src/network/networkd-link.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <netinet/in.h>
   4 #include <linux/if.h>
   5 #include <linux/if_arp.h>
   6 #include <linux/if_link.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "bond.h"
  11 #include "bridge.h"
  12 #include "bus-util.h"
  13 #include "dhcp-identifier.h"
  14 #include "dhcp-lease-internal.h"
  15 #include "env-file.h"
  16 #include "ethtool-util.h"
  17 #include "fd-util.h"
  18 #include "fileio.h"
  19 #include "ipvlan.h"
  20 #include "missing_network.h"
  21 #include "netlink-util.h"
  22 #include "network-internal.h"
  23 #include "networkd-can.h"
  24 #include "networkd-dhcp-server.h"
  25 #include "networkd-dhcp4.h"
  26 #include "networkd-dhcp6.h"
  27 #include "networkd-ipv4ll.h"
  28 #include "networkd-ipv6-proxy-ndp.h"
  29 #include "networkd-link-bus.h"
  30 #include "networkd-link.h"
  31 #include "networkd-lldp-tx.h"
  32 #include "networkd-manager.h"
  33 #include "networkd-ndisc.h"
  34 #include "networkd-neighbor.h"
  35 #include "networkd-sriov.h"
  36 #include "networkd-radv.h"
  37 #include "networkd-routing-policy-rule.h"
  38 #include "networkd-wifi.h"
  39 #include "set.h"
  40 #include "socket-util.h"
  41 #include "stat-util.h"
  42 #include "stdio-util.h"
  43 #include "string-table.h"
  44 #include "strv.h"
  45 #include "sysctl-util.h"
  46 #include "tc.h"
  47 #include "tmpfile-util.h"
  48 #include "udev-util.h"
  49 #include "util.h"
  50 #include "vrf.h"
  51
  52 uint32_t link_get_vrf_table(Link *link) {
  53         return link->network->vrf ? VRF(link->network->vrf)->table : RT_TABLE_MAIN;
  54 }
  55
  56 uint32_t link_get_dhcp_route_table(Link *link) {
  57         /* When the interface is part of an VRF use the VRFs routing table, unless
  58          * another table is explicitly specified. */
  59         if (link->network->dhcp_route_table_set)
  60                 return link->network->dhcp_route_table;
  61         return link_get_vrf_table(link);
  62 }
  63
  64 uint32_t link_get_ipv6_accept_ra_route_table(Link *link) {
  65         if (link->network->ipv6_accept_ra_route_table_set)
  66                 return link->network->ipv6_accept_ra_route_table;
  67         return link_get_vrf_table(link);
  68 }
  69
  70 DUID* link_get_duid(Link *link) {
  71         if (link->network->duid.type != _DUID_TYPE_INVALID)
  72                 return &link->network->duid;
  73         else
  74                 return &link->manager->duid;
  75 }
  76
  77 static bool link_dhcp6_enabled(Link *link) {
  78         assert(link);
  79
  80         if (!socket_ipv6_is_supported())
  81                 return false;
  82
  83         if (link->flags & IFF_LOOPBACK)
  84                 return false;
  85
  86         if (!link->network)
  87                 return false;
  88
  89         if (link->network->bond)
  90                 return false;
  91
  92         if (link->iftype == ARPHRD_CAN)
  93                 return false;
  94
  95         return link->network->dhcp & ADDRESS_FAMILY_IPV6;
  96 }
  97
  98 static bool link_dhcp4_enabled(Link *link) {
  99         assert(link);
 100
 101         if (link->flags & IFF_LOOPBACK)
 102                 return false;
 103
 104         if (!link->network)
 105                 return false;
 106
 107         if (link->network->bond)
 108                 return false;
 109
 110         if (link->iftype == ARPHRD_CAN)
 111                 return false;
 112
 113         return link->network->dhcp & ADDRESS_FAMILY_IPV4;
 114 }
 115
 116 static bool link_dhcp4_server_enabled(Link *link) {
 117         assert(link);
 118
 119         if (link->flags & IFF_LOOPBACK)
 120                 return false;
 121
 122         if (!link->network)
 123                 return false;
 124
 125         if (link->network->bond)
 126                 return false;
 127
 128         if (link->iftype == ARPHRD_CAN)
 129                 return false;
 130
 131         return link->network->dhcp_server;
 132 }
 133
 134 bool link_ipv4ll_enabled(Link *link, AddressFamily mask) {
 135         assert(link);
 136         assert((mask & ~(ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) == 0);
 137
 138         if (link->flags & IFF_LOOPBACK)
 139                 return false;
 140
 141         if (!link->network)
 142                 return false;
 143
 144         if (link->iftype == ARPHRD_CAN)
 145                 return false;
 146
 147         if (STRPTR_IN_SET(link->kind,
 148                           "vrf", "wireguard", "ipip", "gre", "ip6gre","ip6tnl", "sit", "vti",
 149                           "vti6", "nlmon", "xfrm"))
 150                 return false;
 151
 152         /* L3 or L3S mode do not support ARP. */
 153         if (IN_SET(link_get_ipvlan_mode(link), NETDEV_IPVLAN_MODE_L3, NETDEV_IPVLAN_MODE_L3S))
 154                 return false;
 155
 156         if (link->network->bond)
 157                 return false;
 158
 159         return link->network->link_local & mask;
 160 }
 161
 162 static bool link_ipv6ll_enabled(Link *link) {
 163         assert(link);
 164
 165         if (!socket_ipv6_is_supported())
 166                 return false;
 167
 168         if (link->flags & IFF_LOOPBACK)
 169                 return false;
 170
 171         if (!link->network)
 172                 return false;
 173
 174         if (link->iftype == ARPHRD_CAN)
 175                 return false;
 176
 177         if (STRPTR_IN_SET(link->kind, "vrf", "wireguard", "ipip", "gre", "sit", "vti", "nlmon"))
 178                 return false;
 179
 180         if (link->network->bond)
 181                 return false;
 182
 183         return link->network->link_local & ADDRESS_FAMILY_IPV6;
 184 }
 185
 186 static bool link_ipv6_enabled(Link *link) {
 187         assert(link);
 188
 189         if (!socket_ipv6_is_supported())
 190                 return false;
 191
 192         if (link->network->bond)
 193                 return false;
 194
 195         if (link->iftype == ARPHRD_CAN)
 196                 return false;
 197
 198         /* DHCPv6 client will not be started if no IPv6 link-local address is configured. */
 199         if (link_ipv6ll_enabled(link))
 200                 return true;
 201
 202         if (network_has_static_ipv6_configurations(link->network))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static bool link_radv_enabled(Link *link) {
 209         assert(link);
 210
 211         if (!link_ipv6ll_enabled(link))
 212                 return false;
 213
 214         return link->network->router_prefix_delegation != RADV_PREFIX_DELEGATION_NONE;
 215 }
 216
 217 static bool link_ipv4_forward_enabled(Link *link) {
 218         assert(link);
 219
 220         if (link->flags & IFF_LOOPBACK)
 221                 return false;
 222
 223         if (!link->network)
 224                 return false;
 225
 226         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 227                 return false;
 228
 229         return link->network->ip_forward & ADDRESS_FAMILY_IPV4;
 230 }
 231
 232 static bool link_ipv6_forward_enabled(Link *link) {
 233         assert(link);
 234
 235         if (!socket_ipv6_is_supported())
 236                 return false;
 237
 238         if (link->flags & IFF_LOOPBACK)
 239                 return false;
 240
 241         if (!link->network)
 242                 return false;
 243
 244         if (link->network->ip_forward == _ADDRESS_FAMILY_INVALID)
 245                 return false;
 246
 247         return link->network->ip_forward & ADDRESS_FAMILY_IPV6;
 248 }
 249
 250 static bool link_proxy_arp_enabled(Link *link) {
 251         assert(link);
 252
 253         if (link->flags & IFF_LOOPBACK)
 254                 return false;
 255
 256         if (!link->network)
 257                 return false;
 258
 259         if (link->network->proxy_arp < 0)
 260                 return false;
 261
 262         return true;
 263 }
 264
 265 static bool link_ipv6_accept_ra_enabled(Link *link) {
 266         assert(link);
 267
 268         if (!socket_ipv6_is_supported())
 269                 return false;
 270
 271         if (link->flags & IFF_LOOPBACK)
 272                 return false;
 273
 274         if (!link->network)
 275                 return false;
 276
 277         if (!link_ipv6ll_enabled(link))
 278                 return false;
 279
 280         /* If unset use system default (enabled if local forwarding is disabled.
 281          * disabled if local forwarding is enabled).
 282          * If set, ignore or enforce RA independent of local forwarding state.
 283          */
 284         if (link->network->ipv6_accept_ra < 0)
 285                 /* default to accept RA if ip_forward is disabled and ignore RA if ip_forward is enabled */
 286                 return !link_ipv6_forward_enabled(link);
 287         else if (link->network->ipv6_accept_ra > 0)
 288                 /* accept RA even if ip_forward is enabled */
 289                 return true;
 290         else
 291                 /* ignore RA */
 292                 return false;
 293 }
 294
 295 static IPv6PrivacyExtensions link_ipv6_privacy_extensions(Link *link) {
 296         assert(link);
 297
 298         if (!socket_ipv6_is_supported())
 299                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 300
 301         if (link->flags & IFF_LOOPBACK)
 302                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 303
 304         if (!link->network)
 305                 return _IPV6_PRIVACY_EXTENSIONS_INVALID;
 306
 307         return link->network->ipv6_privacy_extensions;
 308 }
 309
 310 static int link_update_ipv6_sysctl(Link *link) {
 311         bool enabled;
 312         int r;
 313
 314         if (link->flags & IFF_LOOPBACK)
 315                 return 0;
 316
 317         enabled = link_ipv6_enabled(link);
 318         if (enabled) {
 319                 r = sysctl_write_ip_property_boolean(AF_INET6, link->ifname, "disable_ipv6", false);
 320                 if (r < 0)
 321                         return log_link_warning_errno(link, r, "Cannot enable IPv6: %m");
 322
 323                 log_link_info(link, "IPv6 successfully enabled");
 324         }
 325
 326         return 0;
 327 }
 328
 329 static bool link_is_enslaved(Link *link) {
 330         if (link->flags & IFF_SLAVE)
 331                 /* Even if the link is not managed by networkd, honor IFF_SLAVE flag. */
 332                 return true;
 333
 334         if (!link->network)
 335                 return false;
 336
 337         if (link->master_ifindex > 0 && link->network->bridge)
 338                 return true;
 339
 340         /* TODO: add conditions for other netdevs. */
 341
 342         return false;
 343 }
 344
 345 static void link_update_master_operstate(Link *link, NetDev *netdev) {
 346         Link *master;
 347
 348         if (!netdev)
 349                 return;
 350
 351         if (netdev->ifindex <= 0)
 352                 return;
 353
 354         if (link_get(link->manager, netdev->ifindex, &master) < 0)
 355                 return;
 356
 357         link_update_operstate(master, true);
 358 }
 359
 360 void link_update_operstate(Link *link, bool also_update_master) {
 361         LinkOperationalState operstate;
 362         LinkCarrierState carrier_state;
 363         LinkAddressState address_state;
 364         _cleanup_strv_free_ char **p = NULL;
 365         uint8_t scope = RT_SCOPE_NOWHERE;
 366         bool changed = false;
 367         Address *address;
 368
 369         assert(link);
 370
 371         if (link->kernel_operstate == IF_OPER_DORMANT)
 372                 carrier_state = LINK_CARRIER_STATE_DORMANT;
 373         else if (link_has_carrier(link)) {
 374                 if (link_is_enslaved(link))
 375                         carrier_state = LINK_CARRIER_STATE_ENSLAVED;
 376                 else
 377                         carrier_state = LINK_CARRIER_STATE_CARRIER;
 378         } else if (link->flags & IFF_UP)
 379                 carrier_state = LINK_CARRIER_STATE_NO_CARRIER;
 380         else
 381                 carrier_state = LINK_CARRIER_STATE_OFF;
 382
 383         if (carrier_state >= LINK_CARRIER_STATE_CARRIER) {
 384                 Link *slave;
 385
 386                 SET_FOREACH(slave, link->slaves) {
 387                         link_update_operstate(slave, false);
 388
 389                         if (slave->carrier_state < LINK_CARRIER_STATE_CARRIER)
 390                                 carrier_state = LINK_CARRIER_STATE_DEGRADED_CARRIER;
 391                 }
 392         }
 393
 394         SET_FOREACH(address, link->addresses) {
 395                 if (!address_is_ready(address))
 396                         continue;
 397
 398                 if (address->scope < scope)
 399                         scope = address->scope;
 400         }
 401
 402         /* for operstate we also take foreign addresses into account */
 403         SET_FOREACH(address, link->addresses_foreign) {
 404                 if (!address_is_ready(address))
 405                         continue;
 406
 407                 if (address->scope < scope)
 408                         scope = address->scope;
 409         }
 410
 411         if (scope < RT_SCOPE_SITE)
 412                 /* universally accessible addresses found */
 413                 address_state = LINK_ADDRESS_STATE_ROUTABLE;
 414         else if (scope < RT_SCOPE_HOST)
 415                 /* only link or site local addresses found */
 416                 address_state = LINK_ADDRESS_STATE_DEGRADED;
 417         else
 418                 /* no useful addresses found */
 419                 address_state = LINK_ADDRESS_STATE_OFF;
 420
 421         /* Mapping of address and carrier state vs operational state
 422          *                                                     carrier state
 423          *                          | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 424          *                 ------------------------------------------------------------------------------
 425          *                 off      | off | no-carrier | dormant | degraded-carrier | carrier  | enslaved
 426          * address_state   degraded | off | no-carrier | dormant | degraded-carrier | degraded | enslaved
 427          *                 routable | off | no-carrier | dormant | degraded-carrier | routable | routable
 428          */
 429
 430         if (carrier_state < LINK_CARRIER_STATE_CARRIER || address_state == LINK_ADDRESS_STATE_OFF)
 431                 operstate = (LinkOperationalState) carrier_state;
 432         else if (address_state == LINK_ADDRESS_STATE_ROUTABLE)
 433                 operstate = LINK_OPERSTATE_ROUTABLE;
 434         else if (carrier_state == LINK_CARRIER_STATE_CARRIER)
 435                 operstate = LINK_OPERSTATE_DEGRADED;
 436         else
 437                 operstate = LINK_OPERSTATE_ENSLAVED;
 438
 439         if (link->carrier_state != carrier_state) {
 440                 link->carrier_state = carrier_state;
 441                 changed = true;
 442                 if (strv_extend(&p, "CarrierState") < 0)
 443                         log_oom();
 444         }
 445
 446         if (link->address_state != address_state) {
 447                 link->address_state = address_state;
 448                 changed = true;
 449                 if (strv_extend(&p, "AddressState") < 0)
 450                         log_oom();
 451         }
 452
 453         if (link->operstate != operstate) {
 454                 link->operstate = operstate;
 455                 changed = true;
 456                 if (strv_extend(&p, "OperationalState") < 0)
 457                         log_oom();
 458         }
 459
 460         if (p)
 461                 link_send_changed_strv(link, p);
 462         if (changed)
 463                 link_dirty(link);
 464
 465         if (also_update_master && link->network) {
 466                 link_update_master_operstate(link, link->network->bond);
 467                 link_update_master_operstate(link, link->network->bridge);
 468         }
 469 }
 470
 471 #define FLAG_STRING(string, flag, old, new) \
 472         (((old ^ new) & flag) \
 473                 ? ((old & flag) ? (" -" string) : (" +" string)) \
 474                 : "")
 475
 476 static int link_update_flags(Link *link, sd_netlink_message *m, bool force_update_operstate) {
 477         unsigned flags, unknown_flags_added, unknown_flags_removed, unknown_flags;
 478         uint8_t operstate;
 479         int r;
 480
 481         assert(link);
 482
 483         r = sd_rtnl_message_link_get_flags(m, &flags);
 484         if (r < 0)
 485                 return log_link_warning_errno(link, r, "Could not get link flags: %m");
 486
 487         r = sd_netlink_message_read_u8(m, IFLA_OPERSTATE, &operstate);
 488         if (r < 0)
 489                 /* if we got a message without operstate, take it to mean
 490                    the state was unchanged */
 491                 operstate = link->kernel_operstate;
 492
 493         if (!force_update_operstate && (link->flags == flags) && (link->kernel_operstate == operstate))
 494                 return 0;
 495
 496         if (link->flags != flags) {
 497                 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",
 498                                FLAG_STRING("LOOPBACK", IFF_LOOPBACK, link->flags, flags),
 499                                FLAG_STRING("MASTER", IFF_MASTER, link->flags, flags),
 500                                FLAG_STRING("SLAVE", IFF_SLAVE, link->flags, flags),
 501                                FLAG_STRING("UP", IFF_UP, link->flags, flags),
 502                                FLAG_STRING("DORMANT", IFF_DORMANT, link->flags, flags),
 503                                FLAG_STRING("LOWER_UP", IFF_LOWER_UP, link->flags, flags),
 504                                FLAG_STRING("RUNNING", IFF_RUNNING, link->flags, flags),
 505                                FLAG_STRING("MULTICAST", IFF_MULTICAST, link->flags, flags),
 506                                FLAG_STRING("BROADCAST", IFF_BROADCAST, link->flags, flags),
 507                                FLAG_STRING("POINTOPOINT", IFF_POINTOPOINT, link->flags, flags),
 508                                FLAG_STRING("PROMISC", IFF_PROMISC, link->flags, flags),
 509                                FLAG_STRING("ALLMULTI", IFF_ALLMULTI, link->flags, flags),
 510                                FLAG_STRING("PORTSEL", IFF_PORTSEL, link->flags, flags),
 511                                FLAG_STRING("AUTOMEDIA", IFF_AUTOMEDIA, link->flags, flags),
 512                                FLAG_STRING("DYNAMIC", IFF_DYNAMIC, link->flags, flags),
 513                                FLAG_STRING("NOARP", IFF_NOARP, link->flags, flags),
 514                                FLAG_STRING("NOTRAILERS", IFF_NOTRAILERS, link->flags, flags),
 515                                FLAG_STRING("DEBUG", IFF_DEBUG, link->flags, flags),
 516                                FLAG_STRING("ECHO", IFF_ECHO, link->flags, flags));
 517
 518                 unknown_flags = ~(IFF_LOOPBACK | IFF_MASTER | IFF_SLAVE | IFF_UP |
 519                                   IFF_DORMANT | IFF_LOWER_UP | IFF_RUNNING |
 520                                   IFF_MULTICAST | IFF_BROADCAST | IFF_POINTOPOINT |
 521                                   IFF_PROMISC | IFF_ALLMULTI | IFF_PORTSEL |
 522                                   IFF_AUTOMEDIA | IFF_DYNAMIC | IFF_NOARP |
 523                                   IFF_NOTRAILERS | IFF_DEBUG | IFF_ECHO);
 524                 unknown_flags_added = ((link->flags ^ flags) & flags & unknown_flags);
 525                 unknown_flags_removed = ((link->flags ^ flags) & link->flags & unknown_flags);
 526
 527                 /* link flags are currently at most 18 bits, let's align to
 528                  * printing 20 */
 529                 if (unknown_flags_added)
 530                         log_link_debug(link,
 531                                        "Unknown link flags gained: %#.5x (ignoring)",
 532                                        unknown_flags_added);
 533
 534                 if (unknown_flags_removed)
 535                         log_link_debug(link,
 536                                        "Unknown link flags lost: %#.5x (ignoring)",
 537                                        unknown_flags_removed);
 538         }
 539
 540         link->flags = flags;
 541         link->kernel_operstate = operstate;
 542
 543         link_update_operstate(link, true);
 544
 545         return 0;
 546 }
 547
 548 static int link_new(Manager *manager, sd_netlink_message *message, Link **ret) {
 549         _cleanup_(link_unrefp) Link *link = NULL;
 550         const char *ifname, *kind = NULL;
 551         unsigned short iftype;
 552         int r, ifindex;
 553         uint16_t type;
 554
 555         assert(manager);
 556         assert(message);
 557         assert(ret);
 558
 559         /* check for link kind */
 560         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 561         if (r == 0) {
 562                 (void) sd_netlink_message_read_string(message, IFLA_INFO_KIND, &kind);
 563                 r = sd_netlink_message_exit_container(message);
 564                 if (r < 0)
 565                         return r;
 566         }
 567
 568         r = sd_netlink_message_get_type(message, &type);
 569         if (r < 0)
 570                 return r;
 571         else if (type != RTM_NEWLINK)
 572                 return -EINVAL;
 573
 574         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 575         if (r < 0)
