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 (!IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_STACKED, NETDEV_CREATE_AFTER_CONFIGURED))
 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 (!IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_STACKED, NETDEV_CREATE_AFTER_CONFIGURED))
 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                 *ret = NULL;
 258                 return -ENOENT;
 259         }
 260
 261         *ret = netdev;
 262
 263         return 0;
 264 }
 265
 266 void netdev_enter_failed(NetDev *netdev) {
 267         netdev->state = NETDEV_STATE_FAILED;
 268 }
 269
 270 static int netdev_enter_ready(NetDev *netdev) {
 271         assert(netdev);
 272         assert(netdev->ifname);
 273
 274         if (netdev->state != NETDEV_STATE_CREATING)
 275                 return 0;
 276
 277         netdev->state = NETDEV_STATE_READY;
 278
 279         log_netdev_info(netdev, "netdev ready");
 280
 281         if (NETDEV_VTABLE(netdev)->post_create)
 282                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 283
 284         return 0;
 285 }
 286
 287 /* callback for netdev's created without a backing Link */
 288 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 289         int r;
 290
 291         assert(netdev);
 292         assert(netdev->state != _NETDEV_STATE_INVALID);
 293
 294         r = sd_netlink_message_get_errno(m);
 295         if (r == -EEXIST)
 296                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 297         else if (r < 0) {
 298                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 299                 netdev_enter_failed(netdev);
 300
 301                 return 1;
 302         }
 303
 304         log_netdev_debug(netdev, "Created");
 305
 306         return 1;
 307 }
 308
 309 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 310         uint16_t type;
 311         const char *kind;
 312         const char *received_kind;
 313         const char *received_name;
 314         int r, ifindex;
 315
 316         assert(netdev);
 317         assert(message);
 318
 319         r = sd_netlink_message_get_type(message, &type);
 320         if (r < 0)
 321                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 322
 323         if (type != RTM_NEWLINK)
 324                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
 325
 326         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 327         if (r < 0) {
 328                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 329                 netdev_enter_failed(netdev);
 330                 return r;
 331         } else if (ifindex <= 0) {
 332                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 333                 netdev_enter_failed(netdev);
 334                 return -EINVAL;
 335         }
 336
 337         if (netdev->ifindex > 0) {
 338                 if (netdev->ifindex != ifindex) {
 339                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 340                                          ifindex, netdev->ifindex);
 341                         netdev_enter_failed(netdev);
 342                         return -EEXIST;
 343                 } else
 344                         /* ifindex already set to the same for this netdev */
 345                         return 0;
 346         }
 347
 348         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 349         if (r < 0)
 350                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 351
 352         if (!streq(netdev->ifname, received_name)) {
 353                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 354                 netdev_enter_failed(netdev);
 355                 return -EINVAL;
 356         }
 357
 358         if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
 359
 360                 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 361                 if (r < 0)
 362                         return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 363
 364                 r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 365                 if (r < 0)
 366                         return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 367
 368                 r = sd_netlink_message_exit_container(message);
 369                 if (r < 0)
 370                         return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 371
 372                 if (netdev->kind == NETDEV_KIND_TAP)
 373                         /* the kernel does not distinguish between tun and tap */
 374                         kind = "tun";
 375                 else {
 376                         kind = netdev_kind_to_string(netdev->kind);
 377                         if (!kind) {
 378                                 log_netdev_error(netdev, "Could not get kind");
 379                                 netdev_enter_failed(netdev);
 380                                 return -EINVAL;
 381                         }
 382                 }
 383
 384                 if (!streq(kind, received_kind)) {
 385                         log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
 386                                          received_kind, kind);
 387                         netdev_enter_failed(netdev);
 388                         return -EINVAL;
 389                 }
 390         }
 391
 392         netdev->ifindex = ifindex;
 393
 394         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 395
