src/network/netdev/netdev.c

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