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                 *ret = link->network->required_operstate_for_online;
  80         else if (link->iftype == ARPHRD_CAN)
  81                 *ret = (const LinkOperationalStateRange) {
  82                         .min = LINK_OPERSTATE_CARRIER,
  83                         .max = LINK_OPERSTATE_CARRIER,
  84                 };
  85         else
  86                 *ret = LINK_OPERSTATE_RANGE_DEFAULT;
  87 }
  88
  89 bool link_ipv6_enabled(Link *link) {
  90         assert(link);
  91
  92         if (!socket_ipv6_is_supported())
  93                 return false;
  94
  95         if (link->iftype == ARPHRD_CAN)
  96                 return false;
  97
  98         if (!link->network)
  99                 return false;
 100
 101         if (link->network->bond)
 102                 return false;
 103
 104         if (link_may_have_ipv6ll(link, /* check_multicast = */ false))
 105                 return true;
 106
 107         if (network_has_static_ipv6_configurations(link->network))
 108                 return true;
 109
 110         return false;
 111 }
 112
 113 bool link_has_ipv6_connectivity(Link *link) {
 114         LinkAddressState ipv6_address_state;
 115
 116         assert(link);
 117
 118         link_get_address_states(link, NULL, &ipv6_address_state, NULL);
 119
 120         switch (ipv6_address_state) {
 121         case LINK_ADDRESS_STATE_ROUTABLE:
 122                 /* If the interface has a routable IPv6 address, then we assume yes. */
 123                 return true;
 124
 125         case LINK_ADDRESS_STATE_DEGRADED:
 126                 /* If the interface has only degraded IPv6 address (mostly, link-local address), then let's check
 127                  * there is an IPv6 default gateway. */
 128                 return link_has_default_gateway(link, AF_INET6);
 129
 130         case LINK_ADDRESS_STATE_OFF:
 131                 /* No IPv6 address. */
 132                 return false;
 133
 134         default:
 135                 assert_not_reached();
 136         }
 137 }
 138
 139 static bool link_is_ready_to_configure_one(Link *link, bool allow_unmanaged) {
 140         assert(link);
 141
 142         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
 143                 return false;
 144
 145         if (!link->network)
 146                 return allow_unmanaged;
 147
 148         if (!link->network->configure_without_carrier) {
 149                 if (link->set_flags_messages > 0)
 150                         return false;
 151
 152                 if (!link_has_carrier(link))
 153                         return false;
 154         }
 155
 156         if (link->set_link_messages > 0)
 157                 return false;
 158
 159         if (!link->activated)
 160                 return false;
 161
 162         return true;
 163 }
 164
 165 bool link_is_ready_to_configure(Link *link, bool allow_unmanaged) {
 166         return check_ready_for_all_sr_iov_ports(link, allow_unmanaged, link_is_ready_to_configure_one);
 167 }
 168
 169 void link_ntp_settings_clear(Link *link) {
 170         link->ntp = strv_free(link->ntp);
 171 }
 172
 173 void link_dns_settings_clear(Link *link) {
 174         if (link->n_dns != UINT_MAX)
 175                 for (unsigned i = 0; i < link->n_dns; i++)
 176                         in_addr_full_free(link->dns[i]);
 177         link->dns = mfree(link->dns);
 178         link->n_dns = UINT_MAX;
 179
 180         link->search_domains = ordered_set_free(link->search_domains);
 181         link->route_domains = ordered_set_free(link->route_domains);
 182
 183         link->dns_default_route = -1;
 184         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 185         link->mdns = _RESOLVE_SUPPORT_INVALID;
 186         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 187         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 188
 189         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 190 }
 191
 192 static void link_free_engines(Link *link) {
 193         if (!link)
 194                 return;
 195
 196         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 197
 198         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 199         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 200         link->dhcp4_6rd_tunnel_name = mfree(link->dhcp4_6rd_tunnel_name);
 201
 202         link->lldp_rx = sd_lldp_rx_unref(link->lldp_rx);
 203         link->lldp_tx = sd_lldp_tx_unref(link->lldp_tx);
 204
 205         link->ipv4acd_by_address = hashmap_free(link->ipv4acd_by_address);
 206
 207         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 208
 209         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 210         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 211
 212         link->ndisc = sd_ndisc_unref(link->ndisc);
 213         link->ndisc_expire = sd_event_source_disable_unref(link->ndisc_expire);
 214         ndisc_flush(link);
 215
 216         link->radv = sd_radv_unref(link->radv);
 217 }
 218
 219 static Link *link_free(Link *link) {
 220         assert(link);
 221
 222         link_ntp_settings_clear(link);
 223         link_dns_settings_clear(link);
 224
 225         link->routes = set_free(link->routes);
 226         link->neighbors = set_free(link->neighbors);
 227         link->addresses = set_free(link->addresses);
 228         link->qdiscs = set_free(link->qdiscs);
 229         link->tclasses = set_free(link->tclasses);
 230
 231         link->dhcp_pd_prefixes = set_free(link->dhcp_pd_prefixes);
 232
 233         link_free_engines(link);
 234
 235         set_free(link->sr_iov_virt_port_ifindices);
 236         free(link->ifname);
 237         strv_free(link->alternative_names);
 238         free(link->kind);
 239         free(link->ssid);
 240         free(link->previous_ssid);
 241         free(link->driver);
 242
 243         unlink_and_free(link->lease_file);
 244         unlink_and_free(link->lldp_file);
 245         unlink_and_free(link->state_file);
 246
 247         sd_device_unref(link->dev);
 248         netdev_unref(link->netdev);
 249
 250         hashmap_free(link->bound_to_links);
 251         hashmap_free(link->bound_by_links);
 252
 253         set_free_with_destructor(link->slaves, link_unref);
 254
 255         network_unref(link->network);
 256
 257         sd_event_source_disable_unref(link->carrier_lost_timer);
 258
 259         return mfree(link);
 260 }
 261
 262 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 263
 264 int link_get_by_index(Manager *m, int ifindex, Link **ret) {
 265         Link *link;
 266
 267         assert(m);
 268
 269         if (ifindex <= 0)
 270                 return -EINVAL;
 271
 272         link = hashmap_get(m->links_by_index, INT_TO_PTR(ifindex));
 273         if (!link)
 274                 return -ENODEV;
 275
 276         if (ret)
 277                 *ret = link;
 278         return 0;
 279 }
 280
 281 int link_get_by_name(Manager *m, const char *ifname, Link **ret) {
 282         Link *link;
 283
 284         assert(m);
 285         assert(ifname);
 286
 287         link = hashmap_get(m->links_by_name, ifname);
 288         if (!link)
 289                 return -ENODEV;
 290
 291         if (ret)
 292                 *ret = link;
 293         return 0;
 294 }
 295
 296 int link_get_by_hw_addr(Manager *m, const struct hw_addr_data *hw_addr, Link **ret) {
 297         Link *link;
 298
 299         assert(m);
 300         assert(hw_addr);
 301
 302         link = hashmap_get(m->links_by_hw_addr, hw_addr);
 303         if (!link)
 304                 return -ENODEV;
 305
 306         if (ret)
 307                 *ret = link;
 308         return 0;
 309 }
 310
 311 int link_get_master(Link *link, Link **ret) {
 312         assert(link);
 313         assert(link->manager);
 314         assert(ret);
 315
 316         if (link->master_ifindex <= 0 || link->master_ifindex == link->ifindex)
 317                 return -ENODEV;
 318
 319         return link_get_by_index(link->manager, link->master_ifindex, ret);
 320 }
 321
 322 void link_set_state(Link *link, LinkState state) {
 323         assert(link);
 324
 325         if (link->state == state)
 326                 return;
 327
 328         log_link_debug(link, "State changed: %s -> %s",
 329                        link_state_to_string(link->state),
 330                        link_state_to_string(state));
 331
 332         link->state = state;
 333
 334         link_send_changed(link, "AdministrativeState", NULL);
 335         link_dirty(link);
 336 }
 337
 338 int link_stop_engines(Link *link, bool may_keep_dhcp) {
 339         int r, ret = 0;
 340
 341         assert(link);
 342         assert(link->manager);
 343         assert(link->manager->event);
 344
 345         bool keep_dhcp = may_keep_dhcp &&
 346                          link->network &&
 347                          !link->network->dhcp_send_decline && /* IPv4 ACD for the DHCPv4 address is running. */
 348                          (link->manager->restarting ||
 349                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 350
 351         if (!keep_dhcp) {
 352                 r = sd_dhcp_client_stop(link->dhcp_client);
 353                 if (r < 0)
 354                         RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 client: %m"));
 355         }
 356
 357         r = sd_dhcp_server_stop(link->dhcp_server);
 358         if (r < 0)
 359                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv4 server: %m"));
 360
 361         r = sd_lldp_rx_stop(link->lldp_rx);
 362         if (r < 0)
 363                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Rx: %m"));
 364
 365         r = sd_lldp_tx_stop(link->lldp_tx);
 366         if (r < 0)
 367                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop LLDP Tx: %m"));
 368
 369         r = sd_ipv4ll_stop(link->ipv4ll);
 370         if (r < 0)
 371                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 link-local: %m"));
 372
 373         r = ipv4acd_stop(link);
 374         if (r < 0)
 375                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv4 ACD client: %m"));
 376
 377         r = sd_dhcp6_client_stop(link->dhcp6_client);
 378         if (r < 0)
 379                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m"));
 380
 381         r = dhcp_pd_remove(link, /* only_marked = */ false);
 382         if (r < 0)
 383                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not remove DHCPv6 PD addresses and routes: %m"));
 384
 385         r = ndisc_stop(link);
 386         if (r < 0)
 387                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Discovery: %m"));
 388
 389         ndisc_flush(link);
 390
 391         r = sd_radv_stop(link->radv);
 392         if (r < 0)
 393                 RET_GATHER(ret, log_link_warning_errno(link, r, "Could not stop IPv6 Router Advertisement: %m"));
 394
 395         return ret;
 396 }
 397
 398 void link_enter_failed(Link *link) {
 399         int r;
 400
 401         assert(link);
 402
 403         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 404                 return;
 405
 406         log_link_warning(link, "Failed");
 407
 408         link_set_state(link, LINK_STATE_FAILED);
 409
 410         if (!ratelimit_below(&link->automatic_reconfigure_ratelimit)) {
 411                 log_link_warning(link, "The interface entered the failed state frequently, refusing to reconfigure it automatically.");
 412                 goto stop;
 413         }
 414
 415         log_link_info(link, "Trying to reconfigure the interface.");
 416         r = link_reconfigure(link, /* force = */ true);
 417         if (r < 0) {
 418                 log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
 419                 goto stop;
 420         }
 421
 422         return;
 423
 424 stop:
 425         (void) link_stop_engines(link, /* may_keep_dhcp = */ false);
 426 }
 427
 428 void link_check_ready(Link *link) {
 429         Address *a;
 430
 431         assert(link);
 432
 433         if (link->state == LINK_STATE_CONFIGURED)
 434                 return;
 435
 436         if (link->state != LINK_STATE_CONFIGURING)
 437                 return (void) log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
 438
 439         if (!link->network)
 440                 return (void) log_link_debug(link, "%s(): link is unmanaged.", __func__);
 441
 442         if (!link->tc_configured)
 443                 return (void) log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
 444
 445         if (link->set_link_messages > 0)
 446                 return (void) log_link_debug(link, "%s(): link layer is configuring.", __func__);
 447
 448         if (!link->activated)
 449                 return (void) log_link_debug(link, "%s(): link is not activated.", __func__);
 450
 451         if (link->iftype == ARPHRD_CAN)
 452                 /* let's shortcut things for CAN which doesn't need most of checks below. */
 453                 goto ready;
 454
 455         if (!link->stacked_netdevs_created)
 456                 return (void) log_link_debug(link, "%s(): stacked netdevs are not created.", __func__);
 457
 458         if (!link->static_addresses_configured)
 459                 return (void) log_link_debug(link, "%s(): static addresses are not configured.", __func__);
 460
 461         if (!link->static_address_labels_configured)
 462                 return (void) log_link_debug(link, "%s(): static address labels are not configured.", __func__);
 463
 464         if (!link->static_bridge_fdb_configured)
 465                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 466
 467         if (!link->static_bridge_mdb_configured)
 468                 return (void) log_link_debug(link, "%s(): static bridge MDB entries are not configured.", __func__);
 469
 470         if (!link->static_ipv6_proxy_ndp_configured)
 471                 return (void) log_link_debug(link, "%s(): static IPv6 proxy NDP addresses are not configured.", __func__);
 472
 473         if (!link->static_neighbors_configured)
 474                 return (void) log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
 475
 476         if (!link->static_nexthops_configured)
 477                 return (void) log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
 478
 479         if (!link->static_routes_configured)
 480                 return (void) log_link_debug(link, "%s(): static routes are not configured.", __func__);
 481
 482         if (!link->static_routing_policy_rules_configured)
 483                 return (void) log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
 484
 485         if (!link->sr_iov_configured)
 486                 return (void) log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
 487
 488         /* IPv6LL is assigned after the link gains its carrier. */
 489         if (!link->network->configure_without_carrier &&
 490             link_ipv6ll_enabled(link) &&
 491             !in6_addr_is_set(&link->ipv6ll_address))
 492                 return (void) log_link_debug(link, "%s(): IPv6LL is not configured yet.", __func__);
 493
 494         /* All static addresses must be ready. */
 495         bool has_static_address = false;
 496         SET_FOREACH(a, link->addresses) {
 497                 if (a->source != NETWORK_CONFIG_SOURCE_STATIC)
 498                         continue;
 499                 if (!address_is_ready(a))
 500                         return (void) log_link_debug(link, "%s(): static address %s is not ready.", __func__,
 501                                                      IN_ADDR_PREFIX_TO_STRING(a->family, &a->in_addr, a->prefixlen));
 502                 has_static_address = true;
 503         }
 504
 505         /* If at least one static address is requested, do not request that dynamic addressing protocols are finished. */
 506         if (has_static_address)
 507                 goto ready;
 508
 509         /* If no dynamic addressing protocol enabled, assume the interface is ready.
