, "io.systemd.Network")) {
1706                 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1707                 link_set_state(link, LINK_STATE_UNMANAGED);
1708                 return 0;
1709         }
1710
1711         r = link_initialized(link, device);
1712         if (r < 0)
1713                 link_enter_failed(link);
1714
1715         return 0;
1716 }
1717
1718 static int link_carrier_gained(Link *link) {
1719         bool force_reconfigure;
1720         int r;
1721
1722         assert(link);
1723
1724         r = event_source_disable(link->carrier_lost_timer);
1725         if (r < 0)
1726                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1727
1728         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1729          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1730          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1731          * restarted, and the correct network information will be gained.
1732          *
1733          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1734          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1735          * already assigned to the interface (in that case, the .network file does not have the SSID=
1736          * setting in the [Match] section), and the interface is already being configured. Of course,
1737          * there may exist another .network file with higher priority and a matching SSID= setting. But
1738          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1739          *
1740          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1741          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1742         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1743         link->previous_ssid = mfree(link->previous_ssid);
1744
1745         /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1746          * profile wants to match on it with SSID= in its [Match] section.
1747          */
1748         if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1749                 r = link_get_wlan_interface(link);
1750                 if (r < 0)
1751                         return r;
1752         }
1753
1754         /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1755          * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1756          * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1757         r = link_reconfigure_impl(link, force_reconfigure);
1758         if (r != 0)
1759                 return r;
1760
1761         r = link_handle_bound_by_list(link);
1762         if (r < 0)
1763                 return r;
1764
1765         if (link->iftype == ARPHRD_CAN)
1766                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1767                 return 0;
1768
1769         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1770                 r = link_acquire_dynamic_conf(link);
1771                 if (r < 0)
1772                         return r;
1773
1774                 r = link_request_static_configs(link);
1775                 if (r < 0)
1776                         return r;
1777         }
1778
1779         return 0;
1780 }
1781
1782 static int link_carrier_lost_impl(Link *link) {
1783         int r, ret = 0;
1784
1785         assert(link);
1786
1787         link->previous_ssid = mfree(link->previous_ssid);
1788
1789         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1790                 return 0;
1791
1792         if (!link->network)
1793                 return 0;
1794
1795         r = link_stop_engines(link, false);
1796         if (r < 0)
1797                 ret = r;
1798
1799         r = link_drop_managed_config(link);
1800         if (r < 0 && ret >= 0)
1801                 ret = r;
1802
1803         return ret;
1804 }
1805
1806 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1807         Link *link = ASSERT_PTR(userdata);
1808         int r;
1809
1810         r = link_carrier_lost_impl(link);
1811         if (r < 0) {
1812                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1813                 link_enter_failed(link);
1814         }
1815
1816         return 0;
1817 }
1818
1819 static int link_carrier_lost(Link *link) {
1820         uint16_t dhcp_mtu;
1821         usec_t usec;
1822         int r;
1823
1824         assert(link);
1825
1826         r = link_handle_bound_by_list(link);
1827         if (r < 0)
1828                 return r;
1829
1830         if (link->iftype == ARPHRD_CAN)
1831                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1832                 return 0;
1833
1834         if (!link->network)
1835                 return 0;
1836
1837         if (link->network->ignore_carrier_loss_set)
1838                 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1839                 usec = link->network->ignore_carrier_loss_usec;
1840
1841         else if (link->network->bond && link->wlan_iftype > 0)
1842                 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1843                  * carrier to be lost. See #19832. */
1844                 usec = 3 * USEC_PER_SEC;
1845
1846         else if (link->network->dhcp_use_mtu &&
1847                  link->dhcp_lease &&
1848                  sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1849                  dhcp_mtu != link->original_mtu)
1850                 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1851                  * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1852                  * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1853                 usec = 5 * USEC_PER_SEC;
1854
1855         else
1856                 /* Otherwise, use the implied default value. */
1857                 usec = link->network->ignore_carrier_loss_usec;
1858
1859         if (usec == USEC_INFINITY)
1860                 return 0;
1861
1862         if (usec == 0)
