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 <unistd.h>
   7
   8 #include "alloc-util.h"
   9 #include "bond.h"
  10 #include "bridge.h"
  11 #include "bus-util.h"
  12 #include "dhcp-identifier.h"
  13 #include "dhcp-lease-internal.h"
  14 #include "env-file.h"
  15 #include "ethtool-util.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "ipvlan.h"
  19 #include "missing_network.h"
  20 #include "netlink-util.h"
  21 #include "network-internal.h"
  22 #include "networkd-can.h"
  23 #include "networkd-dhcp-server.h"
  24 #include "networkd-dhcp4.h"
  25 #include "networkd-dhcp6.h"
  26 #include "networkd-ipv4ll.h"
  27 #include "networkd-ipv6-proxy-ndp.h"
  28 #include "networkd-link-bus.h"
  29 #include "networkd-link.h"
  30 #include "networkd-lldp-tx.h"
  31 #include "networkd-manager.h"
  32 #include "networkd-ndisc.h"
  33 #include "networkd-neighbor.h"
  34 #include "networkd-radv.h"
  35 #include "networkd-routing-policy-rule.h"
  36 #include "networkd-wifi.h"
  37 #include "set.h"
  38 #include "socket-util.h"
  39 #include "stat-util.h"
  40 #include "stdio-util.h"
  41 #include "string-table.h"
  42 #include "strv.h"
  43 #include "sysctl-util.h"
  44 #include "tc.h"
  45 #include "tmpfile-util.h"
  46 #include "udev-util.h"
  47 #include "util.h"
  48 #include "vrf.h"
  49
  50 uint32_t link_get_vrf_table(Link *link) {
  51         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  52 }
  53
  54 uint32_t link_get_dhcp_route_table(Link *link) {
  55         /* When the interface is part of an VRF use the VRFs routing table, unless
  56          * another table is explicitly specified. */
  57         if (link->network->dhcp_route_table_set)
  58                 return link->network->dhcp_route_table;
  59         return link_get_vrf_table(link);
  60 }
  61
  62 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  63         if (link->network->ipv6_accept_ra_route_table_set)
  64                 return link->network->ipv6_accept_ra_route_table;
  65         return link_get_vrf_table(link);
  66 }
  67
  68 DUID* link_get_duid(Link *link) {
  69         if (link->network->duid.type != _DUID_TYPE_INVALID)
  70                 return &link->network->duid;
  71         else
  72                 return &link->manager->duid;
  73 }
  74
  75 static bool link_dhcp6_enabled(Link *link) {
  76         assert(link);
  77
  78         if (!socket_ipv6_is_supported())
  79                 return false;
  80
  81         if (link->flags & IFF_LOOPBACK)
  82                 return false;
  83
  84         if (!link->network)
  85                 return false;
  86
  87         if (link->network->bond)
  88                 return false;
  89
  90         if (link->iftype == ARPHRD_CAN)
  91                 return false;
  92
  93         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
  94 }
  95
  96 static bool link_dhcp4_enabled(Link *link) {
  97         assert(link);
  98
  99         if (link->flags & IFF_LOOPBACK)
 100                 return false;
 101
 102         if (!link->network)
 103                 return false;
 104
 105         if (link->network->bond)
 106                 return false;
 107
 108         if (link->iftype == ARPHRD_CAN)
 109                 return false;
 110
 111         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 112 }
 113
 114 static bool link_dhcp4_server_enabled(Link *link) {
 115         assert(link);
 116
 117         if (link->flags & IFF_LOOPBACK)
 118                 return false;
 119
 120         if (!link->network)
 121                 return false;
 122
 123         if (link->network->bond)
 124                 return false;
 125
 126         if (link->iftype == ARPHRD_CAN)
 127                 return false;
 128
 129         return link->network->dhcp_server;
 130 }
 131
 132 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
 133         assert(link);
 134         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 135
 136         if (link->flags & IFF_LOOPBACK)
 137                 return false;
 138
 139         if (!link->network)
 140                 return false;
 141
 142         if (link->iftype == ARPHRD_CAN)
 143                 return false;
 144
 145         if (STRPTR_IN_SET(link->kind,
 146                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
 147                           "vti6", "nlmon", "xfrm"))
 148                 return false;
 149
 150         /* L3 or L3S mode do not support ARP. */
 151         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 152                 return false;
 153
 154         if (link->network->bond)
 155                 return false;
 156
 157         return link->network->link_local & mask;
 158 }
 159
 160 static bool link_ipv6ll_enabled(Link *link) {
 161         assert(link);
 162
 163         if (!socket_ipv6_is_supported())
 164                 return false;
 165
 166         if (link->flags & IFF_LOOPBACK)
 167                 return false;
 168
 169         if (!link->network)
 170                 return false;
 171
 172         if (link->iftype == ARPHRD_CAN)
 173                 return false;
 174
 175         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
 176                 return false;
 177
 178         if (link->network->bond)
 179                 return false;
 180
 181         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 182 }
 183
 184 static bool link_ipv6_enabled(Link *link) {
 185         assert(link);
 186
 187         if (!socket_ipv6_is_supported())
 188                 return false;
 189
 190         if (link->network->bond)
 191                 return false;
 192
 193         if (link->iftype == ARPHRD_CAN)
 194                 return false;
 195
 196         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 197         if (link_ipv6ll_enabled(link))
 198                 return true;
 199
 200         if (network_has_static_ipv6_configurations(link->network))
 201                 return true;
 202
 203         return false;
 204 }
 205
 206 static bool link_radv_enabled(Link *link) {
 207         assert(link);
 208
 209         if (!link_ipv6ll_enabled(link))
 210                 return false;
 211
 212         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 213 }
 214
 215 static bool link_ipv4_forward_enabled(Link *link) {
 216         assert(link);
 217
 218         if (link->flags & IFF_LOOPBACK)
 219                 return false;
 220
 221         if (!link->network)
 222                 return false;
 223
 224         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 225                 return false;
 226
 227         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 228 }
 229
 230 static bool link_ipv6_forward_enabled(Link *link) {
 231         assert(link);
 232
 233         if (!socket_ipv6_is_supported())
 234                 return false;
 235
 236         if (link->flags & IFF_LOOPBACK)
 237                 return false;
 238
 239         if (!link->network)
 240                 return false;
 241
 242         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 243                 return false;
 244
 245         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 246 }
 247
 248 static bool link_proxy_arp_enabled(Link *link) {
 249         assert(link);
 250
 251         if (link->flags & IFF_LOOPBACK)
 252                 return false;
 253
 254         if (!link->network)
 255                 return false;
 256
 257         if (link->network->proxy_arp < 0)
 258                 return false;
 259
 260         return true;
 261 }
 262
 263 static bool link_ipv6_accept_ra_enabled(Link *link) {
 264         assert(link);
 265
 266         if (!socket_ipv6_is_supported())
 267                 return false;
 268
 269         if (link->flags & IFF_LOOPBACK)
 270                 return false;
 271
 272         if (!link->network)
 273                 return false;
 274
 275         if (!link_ipv6ll_enabled(link))
 276                 return false;
 277
 278         /* If unset use system default (enabled if local forwarding is disabled.
 279          * disabled if local forwarding is enabled).
 280          * If set, ignore or enforce RA independent of local forwarding state.
 281          */
 282         if (link->network->ipv6_accept_ra < 0)
 283                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 284                 return !link_ipv6_forward_enabled(link);
 285         else if (link->network->ipv6_accept_ra > 0)
 286                 /* accept RA even if ip_forward is enabled */
 287                 return true;
 288         else
 289                 /* ignore RA */
 290                 return false;
 291 }
 292
 293 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 294         assert(link);
 295
 296         if (!socket_ipv6_is_supported())
 297                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 298
 299         if (link->flags & IFF_LOOPBACK)
 300                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 301
 302         if (!link->network)
 303                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 304
 305         return link->network->ipv6_privacy_extensions;
 306 }
 307
 308 static int link_update_ipv6_sysctl(Link *link) {
 309         bool enabled;
 310         int r;
 311
 312         if (link->flags & IFF_LOOPBACK)
 313                 return 0;
 314
 315         enabled = link_ipv6_enabled(link);
 316         if (enabled) {
 317                 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
 318                 if (r < 0)
 319                         return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
 320
 321                 log_link_info(link, "IPv6 successfully enabled");
 322         }
 323
 324         return 0;
 325 }
 326
 327 static bool link_is_enslaved(Link *link) {
 328         if (link->flags & IFF_SLAVE)
 329                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 330                 return true;
 331
 332         if (!link->network)
 333                 return false;
 334
 335         if (link->master_ifindex > 0 && link->network->bridge)
 336                 return true;
 337
 338         /* TODO: add conditions for other netdevs. */
 339
 340         return false;
 341 }
 342
 343 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 344         Link *master;
 345
 346         if (!netdev)
 347                 return;
 348
 349         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 350                 return;
 351
 352         link_update_operstate(master, true);
 353 }
 354
 355 void link_update_operstate(Link *link, bool also_update_master) {
 356         LinkOperationalState operstate;
 357         LinkCarrierState carrier_state;
 358         LinkAddressState address_state;
 359         _cleanup_strv_free_ char **p = NULL;
 360         uint8_t scope = RT_SCOPE_NOWHERE;
 361         bool changed = false;
 362         Address *address;
 363         Iterator i;
 364
 365         assert(link);
 366
 367         if (link->kernel_operstate == IF_OPER_DORMANT)
 368                 carrier_state = LINK_CARRIER_STATE_DORMANT;
 369         else if (link_has_carrier(link)) {
 370                 if (link_is_enslaved(link))
 371                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
 372                 else
 373                         carrier_state = LINK_CARRIER_STATE_CARRIER;
 374         } else if (link->flags & IFF_UP)
 375                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
 376         else
 377                 carrier_state = LINK_CARRIER_STATE_OFF;
 378
 379         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
 380                 Link *slave;
 381
 382                 SET_FOREACH(slave, link->slaves, i) {
 383                         link_update_operstate(slave, false);
 384
 385                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
 386                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
 387                 }
 388         }
 389
 390         SET_FOREACH(address, link->addresses, i) {
 391                 if (!address_is_ready(address))
 392                         continue;
 393
 394                 if (address->scope < scope)
 395                         scope = address->scope;
 396         }
 397
 398         /* for operstate we also take foreign addresses into account */
 399         SET_FOREACH(address, link->addresses_foreign, i) {
 400                 if (!address_is_ready(address))
 401                         continue;
 402
 403                 if (address->scope < scope)
 404                         scope = address->scope;
 405         }
 406
 407         if (scope < RT_SCOPE_SITE)
 408                 /* universally accessible addresses found */
 409                 address_state = LINK_ADDRESS_STATE_ROUTABLE;
 410         else if (scope < RT_SCOPE_HOST)
 411                 /* only link or site local addresses found */
 412                 address_state = LINK_ADDRESS_STATE_DEGRADED;
 413         else
 414                 /* no useful addresses found */
 415                 address_state = LINK_ADDRESS_STATE_OFF;
 416
 417         /* Mapping of address and carrier state vs operational state
 418          *                                                     carrier state
 419          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 420          *                 ------------------------------------------------------------------------------
 421          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 422          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
 423          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
 424          */
 425
 426         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
 427                 operstate = (LinkOperationalState) carrier_state;
 428         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
 429                 operstate = LINK_OPERSTATE_ROUTABLE;
 430         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
 431                 operstate = LINK_OPERSTATE_DEGRADED;
 432         else
 433                 operstate = LINK_OPERSTATE_ENSLAVED;
 434
 435         if (link->carrier_state != carrier_state) {
 436                 link->carrier_state = carrier_state;
 437                 changed = true;
 438                 if (strv_extend(&p, "CarrierState") < 0)
 439                         log_oom();
 440         }
 441
 442         if (link->address_state != address_state) {
 443                 link->address_state = address_state;
 444                 changed = true;
 445                 if (strv_extend(&p, "AddressState") < 0)
 446                         log_oom();
 447         }
 448
 449         if (link->operstate != operstate) {
 450                 link->operstate = operstate;
 451                 changed = true;
 452                 if (strv_extend(&p, "OperationalState") < 0)
 453                         log_oom();
 454         }
 455
 456         if (p)
 457                 link_send_changed_strv(link, p);
 458         if (changed)
 459                 link_dirty(link);
 460
 461         if (also_update_master && link->network) {
 462                 link_update_master_operstate(link, link->network->bond);
 463                 link_update_master_operstate(link, link->network->bridge);
 464         }
 465 }
 466
 467 #define FLAG_STRING(string, flag, old, new) \
 468         (((old ^ new) & flag) \
 469                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 470                 : "")
 471
 472 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 473         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 474         uint8_t operstate;
 475         int r;
 476
 477         assert(link);
 478
 479         r = sd_rtnl_message_link_get_flags(m, &flags);
 480         if (r < 0)
 481                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 482
 483         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 484         if (r < 0)
 485                 /* if we got a message without operstate, take it to mean
 486                    the state was unchanged */
 487                 operstate = link->kernel_operstate;
 488
 489         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 490                 return 0;
 491
 492         if (link->flags != flags) {
 493                 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",
 494                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 495                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 496                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 497                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 498                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 499                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 500                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 501                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 502                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 503                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 504                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 505                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 506                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 507                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 508                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 509                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 510                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 511                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 512                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 513
 514                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 515                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 516                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 517                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 518                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 519                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 520                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 521                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 522
 523                 /* link flags are currently at most 18 bits, let's align to
 524                  * printing 20 */
 525                 if (unknown_flags_added)
 526                         log_link_debug(link,
 527                                        "Unknown link flags gained: %#.5x (ignoring)",
 528                                        unknown_flags_added);
 529
 530                 if (unknown_flags_removed)
 531                         log_link_debug(link,
 532                                        "Unknown link flags lost: %#.5x (ignoring)",
 533                                        unknown_flags_removed);
 534         }
 535
 536         link->flags = flags;
 537         link->kernel_operstate = operstate;
 538
 539         link_update_operstate(link, true);
 540
 541         return 0;
 542 }
 543
 544 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 545         _cleanup_(link_unrefp) Link *link = NULL;
 546         const char *ifname, *kind = NULL;
 547         unsigned short iftype;
 548         int r, ifindex;
 549         uint16_t type;
 550
 551         assert(manager);
 552         assert(message);
 553         assert(ret);
 554
 555         /* check for link kind */
 556         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 557         if (r == 0) {
 558                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 559                 r = sd_netlink_message_exit_container(message);
 560                 if (r < 0)
 561                         return r;
 562         }
 563
 564         r = sd_netlink_message_get_type(message, &type);
 565         if (r < 0)
 566                 return r;
 567         else if (type != RTM_NEWLINK)
 568                 return -EINVAL;
 569
 570         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 571         if (r < 0)
 572                 return r;
 573         else if (ifindex <= 0)
 574                 return -EINVAL;
 575
 576         r = sd_rtnl_message_link_get_type(message, &iftype);
 577         if (r < 0)
 578                 return r;
 579
