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 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) && link->network->dhcp6_without_ra) {
1568                 assert(link->dhcp6_client);
1569                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1570
1571                 r = dhcp6_request_address(link, true);
1572                 if (r < 0 && r != -EBUSY)
1573                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1574                 else
1575                         log_link_debug(link, "Acquiring DHCPv6 lease");
1576         }
1577
1578         (void) dhcp6_request_prefix_delegation(link);
1579
1580         return 0;
1581 }
1582
1583 static int link_acquire_ipv4_conf(Link *link) {
1584         int r;
1585
1586         assert(link);
1587         assert(link->manager);
1588         assert(link->manager->event);
1589
1590         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1591                 assert(link->ipv4ll);
1592
1593                 log_link_debug(link, "Acquiring IPv4 link-local address");
1594
1595                 r = sd_ipv4ll_start(link->ipv4ll);
1596                 if (r < 0)
1597                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1598         }
1599
1600         if (link_dhcp4_enabled(link)) {
1601                 assert(link->dhcp_client);
1602
1603                 log_link_debug(link, "Acquiring DHCPv4 lease");
1604
1605                 r = sd_dhcp_client_start(link->dhcp_client);
1606                 if (r < 0)
1607                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1608         }
1609
1610         return 0;
1611 }
1612
1613 static int link_acquire_conf(Link *link) {
1614         int r;
1615
1616         assert(link);
1617
1618         r = link_acquire_ipv4_conf(link);
1619         if (r < 0)
1620                 return r;
1621
1622         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1623                 r = link_acquire_ipv6_conf(link);
1624                 if (r < 0)
1625                         return r;
1626         }
1627
1628         if (link_lldp_emit_enabled(link)) {
1629                 r = link_lldp_emit_start(link);
1630                 if (r < 0)
1631                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1632         }
1633
1634         return 0;
1635 }
1636
1637 bool link_has_carrier(Link *link) {
1638         /* see Documentation/networking/operstates.txt in the kernel sources */
1639
1640         if (link->kernel_operstate == IF_OPER_UP)
1641                 return true;
1642
1643         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1644                 /* operstate may not be implemented, so fall back to flags */
1645                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1646                     !FLAGS_SET(link->flags, IFF_DORMANT))
1647                         return true;
1648
1649         return false;
1650 }
1651
1652 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1653         int r;
1654
1655         assert(link);
1656
1657         link->setting_genmode = false;
1658
1659         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1660                 return 1;
1661
1662         r = sd_netlink_message_get_errno(m);
1663         if (r < 0)
1664                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1665         else
1666                 log_link_debug(link, "Setting address genmode done.");
1667
1668         if (link->state == LINK_STATE_INITIALIZED) {
1669                 r = link_configure_continue(link);
1670                 if (r < 0)
1671                         link_enter_failed(link);
1672         }
1673
1674         return 1;
1675 }
1676
1677 static int link_configure_addrgen_mode(Link *link) {
1678         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1679         uint8_t ipv6ll_mode;
1680         int r;
1681
1682         assert(link);
1683         assert(link->network);
1684         assert(link->manager);
1685         assert(link->manager->rtnl);
1686
1687         if (!socket_ipv6_is_supported() || link->setting_genmode)
1688                 return 0;
1689
1690         log_link_debug(link, "Setting address genmode for link");
1691
1692         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1693         if (r < 0)
1694                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1695
1696         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1697         if (r < 0)
1698                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1699
1700         r = sd_netlink_message_open_container(req, AF_INET6);
1701         if (r < 0)
1702                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1703
1704         if (!link_ipv6ll_enabled(link))
1705                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1706         else if (link->network->ipv6ll_address_gen_mode < 0) {
1707                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1708                 if (r < 0) {
1709                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1710                          * reading the file fails with EIO. */
1711                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1712
1713                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1714                 } else
1715                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1716         } else
1717                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1718
1719         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1720         if (r < 0)
1721                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1722
1723         r = sd_netlink_message_close_container(req);
1724         if (r < 0)
1725                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1726
1727         r = sd_netlink_message_close_container(req);
1728         if (r < 0)
1729                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1730
1731         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1732                                link_netlink_destroy_callback, link);
1733         if (r < 0)
1734                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1735
1736         link_ref(link);
1737         link->setting_genmode = true;
1738
1739         return 0;
1740 }
1741
1742 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1743         int r;
1744
1745         assert(link);
1746
1747         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1748                 return 1;
1749
1750         r = sd_netlink_message_get_errno(m);
1751         if (r < 0)
1752                 /* we warn but don't fail the link, as it may be brought up later */
1753                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1754
1755         return 1;
1756 }
1757
1758 static int link_up(Link *link) {
1759         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1760         int r;
1761
1762         assert(link);
1763         assert(link->network);
1764         assert(link->manager);
1765         assert(link->manager->rtnl);
1766
1767         log_link_debug(link, "Bringing link up");
1768
1769         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1770         if (r < 0)
1771                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1772
1773         /* set it free if not enslaved with networkd */
1774         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1775                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1776                 if (r < 0)
1777                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1778         }
1779
1780         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1781         if (r < 0)
1782                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1783
1784         if (link->network->mac) {
1785                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1786                 if (r < 0)
1787                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1788         }
1789
1790         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1791                                link_netlink_destroy_callback, link);
1792         if (r < 0)
1793                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1794
1795         link_ref(link);
1796
1797         return 0;
1798 }
1799
1800 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1801         int r;
1802
1803         assert(link);
1804
1805         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1806                 return 1;
1807
1808         r = sd_netlink_message_get_errno(m);
1809         if (r < 0)
1810                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1811
1812         return 1;
1813 }
1814
1815 int link_down(Link *link, link_netlink_message_handler_t callback) {
1816         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1817         int r;
1818
1819         assert(link);
1820         assert(link->manager);
1821         assert(link->manager->rtnl);
1822
1823         log_link_debug(link, "Bringing link down");
1824
1825         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1826                                      RTM_SETLINK, link->ifindex);
1827         if (r < 0)
1828                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1829
1830         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1831         if (r < 0)
1832                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1833
1834         r = netlink_call_async(link->manager->rtnl, NULL, req,
1835                                callback ?: link_down_handler,
1836                                link_netlink_destroy_callback, link);
1837         if (r < 0)
1838                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1839
1840         link_ref(link);
1841
1842         return 0;
1843 }
1844
1845 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1846         int r;
1847
1848         assert(link);
1849
1850         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1851                 return 1;
1852
1853         r = sd_netlink_message_get_errno(m);
1854         if (r < 0)
1855                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1856
1857         return 1;
1858 }
1859
1860 static int link_set_group(Link *link) {
1861         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1862         int r;
1863
1864         assert(link);
1865         assert(link->network);
1866         assert(link->manager);
1867         assert(link->manager->rtnl);
1868
1869         if (link->network->group <= 0)
1870                 return 0;
1871
1872         log_link_debug(link, "Setting group");
1873
1874         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1875         if (r < 0)
1876                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1877
1878         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1879         if (r < 0)
1880                 return log_link_error_errno(link, r, "Could not set link group: %m");
1881
1882         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1883                                link_netlink_destroy_callback, link);
1884         if (r < 0)
1885                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1886
1887         link_ref(link);
1888
1889         return 0;
1890 }
1891
1892 static int link_handle_bound_to_list(Link *link) {
1893         Link *l;
1894         Iterator i;
1895         int r;
1896         bool required_up = false;
1897         bool link_is_up = false;
1898
1899         assert(link);
1900
1901         if (hashmap_isempty(link->bound_to_links))
1902                 return 0;
1903
1904         if (link->flags & IFF_UP)
1905                 link_is_up = true;
1906
1907         HASHMAP_FOREACH (l, link->bound_to_links, i)
1908                 if (link_has_carrier(l)) {
1909                         required_up = true;
1910                         break;
1911                 }
1912
1913         if (!required_up && link_is_up) {
1914                 r = link_down(link, NULL);
1915                 if (r < 0)
1916                         return r;
1917         } else if (required_up && !link_is_up) {
1918                 r = link_up(link);
1919                 if (r < 0)
1920                         return r;
1921         }
1922
1923         return 0;
1924 }
1925
