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