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 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                 return;
1090
1091         if (!link->network)
1092                 return;
1093
1094         if (!link->addresses_configured)
1095                 return;
1096
1097         if (!link->neighbors_configured)
1098                 return;
1099
1100         SET_FOREACH(a, link->addresses, i)
1101                 if (!address_is_ready(a))
1102                         return;
1103
1104         if (!link->addresses_ready) {
1105                 link->addresses_ready = true;
1106                 r = link_request_set_routes(link);
1107                 if (r < 0)
1108                         link_enter_failed(link);
1109                 return;
1110         }
1111
1112         if (!link->static_routes_configured)
1113                 return;
1114
1115         if (!link->static_routes_ready) {
1116                 link->static_routes_ready = true;
1117                 r = link_request_set_nexthop(link);
1118                 if (r < 0)
1119                         link_enter_failed(link);
1120                 return;
1121         }
1122
1123         if (!link->static_nexthops_configured)
1124                 return;
1125
1126         if (!link->routing_policy_rules_configured)
1127                 return;
1128
1129         if (!link->tc_configured)
1130                 return;
1131
1132         if (!link->sr_iov_configured)
1133                 return;
1134
1135         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1136
1137                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address)
1138                         return;
1139
1140                 if (link_ipv6ll_enabled(link) &&
1141                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1142                         return;
1143
1144                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link)) &&
1145                     !link->dhcp4_configured &&
1146                     !link->dhcp6_configured &&
1147                     !link->ndisc_configured &&
1148                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address))
1149                         /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1150                          * an IPv4ll fallback address must be configured. */
1151                         return;
1152         }
1153
1154         if (link->state != LINK_STATE_CONFIGURED)
1155                 link_enter_configured(link);
1156
1157         return;
1158 }
1159
1160 static int link_request_set_neighbors(Link *link) {
1161         Neighbor *neighbor;
1162         int r;
1163
1164         assert(link);
1165         assert(link->network);
1166         assert(link->state != _LINK_STATE_INVALID);
1167
1168         link->neighbors_configured = false;
1169
1170         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1171                 r = neighbor_configure(neighbor, link, NULL);
1172                 if (r < 0)
1173                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1174         }
1175
1176         if (link->neighbor_messages == 0) {
1177                 link->neighbors_configured = true;
1178                 link_check_ready(link);
1179         } else {
1180                 log_link_debug(link, "Setting neighbors");
1181                 link_set_state(link, LINK_STATE_CONFIGURING);
1182         }
1183
1184         return 0;
1185 }
1186
1187 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1188         int r;
1189
1190         assert(rtnl);
1191         assert(m);
1192         assert(link);
1193         assert(link->ifname);
1194         assert(link->address_messages > 0);
1195         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1196                LINK_STATE_FAILED, LINK_STATE_LINGER));
1197
1198         link->address_messages--;
1199
1200         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1201                 return 1;
1202
1203         r = sd_netlink_message_get_errno(m);
1204         if (r < 0 && r != -EEXIST) {
1205                 log_link_message_warning_errno(link, m, r, "Could not set address");
1206                 link_enter_failed(link);
1207                 return 1;
1208         } else if (r >= 0)
1209                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1210
1211         if (link->address_messages == 0) {
1212                 log_link_debug(link, "Addresses set");
1213                 link->addresses_configured = true;
1214                 link_check_ready(link);
1215         }
1216
1217         return 1;
1218 }
1219
1220 static int link_set_bridge_fdb(Link *link) {
1221         FdbEntry *fdb_entry;
1222         int r;
1223
1224         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1225                 r = fdb_entry_configure(link, fdb_entry);
1226                 if (r < 0)
1227                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1228         }
1229
1230         return 0;
1231 }
1232
1233 static int link_request_set_addresses(Link *link) {
1234         AddressLabel *label;
1235         Address *ad;
1236         Prefix *p;
1237         int r;
1238
1239         assert(link);
1240         assert(link->network);
1241         assert(link->state != _LINK_STATE_INVALID);
1242
1243         /* Reset all *_configured flags we are configuring. */
1244         link->addresses_configured = false;
1245         link->addresses_ready = false;
1246         link->neighbors_configured = false;
1247         link->static_routes_configured = false;
1248         link->static_routes_ready = false;
1249         link->static_nexthops_configured = false;
1250         link->routing_policy_rules_configured = false;
1251
1252         r = link_set_bridge_fdb(link);
1253         if (r < 0)
1254                 return r;
1255
1256         r = link_request_set_neighbors(link);
1257         if (r < 0)
1258                 return r;
1259
1260         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1261                 bool update;
1262
1263                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1264
1265                 r = address_configure(ad, link, address_handler, update);
1266                 if (r < 0)
1267                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1268                 if (r > 0)
1269                         link->address_messages++;
1270         }
1271
1272         if (IN_SET(link->network->router_prefix_delegation,
1273                    RADV_PREFIX_DELEGATION_STATIC,
1274                    RADV_PREFIX_DELEGATION_BOTH))
1275                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1276                         _cleanup_(address_freep) Address *address = NULL;
1277
1278                         if (!p->assign)
1279                                 continue;
1280
1281                         r = address_new(&address);
1282                         if (r < 0)
1283                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1284
1285                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1286                         if (r < 0)
1287                                 return r;
1288
1289                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1290                         if (r < 0)
1291                                 return r;
1292
1293                         address->family = AF_INET6;
1294                         r = address_configure(address, link, address_handler, true);
1295                         if (r < 0)
1296                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1297                         if (r > 0)
1298                                 link->address_messages++;
1299                 }
1300
1301         LIST_FOREACH(labels, label, link->network->address_labels) {
1302                 r = address_label_configure(label, link, NULL, false);
1303                 if (r < 0)
1304                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1305
1306                 link->address_label_messages++;
1307         }
1308
1309         /* now that we can figure out a default address for the dhcp server,
1310            start it */
1311         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1312                 r = dhcp4_server_configure(link);
1313                 if (r < 0)
1314                         return r;
1315                 log_link_debug(link, "Offering DHCPv4 leases");
1316         }
1317
1318         if (link->address_messages == 0) {
1319                 link->addresses_configured = true;
1320                 link_check_ready(link);
1321         } else {
1322                 log_link_debug(link, "Setting addresses");
1323                 link_set_state(link, LINK_STATE_CONFIGURING);
1324         }
1325
1326         return 0;
1327 }
1328
1329 static int link_set_bridge_vlan(Link *link) {
1330         int r;
1331
1332         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1333         if (r < 0)
1334                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1335
1336         return r;
1337 }
1338
1339 static int link_set_proxy_arp(Link *link) {
1340         int r;
1341
1342         if (!link_proxy_arp_enabled(link))
1343                 return 0;
1344
1345         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1346         if (r < 0)
1347                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1348
1349         return 0;
1350 }
1351
1352 static int link_configure_continue(Link *link);
1353
1354 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1355         int r;
1356
1357         assert(m);
1358         assert(link);
1359         assert(link->ifname);
1360
1361         link->setting_mtu = false;
1362
1363         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1364                 return 1;
1365
1366         r = sd_netlink_message_get_errno(m);
1367         if (r < 0)
1368                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1369         else
1370                 log_link_debug(link, "Setting MTU done.");
1371
1372         if (link->state == LINK_STATE_INITIALIZED) {
1373                 r = link_configure_continue(link);
1374                 if (r < 0)
1375                         link_enter_failed(link);
1376         }
1377
1378         return 1;
1379 }
1380
1381 int link_set_mtu(Link *link, uint32_t mtu) {
1382         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1383         int r;
1384
1385         assert(link);
1386         assert(link->manager);
1387         assert(link->manager->rtnl);
1388
1389         if (mtu == 0 || link->setting_mtu)
1390                 return 0;
1391
1392         if (link->mtu == mtu)
1393                 return 0;
1394
1395         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1396
1397         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1398         if (r < 0)
1399                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1400
1401         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1402          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1403         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1404
1405                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1406                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1407
1408                 mtu = IPV6_MIN_MTU;
1409         }
1410
1411         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1412         if (r < 0)
1413                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1414
1415         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1416                                link_netlink_destroy_callback, link);
1417         if (r < 0)
1418                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1419
1420         link_ref(link);
1421         link->setting_mtu = true;
1422
1423         return 0;
1424 }
1425
1426 static bool link_reduces_vlan_mtu(Link *link) {
1427         /* See netif_reduces_vlan_mtu() in kernel. */
1428         return streq_ptr(link->kind, "macsec");
1429 }
1430
1431 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1432         uint32_t mtu = 0;
1433         NetDev *dev;
1434         Iterator i;
1435
1436         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1437                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1438                         /* See vlan_dev_change_mtu() in kernel. */
1439                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1440
1441                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1442                         /* See macvlan_change_mtu() in kernel. */
1443                         mtu = dev->mtu;
1444
1445         return mtu;
1446 }
1447
1448 static int link_configure_mtu(Link *link) {
1449         uint32_t mtu;
1450
1451         assert(link);
1452         assert(link->network);
1453
1454         if (link->network->mtu > 0)
1455                 return link_set_mtu(link, link->network->mtu);
1456
1457         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1458         if (link->mtu >= mtu)
1459                 return 0;
1460
1461         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1462                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1463                         link->mtu, mtu);
1464
1465         return link_set_mtu(link, mtu);
1466 }
1467
1468 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1469         int r;
1470
1471         assert(m);
1472         assert(link);
1473         assert(link->ifname);
1474
1475         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1476                 return 1;
1477
1478         r = sd_netlink_message_get_errno(m);
1479         if (r < 0)
1480                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1481
1482         return 1;
1483 }
1484
1485 static int link_set_flags(Link *link) {
1486         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1487         unsigned ifi_change = 0;
1488         unsigned ifi_flags = 0;
1489         int r;
1490
1491         assert(link);
1492         assert(link->manager);
1493         assert(link->manager->rtnl);
1494
1495         if (link->flags & IFF_LOOPBACK)
1496                 return 0;
1497
1498         if (!link->network)
1499                 return 0;
1500
1501         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1502                 return 0;
1503
1504         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1505         if (r < 0)
1506                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1507
1508         if (link->network->arp >= 0) {
1509                 ifi_change |= IFF_NOARP;
1510                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1511         }
1512
1513         if (link->network->multicast >= 0) {
1514                 ifi_change |= IFF_MULTICAST;
1515                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1516         }
1517
1518         if (link->network->allmulticast >= 0) {
1519                 ifi_change |= IFF_ALLMULTI;
1520                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1521         }
1522