 510          * Note, ignore NDisc when ConfigureWithoutCarrier= is enabled, as IPv6AcceptRA= is enabled by default. */
 511         if (!link_ipv4ll_enabled(link) && !link_dhcp4_enabled(link) &&
 512             !link_dhcp6_enabled(link) && !link_dhcp_pd_is_enabled(link) &&
 513             (link->network->configure_without_carrier || !link_ipv6_accept_ra_enabled(link)))
 514                 goto ready;
 515
 516         bool ipv4ll_ready =
 517                 link_ipv4ll_enabled(link) && link->ipv4ll_address_configured &&
 518                 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_IPV4LL);
 519         bool dhcp4_ready =
 520                 link_dhcp4_enabled(link) && link->dhcp4_configured &&
 521                 link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP4);
 522         bool dhcp6_ready =
 523                 link_dhcp6_enabled(link) && link->dhcp6_configured &&
 524                 (!link->network->dhcp6_use_address ||
 525                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP6));
 526         bool dhcp_pd_ready =
 527                 link_dhcp_pd_is_enabled(link) && link->dhcp_pd_configured &&
 528                 (!link->network->dhcp_pd_assign ||
 529                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_DHCP_PD));
 530         bool ndisc_ready =
 531                 link_ipv6_accept_ra_enabled(link) && link->ndisc_configured &&
 532                 (!link->network->ipv6_accept_ra_use_autonomous_prefix ||
 533                  link_check_addresses_ready(link, NETWORK_CONFIG_SOURCE_NDISC));
 534
 535         /* If the uplink for PD is self, then request the corresponding DHCP protocol is also ready. */
 536         if (dhcp_pd_is_uplink(link, link, /* accept_auto = */ false)) {
 537                 if (link_dhcp4_enabled(link) && link->network->dhcp_use_6rd &&
 538                     sd_dhcp_lease_has_6rd(link->dhcp_lease)) {
 539                         if (!dhcp4_ready)
 540                                 return (void) log_link_debug(link, "%s(): DHCPv4 6rd prefix is assigned, but DHCPv4 protocol is not finished yet.", __func__);
 541                         if (!dhcp_pd_ready)
 542                                 return (void) log_link_debug(link, "%s(): DHCPv4 is finished, but prefix acquired by DHCPv4-6rd is not assigned yet.", __func__);
 543                 }
 544
 545                 if (link_dhcp6_enabled(link) && link->network->dhcp6_use_pd_prefix &&
 546                     sd_dhcp6_lease_has_pd_prefix(link->dhcp6_lease)) {
 547                         if (!dhcp6_ready)
 548                                 return (void) log_link_debug(link, "%s(): DHCPv6 IA_PD prefix is assigned, but DHCPv6 protocol is not finished yet.", __func__);
 549                         if (!dhcp_pd_ready)
 550                                 return (void) log_link_debug(link, "%s(): DHCPv6 is finished, but prefix acquired by DHCPv6 IA_PD is not assigned yet.", __func__);
 551                 }
 552         }
 553
 554         /* At least one dynamic addressing protocol is finished. */
 555         if (!ipv4ll_ready && !dhcp4_ready && !dhcp6_ready && !dhcp_pd_ready && !ndisc_ready)
 556                 return (void) log_link_debug(link, "%s(): dynamic addressing protocols are enabled but none of them finished yet.", __func__);
 557
 558         log_link_debug(link, "%s(): IPv4LL:%s DHCPv4:%s DHCPv6:%s DHCP-PD:%s NDisc:%s",
 559                        __func__,
 560                        yes_no(ipv4ll_ready),
 561                        yes_no(dhcp4_ready),
 562                        yes_no(dhcp6_ready),
 563                        yes_no(dhcp_pd_ready),
 564                        yes_no(ndisc_ready));
 565
 566 ready:
 567         link_set_state(link, LINK_STATE_CONFIGURED);
 568 }
 569
 570 static int link_request_static_configs(Link *link) {
 571         int r;
 572
 573         assert(link);
 574         assert(link->network);
 575         assert(link->state != _LINK_STATE_INVALID);
 576
 577         r = link_request_static_addresses(link);
 578         if (r < 0)
 579                 return r;
 580
 581         r = link_request_static_address_labels(link);
 582         if (r < 0)
 583                 return r;
 584
 585         r = link_request_static_bridge_fdb(link);
 586         if (r < 0)
 587                 return r;
 588
 589         r = link_request_static_bridge_mdb(link);
 590         if (r < 0)
 591                 return r;
 592
 593         r = link_request_static_ipv6_proxy_ndp_addresses(link);
 594         if (r < 0)
 595                 return r;
 596
 597         r = link_request_static_neighbors(link);
 598         if (r < 0)
 599                 return r;
 600
 601         r = link_request_static_nexthops(link, false);
 602         if (r < 0)
 603                 return r;
 604
 605         r = link_request_static_routes(link, false);
 606         if (r < 0)
 607                 return r;
 608
 609         r = link_request_static_routing_policy_rules(link);
 610         if (r < 0)
 611                 return r;
 612
 613         return 0;
 614 }
 615
 616 static int link_request_stacked_netdevs(Link *link) {
 617         NetDev *netdev;
 618         int r;
 619
 620         assert(link);
 621
 622         link->stacked_netdevs_created = false;
 623
 624         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 625                 r = link_request_stacked_netdev(link, netdev);
 626                 if (r < 0)
 627                         return r;
 628         }
 629
 630         if (link->create_stacked_netdev_messages == 0) {
 631                 link->stacked_netdevs_created = true;
 632                 link_check_ready(link);
 633         }
 634
 635         return 0;
 636 }
 637
 638 static int link_acquire_dynamic_ipv6_conf(Link *link) {
 639         int r;
 640
 641         assert(link);
 642
 643         r = radv_start(link);
 644         if (r < 0)
 645                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Advertisement engine: %m");
 646
 647         r = ndisc_start(link);
 648         if (r < 0)
 649                 return log_link_warning_errno(link, r, "Failed to start IPv6 Router Discovery: %m");
 650
 651         r = dhcp6_start(link);
 652         if (r < 0)
 653                 return log_link_warning_errno(link, r, "Failed to start DHCPv6 client: %m");
 654
 655         return 0;
 656 }
 657
 658 static int link_acquire_dynamic_ipv4_conf(Link *link) {
 659         int r;
 660
 661         assert(link);
 662         assert(link->manager);
 663         assert(link->manager->event);
 664
 665         if (link->dhcp_client) {
 666                 r = dhcp4_start(link);
 667                 if (r < 0)
 668                         return log_link_warning_errno(link, r, "Failed to start DHCPv4 client: %m");
 669
 670                 log_link_debug(link, "Acquiring DHCPv4 lease.");
 671
 672         } else if (link->ipv4ll) {
 673                 if (in4_addr_is_set(&link->network->ipv4ll_start_address)) {
 674                         r = sd_ipv4ll_set_address(link->ipv4ll, &link->network->ipv4ll_start_address);
 675                         if (r < 0)
 676                                 return log_link_warning_errno(link, r, "Could not set IPv4 link-local start address: %m");
 677                 }
 678
 679                 r = sd_ipv4ll_start(link->ipv4ll);
 680                 if (r < 0)
 681                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
 682
 683                 log_link_debug(link, "Acquiring IPv4 link-local address.");
 684         }
 685
 686         if (link->dhcp_server) {
 687                 r = sd_dhcp_server_start(link->dhcp_server);
 688                 if (r < 0)
 689                         return log_link_warning_errno(link, r, "Could not start DHCP server: %m");
 690         }
 691
 692         r = ipv4acd_start(link);
 693         if (r < 0)
 694                 return log_link_warning_errno(link, r, "Could not start IPv4 ACD client: %m");
 695
 696         return 0;
 697 }
 698
 699 static int link_acquire_dynamic_conf(Link *link) {
 700         int r;
 701
 702         assert(link);
 703         assert(link->network);
 704
 705         r = link_acquire_dynamic_ipv4_conf(link);
 706         if (r < 0)
 707                 return r;
 708
 709         if (in6_addr_is_set(&link->ipv6ll_address)) {
 710                 r = link_acquire_dynamic_ipv6_conf(link);
 711                 if (r < 0)
 712                         return r;
 713         }
 714
 715         if (!link_radv_enabled(link) || !link->network->dhcp_pd_announce) {
 716                 /* DHCPv6PD downstream does not require IPv6LL address. But may require RADV to be
 717                  * configured, and RADV may not be configured yet here. Only acquire subnet prefix when
 718                  * RADV is disabled, or the announcement of the prefix is disabled. Otherwise, the
 719                  * below will be called in radv_start(). */
 720                 r = dhcp_request_prefix_delegation(link);
 721                 if (r < 0)
 722                         return log_link_warning_errno(link, r, "Failed to request DHCP delegated subnet prefix: %m");
 723         }
 724
 725         if (link->lldp_tx) {
 726                 r = sd_lldp_tx_start(link->lldp_tx);
 727                 if (r < 0)
 728                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
 729         }
 730
 731         if (link->lldp_rx) {
 732                 r = sd_lldp_rx_start(link->lldp_rx);
 733                 if (r < 0)
 734                         return log_link_warning_errno(link, r, "Failed to start LLDP client: %m");
 735         }
 736
 737         return 0;
 738 }
 739
 740 int link_ipv6ll_gained(Link *link) {
 741         int r;
 742
 743         assert(link);
 744
 745         log_link_info(link, "Gained IPv6LL");
 746
 747         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 748                 return 0;
 749
 750         r = link_acquire_dynamic_ipv6_conf(link);
 751         if (r < 0)
 752                 return r;
 753
 754         link_check_ready(link);
 755         return 0;
 756 }
 757
 758 int link_handle_bound_to_list(Link *link) {
 759         bool required_up = false;
 760         bool link_is_up = false;
 761         Link *l;
 762
 763         assert(link);
 764
 765         /* If at least one interface in bound_to_links has carrier, then make this interface up.
