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 "xfrm.h"
  51
  52 const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX] = {
  53         [NETDEV_KIND_BAREUDP]   = &bare_udp_vtable,
  54         [NETDEV_KIND_BATADV]    = &batadv_vtable,
  55         [NETDEV_KIND_BOND]      = &bond_vtable,
  56         [NETDEV_KIND_BRIDGE]    = &bridge_vtable,
  57         [NETDEV_KIND_DUMMY]     = &dummy_vtable,
  58         [NETDEV_KIND_ERSPAN]    = &erspan_vtable,
  59         [NETDEV_KIND_FOU]       = &foutnl_vtable,
  60         [NETDEV_KIND_GENEVE]    = &geneve_vtable,
  61         [NETDEV_KIND_GRE]       = &gre_vtable,
  62         [NETDEV_KIND_GRETAP]    = &gretap_vtable,
  63         [NETDEV_KIND_IFB]       = &ifb_vtable,
  64         [NETDEV_KIND_IP6GRE]    = &ip6gre_vtable,
  65         [NETDEV_KIND_IP6GRETAP] = &ip6gretap_vtable,
  66         [NETDEV_KIND_IP6TNL]    = &ip6tnl_vtable,
  67         [NETDEV_KIND_IPIP]      = &ipip_vtable,
  68         [NETDEV_KIND_IPOIB]     = &ipoib_vtable,
  69         [NETDEV_KIND_IPVLAN]    = &ipvlan_vtable,
  70         [NETDEV_KIND_IPVTAP]    = &ipvtap_vtable,
  71         [NETDEV_KIND_L2TP]      = &l2tptnl_vtable,
  72         [NETDEV_KIND_MACSEC]    = &macsec_vtable,
  73         [NETDEV_KIND_MACVLAN]   = &macvlan_vtable,
  74         [NETDEV_KIND_MACVTAP]   = &macvtap_vtable,
  75         [NETDEV_KIND_NETDEVSIM] = &netdevsim_vtable,
  76         [NETDEV_KIND_NLMON]     = &nlmon_vtable,
  77         [NETDEV_KIND_SIT]       = &sit_vtable,
  78         [NETDEV_KIND_TAP]       = &tap_vtable,
  79         [NETDEV_KIND_TUN]       = &tun_vtable,
  80         [NETDEV_KIND_VCAN]      = &vcan_vtable,
  81         [NETDEV_KIND_VETH]      = &veth_vtable,
  82         [NETDEV_KIND_VLAN]      = &vlan_vtable,
  83         [NETDEV_KIND_VRF]       = &vrf_vtable,
  84         [NETDEV_KIND_VTI6]      = &vti6_vtable,
  85         [NETDEV_KIND_VTI]       = &vti_vtable,
  86         [NETDEV_KIND_VXCAN]     = &vxcan_vtable,
  87         [NETDEV_KIND_VXLAN]     = &vxlan_vtable,
  88         [NETDEV_KIND_WIREGUARD] = &wireguard_vtable,
  89         [NETDEV_KIND_XFRM]      = &xfrm_vtable,
  90 };
  91
  92 static const char* const netdev_kind_table[_NETDEV_KIND_MAX] = {
  93         [NETDEV_KIND_BAREUDP]   = "bareudp",
  94         [NETDEV_KIND_BATADV]    = "batadv",
  95         [NETDEV_KIND_BOND]      = "bond",
  96         [NETDEV_KIND_BRIDGE]    = "bridge",
  97         [NETDEV_KIND_DUMMY]     = "dummy",
  98         [NETDEV_KIND_ERSPAN]    = "erspan",
  99         [NETDEV_KIND_FOU]       = "fou",
 100         [NETDEV_KIND_GENEVE]    = "geneve",
 101         [NETDEV_KIND_GRE]       = "gre",
 102         [NETDEV_KIND_GRETAP]    = "gretap",
 103         [NETDEV_KIND_IFB]       = "ifb",
 104         [NETDEV_KIND_IP6GRE]    = "ip6gre",
 105         [NETDEV_KIND_IP6GRETAP] = "ip6gretap",
 106         [NETDEV_KIND_IP6TNL]    = "ip6tnl",
 107         [NETDEV_KIND_IPIP]      = "ipip",
 108         [NETDEV_KIND_IPOIB]     = "ipoib",
 109         [NETDEV_KIND_IPVLAN]    = "ipvlan",
 110         [NETDEV_KIND_IPVTAP]    = "ipvtap",
 111         [NETDEV_KIND_L2TP]      = "l2tp",
 112         [NETDEV_KIND_MACSEC]    = "macsec",
 113         [NETDEV_KIND_MACVLAN]   = "macvlan",
 114         [NETDEV_KIND_MACVTAP]   = "macvtap",
 115         [NETDEV_KIND_NETDEVSIM] = "netdevsim",
 116         [NETDEV_KIND_NLMON]     = "nlmon",
 117         [NETDEV_KIND_SIT]       = "sit",
 118         [NETDEV_KIND_TAP]       = "tap",
 119         [NETDEV_KIND_TUN]       = "tun",
 120         [NETDEV_KIND_VCAN]      = "vcan",
 121         [NETDEV_KIND_VETH]      = "veth",
 122         [NETDEV_KIND_VLAN]      = "vlan",
 123         [NETDEV_KIND_VRF]       = "vrf",
 124         [NETDEV_KIND_VTI6]      = "vti6",
 125         [NETDEV_KIND_VTI]       = "vti",
 126         [NETDEV_KIND_VXCAN]     = "vxcan",
 127         [NETDEV_KIND_VXLAN]     = "vxlan",
 128         [NETDEV_KIND_WIREGUARD] = "wireguard",
 129         [NETDEV_KIND_XFRM]      = "xfrm",
 130 };
 131
 132 DEFINE_STRING_TABLE_LOOKUP(netdev_kind, NetDevKind);
 133
 134 bool netdev_is_managed(NetDev *netdev) {
 135         if (!netdev || !netdev->manager || !netdev->ifname)
 136                 return false;
 137
 138         return hashmap_get(netdev->manager->netdevs, netdev->ifname) == netdev;
 139 }
 140
 141 static bool netdev_is_stacked_and_independent(NetDev *netdev) {
 142         assert(netdev);
 143
 144         if (!IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_STACKED, NETDEV_CREATE_AFTER_CONFIGURED))
 145                 return false;
 146
 147         switch (netdev->kind) {
 148         case NETDEV_KIND_ERSPAN:
 149                 return ERSPAN(netdev)->independent;
 150         case NETDEV_KIND_GRE:
 151                 return GRE(netdev)->independent;
 152         case NETDEV_KIND_GRETAP:
 153                 return GRETAP(netdev)->independent;
 154         case NETDEV_KIND_IP6GRE:
 155                 return IP6GRE(netdev)->independent;
 156         case NETDEV_KIND_IP6GRETAP:
 157                 return IP6GRETAP(netdev)->independent;
 158         case NETDEV_KIND_IP6TNL:
 159                 return IP6TNL(netdev)->independent;
 160         case NETDEV_KIND_IPIP:
 161                 return IPIP(netdev)->independent;
 162         case NETDEV_KIND_SIT:
 163                 return SIT(netdev)->independent;
 164         case NETDEV_KIND_VTI:
 165                 return VTI(netdev)->independent;
 166         case NETDEV_KIND_VTI6:
 167                 return VTI6(netdev)->independent;
 168         case NETDEV_KIND_VXLAN:
 169                 return VXLAN(netdev)->independent;
 170         case NETDEV_KIND_XFRM:
 171                 return XFRM(netdev)->independent;
 172         default:
 173                 return false;
 174         }
 175 }
 176
 177 static bool netdev_is_stacked(NetDev *netdev) {
 178         assert(netdev);
 179
 180         if (!IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_STACKED, NETDEV_CREATE_AFTER_CONFIGURED))
 181                 return false;
 182
 183         if (netdev_is_stacked_and_independent(netdev))
 184                 return false;
 185
 186         return true;
 187 }
 188
 189 static void netdev_detach_from_manager(NetDev *netdev) {
 190         if (netdev->ifname && netdev->manager)
 191                 hashmap_remove(netdev->manager->netdevs, netdev->ifname);
 192 }
 193
 194 static NetDev *netdev_free(NetDev *netdev) {
 195         assert(netdev);
 196
 197         netdev_detach_from_manager(netdev);
 198
 199         free(netdev->filename);
 200
 201         free(netdev->description);
 202         free(netdev->ifname);
 203         condition_free_list(netdev->conditions);
 204
 205         /* Invoke the per-kind done() destructor, but only if the state field is initialized. We conditionalize that
 206          * because we parse .netdev files twice: once to determine the kind (with a short, minimal NetDev structure
 207          * allocation, with no room for per-kind fields), and once to read the kind's properties (with a full,
 208          * comprehensive NetDev structure allocation with enough space for whatever the specific kind needs). Now, in
 209          * the first case we shouldn't try to destruct the per-kind NetDev fields on destruction, in the second case we
 210          * should. We use the state field to discern the two cases: it's _NETDEV_STATE_INVALID on the first "raw"
 211          * call. */
 212         if (netdev->state != _NETDEV_STATE_INVALID &&
 213             NETDEV_VTABLE(netdev) &&
 214             NETDEV_VTABLE(netdev)->done)
 215                 NETDEV_VTABLE(netdev)->done(netdev);
 216
 217         return mfree(netdev);
 218 }
 219
 220 DEFINE_TRIVIAL_REF_UNREF_FUNC(NetDev, netdev, netdev_free);
 221
 222 void netdev_drop(NetDev *netdev) {
 223         if (!netdev)
 224                 return;
 225
 226         if (netdev_is_stacked(netdev)) {
 227                 /* The netdev may be removed due to the underlying device removal, and the device may
 228                  * be re-added later. */
 229                 netdev->state = NETDEV_STATE_LOADING;
 230                 netdev->ifindex = 0;
 231
 232                 log_netdev_debug(netdev, "netdev removed");
 233                 return;
 234         }
 235
 236         netdev->state = NETDEV_STATE_LINGER;
 237
 238         log_netdev_debug(netdev, "netdev removed");
 239
 240         netdev_detach_from_manager(netdev);
 241         netdev_unref(netdev);
 242         return;
 243 }
 244
 245 int netdev_get(Manager *manager, const char *name, NetDev **ret) {
 246         NetDev *netdev;
 247
 248         assert(manager);
 249         assert(name);
 250         assert(ret);
 251
 252         netdev = hashmap_get(manager->netdevs, name);
 253         if (!netdev) {
 254                 *ret = NULL;
 255                 return -ENOENT;
 256         }
 257
 258         *ret = netdev;
 259
 260         return 0;
 261 }
 262
 263 void netdev_enter_failed(NetDev *netdev) {
 264         netdev->state = NETDEV_STATE_FAILED;
 265 }
 266
 267 static int netdev_enter_ready(NetDev *netdev) {
 268         assert(netdev);
 269         assert(netdev->ifname);
 270
 271         if (netdev->state != NETDEV_STATE_CREATING)
 272                 return 0;
