src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5 #include <linux/if_arp.h>
   6 #include <linux/if_link.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "bond.h"
  11 #include "bridge.h"
  12 #include "bus-util.h"
  13 #include "dhcp-identifier.h"
  14 #include "dhcp-lease-internal.h"
  15 #include "env-file.h"
  16 #include "ethtool-util.h"
  17 #include "fd-util.h"
  18 #include "fileio.h"
  19 #include "ipvlan.h"
  20 #include "missing_network.h"
  21 #include "netlink-util.h"
  22 #include "network-internal.h"
  23 #include "networkd-can.h"
  24 #include "networkd-dhcp-server.h"
  25 #include "networkd-dhcp4.h"
  26 #include "networkd-dhcp6.h"
  27 #include "networkd-ipv4ll.h"
  28 #include "networkd-ipv6-proxy-ndp.h"
  29 #include "networkd-link-bus.h"
  30 #include "networkd-link.h"
  31 #include "networkd-lldp-tx.h"
  32 #include "networkd-manager.h"
  33 #include "networkd-ndisc.h"
  34 #include "networkd-neighbor.h"
  35 #include "networkd-sriov.h"
  36 #include "networkd-radv.h"
  37 #include "networkd-routing-policy-rule.h"
  38 #include "networkd-wifi.h"
  39 #include "set.h"
  40 #include "socket-util.h"
  41 #include "stat-util.h"
  42 #include "stdio-util.h"
  43 #include "string-table.h"
  44 #include "strv.h"
  45 #include "sysctl-util.h"
  46 #include "tc.h"
  47 #include "tmpfile-util.h"
  48 #include "udev-util.h"
  49 #include "util.h"
  50 #include "vrf.h"
  51
  52 uint32_t link_get_vrf_table(Link *link) {
  53         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  54 }
  55
  56 uint32_t link_get_dhcp_route_table(Link *link) {
  57         /* When the interface is part of an VRF use the VRFs routing table, unless
  58          * another table is explicitly specified. */
  59         if (link->network->dhcp_route_table_set)
  60                 return link->network->dhcp_route_table;
  61         return link_get_vrf_table(link);
  62 }
  63
  64 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  65         if (link->network->ipv6_accept_ra_route_table_set)
  66                 return link->network->ipv6_accept_ra_route_table;
  67         return link_get_vrf_table(link);
  68 }
  69
  70 DUID* link_get_duid(Link *link) {
  71         if (link->network->duid.type != _DUID_TYPE_INVALID)
  72                 return &link->network->duid;
  73         else
  74                 return &link->manager->duid;
  75 }
  76
  77 static bool link_dhcp6_enabled(Link *link) {
  78         assert(link);
  79
  80         if (!socket_ipv6_is_supported())
  81                 return false;
  82
  83         if (link->flags & IFF_LOOPBACK)
  84                 return false;
  85
  86         if (!link->network)
  87                 return false;
  88
  89         if (link->network->bond)
  90                 return false;
  91
  92         if (link->iftype == ARPHRD_CAN)
  93                 return false;
  94
  95         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
  96 }
  97
  98 static bool link_dhcp4_enabled(Link *link) {
  99         assert(link);
 100
 101         if (link->flags & IFF_LOOPBACK)
 102                 return false;
 103
 104         if (!link->network)
 105                 return false;
 106
 107         if (link->network->bond)
 108                 return false;
 109
 110         if (link->iftype == ARPHRD_CAN)
 111                 return false;
 112
 113         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 114 }
 115
 116 static bool link_dhcp4_server_enabled(Link *link) {
 117         assert(link);
 118
 119         if (link->flags & IFF_LOOPBACK)
 120                 return false;
 121
 122         if (!link->network)
 123                 return false;
 124
 125         if (link->network->bond)
 126                 return false;
 127
 128         if (link->iftype == ARPHRD_CAN)
 129                 return false;
 130
 131         return link->network->dhcp_server;
 132 }
 133
 134 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
 135         assert(link);
 136         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 137
 138         if (link->flags & IFF_LOOPBACK)
 139                 return false;
 140
 141         if (!link->network)
 142                 return false;
 143
 144         if (link->iftype == ARPHRD_CAN)
 145                 return false;
 146
 147         if (STRPTR_IN_SET(link->kind,
 148                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
 149                           "vti6", "nlmon", "xfrm"))
 150                 return false;
 151
 152         /* L3 or L3S mode do not support ARP. */
 153         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 154                 return false;
 155
 156         if (link->network->bond)
 157                 return false;
 158
 159         return link->network->link_local & mask;
 160 }
 161
 162 static bool link_ipv6ll_enabled(Link *link) {
 163         assert(link);
 164
 165         if (!socket_ipv6_is_supported())
 166                 return false;
 167
 168         if (link->flags & IFF_LOOPBACK)
 169                 return false;
 170
 171         if (!link->network)
 172                 return false;
 173
 174         if (link->iftype == ARPHRD_CAN)
 175                 return false;
 176
 177         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
 178                 return false;
 179
 180         if (link->network->bond)
 181                 return false;
 182
 183         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 184 }
 185
 186 static bool link_ipv6_enabled(Link *link) {
 187         assert(link);
 188
 189         if (!socket_ipv6_is_supported())
 190                 return false;
 191
 192         if (link->network->bond)
 193                 return false;
 194
 195         if (link->iftype == ARPHRD_CAN)
 196                 return false;
 197
 198         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 199         if (link_ipv6ll_enabled(link))
 200                 return true;
 201
 202         if (network_has_static_ipv6_configurations(link->network))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static bool link_radv_enabled(Link *link) {
 209         assert(link);
 210
 211         if (!link_ipv6ll_enabled(link))
 212                 return false;
 213
 214         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 215 }
 216
 217 static bool link_ipv4_forward_enabled(Link *link) {
 218         assert(link);
 219
 220         if (link->flags & IFF_LOOPBACK)
 221                 return false;
 222
 223         if (!link->network)
 224                 return false;
 225
 226         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 227                 return false;
 228
 229         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 230 }
 231
 232 static bool link_ipv6_forward_enabled(Link *link) {
 233         assert(link);
 234
 235         if (!socket_ipv6_is_supported())
 236                 return false;
 237
 238         if (link->flags & IFF_LOOPBACK)
 239                 return false;
 240
 241         if (!link->network)
 242                 return false;
 243
 244         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 245                 return false;
 246
 247         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 248 }
 249
 250 static bool link_proxy_arp_enabled(Link *link) {
 251         assert(link);
 252
 253         if (link->flags & IFF_LOOPBACK)
 254                 return false;
 255
 256         if (!link->network)
 257                 return false;
 258
 259         if (link->network->proxy_arp < 0)
 260                 return false;
 261
 262         return true;
 263 }
 264
 265 static bool link_ipv6_accept_ra_enabled(Link *link) {
 266         assert(link);
 267
 268         if (!socket_ipv6_is_supported())
 269                 return false;
 270
 271         if (link->flags & IFF_LOOPBACK)
 272                 return false;
 273
 274         if (!link->network)
 275                 return false;
 276
 277         if (!link_ipv6ll_enabled(link))
 278                 return false;
 279
 280         /* If unset use system default (enabled if local forwarding is disabled.
 281          * disabled if local forwarding is enabled).
 282          * If set, ignore or enforce RA independent of local forwarding state.
 283          */
 284         if (link->network->ipv6_accept_ra < 0)
 285                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 286                 return !link_ipv6_forward_enabled(link);
 287         else if (link->network->ipv6_accept_ra > 0)
 288                 /* accept RA even if ip_forward is enabled */
 289                 return true;
 290         else
 291                 /* ignore RA */
 292                 return false;
 293 }
 294
 295 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 296         assert(link);
 297
 298         if (!socket_ipv6_is_supported())
 299                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 300
 301         if (link->flags & IFF_LOOPBACK)
 302                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 303
 304         if (!link->network)
 305                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 306
 307         return link->network->ipv6_privacy_extensions;
 308 }
 309
 310 static int link_update_ipv6_sysctl(Link *link) {
 311         bool enabled;
 312         int r;
 313
 314         if (link->flags & IFF_LOOPBACK)
 315                 return 0;
 316
 317         enabled = link_ipv6_enabled(link);
 318         if (enabled) {
 319                 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
 320                 if (r < 0)
 321                         return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
 322
 323                 log_link_info(link, "IPv6 successfully enabled");
 324         }
 325
 326         return 0;
 327 }
 328
 329 static bool link_is_enslaved(Link *link) {
 330         if (link->flags & IFF_SLAVE)
 331                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 332                 return true;
 333
 334         if (!link->network)
 335                 return false;
 336
 337         if (link->master_ifindex > 0 && link->network->bridge)
 338                 return true;
 339
 340         /* TODO: add conditions for other netdevs. */
 341
 342         return false;
 343 }
 344
 345 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 346         Link *master;
 347
 348         if (!netdev)
 349                 return;
 350
 351         if (netdev->ifindex <= 0)
 352                 return;
 353
 354         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 355                 return;
 356
 357         link_update_operstate(master, true);
 358 }
 359
 360 void link_update_operstate(Link *link, bool also_update_master) {
 361         LinkOperationalState operstate;
 362         LinkCarrierState carrier_state;
 363         LinkAddressState address_state;
 364         _cleanup_strv_free_ char **p = NULL;
 365         uint8_t scope = RT_SCOPE_NOWHERE;
 366         bool changed = false;
 367         Address *address;
 368         Iterator i;
 369
 370         assert(link);
 371
 372         if (link->kernel_operstate == IF_OPER_DORMANT)
 373                 carrier_state = LINK_CARRIER_STATE_DORMANT;
 374         else if (link_has_carrier(link)) {
 375                 if (link_is_enslaved(link))
 376                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
 377                 else
 378                         carrier_state = LINK_CARRIER_STATE_CARRIER;
 379         } else if (link->flags & IFF_UP)
 380                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
 381         else
 382                 carrier_state = LINK_CARRIER_STATE_OFF;
 383
 384         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
 385                 Link *slave;
 386
 387                 SET_FOREACH(slave, link->slaves, i) {
 388                         link_update_operstate(slave, false);
 389
 390                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
 391                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
 392                 }
 393         }
 394
 395         SET_FOREACH(address, link->addresses, i) {
 396                 if (!address_is_ready(address))
 397                         continue;
 398
 399                 if (address->scope < scope)
 400                         scope = address->scope;
 401         }
 402
 403         /* for operstate we also take foreign addresses into account */
 404         SET_FOREACH(address, link->addresses_foreign, i) {
 405                 if (!address_is_ready(address))
 406                         continue;
 407
 408                 if (address->scope < scope)
 409                         scope = address->scope;
 410         }
 411
 412         if (scope < RT_SCOPE_SITE)
 413                 /* universally accessible addresses found */
 414                 address_state = LINK_ADDRESS_STATE_ROUTABLE;
 415         else if (scope < RT_SCOPE_HOST)
 416                 /* only link or site local addresses found */
 417                 address_state = LINK_ADDRESS_STATE_DEGRADED;
 418         else
 419                 /* no useful addresses found */
 420                 address_state = LINK_ADDRESS_STATE_OFF;
 421
 422         /* Mapping of address and carrier state vs operational state
 423          *                                                     carrier state
 424          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 425          *                 ------------------------------------------------------------------------------
 426          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 427          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
 428          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
 429          */
 430
 431         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
 432                 operstate = (LinkOperationalState) carrier_state;
 433         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
 434                 operstate = LINK_OPERSTATE_ROUTABLE;
 435         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
 436                 operstate = LINK_OPERSTATE_DEGRADED;
 437         else
 438                 operstate = LINK_OPERSTATE_ENSLAVED;
 439
 440         if (link->carrier_state != carrier_state) {
 441                 link->carrier_state = carrier_state;
 442                 changed = true;
 443                 if (strv_extend(&p, "CarrierState") < 0)
 444                         log_oom();
 445         }
 446
 447         if (link->address_state != address_state) {
 448                 link->address_state = address_state;
 449                 changed = true;
 450                 if (strv_extend(&p, "AddressState") < 0)
 451                         log_oom();
 452         }
 453
 454         if (link->operstate != operstate) {
 455                 link->operstate = operstate;
 456                 changed = true;
 457                 if (strv_extend(&p, "OperationalState") < 0)
 458                         log_oom();
 459         }
 460
 461         if (p)
 462                 link_send_changed_strv(link, p);
 463         if (changed)
 464                 link_dirty(link);
 465
 466         if (also_update_master && link->network) {
 467                 link_update_master_operstate(link, link->network->bond);
 468                 link_update_master_operstate(link, link->network->bridge);
 469         }
 470 }
 471
 472 #define FLAG_STRING(string, flag, old, new) \
 473         (((old ^ new) & flag) \
 474                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 475                 : "")
 476
 477 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 478         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 479         uint8_t operstate;
 480         int r;
 481
 482         assert(link);
 483
 484         r = sd_rtnl_message_link_get_flags(m, &flags);
 485         if (r < 0)
 486                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 487
 488         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 489         if (r < 0)
 490                 /* if we got a message without operstate, take it to mean
 491                    the state was unchanged */
 492                 operstate = link->kernel_operstate;
 493
 494         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 495                 return 0;
 496
 497         if (link->flags != flags) {
 498                 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
 499                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 500                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 501                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 502                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 503                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 504                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 505                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 506                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 507                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 508                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 509                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 510                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 511                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 512                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 513                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 514                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 515                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 516                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 517                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 518
 519                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 520                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 521                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 522                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 523                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 524                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 525                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 526                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 527
 528                 /* link flags are currently at most 18 bits, let's align to
 529                  * printing 20 */
 530                 if (unknown_flags_added)
 531                         log_link_debug(link,
 532                                        "Unknown link flags gained: %#.5x (ignoring)",
 533                                        unknown_flags_added);
 534
 535                 if (unknown_flags_removed)
 536                         log_link_debug(link,
 537                                        "Unknown link flags lost: %#.5x (ignoring)",
 538                                        unknown_flags_removed);
 539         }
 540
 541         link->flags = flags;
 542         link->kernel_operstate = operstate;
 543
 544         link_update_operstate(link, true);
 545
 546         return 0;
 547 }
 548
 549 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 550         _cleanup_(link_unrefp) Link *link = NULL;
 551         const char *ifname, *kind = NULL;
 552         unsigned short iftype;
 553         int r, ifindex;
 554         uint16_t type;
 555
 556         assert(manager);
 557         assert(message);
 558         assert(ret);
 559
 560         /* check for link kind */
 561         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 562         if (r == 0) {
 563                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 564                 r = sd_netlink_message_exit_container(message);
 565                 if (r < 0)
 566                         return r;
 567         }
 568
 569         r = sd_netlink_message_get_type(message, &type);
 570         if (r < 0)
 571                 return r;
 572         else if (type != RTM_NEWLINK)
 573                 return -EINVAL;
 574
 575         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 576         if (r < 0)
 577                 return r;
 578         else if (ifindex <= 0)
 579                 return -EINVAL;
 580
 581         r = sd_rtnl_message_link_get_type(message, &iftype);
 582         if (r < 0)
 583                 return r;
 584
 585         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 586         if (r < 0)
 587                 return r;
 588
 589         link = new(Link, 1);
 590         if (!link)
 591                 return -ENOMEM;
 592
 593         *link = (Link) {
 594                 .n_ref = 1,
 595                 .manager = manager,
 596                 .state = LINK_STATE_PENDING,
 597                 .ifindex = ifindex,
 598                 .iftype = iftype,
 599
 600                 .n_dns = (unsigned) -1,
 601                 .dns_default_route = -1,
 602                 .llmnr = _RESOLVE_SUPPORT_INVALID,
 603                 .mdns = _RESOLVE_SUPPORT_INVALID,
 604                 .dnssec_mode = _DNSSEC_MODE_INVALID,
 605                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
