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         if (link->n_dns != (unsigned) -1)
 670                 for (unsigned i = 0; i < link->n_dns; i++)
 671                         in_addr_full_free(link->dns[i]);
 672         link->dns = mfree(link->dns);
 673         link->n_dns = (unsigned) -1;
 674
 675         link->search_domains = ordered_set_free_free(link->search_domains);
 676         link->route_domains = ordered_set_free_free(link->route_domains);
 677
 678         link->dns_default_route = -1;
 679         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 680         link->mdns = _RESOLVE_SUPPORT_INVALID;
 681         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 682         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 683
 684         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 685 }
 686
 687 static void link_free_engines(Link *link) {
 688         if (!link)
 689                 return;
 690
 691         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 692         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 693         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 694         link->dhcp_routes = set_free(link->dhcp_routes);
 695
 696         link->lldp = sd_lldp_unref(link->lldp);
 697
 698         ndisc_flush(link);
 699
 700         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 701         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 702         link->ndisc = sd_ndisc_unref(link->ndisc);
 703         link->radv = sd_radv_unref(link->radv);
 704 }
 705
 706 static Link *link_free(Link *link) {
 707         Address *address;
 708
 709         assert(link);
 710
 711         link_ntp_settings_clear(link);
 712         link_dns_settings_clear(link);
 713
 714         link->routes = set_free_with_destructor(link->routes, route_free);
 715         link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
 716
 717         link->nexthops = set_free_with_destructor(link->nexthops, nexthop_free);
 718         link->nexthops_foreign = set_free_with_destructor(link->nexthops_foreign, nexthop_free);
 719
 720         link->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
 721         link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
 722
 723         link->addresses = set_free_with_destructor(link->addresses, address_free);
 724         link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
 725
 726         while ((address = link->pool_addresses)) {
 727                 LIST_REMOVE(addresses, link->pool_addresses, address);
 728                 address_free(address);
 729         }
 730
 731         link_lldp_emit_stop(link);
 732         link_free_engines(link);
 733         free(link->lease_file);
 734         free(link->lldp_file);
 735
 736         free(link->ifname);
 737         strv_free(link->alternative_names);
 738         free(link->kind);
 739         free(link->ssid);
 740         free(link->driver);
 741
 742         (void) unlink(link->state_file);
 743         free(link->state_file);
 744
 745         sd_device_unref(link->sd_device);
 746
 747         hashmap_free(link->bound_to_links);
 748         hashmap_free(link->bound_by_links);
 749
 750         set_free_with_destructor(link->slaves, link_unref);
 751
 752         network_unref(link->network);
 753
 754         return mfree(link);
 755 }
 756
 757 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 758
 759 int link_get(Manager *m, int ifindex, Link **ret) {
 760         Link *link;
 761
 762         assert(m);
 763         assert(ifindex > 0);
 764         assert(ret);
 765
 766         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 767         if (!link)
 768                 return -ENODEV;
 769
 770         *ret = link;
 771
 772         return 0;
 773 }
 774
 775 void link_set_state(Link *link, LinkState state) {
 776         assert(link);
 777
 778         if (link->state == state)
 779                 return;
 780
 781         log_link_debug(link, "State changed: %s -> %s",
 782                        link_state_to_string(link->state),
 783                        link_state_to_string(state));
 784
 785         link->state = state;
 786
 787         link_send_changed(link, "AdministrativeState", NULL);
 788 }
 789
 790 static void link_enter_unmanaged(Link *link) {
 791         assert(link);
 792
 793         link_set_state(link, LINK_STATE_UNMANAGED);
 794
 795         link_dirty(link);
 796 }
 797
 798 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 799         int r = 0, k;
 800         Address *ad;
 801
 802         assert(link);
 803         assert(link->manager);
 804         assert(link->manager->event);
 805
 806         bool keep_dhcp = may_keep_dhcp &&
 807                          link->network &&
 808                          (link->manager->restarting ||
 809                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 810
 811         if (link->dhcp_client && !keep_dhcp) {
 812                 k = sd_dhcp_client_stop(link->dhcp_client);
 813                 if (k < 0)
 814                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 815         }
 816
 817         if (link->ipv4ll) {
 818                 k = sd_ipv4ll_stop(link->ipv4ll);
 819                 if (k < 0)
 820                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 821         }
 822
 823         if (link->network)
 824                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 825                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 826                                 k = sd_ipv4acd_stop(ad->acd);
 827                                 if (k < 0)
 828                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 829                         }
 830
 831         if (link->dhcp6_client) {
 832                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 833                 if (k < 0)
 834                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 835         }
 836
 837         if (link->ndisc) {
 838                 k = sd_ndisc_stop(link->ndisc);
 839                 if (k < 0)
 840                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 841         }
 842
 843         if (link->radv) {
 844                 k = sd_radv_stop(link->radv);
 845                 if (k < 0)
 846                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 847         }
 848
 849         link_lldp_emit_stop(link);
 850         return r;
 851 }
 852
 853 void link_enter_failed(Link *link) {
 854         assert(link);
 855
 856         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 857                 return;
 858
 859         log_link_warning(link, "Failed");
 860
 861         link_set_state(link, LINK_STATE_FAILED);
 862
 863         link_stop_clients(link, false);
 864
 865         link_dirty(link);
 866 }
 867
 868 static int link_join_netdevs_after_configured(Link *link) {
 869         NetDev *netdev;
 870         Iterator i;
 871         int r;
 872
 873         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 874                 if (netdev->ifindex > 0)
 875                         /* Assume already enslaved. */
 876                         continue;
 877
 878                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 879                         continue;
 880
 881                 log_struct(LOG_DEBUG,
 882                            LOG_LINK_INTERFACE(link),
 883                            LOG_NETDEV_INTERFACE(netdev),
 884                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 885
 886                 r = netdev_join(netdev, link, NULL);
 887                 if (r < 0)
 888                         return log_struct_errno(LOG_WARNING, r,
 889                                                 LOG_LINK_INTERFACE(link),
 890                                                 LOG_NETDEV_INTERFACE(netdev),
 891                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 892         }
 893
 894         return 0;
 895 }
 896
 897 static void link_enter_configured(Link *link) {
 898         assert(link);
 899         assert(link->network);
 900
 901         if (link->state != LINK_STATE_CONFIGURING)
 902                 return;
 903
 904         link_set_state(link, LINK_STATE_CONFIGURED);
 905
 906         (void) link_join_netdevs_after_configured(link);
 907
 908         link_dirty(link);
 909 }
 910
 911 static int link_request_set_routing_policy_rule(Link *link) {
 912         RoutingPolicyRule *rule, *rrule = NULL;
 913         int r;
 914
 915         assert(link);
 916         assert(link->network);
 917
 918         link->routing_policy_rules_configured = false;
 919
 920         LIST_FOREACH(rules, rule, link->network->rules) {
 921                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 922                 if (r >= 0) {
 923                         if (r == 0)
 924                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 925                         continue;
 926                 }
 927
 928                 r = routing_policy_rule_configure(rule, link, NULL);
 929                 if (r < 0)
 930                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 931                 if (r > 0)
 932                         link->routing_policy_rule_messages++;
 933         }
 934
 935         routing_policy_rule_purge(link->manager, link);
 936         if (link->routing_policy_rule_messages == 0)
 937                 link->routing_policy_rules_configured = true;
 938         else {
 939                 log_link_debug(link, "Setting routing policy rules");
 940                 link_set_state(link, LINK_STATE_CONFIGURING);
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 947         int r;
 948
 949         assert(link);
 950         assert(link->nexthop_messages > 0);
 951         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 952                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 953
 954         link->nexthop_messages--;
 955
 956         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 957                 return 1;
 958
 959         r = sd_netlink_message_get_errno(m);
 960         if (r < 0 && r != -EEXIST) {
 961                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 962                 link_enter_failed(link);
 963                 return 1;
 964         }
 965
 966         if (link->nexthop_messages == 0) {
 967                 log_link_debug(link, "Nexthop set");
 968                 link->static_nexthops_configured = true;
 969                 link_check_ready(link);
 970         }
 971
 972         return 1;
 973 }
 974
 975 static int link_request_set_nexthop(Link *link) {
 976         NextHop *nh;
 977         int r;
 978
 979         link->static_nexthops_configured = false;
 980
 981         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 982                 r = nexthop_configure(nh, link, nexthop_handler);
 983                 if (r < 0)
 984                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 985                 if (r > 0)
 986                         link->nexthop_messages++;
 987         }
 988
 989         if (link->nexthop_messages == 0) {
 990                 link->static_nexthops_configured = true;
 991                 link_check_ready(link);
 992         } else {
 993                 log_link_debug(link, "Setting nexthop");
 994                 link_set_state(link, LINK_STATE_CONFIGURING);
 995         }
 996
 997         return 1;
 998 }
 999
1000 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1001         int r;
1002
1003         assert(link);
1004         assert(link->route_messages > 0);
1005         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1006                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1007
1008         link->route_messages--;
1009
1010         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1011                 return 1;
1012
1013         r = sd_netlink_message_get_errno(m);
1014         if (r < 0 && r != -EEXIST) {
1015                 log_link_message_warning_errno(link, m, r, "Could not set route");
1016                 link_enter_failed(link);
1017                 return 1;
1018         }
1019
1020         if (link->route_messages == 0) {
1021                 log_link_debug(link, "Routes set");
1022                 link->static_routes_configured = true;
1023                 link_request_set_nexthop(link);
1024         }
1025
1026         return 1;
1027 }
1028
1029 int link_request_set_routes(Link *link) {
1030         enum {
1031                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1032                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1033                 _PHASE_MAX
1034         } phase;
1035         Route *rt;
1036         int r;
1037
1038         assert(link);
1039         assert(link->network);
1040         assert(link->addresses_configured);
1041         assert(link->address_messages == 0);
1042         assert(link->state != _LINK_STATE_INVALID);
1043
1044         link->static_routes_configured = false;
1045
1046         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1047                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1048                  * the addresses now, let's not configure the routes either. */
1049                 return 0;
1050
1051         r = link_request_set_routing_policy_rule(link);
1052         if (r < 0)
1053                 return r;
1054
1055         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1056         for (phase = 0; phase < _PHASE_MAX; phase++)
1057                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1058                         if (rt->gateway_from_dhcp)
1059                                 continue;
1060
1061                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1062                                 continue;
1063
1064                         r = route_configure(rt, link, route_handler);
1065                         if (r < 0)
1066                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1067                         if (r > 0)
1068                                 link->route_messages++;
1069                 }
1070
1071         if (link->route_messages == 0) {
1072                 link->static_routes_configured = true;
1073                 link_request_set_nexthop(link);
1074         } else {
1075                 log_link_debug(link, "Setting routes");
1076                 link_set_state(link, LINK_STATE_CONFIGURING);
1077         }
1078
1079         return 0;
1080 }
1081
1082 void link_check_ready(Link *link) {
1083         Address *a;
1084         Iterator i;
1085         int r;
1086
1087         assert(link);
1088
1089         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER)) {
1090                 log_link_debug(link, "%s(): link is in failed or linger state.", __func__);
1091                 return;
1092         }
1093
1094         if (!link->network)
1095                 return;
1096
1097         if (!link->addresses_configured) {
1098                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1099                 return;
1100         }
1101
1102         if (!link->neighbors_configured) {
1103                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1104                 return;
1105         }
1106
1107         SET_FOREACH(a, link->addresses, i)
1108                 if (!address_is_ready(a)) {
1109                         _cleanup_free_ char *str = NULL;
1110
1111                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1112                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1113                         return;
1114                 }
1115
1116         if (!link->addresses_ready) {
1117                 link->addresses_ready = true;
1118                 r = link_request_set_routes(link);
1119                 if (r < 0)
1120                         link_enter_failed(link);
1121                 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1122                 return;
1123         }
1124
1125         if (!link->static_routes_configured) {
1126                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1127                 return;
1128         }
1129
1130         if (!link->static_nexthops_configured) {
1131                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1132                 return;
1133         }
1134
1135         if (!link->routing_policy_rules_configured) {
1136                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1137                 return;
