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->static_addresses = set_free(link->static_addresses);
 734         link->dhcp6_addresses = set_free(link->dhcp6_addresses);
 735         link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old);
 736         link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses);
 737         link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old);
 738         link->ndisc_addresses = set_free(link->ndisc_addresses);
 739         link->ndisc_addresses_old = set_free(link->ndisc_addresses_old);
 740
 741         while ((address = link->pool_addresses)) {
 742                 LIST_REMOVE(addresses, link->pool_addresses, address);
 743                 address_free(address);
 744         }
 745
 746         link_lldp_emit_stop(link);
 747         link_free_engines(link);
 748         free(link->lease_file);
 749         free(link->lldp_file);
 750
 751         free(link->ifname);
 752         strv_free(link->alternative_names);
 753         free(link->kind);
 754         free(link->ssid);
 755         free(link->driver);
 756
 757         (void) unlink(link->state_file);
 758         free(link->state_file);
 759
 760         sd_device_unref(link->sd_device);
 761
 762         hashmap_free(link->bound_to_links);
 763         hashmap_free(link->bound_by_links);
 764
 765         set_free_with_destructor(link->slaves, link_unref);
 766
 767         network_unref(link->network);
 768
 769         return mfree(link);
 770 }
 771
 772 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 773
 774 int link_get(Manager *m, int ifindex, Link **ret) {
 775         Link *link;
 776
 777         assert(m);
 778         assert(ifindex > 0);
 779         assert(ret);
 780
 781         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 782         if (!link)
 783                 return -ENODEV;
 784
 785         *ret = link;
 786
 787         return 0;
 788 }
 789
 790 void link_set_state(Link *link, LinkState state) {
 791         assert(link);
 792
 793         if (link->state == state)
 794                 return;
 795
 796         log_link_debug(link, "State changed: %s -> %s",
 797                        link_state_to_string(link->state),
 798                        link_state_to_string(state));
 799
 800         link->state = state;
 801
 802         link_send_changed(link, "AdministrativeState", NULL);
 803 }
 804
 805 static void link_enter_unmanaged(Link *link) {
 806         assert(link);
 807
 808         link_set_state(link, LINK_STATE_UNMANAGED);
 809
 810         link_dirty(link);
 811 }
 812
 813 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 814         int r = 0, k;
 815         Address *ad;
 816
 817         assert(link);
 818         assert(link->manager);
 819         assert(link->manager->event);
 820
 821         bool keep_dhcp = may_keep_dhcp &&
 822                          link->network &&
 823                          (link->manager->restarting ||
 824                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 825
 826         if (link->dhcp_client && !keep_dhcp) {
 827                 k = sd_dhcp_client_stop(link->dhcp_client);
 828                 if (k < 0)
 829                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 830         }
 831
 832         if (link->ipv4ll) {
 833                 k = sd_ipv4ll_stop(link->ipv4ll);
 834                 if (k < 0)
 835                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 836         }
 837
 838         if (link->network)
 839                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 840                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 841                                 k = sd_ipv4acd_stop(ad->acd);
 842                                 if (k < 0)
 843                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 844                         }
 845
 846         if (link->dhcp6_client) {
 847                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 848                 if (k < 0)
 849                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 850         }
 851
 852         if (link_dhcp6_pd_is_enabled(link)) {
 853                 k = dhcp6_pd_remove(link);
 854                 if (k < 0)
 855                         r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 856         }
 857
 858         if (link->ndisc) {
 859                 k = sd_ndisc_stop(link->ndisc);
 860                 if (k < 0)
 861                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 862         }
 863
 864         if (link->radv) {
 865                 k = sd_radv_stop(link->radv);
 866                 if (k < 0)
 867                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 868         }
 869
 870         link_lldp_emit_stop(link);
 871         return r;
 872 }
 873
 874 void link_enter_failed(Link *link) {
 875         assert(link);
 876
 877         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 878                 return;
 879
 880         log_link_warning(link, "Failed");
 881
 882         link_set_state(link, LINK_STATE_FAILED);
 883
 884         link_stop_clients(link, false);
 885
 886         link_dirty(link);
 887 }
 888
 889 static int link_join_netdevs_after_configured(Link *link) {
 890         NetDev *netdev;
 891         Iterator i;
 892         int r;
 893
 894         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 895                 if (netdev->ifindex > 0)
 896                         /* Assume already enslaved. */
 897                         continue;
 898
 899                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 900                         continue;
 901
 902                 log_struct(LOG_DEBUG,
 903                            LOG_LINK_INTERFACE(link),
 904                            LOG_NETDEV_INTERFACE(netdev),
 905                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 906
 907                 r = netdev_join(netdev, link, NULL);
 908                 if (r < 0)
 909                         return log_struct_errno(LOG_WARNING, r,
 910                                                 LOG_LINK_INTERFACE(link),
 911                                                 LOG_NETDEV_INTERFACE(netdev),
 912                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 913         }
 914
 915         return 0;
 916 }
 917
 918 static void link_enter_configured(Link *link) {
 919         assert(link);
 920         assert(link->network);
 921
 922         if (link->state != LINK_STATE_CONFIGURING)
 923                 return;
 924
 925         link_set_state(link, LINK_STATE_CONFIGURED);
 926
 927         (void) link_join_netdevs_after_configured(link);
 928
 929         link_dirty(link);
 930 }
 931
 932 static int link_request_set_routing_policy_rule(Link *link) {
 933         RoutingPolicyRule *rule, *rrule = NULL;
 934         int r;
 935
 936         assert(link);
 937         assert(link->network);
 938
 939         link->routing_policy_rules_configured = false;
 940
 941         LIST_FOREACH(rules, rule, link->network->rules) {
 942                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 943                 if (r >= 0) {
 944                         if (r == 0)
 945                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 946                         continue;
 947                 }
 948
 949                 r = routing_policy_rule_configure(rule, link, NULL);
 950                 if (r < 0)
 951                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 952                 if (r > 0)
 953                         link->routing_policy_rule_messages++;
 954         }
 955
 956         routing_policy_rule_purge(link->manager, link);
 957         if (link->routing_policy_rule_messages == 0)
 958                 link->routing_policy_rules_configured = true;
 959         else {
 960                 log_link_debug(link, "Setting routing policy rules");
 961                 link_set_state(link, LINK_STATE_CONFIGURING);
 962         }
 963
 964         return 0;
 965 }
 966
 967 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 968         int r;
 969
 970         assert(link);
 971         assert(link->nexthop_messages > 0);
 972         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 973                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 974
 975         link->nexthop_messages--;
 976
 977         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 978                 return 1;
 979
 980         r = sd_netlink_message_get_errno(m);
 981         if (r < 0 && r != -EEXIST) {
 982                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 983                 link_enter_failed(link);
 984                 return 1;
 985         }
 986
 987         if (link->nexthop_messages == 0) {
 988                 log_link_debug(link, "Nexthop set");
 989                 link->static_nexthops_configured = true;
 990                 link_check_ready(link);
 991         }
 992
 993         return 1;
 994 }
 995
 996 static int link_request_set_nexthop(Link *link) {
 997         NextHop *nh;
 998         int r;
 999
1000         link->static_nexthops_configured = false;
1001
1002         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
1003                 r = nexthop_configure(nh, link, nexthop_handler);
1004                 if (r < 0)
1005                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
1006                 if (r > 0)
1007                         link->nexthop_messages++;
1008         }
1009
1010         if (link->nexthop_messages == 0) {
1011                 link->static_nexthops_configured = true;
1012                 link_check_ready(link);
1013         } else {
1014                 log_link_debug(link, "Setting nexthop");
1015                 link_set_state(link, LINK_STATE_CONFIGURING);
1016         }
1017
1018         return 1;
1019 }
1020
1021 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1022         int r;
1023
1024         assert(link);
1025         assert(link->route_messages > 0);
1026         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1027                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1028
1029         link->route_messages--;
1030
1031         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1032                 return 1;
1033
1034         r = sd_netlink_message_get_errno(m);
1035         if (r < 0 && r != -EEXIST) {
1036                 log_link_message_warning_errno(link, m, r, "Could not set route");
1037                 link_enter_failed(link);
1038                 return 1;
1039         }
1040
1041         if (link->route_messages == 0) {
1042                 log_link_debug(link, "Routes set");
1043                 link->static_routes_configured = true;
1044                 link_request_set_nexthop(link);
1045         }
1046
1047         return 1;
1048 }
1049
1050 int link_request_set_routes(Link *link) {
1051         enum {
1052                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1053                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1054                 _PHASE_MAX
1055         } phase;
1056         Route *rt;
1057         int r;
1058
1059         assert(link);
1060         assert(link->network);
1061         assert(link->state != _LINK_STATE_INVALID);
1062
1063         link->static_routes_configured = false;
1064
1065         if (!link->addresses_ready)
1066                 return 0;
1067
1068         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1069                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1070                  * the addresses now, let's not configure the routes either. */
1071                 return 0;
1072
1073         r = link_request_set_routing_policy_rule(link);
1074         if (r < 0)
1075                 return r;
1076
1077         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1078         for (phase = 0; phase < _PHASE_MAX; phase++)
1079                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1080                         if (rt->gateway_from_dhcp)
1081                                 continue;
1082
1083                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1084                                 continue;
1085
1086                         r = route_configure(rt, link, route_handler, NULL);
1087                         if (r < 0)
1088                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1089                         if (r > 0)
1090                                 link->route_messages++;
1091                 }
1092
1093         if (link->route_messages == 0) {
1094                 link->static_routes_configured = true;
1095                 link_request_set_nexthop(link);
1096         } else {
1097                 log_link_debug(link, "Setting routes");
1098                 link_set_state(link, LINK_STATE_CONFIGURING);
1099         }
1100
1101         return 0;
1102 }
1103
1104 void link_check_ready(Link *link) {
1105         Address *a;
1106         Iterator i;
1107
1108         assert(link);
1109
1110         if (link->state == LINK_STATE_CONFIGURED)
1111                 return;
1112
1113         if (link->state != LINK_STATE_CONFIGURING) {
1114                 log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
1115                 return;
1116         }
1117
1118         if (!link->network)
1119                 return;
1120
1121         if (!link->addresses_configured) {
1122                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1123                 return;
1124         }
1125
1126         if (!link->neighbors_configured) {
1127                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1128                 return;
1129         }
1130
1131         SET_FOREACH(a, link->addresses, i)
1132                 if (!address_is_ready(a)) {
1133                         _cleanup_free_ char *str = NULL;
1134
1135                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1136                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1137                         return;
1138                 }
1139
1140         if (!link->static_routes_configured) {
1141                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1142                 return;
1143         }
1144
1145         if (!link->static_nexthops_configured) {
1146                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1147                 return;
1148         }
1149
1150         if (!link->routing_policy_rules_configured) {
1151                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1152                 return;
1153         }
1154
1155         if (!link->tc_configured) {
1156                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1157                 return;
1158         }
1159
1160         if (!link->sr_iov_configured) {
1161                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1162                 return;
1163         }
1164
1165         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1166
1167                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address_configured) {
1168                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1169                         return;
1170                 }
1171
1172                 if (link_ipv6ll_enabled(link) &&
1173                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1174                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1175                         return;
1176                 }
1177
1178                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1179                     !link->dhcp_address && set_isempty(link->dhcp6_addresses) && set_isempty(link->ndisc_addresses) &&
1180                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) {
1181                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no dynamic address is assigned yet.", __func__);
1182                         return;
1183                 }
1184
1185                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) || link_ipv6_accept_ra_enabled(link)) {
1186                         if (!link->dhcp4_configured &&
1187                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1188                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1189                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1190                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) {
1191                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1192                                  * an IPv4ll fallback address must be configured. */
1193                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1194                                 return;
1195                         }
1196