 606         };
 607
 608         link->ifname = strdup(ifname);
 609         if (!link->ifname)
 610                 return -ENOMEM;
 611
 612         if (kind) {
 613                 link->kind = strdup(kind);
 614                 if (!link->kind)
 615                         return -ENOMEM;
 616         }
 617
 618         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 619         if (r < 0)
 620                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 621
 622         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 623         if (r < 0)
 624                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 625
 626         r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
 627         if (r < 0)
 628                 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
 629
 630         r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
 631         if (r < 0)
 632                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
 633
 634         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
 635         if (r < 0 && r != -ENODATA)
 636                 return r;
 637
 638         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 639                 return -ENOMEM;
 640
 641         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 642                 return -ENOMEM;
 643
 644         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 645                 return -ENOMEM;
 646
 647         r = hashmap_ensure_allocated(&manager->links, NULL);
 648         if (r < 0)
 649                 return r;
 650
 651         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 652         if (r < 0)
 653                 return r;
 654
 655         r = link_update_flags(link, message, false);
 656         if (r < 0)
 657                 return r;
 658
 659         *ret = TAKE_PTR(link);
 660
 661         return 0;
 662 }
 663
 664 void link_ntp_settings_clear(Link *link) {
 665         link->ntp = strv_free(link->ntp);
 666 }
 667
 668 void link_dns_settings_clear(Link *link) {
 669         if (link->n_dns != (unsigned) -1)
 670                 for (unsigned i = 0; i < link->n_dns; i++)
 671                         in_addr_full_free(link->dns[i]);
 672         link->dns = mfree(link->dns);
 673         link->n_dns = (unsigned) -1;
 674
 675         link->search_domains = ordered_set_free_free(link->search_domains);
 676         link->route_domains = ordered_set_free_free(link->route_domains);
 677
 678         link->dns_default_route = -1;
 679         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 680         link->mdns = _RESOLVE_SUPPORT_INVALID;
 681         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 682         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 683
 684         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 685 }
 686
 687 static void link_free_engines(Link *link) {
 688         if (!link)
 689                 return;
 690
 691         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 692         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 693         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 694         link->dhcp_routes = set_free(link->dhcp_routes);
 695
 696         link->lldp = sd_lldp_unref(link->lldp);
 697
 698         ndisc_flush(link);
 699
 700         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 701         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 702         link->ndisc = sd_ndisc_unref(link->ndisc);
 703         link->radv = sd_radv_unref(link->radv);
 704 }
 705
 706 static Link *link_free(Link *link) {
 707         Address *address;
 708
 709         assert(link);
 710
 711         link_ntp_settings_clear(link);
 712         link_dns_settings_clear(link);
 713
 714         link->routes = set_free(link->routes);
 715         link->routes_foreign = set_free(link->routes_foreign);
 716
 717         link->nexthops = set_free(link->nexthops);
 718         link->nexthops_foreign = set_free(link->nexthops_foreign);
 719
 720         link->neighbors = set_free(link->neighbors);
 721         link->neighbors_foreign = set_free(link->neighbors_foreign);
 722
 723         link->addresses = set_free(link->addresses);
 724         link->addresses_foreign = set_free(link->addresses_foreign);
 725
 726         while ((address = link->pool_addresses)) {
 727                 LIST_REMOVE(addresses, link->pool_addresses, address);
 728                 address_free(address);
 729         }
 730
 731         link_lldp_emit_stop(link);
 732         link_free_engines(link);
 733         free(link->lease_file);
 734         free(link->lldp_file);
 735
 736         free(link->ifname);
 737         strv_free(link->alternative_names);
 738         free(link->kind);
 739         free(link->ssid);
 740         free(link->driver);
 741
 742         (void) unlink(link->state_file);
 743         free(link->state_file);
 744
 745         sd_device_unref(link->sd_device);
 746
 747         hashmap_free(link->bound_to_links);
 748         hashmap_free(link->bound_by_links);
 749
 750         set_free_with_destructor(link->slaves, link_unref);
 751
 752         network_unref(link->network);
 753
 754         return mfree(link);
 755 }
 756
 757 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 758
 759 int link_get(Manager *m, int ifindex, Link **ret) {
 760         Link *link;
 761
 762         assert(m);
 763         assert(ifindex > 0);
 764         assert(ret);
 765
 766         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 767         if (!link)
 768                 return -ENODEV;
 769
 770         *ret = link;
 771
 772         return 0;
 773 }
 774
 775 void link_set_state(Link *link, LinkState state) {
 776         assert(link);
 777
 778         if (link->state == state)
 779                 return;
 780
 781         log_link_debug(link, "State changed: %s -> %s",
 782                        link_state_to_string(link->state),
 783                        link_state_to_string(state));
 784
 785         link->state = state;
 786
 787         link_send_changed(link, "AdministrativeState", NULL);
 788 }
 789
 790 static void link_enter_unmanaged(Link *link) {
 791         assert(link);
 792
 793         link_set_state(link, LINK_STATE_UNMANAGED);
 794
 795         link_dirty(link);
 796 }
 797
 798 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 799         int r = 0, k;
 800         Address *ad;
 801
 802         assert(link);
 803         assert(link->manager);
 804         assert(link->manager->event);
 805
 806         bool keep_dhcp = may_keep_dhcp &&
 807                          link->network &&
 808                          (link->manager->restarting ||
 809                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 810
 811         if (link->dhcp_client && !keep_dhcp) {
 812                 k = sd_dhcp_client_stop(link->dhcp_client);
 813                 if (k < 0)
 814                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 815         }
 816
 817         if (link->ipv4ll) {
 818                 k = sd_ipv4ll_stop(link->ipv4ll);
 819                 if (k < 0)
 820                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 821         }
 822
 823         if (link->network)
 824                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 825                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 826                                 k = sd_ipv4acd_stop(ad->acd);
 827                                 if (k < 0)
 828                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 829                         }
 830
 831         if (link->dhcp6_client) {
 832                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 833                 if (k < 0)
 834                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 835         }
 836
 837         if (link->ndisc) {
 838                 k = sd_ndisc_stop(link->ndisc);
 839                 if (k < 0)
 840                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 841         }
 842
 843         if (link->radv) {
 844                 k = sd_radv_stop(link->radv);
 845                 if (k < 0)
 846                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 847         }
 848
 849         link_lldp_emit_stop(link);
 850         return r;
 851 }
 852
 853 void link_enter_failed(Link *link) {
 854         assert(link);
 855
 856         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 857                 return;
 858
 859         log_link_warning(link, "Failed");
 860
 861         link_set_state(link, LINK_STATE_FAILED);
 862
 863         link_stop_clients(link, false);
 864
 865         link_dirty(link);
 866 }
 867
 868 static int link_join_netdevs_after_configured(Link *link) {
 869         NetDev *netdev;
 870         Iterator i;
 871         int r;
 872
 873         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 874                 if (netdev->ifindex > 0)
 875                         /* Assume already enslaved. */
 876                         continue;
 877
 878                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 879                         continue;
 880
 881                 log_struct(LOG_DEBUG,
 882                            LOG_LINK_INTERFACE(link),
 883                            LOG_NETDEV_INTERFACE(netdev),
 884                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 885
 886                 r = netdev_join(netdev, link, NULL);
 887                 if (r < 0)
 888                         return log_struct_errno(LOG_WARNING, r,
 889                                                 LOG_LINK_INTERFACE(link),
 890                                                 LOG_NETDEV_INTERFACE(netdev),
 891                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 892         }
 893
 894         return 0;
 895 }
 896
 897 static void link_enter_configured(Link *link) {
 898         assert(link);
 899         assert(link->network);
 900
 901         if (link->state != LINK_STATE_CONFIGURING)
 902                 return;
 903
 904         link_set_state(link, LINK_STATE_CONFIGURED);
 905
 906         (void) link_join_netdevs_after_configured(link);
 907
 908         link_dirty(link);
 909 }
 910
 911 static int link_request_set_routing_policy_rule(Link *link) {
 912         RoutingPolicyRule *rule, *rrule = NULL;
 913         int r;
 914
 915         assert(link);
 916         assert(link->network);
 917
 918         link->routing_policy_rules_configured = false;
 919
 920         LIST_FOREACH(rules, rule, link->network->rules) {
 921                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 922                 if (r >= 0) {
 923                         if (r == 0)
 924                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 925                         continue;
 926                 }
 927
 928                 r = routing_policy_rule_configure(rule, link, NULL);
 929                 if (r < 0)
 930                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 931                 if (r > 0)
 932                         link->routing_policy_rule_messages++;
 933         }
 934
 935         routing_policy_rule_purge(link->manager, link);
 936         if (link->routing_policy_rule_messages == 0)
 937                 link->routing_policy_rules_configured = true;
 938         else {
 939                 log_link_debug(link, "Setting routing policy rules");
 940                 link_set_state(link, LINK_STATE_CONFIGURING);
 941         }
 942
 943         return 0;
 944 }
 945
 946 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 947         int r;
 948
 949         assert(link);
 950         assert(link->nexthop_messages > 0);
 951         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 952                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 953
 954         link->nexthop_messages--;
 955
 956         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 957                 return 1;
 958
 959         r = sd_netlink_message_get_errno(m);
 960         if (r < 0 && r != -EEXIST) {
 961                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 962                 link_enter_failed(link);
 963                 return 1;
 964         }
 965
 966         if (link->nexthop_messages == 0) {
 967                 log_link_debug(link, "Nexthop set");
 968                 link->static_nexthops_configured = true;
 969                 link_check_ready(link);
 970         }
 971
 972         return 1;
 973 }
 974
 975 static int link_request_set_nexthop(Link *link) {
 976         NextHop *nh;
 977         int r;
 978
 979         link->static_nexthops_configured = false;
 980
 981         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 982                 r = nexthop_configure(nh, link, nexthop_handler);
 983                 if (r < 0)
 984                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 985                 if (r > 0)
 986                         link->nexthop_messages++;
 987         }
 988
 989         if (link->nexthop_messages == 0) {
 990                 link->static_nexthops_configured = true;
 991                 link_check_ready(link);
 992         } else {
 993                 log_link_debug(link, "Setting nexthop");
 994                 link_set_state(link, LINK_STATE_CONFIGURING);
 995         }
 996
 997         return 1;
 998 }
 999
1000 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1001         int r;
1002
1003         assert(link);
1004         assert(link->route_messages > 0);
1005         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1006                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1007
1008         link->route_messages--;
1009
1010         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1011                 return 1;
1012
1013         r = sd_netlink_message_get_errno(m);
1014         if (r < 0 && r != -EEXIST) {
1015                 log_link_message_warning_errno(link, m, r, "Could not set route");
1016                 link_enter_failed(link);
1017                 return 1;
1018         }
1019
1020         if (link->route_messages == 0) {
1021                 log_link_debug(link, "Routes set");
1022                 link->static_routes_configured = true;
1023                 link_request_set_nexthop(link);
1024         }
1025
1026         return 1;
1027 }
1028
1029 int link_request_set_routes(Link *link) {
1030         enum {
1031                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1032                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1033                 _PHASE_MAX
1034         } phase;
1035         Route *rt;
1036         int r;
1037
1038         assert(link);
1039         assert(link->network);
1040         assert(link->addresses_configured);
1041         assert(link->address_messages == 0);
1042         assert(link->state != _LINK_STATE_INVALID);
1043
1044         link->static_routes_configured = false;
1045
1046         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1047                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1048                  * the addresses now, let's not configure the routes either. */
1049                 return 0;
1050
1051         r = link_request_set_routing_policy_rule(link);
1052         if (r < 0)
1053                 return r;
1054
1055         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1056         for (phase = 0; phase < _PHASE_MAX; phase++)
1057                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1058                         if (rt->gateway_from_dhcp)
1059                                 continue;
1060
1061                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1062                                 continue;
1063
1064                         r = route_configure(rt, link, route_handler, NULL);
1065                         if (r < 0)
1066                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1067                         if (r > 0)
1068                                 link->route_messages++;
1069                 }
1070
1071         if (link->route_messages == 0) {
1072                 link->static_routes_configured = true;
1073                 link_request_set_nexthop(link);
1074         } else {
1075                 log_link_debug(link, "Setting routes");
1076                 link_set_state(link, LINK_STATE_CONFIGURING);
1077         }
1078
1079         return 0;
1080 }
1081
1082 void link_check_ready(Link *link) {
1083         Address *a;
1084         Iterator i;
1085         int r;
1086
1087         assert(link);
1088
1089         if (link->state == LINK_STATE_CONFIGURED)
1090                 return;
1091
1092         if (link->state != LINK_STATE_CONFIGURING) {
1093                 log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
1094                 return;
1095         }
1096
1097         if (!link->network)
1098                 return;
1099
1100         if (!link->addresses_configured) {
1101                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1102                 return;
1103         }
1104
1105         if (!link->neighbors_configured) {
1106                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1107                 return;
1108         }
1109
1110         SET_FOREACH(a, link->addresses, i)
1111                 if (!address_is_ready(a)) {
1112                         _cleanup_free_ char *str = NULL;
1113
1114                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1115                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1116                         return;
1117                 }
1118
1119         if (!link->addresses_ready) {
1120                 link->addresses_ready = true;
1121                 r = link_request_set_routes(link);
1122                 if (r < 0)
1123                         link_enter_failed(link);
1124                 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1125                 return;
1126         }
1127
1128         if (!link->static_routes_configured) {
1129                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1130                 return;
1131         }
1132
1133         if (!link->static_nexthops_configured) {
1134                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1135                 return;
1136         }
1137
1138         if (!link->routing_policy_rules_configured) {
1139                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1140                 return;
1141         }
1142
1143         if (!link->tc_configured) {
1144                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1145                 return;
1146         }
1147
1148         if (!link->sr_iov_configured) {
1149                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1150                 return;
1151         }
1152
1153         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1154
1155                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address) {
1156                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1157                         return;
1158                 }
1159
1160                 if (link_ipv6ll_enabled(link) &&
1161                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1162                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1163                         return;
1164                 }
1165
1166                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) && set_isempty(link->addresses)) {
1167                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no address is assigned yet.", __func__);
1168                         return;
1169                 }
1170
1171                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || dhcp6_get_prefix_delegation(link) || link_ipv6_accept_ra_enabled(link)) {
1172                         if (!link->dhcp4_configured &&
1173                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1174                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1175                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1176                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address)) {
1177                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1178                                  * an IPv4ll fallback address must be configured. */
1179                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1180                                 return;
1181                         }
1182
1183                         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",
1184                                        __func__,
1185                                        yes_no(link->dhcp4_configured),
1186                                        yes_no(link->dhcp6_address_configured),
1187                                        yes_no(link->dhcp6_route_configured),
1188                                        yes_no(link->dhcp6_pd_address_configured),
1189                                        yes_no(link->dhcp6_pd_route_configured),
1190                                        yes_no(link->ndisc_addresses_configured),
1191                                        yes_no(link->ndisc_routes_configured));
1192                 }
1193         }
1194