1523         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1524         if (r < 0)
1525                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1526
1527         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1528                                link_netlink_destroy_callback, link);
1529         if (r < 0)
1530                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1531
1532         link_ref(link);
1533
1534         return 0;
1535 }
1536
1537 static int link_acquire_ipv6_conf(Link *link) {
1538         int r;
1539
1540         assert(link);
1541
1542         if (link_ipv6_accept_ra_enabled(link)) {
1543                 assert(link->ndisc);
1544
1545                 log_link_debug(link, "Discovering IPv6 routers");
1546
1547                 r = sd_ndisc_start(link->ndisc);
1548                 if (r < 0 && r != -EBUSY)
1549                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1550         }
1551
1552         if (link_radv_enabled(link)) {
1553                 assert(link->radv);
1554                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1555
1556                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1557
1558                 r = radv_emit_dns(link);
1559                 if (r < 0)
1560                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1561
1562                 r = sd_radv_start(link->radv);
1563                 if (r < 0 && r != -EBUSY)
1564                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1565         }
1566
1567         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1568                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1569                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1570                 assert(link->dhcp6_client);
1571                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1572
1573                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1574                 if (r < 0 && r != -EBUSY)
1575                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1576                 else
1577                         log_link_debug(link, "Acquiring DHCPv6 lease");
1578         }
1579
1580         (void) dhcp6_request_prefix_delegation(link);
1581
1582         return 0;
1583 }
1584
1585 static int link_acquire_ipv4_conf(Link *link) {
1586         int r;
1587
1588         assert(link);
1589         assert(link->manager);
1590         assert(link->manager->event);
1591
1592         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1593                 assert(link->ipv4ll);
1594
1595                 log_link_debug(link, "Acquiring IPv4 link-local address");
1596
1597                 r = sd_ipv4ll_start(link->ipv4ll);
1598                 if (r < 0)
1599                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1600         }
1601
1602         if (link_dhcp4_enabled(link)) {
1603                 assert(link->dhcp_client);
1604
1605                 log_link_debug(link, "Acquiring DHCPv4 lease");
1606
1607                 r = sd_dhcp_client_start(link->dhcp_client);
1608                 if (r < 0)
1609                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1610         }
1611
1612         return 0;
1613 }
1614
1615 static int link_acquire_conf(Link *link) {
1616         int r;
1617
1618         assert(link);
1619
1620         r = link_acquire_ipv4_conf(link);
1621         if (r < 0)
1622                 return r;
1623
1624         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1625                 r = link_acquire_ipv6_conf(link);
1626                 if (r < 0)
1627                         return r;
1628         }
1629
1630         if (link_lldp_emit_enabled(link)) {
1631                 r = link_lldp_emit_start(link);
1632                 if (r < 0)
1633                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1634         }
1635
1636         return 0;
1637 }
1638
1639 bool link_has_carrier(Link *link) {
1640         /* see Documentation/networking/operstates.txt in the kernel sources */
1641
1642         if (link->kernel_operstate == IF_OPER_UP)
1643                 return true;
1644
1645         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1646                 /* operstate may not be implemented, so fall back to flags */
1647                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1648                     !FLAGS_SET(link->flags, IFF_DORMANT))
1649                         return true;
1650
1651         return false;
1652 }
1653
1654 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1655         int r;
1656
1657         assert(link);
1658
1659         link->setting_genmode = false;
1660
1661         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1662                 return 1;
1663
1664         r = sd_netlink_message_get_errno(m);
1665         if (r < 0)
1666                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1667         else
1668                 log_link_debug(link, "Setting address genmode done.");
1669
1670         if (link->state == LINK_STATE_INITIALIZED) {
1671                 r = link_configure_continue(link);
1672                 if (r < 0)
1673                         link_enter_failed(link);
1674         }
1675
1676         return 1;
1677 }
1678
1679 static int link_configure_addrgen_mode(Link *link) {
1680         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1681         uint8_t ipv6ll_mode;
1682         int r;
1683
1684         assert(link);
1685         assert(link->network);
1686         assert(link->manager);
1687         assert(link->manager->rtnl);
1688
1689         if (!socket_ipv6_is_supported() || link->setting_genmode)
1690                 return 0;
1691
1692         log_link_debug(link, "Setting address genmode for link");
1693
1694         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1695         if (r < 0)
1696                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1697
1698         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1699         if (r < 0)
1700                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1701
1702         r = sd_netlink_message_open_container(req, AF_INET6);
1703         if (r < 0)
1704                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1705
1706         if (!link_ipv6ll_enabled(link))
1707                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1708         else if (link->network->ipv6ll_address_gen_mode < 0) {
1709                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1710                 if (r < 0) {
1711                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1712                          * reading the file fails with EIO. */
1713                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1714
1715                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1716                 } else
1717                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1718         } else
1719                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1720
1721         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1722         if (r < 0)
1723                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1724
1725         r = sd_netlink_message_close_container(req);
1726         if (r < 0)
1727                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1728
1729         r = sd_netlink_message_close_container(req);
1730         if (r < 0)
1731                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1732
1733         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1734                                link_netlink_destroy_callback, link);
1735         if (r < 0)
1736                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1737
1738         link_ref(link);
1739         link->setting_genmode = true;
1740
1741         return 0;
1742 }
1743
1744 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1745         int r;
1746
1747         assert(link);
1748
1749         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1750                 return 1;
1751
1752         r = sd_netlink_message_get_errno(m);
1753         if (r < 0)
1754                 /* we warn but don't fail the link, as it may be brought up later */
1755                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1756
1757         return 1;
1758 }
1759
1760 static int link_up(Link *link) {
1761         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1762         int r;
1763
1764         assert(link);
1765         assert(link->network);
1766         assert(link->manager);
1767         assert(link->manager->rtnl);
1768
1769         log_link_debug(link, "Bringing link up");
1770
1771         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1772         if (r < 0)
1773                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1774
1775         /* set it free if not enslaved with networkd */
1776         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1777                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1778                 if (r < 0)
1779                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1780         }
1781
1782         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1783         if (r < 0)
1784                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1785
1786         if (link->network->mac) {
1787                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1788                 if (r < 0)
1789                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1790         }
1791
1792         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1793                                link_netlink_destroy_callback, link);
1794         if (r < 0)
1795                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1796
1797         link_ref(link);
1798
1799         return 0;
1800 }
1801
1802 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1803         int r;
1804
1805         assert(link);
1806
1807         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1808                 return 1;
1809
1810         r = sd_netlink_message_get_errno(m);
1811         if (r < 0)
1812                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1813
1814         return 1;
1815 }
1816
1817 int link_down(Link *link, link_netlink_message_handler_t callback) {
1818         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1819         int r;
1820
1821         assert(link);
1822         assert(link->manager);
1823         assert(link->manager->rtnl);
1824
1825         log_link_debug(link, "Bringing link down");
1826
1827         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1828                                      RTM_SETLINK, link->ifindex);
1829         if (r < 0)
1830                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1831
1832         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1833         if (r < 0)
1834                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1835
1836         r = netlink_call_async(link->manager->rtnl, NULL, req,
1837                                callback ?: link_down_handler,
1838                                link_netlink_destroy_callback, link);
1839         if (r < 0)
1840                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1841
1842         link_ref(link);
1843
1844         return 0;
1845 }
1846
1847 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1848         int r;
1849
1850         assert(link);
1851
1852         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1853                 return 1;
1854
1855         r = sd_netlink_message_get_errno(m);
1856         if (r < 0)
1857                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1858
1859         return 1;
1860 }
1861
1862 static int link_set_group(Link *link) {
1863         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1864         int r;
1865
1866         assert(link);
1867         assert(link->network);
1868         assert(link->manager);
1869         assert(link->manager->rtnl);
1870
1871         if (link->network->group <= 0)
1872                 return 0;
1873
1874         log_link_debug(link, "Setting group");
1875
1876         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1877         if (r < 0)
1878                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1879
1880         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1881         if (r < 0)
1882                 return log_link_error_errno(link, r, "Could not set link group: %m");
1883
1884         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1885                                link_netlink_destroy_callback, link);
1886         if (r < 0)
1887                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1888
1889         link_ref(link);
1890
1891         return 0;
1892 }
1893
1894 static int link_handle_bound_to_list(Link *link) {
1895         Link *l;
1896         Iterator i;
1897         int r;
1898         bool required_up = false;
1899         bool link_is_up = false;
1900
1901         assert(link);
1902
1903         if (hashmap_isempty(link->bound_to_links))
1904                 return 0;
1905
1906         if (link->flags & IFF_UP)
1907                 link_is_up = true;
1908
1909         HASHMAP_FOREACH (l, link->bound_to_links, i)
1910                 if (link_has_carrier(l)) {
1911                         required_up = true;
1912                         break;
1913                 }
1914
1915         if (!required_up && link_is_up) {
1916                 r = link_down(link, NULL);
1917                 if (r < 0)
1918                         return r;
1919         } else if (required_up && !link_is_up) {
1920                 r = link_up(link);
1921                 if (r < 0)
1922                         return r;
1923         }
1924
1925         return 0;
1926 }
1927
1928 static int link_handle_bound_by_list(Link *link) {
1929         Iterator i;
1930         Link *l;
1931         int r;
1932
1933         assert(link);
1934
1935         if (hashmap_isempty(link->bound_by_links))
1936                 return 0;
1937
1938         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1939                 r = link_handle_bound_to_list(l);
1940                 if (r < 0)
1941                         return r;
1942         }
1943
1944         return 0;
1945 }
1946
1947 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1948         int r;
1949
1950         assert(link);
1951         assert(carrier);
1952
1953         if (link == carrier)
1954                 return 0;
1955
1956         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1957                 return 0;
1958
1959         r = hashmap_ensure_allocated(h, NULL);
1960         if (r < 0)
1961                 return r;
1962
1963         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1964         if (r < 0)
1965                 return r;
1966
1967         return 0;
1968 }
1969
1970 static int link_new_bound_by_list(Link *link) {
