src/network/networkd-netdev.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Tom Gundersen <teg@jklm.no>
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <net/if.h>
  23
  24 #include "networkd-netdev.h"
  25 #include "network-internal.h"
  26 #include "path-util.h"
  27 #include "conf-files.h"
  28 #include "conf-parser.h"
  29 #include "list.h"
  30 #include "siphash24.h"
  31
  32 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  33         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
  34         [NETDEV_KIND_BOND] = &bond_vtable,
  35         [NETDEV_KIND_VLAN] = &vlan_vtable,
  36         [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
  37         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  38         [NETDEV_KIND_IPIP] = &ipip_vtable,
  39         [NETDEV_KIND_GRE] = &gre_vtable,
  40         [NETDEV_KIND_SIT] = &sit_vtable,
  41         [NETDEV_KIND_VTI] = &vti_vtable,
  42         [NETDEV_KIND_VETH] = &veth_vtable,
  43         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  44         [NETDEV_KIND_TUN] = &tun_vtable,
  45         [NETDEV_KIND_TAP] = &tap_vtable,
  46 };
  47
  48 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  49         [NETDEV_KIND_BRIDGE] = "bridge",
  50         [NETDEV_KIND_BOND] = "bond",
  51         [NETDEV_KIND_VLAN] = "vlan",
  52         [NETDEV_KIND_MACVLAN] = "macvlan",
  53         [NETDEV_KIND_VXLAN] = "vxlan",
  54         [NETDEV_KIND_IPIP] = "ipip",
  55         [NETDEV_KIND_GRE] = "gre",
  56         [NETDEV_KIND_SIT] = "sit",
  57         [NETDEV_KIND_VETH] = "veth",
  58         [NETDEV_KIND_VTI] = "vti",
  59         [NETDEV_KIND_DUMMY] = "dummy",
  60         [NETDEV_KIND_TUN] = "tun",
  61         [NETDEV_KIND_TAP] = "tap",
  62 };
  63
  64 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
  65 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
  66
  67
  68 static void netdev_cancel_callbacks(NetDev *netdev) {
  69         _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
  70         netdev_join_callback *callback;
  71
  72         if (!netdev)
  73                 return;
  74
  75         rtnl_message_new_synthetic_error(-ENODEV, 0, &m);
  76
  77         while ((callback = netdev->callbacks)) {
  78                 if (m) {
  79                         assert(callback->link);
  80                         assert(callback->callback);
  81                         assert(netdev->manager);
  82                         assert(netdev->manager->rtnl);
  83
  84                         callback->callback(netdev->manager->rtnl, m, link);
  85                 }
  86
  87                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
  88                 free(callback);
  89         }
  90 }
  91
  92 static void netdev_free(NetDev *netdev) {
  93         if (!netdev)
  94                 return;
  95
  96         netdev_cancel_callbacks(netdev);
  97
  98         if (netdev->ifname)
  99                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 100
 101         free(netdev->filename);
 102
 103         free(netdev->description);
 104         free(netdev->ifname);
 105         free(netdev->mac);
 106
 107         condition_free_list(netdev->match_host);
 108         condition_free_list(netdev->match_virt);
 109         condition_free_list(netdev->match_kernel);
 110         condition_free_list(netdev->match_arch);
 111
 112         if (NETDEV_VTABLE(netdev) &&
 113             NETDEV_VTABLE(netdev)->done)
 114                 NETDEV_VTABLE(netdev)->done(netdev);
 115
 116         free(netdev);
 117 }
 118
 119 NetDev *netdev_unref(NetDev *netdev) {
 120         if (netdev && (-- netdev->n_ref <= 0))
 121                 netdev_free(netdev);
 122
 123         return NULL;
 124 }
 125
 126 NetDev *netdev_ref(NetDev *netdev) {
 127         if (netdev)
 128                 assert_se(++ netdev->n_ref >= 2);
 129
 130         return netdev;
 131 }
 132
 133 void netdev_drop(NetDev *netdev) {
 134         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 135                 return;
 136
 137         netdev->state = NETDEV_STATE_LINGER;
 138
 139         log_debug_netdev(netdev, "netdev removed");
 140
 141         netdev_cancel_callbacks(netdev);
 142
 143         netdev_unref(netdev);
 144
 145         return;
 146 }
 147
 148 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 149         NetDev *netdev;
