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 <linux/if_arp.h>
   6 #include <unistd.h>
   7
   8 #include "alloc-util.h"
   9 #include "arphrd-util.h"
  10 #include "bareudp.h"
  11 #include "batadv.h"
  12 #include "bond.h"
  13 #include "bridge.h"
  14 #include "conf-files.h"
  15 #include "conf-parser.h"
  16 #include "dummy.h"
  17 #include "fd-util.h"
  18 #include "fou-tunnel.h"
  19 #include "geneve.h"
  20 #include "ifb.h"
  21 #include "ipoib.h"
  22 #include "ipvlan.h"
  23 #include "l2tp-tunnel.h"
  24 #include "list.h"
  25 #include "macsec.h"
  26 #include "macvlan.h"
  27 #include "netdev.h"
  28 #include "netdevsim.h"
  29 #include "netif-util.h"
  30 #include "netlink-util.h"
  31 #include "networkd-manager.h"
  32 #include "networkd-queue.h"
  33 #include "networkd-setlink.h"
  34 #include "nlmon.h"
  35 #include "path-lookup.h"
  36 #include "siphash24.h"
  37 #include "stat-util.h"
  38 #include "string-table.h"
  39 #include "string-util.h"
  40 #include "strv.h"
  41 #include "tunnel.h"
  42 #include "tuntap.h"
  43 #include "vcan.h"
  44 #include "veth.h"
  45 #include "vlan.h"
  46 #include "vrf.h"
  47 #include "vxcan.h"
  48 #include "vxlan.h"
  49 #include "wireguard.h"
  50 #include "wlan.h"
  51 #include "xfrm.h"
  52
  53 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  54         [NETDEV_KIND_BAREUDP]   = &bare_udp_vtable,
  55         [NETDEV_KIND_BATADV]    = &batadv_vtable,
  56         [NETDEV_KIND_BOND]      = &bond_vtable,
  57         [NETDEV_KIND_BRIDGE]    = &bridge_vtable,
  58         [NETDEV_KIND_DUMMY]     = &dummy_vtable,
  59         [NETDEV_KIND_ERSPAN]    = &erspan_vtable,
  60         [NETDEV_KIND_FOU]       = &foutnl_vtable,
  61         [NETDEV_KIND_GENEVE]    = &geneve_vtable,
  62         [NETDEV_KIND_GRE]       = &gre_vtable,
  63         [NETDEV_KIND_GRETAP]    = &gretap_vtable,
  64         [NETDEV_KIND_IFB]       = &ifb_vtable,
  65         [NETDEV_KIND_IP6GRE]    = &ip6gre_vtable,
  66         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  67         [NETDEV_KIND_IP6TNL]    = &ip6tnl_vtable,
  68         [NETDEV_KIND_IPIP]      = &ipip_vtable,
  69         [NETDEV_KIND_IPOIB]     = &ipoib_vtable,
  70         [NETDEV_KIND_IPVLAN]    = &ipvlan_vtable,
  71         [NETDEV_KIND_IPVTAP]    = &ipvtap_vtable,
  72         [NETDEV_KIND_L2TP]      = &l2tptnl_vtable,
  73         [NETDEV_KIND_MACSEC]    = &macsec_vtable,
  74         [NETDEV_KIND_MACVLAN]   = &macvlan_vtable,
  75         [NETDEV_KIND_MACVTAP]   = &macvtap_vtable,
  76         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  77         [NETDEV_KIND_NLMON]     = &nlmon_vtable,
  78         [NETDEV_KIND_SIT]       = &sit_vtable,
  79         [NETDEV_KIND_TAP]       = &tap_vtable,
  80         [NETDEV_KIND_TUN]       = &tun_vtable,
  81         [NETDEV_KIND_VCAN]      = &vcan_vtable,
  82         [NETDEV_KIND_VETH]      = &veth_vtable,
  83         [NETDEV_KIND_VLAN]      = &vlan_vtable,
  84         [NETDEV_KIND_VRF]       = &vrf_vtable,
  85         [NETDEV_KIND_VTI6]      = &vti6_vtable,
  86         [NETDEV_KIND_VTI]       = &vti_vtable,
  87         [NETDEV_KIND_VXCAN]     = &vxcan_vtable,
  88         [NETDEV_KIND_VXLAN]     = &vxlan_vtable,
  89         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  90         [NETDEV_KIND_WLAN]      = &wlan_vtable,
  91         [NETDEV_KIND_XFRM]      = &xfrm_vtable,
  92 };
  93
  94 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  95         [NETDEV_KIND_BAREUDP]   = "bareudp",
  96         [NETDEV_KIND_BATADV]    = "batadv",
  97         [NETDEV_KIND_BOND]      = "bond",
  98         [NETDEV_KIND_BRIDGE]    = "bridge",
  99         [NETDEV_KIND_DUMMY]     = "dummy",
 100         [NETDEV_KIND_ERSPAN]    = "erspan",
 101         [NETDEV_KIND_FOU]       = "fou",
 102         [NETDEV_KIND_GENEVE]    = "geneve",
 103         [NETDEV_KIND_GRE]       = "gre",
 104         [NETDEV_KIND_GRETAP]    = "gretap",
 105         [NETDEV_KIND_IFB]       = "ifb",
 106         [NETDEV_KIND_IP6GRE]    = "ip6gre",
 107         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
 108         [NETDEV_KIND_IP6TNL]    = "ip6tnl",
 109         [NETDEV_KIND_IPIP]      = "ipip",
 110         [NETDEV_KIND_IPOIB]     = "ipoib",
 111         [NETDEV_KIND_IPVLAN]    = "ipvlan",
 112         [NETDEV_KIND_IPVTAP]    = "ipvtap",
 113         [NETDEV_KIND_L2TP]      = "l2tp",
 114         [NETDEV_KIND_MACSEC]    = "macsec",
 115         [NETDEV_KIND_MACVLAN]   = "macvlan",
 116         [NETDEV_KIND_MACVTAP]   = "macvtap",
 117         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 118         [NETDEV_KIND_NLMON]     = "nlmon",
 119         [NETDEV_KIND_SIT]       = "sit",
 120         [NETDEV_KIND_TAP]       = "tap",
 121         [NETDEV_KIND_TUN]       = "tun",
 122         [NETDEV_KIND_VCAN]      = "vcan",
