src/network/netdev/netdev.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <net/if.h>
   4 #include <netinet/in.h>
   5
   6 #include "alloc-util.h"
   7 #include "conf-files.h"
   8 #include "conf-parser.h"
   9 #include "fd-util.h"
  10 #include "list.h"
  11 #include "netdev/bond.h"
  12 #include "netdev/bridge.h"
  13 #include "netdev/dummy.h"
  14 #include "netdev/fou-tunnel.h"
  15 #include "netdev/geneve.h"
  16 #include "netdev/ipvlan.h"
  17 #include "netdev/l2tp-tunnel.h"
  18 #include "netdev/macsec.h"
  19 #include "netdev/macvlan.h"
  20 #include "netdev/netdev.h"
  21 #include "netdev/netdevsim.h"
  22 #include "netdev/tunnel.h"
  23 #include "netdev/tuntap.h"
  24 #include "netdev/vcan.h"
  25 #include "netdev/veth.h"
  26 #include "netdev/vlan.h"
  27 #include "netdev/vrf.h"
  28 #include "netdev/vxcan.h"
  29 #include "netdev/vxlan.h"
  30 #include "netdev/wireguard.h"
  31 #include "netlink-util.h"
  32 #include "network-internal.h"
  33 #include "networkd-link.h"
  34 #include "networkd-manager.h"
  35 #include "siphash24.h"
  36 #include "stat-util.h"
  37 #include "string-table.h"
  38 #include "string-util.h"
  39 #include "strv.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_IPVTAP] = &ipvtap_vtable,
  49         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  50         [NETDEV_KIND_IPIP] = &ipip_vtable,
  51         [NETDEV_KIND_GRE] = &gre_vtable,
  52         [NETDEV_KIND_GRETAP] = &gretap_vtable,
  53         [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
  54         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  55         [NETDEV_KIND_SIT] = &sit_vtable,
  56         [NETDEV_KIND_VTI] = &vti_vtable,
  57         [NETDEV_KIND_VTI6] = &vti6_vtable,
  58         [NETDEV_KIND_VETH] = &veth_vtable,
  59         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  60         [NETDEV_KIND_TUN] = &tun_vtable,
  61         [NETDEV_KIND_TAP] = &tap_vtable,
  62         [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
  63         [NETDEV_KIND_VRF] = &vrf_vtable,
  64         [NETDEV_KIND_VCAN] = &vcan_vtable,
  65         [NETDEV_KIND_GENEVE] = &geneve_vtable,
  66         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
  67         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  68         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  69         [NETDEV_KIND_FOU] = &foutnl_vtable,
  70         [NETDEV_KIND_ERSPAN] = &erspan_vtable,
  71         [NETDEV_KIND_L2TP] = &l2tptnl_vtable,
  72         [NETDEV_KIND_MACSEC] = &macsec_vtable,
  73 };
  74
  75 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  76         [NETDEV_KIND_BRIDGE] = "bridge",
  77         [NETDEV_KIND_BOND] = "bond",
  78         [NETDEV_KIND_VLAN] = "vlan",
  79         [NETDEV_KIND_MACVLAN] = "macvlan",
  80         [NETDEV_KIND_MACVTAP] = "macvtap",
  81         [NETDEV_KIND_IPVLAN] = "ipvlan",
  82         [NETDEV_KIND_IPVTAP] = "ipvtap",
  83         [NETDEV_KIND_VXLAN] = "vxlan",
  84         [NETDEV_KIND_IPIP] = "ipip",
  85         [NETDEV_KIND_GRE] = "gre",
  86         [NETDEV_KIND_GRETAP] = "gretap",
  87         [NETDEV_KIND_IP6GRE] = "ip6gre",
  88         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
  89         [NETDEV_KIND_SIT] = "sit",
  90         [NETDEV_KIND_VETH] = "veth",
  91         [NETDEV_KIND_VTI] = "vti",
  92         [NETDEV_KIND_VTI6] = "vti6",
  93         [NETDEV_KIND_DUMMY] = "dummy",
  94         [NETDEV_KIND_TUN] = "tun",
  95         [NETDEV_KIND_TAP] = "tap",
  96         [NETDEV_KIND_IP6TNL] = "ip6tnl",
  97         [NETDEV_KIND_VRF] = "vrf",
  98         [NETDEV_KIND_VCAN] = "vcan",
  99         [NETDEV_KIND_GENEVE] = "geneve",
 100         [NETDEV_KIND_VXCAN] = "vxcan",
 101         [NETDEV_KIND_WIREGUARD] = "wireguard",
 102         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 103         [NETDEV_KIND_FOU] = "fou",
 104         [NETDEV_KIND_ERSPAN] = "erspan",
 105         [NETDEV_KIND_L2TP] = "l2tp",
 106         [NETDEV_KIND_MACSEC] = "macsec",
 107 };
 108
 109 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 110
 111 int config_parse_netdev_kind(
 112                 const char *unit,
 113                 const char *filename,
 114                 unsigned line,
 115                 const char *section,
 116                 unsigned section_line,
 117                 const char *lvalue,
 118                 int ltype,
 119                 const char *rvalue,
 120                 void *data,
 121                 void *userdata) {
 122
 123         NetDevKind k, *kind = data;
 124
 125         assert(rvalue);
 126         assert(data);
 127
 128         k = netdev_kind_from_string(rvalue);
 129         if (k < 0) {
 130                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 131                 return 0;
 132         }
 133
 134         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 135                 log_syntax(unit, LOG_ERR, filename, line, 0,
 136                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 137                            netdev_kind_to_string(*kind), rvalue);