 273
 274         netdev->state = NETDEV_STATE_READY;
 275
 276         log_netdev_info(netdev, "netdev ready");
 277
 278         if (NETDEV_VTABLE(netdev)->post_create)
 279                 NETDEV_VTABLE(netdev)->post_create(netdev, NULL, NULL);
 280
 281         return 0;
 282 }
 283
 284 /* callback for netdev's created without a backing Link */
 285 static int netdev_create_handler(sd_netlink *rtnl, sd_netlink_message *m, NetDev *netdev) {
 286         int r;
 287
 288         assert(netdev);
 289         assert(netdev->state != _NETDEV_STATE_INVALID);
 290
 291         r = sd_netlink_message_get_errno(m);
 292         if (r == -EEXIST)
 293                 log_netdev_info(netdev, "netdev exists, using existing without changing its parameters");
 294         else if (r < 0) {
 295                 log_netdev_warning_errno(netdev, r, "netdev could not be created: %m");
 296                 netdev_enter_failed(netdev);
 297
 298                 return 1;
 299         }
 300
 301         log_netdev_debug(netdev, "Created");
 302
 303         return 1;
 304 }
 305
 306 int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *message) {
 307         uint16_t type;
 308         const char *kind;
 309         const char *received_kind;
 310         const char *received_name;
 311         int r, ifindex;
 312
 313         assert(netdev);
 314         assert(message);
 315
 316         r = sd_netlink_message_get_type(message, &type);
 317         if (r < 0)
 318                 return log_netdev_error_errno(netdev, r, "Could not get rtnl message type: %m");
 319
 320         if (type != RTM_NEWLINK)
 321                 return log_netdev_error_errno(netdev, SYNTHETIC_ERRNO(EINVAL), "Cannot set ifindex from unexpected rtnl message type.");
 322
 323         r = sd_rtnl_message_link_get_ifindex(message, &ifindex);
 324         if (r < 0) {
 325                 log_netdev_error_errno(netdev, r, "Could not get ifindex: %m");
 326                 netdev_enter_failed(netdev);
 327                 return r;
 328         } else if (ifindex <= 0) {
 329                 log_netdev_error(netdev, "Got invalid ifindex: %d", ifindex);
 330                 netdev_enter_failed(netdev);
 331                 return -EINVAL;
 332         }
 333
 334         if (netdev->ifindex > 0) {
 335                 if (netdev->ifindex != ifindex) {
 336                         log_netdev_error(netdev, "Could not set ifindex to %d, already set to %d",
 337                                          ifindex, netdev->ifindex);
 338                         netdev_enter_failed(netdev);
 339                         return -EEXIST;
 340                 } else
 341                         /* ifindex already set to the same for this netdev */
 342                         return 0;
 343         }
 344
 345         r = sd_netlink_message_read_string(message, IFLA_IFNAME, &received_name);
 346         if (r < 0)
 347                 return log_netdev_error_errno(netdev, r, "Could not get IFNAME: %m");
 348
 349         if (!streq(netdev->ifname, received_name)) {
 350                 log_netdev_error(netdev, "Received newlink with wrong IFNAME %s", received_name);
 351                 netdev_enter_failed(netdev);
 352                 return -EINVAL;
 353         }
 354
 355         r = sd_netlink_message_enter_container(message, IFLA_LINKINFO);
 356         if (r < 0)
 357                 return log_netdev_error_errno(netdev, r, "Could not get LINKINFO: %m");
 358
 359         r = sd_netlink_message_read_string(message, IFLA_INFO_KIND, &received_kind);
 360         if (r < 0)
 361                 return log_netdev_error_errno(netdev, r, "Could not get KIND: %m");
 362
 363         r = sd_netlink_message_exit_container(message);
 364         if (r < 0)
 365                 return log_netdev_error_errno(netdev, r, "Could not exit container: %m");
 366
 367         if (netdev->kind == NETDEV_KIND_TAP)
 368                 /* the kernel does not distinguish between tun and tap */
 369                 kind = "tun";
 370         else {
 371                 kind = netdev_kind_to_string(netdev->kind);
 372                 if (!kind) {
 373                         log_netdev_error(netdev, "Could not get kind");
 374                         netdev_enter_failed(netdev);
 375                         return -EINVAL;
 376                 }
 377         }
 378
 379         if (!streq(kind, received_kind)) {
 380                 log_netdev_error(netdev, "Received newlink with wrong KIND %s, expected %s",
 381                                  received_kind, kind);
 382                 netdev_enter_failed(netdev);
