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/nlmon.h"
  23 #include "netdev/tunnel.h"
  24 #include "netdev/tuntap.h"
  25 #include "netdev/vcan.h"
  26 #include "netdev/veth.h"
  27 #include "netdev/vlan.h"
  28 #include "netdev/vrf.h"
  29 #include "netdev/vxcan.h"
  30 #include "netdev/vxlan.h"
  31 #include "netdev/wireguard.h"
  32 #include "netdev/xfrm.h"
  33 #include "netlink-util.h"
  34 #include "network-internal.h"
  35 #include "networkd-link.h"
  36 #include "networkd-manager.h"
  37 #include "siphash24.h"
  38 #include "stat-util.h"
  39 #include "string-table.h"
  40 #include "string-util.h"
  41 #include "strv.h"
  42
  43 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  44         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
  45         [NETDEV_KIND_BOND] = &bond_vtable,
  46         [NETDEV_KIND_VLAN] = &vlan_vtable,
  47         [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
  48         [NETDEV_KIND_MACVTAP] = &macvtap_vtable,
  49         [NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
  50         [NETDEV_KIND_IPVTAP] = &ipvtap_vtable,
  51         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  52         [NETDEV_KIND_IPIP] = &ipip_vtable,
  53         [NETDEV_KIND_GRE] = &gre_vtable,
  54         [NETDEV_KIND_GRETAP] = &gretap_vtable,
  55         [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
  56         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  57         [NETDEV_KIND_SIT] = &sit_vtable,
  58         [NETDEV_KIND_VTI] = &vti_vtable,
  59         [NETDEV_KIND_VTI6] = &vti6_vtable,
  60         [NETDEV_KIND_VETH] = &veth_vtable,
  61         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  62         [NETDEV_KIND_TUN] = &tun_vtable,
  63         [NETDEV_KIND_TAP] = &tap_vtable,
  64         [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
  65         [NETDEV_KIND_VRF] = &vrf_vtable,
  66         [NETDEV_KIND_VCAN] = &vcan_vtable,
  67         [NETDEV_KIND_GENEVE] = &geneve_vtable,
  68         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
  69         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  70         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  71         [NETDEV_KIND_FOU] = &foutnl_vtable,
  72         [NETDEV_KIND_ERSPAN] = &erspan_vtable,
  73         [NETDEV_KIND_L2TP] = &l2tptnl_vtable,
  74         [NETDEV_KIND_MACSEC] = &macsec_vtable,
  75         [NETDEV_KIND_NLMON] = &nlmon_vtable,
  76         [NETDEV_KIND_XFRM] = &xfrm_vtable,
  77 };
  78
  79 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  80         [NETDEV_KIND_BRIDGE] = "bridge",
  81         [NETDEV_KIND_BOND] = "bond",
  82         [NETDEV_KIND_VLAN] = "vlan",
  83         [NETDEV_KIND_MACVLAN] = "macvlan",
  84         [NETDEV_KIND_MACVTAP] = "macvtap",
  85         [NETDEV_KIND_IPVLAN] = "ipvlan",
  86         [NETDEV_KIND_IPVTAP] = "ipvtap",
  87         [NETDEV_KIND_VXLAN] = "vxlan",
  88         [NETDEV_KIND_IPIP] = "ipip",
  89         [NETDEV_KIND_GRE] = "gre",
  90         [NETDEV_KIND_GRETAP] = "gretap",
  91         [NETDEV_KIND_IP6GRE] = "ip6gre",
  92         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
  93         [NETDEV_KIND_SIT] = "sit",
  94         [NETDEV_KIND_VETH] = "veth",
  95         [NETDEV_KIND_VTI] = "vti",
  96         [NETDEV_KIND_VTI6] = "vti6",
  97         [NETDEV_KIND_DUMMY] = "dummy",
  98         [NETDEV_KIND_TUN] = "tun",
  99         [NETDEV_KIND_TAP] = "tap",
 100         [NETDEV_KIND_IP6TNL] = "ip6tnl",
 101         [NETDEV_KIND_VRF] = "vrf",
 102         [NETDEV_KIND_VCAN] = "vcan",
 103         [NETDEV_KIND_GENEVE] = "geneve",
 104         [NETDEV_KIND_VXCAN] = "vxcan",
 105         [NETDEV_KIND_WIREGUARD] = "wireguard",
 106         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 107         [NETDEV_KIND_FOU] = "fou",
 108         [NETDEV_KIND_ERSPAN] = "erspan",
 109         [NETDEV_KIND_L2TP] = "l2tp",
 110         [NETDEV_KIND_MACSEC] = "macsec",
 111         [NETDEV_KIND_NLMON] = "nlmon",
 112         [NETDEV_KIND_XFRM] = "xfrm",
 113 };
 114
 115 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 116
 117 int config_parse_netdev_kind(
 118                 const char *unit,
 119                 const char *filename,
 120                 unsigned line,
 121                 const char *section,
 122                 unsigned section_line,
 123                 const char *lvalue,
 124                 int ltype,
 125                 const char *rvalue,
 126                 void *data,
 127                 void *userdata) {
 128
 129         NetDevKind k, *kind = data;
 130
 131         assert(rvalue);
 132         assert(data);
 133
 134         k = netdev_kind_from_string(rvalue);
 135         if (k < 0) {
 136                 log_syntax(unit, LOG_ERR, filename, line, 0, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 137                 return 0;
 138         }
 139
 140         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 141                 log_syntax(unit, LOG_ERR, filename, line, 0,
 142                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 143                            netdev_kind_to_string(*kind), rvalue);
