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         bool keep_dhcp = may_keep_dhcp &&
 804                          link->network &&
 805                          (link->manager->restarting ||
 806                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 807
 808         if (link->dhcp_client && !keep_dhcp) {
 809                 k = sd_dhcp_client_stop(link->dhcp_client);
 810                 if (k < 0)
 811                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 812         }
 813
 814         if (link->ipv4ll) {
 815                 k = sd_ipv4ll_stop(link->ipv4ll);
 816                 if (k < 0)
 817                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 818         }
 819
 820         if (link->network)
 821                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 822                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 823                                 k = sd_ipv4acd_stop(ad->acd);
 824                                 if (k < 0)
 825                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 826                         }
 827
 828         if (link->dhcp6_client) {
 829                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 830                 if (k < 0)
 831                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 832         }
 833
 834         if (link->ndisc) {
 835                 k = sd_ndisc_stop(link->ndisc);
 836                 if (k < 0)
 837                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 838         }
 839
 840         if (link->radv) {
 841                 k = sd_radv_stop(link->radv);
 842                 if (k < 0)
 843                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 844         }
 845
 846         link_lldp_emit_stop(link);
 847         return r;
 848 }
 849
 850 void link_enter_failed(Link *link) {
 851         assert(link);
 852
 853         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 854                 return;
 855
 856         log_link_warning(link, "Failed");
 857
 858         link_set_state(link, LINK_STATE_FAILED);
 859
 860         link_stop_clients(link, false);
 861
 862         link_dirty(link);
 863 }
 864
 865 static int link_join_netdevs_after_configured(Link *link) {
 866         NetDev *netdev;
 867         Iterator i;
 868         int r;
 869
 870         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 871                 if (netdev->ifindex > 0)
 872                         /* Assume already enslaved. */
 873                         continue;
 874
 875                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 876                         continue;
 877
 878                 log_struct(LOG_DEBUG,
 879                            LOG_LINK_INTERFACE(link),
 880                            LOG_NETDEV_INTERFACE(netdev),
 881                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 882
 883                 r = netdev_join(netdev, link, NULL);
 884                 if (r < 0)
 885                         return log_struct_errno(LOG_WARNING, r,
 886                                                 LOG_LINK_INTERFACE(link),
 887                                                 LOG_NETDEV_INTERFACE(netdev),
 888                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 889         }
 890
 891         return 0;
 892 }
 893
 894 static void link_enter_configured(Link *link) {
 895         assert(link);
 896         assert(link->network);
 897
 898         if (link->state != LINK_STATE_CONFIGURING)
 899                 return;
 900
 901         link_set_state(link, LINK_STATE_CONFIGURED);
 902
 903         (void) link_join_netdevs_after_configured(link);
 904
 905         link_dirty(link);
 906 }
 907
 908 static int link_request_set_routing_policy_rule(Link *link) {
 909         RoutingPolicyRule *rule, *rrule = NULL;
 910         int r;
 911
 912         assert(link);
 913         assert(link->network);
 914
 915         link->routing_policy_rules_configured = false;
 916
 917         LIST_FOREACH(rules, rule, link->network->rules) {
 918                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 919                 if (r >= 0) {
 920                         if (r == 0)
 921                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 922                         continue;
 923                 }
 924
 925                 r = routing_policy_rule_configure(rule, link, NULL);
 926                 if (r < 0)
 927                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 928                 if (r > 0)
 929                         link->routing_policy_rule_messages++;
 930         }
 931
 932         routing_policy_rule_purge(link->manager, link);
 933         if (link->routing_policy_rule_messages == 0)
 934                 link->routing_policy_rules_configured = true;
 935         else {
 936                 log_link_debug(link, "Setting routing policy rules");
 937                 link_set_state(link, LINK_STATE_CONFIGURING);
 938         }
 939
 940         return 0;
 941 }
 942
 943 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 944         int r;
 945
 946         assert(link);
 947         assert(link->nexthop_messages > 0);
 948         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 949                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 950
 951         link->nexthop_messages--;
 952
 953         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 954                 return 1;
 955
 956         r = sd_netlink_message_get_errno(m);
 957         if (r < 0 && r != -EEXIST) {
 958                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 959                 link_enter_failed(link);
 960                 return 1;
 961         }
 962
 963         if (link->nexthop_messages == 0) {
 964                 log_link_debug(link, "Nexthop set");
 965                 link->static_nexthops_configured = true;
 966                 link_check_ready(link);
 967         }
 968
 969         return 1;
 970 }
 971
 972 static int link_request_set_nexthop(Link *link) {
 973         NextHop *nh;
 974         int r;
 975
 976         link->static_nexthops_configured = false;
 977
 978         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 979                 r = nexthop_configure(nh, link, nexthop_handler);
 980                 if (r < 0)
 981                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 982                 if (r > 0)
 983                         link->nexthop_messages++;
 984         }
 985
 986         if (link->nexthop_messages == 0) {
 987                 link->static_nexthops_configured = true;
 988                 link_check_ready(link);
 989         } else {
 990                 log_link_debug(link, "Setting nexthop");
 991                 link_set_state(link, LINK_STATE_CONFIGURING);
 992         }
 993
 994         return 1;
 995 }
 996
 997 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 998         int r;
 999
1000         assert(link);
1001         assert(link->route_messages > 0);
1002         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1003                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1004
1005         link->route_messages--;
1006
1007         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1008                 return 1;
1009
1010         r = sd_netlink_message_get_errno(m);
1011         if (r < 0 && r != -EEXIST) {
1012                 log_link_message_warning_errno(link, m, r, "Could not set route");
1013                 link_enter_failed(link);
1014                 return 1;
1015         }
1016
1017         if (link->route_messages == 0) {
1018                 log_link_debug(link, "Routes set");
1019                 link->static_routes_configured = true;
1020                 link_request_set_nexthop(link);
1021         }
1022
1023         return 1;
1024 }
1025
1026 int link_request_set_routes(Link *link) {
1027         enum {
1028                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1029                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1030                 _PHASE_MAX
1031         } phase;
1032         Route *rt;
1033         int r;
1034
1035         assert(link);
1036         assert(link->network);
1037         assert(link->addresses_configured);
1038         assert(link->address_messages == 0);
1039         assert(link->state != _LINK_STATE_INVALID);
1040
1041         link->static_routes_configured = false;
1042
1043         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1044                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1045                  * the addresses now, let's not configure the routes either. */
1046                 return 0;
1047
1048         r = link_request_set_routing_policy_rule(link);
1049         if (r < 0)
1050                 return r;
1051
1052         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1053         for (phase = 0; phase < _PHASE_MAX; phase++)
1054                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1055                         if (rt->gateway_from_dhcp)
1056                                 continue;
1057
1058                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1059                                 continue;
1060
1061                         r = route_configure(rt, link, route_handler);
1062                         if (r < 0)
1063                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1064                         if (r > 0)
1065                                 link->route_messages++;
1066                 }
1067
1068         if (link->route_messages == 0) {
1069                 link->static_routes_configured = true;
1070                 link_request_set_nexthop(link);
1071         } else {
1072                 log_link_debug(link, "Setting routes");
1073                 link_set_state(link, LINK_STATE_CONFIGURING);
1074         }
1075
1076         return 0;
1077 }
1078
1079 void link_check_ready(Link *link) {
1080         Address *a;
1081         Iterator i;
1082         int r;
1083
1084         assert(link);
1085
1086         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1087                 log_link_debug(link, "%s(): link is in failed or linger state.", __func__);
1088                 return;
1089         }
1090
1091         if (!link->network)
1092                 return;
1093
1094         if (!link->addresses_configured) {
1095                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1096                 return;
1097         }
1098
1099         if (!link->neighbors_configured) {
1100                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1101                 return;
1102         }
1103
1104         SET_FOREACH(a, link->addresses, i)
1105                 if (!address_is_ready(a)) {
1106                         _cleanup_free_ char *str = NULL;
1107
1108                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1109                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1110                         return;
1111                 }
1112
1113         if (!link->addresses_ready) {
1114                 link->addresses_ready = true;
1115                 r = link_request_set_routes(link);
1116                 if (r < 0)
1117                         link_enter_failed(link);
1118                 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1119                 return;
1120         }
1121
1122         if (!link->static_routes_configured) {
1123                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1124                 return;
1125         }
1126
1127         if (!link->static_nexthops_configured) {
1128                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1129                 return;
1130         }
1131
1132         if (!link->routing_policy_rules_configured) {
1133                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1134                 return;
1135         }
1136
1137         if (!link->tc_configured) {
1138                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1139                 return;
1140         }
1141
1142         if (!link->sr_iov_configured) {
1143                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1144                 return;
1145         }
1146
1147         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1148
1149                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address) {
1150                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1151                         return;
1152                 }
1153
1154                 if (link_ipv6ll_enabled(link) &&
1155                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1156                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1157                         return;
1158                 }
1159
1160                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && set_isempty(link->addresses)) {
1161                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no address is assigned yet.", __func__);
1162                         return;
1163                 }
1164
1165                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
1166                         if (!link->dhcp4_configured &&
1167                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1168                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1169                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1170                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address)) {
1171                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1172                                  * an IPv4ll fallback address must be configured. */
1173                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1174                                 return;
1175                         }
1176
1177                         log_link_debug(link, "%s(): dhcp4:%s dhcp6_addresses:%s dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
1178                                        __func__,
1179                                        yes_no(link->dhcp4_configured),
1180                                        yes_no(link->dhcp6_address_configured),
1181                                        yes_no(link->dhcp6_route_configured),
1182                                        yes_no(link->dhcp6_pd_address_configured),
1183                                        yes_no(link->dhcp6_pd_route_configured),
1184                                        yes_no(link->ndisc_addresses_configured),
1185                                        yes_no(link->ndisc_routes_configured));
1186                 }
1187         }
1188
1189         if (link->state != LINK_STATE_CONFIGURED)
1190                 link_enter_configured(link);
1191
1192         return;
1193 }
1194
1195 static int link_request_set_neighbors(Link *link) {
1196         Neighbor *neighbor;
1197         int r;
1198
1199         assert(link);
1200         assert(link->network);
1201         assert(link->state != _LINK_STATE_INVALID);
1202
1203         link->neighbors_configured = false;
1204
1205         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1206                 r = neighbor_configure(neighbor, link, NULL);
1207                 if (r < 0)
1208                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1209         }
1210
1211         if (link->neighbor_messages == 0) {
1212                 link->neighbors_configured = true;
1213                 link_check_ready(link);
1214         } else {
1215                 log_link_debug(link, "Setting neighbors");