 138                 return 0;
 139         }
 140
 141         *kind = k;
 142
 143         return 0;
 144 }
 145
 146 static void netdev_callbacks_clear(NetDev *netdev) {
 147         netdev_join_callback *callback;
 148
 149         if (!netdev)
 150                 return;
 151
 152         while ((callback = netdev->callbacks)) {
 153                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 154                 link_unref(callback->link);
 155                 free(callback);
 156         }
 157 }
 158
 159 bool netdev_is_managed(NetDev *netdev) {
 160         if (!netdev || !netdev->manager || !netdev->ifname)
 161                 return false;
 162
 163         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 164 }
 165
 166 static void netdev_detach_from_manager(NetDev *netdev) {
 167         if (netdev->ifname && netdev->manager)
 168                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 169 }
 170
 171 static NetDev *netdev_free(NetDev *netdev) {
 172         assert(netdev);
 173
 174         netdev_callbacks_clear(netdev);
 175
 176         netdev_detach_from_manager(netdev);
 177
 178         free(netdev->filename);
 179
 180         free(netdev->description);
 181         free(netdev->ifname);
 182         free(netdev->mac);
 183         condition_free_list(netdev->conditions);
 184
 185         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 186          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 187          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 188          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 189          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 190          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 191          * call. */
 192         if (netdev->state != _NETDEV_STATE_INVALID &&
 193             NETDEV_VTABLE(netdev) &&
 194             NETDEV_VTABLE(netdev)->done)
 195                 NETDEV_VTABLE(netdev)->done(netdev);
 196
 197         return mfree(netdev);
 198 }
 199
 200 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 201
 202 void netdev_drop(NetDev *netdev) {
 203         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 204                 return;
 205
 206         netdev->state = NETDEV_STATE_LINGER;
 207
 208         log_netdev_debug(netdev, "netdev removed");
 209
 210         netdev_callbacks_clear(netdev);
 211
 212         netdev_detach_from_manager(netdev);
 213
 214         netdev_unref(netdev);
 215
 216         return;
 217 }
 218
 219 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 220         NetDev *netdev;
 221
 222         assert(manager);
 223         assert(name);
 224         assert(ret);
 225
 226         netdev = hashmap_get(manager->netdevs, name);
 227         if (!netdev) {
 228                 *ret = NULL;
 229                 return -ENOENT;
 230         }
 231
 232         *ret = netdev;
 233
 234         return 0;
 235 }
 236
 237 static int netdev_enter_failed(NetDev *netdev) {
 238         netdev->state = NETDEV_STATE_FAILED;
 239
 240         netdev_callbacks_clear(netdev);
 241
 242         return 0;
 243 }
 244
 245 static int netdev_enslave_ready(NetDev *netdev, Link* link, link_netlink_message_handler_t callback) {
 246         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 247         int r;
 248
 249         assert(netdev);
 250         assert(netdev->state == NETDEV_STATE_READY);
 251         assert(netdev->manager);
 252         assert(netdev->manager->rtnl);
 253         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 254         assert(link);
 255         assert(callback);
 256
 257         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 258                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 259                 r = link_down(link, NULL);
 260                 if (r < 0)
 261                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 262         }
 263
 264         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 265         if (r < 0)
 266                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 267
 268         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 269         if (r < 0)
 270                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 271
 272         r = netlink_call_async(netdev->manager->rtnl, NULL, req, callback,
 273                                link_netlink_destroy_callback, link);
 274         if (r < 0)
 275                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 276
 277         link_ref(link);
 278
 279         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 280
 281         return 0;
 282 }
 283
 284 static int netdev_enter_ready(NetDev *netdev) {
 285         netdev_join_callback *callback, *callback_next;
 286         int r;
 287
 288         assert(netdev);
 289         assert(netdev->ifname);
 290
 291         if (netdev->state != NETDEV_STATE_CREATING)
 292                 return 0;
 293
 294         netdev->state = NETDEV_STATE_READY;
 295
 296         log_netdev_info(netdev, "netdev ready");
 297
