src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5 #include <linux/if_arp.h>
   6 #include <linux/if_link.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "bond.h"
  11 #include "bridge.h"
  12 #include "bus-util.h"
  13 #include "dhcp-identifier.h"
  14 #include "dhcp-lease-internal.h"
  15 #include "env-file.h"
  16 #include "ethtool-util.h"
  17 #include "fd-util.h"
  18 #include "fileio.h"
  19 #include "ipvlan.h"
  20 #include "missing_network.h"
  21 #include "netlink-util.h"
  22 #include "network-internal.h"
  23 #include "networkd-can.h"
  24 #include "networkd-dhcp-server.h"
  25 #include "networkd-dhcp4.h"
  26 #include "networkd-dhcp6.h"
  27 #include "networkd-ipv4ll.h"
  28 #include "networkd-ipv6-proxy-ndp.h"
  29 #include "networkd-link-bus.h"
  30 #include "networkd-link.h"
  31 #include "networkd-lldp-tx.h"
  32 #include "networkd-manager.h"
  33 #include "networkd-ndisc.h"
  34 #include "networkd-neighbor.h"
  35 #include "networkd-sriov.h"
  36 #include "networkd-radv.h"
  37 #include "networkd-routing-policy-rule.h"
  38 #include "networkd-wifi.h"
  39 #include "set.h"
  40 #include "socket-util.h"
  41 #include "stat-util.h"
  42 #include "stdio-util.h"
  43 #include "string-table.h"
  44 #include "strv.h"
  45 #include "sysctl-util.h"
  46 #include "tc.h"
  47 #include "tmpfile-util.h"
  48 #include "udev-util.h"
  49 #include "util.h"
  50 #include "vrf.h"
  51
  52 uint32_t link_get_vrf_table(Link *link) {
  53         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  54 }
  55
  56 uint32_t link_get_dhcp_route_table(Link *link) {
  57         /* When the interface is part of an VRF use the VRFs routing table, unless
  58          * another table is explicitly specified. */
  59         if (link->network->dhcp_route_table_set)
  60                 return link->network->dhcp_route_table;
  61         return link_get_vrf_table(link);
  62 }
  63
  64 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  65         if (link->network->ipv6_accept_ra_route_table_set)
  66                 return link->network->ipv6_accept_ra_route_table;
  67         return link_get_vrf_table(link);
  68 }
  69
  70 DUID* link_get_duid(Link *link) {
  71         if (link->network->duid.type != _DUID_TYPE_INVALID)
  72                 return &link->network->duid;
  73         else
  74                 return &link->manager->duid;
  75 }
  76
  77 static bool link_dhcp6_enabled(Link *link) {
  78         assert(link);
  79
  80         if (!socket_ipv6_is_supported())
  81                 return false;
  82
  83         if (link->flags & IFF_LOOPBACK)
  84                 return false;
  85
  86         if (!link->network)
  87                 return false;
  88
  89         if (link->network->bond)
  90                 return false;
  91
  92         if (link->iftype == ARPHRD_CAN)
  93                 return false;
  94
  95         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
  96 }
  97
  98 static bool link_dhcp4_enabled(Link *link) {
  99         assert(link);
 100
 101         if (link->flags & IFF_LOOPBACK)
 102                 return false;
 103
 104         if (!link->network)
 105                 return false;
 106
 107         if (link->network->bond)
 108                 return false;
 109
 110         if (link->iftype == ARPHRD_CAN)
 111                 return false;
 112
 113         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 114 }
 115
 116 static bool link_dhcp4_server_enabled(Link *link) {
 117         assert(link);
 118
 119         if (link->flags & IFF_LOOPBACK)
 120                 return false;
 121
 122         if (!link->network)
 123                 return false;
 124
 125         if (link->network->bond)
 126                 return false;
 127
 128         if (link->iftype == ARPHRD_CAN)
 129                 return false;
 130
 131         return link->network->dhcp_server;
 132 }
 133
 134 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
 135         assert(link);
 136         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 137
 138         if (link->flags & IFF_LOOPBACK)
 139                 return false;
 140
 141         if (!link->network)
 142                 return false;
 143
 144         if (link->iftype == ARPHRD_CAN)
 145                 return false;
 146
 147         if (STRPTR_IN_SET(link->kind,
 148                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
 149                           "vti6", "nlmon", "xfrm"))
 150                 return false;
 151
 152         /* L3 or L3S mode do not support ARP. */
 153         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 154                 return false;
 155
 156         if (link->network->bond)
 157                 return false;
 158
 159         return link->network->link_local & mask;
 160 }
 161
 162 static bool link_ipv6ll_enabled(Link *link) {
 163         assert(link);
 164
 165         if (!socket_ipv6_is_supported())
 166                 return false;
 167
 168         if (link->flags & IFF_LOOPBACK)
 169                 return false;
 170
 171         if (!link->network)
 172                 return false;
 173
 174         if (link->iftype == ARPHRD_CAN)
 175                 return false;
 176
 177         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
 178                 return false;
 179
 180         if (link->network->bond)
 181                 return false;
 182
 183         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 184 }
 185
 186 static bool link_ipv6_enabled(Link *link) {
 187         assert(link);
 188
 189         if (!socket_ipv6_is_supported())
 190                 return false;
 191
 192         if (link->network->bond)
 193                 return false;
 194
 195         if (link->iftype == ARPHRD_CAN)
 196                 return false;
 197
 198         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 199         if (link_ipv6ll_enabled(link))
 200                 return true;
 201
 202         if (network_has_static_ipv6_configurations(link->network))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static bool link_radv_enabled(Link *link) {
 209         assert(link);
 210
 211         if (!link_ipv6ll_enabled(link))
 212                 return false;
 213
 214         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 215 }
 216
 217 static bool link_ipv4_forward_enabled(Link *link) {
 218         assert(link);
 219
 220         if (link->flags & IFF_LOOPBACK)
 221                 return false;
 222
 223         if (!link->network)
 224                 return false;
 225
 226         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 227                 return false;
 228
 229         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 230 }
 231
 232 static bool link_ipv6_forward_enabled(Link *link) {
 233         assert(link);
 234
 235         if (!socket_ipv6_is_supported())
 236                 return false;
 237
 238         if (link->flags & IFF_LOOPBACK)
 239                 return false;
 240
 241         if (!link->network)
 242                 return false;
 243
 244         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 245                 return false;
 246
 247         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 248 }
 249
 250 static bool link_proxy_arp_enabled(Link *link) {
 251         assert(link);
 252
 253         if (link->flags & IFF_LOOPBACK)
 254                 return false;
 255
 256         if (!link->network)
 257                 return false;
 258
 259         if (link->network->proxy_arp < 0)
 260                 return false;
 261
 262         return true;
 263 }
 264
 265 static bool link_ipv6_accept_ra_enabled(Link *link) {
 266         assert(link);
 267
 268         if (!socket_ipv6_is_supported())
 269                 return false;
 270
 271         if (link->flags & IFF_LOOPBACK)
 272                 return false;
 273
 274         if (!link->network)
 275                 return false;
 276
 277         if (!link_ipv6ll_enabled(link))
 278                 return false;
 279
 280         /* If unset use system default (enabled if local forwarding is disabled.
 281          * disabled if local forwarding is enabled).
 282          * If set, ignore or enforce RA independent of local forwarding state.
 283          */
 284         if (link->network->ipv6_accept_ra < 0)
 285                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 286                 return !link_ipv6_forward_enabled(link);
 287         else if (link->network->ipv6_accept_ra > 0)
 288                 /* accept RA even if ip_forward is enabled */
 289                 return true;
 290         else
 291                 /* ignore RA */
 292                 return false;
 293 }
 294
 295 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 296         assert(link);
 297
 298         if (!socket_ipv6_is_supported())
 299                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 300
 301         if (link->flags & IFF_LOOPBACK)
 302                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 303
 304         if (!link->network)
 305                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 306
 307         return link->network->ipv6_privacy_extensions;
 308 }
 309
 310 static int link_update_ipv6_sysctl(Link *link) {
 311         bool enabled;
 312         int r;
 313
 314         if (link->flags & IFF_LOOPBACK)
 315                 return 0;
 316
 317         enabled = link_ipv6_enabled(link);
 318         if (enabled) {
 319                 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
 320                 if (r < 0)
 321                         return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
 322
 323                 log_link_info(link, "IPv6 successfully enabled");
 324         }
 325
 326         return 0;
 327 }
 328
 329 static bool link_is_enslaved(Link *link) {
 330         if (link->flags & IFF_SLAVE)
 331                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 332                 return true;
 333
 334         if (!link->network)
 335                 return false;
 336
 337         if (link->master_ifindex > 0 && link->network->bridge)
 338                 return true;
 339
 340         /* TODO: add conditions for other netdevs. */
 341
 342         return false;
 343 }
 344
 345 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 346         Link *master;
 347
 348         if (!netdev)
 349                 return;
 350
 351         if (netdev->ifindex <= 0)
 352                 return;
 353
 354         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 355                 return;
 356
 357         link_update_operstate(master, true);
 358 }
 359
 360 void link_update_operstate(Link *link, bool also_update_master) {
 361         LinkOperationalState operstate;
 362         LinkCarrierState carrier_state;
 363         LinkAddressState address_state;
 364         _cleanup_strv_free_ char **p = NULL;
 365         uint8_t scope = RT_SCOPE_NOWHERE;
 366         bool changed = false;
 367         Address *address;
 368         Iterator i;
 369
 370         assert(link);
 371
 372         if (link->kernel_operstate == IF_OPER_DORMANT)
 373                 carrier_state = LINK_CARRIER_STATE_DORMANT;
 374         else if (link_has_carrier(link)) {
 375                 if (link_is_enslaved(link))
 376                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
 377                 else
 378                         carrier_state = LINK_CARRIER_STATE_CARRIER;
 379         } else if (link->flags & IFF_UP)
 380                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
 381         else
 382                 carrier_state = LINK_CARRIER_STATE_OFF;
 383
 384         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
 385                 Link *slave;
 386
 387                 SET_FOREACH(slave, link->slaves, i) {
 388                         link_update_operstate(slave, false);
 389
 390                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
 391                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
 392                 }
 393         }
 394
 395         SET_FOREACH(address, link->addresses, i) {
 396                 if (!address_is_ready(address))
 397                         continue;
 398
 399                 if (address->scope < scope)
 400                         scope = address->scope;
 401         }
 402
 403         /* for operstate we also take foreign addresses into account */
 404         SET_FOREACH(address, link->addresses_foreign, i) {
 405                 if (!address_is_ready(address))
 406                         continue;
 407
 408                 if (address->scope < scope)
 409                         scope = address->scope;
 410         }
 411
 412         if (scope < RT_SCOPE_SITE)
 413                 /* universally accessible addresses found */
 414                 address_state = LINK_ADDRESS_STATE_ROUTABLE;
 415         else if (scope < RT_SCOPE_HOST)
 416                 /* only link or site local addresses found */
 417                 address_state = LINK_ADDRESS_STATE_DEGRADED;
 418         else
 419                 /* no useful addresses found */
 420                 address_state = LINK_ADDRESS_STATE_OFF;
 421
 422         /* Mapping of address and carrier state vs operational state
 423          *                                                     carrier state
 424          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 425          *                 ------------------------------------------------------------------------------
 426          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 427          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
 428          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
 429          */
 430
 431         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
 432                 operstate = (LinkOperationalState) carrier_state;
 433         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
 434                 operstate = LINK_OPERSTATE_ROUTABLE;
 435         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
 436                 operstate = LINK_OPERSTATE_DEGRADED;
 437         else
 438                 operstate = LINK_OPERSTATE_ENSLAVED;
 439
 440         if (link->carrier_state != carrier_state) {
 441                 link->carrier_state = carrier_state;
 442                 changed = true;
 443                 if (strv_extend(&p, "CarrierState") < 0)
 444                         log_oom();
 445         }
 446
 447         if (link->address_state != address_state) {
 448                 link->address_state = address_state;
 449                 changed = true;
 450                 if (strv_extend(&p, "AddressState") < 0)
 451                         log_oom();
 452         }
 453
 454         if (link->operstate != operstate) {
 455                 link->operstate = operstate;
 456                 changed = true;
 457                 if (strv_extend(&p, "OperationalState") < 0)
 458                         log_oom();
 459         }
 460
 461         if (p)
 462                 link_send_changed_strv(link, p);
 463         if (changed)
 464                 link_dirty(link);
 465
 466         if (also_update_master && link->network) {
 467                 link_update_master_operstate(link, link->network->bond);
 468                 link_update_master_operstate(link, link->network->bridge);
 469         }
 470 }
 471
 472 #define FLAG_STRING(string, flag, old, new) \
 473         (((old ^ new) & flag) \
 474                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 475                 : "")
 476
 477 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 478         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 479         uint8_t operstate;
 480         int r;
 481
 482         assert(link);
 483
 484         r = sd_rtnl_message_link_get_flags(m, &flags);
 485         if (r < 0)
 486                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 487
 488         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 489         if (r < 0)
 490                 /* if we got a message without operstate, take it to mean
 491                    the state was unchanged */
 492                 operstate = link->kernel_operstate;
 493
 494         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 495                 return 0;
 496
 497         if (link->flags != flags) {
 498                 log_link_debug(link, "Flags change:%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
 499                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 500                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 501                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 502                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 503                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 504                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 505                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 506                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 507                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 508                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 509                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 510                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 511                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 512                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 513                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 514                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 515                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 516                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 517                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 518
 519                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 520                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 521                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 522                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 523                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 524                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 525                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 526                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 527
 528                 /* link flags are currently at most 18 bits, let's align to
 529                  * printing 20 */
 530                 if (unknown_flags_added)
 531                         log_link_debug(link,
 532                                        "Unknown link flags gained: %#.5x (ignoring)",
 533                                        unknown_flags_added);
 534
 535                 if (unknown_flags_removed)
 536                         log_link_debug(link,
 537                                        "Unknown link flags lost: %#.5x (ignoring)",
 538                                        unknown_flags_removed);
 539         }
 540
 541         link->flags = flags;
 542         link->kernel_operstate = operstate;
 543
 544         link_update_operstate(link, true);
 545
 546         return 0;
 547 }
 548
 549 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 550         _cleanup_(link_unrefp) Link *link = NULL;
 551         const char *ifname, *kind = NULL;
 552         unsigned short iftype;
 553         int r, ifindex;
 554         uint16_t type;
 555
 556         assert(manager);
 557         assert(message);
 558         assert(ret);
 559
 560         /* check for link kind */
 561         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 562         if (r == 0) {
 563                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 564                 r = sd_netlink_message_exit_container(message);
 565                 if (r < 0)
 566                         return r;
 567         }
 568
 569         r = sd_netlink_message_get_type(message, &type);
 570         if (r < 0)
 571                 return r;
 572         else if (type != RTM_NEWLINK)
 573                 return -EINVAL;
 574
 575         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 576         if (r < 0)
 577                 return r;
 578         else if (ifindex <= 0)
 579                 return -EINVAL;
 580