 576                 return r;
 577         else if (ifindex <= 0)
 578                 return -EINVAL;
 579
 580         r = sd_rtnl_message_link_get_type(message, &iftype);
 581         if (r < 0)
 582                 return r;
 583
 584         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &ifname);
 585         if (r < 0)
 586                 return r;
 587
 588         link = new(Link, 1);
 589         if (!link)
 590                 return -ENOMEM;
 591
 592         *link = (Link) {
 593                 .n_ref = 1,
 594                 .manager = manager,
 595                 .state = LINK_STATE_PENDING,
 596                 .ifindex = ifindex,
 597                 .iftype = iftype,
 598
 599                 .n_dns = (unsigned) -1,
 600                 .dns_default_route = -1,
 601                 .llmnr = _RESOLVE_SUPPORT_INVALID,
 602                 .mdns = _RESOLVE_SUPPORT_INVALID,
 603                 .dnssec_mode = _DNSSEC_MODE_INVALID,
 604                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
 605         };
 606
 607         link->ifname = strdup(ifname);
 608         if (!link->ifname)
 609                 return -ENOMEM;
 610
 611         if (kind) {
 612                 link->kind = strdup(kind);
 613                 if (!link->kind)
 614                         return -ENOMEM;
 615         }
 616
 617         r = sd_netlink_message_read_u32(message, IFLA_MASTER, (uint32_t *)&link->master_ifindex);
 618         if (r < 0)
 619                 log_link_debug_errno(link, r, "New device has no master, continuing without");
 620
 621         r = sd_netlink_message_read_ether_addr(message, IFLA_ADDRESS, &link->mac);
 622         if (r < 0)
 623                 log_link_debug_errno(link, r, "MAC address not found for new device, continuing without");
 624
 625         r = ethtool_get_permanent_macaddr(&manager->ethtool_fd, link->ifname, &link->permanent_mac);
 626         if (r < 0)
 627                 log_link_debug_errno(link, r, "Permanent MAC address not found for new device, continuing without: %m");
 628
 629         r = ethtool_get_driver(&manager->ethtool_fd, link->ifname, &link->driver);
 630         if (r < 0)
 631                 log_link_debug_errno(link, r, "Failed to get driver, continuing without: %m");
 632
 633         r = sd_netlink_message_read_strv(message, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &link->alternative_names);
 634         if (r < 0 && r != -ENODATA)
 635                 return r;
 636
 637         if (asprintf(&link->state_file, "/run/systemd/netif/links/%d", link->ifindex) < 0)
 638                 return -ENOMEM;
 639
 640         if (asprintf(&link->lease_file, "/run/systemd/netif/leases/%d", link->ifindex) < 0)
 641                 return -ENOMEM;
 642
 643         if (asprintf(&link->lldp_file, "/run/systemd/netif/lldp/%d", link->ifindex) < 0)
 644                 return -ENOMEM;
 645
 646         r = hashmap_ensure_allocated(&manager->links, NULL);
 647         if (r < 0)
 648                 return r;
 649
 650         r = hashmap_put(manager->links, INT_TO_PTR(link->ifindex), link);
 651         if (r < 0)
 652                 return r;
 653
 654         r = link_update_flags(link, message, false);
 655         if (r < 0)
 656                 return r;
 657
 658         *ret = TAKE_PTR(link);
 659
 660         return 0;
 661 }
 662
 663 void link_ntp_settings_clear(Link *link) {
 664         link->ntp = strv_free(link->ntp);
 665 }
 666
 667 void link_dns_settings_clear(Link *link) {
 668         if (link->n_dns != (unsigned) -1)
 669                 for (unsigned i = 0; i < link->n_dns; i++)
 670                         in_addr_full_free(link->dns[i]);
 671         link->dns = mfree(link->dns);
 672         link->n_dns = (unsigned) -1;
 673
 674         link->search_domains = ordered_set_free_free(link->search_domains);
 675         link->route_domains = ordered_set_free_free(link->route_domains);
 676
 677         link->dns_default_route = -1;
 678         link->llmnr = _RESOLVE_SUPPORT_INVALID;
 679         link->mdns = _RESOLVE_SUPPORT_INVALID;
 680         link->dnssec_mode = _DNSSEC_MODE_INVALID;
 681         link->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 682
 683         link->dnssec_negative_trust_anchors = set_free_free(link->dnssec_negative_trust_anchors);
 684 }
 685
 686 static void link_free_engines(Link *link) {
 687         if (!link)
 688                 return;
 689
 690         link->dhcp_server = sd_dhcp_server_unref(link->dhcp_server);
 691         link->dhcp_client = sd_dhcp_client_unref(link->dhcp_client);
 692         link->dhcp_lease = sd_dhcp_lease_unref(link->dhcp_lease);
 693
 694         link->lldp = sd_lldp_unref(link->lldp);
 695
 696         ndisc_flush(link);
 697
 698         link->ipv4ll = sd_ipv4ll_unref(link->ipv4ll);
 699         link->dhcp6_client = sd_dhcp6_client_unref(link->dhcp6_client);
 700         link->dhcp6_lease = sd_dhcp6_lease_unref(link->dhcp6_lease);
 701         link->ndisc = sd_ndisc_unref(link->ndisc);
 702         link->radv = sd_radv_unref(link->radv);
 703 }
 704
 705 static Link *link_free(Link *link) {
 706         Address *address;
 707
 708         assert(link);
 709
 710         link_ntp_settings_clear(link);
 711         link_dns_settings_clear(link);
 712
 713         link->routes = set_free(link->routes);
 714         link->routes_foreign = set_free(link->routes_foreign);
 715         link->dhcp_routes = set_free(link->dhcp_routes);
 716         link->dhcp_routes_old = set_free(link->dhcp_routes_old);
 717         link->dhcp6_routes = set_free(link->dhcp6_routes);
 718         link->dhcp6_routes_old = set_free(link->dhcp6_routes_old);
 719         link->dhcp6_pd_routes = set_free(link->dhcp6_pd_routes);
 720         link->dhcp6_pd_routes_old = set_free(link->dhcp6_pd_routes_old);
 721         link->ndisc_routes = set_free(link->ndisc_routes);
 722
 723         link->nexthops = set_free(link->nexthops);
 724         link->nexthops_foreign = set_free(link->nexthops_foreign);
 725
 726         link->neighbors = set_free(link->neighbors);
 727         link->neighbors_foreign = set_free(link->neighbors_foreign);
 728
 729         link->addresses = set_free(link->addresses);
 730         link->addresses_foreign = set_free(link->addresses_foreign);
 731         link->static_addresses = set_free(link->static_addresses);
 732         link->dhcp6_addresses = set_free(link->dhcp6_addresses);
 733         link->dhcp6_addresses_old = set_free(link->dhcp6_addresses_old);
 734         link->dhcp6_pd_addresses = set_free(link->dhcp6_pd_addresses);
 735         link->dhcp6_pd_addresses_old = set_free(link->dhcp6_pd_addresses_old);
 736         link->ndisc_addresses = set_free(link->ndisc_addresses);
 737
 738         while ((address = link->pool_addresses)) {
 739                 LIST_REMOVE(addresses, link->pool_addresses, address);
 740                 address_free(address);
 741         }
 742
 743         link_lldp_emit_stop(link);
 744         link_free_engines(link);
 745         free(link->lease_file);
 746         free(link->lldp_file);
 747
 748         free(link->ifname);
 749         strv_free(link->alternative_names);
 750         free(link->kind);
 751         free(link->ssid);
 752         free(link->driver);
 753
 754         (void) unlink(link->state_file);
 755         free(link->state_file);
 756
 757         sd_device_unref(link->sd_device);
 758
 759         hashmap_free(link->bound_to_links);
 760         hashmap_free(link->bound_by_links);
 761
 762         set_free_with_destructor(link->slaves, link_unref);
 763
 764         network_unref(link->network);
 765
 766         return mfree(link);
 767 }
 768
 769 DEFINE_TRIVIAL_REF_UNREF_FUNC(Link, link, link_free);
 770
 771 int link_get(Manager *m, int ifindex, Link **ret) {
 772         Link *link;
 773
 774         assert(m);
 775         assert(ifindex > 0);
 776         assert(ret);
 777
 778         link = hashmap_get(m->links, INT_TO_PTR(ifindex));
 779         if (!link)
 780                 return -ENODEV;
 781
 782         *ret = link;
 783
 784         return 0;
 785 }
 786
 787 void link_set_state(Link *link, LinkState state) {
 788         assert(link);
 789
 790         if (link->state == state)
 791                 return;
 792
 793         log_link_debug(link, "State changed: %s -> %s",
 794                        link_state_to_string(link->state),
 795                        link_state_to_string(state));
 796
 797         link->state = state;
 798
 799         link_send_changed(link, "AdministrativeState", NULL);
 800 }
 801
 802 static void link_enter_unmanaged(Link *link) {
 803         assert(link);
 804
 805         link_set_state(link, LINK_STATE_UNMANAGED);
 806
 807         link_dirty(link);
 808 }
 809
 810 int link_stop_clients(Link *link, bool may_keep_dhcp) {
 811         int r = 0, k;
 812         Address *ad;
 813
 814         assert(link);
 815         assert(link->manager);
 816         assert(link->manager->event);
 817
 818         bool keep_dhcp = may_keep_dhcp &&
 819                          link->network &&
 820                          (link->manager->restarting ||
 821                           FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP_ON_STOP));
 822
 823         if (link->dhcp_client && !keep_dhcp) {
 824                 k = sd_dhcp_client_stop(link->dhcp_client);
 825                 if (k < 0)
 826                         r = log_link_warning_errno(link, k, "Could not stop DHCPv4 client: %m");
 827         }
 828
 829         if (link->ipv4ll) {
 830                 k = sd_ipv4ll_stop(link->ipv4ll);
 831                 if (k < 0)
 832                         r = log_link_warning_errno(link, k, "Could not stop IPv4 link-local: %m");
 833         }
 834
 835         if (link->network)
 836                 LIST_FOREACH(addresses, ad, link->network->static_addresses)
 837                         if (ad->acd && sd_ipv4acd_is_running(ad->acd) == 0) {
 838                                 k = sd_ipv4acd_stop(ad->acd);
 839                                 if (k < 0)
 840                                         r = log_link_warning_errno(link, k, "Could not stop IPv4 ACD client: %m");
 841                         }
 842
 843         if (link->dhcp6_client) {
 844                 k = sd_dhcp6_client_stop(link->dhcp6_client);
 845                 if (k < 0)
 846                         r = log_link_warning_errno(link, k, "Could not stop DHCPv6 client: %m");
 847         }
 848
 849         if (link_dhcp6_pd_is_enabled(link)) {
 850                 k = dhcp6_pd_remove(link);
 851                 if (k < 0)
 852                         r = log_link_warning_errno(link, k, "Could not remove DHCPv6 PD addresses and routes: %m");
 853         }
 854
 855         if (link->ndisc) {
 856                 k = sd_ndisc_stop(link->ndisc);
 857                 if (k < 0)
 858                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Discovery: %m");
 859         }
 860
 861         if (link->radv) {
 862                 k = sd_radv_stop(link->radv);
 863                 if (k < 0)
 864                         r = log_link_warning_errno(link, k, "Could not stop IPv6 Router Advertisement: %m");
 865         }
 866
 867         link_lldp_emit_stop(link);
 868         return r;
 869 }
 870
 871 void link_enter_failed(Link *link) {
 872         assert(link);
 873
 874         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 875                 return;
 876
 877         log_link_warning(link, "Failed");
 878
 879         link_set_state(link, LINK_STATE_FAILED);
 880
 881         link_stop_clients(link, false);
 882
 883         link_dirty(link);
 884 }
 885
 886 static int link_join_netdevs_after_configured(Link *link) {
 887         NetDev *netdev;
 888         int r;
 889
 890         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
 891                 if (netdev->ifindex > 0)
 892                         /* Assume already enslaved. */
 893                         continue;
 894
 895                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_AFTER_CONFIGURED)
 896                         continue;
 897
 898                 log_struct(LOG_DEBUG,
 899                            LOG_LINK_INTERFACE(link),
 900                            LOG_NETDEV_INTERFACE(netdev),
 901                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
 902
 903                 r = netdev_join(netdev, link, NULL);
 904                 if (r < 0)
 905                         return log_struct_errno(LOG_WARNING, r,
 906                                                 LOG_LINK_INTERFACE(link),
 907                                                 LOG_NETDEV_INTERFACE(netdev),
 908                                                 LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
 909         }
 910
 911         return 0;
 912 }
 913
 914 static void link_enter_configured(Link *link) {
 915         assert(link);
 916         assert(link->network);
 917
 918         if (link->state != LINK_STATE_CONFIGURING)
 919                 return;
 920
 921         link_set_state(link, LINK_STATE_CONFIGURED);
 922
 923         (void) link_join_netdevs_after_configured(link);
 924
 925         link_dirty(link);
 926 }
 927
 928 static int link_request_set_routing_policy_rule(Link *link) {
 929         RoutingPolicyRule *rule, *rrule = NULL;
 930         int r;
 931
 932         assert(link);
 933         assert(link->network);
 934
 935         link->routing_policy_rules_configured = false;
 936
 937         LIST_FOREACH(rules, rule, link->network->rules) {
 938                 r = routing_policy_rule_get(link->manager, rule, &rrule);
 939                 if (r >= 0) {
 940                         if (r == 0)
 941                                 (void) routing_policy_rule_make_local(link->manager, rrule);
 942                         continue;
 943                 }
 944
 945                 r = routing_policy_rule_configure(rule, link, NULL);
 946                 if (r < 0)
 947                         return log_link_warning_errno(link, r, "Could not set routing policy rules: %m");
 948                 if (r > 0)
 949                         link->routing_policy_rule_messages++;
 950         }
 951
 952         routing_policy_rule_purge(link->manager, link);
 953         if (link->routing_policy_rule_messages == 0)
 954                 link->routing_policy_rules_configured = true;
 955         else {
 956                 log_link_debug(link, "Setting routing policy rules");
 957                 link_set_state(link, LINK_STATE_CONFIGURING);
 958         }
 959
 960         return 0;
 961 }
 962
 963 static int nexthop_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 964         int r;
 965
 966         assert(link);
 967         assert(link->nexthop_messages > 0);
 968         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
 969                       LINK_STATE_FAILED, LINK_STATE_LINGER));
 970
 971         link->nexthop_messages--;
 972
 973         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 974                 return 1;
 975
 976         r = sd_netlink_message_get_errno(m);
 977         if (r < 0 && r != -EEXIST) {
 978                 log_link_message_warning_errno(link, m, r, "Could not set nexthop");
 979                 link_enter_failed(link);
 980                 return 1;
 981         }
 982
 983         if (link->nexthop_messages == 0) {
 984                 log_link_debug(link, "Nexthop set");
 985                 link->static_nexthops_configured = true;
 986                 link_check_ready(link);
 987         }
 988
 989         return 1;
 990 }
 991
 992 static int link_request_set_nexthop(Link *link) {
 993         NextHop *nh;
 994         int r;
 995
 996         link->static_nexthops_configured = false;
 997
 998         LIST_FOREACH(nexthops, nh, link->network->static_nexthops) {
 999                 r = nexthop_configure(nh, link, nexthop_handler);
1000                 if (r < 0)
1001                         return log_link_warning_errno(link, r, "Could not set nexthop: %m");
1002                 if (r > 0)
1003                         link->nexthop_messages++;
1004         }
1005
1006         if (link->nexthop_messages == 0) {
1007                 link->static_nexthops_configured = true;
1008                 link_check_ready(link);
1009         } else {
1010                 log_link_debug(link, "Setting nexthop");
1011                 link_set_state(link, LINK_STATE_CONFIGURING);
1012         }
1013
1014         return 1;
1015 }
1016
1017 static int route_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1018         int r;
1019
1020         assert(link);
1021         assert(link->route_messages > 0);
1022         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1023                       LINK_STATE_FAILED, LINK_STATE_LINGER));
1024
1025         link->route_messages--;
1026
1027         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1028                 return 1;
1029
1030         r = sd_netlink_message_get_errno(m);
1031         if (r < 0 && r != -EEXIST) {
1032                 log_link_message_warning_errno(link, m, r, "Could not set route");
1033                 link_enter_failed(link);
1034                 return 1;
1035         }
1036
1037         if (link->route_messages == 0) {
1038                 log_link_debug(link, "Routes set");
1039                 link->static_routes_configured = true;
1040                 link_request_set_nexthop(link);
1041         }
1042
1043         return 1;
1044 }
1045
1046 int link_request_set_routes(Link *link) {
1047         enum {
1048                 PHASE_NON_GATEWAY, /* First phase: Routes without a gateway */
1049                 PHASE_GATEWAY,     /* Second phase: Routes with a gateway */
1050                 _PHASE_MAX
1051         } phase;
1052         Route *rt;
1053         int r;
1054
1055         assert(link);
1056         assert(link->network);
1057         assert(link->state != _LINK_STATE_INVALID);
1058
1059         link->static_routes_configured = false;
1060
1061         if (!link->addresses_ready)
1062                 return 0;
1063
1064         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
1065                 /* During configuring addresses, the link lost its carrier. As networkd is dropping
1066                  * the addresses now, let's not configure the routes either. */
1067                 return 0;
1068
1069         r = link_request_set_routing_policy_rule(link);
1070         if (r < 0)
1071                 return r;
1072
1073         /* First add the routes that enable us to talk to gateways, then add in the others that need a gateway. */
1074         for (phase = 0; phase < _PHASE_MAX; phase++)
1075                 LIST_FOREACH(routes, rt, link->network->static_routes) {
1076                         if (rt->gateway_from_dhcp)
1077                                 continue;
1078
1079                         if ((in_addr_is_null(rt->family, &rt->gw) && ordered_set_isempty(rt->multipath_routes)) != (phase == PHASE_NON_GATEWAY))
1080                                 continue;
1081
1082                         r = route_configure(rt, link, route_handler, NULL);
1083                         if (r < 0)
1084                                 return log_link_warning_errno(link, r, "Could not set routes: %m");
1085                         if (r > 0)
1086                                 link->route_messages++;
1087                 }
1088
1089         if (link->route_messages == 0) {
1090                 link->static_routes_configured = true;
1091                 link_request_set_nexthop(link);
1092         } else {
1093                 log_link_debug(link, "Setting routes");
1094                 link_set_state(link, LINK_STATE_CONFIGURING);
1095         }
1096
1097         return 0;
1098 }
1099
1100 void link_check_ready(Link *link) {
1101         Address *a;
1102
1103         assert(link);
1104
1105         if (link->state == LINK_STATE_CONFIGURED)
1106                 return;
1107
1108         if (link->state != LINK_STATE_CONFIGURING) {
1109                 log_link_debug(link, "%s(): link is in %s state.", __func__, link_state_to_string(link->state));
1110                 return;
1111         }
1112
1113         if (!link->network)
1114                 return;
1115
1116         if (!link->addresses_configured) {
1117                 log_link_debug(link, "%s(): static addresses are not configured.", __func__);
1118                 return;
1119         }
1120
1121         if (!link->neighbors_configured) {
1122                 log_link_debug(link, "%s(): static neighbors are not configured.", __func__);
1123                 return;
1124         }
1125
1126         SET_FOREACH(a, link->addresses)
1127                 if (!address_is_ready(a)) {
1128                         _cleanup_free_ char *str = NULL;
1129
1130                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1131                         log_link_debug(link, "%s(): an address %s/%d is not ready.", __func__, strnull(str), a->prefixlen);
1132                         return;
1133                 }
1134
1135         if (!link->static_routes_configured) {
1136                 log_link_debug(link, "%s(): static routes are not configured.", __func__);
1137                 return;
1138         }
1139
1140         if (!link->static_nexthops_configured) {
1141                 log_link_debug(link, "%s(): static nexthops are not configured.", __func__);
1142                 return;
1143         }
1144
1145         if (!link->routing_policy_rules_configured) {
