src/network/netdev/netdev.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2013 Tom Gundersen <teg@jklm.no>
   6 ***/
   7
   8 #include <net/if.h>
   9
  10 #include "alloc-util.h"
  11 #include "conf-files.h"
  12 #include "conf-parser.h"
  13 #include "fd-util.h"
  14 #include "list.h"
  15 #include "netlink-util.h"
  16 #include "network-internal.h"
  17 #include "netdev/netdev.h"
  18 #include "networkd-manager.h"
  19 #include "networkd-link.h"
  20 #include "siphash24.h"
  21 #include "stat-util.h"
  22 #include "string-table.h"
  23 #include "string-util.h"
  24
  25 #include "netdev/bridge.h"
  26 #include "netdev/bond.h"
  27 #include "netdev/geneve.h"
  28 #include "netdev/vlan.h"
  29 #include "netdev/macvlan.h"
  30 #include "netdev/ipvlan.h"
  31 #include "netdev/vxlan.h"
  32 #include "netdev/tunnel.h"
  33 #include "netdev/tuntap.h"
  34 #include "netdev/veth.h"
  35 #include "netdev/dummy.h"
  36 #include "netdev/vrf.h"
  37 #include "netdev/vcan.h"
  38 #include "netdev/vxcan.h"
  39 #include "netdev/wireguard.h"
  40 #include "netdev/netdevsim.h"
  41
  42 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  43         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
  44         [NETDEV_KIND_BOND] = &bond_vtable,
  45         [NETDEV_KIND_VLAN] = &vlan_vtable,
  46         [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
  47         [NETDEV_KIND_MACVTAP] = &macvtap_vtable,
  48         [NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
  49         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  50         [NETDEV_KIND_IPIP] = &ipip_vtable,
  51         [NETDEV_KIND_GRE] = &gre_vtable,
  52         [NETDEV_KIND_GRETAP] = &gretap_vtable,
  53         [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
  54         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  55         [NETDEV_KIND_SIT] = &sit_vtable,
  56         [NETDEV_KIND_VTI] = &vti_vtable,
  57         [NETDEV_KIND_VTI6] = &vti6_vtable,
  58         [NETDEV_KIND_VETH] = &veth_vtable,
  59         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  60         [NETDEV_KIND_TUN] = &tun_vtable,
  61         [NETDEV_KIND_TAP] = &tap_vtable,
  62         [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
  63         [NETDEV_KIND_VRF] = &vrf_vtable,
  64         [NETDEV_KIND_VCAN] = &vcan_vtable,
  65         [NETDEV_KIND_GENEVE] = &geneve_vtable,
  66         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
  67         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  68         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  69 };
  70
  71 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  72         [NETDEV_KIND_BRIDGE] = "bridge",
  73         [NETDEV_KIND_BOND] = "bond",
  74         [NETDEV_KIND_VLAN] = "vlan",
  75         [NETDEV_KIND_MACVLAN] = "macvlan",
  76         [NETDEV_KIND_MACVTAP] = "macvtap",
  77         [NETDEV_KIND_IPVLAN] = "ipvlan",
  78         [NETDEV_KIND_VXLAN] = "vxlan",
  79         [NETDEV_KIND_IPIP] = "ipip",
  80         [NETDEV_KIND_GRE] = "gre",
  81         [NETDEV_KIND_GRETAP] = "gretap",
  82         [NETDEV_KIND_IP6GRE] = "ip6gre",
  83         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
  84         [NETDEV_KIND_SIT] = "sit",
  85         [NETDEV_KIND_VETH] = "veth",
  86         [NETDEV_KIND_VTI] = "vti",
  87         [NETDEV_KIND_VTI6] = "vti6",
  88         [NETDEV_KIND_DUMMY] = "dummy",
  89         [NETDEV_KIND_TUN] = "tun",
  90         [NETDEV_KIND_TAP] = "tap",
  91         [NETDEV_KIND_IP6TNL] = "ip6tnl",
  92         [NETDEV_KIND_VRF] = "vrf",
  93         [NETDEV_KIND_VCAN] = "vcan",
  94         [NETDEV_KIND_GENEVE] = "geneve",
  95         [NETDEV_KIND_VXCAN] = "vxcan",
  96         [NETDEV_KIND_WIREGUARD] = "wireguard",
  97         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
  98 };
  99
 100 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 101 DEFINE_CONFIG_PARSE_ENUM(config_parse_netdev_kind, netdev_kind, NetDevKind, "Failed to parse netdev kind");
 102
 103 static void netdev_cancel_callbacks(NetDev *netdev) {
 104         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 105         netdev_join_callback *callback;
 106
 107         if (!netdev || !netdev->manager)
 108                 return;
 109
 110         rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 111
 112         while ((callback = netdev->callbacks)) {
 113                 if (m) {
 114                         assert(callback->link);
 115                         assert(callback->callback);
 116                         assert(netdev->manager);
 117                         assert(netdev->manager->rtnl);
 118
 119                         callback->callback(netdev->manager->rtnl, m, callback->link);
 120                 }
 121
