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
 695         link->lldp = sd_lldp_unref(link->lldp);
 696
 697         ndisc_flush(link);
 698
 699         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 700         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 701         link->ndisc = sd_ndisc_unref(link->ndisc);
 702         link->radv = sd_radv_unref(link->radv);
 703 }
 704
 705 static Link *link_free(Link *link) {
 706         Address *address;
 707
 708         assert(link);
 709
 710         link_ntp_settings_clear(link);
 711         link_dns_settings_clear(link);
 712
 713         link->routes = set_free(link->routes);
 714         link->routes_foreign = set_free(link->routes_foreign);
 715         link->dhcp_routes = set_free(link->dhcp_routes);
 716         link->dhcp_routes_old = set_free(link->dhcp_routes_old);
 717         link->ndisc_routes = set_free(link->ndisc_routes);
 718         link->ndisc_routes_old = set_free(link->ndisc_routes_old);
 719
 720         link->nexthops = set_free(link->nexthops);
 721         link->nexthops_foreign = set_free(link->nexthops_foreign);
 722
 723         link->neighbors = set_free(link->neighbors);
 724         link->neighbors_foreign = set_free(link->neighbors_foreign);
 725
 726         link->addresses = set_free(link->addresses);
 727         link->addresses_foreign = set_free(link->addresses_foreign);
 728         link->ndisc_addresses = set_free(link->ndisc_addresses);
 729         link->ndisc_addresses_old = set_free(link->ndisc_addresses_old);
 730
 731         while ((address = link->pool_addresses)) {
 732                 LIST_REMOVE(addresses, link->pool_addresses, address);
 733                 address_free(address);
 734         }
 735
 736         link_lldp_emit_stop(link);
 737         link_free_engines(link);
 738         free(link->lease_file);
 739         free(link->lldp_file);
 740
 741         free(link->ifname);
 742         strv_free(link->alternative_names);
 743         free(link->kind);
 744         free(link->ssid);
 745         free(link->driver);
 746
 747         (void) unlink(link->state_file);
 748         free(link->state_file);
 749
 750         sd_device_unref(link->sd_device);
 751
 752         hashmap_free(link->bound_to_links);
 753         hashmap_free(link->bound_by_links);
 754
 755         set_free_with_destructor(link->slaves, link_unref);
 756
 757         network_unref(link->network);
 758
 759         return mfree(link);
 760 }
 761
 762 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 763
 764 int link_get(Manager *m, int ifindex, Link **ret) {
 765         Link *link;
 766
 767         assert(m);
 768         assert(ifindex > 0);
 769         assert(ret);
 770
 771         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 772         if (!link)
 773                 return -ENODEV;
 774
 775         *ret = link;
 776
 777         return 0;
 778 }
 779
 780 void link_set_state(Link *link, LinkState state) {
 781         assert(link);
 782
 783         if (link->state == state)
 784                 return;
 785
 786         log_link_debug(link, "State changed: %s -> %s",
 787                        link_state_to_string(link->state),
 788                        link_state_to_string(state));
 789
 790         link->state = state;
 791
 792         link_send_changed(link, "AdministrativeState", NULL);
 793 }
 794
 795 static void link_enter_unmanaged(Link *link) {
 796         assert(link);
 797
 798         link_set_state(link, LINK_STATE_UNMANAGED);
 799
 800         link_dirty(link);
 801 }
 802
 803 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 804         int r = 0, k;
 805         Address *ad;
 806
 807         assert(link);
 808         assert(link->manager);
 809         assert(link->manager->event);
 810
 811         bool keep_dhcp = may_keep_dhcp &&
 812                          link->network &&
 813                          (link->manager->restarting ||
 814                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 815
 816         if (link->dhcp_client && !keep_dhcp) {
 817                 k = sd_dhcp_client_stop(link->dhcp_client);
 818                 if (k < 0)
 819                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 820         }
 821
 822         if (link->ipv4ll) {
 823                 k = sd_ipv4ll_stop(link->ipv4ll);
 824                 if (k < 0)
 825                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 826         }
 827
 828         if (link->network)
 829                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 830                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 831                                 k = sd_ipv4acd_stop(ad->acd);
 832                                 if (k < 0)
 833                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 834                         }
 835
 836         if (link->dhcp6_client) {
 837                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 838                 if (k < 0)
 839                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 840         }
 841
 842         if (link->ndisc) {
 843                 k = sd_ndisc_stop(link->ndisc);
 844                 if (k < 0)
 845                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 846         }
 847
 848         if (link->radv) {
 849                 k = sd_radv_stop(link->radv);
 850                 if (k < 0)
 851                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 852         }
 853
 854         link_lldp_emit_stop(link);
 855         return r;
 856 }
 857
 858 void link_enter_failed(Link *link) {
 859         assert(link);
 860
 861         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 862                 return;
 863
 864         log_link_warning(link, "Failed");
 865
 866         link_set_state(link, LINK_STATE_FAILED);
 867
 868         link_stop_clients(link, false);
 869
 870         link_dirty(link);
 871 }
 872
 873 static int link_join_netdevs_after_configured(Link *link) {
 874         NetDev *netdev;
 875         Iterator i;
 876         int r;
 877
 878         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 879                 if (netdev->ifindex > 0)
 880                         /* Assume already enslaved. */
 881                         continue;
 882
 883                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 884                         continue;
 885
 886                 log_struct(LOG_DEBUG,
 887                            LOG_LINK_INTERFACE(link),
 888                            LOG_NETDEV_INTERFACE(netdev),
 889                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 890
 891                 r = netdev_join(netdev, link, NULL);
 892                 if (r < 0)
 893                         return log_struct_errno(LOG_WARNING, r,
 894                                                 LOG_LINK_INTERFACE(link),
 895                                                 LOG_NETDEV_INTERFACE(netdev),
 896                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 897         }
 898
 899         return 0;
 900 }
 901
 902 static void link_enter_configured(Link *link) {
 903         assert(link);
 904         assert(link->network);
 905
 906         if (link->state != LINK_STATE_CONFIGURING)
 907                 return;
 908
 909         link_set_state(link, LINK_STATE_CONFIGURED);
 910
 911         (void) link_join_netdevs_after_configured(link);
 912
 913         link_dirty(link);
 914 }
 915
 916 static int link_request_set_routing_policy_rule(Link *link) {
 917         RoutingPolicyRule *rule, *rrule = NULL;
 918         int r;
 919
 920         assert(link);
 921         assert(link->network);
 922
 923         link->routing_policy_rules_configured = false;
 924
 925         LIST_FOREACH(rules, rule, link->network->rules) {
 926                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 927                 if (r >= 0) {
 928                         if (r == 0)
 929                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 930                         continue;
 931                 }
 932
 933                 r = routing_policy_rule_configure(rule, link, NULL);
 934                 if (r < 0)
 935                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 936                 if (r > 0)
 937                         link->routing_policy_rule_messages++;
 938         }
 939
 940         routing_policy_rule_purge(link->manager, link);
 941         if (link->routing_policy_rule_messages == 0)
 942                 link->routing_policy_rules_configured = true;
 943         else {
 944                 log_link_debug(link, "Setting routing policy rules");
 945                 link_set_state(link, LINK_STATE_CONFIGURING);
 946         }
 947
 948         return 0;
 949 }
 950
 951 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 952         int r;
 953
 954         assert(link);
 955         assert(link->nexthop_messages > 0);
 956         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 957                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 958
 959         link->nexthop_messages--;
 960
 961         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 962                 return 1;
 963
 964         r = sd_netlink_message_get_errno(m);
 965         if (r < 0 && r != -EEXIST) {
 966                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 967                 link_enter_failed(link);
 968                 return 1;
 969         }
 970
 971         if (link->nexthop_messages == 0) {
 972                 log_link_debug(link, "Nexthop set");
 973                 link->static_nexthops_configured = true;
 974                 link_check_ready(link);
 975         }
 976
 977         return 1;
 978 }
 979
 980 static int link_request_set_nexthop(Link *link) {
 981         NextHop *nh;
 982         int r;
 983
 984         link->static_nexthops_configured = false;
 985
 986         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 987                 r = nexthop_configure(nh, link, nexthop_handler);
 988                 if (r < 0)
 989                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 990                 if (r > 0)
 991                         link->nexthop_messages++;
 992         }
 993
 994         if (link->nexthop_messages == 0) {
 995                 link->static_nexthops_configured = true;
 996                 link_check_ready(link);
 997         } else {
 998                 log_link_debug(link, "Setting nexthop");
 999                 link_set_state(link, LINK_STATE_CONFIGURING);
1000         }
1001
1002         return 1;
1003 }
1004
1005 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1006         int r;
1007
1008         assert(link);
1009         assert(link->route_messages > 0);
1010         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1011                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1012
1013         link->route_messages--;
1014
1015         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1016                 return 1;
1017
1018         r = sd_netlink_message_get_errno(m);
1019         if (r < 0 && r != -EEXIST) {
1020                 log_link_message_warning_errno(link, m, r, "Could not set route");
1021                 link_enter_failed(link);
1022                 return 1;
1023         }
1024
1025         if (link->route_messages == 0) {
1026                 log_link_debug(link, "Routes set");
1027                 link->static_routes_configured = true;
1028                 link_request_set_nexthop(link);
1029         }
1030
1031         return 1;
1032 }
1033
1034 int link_request_set_routes(Link *link) {
1035         enum {
1036                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1037                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1038                 _PHASE_MAX
1039         } phase;
1040         Route *rt;
1041         int r;
1042
1043         assert(link);
1044         assert(link->network);
1045         assert(link->addresses_configured);
1046         assert(link->address_messages == 0);
1047         assert(link->state != _LINK_STATE_INVALID);
1048
1049         link->static_routes_configured = false;
1050
1051         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1052                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1053                  * the addresses now, let's not configure the routes either. */
1054                 return 0;
1055
1056         r = link_request_set_routing_policy_rule(link);
1057         if (r < 0)
1058                 return r;
1059
1060         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1061         for (phase = 0; phase < _PHASE_MAX; phase++)
1062                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1063                         if (rt->gateway_from_dhcp)
1064                                 continue;
1065
1066                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1067                                 continue;
1068
1069                         r = route_configure(rt, link, route_handler, NULL);
1070                         if (r < 0)
1071                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1072                         if (r > 0)
1073                                 link->route_messages++;
1074                 }
1075
1076         if (link->route_messages == 0) {
1077                 link->static_routes_configured = true;
1078                 link_request_set_nexthop(link);
1079         } else {
1080                 log_link_debug(link, "Setting routes");
1081                 link_set_state(link, LINK_STATE_CONFIGURING);
1082         }
1083
1084         return 0;
1085 }
1086
1087 void link_check_ready(Link *link) {
1088         Address *a;
1089         Iterator i;
1090         int r;
1091
1092         assert(link);
1093
1094         if (link->state == LINK_STATE_CONFIGURED)
1095                 return;
1096
1097         if (link->state != LINK_STATE_CONFIGURING) {
1098                 log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
1099                 return;
1100         }
1101
1102         if (!link->network)
1103                 return;
1104
1105         if (!link->addresses_configured) {
1106                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1107                 return;
1108         }
1109
1110         if (!link->neighbors_configured) {
1111                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1112                 return;
1113         }
1114
1115         SET_FOREACH(a, link->addresses, i)
1116                 if (!address_is_ready(a)) {
1117                         _cleanup_free_ char *str = NULL;
1118
1119                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1120                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1121                         return;
1122                 }
1123
1124         if (!link->addresses_ready) {
1125                 link->addresses_ready = true;
1126                 r = link_request_set_routes(link);
1127                 if (r < 0)
1128                         link_enter_failed(link);
1129                 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1130                 return;
1131         }
1132
1133         if (!link->static_routes_configured) {
1134                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1135                 return;
1136         }
1137
1138         if (!link->static_nexthops_configured) {
1139                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1140                 return;
1141         }
1142
1143         if (!link->routing_policy_rules_configured) {
1144                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1145                 return;
1146         }
1147
1148         if (!link->tc_configured) {
1149                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1150                 return;
1151         }
1152
1153         if (!link->sr_iov_configured) {
1154                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1155                 return;
1156         }
1157
1158         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1159
1160                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address) {
1161                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1162                         return;
1163                 }
1164
1165                 if (link_ipv6ll_enabled(link) &&