1971         Manager *m;
1972         Link *carrier;
1973         Iterator i;
1974         int r;
1975         bool list_updated = false;
1976
1977         assert(link);
1978         assert(link->manager);
1979
1980         m = link->manager;
1981
1982         HASHMAP_FOREACH(carrier, m->links, i) {
1983                 if (!carrier->network)
1984                         continue;
1985
1986                 if (strv_isempty(carrier->network->bind_carrier))
1987                         continue;
1988
1989                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
1990                         r = link_put_carrier(link, carrier, &link->bound_by_links);
1991                         if (r < 0)
1992                                 return r;
1993
1994                         list_updated = true;
1995                 }
1996         }
1997
1998         if (list_updated)
1999                 link_dirty(link);
2000
2001         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2002                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2003                 if (r < 0)
2004                         return r;
2005
2006                 link_dirty(carrier);
2007         }
2008
2009         return 0;
2010 }
2011
2012 static int link_new_bound_to_list(Link *link) {
2013         Manager *m;
2014         Link *carrier;
2015         Iterator i;
2016         int r;
2017         bool list_updated = false;
2018
2019         assert(link);
2020         assert(link->manager);
2021
2022         if (!link->network)
2023                 return 0;
2024
2025         if (strv_isempty(link->network->bind_carrier))
2026                 return 0;
2027
2028         m = link->manager;
2029
2030         HASHMAP_FOREACH (carrier, m->links, i) {
2031                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2032                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2033                         if (r < 0)
2034                                 return r;
2035
2036                         list_updated = true;
2037                 }
2038         }
2039
2040         if (list_updated)
2041                 link_dirty(link);
2042
2043         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2044                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2045                 if (r < 0)
2046                         return r;
2047
2048                 link_dirty(carrier);
2049         }
2050
2051         return 0;
2052 }
2053
2054 static int link_new_carrier_maps(Link *link) {
2055         int r;
2056
2057         r = link_new_bound_by_list(link);
2058         if (r < 0)
2059                 return r;
2060
2061         r = link_handle_bound_by_list(link);
2062         if (r < 0)
2063                 return r;
2064
2065         r = link_new_bound_to_list(link);
2066         if (r < 0)
2067                 return r;
2068
2069         r = link_handle_bound_to_list(link);
2070         if (r < 0)
2071                 return r;
2072
2073         return 0;
2074 }
2075
2076 static void link_free_bound_to_list(Link *link) {
2077         Link *bound_to;
2078         Iterator i;
2079
2080         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2081                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2082
2083                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2084                         link_dirty(bound_to);
2085         }
2086
2087         return;
2088 }
2089
2090 static void link_free_bound_by_list(Link *link) {
2091         Link *bound_by;
2092         Iterator i;
2093
2094         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2095                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2096
2097                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2098                         link_dirty(bound_by);
2099                         link_handle_bound_to_list(bound_by);
2100                 }
2101         }
2102
2103         return;
2104 }
2105
2106 static void link_free_carrier_maps(Link *link) {
2107         bool list_updated = false;
2108
2109         assert(link);
2110
2111         if (!hashmap_isempty(link->bound_to_links)) {
2112                 link_free_bound_to_list(link);
2113                 list_updated = true;
2114         }
2115
2116         if (!hashmap_isempty(link->bound_by_links)) {
2117                 link_free_bound_by_list(link);
2118                 list_updated = true;
2119         }
2120
2121         if (list_updated)
2122                 link_dirty(link);
2123
2124         return;
2125 }
2126
2127 static int link_append_to_master(Link *link, NetDev *netdev) {
2128         Link *master;
2129         int r;
2130
2131         assert(link);
2132         assert(netdev);
2133
2134         r = link_get(link->manager, netdev->ifindex, &master);
2135         if (r < 0)
2136                 return r;
2137
2138         r = set_ensure_put(&master->slaves, NULL, link);
2139         if (r <= 0)
2140                 return r;
2141
2142         link_ref(link);
2143         return 0;
2144 }
2145
2146 static void link_drop_from_master(Link *link, NetDev *netdev) {
2147         Link *master;
2148
2149         assert(link);
2150
2151         if (!link->manager || !netdev)
2152                 return;
2153
2154         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2155                 return;
2156
2157         link_unref(set_remove(master->slaves, link));
2158 }
2159
2160 static void link_detach_from_manager(Link *link) {
2161         if (!link || !link->manager)
2162                 return;
2163
2164         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2165         link_clean(link);
2166
2167         /* The following must be called at last. */
2168         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2169         link_unref(link);
2170 }
2171
2172 void link_drop(Link *link) {
2173         if (!link || link->state == LINK_STATE_LINGER)
2174                 return;
2175
2176         link_set_state(link, LINK_STATE_LINGER);
2177
2178         link_free_carrier_maps(link);
2179
2180         if (link->network) {
2181                 link_drop_from_master(link, link->network->bridge);
2182                 link_drop_from_master(link, link->network->bond);
2183         }
2184
2185         log_link_debug(link, "Link removed");
2186
2187         (void) unlink(link->state_file);
2188         link_detach_from_manager(link);
2189 }
2190
2191 static int link_joined(Link *link) {
2192         int r;
2193
2194         assert(link);
2195         assert(link->network);
2196
2197         if (!hashmap_isempty(link->bound_to_links)) {
2198                 r = link_handle_bound_to_list(link);
2199                 if (r < 0)
2200                         return r;
2201         } else if (!(link->flags & IFF_UP)) {
2202                 r = link_up(link);
2203                 if (r < 0) {
2204                         link_enter_failed(link);
2205                         return r;
2206                 }
2207         }
2208
2209         if (link->network->bridge) {
2210                 r = link_set_bridge(link);
2211                 if (r < 0)
2212                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2213
2214                 r = link_append_to_master(link, link->network->bridge);
2215                 if (r < 0)
2216                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2217         }
2218
2219         if (link->network->bond) {
2220                 r = link_set_bond(link);
2221                 if (r < 0)
2222                         log_link_error_errno(link, r, "Could not set bond message: %m");
2223
2224                 r = link_append_to_master(link, link->network->bond);
2225                 if (r < 0)
2226                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2227         }
2228
2229         if (link->network->use_br_vlan &&
2230             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2231                 r = link_set_bridge_vlan(link);
2232                 if (r < 0)
2233                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2234         }
2235
2236         /* Skip setting up addresses until it gets carrier,
2237            or it would try to set addresses twice,
2238            which is bad for non-idempotent steps. */
2239         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2240                 return 0;
2241
2242         link_set_state(link, LINK_STATE_CONFIGURING);
2243         return link_request_set_addresses(link);
2244 }
2245
2246 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2247         int r;
2248
2249         assert(link);
2250         assert(link->network);
2251         assert(link->enslaving > 0);
2252
2253         link->enslaving--;
2254
2255         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2256                 return 1;
2257
2258         r = sd_netlink_message_get_errno(m);
2259         if (r < 0 && r != -EEXIST) {
2260                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2261                 link_enter_failed(link);
2262                 return 1;
2263         }
2264
2265         log_link_debug(link, "Joined netdev");
2266
2267         if (link->enslaving == 0) {
2268                 r = link_joined(link);
2269                 if (r < 0)
2270                         link_enter_failed(link);
2271         }
2272
2273         return 1;
2274 }
2275
2276 static int link_enter_join_netdev(Link *link) {
2277         NetDev *netdev;
2278         Iterator i;
2279         int r;
2280
2281         assert(link);
2282         assert(link->network);
2283         assert(link->state == LINK_STATE_INITIALIZED);
2284
2285         link_set_state(link, LINK_STATE_CONFIGURING);
2286
2287         link_dirty(link);
2288         link->enslaving = 0;
2289
2290         if (link->network->bond) {
2291                 if (link->network->bond->state == NETDEV_STATE_READY &&
2292                     link->network->bond->ifindex == link->master_ifindex)
2293                         return link_joined(link);
2294
2295                 log_struct(LOG_DEBUG,
2296                            LOG_LINK_INTERFACE(link),
2297                            LOG_NETDEV_INTERFACE(link->network->bond),
2298                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2299
2300                 link->enslaving++;
2301
2302                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2303                 if (r < 0) {
2304                         log_struct_errno(LOG_WARNING, r,
2305                                          LOG_LINK_INTERFACE(link),
2306                                          LOG_NETDEV_INTERFACE(link->network->bond),
2307                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2308                         link_enter_failed(link);
2309                         return r;
2310                 }
2311         }
2312
2313         if (link->network->bridge) {
2314                 log_struct(LOG_DEBUG,
2315                            LOG_LINK_INTERFACE(link),
2316                            LOG_NETDEV_INTERFACE(link->network->bridge),
2317                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2318
2319                 link->enslaving++;
2320
2321                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2322                 if (r < 0) {
2323                         log_struct_errno(LOG_WARNING, r,
2324                                          LOG_LINK_INTERFACE(link),
2325                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2326                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2327                         link_enter_failed(link);
2328                         return r;
2329                 }
2330         }
2331
2332         if (link->network->vrf) {
2333                 log_struct(LOG_DEBUG,
2334                            LOG_LINK_INTERFACE(link),
2335                            LOG_NETDEV_INTERFACE(link->network->vrf),
2336                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2337
2338                 link->enslaving++;
2339
2340                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2341                 if (r < 0) {
2342                         log_struct_errno(LOG_WARNING, r,
2343                                          LOG_LINK_INTERFACE(link),
2344                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2345                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2346                         link_enter_failed(link);
2347                         return r;
2348                 }
2349         }
2350
2351         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2352
2353                 if (netdev->ifindex > 0)
2354                         /* Assume already enslaved. */
2355                         continue;
2356
2357                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2358                         continue;
2359
2360                 log_struct(LOG_DEBUG,
2361                            LOG_LINK_INTERFACE(link),
2362                            LOG_NETDEV_INTERFACE(netdev),
2363                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2364
2365                 link->enslaving++;
2366
2367                 r = netdev_join(netdev, link, netdev_join_handler);
2368                 if (r < 0) {
2369                         log_struct_errno(LOG_WARNING, r,
2370                                          LOG_LINK_INTERFACE(link),
2371                                          LOG_NETDEV_INTERFACE(netdev),
2372                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2373                         link_enter_failed(link);
2374                         return r;
2375                 }
2376         }
2377
2378         if (link->enslaving == 0)
2379                 return link_joined(link);
2380
2381         return 0;
2382 }
2383
2384 static int link_set_ipv4_forward(Link *link) {
2385         int r;
2386
2387         if (!link_ipv4_forward_enabled(link))
2388                 return 0;
2389
2390         /* We propagate the forwarding flag from one interface to the
2391          * global setting one way. This means: as long as at least one
2392          * interface was configured at any time that had IP forwarding
2393          * enabled the setting will stay on for good. We do this
2394          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2395          * somewhat in sync (see below). */
2396
2397         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2398         if (r < 0)
2399                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2400
2401         return 0;
2402 }
2403
2404 static int link_set_ipv6_forward(Link *link) {
2405         int r;
2406
2407         if (!link_ipv6_forward_enabled(link))
2408                 return 0;
2409
2410         /* On Linux, the IPv6 stack does not know a per-interface
2411          * packet forwarding setting: either packet forwarding is on
2412          * for all, or off for all. We hence don't bother with a
2413          * per-interface setting, but simply propagate the interface
