net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  22
  23 #include <linux/capability.h>
  24 #include <linux/module.h>
  25 #include <linux/netdevice.h>
  26 #include <linux/skbuff.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <linux/rculist.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/rtnetlink.h>
  35 #include <net/net_namespace.h>
  36 #include <net/netns/generic.h>
  37 #include <asm/uaccess.h>
  38
  39 #include <linux/if_vlan.h>
  40 #include "vlan.h"
  41 #include "vlanproc.h"
  42
  43 #define DRV_VERSION "1.8"
  44
  45 /* Global VLAN variables */
  46
  47 int vlan_net_id __read_mostly;
  48
  49 const char vlan_fullname[] = "802.1Q VLAN Support";
  50 const char vlan_version[] = DRV_VERSION;
  51
  52 /* End of global variables definitions. */
  53
  54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
  55                                    __be16 vlan_proto, u16 vlan_id)
  56 {
  57         struct net_device **array;
  58         unsigned int pidx, vidx;
  59         unsigned int size;
  60
  61         ASSERT_RTNL();
  62
  63         pidx  = vlan_proto_idx(vlan_proto);
  64         vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
  65         array = vg->vlan_devices_arrays[pidx][vidx];
  66         if (array != NULL)
  67                 return 0;
  68
  69         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
  70         array = kzalloc(size, GFP_KERNEL);
  71         if (array == NULL)
  72                 return -ENOBUFS;
  73
  74         vg->vlan_devices_arrays[pidx][vidx] = array;
  75         return 0;
  76 }
  77
  78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
  79 {
  80         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
  81         struct net_device *real_dev = vlan->real_dev;
  82         struct vlan_info *vlan_info;
  83         struct vlan_group *grp;
  84         u16 vlan_id = vlan->vlan_id;
  85
  86         ASSERT_RTNL();
  87
  88         vlan_info = rtnl_dereference(real_dev->vlan_info);
  89         BUG_ON(!vlan_info);
  90
  91         grp = &vlan_info->grp;
  92
  93         grp->nr_vlan_devs--;
  94
  95         if (vlan->flags & VLAN_FLAG_MVRP)
  96                 vlan_mvrp_request_leave(dev);
  97         if (vlan->flags & VLAN_FLAG_GVRP)
  98                 vlan_gvrp_request_leave(dev);
  99
 100         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
 101
 102         netdev_upper_dev_unlink(real_dev, dev);
 103         /* Because unregister_netdevice_queue() makes sure at least one rcu
 104          * grace period is respected before device freeing,
 105          * we dont need to call synchronize_net() here.
 106          */
 107         unregister_netdevice_queue(dev, head);
 108
 109         if (grp->nr_vlan_devs == 0) {
 110                 vlan_mvrp_uninit_applicant(real_dev);
 111                 vlan_gvrp_uninit_applicant(real_dev);
 112         }
 113
 114         /* Take it out of our own structures, but be sure to interlock with
 115          * HW accelerating devices or SW vlan input packet processing if
 116          * VLAN is not 0 (leave it there for 802.1p).
 117          */
 118         if (vlan_id)
 119                 vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 120
 121         /* Get rid of the vlan's reference to real_dev */
 122         dev_put(real_dev);
 123 }
 124
 125 int vlan_check_real_dev(struct net_device *real_dev,
 126                         __be16 protocol, u16 vlan_id)
 127 {
 128         const char *name = real_dev->name;
 129
 130         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 131                 pr_info("VLANs not supported on %s\n", name);
 132                 return -EOPNOTSUPP;
 133         }
 134
 135         if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL)
 136                 return -EEXIST;
 137
 138         return 0;
 139 }
 140
 141 int register_vlan_dev(struct net_device *dev)
 142 {
 143         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 144         struct net_device *real_dev = vlan->real_dev;
 145         u16 vlan_id = vlan->vlan_id;
 146         struct vlan_info *vlan_info;
 147         struct vlan_group *grp;
 148         int err;
 149
 150         err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
 151         if (err)
 152                 return err;
 153
 154         vlan_info = rtnl_dereference(real_dev->vlan_info);
 155         /* vlan_info should be there now. vlan_vid_add took care of it */
 156         BUG_ON(!vlan_info);
 157
 158         grp = &vlan_info->grp;
 159         if (grp->nr_vlan_devs == 0) {
 160                 err = vlan_gvrp_init_applicant(real_dev);
 161                 if (err < 0)
 162                         goto out_vid_del;
 163                 err = vlan_mvrp_init_applicant(real_dev);
 164                 if (err < 0)
 165                         goto out_uninit_gvrp;
 166         }
 167
 168         err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
 169         if (err < 0)
 170                 goto out_uninit_mvrp;
 171
 172         err = register_netdevice(dev);
 173         if (err < 0)
 174                 goto out_uninit_mvrp;
 175
 176         err = netdev_upper_dev_link(real_dev, dev);
 177         if (err)
 178                 goto out_unregister_netdev;
 179
 180         /* Account for reference in struct vlan_dev_priv */
 181         dev_hold(real_dev);
 182
 183         netif_stacked_transfer_operstate(real_dev, dev);
 184         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 185
 186         /* So, got the sucker initialized, now lets place
 187          * it into our local structure.