1926 static int link_handle_bound_by_list(Link *link) {
1927         Iterator i;
1928         Link *l;
1929         int r;
1930
1931         assert(link);
1932
1933         if (hashmap_isempty(link->bound_by_links))
1934                 return 0;
1935
1936         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1937                 r = link_handle_bound_to_list(l);
1938                 if (r < 0)
1939                         return r;
1940         }
1941
1942         return 0;
1943 }
1944
1945 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1946         int r;
1947
1948         assert(link);
1949         assert(carrier);
1950
1951         if (link == carrier)
1952                 return 0;
1953
1954         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1955                 return 0;
1956
1957         r = hashmap_ensure_allocated(h, NULL);
1958         if (r < 0)
1959                 return r;
1960
1961         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1962         if (r < 0)
1963                 return r;
1964
1965         return 0;
1966 }
1967
1968 static int link_new_bound_by_list(Link *link) {
1969         Manager *m;
1970         Link *carrier;
1971         Iterator i;
1972         int r;
1973         bool list_updated = false;
1974
1975         assert(link);
1976         assert(link->manager);
1977
1978         m = link->manager;
1979
1980         HASHMAP_FOREACH(carrier, m->links, i) {
1981                 if (!carrier->network)
1982                         continue;
1983
1984                 if (strv_isempty(carrier->network->bind_carrier))
1985                         continue;
1986
1987                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
1988                         r = link_put_carrier(link, carrier, &link->bound_by_links);
1989                         if (r < 0)
1990                                 return r;
1991
1992                         list_updated = true;
1993                 }
1994         }
1995
1996         if (list_updated)
1997                 link_dirty(link);
1998
1999         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2000                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2001                 if (r < 0)
2002                         return r;
2003
2004                 link_dirty(carrier);
2005         }
2006
2007         return 0;
2008 }
2009
2010 static int link_new_bound_to_list(Link *link) {
2011         Manager *m;
2012         Link *carrier;
2013         Iterator i;
2014         int r;
2015         bool list_updated = false;
2016
2017         assert(link);
2018         assert(link->manager);
2019
2020         if (!link->network)
2021                 return 0;
2022
2023         if (strv_isempty(link->network->bind_carrier))
2024                 return 0;
2025
2026         m = link->manager;
2027
2028         HASHMAP_FOREACH (carrier, m->links, i) {
2029                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2030                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2031                         if (r < 0)
2032                                 return r;
2033
2034                         list_updated = true;
2035                 }
2036         }
2037
2038         if (list_updated)
2039                 link_dirty(link);
2040
2041         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2042                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2043                 if (r < 0)
2044                         return r;
2045
2046                 link_dirty(carrier);
2047         }
2048
2049         return 0;
2050 }
2051
2052 static int link_new_carrier_maps(Link *link) {
2053         int r;
2054
2055         r = link_new_bound_by_list(link);
2056         if (r < 0)
2057                 return r;
2058
2059         r = link_handle_bound_by_list(link);
2060         if (r < 0)
2061                 return r;
2062
2063         r = link_new_bound_to_list(link);
2064         if (r < 0)
2065                 return r;
2066
2067         r = link_handle_bound_to_list(link);
2068         if (r < 0)
2069                 return r;
2070
2071         return 0;
2072 }
2073
2074 static void link_free_bound_to_list(Link *link) {
2075         Link *bound_to;
2076         Iterator i;
2077
2078         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2079                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2080
2081                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2082                         link_dirty(bound_to);
2083         }
2084
2085         return;
2086 }
2087
2088 static void link_free_bound_by_list(Link *link) {
2089         Link *bound_by;
2090         Iterator i;
2091
2092         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2093                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2094
2095                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2096                         link_dirty(bound_by);
2097                         link_handle_bound_to_list(bound_by);
2098                 }
2099         }
2100
2101         return;
2102 }
2103
2104 static void link_free_carrier_maps(Link *link) {
2105         bool list_updated = false;
2106
2107         assert(link);
2108
2109         if (!hashmap_isempty(link->bound_to_links)) {
2110                 link_free_bound_to_list(link);
2111                 list_updated = true;
2112         }
2113
2114         if (!hashmap_isempty(link->bound_by_links)) {
2115                 link_free_bound_by_list(link);
2116                 list_updated = true;
2117         }
2118
2119         if (list_updated)
2120                 link_dirty(link);
2121
2122         return;
2123 }
2124
2125 static int link_append_to_master(Link *link, NetDev *netdev) {
2126         Link *master;
2127         int r;
2128
2129         assert(link);
2130         assert(netdev);
2131
2132         r = link_get(link->manager, netdev->ifindex, &master);
2133         if (r < 0)
2134                 return r;
2135
2136         r = set_ensure_put(&master->slaves, NULL, link);
2137         if (r <= 0)
2138                 return r;
2139
2140         link_ref(link);
2141         return 0;
2142 }
2143
2144 static void link_drop_from_master(Link *link, NetDev *netdev) {
2145         Link *master;
2146
2147         assert(link);
2148
2149         if (!link->manager || !netdev)
2150                 return;
2151
2152         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2153                 return;
2154
2155         link_unref(set_remove(master->slaves, link));
2156 }
2157
2158 static void link_detach_from_manager(Link *link) {
2159         if (!link || !link->manager)
2160                 return;
2161
2162         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2163         link_clean(link);
2164
2165         /* The following must be called at last. */
2166         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2167         link_unref(link);
2168 }
2169
2170 void link_drop(Link *link) {
2171         if (!link || link->state == LINK_STATE_LINGER)
2172                 return;
2173
2174         link_set_state(link, LINK_STATE_LINGER);
2175
2176         link_free_carrier_maps(link);
2177
2178         if (link->network) {
2179                 link_drop_from_master(link, link->network->bridge);
2180                 link_drop_from_master(link, link->network->bond);
2181         }
2182
2183         log_link_debug(link, "Link removed");
2184
2185         (void) unlink(link->state_file);
2186         link_detach_from_manager(link);
2187 }
2188
2189 static int link_joined(Link *link) {
2190         int r;
2191
2192         assert(link);
2193         assert(link->network);
2194
2195         if (!hashmap_isempty(link->bound_to_links)) {
2196                 r = link_handle_bound_to_list(link);
2197                 if (r < 0)
2198                         return r;
2199         } else if (!(link->flags & IFF_UP)) {
2200                 r = link_up(link);
2201                 if (r < 0) {
2202                         link_enter_failed(link);
2203                         return r;
2204                 }
2205         }
2206
2207         if (link->network->bridge) {
2208                 r = link_set_bridge(link);
2209                 if (r < 0)
2210                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2211
2212                 r = link_append_to_master(link, link->network->bridge);
2213                 if (r < 0)
2214                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2215         }
2216
2217         if (link->network->bond) {
2218                 r = link_set_bond(link);
2219                 if (r < 0)
2220                         log_link_error_errno(link, r, "Could not set bond message: %m");
2221
2222                 r = link_append_to_master(link, link->network->bond);
2223                 if (r < 0)
2224                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2225         }
2226
2227         if (link->network->use_br_vlan &&
2228             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2229                 r = link_set_bridge_vlan(link);
2230                 if (r < 0)
2231                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2232         }
2233
2234         /* Skip setting up addresses until it gets carrier,
2235            or it would try to set addresses twice,
2236            which is bad for non-idempotent steps. */
2237         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2238                 return 0;
2239
2240         link_set_state(link, LINK_STATE_CONFIGURING);
2241         return link_request_set_addresses(link);
2242 }
2243
2244 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2245         int r;
2246
2247         assert(link);
2248         assert(link->network);
2249         assert(link->enslaving > 0);
2250
2251         link->enslaving--;
2252
2253         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2254                 return 1;
2255
2256         r = sd_netlink_message_get_errno(m);
2257         if (r < 0 && r != -EEXIST) {
2258                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2259                 link_enter_failed(link);
2260                 return 1;
2261         }
2262
2263         log_link_debug(link, "Joined netdev");
2264
2265         if (link->enslaving == 0) {
2266                 r = link_joined(link);
2267                 if (r < 0)
2268                         link_enter_failed(link);
2269         }
2270
2271         return 1;
2272 }
2273
2274 static int link_enter_join_netdev(Link *link) {
2275         NetDev *netdev;
2276         Iterator i;
2277         int r;
2278
2279         assert(link);
2280         assert(link->network);
2281         assert(link->state == LINK_STATE_INITIALIZED);
2282
2283         link_set_state(link, LINK_STATE_CONFIGURING);
2284
2285         link_dirty(link);
2286         link->enslaving = 0;
2287
2288         if (link->network->bond) {
2289                 if (link->network->bond->state == NETDEV_STATE_READY &&
2290                     link->network->bond->ifindex == link->master_ifindex)
2291                         return link_joined(link);
2292
2293                 log_struct(LOG_DEBUG,
2294                            LOG_LINK_INTERFACE(link),
2295                            LOG_NETDEV_INTERFACE(link->network->bond),
2296                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2297
2298                 link->enslaving++;
2299
2300                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2301                 if (r < 0) {
2302                         log_struct_errno(LOG_WARNING, r,
2303                                          LOG_LINK_INTERFACE(link),
2304                                          LOG_NETDEV_INTERFACE(link->network->bond),
2305                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2306                         link_enter_failed(link);
2307                         return r;
2308                 }
2309         }
2310
2311         if (link->network->bridge) {
2312                 log_struct(LOG_DEBUG,
2313                            LOG_LINK_INTERFACE(link),
2314                            LOG_NETDEV_INTERFACE(link->network->bridge),
2315                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2316
2317                 link->enslaving++;
2318
