SAFE public projects git trees. - safe/jmp/linux-2.6/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: vlan@scry.wanfear.com
   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 #include <asm/uaccess.h> /* for copy_from_user */
  22 #include <linux/capability.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <net/datalink.h>
  27 #include <linux/mm.h>
  28 #include <linux/in.h>
  29 #include <linux/init.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/net_namespace.h>
  35
  36 #include <linux/if_vlan.h>
  37 #include "vlan.h"
  38 #include "vlanproc.h"
  39
  40 #define DRV_VERSION "1.8"
  41
  42 /* Global VLAN variables */
  43
  44 /* Our listing of VLAN group(s) */
  45 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  46 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  47
  48 static char vlan_fullname[] = "802.1Q VLAN Support";
  49 static char vlan_version[] = DRV_VERSION;
  50 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  51 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  52
  53 /* Determines interface naming scheme. */
  54 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  55
  56 static struct packet_type vlan_packet_type = {
  57         .type = __constant_htons(ETH_P_8021Q),
  58         .func = vlan_skb_recv, /* VLAN receive method */
  59 };
  60
  61 /* End of global variables definitions. */
  62
  63 /* Must be invoked with RCU read lock (no preempt) */
  64 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
  65 {
  66         struct vlan_group *grp;
  67         struct hlist_node *n;
  68         int hash = vlan_grp_hashfn(real_dev_ifindex);
  69
  70         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  71                 if (grp->real_dev_ifindex == real_dev_ifindex)
  72                         return grp;
  73         }
  74
  75         return NULL;
  76 }
  77
  78 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  79  *
  80  * Must be invoked with RCU read lock (no preempt)
  81  */
  82 struct net_device *__find_vlan_dev(struct net_device *real_dev,
  83                                    unsigned short VID)
  84 {
  85         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
  86
  87         if (grp)
  88                 return vlan_group_get_device(grp, VID);
  89
  90         return NULL;
  91 }
  92
  93 static void vlan_group_free(struct vlan_group *grp)
  94 {
  95         int i;
  96
  97         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
  98                 kfree(grp->vlan_devices_arrays[i]);
  99         kfree(grp);
 100 }
 101
 102 static struct vlan_group *vlan_group_alloc(int ifindex)
 103 {
 104         struct vlan_group *grp;
 105         unsigned int size;
 106         unsigned int i;
 107
 108         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 109         if (!grp)
 110                 return NULL;
 111
 112         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 113
 114         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 115                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
 116                 if (!grp->vlan_devices_arrays[i])
 117                         goto err;
 118         }
 119
 120         grp->real_dev_ifindex = ifindex;
 121         hlist_add_head_rcu(&grp->hlist,
 122                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
 123         return grp;
 124
 125 err:
 126         vlan_group_free(grp);
 127         return NULL;
 128 }
 129
 130 static void vlan_rcu_free(struct rcu_head *rcu)
 131 {
 132         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 133 }
 134
 135
 136 /* This returns 0 if everything went fine.
 137  * It will return 1 if the group was killed as a result.
 138  * A negative return indicates failure.
 139  *
 140  * The RTNL lock must be held.
 141  */
 142 static int unregister_vlan_dev(struct net_device *real_dev,
 143                                unsigned short vlan_id)
 144 {
 145         struct net_device *dev;
 146         int real_dev_ifindex = real_dev->ifindex;
 147         struct vlan_group *grp;
 148         unsigned int i;
 149         int ret;
 150
 151         if (vlan_id >= VLAN_VID_MASK)
 152                 return -EINVAL;
 153
 154         ASSERT_RTNL();
 155         grp = __vlan_find_group(real_dev_ifindex);
 156         if (!grp)
 157                 return -ENOENT;
 158
 159         dev = vlan_group_get_device(grp, vlan_id);
 160         if (!dev)
 161                 return -ENOENT;
 162
 163         vlan_proc_rem_dev(dev);
 164
 165         /* Take it out of our own structures, but be sure to interlock with
 166          * HW accelerating devices or SW vlan input packet processing.
 167          */
 168         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 169                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 170
 171         vlan_group_set_device(grp, vlan_id, NULL);
 172         synchronize_net();
 173
 174         /* Caller unregisters (and if necessary, puts) VLAN device, but we
 175          * get rid of the reference to real_dev here.
