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         if (link->address_remove_messages != 0) {
1369                 log_link_debug(link, "Removing old addresses, new addresses will be configured later.");
1370                 link->request_static_addresses = true;
1371                 return 0;
1372         }
1373
1374         /* Reset all *_configured flags we are configuring. */
1375         link->request_static_addresses = false;
1376         link->addresses_configured = false;
1377         link->addresses_ready = false;
1378         link->neighbors_configured = false;
1379         link->static_routes_configured = false;
1380         link->static_nexthops_configured = false;
1381         link->routing_policy_rules_configured = false;
1382
1383         r = link_set_bridge_fdb(link);
1384         if (r < 0)
1385                 return r;
1386
1387         r = link_request_set_neighbors(link);
1388         if (r < 0)
1389                 return r;
1390
1391         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1392                 bool update;
1393
1394                 if (ad->family == AF_INET6 && !in_addr_is_null(ad->family, &ad->in_addr_peer))
1395                         update = address_get(link, ad->family, &ad->in_addr_peer, ad->prefixlen, NULL) > 0;
1396                 else
1397                         update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1398
1399                 r = static_address_configure(ad, link, update);
1400                 if (r < 0)
1401                         return r;
1402         }
1403
1404         if (link->network->router_prefix_delegation & RADV_PREFIX_DELEGATION_STATIC)
1405                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1406                         _cleanup_(address_freep) Address *address = NULL;
1407
1408                         if (!p->assign)
1409                                 continue;
1410
1411                         r = address_new(&address);
1412                         if (r < 0)
1413                                 return log_oom();
1414
1415                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1416                         if (r < 0)
1417                                 return log_link_warning_errno(link, r, "Could not get RA prefix: %m");
1418
1419                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1420                         if (r < 0)
1421                                 return log_link_warning_errno(link, r, "Could not generate EUI64 address: %m");
1422
1423                         address->family = AF_INET6;
1424                         r = static_address_configure(address, link, true);
1425                         if (r < 0)
1426                                 return r;
1427                 }
1428
1429         LIST_FOREACH(labels, label, link->network->address_labels) {
1430                 r = address_label_configure(label, link, NULL, false);
1431                 if (r < 0)
1432                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1433
1434                 link->address_label_messages++;
1435         }
1436
1437         /* now that we can figure out a default address for the dhcp server, start it */
1438         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1439                 r = dhcp4_server_configure(link);
1440                 if (r < 0)
1441                         return r;
1442                 log_link_debug(link, "Offering DHCPv4 leases");
1443         }
1444
1445         if (link->address_messages == 0) {
1446                 link->addresses_configured = true;
1447                 link->addresses_ready = true;
1448                 r = link_request_set_routes(link);
1449                 if (r < 0)
1450                         return r;
1451         } else {
1452                 log_link_debug(link, "Setting addresses");
1453                 link_set_state(link, LINK_STATE_CONFIGURING);
1454         }
1455
1456         return 0;
1457 }
1458
1459 static int link_set_bridge_vlan(Link *link) {
1460         int r;
1461
1462         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1463         if (r < 0)
1464                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1465
1466         return r;
1467 }
1468
1469 static int link_set_proxy_arp(Link *link) {
1470         int r;
1471
1472         if (!link_proxy_arp_enabled(link))
1473                 return 0;
1474
1475         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1476         if (r < 0)
1477                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1478
1479         return 0;
1480 }
1481
1482 static int link_configure_continue(Link *link);
1483
1484 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1485         int r;
1486
1487         assert(m);
1488         assert(link);
1489         assert(link->ifname);
1490
1491         link->setting_mtu = false;
1492
1493         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1494                 return 1;
1495
1496         r = sd_netlink_message_get_errno(m);
1497         if (r < 0)
1498                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1499         else
1500                 log_link_debug(link, "Setting MTU done.");
1501
1502         if (link->state == LINK_STATE_INITIALIZED) {
1503                 r = link_configure_continue(link);
1504                 if (r < 0)
1505                         link_enter_failed(link);
1506         }
1507
1508         return 1;
1509 }
1510
1511 int link_set_mtu(Link *link, uint32_t mtu) {
1512         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1513         int r;
1514
1515         assert(link);
1516         assert(link->manager);
1517         assert(link->manager->rtnl);
1518
1519         if (mtu == 0 || link->setting_mtu)
1520                 return 0;
1521
1522         if (link->mtu == mtu)
1523                 return 0;
1524
1525         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1526
1527         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1528         if (r < 0)
1529                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1530
1531         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1532          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1533         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1534
1535                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1536                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1537
1538                 mtu = IPV6_MIN_MTU;
1539         }
1540
1541         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1542         if (r < 0)
1543                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1544
1545         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1546                                link_netlink_destroy_callback, link);
1547         if (r < 0)
1548                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1549
1550         link_ref(link);
1551         link->setting_mtu = true;
1552
1553         return 0;
1554 }
1555
1556 static bool link_reduces_vlan_mtu(Link *link) {
1557         /* See netif_reduces_vlan_mtu() in kernel. */
1558         return streq_ptr(link->kind, "macsec");
1559 }
1560
1561 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1562         uint32_t mtu = 0;
1563         NetDev *dev;
1564         Iterator i;
1565
1566         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1567                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1568                         /* See vlan_dev_change_mtu() in kernel. */
1569                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1570
1571                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1572                         /* See macvlan_change_mtu() in kernel. */
1573                         mtu = dev->mtu;
1574
1575         return mtu;
1576 }
1577
1578 static int link_configure_mtu(Link *link) {
1579         uint32_t mtu;
1580
1581         assert(link);
1582         assert(link->network);
1583
1584         if (link->network->mtu > 0)
1585                 return link_set_mtu(link, link->network->mtu);
1586
1587         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1588         if (link->mtu >= mtu)
1589                 return 0;
1590
1591         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1592                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1593                         link->mtu, mtu);
1594
1595         return link_set_mtu(link, mtu);
1596 }
1597
1598 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1599         int r;
1600
1601         assert(m);
1602         assert(link);
1603         assert(link->ifname);
1604
1605         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1606                 return 1;
1607
1608         r = sd_netlink_message_get_errno(m);
1609         if (r < 0)
1610                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1611
1612         return 1;
1613 }
1614
1615 static int link_set_flags(Link *link) {
1616         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1617         unsigned ifi_change = 0;
1618         unsigned ifi_flags = 0;
1619         int r;
1620
1621         assert(link);
1622         assert(link->manager);
1623         assert(link->manager->rtnl);
1624
1625         if (link->flags & IFF_LOOPBACK)
1626                 return 0;
1627
1628         if (!link->network)
1629                 return 0;
1630
1631         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1632                 return 0;
1633
1634         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1635         if (r < 0)
1636                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1637
1638         if (link->network->arp >= 0) {
1639                 ifi_change |= IFF_NOARP;
1640                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1641         }
1642
1643         if (link->network->multicast >= 0) {
1644                 ifi_change |= IFF_MULTICAST;
1645                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1646         }
1647
1648         if (link->network->allmulticast >= 0) {
1649                 ifi_change |= IFF_ALLMULTI;
1650                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1651         }
1652
1653         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1654         if (r < 0)
1655                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1656
1657         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1658                                link_netlink_destroy_callback, link);
1659         if (r < 0)
1660                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1661
1662         link_ref(link);
1663
1664         return 0;
1665 }
1666
1667 static int link_acquire_ipv6_conf(Link *link) {
1668         int r;
1669
1670         assert(link);
1671
1672         if (link_ipv6_accept_ra_enabled(link)) {
1673                 assert(link->ndisc);
1674
1675                 log_link_debug(link, "Discovering IPv6 routers");
1676
1677                 r = sd_ndisc_start(link->ndisc);
1678                 if (r < 0 && r != -EBUSY)
1679                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1680         }
1681
1682         if (link_radv_enabled(link)) {
1683                 assert(link->radv);
1684                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1685
1686                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1687
1688                 r = radv_emit_dns(link);
1689                 if (r < 0)
1690                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1691
1692                 r = sd_radv_start(link->radv);
1693                 if (r < 0 && r != -EBUSY)
1694                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1695         }
1696
1697         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1698                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1699                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1700                 assert(link->dhcp6_client);
1701                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1702
1703                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1704                 if (r < 0 && r != -EBUSY)
1705                         return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1706                 else
1707                         log_link_debug(link, "Acquiring DHCPv6 lease");
1708         }
1709
1710         r = dhcp6_request_prefix_delegation(link);
1711         if (r < 0)
1712                 return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m");
1713
1714         return 0;
1715 }
1716
1717 static int link_acquire_ipv4_conf(Link *link) {
1718         int r;
1719
1720         assert(link);
1721         assert(link->manager);
1722         assert(link->manager->event);
1723
1724         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1725                 assert(link->ipv4ll);
1726
1727                 log_link_debug(link, "Acquiring IPv4 link-local address");
1728
1729                 r = sd_ipv4ll_start(link->ipv4ll);
1730                 if (r < 0)
1731                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1732         }
1733
1734         if (link_dhcp4_enabled(link)) {
1735                 assert(link->dhcp_client);
1736
1737                 log_link_debug(link, "Acquiring DHCPv4 lease");
1738
1739                 r = sd_dhcp_client_start(link->dhcp_client);
1740                 if (r < 0)
1741                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1742         }
1743
1744         return 0;
1745 }
1746
1747 static int link_acquire_conf(Link *link) {
1748         int r;
1749
1750         assert(link);
1751
1752         r = link_acquire_ipv4_conf(link);
1753         if (r < 0)
1754                 return r;
1755
1756         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1757                 r = link_acquire_ipv6_conf(link);
1758                 if (r < 0)
1759                         return r;
1760         }
1761
1762         if (link_lldp_emit_enabled(link)) {
1763                 r = link_lldp_emit_start(link);
1764                 if (r < 0)
1765                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1766         }
1767
1768         return 0;
1769 }
1770
1771 bool link_has_carrier(Link *link) {
1772         /* see Documentation/networking/operstates.txt in the kernel sources */
1773
1774         if (link->kernel_operstate == IF_OPER_UP)
1775                 return true;
1776
1777         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1778                 /* operstate may not be implemented, so fall back to flags */
1779                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1780                     !FLAGS_SET(link->flags, IFF_DORMANT))
1781                         return true;
1782
1783         return false;
1784 }
1785
1786 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1787         int r;
1788
1789         assert(link);
1790
1791         link->setting_genmode = false;
1792
1793         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1794                 return 1;
1795
1796         r = sd_netlink_message_get_errno(m);
1797         if (r < 0)
1798                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1799         else
1800                 log_link_debug(link, "Setting address genmode done.");
1801
1802         if (link->state == LINK_STATE_INITIALIZED) {
1803                 r = link_configure_continue(link);
1804                 if (r < 0)
1805                         link_enter_failed(link);
1806         }
1807
1808         return 1;
1809 }
1810