1195         link_enter_configured(link);
1196
1197         return;
1198 }
1199
1200 static int link_request_set_neighbors(Link *link) {
1201         Neighbor *neighbor;
1202         int r;
1203
1204         assert(link);
1205         assert(link->network);
1206         assert(link->state != _LINK_STATE_INVALID);
1207
1208         link->neighbors_configured = false;
1209
1210         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1211                 r = neighbor_configure(neighbor, link, NULL);
1212                 if (r < 0)
1213                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1214         }
1215
1216         if (link->neighbor_messages == 0) {
1217                 link->neighbors_configured = true;
1218                 link_check_ready(link);
1219         } else {
1220                 log_link_debug(link, "Setting neighbors");
1221                 link_set_state(link, LINK_STATE_CONFIGURING);
1222         }
1223
1224         return 0;
1225 }
1226
1227 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1228         int r;
1229
1230         assert(rtnl);
1231         assert(m);
1232         assert(link);
1233         assert(link->ifname);
1234         assert(link->address_messages > 0);
1235         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1236                LINK_STATE_FAILED, LINK_STATE_LINGER));
1237
1238         link->address_messages--;
1239
1240         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1241                 return 1;
1242
1243         r = sd_netlink_message_get_errno(m);
1244         if (r < 0 && r != -EEXIST) {
1245                 log_link_message_warning_errno(link, m, r, "Could not set address");
1246                 link_enter_failed(link);
1247                 return 1;
1248         } else if (r >= 0)
1249                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1250
1251         if (link->address_messages == 0) {
1252                 log_link_debug(link, "Addresses set");
1253                 link->addresses_configured = true;
1254                 link_check_ready(link);
1255         }
1256
1257         return 1;
1258 }
1259
1260 static int link_set_bridge_fdb(Link *link) {
1261         FdbEntry *fdb_entry;
1262         int r;
1263
1264         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1265                 r = fdb_entry_configure(link, fdb_entry);
1266                 if (r < 0)
1267                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1268         }
1269
1270         return 0;
1271 }
1272
1273 static int link_request_set_addresses(Link *link) {
1274         AddressLabel *label;
1275         Address *ad;
1276         Prefix *p;
1277         int r;
1278
1279         assert(link);
1280         assert(link->network);
1281         assert(link->state != _LINK_STATE_INVALID);
1282
1283         /* Reset all *_configured flags we are configuring. */
1284         link->addresses_configured = false;
1285         link->addresses_ready = false;
1286         link->neighbors_configured = false;
1287         link->static_routes_configured = false;
1288         link->static_nexthops_configured = false;
1289         link->routing_policy_rules_configured = false;
1290
1291         r = link_set_bridge_fdb(link);
1292         if (r < 0)
1293                 return r;
1294
1295         r = link_request_set_neighbors(link);
1296         if (r < 0)
1297                 return r;
1298
1299         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1300                 bool update;
1301
1302                 if (ad->family == AF_INET6 && !in_addr_is_null(ad->family, &ad->in_addr_peer))
1303                         update = address_get(link, ad->family, &ad->in_addr_peer, ad->prefixlen, NULL) > 0;
1304                 else
1305                         update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1306
1307                 r = address_configure(ad, link, address_handler, update, NULL);
1308                 if (r < 0)
1309                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1310                 if (r > 0)
1311                         link->address_messages++;
1312         }
1313
1314         if (IN_SET(link->network->router_prefix_delegation,
1315                    RADV_PREFIX_DELEGATION_STATIC,
1316                    RADV_PREFIX_DELEGATION_BOTH))
1317                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1318                         _cleanup_(address_freep) Address *address = NULL;
1319
1320                         if (!p->assign)
1321                                 continue;
1322
1323                         r = address_new(&address);
1324                         if (r < 0)
1325                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1326
1327                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1328                         if (r < 0)
1329                                 return r;
1330
1331                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1332                         if (r < 0)
1333                                 return r;
1334
1335                         address->family = AF_INET6;
1336                         r = address_configure(address, link, address_handler, true, NULL);
1337                         if (r < 0)
1338                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1339                         if (r > 0)
1340                                 link->address_messages++;
1341                 }
1342
1343         LIST_FOREACH(labels, label, link->network->address_labels) {
1344                 r = address_label_configure(label, link, NULL, false);
1345                 if (r < 0)
1346                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1347
1348                 link->address_label_messages++;
1349         }
1350
1351         /* now that we can figure out a default address for the dhcp server,
1352            start it */
1353         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1354                 r = dhcp4_server_configure(link);
1355                 if (r < 0)
1356                         return r;
1357                 log_link_debug(link, "Offering DHCPv4 leases");
1358         }
1359
1360         if (link->address_messages == 0) {
1361                 link->addresses_configured = true;
1362                 link_check_ready(link);
1363         } else {
1364                 log_link_debug(link, "Setting addresses");
1365                 link_set_state(link, LINK_STATE_CONFIGURING);
1366         }
1367
1368         return 0;
1369 }
1370
1371 static int link_set_bridge_vlan(Link *link) {
1372         int r;
1373
1374         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1375         if (r < 0)
1376                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1377
1378         return r;
1379 }
1380
1381 static int link_set_proxy_arp(Link *link) {
1382         int r;
1383
1384         if (!link_proxy_arp_enabled(link))
1385                 return 0;
1386
1387         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1388         if (r < 0)
1389                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1390
1391         return 0;
1392 }
1393
1394 static int link_configure_continue(Link *link);
1395
1396 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1397         int r;
1398
1399         assert(m);
1400         assert(link);
1401         assert(link->ifname);
1402
1403         link->setting_mtu = false;
1404
1405         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1406                 return 1;
1407
1408         r = sd_netlink_message_get_errno(m);
1409         if (r < 0)
1410                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1411         else
1412                 log_link_debug(link, "Setting MTU done.");
1413
1414         if (link->state == LINK_STATE_INITIALIZED) {
1415                 r = link_configure_continue(link);
1416                 if (r < 0)
1417                         link_enter_failed(link);
1418         }
1419
1420         return 1;
1421 }
1422
1423 int link_set_mtu(Link *link, uint32_t mtu) {
1424         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1425         int r;
1426
1427         assert(link);
1428         assert(link->manager);
1429         assert(link->manager->rtnl);
1430
1431         if (mtu == 0 || link->setting_mtu)
1432                 return 0;
1433
1434         if (link->mtu == mtu)
1435                 return 0;
1436
1437         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1438
1439         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1440         if (r < 0)
1441                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1442
1443         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1444          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1445         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1446
1447                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1448                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1449
1450                 mtu = IPV6_MIN_MTU;
1451         }
1452
1453         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1454         if (r < 0)
1455                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1456
1457         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1458                                link_netlink_destroy_callback, link);
1459         if (r < 0)
1460                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1461
1462         link_ref(link);
1463         link->setting_mtu = true;
1464
1465         return 0;
1466 }
1467
1468 static bool link_reduces_vlan_mtu(Link *link) {
1469         /* See netif_reduces_vlan_mtu() in kernel. */
1470         return streq_ptr(link->kind, "macsec");
1471 }
1472
1473 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1474         uint32_t mtu = 0;
1475         NetDev *dev;
1476         Iterator i;
1477
1478         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1479                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1480                         /* See vlan_dev_change_mtu() in kernel. */
1481                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1482
1483                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1484                         /* See macvlan_change_mtu() in kernel. */
1485                         mtu = dev->mtu;
1486
1487         return mtu;
1488 }
1489
1490 static int link_configure_mtu(Link *link) {
1491         uint32_t mtu;
1492
1493         assert(link);
1494         assert(link->network);
1495
1496         if (link->network->mtu > 0)
1497                 return link_set_mtu(link, link->network->mtu);
1498
1499         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1500         if (link->mtu >= mtu)
1501                 return 0;
1502
1503         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1504                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1505                         link->mtu, mtu);
1506
1507         return link_set_mtu(link, mtu);
1508 }
1509
1510 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1511         int r;
1512
1513         assert(m);
1514         assert(link);
1515         assert(link->ifname);
1516
1517         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1518                 return 1;
1519
1520         r = sd_netlink_message_get_errno(m);
1521         if (r < 0)
1522                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1523
1524         return 1;
1525 }
1526
1527 static int link_set_flags(Link *link) {
1528         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1529         unsigned ifi_change = 0;
1530         unsigned ifi_flags = 0;
1531         int r;
1532
1533         assert(link);
1534         assert(link->manager);
1535         assert(link->manager->rtnl);
1536
1537         if (link->flags & IFF_LOOPBACK)
1538                 return 0;
1539
1540         if (!link->network)
1541                 return 0;
1542
1543         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1544                 return 0;
1545
1546         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1547         if (r < 0)
1548                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1549
1550         if (link->network->arp >= 0) {
1551                 ifi_change |= IFF_NOARP;
1552                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1553         }
1554
1555         if (link->network->multicast >= 0) {
1556                 ifi_change |= IFF_MULTICAST;
1557                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1558         }
1559
1560         if (link->network->allmulticast >= 0) {
1561                 ifi_change |= IFF_ALLMULTI;
1562                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1563         }
1564
1565         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1566         if (r < 0)
1567                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1568
1569         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1570                                link_netlink_destroy_callback, link);
1571         if (r < 0)
1572                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1573
1574         link_ref(link);
1575
1576         return 0;
1577 }
1578
1579 static int link_acquire_ipv6_conf(Link *link) {
1580         int r;
1581
1582         assert(link);
1583
1584         if (link_ipv6_accept_ra_enabled(link)) {
1585                 assert(link->ndisc);
1586
1587                 log_link_debug(link, "Discovering IPv6 routers");
1588
1589                 r = sd_ndisc_start(link->ndisc);
1590                 if (r < 0 && r != -EBUSY)
1591                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1592         }
1593
1594         if (link_radv_enabled(link)) {
1595                 assert(link->radv);
1596                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1597
1598                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1599
1600                 r = radv_emit_dns(link);
1601                 if (r < 0)
1602                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1603
1604                 r = sd_radv_start(link->radv);
1605                 if (r < 0 && r != -EBUSY)
1606                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1607         }
1608
1609         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1610                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1611                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1612                 assert(link->dhcp6_client);
1613                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1614
1615                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1616                 if (r < 0 && r != -EBUSY)
1617                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1618                 else
1619                         log_link_debug(link, "Acquiring DHCPv6 lease");
1620         }
1621
1622         (void) dhcp6_request_prefix_delegation(link);
1623
1624         return 0;
1625 }
1626
1627 static int link_acquire_ipv4_conf(Link *link) {
1628         int r;
1629
1630         assert(link);
1631         assert(link->manager);
1632         assert(link->manager->event);
1633
1634         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1635                 assert(link->ipv4ll);
1636
1637                 log_link_debug(link, "Acquiring IPv4 link-local address");
1638
1639                 r = sd_ipv4ll_start(link->ipv4ll);
1640                 if (r < 0)
1641                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1642         }
1643
1644         if (link_dhcp4_enabled(link)) {
1645                 assert(link->dhcp_client);
1646
1647                 log_link_debug(link, "Acquiring DHCPv4 lease");
1648
1649                 r = sd_dhcp_client_start(link->dhcp_client);
1650                 if (r < 0)
1651                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1652         }
1653
1654         return 0;
1655 }
1656
1657 static int link_acquire_conf(Link *link) {
1658         int r;
1659
1660         assert(link);
1661
1662         r = link_acquire_ipv4_conf(link);
1663         if (r < 0)
1664                 return r;
1665
1666         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1667                 r = link_acquire_ipv6_conf(link);
1668                 if (r < 0)
1669                         return r;
1670         }
1671
1672         if (link_lldp_emit_enabled(link)) {
1673                 r = link_lldp_emit_start(link);
1674                 if (r < 0)
1675                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1676         }
1677
1678         return 0;
1679 }
1680
1681 bool link_has_carrier(Link *link) {
1682         /* see Documentation/networking/operstates.txt in the kernel sources */
1683
1684         if (link->kernel_operstate == IF_OPER_UP)
1685                 return true;
1686
1687         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1688                 /* operstate may not be implemented, so fall back to flags */
1689                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1690                     !FLAGS_SET(link->flags, IFF_DORMANT))
1691                         return true;
1692
1693         return false;
1694 }
1695
1696 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1697         int r;
1698
1699         assert(link);
1700
1701         link->setting_genmode = false;
1702
1703         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1704                 return 1;
1705
1706         r = sd_netlink_message_get_errno(m);
1707         if (r < 0)
1708                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1709         else
1710                 log_link_debug(link, "Setting address genmode done.");
1711
1712         if (link->state == LINK_STATE_INITIALIZED) {
1713                 r = link_configure_continue(link);
1714                 if (r < 0)
1715                         link_enter_failed(link);
1716         }
1717
1718         return 1;
1719 }
1720
1721 static int link_configure_addrgen_mode(Link *link) {
1722         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1723         uint8_t ipv6ll_mode;
1724         int r;
1725
1726         assert(link);
1727         assert(link->network);
1728         assert(link->manager);
1729         assert(link->manager->rtnl);
1730
1731         if (!socket_ipv6_is_supported() || link->setting_genmode)
1732                 return 0;
1733
1734         log_link_debug(link, "Setting address genmode for link");
1735
1736         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1737         if (r < 0)
1738                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1739
1740         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1741         if (r < 0)
1742                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1743
1744         r = sd_netlink_message_open_container(req, AF_INET6);
1745         if (r < 0)
1746                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1747
1748         if (!link_ipv6ll_enabled(link))
1749                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1750         else if (link->network->ipv6ll_address_gen_mode < 0) {
1751                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1752                 if (r < 0) {
1753                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1754                          * reading the file fails with EIO. */
1755                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1756
1757                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1758                 } else
1759                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1760         } else
1761                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1762
1763         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1764         if (r < 0)
1765                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1766
1767         r = sd_netlink_message_close_container(req);
1768         if (r < 0)
1769                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1770
1771         r = sd_netlink_message_close_container(req);
1772         if (r < 0)
1773                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1774
1775         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1776                                link_netlink_destroy_callback, link);
1777         if (r < 0)
1778                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1779
1780         link_ref(link);
1781         link->setting_genmode = true;
1782
1783         return 0;
1784 }
1785
1786 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1787         int r;
1788
1789         assert(link);
1790
1791         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1792                 return 1;
1793
1794         r = sd_netlink_message_get_errno(m);
1795         if (r < 0)
1796                 /* we warn but don't fail the link, as it may be brought up later */
1797                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1798
1799         return 1;
1800 }
1801
1802 static int link_up(Link *link) {
1803         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1804         int r;