 298         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 299                 /* enslave the links that were attempted to be enslaved before the
 300                  * link was ready */
 301                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 302                 if (r < 0)
 303                         return r;
 304
 305                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 306                 link_unref(callback->link);
 307                 free(callback);
 308         }
 309
 310         if (NETDEV_VTABLE(netdev)->post_create)
 311                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 312
 313         return 0;
 314 }
 315
 316 /* callback for netdev's created without a backing Link */
 317 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 318         int r;
 319
 320         assert(netdev);
 321         assert(netdev->state != _NETDEV_STATE_INVALID);
 322
 323         r = sd_netlink_message_get_errno(m);
 324         if (r == -EEXIST)
 325                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 326         else if (r < 0) {
 327                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 328                 netdev_drop(netdev);
 329
 330                 return 1;
 331         }
 332
 333         log_netdev_debug(netdev, "Created");
 334
 335         return 1;
 336 }
 337
 338 static int netdev_enslave(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 339         int r;
 340
 341         assert(netdev);
 342         assert(netdev->manager);
 343         assert(netdev->manager->rtnl);
 344         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 345
 346         if (netdev->state == NETDEV_STATE_READY) {
 347                 r = netdev_enslave_ready(netdev, link, callback);
 348                 if (r < 0)
 349                         return r;
 350         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 351                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 352
 353                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 354                 if (r >= 0)
 355                         callback(netdev->manager->rtnl, m, link);
 356         } else {
 357                 /* the netdev is not yet read, save this request for when it is */
 358                 netdev_join_callback *cb;
 359
 360                 cb = new(netdev_join_callback, 1);
 361                 if (!cb)
 362                         return log_oom();
 363
 364                 *cb = (netdev_join_callback) {
 365                         .callback = callback,
 366                         .link = link_ref(link),
 367                 };
 368
 369                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 370
 371                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 372         }
 373
 374         return 0;
 375 }
 376
 377 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 378         uint16_t type;
 379         const char *kind;
 380         const char *received_kind;
 381         const char *received_name;
 382         int r, ifindex;
 383
 384         assert(netdev);
 385         assert(message);
 386
 387         r = sd_netlink_message_get_type(message, &type);
 388         if (r < 0)
 389                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 390
 391         if (type != RTM_NEWLINK) {
 392                 log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type.");
 393                 return -EINVAL;
 394         }
 395
 396         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 397         if (r < 0) {
 398                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 399                 netdev_enter_failed(netdev);
 400                 return r;
 401         } else if (ifindex <= 0) {
 402                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 403                 netdev_enter_failed(netdev);
 404                 return -EINVAL;
 405         }
 406
 407         if (netdev->ifindex > 0) {
 408                 if (netdev->ifindex != ifindex) {
 409                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 410                                          ifindex, netdev->ifindex);
 411                         netdev_enter_failed(netdev);
 412                         return -EEXIST;
 413                 } else
 414                         /* ifindex already set to the same for this netdev */
 415                         return 0;
 416         }
 417
 418         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 419         if (r < 0)
 420                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 421
 422         if (!streq(netdev->ifname, received_name)) {
 423                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 424                 netdev_enter_failed(netdev);
 425                 return r;
 426         }
 427
 428         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 429         if (r < 0)
 430                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 431
 432         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 433         if (r < 0)