 188          */
 189         vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
 190         grp->nr_vlan_devs++;
 191
 192         return 0;
 193
 194 out_unregister_netdev:
 195         unregister_netdevice(dev);
 196 out_uninit_mvrp:
 197         if (grp->nr_vlan_devs == 0)
 198                 vlan_mvrp_uninit_applicant(real_dev);
 199 out_uninit_gvrp:
 200         if (grp->nr_vlan_devs == 0)
 201                 vlan_gvrp_uninit_applicant(real_dev);
 202 out_vid_del:
 203         vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 204         return err;
 205 }
 206
 207 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 208  *  Returns 0 if the device was created or a negative error code otherwise.
 209  */
 210 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 211 {
 212         struct net_device *new_dev;
 213         struct vlan_dev_priv *vlan;
 214         struct net *net = dev_net(real_dev);
 215         struct vlan_net *vn = net_generic(net, vlan_net_id);
 216         char name[IFNAMSIZ];
 217         int err;
 218
 219         if (vlan_id >= VLAN_VID_MASK)
 220                 return -ERANGE;
 221
 222         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
 223         if (err < 0)
 224                 return err;
 225
 226         /* Gotta set up the fields for the device. */
 227         switch (vn->name_type) {
 228         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 229                 /* name will look like:  eth1.0005 */
 230                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 231                 break;
 232         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 233                 /* Put our vlan.VID in the name.
 234                  * Name will look like:  vlan5
 235                  */
 236                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 237                 break;
 238         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 239                 /* Put our vlan.VID in the name.
 240                  * Name will look like:  eth0.5
 241                  */
 242                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 243                 break;
 244         case VLAN_NAME_TYPE_PLUS_VID:
 245                 /* Put our vlan.VID in the name.
 246                  * Name will look like:  vlan0005
 247                  */
 248         default:
 249                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 250         }
 251
 252         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
 253
 254         if (new_dev == NULL)
 255                 return -ENOBUFS;
 256
 257         dev_net_set(new_dev, net);
 258         /* need 4 bytes for extra VLAN header info,
 259          * hope the underlying device can handle it.