1863                 return link_carrier_lost_impl(link);
1864
1865         return event_reset_time_relative(link->manager->event,
1866                                          &link->carrier_lost_timer,
1867                                          CLOCK_BOOTTIME,
1868                                          usec,
1869                                          0,
1870                                          link_carrier_lost_handler,
1871                                          link,
1872                                          0,
1873                                          "link-carrier-loss",
1874                                          true);
1875 }
1876
1877 static int link_admin_state_up(Link *link) {
1878         int r;
1879
1880         assert(link);
1881
1882         /* This is called every time an interface admin state changes to up;
1883          * specifically, when IFF_UP flag changes from unset to set. */
1884
1885         if (!link->network)
1886                 return 0;
1887
1888         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1889                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1890                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1891         }
1892
1893         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1894          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1895         r = link_set_ipv6_mtu(link);
1896         if (r < 0)
1897                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1898
1899         return 0;
1900 }
1901
1902 static int link_admin_state_down(Link *link) {
1903         assert(link);
1904
1905         if (!link->network)
1906                 return 0;
1907
1908         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1909                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1910                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1911         }
1912
1913         return 0;
1914 }
1915
1916 static bool link_is_enslaved(Link *link) {
1917         if (link->flags & IFF_SLAVE)
1918                 return true;
1919
1920         if (link->master_ifindex > 0)
1921                 return true;
1922
1923         return false;
1924 }
1925
1926 void link_update_operstate(Link *link, bool also_update_master) {
1927         LinkOperationalState operstate;
1928         LinkCarrierState carrier_state;
1929         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1930         LinkOnlineState online_state;
1931         _cleanup_strv_free_ char **p = NULL;
1932         bool changed = false;
1933
1934         assert(link);
1935
1936         if (link->kernel_operstate == IF_OPER_DORMANT)
1937                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1938         else if (link_has_carrier(link)) {
1939                 if (link_is_enslaved(link))
1940                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1941                 else
1942                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1943         } else if (link->flags & IFF_UP)
1944                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1945         else
1946                 carrier_state = LINK_CARRIER_STATE_OFF;
1947
1948         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1949                 Link *slave;
1950
1951                 SET_FOREACH(slave, link->slaves) {
1952                         link_update_operstate(slave, false);
1953
1954                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1955                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1956                 }
1957         }
1958
1959         link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1960
1961         /* Mapping of address and carrier state vs operational state
1962          *                                                     carrier state
1963          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1964          *                 ------------------------------------------------------------------------------
1965          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1966          * address_state   degraded | off | no-carrier | dormant | degraded         | degraded | enslaved
1967          *                 routable | off | no-carrier | dormant | routable         | routable | routable
1968          */
1969
1970         if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1971                 operstate = LINK_OPERSTATE_ROUTABLE;
1972         else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1973                 operstate = LINK_OPERSTATE_DEGRADED;
1974         else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1975                 operstate = (LinkOperationalState) carrier_state;
1976         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1977                 operstate = LINK_OPERSTATE_ROUTABLE;
1978         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1979                 operstate = LINK_OPERSTATE_DEGRADED;
1980         else
1981                 operstate = LINK_OPERSTATE_ENSLAVED;
1982
1983         LinkOperationalStateRange req;
1984         link_required_operstate_for_online(link, &req);
1985
1986         /* Only determine online state for managed links with RequiredForOnline=yes */
1987         if (!link->network || !link->network->required_for_online)
1988                 online_state = _LINK_ONLINE_STATE_INVALID;
1989
1990         else if (!operational_state_is_in_range(operstate, &req))
1991                 online_state = LINK_ONLINE_STATE_OFFLINE;
1992
1993         else {
1994                 AddressFamily required_family = link_required_family_for_online(link);
1995                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1996                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1997
1998                 /* The operational state is within the range required for online.