1146                 log_link_debug(link, "%s(): static routing policy rules are not configured.", __func__);
1147                 return;
1148         }
1149
1150         if (!link->tc_configured) {
1151                 log_link_debug(link, "%s(): traffic controls are not configured.", __func__);
1152                 return;
1153         }
1154
1155         if (!link->sr_iov_configured) {
1156                 log_link_debug(link, "%s(): SR-IOV is not configured.", __func__);
1157                 return;
1158         }
1159
1160         if (link_has_carrier(link) || !link->network->configure_without_carrier) {
1161                 bool has_ndisc_address = false;
1162                 NDiscAddress *n;
1163
1164                 if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4) && !link->ipv4ll_address_configured) {
1165                         log_link_debug(link, "%s(): IPv4LL is not configured.", __func__);
1166                         return;
1167                 }
1168
1169                 if (link_ipv6ll_enabled(link) &&
1170                     in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1171                         log_link_debug(link, "%s(): IPv6LL is not configured.", __func__);
1172                         return;
1173                 }
1174
1175                 SET_FOREACH(n, link->ndisc_addresses)
1176                         if (!n->marked) {
1177                                 has_ndisc_address = true;
1178                                 break;
1179                         }
1180
1181                 if ((link_dhcp4_enabled(link) || link_dhcp6_enabled(link)) &&
1182                     !link->dhcp_address && set_isempty(link->dhcp6_addresses) && !has_ndisc_address &&
1183                     !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) {
1184                         log_link_debug(link, "%s(): DHCP4 or DHCP6 is enabled but no dynamic address is assigned yet.", __func__);
1185                         return;
1186                 }
1187
1188                 if (link_dhcp4_enabled(link) || link_dhcp6_enabled(link) || link_dhcp6_pd_is_enabled(link) || link_ipv6_accept_ra_enabled(link)) {
1189                         if (!link->dhcp4_configured &&
1190                             !(link->dhcp6_address_configured && link->dhcp6_route_configured) &&
1191                             !(link->dhcp6_pd_address_configured && link->dhcp6_pd_route_configured) &&
1192                             !(link->ndisc_addresses_configured && link->ndisc_routes_configured) &&
1193                             !(link_ipv4ll_enabled(link, ADDRESS_FAMILY_FALLBACK_IPV4) && link->ipv4ll_address_configured)) {
1194                                 /* When DHCP or RA is enabled, at least one protocol must provide an address, or
1195                                  * an IPv4ll fallback address must be configured. */
1196                                 log_link_debug(link, "%s(): dynamic addresses or routes are not configured.", __func__);
1197                                 return;
1198                         }
1199
1200                         log_link_debug(link, "%s(): dhcp4:%s dhcp6_addresses:%s dhcp_routes:%s dhcp_pd_addresses:%s dhcp_pd_routes:%s ndisc_addresses:%s ndisc_routes:%s",
1201                                        __func__,
1202                                        yes_no(link->dhcp4_configured),
1203                                        yes_no(link->dhcp6_address_configured),
1204                                        yes_no(link->dhcp6_route_configured),
1205                                        yes_no(link->dhcp6_pd_address_configured),
1206                                        yes_no(link->dhcp6_pd_route_configured),
1207                                        yes_no(link->ndisc_addresses_configured),
1208                                        yes_no(link->ndisc_routes_configured));
1209                 }
1210         }
1211
1212         link_enter_configured(link);
1213
1214         return;
1215 }
1216
1217 static int link_request_set_neighbors(Link *link) {
1218         Neighbor *neighbor;
1219         int r;
1220
1221         assert(link);
1222         assert(link->network);
1223         assert(link->state != _LINK_STATE_INVALID);
1224
1225         link->neighbors_configured = false;
1226
1227         LIST_FOREACH(neighbors, neighbor, link->network->neighbors) {
1228                 r = neighbor_configure(neighbor, link, NULL);
1229                 if (r < 0)
1230                         return log_link_warning_errno(link, r, "Could not set neighbor: %m");
1231         }
1232
1233         if (link->neighbor_messages == 0) {
1234                 link->neighbors_configured = true;
1235                 link_check_ready(link);
1236         } else {
1237                 log_link_debug(link, "Setting neighbors");
1238                 link_set_state(link, LINK_STATE_CONFIGURING);
1239         }
1240
1241         return 0;
1242 }
1243
1244 static int link_set_bridge_fdb(Link *link) {
1245         FdbEntry *fdb_entry;
1246         int r;
1247
1248         LIST_FOREACH(static_fdb_entries, fdb_entry, link->network->static_fdb_entries) {
1249                 r = fdb_entry_configure(link, fdb_entry);
1250                 if (r < 0)
1251                         return log_link_error_errno(link, r, "Failed to add MAC entry to static MAC table: %m");
1252         }
1253
1254         return 0;
1255 }
1256
1257 static int static_address_ready_callback(Address *address) {
1258         Address *a;
1259         Link *link;
1260
1261         assert(address);
1262         assert(address->link);
1263
1264         link = address->link;
1265
1266         if (!link->addresses_configured)
1267                 return 0;
1268
1269         SET_FOREACH(a, link->static_addresses)
1270                 if (!address_is_ready(a)) {
1271                         _cleanup_free_ char *str = NULL;
1272
1273                         (void) in_addr_to_string(a->family, &a->in_addr, &str);
1274                         log_link_debug(link, "an address %s/%u is not ready", strnull(str), a->prefixlen);
1275                         return 0;
1276                 }
1277
1278         /* This should not be called again */
1279         SET_FOREACH(a, link->static_addresses)
1280                 a->callback = NULL;
1281
1282         link->addresses_ready = true;
1283
1284         return link_request_set_routes(link);
1285 }
1286
1287 static int address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1288         int r;
1289
1290         assert(rtnl);
1291         assert(m);
1292         assert(link);
1293         assert(link->ifname);
1294         assert(link->address_messages > 0);
1295         assert(IN_SET(link->state, LINK_STATE_CONFIGURING,
1296                LINK_STATE_FAILED, LINK_STATE_LINGER));
1297
1298         link->address_messages--;
1299
1300         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1301                 return 1;
1302
1303         r = sd_netlink_message_get_errno(m);
1304         if (r < 0 && r != -EEXIST) {
1305                 log_link_message_warning_errno(link, m, r, "Could not set address");
1306                 link_enter_failed(link);
1307                 return 1;
1308         } else if (r >= 0)
1309                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
1310
1311         if (link->address_messages == 0) {
1312                 Address *a;
1313
1314                 log_link_debug(link, "Addresses set");
1315                 link->addresses_configured = true;
1316
1317                 /* When all static addresses are already ready, then static_address_ready_callback()
1318                  * will not be called automatically. So, call it here. */
1319                 a = set_first(link->static_addresses);
1320                 if (!a) {
1321                         log_link_warning(link, "No static address is stored.");
1322                         link_enter_failed(link);
1323                         return 1;
1324                 }
1325                 if (!a->callback) {
1326                         log_link_warning(link, "Address ready callback is not set.");
1327                         link_enter_failed(link);
1328                         return 1;
1329                 }
1330                 r = a->callback(a);
1331                 if (r < 0)
1332                         link_enter_failed(link);
1333         }
1334
1335         return 1;
1336 }
1337
1338 static int static_address_configure(Address *address, Link *link, bool update) {
1339         Address *ret;
1340         int r;
1341
1342         assert(address);
1343         assert(link);
1344
1345         r = address_configure(address, link, address_handler, update, &ret);
1346         if (r < 0)
1347                 return log_link_warning_errno(link, r, "Could not configure static address: %m");
1348
1349         link->address_messages++;
1350
1351         r = set_ensure_put(&link->static_addresses, &address_hash_ops, ret);
1352         if (r < 0)
1353                 return log_link_warning_errno(link, r, "Failed to store static address: %m");
1354
1355         ret->callback = static_address_ready_callback;
1356
1357         return 0;
1358 }
1359
1360 static int link_request_set_addresses(Link *link) {
1361         AddressLabel *label;
1362         Address *ad;
1363         Prefix *p;
1364         int r;
1365
1366         assert(link);
1367         assert(link->network);
1368         assert(link->state != _LINK_STATE_INVALID);
1369
1370         if (link->address_remove_messages != 0) {
1371                 log_link_debug(link, "Removing old addresses, new addresses will be configured later.");
1372                 link->request_static_addresses = true;
1373                 return 0;
1374         }
1375
1376         /* Reset all *_configured flags we are configuring. */
1377         link->request_static_addresses = false;
1378         link->addresses_configured = false;
1379         link->addresses_ready = false;
1380         link->neighbors_configured = false;
1381         link->static_routes_configured = false;
1382         link->static_nexthops_configured = false;
1383         link->routing_policy_rules_configured = false;
1384
1385         r = link_set_bridge_fdb(link);
1386         if (r < 0)
1387                 return r;
1388
1389         r = link_request_set_neighbors(link);
1390         if (r < 0)
1391                 return r;
1392
1393         LIST_FOREACH(addresses, ad, link->network->static_addresses) {
1394                 bool update;
1395
1396                 if (ad->family == AF_INET6 && !in_addr_is_null(ad->family, &ad->in_addr_peer))
1397                         update = address_get(link, ad->family, &ad->in_addr_peer, ad->prefixlen, NULL) > 0;
1398                 else
1399                         update = address_get(link, ad->family, &ad->in_addr, ad->prefixlen, NULL) > 0;
1400
1401                 r = static_address_configure(ad, link, update);
1402                 if (r < 0)
1403                         return r;
1404         }
1405
1406         if (link->network->router_prefix_delegation & RADV_PREFIX_DELEGATION_STATIC)
1407                 LIST_FOREACH(prefixes, p, link->network->static_prefixes) {
1408                         _cleanup_(address_freep) Address *address = NULL;
1409
1410                         if (!p->assign)
1411                                 continue;
1412
1413                         r = address_new(&address);
1414                         if (r < 0)
1415                                 return log_oom();
1416
1417                         r = sd_radv_prefix_get_prefix(p->radv_prefix, &address->in_addr.in6, &address->prefixlen);
1418                         if (r < 0)
1419                                 return log_link_warning_errno(link, r, "Could not get RA prefix: %m");
1420
1421                         r = generate_ipv6_eui_64_address(link, &address->in_addr.in6);
1422                         if (r < 0)
1423                                 return log_link_warning_errno(link, r, "Could not generate EUI64 address: %m");
1424
1425                         address->family = AF_INET6;
1426                         r = static_address_configure(address, link, true);
1427                         if (r < 0)
1428                                 return r;
1429                 }
1430
1431         LIST_FOREACH(labels, label, link->network->address_labels) {
1432                 r = address_label_configure(label, link, NULL, false);
1433                 if (r < 0)
1434                         return log_link_warning_errno(link, r, "Could not set address label: %m");
1435
1436                 link->address_label_messages++;
1437         }
1438
1439         /* now that we can figure out a default address for the dhcp server, start it */
1440         if (link_dhcp4_server_enabled(link) && (link->flags & IFF_UP)) {
1441                 r = dhcp4_server_configure(link);
1442                 if (r < 0)
1443                         return r;
1444                 log_link_debug(link, "Offering DHCPv4 leases");
1445         }
1446
1447         if (link->address_messages == 0) {
1448                 link->addresses_configured = true;
1449                 link->addresses_ready = true;
1450                 r = link_request_set_routes(link);
1451                 if (r < 0)
1452                         return r;
1453         } else {
1454                 log_link_debug(link, "Setting addresses");
1455                 link_set_state(link, LINK_STATE_CONFIGURING);
1456         }
1457
1458         return 0;
1459 }
1460
1461 static int link_set_bridge_vlan(Link *link) {
1462         int r;
1463
1464         r = br_vlan_configure(link, link->network->pvid, link->network->br_vid_bitmap, link->network->br_untagged_bitmap);
1465         if (r < 0)
1466                 log_link_error_errno(link, r, "Failed to assign VLANs to bridge port: %m");
1467
1468         return r;
1469 }
1470
1471 static int link_set_proxy_arp(Link *link) {
1472         int r;
1473
1474         if (!link_proxy_arp_enabled(link))
1475                 return 0;
1476
1477         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "proxy_arp", link->network->proxy_arp > 0);
1478         if (r < 0)
1479                 log_link_warning_errno(link, r, "Cannot configure proxy ARP for interface: %m");
1480
1481         return 0;
1482 }
1483
1484 static int link_configure_continue(Link *link);
1485
1486 static int set_mtu_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1487         int r;
1488
1489         assert(m);
1490         assert(link);
1491         assert(link->ifname);
1492
1493         link->setting_mtu = false;
1494
1495         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1496                 return 1;
1497
1498         r = sd_netlink_message_get_errno(m);
1499         if (r < 0)
1500                 log_link_message_warning_errno(link, m, r, "Could not set MTU, ignoring");
1501         else
1502                 log_link_debug(link, "Setting MTU done.");
1503
1504         if (link->state == LINK_STATE_INITIALIZED) {
1505                 r = link_configure_continue(link);
1506                 if (r < 0)
1507                         link_enter_failed(link);
1508         }
1509
1510         return 1;
1511 }
1512
1513 int link_set_mtu(Link *link, uint32_t mtu) {
1514         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1515         int r;
1516
1517         assert(link);
1518         assert(link->manager);
1519         assert(link->manager->rtnl);
1520
1521         if (mtu == 0 || link->setting_mtu)
1522                 return 0;
1523
1524         if (link->mtu == mtu)
1525                 return 0;
1526
1527         log_link_debug(link, "Setting MTU: %" PRIu32, mtu);
1528
1529         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1530         if (r < 0)
1531                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1532
1533         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
1534          * on the interface. Bump up MTU bytes to IPV6_MTU_MIN. */
1535         if (link_ipv6_enabled(link) && mtu < IPV6_MIN_MTU) {
1536
1537                 log_link_warning(link, "Bumping MTU to " STRINGIFY(IPV6_MIN_MTU) ", as "
1538                                  "IPv6 is requested and requires a minimum MTU of " STRINGIFY(IPV6_MIN_MTU) " bytes");
1539
1540                 mtu = IPV6_MIN_MTU;
1541         }
1542
1543         r = sd_netlink_message_append_u32(req, IFLA_MTU, mtu);
1544         if (r < 0)
1545                 return log_link_error_errno(link, r, "Could not append MTU: %m");
1546
1547         r = netlink_call_async(link->manager->rtnl, NULL, req, set_mtu_handler,
1548                                link_netlink_destroy_callback, link);
1549         if (r < 0)
1550                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1551
1552         link_ref(link);
1553         link->setting_mtu = true;
1554
1555         return 0;
1556 }
1557
1558 static bool link_reduces_vlan_mtu(Link *link) {
1559         /* See netif_reduces_vlan_mtu() in kernel. */
1560         return streq_ptr(link->kind, "macsec");
1561 }
1562
1563 static uint32_t link_get_requested_mtu_by_stacked_netdevs(Link *link) {
1564         uint32_t mtu = 0;
1565         NetDev *dev;
1566
1567         HASHMAP_FOREACH(dev, link->network->stacked_netdevs)
1568                 if (dev->kind == NETDEV_KIND_VLAN && dev->mtu > 0)
1569                         /* See vlan_dev_change_mtu() in kernel. */
1570                         mtu = MAX(mtu, link_reduces_vlan_mtu(link) ? dev->mtu + 4 : dev->mtu);
1571
1572                 else if (dev->kind == NETDEV_KIND_MACVLAN && dev->mtu > mtu)
1573                         /* See macvlan_change_mtu() in kernel. */
1574                         mtu = dev->mtu;
1575
1576         return mtu;
1577 }
1578
1579 static int link_configure_mtu(Link *link) {
1580         uint32_t mtu;
1581
1582         assert(link);
1583         assert(link->network);
1584
1585         if (link->network->mtu > 0)
1586                 return link_set_mtu(link, link->network->mtu);
1587
1588         mtu = link_get_requested_mtu_by_stacked_netdevs(link);
1589         if (link->mtu >= mtu)
1590                 return 0;
1591
1592         log_link_notice(link, "Bumping MTU bytes from %"PRIu32" to %"PRIu32" because of stacked device. "
1593                         "If it is not desired, then please explicitly specify MTUBytes= setting.",
1594                         link->mtu, mtu);
1595
1596         return link_set_mtu(link, mtu);
1597 }
1598
1599 static int set_flags_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1600         int r;
1601
1602         assert(m);
1603         assert(link);
1604         assert(link->ifname);
1605
1606         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1607                 return 1;
1608
1609         r = sd_netlink_message_get_errno(m);
1610         if (r < 0)
1611                 log_link_message_warning_errno(link, m, r, "Could not set link flags, ignoring");
1612
1613         return 1;
1614 }
1615
1616 static int link_set_flags(Link *link) {
1617         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1618         unsigned ifi_change = 0;
1619         unsigned ifi_flags = 0;
1620         int r;
1621
1622         assert(link);
1623         assert(link->manager);
1624         assert(link->manager->rtnl);
1625
1626         if (link->flags & IFF_LOOPBACK)
1627                 return 0;
1628
1629         if (!link->network)
1630                 return 0;
1631
1632         if (link->network->arp < 0 && link->network->multicast < 0 && link->network->allmulticast < 0)
1633                 return 0;
1634
1635         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1636         if (r < 0)
1637                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1638
1639         if (link->network->arp >= 0) {
1640                 ifi_change |= IFF_NOARP;
1641                 SET_FLAG(ifi_flags, IFF_NOARP, link->network->arp == 0);
1642         }
1643
1644         if (link->network->multicast >= 0) {
1645                 ifi_change |= IFF_MULTICAST;
1646                 SET_FLAG(ifi_flags, IFF_MULTICAST, link->network->multicast);
1647         }
1648
1649         if (link->network->allmulticast >= 0) {
1650                 ifi_change |= IFF_ALLMULTI;
1651                 SET_FLAG(ifi_flags, IFF_ALLMULTI, link->network->allmulticast);
1652         }
1653
1654         r = sd_rtnl_message_link_set_flags(req, ifi_flags, ifi_change);
1655         if (r < 0)
1656                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1657
1658         r = netlink_call_async(link->manager->rtnl, NULL, req, set_flags_handler,
1659                                link_netlink_destroy_callback, link);
1660         if (r < 0)
1661                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1662
1663         link_ref(link);
1664
1665         return 0;
1666 }
1667
1668 static int link_acquire_ipv6_conf(Link *link) {
1669         int r;
1670
1671         assert(link);
1672
1673         if (link_ipv6_accept_ra_enabled(link)) {
1674                 assert(link->ndisc);
1675
1676                 log_link_debug(link, "Discovering IPv6 routers");
1677
1678                 r = sd_ndisc_start(link->ndisc);
1679                 if (r < 0 && r != -EBUSY)
1680                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Discovery: %m");
1681         }
1682
1683         if (link_radv_enabled(link)) {
1684                 assert(link->radv);
1685                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1686