 176          */
 177         dev_put(real_dev);
 178
 179         /* If the group is now empty, kill off the group. */
 180         ret = 0;
 181         for (i = 0; i < VLAN_VID_MASK; i++)
 182                 if (vlan_group_get_device(grp, i))
 183                         break;
 184
 185         if (i == VLAN_VID_MASK) {
 186                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 187                         real_dev->vlan_rx_register(real_dev, NULL);
 188
 189                 hlist_del_rcu(&grp->hlist);
 190
 191                 /* Free the group, after all cpu's are done. */
 192                 call_rcu(&grp->rcu, vlan_rcu_free);
 193                 ret = 1;
 194         }
 195
 196         return ret;
 197 }
 198
 199 int unregister_vlan_device(struct net_device *dev)
 200 {
 201         int ret;
 202
 203         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 204                                   VLAN_DEV_INFO(dev)->vlan_id);
 205         unregister_netdevice(dev);
 206
 207         if (ret == 1)
 208                 ret = 0;
 209         return ret;
 210 }
 211
 212 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 213 {
 214         /* Have to respect userspace enforced dormant state
 215          * of real device, also must allow supplicant running
 216          * on VLAN device
 217          */
 218         if (dev->operstate == IF_OPER_DORMANT)
 219                 netif_dormant_on(vlandev);
 220         else
 221                 netif_dormant_off(vlandev);
 222
 223         if (netif_carrier_ok(dev)) {
 224                 if (!netif_carrier_ok(vlandev))
 225                         netif_carrier_on(vlandev);
 226         } else {
 227                 if (netif_carrier_ok(vlandev))
 228                         netif_carrier_off(vlandev);
 229         }
 230 }
 231
 232 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 233 {
 234         char *name = real_dev->name;
 235
 236         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 237                 pr_info("8021q: VLANs not supported on %s\n", name);
 238                 return -EOPNOTSUPP;
 239         }
 240
 241         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 242             !real_dev->vlan_rx_register) {
 243                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 244                 return -EOPNOTSUPP;
 245         }
 246
 247         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 248             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 249                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 250                 return -EOPNOTSUPP;
 251         }
 252
 253         /* The real device must be up and operating in order to
 254          * assosciate a VLAN device with it.
 255          */
 256         if (!(real_dev->flags & IFF_UP))
 257                 return -ENETDOWN;
 258
 259         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 260                 return -EEXIST;
 261
 262         return 0;
 263 }
 264
 265 int register_vlan_dev(struct net_device *dev)
 266 {
 267         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 268         struct net_device *real_dev = vlan->real_dev;
 269         unsigned short vlan_id = vlan->vlan_id;
 270         struct vlan_group *grp, *ngrp = NULL;
 271         int err;
 272
 273         grp = __vlan_find_group(real_dev->ifindex);
 274         if (!grp) {
 275                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 276                 if (!grp)
 277                         return -ENOBUFS;
 278         }
 279
 280         err = register_netdevice(dev);
 281         if (err < 0)
 282                 goto out_free_group;
 283
 284         /* Account for reference in struct vlan_dev_info */
 285         dev_hold(real_dev);
 286
 287         vlan_transfer_operstate(real_dev, dev);
 288         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 289
 290         /* So, got the sucker initialized, now lets place
 291          * it into our local structure.
 292          */
 293         vlan_group_set_device(grp, vlan_id, dev);
 294         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 295                 real_dev->vlan_rx_register(real_dev, ngrp);
 296         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 297                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 298
 299         if (vlan_proc_add_dev(dev) < 0)
 300                 pr_warning("8021q: failed to add proc entry for %s\n",
 301                            dev->name);
 302         return 0;
 303
 304 out_free_group:
 305         if (ngrp)
 306                 vlan_group_free(ngrp);
 307         return err;
 308 }
 309
 310 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 311  *  Returns 0 if the device was created or a negative error code otherwise.
 312  */
 313 static int register_vlan_device(struct net_device *real_dev,
 314                                 unsigned short VLAN_ID)
 315 {
 316         struct net_device *new_dev;
 317         char name[IFNAMSIZ];
 318         int err;
 319
 320         if (VLAN_ID >= VLAN_VID_MASK)
 321                 return -ERANGE;
 322
 323         err = vlan_check_real_dev(real_dev, VLAN_ID);
 324         if (err < 0)
 325                 return err;
 326
 327         /* Gotta set up the fields for the device. */
 328         switch (vlan_name_type) {
 329         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 330                 /* name will look like:  eth1.0005 */
 331                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 332                 break;
 333         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 334                 /* Put our vlan.VID in the name.
 335                  * Name will look like:  vlan5
 336                  */
 337                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 338                 break;
 339         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 340                 /* Put our vlan.VID in the name.
 341                  * Name will look like:  eth0.5
 342                  */
 343                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 344                 break;
 345         case VLAN_NAME_TYPE_PLUS_VID:
 346                 /* Put our vlan.VID in the name.
 347                  * Name will look like:  vlan0005
 348                  */
 349         default:
 350                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 351         }
 352
 353         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 354                                vlan_setup);
 355
 356         if (new_dev == NULL)
 357                 return -ENOBUFS;
 358
 359         /* need 4 bytes for extra VLAN header info,
 360          * hope the underlying device can handle it.