1999                  * If a particular address family is also required, we might revert
2000                  * to offline in the blocks below. */
2001                 online_state = LINK_ONLINE_STATE_ONLINE;
2002
2003                 if (req.min >= LINK_OPERSTATE_DEGRADED) {
2004                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
2005                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2006                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
2007                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2008                 }
2009
2010                 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
2011                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2012                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2013                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
2014                                 online_state = LINK_ONLINE_STATE_OFFLINE;
2015                 }
2016         }
2017
2018         if (link->carrier_state != carrier_state) {
2019                 link->carrier_state = carrier_state;
2020                 changed = true;
2021                 if (strv_extend(&p, "CarrierState") < 0)
2022                         log_oom();
2023         }
2024
2025         if (link->address_state != address_state) {
2026                 link->address_state = address_state;
2027                 changed = true;
2028                 if (strv_extend(&p, "AddressState") < 0)
2029                         log_oom();
2030         }
2031
2032         if (link->ipv4_address_state != ipv4_address_state) {
2033                 link->ipv4_address_state = ipv4_address_state;
2034                 changed = true;
2035                 if (strv_extend(&p, "IPv4AddressState") < 0)
2036                         log_oom();
2037         }
2038
2039         if (link->ipv6_address_state != ipv6_address_state) {
2040                 link->ipv6_address_state = ipv6_address_state;
2041                 changed = true;
2042                 if (strv_extend(&p, "IPv6AddressState") < 0)
2043                         log_oom();
2044         }
2045
2046         if (link->operstate != operstate) {
2047                 link->operstate = operstate;
2048                 changed = true;
2049                 if (strv_extend(&p, "OperationalState") < 0)
2050                         log_oom();
2051         }
2052
2053         if (link->online_state != online_state) {
2054                 link->online_state = online_state;
2055                 changed = true;
2056                 if (strv_extend(&p, "OnlineState") < 0)
2057                         log_oom();
2058         }
2059
2060         if (p)
2061                 link_send_changed_strv(link, p);
2062         if (changed)
2063                 link_dirty(link);
2064
2065         if (also_update_master) {
2066                 Link *master;
2067
2068                 if (link_get_master(link, &master) >= 0)
2069                         link_update_operstate(master, true);
2070         }
2071 }
2072
2073 #define FLAG_STRING(string, flag, old, new)                      \
2074         (((old ^ new) & flag)                                    \
2075          ? ((old & flag) ? (" -" string) : (" +" string))        \
2076          : "")
2077
2078 static int link_update_flags(Link *link, sd_netlink_message *message) {
2079         bool link_was_admin_up, had_carrier;
2080         uint8_t operstate;
2081         unsigned flags;
2082         int r;
2083
2084         assert(link);
2085         assert(message);
2086
2087         r = sd_rtnl_message_link_get_flags(message, &flags);
2088         if (r < 0)
2089                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
2090
2091         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
2092         if (r == -ENODATA)
2093                 /* If we got a message without operstate, assume the state was unchanged. */
2094                 operstate = link->kernel_operstate;
2095         else if (r < 0)
2096                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
2097
2098         if (link->flags == flags && link->kernel_operstate == operstate)
2099                 return 0;
2100
2101         if (link->flags != flags) {
2102                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
2103
2104                 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",
2105                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
2106                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
2107                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
2108                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
2109                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
2110                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
2111                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
2112                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
2113                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
2114                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
2115                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
2116                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
2117                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
2118                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
2119                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2120                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2121                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2122                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2123                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2124
2125                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2126                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2127                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2128                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2129                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2130                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2131                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2132                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2133
2134                 if (unknown_flags_added)
