src/network/netdev/netdev.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <net/if.h>
   4 #include <netinet/in.h>
   5 #include <unistd.h>
   6
   7 #include "alloc-util.h"
   8 #include "bareudp.h"
   9 #include "bond.h"
  10 #include "bridge.h"
  11 #include "conf-files.h"
  12 #include "conf-parser.h"
  13 #include "dummy.h"
  14 #include "fd-util.h"
  15 #include "fou-tunnel.h"
  16 #include "geneve.h"
  17 #include "ifb.h"
  18 #include "ipvlan.h"
  19 #include "l2tp-tunnel.h"
  20 #include "list.h"
  21 #include "macsec.h"
  22 #include "macvlan.h"
  23 #include "netdev.h"
  24 #include "netdevsim.h"
  25 #include "netlink-util.h"
  26 #include "networkd-manager.h"
  27 #include "nlmon.h"
  28 #include "path-lookup.h"
  29 #include "siphash24.h"
  30 #include "stat-util.h"
  31 #include "string-table.h"
  32 #include "string-util.h"
  33 #include "strv.h"
  34 #include "tunnel.h"
  35 #include "tuntap.h"
  36 #include "vcan.h"
  37 #include "veth.h"
  38 #include "vlan.h"
  39 #include "vrf.h"
  40 #include "vxcan.h"
  41 #include "vxlan.h"
  42 #include "wireguard.h"
  43 #include "xfrm.h"
  44
  45 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  46         [NETDEV_KIND_BRIDGE] = &bridge_vtable,
  47         [NETDEV_KIND_BOND] = &bond_vtable,
  48         [NETDEV_KIND_VLAN] = &vlan_vtable,
  49         [NETDEV_KIND_MACVLAN] = &macvlan_vtable,
  50         [NETDEV_KIND_MACVTAP] = &macvtap_vtable,
  51         [NETDEV_KIND_IPVLAN] = &ipvlan_vtable,
  52         [NETDEV_KIND_IPVTAP] = &ipvtap_vtable,
  53         [NETDEV_KIND_VXLAN] = &vxlan_vtable,
  54         [NETDEV_KIND_IPIP] = &ipip_vtable,
  55         [NETDEV_KIND_GRE] = &gre_vtable,
  56         [NETDEV_KIND_GRETAP] = &gretap_vtable,
  57         [NETDEV_KIND_IP6GRE] = &ip6gre_vtable,
  58         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  59         [NETDEV_KIND_SIT] = &sit_vtable,
  60         [NETDEV_KIND_VTI] = &vti_vtable,
  61         [NETDEV_KIND_VTI6] = &vti6_vtable,
  62         [NETDEV_KIND_VETH] = &veth_vtable,
  63         [NETDEV_KIND_DUMMY] = &dummy_vtable,
  64         [NETDEV_KIND_TUN] = &tun_vtable,
  65         [NETDEV_KIND_TAP] = &tap_vtable,
  66         [NETDEV_KIND_IP6TNL] = &ip6tnl_vtable,
  67         [NETDEV_KIND_VRF] = &vrf_vtable,
  68         [NETDEV_KIND_VCAN] = &vcan_vtable,
  69         [NETDEV_KIND_GENEVE] = &geneve_vtable,
  70         [NETDEV_KIND_VXCAN] = &vxcan_vtable,
  71         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  72         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  73         [NETDEV_KIND_FOU] = &foutnl_vtable,
  74         [NETDEV_KIND_ERSPAN] = &erspan_vtable,
  75         [NETDEV_KIND_L2TP] = &l2tptnl_vtable,
  76         [NETDEV_KIND_MACSEC] = &macsec_vtable,
  77         [NETDEV_KIND_NLMON] = &nlmon_vtable,
  78         [NETDEV_KIND_XFRM] = &xfrm_vtable,
  79         [NETDEV_KIND_IFB] = &ifb_vtable,
  80         [NETDEV_KIND_BAREUDP] = &bare_udp_vtable,
  81 };
  82
  83 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  84         [NETDEV_KIND_BAREUDP] = "bareudp",
  85         [NETDEV_KIND_BRIDGE] = "bridge",
  86         [NETDEV_KIND_BOND] = "bond",
  87         [NETDEV_KIND_VLAN] = "vlan",
  88         [NETDEV_KIND_MACVLAN] = "macvlan",
  89         [NETDEV_KIND_MACVTAP] = "macvtap",
  90         [NETDEV_KIND_IPVLAN] = "ipvlan",
  91         [NETDEV_KIND_IPVTAP] = "ipvtap",
  92         [NETDEV_KIND_VXLAN] = "vxlan",
  93         [NETDEV_KIND_IPIP] = "ipip",
  94         [NETDEV_KIND_GRE] = "gre",
  95         [NETDEV_KIND_GRETAP] = "gretap",
  96         [NETDEV_KIND_IP6GRE] = "ip6gre",
  97         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
  98         [NETDEV_KIND_SIT] = "sit",
  99         [NETDEV_KIND_VETH] = "veth",
 100         [NETDEV_KIND_VTI] = "vti",
 101         [NETDEV_KIND_VTI6] = "vti6",
 102         [NETDEV_KIND_DUMMY] = "dummy",
 103         [NETDEV_KIND_TUN] = "tun",
 104         [NETDEV_KIND_TAP] = "tap",
 105         [NETDEV_KIND_IP6TNL] = "ip6tnl",
 106         [NETDEV_KIND_VRF] = "vrf",
 107         [NETDEV_KIND_VCAN] = "vcan",
 108         [NETDEV_KIND_GENEVE] = "geneve",
 109         [NETDEV_KIND_VXCAN] = "vxcan",
 110         [NETDEV_KIND_WIREGUARD] = "wireguard",
 111         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 112         [NETDEV_KIND_FOU] = "fou",
 113         [NETDEV_KIND_ERSPAN] = "erspan",
 114         [NETDEV_KIND_L2TP] = "l2tp",
 115         [NETDEV_KIND_MACSEC] = "macsec",
 116         [NETDEV_KIND_NLMON] = "nlmon",
 117         [NETDEV_KIND_XFRM] = "xfrm",
 118         [NETDEV_KIND_IFB] = "ifb",
 119 };
 120