 144                 return 0;
 145         }
 146
 147         *kind = k;
 148
 149         return 0;
 150 }
 151
 152 static void netdev_callbacks_clear(NetDev *netdev) {
 153         netdev_join_callback *callback;
 154
 155         if (!netdev)
 156                 return;
 157
 158         while ((callback = netdev->callbacks)) {
 159                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 160                 link_unref(callback->link);
 161                 free(callback);
 162         }
 163 }
 164
 165 bool netdev_is_managed(NetDev *netdev) {
 166         if (!netdev || !netdev->manager || !netdev->ifname)
 167                 return false;
 168
 169         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 170 }
 171
 172 static void netdev_detach_from_manager(NetDev *netdev) {
 173         if (netdev->ifname && netdev->manager)
 174                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 175 }
 176
 177 static NetDev *netdev_free(NetDev *netdev) {
 178         assert(netdev);
 179
 180         netdev_callbacks_clear(netdev);
 181
 182         netdev_detach_from_manager(netdev);
 183
 184         free(netdev->filename);
 185
 186         free(netdev->description);
 187         free(netdev->ifname);
 188         free(netdev->mac);
 189         condition_free_list(netdev->conditions);
 190
 191         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 192          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 193          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 194          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 195          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 196          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 197          * call. */
 198         if (netdev->state != _NETDEV_STATE_INVALID &&
 199             NETDEV_VTABLE(netdev) &&
 200             NETDEV_VTABLE(netdev)->done)
 201                 NETDEV_VTABLE(netdev)->done(netdev);
 202
 203         return mfree(netdev);
 204 }
 205
 206 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 207
 208 void netdev_drop(NetDev *netdev) {
 209         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 210                 return;
 211
 212         netdev->state = NETDEV_STATE_LINGER;
 213
 214         log_netdev_debug(netdev, "netdev removed");
 215
 216         netdev_callbacks_clear(netdev);
 217
 218         netdev_detach_from_manager(netdev);
 219
 220         netdev_unref(netdev);
 221
 222         return;
 223 }
 224
 225 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 226         NetDev *netdev;
 227
 228         assert(manager);
 229         assert(name);
 230         assert(ret);
 231
 232         netdev = hashmap_get(manager->netdevs, name);
 233         if (!netdev) {
 234                 *ret = NULL;
 235                 return -ENOENT;
 236         }
 237
 238         *ret = netdev;
 239
 240         return 0;
 241 }
 242
 243 static int netdev_enter_failed(NetDev *netdev) {
 244         netdev->state = NETDEV_STATE_FAILED;
 245
 246         netdev_callbacks_clear(netdev);
 247
 248         return 0;
 249 }
 250
 251 static int netdev_enslave_ready(NetDev *netdev, Link* link, link_netlink_message_handler_t callback) {
 252         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 253         int r;
 254
 255         assert(netdev);
 256         assert(netdev->state == NETDEV_STATE_READY);
 257         assert(netdev->manager);
 258         assert(netdev->manager->rtnl);
 259         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 260         assert(link);
 261         assert(callback);
 262
 263         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 264                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 265                 r = link_down(link, NULL);
 266                 if (r < 0)
 267                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 268         }
 269
 270         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 271         if (r < 0)
 272                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 273
 274         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 275         if (r < 0)
 276                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 277
 278         r = netlink_call_async(netdev->manager->rtnl, NULL, req, callback,
 279                                link_netlink_destroy_callback, link);
 280         if (r < 0)
 281                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 282
 283         link_ref(link);
 284
 285         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 286
 287         return 0;
 288 }
 289
 290 static int netdev_enter_ready(NetDev *netdev) {
 291         netdev_join_callback *callback, *callback_next;
 292         int r;
 293
 294         assert(netdev);
 295         assert(netdev->ifname);
 296
 297         if (netdev->state != NETDEV_STATE_CREATING)
 298                 return 0;
 299
 300         netdev->state = NETDEV_STATE_READY;
 301
 302         log_netdev_info(netdev, "netdev ready");
 303
