src/network/netdev/netdev.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <net/if.h>
   4
   5 #include "alloc-util.h"
   6 #include "conf-files.h"
   7 #include "conf-parser.h"
   8 #include "fd-util.h"
   9 #include "list.h"
  10 #include "netdev/bond.h"
  11 #include "netdev/bridge.h"
  12 #include "netdev/dummy.h"
  13 #include "netdev/fou-tunnel.h"
  14 #include "netdev/geneve.h"
  15 #include "netdev/ipvlan.h"
  16 #include "netdev/l2tp-tunnel.h"
  17 #include "netdev/macvlan.h"
  18 #include "netdev/netdev.h"
  19 #include "netdev/netdevsim.h"
  20 #include "netdev/tunnel.h"
  21 #include "netdev/tuntap.h"
  22 #include "netdev/vcan.h"
  23 #include "netdev/veth.h"
  24 #include "netdev/vlan.h"
  25 #include "netdev/vrf.h"
  26 #include "netdev/vxcan.h"
  27 #include "netdev/vxlan.h"
  28 #include "netdev/wireguard.h"
  29 #include "netlink-util.h"
  30 #include "network-internal.h"
  31 #include "networkd-link.h"
  32 #include "networkd-manager.h"
  33 #include "siphash24.h"
  34 #include "stat-util.h"
  35 #include "string-table.h"
  36 #include "string-util.h"
  37 #include "strv.h"
  38
  39 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  40         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
  41         [NETDEV_KIND_BOND] = &bond_vtable,
  42         [NETDEV_KIND_VLAN] = &vlan_vtable,
  43         [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
  44         [NETDEV_KIND_MACVTAP] = &macvtap_vtable,
  45         [NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
  46         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  47         [NETDEV_KIND_IPIP] = &ipip_vtable,
  48         [NETDEV_KIND_GRE] = &gre_vtable,
  49         [NETDEV_KIND_GRETAP] = &gretap_vtable,
  50         [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
  51         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  52         [NETDEV_KIND_SIT] = &sit_vtable,
  53         [NETDEV_KIND_VTI] = &vti_vtable,
  54         [NETDEV_KIND_VTI6] = &vti6_vtable,
  55         [NETDEV_KIND_VETH] = &veth_vtable,
  56         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  57         [NETDEV_KIND_TUN] = &tun_vtable,
  58         [NETDEV_KIND_TAP] = &tap_vtable,
  59         [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
  60         [NETDEV_KIND_VRF] = &vrf_vtable,
  61         [NETDEV_KIND_VCAN] = &vcan_vtable,
  62         [NETDEV_KIND_GENEVE] = &geneve_vtable,
  63         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
  64         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  65         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  66         [NETDEV_KIND_FOU] = &foutnl_vtable,
  67         [NETDEV_KIND_ERSPAN] = &erspan_vtable,
  68         [NETDEV_KIND_L2TP] = &l2tptnl_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         [NETDEV_KIND_FOU] = "fou",
  99         [NETDEV_KIND_ERSPAN] = "erspan",
 100         [NETDEV_KIND_L2TP] = "l2tp",
 101 };
 102
 103 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 104
 105 int config_parse_netdev_kind(
 106                 const char *unit,
 107                 const char *filename,
 108                 unsigned line,
 109                 const char *section,
 110                 unsigned section_line,
 111                 const char *lvalue,
 112                 int ltype,
 113                 const char *rvalue,
 114                 void *data,
 115                 void *userdata) {
 116
 117         NetDevKind k, *kind = data;
 118
 119         assert(rvalue);
 120         assert(data);
 121
 122         k = netdev_kind_from_string(rvalue);
 123         if (k < 0) {
 124                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 125                 return 0;
 126         }
 127
 128         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 129                 log_syntax(unit, LOG_ERR, filename, line, 0,
 130                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 131                            netdev_kind_to_string(*kind), rvalue);
 132                 return 0;
 133         }
 134
 135         *kind = k;
 136
 137         return 0;
 138 }
 139
 140 static void netdev_callbacks_clear(NetDev *netdev) {
 141         netdev_join_callback *callback;
 142
 143         if (!netdev)
 144                 return;
 145
 146         while ((callback = netdev->callbacks)) {
 147                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 148                 link_unref(callback->link);
 149                 free(callback);
 150         }
 151 }
 152
 153 bool netdev_is_managed(NetDev *netdev) {
 154         if (!netdev || !netdev->manager || !netdev->ifname)
 155                 return false;
 156
 157         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 158 }
 159
 160 static void netdev_detach_from_manager(NetDev *netdev) {
 161         if (netdev->ifname && netdev->manager)
 162                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 163 }
 164
 165 static NetDev *netdev_free(NetDev *netdev) {
 166         assert(netdev);
 167
 168         netdev_callbacks_clear(netdev);
 169
 170         netdev_detach_from_manager(netdev);
 171
 172         free(netdev->filename);
 173
 174         free(netdev->description);
 175         free(netdev->ifname);
 176         free(netdev->mac);
 177         condition_free_list(netdev->conditions);
 178
 179         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 180          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 181          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 182          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 183          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 184          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 185          * call. */
 186         if (netdev->state != _NETDEV_STATE_INVALID &&
 187             NETDEV_VTABLE(netdev) &&