 434                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 435
 436         r = sd_netlink_message_exit_container(message);
 437         if (r < 0)
 438                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 439
 440         if (netdev->kind == NETDEV_KIND_TAP)
 441                 /* the kernel does not distinguish between tun and tap */
 442                 kind = "tun";
 443         else {
 444                 kind = netdev_kind_to_string(netdev->kind);
 445                 if (!kind) {
 446                         log_netdev_error(netdev, "Could not get kind");
 447                         netdev_enter_failed(netdev);
 448                         return -EINVAL;
 449                 }
 450         }
 451
 452         if (!streq(kind, received_kind)) {
 453                 log_netdev_error(netdev,
 454                                  "Received newlink with wrong KIND %s, "
 455                                  "expected %s", received_kind, kind);
 456                 netdev_enter_failed(netdev);
 457                 return r;
 458         }
 459
 460         netdev->ifindex = ifindex;
 461
 462         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 463
 464         netdev_enter_ready(netdev);
 465
 466         return 0;
 467 }
 468
 469 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 470
 471 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 472         _cleanup_free_ struct ether_addr *mac = NULL;
 473         uint64_t result;
 474         size_t l, sz;
 475         uint8_t *v;
 476         int r;
 477
 478         assert(ifname);
 479         assert(ret);
 480
 481         mac = new0(struct ether_addr, 1);
 482         if (!mac)
 483                 return -ENOMEM;
 484
 485         l = strlen(ifname);
 486         sz = sizeof(sd_id128_t) + l;
 487         v = newa(uint8_t, sz);
 488
 489         /* fetch some persistent data unique to the machine */
 490         r = sd_id128_get_machine((sd_id128_t*) v);
 491         if (r < 0)
 492                 return r;
 493
 494         /* combine with some data unique (on this machine) to this
 495          * netdev */
 496         memcpy(v + sizeof(sd_id128_t), ifname, l);
 497
 498         /* Let's hash the host machine ID plus the container name. We
 499          * use a fixed, but originally randomly created hash key here. */
 500         result = siphash24(v, sz, HASH_KEY.bytes);
 501
 502         assert_cc(ETH_ALEN <= sizeof(result));
 503         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 504
 505         /* see eth_random_addr in the kernel */
 506         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 507         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 508
 509         *ret = TAKE_PTR(mac);
 510
 511         return 0;
 512 }
 513
 514 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 515         int r;
 516
 517         assert(netdev);
 518         assert(!link || callback);
 519
 520         /* create netdev */
 521         if (NETDEV_VTABLE(netdev)->create) {
 522                 assert(!link);
 523
 524                 r = NETDEV_VTABLE(netdev)->create(netdev);
 525                 if (r < 0)
 526                         return r;
 527
 528                 log_netdev_debug(netdev, "Created");
 529         } else {
 530                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 531
 532                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 533                 if (r < 0)
 534                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 535
 536                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 537                 if (r < 0)
 538                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 539
 540                 if (netdev->mac) {
 541                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 542                         if (r < 0)
 543                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 544                 }
 545
 546                 if (netdev->mtu) {
 547                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 548                         if (r < 0)
 549                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 550                 }
 551
 552                 if (link) {
 553                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 554                         if (r < 0)
 555                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 556                 }
 557
 558                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 559                 if (r < 0)
 560                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 561
 562                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 563                 if (r < 0)
 564                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 565
 566                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 567                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 568                         if (r < 0)
 569                                 return r;
 570                 }