 121 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 122
 123 int config_parse_netdev_kind(
 124                 const char *unit,
 125                 const char *filename,
 126                 unsigned line,
 127                 const char *section,
 128                 unsigned section_line,
 129                 const char *lvalue,
 130                 int ltype,
 131                 const char *rvalue,
 132                 void *data,
 133                 void *userdata) {
 134
 135         NetDevKind k, *kind = data;
 136
 137         assert(rvalue);
 138         assert(data);
 139
 140         k = netdev_kind_from_string(rvalue);
 141         if (k < 0) {
 142                 log_syntax(unit, LOG_WARNING, filename, line, 0, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 143                 return 0;
 144         }
 145
 146         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 147                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 148                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 149                            netdev_kind_to_string(*kind), rvalue);
 150                 return 0;
 151         }
 152
 153         *kind = k;
 154
 155         return 0;
 156 }
 157
 158 static void netdev_callbacks_clear(NetDev *netdev) {
 159         netdev_join_callback *callback;
 160
 161         if (!netdev)
 162                 return;
 163
 164         while ((callback = netdev->callbacks)) {
 165                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 166                 link_unref(callback->link);
 167                 free(callback);
 168         }
 169 }
 170
 171 bool netdev_is_managed(NetDev *netdev) {
 172         if (!netdev || !netdev->manager || !netdev->ifname)
 173                 return false;
 174
 175         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 176 }
 177
 178 static void netdev_detach_from_manager(NetDev *netdev) {
 179         if (netdev->ifname && netdev->manager)
 180                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 181 }
 182
 183 static NetDev *netdev_free(NetDev *netdev) {
 184         assert(netdev);
 185
 186         netdev_callbacks_clear(netdev);
 187
 188         netdev_detach_from_manager(netdev);
 189
 190         free(netdev->filename);
 191
 192         free(netdev->description);
 193         free(netdev->ifname);
 194         free(netdev->mac);
 195         condition_free_list(netdev->conditions);
 196
 197         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 198          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 199          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 200          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 201          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 202          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 203          * call. */
 204         if (netdev->state != _NETDEV_STATE_INVALID &&
 205             NETDEV_VTABLE(netdev) &&
 206             NETDEV_VTABLE(netdev)->done)
 207                 NETDEV_VTABLE(netdev)->done(netdev);
 208
 209         return mfree(netdev);
 210 }
 211
 212 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 213
 214 void netdev_drop(NetDev *netdev) {
 215         if (!netdev || netdev->state == NETDEV_STATE_LINGER)
 216                 return;
 217
 218         netdev->state = NETDEV_STATE_LINGER;
 219
 220         log_netdev_debug(netdev, "netdev removed");
 221
 222         netdev_callbacks_clear(netdev);
 223
 224         netdev_detach_from_manager(netdev);
 225
 226         netdev_unref(netdev);
 227
 228         return;
 229 }
 230
 231 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 232         NetDev *netdev;
 233
 234         assert(manager);
 235         assert(name);
 236         assert(ret);
 237
 238         netdev = hashmap_get(manager->netdevs, name);
 239         if (!netdev) {
 240                 *ret = NULL;
 241                 return -ENOENT;
 242         }
 243
 244         *ret = netdev;
 245
 246         return 0;
 247 }
 248
 249 static int netdev_enter_failed(NetDev *netdev) {
 250         netdev->state = NETDEV_STATE_FAILED;
 251
 252         netdev_callbacks_clear(netdev);
 253
 254         return 0;
 255 }
 256
 257 static int netdev_enslave_ready(NetDev *netdev, Link* link, link_netlink_message_handler_t callback) {
 258         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
 259         int r;
 260
 261         assert(netdev);
 262         assert(netdev->state == NETDEV_STATE_READY);
 263         assert(netdev->manager);
 264         assert(netdev->manager->rtnl);