 581         r = sd_rtnl_message_link_get_type(message, &iftype);
 582         if (r < 0)
 583                 return r;
 584
 585         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 586         if (r < 0)
 587                 return r;
 588
 589         link = new(Link, 1);
 590         if (!link)
 591                 return -ENOMEM;
 592
 593         *link = (Link) {
 594                 .n_ref = 1,
 595                 .manager = manager,
 596                 .state = LINK_STATE_PENDING,
 597                 .ifindex = ifindex,
 598                 .iftype = iftype,
 599
 600                 .n_dns = (unsigned) -1,
 601                 .dns_default_route = -1,
 602                 .llmnr = _RESOLVE_SUPPORT_INVALID,
 603                 .mdns = _RESOLVE_SUPPORT_INVALID,
 604                 .dnssec_mode = _DNSSEC_MODE_INVALID,
 605                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
 606         };
 607
 608         link->ifname = strdup(ifname);
 609         if (!link->ifname)
 610                 return -ENOMEM;
 611
 612         if (kind) {
 613                 link->kind = strdup(kind);
 614                 if (!link->kind)
 615                         return -ENOMEM;
 616         }
 617
 618         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 619         if (r < 0)
 620                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 621
 622         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 623         if (r < 0)
 624                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 625
 626         r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
 627         if (r < 0)
 628                 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
 629
 630         r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
 631         if (r < 0)
 632                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
 633
 634         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
 635         if (r < 0 && r != -ENODATA)
 636                 return r;
 637
 638         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 639                 return -ENOMEM;
 640
 641         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 642                 return -ENOMEM;
 643
 644         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 645                 return -ENOMEM;
 646
 647         r = hashmap_ensure_allocated(&manager->links, NULL);
 648         if (r < 0)
 649                 return r;
 650
 651         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 652         if (r < 0)
 653                 return r;
 654
 655         r = link_update_flags(link, message, false);
 656         if (r < 0)
 657                 return r;
 658
 659         *ret = TAKE_PTR(link);
 660
 661         return 0;
 662 }
 663
 664 void link_ntp_settings_clear(Link *link) {
 665         link->ntp = strv_free(link->ntp);
 666 }
 667
 668 void link_dns_settings_clear(Link *link) {
 669         if (link->n_dns != (unsigned) -1)
 670                 for (unsigned i = 0; i < link->n_dns; i++)
 671                         in_addr_full_free(link->dns[i]);
 672         link->dns = mfree(link->dns);
 673         link->n_dns = (unsigned) -1;
 674
 675         link->search_domains = ordered_set_free_free(link->search_domains);
 676         link->route_domains = ordered_set_free_free(link->route_domains);
 677
 678         link->dns_default_route = -1;
 679         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 680         link->mdns = _RESOLVE_SUPPORT_INVALID;
 681         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 682         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 683
 684         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 685 }
 686
 687 static void link_free_engines(Link *link) {
 688         if (!link)
 689                 return;
 690
 691         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 692         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 693         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 694
 695         link->lldp = sd_lldp_unref(link->lldp);
 696
 697         ndisc_flush(link);
 698
 699         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 700         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 701         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 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         link->dhcp_routes = set_free(link->dhcp_routes);
 717         link->dhcp_routes_old = set_free(link->dhcp_routes_old);
 718         link->dhcp6_routes = set_free(link->dhcp6_routes);
 719         link->dhcp6_routes_old = set_free(link->dhcp6_routes_old);
 720         link->dhcp6_pd_routes = set_free(link->dhcp6_pd_routes);
 721         link->dhcp6_pd_routes_old = set_free(link->dhcp6_pd_routes_old);
 722         link->ndisc_routes = set_free(link->ndisc_routes);
 723         link->ndisc_routes_old = set_free(link->ndisc_routes_old);
 724
 725         link->nexthops = set_free(link->nexthops);
 726         link->nexthops_foreign = set_free(link->nexthops_foreign);
 727
 728         link->neighbors = set_free(link->neighbors);
 729         link->neighbors_foreign = set_free(link->neighbors_foreign);
 730
 731         link->addresses = set_free(link->addresses);
 732         link->addresses_foreign = set_free(link->addresses_foreign);
 733         link->dhcp6_addresses = set_free(link->dhcp6_addresses);
 734         link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old);
 735         link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses);
 736         link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old);
 737         link->ndisc_addresses = set_free(link->ndisc_addresses);
 738         link->ndisc_addresses_old = set_free(link->ndisc_addresses_old);
 739
 740         while ((address = link->pool_addresses)) {
 741                 LIST_REMOVE(addresses, link->pool_addresses, address);
 742                 address_free(address);
 743         }
 744
 745         link_lldp_emit_stop(link);
 746         link_free_engines(link);
 747         free(link->lease_file);
 748         free(link->lldp_file);
 749
 750         free(link->ifname);
 751         strv_free(link->alternative_names);
 752         free(link->kind);
 753         free(link->ssid);
 754         free(link->driver);
 755
 756         (void) unlink(link->state_file);
 757         free(link->state_file);
 758
 759         sd_device_unref(link->sd_device);
 760
 761         hashmap_free(link->bound_to_links);
 762         hashmap_free(link->bound_by_links);
 763
 764         set_free_with_destructor(link->slaves, link_unref);
 765
 766         network_unref(link->network);
 767
 768         return mfree(link);
 769 }
 770
 771 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 772
 773 int link_get(Manager *m, int ifindex, Link **ret) {
 774         Link *link;
 775
 776         assert(m);
 777         assert(ifindex > 0);
 778         assert(ret);
 779
 780         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 781         if (!link)
 782                 return -ENODEV;
 783
 784         *ret = link;
 785
 786         return 0;
 787 }
 788
 789 void link_set_state(Link *link, LinkState state) {
 790         assert(link);
 791
 792         if (link->state == state)
 793                 return;
 794
 795         log_link_debug(link, "State changed: %s -> %s",
 796                        link_state_to_string(link->state),
 797                        link_state_to_string(state));
 798
 799         link->state = state;
 800
 801         link_send_changed(link, "AdministrativeState", NULL);
 802 }
 803
 804 static void link_enter_unmanaged(Link *link) {
 805         assert(link);
 806
 807         link_set_state(link, LINK_STATE_UNMANAGED);
 808
 809         link_dirty(link);
 810 }
 811
 812 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 813         int r = 0, k;
 814         Address *ad;
 815
 816         assert(link);
 817         assert(link->manager);
 818         assert(link->manager->event);
 819
 820         bool keep_dhcp = may_keep_dhcp &&
 821                          link->network &&
 822                          (link->manager->restarting ||
 823                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 824
 825         if (link->dhcp_client && !keep_dhcp) {
 826                 k = sd_dhcp_client_stop(link->dhcp_client);
 827                 if (k < 0)
 828                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 829         }
 830
 831         if (link->ipv4ll) {
 832                 k = sd_ipv4ll_stop(link->ipv4ll);
 833                 if (k < 0)
 834                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 835         }
 836
 837         if (link->network)
 838                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 839                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 840                                 k = sd_ipv4acd_stop(ad->acd);
 841                                 if (k < 0)
 842                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 843                         }
 844
 845         if (link->dhcp6_client) {
 846                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 847                 if (k < 0)
 848                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 849         }
 850
 851         if (link_dhcp6_pd_is_enabled(link)) {
 852                 k = dhcp6_pd_remove(link);
 853                 if (k < 0)
 854                         r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 855         }
 856
 857         if (link->ndisc) {
 858                 k = sd_ndisc_stop(link->ndisc);
 859                 if (k < 0)
 860                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 861         }
 862
 863         if (link->radv) {
 864                 k = sd_radv_stop(link->radv);
 865                 if (k < 0)
 866                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 867         }
 868
 869         link_lldp_emit_stop(link);
 870         return r;
 871 }
 872
 873 void link_enter_failed(Link *link) {
 874         assert(link);
 875
 876         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 877                 return;
 878
 879         log_link_warning(link, "Failed");
 880
 881         link_set_state(link, LINK_STATE_FAILED);
 882
 883         link_stop_clients(link, false);
 884
 885         link_dirty(link);
 886 }
 887
 888 static int link_join_netdevs_after_configured(Link *link) {
 889         NetDev *netdev;
 890         Iterator i;
 891         int r;
 892
 893         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 894                 if (netdev->ifindex > 0)
 895                         /* Assume already enslaved. */
 896                         continue;
 897
 898                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 899                         continue;
 900
 901                 log_struct(LOG_DEBUG,
 902                            LOG_LINK_INTERFACE(link),
 903                            LOG_NETDEV_INTERFACE(netdev),
 904                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 905
 906                 r = netdev_join(netdev, link, NULL);
 907                 if (r < 0)
 908                         return log_struct_errno(LOG_WARNING, r,
 909                                                 LOG_LINK_INTERFACE(link),
 910                                                 LOG_NETDEV_INTERFACE(netdev),
 911                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 912         }
 913
 914         return 0;
 915 }
 916
 917 static void link_enter_configured(Link *link) {
 918         assert(link);
 919         assert(link->network);
 920
 921         if (link->state != LINK_STATE_CONFIGURING)
 922                 return;
 923
 924         link_set_state(link, LINK_STATE_CONFIGURED);
 925
 926         (void) link_join_netdevs_after_configured(link);
 927
 928         link_dirty(link);
 929 }
 930
 931 static int link_request_set_routing_policy_rule(Link *link) {
 932         RoutingPolicyRule *rule, *rrule = NULL;
 933         int r;
 934
 935         assert(link);
 936         assert(link->network);
 937
 938         link->routing_policy_rules_configured = false;
 939
 940         LIST_FOREACH(rules, rule, link->network->rules) {
 941                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 942                 if (r >= 0) {
 943                         if (r == 0)
 944                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 945                         continue;
 946                 }
 947
 948                 r = routing_policy_rule_configure(rule, link, NULL);
 949                 if (r < 0)
 950                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 951                 if (r > 0)
 952                         link->routing_policy_rule_messages++;
 953         }
 954
 955         routing_policy_rule_purge(link->manager, link);
 956         if (link->routing_policy_rule_messages == 0)
 957                 link->routing_policy_rules_configured = true;
 958         else {
 959                 log_link_debug(link, "Setting routing policy rules");
 960                 link_set_state(link, LINK_STATE_CONFIGURING);
 961         }
 962
 963         return 0;
 964 }
 965
 966 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 967         int r;
 968
 969         assert(link);
 970         assert(link->nexthop_messages > 0);
 971         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 972                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 973
 974         link->nexthop_messages--;
 975
 976         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 977                 return 1;
 978
 979         r = sd_netlink_message_get_errno(m);
 980         if (r < 0 && r != -EEXIST) {
 981                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 982                 link_enter_failed(link);
 983                 return 1;
 984         }
 985
 986         if (link->nexthop_messages == 0) {
 987                 log_link_debug(link, "Nexthop set");
 988                 link->static_nexthops_configured = true;
 989                 link_check_ready(link);
 990         }
 991
 992         return 1;
 993 }
 994
 995 static int link_request_set_nexthop(Link *link) {
 996         NextHop *nh;
 997         int r;
 998
 999         link->static_nexthops_configured = false;
1000
1001         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
1002                 r = nexthop_configure(nh, link, nexthop_handler);
1003                 if (r < 0)
1004                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
1005                 if (r > 0)
1006                         link->nexthop_messages++;
1007         }
1008
1009         if (link->nexthop_messages == 0) {
1010                 link->static_nexthops_configured = true;
1011                 link_check_ready(link);
1012         } else {
1013                 log_link_debug(link, "Setting nexthop");
1014                 link_set_state(link, LINK_STATE_CONFIGURING);
1015         }
1016
1017         return 1;
1018 }
1019
1020 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1021         int r;
1022
1023         assert(link);
1024         assert(link->route_messages > 0);
1025         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1026                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1027
1028         link->route_messages--;
1029
1030         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1031                 return 1;
1032
1033         r = sd_netlink_message_get_errno(m);
1034         if (r < 0 && r != -EEXIST) {
1035                 log_link_message_warning_errno(link, m, r, "Could not set route");
1036                 link_enter_failed(link);
1037                 return 1;
1038         }
1039
1040         if (link->route_messages == 0) {
1041                 log_link_debug(link, "Routes set");
1042                 link->static_routes_configured = true;
1043                 link_request_set_nexthop(link);
1044         }
1045
1046         return 1;
1047 }
1048
1049 int link_request_set_routes(Link *link) {
1050         enum {
1051                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1052                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1053                 _PHASE_MAX
1054         } phase;
1055         Route *rt;
1056         int r;
1057
1058         assert(link);
1059         assert(link->network);
1060         assert(link->addresses_configured);
1061         assert(link->address_messages == 0);
1062         assert(link->state != _LINK_STATE_INVALID);
1063
1064         link->static_routes_configured = false;
1065
1066         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1067                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1068                  * the addresses now, let's not configure the routes either. */
1069                 return 0;
1070
1071         r = link_request_set_routing_policy_rule(link);
1072         if (r < 0)
1073                 return r;
1074
1075         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1076         for (phase = 0; phase < _PHASE_MAX; phase++)
1077                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1078                         if (rt->gateway_from_dhcp)
1079                                 continue;
1080
1081                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1082                                 continue;
1083
1084                         r = route_configure(rt, link, route_handler, NULL);
1085                         if (r < 0)
1086                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1087                         if (r > 0)
1088                                 link->route_messages++;
1089                 }
1090
1091         if (link->route_messages == 0) {
1092                 link->static_routes_configured = true;
1093                 link_request_set_nexthop(link);
1094         } else {
1095                 log_link_debug(link, "Setting routes");
1096                 link_set_state(link, LINK_STATE_CONFIGURING);
1097         }
1098
1099         return 0;
1100 }
1101
1102 void link_check_ready(Link *link) {
1103         Address *a;
1104         Iterator i;
1105         int r;
1106
1107         assert(link);
1108
1109         if (link->state == LINK_STATE_CONFIGURED)
1110                 return;
1111
1112         if (link->state != LINK_STATE_CONFIGURING) {
1113                 log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
1114                 return;
1115         }
1116
1117         if (!link->network)
1118                 return;
1119
1120         if (!link->addresses_configured) {
1121                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1122                 return;
1123         }
1124
1125         if (!link->neighbors_configured) {
1126                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1127                 return;
1128         }
1129
1130         SET_FOREACH(a, link->addresses, i)
1131                 if (!address_is_ready(a)) {
1132                         _cleanup_free_ char *str = NULL;
1133
1134                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1135                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1136                         return;
1137                 }
1138
1139         if (!link->addresses_ready) {
1140                 link->addresses_ready = true;
1141                 r = link_request_set_routes(link);
1142                 if (r < 0)
1143                         link_enter_failed(link);
1144                 log_link_debug(link, "%s(): static addresses are configured. Configuring static routes.", __func__);
1145                 return;
1146         }
1147
1148         if (!link->static_routes_configured) {
1149                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1150                 return;
1151         }
1152
1153         if (!link->static_nexthops_configured) {
1154                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1155                 return;
1156         }
1157
1158         if (!link->routing_policy_rules_configured) {
1159                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1160                 return;
1161         }
1162
1163         if (!link->tc_configured) {
1164                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1165                 return;