 396         netdev_enter_ready(netdev);
 397
 398         return 0;
 399 }
 400
 401 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 402
 403 int netdev_generate_hw_addr(
 404                 NetDev *netdev,
 405                 Link *parent,
 406                 const char *name,
 407                 const struct hw_addr_data *hw_addr,
 408                 struct hw_addr_data *ret) {
 409
 410         struct hw_addr_data a = HW_ADDR_NULL;
 411         bool is_static = false;
 412         int r;
 413
 414         assert(netdev);
 415         assert(name);
 416         assert(hw_addr);
 417         assert(ret);
 418
 419         if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
 420                 *ret = HW_ADDR_NULL;
 421                 return 0;
 422         }
 423
 424         if (hw_addr->length == 0) {
 425                 uint64_t result;
 426
 427                 /* HardwareAddress= is not specified. */
 428
 429                 if (!NETDEV_VTABLE(netdev)->generate_mac)
 430                         goto finalize;
 431
 432                 if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
 433                         goto finalize;
 434
 435                 r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
 436                 if (r < 0) {
 437                         log_netdev_warning_errno(netdev, r,
 438                                                  "Failed to generate persistent MAC address, ignoring: %m");
 439                         goto finalize;
 440                 }
 441
 442                 a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
 443
 444                 switch (NETDEV_VTABLE(netdev)->iftype) {
 445                 case ARPHRD_ETHER:
 446                         assert(a.length <= sizeof(result));
 447                         memcpy(a.bytes, &result, a.length);
 448
 449                         if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
 450                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 451                                                          "Failed to generate persistent MAC address, ignoring: %m");
 452                                 a = HW_ADDR_NULL;
 453                                 goto finalize;
 454                         }
 455
 456                         break;
 457                 case ARPHRD_INFINIBAND:
 458                         if (result == 0) {
 459                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 460                                                          "Failed to generate persistent MAC address: %m");
 461                                 goto finalize;
 462                         }
 463
 464                         assert(a.length >= sizeof(result));
 465                         memzero(a.bytes, a.length - sizeof(result));
 466                         memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
 467                         break;
 468                 default:
 469                         assert_not_reached();
 470                 }
 471
 472         } else {
 473                 a = *hw_addr;
 474                 is_static = true;
 475         }
 476
 477         r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
 478                                         parent ? &parent->hw_addr : NULL, &a);
 479         if (r < 0)
 480                 return r;
 481
 482 finalize:
 483         *ret = a;
 484         return 0;
 485 }
 486
 487 static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
 488         int r;
 489
 490         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 491         if (r < 0)
 492                 return r;
 493
 494         struct hw_addr_data hw_addr;
 495         r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
 496         if (r < 0)
 497                 return r;
 498
 499         if (hw_addr.length > 0) {
 500                 log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
 501                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
 502                 if (r < 0)
 503                         return r;
 504         }
 505
 506         if (netdev->mtu != 0) {
 507                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 508                 if (r < 0)
 509                         return r;
 510         }
 511
 512         if (link) {
 513                 r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 514                 if (r < 0)
 515                         return r;
 516         }
 517
 518         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 519         if (r < 0)
 520                 return r;
 521
 522         if (NETDEV_VTABLE(netdev)->fill_message_create) {
 523                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 524                 if (r < 0)
 525                         return r;
 526
 527                 r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 528                 if (r < 0)
 529                         return r;
 530
 531                 r = sd_netlink_message_close_container(m);
 532                 if (r < 0)
 533                         return r;
 534         } else {
 535                 r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
 536                 if (r < 0)
 537                         return r;
 538         }
 539
 540         r = sd_netlink_message_close_container(m);
 541         if (r < 0)
 542                 return r;
 543
 544         return 0;
 545 }
 546