2135                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2136
2137                 if (unknown_flags_removed)
2138                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2139         }
2140
2141         link_was_admin_up = link->flags & IFF_UP;
2142         had_carrier = link_has_carrier(link);
2143
2144         link->flags = flags;
2145         link->kernel_operstate = operstate;
2146
2147         link_update_operstate(link, true);
2148
2149         if (!link_was_admin_up && (link->flags & IFF_UP)) {
2150                 log_link_info(link, "Link UP");
2151
2152                 r = link_admin_state_up(link);
2153                 if (r < 0)
2154                         return r;
2155         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2156                 log_link_info(link, "Link DOWN");
2157
2158                 r = link_admin_state_down(link);
2159                 if (r < 0)
2160                         return r;
2161         }
2162
2163         if (!had_carrier && link_has_carrier(link)) {
2164                 log_link_info(link, "Gained carrier");
2165
2166                 r = link_carrier_gained(link);
2167                 if (r < 0)
2168                         return r;
2169         } else if (had_carrier && !link_has_carrier(link)) {
2170                 log_link_info(link, "Lost carrier");
2171
2172                 r = link_carrier_lost(link);
2173                 if (r < 0)
2174                         return r;
2175         }
2176
2177         return 0;
2178 }
2179
2180 static int link_update_master(Link *link, sd_netlink_message *message) {
2181         int master_ifindex, r;
2182
2183         assert(link);
2184         assert(message);
2185
2186         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2187         if (r == -ENODATA)
2188                 return 0;
2189         if (r < 0)
2190                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2191
2192         if (master_ifindex == link->ifindex)
2193                 master_ifindex = 0;
2194
2195         if (master_ifindex != link->master_ifindex) {
2196                 if (link->master_ifindex == 0)
2197                         log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2198                 else if (master_ifindex == 0)
2199                         log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2200                 else
2201                         log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2202                                        special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2203
2204                 link_drop_from_master(link);
2205                 link->master_ifindex = master_ifindex;
2206         }
2207
2208         r = link_append_to_master(link);
2209         if (r < 0)
2210                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2211
2212         return 0;
2213 }
2214
2215 static int link_update_driver(Link *link, sd_netlink_message *message) {
2216         int r;
2217
2218         assert(link);
2219         assert(link->manager);
2220         assert(message);
2221
2222         /* Driver is already read. Assuming the driver is never changed. */
2223         if (link->ethtool_driver_read)
2224                 return 0;
2225
2226         /* When udevd is running, read the driver after the interface is initialized by udevd.
2227          * Otherwise, ethtool may not work correctly. See issue #22538.
2228          * When udevd is not running, read the value when the interface is detected. */
2229         if (udev_available() && !link->dev)
2230                 return 0;
2231
2232         link->ethtool_driver_read = true;
2233
2234         r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2235         if (r < 0) {
2236                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2237                 return 0;
2238         }
2239
2240         log_link_debug(link, "Found driver: %s", strna(link->driver));
2241
2242         if (streq_ptr(link->driver, "dsa")) {
2243                 uint32_t dsa_master_ifindex = 0;
2244
2245                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2246                 if (r < 0 && r != -ENODATA)
2247                         return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2248
2249                 if (dsa_master_ifindex > INT_MAX) {
2250                         log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2251                                        dsa_master_ifindex);
2252                         dsa_master_ifindex = 0;
2253                 }
2254
2255                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2256         }
2257
2258         return 1; /* needs reconfigure */
2259 }
2260
2261 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2262         int r;
2263
2264         assert(link);
2265         assert(link->manager);
2266         assert(message);
2267
2268         if (link->ethtool_permanent_hw_addr_read)
2269                 return 0;
2270
2271         /* When udevd is running, read the permanent hardware address after the interface is
2272          * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2273          * When udevd is not running, read the value when the interface is detected. */
2274         if (udev_available() && !link->dev)
2275                 return 0;
2276
2277         /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2278         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2279         if (r == -ENODATA)
2280                 return 0;
2281         if (r < 0)
2282                 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2283
2284         link->ethtool_permanent_hw_addr_read = true;
2285
2286         r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2287         if (r < 0)
2288                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2289
2290         return 0;
2291 }
2292
2293 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2294         int r;
2295
2296         assert(link);
2297         assert(link->manager);
2298         assert(message);
2299
2300         if (link->permanent_hw_addr.length > 0)
2301                 return 0;
2302
2303         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2304         if (r < 0) {
2305                 if (r != -ENODATA)
2306                         return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2307
2308                 /* Fallback to ethtool for older kernels. */