 766          * If all interfaces in bound_to_links do not, then make this interface down. */
 767
 768         if (hashmap_isempty(link->bound_to_links))
 769                 return 0;
 770
 771         if (link->flags & IFF_UP)
 772                 link_is_up = true;
 773
 774         HASHMAP_FOREACH(l, link->bound_to_links)
 775                 if (link_has_carrier(l)) {
 776                         required_up = true;
 777                         break;
 778                 }
 779
 780         if (!required_up && link_is_up)
 781                 return link_request_to_bring_up_or_down(link, /* up = */ false);
 782         if (required_up && !link_is_up)
 783                 return link_request_to_bring_up_or_down(link, /* up = */ true);
 784
 785         return 0;
 786 }
 787
 788 static int link_handle_bound_by_list(Link *link) {
 789         Link *l;
 790         int r;
 791
 792         assert(link);
 793
 794         /* Update up or down state of interfaces which depend on this interface's carrier state. */
 795
 796         if (hashmap_isempty(link->bound_by_links))
 797                 return 0;
 798
 799         HASHMAP_FOREACH(l, link->bound_by_links) {
 800                 r = link_handle_bound_to_list(l);
 801                 if (r < 0)
 802                         return r;
 803         }
 804
 805         return 0;
 806 }
 807
 808 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
 809         int r;
 810
 811         assert(link);
 812         assert(carrier);
 813
 814         if (link == carrier)
 815                 return 0;
 816
 817         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
 818                 return 0;
 819
 820         r = hashmap_ensure_put(h, NULL, INT_TO_PTR(carrier->ifindex), carrier);
 821         if (r < 0)
 822                 return r;
 823
 824         link_dirty(link);
 825
 826         return 0;
 827 }
 828
 829 static int link_new_bound_by_list(Link *link) {
 830         Manager *m;
 831         Link *carrier;
 832         int r;
 833
 834         assert(link);
 835         assert(link->manager);
 836
 837         m = link->manager;
 838
 839         HASHMAP_FOREACH(carrier, m->links_by_index) {
 840                 if (!carrier->network)
 841                         continue;
 842
 843                 if (strv_isempty(carrier->network->bind_carrier))
 844                         continue;
 845
 846                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
 847                         r = link_put_carrier(link, carrier, &link->bound_by_links);
 848                         if (r < 0)
 849                                 return r;
 850                 }
 851         }
 852
 853         HASHMAP_FOREACH(carrier, link->bound_by_links) {
 854                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
 855                 if (r < 0)
 856                         return r;
 857         }
 858
 859         return 0;
 860 }
 861
 862 static int link_new_bound_to_list(Link *link) {
 863         Manager *m;
 864         Link *carrier;
 865         int r;
 866
 867         assert(link);
 868         assert(link->manager);
 869
 870         if (!link->network)
 871                 return 0;
 872
 873         if (strv_isempty(link->network->bind_carrier))
 874                 return 0;
 875
 876         m = link->manager;
 877
 878         HASHMAP_FOREACH(carrier, m->links_by_index) {
 879                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
 880                         r = link_put_carrier(link, carrier, &link->bound_to_links);
 881                         if (r < 0)
 882                                 return r;
 883                 }
 884         }
 885
 886         HASHMAP_FOREACH(carrier, link->bound_to_links) {
 887                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
 888                 if (r < 0)
 889                         return r;
 890         }
 891
 892         return 0;
 893 }
 894
 895 static void link_free_bound_to_list(Link *link) {
 896         bool updated = false;
 897         Link *bound_to;
 898
 899         assert(link);
 900
 901         while ((bound_to = hashmap_steal_first(link->bound_to_links))) {
 902                 updated = true;
 903
 904                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
 905                         link_dirty(bound_to);
 906         }
 907
 908         if (updated)
 909                 link_dirty(link);
 910 }
 911
 912 static void link_free_bound_by_list(Link *link) {
 913         bool updated = false;
 914         Link *bound_by;
 915
 916         assert(link);
 917
 918         while ((bound_by = hashmap_steal_first(link->bound_by_links))) {
 919                 updated = true;
 920
 921                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
 922                         link_dirty(bound_by);
 923                         link_handle_bound_to_list(bound_by);
 924                 }
 925         }
 926
 927         if (updated)
 928                 link_dirty(link);
 929 }
 930
 931 static int link_append_to_master(Link *link) {
 932         Link *master;
 933         int r;
 934
 935         assert(link);
 936
 937         /* - The link may have no master.
 938          * - RTM_NEWLINK message about master interface may not be received yet. */
 939         if (link_get_master(link, &master) < 0)
 940                 return 0;
 941
 942         r = set_ensure_put(&master->slaves, NULL, link);
 943         if (r <= 0)
 944                 return r;
 945
 946         link_ref(link);
 947         return 0;
 948 }
 949
 950 static void link_drop_from_master(Link *link) {
 951         Link *master;
 952
 953         assert(link);
 954
 955         if (!link->manager)
 956                 return;
 957
 958         if (link_get_master(link, &master) < 0)
 959                 return;
 960
 961         link_unref(set_remove(master->slaves, link));
 962 }
 963
 964 static int link_drop_requests(Link *link) {
 965         Request *req;
 966         int ret = 0;
 967
 968         assert(link);
 969         assert(link->manager);
 970
 971         ORDERED_SET_FOREACH(req, link->manager->request_queue) {
 972                 if (req->link != link)
 973                         continue;
 974
 975                 /* If the request is already called, but its reply is not received, then we need to
 976                  * drop the configuration (e.g. address) here. Note, if the configuration is known,
 977                  * it will be handled later by link_drop_foreign_addresses() or so. */
 978                 if (req->waiting_reply && link->state != LINK_STATE_LINGER)
 979                         switch (req->type) {
 980                         case REQUEST_TYPE_ADDRESS: {
 981                                 Address *address = ASSERT_PTR(req->userdata);
 982
 983                                 if (address_get(link, address, NULL) < 0)
 984                                         RET_GATHER(ret, address_remove(address, link));
 985                                 break;
 986                         }
 987                         case REQUEST_TYPE_NEIGHBOR: {
 988                                 Neighbor *neighbor = ASSERT_PTR(req->userdata);
 989
 990                                 if (neighbor_get(link, neighbor, NULL) < 0)
 991                                         RET_GATHER(ret, neighbor_remove(neighbor, link));
 992                                 break;
 993                         }
 994                         case REQUEST_TYPE_NEXTHOP: {
 995                                 NextHop *nexthop = ASSERT_PTR(req->userdata);
 996
 997                                 if (nexthop_get_by_id(link->manager, nexthop->id, NULL) < 0)
 998                                         RET_GATHER(ret, nexthop_remove(nexthop, link->manager));
 999                                 break;
1000                         }
1001                         default:
1002                                 ;
1003                         }
1004
1005                 request_detach(link->manager, req);
1006         }
1007
1008         return ret;
1009 }
1010
1011 static Link *link_drop(Link *link) {
1012         if (!link)
1013                 return NULL;
1014
1015         assert(link->manager);
1016
1017         link_set_state(link, LINK_STATE_LINGER);
1018
1019         /* Drop all references from other links and manager. Note that async netlink calls may have
1020          * references to the link, and they will be dropped when we receive replies. */
1021
1022         (void) link_drop_requests(link);
1023
1024         link_free_bound_to_list(link);
1025         link_free_bound_by_list(link);
1026
1027         link_clear_sr_iov_ifindices(link);
1028
1029         link_drop_from_master(link);
1030
1031         if (link->state_file)
1032                 (void) unlink(link->state_file);
1033
1034         link_clean(link);
1035
1036         STRV_FOREACH(n, link->alternative_names)
1037                 hashmap_remove(link->manager->links_by_name, *n);
1038         hashmap_remove(link->manager->links_by_name, link->ifname);
1039
1040         /* bonding master and its slaves have the same hardware address. */
1041         hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
1042
1043         /* The following must be called at last. */
1044         assert_se(hashmap_remove(link->manager->links_by_index, INT_TO_PTR(link->ifindex)) == link);
1045         return link_unref(link);
1046 }
1047
1048 static int link_drop_foreign_config(Link *link) {
1049         int r;
1050
1051         assert(link);
1052         assert(link->manager);
1053
1054         /* Drop foreign config, but ignore unmanaged, loopback, or critical interfaces. We do not want
1055          * to remove loopback address or addresses used for root NFS. */
1056
1057         if (IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
1058                 return 0;
1059         if (FLAGS_SET(link->flags, IFF_LOOPBACK))
1060                 return 0;
1061         if (link->network->keep_configuration == KEEP_CONFIGURATION_YES)
1062                 return 0;
1063
1064         r = link_drop_foreign_routes(link);
1065
1066         RET_GATHER(r, link_drop_foreign_nexthops(link));
1067         RET_GATHER(r, link_drop_foreign_addresses(link));
1068         RET_GATHER(r, link_drop_foreign_neighbors(link));
1069         RET_GATHER(r, manager_drop_foreign_routing_policy_rules(link->manager));
1070
1071         return r;
1072 }
1073
1074 static int link_drop_managed_config(Link *link) {
1075         int r;
1076
1077         assert(link);
1078         assert(link->manager);
1079
1080         r = link_drop_managed_routes(link);
1081
1082         RET_GATHER(r, link_drop_managed_nexthops(link));
1083         RET_GATHER(r, link_drop_managed_addresses(link));
1084         RET_GATHER(r, link_drop_managed_neighbors(link));
1085         RET_GATHER(r, link_drop_managed_routing_policy_rules(link));
1086
1087         return r;
1088 }
1089
1090 static void link_foreignize_config(Link *link) {
1091         assert(link);
1092         assert(link->manager);
1093
1094         link_foreignize_routes(link);
1095         link_foreignize_nexthops(link);
1096         link_foreignize_addresses(link);
1097         link_foreignize_neighbors(link);
1098         link_foreignize_routing_policy_rules(link);
1099 }
1100
1101 static int link_configure(Link *link) {
1102         int r;
1103
1104         assert(link);
1105         assert(link->network);
1106         assert(link->state == LINK_STATE_INITIALIZED);
1107
1108         link_set_state(link, LINK_STATE_CONFIGURING);
1109
1110         r = link_new_bound_to_list(link);
1111         if (r < 0)
1112                 return r;
1113
1114         r = link_request_traffic_control(link);
1115         if (r < 0)
1116                 return r;
1117
1118         r = link_configure_mtu(link);
1119         if (r < 0)
1120                 return r;
1121
1122         if (link->iftype == ARPHRD_CAN) {
1123                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1124                 r = link_request_to_set_can(link);
1125                 if (r < 0)
1126                         return r;
1127
1128                 return link_request_to_activate(link);
1129         }
1130
1131         r = link_request_sr_iov_vfs(link);
1132         if (r < 0)
1133                 return r;
1134
1135         r = link_set_sysctl(link);
1136         if (r < 0)
1137                 return r;
1138
1139         r = link_request_to_set_mac(link, /* allow_retry = */ true);
1140         if (r < 0)
1141                 return r;
1142
1143         r = link_request_to_set_ipoib(link);
1144         if (r < 0)
1145                 return r;
1146
1147         r = link_request_to_set_flags(link);
1148         if (r < 0)
1149                 return r;
1150
1151         r = link_request_to_set_group(link);
1152         if (r < 0)
1153                 return r;
1154
1155         r = link_request_to_set_addrgen_mode(link);
1156         if (r < 0)
1157                 return r;
1158
1159         r = link_request_to_set_master(link);
1160         if (r < 0)
1161                 return r;
1162
1163         r = link_request_stacked_netdevs(link);
1164         if (r < 0)
1165                 return r;
1166
1167         r = link_request_to_set_bond(link);
1168         if (r < 0)
1169                 return r;
1170
1171         r = link_request_to_set_bridge(link);
1172         if (r < 0)
1173                 return r;
1174
1175         r = link_request_to_set_bridge_vlan(link);
1176         if (r < 0)
1177                 return r;
1178
1179         r = link_request_to_activate(link);
1180         if (r < 0)
1181                 return r;
1182
1183         r = ipv4ll_configure(link);
1184         if (r < 0)
1185                 return r;
1186
1187         r = link_request_dhcp4_client(link);
1188         if (r < 0)
1189                 return r;
1190
1191         r = link_request_dhcp6_client(link);
1192         if (r < 0)
1193                 return r;
1194
1195         r = link_request_ndisc(link);
1196         if (r < 0)
1197                 return r;
1198
1199         r = link_request_dhcp_server(link);
1200         if (r < 0)
1201                 return r;
1202
1203         r = link_request_radv(link);
1204         if (r < 0)
1205                 return r;
1206
1207         r = link_lldp_rx_configure(link);
1208         if (r < 0)
1209                 return r;
1210
1211         r = link_lldp_tx_configure(link);
1212         if (r < 0)
1213                 return r;
1214
1215         r = link_drop_foreign_config(link);
1216         if (r < 0)
1217                 return r;
1218
1219         r = link_request_static_configs(link);
1220         if (r < 0)
1221                 return r;
1222
1223         if (!link_has_carrier(link))
1224                 return 0;
1225
1226         return link_acquire_dynamic_conf(link);
1227 }
1228
1229 static int link_get_network(Link *link, Network **ret) {
1230         Network *network;
1231         int r;
1232
1233         assert(link);
1234         assert(link->manager);
1235         assert(ret);
1236
1237         ORDERED_HASHMAP_FOREACH(network, link->manager->networks) {
1238                 bool warn = false;
1239
1240                 r = net_match_config(
1241                                 &network->match,
1242                                 link->dev,