 580         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 581         if (r < 0)
 582                 return r;
 583
 584         link = new(Link, 1);
 585         if (!link)
 586                 return -ENOMEM;
 587
 588         *link = (Link) {
 589                 .n_ref = 1,
 590                 .manager = manager,
 591                 .state = LINK_STATE_PENDING,
 592                 .ifindex = ifindex,
 593                 .iftype = iftype,
 594
 595                 .n_dns = (unsigned) -1,
 596                 .dns_default_route = -1,
 597                 .llmnr = _RESOLVE_SUPPORT_INVALID,
 598                 .mdns = _RESOLVE_SUPPORT_INVALID,
 599                 .dnssec_mode = _DNSSEC_MODE_INVALID,
 600                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
 601         };
 602
 603         link->ifname = strdup(ifname);
 604         if (!link->ifname)
 605                 return -ENOMEM;
 606
 607         if (kind) {
 608                 link->kind = strdup(kind);
 609                 if (!link->kind)
 610                         return -ENOMEM;
 611         }
 612
 613         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 614         if (r < 0)
 615                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 616
 617         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 618         if (r < 0)
 619                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 620
 621         r = ethtool_get_permanent_macaddr(NULL, link->ifname, &link->permanent_mac);
 622         if (r < 0)
 623                 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
 624
 625         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
 626         if (r < 0 && r != -ENODATA)
 627                 return r;
 628
 629         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 630                 return -ENOMEM;
 631
 632         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 633                 return -ENOMEM;
 634
 635         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 636                 return -ENOMEM;
 637
 638         r = hashmap_ensure_allocated(&manager->links, NULL);
 639         if (r < 0)
 640                 return r;
 641
 642         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 643         if (r < 0)
 644                 return r;
 645
 646         r = link_update_flags(link, message, false);
 647         if (r < 0)
 648                 return r;
 649
 650         *ret = TAKE_PTR(link);
 651
 652         return 0;
 653 }
 654
 655 void link_ntp_settings_clear(Link *link) {
 656         link->ntp = strv_free(link->ntp);
 657 }
 658
 659 void link_dns_settings_clear(Link *link) {
 660         link->dns = mfree(link->dns);
 661         link->n_dns = (unsigned) -1;
 662
 663         link->search_domains = ordered_set_free_free(link->search_domains);
 664         link->route_domains = ordered_set_free_free(link->route_domains);
 665
 666         link->dns_default_route = -1;
 667         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 668         link->mdns = _RESOLVE_SUPPORT_INVALID;
 669         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 670         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 671
 672         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 673 }
 674
 675 static void link_free_engines(Link *link) {
 676         if (!link)
 677                 return;
 678
 679         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 680         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 681         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 682         link->dhcp_routes = set_free(link->dhcp_routes);
 683
 684         link->lldp = sd_lldp_unref(link->lldp);
 685
 686         ndisc_flush(link);
 687
 688         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 689         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 690         link->ndisc = sd_ndisc_unref(link->ndisc);
 691         link->radv = sd_radv_unref(link->radv);
 692 }
 693
 694 static Link *link_free(Link *link) {
 695         Address *address;
 696
 697         assert(link);
 698
 699         link_ntp_settings_clear(link);
 700         link_dns_settings_clear(link);
 701
 702         link->routes = set_free_with_destructor(link->routes, route_free);
 703         link->routes_foreign = set_free_with_destructor(link->routes_foreign, route_free);
 704
 705         link->nexthops = set_free_with_destructor(link->nexthops, nexthop_free);
 706         link->nexthops_foreign = set_free_with_destructor(link->nexthops_foreign, nexthop_free);
 707
 708         link->neighbors = set_free_with_destructor(link->neighbors, neighbor_free);
 709         link->neighbors_foreign = set_free_with_destructor(link->neighbors_foreign, neighbor_free);
 710
 711         link->addresses = set_free_with_destructor(link->addresses, address_free);
 712         link->addresses_foreign = set_free_with_destructor(link->addresses_foreign, address_free);
 713
 714         while ((address = link->pool_addresses)) {
 715                 LIST_REMOVE(addresses, link->pool_addresses, address);
 716                 address_free(address);
 717         }
 718
 719         link_lldp_emit_stop(link);
 720         link_free_engines(link);
 721         free(link->lease_file);
 722         free(link->lldp_file);
 723
 724         free(link->ifname);
 725         strv_free(link->alternative_names);
 726         free(link->kind);
 727         free(link->ssid);
 728
 729         (void) unlink(link->state_file);
 730         free(link->state_file);
 731
 732         sd_device_unref(link->sd_device);
 733
 734         hashmap_free(link->bound_to_links);
 735         hashmap_free(link->bound_by_links);
 736
 737         set_free_with_destructor(link->slaves, link_unref);
 738
 739         network_unref(link->network);
 740
 741         return mfree(link);
 742 }
 743
 744 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 745
 746 int link_get(Manager *m, int ifindex, Link **ret) {
 747         Link *link;
 748
 749         assert(m);
 750         assert(ifindex);
 751         assert(ret);
 752
 753         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 754         if (!link)
 755                 return -ENODEV;
 756
 757         *ret = link;
 758
 759         return 0;
 760 }
 761
 762 void link_set_state(Link *link, LinkState state) {
 763         assert(link);
 764
 765         if (link->state == state)
 766                 return;
 767
 768         log_link_debug(link, "State changed: %s -> %s",
 769                        link_state_to_string(link->state),
 770                        link_state_to_string(state));
 771
 772         link->state = state;
 773
 774         link_send_changed(link, "AdministrativeState", NULL);
 775 }
 776
 777 static void link_enter_unmanaged(Link *link) {
 778         assert(link);
 779
 780         link_set_state(link, LINK_STATE_UNMANAGED);
 781
 782         link_dirty(link);
 783 }
 784
 785 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 786         int r = 0, k;
 787         Address *ad;
 788
 789         assert(link);
 790         assert(link->manager);
 791         assert(link->manager->event);
 792
 793         dhcp4_release_old_lease(link);
 794
 795         bool keep_dhcp = may_keep_dhcp &&
 796                          link->network &&
 797                          (link->manager->restarting ||
 798                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 799
 800         if (link->dhcp_client && !keep_dhcp) {
 801                 k = sd_dhcp_client_stop(link->dhcp_client);
 802                 if (k < 0)
 803                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 804         }
 805
 806         if (link->ipv4ll) {
 807                 k = sd_ipv4ll_stop(link->ipv4ll);
 808                 if (k < 0)
 809                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 810         }
 811
 812         if (link->network)
 813                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 814                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 815                                 k = sd_ipv4acd_stop(ad->acd);
 816                                 if (k < 0)
 817                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 818                         }
 819
 820         if (link->dhcp6_client) {
 821                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 822                 if (k < 0)
 823                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 824         }
 825
 826         if (link->ndisc) {
 827                 k = sd_ndisc_stop(link->ndisc);
 828                 if (k < 0)
 829                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 830         }
 831
 832         if (link->radv) {
 833                 k = sd_radv_stop(link->radv);
 834                 if (k < 0)
 835                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 836         }
 837
 838         link_lldp_emit_stop(link);
 839         return r;
 840 }
 841
 842 void link_enter_failed(Link *link) {
 843         assert(link);
 844
 845         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 846                 return;
 847
 848         log_link_warning(link, "Failed");
 849
 850         link_set_state(link, LINK_STATE_FAILED);
 851
 852         link_stop_clients(link, false);
 853
 854         link_dirty(link);
 855 }
 856
 857 static int link_join_netdevs_after_configured(Link *link) {
 858         NetDev *netdev;
 859         Iterator i;
 860         int r;
 861
 862         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
 863                 if (netdev->ifindex > 0)
 864                         /* Assume already enslaved. */
 865                         continue;
 866
 867                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 868                         continue;
 869
 870                 log_struct(LOG_DEBUG,
 871                            LOG_LINK_INTERFACE(link),
 872                            LOG_NETDEV_INTERFACE(netdev),
 873                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 874
 875                 r = netdev_join(netdev, link, NULL);
 876                 if (r < 0)
 877                         return log_struct_errno(LOG_WARNING, r,
 878                                                 LOG_LINK_INTERFACE(link),
 879                                                 LOG_NETDEV_INTERFACE(netdev),
 880                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 881         }
 882
 883         return 0;
 884 }
 885
 886 static void link_enter_configured(Link *link) {
 887         assert(link);
 888         assert(link->network);
 889
 890         if (link->state != LINK_STATE_CONFIGURING)
 891                 return;
 892
 893         link_set_state(link, LINK_STATE_CONFIGURED);
 894
 895         (void) link_join_netdevs_after_configured(link);
 896
 897         link_dirty(link);
 898 }
 899
 900 static int link_request_set_routing_policy_rule(Link *link) {
 901         RoutingPolicyRule *rule, *rrule = NULL;
 902         int r;
 903
 904         assert(link);
 905         assert(link->network);
 906
 907         link->routing_policy_rules_configured = false;
 908
 909         LIST_FOREACH(rules, rule, link->network->rules) {
 910                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 911                 if (r >= 0) {
 912                         if (r == 0)
 913                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 914                         continue;
 915                 }
 916
 917                 r = routing_policy_rule_configure(rule, link, NULL);
 918                 if (r < 0)
 919                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 920                 if (r > 0)
 921                         link->routing_policy_rule_messages++;
 922         }
 923
 924         routing_policy_rule_purge(link->manager, link);
 925         if (link->routing_policy_rule_messages == 0) {
 926                 link->routing_policy_rules_configured = true;
 927                 link_check_ready(link);
 928         } else {
 929                 log_link_debug(link, "Setting routing policy rules");
 930                 link_set_state(link, LINK_STATE_CONFIGURING);
 931         }
 932
 933         return 0;
 934 }
 935
 936 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 937         int r;
 938
 939         assert(link);
 940         assert(link->nexthop_messages > 0);
 941         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 942                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 943
 944         link->nexthop_messages--;
 945
 946         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 947                 return 1;
 948
 949         r = sd_netlink_message_get_errno(m);
 950         if (r < 0 && r != -EEXIST) {
 951                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 952                 link_enter_failed(link);
 953                 return 1;
 954         }
 955
 956         if (link->nexthop_messages == 0) {
 957                 log_link_debug(link, "Nexthop set");
 958                 link->static_nexthops_configured = true;
 959                 link_check_ready(link);
 960         }
 961
 962         return 1;
 963 }
 964
 965 int link_request_set_nexthop(Link *link) {
 966         NextHop *nh;
 967         int r;
 968
 969         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 970                 r = nexthop_configure(nh, link, nexthop_handler);
 971                 if (r < 0)
 972                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
 973                 if (r > 0)
 974                         link->nexthop_messages++;
 975         }
 976
 977         if (link->nexthop_messages == 0) {
 978                 link->static_nexthops_configured = true;
 979                 link_check_ready(link);
 980         } else {
 981                 log_link_debug(link, "Setting nexthop");
 982                 link_set_state(link, LINK_STATE_CONFIGURING);
 983         }
 984
 985         return 1;
 986 }
 987
 988 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 989         int r;
 990
 991         assert(link);
 992         assert(link->route_messages > 0);
 993         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 994                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 995
 996         link->route_messages--;
 997
 998         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 999                 return 1;
1000
1001         r = sd_netlink_message_get_errno(m);
1002         if (r < 0 && r != -EEXIST) {
1003                 log_link_message_warning_errno(link, m, r, "Could not set route");
1004                 link_enter_failed(link);
1005                 return 1;
1006         }
1007
1008         if (link->route_messages == 0) {
1009                 log_link_debug(link, "Routes set");
1010                 link->static_routes_configured = true;
1011                 link_check_ready(link);
1012         }
1013
1014         return 1;
1015 }
1016
1017 int link_request_set_routes(Link *link) {
1018         enum {
1019                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1020                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1021                 _PHASE_MAX
1022         } phase;
1023         Route *rt;
1024         int r;
1025
1026         assert(link);
1027         assert(link->network);
1028         assert(link->addresses_configured);
1029         assert(link->address_messages == 0);
1030         assert(link->state != _LINK_STATE_INVALID);
1031
1032         link->static_routes_configured = false;
1033         link->static_routes_ready = false;
1034
1035         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1036                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1037                  * the addresses now, let's not configure the routes either. */
1038                 return 0;
1039
1040         r = link_request_set_routing_policy_rule(link);
1041         if (r < 0)
1042                 return r;
1043
1044         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1045         for (phase = 0; phase < _PHASE_MAX; phase++)
1046                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1047                         if (rt->gateway_from_dhcp)
1048                                 continue;
1049
1050                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1051                                 continue;
1052
1053                         r = route_configure(rt, link, route_handler);
1054                         if (r < 0)
1055                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1056                         if (r > 0)
1057                                 link->route_messages++;
1058                 }
1059
1060         if (link->route_messages == 0) {
1061                 link->static_routes_configured = true;
1062                 link_check_ready(link);
1063         } else {
1064                 log_link_debug(link, "Setting routes");
1065                 link_set_state(link, LINK_STATE_CONFIGURING);
1066         }
1067
1068         return 0;
1069 }
1070
1071 void link_check_ready(Link *link) {
1072         Address *a;
1073         Iterator i;
1074         int r;
1075
1076         assert(link);
1077
1078         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1079                 return;
1080
1081         if (!link->network)
1082                 return;
1083
1084         if (!link->addresses_configured)
1085                 return;
1086
1087         if (!link->neighbors_configured)
1088                 return;
1089
1090         SET_FOREACH(a, link->addresses, i)
1091                 if (!address_is_ready(a))
1092                         return;
1093
1094         if (!link->addresses_ready) {
1095                 link->addresses_ready = true;
1096                 r = link_request_set_routes(link);
1097                 if (r < 0)
1098                         link_enter_failed(link);
1099                 return;
1100         }
1101
1102         if (!link->static_routes_configured)
1103                 return;
1104
1105         if (!link->static_routes_ready) {
1106                 link->static_routes_ready = true;
1107                 r = link_request_set_nexthop(link);
1108                 if (r < 0)
1109                         link_enter_failed(link);
1110                 return;
1111         }
1112
1113         if (!link->static_nexthops_configured)
1114                 return;
1115
1116         if (!link->routing_policy_rules_configured)
1117                 return;
1118
1119         if (!link->tc_configured)
1120                 return;
1121
1122         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1123
1124                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address)
1125                         return;
1126
1127                 if (link_ipv6ll_enabled(link) &&
1128                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address))
1129                         return;
1130
1131                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1132                     !link->dhcp4_configured &&
1133                     !link->dhcp6_configured &&
1134                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address))
1135                         /* When DHCP is enabled, at least one protocol must provide an address, or
1136                          * an IPv4ll fallback address must be configured. */
1137                         return;
1138
1139                 if (link_ipv6_accept_ra_enabled(link) && !link->ndisc_configured)
1140                         return;
1141         }
1142
1143         if (link->state != LINK_STATE_CONFIGURED)
1144                 link_enter_configured(link);
1145
1146         return;
1147 }
1148
1149 static int link_request_set_neighbors(Link *link) {
1150         Neighbor *neighbor;
1151         int r;
1152
1153         assert(link);
1154         assert(link->network);
1155         assert(link->state != _LINK_STATE_INVALID);
1156
1157         link->neighbors_configured = false;
1158
1159         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1160                 r = neighbor_configure(neighbor, link, NULL);
1161                 if (r < 0)
1162                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1163         }
1164
1165         if (link->neighbor_messages == 0) {