 547 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 548         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 549         int r;
 550
 551         assert(netdev);
 552         assert(!link || callback);
 553
 554         /* create netdev */
 555         if (NETDEV_VTABLE(netdev)->create) {
 556                 assert(!link);
 557
 558                 r = NETDEV_VTABLE(netdev)->create(netdev);
 559                 if (r < 0)
 560                         return r;
 561
 562                 log_netdev_debug(netdev, "Created");
 563                 return 0;
 564         }
 565
 566         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 567         if (r < 0)
 568                 return log_netdev_error_errno(netdev, r, "Could not allocate netlink message: %m");
 569
 570         r = netdev_create_message(netdev, link, m);
 571         if (r < 0)
 572                 return log_netdev_error_errno(netdev, r, "Could not create netlink message: %m");
 573
 574         if (link) {
 575                 r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 576                                        link_netlink_destroy_callback, link);
 577                 if (r < 0)
 578                         return log_netdev_error_errno(netdev, r, "Could not send netlink message: %m");
 579
 580                 link_ref(link);
 581         } else {
 582                 r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 583                                        netdev_destroy_callback, netdev);
 584                 if (r < 0)
 585                         return log_netdev_error_errno(netdev, r, "Could not send netlink message: %m");
 586
 587                 netdev_ref(netdev);
 588         }
 589
 590         netdev->state = NETDEV_STATE_CREATING;
 591
 592         log_netdev_debug(netdev, "Creating");
 593         return 0;
 594 }
 595
 596 static int netdev_create_after_configured(NetDev *netdev, Link *link) {
 597         assert(netdev);
 598         assert(link);
 599         assert(NETDEV_VTABLE(netdev)->create_after_configured);
 600
 601         return NETDEV_VTABLE(netdev)->create_after_configured(netdev, link);
 602 }
 603
 604 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 605         int r;
 606
 607         assert(netdev);
 608         assert(netdev->manager);
 609         assert(netdev->manager->rtnl);
 610
 611         switch (netdev_get_create_type(netdev)) {
 612         case NETDEV_CREATE_STACKED:
 613                 r = netdev_create(netdev, link, callback);
 614                 if (r < 0)
 615                         return r;
 616
 617                 break;
 618         case NETDEV_CREATE_AFTER_CONFIGURED:
 619                 r = netdev_create_after_configured(netdev, link);
 620                 if (r < 0)
 621                         return r;
 622                 break;
 623         default:
 624                 assert_not_reached();
 625         }
 626
 627         return 0;
 628 }
 629
 630 static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
 631         assert(netdev);
 632
 633         if (netdev->state != NETDEV_STATE_LOADING)
 634                 return false;
 635
 636         if (link) {
 637                 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 638                         return false;
 639
 640                 if (netdev_get_create_type(netdev) == NETDEV_CREATE_AFTER_CONFIGURED &&
 641                     link->state != LINK_STATE_CONFIGURED)
 642                         return false;
 643
 644                 if (link->set_link_messages > 0)
 645                         return false;
 646         }
 647
 648         if (NETDEV_VTABLE(netdev)->is_ready_to_create)
 649                 return NETDEV_VTABLE(netdev)->is_ready_to_create(netdev, link);
 650
 651         return true;
 652 }
 653
 654 int request_process_stacked_netdev(Request *req) {
 655         int r;
 656
 657         assert(req);
 658         assert(req->link);
 659         assert(req->type == REQUEST_TYPE_NETDEV_STACKED);
 660         assert(req->netdev);
 661         assert(req->netlink_handler);
 662
 663         r = netdev_is_ready_to_create(req->netdev, req->link);
 664         if (r <= 0)
 665                 return r;
 666
 667         r = netdev_join(req->netdev, req->link, req->netlink_handler);
 668         if (r < 0)
 669                 return log_link_error_errno(req->link, r, "Failed to create stacked netdev '%s': %m", req->netdev->ifname);
 670
 671         return 1;
 672 }
 673
 674 static int link_create_stacked_netdev_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 675         int r;
 676
 677         assert(m);
 678         assert(link);
 679
 680         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 681                 return 0;
 682
 683         r = sd_netlink_message_get_errno(m);
 684         if (r < 0 && r != -EEXIST) {
 685                 log_link_message_warning_errno(link, m, r, "Could not create stacked netdev");
 686                 link_enter_failed(link);
 687                 return 0;
 688         }
 689
 690         return 1;
 691 }
 692
 693 static int link_create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 694         assert(link);
 695         assert(link->create_stacked_netdev_messages > 0);
 696
 697         link->create_stacked_netdev_messages--;
 698
 699         if (link_create_stacked_netdev_handler_internal(rtnl, m, link) <= 0)
 700                 return 0;
 701
 702         if (link->create_stacked_netdev_messages == 0) {