 123         [NETDEV_KIND_VETH]      = "veth",
 124         [NETDEV_KIND_VLAN]      = "vlan",
 125         [NETDEV_KIND_VRF]       = "vrf",
 126         [NETDEV_KIND_VTI6]      = "vti6",
 127         [NETDEV_KIND_VTI]       = "vti",
 128         [NETDEV_KIND_VXCAN]     = "vxcan",
 129         [NETDEV_KIND_VXLAN]     = "vxlan",
 130         [NETDEV_KIND_WIREGUARD] = "wireguard",
 131         [NETDEV_KIND_WLAN]      = "virtual-wlan",
 132         [NETDEV_KIND_XFRM]      = "xfrm",
 133 };
 134
 135 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 136
 137 bool netdev_is_managed(NetDev *netdev) {
 138         if (!netdev || !netdev->manager || !netdev->ifname)
 139                 return false;
 140
 141         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 142 }
 143
 144 static bool netdev_is_stacked_and_independent(NetDev *netdev) {
 145         assert(netdev);
 146
 147         if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
 148                 return false;
 149
 150         switch (netdev->kind) {
 151         case NETDEV_KIND_ERSPAN:
 152                 return ERSPAN(netdev)->independent;
 153         case NETDEV_KIND_GRE:
 154                 return GRE(netdev)->independent;
 155         case NETDEV_KIND_GRETAP:
 156                 return GRETAP(netdev)->independent;
 157         case NETDEV_KIND_IP6GRE:
 158                 return IP6GRE(netdev)->independent;
 159         case NETDEV_KIND_IP6GRETAP:
 160                 return IP6GRETAP(netdev)->independent;
 161         case NETDEV_KIND_IP6TNL:
 162                 return IP6TNL(netdev)->independent;
 163         case NETDEV_KIND_IPIP:
 164                 return IPIP(netdev)->independent;
 165         case NETDEV_KIND_SIT:
 166                 return SIT(netdev)->independent;
 167         case NETDEV_KIND_VTI:
 168                 return VTI(netdev)->independent;
 169         case NETDEV_KIND_VTI6:
 170                 return VTI6(netdev)->independent;
 171         case NETDEV_KIND_VXLAN:
 172                 return VXLAN(netdev)->independent;
 173         case NETDEV_KIND_XFRM:
 174                 return XFRM(netdev)->independent;
 175         default:
 176                 return false;
 177         }
 178 }
 179
 180 static bool netdev_is_stacked(NetDev *netdev) {
 181         assert(netdev);
 182
 183         if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
 184                 return false;
 185
 186         if (netdev_is_stacked_and_independent(netdev))
 187                 return false;
 188
 189         return true;
 190 }
 191
 192 static void netdev_detach_from_manager(NetDev *netdev) {
 193         if (netdev->ifname && netdev->manager)
 194                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 195 }
 196
 197 static NetDev *netdev_free(NetDev *netdev) {
 198         assert(netdev);
 199
 200         netdev_detach_from_manager(netdev);
 201
 202         free(netdev->filename);
 203
 204         free(netdev->description);
 205         free(netdev->ifname);
 206         condition_free_list(netdev->conditions);
 207
 208         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 209          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 210          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 211          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 212          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 213          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 214          * call. */
 215         if (netdev->state != _NETDEV_STATE_INVALID &&
 216             NETDEV_VTABLE(netdev) &&
 217             NETDEV_VTABLE(netdev)->done)
 218                 NETDEV_VTABLE(netdev)->done(netdev);
 219
 220         return mfree(netdev);
 221 }
 222
 223 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 224
 225 void netdev_drop(NetDev *netdev) {
 226         if (!netdev)
 227                 return;
 228
 229         if (netdev_is_stacked(netdev)) {
 230                 /* The netdev may be removed due to the underlying device removal, and the device may
 231                  * be re-added later. */
 232                 netdev->state = NETDEV_STATE_LOADING;
 233                 netdev->ifindex = 0;
 234
 235                 log_netdev_debug(netdev, "netdev removed");
 236                 return;
 237         }
 238
 239         netdev->state = NETDEV_STATE_LINGER;
 240
 241         log_netdev_debug(netdev, "netdev removed");
 242
 243         netdev_detach_from_manager(netdev);
 244         netdev_unref(netdev);
 245         return;
 246 }
 247
 248 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 249         NetDev *netdev;
 250
 251         assert(manager);
 252         assert(name);
 253         assert(ret);
 254
 255         netdev = hashmap_get(manager->netdevs, name);
 256         if (!netdev)
 257                 return -ENOENT;
 258