1811 static int link_configure_addrgen_mode(Link *link) {
1812         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1813         uint8_t ipv6ll_mode;
1814         int r;
1815
1816         assert(link);
1817         assert(link->network);
1818         assert(link->manager);
1819         assert(link->manager->rtnl);
1820
1821         if (!socket_ipv6_is_supported() || link->setting_genmode)
1822                 return 0;
1823
1824         log_link_debug(link, "Setting address genmode for link");
1825
1826         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1827         if (r < 0)
1828                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1829
1830         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1831         if (r < 0)
1832                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1833
1834         r = sd_netlink_message_open_container(req, AF_INET6);
1835         if (r < 0)
1836                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1837
1838         if (!link_ipv6ll_enabled(link))
1839                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1840         else if (link->network->ipv6ll_address_gen_mode < 0) {
1841                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1842                 if (r < 0) {
1843                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1844                          * reading the file fails with EIO. */
1845                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1846
1847                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1848                 } else
1849                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1850         } else
1851                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1852
1853         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1854         if (r < 0)
1855                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1856
1857         r = sd_netlink_message_close_container(req);
1858         if (r < 0)
1859                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1860
1861         r = sd_netlink_message_close_container(req);
1862         if (r < 0)
1863                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1864
1865         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1866                                link_netlink_destroy_callback, link);
1867         if (r < 0)
1868                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1869
1870         link_ref(link);
1871         link->setting_genmode = true;
1872
1873         return 0;
1874 }
1875
1876 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1877         int r;
1878
1879         assert(link);
1880
1881         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1882                 return 1;
1883
1884         r = sd_netlink_message_get_errno(m);
1885         if (r < 0)
1886                 /* we warn but don't fail the link, as it may be brought up later */
1887                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1888
1889         return 1;
1890 }
1891
1892 static int link_up(Link *link) {
1893         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1894         int r;
1895
1896         assert(link);
1897         assert(link->network);
1898         assert(link->manager);
1899         assert(link->manager->rtnl);
1900
1901         log_link_debug(link, "Bringing link up");
1902
1903         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1904         if (r < 0)
1905                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1906
1907         /* set it free if not enslaved with networkd */
1908         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1909                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1910                 if (r < 0)
1911                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1912         }
1913
1914         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1915         if (r < 0)
1916                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1917
1918         if (link->network->mac) {
1919                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1920                 if (r < 0)
1921                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1922         }
1923
1924         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1925                                link_netlink_destroy_callback, link);
1926         if (r < 0)
1927                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1928
1929         link_ref(link);
1930
1931         return 0;
1932 }
1933
1934 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1935         int r;
1936
1937         assert(link);
1938
1939         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1940                 return 1;
1941
1942         r = sd_netlink_message_get_errno(m);
1943         if (r < 0)
1944                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1945
1946         return 1;
1947 }
1948
1949 int link_down(Link *link, link_netlink_message_handler_t callback) {
1950         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1951         int r;
1952
1953         assert(link);
1954         assert(link->manager);
1955         assert(link->manager->rtnl);
1956
1957         log_link_debug(link, "Bringing link down");
1958
1959         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1960                                      RTM_SETLINK, link->ifindex);
1961         if (r < 0)
1962                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1963
1964         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1965         if (r < 0)
1966                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1967
1968         r = netlink_call_async(link->manager->rtnl, NULL, req,
1969                                callback ?: link_down_handler,
1970                                link_netlink_destroy_callback, link);
1971         if (r < 0)
1972                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1973
1974         link_ref(link);
1975
1976         return 0;
1977 }
1978
1979 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1980         int r;
1981
1982         assert(link);
1983
1984         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1985                 return 1;
1986
1987         r = sd_netlink_message_get_errno(m);
1988         if (r < 0)
1989                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1990
1991         return 1;
1992 }
1993
1994 static int link_set_group(Link *link) {
1995         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1996         int r;
1997
1998         assert(link);
1999         assert(link->network);
2000         assert(link->manager);
2001         assert(link->manager->rtnl);
2002
2003         if (link->network->group <= 0)
2004                 return 0;
2005
2006         log_link_debug(link, "Setting group");
2007
2008         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2009         if (r < 0)
2010                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2011
2012         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
2013         if (r < 0)
2014                 return log_link_error_errno(link, r, "Could not set link group: %m");
2015
2016         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
2017                                link_netlink_destroy_callback, link);
2018         if (r < 0)
2019                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2020
2021         link_ref(link);
2022
2023         return 0;
2024 }
2025
2026 static int link_handle_bound_to_list(Link *link) {
2027         Link *l;
2028         Iterator i;
2029         int r;
2030         bool required_up = false;
2031         bool link_is_up = false;
2032
2033         assert(link);
2034
2035         if (hashmap_isempty(link->bound_to_links))
2036                 return 0;
2037
2038         if (link->flags & IFF_UP)
2039                 link_is_up = true;
2040
2041         HASHMAP_FOREACH (l, link->bound_to_links, i)
2042                 if (link_has_carrier(l)) {
2043                         required_up = true;
2044                         break;
2045                 }
2046
2047         if (!required_up && link_is_up) {
2048                 r = link_down(link, NULL);
2049                 if (r < 0)
2050                         return r;
2051         } else if (required_up && !link_is_up) {
2052                 r = link_up(link);
2053                 if (r < 0)
2054                         return r;
2055         }
2056
2057         return 0;
2058 }
2059
2060 static int link_handle_bound_by_list(Link *link) {
2061         Iterator i;
2062         Link *l;
2063         int r;
2064
2065         assert(link);
2066
2067         if (hashmap_isempty(link->bound_by_links))
2068                 return 0;
2069
2070         HASHMAP_FOREACH (l, link->bound_by_links, i) {
2071                 r = link_handle_bound_to_list(l);
2072                 if (r < 0)
2073                         return r;
2074         }
2075
2076         return 0;
2077 }
2078
2079 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2080         int r;
2081
2082         assert(link);
2083         assert(carrier);
2084
2085         if (link == carrier)
2086                 return 0;
2087
2088         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2089                 return 0;
2090
2091         r = hashmap_ensure_allocated(h, NULL);
2092         if (r < 0)
2093                 return r;
2094
2095         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2096         if (r < 0)
2097                 return r;
2098
2099         return 0;
2100 }
2101
2102 static int link_new_bound_by_list(Link *link) {
2103         Manager *m;
2104         Link *carrier;
2105         Iterator i;
2106         int r;
2107         bool list_updated = false;
2108
2109         assert(link);
2110         assert(link->manager);
2111
2112         m = link->manager;
2113
2114         HASHMAP_FOREACH(carrier, m->links, i) {
2115                 if (!carrier->network)
2116                         continue;
2117
2118                 if (strv_isempty(carrier->network->bind_carrier))
2119                         continue;
2120
2121                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2122                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2123                         if (r < 0)
2124                                 return r;
2125
2126                         list_updated = true;
2127                 }
2128         }
2129
2130         if (list_updated)
2131                 link_dirty(link);
2132
2133         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
2134                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2135                 if (r < 0)
2136                         return r;
2137
2138                 link_dirty(carrier);
2139         }
2140
2141         return 0;
2142 }
2143
2144 static int link_new_bound_to_list(Link *link) {
2145         Manager *m;
2146         Link *carrier;
2147         Iterator i;
2148         int r;
2149         bool list_updated = false;
2150
2151         assert(link);
2152         assert(link->manager);
2153
2154         if (!link->network)
2155                 return 0;
2156
2157         if (strv_isempty(link->network->bind_carrier))
2158                 return 0;
2159
2160         m = link->manager;
2161
2162         HASHMAP_FOREACH (carrier, m->links, i) {
2163                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2164                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2165                         if (r < 0)
2166                                 return r;
2167
2168                         list_updated = true;
2169                 }
2170         }
2171
2172         if (list_updated)
2173                 link_dirty(link);
2174
2175         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2176                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2177                 if (r < 0)
2178                         return r;
2179
2180                 link_dirty(carrier);
2181         }
2182
2183         return 0;
2184 }
2185
2186 static int link_new_carrier_maps(Link *link) {
2187         int r;
2188
2189         r = link_new_bound_by_list(link);
2190         if (r < 0)
2191                 return r;
2192
2193         r = link_handle_bound_by_list(link);
2194         if (r < 0)
2195                 return r;
2196
2197         r = link_new_bound_to_list(link);
2198         if (r < 0)
2199                 return r;
2200
2201         r = link_handle_bound_to_list(link);
2202         if (r < 0)
2203                 return r;
2204
2205         return 0;
2206 }
2207
2208 static void link_free_bound_to_list(Link *link) {
2209         Link *bound_to;
2210         Iterator i;
2211
2212         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2213                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2214
2215                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2216                         link_dirty(bound_to);
2217         }
2218
2219         return;
2220 }
2221
2222 static void link_free_bound_by_list(Link *link) {
2223         Link *bound_by;
2224         Iterator i;
2225
2226         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2227                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2228
2229                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2230                         link_dirty(bound_by);
2231                         link_handle_bound_to_list(bound_by);
2232                 }
2233         }
2234
2235         return;
2236 }
2237
2238 static void link_free_carrier_maps(Link *link) {
2239         bool list_updated = false;
2240
2241         assert(link);
2242
2243         if (!hashmap_isempty(link->bound_to_links)) {
2244                 link_free_bound_to_list(link);
2245                 list_updated = true;
2246         }
2247
2248         if (!hashmap_isempty(link->bound_by_links)) {
2249                 link_free_bound_by_list(link);
2250                 list_updated = true;
2251         }
2252
2253         if (list_updated)
2254                 link_dirty(link);
2255
2256         return;
2257 }
2258
2259 static int link_append_to_master(Link *link, NetDev *netdev) {
2260         Link *master;
2261         int r;
2262
2263         assert(link);
2264         assert(netdev);
2265
2266         r = link_get(link->manager, netdev->ifindex, &master);
2267         if (r < 0)
2268                 return r;
2269
2270         r = set_ensure_put(&master->slaves, NULL, link);
2271         if (r <= 0)
2272                 return r;
2273
2274         link_ref(link);
2275         return 0;
2276 }
2277
2278 static void link_drop_from_master(Link *link, NetDev *netdev) {
2279         Link *master;
2280
2281         assert(link);
2282
2283         if (!link->manager || !netdev)
2284                 return;
2285
2286         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2287                 return;
2288
2289         link_unref(set_remove(master->slaves, link));
2290 }
2291
2292 static void link_detach_from_manager(Link *link) {
2293         if (!link || !link->manager)
2294                 return;
2295
2296         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2297         link_clean(link);
2298
2299         /* The following must be called at last. */
2300         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2301         link_unref(link);
2302 }
2303
2304 void link_drop(Link *link) {
2305         if (!link || link->state == LINK_STATE_LINGER)