2309                 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2310                 if (r < 0)
2311                         return r;
2312         }
2313
2314         if (link->permanent_hw_addr.length > 0)
2315                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2316
2317         return 1; /* needs reconfigure */
2318 }
2319
2320 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2321         struct hw_addr_data addr;
2322         int r;
2323
2324         assert(link);
2325         assert(message);
2326
2327         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2328         if (r < 0 && r != -ENODATA)
2329                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2330
2331         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2332         if (r == -ENODATA)
2333                 return 0;
2334         if (r < 0)
2335                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2336
2337         if (hw_addr_equal(&link->hw_addr, &addr))
2338                 return 0;
2339
2340         if (link->hw_addr.length == 0)
2341                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2342         else {
2343                 log_link_debug(link, "Hardware address is changed: %s %s %s",
2344                                HW_ADDR_TO_STR(&link->hw_addr),
2345                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2346                                HW_ADDR_TO_STR(&addr));
2347
2348                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2349         }
2350
2351         link->hw_addr = addr;
2352
2353         if (!hw_addr_is_null(&link->hw_addr)) {
2354                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2355                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2356                         /* bonding master and its slaves have the same hardware address. */
2357                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2358                 if (r < 0)
2359                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2360         }
2361
2362         r = ipv4acd_update_mac(link);
2363         if (r < 0)
2364                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2365
2366         r = ipv4ll_update_mac(link);
2367         if (r < 0)
2368                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2369
2370         r = dhcp4_update_mac(link);
2371         if (r < 0)
2372                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2373
2374         r = dhcp6_update_mac(link);
2375         if (r < 0)
2376                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2377
2378         r = radv_update_mac(link);
2379         if (r < 0)
2380                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2381
2382         if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2383                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2384                 if (r < 0)
2385                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2386         }
2387
2388         if (link->lldp_rx) {
2389                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2390                 if (r < 0)
2391                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2392         }
2393
2394         if (link->lldp_tx) {
2395                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2396                 if (r < 0)
2397                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2398         }
2399
2400         return 1; /* needs reconfigure */
2401 }
2402
2403 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2404         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2405         int r;
2406
2407         assert(link);
2408         assert(message);
2409
2410         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2411         if (r == -ENODATA)
2412                 return 0;
2413         if (r < 0)
2414                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2415         if (mtu == 0)
2416                 return 0;
2417
2418         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2419         if (r < 0 && r != -ENODATA)
2420                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2421
2422         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2423         if (r < 0 && r != -ENODATA)
2424                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2425
2426         if (max_mtu == 0)
2427                 max_mtu = UINT32_MAX;
2428
2429         link->min_mtu = min_mtu;
2430         link->max_mtu = max_mtu;
2431
2432         if (link->original_mtu == 0) {
2433                 link->original_mtu = mtu;
2434                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2435                                link->original_mtu, link->min_mtu, link->max_mtu);
2436         }
2437
2438         if (link->mtu == mtu)
2439                 return 0;
2440
2441         if (link->mtu != 0)
2442                 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2443                                link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2444                                link->min_mtu, link->max_mtu);
2445
2446         link->mtu = mtu;
2447
2448         if (link->dhcp_client) {
2449                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2450                 if (r < 0)
2451                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2452         }
2453
2454         if (link->radv) {
2455                 r = sd_radv_set_mtu(link->radv, link->mtu);
2456                 if (r < 0)
2457                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2458         }
2459
2460         return 0;
2461 }
2462
2463 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2464         _cleanup_strv_free_ char **altnames = NULL;
2465         int r;
2466
2467         assert(link);
2468         assert(message);
2469
2470         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2471         if (r == -ENODATA)
2472                 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2473                  * interface has no alternative name. */
2474                 return 0;
2475         if (r < 0)
2476                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2477
2478         if (strv_equal(altnames, link->alternative_names))
2479                 return 0;
2480
2481         STRV_FOREACH(n, link->alternative_names)