1166         }
1167
1168         if (!link->sr_iov_configured) {
1169                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1170                 return;
1171         }
1172
1173         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1174
1175                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address_configured) {
1176                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1177                         return;
1178                 }
1179
1180                 if (link_ipv6ll_enabled(link) &&
1181                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1182                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1183                         return;
1184                 }
1185
1186                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1187                     !link->dhcp_address && set_isempty(link->dhcp6_addresses) && set_isempty(link->ndisc_addresses) &&
1188                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) {
1189                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no dynamic address is assigned yet.", __func__);
1190                         return;
1191                 }
1192
1193                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) || link_ipv6_accept_ra_enabled(link)) {
1194                         if (!link->dhcp4_configured &&
1195                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1196                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1197                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1198                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) {
1199                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1200                                  * an IPv4ll fallback address must be configured. */
1201                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1202                                 return;
1203                         }
1204
1205                         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",
1206                                        __func__,
1207                                        yes_no(link->dhcp4_configured),
1208                                        yes_no(link->dhcp6_address_configured),
1209                                        yes_no(link->dhcp6_route_configured),
1210                                        yes_no(link->dhcp6_pd_address_configured),
1211                                        yes_no(link->dhcp6_pd_route_configured),
1212                                        yes_no(link->ndisc_addresses_configured),
1213                                        yes_no(link->ndisc_routes_configured));
1214                 }
1215         }
1216
1217         link_enter_configured(link);
1218
1219         return;
1220 }
1221
1222 static int link_request_set_neighbors(Link *link) {
1223         Neighbor *neighbor;
1224         int r;
1225
1226         assert(link);
1227         assert(link->network);
1228         assert(link->state != _LINK_STATE_INVALID);
1229
1230         link->neighbors_configured = false;
1231
1232         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1233                 r = neighbor_configure(neighbor, link, NULL);
1234                 if (r < 0)
1235                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1236         }
1237
1238         if (link->neighbor_messages == 0) {
1239                 link->neighbors_configured = true;
1240                 link_check_ready(link);
1241         } else {
1242                 log_link_debug(link, "Setting neighbors");
1243                 link_set_state(link, LINK_STATE_CONFIGURING);
1244         }
1245
1246         return 0;
1247 }
1248
1249 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1250         int r;
1251
1252         assert(rtnl);
1253         assert(m);
1254         assert(link);
1255         assert(link->ifname);
1256         assert(link->address_messages > 0);
1257         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1258                LINK_STATE_FAILED, LINK_STATE_LINGER));
1259
1260         link->address_messages--;
1261
1262         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1263                 return 1;
1264
1265         r = sd_netlink_message_get_errno(m);
1266         if (r < 0 && r != -EEXIST) {
1267                 log_link_message_warning_errno(link, m, r, "Could not set address");
1268                 link_enter_failed(link);
1269                 return 1;
1270         } else if (r >= 0)
1271                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1272
1273         if (link->address_messages == 0) {
1274                 log_link_debug(link, "Addresses set");
1275                 link->addresses_configured = true;
1276                 link_check_ready(link);
1277         }
1278
1279         return 1;
1280 }
1281
1282 static int link_set_bridge_fdb(Link *link) {
1283         FdbEntry *fdb_entry;
1284         int r;
1285
1286         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1287                 r = fdb_entry_configure(link, fdb_entry);
1288                 if (r < 0)
1289                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1290         }
1291
1292         return 0;
1293 }
1294
1295 static int link_request_set_addresses(Link *link) {
1296         AddressLabel *label;
1297         Address *ad;
1298         Prefix *p;
1299         int r;
1300
1301         assert(link);
1302         assert(link->network);
1303         assert(link->state != _LINK_STATE_INVALID);
1304
1305         /* Reset all *_configured flags we are configuring. */
1306         link->addresses_configured = false;
1307         link->addresses_ready = false;
1308         link->neighbors_configured = false;
1309         link->static_routes_configured = false;
1310         link->static_nexthops_configured = false;
1311         link->routing_policy_rules_configured = false;
1312
1313         r = link_set_bridge_fdb(link);
1314         if (r < 0)
1315                 return r;
1316
1317         r = link_request_set_neighbors(link);
1318         if (r < 0)
1319                 return r;
1320
1321         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1322                 bool update;
1323
1324                 if (ad->family == AF_INET6 && !in_addr_is_null(ad->family, &ad->in_addr_peer))
1325                         update = address_get(link, ad->family, &ad->in_addr_peer, ad->prefixlen, NULL) > 0;
1326                 else
1327                         update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1328
1329                 r = address_configure(ad, link, address_handler, update, NULL);
1330                 if (r < 0)
1331                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1332                 if (r > 0)
1333                         link->address_messages++;
1334         }
1335
1336         if (IN_SET(link->network->router_prefix_delegation,
1337                    RADV_PREFIX_DELEGATION_STATIC,
1338                    RADV_PREFIX_DELEGATION_BOTH))
1339                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1340                         _cleanup_(address_freep) Address *address = NULL;
1341
1342                         if (!p->assign)
1343                                 continue;
1344
1345                         r = address_new(&address);
1346                         if (r < 0)
1347                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1348
1349                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1350                         if (r < 0)
1351                                 return r;
1352
1353                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1354                         if (r < 0)
1355                                 return r;
1356
1357                         address->family = AF_INET6;
1358                         r = address_configure(address, link, address_handler, true, NULL);
1359                         if (r < 0)
1360                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1361                         if (r > 0)
1362                                 link->address_messages++;
1363                 }
1364
1365         LIST_FOREACH(labels, label, link->network->address_labels) {
1366                 r = address_label_configure(label, link, NULL, false);
1367                 if (r < 0)
1368                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1369
1370                 link->address_label_messages++;
1371         }
1372
1373         /* now that we can figure out a default address for the dhcp server,
1374            start it */
1375         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1376                 r = dhcp4_server_configure(link);
1377                 if (r < 0)
1378                         return r;
1379                 log_link_debug(link, "Offering DHCPv4 leases");
1380         }
1381
1382         if (link->address_messages == 0) {
1383                 link->addresses_configured = true;
1384                 link_check_ready(link);
1385         } else {
1386                 log_link_debug(link, "Setting addresses");
1387                 link_set_state(link, LINK_STATE_CONFIGURING);
1388         }
1389
1390         return 0;
1391 }
1392
1393 static int link_set_bridge_vlan(Link *link) {
1394         int r;
1395
1396         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1397         if (r < 0)
1398                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1399
1400         return r;
1401 }
1402
1403 static int link_set_proxy_arp(Link *link) {
1404         int r;
1405
1406         if (!link_proxy_arp_enabled(link))
1407                 return 0;
1408
1409         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1410         if (r < 0)
1411                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1412
1413         return 0;
1414 }
1415
1416 static int link_configure_continue(Link *link);
1417
1418 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1419         int r;
1420
1421         assert(m);
1422         assert(link);
1423         assert(link->ifname);
1424
1425         link->setting_mtu = false;
1426
1427         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1428                 return 1;
1429
1430         r = sd_netlink_message_get_errno(m);
1431         if (r < 0)
1432                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1433         else
1434                 log_link_debug(link, "Setting MTU done.");
1435
1436         if (link->state == LINK_STATE_INITIALIZED) {
1437                 r = link_configure_continue(link);
1438                 if (r < 0)
1439                         link_enter_failed(link);
1440         }
1441
1442         return 1;
1443 }
1444
1445 int link_set_mtu(Link *link, uint32_t mtu) {
1446         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1447         int r;
1448
1449         assert(link);
1450         assert(link->manager);
1451         assert(link->manager->rtnl);
1452
1453         if (mtu == 0 || link->setting_mtu)
1454                 return 0;
1455
1456         if (link->mtu == mtu)
1457                 return 0;
1458
1459         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1460
1461         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1462         if (r < 0)
1463                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1464
1465         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1466          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1467         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1468
1469                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1470                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1471
1472                 mtu = IPV6_MIN_MTU;
1473         }
1474
1475         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1476         if (r < 0)
1477                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1478
1479         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1480                                link_netlink_destroy_callback, link);
1481         if (r < 0)
1482                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1483
1484         link_ref(link);
1485         link->setting_mtu = true;
1486
1487         return 0;
1488 }
1489
1490 static bool link_reduces_vlan_mtu(Link *link) {
1491         /* See netif_reduces_vlan_mtu() in kernel. */
1492         return streq_ptr(link->kind, "macsec");
1493 }
1494
1495 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1496         uint32_t mtu = 0;
1497         NetDev *dev;
1498         Iterator i;
1499
1500         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1501                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1502                         /* See vlan_dev_change_mtu() in kernel. */
1503                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1504
1505                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1506                         /* See macvlan_change_mtu() in kernel. */
1507                         mtu = dev->mtu;
1508
1509         return mtu;
1510 }
1511
1512 static int link_configure_mtu(Link *link) {
1513         uint32_t mtu;
1514
1515         assert(link);
1516         assert(link->network);
1517
1518         if (link->network->mtu > 0)
1519                 return link_set_mtu(link, link->network->mtu);
1520
1521         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1522         if (link->mtu >= mtu)
1523                 return 0;
1524
1525         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1526                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1527                         link->mtu, mtu);
1528
1529         return link_set_mtu(link, mtu);
1530 }
1531
1532 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1533         int r;
1534
1535         assert(m);
1536         assert(link);
1537         assert(link->ifname);
1538
1539         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1540                 return 1;
1541
1542         r = sd_netlink_message_get_errno(m);
1543         if (r < 0)
1544                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1545
1546         return 1;
1547 }
1548
1549 static int link_set_flags(Link *link) {
1550         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1551         unsigned ifi_change = 0;
1552         unsigned ifi_flags = 0;
1553         int r;
1554
1555         assert(link);
1556         assert(link->manager);
1557         assert(link->manager->rtnl);
1558
1559         if (link->flags & IFF_LOOPBACK)
1560                 return 0;
1561
1562         if (!link->network)
1563                 return 0;
1564
1565         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1566                 return 0;
1567
1568         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1569         if (r < 0)
1570                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1571
1572         if (link->network->arp >= 0) {
1573                 ifi_change |= IFF_NOARP;
1574                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1575         }
1576
1577         if (link->network->multicast >= 0) {
1578                 ifi_change |= IFF_MULTICAST;
1579                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1580         }
1581
1582         if (link->network->allmulticast >= 0) {
1583                 ifi_change |= IFF_ALLMULTI;
1584                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1585         }
1586
1587         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1588         if (r < 0)
1589                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1590
1591         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1592                                link_netlink_destroy_callback, link);
1593         if (r < 0)
1594                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1595
1596         link_ref(link);
1597
1598         return 0;
1599 }
1600
1601 static int link_acquire_ipv6_conf(Link *link) {
1602         int r;
1603
1604         assert(link);
1605
1606         if (link_ipv6_accept_ra_enabled(link)) {
1607                 assert(link->ndisc);
1608
1609                 log_link_debug(link, "Discovering IPv6 routers");
1610
1611                 r = sd_ndisc_start(link->ndisc);
1612                 if (r < 0 && r != -EBUSY)
1613                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1614         }
1615
1616         if (link_radv_enabled(link)) {
1617                 assert(link->radv);
1618                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1619
1620                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1621
1622                 r = radv_emit_dns(link);
1623                 if (r < 0)
1624                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1625
1626                 r = sd_radv_start(link->radv);
1627                 if (r < 0 && r != -EBUSY)
1628                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1629         }
1630
1631         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1632                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1633                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1634                 assert(link->dhcp6_client);
1635                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1636
1637                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1638                 if (r < 0 && r != -EBUSY)
1639                         return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1640                 else
1641                         log_link_debug(link, "Acquiring DHCPv6 lease");
1642         }
1643
1644         r = dhcp6_request_prefix_delegation(link);
1645         if (r < 0)
1646                 return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m");
1647
1648         return 0;
1649 }
1650
1651 static int link_acquire_ipv4_conf(Link *link) {
1652         int r;
1653
1654         assert(link);
1655         assert(link->manager);
1656         assert(link->manager->event);
1657
1658         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1659                 assert(link->ipv4ll);
1660
1661                 log_link_debug(link, "Acquiring IPv4 link-local address");
1662
1663                 r = sd_ipv4ll_start(link->ipv4ll);
1664                 if (r < 0)
1665                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1666         }
1667
1668         if (link_dhcp4_enabled(link)) {
1669                 assert(link->dhcp_client);
1670
1671                 log_link_debug(link, "Acquiring DHCPv4 lease");
1672
1673                 r = sd_dhcp_client_start(link->dhcp_client);
1674                 if (r < 0)
1675                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1676         }
1677
1678         return 0;
1679 }
1680
1681 static int link_acquire_conf(Link *link) {
1682         int r;
1683
1684         assert(link);
1685
1686         r = link_acquire_ipv4_conf(link);
1687         if (r < 0)
1688                 return r;
1689
1690         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1691                 r = link_acquire_ipv6_conf(link);
1692                 if (r < 0)
1693                         return r;
1694         }
1695
1696         if (link_lldp_emit_enabled(link)) {
1697                 r = link_lldp_emit_start(link);
1698                 if (r < 0)
1699                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1700         }
1701
1702         return 0;
1703 }
1704
1705 bool link_has_carrier(Link *link) {
1706         /* see Documentation/networking/operstates.txt in the kernel sources */
1707
1708         if (link->kernel_operstate == IF_OPER_UP)
1709                 return true;
1710
1711         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1712                 /* operstate may not be implemented, so fall back to flags */
1713                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1714                     !FLAGS_SET(link->flags, IFF_DORMANT))
1715                         return true;
1716
1717         return false;
1718 }
1719
1720 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1721         int r;
1722
1723         assert(link);
1724
1725         link->setting_genmode = false;
1726
1727         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1728                 return 1;