1138         }
1139
1140         if (!link->tc_configured) {
1141                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1142                 return;
1143         }
1144
1145         if (!link->sr_iov_configured) {
1146                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1147                 return;
1148         }
1149
1150         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1151
1152                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address) {
1153                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1154                         return;
1155                 }
1156
1157                 if (link_ipv6ll_enabled(link) &&
1158                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1159                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1160                         return;
1161                 }
1162
1163                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && set_isempty(link->addresses)) {
1164                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no address is assigned yet.", __func__);
1165                         return;
1166                 }
1167
1168                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
1169                         if (!link->dhcp4_configured &&
1170                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1171                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1172                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1173                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address)) {
1174                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1175                                  * an IPv4ll fallback address must be configured. */
1176                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1177                                 return;
1178                         }
1179
1180                         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",
1181                                        __func__,
1182                                        yes_no(link->dhcp4_configured),
1183                                        yes_no(link->dhcp6_address_configured),
1184                                        yes_no(link->dhcp6_route_configured),
1185                                        yes_no(link->dhcp6_pd_address_configured),
1186                                        yes_no(link->dhcp6_pd_route_configured),
1187                                        yes_no(link->ndisc_addresses_configured),
1188                                        yes_no(link->ndisc_routes_configured));
1189                 }
1190         }
1191
1192         if (link->state != LINK_STATE_CONFIGURED)
1193                 link_enter_configured(link);
1194
1195         return;
1196 }
1197
1198 static int link_request_set_neighbors(Link *link) {
1199         Neighbor *neighbor;
1200         int r;
1201
1202         assert(link);
1203         assert(link->network);
1204         assert(link->state != _LINK_STATE_INVALID);
1205
1206         link->neighbors_configured = false;
1207
1208         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1209                 r = neighbor_configure(neighbor, link, NULL);
1210                 if (r < 0)
1211                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1212         }
1213
1214         if (link->neighbor_messages == 0) {
1215                 link->neighbors_configured = true;
1216                 link_check_ready(link);
1217         } else {
1218                 log_link_debug(link, "Setting neighbors");
1219                 link_set_state(link, LINK_STATE_CONFIGURING);
1220         }
1221
1222         return 0;
1223 }
1224
1225 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1226         int r;
1227
1228         assert(rtnl);
1229         assert(m);
1230         assert(link);
1231         assert(link->ifname);
1232         assert(link->address_messages > 0);
1233         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1234                LINK_STATE_FAILED, LINK_STATE_LINGER));
1235
1236         link->address_messages--;
1237
1238         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1239                 return 1;
1240
1241         r = sd_netlink_message_get_errno(m);
1242         if (r < 0 && r != -EEXIST) {
1243                 log_link_message_warning_errno(link, m, r, "Could not set address");
1244                 link_enter_failed(link);
1245                 return 1;
1246         } else if (r >= 0)
1247                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1248
1249         if (link->address_messages == 0) {
1250                 log_link_debug(link, "Addresses set");
1251                 link->addresses_configured = true;
1252                 link_check_ready(link);
1253         }
1254
1255         return 1;
1256 }
1257
1258 static int link_set_bridge_fdb(Link *link) {
1259         FdbEntry *fdb_entry;
1260         int r;
1261
1262         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1263                 r = fdb_entry_configure(link, fdb_entry);
1264                 if (r < 0)
1265                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1266         }
1267
1268         return 0;
1269 }
1270
1271 static int link_request_set_addresses(Link *link) {
1272         AddressLabel *label;
1273         Address *ad;
1274         Prefix *p;
1275         int r;
1276
1277         assert(link);
1278         assert(link->network);
1279         assert(link->state != _LINK_STATE_INVALID);
1280
1281         /* Reset all *_configured flags we are configuring. */
1282         link->addresses_configured = false;
1283         link->addresses_ready = false;
1284         link->neighbors_configured = false;
1285         link->static_routes_configured = false;
1286         link->static_nexthops_configured = false;
1287         link->routing_policy_rules_configured = false;
1288
1289         r = link_set_bridge_fdb(link);
1290         if (r < 0)
1291                 return r;
1292
1293         r = link_request_set_neighbors(link);
1294         if (r < 0)
1295                 return r;
1296
1297         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1298                 bool update;
1299
1300                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1301
1302                 r = address_configure(ad, link, address_handler, update);
1303                 if (r < 0)
1304                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1305                 if (r > 0)
1306                         link->address_messages++;
1307         }
1308
1309         if (IN_SET(link->network->router_prefix_delegation,
1310                    RADV_PREFIX_DELEGATION_STATIC,
1311                    RADV_PREFIX_DELEGATION_BOTH))
1312                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1313                         _cleanup_(address_freep) Address *address = NULL;
1314
1315                         if (!p->assign)
1316                                 continue;
1317
1318                         r = address_new(&address);
1319                         if (r < 0)
1320                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1321
1322                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1323                         if (r < 0)
1324                                 return r;
1325
1326                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1327                         if (r < 0)
1328                                 return r;
1329
1330                         address->family = AF_INET6;
1331                         r = address_configure(address, link, address_handler, true);
1332                         if (r < 0)
1333                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1334                         if (r > 0)
1335                                 link->address_messages++;
1336                 }
1337
1338         LIST_FOREACH(labels, label, link->network->address_labels) {
1339                 r = address_label_configure(label, link, NULL, false);
1340                 if (r < 0)
1341                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1342
1343                 link->address_label_messages++;
1344         }
1345
1346         /* now that we can figure out a default address for the dhcp server,
1347            start it */
1348         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1349                 r = dhcp4_server_configure(link);
1350                 if (r < 0)
1351                         return r;
1352                 log_link_debug(link, "Offering DHCPv4 leases");
1353         }
1354
1355         if (link->address_messages == 0) {
1356                 link->addresses_configured = true;
1357                 link_check_ready(link);
1358         } else {
1359                 log_link_debug(link, "Setting addresses");
1360                 link_set_state(link, LINK_STATE_CONFIGURING);
1361         }
1362
1363         return 0;
1364 }
1365
1366 static int link_set_bridge_vlan(Link *link) {
1367         int r;
1368
1369         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1370         if (r < 0)
1371                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1372
1373         return r;
1374 }
1375
1376 static int link_set_proxy_arp(Link *link) {
1377         int r;
1378
1379         if (!link_proxy_arp_enabled(link))
1380                 return 0;
1381
1382         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1383         if (r < 0)
1384                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1385
1386         return 0;
1387 }
1388
1389 static int link_configure_continue(Link *link);
1390
1391 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1392         int r;
1393
1394         assert(m);
1395         assert(link);
1396         assert(link->ifname);
1397
1398         link->setting_mtu = false;
1399
1400         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1401                 return 1;
1402
1403         r = sd_netlink_message_get_errno(m);
1404         if (r < 0)
1405                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1406         else
1407                 log_link_debug(link, "Setting MTU done.");
1408
1409         if (link->state == LINK_STATE_INITIALIZED) {
1410                 r = link_configure_continue(link);
1411                 if (r < 0)
1412                         link_enter_failed(link);
1413         }
1414
1415         return 1;
1416 }
1417
1418 int link_set_mtu(Link *link, uint32_t mtu) {
1419         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1420         int r;
1421
1422         assert(link);
1423         assert(link->manager);
1424         assert(link->manager->rtnl);
1425
1426         if (mtu == 0 || link->setting_mtu)
1427                 return 0;
1428
1429         if (link->mtu == mtu)
1430                 return 0;
1431
1432         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1433
1434         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1435         if (r < 0)
1436                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1437
1438         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1439          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1440         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1441
1442                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1443                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1444
1445                 mtu = IPV6_MIN_MTU;
1446         }
1447
1448         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1449         if (r < 0)
1450                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1451
1452         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1453                                link_netlink_destroy_callback, link);
1454         if (r < 0)
1455                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1456
1457         link_ref(link);
1458         link->setting_mtu = true;
1459
1460         return 0;
1461 }
1462
1463 static bool link_reduces_vlan_mtu(Link *link) {
1464         /* See netif_reduces_vlan_mtu() in kernel. */
1465         return streq_ptr(link->kind, "macsec");
1466 }
1467
1468 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1469         uint32_t mtu = 0;
1470         NetDev *dev;
1471         Iterator i;
1472
1473         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1474                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1475                         /* See vlan_dev_change_mtu() in kernel. */
1476                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1477
1478                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1479                         /* See macvlan_change_mtu() in kernel. */
1480                         mtu = dev->mtu;
1481
1482         return mtu;
1483 }
1484
1485 static int link_configure_mtu(Link *link) {
1486         uint32_t mtu;
1487
1488         assert(link);
1489         assert(link->network);
1490
1491         if (link->network->mtu > 0)
1492                 return link_set_mtu(link, link->network->mtu);
1493
1494         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1495         if (link->mtu >= mtu)
1496                 return 0;
1497
1498         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1499                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1500                         link->mtu, mtu);
1501
1502         return link_set_mtu(link, mtu);
1503 }
1504
1505 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1506         int r;
1507
1508         assert(m);
1509         assert(link);
1510         assert(link->ifname);
1511
1512         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1513                 return 1;
1514
1515         r = sd_netlink_message_get_errno(m);
1516         if (r < 0)
1517                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1518
1519         return 1;
1520 }
1521
1522 static int link_set_flags(Link *link) {
1523         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1524         unsigned ifi_change = 0;
1525         unsigned ifi_flags = 0;
1526         int r;
1527
1528         assert(link);
1529         assert(link->manager);
1530         assert(link->manager->rtnl);
1531
1532         if (link->flags & IFF_LOOPBACK)
1533                 return 0;
1534
1535         if (!link->network)
1536                 return 0;
1537
1538         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1539                 return 0;
1540
1541         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1542         if (r < 0)
1543                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1544
1545         if (link->network->arp >= 0) {
1546                 ifi_change |= IFF_NOARP;
1547                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1548         }
1549
1550         if (link->network->multicast >= 0) {
1551                 ifi_change |= IFF_MULTICAST;
1552                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1553         }
1554
1555         if (link->network->allmulticast >= 0) {
1556                 ifi_change |= IFF_ALLMULTI;
1557                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1558         }
1559
1560         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1561         if (r < 0)
1562                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1563
1564         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1565                                link_netlink_destroy_callback, link);
1566         if (r < 0)
1567                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1568
1569         link_ref(link);
1570
1571         return 0;
1572 }
1573
1574 static int link_acquire_ipv6_conf(Link *link) {
1575         int r;
1576
1577         assert(link);
1578
1579         if (link_ipv6_accept_ra_enabled(link)) {
1580                 assert(link->ndisc);
1581
1582                 log_link_debug(link, "Discovering IPv6 routers");
1583
1584                 r = sd_ndisc_start(link->ndisc);
1585                 if (r < 0 && r != -EBUSY)
1586                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1587         }
1588
1589         if (link_radv_enabled(link)) {
1590                 assert(link->radv);
1591                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1592
1593                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1594
1595                 r = radv_emit_dns(link);
