src/network/netdev/netdev.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   Copyright © 2013 Tom Gundersen <teg@jklm.no>
   4 ***/
   5
   6 #include <net/if.h>
   7
   8 #include "alloc-util.h"
   9 #include "conf-files.h"
  10 #include "conf-parser.h"
  11 #include "fd-util.h"
  12 #include "list.h"
  13 #include "netlink-util.h"
  14 #include "network-internal.h"
  15 #include "netdev/netdev.h"
  16 #include "networkd-manager.h"
  17 #include "networkd-link.h"
  18 #include "siphash24.h"
  19 #include "stat-util.h"
  20 #include "string-table.h"
  21 #include "string-util.h"
  22
  23 #include "netdev/bridge.h"
  24 #include "netdev/bond.h"
  25 #include "netdev/geneve.h"
  26 #include "netdev/vlan.h"
  27 #include "netdev/macvlan.h"
  28 #include "netdev/ipvlan.h"
  29 #include "netdev/vxlan.h"
  30 #include "netdev/tunnel.h"
  31 #include "netdev/tuntap.h"
  32 #include "netdev/veth.h"
  33 #include "netdev/dummy.h"
  34 #include "netdev/vrf.h"
  35 #include "netdev/vcan.h"
  36 #include "netdev/vxcan.h"
  37 #include "netdev/wireguard.h"
  38 #include "netdev/netdevsim.h"
  39
  40 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  41         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
  42         [NETDEV_KIND_BOND] = &bond_vtable,
  43         [NETDEV_KIND_VLAN] = &vlan_vtable,
  44         [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
  45         [NETDEV_KIND_MACVTAP] = &macvtap_vtable,
  46         [NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
  47         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  48         [NETDEV_KIND_IPIP] = &ipip_vtable,
  49         [NETDEV_KIND_GRE] = &gre_vtable,
  50         [NETDEV_KIND_GRETAP] = &gretap_vtable,
  51         [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
  52         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  53         [NETDEV_KIND_SIT] = &sit_vtable,
  54         [NETDEV_KIND_VTI] = &vti_vtable,
  55         [NETDEV_KIND_VTI6] = &vti6_vtable,
  56         [NETDEV_KIND_VETH] = &veth_vtable,
  57         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  58         [NETDEV_KIND_TUN] = &tun_vtable,
  59         [NETDEV_KIND_TAP] = &tap_vtable,
  60         [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
  61         [NETDEV_KIND_VRF] = &vrf_vtable,
  62         [NETDEV_KIND_VCAN] = &vcan_vtable,
  63         [NETDEV_KIND_GENEVE] = &geneve_vtable,
  64         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
  65         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  66         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  67 };
  68
  69 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  70         [NETDEV_KIND_BRIDGE] = "bridge",
  71         [NETDEV_KIND_BOND] = "bond",
  72         [NETDEV_KIND_VLAN] = "vlan",
  73         [NETDEV_KIND_MACVLAN] = "macvlan",
  74         [NETDEV_KIND_MACVTAP] = "macvtap",
  75         [NETDEV_KIND_IPVLAN] = "ipvlan",
  76         [NETDEV_KIND_VXLAN] = "vxlan",
  77         [NETDEV_KIND_IPIP] = "ipip",
  78         [NETDEV_KIND_GRE] = "gre",
  79         [NETDEV_KIND_GRETAP] = "gretap",
  80         [NETDEV_KIND_IP6GRE] = "ip6gre",
  81         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
  82         [NETDEV_KIND_SIT] = "sit",
  83         [NETDEV_KIND_VETH] = "veth",
  84         [NETDEV_KIND_VTI] = "vti",
  85         [NETDEV_KIND_VTI6] = "vti6",
  86         [NETDEV_KIND_DUMMY] = "dummy",
  87         [NETDEV_KIND_TUN] = "tun",
  88         [NETDEV_KIND_TAP] = "tap",
  89         [NETDEV_KIND_IP6TNL] = "ip6tnl",
  90         [NETDEV_KIND_VRF] = "vrf",
  91         [NETDEV_KIND_VCAN] = "vcan",
  92         [NETDEV_KIND_GENEVE] = "geneve",
  93         [NETDEV_KIND_VXCAN] = "vxcan",
  94         [NETDEV_KIND_WIREGUARD] = "wireguard",
  95         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
  96 };
  97
  98 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
  99 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
 100
 101 static void netdev_cancel_callbacks(NetDev *netdev) {
 102         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 103         netdev_join_callback *callback;
 104
 105         if (!netdev || !netdev->manager)
 106                 return;
 107
 108         rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 109
 110         while ((callback = netdev->callbacks)) {
 111                 if (m) {
 112                         assert(callback->link);
 113                         assert(callback->callback);
 114                         assert(netdev->manager);
 115                         assert(netdev->manager->rtnl);
 116
 117                         callback->callback(netdev->manager->rtnl, m, callback->link);
 118                 }
 119