2306                 return;
2307
2308         link_set_state(link, LINK_STATE_LINGER);
2309
2310         link_free_carrier_maps(link);
2311
2312         if (link->network) {
2313                 link_drop_from_master(link, link->network->bridge);
2314                 link_drop_from_master(link, link->network->bond);
2315         }
2316
2317         log_link_debug(link, "Link removed");
2318
2319         (void) unlink(link->state_file);
2320         link_detach_from_manager(link);
2321 }
2322
2323 static int link_joined(Link *link) {
2324         int r;
2325
2326         assert(link);
2327         assert(link->network);
2328
2329         if (!hashmap_isempty(link->bound_to_links)) {
2330                 r = link_handle_bound_to_list(link);
2331                 if (r < 0)
2332                         return r;
2333         } else if (!(link->flags & IFF_UP)) {
2334                 r = link_up(link);
2335                 if (r < 0) {
2336                         link_enter_failed(link);
2337                         return r;
2338                 }
2339         }
2340
2341         if (link->network->bridge) {
2342                 r = link_set_bridge(link);
2343                 if (r < 0)
2344                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2345
2346                 r = link_append_to_master(link, link->network->bridge);
2347                 if (r < 0)
2348                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2349         }
2350
2351         if (link->network->bond) {
2352                 r = link_set_bond(link);
2353                 if (r < 0)
2354                         log_link_error_errno(link, r, "Could not set bond message: %m");
2355
2356                 r = link_append_to_master(link, link->network->bond);
2357                 if (r < 0)
2358                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2359         }
2360
2361         if (link->network->use_br_vlan &&
2362             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2363                 r = link_set_bridge_vlan(link);
2364                 if (r < 0)
2365                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2366         }
2367
2368         /* Skip setting up addresses until it gets carrier,
2369            or it would try to set addresses twice,
2370            which is bad for non-idempotent steps. */
2371         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2372                 return 0;
2373
2374         link_set_state(link, LINK_STATE_CONFIGURING);
2375         return link_request_set_addresses(link);
2376 }
2377
2378 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2379         int r;
2380
2381         assert(link);
2382         assert(link->network);
2383         assert(link->enslaving > 0);
2384
2385         link->enslaving--;
2386
2387         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2388                 return 1;
2389
2390         r = sd_netlink_message_get_errno(m);
2391         if (r < 0 && r != -EEXIST) {
2392                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2393                 link_enter_failed(link);
2394                 return 1;
2395         }
2396
2397         log_link_debug(link, "Joined netdev");
2398
2399         if (link->enslaving == 0) {
2400                 r = link_joined(link);
2401                 if (r < 0)
2402                         link_enter_failed(link);
2403         }
2404
2405         return 1;
2406 }
2407
2408 static int link_enter_join_netdev(Link *link) {
2409         NetDev *netdev;
2410         Iterator i;
2411         int r;
2412
2413         assert(link);
2414         assert(link->network);
2415         assert(link->state == LINK_STATE_INITIALIZED);
2416
2417         link_set_state(link, LINK_STATE_CONFIGURING);
2418
2419         link_dirty(link);
2420         link->enslaving = 0;
2421
2422         if (link->network->bond) {
2423                 if (link->network->bond->state == NETDEV_STATE_READY &&
2424                     link->network->bond->ifindex == link->master_ifindex)
2425                         return link_joined(link);
2426
2427                 log_struct(LOG_DEBUG,
2428                            LOG_LINK_INTERFACE(link),
2429                            LOG_NETDEV_INTERFACE(link->network->bond),
2430                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2431
2432                 link->enslaving++;
2433
2434                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2435                 if (r < 0) {
2436                         log_struct_errno(LOG_WARNING, r,
2437                                          LOG_LINK_INTERFACE(link),
2438                                          LOG_NETDEV_INTERFACE(link->network->bond),
2439                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2440                         link_enter_failed(link);
2441                         return r;
2442                 }
2443         }
2444
2445         if (link->network->bridge) {
2446                 log_struct(LOG_DEBUG,
2447                            LOG_LINK_INTERFACE(link),
2448                            LOG_NETDEV_INTERFACE(link->network->bridge),
2449                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2450
2451                 link->enslaving++;
2452
2453                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2454                 if (r < 0) {
2455                         log_struct_errno(LOG_WARNING, r,
2456                                          LOG_LINK_INTERFACE(link),
2457                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2458                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2459                         link_enter_failed(link);
2460                         return r;
2461                 }
2462         }
2463
2464         if (link->network->vrf) {
2465                 log_struct(LOG_DEBUG,
2466                            LOG_LINK_INTERFACE(link),
2467                            LOG_NETDEV_INTERFACE(link->network->vrf),
2468                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2469
2470                 link->enslaving++;
2471
2472                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2473                 if (r < 0) {
2474                         log_struct_errno(LOG_WARNING, r,
2475                                          LOG_LINK_INTERFACE(link),
2476                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2477                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2478                         link_enter_failed(link);
2479                         return r;
2480                 }
2481         }
2482
2483         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2484
2485                 if (netdev->ifindex > 0)
2486                         /* Assume already enslaved. */
2487                         continue;
2488
2489                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2490                         continue;
2491
2492                 log_struct(LOG_DEBUG,
2493                            LOG_LINK_INTERFACE(link),
2494                            LOG_NETDEV_INTERFACE(netdev),
2495                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2496
2497                 link->enslaving++;
2498
2499                 r = netdev_join(netdev, link, netdev_join_handler);
2500                 if (r < 0) {
2501                         log_struct_errno(LOG_WARNING, r,
2502                                          LOG_LINK_INTERFACE(link),
2503                                          LOG_NETDEV_INTERFACE(netdev),
2504                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2505                         link_enter_failed(link);
2506                         return r;
2507                 }
2508         }
2509
2510         if (link->enslaving == 0)
2511                 return link_joined(link);
2512
2513         return 0;
2514 }
2515
2516 static int link_set_ipv4_forward(Link *link) {
2517         int r;
2518
2519         if (!link_ipv4_forward_enabled(link))
2520                 return 0;
2521
2522         /* We propagate the forwarding flag from one interface to the
2523          * global setting one way. This means: as long as at least one
2524          * interface was configured at any time that had IP forwarding
2525          * enabled the setting will stay on for good. We do this
2526          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2527          * somewhat in sync (see below). */
2528
2529         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2530         if (r < 0)
2531                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2532
2533         return 0;
2534 }
2535
2536 static int link_set_ipv6_forward(Link *link) {
2537         int r;
2538
2539         if (!link_ipv6_forward_enabled(link))
2540                 return 0;
2541
2542         /* On Linux, the IPv6 stack does not know a per-interface
2543          * packet forwarding setting: either packet forwarding is on
2544          * for all, or off for all. We hence don't bother with a
2545          * per-interface setting, but simply propagate the interface
2546          * flag, if it is set, to the global flag, one-way. Note that
2547          * while IPv4 would allow a per-interface flag, we expose the
2548          * same behaviour there and also propagate the setting from
2549          * one to all, to keep things simple (see above). */
2550
2551         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2552         if (r < 0)
2553                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2554
2555         return 0;
2556 }
2557
2558 static int link_set_ipv6_privacy_extensions(Link *link) {
2559         IPv6PrivacyExtensions s;
2560         int r;
2561
2562         s = link_ipv6_privacy_extensions(link);
2563         if (s < 0)
2564                 return 0;
2565
2566         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2567         if (r < 0)
2568                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2569
2570         return 0;
2571 }
2572
2573 static int link_set_ipv6_accept_ra(Link *link) {
2574         int r;
2575
2576         /* Make this a NOP if IPv6 is not available */
2577         if (!socket_ipv6_is_supported())
2578                 return 0;
2579
2580         if (link->flags & IFF_LOOPBACK)
2581                 return 0;
2582
2583         if (!link->network)
2584                 return 0;
2585
2586         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2587         if (r < 0)
2588                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2589
2590         return 0;
2591 }
2592
2593 static int link_set_ipv6_dad_transmits(Link *link) {
2594         int r;
2595
2596         /* Make this a NOP if IPv6 is not available */
2597         if (!socket_ipv6_is_supported())
2598                 return 0;
2599
2600         if (link->flags & IFF_LOOPBACK)
2601                 return 0;
2602
2603         if (!link->network)
2604                 return 0;
2605
2606         if (link->network->ipv6_dad_transmits < 0)
2607                 return 0;
2608
2609         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2610         if (r < 0)
2611                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2612
2613         return 0;
2614 }
2615
2616 static int link_set_ipv6_hop_limit(Link *link) {
2617         int r;
2618
2619         /* Make this a NOP if IPv6 is not available */
2620         if (!socket_ipv6_is_supported())
2621                 return 0;
2622
2623         if (link->flags & IFF_LOOPBACK)
2624                 return 0;
2625
2626         if (!link->network)
2627                 return 0;
2628
2629         if (link->network->ipv6_hop_limit < 0)
2630                 return 0;
2631
2632         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2633         if (r < 0)
2634                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2635
2636         return 0;
2637 }
2638
2639 static int link_set_ipv6_mtu(Link *link) {
2640         int r;
2641
2642         /* Make this a NOP if IPv6 is not available */
2643         if (!socket_ipv6_is_supported())
2644                 return 0;
2645
2646         if (link->flags & IFF_LOOPBACK)
2647                 return 0;
2648
2649         if (link->network->ipv6_mtu == 0)
2650                 return 0;
2651
2652         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2653          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2654         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2655                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2656                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2657         }
2658
2659         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2660         if (r < 0) {
2661                 if (link->mtu < link->network->ipv6_mtu)
2662                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2663                                          link->network->ipv6_mtu, link->mtu);
2664                 else
2665                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2666         }
2667
2668         link->ipv6_mtu_set = true;
2669
2670         return 0;
2671 }
2672
2673 static int link_set_ipv4_accept_local(Link *link) {
2674         int r;
2675
2676         if (link->flags & IFF_LOOPBACK)
2677                 return 0;
2678
2679         if (link->network->ipv4_accept_local < 0)
2680                 return 0;
2681
2682         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2683         if (r < 0)
2684                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2685
2686         return 0;
2687 }
2688
2689 static bool link_is_static_address_configured(Link *link, Address *address) {
2690         Address *net_address;
2691
2692         assert(link);
2693         assert(address);
2694
2695         if (!link->network)
2696                 return false;
2697
2698         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2699                 if (address_equal(net_address, address))
2700                         return true;
2701                 else if (address->family == AF_INET6 && net_address->family == AF_INET6 &&
2702                          in_addr_equal(AF_INET6, &address->in_addr, &net_address->in_addr_peer) > 0)
2703                         return true;
2704
2705         return false;
2706 }
2707
2708 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2709         Neighbor *net_neighbor;
2710
2711         assert(link);
2712         assert(neighbor);
2713
2714         if (!link->network)
2715                 return false;
2716
2717         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2718                 if (neighbor_equal(net_neighbor, neighbor))
2719                         return true;
2720
2721         return false;
2722 }
2723
2724 static bool link_is_static_route_configured(Link *link, Route *route) {
2725         Route *net_route;
2726
2727         assert(link);
2728         assert(route);
2729
2730         if (!link->network)
2731                 return false;
2732
2733         LIST_FOREACH(routes, net_route, link->network->static_routes)
2734                 if (route_equal(net_route, route))
2735                         return true;
2736
2737         return false;
2738 }
2739
2740 static bool link_address_is_dynamic(Link *link, Address *address) {
2741         Route *route;
2742         Iterator i;
2743
2744         assert(link);
2745         assert(address);
2746
2747         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2748                 return true;
2749
2750         /* Even when the address is leased from a DHCP server, networkd assign the address