1166                 link->neighbors_configured = true;
1167                 link_check_ready(link);
1168         } else {
1169                 log_link_debug(link, "Setting neighbors");
1170                 link_set_state(link, LINK_STATE_CONFIGURING);
1171         }
1172
1173         return 0;
1174 }
1175
1176 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1177         int r;
1178
1179         assert(rtnl);
1180         assert(m);
1181         assert(link);
1182         assert(link->ifname);
1183         assert(link->address_messages > 0);
1184         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1185                LINK_STATE_FAILED, LINK_STATE_LINGER));
1186
1187         link->address_messages--;
1188
1189         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1190                 return 1;
1191
1192         r = sd_netlink_message_get_errno(m);
1193         if (r < 0 && r != -EEXIST) {
1194                 log_link_message_warning_errno(link, m, r, "Could not set address");
1195                 link_enter_failed(link);
1196                 return 1;
1197         } else if (r >= 0)
1198                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1199
1200         if (link->address_messages == 0) {
1201                 log_link_debug(link, "Addresses set");
1202                 link->addresses_configured = true;
1203                 link_check_ready(link);
1204         }
1205
1206         return 1;
1207 }
1208
1209 static int link_set_bridge_fdb(Link *link) {
1210         FdbEntry *fdb_entry;
1211         int r;
1212
1213         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1214                 r = fdb_entry_configure(link, fdb_entry);
1215                 if (r < 0)
1216                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1217         }
1218
1219         return 0;
1220 }
1221
1222 static int link_request_set_addresses(Link *link) {
1223         AddressLabel *label;
1224         Address *ad;
1225         Prefix *p;
1226         int r;
1227
1228         assert(link);
1229         assert(link->network);
1230         assert(link->state != _LINK_STATE_INVALID);
1231
1232         /* Reset all *_configured flags we are configuring. */
1233         link->addresses_configured = false;
1234         link->addresses_ready = false;
1235         link->neighbors_configured = false;
1236         link->static_routes_configured = false;
1237         link->static_routes_ready = false;
1238         link->static_nexthops_configured = false;
1239         link->routing_policy_rules_configured = false;
1240
1241         r = link_set_bridge_fdb(link);
1242         if (r < 0)
1243                 return r;
1244
1245         r = link_request_set_neighbors(link);
1246         if (r < 0)
1247                 return r;
1248
1249         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1250                 bool update;
1251
1252                 update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1253
1254                 r = address_configure(ad, link, address_handler, update);
1255                 if (r < 0)
1256                         return log_link_warning_errno(link, r, "Could not set addresses: %m");
1257                 if (r > 0)
1258                         link->address_messages++;
1259         }
1260
1261         if (IN_SET(link->network->router_prefix_delegation,
1262                    RADV_PREFIX_DELEGATION_STATIC,
1263                    RADV_PREFIX_DELEGATION_BOTH))
1264                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1265                         _cleanup_(address_freep) Address *address = NULL;
1266
1267                         if (!p->assign)
1268                                 continue;
1269
1270                         r = address_new(&address);
1271                         if (r < 0)
1272                                 return log_link_error_errno(link, r, "Could not allocate address: %m");
1273
1274                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1275                         if (r < 0)
1276                                 return r;
1277
1278                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1279                         if (r < 0)
1280                                 return r;
1281
1282                         address->family = AF_INET6;
1283                         r = address_configure(address, link, address_handler, true);
1284                         if (r < 0)
1285                                 return log_link_warning_errno(link, r, "Could not set addresses: %m");
1286                         if (r > 0)
1287                                 link->address_messages++;
1288                 }
1289
1290         LIST_FOREACH(labels, label, link->network->address_labels) {
1291                 r = address_label_configure(label, link, NULL, false);
1292                 if (r < 0)
1293                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1294
1295                 link->address_label_messages++;
1296         }
1297
1298         /* now that we can figure out a default address for the dhcp server,
1299            start it */
1300         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1301                 r = dhcp4_server_configure(link);
1302                 if (r < 0)
1303                         return r;
1304                 log_link_debug(link, "Offering DHCPv4 leases");
1305         }
1306
1307         if (link->address_messages == 0) {
1308                 link->addresses_configured = true;
1309                 link_check_ready(link);
1310         } else {
1311                 log_link_debug(link, "Setting addresses");
1312                 link_set_state(link, LINK_STATE_CONFIGURING);
1313         }
1314
1315         return 0;
1316 }
1317
1318 static int link_set_bridge_vlan(Link *link) {
1319         int r;
1320
1321         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1322         if (r < 0)
1323                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1324
1325         return r;
1326 }
1327
1328 static int link_set_proxy_arp(Link *link) {
1329         int r;
1330
1331         if (!link_proxy_arp_enabled(link))
1332                 return 0;
1333
1334         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1335         if (r < 0)
1336                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1337
1338         return 0;
1339 }
1340
1341 static int link_configure_continue(Link *link);
1342
1343 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1344         int r;
1345
1346         assert(m);
1347         assert(link);
1348         assert(link->ifname);
1349
1350         link->setting_mtu = false;
1351
1352         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1353                 return 1;
1354
1355         r = sd_netlink_message_get_errno(m);
1356         if (r < 0)
1357                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1358         else
1359                 log_link_debug(link, "Setting MTU done.");
1360
1361         if (link->state == LINK_STATE_INITIALIZED) {
1362                 r = link_configure_continue(link);
1363                 if (r < 0)
1364                         link_enter_failed(link);
1365         }
1366
1367         return 1;
1368 }
1369
1370 int link_set_mtu(Link *link, uint32_t mtu) {
1371         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1372         int r;
1373
1374         assert(link);
1375         assert(link->manager);
1376         assert(link->manager->rtnl);
1377
1378         if (mtu == 0 || link->setting_mtu)
1379                 return 0;
1380
1381         if (link->mtu == mtu)
1382                 return 0;
1383
1384         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1385
1386         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1387         if (r < 0)
1388                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1389
1390         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1391          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1392         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1393
1394                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1395                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1396
1397                 mtu = IPV6_MIN_MTU;
1398         }
1399
1400         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1401         if (r < 0)
1402                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1403
1404         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1405                                link_netlink_destroy_callback, link);
1406         if (r < 0)
1407                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1408
1409         link_ref(link);
1410         link->setting_mtu = true;
1411
1412         return 0;
1413 }
1414
1415 static bool link_reduces_vlan_mtu(Link *link) {
1416         /* See netif_reduces_vlan_mtu() in kernel. */
1417         return streq_ptr(link->kind, "macsec");
1418 }
1419
1420 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1421         uint32_t mtu = 0;
1422         NetDev *dev;
1423         Iterator i;
1424
1425         HASHMAP_FOREACH(dev, link->network->stacked_netdevs, i)
1426                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1427                         /* See vlan_dev_change_mtu() in kernel. */
1428                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1429
1430                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1431                         /* See macvlan_change_mtu() in kernel. */
1432                         mtu = dev->mtu;
1433
1434         return mtu;
1435 }
1436
1437 static int link_configure_mtu(Link *link) {
1438         uint32_t mtu;
1439
1440         assert(link);
1441         assert(link->network);
1442
1443         if (link->network->mtu > 0)
1444                 return link_set_mtu(link, link->network->mtu);
1445
1446         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1447         if (link->mtu >= mtu)
1448                 return 0;
1449
1450         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1451                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1452                         link->mtu, mtu);
1453
1454         return link_set_mtu(link, mtu);
1455 }
1456
1457 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1458         int r;
1459
1460         assert(m);
1461         assert(link);
1462         assert(link->ifname);
1463
1464         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1465                 return 1;
1466
1467         r = sd_netlink_message_get_errno(m);
1468         if (r < 0)
1469                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1470
1471         return 1;
1472 }
1473
1474 static int link_set_flags(Link *link) {
1475         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1476         unsigned ifi_change = 0;
1477         unsigned ifi_flags = 0;
1478         int r;
1479
1480         assert(link);
1481         assert(link->manager);
1482         assert(link->manager->rtnl);
1483
1484         if (link->flags & IFF_LOOPBACK)
1485                 return 0;
1486
1487         if (!link->network)
1488                 return 0;
1489
1490         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1491                 return 0;
1492
1493         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1494         if (r < 0)
1495                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1496
1497         if (link->network->arp >= 0) {
1498                 ifi_change |= IFF_NOARP;
1499                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1500         }
1501
1502         if (link->network->multicast >= 0) {
1503                 ifi_change |= IFF_MULTICAST;
1504                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1505         }
1506
1507         if (link->network->allmulticast >= 0) {
1508                 ifi_change |= IFF_ALLMULTI;
1509                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1510         }
1511
1512         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1513         if (r < 0)
1514                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1515
1516         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1517                                link_netlink_destroy_callback, link);
1518         if (r < 0)
1519                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1520
1521         link_ref(link);
1522
1523         return 0;
1524 }
1525
1526 static int link_acquire_ipv6_conf(Link *link) {
1527         int r;
1528
1529         assert(link);
1530
1531         if (link_ipv6_accept_ra_enabled(link)) {
1532                 assert(link->ndisc);
1533
1534                 log_link_debug(link, "Discovering IPv6 routers");
1535
1536                 r = sd_ndisc_start(link->ndisc);
1537                 if (r < 0 && r != -EBUSY)
1538                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1539         }
1540
1541         if (link_radv_enabled(link)) {
1542                 assert(link->radv);
1543                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1544
1545                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1546
1547                 r = radv_emit_dns(link);
1548                 if (r < 0)
1549                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1550
1551                 r = sd_radv_start(link->radv);
1552                 if (r < 0 && r != -EBUSY)
1553                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1554         }
1555
1556         if (link_dhcp6_enabled(link) && link->network->dhcp6_without_ra) {
1557                 assert(link->dhcp6_client);
1558                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1559
1560                 r = dhcp6_request_address(link, true);
1561                 if (r < 0 && r != -EBUSY)
1562                         return log_link_warning_errno(link, r,  "Could not acquire DHCPv6 lease: %m");
1563                 else
1564                         log_link_debug(link, "Acquiring DHCPv6 lease");
1565         }
1566
1567         (void) dhcp6_request_prefix_delegation(link);
1568
1569         return 0;
1570 }
1571
1572 static int link_acquire_ipv4_conf(Link *link) {
1573         int r;
1574
1575         assert(link);
1576         assert(link->manager);
1577         assert(link->manager->event);
1578
1579         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1580                 assert(link->ipv4ll);
1581
1582                 log_link_debug(link, "Acquiring IPv4 link-local address");
1583
1584                 r = sd_ipv4ll_start(link->ipv4ll);
1585                 if (r < 0)
1586                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1587         }
1588
1589         if (link_dhcp4_enabled(link)) {
1590                 assert(link->dhcp_client);
1591
1592                 log_link_debug(link, "Acquiring DHCPv4 lease");
1593
1594                 r = sd_dhcp_client_start(link->dhcp_client);
1595                 if (r < 0)
1596                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1597         }
1598
1599         return 0;
1600 }
1601
1602 static int link_acquire_conf(Link *link) {
1603         int r;
1604
1605         assert(link);
1606
1607         r = link_acquire_ipv4_conf(link);
1608         if (r < 0)
1609                 return r;
1610
1611         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1612                 r = link_acquire_ipv6_conf(link);
1613                 if (r < 0)
1614                         return r;
1615         }
1616
1617         if (link_lldp_emit_enabled(link)) {
1618                 r = link_lldp_emit_start(link);
1619                 if (r < 0)
1620                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1621         }
1622
1623         return 0;
1624 }
1625
1626 bool link_has_carrier(Link *link) {
1627         /* see Documentation/networking/operstates.txt in the kernel sources */
1628
1629         if (link->kernel_operstate == IF_OPER_UP)
1630                 return true;
1631
1632         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1633                 /* operstate may not be implemented, so fall back to flags */
1634                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1635                     !FLAGS_SET(link->flags, IFF_DORMANT))
1636                         return true;
1637
1638         return false;
1639 }
1640
1641 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1642         int r;
1643
1644         assert(link);
1645
1646         link->setting_genmode = false;
1647
1648         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1649                 return 1;
1650
1651         r = sd_netlink_message_get_errno(m);
1652         if (r < 0)
1653                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1654         else
1655                 log_link_debug(link, "Setting address genmode done.");
1656
1657         if (link->state == LINK_STATE_INITIALIZED) {
1658                 r = link_configure_continue(link);
1659                 if (r < 0)
1660                         link_enter_failed(link);
1661         }
1662
1663         return 1;
1664 }
1665
1666 static int link_configure_addrgen_mode(Link *link) {
1667         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1668         uint8_t ipv6ll_mode;
1669         int r;
1670
1671         assert(link);
1672         assert(link->network);
1673         assert(link->manager);
1674         assert(link->manager->rtnl);
1675
1676         if (!socket_ipv6_is_supported() || link->setting_genmode)
1677                 return 0;
1678
1679         log_link_debug(link, "Setting address genmode for link");
1680
1681         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1682         if (r < 0)
1683                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1684
1685         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1686         if (r < 0)
1687                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1688
1689         r = sd_netlink_message_open_container(req, AF_INET6);
1690         if (r < 0)
1691                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1692
1693         if (!link_ipv6ll_enabled(link))
1694                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1695         else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0)
1696                 /* The file may not exist. And even if it exists, when stable_secret is unset,
1697                  * reading the file fails with EIO. */
1698                 ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1699         else
1700                 ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1701
1702         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1703         if (r < 0)
1704                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1705
1706         r = sd_netlink_message_close_container(req);
1707         if (r < 0)
1708                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1709
1710         r = sd_netlink_message_close_container(req);
1711         if (r < 0)
1712                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1713
1714         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1715                                link_netlink_destroy_callback, link);
1716         if (r < 0)
1717                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1718
1719         link_ref(link);
1720         link->setting_genmode = true;
1721
1722         return 0;
1723 }
1724
1725 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1726         int r;
1727
1728         assert(link);
1729
1730         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1731                 return 1;
1732
1733         r = sd_netlink_message_get_errno(m);
1734         if (r < 0)
1735                 /* we warn but don't fail the link, as it may be brought up later */
1736                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1737
1738         return 1;
1739 }
1740
1741 static int link_up(Link *link) {
1742         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1743         int r;
1744
1745         assert(link);
1746         assert(link->network);
1747         assert(link->manager);
1748         assert(link->manager->rtnl);
1749
1750         log_link_debug(link, "Bringing link up");
1751