 361          */
 362         new_dev->mtu = real_dev->mtu;
 363
 364         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 365         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 366         VLAN_DEV_INFO(new_dev)->dent = NULL;
 367         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 368
 369         new_dev->rtnl_link_ops = &vlan_link_ops;
 370         err = register_vlan_dev(new_dev);
 371         if (err < 0)
 372                 goto out_free_newdev;
 373
 374         return 0;
 375
 376 out_free_newdev:
 377         free_netdev(new_dev);
 378         return err;
 379 }
 380
 381 static void vlan_sync_address(struct net_device *dev,
 382                               struct net_device *vlandev)
 383 {
 384         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
 385
 386         /* May be called without an actual change */
 387         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 388                 return;
 389
 390         /* vlan address was different from the old address and is equal to
 391          * the new address */
 392         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 393             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 394                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 395
 396         /* vlan address was equal to the old address and is different from
 397          * the new address */
 398         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 399             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 400                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 401
 402         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 403 }
 404
 405 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 406 {
 407         struct net_device *dev = ptr;
 408         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 409         int i, flgs;
 410         struct net_device *vlandev;
 411
 412         if (dev->nd_net != &init_net)
 413                 return NOTIFY_DONE;
 414
 415         if (!grp)
 416                 goto out;
 417
 418         /* It is OK that we do not hold the group lock right now,
 419          * as we run under the RTNL lock.
 420          */
 421
 422         switch (event) {
 423         case NETDEV_CHANGE:
 424                 /* Propagate real device state to vlan devices */
 425                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 426                         vlandev = vlan_group_get_device(grp, i);
 427                         if (!vlandev)
 428                                 continue;
 429
 430                         vlan_transfer_operstate(dev, vlandev);
 431                 }
 432                 break;
 433
 434         case NETDEV_CHANGEADDR:
 435                 /* Adjust unicast filters on underlying device */
 436                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 437                         vlandev = vlan_group_get_device(grp, i);
 438                         if (!vlandev)
 439                                 continue;
 440
 441                         flgs = vlandev->flags;
 442                         if (!(flgs & IFF_UP))
 443                                 continue;
 444
 445                         vlan_sync_address(dev, vlandev);
 446                 }
 447                 break;
 448
 449         case NETDEV_DOWN:
 450                 /* Put all VLANs for this dev in the down state too.  */
 451                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 452                         vlandev = vlan_group_get_device(grp, i);
 453                         if (!vlandev)
 454                                 continue;
 455
 456                         flgs = vlandev->flags;
 457                         if (!(flgs & IFF_UP))
 458                                 continue;
 459
 460                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 461                 }
 462                 break;
 463
 464         case NETDEV_UP:
 465                 /* Put all VLANs for this dev in the up state too.  */
 466                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 467                         vlandev = vlan_group_get_device(grp, i);
 468                         if (!vlandev)
 469                                 continue;
 470
 471                         flgs = vlandev->flags;
 472                         if (flgs & IFF_UP)
 473                                 continue;
 474
 475                         dev_change_flags(vlandev, flgs | IFF_UP);
 476                 }
 477                 break;
 478
 479         case NETDEV_UNREGISTER:
 480                 /* Delete all VLANs for this dev. */
 481                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 482                         int ret;
 483
 484                         vlandev = vlan_group_get_device(grp, i);
 485                         if (!vlandev)
 486                                 continue;
 487
 488                         ret = unregister_vlan_dev(dev,
 489                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 490
 491                         unregister_netdevice(vlandev);
 492
 493                         /* Group was destroyed? */
 494                         if (ret == 1)
 495                                 break;
 496                 }
 497                 break;
 498         }
 499
 500 out:
 501         return NOTIFY_DONE;
 502 }
 503
 504 static struct notifier_block vlan_notifier_block __read_mostly = {
 505         .notifier_call = vlan_device_event,
 506 };
 507
 508 /*
 509  *      VLAN IOCTL handler.
 510  *      o execute requested action or pass command to the device driver
 511  *   arg is really a struct vlan_ioctl_args __user *.
