src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5 #include <linux/if_arp.h>
   6 #include <linux/if_link.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "bond.h"
  11 #include "bridge.h"
  12 #include "bus-util.h"
  13 #include "dhcp-identifier.h"
  14 #include "dhcp-lease-internal.h"
  15 #include "env-file.h"
  16 #include "ethtool-util.h"
  17 #include "fd-util.h"
  18 #include "fileio.h"
  19 #include "ipvlan.h"
  20 #include "missing_network.h"
  21 #include "netlink-util.h"
  22 #include "network-internal.h"
  23 #include "networkd-can.h"
  24 #include "networkd-dhcp-server.h"
  25 #include "networkd-dhcp4.h"
  26 #include "networkd-dhcp6.h"
  27 #include "networkd-ipv4ll.h"
  28 #include "networkd-ipv6-proxy-ndp.h"
  29 #include "networkd-link-bus.h"
  30 #include "networkd-link.h"
  31 #include "networkd-lldp-tx.h"
  32 #include "networkd-manager.h"
  33 #include "networkd-ndisc.h"
  34 #include "networkd-neighbor.h"
  35 #include "networkd-sriov.h"
  36 #include "networkd-radv.h"
  37 #include "networkd-routing-policy-rule.h"
  38 #include "networkd-wifi.h"
  39 #include "set.h"
  40 #include "socket-util.h"
  41 #include "stat-util.h"
  42 #include "stdio-util.h"
  43 #include "string-table.h"
  44 #include "strv.h"
  45 #include "sysctl-util.h"
  46 #include "tc.h"
  47 #include "tmpfile-util.h"
  48 #include "udev-util.h"
  49 #include "util.h"
  50 #include "vrf.h"
  51
  52 uint32_t link_get_vrf_table(Link *link) {
  53         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  54 }
  55
  56 uint32_t link_get_dhcp_route_table(Link *link) {
  57         /* When the interface is part of an VRF use the VRFs routing table, unless
  58          * another table is explicitly specified. */
  59         if (link->network->dhcp_route_table_set)
  60                 return link->network->dhcp_route_table;
  61         return link_get_vrf_table(link);
  62 }
  63
  64 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  65         if (link->network->ipv6_accept_ra_route_table_set)
  66                 return link->network->ipv6_accept_ra_route_table;
  67         return link_get_vrf_table(link);
  68 }
  69
  70 DUID* link_get_duid(Link *link) {
  71         if (link->network->duid.type != _DUID_TYPE_INVALID)
  72                 return &link->network->duid;
  73         else
  74                 return &link->manager->duid;
  75 }
  76
  77 static bool link_dhcp6_enabled(Link *link) {
  78         assert(link);
  79
  80         if (!socket_ipv6_is_supported())
  81                 return false;
  82
  83         if (link->flags & IFF_LOOPBACK)
  84                 return false;
  85
  86         if (!link->network)
  87                 return false;
  88
  89         if (link->network->bond)
  90                 return false;
  91
  92         if (link->iftype == ARPHRD_CAN)
  93                 return false;
  94
  95         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
  96 }
  97
  98 static bool link_dhcp4_enabled(Link *link) {
  99         assert(link);
 100
 101         if (link->flags & IFF_LOOPBACK)
 102                 return false;
 103
 104         if (!link->network)
 105                 return false;
 106
 107         if (link->network->bond)
 108                 return false;
 109
 110         if (link->iftype == ARPHRD_CAN)
 111                 return false;
 112
 113         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 114 }
 115
 116 static bool link_dhcp4_server_enabled(Link *link) {
 117         assert(link);
 118
 119         if (link->flags & IFF_LOOPBACK)
 120                 return false;
 121
 122         if (!link->network)
 123                 return false;
 124
 125         if (link->network->bond)
 126                 return false;
 127
 128         if (link->iftype == ARPHRD_CAN)
 129                 return false;
 130
 131         return link->network->dhcp_server;
 132 }
 133
 134 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
 135         assert(link);
 136         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 137
 138         if (link->flags & IFF_LOOPBACK)
 139                 return false;
 140
 141         if (!link->network)
 142                 return false;
 143
 144         if (link->iftype == ARPHRD_CAN)
 145                 return false;
 146
 147         if (STRPTR_IN_SET(link->kind,
 148                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
 149                           "vti6", "nlmon", "xfrm"))
 150                 return false;
 151
 152         /* L3 or L3S mode do not support ARP. */
 153         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 154                 return false;
 155
 156         if (link->network->bond)
 157                 return false;
 158
 159         return link->network->link_local & mask;
 160 }
 161
 162 static bool link_ipv6ll_enabled(Link *link) {
 163         assert(link);
 164
 165         if (!socket_ipv6_is_supported())
 166                 return false;
 167
 168         if (link->flags & IFF_LOOPBACK)
 169                 return false;
 170
 171         if (!link->network)
 172                 return false;
 173
 174         if (link->iftype == ARPHRD_CAN)
 175                 return false;
 176
 177         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
 178                 return false;
 179
 180         if (link->network->bond)
 181                 return false;
 182
 183         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 184 }
 185
 186 static bool link_ipv6_enabled(Link *link) {
 187         assert(link);
 188
 189         if (!socket_ipv6_is_supported())
 190                 return false;
 191
 192         if (link->network->bond)
 193                 return false;
 194
 195         if (link->iftype == ARPHRD_CAN)
 196                 return false;
 197
 198         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 199         if (link_ipv6ll_enabled(link))
 200                 return true;
 201
 202         if (network_has_static_ipv6_configurations(link->network))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static bool link_radv_enabled(Link *link) {
 209         assert(link);
 210
 211         if (!link_ipv6ll_enabled(link))
 212                 return false;
 213
 214         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 215 }
 216
 217 static bool link_ipv4_forward_enabled(Link *link) {
 218         assert(link);
 219
 220         if (link->flags & IFF_LOOPBACK)
 221                 return false;
 222
 223         if (!link->network)
 224                 return false;
 225
 226         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 227                 return false;
 228
 229         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 230 }
 231
 232 static bool link_ipv6_forward_enabled(Link *link) {
 233         assert(link);
 234
 235         if (!socket_ipv6_is_supported())
 236                 return false;
 237
 238         if (link->flags & IFF_LOOPBACK)
 239                 return false;
 240
 241         if (!link->network)
 242                 return false;
 243
 244         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 245                 return false;
 246
 247         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 248 }
 249
 250 static bool link_proxy_arp_enabled(Link *link) {
 251         assert(link);
 252
 253         if (link->flags & IFF_LOOPBACK)
 254                 return false;
 255
 256         if (!link->network)
 257                 return false;
 258
 259         if (link->network->proxy_arp < 0)
 260                 return false;
 261
 262         return true;
 263 }
 264
 265 static bool link_ipv6_accept_ra_enabled(Link *link) {
 266         assert(link);
 267
 268         if (!socket_ipv6_is_supported())
 269                 return false;
 270
 271         if (link->flags & IFF_LOOPBACK)
 272                 return false;
 273
 274         if (!link->network)
 275                 return false;
 276
 277         if (!link_ipv6ll_enabled(link))
 278                 return false;
 279
 280         /* If unset use system default (enabled if local forwarding is disabled.
 281          * disabled if local forwarding is enabled).
 282          * If set, ignore or enforce RA independent of local forwarding state.
 283          */
 284         if (link->network->ipv6_accept_ra < 0)
 285                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 286                 return !link_ipv6_forward_enabled(link);
 287         else if (link->network->ipv6_accept_ra > 0)
 288                 /* accept RA even if ip_forward is enabled */
 289                 return true;
 290         else
 291                 /* ignore RA */
 292                 return false;
 293 }
 294
 295 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 296         assert(link);
 297
 298         if (!socket_ipv6_is_supported())
 299                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 300
 301         if (link->flags & IFF_LOOPBACK)
 302                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 303
 304         if (!link->network)
 305                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 306
 307         return link->network->ipv6_privacy_extensions;
 308 }
 309
 310 static int link_update_ipv6_sysctl(Link *link) {
 311         bool enabled;
 312         int r;
 313
 314         if (link->flags & IFF_LOOPBACK)
 315                 return 0;
 316
 317         enabled = link_ipv6_enabled(link);
 318         if (enabled) {
 319                 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
 320                 if (r < 0)
 321                         return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
 322
 323                 log_link_info(link, "IPv6 successfully enabled");
 324         }
 325
 326         return 0;
 327 }
 328
 329 static bool link_is_enslaved(Link *link) {
 330         if (link->flags & IFF_SLAVE)
 331                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 332                 return true;
 333
 334         if (!link->network)
 335                 return false;
 336
 337         if (link->master_ifindex > 0 && link->network->bridge)
 338                 return true;
 339
 340         /* TODO: add conditions for other netdevs. */
 341
 342         return false;
 343 }
 344
 345 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 346         Link *master;
 347
 348         if (!netdev)
 349                 return;
 350
 351         if (netdev->ifindex <= 0)
 352                 return;
 353
 354         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 355                 return;
 356
 357         link_update_operstate(master, true);
 358 }
 359
 360 void link_update_operstate(Link *link, bool also_update_master) {
 361         LinkOperationalState operstate;
 362         LinkCarrierState carrier_state;
 363         LinkAddressState address_state;
 364         _cleanup_strv_free_ char **p = NULL;
 365         uint8_t scope = RT_SCOPE_NOWHERE;
 366         bool changed = false;
 367         Address *address;
 368         Iterator i;
 369
 370         assert(link);
 371
 372         if (link->kernel_operstate == IF_OPER_DORMANT)
 373                 carrier_state = LINK_CARRIER_STATE_DORMANT;
 374         else if (link_has_carrier(link)) {
 375                 if (link_is_enslaved(link))
 376                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
 377                 else
 378                         carrier_state = LINK_CARRIER_STATE_CARRIER;
 379         } else if (link->flags & IFF_UP)
 380                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
 381         else
 382                 carrier_state = LINK_CARRIER_STATE_OFF;
 383
 384         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
 385                 Link *slave;
 386
 387                 SET_FOREACH(slave, link->slaves, i) {
 388                         link_update_operstate(slave, false);
 389
 390                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
 391                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
 392                 }
 393         }
 394
 395         SET_FOREACH(address, link->addresses, i) {
 396                 if (!address_is_ready(address))
 397                         continue;
 398
 399                 if (address->scope < scope)
 400                         scope = address->scope;
 401         }
 402
 403         /* for operstate we also take foreign addresses into account */
 404         SET_FOREACH(address, link->addresses_foreign, i) {
 405                 if (!address_is_ready(address))
 406                         continue;
 407
 408                 if (address->scope < scope)
 409                         scope = address->scope;
 410         }
 411
 412         if (scope < RT_SCOPE_SITE)
 413                 /* universally accessible addresses found */
 414                 address_state = LINK_ADDRESS_STATE_ROUTABLE;
 415         else if (scope < RT_SCOPE_HOST)
 416                 /* only link or site local addresses found */
 417                 address_state = LINK_ADDRESS_STATE_DEGRADED;
 418         else
 419                 /* no useful addresses found */
 420                 address_state = LINK_ADDRESS_STATE_OFF;
 421
 422         /* Mapping of address and carrier state vs operational state
 423          *                                                     carrier state
 424          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 425          *                 ------------------------------------------------------------------------------
 426          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 427          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
 428          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
 429          */
 430
 431         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
 432                 operstate = (LinkOperationalState) carrier_state;
 433         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
 434                 operstate = LINK_OPERSTATE_ROUTABLE;
 435         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
 436                 operstate = LINK_OPERSTATE_DEGRADED;
 437         else
 438                 operstate = LINK_OPERSTATE_ENSLAVED;
 439
 440         if (link->carrier_state != carrier_state) {
 441                 link->carrier_state = carrier_state;
 442                 changed = true;
 443                 if (strv_extend(&p, "CarrierState") < 0)
 444                         log_oom();
 445         }
 446
 447         if (link->address_state != address_state) {
 448                 link->address_state = address_state;
 449                 changed = true;
 450                 if (strv_extend(&p, "AddressState") < 0)
 451                         log_oom();
 452         }
 453
 454         if (link->operstate != operstate) {
 455                 link->operstate = operstate;
 456                 changed = true;
 457                 if (strv_extend(&p, "OperationalState") < 0)
 458                         log_oom();
 459         }
 460
 461         if (p)
 462                 link_send_changed_strv(link, p);
 463         if (changed)
 464                 link_dirty(link);
 465
 466         if (also_update_master && link->network) {
 467                 link_update_master_operstate(link, link->network->bond);
 468                 link_update_master_operstate(link, link->network->bridge);
 469         }
 470 }
 471
 472 #define FLAG_STRING(string, flag, old, new) \
 473         (((old ^ new) & flag) \
 474                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 475                 : "")
 476
 477 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 478         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 479         uint8_t operstate;
 480         int r;
 481
 482         assert(link);
 483
 484         r = sd_rtnl_message_link_get_flags(m, &flags);
 485         if (r < 0)
 486                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 487
 488         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 489         if (r < 0)
 490                 /* if we got a message without operstate, take it to mean
 491                    the state was unchanged */
 492                 operstate = link->kernel_operstate;
 493
 494         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 495                 return 0;
 496
 497         if (link->flags != flags) {
 498                 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",
 499                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 500                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 501                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 502                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 503                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 504                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 505                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 506                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 507                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 508                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 509                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 510                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 511                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 512                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 513                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 514                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 515                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 516                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 517                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 518
 519                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 520                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 521                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 522                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 523                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 524                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 525                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 526                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 527
 528                 /* link flags are currently at most 18 bits, let's align to
 529                  * printing 20 */
 530                 if (unknown_flags_added)
 531                         log_link_debug(link,
 532                                        "Unknown link flags gained: %#.5x (ignoring)",
 533                                        unknown_flags_added);
 534
 535                 if (unknown_flags_removed)
 536                         log_link_debug(link,
 537                                        "Unknown link flags lost: %#.5x (ignoring)",
 538                                        unknown_flags_removed);
 539         }
 540
 541         link->flags = flags;
 542         link->kernel_operstate = operstate;
 543
 544         link_update_operstate(link, true);
 545
 546         return 0;
 547 }
 548
 549 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 550         _cleanup_(link_unrefp) Link *link = NULL;
 551         const char *ifname, *kind = NULL;
 552         unsigned short iftype;
 553         int r, ifindex;
 554         uint16_t type;
 555
 556         assert(manager);
 557         assert(message);
 558         assert(ret);
 559
 560         /* check for link kind */
 561         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 562         if (r == 0) {
 563                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 564                 r = sd_netlink_message_exit_container(message);
 565                 if (r < 0)
 566                         return r;
 567         }
 568
 569         r = sd_netlink_message_get_type(message, &type);
 570         if (r < 0)
 571                 return r;