 122                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 123                 link_unref(callback->link);
 124                 free(callback);
 125         }
 126 }
 127
 128 static void netdev_free(NetDev *netdev) {
 129         if (!netdev)
 130                 return;
 131
 132         netdev_cancel_callbacks(netdev);
 133
 134         if (netdev->ifname && netdev->manager)
 135                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 136
 137         free(netdev->filename);
 138
 139         free(netdev->description);
 140         free(netdev->ifname);
 141         free(netdev->mac);
 142
 143         condition_free_list(netdev->match_host);
 144         condition_free_list(netdev->match_virt);
 145         condition_free_list(netdev->match_kernel_cmdline);
 146         condition_free_list(netdev->match_kernel_version);
 147         condition_free_list(netdev->match_arch);
 148
 149         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 150          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 151          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 152          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 153          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 154          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 155          * call. */
 156         if (netdev->state != _NETDEV_STATE_INVALID &&
 157             NETDEV_VTABLE(netdev) &&
 158             NETDEV_VTABLE(netdev)->done)
 159                 NETDEV_VTABLE(netdev)->done(netdev);
 160
 161         free(netdev);
 162 }
 163
 164 NetDev *netdev_unref(NetDev *netdev) {
 165         if (netdev && (-- netdev->n_ref <= 0))
 166                 netdev_free(netdev);
 167
 168         return NULL;
 169 }
 170
 171 NetDev *netdev_ref(NetDev *netdev) {
 172         if (netdev)
 173                 assert_se(++ netdev->n_ref >= 2);
 174
 175         return netdev;
 176 }
 177
 178 void netdev_drop(NetDev *netdev) {
 179         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 180                 return;
 181
 182         netdev->state = NETDEV_STATE_LINGER;
 183
 184         log_netdev_debug(netdev, "netdev removed");
 185
 186         netdev_cancel_callbacks(netdev);
 187
 188         netdev_unref(netdev);
 189
 190         return;
 191 }
 192
 193 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 194         NetDev *netdev;
 195
 196         assert(manager);
 197         assert(name);
 198         assert(ret);
 199
 200         netdev = hashmap_get(manager->netdevs, name);
 201         if (!netdev) {
 202                 *ret = NULL;
 203                 return -ENOENT;
 204         }
 205
 206         *ret = netdev;
 207
 208         return 0;
 209 }
 210
 211 static int netdev_enter_failed(NetDev *netdev) {
 212         netdev->state = NETDEV_STATE_FAILED;
 213
 214         netdev_cancel_callbacks(netdev);
 215
 216         return 0;
 217 }
 218
 219 static int netdev_enslave_ready(NetDev *netdev, Link* link, sd_netlink_message_handler_t callback) {
 220         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 221         int r;
 222
 223         assert(netdev);
 224         assert(netdev->state == NETDEV_STATE_READY);
 225         assert(netdev->manager);
 226         assert(netdev->manager->rtnl);
 227         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 228         assert(link);
 229         assert(callback);
 230
 231         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 232                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 233                 r = link_down(link);
 234                 if (r < 0)
 235                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 236         }
 237
 238         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 239         if (r < 0)
 240                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 241
 242         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 243         if (r < 0)
 244                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 245
 246         r = sd_netlink_call_async(netdev->manager->rtnl, req, callback, link, 0, NULL);
 247         if (r < 0)
 248                 return log_netdev_error(netdev, "Could not send rtnetlink message: %m");
 249
 250         link_ref(link);
 251
 252         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 253
 254         return 0;
 255 }
 256
 257 static int netdev_enter_ready(NetDev *netdev) {
 258         netdev_join_callback *callback, *callback_next;
 259         int r;
 260
 261         assert(netdev);
 262         assert(netdev->ifname);
 263
 264         if (netdev->state != NETDEV_STATE_CREATING)
 265                 return 0;
 266
 267         netdev->state = NETDEV_STATE_READY;
 268
 269         log_netdev_info(netdev, "netdev ready");
 270