1216                 link_set_state(link, LINK_STATE_CONFIGURING);
1217         }
1218
1219         return 0;
1220 }
1221
1222 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1223         int r;
1224
1225         assert(rtnl);
1226         assert(m);
1227         assert(link);
1228         assert(link->ifname);
1229         assert(link->address_messages > 0);
1230         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1231                LINK_STATE_FAILED, LINK_STATE_LINGER));
1232
1233         link->address_messages--;
1234
1235         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1236                 return 1;
1237
1238         r = sd_netlink_message_get_errno(m);
1239         if (r < 0 && r != -EEXIST) {
1240                 log_link_message_warning_errno(link, m, r, "Could not set address");
1241                 link_enter_failed(link);
1242                 return 1;
1243         } else if (r >= 0)
1244                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1245
1246         if (link->address_messages == 0) {
1247                 log_link_debug(link, "Addresses set");
1248                 link->addresses_configured = true;
1249                 link_check_ready(link);
1250         }
1251
1252         return 1;
1253 }
1254
1255 static int link_set_bridge_fdb(Link *link) {
1256         FdbEntry *fdb_entry;
1257         int r;
1258
1259         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1260                 r = fdb_entry_configure(link, fdb_entry);
1261                 if (r < 0)
1262                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1263         }
1264
1265         return 0;
1266 }
1267
1268 static int link_request_set_addresses(Link *link) {
1269         AddressLabel *label;
1270         Address *ad;
1271         Prefix *p;
1272         int r;
1273
1274         assert(link);
1275         assert(link->network);
1276         assert(link->state != _LINK_STATE_INVALID);
1277
1278         /* Reset all *_configured flags we are configuring. */
1279         link->addresses_configured = false;
1280         link->addresses_ready = false;
1281         link->neighbors_configured = false;
1282         link->static_routes_configured = false;
1283         link->static_nexthops_configured = false;
1284         link->routing_policy_rules_configured = false;
1285
1286         r = link_set_bridge_fdb(link);
1287         if (r < 0)
1288                 return r;
1289
1290         r = link_request_set_neighbors(link);
1291         if (r < 0)
1292                 return r;
1293
1294         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1295                 bool update;
1296
1297                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1298
1299                 r = address_configure(ad, link, address_handler, update);
1300                 if (r < 0)
1301                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1302                 if (r > 0)
1303                         link->address_messages++;
1304         }
1305
1306         if (IN_SET(link->network->router_prefix_delegation,
1307                    RADV_PREFIX_DELEGATION_STATIC,
1308                    RADV_PREFIX_DELEGATION_BOTH))
1309                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1310                         _cleanup_(address_freep) Address *address = NULL;
1311
1312                         if (!p->assign)
1313                                 continue;
1314
1315                         r = address_new(&address);
1316                         if (r < 0)
1317                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1318
1319                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1320                         if (r < 0)
1321                                 return r;
1322
1323                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1324                         if (r < 0)
1325                                 return r;
1326
1327                         address->family = AF_INET6;
1328                         r = address_configure(address, link, address_handler, true);
1329                         if (r < 0)
1330                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1331                         if (r > 0)
1332                                 link->address_messages++;
1333                 }
1334
1335         LIST_FOREACH(labels, label, link->network->address_labels) {
1336                 r = address_label_configure(label, link, NULL, false);
1337                 if (r < 0)
1338                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1339
1340                 link->address_label_messages++;
1341         }
1342
1343         /* now that we can figure out a default address for the dhcp server,
1344            start it */
1345         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1346                 r = dhcp4_server_configure(link);
1347                 if (r < 0)
1348                         return r;
1349                 log_link_debug(link, "Offering DHCPv4 leases");
1350         }
1351
1352         if (link->address_messages == 0) {
1353                 link->addresses_configured = true;
1354                 link_check_ready(link);
1355         } else {
1356                 log_link_debug(link, "Setting addresses");
1357                 link_set_state(link, LINK_STATE_CONFIGURING);
1358         }
1359
1360         return 0;
1361 }
1362
1363 static int link_set_bridge_vlan(Link *link) {
1364         int r;
1365
1366         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1367         if (r < 0)
1368                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1369
1370         return r;
1371 }
1372
1373 static int link_set_proxy_arp(Link *link) {
1374         int r;
1375
1376         if (!link_proxy_arp_enabled(link))
1377                 return 0;
1378
1379         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1380         if (r < 0)
1381                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1382
1383         return 0;
1384 }
1385
1386 static int link_configure_continue(Link *link);
1387
1388 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1389         int r;
1390
1391         assert(m);
1392         assert(link);
1393         assert(link->ifname);
1394
1395         link->setting_mtu = false;
1396
1397         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1398                 return 1;
1399
1400         r = sd_netlink_message_get_errno(m);
1401         if (r < 0)
1402                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1403         else
1404                 log_link_debug(link, "Setting MTU done.");
1405
1406         if (link->state == LINK_STATE_INITIALIZED) {
1407                 r = link_configure_continue(link);
1408                 if (r < 0)
1409                         link_enter_failed(link);
1410         }
1411
1412         return 1;
1413 }
1414
1415 int link_set_mtu(Link *link, uint32_t mtu) {
1416         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1417         int r;
1418
1419         assert(link);
1420         assert(link->manager);
1421         assert(link->manager->rtnl);
1422
1423         if (mtu == 0 || link->setting_mtu)
1424                 return 0;
1425
1426         if (link->mtu == mtu)
1427                 return 0;
1428
1429         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1430
1431         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1432         if (r < 0)
1433                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1434
1435         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1436          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1437         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1438
1439                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1440                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1441
1442                 mtu = IPV6_MIN_MTU;
1443         }
1444
1445         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1446         if (r < 0)
1447                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1448
1449         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1450                                link_netlink_destroy_callback, link);
1451         if (r < 0)
1452                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1453
1454         link_ref(link);
1455         link->setting_mtu = true;
1456
1457         return 0;
1458 }
1459
1460 static bool link_reduces_vlan_mtu(Link *link) {
1461         /* See netif_reduces_vlan_mtu() in kernel. */
1462         return streq_ptr(link->kind, "macsec");
1463 }
1464
1465 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1466         uint32_t mtu = 0;
1467         NetDev *dev;
1468         Iterator i;
1469
1470         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1471                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1472                         /* See vlan_dev_change_mtu() in kernel. */
1473                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1474
1475                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1476                         /* See macvlan_change_mtu() in kernel. */
1477                         mtu = dev->mtu;
1478
1479         return mtu;
1480 }
1481
1482 static int link_configure_mtu(Link *link) {
1483         uint32_t mtu;
1484
1485         assert(link);
1486         assert(link->network);
1487
1488         if (link->network->mtu > 0)
1489                 return link_set_mtu(link, link->network->mtu);
1490
1491         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1492         if (link->mtu >= mtu)
1493                 return 0;
1494
1495         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1496                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1497                         link->mtu, mtu);
1498
1499         return link_set_mtu(link, mtu);
1500 }
1501
1502 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1503         int r;
1504
1505         assert(m);
1506         assert(link);
1507         assert(link->ifname);
1508
1509         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1510                 return 1;
1511
1512         r = sd_netlink_message_get_errno(m);
1513         if (r < 0)
1514                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1515
1516         return 1;
1517 }
1518
1519 static int link_set_flags(Link *link) {
1520         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1521         unsigned ifi_change = 0;
1522         unsigned ifi_flags = 0;
1523         int r;
1524
1525         assert(link);
1526         assert(link->manager);
1527         assert(link->manager->rtnl);
1528
1529         if (link->flags & IFF_LOOPBACK)
1530                 return 0;
1531
1532         if (!link->network)
1533                 return 0;
1534
1535         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1536                 return 0;
1537
1538         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1539         if (r < 0)
1540                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1541
1542         if (link->network->arp >= 0) {
1543                 ifi_change |= IFF_NOARP;
1544                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1545         }
1546
1547         if (link->network->multicast >= 0) {
1548                 ifi_change |= IFF_MULTICAST;
1549                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1550         }
1551
1552         if (link->network->allmulticast >= 0) {
1553                 ifi_change |= IFF_ALLMULTI;
1554                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1555         }
1556
1557         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1558         if (r < 0)
1559                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1560
1561         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1562                                link_netlink_destroy_callback, link);
1563         if (r < 0)
1564                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1565
1566         link_ref(link);
1567
1568         return 0;
1569 }
1570
1571 static int link_acquire_ipv6_conf(Link *link) {
1572         int r;
1573
1574         assert(link);
1575
1576         if (link_ipv6_accept_ra_enabled(link)) {
1577                 assert(link->ndisc);
1578
1579                 log_link_debug(link, "Discovering IPv6 routers");
1580
1581                 r = sd_ndisc_start(link->ndisc);
1582                 if (r < 0 && r != -EBUSY)
1583                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1584         }
1585
1586         if (link_radv_enabled(link)) {
1587                 assert(link->radv);
1588                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1589
1590                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1591
1592                 r = radv_emit_dns(link);
1593                 if (r < 0)
1594                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1595
1596                 r = sd_radv_start(link->radv);
1597                 if (r < 0 && r != -EBUSY)
1598                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1599         }
1600
1601         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1602                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1603                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1604                 assert(link->dhcp6_client);
1605                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1606
1607                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1608                 if (r < 0 && r != -EBUSY)
1609                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1610                 else
1611                         log_link_debug(link, "Acquiring DHCPv6 lease");
1612         }
1613
1614         (void) dhcp6_request_prefix_delegation(link);
1615
1616         return 0;
1617 }
1618
1619 static int link_acquire_ipv4_conf(Link *link) {
1620         int r;
1621
1622         assert(link);
1623         assert(link->manager);
1624         assert(link->manager->event);
1625
1626         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1627                 assert(link->ipv4ll);
1628
1629                 log_link_debug(link, "Acquiring IPv4 link-local address");
1630
1631                 r = sd_ipv4ll_start(link->ipv4ll);
1632                 if (r < 0)
1633                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1634         }
1635
1636         if (link_dhcp4_enabled(link)) {
1637                 assert(link->dhcp_client);
1638
1639                 log_link_debug(link, "Acquiring DHCPv4 lease");
1640
1641                 r = sd_dhcp_client_start(link->dhcp_client);
1642                 if (r < 0)
1643                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1644         }
1645
1646         return 0;
1647 }
1648
1649 static int link_acquire_conf(Link *link) {
1650         int r;
1651
1652         assert(link);
1653
1654         r = link_acquire_ipv4_conf(link);
1655         if (r < 0)
1656                 return r;
1657
1658         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1659                 r = link_acquire_ipv6_conf(link);
1660                 if (r < 0)
1661                         return r;
1662         }
1663
1664         if (link_lldp_emit_enabled(link)) {
1665                 r = link_lldp_emit_start(link);
1666                 if (r < 0)
1667                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1668         }
1669
1670         return 0;
1671 }
1672