1197                         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",
1198                                        __func__,
1199                                        yes_no(link->dhcp4_configured),
1200                                        yes_no(link->dhcp6_address_configured),
1201                                        yes_no(link->dhcp6_route_configured),
1202                                        yes_no(link->dhcp6_pd_address_configured),
1203                                        yes_no(link->dhcp6_pd_route_configured),
1204                                        yes_no(link->ndisc_addresses_configured),
1205                                        yes_no(link->ndisc_routes_configured));
1206                 }
1207         }
1208
1209         link_enter_configured(link);
1210
1211         return;
1212 }
1213
1214 static int link_request_set_neighbors(Link *link) {
1215         Neighbor *neighbor;
1216         int r;
1217
1218         assert(link);
1219         assert(link->network);
1220         assert(link->state != _LINK_STATE_INVALID);
1221
1222         link->neighbors_configured = false;
1223
1224         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1225                 r = neighbor_configure(neighbor, link, NULL);
1226                 if (r < 0)
1227                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1228         }
1229
1230         if (link->neighbor_messages == 0) {
1231                 link->neighbors_configured = true;
1232                 link_check_ready(link);
1233         } else {
1234                 log_link_debug(link, "Setting neighbors");
1235                 link_set_state(link, LINK_STATE_CONFIGURING);
1236         }
1237
1238         return 0;
1239 }
1240
1241 static int link_set_bridge_fdb(Link *link) {
1242         FdbEntry *fdb_entry;
1243         int r;
1244
1245         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1246                 r = fdb_entry_configure(link, fdb_entry);
1247                 if (r < 0)
1248                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1249         }
1250
1251         return 0;
1252 }
1253
1254 static int static_address_ready_callback(Address *address) {
1255         Address *a;
1256         Iterator i;
1257         Link *link;
1258
1259         assert(address);
1260         assert(address->link);
1261
1262         link = address->link;
1263
1264         if (!link->addresses_configured)
1265                 return 0;
1266
1267         SET_FOREACH(a, link->static_addresses, i)
1268                 if (!address_is_ready(a)) {
1269                         _cleanup_free_ char *str = NULL;
1270
1271                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1272                         log_link_debug(link, "an address %s/%u is not ready", strnull(str), a->prefixlen);
1273                         return 0;
1274                 }
1275
1276         /* This should not be called again */
1277         SET_FOREACH(a, link->static_addresses, i)
1278                 a->callback = NULL;
1279
1280         link->addresses_ready = true;
1281
1282         return link_request_set_routes(link);
1283 }
1284
1285 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1286         int r;
1287
1288         assert(rtnl);
1289         assert(m);
1290         assert(link);
1291         assert(link->ifname);
1292         assert(link->address_messages > 0);
1293         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1294                LINK_STATE_FAILED, LINK_STATE_LINGER));
1295
1296         link->address_messages--;
1297
1298         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1299                 return 1;
1300
1301         r = sd_netlink_message_get_errno(m);
1302         if (r < 0 && r != -EEXIST) {
1303                 log_link_message_warning_errno(link, m, r, "Could not set address");
1304                 link_enter_failed(link);
1305                 return 1;
1306         } else if (r >= 0)
1307                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1308
1309         if (link->address_messages == 0) {
1310                 Address *a;
1311
1312                 log_link_debug(link, "Addresses set");
1313                 link->addresses_configured = true;
1314
1315                 /* When all static addresses are already ready, then static_address_ready_callback()
1316                  * will not be called automatically. So, call it here. */
1317                 a = set_first(link->static_addresses);
1318                 if (!a) {
1319                         log_link_warning(link, "No static address is stored.");
1320                         link_enter_failed(link);
1321                         return 1;
1322                 }
1323                 if (!a->callback) {
1324                         log_link_warning(link, "Address ready callback is not set.");
1325                         link_enter_failed(link);
1326                         return 1;
1327                 }
1328                 r = a->callback(a);
1329                 if (r < 0)
1330                         link_enter_failed(link);
1331         }
1332
1333         return 1;
1334 }
1335
1336 static int static_address_configure(Address *address, Link *link, bool update) {
1337         Address *ret;
1338         int r;
1339
1340         assert(address);
1341         assert(link);
1342
1343         r = address_configure(address, link, address_handler, update, &ret);
1344         if (r < 0)
1345                 return log_link_warning_errno(link, r, "Could not configure static address: %m");
1346
1347         link->address_messages++;
1348
1349         r = set_ensure_put(&link->static_addresses, &address_hash_ops, ret);
1350         if (r < 0)
1351                 return log_link_warning_errno(link, r, "Failed to store static address: %m");
1352
1353         ret->callback = static_address_ready_callback;
1354
1355         return 0;
1356 }
1357
1358 static int link_request_set_addresses(Link *link) {
1359         AddressLabel *label;
1360         Address *ad;
1361         Prefix *p;
1362         int r;
1363
1364         assert(link);
1365         assert(link->network);
1366         assert(link->state != _LINK_STATE_INVALID);
1367
1368         /* Reset all *_configured flags we are configuring. */
1369         link->addresses_configured = false;
1370         link->addresses_ready = false;
1371         link->neighbors_configured = false;
1372         link->static_routes_configured = false;
1373         link->static_nexthops_configured = false;
1374         link->routing_policy_rules_configured = false;
1375
1376         r = link_set_bridge_fdb(link);
1377         if (r < 0)
1378                 return r;
1379
1380         r = link_request_set_neighbors(link);
1381         if (r < 0)
1382                 return r;
1383
1384         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1385                 bool update;
1386
1387                 if (ad->family == AF_INET6 && !in_addr_is_null(ad->family, &ad->in_addr_peer))
1388                         update = address_get(link, ad->family, &ad->in_addr_peer, ad->prefixlen, NULL) > 0;
1389                 else
1390                         update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1391
1392                 r = static_address_configure(ad, link, update);
1393                 if (r < 0)
1394                         return r;
1395         }
1396
1397         if (link->network->router_prefix_delegation & RADV_PREFIX_DELEGATION_STATIC)
1398                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1399                         _cleanup_(address_freep) Address *address = NULL;
1400
1401                         if (!p->assign)
1402                                 continue;
1403
1404                         r = address_new(&address);
1405                         if (r < 0)
1406                                 return log_oom();
1407
1408                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1409                         if (r < 0)
1410                                 return log_link_warning_errno(link, r, "Could not get RA prefix: %m");
1411
1412                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1413                         if (r < 0)
1414                                 return log_link_warning_errno(link, r, "Could not generate EUI64 address: %m");
1415
1416                         address->family = AF_INET6;
1417                         r = static_address_configure(address, link, true);
1418                         if (r < 0)
1419                                 return r;
1420                 }
1421
1422         LIST_FOREACH(labels, label, link->network->address_labels) {
1423                 r = address_label_configure(label, link, NULL, false);
1424                 if (r < 0)
1425                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1426
1427                 link->address_label_messages++;
1428         }
1429
1430         /* now that we can figure out a default address for the dhcp server, start it */
1431         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1432                 r = dhcp4_server_configure(link);
1433                 if (r < 0)
1434                         return r;
1435                 log_link_debug(link, "Offering DHCPv4 leases");
1436         }
1437
1438         if (link->address_messages == 0) {
1439                 link->addresses_configured = true;
1440                 link->addresses_ready = true;
1441                 r = link_request_set_routes(link);
1442                 if (r < 0)
1443                         return r;
1444         } else {
1445                 log_link_debug(link, "Setting addresses");
1446                 link_set_state(link, LINK_STATE_CONFIGURING);
1447         }
1448
1449         return 0;
1450 }
1451
1452 static int link_set_bridge_vlan(Link *link) {
1453         int r;
1454
1455         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1456         if (r < 0)
1457                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1458
1459         return r;
1460 }
1461
1462 static int link_set_proxy_arp(Link *link) {
1463         int r;
1464
1465         if (!link_proxy_arp_enabled(link))
1466                 return 0;
1467
1468         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1469         if (r < 0)
1470                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1471
1472         return 0;
1473 }
1474
1475 static int link_configure_continue(Link *link);
1476
1477 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1478         int r;
1479
1480         assert(m);
1481         assert(link);
1482         assert(link->ifname);
1483
1484         link->setting_mtu = false;
1485
1486         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1487                 return 1;
1488
1489         r = sd_netlink_message_get_errno(m);
1490         if (r < 0)
1491                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1492         else
1493                 log_link_debug(link, "Setting MTU done.");
1494
1495         if (link->state == LINK_STATE_INITIALIZED) {
1496                 r = link_configure_continue(link);
1497                 if (r < 0)
1498                         link_enter_failed(link);
1499         }
1500
1501         return 1;
1502 }
1503
1504 int link_set_mtu(Link *link, uint32_t mtu) {
1505         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1506         int r;
1507
1508         assert(link);
1509         assert(link->manager);
1510         assert(link->manager->rtnl);
1511
1512         if (mtu == 0 || link->setting_mtu)
1513                 return 0;
1514
1515         if (link->mtu == mtu)
1516                 return 0;
1517
1518         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1519
1520         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1521         if (r < 0)
1522                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1523
1524         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1525          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1526         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1527
1528                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1529                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1530
1531                 mtu = IPV6_MIN_MTU;
1532         }
1533
1534         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1535         if (r < 0)
1536                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1537
1538         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1539                                link_netlink_destroy_callback, link);
1540         if (r < 0)
1541                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1542
1543         link_ref(link);
1544         link->setting_mtu = true;
1545
1546         return 0;
1547 }
1548
1549 static bool link_reduces_vlan_mtu(Link *link) {
1550         /* See netif_reduces_vlan_mtu() in kernel. */
1551         return streq_ptr(link->kind, "macsec");
1552 }
1553
1554 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1555         uint32_t mtu = 0;
1556         NetDev *dev;
1557         Iterator i;
1558
1559         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1560                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1561                         /* See vlan_dev_change_mtu() in kernel. */
1562                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1563
1564                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1565                         /* See macvlan_change_mtu() in kernel. */
1566                         mtu = dev->mtu;
1567
1568         return mtu;
1569 }
1570
1571 static int link_configure_mtu(Link *link) {
1572         uint32_t mtu;
1573
1574         assert(link);
1575         assert(link->network);
1576
1577         if (link->network->mtu > 0)
1578                 return link_set_mtu(link, link->network->mtu);
1579
1580         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1581         if (link->mtu >= mtu)
1582                 return 0;
1583
1584         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1585                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1586                         link->mtu, mtu);
1587
1588         return link_set_mtu(link, mtu);
1589 }
1590
1591 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1592         int r;
1593
1594         assert(m);
1595         assert(link);
1596         assert(link->ifname);
1597
1598         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1599                 return 1;
1600
1601         r = sd_netlink_message_get_errno(m);
1602         if (r < 0)
1603                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1604
1605         return 1;
1606 }
1607
1608 static int link_set_flags(Link *link) {
1609         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1610         unsigned ifi_change = 0;
1611         unsigned ifi_flags = 0;
1612         int r;
1613
1614         assert(link);
1615         assert(link->manager);
1616         assert(link->manager->rtnl);
1617
1618         if (link->flags & IFF_LOOPBACK)
1619                 return 0;
1620
1621         if (!link->network)
1622                 return 0;
1623
1624         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1625                 return 0;
1626
1627         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1628         if (r < 0)
1629                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1630
1631         if (link->network->arp >= 0) {
1632                 ifi_change |= IFF_NOARP;
1633                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1634         }
1635
1636         if (link->network->multicast >= 0) {
1637                 ifi_change |= IFF_MULTICAST;
1638                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1639         }
1640
1641         if (link->network->allmulticast >= 0) {
1642                 ifi_change |= IFF_ALLMULTI;
1643                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1644         }
1645
1646         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1647         if (r < 0)
1648                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1649
1650         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1651                                link_netlink_destroy_callback, link);
1652         if (r < 0)
1653                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1654
1655         link_ref(link);
1656
1657         return 0;
1658 }
1659
1660 static int link_acquire_ipv6_conf(Link *link) {
1661         int r;
1662
1663         assert(link);
1664
1665         if (link_ipv6_accept_ra_enabled(link)) {
1666                 assert(link->ndisc);
1667