 265         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 266         assert(link);
 267         assert(callback);
 268
 269         if (link->flags & IFF_UP && netdev->kind == NETDEV_KIND_BOND) {
 270                 log_netdev_debug(netdev, "Link '%s' was up when attempting to enslave it. Bringing link down.", link->ifname);
 271                 r = link_down(link, NULL);
 272                 if (r < 0)
 273                         return log_netdev_error_errno(netdev, r, "Could not bring link down: %m");
 274         }
 275
 276         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &req, RTM_SETLINK, link->ifindex);
 277         if (r < 0)
 278                 return log_netdev_error_errno(netdev, r, "Could not allocate RTM_SETLINK message: %m");
 279
 280         r = sd_netlink_message_append_u32(req, IFLA_MASTER, netdev->ifindex);
 281         if (r < 0)
 282                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MASTER attribute: %m");
 283
 284         r = netlink_call_async(netdev->manager->rtnl, NULL, req, callback,
 285                                link_netlink_destroy_callback, link);
 286         if (r < 0)
 287                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 288
 289         link_ref(link);
 290
 291         log_netdev_debug(netdev, "Enslaving link '%s'", link->ifname);
 292
 293         return 0;
 294 }
 295
 296 static int netdev_enter_ready(NetDev *netdev) {
 297         netdev_join_callback *callback, *callback_next;
 298         int r;
 299
 300         assert(netdev);
 301         assert(netdev->ifname);
 302
 303         if (netdev->state != NETDEV_STATE_CREATING)
 304                 return 0;
 305
 306         netdev->state = NETDEV_STATE_READY;
 307
 308         log_netdev_info(netdev, "netdev ready");
 309
 310         LIST_FOREACH_SAFE(callbacks, callback, callback_next, netdev->callbacks) {
 311                 /* enslave the links that were attempted to be enslaved before the
 312                  * link was ready */
 313                 r = netdev_enslave_ready(netdev, callback->link, callback->callback);
 314                 if (r < 0)
 315                         return r;
 316
 317                 LIST_REMOVE(callbacks, netdev->callbacks, callback);
 318                 link_unref(callback->link);
 319                 free(callback);
 320         }
 321
 322         if (NETDEV_VTABLE(netdev)->post_create)
 323                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 324
 325         return 0;
 326 }
 327
 328 /* callback for netdev's created without a backing Link */
 329 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 330         int r;
 331
 332         assert(netdev);
 333         assert(netdev->state != _NETDEV_STATE_INVALID);
 334
 335         r = sd_netlink_message_get_errno(m);
 336         if (r == -EEXIST)
 337                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 338         else if (r < 0) {
 339                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 340                 netdev_drop(netdev);
 341
 342                 return 1;
 343         }
 344
 345         log_netdev_debug(netdev, "Created");
 346
 347         return 1;
 348 }
 349
 350 static int netdev_enslave(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 351         int r;
 352
 353         assert(netdev);
 354         assert(netdev->manager);
 355         assert(netdev->manager->rtnl);
 356         assert(IN_SET(netdev->kind, NETDEV_KIND_BRIDGE, NETDEV_KIND_BOND, NETDEV_KIND_VRF));
 357
 358         if (netdev->state == NETDEV_STATE_READY) {
 359                 r = netdev_enslave_ready(netdev, link, callback);
 360                 if (r < 0)
 361                         return r;
 362         } else if (IN_SET(netdev->state, NETDEV_STATE_LINGER, NETDEV_STATE_FAILED)) {
 363                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 364
 365                 r = rtnl_message_new_synthetic_error(netdev->manager->rtnl, -ENODEV, 0, &m);
 366                 if (r >= 0)
 367                         callback(netdev->manager->rtnl, m, link);
 368         } else {
 369                 /* the netdev is not yet ready, save this request for when it is */
 370                 netdev_join_callback *cb;
 371
 372                 cb = new(netdev_join_callback, 1);
 373                 if (!cb)
 374                         return log_oom();
 375
 376                 *cb = (netdev_join_callback) {
 377                         .callback = callback,
 378                         .link = link_ref(link),
 379                 };
 380
 381                 LIST_PREPEND(callbacks, netdev->callbacks, cb);
 382