1673 bool link_has_carrier(Link *link) {
1674         /* see Documentation/networking/operstates.txt in the kernel sources */
1675
1676         if (link->kernel_operstate == IF_OPER_UP)
1677                 return true;
1678
1679         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1680                 /* operstate may not be implemented, so fall back to flags */
1681                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1682                     !FLAGS_SET(link->flags, IFF_DORMANT))
1683                         return true;
1684
1685         return false;
1686 }
1687
1688 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1689         int r;
1690
1691         assert(link);
1692
1693         link->setting_genmode = false;
1694
1695         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1696                 return 1;
1697
1698         r = sd_netlink_message_get_errno(m);
1699         if (r < 0)
1700                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1701         else
1702                 log_link_debug(link, "Setting address genmode done.");
1703
1704         if (link->state == LINK_STATE_INITIALIZED) {
1705                 r = link_configure_continue(link);
1706                 if (r < 0)
1707                         link_enter_failed(link);
1708         }
1709
1710         return 1;
1711 }
1712
1713 static int link_configure_addrgen_mode(Link *link) {
1714         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1715         uint8_t ipv6ll_mode;
1716         int r;
1717
1718         assert(link);
1719         assert(link->network);
1720         assert(link->manager);
1721         assert(link->manager->rtnl);
1722
1723         if (!socket_ipv6_is_supported() || link->setting_genmode)
1724                 return 0;
1725
1726         log_link_debug(link, "Setting address genmode for link");
1727
1728         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1729         if (r < 0)
1730                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1731
1732         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1733         if (r < 0)
1734                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1735
1736         r = sd_netlink_message_open_container(req, AF_INET6);
1737         if (r < 0)
1738                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1739
1740         if (!link_ipv6ll_enabled(link))
1741                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1742         else if (link->network->ipv6ll_address_gen_mode < 0) {
1743                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1744                 if (r < 0) {
1745                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1746                          * reading the file fails with EIO. */
1747                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1748
1749                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1750                 } else
1751                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1752         } else
1753                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1754
1755         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1756         if (r < 0)
1757                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1758
1759         r = sd_netlink_message_close_container(req);
1760         if (r < 0)
1761                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1762
1763         r = sd_netlink_message_close_container(req);
1764         if (r < 0)
1765                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1766
1767         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1768                                link_netlink_destroy_callback, link);
1769         if (r < 0)
1770                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1771
1772         link_ref(link);
1773         link->setting_genmode = true;
1774
1775         return 0;
1776 }
1777
1778 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1779         int r;
1780
1781         assert(link);
1782
1783         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1784                 return 1;
1785
1786         r = sd_netlink_message_get_errno(m);
1787         if (r < 0)
1788                 /* we warn but don't fail the link, as it may be brought up later */
1789                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1790
1791         return 1;
1792 }
1793
1794 static int link_up(Link *link) {
1795         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1796         int r;
1797
1798         assert(link);
1799         assert(link->network);
1800         assert(link->manager);
1801         assert(link->manager->rtnl);
1802
1803         log_link_debug(link, "Bringing link up");
1804
1805         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1806         if (r < 0)
1807                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1808
1809         /* set it free if not enslaved with networkd */
1810         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1811                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1812                 if (r < 0)
1813                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1814         }
1815
1816         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1817         if (r < 0)
1818                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1819
1820         if (link->network->mac) {
1821                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1822                 if (r < 0)
1823                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1824         }
1825
1826         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1827                                link_netlink_destroy_callback, link);
1828         if (r < 0)
1829                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1830
1831         link_ref(link);
1832
1833         return 0;
1834 }
1835
1836 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1837         int r;
1838
1839         assert(link);
1840
1841         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1842                 return 1;
1843
1844         r = sd_netlink_message_get_errno(m);
1845         if (r < 0)
1846                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1847
1848         return 1;
1849 }
1850
1851 int link_down(Link *link, link_netlink_message_handler_t callback) {
1852         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1853         int r;
1854
1855         assert(link);
1856         assert(link->manager);
1857         assert(link->manager->rtnl);
1858
1859         log_link_debug(link, "Bringing link down");
1860
1861         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1862                                      RTM_SETLINK, link->ifindex);
1863         if (r < 0)
1864                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1865
1866         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1867         if (r < 0)
1868                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1869
1870         r = netlink_call_async(link->manager->rtnl, NULL, req,
1871                                callback ?: link_down_handler,
1872                                link_netlink_destroy_callback, link);
1873         if (r < 0)
1874                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1875
1876         link_ref(link);
1877
1878         return 0;
1879 }
1880
1881 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1882         int r;
1883
1884         assert(link);
1885
1886         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1887                 return 1;
1888
1889         r = sd_netlink_message_get_errno(m);
1890         if (r < 0)
1891                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1892
1893         return 1;
1894 }
1895
1896 static int link_set_group(Link *link) {
1897         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1898         int r;
1899
1900         assert(link);
1901         assert(link->network);
1902         assert(link->manager);
1903         assert(link->manager->rtnl);
1904
1905         if (link->network->group <= 0)
1906                 return 0;
1907
1908         log_link_debug(link, "Setting group");
1909
1910         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1911         if (r < 0)
1912                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1913
1914         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1915         if (r < 0)
1916                 return log_link_error_errno(link, r, "Could not set link group: %m");
1917
1918         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1919                                link_netlink_destroy_callback, link);
1920         if (r < 0)
1921                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1922
1923         link_ref(link);
1924
1925         return 0;
1926 }
1927
1928 static int link_handle_bound_to_list(Link *link) {
1929         Link *l;
1930         Iterator i;
1931         int r;
1932         bool required_up = false;
1933         bool link_is_up = false;
1934
1935         assert(link);
1936
1937         if (hashmap_isempty(link->bound_to_links))
1938                 return 0;
1939
1940         if (link->flags & IFF_UP)
1941                 link_is_up = true;
1942
1943         HASHMAP_FOREACH (l, link->bound_to_links, i)
1944                 if (link_has_carrier(l)) {
1945                         required_up = true;
1946                         break;
1947                 }
1948
1949         if (!required_up && link_is_up) {
1950                 r = link_down(link, NULL);
1951                 if (r < 0)
1952                         return r;
1953         } else if (required_up && !link_is_up) {
1954                 r = link_up(link);
1955                 if (r < 0)
1956                         return r;
1957         }
1958
1959         return 0;
1960 }
1961
1962 static int link_handle_bound_by_list(Link *link) {
1963         Iterator i;
1964         Link *l;
1965         int r;
1966
1967         assert(link);
1968
1969         if (hashmap_isempty(link->bound_by_links))
1970                 return 0;
1971
1972         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1973                 r = link_handle_bound_to_list(l);
1974                 if (r < 0)
1975                         return r;
1976         }
1977
1978         return 0;
1979 }
1980
1981 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1982         int r;
1983
1984         assert(link);
1985         assert(carrier);
1986
1987         if (link == carrier)
1988                 return 0;
1989
1990         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1991                 return 0;
1992
1993         r = hashmap_ensure_allocated(h, NULL);
1994         if (r < 0)
1995                 return r;
1996
1997         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1998         if (r < 0)
1999                 return r;
2000
2001         return 0;
2002 }
2003
2004 static int link_new_bound_by_list(Link *link) {
2005         Manager *m;
2006         Link *carrier;
2007         Iterator i;
2008         int r;
2009         bool list_updated = false;
2010
2011         assert(link);
2012         assert(link->manager);
2013
2014         m = link->manager;
2015
2016         HASHMAP_FOREACH(carrier, m->links, i) {
2017                 if (!carrier->network)
2018                         continue;
2019
2020                 if (strv_isempty(carrier->network->bind_carrier))
2021                         continue;
2022
2023                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2024                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2025                         if (r < 0)
2026                                 return r;
2027
2028                         list_updated = true;
2029                 }
2030         }
2031
2032         if (list_updated)
2033                 link_dirty(link);
2034
2035         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2036                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2037                 if (r < 0)
2038                         return r;
2039
2040                 link_dirty(carrier);
2041         }
2042
2043         return 0;
2044 }
2045
2046 static int link_new_bound_to_list(Link *link) {
2047         Manager *m;
2048         Link *carrier;
2049         Iterator i;
2050         int r;
2051         bool list_updated = false;
2052
2053         assert(link);
2054         assert(link->manager);
2055
2056         if (!link->network)
2057                 return 0;
2058
2059         if (strv_isempty(link->network->bind_carrier))
2060                 return 0;
2061
2062         m = link->manager;
2063
2064         HASHMAP_FOREACH (carrier, m->links, i) {
2065                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2066                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2067                         if (r < 0)
2068                                 return r;
2069
2070                         list_updated = true;
2071                 }
2072         }
2073
2074         if (list_updated)
2075                 link_dirty(link);
2076
2077         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2078                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2079                 if (r < 0)
2080                         return r;
2081
2082                 link_dirty(carrier);
2083         }
2084
2085         return 0;
2086 }
2087
2088 static int link_new_carrier_maps(Link *link) {
2089         int r;
2090
2091         r = link_new_bound_by_list(link);
2092         if (r < 0)
2093                 return r;
2094
2095         r = link_handle_bound_by_list(link);
2096         if (r < 0)
2097                 return r;
2098
2099         r = link_new_bound_to_list(link);
2100         if (r < 0)
2101                 return r;
2102
2103         r = link_handle_bound_to_list(link);
2104         if (r < 0)
2105                 return r;
2106
2107         return 0;
2108 }
2109
2110 static void link_free_bound_to_list(Link *link) {
2111         Link *bound_to;
2112         Iterator i;
2113
2114         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2115                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2116
2117                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2118                         link_dirty(bound_to);
2119         }
2120
2121         return;
2122 }
2123
2124 static void link_free_bound_by_list(Link *link) {
2125         Link *bound_by;
2126         Iterator i;
2127
2128         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2129                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2130
2131                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2132                         link_dirty(bound_by);
2133                         link_handle_bound_to_list(bound_by);
2134                 }
2135         }
2136
2137         return;
2138 }
2139
2140 static void link_free_carrier_maps(Link *link) {
2141         bool list_updated = false;
2142
2143         assert(link);
2144
2145         if (!hashmap_isempty(link->bound_to_links)) {
2146                 link_free_bound_to_list(link);
2147                 list_updated = true;
2148         }
2149
2150         if (!hashmap_isempty(link->bound_by_links)) {
2151                 link_free_bound_by_list(link);
2152                 list_updated = true;
2153         }
2154
2155         if (list_updated)
2156                 link_dirty(link);
2157
2158         return;
2159 }
2160
