src/network/netdev/netdev.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 /* Make sure the net/if.h header is included before any linux/ one */
   4 #include <net/if.h>
   5 #include <netinet/in.h>
   6 #include <linux/if_arp.h>
   7 #include <unistd.h>
   8
   9 #include "alloc-util.h"
  10 #include "arphrd-util.h"
  11 #include "bareudp.h"
  12 #include "batadv.h"
  13 #include "bond.h"
  14 #include "bridge.h"
  15 #include "conf-files.h"
  16 #include "conf-parser.h"
  17 #include "dummy.h"
  18 #include "fd-util.h"
  19 #include "fou-tunnel.h"
  20 #include "geneve.h"
  21 #include "ifb.h"
  22 #include "ipoib.h"
  23 #include "ipvlan.h"
  24 #include "l2tp-tunnel.h"
  25 #include "list.h"
  26 #include "macsec.h"
  27 #include "macvlan.h"
  28 #include "netdev.h"
  29 #include "netdevsim.h"
  30 #include "netif-util.h"
  31 #include "netlink-util.h"
  32 #include "networkd-manager.h"
  33 #include "networkd-queue.h"
  34 #include "networkd-setlink.h"
  35 #include "networkd-sriov.h"
  36 #include "nlmon.h"
  37 #include "path-lookup.h"
  38 #include "siphash24.h"
  39 #include "stat-util.h"
  40 #include "string-table.h"
  41 #include "string-util.h"
  42 #include "strv.h"
  43 #include "tunnel.h"
  44 #include "tuntap.h"
  45 #include "vcan.h"
  46 #include "veth.h"
  47 #include "vlan.h"
  48 #include "vrf.h"
  49 #include "vxcan.h"
  50 #include "vxlan.h"
  51 #include "wireguard.h"
  52 #include "wlan.h"
  53 #include "xfrm.h"
  54
  55 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  56         [NETDEV_KIND_BAREUDP]   = &bare_udp_vtable,
  57         [NETDEV_KIND_BATADV]    = &batadv_vtable,
  58         [NETDEV_KIND_BOND]      = &bond_vtable,
  59         [NETDEV_KIND_BRIDGE]    = &bridge_vtable,
  60         [NETDEV_KIND_DUMMY]     = &dummy_vtable,
  61         [NETDEV_KIND_ERSPAN]    = &erspan_vtable,
  62         [NETDEV_KIND_FOU]       = &foutnl_vtable,
  63         [NETDEV_KIND_GENEVE]    = &geneve_vtable,
  64         [NETDEV_KIND_GRE]       = &gre_vtable,
  65         [NETDEV_KIND_GRETAP]    = &gretap_vtable,
  66         [NETDEV_KIND_IFB]       = &ifb_vtable,
  67         [NETDEV_KIND_IP6GRE]    = &ip6gre_vtable,
  68         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  69         [NETDEV_KIND_IP6TNL]    = &ip6tnl_vtable,
  70         [NETDEV_KIND_IPIP]      = &ipip_vtable,
  71         [NETDEV_KIND_IPOIB]     = &ipoib_vtable,
  72         [NETDEV_KIND_IPVLAN]    = &ipvlan_vtable,
  73         [NETDEV_KIND_IPVTAP]    = &ipvtap_vtable,
  74         [NETDEV_KIND_L2TP]      = &l2tptnl_vtable,
  75         [NETDEV_KIND_MACSEC]    = &macsec_vtable,
  76         [NETDEV_KIND_MACVLAN]   = &macvlan_vtable,
  77         [NETDEV_KIND_MACVTAP]   = &macvtap_vtable,
  78         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  79         [NETDEV_KIND_NLMON]     = &nlmon_vtable,
  80         [NETDEV_KIND_SIT]       = &sit_vtable,
  81         [NETDEV_KIND_TAP]       = &tap_vtable,
  82         [NETDEV_KIND_TUN]       = &tun_vtable,
  83         [NETDEV_KIND_VCAN]      = &vcan_vtable,
  84         [NETDEV_KIND_VETH]      = &veth_vtable,
  85         [NETDEV_KIND_VLAN]      = &vlan_vtable,
  86         [NETDEV_KIND_VRF]       = &vrf_vtable,
  87         [NETDEV_KIND_VTI6]      = &vti6_vtable,
  88         [NETDEV_KIND_VTI]       = &vti_vtable,
  89         [NETDEV_KIND_VXCAN]     = &vxcan_vtable,
  90         [NETDEV_KIND_VXLAN]     = &vxlan_vtable,
  91         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  92         [NETDEV_KIND_WLAN]      = &wlan_vtable,
  93         [NETDEV_KIND_XFRM]      = &xfrm_vtable,
  94 };
  95
  96 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  97         [NETDEV_KIND_BAREUDP]   = "bareudp",
  98         [NETDEV_KIND_BATADV]    = "batadv",
  99         [NETDEV_KIND_BOND]      = "bond",
 100         [NETDEV_KIND_BRIDGE]    = "bridge",
 101         [NETDEV_KIND_DUMMY]     = "dummy",
 102         [NETDEV_KIND_ERSPAN]    = "erspan",
 103         [NETDEV_KIND_FOU]       = "fou",
 104         [NETDEV_KIND_GENEVE]    = "geneve",
 105         [NETDEV_KIND_GRE]       = "gre",
 106         [NETDEV_KIND_GRETAP]    = "gretap",
 107         [NETDEV_KIND_IFB]       = "ifb",
 108         [NETDEV_KIND_IP6GRE]    = "ip6gre",
 109         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
 110         [NETDEV_KIND_IP6TNL]    = "ip6tnl",
 111         [NETDEV_KIND_IPIP]      = "ipip",
 112         [NETDEV_KIND_IPOIB]     = "ipoib",
 113         [NETDEV_KIND_IPVLAN]    = "ipvlan",
 114         [NETDEV_KIND_IPVTAP]    = "ipvtap",
 115         [NETDEV_KIND_L2TP]      = "l2tp",
 116         [NETDEV_KIND_MACSEC]    = "macsec",
 117         [NETDEV_KIND_MACVLAN]   = "macvlan",
 118         [NETDEV_KIND_MACVTAP]   = "macvtap",
 119         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 120         [NETDEV_KIND_NLMON]     = "nlmon",
 121         [NETDEV_KIND_SIT]       = "sit",
 122         [NETDEV_KIND_TAP]       = "tap",
 123         [NETDEV_KIND_TUN]       = "tun",