1166                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1167                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1168                         return;
1169                 }
1170
1171                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && set_isempty(link->addresses)) {
1172                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no address is assigned yet.", __func__);
1173                         return;
1174                 }
1175
1176                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
1177                         if (!link->dhcp4_configured &&
1178                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1179                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1180                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1181                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address)) {
1182                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1183                                  * an IPv4ll fallback address must be configured. */
1184                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1185                                 return;
1186                         }
1187
1188                         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",
1189                                        __func__,
1190                                        yes_no(link->dhcp4_configured),
1191                                        yes_no(link->dhcp6_address_configured),
1192                                        yes_no(link->dhcp6_route_configured),
1193                                        yes_no(link->dhcp6_pd_address_configured),
1194                                        yes_no(link->dhcp6_pd_route_configured),
1195                                        yes_no(link->ndisc_addresses_configured),
1196                                        yes_no(link->ndisc_routes_configured));
1197                 }
1198         }
1199
1200         link_enter_configured(link);
1201
1202         return;
1203 }
1204
1205 static int link_request_set_neighbors(Link *link) {
1206         Neighbor *neighbor;
1207         int r;
1208
1209         assert(link);
1210         assert(link->network);
1211         assert(link->state != _LINK_STATE_INVALID);
1212
1213         link->neighbors_configured = false;
1214
1215         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1216                 r = neighbor_configure(neighbor, link, NULL);
1217                 if (r < 0)
1218                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1219         }
1220
1221         if (link->neighbor_messages == 0) {
1222                 link->neighbors_configured = true;
1223                 link_check_ready(link);
1224         } else {
1225                 log_link_debug(link, "Setting neighbors");
1226                 link_set_state(link, LINK_STATE_CONFIGURING);
1227         }
1228
1229         return 0;
1230 }
1231
1232 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1233         int r;
1234
1235         assert(rtnl);
1236         assert(m);
1237         assert(link);
1238         assert(link->ifname);
1239         assert(link->address_messages > 0);
1240         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1241                LINK_STATE_FAILED, LINK_STATE_LINGER));
1242
1243         link->address_messages--;
1244
1245         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1246                 return 1;
1247
1248         r = sd_netlink_message_get_errno(m);
1249         if (r < 0 && r != -EEXIST) {
1250                 log_link_message_warning_errno(link, m, r, "Could not set address");
1251                 link_enter_failed(link);
1252                 return 1;
1253         } else if (r >= 0)
1254                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1255
1256         if (link->address_messages == 0) {
1257                 log_link_debug(link, "Addresses set");
1258                 link->addresses_configured = true;
1259                 link_check_ready(link);
1260         }
1261
1262         return 1;
1263 }
1264
1265 static int link_set_bridge_fdb(Link *link) {
1266         FdbEntry *fdb_entry;
1267         int r;
1268
1269         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1270                 r = fdb_entry_configure(link, fdb_entry);
1271                 if (r < 0)
1272                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1273         }
1274
1275         return 0;
1276 }
1277
1278 static int link_request_set_addresses(Link *link) {
1279         AddressLabel *label;
1280         Address *ad;
1281         Prefix *p;
1282         int r;
1283
1284         assert(link);
1285         assert(link->network);
1286         assert(link->state != _LINK_STATE_INVALID);
1287
1288         /* Reset all *_configured flags we are configuring. */
1289         link->addresses_configured = false;
1290         link->addresses_ready = false;
1291         link->neighbors_configured = false;
1292         link->static_routes_configured = false;
1293         link->static_nexthops_configured = false;
1294         link->routing_policy_rules_configured = false;
1295
1296         r = link_set_bridge_fdb(link);
1297         if (r < 0)
1298                 return r;
1299
1300         r = link_request_set_neighbors(link);
1301         if (r < 0)
1302                 return r;
1303
1304         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1305                 bool update;
1306
1307                 if (ad->family == AF_INET6 && !in_addr_is_null(ad->family, &ad->in_addr_peer))
1308                         update = address_get(link, ad->family, &ad->in_addr_peer, ad->prefixlen, NULL) > 0;
1309                 else
1310                         update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1311
1312                 r = address_configure(ad, link, address_handler, update, NULL);
1313                 if (r < 0)
1314                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1315                 if (r > 0)
1316                         link->address_messages++;
1317         }
1318
1319         if (IN_SET(link->network->router_prefix_delegation,
1320                    RADV_PREFIX_DELEGATION_STATIC,
1321                    RADV_PREFIX_DELEGATION_BOTH))
1322                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1323                         _cleanup_(address_freep) Address *address = NULL;
1324
1325                         if (!p->assign)
1326                                 continue;
1327
1328                         r = address_new(&address);
1329                         if (r < 0)
1330                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1331
1332                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1333                         if (r < 0)
1334                                 return r;
1335
1336                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1337                         if (r < 0)
1338                                 return r;
1339
1340                         address->family = AF_INET6;
1341                         r = address_configure(address, link, address_handler, true, NULL);
1342                         if (r < 0)
1343                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1344                         if (r > 0)
1345                                 link->address_messages++;
1346                 }
1347
1348         LIST_FOREACH(labels, label, link->network->address_labels) {
1349                 r = address_label_configure(label, link, NULL, false);
1350                 if (r < 0)
1351                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1352
1353                 link->address_label_messages++;
1354         }
1355
1356         /* now that we can figure out a default address for the dhcp server,
1357            start it */
1358         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1359                 r = dhcp4_server_configure(link);
1360                 if (r < 0)
1361                         return r;
1362                 log_link_debug(link, "Offering DHCPv4 leases");
1363         }
1364
1365         if (link->address_messages == 0) {
1366                 link->addresses_configured = true;
1367                 link_check_ready(link);
1368         } else {
1369                 log_link_debug(link, "Setting addresses");
1370                 link_set_state(link, LINK_STATE_CONFIGURING);
1371         }
1372
1373         return 0;
1374 }
1375
1376 static int link_set_bridge_vlan(Link *link) {
1377         int r;
1378
1379         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1380         if (r < 0)
1381                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1382
1383         return r;
1384 }
1385
1386 static int link_set_proxy_arp(Link *link) {
1387         int r;
1388
1389         if (!link_proxy_arp_enabled(link))
1390                 return 0;
1391
1392         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1393         if (r < 0)
1394                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1395
1396         return 0;
1397 }
1398
1399 static int link_configure_continue(Link *link);
1400
1401 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1402         int r;
1403
1404         assert(m);
1405         assert(link);
1406         assert(link->ifname);
1407
1408         link->setting_mtu = false;
1409
1410         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1411                 return 1;
1412
1413         r = sd_netlink_message_get_errno(m);
1414         if (r < 0)
1415                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1416         else
1417                 log_link_debug(link, "Setting MTU done.");
1418
1419         if (link->state == LINK_STATE_INITIALIZED) {
1420                 r = link_configure_continue(link);
1421                 if (r < 0)
1422                         link_enter_failed(link);
1423         }
1424
1425         return 1;
1426 }
1427
1428 int link_set_mtu(Link *link, uint32_t mtu) {
1429         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1430         int r;
1431
1432         assert(link);
1433         assert(link->manager);
1434         assert(link->manager->rtnl);
1435
1436         if (mtu == 0 || link->setting_mtu)
1437                 return 0;
1438
1439         if (link->mtu == mtu)
1440                 return 0;
1441
1442         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1443
1444         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1445         if (r < 0)
1446                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1447
1448         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1449          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1450         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1451
1452                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1453                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1454
1455                 mtu = IPV6_MIN_MTU;
1456         }
1457
1458         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1459         if (r < 0)
1460                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1461
1462         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1463                                link_netlink_destroy_callback, link);
1464         if (r < 0)
1465                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1466
1467         link_ref(link);
1468         link->setting_mtu = true;
1469
1470         return 0;
1471 }
1472
1473 static bool link_reduces_vlan_mtu(Link *link) {
1474         /* See netif_reduces_vlan_mtu() in kernel. */
1475         return streq_ptr(link->kind, "macsec");
1476 }
1477
1478 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1479         uint32_t mtu = 0;
1480         NetDev *dev;
1481         Iterator i;
1482
1483         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1484                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1485                         /* See vlan_dev_change_mtu() in kernel. */
1486                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1487
1488                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1489                         /* See macvlan_change_mtu() in kernel. */
1490                         mtu = dev->mtu;
1491
1492         return mtu;
1493 }
1494
1495 static int link_configure_mtu(Link *link) {
1496         uint32_t mtu;
1497
1498         assert(link);
1499         assert(link->network);
1500
1501         if (link->network->mtu > 0)
1502                 return link_set_mtu(link, link->network->mtu);
1503
1504         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1505         if (link->mtu >= mtu)
1506                 return 0;
1507
1508         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1509                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1510                         link->mtu, mtu);
1511
1512         return link_set_mtu(link, mtu);
1513 }
1514
1515 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1516         int r;
1517
1518         assert(m);
1519         assert(link);
1520         assert(link->ifname);
1521
1522         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1523                 return 1;
1524
1525         r = sd_netlink_message_get_errno(m);
1526         if (r < 0)
1527                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1528
1529         return 1;
1530 }
1531
1532 static int link_set_flags(Link *link) {
1533         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1534         unsigned ifi_change = 0;
1535         unsigned ifi_flags = 0;
1536         int r;
1537
1538         assert(link);
1539         assert(link->manager);
1540         assert(link->manager->rtnl);
1541
1542         if (link->flags & IFF_LOOPBACK)
1543                 return 0;
1544
1545         if (!link->network)
1546                 return 0;
1547
1548         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1549                 return 0;
1550
1551         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1552         if (r < 0)
1553                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1554
1555         if (link->network->arp >= 0) {
1556                 ifi_change |= IFF_NOARP;
1557                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1558         }
1559
1560         if (link->network->multicast >= 0) {
1561                 ifi_change |= IFF_MULTICAST;
1562                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1563         }
1564
1565         if (link->network->allmulticast >= 0) {
1566                 ifi_change |= IFF_ALLMULTI;
1567                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1568         }
1569
1570         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1571         if (r < 0)
1572                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1573
1574         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1575                                link_netlink_destroy_callback, link);
1576         if (r < 0)
1577                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1578
1579         link_ref(link);
1580
1581         return 0;
1582 }
1583
1584 static int link_acquire_ipv6_conf(Link *link) {
1585         int r;
1586
1587         assert(link);
1588
1589         if (link_ipv6_accept_ra_enabled(link)) {
1590                 assert(link->ndisc);
1591
1592                 log_link_debug(link, "Discovering IPv6 routers");
1593
1594                 r = sd_ndisc_start(link->ndisc);
1595                 if (r < 0 && r != -EBUSY)
1596                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1597         }
1598
1599         if (link_radv_enabled(link)) {
1600                 assert(link->radv);
1601                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1602
1603                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1604
1605                 r = radv_emit_dns(link);
1606                 if (r < 0)
1607                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1608
1609                 r = sd_radv_start(link->radv);
1610                 if (r < 0 && r != -EBUSY)
1611                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1612         }
1613
