Pileus Git - ~andy/linux/blob - 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
 246         vlan_dev_priv(new_dev)->vlan_id = vlan_id;
 247         vlan_dev_priv(new_dev)->real_dev = real_dev;
 248         vlan_dev_priv(new_dev)->dent = NULL;
 249         vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 250
 251         new_dev->rtnl_link_ops = &vlan_link_ops;
 252         err = register_vlan_dev(new_dev);
 253         if (err < 0)
 254                 goto out_free_newdev;
 255
 256         return 0;
 257
 258 out_free_newdev:
 259         free_netdev(new_dev);
 260         return err;
 261 }
 262
 263 static void vlan_sync_address(struct net_device *dev,
 264                               struct net_device *vlandev)
 265 {
 266         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 267
 268         /* May be called without an actual change */
 269         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 270                 return;
 271
 272         /* vlan address was different from the old address and is equal to
 273          * the new address */
 274         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 275             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 276                 dev_uc_del(dev, vlandev->dev_addr);
 277
 278         /* vlan address was equal to the old address and is different from
 279          * the new address */
 280         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 281             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 282                 dev_uc_add(dev, vlandev->dev_addr);
 283
 284         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 285 }
 286
 287 static void vlan_transfer_features(struct net_device *dev,
 288                                    struct net_device *vlandev)
 289 {
 290         vlandev->gso_max_size = dev->gso_max_size;
 291
 292         if (dev->features & NETIF_F_HW_VLAN_TX)
 293                 vlandev->hard_header_len = dev->hard_header_len;
 294         else
 295                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 296
 297 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 298         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 299 #endif
 300
 301         netdev_update_features(vlandev);
 302 }
 303
 304 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 305 {
 306         switch (event) {
 307         case NETDEV_CHANGENAME:
 308                 vlan_proc_rem_dev(dev);
 309                 if (vlan_proc_add_dev(dev) < 0)
 310                         pr_warn("failed to change proc name for %s\n",
 311                                 dev->name);
 312                 break;
 313         case NETDEV_REGISTER:
 314                 if (vlan_proc_add_dev(dev) < 0)
 315                         pr_warn("failed to add proc entry for %s\n", dev->name);
 316                 break;
 317         case NETDEV_UNREGISTER:
 318                 vlan_proc_rem_dev(dev);
 319                 break;
 320         }
 321 }
 322
 323 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 324                              void *ptr)
 325 {
 326         struct net_device *dev = ptr;
 327         struct vlan_group *grp;
 328         struct vlan_info *vlan_info;
 329         int i, flgs;
 330         struct net_device *vlandev;
 331         struct vlan_dev_priv *vlan;
 332         LIST_HEAD(list);
 333
 334         if (is_vlan_dev(dev))
 335                 __vlan_device_event(dev, event);
 336
 337         if ((event == NETDEV_UP) &&
 338             (dev->features & NETIF_F_HW_VLAN_FILTER)) {
 339                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 340                         dev->name);
 341                 vlan_vid_add(dev, 0);
 342         }
 343
 344         vlan_info = rtnl_dereference(dev->vlan_info);
 345         if (!vlan_info)
 346                 goto out;
 347         grp = &vlan_info->grp;
 348
 349         /* It is OK that we do not hold the group lock right now,
 350          * as we run under the RTNL lock.
 351          */
 352
 353         switch (event) {
 354         case NETDEV_CHANGE:
 355                 /* Propagate real device state to vlan devices */
 356                 for (i = 0; i < VLAN_N_VID; i++) {
 357                         vlandev = vlan_group_get_device(grp, i);
 358                         if (!vlandev)
 359                                 continue;
 360
 361                         netif_stacked_transfer_operstate(dev, vlandev);
 362                 }
 363                 break;
 364
 365         case NETDEV_CHANGEADDR:
 366                 /* Adjust unicast filters on underlying device */
 367                 for (i = 0; i < VLAN_N_VID; i++) {
 368                         vlandev = vlan_group_get_device(grp, i);
 369                         if (!vlandev)
 370                                 continue;
 371
 372                         flgs = vlandev->flags;
 373                         if (!(flgs & IFF_UP))
 374                                 continue;
 375
 376                         vlan_sync_address(dev, vlandev);
 377                 }
 378                 break;
 379
 380         case NETDEV_CHANGEMTU:
 381                 for (i = 0; i < VLAN_N_VID; i++) {
 382                         vlandev = vlan_group_get_device(grp, i);
 383                         if (!vlandev)