 271         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 272                 /* enslave the links that were attempted to be enslaved before the
 273                  * link was ready */
 274                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 275                 if (r < 0)
 276                         return r;
 277
 278                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 279                 link_unref(callback->link);
 280                 free(callback);
 281         }
 282
 283         if (NETDEV_VTABLE(netdev)->post_create)
 284                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 285
 286         return 0;
 287 }
 288
 289 /* callback for netdev's created without a backing Link */
 290 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, void *userdata) {
 291         _cleanup_(netdev_unrefp) NetDev *netdev = userdata;
 292         int r;
 293
 294         assert(netdev->state != _NETDEV_STATE_INVALID);
 295
 296         r = sd_netlink_message_get_errno(m);
 297         if (r == -EEXIST)
 298                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 299         else if (r < 0) {
 300                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 301                 netdev_drop(netdev);
 302
 303                 return 1;
 304         }
 305
 306         log_netdev_debug(netdev, "Created");
 307
 308         return 1;
 309 }
 310
 311 int netdev_enslave(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) {
 312         int r;
 313
 314         assert(netdev);
 315         assert(netdev->manager);
 316         assert(netdev->manager->rtnl);
 317         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 318
 319         if (netdev->state == NETDEV_STATE_READY) {
 320                 r = netdev_enslave_ready(netdev, link, callback);
 321                 if (r < 0)
 322                         return r;
 323         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 324                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 325
 326                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 327                 if (r >= 0)
 328                         callback(netdev->manager->rtnl, m, link);
 329         } else {
 330                 /* the netdev is not yet read, save this request for when it is */
 331                 netdev_join_callback *cb;
 332
 333                 cb = new0(netdev_join_callback, 1);
 334                 if (!cb)
 335                         return log_oom();
 336
 337                 cb->callback = callback;
 338                 cb->link = link;
 339                 link_ref(link);
 340
 341                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 342
 343                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 344         }
 345
 346         return 0;
 347 }
 348
 349 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 350         uint16_t type;
 351         const char *kind;
 352         const char *received_kind;
 353         const char *received_name;
 354         int r, ifindex;
 355
 356         assert(netdev);
 357         assert(message);
 358
 359         r = sd_netlink_message_get_type(message, &type);
 360         if (r < 0)
 361                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 362
 363         if (type != RTM_NEWLINK) {
 364                 log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type.");
 365                 return -EINVAL;
 366         }
 367
 368         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 369         if (r < 0) {
 370                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 371                 netdev_enter_failed(netdev);
 372                 return r;
 373         } else if (ifindex <= 0) {
 374                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 375                 netdev_enter_failed(netdev);
 376                 return -EINVAL;
 377         }
 378
 379         if (netdev->ifindex > 0) {
 380                 if (netdev->ifindex != ifindex) {
 381                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 382                                          ifindex, netdev->ifindex);
 383                         netdev_enter_failed(netdev);
 384                         return -EEXIST;
 385                 } else
 386                         /* ifindex already set to the same for this netdev */
 387                         return 0;
 388         }
 389
 390         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 391         if (r < 0)
 392                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 393
 394         if (!streq(netdev->ifname, received_name)) {
 395                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 396                 netdev_enter_failed(netdev);
 397                 return r;