 383                 return -EINVAL;
 384         }
 385
 386         netdev->ifindex = ifindex;
 387
 388         log_netdev_debug(netdev, "netdev has index %d", netdev->ifindex);
 389
 390         netdev_enter_ready(netdev);
 391
 392         return 0;
 393 }
 394
 395 #define HASH_KEY SD_ID128_MAKE(52,e1,45,bd,00,6f,29,96,21,c6,30,6d,83,71,04,48)
 396
 397 int netdev_generate_hw_addr(
 398                 NetDev *netdev,
 399                 Link *parent,
 400                 const char *name,
 401                 const struct hw_addr_data *hw_addr,
 402                 struct hw_addr_data *ret) {
 403
 404         struct hw_addr_data a = HW_ADDR_NULL;
 405         bool is_static = false;
 406         int r;
 407
 408         assert(netdev);
 409         assert(name);
 410         assert(hw_addr);
 411         assert(ret);
 412
 413         if (hw_addr_equal(hw_addr, &HW_ADDR_NONE)) {
 414                 *ret = HW_ADDR_NULL;
 415                 return 0;
 416         }
 417
 418         if (hw_addr->length == 0) {
 419                 uint64_t result;
 420
 421                 /* HardwareAddress= is not specified. */
 422
 423                 if (!NETDEV_VTABLE(netdev)->generate_mac)
 424                         goto finalize;
 425
 426                 if (!IN_SET(NETDEV_VTABLE(netdev)->iftype, ARPHRD_ETHER, ARPHRD_INFINIBAND))
 427                         goto finalize;
 428
 429                 r = net_get_unique_predictable_data_from_name(name, &HASH_KEY, &result);
 430                 if (r < 0) {
 431                         log_netdev_warning_errno(netdev, r,
 432                                                  "Failed to generate persistent MAC address, ignoring: %m");
 433                         goto finalize;
 434                 }
 435
 436                 a.length = arphrd_to_hw_addr_len(NETDEV_VTABLE(netdev)->iftype);
 437
 438                 switch (NETDEV_VTABLE(netdev)->iftype) {
 439                 case ARPHRD_ETHER:
 440                         assert(a.length <= sizeof(result));
 441                         memcpy(a.bytes, &result, a.length);
 442
 443                         if (ether_addr_is_null(&a.ether) || ether_addr_is_broadcast(&a.ether)) {
 444                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 445                                                          "Failed to generate persistent MAC address, ignoring: %m");
 446                                 a = HW_ADDR_NULL;
 447                                 goto finalize;
 448                         }
 449
 450                         break;
 451                 case ARPHRD_INFINIBAND:
 452                         if (result == 0) {
 453                                 log_netdev_warning_errno(netdev, SYNTHETIC_ERRNO(EINVAL),
 454                                                          "Failed to generate persistent MAC address: %m");
 455                                 goto finalize;
 456                         }
 457
 458                         assert(a.length >= sizeof(result));
 459                         memzero(a.bytes, a.length - sizeof(result));
 460                         memcpy(a.bytes + a.length - sizeof(result), &result, sizeof(result));
 461                         break;
 462                 default:
 463                         assert_not_reached();
 464                 }
 465
 466         } else {
 467                 a = *hw_addr;
 468                 is_static = true;
 469         }
 470
 471         r = net_verify_hardware_address(name, is_static, NETDEV_VTABLE(netdev)->iftype,
 472                                         parent ? &parent->hw_addr : NULL, &a);
 473         if (r < 0)
 474                 return r;
 475
 476 finalize:
 477         *ret = a;
 478         return 0;
 479 }
 480
 481 static int netdev_create_message(NetDev *netdev, Link *link, sd_netlink_message *m) {
 482         int r;
 483
 484         r = sd_netlink_message_append_string(m, IFLA_IFNAME, netdev->ifname);
 485         if (r < 0)
 486                 return r;
 487
 488         struct hw_addr_data hw_addr;
 489         r = netdev_generate_hw_addr(netdev, link, netdev->ifname, &netdev->hw_addr, &hw_addr);
 490         if (r < 0)
 491                 return r;
 492
 493         if (hw_addr.length > 0) {
 494                 log_netdev_debug(netdev, "Using MAC address: %s", HW_ADDR_TO_STR(&hw_addr));
 495                 r = netlink_message_append_hw_addr(m, IFLA_ADDRESS, &hw_addr);
 496                 if (r < 0)
 497                         return r;
 498         }
 499
 500         if (netdev->mtu != 0) {
 501                 r = sd_netlink_message_append_u32(m, IFLA_MTU, netdev->mtu);