 120                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 121                 link_unref(callback->link);
 122                 free(callback);
 123         }
 124 }
 125
 126 static void netdev_free(NetDev *netdev) {
 127         if (!netdev)
 128                 return;
 129
 130         netdev_cancel_callbacks(netdev);
 131
 132         if (netdev->ifname && netdev->manager)
 133                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 134
 135         free(netdev->filename);
 136
 137         free(netdev->description);
 138         free(netdev->ifname);
 139         free(netdev->mac);
 140
 141         condition_free_list(netdev->match_host);
 142         condition_free_list(netdev->match_virt);
 143         condition_free_list(netdev->match_kernel_cmdline);
 144         condition_free_list(netdev->match_kernel_version);
 145         condition_free_list(netdev->match_arch);
 146
 147         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 148          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 149          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 150          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 151          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 152          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 153          * call. */
 154         if (netdev->state != _NETDEV_STATE_INVALID &&
 155             NETDEV_VTABLE(netdev) &&
 156             NETDEV_VTABLE(netdev)->done)
 157                 NETDEV_VTABLE(netdev)->done(netdev);
 158
 159         free(netdev);
 160 }
 161
 162 NetDev *netdev_unref(NetDev *netdev) {
 163         if (netdev && (-- netdev->n_ref <= 0))
 164                 netdev_free(netdev);
 165
 166         return NULL;
 167 }
 168
 169 NetDev *netdev_ref(NetDev *netdev) {
 170         if (netdev)
 171                 assert_se(++ netdev->n_ref >= 2);
 172
 173         return netdev;
 174 }
 175
 176 void netdev_drop(NetDev *netdev) {
 177         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 178                 return;
 179
 180         netdev->state = NETDEV_STATE_LINGER;
 181
 182         log_netdev_debug(netdev, "netdev removed");
 183
 184         netdev_cancel_callbacks(netdev);
 185
 186         netdev_unref(netdev);
 187
 188         return;
 189 }
 190
 191 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 192         NetDev *netdev;
 193
 194         assert(manager);
 195         assert(name);
 196         assert(ret);
 197
 198         netdev = hashmap_get(manager->netdevs, name);
 199         if (!netdev) {
 200                 *ret = NULL;
 201                 return -ENOENT;
 202         }
 203
 204         *ret = netdev;
 205
 206         return 0;
 207 }
 208
 209 static int netdev_enter_failed(NetDev *netdev) {
 210         netdev->state = NETDEV_STATE_FAILED;
 211
 212         netdev_cancel_callbacks(netdev);
 213
 214         return 0;
 215 }
 216
 217 static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_netlink_message_handler_t callback) {
 218         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 219         int r;
 220
 221         assert(netdev);
 222         assert(netdev->state == NETDEV_STATE_READY);
 223         assert(netdev->manager);
 224         assert(netdev->manager->rtnl);
 225         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 226         assert(link);
 227         assert(callback);
 228
 229         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 230                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 231                 r = link_down(link);
 232                 if (r < 0)
 233                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 234         }
 235
 236         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 237         if (r < 0)
 238                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 239
 240         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 241         if (r < 0)
 242                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 243
 244         r = sd_netlink_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
 245         if (r < 0)
 246                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 247
 248         link_ref(link);
 249
 250         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 251
 252         return 0;
 253 }
 254
 255 static int netdev_enter_ready(NetDev *netdev) {
 256         netdev_join_callback *callback, *callback_next;
 257         int r;
 258
 259         assert(netdev);
 260         assert(netdev->ifname);
 261
 262         if (netdev->state != NETDEV_STATE_CREATING)
 263                 return 0;
 264
 265         netdev->state = NETDEV_STATE_READY;
 266
 267         log_netdev_info(netdev, "netdev ready");
 268