 398         }
 399
 400         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 401         if (r < 0)
 402                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 403
 404         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 405         if (r < 0)
 406                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 407
 408         r = sd_netlink_message_exit_container(message);
 409         if (r < 0)
 410                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 411
 412         if (netdev->kind == NETDEV_KIND_TAP)
 413                 /* the kernel does not distinguish between tun and tap */
 414                 kind = "tun";
 415         else {
 416                 kind = netdev_kind_to_string(netdev->kind);
 417                 if (!kind) {
 418                         log_netdev_error(netdev, "Could not get kind");
 419                         netdev_enter_failed(netdev);
 420                         return -EINVAL;
 421                 }
 422         }
 423
 424         if (!streq(kind, received_kind)) {
 425                 log_netdev_error(netdev,
 426                                  "Received newlink with wrong KIND %s, "
 427                                  "expected %s", received_kind, kind);
 428                 netdev_enter_failed(netdev);
 429                 return r;
 430         }
 431
 432         netdev->ifindex = ifindex;
 433
 434         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 435
 436         netdev_enter_ready(netdev);
 437
 438         return 0;
 439 }
 440
 441 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 442
 443 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 444         _cleanup_free_ struct ether_addr *mac = NULL;
 445         uint64_t result;
 446         size_t l, sz;
 447         uint8_t *v;
 448         int r;
 449
 450         assert(ifname);
 451         assert(ret);
 452
 453         mac = new0(struct ether_addr, 1);
 454         if (!mac)
 455                 return -ENOMEM;
 456
 457         l = strlen(ifname);
 458         sz = sizeof(sd_id128_t) + l;
 459         v = alloca(sz);
 460
 461         /* fetch some persistent data unique to the machine */
 462         r = sd_id128_get_machine((sd_id128_t*) v);
 463         if (r < 0)
 464                 return r;
 465
 466         /* combine with some data unique (on this machine) to this
 467          * netdev */
 468         memcpy(v + sizeof(sd_id128_t), ifname, l);
 469
 470         /* Let's hash the host machine ID plus the container name. We
 471          * use a fixed, but originally randomly created hash key here. */
 472         result = siphash24(v, sz, HASH_KEY.bytes);
 473
 474         assert_cc(ETH_ALEN <= sizeof(result));
 475         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 476
 477         /* see eth_random_addr in the kernel */
 478         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 479         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 480
 481         *ret = TAKE_PTR(mac);
 482
 483         return 0;
 484 }
 485
 486 static int netdev_create(NetDev *netdev, Link *link,
 487                          sd_netlink_message_handler_t callback) {
 488         int r;
 489
 490         assert(netdev);
 491         assert(!link || callback);
 492
 493         /* create netdev */
 494         if (NETDEV_VTABLE(netdev)->create) {
 495                 assert(!link);
 496
 497                 r = NETDEV_VTABLE(netdev)->create(netdev);
 498                 if (r < 0)
 499                         return r;
 500
 501                 log_netdev_debug(netdev, "Created");
 502         } else {
 503                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 504
 505                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 506                 if (r < 0)
 507                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 508
 509                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 510                 if (r < 0)
 511                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 512
 513                 if (netdev->mac) {
 514                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 515                         if (r < 0)
 516                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 517                 }
 518
 519                 if (netdev->mtu) {
 520                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 521                         if (r < 0)
 522                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 523                 }
 524
 525                 if (link) {
 526                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 527                         if (r < 0)
 528                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 529                 }