 502                 if (r < 0)
 503                         return r;
 504         }
 505
 506         if (link) {
 507                 r = sd_netlink_message_append_u32(m, IFLA_LINK, link->ifindex);
 508                 if (r < 0)
 509                         return r;
 510         }
 511
 512         r = sd_netlink_message_open_container(m, IFLA_LINKINFO);
 513         if (r < 0)
 514                 return r;
 515
 516         if (NETDEV_VTABLE(netdev)->fill_message_create) {
 517                 r = sd_netlink_message_open_container_union(m, IFLA_INFO_DATA, netdev_kind_to_string(netdev->kind));
 518                 if (r < 0)
 519                         return r;
 520
 521                 r = NETDEV_VTABLE(netdev)->fill_message_create(netdev, link, m);
 522                 if (r < 0)
 523                         return r;
 524
 525                 r = sd_netlink_message_close_container(m);
 526                 if (r < 0)
 527                         return r;
 528         } else {
 529                 r = sd_netlink_message_append_string(m, IFLA_INFO_KIND, netdev_kind_to_string(netdev->kind));
 530                 if (r < 0)
 531                         return r;
 532         }
 533
 534         r = sd_netlink_message_close_container(m);
 535         if (r < 0)
 536                 return r;
 537
 538         return 0;
 539 }
 540
 541 static int netdev_create(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 542         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
 543         int r;
 544
 545         assert(netdev);
 546         assert(!link || callback);
 547
 548         /* create netdev */
 549         if (NETDEV_VTABLE(netdev)->create) {
 550                 assert(!link);
 551
 552                 r = NETDEV_VTABLE(netdev)->create(netdev);
 553                 if (r < 0)
 554                         return r;
 555
 556                 log_netdev_debug(netdev, "Created");
 557                 return 0;
 558         }
 559
 560         r = sd_rtnl_message_new_link(netdev->manager->rtnl, &m, RTM_NEWLINK, 0);
 561         if (r < 0)
 562                 return log_netdev_error_errno(netdev, r, "Could not allocate netlink message: %m");
 563
 564         r = netdev_create_message(netdev, link, m);
 565         if (r < 0)
 566                 return log_netdev_error_errno(netdev, r, "Could not create netlink message: %m");
 567
 568         if (link) {
 569                 r = netlink_call_async(netdev->manager->rtnl, NULL, m, callback,
 570                                        link_netlink_destroy_callback, link);
 571                 if (r < 0)
 572                         return log_netdev_error_errno(netdev, r, "Could not send netlink message: %m");
 573
 574                 link_ref(link);
 575         } else {
 576                 r = netlink_call_async(netdev->manager->rtnl, NULL, m, netdev_create_handler,
 577                                        netdev_destroy_callback, netdev);
 578                 if (r < 0)
 579                         return log_netdev_error_errno(netdev, r, "Could not send netlink message: %m");
 580
 581                 netdev_ref(netdev);
 582         }
 583
 584         netdev->state = NETDEV_STATE_CREATING;
 585
 586         log_netdev_debug(netdev, "Creating");
 587         return 0;
 588 }
 589
 590 static int netdev_create_after_configured(NetDev *netdev, Link *link) {
 591         assert(netdev);
 592         assert(link);
 593         assert(NETDEV_VTABLE(netdev)->create_after_configured);
 594
 595         return NETDEV_VTABLE(netdev)->create_after_configured(netdev, link);
 596 }
 597
 598 int netdev_join(NetDev *netdev, Link *link, link_netlink_message_handler_t callback) {
 599         int r;
 600
 601         assert(netdev);
 602         assert(netdev->manager);
 603         assert(netdev->manager->rtnl);
 604
 605         switch (netdev_get_create_type(netdev)) {
 606         case NETDEV_CREATE_STACKED:
 607                 r = netdev_create(netdev, link, callback);
 608                 if (r < 0)
 609                         return r;
 610
 611                 break;
 612         case NETDEV_CREATE_AFTER_CONFIGURED:
 613                 r = netdev_create_after_configured(netdev, link);
 614                 if (r < 0)
 615                         return r;
 616                 break;
 617         default:
 618                 assert_not_reached();
 619         }
 620
 621         return 0;
 622 }
 623
 624 static int netdev_is_ready_to_create(NetDev *netdev, Link *link) {
 625         assert(netdev);
 626
 627         if (netdev->state != NETDEV_STATE_LOADING)
 628                 return false;
