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 "netlink-util.h"
  11 #include "network-internal.h"
  12 #include "netdev/netdev.h"
  13 #include "networkd-manager.h"
  14 #include "networkd-link.h"
  15 #include "siphash24.h"
  16 #include "stat-util.h"
  17 #include "string-table.h"
  18 #include "string-util.h"
  19 #include "strv.h"
  20
  21 #include "netdev/bridge.h"
  22 #include "netdev/bond.h"
  23 #include "netdev/geneve.h"
  24 #include "netdev/vlan.h"
  25 #include "netdev/macvlan.h"
  26 #include "netdev/ipvlan.h"
  27 #include "netdev/vxlan.h"
  28 #include "netdev/tunnel.h"
  29 #include "netdev/tuntap.h"
  30 #include "netdev/veth.h"
  31 #include "netdev/dummy.h"
  32 #include "netdev/vrf.h"
  33 #include "netdev/vcan.h"
  34 #include "netdev/vxcan.h"
  35 #include "netdev/wireguard.h"
  36 #include "netdev/netdevsim.h"
  37 #include "netdev/fou-tunnel.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 };
  69
  70 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  71         [NETDEV_KIND_BRIDGE] = "bridge",
  72         [NETDEV_KIND_BOND] = "bond",
  73         [NETDEV_KIND_VLAN] = "vlan",
  74         [NETDEV_KIND_MACVLAN] = "macvlan",
  75         [NETDEV_KIND_MACVTAP] = "macvtap",
  76         [NETDEV_KIND_IPVLAN] = "ipvlan",
  77         [NETDEV_KIND_VXLAN] = "vxlan",
  78         [NETDEV_KIND_IPIP] = "ipip",
  79         [NETDEV_KIND_GRE] = "gre",
  80         [NETDEV_KIND_GRETAP] = "gretap",
  81         [NETDEV_KIND_IP6GRE] = "ip6gre",
  82         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
  83         [NETDEV_KIND_SIT] = "sit",
  84         [NETDEV_KIND_VETH] = "veth",
  85         [NETDEV_KIND_VTI] = "vti",
  86         [NETDEV_KIND_VTI6] = "vti6",
  87         [NETDEV_KIND_DUMMY] = "dummy",
  88         [NETDEV_KIND_TUN] = "tun",
  89         [NETDEV_KIND_TAP] = "tap",
  90         [NETDEV_KIND_IP6TNL] = "ip6tnl",
  91         [NETDEV_KIND_VRF] = "vrf",
  92         [NETDEV_KIND_VCAN] = "vcan",
  93         [NETDEV_KIND_GENEVE] = "geneve",
  94         [NETDEV_KIND_VXCAN] = "vxcan",
  95         [NETDEV_KIND_WIREGUARD] = "wireguard",
  96         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
  97         [NETDEV_KIND_FOU] = "fou",
  98         [NETDEV_KIND_ERSPAN] = "erspan",
  99 };
 100
 101 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 102
 103 int config_parse_netdev_kind(
 104                 const char *unit,
 105                 const char *filename,
 106                 unsigned line,
 107                 const char *section,
 108                 unsigned section_line,
 109                 const char *lvalue,
 110                 int ltype,
 111                 const char *rvalue,
 112                 void *data,
 113                 void *userdata) {
 114
 115         NetDevKind k, *kind = data;
 116
 117         assert(rvalue);
 118         assert(data);
 119
 120         k = netdev_kind_from_string(rvalue);
 121         if (k < 0) {
 122                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 123                 return 0;
 124         }
 125
 126         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 127                 log_syntax(unit, LOG_ERR, filename, line, 0,
 128                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 129                            netdev_kind_to_string(*kind), rvalue);
 130                 return 0;
 131         }
 132
 133         *kind = k;
 134
 135         return 0;
 136 }
 137
 138 static void netdev_callbacks_clear(NetDev *netdev) {
 139         netdev_join_callback *callback;
 140
 141         if (!netdev)
 142                 return;
 143
 144         while ((callback = netdev->callbacks)) {
 145                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 146                 link_unref(callback->link);
 147                 free(callback);
 148         }
 149 }
 150
 151 bool netdev_is_managed(NetDev *netdev) {
 152         if (!netdev || !netdev->manager || !netdev->ifname)
 153                 return false;
 154
 155         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 156 }
 157
 158 static void netdev_detach_from_manager(NetDev *netdev) {
 159         if (netdev->ifname && netdev->manager)
 160                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 161 }
 162
 163 static NetDev *netdev_free(NetDev *netdev) {
 164         assert(netdev);
 165
 166         netdev_callbacks_clear(netdev);
 167
 168         netdev_detach_from_manager(netdev);
 169
 170         free(netdev->filename);
 171
 172         free(netdev->description);
 173         free(netdev->ifname);
 174         free(netdev->mac);
 175
 176         condition_free_list(netdev->match_host);
 177         condition_free_list(netdev->match_virt);
 178         condition_free_list(netdev->match_kernel_cmdline);
 179         condition_free_list(netdev->match_kernel_version);
 180         condition_free_list(netdev->match_arch);
 181
 182         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 183          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 184          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 185          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 186          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 187          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 188          * call. */
 189         if (netdev->state != _NETDEV_STATE_INVALID &&
 190             NETDEV_VTABLE(netdev) &&
 191             NETDEV_VTABLE(netdev)->done)
 192                 NETDEV_VTABLE(netdev)->done(netdev);
 193
 194         return mfree(netdev);
 195 }
 196