 572         else if (type != RTM_NEWLINK)
 573                 return -EINVAL;
 574
 575         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 576         if (r < 0)
 577                 return r;
 578         else if (ifindex <= 0)
 579                 return -EINVAL;
 580
 581         r = sd_rtnl_message_link_get_type(message, &iftype);
 582         if (r < 0)
 583                 return r;
 584
 585         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 586         if (r < 0)
 587                 return r;
 588
 589         link = new(Link, 1);
 590         if (!link)
 591                 return -ENOMEM;
 592
 593         *link = (Link) {
 594                 .n_ref = 1,
 595                 .manager = manager,
 596                 .state = LINK_STATE_PENDING,
 597                 .ifindex = ifindex,
 598                 .iftype = iftype,
 599
 600                 .n_dns = (unsigned) -1,
 601                 .dns_default_route = -1,
 602                 .llmnr = _RESOLVE_SUPPORT_INVALID,
 603                 .mdns = _RESOLVE_SUPPORT_INVALID,
 604                 .dnssec_mode = _DNSSEC_MODE_INVALID,
 605                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
 606         };
 607
 608         link->ifname = strdup(ifname);
 609         if (!link->ifname)
 610                 return -ENOMEM;
 611
 612         if (kind) {
 613                 link->kind = strdup(kind);
 614                 if (!link->kind)
 615                         return -ENOMEM;
 616         }
 617
 618         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 619         if (r < 0)
 620                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 621
 622         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 623         if (r < 0)
 624                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 625
 626         r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
 627         if (r < 0)
 628                 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
 629
 630         r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
 631         if (r < 0)
 632                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
 633
 634         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
 635         if (r < 0 && r != -ENODATA)
 636                 return r;
 637
 638         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 639                 return -ENOMEM;
 640
 641         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 642                 return -ENOMEM;
 643
 644         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 645                 return -ENOMEM;
 646
 647         r = hashmap_ensure_allocated(&manager->links, NULL);
 648         if (r < 0)
 649                 return r;
 650
 651         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 652         if (r < 0)
 653                 return r;
 654
 655         r = link_update_flags(link, message, false);
 656         if (r < 0)
 657                 return r;
 658
 659         *ret = TAKE_PTR(link);
 660
 661         return 0;
 662 }
 663
 664 void link_ntp_settings_clear(Link *link) {
 665         link->ntp = strv_free(link->ntp);
 666 }
 667
 668 void link_dns_settings_clear(Link *link) {
 669         link->dns = mfree(link->dns);
 670         link->n_dns = (unsigned) -1;
 671
 672         link->search_domains = ordered_set_free_free(link->search_domains);
 673         link->route_domains = ordered_set_free_free(link->route_domains);
 674
 675         link->dns_default_route = -1;
 676         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 677         link->mdns = _RESOLVE_SUPPORT_INVALID;
 678         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 679         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 680
 681         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 682 }
 683
 684 static void link_free_engines(Link *link) {
 685         if (!link)
 686                 return;
 687
 688         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 689         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 690         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 691         link->dhcp_routes = set_free(link->dhcp_routes);
 692
 693         link->lldp = sd_lldp_unref(link->lldp);
 694
 695         ndisc_flush(link);
 696
 697         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 698         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 699         link->ndisc = sd_ndisc_unref(link->ndisc);
 700         link->radv = sd_radv_unref(link->radv);
 701 }
 702
 703 static Link *link_free(Link *link) {
 704         Address *address;
 705
 706         assert(link);
 707
 708         link_ntp_settings_clear(link);
 709         link_dns_settings_clear(link);
 710
 711         link->routes = set_free_with_destructor(link->routes, route_free);
 712         link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
 713
 714         link->nexthops = set_free_with_destructor(link->nexthops, nexthop_free);
 715         link->nexthops_foreign = set_free_with_destructor(link->nexthops_foreign, nexthop_free);
 716
 717         link->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
 718         link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
 719
 720         link->addresses = set_free_with_destructor(link->addresses, address_free);
 721         link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
 722
 723         while ((address = link->pool_addresses)) {
 724                 LIST_REMOVE(addresses, link->pool_addresses, address);
 725                 address_free(address);
 726         }
 727
 728         link_lldp_emit_stop(link);
 729         link_free_engines(link);
 730         free(link->lease_file);
 731         free(link->lldp_file);
 732
 733         free(link->ifname);
 734         strv_free(link->alternative_names);
 735         free(link->kind);
 736         free(link->ssid);
 737         free(link->driver);
 738
 739         (void) unlink(link->state_file);
 740         free(link->state_file);
 741
 742         sd_device_unref(link->sd_device);
 743
 744         hashmap_free(link->bound_to_links);
 745         hashmap_free(link->bound_by_links);
 746
 747         set_free_with_destructor(link->slaves, link_unref);
 748
 749         network_unref(link->network);
 750
 751         return mfree(link);
 752 }
 753
 754 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 755
 756 int link_get(Manager *m, int ifindex, Link **ret) {
 757         Link *link;
 758
 759         assert(m);
 760         assert(ifindex > 0);
 761         assert(ret);
 762
 763         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 764         if (!link)
 765                 return -ENODEV;
 766
 767         *ret = link;
 768
 769         return 0;
 770 }
 771
 772 void link_set_state(Link *link, LinkState state) {
 773         assert(link);
 774
 775         if (link->state == state)
 776                 return;
 777
 778         log_link_debug(link, "State changed: %s -> %s",
 779                        link_state_to_string(link->state),
 780                        link_state_to_string(state));
 781
 782         link->state = state;
 783
 784         link_send_changed(link, "AdministrativeState", NULL);
 785 }
 786
 787 static void link_enter_unmanaged(Link *link) {
 788         assert(link);
 789
 790         link_set_state(link, LINK_STATE_UNMANAGED);
 791
 792         link_dirty(link);
 793 }
 794
 795 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 796         int r = 0, k;
 797         Address *ad;
 798
 799         assert(link);
 800         assert(link->manager);
 801         assert(link->manager->event);
 802
 803         dhcp4_release_old_lease(link);
 804
 805         bool keep_dhcp = may_keep_dhcp &&
 806                          link->network &&
 807                          (link->manager->restarting ||
 808                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 809
 810         if (link->dhcp_client && !keep_dhcp) {
 811                 k = sd_dhcp_client_stop(link->dhcp_client);
 812                 if (k < 0)
 813                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 814         }
 815
 816         if (link->ipv4ll) {
 817                 k = sd_ipv4ll_stop(link->ipv4ll);
 818                 if (k < 0)
 819                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 820         }
 821
 822         if (link->network)
 823                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 824                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 825                                 k = sd_ipv4acd_stop(ad->acd);
 826                                 if (k < 0)
 827                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 828                         }
 829
 830         if (link->dhcp6_client) {
 831                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 832                 if (k < 0)
 833                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 834         }
 835
 836         if (link->ndisc) {
 837                 k = sd_ndisc_stop(link->ndisc);
 838                 if (k < 0)
 839                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 840         }
 841
 842         if (link->radv) {
 843                 k = sd_radv_stop(link->radv);
 844                 if (k < 0)
 845                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 846         }
 847
 848         link_lldp_emit_stop(link);
 849         return r;
 850 }
 851
 852 void link_enter_failed(Link *link) {
 853         assert(link);
 854
 855         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 856                 return;
 857
 858         log_link_warning(link, "Failed");
 859
 860         link_set_state(link, LINK_STATE_FAILED);
 861
 862         link_stop_clients(link, false);
 863
 864         link_dirty(link);
 865 }
 866
 867 static int link_join_netdevs_after_configured(Link *link) {
 868         NetDev *netdev;
 869         Iterator i;
 870         int r;
 871
 872         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 873                 if (netdev->ifindex > 0)
 874                         /* Assume already enslaved. */
 875                         continue;
 876
 877                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 878                         continue;
 879
 880                 log_struct(LOG_DEBUG,
 881                            LOG_LINK_INTERFACE(link),
 882                            LOG_NETDEV_INTERFACE(netdev),
 883                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 884
 885                 r = netdev_join(netdev, link, NULL);
 886                 if (r < 0)
 887                         return log_struct_errno(LOG_WARNING, r,
 888                                                 LOG_LINK_INTERFACE(link),
 889                                                 LOG_NETDEV_INTERFACE(netdev),
 890                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 891         }
 892
 893         return 0;
 894 }
 895
 896 static void link_enter_configured(Link *link) {
 897         assert(link);
 898         assert(link->network);
 899
 900         if (link->state != LINK_STATE_CONFIGURING)
 901                 return;
 902
 903         link_set_state(link, LINK_STATE_CONFIGURED);
 904
 905         (void) link_join_netdevs_after_configured(link);
 906
 907         link_dirty(link);
 908 }
 909
 910 static int link_request_set_routing_policy_rule(Link *link) {
 911         RoutingPolicyRule *rule, *rrule = NULL;
 912         int r;
 913
 914         assert(link);
 915         assert(link->network);
 916
 917         link->routing_policy_rules_configured = false;
 918
 919         LIST_FOREACH(rules, rule, link->network->rules) {
 920                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 921                 if (r >= 0) {
 922                         if (r == 0)
 923                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 924                         continue;
 925                 }
 926
 927                 r = routing_policy_rule_configure(rule, link, NULL);
 928                 if (r < 0)
 929                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 930                 if (r > 0)
 931                         link->routing_policy_rule_messages++;
 932         }
 933
 934         routing_policy_rule_purge(link->manager, link);
 935         if (link->routing_policy_rule_messages == 0) {
 936                 link->routing_policy_rules_configured = true;
 937                 link_check_ready(link);
 938         } else {
 939                 log_link_debug(link, "Setting routing policy rules");
 940                 link_set_state(link, LINK_STATE_CONFIGURING);
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 947         int r;
 948
 949         assert(link);
 950         assert(link->nexthop_messages > 0);
 951         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 952                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 953
 954         link->nexthop_messages--;
 955
 956         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 957                 return 1;
 958
 959         r = sd_netlink_message_get_errno(m);
 960         if (r < 0 && r != -EEXIST) {
 961                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 962                 link_enter_failed(link);
 963                 return 1;
 964         }
 965
 966         if (link->nexthop_messages == 0) {
 967                 log_link_debug(link, "Nexthop set");
 968                 link->static_nexthops_configured = true;
 969                 link_check_ready(link);
 970         }
 971
 972         return 1;
 973 }
 974
 975 static int link_request_set_nexthop(Link *link) {
 976         NextHop *nh;
 977         int r;
 978
 979         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 980                 r = nexthop_configure(nh, link, nexthop_handler);
 981                 if (r < 0)
 982                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 983                 if (r > 0)
 984                         link->nexthop_messages++;
 985         }
 986
 987         if (link->nexthop_messages == 0) {
 988                 link->static_nexthops_configured = true;
 989                 link_check_ready(link);
 990         } else {
 991                 log_link_debug(link, "Setting nexthop");
 992                 link_set_state(link, LINK_STATE_CONFIGURING);
 993         }
 994
 995         return 1;
 996 }
 997
 998 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 999         int r;
1000
1001         assert(link);
1002         assert(link->route_messages > 0);
1003         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1004                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1005
1006         link->route_messages--;
1007
1008         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1009                 return 1;
1010
1011         r = sd_netlink_message_get_errno(m);
1012         if (r < 0 && r != -EEXIST) {
1013                 log_link_message_warning_errno(link, m, r, "Could not set route");
1014                 link_enter_failed(link);
1015                 return 1;
1016         }
1017
1018         if (link->route_messages == 0) {
1019                 log_link_debug(link, "Routes set");
1020                 link->static_routes_configured = true;
1021                 link_check_ready(link);
1022         }
1023
1024         return 1;
1025 }
1026
1027 int link_request_set_routes(Link *link) {
1028         enum {
1029                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1030                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1031                 _PHASE_MAX
1032         } phase;
1033         Route *rt;
1034         int r;
1035
1036         assert(link);
1037         assert(link->network);
1038         assert(link->addresses_configured);
1039         assert(link->address_messages == 0);
1040         assert(link->state != _LINK_STATE_INVALID);
1041
1042         link->static_routes_configured = false;
1043         link->static_routes_ready = false;
1044
1045         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1046                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1047                  * the addresses now, let's not configure the routes either. */
1048                 return 0;
1049
1050         r = link_request_set_routing_policy_rule(link);
1051         if (r < 0)
1052                 return r;
1053
1054         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1055         for (phase = 0; phase < _PHASE_MAX; phase++)
1056                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1057                         if (rt->gateway_from_dhcp)
1058                                 continue;
1059
1060                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1061                                 continue;
1062
1063                         r = route_configure(rt, link, route_handler);
1064                         if (r < 0)
1065                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1066                         if (r > 0)
1067                                 link->route_messages++;
1068                 }
1069
1070         if (link->route_messages == 0) {
1071                 link->static_routes_configured = true;
1072                 link_check_ready(link);
1073         } else {
1074                 log_link_debug(link, "Setting routes");
1075                 link_set_state(link, LINK_STATE_CONFIGURING);
1076         }
1077
1078         return 0;
1079 }
1080
1081 void link_check_ready(Link *link) {
1082         Address *a;
1083         Iterator i;
1084         int r;
1085
1086         assert(link);
1087
1088         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1089                 log_link_debug(link, "%s(): link is in failed or linger state.", __func__);
1090                 return;
1091         }
1092
1093         if (!link->network)
1094                 return;
1095
1096         if (!link->addresses_configured) {
1097                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1098                 return;
1099         }
1100
1101         if (!link->neighbors_configured) {
1102                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1103                 return;
1104         }
1105
1106         SET_FOREACH(a, link->addresses, i)
1107                 if (!address_is_ready(a)) {
1108                         _cleanup_free_ char *str = NULL;
1109
1110                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1111                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1112                         return;
1113                 }
1114
1115         if (!link->addresses_ready) {
1116                 link->addresses_ready = true;
1117                 r = link_request_set_routes(link);
1118                 if (r < 0)
1119                         link_enter_failed(link);
1120                 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1121                 return;
1122         }
1123
1124         if (!link->static_routes_configured) {
1125                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1126                 return;
1127         }
1128
1129         if (!link->static_routes_ready) {
1130                 link->static_routes_ready = true;
1131                 r = link_request_set_nexthop(link);
1132                 if (r < 0)
1133                         link_enter_failed(link);
1134                 log_link_debug(link, "%s(): static routes are configured. Configuring static nexthops.", __func__);
1135                 return;
1136         }
1137
1138         if (!link->static_nexthops_configured) {
1139                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1140                 return;
1141         }
1142
1143         if (!link->routing_policy_rules_configured) {
1144                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1145                 return;
1146         }
1147
1148         if (!link->tc_configured) {