1596                 if (r < 0)
1597                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1598
1599                 r = sd_radv_start(link->radv);
1600                 if (r < 0 && r != -EBUSY)
1601                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1602         }
1603
1604         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1605                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1606                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1607                 assert(link->dhcp6_client);
1608                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1609
1610                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1611                 if (r < 0 && r != -EBUSY)
1612                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1613                 else
1614                         log_link_debug(link, "Acquiring DHCPv6 lease");
1615         }
1616
1617         (void) dhcp6_request_prefix_delegation(link);
1618
1619         return 0;
1620 }
1621
1622 static int link_acquire_ipv4_conf(Link *link) {
1623         int r;
1624
1625         assert(link);
1626         assert(link->manager);
1627         assert(link->manager->event);
1628
1629         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1630                 assert(link->ipv4ll);
1631
1632                 log_link_debug(link, "Acquiring IPv4 link-local address");
1633
1634                 r = sd_ipv4ll_start(link->ipv4ll);
1635                 if (r < 0)
1636                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1637         }
1638
1639         if (link_dhcp4_enabled(link)) {
1640                 assert(link->dhcp_client);
1641
1642                 log_link_debug(link, "Acquiring DHCPv4 lease");
1643
1644                 r = sd_dhcp_client_start(link->dhcp_client);
1645                 if (r < 0)
1646                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1647         }
1648
1649         return 0;
1650 }
1651
1652 static int link_acquire_conf(Link *link) {
1653         int r;
1654
1655         assert(link);
1656
1657         r = link_acquire_ipv4_conf(link);
1658         if (r < 0)
1659                 return r;
1660
1661         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1662                 r = link_acquire_ipv6_conf(link);
1663                 if (r < 0)
1664                         return r;
1665         }
1666
1667         if (link_lldp_emit_enabled(link)) {
1668                 r = link_lldp_emit_start(link);
1669                 if (r < 0)
1670                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1671         }
1672
1673         return 0;
1674 }
1675
1676 bool link_has_carrier(Link *link) {
1677         /* see Documentation/networking/operstates.txt in the kernel sources */
1678
1679         if (link->kernel_operstate == IF_OPER_UP)
1680                 return true;
1681
1682         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1683                 /* operstate may not be implemented, so fall back to flags */
1684                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1685                     !FLAGS_SET(link->flags, IFF_DORMANT))
1686                         return true;
1687
1688         return false;
1689 }
1690
1691 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1692         int r;
1693
1694         assert(link);
1695
1696         link->setting_genmode = false;
1697
1698         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1699                 return 1;
1700
1701         r = sd_netlink_message_get_errno(m);
1702         if (r < 0)
1703                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1704         else
1705                 log_link_debug(link, "Setting address genmode done.");
1706
1707         if (link->state == LINK_STATE_INITIALIZED) {
1708                 r = link_configure_continue(link);
1709                 if (r < 0)
1710                         link_enter_failed(link);
1711         }
1712
1713         return 1;
1714 }
1715
1716 static int link_configure_addrgen_mode(Link *link) {
1717         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1718         uint8_t ipv6ll_mode;
1719         int r;
1720
1721         assert(link);
1722         assert(link->network);
1723         assert(link->manager);
1724         assert(link->manager->rtnl);
1725
1726         if (!socket_ipv6_is_supported() || link->setting_genmode)
1727                 return 0;
1728
1729         log_link_debug(link, "Setting address genmode for link");
1730
1731         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1732         if (r < 0)
1733                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1734
1735         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1736         if (r < 0)
1737                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1738
1739         r = sd_netlink_message_open_container(req, AF_INET6);
1740         if (r < 0)
1741                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1742
1743         if (!link_ipv6ll_enabled(link))
1744                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1745         else if (link->network->ipv6ll_address_gen_mode < 0) {
1746                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1747                 if (r < 0) {
1748                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1749                          * reading the file fails with EIO. */
1750                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1751
1752                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1753                 } else
1754                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1755         } else
1756                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1757
1758         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1759         if (r < 0)
1760                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1761
1762         r = sd_netlink_message_close_container(req);
1763         if (r < 0)
1764                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1765
1766         r = sd_netlink_message_close_container(req);
1767         if (r < 0)
1768                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1769
1770         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1771                                link_netlink_destroy_callback, link);
1772         if (r < 0)
1773                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1774
1775         link_ref(link);
1776         link->setting_genmode = true;
1777
1778         return 0;
1779 }
1780
1781 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1782         int r;
1783
1784         assert(link);
1785
1786         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1787                 return 1;
1788
1789         r = sd_netlink_message_get_errno(m);
1790         if (r < 0)
1791                 /* we warn but don't fail the link, as it may be brought up later */
1792                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1793
1794         return 1;
1795 }
1796
1797 static int link_up(Link *link) {
1798         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1799         int r;
1800
1801         assert(link);
1802         assert(link->network);
1803         assert(link->manager);
1804         assert(link->manager->rtnl);
1805
1806         log_link_debug(link, "Bringing link up");
1807
1808         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1809         if (r < 0)
1810                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1811
1812         /* set it free if not enslaved with networkd */
1813         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1814                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1815                 if (r < 0)
1816                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1817         }
1818
1819         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1820         if (r < 0)
1821                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1822
1823         if (link->network->mac) {
1824                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1825                 if (r < 0)
1826                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1827         }
1828
1829         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1830                                link_netlink_destroy_callback, link);
1831         if (r < 0)
1832                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1833
1834         link_ref(link);
1835
1836         return 0;
1837 }
1838
1839 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1840         int r;
1841
1842         assert(link);
1843
1844         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1845                 return 1;
1846
1847         r = sd_netlink_message_get_errno(m);
1848         if (r < 0)
1849                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1850
1851         return 1;
1852 }
1853
1854 int link_down(Link *link, link_netlink_message_handler_t callback) {
1855         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1856         int r;
1857
1858         assert(link);
1859         assert(link->manager);
1860         assert(link->manager->rtnl);
1861
1862         log_link_debug(link, "Bringing link down");
1863
1864         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1865                                      RTM_SETLINK, link->ifindex);
1866         if (r < 0)
1867                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1868
1869         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1870         if (r < 0)
1871                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1872
1873         r = netlink_call_async(link->manager->rtnl, NULL, req,
1874                                callback ?: link_down_handler,
1875                                link_netlink_destroy_callback, link);
1876         if (r < 0)
1877                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1878
1879         link_ref(link);
1880
1881         return 0;
1882 }
1883
1884 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1885         int r;
1886
1887         assert(link);
1888
1889         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1890                 return 1;
1891
1892         r = sd_netlink_message_get_errno(m);
1893         if (r < 0)
1894                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1895
1896         return 1;
1897 }
1898
1899 static int link_set_group(Link *link) {
1900         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1901         int r;
1902
1903         assert(link);
1904         assert(link->network);
1905         assert(link->manager);
1906         assert(link->manager->rtnl);
1907
1908         if (link->network->group <= 0)
1909                 return 0;
1910
1911         log_link_debug(link, "Setting group");
1912
1913         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1914         if (r < 0)
1915                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1916
1917         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1918         if (r < 0)
1919                 return log_link_error_errno(link, r, "Could not set link group: %m");
1920
1921         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1922                                link_netlink_destroy_callback, link);
1923         if (r < 0)
1924                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1925
1926         link_ref(link);
1927
1928         return 0;
1929 }
1930
1931 static int link_handle_bound_to_list(Link *link) {
1932         Link *l;
1933         Iterator i;
1934         int r;
1935         bool required_up = false;
1936         bool link_is_up = false;
1937
1938         assert(link);
1939
1940         if (hashmap_isempty(link->bound_to_links))
1941                 return 0;
1942
1943         if (link->flags & IFF_UP)
1944                 link_is_up = true;
1945
1946         HASHMAP_FOREACH (l, link->bound_to_links, i)
1947                 if (link_has_carrier(l)) {
1948                         required_up = true;
1949                         break;
1950                 }
1951
1952         if (!required_up && link_is_up) {
1953                 r = link_down(link, NULL);
1954                 if (r < 0)
1955                         return r;
1956         } else if (required_up && !link_is_up) {
1957                 r = link_up(link);
1958                 if (r < 0)
1959                         return r;
1960         }
1961
1962         return 0;
1963 }
1964
1965 static int link_handle_bound_by_list(Link *link) {
1966         Iterator i;
1967         Link *l;
1968         int r;
1969
1970         assert(link);
1971
1972         if (hashmap_isempty(link->bound_by_links))
1973                 return 0;
1974
1975         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1976                 r = link_handle_bound_to_list(l);
1977                 if (r < 0)
1978                         return r;
1979         }
1980
1981         return 0;
1982 }
1983
1984 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1985         int r;
1986
1987         assert(link);
1988         assert(carrier);
1989
1990         if (link == carrier)
1991                 return 0;
1992
1993         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1994                 return 0;
1995
1996         r = hashmap_ensure_allocated(h, NULL);
1997         if (r < 0)
1998                 return r;
1999
2000         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2001         if (r < 0)
2002                 return r;
2003
2004         return 0;
2005 }
2006
2007 static int link_new_bound_by_list(Link *link) {
2008         Manager *m;
2009         Link *carrier;
2010         Iterator i;
2011         int r;
2012         bool list_updated = false;
2013
2014         assert(link);
2015         assert(link->manager);
2016
2017         m = link->manager;
2018
2019         HASHMAP_FOREACH(carrier, m->links, i) {
2020                 if (!carrier->network)
2021                         continue;
2022
2023                 if (strv_isempty(carrier->network->bind_carrier))
2024                         continue;
2025
2026                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2027                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2028                         if (r < 0)
2029                                 return r;
2030
2031                         list_updated = true;
2032                 }
2033         }
2034
2035         if (list_updated)
2036                 link_dirty(link);
2037
2038         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2039                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2040                 if (r < 0)
2041                         return r;
2042
2043                 link_dirty(carrier);
2044         }
2045
2046         return 0;
2047 }
2048
2049 static int link_new_bound_to_list(Link *link) {
2050         Manager *m;
2051         Link *carrier;
2052         Iterator i;
2053         int r;
2054         bool list_updated = false;
2055
2056         assert(link);
2057         assert(link->manager);
2058
2059         if (!link->network)
2060                 return 0;
2061
2062         if (strv_isempty(link->network->bind_carrier))
2063                 return 0;
2064
2065         m = link->manager;
2066
2067         HASHMAP_FOREACH (carrier, m->links, i) {
2068                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2069                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2070                         if (r < 0)
2071                                 return r;
2072
2073                         list_updated = true;
2074                 }
2075         }
2076
2077         if (list_updated)
2078                 link_dirty(link);
2079
2080         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2081                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2082                 if (r < 0)
2083                         return r;
2084
2085                 link_dirty(carrier);
2086         }
2087
2088         return 0;
2089 }
2090
2091 static int link_new_carrier_maps(Link *link) {
2092         int r;
2093
2094         r = link_new_bound_by_list(link);
2095         if (r < 0)
2096                 return r;
2097
2098         r = link_handle_bound_by_list(link);
2099         if (r < 0)
2100                 return r;