2319                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2320                 if (r < 0) {
2321                         log_struct_errno(LOG_WARNING, r,
2322                                          LOG_LINK_INTERFACE(link),
2323                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2324                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2325                         link_enter_failed(link);
2326                         return r;
2327                 }
2328         }
2329
2330         if (link->network->vrf) {
2331                 log_struct(LOG_DEBUG,
2332                            LOG_LINK_INTERFACE(link),
2333                            LOG_NETDEV_INTERFACE(link->network->vrf),
2334                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2335
2336                 link->enslaving++;
2337
2338                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2339                 if (r < 0) {
2340                         log_struct_errno(LOG_WARNING, r,
2341                                          LOG_LINK_INTERFACE(link),
2342                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2343                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2344                         link_enter_failed(link);
2345                         return r;
2346                 }
2347         }
2348
2349         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2350
2351                 if (netdev->ifindex > 0)
2352                         /* Assume already enslaved. */
2353                         continue;
2354
2355                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2356                         continue;
2357
2358                 log_struct(LOG_DEBUG,
2359                            LOG_LINK_INTERFACE(link),
2360                            LOG_NETDEV_INTERFACE(netdev),
2361                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2362
2363                 link->enslaving++;
2364
2365                 r = netdev_join(netdev, link, netdev_join_handler);
2366                 if (r < 0) {
2367                         log_struct_errno(LOG_WARNING, r,
2368                                          LOG_LINK_INTERFACE(link),
2369                                          LOG_NETDEV_INTERFACE(netdev),
2370                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2371                         link_enter_failed(link);
2372                         return r;
2373                 }
2374         }
2375
2376         if (link->enslaving == 0)
2377                 return link_joined(link);
2378
2379         return 0;
2380 }
2381
2382 static int link_set_ipv4_forward(Link *link) {
2383         int r;
2384
2385         if (!link_ipv4_forward_enabled(link))
2386                 return 0;
2387
2388         /* We propagate the forwarding flag from one interface to the
2389          * global setting one way. This means: as long as at least one
2390          * interface was configured at any time that had IP forwarding
2391          * enabled the setting will stay on for good. We do this
2392          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2393          * somewhat in sync (see below). */
2394
2395         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2396         if (r < 0)
2397                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2398
2399         return 0;
2400 }
2401
2402 static int link_set_ipv6_forward(Link *link) {
2403         int r;
2404
2405         if (!link_ipv6_forward_enabled(link))
2406                 return 0;
2407
2408         /* On Linux, the IPv6 stack does not know a per-interface
2409          * packet forwarding setting: either packet forwarding is on
2410          * for all, or off for all. We hence don't bother with a
2411          * per-interface setting, but simply propagate the interface
2412          * flag, if it is set, to the global flag, one-way. Note that
2413          * while IPv4 would allow a per-interface flag, we expose the
2414          * same behaviour there and also propagate the setting from
2415          * one to all, to keep things simple (see above). */
2416
2417         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2418         if (r < 0)
2419                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2420
2421         return 0;
2422 }
2423
2424 static int link_set_ipv6_privacy_extensions(Link *link) {
2425         IPv6PrivacyExtensions s;
2426         int r;
2427
2428         s = link_ipv6_privacy_extensions(link);
2429         if (s < 0)
2430                 return 0;
2431
2432         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2433         if (r < 0)
2434                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2435
2436         return 0;
2437 }
2438
2439 static int link_set_ipv6_accept_ra(Link *link) {
2440         int r;
2441
2442         /* Make this a NOP if IPv6 is not available */
2443         if (!socket_ipv6_is_supported())
2444                 return 0;
2445
2446         if (link->flags & IFF_LOOPBACK)
2447                 return 0;
2448
2449         if (!link->network)
2450                 return 0;
2451
2452         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2453         if (r < 0)
2454                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2455
2456         return 0;
2457 }
2458
2459 static int link_set_ipv6_dad_transmits(Link *link) {
2460         int r;
2461
2462         /* Make this a NOP if IPv6 is not available */
2463         if (!socket_ipv6_is_supported())
2464                 return 0;
2465
2466         if (link->flags & IFF_LOOPBACK)
2467                 return 0;
2468
2469         if (!link->network)
2470                 return 0;
2471
2472         if (link->network->ipv6_dad_transmits < 0)
2473                 return 0;
2474
2475         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2476         if (r < 0)
2477                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2478
2479         return 0;
2480 }
2481
2482 static int link_set_ipv6_hop_limit(Link *link) {
2483         int r;
2484
2485         /* Make this a NOP if IPv6 is not available */
2486         if (!socket_ipv6_is_supported())
2487                 return 0;
2488
2489         if (link->flags & IFF_LOOPBACK)
2490                 return 0;
2491
2492         if (!link->network)
2493                 return 0;
2494
2495         if (link->network->ipv6_hop_limit < 0)
2496                 return 0;
2497
2498         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2499         if (r < 0)
2500                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2501
2502         return 0;
2503 }
2504
2505 static int link_set_ipv6_mtu(Link *link) {
2506         int r;
2507
2508         /* Make this a NOP if IPv6 is not available */
2509         if (!socket_ipv6_is_supported())
2510                 return 0;
2511
2512         if (link->flags & IFF_LOOPBACK)
2513                 return 0;
2514
2515         if (link->network->ipv6_mtu == 0)
2516                 return 0;
2517
2518         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2519          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2520         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2521                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2522                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2523         }
2524
2525         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2526         if (r < 0) {
2527                 if (link->mtu < link->network->ipv6_mtu)
2528                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2529                                          link->network->ipv6_mtu, link->mtu);
2530                 else
2531                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2532         }
2533
2534         link->ipv6_mtu_set = true;
2535
2536         return 0;
2537 }
2538
2539 static int link_set_ipv4_accept_local(Link *link) {
2540         int r;
2541
2542         if (link->flags & IFF_LOOPBACK)
2543                 return 0;
2544
2545         if (link->network->ipv4_accept_local < 0)
2546                 return 0;
2547
2548         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2549         if (r < 0)
2550                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2551
2552         return 0;
2553 }
2554
2555 static bool link_is_static_address_configured(Link *link, Address *address) {
2556         Address *net_address;
2557
2558         assert(link);
2559         assert(address);
2560
2561         if (!link->network)
2562                 return false;
2563
2564         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2565                 if (address_equal(net_address, address))
2566                         return true;
2567
2568         return false;
2569 }
2570
2571 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2572         Neighbor *net_neighbor;
2573
2574         assert(link);
2575         assert(neighbor);
2576
2577         if (!link->network)
2578                 return false;
2579
2580         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2581                 if (neighbor_equal(net_neighbor, neighbor))
2582                         return true;
2583
2584         return false;
2585 }
2586
2587 static bool link_is_static_route_configured(Link *link, Route *route) {
2588         Route *net_route;
2589
2590         assert(link);
2591         assert(route);
2592
2593         if (!link->network)
2594                 return false;
2595
2596         LIST_FOREACH(routes, net_route, link->network->static_routes)
2597                 if (route_equal(net_route, route))
2598                         return true;
2599
2600         return false;
2601 }
2602
2603 static bool link_address_is_dynamic(Link *link, Address *address) {
2604         Route *route;
2605         Iterator i;
2606
2607         assert(link);
2608         assert(address);
2609
2610         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2611                 return true;
2612
2613         /* Even when the address is leased from a DHCP server, networkd assign the address
2614          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2615          * corresponding routes with RTPROT_DHCP. */
2616         SET_FOREACH(route, link->routes_foreign, i) {
2617                 if (route->protocol != RTPROT_DHCP)
2618                         continue;
2619
2620                 if (address->family != route->family)
2621                         continue;
2622
2623                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2624                         return true;
2625         }
2626
2627         return false;
2628 }
2629
2630 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2631         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2632         sd_netlink_message *addr;
2633         int r;
2634
2635         assert(link);
2636         assert(link->manager);
2637         assert(link->manager->rtnl);
2638
2639         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2640         if (r < 0)
2641                 return r;
2642
2643         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2644         if (r < 0)
2645                 return r;
2646
2647         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2648                 unsigned char flags;
2649                 int ifindex;
2650
2651                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2652                 if (r < 0) {
2653                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2654                         continue;
2655                 } else if (link->ifindex != ifindex)
2656                         continue;
2657
2658                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2659                 if (r < 0) {
2660                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2661                         continue;
2662                 } else if (!(flags & IFA_F_TENTATIVE))
2663                         continue;
2664
2665                 log_link_debug(link, "Found tentative ipv6 link-local address");
2666                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2667         }
2668
2669         return 0;
2670 }
2671
2672 static int link_drop_foreign_config(Link *link) {
2673         Address *address;