 188             NETDEV_VTABLE(netdev)->done)
 189                 NETDEV_VTABLE(netdev)->done(netdev);
 190
 191         return mfree(netdev);
 192 }
 193
 194 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 195
 196 void netdev_drop(NetDev *netdev) {
 197         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 198                 return;
 199
 200         netdev->state = NETDEV_STATE_LINGER;
 201
 202         log_netdev_debug(netdev, "netdev removed");
 203
 204         netdev_callbacks_clear(netdev);
 205
 206         netdev_detach_from_manager(netdev);
 207
 208         netdev_unref(netdev);
 209
 210         return;
 211 }
 212
 213 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 214         NetDev *netdev;
 215
 216         assert(manager);
 217         assert(name);
 218         assert(ret);
 219
 220         netdev = hashmap_get(manager->netdevs, name);
 221         if (!netdev) {
 222                 *ret = NULL;
 223                 return -ENOENT;
 224         }
 225
 226         *ret = netdev;
 227
 228         return 0;
 229 }
 230
 231 static int netdev_enter_failed(NetDev *netdev) {
 232         netdev->state = NETDEV_STATE_FAILED;
 233
 234         netdev_callbacks_clear(netdev);
 235
 236         return 0;
 237 }
 238
 239 static int netdev_enslave_ready(NetDev *netdev, Link* link, link_netlink_message_handler_t callback) {
 240         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 241         int r;
 242
 243         assert(netdev);
 244         assert(netdev->state == NETDEV_STATE_READY);
 245         assert(netdev->manager);
 246         assert(netdev->manager->rtnl);
 247         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 248         assert(link);
 249         assert(callback);
 250
 251         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 252                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 253                 r = link_down(link);
 254                 if (r < 0)
 255                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 256         }
 257
 258         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 259         if (r < 0)
 260                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 261
 262         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 263         if (r < 0)
 264                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 265
 266         r = netlink_call_async(netdev->manager->rtnl, NULL, req, callback,
 267                                link_netlink_destroy_callback, link);
 268         if (r < 0)
 269                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 270
 271         link_ref(link);
 272
 273         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 274
 275         return 0;
 276 }
 277
 278 static int netdev_enter_ready(NetDev *netdev) {
 279         netdev_join_callback *callback, *callback_next;
 280         int r;
 281
 282         assert(netdev);
 283         assert(netdev->ifname);
 284
 285         if (netdev->state != NETDEV_STATE_CREATING)
 286                 return 0;
 287
 288         netdev->state = NETDEV_STATE_READY;
 289
 290         log_netdev_info(netdev, "netdev ready");
 291
 292         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 293                 /* enslave the links that were attempted to be enslaved before the
 294                  * link was ready */
 295                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 296                 if (r < 0)
 297                         return r;
 298
 299                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 300                 link_unref(callback->link);
 301                 free(callback);
 302         }
 303
 304         if (NETDEV_VTABLE(netdev)->post_create)
 305                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 306
 307         return 0;
 308 }
 309
 310 /* callback for netdev's created without a backing Link */
 311 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 312         int r;
 313
 314         assert(netdev);
 315         assert(netdev->state != _NETDEV_STATE_INVALID);
 316
 317         r = sd_netlink_message_get_errno(m);
 318         if (r == -EEXIST)
 319                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 320         else if (r < 0) {
 321                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 322                 netdev_drop(netdev);
 323
 324                 return 1;
 325         }
 326
 327         log_netdev_debug(netdev, "Created");
 328
 329         return 1;
 330 }
 331
 332 static int netdev_enslave(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 333         int r;
 334
 335         assert(netdev);
 336         assert(netdev->manager);
 337         assert(netdev->manager->rtnl);
 338         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 339
 340         if (netdev->state == NETDEV_STATE_READY) {
 341                 r = netdev_enslave_ready(netdev, link, callback);
 342                 if (r < 0)
 343                         return r;
 344         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 345                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 346
 347                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 348                 if (r >= 0)
 349                         callback(netdev->manager->rtnl, m, link);
 350         } else {
 351                 /* the netdev is not yet read, save this request for when it is */
 352                 netdev_join_callback *cb;
 353
 354                 cb = new(netdev_join_callback, 1);
 355                 if (!cb)
 356                         return log_oom();
 357
 358                 *cb = (netdev_join_callback) {
 359                         .callback = callback,
 360                         .link = link_ref(link),
 361                 };
 362
 363                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 364
