net/8021q/vlan.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * INET         802.1Q VLAN
   4  *              Ethernet-type device handling.
   5  *
   6  * Authors:     Ben Greear <greearb@candelatech.com>
   7  *              Please send support related email to: netdev@vger.kernel.org
   8  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   9  *
  10  * Fixes:
  11  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  12  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  13  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  14  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/capability.h>
  20 #include <linux/module.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/slab.h>
  24 #include <linux/init.h>
  25 #include <linux/rculist.h>
  26 #include <net/p8022.h>
  27 #include <net/arp.h>
  28 #include <linux/rtnetlink.h>
  29 #include <linux/notifier.h>
  30 #include <net/rtnetlink.h>
  31 #include <net/net_namespace.h>
  32 #include <net/netns/generic.h>
  33 #include <linux/uaccess.h>
  34
  35 #include <linux/if_vlan.h>
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38
  39 #define DRV_VERSION "1.8"
  40
  41 /* Global VLAN variables */
  42
  43 unsigned int vlan_net_id __read_mostly;
  44
  45 const char vlan_fullname[] = "802.1Q VLAN Support";
  46 const char vlan_version[] = DRV_VERSION;
  47
  48 /* End of global variables definitions. */
  49
  50 static int vlan_group_prealloc_vid(struct vlan_group *vg,
  51                                    __be16 vlan_proto, u16 vlan_id)
  52 {
  53         struct net_device **array;
  54         unsigned int pidx, vidx;
  55         unsigned int size;
  56
  57         ASSERT_RTNL();
  58
  59         pidx  = vlan_proto_idx(vlan_proto);
  60         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
  61         array = vg->vlan_devices_arrays[pidx][vidx];
  62         if (array != NULL)
  63                 return 0;
  64
  65         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
  66         array = kzalloc(size, GFP_KERNEL);
  67         if (array == NULL)
  68                 return -ENOBUFS;
  69
  70         vg->vlan_devices_arrays[pidx][vidx] = array;
  71         return 0;
  72 }
  73
  74 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
  75                                             struct net_device *dev,
  76                                             struct vlan_dev_priv *vlan)
  77 {
  78         if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
  79                 netif_stacked_transfer_operstate(rootdev, dev);
  80 }
  81
  82 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  83 {
  84         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  85         struct net_device *real_dev = vlan->real_dev;
  86         struct vlan_info *vlan_info;
  87         struct vlan_group *grp;
  88         u16 vlan_id = vlan->vlan_id;
  89
  90         ASSERT_RTNL();
  91
  92         vlan_info = rtnl_dereference(real_dev->vlan_info);
  93         BUG_ON(!vlan_info);
  94
  95         grp = &vlan_info->grp;
  96
  97         grp->nr_vlan_devs--;
  98
  99         if (vlan->flags & VLAN_FLAG_MVRP)
 100                 vlan_mvrp_request_leave(dev);
 101         if (vlan->flags & VLAN_FLAG_GVRP)
 102                 vlan_gvrp_request_leave(dev);
 103
 104         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 105
 106         netdev_upper_dev_unlink(real_dev, dev);
 107         /* Because unregister_netdevice_queue() makes sure at least one rcu
 108          * grace period is respected before device freeing,
 109          * we dont need to call synchronize_net() here.
 110          */
 111         unregister_netdevice_queue(dev, head);
 112
 113         if (grp->nr_vlan_devs == 0) {
 114                 vlan_mvrp_uninit_applicant(real_dev);
 115                 vlan_gvrp_uninit_applicant(real_dev);
 116         }
 117
 118         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 119 }
 120
 121 int vlan_check_real_dev(struct net_device *real_dev,
 122                         __be16 protocol, u16 vlan_id,
 123                         struct netlink_ext_ack *extack)
 124 {
 125         const char *name = real_dev->name;
 126
 127         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 128                 pr_info("VLANs not supported on %s\n", name);
 129                 NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
 130                 return -EOPNOTSUPP;
 131         }
 132
 133         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
 134                 NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 135                 return -EEXIST;
 136         }
 137
 138         return 0;
 139 }
 140
 141 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
 142 {
 143         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 144         struct net_device *real_dev = vlan->real_dev;
 145         u16 vlan_id = vlan->vlan_id;
 146         struct vlan_info *vlan_info;
 147         struct vlan_group *grp;
 148         int err;
 149
 150         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 151         if (err)
 152                 return err;
 153
 154         vlan_info = rtnl_dereference(real_dev->vlan_info);
 155         /* vlan_info should be there now. vlan_vid_add took care of it */
 156         BUG_ON(!vlan_info);
 157
 158         grp = &vlan_info->grp;
 159         if (grp->nr_vlan_devs == 0) {
 160                 err = vlan_gvrp_init_applicant(real_dev);
 161                 if (err < 0)
 162                         goto out_vid_del;
 163                 err = vlan_mvrp_init_applicant(real_dev);
 164                 if (err < 0)
 165                         goto out_uninit_gvrp;
 166         }
 167
 168         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 169         if (err < 0)
 170                 goto out_uninit_mvrp;
 171
 172         err = register_netdevice(dev);
 173         if (err < 0)
 174                 goto out_uninit_mvrp;
 175
 176         err = netdev_upper_dev_link(real_dev, dev, extack);
 177         if (err)
 178                 goto out_unregister_netdev;
 179
 180         vlan_stacked_transfer_operstate(real_dev, dev, vlan);
 181         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 182
 183         /* So, got the sucker initialized, now lets place
 184          * it into our local structure.
