linux/net/8021q/vlan.c
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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: 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
  47int vlan_net_id __read_mostly;
  48
  49const char vlan_fullname[] = "802.1Q VLAN Support";
  50const char vlan_version[] = DRV_VERSION;
  51
  52/* End of global variables definitions. */
  53
  54static 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
  74void 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
 115int 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
 137int 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
 183out_uninit_applicant:
 184        if (grp->nr_vlan_devs == 0)
 185                vlan_gvrp_uninit_applicant(real_dev);
 186out_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 */
 194static 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
 258out_free_newdev:
 259        free_netdev(new_dev);
 260        return err;
 261}
 262
 263static 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
 287static 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
 304static 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
 323static 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                if (dev->features & NETIF_F_HW_VLAN_FILTER)
 407                        vlan_vid_del(dev, 0);
 408
 409                /* Put all VLANs for this dev in the down state too.  */
 410                for (i = 0; i < VLAN_N_VID; i++) {
 411                        vlandev = vlan_group_get_device(grp, i);
 412                        if (!vlandev)
 413                                continue;
 414
 415                        flgs = vlandev->flags;
 416                        if (!(flgs & IFF_UP))
 417                                continue;
 418
 419                        vlan = vlan_dev_priv(vlandev);
 420                        if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 421                                dev_change_flags(vlandev, flgs & ~IFF_UP);
 422                        netif_stacked_transfer_operstate(dev, vlandev);
 423                }
 424                break;
 425
 426        case NETDEV_UP:
 427                /* Put all VLANs for this dev in the up state too.  */
 428                for (i = 0; i < VLAN_N_VID; i++) {
 429                        vlandev = vlan_group_get_device(grp, i);
 430                        if (!vlandev)
 431                                continue;
 432
 433                        flgs = vlandev->flags;
 434                        if (flgs & IFF_UP)
 435                                continue;
 436
 437                        vlan = vlan_dev_priv(vlandev);
 438                        if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 439                                dev_change_flags(vlandev, flgs | IFF_UP);
 440                        netif_stacked_transfer_operstate(dev, vlandev);
 441                }
 442                break;
 443
 444        case NETDEV_UNREGISTER:
 445                /* twiddle thumbs on netns device moves */
 446                if (dev->reg_state != NETREG_UNREGISTERING)
 447                        break;
 448
 449                for (i = 0; i < VLAN_N_VID; i++) {
 450                        vlandev = vlan_group_get_device(grp, i);
 451                        if (!vlandev)
 452                                continue;
 453
 454                        /* removal of last vid destroys vlan_info, abort
 455                         * afterwards */
 456                        if (vlan_info->nr_vids == 1)
 457                                i = VLAN_N_VID;
 458
 459                        unregister_vlan_dev(vlandev, &list);
 460                }
 461                unregister_netdevice_many(&list);
 462                break;
 463
 464        case NETDEV_PRE_TYPE_CHANGE:
 465                /* Forbid underlaying device to change its type. */
 466                return NOTIFY_BAD;
 467
 468        case NETDEV_NOTIFY_PEERS:
 469        case NETDEV_BONDING_FAILOVER:
 470                /* Propagate to vlan devices */
 471                for (i = 0; i < VLAN_N_VID; i++) {
 472                        vlandev = vlan_group_get_device(grp, i);
 473                        if (!vlandev)
 474                                continue;
 475
 476                        call_netdevice_notifiers(event, vlandev);
 477                }
 478                break;
 479        }
 480
 481out:
 482        return NOTIFY_DONE;
 483}
 484
 485static struct notifier_block vlan_notifier_block __read_mostly = {
 486        .notifier_call = vlan_device_event,
 487};
 488
 489/*
 490 *      VLAN IOCTL handler.
 491 *      o execute requested action or pass command to the device driver
 492 *   arg is really a struct vlan_ioctl_args __user *.