2674         Neighbor *neighbor;
2675         Route *route;
2676         Iterator i;
2677         int r;
2678
2679         /* The kernel doesn't notify us about tentative addresses;
2680          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2681         if (!link_ipv6ll_enabled(link)) {
2682                 r = link_enumerate_ipv6_tentative_addresses(link);
2683                 if (r < 0)
2684                         return r;
2685         }
2686
2687         SET_FOREACH(address, link->addresses_foreign, i) {
2688                 /* we consider IPv6LL addresses to be managed by the kernel */
2689                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2690                         continue;
2691
2692                 if (link_address_is_dynamic(link, address)) {
2693                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2694                                 continue;
2695                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2696                         continue;
2697
2698                 if (link_is_static_address_configured(link, address)) {
2699                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2700                         if (r < 0)
2701                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2702                 } else {
2703                         r = address_remove(address, link, NULL);
2704                         if (r < 0)
2705                                 return r;
2706                 }
2707         }
2708
2709         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2710                 if (link_is_neighbor_configured(link, neighbor)) {
2711                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2712                         if (r < 0)
2713                                 return r;
2714                 } else {
2715                         r = neighbor_remove(neighbor, link, NULL);
2716                         if (r < 0)
2717                                 return r;
2718                 }
2719         }
2720
2721         SET_FOREACH(route, link->routes_foreign, i) {
2722                 /* do not touch routes managed by the kernel */
2723                 if (route->protocol == RTPROT_KERNEL)
2724                         continue;
2725
2726                 /* do not touch multicast route added by kernel */
2727                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2728                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2729                 if (route->protocol == RTPROT_BOOT &&
2730                     route->family == AF_INET6 &&
2731                     route->dst_prefixlen == 8 &&
2732                     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 }}} }))
2733                         continue;
2734
2735                 if (route->protocol == RTPROT_STATIC && link->network &&
2736                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2737                         continue;
2738
2739                 if (route->protocol == RTPROT_DHCP && link->network &&
2740                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2741                         continue;
2742
2743                 if (link_is_static_route_configured(link, route)) {
2744                         r = route_add(link, route, NULL);
2745                         if (r < 0)
2746                                 return r;
2747                 } else {
2748                         r = route_remove(route, link, NULL);
2749                         if (r < 0)
2750                                 return r;
2751                 }
2752         }
2753
2754         return 0;
2755 }
2756
2757 static int link_drop_config(Link *link) {
2758         Address *address, *pool_address;
2759         Neighbor *neighbor;
2760         Route *route;
2761         Iterator i;
2762         int r;
2763
2764         SET_FOREACH(address, link->addresses, i) {
2765                 /* we consider IPv6LL addresses to be managed by the kernel */
2766                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2767                         continue;
2768
2769                 r = address_remove(address, link, NULL);
2770                 if (r < 0)
2771                         return r;
2772
2773                 /* If this address came from an address pool, clean up the pool */
2774                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2775                         if (address_equal(address, pool_address)) {
2776                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2777                                 address_free(pool_address);
2778                                 break;
2779                         }
2780                 }
2781         }
2782
2783         SET_FOREACH(neighbor, link->neighbors, i) {
2784                 r = neighbor_remove(neighbor, link, NULL);
2785                 if (r < 0)
2786                         return r;
2787         }
2788
2789         SET_FOREACH(route, link->routes, i) {
2790                 /* do not touch routes managed by the kernel */
2791                 if (route->protocol == RTPROT_KERNEL)
2792                         continue;
2793
2794                 r = route_remove(route, link, NULL);
2795                 if (r < 0)
2796                         return r;
2797         }
2798
2799         ndisc_flush(link);
2800
2801         return 0;
2802 }
2803
2804 static int link_configure_ipv4_dad(Link *link) {
2805         Address *address;
2806         int r;
2807
2808         assert(link);
2809         assert(link->network);
2810
2811         LIST_FOREACH(addresses, address, link->network->static_addresses)
2812                 if (address->family == AF_INET &&
2813                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2814                         r = configure_ipv4_duplicate_address_detection(link, address);
2815                         if (r < 0)
2816                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2817                 }
2818
2819         return 0;
2820 }
2821
2822 static int link_configure_traffic_control(Link *link) {
2823         TrafficControl *tc;
2824         Iterator i;
2825         int r;
2826
2827         link->tc_configured = false;
2828         link->tc_messages = 0;
2829
2830         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2831                 r = traffic_control_configure(link, tc);
2832                 if (r < 0)
2833                         return r;
2834         }
2835
2836         if (link->tc_messages == 0)
2837                 link->tc_configured = true;
2838         else
2839                 log_link_debug(link, "Configuring traffic control");
2840
2841         return 0;
2842 }
2843
2844 static int link_configure_sr_iov(Link *link) {
2845         SRIOV *sr_iov;
2846         Iterator i;
2847         int r;
2848
2849         link->sr_iov_configured = false;
2850         link->sr_iov_messages = 0;
2851
2852         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2853                 r = sr_iov_configure(link, sr_iov);
2854                 if (r < 0)
2855                         return r;
2856         }
2857
2858         if (link->sr_iov_messages == 0)
2859                 link->sr_iov_configured = true;
2860         else
2861                 log_link_debug(link, "Configuring SR-IOV");
2862
2863         return 0;
2864 }
2865
2866 static int link_configure(Link *link) {
2867         int r;
2868
2869         assert(link);
2870         assert(link->network);
2871         assert(link->state == LINK_STATE_INITIALIZED);
2872
2873         r = link_configure_traffic_control(link);
2874         if (r < 0)
2875                 return r;
2876
2877         r = link_configure_sr_iov(link);
2878         if (r < 0)
2879                 return r;
2880
2881         if (link->iftype == ARPHRD_CAN)
2882                 return link_configure_can(link);
2883
2884         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2885          * for this interface, then enable IPv6 */
2886         (void) link_update_ipv6_sysctl(link);
2887
2888         r = link_set_proxy_arp(link);
2889         if (r < 0)
2890                return r;
2891
2892         r = ipv6_proxy_ndp_addresses_configure(link);
2893         if (r < 0)
2894                 return r;
2895
2896         r = link_set_ipv4_forward(link);
2897         if (r < 0)
2898                 return r;
2899
2900         r = link_set_ipv6_forward(link);
2901         if (r < 0)
2902                 return r;
2903
2904         r = link_set_ipv6_privacy_extensions(link);
2905         if (r < 0)
2906                 return r;
2907
2908         r = link_set_ipv6_accept_ra(link);
2909         if (r < 0)
2910                 return r;
2911
2912         r = link_set_ipv6_dad_transmits(link);
2913         if (r < 0)
2914                 return r;
2915
2916         r = link_set_ipv6_hop_limit(link);
2917         if (r < 0)
2918                 return r;
2919
2920         r = link_set_ipv4_accept_local(link);
2921         if (r < 0)
2922                 return r;
2923
2924         r = link_set_flags(link);
2925         if (r < 0)
2926                 return r;
2927
2928         r = link_set_group(link);
2929         if (r < 0)
2930                 return r;
2931
2932         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2933                 r = ipv4ll_configure(link);
2934                 if (r < 0)
2935                         return r;
2936         }
2937
2938         if (link_dhcp4_enabled(link)) {
2939                 r = dhcp4_set_promote_secondaries(link);
2940                 if (r < 0)
2941                         return r;
2942
2943                 r = dhcp4_configure(link);
2944                 if (r < 0)
2945                         return r;
2946         }
2947
2948         if (link_dhcp4_server_enabled(link)) {
2949                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2950                 if (r < 0)
2951                         return r;
2952
2953                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2954                 if (r < 0)
2955                         return r;
2956         }
2957
2958         if (link_dhcp6_enabled(link) ||
2959             link_ipv6_accept_ra_enabled(link)) {
2960                 r = dhcp6_configure(link);
2961                 if (r < 0)
2962                         return r;
2963         }
2964
2965         if (link_ipv6_accept_ra_enabled(link)) {
2966                 r = ndisc_configure(link);
2967                 if (r < 0)
2968                         return r;
2969         }
2970
2971         if (link_radv_enabled(link)) {
2972                 r = radv_configure(link);
2973                 if (r < 0)
2974                         return r;
2975         }
2976
2977         if (link_lldp_rx_enabled(link)) {
2978                 r = link_lldp_rx_configure(link);
2979                 if (r < 0)
2980                         return r;
2981         }
2982
2983         r = link_configure_mtu(link);
2984         if (r < 0)
2985                 return r;
2986
2987         r = link_configure_addrgen_mode(link);
2988         if (r < 0)
2989                 return r;
2990
2991         r = link_configure_ipv4_dad(link);
2992         if (r < 0)
2993                 return r;
2994
2995         return link_configure_continue(link);
2996 }
2997
2998 /* The configuration continues in this separate function, instead of
2999  * including this in the above link_configure() function, for two
3000  * reasons:
3001  * 1) some devices reset the link when the mtu is set, which caused
3002  *    an infinite loop here in networkd; see:
3003  *    https://github.com/systemd/systemd/issues/6593
3004  *    https://github.com/systemd/systemd/issues/9831
3005  * 2) if ipv6ll is disabled, then bringing the interface up must be
3006  *    delayed until after we get confirmation from the kernel that
3007  *    the addr_gen_mode parameter has been set (via netlink), see:
3008  *    https://github.com/systemd/systemd/issues/13882
3009  */
3010 static int link_configure_continue(Link *link) {
3011         int r;
3012
3013         assert(link);
3014         assert(link->network);
3015         assert(link->state == LINK_STATE_INITIALIZED);
3016
3017         if (link->setting_mtu || link->setting_genmode)
3018                 return 0;
3019
3020         /* Drop foreign config, but ignore loopback or critical devices.