 259         *ret = netdev;
 260
 261         return 0;
 262 }
 263
 264 void netdev_enter_failed(NetDev *netdev) {
 265         netdev->state = NETDEV_STATE_FAILED;
 266 }
 267
 268 static int netdev_enter_ready(NetDev *netdev) {
 269         assert(netdev);
 270         assert(netdev->ifname);
 271
 272         if (netdev->state != NETDEV_STATE_CREATING)
 273                 return 0;
 274
 275         netdev->state = NETDEV_STATE_READY;
 276
 277         log_netdev_info(netdev, "netdev ready");
 278
 279         if (NETDEV_VTABLE(netdev)->post_create)
 280                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL);
 281
 282         return 0;
 283 }
 284
 285 /* callback for netdev's created without a backing Link */
 286 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 287         int r;
 288
 289         assert(netdev);
 290         assert(netdev->state != _NETDEV_STATE_INVALID);
 291
 292         r = sd_netlink_message_get_errno(m);
 293         if (r == -EEXIST)
 294                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 295         else if (r < 0) {
 296                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 297                 netdev_enter_failed(netdev);
 298
 299                 return 1;
 300         }
 301
 302         log_netdev_debug(netdev, "Created");
 303
 304         return 1;
 305 }
 306
 307 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 308         uint16_t type;
 309         const char *kind;
 310         const char *received_kind;
 311         const char *received_name;
 312         int r, ifindex;
 313
 314         assert(netdev);
 315         assert(message);
 316
 317         r = sd_netlink_message_get_type(message, &type);
 318         if (r < 0)
 319                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 320
 321         if (type != RTM_NEWLINK)
 322                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
 323
 324         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 325         if (r < 0) {
 326                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 327                 netdev_enter_failed(netdev);
 328                 return r;
 329         } else if (ifindex <= 0) {
 330                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 331                 netdev_enter_failed(netdev);
 332                 return -EINVAL;
 333         }
 334
 335         if (netdev->ifindex > 0) {
 336                 if (netdev->ifindex != ifindex) {
 337                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 338                                          ifindex, netdev->ifindex);
 339                         netdev_enter_failed(netdev);
 340                         return -EEXIST;
 341                 } else
 342                         /* ifindex already set to the same for this netdev */
 343                         return 0;
 344         }
 345
 346         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 347         if (r < 0)
 348                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 349
 350         if (!streq(netdev->ifname, received_name)) {
 351                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 352                 netdev_enter_failed(netdev);
 353                 return -EINVAL;
 354         }
 355
 356         if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
 357
 358                 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 359                 if (r < 0)
 360                         return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 361
 362                 r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 363                 if (r < 0)
 364                         return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 365
 366                 r = sd_netlink_message_exit_container(message);
 367                 if (r < 0)
 368                         return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 369
 370                 if (netdev->kind == NETDEV_KIND_TAP)
 371                         /* the kernel does not distinguish between tun and tap */
 372                         kind = "tun";
 373                 else {
 374                         kind = netdev_kind_to_string(netdev->kind);
 375                         if (!kind) {
 376                                 log_netdev_error(netdev, "Could not get kind");
 377                                 netdev_enter_failed(netdev);
 378                                 return -EINVAL;
 379                         }
 380                 }
 381
 382                 if (!streq(kind, received_kind)) {
 383                         log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
 384                                          received_kind, kind);
 385                         netdev_enter_failed(netdev);
 386                         return -EINVAL;