1614         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1615                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1616                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1617                 assert(link->dhcp6_client);
1618                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1619
1620                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1621                 if (r < 0 && r != -EBUSY)
1622                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1623                 else
1624                         log_link_debug(link, "Acquiring DHCPv6 lease");
1625         }
1626
1627         (void) dhcp6_request_prefix_delegation(link);
1628
1629         return 0;
1630 }
1631
1632 static int link_acquire_ipv4_conf(Link *link) {
1633         int r;
1634
1635         assert(link);
1636         assert(link->manager);
1637         assert(link->manager->event);
1638
1639         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1640                 assert(link->ipv4ll);
1641
1642                 log_link_debug(link, "Acquiring IPv4 link-local address");
1643
1644                 r = sd_ipv4ll_start(link->ipv4ll);
1645                 if (r < 0)
1646                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1647         }
1648
1649         if (link_dhcp4_enabled(link)) {
1650                 assert(link->dhcp_client);
1651
1652                 log_link_debug(link, "Acquiring DHCPv4 lease");
1653
1654                 r = sd_dhcp_client_start(link->dhcp_client);
1655                 if (r < 0)
1656                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1657         }
1658
1659         return 0;
1660 }
1661
1662 static int link_acquire_conf(Link *link) {
1663         int r;
1664
1665         assert(link);
1666
1667         r = link_acquire_ipv4_conf(link);
1668         if (r < 0)
1669                 return r;
1670
1671         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1672                 r = link_acquire_ipv6_conf(link);
1673                 if (r < 0)
1674                         return r;
1675         }
1676
1677         if (link_lldp_emit_enabled(link)) {
1678                 r = link_lldp_emit_start(link);
1679                 if (r < 0)
1680                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1681         }
1682
1683         return 0;
1684 }
1685
1686 bool link_has_carrier(Link *link) {
1687         /* see Documentation/networking/operstates.txt in the kernel sources */
1688
1689         if (link->kernel_operstate == IF_OPER_UP)
1690                 return true;
1691
1692         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1693                 /* operstate may not be implemented, so fall back to flags */
1694                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1695                     !FLAGS_SET(link->flags, IFF_DORMANT))
1696                         return true;
1697
1698         return false;
1699 }
1700
1701 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1702         int r;
1703
1704         assert(link);
1705
1706         link->setting_genmode = false;
1707
1708         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1709                 return 1;
1710
1711         r = sd_netlink_message_get_errno(m);
1712         if (r < 0)
1713                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1714         else
1715                 log_link_debug(link, "Setting address genmode done.");
1716
1717         if (link->state == LINK_STATE_INITIALIZED) {
1718                 r = link_configure_continue(link);
1719                 if (r < 0)
1720                         link_enter_failed(link);
1721         }
1722
1723         return 1;
1724 }
1725
1726 static int link_configure_addrgen_mode(Link *link) {
1727         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1728         uint8_t ipv6ll_mode;
1729         int r;
1730
1731         assert(link);
1732         assert(link->network);
1733         assert(link->manager);
1734         assert(link->manager->rtnl);
1735
1736         if (!socket_ipv6_is_supported() || link->setting_genmode)
1737                 return 0;
1738
1739         log_link_debug(link, "Setting address genmode for link");
1740
1741         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1742         if (r < 0)
1743                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1744
1745         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1746         if (r < 0)
1747                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1748
1749         r = sd_netlink_message_open_container(req, AF_INET6);
1750         if (r < 0)
1751                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1752
1753         if (!link_ipv6ll_enabled(link))
1754                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1755         else if (link->network->ipv6ll_address_gen_mode < 0) {
1756                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1757                 if (r < 0) {
1758                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1759                          * reading the file fails with EIO. */
1760                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1761
1762                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1763                 } else
1764                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1765         } else
1766                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1767
1768         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1769         if (r < 0)
1770                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1771
1772         r = sd_netlink_message_close_container(req);
1773         if (r < 0)
1774                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1775
1776         r = sd_netlink_message_close_container(req);
1777         if (r < 0)
1778                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1779
1780         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1781                                link_netlink_destroy_callback, link);
1782         if (r < 0)
1783                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1784
1785         link_ref(link);
1786         link->setting_genmode = true;
1787
1788         return 0;
1789 }
1790
1791 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1792         int r;
1793
1794         assert(link);
1795
1796         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1797                 return 1;
1798
1799         r = sd_netlink_message_get_errno(m);
1800         if (r < 0)
1801                 /* we warn but don't fail the link, as it may be brought up later */
1802                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1803
1804         return 1;
1805 }
1806
1807 static int link_up(Link *link) {
1808         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1809         int r;
1810
1811         assert(link);
1812         assert(link->network);
1813         assert(link->manager);
1814         assert(link->manager->rtnl);
1815
1816         log_link_debug(link, "Bringing link up");
1817
1818         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1819         if (r < 0)
1820                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1821
1822         /* set it free if not enslaved with networkd */
1823         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1824                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1825                 if (r < 0)
1826                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1827         }
1828
1829         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1830         if (r < 0)
1831                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1832
1833         if (link->network->mac) {
1834                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1835                 if (r < 0)
1836                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1837         }
1838
1839         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1840                                link_netlink_destroy_callback, link);
1841         if (r < 0)
1842                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1843
1844         link_ref(link);
1845
1846         return 0;
1847 }
1848
1849 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1850         int r;
1851
1852         assert(link);
1853
1854         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1855                 return 1;
1856
1857         r = sd_netlink_message_get_errno(m);
1858         if (r < 0)
1859                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1860
1861         return 1;
1862 }
1863
1864 int link_down(Link *link, link_netlink_message_handler_t callback) {
1865         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1866         int r;
1867
1868         assert(link);
1869         assert(link->manager);
1870         assert(link->manager->rtnl);
1871
1872         log_link_debug(link, "Bringing link down");
1873
1874         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1875                                      RTM_SETLINK, link->ifindex);
1876         if (r < 0)
1877                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1878
1879         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1880         if (r < 0)
1881                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1882
1883         r = netlink_call_async(link->manager->rtnl, NULL, req,
1884                                callback ?: link_down_handler,
1885                                link_netlink_destroy_callback, link);
1886         if (r < 0)
1887                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1888
1889         link_ref(link);
1890
1891         return 0;
1892 }
1893
1894 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1895         int r;
1896
1897         assert(link);
1898
1899         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1900                 return 1;
1901
1902         r = sd_netlink_message_get_errno(m);
1903         if (r < 0)
1904                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1905
1906         return 1;
1907 }
1908
1909 static int link_set_group(Link *link) {
1910         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1911         int r;
1912
1913         assert(link);
1914         assert(link->network);
1915         assert(link->manager);
1916         assert(link->manager->rtnl);
1917
1918         if (link->network->group <= 0)
1919                 return 0;
1920
1921         log_link_debug(link, "Setting group");
1922
1923         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1924         if (r < 0)
1925                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1926
1927         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1928         if (r < 0)
1929                 return log_link_error_errno(link, r, "Could not set link group: %m");
1930
1931         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1932                                link_netlink_destroy_callback, link);
1933         if (r < 0)
1934                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1935
1936         link_ref(link);
1937
1938         return 0;
1939 }
1940
1941 static int link_handle_bound_to_list(Link *link) {
1942         Link *l;
1943         Iterator i;
1944         int r;
1945         bool required_up = false;
1946         bool link_is_up = false;
1947
1948         assert(link);
1949
1950         if (hashmap_isempty(link->bound_to_links))
1951                 return 0;
1952
1953         if (link->flags & IFF_UP)
1954                 link_is_up = true;
1955
1956         HASHMAP_FOREACH (l, link->bound_to_links, i)
1957                 if (link_has_carrier(l)) {
1958                         required_up = true;
1959                         break;
1960                 }
1961
1962         if (!required_up && link_is_up) {
1963                 r = link_down(link, NULL);
1964                 if (r < 0)
1965                         return r;
1966         } else if (required_up && !link_is_up) {
1967                 r = link_up(link);
1968                 if (r < 0)
1969                         return r;
1970         }
1971
1972         return 0;
1973 }
1974
1975 static int link_handle_bound_by_list(Link *link) {
1976         Iterator i;
1977         Link *l;
1978         int r;
1979
1980         assert(link);
1981
1982         if (hashmap_isempty(link->bound_by_links))
1983                 return 0;
1984
1985         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1986                 r = link_handle_bound_to_list(l);
1987                 if (r < 0)
1988                         return r;
1989         }
1990
1991         return 0;
1992 }
1993
1994 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1995         int r;
1996
1997         assert(link);
1998         assert(carrier);
1999
2000         if (link == carrier)
2001                 return 0;
2002
2003         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2004                 return 0;
2005
2006         r = hashmap_ensure_allocated(h, NULL);
2007         if (r < 0)
2008                 return r;
2009
2010         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2011         if (r < 0)
2012                 return r;
2013
2014         return 0;
2015 }
2016
2017 static int link_new_bound_by_list(Link *link) {
2018         Manager *m;
2019         Link *carrier;
2020         Iterator i;
2021         int r;
2022         bool list_updated = false;
2023
2024         assert(link);
2025         assert(link->manager);
2026
2027         m = link->manager;
2028
2029         HASHMAP_FOREACH(carrier, m->links, i) {
2030                 if (!carrier->network)
2031                         continue;
2032
2033                 if (strv_isempty(carrier->network->bind_carrier))
2034                         continue;
2035
2036                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2037                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2038                         if (r < 0)
2039                                 return r;
2040
2041                         list_updated = true;
2042                 }
2043         }
2044
2045         if (list_updated)
2046                 link_dirty(link);
2047
2048         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2049                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2050                 if (r < 0)
2051                         return r;
2052
2053                 link_dirty(carrier);
2054         }
2055
2056         return 0;
2057 }
2058
2059 static int link_new_bound_to_list(Link *link) {
2060         Manager *m;
2061         Link *carrier;
2062         Iterator i;
2063         int r;
2064         bool list_updated = false;
2065
2066         assert(link);
2067         assert(link->manager);
2068
2069         if (!link->network)
2070                 return 0;
2071
2072         if (strv_isempty(link->network->bind_carrier))
2073                 return 0;
2074
2075         m = link->manager;
2076
2077         HASHMAP_FOREACH (carrier, m->links, i) {
2078                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2079                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2080                         if (r < 0)
2081                                 return r;
2082
2083                         list_updated = true;
2084                 }
2085         }
2086
2087         if (list_updated)
2088                 link_dirty(link);
2089
2090         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2091                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2092                 if (r < 0)
2093                         return r;
2094
2095                 link_dirty(carrier);
2096         }
2097
2098         return 0;
2099 }
2100
2101 static int link_new_carrier_maps(Link *link) {
2102         int r;
2103
2104         r = link_new_bound_by_list(link);
2105         if (r < 0)
2106                 return r;
2107
2108         r = link_handle_bound_by_list(link);
2109         if (r < 0)
2110                 return r;
2111
2112         r = link_new_bound_to_list(link);
2113         if (r < 0)
2114                 return r;
2115
2116         r = link_handle_bound_to_list(link);
2117         if (r < 0)
2118                 return r;
2119
2120         return 0;
2121 }
2122
2123 static void link_free_bound_to_list(Link *link) {
2124         Link *bound_to;
2125         Iterator i;
