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