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