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 "networkd-sriov.h"
  35 #include "nlmon.h"
  36 #include "path-lookup.h"
  37 #include "siphash24.h"
  38 #include "stat-util.h"
  39 #include "string-table.h"
  40 #include "string-util.h"
  41 #include "strv.h"
  42 #include "tunnel.h"
  43 #include "tuntap.h"
  44 #include "vcan.h"
  45 #include "veth.h"
  46 #include "vlan.h"
  47 #include "vrf.h"
  48 #include "vxcan.h"
  49 #include "vxlan.h"
  50 #include "wireguard.h"
  51 #include "wlan.h"
  52 #include "xfrm.h"
  53
  54 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  55         [NETDEV_KIND_BAREUDP]   = &bare_udp_vtable,
  56         [NETDEV_KIND_BATADV]    = &batadv_vtable,
  57         [NETDEV_KIND_BOND]      = &bond_vtable,
  58         [NETDEV_KIND_BRIDGE]    = &bridge_vtable,
  59         [NETDEV_KIND_DUMMY]     = &dummy_vtable,
  60         [NETDEV_KIND_ERSPAN]    = &erspan_vtable,
  61         [NETDEV_KIND_FOU]       = &foutnl_vtable,
  62         [NETDEV_KIND_GENEVE]    = &geneve_vtable,
  63         [NETDEV_KIND_GRE]       = &gre_vtable,
  64         [NETDEV_KIND_GRETAP]    = &gretap_vtable,
  65         [NETDEV_KIND_IFB]       = &ifb_vtable,
  66         [NETDEV_KIND_IP6GRE]    = &ip6gre_vtable,
  67         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  68         [NETDEV_KIND_IP6TNL]    = &ip6tnl_vtable,
  69         [NETDEV_KIND_IPIP]      = &ipip_vtable,
  70         [NETDEV_KIND_IPOIB]     = &ipoib_vtable,
  71         [NETDEV_KIND_IPVLAN]    = &ipvlan_vtable,
  72         [NETDEV_KIND_IPVTAP]    = &ipvtap_vtable,
  73         [NETDEV_KIND_L2TP]      = &l2tptnl_vtable,
  74         [NETDEV_KIND_MACSEC]    = &macsec_vtable,
  75         [NETDEV_KIND_MACVLAN]   = &macvlan_vtable,
  76         [NETDEV_KIND_MACVTAP]   = &macvtap_vtable,
  77         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  78         [NETDEV_KIND_NLMON]     = &nlmon_vtable,
  79         [NETDEV_KIND_SIT]       = &sit_vtable,
  80         [NETDEV_KIND_TAP]       = &tap_vtable,
  81         [NETDEV_KIND_TUN]       = &tun_vtable,
  82         [NETDEV_KIND_VCAN]      = &vcan_vtable,
  83         [NETDEV_KIND_VETH]      = &veth_vtable,
  84         [NETDEV_KIND_VLAN]      = &vlan_vtable,
  85         [NETDEV_KIND_VRF]       = &vrf_vtable,
  86         [NETDEV_KIND_VTI6]      = &vti6_vtable,
  87         [NETDEV_KIND_VTI]       = &vti_vtable,
  88         [NETDEV_KIND_VXCAN]     = &vxcan_vtable,
  89         [NETDEV_KIND_VXLAN]     = &vxlan_vtable,
  90         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  91         [NETDEV_KIND_WLAN]      = &wlan_vtable,
  92         [NETDEV_KIND_XFRM]      = &xfrm_vtable,
  93 };
  94
  95 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  96         [NETDEV_KIND_BAREUDP]   = "bareudp",
  97         [NETDEV_KIND_BATADV]    = "batadv",
  98         [NETDEV_KIND_BOND]      = "bond",
  99         [NETDEV_KIND_BRIDGE]    = "bridge",
 100         [NETDEV_KIND_DUMMY]     = "dummy",
 101         [NETDEV_KIND_ERSPAN]    = "erspan",
 102         [NETDEV_KIND_FOU]       = "fou",
 103         [NETDEV_KIND_GENEVE]    = "geneve",
 104         [NETDEV_KIND_GRE]       = "gre",
 105         [NETDEV_KIND_GRETAP]    = "gretap",
 106         [NETDEV_KIND_IFB]       = "ifb",
 107         [NETDEV_KIND_IP6GRE]    = "ip6gre",
 108         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
 109         [NETDEV_KIND_IP6TNL]    = "ip6tnl",
 110         [NETDEV_KIND_IPIP]      = "ipip",
 111         [NETDEV_KIND_IPOIB]     = "ipoib",
 112         [NETDEV_KIND_IPVLAN]    = "ipvlan",
 113         [NETDEV_KIND_IPVTAP]    = "ipvtap",
 114         [NETDEV_KIND_L2TP]      = "l2tp",
 115         [NETDEV_KIND_MACSEC]    = "macsec",
 116         [NETDEV_KIND_MACVLAN]   = "macvlan",
 117         [NETDEV_KIND_MACVTAP]   = "macvtap",
 118         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 119         [NETDEV_KIND_NLMON]     = "nlmon",
 120         [NETDEV_KIND_SIT]       = "sit",
 121         [NETDEV_KIND_TAP]       = "tap",
 122         [NETDEV_KIND_TUN]       = "tun",
 123         [NETDEV_KIND_VCAN]      = "vcan",
 124         [NETDEV_KIND_VETH]      = "veth",
 125         [NETDEV_KIND_VLAN]      = "vlan",
 126         [NETDEV_KIND_VRF]       = "vrf",
 127         [NETDEV_KIND_VTI6]      = "vti6",
 128         [NETDEV_KIND_VTI]       = "vti",
 129         [NETDEV_KIND_VXCAN]     = "vxcan",
 130         [NETDEV_KIND_VXLAN]     = "vxlan",
 131         [NETDEV_KIND_WIREGUARD] = "wireguard",
 132         [NETDEV_KIND_WLAN]      = "wlan",
 133         [NETDEV_KIND_XFRM]      = "xfrm",
 134 };
 135
 136 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 137
 138 bool netdev_is_managed(NetDev *netdev) {
 139         if (!netdev || !netdev->manager || !netdev->ifname)
 140                 return false;
 141