1729
1730         r = sd_netlink_message_get_errno(m);
1731         if (r < 0)
1732                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1733         else
1734                 log_link_debug(link, "Setting address genmode done.");
1735
1736         if (link->state == LINK_STATE_INITIALIZED) {
1737                 r = link_configure_continue(link);
1738                 if (r < 0)
1739                         link_enter_failed(link);
1740         }
1741
1742         return 1;
1743 }
1744
1745 static int link_configure_addrgen_mode(Link *link) {
1746         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1747         uint8_t ipv6ll_mode;
1748         int r;
1749
1750         assert(link);
1751         assert(link->network);
1752         assert(link->manager);
1753         assert(link->manager->rtnl);
1754
1755         if (!socket_ipv6_is_supported() || link->setting_genmode)
1756                 return 0;
1757
1758         log_link_debug(link, "Setting address genmode for link");
1759
1760         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1761         if (r < 0)
1762                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1763
1764         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1765         if (r < 0)
1766                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1767
1768         r = sd_netlink_message_open_container(req, AF_INET6);
1769         if (r < 0)
1770                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1771
1772         if (!link_ipv6ll_enabled(link))
1773                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1774         else if (link->network->ipv6ll_address_gen_mode < 0) {
1775                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1776                 if (r < 0) {
1777                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1778                          * reading the file fails with EIO. */
1779                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1780
1781                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1782                 } else
1783                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1784         } else
1785                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1786
1787         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1788         if (r < 0)
1789                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1790
1791         r = sd_netlink_message_close_container(req);
1792         if (r < 0)
1793                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1794
1795         r = sd_netlink_message_close_container(req);
1796         if (r < 0)
1797                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1798
1799         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1800                                link_netlink_destroy_callback, link);
1801         if (r < 0)
1802                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1803
1804         link_ref(link);
1805         link->setting_genmode = true;
1806
1807         return 0;
1808 }
1809
1810 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1811         int r;
1812
1813         assert(link);
1814
1815         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1816                 return 1;
1817
1818         r = sd_netlink_message_get_errno(m);
1819         if (r < 0)
1820                 /* we warn but don't fail the link, as it may be brought up later */
1821                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1822
1823         return 1;
1824 }
1825
1826 static int link_up(Link *link) {
1827         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1828         int r;
1829
1830         assert(link);
1831         assert(link->network);
1832         assert(link->manager);
1833         assert(link->manager->rtnl);
1834
1835         log_link_debug(link, "Bringing link up");
1836
1837         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1838         if (r < 0)
1839                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1840
1841         /* set it free if not enslaved with networkd */
1842         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1843                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1844                 if (r < 0)
1845                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1846         }
1847
1848         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1849         if (r < 0)
1850                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1851
1852         if (link->network->mac) {
1853                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1854                 if (r < 0)
1855                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1856         }
1857
1858         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1859                                link_netlink_destroy_callback, link);
1860         if (r < 0)
1861                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1862
1863         link_ref(link);
1864
1865         return 0;
1866 }
1867
1868 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1869         int r;
1870
1871         assert(link);
1872
1873         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1874                 return 1;
1875
1876         r = sd_netlink_message_get_errno(m);
1877         if (r < 0)
1878                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1879
1880         return 1;
1881 }
1882
1883 int link_down(Link *link, link_netlink_message_handler_t callback) {
1884         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1885         int r;
1886
1887         assert(link);
1888         assert(link->manager);
1889         assert(link->manager->rtnl);
1890
1891         log_link_debug(link, "Bringing link down");
1892
1893         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1894                                      RTM_SETLINK, link->ifindex);
1895         if (r < 0)
1896                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1897
1898         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1899         if (r < 0)
1900                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1901
1902         r = netlink_call_async(link->manager->rtnl, NULL, req,
1903                                callback ?: link_down_handler,
1904                                link_netlink_destroy_callback, link);
1905         if (r < 0)
1906                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1907
1908         link_ref(link);
1909
1910         return 0;
1911 }
1912
1913 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1914         int r;
1915
1916         assert(link);
1917
1918         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1919                 return 1;
1920
1921         r = sd_netlink_message_get_errno(m);
1922         if (r < 0)
1923                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1924
1925         return 1;
1926 }
1927
1928 static int link_set_group(Link *link) {
1929         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1930         int r;
1931
1932         assert(link);
1933         assert(link->network);
1934         assert(link->manager);
1935         assert(link->manager->rtnl);
1936
1937         if (link->network->group <= 0)
1938                 return 0;
1939
1940         log_link_debug(link, "Setting group");
1941
1942         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1943         if (r < 0)
1944                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1945
1946         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1947         if (r < 0)
1948                 return log_link_error_errno(link, r, "Could not set link group: %m");
1949
1950         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
1951                                link_netlink_destroy_callback, link);
1952         if (r < 0)
1953                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1954
1955         link_ref(link);
1956
1957         return 0;
1958 }
1959
1960 static int link_handle_bound_to_list(Link *link) {
1961         Link *l;
1962         Iterator i;
1963         int r;
1964         bool required_up = false;
1965         bool link_is_up = false;
1966
1967         assert(link);
1968
1969         if (hashmap_isempty(link->bound_to_links))
1970                 return 0;
1971
1972         if (link->flags & IFF_UP)
1973                 link_is_up = true;
1974
1975         HASHMAP_FOREACH (l, link->bound_to_links, i)
1976                 if (link_has_carrier(l)) {
1977                         required_up = true;
1978                         break;
1979                 }
1980
1981         if (!required_up && link_is_up) {
1982                 r = link_down(link, NULL);
1983                 if (r < 0)
1984                         return r;
1985         } else if (required_up && !link_is_up) {
1986                 r = link_up(link);
1987                 if (r < 0)
1988                         return r;
1989         }
1990
1991         return 0;
1992 }
1993
1994 static int link_handle_bound_by_list(Link *link) {
1995         Iterator i;
1996         Link *l;
1997         int r;
1998
1999         assert(link);
2000
2001         if (hashmap_isempty(link->bound_by_links))
2002                 return 0;
2003
2004         HASHMAP_FOREACH (l, link->bound_by_links, i) {
2005                 r = link_handle_bound_to_list(l);
2006                 if (r < 0)
2007                         return r;
2008         }
2009
2010         return 0;
2011 }
2012
2013 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2014         int r;
2015
2016         assert(link);
2017         assert(carrier);
2018
2019         if (link == carrier)
2020                 return 0;
2021
2022         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2023                 return 0;
2024
2025         r = hashmap_ensure_allocated(h, NULL);
2026         if (r < 0)
2027                 return r;
2028
2029         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2030         if (r < 0)
2031                 return r;
2032
2033         return 0;
2034 }
2035
2036 static int link_new_bound_by_list(Link *link) {
2037         Manager *m;
2038         Link *carrier;
2039         Iterator i;
2040         int r;
2041         bool list_updated = false;
2042
2043         assert(link);
2044         assert(link->manager);
2045
2046         m = link->manager;
2047
2048         HASHMAP_FOREACH(carrier, m->links, i) {
2049                 if (!carrier->network)
2050                         continue;
2051
2052                 if (strv_isempty(carrier->network->bind_carrier))
2053                         continue;
2054
2055                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2056                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2057                         if (r < 0)
2058                                 return r;
2059
2060                         list_updated = true;
2061                 }
2062         }
2063
2064         if (list_updated)
2065                 link_dirty(link);
2066
2067         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2068                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2069                 if (r < 0)
2070                         return r;
2071
2072                 link_dirty(carrier);
2073         }
2074
2075         return 0;
2076 }
2077
2078 static int link_new_bound_to_list(Link *link) {
2079         Manager *m;
2080         Link *carrier;
2081         Iterator i;
2082         int r;
2083         bool list_updated = false;
2084
2085         assert(link);
2086         assert(link->manager);
2087
2088         if (!link->network)
2089                 return 0;
2090
2091         if (strv_isempty(link->network->bind_carrier))
2092                 return 0;
2093
2094         m = link->manager;
2095
2096         HASHMAP_FOREACH (carrier, m->links, i) {
2097                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2098                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2099                         if (r < 0)
2100                                 return r;
2101
2102                         list_updated = true;
2103                 }
2104         }
2105
2106         if (list_updated)
2107                 link_dirty(link);
2108
2109         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2110                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2111                 if (r < 0)
2112                         return r;
2113
2114                 link_dirty(carrier);
2115         }
2116
2117         return 0;
2118 }
2119
2120 static int link_new_carrier_maps(Link *link) {
2121         int r;
2122
2123         r = link_new_bound_by_list(link);
2124         if (r < 0)
2125                 return r;
2126
2127         r = link_handle_bound_by_list(link);
2128         if (r < 0)
2129                 return r;
2130
2131         r = link_new_bound_to_list(link);
2132         if (r < 0)
2133                 return r;
2134
2135         r = link_handle_bound_to_list(link);
2136         if (r < 0)
2137                 return r;
2138
2139         return 0;
2140 }
2141
2142 static void link_free_bound_to_list(Link *link) {
2143         Link *bound_to;
2144         Iterator i;
2145
2146         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2147                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2148
2149                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2150                         link_dirty(bound_to);
2151         }
2152
2153         return;
2154 }
2155
2156 static void link_free_bound_by_list(Link *link) {
2157         Link *bound_by;
2158         Iterator i;
2159
2160         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2161                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2162
2163                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2164                         link_dirty(bound_by);
2165                         link_handle_bound_to_list(bound_by);
2166                 }
2167         }
2168
2169         return;
2170 }
2171
2172 static void link_free_carrier_maps(Link *link) {
2173         bool list_updated = false;
2174
2175         assert(link);
2176
2177         if (!hashmap_isempty(link->bound_to_links)) {
2178                 link_free_bound_to_list(link);
2179                 list_updated = true;
2180         }
2181
2182         if (!hashmap_isempty(link->bound_by_links)) {
2183                 link_free_bound_by_list(link);
2184                 list_updated = true;
2185         }
2186
2187         if (list_updated)
2188                 link_dirty(link);
2189
2190         return;
2191 }
2192
2193 static int link_append_to_master(Link *link, NetDev *netdev) {
2194         Link *master;
2195         int r;
2196
2197         assert(link);
2198         assert(netdev);
2199
2200         r = link_get(link->manager, netdev->ifindex, &master);
2201         if (r < 0)
2202                 return r;
2203
2204         r = set_ensure_put(&master->slaves, NULL, link);
2205         if (r <= 0)
2206                 return r;
2207
2208         link_ref(link);
2209         return 0;
2210 }
2211
2212 static void link_drop_from_master(Link *link, NetDev *netdev) {
2213         Link *master;
2214
2215         assert(link);
2216
2217         if (!link->manager || !netdev)
2218                 return;
2219
2220         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2221                 return;
2222
2223         link_unref(set_remove(master->slaves, link));
2224 }
2225
2226 static void link_detach_from_manager(Link *link) {
2227         if (!link || !link->manager)
2228                 return;
2229
2230         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2231         link_clean(link);
2232
2233         /* The following must be called at last. */
2234         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2235         link_unref(link);
2236 }
2237
2238 void link_drop(Link *link) {
2239         if (!link || link->state == LINK_STATE_LINGER)
2240                 return;
2241
2242         link_set_state(link, LINK_STATE_LINGER);
2243
2244         link_free_carrier_maps(link);
2245
2246         if (link->network) {
2247                 link_drop_from_master(link, link->network->bridge);
2248                 link_drop_from_master(link, link->network->bond);
2249         }
2250
2251         log_link_debug(link, "Link removed");
2252
2253         (void) unlink(link->state_file);
2254         link_detach_from_manager(link);
2255 }
2256
2257 static int link_joined(Link *link) {
2258         int r;
2259
2260         assert(link);
2261         assert(link->network);
2262
2263         if (!hashmap_isempty(link->bound_to_links)) {
2264                 r = link_handle_bound_to_list(link);
2265                 if (r < 0)
2266                         return r;
2267         } else if (!(link->flags & IFF_UP)) {
2268                 r = link_up(link);
2269                 if (r < 0) {
2270                         link_enter_failed(link);
2271                         return r;
2272                 }
2273         }
2274
2275         if (link->network->bridge) {
2276                 r = link_set_bridge(link);
2277                 if (r < 0)
2278                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2279
2280                 r = link_append_to_master(link, link->network->bridge);
2281                 if (r < 0)
2282                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2283         }
2284
2285         if (link->network->bond) {
2286                 r = link_set_bond(link);
2287                 if (r < 0)
2288                         log_link_error_errno(link, r, "Could not set bond message: %m");
2289
2290                 r = link_append_to_master(link, link->network->bond);
2291                 if (r < 0)
2292                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2293         }
2294
2295         if (link->network->use_br_vlan &&
2296             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2297                 r = link_set_bridge_vlan(link);
2298                 if (r < 0)
2299                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2300         }
2301
2302         /* Skip setting up addresses until it gets carrier,
2303            or it would try to set addresses twice,
2304            which is bad for non-idempotent steps. */
2305         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2306                 return 0;
2307
2308         link_set_state(link, LINK_STATE_CONFIGURING);
2309         return link_request_set_addresses(link);
2310 }
2311
2312 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2313         int r;
2314
2315         assert(link);
2316         assert(link->network);
2317         assert(link->enslaving > 0);
2318
2319         link->enslaving--;
2320
2321         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2322                 return 1;
2323
2324         r = sd_netlink_message_get_errno(m);
2325         if (r < 0 && r != -EEXIST) {
2326                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2327                 link_enter_failed(link);
2328                 return 1;
2329         }
2330
2331         log_link_debug(link, "Joined netdev");
2332
2333         if (link->enslaving == 0) {
2334                 r = link_joined(link);
2335                 if (r < 0)
2336                         link_enter_failed(link);
2337         }
2338
2339         return 1;
2340 }
2341
2342 static int link_enter_join_netdev(Link *link) {
2343         NetDev *netdev;
2344         Iterator i;
2345         int r;
2346
2347         assert(link);
2348         assert(link->network);
2349         assert(link->state == LINK_STATE_INITIALIZED);
2350
2351         link_set_state(link, LINK_STATE_CONFIGURING);
2352
2353         link_dirty(link);
2354         link->enslaving = 0;
2355
2356         if (link->network->bond) {
2357                 if (link->network->bond->state == NETDEV_STATE_READY &&
2358                     link->network->bond->ifindex == link->master_ifindex)
2359                         return link_joined(link);
2360
2361                 log_struct(LOG_DEBUG,
2362                            LOG_LINK_INTERFACE(link),
2363                            LOG_NETDEV_INTERFACE(link->network->bond),