2101
2102         r = link_new_bound_to_list(link);
2103         if (r < 0)
2104                 return r;
2105
2106         r = link_handle_bound_to_list(link);
2107         if (r < 0)
2108                 return r;
2109
2110         return 0;
2111 }
2112
2113 static void link_free_bound_to_list(Link *link) {
2114         Link *bound_to;
2115         Iterator i;
2116
2117         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2118                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2119
2120                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2121                         link_dirty(bound_to);
2122         }
2123
2124         return;
2125 }
2126
2127 static void link_free_bound_by_list(Link *link) {
2128         Link *bound_by;
2129         Iterator i;
2130
2131         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2132                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2133
2134                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2135                         link_dirty(bound_by);
2136                         link_handle_bound_to_list(bound_by);
2137                 }
2138         }
2139
2140         return;
2141 }
2142
2143 static void link_free_carrier_maps(Link *link) {
2144         bool list_updated = false;
2145
2146         assert(link);
2147
2148         if (!hashmap_isempty(link->bound_to_links)) {
2149                 link_free_bound_to_list(link);
2150                 list_updated = true;
2151         }
2152
2153         if (!hashmap_isempty(link->bound_by_links)) {
2154                 link_free_bound_by_list(link);
2155                 list_updated = true;
2156         }
2157
2158         if (list_updated)
2159                 link_dirty(link);
2160
2161         return;
2162 }
2163
2164 static int link_append_to_master(Link *link, NetDev *netdev) {
2165         Link *master;
2166         int r;
2167
2168         assert(link);
2169         assert(netdev);
2170
2171         r = link_get(link->manager, netdev->ifindex, &master);
2172         if (r < 0)
2173                 return r;
2174
2175         r = set_ensure_put(&master->slaves, NULL, link);
2176         if (r <= 0)
2177                 return r;
2178
2179         link_ref(link);
2180         return 0;
2181 }
2182
2183 static void link_drop_from_master(Link *link, NetDev *netdev) {
2184         Link *master;
2185
2186         assert(link);
2187
2188         if (!link->manager || !netdev)
2189                 return;
2190
2191         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2192                 return;
2193
2194         link_unref(set_remove(master->slaves, link));
2195 }
2196
2197 static void link_detach_from_manager(Link *link) {
2198         if (!link || !link->manager)
2199                 return;
2200
2201         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2202         link_clean(link);
2203
2204         /* The following must be called at last. */
2205         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2206         link_unref(link);
2207 }
2208
2209 void link_drop(Link *link) {
2210         if (!link || link->state == LINK_STATE_LINGER)
2211                 return;
2212
2213         link_set_state(link, LINK_STATE_LINGER);
2214
2215         link_free_carrier_maps(link);
2216
2217         if (link->network) {
2218                 link_drop_from_master(link, link->network->bridge);
2219                 link_drop_from_master(link, link->network->bond);
2220         }
2221
2222         log_link_debug(link, "Link removed");
2223
2224         (void) unlink(link->state_file);
2225         link_detach_from_manager(link);
2226 }
2227
2228 static int link_joined(Link *link) {
2229         int r;
2230
2231         assert(link);
2232         assert(link->network);
2233
2234         if (!hashmap_isempty(link->bound_to_links)) {
2235                 r = link_handle_bound_to_list(link);
2236                 if (r < 0)
2237                         return r;
2238         } else if (!(link->flags & IFF_UP)) {
2239                 r = link_up(link);
2240                 if (r < 0) {
2241                         link_enter_failed(link);
2242                         return r;
2243                 }
2244         }
2245
2246         if (link->network->bridge) {
2247                 r = link_set_bridge(link);
2248                 if (r < 0)
2249                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2250
2251                 r = link_append_to_master(link, link->network->bridge);
2252                 if (r < 0)
2253                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2254         }
2255
2256         if (link->network->bond) {
2257                 r = link_set_bond(link);
2258                 if (r < 0)
2259                         log_link_error_errno(link, r, "Could not set bond message: %m");
2260
2261                 r = link_append_to_master(link, link->network->bond);
2262                 if (r < 0)
2263                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2264         }
2265
2266         if (link->network->use_br_vlan &&
2267             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2268                 r = link_set_bridge_vlan(link);
2269                 if (r < 0)
2270                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2271         }
2272
2273         /* Skip setting up addresses until it gets carrier,
2274            or it would try to set addresses twice,
2275            which is bad for non-idempotent steps. */
2276         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2277                 return 0;
2278
2279         link_set_state(link, LINK_STATE_CONFIGURING);
2280         return link_request_set_addresses(link);
2281 }
2282
2283 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2284         int r;
2285
2286         assert(link);
2287         assert(link->network);
2288         assert(link->enslaving > 0);
2289
2290         link->enslaving--;
2291
2292         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2293                 return 1;
2294
2295         r = sd_netlink_message_get_errno(m);
2296         if (r < 0 && r != -EEXIST) {
2297                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2298                 link_enter_failed(link);
2299                 return 1;
2300         }
2301
2302         log_link_debug(link, "Joined netdev");
2303
2304         if (link->enslaving == 0) {
2305                 r = link_joined(link);
2306                 if (r < 0)
2307                         link_enter_failed(link);
2308         }
2309
2310         return 1;
2311 }
2312
2313 static int link_enter_join_netdev(Link *link) {
2314         NetDev *netdev;
2315         Iterator i;
2316         int r;
2317
2318         assert(link);
2319         assert(link->network);
2320         assert(link->state == LINK_STATE_INITIALIZED);
2321
2322         link_set_state(link, LINK_STATE_CONFIGURING);
2323
2324         link_dirty(link);
2325         link->enslaving = 0;
2326
2327         if (link->network->bond) {
2328                 if (link->network->bond->state == NETDEV_STATE_READY &&
2329                     link->network->bond->ifindex == link->master_ifindex)
2330                         return link_joined(link);
2331
2332                 log_struct(LOG_DEBUG,
2333                            LOG_LINK_INTERFACE(link),
2334                            LOG_NETDEV_INTERFACE(link->network->bond),
2335                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2336
2337                 link->enslaving++;
2338
2339                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2340                 if (r < 0) {
2341                         log_struct_errno(LOG_WARNING, r,
2342                                          LOG_LINK_INTERFACE(link),
2343                                          LOG_NETDEV_INTERFACE(link->network->bond),
2344                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2345                         link_enter_failed(link);
2346                         return r;
2347                 }
2348         }
2349
2350         if (link->network->bridge) {
2351                 log_struct(LOG_DEBUG,
2352                            LOG_LINK_INTERFACE(link),
2353                            LOG_NETDEV_INTERFACE(link->network->bridge),
2354                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2355
2356                 link->enslaving++;
2357
2358                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2359                 if (r < 0) {
2360                         log_struct_errno(LOG_WARNING, r,
2361                                          LOG_LINK_INTERFACE(link),
2362                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2363                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2364                         link_enter_failed(link);
2365                         return r;
2366                 }
2367         }
2368
2369         if (link->network->vrf) {
2370                 log_struct(LOG_DEBUG,
2371                            LOG_LINK_INTERFACE(link),
2372                            LOG_NETDEV_INTERFACE(link->network->vrf),
2373                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2374
2375                 link->enslaving++;
2376
2377                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2378                 if (r < 0) {
2379                         log_struct_errno(LOG_WARNING, r,
2380                                          LOG_LINK_INTERFACE(link),
2381                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2382                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2383                         link_enter_failed(link);
2384                         return r;
2385                 }
2386         }
2387
2388         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2389
2390                 if (netdev->ifindex > 0)
2391                         /* Assume already enslaved. */
2392                         continue;
2393
2394                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2395                         continue;
2396
2397                 log_struct(LOG_DEBUG,
2398                            LOG_LINK_INTERFACE(link),
2399                            LOG_NETDEV_INTERFACE(netdev),
2400                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2401
2402                 link->enslaving++;
2403
2404                 r = netdev_join(netdev, link, netdev_join_handler);
2405                 if (r < 0) {
2406                         log_struct_errno(LOG_WARNING, r,
2407                                          LOG_LINK_INTERFACE(link),
2408                                          LOG_NETDEV_INTERFACE(netdev),
2409                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2410                         link_enter_failed(link);
2411                         return r;
2412                 }
2413         }
2414
2415         if (link->enslaving == 0)
2416                 return link_joined(link);
2417
2418         return 0;
2419 }
2420
2421 static int link_set_ipv4_forward(Link *link) {
2422         int r;
2423
2424         if (!link_ipv4_forward_enabled(link))
2425                 return 0;
2426
2427         /* We propagate the forwarding flag from one interface to the
2428          * global setting one way. This means: as long as at least one
2429          * interface was configured at any time that had IP forwarding
2430          * enabled the setting will stay on for good. We do this
2431          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2432          * somewhat in sync (see below). */
2433
2434         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2435         if (r < 0)
2436                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2437
2438         return 0;
2439 }
2440
2441 static int link_set_ipv6_forward(Link *link) {
2442         int r;
2443
2444         if (!link_ipv6_forward_enabled(link))
2445                 return 0;
2446
2447         /* On Linux, the IPv6 stack does not know a per-interface
2448          * packet forwarding setting: either packet forwarding is on
2449          * for all, or off for all. We hence don't bother with a
2450          * per-interface setting, but simply propagate the interface
2451          * flag, if it is set, to the global flag, one-way. Note that
2452          * while IPv4 would allow a per-interface flag, we expose the
2453          * same behaviour there and also propagate the setting from
2454          * one to all, to keep things simple (see above). */
2455
2456         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2457         if (r < 0)
2458                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2459
2460         return 0;
2461 }
2462
2463 static int link_set_ipv6_privacy_extensions(Link *link) {
2464         IPv6PrivacyExtensions s;
2465         int r;
2466
2467         s = link_ipv6_privacy_extensions(link);
2468         if (s < 0)
2469                 return 0;
2470
2471         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2472         if (r < 0)
2473                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2474
2475         return 0;
2476 }
2477
2478 static int link_set_ipv6_accept_ra(Link *link) {
2479         int r;
2480
2481         /* Make this a NOP if IPv6 is not available */
2482         if (!socket_ipv6_is_supported())
2483                 return 0;
2484
2485         if (link->flags & IFF_LOOPBACK)
2486                 return 0;
2487
2488         if (!link->network)
2489                 return 0;
2490
2491         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2492         if (r < 0)
2493                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2494
2495         return 0;
2496 }
2497
2498 static int link_set_ipv6_dad_transmits(Link *link) {
2499         int r;
2500
2501         /* Make this a NOP if IPv6 is not available */
2502         if (!socket_ipv6_is_supported())
2503                 return 0;
2504
2505         if (link->flags & IFF_LOOPBACK)
2506                 return 0;
2507
2508         if (!link->network)
2509                 return 0;
2510
2511         if (link->network->ipv6_dad_transmits < 0)
2512                 return 0;
2513
2514         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2515         if (r < 0)
2516                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2517
2518         return 0;
2519 }
2520
2521 static int link_set_ipv6_hop_limit(Link *link) {
2522         int r;
2523
2524         /* Make this a NOP if IPv6 is not available */
2525         if (!socket_ipv6_is_supported())
2526                 return 0;
2527
2528         if (link->flags & IFF_LOOPBACK)
2529                 return 0;
2530
2531         if (!link->network)
2532                 return 0;
2533
2534         if (link->network->ipv6_hop_limit < 0)
2535                 return 0;
2536
2537         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2538         if (r < 0)
2539                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2540
2541         return 0;
2542 }
2543
2544 static int link_set_ipv6_mtu(Link *link) {
2545         int r;
2546
2547         /* Make this a NOP if IPv6 is not available */
2548         if (!socket_ipv6_is_supported())
2549                 return 0;
2550
2551         if (link->flags & IFF_LOOPBACK)
2552                 return 0;
2553
2554         if (link->network->ipv6_mtu == 0)
2555                 return 0;
2556
2557         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2558          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2559         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2560                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2561                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2562         }
2563
2564         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2565         if (r < 0) {
2566                 if (link->mtu < link->network->ipv6_mtu)
2567                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2568                                          link->network->ipv6_mtu, link->mtu);
2569                 else
2570                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2571         }
2572
2573         link->ipv6_mtu_set = true;
2574
2575         return 0;
2576 }
2577
2578 static int link_set_ipv4_accept_local(Link *link) {
2579         int r;
2580
2581         if (link->flags & IFF_LOOPBACK)
2582                 return 0;
2583
2584         if (link->network->ipv4_accept_local < 0)