 383                 log_netdev_debug(netdev, "Will enslave '%s', when ready", link->ifname);
 384         }
 385
 386         return 0;
 387 }
 388
 389 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 390         uint16_t type;
 391         const char *kind;
 392         const char *received_kind;
 393         const char *received_name;
 394         int r, ifindex;
 395
 396         assert(netdev);
 397         assert(message);
 398
 399         r = sd_netlink_message_get_type(message, &type);
 400         if (r < 0)
 401                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 402
 403         if (type != RTM_NEWLINK)
 404                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
 405
 406         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 407         if (r < 0) {
 408                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 409                 netdev_enter_failed(netdev);
 410                 return r;
 411         } else if (ifindex <= 0) {
 412                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 413                 netdev_enter_failed(netdev);
 414                 return -EINVAL;
 415         }
 416
 417         if (netdev->ifindex > 0) {
 418                 if (netdev->ifindex != ifindex) {
 419                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 420                                          ifindex, netdev->ifindex);
 421                         netdev_enter_failed(netdev);
 422                         return -EEXIST;
 423                 } else
 424                         /* ifindex already set to the same for this netdev */
 425                         return 0;
 426         }
 427
 428         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 429         if (r < 0)
 430                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 431
 432         if (!streq(netdev->ifname, received_name)) {
 433                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 434                 netdev_enter_failed(netdev);
 435                 return -EINVAL;
 436         }
 437
 438         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 439         if (r < 0)
 440                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 441
 442         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 443         if (r < 0)
 444                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 445
 446         r = sd_netlink_message_exit_container(message);
 447         if (r < 0)
 448                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 449
 450         if (netdev->kind == NETDEV_KIND_TAP)
 451                 /* the kernel does not distinguish between tun and tap */
 452                 kind = "tun";
 453         else {
 454                 kind = netdev_kind_to_string(netdev->kind);
 455                 if (!kind) {
 456                         log_netdev_error(netdev, "Could not get kind");
 457                         netdev_enter_failed(netdev);
 458                         return -EINVAL;
 459                 }
 460         }
 461
 462         if (!streq(kind, received_kind)) {
 463                 log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
 464                                  received_kind, kind);
 465                 netdev_enter_failed(netdev);
 466                 return -EINVAL;
 467         }
 468
 469         netdev->ifindex = ifindex;
 470
 471         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 472
 473         netdev_enter_ready(netdev);
 474
 475         return 0;
 476 }
 477
 478 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 479
 480 int netdev_get_mac(const char *ifname, struct ether_addr **ret) {
 481         _cleanup_free_ struct ether_addr *mac = NULL;
 482         uint64_t result;
 483         size_t l, sz;
 484         uint8_t *v;
 485         int r;
 486
 487         assert(ifname);
 488         assert(ret);
 489
 490         mac = new0(struct ether_addr, 1);
 491         if (!mac)
 492                 return -ENOMEM;
 493
 494         l = strlen(ifname);
 495         sz = sizeof(sd_id128_t) + l;
 496         v = newa(uint8_t, sz);
 497
 498         /* fetch some persistent data unique to the machine */
 499         r = sd_id128_get_machine((sd_id128_t*) v);
 500         if (r < 0)
 501                 return r;
 502
 503         /* combine with some data unique (on this machine) to this
 504          * netdev */
 505         memcpy(v + sizeof(sd_id128_t), ifname, l);
 506
 507         /* Let's hash the host machine ID plus the container name. We
 508          * use a fixed, but originally randomly created hash key here. */
