src/network/netdev/netdev.c

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