2161 static int link_append_to_master(Link *link, NetDev *netdev) {
2162         Link *master;
2163         int r;
2164
2165         assert(link);
2166         assert(netdev);
2167
2168         r = link_get(link->manager, netdev->ifindex, &master);
2169         if (r < 0)
2170                 return r;
2171
2172         r = set_ensure_put(&master->slaves, NULL, link);
2173         if (r <= 0)
2174                 return r;
2175
2176         link_ref(link);
2177         return 0;
2178 }
2179
2180 static void link_drop_from_master(Link *link, NetDev *netdev) {
2181         Link *master;
2182
2183         assert(link);
2184
2185         if (!link->manager || !netdev)
2186                 return;
2187
2188         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2189                 return;
2190
2191         link_unref(set_remove(master->slaves, link));
2192 }
2193
2194 static void link_detach_from_manager(Link *link) {
2195         if (!link || !link->manager)
2196                 return;
2197
2198         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2199         link_clean(link);
2200
2201         /* The following must be called at last. */
2202         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2203         link_unref(link);
2204 }
2205
2206 void link_drop(Link *link) {
2207         if (!link || link->state == LINK_STATE_LINGER)
2208                 return;
2209
2210         link_set_state(link, LINK_STATE_LINGER);
2211
2212         link_free_carrier_maps(link);
2213
2214         if (link->network) {
2215                 link_drop_from_master(link, link->network->bridge);
2216                 link_drop_from_master(link, link->network->bond);
2217         }
2218
2219         log_link_debug(link, "Link removed");
2220
2221         (void) unlink(link->state_file);
2222         link_detach_from_manager(link);
2223 }
2224
2225 static int link_joined(Link *link) {
2226         int r;
2227
2228         assert(link);
2229         assert(link->network);
2230
2231         if (!hashmap_isempty(link->bound_to_links)) {
2232                 r = link_handle_bound_to_list(link);
2233                 if (r < 0)
2234                         return r;
2235         } else if (!(link->flags & IFF_UP)) {
2236                 r = link_up(link);
2237                 if (r < 0) {
2238                         link_enter_failed(link);
2239                         return r;
2240                 }
2241         }
2242
2243         if (link->network->bridge) {
2244                 r = link_set_bridge(link);
2245                 if (r < 0)
2246                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2247
2248                 r = link_append_to_master(link, link->network->bridge);
2249                 if (r < 0)
2250                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2251         }
2252
2253         if (link->network->bond) {
2254                 r = link_set_bond(link);
2255                 if (r < 0)
2256                         log_link_error_errno(link, r, "Could not set bond message: %m");
2257
2258                 r = link_append_to_master(link, link->network->bond);
2259                 if (r < 0)
2260                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2261         }
2262
2263         if (link->network->use_br_vlan &&
2264             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2265                 r = link_set_bridge_vlan(link);
2266                 if (r < 0)
2267                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2268         }
2269
2270         /* Skip setting up addresses until it gets carrier,
2271            or it would try to set addresses twice,
2272            which is bad for non-idempotent steps. */
2273         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2274                 return 0;
2275
2276         link_set_state(link, LINK_STATE_CONFIGURING);
2277         return link_request_set_addresses(link);
2278 }
2279
2280 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2281         int r;
2282
2283         assert(link);
2284         assert(link->network);
2285         assert(link->enslaving > 0);
2286
2287         link->enslaving--;
2288
2289         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2290                 return 1;
2291
2292         r = sd_netlink_message_get_errno(m);
2293         if (r < 0 && r != -EEXIST) {
2294                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2295                 link_enter_failed(link);
2296                 return 1;
2297         }
2298
2299         log_link_debug(link, "Joined netdev");
2300
2301         if (link->enslaving == 0) {
2302                 r = link_joined(link);
2303                 if (r < 0)
2304                         link_enter_failed(link);
2305         }
2306
2307         return 1;
2308 }
2309
2310 static int link_enter_join_netdev(Link *link) {
2311         NetDev *netdev;
2312         Iterator i;
2313         int r;
2314
2315         assert(link);
2316         assert(link->network);
2317         assert(link->state == LINK_STATE_INITIALIZED);
2318
2319         link_set_state(link, LINK_STATE_CONFIGURING);
2320
2321         link_dirty(link);
2322         link->enslaving = 0;
2323
2324         if (link->network->bond) {
2325                 if (link->network->bond->state == NETDEV_STATE_READY &&
2326                     link->network->bond->ifindex == link->master_ifindex)
2327                         return link_joined(link);
2328
2329                 log_struct(LOG_DEBUG,
2330                            LOG_LINK_INTERFACE(link),
2331                            LOG_NETDEV_INTERFACE(link->network->bond),
2332                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2333
2334                 link->enslaving++;
2335
2336                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2337                 if (r < 0) {
2338                         log_struct_errno(LOG_WARNING, r,
2339                                          LOG_LINK_INTERFACE(link),
2340                                          LOG_NETDEV_INTERFACE(link->network->bond),
2341                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2342                         link_enter_failed(link);
2343                         return r;
2344                 }
2345         }
2346
2347         if (link->network->bridge) {
2348                 log_struct(LOG_DEBUG,
2349                            LOG_LINK_INTERFACE(link),
2350                            LOG_NETDEV_INTERFACE(link->network->bridge),
2351                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2352
2353                 link->enslaving++;
2354
2355                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2356                 if (r < 0) {
2357                         log_struct_errno(LOG_WARNING, r,
2358                                          LOG_LINK_INTERFACE(link),
2359                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2360                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2361                         link_enter_failed(link);
2362                         return r;
2363                 }
2364         }
2365
2366         if (link->network->vrf) {
2367                 log_struct(LOG_DEBUG,
2368                            LOG_LINK_INTERFACE(link),
2369                            LOG_NETDEV_INTERFACE(link->network->vrf),
2370                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2371
2372                 link->enslaving++;
2373
2374                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2375                 if (r < 0) {
2376                         log_struct_errno(LOG_WARNING, r,
2377                                          LOG_LINK_INTERFACE(link),
2378                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2379                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2380                         link_enter_failed(link);
2381                         return r;
2382                 }
2383         }
2384
2385         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2386
2387                 if (netdev->ifindex > 0)
2388                         /* Assume already enslaved. */
2389                         continue;
2390
2391                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2392                         continue;
2393
2394                 log_struct(LOG_DEBUG,
2395                            LOG_LINK_INTERFACE(link),
2396                            LOG_NETDEV_INTERFACE(netdev),
2397                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2398
2399                 link->enslaving++;
2400
2401                 r = netdev_join(netdev, link, netdev_join_handler);
2402                 if (r < 0) {
2403                         log_struct_errno(LOG_WARNING, r,
2404                                          LOG_LINK_INTERFACE(link),
2405                                          LOG_NETDEV_INTERFACE(netdev),
2406                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2407                         link_enter_failed(link);
2408                         return r;
2409                 }
2410         }
2411
2412         if (link->enslaving == 0)
2413                 return link_joined(link);
2414
2415         return 0;
2416 }
2417
2418 static int link_set_ipv4_forward(Link *link) {
2419         int r;
2420
2421         if (!link_ipv4_forward_enabled(link))
2422                 return 0;
2423
2424         /* We propagate the forwarding flag from one interface to the
2425          * global setting one way. This means: as long as at least one
2426          * interface was configured at any time that had IP forwarding
2427          * enabled the setting will stay on for good. We do this
2428          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2429          * somewhat in sync (see below). */
2430
2431         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2432         if (r < 0)
2433                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2434
2435         return 0;
2436 }
2437
2438 static int link_set_ipv6_forward(Link *link) {
2439         int r;
2440
2441         if (!link_ipv6_forward_enabled(link))
2442                 return 0;
2443
2444         /* On Linux, the IPv6 stack does not know a per-interface
2445          * packet forwarding setting: either packet forwarding is on
2446          * for all, or off for all. We hence don't bother with a
2447          * per-interface setting, but simply propagate the interface
2448          * flag, if it is set, to the global flag, one-way. Note that
2449          * while IPv4 would allow a per-interface flag, we expose the
2450          * same behaviour there and also propagate the setting from
2451          * one to all, to keep things simple (see above). */
2452
2453         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2454         if (r < 0)
2455                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2456
2457         return 0;
2458 }
2459
2460 static int link_set_ipv6_privacy_extensions(Link *link) {
2461         IPv6PrivacyExtensions s;
2462         int r;
2463
2464         s = link_ipv6_privacy_extensions(link);
2465         if (s < 0)
2466                 return 0;
2467
2468         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2469         if (r < 0)
2470                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2471
2472         return 0;
2473 }
2474
2475 static int link_set_ipv6_accept_ra(Link *link) {
2476         int r;
2477
2478         /* Make this a NOP if IPv6 is not available */
2479         if (!socket_ipv6_is_supported())
2480                 return 0;
2481
2482         if (link->flags & IFF_LOOPBACK)
2483                 return 0;
2484
2485         if (!link->network)
2486                 return 0;
2487
2488         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2489         if (r < 0)
2490                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2491
2492         return 0;
2493 }
2494
2495 static int link_set_ipv6_dad_transmits(Link *link) {
2496         int r;
2497
2498         /* Make this a NOP if IPv6 is not available */
2499         if (!socket_ipv6_is_supported())
2500                 return 0;
2501
2502         if (link->flags & IFF_LOOPBACK)
2503                 return 0;
2504
2505         if (!link->network)
2506                 return 0;
2507
2508         if (link->network->ipv6_dad_transmits < 0)
2509                 return 0;
2510
2511         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2512         if (r < 0)
2513                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2514
2515         return 0;
2516 }
2517
2518 static int link_set_ipv6_hop_limit(Link *link) {
2519         int r;
2520
2521         /* Make this a NOP if IPv6 is not available */
2522         if (!socket_ipv6_is_supported())
2523                 return 0;
2524
2525         if (link->flags & IFF_LOOPBACK)
2526                 return 0;
2527
2528         if (!link->network)
2529                 return 0;
2530
2531         if (link->network->ipv6_hop_limit < 0)
2532                 return 0;
2533
2534         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2535         if (r < 0)
2536                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2537
2538         return 0;
2539 }
2540
2541 static int link_set_ipv6_mtu(Link *link) {
2542         int r;
2543
2544         /* Make this a NOP if IPv6 is not available */
2545         if (!socket_ipv6_is_supported())
2546                 return 0;
2547
2548         if (link->flags & IFF_LOOPBACK)
2549                 return 0;
2550
2551         if (link->network->ipv6_mtu == 0)
2552                 return 0;
2553
2554         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2555          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2556         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2557                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2558                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2559         }
2560
2561         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2562         if (r < 0) {
2563                 if (link->mtu < link->network->ipv6_mtu)
2564                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2565                                          link->network->ipv6_mtu, link->mtu);
2566                 else
2567                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2568         }
2569
2570         link->ipv6_mtu_set = true;
2571
2572         return 0;
2573 }
2574
2575 static int link_set_ipv4_accept_local(Link *link) {
2576         int r;
2577
2578         if (link->flags & IFF_LOOPBACK)
2579                 return 0;
2580
2581         if (link->network->ipv4_accept_local < 0)
2582                 return 0;
2583
2584         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2585         if (r < 0)
2586                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2587
2588         return 0;
2589 }
2590
2591 static bool link_is_static_address_configured(Link *link, Address *address) {
2592         Address *net_address;
2593
2594         assert(link);
2595         assert(address);
2596
2597         if (!link->network)
2598                 return false;
2599
2600         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2601                 if (address_equal(net_address, address))
2602                         return true;
2603
2604         return false;
2605 }
2606
2607 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2608         Neighbor *net_neighbor;
2609
2610         assert(link);
2611         assert(neighbor);
2612
