src/network/netdev/netdev.c

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