 384                                 continue;
 385
 386                         if (vlandev->mtu <= dev->mtu)
 387                                 continue;
 388
 389                         dev_set_mtu(vlandev, dev->mtu);
 390                 }
 391                 break;
 392
 393         case NETDEV_FEAT_CHANGE:
 394                 /* Propagate device features to underlying device */
 395                 for (i = 0; i < VLAN_N_VID; i++) {
 396                         vlandev = vlan_group_get_device(grp, i);
 397                         if (!vlandev)
 398                                 continue;
 399
 400                         vlan_transfer_features(dev, vlandev);
 401                 }
 402
 403                 break;
 404
 405         case NETDEV_DOWN:
 406                 /* Put all VLANs for this dev in the down state too.  */
 407                 for (i = 0; i < VLAN_N_VID; i++) {
 408                         vlandev = vlan_group_get_device(grp, i);
 409                         if (!vlandev)
 410                                 continue;
 411
 412                         flgs = vlandev->flags;
 413                         if (!(flgs & IFF_UP))
 414                                 continue;
 415
 416                         vlan = vlan_dev_priv(vlandev);
 417                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 418                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 419                         netif_stacked_transfer_operstate(dev, vlandev);
 420                 }
 421                 break;
 422
 423         case NETDEV_UP:
 424                 /* Put all VLANs for this dev in the up state too.  */
 425                 for (i = 0; i < VLAN_N_VID; i++) {
 426                         vlandev = vlan_group_get_device(grp, i);
 427                         if (!vlandev)
 428                                 continue;
 429
 430                         flgs = vlandev->flags;
 431                         if (flgs & IFF_UP)
 432                                 continue;
 433
 434                         vlan = vlan_dev_priv(vlandev);
 435                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 436                                 dev_change_flags(vlandev, flgs | IFF_UP);
 437                         netif_stacked_transfer_operstate(dev, vlandev);
 438                 }
 439                 break;
 440
 441         case NETDEV_UNREGISTER:
 442                 /* twiddle thumbs on netns device moves */
 443                 if (dev->reg_state != NETREG_UNREGISTERING)
 444                         break;
 445
 446                 for (i = 0; i < VLAN_N_VID; i++) {
 447                         vlandev = vlan_group_get_device(grp, i);
 448                         if (!vlandev)
 449                                 continue;
 450
 451                         /* removal of last vid destroys vlan_info, abort
 452                          * afterwards */
 453                         if (vlan_info->nr_vids == 1)
 454                                 i = VLAN_N_VID;
 455
 456                         unregister_vlan_dev(vlandev, &list);
 457                 }
 458                 unregister_netdevice_many(&list);
 459                 break;
 460
 461         case NETDEV_PRE_TYPE_CHANGE:
 462                 /* Forbid underlaying device to change its type. */
 463                 return NOTIFY_BAD;
 464
 465         case NETDEV_NOTIFY_PEERS:
 466         case NETDEV_BONDING_FAILOVER:
 467                 /* Propagate to vlan devices */
 468                 for (i = 0; i < VLAN_N_VID; i++) {
 469                         vlandev = vlan_group_get_device(grp, i);
 470                         if (!vlandev)
 471                                 continue;
 472
 473                         call_netdevice_notifiers(event, vlandev);
 474                 }
 475                 break;
 476         }
 477
 478 out:
 479         return NOTIFY_DONE;
 480 }
 481
 482 static struct notifier_block vlan_notifier_block __read_mostly = {
 483         .notifier_call = vlan_device_event,
 484 };
 485
 486 /*
 487  *      VLAN IOCTL handler.
 488  *      o execute requested action or pass command to the device driver
 489  *   arg is really a struct vlan_ioctl_args __user *.
 490  */
 491 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 492 {
 493         int err;
 494         struct vlan_ioctl_args args;
 495         struct net_device *dev = NULL;
 496
 497         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 498                 return -EFAULT;
 499
 500         /* Null terminate this sucker, just in case. */
 501         args.device1[23] = 0;
 502         args.u.device2[23] = 0;
 503
 504         rtnl_lock();
 505
 506         switch (args.cmd) {
 507         case SET_VLAN_INGRESS_PRIORITY_CMD:
 508         case SET_VLAN_EGRESS_PRIORITY_CMD:
 509         case SET_VLAN_FLAG_CMD:
 510         case ADD_VLAN_CMD:
 511         case DEL_VLAN_CMD:
 512         case GET_VLAN_REALDEV_NAME_CMD:
 513         case GET_VLAN_VID_CMD:
 514                 err = -ENODEV;
 515                 dev = __dev_get_by_name(net, args.device1);
 516                 if (!dev)
 517                         goto out;
 518
 519                 err = -EINVAL;
 520                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 521                         goto out;