 124         [NETDEV_KIND_VCAN]      = "vcan",
 125         [NETDEV_KIND_VETH]      = "veth",
 126         [NETDEV_KIND_VLAN]      = "vlan",
 127         [NETDEV_KIND_VRF]       = "vrf",
 128         [NETDEV_KIND_VTI6]      = "vti6",
 129         [NETDEV_KIND_VTI]       = "vti",
 130         [NETDEV_KIND_VXCAN]     = "vxcan",
 131         [NETDEV_KIND_VXLAN]     = "vxlan",
 132         [NETDEV_KIND_WIREGUARD] = "wireguard",
 133         [NETDEV_KIND_WLAN]      = "wlan",
 134         [NETDEV_KIND_XFRM]      = "xfrm",
 135 };
 136
 137 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 138
 139 bool netdev_is_managed(NetDev *netdev) {
 140         if (!netdev || !netdev->manager || !netdev->ifname)
 141                 return false;
 142
 143         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 144 }
 145
 146 static bool netdev_is_stacked_and_independent(NetDev *netdev) {
 147         assert(netdev);
 148
 149         if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
 150                 return false;
 151
 152         switch (netdev->kind) {
 153         case NETDEV_KIND_ERSPAN:
 154                 return ERSPAN(netdev)->independent;
 155         case NETDEV_KIND_GRE:
 156                 return GRE(netdev)->independent;
 157         case NETDEV_KIND_GRETAP:
 158                 return GRETAP(netdev)->independent;
 159         case NETDEV_KIND_IP6GRE:
 160                 return IP6GRE(netdev)->independent;
 161         case NETDEV_KIND_IP6GRETAP:
 162                 return IP6GRETAP(netdev)->independent;
 163         case NETDEV_KIND_IP6TNL:
 164                 return IP6TNL(netdev)->independent;
 165         case NETDEV_KIND_IPIP:
 166                 return IPIP(netdev)->independent;
 167         case NETDEV_KIND_SIT:
 168                 return SIT(netdev)->independent;
 169         case NETDEV_KIND_VTI:
 170                 return VTI(netdev)->independent;
 171         case NETDEV_KIND_VTI6:
 172                 return VTI6(netdev)->independent;
 173         case NETDEV_KIND_VXLAN:
 174                 return VXLAN(netdev)->independent;
 175         case NETDEV_KIND_XFRM:
 176                 return XFRM(netdev)->independent;
 177         default:
 178                 return false;
 179         }
 180 }
 181
 182 static bool netdev_is_stacked(NetDev *netdev) {
 183         assert(netdev);
 184
 185         if (netdev_get_create_type(netdev) != NETDEV_CREATE_STACKED)
 186                 return false;
 187
 188         if (netdev_is_stacked_and_independent(netdev))
 189                 return false;
 190
 191         return true;
 192 }
 193
 194 static void netdev_detach_from_manager(NetDev *netdev) {
 195         if (netdev->ifname && netdev->manager)
 196                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 197 }
 198
 199 static NetDev *netdev_free(NetDev *netdev) {
 200         assert(netdev);
 201
 202         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 203          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 204          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 205          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 206          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 207          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 208          * call. */
 209         if (netdev->state != _NETDEV_STATE_INVALID &&
 210             NETDEV_VTABLE(netdev) &&
 211             NETDEV_VTABLE(netdev)->done)
 212                 NETDEV_VTABLE(netdev)->done(netdev);
 213
 214         netdev_detach_from_manager(netdev);
 215
 216         condition_free_list(netdev->conditions);
 217         free(netdev->filename);
 218         free(netdev->description);
 219         free(netdev->ifname);
 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         if (NETDEV_VTABLE(netdev) && NETDEV_VTABLE(netdev)->drop)
 241                 NETDEV_VTABLE(netdev)->drop(netdev);
 242
 243         netdev->state = NETDEV_STATE_LINGER;
 244
 245         log_netdev_debug(netdev, "netdev removed");
 246
 247         netdev_detach_from_manager(netdev);
 248         netdev_unref(netdev);
 249         return;
 250 }
 251
 252 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 253         NetDev *netdev;
 254
 255         assert(manager);
 256         assert(name);
 257         assert(ret);
 258
 259         netdev = hashmap_get(manager->netdevs, name);
 260         if (!netdev)
 261                 return -ENOENT;
 262
 263         *ret = netdev;
 264
 265         return 0;
 266 }
 267
 268 void netdev_enter_failed(NetDev *netdev) {
 269         netdev->state = NETDEV_STATE_FAILED;
 270 }
 271
 272 static int netdev_enter_ready(NetDev *netdev) {
 273         assert(netdev);
 274         assert(netdev->ifname);
 275
 276         if (netdev->state != NETDEV_STATE_CREATING)
 277                 return 0;
 278
 279         netdev->state = NETDEV_STATE_READY;
 280
 281         log_netdev_info(netdev, "netdev ready");
 282
 283         if (NETDEV_VTABLE(netdev)->post_create)