2364                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2365
2366                 link->enslaving++;
2367
2368                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2369                 if (r < 0) {
2370                         log_struct_errno(LOG_WARNING, r,
2371                                          LOG_LINK_INTERFACE(link),
2372                                          LOG_NETDEV_INTERFACE(link->network->bond),
2373                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2374                         link_enter_failed(link);
2375                         return r;
2376                 }
2377         }
2378
2379         if (link->network->bridge) {
2380                 log_struct(LOG_DEBUG,
2381                            LOG_LINK_INTERFACE(link),
2382                            LOG_NETDEV_INTERFACE(link->network->bridge),
2383                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2384
2385                 link->enslaving++;
2386
2387                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2388                 if (r < 0) {
2389                         log_struct_errno(LOG_WARNING, r,
2390                                          LOG_LINK_INTERFACE(link),
2391                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2392                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2393                         link_enter_failed(link);
2394                         return r;
2395                 }
2396         }
2397
2398         if (link->network->vrf) {
2399                 log_struct(LOG_DEBUG,
2400                            LOG_LINK_INTERFACE(link),
2401                            LOG_NETDEV_INTERFACE(link->network->vrf),
2402                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2403
2404                 link->enslaving++;
2405
2406                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2407                 if (r < 0) {
2408                         log_struct_errno(LOG_WARNING, r,
2409                                          LOG_LINK_INTERFACE(link),
2410                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2411                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2412                         link_enter_failed(link);
2413                         return r;
2414                 }
2415         }
2416
2417         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2418
2419                 if (netdev->ifindex > 0)
2420                         /* Assume already enslaved. */
2421                         continue;
2422
2423                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2424                         continue;
2425
2426                 log_struct(LOG_DEBUG,
2427                            LOG_LINK_INTERFACE(link),
2428                            LOG_NETDEV_INTERFACE(netdev),
2429                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2430
2431                 link->enslaving++;
2432
2433                 r = netdev_join(netdev, link, netdev_join_handler);
2434                 if (r < 0) {
2435                         log_struct_errno(LOG_WARNING, r,
2436                                          LOG_LINK_INTERFACE(link),
2437                                          LOG_NETDEV_INTERFACE(netdev),
2438                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2439                         link_enter_failed(link);
2440                         return r;
2441                 }
2442         }
2443
2444         if (link->enslaving == 0)
2445                 return link_joined(link);
2446
2447         return 0;
2448 }
2449
2450 static int link_set_ipv4_forward(Link *link) {
2451         int r;
2452
2453         if (!link_ipv4_forward_enabled(link))
2454                 return 0;
2455
2456         /* We propagate the forwarding flag from one interface to the
2457          * global setting one way. This means: as long as at least one
2458          * interface was configured at any time that had IP forwarding
2459          * enabled the setting will stay on for good. We do this
2460          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2461          * somewhat in sync (see below). */
2462
2463         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2464         if (r < 0)
2465                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2466
2467         return 0;
2468 }
2469
2470 static int link_set_ipv6_forward(Link *link) {
2471         int r;
2472
2473         if (!link_ipv6_forward_enabled(link))
2474                 return 0;
2475
2476         /* On Linux, the IPv6 stack does not know a per-interface
2477          * packet forwarding setting: either packet forwarding is on
2478          * for all, or off for all. We hence don't bother with a
2479          * per-interface setting, but simply propagate the interface
2480          * flag, if it is set, to the global flag, one-way. Note that
2481          * while IPv4 would allow a per-interface flag, we expose the
2482          * same behaviour there and also propagate the setting from
2483          * one to all, to keep things simple (see above). */
2484
2485         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2486         if (r < 0)
2487                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2488
2489         return 0;
2490 }
2491
2492 static int link_set_ipv6_privacy_extensions(Link *link) {
2493         IPv6PrivacyExtensions s;
2494         int r;
2495
2496         s = link_ipv6_privacy_extensions(link);
2497         if (s < 0)
2498                 return 0;
2499
2500         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2501         if (r < 0)
2502                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2503
2504         return 0;
2505 }
2506
2507 static int link_set_ipv6_accept_ra(Link *link) {
2508         int r;
2509
2510         /* Make this a NOP if IPv6 is not available */
2511         if (!socket_ipv6_is_supported())
2512                 return 0;
2513
2514         if (link->flags & IFF_LOOPBACK)
2515                 return 0;
2516
2517         if (!link->network)
2518                 return 0;
2519
2520         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2521         if (r < 0)
2522                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2523
2524         return 0;
2525 }
2526
2527 static int link_set_ipv6_dad_transmits(Link *link) {
2528         int r;
2529
2530         /* Make this a NOP if IPv6 is not available */
2531         if (!socket_ipv6_is_supported())
2532                 return 0;
2533
2534         if (link->flags & IFF_LOOPBACK)
2535                 return 0;
2536
2537         if (!link->network)
2538                 return 0;
2539
2540         if (link->network->ipv6_dad_transmits < 0)
2541                 return 0;
2542
2543         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2544         if (r < 0)
2545                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2546
2547         return 0;
2548 }
2549
2550 static int link_set_ipv6_hop_limit(Link *link) {
2551         int r;
2552
2553         /* Make this a NOP if IPv6 is not available */
2554         if (!socket_ipv6_is_supported())
2555                 return 0;
2556
2557         if (link->flags & IFF_LOOPBACK)
2558                 return 0;
2559
2560         if (!link->network)
2561                 return 0;
2562
2563         if (link->network->ipv6_hop_limit < 0)
2564                 return 0;
2565
2566         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2567         if (r < 0)
2568                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2569
2570         return 0;
2571 }
2572
2573 static int link_set_ipv6_mtu(Link *link) {
2574         int r;
2575
2576         /* Make this a NOP if IPv6 is not available */
2577         if (!socket_ipv6_is_supported())
2578                 return 0;
2579
2580         if (link->flags & IFF_LOOPBACK)
2581                 return 0;
2582
2583         if (link->network->ipv6_mtu == 0)
2584                 return 0;
2585
2586         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2587          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2588         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2589                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2590                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2591         }
2592
2593         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2594         if (r < 0) {
2595                 if (link->mtu < link->network->ipv6_mtu)
2596                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2597                                          link->network->ipv6_mtu, link->mtu);
2598                 else
2599                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2600         }
2601
2602         link->ipv6_mtu_set = true;
2603
2604         return 0;
2605 }
2606
2607 static int link_set_ipv4_accept_local(Link *link) {
2608         int r;
2609
2610         if (link->flags & IFF_LOOPBACK)
2611                 return 0;
2612
2613         if (link->network->ipv4_accept_local < 0)
2614                 return 0;
2615
2616         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2617         if (r < 0)
2618                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2619
2620         return 0;
2621 }
2622
2623 static bool link_is_static_address_configured(Link *link, Address *address) {
2624         Address *net_address;
2625
2626         assert(link);
2627         assert(address);
2628
2629         if (!link->network)
2630                 return false;
2631
2632         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2633                 if (address_equal(net_address, address))
2634                         return true;
2635                 else if (address->family == AF_INET6 && net_address->family == AF_INET6 &&
2636                          in_addr_equal(AF_INET6, &address->in_addr, &net_address->in_addr_peer) > 0)
2637                         return true;
2638
2639         return false;
2640 }
2641
2642 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2643         Neighbor *net_neighbor;
2644
2645         assert(link);
2646         assert(neighbor);
2647
2648         if (!link->network)
2649                 return false;
2650
2651         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2652                 if (neighbor_equal(net_neighbor, neighbor))
2653                         return true;
2654
2655         return false;
2656 }
2657
2658 static bool link_is_static_route_configured(Link *link, Route *route) {
2659         Route *net_route;
2660
2661         assert(link);
2662         assert(route);
2663
2664         if (!link->network)
2665                 return false;
2666
2667         LIST_FOREACH(routes, net_route, link->network->static_routes)
2668                 if (route_equal(net_route, route))
2669                         return true;
2670
2671         return false;
2672 }
2673
2674 static bool link_address_is_dynamic(Link *link, Address *address) {
2675         Route *route;
2676         Iterator i;
2677
2678         assert(link);
2679         assert(address);
2680
2681         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2682                 return true;
2683
2684         /* Even when the address is leased from a DHCP server, networkd assign the address
2685          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2686          * corresponding routes with RTPROT_DHCP. */
2687         SET_FOREACH(route, link->routes_foreign, i) {
2688                 if (route->protocol != RTPROT_DHCP)
2689                         continue;
2690
2691                 if (address->family != route->family)
2692                         continue;
2693
2694                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2695                         return true;
2696         }
2697
2698         return false;
2699 }
2700
2701 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2702         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2703         sd_netlink_message *addr;
2704         int r;
2705
2706         assert(link);
2707         assert(link->manager);
2708         assert(link->manager->rtnl);
2709
2710         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2711         if (r < 0)
2712                 return r;
2713
2714         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2715         if (r < 0)
2716                 return r;
2717
2718         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2719                 unsigned char flags;
2720                 int ifindex;
2721
2722                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2723                 if (r < 0) {
2724                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2725                         continue;
2726                 } else if (link->ifindex != ifindex)
2727                         continue;
2728
2729                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2730                 if (r < 0) {
2731                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2732                         continue;
2733                 } else if (!(flags & IFA_F_TENTATIVE))
2734                         continue;
2735
2736                 log_link_debug(link, "Found tentative ipv6 link-local address");
2737                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2738         }
2739
2740         return 0;
2741 }
2742
2743 static int link_drop_foreign_config(Link *link) {
2744         Address *address;
2745         Neighbor *neighbor;
2746         Route *route;
2747         Iterator i;
2748         int r;
2749
2750         /* The kernel doesn't notify us about tentative addresses;
2751          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2752         if (!link_ipv6ll_enabled(link)) {
2753                 r = link_enumerate_ipv6_tentative_addresses(link);
2754                 if (r < 0)
2755                         return r;
2756         }
2757
2758         SET_FOREACH(address, link->addresses_foreign, i) {
2759                 /* we consider IPv6LL addresses to be managed by the kernel */
2760                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2761                         continue;
2762
2763                 if (link_address_is_dynamic(link, address)) {
2764                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2765                                 continue;
2766                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2767                         continue;
2768
2769                 if (link_is_static_address_configured(link, address)) {
2770                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2771                         if (r < 0)
2772                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2773                 } else {
2774                         r = address_remove(address, link, NULL);
2775                         if (r < 0)
2776                                 return r;
2777                 }
2778         }
2779
2780         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2781                 if (link_is_neighbor_configured(link, neighbor)) {
2782                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2783                         if (r < 0)
2784                                 return r;
2785                 } else {
2786                         r = neighbor_remove(neighbor, link, NULL);
2787                         if (r < 0)
2788                                 return r;
2789                 }
2790         }
2791
2792         SET_FOREACH(route, link->routes_foreign, i) {
2793                 /* do not touch routes managed by the kernel */
2794                 if (route->protocol == RTPROT_KERNEL)
2795                         continue;
2796
2797                 /* do not touch multicast route added by kernel */
2798                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2799                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2800                 if (route->protocol == RTPROT_BOOT &&
2801                     route->family == AF_INET6 &&
2802                     route->dst_prefixlen == 8 &&
2803                     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 }}} }))
2804                         continue;
2805
2806                 if (route->protocol == RTPROT_STATIC && link->network &&
2807                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2808                         continue;
2809
2810                 if (route->protocol == RTPROT_DHCP && link->network &&
2811                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2812                         continue;
2813
2814                 if (link_is_static_route_configured(link, route)) {
2815                         r = route_add(link, route, NULL);
2816                         if (r < 0)
2817                                 return r;
2818                 } else {
2819                         r = route_remove(route, link, NULL);
2820                         if (r < 0)
2821                                 return r;
2822                 }
2823         }
2824
2825         return 0;
2826 }
2827
2828 static int link_drop_config(Link *link) {
2829         Address *address, *pool_address;
2830         Neighbor *neighbor;
2831         Route *route;
2832         Iterator i;
2833         int r;
2834
2835         SET_FOREACH(address, link->addresses, i) {
2836                 /* we consider IPv6LL addresses to be managed by the kernel */
2837                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2838                         continue;
2839
2840                 r = address_remove(address, link, NULL);
2841                 if (r < 0)
2842                         return r;
2843
2844                 /* If this address came from an address pool, clean up the pool */
2845                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2846                         if (address_equal(address, pool_address)) {
2847                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2848                                 address_free(pool_address);
2849                                 break;
2850                         }
2851                 }
2852         }
2853
2854         SET_FOREACH(neighbor, link->neighbors, i) {
2855                 r = neighbor_remove(neighbor, link, NULL);
2856                 if (r < 0)
2857                         return r;
2858         }
2859
2860         SET_FOREACH(route, link->routes, i) {
2861                 /* do not touch routes managed by the kernel */
2862                 if (route->protocol == RTPROT_KERNEL)
2863                         continue;
2864
2865                 r = route_remove(route, link, NULL);
2866                 if (r < 0)
2867                         return r;
2868         }
2869
2870         ndisc_flush(link);
2871
2872         return 0;
2873 }
2874
2875 static int link_configure_ipv4_dad(Link *link) {
2876         Address *address;
2877         int r;
2878
2879         assert(link);
2880         assert(link->network);
2881
2882         LIST_FOREACH(addresses, address, link->network->static_addresses)
2883                 if (address->family == AF_INET &&
2884                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2885                         r = configure_ipv4_duplicate_address_detection(link, address);
2886                         if (r < 0)
2887                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2888                 }
2889
2890         return 0;
2891 }
2892
2893 static int link_configure_traffic_control(Link *link) {
2894         TrafficControl *tc;
2895         Iterator i;
2896         int r;
2897
2898         link->tc_configured = false;
2899         link->tc_messages = 0;
2900
2901         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2902                 r = traffic_control_configure(link, tc);
2903                 if (r < 0)
2904                         return r;
2905         }
2906
2907         if (link->tc_messages == 0)
2908                 link->tc_configured = true;
2909         else
2910                 log_link_debug(link, "Configuring traffic control");
2911
2912         return 0;
2913 }
2914
2915 static int link_configure_sr_iov(Link *link) {
2916         SRIOV *sr_iov;
2917         Iterator i;
2918         int r;
2919
2920         link->sr_iov_configured = false;
2921         link->sr_iov_messages = 0;