2585                 return 0;
2586
2587         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2588         if (r < 0)
2589                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2590
2591         return 0;
2592 }
2593
2594 static bool link_is_static_address_configured(Link *link, Address *address) {
2595         Address *net_address;
2596
2597         assert(link);
2598         assert(address);
2599
2600         if (!link->network)
2601                 return false;
2602
2603         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2604                 if (address_equal(net_address, address))
2605                         return true;
2606
2607         return false;
2608 }
2609
2610 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2611         Neighbor *net_neighbor;
2612
2613         assert(link);
2614         assert(neighbor);
2615
2616         if (!link->network)
2617                 return false;
2618
2619         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2620                 if (neighbor_equal(net_neighbor, neighbor))
2621                         return true;
2622
2623         return false;
2624 }
2625
2626 static bool link_is_static_route_configured(Link *link, Route *route) {
2627         Route *net_route;
2628
2629         assert(link);
2630         assert(route);
2631
2632         if (!link->network)
2633                 return false;
2634
2635         LIST_FOREACH(routes, net_route, link->network->static_routes)
2636                 if (route_equal(net_route, route))
2637                         return true;
2638
2639         return false;
2640 }
2641
2642 static bool link_address_is_dynamic(Link *link, Address *address) {
2643         Route *route;
2644         Iterator i;
2645
2646         assert(link);
2647         assert(address);
2648
2649         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2650                 return true;
2651
2652         /* Even when the address is leased from a DHCP server, networkd assign the address
2653          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2654          * corresponding routes with RTPROT_DHCP. */
2655         SET_FOREACH(route, link->routes_foreign, i) {
2656                 if (route->protocol != RTPROT_DHCP)
2657                         continue;
2658
2659                 if (address->family != route->family)
2660                         continue;
2661
2662                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2663                         return true;
2664         }
2665
2666         return false;
2667 }
2668
2669 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2670         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2671         sd_netlink_message *addr;
2672         int r;
2673
2674         assert(link);
2675         assert(link->manager);
2676         assert(link->manager->rtnl);
2677
2678         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2679         if (r < 0)
2680                 return r;
2681
2682         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2683         if (r < 0)
2684                 return r;
2685
2686         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2687                 unsigned char flags;
2688                 int ifindex;
2689
2690                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2691                 if (r < 0) {
2692                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2693                         continue;
2694                 } else if (link->ifindex != ifindex)
2695                         continue;
2696
2697                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2698                 if (r < 0) {
2699                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2700                         continue;
2701                 } else if (!(flags & IFA_F_TENTATIVE))
2702                         continue;
2703
2704                 log_link_debug(link, "Found tentative ipv6 link-local address");
2705                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2706         }
2707
2708         return 0;
2709 }
2710
2711 static int link_drop_foreign_config(Link *link) {
2712         Address *address;
2713         Neighbor *neighbor;
2714         Route *route;
2715         Iterator i;
2716         int r;
2717
2718         /* The kernel doesn't notify us about tentative addresses;
2719          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2720         if (!link_ipv6ll_enabled(link)) {
2721                 r = link_enumerate_ipv6_tentative_addresses(link);
2722                 if (r < 0)
2723                         return r;
2724         }
2725
2726         SET_FOREACH(address, link->addresses_foreign, i) {
2727                 /* we consider IPv6LL addresses to be managed by the kernel */
2728                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2729                         continue;
2730
2731                 if (link_address_is_dynamic(link, address)) {
2732                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2733                                 continue;
2734                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2735                         continue;
2736
2737                 if (link_is_static_address_configured(link, address)) {
2738                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2739                         if (r < 0)
2740                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2741                 } else {
2742                         r = address_remove(address, link, NULL);
2743                         if (r < 0)
2744                                 return r;
2745                 }
2746         }
2747
2748         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2749                 if (link_is_neighbor_configured(link, neighbor)) {
2750                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2751                         if (r < 0)
2752                                 return r;
2753                 } else {
2754                         r = neighbor_remove(neighbor, link, NULL);
2755                         if (r < 0)
2756                                 return r;
2757                 }
2758         }
2759
2760         SET_FOREACH(route, link->routes_foreign, i) {
2761                 /* do not touch routes managed by the kernel */
2762                 if (route->protocol == RTPROT_KERNEL)
2763                         continue;
2764
2765                 /* do not touch multicast route added by kernel */
2766                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2767                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2768                 if (route->protocol == RTPROT_BOOT &&
2769                     route->family == AF_INET6 &&
2770                     route->dst_prefixlen == 8 &&
2771                     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 }}} }))
2772                         continue;
2773
2774                 if (route->protocol == RTPROT_STATIC && link->network &&
2775                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2776                         continue;
2777
2778                 if (route->protocol == RTPROT_DHCP && link->network &&
2779                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2780                         continue;
2781
2782                 if (link_is_static_route_configured(link, route)) {
2783                         r = route_add(link, route, NULL);
2784                         if (r < 0)
2785                                 return r;
2786                 } else {
2787                         r = route_remove(route, link, NULL);
2788                         if (r < 0)
2789                                 return r;
2790                 }
2791         }
2792
2793         return 0;
2794 }
2795
2796 static int link_drop_config(Link *link) {
2797         Address *address, *pool_address;
2798         Neighbor *neighbor;
2799         Route *route;
2800         Iterator i;
2801         int r;
2802
2803         SET_FOREACH(address, link->addresses, i) {
2804                 /* we consider IPv6LL addresses to be managed by the kernel */
2805                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2806                         continue;
2807
2808                 r = address_remove(address, link, NULL);
2809                 if (r < 0)
2810                         return r;
2811
2812                 /* If this address came from an address pool, clean up the pool */
2813                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2814                         if (address_equal(address, pool_address)) {
2815                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2816                                 address_free(pool_address);
2817                                 break;
2818                         }
2819                 }
2820         }
2821
2822         SET_FOREACH(neighbor, link->neighbors, i) {
2823                 r = neighbor_remove(neighbor, link, NULL);
2824                 if (r < 0)
2825                         return r;
2826         }
2827
2828         SET_FOREACH(route, link->routes, i) {
2829                 /* do not touch routes managed by the kernel */
2830                 if (route->protocol == RTPROT_KERNEL)
2831                         continue;
2832
2833                 r = route_remove(route, link, NULL);
2834                 if (r < 0)
2835                         return r;
2836         }
2837
2838         ndisc_flush(link);
2839
2840         return 0;
2841 }
2842
2843 static int link_configure_ipv4_dad(Link *link) {
2844         Address *address;
2845         int r;
2846
2847         assert(link);
2848         assert(link->network);
2849
2850         LIST_FOREACH(addresses, address, link->network->static_addresses)
2851                 if (address->family == AF_INET &&
2852                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2853                         r = configure_ipv4_duplicate_address_detection(link, address);
2854                         if (r < 0)
2855                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2856                 }
2857
2858         return 0;
2859 }
2860
2861 static int link_configure_traffic_control(Link *link) {
2862         TrafficControl *tc;
2863         Iterator i;
2864         int r;
2865
2866         link->tc_configured = false;
2867         link->tc_messages = 0;
2868
2869         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2870                 r = traffic_control_configure(link, tc);
2871                 if (r < 0)
2872                         return r;
2873         }
2874
2875         if (link->tc_messages == 0)
2876                 link->tc_configured = true;
2877         else
2878                 log_link_debug(link, "Configuring traffic control");
2879
2880         return 0;
2881 }
2882
2883 static int link_configure_sr_iov(Link *link) {
2884         SRIOV *sr_iov;
2885         Iterator i;
2886         int r;
2887
2888         link->sr_iov_configured = false;
2889         link->sr_iov_messages = 0;
2890
2891         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2892                 r = sr_iov_configure(link, sr_iov);
2893                 if (r < 0)
2894                         return r;
2895         }
2896
2897         if (link->sr_iov_messages == 0)
2898                 link->sr_iov_configured = true;
2899         else
2900                 log_link_debug(link, "Configuring SR-IOV");
2901
2902         return 0;
2903 }
2904
2905 static int link_configure(Link *link) {
2906         int r;
2907
2908         assert(link);
2909         assert(link->network);
2910         assert(link->state == LINK_STATE_INITIALIZED);
2911
2912         r = link_configure_traffic_control(link);
2913         if (r < 0)
2914                 return r;
2915
2916         r = link_configure_sr_iov(link);
2917         if (r < 0)
2918                 return r;
2919
2920         if (link->iftype == ARPHRD_CAN)
2921                 return link_configure_can(link);
2922
2923         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2924          * for this interface, then enable IPv6 */
2925         (void) link_update_ipv6_sysctl(link);
2926
2927         r = link_set_proxy_arp(link);
2928         if (r < 0)
2929                return r;
2930
2931         r = ipv6_proxy_ndp_addresses_configure(link);
2932         if (r < 0)
2933                 return r;
2934
2935         r = link_set_ipv4_forward(link);
2936         if (r < 0)
2937                 return r;
2938
2939         r = link_set_ipv6_forward(link);
2940         if (r < 0)
2941                 return r;
2942
2943         r = link_set_ipv6_privacy_extensions(link);
2944         if (r < 0)
2945                 return r;
2946
2947         r = link_set_ipv6_accept_ra(link);
2948         if (r < 0)
2949                 return r;
2950
2951         r = link_set_ipv6_dad_transmits(link);
2952         if (r < 0)
2953                 return r;
2954
2955         r = link_set_ipv6_hop_limit(link);
2956         if (r < 0)
2957                 return r;
2958
2959         r = link_set_ipv4_accept_local(link);
2960         if (r < 0)
2961                 return r;
2962
2963         r = link_set_flags(link);
2964         if (r < 0)
2965                 return r;
2966
2967         r = link_set_group(link);
2968         if (r < 0)
2969                 return r;
2970
2971         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2972                 r = ipv4ll_configure(link);
2973                 if (r < 0)
2974                         return r;
2975         }
2976
2977         if (link_dhcp4_enabled(link)) {
2978                 r = dhcp4_set_promote_secondaries(link);
2979                 if (r < 0)
2980                         return r;
2981
2982                 r = dhcp4_configure(link);
2983                 if (r < 0)
2984                         return r;
2985         }
2986
2987         if (link_dhcp4_server_enabled(link)) {
2988                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2989                 if (r < 0)
2990                         return r;
2991
2992                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2993                 if (r < 0)
2994                         return r;
2995         }
2996
2997         if (link_dhcp6_enabled(link) ||
2998             link_ipv6_accept_ra_enabled(link)) {
2999                 r = dhcp6_configure(link);
3000                 if (r < 0)
3001                         return r;
3002         }
3003
3004         if (link_ipv6_accept_ra_enabled(link)) {
3005                 r = ndisc_configure(link);
3006                 if (r < 0)
3007                         return r;
3008         }
3009
3010         if (link_radv_enabled(link)) {
3011                 r = radv_configure(link);
3012                 if (r < 0)
3013                         return r;
3014         }
3015
3016         if (link_lldp_rx_enabled(link)) {
3017                 r = link_lldp_rx_configure(link);
3018                 if (r < 0)
3019                         return r;
3020         }
3021
3022         r = link_configure_mtu(link);
3023         if (r < 0)
3024                 return r;
3025
3026         r = link_configure_addrgen_mode(link);
3027         if (r < 0)
3028                 return r;
3029
3030         r = link_configure_ipv4_dad(link);
3031         if (r < 0)
3032                 return r;
3033
3034         return link_configure_continue(link);
3035 }
3036
3037 /* The configuration continues in this separate function, instead of
3038  * including this in the above link_configure() function, for two
3039  * reasons:
3040  * 1) some devices reset the link when the mtu is set, which caused
3041  *    an infinite loop here in networkd; see:
3042  *    https://github.com/systemd/systemd/issues/6593
3043  *    https://github.com/systemd/systemd/issues/9831
3044  * 2) if ipv6ll is disabled, then bringing the interface up must be
3045  *    delayed until after we get confirmation from the kernel that
3046  *    the addr_gen_mode parameter has been set (via netlink), see:
3047  *    https://github.com/systemd/systemd/issues/13882
3048  */
3049 static int link_configure_continue(Link *link) {
3050         int r;
3051
3052         assert(link);
3053         assert(link->network);
3054         assert(link->state == LINK_STATE_INITIALIZED);
3055
3056         if (link->setting_mtu || link->setting_genmode)
3057                 return 0;
3058
3059         /* Drop foreign config, but ignore loopback or critical devices.