 512  */
 513 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 514 {
 515         int err;
 516         unsigned short vid = 0;
 517         struct vlan_ioctl_args args;
 518         struct net_device *dev = NULL;
 519
 520         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 521                 return -EFAULT;
 522
 523         /* Null terminate this sucker, just in case. */
 524         args.device1[23] = 0;
 525         args.u.device2[23] = 0;
 526
 527         rtnl_lock();
 528
 529         switch (args.cmd) {
 530         case SET_VLAN_INGRESS_PRIORITY_CMD:
 531         case SET_VLAN_EGRESS_PRIORITY_CMD:
 532         case SET_VLAN_FLAG_CMD:
 533         case ADD_VLAN_CMD:
 534         case DEL_VLAN_CMD:
 535         case GET_VLAN_REALDEV_NAME_CMD:
 536         case GET_VLAN_VID_CMD:
 537                 err = -ENODEV;
 538                 dev = __dev_get_by_name(&init_net, args.device1);
 539                 if (!dev)
 540                         goto out;
 541
 542                 err = -EINVAL;
 543                 if (args.cmd != ADD_VLAN_CMD &&
 544                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 545                         goto out;
 546         }
 547
 548         switch (args.cmd) {
 549         case SET_VLAN_INGRESS_PRIORITY_CMD:
 550                 err = -EPERM;
 551                 if (!capable(CAP_NET_ADMIN))
 552                         break;
 553                 vlan_dev_set_ingress_priority(dev,
 554                                               args.u.skb_priority,
 555                                               args.vlan_qos);
 556                 err = 0;
 557                 break;
 558
 559         case SET_VLAN_EGRESS_PRIORITY_CMD:
 560                 err = -EPERM;
 561                 if (!capable(CAP_NET_ADMIN))
 562                         break;
 563                 err = vlan_dev_set_egress_priority(dev,
 564                                                    args.u.skb_priority,
 565                                                    args.vlan_qos);
 566                 break;
 567
 568         case SET_VLAN_FLAG_CMD:
 569                 err = -EPERM;
 570                 if (!capable(CAP_NET_ADMIN))
 571                         break;
 572                 err = vlan_dev_set_vlan_flag(dev,
 573                                              args.u.flag,
 574                                              args.vlan_qos);
 575                 break;
 576
 577         case SET_VLAN_NAME_TYPE_CMD:
 578                 err = -EPERM;
 579                 if (!capable(CAP_NET_ADMIN))
 580                         break;
 581                 if ((args.u.name_type >= 0) &&
 582                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 583                         vlan_name_type = args.u.name_type;
 584                         err = 0;
 585                 } else {
 586                         err = -EINVAL;
 587                 }
 588                 break;
 589
 590         case ADD_VLAN_CMD:
 591                 err = -EPERM;
 592                 if (!capable(CAP_NET_ADMIN))
 593                         break;
 594                 err = register_vlan_device(dev, args.u.VID);
 595                 break;
 596
 597         case DEL_VLAN_CMD:
 598                 err = -EPERM;
 599                 if (!capable(CAP_NET_ADMIN))
 600                         break;
 601                 err = unregister_vlan_device(dev);
 602                 break;
 603
 604         case GET_VLAN_REALDEV_NAME_CMD:
 605                 err = 0;
 606                 vlan_dev_get_realdev_name(dev, args.u.device2);
 607                 if (copy_to_user(arg, &args,
 608                                  sizeof(struct vlan_ioctl_args))) {
 609                         err = -EFAULT;
 610                 }
 611                 break;
 612
 613         case GET_VLAN_VID_CMD:
 614                 err = 0;
 615                 vlan_dev_get_vid(dev, &vid);
 616                 args.u.VID = vid;
 617                 if (copy_to_user(arg, &args,
 618                                  sizeof(struct vlan_ioctl_args))) {
 619                       err = -EFAULT;
 620                 }
 621                 break;
 622
 623         default:
 624                 err = -EOPNOTSUPP;
 625                 break;
 626         }
 627 out:
 628         rtnl_unlock();
 629         return err;
 630 }
 631
 632 static int __init vlan_proto_init(void)
 633 {
 634         int err;
 635
 636         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 637         pr_info("All bugs added by %s\n", vlan_buggyright);
 638
 639         err = vlan_proc_init();
 640         if (err < 0)
 641                 goto err1;
 642
 643         err = register_netdevice_notifier(&vlan_notifier_block);
 644         if (err < 0)
 645                 goto err2;
 646
 647         err = vlan_netlink_init();
 648         if (err < 0)
 649                 goto err3;
 650
 651         dev_add_pack(&vlan_packet_type);
 652         vlan_ioctl_set(vlan_ioctl_handler);
 653         return 0;
 654
 655 err3:
 656         unregister_netdevice_notifier(&vlan_notifier_block);
 657 err2:
 658         vlan_proc_cleanup();
 659 err1:
 660         return err;
 661 }
 662
 663 static void __exit vlan_cleanup_module(void)
 664 {
 665         unsigned int i;
 666
 667         vlan_ioctl_set(NULL);
 668         vlan_netlink_fini();
 669
 670         unregister_netdevice_notifier(&vlan_notifier_block);
 671
 672         dev_remove_pack(&vlan_packet_type);
 673
 674         /* This table must be empty if there are no module references left. */
 675         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 676                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 677
 678         vlan_proc_cleanup();
 679
 680         synchronize_net();
 681 }
 682
 683 module_init(vlan_proto_init);
 684 module_exit(vlan_cleanup_module);
 685
 686 MODULE_LICENSE("GPL");
 687 MODULE_VERSION(DRV_VERSION);