1752         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1753         if (r < 0)
1754                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1755
1756         /* set it free if not enslaved with networkd */
1757         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1758                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1759                 if (r < 0)
1760                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1761         }
1762
1763         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1764         if (r < 0)
1765                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1766
1767         if (link->network->mac) {
1768                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1769                 if (r < 0)
1770                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1771         }
1772
1773         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1774                                link_netlink_destroy_callback, link);
1775         if (r < 0)
1776                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1777
1778         link_ref(link);
1779
1780         return 0;
1781 }
1782
1783 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1784         int r;
1785
1786         assert(link);
1787
1788         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1789                 return 1;
1790
1791         r = sd_netlink_message_get_errno(m);
1792         if (r < 0)
1793                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1794
1795         return 1;
1796 }
1797
1798 int link_down(Link *link, link_netlink_message_handler_t callback) {
1799         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1800         int r;
1801
1802         assert(link);
1803         assert(link->manager);
1804         assert(link->manager->rtnl);
1805
1806         log_link_debug(link, "Bringing link down");
1807
1808         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1809                                      RTM_SETLINK, link->ifindex);
1810         if (r < 0)
1811                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1812
1813         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1814         if (r < 0)
1815                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1816
1817         r = netlink_call_async(link->manager->rtnl, NULL, req,
1818                                callback ?: link_down_handler,
1819                                link_netlink_destroy_callback, link);
1820         if (r < 0)
1821                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1822
1823         link_ref(link);
1824
1825         return 0;
1826 }
1827
1828 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1829         int r;
1830
1831         assert(link);
1832
1833         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1834                 return 1;
1835
1836         r = sd_netlink_message_get_errno(m);
1837         if (r < 0)
1838                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1839
1840         return 1;
1841 }
1842
1843 static int link_set_group(Link *link) {
1844         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1845         int r;
1846
1847         assert(link);
1848         assert(link->network);
1849         assert(link->manager);
1850         assert(link->manager->rtnl);
1851
1852         if (link->network->group <= 0)
1853                 return 0;
1854
1855         log_link_debug(link, "Setting group");
1856
1857         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1858         if (r < 0)
1859                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1860
1861         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
1862         if (r < 0)
1863                 return log_link_error_errno(link, r, "Could not set link group: %m");
1864
1865         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_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
1872         return 0;
1873 }
1874
1875 static int link_handle_bound_to_list(Link *link) {
1876         Link *l;
1877         Iterator i;
1878         int r;
1879         bool required_up = false;
1880         bool link_is_up = false;
1881
1882         assert(link);
1883
1884         if (hashmap_isempty(link->bound_to_links))
1885                 return 0;
1886
1887         if (link->flags & IFF_UP)
1888                 link_is_up = true;
1889
1890         HASHMAP_FOREACH (l, link->bound_to_links, i)
1891                 if (link_has_carrier(l)) {
1892                         required_up = true;
1893                         break;
1894                 }
1895
1896         if (!required_up && link_is_up) {
1897                 r = link_down(link, NULL);
1898                 if (r < 0)
1899                         return r;
1900         } else if (required_up && !link_is_up) {
1901                 r = link_up(link);
1902                 if (r < 0)
1903                         return r;
1904         }
1905
1906         return 0;
1907 }
1908
1909 static int link_handle_bound_by_list(Link *link) {
1910         Iterator i;
1911         Link *l;
1912         int r;
1913
1914         assert(link);
1915
1916         if (hashmap_isempty(link->bound_by_links))
1917                 return 0;
1918
1919         HASHMAP_FOREACH (l, link->bound_by_links, i) {
1920                 r = link_handle_bound_to_list(l);
1921                 if (r < 0)
1922                         return r;
1923         }
1924
1925         return 0;
1926 }
1927
1928 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
1929         int r;
1930
1931         assert(link);
1932         assert(carrier);
1933
1934         if (link == carrier)
1935                 return 0;
1936
1937         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
1938                 return 0;
1939
1940         r = hashmap_ensure_allocated(h, NULL);
1941         if (r < 0)
1942                 return r;
1943
1944         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
1945         if (r < 0)
1946                 return r;
1947
1948         return 0;
1949 }
1950
1951 static int link_new_bound_by_list(Link *link) {
1952         Manager *m;
1953         Link *carrier;
1954         Iterator i;
1955         int r;
1956         bool list_updated = false;
1957
1958         assert(link);
1959         assert(link->manager);
1960
1961         m = link->manager;
1962
1963         HASHMAP_FOREACH(carrier, m->links, i) {
1964                 if (!carrier->network)
1965                         continue;
1966
1967                 if (strv_isempty(carrier->network->bind_carrier))
1968                         continue;
1969
1970                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
1971                         r = link_put_carrier(link, carrier, &link->bound_by_links);
1972                         if (r < 0)
1973                                 return r;
1974
1975                         list_updated = true;
1976                 }
1977         }
1978
1979         if (list_updated)
1980                 link_dirty(link);
1981
1982         HASHMAP_FOREACH(carrier, link->bound_by_links, i) {
1983                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
1984                 if (r < 0)
1985                         return r;
1986
1987                 link_dirty(carrier);
1988         }
1989
1990         return 0;
1991 }
1992
1993 static int link_new_bound_to_list(Link *link) {
1994         Manager *m;
1995         Link *carrier;
1996         Iterator i;
1997         int r;
1998         bool list_updated = false;
1999
2000         assert(link);
2001         assert(link->manager);
2002
2003         if (!link->network)
2004                 return 0;
2005
2006         if (strv_isempty(link->network->bind_carrier))
2007                 return 0;
2008
2009         m = link->manager;
2010
2011         HASHMAP_FOREACH (carrier, m->links, i) {
2012                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2013                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2014                         if (r < 0)
2015                                 return r;
2016
2017                         list_updated = true;
2018                 }
2019         }
2020
2021         if (list_updated)
2022                 link_dirty(link);
2023
2024         HASHMAP_FOREACH (carrier, link->bound_to_links, i) {
2025                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2026                 if (r < 0)
2027                         return r;
2028
2029                 link_dirty(carrier);
2030         }
2031
2032         return 0;
2033 }
2034
2035 static int link_new_carrier_maps(Link *link) {
2036         int r;
2037
2038         r = link_new_bound_by_list(link);
2039         if (r < 0)
2040                 return r;
2041
2042         r = link_handle_bound_by_list(link);
2043         if (r < 0)
2044                 return r;
2045
2046         r = link_new_bound_to_list(link);
2047         if (r < 0)
2048                 return r;
2049
2050         r = link_handle_bound_to_list(link);
2051         if (r < 0)
2052                 return r;
2053
2054         return 0;
2055 }
2056
2057 static void link_free_bound_to_list(Link *link) {
2058         Link *bound_to;
2059         Iterator i;
2060
2061         HASHMAP_FOREACH (bound_to, link->bound_to_links, i) {
2062                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2063
2064                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2065                         link_dirty(bound_to);
2066         }
2067
2068         return;
2069 }
2070
2071 static void link_free_bound_by_list(Link *link) {
2072         Link *bound_by;
2073         Iterator i;
2074
2075         HASHMAP_FOREACH (bound_by, link->bound_by_links, i) {
2076                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2077
2078                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2079                         link_dirty(bound_by);
2080                         link_handle_bound_to_list(bound_by);
2081                 }
2082         }
2083
2084         return;
2085 }
2086
2087 static void link_free_carrier_maps(Link *link) {
2088         bool list_updated = false;
2089
2090         assert(link);
2091
2092         if (!hashmap_isempty(link->bound_to_links)) {
2093                 link_free_bound_to_list(link);
2094                 list_updated = true;
2095         }
2096
2097         if (!hashmap_isempty(link->bound_by_links)) {
2098                 link_free_bound_by_list(link);
2099                 list_updated = true;
2100         }
2101
2102         if (list_updated)
2103                 link_dirty(link);
2104
2105         return;
2106 }
2107
2108 static int link_append_to_master(Link *link, NetDev *netdev) {
2109         Link *master;
2110         int r;
2111
2112         assert(link);
2113         assert(netdev);
2114
2115         r = link_get(link->manager, netdev->ifindex, &master);
2116         if (r < 0)
2117                 return r;
2118
2119         r = set_ensure_allocated(&master->slaves, NULL);
2120         if (r < 0)
2121                 return r;
2122
2123         r = set_put(master->slaves, link);
2124         if (r <= 0)
2125                 return r;
2126
2127         link_ref(link);
2128         return 0;
2129 }
2130
2131 static void link_drop_from_master(Link *link, NetDev *netdev) {
2132         Link *master;
2133
2134         assert(link);
2135
2136         if (!link->manager || !netdev)
2137                 return;
2138
2139         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2140                 return;
2141
2142         link_unref(set_remove(master->slaves, link));
2143 }
2144
2145 static void link_detach_from_manager(Link *link) {
2146         if (!link || !link->manager)
2147                 return;
2148
2149         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2150         link_clean(link);
2151
2152         /* The following must be called at last. */
2153         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2154         link_unref(link);
2155 }
2156
2157 void link_drop(Link *link) {
2158         if (!link || link->state == LINK_STATE_LINGER)
2159                 return;
2160
2161         link_set_state(link, LINK_STATE_LINGER);
2162
2163         link_free_carrier_maps(link);
2164
2165         if (link->network) {
2166                 link_drop_from_master(link, link->network->bridge);
2167                 link_drop_from_master(link, link->network->bond);
2168         }
2169
2170         log_link_debug(link, "Link removed");
2171
2172         (void) unlink(link->state_file);
2173         link_detach_from_manager(link);
2174 }
2175
2176 static int link_joined(Link *link) {
2177         int r;
2178
2179         assert(link);
2180         assert(link->network);
2181
2182         if (!hashmap_isempty(link->bound_to_links)) {
2183                 r = link_handle_bound_to_list(link);
2184                 if (r < 0)
2185                         return r;
2186         } else if (!(link->flags & IFF_UP)) {
2187                 r = link_up(link);
2188                 if (r < 0) {
2189                         link_enter_failed(link);
2190                         return r;
2191                 }
2192         }
2193
2194         if (link->network->bridge) {
2195                 r = link_set_bridge(link);
2196                 if (r < 0)
2197                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2198
2199                 r = link_append_to_master(link, link->network->bridge);
2200                 if (r < 0)
2201                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2202         }
2203
2204         if (link->network->bond) {
2205                 r = link_set_bond(link);
2206                 if (r < 0)
2207                         log_link_error_errno(link, r, "Could not set bond message: %m");
2208
2209                 r = link_append_to_master(link, link->network->bond);
2210                 if (r < 0)
2211                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2212         }
2213
2214         if (link->network->use_br_vlan &&
2215             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2216                 r = link_set_bridge_vlan(link);
2217                 if (r < 0)
2218                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2219         }
2220
2221         /* Skip setting up addresses until it gets carrier,
2222            or it would try to set addresses twice,
2223            which is bad for non-idempotent steps. */
2224         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2225                 return 0;
2226
2227         link_set_state(link, LINK_STATE_CONFIGURING);
2228         return link_request_set_addresses(link);
2229 }
2230
2231 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2232         int r;
2233
2234         assert(link);
2235         assert(link->network);
2236         assert(link->enslaving > 0);
2237
2238         link->enslaving--;
2239
2240         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2241                 return 1;
2242
2243         r = sd_netlink_message_get_errno(m);
2244         if (r < 0 && r != -EEXIST) {
2245                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2246                 link_enter_failed(link);
2247                 return 1;
2248         }
2249
2250         log_link_debug(link, "Joined netdev");
2251
2252         if (link->enslaving == 0) {
2253                 r = link_joined(link);
2254                 if (r < 0)
2255                         link_enter_failed(link);
2256         }
2257
2258         return 1;
2259 }
2260
2261 static int link_enter_join_netdev(Link *link) {
2262         NetDev *netdev;
2263         Iterator i;
2264         int r;
2265
2266         assert(link);
2267         assert(link->network);
2268         assert(link->state == LINK_STATE_INITIALIZED);
2269
2270         link_set_state(link, LINK_STATE_CONFIGURING);
2271
2272         link_dirty(link);
2273         link->enslaving = 0;
2274
2275         if (link->network->bond) {
2276                 if (link->network->bond->state == NETDEV_STATE_READY &&
2277                     link->network->bond->ifindex == link->master_ifindex)
2278                         return link_joined(link);
2279
2280                 log_struct(LOG_DEBUG,
2281                            LOG_LINK_INTERFACE(link),
2282                            LOG_NETDEV_INTERFACE(link->network->bond),
2283                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2284
2285                 link->enslaving++;
2286
2287                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2288                 if (r < 0) {
2289                         log_struct_errno(LOG_WARNING, r,
2290                                          LOG_LINK_INTERFACE(link),
2291                                          LOG_NETDEV_INTERFACE(link->network->bond),
2292                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2293                         link_enter_failed(link);
2294                         return r;
2295                 }
2296         }
2297
2298         if (link->network->bridge) {
2299                 log_struct(LOG_DEBUG,
2300                            LOG_LINK_INTERFACE(link),
2301                            LOG_NETDEV_INTERFACE(link->network->bridge),
2302                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2303
2304                 link->enslaving++;
2305
2306                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2307                 if (r < 0) {
2308                         log_struct_errno(LOG_WARNING, r,
2309                                          LOG_LINK_INTERFACE(link),
2310                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2311                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2312                         link_enter_failed(link);
2313                         return r;
2314                 }
2315         }
2316
2317         if (link->network->vrf) {
2318                 log_struct(LOG_DEBUG,
2319                            LOG_LINK_INTERFACE(link),
2320                            LOG_NETDEV_INTERFACE(link->network->vrf),
2321                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2322
2323                 link->enslaving++;
2324
2325                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2326                 if (r < 0) {
2327                         log_struct_errno(LOG_WARNING, r,
2328                                          LOG_LINK_INTERFACE(link),
2329                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2330                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2331                         link_enter_failed(link);
2332                         return r;
2333                 }
2334         }
2335
2336         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs, i) {
2337
2338                 if (netdev->ifindex > 0)
2339                         /* Assume already enslaved. */
2340                         continue;
2341
2342                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2343                         continue;
2344
2345                 log_struct(LOG_DEBUG,
2346                            LOG_LINK_INTERFACE(link),
2347                            LOG_NETDEV_INTERFACE(netdev),
2348                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2349
2350                 link->enslaving++;
2351
2352                 r = netdev_join(netdev, link, netdev_join_handler);
2353                 if (r < 0) {
2354                         log_struct_errno(LOG_WARNING, r,
2355                                          LOG_LINK_INTERFACE(link),
2356                                          LOG_NETDEV_INTERFACE(netdev),
2357                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2358                         link_enter_failed(link);
2359                         return r;
2360                 }
2361         }
2362
2363         if (link->enslaving == 0)
2364                 return link_joined(link);
2365
2366         return 0;
2367 }
2368
2369 static int link_set_ipv4_forward(Link *link) {
2370         int r;
2371
2372         if (!link_ipv4_forward_enabled(link))
2373                 return 0;
2374
2375         /* We propagate the forwarding flag from one interface to the
2376          * global setting one way. This means: as long as at least one