 629
 630         if (link) {
 631                 if (!IN_SET(link->state, LINK_STATE_CONFIGURING, LINK_STATE_CONFIGURED))
 632                         return false;
 633
 634                 if (netdev_get_create_type(netdev) == NETDEV_CREATE_AFTER_CONFIGURED &&
 635                     link->state != LINK_STATE_CONFIGURED)
 636                         return false;
 637
 638                 if (link->set_link_messages > 0)
 639                         return false;
 640         }
 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 int request_process_stacked_netdev(Request *req) {
 649         int r;
 650
 651         assert(req);
 652         assert(req->link);
 653         assert(req->type == REQUEST_TYPE_NETDEV_STACKED);
 654         assert(req->netdev);
 655         assert(req->netlink_handler);
 656
 657         r = netdev_is_ready_to_create(req->netdev, req->link);
 658         if (r <= 0)
 659                 return r;
 660
 661         r = netdev_join(req->netdev, req->link, req->netlink_handler);
 662         if (r < 0)
 663                 return log_link_error_errno(req->link, r, "Failed to create stacked netdev '%s': %m", req->netdev->ifname);
 664
 665         return 1;
 666 }
 667
 668 static int link_create_stacked_netdev_handler_internal(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 669         int r;
 670
 671         assert(m);
 672         assert(link);
 673
 674         if (IN_SET(link->state, LINK_STATE_FAILED, LINK_STATE_LINGER))
 675                 return 0;
 676
 677         r = sd_netlink_message_get_errno(m);
 678         if (r < 0 && r != -EEXIST) {
 679                 log_link_message_warning_errno(link, m, r, "Could not create stacked netdev");
 680                 link_enter_failed(link);
 681                 return 0;
 682         }
 683
 684         return 1;
 685 }
 686
 687 static int link_create_stacked_netdev_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 688         assert(link);
 689         assert(link->create_stacked_netdev_messages > 0);
 690
 691         link->create_stacked_netdev_messages--;
 692
 693         if (link_create_stacked_netdev_handler_internal(rtnl, m, link) <= 0)
 694                 return 0;
 695
 696         if (link->create_stacked_netdev_messages == 0) {
 697                 link->stacked_netdevs_created = true;
 698                 log_link_debug(link, "Stacked netdevs created.");
 699                 link_check_ready(link);
 700         }
 701
 702         return 0;
 703 }
 704
 705 static int link_create_stacked_netdev_after_configured_handler(sd_netlink *rtnl, sd_netlink_message *m, Link *link) {
 706         assert(link);
 707         assert(link->create_stacked_netdev_after_configured_messages > 0);
 708
 709         link->create_stacked_netdev_after_configured_messages--;
 710
 711         if (link_create_stacked_netdev_handler_internal(rtnl, m, link) <= 0)
 712                 return 0;
 713
 714         if (link->create_stacked_netdev_after_configured_messages == 0) {
 715                 link->stacked_netdevs_after_configured_created = true;
 716                 log_link_debug(link, "Stacked netdevs created.");
 717         }
 718
 719         return 0;
 720 }
 721
 722 int link_request_stacked_netdev(Link *link, NetDev *netdev) {
 723         int r;
 724
 725         assert(link);
 726         assert(netdev);
 727
 728         if (!netdev_is_stacked(netdev))
 729                 return -EINVAL;
 730
 731         if (!IN_SET(netdev->state, NETDEV_STATE_LOADING, NETDEV_STATE_FAILED) || netdev->ifindex > 0)
 732                 return 0; /* Already created. */
 733
 734         if (netdev_get_create_type(netdev) == NETDEV_CREATE_STACKED) {
 735                 link->stacked_netdevs_created = false;
 736                 r = link_queue_request(link, REQUEST_TYPE_NETDEV_STACKED, netdev_ref(netdev), true,
 737                                        &link->create_stacked_netdev_messages,
 738                                        link_create_stacked_netdev_handler,
 739                                        NULL);
 740         } else {
 741                 link->stacked_netdevs_after_configured_created = false;
 742                 r = link_queue_request(link, REQUEST_TYPE_NETDEV_STACKED, netdev_ref(netdev), true,
 743                                        &link->create_stacked_netdev_after_configured_messages,
 744                                        link_create_stacked_netdev_after_configured_handler,
 745                                        NULL);
 746         }
 747         if (r < 0)
 748                 return log_link_error_errno(link, r, "Failed to request stacked netdev '%s': %m",