1805
1806         assert(link);
1807         assert(link->network);
1808         assert(link->manager);
1809         assert(link->manager->rtnl);
1810
1811         log_link_debug(link, "Bringing link up");
1812
1813         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1814         if (r < 0)
1815                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1816
1817         /* set it free if not enslaved with networkd */
1818         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1819                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1820                 if (r < 0)
1821                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1822         }
1823
1824         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1825         if (r < 0)
1826                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1827
1828         if (link->network->mac) {
1829                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1830                 if (r < 0)
1831                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1832         }
1833
1834         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1835                                link_netlink_destroy_callback, link);
1836         if (r < 0)
1837                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1838
1839         link_ref(link);
1840
1841         return 0;
1842 }
1843
1844 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1845         int r;
1846
1847         assert(link);
1848
1849         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1850                 return 1;
1851
1852         r = sd_netlink_message_get_errno(m);
1853         if (r < 0)
1854                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1855
1856         return 1;
1857 }
1858
1859 int link_down(Link *link, link_netlink_message_handler_t callback) {
1860         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1861         int r;
1862
1863         assert(link);
1864         assert(link->manager);
1865         assert(link->manager->rtnl);
1866
1867         log_link_debug(link, "Bringing link down");
1868
1869         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1870                                      RTM_SETLINK, link->ifindex);
1871         if (r < 0)
1872                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1873
1874         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1875         if (r < 0)
1876                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1877
1878         r = netlink_call_async(link->manager->rtnl, NULL, req,
1879                                callback ?: link_down_handler,
1880                                link_netlink_destroy_callback, link);
1881         if (r < 0)
1882                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1883
1884         link_ref(link);
1885
1886         return 0;
1887 }
1888
1889 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1890         int r;
1891
1892         assert(link);
1893
1894         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1895                 return 1;
1896
1897         r = sd_netlink_message_get_errno(m);
1898         if (r < 0)
1899                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1900
1901         return 1;
1902 }
1903
1904 static int link_set_group(Link *link) {
1905         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1906         int r;
1907
1908         assert(link);
1909         assert(link->network);
1910         assert(link->manager);
1911         assert(link->manager->rtnl);
1912
1913         if (link->network->group <= 0)
1914                 return 0;
1915
1916         log_link_debug(link, "Setting group");
1917
1918         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1919         if (r < 0)
1920                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1921
1922         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1923         if (r < 0)
1924                 return log_link_error_errno(link, r, "Could not set link group: %m");
1925
1926         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1927                                link_netlink_destroy_callback, link);
1928         if (r < 0)
1929                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1930
1931         link_ref(link);
1932
1933         return 0;
1934 }
1935
1936 static int link_handle_bound_to_list(Link *link) {
1937         Link *l;
1938         Iterator i;
1939         int r;
1940         bool required_up = false;
1941         bool link_is_up = false;
1942
1943         assert(link);
1944
1945         if (hashmap_isempty(link->bound_to_links))
1946                 return 0;
1947
1948         if (link->flags & IFF_UP)
1949                 link_is_up = true;
1950
1951         HASHMAP_FOREACH (l, link->bound_to_links, i)
1952                 if (link_has_carrier(l)) {
1953                         required_up = true;
1954                         break;
1955                 }
1956
1957         if (!required_up && link_is_up) {
1958                 r = link_down(link, NULL);
1959                 if (r < 0)
1960                         return r;
1961         } else if (required_up && !link_is_up) {
1962                 r = link_up(link);
1963                 if (r < 0)
1964                         return r;
1965         }
1966
1967         return 0;
1968 }
1969
1970 static int link_handle_bound_by_list(Link *link) {
1971         Iterator i;
1972         Link *l;
1973         int r;
1974
1975         assert(link);
1976
1977         if (hashmap_isempty(link->bound_by_links))
1978                 return 0;
1979
1980         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1981                 r = link_handle_bound_to_list(l);
1982                 if (r < 0)
1983                         return r;
1984         }
1985
1986         return 0;
1987 }
1988
1989 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1990         int r;
1991
1992         assert(link);
1993         assert(carrier);
1994
1995         if (link == carrier)
1996                 return 0;
1997
1998         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1999                 return 0;
2000
2001         r = hashmap_ensure_allocated(h, NULL);
2002         if (r < 0)
2003                 return r;
2004
2005         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2006         if (r < 0)
2007                 return r;
2008
2009         return 0;
2010 }
2011
2012 static int link_new_bound_by_list(Link *link) {
2013         Manager *m;
2014         Link *carrier;
2015         Iterator i;
2016         int r;
2017         bool list_updated = false;
2018
2019         assert(link);
2020         assert(link->manager);
2021
2022         m = link->manager;
2023
2024         HASHMAP_FOREACH(carrier, m->links, i) {
2025                 if (!carrier->network)
2026                         continue;
2027
2028                 if (strv_isempty(carrier->network->bind_carrier))
2029                         continue;
2030
2031                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2032                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2033                         if (r < 0)
2034                                 return r;
2035
2036                         list_updated = true;
2037                 }
2038         }
2039
2040         if (list_updated)
2041                 link_dirty(link);
2042
2043         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2044                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2045                 if (r < 0)
2046                         return r;
2047
2048                 link_dirty(carrier);
2049         }
2050
2051         return 0;
2052 }
2053
2054 static int link_new_bound_to_list(Link *link) {
2055         Manager *m;
2056         Link *carrier;
2057         Iterator i;
2058         int r;
2059         bool list_updated = false;
2060
2061         assert(link);
2062         assert(link->manager);
2063
2064         if (!link->network)
2065                 return 0;
2066
2067         if (strv_isempty(link->network->bind_carrier))
2068                 return 0;
2069
2070         m = link->manager;
2071
2072         HASHMAP_FOREACH (carrier, m->links, i) {
2073                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2074                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2075                         if (r < 0)
2076                                 return r;
2077
2078                         list_updated = true;
2079                 }
2080         }
2081
2082         if (list_updated)
2083                 link_dirty(link);
2084
2085         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2086                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2087                 if (r < 0)
2088                         return r;
2089
2090                 link_dirty(carrier);
2091         }
2092
2093         return 0;
2094 }
2095
2096 static int link_new_carrier_maps(Link *link) {
2097         int r;
2098
2099         r = link_new_bound_by_list(link);
2100         if (r < 0)
2101                 return r;
2102
2103         r = link_handle_bound_by_list(link);
2104         if (r < 0)
2105                 return r;
2106
2107         r = link_new_bound_to_list(link);
2108         if (r < 0)
2109                 return r;
2110
2111         r = link_handle_bound_to_list(link);
2112         if (r < 0)
2113                 return r;
2114
2115         return 0;
2116 }
2117
2118 static void link_free_bound_to_list(Link *link) {
2119         Link *bound_to;
2120         Iterator i;
2121
2122         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2123                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2124
2125                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2126                         link_dirty(bound_to);
2127         }
2128
2129         return;
2130 }
2131
2132 static void link_free_bound_by_list(Link *link) {
2133         Link *bound_by;
2134         Iterator i;
2135
2136         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2137                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2138
2139                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2140                         link_dirty(bound_by);
2141                         link_handle_bound_to_list(bound_by);
2142                 }
2143         }
2144
2145         return;
2146 }
2147
2148 static void link_free_carrier_maps(Link *link) {
2149         bool list_updated = false;
2150
2151         assert(link);
2152
2153         if (!hashmap_isempty(link->bound_to_links)) {
2154                 link_free_bound_to_list(link);
2155                 list_updated = true;
2156         }
2157
2158         if (!hashmap_isempty(link->bound_by_links)) {
2159                 link_free_bound_by_list(link);
2160                 list_updated = true;
2161         }
2162
2163         if (list_updated)
2164                 link_dirty(link);
2165
2166         return;
2167 }
2168
2169 static int link_append_to_master(Link *link, NetDev *netdev) {
2170         Link *master;
2171         int r;
2172
2173         assert(link);
2174         assert(netdev);
2175
2176         r = link_get(link->manager, netdev->ifindex, &master);
2177         if (r < 0)
2178                 return r;
2179
2180         r = set_ensure_put(&master->slaves, NULL, link);
2181         if (r <= 0)
2182                 return r;
2183
2184         link_ref(link);
2185         return 0;
2186 }
2187
2188 static void link_drop_from_master(Link *link, NetDev *netdev) {
2189         Link *master;
2190
2191         assert(link);
2192
2193         if (!link->manager || !netdev)
2194                 return;
2195
2196         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2197                 return;
2198
2199         link_unref(set_remove(master->slaves, link));
2200 }
2201
2202 static void link_detach_from_manager(Link *link) {
2203         if (!link || !link->manager)
2204                 return;
2205
2206         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2207         link_clean(link);
2208
2209         /* The following must be called at last. */
2210         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2211         link_unref(link);
2212 }
2213
2214 void link_drop(Link *link) {
2215         if (!link || link->state == LINK_STATE_LINGER)
2216                 return;
2217
2218         link_set_state(link, LINK_STATE_LINGER);
2219
2220         link_free_carrier_maps(link);
2221
2222         if (link->network) {
2223                 link_drop_from_master(link, link->network->bridge);
2224                 link_drop_from_master(link, link->network->bond);
2225         }
2226
2227         log_link_debug(link, "Link removed");
2228
2229         (void) unlink(link->state_file);
2230         link_detach_from_manager(link);
2231 }
2232
2233 static int link_joined(Link *link) {
2234         int r;
2235
2236         assert(link);
2237         assert(link->network);
2238
2239         if (!hashmap_isempty(link->bound_to_links)) {
2240                 r = link_handle_bound_to_list(link);
2241                 if (r < 0)
2242                         return r;
2243         } else if (!(link->flags & IFF_UP)) {
2244                 r = link_up(link);
2245                 if (r < 0) {
2246                         link_enter_failed(link);
2247                         return r;
2248                 }
2249         }
2250
2251         if (link->network->bridge) {
2252                 r = link_set_bridge(link);
2253                 if (r < 0)
2254                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2255
2256                 r = link_append_to_master(link, link->network->bridge);
2257                 if (r < 0)
2258                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2259         }
2260
2261         if (link->network->bond) {
2262                 r = link_set_bond(link);
2263                 if (r < 0)
2264                         log_link_error_errno(link, r, "Could not set bond message: %m");
2265
2266                 r = link_append_to_master(link, link->network->bond);
2267                 if (r < 0)
2268                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2269         }
2270
2271         if (link->network->use_br_vlan &&
2272             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2273                 r = link_set_bridge_vlan(link);
2274                 if (r < 0)
2275                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2276         }
2277
2278         /* Skip setting up addresses until it gets carrier,
2279            or it would try to set addresses twice,
2280            which is bad for non-idempotent steps. */
2281         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2282                 return 0;
2283
2284         link_set_state(link, LINK_STATE_CONFIGURING);
2285         return link_request_set_addresses(link);
2286 }
2287
2288 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2289         int r;
2290
2291         assert(link);
2292         assert(link->network);
2293         assert(link->enslaving > 0);
2294
2295         link->enslaving--;
2296
2297         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2298                 return 1;
2299
2300         r = sd_netlink_message_get_errno(m);
2301         if (r < 0 && r != -EEXIST) {
2302                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2303                 link_enter_failed(link);
2304                 return 1;
2305         }
2306
2307         log_link_debug(link, "Joined netdev");
2308
2309         if (link->enslaving == 0) {
2310                 r = link_joined(link);
2311                 if (r < 0)
2312                         link_enter_failed(link);
2313         }
2314
2315         return 1;
2316 }
2317
2318 static int link_enter_join_netdev(Link *link) {
2319         NetDev *netdev;
2320         Iterator i;
2321         int r;
2322
2323         assert(link);
2324         assert(link->network);
2325         assert(link->state == LINK_STATE_INITIALIZED);
2326
2327         link_set_state(link, LINK_STATE_CONFIGURING);
2328
2329         link_dirty(link);
2330         link->enslaving = 0;
2331
2332         if (link->network->bond) {
2333                 if (link->network->bond->state == NETDEV_STATE_READY &&
2334                     link->network->bond->ifindex == link->master_ifindex)
2335                         return link_joined(link);
2336
2337                 log_struct(LOG_DEBUG,
2338                            LOG_LINK_INTERFACE(link),
2339                            LOG_NETDEV_INTERFACE(link->network->bond),
2340                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2341
2342                 link->enslaving++;
2343
2344                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2345                 if (r < 0) {
2346                         log_struct_errno(LOG_WARNING, r,
2347                                          LOG_LINK_INTERFACE(link),
2348                                          LOG_NETDEV_INTERFACE(link->network->bond),
2349                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2350                         link_enter_failed(link);
2351                         return r;
2352                 }
2353         }
2354
2355         if (link->network->bridge) {
2356                 log_struct(LOG_DEBUG,
2357                            LOG_LINK_INTERFACE(link),
2358                            LOG_NETDEV_INTERFACE(link->network->bridge),
2359                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2360
2361                 link->enslaving++;
2362
2363                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2364                 if (r < 0) {
2365                         log_struct_errno(LOG_WARNING, r,
2366                                          LOG_LINK_INTERFACE(link),
2367                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2368                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2369                         link_enter_failed(link);
2370                         return r;
2371                 }
2372         }
2373
2374         if (link->network->vrf) {
2375                 log_struct(LOG_DEBUG,
2376                            LOG_LINK_INTERFACE(link),
2377                            LOG_NETDEV_INTERFACE(link->network->vrf),
2378                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2379
2380                 link->enslaving++;
2381
2382                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2383                 if (r < 0) {
2384                         log_struct_errno(LOG_WARNING, r,
2385                                          LOG_LINK_INTERFACE(link),
2386                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2387                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2388                         link_enter_failed(link);
2389                         return r;
2390                 }
2391         }
2392
2393         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2394
2395                 if (netdev->ifindex > 0)
2396                         /* Assume already enslaved. */
2397                         continue;
2398
2399                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2400                         continue;
2401
2402                 log_struct(LOG_DEBUG,
2403                            LOG_LINK_INTERFACE(link),
2404                            LOG_NETDEV_INTERFACE(netdev),
2405                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2406
2407                 link->enslaving++;
2408
2409                 r = netdev_join(netdev, link, netdev_join_handler);
2410                 if (r < 0) {
2411                         log_struct_errno(LOG_WARNING, r,
2412                                          LOG_LINK_INTERFACE(link),
2413                                          LOG_NETDEV_INTERFACE(netdev),
2414                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2415                         link_enter_failed(link);
2416                         return r;
2417                 }
2418         }
2419
2420         if (link->enslaving == 0)
2421                 return link_joined(link);
2422
2423         return 0;
2424 }
2425
2426 static int link_set_ipv4_forward(Link *link) {
2427         int r;
2428
2429         if (!link_ipv4_forward_enabled(link))
2430                 return 0;
2431
2432         /* We propagate the forwarding flag from one interface to the
2433          * global setting one way. This means: as long as at least one
2434          * interface was configured at any time that had IP forwarding
2435          * enabled the setting will stay on for good. We do this
2436          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2437          * somewhat in sync (see below). */
2438
2439         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2440         if (r < 0)
2441                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2442
2443         return 0;
2444 }
2445
2446 static int link_set_ipv6_forward(Link *link) {
2447         int r;
2448
2449         if (!link_ipv6_forward_enabled(link))
2450                 return 0;
2451