2377          * interface was configured at any time that had IP forwarding
2378          * enabled the setting will stay on for good. We do this
2379          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2380          * somewhat in sync (see below). */
2381
2382         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2383         if (r < 0)
2384                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2385
2386         return 0;
2387 }
2388
2389 static int link_set_ipv6_forward(Link *link) {
2390         int r;
2391
2392         if (!link_ipv6_forward_enabled(link))
2393                 return 0;
2394
2395         /* On Linux, the IPv6 stack does not know a per-interface
2396          * packet forwarding setting: either packet forwarding is on
2397          * for all, or off for all. We hence don't bother with a
2398          * per-interface setting, but simply propagate the interface
2399          * flag, if it is set, to the global flag, one-way. Note that
2400          * while IPv4 would allow a per-interface flag, we expose the
2401          * same behaviour there and also propagate the setting from
2402          * one to all, to keep things simple (see above). */
2403
2404         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2405         if (r < 0)
2406                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2407
2408         return 0;
2409 }
2410
2411 static int link_set_ipv6_privacy_extensions(Link *link) {
2412         IPv6PrivacyExtensions s;
2413         int r;
2414
2415         s = link_ipv6_privacy_extensions(link);
2416         if (s < 0)
2417                 return 0;
2418
2419         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2420         if (r < 0)
2421                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2422
2423         return 0;
2424 }
2425
2426 static int link_set_ipv6_accept_ra(Link *link) {
2427         int r;
2428
2429         /* Make this a NOP if IPv6 is not available */
2430         if (!socket_ipv6_is_supported())
2431                 return 0;
2432
2433         if (link->flags & IFF_LOOPBACK)
2434                 return 0;
2435
2436         if (!link->network)
2437                 return 0;
2438
2439         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2440         if (r < 0)
2441                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2442
2443         return 0;
2444 }
2445
2446 static int link_set_ipv6_dad_transmits(Link *link) {
2447         int r;
2448
2449         /* Make this a NOP if IPv6 is not available */
2450         if (!socket_ipv6_is_supported())
2451                 return 0;
2452
2453         if (link->flags & IFF_LOOPBACK)
2454                 return 0;
2455
2456         if (!link->network)
2457                 return 0;
2458
2459         if (link->network->ipv6_dad_transmits < 0)
2460                 return 0;
2461
2462         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2463         if (r < 0)
2464                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2465
2466         return 0;
2467 }
2468
2469 static int link_set_ipv6_hop_limit(Link *link) {
2470         int r;
2471
2472         /* Make this a NOP if IPv6 is not available */
2473         if (!socket_ipv6_is_supported())
2474                 return 0;
2475
2476         if (link->flags & IFF_LOOPBACK)
2477                 return 0;
2478
2479         if (!link->network)
2480                 return 0;
2481
2482         if (link->network->ipv6_hop_limit < 0)
2483                 return 0;
2484
2485         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2486         if (r < 0)
2487                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2488
2489         return 0;
2490 }
2491
2492 static int link_set_ipv6_mtu(Link *link) {
2493         int r;
2494
2495         /* Make this a NOP if IPv6 is not available */
2496         if (!socket_ipv6_is_supported())
2497                 return 0;
2498
2499         if (link->flags & IFF_LOOPBACK)
2500                 return 0;
2501
2502         if (link->network->ipv6_mtu == 0)
2503                 return 0;
2504
2505         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2506          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2507         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2508                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2509                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2510         }
2511
2512         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2513         if (r < 0) {
2514                 if (link->mtu < link->network->ipv6_mtu)
2515                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2516                                          link->network->ipv6_mtu, link->mtu);
2517                 else
2518                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2519         }
2520
2521         link->ipv6_mtu_set = true;
2522
2523         return 0;
2524 }
2525
2526 static bool link_is_static_address_configured(Link *link, Address *address) {
2527         Address *net_address;
2528
2529         assert(link);
2530         assert(address);
2531
2532         if (!link->network)
2533                 return false;
2534
2535         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2536                 if (address_equal(net_address, address))
2537                         return true;
2538
2539         return false;
2540 }
2541
2542 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2543         Neighbor *net_neighbor;
2544
2545         assert(link);
2546         assert(neighbor);
2547
2548         if (!link->network)
2549                 return false;
2550
2551         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2552                 if (neighbor_equal(net_neighbor, neighbor))
2553                         return true;
2554
2555         return false;
2556 }
2557
2558 static bool link_is_static_route_configured(Link *link, Route *route) {
2559         Route *net_route;
2560
2561         assert(link);
2562         assert(route);
2563
2564         if (!link->network)
2565                 return false;
2566
2567         LIST_FOREACH(routes, net_route, link->network->static_routes)
2568                 if (route_equal(net_route, route))
2569                         return true;
2570
2571         return false;
2572 }
2573
2574 static bool link_address_is_dynamic(Link *link, Address *address) {
2575         Route *route;
2576         Iterator i;
2577
2578         assert(link);
2579         assert(address);
2580
2581         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2582                 return true;
2583
2584         /* Even when the address is leased from a DHCP server, networkd assign the address
2585          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2586          * corresponding routes with RTPROT_DHCP. */
2587         SET_FOREACH(route, link->routes_foreign, i) {
2588                 if (route->protocol != RTPROT_DHCP)
2589                         continue;
2590
2591                 if (address->family != route->family)
2592                         continue;
2593
2594                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2595                         return true;
2596         }
2597
2598         return false;
2599 }
2600
2601 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2602         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2603         sd_netlink_message *addr;
2604         int r;
2605
2606         assert(link);
2607         assert(link->manager);
2608         assert(link->manager->rtnl);
2609
2610         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2611         if (r < 0)
2612                 return r;
2613
2614         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2615         if (r < 0)
2616                 return r;
2617
2618         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2619                 unsigned char flags;
2620                 int ifindex;
2621
2622                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2623                 if (r < 0) {
2624                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2625                         continue;
2626                 } else if (link->ifindex != ifindex)
2627                         continue;
2628
2629                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2630                 if (r < 0) {
2631                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2632                         continue;
2633                 } else if (!(flags & IFA_F_TENTATIVE))
2634                         continue;
2635
2636                 log_link_debug(link, "Found tentative ipv6 link-local address");
2637                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2638         }
2639
2640         return 0;
2641 }
2642
2643 static int link_drop_foreign_config(Link *link) {
2644         Address *address;
2645         Neighbor *neighbor;
2646         Route *route;
2647         Iterator i;
2648         int r;
2649
2650         /* The kernel doesn't notify us about tentative addresses;
2651          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2652         if (!link_ipv6ll_enabled(link)) {
2653                 r = link_enumerate_ipv6_tentative_addresses(link);
2654                 if (r < 0)
2655                         return r;
2656         }
2657
2658         SET_FOREACH(address, link->addresses_foreign, i) {
2659                 /* we consider IPv6LL addresses to be managed by the kernel */
2660                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2661                         continue;
2662
2663                 if (link_address_is_dynamic(link, address)) {
2664                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2665                                 continue;
2666                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2667                         continue;
2668
2669                 if (link_is_static_address_configured(link, address)) {
2670                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2671                         if (r < 0)
2672                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2673                 } else {
2674                         r = address_remove(address, link, NULL);
2675                         if (r < 0)
2676                                 return r;
2677                 }
2678         }
2679
2680         SET_FOREACH(neighbor, link->neighbors_foreign, i) {
2681                 if (link_is_neighbor_configured(link, neighbor)) {
2682                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2683                         if (r < 0)
2684                                 return r;
2685                 } else {
2686                         r = neighbor_remove(neighbor, link, NULL);
2687                         if (r < 0)
2688                                 return r;
2689                 }
2690         }
2691
2692         SET_FOREACH(route, link->routes_foreign, i) {
2693                 /* do not touch routes managed by the kernel */
2694                 if (route->protocol == RTPROT_KERNEL)
2695                         continue;
2696
2697                 /* do not touch multicast route added by kernel */
2698                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2699                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2700                 if (route->protocol == RTPROT_BOOT &&
2701                     route->family == AF_INET6 &&
2702                     route->dst_prefixlen == 8 &&
2703                     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 }}} }))
2704                         continue;
2705
2706                 if (route->protocol == RTPROT_STATIC && link->network &&
2707                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2708                         continue;
2709
2710                 if (route->protocol == RTPROT_DHCP && link->network &&
2711                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2712                         continue;
2713
2714                 if (link_is_static_route_configured(link, route)) {
2715                         r = route_add(link, route, NULL);
2716                         if (r < 0)
2717                                 return r;
2718                 } else {
2719                         r = route_remove(route, link, NULL);
2720                         if (r < 0)
2721                                 return r;
2722                 }
2723         }
2724
2725         return 0;
2726 }
2727
2728 static int link_drop_config(Link *link) {
2729         Address *address, *pool_address;
2730         Neighbor *neighbor;
2731         Route *route;
2732         Iterator i;
2733         int r;
2734
2735         SET_FOREACH(address, link->addresses, i) {
2736                 /* we consider IPv6LL addresses to be managed by the kernel */
2737                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2738                         continue;
2739
2740                 r = address_remove(address, link, NULL);
2741                 if (r < 0)
2742                         return r;
2743
2744                 /* If this address came from an address pool, clean up the pool */
2745                 LIST_FOREACH(addresses, pool_address, link->pool_addresses) {
2746                         if (address_equal(address, pool_address)) {
2747                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2748                                 address_free(pool_address);
2749                                 break;
2750                         }
2751                 }
2752         }
2753
2754         SET_FOREACH(neighbor, link->neighbors, i) {
2755                 r = neighbor_remove(neighbor, link, NULL);
2756                 if (r < 0)
2757                         return r;
2758         }
2759
2760         SET_FOREACH(route, link->routes, i) {
2761                 /* do not touch routes managed by the kernel */
2762                 if (route->protocol == RTPROT_KERNEL)
2763                         continue;
2764
2765                 r = route_remove(route, link, NULL);
2766                 if (r < 0)
2767                         return r;
2768         }
2769
2770         ndisc_flush(link);
2771
2772         return 0;
2773 }
2774
2775 static int link_configure_ipv4_dad(Link *link) {
2776         Address *address;
2777         int r;
2778
2779         assert(link);
2780         assert(link->network);
2781
2782         LIST_FOREACH(addresses, address, link->network->static_addresses)
2783                 if (address->family == AF_INET &&
2784                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2785                         r = configure_ipv4_duplicate_address_detection(link, address);
2786                         if (r < 0)
2787                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2788                 }
2789
2790         return 0;
2791 }
2792
2793 static int link_configure_traffic_control(Link *link) {
2794         TrafficControl *tc;
2795         Iterator i;
2796         int r;
2797
2798         link->tc_configured = false;
2799         link->tc_messages = 0;
2800
2801         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section, i) {
2802                 r = traffic_control_configure(link, tc);
2803                 if (r < 0)
2804                         return r;
2805         }
2806
2807         if (link->tc_messages == 0)
2808                 link->tc_configured = true;
2809         else
2810                 log_link_debug(link, "Configuring traffic control");
2811
2812         return 0;
2813 }
2814
2815 static int link_configure(Link *link) {
2816         int r;
2817
2818         assert(link);
2819         assert(link->network);
2820         assert(link->state == LINK_STATE_INITIALIZED);
2821
2822         r = link_configure_traffic_control(link);
2823         if (r < 0)
2824                 return r;
2825
2826         if (link->iftype == ARPHRD_CAN)
2827                 return link_configure_can(link);
2828
2829         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
2830          * for this interface, then enable IPv6 */
2831         (void) link_update_ipv6_sysctl(link);
2832
2833         r = link_set_proxy_arp(link);
2834         if (r < 0)
2835                return r;
2836
2837         r = ipv6_proxy_ndp_addresses_configure(link);
2838         if (r < 0)
2839                 return r;
2840
2841         r = link_set_ipv4_forward(link);
2842         if (r < 0)
2843                 return r;
2844
2845         r = link_set_ipv6_forward(link);
2846         if (r < 0)
2847                 return r;
2848
2849         r = link_set_ipv6_privacy_extensions(link);
2850         if (r < 0)
2851                 return r;
2852
2853         r = link_set_ipv6_accept_ra(link);
2854         if (r < 0)
2855                 return r;
2856
2857         r = link_set_ipv6_dad_transmits(link);
2858         if (r < 0)
2859                 return r;
2860
2861         r = link_set_ipv6_hop_limit(link);
2862         if (r < 0)
2863                 return r;
2864
2865         r = link_set_flags(link);
2866         if (r < 0)
2867                 return r;
2868
2869         r = link_set_group(link);
2870         if (r < 0)
2871                 return r;
2872
2873         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
2874                 r = ipv4ll_configure(link);
2875                 if (r < 0)
2876                         return r;
2877         }
2878
2879         if (link_dhcp4_enabled(link)) {
2880                 r = dhcp4_set_promote_secondaries(link);
2881                 if (r < 0)
2882                         return r;
2883
2884                 r = dhcp4_configure(link);
2885                 if (r < 0)
2886                         return r;
2887         }
2888
2889         if (link_dhcp4_server_enabled(link)) {
2890                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
2891                 if (r < 0)
2892                         return r;
2893
2894                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
2895                 if (r < 0)
2896                         return r;
2897         }
2898
2899         if (link_dhcp6_enabled(link) ||
2900             link_ipv6_accept_ra_enabled(link)) {
2901                 r = dhcp6_configure(link);
2902                 if (r < 0)
2903                         return r;
2904         }
2905
2906         if (link_ipv6_accept_ra_enabled(link)) {
2907                 r = ndisc_configure(link);
2908                 if (r < 0)
2909                         return r;
2910         }
2911
2912         if (link_radv_enabled(link)) {
2913                 r = radv_configure(link);
2914                 if (r < 0)
2915                         return r;
2916         }
2917
2918         if (link_lldp_rx_enabled(link)) {
2919                 r = link_lldp_rx_configure(link);
2920                 if (r < 0)
2921                         return r;
2922         }
2923
2924         r = link_configure_mtu(link);
2925         if (r < 0)
2926                 return r;
2927
2928         r = link_configure_addrgen_mode(link);
2929         if (r < 0)
2930                 return r;
2931
2932         r = link_configure_ipv4_dad(link);
2933         if (r < 0)
2934                 return r;
2935
2936         return link_configure_continue(link);
2937 }
2938
2939 /* The configuration continues in this separate function, instead of
2940  * including this in the above link_configure() function, for two
2941  * reasons:
2942  * 1) some devices reset the link when the mtu is set, which caused
2943  *    an infinite loop here in networkd; see:
2944  *    https://github.com/systemd/systemd/issues/6593
2945  *    https://github.com/systemd/systemd/issues/9831
2946  * 2) if ipv6ll is disabled, then bringing the interface up must be
2947  *    delayed until after we get confirmation from the kernel that
2948  *    the addr_gen_mode parameter has been set (via netlink), see:
2949  *    https://github.com/systemd/systemd/issues/13882
2950  */
2951 static int link_configure_continue(Link *link) {
2952         int r;
2953
2954         assert(link);
2955         assert(link->network);
2956         assert(link->state == LINK_STATE_INITIALIZED);
2957
2958         if (link->setting_mtu || link->setting_genmode)
2959                 return 0;
2960
2961         /* Drop foreign config, but ignore loopback or critical devices.