 269         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 270                 /* enslave the links that were attempted to be enslaved before the
 271                  * link was ready */
 272                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 273                 if (r < 0)
 274                         return r;
 275
 276                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 277                 link_unref(callback->link);
 278                 free(callback);
 279         }
 280
 281         if (NETDEV_VTABLE(netdev)->post_create)
 282                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 283
 284         return 0;
 285 }
 286
 287 /* callback for netdev's created without a backing Link */
 288 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
 289         _cleanup_(netdev_unrefp) NetDev *netdev = userdata;
 290         int r;
 291
 292         assert(netdev->state != _NETDEV_STATE_INVALID);
 293
 294         r = sd_netlink_message_get_errno(m);
 295         if (r == -EEXIST)
 296                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 297         else if (r < 0) {
 298                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 299                 netdev_drop(netdev);
 300
 301                 return 1;
 302         }
 303
 304         log_netdev_debug(netdev, "Created");
 305
 306         return 1;
 307 }
 308
 309 int netdev_enslave(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) {
 310         int r;
 311
 312         assert(netdev);
 313         assert(netdev->manager);
 314         assert(netdev->manager->rtnl);
 315         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 316
 317         if (netdev->state == NETDEV_STATE_READY) {
 318                 r = netdev_enslave_ready(netdev, link, callback);
 319                 if (r < 0)
 320                         return r;
 321         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 322                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 323
 324                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 325                 if (r >= 0)
 326                         callback(netdev->manager->rtnl, m, link);
 327         } else {
 328                 /* the netdev is not yet read, save this request for when it is */
 329                 netdev_join_callback *cb;
 330
 331                 cb = new0(netdev_join_callback, 1);
 332                 if (!cb)
 333                         return log_oom();
 334
 335                 cb->callback = callback;
 336                 cb->link = link;
 337                 link_ref(link);
 338
 339                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 340
 341                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 342         }
 343
 344         return 0;
 345 }
 346
 347 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 348         uint16_t type;
 349         const char *kind;
 350         const char *received_kind;
 351         const char *received_name;
 352         int r, ifindex;
 353
 354         assert(netdev);
 355         assert(message);
 356
 357         r = sd_netlink_message_get_type(message, &type);
 358         if (r < 0)
 359                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 360
 361         if (type != RTM_NEWLINK) {
 362                 log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type.");
 363                 return -EINVAL;
 364         }
 365
 366         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 367         if (r < 0) {
 368                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 369                 netdev_enter_failed(netdev);
 370                 return r;
 371         } else if (ifindex <= 0) {
 372                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 373                 netdev_enter_failed(netdev);
 374                 return -EINVAL;
 375         }
 376
 377         if (netdev->ifindex > 0) {
 378                 if (netdev->ifindex != ifindex) {
 379                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 380                                          ifindex, netdev->ifindex);
 381                         netdev_enter_failed(netdev);
 382                         return -EEXIST;
 383                 } else
 384                         /* ifindex already set to the same for this netdev */
 385                         return 0;
 386         }
 387
 388         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 389         if (r < 0)
 390                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 391
 392         if (!streq(netdev->ifname, received_name)) {
 393                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 394                 netdev_enter_failed(netdev);
 395                 return r;
 396         }
 397