2751          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2752          * corresponding routes with RTPROT_DHCP. */
2753         SET_FOREACH(route, link->routes_foreign, i) {
2754                 if (route->protocol != RTPROT_DHCP)
2755                         continue;
2756
2757                 if (address->family != route->family)
2758                         continue;
2759
2760                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2761                         return true;
2762         }
2763
2764         return false;
2765 }
2766
2767 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2768         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2769         sd_netlink_message *addr;
2770         int r;
2771
2772         assert(link);
2773         assert(link->manager);
2774         assert(link->manager->rtnl);
2775
2776         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2777         if (r < 0)
2778                 return r;
2779
2780         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2781         if (r < 0)
2782                 return r;
2783
2784         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2785                 unsigned char flags;
2786                 int ifindex;
2787
2788                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2789                 if (r < 0) {
2790                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2791                         continue;
2792                 } else if (link->ifindex != ifindex)
2793                         continue;
2794
2795                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2796                 if (r < 0) {
2797                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2798                         continue;
2799                 } else if (!(flags & IFA_F_TENTATIVE))
2800                         continue;
2801
2802                 log_link_debug(link, "Found tentative ipv6 link-local address");
2803                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2804         }
2805
2806         return 0;
2807 }
2808
2809 static int link_drop_foreign_config(Link *link) {
2810         Address *address;
2811         Neighbor *neighbor;
2812         Route *route;
2813         Iterator i;
2814         int r;
2815
2816         /* The kernel doesn't notify us about tentative addresses;
2817          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2818         if (!link_ipv6ll_enabled(link)) {
2819                 r = link_enumerate_ipv6_tentative_addresses(link);
2820                 if (r < 0)
2821                         return r;
2822         }
2823
2824         SET_FOREACH(address, link->addresses_foreign, i) {
2825                 /* we consider IPv6LL addresses to be managed by the kernel */
2826                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2827                         continue;
2828
2829                 if (link_address_is_dynamic(link, address)) {
2830                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2831                                 continue;
2832                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2833                         continue;
2834
2835                 if (link_is_static_address_configured(link, address)) {
2836                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2837                         if (r < 0)
2838                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2839                 } else {
2840                         r = address_remove(address, link, NULL);
2841                         if (r < 0)
2842                                 return r;
2843                 }
2844         }
2845
2846         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2847                 if (link_is_neighbor_configured(link, neighbor)) {
2848                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2849                         if (r < 0)
2850                                 return r;
2851                 } else {
2852                         r = neighbor_remove(neighbor, link, NULL);
2853                         if (r < 0)
2854                                 return r;
2855                 }
2856         }
2857
2858         SET_FOREACH(route, link->routes_foreign, i) {
2859                 /* do not touch routes managed by the kernel */
2860                 if (route->protocol == RTPROT_KERNEL)
2861                         continue;
2862
2863                 /* do not touch multicast route added by kernel */
2864                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2865                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2866                 if (route->protocol == RTPROT_BOOT &&
2867                     route->family == AF_INET6 &&
2868                     route->dst_prefixlen == 8 &&
2869                     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 }}} }))
2870                         continue;
2871
2872                 if (route->protocol == RTPROT_STATIC && link->network &&
2873                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2874                         continue;
2875
2876                 if (route->protocol == RTPROT_DHCP && link->network &&
2877                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2878                         continue;
2879
2880                 if (link_is_static_route_configured(link, route)) {
2881                         r = route_add(link, route, NULL);
2882                         if (r < 0)
2883                                 return r;
2884                 } else {
2885                         r = route_remove(route, link, NULL);
2886                         if (r < 0)
2887                                 return r;
2888                 }
2889         }
2890
2891         return 0;
2892 }
2893
2894 static int remove_static_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2895         int r;
2896
2897         assert(m);
2898         assert(link);
2899         assert(link->ifname);
2900         assert(link->address_remove_messages > 0);
2901
2902         link->address_remove_messages--;
2903
2904         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2905                 return 1;
2906
2907         r = sd_netlink_message_get_errno(m);
2908         if (r < 0 && r != -EADDRNOTAVAIL)
2909                 log_link_message_warning_errno(link, m, r, "Could not drop address");
2910         else if (r >= 0)
2911                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
2912
2913         if (link->address_remove_messages == 0 && link->request_static_addresses) {
2914                 link_set_state(link, LINK_STATE_CONFIGURING);
2915                 r = link_request_set_addresses(link);
2916                 if (r < 0)
2917                         link_enter_failed(link);
2918         }
2919
2920         return 1;
2921 }
2922
2923 static int link_drop_config(Link *link) {
2924         Address *address, *pool_address;
2925         Neighbor *neighbor;
2926         Route *route;
2927         Iterator i;
2928         int r;
2929
2930         SET_FOREACH(address, link->addresses, i) {
2931                 /* we consider IPv6LL addresses to be managed by the kernel */
2932                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2933                         continue;
2934
2935                 r = address_remove(address, link, remove_static_address_handler);
2936                 if (r < 0)
2937                         return r;
2938
2939                 link->address_remove_messages++;
2940
2941                 /* If this address came from an address pool, clean up the pool */
2942                 LIST_FOREACH(addresses, pool_address, link->pool_addresses)
2943                         if (address_equal(address, pool_address)) {
2944                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2945                                 address_free(pool_address);
2946                                 break;
2947                         }
2948         }
2949
2950         SET_FOREACH(neighbor, link->neighbors, i) {
2951                 r = neighbor_remove(neighbor, link, NULL);
2952                 if (r < 0)
2953                         return r;
2954         }
2955
2956         SET_FOREACH(route, link->routes, i) {
2957                 /* do not touch routes managed by the kernel */
2958                 if (route->protocol == RTPROT_KERNEL)
2959                         continue;
2960
2961                 r = route_remove(route, link, NULL);
2962                 if (r < 0)
2963                         return r;
2964         }
2965
2966         ndisc_flush(link);
2967
2968         return 0;
2969 }
2970
2971 static int link_configure_ipv4_dad(Link *link) {
2972         Address *address;
2973         int r;
2974
2975         assert(link);
2976         assert(link->network);
2977
2978         LIST_FOREACH(addresses, address, link->network->static_addresses)
2979                 if (address->family == AF_INET &&
2980                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2981                         r = configure_ipv4_duplicate_address_detection(link, address);
2982                         if (r < 0)
2983                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2984                 }
2985
2986         return 0;
2987 }
2988
2989 static int link_configure_traffic_control(Link *link) {
2990         TrafficControl *tc;
2991         Iterator i;
2992         int r;
2993
2994         link->tc_configured = false;
2995         link->tc_messages = 0;
2996
2997         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2998                 r = traffic_control_configure(link, tc);
2999                 if (r < 0)
3000                         return r;
3001         }
3002
3003         if (link->tc_messages == 0)
3004                 link->tc_configured = true;
3005         else
3006                 log_link_debug(link, "Configuring traffic control");
3007
3008         return 0;
3009 }
3010
3011 static int link_configure_sr_iov(Link *link) {
3012         SRIOV *sr_iov;
3013         Iterator i;
3014         int r;
3015
3016         link->sr_iov_configured = false;
3017         link->sr_iov_messages = 0;
3018
3019         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section, i) {
3020                 r = sr_iov_configure(link, sr_iov);
3021                 if (r < 0)
3022                         return r;
3023         }
3024
3025         if (link->sr_iov_messages == 0)
3026                 link->sr_iov_configured = true;
3027         else
3028                 log_link_debug(link, "Configuring SR-IOV");
3029
3030         return 0;
3031 }
3032
3033 static int link_configure(Link *link) {
3034         int r;
3035
3036         assert(link);
3037         assert(link->network);
3038         assert(link->state == LINK_STATE_INITIALIZED);
3039
3040         r = link_configure_traffic_control(link);
3041         if (r < 0)
3042                 return r;
3043
3044         r = link_configure_sr_iov(link);
3045         if (r < 0)
3046                 return r;
3047
3048         if (link->iftype == ARPHRD_CAN)
3049                 return link_configure_can(link);
3050
3051         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
3052          * for this interface, then enable IPv6 */
3053         (void) link_update_ipv6_sysctl(link);
3054
3055         r = link_set_proxy_arp(link);
3056         if (r < 0)
3057                return r;
3058
3059         r = ipv6_proxy_ndp_addresses_configure(link);
3060         if (r < 0)
3061                 return r;
3062
3063         r = link_set_ipv4_forward(link);
3064         if (r < 0)
3065                 return r;
3066
3067         r = link_set_ipv6_forward(link);
3068         if (r < 0)
3069                 return r;
3070
3071         r = link_set_ipv6_privacy_extensions(link);
3072         if (r < 0)
3073                 return r;
3074
3075         r = link_set_ipv6_accept_ra(link);
3076         if (r < 0)
3077                 return r;
3078
3079         r = link_set_ipv6_dad_transmits(link);
3080         if (r < 0)
3081                 return r;
3082
3083         r = link_set_ipv6_hop_limit(link);
3084         if (r < 0)
3085                 return r;
3086
3087         r = link_set_ipv4_accept_local(link);
3088         if (r < 0)
3089                 return r;
3090
3091         r = link_set_flags(link);
3092         if (r < 0)
3093                 return r;
3094
3095         r = link_set_group(link);
3096         if (r < 0)
3097                 return r;
3098
3099         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
3100                 r = ipv4ll_configure(link);
3101                 if (r < 0)
3102                         return r;
3103         }
3104
3105         if (link_dhcp4_enabled(link)) {
3106                 r = dhcp4_set_promote_secondaries(link);
3107                 if (r < 0)
3108                         return r;
3109
3110                 r = dhcp4_configure(link);
3111                 if (r < 0)
3112                         return r;
3113         }
3114
3115         if (link_dhcp4_server_enabled(link)) {
3116                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3117                 if (r < 0)
3118                         return r;
3119
3120                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3121                 if (r < 0)
3122                         return r;
3123         }
3124
3125         if (link_dhcp6_enabled(link) ||
3126             link_ipv6_accept_ra_enabled(link)) {
3127                 r = dhcp6_configure(link);
3128                 if (r < 0)
3129                         return r;
3130         }
3131
3132         if (link_ipv6_accept_ra_enabled(link)) {
3133                 r = ndisc_configure(link);
3134                 if (r < 0)
3135                         return r;
3136         }
3137
3138         if (link_radv_enabled(link)) {
3139                 r = radv_configure(link);
3140                 if (r < 0)
3141                         return r;
3142         }
3143
3144         if (link_lldp_rx_enabled(link)) {
3145                 r = link_lldp_rx_configure(link);
3146                 if (r < 0)
3147                         return r;
3148         }
3149
3150         r = link_configure_mtu(link);
3151         if (r < 0)
3152                 return r;
3153
3154         r = link_configure_addrgen_mode(link);
3155         if (r < 0)
3156                 return r;
3157
3158         r = link_configure_ipv4_dad(link);
3159         if (r < 0)
3160                 return r;
3161
3162         return link_configure_continue(link);
3163 }
3164
3165 /* The configuration continues in this separate function, instead of
3166  * including this in the above link_configure() function, for two
3167  * reasons:
3168  * 1) some devices reset the link when the mtu is set, which caused
3169  *    an infinite loop here in networkd; see:
3170  *    https://github.com/systemd/systemd/issues/6593
3171  *    https://github.com/systemd/systemd/issues/9831
3172  * 2) if ipv6ll is disabled, then bringing the interface up must be
3173  *    delayed until after we get confirmation from the kernel that
3174  *    the addr_gen_mode parameter has been set (via netlink), see:
3175  *    https://github.com/systemd/systemd/issues/13882
3176  */
3177 static int link_configure_continue(Link *link) {
3178         int r;
3179
3180         assert(link);
3181         assert(link->network);
3182         assert(link->state == LINK_STATE_INITIALIZED);
3183
3184         if (link->setting_mtu || link->setting_genmode)
3185                 return 0;
3186
3187         /* Drop foreign config, but ignore loopback or critical devices.