 703                 link->stacked_netdevs_created = true;
 704                 log_link_debug(link, "Stacked netdevs created.");
 705                 link_check_ready(link);
 706         }
 707
 708         return 0;
 709 }
 710
 711 static int link_create_stacked_netdev_after_configured_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 712         assert(link);
 713         assert(link->create_stacked_netdev_after_configured_messages > 0);
 714
 715         link->create_stacked_netdev_after_configured_messages--;
 716
 717         if (link_create_stacked_netdev_handler_internal(rtnl, m, link) <= 0)
 718                 return 0;
 719
 720         if (link->create_stacked_netdev_after_configured_messages == 0) {
 721                 link->stacked_netdevs_after_configured_created = true;
 722                 log_link_debug(link, "Stacked netdevs created.");
 723         }
 724
 725         return 0;
 726 }
 727
 728 int link_request_stacked_netdev(Link *link, NetDev *netdev) {
 729         int r;
 730
 731         assert(link);
 732         assert(netdev);
 733
 734         if (!netdev_is_stacked(netdev))
 735                 return -EINVAL;
 736
 737         if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_FAILED) || netdev->ifindex > 0)
 738                 return 0; /* Already created. */
 739
 740         if (netdev_get_create_type(netdev) == NETDEV_CREATE_STACKED) {
 741                 link->stacked_netdevs_created = false;
 742                 r = link_queue_request(link, REQUEST_TYPE_NETDEV_STACKED, netdev_ref(netdev), true,
 743                                        &link->create_stacked_netdev_messages,
 744                                        link_create_stacked_netdev_handler,
 745                                        NULL);
 746         } else {
 747                 link->stacked_netdevs_after_configured_created = false;
 748                 r = link_queue_request(link, REQUEST_TYPE_NETDEV_STACKED, netdev_ref(netdev), true,
 749                                        &link->create_stacked_netdev_after_configured_messages,
 750                                        link_create_stacked_netdev_after_configured_handler,
 751                                        NULL);
 752         }
 753         if (r < 0)
 754                 return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
 755                                             netdev->ifname);
 756
 757         log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
 758         return 0;
 759 }
 760
 761 int request_process_independent_netdev(Request *req) {
 762         int r;
 763
 764         assert(req);
 765         assert(req->type == REQUEST_TYPE_NETDEV_INDEPENDENT);
 766         assert(req->netdev);
 767
 768         r = netdev_is_ready_to_create(req->netdev, NULL);
 769         if (r <= 0)
 770                 return r;
 771
 772         r = netdev_create(req->netdev, NULL, NULL);
 773         if (r < 0)
 774                 return r;
 775
 776         return 1;
 777 }
 778
 779 static int netdev_request(NetDev *netdev) {
 780         int r;
 781
 782         assert(netdev);
 783
 784         if (!IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_MASTER, NETDEV_CREATE_INDEPENDENT) &&
 785             !netdev_is_stacked_and_independent(netdev))
 786                 return 0;
 787
 788         r = netdev_is_ready_to_create(netdev, NULL);
 789         if (r < 0)
 790                 return r;
 791         if (r > 0)
 792                 /* If the netdev has no dependency, then create it now. */
 793                 return netdev_create(netdev, NULL, NULL);
 794
 795         /* Otherwise, wait for the dependencies being resolved. */
 796         return netdev_queue_request(netdev, NULL);
 797 }
 798
 799 int netdev_load_one(Manager *manager, const char *filename) {
 800         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 801         const char *dropin_dirname;
 802         int r;
 803
 804         assert(manager);
 805         assert(filename);
 806
 807         r = null_or_empty_path(filename);
 808         if (r == -ENOENT)
 809                 return 0;
 810         if (r < 0)
 811                 return r;
 812         if (r > 0) {
 813                 log_debug("Skipping empty file: %s", filename);
 814                 return 0;
 815         }
 816
 817         netdev_raw = new(NetDev, 1);
 818         if (!netdev_raw)
 819                 return log_oom();
 820
 821         *netdev_raw = (NetDev) {
 822                 .n_ref = 1,
 823                 .kind = _NETDEV_KIND_INVALID,
 824                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 825         };
 826
 827         dropin_dirname = strjoina(basename(filename), ".d");
 828         r = config_parse_many(
 829                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 830                         NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
 831                         config_item_perf_lookup, network_netdev_gperf_lookup,
 832                         CONFIG_PARSE_WARN,
 833                         netdev_raw,
 834                         NULL);
 835         if (r < 0)
 836                 return r;
 837
 838         /* skip out early if configuration does not match the environment */
 839         if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
 840                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 841                 return 0;
 842         }
 843