 284                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL);
 285
 286         return 0;
 287 }
 288
 289 /* callback for netdev's created without a backing Link */
 290 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 291         int r;
 292
 293         assert(netdev);
 294         assert(netdev->state != _NETDEV_STATE_INVALID);
 295
 296         r = sd_netlink_message_get_errno(m);
 297         if (r == -EEXIST)
 298                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 299         else if (r < 0) {
 300                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 301                 netdev_enter_failed(netdev);
 302
 303                 return 1;
 304         }
 305
 306         log_netdev_debug(netdev, "Created");
 307
 308         return 1;
 309 }
 310
 311 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 312         uint16_t type;
 313         const char *kind;
 314         const char *received_kind;
 315         const char *received_name;
 316         int r, ifindex;
 317
 318         assert(netdev);
 319         assert(message);
 320
 321         r = sd_netlink_message_get_type(message, &type);
 322         if (r < 0)
 323                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 324
 325         if (type != RTM_NEWLINK)
 326                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
 327
 328         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 329         if (r < 0) {
 330                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 331                 netdev_enter_failed(netdev);
 332                 return r;
 333         } else if (ifindex <= 0) {
 334                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 335                 netdev_enter_failed(netdev);
 336                 return -EINVAL;
 337         }
 338
 339         if (netdev->ifindex > 0) {
 340                 if (netdev->ifindex != ifindex) {
 341                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 342                                          ifindex, netdev->ifindex);
 343                         netdev_enter_failed(netdev);
 344                         return -EEXIST;
 345                 } else
 346                         /* ifindex already set to the same for this netdev */
 347                         return 0;
 348         }
 349
 350         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 351         if (r < 0)
 352                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 353
 354         if (!streq(netdev->ifname, received_name)) {
 355                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 356                 netdev_enter_failed(netdev);
 357                 return -EINVAL;
 358         }
 359
 360         if (!NETDEV_VTABLE(netdev)->skip_netdev_kind_check) {
 361
 362                 r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 363                 if (r < 0)
 364                         return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 365
 366                 r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 367                 if (r < 0)
 368                         return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 369
 370                 r = sd_netlink_message_exit_container(message);
 371                 if (r < 0)
 372                         return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 373
 374                 if (netdev->kind == NETDEV_KIND_TAP)
 375                         /* the kernel does not distinguish between tun and tap */
 376                         kind = "tun";
 377                 else {
 378                         kind = netdev_kind_to_string(netdev->kind);
 379                         if (!kind) {
 380                                 log_netdev_error(netdev, "Could not get kind");
 381                                 netdev_enter_failed(netdev);
 382                                 return -EINVAL;
 383                         }
 384                 }
 385
 386                 if (!streq(kind, received_kind)) {
 387                         log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
 388                                          received_kind, kind);
 389                         netdev_enter_failed(netdev);
 390                         return -EINVAL;
 391                 }
 392         }
 393
 394         netdev->ifindex = ifindex;
 395
 396         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 397
 398         netdev_enter_ready(netdev);
 399
 400         return 0;
 401 }
 402
 403 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 404
 405 int netdev_generate_hw_addr(
 406                 NetDev *netdev,
 407                 Link *parent,
 408                 const char *name,
 409                 const struct hw_addr_data *hw_addr,
 410                 struct hw_addr_data *ret) {
 411
 412         struct hw_addr_data a = HW_ADDR_NULL;
 413         bool is_static = false;