3188          * We do not want to remove loopback address or addresses used for root NFS. */
3189         if (!(link->flags & IFF_LOOPBACK) &&
3190             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3191                 r = link_drop_foreign_config(link);
3192                 if (r < 0)
3193                         return r;
3194         }
3195
3196         /* The kernel resets ipv6 mtu after changing device mtu;
3197          * we must set this here, after we've set device mtu */
3198         r = link_set_ipv6_mtu(link);
3199         if (r < 0)
3200                 return r;
3201
3202         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3203                 r = link_acquire_conf(link);
3204                 if (r < 0)
3205                         return r;
3206         }
3207
3208         return link_enter_join_netdev(link);
3209 }
3210
3211 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3212         assert(duid);
3213
3214         if (duid->raw_data_len > 0)
3215                 return 0;
3216
3217         if (duid->type != DUID_TYPE_UUID)
3218                 return -EINVAL;
3219
3220         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3221         duid->raw_data_len = sizeof(sd_id128_t);
3222
3223         return 1;
3224 }
3225
3226 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3227         Manager *manager = userdata;
3228         const sd_bus_error *e;
3229         const void *a;
3230         size_t sz;
3231         DUID *duid;
3232         Link *link;
3233         int r;
3234
3235         assert(m);
3236         assert(manager);
3237
3238         e = sd_bus_message_get_error(m);
3239         if (e) {
3240                 log_error_errno(sd_bus_error_get_errno(e),
3241                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3242                                 e->message);
3243                 goto configure;
3244         }
3245
3246         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3247         if (r < 0)
3248                 goto configure;
3249
3250         if (sz != sizeof(sd_id128_t)) {
3251                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3252                 goto configure;
3253         }
3254
3255         memcpy(&manager->product_uuid, a, sz);
3256         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3257                 (void) duid_set_uuid(duid, manager->product_uuid);
3258
3259         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3260
3261 configure:
3262         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3263                 link_unref(link);
3264
3265                 r = link_configure(link);
3266                 if (r < 0)
3267                         link_enter_failed(link);
3268         }
3269
3270         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3271
3272         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3273          * even if the method fails. */
3274         manager->has_product_uuid = true;
3275
3276         return 1;
3277 }
3278
3279 static bool link_requires_uuid(Link *link) {
3280         const DUID *duid;
3281
3282         assert(link);
3283         assert(link->manager);
3284         assert(link->network);
3285
3286         duid = link_get_duid(link);
3287         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3288                 return false;
3289
3290         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3291                 return true;
3292
3293         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3294                 return true;
3295
3296         return false;
3297 }
3298
3299 static int link_configure_duid(Link *link) {
3300         Manager *m;
3301         DUID *duid;
3302         int r;
3303
3304         assert(link);
3305         assert(link->manager);
3306         assert(link->network);
3307
3308         m = link->manager;
3309         duid = link_get_duid(link);
3310
3311         if (!link_requires_uuid(link))
3312                 return 1;
3313
3314         if (m->has_product_uuid) {
3315                 (void) duid_set_uuid(duid, m->product_uuid);
3316                 return 1;
3317         }
3318
3319         if (!m->links_requesting_uuid) {
3320                 r = manager_request_product_uuid(m, link);
3321                 if (r < 0) {
3322                         if (r == -ENOMEM)
3323                                 return r;
3324
3325                         log_link_warning_errno(link, r,
3326                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3327                         return 1;
3328                 }
3329         } else {
3330                 r = set_put(m->links_requesting_uuid, link);
3331                 if (r < 0)
3332                         return log_oom();
3333                 if (r > 0)
3334                         link_ref(link);
3335
3336                 r = set_put(m->duids_requesting_uuid, duid);
3337                 if (r < 0)
3338                         return log_oom();
3339         }
3340
3341         return 0;
3342 }
3343
3344 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3345         Network *network;
3346         int r;
3347
3348         if (m) {
3349                 _cleanup_strv_free_ char **s = NULL;
3350
3351                 r = sd_netlink_message_get_errno(m);
3352                 if (r < 0)
3353                         return r;
3354
3355                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3356                 if (r < 0 && r != -ENODATA)
3357                         return r;
3358
3359                 strv_free_and_replace(link->alternative_names, s);
3360         }
3361
3362         r = network_get(link->manager, link->iftype, link->sd_device,
3363                         link->ifname, link->alternative_names, link->driver,
3364                         &link->mac, &link->permanent_mac,
3365                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3366         if (r == -ENOENT) {
3367                 link_enter_unmanaged(link);
3368                 return 0;
3369         } else if (r == 0 && network->unmanaged) {
3370                 link_enter_unmanaged(link);
3371                 return 0;
3372         } else if (r < 0)
3373                 return r;
3374
3375         if (link->network == network && !force)
3376                 return 0;
3377
3378         log_link_info(link, "Re-configuring with %s", network->filename);
3379
3380         /* Dropping old .network file */
3381         r = link_stop_clients(link, false);
3382         if (r < 0)
3383                 return r;
3384
3385         if (link_dhcp4_server_enabled(link))
3386                 (void) sd_dhcp_server_stop(link->dhcp_server);
3387
3388         r = link_drop_config(link);
3389         if (r < 0)
3390                 return r;
3391
3392         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3393                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3394                 r = link_drop_foreign_config(link);
3395                 if (r < 0)
3396                         return r;
3397         }
3398
3399         link_free_carrier_maps(link);
3400         link_free_engines(link);
3401         link->network = network_unref(link->network);
3402
3403         /* Then, apply new .network file */
3404         r = network_apply(network, link);
3405         if (r < 0)
3406                 return r;
3407
3408         r = link_new_carrier_maps(link);
3409         if (r < 0)
3410                 return r;
3411
3412         link_set_state(link, LINK_STATE_INITIALIZED);
3413         link_dirty(link);
3414
3415         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3416          * link_configure() is called later asynchronously. */
3417         r = link_configure_duid(link);
3418         if (r <= 0)
3419                 return r;
3420
3421         r = link_configure(link);
3422         if (r < 0)
3423                 return r;
3424
3425         return 0;
3426 }
3427
3428 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3429         int r;
3430
3431         r = link_reconfigure_internal(link, m, false);
3432         if (r < 0)
3433                 link_enter_failed(link);
3434
3435         return 1;
3436 }
3437
3438 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3439         int r;
3440
3441         r = link_reconfigure_internal(link, m, true);
3442         if (r < 0)
3443                 link_enter_failed(link);
3444
3445         return 1;
3446 }
3447
3448 int link_reconfigure(Link *link, bool force) {
3449         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3450         int r;
3451
3452         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3453                 return 0;
3454
3455         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3456                                      link->ifindex);
3457         if (r < 0)
3458                 return r;
3459
3460         r = netlink_call_async(link->manager->rtnl, NULL, req,
3461                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3462                                link_netlink_destroy_callback, link);
3463         if (r < 0)
3464                 return r;
3465
3466         link_ref(link);
3467
3468         return 0;
3469 }
3470
3471 static int link_initialized_and_synced(Link *link) {
3472         Network *network;
3473         int r;
3474
3475         assert(link);
3476         assert(link->ifname);
3477         assert(link->manager);
3478
3479         /* We may get called either from the asynchronous netlink callback,
3480          * or directly for link_add() if running in a container. See link_add(). */
3481         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3482                 return 0;
3483
3484         log_link_debug(link, "Link state is up-to-date");
3485         link_set_state(link, LINK_STATE_INITIALIZED);
3486
3487         r = link_new_bound_by_list(link);
3488         if (r < 0)
3489                 return r;
3490
3491         r = link_handle_bound_by_list(link);
3492         if (r < 0)
3493                 return r;
3494
3495         if (!link->network) {
3496                 r = wifi_get_info(link);
3497                 if (r < 0)
3498                         return r;
3499
3500                 r = network_get(link->manager, link->iftype, link->sd_device,
3501                                 link->ifname, link->alternative_names, link->driver,
3502                                 &link->mac, &link->permanent_mac,
3503                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3504                 if (r == -ENOENT) {
3505                         link_enter_unmanaged(link);
3506                         return 0;
3507                 } else if (r == 0 && network->unmanaged) {
3508                         link_enter_unmanaged(link);
3509                         return 0;
3510                 } else if (r < 0)
3511                         return r;
3512
3513                 if (link->flags & IFF_LOOPBACK) {
3514                         if (network->link_local != ADDRESS_FAMILY_NO)
3515                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3516
3517                         if (network->dhcp != ADDRESS_FAMILY_NO)
3518                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3519
3520                         if (network->dhcp_server)
3521                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3522                 }
3523
3524                 r = network_apply(network, link);
3525                 if (r < 0)
3526                         return r;
3527         }
3528
3529         r = link_new_bound_to_list(link);
3530         if (r < 0)
3531                 return r;
3532
3533         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3534          * link_configure() is called later asynchronously. */
3535         r = link_configure_duid(link);
3536         if (r <= 0)
3537                 return r;
3538
3539         r = link_configure(link);
3540         if (r < 0)
3541                 return r;
3542
3543         return 0;
3544 }
3545
3546 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3547         _cleanup_strv_free_ char **s = NULL;
3548         int r;
3549
3550         r = sd_netlink_message_get_errno(m);
3551         if (r < 0) {
3552                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3553                 link_enter_failed(link);
3554                 return 0;
3555         }
3556
3557         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3558         if (r < 0 && r != -ENODATA) {
3559                 link_enter_failed(link);
3560                 return 0;
3561         }
3562
3563         strv_free_and_replace(link->alternative_names, s);
3564
3565         r = link_initialized_and_synced(link);
3566         if (r < 0)
3567                 link_enter_failed(link);
3568         return 1;
3569 }
3570
3571 int link_initialized(Link *link, sd_device *device) {
3572         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3573         int r;
3574
3575         assert(link);
3576         assert(link->manager);
3577         assert(link->manager->rtnl);
3578         assert(device);
3579
3580         if (link->state != LINK_STATE_PENDING)
3581                 return 0;
3582
3583         if (link->sd_device)
3584                 return 0;
3585
3586         log_link_debug(link, "udev initialized link");
3587         link_set_state(link, LINK_STATE_INITIALIZED);
3588
3589         link->sd_device = sd_device_ref(device);
3590
3591         /* udev has initialized the link, but we don't know if we have yet
3592          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3593          * when it returns we know that the pending NEWLINKs have already been
3594          * processed and that we are up-to-date */
3595
3596         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3597                                      link->ifindex);
3598         if (r < 0)
3599                 return r;
3600
3601         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3602                                link_netlink_destroy_callback, link);