 844         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 845                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 846                 return 0;
 847         }
 848
 849         if (!netdev_raw->ifname) {
 850                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 851                 return 0;
 852         }
 853
 854         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 855         if (!netdev)
 856                 return log_oom();
 857
 858         netdev->n_ref = 1;
 859         netdev->manager = manager;
 860         netdev->kind = netdev_raw->kind;
 861         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 862                                                  so that done() will be called on destruction */
 863
 864         if (NETDEV_VTABLE(netdev)->init)
 865                 NETDEV_VTABLE(netdev)->init(netdev);
 866
 867         r = config_parse_many(
 868                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 869                         NETDEV_VTABLE(netdev)->sections,
 870                         config_item_perf_lookup, network_netdev_gperf_lookup,
 871                         CONFIG_PARSE_WARN,
 872                         netdev, NULL);
 873         if (r < 0)
 874                 return r;
 875
 876         /* verify configuration */
 877         if (NETDEV_VTABLE(netdev)->config_verify) {
 878                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 879                 if (r < 0)
 880                         return 0;
 881         }
 882
 883         netdev->filename = strdup(filename);
 884         if (!netdev->filename)
 885                 return log_oom();
 886
 887         r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
 888         if (r == -ENOMEM)
 889                 return log_oom();
 890         if (r == -EEXIST) {
 891                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 892
 893                 assert(n);
 894                 if (!streq(netdev->filename, n->filename))
 895                         log_netdev_warning_errno(netdev, r,
 896                                                  "Device was already configured by file %s, ignoring %s.",
 897                                                  n->filename, netdev->filename);
 898
 899                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 900                  * removed from the hashmap 'manager->netdevs'. */
 901                 netdev->ifname = mfree(netdev->ifname);
 902                 return 0;
 903         }
 904         if (r < 0)
 905                 return r;
 906
 907         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 908
 909         r = netdev_request(netdev);
 910         if (r < 0)
 911                 return log_netdev_warning_errno(netdev, r, "Failed to request to create: %m");
 912
 913         TAKE_PTR(netdev);
 914         return 0;
 915 }
 916
 917 int netdev_load(Manager *manager, bool reload) {
 918         _cleanup_strv_free_ char **files = NULL;
 919         char **f;
 920         int r;
 921
 922         assert(manager);
 923
 924         if (!reload)
 925                 hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 926
 927         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 928         if (r < 0)
 929                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 930
 931         STRV_FOREACH(f, files) {
 932                 r = netdev_load_one(manager, *f);
 933                 if (r < 0)
 934                         log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
 935         }
 936
 937         return 0;
 938 }
 939
 940 int config_parse_netdev_kind(
 941                 const char *unit,
 942                 const char *filename,
 943                 unsigned line,
 944                 const char *section,
 945                 unsigned section_line,
 946                 const char *lvalue,
 947                 int ltype,
 948                 const char *rvalue,
 949                 void *data,
 950                 void *userdata) {
 951
 952         NetDevKind k, *kind = data;
 953
 954         assert(filename);
 955         assert(rvalue);
 956         assert(data);
 957
 958         k = netdev_kind_from_string(rvalue);
 959         if (k < 0) {
 960                 log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 961                 return 0;
 962         }
 963
 964         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 965                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 966                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 967                            netdev_kind_to_string(*kind), rvalue);
 968                 return 0;
 969         }
 970
 971         *kind = k;
 972
 973         return 0;
 974 }
 975
 976 int config_parse_netdev_hw_addr(
 977                 const char *unit,
 978                 const char *filename,
 979                 unsigned line,
 980                 const char *section,
 981                 unsigned section_line,
 982                 const char *lvalue,
 983                 int ltype,
 984                 const char *rvalue,
 985                 void *data,
 986                 void *userdata) {
 987
 988         struct hw_addr_data *hw_addr = data;
 989
 990         assert(rvalue);
 991         assert(data);
 992
 993         if (streq(rvalue, "none")) {
 994                 *hw_addr = HW_ADDR_NONE;
 995                 return 0;
 996         }
 997
 998         return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
 999 }