 150
 151         assert(manager);
 152         assert(name);
 153         assert(ret);
 154
 155         netdev = hashmap_get(manager->netdevs, name);
 156         if (!netdev) {
 157                 *ret = NULL;
 158                 return -ENOENT;
 159         }
 160
 161         *ret = netdev;
 162
 163         return 0;
 164 }
 165
 166 static int netdev_enter_failed(NetDev *netdev) {
 167         netdev->state = NETDEV_STATE_FAILED;
 168
 169         return 0;
 170 }
 171
 172 static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_rtnl_message_handler_t callback) {
 173         _cleanup_rtnl_message_unref_ sd_rtnl_message *req = NULL;
 174         int r;
 175
 176         assert(netdev);
 177         assert(netdev->state == NETDEV_STATE_READY);
 178         assert(netdev->manager);
 179         assert(netdev->manager->rtnl);
 180         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND));
 181         assert(link);
 182         assert(callback);
 183
 184         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req,
 185                                      RTM_SETLINK, link->ifindex);
 186         if (r < 0) {
 187                 log_error_netdev(netdev,
 188                                  "Could not allocate RTM_SETLINK message: %s",
 189                                  strerror(-r));
 190                 return r;
 191         }
 192
 193         r = sd_rtnl_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 194         if (r < 0) {
 195                 log_error_netdev(netdev,
 196                                  "Could not append IFLA_MASTER attribute: %s",
 197                                  strerror(-r));
 198                 return r;
 199         }
 200
 201         r = sd_rtnl_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
 202         if (r < 0) {
 203                 log_error_netdev(netdev,
 204                                  "Could not send rtnetlink message: %s",
 205                                  strerror(-r));
 206                 return r;
 207         }
 208
 209         link_ref(link);
 210
 211         log_debug_netdev(netdev, "enslaving link '%s'", link->ifname);
 212
 213         return 0;
 214 }
 215
 216 static int netdev_enter_ready(NetDev *netdev) {
 217         netdev_join_callback *callback, *callback_next;
 218         int r;
 219
 220         assert(netdev);
 221         assert(netdev->ifname);
 222
 223         if (netdev->state != NETDEV_STATE_CREATING)
 224                 return 0;
 225
 226         netdev->state = NETDEV_STATE_READY;
 227
 228         log_info_netdev(netdev, "netdev ready");
 229
 230         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 231                 /* enslave the links that were attempted to be enslaved before the
 232                  * link was ready */
 233                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 234                 if (r < 0)
 235                         return r;
 236
 237                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 238                 link_unref(callback->link);
 239                 free(callback);
 240         }
 241
 242         return 0;
 243 }
 244
 245 /* callback for netdev's created without a backing Link */
 246 static int netdev_create_handler(sd_rtnl *rtnl, sd_rtnl_message *m, void *userdata) {
 247         _cleanup_netdev_unref_ NetDev *netdev = userdata;
 248         int r;
 249
 250         assert(netdev->state != _NETDEV_STATE_INVALID);
 251
 252         r = sd_rtnl_message_get_errno(m);
 253         if (r == -EEXIST)
 254                 log_debug_netdev(netdev, "netdev exists, using existing");
 255         else if (r < 0) {
 256                 log_warning_netdev(netdev, "netdev could not be created: %s", strerror(-r));
 257                 netdev_drop(netdev);
 258
 259                 return 1;
 260         }
 261
 262         log_debug_netdev(netdev, "created");
 263
 264         return 1;
 265 }
 266
 267 int netdev_enslave(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
 268         int r;
 269
 270         assert(netdev);
 271         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND));
 272
 273         if (netdev->state == NETDEV_STATE_READY) {
 274                 r = netdev_enslave_ready(netdev, link, callback);
 275                 if (r < 0)
 276                         return r;
 277         } else {