2126
2127         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2128                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2129
2130                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2131                         link_dirty(bound_to);
2132         }
2133
2134         return;
2135 }
2136
2137 static void link_free_bound_by_list(Link *link) {
2138         Link *bound_by;
2139         Iterator i;
2140
2141         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2142                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2143
2144                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2145                         link_dirty(bound_by);
2146                         link_handle_bound_to_list(bound_by);
2147                 }
2148         }
2149
2150         return;
2151 }
2152
2153 static void link_free_carrier_maps(Link *link) {
2154         bool list_updated = false;
2155
2156         assert(link);
2157
2158         if (!hashmap_isempty(link->bound_to_links)) {
2159                 link_free_bound_to_list(link);
2160                 list_updated = true;
2161         }
2162
2163         if (!hashmap_isempty(link->bound_by_links)) {
2164                 link_free_bound_by_list(link);
2165                 list_updated = true;
2166         }
2167
2168         if (list_updated)
2169                 link_dirty(link);
2170
2171         return;
2172 }
2173
2174 static int link_append_to_master(Link *link, NetDev *netdev) {
2175         Link *master;
2176         int r;
2177
2178         assert(link);
2179         assert(netdev);
2180
2181         r = link_get(link->manager, netdev->ifindex, &master);
2182         if (r < 0)
2183                 return r;
2184
2185         r = set_ensure_put(&master->slaves, NULL, link);
2186         if (r <= 0)
2187                 return r;
2188
2189         link_ref(link);
2190         return 0;
2191 }
2192
2193 static void link_drop_from_master(Link *link, NetDev *netdev) {
2194         Link *master;
2195
2196         assert(link);
2197
2198         if (!link->manager || !netdev)
2199                 return;
2200
2201         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2202                 return;
2203
2204         link_unref(set_remove(master->slaves, link));
2205 }
2206
2207 static void link_detach_from_manager(Link *link) {
2208         if (!link || !link->manager)
2209                 return;
2210
2211         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2212         link_clean(link);
2213
2214         /* The following must be called at last. */
2215         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2216         link_unref(link);
2217 }
2218
2219 void link_drop(Link *link) {
2220         if (!link || link->state == LINK_STATE_LINGER)
2221                 return;
2222
2223         link_set_state(link, LINK_STATE_LINGER);
2224
2225         link_free_carrier_maps(link);
2226
2227         if (link->network) {
2228                 link_drop_from_master(link, link->network->bridge);
2229                 link_drop_from_master(link, link->network->bond);
2230         }
2231
2232         log_link_debug(link, "Link removed");
2233
2234         (void) unlink(link->state_file);
2235         link_detach_from_manager(link);
2236 }
2237
2238 static int link_joined(Link *link) {
2239         int r;
2240
2241         assert(link);
2242         assert(link->network);
2243
2244         if (!hashmap_isempty(link->bound_to_links)) {
2245                 r = link_handle_bound_to_list(link);
2246                 if (r < 0)
2247                         return r;
2248         } else if (!(link->flags & IFF_UP)) {
2249                 r = link_up(link);
2250                 if (r < 0) {
2251                         link_enter_failed(link);
2252                         return r;
2253                 }
2254         }
2255
2256         if (link->network->bridge) {
2257                 r = link_set_bridge(link);
2258                 if (r < 0)
2259                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2260
2261                 r = link_append_to_master(link, link->network->bridge);
2262                 if (r < 0)
2263                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2264         }
2265
2266         if (link->network->bond) {
2267                 r = link_set_bond(link);
2268                 if (r < 0)
2269                         log_link_error_errno(link, r, "Could not set bond message: %m");
2270
2271                 r = link_append_to_master(link, link->network->bond);
2272                 if (r < 0)
2273                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2274         }
2275
2276         if (link->network->use_br_vlan &&
2277             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2278                 r = link_set_bridge_vlan(link);
2279                 if (r < 0)
2280                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2281         }
2282
2283         /* Skip setting up addresses until it gets carrier,
2284            or it would try to set addresses twice,
2285            which is bad for non-idempotent steps. */
2286         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2287                 return 0;
2288
2289         link_set_state(link, LINK_STATE_CONFIGURING);
2290         return link_request_set_addresses(link);
2291 }
2292
2293 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2294         int r;
2295
2296         assert(link);
2297         assert(link->network);
2298         assert(link->enslaving > 0);
2299
2300         link->enslaving--;
2301
2302         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2303                 return 1;
2304
2305         r = sd_netlink_message_get_errno(m);
2306         if (r < 0 && r != -EEXIST) {
2307                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2308                 link_enter_failed(link);
2309                 return 1;
2310         }
2311
2312         log_link_debug(link, "Joined netdev");
2313
2314         if (link->enslaving == 0) {
2315                 r = link_joined(link);
2316                 if (r < 0)
2317                         link_enter_failed(link);
2318         }
2319
2320         return 1;
2321 }
2322
2323 static int link_enter_join_netdev(Link *link) {
2324         NetDev *netdev;
2325         Iterator i;
2326         int r;
2327
2328         assert(link);
2329         assert(link->network);
2330         assert(link->state == LINK_STATE_INITIALIZED);
2331
2332         link_set_state(link, LINK_STATE_CONFIGURING);
2333
2334         link_dirty(link);
2335         link->enslaving = 0;
2336
2337         if (link->network->bond) {
2338                 if (link->network->bond->state == NETDEV_STATE_READY &&
2339                     link->network->bond->ifindex == link->master_ifindex)
2340                         return link_joined(link);
2341
2342                 log_struct(LOG_DEBUG,
2343                            LOG_LINK_INTERFACE(link),
2344                            LOG_NETDEV_INTERFACE(link->network->bond),
2345                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2346
2347                 link->enslaving++;
2348
2349                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2350                 if (r < 0) {
2351                         log_struct_errno(LOG_WARNING, r,
2352                                          LOG_LINK_INTERFACE(link),
2353                                          LOG_NETDEV_INTERFACE(link->network->bond),
2354                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2355                         link_enter_failed(link);
2356                         return r;
2357                 }
2358         }
2359
2360         if (link->network->bridge) {
2361                 log_struct(LOG_DEBUG,
2362                            LOG_LINK_INTERFACE(link),
2363                            LOG_NETDEV_INTERFACE(link->network->bridge),
2364                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2365
2366                 link->enslaving++;
2367
2368                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2369                 if (r < 0) {
2370                         log_struct_errno(LOG_WARNING, r,
2371                                          LOG_LINK_INTERFACE(link),
2372                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2373                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2374                         link_enter_failed(link);
2375                         return r;
2376                 }
2377         }
2378
2379         if (link->network->vrf) {
2380                 log_struct(LOG_DEBUG,
2381                            LOG_LINK_INTERFACE(link),
2382                            LOG_NETDEV_INTERFACE(link->network->vrf),
2383                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2384
2385                 link->enslaving++;
2386
2387                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2388                 if (r < 0) {
2389                         log_struct_errno(LOG_WARNING, r,
2390                                          LOG_LINK_INTERFACE(link),
2391                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2392                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2393                         link_enter_failed(link);
2394                         return r;
2395                 }
2396         }
2397
2398         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2399
2400                 if (netdev->ifindex > 0)
2401                         /* Assume already enslaved. */
2402                         continue;
2403
2404                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2405                         continue;
2406
2407                 log_struct(LOG_DEBUG,
2408                            LOG_LINK_INTERFACE(link),
2409                            LOG_NETDEV_INTERFACE(netdev),
2410                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2411
2412                 link->enslaving++;
2413
2414                 r = netdev_join(netdev, link, netdev_join_handler);
2415                 if (r < 0) {
2416                         log_struct_errno(LOG_WARNING, r,
2417                                          LOG_LINK_INTERFACE(link),
2418                                          LOG_NETDEV_INTERFACE(netdev),
2419                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2420                         link_enter_failed(link);
2421                         return r;
2422                 }
2423         }
2424
2425         if (link->enslaving == 0)
2426                 return link_joined(link);
2427
2428         return 0;
2429 }
2430
2431 static int link_set_ipv4_forward(Link *link) {
2432         int r;
2433
2434         if (!link_ipv4_forward_enabled(link))
2435                 return 0;
2436
2437         /* We propagate the forwarding flag from one interface to the
2438          * global setting one way. This means: as long as at least one
2439          * interface was configured at any time that had IP forwarding
2440          * enabled the setting will stay on for good. We do this
2441          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2442          * somewhat in sync (see below). */
2443
2444         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2445         if (r < 0)
2446                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2447
2448         return 0;
2449 }
2450
2451 static int link_set_ipv6_forward(Link *link) {
2452         int r;
2453
2454         if (!link_ipv6_forward_enabled(link))
2455                 return 0;
2456
2457         /* On Linux, the IPv6 stack does not know a per-interface
2458          * packet forwarding setting: either packet forwarding is on
2459          * for all, or off for all. We hence don't bother with a
2460          * per-interface setting, but simply propagate the interface
2461          * flag, if it is set, to the global flag, one-way. Note that
2462          * while IPv4 would allow a per-interface flag, we expose the
2463          * same behaviour there and also propagate the setting from
2464          * one to all, to keep things simple (see above). */
2465
2466         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2467         if (r < 0)
2468                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2469
2470         return 0;
2471 }
2472
2473 static int link_set_ipv6_privacy_extensions(Link *link) {
2474         IPv6PrivacyExtensions s;
2475         int r;
2476
2477         s = link_ipv6_privacy_extensions(link);
2478         if (s < 0)
2479                 return 0;
2480
2481         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2482         if (r < 0)
2483                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2484
2485         return 0;
2486 }
2487
2488 static int link_set_ipv6_accept_ra(Link *link) {
2489         int r;
2490
2491         /* Make this a NOP if IPv6 is not available */
2492         if (!socket_ipv6_is_supported())
2493                 return 0;
2494
2495         if (link->flags & IFF_LOOPBACK)
2496                 return 0;
2497
2498         if (!link->network)
2499                 return 0;
2500
2501         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2502         if (r < 0)
2503                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2504
2505         return 0;
2506 }
2507
2508 static int link_set_ipv6_dad_transmits(Link *link) {
2509         int r;
2510
2511         /* Make this a NOP if IPv6 is not available */
2512         if (!socket_ipv6_is_supported())
2513                 return 0;
2514
2515         if (link->flags & IFF_LOOPBACK)
2516                 return 0;
2517
2518         if (!link->network)
2519                 return 0;
2520
2521         if (link->network->ipv6_dad_transmits < 0)
2522                 return 0;
2523
2524         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2525         if (r < 0)
2526                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2527
2528         return 0;
2529 }
2530
2531 static int link_set_ipv6_hop_limit(Link *link) {
2532         int r;
2533
2534         /* Make this a NOP if IPv6 is not available */
2535         if (!socket_ipv6_is_supported())
2536                 return 0;
2537
2538         if (link->flags & IFF_LOOPBACK)
2539                 return 0;
2540
2541         if (!link->network)
2542                 return 0;
2543
2544         if (link->network->ipv6_hop_limit < 0)
2545                 return 0;
2546
2547         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2548         if (r < 0)
2549                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2550
2551         return 0;
2552 }
2553
2554 static int link_set_ipv6_mtu(Link *link) {
2555         int r;
2556
2557         /* Make this a NOP if IPv6 is not available */
2558         if (!socket_ipv6_is_supported())
2559                 return 0;
2560
2561         if (link->flags & IFF_LOOPBACK)
2562                 return 0;
2563
2564         if (link->network->ipv6_mtu == 0)
2565                 return 0;
2566
2567         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2568          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2569         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2570                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2571                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2572         }
2573
2574         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2575         if (r < 0) {
2576                 if (link->mtu < link->network->ipv6_mtu)
2577                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2578                                          link->network->ipv6_mtu, link->mtu);
2579                 else
2580                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2581         }
2582
2583         link->ipv6_mtu_set = true;
2584
2585         return 0;
2586 }
2587
2588 static int link_set_ipv4_accept_local(Link *link) {
2589         int r;
2590
2591         if (link->flags & IFF_LOOPBACK)
2592                 return 0;
2593
2594         if (link->network->ipv4_accept_local < 0)
2595                 return 0;
2596
2597         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2598         if (r < 0)
2599                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2600
2601         return 0;
2602 }
2603
2604 static bool link_is_static_address_configured(Link *link, Address *address) {