1243                                 &link->hw_addr,
1244                                 &link->permanent_hw_addr,
1245                                 link->driver,
1246                                 link->iftype,
1247                                 link->kind,
1248                                 link->ifname,
1249                                 link->alternative_names,
1250                                 link->wlan_iftype,
1251                                 link->ssid,
1252                                 &link->bssid);
1253                 if (r < 0)
1254                         return r;
1255                 if (r == 0)
1256                         continue;
1257
1258                 if (network->match.ifname && link->dev) {
1259                         uint8_t name_assign_type = NET_NAME_UNKNOWN;
1260                         const char *attr;
1261
1262                         if (sd_device_get_sysattr_value(link->dev, "name_assign_type", &attr) >= 0)
1263                                 (void) safe_atou8(attr, &name_assign_type);
1264
1265                         warn = name_assign_type == NET_NAME_ENUM;
1266                 }
1267
1268                 log_link_full(link, warn ? LOG_WARNING : LOG_DEBUG,
1269                               "found matching network '%s'%s.",
1270                               network->filename,
1271                               warn ? ", based on potentially unpredictable interface name" : "");
1272
1273                 if (network->unmanaged)
1274                         return -ENOENT;
1275
1276                 *ret = network;
1277                 return 0;
1278         }
1279
1280         return -ENOENT;
1281 }
1282
1283 int link_reconfigure_impl(Link *link, bool force) {
1284         Network *network = NULL;
1285         NetDev *netdev = NULL;
1286         int r;
1287
1288         assert(link);
1289
1290         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
1291                 return 0;
1292
1293         r = netdev_get(link->manager, link->ifname, &netdev);
1294         if (r < 0 && r != -ENOENT)
1295                 return r;
1296
1297         r = link_get_network(link, &network);
1298         if (r < 0 && r != -ENOENT)
1299                 return r;
1300
1301         if (link->state != LINK_STATE_UNMANAGED && !network)
1302                 /* If link is in initialized state, then link->network is also NULL. */
1303                 force = true;
1304
1305         if (link->network == network && !force)
1306                 return 0;
1307
1308         if (network) {
1309                 _cleanup_free_ char *joined = strv_join(network->dropins, ", ");
1310
1311                 if (link->state == LINK_STATE_INITIALIZED)
1312                         log_link_info(link, "Configuring with %s%s%s%s.",
1313                                       network->filename,
1314                                       isempty(joined) ? "" : " (dropins: ",
1315                                       joined,
1316                                       isempty(joined) ? "" : ")");
1317                 else
1318                         log_link_info(link, "Reconfiguring with %s%s%s%s.",
1319                                       network->filename,
1320                                       isempty(joined) ? "" : " (dropins: ",
1321                                       joined,
1322                                       isempty(joined) ? "" : ")");
1323         } else
1324                 log_link_full(link, link->state == LINK_STATE_INITIALIZED ? LOG_DEBUG : LOG_INFO,
1325                               "Unmanaging interface.");
1326
1327         /* Dropping old .network file */
1328         r = link_stop_engines(link, false);
1329         if (r < 0)
1330                 return r;
1331
1332         r = link_drop_requests(link);
1333         if (r < 0)
1334                 return r;
1335
1336         if (network && !force && network->keep_configuration != KEEP_CONFIGURATION_YES)
1337                 /* When a new/updated .network file is assigned, first make all configs (addresses,
1338                  * routes, and so on) foreign, and then drop unnecessary configs later by
1339                  * link_drop_foreign_config() in link_configure().
1340                  * Note, when KeepConfiguration=yes, link_drop_foreign_config() does nothing. Hence,
1341                  * here we need to drop the configs such as addresses, routes, and so on configured by
1342                  * the previously assigned .network file. */
1343                 link_foreignize_config(link);
1344         else {
1345                 /* Remove all managed configs. Note, foreign configs are removed in later by
1346                  * link_configure() -> link_drop_foreign_config() if the link is managed by us. */
1347                 r = link_drop_managed_config(link);
1348                 if (r < 0)
1349                         return r;
1350         }
1351
1352         /* The bound_to map depends on .network file, hence it needs to be freed. But, do not free the
1353          * bound_by map. Otherwise, if a link enters unmanaged state below, then its carrier state will
1354          * not propagated to other interfaces anymore. Moreover, it is not necessary to recreate the
1355          * map here, as it depends on .network files assigned to other links. */
1356         link_free_bound_to_list(link);
1357
1358         link_free_engines(link);
1359         link->network = network_unref(link->network);
1360
1361         netdev_unref(link->netdev);
1362         link->netdev = netdev_ref(netdev);
1363
1364         if (!network) {
1365                 link_set_state(link, LINK_STATE_UNMANAGED);
1366                 return 0;
1367         }
1368
1369         /* Then, apply new .network file */
1370         link->network = network_ref(network);
1371         link_update_operstate(link, true);
1372         link_dirty(link);
1373
1374         link_set_state(link, LINK_STATE_INITIALIZED);
1375         link->activated = false;
1376
1377         r = link_configure(link);
1378         if (r < 0)
1379                 return r;
1380
1381         return 1;
1382 }
1383
1384 static int link_reconfigure_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, bool force) {
1385         int r;
1386
1387         assert(link);
1388
1389         r = link_getlink_handler_internal(rtnl, m, link, "Failed to update link state");
1390         if (r <= 0)
1391                 return r;
1392
1393         r = link_reconfigure_impl(link, force);
1394         if (r < 0) {
1395                 link_enter_failed(link);
1396                 return 0;
1397         }
1398
1399         return r;
1400 }
1401
1402 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1403         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ false);
1404 }
1405
1406 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1407         return link_reconfigure_handler_internal(rtnl, m, link, /* force = */ true);
1408 }
1409
1410 int link_reconfigure(Link *link, bool force) {
1411         int r;
1412
1413         assert(link);
1414
1415         /* When link in pending or initialized state, then link_configure() will be called. To prevent
1416          * the function from being called multiple times simultaneously, refuse to reconfigure the
1417          * interface in these cases. */
1418         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED, LINK_STATE_LINGER))
1419                 return 0; /* 0 means no-op. */
1420
1421         r = link_call_getlink(link, force ? link_force_reconfigure_handler : link_reconfigure_handler);
1422         if (r < 0)
1423                 return r;
1424
1425         return 1; /* 1 means the interface will be reconfigured. */
1426 }
1427
1428 static int link_initialized_and_synced(Link *link) {
1429         int r;
1430
1431         assert(link);
1432         assert(link->manager);
1433
1434         if (link->manager->test_mode) {
1435                 log_link_debug(link, "Running in test mode, refusing to enter initialized state.");
1436                 link_set_state(link, LINK_STATE_UNMANAGED);
1437                 return 0;
1438         }
1439
1440         if (link->state == LINK_STATE_PENDING) {
1441                 log_link_debug(link, "Link state is up-to-date");
1442                 link_set_state(link, LINK_STATE_INITIALIZED);
1443
1444                 r = link_new_bound_by_list(link);
1445                 if (r < 0)
1446                         return r;
1447
1448                 r = link_handle_bound_by_list(link);
1449                 if (r < 0)
1450                         return r;
1451         }
1452
1453         return link_reconfigure_impl(link, /* force = */ false);
1454 }
1455
1456 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1457         int r;
1458
1459         r = link_getlink_handler_internal(rtnl, m, link, "Failed to wait for the interface to be initialized");
1460         if (r <= 0)
1461                 return r;
1462
1463         r = link_initialized_and_synced(link);
1464         if (r < 0)
1465                 link_enter_failed(link);
1466
1467         return 0;
1468 }
1469
1470 static int link_initialized(Link *link, sd_device *device) {
1471         int r;
1472
1473         assert(link);
1474         assert(device);
1475
1476         /* Always replace with the new sd_device object. As the sysname (and possibly other properties
1477          * or sysattrs) may be outdated. */
1478         device_unref_and_replace(link->dev, device);
1479
1480         if (link->dhcp_client) {
1481                 r = sd_dhcp_client_attach_device(link->dhcp_client, link->dev);
1482                 if (r < 0)
1483                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv4 client, ignoring: %m");
1484         }
1485
1486         if (link->dhcp6_client) {
1487                 r = sd_dhcp6_client_attach_device(link->dhcp6_client, link->dev);
1488                 if (r < 0)
1489                         log_link_warning_errno(link, r, "Failed to attach device to DHCPv6 client, ignoring: %m");
1490         }
1491
1492         r = link_set_sr_iov_ifindices(link);
1493         if (r < 0)
1494                 log_link_warning_errno(link, r, "Failed to manage SR-IOV PF and VF ports, ignoring: %m");
1495
1496         if (link->state != LINK_STATE_PENDING)
1497                 return link_reconfigure(link, /* force = */ false);
1498
1499         log_link_debug(link, "udev initialized link");
1500
1501         /* udev has initialized the link, but we don't know if we have yet
1502          * processed the NEWLINK messages with the latest state. Do a GETLINK,
1503          * when it returns we know that the pending NEWLINKs have already been
1504          * processed and that we are up-to-date */
1505
1506         return link_call_getlink(link, link_initialized_handler);
1507 }
1508
1509 static int link_check_initialized(Link *link) {
1510         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
1511         int r;
1512
1513         assert(link);
1514
1515         if (!udev_available())
1516                 return link_initialized_and_synced(link);
1517
1518         /* udev should be around */
1519         r = sd_device_new_from_ifindex(&device, link->ifindex);
1520         if (r < 0) {
1521                 log_link_debug_errno(link, r, "Could not find device, waiting for device initialization: %m");
1522                 return 0;
1523         }
1524
1525         r = sd_device_get_is_initialized(device);
1526         if (r < 0)
1527                 return log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
1528         if (r == 0) {
1529                 /* not yet ready */
1530                 log_link_debug(link, "link pending udev initialization...");
1531                 return 0;
1532         }
1533
1534         r = device_is_renaming(device);
1535         if (r < 0)
1536                 return log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
1537         if (r > 0) {
1538                 log_link_debug(link, "Interface is being renamed, pending initialization.");
1539                 return 0;
1540         }
1541
1542         return link_initialized(link, device);
1543 }
1544
1545 int manager_udev_process_link(Manager *m, sd_device *device, sd_device_action_t action) {
1546         int r, ifindex;
1547         const char *s;
1548         Link *link;
1549
1550         assert(m);
1551         assert(device);
1552
1553         r = sd_device_get_ifindex(device, &ifindex);
1554         if (r < 0)
1555                 return log_device_debug_errno(device, r, "Failed to get ifindex: %m");
1556
1557         r = link_get_by_index(m, ifindex, &link);
1558         if (r < 0) {
1559                 /* This error is not critical, as the corresponding rtnl message may be received later. */
1560                 log_device_debug_errno(device, r, "Failed to get link from ifindex %i, ignoring: %m", ifindex);
1561                 return 0;
1562         }
1563
1564         /* Let's unref the sd-device object assigned to the corresponding Link object, but keep the Link
1565          * object here. It will be removed only when rtnetlink says so. */
1566         if (action == SD_DEVICE_REMOVE) {
1567                 link->dev = sd_device_unref(link->dev);
1568                 return 0;
1569         }
1570
1571         r = device_is_renaming(device);
1572         if (r < 0)
1573                 return log_device_debug_errno(device, r, "Failed to determine if the device is renaming or not: %m");
1574         if (r > 0) {
1575                 log_device_debug(device, "Device is renaming, waiting for the interface to be renamed.");
1576                 /* TODO:
1577                  * What happens when a device is initialized, then soon renamed after that? When we detect
1578                  * such, maybe we should cancel or postpone all queued requests for the interface. */
1579                 return 0;
1580         }
1581
1582         r = sd_device_get_property_value(device, "ID_NET_MANAGED_BY", &s);
1583         if (r < 0 && r != -ENOENT)
1584                 log_device_debug_errno(device, r, "Failed to get ID_NET_MANAGED_BY udev property, ignoring: %m");
1585         if (r >= 0 && !streq(s, "io.systemd.Network")) {
1586                 log_device_debug(device, "Interface is requested to be managed by '%s', not managing the interface.", s);
1587                 link_set_state(link, LINK_STATE_UNMANAGED);
1588                 return 0;
1589         }
1590
1591         r = link_initialized(link, device);
1592         if (r < 0)
1593                 link_enter_failed(link);
1594
1595         return 0;
1596 }
1597
1598 static int link_carrier_gained(Link *link) {
1599         bool force_reconfigure;
1600         int r;
1601
1602         assert(link);
1603
1604         r = event_source_disable(link->carrier_lost_timer);
1605         if (r < 0)
1606                 log_link_warning_errno(link, r, "Failed to disable carrier lost timer, ignoring: %m");
1607
1608         /* If a wireless interface was connected to an access point, and the SSID is changed (that is,
1609          * both previous_ssid and ssid are non-NULL), then the connected wireless network could be
1610          * changed. So, always reconfigure the link. Which means e.g. the DHCP client will be
1611          * restarted, and the correct network information will be gained.