 571
 572                 r = sd_netlink_message_close_container(m);
 573                 if (r < 0)
 574                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 575
 576                 r = sd_netlink_message_close_container(m);
 577                 if (r < 0)
 578                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 579
 580                 if (link) {
 581                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 582                                                link_netlink_destroy_callback, link);
 583                         if (r < 0)
 584                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 585
 586                         link_ref(link);
 587                 } else {
 588                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 589                                                netdev_destroy_callback, netdev);
 590                         if (r < 0)
 591                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 592
 593                         netdev_ref(netdev);
 594                 }
 595
 596                 netdev->state = NETDEV_STATE_CREATING;
 597
 598                 log_netdev_debug(netdev, "Creating");
 599         }
 600
 601         return 0;
 602 }
 603
 604 static int netdev_create_after_configured(NetDev *netdev, Link *link) {
 605         assert(netdev);
 606         assert(link);
 607         assert(NETDEV_VTABLE(netdev)->create_after_configured);
 608
 609         return NETDEV_VTABLE(netdev)->create_after_configured(netdev, link);
 610 }
 611
 612 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 613 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 614         int r;
 615
 616         assert(netdev);
 617         assert(netdev->manager);
 618         assert(netdev->manager->rtnl);
 619
 620         switch (netdev_get_create_type(netdev)) {
 621         case NETDEV_CREATE_MASTER:
 622                 r = netdev_enslave(netdev, link, callback);
 623                 if (r < 0)
 624                         return r;
 625
 626                 break;
 627         case NETDEV_CREATE_STACKED:
 628                 r = netdev_create(netdev, link, callback);
 629                 if (r < 0)
 630                         return r;
 631
 632                 break;
 633         case NETDEV_CREATE_AFTER_CONFIGURED:
 634                 r = netdev_create_after_configured(netdev, link);
 635                 if (r < 0)
 636                         return r;
 637                 break;
 638         default:
 639                 assert_not_reached("Can not join independent netdev");
 640         }
 641
 642         return 0;
 643 }
 644
 645 int netdev_load_one(Manager *manager, const char *filename) {
 646         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 647         _cleanup_fclose_ FILE *file = NULL;
 648         const char *dropin_dirname;
 649         bool independent = false;
 650         int r;
 651
 652         assert(manager);
 653         assert(filename);
 654
 655         file = fopen(filename, "re");
 656         if (!file) {
 657                 if (errno == ENOENT)
 658                         return 0;
 659
 660                 return -errno;
 661         }
 662
 663         if (null_or_empty_fd(fileno(file))) {
 664                 log_debug("Skipping empty file: %s", filename);
 665                 return 0;
 666         }
 667
 668         netdev_raw = new(NetDev, 1);
 669         if (!netdev_raw)
 670                 return log_oom();
 671
 672         *netdev_raw = (NetDev) {
 673                 .n_ref = 1,
 674                 .kind = _NETDEV_KIND_INVALID,
 675                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 676         };
 677
 678         dropin_dirname = strjoina(basename(filename), ".d");
 679         r = config_parse_many(filename, NETWORK_DIRS, dropin_dirname,
 680                               "Match\0NetDev\0",
 681                               config_item_perf_lookup, network_netdev_gperf_lookup,
 682                               CONFIG_PARSE_WARN|CONFIG_PARSE_RELAXED, netdev_raw);
 683         if (r < 0)
 684                 return r;
 685
 686         /* skip out early if configuration does not match the environment */
 687         if (!condition_test_list(netdev_raw->conditions, NULL, NULL, NULL)) {
 688                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 689                 return 0;
 690         }
 691
 692         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 693                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 694                 return 0;
 695         }
 696
 697         if (!netdev_raw->ifname) {
 698                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 699                 return 0;
 700         }
 701
 702         r = fseek(file, 0, SEEK_SET);
 703         if (r < 0)
 704                 return -errno;
 705
 706         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 707         if (!netdev)
 708                 return log_oom();
 709
 710         netdev->n_ref = 1;
 711         netdev->manager = manager;