2605         Address *net_address;
2606
2607         assert(link);
2608         assert(address);
2609
2610         if (!link->network)
2611                 return false;
2612
2613         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2614                 if (address_equal(net_address, address))
2615                         return true;
2616                 else if (address->family == AF_INET6 && net_address->family == AF_INET6 &&
2617                          in_addr_equal(AF_INET6, &address->in_addr, &net_address->in_addr_peer) > 0)
2618                         return true;
2619
2620         return false;
2621 }
2622
2623 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2624         Neighbor *net_neighbor;
2625
2626         assert(link);
2627         assert(neighbor);
2628
2629         if (!link->network)
2630                 return false;
2631
2632         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2633                 if (neighbor_equal(net_neighbor, neighbor))
2634                         return true;
2635
2636         return false;
2637 }
2638
2639 static bool link_is_static_route_configured(Link *link, Route *route) {
2640         Route *net_route;
2641
2642         assert(link);
2643         assert(route);
2644
2645         if (!link->network)
2646                 return false;
2647
2648         LIST_FOREACH(routes, net_route, link->network->static_routes)
2649                 if (route_equal(net_route, route))
2650                         return true;
2651
2652         return false;
2653 }
2654
2655 static bool link_address_is_dynamic(Link *link, Address *address) {
2656         Route *route;
2657         Iterator i;
2658
2659         assert(link);
2660         assert(address);
2661
2662         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2663                 return true;
2664
2665         /* Even when the address is leased from a DHCP server, networkd assign the address
2666          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2667          * corresponding routes with RTPROT_DHCP. */
2668         SET_FOREACH(route, link->routes_foreign, i) {
2669                 if (route->protocol != RTPROT_DHCP)
2670                         continue;
2671
2672                 if (address->family != route->family)
2673                         continue;
2674
2675                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2676                         return true;
2677         }
2678
2679         return false;
2680 }
2681
2682 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2683         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2684         sd_netlink_message *addr;
2685         int r;
2686
2687         assert(link);
2688         assert(link->manager);
2689         assert(link->manager->rtnl);
2690
2691         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2692         if (r < 0)
2693                 return r;
2694
2695         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2696         if (r < 0)
2697                 return r;
2698
2699         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2700                 unsigned char flags;
2701                 int ifindex;
2702
2703                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2704                 if (r < 0) {
2705                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2706                         continue;
2707                 } else if (link->ifindex != ifindex)
2708                         continue;
2709
2710                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2711                 if (r < 0) {
2712                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2713                         continue;
2714                 } else if (!(flags & IFA_F_TENTATIVE))
2715                         continue;
2716
2717                 log_link_debug(link, "Found tentative ipv6 link-local address");
2718                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2719         }
2720
2721         return 0;
2722 }
2723
2724 static int link_drop_foreign_config(Link *link) {
2725         Address *address;
2726         Neighbor *neighbor;
2727         Route *route;
2728         Iterator i;
2729         int r;
2730
2731         /* The kernel doesn't notify us about tentative addresses;
2732          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2733         if (!link_ipv6ll_enabled(link)) {
2734                 r = link_enumerate_ipv6_tentative_addresses(link);
2735                 if (r < 0)
2736                         return r;
2737         }
2738
2739         SET_FOREACH(address, link->addresses_foreign, i) {
2740                 /* we consider IPv6LL addresses to be managed by the kernel */
2741                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2742                         continue;
2743
2744                 if (link_address_is_dynamic(link, address)) {
2745                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2746                                 continue;
2747                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2748                         continue;
2749
2750                 if (link_is_static_address_configured(link, address)) {
2751                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2752                         if (r < 0)
2753                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2754                 } else {
2755                         r = address_remove(address, link, NULL);
2756                         if (r < 0)
2757                                 return r;
2758                 }
2759         }
2760
2761         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2762                 if (link_is_neighbor_configured(link, neighbor)) {
2763                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2764                         if (r < 0)
2765                                 return r;
2766                 } else {
2767                         r = neighbor_remove(neighbor, link, NULL);
2768                         if (r < 0)
2769                                 return r;
2770                 }
2771         }
2772
2773         SET_FOREACH(route, link->routes_foreign, i) {
2774                 /* do not touch routes managed by the kernel */
2775                 if (route->protocol == RTPROT_KERNEL)
2776                         continue;
2777
2778                 /* do not touch multicast route added by kernel */
2779                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2780                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2781                 if (route->protocol == RTPROT_BOOT &&
2782                     route->family == AF_INET6 &&
2783                     route->dst_prefixlen == 8 &&
2784                     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 }}} }))
2785                         continue;
2786
2787                 if (route->protocol == RTPROT_STATIC && link->network &&
2788                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2789                         continue;
2790
2791                 if (route->protocol == RTPROT_DHCP && link->network &&
2792                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2793                         continue;
2794
2795                 if (link_is_static_route_configured(link, route)) {
2796                         r = route_add(link, route, NULL);
2797                         if (r < 0)
2798                                 return r;
2799                 } else {
2800                         r = route_remove(route, link, NULL);
2801                         if (r < 0)
2802                                 return r;
2803                 }
2804         }
2805
2806         return 0;
2807 }
2808
2809 static int link_drop_config(Link *link) {
2810         Address *address, *pool_address;
2811         Neighbor *neighbor;
2812         Route *route;
2813         Iterator i;
2814         int r;
2815
2816         SET_FOREACH(address, link->addresses, i) {
2817                 /* we consider IPv6LL addresses to be managed by the kernel */
2818                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2819                         continue;
2820
2821                 r = address_remove(address, link, NULL);
2822                 if (r < 0)
2823                         return r;
2824
2825                 /* If this address came from an address pool, clean up the pool */
2826                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2827                         if (address_equal(address, pool_address)) {
2828                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2829                                 address_free(pool_address);
2830                                 break;
2831                         }
2832                 }
2833         }
2834
2835         SET_FOREACH(neighbor, link->neighbors, i) {
2836                 r = neighbor_remove(neighbor, link, NULL);
2837                 if (r < 0)
2838                         return r;
2839         }
2840
2841         SET_FOREACH(route, link->routes, i) {
2842                 /* do not touch routes managed by the kernel */
2843                 if (route->protocol == RTPROT_KERNEL)
2844                         continue;
2845
2846                 r = route_remove(route, link, NULL);
2847                 if (r < 0)
2848                         return r;
2849         }
2850
2851         ndisc_flush(link);
2852
2853         return 0;
2854 }
2855
2856 static int link_configure_ipv4_dad(Link *link) {
2857         Address *address;
2858         int r;
2859
2860         assert(link);
2861         assert(link->network);
2862
2863         LIST_FOREACH(addresses, address, link->network->static_addresses)
2864                 if (address->family == AF_INET &&
2865                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2866                         r = configure_ipv4_duplicate_address_detection(link, address);
2867                         if (r < 0)
2868                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2869                 }
2870
2871         return 0;
2872 }
2873
2874 static int link_configure_traffic_control(Link *link) {
2875         TrafficControl *tc;
2876         Iterator i;
2877         int r;
2878
2879         link->tc_configured = false;
2880         link->tc_messages = 0;
2881
2882         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2883                 r = traffic_control_configure(link, tc);
2884                 if (r < 0)
2885                         return r;
2886         }
2887
2888         if (link->tc_messages == 0)
2889                 link->tc_configured = true;
2890         else
2891                 log_link_debug(link, "Configuring traffic control");
2892
2893         return 0;
2894 }
2895
2896 static int link_configure_sr_iov(Link *link) {
2897         SRIOV *sr_iov;
2898         Iterator i;
2899         int r;
2900
2901         link->sr_iov_configured = false;
2902         link->sr_iov_messages = 0;
2903
2904         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2905                 r = sr_iov_configure(link, sr_iov);
2906                 if (r < 0)
2907                         return r;
2908         }
2909
2910         if (link->sr_iov_messages == 0)
2911                 link->sr_iov_configured = true;
2912         else
2913                 log_link_debug(link, "Configuring SR-IOV");
2914
2915         return 0;
2916 }
2917
2918 static int link_configure(Link *link) {
2919         int r;
2920
2921         assert(link);
2922         assert(link->network);
2923         assert(link->state == LINK_STATE_INITIALIZED);
2924
2925         r = link_configure_traffic_control(link);
2926         if (r < 0)
2927                 return r;
2928
2929         r = link_configure_sr_iov(link);
2930         if (r < 0)
2931                 return r;
2932
2933         if (link->iftype == ARPHRD_CAN)
2934                 return link_configure_can(link);
2935
2936         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2937          * for this interface, then enable IPv6 */
2938         (void) link_update_ipv6_sysctl(link);
2939
2940         r = link_set_proxy_arp(link);
2941         if (r < 0)
2942                return r;
2943
2944         r = ipv6_proxy_ndp_addresses_configure(link);
2945         if (r < 0)
2946                 return r;
2947
2948         r = link_set_ipv4_forward(link);
2949         if (r < 0)
2950                 return r;
2951
2952         r = link_set_ipv6_forward(link);
2953         if (r < 0)
2954                 return r;
2955
2956         r = link_set_ipv6_privacy_extensions(link);
2957         if (r < 0)
2958                 return r;
2959
2960         r = link_set_ipv6_accept_ra(link);
2961         if (r < 0)
2962                 return r;
2963
2964         r = link_set_ipv6_dad_transmits(link);
2965         if (r < 0)
2966                 return r;
2967
2968         r = link_set_ipv6_hop_limit(link);
2969         if (r < 0)
2970                 return r;
2971
2972         r = link_set_ipv4_accept_local(link);
2973         if (r < 0)
2974                 return r;
2975
2976         r = link_set_flags(link);
2977         if (r < 0)
2978                 return r;
2979
2980         r = link_set_group(link);
2981         if (r < 0)
2982                 return r;
2983
2984         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2985                 r = ipv4ll_configure(link);
2986                 if (r < 0)
2987                         return r;
2988         }
2989
2990         if (link_dhcp4_enabled(link)) {
2991                 r = dhcp4_set_promote_secondaries(link);
2992                 if (r < 0)
2993                         return r;
2994
2995                 r = dhcp4_configure(link);
2996                 if (r < 0)
2997                         return r;
2998         }
2999
3000         if (link_dhcp4_server_enabled(link)) {
3001                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3002                 if (r < 0)
3003                         return r;
3004
3005                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3006                 if (r < 0)
3007                         return r;
3008         }
3009
3010         if (link_dhcp6_enabled(link) ||
3011             link_ipv6_accept_ra_enabled(link)) {
3012                 r = dhcp6_configure(link);
3013                 if (r < 0)
3014                         return r;
3015         }
3016
3017         if (link_ipv6_accept_ra_enabled(link)) {
3018                 r = ndisc_configure(link);
3019                 if (r < 0)
3020                         return r;
3021         }
3022
3023         if (link_radv_enabled(link)) {
3024                 r = radv_configure(link);
3025                 if (r < 0)
3026                         return r;
3027         }
3028
3029         if (link_lldp_rx_enabled(link)) {
3030                 r = link_lldp_rx_configure(link);
3031                 if (r < 0)
3032                         return r;
3033         }
3034
3035         r = link_configure_mtu(link);
3036         if (r < 0)
3037                 return r;
3038
3039         r = link_configure_addrgen_mode(link);
3040         if (r < 0)
3041                 return r;
3042
3043         r = link_configure_ipv4_dad(link);
3044         if (r < 0)
3045                 return r;
3046
3047         return link_configure_continue(link);
3048 }
3049
3050 /* The configuration continues in this separate function, instead of
3051  * including this in the above link_configure() function, for two
3052  * reasons:
3053  * 1) some devices reset the link when the mtu is set, which caused
3054  *    an infinite loop here in networkd; see:
3055  *    https://github.com/systemd/systemd/issues/6593
3056  *    https://github.com/systemd/systemd/issues/9831
3057  * 2) if ipv6ll is disabled, then bringing the interface up must be
3058  *    delayed until after we get confirmation from the kernel that
3059  *    the addr_gen_mode parameter has been set (via netlink), see:
3060  *    https://github.com/systemd/systemd/issues/13882
3061  */
3062 static int link_configure_continue(Link *link) {
3063         int r;
3064
3065         assert(link);
3066         assert(link->network);
3067         assert(link->state == LINK_STATE_INITIALIZED);
3068
3069         if (link->setting_mtu || link->setting_genmode)
3070                 return 0;
3071
3072         /* Drop foreign config, but ignore loopback or critical devices.