2613         if (!link->network)
2614                 return false;
2615
2616         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2617                 if (neighbor_equal(net_neighbor, neighbor))
2618                         return true;
2619
2620         return false;
2621 }
2622
2623 static bool link_is_static_route_configured(Link *link, Route *route) {
2624         Route *net_route;
2625
2626         assert(link);
2627         assert(route);
2628
2629         if (!link->network)
2630                 return false;
2631
2632         LIST_FOREACH(routes, net_route, link->network->static_routes)
2633                 if (route_equal(net_route, route))
2634                         return true;
2635
2636         return false;
2637 }
2638
2639 static bool link_address_is_dynamic(Link *link, Address *address) {
2640         Route *route;
2641         Iterator i;
2642
2643         assert(link);
2644         assert(address);
2645
2646         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2647                 return true;
2648
2649         /* Even when the address is leased from a DHCP server, networkd assign the address
2650          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2651          * corresponding routes with RTPROT_DHCP. */
2652         SET_FOREACH(route, link->routes_foreign, i) {
2653                 if (route->protocol != RTPROT_DHCP)
2654                         continue;
2655
2656                 if (address->family != route->family)
2657                         continue;
2658
2659                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2660                         return true;
2661         }
2662
2663         return false;
2664 }
2665
2666 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2667         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2668         sd_netlink_message *addr;
2669         int r;
2670
2671         assert(link);
2672         assert(link->manager);
2673         assert(link->manager->rtnl);
2674
2675         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2676         if (r < 0)
2677                 return r;
2678
2679         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2680         if (r < 0)
2681                 return r;
2682
2683         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2684                 unsigned char flags;
2685                 int ifindex;
2686
2687                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2688                 if (r < 0) {
2689                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2690                         continue;
2691                 } else if (link->ifindex != ifindex)
2692                         continue;
2693
2694                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2695                 if (r < 0) {
2696                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2697                         continue;
2698                 } else if (!(flags & IFA_F_TENTATIVE))
2699                         continue;
2700
2701                 log_link_debug(link, "Found tentative ipv6 link-local address");
2702                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2703         }
2704
2705         return 0;
2706 }
2707
2708 static int link_drop_foreign_config(Link *link) {
2709         Address *address;
2710         Neighbor *neighbor;
2711         Route *route;
2712         Iterator i;
2713         int r;
2714
2715         /* The kernel doesn't notify us about tentative addresses;
2716          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2717         if (!link_ipv6ll_enabled(link)) {
2718                 r = link_enumerate_ipv6_tentative_addresses(link);
2719                 if (r < 0)
2720                         return r;
2721         }
2722
2723         SET_FOREACH(address, link->addresses_foreign, i) {
2724                 /* we consider IPv6LL addresses to be managed by the kernel */
2725                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2726                         continue;
2727
2728                 if (link_address_is_dynamic(link, address)) {
2729                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2730                                 continue;
2731                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2732                         continue;
2733
2734                 if (link_is_static_address_configured(link, address)) {
2735                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2736                         if (r < 0)
2737                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2738                 } else {
2739                         r = address_remove(address, link, NULL);
2740                         if (r < 0)
2741                                 return r;
2742                 }
2743         }
2744
2745         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2746                 if (link_is_neighbor_configured(link, neighbor)) {
2747                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2748                         if (r < 0)
2749                                 return r;
2750                 } else {
2751                         r = neighbor_remove(neighbor, link, NULL);
2752                         if (r < 0)
2753                                 return r;
2754                 }
2755         }
2756
2757         SET_FOREACH(route, link->routes_foreign, i) {
2758                 /* do not touch routes managed by the kernel */
2759                 if (route->protocol == RTPROT_KERNEL)
2760                         continue;
2761
2762                 /* do not touch multicast route added by kernel */
2763                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2764                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2765                 if (route->protocol == RTPROT_BOOT &&
2766                     route->family == AF_INET6 &&
2767                     route->dst_prefixlen == 8 &&
2768                     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 }}} }))
2769                         continue;
2770
2771                 if (route->protocol == RTPROT_STATIC && link->network &&
2772                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2773                         continue;
2774
2775                 if (route->protocol == RTPROT_DHCP && link->network &&
2776                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2777                         continue;
2778
2779                 if (link_is_static_route_configured(link, route)) {
2780                         r = route_add(link, route, NULL);
2781                         if (r < 0)
2782                                 return r;
2783                 } else {
2784                         r = route_remove(route, link, NULL);
2785                         if (r < 0)
2786                                 return r;
2787                 }
2788         }
2789
2790         return 0;
2791 }
2792
2793 static int link_drop_config(Link *link) {
2794         Address *address, *pool_address;
2795         Neighbor *neighbor;
2796         Route *route;
2797         Iterator i;
2798         int r;
2799
2800         SET_FOREACH(address, link->addresses, i) {
2801                 /* we consider IPv6LL addresses to be managed by the kernel */
2802                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2803                         continue;
2804
2805                 r = address_remove(address, link, NULL);
2806                 if (r < 0)
2807                         return r;
2808
2809                 /* If this address came from an address pool, clean up the pool */
2810                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2811                         if (address_equal(address, pool_address)) {
2812                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2813                                 address_free(pool_address);
2814                                 break;
2815                         }
2816                 }
2817         }
2818
2819         SET_FOREACH(neighbor, link->neighbors, i) {
2820                 r = neighbor_remove(neighbor, link, NULL);
2821                 if (r < 0)
2822                         return r;
2823         }
2824
2825         SET_FOREACH(route, link->routes, i) {
2826                 /* do not touch routes managed by the kernel */
2827                 if (route->protocol == RTPROT_KERNEL)
2828                         continue;
2829
2830                 r = route_remove(route, link, NULL);
2831                 if (r < 0)
2832                         return r;
2833         }
2834
2835         ndisc_flush(link);
2836
2837         return 0;
2838 }
2839
2840 static int link_configure_ipv4_dad(Link *link) {
2841         Address *address;
2842         int r;
2843
2844         assert(link);
2845         assert(link->network);
2846
2847         LIST_FOREACH(addresses, address, link->network->static_addresses)
2848                 if (address->family == AF_INET &&
2849                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2850                         r = configure_ipv4_duplicate_address_detection(link, address);
2851                         if (r < 0)
2852                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2853                 }
2854
2855         return 0;
2856 }
2857
2858 static int link_configure_traffic_control(Link *link) {
2859         TrafficControl *tc;
2860         Iterator i;
2861         int r;
2862
2863         link->tc_configured = false;
2864         link->tc_messages = 0;
2865
2866         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2867                 r = traffic_control_configure(link, tc);
2868                 if (r < 0)
2869                         return r;
2870         }
2871
2872         if (link->tc_messages == 0)
2873                 link->tc_configured = true;
2874         else
2875                 log_link_debug(link, "Configuring traffic control");
2876
2877         return 0;
2878 }
2879
2880 static int link_configure_sr_iov(Link *link) {
2881         SRIOV *sr_iov;
2882         Iterator i;
2883         int r;
2884
2885         link->sr_iov_configured = false;
2886         link->sr_iov_messages = 0;
2887
2888         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2889                 r = sr_iov_configure(link, sr_iov);
2890                 if (r < 0)
2891                         return r;
2892         }
2893
2894         if (link->sr_iov_messages == 0)
2895                 link->sr_iov_configured = true;
2896         else
2897                 log_link_debug(link, "Configuring SR-IOV");
2898
2899         return 0;
2900 }
2901
2902 static int link_configure(Link *link) {
2903         int r;
2904
2905         assert(link);
2906         assert(link->network);
2907         assert(link->state == LINK_STATE_INITIALIZED);
2908
2909         r = link_configure_traffic_control(link);
2910         if (r < 0)
2911                 return r;
2912
2913         r = link_configure_sr_iov(link);
2914         if (r < 0)
2915                 return r;
2916
2917         if (link->iftype == ARPHRD_CAN)
2918                 return link_configure_can(link);
2919
2920         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2921          * for this interface, then enable IPv6 */
2922         (void) link_update_ipv6_sysctl(link);
2923
2924         r = link_set_proxy_arp(link);
2925         if (r < 0)
2926                return r;
2927
2928         r = ipv6_proxy_ndp_addresses_configure(link);
2929         if (r < 0)
2930                 return r;
2931
2932         r = link_set_ipv4_forward(link);
2933         if (r < 0)
2934                 return r;
2935
2936         r = link_set_ipv6_forward(link);
2937         if (r < 0)
2938                 return r;
2939
2940         r = link_set_ipv6_privacy_extensions(link);
2941         if (r < 0)
2942                 return r;
2943
2944         r = link_set_ipv6_accept_ra(link);
2945         if (r < 0)
2946                 return r;
2947
2948         r = link_set_ipv6_dad_transmits(link);
2949         if (r < 0)
2950                 return r;
2951
2952         r = link_set_ipv6_hop_limit(link);
2953         if (r < 0)
2954                 return r;
2955
2956         r = link_set_ipv4_accept_local(link);
2957         if (r < 0)
2958                 return r;
2959
2960         r = link_set_flags(link);
2961         if (r < 0)
2962                 return r;
2963
2964         r = link_set_group(link);
2965         if (r < 0)
2966                 return r;
2967
2968         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2969                 r = ipv4ll_configure(link);
2970                 if (r < 0)
2971                         return r;
2972         }
2973
2974         if (link_dhcp4_enabled(link)) {
2975                 r = dhcp4_set_promote_secondaries(link);
2976                 if (r < 0)
2977                         return r;
2978
2979                 r = dhcp4_configure(link);
2980                 if (r < 0)
2981                         return r;
2982         }
2983
2984         if (link_dhcp4_server_enabled(link)) {
2985                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2986                 if (r < 0)
2987                         return r;
2988
2989                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2990                 if (r < 0)
2991                         return r;
2992         }
2993
2994         if (link_dhcp6_enabled(link) ||
2995             link_ipv6_accept_ra_enabled(link)) {
2996                 r = dhcp6_configure(link);
2997                 if (r < 0)
2998                         return r;
2999         }
3000
3001         if (link_ipv6_accept_ra_enabled(link)) {
3002                 r = ndisc_configure(link);
3003                 if (r < 0)
3004                         return r;
3005         }
3006
3007         if (link_radv_enabled(link)) {
3008                 r = radv_configure(link);
3009                 if (r < 0)
3010                         return r;
3011         }
3012
3013         if (link_lldp_rx_enabled(link)) {
3014                 r = link_lldp_rx_configure(link);
3015                 if (r < 0)
3016                         return r;
3017         }
3018
3019         r = link_configure_mtu(link);
3020         if (r < 0)
3021                 return r;
3022
3023         r = link_configure_addrgen_mode(link);
3024         if (r < 0)
3025                 return r;
3026
3027         r = link_configure_ipv4_dad(link);
3028         if (r < 0)
3029                 return r;
3030
3031         return link_configure_continue(link);
3032 }
3033
3034 /* The configuration continues in this separate function, instead of
3035  * including this in the above link_configure() function, for two
3036  * reasons:
3037  * 1) some devices reset the link when the mtu is set, which caused
3038  *    an infinite loop here in networkd; see:
3039  *    https://github.com/systemd/systemd/issues/6593
3040  *    https://github.com/systemd/systemd/issues/9831
3041  * 2) if ipv6ll is disabled, then bringing the interface up must be
3042  *    delayed until after we get confirmation from the kernel that
3043  *    the addr_gen_mode parameter has been set (via netlink), see:
3044  *    https://github.com/systemd/systemd/issues/13882
3045  */
3046 static int link_configure_continue(Link *link) {
3047         int r;
3048
3049         assert(link);
3050         assert(link->network);
3051         assert(link->state == LINK_STATE_INITIALIZED);
3052
3053         if (link->setting_mtu || link->setting_genmode)
3054                 return 0;
3055
3056         /* Drop foreign config, but ignore loopback or critical devices.