2414          * flag, if it is set, to the global flag, one-way. Note that
2415          * while IPv4 would allow a per-interface flag, we expose the
2416          * same behaviour there and also propagate the setting from
2417          * one to all, to keep things simple (see above). */
2418
2419         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2420         if (r < 0)
2421                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2422
2423         return 0;
2424 }
2425
2426 static int link_set_ipv6_privacy_extensions(Link *link) {
2427         IPv6PrivacyExtensions s;
2428         int r;
2429
2430         s = link_ipv6_privacy_extensions(link);
2431         if (s < 0)
2432                 return 0;
2433
2434         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2435         if (r < 0)
2436                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2437
2438         return 0;
2439 }
2440
2441 static int link_set_ipv6_accept_ra(Link *link) {
2442         int r;
2443
2444         /* Make this a NOP if IPv6 is not available */
2445         if (!socket_ipv6_is_supported())
2446                 return 0;
2447
2448         if (link->flags & IFF_LOOPBACK)
2449                 return 0;
2450
2451         if (!link->network)
2452                 return 0;
2453
2454         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2455         if (r < 0)
2456                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2457
2458         return 0;
2459 }
2460
2461 static int link_set_ipv6_dad_transmits(Link *link) {
2462         int r;
2463
2464         /* Make this a NOP if IPv6 is not available */
2465         if (!socket_ipv6_is_supported())
2466                 return 0;
2467
2468         if (link->flags & IFF_LOOPBACK)
2469                 return 0;
2470
2471         if (!link->network)
2472                 return 0;
2473
2474         if (link->network->ipv6_dad_transmits < 0)
2475                 return 0;
2476
2477         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2478         if (r < 0)
2479                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2480
2481         return 0;
2482 }
2483
2484 static int link_set_ipv6_hop_limit(Link *link) {
2485         int r;
2486
2487         /* Make this a NOP if IPv6 is not available */
2488         if (!socket_ipv6_is_supported())
2489                 return 0;
2490
2491         if (link->flags & IFF_LOOPBACK)
2492                 return 0;
2493
2494         if (!link->network)
2495                 return 0;
2496
2497         if (link->network->ipv6_hop_limit < 0)
2498                 return 0;
2499
2500         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2501         if (r < 0)
2502                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2503
2504         return 0;
2505 }
2506
2507 static int link_set_ipv6_mtu(Link *link) {
2508         int r;
2509
2510         /* Make this a NOP if IPv6 is not available */
2511         if (!socket_ipv6_is_supported())
2512                 return 0;
2513
2514         if (link->flags & IFF_LOOPBACK)
2515                 return 0;
2516
2517         if (link->network->ipv6_mtu == 0)
2518                 return 0;
2519
2520         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2521          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2522         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2523                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2524                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2525         }
2526
2527         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2528         if (r < 0) {
2529                 if (link->mtu < link->network->ipv6_mtu)
2530                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2531                                          link->network->ipv6_mtu, link->mtu);
2532                 else
2533                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2534         }
2535
2536         link->ipv6_mtu_set = true;
2537
2538         return 0;
2539 }
2540
2541 static int link_set_ipv4_accept_local(Link *link) {
2542         int r;
2543
2544         if (link->flags & IFF_LOOPBACK)
2545                 return 0;
2546
2547         if (link->network->ipv4_accept_local < 0)
2548                 return 0;
2549
2550         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2551         if (r < 0)
2552                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2553
2554         return 0;
2555 }
2556
2557 static bool link_is_static_address_configured(Link *link, Address *address) {
2558         Address *net_address;
2559
2560         assert(link);
2561         assert(address);
2562
2563         if (!link->network)
2564                 return false;
2565
2566         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2567                 if (address_equal(net_address, address))
2568                         return true;
2569
2570         return false;
2571 }
2572
2573 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2574         Neighbor *net_neighbor;
2575
2576         assert(link);
2577         assert(neighbor);
2578
2579         if (!link->network)
2580                 return false;
2581
2582         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2583                 if (neighbor_equal(net_neighbor, neighbor))
2584                         return true;
2585
2586         return false;
2587 }
2588
2589 static bool link_is_static_route_configured(Link *link, Route *route) {
2590         Route *net_route;
2591
2592         assert(link);
2593         assert(route);
2594
2595         if (!link->network)
2596                 return false;
2597
2598         LIST_FOREACH(routes, net_route, link->network->static_routes)
2599                 if (route_equal(net_route, route))
2600                         return true;
2601
2602         return false;
2603 }
2604
2605 static bool link_address_is_dynamic(Link *link, Address *address) {
2606         Route *route;
2607         Iterator i;
2608
2609         assert(link);
2610         assert(address);
2611
2612         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2613                 return true;
2614
2615         /* Even when the address is leased from a DHCP server, networkd assign the address
2616          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2617          * corresponding routes with RTPROT_DHCP. */
2618         SET_FOREACH(route, link->routes_foreign, i) {
2619                 if (route->protocol != RTPROT_DHCP)
2620                         continue;
2621
2622                 if (address->family != route->family)
2623                         continue;
2624
2625                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2626                         return true;
2627         }
2628
2629         return false;
2630 }
2631
2632 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2633         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2634         sd_netlink_message *addr;
2635         int r;
2636
2637         assert(link);
2638         assert(link->manager);
2639         assert(link->manager->rtnl);
2640
2641         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2642         if (r < 0)
2643                 return r;
2644
2645         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2646         if (r < 0)
2647                 return r;
2648
2649         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2650                 unsigned char flags;
2651                 int ifindex;
2652
2653                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2654                 if (r < 0) {
2655                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2656                         continue;
2657                 } else if (link->ifindex != ifindex)
2658                         continue;
2659
2660                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2661                 if (r < 0) {
2662                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2663                         continue;
2664                 } else if (!(flags & IFA_F_TENTATIVE))
2665                         continue;
2666
2667                 log_link_debug(link, "Found tentative ipv6 link-local address");
2668                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2669         }
2670
2671         return 0;
2672 }
2673
2674 static int link_drop_foreign_config(Link *link) {
2675         Address *address;
2676         Neighbor *neighbor;
2677         Route *route;
2678         Iterator i;
2679         int r;
2680
2681         /* The kernel doesn't notify us about tentative addresses;
2682          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2683         if (!link_ipv6ll_enabled(link)) {
2684                 r = link_enumerate_ipv6_tentative_addresses(link);
2685                 if (r < 0)
2686                         return r;
2687         }
2688
2689         SET_FOREACH(address, link->addresses_foreign, i) {
2690                 /* we consider IPv6LL addresses to be managed by the kernel */
2691                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2692                         continue;
2693
2694                 if (link_address_is_dynamic(link, address)) {
2695                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2696                                 continue;
2697                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2698                         continue;
2699
2700                 if (link_is_static_address_configured(link, address)) {
2701                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2702                         if (r < 0)
2703                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2704                 } else {
2705                         r = address_remove(address, link, NULL);
2706                         if (r < 0)
2707                                 return r;
2708                 }
2709         }
2710
2711         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2712                 if (link_is_neighbor_configured(link, neighbor)) {
2713                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2714                         if (r < 0)
2715                                 return r;
2716                 } else {
2717                         r = neighbor_remove(neighbor, link, NULL);
2718                         if (r < 0)
2719                                 return r;
2720                 }
2721         }
2722
2723         SET_FOREACH(route, link->routes_foreign, i) {
2724                 /* do not touch routes managed by the kernel */
2725                 if (route->protocol == RTPROT_KERNEL)
2726                         continue;
2727
2728                 /* do not touch multicast route added by kernel */
2729                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2730                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2731                 if (route->protocol == RTPROT_BOOT &&
2732                     route->family == AF_INET6 &&
2733                     route->dst_prefixlen == 8 &&
2734                     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 }}} }))
2735                         continue;
2736
2737                 if (route->protocol == RTPROT_STATIC && link->network &&
2738                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2739                         continue;
2740
2741                 if (route->protocol == RTPROT_DHCP && link->network &&
2742                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2743                         continue;
2744
2745                 if (link_is_static_route_configured(link, route)) {
2746                         r = route_add(link, route, NULL);
2747                         if (r < 0)
2748                                 return r;
2749                 } else {
2750                         r = route_remove(route, link, NULL);
2751                         if (r < 0)
2752                                 return r;
2753                 }
2754         }
2755
2756         return 0;
2757 }
2758
2759 static int link_drop_config(Link *link) {
2760         Address *address, *pool_address;
2761         Neighbor *neighbor;
2762         Route *route;
2763         Iterator i;
2764         int r;
2765
2766         SET_FOREACH(address, link->addresses, i) {
2767                 /* we consider IPv6LL addresses to be managed by the kernel */
2768                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2769                         continue;
2770
2771                 r = address_remove(address, link, NULL);
2772                 if (r < 0)
2773                         return r;
2774
2775                 /* If this address came from an address pool, clean up the pool */
2776                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2777                         if (address_equal(address, pool_address)) {
2778                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2779                                 address_free(pool_address);
2780                                 break;
2781                         }
2782                 }
2783         }
2784
2785         SET_FOREACH(neighbor, link->neighbors, i) {
2786                 r = neighbor_remove(neighbor, link, NULL);
2787                 if (r < 0)
2788                         return r;
2789         }
2790
2791         SET_FOREACH(route, link->routes, i) {
2792                 /* do not touch routes managed by the kernel */
2793                 if (route->protocol == RTPROT_KERNEL)
2794                         continue;
2795
2796                 r = route_remove(route, link, NULL);
2797                 if (r < 0)
2798                         return r;
2799         }
2800
2801         ndisc_flush(link);
2802
2803         return 0;
2804 }
2805
2806 static int link_configure_ipv4_dad(Link *link) {
2807         Address *address;
2808         int r;
2809
2810         assert(link);
2811         assert(link->network);
2812
2813         LIST_FOREACH(addresses, address, link->network->static_addresses)
2814                 if (address->family == AF_INET &&
2815                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2816                         r = configure_ipv4_duplicate_address_detection(link, address);
2817                         if (r < 0)
2818                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2819                 }
2820
2821         return 0;
2822 }
2823
2824 static int link_configure_traffic_control(Link *link) {
2825         TrafficControl *tc;
2826         Iterator i;
2827         int r;
2828
2829         link->tc_configured = false;
2830         link->tc_messages = 0;
2831
2832         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2833                 r = traffic_control_configure(link, tc);
2834                 if (r < 0)
2835                         return r;
2836         }
2837
2838         if (link->tc_messages == 0)
2839                 link->tc_configured = true;
2840         else
2841                 log_link_debug(link, "Configuring traffic control");
