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