2962          * We do not want to remove loopback address or addresses used for root NFS. */
2963         if (!(link->flags & IFF_LOOPBACK) &&
2964             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
2965                 r = link_drop_foreign_config(link);
2966                 if (r < 0)
2967                         return r;
2968         }
2969
2970         /* The kernel resets ipv6 mtu after changing device mtu;
2971          * we must set this here, after we've set device mtu */
2972         r = link_set_ipv6_mtu(link);
2973         if (r < 0)
2974                 return r;
2975
2976         if (link_has_carrier(link) || link->network->configure_without_carrier) {
2977                 r = link_acquire_conf(link);
2978                 if (r < 0)
2979                         return r;
2980         }
2981
2982         return link_enter_join_netdev(link);
2983 }
2984
2985 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
2986         assert(duid);
2987
2988         if (duid->raw_data_len > 0)
2989                 return 0;
2990
2991         if (duid->type != DUID_TYPE_UUID)
2992                 return -EINVAL;
2993
2994         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
2995         duid->raw_data_len = sizeof(sd_id128_t);
2996
2997         return 1;
2998 }
2999
3000 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3001         Manager *manager = userdata;
3002         const sd_bus_error *e;
3003         const void *a;
3004         size_t sz;
3005         DUID *duid;
3006         Link *link;
3007         int r;
3008
3009         assert(m);
3010         assert(manager);
3011
3012         e = sd_bus_message_get_error(m);
3013         if (e) {
3014                 log_error_errno(sd_bus_error_get_errno(e),
3015                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3016                                 e->message);
3017                 goto configure;
3018         }
3019
3020         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3021         if (r < 0)
3022                 goto configure;
3023
3024         if (sz != sizeof(sd_id128_t)) {
3025                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3026                 goto configure;
3027         }
3028
3029         memcpy(&manager->product_uuid, a, sz);
3030         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3031                 (void) duid_set_uuid(duid, manager->product_uuid);
3032
3033         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3034
3035 configure:
3036         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3037                 link_unref(link);
3038
3039                 r = link_configure(link);
3040                 if (r < 0)
3041                         link_enter_failed(link);
3042         }
3043
3044         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3045
3046         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3047          * even if the method fails. */
3048         manager->has_product_uuid = true;
3049
3050         return 1;
3051 }
3052
3053 static bool link_requires_uuid(Link *link) {
3054         const DUID *duid;
3055
3056         assert(link);
3057         assert(link->manager);
3058         assert(link->network);
3059
3060         duid = link_get_duid(link);
3061         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3062                 return false;
3063
3064         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3065                 return true;
3066
3067         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3068                 return true;
3069
3070         return false;
3071 }
3072
3073 static int link_configure_duid(Link *link) {
3074         Manager *m;
3075         DUID *duid;
3076         int r;
3077
3078         assert(link);
3079         assert(link->manager);
3080         assert(link->network);
3081
3082         m = link->manager;
3083         duid = link_get_duid(link);
3084
3085         if (!link_requires_uuid(link))
3086                 return 1;
3087
3088         if (m->has_product_uuid) {
3089                 (void) duid_set_uuid(duid, m->product_uuid);
3090                 return 1;
3091         }
3092
3093         if (!m->links_requesting_uuid) {
3094                 r = manager_request_product_uuid(m, link);
3095                 if (r < 0) {
3096                         if (r == -ENOMEM)
3097                                 return r;
3098
3099                         log_link_warning_errno(link, r,
3100                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3101                         return 1;
3102                 }
3103         } else {
3104                 r = set_put(m->links_requesting_uuid, link);
3105                 if (r < 0)
3106                         return log_oom();
3107
3108                 r = set_put(m->duids_requesting_uuid, duid);
3109                 if (r < 0)
3110                         return log_oom();
3111
3112                 link_ref(link);
3113         }
3114
3115         return 0;
3116 }
3117
3118 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3119         Network *network;
3120         int r;
3121
3122         if (m) {
3123                 _cleanup_strv_free_ char **s = NULL;
3124
3125                 r = sd_netlink_message_get_errno(m);
3126                 if (r < 0)
3127                         return r;
3128
3129                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3130                 if (r < 0 && r != -ENODATA)
3131                         return r;
3132
3133                 strv_free_and_replace(link->alternative_names, s);
3134         }
3135
3136         r = network_get(link->manager, link->iftype, link->sd_device, link->ifname, link->alternative_names,
3137                         &link->mac, &link->permanent_mac, link->wlan_iftype, link->ssid, &link->bssid, &network);
3138         if (r == -ENOENT) {
3139                 link_enter_unmanaged(link);
3140                 return 0;
3141         } else if (r == 0 && network->unmanaged) {
3142                 link_enter_unmanaged(link);
3143                 return 0;
3144         } else if (r < 0)
3145                 return r;
3146
3147         if (link->network == network && !force)
3148                 return 0;
3149
3150         log_link_info(link, "Re-configuring with %s", network->filename);
3151
3152         /* Dropping old .network file */
3153         r = link_stop_clients(link, false);
3154         if (r < 0)
3155                 return r;
3156
3157         if (link_dhcp4_server_enabled(link))
3158                 (void) sd_dhcp_server_stop(link->dhcp_server);
3159
3160         r = link_drop_config(link);
3161         if (r < 0)
3162                 return r;
3163
3164         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3165                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3166                 r = link_drop_foreign_config(link);
3167                 if (r < 0)
3168                         return r;
3169         }
3170
3171         link_free_carrier_maps(link);
3172         link_free_engines(link);
3173         link->network = network_unref(link->network);
3174
3175         /* Then, apply new .network file */
3176         r = network_apply(network, link);
3177         if (r < 0)
3178                 return r;
3179
3180         r = link_new_carrier_maps(link);
3181         if (r < 0)
3182                 return r;
3183
3184         link_set_state(link, LINK_STATE_INITIALIZED);
3185         link_dirty(link);
3186
3187         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3188          * link_configure() is called later asynchronously. */
3189         r = link_configure_duid(link);
3190         if (r <= 0)
3191                 return r;
3192
3193         r = link_configure(link);
3194         if (r < 0)
3195                 return r;
3196
3197         return 0;
3198 }
3199
3200 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3201         int r;
3202
3203         r = link_reconfigure_internal(link, m, false);
3204         if (r < 0)
3205                 link_enter_failed(link);
3206
3207         return 1;
3208 }
3209
3210 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3211         int r;
3212
3213         r = link_reconfigure_internal(link, m, true);
3214         if (r < 0)
3215                 link_enter_failed(link);
3216
3217         return 1;
3218 }
3219
3220 int link_reconfigure(Link *link, bool force) {
3221         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3222         int r;
3223
3224         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3225                 return 0;
3226
3227         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3228                                      link->ifindex);
3229         if (r < 0)
3230                 return r;
3231
3232         r = netlink_call_async(link->manager->rtnl, NULL, req,
3233                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3234                                link_netlink_destroy_callback, link);
3235         if (r < 0)
3236                 return r;
3237
3238         link_ref(link);
3239
3240         return 0;
3241 }
3242
3243 static int link_initialized_and_synced(Link *link) {
3244         Network *network;
3245         int r;
3246
3247         assert(link);
3248         assert(link->ifname);
3249         assert(link->manager);
3250
3251         /* We may get called either from the asynchronous netlink callback,
3252          * or directly for link_add() if running in a container. See link_add(). */
3253         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3254                 return 0;
3255
3256         log_link_debug(link, "Link state is up-to-date");
3257         link_set_state(link, LINK_STATE_INITIALIZED);
3258
3259         r = link_new_bound_by_list(link);
3260         if (r < 0)
3261                 return r;
3262
3263         r = link_handle_bound_by_list(link);
3264         if (r < 0)
3265                 return r;
3266
3267         if (!link->network) {
3268                 r = wifi_get_info(link);
3269                 if (r < 0)
3270                         return r;
3271
3272                 r = network_get(link->manager, link->iftype, link->sd_device, link->ifname, link->alternative_names,
3273                                 &link->mac, &link->permanent_mac, link->wlan_iftype, link->ssid, &link->bssid, &network);
3274                 if (r == -ENOENT) {
3275                         link_enter_unmanaged(link);
3276                         return 0;
3277                 } else if (r == 0 && network->unmanaged) {
3278                         link_enter_unmanaged(link);
3279                         return 0;
3280                 } else if (r < 0)
3281                         return r;
3282
3283                 if (link->flags & IFF_LOOPBACK) {
3284                         if (network->link_local != ADDRESS_FAMILY_NO)
3285                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3286
3287                         if (network->dhcp != ADDRESS_FAMILY_NO)
3288                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3289
3290                         if (network->dhcp_server)
3291                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3292                 }
3293
3294                 r = network_apply(network, link);
3295                 if (r < 0)
3296                         return r;
3297         }
3298
3299         r = link_new_bound_to_list(link);
3300         if (r < 0)
3301                 return r;
3302
3303         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3304          * link_configure() is called later asynchronously. */
3305         r = link_configure_duid(link);
3306         if (r <= 0)
3307                 return r;
3308
3309         r = link_configure(link);
3310         if (r < 0)
3311                 return r;
3312
3313         return 0;
3314 }
3315
3316 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3317         _cleanup_strv_free_ char **s = NULL;
3318         int r;
3319
3320         r = sd_netlink_message_get_errno(m);
3321         if (r < 0) {
3322                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3323                 link_enter_failed(link);
3324                 return 0;
3325         }
3326
3327         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3328         if (r < 0 && r != -ENODATA) {
3329                 link_enter_failed(link);
3330                 return 0;
3331         }
3332
3333         strv_free_and_replace(link->alternative_names, s);
3334
3335         r = link_initialized_and_synced(link);
3336         if (r < 0)
3337                 link_enter_failed(link);
3338         return 1;
3339 }
3340
3341 int link_initialized(Link *link, sd_device *device) {
3342         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3343         int r;
3344
3345         assert(link);
3346         assert(link->manager);
3347         assert(link->manager->rtnl);
3348         assert(device);
3349
3350         if (link->state != LINK_STATE_PENDING)
3351                 return 0;
3352
3353         if (link->sd_device)
3354                 return 0;
3355
3356         log_link_debug(link, "udev initialized link");
3357         link_set_state(link, LINK_STATE_INITIALIZED);
3358
3359         link->sd_device = sd_device_ref(device);
3360
3361         /* udev has initialized the link, but we don't know if we have yet
3362          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3363          * when it returns we know that the pending NEWLINKs have already been
3364          * processed and that we are up-to-date */
3365
3366         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3367                                      link->ifindex);
3368         if (r < 0)
3369                 return r;
3370
3371         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3372                                link_netlink_destroy_callback, link);
3373         if (r < 0)
3374                 return r;
3375
3376         link_ref(link);
3377
3378         return 0;
3379 }
3380
3381 static int link_load(Link *link) {
3382         _cleanup_free_ char *network_file = NULL,
3383                             *addresses = NULL,
3384                             *routes = NULL,
3385                             *dhcp4_address = NULL,
3386                             *ipv4ll_address = NULL;
3387         union in_addr_union address;
3388         const char *p;
3389         int r;
3390
3391         assert(link);
3392
3393         r = parse_env_file(NULL, link->state_file,
3394                            "NETWORK_FILE", &network_file,
3395                            "ADDRESSES", &addresses,
3396                            "ROUTES", &routes,
3397                            "DHCP4_ADDRESS", &dhcp4_address,
3398                            "IPV4LL_ADDRESS", &ipv4ll_address);
3399         if (r < 0 && r != -ENOENT)
3400                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3401
3402         if (network_file) {
3403                 Network *network;
3404                 char *suffix;
3405
3406                 /* drop suffix */
3407                 suffix = strrchr(network_file, '.');
3408                 if (!suffix) {
3409                         log_link_debug(link, "Failed to get network name from %s", network_file);
3410                         goto network_file_fail;
3411                 }
3412                 *suffix = '\0';
3413
3414                 r = network_get_by_name(link->manager, basename(network_file), &network);
3415                 if (r < 0) {
3416                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3417                         goto network_file_fail;
3418                 }
3419
3420                 r = network_apply(network, link);
3421                 if (r < 0)
3422                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3423         }
3424
3425 network_file_fail:
3426
3427         if (addresses) {
3428                 p = addresses;
3429
3430                 for (;;) {
3431                         _cleanup_free_ char *address_str = NULL;
3432                         char *prefixlen_str;
3433                         int family;
3434                         unsigned char prefixlen;
3435
3436                         r = extract_first_word(&p, &address_str, NULL, 0);
3437                         if (r < 0) {
3438                                 log_link_debug_errno(link, r, "Failed to extract next address string: %m");
3439                                 continue;
3440                         }
3441                         if (r == 0)
3442                                 break;
3443
3444                         prefixlen_str = strchr(address_str, '/');
3445                         if (!prefixlen_str) {
3446                                 log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3447                                 continue;
3448                         }
3449
3450                         *prefixlen_str++ = '\0';
3451
3452                         r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3453                         if (r != 1) {
3454                                 log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3455                                 continue;
3456                         }
3457
3458                         r = in_addr_from_string_auto(address_str, &family, &address);
3459                         if (r < 0) {
3460                                 log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3461                                 continue;
3462                         }
3463
3464                         r = address_add(link, family, &address, prefixlen, NULL);
3465                         if (r < 0)
3466                                 return log_link_error_errno(link, r, "Failed to add address: %m");
3467                 }
3468         }
3469
3470         if (routes) {
3471                 p = routes;
3472
3473                 for (;;) {
3474                         _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3475                         _cleanup_(route_freep) Route *tmp = NULL;
3476                         _cleanup_free_ char *route_str = NULL;
3477                         char *prefixlen_str;
3478                         Route *route;
3479
3480                         r = extract_first_word(&p, &route_str, NULL, 0);
3481                         if (r < 0) {
3482                                 log_link_debug_errno(link, r, "Failed to extract next route string: %m");
3483                                 continue;
3484                         }
3485                         if (r == 0)
3486                                 break;
3487
3488                         prefixlen_str = strchr(route_str, '/');
3489                         if (!prefixlen_str) {
3490                                 log_link_debug(link, "Failed to parse route %s", route_str);
3491                                 continue;
3492                         }
3493
3494                         *prefixlen_str++ = '\0';
3495
3496                         r = route_new(&tmp);
3497                         if (r < 0)
3498                                 return log_oom();
3499
3500                         r = sscanf(prefixlen_str, "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT, &tmp->dst_prefixlen, &tmp->tos, &tmp->priority, &tmp->table, &tmp->lifetime);