 197 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 198
 199 void netdev_drop(NetDev *netdev) {
 200         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 201                 return;
 202
 203         netdev->state = NETDEV_STATE_LINGER;
 204
 205         log_netdev_debug(netdev, "netdev removed");
 206
 207         netdev_callbacks_clear(netdev);
 208
 209         netdev_detach_from_manager(netdev);
 210
 211         netdev_unref(netdev);
 212
 213         return;
 214 }
 215
 216 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 217         NetDev *netdev;
 218
 219         assert(manager);
 220         assert(name);
 221         assert(ret);
 222
 223         netdev = hashmap_get(manager->netdevs, name);
 224         if (!netdev) {
 225                 *ret = NULL;
 226                 return -ENOENT;
 227         }
 228
 229         *ret = netdev;
 230
 231         return 0;
 232 }
 233
 234 static int netdev_enter_failed(NetDev *netdev) {
 235         netdev->state = NETDEV_STATE_FAILED;
 236
 237         netdev_callbacks_clear(netdev);
 238
 239         return 0;
 240 }
 241
 242 static int netdev_enslave_ready(NetDev *netdev, Link* link, link_netlink_message_handler_t callback) {
 243         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 244         int r;
 245
 246         assert(netdev);
 247         assert(netdev->state == NETDEV_STATE_READY);
 248         assert(netdev->manager);
 249         assert(netdev->manager->rtnl);
 250         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 251         assert(link);
 252         assert(callback);
 253
 254         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 255                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 256                 r = link_down(link);
 257                 if (r < 0)
 258                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 259         }
 260
 261         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 262         if (r < 0)
 263                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 264
 265         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 266         if (r < 0)
 267                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 268
 269         r = netlink_call_async(netdev->manager->rtnl, NULL, req, callback,
 270                                link_netlink_destroy_callback, link);
 271         if (r < 0)
 272                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 273
 274         link_ref(link);
 275
 276         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 277
 278         return 0;
 279 }
 280
 281 static int netdev_enter_ready(NetDev *netdev) {
 282         netdev_join_callback *callback, *callback_next;
 283         int r;
 284
 285         assert(netdev);
 286         assert(netdev->ifname);
 287
 288         if (netdev->state != NETDEV_STATE_CREATING)
 289                 return 0;
 290
 291         netdev->state = NETDEV_STATE_READY;
 292
 293         log_netdev_info(netdev, "netdev ready");
 294
 295         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 296                 /* enslave the links that were attempted to be enslaved before the
 297                  * link was ready */
 298                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 299                 if (r < 0)
 300                         return r;
 301
 302                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 303                 link_unref(callback->link);
 304                 free(callback);
 305         }
 306
 307         if (NETDEV_VTABLE(netdev)->post_create)
 308                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 309
 310         return 0;
 311 }
 312
 313 /* callback for netdev's created without a backing Link */
 314 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 315         int r;
 316
 317         assert(netdev);
 318         assert(netdev->state != _NETDEV_STATE_INVALID);
 319
 320         r = sd_netlink_message_get_errno(m);
 321         if (r == -EEXIST)
 322                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 323         else if (r < 0) {
 324                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 325                 netdev_drop(netdev);
 326
 327                 return 1;
 328         }
 329
 330         log_netdev_debug(netdev, "Created");
 331
 332         return 1;
 333 }
 334
 335 static int netdev_enslave(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 336         int r;
 337
 338         assert(netdev);
 339         assert(netdev->manager);
 340         assert(netdev->manager->rtnl);
 341         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 342
 343         if (netdev->state == NETDEV_STATE_READY) {
 344                 r = netdev_enslave_ready(netdev, link, callback);
 345                 if (r < 0)
 346                         return r;
 347         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 348                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 349
 350                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 351                 if (r >= 0)
 352                         callback(netdev->manager->rtnl, m, link);
 353         } else {
 354                 /* the netdev is not yet read, save this request for when it is */
 355                 netdev_join_callback *cb;
 356
 357                 cb = new(netdev_join_callback, 1);
 358                 if (!cb)
 359                         return log_oom();
 360
 361                 *cb = (netdev_join_callback) {
 362                         .callback = callback,