1668                 log_link_debug(link, "Discovering IPv6 routers");
1669
1670                 r = sd_ndisc_start(link->ndisc);
1671                 if (r < 0 && r != -EBUSY)
1672                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1673         }
1674
1675         if (link_radv_enabled(link)) {
1676                 assert(link->radv);
1677                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1678
1679                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1680
1681                 r = radv_emit_dns(link);
1682                 if (r < 0)
1683                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1684
1685                 r = sd_radv_start(link->radv);
1686                 if (r < 0 && r != -EBUSY)
1687                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1688         }
1689
1690         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1691                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1692                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1693                 assert(link->dhcp6_client);
1694                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1695
1696                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1697                 if (r < 0 && r != -EBUSY)
1698                         return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1699                 else
1700                         log_link_debug(link, "Acquiring DHCPv6 lease");
1701         }
1702
1703         r = dhcp6_request_prefix_delegation(link);
1704         if (r < 0)
1705                 return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m");
1706
1707         return 0;
1708 }
1709
1710 static int link_acquire_ipv4_conf(Link *link) {
1711         int r;
1712
1713         assert(link);
1714         assert(link->manager);
1715         assert(link->manager->event);
1716
1717         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1718                 assert(link->ipv4ll);
1719
1720                 log_link_debug(link, "Acquiring IPv4 link-local address");
1721
1722                 r = sd_ipv4ll_start(link->ipv4ll);
1723                 if (r < 0)
1724                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1725         }
1726
1727         if (link_dhcp4_enabled(link)) {
1728                 assert(link->dhcp_client);
1729
1730                 log_link_debug(link, "Acquiring DHCPv4 lease");
1731
1732                 r = sd_dhcp_client_start(link->dhcp_client);
1733                 if (r < 0)
1734                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1735         }
1736
1737         return 0;
1738 }
1739
1740 static int link_acquire_conf(Link *link) {
1741         int r;
1742
1743         assert(link);
1744
1745         r = link_acquire_ipv4_conf(link);
1746         if (r < 0)
1747                 return r;
1748
1749         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1750                 r = link_acquire_ipv6_conf(link);
1751                 if (r < 0)
1752                         return r;
1753         }
1754
1755         if (link_lldp_emit_enabled(link)) {
1756                 r = link_lldp_emit_start(link);
1757                 if (r < 0)
1758                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1759         }
1760
1761         return 0;
1762 }
1763
1764 bool link_has_carrier(Link *link) {
1765         /* see Documentation/networking/operstates.txt in the kernel sources */
1766
1767         if (link->kernel_operstate == IF_OPER_UP)
1768                 return true;
1769
1770         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1771                 /* operstate may not be implemented, so fall back to flags */
1772                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1773                     !FLAGS_SET(link->flags, IFF_DORMANT))
1774                         return true;
1775
1776         return false;
1777 }
1778
1779 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1780         int r;
1781
1782         assert(link);
1783
1784         link->setting_genmode = false;
1785
1786         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1787                 return 1;
1788
1789         r = sd_netlink_message_get_errno(m);
1790         if (r < 0)
1791                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1792         else
1793                 log_link_debug(link, "Setting address genmode done.");
1794
1795         if (link->state == LINK_STATE_INITIALIZED) {
1796                 r = link_configure_continue(link);
1797                 if (r < 0)
1798                         link_enter_failed(link);
1799         }
1800
1801         return 1;
1802 }
1803
1804 static int link_configure_addrgen_mode(Link *link) {
1805         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1806         uint8_t ipv6ll_mode;
1807         int r;
1808
1809         assert(link);
1810         assert(link->network);
1811         assert(link->manager);
1812         assert(link->manager->rtnl);
1813
1814         if (!socket_ipv6_is_supported() || link->setting_genmode)
1815                 return 0;
1816
1817         log_link_debug(link, "Setting address genmode for link");
1818
1819         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1820         if (r < 0)
1821                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1822
1823         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1824         if (r < 0)
1825                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1826
1827         r = sd_netlink_message_open_container(req, AF_INET6);
1828         if (r < 0)
1829                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1830
1831         if (!link_ipv6ll_enabled(link))
1832                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1833         else if (link->network->ipv6ll_address_gen_mode < 0) {
1834                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1835                 if (r < 0) {
1836                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1837                          * reading the file fails with EIO. */
1838                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1839
1840                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1841                 } else
1842                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1843         } else
1844                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1845
1846         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1847         if (r < 0)
1848                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1849
1850         r = sd_netlink_message_close_container(req);
1851         if (r < 0)
1852                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1853
1854         r = sd_netlink_message_close_container(req);
1855         if (r < 0)
1856                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1857
1858         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_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         link->setting_genmode = true;
1865
1866         return 0;
1867 }
1868
1869 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1870         int r;
1871
1872         assert(link);
1873
1874         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1875                 return 1;
1876
1877         r = sd_netlink_message_get_errno(m);
1878         if (r < 0)
1879                 /* we warn but don't fail the link, as it may be brought up later */
1880                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1881
1882         return 1;
1883 }
1884
1885 static int link_up(Link *link) {
1886         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1887         int r;
1888
1889         assert(link);
1890         assert(link->network);
1891         assert(link->manager);
1892         assert(link->manager->rtnl);
1893
1894         log_link_debug(link, "Bringing link up");
1895
1896         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1897         if (r < 0)
1898                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1899
1900         /* set it free if not enslaved with networkd */
1901         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1902                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1903                 if (r < 0)
1904                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1905         }
1906
1907         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1908         if (r < 0)
1909                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1910
1911         if (link->network->mac) {
1912                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1913                 if (r < 0)
1914                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1915         }
1916
1917         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1918                                link_netlink_destroy_callback, link);
1919         if (r < 0)
1920                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1921
1922         link_ref(link);
1923
1924         return 0;
1925 }
1926
1927 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1928         int r;
1929
1930         assert(link);
1931
1932         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1933                 return 1;
1934
1935         r = sd_netlink_message_get_errno(m);
1936         if (r < 0)
1937                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1938
1939         return 1;
1940 }
1941
1942 int link_down(Link *link, link_netlink_message_handler_t callback) {
1943         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1944         int r;
1945
1946         assert(link);
1947         assert(link->manager);
1948         assert(link->manager->rtnl);
1949
1950         log_link_debug(link, "Bringing link down");
1951
1952         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1953                                      RTM_SETLINK, link->ifindex);
1954         if (r < 0)
1955                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1956
1957         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1958         if (r < 0)
1959                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1960
1961         r = netlink_call_async(link->manager->rtnl, NULL, req,
1962                                callback ?: link_down_handler,
1963                                link_netlink_destroy_callback, link);
1964         if (r < 0)
1965                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1966
1967         link_ref(link);
1968
1969         return 0;
1970 }
1971
1972 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1973         int r;
1974
1975         assert(link);
1976
1977         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1978                 return 1;
1979
1980         r = sd_netlink_message_get_errno(m);
1981         if (r < 0)
1982                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1983
1984         return 1;
1985 }
1986
1987 static int link_set_group(Link *link) {
1988         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1989         int r;
1990
1991         assert(link);
1992         assert(link->network);
1993         assert(link->manager);
1994         assert(link->manager->rtnl);
1995
1996         if (link->network->group <= 0)
1997                 return 0;
1998
1999         log_link_debug(link, "Setting group");
2000
2001         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2002         if (r < 0)
2003                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2004
2005         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
2006         if (r < 0)
2007                 return log_link_error_errno(link, r, "Could not set link group: %m");
2008
2009         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
2010                                link_netlink_destroy_callback, link);
2011         if (r < 0)
2012                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2013
2014         link_ref(link);
2015
2016         return 0;
2017 }
2018
2019 static int link_handle_bound_to_list(Link *link) {
2020         Link *l;
2021         Iterator i;
2022         int r;
2023         bool required_up = false;
2024         bool link_is_up = false;
2025
2026         assert(link);
2027
2028         if (hashmap_isempty(link->bound_to_links))
2029                 return 0;
2030
2031         if (link->flags & IFF_UP)
2032                 link_is_up = true;
2033
2034         HASHMAP_FOREACH (l, link->bound_to_links, i)
2035                 if (link_has_carrier(l)) {
2036                         required_up = true;
2037                         break;
2038                 }
2039
2040         if (!required_up && link_is_up) {
2041                 r = link_down(link, NULL);
2042                 if (r < 0)
2043                         return r;
2044         } else if (required_up && !link_is_up) {
2045                 r = link_up(link);
2046                 if (r < 0)
2047                         return r;
2048         }
2049
2050         return 0;
2051 }
2052
2053 static int link_handle_bound_by_list(Link *link) {
2054         Iterator i;
2055         Link *l;
2056         int r;
2057
2058         assert(link);
2059
2060         if (hashmap_isempty(link->bound_by_links))
2061                 return 0;
2062
2063         HASHMAP_FOREACH (l, link->bound_by_links, i) {
2064                 r = link_handle_bound_to_list(l);
2065                 if (r < 0)
2066                         return r;
2067         }
2068
2069         return 0;
2070 }
2071
2072 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2073         int r;
2074
2075         assert(link);
2076         assert(carrier);
2077
2078         if (link == carrier)
2079                 return 0;
2080
2081         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2082                 return 0;
2083
2084         r = hashmap_ensure_allocated(h, NULL);
2085         if (r < 0)
2086                 return r;
2087
2088         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2089         if (r < 0)
2090                 return r;
2091
2092         return 0;
2093 }
2094
2095 static int link_new_bound_by_list(Link *link) {
2096         Manager *m;
2097         Link *carrier;
2098         Iterator i;
2099         int r;
2100         bool list_updated = false;
2101
2102         assert(link);
2103         assert(link->manager);
2104
2105         m = link->manager;
2106
2107         HASHMAP_FOREACH(carrier, m->links, i) {
2108                 if (!carrier->network)
2109                         continue;
2110
2111                 if (strv_isempty(carrier->network->bind_carrier))
2112                         continue;
2113
2114                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2115                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2116                         if (r < 0)
2117                                 return r;
2118
2119                         list_updated = true;
2120                 }
2121         }
2122
2123         if (list_updated)
2124                 link_dirty(link);
2125
2126         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2127                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2128                 if (r < 0)
2129                         return r;
2130
2131                 link_dirty(carrier);
2132         }
2133
2134         return 0;
2135 }
2136
2137 static int link_new_bound_to_list(Link *link) {
2138         Manager *m;
2139         Link *carrier;
2140         Iterator i;
2141         int r;
2142         bool list_updated = false;
2143
2144         assert(link);
2145         assert(link->manager);
2146
2147         if (!link->network)
2148                 return 0;
2149
2150         if (strv_isempty(link->network->bind_carrier))
2151                 return 0;
2152
2153         m = link->manager;
2154
2155         HASHMAP_FOREACH (carrier, m->links, i) {
2156                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2157                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2158                         if (r < 0)
2159                                 return r;
2160
2161                         list_updated = true;
2162                 }
2163         }
2164
2165         if (list_updated)
2166                 link_dirty(link);
2167
2168         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2169                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2170                 if (r < 0)
2171                         return r;
2172
2173                 link_dirty(carrier);
2174         }
2175
2176         return 0;
2177 }
2178
2179 static int link_new_carrier_maps(Link *link) {