 365                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 366         }
 367
 368         return 0;
 369 }
 370
 371 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 372         uint16_t type;
 373         const char *kind;
 374         const char *received_kind;
 375         const char *received_name;
 376         int r, ifindex;
 377
 378         assert(netdev);
 379         assert(message);
 380
 381         r = sd_netlink_message_get_type(message, &type);
 382         if (r < 0)
 383                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 384
 385         if (type != RTM_NEWLINK) {
 386                 log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type.");
 387                 return -EINVAL;
 388         }
 389
 390         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 391         if (r < 0) {
 392                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 393                 netdev_enter_failed(netdev);
 394                 return r;
 395         } else if (ifindex <= 0) {
 396                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 397                 netdev_enter_failed(netdev);
 398                 return -EINVAL;
 399         }
 400
 401         if (netdev->ifindex > 0) {
 402                 if (netdev->ifindex != ifindex) {
 403                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 404                                          ifindex, netdev->ifindex);
 405                         netdev_enter_failed(netdev);
 406                         return -EEXIST;
 407                 } else
 408                         /* ifindex already set to the same for this netdev */
 409                         return 0;
 410         }
 411
 412         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 413         if (r < 0)
 414                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 415
 416         if (!streq(netdev->ifname, received_name)) {
 417                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 418                 netdev_enter_failed(netdev);
 419                 return r;
 420         }
 421
 422         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 423         if (r < 0)
 424                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 425
 426         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 427         if (r < 0)
 428                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 429
 430         r = sd_netlink_message_exit_container(message);
 431         if (r < 0)
 432                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 433
 434         if (netdev->kind == NETDEV_KIND_TAP)
 435                 /* the kernel does not distinguish between tun and tap */
 436                 kind = "tun";
 437         else {
 438                 kind = netdev_kind_to_string(netdev->kind);
 439                 if (!kind) {
 440                         log_netdev_error(netdev, "Could not get kind");
 441                         netdev_enter_failed(netdev);
 442                         return -EINVAL;
 443                 }
 444         }
 445
 446         if (!streq(kind, received_kind)) {
 447                 log_netdev_error(netdev,
 448                                  "Received newlink with wrong KIND %s, "
 449                                  "expected %s", received_kind, kind);
 450                 netdev_enter_failed(netdev);
 451                 return r;
 452         }
 453
 454         netdev->ifindex = ifindex;
 455
 456         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 457
 458         netdev_enter_ready(netdev);
 459
 460         return 0;
 461 }
 462
 463 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 464
 465 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 466         _cleanup_free_ struct ether_addr *mac = NULL;
 467         uint64_t result;
 468         size_t l, sz;
 469         uint8_t *v;
 470         int r;
 471
 472         assert(ifname);
 473         assert(ret);
 474
 475         mac = new0(struct ether_addr, 1);
 476         if (!mac)
 477                 return -ENOMEM;
 478
 479         l = strlen(ifname);
 480         sz = sizeof(sd_id128_t) + l;
 481         v = newa(uint8_t, sz);
 482
 483         /* fetch some persistent data unique to the machine */
 484         r = sd_id128_get_machine((sd_id128_t*) v);
 485         if (r < 0)
 486                 return r;
 487
 488         /* combine with some data unique (on this machine) to this
 489          * netdev */
 490         memcpy(v + sizeof(sd_id128_t), ifname, l);
 491
 492         /* Let's hash the host machine ID plus the container name. We
 493          * use a fixed, but originally randomly created hash key here. */
 494         result = siphash24(v, sz, HASH_KEY.bytes);
 495
 496         assert_cc(ETH_ALEN <= sizeof(result));
 497         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 498
 499         /* see eth_random_addr in the kernel */
 500         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 501         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 502
 503         *ret = TAKE_PTR(mac);
 504
 505         return 0;
 506 }
 507
 508 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 509         int r;
 510
 511         assert(netdev);
 512         assert(!link || callback);
 513
 514         /* create netdev */
 515         if (NETDEV_VTABLE(netdev)->create) {
 516                 assert(!link);
 517
 518                 r = NETDEV_VTABLE(netdev)->create(netdev);
 519                 if (r < 0)
 520                         return r;
 521
 522                 log_netdev_debug(netdev, "Created");
 523         } else {
 524                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 525
 526                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 527                 if (r < 0)