1612          *
1613          * However, do not reconfigure the wireless interface forcibly if it was not connected to any
1614          * access points previously (previous_ssid is NULL in this case). As, a .network file may be
1615          * already assigned to the interface (in that case, the .network file does not have the SSID=
1616          * setting in the [Match] section), and the interface is already being configured. Of course,
1617          * there may exist another .network file with higher priority and a matching SSID= setting. But
1618          * in that case, link_reconfigure_impl() can handle that without the force_reconfigure flag.
1619          *
1620          * For non-wireless interfaces, we have no way to detect the connected network change. So,
1621          * setting force_reconfigure = false. Note, both ssid and previous_ssid are NULL in that case. */
1622         force_reconfigure = link->previous_ssid && !streq_ptr(link->previous_ssid, link->ssid);
1623         link->previous_ssid = mfree(link->previous_ssid);
1624
1625         /* AP and P2P-GO interfaces may have a new SSID - update the link properties in case a new .network
1626          * profile wants to match on it with SSID= in its [Match] section.
1627          */
1628         if (IN_SET(link->wlan_iftype, NL80211_IFTYPE_AP, NL80211_IFTYPE_P2P_GO)) {
1629                 r = link_get_wlan_interface(link);
1630                 if (r < 0)
1631                         return r;
1632         }
1633
1634         /* At this stage, both wlan and link information should be up-to-date. Hence, it is not necessary to
1635          * call RTM_GETLINK, NL80211_CMD_GET_INTERFACE, or NL80211_CMD_GET_STATION commands, and simply call
1636          * link_reconfigure_impl(). Note, link_reconfigure_impl() returns 1 when the link is reconfigured. */
1637         r = link_reconfigure_impl(link, force_reconfigure);
1638         if (r != 0)
1639                 return r;
1640
1641         r = link_handle_bound_by_list(link);
1642         if (r < 0)
1643                 return r;
1644
1645         if (link->iftype == ARPHRD_CAN)
1646                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1647                 return 0;
1648
1649         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
1650                 r = link_acquire_dynamic_conf(link);
1651                 if (r < 0)
1652                         return r;
1653
1654                 r = link_request_static_configs(link);
1655                 if (r < 0)
1656                         return r;
1657         }
1658
1659         return 0;
1660 }
1661
1662 static int link_carrier_lost_impl(Link *link) {
1663         int r, ret = 0;
1664
1665         assert(link);
1666
1667         link->previous_ssid = mfree(link->previous_ssid);
1668
1669         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1670                 return 0;
1671
1672         if (!link->network)
1673                 return 0;
1674
1675         r = link_stop_engines(link, false);
1676         if (r < 0)
1677                 ret = r;
1678
1679         r = link_drop_managed_config(link);
1680         if (r < 0 && ret >= 0)
1681                 ret = r;
1682
1683         return ret;
1684 }
1685
1686 static int link_carrier_lost_handler(sd_event_source *s, uint64_t usec, void *userdata) {
1687         Link *link = ASSERT_PTR(userdata);
1688         int r;
1689
1690         r = link_carrier_lost_impl(link);
1691         if (r < 0) {
1692                 log_link_warning_errno(link, r, "Failed to process carrier lost event: %m");
1693                 link_enter_failed(link);
1694         }
1695
1696         return 0;
1697 }
1698
1699 static int link_carrier_lost(Link *link) {
1700         uint16_t dhcp_mtu;
1701         usec_t usec;
1702         int r;
1703
1704         assert(link);
1705
1706         r = link_handle_bound_by_list(link);
1707         if (r < 0)
1708                 return r;
1709
1710         if (link->iftype == ARPHRD_CAN)
1711                 /* let's shortcut things for CAN which doesn't need most of what's done below. */
1712                 return 0;
1713
1714         if (!link->network)
1715                 return 0;
1716
1717         if (link->network->ignore_carrier_loss_set)
1718                 /* If IgnoreCarrierLoss= is explicitly specified, then use the specified value. */
1719                 usec = link->network->ignore_carrier_loss_usec;
1720
1721         else if (link->network->bond && link->wlan_iftype > 0)
1722                 /* Enslaving wlan interface to a bond disconnects from the connected AP, and causes its
1723                  * carrier to be lost. See #19832. */
1724                 usec = 3 * USEC_PER_SEC;
1725
1726         else if (link->network->dhcp_use_mtu &&
1727                  link->dhcp_lease &&
1728                  sd_dhcp_lease_get_mtu(link->dhcp_lease, &dhcp_mtu) >= 0 &&
1729                  dhcp_mtu != link->original_mtu)
1730                 /* Some drivers reset interfaces when changing MTU. Resetting interfaces by the static
1731                  * MTU should not cause any issues, as MTU is changed only once. However, setting MTU
1732                  * through DHCP lease causes an infinite loop of resetting the interface. See #18738. */
1733                 usec = 5 * USEC_PER_SEC;
1734
1735         else
1736                 /* Otherwise, use the implied default value. */
1737                 usec = link->network->ignore_carrier_loss_usec;
1738
1739         if (usec == USEC_INFINITY)
1740                 return 0;
1741
1742         if (usec == 0)
1743                 return link_carrier_lost_impl(link);
1744
1745         return event_reset_time_relative(link->manager->event,
1746                                          &link->carrier_lost_timer,
1747                                          CLOCK_BOOTTIME,
1748                                          usec,
1749                                          0,
1750                                          link_carrier_lost_handler,
1751                                          link,
1752                                          0,
1753                                          "link-carrier-loss",
1754                                          true);
1755 }
1756
1757 static int link_admin_state_up(Link *link) {
1758         int r;
1759
1760         assert(link);
1761
1762         /* This is called every time an interface admin state changes to up;
1763          * specifically, when IFF_UP flag changes from unset to set. */
1764
1765         if (!link->network)
1766                 return 0;
1767
1768         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_DOWN) {
1769                 log_link_info(link, "Activation policy is \"always-down\", forcing link down.");
1770                 return link_request_to_bring_up_or_down(link, /* up = */ false);
1771         }
1772
1773         /* We set the ipv6 mtu after the device mtu, but the kernel resets
1774          * ipv6 mtu on NETDEV_UP, so we need to reset it. */
1775         r = link_set_ipv6_mtu(link);
1776         if (r < 0)
1777                 log_link_warning_errno(link, r, "Cannot set IPv6 MTU, ignoring: %m");
1778
1779         return 0;
1780 }
1781
1782 static int link_admin_state_down(Link *link) {
1783         assert(link);
1784
1785         if (!link->network)
1786                 return 0;
1787
1788         if (link->activated && link->network->activation_policy == ACTIVATION_POLICY_ALWAYS_UP) {
1789                 log_link_info(link, "Activation policy is \"always-up\", forcing link up.");
1790                 return link_request_to_bring_up_or_down(link, /* up = */ true);
1791         }
1792
1793         return 0;
1794 }
1795
1796 static bool link_is_enslaved(Link *link) {
1797         if (link->flags & IFF_SLAVE)
1798                 return true;
1799
1800         if (link->master_ifindex > 0)
1801                 return true;
1802
1803         return false;
1804 }
1805
1806 void link_update_operstate(Link *link, bool also_update_master) {
1807         LinkOperationalState operstate;
1808         LinkCarrierState carrier_state;
1809         LinkAddressState ipv4_address_state, ipv6_address_state, address_state;
1810         LinkOnlineState online_state;
1811         _cleanup_strv_free_ char **p = NULL;
1812         bool changed = false;
1813
1814         assert(link);
1815
1816         if (link->kernel_operstate == IF_OPER_DORMANT)
1817                 carrier_state = LINK_CARRIER_STATE_DORMANT;
1818         else if (link_has_carrier(link)) {
1819                 if (link_is_enslaved(link))
1820                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
1821                 else
1822                         carrier_state = LINK_CARRIER_STATE_CARRIER;
1823         } else if (link->flags & IFF_UP)
1824                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
1825         else
1826                 carrier_state = LINK_CARRIER_STATE_OFF;
1827
1828         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
1829                 Link *slave;
1830
1831                 SET_FOREACH(slave, link->slaves) {
1832                         link_update_operstate(slave, false);
1833
1834                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
1835                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
1836                 }
1837         }
1838
1839         link_get_address_states(link, &ipv4_address_state, &ipv6_address_state, &address_state);
1840
1841         /* Mapping of address and carrier state vs operational state
1842          *                                                     carrier state
1843          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1844          *                 ------------------------------------------------------------------------------
1845          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
1846          * address_state   degraded | off | no-carrier | dormant | degraded         | degraded | enslaved
1847          *                 routable | off | no-carrier | dormant | routable         | routable | routable
1848          */
1849
1850         if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_ROUTABLE)
1851                 operstate = LINK_OPERSTATE_ROUTABLE;
1852         else if (carrier_state == LINK_CARRIER_STATE_DEGRADED_CARRIER && address_state == LINK_ADDRESS_STATE_DEGRADED)
1853                 operstate = LINK_OPERSTATE_DEGRADED;
1854         else if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
1855                 operstate = (LinkOperationalState) carrier_state;
1856         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
1857                 operstate = LINK_OPERSTATE_ROUTABLE;
1858         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
1859                 operstate = LINK_OPERSTATE_DEGRADED;
1860         else
1861                 operstate = LINK_OPERSTATE_ENSLAVED;
1862
1863         LinkOperationalStateRange req;
1864         link_required_operstate_for_online(link, &req);
1865
1866         /* Only determine online state for managed links with RequiredForOnline=yes */
1867         if (!link->network || !link->network->required_for_online)
1868                 online_state = _LINK_ONLINE_STATE_INVALID;
1869
1870         else if (!operational_state_is_in_range(operstate, &req))
1871                 online_state = LINK_ONLINE_STATE_OFFLINE;
1872
1873         else {
1874                 AddressFamily required_family = link->network->required_family_for_online;
1875                 bool needs_ipv4 = required_family & ADDRESS_FAMILY_IPV4;
1876                 bool needs_ipv6 = required_family & ADDRESS_FAMILY_IPV6;
1877
1878                 /* The operational state is within the range required for online.