2922
2923         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2924                 r = sr_iov_configure(link, sr_iov);
2925                 if (r < 0)
2926                         return r;
2927         }
2928
2929         if (link->sr_iov_messages == 0)
2930                 link->sr_iov_configured = true;
2931         else
2932                 log_link_debug(link, "Configuring SR-IOV");
2933
2934         return 0;
2935 }
2936
2937 static int link_configure(Link *link) {
2938         int r;
2939
2940         assert(link);
2941         assert(link->network);
2942         assert(link->state == LINK_STATE_INITIALIZED);
2943
2944         r = link_configure_traffic_control(link);
2945         if (r < 0)
2946                 return r;
2947
2948         r = link_configure_sr_iov(link);
2949         if (r < 0)
2950                 return r;
2951
2952         if (link->iftype == ARPHRD_CAN)
2953                 return link_configure_can(link);
2954
2955         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2956          * for this interface, then enable IPv6 */
2957         (void) link_update_ipv6_sysctl(link);
2958
2959         r = link_set_proxy_arp(link);
2960         if (r < 0)
2961                return r;
2962
2963         r = ipv6_proxy_ndp_addresses_configure(link);
2964         if (r < 0)
2965                 return r;
2966
2967         r = link_set_ipv4_forward(link);
2968         if (r < 0)
2969                 return r;
2970
2971         r = link_set_ipv6_forward(link);
2972         if (r < 0)
2973                 return r;
2974
2975         r = link_set_ipv6_privacy_extensions(link);
2976         if (r < 0)
2977                 return r;
2978
2979         r = link_set_ipv6_accept_ra(link);
2980         if (r < 0)
2981                 return r;
2982
2983         r = link_set_ipv6_dad_transmits(link);
2984         if (r < 0)
2985                 return r;
2986
2987         r = link_set_ipv6_hop_limit(link);
2988         if (r < 0)
2989                 return r;
2990
2991         r = link_set_ipv4_accept_local(link);
2992         if (r < 0)
2993                 return r;
2994
2995         r = link_set_flags(link);
2996         if (r < 0)
2997                 return r;
2998
2999         r = link_set_group(link);
3000         if (r < 0)
3001                 return r;
3002
3003         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
3004                 r = ipv4ll_configure(link);
3005                 if (r < 0)
3006                         return r;
3007         }
3008
3009         if (link_dhcp4_enabled(link)) {
3010                 r = dhcp4_set_promote_secondaries(link);
3011                 if (r < 0)
3012                         return r;
3013
3014                 r = dhcp4_configure(link);
3015                 if (r < 0)
3016                         return r;
3017         }
3018
3019         if (link_dhcp4_server_enabled(link)) {
3020                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3021                 if (r < 0)
3022                         return r;
3023
3024                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3025                 if (r < 0)
3026                         return r;
3027         }
3028
3029         if (link_dhcp6_enabled(link) ||
3030             link_ipv6_accept_ra_enabled(link)) {
3031                 r = dhcp6_configure(link);
3032                 if (r < 0)
3033                         return r;
3034         }
3035
3036         if (link_ipv6_accept_ra_enabled(link)) {
3037                 r = ndisc_configure(link);
3038                 if (r < 0)
3039                         return r;
3040         }
3041
3042         if (link_radv_enabled(link)) {
3043                 r = radv_configure(link);
3044                 if (r < 0)
3045                         return r;
3046         }
3047
3048         if (link_lldp_rx_enabled(link)) {
3049                 r = link_lldp_rx_configure(link);
3050                 if (r < 0)
3051                         return r;
3052         }
3053
3054         r = link_configure_mtu(link);
3055         if (r < 0)
3056                 return r;
3057
3058         r = link_configure_addrgen_mode(link);
3059         if (r < 0)
3060                 return r;
3061
3062         r = link_configure_ipv4_dad(link);
3063         if (r < 0)
3064                 return r;
3065
3066         return link_configure_continue(link);
3067 }
3068
3069 /* The configuration continues in this separate function, instead of
3070  * including this in the above link_configure() function, for two
3071  * reasons:
3072  * 1) some devices reset the link when the mtu is set, which caused
3073  *    an infinite loop here in networkd; see:
3074  *    https://github.com/systemd/systemd/issues/6593
3075  *    https://github.com/systemd/systemd/issues/9831
3076  * 2) if ipv6ll is disabled, then bringing the interface up must be
3077  *    delayed until after we get confirmation from the kernel that
3078  *    the addr_gen_mode parameter has been set (via netlink), see:
3079  *    https://github.com/systemd/systemd/issues/13882
3080  */
3081 static int link_configure_continue(Link *link) {
3082         int r;
3083
3084         assert(link);
3085         assert(link->network);
3086         assert(link->state == LINK_STATE_INITIALIZED);
3087
3088         if (link->setting_mtu || link->setting_genmode)
3089                 return 0;
3090
3091         /* Drop foreign config, but ignore loopback or critical devices.
3092          * We do not want to remove loopback address or addresses used for root NFS. */
3093         if (!(link->flags & IFF_LOOPBACK) &&
3094             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3095                 r = link_drop_foreign_config(link);
3096                 if (r < 0)
3097                         return r;
3098         }
3099
3100         /* The kernel resets ipv6 mtu after changing device mtu;
3101          * we must set this here, after we've set device mtu */
3102         r = link_set_ipv6_mtu(link);
3103         if (r < 0)
3104                 return r;
3105
3106         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3107                 r = link_acquire_conf(link);
3108                 if (r < 0)
3109                         return r;
3110         }
3111
3112         return link_enter_join_netdev(link);
3113 }
3114
3115 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3116         assert(duid);
3117
3118         if (duid->raw_data_len > 0)
3119                 return 0;
3120
3121         if (duid->type != DUID_TYPE_UUID)
3122                 return -EINVAL;
3123
3124         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3125         duid->raw_data_len = sizeof(sd_id128_t);
3126
3127         return 1;
3128 }
3129
3130 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3131         Manager *manager = userdata;
3132         const sd_bus_error *e;
3133         const void *a;
3134         size_t sz;
3135         DUID *duid;
3136         Link *link;
3137         int r;
3138
3139         assert(m);
3140         assert(manager);
3141
3142         e = sd_bus_message_get_error(m);
3143         if (e) {
3144                 log_error_errno(sd_bus_error_get_errno(e),
3145                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3146                                 e->message);
3147                 goto configure;
3148         }
3149
3150         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3151         if (r < 0)
3152                 goto configure;
3153
3154         if (sz != sizeof(sd_id128_t)) {
3155                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3156                 goto configure;
3157         }
3158
3159         memcpy(&manager->product_uuid, a, sz);
3160         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3161                 (void) duid_set_uuid(duid, manager->product_uuid);
3162
3163         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3164
3165 configure:
3166         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3167                 link_unref(link);
3168
3169                 r = link_configure(link);
3170                 if (r < 0)
3171                         link_enter_failed(link);
3172         }
3173
3174         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3175
3176         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3177          * even if the method fails. */
3178         manager->has_product_uuid = true;
3179
3180         return 1;
3181 }
3182
3183 static bool link_requires_uuid(Link *link) {
3184         const DUID *duid;
3185
3186         assert(link);
3187         assert(link->manager);
3188         assert(link->network);
3189
3190         duid = link_get_duid(link);
3191         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3192                 return false;
3193
3194         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3195                 return true;
3196
3197         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3198                 return true;
3199
3200         return false;
3201 }
3202
3203 static int link_configure_duid(Link *link) {
3204         Manager *m;
3205         DUID *duid;
3206         int r;
3207
3208         assert(link);
3209         assert(link->manager);
3210         assert(link->network);
3211
3212         m = link->manager;
3213         duid = link_get_duid(link);
3214
3215         if (!link_requires_uuid(link))
3216                 return 1;
3217
3218         if (m->has_product_uuid) {
3219                 (void) duid_set_uuid(duid, m->product_uuid);
3220                 return 1;
3221         }
3222
3223         if (!m->links_requesting_uuid) {
3224                 r = manager_request_product_uuid(m, link);
3225                 if (r < 0) {
3226                         if (r == -ENOMEM)
3227                                 return r;
3228
3229                         log_link_warning_errno(link, r,
3230                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3231                         return 1;
3232                 }
3233         } else {
3234                 r = set_put(m->links_requesting_uuid, link);
3235                 if (r < 0)
3236                         return log_oom();
3237                 if (r > 0)
3238                         link_ref(link);
3239
3240                 r = set_put(m->duids_requesting_uuid, duid);
3241                 if (r < 0)
3242                         return log_oom();
3243         }
3244
3245         return 0;
3246 }
3247
3248 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3249         Network *network;
3250         int r;
3251
3252         if (m) {
3253                 _cleanup_strv_free_ char **s = NULL;
3254
3255                 r = sd_netlink_message_get_errno(m);
3256                 if (r < 0)
3257                         return r;
3258
3259                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3260                 if (r < 0 && r != -ENODATA)
3261                         return r;
3262
3263                 strv_free_and_replace(link->alternative_names, s);
3264         }
3265
3266         r = network_get(link->manager, link->iftype, link->sd_device,
3267                         link->ifname, link->alternative_names, link->driver,
3268                         &link->mac, &link->permanent_mac,
3269                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3270         if (r == -ENOENT) {
3271                 link_enter_unmanaged(link);
3272                 return 0;
3273         } else if (r == 0 && network->unmanaged) {
3274                 link_enter_unmanaged(link);
3275                 return 0;
3276         } else if (r < 0)
3277                 return r;
3278
3279         if (link->network == network && !force)
3280                 return 0;
3281
3282         log_link_info(link, "Re-configuring with %s", network->filename);
3283
3284         /* Dropping old .network file */
3285         r = link_stop_clients(link, false);
3286         if (r < 0)
3287                 return r;
3288
3289         if (link_dhcp4_server_enabled(link))
3290                 (void) sd_dhcp_server_stop(link->dhcp_server);
3291
3292         r = link_drop_config(link);
3293         if (r < 0)
3294                 return r;
3295
3296         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3297                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3298                 r = link_drop_foreign_config(link);
3299                 if (r < 0)
3300                         return r;
3301         }
3302
3303         link_free_carrier_maps(link);
3304         link_free_engines(link);
3305         link->network = network_unref(link->network);
3306
3307         /* Then, apply new .network file */
3308         r = network_apply(network, link);
3309         if (r < 0)
3310                 return r;
3311
3312         r = link_new_carrier_maps(link);
3313         if (r < 0)
3314                 return r;
3315
3316         link_set_state(link, LINK_STATE_INITIALIZED);
3317         link_dirty(link);
3318
3319         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3320          * link_configure() is called later asynchronously. */
3321         r = link_configure_duid(link);
3322         if (r <= 0)
3323                 return r;
3324
3325         r = link_configure(link);
3326         if (r < 0)
3327                 return r;
3328
3329         return 0;
3330 }
3331
3332 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3333         int r;
3334
3335         r = link_reconfigure_internal(link, m, false);
3336         if (r < 0)
3337                 link_enter_failed(link);
3338
3339         return 1;
3340 }
3341
3342 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3343         int r;
3344
3345         r = link_reconfigure_internal(link, m, true);
3346         if (r < 0)
3347                 link_enter_failed(link);
3348
3349         return 1;
3350 }
3351
3352 int link_reconfigure(Link *link, bool force) {
3353         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3354         int r;
3355
3356         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3357                 return 0;
3358
3359         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3360                                      link->ifindex);
3361         if (r < 0)
3362                 return r;
3363
3364         r = netlink_call_async(link->manager->rtnl, NULL, req,
3365                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3366                                link_netlink_destroy_callback, link);
3367         if (r < 0)
3368                 return r;
3369
3370         link_ref(link);
3371
3372         return 0;
3373 }
3374
3375 static int link_initialized_and_synced(Link *link) {
3376         Network *network;
3377         int r;
3378
3379         assert(link);
3380         assert(link->ifname);
3381         assert(link->manager);
3382
3383         /* We may get called either from the asynchronous netlink callback,
3384          * or directly for link_add() if running in a container. See link_add(). */
3385         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3386                 return 0;
3387
3388         log_link_debug(link, "Link state is up-to-date");
3389         link_set_state(link, LINK_STATE_INITIALIZED);
3390
3391         r = link_new_bound_by_list(link);
3392         if (r < 0)
3393                 return r;
3394
3395         r = link_handle_bound_by_list(link);
3396         if (r < 0)
3397                 return r;
3398
3399         if (!link->network) {
3400                 r = wifi_get_info(link);
3401                 if (r < 0)
3402                         return r;
3403
3404                 r = network_get(link->manager, link->iftype, link->sd_device,
3405                                 link->ifname, link->alternative_names, link->driver,
3406                                 &link->mac, &link->permanent_mac,
3407                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3408                 if (r == -ENOENT) {
3409                         link_enter_unmanaged(link);
3410                         return 0;
3411                 } else if (r == 0 && network->unmanaged) {
3412                         link_enter_unmanaged(link);
3413                         return 0;
3414                 } else if (r < 0)
3415                         return r;
3416
3417                 if (link->flags & IFF_LOOPBACK) {
3418                         if (network->link_local != ADDRESS_FAMILY_NO)
3419                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3420
3421                         if (network->dhcp != ADDRESS_FAMILY_NO)
3422                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3423
3424                         if (network->dhcp_server)
3425                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3426                 }
3427
3428                 r = network_apply(network, link);
3429                 if (r < 0)
3430                         return r;
3431         }
3432
3433         r = link_new_bound_to_list(link);
3434         if (r < 0)
3435                 return r;
3436
3437         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3438          * link_configure() is called later asynchronously. */
3439         r = link_configure_duid(link);
3440         if (r <= 0)
3441                 return r;
3442
3443         r = link_configure(link);
3444         if (r < 0)
3445                 return r;
3446
3447         return 0;
3448 }
3449
3450 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3451         _cleanup_strv_free_ char **s = NULL;
3452         int r;
3453
3454         r = sd_netlink_message_get_errno(m);
3455         if (r < 0) {
3456                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3457                 link_enter_failed(link);
3458                 return 0;
3459         }
3460
3461         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3462         if (r < 0 && r != -ENODATA) {
3463                 link_enter_failed(link);
3464                 return 0;
3465         }
3466
3467         strv_free_and_replace(link->alternative_names, s);
3468
3469         r = link_initialized_and_synced(link);
3470         if (r < 0)
3471                 link_enter_failed(link);
3472         return 1;
3473 }
3474
3475 int link_initialized(Link *link, sd_device *device) {
3476         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3477         int r;
3478
3479         assert(link);
3480         assert(link->manager);
3481         assert(link->manager->rtnl);
3482         assert(device);
3483
3484         if (link->state != LINK_STATE_PENDING)
3485                 return 0;
3486
3487         if (link->sd_device)
3488                 return 0;
3489
3490         log_link_debug(link, "udev initialized link");
3491         link_set_state(link, LINK_STATE_INITIALIZED);
3492
3493         link->sd_device = sd_device_ref(device);
3494
3495         /* udev has initialized the link, but we don't know if we have yet
3496          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3497          * when it returns we know that the pending NEWLINKs have already been
3498          * processed and that we are up-to-date */
3499
3500         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3501                                      link->ifindex);
3502         if (r < 0)
3503                 return r;
3504
3505         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3506                                link_netlink_destroy_callback, link);
3507         if (r < 0)
3508                 return r;
3509
3510         link_ref(link);
3511
3512         return 0;
3513 }
3514
3515 static int link_load(Link *link) {
3516         _cleanup_free_ char *network_file = NULL,
3517                             *addresses = NULL,
3518                             *routes = NULL,
3519                             *dhcp4_address = NULL,
3520                             *ipv4ll_address = NULL;
3521         union in_addr_union address;
3522         int r;
3523
3524         assert(link);
3525
3526         r = parse_env_file(NULL, link->state_file,
3527                            "NETWORK_FILE", &network_file,
3528                            "ADDRESSES", &addresses,
3529                            "ROUTES", &routes,
3530                            "DHCP4_ADDRESS", &dhcp4_address,
3531                            "IPV4LL_ADDRESS", &ipv4ll_address);
3532         if (r < 0 && r != -ENOENT)
3533                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3534