3073          * We do not want to remove loopback address or addresses used for root NFS. */
3074         if (!(link->flags & IFF_LOOPBACK) &&
3075             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3076                 r = link_drop_foreign_config(link);
3077                 if (r < 0)
3078                         return r;
3079         }
3080
3081         /* The kernel resets ipv6 mtu after changing device mtu;
3082          * we must set this here, after we've set device mtu */
3083         r = link_set_ipv6_mtu(link);
3084         if (r < 0)
3085                 return r;
3086
3087         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3088                 r = link_acquire_conf(link);
3089                 if (r < 0)
3090                         return r;
3091         }
3092
3093         return link_enter_join_netdev(link);
3094 }
3095
3096 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3097         assert(duid);
3098
3099         if (duid->raw_data_len > 0)
3100                 return 0;
3101
3102         if (duid->type != DUID_TYPE_UUID)
3103                 return -EINVAL;
3104
3105         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3106         duid->raw_data_len = sizeof(sd_id128_t);
3107
3108         return 1;
3109 }
3110
3111 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3112         Manager *manager = userdata;
3113         const sd_bus_error *e;
3114         const void *a;
3115         size_t sz;
3116         DUID *duid;
3117         Link *link;
3118         int r;
3119
3120         assert(m);
3121         assert(manager);
3122
3123         e = sd_bus_message_get_error(m);
3124         if (e) {
3125                 log_error_errno(sd_bus_error_get_errno(e),
3126                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3127                                 e->message);
3128                 goto configure;
3129         }
3130
3131         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3132         if (r < 0)
3133                 goto configure;
3134
3135         if (sz != sizeof(sd_id128_t)) {
3136                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3137                 goto configure;
3138         }
3139
3140         memcpy(&manager->product_uuid, a, sz);
3141         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3142                 (void) duid_set_uuid(duid, manager->product_uuid);
3143
3144         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3145
3146 configure:
3147         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3148                 link_unref(link);
3149
3150                 r = link_configure(link);
3151                 if (r < 0)
3152                         link_enter_failed(link);
3153         }
3154
3155         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3156
3157         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3158          * even if the method fails. */
3159         manager->has_product_uuid = true;
3160
3161         return 1;
3162 }
3163
3164 static bool link_requires_uuid(Link *link) {
3165         const DUID *duid;
3166
3167         assert(link);
3168         assert(link->manager);
3169         assert(link->network);
3170
3171         duid = link_get_duid(link);
3172         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3173                 return false;
3174
3175         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3176                 return true;
3177
3178         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3179                 return true;
3180
3181         return false;
3182 }
3183
3184 static int link_configure_duid(Link *link) {
3185         Manager *m;
3186         DUID *duid;
3187         int r;
3188
3189         assert(link);
3190         assert(link->manager);
3191         assert(link->network);
3192
3193         m = link->manager;
3194         duid = link_get_duid(link);
3195
3196         if (!link_requires_uuid(link))
3197                 return 1;
3198
3199         if (m->has_product_uuid) {
3200                 (void) duid_set_uuid(duid, m->product_uuid);
3201                 return 1;
3202         }
3203
3204         if (!m->links_requesting_uuid) {
3205                 r = manager_request_product_uuid(m, link);
3206                 if (r < 0) {
3207                         if (r == -ENOMEM)
3208                                 return r;
3209
3210                         log_link_warning_errno(link, r,
3211                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3212                         return 1;
3213                 }
3214         } else {
3215                 r = set_put(m->links_requesting_uuid, link);
3216                 if (r < 0)
3217                         return log_oom();
3218                 if (r > 0)
3219                         link_ref(link);
3220
3221                 r = set_put(m->duids_requesting_uuid, duid);
3222                 if (r < 0)
3223                         return log_oom();
3224         }
3225
3226         return 0;
3227 }
3228
3229 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3230         Network *network;
3231         int r;
3232
3233         if (m) {
3234                 _cleanup_strv_free_ char **s = NULL;
3235
3236                 r = sd_netlink_message_get_errno(m);
3237                 if (r < 0)
3238                         return r;
3239
3240                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3241                 if (r < 0 && r != -ENODATA)
3242                         return r;
3243
3244                 strv_free_and_replace(link->alternative_names, s);
3245         }
3246
3247         r = network_get(link->manager, link->iftype, link->sd_device,
3248                         link->ifname, link->alternative_names, link->driver,
3249                         &link->mac, &link->permanent_mac,
3250                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3251         if (r == -ENOENT) {
3252                 link_enter_unmanaged(link);
3253                 return 0;
3254         } else if (r == 0 && network->unmanaged) {
3255                 link_enter_unmanaged(link);
3256                 return 0;
3257         } else if (r < 0)
3258                 return r;
3259
3260         if (link->network == network && !force)
3261                 return 0;
3262
3263         log_link_info(link, "Re-configuring with %s", network->filename);
3264
3265         /* Dropping old .network file */
3266         r = link_stop_clients(link, false);
3267         if (r < 0)
3268                 return r;
3269
3270         if (link_dhcp4_server_enabled(link))
3271                 (void) sd_dhcp_server_stop(link->dhcp_server);
3272
3273         r = link_drop_config(link);
3274         if (r < 0)
3275                 return r;
3276
3277         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3278                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3279                 r = link_drop_foreign_config(link);
3280                 if (r < 0)
3281                         return r;
3282         }
3283
3284         link_free_carrier_maps(link);
3285         link_free_engines(link);
3286         link->network = network_unref(link->network);
3287
3288         /* Then, apply new .network file */
3289         r = network_apply(network, link);
3290         if (r < 0)
3291                 return r;
3292
3293         r = link_new_carrier_maps(link);
3294         if (r < 0)
3295                 return r;
3296
3297         link_set_state(link, LINK_STATE_INITIALIZED);
3298         link_dirty(link);
3299
3300         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3301          * link_configure() is called later asynchronously. */
3302         r = link_configure_duid(link);
3303         if (r <= 0)
3304                 return r;
3305
3306         r = link_configure(link);
3307         if (r < 0)
3308                 return r;
3309
3310         return 0;
3311 }
3312
3313 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3314         int r;
3315
3316         r = link_reconfigure_internal(link, m, false);
3317         if (r < 0)
3318                 link_enter_failed(link);
3319
3320         return 1;
3321 }
3322
3323 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3324         int r;
3325
3326         r = link_reconfigure_internal(link, m, true);
3327         if (r < 0)
3328                 link_enter_failed(link);
3329
3330         return 1;
3331 }
3332
3333 int link_reconfigure(Link *link, bool force) {
3334         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3335         int r;
3336
3337         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3338                 return 0;
3339
3340         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3341                                      link->ifindex);
3342         if (r < 0)
3343                 return r;
3344
3345         r = netlink_call_async(link->manager->rtnl, NULL, req,
3346                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3347                                link_netlink_destroy_callback, link);
3348         if (r < 0)
3349                 return r;
3350
3351         link_ref(link);
3352
3353         return 0;
3354 }
3355
3356 static int link_initialized_and_synced(Link *link) {
3357         Network *network;
3358         int r;
3359
3360         assert(link);
3361         assert(link->ifname);
3362         assert(link->manager);
3363
3364         /* We may get called either from the asynchronous netlink callback,
3365          * or directly for link_add() if running in a container. See link_add(). */
3366         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3367                 return 0;
3368
3369         log_link_debug(link, "Link state is up-to-date");
3370         link_set_state(link, LINK_STATE_INITIALIZED);
3371
3372         r = link_new_bound_by_list(link);
3373         if (r < 0)
3374                 return r;
3375
3376         r = link_handle_bound_by_list(link);
3377         if (r < 0)
3378                 return r;
3379
3380         if (!link->network) {
3381                 r = wifi_get_info(link);
3382                 if (r < 0)
3383                         return r;
3384
3385                 r = network_get(link->manager, link->iftype, link->sd_device,
3386                                 link->ifname, link->alternative_names, link->driver,
3387                                 &link->mac, &link->permanent_mac,
3388                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3389                 if (r == -ENOENT) {
3390                         link_enter_unmanaged(link);
3391                         return 0;
3392                 } else if (r == 0 && network->unmanaged) {
3393                         link_enter_unmanaged(link);
3394                         return 0;
3395                 } else if (r < 0)
3396                         return r;
3397
3398                 if (link->flags & IFF_LOOPBACK) {
3399                         if (network->link_local != ADDRESS_FAMILY_NO)
3400                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3401
3402                         if (network->dhcp != ADDRESS_FAMILY_NO)
3403                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3404
3405                         if (network->dhcp_server)
3406                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3407                 }
3408
3409                 r = network_apply(network, link);
3410                 if (r < 0)
3411                         return r;
3412         }
3413
3414         r = link_new_bound_to_list(link);
3415         if (r < 0)
3416                 return r;
3417
3418         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3419          * link_configure() is called later asynchronously. */
3420         r = link_configure_duid(link);
3421         if (r <= 0)
3422                 return r;
3423
3424         r = link_configure(link);
3425         if (r < 0)
3426                 return r;
3427
3428         return 0;
3429 }
3430
3431 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3432         _cleanup_strv_free_ char **s = NULL;
3433         int r;
3434
3435         r = sd_netlink_message_get_errno(m);
3436         if (r < 0) {
3437                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3438                 link_enter_failed(link);
3439                 return 0;
3440         }
3441
3442         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3443         if (r < 0 && r != -ENODATA) {
3444                 link_enter_failed(link);
3445                 return 0;
3446         }
3447
3448         strv_free_and_replace(link->alternative_names, s);
3449
3450         r = link_initialized_and_synced(link);
3451         if (r < 0)
3452                 link_enter_failed(link);
3453         return 1;
3454 }
3455
3456 int link_initialized(Link *link, sd_device *device) {
3457         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3458         int r;
3459
3460         assert(link);
3461         assert(link->manager);
3462         assert(link->manager->rtnl);
3463         assert(device);
3464
3465         if (link->state != LINK_STATE_PENDING)
3466                 return 0;
3467
3468         if (link->sd_device)
3469                 return 0;
3470
3471         log_link_debug(link, "udev initialized link");
3472         link_set_state(link, LINK_STATE_INITIALIZED);
3473
3474         link->sd_device = sd_device_ref(device);
3475
3476         /* udev has initialized the link, but we don't know if we have yet
3477          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3478          * when it returns we know that the pending NEWLINKs have already been
3479          * processed and that we are up-to-date */
3480
3481         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3482                                      link->ifindex);
3483         if (r < 0)
3484                 return r;
3485
3486         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3487                                link_netlink_destroy_callback, link);
3488         if (r < 0)
3489                 return r;
3490
3491         link_ref(link);
3492
3493         return 0;
3494 }
3495
3496 static int link_load(Link *link) {
3497         _cleanup_free_ char *network_file = NULL,
3498                             *addresses = NULL,
3499                             *routes = NULL,
3500                             *dhcp4_address = NULL,
3501                             *ipv4ll_address = NULL;
3502         union in_addr_union address;
3503         int r;
3504
3505         assert(link);
3506
3507         r = parse_env_file(NULL, link->state_file,
3508                            "NETWORK_FILE", &network_file,
3509                            "ADDRESSES", &addresses,
3510                            "ROUTES", &routes,
3511                            "DHCP4_ADDRESS", &dhcp4_address,
3512                            "IPV4LL_ADDRESS", &ipv4ll_address);
3513         if (r < 0 && r != -ENOENT)
3514                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3515
3516         if (network_file) {
3517                 Network *network;
3518                 char *suffix;
3519
3520                 /* drop suffix */
3521                 suffix = strrchr(network_file, '.');
3522                 if (!suffix) {
3523                         log_link_debug(link, "Failed to get network name from %s", network_file);
3524                         goto network_file_fail;
3525                 }
3526                 *suffix = '\0';
3527
3528                 r = network_get_by_name(link->manager, basename(network_file), &network);
3529                 if (r < 0) {
3530                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3531                         goto network_file_fail;
3532                 }
3533
3534                 r = network_apply(network, link);
3535                 if (r < 0)
3536                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3537         }
3538
3539 network_file_fail:
3540
3541         for (const char *p = addresses; p; ) {
3542                 _cleanup_free_ char *address_str = NULL;
3543                 char *prefixlen_str;
3544                 int family;
3545                 unsigned char prefixlen;
3546
3547                 r = extract_first_word(&p, &address_str, NULL, 0);
3548                 if (r < 0)
3549                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3550                 if (r <= 0)
3551                         break;
3552
3553                 prefixlen_str = strchr(address_str, '/');
3554                 if (!prefixlen_str) {
3555                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3556                         continue;
3557                 }
3558                 *prefixlen_str++ = '\0';
3559
3560                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3561                 if (r != 1) {
3562                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3563                         continue;
3564                 }
3565
3566                 r = in_addr_from_string_auto(address_str, &family, &address);
3567                 if (r < 0) {
3568                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3569                         continue;
3570                 }
3571
3572                 r = address_add(link, family, &address, prefixlen, NULL);
3573                 if (r < 0)
3574                         return log_link_error_errno(link, r, "Failed to add address: %m");
3575         }
3576
3577         for (const char *p = routes; p; ) {
3578                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3579                 _cleanup_(route_freep) Route *tmp = NULL;
3580                 _cleanup_free_ char *route_str = NULL;
3581                 char *prefixlen_str;
3582                 Route *route;
3583
3584                 r = extract_first_word(&p, &route_str, NULL, 0);
3585                 if (r < 0)
3586                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3587                 if (r <= 0)
3588                         break;
3589
3590                 prefixlen_str = strchr(route_str, '/');
3591                 if (!prefixlen_str) {
3592                         log_link_debug(link, "Failed to parse route %s", route_str);
3593                         continue;
3594                 }
3595                 *prefixlen_str++ = '\0';
3596
3597                 r = route_new(&tmp);
3598                 if (r < 0)
3599                         return log_oom();
3600
3601                 r = sscanf(prefixlen_str,
3602                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3603                            &tmp->dst_prefixlen,
3604                            &tmp->tos,
3605                            &tmp->priority,