3057          * We do not want to remove loopback address or addresses used for root NFS. */
3058         if (!(link->flags & IFF_LOOPBACK) &&
3059             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3060                 r = link_drop_foreign_config(link);
3061                 if (r < 0)
3062                         return r;
3063         }
3064
3065         /* The kernel resets ipv6 mtu after changing device mtu;
3066          * we must set this here, after we've set device mtu */
3067         r = link_set_ipv6_mtu(link);
3068         if (r < 0)
3069                 return r;
3070
3071         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3072                 r = link_acquire_conf(link);
3073                 if (r < 0)
3074                         return r;
3075         }
3076
3077         return link_enter_join_netdev(link);
3078 }
3079
3080 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3081         assert(duid);
3082
3083         if (duid->raw_data_len > 0)
3084                 return 0;
3085
3086         if (duid->type != DUID_TYPE_UUID)
3087                 return -EINVAL;
3088
3089         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3090         duid->raw_data_len = sizeof(sd_id128_t);
3091
3092         return 1;
3093 }
3094
3095 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3096         Manager *manager = userdata;
3097         const sd_bus_error *e;
3098         const void *a;
3099         size_t sz;
3100         DUID *duid;
3101         Link *link;
3102         int r;
3103
3104         assert(m);
3105         assert(manager);
3106
3107         e = sd_bus_message_get_error(m);
3108         if (e) {
3109                 log_error_errno(sd_bus_error_get_errno(e),
3110                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3111                                 e->message);
3112                 goto configure;
3113         }
3114
3115         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3116         if (r < 0)
3117                 goto configure;
3118
3119         if (sz != sizeof(sd_id128_t)) {
3120                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3121                 goto configure;
3122         }
3123
3124         memcpy(&manager->product_uuid, a, sz);
3125         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3126                 (void) duid_set_uuid(duid, manager->product_uuid);
3127
3128         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3129
3130 configure:
3131         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3132                 link_unref(link);
3133
3134                 r = link_configure(link);
3135                 if (r < 0)
3136                         link_enter_failed(link);
3137         }
3138
3139         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3140
3141         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3142          * even if the method fails. */
3143         manager->has_product_uuid = true;
3144
3145         return 1;
3146 }
3147
3148 static bool link_requires_uuid(Link *link) {
3149         const DUID *duid;
3150
3151         assert(link);
3152         assert(link->manager);
3153         assert(link->network);
3154
3155         duid = link_get_duid(link);
3156         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3157                 return false;
3158
3159         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3160                 return true;
3161
3162         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3163                 return true;
3164
3165         return false;
3166 }
3167
3168 static int link_configure_duid(Link *link) {
3169         Manager *m;
3170         DUID *duid;
3171         int r;
3172
3173         assert(link);
3174         assert(link->manager);
3175         assert(link->network);
3176
3177         m = link->manager;
3178         duid = link_get_duid(link);
3179
3180         if (!link_requires_uuid(link))
3181                 return 1;
3182
3183         if (m->has_product_uuid) {
3184                 (void) duid_set_uuid(duid, m->product_uuid);
3185                 return 1;
3186         }
3187
3188         if (!m->links_requesting_uuid) {
3189                 r = manager_request_product_uuid(m, link);
3190                 if (r < 0) {
3191                         if (r == -ENOMEM)
3192                                 return r;
3193
3194                         log_link_warning_errno(link, r,
3195                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3196                         return 1;
3197                 }
3198         } else {
3199                 r = set_put(m->links_requesting_uuid, link);
3200                 if (r < 0)
3201                         return log_oom();
3202                 if (r > 0)
3203                         link_ref(link);
3204
3205                 r = set_put(m->duids_requesting_uuid, duid);
3206                 if (r < 0)
3207                         return log_oom();
3208         }
3209
3210         return 0;
3211 }
3212
3213 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3214         Network *network;
3215         int r;
3216
3217         if (m) {
3218                 _cleanup_strv_free_ char **s = NULL;
3219
3220                 r = sd_netlink_message_get_errno(m);
3221                 if (r < 0)
3222                         return r;
3223
3224                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3225                 if (r < 0 && r != -ENODATA)
3226                         return r;
3227
3228                 strv_free_and_replace(link->alternative_names, s);
3229         }
3230
3231         r = network_get(link->manager, link->iftype, link->sd_device,
3232                         link->ifname, link->alternative_names, link->driver,
3233                         &link->mac, &link->permanent_mac,
3234                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3235         if (r == -ENOENT) {
3236                 link_enter_unmanaged(link);
3237                 return 0;
3238         } else if (r == 0 && network->unmanaged) {
3239                 link_enter_unmanaged(link);
3240                 return 0;
3241         } else if (r < 0)
3242                 return r;
3243
3244         if (link->network == network && !force)
3245                 return 0;
3246
3247         log_link_info(link, "Re-configuring with %s", network->filename);
3248
3249         /* Dropping old .network file */
3250         r = link_stop_clients(link, false);
3251         if (r < 0)
3252                 return r;
3253
3254         if (link_dhcp4_server_enabled(link))
3255                 (void) sd_dhcp_server_stop(link->dhcp_server);
3256
3257         r = link_drop_config(link);
3258         if (r < 0)
3259                 return r;
3260
3261         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3262                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3263                 r = link_drop_foreign_config(link);
3264                 if (r < 0)
3265                         return r;
3266         }
3267
3268         link_free_carrier_maps(link);
3269         link_free_engines(link);
3270         link->network = network_unref(link->network);
3271
3272         /* Then, apply new .network file */
3273         r = network_apply(network, link);
3274         if (r < 0)
3275                 return r;
3276
3277         r = link_new_carrier_maps(link);
3278         if (r < 0)
3279                 return r;
3280
3281         link_set_state(link, LINK_STATE_INITIALIZED);
3282         link_dirty(link);
3283
3284         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3285          * link_configure() is called later asynchronously. */
3286         r = link_configure_duid(link);
3287         if (r <= 0)
3288                 return r;
3289
3290         r = link_configure(link);
3291         if (r < 0)
3292                 return r;
3293
3294         return 0;
3295 }
3296
3297 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3298         int r;
3299
3300         r = link_reconfigure_internal(link, m, false);
3301         if (r < 0)
3302                 link_enter_failed(link);
3303
3304         return 1;
3305 }
3306
3307 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3308         int r;
3309
3310         r = link_reconfigure_internal(link, m, true);
3311         if (r < 0)
3312                 link_enter_failed(link);
3313
3314         return 1;
3315 }
3316
3317 int link_reconfigure(Link *link, bool force) {
3318         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3319         int r;
3320
3321         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3322                 return 0;
3323
3324         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3325                                      link->ifindex);
3326         if (r < 0)
3327                 return r;
3328
3329         r = netlink_call_async(link->manager->rtnl, NULL, req,
3330                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3331                                link_netlink_destroy_callback, link);
3332         if (r < 0)
3333                 return r;
3334
3335         link_ref(link);
3336
3337         return 0;
3338 }
3339
3340 static int link_initialized_and_synced(Link *link) {
3341         Network *network;
3342         int r;
3343
3344         assert(link);
3345         assert(link->ifname);
3346         assert(link->manager);
3347
3348         /* We may get called either from the asynchronous netlink callback,
3349          * or directly for link_add() if running in a container. See link_add(). */
3350         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3351                 return 0;
3352
3353         log_link_debug(link, "Link state is up-to-date");
3354         link_set_state(link, LINK_STATE_INITIALIZED);
3355
3356         r = link_new_bound_by_list(link);
3357         if (r < 0)
3358                 return r;
3359
3360         r = link_handle_bound_by_list(link);
3361         if (r < 0)
3362                 return r;
3363
3364         if (!link->network) {
3365                 r = wifi_get_info(link);
3366                 if (r < 0)
3367                         return r;
3368
3369                 r = network_get(link->manager, link->iftype, link->sd_device,
3370                                 link->ifname, link->alternative_names, link->driver,
3371                                 &link->mac, &link->permanent_mac,
3372                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3373                 if (r == -ENOENT) {
3374                         link_enter_unmanaged(link);
3375                         return 0;
3376                 } else if (r == 0 && network->unmanaged) {
3377                         link_enter_unmanaged(link);
3378                         return 0;
3379                 } else if (r < 0)
3380                         return r;
3381
3382                 if (link->flags & IFF_LOOPBACK) {
3383                         if (network->link_local != ADDRESS_FAMILY_NO)
3384                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3385
3386                         if (network->dhcp != ADDRESS_FAMILY_NO)
3387                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3388
3389                         if (network->dhcp_server)
3390                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3391                 }
3392
3393                 r = network_apply(network, link);
3394                 if (r < 0)
3395                         return r;
3396         }
3397
3398         r = link_new_bound_to_list(link);
3399         if (r < 0)
3400                 return r;
3401
3402         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3403          * link_configure() is called later asynchronously. */
3404         r = link_configure_duid(link);
3405         if (r <= 0)
3406                 return r;
3407
3408         r = link_configure(link);
3409         if (r < 0)
3410                 return r;
3411
3412         return 0;
3413 }
3414
3415 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3416         _cleanup_strv_free_ char **s = NULL;
3417         int r;
3418
3419         r = sd_netlink_message_get_errno(m);
3420         if (r < 0) {
3421                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3422                 link_enter_failed(link);
3423                 return 0;
3424         }
3425
3426         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3427         if (r < 0 && r != -ENODATA) {
3428                 link_enter_failed(link);
3429                 return 0;
3430         }
3431
3432         strv_free_and_replace(link->alternative_names, s);
3433
3434         r = link_initialized_and_synced(link);
3435         if (r < 0)
3436                 link_enter_failed(link);
3437         return 1;
3438 }
3439
3440 int link_initialized(Link *link, sd_device *device) {
3441         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3442         int r;
3443
3444         assert(link);
3445         assert(link->manager);
3446         assert(link->manager->rtnl);
3447         assert(device);
3448
3449         if (link->state != LINK_STATE_PENDING)
3450                 return 0;
3451
3452         if (link->sd_device)
3453                 return 0;
3454
3455         log_link_debug(link, "udev initialized link");
3456         link_set_state(link, LINK_STATE_INITIALIZED);
3457
3458         link->sd_device = sd_device_ref(device);
3459
3460         /* udev has initialized the link, but we don't know if we have yet
3461          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3462          * when it returns we know that the pending NEWLINKs have already been
3463          * processed and that we are up-to-date */
3464
3465         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3466                                      link->ifindex);
3467         if (r < 0)
3468                 return r;
3469
3470         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3471                                link_netlink_destroy_callback, link);
3472         if (r < 0)
3473                 return r;
3474
3475         link_ref(link);
3476
3477         return 0;
3478 }
3479
3480 static int link_load(Link *link) {
3481         _cleanup_free_ char *network_file = NULL,
3482                             *addresses = NULL,
3483                             *routes = NULL,
3484                             *dhcp4_address = NULL,
3485                             *ipv4ll_address = NULL;
3486         union in_addr_union address;
3487         int r;
3488
3489         assert(link);
3490
3491         r = parse_env_file(NULL, link->state_file,
3492                            "NETWORK_FILE", &network_file,
3493                            "ADDRESSES", &addresses,
3494                            "ROUTES", &routes,
3495                            "DHCP4_ADDRESS", &dhcp4_address,
3496                            "IPV4LL_ADDRESS", &ipv4ll_address);
3497         if (r < 0 && r != -ENOENT)
3498                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3499
3500         if (network_file) {
3501                 Network *network;
3502                 char *suffix;
3503
3504                 /* drop suffix */
3505                 suffix = strrchr(network_file, '.');
3506                 if (!suffix) {
3507                         log_link_debug(link, "Failed to get network name from %s", network_file);
3508                         goto network_file_fail;
3509                 }
3510                 *suffix = '\0';
3511
3512                 r = network_get_by_name(link->manager, basename(network_file), &network);
3513                 if (r < 0) {
3514                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3515                         goto network_file_fail;
3516                 }
3517
3518                 r = network_apply(network, link);
3519                 if (r < 0)
3520                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3521         }
3522
3523 network_file_fail:
3524
3525         for (const char *p = addresses; p; ) {
3526                 _cleanup_free_ char *address_str = NULL;
3527                 char *prefixlen_str;
3528                 int family;
3529                 unsigned char prefixlen;
3530
3531                 r = extract_first_word(&p, &address_str, NULL, 0);
3532                 if (r < 0)
3533                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3534                 if (r <= 0)
3535                         break;
3536
3537                 prefixlen_str = strchr(address_str, '/');
3538                 if (!prefixlen_str) {
3539                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3540                         continue;
3541                 }
3542                 *prefixlen_str++ = '\0';
3543
3544                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3545                 if (r != 1) {
3546                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3547                         continue;
3548                 }
3549
3550                 r = in_addr_from_string_auto(address_str, &family, &address);
3551                 if (r < 0) {
3552                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3553                         continue;
3554                 }
3555
3556                 r = address_add(link, family, &address, prefixlen, NULL);
3557                 if (r < 0)
3558                         return log_link_error_errno(link, r, "Failed to add address: %m");
3559         }
3560
3561         for (const char *p = routes; p; ) {
3562                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3563                 _cleanup_(route_freep) Route *tmp = NULL;
3564                 _cleanup_free_ char *route_str = NULL;
3565                 char *prefixlen_str;
3566                 Route *route;
3567
3568                 r = extract_first_word(&p, &route_str, NULL, 0);
3569                 if (r < 0)
3570                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3571                 if (r <= 0)
3572                         break;
3573
3574                 prefixlen_str = strchr(route_str, '/');
3575                 if (!prefixlen_str) {
3576                         log_link_debug(link, "Failed to parse route %s", route_str);