2180         int r;
2181
2182         r = link_new_bound_by_list(link);
2183         if (r < 0)
2184                 return r;
2185
2186         r = link_handle_bound_by_list(link);
2187         if (r < 0)
2188                 return r;
2189
2190         r = link_new_bound_to_list(link);
2191         if (r < 0)
2192                 return r;
2193
2194         r = link_handle_bound_to_list(link);
2195         if (r < 0)
2196                 return r;
2197
2198         return 0;
2199 }
2200
2201 static void link_free_bound_to_list(Link *link) {
2202         Link *bound_to;
2203         Iterator i;
2204
2205         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2206                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2207
2208                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2209                         link_dirty(bound_to);
2210         }
2211
2212         return;
2213 }
2214
2215 static void link_free_bound_by_list(Link *link) {
2216         Link *bound_by;
2217         Iterator i;
2218
2219         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2220                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2221
2222                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2223                         link_dirty(bound_by);
2224                         link_handle_bound_to_list(bound_by);
2225                 }
2226         }
2227
2228         return;
2229 }
2230
2231 static void link_free_carrier_maps(Link *link) {
2232         bool list_updated = false;
2233
2234         assert(link);
2235
2236         if (!hashmap_isempty(link->bound_to_links)) {
2237                 link_free_bound_to_list(link);
2238                 list_updated = true;
2239         }
2240
2241         if (!hashmap_isempty(link->bound_by_links)) {
2242                 link_free_bound_by_list(link);
2243                 list_updated = true;
2244         }
2245
2246         if (list_updated)
2247                 link_dirty(link);
2248
2249         return;
2250 }
2251
2252 static int link_append_to_master(Link *link, NetDev *netdev) {
2253         Link *master;
2254         int r;
2255
2256         assert(link);
2257         assert(netdev);
2258
2259         r = link_get(link->manager, netdev->ifindex, &master);
2260         if (r < 0)
2261                 return r;
2262
2263         r = set_ensure_put(&master->slaves, NULL, link);
2264         if (r <= 0)
2265                 return r;
2266
2267         link_ref(link);
2268         return 0;
2269 }
2270
2271 static void link_drop_from_master(Link *link, NetDev *netdev) {
2272         Link *master;
2273
2274         assert(link);
2275
2276         if (!link->manager || !netdev)
2277                 return;
2278
2279         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2280                 return;
2281
2282         link_unref(set_remove(master->slaves, link));
2283 }
2284
2285 static void link_detach_from_manager(Link *link) {
2286         if (!link || !link->manager)
2287                 return;
2288
2289         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2290         link_clean(link);
2291
2292         /* The following must be called at last. */
2293         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2294         link_unref(link);
2295 }
2296
2297 void link_drop(Link *link) {
2298         if (!link || link->state == LINK_STATE_LINGER)
2299                 return;
2300
2301         link_set_state(link, LINK_STATE_LINGER);
2302
2303         link_free_carrier_maps(link);
2304
2305         if (link->network) {
2306                 link_drop_from_master(link, link->network->bridge);
2307                 link_drop_from_master(link, link->network->bond);
2308         }
2309
2310         log_link_debug(link, "Link removed");
2311
2312         (void) unlink(link->state_file);
2313         link_detach_from_manager(link);
2314 }
2315
2316 static int link_joined(Link *link) {
2317         int r;
2318
2319         assert(link);
2320         assert(link->network);
2321
2322         if (!hashmap_isempty(link->bound_to_links)) {
2323                 r = link_handle_bound_to_list(link);
2324                 if (r < 0)
2325                         return r;
2326         } else if (!(link->flags & IFF_UP)) {
2327                 r = link_up(link);
2328                 if (r < 0) {
2329                         link_enter_failed(link);
2330                         return r;
2331                 }
2332         }
2333
2334         if (link->network->bridge) {
2335                 r = link_set_bridge(link);
2336                 if (r < 0)
2337                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2338
2339                 r = link_append_to_master(link, link->network->bridge);
2340                 if (r < 0)
2341                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2342         }
2343
2344         if (link->network->bond) {
2345                 r = link_set_bond(link);
2346                 if (r < 0)
2347                         log_link_error_errno(link, r, "Could not set bond message: %m");
2348
2349                 r = link_append_to_master(link, link->network->bond);
2350                 if (r < 0)
2351                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2352         }
2353
2354         if (link->network->use_br_vlan &&
2355             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2356                 r = link_set_bridge_vlan(link);
2357                 if (r < 0)
2358                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2359         }
2360
2361         /* Skip setting up addresses until it gets carrier,
2362            or it would try to set addresses twice,
2363            which is bad for non-idempotent steps. */
2364         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2365                 return 0;
2366
2367         link_set_state(link, LINK_STATE_CONFIGURING);
2368         return link_request_set_addresses(link);
2369 }
2370
2371 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2372         int r;
2373
2374         assert(link);
2375         assert(link->network);
2376         assert(link->enslaving > 0);
2377
2378         link->enslaving--;
2379
2380         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2381                 return 1;
2382
2383         r = sd_netlink_message_get_errno(m);
2384         if (r < 0 && r != -EEXIST) {
2385                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2386                 link_enter_failed(link);
2387                 return 1;
2388         }
2389
2390         log_link_debug(link, "Joined netdev");
2391
2392         if (link->enslaving == 0) {
2393                 r = link_joined(link);
2394                 if (r < 0)
2395                         link_enter_failed(link);
2396         }
2397
2398         return 1;
2399 }
2400
2401 static int link_enter_join_netdev(Link *link) {
2402         NetDev *netdev;
2403         Iterator i;
2404         int r;
2405
2406         assert(link);
2407         assert(link->network);
2408         assert(link->state == LINK_STATE_INITIALIZED);
2409
2410         link_set_state(link, LINK_STATE_CONFIGURING);
2411
2412         link_dirty(link);
2413         link->enslaving = 0;
2414
2415         if (link->network->bond) {
2416                 if (link->network->bond->state == NETDEV_STATE_READY &&
2417                     link->network->bond->ifindex == link->master_ifindex)
2418                         return link_joined(link);
2419
2420                 log_struct(LOG_DEBUG,
2421                            LOG_LINK_INTERFACE(link),
2422                            LOG_NETDEV_INTERFACE(link->network->bond),
2423                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2424
2425                 link->enslaving++;
2426
2427                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2428                 if (r < 0) {
2429                         log_struct_errno(LOG_WARNING, r,
2430                                          LOG_LINK_INTERFACE(link),
2431                                          LOG_NETDEV_INTERFACE(link->network->bond),
2432                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2433                         link_enter_failed(link);
2434                         return r;
2435                 }
2436         }
2437
2438         if (link->network->bridge) {
2439                 log_struct(LOG_DEBUG,
2440                            LOG_LINK_INTERFACE(link),
2441                            LOG_NETDEV_INTERFACE(link->network->bridge),
2442                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2443
2444                 link->enslaving++;
2445
2446                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2447                 if (r < 0) {
2448                         log_struct_errno(LOG_WARNING, r,
2449                                          LOG_LINK_INTERFACE(link),
2450                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2451                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2452                         link_enter_failed(link);
2453                         return r;
2454                 }
2455         }
2456
2457         if (link->network->vrf) {
2458                 log_struct(LOG_DEBUG,
2459                            LOG_LINK_INTERFACE(link),
2460                            LOG_NETDEV_INTERFACE(link->network->vrf),
2461                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2462
2463                 link->enslaving++;
2464
2465                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2466                 if (r < 0) {
2467                         log_struct_errno(LOG_WARNING, r,
2468                                          LOG_LINK_INTERFACE(link),
2469                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2470                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2471                         link_enter_failed(link);
2472                         return r;
2473                 }
2474         }
2475
2476         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2477
2478                 if (netdev->ifindex > 0)
2479                         /* Assume already enslaved. */
2480                         continue;
2481
2482                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2483                         continue;
2484
2485                 log_struct(LOG_DEBUG,
2486                            LOG_LINK_INTERFACE(link),
2487                            LOG_NETDEV_INTERFACE(netdev),
2488                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2489
2490                 link->enslaving++;
2491
2492                 r = netdev_join(netdev, link, netdev_join_handler);
2493                 if (r < 0) {
2494                         log_struct_errno(LOG_WARNING, r,
2495                                          LOG_LINK_INTERFACE(link),
2496                                          LOG_NETDEV_INTERFACE(netdev),
2497                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2498                         link_enter_failed(link);
2499                         return r;
2500                 }
2501         }
2502
2503         if (link->enslaving == 0)
2504                 return link_joined(link);
2505
2506         return 0;
2507 }
2508
2509 static int link_set_ipv4_forward(Link *link) {
2510         int r;
2511
2512         if (!link_ipv4_forward_enabled(link))
2513                 return 0;
2514
2515         /* We propagate the forwarding flag from one interface to the
2516          * global setting one way. This means: as long as at least one
2517          * interface was configured at any time that had IP forwarding
2518          * enabled the setting will stay on for good. We do this
2519          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2520          * somewhat in sync (see below). */
2521
2522         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2523         if (r < 0)
2524                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2525
2526         return 0;
2527 }
2528
2529 static int link_set_ipv6_forward(Link *link) {
2530         int r;
2531
2532         if (!link_ipv6_forward_enabled(link))
2533                 return 0;
2534
2535         /* On Linux, the IPv6 stack does not know a per-interface
2536          * packet forwarding setting: either packet forwarding is on
2537          * for all, or off for all. We hence don't bother with a
2538          * per-interface setting, but simply propagate the interface
2539          * flag, if it is set, to the global flag, one-way. Note that
2540          * while IPv4 would allow a per-interface flag, we expose the
2541          * same behaviour there and also propagate the setting from
2542          * one to all, to keep things simple (see above). */
2543
2544         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2545         if (r < 0)
2546                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2547
2548         return 0;
2549 }
2550
2551 static int link_set_ipv6_privacy_extensions(Link *link) {
2552         IPv6PrivacyExtensions s;
2553         int r;
2554
2555         s = link_ipv6_privacy_extensions(link);
2556         if (s < 0)
2557                 return 0;
2558
2559         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2560         if (r < 0)
2561                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2562
2563         return 0;
2564 }
2565
2566 static int link_set_ipv6_accept_ra(Link *link) {
2567         int r;
2568
2569         /* Make this a NOP if IPv6 is not available */
2570         if (!socket_ipv6_is_supported())
2571                 return 0;
2572
2573         if (link->flags & IFF_LOOPBACK)
2574                 return 0;
2575
2576         if (!link->network)
2577                 return 0;
2578
2579         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2580         if (r < 0)
2581                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2582
2583         return 0;
2584 }
2585
2586 static int link_set_ipv6_dad_transmits(Link *link) {
2587         int r;
2588
2589         /* Make this a NOP if IPv6 is not available */
2590         if (!socket_ipv6_is_supported())
2591                 return 0;
2592
2593         if (link->flags & IFF_LOOPBACK)
2594                 return 0;
2595
2596         if (!link->network)
2597                 return 0;
2598
2599         if (link->network->ipv6_dad_transmits < 0)
2600                 return 0;
2601
2602         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2603         if (r < 0)
2604                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2605
2606         return 0;
2607 }
2608
2609 static int link_set_ipv6_hop_limit(Link *link) {
2610         int r;
2611
2612         /* Make this a NOP if IPv6 is not available */
2613         if (!socket_ipv6_is_supported())
2614                 return 0;
2615
2616         if (link->flags & IFF_LOOPBACK)
2617                 return 0;
2618
2619         if (!link->network)
2620                 return 0;
2621
2622         if (link->network->ipv6_hop_limit < 0)
2623                 return 0;
2624
2625         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2626         if (r < 0)
2627                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2628
2629         return 0;
2630 }
2631
2632 static int link_set_ipv6_mtu(Link *link) {
2633         int r;
2634
2635         /* Make this a NOP if IPv6 is not available */
2636         if (!socket_ipv6_is_supported())
2637                 return 0;
2638
2639         if (link->flags & IFF_LOOPBACK)
2640                 return 0;
2641
2642         if (link->network->ipv6_mtu == 0)
2643                 return 0;
2644
2645         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2646          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2647         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2648                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2649                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2650         }
2651
2652         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2653         if (r < 0) {
2654                 if (link->mtu < link->network->ipv6_mtu)
2655                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2656                                          link->network->ipv6_mtu, link->mtu);
2657                 else
2658                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2659         }
2660
2661         link->ipv6_mtu_set = true;
2662
2663         return 0;
2664 }
2665
2666 static int link_set_ipv4_accept_local(Link *link) {
2667         int r;
2668
2669         if (link->flags & IFF_LOOPBACK)
2670                 return 0;
2671
2672         if (link->network->ipv4_accept_local < 0)