 142         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 143 }
 144
 145 static bool netdev_is_stacked_and_independent(NetDev *netdev) {
 146         assert(netdev);
 147
 148         if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
 149                 return false;
 150
 151         switch (netdev->kind) {
 152         case NETDEV_KIND_ERSPAN:
 153                 return ERSPAN(netdev)->independent;
 154         case NETDEV_KIND_GRE:
 155                 return GRE(netdev)->independent;
 156         case NETDEV_KIND_GRETAP:
 157                 return GRETAP(netdev)->independent;
 158         case NETDEV_KIND_IP6GRE:
 159                 return IP6GRE(netdev)->independent;
 160         case NETDEV_KIND_IP6GRETAP:
 161                 return IP6GRETAP(netdev)->independent;
 162         case NETDEV_KIND_IP6TNL:
 163                 return IP6TNL(netdev)->independent;
 164         case NETDEV_KIND_IPIP:
 165                 return IPIP(netdev)->independent;
 166         case NETDEV_KIND_SIT:
 167                 return SIT(netdev)->independent;
 168         case NETDEV_KIND_VTI:
 169                 return VTI(netdev)->independent;
 170         case NETDEV_KIND_VTI6:
 171                 return VTI6(netdev)->independent;
 172         case NETDEV_KIND_VXLAN:
 173                 return VXLAN(netdev)->independent;
 174         case NETDEV_KIND_XFRM:
 175                 return XFRM(netdev)->independent;
 176         default:
 177                 return false;
 178         }
 179 }
 180
 181 static bool netdev_is_stacked(NetDev *netdev) {
 182         assert(netdev);
 183
 184         if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
 185                 return false;
 186
 187         if (netdev_is_stacked_and_independent(netdev))
 188                 return false;
 189
 190         return true;
 191 }
 192
 193 static void netdev_detach_from_manager(NetDev *netdev) {
 194         if (netdev->ifname && netdev->manager)
 195                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 196 }
 197
 198 static NetDev *netdev_free(NetDev *netdev) {
 199         assert(netdev);
 200
 201         netdev_detach_from_manager(netdev);
 202
 203         free(netdev->filename);
 204
 205         free(netdev->description);
 206         free(netdev->ifname);
 207         condition_free_list(netdev->conditions);
 208
 209         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 210          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 211          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 212          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 213          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 214          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 215          * call. */
 216         if (netdev->state != _NETDEV_STATE_INVALID &&
 217             NETDEV_VTABLE(netdev) &&
 218             NETDEV_VTABLE(netdev)->done)
 219                 NETDEV_VTABLE(netdev)->done(netdev);
 220
 221         return mfree(netdev);
 222 }
 223
 224 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 225
 226 void netdev_drop(NetDev *netdev) {
 227         if (!netdev)
 228                 return;
 229
 230         if (netdev_is_stacked(netdev)) {
 231                 /* The netdev may be removed due to the underlying device removal, and the device may
 232                  * be re-added later. */
 233                 netdev->state = NETDEV_STATE_LOADING;
 234                 netdev->ifindex = 0;
 235
 236                 log_netdev_debug(netdev, "netdev removed");
 237                 return;
 238         }
 239
 240         netdev->state = NETDEV_STATE_LINGER;
 241
 242         log_netdev_debug(netdev, "netdev removed");
 243
 244         netdev_detach_from_manager(netdev);
 245         netdev_unref(netdev);
 246         return;
 247 }
 248
 249 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 250         NetDev *netdev;
 251
 252         assert(manager);
 253         assert(name);
 254         assert(ret);
 255
 256         netdev = hashmap_get(manager->netdevs, name);
 257         if (!netdev)
 258                 return -ENOENT;
 259
 260         *ret = netdev;
 261
 262         return 0;
 263 }
 264
 265 void netdev_enter_failed(NetDev *netdev) {
 266         netdev->state = NETDEV_STATE_FAILED;
 267 }
 268
 269 static int netdev_enter_ready(NetDev *netdev) {
 270         assert(netdev);
 271         assert(netdev->ifname);
 272
 273         if (netdev->state != NETDEV_STATE_CREATING)
 274                 return 0;
 275
 276         netdev->state = NETDEV_STATE_READY;
 277
 278         log_netdev_info(netdev, "netdev ready");
 279
 280         if (NETDEV_VTABLE(netdev)->post_create)
 281                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL);
 282
 283         return 0;
 284 }
 285
 286 /* callback for netdev's created without a backing Link */