 278                 /* the netdev is not yet read, save this request for when it is*/
 279                 netdev_join_callback *cb;
 280
 281                 cb = new0(netdev_join_callback, 1);
 282                 if (!cb)
 283                         return log_oom();
 284
 285                 cb->callback = callback;
 286                 cb->link = link;
 287                 link_ref(link);
 288
 289                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 290
 291                 log_debug_netdev(netdev, "will enslave '%s', when reday",
 292                                  link->ifname);
 293         }
 294
 295         return 0;
 296 }
 297
 298 int netdev_set_ifindex(NetDev *netdev, sd_rtnl_message *message) {
 299         uint16_t type;
 300         const char *kind;
 301         const char *received_kind;
 302         const char *received_name;
 303         int r, ifindex;
 304
 305         assert(netdev);
 306         assert(message);
 307
 308         r = sd_rtnl_message_get_type(message, &type);
 309         if (r < 0) {
 310                 log_error_netdev(netdev, "Could not get rtnl message type");
 311                 return r;
 312         }
 313
 314         if (type != RTM_NEWLINK) {
 315                 log_error_netdev(netdev, "Can not set ifindex from unexpected rtnl message type");
 316                 return -EINVAL;
 317         }
 318
 319         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 320         if (r < 0) {
 321                 log_error_netdev(netdev, "Could not get ifindex: %s", strerror(-r));
 322                 netdev_enter_failed(netdev);
 323                 return r;
 324         } else if (ifindex <= 0) {
 325                 log_error_netdev(netdev, "Got invalid ifindex: %d", ifindex);
 326                 netdev_enter_failed(netdev);
 327                 return r;
 328         }
 329
 330         if (netdev->ifindex > 0) {
 331                 if (netdev->ifindex != ifindex) {
 332                         log_error_netdev(netdev, "Could not set ifindex to %d, already set to %d",
 333                                          ifindex, netdev->ifindex);
 334                         netdev_enter_failed(netdev);
 335                         return -EEXIST;
 336                 } else
 337                         /* ifindex already set to the same for this netdev */
 338                         return 0;
 339         }
 340
 341         r = sd_rtnl_message_read_string(message, IFLA_IFNAME, &received_name);
 342         if (r < 0) {
 343                 log_error_netdev(netdev, "Could not get IFNAME");
 344                 return r;
 345         }
 346
 347         if (!streq(netdev->ifname, received_name)) {
 348                 log_error_netdev(netdev, "Received newlink with wrong IFNAME %s",
 349                                  received_name);
 350                 netdev_enter_failed(netdev);
 351                 return r;
 352         }
 353
 354         r = sd_rtnl_message_enter_container(message, IFLA_LINKINFO);
 355         if (r < 0) {
 356                 log_error_netdev(netdev, "Could not get LINKINFO");
 357                 return r;
 358         }
 359
 360         r = sd_rtnl_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 361         if (r < 0) {
 362                 log_error_netdev(netdev, "Could not get KIND");
 363                 return r;
 364         }
 365
 366         r = sd_rtnl_message_exit_container(message);
 367         if (r < 0) {
 368                 log_error_netdev(netdev, "Could not exit container");
 369                 return r;
 370         }
 371
 372         if (netdev->kind == NETDEV_KIND_TAP)
 373                 /* the kernel does not distinguish between tun and tap */
 374                 kind = "tun";
 375         else {
 376                 kind = netdev_kind_to_string(netdev->kind);
 377                 if (!kind) {
 378                         log_error_netdev(netdev, "Could not get kind");
 379                         netdev_enter_failed(netdev);
 380                         return -EINVAL;
 381                 }
 382         }
 383
 384         if (!streq(kind, received_kind)) {
 385                 log_error_netdev(netdev,
 386                                  "Received newlink with wrong KIND %s, "
 387                                  "expected %s", received_kind, kind);
 388                 netdev_enter_failed(netdev);