 398         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 399         if (r < 0)
 400                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 401
 402         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 403         if (r < 0)
 404                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 405
 406         r = sd_netlink_message_exit_container(message);
 407         if (r < 0)
 408                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 409
 410         if (netdev->kind == NETDEV_KIND_TAP)
 411                 /* the kernel does not distinguish between tun and tap */
 412                 kind = "tun";
 413         else {
 414                 kind = netdev_kind_to_string(netdev->kind);
 415                 if (!kind) {
 416                         log_netdev_error(netdev, "Could not get kind");
 417                         netdev_enter_failed(netdev);
 418                         return -EINVAL;
 419                 }
 420         }
 421
 422         if (!streq(kind, received_kind)) {
 423                 log_netdev_error(netdev,
 424                                  "Received newlink with wrong KIND %s, "
 425                                  "expected %s", received_kind, kind);
 426                 netdev_enter_failed(netdev);
 427                 return r;
 428         }
 429
 430         netdev->ifindex = ifindex;
 431
 432         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 433
 434         netdev_enter_ready(netdev);
 435
 436         return 0;
 437 }
 438
 439 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 440
 441 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 442         _cleanup_free_ struct ether_addr *mac = NULL;
 443         uint64_t result;
 444         size_t l, sz;
 445         uint8_t *v;
 446         int r;
 447
 448         assert(ifname);
 449         assert(ret);
 450
 451         mac = new0(struct ether_addr, 1);
 452         if (!mac)
 453                 return -ENOMEM;
 454
 455         l = strlen(ifname);
 456         sz = sizeof(sd_id128_t) + l;
 457         v = alloca(sz);
 458
 459         /* fetch some persistent data unique to the machine */
 460         r = sd_id128_get_machine((sd_id128_t*) v);
 461         if (r < 0)
 462                 return r;
 463
 464         /* combine with some data unique (on this machine) to this
 465          * netdev */
 466         memcpy(v + sizeof(sd_id128_t), ifname, l);
 467
 468         /* Let's hash the host machine ID plus the container name. We
 469          * use a fixed, but originally randomly created hash key here. */
 470         result = siphash24(v, sz, HASH_KEY.bytes);
 471
 472         assert_cc(ETH_ALEN <= sizeof(result));
 473         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 474
 475         /* see eth_random_addr in the kernel */
 476         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 477         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 478
 479         *ret = TAKE_PTR(mac);
 480
 481         return 0;
 482 }
 483
 484 static int netdev_create(NetDev *netdev, Link *link,
 485                          sd_netlink_message_handler_t callback) {
 486         int r;
 487
 488         assert(netdev);
 489         assert(!link || callback);
 490
 491         /* create netdev */
 492         if (NETDEV_VTABLE(netdev)->create) {
 493                 assert(!link);
 494
 495                 r = NETDEV_VTABLE(netdev)->create(netdev);
 496                 if (r < 0)
 497                         return r;
 498
 499                 log_netdev_debug(netdev, "Created");
 500         } else {
 501                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 502
 503                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 504                 if (r < 0)
 505                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 506
 507                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 508                 if (r < 0)
 509                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 510
 511                 if (netdev->mac) {
 512                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 513                         if (r < 0)
 514                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 515                 }
 516
 517                 if (netdev->mtu) {
 518                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 519                         if (r < 0)
 520                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 521                 }
 522
 523                 if (link) {
 524                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 525                         if (r < 0)
 526                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 527                 }
 528