 530
 531                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 532                 if (r < 0)
 533                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 534
 535                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 536                 if (r < 0)
 537                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 538
 539                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 540                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 541                         if (r < 0)
 542                                 return r;
 543                 }
 544
 545                 r = sd_netlink_message_close_container(m);
 546                 if (r < 0)
 547                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 548
 549                 r = sd_netlink_message_close_container(m);
 550                 if (r < 0)
 551                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 552
 553                 if (link) {
 554                         r = sd_netlink_call_async(netdev->manager->rtnl, m, callback, link, 0, NULL);
 555                         if (r < 0)
 556                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 557
 558                         link_ref(link);
 559                 } else {
 560                         r = sd_netlink_call_async(netdev->manager->rtnl, m, netdev_create_handler, netdev, 0, NULL);
 561                         if (r < 0)
 562                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 563
 564                         netdev_ref(netdev);
 565                 }
 566
 567                 netdev->state = NETDEV_STATE_CREATING;
 568
 569                 log_netdev_debug(netdev, "Creating");
 570         }
 571
 572         return 0;
 573 }
 574
 575 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 576 int netdev_join(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback) {
 577         int r;
 578
 579         assert(netdev);
 580         assert(netdev->manager);
 581         assert(netdev->manager->rtnl);
 582         assert(NETDEV_VTABLE(netdev));
 583
 584         switch (NETDEV_VTABLE(netdev)->create_type) {
 585         case NETDEV_CREATE_MASTER:
 586                 r = netdev_enslave(netdev, link, callback);
 587                 if (r < 0)
 588                         return r;
 589
 590                 break;
 591         case NETDEV_CREATE_STACKED:
 592                 r = netdev_create(netdev, link, callback);
 593                 if (r < 0)
 594                         return r;
 595
 596                 break;
 597         default:
 598                 assert_not_reached("Can not join independent netdev");
 599         }
 600
 601         return 0;
 602 }
 603
 604 static int netdev_load_one(Manager *manager, const char *filename) {
 605         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 606         _cleanup_fclose_ FILE *file = NULL;
 607         const char *dropin_dirname;
 608         bool independent = false;
 609         int r;
 610
 611         assert(manager);
 612         assert(filename);
 613
 614         file = fopen(filename, "re");
 615         if (!file) {
 616                 if (errno == ENOENT)
 617                         return 0;
 618
 619                 return -errno;
 620         }
 621
 622         if (null_or_empty_fd(fileno(file))) {
 623                 log_debug("Skipping empty file: %s", filename);
 624                 return 0;
 625         }
 626
 627         netdev_raw = new0(NetDev, 1);
 628         if (!netdev_raw)
 629                 return log_oom();
 630
 631         netdev_raw->n_ref = 1;
 632         netdev_raw->kind = _NETDEV_KIND_INVALID;
 633         netdev_raw->state = _NETDEV_STATE_INVALID; /* an invalid state means done() of the implementation won't be called on destruction */
 634
 635         dropin_dirname = strjoina(basename(filename), ".d");
 636         r = config_parse_many(filename, network_dirs, dropin_dirname,
 637                               "Match\0NetDev\0",
 638                               config_item_perf_lookup, network_netdev_gperf_lookup,
 639                               CONFIG_PARSE_WARN|CONFIG_PARSE_RELAXED, netdev_raw);
 640         if (r < 0)
 641                 return r;
 642
 643         /* skip out early if configuration does not match the environment */
 644         if (net_match_config(NULL, NULL, NULL, NULL, NULL,
 645                              netdev_raw->match_host, netdev_raw->match_virt,
 646                              netdev_raw->match_kernel_cmdline, netdev_raw->match_kernel_version,
 647                              netdev_raw->match_arch,
 648                              NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
 649                 return 0;
 650