 389                 return r;
 390         }
 391
 392         netdev->ifindex = ifindex;
 393
 394         log_debug_netdev(netdev, "netdev has index %d", netdev->ifindex);
 395
 396         netdev_enter_ready(netdev);
 397
 398         return 0;
 399 }
 400
 401 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 402
 403 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 404         _cleanup_free_ struct ether_addr *mac = NULL;
 405         uint8_t result[8];
 406         size_t l, sz;
 407         uint8_t *v;
 408         int r;
 409
 410         assert(ifname);
 411         assert(ret);
 412
 413         mac = new0(struct ether_addr, 1);
 414         if (!mac)
 415                 return -ENOMEM;
 416
 417         l = strlen(ifname);
 418         sz = sizeof(sd_id128_t) + l;
 419         v = alloca(sz);
 420
 421         /* fetch some persistent data unique to the machine */
 422         r = sd_id128_get_machine((sd_id128_t*) v);
 423         if (r < 0)
 424                 return r;
 425
 426         /* combine with some data unique (on this machine) to this
 427          * netdev */
 428         memcpy(v + sizeof(sd_id128_t), ifname, l);
 429
 430         /* Let's hash the host machine ID plus the container name. We
 431          * use a fixed, but originally randomly created hash key here. */
 432         siphash24(result, v, sz, HASH_KEY.bytes);
 433
 434         assert_cc(ETH_ALEN <= sizeof(result));
 435         memcpy(mac->ether_addr_octet, result, ETH_ALEN);
 436
 437         /* see eth_random_addr in the kernel */
 438         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 439         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 440
 441         *ret = mac;
 442         mac = NULL;
 443
 444         return 0;
 445 }
 446
 447 static int netdev_create(NetDev *netdev, Link *link) {
 448         int r;
 449
 450         assert(netdev);
 451
 452         /* create netdev */
 453         if (NETDEV_VTABLE(netdev)->create) {
 454                 r = NETDEV_VTABLE(netdev)->create(netdev);
 455                 if (r < 0)
 456                         return r;
 457
 458                 log_debug_netdev(netdev, "created");
 459         } else {
 460                 _cleanup_rtnl_message_unref_ sd_rtnl_message *m = NULL;
 461
 462                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 463                 if (r < 0) {
 464                         log_error_netdev(netdev,
 465                                          "Could not allocate RTM_NEWLINK message: %s",
 466                                          strerror(-r));
 467                         return r;
 468                 }
 469
 470                 r = sd_rtnl_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 471                 if (r < 0) {
 472                         log_error_netdev(netdev,
 473                                          "Could not append IFLA_IFNAME, attribute: %s",
 474                                          strerror(-r));
 475                         return r;
 476                 }
 477
 478                 if (netdev->mac) {
 479                         r = sd_rtnl_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 480                         if (r < 0) {
 481                                 log_error_netdev(netdev,
 482                                                  "Could not append IFLA_ADDRESS attribute: %s",
 483                                                  strerror(-r));
 484                             return r;
 485                         }
 486                 }
 487
 488                 if (netdev->mtu) {
 489                         r = sd_rtnl_message_append_u32(m, IFLA_MTU, netdev->mtu);
 490                         if (r < 0) {
 491                                 log_error_netdev(netdev,
 492                                                  "Could not append IFLA_MTU attribute: %s",
 493                                                  strerror(-r));
 494                                 return r;
 495                         }
 496                 }
 497
 498                 if (link) {
 499                         r = sd_rtnl_message_append_u32(m, IFLA_LINK, link->ifindex);
 500                         if (r < 0) {
 501                                 log_error_netdev(netdev,
 502                                                  "Colud not append IFLA_LINK attribute: %s",