 749                                             netdev->ifname);
 750
 751         log_link_debug(link, "Requested stacked netdev '%s'", netdev->ifname);
 752         return 0;
 753 }
 754
 755 int request_process_independent_netdev(Request *req) {
 756         int r;
 757
 758         assert(req);
 759         assert(req->type == REQUEST_TYPE_NETDEV_INDEPENDENT);
 760         assert(req->netdev);
 761
 762         r = netdev_is_ready_to_create(req->netdev, NULL);
 763         if (r <= 0)
 764                 return r;
 765
 766         r = netdev_create(req->netdev, NULL, NULL);
 767         if (r < 0)
 768                 return r;
 769
 770         return 1;
 771 }
 772
 773 static int netdev_request(NetDev *netdev) {
 774         int r;
 775
 776         assert(netdev);
 777
 778         if (!IN_SET(netdev_get_create_type(netdev), NETDEV_CREATE_MASTER, NETDEV_CREATE_INDEPENDENT) &&
 779             !netdev_is_stacked_and_independent(netdev))
 780                 return 0;
 781
 782         r = netdev_is_ready_to_create(netdev, NULL);
 783         if (r < 0)
 784                 return r;
 785         if (r > 0)
 786                 /* If the netdev has no dependency, then create it now. */
 787                 return netdev_create(netdev, NULL, NULL);
 788
 789         /* Otherwise, wait for the dependencies being resolved. */
 790         return netdev_queue_request(netdev, NULL);
 791 }
 792
 793 int netdev_load_one(Manager *manager, const char *filename) {
 794         _cleanup_(netdev_unrefp) NetDev *netdev_raw = NULL, *netdev = NULL;
 795         const char *dropin_dirname;
 796         int r;
 797
 798         assert(manager);
 799         assert(filename);
 800
 801         r = null_or_empty_path(filename);
 802         if (r == -ENOENT)
 803                 return 0;
 804         if (r < 0)
 805                 return r;
 806         if (r > 0) {
 807                 log_debug("Skipping empty file: %s", filename);
 808                 return 0;
 809         }
 810
 811         netdev_raw = new(NetDev, 1);
 812         if (!netdev_raw)
 813                 return log_oom();
 814
 815         *netdev_raw = (NetDev) {
 816                 .n_ref = 1,
 817                 .kind = _NETDEV_KIND_INVALID,
 818                 .state = _NETDEV_STATE_INVALID, /* an invalid state means done() of the implementation won't be called on destruction */
 819         };
 820
 821         dropin_dirname = strjoina(basename(filename), ".d");
 822         r = config_parse_many(
 823                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 824                         NETDEV_COMMON_SECTIONS NETDEV_OTHER_SECTIONS,
 825                         config_item_perf_lookup, network_netdev_gperf_lookup,
 826                         CONFIG_PARSE_WARN,
 827                         netdev_raw,
 828                         NULL);
 829         if (r < 0)
 830                 return r;
 831
 832         /* skip out early if configuration does not match the environment */
 833         if (!condition_test_list(netdev_raw->conditions, environ, NULL, NULL, NULL)) {
 834                 log_debug("%s: Conditions in the file do not match the system environment, skipping.", filename);
 835                 return 0;
 836         }
 837
 838         if (netdev_raw->kind == _NETDEV_KIND_INVALID) {
 839                 log_warning("NetDev has no Kind= configured in %s. Ignoring", filename);
 840                 return 0;
 841         }
 842
 843         if (!netdev_raw->ifname) {
 844                 log_warning("NetDev without Name= configured in %s. Ignoring", filename);
 845                 return 0;
 846         }
 847
 848         netdev = malloc0(NETDEV_VTABLE(netdev_raw)->object_size);
 849         if (!netdev)
 850                 return log_oom();
 851
 852         netdev->n_ref = 1;
 853         netdev->manager = manager;
 854         netdev->kind = netdev_raw->kind;
 855         netdev->state = NETDEV_STATE_LOADING; /* we initialize the state here for the first time,
 856                                                  so that done() will be called on destruction */
 857
 858         if (NETDEV_VTABLE(netdev)->init)
 859                 NETDEV_VTABLE(netdev)->init(netdev);
 860
 861         r = config_parse_many(
 862                         STRV_MAKE_CONST(filename), NETWORK_DIRS, dropin_dirname,
 863                         NETDEV_VTABLE(netdev)->sections,
 864                         config_item_perf_lookup, network_netdev_gperf_lookup,
 865                         CONFIG_PARSE_WARN,
 866                         netdev, NULL);
 867         if (r < 0)