 414         int r;
 415
 416         assert(netdev);
 417         assert(name);
 418         assert(hw_addr);
 419         assert(ret);
 420
 421         if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
 422                 *ret = HW_ADDR_NULL;
 423                 return 0;
 424         }
 425
 426         if (hw_addr->length == 0) {
 427                 uint64_t result;
 428
 429                 /* HardwareAddress= is not specified. */
 430
 431                 if (!NETDEV_VTABLE(netdev)->generate_mac)
 432                         goto finalize;
 433
 434                 if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
 435                         goto finalize;
 436
 437                 r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
 438                 if (r < 0) {
 439                         log_netdev_warning_errno(netdev, r,
 440                                                  "Failed to generate persistent MAC address, ignoring: %m");
 441                         goto finalize;
 442                 }
 443
 444                 a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
 445
 446                 switch (NETDEV_VTABLE(netdev)->iftype) {
 447                 case ARPHRD_ETHER:
 448                         assert(a.length <= sizeof(result));
 449                         memcpy(a.bytes, &result, a.length);
 450
 451                         if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
 452                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 453                                                          "Failed to generate persistent MAC address, ignoring: %m");
 454                                 a = HW_ADDR_NULL;
 455                                 goto finalize;
 456                         }
 457
 458                         break;
 459                 case ARPHRD_INFINIBAND:
 460                         if (result == 0) {
 461                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 462                                                          "Failed to generate persistent MAC address: %m");
 463                                 goto finalize;
 464                         }
 465
 466                         assert(a.length >= sizeof(result));
 467                         memzero(a.bytes, a.length - sizeof(result));
 468                         memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
 469                         break;
 470                 default:
 471                         assert_not_reached();
 472                 }
 473
 474         } else {
 475                 a = *hw_addr;
 476                 is_static = true;
 477         }
 478
 479         r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
 480                                         parent ? &parent->hw_addr : NULL, &a);
 481         if (r < 0)
 482                 return r;
 483
 484 finalize:
 485         *ret = a;
 486         return 0;
 487 }
 488
 489 static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
 490         int r;
 491
 492         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 493         if (r < 0)
 494                 return r;
 495
 496         struct hw_addr_data hw_addr;
 497         r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
 498         if (r < 0)
 499                 return r;
 500
 501         if (hw_addr.length > 0) {
 502                 log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
 503                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
 504                 if (r < 0)
 505                         return r;
 506         }
 507
 508         if (netdev->mtu != 0) {
 509                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 510                 if (r < 0)
 511                         return r;
 512         }
 513
 514         if (link) {
 515                 r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 516                 if (r < 0)
 517                         return r;
 518         }
 519
 520         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 521         if (r < 0)
 522                 return r;
 523
 524         if (NETDEV_VTABLE(netdev)->fill_message_create) {
 525                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 526                 if (r < 0)
 527                         return r;
 528
 529                 r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 530                 if (r < 0)
 531                         return r;
 532
 533                 r = sd_netlink_message_close_container(m);
 534                 if (r < 0)
 535                         return r;
 536         } else {
 537                 r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
 538                 if (r < 0)
 539                         return r;
 540         }
 541
 542         r = sd_netlink_message_close_container(m);
 543         if (r < 0)
 544                 return r;
 545
 546         return 0;
 547 }
 548