 503                                                  strerror(-r));
 504                                 return r;
 505                         }
 506                 }
 507
 508                 r = sd_rtnl_message_open_container(m, IFLA_LINKINFO);
 509                 if (r < 0) {
 510                         log_error_netdev(netdev,
 511                                          "Could not append IFLA_LINKINFO attribute: %s",
 512                                          strerror(-r));
 513                         return r;
 514                 }
 515
 516                 r = sd_rtnl_message_open_container_union(m, IFLA_INFO_DATA,
 517                                                          netdev_kind_to_string(netdev->kind));
 518                 if (r < 0) {
 519                         log_error_netdev(netdev,
 520                                          "Could not append IFLA_INFO_DATA attribute: %s",
 521                                          strerror(-r));
 522                         return r;
 523                 }
 524
 525                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 526                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 527                         if (r < 0)
 528                                 return r;
 529                 }
 530
 531                 r = sd_rtnl_message_close_container(m);
 532                 if (r < 0) {
 533                         log_error_netdev(netdev,
 534                                          "Could not append IFLA_LINKINFO attribute: %s",
 535                                          strerror(-r));
 536                         return r;
 537                 }
 538
 539                 r = sd_rtnl_message_close_container(m);
 540                 if (r < 0) {
 541                         log_error_netdev(netdev,
 542                                          "Could not append IFLA_LINKINFO attribute: %s",
 543                                          strerror(-r));
 544                         return r;
 545                 }
 546
 547
 548                 r = sd_rtnl_call_async(netdev->manager->rtnl, m, netdev_create_handler, netdev, 0, NULL);
 549                 if (r < 0) {
 550                         log_error_netdev(netdev,
 551                                          "Could not send rtnetlink message: %s", strerror(-r));
 552                         return r;
 553                 }
 554
 555                 netdev_ref(netdev);
 556
 557                 netdev->state = NETDEV_STATE_CREATING;
 558
 559                 log_debug_netdev(netdev, "creating");
 560         }
 561
 562         return 0;
 563 }
 564
 565 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 566 int netdev_join(NetDev *netdev, Link *link, sd_rtnl_message_handler_t callback) {
 567         int r;
 568
 569         assert(netdev);
 570         assert(netdev->manager);
 571         assert(netdev->manager->rtnl);
 572         assert(NETDEV_VTABLE(netdev));
 573
 574         switch (NETDEV_VTABLE(netdev)->create_type) {
 575         case NETDEV_CREATE_MASTER:
 576                 r = netdev_enslave(netdev, link, callback);
 577                 if (r < 0)
 578                         return r;
 579
 580                 break;
 581         case NETDEV_CREATE_STACKED:
 582                 r = netdev_create(netdev, link);
 583                 if (r < 0)
 584                         return r;
 585
 586                 break;
 587         default:
 588                 assert_not_reached("Can not join independent netdev");
 589         }
 590
 591         return 0;
 592 }
 593
 594 static int netdev_load_one(Manager *manager, const char *filename) {
 595         _cleanup_netdev_unref_ NetDev *netdev = NULL;
 596         _cleanup_free_ NetDev *netdev_raw = NULL;
 597         _cleanup_fclose_ FILE *file = NULL;
 598         int r;
 599
 600         assert(manager);
 601         assert(filename);
 602
 603         file = fopen(filename, "re");
 604         if (!file) {
 605                 if (errno == ENOENT)
 606                         return 0;
 607                 else
 608                         return -errno;
 609         }
 610
 611         if (null_or_empty_fd(fileno(file))) {
 612                 log_debug("Skipping empty file: %s", filename);
 613                 return 0;
 614         }
 615
 616         netdev_raw = new0(NetDev, 1);