1687                 log_link_debug(link, "Starting IPv6 Router Advertisements");
1688
1689                 r = radv_emit_dns(link);
1690                 if (r < 0)
1691                         return log_link_warning_errno(link, r, "Failed to configure DNS or Domains in IPv6 Router Advertisement: %m");
1692
1693                 r = sd_radv_start(link->radv);
1694                 if (r < 0 && r != -EBUSY)
1695                         return log_link_warning_errno(link, r, "Could not start IPv6 Router Advertisement: %m");
1696         }
1697
1698         if (link_dhcp6_enabled(link) && IN_SET(link->network->dhcp6_without_ra,
1699                                                DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST,
1700                                                DHCP6_CLIENT_START_MODE_SOLICIT)) {
1701                 assert(link->dhcp6_client);
1702                 assert(in_addr_is_link_local(AF_INET6, (const union in_addr_union*)&link->ipv6ll_address) > 0);
1703
1704                 r = dhcp6_request_address(link, link->network->dhcp6_without_ra == DHCP6_CLIENT_START_MODE_INFORMATION_REQUEST);
1705                 if (r < 0 && r != -EBUSY)
1706                         return log_link_warning_errno(link, r, "Could not acquire DHCPv6 lease: %m");
1707                 else
1708                         log_link_debug(link, "Acquiring DHCPv6 lease");
1709         }
1710
1711         r = dhcp6_request_prefix_delegation(link);
1712         if (r < 0)
1713                 return log_link_warning_errno(link, r, "Failed to request DHCPv6 prefix delegation: %m");
1714
1715         return 0;
1716 }
1717
1718 static int link_acquire_ipv4_conf(Link *link) {
1719         int r;
1720
1721         assert(link);
1722         assert(link->manager);
1723         assert(link->manager->event);
1724
1725         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4)) {
1726                 assert(link->ipv4ll);
1727
1728                 log_link_debug(link, "Acquiring IPv4 link-local address");
1729
1730                 r = sd_ipv4ll_start(link->ipv4ll);
1731                 if (r < 0)
1732                         return log_link_warning_errno(link, r, "Could not acquire IPv4 link-local address: %m");
1733         }
1734
1735         if (link_dhcp4_enabled(link)) {
1736                 assert(link->dhcp_client);
1737
1738                 log_link_debug(link, "Acquiring DHCPv4 lease");
1739
1740                 r = sd_dhcp_client_start(link->dhcp_client);
1741                 if (r < 0)
1742                         return log_link_warning_errno(link, r, "Could not acquire DHCPv4 lease: %m");
1743         }
1744
1745         return 0;
1746 }
1747
1748 static int link_acquire_conf(Link *link) {
1749         int r;
1750
1751         assert(link);
1752
1753         r = link_acquire_ipv4_conf(link);
1754         if (r < 0)
1755                 return r;
1756
1757         if (!in_addr_is_null(AF_INET6, (const union in_addr_union*) &link->ipv6ll_address)) {
1758                 r = link_acquire_ipv6_conf(link);
1759                 if (r < 0)
1760                         return r;
1761         }
1762
1763         if (link_lldp_emit_enabled(link)) {
1764                 r = link_lldp_emit_start(link);
1765                 if (r < 0)
1766                         return log_link_warning_errno(link, r, "Failed to start LLDP transmission: %m");
1767         }
1768
1769         return 0;
1770 }
1771
1772 bool link_has_carrier(Link *link) {
1773         /* see Documentation/networking/operstates.txt in the kernel sources */
1774
1775         if (link->kernel_operstate == IF_OPER_UP)
1776                 return true;
1777
1778         if (link->kernel_operstate == IF_OPER_UNKNOWN)
1779                 /* operstate may not be implemented, so fall back to flags */
1780                 if (FLAGS_SET(link->flags, IFF_LOWER_UP | IFF_RUNNING) &&
1781                     !FLAGS_SET(link->flags, IFF_DORMANT))
1782                         return true;
1783
1784         return false;
1785 }
1786
1787 static int link_address_genmode_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1788         int r;
1789
1790         assert(link);
1791
1792         link->setting_genmode = false;
1793
1794         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1795                 return 1;
1796
1797         r = sd_netlink_message_get_errno(m);
1798         if (r < 0)
1799                 log_link_message_warning_errno(link, m, r, "Could not set address genmode for interface, ignoring");
1800         else
1801                 log_link_debug(link, "Setting address genmode done.");
1802
1803         if (link->state == LINK_STATE_INITIALIZED) {
1804                 r = link_configure_continue(link);
1805                 if (r < 0)
1806                         link_enter_failed(link);
1807         }
1808
1809         return 1;
1810 }
1811
1812 static int link_configure_addrgen_mode(Link *link) {
1813         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1814         uint8_t ipv6ll_mode;
1815         int r;
1816
1817         assert(link);
1818         assert(link->network);
1819         assert(link->manager);
1820         assert(link->manager->rtnl);
1821
1822         if (!socket_ipv6_is_supported() || link->setting_genmode)
1823                 return 0;
1824
1825         log_link_debug(link, "Setting address genmode for link");
1826
1827         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1828         if (r < 0)
1829                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1830
1831         r = sd_netlink_message_open_container(req, IFLA_AF_SPEC);
1832         if (r < 0)
1833                 return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m");
1834
1835         r = sd_netlink_message_open_container(req, AF_INET6);
1836         if (r < 0)
1837                 return log_link_error_errno(link, r, "Could not open AF_INET6 container: %m");
1838
1839         if (!link_ipv6ll_enabled(link))
1840                 ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE;
1841         else if (link->network->ipv6ll_address_gen_mode < 0) {
1842                 r = sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL);
1843                 if (r < 0) {
1844                         /* The file may not exist. And even if it exists, when stable_secret is unset,
1845                          * reading the file fails with EIO. */
1846                         log_link_debug_errno(link, r, "Failed to read sysctl property stable_secret: %m");
1847
1848                         ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64;
1849                 } else
1850                         ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
1851         } else
1852                 ipv6ll_mode = link->network->ipv6ll_address_gen_mode;
1853
1854         r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode);
1855         if (r < 0)
1856                 return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m");
1857
1858         r = sd_netlink_message_close_container(req);
1859         if (r < 0)
1860                 return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");
1861
1862         r = sd_netlink_message_close_container(req);
1863         if (r < 0)
1864                 return log_link_error_errno(link, r, "Could not close IFLA_AF_SPEC container: %m");
1865
1866         r = netlink_call_async(link->manager->rtnl, NULL, req, link_address_genmode_handler,
1867                                link_netlink_destroy_callback, link);
1868         if (r < 0)
1869                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1870
1871         link_ref(link);
1872         link->setting_genmode = true;
1873
1874         return 0;
1875 }
1876
1877 static int link_up_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1878         int r;
1879
1880         assert(link);
1881
1882         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1883                 return 1;
1884
1885         r = sd_netlink_message_get_errno(m);
1886         if (r < 0)
1887                 /* we warn but don't fail the link, as it may be brought up later */
1888                 log_link_message_warning_errno(link, m, r, "Could not bring up interface");
1889
1890         return 1;
1891 }
1892
1893 static int link_up(Link *link) {
1894         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1895         int r;
1896
1897         assert(link);
1898         assert(link->network);
1899         assert(link->manager);
1900         assert(link->manager->rtnl);
1901
1902         log_link_debug(link, "Bringing link up");
1903
1904         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
1905         if (r < 0)
1906                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1907
1908         /* set it free if not enslaved with networkd */
1909         if (!link->network->bridge && !link->network->bond && !link->network->vrf) {
1910                 r = sd_netlink_message_append_u32(req, IFLA_MASTER, 0);
1911                 if (r < 0)
1912                         return log_link_error_errno(link, r, "Could not append IFLA_MASTER attribute: %m");
1913         }
1914
1915         r = sd_rtnl_message_link_set_flags(req, IFF_UP, IFF_UP);
1916         if (r < 0)
1917                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1918
1919         if (link->network->mac) {
1920                 r = sd_netlink_message_append_ether_addr(req, IFLA_ADDRESS, link->network->mac);
1921                 if (r < 0)
1922                         return log_link_error_errno(link, r, "Could not set MAC address: %m");
1923         }
1924
1925         r = netlink_call_async(link->manager->rtnl, NULL, req, link_up_handler,
1926                                link_netlink_destroy_callback, link);
1927         if (r < 0)
1928                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1929
1930         link_ref(link);
1931
1932         return 0;
1933 }
1934
1935 static int link_down_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1936         int r;
1937
1938         assert(link);
1939
1940         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1941                 return 1;
1942
1943         r = sd_netlink_message_get_errno(m);
1944         if (r < 0)
1945                 log_link_message_warning_errno(link, m, r, "Could not bring down interface");
1946
1947         return 1;
1948 }
1949
1950 int link_down(Link *link, link_netlink_message_handler_t callback) {
1951         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1952         int r;
1953
1954         assert(link);
1955         assert(link->manager);
1956         assert(link->manager->rtnl);
1957
1958         log_link_debug(link, "Bringing link down");
1959
1960         r = sd_rtnl_message_new_link(link->manager->rtnl, &req,
1961                                      RTM_SETLINK, link->ifindex);
1962         if (r < 0)
1963                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
1964
1965         r = sd_rtnl_message_link_set_flags(req, 0, IFF_UP);
1966         if (r < 0)
1967                 return log_link_error_errno(link, r, "Could not set link flags: %m");
1968
1969         r = netlink_call_async(link->manager->rtnl, NULL, req,
1970                                callback ?: link_down_handler,
1971                                link_netlink_destroy_callback, link);
1972         if (r < 0)
1973                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
1974
1975         link_ref(link);
1976
1977         return 0;
1978 }
1979
1980 static int link_group_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
1981         int r;
1982
1983         assert(link);
1984
1985         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
1986                 return 1;
1987
1988         r = sd_netlink_message_get_errno(m);
1989         if (r < 0)
1990                 log_link_message_warning_errno(link, m, r, "Could not set group for the interface");
1991
1992         return 1;
1993 }
1994
1995 static int link_set_group(Link *link) {
1996         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
1997         int r;
1998
1999         assert(link);
2000         assert(link->network);
2001         assert(link->manager);
2002         assert(link->manager->rtnl);
2003
2004         if (link->network->group <= 0)
2005                 return 0;
2006
2007         log_link_debug(link, "Setting group");
2008
2009         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
2010         if (r < 0)
2011                 return log_link_error_errno(link, r, "Could not allocate RTM_SETLINK message: %m");
2012
2013         r = sd_netlink_message_append_u32(req, IFLA_GROUP, link->network->group);
2014         if (r < 0)
2015                 return log_link_error_errno(link, r, "Could not set link group: %m");
2016
2017         r = netlink_call_async(link->manager->rtnl, NULL, req, link_group_handler,
2018                                link_netlink_destroy_callback, link);
2019         if (r < 0)
2020                 return log_link_error_errno(link, r, "Could not send rtnetlink message: %m");
2021
2022         link_ref(link);
2023
2024         return 0;
2025 }
2026
2027 static int link_handle_bound_to_list(Link *link) {
2028         Link *l;
2029         int r;
2030         bool required_up = false;
2031         bool link_is_up = false;
2032
2033         assert(link);
2034
2035         if (hashmap_isempty(link->bound_to_links))
2036                 return 0;
2037
2038         if (link->flags & IFF_UP)
2039                 link_is_up = true;
2040
2041         HASHMAP_FOREACH (l, link->bound_to_links)
2042                 if (link_has_carrier(l)) {
2043                         required_up = true;
2044                         break;
2045                 }
2046
2047         if (!required_up && link_is_up) {
2048                 r = link_down(link, NULL);
2049                 if (r < 0)
2050                         return r;
2051         } else if (required_up && !link_is_up) {
2052                 r = link_up(link);
2053                 if (r < 0)
2054                         return r;
2055         }
2056
2057         return 0;
2058 }
2059
2060 static int link_handle_bound_by_list(Link *link) {
2061         Link *l;
2062         int r;
2063
2064         assert(link);
2065
2066         if (hashmap_isempty(link->bound_by_links))
2067                 return 0;
2068
2069         HASHMAP_FOREACH (l, link->bound_by_links) {
2070                 r = link_handle_bound_to_list(l);
2071                 if (r < 0)
2072                         return r;
2073         }
2074
2075         return 0;
2076 }
2077
2078 static int link_put_carrier(Link *link, Link *carrier, Hashmap **h) {
2079         int r;
2080
2081         assert(link);
2082         assert(carrier);
2083
2084         if (link == carrier)
2085                 return 0;
2086
2087         if (hashmap_get(*h, INT_TO_PTR(carrier->ifindex)))
2088                 return 0;
2089
2090         r = hashmap_ensure_allocated(h, NULL);
2091         if (r < 0)
2092                 return r;
2093
2094         r = hashmap_put(*h, INT_TO_PTR(carrier->ifindex), carrier);
2095         if (r < 0)
2096                 return r;
2097
2098         return 0;
2099 }
2100
2101 static int link_new_bound_by_list(Link *link) {
2102         Manager *m;
2103         Link *carrier;
2104         int r;
2105         bool list_updated = false;
2106
2107         assert(link);
2108         assert(link->manager);
2109
2110         m = link->manager;
2111
2112         HASHMAP_FOREACH(carrier, m->links) {
2113                 if (!carrier->network)
2114                         continue;
2115
2116                 if (strv_isempty(carrier->network->bind_carrier))
2117                         continue;
2118
2119                 if (strv_fnmatch(carrier->network->bind_carrier, link->ifname)) {
2120                         r = link_put_carrier(link, carrier, &link->bound_by_links);
2121                         if (r < 0)
2122                                 return r;
2123
2124                         list_updated = true;
2125                 }
2126         }
2127
2128         if (list_updated)
2129                 link_dirty(link);
2130
2131         HASHMAP_FOREACH(carrier, link->bound_by_links) {
2132                 r = link_put_carrier(carrier, link, &carrier->bound_to_links);
2133                 if (r < 0)
2134                         return r;
2135
2136                 link_dirty(carrier);
2137         }
2138
2139         return 0;
2140 }
2141
2142 static int link_new_bound_to_list(Link *link) {
2143         Manager *m;
2144         Link *carrier;
2145         int r;
2146         bool list_updated = false;
2147
2148         assert(link);
2149         assert(link->manager);
2150
2151         if (!link->network)
2152                 return 0;
2153
2154         if (strv_isempty(link->network->bind_carrier))
2155                 return 0;
2156
2157         m = link->manager;
2158
2159         HASHMAP_FOREACH (carrier, m->links) {
2160                 if (strv_fnmatch(link->network->bind_carrier, carrier->ifname)) {
2161                         r = link_put_carrier(link, carrier, &link->bound_to_links);
2162                         if (r < 0)
2163                                 return r;
2164
2165                         list_updated = true;
2166                 }
2167         }
2168
2169         if (list_updated)
2170                 link_dirty(link);
2171
2172         HASHMAP_FOREACH (carrier, link->bound_to_links) {
2173                 r = link_put_carrier(carrier, link, &carrier->bound_by_links);
2174                 if (r < 0)
2175                         return r;
2176
2177                 link_dirty(carrier);
2178         }
2179
2180         return 0;
2181 }
2182
2183 static int link_new_carrier_maps(Link *link) {
2184         int r;
2185
2186         r = link_new_bound_by_list(link);
2187         if (r < 0)
2188                 return r;
2189
2190         r = link_handle_bound_by_list(link);
2191         if (r < 0)
2192                 return r;
2193
2194         r = link_new_bound_to_list(link);
2195         if (r < 0)
2196                 return r;
2197
2198         r = link_handle_bound_to_list(link);
2199         if (r < 0)
2200                 return r;
2201
2202         return 0;
2203 }
2204
2205 static void link_free_bound_to_list(Link *link) {
2206         Link *bound_to;
2207
2208         HASHMAP_FOREACH (bound_to, link->bound_to_links) {
2209                 hashmap_remove(link->bound_to_links, INT_TO_PTR(bound_to->ifindex));
2210
2211                 if (hashmap_remove(bound_to->bound_by_links, INT_TO_PTR(link->ifindex)))
2212                         link_dirty(bound_to);
2213         }
2214
2215         return;
2216 }
2217
2218 static void link_free_bound_by_list(Link *link) {
2219         Link *bound_by;
2220
2221         HASHMAP_FOREACH (bound_by, link->bound_by_links) {
2222                 hashmap_remove(link->bound_by_links, INT_TO_PTR(bound_by->ifindex));
2223
2224                 if (hashmap_remove(bound_by->bound_to_links, INT_TO_PTR(link->ifindex))) {
2225                         link_dirty(bound_by);
2226                         link_handle_bound_to_list(bound_by);
2227                 }
2228         }
2229
2230         return;
2231 }
2232
2233 static void link_free_carrier_maps(Link *link) {
2234         bool list_updated = false;
2235
2236         assert(link);
2237
2238         if (!hashmap_isempty(link->bound_to_links)) {
2239                 link_free_bound_to_list(link);
2240                 list_updated = true;
2241         }
2242
2243         if (!hashmap_isempty(link->bound_by_links)) {
2244                 link_free_bound_by_list(link);
2245                 list_updated = true;
2246         }
2247
2248         if (list_updated)
2249                 link_dirty(link);
2250
2251         return;
2252 }
2253
2254 static int link_append_to_master(Link *link, NetDev *netdev) {
2255         Link *master;
2256         int r;
2257
2258         assert(link);
2259         assert(netdev);
2260
2261         r = link_get(link->manager, netdev->ifindex, &master);
2262         if (r < 0)
2263                 return r;
2264
2265         r = set_ensure_put(&master->slaves, NULL, link);
2266         if (r <= 0)
2267                 return r;
2268
2269         link_ref(link);
2270         return 0;
2271 }
2272
2273 static void link_drop_from_master(Link *link, NetDev *netdev) {
2274         Link *master;
2275
2276         assert(link);
2277
2278         if (!link->manager || !netdev)
2279                 return;
2280
2281         if (link_get(link->manager, netdev->ifindex, &master) < 0)
2282                 return;
2283
2284         link_unref(set_remove(master->slaves, link));
2285 }
2286
2287 static void link_detach_from_manager(Link *link) {
2288         if (!link || !link->manager)
2289                 return;
2290
2291         link_unref(set_remove(link->manager->links_requesting_uuid, link));
2292         link_clean(link);
2293
2294         /* The following must be called at last. */
2295         assert_se(hashmap_remove(link->manager->links, INT_TO_PTR(link->ifindex)) == link);
2296         link_unref(link);
2297 }
2298
2299 void link_drop(Link *link) {
2300         if (!link || link->state == LINK_STATE_LINGER)
2301                 return;
2302
2303         link_set_state(link, LINK_STATE_LINGER);
2304
2305         link_free_carrier_maps(link);
2306
2307         if (link->network) {
2308                 link_drop_from_master(link, link->network->bridge);
2309                 link_drop_from_master(link, link->network->bond);
2310         }
2311