 549 static int independent_netdev_create(NetDev *netdev) {
 550         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 551         int r;
 552
 553         assert(netdev);
 554
 555         /* create netdev */
 556         if (NETDEV_VTABLE(netdev)->create) {
 557                 r = NETDEV_VTABLE(netdev)->create(netdev);
 558                 if (r < 0)
 559                         return r;
 560
 561                 log_netdev_debug(netdev, "Created");
 562                 return 0;
 563         }
 564
 565         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 566         if (r < 0)
 567                 return r;
 568
 569         r = netdev_create_message(netdev, NULL, m);
 570         if (r < 0)
 571                 return r;
 572
 573         r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 574                                netdev_destroy_callback, netdev);
 575         if (r < 0)
 576                 return r;
 577
 578         netdev_ref(netdev);
 579
 580         netdev->state = NETDEV_STATE_CREATING;
 581         log_netdev_debug(netdev, "Creating");
 582         return 0;
 583 }
 584
 585 static int stacked_netdev_create(NetDev *netdev, Link *link, Request *req) {
 586         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 587         int r;
 588
 589         assert(netdev);
 590         assert(netdev->manager);
 591         assert(link);
 592         assert(req);
 593
 594         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 595         if (r < 0)
 596                 return r;
 597
 598         r = netdev_create_message(netdev, link, m);
 599         if (r < 0)
 600                 return r;
 601
 602         r = request_call_netlink_async(netdev->manager->rtnl, m, req);
 603         if (r < 0)
 604                 return r;
 605
 606         netdev->state = NETDEV_STATE_CREATING;
 607         log_netdev_debug(netdev, "Creating");
 608         return 0;
 609 }
 610
 611 static bool link_is_ready_to_create_stacked_netdev_one(Link *link, bool allow_unmanaged) {
 612         assert(link);
 613
 614         if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED, LINK_STATE_UNMANAGED))
 615                 return false;
 616
 617         if (!link->network)
 618                 return allow_unmanaged;
 619
 620         if (link->set_link_messages > 0)
 621                 return false;
 622
 623         /* If stacked netdevs are created before the underlying interface being activated, then
 624          * the activation policy for the netdevs are ignored. See issue #22593. */
 625         if (!link->activated)
 626                 return false;
 627
 628         return true;
 629 }
 630
 631 static bool link_is_ready_to_create_stacked_netdev(Link *link) {
 632         return check_ready_for_all_sr_iov_ports(link, /* allow_unmanaged = */ false,
 633                                                 link_is_ready_to_create_stacked_netdev_one);
 634 }
 635
 636 static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
 637         assert(netdev);
 638
 639         if (netdev->state != NETDEV_STATE_LOADING)
 640                 return false;
 641
 642         if (link && !link_is_ready_to_create_stacked_netdev(link))
 643                 return false;
 644
 645         if (NETDEV_VTABLE(netdev)->is_ready_to_create)
 646                 return NETDEV_VTABLE(netdev)->is_ready_to_create(netdev, link);
 647
 648         return true;
 649 }
 650
 651 static int stacked_netdev_process_request(Request *req, Link *link, void *userdata) {
 652         NetDev *netdev = ASSERT_PTR(userdata);
 653         int r;
 654
 655         assert(req);
 656         assert(link);
 657
 658         r = netdev_is_ready_to_create(netdev, link);
 659         if (r <= 0)
 660                 return r;
 661
 662         r = stacked_netdev_create(netdev, link, req);
 663         if (r < 0)
 664                 return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 665
 666         return 1;
 667 }
 668
 669 static int create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Request *req, Link *link, void *userdata) {
 670         int r;
 671
 672         assert(m);
 673         assert(link);
 674
 675         r = sd_netlink_message_get_errno(m);
 676         if (r < 0 && r != -EEXIST) {
 677                 log_link_message_warning_errno(link, m, r, "Could not create stacked netdev");
 678                 link_enter_failed(link);
 679                 return 0;
 680         }
 681
 682         if (link->create_stacked_netdev_messages == 0) {
 683                 link->stacked_netdevs_created = true;
 684                 log_link_debug(link, "Stacked netdevs created.");
 685                 link_check_ready(link);
 686         }
 687
 688         return 0;
 689 }
 690
 691 int link_request_stacked_netdev(Link *link, NetDev *netdev) {
 692         int r;
 693
 694         assert(link);
 695         assert(netdev);
 696
 697         if (!netdev_is_stacked(netdev))
 698                 return -EINVAL;
 699