 304         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 305                 /* enslave the links that were attempted to be enslaved before the
 306                  * link was ready */
 307                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 308                 if (r < 0)
 309                         return r;
 310
 311                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 312                 link_unref(callback->link);
 313                 free(callback);
 314         }
 315
 316         if (NETDEV_VTABLE(netdev)->post_create)
 317                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 318
 319         return 0;
 320 }
 321
 322 /* callback for netdev's created without a backing Link */
 323 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 324         int r;
 325
 326         assert(netdev);
 327         assert(netdev->state != _NETDEV_STATE_INVALID);
 328
 329         r = sd_netlink_message_get_errno(m);
 330         if (r == -EEXIST)
 331                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 332         else if (r < 0) {
 333                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 334                 netdev_drop(netdev);
 335
 336                 return 1;
 337         }
 338
 339         log_netdev_debug(netdev, "Created");
 340
 341         return 1;
 342 }
 343
 344 static int netdev_enslave(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 345         int r;
 346
 347         assert(netdev);
 348         assert(netdev->manager);
 349         assert(netdev->manager->rtnl);
 350         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 351
 352         if (netdev->state == NETDEV_STATE_READY) {
 353                 r = netdev_enslave_ready(netdev, link, callback);
 354                 if (r < 0)
 355                         return r;
 356         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 357                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 358
 359                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 360                 if (r >= 0)
 361                         callback(netdev->manager->rtnl, m, link);
 362         } else {
 363                 /* the netdev is not yet read, save this request for when it is */
 364                 netdev_join_callback *cb;
 365
 366                 cb = new(netdev_join_callback, 1);
 367                 if (!cb)
 368                         return log_oom();
 369
 370                 *cb = (netdev_join_callback) {
 371                         .callback = callback,
 372                         .link = link_ref(link),
 373                 };
 374
 375                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 376
 377                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 378         }
 379
 380         return 0;
 381 }
 382
 383 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 384         uint16_t type;
 385         const char *kind;
 386         const char *received_kind;
 387         const char *received_name;
 388         int r, ifindex;
 389
 390         assert(netdev);
 391         assert(message);
 392
 393         r = sd_netlink_message_get_type(message, &type);
 394         if (r < 0)
 395                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 396
 397         if (type != RTM_NEWLINK) {
 398                 log_netdev_error(netdev, "Cannot set ifindex from unexpected rtnl message type.");
 399                 return -EINVAL;
 400         }
 401
 402         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 403         if (r < 0) {
 404                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 405                 netdev_enter_failed(netdev);
 406                 return r;
 407         } else if (ifindex <= 0) {
 408                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 409                 netdev_enter_failed(netdev);
 410                 return -EINVAL;
 411         }
 412
 413         if (netdev->ifindex > 0) {
 414                 if (netdev->ifindex != ifindex) {
 415                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 416                                          ifindex, netdev->ifindex);
 417                         netdev_enter_failed(netdev);
 418                         return -EEXIST;
 419                 } else
 420                         /* ifindex already set to the same for this netdev */
 421                         return 0;
 422         }
 423
 424         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 425         if (r < 0)
 426                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 427
 428         if (!streq(netdev->ifname, received_name)) {
 429                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 430                 netdev_enter_failed(netdev);
 431                 return r;
 432         }
 433
 434         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 435         if (r < 0)
 436                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 437
 438         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 439         if (r < 0)
 440                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 441