 528                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 529
 530                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 531                 if (r < 0)
 532                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 533
 534                 if (netdev->mac) {
 535                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 536                         if (r < 0)
 537                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 538                 }
 539
 540                 if (netdev->mtu) {
 541                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 542                         if (r < 0)
 543                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 544                 }
 545
 546                 if (link) {
 547                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 548                         if (r < 0)
 549                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 550                 }
 551
 552                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 553                 if (r < 0)
 554                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 555
 556                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 557                 if (r < 0)
 558                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 559
 560                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 561                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 562                         if (r < 0)
 563                                 return r;
 564                 }
 565
 566                 r = sd_netlink_message_close_container(m);
 567                 if (r < 0)
 568                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 569
 570                 r = sd_netlink_message_close_container(m);
 571                 if (r < 0)
 572                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 573
 574                 if (link) {
 575                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 576                                                link_netlink_destroy_callback, link);
 577                         if (r < 0)
 578                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 579
 580                         link_ref(link);
 581                 } else {
 582                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 583                                                netdev_destroy_callback, netdev);
 584                         if (r < 0)
 585                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 586
 587                         netdev_ref(netdev);
 588                 }
 589
 590                 netdev->state = NETDEV_STATE_CREATING;
 591
 592                 log_netdev_debug(netdev, "Creating");
 593         }
 594
 595         return 0;
 596 }
 597
 598 static int netdev_create_after_configured(NetDev *netdev, Link *link) {
 599         assert(netdev);
 600         assert(link);
 601         assert(NETDEV_VTABLE(netdev)->create_after_configured);
 602
 603         return NETDEV_VTABLE(netdev)->create_after_configured(netdev, link);
 604 }
 605
 606 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 607 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 608         int r;
 609
 610         assert(netdev);
 611         assert(netdev->manager);
 612         assert(netdev->manager->rtnl);
 613
 614         switch (netdev_get_create_type(netdev)) {
 615         case NETDEV_CREATE_MASTER:
 616                 r = netdev_enslave(netdev, link, callback);
 617                 if (r < 0)
 618                         return r;
 619
 620                 break;
 621         case NETDEV_CREATE_STACKED:
 622                 r = netdev_create(netdev, link, callback);
 623                 if (r < 0)
 624                         return r;
 625
 626                 break;
 627         case NETDEV_CREATE_AFTER_CONFIGURED:
 628                 r = netdev_create_after_configured(netdev, link);
 629                 if (r < 0)
 630                         return r;
 631                 break;
 632         default:
 633                 assert_not_reached("Can not join independent netdev");
 634         }
 635
 636         return 0;
 637 }
 638
 639 int netdev_load_one(Manager *manager, const char *filename) {
 640         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 641         _cleanup_fclose_ FILE *file = NULL;
 642         const char *dropin_dirname;
 643         bool independent = false;
 644         int r;
 645
 646         assert(manager);
 647         assert(filename);
 648
 649         file = fopen(filename, "re");
 650         if (!file) {
 651                 if (errno == ENOENT)
 652                         return 0;
 653
 654                 return -errno;
 655         }
 656
 657         if (null_or_empty_fd(fileno(file))) {
 658                 log_debug("Skipping empty file: %s", filename);
 659                 return 0;
 660         }
 661
 662         netdev_raw = new(NetDev, 1);
 663         if (!netdev_raw)
 664                 return log_oom();
 665
 666         *netdev_raw = (NetDev) {
 667                 .n_ref = 1,
 668                 .kind = _NETDEV_KIND_INVALID,
 669                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 670         };
 671
 672         dropin_dirname = strjoina(basename(filename), ".d");
 673         r = config_parse_many(filename, NETWORK_DIRS, dropin_dirname,
 674                               "Match\0NetDev\0",
 675                               config_item_perf_lookup, network_netdev_gperf_lookup,
 676                               CONFIG_PARSE_WARN|CONFIG_PARSE_RELAXED, netdev_raw);
 677         if (r < 0)
 678                 return r;
 679
 680         /* skip out early if configuration does not match the environment */
 681         if (!condition_test_list(netdev_raw->conditions, NULL, NULL, NULL)) {