 185          */
 186         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 187         grp->nr_vlan_devs++;
 188
 189         return 0;
 190
 191 out_unregister_netdev:
 192         unregister_netdevice(dev);
 193 out_uninit_mvrp:
 194         if (grp->nr_vlan_devs == 0)
 195                 vlan_mvrp_uninit_applicant(real_dev);
 196 out_uninit_gvrp:
 197         if (grp->nr_vlan_devs == 0)
 198                 vlan_gvrp_uninit_applicant(real_dev);
 199 out_vid_del:
 200         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 201         return err;
 202 }
 203
 204 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 205  *  Returns 0 if the device was created or a negative error code otherwise.
 206  */
 207 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 208 {
 209         struct net_device *new_dev;
 210         struct vlan_dev_priv *vlan;
 211         struct net *net = dev_net(real_dev);
 212         struct vlan_net *vn = net_generic(net, vlan_net_id);
 213         char name[IFNAMSIZ];
 214         int err;
 215
 216         if (vlan_id >= VLAN_VID_MASK)
 217                 return -ERANGE;
 218
 219         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
 220                                   NULL);
 221         if (err < 0)
 222                 return err;
 223
 224         /* Gotta set up the fields for the device. */
 225         switch (vn->name_type) {
 226         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 227                 /* name will look like:  eth1.0005 */
 228                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 229                 break;
 230         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 231                 /* Put our vlan.VID in the name.
 232                  * Name will look like:  vlan5
 233                  */
 234                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 235                 break;
 236         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 237                 /* Put our vlan.VID in the name.
 238                  * Name will look like:  eth0.5
 239                  */
 240                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 241                 break;
 242         case VLAN_NAME_TYPE_PLUS_VID:
 243                 /* Put our vlan.VID in the name.
 244                  * Name will look like:  vlan0005
 245                  */
 246         default:
 247                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 248         }
 249
 250         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
 251                                NET_NAME_UNKNOWN, vlan_setup);
 252
 253         if (new_dev == NULL)
 254                 return -ENOBUFS;
 255
 256         dev_net_set(new_dev, net);
 257         /* need 4 bytes for extra VLAN header info,
 258          * hope the underlying device can handle it.
 259          */
 260         new_dev->mtu = real_dev->mtu;
 261
 262         vlan = vlan_dev_priv(new_dev);
 263         vlan->vlan_proto = htons(ETH_P_8021Q);
 264         vlan->vlan_id = vlan_id;
 265         vlan->real_dev = real_dev;
 266         vlan->dent = NULL;
 267         vlan->flags = VLAN_FLAG_REORDER_HDR;
 268
 269         new_dev->rtnl_link_ops = &vlan_link_ops;
 270         err = register_vlan_dev(new_dev, NULL);
 271         if (err < 0)
 272                 goto out_free_newdev;
 273
 274         return 0;
 275
 276 out_free_newdev:
 277         if (new_dev->reg_state == NETREG_UNINITIALIZED ||
 278             new_dev->reg_state == NETREG_UNREGISTERED)
 279                 free_netdev(new_dev);
 280         return err;
 281 }
 282
 283 static void vlan_sync_address(struct net_device *dev,
 284                               struct net_device *vlandev)
 285 {
 286         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 287
 288         /* May be called without an actual change */
 289         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 290                 return;
 291
 292         /* vlan continues to inherit address of lower device */
 293         if (vlan_dev_inherit_address(vlandev, dev))
 294                 goto out;
 295
 296         /* vlan address was different from the old address and is equal to
 297          * the new address */
 298         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 299             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 300                 dev_uc_del(dev, vlandev->dev_addr);
 301
 302         /* vlan address was equal to the old address and is different from
 303          * the new address */
 304         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 305             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 306                 dev_uc_add(dev, vlandev->dev_addr);
 307
 308 out:
 309         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 310 }
 311
 312 static void vlan_transfer_features(struct net_device *dev,
 313                                    struct net_device *vlandev)
 314 {
 315         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 316
 317         vlandev->gso_max_size = dev->gso_max_size;