3501                         if (r != 5) {
3502                                 log_link_debug(link,
3503                                                "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3504                                                prefixlen_str);
3505                                 continue;
3506                         }
3507
3508                         r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3509                         if (r < 0) {
3510                                 log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3511                                 continue;
3512                         }
3513
3514                         r = route_add(link, tmp, &route);
3515                         if (r < 0)
3516                                 return log_link_error_errno(link, r, "Failed to add route: %m");
3517
3518                         if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3519                                 r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(), route->lifetime,
3520                                                       0, route_expire_handler, route);
3521                                 if (r < 0)
3522                                         log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3523                         }
3524
3525                         sd_event_source_unref(route->expire);
3526                         route->expire = TAKE_PTR(expire);
3527                 }
3528         }
3529
3530         if (dhcp4_address) {
3531                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3532                 if (r < 0) {
3533                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3534                         goto dhcp4_address_fail;
3535                 }
3536
3537                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3538                 if (r < 0)
3539                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3540
3541                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3542                 if (r < 0)
3543                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3544
3545                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3546                 if (r < 0)
3547                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3548         }
3549
3550 dhcp4_address_fail:
3551
3552         if (ipv4ll_address) {
3553                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3554                 if (r < 0) {
3555                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3556                         goto ipv4ll_address_fail;
3557                 }
3558
3559                 r = sd_ipv4ll_new(&link->ipv4ll);
3560                 if (r < 0)
3561                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3562
3563                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3564                 if (r < 0)
3565                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3566
3567                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3568                 if (r < 0)
3569                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3570         }
3571
3572 ipv4ll_address_fail:
3573
3574         return 0;
3575 }
3576
3577 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3578         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3579         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3580         Link *link;
3581         int r;
3582
3583         assert(m);
3584         assert(m->rtnl);
3585         assert(message);
3586         assert(ret);
3587
3588         r = link_new(m, message, ret);
3589         if (r < 0)
3590                 return r;
3591
3592         link = *ret;
3593
3594         log_link_debug(link, "Link %d added", link->ifindex);
3595
3596         r = link_load(link);
3597         if (r < 0)
3598                 return r;
3599
3600         if (path_is_read_only_fs("/sys") <= 0) {
3601                 /* udev should be around */
3602                 sprintf(ifindex_str, "n%d", link->ifindex);
3603                 r = sd_device_new_from_device_id(&device, ifindex_str);
3604                 if (r < 0) {
3605                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3606                         return 0;
3607                 }
3608
3609                 r = sd_device_get_is_initialized(device);
3610                 if (r < 0) {
3611                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3612                         goto failed;
3613                 }
3614                 if (r == 0) {
3615                         /* not yet ready */
3616                         log_link_debug(link, "link pending udev initialization...");
3617                         return 0;
3618                 }
3619
3620                 r = device_is_renaming(device);
3621                 if (r < 0) {
3622                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3623                         goto failed;
3624                 }
3625                 if (r > 0) {
3626                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3627                         return 0;
3628                 }
3629
3630                 r = link_initialized(link, device);
3631                 if (r < 0)
3632                         goto failed;
3633         } else {
3634                 r = link_initialized_and_synced(link);
3635                 if (r < 0)
3636                         goto failed;
3637         }
3638
3639         return 0;
3640 failed:
3641         link_enter_failed(link);
3642         return r;
3643 }
3644
3645 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3646         int r;
3647
3648         assert(link);
3649
3650         log_link_info(link, "Gained IPv6LL");
3651
3652         link->ipv6ll_address = *address;
3653         link_check_ready(link);
3654
3655         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3656                 r = link_acquire_ipv6_conf(link);
3657                 if (r < 0) {
3658                         link_enter_failed(link);
3659                         return r;
3660                 }
3661         }
3662
3663         return 0;
3664 }
3665
3666 static int link_carrier_gained(Link *link) {
3667         int r;
3668
3669         assert(link);
3670
3671         r = wifi_get_info(link);
3672         if (r < 0)
3673                 return r;
3674         if (r > 0) {
3675                 r = link_reconfigure_internal(link, NULL, false);
3676                 if (r < 0) {
3677                         link_enter_failed(link);
3678                         return r;
3679                 }
3680         }
3681
3682         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3683                 r = link_acquire_conf(link);
3684                 if (r < 0) {
3685                         link_enter_failed(link);
3686                         return r;
3687                 }
3688
3689                 link_set_state(link, LINK_STATE_CONFIGURING);
3690                 r = link_request_set_addresses(link);
3691                 if (r < 0)
3692                         return r;
3693         }
3694
3695         r = link_handle_bound_by_list(link);
3696         if (r < 0)
3697                 return r;
3698
3699         return 0;
3700 }
3701
3702 static int link_carrier_lost(Link *link) {
3703         int r;
3704
3705         assert(link);
3706
3707         if (link->network && link->network->ignore_carrier_loss)
3708                 return 0;
3709
3710         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3711          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3712          * configuration and stop the clients as well. */
3713         if (link->setting_mtu)
3714                 return 0;
3715
3716         r = link_stop_clients(link, false);
3717         if (r < 0) {
3718                 link_enter_failed(link);
3719                 return r;
3720         }
3721
3722         if (link_dhcp4_server_enabled(link))
3723                 (void) sd_dhcp_server_stop(link->dhcp_server);
3724
3725         r = link_drop_config(link);
3726         if (r < 0)
3727                 return r;
3728
3729         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3730                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3731                 r = link_drop_foreign_config(link);
3732                 if (r < 0)
3733                         return r;
3734         }
3735
3736         r = link_handle_bound_by_list(link);
3737         if (r < 0)
3738                 return r;
3739
3740         return 0;
3741 }
3742
3743 int link_carrier_reset(Link *link) {
3744         int r;
3745
3746         assert(link);
3747
3748         if (link_has_carrier(link)) {
3749                 r = link_carrier_lost(link);
3750                 if (r < 0)
3751                         return r;
3752
3753                 r = link_carrier_gained(link);
3754                 if (r < 0)
3755                         return r;
3756
3757                 log_link_info(link, "Reset carrier");
3758         }
3759
3760         return 0;
3761 }
3762
3763 /* This is called every time an interface admin state changes to up;
3764  * specifically, when IFF_UP flag changes from unset to set */
3765 static int link_admin_state_up(Link *link) {
3766         int r;
3767
3768         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3769          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3770          * ipv6_mtu_set prevents this from trying to set it too early before
3771          * the link->network has been setup; we only need to reset it
3772          * here if we've already set it during normal initialization. */
3773         if (link->ipv6_mtu_set) {
3774                 r = link_set_ipv6_mtu(link);
3775                 if (r < 0)
3776                         return r;
3777         }
3778
3779         return 0;
3780 }
3781
3782 int link_update(Link *link, sd_netlink_message *m) {
3783         _cleanup_strv_free_ char **s = NULL;
3784         struct ether_addr mac;
3785         const char *ifname;
3786         uint32_t mtu;
3787         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3788         int old_master, r;
3789
3790         assert(link);
3791         assert(link->ifname);
3792         assert(m);
3793
3794         if (link->state == LINK_STATE_LINGER) {
3795                 log_link_info(link, "Link re-added");
3796                 link_set_state(link, LINK_STATE_CONFIGURING);
3797
3798                 r = link_new_carrier_maps(link);
3799                 if (r < 0)
3800                         return r;
3801         }
3802
3803         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
3804         if (r >= 0 && !streq(ifname, link->ifname)) {
3805                 Manager *manager = link->manager;
3806
3807                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
3808
3809                 link_drop(link);
3810                 r = link_add(manager, m, &link);
3811                 if (r < 0)
3812                         return r;
3813         }
3814
3815         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3816         if (r >= 0)
3817                 strv_free_and_replace(link->alternative_names, s);
3818
3819         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
3820         if (r >= 0 && mtu > 0) {
3821                 link->mtu = mtu;
3822                 if (link->original_mtu == 0) {
3823                         link->original_mtu = mtu;
3824                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
3825                 }
3826
3827                 if (link->dhcp_client) {
3828                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
3829                                                    link->mtu);
3830                         if (r < 0)
3831                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
3832                 }
3833
3834                 if (link->radv) {
3835                         r = sd_radv_set_mtu(link->radv, link->mtu);
3836                         if (r < 0)
3837                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
3838                 }
3839         }
3840
3841         /* The kernel may broadcast NEWLINK messages without the MAC address
3842            set, simply ignore them. */
3843         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
3844         if (r >= 0) {
3845                 if (memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet,
3846                            ETH_ALEN)) {
3847
3848                         memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet,
3849                                ETH_ALEN);
3850
3851                         log_link_debug(link, "MAC address: "
3852                                        "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
3853                                        mac.ether_addr_octet[0],
3854                                        mac.ether_addr_octet[1],
3855                                        mac.ether_addr_octet[2],
3856                                        mac.ether_addr_octet[3],
3857                                        mac.ether_addr_octet[4],
3858                                        mac.ether_addr_octet[5]);
3859
3860                         if (link->ipv4ll) {
3861                                 r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
3862                                 if (r < 0)
3863                                         return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
3864                         }
3865
3866                         if (link->dhcp_client) {
3867                                 r = sd_dhcp_client_set_mac(link->dhcp_client,
3868                                                            (const uint8_t *) &link->mac,
3869                                                            sizeof (link->mac),
3870                                                            ARPHRD_ETHER);
3871                                 if (r < 0)
3872                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
3873
3874                                 r = dhcp4_set_client_identifier(link);
3875                                 if (r < 0)
3876                                         return r;
3877                         }
3878
3879                         if (link->dhcp6_client) {
3880                                 const DUID* duid = link_get_duid(link);
3881
3882                                 r = sd_dhcp6_client_set_mac(link->dhcp6_client,
3883                                                             (const uint8_t *) &link->mac,
3884                                                             sizeof (link->mac),
3885                                                             ARPHRD_ETHER);
3886                                 if (r < 0)
3887                                         return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
3888
3889                                 if (link->network->iaid_set) {
3890                                         r = sd_dhcp6_client_set_iaid(link->dhcp6_client,
3891                                                                      link->network->iaid);
3892                                         if (r < 0)
3893                                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
3894                                 }
3895
3896                                 r = sd_dhcp6_client_set_duid(link->dhcp6_client,
3897                                                              duid->type,
3898                                                              duid->raw_data_len > 0 ? duid->raw_data : NULL,
3899                                                              duid->raw_data_len);
3900                                 if (r < 0)
3901                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
3902                         }
3903
3904                         if (link->radv) {
3905                                 r = sd_radv_set_mac(link->radv, &link->mac);
3906                                 if (r < 0)
3907                                         return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
3908                         }
3909
3910                         if (link->ndisc) {
3911                                 r = sd_ndisc_set_mac(link->ndisc, &link->mac);
3912                                 if (r < 0)
3913                                         return log_link_warning_errno(link, r, "Could not update MAC for ndisc: %m");
3914                         }
3915                 }
3916         }
3917
3918         old_master = link->master_ifindex;
3919         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
3920
3921         link_was_admin_up = link->flags & IFF_UP;
3922         had_carrier = link_has_carrier(link);
3923
3924         r = link_update_flags(link, m, old_master != link->master_ifindex);
3925         if (r < 0)
3926                 return r;
3927
3928         if (!link_was_admin_up && (link->flags & IFF_UP)) {
3929                 log_link_info(link, "Link UP");
3930
3931                 r = link_admin_state_up(link);
3932                 if (r < 0)
3933                         return r;
3934         } else if (link_was_admin_up && !(link->flags & IFF_UP))
3935                 log_link_info(link, "Link DOWN");
3936
3937         r = link_update_lldp(link);
3938         if (r < 0)
3939                 return r;
3940
3941         carrier_gained = !had_carrier && link_has_carrier(link);
3942         carrier_lost = had_carrier && !link_has_carrier(link);
3943
3944         if (carrier_gained) {
3945                 log_link_info(link, "Gained carrier");
3946
3947                 r = link_carrier_gained(link);
3948                 if (r < 0)
3949                         return r;
3950         } else if (carrier_lost) {
3951                 log_link_info(link, "Lost carrier");
3952
3953                 r = link_carrier_lost(link);
3954                 if (r < 0)
3955                         return r;
3956         }
3957
3958         return 0;
3959 }
3960
3961 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
3962         bool space = false;
3963         Iterator i;
3964         Link *link;
3965
3966         assert(f);
3967         assert(prefix);
3968
3969         if (hashmap_isempty(h))
3970                 return;
3971
3972         fputs(prefix, f);
3973         HASHMAP_FOREACH(link, h, i) {
3974                 if (space)
3975                         fputc(' ', f);
3976
3977                 fprintf(f, "%i", link->ifindex);
3978                 space = true;
3979         }
3980
3981         fputc('\n', f);
3982 }
3983
3984 static void link_save_dns(FILE *f, struct in_addr_data *dns, unsigned n_dns, bool *space) {
3985         for (unsigned j = 0; j < n_dns; j++) {
3986                 _cleanup_free_ char *b = NULL;
3987                 int r;
3988
3989                 r = in_addr_to_string(dns[j].family, &dns[j].address, &b);
3990                 if (r < 0) {
3991                         log_debug_errno(r, "Failed to format address, ignoring: %m");
3992                         continue;
3993                 }
3994
3995                 if (*space)