 682                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 683                 return 0;
 684         }
 685
 686         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 687                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 688                 return 0;
 689         }
 690
 691         if (!netdev_raw->ifname) {
 692                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 693                 return 0;
 694         }
 695
 696         r = fseek(file, 0, SEEK_SET);
 697         if (r < 0)
 698                 return -errno;
 699
 700         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 701         if (!netdev)
 702                 return log_oom();
 703
 704         netdev->n_ref = 1;
 705         netdev->manager = manager;
 706         netdev->kind = netdev_raw->kind;
 707         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 708                                                  so that done() will be called on destruction */
 709
 710         if (NETDEV_VTABLE(netdev)->init)
 711                 NETDEV_VTABLE(netdev)->init(netdev);
 712
 713         r = config_parse_many(filename, NETWORK_DIRS, dropin_dirname,
 714                               NETDEV_VTABLE(netdev)->sections,
 715                               config_item_perf_lookup, network_netdev_gperf_lookup,
 716                               CONFIG_PARSE_WARN, netdev);
 717         if (r < 0)
 718                 return r;
 719
 720         /* verify configuration */
 721         if (NETDEV_VTABLE(netdev)->config_verify) {
 722                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 723                 if (r < 0)
 724                         return 0;
 725         }
 726
 727         netdev->filename = strdup(filename);
 728         if (!netdev->filename)
 729                 return log_oom();
 730
 731         if (!netdev->mac && netdev->kind != NETDEV_KIND_VLAN) {
 732                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 733                 if (r < 0)
 734                         return log_netdev_error_errno(netdev, r,
 735                                                       "Failed to generate predictable MAC address for %s: %m",
 736                                                       netdev->ifname);
 737         }
 738
 739         r = hashmap_ensure_allocated(&netdev->manager->netdevs, &string_hash_ops);
 740         if (r < 0)
 741                 return r;
 742
 743         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 744         if (r == -EEXIST) {
 745                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 746
 747                 assert(n);
 748                 log_netdev_warning_errno(netdev, r,
 749                                          "The setting Name=%s in %s conflicts with the one in %s, ignoring",
 750                                          netdev->ifname, netdev->filename, n->filename);
 751
 752                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 753                  * removed from the hashmap 'manager->netdevs'. */
 754                 netdev->ifname = mfree(netdev->ifname);
 755                 return 0;
 756         }
 757         if (r < 0)
 758                 return r;
 759
 760         LIST_HEAD_INIT(netdev->callbacks);
 761
 762         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 763
 764         if (IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_MASTER, NETDEV_CREATE_INDEPENDENT)) {
 765                 r = netdev_create(netdev, NULL, NULL);
 766                 if (r < 0)
 767                         return r;
 768         }
 769
 770         switch (netdev->kind) {
 771         case NETDEV_KIND_IPIP:
 772                 independent = IPIP(netdev)->independent;
 773                 break;
 774         case NETDEV_KIND_GRE:
 775                 independent = GRE(netdev)->independent;
 776                 break;
 777         case NETDEV_KIND_GRETAP:
 778                 independent = GRETAP(netdev)->independent;
 779                 break;
 780         case NETDEV_KIND_IP6GRE:
 781                 independent = IP6GRE(netdev)->independent;
 782                 break;
 783         case NETDEV_KIND_IP6GRETAP:
 784                 independent = IP6GRETAP(netdev)->independent;
 785                 break;
 786         case NETDEV_KIND_SIT:
 787                 independent = SIT(netdev)->independent;
 788                 break;
 789         case NETDEV_KIND_VTI:
 790                 independent = VTI(netdev)->independent;
 791                 break;
 792         case NETDEV_KIND_VTI6:
 793                 independent = VTI6(netdev)->independent;
 794                 break;
 795         case NETDEV_KIND_IP6TNL:
 796                 independent = IP6TNL(netdev)->independent;
 797                 break;
 798         case NETDEV_KIND_ERSPAN:
 799                 independent = ERSPAN(netdev)->independent;
 800                 break;
 801         default:
 802                 break;
 803         }
 804
 805         if (independent) {
 806                 r = netdev_create(netdev, NULL, NULL);
 807                 if (r < 0)
 808                         return r;
 809         }
 810
 811         netdev = NULL;
 812
 813         return 0;
 814 }
 815
 816 int netdev_load(Manager *manager) {
 817         _cleanup_strv_free_ char **files = NULL;
 818         char **f;
 819         int r;
 820
 821         assert(manager);
 822
 823         hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 824
 825         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 826         if (r < 0)
 827                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 828
 829         STRV_FOREACH(f, files) {
 830                 r = netdev_load_one(manager, *f);
 831                 if (r < 0)
 832                         return r;
 833         }
 834
 835         return 0;
 836 }