2673                 return 0;
2674
2675         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2676         if (r < 0)
2677                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2678
2679         return 0;
2680 }
2681
2682 static bool link_is_static_address_configured(Link *link, Address *address) {
2683         Address *net_address;
2684
2685         assert(link);
2686         assert(address);
2687
2688         if (!link->network)
2689                 return false;
2690
2691         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2692                 if (address_equal(net_address, address))
2693                         return true;
2694                 else if (address->family == AF_INET6 && net_address->family == AF_INET6 &&
2695                          in_addr_equal(AF_INET6, &address->in_addr, &net_address->in_addr_peer) > 0)
2696                         return true;
2697
2698         return false;
2699 }
2700
2701 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2702         Neighbor *net_neighbor;
2703
2704         assert(link);
2705         assert(neighbor);
2706
2707         if (!link->network)
2708                 return false;
2709
2710         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2711                 if (neighbor_equal(net_neighbor, neighbor))
2712                         return true;
2713
2714         return false;
2715 }
2716
2717 static bool link_is_static_route_configured(Link *link, Route *route) {
2718         Route *net_route;
2719
2720         assert(link);
2721         assert(route);
2722
2723         if (!link->network)
2724                 return false;
2725
2726         LIST_FOREACH(routes, net_route, link->network->static_routes)
2727                 if (route_equal(net_route, route))
2728                         return true;
2729
2730         return false;
2731 }
2732
2733 static bool link_address_is_dynamic(Link *link, Address *address) {
2734         Route *route;
2735         Iterator i;
2736
2737         assert(link);
2738         assert(address);
2739
2740         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2741                 return true;
2742
2743         /* Even when the address is leased from a DHCP server, networkd assign the address
2744          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2745          * corresponding routes with RTPROT_DHCP. */
2746         SET_FOREACH(route, link->routes_foreign, i) {
2747                 if (route->protocol != RTPROT_DHCP)
2748                         continue;
2749
2750                 if (address->family != route->family)
2751                         continue;
2752
2753                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2754                         return true;
2755         }
2756
2757         return false;
2758 }
2759
2760 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2761         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2762         sd_netlink_message *addr;
2763         int r;
2764
2765         assert(link);
2766         assert(link->manager);
2767         assert(link->manager->rtnl);
2768
2769         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2770         if (r < 0)
2771                 return r;
2772
2773         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2774         if (r < 0)
2775                 return r;
2776
2777         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2778                 unsigned char flags;
2779                 int ifindex;
2780
2781                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2782                 if (r < 0) {
2783                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2784                         continue;
2785                 } else if (link->ifindex != ifindex)
2786                         continue;
2787
2788                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2789                 if (r < 0) {
2790                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2791                         continue;
2792                 } else if (!(flags & IFA_F_TENTATIVE))
2793                         continue;
2794
2795                 log_link_debug(link, "Found tentative ipv6 link-local address");
2796                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2797         }
2798
2799         return 0;
2800 }
2801
2802 static int link_drop_foreign_config(Link *link) {
2803         Address *address;
2804         Neighbor *neighbor;
2805         Route *route;
2806         Iterator i;
2807         int r;
2808
2809         /* The kernel doesn't notify us about tentative addresses;
2810          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2811         if (!link_ipv6ll_enabled(link)) {
2812                 r = link_enumerate_ipv6_tentative_addresses(link);
2813                 if (r < 0)
2814                         return r;
2815         }
2816
2817         SET_FOREACH(address, link->addresses_foreign, i) {
2818                 /* we consider IPv6LL addresses to be managed by the kernel */
2819                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2820                         continue;
2821
2822                 if (link_address_is_dynamic(link, address)) {
2823                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2824                                 continue;
2825                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2826                         continue;
2827
2828                 if (link_is_static_address_configured(link, address)) {
2829                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2830                         if (r < 0)
2831                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2832                 } else {
2833                         r = address_remove(address, link, NULL);
2834                         if (r < 0)
2835                                 return r;
2836                 }
2837         }
2838
2839         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2840                 if (link_is_neighbor_configured(link, neighbor)) {
2841                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2842                         if (r < 0)
2843                                 return r;
2844                 } else {
2845                         r = neighbor_remove(neighbor, link, NULL);
2846                         if (r < 0)
2847                                 return r;
2848                 }
2849         }
2850
2851         SET_FOREACH(route, link->routes_foreign, i) {
2852                 /* do not touch routes managed by the kernel */
2853                 if (route->protocol == RTPROT_KERNEL)
2854                         continue;
2855
2856                 /* do not touch multicast route added by kernel */
2857                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2858                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2859                 if (route->protocol == RTPROT_BOOT &&
2860                     route->family == AF_INET6 &&
2861                     route->dst_prefixlen == 8 &&
2862                     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 }}} }))
2863                         continue;
2864
2865                 if (route->protocol == RTPROT_STATIC && link->network &&
2866                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2867                         continue;
2868
2869                 if (route->protocol == RTPROT_DHCP && link->network &&
2870                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2871                         continue;
2872
2873                 if (link_is_static_route_configured(link, route)) {
2874                         r = route_add(link, route, NULL);
2875                         if (r < 0)
2876                                 return r;
2877                 } else {
2878                         r = route_remove(route, link, NULL);
2879                         if (r < 0)
2880                                 return r;
2881                 }
2882         }
2883
2884         return 0;
2885 }
2886
2887 static int link_drop_config(Link *link) {
2888         Address *address, *pool_address;
2889         Neighbor *neighbor;
2890         Route *route;
2891         Iterator i;
2892         int r;
2893
2894         SET_FOREACH(address, link->addresses, i) {
2895                 /* we consider IPv6LL addresses to be managed by the kernel */
2896                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2897                         continue;
2898
2899                 r = address_remove(address, link, NULL);
2900                 if (r < 0)
2901                         return r;
2902
2903                 /* If this address came from an address pool, clean up the pool */
2904                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2905                         if (address_equal(address, pool_address)) {
2906                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2907                                 address_free(pool_address);
2908                                 break;
2909                         }
2910                 }
2911         }
2912
2913         SET_FOREACH(neighbor, link->neighbors, i) {
2914                 r = neighbor_remove(neighbor, link, NULL);
2915                 if (r < 0)
2916                         return r;
2917         }
2918
2919         SET_FOREACH(route, link->routes, i) {
2920                 /* do not touch routes managed by the kernel */
2921                 if (route->protocol == RTPROT_KERNEL)
2922                         continue;
2923
2924                 r = route_remove(route, link, NULL);
2925                 if (r < 0)
2926                         return r;
2927         }
2928
2929         ndisc_flush(link);
2930
2931         return 0;
2932 }
2933
2934 static int link_configure_ipv4_dad(Link *link) {
2935         Address *address;
2936         int r;
2937
2938         assert(link);
2939         assert(link->network);
2940
2941         LIST_FOREACH(addresses, address, link->network->static_addresses)
2942                 if (address->family == AF_INET &&
2943                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2944                         r = configure_ipv4_duplicate_address_detection(link, address);
2945                         if (r < 0)
2946                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2947                 }
2948
2949         return 0;
2950 }
2951
2952 static int link_configure_traffic_control(Link *link) {
2953         TrafficControl *tc;
2954         Iterator i;
2955         int r;
2956
2957         link->tc_configured = false;
2958         link->tc_messages = 0;
2959
2960         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2961                 r = traffic_control_configure(link, tc);
2962                 if (r < 0)
2963                         return r;
2964         }
2965
2966         if (link->tc_messages == 0)
2967                 link->tc_configured = true;
2968         else
2969                 log_link_debug(link, "Configuring traffic control");
2970
2971         return 0;
2972 }
2973
2974 static int link_configure_sr_iov(Link *link) {
2975         SRIOV *sr_iov;
2976         Iterator i;
2977         int r;
2978
2979         link->sr_iov_configured = false;
2980         link->sr_iov_messages = 0;
2981
2982         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
2983                 r = sr_iov_configure(link, sr_iov);
2984                 if (r < 0)
2985                         return r;
2986         }
2987
2988         if (link->sr_iov_messages == 0)
2989                 link->sr_iov_configured = true;
2990         else
2991                 log_link_debug(link, "Configuring SR-IOV");
2992
2993         return 0;
2994 }
2995
2996 static int link_configure(Link *link) {
2997         int r;
2998
2999         assert(link);
3000         assert(link->network);
3001         assert(link->state == LINK_STATE_INITIALIZED);
3002
3003         r = link_configure_traffic_control(link);
3004         if (r < 0)
3005                 return r;
3006
3007         r = link_configure_sr_iov(link);
3008         if (r < 0)
3009                 return r;
3010
3011         if (link->iftype == ARPHRD_CAN)
3012                 return link_configure_can(link);
3013
3014         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
3015          * for this interface, then enable IPv6 */
3016         (void) link_update_ipv6_sysctl(link);
3017
3018         r = link_set_proxy_arp(link);
3019         if (r < 0)
3020                return r;
3021
3022         r = ipv6_proxy_ndp_addresses_configure(link);
3023         if (r < 0)
3024                 return r;
3025
3026         r = link_set_ipv4_forward(link);
3027         if (r < 0)
3028                 return r;
3029
3030         r = link_set_ipv6_forward(link);
3031         if (r < 0)
3032                 return r;
3033
3034         r = link_set_ipv6_privacy_extensions(link);
3035         if (r < 0)
3036                 return r;
3037
3038         r = link_set_ipv6_accept_ra(link);
3039         if (r < 0)
3040                 return r;
3041
3042         r = link_set_ipv6_dad_transmits(link);
3043         if (r < 0)
3044                 return r;
3045
3046         r = link_set_ipv6_hop_limit(link);
3047         if (r < 0)
3048                 return r;
3049
3050         r = link_set_ipv4_accept_local(link);
3051         if (r < 0)
3052                 return r;
3053
3054         r = link_set_flags(link);
3055         if (r < 0)
3056                 return r;
3057
3058         r = link_set_group(link);
3059         if (r < 0)
3060                 return r;
3061
3062         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
3063                 r = ipv4ll_configure(link);
3064                 if (r < 0)
3065                         return r;
3066         }
3067
3068         if (link_dhcp4_enabled(link)) {
3069                 r = dhcp4_set_promote_secondaries(link);
3070                 if (r < 0)
3071                         return r;
3072
3073                 r = dhcp4_configure(link);
3074                 if (r < 0)
3075                         return r;
3076         }
3077
3078         if (link_dhcp4_server_enabled(link)) {
3079                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3080                 if (r < 0)
3081                         return r;
3082
3083                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3084                 if (r < 0)
3085                         return r;
3086         }
3087
3088         if (link_dhcp6_enabled(link) ||
3089             link_ipv6_accept_ra_enabled(link)) {
3090                 r = dhcp6_configure(link);
3091                 if (r < 0)
3092                         return r;
3093         }
3094
3095         if (link_ipv6_accept_ra_enabled(link)) {
3096                 r = ndisc_configure(link);
3097                 if (r < 0)
3098                         return r;
3099         }
3100
3101         if (link_radv_enabled(link)) {
3102                 r = radv_configure(link);
3103                 if (r < 0)
3104                         return r;
3105         }
3106
3107         if (link_lldp_rx_enabled(link)) {
3108                 r = link_lldp_rx_configure(link);
3109                 if (r < 0)
3110                         return r;
3111         }
3112
3113         r = link_configure_mtu(link);
3114         if (r < 0)
3115                 return r;
3116
3117         r = link_configure_addrgen_mode(link);
3118         if (r < 0)
3119                 return r;
3120
3121         r = link_configure_ipv4_dad(link);
3122         if (r < 0)
3123                 return r;
3124
3125         return link_configure_continue(link);
3126 }
3127
3128 /* The configuration continues in this separate function, instead of
3129  * including this in the above link_configure() function, for two
3130  * reasons:
3131  * 1) some devices reset the link when the mtu is set, which caused
3132  *    an infinite loop here in networkd; see:
3133  *    https://github.com/systemd/systemd/issues/6593
3134  *    https://github.com/systemd/systemd/issues/9831
3135  * 2) if ipv6ll is disabled, then bringing the interface up must be
3136  *    delayed until after we get confirmation from the kernel that
3137  *    the addr_gen_mode parameter has been set (via netlink), see:
3138  *    https://github.com/systemd/systemd/issues/13882
3139  */
3140 static int link_configure_continue(Link *link) {
3141         int r;
3142
3143         assert(link);
3144         assert(link->network);
3145         assert(link->state == LINK_STATE_INITIALIZED);
3146
3147         if (link->setting_mtu || link->setting_genmode)
3148                 return 0;
3149
3150         /* Drop foreign config, but ignore loopback or critical devices.