3021          * We do not want to remove loopback address or addresses used for root NFS. */
3022         if (!(link->flags & IFF_LOOPBACK) &&
3023             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3024                 r = link_drop_foreign_config(link);
3025                 if (r < 0)
3026                         return r;
3027         }
3028
3029         /* The kernel resets ipv6 mtu after changing device mtu;
3030          * we must set this here, after we've set device mtu */
3031         r = link_set_ipv6_mtu(link);
3032         if (r < 0)
3033                 return r;
3034
3035         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3036                 r = link_acquire_conf(link);
3037                 if (r < 0)
3038                         return r;
3039         }
3040
3041         return link_enter_join_netdev(link);
3042 }
3043
3044 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3045         assert(duid);
3046
3047         if (duid->raw_data_len > 0)
3048                 return 0;
3049
3050         if (duid->type != DUID_TYPE_UUID)
3051                 return -EINVAL;
3052
3053         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3054         duid->raw_data_len = sizeof(sd_id128_t);
3055
3056         return 1;
3057 }
3058
3059 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3060         Manager *manager = userdata;
3061         const sd_bus_error *e;
3062         const void *a;
3063         size_t sz;
3064         DUID *duid;
3065         Link *link;
3066         int r;
3067
3068         assert(m);
3069         assert(manager);
3070
3071         e = sd_bus_message_get_error(m);
3072         if (e) {
3073                 log_error_errno(sd_bus_error_get_errno(e),
3074                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3075                                 e->message);
3076                 goto configure;
3077         }
3078
3079         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3080         if (r < 0)
3081                 goto configure;
3082
3083         if (sz != sizeof(sd_id128_t)) {
3084                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3085                 goto configure;
3086         }
3087
3088         memcpy(&manager->product_uuid, a, sz);
3089         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3090                 (void) duid_set_uuid(duid, manager->product_uuid);
3091
3092         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3093
3094 configure:
3095         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3096                 link_unref(link);
3097
3098                 r = link_configure(link);
3099                 if (r < 0)
3100                         link_enter_failed(link);
3101         }
3102
3103         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3104
3105         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3106          * even if the method fails. */
3107         manager->has_product_uuid = true;
3108
3109         return 1;
3110 }
3111
3112 static bool link_requires_uuid(Link *link) {
3113         const DUID *duid;
3114
3115         assert(link);
3116         assert(link->manager);
3117         assert(link->network);
3118
3119         duid = link_get_duid(link);
3120         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3121                 return false;
3122
3123         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3124                 return true;
3125
3126         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3127                 return true;
3128
3129         return false;
3130 }
3131
3132 static int link_configure_duid(Link *link) {
3133         Manager *m;
3134         DUID *duid;
3135         int r;
3136
3137         assert(link);
3138         assert(link->manager);
3139         assert(link->network);
3140
3141         m = link->manager;
3142         duid = link_get_duid(link);
3143
3144         if (!link_requires_uuid(link))
3145                 return 1;
3146
3147         if (m->has_product_uuid) {
3148                 (void) duid_set_uuid(duid, m->product_uuid);
3149                 return 1;
3150         }
3151
3152         if (!m->links_requesting_uuid) {
3153                 r = manager_request_product_uuid(m, link);
3154                 if (r < 0) {
3155                         if (r == -ENOMEM)
3156                                 return r;
3157
3158                         log_link_warning_errno(link, r,
3159                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3160                         return 1;
3161                 }
3162         } else {
3163                 r = set_put(m->links_requesting_uuid, link);
3164                 if (r < 0)
3165                         return log_oom();
3166                 if (r > 0)
3167                         link_ref(link);
3168
3169                 r = set_put(m->duids_requesting_uuid, duid);
3170                 if (r < 0)
3171                         return log_oom();
3172         }
3173
3174         return 0;
3175 }
3176
3177 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3178         Network *network;
3179         int r;
3180
3181         if (m) {
3182                 _cleanup_strv_free_ char **s = NULL;
3183
3184                 r = sd_netlink_message_get_errno(m);
3185                 if (r < 0)
3186                         return r;
3187
3188                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3189                 if (r < 0 && r != -ENODATA)
3190                         return r;
3191
3192                 strv_free_and_replace(link->alternative_names, s);
3193         }
3194
3195         r = network_get(link->manager, link->iftype, link->sd_device,
3196                         link->ifname, link->alternative_names, link->driver,
3197                         &link->mac, &link->permanent_mac,
3198                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3199         if (r == -ENOENT) {
3200                 link_enter_unmanaged(link);
3201                 return 0;
3202         } else if (r == 0 && network->unmanaged) {
3203                 link_enter_unmanaged(link);
3204                 return 0;
3205         } else if (r < 0)
3206                 return r;
3207
3208         if (link->network == network && !force)
3209                 return 0;
3210
3211         log_link_info(link, "Re-configuring with %s", network->filename);
3212
3213         /* Dropping old .network file */
3214         r = link_stop_clients(link, false);
3215         if (r < 0)
3216                 return r;
3217
3218         if (link_dhcp4_server_enabled(link))
3219                 (void) sd_dhcp_server_stop(link->dhcp_server);
3220
3221         r = link_drop_config(link);
3222         if (r < 0)
3223                 return r;
3224
3225         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3226                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3227                 r = link_drop_foreign_config(link);
3228                 if (r < 0)
3229                         return r;
3230         }
3231
3232         link_free_carrier_maps(link);
3233         link_free_engines(link);
3234         link->network = network_unref(link->network);
3235
3236         /* Then, apply new .network file */
3237         r = network_apply(network, link);
3238         if (r < 0)
3239                 return r;
3240
3241         r = link_new_carrier_maps(link);
3242         if (r < 0)
3243                 return r;
3244
3245         link_set_state(link, LINK_STATE_INITIALIZED);
3246         link_dirty(link);
3247
3248         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3249          * link_configure() is called later asynchronously. */
3250         r = link_configure_duid(link);
3251         if (r <= 0)
3252                 return r;
3253
3254         r = link_configure(link);
3255         if (r < 0)
3256                 return r;
3257
3258         return 0;
3259 }
3260
3261 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3262         int r;
3263
3264         r = link_reconfigure_internal(link, m, false);
3265         if (r < 0)
3266                 link_enter_failed(link);
3267
3268         return 1;
3269 }
3270
3271 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3272         int r;
3273
3274         r = link_reconfigure_internal(link, m, true);
3275         if (r < 0)
3276                 link_enter_failed(link);
3277
3278         return 1;
3279 }
3280
3281 int link_reconfigure(Link *link, bool force) {
3282         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3283         int r;
3284
3285         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3286                 return 0;
3287
3288         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3289                                      link->ifindex);
3290         if (r < 0)
3291                 return r;
3292
3293         r = netlink_call_async(link->manager->rtnl, NULL, req,
3294                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3295                                link_netlink_destroy_callback, link);
3296         if (r < 0)
3297                 return r;
3298
3299         link_ref(link);
3300
3301         return 0;
3302 }
3303
3304 static int link_initialized_and_synced(Link *link) {
3305         Network *network;
3306         int r;
3307
3308         assert(link);
3309         assert(link->ifname);
3310         assert(link->manager);
3311
3312         /* We may get called either from the asynchronous netlink callback,
3313          * or directly for link_add() if running in a container. See link_add(). */
3314         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3315                 return 0;
3316
3317         log_link_debug(link, "Link state is up-to-date");
3318         link_set_state(link, LINK_STATE_INITIALIZED);
3319
3320         r = link_new_bound_by_list(link);
3321         if (r < 0)
3322                 return r;
3323
3324         r = link_handle_bound_by_list(link);
3325         if (r < 0)
3326                 return r;
3327
3328         if (!link->network) {
3329                 r = wifi_get_info(link);
3330                 if (r < 0)
3331                         return r;
3332
3333                 r = network_get(link->manager, link->iftype, link->sd_device,
3334                                 link->ifname, link->alternative_names, link->driver,
3335                                 &link->mac, &link->permanent_mac,
3336                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3337                 if (r == -ENOENT) {
3338                         link_enter_unmanaged(link);
3339                         return 0;
3340                 } else if (r == 0 && network->unmanaged) {
3341                         link_enter_unmanaged(link);
3342                         return 0;
3343                 } else if (r < 0)
3344                         return r;
3345
3346                 if (link->flags & IFF_LOOPBACK) {
3347                         if (network->link_local != ADDRESS_FAMILY_NO)
3348                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3349
3350                         if (network->dhcp != ADDRESS_FAMILY_NO)
3351                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3352
3353                         if (network->dhcp_server)
3354                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3355                 }
3356
3357                 r = network_apply(network, link);
3358                 if (r < 0)
3359                         return r;
3360         }
3361
3362         r = link_new_bound_to_list(link);
3363         if (r < 0)
3364                 return r;
3365
3366         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3367          * link_configure() is called later asynchronously. */
3368         r = link_configure_duid(link);
3369         if (r <= 0)
3370                 return r;
3371
3372         r = link_configure(link);
3373         if (r < 0)
3374                 return r;
3375
3376         return 0;
3377 }
3378
3379 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3380         _cleanup_strv_free_ char **s = NULL;
3381         int r;
3382
3383         r = sd_netlink_message_get_errno(m);
3384         if (r < 0) {
3385                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3386                 link_enter_failed(link);
3387                 return 0;
3388         }
3389
3390         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3391         if (r < 0 && r != -ENODATA) {
3392                 link_enter_failed(link);
3393                 return 0;
3394         }
3395
3396         strv_free_and_replace(link->alternative_names, s);
3397
3398         r = link_initialized_and_synced(link);
3399         if (r < 0)
3400                 link_enter_failed(link);
3401         return 1;
3402 }
3403
3404 int link_initialized(Link *link, sd_device *device) {
3405         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3406         int r;
3407
3408         assert(link);
3409         assert(link->manager);
3410         assert(link->manager->rtnl);
3411         assert(device);
3412
3413         if (link->state != LINK_STATE_PENDING)
3414                 return 0;
3415
3416         if (link->sd_device)
3417                 return 0;
3418
3419         log_link_debug(link, "udev initialized link");
3420         link_set_state(link, LINK_STATE_INITIALIZED);
3421
3422         link->sd_device = sd_device_ref(device);
3423
3424         /* udev has initialized the link, but we don't know if we have yet
3425          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3426          * when it returns we know that the pending NEWLINKs have already been
3427          * processed and that we are up-to-date */
3428
3429         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3430                                      link->ifindex);
3431         if (r < 0)