 387                 }
 388         }
 389
 390         netdev->ifindex = ifindex;
 391
 392         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 393
 394         netdev_enter_ready(netdev);
 395
 396         return 0;
 397 }
 398
 399 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 400
 401 int netdev_generate_hw_addr(
 402                 NetDev *netdev,
 403                 Link *parent,
 404                 const char *name,
 405                 const struct hw_addr_data *hw_addr,
 406                 struct hw_addr_data *ret) {
 407
 408         struct hw_addr_data a = HW_ADDR_NULL;
 409         bool is_static = false;
 410         int r;
 411
 412         assert(netdev);
 413         assert(name);
 414         assert(hw_addr);
 415         assert(ret);
 416
 417         if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
 418                 *ret = HW_ADDR_NULL;
 419                 return 0;
 420         }
 421
 422         if (hw_addr->length == 0) {
 423                 uint64_t result;
 424
 425                 /* HardwareAddress= is not specified. */
 426
 427                 if (!NETDEV_VTABLE(netdev)->generate_mac)
 428                         goto finalize;
 429
 430                 if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
 431                         goto finalize;
 432
 433                 r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
 434                 if (r < 0) {
 435                         log_netdev_warning_errno(netdev, r,
 436                                                  "Failed to generate persistent MAC address, ignoring: %m");
 437                         goto finalize;
 438                 }
 439
 440                 a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
 441
 442                 switch (NETDEV_VTABLE(netdev)->iftype) {
 443                 case ARPHRD_ETHER:
 444                         assert(a.length <= sizeof(result));
 445                         memcpy(a.bytes, &result, a.length);
 446
 447                         if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
 448                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 449                                                          "Failed to generate persistent MAC address, ignoring: %m");
 450                                 a = HW_ADDR_NULL;
 451                                 goto finalize;
 452                         }
 453
 454                         break;
 455                 case ARPHRD_INFINIBAND:
 456                         if (result == 0) {
 457                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 458                                                          "Failed to generate persistent MAC address: %m");
 459                                 goto finalize;
 460                         }
 461
 462                         assert(a.length >= sizeof(result));
 463                         memzero(a.bytes, a.length - sizeof(result));
 464                         memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
 465                         break;
 466                 default:
 467                         assert_not_reached();
 468                 }
 469
 470         } else {
 471                 a = *hw_addr;
 472                 is_static = true;
 473         }
 474
 475         r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
 476                                         parent ? &parent->hw_addr : NULL, &a);
 477         if (r < 0)
 478                 return r;
 479
 480 finalize:
 481         *ret = a;
 482         return 0;
 483 }
 484
 485 static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
 486         int r;
 487
 488         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 489         if (r < 0)
 490                 return r;
 491
 492         struct hw_addr_data hw_addr;
 493         r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
 494         if (r < 0)
 495                 return r;
 496
 497         if (hw_addr.length > 0) {
 498                 log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
 499                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
 500                 if (r < 0)
 501                         return r;
 502         }
 503
 504         if (netdev->mtu != 0) {
 505                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 506                 if (r < 0)
 507                         return r;
 508         }
 509
 510         if (link) {
 511                 r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 512                 if (r < 0)
 513                         return r;
 514         }
 515
 516         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 517         if (r < 0)
 518                 return r;
 519
 520         if (NETDEV_VTABLE(netdev)->fill_message_create) {