 363                         .link = link_ref(link),
 364                 };
 365
 366                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 367
 368                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 369         }
 370
 371         return 0;
 372 }
 373
 374 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 375         uint16_t type;
 376         const char *kind;
 377         const char *received_kind;
 378         const char *received_name;
 379         int r, ifindex;
 380
 381         assert(netdev);
 382         assert(message);
 383
 384         r = sd_netlink_message_get_type(message, &type);
 385         if (r < 0)
 386                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 387
 388         if (type != RTM_NEWLINK) {
 389                 log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type.");
 390                 return -EINVAL;
 391         }
 392
 393         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 394         if (r < 0) {
 395                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 396                 netdev_enter_failed(netdev);
 397                 return r;
 398         } else if (ifindex <= 0) {
 399                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 400                 netdev_enter_failed(netdev);
 401                 return -EINVAL;
 402         }
 403
 404         if (netdev->ifindex > 0) {
 405                 if (netdev->ifindex != ifindex) {
 406                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 407                                          ifindex, netdev->ifindex);
 408                         netdev_enter_failed(netdev);
 409                         return -EEXIST;
 410                 } else
 411                         /* ifindex already set to the same for this netdev */
 412                         return 0;
 413         }
 414
 415         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 416         if (r < 0)
 417                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 418
 419         if (!streq(netdev->ifname, received_name)) {
 420                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 421                 netdev_enter_failed(netdev);
 422                 return r;
 423         }
 424
 425         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 426         if (r < 0)
 427                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 428
 429         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 430         if (r < 0)
 431                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 432
 433         r = sd_netlink_message_exit_container(message);
 434         if (r < 0)
 435                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 436
 437         if (netdev->kind == NETDEV_KIND_TAP)
 438                 /* the kernel does not distinguish between tun and tap */
 439                 kind = "tun";
 440         else {
 441                 kind = netdev_kind_to_string(netdev->kind);
 442                 if (!kind) {
 443                         log_netdev_error(netdev, "Could not get kind");
 444                         netdev_enter_failed(netdev);
 445                         return -EINVAL;
 446                 }
 447         }
 448
 449         if (!streq(kind, received_kind)) {
 450                 log_netdev_error(netdev,
 451                                  "Received newlink with wrong KIND %s, "
 452                                  "expected %s", received_kind, kind);
 453                 netdev_enter_failed(netdev);
 454                 return r;
 455         }
 456
 457         netdev->ifindex = ifindex;
 458
 459         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 460
 461         netdev_enter_ready(netdev);
 462
 463         return 0;
 464 }
 465
 466 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 467
 468 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 469         _cleanup_free_ struct ether_addr *mac = NULL;
 470         uint64_t result;
 471         size_t l, sz;
 472         uint8_t *v;
 473         int r;
 474
 475         assert(ifname);
 476         assert(ret);
 477
 478         mac = new0(struct ether_addr, 1);
 479         if (!mac)
 480                 return -ENOMEM;
 481
 482         l = strlen(ifname);
 483         sz = sizeof(sd_id128_t) + l;
 484         v = newa(uint8_t, sz);
 485
 486         /* fetch some persistent data unique to the machine */
 487         r = sd_id128_get_machine((sd_id128_t*) v);
 488         if (r < 0)
 489                 return r;
 490
 491         /* combine with some data unique (on this machine) to this
 492          * netdev */
 493         memcpy(v + sizeof(sd_id128_t), ifname, l);
 494
 495         /* Let's hash the host machine ID plus the container name. We
 496          * use a fixed, but originally randomly created hash key here. */
 497         result = siphash24(v, sz, HASH_KEY.bytes);
 498
 499         assert_cc(ETH_ALEN <= sizeof(result));
 500         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 501
 502         /* see eth_random_addr in the kernel */
 503         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 504         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 505
 506         *ret = TAKE_PTR(mac);
 507
 508         return 0;
 509 }
 510
 511 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 512         int r;
 513
 514         assert(netdev);
 515         assert(!link || callback);
 516
 517         /* create netdev */
 518         if (NETDEV_VTABLE(netdev)->create) {