3577                         continue;
3578                 }
3579                 *prefixlen_str++ = '\0';
3580
3581                 r = route_new(&tmp);
3582                 if (r < 0)
3583                         return log_oom();
3584
3585                 r = sscanf(prefixlen_str,
3586                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3587                            &tmp->dst_prefixlen,
3588                            &tmp->tos,
3589                            &tmp->priority,
3590                            &tmp->table,
3591                            &tmp->lifetime);
3592                 if (r != 5) {
3593                         log_link_debug(link,
3594                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3595                                        prefixlen_str);
3596                         continue;
3597                 }
3598
3599                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3600                 if (r < 0) {
3601                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3602                         continue;
3603                 }
3604
3605                 r = route_add(link, tmp, &route);
3606                 if (r < 0)
3607                         return log_link_error_errno(link, r, "Failed to add route: %m");
3608
3609                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3610                         r = sd_event_add_time(link->manager->event, &expire,
3611                                               clock_boottime_or_monotonic(),
3612                                               route->lifetime, 0, route_expire_handler, route);
3613                         if (r < 0)
3614                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3615                 }
3616
3617                 sd_event_source_unref(route->expire);
3618                 route->expire = TAKE_PTR(expire);
3619         }
3620
3621         if (dhcp4_address) {
3622                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3623                 if (r < 0) {
3624                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3625                         goto dhcp4_address_fail;
3626                 }
3627
3628                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3629                 if (r < 0)
3630                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3631
3632                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3633                 if (r < 0)
3634                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3635
3636                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3637                 if (r < 0)
3638                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3639         }
3640
3641 dhcp4_address_fail:
3642
3643         if (ipv4ll_address) {
3644                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3645                 if (r < 0) {
3646                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3647                         goto ipv4ll_address_fail;
3648                 }
3649
3650                 r = sd_ipv4ll_new(&link->ipv4ll);
3651                 if (r < 0)
3652                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3653
3654                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3655                 if (r < 0)
3656                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3657
3658                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3659                 if (r < 0)
3660                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3661         }
3662
3663 ipv4ll_address_fail:
3664
3665         return 0;
3666 }
3667
3668 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3669         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3670         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3671         Link *link;
3672         int r;
3673
3674         assert(m);
3675         assert(m->rtnl);
3676         assert(message);
3677         assert(ret);
3678
3679         r = link_new(m, message, ret);
3680         if (r < 0)
3681                 return r;
3682
3683         link = *ret;
3684
3685         log_link_debug(link, "Link %d added", link->ifindex);
3686
3687         r = link_load(link);
3688         if (r < 0)
3689                 return r;
3690
3691         if (path_is_read_only_fs("/sys") <= 0) {
3692                 /* udev should be around */
3693                 sprintf(ifindex_str, "n%d", link->ifindex);
3694                 r = sd_device_new_from_device_id(&device, ifindex_str);
3695                 if (r < 0) {
3696                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3697                         return 0;
3698                 }
3699
3700                 r = sd_device_get_is_initialized(device);
3701                 if (r < 0) {
3702                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3703                         goto failed;
3704                 }
3705                 if (r == 0) {
3706                         /* not yet ready */
3707                         log_link_debug(link, "link pending udev initialization...");
3708                         return 0;
3709                 }
3710
3711                 r = device_is_renaming(device);
3712                 if (r < 0) {
3713                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3714                         goto failed;
3715                 }
3716                 if (r > 0) {
3717                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3718                         return 0;
3719                 }
3720
3721                 r = link_initialized(link, device);
3722                 if (r < 0)
3723                         goto failed;
3724         } else {
3725                 r = link_initialized_and_synced(link);
3726                 if (r < 0)
3727                         goto failed;
3728         }
3729
3730         return 0;
3731 failed:
3732         link_enter_failed(link);
3733         return r;
3734 }
3735
3736 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3737         int r;
3738
3739         assert(link);
3740
3741         log_link_info(link, "Gained IPv6LL");
3742
3743         link->ipv6ll_address = *address;
3744         link_check_ready(link);
3745
3746         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3747                 r = link_acquire_ipv6_conf(link);
3748                 if (r < 0) {
3749                         link_enter_failed(link);
3750                         return r;
3751                 }
3752         }
3753
3754         return 0;
3755 }
3756
3757 static int link_carrier_gained(Link *link) {
3758         int r;
3759
3760         assert(link);
3761
3762         r = wifi_get_info(link);
3763         if (r < 0)
3764                 return r;
3765         if (r > 0) {
3766                 r = link_reconfigure_internal(link, NULL, false);
3767                 if (r < 0) {
3768                         link_enter_failed(link);
3769                         return r;
3770                 }
3771         }
3772
3773         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3774                 r = link_acquire_conf(link);
3775                 if (r < 0) {
3776                         link_enter_failed(link);
3777                         return r;
3778                 }
3779
3780                 link_set_state(link, LINK_STATE_CONFIGURING);
3781                 r = link_request_set_addresses(link);
3782                 if (r < 0)
3783                         return r;
3784         }
3785
3786         r = link_handle_bound_by_list(link);
3787         if (r < 0)
3788                 return r;
3789
3790         return 0;
3791 }
3792
3793 static int link_carrier_lost(Link *link) {
3794         int r;
3795
3796         assert(link);
3797
3798         if (link->network && link->network->ignore_carrier_loss)
3799                 return 0;
3800
3801         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3802          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3803          * configuration and stop the clients as well. */
3804         if (link->setting_mtu)
3805                 return 0;
3806
3807         r = link_stop_clients(link, false);
3808         if (r < 0) {
3809                 link_enter_failed(link);
3810                 return r;
3811         }
3812
3813         if (link_dhcp4_server_enabled(link))
3814                 (void) sd_dhcp_server_stop(link->dhcp_server);
3815
3816         r = link_drop_config(link);
3817         if (r < 0)
3818                 return r;
3819
3820         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3821                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3822                 r = link_drop_foreign_config(link);
3823                 if (r < 0)
3824                         return r;
3825         }
3826
3827         r = link_handle_bound_by_list(link);
3828         if (r < 0)
3829                 return r;
3830
3831         return 0;
3832 }
3833
3834 int link_carrier_reset(Link *link) {
3835         int r;
3836
3837         assert(link);
3838
3839         if (link_has_carrier(link)) {
3840                 r = link_carrier_lost(link);
3841                 if (r < 0)
3842                         return r;
3843
3844                 r = link_carrier_gained(link);
3845                 if (r < 0)
3846                         return r;
3847
3848                 log_link_info(link, "Reset carrier");
3849         }
3850
3851         return 0;
3852 }
3853
3854 /* This is called every time an interface admin state changes to up;
3855  * specifically, when IFF_UP flag changes from unset to set */
3856 static int link_admin_state_up(Link *link) {
3857         int r;
3858
3859         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3860          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3861          * ipv6_mtu_set prevents this from trying to set it too early before
3862          * the link->network has been setup; we only need to reset it
3863          * here if we've already set it during normal initialization. */
3864         if (link->ipv6_mtu_set) {
3865                 r = link_set_ipv6_mtu(link);
3866                 if (r < 0)
3867                         return r;
3868         }
3869
3870         return 0;
3871 }
3872
3873 int link_update(Link *link, sd_netlink_message *m) {
3874         _cleanup_strv_free_ char **s = NULL;
3875         struct ether_addr mac;
3876         const char *ifname;
3877         uint32_t mtu;
3878         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3879         int old_master, r;
3880
3881         assert(link);
3882         assert(link->ifname);
3883         assert(m);
3884
3885         if (link->state == LINK_STATE_LINGER) {
3886                 log_link_info(link, "Link re-added");
3887                 link_set_state(link, LINK_STATE_CONFIGURING);
3888
3889                 r = link_new_carrier_maps(link);
3890                 if (r < 0)
3891                         return r;
3892         }
3893
3894         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3895         if (r >= 0 && !streq(ifname, link->ifname)) {
3896                 Manager *manager = link->manager;
3897
3898                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3899
3900                 link_drop(link);
3901                 r = link_add(manager, m, &link);
3902                 if (r < 0)
3903                         return r;
3904         }
3905
3906         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3907         if (r >= 0)
3908                 strv_free_and_replace(link->alternative_names, s);
3909
3910         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3911         if (r >= 0 && mtu > 0) {
3912                 link->mtu = mtu;
3913                 if (link->original_mtu == 0) {
3914                         link->original_mtu = mtu;
3915                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3916                 }
3917
3918                 if (link->dhcp_client) {
3919                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3920                                                    link->mtu);
3921                         if (r < 0)
3922                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3923                 }
3924
3925                 if (link->radv) {
3926                         r = sd_radv_set_mtu(link->radv, link->mtu);
3927                         if (r < 0)
3928                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3929                 }
3930         }
3931
3932         /* The kernel may broadcast NEWLINK messages without the MAC address
3933            set, simply ignore them. */
3934         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3935         if (r >= 0) {
3936                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3937                            ETH_ALEN)) {
3938
3939                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3940                                ETH_ALEN);
3941
3942                         log_link_debug(link, "MAC address: "
3943                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3944                                        mac.ether_addr_octet[0],
3945                                        mac.ether_addr_octet[1],
3946                                        mac.ether_addr_octet[2],
3947                                        mac.ether_addr_octet[3],
3948                                        mac.ether_addr_octet[4],
3949                                        mac.ether_addr_octet[5]);
3950
3951                         if (link->ipv4ll) {
3952                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3953                                 if (r < 0)
3954                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3955                         }
3956
3957                         if (link->dhcp_client) {
3958                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3959                                                            (const uint8_t *) &link->mac,
3960                                                            sizeof (link->mac),
3961                                                            ARPHRD_ETHER);
3962                                 if (r < 0)
3963                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3964
3965                                 r = dhcp4_set_client_identifier(link);
3966                                 if (r < 0)
3967                                         return r;
3968                         }
3969
3970                         if (link->dhcp6_client) {
3971                                 const DUID* duid = link_get_duid(link);
3972
3973                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3974                                                             (const uint8_t *) &link->mac,
3975                                                             sizeof (link->mac),
3976                                                             ARPHRD_ETHER);
3977                                 if (r < 0)
3978                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3979
3980                                 if (link->network->iaid_set) {
3981                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3982                                                                      link->network->iaid);
3983                                         if (r < 0)
3984                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3985                                 }
3986
3987                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3988                                                              duid->type,
3989                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3990                                                              duid->raw_data_len);
3991                                 if (r < 0)
3992                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3993                         }
3994
3995                         if (link->radv) {
3996                                 r = sd_radv_set_mac(link->radv, &link->mac);
3997                                 if (r < 0)
3998                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3999                         }
4000
4001                         if (link->ndisc) {
4002                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4003                                 if (r < 0)
4004                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
4005                         }
4006                 }
4007         }
4008
4009         old_master = link->master_ifindex;
4010         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4011
4012         link_was_admin_up = link->flags & IFF_UP;
4013         had_carrier = link_has_carrier(link);
4014
4015         r = link_update_flags(link, m, old_master != link->master_ifindex);
4016         if (r < 0)
4017                 return r;
4018
4019         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4020                 log_link_info(link, "Link UP");
4021
4022                 r = link_admin_state_up(link);
4023                 if (r < 0)
4024                         return r;
4025         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4026                 log_link_info(link, "Link DOWN");
4027
4028         r = link_update_lldp(link);
4029         if (r < 0)
4030                 return r;
4031
4032         carrier_gained = !had_carrier && link_has_carrier(link);
4033         carrier_lost = had_carrier && !link_has_carrier(link);
4034
4035         if (carrier_gained) {
4036                 log_link_info(link, "Gained carrier");
4037
4038                 r = link_carrier_gained(link);
4039                 if (r < 0)
4040                         return r;
4041         } else if (carrier_lost) {
4042                 log_link_info(link, "Lost carrier");
4043
4044                 r = link_carrier_lost(link);
4045                 if (r < 0)
4046                         return r;
4047         }
4048
4049         return 0;
4050 }
4051
4052 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4053         bool space = false;