3606                            &tmp->table,
3607                            &tmp->lifetime);
3608                 if (r != 5) {
3609                         log_link_debug(link,
3610                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3611                                        prefixlen_str);
3612                         continue;
3613                 }
3614
3615                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3616                 if (r < 0) {
3617                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3618                         continue;
3619                 }
3620
3621                 r = route_add(link, tmp, &route);
3622                 if (r < 0)
3623                         return log_link_error_errno(link, r, "Failed to add route: %m");
3624
3625                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3626                         r = sd_event_add_time(link->manager->event, &expire,
3627                                               clock_boottime_or_monotonic(),
3628                                               route->lifetime, 0, route_expire_handler, route);
3629                         if (r < 0)
3630                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3631                 }
3632
3633                 sd_event_source_unref(route->expire);
3634                 route->expire = TAKE_PTR(expire);
3635         }
3636
3637         if (dhcp4_address) {
3638                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3639                 if (r < 0) {
3640                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3641                         goto dhcp4_address_fail;
3642                 }
3643
3644                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3645                 if (r < 0)
3646                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3647
3648                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3649                 if (r < 0)
3650                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3651
3652                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3653                 if (r < 0)
3654                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3655         }
3656
3657 dhcp4_address_fail:
3658
3659         if (ipv4ll_address) {
3660                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3661                 if (r < 0) {
3662                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3663                         goto ipv4ll_address_fail;
3664                 }
3665
3666                 r = sd_ipv4ll_new(&link->ipv4ll);
3667                 if (r < 0)
3668                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3669
3670                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3671                 if (r < 0)
3672                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3673
3674                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3675                 if (r < 0)
3676                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3677         }
3678
3679 ipv4ll_address_fail:
3680
3681         return 0;
3682 }
3683
3684 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3685         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3686         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3687         Link *link;
3688         int r;
3689
3690         assert(m);
3691         assert(m->rtnl);
3692         assert(message);
3693         assert(ret);
3694
3695         r = link_new(m, message, ret);
3696         if (r < 0)
3697                 return r;
3698
3699         link = *ret;
3700
3701         log_link_debug(link, "Link %d added", link->ifindex);
3702
3703         r = link_load(link);
3704         if (r < 0)
3705                 return r;
3706
3707         if (path_is_read_only_fs("/sys") <= 0) {
3708                 /* udev should be around */
3709                 sprintf(ifindex_str, "n%d", link->ifindex);
3710                 r = sd_device_new_from_device_id(&device, ifindex_str);
3711                 if (r < 0) {
3712                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3713                         return 0;
3714                 }
3715
3716                 r = sd_device_get_is_initialized(device);
3717                 if (r < 0) {
3718                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3719                         goto failed;
3720                 }
3721                 if (r == 0) {
3722                         /* not yet ready */
3723                         log_link_debug(link, "link pending udev initialization...");
3724                         return 0;
3725                 }
3726
3727                 r = device_is_renaming(device);
3728                 if (r < 0) {
3729                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3730                         goto failed;
3731                 }
3732                 if (r > 0) {
3733                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3734                         return 0;
3735                 }
3736
3737                 r = link_initialized(link, device);
3738                 if (r < 0)
3739                         goto failed;
3740         } else {
3741                 r = link_initialized_and_synced(link);
3742                 if (r < 0)
3743                         goto failed;
3744         }
3745
3746         return 0;
3747 failed:
3748         link_enter_failed(link);
3749         return r;
3750 }
3751
3752 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3753         int r;
3754
3755         assert(link);
3756
3757         log_link_info(link, "Gained IPv6LL");
3758
3759         link->ipv6ll_address = *address;
3760         link_check_ready(link);
3761
3762         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3763                 r = link_acquire_ipv6_conf(link);
3764                 if (r < 0) {
3765                         link_enter_failed(link);
3766                         return r;
3767                 }
3768         }
3769
3770         return 0;
3771 }
3772
3773 static int link_carrier_gained(Link *link) {
3774         int r;
3775
3776         assert(link);
3777
3778         r = wifi_get_info(link);
3779         if (r < 0)
3780                 return r;
3781         if (r > 0) {
3782                 r = link_reconfigure_internal(link, NULL, false);
3783                 if (r < 0) {
3784                         link_enter_failed(link);
3785                         return r;
3786                 }
3787         }
3788
3789         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3790                 r = link_acquire_conf(link);
3791                 if (r < 0) {
3792                         link_enter_failed(link);
3793                         return r;
3794                 }
3795
3796                 link_set_state(link, LINK_STATE_CONFIGURING);
3797                 r = link_request_set_addresses(link);
3798                 if (r < 0)
3799                         return r;
3800         }
3801
3802         r = link_handle_bound_by_list(link);
3803         if (r < 0)
3804                 return r;
3805
3806         return 0;
3807 }
3808
3809 static int link_carrier_lost(Link *link) {
3810         int r;
3811
3812         assert(link);
3813
3814         if (link->network && link->network->ignore_carrier_loss)
3815                 return 0;
3816
3817         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3818          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3819          * configuration and stop the clients as well. */
3820         if (link->setting_mtu)
3821                 return 0;
3822
3823         r = link_stop_clients(link, false);
3824         if (r < 0) {
3825                 link_enter_failed(link);
3826                 return r;
3827         }
3828
3829         if (link_dhcp4_server_enabled(link))
3830                 (void) sd_dhcp_server_stop(link->dhcp_server);
3831
3832         r = link_drop_config(link);
3833         if (r < 0)
3834                 return r;
3835
3836         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3837                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3838                 r = link_drop_foreign_config(link);
3839                 if (r < 0)
3840                         return r;
3841         }
3842
3843         r = link_handle_bound_by_list(link);
3844         if (r < 0)
3845                 return r;
3846
3847         return 0;
3848 }
3849
3850 int link_carrier_reset(Link *link) {
3851         int r;
3852
3853         assert(link);
3854
3855         if (link_has_carrier(link)) {
3856                 r = link_carrier_lost(link);
3857                 if (r < 0)
3858                         return r;
3859
3860                 r = link_carrier_gained(link);
3861                 if (r < 0)
3862                         return r;
3863
3864                 log_link_info(link, "Reset carrier");
3865         }
3866
3867         return 0;
3868 }
3869
3870 /* This is called every time an interface admin state changes to up;
3871  * specifically, when IFF_UP flag changes from unset to set */
3872 static int link_admin_state_up(Link *link) {
3873         int r;
3874
3875         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3876          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3877          * ipv6_mtu_set prevents this from trying to set it too early before
3878          * the link->network has been setup; we only need to reset it
3879          * here if we've already set it during normal initialization. */
3880         if (link->ipv6_mtu_set) {
3881                 r = link_set_ipv6_mtu(link);
3882                 if (r < 0)
3883                         return r;
3884         }
3885
3886         return 0;
3887 }
3888
3889 int link_update(Link *link, sd_netlink_message *m) {
3890         _cleanup_strv_free_ char **s = NULL;
3891         struct ether_addr mac;
3892         const char *ifname;
3893         uint32_t mtu;
3894         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3895         int old_master, r;
3896
3897         assert(link);
3898         assert(link->ifname);
3899         assert(m);
3900
3901         if (link->state == LINK_STATE_LINGER) {
3902                 log_link_info(link, "Link re-added");
3903                 link_set_state(link, LINK_STATE_CONFIGURING);
3904
3905                 r = link_new_carrier_maps(link);
3906                 if (r < 0)
3907                         return r;
3908         }
3909
3910         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3911         if (r >= 0 && !streq(ifname, link->ifname)) {
3912                 Manager *manager = link->manager;
3913
3914                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3915
3916                 link_drop(link);
3917                 r = link_add(manager, m, &link);
3918                 if (r < 0)
3919                         return r;
3920         }
3921
3922         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3923         if (r >= 0)
3924                 strv_free_and_replace(link->alternative_names, s);
3925
3926         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3927         if (r >= 0 && mtu > 0) {
3928                 link->mtu = mtu;
3929                 if (link->original_mtu == 0) {
3930                         link->original_mtu = mtu;
3931                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3932                 }
3933
3934                 if (link->dhcp_client) {
3935                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3936                                                    link->mtu);
3937                         if (r < 0)
3938                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3939                 }
3940
3941                 if (link->radv) {
3942                         r = sd_radv_set_mtu(link->radv, link->mtu);
3943                         if (r < 0)
3944                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3945                 }
3946         }
3947
3948         /* The kernel may broadcast NEWLINK messages without the MAC address
3949            set, simply ignore them. */
3950         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3951         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
3952
3953                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
3954
3955                 log_link_debug(link, "Gained new MAC address: "
3956                                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3957                                mac.ether_addr_octet[0],
3958                                mac.ether_addr_octet[1],
3959                                mac.ether_addr_octet[2],
3960                                mac.ether_addr_octet[3],
3961                                mac.ether_addr_octet[4],
3962                                mac.ether_addr_octet[5]);
3963
3964                 if (link->ipv4ll) {
3965                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
3966
3967                         if (restart) {
3968                                 r = sd_ipv4ll_stop(link->ipv4ll);
3969                                 if (r < 0)
3970                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
3971                         }
3972
3973                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3974                         if (r < 0)
3975                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3976
3977                         if (restart) {
3978                                 r = sd_ipv4ll_start(link->ipv4ll);
3979                                 if (r < 0)
3980                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
3981                         }
3982                 }
3983
3984                 if (link->dhcp_client) {
3985                         r = sd_dhcp_client_set_mac(link->dhcp_client,
3986                                                    (const uint8_t *) &link->mac,
3987                                                    sizeof (link->mac),
3988                                                    ARPHRD_ETHER);
3989                         if (r < 0)
3990                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3991
3992                         r = dhcp4_set_client_identifier(link);
3993                         if (r < 0)
3994                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
3995                 }
3996
3997                 if (link->dhcp6_client) {
3998                         const DUID* duid = link_get_duid(link);
3999                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
4000
4001                         if (restart) {
4002                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
4003                                 if (r < 0)
4004                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
4005                         }
4006
4007                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
4008                                                     (const uint8_t *) &link->mac,
4009                                                     sizeof (link->mac),
4010                                                     ARPHRD_ETHER);
4011                         if (r < 0)
4012                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4013
4014                         if (link->network->iaid_set) {
4015                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4016                                 if (r < 0)
4017                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4018                         }
4019
4020                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4021                                                      duid->type,
4022                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4023                                                      duid->raw_data_len);
4024                         if (r < 0)
4025                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4026
4027                         if (restart) {
4028                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4029                                 if (r < 0)
4030                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4031                         }
4032                 }
4033
4034                 if (link->radv) {
4035                         bool restart = sd_radv_is_running(link->radv);
4036
4037                         if (restart) {
4038                                 r = sd_radv_stop(link->radv);
4039                                 if (r < 0)
4040                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4041                         }
4042
4043                         r = sd_radv_set_mac(link->radv, &link->mac);
4044                         if (r < 0)
4045                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4046
4047                         if (restart) {
4048                                 r = sd_radv_start(link->radv);
4049                                 if (r < 0)
4050                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4051                         }
4052                 }
4053
4054                 if (link->ndisc) {
4055                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4056                         if (r < 0)
4057                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4058                 }
4059         }
4060
4061         old_master = link->master_ifindex;
4062         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4063
4064         link_was_admin_up = link->flags & IFF_UP;
4065         had_carrier = link_has_carrier(link);
4066
4067         r = link_update_flags(link, m, old_master != link->master_ifindex);
4068         if (r < 0)
4069                 return r;
4070
4071         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4072                 log_link_info(link, "Link UP");
4073
4074                 r = link_admin_state_up(link);
4075                 if (r < 0)
4076                         return r;
4077         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4078                 log_link_info(link, "Link DOWN");
4079
4080         r = link_update_lldp(link);
4081         if (r < 0)
4082                 return r;
4083
4084         carrier_gained = !had_carrier && link_has_carrier(link);
4085         carrier_lost = had_carrier && !link_has_carrier(link);
4086
4087         if (carrier_gained) {
4088                 log_link_info(link, "Gained carrier");
4089
4090                 r = link_carrier_gained(link);
4091                 if (r < 0)
4092                         return r;