2842
2843         return 0;
2844 }
2845
2846 static int link_configure_sr_iov(Link *link) {
2847         SRIOV *sr_iov;
2848         Iterator i;
2849         int r;
2850
2851         link->sr_iov_configured = false;
2852         link->sr_iov_messages = 0;
2853
2854         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2855                 r = sr_iov_configure(link, sr_iov);
2856                 if (r < 0)
2857                         return r;
2858         }
2859
2860         if (link->sr_iov_messages == 0)
2861                 link->sr_iov_configured = true;
2862         else
2863                 log_link_debug(link, "Configuring SR-IOV");
2864
2865         return 0;
2866 }
2867
2868 static int link_configure(Link *link) {
2869         int r;
2870
2871         assert(link);
2872         assert(link->network);
2873         assert(link->state == LINK_STATE_INITIALIZED);
2874
2875         r = link_configure_traffic_control(link);
2876         if (r < 0)
2877                 return r;
2878
2879         r = link_configure_sr_iov(link);
2880         if (r < 0)
2881                 return r;
2882
2883         if (link->iftype == ARPHRD_CAN)
2884                 return link_configure_can(link);
2885
2886         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2887          * for this interface, then enable IPv6 */
2888         (void) link_update_ipv6_sysctl(link);
2889
2890         r = link_set_proxy_arp(link);
2891         if (r < 0)
2892                return r;
2893
2894         r = ipv6_proxy_ndp_addresses_configure(link);
2895         if (r < 0)
2896                 return r;
2897
2898         r = link_set_ipv4_forward(link);
2899         if (r < 0)
2900                 return r;
2901
2902         r = link_set_ipv6_forward(link);
2903         if (r < 0)
2904                 return r;
2905
2906         r = link_set_ipv6_privacy_extensions(link);
2907         if (r < 0)
2908                 return r;
2909
2910         r = link_set_ipv6_accept_ra(link);
2911         if (r < 0)
2912                 return r;
2913
2914         r = link_set_ipv6_dad_transmits(link);
2915         if (r < 0)
2916                 return r;
2917
2918         r = link_set_ipv6_hop_limit(link);
2919         if (r < 0)
2920                 return r;
2921
2922         r = link_set_ipv4_accept_local(link);
2923         if (r < 0)
2924                 return r;
2925
2926         r = link_set_flags(link);
2927         if (r < 0)
2928                 return r;
2929
2930         r = link_set_group(link);
2931         if (r < 0)
2932                 return r;
2933
2934         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2935                 r = ipv4ll_configure(link);
2936                 if (r < 0)
2937                         return r;
2938         }
2939
2940         if (link_dhcp4_enabled(link)) {
2941                 r = dhcp4_set_promote_secondaries(link);
2942                 if (r < 0)
2943                         return r;
2944
2945                 r = dhcp4_configure(link);
2946                 if (r < 0)
2947                         return r;
2948         }
2949
2950         if (link_dhcp4_server_enabled(link)) {
2951                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2952                 if (r < 0)
2953                         return r;
2954
2955                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2956                 if (r < 0)
2957                         return r;
2958         }
2959
2960         if (link_dhcp6_enabled(link) ||
2961             link_ipv6_accept_ra_enabled(link)) {
2962                 r = dhcp6_configure(link);
2963                 if (r < 0)
2964                         return r;
2965         }
2966
2967         if (link_ipv6_accept_ra_enabled(link)) {
2968                 r = ndisc_configure(link);
2969                 if (r < 0)
2970                         return r;
2971         }
2972
2973         if (link_radv_enabled(link)) {
2974                 r = radv_configure(link);
2975                 if (r < 0)
2976                         return r;
2977         }
2978
2979         if (link_lldp_rx_enabled(link)) {
2980                 r = link_lldp_rx_configure(link);
2981                 if (r < 0)
2982                         return r;
2983         }
2984
2985         r = link_configure_mtu(link);
2986         if (r < 0)
2987                 return r;
2988
2989         r = link_configure_addrgen_mode(link);
2990         if (r < 0)
2991                 return r;
2992
2993         r = link_configure_ipv4_dad(link);
2994         if (r < 0)
2995                 return r;
2996
2997         return link_configure_continue(link);
2998 }
2999
3000 /* The configuration continues in this separate function, instead of
3001  * including this in the above link_configure() function, for two
3002  * reasons:
3003  * 1) some devices reset the link when the mtu is set, which caused
3004  *    an infinite loop here in networkd; see:
3005  *    https://github.com/systemd/systemd/issues/6593
3006  *    https://github.com/systemd/systemd/issues/9831
3007  * 2) if ipv6ll is disabled, then bringing the interface up must be
3008  *    delayed until after we get confirmation from the kernel that
3009  *    the addr_gen_mode parameter has been set (via netlink), see:
3010  *    https://github.com/systemd/systemd/issues/13882
3011  */
3012 static int link_configure_continue(Link *link) {
3013         int r;
3014
3015         assert(link);
3016         assert(link->network);
3017         assert(link->state == LINK_STATE_INITIALIZED);
3018
3019         if (link->setting_mtu || link->setting_genmode)
3020                 return 0;
3021
3022         /* Drop foreign config, but ignore loopback or critical devices.
3023          * We do not want to remove loopback address or addresses used for root NFS. */
3024         if (!(link->flags & IFF_LOOPBACK) &&
3025             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3026                 r = link_drop_foreign_config(link);
3027                 if (r < 0)
3028                         return r;
3029         }
3030
3031         /* The kernel resets ipv6 mtu after changing device mtu;
3032          * we must set this here, after we've set device mtu */
3033         r = link_set_ipv6_mtu(link);
3034         if (r < 0)
3035                 return r;
3036
3037         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3038                 r = link_acquire_conf(link);
3039                 if (r < 0)
3040                         return r;
3041         }
3042
3043         return link_enter_join_netdev(link);
3044 }
3045
3046 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3047         assert(duid);
3048
3049         if (duid->raw_data_len > 0)
3050                 return 0;
3051
3052         if (duid->type != DUID_TYPE_UUID)
3053                 return -EINVAL;
3054
3055         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3056         duid->raw_data_len = sizeof(sd_id128_t);
3057
3058         return 1;
3059 }
3060
3061 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3062         Manager *manager = userdata;
3063         const sd_bus_error *e;
3064         const void *a;
3065         size_t sz;
3066         DUID *duid;
3067         Link *link;
3068         int r;
3069
3070         assert(m);
3071         assert(manager);
3072
3073         e = sd_bus_message_get_error(m);
3074         if (e) {
3075                 log_error_errno(sd_bus_error_get_errno(e),
3076                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3077                                 e->message);
3078                 goto configure;
3079         }
3080
3081         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3082         if (r < 0)
3083                 goto configure;
3084
3085         if (sz != sizeof(sd_id128_t)) {
3086                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3087                 goto configure;
3088         }
3089
3090         memcpy(&manager->product_uuid, a, sz);
3091         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3092                 (void) duid_set_uuid(duid, manager->product_uuid);
3093
3094         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3095
3096 configure:
3097         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3098                 link_unref(link);
3099
3100                 r = link_configure(link);
3101                 if (r < 0)
3102                         link_enter_failed(link);
3103         }
3104
3105         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3106
3107         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3108          * even if the method fails. */
3109         manager->has_product_uuid = true;
3110
3111         return 1;
3112 }
3113
3114 static bool link_requires_uuid(Link *link) {
3115         const DUID *duid;
3116
3117         assert(link);
3118         assert(link->manager);
3119         assert(link->network);
3120
3121         duid = link_get_duid(link);
3122         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3123                 return false;
3124
3125         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3126                 return true;
3127
3128         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3129                 return true;
3130
3131         return false;
3132 }
3133
3134 static int link_configure_duid(Link *link) {
3135         Manager *m;
3136         DUID *duid;
3137         int r;
3138
3139         assert(link);
3140         assert(link->manager);
3141         assert(link->network);
3142
3143         m = link->manager;
3144         duid = link_get_duid(link);
3145
3146         if (!link_requires_uuid(link))
3147                 return 1;
3148
3149         if (m->has_product_uuid) {
3150                 (void) duid_set_uuid(duid, m->product_uuid);
3151                 return 1;
3152         }
3153
3154         if (!m->links_requesting_uuid) {
3155                 r = manager_request_product_uuid(m, link);
3156                 if (r < 0) {
3157                         if (r == -ENOMEM)
3158                                 return r;
3159
3160                         log_link_warning_errno(link, r,
3161                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3162                         return 1;
3163                 }
3164         } else {
3165                 r = set_put(m->links_requesting_uuid, link);
3166                 if (r < 0)
3167                         return log_oom();
3168                 if (r > 0)
3169                         link_ref(link);
3170
3171                 r = set_put(m->duids_requesting_uuid, duid);
3172                 if (r < 0)
3173                         return log_oom();
3174         }
3175
3176         return 0;
3177 }
3178
3179 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3180         Network *network;
3181         int r;
3182
3183         if (m) {
3184                 _cleanup_strv_free_ char **s = NULL;
3185
3186                 r = sd_netlink_message_get_errno(m);
3187                 if (r < 0)
3188                         return r;
3189
3190                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3191                 if (r < 0 && r != -ENODATA)
3192                         return r;
3193
3194                 strv_free_and_replace(link->alternative_names, s);
3195         }
3196
3197         r = network_get(link->manager, link->iftype, link->sd_device,
3198                         link->ifname, link->alternative_names, link->driver,
3199                         &link->mac, &link->permanent_mac,
3200                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3201         if (r == -ENOENT) {
3202                 link_enter_unmanaged(link);
3203                 return 0;
3204         } else if (r == 0 && network->unmanaged) {
3205                 link_enter_unmanaged(link);
3206                 return 0;
3207         } else if (r < 0)
3208                 return r;
3209
3210         if (link->network == network && !force)
3211                 return 0;
3212
3213         log_link_info(link, "Re-configuring with %s", network->filename);
3214
3215         /* Dropping old .network file */
3216         r = link_stop_clients(link, false);
3217         if (r < 0)
3218                 return r;
3219
3220         if (link_dhcp4_server_enabled(link))
3221                 (void) sd_dhcp_server_stop(link->dhcp_server);
3222
3223         r = link_drop_config(link);
3224         if (r < 0)
3225                 return r;
3226
3227         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3228                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3229                 r = link_drop_foreign_config(link);
3230                 if (r < 0)
3231                         return r;
3232         }
3233
3234         link_free_carrier_maps(link);
3235         link_free_engines(link);
3236         link->network = network_unref(link->network);
3237
3238         /* Then, apply new .network file */
3239         r = network_apply(network, link);
3240         if (r < 0)
3241                 return r;
3242
3243         r = link_new_carrier_maps(link);
3244         if (r < 0)
3245                 return r;
3246
3247         link_set_state(link, LINK_STATE_INITIALIZED);
3248         link_dirty(link);
3249
3250         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3251          * link_configure() is called later asynchronously. */
3252         r = link_configure_duid(link);
3253         if (r <= 0)
3254                 return r;
3255
3256         r = link_configure(link);
3257         if (r < 0)
3258                 return r;
3259
3260         return 0;
3261 }
3262
3263 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3264         int r;
3265
3266         r = link_reconfigure_internal(link, m, false);
3267         if (r < 0)
3268                 link_enter_failed(link);
3269
3270         return 1;
3271 }
3272
3273 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3274         int r;
3275
3276         r = link_reconfigure_internal(link, m, true);
3277         if (r < 0)
3278                 link_enter_failed(link);
3279
3280         return 1;
3281 }
3282
3283 int link_reconfigure(Link *link, bool force) {
3284         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3285         int r;
3286
3287         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3288                 return 0;
3289
3290         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3291                                      link->ifindex);
3292         if (r < 0)
3293                 return r;
3294
3295         r = netlink_call_async(link->manager->rtnl, NULL, req,
3296                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3297                                link_netlink_destroy_callback, link);
3298         if (r < 0)
3299                 return r;
3300
3301         link_ref(link);
3302
3303         return 0;
3304 }
3305
3306 static int link_initialized_and_synced(Link *link) {
3307         Network *network;
3308         int r;
3309
3310         assert(link);
3311         assert(link->ifname);