 287 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 288         int r;
 289
 290         assert(netdev);
 291         assert(netdev->state != _NETDEV_STATE_INVALID);
 292
 293         r = sd_netlink_message_get_errno(m);
 294         if (r == -EEXIST)
 295                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 296         else if (r < 0) {
 297                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 298                 netdev_enter_failed(netdev);
 299
 300                 return 1;
 301         }
 302
 303         log_netdev_debug(netdev, "Created");
 304
 305         return 1;
 306 }
 307
 308 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 309         uint16_t type;
 310         const char *kind;
 311         const char *received_kind;
 312         const char *received_name;
 313         int r, ifindex;
 314
 315         assert(netdev);
 316         assert(message);
 317
 318         r = sd_netlink_message_get_type(message, &type);
 319         if (r < 0)
 320                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 321
 322         if (type != RTM_NEWLINK)
 323                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
 324
 325         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 326         if (r < 0) {
 327                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 328                 netdev_enter_failed(netdev);
 329                 return r;
 330         } else if (ifindex <= 0) {
 331                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 332                 netdev_enter_failed(netdev);
 333                 return -EINVAL;
 334         }
 335
 336         if (netdev->ifindex > 0) {
 337                 if (netdev->ifindex != ifindex) {
 338                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 339                                          ifindex, netdev->ifindex);
 340                         netdev_enter_failed(netdev);
 341                         return -EEXIST;
 342                 } else
 343                         /* ifindex already set to the same for this netdev */
 344                         return 0;
 345         }
 346
 347         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 348         if (r < 0)
 349                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 350
 351         if (!streq(netdev->ifname, received_name)) {
 352                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 353                 netdev_enter_failed(netdev);
 354                 return -EINVAL;
 355         }
 356
 357         if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
 358
 359                 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 360                 if (r < 0)
 361                         return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 362
 363                 r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 364                 if (r < 0)
 365                         return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 366
 367                 r = sd_netlink_message_exit_container(message);
 368                 if (r < 0)
 369                         return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 370
 371                 if (netdev->kind == NETDEV_KIND_TAP)
 372                         /* the kernel does not distinguish between tun and tap */
 373                         kind = "tun";
 374                 else {
 375                         kind = netdev_kind_to_string(netdev->kind);
 376                         if (!kind) {
 377                                 log_netdev_error(netdev, "Could not get kind");
 378                                 netdev_enter_failed(netdev);
 379                                 return -EINVAL;
 380                         }
 381                 }
 382
 383                 if (!streq(kind, received_kind)) {
 384                         log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
 385                                          received_kind, kind);
 386                         netdev_enter_failed(netdev);
 387                         return -EINVAL;
 388                 }
 389         }
 390
 391         netdev->ifindex = ifindex;
 392
 393         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 394
 395         netdev_enter_ready(netdev);
 396
 397         return 0;
 398 }
 399
 400 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 401
 402 int netdev_generate_hw_addr(
 403                 NetDev *netdev,
 404                 Link *parent,
 405                 const char *name,
 406                 const struct hw_addr_data *hw_addr,
 407                 struct hw_addr_data *ret) {
 408
 409         struct hw_addr_data a = HW_ADDR_NULL;
 410         bool is_static = false;
 411         int r;