 521                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 522                 if (r < 0)
 523                         return r;
 524
 525                 r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 526                 if (r < 0)
 527                         return r;
 528
 529                 r = sd_netlink_message_close_container(m);
 530                 if (r < 0)
 531                         return r;
 532         } else {
 533                 r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
 534                 if (r < 0)
 535                         return r;
 536         }
 537
 538         r = sd_netlink_message_close_container(m);
 539         if (r < 0)
 540                 return r;
 541
 542         return 0;
 543 }
 544
 545 static int independent_netdev_create(NetDev *netdev) {
 546         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 547         int r;
 548
 549         assert(netdev);
 550
 551         /* create netdev */
 552         if (NETDEV_VTABLE(netdev)->create) {
 553                 r = NETDEV_VTABLE(netdev)->create(netdev);
 554                 if (r < 0)
 555                         return r;
 556
 557                 log_netdev_debug(netdev, "Created");
 558                 return 0;
 559         }
 560
 561         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 562         if (r < 0)
 563                 return r;
 564
 565         r = netdev_create_message(netdev, NULL, m);
 566         if (r < 0)
 567                 return r;
 568
 569         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 570                                netdev_destroy_callback, netdev);
 571         if (r < 0)
 572                 return r;
 573
 574         netdev_ref(netdev);
 575
 576         netdev->state = NETDEV_STATE_CREATING;
 577         log_netdev_debug(netdev, "Creating");
 578         return 0;
 579 }
 580
 581 static int stacked_netdev_create(NetDev *netdev, Link *link, Request *req) {
 582         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 583         int r;
 584
 585         assert(netdev);
 586         assert(netdev->manager);
 587         assert(link);
 588         assert(req);
 589
 590         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 591         if (r < 0)
 592                 return r;
 593
 594         r = netdev_create_message(netdev, link, m);
 595         if (r < 0)
 596                 return r;
 597
 598         r = request_call_netlink_async(netdev->manager->rtnl, m, req);
 599         if (r < 0)
 600                 return r;
 601
 602         netdev->state = NETDEV_STATE_CREATING;
 603         log_netdev_debug(netdev, "Creating");
 604         return 0;
 605 }
 606
 607 static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
 608         assert(netdev);
 609
 610         if (netdev->state != NETDEV_STATE_LOADING)
 611                 return false;
 612
 613         if (link) {
 614                 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 615                         return false;
 616
 617                 if (link->set_link_messages > 0)
 618                         return false;
 619
 620                 /* If stacked netdevs are created before the underlying interface being activated, then
 621                  * the activation policy for the netdevs are ignored. See issue #22593. */
 622                 if (!link->activated)
 623                         return false;
 624         }
 625
 626         if (NETDEV_VTABLE(netdev)->is_ready_to_create)
 627                 return NETDEV_VTABLE(netdev)->is_ready_to_create(netdev, link);
 628
 629         return true;
 630 }
 631
 632 int stacked_netdev_process_request(Request *req, Link *link, void *userdata) {
 633         NetDev *netdev = ASSERT_PTR(userdata);
 634         int r;
 635
 636         assert(req);
 637         assert(link);
 638
 639         r = netdev_is_ready_to_create(netdev, link);
 640         if (r <= 0)
 641                 return r;
 642
 643         r = stacked_netdev_create(netdev, link, req);
 644         if (r < 0)
 645                 return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 646
 647         return 1;
 648 }
 649
 650 static int create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
 651         int r;
 652
 653         assert(m);
 654         assert(link);
 655
 656         r = sd_netlink_message_get_errno(m);
 657         if (r < 0 && r != -EEXIST) {
 658                 log_link_message_warning_errno(link, m, r, "Could not create stacked netdev");
 659                 link_enter_failed(link);
 660                 return 0;
 661         }
 662
 663         if (link->create_stacked_netdev_messages == 0) {
 664                 link->stacked_netdevs_created = true;
 665                 log_link_debug(link, "Stacked netdevs created.");
 666                 link_check_ready(link);
 667         }