 442         r = sd_netlink_message_exit_container(message);
 443         if (r < 0)
 444                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 445
 446         if (netdev->kind == NETDEV_KIND_TAP)
 447                 /* the kernel does not distinguish between tun and tap */
 448                 kind = "tun";
 449         else {
 450                 kind = netdev_kind_to_string(netdev->kind);
 451                 if (!kind) {
 452                         log_netdev_error(netdev, "Could not get kind");
 453                         netdev_enter_failed(netdev);
 454                         return -EINVAL;
 455                 }
 456         }
 457
 458         if (!streq(kind, received_kind)) {
 459                 log_netdev_error(netdev,
 460                                  "Received newlink with wrong KIND %s, "
 461                                  "expected %s", received_kind, kind);
 462                 netdev_enter_failed(netdev);
 463                 return r;
 464         }
 465
 466         netdev->ifindex = ifindex;
 467
 468         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 469
 470         netdev_enter_ready(netdev);
 471
 472         return 0;
 473 }
 474
 475 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 476
 477 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 478         _cleanup_free_ struct ether_addr *mac = NULL;
 479         uint64_t result;
 480         size_t l, sz;
 481         uint8_t *v;
 482         int r;
 483
 484         assert(ifname);
 485         assert(ret);
 486
 487         mac = new0(struct ether_addr, 1);
 488         if (!mac)
 489                 return -ENOMEM;
 490
 491         l = strlen(ifname);
 492         sz = sizeof(sd_id128_t) + l;
 493         v = newa(uint8_t, sz);
 494
 495         /* fetch some persistent data unique to the machine */
 496         r = sd_id128_get_machine((sd_id128_t*) v);
 497         if (r < 0)
 498                 return r;
 499
 500         /* combine with some data unique (on this machine) to this
 501          * netdev */
 502         memcpy(v + sizeof(sd_id128_t), ifname, l);
 503
 504         /* Let's hash the host machine ID plus the container name. We
 505          * use a fixed, but originally randomly created hash key here. */
 506         result = siphash24(v, sz, HASH_KEY.bytes);
 507
 508         assert_cc(ETH_ALEN <= sizeof(result));
 509         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 510
 511         /* see eth_random_addr in the kernel */
 512         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 513         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 514
 515         *ret = TAKE_PTR(mac);
 516
 517         return 0;
 518 }
 519
 520 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 521         int r;
 522
 523         assert(netdev);
 524         assert(!link || callback);
 525
 526         /* create netdev */
 527         if (NETDEV_VTABLE(netdev)->create) {
 528                 assert(!link);
 529
 530                 r = NETDEV_VTABLE(netdev)->create(netdev);
 531                 if (r < 0)
 532                         return r;
 533
 534                 log_netdev_debug(netdev, "Created");
 535         } else {
 536                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 537
 538                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 539                 if (r < 0)
 540                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 541
 542                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 543                 if (r < 0)
 544                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 545
 546                 if (netdev->mac) {
 547                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 548                         if (r < 0)
 549                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 550                 }
 551
 552                 if (netdev->mtu) {
 553                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 554                         if (r < 0)
 555                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 556                 }
 557
 558                 if (link) {
 559                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 560                         if (r < 0)
 561                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 562                 }
 563
 564                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 565                 if (r < 0)
 566                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 567
 568                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 569                 if (r < 0)
 570                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 571
 572                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 573                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 574                         if (r < 0)
 575                                 return r;
 576                 }
 577
 578                 r = sd_netlink_message_close_container(m);
 579                 if (r < 0)