3312         assert(link->manager);
3313
3314         /* We may get called either from the asynchronous netlink callback,
3315          * or directly for link_add() if running in a container. See link_add(). */
3316         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3317                 return 0;
3318
3319         log_link_debug(link, "Link state is up-to-date");
3320         link_set_state(link, LINK_STATE_INITIALIZED);
3321
3322         r = link_new_bound_by_list(link);
3323         if (r < 0)
3324                 return r;
3325
3326         r = link_handle_bound_by_list(link);
3327         if (r < 0)
3328                 return r;
3329
3330         if (!link->network) {
3331                 r = wifi_get_info(link);
3332                 if (r < 0)
3333                         return r;
3334
3335                 r = network_get(link->manager, link->iftype, link->sd_device,
3336                                 link->ifname, link->alternative_names, link->driver,
3337                                 &link->mac, &link->permanent_mac,
3338                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3339                 if (r == -ENOENT) {
3340                         link_enter_unmanaged(link);
3341                         return 0;
3342                 } else if (r == 0 && network->unmanaged) {
3343                         link_enter_unmanaged(link);
3344                         return 0;
3345                 } else if (r < 0)
3346                         return r;
3347
3348                 if (link->flags & IFF_LOOPBACK) {
3349                         if (network->link_local != ADDRESS_FAMILY_NO)
3350                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3351
3352                         if (network->dhcp != ADDRESS_FAMILY_NO)
3353                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3354
3355                         if (network->dhcp_server)
3356                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3357                 }
3358
3359                 r = network_apply(network, link);
3360                 if (r < 0)
3361                         return r;
3362         }
3363
3364         r = link_new_bound_to_list(link);
3365         if (r < 0)
3366                 return r;
3367
3368         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3369          * link_configure() is called later asynchronously. */
3370         r = link_configure_duid(link);
3371         if (r <= 0)
3372                 return r;
3373
3374         r = link_configure(link);
3375         if (r < 0)
3376                 return r;
3377
3378         return 0;
3379 }
3380
3381 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3382         _cleanup_strv_free_ char **s = NULL;
3383         int r;
3384
3385         r = sd_netlink_message_get_errno(m);
3386         if (r < 0) {
3387                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3388                 link_enter_failed(link);
3389                 return 0;
3390         }
3391
3392         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3393         if (r < 0 && r != -ENODATA) {
3394                 link_enter_failed(link);
3395                 return 0;
3396         }
3397
3398         strv_free_and_replace(link->alternative_names, s);
3399
3400         r = link_initialized_and_synced(link);
3401         if (r < 0)
3402                 link_enter_failed(link);
3403         return 1;
3404 }
3405
3406 int link_initialized(Link *link, sd_device *device) {
3407         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3408         int r;
3409
3410         assert(link);
3411         assert(link->manager);
3412         assert(link->manager->rtnl);
3413         assert(device);
3414
3415         if (link->state != LINK_STATE_PENDING)
3416                 return 0;
3417
3418         if (link->sd_device)
3419                 return 0;
3420
3421         log_link_debug(link, "udev initialized link");
3422         link_set_state(link, LINK_STATE_INITIALIZED);
3423
3424         link->sd_device = sd_device_ref(device);
3425
3426         /* udev has initialized the link, but we don't know if we have yet
3427          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3428          * when it returns we know that the pending NEWLINKs have already been
3429          * processed and that we are up-to-date */
3430
3431         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3432                                      link->ifindex);
3433         if (r < 0)
3434                 return r;
3435
3436         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3437                                link_netlink_destroy_callback, link);
3438         if (r < 0)
3439                 return r;
3440
3441         link_ref(link);
3442
3443         return 0;
3444 }
3445
3446 static int link_load(Link *link) {
3447         _cleanup_free_ char *network_file = NULL,
3448                             *addresses = NULL,
3449                             *routes = NULL,
3450                             *dhcp4_address = NULL,
3451                             *ipv4ll_address = NULL;
3452         union in_addr_union address;
3453         int r;
3454
3455         assert(link);
3456
3457         r = parse_env_file(NULL, link->state_file,
3458                            "NETWORK_FILE", &network_file,
3459                            "ADDRESSES", &addresses,
3460                            "ROUTES", &routes,
3461                            "DHCP4_ADDRESS", &dhcp4_address,
3462                            "IPV4LL_ADDRESS", &ipv4ll_address);
3463         if (r < 0 && r != -ENOENT)
3464                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3465
3466         if (network_file) {
3467                 Network *network;
3468                 char *suffix;
3469
3470                 /* drop suffix */
3471                 suffix = strrchr(network_file, '.');
3472                 if (!suffix) {
3473                         log_link_debug(link, "Failed to get network name from %s", network_file);
3474                         goto network_file_fail;
3475                 }
3476                 *suffix = '\0';
3477
3478                 r = network_get_by_name(link->manager, basename(network_file), &network);
3479                 if (r < 0) {
3480                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3481                         goto network_file_fail;
3482                 }
3483
3484                 r = network_apply(network, link);
3485                 if (r < 0)
3486                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3487         }
3488
3489 network_file_fail:
3490
3491         for (const char *p = addresses; p; ) {
3492                 _cleanup_free_ char *address_str = NULL;
3493                 char *prefixlen_str;
3494                 int family;
3495                 unsigned char prefixlen;
3496
3497                 r = extract_first_word(&p, &address_str, NULL, 0);
3498                 if (r < 0)
3499                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3500                 if (r <= 0)
3501                         break;
3502
3503                 prefixlen_str = strchr(address_str, '/');
3504                 if (!prefixlen_str) {
3505                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3506                         continue;
3507                 }
3508                 *prefixlen_str++ = '\0';
3509
3510                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3511                 if (r != 1) {
3512                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3513                         continue;
3514                 }
3515
3516                 r = in_addr_from_string_auto(address_str, &family, &address);
3517                 if (r < 0) {
3518                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3519                         continue;
3520                 }
3521
3522                 r = address_add(link, family, &address, prefixlen, NULL);
3523                 if (r < 0)
3524                         return log_link_error_errno(link, r, "Failed to add address: %m");
3525         }
3526
3527         for (const char *p = routes; p; ) {
3528                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3529                 _cleanup_(route_freep) Route *tmp = NULL;
3530                 _cleanup_free_ char *route_str = NULL;
3531                 char *prefixlen_str;
3532                 Route *route;
3533
3534                 r = extract_first_word(&p, &route_str, NULL, 0);
3535                 if (r < 0)
3536                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3537                 if (r <= 0)
3538                         break;
3539
3540                 prefixlen_str = strchr(route_str, '/');
3541                 if (!prefixlen_str) {
3542                         log_link_debug(link, "Failed to parse route %s", route_str);
3543                         continue;
3544                 }
3545                 *prefixlen_str++ = '\0';
3546
3547                 r = route_new(&tmp);
3548                 if (r < 0)
3549                         return log_oom();
3550
3551                 r = sscanf(prefixlen_str,
3552                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3553                            &tmp->dst_prefixlen,
3554                            &tmp->tos,
3555                            &tmp->priority,
3556                            &tmp->table,
3557                            &tmp->lifetime);
3558                 if (r != 5) {
3559                         log_link_debug(link,
3560                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3561                                        prefixlen_str);
3562                         continue;
3563                 }
3564
3565                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3566                 if (r < 0) {
3567                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3568                         continue;
3569                 }
3570
3571                 r = route_add(link, tmp, &route);
3572                 if (r < 0)
3573                         return log_link_error_errno(link, r, "Failed to add route: %m");
3574
3575                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3576                         r = sd_event_add_time(link->manager->event, &expire,
3577                                               clock_boottime_or_monotonic(),
3578                                               route->lifetime, 0, route_expire_handler, route);
3579                         if (r < 0)
3580                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3581                 }
3582
3583                 sd_event_source_unref(route->expire);
3584                 route->expire = TAKE_PTR(expire);
3585         }
3586
3587         if (dhcp4_address) {
3588                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3589                 if (r < 0) {
3590                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3591                         goto dhcp4_address_fail;
3592                 }
3593
3594                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3595                 if (r < 0)
3596                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3597
3598                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3599                 if (r < 0)
3600                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3601
3602                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3603                 if (r < 0)
3604                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3605         }
3606
3607 dhcp4_address_fail:
3608
3609         if (ipv4ll_address) {
3610                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3611                 if (r < 0) {
3612                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3613                         goto ipv4ll_address_fail;
3614                 }
3615
3616                 r = sd_ipv4ll_new(&link->ipv4ll);
3617                 if (r < 0)
3618                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3619
3620                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3621                 if (r < 0)
3622                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3623
3624                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3625                 if (r < 0)
3626                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3627         }
3628
3629 ipv4ll_address_fail:
3630
3631         return 0;
3632 }
3633
3634 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3635         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3636         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3637         Link *link;
3638         int r;
3639
3640         assert(m);
3641         assert(m->rtnl);
3642         assert(message);
3643         assert(ret);
3644
3645         r = link_new(m, message, ret);
3646         if (r < 0)
3647                 return r;
3648
3649         link = *ret;
3650
3651         log_link_debug(link, "Link %d added", link->ifindex);
3652
3653         r = link_load(link);
3654         if (r < 0)
3655                 return r;
3656
3657         if (path_is_read_only_fs("/sys") <= 0) {
3658                 /* udev should be around */
3659                 sprintf(ifindex_str, "n%d", link->ifindex);
3660                 r = sd_device_new_from_device_id(&device, ifindex_str);
3661                 if (r < 0) {
3662                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3663                         return 0;
3664                 }
3665
3666                 r = sd_device_get_is_initialized(device);
3667                 if (r < 0) {
3668                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3669                         goto failed;
3670                 }
3671                 if (r == 0) {
3672                         /* not yet ready */
3673                         log_link_debug(link, "link pending udev initialization...");
3674                         return 0;
3675                 }
3676
3677                 r = device_is_renaming(device);
3678                 if (r < 0) {
3679                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3680                         goto failed;
3681                 }
3682                 if (r > 0) {
3683                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3684                         return 0;
3685                 }
3686
3687                 r = link_initialized(link, device);
3688                 if (r < 0)
3689                         goto failed;
3690         } else {
3691                 r = link_initialized_and_synced(link);
3692                 if (r < 0)
3693                         goto failed;
3694         }
3695
3696         return 0;
3697 failed:
3698         link_enter_failed(link);
3699         return r;
3700 }
3701
3702 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3703         int r;
3704
3705         assert(link);