3060          * We do not want to remove loopback address or addresses used for root NFS. */
3061         if (!(link->flags & IFF_LOOPBACK) &&
3062             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3063                 r = link_drop_foreign_config(link);
3064                 if (r < 0)
3065                         return r;
3066         }
3067
3068         /* The kernel resets ipv6 mtu after changing device mtu;
3069          * we must set this here, after we've set device mtu */
3070         r = link_set_ipv6_mtu(link);
3071         if (r < 0)
3072                 return r;
3073
3074         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3075                 r = link_acquire_conf(link);
3076                 if (r < 0)
3077                         return r;
3078         }
3079
3080         return link_enter_join_netdev(link);
3081 }
3082
3083 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3084         assert(duid);
3085
3086         if (duid->raw_data_len > 0)
3087                 return 0;
3088
3089         if (duid->type != DUID_TYPE_UUID)
3090                 return -EINVAL;
3091
3092         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3093         duid->raw_data_len = sizeof(sd_id128_t);
3094
3095         return 1;
3096 }
3097
3098 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3099         Manager *manager = userdata;
3100         const sd_bus_error *e;
3101         const void *a;
3102         size_t sz;
3103         DUID *duid;
3104         Link *link;
3105         int r;
3106
3107         assert(m);
3108         assert(manager);
3109
3110         e = sd_bus_message_get_error(m);
3111         if (e) {
3112                 log_error_errno(sd_bus_error_get_errno(e),
3113                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3114                                 e->message);
3115                 goto configure;
3116         }
3117
3118         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3119         if (r < 0)
3120                 goto configure;
3121
3122         if (sz != sizeof(sd_id128_t)) {
3123                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3124                 goto configure;
3125         }
3126
3127         memcpy(&manager->product_uuid, a, sz);
3128         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3129                 (void) duid_set_uuid(duid, manager->product_uuid);
3130
3131         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3132
3133 configure:
3134         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3135                 link_unref(link);
3136
3137                 r = link_configure(link);
3138                 if (r < 0)
3139                         link_enter_failed(link);
3140         }
3141
3142         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3143
3144         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3145          * even if the method fails. */
3146         manager->has_product_uuid = true;
3147
3148         return 1;
3149 }
3150
3151 static bool link_requires_uuid(Link *link) {
3152         const DUID *duid;
3153
3154         assert(link);
3155         assert(link->manager);
3156         assert(link->network);
3157
3158         duid = link_get_duid(link);
3159         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3160                 return false;
3161
3162         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3163                 return true;
3164
3165         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3166                 return true;
3167
3168         return false;
3169 }
3170
3171 static int link_configure_duid(Link *link) {
3172         Manager *m;
3173         DUID *duid;
3174         int r;
3175
3176         assert(link);
3177         assert(link->manager);
3178         assert(link->network);
3179
3180         m = link->manager;
3181         duid = link_get_duid(link);
3182
3183         if (!link_requires_uuid(link))
3184                 return 1;
3185
3186         if (m->has_product_uuid) {
3187                 (void) duid_set_uuid(duid, m->product_uuid);
3188                 return 1;
3189         }
3190
3191         if (!m->links_requesting_uuid) {
3192                 r = manager_request_product_uuid(m, link);
3193                 if (r < 0) {
3194                         if (r == -ENOMEM)
3195                                 return r;
3196
3197                         log_link_warning_errno(link, r,
3198                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3199                         return 1;
3200                 }
3201         } else {
3202                 r = set_put(m->links_requesting_uuid, link);
3203                 if (r < 0)
3204                         return log_oom();
3205                 if (r > 0)
3206                         link_ref(link);
3207
3208                 r = set_put(m->duids_requesting_uuid, duid);
3209                 if (r < 0)
3210                         return log_oom();
3211         }
3212
3213         return 0;
3214 }
3215
3216 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3217         Network *network;
3218         int r;
3219
3220         if (m) {
3221                 _cleanup_strv_free_ char **s = NULL;
3222
3223                 r = sd_netlink_message_get_errno(m);
3224                 if (r < 0)
3225                         return r;
3226
3227                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3228                 if (r < 0 && r != -ENODATA)
3229                         return r;
3230
3231                 strv_free_and_replace(link->alternative_names, s);
3232         }
3233
3234         r = network_get(link->manager, link->iftype, link->sd_device,
3235                         link->ifname, link->alternative_names, link->driver,
3236                         &link->mac, &link->permanent_mac,
3237                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3238         if (r == -ENOENT) {
3239                 link_enter_unmanaged(link);
3240                 return 0;
3241         } else if (r == 0 && network->unmanaged) {
3242                 link_enter_unmanaged(link);
3243                 return 0;
3244         } else if (r < 0)
3245                 return r;
3246
3247         if (link->network == network && !force)
3248                 return 0;
3249
3250         log_link_info(link, "Re-configuring with %s", network->filename);
3251
3252         /* Dropping old .network file */
3253         r = link_stop_clients(link, false);
3254         if (r < 0)
3255                 return r;
3256
3257         if (link_dhcp4_server_enabled(link))
3258                 (void) sd_dhcp_server_stop(link->dhcp_server);
3259
3260         r = link_drop_config(link);
3261         if (r < 0)
3262                 return r;
3263
3264         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3265                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3266                 r = link_drop_foreign_config(link);
3267                 if (r < 0)
3268                         return r;
3269         }
3270
3271         link_free_carrier_maps(link);
3272         link_free_engines(link);
3273         link->network = network_unref(link->network);
3274
3275         /* Then, apply new .network file */
3276         r = network_apply(network, link);
3277         if (r < 0)
3278                 return r;
3279
3280         r = link_new_carrier_maps(link);
3281         if (r < 0)
3282                 return r;
3283
3284         link_set_state(link, LINK_STATE_INITIALIZED);
3285         link_dirty(link);
3286
3287         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3288          * link_configure() is called later asynchronously. */
3289         r = link_configure_duid(link);
3290         if (r <= 0)
3291                 return r;
3292
3293         r = link_configure(link);
3294         if (r < 0)
3295                 return r;
3296
3297         return 0;
3298 }
3299
3300 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3301         int r;
3302
3303         r = link_reconfigure_internal(link, m, false);
3304         if (r < 0)
3305                 link_enter_failed(link);
3306
3307         return 1;
3308 }
3309
3310 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3311         int r;
3312
3313         r = link_reconfigure_internal(link, m, true);
3314         if (r < 0)
3315                 link_enter_failed(link);
3316
3317         return 1;
3318 }
3319
3320 int link_reconfigure(Link *link, bool force) {
3321         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3322         int r;
3323
3324         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3325                 return 0;
3326
3327         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3328                                      link->ifindex);
3329         if (r < 0)
3330                 return r;
3331
3332         r = netlink_call_async(link->manager->rtnl, NULL, req,
3333                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3334                                link_netlink_destroy_callback, link);
3335         if (r < 0)
3336                 return r;
3337
3338         link_ref(link);
3339
3340         return 0;
3341 }
3342
3343 static int link_initialized_and_synced(Link *link) {
3344         Network *network;
3345         int r;
3346
3347         assert(link);
3348         assert(link->ifname);
3349         assert(link->manager);
3350
3351         /* We may get called either from the asynchronous netlink callback,
3352          * or directly for link_add() if running in a container. See link_add(). */
3353         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3354                 return 0;
3355
3356         log_link_debug(link, "Link state is up-to-date");
3357         link_set_state(link, LINK_STATE_INITIALIZED);
3358
3359         r = link_new_bound_by_list(link);
3360         if (r < 0)
3361                 return r;
3362
3363         r = link_handle_bound_by_list(link);
3364         if (r < 0)
3365                 return r;
3366
3367         if (!link->network) {
3368                 r = wifi_get_info(link);
3369                 if (r < 0)
3370                         return r;
3371
3372                 r = network_get(link->manager, link->iftype, link->sd_device,
3373                                 link->ifname, link->alternative_names, link->driver,
3374                                 &link->mac, &link->permanent_mac,
3375                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3376                 if (r == -ENOENT) {
3377                         link_enter_unmanaged(link);
3378                         return 0;
3379                 } else if (r == 0 && network->unmanaged) {
3380                         link_enter_unmanaged(link);
3381                         return 0;
3382                 } else if (r < 0)
3383                         return r;
3384
3385                 if (link->flags & IFF_LOOPBACK) {
3386                         if (network->link_local != ADDRESS_FAMILY_NO)
3387                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3388
3389                         if (network->dhcp != ADDRESS_FAMILY_NO)
3390                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3391
3392                         if (network->dhcp_server)
3393                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3394                 }
3395
3396                 r = network_apply(network, link);
3397                 if (r < 0)
3398                         return r;
3399         }
3400
3401         r = link_new_bound_to_list(link);
3402         if (r < 0)
3403                 return r;
3404
3405         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3406          * link_configure() is called later asynchronously. */
3407         r = link_configure_duid(link);
3408         if (r <= 0)
3409                 return r;
3410
3411         r = link_configure(link);
3412         if (r < 0)
3413                 return r;
3414
3415         return 0;
3416 }
3417
3418 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3419         _cleanup_strv_free_ char **s = NULL;
3420         int r;
3421
3422         r = sd_netlink_message_get_errno(m);
3423         if (r < 0) {
3424                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3425                 link_enter_failed(link);
3426                 return 0;
3427         }
3428
3429         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3430         if (r < 0 && r != -ENODATA) {
3431                 link_enter_failed(link);
3432                 return 0;
3433         }
3434
3435         strv_free_and_replace(link->alternative_names, s);
3436
3437         r = link_initialized_and_synced(link);
3438         if (r < 0)
3439                 link_enter_failed(link);
3440         return 1;
3441 }
3442
3443 int link_initialized(Link *link, sd_device *device) {
3444         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3445         int r;
3446
3447         assert(link);
3448         assert(link->manager);
3449         assert(link->manager->rtnl);
3450         assert(device);
3451
3452         if (link->state != LINK_STATE_PENDING)
3453                 return 0;
3454
3455         if (link->sd_device)
3456                 return 0;
3457
3458         log_link_debug(link, "udev initialized link");
3459         link_set_state(link, LINK_STATE_INITIALIZED);
3460
3461         link->sd_device = sd_device_ref(device);
3462
3463         /* udev has initialized the link, but we don't know if we have yet
3464          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3465          * when it returns we know that the pending NEWLINKs have already been
3466          * processed and that we are up-to-date */
3467
3468         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3469                                      link->ifindex);
3470         if (r < 0)
3471                 return r;
3472
3473         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3474                                link_netlink_destroy_callback, link);
3475         if (r < 0)
3476                 return r;
3477
3478         link_ref(link);
3479
3480         return 0;
3481 }
3482
3483 static int link_load(Link *link) {
3484         _cleanup_free_ char *network_file = NULL,
3485                             *addresses = NULL,
3486                             *routes = NULL,
3487                             *dhcp4_address = NULL,
3488                             *ipv4ll_address = NULL;
3489         union in_addr_union address;
3490         int r;
3491
3492         assert(link);
3493
3494         r = parse_env_file(NULL, link->state_file,
3495                            "NETWORK_FILE", &network_file,
3496                            "ADDRESSES", &addresses,
3497                            "ROUTES", &routes,
3498                            "DHCP4_ADDRESS", &dhcp4_address,
3499                            "IPV4LL_ADDRESS", &ipv4ll_address);
3500         if (r < 0 && r != -ENOENT)
3501                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3502
3503         if (network_file) {
3504                 Network *network;
3505                 char *suffix;
3506
3507                 /* drop suffix */
3508                 suffix = strrchr(network_file, '.');
3509                 if (!suffix) {
3510                         log_link_debug(link, "Failed to get network name from %s", network_file);
3511                         goto network_file_fail;
3512                 }
3513                 *suffix = '\0';
3514
3515                 r = network_get_by_name(link->manager, basename(network_file), &network);
3516                 if (r < 0) {
3517                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3518                         goto network_file_fail;
3519                 }
3520
3521                 r = network_apply(network, link);
3522                 if (r < 0)
3523                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3524         }
3525
3526 network_file_fail:
3527
3528         for (const char *p = addresses; p; ) {
3529                 _cleanup_free_ char *address_str = NULL;
3530                 char *prefixlen_str;
3531                 int family;
3532                 unsigned char prefixlen;
3533
3534                 r = extract_first_word(&p, &address_str, NULL, 0);
3535                 if (r < 0)
3536                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3537                 if (r <= 0)
3538                         break;
3539
3540                 prefixlen_str = strchr(address_str, '/');
3541                 if (!prefixlen_str) {
3542                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3543                         continue;
3544                 }
3545                 *prefixlen_str++ = '\0';
3546
3547                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3548                 if (r != 1) {
3549                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3550                         continue;
3551                 }
3552
3553                 r = in_addr_from_string_auto(address_str, &family, &address);
3554                 if (r < 0) {
3555                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3556                         continue;
3557                 }
3558
3559                 r = address_add(link, family, &address, prefixlen, NULL);
3560                 if (r < 0)
3561                         return log_link_error_errno(link, r, "Failed to add address: %m");
3562         }
3563
3564         for (const char *p = routes; p; ) {
3565                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3566                 _cleanup_(route_freep) Route *tmp = NULL;
3567                 _cleanup_free_ char *route_str = NULL;
3568                 char *prefixlen_str;
3569                 Route *route;
3570
3571                 r = extract_first_word(&p, &route_str, NULL, 0);
3572                 if (r < 0)
3573                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3574                 if (r <= 0)
3575                         break;
3576
3577                 prefixlen_str = strchr(route_str, '/');
3578                 if (!prefixlen_str) {
3579                         log_link_debug(link, "Failed to parse route %s", route_str);
3580                         continue;
3581                 }
3582                 *prefixlen_str++ = '\0';
3583
3584                 r = route_new(&tmp);
3585                 if (r < 0)
3586                         return log_oom();
3587
3588                 r = sscanf(prefixlen_str,