1149                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1150                 return;
1151         }
1152
1153         if (!link->sr_iov_configured) {
1154                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1155                 return;
1156         }
1157
1158         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1159
1160                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address) {
1161                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1162                         return;
1163                 }
1164
1165                 if (link_ipv6ll_enabled(link) &&
1166                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1167                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1168                         return;
1169                 }
1170
1171                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
1172                         if (!link->dhcp4_configured &&
1173                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1174                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1175                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1176                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address)) {
1177                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1178                                  * an IPv4ll fallback address must be configured. */
1179                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1180                                 return;
1181                         }
1182
1183                         log_link_debug(link, "%s(): dhcp4:%s dhcp6_addresses:%s dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
1184                                        __func__,
1185                                        yes_no(link->dhcp4_configured),
1186                                        yes_no(link->dhcp6_address_configured),
1187                                        yes_no(link->dhcp6_route_configured),
1188                                        yes_no(link->dhcp6_pd_address_configured),
1189                                        yes_no(link->dhcp6_pd_route_configured),
1190                                        yes_no(link->ndisc_addresses_configured),
1191                                        yes_no(link->ndisc_routes_configured));
1192                 }
1193         }
1194
1195         if (link->state != LINK_STATE_CONFIGURED)
1196                 link_enter_configured(link);
1197
1198         return;
1199 }
1200
1201 static int link_request_set_neighbors(Link *link) {
1202         Neighbor *neighbor;
1203         int r;
1204
1205         assert(link);
1206         assert(link->network);
1207         assert(link->state != _LINK_STATE_INVALID);
1208
1209         link->neighbors_configured = false;
1210
1211         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1212                 r = neighbor_configure(neighbor, link, NULL);
1213                 if (r < 0)
1214                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1215         }
1216
1217         if (link->neighbor_messages == 0) {
1218                 link->neighbors_configured = true;
1219                 link_check_ready(link);
1220         } else {
1221                 log_link_debug(link, "Setting neighbors");
1222                 link_set_state(link, LINK_STATE_CONFIGURING);
1223         }
1224
1225         return 0;
1226 }
1227
1228 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1229         int r;
1230
1231         assert(rtnl);
1232         assert(m);
1233         assert(link);
1234         assert(link->ifname);
1235         assert(link->address_messages > 0);
1236         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1237                LINK_STATE_FAILED, LINK_STATE_LINGER));
1238
1239         link->address_messages--;
1240
1241         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1242                 return 1;
1243
1244         r = sd_netlink_message_get_errno(m);
1245         if (r < 0 && r != -EEXIST) {
1246                 log_link_message_warning_errno(link, m, r, "Could not set address");
1247                 link_enter_failed(link);
1248                 return 1;
1249         } else if (r >= 0)
1250                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1251
1252         if (link->address_messages == 0) {
1253                 log_link_debug(link, "Addresses set");
1254                 link->addresses_configured = true;
1255                 link_check_ready(link);
1256         }
1257
1258         return 1;
1259 }
1260
1261 static int link_set_bridge_fdb(Link *link) {
1262         FdbEntry *fdb_entry;
1263         int r;
1264
1265         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1266                 r = fdb_entry_configure(link, fdb_entry);
1267                 if (r < 0)
1268                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1269         }
1270
1271         return 0;
1272 }
1273
1274 static int link_request_set_addresses(Link *link) {
1275         AddressLabel *label;
1276         Address *ad;
1277         Prefix *p;
1278         int r;
1279
1280         assert(link);
1281         assert(link->network);
1282         assert(link->state != _LINK_STATE_INVALID);
1283
1284         /* Reset all *_configured flags we are configuring. */
1285         link->addresses_configured = false;
1286         link->addresses_ready = false;
1287         link->neighbors_configured = false;
1288         link->static_routes_configured = false;
1289         link->static_routes_ready = false;
1290         link->static_nexthops_configured = false;
1291         link->routing_policy_rules_configured = false;
1292
1293         r = link_set_bridge_fdb(link);
1294         if (r < 0)
1295                 return r;
1296
1297         r = link_request_set_neighbors(link);
1298         if (r < 0)
1299                 return r;
1300
1301         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1302                 bool update;
1303
1304                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1305
1306                 r = address_configure(ad, link, address_handler, update);
1307                 if (r < 0)
1308                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1309                 if (r > 0)
1310                         link->address_messages++;
1311         }
1312
1313         if (IN_SET(link->network->router_prefix_delegation,
1314                    RADV_PREFIX_DELEGATION_STATIC,
1315                    RADV_PREFIX_DELEGATION_BOTH))
1316                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1317                         _cleanup_(address_freep) Address *address = NULL;
1318
1319                         if (!p->assign)
1320                                 continue;
1321
1322                         r = address_new(&address);
1323                         if (r < 0)
1324                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1325
1326                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1327                         if (r < 0)
1328                                 return r;
1329
1330                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1331                         if (r < 0)
1332                                 return r;
1333
1334                         address->family = AF_INET6;
1335                         r = address_configure(address, link, address_handler, true);
1336                         if (r < 0)
1337                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1338                         if (r > 0)
1339                                 link->address_messages++;
1340                 }
1341
1342         LIST_FOREACH(labels, label, link->network->address_labels) {
1343                 r = address_label_configure(label, link, NULL, false);
1344                 if (r < 0)
1345                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1346
1347                 link->address_label_messages++;
1348         }
1349
1350         /* now that we can figure out a default address for the dhcp server,
1351            start it */
1352         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1353                 r = dhcp4_server_configure(link);
1354                 if (r < 0)
1355                         return r;
1356                 log_link_debug(link, "Offering DHCPv4 leases");
1357         }
1358
1359         if (link->address_messages == 0) {
1360                 link->addresses_configured = true;
1361                 link_check_ready(link);
1362         } else {
1363                 log_link_debug(link, "Setting addresses");
1364                 link_set_state(link, LINK_STATE_CONFIGURING);
1365         }
1366
1367         return 0;
1368 }
1369
1370 static int link_set_bridge_vlan(Link *link) {
1371         int r;
1372
1373         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1374         if (r < 0)
1375                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1376
1377         return r;
1378 }
1379
1380 static int link_set_proxy_arp(Link *link) {
1381         int r;
1382
1383         if (!link_proxy_arp_enabled(link))
1384                 return 0;
1385
1386         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1387         if (r < 0)
1388                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1389
1390         return 0;
1391 }
1392
1393 static int link_configure_continue(Link *link);
1394
1395 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1396         int r;
1397
1398         assert(m);
1399         assert(link);
1400         assert(link->ifname);
1401
1402         link->setting_mtu = false;
1403
1404         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1405                 return 1;
1406
1407         r = sd_netlink_message_get_errno(m);
1408         if (r < 0)
1409                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1410         else
1411                 log_link_debug(link, "Setting MTU done.");
1412
1413         if (link->state == LINK_STATE_INITIALIZED) {
1414                 r = link_configure_continue(link);
1415                 if (r < 0)
1416                         link_enter_failed(link);
1417         }
1418
1419         return 1;
1420 }
1421
1422 int link_set_mtu(Link *link, uint32_t mtu) {
1423         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1424         int r;
1425
1426         assert(link);
1427         assert(link->manager);
1428         assert(link->manager->rtnl);
1429
1430         if (mtu == 0 || link->setting_mtu)
1431                 return 0;
1432
1433         if (link->mtu == mtu)
1434                 return 0;
1435
1436         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1437
1438         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1439         if (r < 0)
1440                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1441
1442         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1443          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1444         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1445
1446                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1447                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1448
1449                 mtu = IPV6_MIN_MTU;
1450         }
1451
1452         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1453         if (r < 0)
1454                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1455
1456         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1457                                link_netlink_destroy_callback, link);
1458         if (r < 0)
1459                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1460
1461         link_ref(link);
1462         link->setting_mtu = true;
1463
1464         return 0;
1465 }
1466
1467 static bool link_reduces_vlan_mtu(Link *link) {
1468         /* See netif_reduces_vlan_mtu() in kernel. */
1469         return streq_ptr(link->kind, "macsec");
1470 }
1471
1472 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1473         uint32_t mtu = 0;
1474         NetDev *dev;
1475         Iterator i;
1476
1477         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1478                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1479                         /* See vlan_dev_change_mtu() in kernel. */
1480                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1481
1482                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1483                         /* See macvlan_change_mtu() in kernel. */
1484                         mtu = dev->mtu;
1485
1486         return mtu;
1487 }
1488
1489 static int link_configure_mtu(Link *link) {
1490         uint32_t mtu;
1491
1492         assert(link);
1493         assert(link->network);
1494
1495         if (link->network->mtu > 0)
1496                 return link_set_mtu(link, link->network->mtu);
1497
1498         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1499         if (link->mtu >= mtu)
1500                 return 0;
1501
1502         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1503                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1504                         link->mtu, mtu);
1505
1506         return link_set_mtu(link, mtu);
1507 }
1508
1509 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1510         int r;
1511
1512         assert(m);
1513         assert(link);
1514         assert(link->ifname);
1515
1516         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1517                 return 1;
1518
1519         r = sd_netlink_message_get_errno(m);
1520         if (r < 0)
1521                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1522
1523         return 1;
1524 }
1525
1526 static int link_set_flags(Link *link) {
1527         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1528         unsigned ifi_change = 0;
1529         unsigned ifi_flags = 0;
1530         int r;
1531
1532         assert(link);
1533         assert(link->manager);
1534         assert(link->manager->rtnl);
1535
1536         if (link->flags & IFF_LOOPBACK)
1537                 return 0;
1538
1539         if (!link->network)
1540                 return 0;
1541
1542         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1543                 return 0;
1544
1545         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1546         if (r < 0)
1547                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1548
1549         if (link->network->arp >= 0) {
1550                 ifi_change |= IFF_NOARP;
1551                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1552         }
1553
1554         if (link->network->multicast >= 0) {
1555                 ifi_change |= IFF_MULTICAST;
1556                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1557         }
1558
1559         if (link->network->allmulticast >= 0) {
1560                 ifi_change |= IFF_ALLMULTI;
1561                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1562         }
1563
1564         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1565         if (r < 0)
1566                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1567
1568         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1569                                link_netlink_destroy_callback, link);
1570         if (r < 0)
1571                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1572
1573         link_ref(link);
1574
1575         return 0;
1576 }
1577
1578 static int link_acquire_ipv6_conf(Link *link) {
1579         int r;
1580
1581         assert(link);
1582
1583         if (link_ipv6_accept_ra_enabled(link)) {
1584                 assert(link->ndisc);
1585
1586                 log_link_debug(link, "Discovering IPv6 routers");
1587
1588                 r = sd_ndisc_start(link->ndisc);
1589                 if (r < 0 && r != -EBUSY)
1590                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1591         }
1592
1593         if (link_radv_enabled(link)) {
1594                 assert(link->radv);
1595                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1596
1597                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1598
1599                 r = radv_emit_dns(link);
1600                 if (r < 0)
1601                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1602
1603                 r = sd_radv_start(link->radv);
1604                 if (r < 0 && r != -EBUSY)
1605                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1606         }
1607
1608         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1609                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1610                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1611                 assert(link->dhcp6_client);
1612                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1613
1614                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1615                 if (r < 0 && r != -EBUSY)
1616                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1617                 else
1618                         log_link_debug(link, "Acquiring DHCPv6 lease");
1619         }
1620
1621         (void) dhcp6_request_prefix_delegation(link);
1622
1623         return 0;
1624 }
1625
1626 static int link_acquire_ipv4_conf(Link *link) {
1627         int r;
1628
1629         assert(link);
1630         assert(link->manager);
1631         assert(link->manager->event);
1632
1633         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1634                 assert(link->ipv4ll);
1635
1636                 log_link_debug(link, "Acquiring IPv4 link-local address");
1637
1638                 r = sd_ipv4ll_start(link->ipv4ll);
1639                 if (r < 0)
1640                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1641         }
1642
1643         if (link_dhcp4_enabled(link)) {
1644                 assert(link->dhcp_client);
1645
1646                 log_link_debug(link, "Acquiring DHCPv4 lease");
1647
1648                 r = sd_dhcp_client_start(link->dhcp_client);
1649                 if (r < 0)
1650                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1651         }
1652
1653         return 0;
1654 }
1655
1656 static int link_acquire_conf(Link *link) {
1657         int r;
1658
1659         assert(link);
1660
1661         r = link_acquire_ipv4_conf(link);
1662         if (r < 0)
1663                 return r;
1664
1665         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1666                 r = link_acquire_ipv6_conf(link);
1667                 if (r < 0)
1668                         return r;
1669         }
1670
1671         if (link_lldp_emit_enabled(link)) {
1672                 r = link_lldp_emit_start(link);
1673                 if (r < 0)
1674                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1675         }
1676
1677         return 0;
1678 }
1679
1680 bool link_has_carrier(Link *link) {
1681         /* see Documentation/networking/operstates.txt in the kernel sources */
1682
1683         if (link->kernel_operstate == IF_OPER_UP)
1684                 return true;
1685
1686         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1687                 /* operstate may not be implemented, so fall back to flags */
1688                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1689                     !FLAGS_SET(link->flags, IFF_DORMANT))
1690                         return true;
1691
1692         return false;
1693 }
1694
1695 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1696         int r;
1697
1698         assert(link);
1699
1700         link->setting_genmode = false;
1701
1702         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1703                 return 1;
1704
1705         r = sd_netlink_message_get_errno(m);
1706         if (r < 0)
1707                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1708         else
1709                 log_link_debug(link, "Setting address genmode done.");
1710
1711         if (link->state == LINK_STATE_INITIALIZED) {