3151          * We do not want to remove loopback address or addresses used for root NFS. */
3152         if (!(link->flags & IFF_LOOPBACK) &&
3153             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3154                 r = link_drop_foreign_config(link);
3155                 if (r < 0)
3156                         return r;
3157         }
3158
3159         /* The kernel resets ipv6 mtu after changing device mtu;
3160          * we must set this here, after we've set device mtu */
3161         r = link_set_ipv6_mtu(link);
3162         if (r < 0)
3163                 return r;
3164
3165         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3166                 r = link_acquire_conf(link);
3167                 if (r < 0)
3168                         return r;
3169         }
3170
3171         return link_enter_join_netdev(link);
3172 }
3173
3174 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3175         assert(duid);
3176
3177         if (duid->raw_data_len > 0)
3178                 return 0;
3179
3180         if (duid->type != DUID_TYPE_UUID)
3181                 return -EINVAL;
3182
3183         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3184         duid->raw_data_len = sizeof(sd_id128_t);
3185
3186         return 1;
3187 }
3188
3189 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3190         Manager *manager = userdata;
3191         const sd_bus_error *e;
3192         const void *a;
3193         size_t sz;
3194         DUID *duid;
3195         Link *link;
3196         int r;
3197
3198         assert(m);
3199         assert(manager);
3200
3201         e = sd_bus_message_get_error(m);
3202         if (e) {
3203                 log_error_errno(sd_bus_error_get_errno(e),
3204                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3205                                 e->message);
3206                 goto configure;
3207         }
3208
3209         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3210         if (r < 0)
3211                 goto configure;
3212
3213         if (sz != sizeof(sd_id128_t)) {
3214                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3215                 goto configure;
3216         }
3217
3218         memcpy(&manager->product_uuid, a, sz);
3219         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3220                 (void) duid_set_uuid(duid, manager->product_uuid);
3221
3222         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3223
3224 configure:
3225         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3226                 link_unref(link);
3227
3228                 r = link_configure(link);
3229                 if (r < 0)
3230                         link_enter_failed(link);
3231         }
3232
3233         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3234
3235         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3236          * even if the method fails. */
3237         manager->has_product_uuid = true;
3238
3239         return 1;
3240 }
3241
3242 static bool link_requires_uuid(Link *link) {
3243         const DUID *duid;
3244
3245         assert(link);
3246         assert(link->manager);
3247         assert(link->network);
3248
3249         duid = link_get_duid(link);
3250         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3251                 return false;
3252
3253         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3254                 return true;
3255
3256         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3257                 return true;
3258
3259         return false;
3260 }
3261
3262 static int link_configure_duid(Link *link) {
3263         Manager *m;
3264         DUID *duid;
3265         int r;
3266
3267         assert(link);
3268         assert(link->manager);
3269         assert(link->network);
3270
3271         m = link->manager;
3272         duid = link_get_duid(link);
3273
3274         if (!link_requires_uuid(link))
3275                 return 1;
3276
3277         if (m->has_product_uuid) {
3278                 (void) duid_set_uuid(duid, m->product_uuid);
3279                 return 1;
3280         }
3281
3282         if (!m->links_requesting_uuid) {
3283                 r = manager_request_product_uuid(m, link);
3284                 if (r < 0) {
3285                         if (r == -ENOMEM)
3286                                 return r;
3287
3288                         log_link_warning_errno(link, r,
3289                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3290                         return 1;
3291                 }
3292         } else {
3293                 r = set_put(m->links_requesting_uuid, link);
3294                 if (r < 0)
3295                         return log_oom();
3296                 if (r > 0)
3297                         link_ref(link);
3298
3299                 r = set_put(m->duids_requesting_uuid, duid);
3300                 if (r < 0)
3301                         return log_oom();
3302         }
3303
3304         return 0;
3305 }
3306
3307 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3308         Network *network;
3309         int r;
3310
3311         if (m) {
3312                 _cleanup_strv_free_ char **s = NULL;
3313
3314                 r = sd_netlink_message_get_errno(m);
3315                 if (r < 0)
3316                         return r;
3317
3318                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3319                 if (r < 0 && r != -ENODATA)
3320                         return r;
3321
3322                 strv_free_and_replace(link->alternative_names, s);
3323         }
3324
3325         r = network_get(link->manager, link->iftype, link->sd_device,
3326                         link->ifname, link->alternative_names, link->driver,
3327                         &link->mac, &link->permanent_mac,
3328                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3329         if (r == -ENOENT) {
3330                 link_enter_unmanaged(link);
3331                 return 0;
3332         } else if (r == 0 && network->unmanaged) {
3333                 link_enter_unmanaged(link);
3334                 return 0;
3335         } else if (r < 0)
3336                 return r;
3337
3338         if (link->network == network && !force)
3339                 return 0;
3340
3341         log_link_info(link, "Re-configuring with %s", network->filename);
3342
3343         /* Dropping old .network file */
3344         r = link_stop_clients(link, false);
3345         if (r < 0)
3346                 return r;
3347
3348         if (link_dhcp4_server_enabled(link))
3349                 (void) sd_dhcp_server_stop(link->dhcp_server);
3350
3351         r = link_drop_config(link);
3352         if (r < 0)
3353                 return r;
3354
3355         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3356                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3357                 r = link_drop_foreign_config(link);
3358                 if (r < 0)
3359                         return r;
3360         }
3361
3362         link_free_carrier_maps(link);
3363         link_free_engines(link);
3364         link->network = network_unref(link->network);
3365
3366         /* Then, apply new .network file */
3367         r = network_apply(network, link);
3368         if (r < 0)
3369                 return r;
3370
3371         r = link_new_carrier_maps(link);
3372         if (r < 0)
3373                 return r;
3374
3375         link_set_state(link, LINK_STATE_INITIALIZED);
3376         link_dirty(link);
3377
3378         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3379          * link_configure() is called later asynchronously. */
3380         r = link_configure_duid(link);
3381         if (r <= 0)
3382                 return r;
3383
3384         r = link_configure(link);
3385         if (r < 0)
3386                 return r;
3387
3388         return 0;
3389 }
3390
3391 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3392         int r;
3393
3394         r = link_reconfigure_internal(link, m, false);
3395         if (r < 0)
3396                 link_enter_failed(link);
3397
3398         return 1;
3399 }
3400
3401 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3402         int r;
3403
3404         r = link_reconfigure_internal(link, m, true);
3405         if (r < 0)
3406                 link_enter_failed(link);
3407
3408         return 1;
3409 }
3410
3411 int link_reconfigure(Link *link, bool force) {
3412         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3413         int r;
3414
3415         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3416                 return 0;
3417
3418         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3419                                      link->ifindex);
3420         if (r < 0)
3421                 return r;
3422
3423         r = netlink_call_async(link->manager->rtnl, NULL, req,
3424                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3425                                link_netlink_destroy_callback, link);
3426         if (r < 0)
3427                 return r;
3428
3429         link_ref(link);
3430
3431         return 0;
3432 }
3433
3434 static int link_initialized_and_synced(Link *link) {
3435         Network *network;
3436         int r;
3437
3438         assert(link);
3439         assert(link->ifname);
3440         assert(link->manager);
3441
3442         /* We may get called either from the asynchronous netlink callback,
3443          * or directly for link_add() if running in a container. See link_add(). */
3444         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3445                 return 0;
3446
3447         log_link_debug(link, "Link state is up-to-date");
3448         link_set_state(link, LINK_STATE_INITIALIZED);
3449
3450         r = link_new_bound_by_list(link);
3451         if (r < 0)
3452                 return r;
3453
3454         r = link_handle_bound_by_list(link);
3455         if (r < 0)
3456                 return r;
3457
3458         if (!link->network) {
3459                 r = wifi_get_info(link);
3460                 if (r < 0)
3461                         return r;
3462
3463                 r = network_get(link->manager, link->iftype, link->sd_device,
3464                                 link->ifname, link->alternative_names, link->driver,
3465                                 &link->mac, &link->permanent_mac,
3466                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3467                 if (r == -ENOENT) {
3468                         link_enter_unmanaged(link);
3469                         return 0;
3470                 } else if (r == 0 && network->unmanaged) {
3471                         link_enter_unmanaged(link);
3472                         return 0;
3473                 } else if (r < 0)
3474                         return r;
3475
3476                 if (link->flags & IFF_LOOPBACK) {
3477                         if (network->link_local != ADDRESS_FAMILY_NO)
3478                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3479
3480                         if (network->dhcp != ADDRESS_FAMILY_NO)
3481                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3482
3483                         if (network->dhcp_server)
3484                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3485                 }
3486
3487                 r = network_apply(network, link);
3488                 if (r < 0)
3489                         return r;
3490         }
3491
3492         r = link_new_bound_to_list(link);
3493         if (r < 0)
3494                 return r;
3495
3496         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3497          * link_configure() is called later asynchronously. */
3498         r = link_configure_duid(link);
3499         if (r <= 0)
3500                 return r;
3501
3502         r = link_configure(link);
3503         if (r < 0)
3504                 return r;
3505
3506         return 0;
3507 }
3508
3509 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3510         _cleanup_strv_free_ char **s = NULL;
3511         int r;
3512
3513         r = sd_netlink_message_get_errno(m);
3514         if (r < 0) {
3515                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3516                 link_enter_failed(link);
3517                 return 0;
3518         }
3519
3520         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3521         if (r < 0 && r != -ENODATA) {
3522                 link_enter_failed(link);
3523                 return 0;
3524         }
3525
3526         strv_free_and_replace(link->alternative_names, s);
3527
3528         r = link_initialized_and_synced(link);
3529         if (r < 0)
3530                 link_enter_failed(link);
3531         return 1;
3532 }
3533
3534 int link_initialized(Link *link, sd_device *device) {
3535         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3536         int r;
3537
3538         assert(link);
3539         assert(link->manager);
3540         assert(link->manager->rtnl);
3541         assert(device);
3542
3543         if (link->state != LINK_STATE_PENDING)
3544                 return 0;
3545
3546         if (link->sd_device)
3547                 return 0;
3548
3549         log_link_debug(link, "udev initialized link");
3550         link_set_state(link, LINK_STATE_INITIALIZED);
3551
3552         link->sd_device = sd_device_ref(device);
3553
3554         /* udev has initialized the link, but we don't know if we have yet
3555          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3556          * when it returns we know that the pending NEWLINKs have already been
3557          * processed and that we are up-to-date */
3558
3559         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3560                                      link->ifindex);
3561         if (r < 0)
3562                 return r;
3563
3564         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3565                                link_netlink_destroy_callback, link);
3566         if (r < 0)
3567                 return r;
3568
3569         link_ref(link);
3570
3571         return 0;
3572 }
3573
3574 static int link_load(Link *link) {
3575         _cleanup_free_ char *network_file = NULL,
3576                             *addresses = NULL,
3577                             *routes = NULL,
3578                             *dhcp4_address = NULL,
3579                             *ipv4ll_address = NULL;
3580         union in_addr_union address;
3581         int r;
3582
3583         assert(link);
3584
3585         r = parse_env_file(NULL, link->state_file,
3586                            "NETWORK_FILE", &network_file,
3587                            "ADDRESSES", &addresses,
3588                            "ROUTES", &routes,
3589                            "DHCP4_ADDRESS", &dhcp4_address,
3590                            "IPV4LL_ADDRESS", &ipv4ll_address);
3591         if (r < 0 && r != -ENOENT)
3592                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3593
3594         if (network_file) {
3595                 Network *network;
3596                 char *suffix;
3597
3598                 /* drop suffix */
3599                 suffix = strrchr(network_file, '.');
3600                 if (!suffix) {
3601                         log_link_debug(link, "Failed to get network name from %s", network_file);
3602                         goto network_file_fail;
3603                 }
3604                 *suffix = '\0';
3605
3606                 r = network_get_by_name(link->manager, basename(network_file), &network);
3607                 if (r < 0) {
3608                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3609                         goto network_file_fail;
3610                 }
3611
3612                 r = network_apply(network, link);
3613                 if (r < 0)
3614                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3615         }
3616
3617 network_file_fail:
3618
3619         for (const char *p = addresses; p; ) {
3620                 _cleanup_free_ char *address_str = NULL;
3621                 char *prefixlen_str;
3622                 int family;
3623                 unsigned char prefixlen;
3624
3625                 r = extract_first_word(&p, &address_str, NULL, 0);
3626                 if (r < 0)
3627                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3628                 if (r <= 0)
3629                         break;
3630
3631                 prefixlen_str = strchr(address_str, '/');
3632                 if (!prefixlen_str) {
3633                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3634                         continue;
3635                 }
3636                 *prefixlen_str++ = '\0';
3637
3638                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3639                 if (r != 1) {
3640                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3641                         continue;
3642                 }
3643
3644                 r = in_addr_from_string_auto(address_str, &family, &address);
3645                 if (r < 0) {
3646                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3647                         continue;
3648                 }
3649
3650                 r = address_add(link, family, &address, prefixlen, NULL);
3651                 if (r < 0)
3652                         return log_link_error_errno(link, r, "Failed to add address: %m");
3653         }
3654
3655         for (const char *p = routes; p; ) {
3656                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3657                 _cleanup_(route_freep) Route *tmp = NULL;
3658                 _cleanup_free_ char *route_str = NULL;
3659                 char *prefixlen_str;
3660                 Route *route;
3661
3662                 r = extract_first_word(&p, &route_str, NULL, 0);
3663                 if (r < 0)
3664                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3665                 if (r <= 0)
3666                         break;
3667
3668                 prefixlen_str = strchr(route_str, '/');
3669                 if (!prefixlen_str) {
3670                         log_link_debug(link, "Failed to parse route %s", route_str);
3671                         continue;
3672                 }
3673                 *prefixlen_str++ = '\0';
3674
3675                 r = route_new(&tmp);
3676                 if (r < 0)
3677                         return log_oom();
3678
3679                 r = sscanf(prefixlen_str,
3680                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3681                            &tmp->dst_prefixlen,
