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   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 = NULL;
 146         int real_dev_ifindex = real_dev->ifindex;
 147         struct vlan_group *grp;
 148         int i, ret;
 149
 150         /* sanity check */
 151         if (vlan_id >= VLAN_VID_MASK)
 152                 return -EINVAL;
 153
 154         ASSERT_RTNL();
 155         grp = __vlan_find_group(real_dev_ifindex);
 156
 157         ret = 0;
 158
 159         if (grp) {
 160                 dev = vlan_group_get_device(grp, vlan_id);
 161                 if (dev) {
 162                         /* Remove proc entry */
 163                         vlan_proc_rem_dev(dev);
 164
 165                         /* Take it out of our own structures, but be sure to
 166                          * interlock with HW accelerating devices or SW vlan
 167                          * input packet processing.
 168                          */
 169                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 170                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 171
 172                         vlan_group_set_device(grp, vlan_id, NULL);
 173                         synchronize_net();
 174
 175
 176                         /* Caller unregisters (and if necessary, puts)
 177                          * VLAN device, but we get rid of the reference to
 178                          * real_dev here.
 179                          */
 180                         dev_put(real_dev);
 181
 182                         /* If the group is now empty, kill off the
 183                          * group.
 184                          */
 185                         for (i = 0; i < VLAN_VID_MASK; i++)
 186                                 if (vlan_group_get_device(grp, i))
 187                                         break;
 188
 189                         if (i == VLAN_VID_MASK) {
 190                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 191                                         real_dev->vlan_rx_register(real_dev, NULL);
 192
 193                                 hlist_del_rcu(&grp->hlist);
 194
 195                                 /* Free the group, after all cpu's are done. */
 196                                 call_rcu(&grp->rcu, vlan_rcu_free);
 197
 198                                 grp = NULL;
 199                                 ret = 1;
 200                         }
 201                 }
 202         }
 203
 204         return ret;
 205 }
 206
 207 int unregister_vlan_device(struct net_device *dev)
 208 {
 209         int ret;
 210
 211         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 212                                   VLAN_DEV_INFO(dev)->vlan_id);
 213         unregister_netdevice(dev);
 214
 215         if (ret == 1)
 216                 ret = 0;
 217         return ret;
 218 }
 219
 220 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 221 {
 222         /* Have to respect userspace enforced dormant state
 223          * of real device, also must allow supplicant running
 224          * on VLAN device
 225          */
 226         if (dev->operstate == IF_OPER_DORMANT)
 227                 netif_dormant_on(vlandev);
 228         else
 229                 netif_dormant_off(vlandev);
 230
 231         if (netif_carrier_ok(dev)) {
 232                 if (!netif_carrier_ok(vlandev))
 233                         netif_carrier_on(vlandev);
 234         } else {
 235                 if (netif_carrier_ok(vlandev))
 236                         netif_carrier_off(vlandev);
 237         }
 238 }
 239
 240 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 241 {
 242         char *name = real_dev->name;
 243
 244         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 245                 pr_info("8021q: VLANs not supported on %s\n", name);
 246                 return -EOPNOTSUPP;
 247         }
 248
 249         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 250             !real_dev->vlan_rx_register) {
 251                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 252                 return -EOPNOTSUPP;
 253         }
 254
 255         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 256             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 257                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 258                 return -EOPNOTSUPP;
 259         }
 260
 261         /* The real device must be up and operating in order to
 262          * assosciate a VLAN device with it.
 263          */
 264         if (!(real_dev->flags & IFF_UP))
 265                 return -ENETDOWN;
 266
 267         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 268                 return -EEXIST;
 269
 270         return 0;
 271 }
 272
 273 int register_vlan_dev(struct net_device *dev)
 274 {
 275         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 276         struct net_device *real_dev = vlan->real_dev;
 277         unsigned short vlan_id = vlan->vlan_id;
 278         struct vlan_group *grp, *ngrp = NULL;
 279         int err;
 280
 281         grp = __vlan_find_group(real_dev->ifindex);
 282         if (!grp) {
 283                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 284                 if (!grp)
 285                         return -ENOBUFS;
 286         }
 287
 288         err = register_netdevice(dev);
 289         if (err < 0)
 290                 goto out_free_group;
 291
 292         /* Account for reference in struct vlan_dev_info */
 293         dev_hold(real_dev);
 294
 295         vlan_transfer_operstate(real_dev, dev);
 296         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 297
 298         /* So, got the sucker initialized, now lets place
 299          * it into our local structure.