1712                 r = link_configure_continue(link);
1713                 if (r < 0)
1714                         link_enter_failed(link);
1715         }
1716
1717         return 1;
1718 }
1719
1720 static int link_configure_addrgen_mode(Link *link) {
1721         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1722         uint8_t ipv6ll_mode;
1723         int r;
1724
1725         assert(link);
1726         assert(link->network);
1727         assert(link->manager);
1728         assert(link->manager->rtnl);
1729
1730         if (!socket_ipv6_is_supported() || link->setting_genmode)
1731                 return 0;
1732
1733         log_link_debug(link, "Setting address genmode for link");
1734
1735         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1736         if (r < 0)
1737                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1738
1739         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1740         if (r < 0)
1741                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1742
1743         r = sd_netlink_message_open_container(req, AF_INET6);
1744         if (r < 0)
1745                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1746
1747         if (!link_ipv6ll_enabled(link))
1748                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1749         else if (link->network->ipv6ll_address_gen_mode < 0) {
1750                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1751                 if (r < 0) {
1752                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1753                          * reading the file fails with EIO. */
1754                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1755
1756                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1757                 } else
1758                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1759         } else
1760                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1761
1762         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1763         if (r < 0)
1764                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1765
1766         r = sd_netlink_message_close_container(req);
1767         if (r < 0)
1768                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1769
1770         r = sd_netlink_message_close_container(req);
1771         if (r < 0)
1772                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1773
1774         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1775                                link_netlink_destroy_callback, link);
1776         if (r < 0)
1777                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1778
1779         link_ref(link);
1780         link->setting_genmode = true;
1781
1782         return 0;
1783 }
1784
1785 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1786         int r;
1787
1788         assert(link);
1789
1790         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1791                 return 1;
1792
1793         r = sd_netlink_message_get_errno(m);
1794         if (r < 0)
1795                 /* we warn but don't fail the link, as it may be brought up later */
1796                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1797
1798         return 1;
1799 }
1800
1801 static int link_up(Link *link) {
1802         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1803         int r;
1804
1805         assert(link);
1806         assert(link->network);
1807         assert(link->manager);
1808         assert(link->manager->rtnl);
1809
1810         log_link_debug(link, "Bringing link up");
1811
1812         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1813         if (r < 0)
1814                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1815
1816         /* set it free if not enslaved with networkd */
1817         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1818                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1819                 if (r < 0)
1820                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1821         }
1822
1823         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1824         if (r < 0)
1825                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1826
1827         if (link->network->mac) {
1828                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1829                 if (r < 0)
1830                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1831         }
1832
1833         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1834                                link_netlink_destroy_callback, link);
1835         if (r < 0)
1836                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1837
1838         link_ref(link);
1839
1840         return 0;
1841 }
1842
1843 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1844         int r;
1845
1846         assert(link);
1847
1848         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1849                 return 1;
1850
1851         r = sd_netlink_message_get_errno(m);
1852         if (r < 0)
1853                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1854
1855         return 1;
1856 }
1857
1858 int link_down(Link *link, link_netlink_message_handler_t callback) {
1859         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1860         int r;
1861
1862         assert(link);
1863         assert(link->manager);
1864         assert(link->manager->rtnl);
1865
1866         log_link_debug(link, "Bringing link down");
1867
1868         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1869                                      RTM_SETLINK, link->ifindex);
1870         if (r < 0)
1871                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1872
1873         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1874         if (r < 0)
1875                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1876
1877         r = netlink_call_async(link->manager->rtnl, NULL, req,
1878                                callback ?: link_down_handler,
1879                                link_netlink_destroy_callback, link);
1880         if (r < 0)
1881                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1882
1883         link_ref(link);
1884
1885         return 0;
1886 }
1887
1888 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1889         int r;
1890
1891         assert(link);
1892
1893         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1894                 return 1;
1895
1896         r = sd_netlink_message_get_errno(m);
1897         if (r < 0)
1898                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1899
1900         return 1;
1901 }
1902
1903 static int link_set_group(Link *link) {
1904         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1905         int r;
1906
1907         assert(link);
1908         assert(link->network);
1909         assert(link->manager);
1910         assert(link->manager->rtnl);
1911
1912         if (link->network->group <= 0)
1913                 return 0;
1914
1915         log_link_debug(link, "Setting group");
1916
1917         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1918         if (r < 0)
1919                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1920
1921         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1922         if (r < 0)
1923                 return log_link_error_errno(link, r, "Could not set link group: %m");
1924
1925         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1926                                link_netlink_destroy_callback, link);
1927         if (r < 0)
1928                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1929
1930         link_ref(link);
1931
1932         return 0;
1933 }
1934
1935 static int link_handle_bound_to_list(Link *link) {
1936         Link *l;
1937         Iterator i;
1938         int r;
1939         bool required_up = false;
1940         bool link_is_up = false;
1941
1942         assert(link);
1943
1944         if (hashmap_isempty(link->bound_to_links))
1945                 return 0;
1946
1947         if (link->flags & IFF_UP)
1948                 link_is_up = true;
1949
1950         HASHMAP_FOREACH (l, link->bound_to_links, i)
1951                 if (link_has_carrier(l)) {
1952                         required_up = true;
1953                         break;
1954                 }
1955
1956         if (!required_up && link_is_up) {
1957                 r = link_down(link, NULL);
1958                 if (r < 0)
1959                         return r;
1960         } else if (required_up && !link_is_up) {
1961                 r = link_up(link);
1962                 if (r < 0)
1963                         return r;
1964         }
1965
1966         return 0;
1967 }
1968
1969 static int link_handle_bound_by_list(Link *link) {
1970         Iterator i;
1971         Link *l;
1972         int r;
1973
1974         assert(link);
1975
1976         if (hashmap_isempty(link->bound_by_links))
1977                 return 0;
1978
1979         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1980                 r = link_handle_bound_to_list(l);
1981                 if (r < 0)
1982                         return r;
1983         }
1984
1985         return 0;
1986 }
1987
1988 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1989         int r;
1990
1991         assert(link);
1992         assert(carrier);
1993
1994         if (link == carrier)
1995                 return 0;
1996
1997         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1998                 return 0;
1999
2000         r = hashmap_ensure_allocated(h, NULL);
2001         if (r < 0)
2002                 return r;
2003
2004         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2005         if (r < 0)
2006                 return r;
2007
2008         return 0;
2009 }
2010
2011 static int link_new_bound_by_list(Link *link) {
2012         Manager *m;
2013         Link *carrier;
2014         Iterator i;
2015         int r;
2016         bool list_updated = false;
2017
2018         assert(link);
2019         assert(link->manager);
2020
2021         m = link->manager;
2022
2023         HASHMAP_FOREACH(carrier, m->links, i) {
2024                 if (!carrier->network)
2025                         continue;
2026
2027                 if (strv_isempty(carrier->network->bind_carrier))
2028                         continue;
2029
2030                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2031                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2032                         if (r < 0)
2033                                 return r;
2034
2035                         list_updated = true;
2036                 }
2037         }
2038
2039         if (list_updated)
2040                 link_dirty(link);
2041
2042         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2043                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2044                 if (r < 0)
2045                         return r;
2046
2047                 link_dirty(carrier);
2048         }
2049
2050         return 0;
2051 }
2052
2053 static int link_new_bound_to_list(Link *link) {
2054         Manager *m;
2055         Link *carrier;
2056         Iterator i;
2057         int r;
2058         bool list_updated = false;
2059
2060         assert(link);
2061         assert(link->manager);
2062
2063         if (!link->network)
2064                 return 0;
2065
2066         if (strv_isempty(link->network->bind_carrier))
2067                 return 0;
2068
2069         m = link->manager;
2070
2071         HASHMAP_FOREACH (carrier, m->links, i) {
2072                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2073                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2074                         if (r < 0)
2075                                 return r;
2076
2077                         list_updated = true;
2078                 }
2079         }
2080
2081         if (list_updated)
2082                 link_dirty(link);
2083
2084         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2085                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2086                 if (r < 0)
2087                         return r;
2088
2089                 link_dirty(carrier);
2090         }
2091
2092         return 0;
2093 }
2094
2095 static int link_new_carrier_maps(Link *link) {
2096         int r;
2097
2098         r = link_new_bound_by_list(link);
2099         if (r < 0)
2100                 return r;
2101
2102         r = link_handle_bound_by_list(link);
2103         if (r < 0)
2104                 return r;
2105
2106         r = link_new_bound_to_list(link);
2107         if (r < 0)
2108                 return r;
2109
2110         r = link_handle_bound_to_list(link);
2111         if (r < 0)
2112                 return r;
2113
2114         return 0;
2115 }
2116
2117 static void link_free_bound_to_list(Link *link) {
2118         Link *bound_to;
2119         Iterator i;
2120
2121         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2122                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2123
2124                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2125                         link_dirty(bound_to);
2126         }
2127
2128         return;
2129 }
2130
2131 static void link_free_bound_by_list(Link *link) {
2132         Link *bound_by;
2133         Iterator i;
2134
2135         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2136                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2137
2138                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2139                         link_dirty(bound_by);
2140                         link_handle_bound_to_list(bound_by);
2141                 }
2142         }
2143
2144         return;
2145 }
2146
2147 static void link_free_carrier_maps(Link *link) {
2148         bool list_updated = false;
2149
2150         assert(link);
2151
2152         if (!hashmap_isempty(link->bound_to_links)) {
2153                 link_free_bound_to_list(link);
2154                 list_updated = true;
2155         }
2156
2157         if (!hashmap_isempty(link->bound_by_links)) {
2158                 link_free_bound_by_list(link);
2159                 list_updated = true;
2160         }
2161
2162         if (list_updated)
2163                 link_dirty(link);
2164
2165         return;
2166 }
2167
2168 static int link_append_to_master(Link *link, NetDev *netdev) {
2169         Link *master;
2170         int r;
2171
2172         assert(link);
2173         assert(netdev);
2174
2175         r = link_get(link->manager, netdev->ifindex, &master);
2176         if (r < 0)
2177                 return r;
2178
2179         r = set_ensure_put(&master->slaves, NULL, link);
2180         if (r <= 0)
2181                 return r;
2182
2183         link_ref(link);
2184         return 0;
2185 }
2186
2187 static void link_drop_from_master(Link *link, NetDev *netdev) {
2188         Link *master;
2189
2190         assert(link);
2191
2192         if (!link->manager || !netdev)
2193                 return;
2194
2195         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2196                 return;
2197
2198         link_unref(set_remove(master->slaves, link));
2199 }
2200
2201 static void link_detach_from_manager(Link *link) {
2202         if (!link || !link->manager)
2203                 return;
2204
2205         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2206         link_clean(link);
2207
2208         /* The following must be called at last. */
2209         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2210         link_unref(link);
2211 }
2212
2213 void link_drop(Link *link) {
2214         if (!link || link->state == LINK_STATE_LINGER)
2215                 return;
2216
2217         link_set_state(link, LINK_STATE_LINGER);
2218
2219         link_free_carrier_maps(link);
2220
2221         if (link->network) {
2222                 link_drop_from_master(link, link->network->bridge);
2223                 link_drop_from_master(link, link->network->bond);
2224         }
2225
2226         log_link_debug(link, "Link removed");
2227
2228         (void) unlink(link->state_file);
2229         link_detach_from_manager(link);
2230 }
2231
2232 static int link_joined(Link *link) {
2233         int r;
2234
2235         assert(link);
2236         assert(link->network);
2237
2238         if (!hashmap_isempty(link->bound_to_links)) {
2239                 r = link_handle_bound_to_list(link);
2240                 if (r < 0)
2241                         return r;
2242         } else if (!(link->flags & IFF_UP)) {
2243                 r = link_up(link);
2244                 if (r < 0) {
2245                         link_enter_failed(link);
2246                         return r;
2247                 }
2248         }
2249
2250         if (link->network->bridge) {
2251                 r = link_set_bridge(link);
2252                 if (r < 0)
2253                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2254
2255                 r = link_append_to_master(link, link->network->bridge);
2256                 if (r < 0)
2257                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2258         }
2259
2260         if (link->network->bond) {
2261                 r = link_set_bond(link);
2262                 if (r < 0)
2263                         log_link_error_errno(link, r, "Could not set bond message: %m");
2264
2265                 r = link_append_to_master(link, link->network->bond);
2266                 if (r < 0)
2267                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2268         }
2269
2270         if (link->network->use_br_vlan &&
2271             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2272                 r = link_set_bridge_vlan(link);
2273                 if (r < 0)
2274                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2275         }
2276
2277         /* Skip setting up addresses until it gets carrier,
2278            or it would try to set addresses twice,
2279            which is bad for non-idempotent steps. */
2280         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2281                 return 0;
2282
2283         link_set_state(link, LINK_STATE_CONFIGURING);
2284         return link_request_set_addresses(link);
2285 }
2286
2287 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2288         int r;
2289
2290         assert(link);
2291         assert(link->network);
2292         assert(link->enslaving > 0);
2293
2294         link->enslaving--;
2295
2296         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2297                 return 1;
2298
2299         r = sd_netlink_message_get_errno(m);
2300         if (r < 0 && r != -EEXIST) {
2301                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2302                 link_enter_failed(link);
2303                 return 1;
2304         }
2305
2306         log_link_debug(link, "Joined netdev");
2307
2308         if (link->enslaving == 0) {
2309                 r = link_joined(link);
2310                 if (r < 0)
2311                         link_enter_failed(link);
2312         }
2313
2314         return 1;
2315 }
2316
2317 static int link_enter_join_netdev(Link *link) {
2318         NetDev *netdev;
2319         Iterator i;
2320         int r;
2321
2322         assert(link);
2323         assert(link->network);
2324         assert(link->state == LINK_STATE_INITIALIZED);
2325
2326         link_set_state(link, LINK_STATE_CONFIGURING);
2327
2328         link_dirty(link);
2329         link->enslaving = 0;
2330
2331         if (link->network->bond) {
2332                 if (link->network->bond->state == NETDEV_STATE_READY &&
2333                     link->network->bond->ifindex == link->master_ifindex)
2334                         return link_joined(link);
2335
2336                 log_struct(LOG_DEBUG,
2337                            LOG_LINK_INTERFACE(link),
2338                            LOG_NETDEV_INTERFACE(link->network->bond),