2312         log_link_debug(link, "Link removed");
2313
2314         (void) unlink(link->state_file);
2315         link_detach_from_manager(link);
2316 }
2317
2318 static int link_joined(Link *link) {
2319         int r;
2320
2321         assert(link);
2322         assert(link->network);
2323
2324         if (!hashmap_isempty(link->bound_to_links)) {
2325                 r = link_handle_bound_to_list(link);
2326                 if (r < 0)
2327                         return r;
2328         } else if (!(link->flags & IFF_UP)) {
2329                 r = link_up(link);
2330                 if (r < 0) {
2331                         link_enter_failed(link);
2332                         return r;
2333                 }
2334         }
2335
2336         if (link->network->bridge) {
2337                 r = link_set_bridge(link);
2338                 if (r < 0)
2339                         log_link_error_errno(link, r, "Could not set bridge message: %m");
2340
2341                 r = link_append_to_master(link, link->network->bridge);
2342                 if (r < 0)
2343                         log_link_error_errno(link, r, "Failed to add to bridge master's slave list: %m");
2344         }
2345
2346         if (link->network->bond) {
2347                 r = link_set_bond(link);
2348                 if (r < 0)
2349                         log_link_error_errno(link, r, "Could not set bond message: %m");
2350
2351                 r = link_append_to_master(link, link->network->bond);
2352                 if (r < 0)
2353                         log_link_error_errno(link, r, "Failed to add to bond master's slave list: %m");
2354         }
2355
2356         if (link->network->use_br_vlan &&
2357             (link->network->bridge || streq_ptr("bridge", link->kind))) {
2358                 r = link_set_bridge_vlan(link);
2359                 if (r < 0)
2360                         log_link_error_errno(link, r, "Could not set bridge vlan: %m");
2361         }
2362
2363         /* Skip setting up addresses until it gets carrier,
2364            or it would try to set addresses twice,
2365            which is bad for non-idempotent steps. */
2366         if (!link_has_carrier(link) && !link->network->configure_without_carrier)
2367                 return 0;
2368
2369         link_set_state(link, LINK_STATE_CONFIGURING);
2370         return link_request_set_addresses(link);
2371 }
2372
2373 static int netdev_join_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2374         int r;
2375
2376         assert(link);
2377         assert(link->network);
2378         assert(link->enslaving > 0);
2379
2380         link->enslaving--;
2381
2382         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2383                 return 1;
2384
2385         r = sd_netlink_message_get_errno(m);
2386         if (r < 0 && r != -EEXIST) {
2387                 log_link_message_warning_errno(link, m, r, "Could not join netdev");
2388                 link_enter_failed(link);
2389                 return 1;
2390         }
2391
2392         log_link_debug(link, "Joined netdev");
2393
2394         if (link->enslaving == 0) {
2395                 r = link_joined(link);
2396                 if (r < 0)
2397                         link_enter_failed(link);
2398         }
2399
2400         return 1;
2401 }
2402
2403 static int link_enter_join_netdev(Link *link) {
2404         NetDev *netdev;
2405         int r;
2406
2407         assert(link);
2408         assert(link->network);
2409         assert(link->state == LINK_STATE_INITIALIZED);
2410
2411         link_set_state(link, LINK_STATE_CONFIGURING);
2412
2413         link_dirty(link);
2414         link->enslaving = 0;
2415
2416         if (link->network->bond) {
2417                 if (link->network->bond->state == NETDEV_STATE_READY &&
2418                     link->network->bond->ifindex == link->master_ifindex)
2419                         return link_joined(link);
2420
2421                 log_struct(LOG_DEBUG,
2422                            LOG_LINK_INTERFACE(link),
2423                            LOG_NETDEV_INTERFACE(link->network->bond),
2424                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bond->ifname));
2425
2426                 link->enslaving++;
2427
2428                 r = netdev_join(link->network->bond, link, netdev_join_handler);
2429                 if (r < 0) {
2430                         log_struct_errno(LOG_WARNING, r,
2431                                          LOG_LINK_INTERFACE(link),
2432                                          LOG_NETDEV_INTERFACE(link->network->bond),
2433                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bond->ifname));
2434                         link_enter_failed(link);
2435                         return r;
2436                 }
2437         }
2438
2439         if (link->network->bridge) {
2440                 log_struct(LOG_DEBUG,
2441                            LOG_LINK_INTERFACE(link),
2442                            LOG_NETDEV_INTERFACE(link->network->bridge),
2443                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->bridge->ifname));
2444
2445                 link->enslaving++;
2446
2447                 r = netdev_join(link->network->bridge, link, netdev_join_handler);
2448                 if (r < 0) {
2449                         log_struct_errno(LOG_WARNING, r,
2450                                          LOG_LINK_INTERFACE(link),
2451                                          LOG_NETDEV_INTERFACE(link->network->bridge),
2452                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->bridge->ifname));
2453                         link_enter_failed(link);
2454                         return r;
2455                 }
2456         }
2457
2458         if (link->network->vrf) {
2459                 log_struct(LOG_DEBUG,
2460                            LOG_LINK_INTERFACE(link),
2461                            LOG_NETDEV_INTERFACE(link->network->vrf),
2462                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", link->network->vrf->ifname));
2463
2464                 link->enslaving++;
2465
2466                 r = netdev_join(link->network->vrf, link, netdev_join_handler);
2467                 if (r < 0) {
2468                         log_struct_errno(LOG_WARNING, r,
2469                                          LOG_LINK_INTERFACE(link),
2470                                          LOG_NETDEV_INTERFACE(link->network->vrf),
2471                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", link->network->vrf->ifname));
2472                         link_enter_failed(link);
2473                         return r;
2474                 }
2475         }
2476
2477         HASHMAP_FOREACH(netdev, link->network->stacked_netdevs) {
2478
2479                 if (netdev->ifindex > 0)
2480                         /* Assume already enslaved. */
2481                         continue;
2482
2483                 if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
2484                         continue;
2485
2486                 log_struct(LOG_DEBUG,
2487                            LOG_LINK_INTERFACE(link),
2488                            LOG_NETDEV_INTERFACE(netdev),
2489                            LOG_LINK_MESSAGE(link, "Enslaving by '%s'", netdev->ifname));
2490
2491                 link->enslaving++;
2492
2493                 r = netdev_join(netdev, link, netdev_join_handler);
2494                 if (r < 0) {
2495                         log_struct_errno(LOG_WARNING, r,
2496                                          LOG_LINK_INTERFACE(link),
2497                                          LOG_NETDEV_INTERFACE(netdev),
2498                                          LOG_LINK_MESSAGE(link, "Could not join netdev '%s': %m", netdev->ifname));
2499                         link_enter_failed(link);
2500                         return r;
2501                 }
2502         }
2503
2504         if (link->enslaving == 0)
2505                 return link_joined(link);
2506
2507         return 0;
2508 }
2509
2510 static int link_set_ipv4_forward(Link *link) {
2511         int r;
2512
2513         if (!link_ipv4_forward_enabled(link))
2514                 return 0;
2515
2516         /* We propagate the forwarding flag from one interface to the
2517          * global setting one way. This means: as long as at least one
2518          * interface was configured at any time that had IP forwarding
2519          * enabled the setting will stay on for good. We do this
2520          * primarily to keep IPv4 and IPv6 packet forwarding behaviour
2521          * somewhat in sync (see below). */
2522
2523         r = sysctl_write_ip_property(AF_INET, NULL, "ip_forward", "1");
2524         if (r < 0)
2525                 log_link_warning_errno(link, r, "Cannot turn on IPv4 packet forwarding, ignoring: %m");
2526
2527         return 0;
2528 }
2529
2530 static int link_set_ipv6_forward(Link *link) {
2531         int r;
2532
2533         if (!link_ipv6_forward_enabled(link))
2534                 return 0;
2535
2536         /* On Linux, the IPv6 stack does not know a per-interface
2537          * packet forwarding setting: either packet forwarding is on
2538          * for all, or off for all. We hence don't bother with a
2539          * per-interface setting, but simply propagate the interface
2540          * flag, if it is set, to the global flag, one-way. Note that
2541          * while IPv4 would allow a per-interface flag, we expose the
2542          * same behaviour there and also propagate the setting from
2543          * one to all, to keep things simple (see above). */
2544
2545         r = sysctl_write_ip_property(AF_INET6, "all", "forwarding", "1");
2546         if (r < 0)
2547                 log_link_warning_errno(link, r, "Cannot configure IPv6 packet forwarding, ignoring: %m");
2548
2549         return 0;
2550 }
2551
2552 static int link_set_ipv6_privacy_extensions(Link *link) {
2553         IPv6PrivacyExtensions s;
2554         int r;
2555
2556         s = link_ipv6_privacy_extensions(link);
2557         if (s < 0)
2558                 return 0;
2559
2560         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "use_tempaddr", (int) link->network->ipv6_privacy_extensions);
2561         if (r < 0)
2562                 log_link_warning_errno(link, r, "Cannot configure IPv6 privacy extension for interface: %m");
2563
2564         return 0;
2565 }
2566
2567 static int link_set_ipv6_accept_ra(Link *link) {
2568         int r;
2569
2570         /* Make this a NOP if IPv6 is not available */
2571         if (!socket_ipv6_is_supported())
2572                 return 0;
2573
2574         if (link->flags & IFF_LOOPBACK)
2575                 return 0;
2576
2577         if (!link->network)
2578                 return 0;
2579
2580         r = sysctl_write_ip_property(AF_INET6, link->ifname, "accept_ra", "0");
2581         if (r < 0)
2582                 log_link_warning_errno(link, r, "Cannot disable kernel IPv6 accept_ra for interface: %m");
2583
2584         return 0;
2585 }
2586
2587 static int link_set_ipv6_dad_transmits(Link *link) {
2588         int r;
2589
2590         /* Make this a NOP if IPv6 is not available */
2591         if (!socket_ipv6_is_supported())
2592                 return 0;
2593
2594         if (link->flags & IFF_LOOPBACK)
2595                 return 0;
2596
2597         if (!link->network)
2598                 return 0;
2599
2600         if (link->network->ipv6_dad_transmits < 0)
2601                 return 0;
2602
2603         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "dad_transmits", link->network->ipv6_dad_transmits);
2604         if (r < 0)
2605                 log_link_warning_errno(link, r, "Cannot set IPv6 dad transmits for interface: %m");
2606
2607         return 0;
2608 }
2609
2610 static int link_set_ipv6_hop_limit(Link *link) {
2611         int r;
2612
2613         /* Make this a NOP if IPv6 is not available */
2614         if (!socket_ipv6_is_supported())
2615                 return 0;
2616
2617         if (link->flags & IFF_LOOPBACK)
2618                 return 0;
2619
2620         if (!link->network)
2621                 return 0;
2622
2623         if (link->network->ipv6_hop_limit < 0)
2624                 return 0;
2625
2626         r = sysctl_write_ip_property_int(AF_INET6, link->ifname, "hop_limit", link->network->ipv6_hop_limit);
2627         if (r < 0)
2628                 log_link_warning_errno(link, r, "Cannot set IPv6 hop limit for interface: %m");
2629
2630         return 0;
2631 }
2632
2633 static int link_set_ipv6_mtu(Link *link) {
2634         int r;
2635
2636         /* Make this a NOP if IPv6 is not available */
2637         if (!socket_ipv6_is_supported())
2638                 return 0;
2639
2640         if (link->flags & IFF_LOOPBACK)
2641                 return 0;
2642
2643         if (link->network->ipv6_mtu == 0)
2644                 return 0;
2645
2646         /* IPv6 protocol requires a minimum MTU of IPV6_MTU_MIN(1280) bytes
2647          * on the interface. Bump up IPv6 MTU bytes to IPV6_MTU_MIN. */
2648         if (link->network->ipv6_mtu < IPV6_MIN_MTU) {
2649                 log_link_notice(link, "Bumping IPv6 MTU to "STRINGIFY(IPV6_MIN_MTU)" byte minimum required");
2650                 link->network->ipv6_mtu = IPV6_MIN_MTU;
2651         }
2652
2653         r = sysctl_write_ip_property_uint32(AF_INET6, link->ifname, "mtu", link->network->ipv6_mtu);
2654         if (r < 0) {
2655                 if (link->mtu < link->network->ipv6_mtu)
2656                         log_link_warning(link, "Cannot set IPv6 MTU %"PRIu32" higher than device MTU %"PRIu32,
2657                                          link->network->ipv6_mtu, link->mtu);
2658                 else
2659                         log_link_warning_errno(link, r, "Cannot set IPv6 MTU for interface: %m");
2660         }
2661
2662         link->ipv6_mtu_set = true;
2663
2664         return 0;
2665 }
2666
2667 static int link_set_ipv4_accept_local(Link *link) {
2668         int r;
2669
2670         if (link->flags & IFF_LOOPBACK)
2671                 return 0;
2672
2673         if (link->network->ipv4_accept_local < 0)
2674                 return 0;
2675
2676         r = sysctl_write_ip_property_boolean(AF_INET, link->ifname, "accept_local", link->network->ipv4_accept_local);
2677         if (r < 0)
2678                 log_link_warning_errno(link, r, "Cannot set IPv4 accept_local flag for interface: %m");
2679
2680         return 0;
2681 }
2682
2683 static bool link_is_static_address_configured(Link *link, Address *address) {
2684         Address *net_address;
2685
2686         assert(link);
2687         assert(address);
2688
2689         if (!link->network)
2690                 return false;
2691
2692         LIST_FOREACH(addresses, net_address, link->network->static_addresses)
2693                 if (address_equal(net_address, address))
2694                         return true;
2695                 else if (address->family == AF_INET6 && net_address->family == AF_INET6 &&
2696                          in_addr_equal(AF_INET6, &address->in_addr, &net_address->in_addr_peer) > 0)
2697                         return true;
2698
2699         return false;
2700 }
2701
2702 static bool link_is_neighbor_configured(Link *link, Neighbor *neighbor) {
2703         Neighbor *net_neighbor;
2704
2705         assert(link);
2706         assert(neighbor);
2707
2708         if (!link->network)
2709                 return false;
2710
2711         LIST_FOREACH(neighbors, net_neighbor, link->network->neighbors)
2712                 if (neighbor_equal(net_neighbor, neighbor))
2713                         return true;
2714
2715         return false;
2716 }
2717
2718 static bool link_is_static_route_configured(Link *link, Route *route) {
2719         Route *net_route;
2720
2721         assert(link);
2722         assert(route);
2723
2724         if (!link->network)
2725                 return false;
2726
2727         LIST_FOREACH(routes, net_route, link->network->static_routes)
2728                 if (route_equal(net_route, route))
2729                         return true;
2730
2731         return false;
2732 }
2733
2734 static bool link_address_is_dynamic(Link *link, Address *address) {
2735         Route *route;
2736
2737         assert(link);
2738         assert(address);
2739
2740         if (address->cinfo.ifa_prefered != CACHE_INFO_INFINITY_LIFE_TIME)
2741                 return true;
2742
2743         /* Even when the address is leased from a DHCP server, networkd assign the address
2744          * without lifetime when KeepConfiguration=dhcp. So, let's check that we have
2745          * corresponding routes with RTPROT_DHCP. */
2746         SET_FOREACH(route, link->routes_foreign) {
2747                 if (route->protocol != RTPROT_DHCP)
2748                         continue;
2749
2750                 if (address->family != route->family)
2751                         continue;
2752
2753                 if (in_addr_equal(address->family, &address->in_addr, &route->prefsrc))
2754                         return true;
2755         }
2756
2757         return false;
2758 }
2759
2760 static int link_enumerate_ipv6_tentative_addresses(Link *link) {
2761         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL, *reply = NULL;
2762         sd_netlink_message *addr;
2763         int r;
2764
2765         assert(link);
2766         assert(link->manager);
2767         assert(link->manager->rtnl);
2768
2769         r = sd_rtnl_message_new_addr(link->manager->rtnl, &req, RTM_GETADDR, 0, AF_INET6);
2770         if (r < 0)
2771                 return r;
2772
2773         r = sd_netlink_call(link->manager->rtnl, req, 0, &reply);
2774         if (r < 0)
2775                 return r;
2776
2777         for (addr = reply; addr; addr = sd_netlink_message_next(addr)) {
2778                 unsigned char flags;
2779                 int ifindex;
2780
2781                 r = sd_rtnl_message_addr_get_ifindex(addr, &ifindex);
2782                 if (r < 0) {
2783                         log_link_warning_errno(link, r, "rtnl: invalid ifindex, ignoring: %m");
2784                         continue;
2785                 } else if (link->ifindex != ifindex)
2786                         continue;
2787
2788                 r = sd_rtnl_message_addr_get_flags(addr, &flags);
2789                 if (r < 0) {
2790                         log_link_warning_errno(link, r, "rtnl: received address message with invalid flags, ignoring: %m");
2791                         continue;
2792                 } else if (!(flags & IFA_F_TENTATIVE))
2793                         continue;
2794
2795                 log_link_debug(link, "Found tentative ipv6 link-local address");
2796                 (void) manager_rtnl_process_address(link->manager->rtnl, addr, link->manager);
2797         }
2798
2799         return 0;
2800 }
2801
2802 static int link_drop_foreign_config(Link *link) {
2803         Address *address;
2804         Neighbor *neighbor;
2805         Route *route;
2806         int r;
2807
2808         /* The kernel doesn't notify us about tentative addresses;
2809          * so if ipv6ll is disabled, we need to enumerate them now so we can drop them below */
2810         if (!link_ipv6ll_enabled(link)) {
2811                 r = link_enumerate_ipv6_tentative_addresses(link);
2812                 if (r < 0)
2813                         return r;
2814         }
2815
2816         SET_FOREACH(address, link->addresses_foreign) {
2817                 /* we consider IPv6LL addresses to be managed by the kernel */
2818                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2819                         continue;
2820
2821                 if (link_address_is_dynamic(link, address)) {
2822                         if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2823                                 continue;
2824                 } else if (link->network && FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2825                         continue;
2826
2827                 if (link_is_static_address_configured(link, address)) {
2828                         r = address_add(link, address->family, &address->in_addr, address->prefixlen, NULL);
2829                         if (r < 0)
2830                                 return log_link_error_errno(link, r, "Failed to add address: %m");
2831                 } else {
2832                         r = address_remove(address, link, NULL);
2833                         if (r < 0)
2834                                 return r;
2835                 }
2836         }
2837
2838         SET_FOREACH(neighbor, link->neighbors_foreign) {
2839                 if (link_is_neighbor_configured(link, neighbor)) {
2840                         r = neighbor_add(link, neighbor->family, &neighbor->in_addr, &neighbor->lladdr, neighbor->lladdr_size, NULL);
2841                         if (r < 0)
2842                                 return r;
2843                 } else {
2844                         r = neighbor_remove(neighbor, link, NULL);
2845                         if (r < 0)
2846                                 return r;
2847                 }
2848         }
2849
2850         SET_FOREACH(route, link->routes_foreign) {
2851                 /* do not touch routes managed by the kernel */
2852                 if (route->protocol == RTPROT_KERNEL)
2853                         continue;
2854
2855                 /* do not touch multicast route added by kernel */
2856                 /* FIXME: Why the kernel adds this route with protocol RTPROT_BOOT??? We need to investigate that.