 700         if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_FAILED) || netdev->ifindex > 0)
 701                 return 0; /* Already created. */
 702
 703         link->stacked_netdevs_created = false;
 704         r = link_queue_request_full(link, REQUEST_TYPE_NETDEV_STACKED,
 705                                     netdev, (mfree_func_t) netdev_unref,
 706                                     trivial_hash_func, trivial_compare_func,
 707                                     stacked_netdev_process_request,
 708                                     &link->create_stacked_netdev_messages,
 709                                     create_stacked_netdev_handler, NULL);
 710         if (r < 0)
 711                 return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
 712                                             netdev->ifname);
 713         if (r == 0)
 714                 return 0;
 715
 716         netdev_ref(netdev);
 717         log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
 718         return 1;
 719 }
 720
 721 static int independent_netdev_process_request(Request *req, Link *link, void *userdata) {
 722         NetDev *netdev = ASSERT_PTR(userdata);
 723         int r;
 724
 725         assert(!link);
 726
 727         r = netdev_is_ready_to_create(netdev, NULL);
 728         if (r <= 0)
 729                 return r;
 730
 731         r = independent_netdev_create(netdev);
 732         if (r < 0)
 733                 return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 734
 735         return 1;
 736 }
 737
 738 static int netdev_request_to_create(NetDev *netdev) {
 739         int r;
 740
 741         assert(netdev);
 742         assert(netdev->manager);
 743
 744         if (netdev->manager->test_mode)
 745                 return 0;
 746
 747         if (netdev_is_stacked(netdev))
 748                 return 0;
 749
 750         r = netdev_is_ready_to_create(netdev, NULL);
 751         if (r < 0)
 752                 return r;
 753         if (r > 0) {
 754                 /* If the netdev has no dependency, then create it now. */
 755                 r = independent_netdev_create(netdev);
 756                 if (r < 0)
 757                         return log_netdev_warning_errno(netdev, r, "Failed to create netdev: %m");
 758
 759         } else {
 760                 /* Otherwise, wait for the dependencies being resolved. */
 761                 r = netdev_queue_request(netdev, independent_netdev_process_request, NULL);
 762                 if (r < 0)
 763                         return log_netdev_warning_errno(netdev, r, "Failed to request to create netdev: %m");
 764         }
 765
 766         return 0;
 767 }
 768
 769 int netdev_load_one(Manager *manager, const char *filename) {
 770         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 771         const char *dropin_dirname;
 772         int r;
 773
 774         assert(manager);
 775         assert(filename);
 776
 777         r = null_or_empty_path(filename);
 778         if (r < 0)
 779                 return log_warning_errno(r, "Failed to check if \"%s\" is empty: %m", filename);
 780         if (r > 0) {
 781                 log_debug("Skipping empty file: %s", filename);
 782                 return 0;
 783         }
 784
 785         netdev_raw = new(NetDev, 1);
 786         if (!netdev_raw)
 787                 return log_oom();
 788
 789         *netdev_raw = (NetDev) {
 790                 .n_ref = 1,
 791                 .kind = _NETDEV_KIND_INVALID,
 792                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 793         };
 794
 795         dropin_dirname = strjoina(basename(filename), ".d");
 796         r = config_parse_many(
 797                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname, /* root = */ NULL,
 798                         NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
 799                         config_item_perf_lookup, network_netdev_gperf_lookup,
 800                         CONFIG_PARSE_WARN,
 801                         netdev_raw,
 802                         NULL,
 803                         NULL);
 804         if (r < 0)
 805                 return r; /* config_parse_many() logs internally. */
 806
 807         /* skip out early if configuration does not match the environment */
 808         if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
 809                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 810                 return 0;
 811         }
 812
 813         if (netdev_raw->kind == _NETDEV_KIND_INVALID)
 814                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev has no Kind= configured in \"%s\", ignoring.", filename);
 815
 816         if (!netdev_raw->ifname)
 817                 return log_warning_errno(SYNTHETIC_ERRNO(EINVAL), "NetDev without Name= configured in \"%s\", ignoring.", filename);
 818
 819         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 820         if (!netdev)
 821                 return log_oom();
 822