 318         vlandev->gso_max_segs = dev->gso_max_segs;
 319
 320         if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
 321                 vlandev->hard_header_len = dev->hard_header_len;
 322         else
 323                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 324
 325 #if IS_ENABLED(CONFIG_FCOE)
 326         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 327 #endif
 328
 329         vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
 330         vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
 331         vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
 332
 333         netdev_update_features(vlandev);
 334 }
 335
 336 static int __vlan_device_event(struct net_device *dev, unsigned long event)
 337 {
 338         int err = 0;
 339
 340         switch (event) {
 341         case NETDEV_CHANGENAME:
 342                 vlan_proc_rem_dev(dev);
 343                 err = vlan_proc_add_dev(dev);
 344                 break;
 345         case NETDEV_REGISTER:
 346                 err = vlan_proc_add_dev(dev);
 347                 break;
 348         case NETDEV_UNREGISTER:
 349                 vlan_proc_rem_dev(dev);
 350                 break;
 351         }
 352
 353         return err;
 354 }
 355
 356 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 357                              void *ptr)
 358 {
 359         struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
 360         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 361         struct vlan_group *grp;
 362         struct vlan_info *vlan_info;
 363         int i, flgs;
 364         struct net_device *vlandev;
 365         struct vlan_dev_priv *vlan;
 366         bool last = false;
 367         LIST_HEAD(list);
 368         int err;
 369
 370         if (is_vlan_dev(dev)) {
 371                 int err = __vlan_device_event(dev, event);
 372
 373                 if (err)
 374                         return notifier_from_errno(err);
 375         }
 376
 377         if ((event == NETDEV_UP) &&
 378             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 379                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 380                         dev->name);
 381                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 382         }
 383         if (event == NETDEV_DOWN &&
 384             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
 385                 vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 386
 387         vlan_info = rtnl_dereference(dev->vlan_info);
 388         if (!vlan_info)
 389                 goto out;
 390         grp = &vlan_info->grp;
 391
 392         /* It is OK that we do not hold the group lock right now,
 393          * as we run under the RTNL lock.
 394          */
 395
 396         switch (event) {
 397         case NETDEV_CHANGE:
 398                 /* Propagate real device state to vlan devices */
 399                 vlan_group_for_each_dev(grp, i, vlandev)
 400                         vlan_stacked_transfer_operstate(dev, vlandev,
 401                                                         vlan_dev_priv(vlandev));
 402                 break;
 403
 404         case NETDEV_CHANGEADDR:
 405                 /* Adjust unicast filters on underlying device */
 406                 vlan_group_for_each_dev(grp, i, vlandev) {
 407                         flgs = vlandev->flags;
 408                         if (!(flgs & IFF_UP))
 409                                 continue;
 410
 411                         vlan_sync_address(dev, vlandev);
 412                 }
 413                 break;
 414
 415         case NETDEV_CHANGEMTU:
 416                 vlan_group_for_each_dev(grp, i, vlandev) {
 417                         if (vlandev->mtu <= dev->mtu)
 418                                 continue;
 419
 420                         dev_set_mtu(vlandev, dev->mtu);
 421                 }
 422                 break;
 423
 424         case NETDEV_FEAT_CHANGE:
 425                 /* Propagate device features to underlying device */
 426                 vlan_group_for_each_dev(grp, i, vlandev)
 427                         vlan_transfer_features(dev, vlandev);
 428                 break;
 429
 430         case NETDEV_DOWN: {
 431                 struct net_device *tmp;
 432                 LIST_HEAD(close_list);
 433
 434                 /* Put all VLANs for this dev in the down state too.  */
 435                 vlan_group_for_each_dev(grp, i, vlandev) {
 436                         flgs = vlandev->flags;
 437                         if (!(flgs & IFF_UP))
 438                                 continue;
 439
 440                         vlan = vlan_dev_priv(vlandev);
 441                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 442                                 list_add(&vlandev->close_list, &close_list);
 443                 }
 444
 445                 dev_close_many(&close_list, false);
 446
 447                 list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
 448                         vlan_stacked_transfer_operstate(dev, vlandev,