2452         /* On Linux, the IPv6 stack does not know a per-interface
2453          * packet forwarding setting: either packet forwarding is on
2454          * for all, or off for all. We hence don't bother with a
2455          * per-interface setting, but simply propagate the interface
2456          * flag, if it is set, to the global flag, one-way. Note that
2457          * while IPv4 would allow a per-interface flag, we expose the
2458          * same behaviour there and also propagate the setting from
2459          * one to all, to keep things simple (see above). */
2460
2461         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2462         if (r < 0)
2463                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2464
2465         return 0;
2466 }
2467
2468 static int link_set_ipv6_privacy_extensions(Link *link) {
2469         IPv6PrivacyExtensions s;
2470         int r;
2471
2472         s = link_ipv6_privacy_extensions(link);
2473         if (s < 0)
2474                 return 0;
2475
2476         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2477         if (r < 0)
2478                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2479
2480         return 0;
2481 }
2482
2483 static int link_set_ipv6_accept_ra(Link *link) {
2484         int r;
2485
2486         /* Make this a NOP if IPv6 is not available */
2487         if (!socket_ipv6_is_supported())
2488                 return 0;
2489
2490         if (link->flags & IFF_LOOPBACK)
2491                 return 0;
2492
2493         if (!link->network)
2494                 return 0;
2495
2496         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2497         if (r < 0)
2498                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2499
2500         return 0;
2501 }
2502
2503 static int link_set_ipv6_dad_transmits(Link *link) {
2504         int r;
2505
2506         /* Make this a NOP if IPv6 is not available */
2507         if (!socket_ipv6_is_supported())
2508                 return 0;
2509
2510         if (link->flags & IFF_LOOPBACK)
2511                 return 0;
2512
2513         if (!link->network)
2514                 return 0;
2515
2516         if (link->network->ipv6_dad_transmits < 0)
2517                 return 0;
2518
2519         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2520         if (r < 0)
2521                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2522
2523         return 0;
2524 }
2525
2526 static int link_set_ipv6_hop_limit(Link *link) {
2527         int r;
2528
2529         /* Make this a NOP if IPv6 is not available */
2530         if (!socket_ipv6_is_supported())
2531                 return 0;
2532
2533         if (link->flags & IFF_LOOPBACK)
2534                 return 0;
2535
2536         if (!link->network)
2537                 return 0;
2538
2539         if (link->network->ipv6_hop_limit < 0)
2540                 return 0;
2541
2542         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2543         if (r < 0)
2544                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2545
2546         return 0;
2547 }
2548
2549 static int link_set_ipv6_mtu(Link *link) {
2550         int r;
2551
2552         /* Make this a NOP if IPv6 is not available */
2553         if (!socket_ipv6_is_supported())
2554                 return 0;
2555
2556         if (link->flags & IFF_LOOPBACK)
2557                 return 0;
2558
2559         if (link->network->ipv6_mtu == 0)
2560                 return 0;
2561
2562         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2563          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2564         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2565                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2566                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2567         }
2568
2569         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2570         if (r < 0) {
2571                 if (link->mtu < link->network->ipv6_mtu)
2572                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2573                                          link->network->ipv6_mtu, link->mtu);
2574                 else
2575                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2576         }
2577
2578         link->ipv6_mtu_set = true;
2579
2580         return 0;
2581 }
2582
2583 static int link_set_ipv4_accept_local(Link *link) {
2584         int r;
2585
2586         if (link->flags & IFF_LOOPBACK)
2587                 return 0;
2588
2589         if (link->network->ipv4_accept_local < 0)
2590                 return 0;
2591
2592         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2593         if (r < 0)
2594                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2595
2596         return 0;
2597 }
2598
2599 static bool link_is_static_address_configured(Link *link, Address *address) {
2600         Address *net_address;
2601
2602         assert(link);
2603         assert(address);
2604
2605         if (!link->network)
2606                 return false;
2607
2608         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2609                 if (address_equal(net_address, address))
2610                         return true;
2611                 else if (address->family == AF_INET6 && net_address->family == AF_INET6 &&
2612                          in_addr_equal(AF_INET6, &address->in_addr, &net_address->in_addr_peer) > 0)
2613                         return true;
2614
2615         return false;
2616 }
2617
2618 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2619         Neighbor *net_neighbor;
2620
2621         assert(link);
2622         assert(neighbor);
2623
2624         if (!link->network)
2625                 return false;
2626
2627         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2628                 if (neighbor_equal(net_neighbor, neighbor))
2629                         return true;
2630
2631         return false;
2632 }
2633
2634 static bool link_is_static_route_configured(Link *link, Route *route) {
2635         Route *net_route;
2636
2637         assert(link);
2638         assert(route);
2639
2640         if (!link->network)
2641                 return false;
2642
2643         LIST_FOREACH(routes, net_route, link->network->static_routes)
2644                 if (route_equal(net_route, route))
2645                         return true;
2646
2647         return false;
2648 }
2649
2650 static bool link_address_is_dynamic(Link *link, Address *address) {
2651         Route *route;
2652         Iterator i;
2653
2654         assert(link);
2655         assert(address);
2656
2657         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2658                 return true;
2659
2660         /* Even when the address is leased from a DHCP server, networkd assign the address
2661          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2662          * corresponding routes with RTPROT_DHCP. */
2663         SET_FOREACH(route, link->routes_foreign, i) {
2664                 if (route->protocol != RTPROT_DHCP)
2665                         continue;
2666
2667                 if (address->family != route->family)
2668                         continue;
2669
2670                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2671                         return true;
2672         }
2673
2674         return false;
2675 }
2676
2677 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2678         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2679         sd_netlink_message *addr;
2680         int r;
2681
2682         assert(link);
2683         assert(link->manager);
2684         assert(link->manager->rtnl);
2685
2686         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2687         if (r < 0)
2688                 return r;
2689
2690         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2691         if (r < 0)
2692                 return r;
2693
2694         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2695                 unsigned char flags;
2696                 int ifindex;
2697
2698                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2699                 if (r < 0) {
2700                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2701                         continue;
2702                 } else if (link->ifindex != ifindex)
2703                         continue;
2704
2705                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2706                 if (r < 0) {
2707                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2708                         continue;
2709                 } else if (!(flags & IFA_F_TENTATIVE))
2710                         continue;
2711
2712                 log_link_debug(link, "Found tentative ipv6 link-local address");
2713                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2714         }
2715
2716         return 0;
2717 }
2718
2719 static int link_drop_foreign_config(Link *link) {
2720         Address *address;
2721         Neighbor *neighbor;
2722         Route *route;
2723         Iterator i;
2724         int r;
2725
2726         /* The kernel doesn't notify us about tentative addresses;
2727          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2728         if (!link_ipv6ll_enabled(link)) {
2729                 r = link_enumerate_ipv6_tentative_addresses(link);
2730                 if (r < 0)
2731                         return r;
2732         }
2733
2734         SET_FOREACH(address, link->addresses_foreign, i) {
2735                 /* we consider IPv6LL addresses to be managed by the kernel */
2736                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2737                         continue;
2738
2739                 if (link_address_is_dynamic(link, address)) {
2740                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2741                                 continue;
2742                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2743                         continue;
2744
2745                 if (link_is_static_address_configured(link, address)) {
2746                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2747                         if (r < 0)
2748                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2749                 } else {
2750                         r = address_remove(address, link, NULL);
2751                         if (r < 0)
2752                                 return r;
2753                 }
2754         }
2755
2756         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2757                 if (link_is_neighbor_configured(link, neighbor)) {
2758                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2759                         if (r < 0)
2760                                 return r;
2761                 } else {
2762                         r = neighbor_remove(neighbor, link, NULL);
2763                         if (r < 0)
2764                                 return r;
2765                 }
2766         }
2767
2768         SET_FOREACH(route, link->routes_foreign, i) {
2769                 /* do not touch routes managed by the kernel */
2770                 if (route->protocol == RTPROT_KERNEL)
2771                         continue;
2772
2773                 /* do not touch multicast route added by kernel */
2774                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2775                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2776                 if (route->protocol == RTPROT_BOOT &&
2777                     route->family == AF_INET6 &&
2778                     route->dst_prefixlen == 8 &&
2779                     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 }}} }))
2780                         continue;
2781
2782                 if (route->protocol == RTPROT_STATIC && link->network &&
2783                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2784                         continue;
2785
2786                 if (route->protocol == RTPROT_DHCP && link->network &&
2787                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2788                         continue;
2789
2790                 if (link_is_static_route_configured(link, route)) {
2791                         r = route_add(link, route, NULL);
2792                         if (r < 0)
2793                                 return r;
2794                 } else {
2795                         r = route_remove(route, link, NULL);
2796                         if (r < 0)
2797                                 return r;
2798                 }
2799         }
2800
2801         return 0;
2802 }
2803
2804 static int link_drop_config(Link *link) {
2805         Address *address, *pool_address;
2806         Neighbor *neighbor;
2807         Route *route;
2808         Iterator i;
2809         int r;
2810
2811         SET_FOREACH(address, link->addresses, i) {
2812                 /* we consider IPv6LL addresses to be managed by the kernel */
2813                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2814                         continue;
2815
2816                 r = address_remove(address, link, NULL);
2817                 if (r < 0)
2818                         return r;
2819
2820                 /* If this address came from an address pool, clean up the pool */
2821                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2822                         if (address_equal(address, pool_address)) {
2823                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2824                                 address_free(pool_address);
2825                                 break;
2826                         }
2827                 }
2828         }
2829
2830         SET_FOREACH(neighbor, link->neighbors, i) {
2831                 r = neighbor_remove(neighbor, link, NULL);
2832                 if (r < 0)
2833                         return r;
2834         }
2835
2836         SET_FOREACH(route, link->routes, i) {
2837                 /* do not touch routes managed by the kernel */
2838                 if (route->protocol == RTPROT_KERNEL)
2839                         continue;
2840
2841                 r = route_remove(route, link, NULL);
2842                 if (r < 0)
2843                         return r;
2844         }
2845
2846         ndisc_flush(link);
2847
2848         return 0;
2849 }
2850
2851 static int link_configure_ipv4_dad(Link *link) {
2852         Address *address;
2853         int r;
2854
2855         assert(link);
2856         assert(link->network);
2857
2858         LIST_FOREACH(addresses, address, link->network->static_addresses)
2859                 if (address->family == AF_INET &&
2860                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2861                         r = configure_ipv4_duplicate_address_detection(link, address);
2862                         if (r < 0)
2863                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2864                 }
2865
2866         return 0;
2867 }
2868
2869 static int link_configure_traffic_control(Link *link) {
2870         TrafficControl *tc;
2871         Iterator i;
2872         int r;
2873
2874         link->tc_configured = false;
2875         link->tc_messages = 0;
2876
2877         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2878                 r = traffic_control_configure(link, tc);
2879                 if (r < 0)
2880                         return r;
2881         }
2882
2883         if (link->tc_messages == 0)
2884                 link->tc_configured = true;
2885         else
2886                 log_link_debug(link, "Configuring traffic control");
2887
2888         return 0;
2889 }
2890
2891 static int link_configure_sr_iov(Link *link) {
2892         SRIOV *sr_iov;
2893         Iterator i;
2894         int r;
2895
2896         link->sr_iov_configured = false;
2897         link->sr_iov_messages = 0;
2898
2899         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2900                 r = sr_iov_configure(link, sr_iov);
2901                 if (r < 0)
2902                         return r;
2903         }
2904
2905         if (link->sr_iov_messages == 0)
2906                 link->sr_iov_configured = true;
2907         else
2908                 log_link_debug(link, "Configuring SR-IOV");
2909
2910         return 0;
2911 }
2912
2913 static int link_configure(Link *link) {
2914         int r;
2915
2916         assert(link);
2917         assert(link->network);
2918         assert(link->state == LINK_STATE_INITIALIZED);
2919
2920         r = link_configure_traffic_control(link);
2921         if (r < 0)
2922                 return r;
2923
2924         r = link_configure_sr_iov(link);
2925         if (r < 0)
2926                 return r;
2927
2928         if (link->iftype == ARPHRD_CAN)
2929                 return link_configure_can(link);
2930
2931         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2932          * for this interface, then enable IPv6 */
2933         (void) link_update_ipv6_sysctl(link);
2934
2935         r = link_set_proxy_arp(link);
2936         if (r < 0)
2937                return r;
2938
2939         r = ipv6_proxy_ndp_addresses_configure(link);
2940         if (r < 0)
2941                 return r;
2942
2943         r = link_set_ipv4_forward(link);
2944         if (r < 0)
2945                 return r;
2946
2947         r = link_set_ipv6_forward(link);
2948         if (r < 0)
2949                 return r;
2950
2951         r = link_set_ipv6_privacy_extensions(link);
2952         if (r < 0)
2953                 return r;
2954
2955         r = link_set_ipv6_accept_ra(link);
2956         if (r < 0)
2957                 return r;
2958
2959         r = link_set_ipv6_dad_transmits(link);
2960         if (r < 0)
2961                 return r;
2962
2963         r = link_set_ipv6_hop_limit(link);
2964         if (r < 0)
2965                 return r;
2966
2967         r = link_set_ipv4_accept_local(link);
2968         if (r < 0)
2969                 return r;
2970
2971         r = link_set_flags(link);
2972         if (r < 0)
2973                 return r;
2974
2975         r = link_set_group(link);
2976         if (r < 0)
2977                 return r;
2978
2979         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2980                 r = ipv4ll_configure(link);
2981                 if (r < 0)
2982                         return r;
2983         }
2984
2985         if (link_dhcp4_enabled(link)) {
2986                 r = dhcp4_set_promote_secondaries(link);
2987                 if (r < 0)
2988                         return r;
2989
2990                 r = dhcp4_configure(link);
2991                 if (r < 0)
2992                         return r;
2993         }
2994
2995         if (link_dhcp4_server_enabled(link)) {
2996                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2997                 if (r < 0)
2998                         return r;
2999
3000                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3001                 if (r < 0)
3002                         return r;
3003         }
3004
3005         if (link_dhcp6_enabled(link) ||
3006             link_ipv6_accept_ra_enabled(link)) {
3007                 r = dhcp6_configure(link);
3008                 if (r < 0)
3009                         return r;
3010         }
3011
3012         if (link_ipv6_accept_ra_enabled(link)) {
3013                 r = ndisc_configure(link);
3014                 if (r < 0)
3015                         return r;
3016         }
3017
3018         if (link_radv_enabled(link)) {
3019                 r = radv_configure(link);
3020                 if (r < 0)
3021                         return r;
3022         }
3023
3024         if (link_lldp_rx_enabled(link)) {
3025                 r = link_lldp_rx_configure(link);
3026                 if (r < 0)
3027                         return r;
3028         }
3029
3030         r = link_configure_mtu(link);
3031         if (r < 0)
3032                 return r;
3033
3034         r = link_configure_addrgen_mode(link);
3035         if (r < 0)
3036                 return r;
3037
3038         r = link_configure_ipv4_dad(link);
3039         if (r < 0)
3040                 return r;
3041
3042         return link_configure_continue(link);
3043 }
3044
3045 /* The configuration continues in this separate function, instead of
3046  * including this in the above link_configure() function, for two
3047  * reasons:
3048  * 1) some devices reset the link when the mtu is set, which caused
3049  *    an infinite loop here in networkd; see:
3050  *    https://github.com/systemd/systemd/issues/6593
3051  *    https://github.com/systemd/systemd/issues/9831
3052  * 2) if ipv6ll is disabled, then bringing the interface up must be
3053  *    delayed until after we get confirmation from the kernel that
3054  *    the addr_gen_mode parameter has been set (via netlink), see:
3055  *    https://github.com/systemd/systemd/issues/13882
3056  */
3057 static int link_configure_continue(Link *link) {
3058         int r;
3059
3060         assert(link);
3061         assert(link->network);
3062         assert(link->state == LINK_STATE_INITIALIZED);
3063
3064         if (link->setting_mtu || link->setting_genmode)
3065                 return 0;
3066
3067         /* Drop foreign config, but ignore loopback or critical devices.