2339                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2340
2341                 link->enslaving++;
2342
2343                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2344                 if (r < 0) {
2345                         log_struct_errno(LOG_WARNING, r,
2346                                          LOG_LINK_INTERFACE(link),
2347                                          LOG_NETDEV_INTERFACE(link->network->bond),
2348                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2349                         link_enter_failed(link);
2350                         return r;
2351                 }
2352         }
2353
2354         if (link->network->bridge) {
2355                 log_struct(LOG_DEBUG,
2356                            LOG_LINK_INTERFACE(link),
2357                            LOG_NETDEV_INTERFACE(link->network->bridge),
2358                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2359
2360                 link->enslaving++;
2361
2362                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2363                 if (r < 0) {
2364                         log_struct_errno(LOG_WARNING, r,
2365                                          LOG_LINK_INTERFACE(link),
2366                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2367                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2368                         link_enter_failed(link);
2369                         return r;
2370                 }
2371         }
2372
2373         if (link->network->vrf) {
2374                 log_struct(LOG_DEBUG,
2375                            LOG_LINK_INTERFACE(link),
2376                            LOG_NETDEV_INTERFACE(link->network->vrf),
2377                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2378
2379                 link->enslaving++;
2380
2381                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2382                 if (r < 0) {
2383                         log_struct_errno(LOG_WARNING, r,
2384                                          LOG_LINK_INTERFACE(link),
2385                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2386                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2387                         link_enter_failed(link);
2388                         return r;
2389                 }
2390         }
2391
2392         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2393
2394                 if (netdev->ifindex > 0)
2395                         /* Assume already enslaved. */
2396                         continue;
2397
2398                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2399                         continue;
2400
2401                 log_struct(LOG_DEBUG,
2402                            LOG_LINK_INTERFACE(link),
2403                            LOG_NETDEV_INTERFACE(netdev),
2404                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2405
2406                 link->enslaving++;
2407
2408                 r = netdev_join(netdev, link, netdev_join_handler);
2409                 if (r < 0) {
2410                         log_struct_errno(LOG_WARNING, r,
2411                                          LOG_LINK_INTERFACE(link),
2412                                          LOG_NETDEV_INTERFACE(netdev),
2413                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2414                         link_enter_failed(link);
2415                         return r;
2416                 }
2417         }
2418
2419         if (link->enslaving == 0)
2420                 return link_joined(link);
2421
2422         return 0;
2423 }
2424
2425 static int link_set_ipv4_forward(Link *link) {
2426         int r;
2427
2428         if (!link_ipv4_forward_enabled(link))
2429                 return 0;
2430
2431         /* We propagate the forwarding flag from one interface to the
2432          * global setting one way. This means: as long as at least one
2433          * interface was configured at any time that had IP forwarding
2434          * enabled the setting will stay on for good. We do this
2435          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2436          * somewhat in sync (see below). */
2437
2438         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2439         if (r < 0)
2440                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2441
2442         return 0;
2443 }
2444
2445 static int link_set_ipv6_forward(Link *link) {
2446         int r;
2447
2448         if (!link_ipv6_forward_enabled(link))
2449                 return 0;
2450
2451         /* On Linux, the IPv6 stack does not know a per-interface
2452          * packet forwarding setting: either packet forwarding is on
2453          * for all, or off for all. We hence don't bother with a
2454          * per-interface setting, but simply propagate the interface
2455          * flag, if it is set, to the global flag, one-way. Note that
2456          * while IPv4 would allow a per-interface flag, we expose the
2457          * same behaviour there and also propagate the setting from
2458          * one to all, to keep things simple (see above). */
2459
2460         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2461         if (r < 0)
2462                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2463
2464         return 0;
2465 }
2466
2467 static int link_set_ipv6_privacy_extensions(Link *link) {
2468         IPv6PrivacyExtensions s;
2469         int r;
2470
2471         s = link_ipv6_privacy_extensions(link);
2472         if (s < 0)
2473                 return 0;
2474
2475         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2476         if (r < 0)
2477                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2478
2479         return 0;
2480 }
2481
2482 static int link_set_ipv6_accept_ra(Link *link) {
2483         int r;
2484
2485         /* Make this a NOP if IPv6 is not available */
2486         if (!socket_ipv6_is_supported())
2487                 return 0;
2488
2489         if (link->flags & IFF_LOOPBACK)
2490                 return 0;
2491
2492         if (!link->network)
2493                 return 0;
2494
2495         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2496         if (r < 0)
2497                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2498
2499         return 0;
2500 }
2501
2502 static int link_set_ipv6_dad_transmits(Link *link) {
2503         int r;
2504
2505         /* Make this a NOP if IPv6 is not available */
2506         if (!socket_ipv6_is_supported())
2507                 return 0;
2508
2509         if (link->flags & IFF_LOOPBACK)
2510                 return 0;
2511
2512         if (!link->network)
2513                 return 0;
2514
2515         if (link->network->ipv6_dad_transmits < 0)
2516                 return 0;
2517
2518         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2519         if (r < 0)
2520                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2521
2522         return 0;
2523 }
2524
2525 static int link_set_ipv6_hop_limit(Link *link) {
2526         int r;
2527
2528         /* Make this a NOP if IPv6 is not available */
2529         if (!socket_ipv6_is_supported())
2530                 return 0;
2531
2532         if (link->flags & IFF_LOOPBACK)
2533                 return 0;
2534
2535         if (!link->network)
2536                 return 0;
2537
2538         if (link->network->ipv6_hop_limit < 0)
2539                 return 0;
2540
2541         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2542         if (r < 0)
2543                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2544
2545         return 0;
2546 }
2547
2548 static int link_set_ipv6_mtu(Link *link) {
2549         int r;
2550
2551         /* Make this a NOP if IPv6 is not available */
2552         if (!socket_ipv6_is_supported())
2553                 return 0;
2554
2555         if (link->flags & IFF_LOOPBACK)
2556                 return 0;
2557
2558         if (link->network->ipv6_mtu == 0)
2559                 return 0;
2560
2561         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2562          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2563         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2564                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2565                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2566         }
2567
2568         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2569         if (r < 0) {
2570                 if (link->mtu < link->network->ipv6_mtu)
2571                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2572                                          link->network->ipv6_mtu, link->mtu);
2573                 else
2574                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2575         }
2576
2577         link->ipv6_mtu_set = true;
2578
2579         return 0;
2580 }
2581
2582 static int link_set_ipv4_accept_local(Link *link) {
2583         int r;
2584
2585         if (link->flags & IFF_LOOPBACK)
2586                 return 0;
2587
2588         if (link->network->ipv4_accept_local < 0)
2589                 return 0;
2590
2591         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2592         if (r < 0)
2593                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2594
2595         return 0;
2596 }
2597
2598 static bool link_is_static_address_configured(Link *link, Address *address) {
2599         Address *net_address;
2600
2601         assert(link);
2602         assert(address);
2603
2604         if (!link->network)
2605                 return false;
2606
2607         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2608                 if (address_equal(net_address, address))
2609                         return true;
2610
2611         return false;
2612 }
2613
2614 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2615         Neighbor *net_neighbor;
2616
2617         assert(link);
2618         assert(neighbor);
2619
2620         if (!link->network)
2621                 return false;
2622
2623         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2624                 if (neighbor_equal(net_neighbor, neighbor))
2625                         return true;
2626
2627         return false;
2628 }
2629
2630 static bool link_is_static_route_configured(Link *link, Route *route) {
2631         Route *net_route;
2632
2633         assert(link);
2634         assert(route);
2635
2636         if (!link->network)
2637                 return false;
2638
2639         LIST_FOREACH(routes, net_route, link->network->static_routes)
2640                 if (route_equal(net_route, route))
2641                         return true;
2642
2643         return false;
2644 }
2645
2646 static bool link_address_is_dynamic(Link *link, Address *address) {
2647         Route *route;
2648         Iterator i;
2649
2650         assert(link);
2651         assert(address);
2652
2653         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2654                 return true;
2655
2656         /* Even when the address is leased from a DHCP server, networkd assign the address
2657          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2658          * corresponding routes with RTPROT_DHCP. */
2659         SET_FOREACH(route, link->routes_foreign, i) {
2660                 if (route->protocol != RTPROT_DHCP)
2661                         continue;
2662
2663                 if (address->family != route->family)
2664                         continue;
2665
2666                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2667                         return true;
2668         }
2669
2670         return false;
2671 }
2672
2673 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2674         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2675         sd_netlink_message *addr;
2676         int r;
2677
2678         assert(link);
2679         assert(link->manager);
2680         assert(link->manager->rtnl);
2681
2682         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2683         if (r < 0)
2684                 return r;
2685
2686         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2687         if (r < 0)
2688                 return r;
2689
2690         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2691                 unsigned char flags;
2692                 int ifindex;
2693
2694                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2695                 if (r < 0) {
2696                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2697                         continue;
2698                 } else if (link->ifindex != ifindex)
2699                         continue;
2700
2701                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2702                 if (r < 0) {
2703                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2704                         continue;
2705                 } else if (!(flags & IFA_F_TENTATIVE))
2706                         continue;
2707
2708                 log_link_debug(link, "Found tentative ipv6 link-local address");
2709                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2710         }
2711
2712         return 0;
2713 }
2714
2715 static int link_drop_foreign_config(Link *link) {
2716         Address *address;
2717         Neighbor *neighbor;
2718         Route *route;
2719         Iterator i;
2720         int r;
2721
2722         /* The kernel doesn't notify us about tentative addresses;
2723          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2724         if (!link_ipv6ll_enabled(link)) {
2725                 r = link_enumerate_ipv6_tentative_addresses(link);
2726                 if (r < 0)
2727                         return r;
2728         }
2729
2730         SET_FOREACH(address, link->addresses_foreign, i) {
2731                 /* we consider IPv6LL addresses to be managed by the kernel */
2732                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2733                         continue;
2734
2735                 if (link_address_is_dynamic(link, address)) {
2736                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2737                                 continue;
2738                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2739                         continue;
2740
2741                 if (link_is_static_address_configured(link, address)) {
2742                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2743                         if (r < 0)
2744                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2745                 } else {
2746                         r = address_remove(address, link, NULL);
2747                         if (r < 0)
2748                                 return r;
2749                 }
2750         }
2751
2752         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2753                 if (link_is_neighbor_configured(link, neighbor)) {
2754                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2755                         if (r < 0)
2756                                 return r;
2757                 } else {
2758                         r = neighbor_remove(neighbor, link, NULL);
2759                         if (r < 0)
2760                                 return r;
2761                 }
2762         }
2763
2764         SET_FOREACH(route, link->routes_foreign, i) {
2765                 /* do not touch routes managed by the kernel */
2766                 if (route->protocol == RTPROT_KERNEL)
2767                         continue;
2768
2769                 /* do not touch multicast route added by kernel */
2770                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2771                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2772                 if (route->protocol == RTPROT_BOOT &&
2773                     route->family == AF_INET6 &&
2774                     route->dst_prefixlen == 8 &&
2775                     in_addr_equal(AF_INET6, &route->dst, &(union in_addr_union) { .in6 = {{{ 0xff,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }}} }))
2776                         continue;
2777
2778                 if (route->protocol == RTPROT_STATIC && link->network &&
2779                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2780                         continue;
2781
2782                 if (route->protocol == RTPROT_DHCP && link->network &&
2783                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2784                         continue;
2785
2786                 if (link_is_static_route_configured(link, route)) {
2787                         r = route_add(link, route, NULL);
2788                         if (r < 0)
2789                                 return r;
2790                 } else {
2791                         r = route_remove(route, link, NULL);
2792                         if (r < 0)
2793                                 return r;
2794                 }
2795         }
2796
2797         return 0;
2798 }
2799
2800 static int link_drop_config(Link *link) {
2801         Address *address, *pool_address;
2802         Neighbor *neighbor;
2803         Route *route;
2804         Iterator i;
2805         int r;
2806
2807         SET_FOREACH(address, link->addresses, i) {
2808                 /* we consider IPv6LL addresses to be managed by the kernel */
2809                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2810                         continue;
2811
2812                 r = address_remove(address, link, NULL);
2813                 if (r < 0)
2814                         return r;
2815
2816                 /* If this address came from an address pool, clean up the pool */
2817                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2818                         if (address_equal(address, pool_address)) {
2819                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2820                                 address_free(pool_address);
2821                                 break;
2822                         }
2823                 }
2824         }
2825
2826         SET_FOREACH(neighbor, link->neighbors, i) {
2827                 r = neighbor_remove(neighbor, link, NULL);
2828                 if (r < 0)
2829                         return r;
2830         }
2831
2832         SET_FOREACH(route, link->routes, i) {
2833                 /* do not touch routes managed by the kernel */
2834                 if (route->protocol == RTPROT_KERNEL)
2835                         continue;
2836
2837                 r = route_remove(route, link, NULL);
2838                 if (r < 0)
2839                         return r;
2840         }
2841
2842         ndisc_flush(link);
2843
2844         return 0;
2845 }
2846
2847 static int link_configure_ipv4_dad(Link *link) {
2848         Address *address;
2849         int r;
2850
2851         assert(link);
2852         assert(link->network);
2853
2854         LIST_FOREACH(addresses, address, link->network->static_addresses)
2855                 if (address->family == AF_INET &&
2856                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2857                         r = configure_ipv4_duplicate_address_detection(link, address);
2858                         if (r < 0)
2859                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2860                 }
2861
2862         return 0;
2863 }
2864
2865 static int link_configure_traffic_control(Link *link) {
2866         TrafficControl *tc;
2867         Iterator i;
2868         int r;
2869
2870         link->tc_configured = false;
2871         link->tc_messages = 0;
2872
2873         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2874                 r = traffic_control_configure(link, tc);
2875                 if (r < 0)
2876                         return r;
2877         }
2878
2879         if (link->tc_messages == 0)
2880                 link->tc_configured = true;
2881         else
2882                 log_link_debug(link, "Configuring traffic control");
2883
2884         return 0;
2885 }
2886