3682                            &tmp->tos,
3683                            &tmp->priority,
3684                            &tmp->table,
3685                            &tmp->lifetime);
3686                 if (r != 5) {
3687                         log_link_debug(link,
3688                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3689                                        prefixlen_str);
3690                         continue;
3691                 }
3692
3693                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3694                 if (r < 0) {
3695                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3696                         continue;
3697                 }
3698
3699                 r = route_add(link, tmp, &route);
3700                 if (r < 0)
3701                         return log_link_error_errno(link, r, "Failed to add route: %m");
3702
3703                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3704                         r = sd_event_add_time(link->manager->event, &expire,
3705                                               clock_boottime_or_monotonic(),
3706                                               route->lifetime, 0, route_expire_handler, route);
3707                         if (r < 0)
3708                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3709                 }
3710
3711                 sd_event_source_unref(route->expire);
3712                 route->expire = TAKE_PTR(expire);
3713         }
3714
3715         if (dhcp4_address) {
3716                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3717                 if (r < 0) {
3718                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3719                         goto dhcp4_address_fail;
3720                 }
3721
3722                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3723                 if (r < 0)
3724                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3725
3726                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3727                 if (r < 0)
3728                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3729
3730                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3731                 if (r < 0)
3732                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3733         }
3734
3735 dhcp4_address_fail:
3736
3737         if (ipv4ll_address) {
3738                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3739                 if (r < 0) {
3740                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3741                         goto ipv4ll_address_fail;
3742                 }
3743
3744                 r = sd_ipv4ll_new(&link->ipv4ll);
3745                 if (r < 0)
3746                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3747
3748                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3749                 if (r < 0)
3750                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3751
3752                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3753                 if (r < 0)
3754                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3755         }
3756
3757 ipv4ll_address_fail:
3758
3759         return 0;
3760 }
3761
3762 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3763         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3764         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3765         Link *link;
3766         int r;
3767
3768         assert(m);
3769         assert(m->rtnl);
3770         assert(message);
3771         assert(ret);
3772
3773         r = link_new(m, message, ret);
3774         if (r < 0)
3775                 return r;
3776
3777         link = *ret;
3778
3779         log_link_debug(link, "Link %d added", link->ifindex);
3780
3781         r = link_load(link);
3782         if (r < 0)
3783                 return r;
3784
3785         if (path_is_read_only_fs("/sys") <= 0) {
3786                 /* udev should be around */
3787                 sprintf(ifindex_str, "n%d", link->ifindex);
3788                 r = sd_device_new_from_device_id(&device, ifindex_str);
3789                 if (r < 0) {
3790                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3791                         return 0;
3792                 }
3793
3794                 r = sd_device_get_is_initialized(device);
3795                 if (r < 0) {
3796                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3797                         goto failed;
3798                 }
3799                 if (r == 0) {
3800                         /* not yet ready */
3801                         log_link_debug(link, "link pending udev initialization...");
3802                         return 0;
3803                 }
3804
3805                 r = device_is_renaming(device);
3806                 if (r < 0) {
3807                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3808                         goto failed;
3809                 }
3810                 if (r > 0) {
3811                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3812                         return 0;
3813                 }
3814
3815                 r = link_initialized(link, device);
3816                 if (r < 0)
3817                         goto failed;
3818         } else {
3819                 r = link_initialized_and_synced(link);
3820                 if (r < 0)
3821                         goto failed;
3822         }
3823
3824         return 0;
3825 failed:
3826         link_enter_failed(link);
3827         return r;
3828 }
3829
3830 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3831         int r;
3832
3833         assert(link);
3834
3835         log_link_info(link, "Gained IPv6LL");
3836
3837         link->ipv6ll_address = *address;
3838         link_check_ready(link);
3839
3840         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3841                 r = link_acquire_ipv6_conf(link);
3842                 if (r < 0) {
3843                         link_enter_failed(link);
3844                         return r;
3845                 }
3846         }
3847
3848         return 0;
3849 }
3850
3851 static int link_carrier_gained(Link *link) {
3852         int r;
3853
3854         assert(link);
3855
3856         r = wifi_get_info(link);
3857         if (r < 0)
3858                 return r;
3859         if (r > 0) {
3860                 r = link_reconfigure_internal(link, NULL, false);
3861                 if (r < 0) {
3862                         link_enter_failed(link);
3863                         return r;
3864                 }
3865         }
3866
3867         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3868                 r = link_acquire_conf(link);
3869                 if (r < 0) {
3870                         link_enter_failed(link);
3871                         return r;
3872                 }
3873
3874                 link_set_state(link, LINK_STATE_CONFIGURING);
3875                 r = link_request_set_addresses(link);
3876                 if (r < 0)
3877                         return r;
3878         }
3879
3880         r = link_handle_bound_by_list(link);
3881         if (r < 0)
3882                 return r;
3883
3884         return 0;
3885 }
3886
3887 static int link_carrier_lost(Link *link) {
3888         int r;
3889
3890         assert(link);
3891
3892         if (link->network && link->network->ignore_carrier_loss)
3893                 return 0;
3894
3895         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3896          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3897          * configuration and stop the clients as well. */
3898         if (link->setting_mtu)
3899                 return 0;
3900
3901         r = link_stop_clients(link, false);
3902         if (r < 0) {
3903                 link_enter_failed(link);
3904                 return r;
3905         }
3906
3907         if (link_dhcp4_server_enabled(link))
3908                 (void) sd_dhcp_server_stop(link->dhcp_server);
3909
3910         r = link_drop_config(link);
3911         if (r < 0)
3912                 return r;
3913
3914         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3915                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3916                 r = link_drop_foreign_config(link);
3917                 if (r < 0)
3918                         return r;
3919         }
3920
3921         r = link_handle_bound_by_list(link);
3922         if (r < 0)
3923                 return r;
3924
3925         return 0;
3926 }
3927
3928 int link_carrier_reset(Link *link) {
3929         int r;
3930
3931         assert(link);
3932
3933         if (link_has_carrier(link)) {
3934                 r = link_carrier_lost(link);
3935                 if (r < 0)
3936                         return r;
3937
3938                 r = link_carrier_gained(link);
3939                 if (r < 0)
3940                         return r;
3941
3942                 log_link_info(link, "Reset carrier");
3943         }
3944
3945         return 0;
3946 }
3947
3948 /* This is called every time an interface admin state changes to up;
3949  * specifically, when IFF_UP flag changes from unset to set */
3950 static int link_admin_state_up(Link *link) {
3951         int r;
3952
3953         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3954          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3955          * ipv6_mtu_set prevents this from trying to set it too early before
3956          * the link->network has been setup; we only need to reset it
3957          * here if we've already set it during normal initialization. */
3958         if (link->ipv6_mtu_set) {
3959                 r = link_set_ipv6_mtu(link);
3960                 if (r < 0)
3961                         return r;
3962         }
3963
3964         return 0;
3965 }
3966
3967 int link_update(Link *link, sd_netlink_message *m) {
3968         _cleanup_strv_free_ char **s = NULL;
3969         struct ether_addr mac;
3970         const char *ifname;
3971         uint32_t mtu;
3972         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3973         int old_master, r;
3974
3975         assert(link);
3976         assert(link->ifname);
3977         assert(m);
3978
3979         if (link->state == LINK_STATE_LINGER) {
3980                 log_link_info(link, "Link re-added");
3981                 link_set_state(link, LINK_STATE_CONFIGURING);
3982
3983                 r = link_new_carrier_maps(link);
3984                 if (r < 0)
3985                         return r;
3986         }
3987
3988         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3989         if (r >= 0 && !streq(ifname, link->ifname)) {
3990                 Manager *manager = link->manager;
3991
3992                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3993
3994                 link_drop(link);
3995                 r = link_add(manager, m, &link);
3996                 if (r < 0)
3997                         return r;
3998         }
3999
4000         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
4001         if (r >= 0)
4002                 strv_free_and_replace(link->alternative_names, s);
4003
4004         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
4005         if (r >= 0 && mtu > 0) {
4006                 link->mtu = mtu;
4007                 if (link->original_mtu == 0) {
4008                         link->original_mtu = mtu;
4009                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
4010                 }
4011
4012                 if (link->dhcp_client) {
4013                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
4014                                                    link->mtu);
4015                         if (r < 0)
4016                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
4017                 }
4018
4019                 if (link->radv) {
4020                         r = sd_radv_set_mtu(link->radv, link->mtu);
4021                         if (r < 0)
4022                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
4023                 }
4024         }
4025
4026         /* The kernel may broadcast NEWLINK messages without the MAC address
4027            set, simply ignore them. */
4028         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
4029         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
4030
4031                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
4032
4033                 log_link_debug(link, "Gained new MAC address: "
4034                                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
4035                                mac.ether_addr_octet[0],
4036                                mac.ether_addr_octet[1],
4037                                mac.ether_addr_octet[2],
4038                                mac.ether_addr_octet[3],
4039                                mac.ether_addr_octet[4],
4040                                mac.ether_addr_octet[5]);
4041
4042                 if (link->ipv4ll) {
4043                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
4044
4045                         if (restart) {
4046                                 r = sd_ipv4ll_stop(link->ipv4ll);
4047                                 if (r < 0)
4048                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
4049                         }
4050
4051                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
4052                         if (r < 0)
4053                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
4054
4055                         if (restart) {
4056                                 r = sd_ipv4ll_start(link->ipv4ll);
4057                                 if (r < 0)
4058                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
4059                         }
4060                 }
4061
4062                 if (link->dhcp_client) {
4063                         r = sd_dhcp_client_set_mac(link->dhcp_client,
4064                                                    (const uint8_t *) &link->mac,
4065                                                    sizeof (link->mac),
4066                                                    ARPHRD_ETHER);
4067                         if (r < 0)
4068                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
4069
4070                         r = dhcp4_set_client_identifier(link);
4071                         if (r < 0)
4072                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
4073                 }
4074
4075                 if (link->dhcp6_client) {
4076                         const DUID* duid = link_get_duid(link);
4077                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
4078
4079                         if (restart) {
4080                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
4081                                 if (r < 0)
4082                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
4083                         }
4084
4085                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
4086                                                     (const uint8_t *) &link->mac,
4087                                                     sizeof (link->mac),
4088                                                     ARPHRD_ETHER);
4089                         if (r < 0)
4090                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4091
4092                         if (link->network->iaid_set) {
4093                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4094                                 if (r < 0)
4095                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4096                         }
4097
4098                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4099                                                      duid->type,
4100                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4101                                                      duid->raw_data_len);
4102                         if (r < 0)
4103                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4104
4105                         if (restart) {
4106                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4107                                 if (r < 0)
4108                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4109                         }
4110                 }
4111
4112                 if (link->radv) {
4113                         bool restart = sd_radv_is_running(link->radv);
4114
4115                         if (restart) {
4116                                 r = sd_radv_stop(link->radv);
4117                                 if (r < 0)
4118                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4119                         }
4120
4121                         r = sd_radv_set_mac(link->radv, &link->mac);
4122                         if (r < 0)
4123                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4124
4125                         if (restart) {
4126                                 r = sd_radv_start(link->radv);
4127                                 if (r < 0)
4128                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4129                         }
4130                 }
4131
4132                 if (link->ndisc) {
4133                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4134                         if (r < 0)
4135                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4136                 }
4137         }
4138
4139         old_master = link->master_ifindex;
4140         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4141
4142         link_was_admin_up = link->flags & IFF_UP;
4143         had_carrier = link_has_carrier(link);
4144
4145         r = link_update_flags(link, m, old_master != link->master_ifindex);
4146         if (r < 0)
4147                 return r;
4148
4149         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4150                 log_link_info(link, "Link UP");
4151
4152                 r = link_admin_state_up(link);
4153                 if (r < 0)
4154                         return r;
4155         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4156                 log_link_info(link, "Link DOWN");
4157
4158         r = link_update_lldp(link);
4159         if (r < 0)
4160                 return r;
4161
4162         carrier_gained = !had_carrier && link_has_carrier(link);
4163         carrier_lost = had_carrier && !link_has_carrier(link);
4164
4165         if (carrier_gained) {