 300          */
 301         vlan_group_set_device(grp, vlan_id, dev);
 302         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 303                 real_dev->vlan_rx_register(real_dev, ngrp);
 304         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 305                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 306
 307         if (vlan_proc_add_dev(dev) < 0)
 308                 pr_warning("8021q: failed to add proc entry for %s\n",
 309                            dev->name);
 310         return 0;
 311
 312 out_free_group:
 313         if (ngrp)
 314                 vlan_group_free(ngrp);
 315         return err;
 316 }
 317
 318 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 319  *  Returns 0 if the device was created or a negative error code otherwise.
 320  */
 321 static int register_vlan_device(struct net_device *real_dev,
 322                                 unsigned short VLAN_ID)
 323 {
 324         struct net_device *new_dev;
 325         char name[IFNAMSIZ];
 326         int err;
 327
 328         if (VLAN_ID >= VLAN_VID_MASK)
 329                 return -ERANGE;
 330
 331         err = vlan_check_real_dev(real_dev, VLAN_ID);
 332         if (err < 0)
 333                 return err;
 334
 335         /* Gotta set up the fields for the device. */
 336         switch (vlan_name_type) {
 337         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 338                 /* name will look like:  eth1.0005 */
 339                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 340                 break;
 341         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 342                 /* Put our vlan.VID in the name.
 343                  * Name will look like:  vlan5
 344                  */
 345                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 346                 break;
 347         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 348                 /* Put our vlan.VID in the name.
 349                  * Name will look like:  eth0.5
 350                  */
 351                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 352                 break;
 353         case VLAN_NAME_TYPE_PLUS_VID:
 354                 /* Put our vlan.VID in the name.
 355                  * Name will look like:  vlan0005
 356                  */
 357         default:
 358                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 359         }
 360
 361         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 362                                vlan_setup);
 363
 364         if (new_dev == NULL)
 365                 return -ENOBUFS;
 366
 367         /* need 4 bytes for extra VLAN header info,
 368          * hope the underlying device can handle it.
 369          */
 370         new_dev->mtu = real_dev->mtu;
 371
 372         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 373         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 374         VLAN_DEV_INFO(new_dev)->dent = NULL;
 375         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 376
 377         new_dev->rtnl_link_ops = &vlan_link_ops;
 378         err = register_vlan_dev(new_dev);
 379         if (err < 0)
 380                 goto out_free_newdev;
 381
 382         return 0;
 383
 384 out_free_newdev:
 385         free_netdev(new_dev);
 386         return err;
 387 }
 388
 389 static void vlan_sync_address(struct net_device *dev,
 390                               struct net_device *vlandev)
 391 {
 392         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
 393
 394         /* May be called without an actual change */
 395         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 396                 return;
 397
 398         /* vlan address was different from the old address and is equal to
 399          * the new address */
 400         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 401             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 402                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 403
 404         /* vlan address was equal to the old address and is different from
 405          * the new address */
 406         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 407             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 408                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 409
 410         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 411 }
 412
 413 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 414 {
 415         struct net_device *dev = ptr;
 416         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 417         int i, flgs;
 418         struct net_device *vlandev;
 419
 420         if (dev->nd_net != &init_net)
 421                 return NOTIFY_DONE;
 422
 423         if (!grp)
 424                 goto out;
 425
 426         /* It is OK that we do not hold the group lock right now,
 427          * as we run under the RTNL lock.