3068          * We do not want to remove loopback address or addresses used for root NFS. */
3069         if (!(link->flags & IFF_LOOPBACK) &&
3070             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3071                 r = link_drop_foreign_config(link);
3072                 if (r < 0)
3073                         return r;
3074         }
3075
3076         /* The kernel resets ipv6 mtu after changing device mtu;
3077          * we must set this here, after we've set device mtu */
3078         r = link_set_ipv6_mtu(link);
3079         if (r < 0)
3080                 return r;
3081
3082         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3083                 r = link_acquire_conf(link);
3084                 if (r < 0)
3085                         return r;
3086         }
3087
3088         return link_enter_join_netdev(link);
3089 }
3090
3091 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3092         assert(duid);
3093
3094         if (duid->raw_data_len > 0)
3095                 return 0;
3096
3097         if (duid->type != DUID_TYPE_UUID)
3098                 return -EINVAL;
3099
3100         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3101         duid->raw_data_len = sizeof(sd_id128_t);
3102
3103         return 1;
3104 }
3105
3106 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3107         Manager *manager = userdata;
3108         const sd_bus_error *e;
3109         const void *a;
3110         size_t sz;
3111         DUID *duid;
3112         Link *link;
3113         int r;
3114
3115         assert(m);
3116         assert(manager);
3117
3118         e = sd_bus_message_get_error(m);
3119         if (e) {
3120                 log_error_errno(sd_bus_error_get_errno(e),
3121                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3122                                 e->message);
3123                 goto configure;
3124         }
3125
3126         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3127         if (r < 0)
3128                 goto configure;
3129
3130         if (sz != sizeof(sd_id128_t)) {
3131                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3132                 goto configure;
3133         }
3134
3135         memcpy(&manager->product_uuid, a, sz);
3136         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3137                 (void) duid_set_uuid(duid, manager->product_uuid);
3138
3139         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3140
3141 configure:
3142         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3143                 link_unref(link);
3144
3145                 r = link_configure(link);
3146                 if (r < 0)
3147                         link_enter_failed(link);
3148         }
3149
3150         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3151
3152         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3153          * even if the method fails. */
3154         manager->has_product_uuid = true;
3155
3156         return 1;
3157 }
3158
3159 static bool link_requires_uuid(Link *link) {
3160         const DUID *duid;
3161
3162         assert(link);
3163         assert(link->manager);
3164         assert(link->network);
3165
3166         duid = link_get_duid(link);
3167         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3168                 return false;
3169
3170         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3171                 return true;
3172
3173         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3174                 return true;
3175
3176         return false;
3177 }
3178
3179 static int link_configure_duid(Link *link) {
3180         Manager *m;
3181         DUID *duid;
3182         int r;
3183
3184         assert(link);
3185         assert(link->manager);
3186         assert(link->network);
3187
3188         m = link->manager;
3189         duid = link_get_duid(link);
3190
3191         if (!link_requires_uuid(link))
3192                 return 1;
3193
3194         if (m->has_product_uuid) {
3195                 (void) duid_set_uuid(duid, m->product_uuid);
3196                 return 1;
3197         }
3198
3199         if (!m->links_requesting_uuid) {
3200                 r = manager_request_product_uuid(m, link);
3201                 if (r < 0) {
3202                         if (r == -ENOMEM)
3203                                 return r;
3204
3205                         log_link_warning_errno(link, r,
3206                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3207                         return 1;
3208                 }
3209         } else {
3210                 r = set_put(m->links_requesting_uuid, link);
3211                 if (r < 0)
3212                         return log_oom();
3213                 if (r > 0)
3214                         link_ref(link);
3215
3216                 r = set_put(m->duids_requesting_uuid, duid);
3217                 if (r < 0)
3218                         return log_oom();
3219         }
3220
3221         return 0;
3222 }
3223
3224 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3225         Network *network;
3226         int r;
3227
3228         if (m) {
3229                 _cleanup_strv_free_ char **s = NULL;
3230
3231                 r = sd_netlink_message_get_errno(m);
3232                 if (r < 0)
3233                         return r;
3234
3235                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3236                 if (r < 0 && r != -ENODATA)
3237                         return r;
3238
3239                 strv_free_and_replace(link->alternative_names, s);
3240         }
3241
3242         r = network_get(link->manager, link->iftype, link->sd_device,
3243                         link->ifname, link->alternative_names, link->driver,
3244                         &link->mac, &link->permanent_mac,
3245                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3246         if (r == -ENOENT) {
3247                 link_enter_unmanaged(link);
3248                 return 0;
3249         } else if (r == 0 && network->unmanaged) {
3250                 link_enter_unmanaged(link);
3251                 return 0;
3252         } else if (r < 0)
3253                 return r;
3254
3255         if (link->network == network && !force)
3256                 return 0;
3257
3258         log_link_info(link, "Re-configuring with %s", network->filename);
3259
3260         /* Dropping old .network file */
3261         r = link_stop_clients(link, false);
3262         if (r < 0)
3263                 return r;
3264
3265         if (link_dhcp4_server_enabled(link))
3266                 (void) sd_dhcp_server_stop(link->dhcp_server);
3267
3268         r = link_drop_config(link);
3269         if (r < 0)
3270                 return r;
3271
3272         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3273                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3274                 r = link_drop_foreign_config(link);
3275                 if (r < 0)
3276                         return r;
3277         }
3278
3279         link_free_carrier_maps(link);
3280         link_free_engines(link);
3281         link->network = network_unref(link->network);
3282
3283         /* Then, apply new .network file */
3284         r = network_apply(network, link);
3285         if (r < 0)
3286                 return r;
3287
3288         r = link_new_carrier_maps(link);
3289         if (r < 0)
3290                 return r;
3291
3292         link_set_state(link, LINK_STATE_INITIALIZED);
3293         link_dirty(link);
3294
3295         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3296          * link_configure() is called later asynchronously. */
3297         r = link_configure_duid(link);
3298         if (r <= 0)
3299                 return r;
3300
3301         r = link_configure(link);
3302         if (r < 0)
3303                 return r;
3304
3305         return 0;
3306 }
3307
3308 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3309         int r;
3310
3311         r = link_reconfigure_internal(link, m, false);
3312         if (r < 0)
3313                 link_enter_failed(link);
3314
3315         return 1;
3316 }
3317
3318 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3319         int r;
3320
3321         r = link_reconfigure_internal(link, m, true);
3322         if (r < 0)
3323                 link_enter_failed(link);
3324
3325         return 1;
3326 }
3327
3328 int link_reconfigure(Link *link, bool force) {
3329         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3330         int r;
3331
3332         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3333                 return 0;
3334
3335         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3336                                      link->ifindex);
3337         if (r < 0)
3338                 return r;
3339
3340         r = netlink_call_async(link->manager->rtnl, NULL, req,
3341                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3342                                link_netlink_destroy_callback, link);
3343         if (r < 0)
3344                 return r;
3345
3346         link_ref(link);
3347
3348         return 0;
3349 }
3350
3351 static int link_initialized_and_synced(Link *link) {
3352         Network *network;
3353         int r;
3354
3355         assert(link);
3356         assert(link->ifname);
3357         assert(link->manager);
3358
3359         /* We may get called either from the asynchronous netlink callback,
3360          * or directly for link_add() if running in a container. See link_add(). */
3361         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3362                 return 0;
3363
3364         log_link_debug(link, "Link state is up-to-date");
3365         link_set_state(link, LINK_STATE_INITIALIZED);
3366
3367         r = link_new_bound_by_list(link);
3368         if (r < 0)
3369                 return r;
3370
3371         r = link_handle_bound_by_list(link);
3372         if (r < 0)
3373                 return r;
3374
3375         if (!link->network) {
3376                 r = wifi_get_info(link);
3377                 if (r < 0)
3378                         return r;
3379
3380                 r = network_get(link->manager, link->iftype, link->sd_device,
3381                                 link->ifname, link->alternative_names, link->driver,
3382                                 &link->mac, &link->permanent_mac,
3383                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3384                 if (r == -ENOENT) {
3385                         link_enter_unmanaged(link);
3386                         return 0;
3387                 } else if (r == 0 && network->unmanaged) {
3388                         link_enter_unmanaged(link);
3389                         return 0;
3390                 } else if (r < 0)
3391                         return r;
3392
3393                 if (link->flags & IFF_LOOPBACK) {
3394                         if (network->link_local != ADDRESS_FAMILY_NO)
3395                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3396
3397                         if (network->dhcp != ADDRESS_FAMILY_NO)
3398                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3399
3400                         if (network->dhcp_server)
3401                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3402                 }
3403
3404                 r = network_apply(network, link);
3405                 if (r < 0)
3406                         return r;
3407         }
3408
3409         r = link_new_bound_to_list(link);
3410         if (r < 0)
3411                 return r;
3412
3413         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3414          * link_configure() is called later asynchronously. */
3415         r = link_configure_duid(link);
3416         if (r <= 0)
3417                 return r;
3418
3419         r = link_configure(link);
3420         if (r < 0)
3421                 return r;
3422
3423         return 0;
3424 }
3425
3426 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3427         _cleanup_strv_free_ char **s = NULL;
3428         int r;
3429
3430         r = sd_netlink_message_get_errno(m);
3431         if (r < 0) {
3432                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3433                 link_enter_failed(link);
3434                 return 0;
3435         }
3436
3437         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3438         if (r < 0 && r != -ENODATA) {
3439                 link_enter_failed(link);
3440                 return 0;
3441         }
3442
3443         strv_free_and_replace(link->alternative_names, s);
3444
3445         r = link_initialized_and_synced(link);
3446         if (r < 0)
3447                 link_enter_failed(link);
3448         return 1;
3449 }
3450
3451 int link_initialized(Link *link, sd_device *device) {
3452         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3453         int r;
3454
3455         assert(link);
3456         assert(link->manager);
3457         assert(link->manager->rtnl);
3458         assert(device);
3459
3460         if (link->state != LINK_STATE_PENDING)
3461                 return 0;
3462
3463         if (link->sd_device)
3464                 return 0;
3465
3466         log_link_debug(link, "udev initialized link");
3467         link_set_state(link, LINK_STATE_INITIALIZED);
3468
3469         link->sd_device = sd_device_ref(device);
3470
3471         /* udev has initialized the link, but we don't know if we have yet
3472          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3473          * when it returns we know that the pending NEWLINKs have already been
3474          * processed and that we are up-to-date */
3475
3476         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3477                                      link->ifindex);
3478         if (r < 0)
3479                 return r;
3480
3481         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3482                                link_netlink_destroy_callback, link);
3483         if (r < 0)
3484                 return r;
3485
3486         link_ref(link);
3487
3488         return 0;
3489 }
3490
3491 static int link_load(Link *link) {
3492         _cleanup_free_ char *network_file = NULL,
3493                             *addresses = NULL,
3494                             *routes = NULL,
3495                             *dhcp4_address = NULL,
3496                             *ipv4ll_address = NULL;
3497         union in_addr_union address;
3498         int r;
3499
3500         assert(link);
3501
3502         r = parse_env_file(NULL, link->state_file,
3503                            "NETWORK_FILE", &network_file,
3504                            "ADDRESSES", &addresses,
3505                            "ROUTES", &routes,
3506                            "DHCP4_ADDRESS", &dhcp4_address,
3507                            "IPV4LL_ADDRESS", &ipv4ll_address);
3508         if (r < 0 && r != -ENOENT)
3509                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3510
3511         if (network_file) {
3512                 Network *network;
3513                 char *suffix;
3514
3515                 /* drop suffix */
3516                 suffix = strrchr(network_file, '.');
3517                 if (!suffix) {
3518                         log_link_debug(link, "Failed to get network name from %s", network_file);
3519                         goto network_file_fail;
3520                 }
3521                 *suffix = '\0';
3522
3523                 r = network_get_by_name(link->manager, basename(network_file), &network);
3524                 if (r < 0) {
3525                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3526                         goto network_file_fail;
3527                 }
3528
3529                 r = network_apply(network, link);
3530                 if (r < 0)
3531                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3532         }
3533
3534 network_file_fail:
3535
3536         for (const char *p = addresses; p; ) {
3537                 _cleanup_free_ char *address_str = NULL;
3538                 char *prefixlen_str;
3539                 int family;
3540                 unsigned char prefixlen;
3541
3542                 r = extract_first_word(&p, &address_str, NULL, 0);
3543                 if (r < 0)
3544                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3545                 if (r <= 0)
3546                         break;
3547
3548                 prefixlen_str = strchr(address_str, '/');
3549                 if (!prefixlen_str) {
3550                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3551                         continue;
3552                 }
3553                 *prefixlen_str++ = '\0';
3554
3555                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3556                 if (r != 1) {
3557                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3558                         continue;
3559                 }
3560
3561                 r = in_addr_from_string_auto(address_str, &family, &address);
3562                 if (r < 0) {
3563                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3564                         continue;
3565                 }
3566
3567                 r = address_add(link, family, &address, prefixlen, NULL);
3568                 if (r < 0)
3569                         return log_link_error_errno(link, r, "Failed to add address: %m");
3570         }
3571
3572         for (const char *p = routes; p; ) {
3573                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3574                 _cleanup_(route_freep) Route *tmp = NULL;
3575                 _cleanup_free_ char *route_str = NULL;
3576                 char *prefixlen_str;
3577                 Route *route;
3578
3579                 r = extract_first_word(&p, &route_str, NULL, 0);
3580                 if (r < 0)
3581                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3582                 if (r <= 0)
3583                         break;
3584
3585                 prefixlen_str = strchr(route_str, '/');
3586                 if (!prefixlen_str) {
3587                         log_link_debug(link, "Failed to parse route %s", route_str);
3588                         continue;
3589                 }
3590                 *prefixlen_str++ = '\0';
3591
3592                 r = route_new(&tmp);
3593                 if (r < 0)
3594                         return log_oom();
3595
3596                 r = sscanf(prefixlen_str,
3597                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3598                            &tmp->dst_prefixlen,
3599                            &tmp->tos,
3600                            &tmp->priority,