 493 */
 494static int vlan_ioctl_handler(struct net *net, void __user *arg)
 495{
 496        int err;
 497        struct vlan_ioctl_args args;
 498        struct net_device *dev = NULL;
 499
 500        if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 501                return -EFAULT;
 502
 503        /* Null terminate this sucker, just in case. */
 504        args.device1[23] = 0;
 505        args.u.device2[23] = 0;
 506
 507        rtnl_lock();
 508
 509        switch (args.cmd) {
 510        case SET_VLAN_INGRESS_PRIORITY_CMD:
 511        case SET_VLAN_EGRESS_PRIORITY_CMD:
 512        case SET_VLAN_FLAG_CMD:
 513        case ADD_VLAN_CMD:
 514        case DEL_VLAN_CMD:
 515        case GET_VLAN_REALDEV_NAME_CMD:
 516        case GET_VLAN_VID_CMD:
 517                err = -ENODEV;
 518                dev = __dev_get_by_name(net, args.device1);
 519                if (!dev)
 520                        goto out;
 521
 522                err = -EINVAL;
 523                if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 524                        goto out;
 525        }
 526
 527        switch (args.cmd) {
 528        case SET_VLAN_INGRESS_PRIORITY_CMD:
 529                err = -EPERM;
 530                if (!capable(CAP_NET_ADMIN))
 531                        break;
 532                vlan_dev_set_ingress_priority(dev,
 533                                              args.u.skb_priority,
 534                                              args.vlan_qos);
 535                err = 0;
 536                break;
 537
 538        case SET_VLAN_EGRESS_PRIORITY_CMD:
 539                err = -EPERM;
 540                if (!capable(CAP_NET_ADMIN))
 541                        break;
 542                err = vlan_dev_set_egress_priority(dev,
 543                                                   args.u.skb_priority,
 544                                                   args.vlan_qos);
 545                break;
 546
 547        case SET_VLAN_FLAG_CMD:
 548                err = -EPERM;
 549                if (!capable(CAP_NET_ADMIN))
 550                        break;
 551                err = vlan_dev_change_flags(dev,
 552                                            args.vlan_qos ? args.u.flag : 0,
 553                                            args.u.flag);
 554                break;
 555
 556        case SET_VLAN_NAME_TYPE_CMD:
 557                err = -EPERM;
 558                if (!capable(CAP_NET_ADMIN))
 559                        break;
 560                if ((args.u.name_type >= 0) &&
 561                    (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 562                        struct vlan_net *vn;
 563
 564                        vn = net_generic(net, vlan_net_id);
 565                        vn->name_type = args.u.name_type;
 566                        err = 0;
 567                } else {
 568                        err = -EINVAL;
 569                }
 570                break;
 571
 572        case ADD_VLAN_CMD:
 573                err = -EPERM;
 574                if (!capable(CAP_NET_ADMIN))
 575                        break;
 576                err = register_vlan_device(dev, args.u.VID);
 577                break;
 578
 579        case DEL_VLAN_CMD:
 580                err = -EPERM;
 581                if (!capable(CAP_NET_ADMIN))
 582                        break;
 583                unregister_vlan_dev(dev, NULL);
 584                err = 0;
 585                break;
 586
 587        case GET_VLAN_REALDEV_NAME_CMD:
 588                err = 0;
 589                vlan_dev_get_realdev_name(dev, args.u.device2);
 590                if (copy_to_user(arg, &args,
 591                                 sizeof(struct vlan_ioctl_args)))
 592                        err = -EFAULT;
 593                break;
 594
 595        case GET_VLAN_VID_CMD:
 596                err = 0;
 597                args.u.VID = vlan_dev_vlan_id(dev);
 598                if (copy_to_user(arg, &args,
 599                                 sizeof(struct vlan_ioctl_args)))
 600                      err = -EFAULT;
 601                break;
 602
 603        default:
 604                err = -EOPNOTSUPP;
 605                break;
 606        }
 607out:
 608        rtnl_unlock();
 609        return err;
 610}
 611
 612static int __net_init vlan_init_net(struct net *net)
 613{
 614        struct vlan_net *vn = net_generic(net, vlan_net_id);
 615        int err;
 616
 617        vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 618
 619        err = vlan_proc_init(net);
 620
 621        return err;
 622}
 623
 624static void __net_exit vlan_exit_net(struct net *net)
 625{
 626        vlan_proc_cleanup(net);
 627}
 628
 629static struct pernet_operations vlan_net_ops = {
 630        .init = vlan_init_net,
 631        .exit = vlan_exit_net,
 632        .id   = &vlan_net_id,
 633        .size = sizeof(struct vlan_net),
 634};
 635
 636static int __init vlan_proto_init(void)
 637{
 638        int err;
 639
 640        pr_info("%s v%s\n", vlan_fullname, vlan_version);
 641
 642        err = register_pernet_subsys(&vlan_net_ops);
 643        if (err < 0)
 644                goto err0;
 645
 646        err = register_netdevice_notifier(&vlan_notifier_block);
 647        if (err < 0)
 648                goto err2;
 649
 650        err = vlan_gvrp_init();
 651        if (err < 0)
 652                goto err3;
 653
 654        err = vlan_netlink_init();
 655        if (err < 0)
 656                goto err4;
 657
 658        vlan_ioctl_set(vlan_ioctl_handler);
 659        return 0;
 660
 661err4:
 662        vlan_gvrp_uninit();
 663err3:
 664        unregister_netdevice_notifier(&vlan_notifier_block);
 665err2:
 666        unregister_pernet_subsys(&vlan_net_ops);
 667err0:
 668        return err;
 669}
 670
 671static void __exit vlan_cleanup_module(void)
 672{
 673        vlan_ioctl_set(NULL);
 674        vlan_netlink_fini();
 675
 676        unregister_netdevice_notifier(&vlan_notifier_block);
 677
 678        unregister_pernet_subsys(&vlan_net_ops);
 679        rcu_barrier(); /* Wait for completion of call_rcu()'s */
 680
 681        vlan_gvrp_uninit();
 682}
 683
 684module_init(vlan_proto_init);
 685module_exit(vlan_cleanup_module);
 686
 687MODULE_LICENSE("GPL");
 688MODULE_VERSION(DRV_VERSION);
 689
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