 428          */
 429
 430         switch (event) {
 431         case NETDEV_CHANGE:
 432                 /* Propagate real device state to vlan devices */
 433                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 434                         vlandev = vlan_group_get_device(grp, i);
 435                         if (!vlandev)
 436                                 continue;
 437
 438                         vlan_transfer_operstate(dev, vlandev);
 439                 }
 440                 break;
 441
 442         case NETDEV_CHANGEADDR:
 443                 /* Adjust unicast filters on underlying device */
 444                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 445                         vlandev = vlan_group_get_device(grp, i);
 446                         if (!vlandev)
 447                                 continue;
 448
 449                         flgs = vlandev->flags;
 450                         if (!(flgs & IFF_UP))
 451                                 continue;
 452
 453                         vlan_sync_address(dev, vlandev);
 454                 }
 455                 break;
 456
 457         case NETDEV_DOWN:
 458                 /* Put all VLANs for this dev in the down state too.  */
 459                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 460                         vlandev = vlan_group_get_device(grp, i);
 461                         if (!vlandev)
 462                                 continue;
 463
 464                         flgs = vlandev->flags;
 465                         if (!(flgs & IFF_UP))
 466                                 continue;
 467
 468                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 469                 }
 470                 break;
 471
 472         case NETDEV_UP:
 473                 /* Put all VLANs for this dev in the up state too.  */
 474                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 475                         vlandev = vlan_group_get_device(grp, i);
 476                         if (!vlandev)
 477                                 continue;
 478
 479                         flgs = vlandev->flags;
 480                         if (flgs & IFF_UP)
 481                                 continue;
 482
 483                         dev_change_flags(vlandev, flgs | IFF_UP);
 484                 }
 485                 break;
 486
 487         case NETDEV_UNREGISTER:
 488                 /* Delete all VLANs for this dev. */
 489                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 490                         int ret;
 491
 492                         vlandev = vlan_group_get_device(grp, i);
 493                         if (!vlandev)
 494                                 continue;
 495
 496                         ret = unregister_vlan_dev(dev,
 497                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 498
 499                         unregister_netdevice(vlandev);
 500
 501                         /* Group was destroyed? */
 502                         if (ret == 1)
 503                                 break;
 504                 }
 505                 break;
 506         }
 507
 508 out:
 509         return NOTIFY_DONE;
 510 }
 511
 512 static struct notifier_block vlan_notifier_block __read_mostly = {
 513         .notifier_call = vlan_device_event,
 514 };
 515
 516 /*
 517  *      VLAN IOCTL handler.
 518  *      o execute requested action or pass command to the device driver
 519  *   arg is really a struct vlan_ioctl_args __user *.
 520  */
 521 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 522 {
 523         int err;
 524         unsigned short vid = 0;
 525         struct vlan_ioctl_args args;
 526         struct net_device *dev = NULL;
 527
 528         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 529                 return -EFAULT;
 530
 531         /* Null terminate this sucker, just in case. */
 532         args.device1[23] = 0;
 533         args.u.device2[23] = 0;
 534
 535         rtnl_lock();
 536
 537         switch (args.cmd) {
 538         case SET_VLAN_INGRESS_PRIORITY_CMD:
 539         case SET_VLAN_EGRESS_PRIORITY_CMD:
 540         case SET_VLAN_FLAG_CMD:
 541         case ADD_VLAN_CMD:
 542         case DEL_VLAN_CMD:
 543         case GET_VLAN_REALDEV_NAME_CMD:
 544         case GET_VLAN_VID_CMD:
 545                 err = -ENODEV;
 546                 dev = __dev_get_by_name(&init_net, args.device1);
 547                 if (!dev)
 548                         goto out;
 549
 550                 err = -EINVAL;
 551                 if (args.cmd != ADD_VLAN_CMD &&
 552                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 553                         goto out;
 554         }
 555