4093         } else if (carrier_lost) {
4094                 log_link_info(link, "Lost carrier");
4095
4096                 r = link_carrier_lost(link);
4097                 if (r < 0)
4098                         return r;
4099         }
4100
4101         return 0;
4102 }
4103
4104 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4105         bool space = false;
4106         Iterator i;
4107         Link *link;
4108
4109         assert(f);
4110         assert(prefix);
4111
4112         if (hashmap_isempty(h))
4113                 return;
4114
4115         fputs(prefix, f);
4116         HASHMAP_FOREACH(link, h, i) {
4117                 if (space)
4118                         fputc(' ', f);
4119
4120                 fprintf(f, "%i", link->ifindex);
4121                 space = true;
4122         }
4123
4124         fputc('\n', f);
4125 }
4126
4127 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4128         for (unsigned j = 0; j < n_dns; j++) {
4129                 const char *str;
4130
4131                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4132                         continue;
4133
4134                 str = in_addr_full_to_string(dns[j]);
4135                 if (!str)
4136                         continue;
4137
4138                 if (*space)
4139                         fputc(' ', f);
4140                 fputs(str, f);
4141                 *space = true;
4142         }
4143 }
4144
4145 static void serialize_addresses(
4146                 FILE *f,
4147                 const char *lvalue,
4148                 bool *space,
4149                 char **addresses,
4150                 sd_dhcp_lease *lease,
4151                 bool conditional,
4152                 sd_dhcp_lease_server_type what,
4153                 sd_dhcp6_lease *lease6,
4154                 bool conditional6,
4155                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4156                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4157         int r;
4158
4159         bool _space = false;
4160         if (!space)
4161                 space = &_space;
4162
4163         if (lvalue)
4164                 fprintf(f, "%s=", lvalue);
4165         fputstrv(f, addresses, NULL, space);
4166
4167         if (lease && conditional) {
4168                 const struct in_addr *lease_addresses;
4169
4170                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4171                 if (r > 0)
4172                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4173         }
4174
4175         if (lease6 && conditional6 && lease6_get_addr) {
4176                 const struct in6_addr *in6_addrs;
4177
4178                 r = lease6_get_addr(lease6, &in6_addrs);
4179                 if (r > 0)
4180                         serialize_in6_addrs(f, in6_addrs, r, space);
4181         }
4182
4183         if (lease6 && conditional6 && lease6_get_fqdn) {
4184                 char **in6_hosts;
4185
4186                 r = lease6_get_fqdn(lease6, &in6_hosts);
4187                 if (r > 0)
4188                         fputstrv(f, in6_hosts, NULL, space);
4189         }
4190
4191         if (lvalue)
4192                 fputc('\n', f);
4193 }
4194
4195 int link_save(Link *link) {
4196         const char *admin_state, *oper_state, *carrier_state, *address_state;
4197         _cleanup_free_ char *temp_path = NULL;
4198         _cleanup_fclose_ FILE *f = NULL;
4199         Route *route;
4200         Address *a;
4201         Iterator i;
4202         int r;
4203
4204         assert(link);
4205         assert(link->state_file);
4206         assert(link->lease_file);
4207         assert(link->manager);
4208
4209         if (link->state == LINK_STATE_LINGER) {
4210                 (void) unlink(link->state_file);
4211                 return 0;
4212         }
4213
4214         link_lldp_save(link);
4215
4216         admin_state = link_state_to_string(link->state);
4217         assert(admin_state);
4218
4219         oper_state = link_operstate_to_string(link->operstate);
4220         assert(oper_state);
4221
4222         carrier_state = link_carrier_state_to_string(link->carrier_state);
4223         assert(carrier_state);
4224
4225         address_state = link_address_state_to_string(link->address_state);
4226         assert(address_state);
4227
4228         r = fopen_temporary(link->state_file, &f, &temp_path);
4229         if (r < 0)
4230                 goto fail;
4231
4232         (void) fchmod(fileno(f), 0644);
4233
4234         fprintf(f,
4235                 "# This is private data. Do not parse.\n"
4236                 "ADMIN_STATE=%s\n"
4237                 "OPER_STATE=%s\n"
4238                 "CARRIER_STATE=%s\n"
4239                 "ADDRESS_STATE=%s\n",
4240                 admin_state, oper_state, carrier_state, address_state);
4241
4242         if (link->network) {
4243                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4244                 const char *dhcp_domainname = NULL, *p;
4245                 sd_dhcp6_lease *dhcp6_lease = NULL;
4246                 bool space;
4247
4248                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4249                         yes_no(link->network->required_for_online));
4250
4251                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4252                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4253                         strempty(link_operstate_to_string(st.min)),
4254                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4255                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4256
4257                 if (link->dhcp6_client) {
4258                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4259                         if (r < 0 && r != -ENOMSG)
4260                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4261                 }
4262
4263                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4264
4265                 /************************************************************/
4266
4267                 fputs("DNS=", f);
4268                 space = false;
4269                 if (link->n_dns != (unsigned) -1)
4270                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4271                 else
4272                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4273
4274                 serialize_addresses(f, NULL, &space,
4275                                     NULL,
4276                                     link->dhcp_lease,
4277                                     link->network->dhcp_use_dns,
4278                                     SD_DHCP_LEASE_DNS,
4279                                     dhcp6_lease,
4280                                     link->network->dhcp6_use_dns,
4281                                     sd_dhcp6_lease_get_dns,
4282                                     NULL);
4283
4284                 /* Make sure to flush out old entries before we use the NDisc data */
4285                 ndisc_vacuum(link);
4286
4287                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4288                         NDiscRDNSS *dd;
4289
4290                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4291                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4292                 }
4293
4294                 fputc('\n', f);
4295
4296                 /************************************************************/
4297
4298                 serialize_addresses(f, "NTP", NULL,
4299                                     link->ntp ?: link->network->ntp,
4300                                     link->dhcp_lease,
4301                                     link->network->dhcp_use_ntp,
4302                                     SD_DHCP_LEASE_NTP,
4303                                     dhcp6_lease,
4304                                     link->network->dhcp6_use_ntp,
4305                                     sd_dhcp6_lease_get_ntp_addrs,
4306                                     sd_dhcp6_lease_get_ntp_fqdn);
4307
4308                 serialize_addresses(f, "SIP", NULL,
4309                                     NULL,
4310                                     link->dhcp_lease,
4311                                     link->network->dhcp_use_sip,
4312                                     SD_DHCP_LEASE_SIP,
4313                                     NULL, false, NULL, NULL);
4314
4315                 /************************************************************/
4316
4317                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4318                         if (link->dhcp_lease) {
4319                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4320                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4321                         }
4322                         if (dhcp6_lease)
4323                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4324                 }
4325
4326                 fputs("DOMAINS=", f);
4327                 space = false;
4328                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4329                         fputs_with_space(f, p, NULL, &space);
4330
4331                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4332                         if (dhcp_domainname)
4333                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4334                         if (dhcp_domains)
4335                                 fputstrv(f, dhcp_domains, NULL, &space);
4336                         if (dhcp6_domains)
4337                                 fputstrv(f, dhcp6_domains, NULL, &space);
4338                 }
4339
4340                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4341                         NDiscDNSSL *dd;
4342
4343                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4344                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4345                 }
4346
4347                 fputc('\n', f);
4348
4349                 /************************************************************/
4350
4351                 fputs("ROUTE_DOMAINS=", f);
4352                 space = false;
4353                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4354                         fputs_with_space(f, p, NULL, &space);
4355
4356                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4357                         if (dhcp_domainname)
4358                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4359                         if (dhcp_domains)
4360                                 fputstrv(f, dhcp_domains, NULL, &space);
4361                         if (dhcp6_domains)
4362                                 fputstrv(f, dhcp6_domains, NULL, &space);
4363                 }
4364
4365                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4366                         NDiscDNSSL *dd;
4367
4368                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4369                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4370                 }
4371
4372                 fputc('\n', f);
4373
4374                 /************************************************************/
4375
4376                 fprintf(f, "LLMNR=%s\n",
4377                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4378
4379                 /************************************************************/
4380
4381                 fprintf(f, "MDNS=%s\n",
4382                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4383
4384                 /************************************************************/
4385
4386                 int dns_default_route =
4387                         link->dns_default_route >= 0 ? link->dns_default_route :
4388                         link->network->dns_default_route;
4389                 if (dns_default_route >= 0)
4390                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4391
4392                 /************************************************************/
4393
4394                 DnsOverTlsMode dns_over_tls_mode =
4395                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4396                         link->network->dns_over_tls_mode;
4397                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4398                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4399
4400                 /************************************************************/
4401
4402                 DnssecMode dnssec_mode =
4403                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4404                         link->network->dnssec_mode;
4405                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4406                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4407
4408                 /************************************************************/
4409
4410                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4411                 if (set_isempty(nta_anchors))
4412                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4413
4414                 if (!set_isempty(nta_anchors)) {
4415                         const char *n;
4416
4417                         fputs("DNSSEC_NTA=", f);
4418                         space = false;
4419                         SET_FOREACH(n, nta_anchors, i)
4420                                 fputs_with_space(f, n, NULL, &space);
4421                         fputc('\n', f);
4422                 }
4423
4424                 /************************************************************/
4425
4426                 fputs("ADDRESSES=", f);
4427                 space = false;
4428                 SET_FOREACH(a, link->addresses, i) {
4429                         _cleanup_free_ char *address_str = NULL;
4430
4431                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4432                         if (r < 0)
4433                                 goto fail;
4434
4435                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4436                         space = true;
4437                 }
4438                 fputc('\n', f);
4439
4440                 /************************************************************/
4441
4442                 fputs("ROUTES=", f);
4443                 space = false;
4444                 SET_FOREACH(route, link->routes, i) {
4445                         _cleanup_free_ char *route_str = NULL;
4446
4447                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4448                         if (r < 0)
4449                                 goto fail;
4450
4451                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4452                                 space ? " " : "", route_str,
4453                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4454                         space = true;
4455                 }
4456
4457                 fputc('\n', f);
4458         }
4459
4460         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4461         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4462
4463         if (link->dhcp_lease) {
4464                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4465                 if (r < 0)
4466                         goto fail;
4467
4468                 fprintf(f,
4469                         "DHCP_LEASE=%s\n",
4470                         link->lease_file);
4471         } else
4472                 (void) unlink(link->lease_file);
4473
4474         if (link->ipv4ll) {
4475                 struct in_addr address;
4476
4477                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4478                 if (r >= 0) {
4479                         fputs("IPV4LL_ADDRESS=", f);
4480                         serialize_in_addrs(f, &address, 1, false, NULL);
4481                         fputc('\n', f);
4482                 }
4483         }
4484
4485         if (link->dhcp6_client) {
4486                 _cleanup_free_ char *duid = NULL;
4487                 uint32_t iaid;
4488
4489                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4490                 if (r >= 0)
4491                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4492
4493                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4494                 if (r >= 0)
4495                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4496         }
4497
4498         r = fflush_and_check(f);
4499         if (r < 0)
4500                 goto fail;
4501
4502         if (rename(temp_path, link->state_file) < 0) {
4503                 r = -errno;
4504                 goto fail;
4505         }
4506
4507         return 0;
4508
4509 fail:
4510         (void) unlink(link->state_file);
4511         if (temp_path)
4512                 (void) unlink(temp_path);
4513
4514         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4515 }
4516
4517 /* The serialized state in /run is no longer up-to-date. */
4518 void link_dirty(Link *link) {
4519         int r;
4520
4521         assert(link);
4522
4523         /* mark manager dirty as link is dirty */
4524         manager_dirty(link->manager);
4525
4526         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4527         if (r <= 0)
4528                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4529                 return;
4530         link_ref(link);
4531 }
4532
4533 /* The serialized state in /run is up-to-date */
4534 void link_clean(Link *link) {
4535         assert(link);
4536         assert(link->manager);
4537
4538         link_unref(set_remove(link->manager->dirty_links, link));
4539 }
4540
4541 int link_save_and_clean(Link *link) {
4542         int r;
4543
4544         r = link_save(link);
4545         if (r < 0)
4546                 return r;
4547
4548         link_clean(link);
4549         return 0;
4550 }
4551
4552 static const char* const link_state_table[_LINK_STATE_MAX] = {
4553         [LINK_STATE_PENDING] = "pending",
4554         [LINK_STATE_INITIALIZED] = "initialized",
4555         [LINK_STATE_CONFIGURING] = "configuring",
4556         [LINK_STATE_CONFIGURED] = "configured",
4557         [LINK_STATE_UNMANAGED] = "unmanaged",
4558         [LINK_STATE_FAILED] = "failed",
4559         [LINK_STATE_LINGER] = "linger",
4560 };
4561
4562 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4563
4564 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4565         const char *err_msg = NULL;
4566
4567         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4568         return log_link_full(link, level, err,
4569                              "%s: %s%s%s%m",
4570                              msg,
4571                              strempty(err_msg),
4572                              err_msg && !endswith(err_msg, ".") ? "." : "",
4573                              err_msg ? " " : "");
4574 }