3601                            &tmp->table,
3602                            &tmp->lifetime);
3603                 if (r != 5) {
3604                         log_link_debug(link,
3605                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3606                                        prefixlen_str);
3607                         continue;
3608                 }
3609
3610                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3611                 if (r < 0) {
3612                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3613                         continue;
3614                 }
3615
3616                 r = route_add(link, tmp, &route);
3617                 if (r < 0)
3618                         return log_link_error_errno(link, r, "Failed to add route: %m");
3619
3620                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3621                         r = sd_event_add_time(link->manager->event, &expire,
3622                                               clock_boottime_or_monotonic(),
3623                                               route->lifetime, 0, route_expire_handler, route);
3624                         if (r < 0)
3625                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3626                 }
3627
3628                 sd_event_source_unref(route->expire);
3629                 route->expire = TAKE_PTR(expire);
3630         }
3631
3632         if (dhcp4_address) {
3633                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3634                 if (r < 0) {
3635                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3636                         goto dhcp4_address_fail;
3637                 }
3638
3639                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3640                 if (r < 0)
3641                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3642
3643                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3644                 if (r < 0)
3645                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3646
3647                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3648                 if (r < 0)
3649                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3650         }
3651
3652 dhcp4_address_fail:
3653
3654         if (ipv4ll_address) {
3655                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3656                 if (r < 0) {
3657                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3658                         goto ipv4ll_address_fail;
3659                 }
3660
3661                 r = sd_ipv4ll_new(&link->ipv4ll);
3662                 if (r < 0)
3663                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3664
3665                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3666                 if (r < 0)
3667                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3668
3669                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3670                 if (r < 0)
3671                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3672         }
3673
3674 ipv4ll_address_fail:
3675
3676         return 0;
3677 }
3678
3679 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3680         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3681         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3682         Link *link;
3683         int r;
3684
3685         assert(m);
3686         assert(m->rtnl);
3687         assert(message);
3688         assert(ret);
3689
3690         r = link_new(m, message, ret);
3691         if (r < 0)
3692                 return r;
3693
3694         link = *ret;
3695
3696         log_link_debug(link, "Link %d added", link->ifindex);
3697
3698         r = link_load(link);
3699         if (r < 0)
3700                 return r;
3701
3702         if (path_is_read_only_fs("/sys") <= 0) {
3703                 /* udev should be around */
3704                 sprintf(ifindex_str, "n%d", link->ifindex);
3705                 r = sd_device_new_from_device_id(&device, ifindex_str);
3706                 if (r < 0) {
3707                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3708                         return 0;
3709                 }
3710
3711                 r = sd_device_get_is_initialized(device);
3712                 if (r < 0) {
3713                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3714                         goto failed;
3715                 }
3716                 if (r == 0) {
3717                         /* not yet ready */
3718                         log_link_debug(link, "link pending udev initialization...");
3719                         return 0;
3720                 }
3721
3722                 r = device_is_renaming(device);
3723                 if (r < 0) {
3724                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3725                         goto failed;
3726                 }
3727                 if (r > 0) {
3728                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3729                         return 0;
3730                 }
3731
3732                 r = link_initialized(link, device);
3733                 if (r < 0)
3734                         goto failed;
3735         } else {
3736                 r = link_initialized_and_synced(link);
3737                 if (r < 0)
3738                         goto failed;
3739         }
3740
3741         return 0;
3742 failed:
3743         link_enter_failed(link);
3744         return r;
3745 }
3746
3747 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3748         int r;
3749
3750         assert(link);
3751
3752         log_link_info(link, "Gained IPv6LL");
3753
3754         link->ipv6ll_address = *address;
3755         link_check_ready(link);
3756
3757         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3758                 r = link_acquire_ipv6_conf(link);
3759                 if (r < 0) {
3760                         link_enter_failed(link);
3761                         return r;
3762                 }
3763         }
3764
3765         return 0;
3766 }
3767
3768 static int link_carrier_gained(Link *link) {
3769         int r;
3770
3771         assert(link);
3772
3773         r = wifi_get_info(link);
3774         if (r < 0)
3775                 return r;
3776         if (r > 0) {
3777                 r = link_reconfigure_internal(link, NULL, false);
3778                 if (r < 0) {
3779                         link_enter_failed(link);
3780                         return r;
3781                 }
3782         }
3783
3784         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3785                 r = link_acquire_conf(link);
3786                 if (r < 0) {
3787                         link_enter_failed(link);
3788                         return r;
3789                 }
3790
3791                 link_set_state(link, LINK_STATE_CONFIGURING);
3792                 r = link_request_set_addresses(link);
3793                 if (r < 0)
3794                         return r;
3795         }
3796
3797         r = link_handle_bound_by_list(link);
3798         if (r < 0)
3799                 return r;
3800
3801         return 0;
3802 }
3803
3804 static int link_carrier_lost(Link *link) {
3805         int r;
3806
3807         assert(link);
3808
3809         if (link->network && link->network->ignore_carrier_loss)
3810                 return 0;
3811
3812         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3813          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3814          * configuration and stop the clients as well. */
3815         if (link->setting_mtu)
3816                 return 0;
3817
3818         r = link_stop_clients(link, false);
3819         if (r < 0) {
3820                 link_enter_failed(link);
3821                 return r;
3822         }
3823
3824         if (link_dhcp4_server_enabled(link))
3825                 (void) sd_dhcp_server_stop(link->dhcp_server);
3826
3827         r = link_drop_config(link);
3828         if (r < 0)
3829                 return r;
3830
3831         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3832                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3833                 r = link_drop_foreign_config(link);
3834                 if (r < 0)
3835                         return r;
3836         }
3837
3838         r = link_handle_bound_by_list(link);
3839         if (r < 0)
3840                 return r;
3841
3842         return 0;
3843 }
3844
3845 int link_carrier_reset(Link *link) {
3846         int r;
3847
3848         assert(link);
3849
3850         if (link_has_carrier(link)) {
3851                 r = link_carrier_lost(link);
3852                 if (r < 0)
3853                         return r;
3854
3855                 r = link_carrier_gained(link);
3856                 if (r < 0)
3857                         return r;
3858
3859                 log_link_info(link, "Reset carrier");
3860         }
3861
3862         return 0;
3863 }
3864
3865 /* This is called every time an interface admin state changes to up;
3866  * specifically, when IFF_UP flag changes from unset to set */
3867 static int link_admin_state_up(Link *link) {
3868         int r;
3869
3870         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3871          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3872          * ipv6_mtu_set prevents this from trying to set it too early before
3873          * the link->network has been setup; we only need to reset it
3874          * here if we've already set it during normal initialization. */
3875         if (link->ipv6_mtu_set) {
3876                 r = link_set_ipv6_mtu(link);
3877                 if (r < 0)
3878                         return r;
3879         }
3880
3881         return 0;
3882 }
3883
3884 int link_update(Link *link, sd_netlink_message *m) {
3885         _cleanup_strv_free_ char **s = NULL;
3886         struct ether_addr mac;
3887         const char *ifname;
3888         uint32_t mtu;
3889         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3890         int old_master, r;
3891
3892         assert(link);
3893         assert(link->ifname);
3894         assert(m);
3895
3896         if (link->state == LINK_STATE_LINGER) {
3897                 log_link_info(link, "Link re-added");
3898                 link_set_state(link, LINK_STATE_CONFIGURING);
3899
3900                 r = link_new_carrier_maps(link);
3901                 if (r < 0)
3902                         return r;
3903         }
3904
3905         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3906         if (r >= 0 && !streq(ifname, link->ifname)) {
3907                 Manager *manager = link->manager;
3908
3909                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3910
3911                 link_drop(link);
3912                 r = link_add(manager, m, &link);
3913                 if (r < 0)
3914                         return r;
3915         }
3916
3917         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3918         if (r >= 0)
3919                 strv_free_and_replace(link->alternative_names, s);
3920
3921         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3922         if (r >= 0 && mtu > 0) {
3923                 link->mtu = mtu;
3924                 if (link->original_mtu == 0) {
3925                         link->original_mtu = mtu;
3926                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3927                 }
3928
3929                 if (link->dhcp_client) {
3930                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3931                                                    link->mtu);
3932                         if (r < 0)
3933                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3934                 }
3935
3936                 if (link->radv) {
3937                         r = sd_radv_set_mtu(link->radv, link->mtu);
3938                         if (r < 0)
3939                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3940                 }
3941         }
3942
3943         /* The kernel may broadcast NEWLINK messages without the MAC address
3944            set, simply ignore them. */
3945         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3946         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
3947
3948                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
3949
3950                 log_link_debug(link, "Gained new MAC address: "
3951                                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3952                                mac.ether_addr_octet[0],
3953                                mac.ether_addr_octet[1],
3954                                mac.ether_addr_octet[2],
3955                                mac.ether_addr_octet[3],
3956                                mac.ether_addr_octet[4],
3957                                mac.ether_addr_octet[5]);
3958
3959                 if (link->ipv4ll) {
3960                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
3961
3962                         if (restart) {
3963                                 r = sd_ipv4ll_stop(link->ipv4ll);
3964                                 if (r < 0)
3965                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
3966                         }
3967
3968                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3969                         if (r < 0)
3970                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3971
3972                         if (restart) {
3973                                 r = sd_ipv4ll_start(link->ipv4ll);
3974                                 if (r < 0)
3975                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
3976                         }
3977                 }
3978
3979                 if (link->dhcp_client) {
3980                         r = sd_dhcp_client_set_mac(link->dhcp_client,
3981                                                    (const uint8_t *) &link->mac,
3982                                                    sizeof (link->mac),
3983                                                    ARPHRD_ETHER);
3984                         if (r < 0)
3985                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3986
3987                         r = dhcp4_set_client_identifier(link);
3988                         if (r < 0)
3989                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
3990                 }
3991
3992                 if (link->dhcp6_client) {
3993                         const DUID* duid = link_get_duid(link);
3994                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
3995
3996                         if (restart) {
3997                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
3998                                 if (r < 0)
3999                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
4000                         }
4001
4002                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
4003                                                     (const uint8_t *) &link->mac,
4004                                                     sizeof (link->mac),
4005                                                     ARPHRD_ETHER);
4006                         if (r < 0)
4007                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4008
4009                         if (link->network->iaid_set) {
4010                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4011                                 if (r < 0)
4012                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4013                         }
4014
4015                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4016                                                      duid->type,
4017                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4018                                                      duid->raw_data_len);
4019                         if (r < 0)
4020                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4021
4022                         if (restart) {
4023                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4024                                 if (r < 0)
4025                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4026                         }
4027                 }
4028
4029                 if (link->radv) {
4030                         bool restart = sd_radv_is_running(link->radv);
4031
4032                         if (restart) {
4033                                 r = sd_radv_stop(link->radv);
4034                                 if (r < 0)
4035                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4036                         }
4037
4038                         r = sd_radv_set_mac(link->radv, &link->mac);
4039                         if (r < 0)
4040                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4041
4042                         if (restart) {
4043                                 r = sd_radv_start(link->radv);
4044                                 if (r < 0)
4045                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4046                         }
4047                 }
4048
4049                 if (link->ndisc) {
4050                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4051                         if (r < 0)
4052                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4053                 }
4054         }
4055
4056         old_master = link->master_ifindex;
4057         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4058
4059         link_was_admin_up = link->flags & IFF_UP;
4060         had_carrier = link_has_carrier(link);
4061
4062         r = link_update_flags(link, m, old_master != link->master_ifindex);
4063         if (r < 0)
4064                 return r;
4065
4066         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4067                 log_link_info(link, "Link UP");
4068
4069                 r = link_admin_state_up(link);
4070                 if (r < 0)
4071                         return r;
4072         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4073                 log_link_info(link, "Link DOWN");
4074
4075         r = link_update_lldp(link);
4076         if (r < 0)
4077                 return r;
4078
4079         carrier_gained = !had_carrier && link_has_carrier(link);
4080         carrier_lost = had_carrier && !link_has_carrier(link);
4081
4082         if (carrier_gained) {
4083                 log_link_info(link, "Gained carrier");
4084
4085                 r = link_carrier_gained(link);
4086                 if (r < 0)
4087                         return r;