 712         netdev->kind = netdev_raw->kind;
 713         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 714                                                  so that done() will be called on destruction */
 715
 716         if (NETDEV_VTABLE(netdev)->init)
 717                 NETDEV_VTABLE(netdev)->init(netdev);
 718
 719         r = config_parse_many(filename, NETWORK_DIRS, dropin_dirname,
 720                               NETDEV_VTABLE(netdev)->sections,
 721                               config_item_perf_lookup, network_netdev_gperf_lookup,
 722                               CONFIG_PARSE_WARN, netdev);
 723         if (r < 0)
 724                 return r;
 725
 726         /* verify configuration */
 727         if (NETDEV_VTABLE(netdev)->config_verify) {
 728                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 729                 if (r < 0)
 730                         return 0;
 731         }
 732
 733         netdev->filename = strdup(filename);
 734         if (!netdev->filename)
 735                 return log_oom();
 736
 737         if (!netdev->mac && NETDEV_VTABLE(netdev)->generate_mac) {
 738                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 739                 if (r < 0)
 740                         return log_netdev_error_errno(netdev, r,
 741                                                       "Failed to generate predictable MAC address for %s: %m",
 742                                                       netdev->ifname);
 743         }
 744
 745         r = hashmap_ensure_allocated(&netdev->manager->netdevs, &string_hash_ops);
 746         if (r < 0)
 747                 return r;
 748
 749         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 750         if (r == -EEXIST) {
 751                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 752
 753                 assert(n);
 754                 log_netdev_warning_errno(netdev, r,
 755                                          "The setting Name=%s in %s conflicts with the one in %s, ignoring",
 756                                          netdev->ifname, netdev->filename, n->filename);
 757
 758                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 759                  * removed from the hashmap 'manager->netdevs'. */
 760                 netdev->ifname = mfree(netdev->ifname);
 761                 return 0;
 762         }
 763         if (r < 0)
 764                 return r;
 765
 766         LIST_HEAD_INIT(netdev->callbacks);
 767
 768         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 769
 770         if (IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_MASTER, NETDEV_CREATE_INDEPENDENT)) {
 771                 r = netdev_create(netdev, NULL, NULL);
 772                 if (r < 0)
 773                         return r;
 774         }
 775
 776         switch (netdev->kind) {
 777         case NETDEV_KIND_IPIP:
 778                 independent = IPIP(netdev)->independent;
 779                 break;
 780         case NETDEV_KIND_GRE:
 781                 independent = GRE(netdev)->independent;
 782                 break;
 783         case NETDEV_KIND_GRETAP:
 784                 independent = GRETAP(netdev)->independent;
 785                 break;
 786         case NETDEV_KIND_IP6GRE:
 787                 independent = IP6GRE(netdev)->independent;
 788                 break;
 789         case NETDEV_KIND_IP6GRETAP:
 790                 independent = IP6GRETAP(netdev)->independent;
 791                 break;
 792         case NETDEV_KIND_SIT:
 793                 independent = SIT(netdev)->independent;
 794                 break;
 795         case NETDEV_KIND_VTI:
 796                 independent = VTI(netdev)->independent;
 797                 break;
 798         case NETDEV_KIND_VTI6:
 799                 independent = VTI6(netdev)->independent;
 800                 break;
 801         case NETDEV_KIND_IP6TNL:
 802                 independent = IP6TNL(netdev)->independent;
 803                 break;
 804         case NETDEV_KIND_ERSPAN:
 805                 independent = ERSPAN(netdev)->independent;
 806                 break;
 807         default:
 808                 break;
 809         }
 810
 811         if (independent) {
 812                 r = netdev_create(netdev, NULL, NULL);
 813                 if (r < 0)
 814                         return r;
 815         }
 816
 817         netdev = NULL;
 818
 819         return 0;
 820 }
 821
 822 int netdev_load(Manager *manager) {
 823         _cleanup_strv_free_ char **files = NULL;
 824         char **f;
 825         int r;
 826
 827         assert(manager);
 828
 829         hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 830
 831         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 832         if (r < 0)
 833                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 834
 835         STRV_FOREACH(f, files) {
 836                 r = netdev_load_one(manager, *f);
 837                 if (r < 0)
 838                         return r;
 839         }
 840
 841         return 0;
 842 }