2887 static int link_configure_sr_iov(Link *link) {
2888         SRIOV *sr_iov;
2889         Iterator i;
2890         int r;
2891
2892         link->sr_iov_configured = false;
2893         link->sr_iov_messages = 0;
2894
2895         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2896                 r = sr_iov_configure(link, sr_iov);
2897                 if (r < 0)
2898                         return r;
2899         }
2900
2901         if (link->sr_iov_messages == 0)
2902                 link->sr_iov_configured = true;
2903         else
2904                 log_link_debug(link, "Configuring SR-IOV");
2905
2906         return 0;
2907 }
2908
2909 static int link_configure(Link *link) {
2910         int r;
2911
2912         assert(link);
2913         assert(link->network);
2914         assert(link->state == LINK_STATE_INITIALIZED);
2915
2916         r = link_configure_traffic_control(link);
2917         if (r < 0)
2918                 return r;
2919
2920         r = link_configure_sr_iov(link);
2921         if (r < 0)
2922                 return r;
2923
2924         if (link->iftype == ARPHRD_CAN)
2925                 return link_configure_can(link);
2926
2927         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2928          * for this interface, then enable IPv6 */
2929         (void) link_update_ipv6_sysctl(link);
2930
2931         r = link_set_proxy_arp(link);
2932         if (r < 0)
2933                return r;
2934
2935         r = ipv6_proxy_ndp_addresses_configure(link);
2936         if (r < 0)
2937                 return r;
2938
2939         r = link_set_ipv4_forward(link);
2940         if (r < 0)
2941                 return r;
2942
2943         r = link_set_ipv6_forward(link);
2944         if (r < 0)
2945                 return r;
2946
2947         r = link_set_ipv6_privacy_extensions(link);
2948         if (r < 0)
2949                 return r;
2950
2951         r = link_set_ipv6_accept_ra(link);
2952         if (r < 0)
2953                 return r;
2954
2955         r = link_set_ipv6_dad_transmits(link);
2956         if (r < 0)
2957                 return r;
2958
2959         r = link_set_ipv6_hop_limit(link);
2960         if (r < 0)
2961                 return r;
2962
2963         r = link_set_ipv4_accept_local(link);
2964         if (r < 0)
2965                 return r;
2966
2967         r = link_set_flags(link);
2968         if (r < 0)
2969                 return r;
2970
2971         r = link_set_group(link);
2972         if (r < 0)
2973                 return r;
2974
2975         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2976                 r = ipv4ll_configure(link);
2977                 if (r < 0)
2978                         return r;
2979         }
2980
2981         if (link_dhcp4_enabled(link)) {
2982                 r = dhcp4_set_promote_secondaries(link);
2983                 if (r < 0)
2984                         return r;
2985
2986                 r = dhcp4_configure(link);
2987                 if (r < 0)
2988                         return r;
2989         }
2990
2991         if (link_dhcp4_server_enabled(link)) {
2992                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2993                 if (r < 0)
2994                         return r;
2995
2996                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2997                 if (r < 0)
2998                         return r;
2999         }
3000
3001         if (link_dhcp6_enabled(link) ||
3002             link_ipv6_accept_ra_enabled(link)) {
3003                 r = dhcp6_configure(link);
3004                 if (r < 0)
3005                         return r;
3006         }
3007
3008         if (link_ipv6_accept_ra_enabled(link)) {
3009                 r = ndisc_configure(link);
3010                 if (r < 0)
3011                         return r;
3012         }
3013
3014         if (link_radv_enabled(link)) {
3015                 r = radv_configure(link);
3016                 if (r < 0)
3017                         return r;
3018         }
3019
3020         if (link_lldp_rx_enabled(link)) {
3021                 r = link_lldp_rx_configure(link);
3022                 if (r < 0)
3023                         return r;
3024         }
3025
3026         r = link_configure_mtu(link);
3027         if (r < 0)
3028                 return r;
3029
3030         r = link_configure_addrgen_mode(link);
3031         if (r < 0)
3032                 return r;
3033
3034         r = link_configure_ipv4_dad(link);
3035         if (r < 0)
3036                 return r;
3037
3038         return link_configure_continue(link);
3039 }
3040
3041 /* The configuration continues in this separate function, instead of
3042  * including this in the above link_configure() function, for two
3043  * reasons:
3044  * 1) some devices reset the link when the mtu is set, which caused
3045  *    an infinite loop here in networkd; see:
3046  *    https://github.com/systemd/systemd/issues/6593
3047  *    https://github.com/systemd/systemd/issues/9831
3048  * 2) if ipv6ll is disabled, then bringing the interface up must be
3049  *    delayed until after we get confirmation from the kernel that
3050  *    the addr_gen_mode parameter has been set (via netlink), see:
3051  *    https://github.com/systemd/systemd/issues/13882
3052  */
3053 static int link_configure_continue(Link *link) {
3054         int r;
3055
3056         assert(link);
3057         assert(link->network);
3058         assert(link->state == LINK_STATE_INITIALIZED);
3059
3060         if (link->setting_mtu || link->setting_genmode)
3061                 return 0;
3062
3063         /* Drop foreign config, but ignore loopback or critical devices.
3064          * We do not want to remove loopback address or addresses used for root NFS. */
3065         if (!(link->flags & IFF_LOOPBACK) &&
3066             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3067                 r = link_drop_foreign_config(link);
3068                 if (r < 0)
3069                         return r;
3070         }
3071
3072         /* The kernel resets ipv6 mtu after changing device mtu;
3073          * we must set this here, after we've set device mtu */
3074         r = link_set_ipv6_mtu(link);
3075         if (r < 0)
3076                 return r;
3077
3078         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3079                 r = link_acquire_conf(link);
3080                 if (r < 0)
3081                         return r;
3082         }
3083
3084         return link_enter_join_netdev(link);
3085 }
3086
3087 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3088         assert(duid);
3089
3090         if (duid->raw_data_len > 0)
3091                 return 0;
3092
3093         if (duid->type != DUID_TYPE_UUID)
3094                 return -EINVAL;
3095
3096         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3097         duid->raw_data_len = sizeof(sd_id128_t);
3098
3099         return 1;
3100 }
3101
3102 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3103         Manager *manager = userdata;
3104         const sd_bus_error *e;
3105         const void *a;
3106         size_t sz;
3107         DUID *duid;
3108         Link *link;
3109         int r;
3110
3111         assert(m);
3112         assert(manager);
3113
3114         e = sd_bus_message_get_error(m);
3115         if (e) {
3116                 log_error_errno(sd_bus_error_get_errno(e),
3117                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3118                                 e->message);
3119                 goto configure;
3120         }
3121
3122         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3123         if (r < 0)
3124                 goto configure;
3125
3126         if (sz != sizeof(sd_id128_t)) {
3127                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3128                 goto configure;
3129         }
3130
3131         memcpy(&manager->product_uuid, a, sz);
3132         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3133                 (void) duid_set_uuid(duid, manager->product_uuid);
3134
3135         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3136
3137 configure:
3138         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3139                 link_unref(link);
3140
3141                 r = link_configure(link);
3142                 if (r < 0)
3143                         link_enter_failed(link);
3144         }
3145
3146         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3147
3148         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3149          * even if the method fails. */
3150         manager->has_product_uuid = true;
3151
3152         return 1;
3153 }
3154
3155 static bool link_requires_uuid(Link *link) {
3156         const DUID *duid;
3157
3158         assert(link);
3159         assert(link->manager);
3160         assert(link->network);
3161
3162         duid = link_get_duid(link);
3163         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3164                 return false;
3165
3166         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3167                 return true;
3168
3169         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3170                 return true;
3171
3172         return false;
3173 }
3174
3175 static int link_configure_duid(Link *link) {
3176         Manager *m;
3177         DUID *duid;
3178         int r;
3179
3180         assert(link);
3181         assert(link->manager);
3182         assert(link->network);
3183
3184         m = link->manager;
3185         duid = link_get_duid(link);
3186
3187         if (!link_requires_uuid(link))
3188                 return 1;
3189
3190         if (m->has_product_uuid) {
3191                 (void) duid_set_uuid(duid, m->product_uuid);
3192                 return 1;
3193         }
3194
3195         if (!m->links_requesting_uuid) {
3196                 r = manager_request_product_uuid(m, link);
3197                 if (r < 0) {
3198                         if (r == -ENOMEM)
3199                                 return r;
3200
3201                         log_link_warning_errno(link, r,
3202                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3203                         return 1;
3204                 }
3205         } else {
3206                 r = set_put(m->links_requesting_uuid, link);
3207                 if (r < 0)
3208                         return log_oom();
3209                 if (r > 0)
3210                         link_ref(link);
3211
3212                 r = set_put(m->duids_requesting_uuid, duid);
3213                 if (r < 0)
3214                         return log_oom();
3215         }
3216
3217         return 0;
3218 }
3219
3220 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3221         Network *network;
3222         int r;
3223
3224         if (m) {
3225                 _cleanup_strv_free_ char **s = NULL;
3226
3227                 r = sd_netlink_message_get_errno(m);
3228                 if (r < 0)
3229                         return r;
3230
3231                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3232                 if (r < 0 && r != -ENODATA)
3233                         return r;
3234
3235                 strv_free_and_replace(link->alternative_names, s);
3236         }
3237
3238         r = network_get(link->manager, link->iftype, link->sd_device,
3239                         link->ifname, link->alternative_names, link->driver,
3240                         &link->mac, &link->permanent_mac,
3241                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3242         if (r == -ENOENT) {
3243                 link_enter_unmanaged(link);
3244                 return 0;
3245         } else if (r == 0 && network->unmanaged) {
3246                 link_enter_unmanaged(link);
3247                 return 0;
3248         } else if (r < 0)
3249                 return r;
3250
3251         if (link->network == network && !force)
3252                 return 0;
3253
3254         log_link_info(link, "Re-configuring with %s", network->filename);
3255
3256         /* Dropping old .network file */
3257         r = link_stop_clients(link, false);
3258         if (r < 0)
3259                 return r;
3260
3261         if (link_dhcp4_server_enabled(link))
3262                 (void) sd_dhcp_server_stop(link->dhcp_server);
3263
3264         r = link_drop_config(link);
3265         if (r < 0)
3266                 return r;
3267
3268         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3269                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3270                 r = link_drop_foreign_config(link);
3271                 if (r < 0)
3272                         return r;
3273         }
3274
3275         link_free_carrier_maps(link);
3276         link_free_engines(link);
3277         link->network = network_unref(link->network);
3278
3279         /* Then, apply new .network file */
3280         r = network_apply(network, link);
3281         if (r < 0)
3282                 return r;
3283
3284         r = link_new_carrier_maps(link);
3285         if (r < 0)
3286                 return r;
3287
3288         link_set_state(link, LINK_STATE_INITIALIZED);
3289         link_dirty(link);
3290
3291         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3292          * link_configure() is called later asynchronously. */
3293         r = link_configure_duid(link);
3294         if (r <= 0)
3295                 return r;
3296
3297         r = link_configure(link);
3298         if (r < 0)
3299                 return r;
3300
3301         return 0;
3302 }
3303
3304 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3305         int r;
3306
3307         r = link_reconfigure_internal(link, m, false);
3308         if (r < 0)
3309                 link_enter_failed(link);
3310
3311         return 1;
3312 }
3313
3314 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3315         int r;
3316
3317         r = link_reconfigure_internal(link, m, true);
3318         if (r < 0)
3319                 link_enter_failed(link);
3320
3321         return 1;
3322 }
3323
3324 int link_reconfigure(Link *link, bool force) {
3325         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3326         int r;
3327
3328         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3329                 return 0;
3330
3331         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3332                                      link->ifindex);
3333         if (r < 0)
3334                 return r;
3335
3336         r = netlink_call_async(link->manager->rtnl, NULL, req,
3337                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3338                                link_netlink_destroy_callback, link);
3339         if (r < 0)
3340                 return r;
3341
3342         link_ref(link);
3343
3344         return 0;
3345 }
3346
3347 static int link_initialized_and_synced(Link *link) {
3348         Network *network;
3349         int r;
3350
3351         assert(link);
3352         assert(link->ifname);
3353         assert(link->manager);
3354
3355         /* We may get called either from the asynchronous netlink callback,
3356          * or directly for link_add() if running in a container. See link_add(). */
3357         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3358                 return 0;
3359
3360         log_link_debug(link, "Link state is up-to-date");
3361         link_set_state(link, LINK_STATE_INITIALIZED);
3362
3363         r = link_new_bound_by_list(link);
3364         if (r < 0)
3365                 return r;
3366
3367         r = link_handle_bound_by_list(link);
3368         if (r < 0)
3369                 return r;
3370
3371         if (!link->network) {
3372                 r = wifi_get_info(link);
3373                 if (r < 0)
3374                         return r;
3375
3376                 r = network_get(link->manager, link->iftype, link->sd_device,
3377                                 link->ifname, link->alternative_names, link->driver,
3378                                 &link->mac, &link->permanent_mac,
3379                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3380                 if (r == -ENOENT) {
3381                         link_enter_unmanaged(link);
3382                         return 0;
3383                 } else if (r == 0 && network->unmanaged) {
3384                         link_enter_unmanaged(link);
3385                         return 0;
3386                 } else if (r < 0)
3387                         return r;
3388
3389                 if (link->flags & IFF_LOOPBACK) {
3390                         if (network->link_local != ADDRESS_FAMILY_NO)
3391                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3392
3393                         if (network->dhcp != ADDRESS_FAMILY_NO)
3394                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3395
3396                         if (network->dhcp_server)
3397                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3398                 }
3399
3400                 r = network_apply(network, link);
3401                 if (r < 0)
3402                         return r;
3403         }
3404
3405         r = link_new_bound_to_list(link);
3406         if (r < 0)
3407                 return r;
3408
3409         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3410          * link_configure() is called later asynchronously. */
3411         r = link_configure_duid(link);
3412         if (r <= 0)
3413                 return r;
3414
3415         r = link_configure(link);
3416         if (r < 0)
3417                 return r;
3418
3419         return 0;
3420 }
3421
3422 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3423         _cleanup_strv_free_ char **s = NULL;
3424         int r;
3425
3426         r = sd_netlink_message_get_errno(m);
3427         if (r < 0) {
3428                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3429                 link_enter_failed(link);
3430                 return 0;
3431         }
3432
3433         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3434         if (r < 0 && r != -ENODATA) {
3435                 link_enter_failed(link);
3436                 return 0;
3437         }
3438
3439         strv_free_and_replace(link->alternative_names, s);
3440
3441         r = link_initialized_and_synced(link);
3442         if (r < 0)
3443                 link_enter_failed(link);
3444         return 1;
3445 }
3446
3447 int link_initialized(Link *link, sd_device *device) {
3448         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3449         int r;
3450
3451         assert(link);
3452         assert(link->manager);
3453         assert(link->manager->rtnl);
3454         assert(device);
3455
3456         if (link->state != LINK_STATE_PENDING)
3457                 return 0;
3458
3459         if (link->sd_device)
3460                 return 0;
3461
3462         log_link_debug(link, "udev initialized link");
3463         link_set_state(link, LINK_STATE_INITIALIZED);
3464
3465         link->sd_device = sd_device_ref(device);
3466
3467         /* udev has initialized the link, but we don't know if we have yet
3468          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3469          * when it returns we know that the pending NEWLINKs have already been
3470          * processed and that we are up-to-date */
3471
3472         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3473                                      link->ifindex);
3474         if (r < 0)
3475                 return r;
3476
3477         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3478                                link_netlink_destroy_callback, link);
3479         if (r < 0)
3480                 return r;
3481
3482         link_ref(link);
3483
3484         return 0;
3485 }
3486
3487 static int link_load(Link *link) {
3488         _cleanup_free_ char *network_file = NULL,
3489                             *addresses = NULL,
3490                             *routes = NULL,
3491                             *dhcp4_address = NULL,
3492                             *ipv4ll_address = NULL;