1879                  * If a particular address family is also required, we might revert
1880                  * to offline in the blocks below. */
1881                 online_state = LINK_ONLINE_STATE_ONLINE;
1882
1883                 if (req.min >= LINK_OPERSTATE_DEGRADED) {
1884                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_DEGRADED)
1885                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1886                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_DEGRADED)
1887                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1888                 }
1889
1890                 if (req.min >= LINK_OPERSTATE_ROUTABLE) {
1891                         if (needs_ipv4 && ipv4_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1892                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1893                         if (needs_ipv6 && ipv6_address_state < LINK_ADDRESS_STATE_ROUTABLE)
1894                                 online_state = LINK_ONLINE_STATE_OFFLINE;
1895                 }
1896         }
1897
1898         if (link->carrier_state != carrier_state) {
1899                 link->carrier_state = carrier_state;
1900                 changed = true;
1901                 if (strv_extend(&p, "CarrierState") < 0)
1902                         log_oom();
1903         }
1904
1905         if (link->address_state != address_state) {
1906                 link->address_state = address_state;
1907                 changed = true;
1908                 if (strv_extend(&p, "AddressState") < 0)
1909                         log_oom();
1910         }
1911
1912         if (link->ipv4_address_state != ipv4_address_state) {
1913                 link->ipv4_address_state = ipv4_address_state;
1914                 changed = true;
1915                 if (strv_extend(&p, "IPv4AddressState") < 0)
1916                         log_oom();
1917         }
1918
1919         if (link->ipv6_address_state != ipv6_address_state) {
1920                 link->ipv6_address_state = ipv6_address_state;
1921                 changed = true;
1922                 if (strv_extend(&p, "IPv6AddressState") < 0)
1923                         log_oom();
1924         }
1925
1926         if (link->operstate != operstate) {
1927                 link->operstate = operstate;
1928                 changed = true;
1929                 if (strv_extend(&p, "OperationalState") < 0)
1930                         log_oom();
1931         }
1932
1933         if (link->online_state != online_state) {
1934                 link->online_state = online_state;
1935                 changed = true;
1936                 if (strv_extend(&p, "OnlineState") < 0)
1937                         log_oom();
1938         }
1939
1940         if (p)
1941                 link_send_changed_strv(link, p);
1942         if (changed)
1943                 link_dirty(link);
1944
1945         if (also_update_master) {
1946                 Link *master;
1947
1948                 if (link_get_master(link, &master) >= 0)
1949                         link_update_operstate(master, true);
1950         }
1951 }
1952
1953 #define FLAG_STRING(string, flag, old, new)                      \
1954         (((old ^ new) & flag)                                    \
1955          ? ((old & flag) ? (" -" string) : (" +" string))        \
1956          : "")
1957
1958 static int link_update_flags(Link *link, sd_netlink_message *message) {
1959         bool link_was_admin_up, had_carrier;
1960         uint8_t operstate;
1961         unsigned flags;
1962         int r;
1963
1964         assert(link);
1965         assert(message);
1966
1967         r = sd_rtnl_message_link_get_flags(message, &flags);
1968         if (r < 0)
1969                 return log_link_debug_errno(link, r, "rtnl: failed to read link flags: %m");
1970
1971         r = sd_netlink_message_read_u8(message, IFLA_OPERSTATE, &operstate);
1972         if (r == -ENODATA)
1973                 /* If we got a message without operstate, assume the state was unchanged. */
1974                 operstate = link->kernel_operstate;
1975         else if (r < 0)
1976                 return log_link_debug_errno(link, r, "rtnl: failed to read operational state: %m");
1977
1978         if (link->flags == flags && link->kernel_operstate == operstate)
1979                 return 0;
1980
1981         if (link->flags != flags) {
1982                 unsigned unknown_flags, unknown_flags_added, unknown_flags_removed;
1983
1984                 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",
1985                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
1986                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
1987                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
1988                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
1989                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
1990                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
1991                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
1992                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
1993                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
1994                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
1995                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
1996                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
1997                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
1998                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
1999                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
2000                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
2001                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
2002                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
2003                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
2004
2005                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
2006                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
2007                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
2008                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
2009                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
2010                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
2011                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
2012                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
2013
2014                 if (unknown_flags_added)
2015                         log_link_debug(link, "Unknown link flags gained, ignoring: %#.5x", unknown_flags_added);
2016
2017                 if (unknown_flags_removed)
2018                         log_link_debug(link, "Unknown link flags lost, ignoring: %#.5x", unknown_flags_removed);
2019         }
2020
2021         link_was_admin_up = link->flags & IFF_UP;
2022         had_carrier = link_has_carrier(link);
2023
2024         link->flags = flags;
2025         link->kernel_operstate = operstate;
2026
2027         link_update_operstate(link, true);
2028
2029         if (!link_was_admin_up && (link->flags & IFF_UP)) {
2030                 log_link_info(link, "Link UP");
2031
2032                 r = link_admin_state_up(link);
2033                 if (r < 0)
2034                         return r;
2035         } else if (link_was_admin_up && !(link->flags & IFF_UP)) {
2036                 log_link_info(link, "Link DOWN");
2037
2038                 r = link_admin_state_down(link);
2039                 if (r < 0)
2040                         return r;
2041         }
2042
2043         if (!had_carrier && link_has_carrier(link)) {
2044                 log_link_info(link, "Gained carrier");
2045
2046                 r = link_carrier_gained(link);
2047                 if (r < 0)
2048                         return r;
2049         } else if (had_carrier && !link_has_carrier(link)) {
2050                 log_link_info(link, "Lost carrier");
2051
2052                 r = link_carrier_lost(link);
2053                 if (r < 0)
2054                         return r;
2055         }
2056
2057         return 0;
2058 }
2059
2060 static int link_update_master(Link *link, sd_netlink_message *message) {
2061         int master_ifindex, r;
2062
2063         assert(link);
2064         assert(message);
2065
2066         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t*) &master_ifindex);
2067         if (r == -ENODATA)
2068                 return 0;
2069         if (r < 0)
2070                 return log_link_debug_errno(link, r, "rtnl: failed to read master ifindex: %m");
2071
2072         if (master_ifindex == link->ifindex)
2073                 master_ifindex = 0;
2074
2075         if (master_ifindex != link->master_ifindex) {
2076                 if (link->master_ifindex == 0)
2077                         log_link_debug(link, "Attached to master interface: %i", master_ifindex);
2078                 else if (master_ifindex == 0)
2079                         log_link_debug(link, "Detached from master interface: %i", link->master_ifindex);
2080                 else
2081                         log_link_debug(link, "Master interface changed: %i %s %i", link->master_ifindex,
2082                                        special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), master_ifindex);
2083
2084                 link_drop_from_master(link);
2085                 link->master_ifindex = master_ifindex;
2086         }
2087
2088         r = link_append_to_master(link);
2089         if (r < 0)
2090                 return log_link_debug_errno(link, r, "Failed to append link to master: %m");
2091
2092         return 0;
2093 }
2094
2095 static int link_update_driver(Link *link, sd_netlink_message *message) {
2096         int r;
2097
2098         assert(link);
2099         assert(link->manager);
2100         assert(message);
2101
2102         /* Driver is already read. Assuming the driver is never changed. */
2103         if (link->ethtool_driver_read)
2104                 return 0;
2105
2106         /* When udevd is running, read the driver after the interface is initialized by udevd.
2107          * Otherwise, ethtool may not work correctly. See issue #22538.
2108          * When udevd is not running, read the value when the interface is detected. */
2109         if (udev_available() && !link->dev)
2110                 return 0;
2111
2112         link->ethtool_driver_read = true;
2113
2114         r = ethtool_get_driver(&link->manager->ethtool_fd, link->ifname, &link->driver);
2115         if (r < 0) {
2116                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
2117                 return 0;
2118         }
2119
2120         log_link_debug(link, "Found driver: %s", strna(link->driver));
2121
2122         if (streq_ptr(link->driver, "dsa")) {
2123                 uint32_t dsa_master_ifindex = 0;
2124
2125                 r = sd_netlink_message_read_u32(message, IFLA_LINK, &dsa_master_ifindex);
2126                 if (r < 0 && r != -ENODATA)
2127                         return log_link_debug_errno(link, r, "rtnl: failed to read ifindex of the DSA master interface: %m");
2128
2129                 if (dsa_master_ifindex > INT_MAX) {
2130                         log_link_debug(link, "rtnl: received too large DSA master ifindex (%"PRIu32" > INT_MAX), ignoring.",
2131                                        dsa_master_ifindex);
2132                         dsa_master_ifindex = 0;
2133                 }
2134
2135                 link->dsa_master_ifindex = (int) dsa_master_ifindex;
2136         }
2137
2138         return 1; /* needs reconfigure */
2139 }
2140
2141 static int link_update_permanent_hardware_address_from_ethtool(Link *link, sd_netlink_message *message) {
2142         int r;
2143
2144         assert(link);
2145         assert(link->manager);
2146         assert(message);
2147
2148         if (link->ethtool_permanent_hw_addr_read)
2149                 return 0;
2150
2151         /* When udevd is running, read the permanent hardware address after the interface is
2152          * initialized by udevd. Otherwise, ethtool may not work correctly. See issue #22538.
2153          * When udevd is not running, read the value when the interface is detected. */
2154         if (udev_available() && !link->dev)
2155                 return 0;
2156
2157         /* If the interface does not have a hardware address, then it will not have a permanent address either. */
2158         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, NULL);
2159         if (r == -ENODATA)
2160                 return 0;
2161         if (r < 0)
2162                 return log_link_debug_errno(link, r, "Failed to read IFLA_ADDRESS attribute: %m");
2163
2164         link->ethtool_permanent_hw_addr_read = true;
2165
2166         r = ethtool_get_permanent_hw_addr(&link->manager->ethtool_fd, link->ifname, &link->permanent_hw_addr);
2167         if (r < 0)
2168                 log_link_debug_errno(link, r, "Permanent hardware address not found, continuing without: %m");
2169
2170         return 0;
2171 }
2172
2173 static int link_update_permanent_hardware_address(Link *link, sd_netlink_message *message) {
2174         int r;
2175
2176         assert(link);
2177         assert(link->manager);
2178         assert(message);
2179
2180         if (link->permanent_hw_addr.length > 0)
2181                 return 0;
2182
2183         r = netlink_message_read_hw_addr(message, IFLA_PERM_ADDRESS, &link->permanent_hw_addr);
2184         if (r < 0) {
2185                 if (r != -ENODATA)
2186                         return log_link_debug_errno(link, r, "Failed to read IFLA_PERM_ADDRESS attribute: %m");
2187
2188                 /* Fallback to ethtool for older kernels. */
2189                 r = link_update_permanent_hardware_address_from_ethtool(link, message);
2190                 if (r < 0)
2191                         return r;
2192         }
2193
2194         if (link->permanent_hw_addr.length > 0)
2195                 log_link_debug(link, "Saved permanent hardware address: %s", HW_ADDR_TO_STR(&link->permanent_hw_addr));
2196
2197         return 1; /* needs reconfigure */
2198 }
2199
2200 static int link_update_hardware_address(Link *link, sd_netlink_message *message) {
2201         struct hw_addr_data addr;
2202         int r;
2203
2204         assert(link);
2205         assert(message);
2206
2207         r = netlink_message_read_hw_addr(message, IFLA_BROADCAST, &link->bcast_addr);
2208         if (r < 0 && r != -ENODATA)
2209                 return log_link_debug_errno(link, r, "rtnl: failed to read broadcast address: %m");
2210
2211         r = netlink_message_read_hw_addr(message, IFLA_ADDRESS, &addr);
2212         if (r == -ENODATA)
2213                 return 0;
2214         if (r < 0)
2215                 return log_link_debug_errno(link, r, "rtnl: failed to read hardware address: %m");
2216
2217         if (hw_addr_equal(&link->hw_addr, &addr))
2218                 return 0;
2219
2220         if (link->hw_addr.length == 0)
2221                 log_link_debug(link, "Saved hardware address: %s", HW_ADDR_TO_STR(&addr));
2222         else {
2223                 log_link_debug(link, "Hardware address is changed: %s %s %s",
2224                                HW_ADDR_TO_STR(&link->hw_addr),
2225                                special_glyph(SPECIAL_GLYPH_ARROW_RIGHT),
2226                                HW_ADDR_TO_STR(&addr));
2227
2228                 hashmap_remove_value(link->manager->links_by_hw_addr, &link->hw_addr, link);
2229         }
2230
2231         link->hw_addr = addr;
2232
2233         if (!hw_addr_is_null(&link->hw_addr)) {
2234                 r = hashmap_ensure_put(&link->manager->links_by_hw_addr, &hw_addr_hash_ops, &link->hw_addr, link);
2235                 if (r == -EEXIST && streq_ptr(link->kind, "bond"))
2236                         /* bonding master and its slaves have the same hardware address. */
2237                         r = hashmap_replace(link->manager->links_by_hw_addr, &link->hw_addr, link);
2238                 if (r < 0)
2239                         log_link_debug_errno(link, r, "Failed to manage link by its new hardware address, ignoring: %m");
2240         }
2241
2242         r = ipv4acd_update_mac(link);
2243         if (r < 0)