 868                 return r;
 869
 870         /* verify configuration */
 871         if (NETDEV_VTABLE(netdev)->config_verify) {
 872                 r = NETDEV_VTABLE(netdev)->config_verify(netdev, filename);
 873                 if (r < 0)
 874                         return 0;
 875         }
 876
 877         netdev->filename = strdup(filename);
 878         if (!netdev->filename)
 879                 return log_oom();
 880
 881         r = hashmap_ensure_put(&netdev->manager->netdevs, &string_hash_ops, netdev->ifname, netdev);
 882         if (r == -ENOMEM)
 883                 return log_oom();
 884         if (r == -EEXIST) {
 885                 NetDev *n = hashmap_get(netdev->manager->netdevs, netdev->ifname);
 886
 887                 assert(n);
 888                 if (!streq(netdev->filename, n->filename))
 889                         log_netdev_warning_errno(netdev, r,
 890                                                  "Device was already configured by file %s, ignoring %s.",
 891                                                  n->filename, netdev->filename);
 892
 893                 /* Clear ifname before netdev_free() is called. Otherwise, the NetDev object 'n' is
 894                  * removed from the hashmap 'manager->netdevs'. */
 895                 netdev->ifname = mfree(netdev->ifname);
 896                 return 0;
 897         }
 898         if (r < 0)
 899                 return r;
 900
 901         log_netdev_debug(netdev, "loaded %s", netdev_kind_to_string(netdev->kind));
 902
 903         r = netdev_request(netdev);
 904         if (r < 0)
 905                 return log_netdev_warning_errno(netdev, r, "Failed to request to create: %m");
 906
 907         TAKE_PTR(netdev);
 908         return 0;
 909 }
 910
 911 int netdev_load(Manager *manager, bool reload) {
 912         _cleanup_strv_free_ char **files = NULL;
 913         char **f;
 914         int r;
 915
 916         assert(manager);
 917
 918         if (!reload)
 919                 hashmap_clear_with_destructor(manager->netdevs, netdev_unref);
 920
 921         r = conf_files_list_strv(&files, ".netdev", NULL, 0, NETWORK_DIRS);
 922         if (r < 0)
 923                 return log_error_errno(r, "Failed to enumerate netdev files: %m");
 924
 925         STRV_FOREACH(f, files) {
 926                 r = netdev_load_one(manager, *f);
 927                 if (r < 0)
 928                         log_error_errno(r, "Failed to load %s, ignoring: %m", *f);
 929         }
 930
 931         return 0;
 932 }
 933
 934 int config_parse_netdev_kind(
 935                 const char *unit,
 936                 const char *filename,
 937                 unsigned line,
 938                 const char *section,
 939                 unsigned section_line,
 940                 const char *lvalue,
 941                 int ltype,
 942                 const char *rvalue,
 943                 void *data,
 944                 void *userdata) {
 945
 946         NetDevKind k, *kind = data;
 947
 948         assert(filename);
 949         assert(rvalue);
 950         assert(data);
 951
 952         k = netdev_kind_from_string(rvalue);
 953         if (k < 0) {
 954                 log_syntax(unit, LOG_WARNING, filename, line, k, "Failed to parse netdev kind, ignoring assignment: %s", rvalue);
 955                 return 0;
 956         }
 957
 958         if (*kind != _NETDEV_KIND_INVALID && *kind != k) {
 959                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 960                            "Specified netdev kind is different from the previous value '%s', ignoring assignment: %s",
 961                            netdev_kind_to_string(*kind), rvalue);
 962                 return 0;
 963         }
 964
 965         *kind = k;
 966
 967         return 0;
 968 }
 969
 970 int config_parse_netdev_hw_addr(
 971                 const char *unit,
 972                 const char *filename,
 973                 unsigned line,
 974                 const char *section,
 975                 unsigned section_line,
 976                 const char *lvalue,
 977                 int ltype,
 978                 const char *rvalue,
 979                 void *data,
 980                 void *userdata) {
 981
 982         struct hw_addr_data *hw_addr = data;
 983
 984         assert(rvalue);
 985         assert(data);
 986
 987         if (streq(rvalue, "none")) {
 988                 *hw_addr = HW_ADDR_NONE;
 989                 return 0;
 990         }
 991
 992         return config_parse_hw_addr(unit, filename, line, section, section_line, lvalue, ltype, rvalue, data, userdata);
 993 }