3535         if (network_file) {
3536                 Network *network;
3537                 char *suffix;
3538
3539                 /* drop suffix */
3540                 suffix = strrchr(network_file, '.');
3541                 if (!suffix) {
3542                         log_link_debug(link, "Failed to get network name from %s", network_file);
3543                         goto network_file_fail;
3544                 }
3545                 *suffix = '\0';
3546
3547                 r = network_get_by_name(link->manager, basename(network_file), &network);
3548                 if (r < 0) {
3549                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3550                         goto network_file_fail;
3551                 }
3552
3553                 r = network_apply(network, link);
3554                 if (r < 0)
3555                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3556         }
3557
3558 network_file_fail:
3559
3560         for (const char *p = addresses; p; ) {
3561                 _cleanup_free_ char *address_str = NULL;
3562                 char *prefixlen_str;
3563                 int family;
3564                 unsigned char prefixlen;
3565
3566                 r = extract_first_word(&p, &address_str, NULL, 0);
3567                 if (r < 0)
3568                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3569                 if (r <= 0)
3570                         break;
3571
3572                 prefixlen_str = strchr(address_str, '/');
3573                 if (!prefixlen_str) {
3574                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3575                         continue;
3576                 }
3577                 *prefixlen_str++ = '\0';
3578
3579                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3580                 if (r != 1) {
3581                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3582                         continue;
3583                 }
3584
3585                 r = in_addr_from_string_auto(address_str, &family, &address);
3586                 if (r < 0) {
3587                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3588                         continue;
3589                 }
3590
3591                 r = address_add(link, family, &address, prefixlen, NULL);
3592                 if (r < 0)
3593                         return log_link_error_errno(link, r, "Failed to add address: %m");
3594         }
3595
3596         for (const char *p = routes; p; ) {
3597                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3598                 _cleanup_(route_freep) Route *tmp = NULL;
3599                 _cleanup_free_ char *route_str = NULL;
3600                 char *prefixlen_str;
3601                 Route *route;
3602
3603                 r = extract_first_word(&p, &route_str, NULL, 0);
3604                 if (r < 0)
3605                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3606                 if (r <= 0)
3607                         break;
3608
3609                 prefixlen_str = strchr(route_str, '/');
3610                 if (!prefixlen_str) {
3611                         log_link_debug(link, "Failed to parse route %s", route_str);
3612                         continue;
3613                 }
3614                 *prefixlen_str++ = '\0';
3615
3616                 r = route_new(&tmp);
3617                 if (r < 0)
3618                         return log_oom();
3619
3620                 r = sscanf(prefixlen_str,
3621                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3622                            &tmp->dst_prefixlen,
3623                            &tmp->tos,
3624                            &tmp->priority,
3625                            &tmp->table,
3626                            &tmp->lifetime);
3627                 if (r != 5) {
3628                         log_link_debug(link,
3629                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3630                                        prefixlen_str);
3631                         continue;
3632                 }
3633
3634                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3635                 if (r < 0) {
3636                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3637                         continue;
3638                 }
3639
3640                 r = route_add(link, tmp, &route);
3641                 if (r < 0)
3642                         return log_link_error_errno(link, r, "Failed to add route: %m");
3643
3644                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3645                         r = sd_event_add_time(link->manager->event, &expire,
3646                                               clock_boottime_or_monotonic(),
3647                                               route->lifetime, 0, route_expire_handler, route);
3648                         if (r < 0)
3649                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3650                 }
3651
3652                 sd_event_source_unref(route->expire);
3653                 route->expire = TAKE_PTR(expire);
3654         }
3655
3656         if (dhcp4_address) {
3657                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3658                 if (r < 0) {
3659                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3660                         goto dhcp4_address_fail;
3661                 }
3662
3663                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3664                 if (r < 0)
3665                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3666
3667                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3668                 if (r < 0)
3669                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3670
3671                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3672                 if (r < 0)
3673                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3674         }
3675
3676 dhcp4_address_fail:
3677
3678         if (ipv4ll_address) {
3679                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3680                 if (r < 0) {
3681                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3682                         goto ipv4ll_address_fail;
3683                 }
3684
3685                 r = sd_ipv4ll_new(&link->ipv4ll);
3686                 if (r < 0)
3687                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3688
3689                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3690                 if (r < 0)
3691                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3692
3693                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3694                 if (r < 0)
3695                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3696         }
3697
3698 ipv4ll_address_fail:
3699
3700         return 0;
3701 }
3702
3703 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3704         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3705         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3706         Link *link;
3707         int r;
3708
3709         assert(m);
3710         assert(m->rtnl);
3711         assert(message);
3712         assert(ret);
3713
3714         r = link_new(m, message, ret);
3715         if (r < 0)
3716                 return r;
3717
3718         link = *ret;
3719
3720         log_link_debug(link, "Link %d added", link->ifindex);
3721
3722         r = link_load(link);
3723         if (r < 0)
3724                 return r;
3725
3726         if (path_is_read_only_fs("/sys") <= 0) {
3727                 /* udev should be around */
3728                 sprintf(ifindex_str, "n%d", link->ifindex);
3729                 r = sd_device_new_from_device_id(&device, ifindex_str);
3730                 if (r < 0) {
3731                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3732                         return 0;
3733                 }
3734
3735                 r = sd_device_get_is_initialized(device);
3736                 if (r < 0) {
3737                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3738                         goto failed;
3739                 }
3740                 if (r == 0) {
3741                         /* not yet ready */
3742                         log_link_debug(link, "link pending udev initialization...");
3743                         return 0;
3744                 }
3745
3746                 r = device_is_renaming(device);
3747                 if (r < 0) {
3748                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3749                         goto failed;
3750                 }
3751                 if (r > 0) {
3752                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3753                         return 0;
3754                 }
3755
3756                 r = link_initialized(link, device);
3757                 if (r < 0)
3758                         goto failed;
3759         } else {
3760                 r = link_initialized_and_synced(link);
3761                 if (r < 0)
3762                         goto failed;
3763         }
3764
3765         return 0;
3766 failed:
3767         link_enter_failed(link);
3768         return r;
3769 }
3770
3771 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3772         int r;
3773
3774         assert(link);
3775
3776         log_link_info(link, "Gained IPv6LL");
3777
3778         link->ipv6ll_address = *address;
3779         link_check_ready(link);
3780
3781         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3782                 r = link_acquire_ipv6_conf(link);
3783                 if (r < 0) {
3784                         link_enter_failed(link);
3785                         return r;
3786                 }
3787         }
3788
3789         return 0;
3790 }
3791
3792 static int link_carrier_gained(Link *link) {
3793         int r;
3794
3795         assert(link);
3796
3797         r = wifi_get_info(link);
3798         if (r < 0)
3799                 return r;
3800         if (r > 0) {
3801                 r = link_reconfigure_internal(link, NULL, false);
3802                 if (r < 0) {
3803                         link_enter_failed(link);
3804                         return r;
3805                 }
3806         }
3807
3808         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3809                 r = link_acquire_conf(link);
3810                 if (r < 0) {
3811                         link_enter_failed(link);
3812                         return r;
3813                 }
3814
3815                 link_set_state(link, LINK_STATE_CONFIGURING);
3816                 r = link_request_set_addresses(link);
3817                 if (r < 0)
3818                         return r;
3819         }
3820
3821         r = link_handle_bound_by_list(link);
3822         if (r < 0)
3823                 return r;
3824
3825         return 0;
3826 }
3827
3828 static int link_carrier_lost(Link *link) {
3829         int r;
3830
3831         assert(link);
3832
3833         if (link->network && link->network->ignore_carrier_loss)
3834                 return 0;
3835
3836         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3837          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3838          * configuration and stop the clients as well. */
3839         if (link->setting_mtu)
3840                 return 0;
3841
3842         r = link_stop_clients(link, false);
3843         if (r < 0) {
3844                 link_enter_failed(link);
3845                 return r;
3846         }
3847
3848         if (link_dhcp4_server_enabled(link))
3849                 (void) sd_dhcp_server_stop(link->dhcp_server);
3850
3851         r = link_drop_config(link);
3852         if (r < 0)
3853                 return r;
3854
3855         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3856                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3857                 r = link_drop_foreign_config(link);
3858                 if (r < 0)
3859                         return r;
3860         }
3861
3862         r = link_handle_bound_by_list(link);
3863         if (r < 0)
3864                 return r;
3865
3866         return 0;
3867 }
3868
3869 int link_carrier_reset(Link *link) {
3870         int r;
3871
3872         assert(link);
3873
3874         if (link_has_carrier(link)) {
3875                 r = link_carrier_lost(link);
3876                 if (r < 0)
3877                         return r;
3878
3879                 r = link_carrier_gained(link);
3880                 if (r < 0)
3881                         return r;
3882
3883                 log_link_info(link, "Reset carrier");
3884         }
3885
3886         return 0;
3887 }
3888
3889 /* This is called every time an interface admin state changes to up;
3890  * specifically, when IFF_UP flag changes from unset to set */
3891 static int link_admin_state_up(Link *link) {
3892         int r;
3893
3894         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3895          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3896          * ipv6_mtu_set prevents this from trying to set it too early before
3897          * the link->network has been setup; we only need to reset it
3898          * here if we've already set it during normal initialization. */
3899         if (link->ipv6_mtu_set) {
3900                 r = link_set_ipv6_mtu(link);
3901                 if (r < 0)
3902                         return r;
3903         }
3904
3905         return 0;
3906 }
3907
3908 int link_update(Link *link, sd_netlink_message *m) {
3909         _cleanup_strv_free_ char **s = NULL;
3910         struct ether_addr mac;
3911         const char *ifname;
3912         uint32_t mtu;
3913         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3914         int old_master, r;
3915
3916         assert(link);
3917         assert(link->ifname);
3918         assert(m);
3919
3920         if (link->state == LINK_STATE_LINGER) {
3921                 log_link_info(link, "Link re-added");
3922                 link_set_state(link, LINK_STATE_CONFIGURING);
3923
3924                 r = link_new_carrier_maps(link);
3925                 if (r < 0)
3926                         return r;
3927         }
3928
3929         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3930         if (r >= 0 && !streq(ifname, link->ifname)) {
3931                 Manager *manager = link->manager;
3932
3933                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3934
3935                 link_drop(link);
3936                 r = link_add(manager, m, &link);
3937                 if (r < 0)
3938                         return r;
3939         }
3940
3941         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3942         if (r >= 0)
3943                 strv_free_and_replace(link->alternative_names, s);
3944
3945         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3946         if (r >= 0 && mtu > 0) {
3947                 link->mtu = mtu;
3948                 if (link->original_mtu == 0) {
3949                         link->original_mtu = mtu;
3950                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3951                 }
3952
3953                 if (link->dhcp_client) {
3954                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3955                                                    link->mtu);
3956                         if (r < 0)
3957                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3958                 }
3959
3960                 if (link->radv) {
3961                         r = sd_radv_set_mtu(link->radv, link->mtu);
3962                         if (r < 0)
3963                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3964                 }
3965         }
3966
3967         /* The kernel may broadcast NEWLINK messages without the MAC address
3968            set, simply ignore them. */
3969         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3970         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
3971
3972                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
3973
3974                 log_link_debug(link, "Gained new MAC address: "
3975                                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3976                                mac.ether_addr_octet[0],
3977                                mac.ether_addr_octet[1],
3978                                mac.ether_addr_octet[2],
3979                                mac.ether_addr_octet[3],
3980                                mac.ether_addr_octet[4],
3981                                mac.ether_addr_octet[5]);
3982
3983                 if (link->ipv4ll) {
3984                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
3985
3986                         if (restart) {
3987                                 r = sd_ipv4ll_stop(link->ipv4ll);
3988                                 if (r < 0)
3989                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
3990                         }
3991
3992                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3993                         if (r < 0)
3994                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3995
3996                         if (restart) {
3997                                 r = sd_ipv4ll_start(link->ipv4ll);
3998                                 if (r < 0)
3999                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
4000                         }
4001                 }
4002
4003                 if (link->dhcp_client) {
4004                         r = sd_dhcp_client_set_mac(link->dhcp_client,
4005                                                    (const uint8_t *) &link->mac,
4006                                                    sizeof (link->mac),
4007                                                    ARPHRD_ETHER);
4008                         if (r < 0)
4009                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
4010
4011                         r = dhcp4_set_client_identifier(link);
4012                         if (r < 0)
4013                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
4014                 }
4015
4016                 if (link->dhcp6_client) {
4017                         const DUID* duid = link_get_duid(link);
4018                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
4019
4020                         if (restart) {
4021                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
4022                                 if (r < 0)
4023                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
4024                         }
4025
4026                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
4027                                                     (const uint8_t *) &link->mac,
4028                                                     sizeof (link->mac),
4029                                                     ARPHRD_ETHER);
4030                         if (r < 0)
4031                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4032
4033                         if (link->network->iaid_set) {
4034                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4035                                 if (r < 0)
4036                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4037                         }
4038
4039                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4040                                                      duid->type,
4041                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4042                                                      duid->raw_data_len);
4043                         if (r < 0)
4044                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4045
4046                         if (restart) {
4047                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4048                                 if (r < 0)
4049                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4050                         }
4051                 }
4052
4053                 if (link->radv) {
4054                         bool restart = sd_radv_is_running(link->radv);
4055
4056                         if (restart) {
4057                                 r = sd_radv_stop(link->radv);
4058                                 if (r < 0)
4059                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4060                         }