4088         } else if (carrier_lost) {
4089                 log_link_info(link, "Lost carrier");
4090
4091                 r = link_carrier_lost(link);
4092                 if (r < 0)
4093                         return r;
4094         }
4095
4096         return 0;
4097 }
4098
4099 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4100         bool space = false;
4101         Iterator i;
4102         Link *link;
4103
4104         assert(f);
4105         assert(prefix);
4106
4107         if (hashmap_isempty(h))
4108                 return;
4109
4110         fputs(prefix, f);
4111         HASHMAP_FOREACH(link, h, i) {
4112                 if (space)
4113                         fputc(' ', f);
4114
4115                 fprintf(f, "%i", link->ifindex);
4116                 space = true;
4117         }
4118
4119         fputc('\n', f);
4120 }
4121
4122 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4123         for (unsigned j = 0; j < n_dns; j++) {
4124                 const char *str;
4125
4126                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4127                         continue;
4128
4129                 str = in_addr_full_to_string(dns[j]);
4130                 if (!str)
4131                         continue;
4132
4133                 if (*space)
4134                         fputc(' ', f);
4135                 fputs(str, f);
4136                 *space = true;
4137         }
4138 }
4139
4140 static void serialize_addresses(
4141                 FILE *f,
4142                 const char *lvalue,
4143                 bool *space,
4144                 char **addresses,
4145                 sd_dhcp_lease *lease,
4146                 bool conditional,
4147                 sd_dhcp_lease_server_type what,
4148                 sd_dhcp6_lease *lease6,
4149                 bool conditional6,
4150                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4151                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4152         int r;
4153
4154         bool _space = false;
4155         if (!space)
4156                 space = &_space;
4157
4158         if (lvalue)
4159                 fprintf(f, "%s=", lvalue);
4160         fputstrv(f, addresses, NULL, space);
4161
4162         if (lease && conditional) {
4163                 const struct in_addr *lease_addresses;
4164
4165                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4166                 if (r > 0)
4167                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4168         }
4169
4170         if (lease6 && conditional6 && lease6_get_addr) {
4171                 const struct in6_addr *in6_addrs;
4172
4173                 r = lease6_get_addr(lease6, &in6_addrs);
4174                 if (r > 0)
4175                         serialize_in6_addrs(f, in6_addrs, r, space);
4176         }
4177
4178         if (lease6 && conditional6 && lease6_get_fqdn) {
4179                 char **in6_hosts;
4180
4181                 r = lease6_get_fqdn(lease6, &in6_hosts);
4182                 if (r > 0)
4183                         fputstrv(f, in6_hosts, NULL, space);
4184         }
4185
4186         if (lvalue)
4187                 fputc('\n', f);
4188 }
4189
4190 int link_save(Link *link) {
4191         const char *admin_state, *oper_state, *carrier_state, *address_state;
4192         _cleanup_free_ char *temp_path = NULL;
4193         _cleanup_fclose_ FILE *f = NULL;
4194         Route *route;
4195         Address *a;
4196         Iterator i;
4197         int r;
4198
4199         assert(link);
4200         assert(link->state_file);
4201         assert(link->lease_file);
4202         assert(link->manager);
4203
4204         if (link->state == LINK_STATE_LINGER) {
4205                 (void) unlink(link->state_file);
4206                 return 0;
4207         }
4208
4209         link_lldp_save(link);
4210
4211         admin_state = link_state_to_string(link->state);
4212         assert(admin_state);
4213
4214         oper_state = link_operstate_to_string(link->operstate);
4215         assert(oper_state);
4216
4217         carrier_state = link_carrier_state_to_string(link->carrier_state);
4218         assert(carrier_state);
4219
4220         address_state = link_address_state_to_string(link->address_state);
4221         assert(address_state);
4222
4223         r = fopen_temporary(link->state_file, &f, &temp_path);
4224         if (r < 0)
4225                 goto fail;
4226
4227         (void) fchmod(fileno(f), 0644);
4228
4229         fprintf(f,
4230                 "# This is private data. Do not parse.\n"
4231                 "ADMIN_STATE=%s\n"
4232                 "OPER_STATE=%s\n"
4233                 "CARRIER_STATE=%s\n"
4234                 "ADDRESS_STATE=%s\n",
4235                 admin_state, oper_state, carrier_state, address_state);
4236
4237         if (link->network) {
4238                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4239                 const char *dhcp_domainname = NULL, *p;
4240                 sd_dhcp6_lease *dhcp6_lease = NULL;
4241                 bool space;
4242
4243                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4244                         yes_no(link->network->required_for_online));
4245
4246                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4247                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4248                         strempty(link_operstate_to_string(st.min)),
4249                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4250                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4251
4252                 if (link->dhcp6_client) {
4253                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4254                         if (r < 0 && r != -ENOMSG)
4255                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4256                 }
4257
4258                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4259
4260                 /************************************************************/
4261
4262                 fputs("DNS=", f);
4263                 space = false;
4264                 if (link->n_dns != (unsigned) -1)
4265                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4266                 else
4267                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4268
4269                 serialize_addresses(f, NULL, &space,
4270                                     NULL,
4271                                     link->dhcp_lease,
4272                                     link->network->dhcp_use_dns,
4273                                     SD_DHCP_LEASE_DNS,
4274                                     dhcp6_lease,
4275                                     link->network->dhcp6_use_dns,
4276                                     sd_dhcp6_lease_get_dns,
4277                                     NULL);
4278
4279                 /* Make sure to flush out old entries before we use the NDisc data */
4280                 ndisc_vacuum(link);
4281
4282                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4283                         NDiscRDNSS *dd;
4284
4285                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4286                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4287                 }
4288
4289                 fputc('\n', f);
4290
4291                 /************************************************************/
4292
4293                 serialize_addresses(f, "NTP", NULL,
4294                                     link->ntp ?: link->network->ntp,
4295                                     link->dhcp_lease,
4296                                     link->network->dhcp_use_ntp,
4297                                     SD_DHCP_LEASE_NTP,
4298                                     dhcp6_lease,
4299                                     link->network->dhcp6_use_ntp,
4300                                     sd_dhcp6_lease_get_ntp_addrs,
4301                                     sd_dhcp6_lease_get_ntp_fqdn);
4302
4303                 serialize_addresses(f, "SIP", NULL,
4304                                     NULL,
4305                                     link->dhcp_lease,
4306                                     link->network->dhcp_use_sip,
4307                                     SD_DHCP_LEASE_SIP,
4308                                     NULL, false, NULL, NULL);
4309
4310                 /************************************************************/
4311
4312                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4313                         if (link->dhcp_lease) {
4314                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4315                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4316                         }
4317                         if (dhcp6_lease)
4318                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4319                 }
4320
4321                 fputs("DOMAINS=", f);
4322                 space = false;
4323                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4324                         fputs_with_space(f, p, NULL, &space);
4325
4326                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4327                         if (dhcp_domainname)
4328                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4329                         if (dhcp_domains)
4330                                 fputstrv(f, dhcp_domains, NULL, &space);
4331                         if (dhcp6_domains)
4332                                 fputstrv(f, dhcp6_domains, NULL, &space);
4333                 }
4334
4335                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4336                         NDiscDNSSL *dd;
4337
4338                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4339                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4340                 }
4341
4342                 fputc('\n', f);
4343
4344                 /************************************************************/
4345
4346                 fputs("ROUTE_DOMAINS=", f);
4347                 space = false;
4348                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4349                         fputs_with_space(f, p, NULL, &space);
4350
4351                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4352                         if (dhcp_domainname)
4353                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4354                         if (dhcp_domains)
4355                                 fputstrv(f, dhcp_domains, NULL, &space);
4356                         if (dhcp6_domains)
4357                                 fputstrv(f, dhcp6_domains, NULL, &space);
4358                 }
4359
4360                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4361                         NDiscDNSSL *dd;
4362
4363                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4364                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4365                 }
4366
4367                 fputc('\n', f);
4368
4369                 /************************************************************/
4370
4371                 fprintf(f, "LLMNR=%s\n",
4372                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4373
4374                 /************************************************************/
4375
4376                 fprintf(f, "MDNS=%s\n",
4377                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4378
4379                 /************************************************************/
4380
4381                 int dns_default_route =
4382                         link->dns_default_route >= 0 ? link->dns_default_route :
4383                         link->network->dns_default_route;
4384                 if (dns_default_route >= 0)
4385                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4386
4387                 /************************************************************/
4388
4389                 DnsOverTlsMode dns_over_tls_mode =
4390                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4391                         link->network->dns_over_tls_mode;
4392                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4393                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4394
4395                 /************************************************************/
4396
4397                 DnssecMode dnssec_mode =
4398                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4399                         link->network->dnssec_mode;
4400                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4401                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4402
4403                 /************************************************************/
4404
4405                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4406                 if (set_isempty(nta_anchors))
4407                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4408
4409                 if (!set_isempty(nta_anchors)) {
4410                         const char *n;
4411
4412                         fputs("DNSSEC_NTA=", f);
4413                         space = false;
4414                         SET_FOREACH(n, nta_anchors, i)
4415                                 fputs_with_space(f, n, NULL, &space);
4416                         fputc('\n', f);
4417                 }
4418
4419                 /************************************************************/
4420
4421                 fputs("ADDRESSES=", f);
4422                 space = false;
4423                 SET_FOREACH(a, link->addresses, i) {
4424                         _cleanup_free_ char *address_str = NULL;
4425
4426                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4427                         if (r < 0)
4428                                 goto fail;
4429
4430                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4431                         space = true;
4432                 }
4433                 fputc('\n', f);
4434
4435                 /************************************************************/
4436
4437                 fputs("ROUTES=", f);
4438                 space = false;
4439                 SET_FOREACH(route, link->routes, i) {
4440                         _cleanup_free_ char *route_str = NULL;
4441
4442                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4443                         if (r < 0)
4444                                 goto fail;
4445
4446                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4447                                 space ? " " : "", route_str,
4448                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4449                         space = true;
4450                 }
4451
4452                 fputc('\n', f);
4453         }
4454
4455         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4456         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4457
4458         if (link->dhcp_lease) {
4459                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4460                 if (r < 0)
4461                         goto fail;
4462
4463                 fprintf(f,
4464                         "DHCP_LEASE=%s\n",
4465                         link->lease_file);
4466         } else
4467                 (void) unlink(link->lease_file);
4468
4469         if (link->ipv4ll) {
4470                 struct in_addr address;
4471
4472                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4473                 if (r >= 0) {
4474                         fputs("IPV4LL_ADDRESS=", f);
4475                         serialize_in_addrs(f, &address, 1, false, NULL);
4476                         fputc('\n', f);
4477                 }
4478         }
4479
4480         if (link->dhcp6_client) {
4481                 _cleanup_free_ char *duid = NULL;
4482                 uint32_t iaid;
4483
4484                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4485                 if (r >= 0)
4486                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4487
4488                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4489                 if (r >= 0)
4490                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4491         }
4492
4493         r = fflush_and_check(f);
4494         if (r < 0)
4495                 goto fail;
4496
4497         if (rename(temp_path, link->state_file) < 0) {
4498                 r = -errno;
4499                 goto fail;
4500         }
4501
4502         return 0;
4503
4504 fail:
4505         (void) unlink(link->state_file);
4506         if (temp_path)
4507                 (void) unlink(temp_path);
4508
4509         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4510 }
4511
4512 /* The serialized state in /run is no longer up-to-date. */
4513 void link_dirty(Link *link) {
4514         int r;
4515
4516         assert(link);
4517
4518         /* mark manager dirty as link is dirty */
4519         manager_dirty(link->manager);
4520
4521         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4522         if (r <= 0)
4523                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4524                 return;
4525         link_ref(link);
4526 }
4527
4528 /* The serialized state in /run is up-to-date */
4529 void link_clean(Link *link) {
4530         assert(link);
4531         assert(link->manager);
4532
4533         link_unref(set_remove(link->manager->dirty_links, link));
4534 }
4535
4536 int link_save_and_clean(Link *link) {
4537         int r;
4538
4539         r = link_save(link);
4540         if (r < 0)
4541                 return r;
4542
4543         link_clean(link);
4544         return 0;
4545 }
4546
4547 static const char* const link_state_table[_LINK_STATE_MAX] = {
4548         [LINK_STATE_PENDING] = "pending",
4549         [LINK_STATE_INITIALIZED] = "initialized",
4550         [LINK_STATE_CONFIGURING] = "configuring",
4551         [LINK_STATE_CONFIGURED] = "configured",
4552         [LINK_STATE_UNMANAGED] = "unmanaged",
4553         [LINK_STATE_FAILED] = "failed",
4554         [LINK_STATE_LINGER] = "linger",
4555 };
4556
4557 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4558
4559 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4560         const char *err_msg = NULL;
4561
4562         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4563         return log_link_full(link, level, err,
4564                              "%s: %s%s%s%m",
4565                              msg,
4566                              strempty(err_msg),
4567                              err_msg && !endswith(err_msg, ".") ? "." : "",
4568                              err_msg ? " " : "");
4569 }