3706
3707         log_link_info(link, "Gained IPv6LL");
3708
3709         link->ipv6ll_address = *address;
3710         link_check_ready(link);
3711
3712         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3713                 r = link_acquire_ipv6_conf(link);
3714                 if (r < 0) {
3715                         link_enter_failed(link);
3716                         return r;
3717                 }
3718         }
3719
3720         return 0;
3721 }
3722
3723 static int link_carrier_gained(Link *link) {
3724         int r;
3725
3726         assert(link);
3727
3728         r = wifi_get_info(link);
3729         if (r < 0)
3730                 return r;
3731         if (r > 0) {
3732                 r = link_reconfigure_internal(link, NULL, false);
3733                 if (r < 0) {
3734                         link_enter_failed(link);
3735                         return r;
3736                 }
3737         }
3738
3739         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3740                 r = link_acquire_conf(link);
3741                 if (r < 0) {
3742                         link_enter_failed(link);
3743                         return r;
3744                 }
3745
3746                 link_set_state(link, LINK_STATE_CONFIGURING);
3747                 r = link_request_set_addresses(link);
3748                 if (r < 0)
3749                         return r;
3750         }
3751
3752         r = link_handle_bound_by_list(link);
3753         if (r < 0)
3754                 return r;
3755
3756         return 0;
3757 }
3758
3759 static int link_carrier_lost(Link *link) {
3760         int r;
3761
3762         assert(link);
3763
3764         if (link->network && link->network->ignore_carrier_loss)
3765                 return 0;
3766
3767         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3768          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3769          * configuration and stop the clients as well. */
3770         if (link->setting_mtu)
3771                 return 0;
3772
3773         r = link_stop_clients(link, false);
3774         if (r < 0) {
3775                 link_enter_failed(link);
3776                 return r;
3777         }
3778
3779         if (link_dhcp4_server_enabled(link))
3780                 (void) sd_dhcp_server_stop(link->dhcp_server);
3781
3782         r = link_drop_config(link);
3783         if (r < 0)
3784                 return r;
3785
3786         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3787                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3788                 r = link_drop_foreign_config(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 int link_carrier_reset(Link *link) {
3801         int r;
3802
3803         assert(link);
3804
3805         if (link_has_carrier(link)) {
3806                 r = link_carrier_lost(link);
3807                 if (r < 0)
3808                         return r;
3809
3810                 r = link_carrier_gained(link);
3811                 if (r < 0)
3812                         return r;
3813
3814                 log_link_info(link, "Reset carrier");
3815         }
3816
3817         return 0;
3818 }
3819
3820 /* This is called every time an interface admin state changes to up;
3821  * specifically, when IFF_UP flag changes from unset to set */
3822 static int link_admin_state_up(Link *link) {
3823         int r;
3824
3825         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3826          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3827          * ipv6_mtu_set prevents this from trying to set it too early before
3828          * the link->network has been setup; we only need to reset it
3829          * here if we've already set it during normal initialization. */
3830         if (link->ipv6_mtu_set) {
3831                 r = link_set_ipv6_mtu(link);
3832                 if (r < 0)
3833                         return r;
3834         }
3835
3836         return 0;
3837 }
3838
3839 int link_update(Link *link, sd_netlink_message *m) {
3840         _cleanup_strv_free_ char **s = NULL;
3841         struct ether_addr mac;
3842         const char *ifname;
3843         uint32_t mtu;
3844         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3845         int old_master, r;
3846
3847         assert(link);
3848         assert(link->ifname);
3849         assert(m);
3850
3851         if (link->state == LINK_STATE_LINGER) {
3852                 log_link_info(link, "Link re-added");
3853                 link_set_state(link, LINK_STATE_CONFIGURING);
3854
3855                 r = link_new_carrier_maps(link);
3856                 if (r < 0)
3857                         return r;
3858         }
3859
3860         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3861         if (r >= 0 && !streq(ifname, link->ifname)) {
3862                 Manager *manager = link->manager;
3863
3864                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3865
3866                 link_drop(link);
3867                 r = link_add(manager, m, &link);
3868                 if (r < 0)
3869                         return r;
3870         }
3871
3872         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3873         if (r >= 0)
3874                 strv_free_and_replace(link->alternative_names, s);
3875
3876         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3877         if (r >= 0 && mtu > 0) {
3878                 link->mtu = mtu;
3879                 if (link->original_mtu == 0) {
3880                         link->original_mtu = mtu;
3881                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3882                 }
3883
3884                 if (link->dhcp_client) {
3885                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3886                                                    link->mtu);
3887                         if (r < 0)
3888                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3889                 }
3890
3891                 if (link->radv) {
3892                         r = sd_radv_set_mtu(link->radv, link->mtu);
3893                         if (r < 0)
3894                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3895                 }
3896         }
3897
3898         /* The kernel may broadcast NEWLINK messages without the MAC address
3899            set, simply ignore them. */
3900         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3901         if (r >= 0) {
3902                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3903                            ETH_ALEN)) {
3904
3905                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3906                                ETH_ALEN);
3907
3908                         log_link_debug(link, "MAC address: "
3909                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3910                                        mac.ether_addr_octet[0],
3911                                        mac.ether_addr_octet[1],
3912                                        mac.ether_addr_octet[2],
3913                                        mac.ether_addr_octet[3],
3914                                        mac.ether_addr_octet[4],
3915                                        mac.ether_addr_octet[5]);
3916
3917                         if (link->ipv4ll) {
3918                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3919                                 if (r < 0)
3920                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3921                         }
3922
3923                         if (link->dhcp_client) {
3924                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3925                                                            (const uint8_t *) &link->mac,
3926                                                            sizeof (link->mac),
3927                                                            ARPHRD_ETHER);
3928                                 if (r < 0)
3929                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3930
3931                                 r = dhcp4_set_client_identifier(link);
3932                                 if (r < 0)
3933                                         return r;
3934                         }
3935
3936                         if (link->dhcp6_client) {
3937                                 const DUID* duid = link_get_duid(link);
3938
3939                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3940                                                             (const uint8_t *) &link->mac,
3941                                                             sizeof (link->mac),
3942                                                             ARPHRD_ETHER);
3943                                 if (r < 0)
3944                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3945
3946                                 if (link->network->iaid_set) {
3947                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3948                                                                      link->network->iaid);
3949                                         if (r < 0)
3950                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3951                                 }
3952
3953                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3954                                                              duid->type,
3955                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3956                                                              duid->raw_data_len);
3957                                 if (r < 0)
3958                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3959                         }
3960
3961                         if (link->radv) {
3962                                 r = sd_radv_set_mac(link->radv, &link->mac);
3963                                 if (r < 0)
3964                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3965                         }
3966
3967                         if (link->ndisc) {
3968                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3969                                 if (r < 0)
3970                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3971                         }
3972                 }
3973         }
3974
3975         old_master = link->master_ifindex;
3976         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3977
3978         link_was_admin_up = link->flags & IFF_UP;
3979         had_carrier = link_has_carrier(link);
3980
3981         r = link_update_flags(link, m, old_master != link->master_ifindex);
3982         if (r < 0)
3983                 return r;
3984
3985         if (!link_was_admin_up && (link->flags & IFF_UP)) {
3986                 log_link_info(link, "Link UP");
3987
3988                 r = link_admin_state_up(link);
3989                 if (r < 0)
3990                         return r;
3991         } else if (link_was_admin_up && !(link->flags & IFF_UP))
3992                 log_link_info(link, "Link DOWN");
3993
3994         r = link_update_lldp(link);
3995         if (r < 0)
3996                 return r;
3997
3998         carrier_gained = !had_carrier && link_has_carrier(link);
3999         carrier_lost = had_carrier && !link_has_carrier(link);
4000
4001         if (carrier_gained) {
4002                 log_link_info(link, "Gained carrier");
4003
4004                 r = link_carrier_gained(link);
4005                 if (r < 0)
4006                         return r;
4007         } else if (carrier_lost) {
4008                 log_link_info(link, "Lost carrier");
4009
4010                 r = link_carrier_lost(link);
4011                 if (r < 0)
4012                         return r;
4013         }
4014
4015         return 0;
4016 }
4017
4018 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4019         bool space = false;
4020         Iterator i;
4021         Link *link;
4022
4023         assert(f);
4024         assert(prefix);
4025
4026         if (hashmap_isempty(h))
4027                 return;
4028
4029         fputs(prefix, f);
4030         HASHMAP_FOREACH(link, h, i) {
4031                 if (space)
4032                         fputc(' ', f);
4033
4034                 fprintf(f, "%i", link->ifindex);
4035                 space = true;
4036         }
4037
4038         fputc('\n', f);
4039 }
4040
4041 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4042         for (unsigned j = 0; j < n_dns; j++) {
4043                 _cleanup_free_ char *b = NULL;
4044                 int r;
4045
4046                 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4047                 if (r < 0) {
4048                         log_debug_errno(r, "Failed to format address, ignoring: %m");
4049                         continue;
4050                 }
4051
4052                 if (*space)
4053                         fputc(' ', f);
4054                 fputs(b, f);
4055                 *space = true;
4056         }
4057 }
4058
4059 static void serialize_addresses(
4060                 FILE *f,
4061                 const char *lvalue,
4062                 bool *space,
4063                 char **addresses,
4064                 sd_dhcp_lease *lease,
4065                 bool conditional,
4066                 sd_dhcp_lease_server_type what,
4067                 sd_dhcp6_lease *lease6,
4068                 bool conditional6,
4069                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4070                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4071         int r;
4072
4073         bool _space = false;
4074         if (!space)
4075                 space = &_space;
4076
4077         if (lvalue)
4078                 fprintf(f, "%s=", lvalue);
4079         fputstrv(f, addresses, NULL, space);
4080
4081         if (lease && conditional) {
4082                 const struct in_addr *lease_addresses;
4083
4084                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4085                 if (r > 0)
4086                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4087         }
4088
4089         if (lease6 && conditional6 && lease6_get_addr) {
4090                 const struct in6_addr *in6_addrs;
4091
4092                 r = lease6_get_addr(lease6, &in6_addrs);
4093                 if (r > 0)
4094                         serialize_in6_addrs(f, in6_addrs, r, space);
4095         }
4096
4097         if (lease6 && conditional6 && lease6_get_fqdn) {
4098                 char **in6_hosts;
4099
4100                 r = lease6_get_fqdn(lease6, &in6_hosts);
4101                 if (r > 0)
4102                         fputstrv(f, in6_hosts, NULL, space);
4103         }
4104
4105         if (lvalue)
4106                 fputc('\n', f);
4107 }
4108
4109 int link_save(Link *link) {
4110         const char *admin_state, *oper_state, *carrier_state, *address_state;
4111         _cleanup_free_ char *temp_path = NULL;
4112         _cleanup_fclose_ FILE *f = NULL;
4113         Route *route;
4114         Address *a;
4115         Iterator i;