 449                                                         vlan_dev_priv(vlandev));
 450                         list_del_init(&vlandev->close_list);
 451                 }
 452                 list_del(&close_list);
 453                 break;
 454         }
 455         case NETDEV_UP:
 456                 /* Put all VLANs for this dev in the up state too.  */
 457                 vlan_group_for_each_dev(grp, i, vlandev) {
 458                         flgs = dev_get_flags(vlandev);
 459                         if (flgs & IFF_UP)
 460                                 continue;
 461
 462                         vlan = vlan_dev_priv(vlandev);
 463                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 464                                 dev_change_flags(vlandev, flgs | IFF_UP,
 465                                                  extack);
 466                         vlan_stacked_transfer_operstate(dev, vlandev, vlan);
 467                 }
 468                 break;
 469
 470         case NETDEV_UNREGISTER:
 471                 /* twiddle thumbs on netns device moves */
 472                 if (dev->reg_state != NETREG_UNREGISTERING)
 473                         break;
 474
 475                 vlan_group_for_each_dev(grp, i, vlandev) {
 476                         /* removal of last vid destroys vlan_info, abort
 477                          * afterwards */
 478                         if (vlan_info->nr_vids == 1)
 479                                 last = true;
 480
 481                         unregister_vlan_dev(vlandev, &list);
 482                         if (last)
 483                                 break;
 484                 }
 485                 unregister_netdevice_many(&list);
 486                 break;
 487
 488         case NETDEV_PRE_TYPE_CHANGE:
 489                 /* Forbid underlaying device to change its type. */
 490                 if (vlan_uses_dev(dev))
 491                         return NOTIFY_BAD;
 492                 break;
 493
 494         case NETDEV_NOTIFY_PEERS:
 495         case NETDEV_BONDING_FAILOVER:
 496         case NETDEV_RESEND_IGMP:
 497                 /* Propagate to vlan devices */
 498                 vlan_group_for_each_dev(grp, i, vlandev)
 499                         call_netdevice_notifiers(event, vlandev);
 500                 break;
 501
 502         case NETDEV_CVLAN_FILTER_PUSH_INFO:
 503                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
 504                 if (err)
 505                         return notifier_from_errno(err);
 506                 break;
 507
 508         case NETDEV_CVLAN_FILTER_DROP_INFO:
 509                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
 510                 break;
 511
 512         case NETDEV_SVLAN_FILTER_PUSH_INFO:
 513                 err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
 514                 if (err)
 515                         return notifier_from_errno(err);
 516                 break;
 517
 518         case NETDEV_SVLAN_FILTER_DROP_INFO:
 519                 vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
 520                 break;
 521         }
 522
 523 out:
 524         return NOTIFY_DONE;
 525 }
 526
 527 static struct notifier_block vlan_notifier_block __read_mostly = {
 528         .notifier_call = vlan_device_event,
 529 };
 530
 531 /*
 532  *      VLAN IOCTL handler.
 533  *      o execute requested action or pass command to the device driver
 534  *   arg is really a struct vlan_ioctl_args __user *.
 535  */
 536 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 537 {
 538         int err;
 539         struct vlan_ioctl_args args;
 540         struct net_device *dev = NULL;
 541
 542         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 543                 return -EFAULT;
 544
 545         /* Null terminate this sucker, just in case. */
 546         args.device1[sizeof(args.device1) - 1] = 0;
 547         args.u.device2[sizeof(args.u.device2) - 1] = 0;
 548
 549         rtnl_lock();
 550
 551         switch (args.cmd) {
 552         case SET_VLAN_INGRESS_PRIORITY_CMD:
 553         case SET_VLAN_EGRESS_PRIORITY_CMD:
 554         case SET_VLAN_FLAG_CMD:
 555         case ADD_VLAN_CMD:
 556         case DEL_VLAN_CMD:
 557         case GET_VLAN_REALDEV_NAME_CMD:
 558         case GET_VLAN_VID_CMD:
 559                 err = -ENODEV;
 560                 dev = __dev_get_by_name(net, args.device1);
 561                 if (!dev)
 562                         goto out;
 563
 564                 err = -EINVAL;
 565                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 566                         goto out;
 567         }
 568
 569         switch (args.cmd) {
 570         case SET_VLAN_INGRESS_PRIORITY_CMD:
 571                 err = -EPERM;
 572                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 573                         break;
 574                 vlan_dev_set_ingress_priority(dev,
 575                                               args.u.skb_priority,
 576                                               args.vlan_qos);
 577                 err = 0;