 529                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 530                 if (r < 0)
 531                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 532
 533                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 534                 if (r < 0)
 535                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 536
 537                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 538                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 539                         if (r < 0)
 540                                 return r;
 541                 }
 542
 543                 r = sd_netlink_message_close_container(m);
 544                 if (r < 0)
 545                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 546
 547                 r = sd_netlink_message_close_container(m);
 548                 if (r < 0)
 549                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 550
 551                 if (link) {
 552                         r = sd_netlink_call_async(netdev->manager->rtnl, m, callback, link, 0, NULL);
 553                         if (r < 0)
 554                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 555
 556                         link_ref(link);
 557                 } else {
 558                         r = sd_netlink_call_async(netdev->manager->rtnl, m, netdev_create_handler, netdev, 0, NULL);
 559                         if (r < 0)
 560                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 561
 562                         netdev_ref(netdev);
 563                 }
 564
 565                 netdev->state = NETDEV_STATE_CREATING;
 566
 567                 log_netdev_debug(netdev, "Creating");
 568         }
 569
 570         return 0;
 571 }
 572
 573 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 574 int netdev_join(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) {
 575         int r;
 576
 577         assert(netdev);
 578         assert(netdev->manager);
 579         assert(netdev->manager->rtnl);
 580         assert(NETDEV_VTABLE(netdev));
 581
 582         switch (NETDEV_VTABLE(netdev)->create_type) {
 583         case NETDEV_CREATE_MASTER:
 584                 r = netdev_enslave(netdev, link, callback);
 585                 if (r < 0)
 586                         return r;
 587
 588                 break;
 589         case NETDEV_CREATE_STACKED:
 590                 r = netdev_create(netdev, link, callback);
 591                 if (r < 0)
 592                         return r;
 593
 594                 break;
 595         default:
 596                 assert_not_reached("Can not join independent netdev");
 597         }
 598
 599         return 0;
 600 }
 601
 602 static int netdev_load_one(Manager *manager, const char *filename) {
 603         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 604         _cleanup_fclose_ FILE *file = NULL;
 605         const char *dropin_dirname;
 606         bool independent = false;
 607         int r;
 608
 609         assert(manager);
 610         assert(filename);
 611
 612         file = fopen(filename, "re");
 613         if (!file) {
 614                 if (errno == ENOENT)
 615                         return 0;
 616
 617                 return -errno;
 618         }
 619
 620         if (null_or_empty_fd(fileno(file))) {
 621                 log_debug("Skipping empty file: %s", filename);
 622                 return 0;
 623         }
 624
 625         netdev_raw = new0(NetDev, 1);
 626         if (!netdev_raw)
 627                 return log_oom();
 628
 629         netdev_raw->n_ref = 1;
 630         netdev_raw->kind = _NETDEV_KIND_INVALID;
 631         netdev_raw->state = _NETDEV_STATE_INVALID; /* an invalid state means done() of the implementation won't be called on destruction */
 632
 633         dropin_dirname = strjoina(basename(filename), ".d");
 634         r = config_parse_many(filename, network_dirs, dropin_dirname,
 635                               "Match\0NetDev\0",
 636                               config_item_perf_lookup, network_netdev_gperf_lookup,
 637                               CONFIG_PARSE_WARN|CONFIG_PARSE_RELAXED, netdev_raw);
 638         if (r < 0)
 639                 return r;
 640
 641         /* skip out early if configuration does not match the environment */
 642         if (net_match_config(NULL, NULL, NULL, NULL, NULL,
 643                              netdev_raw->match_host, netdev_raw->match_virt,
 644                              netdev_raw->match_kernel_cmdline, netdev_raw->match_kernel_version,
 645                              netdev_raw->match_arch,
 646                              NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
 647                 return 0;
 648