 617         if (!netdev_raw)
 618                 return log_oom();
 619
 620         netdev_raw->kind = _NETDEV_KIND_INVALID;
 621
 622         r = config_parse(NULL, filename, file,
 623                          "Match\0NetDev\0",
 624                          config_item_perf_lookup, network_netdev_gperf_lookup,
 625                          true, false, true, netdev_raw);
 626         if (r < 0)
 627                 return r;
 628
 629         r = fseek(file, 0, SEEK_SET);
 630         if (r < 0)
 631                 return -errno;
 632
 633         /* skip out early if configuration does not match the environment */
 634         if (net_match_config(NULL, NULL, NULL, NULL, NULL,
 635                              netdev_raw->match_host, netdev_raw->match_virt,
 636                              netdev_raw->match_kernel, netdev_raw->match_arch,
 637                              NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
 638                 return 0;
 639
 640         if (!NETDEV_VTABLE(netdev_raw)) {
 641                 log_warning("NetDev with invalid Kind configured in %s. Ignoring", filename);
 642                 return 0;
 643         }
 644
 645         if (!netdev_raw->ifname) {
 646                 log_warning("NetDev without Name configured in %s. Ignoring", filename);
 647                 return 0;
 648         }
 649
 650         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 651         if (!netdev)
 652                 return log_oom();
 653
 654         netdev->n_ref = 1;
 655         netdev->manager = manager;
 656         netdev->state = _NETDEV_STATE_INVALID;
 657         netdev->kind = netdev_raw->kind;
 658         netdev->ifname = netdev_raw->ifname;
 659
 660         if (NETDEV_VTABLE(netdev)->init)
 661                 NETDEV_VTABLE(netdev)->init(netdev);
 662
 663         r = config_parse(NULL, filename, file,
 664                          NETDEV_VTABLE(netdev)->sections,
 665                          config_item_perf_lookup, network_netdev_gperf_lookup,
 666                          false, false, false, netdev);
 667         if (r < 0)
 668                 return r;
 669
 670         /* verify configuration */
 671         if (NETDEV_VTABLE(netdev)->config_verify) {
 672                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 673                 if (r < 0)
 674                         return 0;
 675         }
 676
 677         netdev->filename = strdup(filename);
 678         if (!netdev->filename)
 679                 return log_oom();
 680
 681         if (!netdev->mac) {
 682                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 683                 if (r < 0) {
 684                         log_error("Failed to generate predictable MAC address for %s",
 685                                   netdev->ifname);
 686                         return r;
 687                 }
 688         }
 689
 690         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 691         if (r < 0)
 692                 return r;
 693
 694         LIST_HEAD_INIT(netdev->callbacks);
 695
 696         log_debug_netdev(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 697
 698         switch (NETDEV_VTABLE(netdev)->create_type) {
 699         case NETDEV_CREATE_MASTER:
 700         case NETDEV_CREATE_INDEPENDENT:
 701                 r = netdev_create(netdev, NULL);
 702                 if (r < 0)
 703                         return r;
 704
 705                 break;
 706         default:
 707                 break;
 708         }
 709
 710         netdev = NULL;
 711
 712         return 0;
 713 }
 714
 715 int netdev_load(Manager *manager) {
 716         NetDev *netdev;
 717         char **files, **f;
 718         int r;
 719
 720         assert(manager);
 721
 722         while ((netdev = hashmap_first(manager->netdevs)))
 723                 netdev_unref(netdev);
 724
 725         r = conf_files_list_strv(&files, ".netdev", NULL, network_dirs);
 726         if (r < 0) {
 727                 log_error("Failed to enumerate netdev files: %s", strerror(-r));
 728                 return r;
 729         }
 730
 731         STRV_FOREACH_BACKWARDS(f, files) {
 732                 r = netdev_load_one(manager, *f);
 733                 if (r < 0)
 734                         return r;
 735         }
 736
 737         strv_free(files);
 738
 739         return 0;
 740 }