 509         result = siphash24(v, sz, HASH_KEY.bytes);
 510
 511         assert_cc(ETH_ALEN <= sizeof(result));
 512         memcpy(mac->ether_addr_octet, &result, ETH_ALEN);
 513
 514         /* see eth_random_addr in the kernel */
 515         mac->ether_addr_octet[0] &= 0xfe;        /* clear multicast bit */
 516         mac->ether_addr_octet[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 517
 518         *ret = TAKE_PTR(mac);
 519
 520         return 0;
 521 }
 522
 523 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 524         int r;
 525
 526         assert(netdev);
 527         assert(!link || callback);
 528
 529         /* create netdev */
 530         if (NETDEV_VTABLE(netdev)->create) {
 531                 assert(!link);
 532
 533                 r = NETDEV_VTABLE(netdev)->create(netdev);
 534                 if (r < 0)
 535                         return r;
 536
 537                 log_netdev_debug(netdev, "Created");
 538         } else {
 539                 _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 540
 541                 r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 542                 if (r < 0)
 543                         return log_netdev_error_errno(netdev, r, "Could not allocate RTM_NEWLINK message: %m");
 544
 545                 r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 546                 if (r < 0)
 547                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_IFNAME, attribute: %m");
 548
 549                 if (netdev->mac) {
 550                         r = sd_netlink_message_append_ether_addr(m, IFLA_ADDRESS, netdev->mac);
 551                         if (r < 0)
 552                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_ADDRESS attribute: %m");
 553                 }
 554
 555                 if (netdev->mtu != 0) {
 556                         r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 557                         if (r < 0)
 558                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_MTU attribute: %m");
 559                 }
 560
 561                 if (link) {
 562                         r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 563                         if (r < 0)
 564                                 return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINK attribute: %m");
 565                 }
 566
 567                 r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 568                 if (r < 0)
 569                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 570
 571                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 572                 if (r < 0)
 573                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 574
 575                 if (NETDEV_VTABLE(netdev)->fill_message_create) {
 576                         r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 577                         if (r < 0)
 578                                 return r;
 579                 }
 580
 581                 r = sd_netlink_message_close_container(m);
 582                 if (r < 0)
 583                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_INFO_DATA attribute: %m");
 584
 585                 r = sd_netlink_message_close_container(m);
 586                 if (r < 0)
 587                         return log_netdev_error_errno(netdev, r, "Could not append IFLA_LINKINFO attribute: %m");
 588
 589                 if (link) {
 590                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 591                                                link_netlink_destroy_callback, link);
 592                         if (r < 0)
 593                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 594
 595                         link_ref(link);
 596                 } else {
 597                         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 598                                                netdev_destroy_callback, netdev);
 599                         if (r < 0)
 600                                 return log_netdev_error_errno(netdev, r, "Could not send rtnetlink message: %m");
 601
 602                         netdev_ref(netdev);
 603                 }
 604
 605                 netdev->state = NETDEV_STATE_CREATING;
 606
 607                 log_netdev_debug(netdev, "Creating");
 608         }
 609
 610         return 0;
 611 }
 612
 613 static int netdev_create_after_configured(NetDev *netdev, Link *link) {
 614         assert(netdev);
 615         assert(link);
 616         assert(NETDEV_VTABLE(netdev)->create_after_configured);