 651         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 652                 log_warning("NetDev has no Kind configured in %s. Ignoring", filename);
 653                 return 0;
 654         }
 655
 656         if (!netdev_raw->ifname) {
 657                 log_warning("NetDev without Name configured in %s. Ignoring", filename);
 658                 return 0;
 659         }
 660
 661         r = fseek(file, 0, SEEK_SET);
 662         if (r < 0)
 663                 return -errno;
 664
 665         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 666         if (!netdev)
 667                 return log_oom();
 668
 669         netdev->n_ref = 1;
 670         netdev->manager = manager;
 671         netdev->kind = netdev_raw->kind;
 672         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time, so that done() will be called on destruction */
 673
 674         if (NETDEV_VTABLE(netdev)->init)
 675                 NETDEV_VTABLE(netdev)->init(netdev);
 676
 677         r = config_parse(NULL, filename, file,
 678                          NETDEV_VTABLE(netdev)->sections,
 679                          config_item_perf_lookup, network_netdev_gperf_lookup,
 680                          CONFIG_PARSE_WARN, netdev);
 681         if (r < 0)
 682                 return r;
 683
 684         /* verify configuration */
 685         if (NETDEV_VTABLE(netdev)->config_verify) {
 686                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 687                 if (r < 0)
 688                         return 0;
 689         }
 690
 691         netdev->filename = strdup(filename);
 692         if (!netdev->filename)
 693                 return log_oom();
 694
 695         if (!netdev->mac && netdev->kind != NETDEV_KIND_VLAN) {
 696                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 697                 if (r < 0)
 698                         return log_error_errno(r, "Failed to generate predictable MAC address for %s: %m", netdev->ifname);
 699         }
 700
 701         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 702         if (r < 0)
 703                 return r;
 704
 705         LIST_HEAD_INIT(netdev->callbacks);
 706
 707         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 708
 709         switch (NETDEV_VTABLE(netdev)->create_type) {
 710         case NETDEV_CREATE_MASTER:
 711         case NETDEV_CREATE_INDEPENDENT:
 712                 r = netdev_create(netdev, NULL, NULL);
 713                 if (r < 0)
 714                         return r;
 715
 716                 break;
 717         default:
 718                 break;
 719         }
 720
 721         switch (netdev->kind) {
 722         case NETDEV_KIND_IPIP:
 723                 independent = IPIP(netdev)->independent;
 724                 break;
 725         case NETDEV_KIND_GRE:
 726                 independent = GRE(netdev)->independent;
 727                 break;
 728         case NETDEV_KIND_GRETAP:
 729                 independent = GRETAP(netdev)->independent;
 730                 break;
 731         case NETDEV_KIND_IP6GRE:
 732                 independent = IP6GRE(netdev)->independent;
 733                 break;
 734         case NETDEV_KIND_IP6GRETAP:
 735                 independent = IP6GRETAP(netdev)->independent;
 736                 break;
 737         case NETDEV_KIND_SIT:
 738                 independent = SIT(netdev)->independent;
 739                 break;
 740         case NETDEV_KIND_VTI:
 741                 independent = VTI(netdev)->independent;
 742                 break;
 743         case NETDEV_KIND_VTI6:
 744                 independent = VTI6(netdev)->independent;
 745                 break;
 746         case NETDEV_KIND_IP6TNL:
 747                 independent = IP6TNL(netdev)->independent;
 748                 break;
 749         default:
 750                 break;
 751         }
 752
 753         if (independent) {
 754                 r = netdev_create(netdev, NULL, NULL);
 755                 if (r < 0)
 756                         return r;
 757         }
 758
 759         netdev = NULL;
 760
 761         return 0;
 762 }
 763
 764 int netdev_load(Manager *manager) {
 765         _cleanup_strv_free_ char **files = NULL;
 766         NetDev *netdev;
 767         char **f;
 768         int r;
 769
 770         assert(manager);
 771
 772         while ((netdev = hashmap_first(manager->netdevs)))
 773                 netdev_unref(netdev);
 774
 775         r = conf_files_list_strv(&files, ".netdev", NULL, 0, network_dirs);
 776         if (r < 0)
 777                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 778
 779         STRV_FOREACH_BACKWARDS(f, files) {
 780                 r = netdev_load_one(manager, *f);
 781                 if (r < 0)
 782                         return r;
 783         }
 784
 785         return 0;
 786 }