 412
 413         assert(netdev);
 414         assert(name);
 415         assert(hw_addr);
 416         assert(ret);
 417
 418         if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
 419                 *ret = HW_ADDR_NULL;
 420                 return 0;
 421         }
 422
 423         if (hw_addr->length == 0) {
 424                 uint64_t result;
 425
 426                 /* HardwareAddress= is not specified. */
 427
 428                 if (!NETDEV_VTABLE(netdev)->generate_mac)
 429                         goto finalize;
 430
 431                 if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
 432                         goto finalize;
 433
 434                 r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
 435                 if (r < 0) {
 436                         log_netdev_warning_errno(netdev, r,
 437                                                  "Failed to generate persistent MAC address, ignoring: %m");
 438                         goto finalize;
 439                 }
 440
 441                 a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
 442
 443                 switch (NETDEV_VTABLE(netdev)->iftype) {
 444                 case ARPHRD_ETHER:
 445                         assert(a.length <= sizeof(result));
 446                         memcpy(a.bytes, &result, a.length);
 447
 448                         if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
 449                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 450                                                          "Failed to generate persistent MAC address, ignoring: %m");
 451                                 a = HW_ADDR_NULL;
 452                                 goto finalize;
 453                         }
 454
 455                         break;
 456                 case ARPHRD_INFINIBAND:
 457                         if (result == 0) {
 458                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 459                                                          "Failed to generate persistent MAC address: %m");
 460                                 goto finalize;
 461                         }
 462
 463                         assert(a.length >= sizeof(result));
 464                         memzero(a.bytes, a.length - sizeof(result));
 465                         memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
 466                         break;
 467                 default:
 468                         assert_not_reached();
 469                 }
 470
 471         } else {
 472                 a = *hw_addr;
 473                 is_static = true;
 474         }
 475
 476         r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
 477                                         parent ? &parent->hw_addr : NULL, &a);
 478         if (r < 0)
 479                 return r;
 480
 481 finalize:
 482         *ret = a;
 483         return 0;
 484 }
 485
 486 static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
 487         int r;
 488
 489         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 490         if (r < 0)
 491                 return r;
 492
 493         struct hw_addr_data hw_addr;
 494         r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
 495         if (r < 0)
 496                 return r;
 497
 498         if (hw_addr.length > 0) {
 499                 log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
 500                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
 501                 if (r < 0)
 502                         return r;
 503         }
 504
 505         if (netdev->mtu != 0) {
 506                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 507                 if (r < 0)
 508                         return r;
 509         }
 510
 511         if (link) {
 512                 r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 513                 if (r < 0)
 514                         return r;
 515         }
 516
 517         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 518         if (r < 0)
 519                 return r;
 520
 521         if (NETDEV_VTABLE(netdev)->fill_message_create) {
 522                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 523                 if (r < 0)
 524                         return r;
 525
 526                 r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 527                 if (r < 0)
 528                         return r;
 529
 530                 r = sd_netlink_message_close_container(m);
 531                 if (r < 0)
 532                         return r;
 533         } else {
 534                 r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
 535                 if (r < 0)
 536                         return r;
 537         }
 538
 539         r = sd_netlink_message_close_container(m);