2857                  * https://tools.ietf.org/html/rfc4862#section-5.4 may explain why. */
2858                 if (route->protocol == RTPROT_BOOT &&
2859                     route->family == AF_INET6 &&
2860                     route->dst_prefixlen == 8 &&
2861                     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 }}} }))
2862                         continue;
2863
2864                 if (route->protocol == RTPROT_STATIC && link->network &&
2865                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_STATIC))
2866                         continue;
2867
2868                 if (route->protocol == RTPROT_DHCP && link->network &&
2869                     FLAGS_SET(link->network->keep_configuration, KEEP_CONFIGURATION_DHCP))
2870                         continue;
2871
2872                 if (link_is_static_route_configured(link, route)) {
2873                         r = route_add(link, route, NULL);
2874                         if (r < 0)
2875                                 return r;
2876                 } else {
2877                         r = route_remove(route, link, NULL);
2878                         if (r < 0)
2879                                 return r;
2880                 }
2881         }
2882
2883         return 0;
2884 }
2885
2886 static int remove_static_address_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
2887         int r;
2888
2889         assert(m);
2890         assert(link);
2891         assert(link->ifname);
2892         assert(link->address_remove_messages > 0);
2893
2894         link->address_remove_messages--;
2895
2896         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
2897                 return 1;
2898
2899         r = sd_netlink_message_get_errno(m);
2900         if (r < 0 && r != -EADDRNOTAVAIL)
2901                 log_link_message_warning_errno(link, m, r, "Could not drop address");
2902         else if (r >= 0)
2903                 (void) manager_rtnl_process_address(rtnl, m, link->manager);
2904
2905         if (link->address_remove_messages == 0 && link->request_static_addresses) {
2906                 link_set_state(link, LINK_STATE_CONFIGURING);
2907                 r = link_request_set_addresses(link);
2908                 if (r < 0)
2909                         link_enter_failed(link);
2910         }
2911
2912         return 1;
2913 }
2914
2915 static int link_drop_config(Link *link) {
2916         Address *address, *pool_address;
2917         Neighbor *neighbor;
2918         Route *route;
2919         int r;
2920
2921         SET_FOREACH(address, link->addresses) {
2922                 /* we consider IPv6LL addresses to be managed by the kernel */
2923                 if (address->family == AF_INET6 && in_addr_is_link_local(AF_INET6, &address->in_addr) == 1 && link_ipv6ll_enabled(link))
2924                         continue;
2925
2926                 r = address_remove(address, link, remove_static_address_handler);
2927                 if (r < 0)
2928                         return r;
2929
2930                 link->address_remove_messages++;
2931
2932                 /* If this address came from an address pool, clean up the pool */
2933                 LIST_FOREACH(addresses, pool_address, link->pool_addresses)
2934                         if (address_equal(address, pool_address)) {
2935                                 LIST_REMOVE(addresses, link->pool_addresses, pool_address);
2936                                 address_free(pool_address);
2937                                 break;
2938                         }
2939         }
2940
2941         SET_FOREACH(neighbor, link->neighbors) {
2942                 r = neighbor_remove(neighbor, link, NULL);
2943                 if (r < 0)
2944                         return r;
2945         }
2946
2947         SET_FOREACH(route, link->routes) {
2948                 /* do not touch routes managed by the kernel */
2949                 if (route->protocol == RTPROT_KERNEL)
2950                         continue;
2951
2952                 r = route_remove(route, link, NULL);
2953                 if (r < 0)
2954                         return r;
2955         }
2956
2957         ndisc_flush(link);
2958
2959         return 0;
2960 }
2961
2962 static int link_configure_ipv4_dad(Link *link) {
2963         Address *address;
2964         int r;
2965
2966         assert(link);
2967         assert(link->network);
2968
2969         LIST_FOREACH(addresses, address, link->network->static_addresses)
2970                 if (address->family == AF_INET &&
2971                     FLAGS_SET(address->duplicate_address_detection, ADDRESS_FAMILY_IPV4)) {
2972                         r = configure_ipv4_duplicate_address_detection(link, address);
2973                         if (r < 0)
2974                                 return log_link_error_errno(link, r, "Failed to configure IPv4ACD: %m");
2975                 }
2976
2977         return 0;
2978 }
2979
2980 static int link_configure_traffic_control(Link *link) {
2981         TrafficControl *tc;
2982         int r;
2983
2984         link->tc_configured = false;
2985         link->tc_messages = 0;
2986
2987         ORDERED_HASHMAP_FOREACH(tc, link->network->tc_by_section) {
2988                 r = traffic_control_configure(link, tc);
2989                 if (r < 0)
2990                         return r;
2991         }
2992
2993         if (link->tc_messages == 0)
2994                 link->tc_configured = true;
2995         else
2996                 log_link_debug(link, "Configuring traffic control");
2997
2998         return 0;
2999 }
3000
3001 static int link_configure_sr_iov(Link *link) {
3002         SRIOV *sr_iov;
3003         int r;
3004
3005         link->sr_iov_configured = false;
3006         link->sr_iov_messages = 0;
3007
3008         ORDERED_HASHMAP_FOREACH(sr_iov, link->network->sr_iov_by_section) {
3009                 r = sr_iov_configure(link, sr_iov);
3010                 if (r < 0)
3011                         return r;
3012         }
3013
3014         if (link->sr_iov_messages == 0)
3015                 link->sr_iov_configured = true;
3016         else
3017                 log_link_debug(link, "Configuring SR-IOV");
3018
3019         return 0;
3020 }
3021
3022 static int link_configure(Link *link) {
3023         int r;
3024
3025         assert(link);
3026         assert(link->network);
3027         assert(link->state == LINK_STATE_INITIALIZED);
3028
3029         r = link_configure_traffic_control(link);
3030         if (r < 0)
3031                 return r;
3032
3033         r = link_configure_sr_iov(link);
3034         if (r < 0)
3035                 return r;
3036
3037         if (link->iftype == ARPHRD_CAN)
3038                 return link_configure_can(link);
3039
3040         /* If IPv6 configured that is static IPv6 address and IPv6LL autoconfiguration is enabled
3041          * for this interface, then enable IPv6 */
3042         (void) link_update_ipv6_sysctl(link);
3043
3044         r = link_set_proxy_arp(link);
3045         if (r < 0)
3046                return r;
3047
3048         r = ipv6_proxy_ndp_addresses_configure(link);
3049         if (r < 0)
3050                 return r;
3051
3052         r = link_set_ipv4_forward(link);
3053         if (r < 0)
3054                 return r;
3055
3056         r = link_set_ipv6_forward(link);
3057         if (r < 0)
3058                 return r;
3059
3060         r = link_set_ipv6_privacy_extensions(link);
3061         if (r < 0)
3062                 return r;
3063
3064         r = link_set_ipv6_accept_ra(link);
3065         if (r < 0)
3066                 return r;
3067
3068         r = link_set_ipv6_dad_transmits(link);
3069         if (r < 0)
3070                 return r;
3071
3072         r = link_set_ipv6_hop_limit(link);
3073         if (r < 0)
3074                 return r;
3075
3076         r = link_set_ipv4_accept_local(link);
3077         if (r < 0)
3078                 return r;
3079
3080         r = link_set_flags(link);
3081         if (r < 0)
3082                 return r;
3083
3084         r = link_set_group(link);
3085         if (r < 0)
3086                 return r;
3087
3088         if (link_ipv4ll_enabled(link, ADDRESS_FAMILY_IPV4 | ADDRESS_FAMILY_FALLBACK_IPV4)) {
3089                 r = ipv4ll_configure(link);
3090                 if (r < 0)
3091                         return r;
3092         }
3093
3094         if (link_dhcp4_enabled(link)) {
3095                 r = dhcp4_set_promote_secondaries(link);
3096                 if (r < 0)
3097                         return r;
3098
3099                 r = dhcp4_configure(link);
3100                 if (r < 0)
3101                         return r;
3102         }
3103
3104         if (link_dhcp4_server_enabled(link)) {
3105                 r = sd_dhcp_server_new(&link->dhcp_server, link->ifindex);
3106                 if (r < 0)
3107                         return r;
3108
3109                 r = sd_dhcp_server_attach_event(link->dhcp_server, NULL, 0);
3110                 if (r < 0)
3111                         return r;
3112         }
3113
3114         if (link_dhcp6_enabled(link) ||
3115             link_ipv6_accept_ra_enabled(link)) {
3116                 r = dhcp6_configure(link);
3117                 if (r < 0)
3118                         return r;
3119         }
3120
3121         if (link_ipv6_accept_ra_enabled(link)) {
3122                 r = ndisc_configure(link);
3123                 if (r < 0)
3124                         return r;
3125         }
3126
3127         if (link_radv_enabled(link)) {
3128                 r = radv_configure(link);
3129                 if (r < 0)
3130                         return r;
3131         }
3132
3133         if (link_lldp_rx_enabled(link)) {
3134                 r = link_lldp_rx_configure(link);
3135                 if (r < 0)
3136                         return r;
3137         }
3138
3139         r = link_configure_mtu(link);
3140         if (r < 0)
3141                 return r;
3142
3143         r = link_configure_addrgen_mode(link);
3144         if (r < 0)
3145                 return r;
3146
3147         r = link_configure_ipv4_dad(link);
3148         if (r < 0)
3149                 return r;
3150
3151         return link_configure_continue(link);
3152 }
3153
3154 /* The configuration continues in this separate function, instead of
3155  * including this in the above link_configure() function, for two
3156  * reasons:
3157  * 1) some devices reset the link when the mtu is set, which caused
3158  *    an infinite loop here in networkd; see:
3159  *    https://github.com/systemd/systemd/issues/6593
3160  *    https://github.com/systemd/systemd/issues/9831
3161  * 2) if ipv6ll is disabled, then bringing the interface up must be
3162  *    delayed until after we get confirmation from the kernel that
3163  *    the addr_gen_mode parameter has been set (via netlink), see:
3164  *    https://github.com/systemd/systemd/issues/13882
3165  */
3166 static int link_configure_continue(Link *link) {
3167         int r;
3168
3169         assert(link);
3170         assert(link->network);
3171         assert(link->state == LINK_STATE_INITIALIZED);
3172
3173         if (link->setting_mtu || link->setting_genmode)
3174                 return 0;
3175
3176         /* Drop foreign config, but ignore loopback or critical devices.
3177          * We do not want to remove loopback address or addresses used for root NFS. */
3178         if (!(link->flags & IFF_LOOPBACK) &&
3179             link->network->keep_configuration != KEEP_CONFIGURATION_YES) {
3180                 r = link_drop_foreign_config(link);
3181                 if (r < 0)
3182                         return r;
3183         }
3184
3185         /* The kernel resets ipv6 mtu after changing device mtu;
3186          * we must set this here, after we've set device mtu */
3187         r = link_set_ipv6_mtu(link);
3188         if (r < 0)
3189                 return r;
3190
3191         if (link_has_carrier(link) || link->network->configure_without_carrier) {
3192                 r = link_acquire_conf(link);
3193                 if (r < 0)
3194                         return r;
3195         }
3196
3197         return link_enter_join_netdev(link);
3198 }
3199
3200 static int duid_set_uuid(DUID *duid, sd_id128_t uuid) {
3201         assert(duid);
3202
3203         if (duid->raw_data_len > 0)
3204                 return 0;
3205
3206         if (duid->type != DUID_TYPE_UUID)
3207                 return -EINVAL;
3208
3209         memcpy(&duid->raw_data, &uuid, sizeof(sd_id128_t));
3210         duid->raw_data_len = sizeof(sd_id128_t);
3211
3212         return 1;
3213 }
3214
3215 int get_product_uuid_handler(sd_bus_message *m, void *userdata, sd_bus_error *ret_error) {
3216         Manager *manager = userdata;
3217         const sd_bus_error *e;
3218         const void *a;
3219         size_t sz;
3220         DUID *duid;
3221         Link *link;
3222         int r;
3223
3224         assert(m);
3225         assert(manager);
3226
3227         e = sd_bus_message_get_error(m);
3228         if (e) {
3229                 log_error_errno(sd_bus_error_get_errno(e),
3230                                 "Could not get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %s",
3231                                 e->message);
3232                 goto configure;
3233         }
3234
3235         r = sd_bus_message_read_array(m, 'y', &a, &sz);
3236         if (r < 0)
3237                 goto configure;
3238
3239         if (sz != sizeof(sd_id128_t)) {
3240                 log_error("Invalid product UUID. Falling back to use machine-app-specific ID as DUID-UUID.");
3241                 goto configure;
3242         }
3243
3244         memcpy(&manager->product_uuid, a, sz);
3245         while ((duid = set_steal_first(manager->duids_requesting_uuid)))
3246                 (void) duid_set_uuid(duid, manager->product_uuid);
3247
3248         manager->duids_requesting_uuid = set_free(manager->duids_requesting_uuid);
3249
3250 configure:
3251         while ((link = set_steal_first(manager->links_requesting_uuid))) {
3252                 link_unref(link);
3253
3254                 r = link_configure(link);
3255                 if (r < 0)
3256                         link_enter_failed(link);
3257         }
3258
3259         manager->links_requesting_uuid = set_free(manager->links_requesting_uuid);
3260
3261         /* To avoid calling GetProductUUID() bus method so frequently, set the flag below
3262          * even if the method fails. */
3263         manager->has_product_uuid = true;
3264
3265         return 1;
3266 }
3267
3268 static bool link_requires_uuid(Link *link) {
3269         const DUID *duid;
3270
3271         assert(link);
3272         assert(link->manager);
3273         assert(link->network);
3274
3275         duid = link_get_duid(link);
3276         if (duid->type != DUID_TYPE_UUID || duid->raw_data_len != 0)
3277                 return false;
3278
3279         if (link_dhcp4_enabled(link) && IN_SET(link->network->dhcp_client_identifier, DHCP_CLIENT_ID_DUID, DHCP_CLIENT_ID_DUID_ONLY))
3280                 return true;
3281
3282         if (link_dhcp6_enabled(link) || link_ipv6_accept_ra_enabled(link))
3283                 return true;
3284
3285         return false;
3286 }
3287
3288 static int link_configure_duid(Link *link) {
3289         Manager *m;
3290         DUID *duid;
3291         int r;
3292
3293         assert(link);
3294         assert(link->manager);
3295         assert(link->network);
3296
3297         m = link->manager;
3298         duid = link_get_duid(link);
3299
3300         if (!link_requires_uuid(link))
3301                 return 1;
3302
3303         if (m->has_product_uuid) {
3304                 (void) duid_set_uuid(duid, m->product_uuid);
3305                 return 1;
3306         }
3307
3308         if (!m->links_requesting_uuid) {
3309                 r = manager_request_product_uuid(m, link);
3310                 if (r < 0) {
3311                         if (r == -ENOMEM)
3312                                 return r;
3313
3314                         log_link_warning_errno(link, r,
3315                                                "Failed to get product UUID. Falling back to use machine-app-specific ID as DUID-UUID: %m");
3316                         return 1;
3317                 }
3318         } else {
3319                 r = set_put(m->links_requesting_uuid, link);
3320                 if (r < 0)
3321                         return log_oom();
3322                 if (r > 0)
3323                         link_ref(link);
3324
3325                 r = set_put(m->duids_requesting_uuid, duid);
3326                 if (r < 0)
3327                         return log_oom();
3328         }
3329
3330         return 0;
3331 }
3332
3333 static int link_reconfigure_internal(Link *link, sd_netlink_message *m, bool force) {
3334         Network *network;
3335         int r;
3336
3337         if (m) {
3338                 _cleanup_strv_free_ char **s = NULL;
3339
3340                 r = sd_netlink_message_get_errno(m);
3341                 if (r < 0)
3342                         return r;
3343
3344                 r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3345                 if (r < 0 && r != -ENODATA)
3346                         return r;
3347
3348                 strv_free_and_replace(link->alternative_names, s);
3349         }
3350
3351         r = network_get(link->manager, link->iftype, link->sd_device,
3352                         link->ifname, link->alternative_names, link->driver,
3353                         &link->mac, &link->permanent_mac,
3354                         link->wlan_iftype, link->ssid, &link->bssid, &network);
3355         if (r == -ENOENT) {
3356                 link_enter_unmanaged(link);
3357                 return 0;
3358         } else if (r == 0 && network->unmanaged) {
3359                 link_enter_unmanaged(link);
3360                 return 0;
3361         } else if (r < 0)
3362                 return r;
3363
3364         if (link->network == network && !force)
3365                 return 0;
3366
3367         log_link_info(link, "Re-configuring with %s", network->filename);
3368
3369         /* Dropping old .network file */
3370         r = link_stop_clients(link, false);
3371         if (r < 0)
3372                 return r;
3373
3374         if (link_dhcp4_server_enabled(link))
3375                 (void) sd_dhcp_server_stop(link->dhcp_server);
3376
3377         r = link_drop_config(link);
3378         if (r < 0)
3379                 return r;
3380
3381         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3382                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3383                 r = link_drop_foreign_config(link);
3384                 if (r < 0)
3385                         return r;
3386         }
3387
3388         link_free_carrier_maps(link);
3389         link_free_engines(link);
3390         link->network = network_unref(link->network);
3391
3392         /* Then, apply new .network file */
3393         r = network_apply(network, link);
3394         if (r < 0)
3395                 return r;
3396
3397         r = link_new_carrier_maps(link);
3398         if (r < 0)
3399                 return r;
3400
3401         link_set_state(link, LINK_STATE_INITIALIZED);
3402         link_dirty(link);
3403
3404         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3405          * link_configure() is called later asynchronously. */
3406         r = link_configure_duid(link);
3407         if (r <= 0)
3408                 return r;
3409
3410         r = link_configure(link);
3411         if (r < 0)
3412                 return r;
3413
3414         return 0;
3415 }
3416
3417 static int link_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3418         int r;
3419
3420         r = link_reconfigure_internal(link, m, false);
3421         if (r < 0)
3422                 link_enter_failed(link);
3423
3424         return 1;
3425 }
3426
3427 static int link_force_reconfigure_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3428         int r;
3429
3430         r = link_reconfigure_internal(link, m, true);
3431         if (r < 0)
3432                 link_enter_failed(link);
3433
3434         return 1;
3435 }
3436
3437 int link_reconfigure(Link *link, bool force) {
3438         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3439         int r;
3440
3441         if (IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_LINGER))
3442                 return 0;
3443
3444         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3445                                      link->ifindex);
3446         if (r < 0)
3447                 return r;
3448
3449         r = netlink_call_async(link->manager->rtnl, NULL, req,
3450                                force ? link_force_reconfigure_handler : link_reconfigure_handler,
3451                                link_netlink_destroy_callback, link);
3452         if (r < 0)
3453                 return r;
3454
3455         link_ref(link);
3456
3457         return 0;
3458 }
3459
3460 static int link_initialized_and_synced(Link *link) {
3461         Network *network;
3462         int r;
3463
3464         assert(link);
3465         assert(link->ifname);
3466         assert(link->manager);
3467
3468         /* We may get called either from the asynchronous netlink callback,
3469          * or directly for link_add() if running in a container. See link_add(). */
3470         if (!IN_SET(link->state, LINK_STATE_PENDING, LINK_STATE_INITIALIZED))
3471                 return 0;
3472
3473         log_link_debug(link, "Link state is up-to-date");
3474         link_set_state(link, LINK_STATE_INITIALIZED);
3475
3476         r = link_new_bound_by_list(link);
3477         if (r < 0)
3478                 return r;
3479
3480         r = link_handle_bound_by_list(link);
3481         if (r < 0)
3482                 return r;
3483
3484         if (!link->network) {
3485                 r = wifi_get_info(link);
3486                 if (r < 0)
3487                         return r;
3488
3489                 r = network_get(link->manager, link->iftype, link->sd_device,
3490                                 link->ifname, link->alternative_names, link->driver,
3491                                 &link->mac, &link->permanent_mac,
3492                                 link->wlan_iftype, link->ssid, &link->bssid, &network);
3493                 if (r == -ENOENT) {
3494                         link_enter_unmanaged(link);
3495                         return 0;
3496                 } else if (r == 0 && network->unmanaged) {
3497                         link_enter_unmanaged(link);
3498                         return 0;
3499                 } else if (r < 0)
3500                         return r;
3501
3502                 if (link->flags & IFF_LOOPBACK) {
3503                         if (network->link_local != ADDRESS_FAMILY_NO)
3504                                 log_link_debug(link, "Ignoring link-local autoconfiguration for loopback link");
3505
3506                         if (network->dhcp != ADDRESS_FAMILY_NO)
3507                                 log_link_debug(link, "Ignoring DHCP clients for loopback link");
3508
3509                         if (network->dhcp_server)
3510                                 log_link_debug(link, "Ignoring DHCP server for loopback link");
3511                 }
3512
3513                 r = network_apply(network, link);
3514                 if (r < 0)
3515                         return r;
3516         }
3517
3518         r = link_new_bound_to_list(link);
3519         if (r < 0)
3520                 return r;
3521
3522         /* link_configure_duid() returns 0 if it requests product UUID. In that case,
3523          * link_configure() is called later asynchronously. */
3524         r = link_configure_duid(link);
3525         if (r <= 0)