 580                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 581
 582                 r = sd_netlink_message_close_container(m);
 583                 if (r < 0)
 584                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 585
 586                 if (link) {
 587                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 588                                                link_netlink_destroy_callback, link);
 589                         if (r < 0)
 590                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 591
 592                         link_ref(link);
 593                 } else {
 594                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 595                                                netdev_destroy_callback, netdev);
 596                         if (r < 0)
 597                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 598
 599                         netdev_ref(netdev);
 600                 }
 601
 602                 netdev->state = NETDEV_STATE_CREATING;
 603
 604                 log_netdev_debug(netdev, "Creating");
 605         }
 606
 607         return 0;
 608 }
 609
 610 static int netdev_create_after_configured(NetDev *netdev, Link *link) {
 611         assert(netdev);
 612         assert(link);
 613         assert(NETDEV_VTABLE(netdev)->create_after_configured);
 614
 615         return NETDEV_VTABLE(netdev)->create_after_configured(netdev, link);
 616 }
 617
 618 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 619 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 620         int r;
 621
 622         assert(netdev);
 623         assert(netdev->manager);
 624         assert(netdev->manager->rtnl);
 625
 626         switch (netdev_get_create_type(netdev)) {
 627         case NETDEV_CREATE_MASTER:
 628                 r = netdev_enslave(netdev, link, callback);
 629                 if (r < 0)
 630                         return r;
 631
 632                 break;
 633         case NETDEV_CREATE_STACKED:
 634                 r = netdev_create(netdev, link, callback);
 635                 if (r < 0)
 636                         return r;
 637
 638                 break;
 639         case NETDEV_CREATE_AFTER_CONFIGURED:
 640                 r = netdev_create_after_configured(netdev, link);
 641                 if (r < 0)
 642                         return r;
 643                 break;
 644         default:
 645                 assert_not_reached("Can not join independent netdev");
 646         }
 647
 648         return 0;
 649 }
 650
 651 int netdev_load_one(Manager *manager, const char *filename) {
 652         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 653         _cleanup_fclose_ FILE *file = NULL;
 654         const char *dropin_dirname;
 655         bool independent = false;
 656         int r;
 657
 658         assert(manager);
 659         assert(filename);
 660
 661         file = fopen(filename, "re");
 662         if (!file) {
 663                 if (errno == ENOENT)
 664                         return 0;
 665
 666                 return -errno;
 667         }
 668
 669         if (null_or_empty_fd(fileno(file))) {
 670                 log_debug("Skipping empty file: %s", filename);
 671                 return 0;
 672         }
 673
 674         netdev_raw = new(NetDev, 1);
 675         if (!netdev_raw)
 676                 return log_oom();
 677
 678         *netdev_raw = (NetDev) {
 679                 .n_ref = 1,
 680                 .kind = _NETDEV_KIND_INVALID,
 681                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 682         };
 683
 684         dropin_dirname = strjoina(basename(filename), ".d");
 685         r = config_parse_many(filename, NETWORK_DIRS, dropin_dirname,
 686                               "Match\0NetDev\0",
 687                               config_item_perf_lookup, network_netdev_gperf_lookup,
 688                               CONFIG_PARSE_WARN|CONFIG_PARSE_RELAXED, netdev_raw);
 689         if (r < 0)
 690                 return r;
 691
 692         /* skip out early if configuration does not match the environment */
 693         if (!condition_test_list(netdev_raw->conditions, NULL, NULL, NULL)) {
 694                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 695                 return 0;
 696         }
 697
 698         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 699                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 700                 return 0;
 701         }
 702
 703         if (!netdev_raw->ifname) {
 704                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 705                 return 0;
 706         }
 707
 708         r = fseek(file, 0, SEEK_SET);
 709         if (r < 0)
 710                 return -errno;
 711
 712         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 713         if (!netdev)
 714                 return log_oom();
 715
 716         netdev->n_ref = 1;
 717         netdev->manager = manager;
 718         netdev->kind = netdev_raw->kind;
 719         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 720                                                  so that done() will be called on destruction */