 617
 618         return NETDEV_VTABLE(netdev)->create_after_configured(netdev, link);
 619 }
 620
 621 /* the callback must be called, possibly after a timeout, as otherwise the Link will hang */
 622 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 623         int r;
 624
 625         assert(netdev);
 626         assert(netdev->manager);
 627         assert(netdev->manager->rtnl);
 628
 629         switch (netdev_get_create_type(netdev)) {
 630         case NETDEV_CREATE_MASTER:
 631                 r = netdev_enslave(netdev, link, callback);
 632                 if (r < 0)
 633                         return r;
 634
 635                 break;
 636         case NETDEV_CREATE_STACKED:
 637                 r = netdev_create(netdev, link, callback);
 638                 if (r < 0)
 639                         return r;
 640
 641                 break;
 642         case NETDEV_CREATE_AFTER_CONFIGURED:
 643                 r = netdev_create_after_configured(netdev, link);
 644                 if (r < 0)
 645                         return r;
 646                 break;
 647         default:
 648                 assert_not_reached("Cannot join independent netdev");
 649         }
 650
 651         return 0;
 652 }
 653
 654 int netdev_load_one(Manager *manager, const char *filename) {
 655         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 656         _cleanup_fclose_ FILE *file = NULL;
 657         const char *dropin_dirname;
 658         bool independent = false;
 659         int r;
 660
 661         assert(manager);
 662         assert(filename);
 663
 664         file = fopen(filename, "re");
 665         if (!file) {
 666                 if (errno == ENOENT)
 667                         return 0;
 668
 669                 return -errno;
 670         }
 671
 672         if (null_or_empty_fd(fileno(file))) {
 673                 log_debug("Skipping empty file: %s", filename);
 674                 return 0;
 675         }
 676
 677         netdev_raw = new(NetDev, 1);
 678         if (!netdev_raw)
 679                 return log_oom();
 680
 681         *netdev_raw = (NetDev) {
 682                 .n_ref = 1,
 683                 .kind = _NETDEV_KIND_INVALID,
 684                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 685         };
 686
 687         dropin_dirname = strjoina(basename(filename), ".d");
 688         r = config_parse_many(
 689                         filename, NETWORK_DIRS, dropin_dirname,
 690                         NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
 691                         config_item_perf_lookup, network_netdev_gperf_lookup,
 692                         CONFIG_PARSE_WARN,
 693                         netdev_raw,
 694                         NULL);
 695         if (r < 0)
 696                 return r;
 697
 698         /* skip out early if configuration does not match the environment */
 699         if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
 700                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 701                 return 0;
 702         }
 703
 704         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 705                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 706                 return 0;
 707         }
 708
 709         if (!netdev_raw->ifname) {
 710                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 711                 return 0;
 712         }
 713
 714         r = fseek(file, 0, SEEK_SET);
 715         if (r < 0)
 716                 return -errno;
 717
 718         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 719         if (!netdev)
 720                 return log_oom();
 721
 722         netdev->n_ref = 1;
 723         netdev->manager = manager;
 724         netdev->kind = netdev_raw->kind;
 725         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 726                                                  so that done() will be called on destruction */
 727
 728         if (NETDEV_VTABLE(netdev)->init)
 729                 NETDEV_VTABLE(netdev)->init(netdev);
 730
 731         r = config_parse_many(
 732                         filename, NETWORK_DIRS, dropin_dirname,
 733                         NETDEV_VTABLE(netdev)->sections,
 734                         config_item_perf_lookup, network_netdev_gperf_lookup,
 735                         CONFIG_PARSE_WARN,
 736                         netdev, NULL);
 737         if (r < 0)
 738                 return r;
 739
 740         /* verify configuration */
 741         if (NETDEV_VTABLE(netdev)->config_verify) {