3526                 return r;
3527
3528         r = link_configure(link);
3529         if (r < 0)
3530                 return r;
3531
3532         return 0;
3533 }
3534
3535 static int link_initialized_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
3536         _cleanup_strv_free_ char **s = NULL;
3537         int r;
3538
3539         r = sd_netlink_message_get_errno(m);
3540         if (r < 0) {
3541                 log_link_warning_errno(link, r, "Failed to wait for the interface to be initialized: %m");
3542                 link_enter_failed(link);
3543                 return 0;
3544         }
3545
3546         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
3547         if (r < 0 && r != -ENODATA) {
3548                 link_enter_failed(link);
3549                 return 0;
3550         }
3551
3552         strv_free_and_replace(link->alternative_names, s);
3553
3554         r = link_initialized_and_synced(link);
3555         if (r < 0)
3556                 link_enter_failed(link);
3557         return 1;
3558 }
3559
3560 int link_initialized(Link *link, sd_device *device) {
3561         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
3562         int r;
3563
3564         assert(link);
3565         assert(link->manager);
3566         assert(link->manager->rtnl);
3567         assert(device);
3568
3569         if (link->state != LINK_STATE_PENDING)
3570                 return 0;
3571
3572         if (link->sd_device)
3573                 return 0;
3574
3575         log_link_debug(link, "udev initialized link");
3576         link_set_state(link, LINK_STATE_INITIALIZED);
3577
3578         link->sd_device = sd_device_ref(device);
3579
3580         /* udev has initialized the link, but we don't know if we have yet
3581          * processed the NEWLINK messages with the latest state. Do a GETLINK,
3582          * when it returns we know that the pending NEWLINKs have already been
3583          * processed and that we are up-to-date */
3584
3585         r = sd_rtnl_message_new_link(link->manager->rtnl, &req, RTM_GETLINK,
3586                                      link->ifindex);
3587         if (r < 0)
3588                 return r;
3589
3590         r = netlink_call_async(link->manager->rtnl, NULL, req, link_initialized_handler,
3591                                link_netlink_destroy_callback, link);
3592         if (r < 0)
3593                 return r;
3594
3595         link_ref(link);
3596
3597         return 0;
3598 }
3599
3600 static int link_load(Link *link) {
3601         _cleanup_free_ char *network_file = NULL,
3602                             *addresses = NULL,
3603                             *routes = NULL,
3604                             *dhcp4_address = NULL,
3605                             *ipv4ll_address = NULL;
3606         union in_addr_union address;
3607         int r;
3608
3609         assert(link);
3610
3611         r = parse_env_file(NULL, link->state_file,
3612                            "NETWORK_FILE", &network_file,
3613                            "ADDRESSES", &addresses,
3614                            "ROUTES", &routes,
3615                            "DHCP4_ADDRESS", &dhcp4_address,
3616                            "IPV4LL_ADDRESS", &ipv4ll_address);
3617         if (r < 0 && r != -ENOENT)
3618                 return log_link_error_errno(link, r, "Failed to read %s: %m", link->state_file);
3619
3620         if (network_file) {
3621                 Network *network;
3622                 char *suffix;
3623
3624                 /* drop suffix */
3625                 suffix = strrchr(network_file, '.');
3626                 if (!suffix) {
3627                         log_link_debug(link, "Failed to get network name from %s", network_file);
3628                         goto network_file_fail;
3629                 }
3630                 *suffix = '\0';
3631
3632                 r = network_get_by_name(link->manager, basename(network_file), &network);
3633                 if (r < 0) {
3634                         log_link_debug_errno(link, r, "Failed to get network %s: %m", basename(network_file));
3635                         goto network_file_fail;
3636                 }
3637
3638                 r = network_apply(network, link);
3639                 if (r < 0)
3640                         return log_link_error_errno(link, r, "Failed to apply network %s: %m", basename(network_file));
3641         }
3642
3643 network_file_fail:
3644
3645         for (const char *p = addresses; p; ) {
3646                 _cleanup_free_ char *address_str = NULL;
3647                 char *prefixlen_str;
3648                 int family;
3649                 unsigned char prefixlen;
3650
3651                 r = extract_first_word(&p, &address_str, NULL, 0);
3652                 if (r < 0)
3653                         log_link_warning_errno(link, r, "failed to parse ADDRESSES: %m");
3654                 if (r <= 0)
3655                         break;
3656
3657                 prefixlen_str = strchr(address_str, '/');
3658                 if (!prefixlen_str) {
3659                         log_link_debug(link, "Failed to parse address and prefix length %s", address_str);
3660                         continue;
3661                 }
3662                 *prefixlen_str++ = '\0';
3663
3664                 r = sscanf(prefixlen_str, "%hhu", &prefixlen);
3665                 if (r != 1) {
3666                         log_link_error(link, "Failed to parse prefixlen %s", prefixlen_str);
3667                         continue;
3668                 }
3669
3670                 r = in_addr_from_string_auto(address_str, &family, &address);
3671                 if (r < 0) {
3672                         log_link_debug_errno(link, r, "Failed to parse address %s: %m", address_str);
3673                         continue;
3674                 }
3675
3676                 r = address_add(link, family, &address, prefixlen, NULL);
3677                 if (r < 0)
3678                         return log_link_error_errno(link, r, "Failed to add address: %m");
3679         }
3680
3681         for (const char *p = routes; p; ) {
3682                 _cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
3683                 _cleanup_(route_freep) Route *tmp = NULL;
3684                 _cleanup_free_ char *route_str = NULL;
3685                 char *prefixlen_str;
3686                 Route *route;
3687
3688                 r = extract_first_word(&p, &route_str, NULL, 0);
3689                 if (r < 0)
3690                         log_link_debug_errno(link, r, "failed to parse ROUTES: %m");
3691                 if (r <= 0)
3692                         break;
3693
3694                 prefixlen_str = strchr(route_str, '/');
3695                 if (!prefixlen_str) {
3696                         log_link_debug(link, "Failed to parse route %s", route_str);
3697                         continue;
3698                 }
3699                 *prefixlen_str++ = '\0';
3700
3701                 r = route_new(&tmp);
3702                 if (r < 0)
3703                         return log_oom();
3704
3705                 r = sscanf(prefixlen_str,
3706                            "%hhu/%hhu/%"SCNu32"/%"PRIu32"/"USEC_FMT,
3707                            &tmp->dst_prefixlen,
3708                            &tmp->tos,
3709                            &tmp->priority,
3710                            &tmp->table,
3711                            &tmp->lifetime);
3712                 if (r != 5) {
3713                         log_link_debug(link,
3714                                        "Failed to parse destination prefix length, tos, priority, table or expiration %s",
3715                                        prefixlen_str);
3716                         continue;
3717                 }
3718
3719                 r = in_addr_from_string_auto(route_str, &tmp->family, &tmp->dst);
3720                 if (r < 0) {
3721                         log_link_debug_errno(link, r, "Failed to parse route destination %s: %m", route_str);
3722                         continue;
3723                 }
3724
3725                 r = route_add(link, tmp, &route);
3726                 if (r < 0)
3727                         return log_link_error_errno(link, r, "Failed to add route: %m");
3728
3729                 if (route->lifetime != USEC_INFINITY && !kernel_route_expiration_supported()) {
3730                         r = sd_event_add_time(link->manager->event, &expire,
3731                                               clock_boottime_or_monotonic(),
3732                                               route->lifetime, 0, route_expire_handler, route);
3733                         if (r < 0)
3734                                 log_link_warning_errno(link, r, "Could not arm route expiration handler: %m");
3735                 }
3736
3737                 sd_event_source_unref(route->expire);
3738                 route->expire = TAKE_PTR(expire);
3739         }
3740
3741         if (dhcp4_address) {
3742                 r = in_addr_from_string(AF_INET, dhcp4_address, &address);
3743                 if (r < 0) {
3744                         log_link_debug_errno(link, r, "Failed to parse DHCPv4 address %s: %m", dhcp4_address);
3745                         goto dhcp4_address_fail;
3746                 }
3747
3748                 r = sd_dhcp_client_new(&link->dhcp_client, link->network ? link->network->dhcp_anonymize : 0);
3749                 if (r < 0)
3750                         return log_link_error_errno(link, r, "Failed to create DHCPv4 client: %m");
3751
3752                 r = sd_dhcp_client_attach_event(link->dhcp_client, NULL, 0);
3753                 if (r < 0)
3754                         return log_link_error_errno(link, r, "Failed to attach DHCPv4 event: %m");
3755
3756                 r = sd_dhcp_client_set_request_address(link->dhcp_client, &address.in);
3757                 if (r < 0)
3758                         return log_link_error_errno(link, r, "Failed to set initial DHCPv4 address %s: %m", dhcp4_address);
3759         }
3760
3761 dhcp4_address_fail:
3762
3763         if (ipv4ll_address) {
3764                 r = in_addr_from_string(AF_INET, ipv4ll_address, &address);
3765                 if (r < 0) {
3766                         log_link_debug_errno(link, r, "Failed to parse IPv4LL address %s: %m", ipv4ll_address);
3767                         goto ipv4ll_address_fail;
3768                 }
3769
3770                 r = sd_ipv4ll_new(&link->ipv4ll);
3771                 if (r < 0)
3772                         return log_link_error_errno(link, r, "Failed to create IPv4LL client: %m");
3773
3774                 r = sd_ipv4ll_attach_event(link->ipv4ll, NULL, 0);
3775                 if (r < 0)
3776                         return log_link_error_errno(link, r, "Failed to attach IPv4LL event: %m");
3777
3778                 r = sd_ipv4ll_set_address(link->ipv4ll, &address.in);
3779                 if (r < 0)
3780                         return log_link_error_errno(link, r, "Failed to set initial IPv4LL address %s: %m", ipv4ll_address);
3781         }
3782
3783 ipv4ll_address_fail:
3784
3785         return 0;
3786 }
3787
3788 int link_add(Manager *m, sd_netlink_message *message, Link **ret) {
3789         _cleanup_(sd_device_unrefp) sd_device *device = NULL;
3790         char ifindex_str[2 + DECIMAL_STR_MAX(int)];
3791         Link *link;
3792         int r;
3793
3794         assert(m);
3795         assert(m->rtnl);
3796         assert(message);
3797         assert(ret);
3798
3799         r = link_new(m, message, ret);
3800         if (r < 0)
3801                 return r;
3802
3803         link = *ret;
3804
3805         log_link_debug(link, "Link %d added", link->ifindex);
3806
3807         r = link_load(link);
3808         if (r < 0)
3809                 return r;
3810
3811         if (path_is_read_only_fs("/sys") <= 0) {
3812                 /* udev should be around */
3813                 sprintf(ifindex_str, "n%d", link->ifindex);
3814                 r = sd_device_new_from_device_id(&device, ifindex_str);
3815                 if (r < 0) {
3816                         log_link_warning_errno(link, r, "Could not find device, waiting for device initialization: %m");
3817                         return 0;
3818                 }
3819
3820                 r = sd_device_get_is_initialized(device);
3821                 if (r < 0) {
3822                         log_link_warning_errno(link, r, "Could not determine whether the device is initialized: %m");
3823                         goto failed;
3824                 }
3825                 if (r == 0) {
3826                         /* not yet ready */
3827                         log_link_debug(link, "link pending udev initialization...");
3828                         return 0;
3829                 }
3830
3831                 r = device_is_renaming(device);
3832                 if (r < 0) {
3833                         log_link_warning_errno(link, r, "Failed to determine the device is being renamed: %m");
3834                         goto failed;
3835                 }
3836                 if (r > 0) {
3837                         log_link_debug(link, "Interface is being renamed, pending initialization.");
3838                         return 0;
3839                 }
3840
3841                 r = link_initialized(link, device);
3842                 if (r < 0)
3843                         goto failed;
3844         } else {
3845                 r = link_initialized_and_synced(link);
3846                 if (r < 0)
3847                         goto failed;
3848         }
3849
3850         return 0;
3851 failed:
3852         link_enter_failed(link);
3853         return r;
3854 }
3855
3856 int link_ipv6ll_gained(Link *link, const struct in6_addr *address) {
3857         int r;
3858
3859         assert(link);
3860
3861         log_link_info(link, "Gained IPv6LL");
3862
3863         link->ipv6ll_address = *address;
3864         link_check_ready(link);
3865
3866         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3867                 r = link_acquire_ipv6_conf(link);
3868                 if (r < 0) {
3869                         link_enter_failed(link);
3870                         return r;
3871                 }
3872         }
3873
3874         return 0;
3875 }
3876
3877 static int link_carrier_gained(Link *link) {
3878         int r;
3879
3880         assert(link);
3881
3882         r = wifi_get_info(link);
3883         if (r < 0)
3884                 return r;
3885         if (r > 0) {
3886                 r = link_reconfigure_internal(link, NULL, false);
3887                 if (r < 0) {
3888                         link_enter_failed(link);
3889                         return r;
3890                 }
3891         }
3892
3893         if (IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED)) {
3894                 r = link_acquire_conf(link);
3895                 if (r < 0) {
3896                         link_enter_failed(link);
3897                         return r;
3898                 }
3899
3900                 link_set_state(link, LINK_STATE_CONFIGURING);
3901                 r = link_request_set_addresses(link);
3902                 if (r < 0)
3903                         return r;
3904         }
3905
3906         r = link_handle_bound_by_list(link);
3907         if (r < 0)
3908                 return r;
3909
3910         return 0;
3911 }
3912
3913 static int link_carrier_lost(Link *link) {
3914         int r;
3915
3916         assert(link);
3917
3918         if (link->network && link->network->ignore_carrier_loss)
3919                 return 0;
3920
3921         /* Some devices reset itself while setting the MTU. This causes the DHCP client fall into a loop.
3922          * setting_mtu keep track whether the device got reset because of setting MTU and does not drop the
3923          * configuration and stop the clients as well. */
3924         if (link->setting_mtu)
3925                 return 0;
3926
3927         r = link_stop_clients(link, false);
3928         if (r < 0) {
3929                 link_enter_failed(link);
3930                 return r;
3931         }
3932
3933         if (link_dhcp4_server_enabled(link))
3934                 (void) sd_dhcp_server_stop(link->dhcp_server);
3935
3936         r = link_drop_config(link);
3937         if (r < 0)
3938                 return r;
3939
3940         if (!IN_SET(link->state, LINK_STATE_UNMANAGED, LINK_STATE_PENDING, LINK_STATE_INITIALIZED)) {
3941                 log_link_debug(link, "State is %s, dropping config", link_state_to_string(link->state));
3942                 r = link_drop_foreign_config(link);
3943                 if (r < 0)
3944                         return r;
3945         }
3946
3947         r = link_handle_bound_by_list(link);
3948         if (r < 0)
3949                 return r;
3950
3951         return 0;
3952 }
3953
3954 int link_carrier_reset(Link *link) {
3955         int r;
3956
3957         assert(link);
3958
3959         if (link_has_carrier(link)) {
3960                 r = link_carrier_lost(link);
3961                 if (r < 0)
3962                         return r;
3963
3964                 r = link_carrier_gained(link);
3965                 if (r < 0)
3966                         return r;
3967
3968                 log_link_info(link, "Reset carrier");
3969         }
3970
3971         return 0;
3972 }
3973
3974 /* This is called every time an interface admin state changes to up;
3975  * specifically, when IFF_UP flag changes from unset to set */
3976 static int link_admin_state_up(Link *link) {
3977         int r;
3978
3979         /* We set the ipv6 mtu after the device mtu, but the kernel resets
3980          * ipv6 mtu on NETDEV_UP, so we need to reset it.  The check for
3981          * ipv6_mtu_set prevents this from trying to set it too early before
3982          * the link->network has been setup; we only need to reset it
3983          * here if we've already set it during normal initialization. */
3984         if (link->ipv6_mtu_set) {
3985                 r = link_set_ipv6_mtu(link);
3986                 if (r < 0)
3987                         return r;
3988         }
3989
3990         return 0;
3991 }
3992
3993 int link_update(Link *link, sd_netlink_message *m) {
3994         _cleanup_strv_free_ char **s = NULL;
3995         struct ether_addr mac;
3996         const char *ifname;
3997         uint32_t mtu;
3998         bool had_carrier, carrier_gained, carrier_lost, link_was_admin_up;
3999         int old_master, r;
4000
4001         assert(link);
4002         assert(link->ifname);
4003         assert(m);
4004
4005         if (link->state == LINK_STATE_LINGER) {
4006                 log_link_info(link, "Link re-added");
4007                 link_set_state(link, LINK_STATE_CONFIGURING);
4008
4009                 r = link_new_carrier_maps(link);
4010                 if (r < 0)
4011                         return r;
4012         }
4013
4014         r = sd_netlink_message_read_string(m, IFLA_IFNAME, &ifname);
4015         if (r >= 0 && !streq(ifname, link->ifname)) {
4016                 Manager *manager = link->manager;
4017
4018                 log_link_info(link, "Interface name change detected, %s has been renamed to %s.", link->ifname, ifname);
4019
4020                 link_drop(link);
4021                 r = link_add(manager, m, &link);
4022                 if (r < 0)
4023                         return r;
4024         }
4025
4026         r = sd_netlink_message_read_strv(m, IFLA_PROP_LIST, IFLA_ALT_IFNAME, &s);
4027         if (r >= 0)
4028                 strv_free_and_replace(link->alternative_names, s);
4029
4030         r = sd_netlink_message_read_u32(m, IFLA_MTU, &mtu);
4031         if (r >= 0 && mtu > 0) {
4032                 link->mtu = mtu;
4033                 if (link->original_mtu == 0) {
4034                         link->original_mtu = mtu;
4035                         log_link_debug(link, "Saved original MTU: %" PRIu32, link->original_mtu);
4036                 }
4037
4038                 if (link->dhcp_client) {
4039                         r = sd_dhcp_client_set_mtu(link->dhcp_client,
4040                                                    link->mtu);
4041                         if (r < 0)
4042                                 return log_link_warning_errno(link, r, "Could not update MTU in DHCP client: %m");
4043                 }
4044
4045                 if (link->radv) {
4046                         r = sd_radv_set_mtu(link->radv, link->mtu);
4047                         if (r < 0)
4048                                 return log_link_warning_errno(link, r, "Could not set MTU for Router Advertisement: %m");
4049                 }
4050         }
4051
4052         /* The kernel may broadcast NEWLINK messages without the MAC address
4053            set, simply ignore them. */
4054         r = sd_netlink_message_read_ether_addr(m, IFLA_ADDRESS, &mac);
4055         if (r >= 0 && memcmp(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN) != 0) {
4056
4057                 memcpy(link->mac.ether_addr_octet, mac.ether_addr_octet, ETH_ALEN);
4058
4059                 log_link_debug(link, "Gained new MAC address: "
4060                                "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
4061                                mac.ether_addr_octet[0],
4062                                mac.ether_addr_octet[1],
4063                                mac.ether_addr_octet[2],
4064                                mac.ether_addr_octet[3],
4065                                mac.ether_addr_octet[4],
4066                                mac.ether_addr_octet[5]);
4067
4068                 if (link->ipv4ll) {
4069                         bool restart = sd_ipv4ll_is_running(link->ipv4ll) > 0;
4070
4071                         if (restart) {
4072                                 r = sd_ipv4ll_stop(link->ipv4ll);
4073                                 if (r < 0)
4074                                         return log_link_warning_errno(link, r, "Could not stop IPv4LL client: %m");
4075                         }
4076
4077                         r = sd_ipv4ll_set_mac(link->ipv4ll, &link->mac);
4078                         if (r < 0)
4079                                 return log_link_warning_errno(link, r, "Could not update MAC address in IPv4LL client: %m");
4080
4081                         if (restart) {
4082                                 r = sd_ipv4ll_start(link->ipv4ll);
4083                                 if (r < 0)
4084                                         return log_link_warning_errno(link, r, "Could not restart IPv4LL client: %m");
4085                         }
4086                 }
4087
4088                 if (link->dhcp_client) {
4089                         r = sd_dhcp_client_set_mac(link->dhcp_client,
4090                                                    (const uint8_t *) &link->mac,
4091                                                    sizeof (link->mac),
4092                                                    ARPHRD_ETHER);
4093                         if (r < 0)
4094                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCP client: %m");
4095
4096                         r = dhcp4_set_client_identifier(link);
4097                         if (r < 0)
4098                                 return log_link_warning_errno(link, r, "Could not set DHCP client identifier: %m");
4099                 }
4100
4101                 if (link->dhcp6_client) {
4102                         const DUID* duid = link_get_duid(link);
4103                         bool restart = sd_dhcp6_client_is_running(link->dhcp6_client) > 0;
4104
4105                         if (restart) {
4106                                 r = sd_dhcp6_client_stop(link->dhcp6_client);
4107                                 if (r < 0)
4108                                         return log_link_warning_errno(link, r, "Could not stop DHCPv6 client: %m");