 823         netdev->n_ref = 1;
 824         netdev->manager = manager;
 825         netdev->kind = netdev_raw->kind;
 826         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 827                                                  so that done() will be called on destruction */
 828
 829         if (NETDEV_VTABLE(netdev)->init)
 830                 NETDEV_VTABLE(netdev)->init(netdev);
 831
 832         r = config_parse_many(
 833                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname, /* root = */ NULL,
 834                         NETDEV_VTABLE(netdev)->sections,
 835                         config_item_perf_lookup, network_netdev_gperf_lookup,
 836                         CONFIG_PARSE_WARN,
 837                         netdev, NULL, NULL);
 838         if (r < 0)
 839                 return r; /* config_parse_many() logs internally. */
 840
 841         /* verify configuration */
 842         if (NETDEV_VTABLE(netdev)->config_verify) {
 843                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 844                 if (r < 0)
 845                         return r; /* config_verify() logs internally. */
 846         }
 847
 848         netdev->filename = strdup(filename);
 849         if (!netdev->filename)
 850                 return log_oom();
 851
 852         r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
 853         if (r == -ENOMEM)
 854                 return log_oom();
 855         if (r == -EEXIST) {
 856                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 857
 858                 assert(n);
 859                 if (!streq(netdev->filename, n->filename))
 860                         log_netdev_warning_errno(netdev, r,
 861                                                  "Device was already configured by \"%s\", ignoring %s.",
 862                                                  n->filename, netdev->filename);
 863
 864                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 865                  * removed from the hashmap 'manager->netdevs'. */
 866                 netdev->ifname = mfree(netdev->ifname);
 867                 return -EEXIST;
 868         }
 869         assert(r > 0);
 870
 871         log_netdev_debug(netdev, "loaded \"%s\"", netdev_kind_to_string(netdev->kind));
 872
 873         r = netdev_request_to_create(netdev);
 874         if (r < 0)
 875                 return r; /* netdev_request_to_create() logs internally. */
 876
 877         TAKE_PTR(netdev);
 878         return 0;
 879 }
 880
 881 int netdev_load(Manager *manager, bool reload) {
 882         _cleanup_strv_free_ char **files = NULL;
 883         int r;
 884
 885         assert(manager);
 886
 887         if (!reload)
 888                 hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 889
 890         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 891         if (r < 0)
 892                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 893
 894         STRV_FOREACH(f, files)
 895                 (void) netdev_load_one(manager, *f);
 896
 897         return 0;
 898 }
 899
 900 int config_parse_netdev_kind(
 901                 const char *unit,
 902                 const char *filename,
 903                 unsigned line,
 904                 const char *section,
 905                 unsigned section_line,
 906                 const char *lvalue,
 907                 int ltype,
 908                 const char *rvalue,
 909                 void *data,
 910                 void *userdata) {
 911
 912         NetDevKind k, *kind = ASSERT_PTR(data);
 913
 914         assert(filename);
 915         assert(rvalue);
 916
 917         k = netdev_kind_from_string(rvalue);
 918         if (k < 0) {
 919                 log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 920                 return 0;
 921         }
 922
 923         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 924                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 925                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 926                            netdev_kind_to_string(*kind), rvalue);
 927                 return 0;
 928         }
 929
 930         *kind = k;
 931
 932         return 0;
 933 }
 934
 935 int config_parse_netdev_hw_addr(
 936                 const char *unit,
 937                 const char *filename,
 938                 unsigned line,
 939                 const char *section,
 940                 unsigned section_line,
 941                 const char *lvalue,
 942                 int ltype,
 943                 const char *rvalue,
 944                 void *data,
 945                 void *userdata) {
 946
 947         struct hw_addr_data *hw_addr = ASSERT_PTR(data);
 948
 949         assert(rvalue);
 950
 951         if (streq(rvalue, "none")) {
 952                 *hw_addr = HW_ADDR_NONE;
 953                 return 0;
 954         }
 955
 956         return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
 957 }