 668
 669         return 0;
 670 }
 671
 672 int link_request_stacked_netdev(Link *link, NetDev *netdev) {
 673         int r;
 674
 675         assert(link);
 676         assert(netdev);
 677
 678         if (!netdev_is_stacked(netdev))
 679                 return -EINVAL;
 680
 681         if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_FAILED) || netdev->ifindex > 0)
 682                 return 0; /* Already created. */
 683
 684         link->stacked_netdevs_created = false;
 685         r = link_queue_request(link, REQUEST_TYPE_NETDEV_STACKED, netdev_ref(netdev), true,
 686                                &link->create_stacked_netdev_messages,
 687                                create_stacked_netdev_handler,
 688                                NULL);
 689         if (r < 0)
 690                 return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
 691                                             netdev->ifname);
 692
 693         log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
 694         return 0;
 695 }
 696
 697 int independent_netdev_process_request(Request *req, Link *link, void *userdata) {
 698         NetDev *netdev = ASSERT_PTR(userdata);
 699         int r;
 700
 701         assert(!link);
 702
 703         r = netdev_is_ready_to_create(netdev, NULL);
 704         if (r <= 0)
 705                 return r;
 706
 707         r = independent_netdev_create(netdev);
 708         if (r < 0)
 709                 return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 710
 711         return 1;
 712 }
 713
 714 static int netdev_request_to_create(NetDev *netdev) {
 715         int r;
 716
 717         assert(netdev);
 718
 719         if (netdev_is_stacked(netdev))
 720                 return 0;
 721
 722         r = netdev_is_ready_to_create(netdev, NULL);
 723         if (r < 0)
 724                 return r;
 725         if (r > 0) {
 726                 /* If the netdev has no dependency, then create it now. */
 727                 r = independent_netdev_create(netdev);
 728                 if (r < 0)
 729                         return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 730
 731         } else {
 732                 /* Otherwise, wait for the dependencies being resolved. */
 733                 r = netdev_queue_request(netdev, NULL);
 734                 if (r < 0)
 735                         return log_netdev_warning_errno(netdev, r, "Failed to request to create: %m");
 736         }
 737
 738         return 0;
 739 }
 740
 741 int netdev_load_one(Manager *manager, const char *filename) {
 742         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 743         const char *dropin_dirname;
 744         int r;
 745
 746         assert(manager);
 747         assert(filename);
 748
 749         r = null_or_empty_path(filename);
 750         if (r == -ENOENT)
 751                 return 0;
 752         if (r < 0)
 753                 return r;
 754         if (r > 0) {
 755                 log_debug("Skipping empty file: %s", filename);
 756                 return 0;
 757         }
 758
 759         netdev_raw = new(NetDev, 1);
 760         if (!netdev_raw)
 761                 return log_oom();
 762
 763         *netdev_raw = (NetDev) {
 764                 .n_ref = 1,
 765                 .kind = _NETDEV_KIND_INVALID,
 766                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 767         };
 768
 769         dropin_dirname = strjoina(basename(filename), ".d");
 770         r = config_parse_many(
 771                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 772                         NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
 773                         config_item_perf_lookup, network_netdev_gperf_lookup,
 774                         CONFIG_PARSE_WARN,
 775                         netdev_raw,
 776                         NULL);
 777         if (r < 0)
 778                 return r;
 779
 780         /* skip out early if configuration does not match the environment */
 781         if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
 782                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 783                 return 0;
 784         }
 785
 786         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 787                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 788                 return 0;
 789         }
 790
 791         if (!netdev_raw->ifname) {
 792                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 793                 return 0;
 794         }
 795
 796         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 797         if (!netdev)
 798                 return log_oom();
 799
 800         netdev->n_ref = 1;
 801         netdev->manager = manager;
 802         netdev->kind = netdev_raw->kind;