3589                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3590                            &tmp->dst_prefixlen,
3591                            &tmp->tos,
3592                            &tmp->priority,
3593                            &tmp->table,
3594                            &tmp->lifetime);
3595                 if (r != 5) {
3596                         log_link_debug(link,
3597                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3598                                        prefixlen_str);
3599                         continue;
3600                 }
3601
3602                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3603                 if (r < 0) {
3604                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3605                         continue;
3606                 }
3607
3608                 r = route_add(link, tmp, &route);
3609                 if (r < 0)
3610                         return log_link_error_errno(link, r, "Failed to add route: %m");
3611
3612                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3613                         r = sd_event_add_time(link->manager->event, &expire,
3614                                               clock_boottime_or_monotonic(),
3615                                               route->lifetime, 0, route_expire_handler, route);
3616                         if (r < 0)
3617                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3618                 }
3619
3620                 sd_event_source_unref(route->expire);
3621                 route->expire = TAKE_PTR(expire);
3622         }
3623
3624         if (dhcp4_address) {
3625                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3626                 if (r < 0) {
3627                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3628                         goto dhcp4_address_fail;
3629                 }
3630
3631                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3632                 if (r < 0)
3633                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3634
3635                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3636                 if (r < 0)
3637                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3638
3639                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3640                 if (r < 0)
3641                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3642         }
3643
3644 dhcp4_address_fail:
3645
3646         if (ipv4ll_address) {
3647                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3648                 if (r < 0) {
3649                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3650                         goto ipv4ll_address_fail;
3651                 }
3652
3653                 r = sd_ipv4ll_new(&link->ipv4ll);
3654                 if (r < 0)
3655                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3656
3657                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3658                 if (r < 0)
3659                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3660
3661                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3662                 if (r < 0)
3663                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3664         }
3665
3666 ipv4ll_address_fail:
3667
3668         return 0;
3669 }
3670
3671 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3672         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3673         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3674         Link *link;
3675         int r;
3676
3677         assert(m);
3678         assert(m->rtnl);
3679         assert(message);
3680         assert(ret);
3681
3682         r = link_new(m, message, ret);
3683         if (r < 0)
3684                 return r;
3685
3686         link = *ret;
3687
3688         log_link_debug(link, "Link %d added", link->ifindex);
3689
3690         r = link_load(link);
3691         if (r < 0)
3692                 return r;
3693
3694         if (path_is_read_only_fs("/sys") <= 0) {
3695                 /* udev should be around */
3696                 sprintf(ifindex_str, "n%d", link->ifindex);
3697                 r = sd_device_new_from_device_id(&device, ifindex_str);
3698                 if (r < 0) {
3699                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3700                         return 0;
3701                 }
3702
3703                 r = sd_device_get_is_initialized(device);
3704                 if (r < 0) {
3705                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3706                         goto failed;
3707                 }
3708                 if (r == 0) {
3709                         /* not yet ready */
3710                         log_link_debug(link, "link pending udev initialization...");
3711                         return 0;
3712                 }
3713
3714                 r = device_is_renaming(device);
3715                 if (r < 0) {
3716                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3717                         goto failed;
3718                 }
3719                 if (r > 0) {
3720                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3721                         return 0;
3722                 }
3723
3724                 r = link_initialized(link, device);
3725                 if (r < 0)
3726                         goto failed;
3727         } else {
3728                 r = link_initialized_and_synced(link);
3729                 if (r < 0)
3730                         goto failed;
3731         }
3732
3733         return 0;
3734 failed:
3735         link_enter_failed(link);
3736         return r;
3737 }
3738
3739 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3740         int r;
3741
3742         assert(link);
3743
3744         log_link_info(link, "Gained IPv6LL");
3745
3746         link->ipv6ll_address = *address;
3747         link_check_ready(link);
3748
3749         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3750                 r = link_acquire_ipv6_conf(link);
3751                 if (r < 0) {
3752                         link_enter_failed(link);
3753                         return r;
3754                 }
3755         }
3756
3757         return 0;
3758 }
3759
3760 static int link_carrier_gained(Link *link) {
3761         int r;
3762
3763         assert(link);
3764
3765         r = wifi_get_info(link);
3766         if (r < 0)
3767                 return r;
3768         if (r > 0) {
3769                 r = link_reconfigure_internal(link, NULL, false);
3770                 if (r < 0) {
3771                         link_enter_failed(link);
3772                         return r;
3773                 }
3774         }
3775
3776         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3777                 r = link_acquire_conf(link);
3778                 if (r < 0) {
3779                         link_enter_failed(link);
3780                         return r;
3781                 }
3782
3783                 link_set_state(link, LINK_STATE_CONFIGURING);
3784                 r = link_request_set_addresses(link);
3785                 if (r < 0)
3786                         return r;
3787         }
3788
3789         r = link_handle_bound_by_list(link);
3790         if (r < 0)
3791                 return r;
3792
3793         return 0;
3794 }
3795
3796 static int link_carrier_lost(Link *link) {
3797         int r;
3798
3799         assert(link);
3800
3801         if (link->network && link->network->ignore_carrier_loss)
3802                 return 0;
3803
3804         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3805          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3806          * configuration and stop the clients as well. */
3807         if (link->setting_mtu)
3808                 return 0;
3809
3810         r = link_stop_clients(link, false);
3811         if (r < 0) {
3812                 link_enter_failed(link);
3813                 return r;
3814         }
3815
3816         if (link_dhcp4_server_enabled(link))
3817                 (void) sd_dhcp_server_stop(link->dhcp_server);
3818
3819         r = link_drop_config(link);
3820         if (r < 0)
3821                 return r;
3822
3823         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3824                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3825                 r = link_drop_foreign_config(link);
3826                 if (r < 0)
3827                         return r;
3828         }
3829
3830         r = link_handle_bound_by_list(link);
3831         if (r < 0)
3832                 return r;
3833
3834         return 0;
3835 }
3836
3837 int link_carrier_reset(Link *link) {
3838         int r;
3839
3840         assert(link);
3841
3842         if (link_has_carrier(link)) {
3843                 r = link_carrier_lost(link);
3844                 if (r < 0)
3845                         return r;
3846
3847                 r = link_carrier_gained(link);
3848                 if (r < 0)
3849                         return r;
3850
3851                 log_link_info(link, "Reset carrier");
3852         }
3853
3854         return 0;
3855 }
3856
3857 /* This is called every time an interface admin state changes to up;
3858  * specifically, when IFF_UP flag changes from unset to set */
3859 static int link_admin_state_up(Link *link) {
3860         int r;
3861
3862         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3863          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3864          * ipv6_mtu_set prevents this from trying to set it too early before
3865          * the link->network has been setup; we only need to reset it
3866          * here if we've already set it during normal initialization. */
3867         if (link->ipv6_mtu_set) {
3868                 r = link_set_ipv6_mtu(link);
3869                 if (r < 0)
3870                         return r;
3871         }
3872
3873         return 0;
3874 }
3875
3876 int link_update(Link *link, sd_netlink_message *m) {
3877         _cleanup_strv_free_ char **s = NULL;
3878         struct ether_addr mac;
3879         const char *ifname;
3880         uint32_t mtu;
3881         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3882         int old_master, r;
3883
3884         assert(link);
3885         assert(link->ifname);
3886         assert(m);
3887
3888         if (link->state == LINK_STATE_LINGER) {
3889                 log_link_info(link, "Link re-added");
3890                 link_set_state(link, LINK_STATE_CONFIGURING);
3891
3892                 r = link_new_carrier_maps(link);
3893                 if (r < 0)
3894                         return r;
3895         }
3896
3897         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3898         if (r >= 0 && !streq(ifname, link->ifname)) {
3899                 Manager *manager = link->manager;
3900
3901                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3902
3903                 link_drop(link);
3904                 r = link_add(manager, m, &link);
3905                 if (r < 0)
3906                         return r;
3907         }
3908
3909         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3910         if (r >= 0)
3911                 strv_free_and_replace(link->alternative_names, s);
3912
3913         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3914         if (r >= 0 && mtu > 0) {
3915                 link->mtu = mtu;
3916                 if (link->original_mtu == 0) {
3917                         link->original_mtu = mtu;
3918                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3919                 }
3920
3921                 if (link->dhcp_client) {
3922                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3923                                                    link->mtu);
3924                         if (r < 0)
3925                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3926                 }
3927
3928                 if (link->radv) {
3929                         r = sd_radv_set_mtu(link->radv, link->mtu);
3930                         if (r < 0)
3931                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3932                 }
3933         }
3934
3935         /* The kernel may broadcast NEWLINK messages without the MAC address
3936            set, simply ignore them. */
3937         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3938         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
3939
3940                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
3941
3942                 log_link_debug(link, "Gained new 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                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
3953
3954                         if (restart) {
3955                                 r = sd_ipv4ll_stop(link->ipv4ll);
3956                                 if (r < 0)
3957                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
3958                         }
3959
3960                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3961                         if (r < 0)
3962                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3963
3964                         if (restart) {
3965                                 r = sd_ipv4ll_start(link->ipv4ll);
3966                                 if (r < 0)
3967                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
3968                         }
3969                 }
3970
3971                 if (link->dhcp_client) {
3972                         r = sd_dhcp_client_set_mac(link->dhcp_client,
3973                                                    (const uint8_t *) &link->mac,
3974                                                    sizeof (link->mac),
3975                                                    ARPHRD_ETHER);
3976                         if (r < 0)
3977                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3978
3979                         r = dhcp4_set_client_identifier(link);
3980                         if (r < 0)
3981                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
3982                 }
3983
3984                 if (link->dhcp6_client) {
3985                         const DUID* duid = link_get_duid(link);
3986                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
3987
3988                         if (restart) {
3989                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
3990                                 if (r < 0)
3991                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
3992                         }
3993
3994                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3995                                                     (const uint8_t *) &link->mac,
3996                                                     sizeof (link->mac),
3997                                                     ARPHRD_ETHER);
3998                         if (r < 0)
3999                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4000
4001                         if (link->network->iaid_set) {
4002                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4003                                 if (r < 0)
4004                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4005                         }
4006
4007                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4008                                                      duid->type,
4009                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4010                                                      duid->raw_data_len);
4011                         if (r < 0)
4012                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4013
4014                         if (restart) {
4015                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4016                                 if (r < 0)
4017                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4018                         }
4019                 }
4020
4021                 if (link->radv) {
4022                         bool restart = sd_radv_is_running(link->radv);
4023
4024                         if (restart) {
4025                                 r = sd_radv_stop(link->radv);
4026                                 if (r < 0)
4027                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4028                         }
4029
4030                         r = sd_radv_set_mac(link->radv, &link->mac);
4031                         if (r < 0)
4032                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4033
4034                         if (restart) {
4035                                 r = sd_radv_start(link->radv);
4036                                 if (r < 0)
4037                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4038                         }
4039                 }
4040
4041                 if (link->ndisc) {
4042                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4043                         if (r < 0)
4044                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4045                 }
4046         }
4047
4048         old_master = link->master_ifindex;
4049         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4050
4051         link_was_admin_up = link->flags & IFF_UP;
4052         had_carrier = link_has_carrier(link);
4053
4054         r = link_update_flags(link, m, old_master != link->master_ifindex);
4055         if (r < 0)
4056                 return r;
4057
4058         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4059                 log_link_info(link, "Link UP");
4060
4061                 r = link_admin_state_up(link);
4062                 if (r < 0)
4063                         return r;
4064         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4065                 log_link_info(link, "Link DOWN");
4066
4067         r = link_update_lldp(link);
4068         if (r < 0)
4069                 return r;
4070
4071         carrier_gained = !had_carrier && link_has_carrier(link);
4072         carrier_lost = had_carrier && !link_has_carrier(link);
4073
4074         if (carrier_gained) {
4075                 log_link_info(link, "Gained carrier");
4076
4077                 r = link_carrier_gained(link);
4078                 if (r < 0)
4079                         return r;