 519                 assert(!link);
 520
 521                 r = NETDEV_VTABLE(netdev)->create(netdev);
 522                 if (r < 0)
 523                         return r;
 524
 525                 log_netdev_debug(netdev, "Created");
 526         } else {
 527                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 528
 529                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 530                 if (r < 0)
 531                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 532
 533                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 534                 if (r < 0)
 535                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 536
 537                 if (netdev->mac) {
 538                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 539                         if (r < 0)
 540                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 541                 }
 542
 543                 if (netdev->mtu) {
 544                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 545                         if (r < 0)
 546                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 547                 }
 548
 549                 if (link) {
 550                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 551                         if (r < 0)
 552                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 553                 }
 554
 555                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 556                 if (r < 0)
 557                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 558
 559                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 560                 if (r < 0)
 561                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 562
 563                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 564                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 565                         if (r < 0)
 566                                 return r;
 567                 }
 568
 569                 r = sd_netlink_message_close_container(m);
 570                 if (r < 0)
 571                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 572
 573                 r = sd_netlink_message_close_container(m);
 574                 if (r < 0)
 575                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 576
 577                 if (link) {
 578                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 579                                                link_netlink_destroy_callback, link);
 580                         if (r < 0)
 581                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 582
 583                         link_ref(link);
 584                 } else {
 585                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 586                                                netdev_destroy_callback, netdev);
 587                         if (r < 0)
 588                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 589
 590                         netdev_ref(netdev);
 591                 }
 592
 593                 netdev->state = NETDEV_STATE_CREATING;
 594
 595                 log_netdev_debug(netdev, "Creating");
 596         }
 597
 598         return 0;
 599 }
 600
 601 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 602 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 603         int r;
 604
 605         assert(netdev);
 606         assert(netdev->manager);
 607         assert(netdev->manager->rtnl);
 608         assert(NETDEV_VTABLE(netdev));
 609
 610         switch (NETDEV_VTABLE(netdev)->create_type) {
 611         case NETDEV_CREATE_MASTER:
 612                 r = netdev_enslave(netdev, link, callback);
 613                 if (r < 0)
 614                         return r;
 615
 616                 break;
 617         case NETDEV_CREATE_STACKED:
 618                 r = netdev_create(netdev, link, callback);
 619                 if (r < 0)
 620                         return r;
 621
 622                 break;
 623         default:
 624                 assert_not_reached("Can not join independent netdev");
 625         }
 626
 627         return 0;
 628 }
 629
 630 int netdev_load_one(Manager *manager, const char *filename) {
 631         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 632         _cleanup_fclose_ FILE *file = NULL;
 633         const char *dropin_dirname;
 634         bool independent = false;
 635         int r;
 636
 637         assert(manager);
 638         assert(filename);
 639
 640         file = fopen(filename, "re");
 641         if (!file) {
 642                 if (errno == ENOENT)
 643                         return 0;
 644
 645                 return -errno;
 646         }
 647
 648         if (null_or_empty_fd(fileno(file))) {
 649                 log_debug("Skipping empty file: %s", filename);
 650                 return 0;
 651         }
 652
 653         netdev_raw = new(NetDev, 1);
 654         if (!netdev_raw)
 655                 return log_oom();
 656
 657         *netdev_raw = (NetDev) {
 658                 .n_ref = 1,
 659                 .kind = _NETDEV_KIND_INVALID,
 660                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 661         };
 662
 663         dropin_dirname = strjoina(basename(filename), ".d");
 664         r = config_parse_many(filename, network_dirs, dropin_dirname,
 665                               "Match\0NetDev\0",
 666                               config_item_perf_lookup, network_netdev_gperf_lookup,