2482                 hashmap_remove(link->manager->links_by_name, *n);
2483
2484         strv_free_and_replace(link->alternative_names, altnames);
2485
2486         STRV_FOREACH(n, link->alternative_names) {
2487                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2488                 if (r < 0)
2489                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2490         }
2491
2492         return 1; /* needs reconfigure */
2493 }
2494
2495 static int link_update_name(Link *link, sd_netlink_message *message) {
2496         char ifname_from_index[IF_NAMESIZE];
2497         const char *ifname;
2498         int r;
2499
2500         assert(link);
2501         assert(message);
2502
2503         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2504         if (r == -ENODATA)
2505                 /* Hmm?? But ok. */
2506                 return 0;
2507         if (r < 0)
2508                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2509
2510         if (streq(ifname, link->ifname))
2511                 return 0;
2512
2513         r = format_ifname(link->ifindex, ifname_from_index);
2514         if (r < 0)
2515                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2516
2517         if (!streq(ifname, ifname_from_index)) {
2518                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2519                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2520                                ifname, ifname_from_index);
2521                 return 0;
2522         }
2523
2524         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2525
2526         hashmap_remove(link->manager->links_by_name, link->ifname);
2527
2528         r = free_and_strdup(&link->ifname, ifname);
2529         if (r < 0)
2530                 return log_oom_debug();
2531
2532         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2533         if (r < 0)
2534                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2535
2536         if (link->dhcp_client) {
2537                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2538                 if (r < 0)
2539                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2540         }
2541
2542         if (link->dhcp6_client) {
2543                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2544                 if (r < 0)
2545                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2546         }
2547
2548         if (link->ndisc) {
2549                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2550                 if (r < 0)
2551                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2552         }
2553
2554         if (link->dhcp_server) {
2555                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2556                 if (r < 0)
2557                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2558         }
2559
2560         if (link->radv) {
2561                 r = sd_radv_set_ifname(link->radv, link->ifname);
2562                 if (r < 0)
2563                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2564         }
2565
2566         if (link->lldp_rx) {
2567                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2568                 if (r < 0)
2569                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2570         }
2571
2572         if (link->lldp_tx) {
2573                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2574                 if (r < 0)
2575                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2576         }
2577
2578         if (link->ipv4ll) {
2579                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2580                 if (r < 0)
2581                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2582         }
2583
2584         r = ipv4acd_set_ifname(link);
2585         if (r < 0)
2586                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2587
2588         return 1; /* needs reconfigure */
2589 }
2590
2591 static int link_update(Link *link, sd_netlink_message *message) {
2592         bool needs_reconfigure = false;
2593         int r;
2594
2595         assert(link);
2596         assert(message);
2597
2598         r = link_update_name(link, message);
2599         if (r < 0)
2600                 return r;
2601         needs_reconfigure = needs_reconfigure || r > 0;
2602
2603         r = link_update_alternative_names(link, message);
2604         if (r < 0)
2605                 return r;
2606         needs_reconfigure = needs_reconfigure || r > 0;
2607
2608         r = link_update_mtu(link, message);
2609         if (r < 0)
2610                 return r;
2611
2612         r = link_update_driver(link, message);
2613         if (r < 0)
2614                 return r;
2615         needs_reconfigure = needs_reconfigure || r > 0;
2616
2617         r = link_update_permanent_hardware_address(link, message);
2618         if (r < 0)
2619                 return r;
2620         needs_reconfigure = needs_reconfigure || r > 0;
2621
2622         r = link_update_hardware_address(link, message);
2623         if (r < 0)
2624                 return r;
2625         needs_reconfigure = needs_reconfigure || r > 0;
2626
2627         r = link_update_master(link, message);
2628         if (r < 0)
2629                 return r;
2630
2631         r = link_update_ipv6ll_addrgen_mode(link, message);
2632         if (r < 0)
2633                 return r;
2634
2635         r = link_update_flags(link, message);
2636         if (r < 0)
2637                 return r;
2638
2639         r = link_update_bridge_vlan(link, message);
2640         if (r < 0)
2641                 return r;
2642
2643         return needs_reconfigure;
2644 }
2645
2646 static Link *link_drop_or_unref(Link *link) {
2647         if (!link)
2648                 return NULL;
2649         if (!link->manager)
2650                 return link_unref(link);
2651         return link_drop(link);
2652 }
2653
2654 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2655
2656 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2657         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2658         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2659         unsigned short iftype;
2660         int r, ifindex;
2661
2662         assert(manager);
2663         assert(message);
2664         assert(ret);
2665