 540         if (r < 0)
 541                 return r;
 542
 543         return 0;
 544 }
 545
 546 static int independent_netdev_create(NetDev *netdev) {
 547         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 548         int r;
 549
 550         assert(netdev);
 551
 552         /* create netdev */
 553         if (NETDEV_VTABLE(netdev)->create) {
 554                 r = NETDEV_VTABLE(netdev)->create(netdev);
 555                 if (r < 0)
 556                         return r;
 557
 558                 log_netdev_debug(netdev, "Created");
 559                 return 0;
 560         }
 561
 562         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 563         if (r < 0)
 564                 return r;
 565
 566         r = netdev_create_message(netdev, NULL, m);
 567         if (r < 0)
 568                 return r;
 569
 570         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 571                                netdev_destroy_callback, netdev);
 572         if (r < 0)
 573                 return r;
 574
 575         netdev_ref(netdev);
 576
 577         netdev->state = NETDEV_STATE_CREATING;
 578         log_netdev_debug(netdev, "Creating");
 579         return 0;
 580 }
 581
 582 static int stacked_netdev_create(NetDev *netdev, Link *link, Request *req) {
 583         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 584         int r;
 585
 586         assert(netdev);
 587         assert(netdev->manager);
 588         assert(link);
 589         assert(req);
 590
 591         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 592         if (r < 0)
 593                 return r;
 594
 595         r = netdev_create_message(netdev, link, m);
 596         if (r < 0)
 597                 return r;
 598
 599         r = request_call_netlink_async(netdev->manager->rtnl, m, req);
 600         if (r < 0)
 601                 return r;
 602
 603         netdev->state = NETDEV_STATE_CREATING;
 604         log_netdev_debug(netdev, "Creating");
 605         return 0;
 606 }
 607
 608 static bool link_is_ready_to_create_stacked_netdev_one(Link *link, bool allow_unmanaged) {
 609         assert(link);
 610
 611         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
 612                 return false;
 613
 614         if (!link->network)
 615                 return allow_unmanaged;
 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         return true;
 626 }
 627
 628 static bool link_is_ready_to_create_stacked_netdev(Link *link) {
 629         return check_ready_for_all_sr_iov_ports(link, /* allow_unmanaged = */ false,
 630                                                 link_is_ready_to_create_stacked_netdev_one);
 631 }
 632
 633 static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
 634         assert(netdev);
 635
 636         if (netdev->state != NETDEV_STATE_LOADING)
 637                 return false;
 638
 639         if (link && !link_is_ready_to_create_stacked_netdev(link))
 640                 return false;
 641
 642         if (NETDEV_VTABLE(netdev)->is_ready_to_create)
 643                 return NETDEV_VTABLE(netdev)->is_ready_to_create(netdev, link);
 644
 645         return true;
 646 }
 647
 648 static int stacked_netdev_process_request(Request *req, Link *link, void *userdata) {
 649         NetDev *netdev = ASSERT_PTR(userdata);
 650         int r;
 651
 652         assert(req);
 653         assert(link);
 654
 655         r = netdev_is_ready_to_create(netdev, link);
 656         if (r <= 0)
 657                 return r;
 658
 659         r = stacked_netdev_create(netdev, link, req);
 660         if (r < 0)
 661                 return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 662
 663         return 1;
 664 }
 665
 666 static int create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
 667         int r;
 668
 669         assert(m);
 670         assert(link);
 671
 672         r = sd_netlink_message_get_errno(m);
 673         if (r < 0 && r != -EEXIST) {
 674                 log_link_message_warning_errno(link, m, r, "Could not create stacked netdev");
 675                 link_enter_failed(link);
 676                 return 0;
 677         }
 678
 679         if (link->create_stacked_netdev_messages == 0) {
 680                 link->stacked_netdevs_created = true;
 681                 log_link_debug(link, "Stacked netdevs created.");
 682                 link_check_ready(link);
 683         }
 684
 685         return 0;
 686 }
 687
 688 int link_request_stacked_netdev(Link *link, NetDev *netdev) {
 689         int r;
 690
 691         assert(link);
 692         assert(netdev);
 693
 694         if (!netdev_is_stacked(netdev))
 695                 return -EINVAL;
 696
 697         if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_FAILED) || netdev->ifindex > 0)