3432                 return r;
3433
3434         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3435                                link_netlink_destroy_callback, link);
3436         if (r < 0)
3437                 return r;
3438
3439         link_ref(link);
3440
3441         return 0;
3442 }
3443
3444 static int link_load(Link *link) {
3445         _cleanup_free_ char *network_file = NULL,
3446                             *addresses = NULL,
3447                             *routes = NULL,
3448                             *dhcp4_address = NULL,
3449                             *ipv4ll_address = NULL;
3450         union in_addr_union address;
3451         const char *p;
3452         int r;
3453
3454         assert(link);
3455
3456         r = parse_env_file(NULL, link->state_file,
3457                            "NETWORK_FILE", &network_file,
3458                            "ADDRESSES", &addresses,
3459                            "ROUTES", &routes,
3460                            "DHCP4_ADDRESS", &dhcp4_address,
3461                            "IPV4LL_ADDRESS", &ipv4ll_address);
3462         if (r < 0 && r != -ENOENT)
3463                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3464
3465         if (network_file) {
3466                 Network *network;
3467                 char *suffix;
3468
3469                 /* drop suffix */
3470                 suffix = strrchr(network_file, '.');
3471                 if (!suffix) {
3472                         log_link_debug(link, "Failed to get network name from %s", network_file);
3473                         goto network_file_fail;
3474                 }
3475                 *suffix = '\0';
3476
3477                 r = network_get_by_name(link->manager, basename(network_file), &network);
3478                 if (r < 0) {
3479                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3480                         goto network_file_fail;
3481                 }
3482
3483                 r = network_apply(network, link);
3484                 if (r < 0)
3485                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3486         }
3487
3488 network_file_fail:
3489
3490         if (addresses) {
3491                 p = addresses;
3492
3493                 for (;;) {
3494                         _cleanup_free_ char *address_str = NULL;
3495                         char *prefixlen_str;
3496                         int family;
3497                         unsigned char prefixlen;
3498
3499                         r = extract_first_word(&p, &address_str, NULL, 0);
3500                         if (r < 0) {
3501                                 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3502                                 continue;
3503                         }
3504                         if (r == 0)
3505                                 break;
3506
3507                         prefixlen_str = strchr(address_str, '/');
3508                         if (!prefixlen_str) {
3509                                 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3510                                 continue;
3511                         }
3512
3513                         *prefixlen_str++ = '\0';
3514
3515                         r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3516                         if (r != 1) {
3517                                 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3518                                 continue;
3519                         }
3520
3521                         r = in_addr_from_string_auto(address_str, &family, &address);
3522                         if (r < 0) {
3523                                 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3524                                 continue;
3525                         }
3526
3527                         r = address_add(link, family, &address, prefixlen, NULL);
3528                         if (r < 0)
3529                                 return log_link_error_errno(link, r, "Failed to add address: %m");
3530                 }
3531         }
3532
3533         if (routes) {
3534                 p = routes;
3535
3536                 for (;;) {
3537                         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3538                         _cleanup_(route_freep) Route *tmp = NULL;
3539                         _cleanup_free_ char *route_str = NULL;
3540                         char *prefixlen_str;
3541                         Route *route;
3542
3543                         r = extract_first_word(&p, &route_str, NULL, 0);
3544                         if (r < 0) {
3545                                 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3546                                 continue;
3547                         }
3548                         if (r == 0)
3549                                 break;
3550
3551                         prefixlen_str = strchr(route_str, '/');
3552                         if (!prefixlen_str) {
3553                                 log_link_debug(link, "Failed to parse route %s", route_str);
3554                                 continue;
3555                         }
3556
3557                         *prefixlen_str++ = '\0';
3558
3559                         r = route_new(&tmp);
3560                         if (r < 0)
3561                                 return log_oom();
3562
3563                         r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT, &tmp->dst_prefixlen, &tmp->tos, &tmp->priority, &tmp->table, &tmp->lifetime);
3564                         if (r != 5) {
3565                                 log_link_debug(link,
3566                                                "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3567                                                prefixlen_str);
3568                                 continue;
3569                         }
3570
3571                         r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3572                         if (r < 0) {
3573                                 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3574                                 continue;
3575                         }
3576
3577                         r = route_add(link, tmp, &route);
3578                         if (r < 0)
3579                                 return log_link_error_errno(link, r, "Failed to add route: %m");
3580
3581                         if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3582                                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), route->lifetime,
3583                                                       0, route_expire_handler, route);
3584                                 if (r < 0)
3585                                         log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3586                         }
3587
3588                         sd_event_source_unref(route->expire);
3589                         route->expire = TAKE_PTR(expire);
3590                 }
3591         }
3592
3593         if (dhcp4_address) {
3594                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3595                 if (r < 0) {
3596                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3597                         goto dhcp4_address_fail;
3598                 }
3599
3600                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3601                 if (r < 0)
3602                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3603
3604                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3605                 if (r < 0)
3606                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3607
3608                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3609                 if (r < 0)
3610                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3611         }
3612
3613 dhcp4_address_fail:
3614
3615         if (ipv4ll_address) {
3616                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3617                 if (r < 0) {
3618                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3619                         goto ipv4ll_address_fail;
3620                 }
3621
3622                 r = sd_ipv4ll_new(&link->ipv4ll);
3623                 if (r < 0)
3624                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3625
3626                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3627                 if (r < 0)
3628                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3629
3630                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3631                 if (r < 0)
3632                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3633         }
3634
3635 ipv4ll_address_fail:
3636
3637         return 0;
3638 }
3639
3640 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3641         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3642         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3643         Link *link;
3644         int r;
3645
3646         assert(m);
3647         assert(m->rtnl);
3648         assert(message);
3649         assert(ret);
3650
3651         r = link_new(m, message, ret);
3652         if (r < 0)
3653                 return r;
3654
3655         link = *ret;
3656
3657         log_link_debug(link, "Link %d added", link->ifindex);
3658
3659         r = link_load(link);
3660         if (r < 0)
3661                 return r;
3662
3663         if (path_is_read_only_fs("/sys") <= 0) {
3664                 /* udev should be around */
3665                 sprintf(ifindex_str, "n%d", link->ifindex);
3666                 r = sd_device_new_from_device_id(&device, ifindex_str);
3667                 if (r < 0) {
3668                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3669                         return 0;
3670                 }
3671
3672                 r = sd_device_get_is_initialized(device);
3673                 if (r < 0) {
3674                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3675                         goto failed;
3676                 }
3677                 if (r == 0) {
3678                         /* not yet ready */
3679                         log_link_debug(link, "link pending udev initialization...");
3680                         return 0;
3681                 }
3682
3683                 r = device_is_renaming(device);
3684                 if (r < 0) {
3685                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3686                         goto failed;
3687                 }
3688                 if (r > 0) {
3689                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3690                         return 0;
3691                 }
3692
3693                 r = link_initialized(link, device);
3694                 if (r < 0)
3695                         goto failed;
3696         } else {
3697                 r = link_initialized_and_synced(link);
3698                 if (r < 0)
3699                         goto failed;
3700         }
3701
3702         return 0;
3703 failed:
3704         link_enter_failed(link);
3705         return r;
3706 }
3707
3708 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3709         int r;
3710
3711         assert(link);
3712
3713         log_link_info(link, "Gained IPv6LL");
3714
3715         link->ipv6ll_address = *address;
3716         link_check_ready(link);
3717
3718         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3719                 r = link_acquire_ipv6_conf(link);
3720                 if (r < 0) {
3721                         link_enter_failed(link);
3722                         return r;
3723                 }
3724         }
3725
3726         return 0;
3727 }
3728
3729 static int link_carrier_gained(Link *link) {
3730         int r;
3731
3732         assert(link);
3733
3734         r = wifi_get_info(link);
3735         if (r < 0)
3736                 return r;
3737         if (r > 0) {
3738                 r = link_reconfigure_internal(link, NULL, false);
3739                 if (r < 0) {
3740                         link_enter_failed(link);
3741                         return r;
3742                 }
3743         }
3744
3745         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3746                 r = link_acquire_conf(link);
3747                 if (r < 0) {
3748                         link_enter_failed(link);
3749                         return r;
3750                 }
3751
3752                 link_set_state(link, LINK_STATE_CONFIGURING);
3753                 r = link_request_set_addresses(link);
3754                 if (r < 0)
3755                         return r;
3756         }
3757
3758         r = link_handle_bound_by_list(link);
3759         if (r < 0)
3760                 return r;
3761
3762         return 0;
3763 }
3764
3765 static int link_carrier_lost(Link *link) {
3766         int r;
3767
3768         assert(link);
3769
3770         if (link->network && link->network->ignore_carrier_loss)
3771                 return 0;
3772
3773         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3774          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3775          * configuration and stop the clients as well. */
3776         if (link->setting_mtu)
3777                 return 0;
3778
3779         r = link_stop_clients(link, false);
3780         if (r < 0) {
3781                 link_enter_failed(link);
3782                 return r;
3783         }
3784
3785         if (link_dhcp4_server_enabled(link))
3786                 (void) sd_dhcp_server_stop(link->dhcp_server);
3787
3788         r = link_drop_config(link);
3789         if (r < 0)
3790                 return r;
3791
3792         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3793                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3794                 r = link_drop_foreign_config(link);
