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