 698                 return 0; /* Already created. */
 699
 700         link->stacked_netdevs_created = false;
 701         r = link_queue_request_full(link, REQUEST_TYPE_NETDEV_STACKED,
 702                                     netdev_ref(netdev), (mfree_func_t) netdev_unref,
 703                                     trivial_hash_func, trivial_compare_func,
 704                                     stacked_netdev_process_request,
 705                                     &link->create_stacked_netdev_messages,
 706                                     create_stacked_netdev_handler, NULL);
 707         if (r < 0)
 708                 return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
 709                                             netdev->ifname);
 710
 711         log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
 712         return 0;
 713 }
 714
 715 static int independent_netdev_process_request(Request *req, Link *link, void *userdata) {
 716         NetDev *netdev = ASSERT_PTR(userdata);
 717         int r;
 718
 719         assert(!link);
 720
 721         r = netdev_is_ready_to_create(netdev, NULL);
 722         if (r <= 0)
 723                 return r;
 724
 725         r = independent_netdev_create(netdev);
 726         if (r < 0)
 727                 return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 728
 729         return 1;
 730 }
 731
 732 static int netdev_request_to_create(NetDev *netdev) {
 733         int r;
 734
 735         assert(netdev);
 736
 737         if (netdev_is_stacked(netdev))
 738                 return 0;
 739
 740         r = netdev_is_ready_to_create(netdev, NULL);
 741         if (r < 0)
 742                 return r;
 743         if (r > 0) {
 744                 /* If the netdev has no dependency, then create it now. */
 745                 r = independent_netdev_create(netdev);
 746                 if (r < 0)
 747                         return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 748
 749         } else {
 750                 /* Otherwise, wait for the dependencies being resolved. */
 751                 r = netdev_queue_request(netdev, independent_netdev_process_request, NULL);
 752                 if (r < 0)
 753                         return log_netdev_warning_errno(netdev, r, "Failed to request to create netdev: %m");
 754         }
 755
 756         return 0;
 757 }
 758
 759 int netdev_load_one(Manager *manager, const char *filename) {
 760         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 761         const char *dropin_dirname;
 762         int r;
 763
 764         assert(manager);
 765         assert(filename);
 766
 767         r = null_or_empty_path(filename);
 768         if (r < 0)
 769                 return log_warning_errno(r, "Failed to check if \"%s\" is empty: %m", filename);
 770         if (r > 0) {
 771                 log_debug("Skipping empty file: %s", filename);
 772                 return 0;
 773         }
 774
 775         netdev_raw = new(NetDev, 1);
 776         if (!netdev_raw)
 777                 return log_oom();
 778
 779         *netdev_raw = (NetDev) {
 780                 .n_ref = 1,
 781                 .kind = _NETDEV_KIND_INVALID,
 782                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 783         };
 784
 785         dropin_dirname = strjoina(basename(filename), ".d");
 786         r = config_parse_many(
 787                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 788                         NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
 789                         config_item_perf_lookup, network_netdev_gperf_lookup,
 790                         CONFIG_PARSE_WARN,
 791                         netdev_raw,
 792                         NULL,
 793                         NULL);
 794         if (r < 0)
 795                 return r; /* config_parse_many() logs internally. */
 796
 797         /* skip out early if configuration does not match the environment */
 798         if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
 799                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 800                 return 0;
 801         }
 802
 803         if (netdev_raw->kind == _NETDEV_KIND_INVALID)
 804                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev has no Kind= configured in \"%s\", ignoring.", filename);
 805
 806         if (!netdev_raw->ifname)
 807                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev without Name= configured in \"%s\", ignoring.", filename);
 808
 809         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 810         if (!netdev)
 811                 return log_oom();
 812
 813         netdev->n_ref = 1;
 814         netdev->manager = manager;
 815         netdev->kind = netdev_raw->kind;