3996                         fputc(' ', f);
3997                 fputs(b, f);
3998                 *space = true;
3999         }
4000 }
4001
4002 static void serialize_addresses(
4003                 FILE *f,
4004                 const char *lvalue,
4005                 bool *space,
4006                 char **addresses,
4007                 sd_dhcp_lease *lease,
4008                 bool conditional,
4009                 sd_dhcp_lease_info what,
4010                 sd_dhcp6_lease *lease6,
4011                 bool conditional6,
4012                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4013                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4014         int r;
4015
4016         bool _space = false;
4017         if (!space)
4018                 space = &_space;
4019
4020         if (lvalue)
4021                 fprintf(f, "%s=", lvalue);
4022         fputstrv(f, addresses, NULL, space);
4023
4024         if (lease && conditional) {
4025                 const struct in_addr *lease_addresses;
4026
4027                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4028                 if (r > 0)
4029                         if (serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local) > 0)
4030                                 *space = true;
4031         }
4032
4033         if (lease6 && conditional6 && lease6_get_addr) {
4034                 const struct in6_addr *in6_addrs;
4035
4036                 r = lease6_get_addr(lease6, &in6_addrs);
4037                 if (r > 0) {
4038                         if (*space)
4039                                 fputc(' ', f);
4040                         serialize_in6_addrs(f, in6_addrs, r);
4041                         *space = true;
4042                 }
4043         }
4044
4045         if (lease6 && conditional6 && lease6_get_fqdn) {
4046                 char **in6_hosts;
4047
4048                 r = lease6_get_fqdn(lease6, &in6_hosts);
4049                 if (r > 0)
4050                         fputstrv(f, in6_hosts, NULL, space);
4051         }
4052
4053         if (lvalue)
4054                 fputc('\n', f);
4055 }
4056
4057 int link_save(Link *link) {
4058         const char *admin_state, *oper_state, *carrier_state, *address_state;
4059         _cleanup_free_ char *temp_path = NULL;
4060         _cleanup_fclose_ FILE *f = NULL;
4061         Address *a;
4062         Route *route;
4063         Iterator i;
4064         int r;
4065
4066         assert(link);
4067         assert(link->state_file);
4068         assert(link->lease_file);
4069         assert(link->manager);
4070
4071         if (link->state == LINK_STATE_LINGER) {
4072                 (void) unlink(link->state_file);
4073                 return 0;
4074         }
4075
4076         link_lldp_save(link);
4077
4078         admin_state = link_state_to_string(link->state);
4079         assert(admin_state);
4080
4081         oper_state = link_operstate_to_string(link->operstate);
4082         assert(oper_state);
4083
4084         carrier_state = link_carrier_state_to_string(link->carrier_state);
4085         assert(carrier_state);
4086
4087         address_state = link_address_state_to_string(link->address_state);
4088         assert(address_state);
4089
4090         r = fopen_temporary(link->state_file, &f, &temp_path);
4091         if (r < 0)
4092                 goto fail;
4093
4094         (void) fchmod(fileno(f), 0644);
4095
4096         fprintf(f,
4097                 "# This is private data. Do not parse.\n"
4098                 "ADMIN_STATE=%s\n"
4099                 "OPER_STATE=%s\n"
4100                 "CARRIER_STATE=%s\n"
4101                 "ADDRESS_STATE=%s\n",
4102                 admin_state, oper_state, carrier_state, address_state);
4103
4104         if (link->network) {
4105                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4106                 const char *dhcp_domainname = NULL, *p;
4107                 sd_dhcp6_lease *dhcp6_lease = NULL;
4108                 bool space;
4109
4110                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4111                         yes_no(link->network->required_for_online));
4112
4113                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4114                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4115                         strempty(link_operstate_to_string(st.min)),
4116                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4117                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4118
4119                 if (link->dhcp6_client) {
4120                         r = sd_dhcp6_client_get_lease(link->dhcp6_client, &dhcp6_lease);
4121                         if (r < 0 && r != -ENOMSG)
4122                                 log_link_debug_errno(link, r, "Failed to get DHCPv6 lease: %m");
4123                 }
4124
4125                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4126
4127                 /************************************************************/
4128
4129                 fputs("DNS=", f);
4130                 space = false;
4131                 if (link->n_dns != (unsigned) -1)
4132                         link_save_dns(f, link->dns, link->n_dns, &space);
4133                 else
4134                         link_save_dns(f, link->network->dns, link->network->n_dns, &space);
4135
4136                 serialize_addresses(f, NULL, &space,
4137                                     NULL,
4138                                     link->dhcp_lease,
4139                                     link->network->dhcp_use_dns,
4140                                     SD_DHCP_LEASE_DNS_SERVERS,
4141                                     dhcp6_lease,
4142                                     link->network->dhcp6_use_dns,
4143                                     sd_dhcp6_lease_get_dns,
4144                                     NULL);
4145
4146                 /* Make sure to flush out old entries before we use the NDISC data */
4147                 ndisc_vacuum(link);
4148
4149                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4150                         NDiscRDNSS *dd;
4151
4152                         SET_FOREACH(dd, link->ndisc_rdnss, i) {
4153                                 if (space)
4154                                         fputc(' ', f);
4155
4156                                 serialize_in6_addrs(f, &dd->address, 1);
4157                                 space = true;
4158                         }
4159                 }
4160
4161                 fputc('\n', f);
4162
4163                 /************************************************************/
4164
4165                 serialize_addresses(f, "NTP", NULL,
4166                                     link->ntp ?: link->network->ntp,
4167                                     link->dhcp_lease,
4168                                     link->network->dhcp_use_ntp,
4169                                     SD_DHCP_LEASE_NTP_SERVERS,
4170                                     dhcp6_lease,
4171                                     link->network->dhcp6_use_ntp,
4172                                     sd_dhcp6_lease_get_ntp_addrs,
4173                                     sd_dhcp6_lease_get_ntp_fqdn);
4174
4175                 serialize_addresses(f, "SIP", NULL,
4176                                     link->network->sip,
4177                                     link->dhcp_lease,
4178                                     link->network->dhcp_use_sip,
4179                                     SD_DHCP_LEASE_SIP_SERVERS,
4180                                     false, NULL, NULL, NULL);
4181
4182                 serialize_addresses(f, "POP3_SERVERS", NULL,
4183                                     link->network->pop3,
4184                                     link->dhcp_lease,
4185                                     true,
4186                                     SD_DHCP_LEASE_POP3_SERVERS,
4187                                     false, NULL, NULL, NULL);
4188
4189                 serialize_addresses(f, "SMTP_SERVERS", NULL,
4190                                     link->network->smtp,
4191                                     link->dhcp_lease,
4192                                     true,
4193                                     SD_DHCP_LEASE_SMTP_SERVERS,
4194                                     false, NULL, NULL, NULL);
4195
4196                 serialize_addresses(f, "LPR_SERVERS", NULL,
4197                                     link->network->lpr,
4198                                     link->dhcp_lease,
4199                                     true,
4200                                     SD_DHCP_LEASE_LPR_SERVERS,
4201                                     false, NULL, NULL, NULL);
4202
4203                 /************************************************************/
4204
4205                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4206                         if (link->dhcp_lease) {
4207                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4208                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4209                         }
4210                         if (dhcp6_lease)
4211                                 (void) sd_dhcp6_lease_get_domains(dhcp6_lease, &dhcp6_domains);
4212                 }
4213
4214                 fputs("DOMAINS=", f);
4215                 space = false;
4216                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains, i)
4217                         fputs_with_space(f, p, NULL, &space);
4218
4219                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4220                         if (dhcp_domainname)
4221                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4222                         if (dhcp_domains)
4223                                 fputstrv(f, dhcp_domains, NULL, &space);
4224                         if (dhcp6_domains)
4225                                 fputstrv(f, dhcp6_domains, NULL, &space);
4226                 }
4227
4228                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4229                         NDiscDNSSL *dd;
4230
4231                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4232                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4233                 }
4234
4235                 fputc('\n', f);
4236
4237                 /************************************************************/
4238
4239                 fputs("ROUTE_DOMAINS=", f);
4240                 space = false;
4241                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains, i)
4242                         fputs_with_space(f, p, NULL, &space);
4243
4244                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4245                         if (dhcp_domainname)
4246                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4247                         if (dhcp_domains)
4248                                 fputstrv(f, dhcp_domains, NULL, &space);
4249                         if (dhcp6_domains)
4250                                 fputstrv(f, dhcp6_domains, NULL, &space);
4251                 }
4252
4253                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4254                         NDiscDNSSL *dd;
4255
4256                         SET_FOREACH(dd, link->ndisc_dnssl, i)
4257                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4258                 }
4259
4260                 fputc('\n', f);
4261
4262                 /************************************************************/
4263
4264                 fprintf(f, "LLMNR=%s\n",
4265                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4266
4267                 /************************************************************/
4268
4269                 fprintf(f, "MDNS=%s\n",
4270                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4271
4272                 /************************************************************/
4273
4274                 int dns_default_route =
4275                         link->dns_default_route >= 0 ? link->dns_default_route :
4276                         link->network->dns_default_route;
4277                 if (dns_default_route >= 0)
4278                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4279
4280                 /************************************************************/
4281
4282                 DnsOverTlsMode dns_over_tls_mode =
4283                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4284                         link->network->dns_over_tls_mode;
4285                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4286                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4287
4288                 /************************************************************/
4289
4290                 DnssecMode dnssec_mode =
4291                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4292                         link->network->dnssec_mode;
4293                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4294                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4295
4296                 /************************************************************/
4297
4298                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4299                 if (set_isempty(nta_anchors))
4300                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4301
4302                 if (!set_isempty(nta_anchors)) {
4303                         const char *n;
4304
4305                         fputs("DNSSEC_NTA=", f);
4306                         space = false;
4307                         SET_FOREACH(n, nta_anchors, i)
4308                                 fputs_with_space(f, n, NULL, &space);
4309                         fputc('\n', f);
4310                 }
4311
4312                 /************************************************************/
4313
4314                 fputs("ADDRESSES=", f);
4315                 space = false;
4316                 SET_FOREACH(a, link->addresses, i) {
4317                         _cleanup_free_ char *address_str = NULL;
4318
4319                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4320                         if (r < 0)
4321                                 goto fail;
4322
4323                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4324                         space = true;
4325                 }
4326                 fputc('\n', f);
4327
4328                 /************************************************************/
4329
4330                 fputs("ROUTES=", f);
4331                 space = false;
4332                 SET_FOREACH(route, link->routes, i) {
4333                         _cleanup_free_ char *route_str = NULL;
4334
4335                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4336                         if (r < 0)
4337                                 goto fail;
4338
4339                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4340                                 space ? " " : "", route_str,
4341                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4342                         space = true;
4343                 }
4344
4345                 fputc('\n', f);
4346         }
4347
4348         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4349         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4350
4351         if (link->dhcp_lease) {
4352                 struct in_addr address;
4353                 const char *tz = NULL;
4354
4355                 assert(link->network);
4356
4357                 r = sd_dhcp_lease_get_timezone(link->dhcp_lease, &tz);
4358                 if (r >= 0)
4359                         fprintf(f, "TIMEZONE=%s\n", tz);
4360
4361                 r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
4362                 if (r >= 0) {
4363                         fputs("DHCP4_ADDRESS=", f);
4364                         serialize_in_addrs(f, &address, 1, false, NULL);
4365                         fputc('\n', f);
4366                 }
4367
4368                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4369                 if (r < 0)
4370                         goto fail;
4371
4372                 fprintf(f,
4373                         "DHCP_LEASE=%s\n",
4374                         link->lease_file);
4375         } else
4376                 (void) unlink(link->lease_file);
4377
4378         if (link->ipv4ll) {
4379                 struct in_addr address;
4380
4381                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4382                 if (r >= 0) {
4383                         fputs("IPV4LL_ADDRESS=", f);
4384                         serialize_in_addrs(f, &address, 1, false, NULL);
4385                         fputc('\n', f);
4386                 }
4387         }
4388
4389         r = fflush_and_check(f);
4390         if (r < 0)
4391                 goto fail;
4392
4393         if (rename(temp_path, link->state_file) < 0) {
4394                 r = -errno;
4395                 goto fail;
4396         }
4397
4398         return 0;
4399
4400 fail:
4401         (void) unlink(link->state_file);
4402         if (temp_path)
4403                 (void) unlink(temp_path);
4404
4405         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4406 }
4407
4408 /* The serialized state in /run is no longer up-to-date. */
4409 void link_dirty(Link *link) {
4410         int r;
4411
4412         assert(link);
4413
4414         /* mark manager dirty as link is dirty */
4415         manager_dirty(link->manager);
4416
4417         r = set_ensure_allocated(&link->manager->dirty_links, NULL);
4418         if (r < 0)
4419                 /* allocation errors are ignored */
4420                 return;
4421
4422         r = set_put(link->manager->dirty_links, link);
4423         if (r <= 0)
4424                 /* don't take another ref if the link was already dirty */
4425                 return;
4426
4427         link_ref(link);
4428 }
4429
4430 /* The serialized state in /run is up-to-date */
4431 void link_clean(Link *link) {
4432         assert(link);
4433         assert(link->manager);
4434
4435         link_unref(set_remove(link->manager->dirty_links, link));
4436 }
4437
4438 static const char* const link_state_table[_LINK_STATE_MAX] = {
4439         [LINK_STATE_PENDING] = "pending",
4440         [LINK_STATE_INITIALIZED] = "initialized",
4441         [LINK_STATE_CONFIGURING] = "configuring",
4442         [LINK_STATE_CONFIGURED] = "configured",
4443         [LINK_STATE_UNMANAGED] = "unmanaged",
4444         [LINK_STATE_FAILED] = "failed",
4445         [LINK_STATE_LINGER] = "linger",
4446 };
4447
4448 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4449
4450 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4451         const char *err_msg = NULL;
4452
4453         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4454         return log_link_full(link, level, err,
4455                              "%s: %s%s%s%m",
4456                              msg,
4457                              strempty(err_msg),
4458                              err_msg && !endswith(err_msg, ".") ? "." : "",
4459                              err_msg ? " " : "");
4460 }