 649         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 650                 log_warning("NetDev has no Kind configured in %s. Ignoring", filename);
 651                 return 0;
 652         }
 653
 654         if (!netdev_raw->ifname) {
 655                 log_warning("NetDev without Name configured in %s. Ignoring", filename);
 656                 return 0;
 657         }
 658
 659         r = fseek(file, 0, SEEK_SET);
 660         if (r < 0)
 661                 return -errno;
 662
 663         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 664         if (!netdev)
 665                 return log_oom();
 666
 667         netdev->n_ref = 1;
 668         netdev->manager = manager;
 669         netdev->kind = netdev_raw->kind;
 670         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time, so that done() will be called on destruction */
 671
 672         if (NETDEV_VTABLE(netdev)->init)
 673                 NETDEV_VTABLE(netdev)->init(netdev);
 674
 675         r = config_parse(NULL, filename, file,
 676                          NETDEV_VTABLE(netdev)->sections,
 677                          config_item_perf_lookup, network_netdev_gperf_lookup,
 678                          CONFIG_PARSE_WARN, netdev);
 679         if (r < 0)
 680                 return r;
 681
 682         /* verify configuration */
 683         if (NETDEV_VTABLE(netdev)->config_verify) {
 684                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 685                 if (r < 0)
 686                         return 0;
 687         }
 688
 689         netdev->filename = strdup(filename);
 690         if (!netdev->filename)
 691                 return log_oom();
 692
 693         if (!netdev->mac && netdev->kind != NETDEV_KIND_VLAN) {
 694                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 695                 if (r < 0)
 696                         return log_error_errno(r, "Failed to generate predictable MAC address for %s: %m", netdev->ifname);
 697         }
 698
 699         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 700         if (r < 0)
 701                 return r;
 702
 703         LIST_HEAD_INIT(netdev->callbacks);
 704
 705         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 706
 707         switch (NETDEV_VTABLE(netdev)->create_type) {
 708         case NETDEV_CREATE_MASTER:
 709         case NETDEV_CREATE_INDEPENDENT:
 710                 r = netdev_create(netdev, NULL, NULL);
 711                 if (r < 0)
 712                         return r;
 713
 714                 break;
 715         default:
 716                 break;
 717         }
 718
 719         switch (netdev->kind) {
 720         case NETDEV_KIND_IPIP:
 721                 independent = IPIP(netdev)->independent;
 722                 break;
 723         case NETDEV_KIND_GRE:
 724                 independent = GRE(netdev)->independent;
 725                 break;
 726         case NETDEV_KIND_GRETAP:
 727                 independent = GRETAP(netdev)->independent;
 728                 break;
 729         case NETDEV_KIND_IP6GRE:
 730                 independent = IP6GRE(netdev)->independent;
 731                 break;
 732         case NETDEV_KIND_IP6GRETAP:
 733                 independent = IP6GRETAP(netdev)->independent;
 734                 break;
 735         case NETDEV_KIND_SIT:
 736                 independent = SIT(netdev)->independent;
 737                 break;
 738         case NETDEV_KIND_VTI:
 739                 independent = VTI(netdev)->independent;
 740                 break;
 741         case NETDEV_KIND_VTI6:
 742                 independent = VTI6(netdev)->independent;
 743                 break;
 744         case NETDEV_KIND_IP6TNL:
 745                 independent = IP6TNL(netdev)->independent;
 746                 break;
 747         default:
 748                 break;
 749         }
 750
 751         if (independent) {
 752                 r = netdev_create(netdev, NULL, NULL);
 753                 if (r < 0)
 754                         return r;
 755         }
 756
 757         netdev = NULL;
 758
 759         return 0;
 760 }
 761
 762 int netdev_load(Manager *manager) {
 763         _cleanup_strv_free_ char **files = NULL;
 764         NetDev *netdev;
 765         char **f;
 766         int r;
 767
 768         assert(manager);
 769
 770         while ((netdev = hashmap_first(manager->netdevs)))
 771                 netdev_unref(netdev);
 772
 773         r = conf_files_list_strv(&files, ".netdev", NULL, 0, network_dirs);
 774         if (r < 0)
 775                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 776
 777         STRV_FOREACH_BACKWARDS(f, files) {
 778                 r = netdev_load_one(manager, *f);
 779                 if (r < 0)
 780                         return r;
 781         }
 782
 783         return 0;
 784 }