 556         switch (args.cmd) {
 557         case SET_VLAN_INGRESS_PRIORITY_CMD:
 558                 err = -EPERM;
 559                 if (!capable(CAP_NET_ADMIN))
 560                         break;
 561                 vlan_dev_set_ingress_priority(dev,
 562                                               args.u.skb_priority,
 563                                               args.vlan_qos);
 564                 err = 0;
 565                 break;
 566
 567         case SET_VLAN_EGRESS_PRIORITY_CMD:
 568                 err = -EPERM;
 569                 if (!capable(CAP_NET_ADMIN))
 570                         break;
 571                 err = vlan_dev_set_egress_priority(dev,
 572                                                    args.u.skb_priority,
 573                                                    args.vlan_qos);
 574                 break;
 575
 576         case SET_VLAN_FLAG_CMD:
 577                 err = -EPERM;
 578                 if (!capable(CAP_NET_ADMIN))
 579                         break;
 580                 err = vlan_dev_set_vlan_flag(dev,
 581                                              args.u.flag,
 582                                              args.vlan_qos);
 583                 break;
 584
 585         case SET_VLAN_NAME_TYPE_CMD:
 586                 err = -EPERM;
 587                 if (!capable(CAP_NET_ADMIN))
 588                         break;
 589                 if ((args.u.name_type >= 0) &&
 590                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 591                         vlan_name_type = args.u.name_type;
 592                         err = 0;
 593                 } else {
 594                         err = -EINVAL;
 595                 }
 596                 break;
 597
 598         case ADD_VLAN_CMD:
 599                 err = -EPERM;
 600                 if (!capable(CAP_NET_ADMIN))
 601                         break;
 602                 err = register_vlan_device(dev, args.u.VID);
 603                 break;
 604
 605         case DEL_VLAN_CMD:
 606                 err = -EPERM;
 607                 if (!capable(CAP_NET_ADMIN))
 608                         break;
 609                 err = unregister_vlan_device(dev);
 610                 break;
 611
 612         case GET_VLAN_REALDEV_NAME_CMD:
 613                 err = 0;
 614                 vlan_dev_get_realdev_name(dev, args.u.device2);
 615                 if (copy_to_user(arg, &args,
 616                                  sizeof(struct vlan_ioctl_args))) {
 617                         err = -EFAULT;
 618                 }
 619                 break;
 620
 621         case GET_VLAN_VID_CMD:
 622                 err = 0;
 623                 vlan_dev_get_vid(dev, &vid);
 624                 args.u.VID = vid;
 625                 if (copy_to_user(arg, &args,
 626                                  sizeof(struct vlan_ioctl_args))) {
 627                       err = -EFAULT;
 628                 }
 629                 break;
 630
 631         default:
 632                 err = -EOPNOTSUPP;
 633                 break;
 634         }
 635 out:
 636         rtnl_unlock();
 637         return err;
 638 }
 639
 640 static int __init vlan_proto_init(void)
 641 {
 642         int err;
 643
 644         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 645         pr_info("All bugs added by %s\n", vlan_buggyright);
 646
 647         err = vlan_proc_init();
 648         if (err < 0)
 649                 goto err1;
 650
 651         err = register_netdevice_notifier(&vlan_notifier_block);
 652         if (err < 0)
 653                 goto err2;
 654
 655         err = vlan_netlink_init();
 656         if (err < 0)
 657                 goto err3;
 658
 659         dev_add_pack(&vlan_packet_type);
 660         vlan_ioctl_set(vlan_ioctl_handler);
 661         return 0;
 662
 663 err3:
 664         unregister_netdevice_notifier(&vlan_notifier_block);
 665 err2:
 666         vlan_proc_cleanup();
 667 err1:
 668         return err;
 669 }
 670
 671 static void __exit vlan_cleanup_module(void)
 672 {
 673         unsigned int i;
 674
 675         vlan_ioctl_set(NULL);
 676         vlan_netlink_fini();
 677
 678         unregister_netdevice_notifier(&vlan_notifier_block);
 679
 680         dev_remove_pack(&vlan_packet_type);
 681
 682         /* This table must be empty if there are no module references left. */
 683         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 684                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 685
 686         vlan_proc_cleanup();
 687
 688         synchronize_net();
 689 }
 690
 691 module_init(vlan_proto_init);
 692 module_exit(vlan_cleanup_module);
 693
 694 MODULE_LICENSE("GPL");
 695 MODULE_VERSION(DRV_VERSION);