3493         union in_addr_union address;
3494         int r;
3495
3496         assert(link);
3497
3498         r = parse_env_file(NULL, link->state_file,
3499                            "NETWORK_FILE", &network_file,
3500                            "ADDRESSES", &addresses,
3501                            "ROUTES", &routes,
3502                            "DHCP4_ADDRESS", &dhcp4_address,
3503                            "IPV4LL_ADDRESS", &ipv4ll_address);
3504         if (r < 0 && r != -ENOENT)
3505                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3506
3507         if (network_file) {
3508                 Network *network;
3509                 char *suffix;
3510
3511                 /* drop suffix */
3512                 suffix = strrchr(network_file, '.');
3513                 if (!suffix) {
3514                         log_link_debug(link, "Failed to get network name from %s", network_file);
3515                         goto network_file_fail;
3516                 }
3517                 *suffix = '\0';
3518
3519                 r = network_get_by_name(link->manager, basename(network_file), &network);
3520                 if (r < 0) {
3521                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3522                         goto network_file_fail;
3523                 }
3524
3525                 r = network_apply(network, link);
3526                 if (r < 0)
3527                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3528         }
3529
3530 network_file_fail:
3531
3532         for (const char *p = addresses; p; ) {
3533                 _cleanup_free_ char *address_str = NULL;
3534                 char *prefixlen_str;
3535                 int family;
3536                 unsigned char prefixlen;
3537
3538                 r = extract_first_word(&p, &address_str, NULL, 0);
3539                 if (r < 0)
3540                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3541                 if (r <= 0)
3542                         break;
3543
3544                 prefixlen_str = strchr(address_str, '/');
3545                 if (!prefixlen_str) {
3546                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3547                         continue;
3548                 }
3549                 *prefixlen_str++ = '\0';
3550
3551                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3552                 if (r != 1) {
3553                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3554                         continue;
3555                 }
3556
3557                 r = in_addr_from_string_auto(address_str, &family, &address);
3558                 if (r < 0) {
3559                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3560                         continue;
3561                 }
3562
3563                 r = address_add(link, family, &address, prefixlen, NULL);
3564                 if (r < 0)
3565                         return log_link_error_errno(link, r, "Failed to add address: %m");
3566         }
3567
3568         for (const char *p = routes; p; ) {
3569                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3570                 _cleanup_(route_freep) Route *tmp = NULL;
3571                 _cleanup_free_ char *route_str = NULL;
3572                 char *prefixlen_str;
3573                 Route *route;
3574
3575                 r = extract_first_word(&p, &route_str, NULL, 0);
3576                 if (r < 0)
3577                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3578                 if (r <= 0)
3579                         break;
3580
3581                 prefixlen_str = strchr(route_str, '/');
3582                 if (!prefixlen_str) {
3583                         log_link_debug(link, "Failed to parse route %s", route_str);
3584                         continue;
3585                 }
3586                 *prefixlen_str++ = '\0';
3587
3588                 r = route_new(&tmp);
3589                 if (r < 0)
3590                         return log_oom();
3591
3592                 r = sscanf(prefixlen_str,
3593                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3594                            &tmp->dst_prefixlen,
3595                            &tmp->tos,
3596                            &tmp->priority,
3597                            &tmp->table,
3598                            &tmp->lifetime);
3599                 if (r != 5) {
3600                         log_link_debug(link,
3601                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3602                                        prefixlen_str);
3603                         continue;
3604                 }
3605
3606                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3607                 if (r < 0) {
3608                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3609                         continue;
3610                 }
3611
3612                 r = route_add(link, tmp, &route);
3613                 if (r < 0)
3614                         return log_link_error_errno(link, r, "Failed to add route: %m");
3615
3616                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3617                         r = sd_event_add_time(link->manager->event, &expire,
3618                                               clock_boottime_or_monotonic(),
3619                                               route->lifetime, 0, route_expire_handler, route);
3620                         if (r < 0)
3621                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3622                 }
3623
3624                 sd_event_source_unref(route->expire);
3625                 route->expire = TAKE_PTR(expire);
3626         }
3627
3628         if (dhcp4_address) {
3629                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3630                 if (r < 0) {
3631                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3632                         goto dhcp4_address_fail;
3633                 }
3634
3635                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3636                 if (r < 0)
3637                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3638
3639                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3640                 if (r < 0)
3641                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3642
3643                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3644                 if (r < 0)
3645                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3646         }
3647
3648 dhcp4_address_fail:
3649
3650         if (ipv4ll_address) {
3651                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3652                 if (r < 0) {
3653                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3654                         goto ipv4ll_address_fail;
3655                 }
3656
3657                 r = sd_ipv4ll_new(&link->ipv4ll);
3658                 if (r < 0)
3659                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3660
3661                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3662                 if (r < 0)
3663                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3664
3665                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3666                 if (r < 0)
3667                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3668         }
3669
3670 ipv4ll_address_fail:
3671
3672         return 0;
3673 }
3674
3675 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3676         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3677         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3678         Link *link;
3679         int r;
3680
3681         assert(m);
3682         assert(m->rtnl);
3683         assert(message);
3684         assert(ret);
3685
3686         r = link_new(m, message, ret);
3687         if (r < 0)
3688                 return r;
3689
3690         link = *ret;
3691
3692         log_link_debug(link, "Link %d added", link->ifindex);
3693
3694         r = link_load(link);
3695         if (r < 0)
3696                 return r;
3697
3698         if (path_is_read_only_fs("/sys") <= 0) {
3699                 /* udev should be around */
3700                 sprintf(ifindex_str, "n%d", link->ifindex);
3701                 r = sd_device_new_from_device_id(&device, ifindex_str);
3702                 if (r < 0) {
3703                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3704                         return 0;
3705                 }
3706
3707                 r = sd_device_get_is_initialized(device);
3708                 if (r < 0) {
3709                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3710                         goto failed;
3711                 }
3712                 if (r == 0) {
3713                         /* not yet ready */
3714                         log_link_debug(link, "link pending udev initialization...");
3715                         return 0;
3716                 }
3717
3718                 r = device_is_renaming(device);
3719                 if (r < 0) {
3720                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3721                         goto failed;
3722                 }
3723                 if (r > 0) {
3724                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3725                         return 0;
3726                 }
3727
3728                 r = link_initialized(link, device);
3729                 if (r < 0)
3730                         goto failed;
3731         } else {
3732                 r = link_initialized_and_synced(link);
3733                 if (r < 0)
3734                         goto failed;
3735         }
3736
3737         return 0;
3738 failed:
3739         link_enter_failed(link);
3740         return r;
3741 }
3742
3743 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3744         int r;
3745
3746         assert(link);
3747
3748         log_link_info(link, "Gained IPv6LL");
3749
3750         link->ipv6ll_address = *address;
3751         link_check_ready(link);
3752
3753         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3754                 r = link_acquire_ipv6_conf(link);
3755                 if (r < 0) {
3756                         link_enter_failed(link);
3757                         return r;
3758                 }
3759         }
3760
3761         return 0;
3762 }
3763
3764 static int link_carrier_gained(Link *link) {
3765         int r;
3766
3767         assert(link);
3768
3769         r = wifi_get_info(link);
3770         if (r < 0)
3771                 return r;
3772         if (r > 0) {
3773                 r = link_reconfigure_internal(link, NULL, false);
3774                 if (r < 0) {
3775                         link_enter_failed(link);
3776                         return r;
3777                 }
3778         }
3779
3780         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3781                 r = link_acquire_conf(link);
3782                 if (r < 0) {
3783                         link_enter_failed(link);
3784                         return r;
3785                 }
3786
3787                 link_set_state(link, LINK_STATE_CONFIGURING);
3788                 r = link_request_set_addresses(link);
3789                 if (r < 0)
3790                         return r;
3791         }
3792
3793         r = link_handle_bound_by_list(link);
3794         if (r < 0)
3795                 return r;
3796
3797         return 0;
3798 }
3799
3800 static int link_carrier_lost(Link *link) {
3801         int r;
3802
3803         assert(link);
3804
3805         if (link->network && link->network->ignore_carrier_loss)
3806                 return 0;
3807
3808         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3809          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3810          * configuration and stop the clients as well. */
3811         if (link->setting_mtu)
3812                 return 0;
3813
3814         r = link_stop_clients(link, false);
3815         if (r < 0) {
3816                 link_enter_failed(link);
3817                 return r;
3818         }
3819
3820         if (link_dhcp4_server_enabled(link))
3821                 (void) sd_dhcp_server_stop(link->dhcp_server);
3822
3823         r = link_drop_config(link);
3824         if (r < 0)
3825                 return r;
3826
3827         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3828                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3829                 r = link_drop_foreign_config(link);
3830                 if (r < 0)
3831                         return r;
3832         }
3833
3834         r = link_handle_bound_by_list(link);
3835         if (r < 0)
3836                 return r;
3837
3838         return 0;
3839 }
3840
3841 int link_carrier_reset(Link *link) {
3842         int r;
3843
3844         assert(link);
3845
3846         if (link_has_carrier(link)) {
3847                 r = link_carrier_lost(link);
3848                 if (r < 0)
3849                         return r;
3850
3851                 r = link_carrier_gained(link);
3852                 if (r < 0)
3853                         return r;
3854
3855                 log_link_info(link, "Reset carrier");
3856         }
3857
3858         return 0;
3859 }
3860
3861 /* This is called every time an interface admin state changes to up;
3862  * specifically, when IFF_UP flag changes from unset to set */
3863 static int link_admin_state_up(Link *link) {
3864         int r;
3865
3866         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3867          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3868          * ipv6_mtu_set prevents this from trying to set it too early before
3869          * the link->network has been setup; we only need to reset it
3870          * here if we've already set it during normal initialization. */
3871         if (link->ipv6_mtu_set) {
3872                 r = link_set_ipv6_mtu(link);
3873                 if (r < 0)
3874                         return r;
3875         }
3876
3877         return 0;
3878 }
3879
3880 int link_update(Link *link, sd_netlink_message *m) {
3881         _cleanup_strv_free_ char **s = NULL;
3882         struct ether_addr mac;
3883         const char *ifname;
3884         uint32_t mtu;
3885         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3886         int old_master, r;
3887
3888         assert(link);
3889         assert(link->ifname);
3890         assert(m);
3891
3892         if (link->state == LINK_STATE_LINGER) {
3893                 log_link_info(link, "Link re-added");
3894                 link_set_state(link, LINK_STATE_CONFIGURING);
3895
3896                 r = link_new_carrier_maps(link);
3897                 if (r < 0)
3898                         return r;
3899         }
3900
3901         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3902         if (r >= 0 && !streq(ifname, link->ifname)) {
3903                 Manager *manager = link->manager;
3904
3905                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3906
3907                 link_drop(link);
3908                 r = link_add(manager, m, &link);
3909                 if (r < 0)
3910                         return r;
3911         }
3912
3913         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3914         if (r >= 0)
3915                 strv_free_and_replace(link->alternative_names, s);
3916
3917         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3918         if (r >= 0 && mtu > 0) {
3919                 link->mtu = mtu;
3920                 if (link->original_mtu == 0) {
3921                         link->original_mtu = mtu;
3922                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3923                 }
3924
3925                 if (link->dhcp_client) {
3926                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3927                                                    link->mtu);
3928                         if (r < 0)
3929                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3930                 }
3931
3932                 if (link->radv) {
3933                         r = sd_radv_set_mtu(link->radv, link->mtu);
3934                         if (r < 0)
3935                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3936                 }
3937         }
3938
3939         /* The kernel may broadcast NEWLINK messages without the MAC address
3940            set, simply ignore them. */
3941         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3942         if (r >= 0) {
3943                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3944                            ETH_ALEN)) {
3945
3946                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3947                                ETH_ALEN);
3948
3949                         log_link_debug(link, "MAC address: "
3950                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3951                                        mac.ether_addr_octet[0],
3952                                        mac.ether_addr_octet[1],
3953                                        mac.ether_addr_octet[2],
3954                                        mac.ether_addr_octet[3],
3955                                        mac.ether_addr_octet[4],
3956                                        mac.ether_addr_octet[5]);
3957
3958                         if (link->ipv4ll) {
3959                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3960                                 if (r < 0)
3961                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3962                         }
3963
3964                         if (link->dhcp_client) {
3965                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3966                                                            (const uint8_t *) &link->mac,
3967                                                            sizeof (link->mac),
3968                                                            ARPHRD_ETHER);
3969                                 if (r < 0)
3970                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3971
3972                                 r = dhcp4_set_client_identifier(link);
3973                                 if (r < 0)
3974                                         return r;
3975                         }
3976
3977                         if (link->dhcp6_client) {
3978                                 const DUID* duid = link_get_duid(link);
3979
3980                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3981                                                             (const uint8_t *) &link->mac,
3982                                                             sizeof (link->mac),
3983                                                             ARPHRD_ETHER);
3984                                 if (r < 0)
3985                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3986
3987                                 if (link->network->iaid_set) {
3988                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3989                                                                      link->network->iaid);
3990                                         if (r < 0)
3991                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3992                                 }
3993
3994                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3995                                                              duid->type,
3996                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3997                                                              duid->raw_data_len);
3998                                 if (r < 0)
3999                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4000                         }
4001
4002                         if (link->radv) {
4003                                 r = sd_radv_set_mac(link->radv, &link->mac);
4004                                 if (r < 0)
4005                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4006                         }