4166                 log_link_info(link, "Gained carrier");
4167
4168                 r = link_carrier_gained(link);
4169                 if (r < 0)
4170                         return r;
4171         } else if (carrier_lost) {
4172                 log_link_info(link, "Lost carrier");
4173
4174                 r = link_carrier_lost(link);
4175                 if (r < 0)
4176                         return r;
4177         }
4178
4179         return 0;
4180 }
4181
4182 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4183         bool space = false;
4184         Iterator i;
4185         Link *link;
4186
4187         assert(f);
4188         assert(prefix);
4189
4190         if (hashmap_isempty(h))
4191                 return;
4192
4193         fputs(prefix, f);
4194         HASHMAP_FOREACH(link, h, i) {
4195                 if (space)
4196                         fputc(' ', f);
4197
4198                 fprintf(f, "%i", link->ifindex);
4199                 space = true;
4200         }
4201
4202         fputc('\n', f);
4203 }
4204
4205 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4206         for (unsigned j = 0; j < n_dns; j++) {
4207                 const char *str;
4208
4209                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4210                         continue;
4211
4212                 str = in_addr_full_to_string(dns[j]);
4213                 if (!str)
4214                         continue;
4215
4216                 if (*space)
4217                         fputc(' ', f);
4218                 fputs(str, f);
4219                 *space = true;
4220         }
4221 }
4222
4223 static void serialize_addresses(
4224                 FILE *f,
4225                 const char *lvalue,
4226                 bool *space,
4227                 char **addresses,
4228                 sd_dhcp_lease *lease,
4229                 bool conditional,
4230                 sd_dhcp_lease_server_type what,
4231                 sd_dhcp6_lease *lease6,
4232                 bool conditional6,
4233                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4234                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4235         int r;
4236
4237         bool _space = false;
4238         if (!space)
4239                 space = &_space;
4240
4241         if (lvalue)
4242                 fprintf(f, "%s=", lvalue);
4243         fputstrv(f, addresses, NULL, space);
4244
4245         if (lease && conditional) {
4246                 const struct in_addr *lease_addresses;
4247
4248                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4249                 if (r > 0)
4250                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4251         }
4252
4253         if (lease6 && conditional6 && lease6_get_addr) {
4254                 const struct in6_addr *in6_addrs;
4255
4256                 r = lease6_get_addr(lease6, &in6_addrs);
4257                 if (r > 0)
4258                         serialize_in6_addrs(f, in6_addrs, r, space);
4259         }
4260
4261         if (lease6 && conditional6 && lease6_get_fqdn) {
4262                 char **in6_hosts;
4263
4264                 r = lease6_get_fqdn(lease6, &in6_hosts);
4265                 if (r > 0)
4266                         fputstrv(f, in6_hosts, NULL, space);
4267         }
4268
4269         if (lvalue)
4270                 fputc('\n', f);
4271 }
4272
4273 int link_save(Link *link) {
4274         const char *admin_state, *oper_state, *carrier_state, *address_state;
4275         _cleanup_free_ char *temp_path = NULL;
4276         _cleanup_fclose_ FILE *f = NULL;
4277         Route *route;
4278         Address *a;
4279         Iterator i;
4280         int r;
4281
4282         assert(link);
4283         assert(link->state_file);
4284         assert(link->lease_file);
4285         assert(link->manager);
4286
4287         if (link->state == LINK_STATE_LINGER) {
4288                 (void) unlink(link->state_file);
4289                 return 0;
4290         }
4291
4292         link_lldp_save(link);
4293
4294         admin_state = link_state_to_string(link->state);
4295         assert(admin_state);
4296
4297         oper_state = link_operstate_to_string(link->operstate);
4298         assert(oper_state);
4299
4300         carrier_state = link_carrier_state_to_string(link->carrier_state);
4301         assert(carrier_state);
4302
4303         address_state = link_address_state_to_string(link->address_state);
4304         assert(address_state);
4305
4306         r = fopen_temporary(link->state_file, &f, &temp_path);
4307         if (r < 0)
4308                 goto fail;
4309
4310         (void) fchmod(fileno(f), 0644);
4311
4312         fprintf(f,
4313                 "# This is private data. Do not parse.\n"
4314                 "ADMIN_STATE=%s\n"
4315                 "OPER_STATE=%s\n"
4316                 "CARRIER_STATE=%s\n"
4317                 "ADDRESS_STATE=%s\n",
4318                 admin_state, oper_state, carrier_state, address_state);
4319
4320         if (link->network) {
4321                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4322                 const char *dhcp_domainname = NULL, *p;
4323                 bool space;
4324
4325                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4326                         yes_no(link->network->required_for_online));
4327
4328                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4329                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4330                         strempty(link_operstate_to_string(st.min)),
4331                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4332                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4333
4334                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4335
4336                 /************************************************************/
4337
4338                 fputs("DNS=", f);
4339                 space = false;
4340                 if (link->n_dns != (unsigned) -1)
4341                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4342                 else
4343                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4344
4345                 serialize_addresses(f, NULL, &space,
4346                                     NULL,
4347                                     link->dhcp_lease,
4348                                     link->network->dhcp_use_dns,
4349                                     SD_DHCP_LEASE_DNS,
4350                                     link->dhcp6_lease,
4351                                     link->network->dhcp6_use_dns,
4352                                     sd_dhcp6_lease_get_dns,
4353                                     NULL);
4354
4355                 /* Make sure to flush out old entries before we use the NDisc data */
4356                 ndisc_vacuum(link);
4357
4358                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4359                         NDiscRDNSS *dd;
4360
4361                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4362                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4363                 }
4364
4365                 fputc('\n', f);
4366
4367                 /************************************************************/
4368
4369                 serialize_addresses(f, "NTP", NULL,
4370                                     link->ntp ?: link->network->ntp,
4371                                     link->dhcp_lease,
4372                                     link->network->dhcp_use_ntp,
4373                                     SD_DHCP_LEASE_NTP,
4374                                     link->dhcp6_lease,
4375                                     link->network->dhcp6_use_ntp,
4376                                     sd_dhcp6_lease_get_ntp_addrs,
4377                                     sd_dhcp6_lease_get_ntp_fqdn);
4378
4379                 serialize_addresses(f, "SIP", NULL,
4380                                     NULL,
4381                                     link->dhcp_lease,
4382                                     link->network->dhcp_use_sip,
4383                                     SD_DHCP_LEASE_SIP,
4384                                     NULL, false, NULL, NULL);
4385
4386                 /************************************************************/
4387
4388                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4389                         if (link->dhcp_lease) {
4390                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4391                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4392                         }
4393                         if (link->dhcp6_lease)
4394                                 (void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains);
4395                 }
4396
4397                 fputs("DOMAINS=", f);
4398                 space = false;
4399                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4400                         fputs_with_space(f, p, NULL, &space);
4401
4402                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4403                         if (dhcp_domainname)
4404                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4405                         if (dhcp_domains)
4406                                 fputstrv(f, dhcp_domains, NULL, &space);
4407                         if (dhcp6_domains)
4408                                 fputstrv(f, dhcp6_domains, NULL, &space);
4409                 }
4410
4411                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4412                         NDiscDNSSL *dd;
4413
4414                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4415                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4416                 }
4417
4418                 fputc('\n', f);
4419
4420                 /************************************************************/
4421
4422                 fputs("ROUTE_DOMAINS=", f);
4423                 space = false;
4424                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4425                         fputs_with_space(f, p, NULL, &space);
4426
4427                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4428                         if (dhcp_domainname)
4429                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4430                         if (dhcp_domains)
4431                                 fputstrv(f, dhcp_domains, NULL, &space);
4432                         if (dhcp6_domains)
4433                                 fputstrv(f, dhcp6_domains, NULL, &space);
4434                 }
4435
4436                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4437                         NDiscDNSSL *dd;
4438
4439                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4440                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4441                 }
4442
4443                 fputc('\n', f);
4444
4445                 /************************************************************/
4446
4447                 fprintf(f, "LLMNR=%s\n",
4448                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4449
4450                 /************************************************************/
4451
4452                 fprintf(f, "MDNS=%s\n",
4453                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4454
4455                 /************************************************************/
4456
4457                 int dns_default_route =
4458                         link->dns_default_route >= 0 ? link->dns_default_route :
4459                         link->network->dns_default_route;
4460                 if (dns_default_route >= 0)
4461                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4462
4463                 /************************************************************/
4464
4465                 DnsOverTlsMode dns_over_tls_mode =
4466                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4467                         link->network->dns_over_tls_mode;
4468                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4469                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4470
4471                 /************************************************************/
4472
4473                 DnssecMode dnssec_mode =
4474                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4475                         link->network->dnssec_mode;
4476                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4477                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4478
4479                 /************************************************************/
4480
4481                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4482                 if (set_isempty(nta_anchors))
4483                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4484
4485                 if (!set_isempty(nta_anchors)) {
4486                         const char *n;
4487
4488                         fputs("DNSSEC_NTA=", f);
4489                         space = false;
4490                         SET_FOREACH(n, nta_anchors, i)
4491                                 fputs_with_space(f, n, NULL, &space);
4492                         fputc('\n', f);
4493                 }
4494
4495                 /************************************************************/
4496
4497                 fputs("ADDRESSES=", f);
4498                 space = false;
4499                 SET_FOREACH(a, link->addresses, i) {
4500                         _cleanup_free_ char *address_str = NULL;
4501
4502                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4503                         if (r < 0)
4504                                 goto fail;
4505
4506                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4507                         space = true;
4508                 }
4509                 fputc('\n', f);
4510
4511                 /************************************************************/
4512
4513                 fputs("ROUTES=", f);
4514                 space = false;
4515                 SET_FOREACH(route, link->routes, i) {
4516                         _cleanup_free_ char *route_str = NULL;
4517
4518                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4519                         if (r < 0)
4520                                 goto fail;
4521
4522                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4523                                 space ? " " : "", route_str,
4524                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4525                         space = true;
4526                 }
4527
4528                 fputc('\n', f);
4529         }
4530
4531         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4532         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4533
4534         if (link->dhcp_lease) {
4535                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4536                 if (r < 0)
4537                         goto fail;
4538
4539                 fprintf(f,
4540                         "DHCP_LEASE=%s\n",
4541                         link->lease_file);
4542         } else
4543                 (void) unlink(link->lease_file);
4544
4545         if (link->ipv4ll) {
4546                 struct in_addr address;
4547
4548                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4549                 if (r >= 0) {
4550                         fputs("IPV4LL_ADDRESS=", f);
4551                         serialize_in_addrs(f, &address, 1, false, NULL);
4552                         fputc('\n', f);
4553                 }
4554         }
4555
4556         if (link->dhcp6_client) {
4557                 _cleanup_free_ char *duid = NULL;
4558                 uint32_t iaid;
4559
4560                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4561                 if (r >= 0)
4562                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4563
4564                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4565                 if (r >= 0)
4566                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4567         }
4568
4569         r = fflush_and_check(f);
4570         if (r < 0)
4571                 goto fail;
4572
4573         if (rename(temp_path, link->state_file) < 0) {
4574                 r = -errno;
4575                 goto fail;
4576         }
4577
4578         return 0;
4579
4580 fail:
4581         (void) unlink(link->state_file);
4582         if (temp_path)
4583                 (void) unlink(temp_path);
4584
4585         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4586 }
4587
4588 /* The serialized state in /run is no longer up-to-date. */
4589 void link_dirty(Link *link) {
4590         int r;
4591
4592         assert(link);
4593
4594         /* mark manager dirty as link is dirty */
4595         manager_dirty(link->manager);
4596
4597         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4598         if (r <= 0)
4599                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4600                 return;
4601         link_ref(link);
4602 }
4603
4604 /* The serialized state in /run is up-to-date */
4605 void link_clean(Link *link) {
4606         assert(link);
4607         assert(link->manager);
4608
4609         link_unref(set_remove(link->manager->dirty_links, link));
4610 }
4611
4612 int link_save_and_clean(Link *link) {
4613         int r;
4614
4615         r = link_save(link);
4616         if (r < 0)
4617                 return r;
4618
4619         link_clean(link);
4620         return 0;
4621 }
4622
4623 static const char* const link_state_table[_LINK_STATE_MAX] = {
4624         [LINK_STATE_PENDING] = "pending",
4625         [LINK_STATE_INITIALIZED] = "initialized",
4626         [LINK_STATE_CONFIGURING] = "configuring",
4627         [LINK_STATE_CONFIGURED] = "configured",
4628         [LINK_STATE_UNMANAGED] = "unmanaged",
4629         [LINK_STATE_FAILED] = "failed",
4630         [LINK_STATE_LINGER] = "linger",
4631 };
4632
4633 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4634
4635 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4636         const char *err_msg = NULL;
4637
4638         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4639         return log_link_full(link, level, err,
4640                              "%s: %s%s%s%m",
4641                              msg,
4642                              strempty(err_msg),
4643                              err_msg && !endswith(err_msg, ".") ? "." : "",
4644                              err_msg ? " " : "");
4645 }