3603         if (r < 0)
3604                 return r;
3605
3606         link_ref(link);
3607
3608         return 0;
3609 }
3610
3611 static int link_load(Link *link) {
3612         _cleanup_free_ char *network_file = NULL,
3613                             *addresses = NULL,
3614                             *routes = NULL,
3615                             *dhcp4_address = NULL,
3616                             *ipv4ll_address = NULL;
3617         union in_addr_union address;
3618         int r;
3619
3620         assert(link);
3621
3622         r = parse_env_file(NULL, link->state_file,
3623                            "NETWORK_FILE", &network_file,
3624                            "ADDRESSES", &addresses,
3625                            "ROUTES", &routes,
3626                            "DHCP4_ADDRESS", &dhcp4_address,
3627                            "IPV4LL_ADDRESS", &ipv4ll_address);
3628         if (r < 0 && r != -ENOENT)
3629                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3630
3631         if (network_file) {
3632                 Network *network;
3633                 char *suffix;
3634
3635                 /* drop suffix */
3636                 suffix = strrchr(network_file, '.');
3637                 if (!suffix) {
3638                         log_link_debug(link, "Failed to get network name from %s", network_file);
3639                         goto network_file_fail;
3640                 }
3641                 *suffix = '\0';
3642
3643                 r = network_get_by_name(link->manager, basename(network_file), &network);
3644                 if (r < 0) {
3645                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3646                         goto network_file_fail;
3647                 }
3648
3649                 r = network_apply(network, link);
3650                 if (r < 0)
3651                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3652         }
3653
3654 network_file_fail:
3655
3656         for (const char *p = addresses; p; ) {
3657                 _cleanup_free_ char *address_str = NULL;
3658                 char *prefixlen_str;
3659                 int family;
3660                 unsigned char prefixlen;
3661
3662                 r = extract_first_word(&p, &address_str, NULL, 0);
3663                 if (r < 0)
3664                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3665                 if (r <= 0)
3666                         break;
3667
3668                 prefixlen_str = strchr(address_str, '/');
3669                 if (!prefixlen_str) {
3670                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3671                         continue;
3672                 }
3673                 *prefixlen_str++ = '\0';
3674
3675                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3676                 if (r != 1) {
3677                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3678                         continue;
3679                 }
3680
3681                 r = in_addr_from_string_auto(address_str, &family, &address);
3682                 if (r < 0) {
3683                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3684                         continue;
3685                 }
3686
3687                 r = address_add(link, family, &address, prefixlen, NULL);
3688                 if (r < 0)
3689                         return log_link_error_errno(link, r, "Failed to add address: %m");
3690         }
3691
3692         for (const char *p = routes; p; ) {
3693                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3694                 _cleanup_(route_freep) Route *tmp = NULL;
3695                 _cleanup_free_ char *route_str = NULL;
3696                 char *prefixlen_str;
3697                 Route *route;
3698
3699                 r = extract_first_word(&p, &route_str, NULL, 0);
3700                 if (r < 0)
3701                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3702                 if (r <= 0)
3703                         break;
3704
3705                 prefixlen_str = strchr(route_str, '/');
3706                 if (!prefixlen_str) {
3707                         log_link_debug(link, "Failed to parse route %s", route_str);
3708                         continue;
3709                 }
3710                 *prefixlen_str++ = '\0';
3711
3712                 r = route_new(&tmp);
3713                 if (r < 0)
3714                         return log_oom();
3715
3716                 r = sscanf(prefixlen_str,
3717                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3718                            &tmp->dst_prefixlen,
3719                            &tmp->tos,
3720                            &tmp->priority,
3721                            &tmp->table,
3722                            &tmp->lifetime);
3723                 if (r != 5) {
3724                         log_link_debug(link,
3725                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3726                                        prefixlen_str);
3727                         continue;
3728                 }
3729
3730                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3731                 if (r < 0) {
3732                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3733                         continue;
3734                 }
3735
3736                 r = route_add(link, tmp, &route);
3737                 if (r < 0)
3738                         return log_link_error_errno(link, r, "Failed to add route: %m");
3739
3740                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3741                         r = sd_event_add_time(link->manager->event, &expire,
3742                                               clock_boottime_or_monotonic(),
3743                                               route->lifetime, 0, route_expire_handler, route);
3744                         if (r < 0)
3745                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3746                 }
3747
3748                 sd_event_source_unref(route->expire);
3749                 route->expire = TAKE_PTR(expire);
3750         }
3751
3752         if (dhcp4_address) {
3753                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3754                 if (r < 0) {
3755                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3756                         goto dhcp4_address_fail;
3757                 }
3758
3759                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3760                 if (r < 0)
3761                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3762
3763                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3764                 if (r < 0)
3765                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3766
3767                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3768                 if (r < 0)
3769                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3770         }
3771
3772 dhcp4_address_fail:
3773
3774         if (ipv4ll_address) {
3775                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3776                 if (r < 0) {
3777                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3778                         goto ipv4ll_address_fail;
3779                 }
3780
3781                 r = sd_ipv4ll_new(&link->ipv4ll);
3782                 if (r < 0)
3783                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3784
3785                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3786                 if (r < 0)
3787                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3788
3789                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3790                 if (r < 0)
3791                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3792         }
3793
3794 ipv4ll_address_fail:
3795
3796         return 0;
3797 }
3798
3799 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3800         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3801         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3802         Link *link;
3803         int r;
3804
3805         assert(m);
3806         assert(m->rtnl);
3807         assert(message);
3808         assert(ret);
3809
3810         r = link_new(m, message, ret);
3811         if (r < 0)
3812                 return r;
3813
3814         link = *ret;
3815
3816         log_link_debug(link, "Link %d added", link->ifindex);
3817
3818         r = link_load(link);
3819         if (r < 0)
3820                 return r;
3821
3822         if (path_is_read_only_fs("/sys") <= 0) {
3823                 /* udev should be around */
3824                 sprintf(ifindex_str, "n%d", link->ifindex);
3825                 r = sd_device_new_from_device_id(&device, ifindex_str);
3826                 if (r < 0) {
3827                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3828                         return 0;
3829                 }
3830
3831                 r = sd_device_get_is_initialized(device);
3832                 if (r < 0) {
3833                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3834                         goto failed;
3835                 }
3836                 if (r == 0) {
3837                         /* not yet ready */
3838                         log_link_debug(link, "link pending udev initialization...");
3839                         return 0;
3840                 }
3841
3842                 r = device_is_renaming(device);
3843                 if (r < 0) {
3844                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3845                         goto failed;
3846                 }
3847                 if (r > 0) {
3848                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3849                         return 0;
3850                 }
3851
3852                 r = link_initialized(link, device);
3853                 if (r < 0)
3854                         goto failed;
3855         } else {
3856                 r = link_initialized_and_synced(link);
3857                 if (r < 0)
3858                         goto failed;
3859         }
3860
3861         return 0;
3862 failed:
3863         link_enter_failed(link);
3864         return r;
3865 }
3866
3867 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3868         int r;
3869
3870         assert(link);
3871
3872         log_link_info(link, "Gained IPv6LL");
3873
3874         link->ipv6ll_address = *address;
3875         link_check_ready(link);
3876
3877         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3878                 r = link_acquire_ipv6_conf(link);
3879                 if (r < 0) {
3880                         link_enter_failed(link);
3881                         return r;
3882                 }
3883         }
3884
3885         return 0;
3886 }
3887
3888 static int link_carrier_gained(Link *link) {
3889         int r;
3890
3891         assert(link);
3892
3893         r = wifi_get_info(link);
3894         if (r < 0)
3895                 return r;
3896         if (r > 0) {
3897                 r = link_reconfigure_internal(link, NULL, false);
3898                 if (r < 0) {
3899                         link_enter_failed(link);
3900                         return r;
3901                 }
3902         }
3903
3904         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3905                 r = link_acquire_conf(link);
3906                 if (r < 0) {
3907                         link_enter_failed(link);
3908                         return r;
3909                 }
3910
3911                 link_set_state(link, LINK_STATE_CONFIGURING);
3912                 r = link_request_set_addresses(link);
3913                 if (r < 0)
3914                         return r;
3915         }
3916
3917         r = link_handle_bound_by_list(link);
3918         if (r < 0)
3919                 return r;
3920
3921         return 0;
3922 }
3923
3924 static int link_carrier_lost(Link *link) {
3925         int r;
3926
3927         assert(link);
3928
3929         if (link->network && link->network->ignore_carrier_loss)
3930                 return 0;
3931
3932         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3933          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3934          * configuration and stop the clients as well. */
3935         if (link->setting_mtu)
3936                 return 0;
3937
3938         r = link_stop_clients(link, false);
3939         if (r < 0) {
3940                 link_enter_failed(link);
3941                 return r;
3942         }
3943
3944         if (link_dhcp4_server_enabled(link))
3945                 (void) sd_dhcp_server_stop(link->dhcp_server);
3946
3947         r = link_drop_config(link);
3948         if (r < 0)
3949                 return r;
3950
3951         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3952                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3953                 r = link_drop_foreign_config(link);
3954                 if (r < 0)
3955                         return r;
3956         }
3957
3958         r = link_handle_bound_by_list(link);
3959         if (r < 0)
3960                 return r;
3961
3962         return 0;
3963 }
3964
3965 int link_carrier_reset(Link *link) {
3966         int r;
3967
3968         assert(link);
3969
3970         if (link_has_carrier(link)) {
3971                 r = link_carrier_lost(link);
3972                 if (r < 0)
3973                         return r;
3974
3975                 r = link_carrier_gained(link);
3976                 if (r < 0)
3977                         return r;
3978
3979                 log_link_info(link, "Reset carrier");
3980         }
3981
3982         return 0;
3983 }
3984
3985 /* This is called every time an interface admin state changes to up;
3986  * specifically, when IFF_UP flag changes from unset to set */
3987 static int link_admin_state_up(Link *link) {
3988         int r;