 803         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 804                                                  so that done() will be called on destruction */
 805
 806         if (NETDEV_VTABLE(netdev)->init)
 807                 NETDEV_VTABLE(netdev)->init(netdev);
 808
 809         r = config_parse_many(
 810                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 811                         NETDEV_VTABLE(netdev)->sections,
 812                         config_item_perf_lookup, network_netdev_gperf_lookup,
 813                         CONFIG_PARSE_WARN,
 814                         netdev, NULL);
 815         if (r < 0)
 816                 return r;
 817
 818         /* verify configuration */
 819         if (NETDEV_VTABLE(netdev)->config_verify) {
 820                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 821                 if (r < 0)
 822                         return 0;
 823         }
 824
 825         netdev->filename = strdup(filename);
 826         if (!netdev->filename)
 827                 return log_oom();
 828
 829         r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
 830         if (r == -ENOMEM)
 831                 return log_oom();
 832         if (r == -EEXIST) {
 833                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 834
 835                 assert(n);
 836                 if (!streq(netdev->filename, n->filename))
 837                         log_netdev_warning_errno(netdev, r,
 838                                                  "Device was already configured by file %s, ignoring %s.",
 839                                                  n->filename, netdev->filename);
 840
 841                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 842                  * removed from the hashmap 'manager->netdevs'. */
 843                 netdev->ifname = mfree(netdev->ifname);
 844                 return 0;
 845         }
 846         if (r < 0)
 847                 return r;
 848
 849         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 850
 851         r = netdev_request_to_create(netdev);
 852         if (r < 0)
 853                 return r;
 854
 855         TAKE_PTR(netdev);
 856         return 0;
 857 }
 858
 859 int netdev_load(Manager *manager, bool reload) {
 860         _cleanup_strv_free_ char **files = NULL;
 861         char **f;
 862         int r;
 863
 864         assert(manager);
 865
 866         if (!reload)
 867                 hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 868
 869         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 870         if (r < 0)
 871                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 872
 873         STRV_FOREACH(f, files) {
 874                 r = netdev_load_one(manager, *f);
 875                 if (r < 0)
 876                         log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
 877         }
 878
 879         return 0;
 880 }
 881
 882 int config_parse_netdev_kind(
 883                 const char *unit,
 884                 const char *filename,
 885                 unsigned line,
 886                 const char *section,
 887                 unsigned section_line,
 888                 const char *lvalue,
 889                 int ltype,
 890                 const char *rvalue,
 891                 void *data,
 892                 void *userdata) {
 893
 894         NetDevKind k, *kind = data;
 895
 896         assert(filename);
 897         assert(rvalue);
 898         assert(data);
 899
 900         k = netdev_kind_from_string(rvalue);
 901         if (k < 0) {
 902                 log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 903                 return 0;
 904         }
 905
 906         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 907                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 908                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 909                            netdev_kind_to_string(*kind), rvalue);
 910                 return 0;
 911         }
 912
 913         *kind = k;
 914
 915         return 0;
 916 }
 917
 918 int config_parse_netdev_hw_addr(
 919                 const char *unit,
 920                 const char *filename,
 921                 unsigned line,
 922                 const char *section,
 923                 unsigned section_line,
 924                 const char *lvalue,
 925                 int ltype,
 926                 const char *rvalue,
 927                 void *data,
 928                 void *userdata) {
 929
 930         struct hw_addr_data *hw_addr = data;
 931
 932         assert(rvalue);
 933         assert(data);
 934
 935         if (streq(rvalue, "none")) {
 936                 *hw_addr = HW_ADDR_NONE;
 937                 return 0;
 938         }
 939
 940         return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
 941 }