3795                 if (r < 0)
3796                         return r;
3797         }
3798
3799         r = link_handle_bound_by_list(link);
3800         if (r < 0)
3801                 return r;
3802
3803         return 0;
3804 }
3805
3806 int link_carrier_reset(Link *link) {
3807         int r;
3808
3809         assert(link);
3810
3811         if (link_has_carrier(link)) {
3812                 r = link_carrier_lost(link);
3813                 if (r < 0)
3814                         return r;
3815
3816                 r = link_carrier_gained(link);
3817                 if (r < 0)
3818                         return r;
3819
3820                 log_link_info(link, "Reset carrier");
3821         }
3822
3823         return 0;
3824 }
3825
3826 /* This is called every time an interface admin state changes to up;
3827  * specifically, when IFF_UP flag changes from unset to set */
3828 static int link_admin_state_up(Link *link) {
3829         int r;
3830
3831         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3832          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3833          * ipv6_mtu_set prevents this from trying to set it too early before
3834          * the link->network has been setup; we only need to reset it
3835          * here if we've already set it during normal initialization. */
3836         if (link->ipv6_mtu_set) {
3837                 r = link_set_ipv6_mtu(link);
3838                 if (r < 0)
3839                         return r;
3840         }
3841
3842         return 0;
3843 }
3844
3845 int link_update(Link *link, sd_netlink_message *m) {
3846         _cleanup_strv_free_ char **s = NULL;
3847         struct ether_addr mac;
3848         const char *ifname;
3849         uint32_t mtu;
3850         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3851         int old_master, r;
3852
3853         assert(link);
3854         assert(link->ifname);
3855         assert(m);
3856
3857         if (link->state == LINK_STATE_LINGER) {
3858                 log_link_info(link, "Link re-added");
3859                 link_set_state(link, LINK_STATE_CONFIGURING);
3860
3861                 r = link_new_carrier_maps(link);
3862                 if (r < 0)
3863                         return r;
3864         }
3865
3866         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3867         if (r >= 0 && !streq(ifname, link->ifname)) {
3868                 Manager *manager = link->manager;
3869
3870                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3871
3872                 link_drop(link);
3873                 r = link_add(manager, m, &link);
3874                 if (r < 0)
3875                         return r;
3876         }
3877
3878         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3879         if (r >= 0)
3880                 strv_free_and_replace(link->alternative_names, s);
3881
3882         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3883         if (r >= 0 && mtu > 0) {
3884                 link->mtu = mtu;
3885                 if (link->original_mtu == 0) {
3886                         link->original_mtu = mtu;
3887                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3888                 }
3889
3890                 if (link->dhcp_client) {
3891                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3892                                                    link->mtu);
3893                         if (r < 0)
3894                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3895                 }
3896
3897                 if (link->radv) {
3898                         r = sd_radv_set_mtu(link->radv, link->mtu);
3899                         if (r < 0)
3900                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3901                 }
3902         }
3903
3904         /* The kernel may broadcast NEWLINK messages without the MAC address
3905            set, simply ignore them. */
3906         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3907         if (r >= 0) {
3908                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3909                            ETH_ALEN)) {
3910
3911                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3912                                ETH_ALEN);
3913
3914                         log_link_debug(link, "MAC address: "
3915                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3916                                        mac.ether_addr_octet[0],
3917                                        mac.ether_addr_octet[1],
3918                                        mac.ether_addr_octet[2],
3919                                        mac.ether_addr_octet[3],
3920                                        mac.ether_addr_octet[4],
3921                                        mac.ether_addr_octet[5]);
3922
3923                         if (link->ipv4ll) {
3924                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3925                                 if (r < 0)
3926                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3927                         }
3928
3929                         if (link->dhcp_client) {
3930                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3931                                                            (const uint8_t *) &link->mac,
3932                                                            sizeof (link->mac),
3933                                                            ARPHRD_ETHER);
3934                                 if (r < 0)
3935                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3936
3937                                 r = dhcp4_set_client_identifier(link);
3938                                 if (r < 0)
3939                                         return r;
3940                         }
3941
3942                         if (link->dhcp6_client) {
3943                                 const DUID* duid = link_get_duid(link);
3944
3945                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3946                                                             (const uint8_t *) &link->mac,
3947                                                             sizeof (link->mac),
3948                                                             ARPHRD_ETHER);
3949                                 if (r < 0)
3950                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3951
3952                                 if (link->network->iaid_set) {
3953                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3954                                                                      link->network->iaid);
3955                                         if (r < 0)
3956                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3957                                 }
3958
3959                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3960                                                              duid->type,
3961                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3962                                                              duid->raw_data_len);
3963                                 if (r < 0)
3964                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3965                         }
3966
3967                         if (link->radv) {
3968                                 r = sd_radv_set_mac(link->radv, &link->mac);
3969                                 if (r < 0)
3970                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3971                         }
3972
3973                         if (link->ndisc) {
3974                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3975                                 if (r < 0)
3976                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3977                         }
3978                 }
3979         }
3980
3981         old_master = link->master_ifindex;
3982         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3983
3984         link_was_admin_up = link->flags & IFF_UP;
3985         had_carrier = link_has_carrier(link);
3986
3987         r = link_update_flags(link, m, old_master != link->master_ifindex);
3988         if (r < 0)
3989                 return r;
3990
3991         if (!link_was_admin_up && (link->flags & IFF_UP)) {
3992                 log_link_info(link, "Link UP");
3993
3994                 r = link_admin_state_up(link);
3995                 if (r < 0)
3996                         return r;
3997         } else if (link_was_admin_up && !(link->flags & IFF_UP))
3998                 log_link_info(link, "Link DOWN");
3999
4000         r = link_update_lldp(link);
4001         if (r < 0)
4002                 return r;
4003
4004         carrier_gained = !had_carrier && link_has_carrier(link);
4005         carrier_lost = had_carrier && !link_has_carrier(link);
4006
4007         if (carrier_gained) {
4008                 log_link_info(link, "Gained carrier");
4009
4010                 r = link_carrier_gained(link);
4011                 if (r < 0)
4012                         return r;
4013         } else if (carrier_lost) {
4014                 log_link_info(link, "Lost carrier");
4015
4016                 r = link_carrier_lost(link);
4017                 if (r < 0)
4018                         return r;
4019         }
4020
4021         return 0;
4022 }
4023
4024 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4025         bool space = false;
4026         Iterator i;
4027         Link *link;
4028
4029         assert(f);
4030         assert(prefix);
4031
4032         if (hashmap_isempty(h))
4033                 return;
4034
4035         fputs(prefix, f);
4036         HASHMAP_FOREACH(link, h, i) {
4037                 if (space)
4038                         fputc(' ', f);
4039
4040                 fprintf(f, "%i", link->ifindex);
4041                 space = true;
4042         }
4043
4044         fputc('\n', f);
4045 }
4046
4047 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4048         for (unsigned j = 0; j < n_dns; j++) {
4049                 _cleanup_free_ char *b = NULL;
4050                 int r;
4051
4052                 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4053                 if (r < 0) {
4054                         log_debug_errno(r, "Failed to format address, ignoring: %m");
4055                         continue;
4056                 }
4057
4058                 if (*space)
4059                         fputc(' ', f);
4060                 fputs(b, f);
4061                 *space = true;
4062         }
4063 }
4064
4065 static void serialize_addresses(
4066                 FILE *f,
4067                 const char *lvalue,
4068                 bool *space,
4069                 char **addresses,
4070                 sd_dhcp_lease *lease,
4071                 bool conditional,
4072                 sd_dhcp_lease_server_type what,
4073                 sd_dhcp6_lease *lease6,
4074                 bool conditional6,
4075                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4076                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4077         int r;
4078
4079         bool _space = false;
4080         if (!space)
4081                 space = &_space;
4082
4083         if (lvalue)
4084                 fprintf(f, "%s=", lvalue);
4085         fputstrv(f, addresses, NULL, space);
4086
4087         if (lease && conditional) {
4088                 const struct in_addr *lease_addresses;
4089
4090                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4091                 if (r > 0)
4092                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4093         }
4094
4095         if (lease6 && conditional6 && lease6_get_addr) {
4096                 const struct in6_addr *in6_addrs;
4097
4098                 r = lease6_get_addr(lease6, &in6_addrs);
4099                 if (r > 0)
4100                         serialize_in6_addrs(f, in6_addrs, r, space);
4101         }
4102
4103         if (lease6 && conditional6 && lease6_get_fqdn) {
4104                 char **in6_hosts;
4105
4106                 r = lease6_get_fqdn(lease6, &in6_hosts);
4107                 if (r > 0)
4108                         fputstrv(f, in6_hosts, NULL, space);
4109         }
4110
4111         if (lvalue)
4112                 fputc('\n', f);
4113 }
4114
4115 int link_save(Link *link) {
4116         const char *admin_state, *oper_state, *carrier_state, *address_state;
4117         _cleanup_free_ char *temp_path = NULL;
4118         _cleanup_fclose_ FILE *f = NULL;
4119         Route *route;
4120         Address *a;
4121         Iterator i;
4122         int r;
4123
4124         assert(link);
4125         assert(link->state_file);
4126         assert(link->lease_file);
4127         assert(link->manager);
4128
4129         if (link->state == LINK_STATE_LINGER) {
4130                 (void) unlink(link->state_file);
4131                 return 0;
4132         }
4133
4134         link_lldp_save(link);
4135
4136         admin_state = link_state_to_string(link->state);
4137         assert(admin_state);
4138
4139         oper_state = link_operstate_to_string(link->operstate);
4140         assert(oper_state);
4141
4142         carrier_state = link_carrier_state_to_string(link->carrier_state);
4143         assert(carrier_state);
4144
4145         address_state = link_address_state_to_string(link->address_state);
4146         assert(address_state);
4147
4148         r = fopen_temporary(link->state_file, &f, &temp_path);
4149         if (r < 0)
4150                 goto fail;
4151
4152         (void) fchmod(fileno(f), 0644);
4153
4154         fprintf(f,
4155                 "# This is private data. Do not parse.\n"
4156                 "ADMIN_STATE=%s\n"
4157                 "OPER_STATE=%s\n"
4158                 "CARRIER_STATE=%s\n"