 816         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 817                                                  so that done() will be called on destruction */
 818
 819         if (NETDEV_VTABLE(netdev)->init)
 820                 NETDEV_VTABLE(netdev)->init(netdev);
 821
 822         r = config_parse_many(
 823                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 824                         NETDEV_VTABLE(netdev)->sections,
 825                         config_item_perf_lookup, network_netdev_gperf_lookup,
 826                         CONFIG_PARSE_WARN,
 827                         netdev, NULL, NULL);
 828         if (r < 0)
 829                 return r; /* config_parse_many() logs internally. */
 830
 831         /* verify configuration */
 832         if (NETDEV_VTABLE(netdev)->config_verify) {
 833                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 834                 if (r < 0)
 835                         return r; /* config_verify() logs internally. */
 836         }
 837
 838         netdev->filename = strdup(filename);
 839         if (!netdev->filename)
 840                 return log_oom();
 841
 842         r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
 843         if (r == -ENOMEM)
 844                 return log_oom();
 845         if (r == -EEXIST) {
 846                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 847
 848                 assert(n);
 849                 if (!streq(netdev->filename, n->filename))
 850                         log_netdev_warning_errno(netdev, r,
 851                                                  "Device was already configured by \"%s\", ignoring %s.",
 852                                                  n->filename, netdev->filename);
 853
 854                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 855                  * removed from the hashmap 'manager->netdevs'. */
 856                 netdev->ifname = mfree(netdev->ifname);
 857                 return -EEXIST;
 858         }
 859         assert(r > 0);
 860
 861         log_netdev_debug(netdev, "loaded \"%s\"", netdev_kind_to_string(netdev->kind));
 862
 863         r = netdev_request_to_create(netdev);
 864         if (r < 0)
 865                 return r; /* netdev_request_to_create() logs internally. */
 866
 867         TAKE_PTR(netdev);
 868         return 0;
 869 }
 870
 871 int netdev_load(Manager *manager, bool reload) {
 872         _cleanup_strv_free_ char **files = NULL;
 873         int r;
 874
 875         assert(manager);
 876
 877         if (!reload)
 878                 hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 879
 880         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 881         if (r < 0)
 882                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 883
 884         STRV_FOREACH(f, files)
 885                 (void) netdev_load_one(manager, *f);
 886
 887         return 0;
 888 }
 889
 890 int config_parse_netdev_kind(
 891                 const char *unit,
 892                 const char *filename,
 893                 unsigned line,
 894                 const char *section,
 895                 unsigned section_line,
 896                 const char *lvalue,
 897                 int ltype,
 898                 const char *rvalue,
 899                 void *data,
 900                 void *userdata) {
 901
 902         NetDevKind k, *kind = data;
 903
 904         assert(filename);
 905         assert(rvalue);
 906         assert(data);
 907
 908         k = netdev_kind_from_string(rvalue);
 909         if (k < 0) {
 910                 log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 911                 return 0;
 912         }
 913
 914         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 915                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 916                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 917                            netdev_kind_to_string(*kind), rvalue);
 918                 return 0;
 919         }
 920
 921         *kind = k;
 922
 923         return 0;
 924 }
 925
 926 int config_parse_netdev_hw_addr(
 927                 const char *unit,
 928                 const char *filename,
 929                 unsigned line,
 930                 const char *section,
 931                 unsigned section_line,
 932                 const char *lvalue,
 933                 int ltype,
 934                 const char *rvalue,
 935                 void *data,
 936                 void *userdata) {
 937
 938         struct hw_addr_data *hw_addr = data;
 939
 940         assert(rvalue);
 941         assert(data);
 942
 943         if (streq(rvalue, "none")) {
 944                 *hw_addr = HW_ADDR_NONE;
 945                 return 0;
 946         }
 947
 948         return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
 949 }