2244                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4 ACD client: %m");
2245
2246         r = ipv4ll_update_mac(link);
2247         if (r < 0)
2248                 return log_link_debug_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
2249
2250         r = dhcp4_update_mac(link);
2251         if (r < 0)
2252                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCP client: %m");
2253
2254         r = dhcp6_update_mac(link);
2255         if (r < 0)
2256                 return log_link_debug_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
2257
2258         r = radv_update_mac(link);
2259         if (r < 0)
2260                 return log_link_debug_errno(link, r, "Could not update MAC address for Router Advertisement: %m");
2261
2262         if (link->ndisc && link->hw_addr.length == ETH_ALEN) {
2263                 r = sd_ndisc_set_mac(link->ndisc, &link->hw_addr.ether);
2264                 if (r < 0)
2265                         return log_link_debug_errno(link, r, "Could not update MAC for NDisc: %m");
2266         }
2267
2268         if (link->lldp_rx) {
2269                 r = sd_lldp_rx_set_filter_address(link->lldp_rx, &link->hw_addr.ether);
2270                 if (r < 0)
2271                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Rx: %m");
2272         }
2273
2274         if (link->lldp_tx) {
2275                 r = sd_lldp_tx_set_hwaddr(link->lldp_tx, &link->hw_addr.ether);
2276                 if (r < 0)
2277                         return log_link_debug_errno(link, r, "Could not update MAC address for LLDP Tx: %m");
2278         }
2279
2280         return 1; /* needs reconfigure */
2281 }
2282
2283 static int link_update_mtu(Link *link, sd_netlink_message *message) {
2284         uint32_t mtu, min_mtu = 0, max_mtu = UINT32_MAX;
2285         int r;
2286
2287         assert(link);
2288         assert(message);
2289
2290         r = sd_netlink_message_read_u32(message, IFLA_MTU, &mtu);
2291         if (r == -ENODATA)
2292                 return 0;
2293         if (r < 0)
2294                 return log_link_debug_errno(link, r, "rtnl: failed to read MTU in RTM_NEWLINK message: %m");
2295         if (mtu == 0)
2296                 return 0;
2297
2298         r = sd_netlink_message_read_u32(message, IFLA_MIN_MTU, &min_mtu);
2299         if (r < 0 && r != -ENODATA)
2300                 return log_link_debug_errno(link, r, "rtnl: failed to read minimum MTU in RTM_NEWLINK message: %m");
2301
2302         r = sd_netlink_message_read_u32(message, IFLA_MAX_MTU, &max_mtu);
2303         if (r < 0 && r != -ENODATA)
2304                 return log_link_debug_errno(link, r, "rtnl: failed to read maximum MTU in RTM_NEWLINK message: %m");
2305
2306         if (max_mtu == 0)
2307                 max_mtu = UINT32_MAX;
2308
2309         link->min_mtu = min_mtu;
2310         link->max_mtu = max_mtu;
2311
2312         if (link->original_mtu == 0) {
2313                 link->original_mtu = mtu;
2314                 log_link_debug(link, "Saved original MTU %" PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2315                                link->original_mtu, link->min_mtu, link->max_mtu);
2316         }
2317
2318         if (link->mtu == mtu)
2319                 return 0;
2320
2321         if (link->mtu != 0)
2322                 log_link_debug(link, "MTU is changed: %"PRIu32" %s %"PRIu32" (min: %"PRIu32", max: %"PRIu32")",
2323                                link->mtu, special_glyph(SPECIAL_GLYPH_ARROW_RIGHT), mtu,
2324                                link->min_mtu, link->max_mtu);
2325
2326         link->mtu = mtu;
2327
2328         if (link->dhcp_client) {
2329                 r = sd_dhcp_client_set_mtu(link->dhcp_client, link->mtu);
2330                 if (r < 0)
2331                         return log_link_debug_errno(link, r, "Could not update MTU in DHCP client: %m");
2332         }
2333
2334         if (link->radv) {
2335                 r = sd_radv_set_mtu(link->radv, link->mtu);
2336                 if (r < 0)
2337                         return log_link_debug_errno(link, r, "Could not set MTU for Router Advertisement: %m");
2338         }
2339
2340         return 0;
2341 }
2342
2343 static int link_update_alternative_names(Link *link, sd_netlink_message *message) {
2344         _cleanup_strv_free_ char **altnames = NULL;
2345         int r;
2346
2347         assert(link);
2348         assert(message);
2349
2350         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &altnames);
2351         if (r == -ENODATA)
2352                 /* The message does not have IFLA_PROP_LIST container attribute. It does not mean the
2353                  * interface has no alternative name. */
2354                 return 0;
2355         if (r < 0)
2356                 return log_link_debug_errno(link, r, "rtnl: failed to read alternative names: %m");
2357
2358         if (strv_equal(altnames, link->alternative_names))
2359                 return 0;
2360
2361         STRV_FOREACH(n, link->alternative_names)
2362                 hashmap_remove(link->manager->links_by_name, *n);
2363
2364         strv_free_and_replace(link->alternative_names, altnames);
2365
2366         STRV_FOREACH(n, link->alternative_names) {
2367                 r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, *n, link);
2368                 if (r < 0)
2369                         return log_link_debug_errno(link, r, "Failed to manage link by its new alternative names: %m");
2370         }
2371
2372         return 1; /* needs reconfigure */
2373 }
2374
2375 static int link_update_name(Link *link, sd_netlink_message *message) {
2376         char ifname_from_index[IF_NAMESIZE];
2377         const char *ifname;
2378         int r;
2379
2380         assert(link);
2381         assert(message);
2382
2383         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
2384         if (r == -ENODATA)
2385                 /* Hmm?? But ok. */
2386                 return 0;
2387         if (r < 0)
2388                 return log_link_debug_errno(link, r, "Failed to read interface name in RTM_NEWLINK message: %m");
2389
2390         if (streq(ifname, link->ifname))
2391                 return 0;
2392
2393         r = format_ifname(link->ifindex, ifname_from_index);
2394         if (r < 0)
2395                 return log_link_debug_errno(link, r, "Could not get interface name for index %i.", link->ifindex);
2396
2397         if (!streq(ifname, ifname_from_index)) {
2398                 log_link_debug(link, "New interface name '%s' received from the kernel does not correspond "
2399                                "with the name currently configured on the actual interface '%s'. Ignoring.",
2400                                ifname, ifname_from_index);
2401                 return 0;
2402         }
2403
2404         log_link_info(link, "Interface name change detected, renamed to %s.", ifname);
2405
2406         hashmap_remove(link->manager->links_by_name, link->ifname);
2407
2408         r = free_and_strdup(&link->ifname, ifname);
2409         if (r < 0)
2410                 return log_oom_debug();
2411
2412         r = hashmap_ensure_put(&link->manager->links_by_name, &string_hash_ops, link->ifname, link);
2413         if (r < 0)
2414                 return log_link_debug_errno(link, r, "Failed to manage link by its new name: %m");
2415
2416         if (link->dhcp_client) {
2417                 r = sd_dhcp_client_set_ifname(link->dhcp_client, link->ifname);
2418                 if (r < 0)
2419                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP client: %m");
2420         }
2421
2422         if (link->dhcp6_client) {
2423                 r = sd_dhcp6_client_set_ifname(link->dhcp6_client, link->ifname);
2424                 if (r < 0)
2425                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP6 client: %m");
2426         }
2427
2428         if (link->ndisc) {
2429                 r = sd_ndisc_set_ifname(link->ndisc, link->ifname);
2430                 if (r < 0)
2431                         return log_link_debug_errno(link, r, "Failed to update interface name in NDisc: %m");
2432         }
2433
2434         if (link->dhcp_server) {
2435                 r = sd_dhcp_server_set_ifname(link->dhcp_server, link->ifname);
2436                 if (r < 0)
2437                         return log_link_debug_errno(link, r, "Failed to update interface name in DHCP server: %m");
2438         }
2439
2440         if (link->radv) {
2441                 r = sd_radv_set_ifname(link->radv, link->ifname);
2442                 if (r < 0)
2443                         return log_link_debug_errno(link, r, "Failed to update interface name in Router Advertisement: %m");
2444         }
2445
2446         if (link->lldp_rx) {
2447                 r = sd_lldp_rx_set_ifname(link->lldp_rx, link->ifname);
2448                 if (r < 0)
2449                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Rx: %m");
2450         }
2451
2452         if (link->lldp_tx) {
2453                 r = sd_lldp_tx_set_ifname(link->lldp_tx, link->ifname);
2454                 if (r < 0)
2455                         return log_link_debug_errno(link, r, "Failed to update interface name in LLDP Tx: %m");
2456         }
2457
2458         if (link->ipv4ll) {
2459                 r = sd_ipv4ll_set_ifname(link->ipv4ll, link->ifname);
2460                 if (r < 0)
2461                         return log_link_debug_errno(link, r, "Failed to update interface name in IPv4LL client: %m");
2462         }
2463
2464         r = ipv4acd_set_ifname(link);
2465         if (r < 0)
2466                 return log_link_debug_errno(link, r, "Failed to update interface name in IPv4ACD client: %m");
2467
2468         return 1; /* needs reconfigure */
2469 }
2470
2471 static int link_update(Link *link, sd_netlink_message *message) {
2472         bool needs_reconfigure = false;
2473         int r;
2474
2475         assert(link);
2476         assert(message);
2477
2478         r = link_update_name(link, message);
2479         if (r < 0)
2480                 return r;
2481         needs_reconfigure = needs_reconfigure || r > 0;
2482
2483         r = link_update_alternative_names(link, message);
2484         if (r < 0)
2485                 return r;
2486         needs_reconfigure = needs_reconfigure || r > 0;
2487
2488         r = link_update_mtu(link, message);
2489         if (r < 0)
2490                 return r;
2491
2492         r = link_update_driver(link, message);
2493         if (r < 0)
2494                 return r;
2495         needs_reconfigure = needs_reconfigure || r > 0;
2496
2497         r = link_update_permanent_hardware_address(link, message);
2498         if (r < 0)
2499                 return r;
2500         needs_reconfigure = needs_reconfigure || r > 0;
2501
2502         r = link_update_hardware_address(link, message);
2503         if (r < 0)
2504                 return r;
2505         needs_reconfigure = needs_reconfigure || r > 0;
2506
2507         r = link_update_master(link, message);
2508         if (r < 0)
2509                 return r;
2510
2511         r = link_update_ipv6ll_addrgen_mode(link, message);
2512         if (r < 0)
2513                 return r;
2514
2515         r = link_update_flags(link, message);
2516         if (r < 0)
2517                 return r;
2518
2519         r = link_update_bridge_vlan(link, message);
2520         if (r < 0)
2521                 return r;
2522
2523         return needs_reconfigure;
2524 }
2525
2526 static Link *link_drop_or_unref(Link *link) {
2527         if (!link)
2528                 return NULL;
2529         if (!link->manager)
2530                 return link_unref(link);
2531         return link_drop(link);
2532 }
2533
2534 DEFINE_TRIVIAL_CLEANUP_FUNC(Link*, link_drop_or_unref);
2535
2536 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
2537         _cleanup_free_ char *ifname = NULL, *kind = NULL, *state_file = NULL, *lease_file = NULL, *lldp_file = NULL;
2538         _cleanup_(link_drop_or_unrefp) Link *link = NULL;
2539         unsigned short iftype;
2540         int r, ifindex;
2541
2542         assert(manager);
2543         assert(message);
2544         assert(ret);
2545
2546         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2547         if (r < 0)
2548                 return log_debug_errno(r, "rtnl: failed to read ifindex from link message: %m");
2549         else if (ifindex <= 0)
2550                 return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "rtnl: received link message without valid ifindex.");
2551
2552         r = sd_rtnl_message_link_get_type(message, &iftype);
2553         if (r < 0)
2554                 return log_debug_errno(r, "rtnl: failed to read interface type from link message: %m");
2555
2556         r = sd_netlink_message_read_string_strdup(message, IFLA_IFNAME, &ifname);
2557         if (r < 0)
2558                 return log_debug_errno(r, "rtnl: failed to read interface name from link message: %m");
2559
2560         /* check for link kind */
2561         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
2562         if (r >= 0) {
2563                 r = sd_netlink_message_read_string_strdup(message, IFLA_INFO_KIND, &kind);
2564                 if (r < 0 && r != -ENODATA)
2565                         return log_debug_errno(r, "rtnl: failed to read interface kind from link message: %m");
2566                 r = sd_netlink_message_exit_container(message);
2567                 if (r < 0)
2568                         return log_debug_errno(r, "rtnl: failed to exit IFLA_LINKINFO container: %m");
2569         }
2570
2571         if (!manager->test_mode) {
2572                 /* Do not update state files when running in test mode. */
2573                 if (asprintf(&state_file, "/run/systemd/netif/links/%d", ifindex) < 0)
2574                         return log_oom_debug();
2575
2576                 if (asprintf(&lease_file, "/run/systemd/netif/leases/%d", ifindex) < 0)
2577                         return log_oom_debug();
2578
2579                 if (asprintf(&lldp_file, "/run/systemd/netif/lldp/%d", ifindex) < 0)
2580                         return log_oom_debug();
2581         }
2582
2583         link = new(Link, 1);
2584         if (!link)
2585                 return -ENOMEM;
2586
2587         *link = (Link) {
2588                 .n_ref = 1,
2589                 .state = LINK_STATE_PENDING,
2590                 .online_state = _LINK_ONLINE_STATE_INVALID,
2591                 .automatic_reconfigure_ratelimit = (const RateLimit) { .interval = 10 * USEC_PER_SEC, .burst = 5 },
2592                 .ifindex = ifindex,
2593                 .iftype = iftype,
2594                 .ifname = TAKE_PTR(ifname),
2595                 .kind = TAKE_PTR(kind),
2596
2597                 .bridge_vlan_pvid = UINT16_MAX,
2598
2599                 .ipv6ll_address_gen_mode = _IPV6_LINK_LOCAL_ADDRESS_GEN_MODE_INVALID,
2600
2601                 .state_file = TAKE_PTR(state_file),
2602                 .lease_file = TAKE_PTR(lease_file),
2603                 .lldp_file = TAKE_PTR(lldp_file),
2604
2605                 .n_dns = UINT_MAX,
2606                 .dns_default_route = -1,
2607                 .llmnr = _RESOLVE_SUPPORT_INVALID,
2608                 .mdns = _RESOLVE_SUPPORT_INVALID,
2609                 .dnssec_mode = _DNSSEC_MODE_INVALID,
2610                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
2611         };
2612
2613         r = hashmap_ensure_put(&manager->links_by_index, NULL, INT_TO_PTR(link->ifindex), link);
2614         if (r < 0)
2615                 return log_link_debug_errno(link, r, "Failed to store link into manager: %m");
2616
2617         link->manager = manager;
2618
2619         r = hashmap_ensure_put(&manager->links_by_name, &string_hash_ops, link->ifname, link);
2620         if (r < 0)
2621                 return log_link_debug_errno(link, r, "Failed to manage link by its interface name: %m");
2622
2623         log_link_debug(link, "Saved new link: ifindex=%i, iftype=%s(%u), kind=%s",
2624                        link->ifindex, strna(arphrd_to_name(link->iftype)), link->iftype, strna(link->kind));
2625
2626         /* If contained in this set, the link is wireless and the corresponding NL80211_CMD_NEW_INTERFACE
2627          * message arrived too early. Request the wireless link information again.