4116         int r;
4117
4118         assert(link);
4119         assert(link->state_file);
4120         assert(link->lease_file);
4121         assert(link->manager);
4122
4123         if (link->state == LINK_STATE_LINGER) {
4124                 (void) unlink(link->state_file);
4125                 return 0;
4126         }
4127
4128         link_lldp_save(link);
4129
4130         admin_state = link_state_to_string(link->state);
4131         assert(admin_state);
4132
4133         oper_state = link_operstate_to_string(link->operstate);
4134         assert(oper_state);
4135
4136         carrier_state = link_carrier_state_to_string(link->carrier_state);
4137         assert(carrier_state);
4138
4139         address_state = link_address_state_to_string(link->address_state);
4140         assert(address_state);
4141
4142         r = fopen_temporary(link->state_file, &f, &temp_path);
4143         if (r < 0)
4144                 goto fail;
4145
4146         (void) fchmod(fileno(f), 0644);
4147
4148         fprintf(f,
4149                 "# This is private data. Do not parse.\n"
4150                 "ADMIN_STATE=%s\n"
4151                 "OPER_STATE=%s\n"
4152                 "CARRIER_STATE=%s\n"
4153                 "ADDRESS_STATE=%s\n",
4154                 admin_state, oper_state, carrier_state, address_state);
4155
4156         if (link->network) {
4157                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4158                 const char *dhcp_domainname = NULL, *p;
4159                 sd_dhcp6_lease *dhcp6_lease = NULL;
4160                 bool space;
4161
4162                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4163                         yes_no(link->network->required_for_online));
4164
4165                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4166                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4167                         strempty(link_operstate_to_string(st.min)),
4168                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4169                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4170
4171                 if (link->dhcp6_client) {
4172                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4173                         if (r < 0 && r != -ENOMSG)
4174                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4175                 }
4176
4177                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4178
4179                 /************************************************************/
4180
4181                 fputs("DNS=", f);
4182                 space = false;
4183                 if (link->n_dns != (unsigned) -1)
4184                         link_save_dns(f, link->dns, link->n_dns, &space);
4185                 else
4186                         link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4187
4188                 serialize_addresses(f, NULL, &space,
4189                                     NULL,
4190                                     link->dhcp_lease,
4191                                     link->network->dhcp_use_dns,
4192                                     SD_DHCP_LEASE_DNS,
4193                                     dhcp6_lease,
4194                                     link->network->dhcp6_use_dns,
4195                                     sd_dhcp6_lease_get_dns,
4196                                     NULL);
4197
4198                 /* Make sure to flush out old entries before we use the NDISC data */
4199                 ndisc_vacuum(link);
4200
4201                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4202                         NDiscRDNSS *dd;
4203
4204                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4205                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4206                 }
4207
4208                 fputc('\n', f);
4209
4210                 /************************************************************/
4211
4212                 serialize_addresses(f, "NTP", NULL,
4213                                     link->ntp ?: link->network->ntp,
4214                                     link->dhcp_lease,
4215                                     link->network->dhcp_use_ntp,
4216                                     SD_DHCP_LEASE_NTP,
4217                                     dhcp6_lease,
4218                                     link->network->dhcp6_use_ntp,
4219                                     sd_dhcp6_lease_get_ntp_addrs,
4220                                     sd_dhcp6_lease_get_ntp_fqdn);
4221
4222                 serialize_addresses(f, "SIP", NULL,
4223                                     NULL,
4224                                     link->dhcp_lease,
4225                                     link->network->dhcp_use_sip,
4226                                     SD_DHCP_LEASE_SIP,
4227                                     NULL, false, NULL, NULL);
4228
4229                 /************************************************************/
4230
4231                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4232                         if (link->dhcp_lease) {
4233                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4234                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4235                         }
4236                         if (dhcp6_lease)
4237                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4238                 }
4239
4240                 fputs("DOMAINS=", f);
4241                 space = false;
4242                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4243                         fputs_with_space(f, p, NULL, &space);
4244
4245                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4246                         if (dhcp_domainname)
4247                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4248                         if (dhcp_domains)
4249                                 fputstrv(f, dhcp_domains, NULL, &space);
4250                         if (dhcp6_domains)
4251                                 fputstrv(f, dhcp6_domains, NULL, &space);
4252                 }
4253
4254                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4255                         NDiscDNSSL *dd;
4256
4257                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4258                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4259                 }
4260
4261                 fputc('\n', f);
4262
4263                 /************************************************************/
4264
4265                 fputs("ROUTE_DOMAINS=", f);
4266                 space = false;
4267                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4268                         fputs_with_space(f, p, NULL, &space);
4269
4270                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4271                         if (dhcp_domainname)
4272                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4273                         if (dhcp_domains)
4274                                 fputstrv(f, dhcp_domains, NULL, &space);
4275                         if (dhcp6_domains)
4276                                 fputstrv(f, dhcp6_domains, NULL, &space);
4277                 }
4278
4279                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4280                         NDiscDNSSL *dd;
4281
4282                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4283                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4284                 }
4285
4286                 fputc('\n', f);
4287
4288                 /************************************************************/
4289
4290                 fprintf(f, "LLMNR=%s\n",
4291                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4292
4293                 /************************************************************/
4294
4295                 fprintf(f, "MDNS=%s\n",
4296                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4297
4298                 /************************************************************/
4299
4300                 int dns_default_route =
4301                         link->dns_default_route >= 0 ? link->dns_default_route :
4302                         link->network->dns_default_route;
4303                 if (dns_default_route >= 0)
4304                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4305
4306                 /************************************************************/
4307
4308                 DnsOverTlsMode dns_over_tls_mode =
4309                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4310                         link->network->dns_over_tls_mode;
4311                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4312                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4313
4314                 /************************************************************/
4315
4316                 DnssecMode dnssec_mode =
4317                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4318                         link->network->dnssec_mode;
4319                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4320                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4321
4322                 /************************************************************/
4323
4324                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4325                 if (set_isempty(nta_anchors))
4326                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4327
4328                 if (!set_isempty(nta_anchors)) {
4329                         const char *n;
4330
4331                         fputs("DNSSEC_NTA=", f);
4332                         space = false;
4333                         SET_FOREACH(n, nta_anchors, i)
4334                                 fputs_with_space(f, n, NULL, &space);
4335                         fputc('\n', f);
4336                 }
4337
4338                 /************************************************************/
4339
4340                 fputs("ADDRESSES=", f);
4341                 space = false;
4342                 SET_FOREACH(a, link->addresses, i) {
4343                         _cleanup_free_ char *address_str = NULL;
4344
4345                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4346                         if (r < 0)
4347                                 goto fail;
4348
4349                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4350                         space = true;
4351                 }
4352                 fputc('\n', f);
4353
4354                 /************************************************************/
4355
4356                 fputs("ROUTES=", f);
4357                 space = false;
4358                 SET_FOREACH(route, link->routes, i) {
4359                         _cleanup_free_ char *route_str = NULL;
4360
4361                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4362                         if (r < 0)
4363                                 goto fail;
4364
4365                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4366                                 space ? " " : "", route_str,
4367                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4368                         space = true;
4369                 }
4370
4371                 fputc('\n', f);
4372         }
4373
4374         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4375         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4376
4377         if (link->dhcp_lease) {
4378                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4379                 if (r < 0)
4380                         goto fail;
4381
4382                 fprintf(f,
4383                         "DHCP_LEASE=%s\n",
4384                         link->lease_file);
4385         } else
4386                 (void) unlink(link->lease_file);
4387
4388         if (link->ipv4ll) {
4389                 struct in_addr address;
4390
4391                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4392                 if (r >= 0) {
4393                         fputs("IPV4LL_ADDRESS=", f);
4394                         serialize_in_addrs(f, &address, 1, false, NULL);
4395                         fputc('\n', f);
4396                 }
4397         }
4398
4399         if (link->dhcp6_client) {
4400                 _cleanup_free_ char *duid = NULL;
4401                 uint32_t iaid;
4402
4403                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4404                 if (r >= 0)
4405                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4406
4407                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4408                 if (r >= 0)
4409                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4410         }
4411
4412         r = fflush_and_check(f);
4413         if (r < 0)
4414                 goto fail;
4415
4416         if (rename(temp_path, link->state_file) < 0) {
4417                 r = -errno;
4418                 goto fail;
4419         }
4420
4421         return 0;
4422
4423 fail:
4424         (void) unlink(link->state_file);
4425         if (temp_path)
4426                 (void) unlink(temp_path);
4427
4428         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4429 }
4430
4431 /* The serialized state in /run is no longer up-to-date. */
4432 void link_dirty(Link *link) {
4433         int r;
4434
4435         assert(link);
4436
4437         /* mark manager dirty as link is dirty */
4438         manager_dirty(link->manager);
4439
4440         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4441         if (r <= 0)
4442                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4443                 return;
4444         link_ref(link);
4445 }
4446
4447 /* The serialized state in /run is up-to-date */
4448 void link_clean(Link *link) {
4449         assert(link);
4450         assert(link->manager);
4451
4452         link_unref(set_remove(link->manager->dirty_links, link));
4453 }
4454
4455 static const char* const link_state_table[_LINK_STATE_MAX] = {
4456         [LINK_STATE_PENDING] = "pending",
4457         [LINK_STATE_INITIALIZED] = "initialized",
4458         [LINK_STATE_CONFIGURING] = "configuring",
4459         [LINK_STATE_CONFIGURED] = "configured",
4460         [LINK_STATE_UNMANAGED] = "unmanaged",
4461         [LINK_STATE_FAILED] = "failed",
4462         [LINK_STATE_LINGER] = "linger",
4463 };
4464
4465 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4466
4467 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4468         const char *err_msg = NULL;
4469
4470         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4471         return log_link_full(link, level, err,
4472                              "%s: %s%s%s%m",
4473                              msg,
4474                              strempty(err_msg),
4475                              err_msg && !endswith(err_msg, ".") ? "." : "",
4476                              err_msg ? " " : "");
4477 }