4061
4062                         r = sd_radv_set_mac(link->radv, &link->mac);
4063                         if (r < 0)
4064                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4065
4066                         if (restart) {
4067                                 r = sd_radv_start(link->radv);
4068                                 if (r < 0)
4069                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4070                         }
4071                 }
4072
4073                 if (link->ndisc) {
4074                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4075                         if (r < 0)
4076                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4077                 }
4078         }
4079
4080         old_master = link->master_ifindex;
4081         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4082
4083         link_was_admin_up = link->flags & IFF_UP;
4084         had_carrier = link_has_carrier(link);
4085
4086         r = link_update_flags(link, m, old_master != link->master_ifindex);
4087         if (r < 0)
4088                 return r;
4089
4090         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4091                 log_link_info(link, "Link UP");
4092
4093                 r = link_admin_state_up(link);
4094                 if (r < 0)
4095                         return r;
4096         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4097                 log_link_info(link, "Link DOWN");
4098
4099         r = link_update_lldp(link);
4100         if (r < 0)
4101                 return r;
4102
4103         carrier_gained = !had_carrier && link_has_carrier(link);
4104         carrier_lost = had_carrier && !link_has_carrier(link);
4105
4106         if (carrier_gained) {
4107                 log_link_info(link, "Gained carrier");
4108
4109                 r = link_carrier_gained(link);
4110                 if (r < 0)
4111                         return r;
4112         } else if (carrier_lost) {
4113                 log_link_info(link, "Lost carrier");
4114
4115                 r = link_carrier_lost(link);
4116                 if (r < 0)
4117                         return r;
4118         }
4119
4120         return 0;
4121 }
4122
4123 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4124         bool space = false;
4125         Iterator i;
4126         Link *link;
4127
4128         assert(f);
4129         assert(prefix);
4130
4131         if (hashmap_isempty(h))
4132                 return;
4133
4134         fputs(prefix, f);
4135         HASHMAP_FOREACH(link, h, i) {
4136                 if (space)
4137                         fputc(' ', f);
4138
4139                 fprintf(f, "%i", link->ifindex);
4140                 space = true;
4141         }
4142
4143         fputc('\n', f);
4144 }
4145
4146 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4147         for (unsigned j = 0; j < n_dns; j++) {
4148                 const char *str;
4149
4150                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4151                         continue;
4152
4153                 str = in_addr_full_to_string(dns[j]);
4154                 if (!str)
4155                         continue;
4156
4157                 if (*space)
4158                         fputc(' ', f);
4159                 fputs(str, f);
4160                 *space = true;
4161         }
4162 }
4163
4164 static void serialize_addresses(
4165                 FILE *f,
4166                 const char *lvalue,
4167                 bool *space,
4168                 char **addresses,
4169                 sd_dhcp_lease *lease,
4170                 bool conditional,
4171                 sd_dhcp_lease_server_type what,
4172                 sd_dhcp6_lease *lease6,
4173                 bool conditional6,
4174                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4175                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4176         int r;
4177
4178         bool _space = false;
4179         if (!space)
4180                 space = &_space;
4181
4182         if (lvalue)
4183                 fprintf(f, "%s=", lvalue);
4184         fputstrv(f, addresses, NULL, space);
4185
4186         if (lease && conditional) {
4187                 const struct in_addr *lease_addresses;
4188
4189                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4190                 if (r > 0)
4191                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4192         }
4193
4194         if (lease6 && conditional6 && lease6_get_addr) {
4195                 const struct in6_addr *in6_addrs;
4196
4197                 r = lease6_get_addr(lease6, &in6_addrs);
4198                 if (r > 0)
4199                         serialize_in6_addrs(f, in6_addrs, r, space);
4200         }
4201
4202         if (lease6 && conditional6 && lease6_get_fqdn) {
4203                 char **in6_hosts;
4204
4205                 r = lease6_get_fqdn(lease6, &in6_hosts);
4206                 if (r > 0)
4207                         fputstrv(f, in6_hosts, NULL, space);
4208         }
4209
4210         if (lvalue)
4211                 fputc('\n', f);
4212 }
4213
4214 int link_save(Link *link) {
4215         const char *admin_state, *oper_state, *carrier_state, *address_state;
4216         _cleanup_free_ char *temp_path = NULL;
4217         _cleanup_fclose_ FILE *f = NULL;
4218         Route *route;
4219         Address *a;
4220         Iterator i;
4221         int r;
4222
4223         assert(link);
4224         assert(link->state_file);
4225         assert(link->lease_file);
4226         assert(link->manager);
4227
4228         if (link->state == LINK_STATE_LINGER) {
4229                 (void) unlink(link->state_file);
4230                 return 0;
4231         }
4232
4233         link_lldp_save(link);
4234
4235         admin_state = link_state_to_string(link->state);
4236         assert(admin_state);
4237
4238         oper_state = link_operstate_to_string(link->operstate);
4239         assert(oper_state);
4240
4241         carrier_state = link_carrier_state_to_string(link->carrier_state);
4242         assert(carrier_state);
4243
4244         address_state = link_address_state_to_string(link->address_state);
4245         assert(address_state);
4246
4247         r = fopen_temporary(link->state_file, &f, &temp_path);
4248         if (r < 0)
4249                 goto fail;
4250
4251         (void) fchmod(fileno(f), 0644);
4252
4253         fprintf(f,
4254                 "# This is private data. Do not parse.\n"
4255                 "ADMIN_STATE=%s\n"
4256                 "OPER_STATE=%s\n"
4257                 "CARRIER_STATE=%s\n"
4258                 "ADDRESS_STATE=%s\n",
4259                 admin_state, oper_state, carrier_state, address_state);
4260
4261         if (link->network) {
4262                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4263                 const char *dhcp_domainname = NULL, *p;
4264                 bool space;
4265
4266                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4267                         yes_no(link->network->required_for_online));
4268
4269                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4270                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4271                         strempty(link_operstate_to_string(st.min)),
4272                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4273                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4274
4275                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4276
4277                 /************************************************************/
4278
4279                 fputs("DNS=", f);
4280                 space = false;
4281                 if (link->n_dns != (unsigned) -1)
4282                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4283                 else
4284                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4285
4286                 serialize_addresses(f, NULL, &space,
4287                                     NULL,
4288                                     link->dhcp_lease,
4289                                     link->network->dhcp_use_dns,
4290                                     SD_DHCP_LEASE_DNS,
4291                                     link->dhcp6_lease,
4292                                     link->network->dhcp6_use_dns,
4293                                     sd_dhcp6_lease_get_dns,
4294                                     NULL);
4295
4296                 /* Make sure to flush out old entries before we use the NDisc data */
4297                 ndisc_vacuum(link);
4298
4299                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4300                         NDiscRDNSS *dd;
4301
4302                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4303                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4304                 }
4305
4306                 fputc('\n', f);
4307
4308                 /************************************************************/
4309
4310                 serialize_addresses(f, "NTP", NULL,
4311                                     link->ntp ?: link->network->ntp,
4312                                     link->dhcp_lease,
4313                                     link->network->dhcp_use_ntp,
4314                                     SD_DHCP_LEASE_NTP,
4315                                     link->dhcp6_lease,
4316                                     link->network->dhcp6_use_ntp,
4317                                     sd_dhcp6_lease_get_ntp_addrs,
4318                                     sd_dhcp6_lease_get_ntp_fqdn);
4319
4320                 serialize_addresses(f, "SIP", NULL,
4321                                     NULL,
4322                                     link->dhcp_lease,
4323                                     link->network->dhcp_use_sip,
4324                                     SD_DHCP_LEASE_SIP,
4325                                     NULL, false, NULL, NULL);
4326
4327                 /************************************************************/
4328
4329                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4330                         if (link->dhcp_lease) {
4331                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4332                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4333                         }
4334                         if (link->dhcp6_lease)
4335                                 (void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains);
4336                 }
4337
4338                 fputs("DOMAINS=", f);
4339                 space = false;
4340                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4341                         fputs_with_space(f, p, NULL, &space);
4342
4343                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4344                         if (dhcp_domainname)
4345                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4346                         if (dhcp_domains)
4347                                 fputstrv(f, dhcp_domains, NULL, &space);
4348                         if (dhcp6_domains)
4349                                 fputstrv(f, dhcp6_domains, NULL, &space);
4350                 }
4351
4352                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4353                         NDiscDNSSL *dd;
4354
4355                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4356                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4357                 }
4358
4359                 fputc('\n', f);
4360
4361                 /************************************************************/
4362
4363                 fputs("ROUTE_DOMAINS=", f);
4364                 space = false;
4365                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4366                         fputs_with_space(f, p, NULL, &space);
4367
4368                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4369                         if (dhcp_domainname)
4370                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4371                         if (dhcp_domains)
4372                                 fputstrv(f, dhcp_domains, NULL, &space);
4373                         if (dhcp6_domains)
4374                                 fputstrv(f, dhcp6_domains, NULL, &space);
4375                 }
4376
4377                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4378                         NDiscDNSSL *dd;
4379
4380                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4381                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4382                 }
4383
4384                 fputc('\n', f);
4385
4386                 /************************************************************/
4387
4388                 fprintf(f, "LLMNR=%s\n",
4389                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4390
4391                 /************************************************************/
4392
4393                 fprintf(f, "MDNS=%s\n",
4394                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4395
4396                 /************************************************************/
4397
4398                 int dns_default_route =
4399                         link->dns_default_route >= 0 ? link->dns_default_route :
4400                         link->network->dns_default_route;
4401                 if (dns_default_route >= 0)
4402                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4403
4404                 /************************************************************/
4405
4406                 DnsOverTlsMode dns_over_tls_mode =
4407                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4408                         link->network->dns_over_tls_mode;
4409                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4410                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4411
4412                 /************************************************************/
4413
4414                 DnssecMode dnssec_mode =
4415                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4416                         link->network->dnssec_mode;
4417                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4418                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4419
4420                 /************************************************************/
4421
4422                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4423                 if (set_isempty(nta_anchors))
4424                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4425
4426                 if (!set_isempty(nta_anchors)) {
4427                         const char *n;
4428
4429                         fputs("DNSSEC_NTA=", f);
4430                         space = false;
4431                         SET_FOREACH(n, nta_anchors, i)
4432                                 fputs_with_space(f, n, NULL, &space);
4433                         fputc('\n', f);
4434                 }
4435
4436                 /************************************************************/
4437
4438                 fputs("ADDRESSES=", f);
4439                 space = false;
4440                 SET_FOREACH(a, link->addresses, i) {
4441                         _cleanup_free_ char *address_str = NULL;
4442
4443                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4444                         if (r < 0)
4445                                 goto fail;
4446
4447                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4448                         space = true;
4449                 }
4450                 fputc('\n', f);
4451
4452                 /************************************************************/
4453
4454                 fputs("ROUTES=", f);
4455                 space = false;
4456                 SET_FOREACH(route, link->routes, i) {
4457                         _cleanup_free_ char *route_str = NULL;
4458
4459                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4460                         if (r < 0)
4461                                 goto fail;
4462
4463                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4464                                 space ? " " : "", route_str,
4465                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4466                         space = true;
4467                 }
4468
4469                 fputc('\n', f);
4470         }
4471
4472         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4473         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4474
4475         if (link->dhcp_lease) {
4476                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4477                 if (r < 0)
4478                         goto fail;
4479
4480                 fprintf(f,
4481                         "DHCP_LEASE=%s\n",
4482                         link->lease_file);
4483         } else
4484                 (void) unlink(link->lease_file);
4485
4486         if (link->ipv4ll) {
4487                 struct in_addr address;
4488
4489                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4490                 if (r >= 0) {
4491                         fputs("IPV4LL_ADDRESS=", f);
4492                         serialize_in_addrs(f, &address, 1, false, NULL);
4493                         fputc('\n', f);
4494                 }
4495         }
4496
4497         if (link->dhcp6_client) {
4498                 _cleanup_free_ char *duid = NULL;
4499                 uint32_t iaid;
4500
4501                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4502                 if (r >= 0)
4503                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4504
4505                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4506                 if (r >= 0)
4507                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4508         }
4509
4510         r = fflush_and_check(f);
4511         if (r < 0)
4512                 goto fail;
4513
4514         if (rename(temp_path, link->state_file) < 0) {
4515                 r = -errno;
4516                 goto fail;
4517         }
4518
4519         return 0;
4520
4521 fail:
4522         (void) unlink(link->state_file);
4523         if (temp_path)
4524                 (void) unlink(temp_path);
4525
4526         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4527 }
4528
4529 /* The serialized state in /run is no longer up-to-date. */
4530 void link_dirty(Link *link) {
4531         int r;
4532
4533         assert(link);
4534
4535         /* mark manager dirty as link is dirty */
4536         manager_dirty(link->manager);
4537
4538         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4539         if (r <= 0)
4540                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4541                 return;
4542         link_ref(link);
4543 }
4544
4545 /* The serialized state in /run is up-to-date */
4546 void link_clean(Link *link) {
4547         assert(link);
4548         assert(link->manager);
4549
4550         link_unref(set_remove(link->manager->dirty_links, link));
4551 }
4552
4553 int link_save_and_clean(Link *link) {
4554         int r;
4555
4556         r = link_save(link);
4557         if (r < 0)
4558                 return r;
4559
4560         link_clean(link);
4561         return 0;
4562 }
4563
4564 static const char* const link_state_table[_LINK_STATE_MAX] = {
4565         [LINK_STATE_PENDING] = "pending",
4566         [LINK_STATE_INITIALIZED] = "initialized",
4567         [LINK_STATE_CONFIGURING] = "configuring",
4568         [LINK_STATE_CONFIGURED] = "configured",
4569         [LINK_STATE_UNMANAGED] = "unmanaged",
4570         [LINK_STATE_FAILED] = "failed",
4571         [LINK_STATE_LINGER] = "linger",
4572 };
4573
4574 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4575
4576 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4577         const char *err_msg = NULL;
4578
4579         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4580         return log_link_full(link, level, err,
4581                              "%s: %s%s%s%m",
4582                              msg,
4583                              strempty(err_msg),
4584                              err_msg && !endswith(err_msg, ".") ? "." : "",
4585                              err_msg ? " " : "");
4586 }