2666         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2667         if (r < 0)
2668                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2669         else if (ifindex <= 0)
2670                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2671
2672         r = sd_rtnl_message_link_get_type(message, &iftype);
2673         if (r < 0)
2674                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2675
2676         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2677         if (r < 0)
2678                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2679
2680         /* check for link kind */
2681         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2682         if (r >= 0) {
2683                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2684                 if (r < 0 && r != -ENODATA)
2685                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2686                 r = sd_netlink_message_exit_container(message);
2687                 if (r < 0)
2688                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2689         }
2690
2691         if (!manager->test_mode) {
2692                 /* Do not update state files when running in test mode. */
2693                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2694                         return log_oom_debug();
2695
2696                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2697                         return log_oom_debug();
2698
2699                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2700                         return log_oom_debug();
2701         }
2702
2703         link = new(Link, 1);
2704         if (!link)
2705                 return -ENOMEM;
2706
2707         *link = (Link) {
2708                 .n_ref = 1,
2709                 .state = LINK_STATE_PENDING,
2710                 .online_state = _LINK_ONLINE_STATE_INVALID,
2711                 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2712                 .ifindex = ifindex,
2713                 .iftype = iftype,
2714                 .ifname = TAKE_PTR(ifname),
2715                 .kind = TAKE_PTR(kind),
2716
2717                 .bridge_vlan_pvid = UINT16_MAX,
2718
2719                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2720
2721                 .state_file = TAKE_PTR(state_file),
2722                 .lease_file = TAKE_PTR(lease_file),
2723                 .lldp_file = TAKE_PTR(lldp_file),
2724
2725                 .n_dns = UINT_MAX,
2726                 .dns_default_route = -1,
2727                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2728                 .mdns = _RESOLVE_SUPPORT_INVALID,
2729                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2730                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2731         };
2732
2733         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2734         if (r < 0)
2735                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2736
2737         link->manager = manager;
2738
2739         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2740         if (r < 0)
2741                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2742
2743         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2744                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2745
2746         /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2747          * message arrived too early. Request the wireless link information again.
2748          */
2749         if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2750                 r = link_get_wlan_interface(link);
2751                 if (r < 0)
2752                         log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2753         }
2754
2755         *ret = TAKE_PTR(link);
2756         return 0;
2757 }
2758
2759 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2760         Link *link = NULL;
2761         NetDev *netdev = NULL;
2762         uint16_t type;
2763         const char *name;
2764         int r, ifindex;
2765
2766         assert(rtnl);
2767         assert(message);
2768         assert(manager);
2769
2770         if (sd_netlink_message_is_error(message)) {
2771                 r = sd_netlink_message_get_errno(message);
2772                 if (r < 0)
2773                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2774
2775                 return 0;
2776         }
2777
2778         r = sd_netlink_message_get_type(message, &type);
2779         if (r < 0) {
2780                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2781                 return 0;
2782         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2783                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2784                 return 0;
2785         }
2786
2787         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2788         if (r < 0) {
2789                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2790                 return 0;
2791         } else if (ifindex <= 0) {
2792                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2793                 return 0;
2794         }
2795
2796         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2797         if (r < 0) {
2798                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2799                 return 0;
2800         }
2801
2802         (void) link_get_by_index(manager, ifindex, &link);
2803         (void) netdev_get(manager, name, &netdev);
2804
2805         switch (type) {
2806         case RTM_NEWLINK:
2807                 if (netdev) {
2808                         /* netdev exists, so make sure the ifindex matches */
2809                         r = netdev_set_ifindex(netdev, message);
2810                         if (r < 0) {
2811                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2812                                 return 0;
2813                         }
2814                 }
2815
2816                 if (!link) {
2817                         /* link is new, so add it */
2818                         r = link_new(manager, message, &link);
2819                         if (r < 0) {
2820                                 log_warning_errno(r, "Could not process new link message: %m");
2821                                 return 0;
2822                         }
2823
2824                         r = link_update(link, message);