4080         } else if (carrier_lost) {
4081                 log_link_info(link, "Lost carrier");
4082
4083                 r = link_carrier_lost(link);
4084                 if (r < 0)
4085                         return r;
4086         }
4087
4088         return 0;
4089 }
4090
4091 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4092         bool space = false;
4093         Iterator i;
4094         Link *link;
4095
4096         assert(f);
4097         assert(prefix);
4098
4099         if (hashmap_isempty(h))
4100                 return;
4101
4102         fputs(prefix, f);
4103         HASHMAP_FOREACH(link, h, i) {
4104                 if (space)
4105                         fputc(' ', f);
4106
4107                 fprintf(f, "%i", link->ifindex);
4108                 space = true;
4109         }
4110
4111         fputc('\n', f);
4112 }
4113
4114 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4115         for (unsigned j = 0; j < n_dns; j++) {
4116                 const char *str;
4117
4118                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4119                         continue;
4120
4121                 str = in_addr_full_to_string(dns[j]);
4122                 if (!str)
4123                         continue;
4124
4125                 if (*space)
4126                         fputc(' ', f);
4127                 fputs(str, f);
4128                 *space = true;
4129         }
4130 }
4131
4132 static void serialize_addresses(
4133                 FILE *f,
4134                 const char *lvalue,
4135                 bool *space,
4136                 char **addresses,
4137                 sd_dhcp_lease *lease,
4138                 bool conditional,
4139                 sd_dhcp_lease_server_type what,
4140                 sd_dhcp6_lease *lease6,
4141                 bool conditional6,
4142                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4143                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4144         int r;
4145
4146         bool _space = false;
4147         if (!space)
4148                 space = &_space;
4149
4150         if (lvalue)
4151                 fprintf(f, "%s=", lvalue);
4152         fputstrv(f, addresses, NULL, space);
4153
4154         if (lease && conditional) {
4155                 const struct in_addr *lease_addresses;
4156
4157                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4158                 if (r > 0)
4159                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4160         }
4161
4162         if (lease6 && conditional6 && lease6_get_addr) {
4163                 const struct in6_addr *in6_addrs;
4164
4165                 r = lease6_get_addr(lease6, &in6_addrs);
4166                 if (r > 0)
4167                         serialize_in6_addrs(f, in6_addrs, r, space);
4168         }
4169
4170         if (lease6 && conditional6 && lease6_get_fqdn) {
4171                 char **in6_hosts;
4172
4173                 r = lease6_get_fqdn(lease6, &in6_hosts);
4174                 if (r > 0)
4175                         fputstrv(f, in6_hosts, NULL, space);
4176         }
4177
4178         if (lvalue)
4179                 fputc('\n', f);
4180 }
4181
4182 int link_save(Link *link) {
4183         const char *admin_state, *oper_state, *carrier_state, *address_state;
4184         _cleanup_free_ char *temp_path = NULL;
4185         _cleanup_fclose_ FILE *f = NULL;
4186         Route *route;
4187         Address *a;
4188         Iterator i;
4189         int r;
4190
4191         assert(link);
4192         assert(link->state_file);
4193         assert(link->lease_file);
4194         assert(link->manager);
4195
4196         if (link->state == LINK_STATE_LINGER) {
4197                 (void) unlink(link->state_file);
4198                 return 0;
4199         }
4200
4201         link_lldp_save(link);
4202
4203         admin_state = link_state_to_string(link->state);
4204         assert(admin_state);
4205
4206         oper_state = link_operstate_to_string(link->operstate);
4207         assert(oper_state);
4208
4209         carrier_state = link_carrier_state_to_string(link->carrier_state);
4210         assert(carrier_state);
4211
4212         address_state = link_address_state_to_string(link->address_state);
4213         assert(address_state);
4214
4215         r = fopen_temporary(link->state_file, &f, &temp_path);
4216         if (r < 0)
4217                 goto fail;
4218
4219         (void) fchmod(fileno(f), 0644);
4220
4221         fprintf(f,
4222                 "# This is private data. Do not parse.\n"
4223                 "ADMIN_STATE=%s\n"
4224                 "OPER_STATE=%s\n"
4225                 "CARRIER_STATE=%s\n"
4226                 "ADDRESS_STATE=%s\n",
4227                 admin_state, oper_state, carrier_state, address_state);
4228
4229         if (link->network) {
4230                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4231                 const char *dhcp_domainname = NULL, *p;
4232                 sd_dhcp6_lease *dhcp6_lease = NULL;
4233                 bool space;
4234
4235                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4236                         yes_no(link->network->required_for_online));
4237
4238                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4239                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4240                         strempty(link_operstate_to_string(st.min)),
4241                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4242                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4243
4244                 if (link->dhcp6_client) {
4245                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4246                         if (r < 0 && r != -ENOMSG)
4247                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4248                 }
4249
4250                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4251
4252                 /************************************************************/
4253
4254                 fputs("DNS=", f);
4255                 space = false;
4256                 if (link->n_dns != (unsigned) -1)
4257                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4258                 else
4259                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4260
4261                 serialize_addresses(f, NULL, &space,
4262                                     NULL,
4263                                     link->dhcp_lease,
4264                                     link->network->dhcp_use_dns,
4265                                     SD_DHCP_LEASE_DNS,
4266                                     dhcp6_lease,
4267                                     link->network->dhcp6_use_dns,
4268                                     sd_dhcp6_lease_get_dns,
4269                                     NULL);
4270
4271                 /* Make sure to flush out old entries before we use the NDisc data */
4272                 ndisc_vacuum(link);
4273
4274                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4275                         NDiscRDNSS *dd;
4276
4277                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4278                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4279                 }
4280
4281                 fputc('\n', f);
4282
4283                 /************************************************************/
4284
4285                 serialize_addresses(f, "NTP", NULL,
4286                                     link->ntp ?: link->network->ntp,
4287                                     link->dhcp_lease,
4288                                     link->network->dhcp_use_ntp,
4289                                     SD_DHCP_LEASE_NTP,
4290                                     dhcp6_lease,
4291                                     link->network->dhcp6_use_ntp,
4292                                     sd_dhcp6_lease_get_ntp_addrs,
4293                                     sd_dhcp6_lease_get_ntp_fqdn);
4294
4295                 serialize_addresses(f, "SIP", NULL,
4296                                     NULL,
4297                                     link->dhcp_lease,
4298                                     link->network->dhcp_use_sip,
4299                                     SD_DHCP_LEASE_SIP,
4300                                     NULL, false, NULL, NULL);
4301
4302                 /************************************************************/
4303
4304                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4305                         if (link->dhcp_lease) {
4306                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4307                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4308                         }
4309                         if (dhcp6_lease)
4310                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4311                 }
4312
4313                 fputs("DOMAINS=", f);
4314                 space = false;
4315                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4316                         fputs_with_space(f, p, NULL, &space);
4317
4318                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4319                         if (dhcp_domainname)
4320                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4321                         if (dhcp_domains)
4322                                 fputstrv(f, dhcp_domains, NULL, &space);
4323                         if (dhcp6_domains)
4324                                 fputstrv(f, dhcp6_domains, NULL, &space);
4325                 }
4326
4327                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4328                         NDiscDNSSL *dd;
4329
4330                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4331                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4332                 }
4333
4334                 fputc('\n', f);
4335
4336                 /************************************************************/
4337
4338                 fputs("ROUTE_DOMAINS=", f);
4339                 space = false;
4340                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4341                         fputs_with_space(f, p, NULL, &space);
4342
4343                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4344                         if (dhcp_domainname)
4345                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4346                         if (dhcp_domains)
4347                                 fputstrv(f, dhcp_domains, NULL, &space);
4348                         if (dhcp6_domains)
4349                                 fputstrv(f, dhcp6_domains, NULL, &space);
4350                 }
4351
4352                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4353                         NDiscDNSSL *dd;
4354
4355                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4356                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4357                 }
4358
4359                 fputc('\n', f);
4360
4361                 /************************************************************/
4362
4363                 fprintf(f, "LLMNR=%s\n",
4364                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4365
4366                 /************************************************************/
4367
4368                 fprintf(f, "MDNS=%s\n",
4369                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4370
4371                 /************************************************************/
4372
4373                 int dns_default_route =
4374                         link->dns_default_route >= 0 ? link->dns_default_route :
4375                         link->network->dns_default_route;
4376                 if (dns_default_route >= 0)
4377                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4378
4379                 /************************************************************/
4380
4381                 DnsOverTlsMode dns_over_tls_mode =
4382                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4383                         link->network->dns_over_tls_mode;
4384                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4385                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4386
4387                 /************************************************************/
4388
4389                 DnssecMode dnssec_mode =
4390                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4391                         link->network->dnssec_mode;
4392                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4393                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4394
4395                 /************************************************************/
4396
4397                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4398                 if (set_isempty(nta_anchors))
4399                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4400
4401                 if (!set_isempty(nta_anchors)) {
4402                         const char *n;
4403
4404                         fputs("DNSSEC_NTA=", f);
4405                         space = false;
4406                         SET_FOREACH(n, nta_anchors, i)
4407                                 fputs_with_space(f, n, NULL, &space);
4408                         fputc('\n', f);
4409                 }
4410
4411                 /************************************************************/
4412
4413                 fputs("ADDRESSES=", f);
4414                 space = false;
4415                 SET_FOREACH(a, link->addresses, i) {
4416                         _cleanup_free_ char *address_str = NULL;
4417
4418                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4419                         if (r < 0)
4420                                 goto fail;
4421
4422                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4423                         space = true;
4424                 }
4425                 fputc('\n', f);
4426
4427                 /************************************************************/
4428
4429                 fputs("ROUTES=", f);
4430                 space = false;
4431                 SET_FOREACH(route, link->routes, i) {
4432                         _cleanup_free_ char *route_str = NULL;
4433
4434                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4435                         if (r < 0)
4436                                 goto fail;
4437
4438                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4439                                 space ? " " : "", route_str,
4440                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4441                         space = true;
4442                 }
4443
4444                 fputc('\n', f);
4445         }
4446
4447         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4448         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4449
4450         if (link->dhcp_lease) {
4451                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4452                 if (r < 0)
4453                         goto fail;
4454
4455                 fprintf(f,
4456                         "DHCP_LEASE=%s\n",
4457                         link->lease_file);
4458         } else
4459                 (void) unlink(link->lease_file);
4460
4461         if (link->ipv4ll) {
4462                 struct in_addr address;
4463
4464                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4465                 if (r >= 0) {
4466                         fputs("IPV4LL_ADDRESS=", f);
4467                         serialize_in_addrs(f, &address, 1, false, NULL);
4468                         fputc('\n', f);
4469                 }
4470         }
4471
4472         if (link->dhcp6_client) {
4473                 _cleanup_free_ char *duid = NULL;
4474                 uint32_t iaid;
4475
4476                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4477                 if (r >= 0)
4478                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4479
4480                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4481                 if (r >= 0)
4482                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4483         }
4484
4485         r = fflush_and_check(f);
4486         if (r < 0)
4487                 goto fail;
4488
4489         if (rename(temp_path, link->state_file) < 0) {
4490                 r = -errno;
4491                 goto fail;
4492         }
4493
4494         return 0;
4495
4496 fail:
4497         (void) unlink(link->state_file);
4498         if (temp_path)
4499                 (void) unlink(temp_path);
4500
4501         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4502 }
4503
4504 /* The serialized state in /run is no longer up-to-date. */
4505 void link_dirty(Link *link) {
4506         int r;
4507
4508         assert(link);
4509
4510         /* mark manager dirty as link is dirty */
4511         manager_dirty(link->manager);
4512
4513         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4514         if (r <= 0)
4515                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4516                 return;
4517         link_ref(link);
4518 }
4519
4520 /* The serialized state in /run is up-to-date */
4521 void link_clean(Link *link) {
4522         assert(link);
4523         assert(link->manager);
4524
4525         link_unref(set_remove(link->manager->dirty_links, link));
4526 }
4527
4528 static const char* const link_state_table[_LINK_STATE_MAX] = {
4529         [LINK_STATE_PENDING] = "pending",
4530         [LINK_STATE_INITIALIZED] = "initialized",
4531         [LINK_STATE_CONFIGURING] = "configuring",
4532         [LINK_STATE_CONFIGURED] = "configured",
4533         [LINK_STATE_UNMANAGED] = "unmanaged",
4534         [LINK_STATE_FAILED] = "failed",
4535         [LINK_STATE_LINGER] = "linger",
4536 };
4537
4538 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4539
4540 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4541         const char *err_msg = NULL;
4542
4543         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4544         return log_link_full(link, level, err,
4545                              "%s: %s%s%s%m",
4546                              msg,
4547                              strempty(err_msg),
4548                              err_msg && !endswith(err_msg, ".") ? "." : "",
4549                              err_msg ? " " : "");
4550 }