 667                               CONFIG_PARSE_WARN|CONFIG_PARSE_RELAXED, netdev_raw);
 668         if (r < 0)
 669                 return r;
 670
 671         /* skip out early if configuration does not match the environment */
 672         if (net_match_config(NULL, NULL, NULL, NULL, NULL,
 673                              netdev_raw->match_host, netdev_raw->match_virt,
 674                              netdev_raw->match_kernel_cmdline, netdev_raw->match_kernel_version,
 675                              netdev_raw->match_arch,
 676                              NULL, NULL, NULL, NULL, NULL, NULL) <= 0)
 677                 return 0;
 678
 679         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 680                 log_warning("NetDev has no Kind configured in %s. Ignoring", filename);
 681                 return 0;
 682         }
 683
 684         if (!netdev_raw->ifname) {
 685                 log_warning("NetDev without Name configured in %s. Ignoring", filename);
 686                 return 0;
 687         }
 688
 689         r = fseek(file, 0, SEEK_SET);
 690         if (r < 0)
 691                 return -errno;
 692
 693         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 694         if (!netdev)
 695                 return log_oom();
 696
 697         netdev->n_ref = 1;
 698         netdev->manager = manager;
 699         netdev->kind = netdev_raw->kind;
 700         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time, so that done() will be called on destruction */
 701
 702         if (NETDEV_VTABLE(netdev)->init)
 703                 NETDEV_VTABLE(netdev)->init(netdev);
 704
 705         r = config_parse_many(filename, network_dirs, dropin_dirname,
 706                               NETDEV_VTABLE(netdev)->sections,
 707                               config_item_perf_lookup, network_netdev_gperf_lookup,
 708                               CONFIG_PARSE_WARN, netdev);
 709         if (r < 0)
 710                 return r;
 711
 712         /* verify configuration */
 713         if (NETDEV_VTABLE(netdev)->config_verify) {
 714                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 715                 if (r < 0)
 716                         return 0;
 717         }
 718
 719         netdev->filename = strdup(filename);
 720         if (!netdev->filename)
 721                 return log_oom();
 722
 723         if (!netdev->mac && netdev->kind != NETDEV_KIND_VLAN) {
 724                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 725                 if (r < 0)
 726                         return log_error_errno(r, "Failed to generate predictable MAC address for %s: %m", netdev->ifname);
 727         }
 728
 729         r = hashmap_ensure_allocated(&netdev->manager->netdevs, &string_hash_ops);
 730         if (r < 0)
 731                 return r;
 732
 733         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 734         if (r < 0)
 735                 return r;
 736
 737         LIST_HEAD_INIT(netdev->callbacks);
 738
 739         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 740
 741         switch (NETDEV_VTABLE(netdev)->create_type) {
 742         case NETDEV_CREATE_MASTER:
 743         case NETDEV_CREATE_INDEPENDENT:
 744                 r = netdev_create(netdev, NULL, NULL);
 745                 if (r < 0)
 746                         return r;
 747
 748                 break;
 749         default:
 750                 break;
 751         }
 752
 753         switch (netdev->kind) {
 754         case NETDEV_KIND_IPIP:
 755                 independent = IPIP(netdev)->independent;
 756                 break;
 757         case NETDEV_KIND_GRE:
 758                 independent = GRE(netdev)->independent;
 759                 break;
 760         case NETDEV_KIND_GRETAP:
 761                 independent = GRETAP(netdev)->independent;
 762                 break;
 763         case NETDEV_KIND_IP6GRE:
 764                 independent = IP6GRE(netdev)->independent;
 765                 break;
 766         case NETDEV_KIND_IP6GRETAP:
 767                 independent = IP6GRETAP(netdev)->independent;
 768                 break;
 769         case NETDEV_KIND_SIT:
 770                 independent = SIT(netdev)->independent;
 771                 break;
 772         case NETDEV_KIND_VTI:
 773                 independent = VTI(netdev)->independent;
 774                 break;
 775         case NETDEV_KIND_VTI6:
 776                 independent = VTI6(netdev)->independent;
 777                 break;
 778         case NETDEV_KIND_IP6TNL:
 779                 independent = IP6TNL(netdev)->independent;
 780                 break;
 781         default:
 782                 break;
 783         }
 784
 785         if (independent) {
 786                 r = netdev_create(netdev, NULL, NULL);
 787                 if (r < 0)
 788                         return r;
 789         }
 790
 791         netdev = NULL;
 792
 793         return 0;
 794 }
 795
 796 int netdev_load(Manager *manager) {
 797         _cleanup_strv_free_ char **files = NULL;
 798         char **f;
 799         int r;
 800
 801         assert(manager);
 802
 803         hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 804
 805         r = conf_files_list_strv(&files, ".netdev", NULL, 0, network_dirs);
 806         if (r < 0)
 807                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 808
 809         STRV_FOREACH_BACKWARDS(f, files) {
 810                 r = netdev_load_one(manager, *f);
 811                 if (r < 0)
 812                         return r;
 813         }
 814
 815         return 0;
 816 }