4159                 "ADDRESS_STATE=%s\n",
4160                 admin_state, oper_state, carrier_state, address_state);
4161
4162         if (link->network) {
4163                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4164                 const char *dhcp_domainname = NULL, *p;
4165                 sd_dhcp6_lease *dhcp6_lease = NULL;
4166                 bool space;
4167
4168                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4169                         yes_no(link->network->required_for_online));
4170
4171                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4172                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4173                         strempty(link_operstate_to_string(st.min)),
4174                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4175                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4176
4177                 if (link->dhcp6_client) {
4178                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4179                         if (r < 0 && r != -ENOMSG)
4180                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4181                 }
4182
4183                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4184
4185                 /************************************************************/
4186
4187                 fputs("DNS=", f);
4188                 space = false;
4189                 if (link->n_dns != (unsigned) -1)
4190                         link_save_dns(f, link->dns, link->n_dns, &space);
4191                 else
4192                         link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4193
4194                 serialize_addresses(f, NULL, &space,
4195                                     NULL,
4196                                     link->dhcp_lease,
4197                                     link->network->dhcp_use_dns,
4198                                     SD_DHCP_LEASE_DNS,
4199                                     dhcp6_lease,
4200                                     link->network->dhcp6_use_dns,
4201                                     sd_dhcp6_lease_get_dns,
4202                                     NULL);
4203
4204                 /* Make sure to flush out old entries before we use the NDISC data */
4205                 ndisc_vacuum(link);
4206
4207                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4208                         NDiscRDNSS *dd;
4209
4210                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4211                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4212                 }
4213
4214                 fputc('\n', f);
4215
4216                 /************************************************************/
4217
4218                 serialize_addresses(f, "NTP", NULL,
4219                                     link->ntp ?: link->network->ntp,
4220                                     link->dhcp_lease,
4221                                     link->network->dhcp_use_ntp,
4222                                     SD_DHCP_LEASE_NTP,
4223                                     dhcp6_lease,
4224                                     link->network->dhcp6_use_ntp,
4225                                     sd_dhcp6_lease_get_ntp_addrs,
4226                                     sd_dhcp6_lease_get_ntp_fqdn);
4227
4228                 serialize_addresses(f, "SIP", NULL,
4229                                     NULL,
4230                                     link->dhcp_lease,
4231                                     link->network->dhcp_use_sip,
4232                                     SD_DHCP_LEASE_SIP,
4233                                     NULL, false, NULL, NULL);
4234
4235                 /************************************************************/
4236
4237                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4238                         if (link->dhcp_lease) {
4239                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4240                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4241                         }
4242                         if (dhcp6_lease)
4243                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4244                 }
4245
4246                 fputs("DOMAINS=", f);
4247                 space = false;
4248                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4249                         fputs_with_space(f, p, NULL, &space);
4250
4251                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4252                         if (dhcp_domainname)
4253                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4254                         if (dhcp_domains)
4255                                 fputstrv(f, dhcp_domains, NULL, &space);
4256                         if (dhcp6_domains)
4257                                 fputstrv(f, dhcp6_domains, NULL, &space);
4258                 }
4259
4260                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4261                         NDiscDNSSL *dd;
4262
4263                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4264                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4265                 }
4266
4267                 fputc('\n', f);
4268
4269                 /************************************************************/
4270
4271                 fputs("ROUTE_DOMAINS=", f);
4272                 space = false;
4273                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4274                         fputs_with_space(f, p, NULL, &space);
4275
4276                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4277                         if (dhcp_domainname)
4278                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4279                         if (dhcp_domains)
4280                                 fputstrv(f, dhcp_domains, NULL, &space);
4281                         if (dhcp6_domains)
4282                                 fputstrv(f, dhcp6_domains, NULL, &space);
4283                 }
4284
4285                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4286                         NDiscDNSSL *dd;
4287
4288                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4289                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4290                 }
4291
4292                 fputc('\n', f);
4293
4294                 /************************************************************/
4295
4296                 fprintf(f, "LLMNR=%s\n",
4297                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4298
4299                 /************************************************************/
4300
4301                 fprintf(f, "MDNS=%s\n",
4302                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4303
4304                 /************************************************************/
4305
4306                 int dns_default_route =
4307                         link->dns_default_route >= 0 ? link->dns_default_route :
4308                         link->network->dns_default_route;
4309                 if (dns_default_route >= 0)
4310                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4311
4312                 /************************************************************/
4313
4314                 DnsOverTlsMode dns_over_tls_mode =
4315                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4316                         link->network->dns_over_tls_mode;
4317                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4318                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4319
4320                 /************************************************************/
4321
4322                 DnssecMode dnssec_mode =
4323                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4324                         link->network->dnssec_mode;
4325                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4326                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4327
4328                 /************************************************************/
4329
4330                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4331                 if (set_isempty(nta_anchors))
4332                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4333
4334                 if (!set_isempty(nta_anchors)) {
4335                         const char *n;
4336
4337                         fputs("DNSSEC_NTA=", f);
4338                         space = false;
4339                         SET_FOREACH(n, nta_anchors, i)
4340                                 fputs_with_space(f, n, NULL, &space);
4341                         fputc('\n', f);
4342                 }
4343
4344                 /************************************************************/
4345
4346                 fputs("ADDRESSES=", f);
4347                 space = false;
4348                 SET_FOREACH(a, link->addresses, i) {
4349                         _cleanup_free_ char *address_str = NULL;
4350
4351                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4352                         if (r < 0)
4353                                 goto fail;
4354
4355                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4356                         space = true;
4357                 }
4358                 fputc('\n', f);
4359
4360                 /************************************************************/
4361
4362                 fputs("ROUTES=", f);
4363                 space = false;
4364                 SET_FOREACH(route, link->routes, i) {
4365                         _cleanup_free_ char *route_str = NULL;
4366
4367                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4368                         if (r < 0)
4369                                 goto fail;
4370
4371                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4372                                 space ? " " : "", route_str,
4373                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4374                         space = true;
4375                 }
4376
4377                 fputc('\n', f);
4378         }
4379
4380         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4381         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4382
4383         if (link->dhcp_lease) {
4384                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4385                 if (r < 0)
4386                         goto fail;
4387
4388                 fprintf(f,
4389                         "DHCP_LEASE=%s\n",
4390                         link->lease_file);
4391         } else
4392                 (void) unlink(link->lease_file);
4393
4394         if (link->ipv4ll) {
4395                 struct in_addr address;
4396
4397                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4398                 if (r >= 0) {
4399                         fputs("IPV4LL_ADDRESS=", f);
4400                         serialize_in_addrs(f, &address, 1, false, NULL);
4401                         fputc('\n', f);
4402                 }
4403         }
4404
4405         if (link->dhcp6_client) {
4406                 _cleanup_free_ char *duid = NULL;
4407                 uint32_t iaid;
4408
4409                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4410                 if (r >= 0)
4411                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4412
4413                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4414                 if (r >= 0)
4415                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4416         }
4417
4418         r = fflush_and_check(f);
4419         if (r < 0)
4420                 goto fail;
4421
4422         if (rename(temp_path, link->state_file) < 0) {
4423                 r = -errno;
4424                 goto fail;
4425         }
4426
4427         return 0;
4428
4429 fail:
4430         (void) unlink(link->state_file);
4431         if (temp_path)
4432                 (void) unlink(temp_path);
4433
4434         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4435 }
4436
4437 /* The serialized state in /run is no longer up-to-date. */
4438 void link_dirty(Link *link) {
4439         int r;
4440
4441         assert(link);
4442
4443         /* mark manager dirty as link is dirty */
4444         manager_dirty(link->manager);
4445
4446         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4447         if (r <= 0)
4448                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4449                 return;
4450         link_ref(link);
4451 }
4452
4453 /* The serialized state in /run is up-to-date */
4454 void link_clean(Link *link) {
4455         assert(link);
4456         assert(link->manager);
4457
4458         link_unref(set_remove(link->manager->dirty_links, link));
4459 }
4460
4461 static const char* const link_state_table[_LINK_STATE_MAX] = {
4462         [LINK_STATE_PENDING] = "pending",
4463         [LINK_STATE_INITIALIZED] = "initialized",
4464         [LINK_STATE_CONFIGURING] = "configuring",
4465         [LINK_STATE_CONFIGURED] = "configured",
4466         [LINK_STATE_UNMANAGED] = "unmanaged",
4467         [LINK_STATE_FAILED] = "failed",
4468         [LINK_STATE_LINGER] = "linger",
4469 };
4470
4471 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4472
4473 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4474         const char *err_msg = NULL;
4475
4476         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4477         return log_link_full(link, level, err,
4478                              "%s: %s%s%s%m",
4479                              msg,
4480                              strempty(err_msg),
4481                              err_msg && !endswith(err_msg, ".") ? "." : "",
4482                              err_msg ? " " : "");
4483 }