3989
3990         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3991          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3992          * ipv6_mtu_set prevents this from trying to set it too early before
3993          * the link->network has been setup; we only need to reset it
3994          * here if we've already set it during normal initialization. */
3995         if (link->ipv6_mtu_set) {
3996                 r = link_set_ipv6_mtu(link);
3997                 if (r < 0)
3998                         return r;
3999         }
4000
4001         return 0;
4002 }
4003
4004 int link_update(Link *link, sd_netlink_message *m) {
4005         _cleanup_strv_free_ char **s = NULL;
4006         struct ether_addr mac;
4007         const char *ifname;
4008         uint32_t mtu;
4009         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
4010         int old_master, r;
4011
4012         assert(link);
4013         assert(link->ifname);
4014         assert(m);
4015
4016         if (link->state == LINK_STATE_LINGER) {
4017                 log_link_info(link, "Link re-added");
4018                 link_set_state(link, LINK_STATE_CONFIGURING);
4019
4020                 r = link_new_carrier_maps(link);
4021                 if (r < 0)
4022                         return r;
4023         }
4024
4025         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
4026         if (r >= 0 && !streq(ifname, link->ifname)) {
4027                 Manager *manager = link->manager;
4028
4029                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
4030
4031                 link_drop(link);
4032                 r = link_add(manager, m, &link);
4033                 if (r < 0)
4034                         return r;
4035         }
4036
4037         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
4038         if (r >= 0)
4039                 strv_free_and_replace(link->alternative_names, s);
4040
4041         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
4042         if (r >= 0 && mtu > 0) {
4043                 link->mtu = mtu;
4044                 if (link->original_mtu == 0) {
4045                         link->original_mtu = mtu;
4046                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
4047                 }
4048
4049                 if (link->dhcp_client) {
4050                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
4051                                                    link->mtu);
4052                         if (r < 0)
4053                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
4054                 }
4055
4056                 if (link->radv) {
4057                         r = sd_radv_set_mtu(link->radv, link->mtu);
4058                         if (r < 0)
4059                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
4060                 }
4061         }
4062
4063         /* The kernel may broadcast NEWLINK messages without the MAC address
4064            set, simply ignore them. */
4065         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
4066         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
4067
4068                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
4069
4070                 log_link_debug(link, "Gained new MAC address: "
4071                                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
4072                                mac.ether_addr_octet[0],
4073                                mac.ether_addr_octet[1],
4074                                mac.ether_addr_octet[2],
4075                                mac.ether_addr_octet[3],
4076                                mac.ether_addr_octet[4],
4077                                mac.ether_addr_octet[5]);
4078
4079                 if (link->ipv4ll) {
4080                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
4081
4082                         if (restart) {
4083                                 r = sd_ipv4ll_stop(link->ipv4ll);
4084                                 if (r < 0)
4085                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
4086                         }
4087
4088                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
4089                         if (r < 0)
4090                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
4091
4092                         if (restart) {
4093                                 r = sd_ipv4ll_start(link->ipv4ll);
4094                                 if (r < 0)
4095                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
4096                         }
4097                 }
4098
4099                 if (link->dhcp_client) {
4100                         r = sd_dhcp_client_set_mac(link->dhcp_client,
4101                                                    (const uint8_t *) &link->mac,
4102                                                    sizeof (link->mac),
4103                                                    ARPHRD_ETHER);
4104                         if (r < 0)
4105                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
4106
4107                         r = dhcp4_set_client_identifier(link);
4108                         if (r < 0)
4109                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
4110                 }
4111
4112                 if (link->dhcp6_client) {
4113                         const DUID* duid = link_get_duid(link);
4114                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
4115
4116                         if (restart) {
4117                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
4118                                 if (r < 0)
4119                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
4120                         }
4121
4122                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
4123                                                     (const uint8_t *) &link->mac,
4124                                                     sizeof (link->mac),
4125                                                     ARPHRD_ETHER);
4126                         if (r < 0)
4127                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4128
4129                         if (link->network->iaid_set) {
4130                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4131                                 if (r < 0)
4132                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4133                         }
4134
4135                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4136                                                      duid->type,
4137                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4138                                                      duid->raw_data_len);
4139                         if (r < 0)
4140                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4141
4142                         if (restart) {
4143                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4144                                 if (r < 0)
4145                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4146                         }
4147                 }
4148
4149                 if (link->radv) {
4150                         bool restart = sd_radv_is_running(link->radv);
4151
4152                         if (restart) {
4153                                 r = sd_radv_stop(link->radv);
4154                                 if (r < 0)
4155                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4156                         }
4157
4158                         r = sd_radv_set_mac(link->radv, &link->mac);
4159                         if (r < 0)
4160                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4161
4162                         if (restart) {
4163                                 r = sd_radv_start(link->radv);
4164                                 if (r < 0)
4165                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4166                         }
4167                 }
4168
4169                 if (link->ndisc) {
4170                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4171                         if (r < 0)
4172                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4173                 }
4174         }
4175
4176         old_master = link->master_ifindex;
4177         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4178
4179         link_was_admin_up = link->flags & IFF_UP;
4180         had_carrier = link_has_carrier(link);
4181
4182         r = link_update_flags(link, m, old_master != link->master_ifindex);
4183         if (r < 0)
4184                 return r;
4185
4186         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4187                 log_link_info(link, "Link UP");
4188
4189                 r = link_admin_state_up(link);
4190                 if (r < 0)
4191                         return r;
4192         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4193                 log_link_info(link, "Link DOWN");
4194
4195         r = link_update_lldp(link);
4196         if (r < 0)
4197                 return r;
4198
4199         carrier_gained = !had_carrier && link_has_carrier(link);
4200         carrier_lost = had_carrier && !link_has_carrier(link);
4201
4202         if (carrier_gained) {
4203                 log_link_info(link, "Gained carrier");
4204
4205                 r = link_carrier_gained(link);
4206                 if (r < 0)
4207                         return r;
4208         } else if (carrier_lost) {
4209                 log_link_info(link, "Lost carrier");
4210
4211                 r = link_carrier_lost(link);
4212                 if (r < 0)
4213                         return r;
4214         }
4215
4216         return 0;
4217 }
4218
4219 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4220         bool space = false;
4221         Iterator i;
4222         Link *link;
4223
4224         assert(f);
4225         assert(prefix);
4226
4227         if (hashmap_isempty(h))
4228                 return;
4229
4230         fputs(prefix, f);
4231         HASHMAP_FOREACH(link, h, i) {
4232                 if (space)
4233                         fputc(' ', f);
4234
4235                 fprintf(f, "%i", link->ifindex);
4236                 space = true;
4237         }
4238
4239         fputc('\n', f);
4240 }
4241
4242 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4243         for (unsigned j = 0; j < n_dns; j++) {
4244                 const char *str;
4245
4246                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4247                         continue;
4248
4249                 str = in_addr_full_to_string(dns[j]);
4250                 if (!str)
4251                         continue;
4252
4253                 if (*space)
4254                         fputc(' ', f);
4255                 fputs(str, f);
4256                 *space = true;
4257         }
4258 }
4259
4260 static void serialize_addresses(
4261                 FILE *f,
4262                 const char *lvalue,
4263                 bool *space,
4264                 char **addresses,
4265                 sd_dhcp_lease *lease,
4266                 bool conditional,
4267                 sd_dhcp_lease_server_type what,
4268                 sd_dhcp6_lease *lease6,
4269                 bool conditional6,
4270                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4271                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4272         int r;
4273
4274         bool _space = false;
4275         if (!space)
4276                 space = &_space;
4277
4278         if (lvalue)
4279                 fprintf(f, "%s=", lvalue);
4280         fputstrv(f, addresses, NULL, space);
4281
4282         if (lease && conditional) {
4283                 const struct in_addr *lease_addresses;
4284
4285                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4286                 if (r > 0)
4287                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4288         }
4289
4290         if (lease6 && conditional6 && lease6_get_addr) {
4291                 const struct in6_addr *in6_addrs;
4292
4293                 r = lease6_get_addr(lease6, &in6_addrs);
4294                 if (r > 0)
4295                         serialize_in6_addrs(f, in6_addrs, r, space);
4296         }
4297
4298         if (lease6 && conditional6 && lease6_get_fqdn) {
4299                 char **in6_hosts;
4300
4301                 r = lease6_get_fqdn(lease6, &in6_hosts);
4302                 if (r > 0)
4303                         fputstrv(f, in6_hosts, NULL, space);
4304         }
4305
4306         if (lvalue)
4307                 fputc('\n', f);
4308 }
4309
4310 int link_save(Link *link) {
4311         const char *admin_state, *oper_state, *carrier_state, *address_state;
4312         _cleanup_free_ char *temp_path = NULL;
4313         _cleanup_fclose_ FILE *f = NULL;
4314         Route *route;
4315         Address *a;
4316         Iterator i;
4317         int r;
4318
4319         assert(link);
4320         assert(link->state_file);
4321         assert(link->lease_file);
4322         assert(link->manager);
4323
4324         if (link->state == LINK_STATE_LINGER) {
4325                 (void) unlink(link->state_file);
4326                 return 0;
4327         }
4328
4329         link_lldp_save(link);
4330
4331         admin_state = link_state_to_string(link->state);
4332         assert(admin_state);
4333
4334         oper_state = link_operstate_to_string(link->operstate);
4335         assert(oper_state);
4336
4337         carrier_state = link_carrier_state_to_string(link->carrier_state);
4338         assert(carrier_state);
4339
4340         address_state = link_address_state_to_string(link->address_state);
4341         assert(address_state);
4342
4343         r = fopen_temporary(link->state_file, &f, &temp_path);
4344         if (r < 0)
4345                 goto fail;
4346
4347         (void) fchmod(fileno(f), 0644);
4348