4054         Iterator i;
4055         Link *link;
4056
4057         assert(f);
4058         assert(prefix);
4059
4060         if (hashmap_isempty(h))
4061                 return;
4062
4063         fputs(prefix, f);
4064         HASHMAP_FOREACH(link, h, i) {
4065                 if (space)
4066                         fputc(' ', f);
4067
4068                 fprintf(f, "%i", link->ifindex);
4069                 space = true;
4070         }
4071
4072         fputc('\n', f);
4073 }
4074
4075 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
4076         for (unsigned j = 0; j < n_dns; j++) {
4077                 _cleanup_free_ char *b = NULL;
4078                 int r;
4079
4080                 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
4081                 if (r < 0) {
4082                         log_debug_errno(r, "Failed to format address, ignoring: %m");
4083                         continue;
4084                 }
4085
4086                 if (*space)
4087                         fputc(' ', f);
4088                 fputs(b, f);
4089                 *space = true;
4090         }
4091 }
4092
4093 static void serialize_addresses(
4094                 FILE *f,
4095                 const char *lvalue,
4096                 bool *space,
4097                 char **addresses,
4098                 sd_dhcp_lease *lease,
4099                 bool conditional,
4100                 sd_dhcp_lease_server_type what,
4101                 sd_dhcp6_lease *lease6,
4102                 bool conditional6,
4103                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4104                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4105         int r;
4106
4107         bool _space = false;
4108         if (!space)
4109                 space = &_space;
4110
4111         if (lvalue)
4112                 fprintf(f, "%s=", lvalue);
4113         fputstrv(f, addresses, NULL, space);
4114
4115         if (lease && conditional) {
4116                 const struct in_addr *lease_addresses;
4117
4118                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4119                 if (r > 0)
4120                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4121         }
4122
4123         if (lease6 && conditional6 && lease6_get_addr) {
4124                 const struct in6_addr *in6_addrs;
4125
4126                 r = lease6_get_addr(lease6, &in6_addrs);
4127                 if (r > 0)
4128                         serialize_in6_addrs(f, in6_addrs, r, space);
4129         }
4130
4131         if (lease6 && conditional6 && lease6_get_fqdn) {
4132                 char **in6_hosts;
4133
4134                 r = lease6_get_fqdn(lease6, &in6_hosts);
4135                 if (r > 0)
4136                         fputstrv(f, in6_hosts, NULL, space);
4137         }
4138
4139         if (lvalue)
4140                 fputc('\n', f);
4141 }
4142
4143 int link_save(Link *link) {
4144         const char *admin_state, *oper_state, *carrier_state, *address_state;
4145         _cleanup_free_ char *temp_path = NULL;
4146         _cleanup_fclose_ FILE *f = NULL;
4147         Route *route;
4148         Address *a;
4149         Iterator i;
4150         int r;
4151
4152         assert(link);
4153         assert(link->state_file);
4154         assert(link->lease_file);
4155         assert(link->manager);
4156
4157         if (link->state == LINK_STATE_LINGER) {
4158                 (void) unlink(link->state_file);
4159                 return 0;
4160         }
4161
4162         link_lldp_save(link);
4163
4164         admin_state = link_state_to_string(link->state);
4165         assert(admin_state);
4166
4167         oper_state = link_operstate_to_string(link->operstate);
4168         assert(oper_state);
4169
4170         carrier_state = link_carrier_state_to_string(link->carrier_state);
4171         assert(carrier_state);
4172
4173         address_state = link_address_state_to_string(link->address_state);
4174         assert(address_state);
4175
4176         r = fopen_temporary(link->state_file, &f, &temp_path);
4177         if (r < 0)
4178                 goto fail;
4179
4180         (void) fchmod(fileno(f), 0644);
4181
4182         fprintf(f,
4183                 "# This is private data. Do not parse.\n"
4184                 "ADMIN_STATE=%s\n"
4185                 "OPER_STATE=%s\n"
4186                 "CARRIER_STATE=%s\n"
4187                 "ADDRESS_STATE=%s\n",
4188                 admin_state, oper_state, carrier_state, address_state);
4189
4190         if (link->network) {
4191                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4192                 const char *dhcp_domainname = NULL, *p;
4193                 sd_dhcp6_lease *dhcp6_lease = NULL;
4194                 bool space;
4195
4196                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4197                         yes_no(link->network->required_for_online));
4198
4199                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4200                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4201                         strempty(link_operstate_to_string(st.min)),
4202                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4203                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4204
4205                 if (link->dhcp6_client) {
4206                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4207                         if (r < 0 && r != -ENOMSG)
4208                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4209                 }
4210
4211                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4212
4213                 /************************************************************/
4214
4215                 fputs("DNS=", f);
4216                 space = false;
4217                 if (link->n_dns != (unsigned) -1)
4218                         link_save_dns(f, link->dns, link->n_dns, &space);
4219                 else
4220                         link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4221
4222                 serialize_addresses(f, NULL, &space,
4223                                     NULL,
4224                                     link->dhcp_lease,
4225                                     link->network->dhcp_use_dns,
4226                                     SD_DHCP_LEASE_DNS,
4227                                     dhcp6_lease,
4228                                     link->network->dhcp6_use_dns,
4229                                     sd_dhcp6_lease_get_dns,
4230                                     NULL);
4231
4232                 /* Make sure to flush out old entries before we use the NDISC data */
4233                 ndisc_vacuum(link);
4234
4235                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4236                         NDiscRDNSS *dd;
4237
4238                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4239                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4240                 }
4241
4242                 fputc('\n', f);
4243
4244                 /************************************************************/
4245
4246                 serialize_addresses(f, "NTP", NULL,
4247                                     link->ntp ?: link->network->ntp,
4248                                     link->dhcp_lease,
4249                                     link->network->dhcp_use_ntp,
4250                                     SD_DHCP_LEASE_NTP,
4251                                     dhcp6_lease,
4252                                     link->network->dhcp6_use_ntp,
4253                                     sd_dhcp6_lease_get_ntp_addrs,
4254                                     sd_dhcp6_lease_get_ntp_fqdn);
4255
4256                 serialize_addresses(f, "SIP", NULL,
4257                                     NULL,
4258                                     link->dhcp_lease,
4259                                     link->network->dhcp_use_sip,
4260                                     SD_DHCP_LEASE_SIP,
4261                                     NULL, false, NULL, NULL);
4262
4263                 /************************************************************/
4264
4265                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4266                         if (link->dhcp_lease) {
4267                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4268                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4269                         }
4270                         if (dhcp6_lease)
4271                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4272                 }
4273
4274                 fputs("DOMAINS=", f);
4275                 space = false;
4276                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4277                         fputs_with_space(f, p, NULL, &space);
4278
4279                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4280                         if (dhcp_domainname)
4281                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4282                         if (dhcp_domains)
4283                                 fputstrv(f, dhcp_domains, NULL, &space);
4284                         if (dhcp6_domains)
4285                                 fputstrv(f, dhcp6_domains, NULL, &space);
4286                 }
4287
4288                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4289                         NDiscDNSSL *dd;
4290
4291                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4292                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4293                 }
4294
4295                 fputc('\n', f);
4296
4297                 /************************************************************/
4298
4299                 fputs("ROUTE_DOMAINS=", f);
4300                 space = false;
4301                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4302                         fputs_with_space(f, p, NULL, &space);
4303
4304                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4305                         if (dhcp_domainname)
4306                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4307                         if (dhcp_domains)
4308                                 fputstrv(f, dhcp_domains, NULL, &space);
4309                         if (dhcp6_domains)
4310                                 fputstrv(f, dhcp6_domains, NULL, &space);
4311                 }
4312
4313                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4314                         NDiscDNSSL *dd;
4315
4316                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4317                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4318                 }
4319
4320                 fputc('\n', f);
4321
4322                 /************************************************************/
4323
4324                 fprintf(f, "LLMNR=%s\n",
4325                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4326
4327                 /************************************************************/
4328
4329                 fprintf(f, "MDNS=%s\n",
4330                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4331
4332                 /************************************************************/
4333
4334                 int dns_default_route =
4335                         link->dns_default_route >= 0 ? link->dns_default_route :
4336                         link->network->dns_default_route;
4337                 if (dns_default_route >= 0)
4338                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4339
4340                 /************************************************************/
4341
4342                 DnsOverTlsMode dns_over_tls_mode =
4343                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4344                         link->network->dns_over_tls_mode;
4345                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4346                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4347
4348                 /************************************************************/
4349
4350                 DnssecMode dnssec_mode =
4351                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4352                         link->network->dnssec_mode;
4353                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4354                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4355
4356                 /************************************************************/
4357
4358                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4359                 if (set_isempty(nta_anchors))
4360                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4361
4362                 if (!set_isempty(nta_anchors)) {
4363                         const char *n;
4364
4365                         fputs("DNSSEC_NTA=", f);
4366                         space = false;
4367                         SET_FOREACH(n, nta_anchors, i)
4368                                 fputs_with_space(f, n, NULL, &space);
4369                         fputc('\n', f);
4370                 }
4371
4372                 /************************************************************/
4373
4374                 fputs("ADDRESSES=", f);
4375                 space = false;
4376                 SET_FOREACH(a, link->addresses, i) {
4377                         _cleanup_free_ char *address_str = NULL;
4378
4379                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4380                         if (r < 0)
4381                                 goto fail;
4382
4383                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4384                         space = true;
4385                 }
4386                 fputc('\n', f);
4387
4388                 /************************************************************/
4389
4390                 fputs("ROUTES=", f);
4391                 space = false;
4392                 SET_FOREACH(route, link->routes, i) {
4393                         _cleanup_free_ char *route_str = NULL;
4394
4395                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4396                         if (r < 0)
4397                                 goto fail;
4398
4399                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4400                                 space ? " " : "", route_str,
4401                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4402                         space = true;
4403                 }
4404
4405                 fputc('\n', f);
4406         }
4407
4408         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4409         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4410
4411         if (link->dhcp_lease) {
4412                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4413                 if (r < 0)
4414                         goto fail;
4415
4416                 fprintf(f,
4417                         "DHCP_LEASE=%s\n",
4418                         link->lease_file);
4419         } else
4420                 (void) unlink(link->lease_file);
4421
4422         if (link->ipv4ll) {
4423                 struct in_addr address;
4424
4425                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4426                 if (r >= 0) {
4427                         fputs("IPV4LL_ADDRESS=", f);
4428                         serialize_in_addrs(f, &address, 1, false, NULL);
4429                         fputc('\n', f);
4430                 }
4431         }
4432
4433         if (link->dhcp6_client) {
4434                 _cleanup_free_ char *duid = NULL;
4435                 uint32_t iaid;
4436
4437                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4438                 if (r >= 0)
4439                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4440
4441                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4442                 if (r >= 0)
4443                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4444         }
4445
4446         r = fflush_and_check(f);
4447         if (r < 0)
4448                 goto fail;
4449
4450         if (rename(temp_path, link->state_file) < 0) {
4451                 r = -errno;
4452                 goto fail;
4453         }
4454
4455         return 0;
4456
4457 fail:
4458         (void) unlink(link->state_file);
4459         if (temp_path)
4460                 (void) unlink(temp_path);
4461
4462         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4463 }
4464
4465 /* The serialized state in /run is no longer up-to-date. */
4466 void link_dirty(Link *link) {
4467         int r;
4468
4469         assert(link);
4470
4471         /* mark manager dirty as link is dirty */
4472         manager_dirty(link->manager);
4473
4474         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4475         if (r <= 0)
4476                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4477                 return;
4478         link_ref(link);
4479 }
4480
4481 /* The serialized state in /run is up-to-date */
4482 void link_clean(Link *link) {
4483         assert(link);
4484         assert(link->manager);
4485
4486         link_unref(set_remove(link->manager->dirty_links, link));
4487 }
4488
4489 static const char* const link_state_table[_LINK_STATE_MAX] = {
4490         [LINK_STATE_PENDING] = "pending",
4491         [LINK_STATE_INITIALIZED] = "initialized",
4492         [LINK_STATE_CONFIGURING] = "configuring",
4493         [LINK_STATE_CONFIGURED] = "configured",
4494         [LINK_STATE_UNMANAGED] = "unmanaged",
4495         [LINK_STATE_FAILED] = "failed",
4496         [LINK_STATE_LINGER] = "linger",
4497 };
4498
4499 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4500
4501 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4502         const char *err_msg = NULL;
4503
4504         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4505         return log_link_full(link, level, err,
4506                              "%s: %s%s%s%m",
4507                              msg,
4508                              strempty(err_msg),
4509                              err_msg && !endswith(err_msg, ".") ? "." : "",
4510                              err_msg ? " " : "");
4511 }