 721
 722         if (NETDEV_VTABLE(netdev)->init)
 723                 NETDEV_VTABLE(netdev)->init(netdev);
 724
 725         r = config_parse_many(filename, NETWORK_DIRS, dropin_dirname,
 726                               NETDEV_VTABLE(netdev)->sections,
 727                               config_item_perf_lookup, network_netdev_gperf_lookup,
 728                               CONFIG_PARSE_WARN, netdev);
 729         if (r < 0)
 730                 return r;
 731
 732         /* verify configuration */
 733         if (NETDEV_VTABLE(netdev)->config_verify) {
 734                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 735                 if (r < 0)
 736                         return 0;
 737         }
 738
 739         netdev->filename = strdup(filename);
 740         if (!netdev->filename)
 741                 return log_oom();
 742
 743         if (!netdev->mac && NETDEV_VTABLE(netdev)->generate_mac) {
 744                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 745                 if (r < 0)
 746                         return log_netdev_error_errno(netdev, r,
 747                                                       "Failed to generate predictable MAC address for %s: %m",
 748                                                       netdev->ifname);
 749         }
 750
 751         r = hashmap_ensure_allocated(&netdev->manager->netdevs, &string_hash_ops);
 752         if (r < 0)
 753                 return r;
 754
 755         r = hashmap_put(netdev->manager->netdevs, netdev->ifname, netdev);
 756         if (r == -EEXIST) {
 757                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 758
 759                 assert(n);
 760                 log_netdev_warning_errno(netdev, r,
 761                                          "The setting Name=%s in %s conflicts with the one in %s, ignoring",
 762                                          netdev->ifname, netdev->filename, n->filename);
 763
 764                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 765                  * removed from the hashmap 'manager->netdevs'. */
 766                 netdev->ifname = mfree(netdev->ifname);
 767                 return 0;
 768         }
 769         if (r < 0)
 770                 return r;
 771
 772         LIST_HEAD_INIT(netdev->callbacks);
 773
 774         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 775
 776         if (IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_MASTER, NETDEV_CREATE_INDEPENDENT)) {
 777                 r = netdev_create(netdev, NULL, NULL);
 778                 if (r < 0)
 779                         return r;
 780         }
 781
 782         switch (netdev->kind) {
 783         case NETDEV_KIND_IPIP:
 784                 independent = IPIP(netdev)->independent;
 785                 break;
 786         case NETDEV_KIND_GRE:
 787                 independent = GRE(netdev)->independent;
 788                 break;
 789         case NETDEV_KIND_GRETAP:
 790                 independent = GRETAP(netdev)->independent;
 791                 break;
 792         case NETDEV_KIND_IP6GRE:
 793                 independent = IP6GRE(netdev)->independent;
 794                 break;
 795         case NETDEV_KIND_IP6GRETAP:
 796                 independent = IP6GRETAP(netdev)->independent;
 797                 break;
 798         case NETDEV_KIND_SIT:
 799                 independent = SIT(netdev)->independent;
 800                 break;
 801         case NETDEV_KIND_VTI:
 802                 independent = VTI(netdev)->independent;
 803                 break;
 804         case NETDEV_KIND_VTI6:
 805                 independent = VTI6(netdev)->independent;
 806                 break;
 807         case NETDEV_KIND_IP6TNL:
 808                 independent = IP6TNL(netdev)->independent;
 809                 break;
 810         case NETDEV_KIND_ERSPAN:
 811                 independent = ERSPAN(netdev)->independent;
 812                 break;
 813         case NETDEV_KIND_XFRM:
 814                 independent = XFRM(netdev)->independent;
 815                 break;
 816         default:
 817                 break;
 818         }
 819
 820         if (independent) {
 821                 r = netdev_create(netdev, NULL, NULL);
 822                 if (r < 0)
 823                         return r;
 824         }
 825
 826         netdev = NULL;
 827
 828         return 0;
 829 }
 830
 831 int netdev_load(Manager *manager) {
 832         _cleanup_strv_free_ char **files = NULL;
 833         char **f;
 834         int r;
 835
 836         assert(manager);
 837
 838         hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 839
 840         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 841         if (r < 0)
 842                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 843
 844         STRV_FOREACH(f, files) {
 845                 r = netdev_load_one(manager, *f);
 846                 if (r < 0)
 847                         log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
 848         }
 849
 850         return 0;
 851 }