 578                 break;
 579
 580         case SET_VLAN_EGRESS_PRIORITY_CMD:
 581                 err = -EPERM;
 582                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 583                         break;
 584                 err = vlan_dev_set_egress_priority(dev,
 585                                                    args.u.skb_priority,
 586                                                    args.vlan_qos);
 587                 break;
 588
 589         case SET_VLAN_FLAG_CMD:
 590                 err = -EPERM;
 591                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 592                         break;
 593                 err = vlan_dev_change_flags(dev,
 594                                             args.vlan_qos ? args.u.flag : 0,
 595                                             args.u.flag);
 596                 break;
 597
 598         case SET_VLAN_NAME_TYPE_CMD:
 599                 err = -EPERM;
 600                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 601                         break;
 602                 if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 603                         struct vlan_net *vn;
 604
 605                         vn = net_generic(net, vlan_net_id);
 606                         vn->name_type = args.u.name_type;
 607                         err = 0;
 608                 } else {
 609                         err = -EINVAL;
 610                 }
 611                 break;
 612
 613         case ADD_VLAN_CMD:
 614                 err = -EPERM;
 615                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 616                         break;
 617                 err = register_vlan_device(dev, args.u.VID);
 618                 break;
 619
 620         case DEL_VLAN_CMD:
 621                 err = -EPERM;
 622                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 623                         break;
 624                 unregister_vlan_dev(dev, NULL);
 625                 err = 0;
 626                 break;
 627
 628         case GET_VLAN_REALDEV_NAME_CMD:
 629                 err = 0;
 630                 vlan_dev_get_realdev_name(dev, args.u.device2);
 631                 if (copy_to_user(arg, &args,
 632                                  sizeof(struct vlan_ioctl_args)))
 633                         err = -EFAULT;
 634                 break;
 635
 636         case GET_VLAN_VID_CMD:
 637                 err = 0;
 638                 args.u.VID = vlan_dev_vlan_id(dev);
 639                 if (copy_to_user(arg, &args,
 640                                  sizeof(struct vlan_ioctl_args)))
 641                       err = -EFAULT;
 642                 break;
 643
 644         default:
 645                 err = -EOPNOTSUPP;
 646                 break;
 647         }
 648 out:
 649         rtnl_unlock();
 650         return err;
 651 }
 652
 653 static int __net_init vlan_init_net(struct net *net)
 654 {
 655         struct vlan_net *vn = net_generic(net, vlan_net_id);
 656         int err;
 657
 658         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 659
 660         err = vlan_proc_init(net);
 661
 662         return err;
 663 }
 664
 665 static void __net_exit vlan_exit_net(struct net *net)
 666 {
 667         vlan_proc_cleanup(net);
 668 }
 669
 670 static struct pernet_operations vlan_net_ops = {
 671         .init = vlan_init_net,
 672         .exit = vlan_exit_net,
 673         .id   = &vlan_net_id,
 674         .size = sizeof(struct vlan_net),
 675 };
 676
 677 static int __init vlan_proto_init(void)
 678 {
 679         int err;
 680
 681         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 682
 683         err = register_pernet_subsys(&vlan_net_ops);
 684         if (err < 0)
 685                 goto err0;
 686
 687         err = register_netdevice_notifier(&vlan_notifier_block);
 688         if (err < 0)
 689                 goto err2;
 690
 691         err = vlan_gvrp_init();
 692         if (err < 0)
 693                 goto err3;
 694
 695         err = vlan_mvrp_init();
 696         if (err < 0)
 697                 goto err4;
 698
 699         err = vlan_netlink_init();
 700         if (err < 0)
 701                 goto err5;
 702
 703         vlan_ioctl_set(vlan_ioctl_handler);
 704         return 0;
 705
 706 err5:
 707         vlan_mvrp_uninit();
 708 err4:
 709         vlan_gvrp_uninit();
 710 err3:
 711         unregister_netdevice_notifier(&vlan_notifier_block);
 712 err2:
 713         unregister_pernet_subsys(&vlan_net_ops);
 714 err0:
 715         return err;
 716 }
 717
 718 static void __exit vlan_cleanup_module(void)
 719 {
 720         vlan_ioctl_set(NULL);
 721
 722         vlan_netlink_fini();
 723
 724         unregister_netdevice_notifier(&vlan_notifier_block);
 725
 726         unregister_pernet_subsys(&vlan_net_ops);
 727         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 728
 729         vlan_mvrp_uninit();
 730         vlan_gvrp_uninit();
 731 }
 732
 733 module_init(vlan_proto_init);
 734 module_exit(vlan_cleanup_module);
 735
 736 MODULE_LICENSE("GPL");
 737 MODULE_VERSION(DRV_VERSION);