2825                         if (r < 0) {
2826                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2827                                 link_enter_failed(link);
2828                                 return 0;
2829                         }
2830
2831                         r = link_check_initialized(link);
2832                         if (r < 0) {
2833                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2834                                 link_enter_failed(link);
2835                                 return 0;
2836                         }
2837                 } else {
2838                         r = link_update(link, message);
2839                         if (r < 0) {
2840                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2841                                 link_enter_failed(link);
2842                                 return 0;
2843                         }
2844                         if (r > 0) {
2845                                 r = link_reconfigure_impl(link, /* force = */ false);
2846                                 if (r < 0) {
2847                                         log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2848                                         link_enter_failed(link);
2849                                         return 0;
2850                                 }
2851                         }
2852                 }
2853                 break;
2854
2855         case RTM_DELLINK:
2856                 link_drop(link);
2857                 netdev_drop(netdev);
2858                 break;
2859
2860         default:
2861                 assert_not_reached();
2862         }
2863
2864         return 1;
2865 }
2866
2867 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2868         uint16_t message_type;
2869         int r;
2870
2871         assert(m);
2872         assert(link);
2873         assert(error_msg);
2874
2875         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2876                 return 0;
2877
2878         r = sd_netlink_message_get_errno(m);
2879         if (r < 0) {
2880                 log_link_message_warning_errno(link, m, r, error_msg);
2881                 link_enter_failed(link);
2882                 return 0;
2883         }
2884
2885         r = sd_netlink_message_get_type(m, &message_type);
2886         if (r < 0) {
2887                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2888                 return 0;
2889         }
2890         if (message_type != RTM_NEWLINK) {
2891                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2892                 return 0;
2893         }
2894
2895         r = link_update(link, m);
2896         if (r < 0) {
2897                 link_enter_failed(link);
2898                 return 0;
2899         }
2900
2901         return 1;
2902 }
2903
2904 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2905         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2906         int r;
2907
2908         assert(link);
2909         assert(link->manager);
2910         assert(link->manager->rtnl);
2911         assert(callback);
2912
2913         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2914         if (r < 0)
2915                 return r;
2916
2917         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2918                                link_netlink_destroy_callback, link);
2919         if (r < 0)
2920                 return r;
2921
2922         link_ref(link);
2923         return 0;
2924 }
2925
2926 static const char* const link_state_table[_LINK_STATE_MAX] = {
2927         [LINK_STATE_PENDING]     = "pending",
2928         [LINK_STATE_INITIALIZED] = "initialized",
2929         [LINK_STATE_CONFIGURING] = "configuring",
2930         [LINK_STATE_CONFIGURED]  = "configured",
2931         [LINK_STATE_UNMANAGED]   = "unmanaged",
2932         [LINK_STATE_FAILED]      = "failed",
2933         [LINK_STATE_LINGER]      = "linger",
2934 };
2935
2936 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2937
2938 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2939         _cleanup_free_ char *str = NULL;
2940         static const char* map[] = {
2941                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2942                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid. */
2943                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2944                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2945                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2946                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2947                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2948                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2949                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2950                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2951                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2952                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2953                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast. */
2954                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2955                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2956                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2957                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2958                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2959                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2960         };
2961
2962         assert(ret);
2963
2964         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2965                 if (FLAGS_SET(flags, 1 << i) && map[i])
2966                         if (!strextend_with_separator(&str, ",", map[i]))
2967                                 return -ENOMEM;
2968
2969         *ret = TAKE_PTR(str);
2970         return 0;
2971 }
2972
2973 static const char * const kernel_operstate_table[] = {
2974         [IF_OPER_UNKNOWN]        = "unknown",
2975         [IF_OPER_NOTPRESENT]     = "not-present",
2976         [IF_OPER_DOWN]           = "down",
2977         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2978         [IF_OPER_TESTING]        = "testing",
2979         [IF_OPER_DORMANT]        = "dormant",
2980         [IF_OPER_UP]             = "up",
2981 };
2982
2983 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);