4349         fprintf(f,
4350                 "# This is private data. Do not parse.\n"
4351                 "ADMIN_STATE=%s\n"
4352                 "OPER_STATE=%s\n"
4353                 "CARRIER_STATE=%s\n"
4354                 "ADDRESS_STATE=%s\n",
4355                 admin_state, oper_state, carrier_state, address_state);
4356
4357         if (link->network) {
4358                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4359                 const char *dhcp_domainname = NULL, *p;
4360                 bool space;
4361
4362                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4363                         yes_no(link->network->required_for_online));
4364
4365                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4366                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4367                         strempty(link_operstate_to_string(st.min)),
4368                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4369                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4370
4371                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4372
4373                 /************************************************************/
4374
4375                 fputs("DNS=", f);
4376                 space = false;
4377                 if (link->n_dns != (unsigned) -1)
4378                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4379                 else
4380                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4381
4382                 serialize_addresses(f, NULL, &space,
4383                                     NULL,
4384                                     link->dhcp_lease,
4385                                     link->network->dhcp_use_dns,
4386                                     SD_DHCP_LEASE_DNS,
4387                                     link->dhcp6_lease,
4388                                     link->network->dhcp6_use_dns,
4389                                     sd_dhcp6_lease_get_dns,
4390                                     NULL);
4391
4392                 /* Make sure to flush out old entries before we use the NDisc data */
4393                 ndisc_vacuum(link);
4394
4395                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4396                         NDiscRDNSS *dd;
4397
4398                         SET_FOREACH(dd, link->ndisc_rdnss, i)
4399                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4400                 }
4401
4402                 fputc('\n', f);
4403
4404                 /************************************************************/
4405
4406                 serialize_addresses(f, "NTP", NULL,
4407                                     link->ntp ?: link->network->ntp,
4408                                     link->dhcp_lease,
4409                                     link->network->dhcp_use_ntp,
4410                                     SD_DHCP_LEASE_NTP,
4411                                     link->dhcp6_lease,
4412                                     link->network->dhcp6_use_ntp,
4413                                     sd_dhcp6_lease_get_ntp_addrs,
4414                                     sd_dhcp6_lease_get_ntp_fqdn);
4415
4416                 serialize_addresses(f, "SIP", NULL,
4417                                     NULL,
4418                                     link->dhcp_lease,
4419                                     link->network->dhcp_use_sip,
4420                                     SD_DHCP_LEASE_SIP,
4421                                     NULL, false, NULL, NULL);
4422
4423                 /************************************************************/
4424
4425                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4426                         if (link->dhcp_lease) {
4427                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4428                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4429                         }
4430                         if (link->dhcp6_lease)
4431                                 (void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains);
4432                 }
4433
4434                 fputs("DOMAINS=", f);
4435                 space = false;
4436                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4437                         fputs_with_space(f, p, NULL, &space);
4438
4439                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4440                         if (dhcp_domainname)
4441                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4442                         if (dhcp_domains)
4443                                 fputstrv(f, dhcp_domains, NULL, &space);
4444                         if (dhcp6_domains)
4445                                 fputstrv(f, dhcp6_domains, NULL, &space);
4446                 }
4447
4448                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4449                         NDiscDNSSL *dd;
4450
4451                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4452                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4453                 }
4454
4455                 fputc('\n', f);
4456
4457                 /************************************************************/
4458
4459                 fputs("ROUTE_DOMAINS=", f);
4460                 space = false;
4461                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4462                         fputs_with_space(f, p, NULL, &space);
4463
4464                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4465                         if (dhcp_domainname)
4466                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4467                         if (dhcp_domains)
4468                                 fputstrv(f, dhcp_domains, NULL, &space);
4469                         if (dhcp6_domains)
4470                                 fputstrv(f, dhcp6_domains, NULL, &space);
4471                 }
4472
4473                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4474                         NDiscDNSSL *dd;
4475
4476                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4477                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4478                 }
4479
4480                 fputc('\n', f);
4481
4482                 /************************************************************/
4483
4484                 fprintf(f, "LLMNR=%s\n",
4485                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4486
4487                 /************************************************************/
4488
4489                 fprintf(f, "MDNS=%s\n",
4490                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4491
4492                 /************************************************************/
4493
4494                 int dns_default_route =
4495                         link->dns_default_route >= 0 ? link->dns_default_route :
4496                         link->network->dns_default_route;
4497                 if (dns_default_route >= 0)
4498                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4499
4500                 /************************************************************/
4501
4502                 DnsOverTlsMode dns_over_tls_mode =
4503                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4504                         link->network->dns_over_tls_mode;
4505                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4506                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4507
4508                 /************************************************************/
4509
4510                 DnssecMode dnssec_mode =
4511                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4512                         link->network->dnssec_mode;
4513                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4514                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4515
4516                 /************************************************************/
4517
4518                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4519                 if (set_isempty(nta_anchors))
4520                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4521
4522                 if (!set_isempty(nta_anchors)) {
4523                         const char *n;
4524
4525                         fputs("DNSSEC_NTA=", f);
4526                         space = false;
4527                         SET_FOREACH(n, nta_anchors, i)
4528                                 fputs_with_space(f, n, NULL, &space);
4529                         fputc('\n', f);
4530                 }
4531
4532                 /************************************************************/
4533
4534                 fputs("ADDRESSES=", f);
4535                 space = false;
4536                 SET_FOREACH(a, link->addresses, i) {
4537                         _cleanup_free_ char *address_str = NULL;
4538
4539                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4540                         if (r < 0)
4541                                 goto fail;
4542
4543                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4544                         space = true;
4545                 }
4546                 fputc('\n', f);
4547
4548                 /************************************************************/
4549
4550                 fputs("ROUTES=", f);
4551                 space = false;
4552                 SET_FOREACH(route, link->routes, i) {
4553                         _cleanup_free_ char *route_str = NULL;
4554
4555                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4556                         if (r < 0)
4557                                 goto fail;
4558
4559                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4560                                 space ? " " : "", route_str,
4561                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4562                         space = true;
4563                 }
4564
4565                 fputc('\n', f);
4566         }
4567
4568         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4569         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4570
4571         if (link->dhcp_lease) {
4572                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4573                 if (r < 0)
4574                         goto fail;
4575
4576                 fprintf(f,
4577                         "DHCP_LEASE=%s\n",
4578                         link->lease_file);
4579         } else
4580                 (void) unlink(link->lease_file);
4581
4582         if (link->ipv4ll) {
4583                 struct in_addr address;
4584
4585                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4586                 if (r >= 0) {
4587                         fputs("IPV4LL_ADDRESS=", f);
4588                         serialize_in_addrs(f, &address, 1, false, NULL);
4589                         fputc('\n', f);
4590                 }
4591         }
4592
4593         if (link->dhcp6_client) {
4594                 _cleanup_free_ char *duid = NULL;
4595                 uint32_t iaid;
4596
4597                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4598                 if (r >= 0)
4599                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4600
4601                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4602                 if (r >= 0)
4603                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4604         }
4605
4606         r = fflush_and_check(f);
4607         if (r < 0)
4608                 goto fail;
4609
4610         if (rename(temp_path, link->state_file) < 0) {
4611                 r = -errno;
4612                 goto fail;
4613         }
4614
4615         return 0;
4616
4617 fail:
4618         (void) unlink(link->state_file);
4619         if (temp_path)
4620                 (void) unlink(temp_path);
4621
4622         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4623 }
4624
4625 /* The serialized state in /run is no longer up-to-date. */
4626 void link_dirty(Link *link) {
4627         int r;
4628
4629         assert(link);
4630
4631         /* mark manager dirty as link is dirty */
4632         manager_dirty(link->manager);
4633
4634         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4635         if (r <= 0)
4636                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4637                 return;
4638         link_ref(link);
4639 }
4640
4641 /* The serialized state in /run is up-to-date */
4642 void link_clean(Link *link) {
4643         assert(link);
4644         assert(link->manager);
4645
4646         link_unref(set_remove(link->manager->dirty_links, link));
4647 }
4648
4649 int link_save_and_clean(Link *link) {
4650         int r;
4651
4652         r = link_save(link);
4653         if (r < 0)
4654                 return r;
4655
4656         link_clean(link);
4657         return 0;
4658 }
4659
4660 static const char* const link_state_table[_LINK_STATE_MAX] = {
4661         [LINK_STATE_PENDING] = "pending",
4662         [LINK_STATE_INITIALIZED] = "initialized",
4663         [LINK_STATE_CONFIGURING] = "configuring",
4664         [LINK_STATE_CONFIGURED] = "configured",
4665         [LINK_STATE_UNMANAGED] = "unmanaged",
4666         [LINK_STATE_FAILED] = "failed",
4667         [LINK_STATE_LINGER] = "linger",
4668 };
4669
4670 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4671
4672 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4673         const char *err_msg = NULL;
4674
4675         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4676         return log_link_full(link, level, err,
4677                              "%s: %s%s%s%m",
4678                              msg,
4679                              strempty(err_msg),
4680                              err_msg && !endswith(err_msg, ".") ? "." : "",
4681                              err_msg ? " " : "");
4682 }