net/8021q/vlan.c

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