4109                         }
4110
4111                         r = sd_dhcp6_client_set_mac(link->dhcp6_client,
4112                                                     (const uint8_t *) &link->mac,
4113                                                     sizeof (link->mac),
4114                                                     ARPHRD_ETHER);
4115                         if (r < 0)
4116                                 return log_link_warning_errno(link, r, "Could not update MAC address in DHCPv6 client: %m");
4117
4118                         if (link->network->iaid_set) {
4119                                 r = sd_dhcp6_client_set_iaid(link->dhcp6_client, link->network->iaid);
4120                                 if (r < 0)
4121                                         return log_link_warning_errno(link, r, "Could not update DHCPv6 IAID: %m");
4122                         }
4123
4124                         r = sd_dhcp6_client_set_duid(link->dhcp6_client,
4125                                                      duid->type,
4126                                                      duid->raw_data_len > 0 ? duid->raw_data : NULL,
4127                                                      duid->raw_data_len);
4128                         if (r < 0)
4129                                 return log_link_warning_errno(link, r, "Could not update DHCPv6 DUID: %m");
4130
4131                         if (restart) {
4132                                 r = sd_dhcp6_client_start(link->dhcp6_client);
4133                                 if (r < 0)
4134                                         return log_link_warning_errno(link, r, "Could not restart DHCPv6 client: %m");
4135                         }
4136                 }
4137
4138                 if (link->radv) {
4139                         bool restart = sd_radv_is_running(link->radv);
4140
4141                         if (restart) {
4142                                 r = sd_radv_stop(link->radv);
4143                                 if (r < 0)
4144                                         return log_link_warning_errno(link, r, "Could not stop Router Advertisement: %m");
4145                         }
4146
4147                         r = sd_radv_set_mac(link->radv, &link->mac);
4148                         if (r < 0)
4149                                 return log_link_warning_errno(link, r, "Could not update MAC for Router Advertisement: %m");
4150
4151                         if (restart) {
4152                                 r = sd_radv_start(link->radv);
4153                                 if (r < 0)
4154                                         return log_link_warning_errno(link, r, "Could not restart Router Advertisement: %m");
4155                         }
4156                 }
4157
4158                 if (link->ndisc) {
4159                         r = sd_ndisc_set_mac(link->ndisc, &link->mac);
4160                         if (r < 0)
4161                                 return log_link_warning_errno(link, r, "Could not update MAC for NDisc: %m");
4162                 }
4163         }
4164
4165         old_master = link->master_ifindex;
4166         (void) sd_netlink_message_read_u32(m, IFLA_MASTER, (uint32_t *) &link->master_ifindex);
4167
4168         link_was_admin_up = link->flags & IFF_UP;
4169         had_carrier = link_has_carrier(link);
4170
4171         r = link_update_flags(link, m, old_master != link->master_ifindex);
4172         if (r < 0)
4173                 return r;
4174
4175         if (!link_was_admin_up && (link->flags & IFF_UP)) {
4176                 log_link_info(link, "Link UP");
4177
4178                 r = link_admin_state_up(link);
4179                 if (r < 0)
4180                         return r;
4181         } else if (link_was_admin_up && !(link->flags & IFF_UP))
4182                 log_link_info(link, "Link DOWN");
4183
4184         r = link_update_lldp(link);
4185         if (r < 0)
4186                 return r;
4187
4188         carrier_gained = !had_carrier && link_has_carrier(link);
4189         carrier_lost = had_carrier && !link_has_carrier(link);
4190
4191         if (carrier_gained) {
4192                 log_link_info(link, "Gained carrier");
4193
4194                 r = link_carrier_gained(link);
4195                 if (r < 0)
4196                         return r;
4197         } else if (carrier_lost) {
4198                 log_link_info(link, "Lost carrier");
4199
4200                 r = link_carrier_lost(link);
4201                 if (r < 0)
4202                         return r;
4203         }
4204
4205         return 0;
4206 }
4207
4208 static void print_link_hashmap(FILE *f, const char *prefix, Hashmap* h) {
4209         bool space = false;
4210         Link *link;
4211
4212         assert(f);
4213         assert(prefix);
4214
4215         if (hashmap_isempty(h))
4216                 return;
4217
4218         fputs(prefix, f);
4219         HASHMAP_FOREACH(link, h) {
4220                 if (space)
4221                         fputc(' ', f);
4222
4223                 fprintf(f, "%i", link->ifindex);
4224                 space = true;
4225         }
4226
4227         fputc('\n', f);
4228 }
4229
4230 static void link_save_dns(Link *link, FILE *f, struct in_addr_full **dns, unsigned n_dns, bool *space) {
4231         for (unsigned j = 0; j < n_dns; j++) {
4232                 const char *str;
4233
4234                 if (dns[j]->ifindex != 0 && dns[j]->ifindex != link->ifindex)
4235                         continue;
4236
4237                 str = in_addr_full_to_string(dns[j]);
4238                 if (!str)
4239                         continue;
4240
4241                 if (*space)
4242                         fputc(' ', f);
4243                 fputs(str, f);
4244                 *space = true;
4245         }
4246 }
4247
4248 static void serialize_addresses(
4249                 FILE *f,
4250                 const char *lvalue,
4251                 bool *space,
4252                 char **addresses,
4253                 sd_dhcp_lease *lease,
4254                 bool conditional,
4255                 sd_dhcp_lease_server_type what,
4256                 sd_dhcp6_lease *lease6,
4257                 bool conditional6,
4258                 int (*lease6_get_addr)(sd_dhcp6_lease*, const struct in6_addr**),
4259                 int (*lease6_get_fqdn)(sd_dhcp6_lease*, char ***)) {
4260         int r;
4261
4262         bool _space = false;
4263         if (!space)
4264                 space = &_space;
4265
4266         if (lvalue)
4267                 fprintf(f, "%s=", lvalue);
4268         fputstrv(f, addresses, NULL, space);
4269
4270         if (lease && conditional) {
4271                 const struct in_addr *lease_addresses;
4272
4273                 r = sd_dhcp_lease_get_servers(lease, what, &lease_addresses);
4274                 if (r > 0)
4275                         serialize_in_addrs(f, lease_addresses, r, space, in4_addr_is_non_local);
4276         }
4277
4278         if (lease6 && conditional6 && lease6_get_addr) {
4279                 const struct in6_addr *in6_addrs;
4280
4281                 r = lease6_get_addr(lease6, &in6_addrs);
4282                 if (r > 0)
4283                         serialize_in6_addrs(f, in6_addrs, r, space);
4284         }
4285
4286         if (lease6 && conditional6 && lease6_get_fqdn) {
4287                 char **in6_hosts;
4288
4289                 r = lease6_get_fqdn(lease6, &in6_hosts);
4290                 if (r > 0)
4291                         fputstrv(f, in6_hosts, NULL, space);
4292         }
4293
4294         if (lvalue)
4295                 fputc('\n', f);
4296 }
4297
4298 int link_save(Link *link) {
4299         const char *admin_state, *oper_state, *carrier_state, *address_state;
4300         _cleanup_free_ char *temp_path = NULL;
4301         _cleanup_fclose_ FILE *f = NULL;
4302         Route *route;
4303         Address *a;
4304         int r;
4305
4306         assert(link);
4307         assert(link->state_file);
4308         assert(link->lease_file);
4309         assert(link->manager);
4310
4311         if (link->state == LINK_STATE_LINGER) {
4312                 (void) unlink(link->state_file);
4313                 return 0;
4314         }
4315
4316         link_lldp_save(link);
4317
4318         admin_state = link_state_to_string(link->state);
4319         assert(admin_state);
4320
4321         oper_state = link_operstate_to_string(link->operstate);
4322         assert(oper_state);
4323
4324         carrier_state = link_carrier_state_to_string(link->carrier_state);
4325         assert(carrier_state);
4326
4327         address_state = link_address_state_to_string(link->address_state);
4328         assert(address_state);
4329
4330         r = fopen_temporary(link->state_file, &f, &temp_path);
4331         if (r < 0)
4332                 goto fail;
4333
4334         (void) fchmod(fileno(f), 0644);
4335
4336         fprintf(f,
4337                 "# This is private data. Do not parse.\n"
4338                 "ADMIN_STATE=%s\n"
4339                 "OPER_STATE=%s\n"
4340                 "CARRIER_STATE=%s\n"
4341                 "ADDRESS_STATE=%s\n",
4342                 admin_state, oper_state, carrier_state, address_state);
4343
4344         if (link->network) {
4345                 char **dhcp6_domains = NULL, **dhcp_domains = NULL;
4346                 const char *dhcp_domainname = NULL, *p;
4347                 bool space;
4348
4349                 fprintf(f, "REQUIRED_FOR_ONLINE=%s\n",
4350                         yes_no(link->network->required_for_online));
4351
4352                 LinkOperationalStateRange st = link->network->required_operstate_for_online;
4353                 fprintf(f, "REQUIRED_OPER_STATE_FOR_ONLINE=%s%s%s\n",
4354                         strempty(link_operstate_to_string(st.min)),
4355                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? ":" : "",
4356                         st.max != LINK_OPERSTATE_RANGE_DEFAULT.max ? strempty(link_operstate_to_string(st.max)) : "");
4357
4358                 fprintf(f, "NETWORK_FILE=%s\n", link->network->filename);
4359
4360                 /************************************************************/
4361
4362                 fputs("DNS=", f);
4363                 space = false;
4364                 if (link->n_dns != (unsigned) -1)
4365                         link_save_dns(link, f, link->dns, link->n_dns, &space);
4366                 else
4367                         link_save_dns(link, f, link->network->dns, link->network->n_dns, &space);
4368
4369                 serialize_addresses(f, NULL, &space,
4370                                     NULL,
4371                                     link->dhcp_lease,
4372                                     link->network->dhcp_use_dns,
4373                                     SD_DHCP_LEASE_DNS,
4374                                     link->dhcp6_lease,
4375                                     link->network->dhcp6_use_dns,
4376                                     sd_dhcp6_lease_get_dns,
4377                                     NULL);
4378
4379                 /* Make sure to flush out old entries before we use the NDisc data */
4380                 ndisc_vacuum(link);
4381
4382                 if (link->network->ipv6_accept_ra_use_dns && link->ndisc_rdnss) {
4383                         NDiscRDNSS *dd;
4384
4385                         SET_FOREACH(dd, link->ndisc_rdnss)
4386                                 serialize_in6_addrs(f, &dd->address, 1, &space);
4387                 }
4388
4389                 fputc('\n', f);
4390
4391                 /************************************************************/
4392
4393                 serialize_addresses(f, "NTP", NULL,
4394                                     link->ntp ?: link->network->ntp,
4395                                     link->dhcp_lease,
4396                                     link->network->dhcp_use_ntp,
4397                                     SD_DHCP_LEASE_NTP,
4398                                     link->dhcp6_lease,
4399                                     link->network->dhcp6_use_ntp,
4400                                     sd_dhcp6_lease_get_ntp_addrs,
4401                                     sd_dhcp6_lease_get_ntp_fqdn);
4402
4403                 serialize_addresses(f, "SIP", NULL,
4404                                     NULL,
4405                                     link->dhcp_lease,
4406                                     link->network->dhcp_use_sip,
4407                                     SD_DHCP_LEASE_SIP,
4408                                     NULL, false, NULL, NULL);
4409
4410                 /************************************************************/
4411
4412                 if (link->network->dhcp_use_domains != DHCP_USE_DOMAINS_NO) {
4413                         if (link->dhcp_lease) {
4414                                 (void) sd_dhcp_lease_get_domainname(link->dhcp_lease, &dhcp_domainname);
4415                                 (void) sd_dhcp_lease_get_search_domains(link->dhcp_lease, &dhcp_domains);
4416                         }
4417                         if (link->dhcp6_lease)
4418                                 (void) sd_dhcp6_lease_get_domains(link->dhcp6_lease, &dhcp6_domains);
4419                 }
4420
4421                 fputs("DOMAINS=", f);
4422                 space = false;
4423                 ORDERED_SET_FOREACH(p, link->search_domains ?: link->network->search_domains)
4424                         fputs_with_space(f, p, NULL, &space);
4425
4426                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_YES) {
4427                         if (dhcp_domainname)
4428                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4429                         if (dhcp_domains)
4430                                 fputstrv(f, dhcp_domains, NULL, &space);
4431                         if (dhcp6_domains)
4432                                 fputstrv(f, dhcp6_domains, NULL, &space);
4433                 }
4434
4435                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_YES) {
4436                         NDiscDNSSL *dd;
4437
4438                         SET_FOREACH(dd, link->ndisc_dnssl)
4439                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4440                 }
4441
4442                 fputc('\n', f);
4443
4444                 /************************************************************/
4445
4446                 fputs("ROUTE_DOMAINS=", f);
4447                 space = false;
4448                 ORDERED_SET_FOREACH(p, link->route_domains ?: link->network->route_domains)
4449                         fputs_with_space(f, p, NULL, &space);
4450
4451                 if (link->network->dhcp_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4452                         if (dhcp_domainname)
4453                                 fputs_with_space(f, dhcp_domainname, NULL, &space);
4454                         if (dhcp_domains)
4455                                 fputstrv(f, dhcp_domains, NULL, &space);
4456                         if (dhcp6_domains)
4457                                 fputstrv(f, dhcp6_domains, NULL, &space);
4458                 }
4459
4460                 if (link->network->ipv6_accept_ra_use_domains == DHCP_USE_DOMAINS_ROUTE) {
4461                         NDiscDNSSL *dd;
4462
4463                         SET_FOREACH(dd, link->ndisc_dnssl)
4464                                 fputs_with_space(f, NDISC_DNSSL_DOMAIN(dd), NULL, &space);
4465                 }
4466
4467                 fputc('\n', f);
4468
4469                 /************************************************************/
4470
4471                 fprintf(f, "LLMNR=%s\n",
4472                         resolve_support_to_string(link->llmnr >= 0 ? link->llmnr : link->network->llmnr));
4473
4474                 /************************************************************/
4475
4476                 fprintf(f, "MDNS=%s\n",
4477                         resolve_support_to_string(link->mdns >= 0 ? link->mdns : link->network->mdns));
4478
4479                 /************************************************************/
4480
4481                 int dns_default_route =
4482                         link->dns_default_route >= 0 ? link->dns_default_route :
4483                         link->network->dns_default_route;
4484                 if (dns_default_route >= 0)
4485                         fprintf(f, "DNS_DEFAULT_ROUTE=%s\n", yes_no(dns_default_route));
4486
4487                 /************************************************************/
4488
4489                 DnsOverTlsMode dns_over_tls_mode =
4490                         link->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID ? link->dns_over_tls_mode :
4491                         link->network->dns_over_tls_mode;
4492                 if (dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
4493                         fprintf(f, "DNS_OVER_TLS=%s\n", dns_over_tls_mode_to_string(dns_over_tls_mode));
4494
4495                 /************************************************************/
4496
4497                 DnssecMode dnssec_mode =
4498                         link->dnssec_mode != _DNSSEC_MODE_INVALID ? link->dnssec_mode :
4499                         link->network->dnssec_mode;
4500                 if (dnssec_mode != _DNSSEC_MODE_INVALID)
4501                         fprintf(f, "DNSSEC=%s\n", dnssec_mode_to_string(dnssec_mode));
4502
4503                 /************************************************************/
4504
4505                 Set *nta_anchors = link->dnssec_negative_trust_anchors;
4506                 if (set_isempty(nta_anchors))
4507                         nta_anchors = link->network->dnssec_negative_trust_anchors;
4508
4509                 if (!set_isempty(nta_anchors)) {
4510                         const char *n;
4511
4512                         fputs("DNSSEC_NTA=", f);
4513                         space = false;
4514                         SET_FOREACH(n, nta_anchors)
4515                                 fputs_with_space(f, n, NULL, &space);
4516                         fputc('\n', f);
4517                 }
4518
4519                 /************************************************************/
4520
4521                 fputs("ADDRESSES=", f);
4522                 space = false;
4523                 SET_FOREACH(a, link->addresses) {
4524                         _cleanup_free_ char *address_str = NULL;
4525
4526                         r = in_addr_to_string(a->family, &a->in_addr, &address_str);
4527                         if (r < 0)
4528                                 goto fail;
4529
4530                         fprintf(f, "%s%s/%u", space ? " " : "", address_str, a->prefixlen);
4531                         space = true;
4532                 }
4533                 fputc('\n', f);
4534
4535                 /************************************************************/
4536
4537                 fputs("ROUTES=", f);
4538                 space = false;
4539                 SET_FOREACH(route, link->routes) {
4540                         _cleanup_free_ char *route_str = NULL;
4541
4542                         r = in_addr_to_string(route->family, &route->dst, &route_str);
4543                         if (r < 0)
4544                                 goto fail;
4545
4546                         fprintf(f, "%s%s/%hhu/%hhu/%"PRIu32"/%"PRIu32"/"USEC_FMT,
4547                                 space ? " " : "", route_str,
4548                                 route->dst_prefixlen, route->tos, route->priority, route->table, route->lifetime);
4549                         space = true;
4550                 }
4551
4552                 fputc('\n', f);
4553         }
4554
4555         print_link_hashmap(f, "CARRIER_BOUND_TO=", link->bound_to_links);
4556         print_link_hashmap(f, "CARRIER_BOUND_BY=", link->bound_by_links);
4557
4558         if (link->dhcp_lease) {
4559                 r = dhcp_lease_save(link->dhcp_lease, link->lease_file);
4560                 if (r < 0)
4561                         goto fail;
4562
4563                 fprintf(f,
4564                         "DHCP_LEASE=%s\n",
4565                         link->lease_file);
4566         } else
4567                 (void) unlink(link->lease_file);
4568
4569         if (link->ipv4ll) {
4570                 struct in_addr address;
4571
4572                 r = sd_ipv4ll_get_address(link->ipv4ll, &address);
4573                 if (r >= 0) {
4574                         fputs("IPV4LL_ADDRESS=", f);
4575                         serialize_in_addrs(f, &address, 1, false, NULL);
4576                         fputc('\n', f);
4577                 }
4578         }
4579
4580         if (link->dhcp6_client) {
4581                 _cleanup_free_ char *duid = NULL;
4582                 uint32_t iaid;
4583
4584                 r = sd_dhcp6_client_get_iaid(link->dhcp6_client, &iaid);
4585                 if (r >= 0)
4586                         fprintf(f, "DHCP6_CLIENT_IAID=0x%x\n", iaid);
4587
4588                 r = sd_dhcp6_client_duid_as_string(link->dhcp6_client, &duid);
4589                 if (r >= 0)
4590                         fprintf(f, "DHCP6_CLIENT_DUID=%s\n", duid);
4591         }
4592
4593         r = fflush_and_check(f);
4594         if (r < 0)
4595                 goto fail;
4596
4597         if (rename(temp_path, link->state_file) < 0) {
4598                 r = -errno;
4599                 goto fail;
4600         }
4601
4602         return 0;
4603
4604 fail:
4605         (void) unlink(link->state_file);
4606         if (temp_path)
4607                 (void) unlink(temp_path);
4608
4609         return log_link_error_errno(link, r, "Failed to save link data to %s: %m", link->state_file);
4610 }
4611
4612 /* The serialized state in /run is no longer up-to-date. */
4613 void link_dirty(Link *link) {
4614         int r;
4615
4616         assert(link);
4617
4618         /* mark manager dirty as link is dirty */
4619         manager_dirty(link->manager);
4620
4621         r = set_ensure_put(&link->manager->dirty_links, NULL, link);
4622         if (r <= 0)
4623                 /* Ignore allocation errors and don't take another ref if the link was already dirty */
4624                 return;
4625         link_ref(link);
4626 }
4627
4628 /* The serialized state in /run is up-to-date */
4629 void link_clean(Link *link) {
4630         assert(link);
4631         assert(link->manager);
4632
4633         link_unref(set_remove(link->manager->dirty_links, link));
4634 }
4635
4636 int link_save_and_clean(Link *link) {
4637         int r;
4638
4639         r = link_save(link);
4640         if (r < 0)
4641                 return r;
4642
4643         link_clean(link);
4644         return 0;
4645 }
4646
4647 static const char* const link_state_table[_LINK_STATE_MAX] = {
4648         [LINK_STATE_PENDING] = "pending",
4649         [LINK_STATE_INITIALIZED] = "initialized",
4650         [LINK_STATE_CONFIGURING] = "configuring",
4651         [LINK_STATE_CONFIGURED] = "configured",
4652         [LINK_STATE_UNMANAGED] = "unmanaged",
4653         [LINK_STATE_FAILED] = "failed",
4654         [LINK_STATE_LINGER] = "linger",
4655 };
4656
4657 DEFINE_STRING_TABLE_LOOKUP(link_state, LinkState);
4658
4659 int log_link_message_full_errno(Link *link, sd_netlink_message *m, int level, int err, const char *msg) {
4660         const char *err_msg = NULL;
4661
4662         (void) sd_netlink_message_read_string(m, NLMSGERR_ATTR_MSG, &err_msg);
4663         return log_link_full(link, level, err,
4664                              "%s: %s%s%s%m",
4665                              msg,
4666                              strempty(err_msg),
4667                              err_msg && !endswith(err_msg, ".") ? "." : "",
4668                              err_msg ? " " : "");
4669 }