 742                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 743                 if (r < 0)
 744                         return 0;
 745         }
 746
 747         netdev->filename = strdup(filename);
 748         if (!netdev->filename)
 749                 return log_oom();
 750
 751         if (!netdev->mac && NETDEV_VTABLE(netdev)->generate_mac) {
 752                 r = netdev_get_mac(netdev->ifname, &netdev->mac);
 753                 if (r < 0)
 754                         return log_netdev_error_errno(netdev, r,
 755                                                       "Failed to generate predictable MAC address for %s: %m",
 756                                                       netdev->ifname);
 757         }
 758
 759         r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
 760         if (r == -ENOMEM)
 761                 return log_oom();
 762         if (r == -EEXIST) {
 763                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 764
 765                 assert(n);
 766                 if (!streq(netdev->filename, n->filename))
 767                         log_netdev_warning_errno(netdev, r,
 768                                                  "The setting Name=%s in %s conflicts with the one in %s, ignoring",
 769                                                  netdev->ifname, netdev->filename, n->filename);
 770
 771                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 772                  * removed from the hashmap 'manager->netdevs'. */
 773                 netdev->ifname = mfree(netdev->ifname);
 774                 return 0;
 775         }
 776         if (r < 0)
 777                 return r;
 778
 779         LIST_HEAD_INIT(netdev->callbacks);
 780
 781         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 782
 783         if (IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_MASTER, NETDEV_CREATE_INDEPENDENT)) {
 784                 r = netdev_create(netdev, NULL, NULL);
 785                 if (r < 0)
 786                         return r;
 787         }
 788
 789         switch (netdev->kind) {
 790         case NETDEV_KIND_IPIP:
 791                 independent = IPIP(netdev)->independent;
 792                 break;
 793         case NETDEV_KIND_GRE:
 794                 independent = GRE(netdev)->independent;
 795                 break;
 796         case NETDEV_KIND_GRETAP:
 797                 independent = GRETAP(netdev)->independent;
 798                 break;
 799         case NETDEV_KIND_IP6GRE:
 800                 independent = IP6GRE(netdev)->independent;
 801                 break;
 802         case NETDEV_KIND_IP6GRETAP:
 803                 independent = IP6GRETAP(netdev)->independent;
 804                 break;
 805         case NETDEV_KIND_SIT:
 806                 independent = SIT(netdev)->independent;
 807                 break;
 808         case NETDEV_KIND_VTI:
 809                 independent = VTI(netdev)->independent;
 810                 break;
 811         case NETDEV_KIND_VTI6:
 812                 independent = VTI6(netdev)->independent;
 813                 break;
 814         case NETDEV_KIND_IP6TNL:
 815                 independent = IP6TNL(netdev)->independent;
 816                 break;
 817         case NETDEV_KIND_ERSPAN:
 818                 independent = ERSPAN(netdev)->independent;
 819                 break;
 820         case NETDEV_KIND_XFRM:
 821                 independent = XFRM(netdev)->independent;
 822                 break;
 823         case NETDEV_KIND_VXLAN:
 824                 independent = VXLAN(netdev)->independent;
 825                 break;
 826         default:
 827                 break;
 828         }
 829
 830         if (independent) {
 831                 r = netdev_create(netdev, NULL, NULL);
 832                 if (r < 0)
 833                         return r;
 834         }
 835
 836         netdev = NULL;
 837
 838         return 0;
 839 }
 840
 841 int netdev_load(Manager *manager, bool reload) {
 842         _cleanup_strv_free_ char **files = NULL;
 843         char **f;
 844         int r;
 845
 846         assert(manager);
 847
 848         if (!reload)
 849                 hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 850
 851         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 852         if (r < 0)
 853                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 854
 855         STRV_FOREACH(f, files) {
 856                 r = netdev_load_one(manager, *f);
 857                 if (r < 0)
 858                         log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
 859         }
 860
 861         return 0;
 862 }