2628          */
2629         if (set_remove(manager->new_wlan_ifindices, INT_TO_PTR(link->ifindex))) {
2630                 r = link_get_wlan_interface(link);
2631                 if (r < 0)
2632                         log_link_warning_errno(link, r, "Failed to get wireless interface, ignoring: %m");
2633         }
2634
2635         *ret = TAKE_PTR(link);
2636         return 0;
2637 }
2638
2639 int manager_rtnl_process_link(sd_netlink *rtnl, sd_netlink_message *message, Manager *manager) {
2640         Link *link = NULL;
2641         NetDev *netdev = NULL;
2642         uint16_t type;
2643         const char *name;
2644         int r, ifindex;
2645
2646         assert(rtnl);
2647         assert(message);
2648         assert(manager);
2649
2650         if (sd_netlink_message_is_error(message)) {
2651                 r = sd_netlink_message_get_errno(message);
2652                 if (r < 0)
2653                         log_message_warning_errno(message, r, "rtnl: Could not receive link message, ignoring");
2654
2655                 return 0;
2656         }
2657
2658         r = sd_netlink_message_get_type(message, &type);
2659         if (r < 0) {
2660                 log_warning_errno(r, "rtnl: Could not get message type, ignoring: %m");
2661                 return 0;
2662         } else if (!IN_SET(type, RTM_NEWLINK, RTM_DELLINK)) {
2663                 log_warning("rtnl: Received unexpected message type %u when processing link, ignoring.", type);
2664                 return 0;
2665         }
2666
2667         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
2668         if (r < 0) {
2669                 log_warning_errno(r, "rtnl: Could not get ifindex from link message, ignoring: %m");
2670                 return 0;
2671         } else if (ifindex <= 0) {
2672                 log_warning("rtnl: received link message with invalid ifindex %d, ignoring.", ifindex);
2673                 return 0;
2674         }
2675
2676         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &name);
2677         if (r < 0) {
2678                 log_warning_errno(r, "rtnl: Received link message without ifname, ignoring: %m");
2679                 return 0;
2680         }
2681
2682         (void) link_get_by_index(manager, ifindex, &link);
2683         (void) netdev_get(manager, name, &netdev);
2684
2685         switch (type) {
2686         case RTM_NEWLINK:
2687                 if (netdev) {
2688                         /* netdev exists, so make sure the ifindex matches */
2689                         r = netdev_set_ifindex(netdev, message);
2690                         if (r < 0) {
2691                                 log_netdev_warning_errno(netdev, r, "Could not process new link message for netdev, ignoring: %m");
2692                                 return 0;
2693                         }
2694                 }
2695
2696                 if (!link) {
2697                         /* link is new, so add it */
2698                         r = link_new(manager, message, &link);
2699                         if (r < 0) {
2700                                 log_warning_errno(r, "Could not process new link message: %m");
2701                                 return 0;
2702                         }
2703
2704                         r = link_update(link, message);
2705                         if (r < 0) {
2706                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2707                                 link_enter_failed(link);
2708                                 return 0;
2709                         }
2710
2711                         r = link_check_initialized(link);
2712                         if (r < 0) {
2713                                 log_link_warning_errno(link, r, "Failed to check link is initialized: %m");
2714                                 link_enter_failed(link);
2715                                 return 0;
2716                         }
2717                 } else {
2718                         r = link_update(link, message);
2719                         if (r < 0) {
2720                                 log_link_warning_errno(link, r, "Could not process link message: %m");
2721                                 link_enter_failed(link);
2722                                 return 0;
2723                         }
2724                         if (r > 0) {
2725                                 r = link_reconfigure_impl(link, /* force = */ false);
2726                                 if (r < 0) {
2727                                         log_link_warning_errno(link, r, "Failed to reconfigure interface: %m");
2728                                         link_enter_failed(link);
2729                                         return 0;
2730                                 }
2731                         }
2732                 }
2733                 break;
2734
2735         case RTM_DELLINK:
2736                 link_drop(link);
2737                 netdev_drop(netdev);
2738                 break;
2739
2740         default:
2741                 assert_not_reached();
2742         }
2743
2744         return 1;
2745 }
2746
2747 int link_getlink_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link, const char *error_msg) {
2748         uint16_t message_type;
2749         int r;
2750
2751         assert(m);
2752         assert(link);
2753         assert(error_msg);
2754
2755         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2756                 return 0;
2757
2758         r = sd_netlink_message_get_errno(m);
2759         if (r < 0) {
2760                 log_link_message_warning_errno(link, m, r, error_msg);
2761                 link_enter_failed(link);
2762                 return 0;
2763         }
2764
2765         r = sd_netlink_message_get_type(m, &message_type);
2766         if (r < 0) {
2767                 log_link_debug_errno(link, r, "rtnl: failed to read link message type, ignoring: %m");
2768                 return 0;
2769         }
2770         if (message_type != RTM_NEWLINK) {
2771                 log_link_debug(link, "rtnl: received invalid link message type, ignoring.");
2772                 return 0;
2773         }
2774
2775         r = link_update(link, m);
2776         if (r < 0) {
2777                 link_enter_failed(link);
2778                 return 0;
2779         }
2780
2781         return 1;
2782 }
2783
2784 int link_call_getlink(Link *link, link_netlink_message_handler_t callback) {
2785         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
2786         int r;
2787
2788         assert(link);
2789         assert(link->manager);
2790         assert(link->manager->rtnl);
2791         assert(callback);
2792
2793         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK, link->ifindex);
2794         if (r < 0)
2795                 return r;
2796
2797         r = netlink_call_async(link->manager->rtnl, NULL, req, callback,
2798                                link_netlink_destroy_callback, link);
2799         if (r < 0)
2800                 return r;
2801
2802         link_ref(link);
2803         return 0;
2804 }
2805
2806 static const char* const link_state_table[_LINK_STATE_MAX] = {
2807         [LINK_STATE_PENDING]     = "pending",
2808         [LINK_STATE_INITIALIZED] = "initialized",
2809         [LINK_STATE_CONFIGURING] = "configuring",
2810         [LINK_STATE_CONFIGURED]  = "configured",
2811         [LINK_STATE_UNMANAGED]   = "unmanaged",
2812         [LINK_STATE_FAILED]      = "failed",
2813         [LINK_STATE_LINGER]      = "linger",
2814 };
2815
2816 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
2817
2818 int link_flags_to_string_alloc(uint32_t flags, char **ret) {
2819         _cleanup_free_ char *str = NULL;
2820         static const char* map[] = {
2821                 [LOG2U(IFF_UP)]          = "up",             /* interface is up. */
2822                 [LOG2U(IFF_BROADCAST)]   = "broadcast",      /* broadcast address valid. */
2823                 [LOG2U(IFF_DEBUG)]       = "debug",          /* turn on debugging. */
2824                 [LOG2U(IFF_LOOPBACK)]    = "loopback",       /* interface is a loopback net. */
2825                 [LOG2U(IFF_POINTOPOINT)] = "point-to-point", /* interface has p-p link. */
2826                 [LOG2U(IFF_NOTRAILERS)]  = "no-trailers",    /* avoid use of trailers. */
2827                 [LOG2U(IFF_RUNNING)]     = "running",        /* interface RFC2863 OPER_UP. */
2828                 [LOG2U(IFF_NOARP)]       = "no-arp",         /* no ARP protocol. */
2829                 [LOG2U(IFF_PROMISC)]     = "promiscuous",    /* receive all packets. */
2830                 [LOG2U(IFF_ALLMULTI)]    = "all-multicast",  /* receive all multicast packets. */
2831                 [LOG2U(IFF_MASTER)]      = "master",         /* master of a load balancer. */
2832                 [LOG2U(IFF_SLAVE)]       = "slave",          /* slave of a load balancer. */
2833                 [LOG2U(IFF_MULTICAST)]   = "multicast",      /* supports multicast. */
2834                 [LOG2U(IFF_PORTSEL)]     = "portsel",        /* can set media type. */
2835                 [LOG2U(IFF_AUTOMEDIA)]   = "auto-media",     /* auto media select active. */
2836                 [LOG2U(IFF_DYNAMIC)]     = "dynamic",        /* dialup device with changing addresses. */
2837                 [LOG2U(IFF_LOWER_UP)]    = "lower-up",       /* driver signals L1 up. */
2838                 [LOG2U(IFF_DORMANT)]     = "dormant",        /* driver signals dormant. */
2839                 [LOG2U(IFF_ECHO)]        = "echo",           /* echo sent packets. */
2840         };
2841
2842         assert(ret);
2843
2844         for (size_t i = 0; i < ELEMENTSOF(map); i++)
2845                 if (FLAGS_SET(flags, 1 << i) && map[i])
2846                         if (!strextend_with_separator(&str, ",", map[i]))
2847                                 return -ENOMEM;
2848
2849         *ret = TAKE_PTR(str);
2850         return 0;
2851 }
2852
2853 static const char * const kernel_operstate_table[] = {
2854         [IF_OPER_UNKNOWN]        = "unknown",
2855         [IF_OPER_NOTPRESENT]     = "not-present",
2856         [IF_OPER_DOWN]           = "down",
2857         [IF_OPER_LOWERLAYERDOWN] = "lower-layer-down",
2858         [IF_OPER_TESTING]        = "testing",
2859         [IF_OPER_DORMANT]        = "dormant",
2860         [IF_OPER_UP]             = "up",
2861 };
2862
2863 DEFINE_STRING_TABLE_LOOKUP_TO_STRING(kernel_operstate, int);