4007
4008                         if (link->ndisc) {
4009                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4010                                 if (r < 0)
4011                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
4012                         }
4013                 }
4014         }
4015
4016         old_master = link->master_ifindex;
4017         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4018
4019         link_was_admin_up = link->flags & IFF_UP;
4020         had_carrier = link_has_carrier(link);
4021
4022         r = link_update_flags(link, m, old_master != link->master_ifindex);
4023         if (r < 0)
4024                 return r;
4025
4026         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4027                 log_link_info(link, "Link UP");
4028
4029                 r = link_admin_state_up(link);
4030                 if (r < 0)
4031                         return r;
4032         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4033                 log_link_info(link, "Link DOWN");
4034
4035         r = link_update_lldp(link);
4036         if (r < 0)
4037                 return r;
4038
4039         carrier_gained = !had_carrier && link_has_carrier(link);
4040         carrier_lost = had_carrier && !link_has_carrier(link);
4041
4042         if (carrier_gained) {
4043                 log_link_info(link, "Gained carrier");
4044
4045                 r = link_carrier_gained(link);
4046                 if (r < 0)
4047                         return r;
4048         } else if (carrier_lost) {
4049                 log_link_info(link, "Lost carrier");
4050
4051                 r = link_carrier_lost(link);
4052                 if (r < 0)
4053                         return r;
4054         }
4055
4056         return 0;
4057 }
4058
4059 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4060         bool space = false;
4061         Iterator i;
4062         Link *link;
4063
4064         assert(f);
4065         assert(prefix);
4066
4067         if (hashmap_isempty(h))
4068                 return;
4069
4070         fputs(prefix, f);
4071         HASHMAP_FOREACH(link, h, i) {
4072                 if (space)
4073                         fputc(' ', f);
4074
4075                 fprintf(f, "%i", link->ifindex);
4076                 space = true;
4077         }
4078
4079         fputc('\n', f);
4080 }
4081
4082 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4083         for (unsigned j = 0; j < n_dns; j++) {
4084                 _cleanup_free_ char *b = NULL;
4085                 int r;
4086
4087                 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4088                 if (r < 0) {
4089                         log_debug_errno(r, "Failed to format address, ignoring: %m");
4090                         continue;
4091                 }
4092
4093                 if (*space)
4094                         fputc(' ', f);
4095                 fputs(b, f);
4096                 *space = true;
4097         }
4098 }
4099
4100 static void serialize_addresses(
4101                 FILE *f,
4102                 const char *lvalue,
4103                 bool *space,
4104                 char **addresses,
4105                 sd_dhcp_lease *lease,
4106                 bool conditional,
4107                 sd_dhcp_lease_server_type what,
4108                 sd_dhcp6_lease *lease6,
4109                 bool conditional6,
4110                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4111                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4112         int r;
4113
4114         bool _space = false;
4115         if (!space)
4116                 space = &_space;
4117
4118         if (lvalue)
4119                 fprintf(f, "%s=", lvalue);
4120         fputstrv(f, addresses, NULL, space);
4121
4122         if (lease && conditional) {
4123                 const struct in_addr *lease_addresses;
4124
4125                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4126                 if (r > 0)
4127                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4128         }
4129
4130         if (lease6 && conditional6 && lease6_get_addr) {
4131                 const struct in6_addr *in6_addrs;
4132
4133                 r = lease6_get_addr(lease6, &in6_addrs);
4134                 if (r > 0)
4135                         serialize_in6_addrs(f, in6_addrs, r, space);
4136         }
4137
4138         if (lease6 && conditional6 && lease6_get_fqdn) {
4139                 char **in6_hosts;
4140
4141                 r = lease6_get_fqdn(lease6, &in6_hosts);
4142                 if (r > 0)
4143                         fputstrv(f, in6_hosts, NULL, space);
4144         }
4145
4146         if (lvalue)
4147                 fputc('\n', f);
4148 }
4149
4150 int link_save(Link *link) {
4151         const char *admin_state, *oper_state, *carrier_state, *address_state;
4152         _cleanup_free_ char *temp_path = NULL;
4153         _cleanup_fclose_ FILE *f = NULL;
4154         Route *route;
4155         Address *a;
4156         Iterator i;
4157         int r;
4158
4159         assert(link);
4160         assert(link->state_file);
4161         assert(link->lease_file);
4162         assert(link->manager);
4163
4164         if (link->state == LINK_STATE_LINGER) {
4165                 (void) unlink(link->state_file);
4166                 return 0;
4167         }
4168
4169         link_lldp_save(link);
4170
4171         admin_state = link_state_to_string(link->state);
4172         assert(admin_state);
4173
4174         oper_state = link_operstate_to_string(link->operstate);
4175         assert(oper_state);
4176
4177         carrier_state = link_carrier_state_to_string(link->carrier_state);
4178         assert(carrier_state);
4179
4180         address_state = link_address_state_to_string(link->address_state);
4181         assert(address_state);
4182
4183         r = fopen_temporary(link->state_file, &f, &temp_path);
4184         if (r < 0)
4185                 goto fail;
4186
4187         (void) fchmod(fileno(f), 0644);
4188
4189         fprintf(f,
4190                 "# This is private data. Do not parse.\n"
4191                 "ADMIN_STATE=%s\n"
4192                 "OPER_STATE=%s\n"
4193                 "CARRIER_STATE=%s\n"
4194                 "ADDRESS_STATE=%s\n",
4195                 admin_state, oper_state, carrier_state, address_state);
4196
4197         if (link->network) {
4198                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4199                 const char *dhcp_domainname = NULL, *p;
4200                 sd_dhcp6_lease *dhcp6_lease = NULL;
4201                 bool space;
4202
4203                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4204                         yes_no(link->network->required_for_online));
4205
4206                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4207                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4208                         strempty(link_operstate_to_string(st.min)),
4209                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4210                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4211
4212                 if (link->dhcp6_client) {
4213                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4214                         if (r < 0 && r != -ENOMSG)
4215                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4216                 }
4217
4218                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4219
4220                 /************************************************************/
4221
4222                 fputs("DNS=", f);
4223                 space = false;
4224                 if (link->n_dns != (unsigned) -1)
4225                         link_save_dns(f, link->dns, link->n_dns, &space);
4226                 else
4227                         link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4228
4229                 serialize_addresses(f, NULL, &space,
4230                                     NULL,
4231                                     link->dhcp_lease,
4232                                     link->network->dhcp_use_dns,
4233                                     SD_DHCP_LEASE_DNS,
4234                                     dhcp6_lease,
4235                                     link->network->dhcp6_use_dns,
4236                                     sd_dhcp6_lease_get_dns,
4237                                     NULL);
4238
4239                 /* Make sure to flush out old entries before we use the NDISC data */
4240                 ndisc_vacuum(link);
4241
4242                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4243                         NDiscRDNSS *dd;
4244
4245                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4246                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4247                 }
4248
4249                 fputc('\n', f);
4250
4251                 /************************************************************/
4252
4253                 serialize_addresses(f, "NTP", NULL,
4254                                     link->ntp ?: link->network->ntp,
4255                                     link->dhcp_lease,
4256                                     link->network->dhcp_use_ntp,
4257                                     SD_DHCP_LEASE_NTP,
4258                                     dhcp6_lease,
4259                                     link->network->dhcp6_use_ntp,
4260                                     sd_dhcp6_lease_get_ntp_addrs,
4261                                     sd_dhcp6_lease_get_ntp_fqdn);
4262
4263                 serialize_addresses(f, "SIP", NULL,
4264                                     NULL,
4265                                     link->dhcp_lease,
4266                                     link->network->dhcp_use_sip,
4267                                     SD_DHCP_LEASE_SIP,
4268                                     NULL, false, NULL, NULL);
4269
4270                 /************************************************************/
4271
4272                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4273                         if (link->dhcp_lease) {
4274                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4275                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4276                         }
4277                         if (dhcp6_lease)
4278                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4279                 }
4280
4281                 fputs("DOMAINS=", f);
4282                 space = false;
4283                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4284                         fputs_with_space(f, p, NULL, &space);
4285
4286                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4287                         if (dhcp_domainname)
4288                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4289                         if (dhcp_domains)
4290                                 fputstrv(f, dhcp_domains, NULL, &space);
4291                         if (dhcp6_domains)
4292                                 fputstrv(f, dhcp6_domains, NULL, &space);
4293                 }
4294
4295                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4296                         NDiscDNSSL *dd;
4297
4298                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4299                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4300                 }
4301
4302                 fputc('\n', f);
4303
4304                 /************************************************************/
4305
4306                 fputs("ROUTE_DOMAINS=", f);
4307                 space = false;
4308                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4309                         fputs_with_space(f, p, NULL, &space);
4310
4311                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4312                         if (dhcp_domainname)
4313                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4314                         if (dhcp_domains)
4315                                 fputstrv(f, dhcp_domains, NULL, &space);
4316                         if (dhcp6_domains)
4317                                 fputstrv(f, dhcp6_domains, NULL, &space);
4318                 }
4319
4320                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4321                         NDiscDNSSL *dd;
4322
4323                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4324                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4325                 }
4326
4327                 fputc('\n', f);
4328
4329                 /************************************************************/
4330
4331                 fprintf(f, "LLMNR=%s\n",
4332                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4333
4334                 /************************************************************/
4335
4336                 fprintf(f, "MDNS=%s\n",
4337                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4338
4339                 /************************************************************/
4340
4341                 int dns_default_route =
4342                         link->dns_default_route >= 0 ? link->dns_default_route :
4343                         link->network->dns_default_route;
4344                 if (dns_default_route >= 0)
4345                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4346
4347                 /************************************************************/
4348
4349                 DnsOverTlsMode dns_over_tls_mode =
4350                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4351                         link->network->dns_over_tls_mode;
4352                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4353                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4354
4355                 /************************************************************/
4356
4357                 DnssecMode dnssec_mode =
4358                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4359                         link->network->dnssec_mode;
4360                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4361                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4362
4363                 /************************************************************/
4364
4365                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4366                 if (set_isempty(nta_anchors))
4367                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4368
4369                 if (!set_isempty(nta_anchors)) {
4370                         const char *n;
4371
4372                         fputs("DNSSEC_NTA=", f);
4373                         space = false;
4374                         SET_FOREACH(n, nta_anchors, i)
4375                                 fputs_with_space(f, n, NULL, &space);
4376                         fputc('\n', f);
4377                 }
4378
4379                 /************************************************************/
4380
4381                 fputs("ADDRESSES=", f);
4382                 space = false;
4383                 SET_FOREACH(a, link->addresses, i) {
4384                         _cleanup_free_ char *address_str = NULL;
4385
4386                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4387                         if (r < 0)
4388                                 goto fail;
4389
4390                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4391                         space = true;
4392                 }
4393                 fputc('\n', f);
4394
4395                 /************************************************************/
4396
4397                 fputs("ROUTES=", f);
4398                 space = false;
4399                 SET_FOREACH(route, link->routes, i) {
4400                         _cleanup_free_ char *route_str = NULL;
4401
4402                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4403                         if (r < 0)
4404                                 goto fail;
4405
4406                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4407                                 space ? " " : "", route_str,
4408                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4409                         space = true;
4410                 }
4411
4412                 fputc('\n', f);
4413         }
4414
4415         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4416         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4417
4418         if (link->dhcp_lease) {
4419                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4420                 if (r < 0)
4421                         goto fail;
4422
4423                 fprintf(f,
4424                         "DHCP_LEASE=%s\n",
4425                         link->lease_file);
4426         } else
4427                 (void) unlink(link->lease_file);
4428
4429         if (link->ipv4ll) {
4430                 struct in_addr address;
4431
4432                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4433                 if (r >= 0) {
4434                         fputs("IPV4LL_ADDRESS=", f);
4435                         serialize_in_addrs(f, &address, 1, false, NULL);
4436                         fputc('\n', f);
4437                 }
4438         }
4439
4440         if (link->dhcp6_client) {
4441                 _cleanup_free_ char *duid = NULL;
4442                 uint32_t iaid;
4443
4444                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4445                 if (r >= 0)
4446                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4447
4448                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4449                 if (r >= 0)
4450                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4451         }
4452
4453         r = fflush_and_check(f);
4454         if (r < 0)
4455                 goto fail;
4456
4457         if (rename(temp_path, link->state_file) < 0) {
4458                 r = -errno;
4459                 goto fail;
4460         }
4461
4462         return 0;
4463
4464 fail:
4465         (void) unlink(link->state_file);
4466         if (temp_path)
4467                 (void) unlink(temp_path);
4468
4469         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4470 }
4471
4472 /* The serialized state in /run is no longer up-to-date. */
4473 void link_dirty(Link *link) {
4474         int r;
4475
4476         assert(link);
4477
4478         /* mark manager dirty as link is dirty */
4479         manager_dirty(link->manager);
4480
4481         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4482         if (r <= 0)
4483                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4484                 return;
4485         link_ref(link);
4486 }
4487
4488 /* The serialized state in /run is up-to-date */
4489 void link_clean(Link *link) {
4490         assert(link);
4491         assert(link->manager);
4492
4493         link_unref(set_remove(link->manager->dirty_links, link));
4494 }
4495
4496 static const char* const link_state_table[_LINK_STATE_MAX] = {
4497         [LINK_STATE_PENDING] = "pending",
4498         [LINK_STATE_INITIALIZED] = "initialized",
4499         [LINK_STATE_CONFIGURING] = "configuring",
4500         [LINK_STATE_CONFIGURED] = "configured",
4501         [LINK_STATE_UNMANAGED] = "unmanaged",
4502         [LINK_STATE_FAILED] = "failed",
4503         [LINK_STATE_LINGER] = "linger",
4504 };
4505
4506 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4507
4508 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4509         const char *err_msg = NULL;
4510
4511         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4512         return log_link_full(link, level, err,
4513                              "%s: %s%s%s%m",
4514                              msg,
4515                              strempty(err_msg),
4516                              err_msg && !endswith(err_msg, ".") ? "." : "",
4517                              err_msg ? " " : "");
4518 }