 522         }
 523
 524         switch (args.cmd) {
 525         case SET_VLAN_INGRESS_PRIORITY_CMD:
 526                 err = -EPERM;
 527                 if (!capable(CAP_NET_ADMIN))
 528                         break;
 529                 vlan_dev_set_ingress_priority(dev,
 530                                               args.u.skb_priority,
 531                                               args.vlan_qos);
 532                 err = 0;
 533                 break;
 534
 535         case SET_VLAN_EGRESS_PRIORITY_CMD:
 536                 err = -EPERM;
 537                 if (!capable(CAP_NET_ADMIN))
 538                         break;
 539                 err = vlan_dev_set_egress_priority(dev,
 540                                                    args.u.skb_priority,
 541                                                    args.vlan_qos);
 542                 break;
 543
 544         case SET_VLAN_FLAG_CMD:
 545                 err = -EPERM;
 546                 if (!capable(CAP_NET_ADMIN))
 547                         break;
 548                 err = vlan_dev_change_flags(dev,
 549                                             args.vlan_qos ? args.u.flag : 0,
 550                                             args.u.flag);
 551                 break;
 552
 553         case SET_VLAN_NAME_TYPE_CMD:
 554                 err = -EPERM;
 555                 if (!capable(CAP_NET_ADMIN))
 556                         break;
 557                 if ((args.u.name_type >= 0) &&
 558                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 559                         struct vlan_net *vn;
 560
 561                         vn = net_generic(net, vlan_net_id);
 562                         vn->name_type = args.u.name_type;
 563                         err = 0;
 564                 } else {
 565                         err = -EINVAL;
 566                 }
 567                 break;
 568
 569         case ADD_VLAN_CMD:
 570                 err = -EPERM;
 571                 if (!capable(CAP_NET_ADMIN))
 572                         break;
 573                 err = register_vlan_device(dev, args.u.VID);
 574                 break;
 575
 576         case DEL_VLAN_CMD:
 577                 err = -EPERM;
 578                 if (!capable(CAP_NET_ADMIN))
 579                         break;
 580                 unregister_vlan_dev(dev, NULL);
 581                 err = 0;
 582                 break;
 583
 584         case GET_VLAN_REALDEV_NAME_CMD:
 585                 err = 0;
 586                 vlan_dev_get_realdev_name(dev, args.u.device2);
 587                 if (copy_to_user(arg, &args,
 588                                  sizeof(struct vlan_ioctl_args)))
 589                         err = -EFAULT;
 590                 break;
 591
 592         case GET_VLAN_VID_CMD:
 593                 err = 0;
 594                 args.u.VID = vlan_dev_vlan_id(dev);
 595                 if (copy_to_user(arg, &args,
 596                                  sizeof(struct vlan_ioctl_args)))
 597                       err = -EFAULT;
 598                 break;
 599
 600         default:
 601                 err = -EOPNOTSUPP;
 602                 break;
 603         }
 604 out:
 605         rtnl_unlock();
 606         return err;
 607 }
 608
 609 static int __net_init vlan_init_net(struct net *net)
 610 {
 611         struct vlan_net *vn = net_generic(net, vlan_net_id);
 612         int err;
 613
 614         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 615
 616         err = vlan_proc_init(net);
 617
 618         return err;
 619 }
 620
 621 static void __net_exit vlan_exit_net(struct net *net)
 622 {
 623         vlan_proc_cleanup(net);
 624 }
 625
 626 static struct pernet_operations vlan_net_ops = {
 627         .init = vlan_init_net,
 628         .exit = vlan_exit_net,
 629         .id   = &vlan_net_id,
 630         .size = sizeof(struct vlan_net),
 631 };
 632
 633 static int __init vlan_proto_init(void)
 634 {
 635         int err;
 636
 637         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 638
 639         err = register_pernet_subsys(&vlan_net_ops);
 640         if (err < 0)
 641                 goto err0;
 642
 643         err = register_netdevice_notifier(&vlan_notifier_block);
 644         if (err < 0)
 645                 goto err2;
 646
 647         err = vlan_gvrp_init();
 648         if (err < 0)
 649                 goto err3;
 650
 651         err = vlan_netlink_init();
 652         if (err < 0)
 653                 goto err4;
 654
 655         vlan_ioctl_set(vlan_ioctl_handler);
 656         return 0;
 657
 658 err4:
 659         vlan_gvrp_uninit();
 660 err3:
 661         unregister_netdevice_notifier(&vlan_notifier_block);
 662 err2:
 663         unregister_pernet_subsys(&vlan_net_ops);
 664 err0:
 665         return err;
 666 }
 667
 668 static void __exit vlan_cleanup_module(void)
 669 {
 670         vlan_ioctl_set(NULL);
 671         vlan_netlink_fini();
 672
 673         unregister_netdevice_notifier(&vlan_notifier_block);
 674
 675         unregister_pernet_subsys(&vlan_net_ops);
 676         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 677
 678         vlan_gvrp_uninit();
 679 }
 680
 681 module_init(vlan_proto_init);
 682 module_exit(vlan_cleanup_module);
 683
 684 MODULE_LICENSE("GPL");
 685 MODULE_VERSION(DRV_VERSION);