 260          */
 261         new_dev->mtu = real_dev->mtu;
 262         new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
 263
 264         vlan = vlan_dev_priv(new_dev);
 265         vlan->vlan_proto = htons(ETH_P_8021Q);
 266         vlan->vlan_id = vlan_id;
 267         vlan->real_dev = real_dev;
 268         vlan->dent = NULL;
 269         vlan->flags = VLAN_FLAG_REORDER_HDR;
 270
 271         new_dev->rtnl_link_ops = &vlan_link_ops;
 272         err = register_vlan_dev(new_dev);
 273         if (err < 0)
 274                 goto out_free_newdev;
 275
 276         return 0;
 277
 278 out_free_newdev:
 279         free_netdev(new_dev);
 280         return err;
 281 }
 282
 283 static void vlan_sync_address(struct net_device *dev,
 284                               struct net_device *vlandev)
 285 {
 286         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 287
 288         /* May be called without an actual change */
 289         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 290                 return;
 291
 292         /* vlan address was different from the old address and is equal to
 293          * the new address */
 294         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 295             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 296                 dev_uc_del(dev, vlandev->dev_addr);
 297
 298         /* vlan address was equal to the old address and is different from
 299          * the new address */
 300         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 301             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 302                 dev_uc_add(dev, vlandev->dev_addr);
 303
 304         ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
 305 }
 306
 307 static void vlan_transfer_features(struct net_device *dev,
 308                                    struct net_device *vlandev)
 309 {
 310         vlandev->gso_max_size = dev->gso_max_size;
 311
 312         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
 313                 vlandev->hard_header_len = dev->hard_header_len;
 314         else
 315                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 316
 317 #if IS_ENABLED(CONFIG_FCOE)
 318         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 319 #endif
 320
 321         netdev_update_features(vlandev);
 322 }
 323
 324 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 325 {
 326         switch (event) {
 327         case NETDEV_CHANGENAME:
 328                 vlan_proc_rem_dev(dev);
 329                 if (vlan_proc_add_dev(dev) < 0)
 330                         pr_warn("failed to change proc name for %s\n",
 331                                 dev->name);
 332                 break;
 333         case NETDEV_REGISTER:
 334                 if (vlan_proc_add_dev(dev) < 0)
 335                         pr_warn("failed to add proc entry for %s\n", dev->name);
 336                 break;
 337         case NETDEV_UNREGISTER:
 338                 vlan_proc_rem_dev(dev);
 339                 break;
 340         }
 341 }
 342
 343 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 344                              void *ptr)
 345 {
 346         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 347         struct vlan_group *grp;
 348         struct vlan_info *vlan_info;
 349         int i, flgs;
 350         struct net_device *vlandev;
 351         struct vlan_dev_priv *vlan;
 352         bool last = false;
 353         LIST_HEAD(list);
 354
 355         if (is_vlan_dev(dev))
 356                 __vlan_device_event(dev, event);
 357
 358         if ((event == NETDEV_UP) &&
 359             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 360                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 361                         dev->name);
 362                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 363         }
 364
 365         vlan_info = rtnl_dereference(dev->vlan_info);
 366         if (!vlan_info)
 367                 goto out;
 368         grp = &vlan_info->grp;
 369
 370         /* It is OK that we do not hold the group lock right now,
 371          * as we run under the RTNL lock.
 372          */
 373
 374         switch (event) {
 375         case NETDEV_CHANGE:
 376                 /* Propagate real device state to vlan devices */
 377                 vlan_group_for_each_dev(grp, i, vlandev)
 378                         netif_stacked_transfer_operstate(dev, vlandev);
 379                 break;
 380
 381         case NETDEV_CHANGEADDR:
 382                 /* Adjust unicast filters on underlying device */
 383                 vlan_group_for_each_dev(grp, i, vlandev) {
 384                         flgs = vlandev->flags;
 385                         if (!(flgs & IFF_UP))
 386                                 continue;
 387
 388                         vlan_sync_address(dev, vlandev);
 389                 }
 390                 break;
 391
 392         case NETDEV_CHANGEMTU:
 393                 vlan_group_for_each_dev(grp, i, vlandev) {
 394                         if (vlandev->mtu <= dev->mtu)
 395                                 continue;
 396
 397                         dev_set_mtu(vlandev, dev->mtu);
 398                 }
 399                 break;
 400
 401         case NETDEV_FEAT_CHANGE:
 402                 /* Propagate device features to underlying device */
 403                 vlan_group_for_each_dev(grp, i, vlandev)
 404                         vlan_transfer_features(dev, vlandev);
 405                 break;
 406
 407         case NETDEV_DOWN:
 408                 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
 409                         vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 410
 411                 /* Put all VLANs for this dev in the down state too.  */
 412                 vlan_group_for_each_dev(grp, i, vlandev) {
 413                         flgs = vlandev->flags;
 414                         if (!(flgs & IFF_UP))
 415                                 continue;
 416
 417                         vlan = vlan_dev_priv(vlandev);
 418                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 419                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 420                         netif_stacked_transfer_operstate(dev, vlandev);
 421                 }
 422                 break;
 423
 424         case NETDEV_UP:
 425                 /* Put all VLANs for this dev in the up state too.  */
 426                 vlan_group_for_each_dev(grp, i, vlandev) {
 427                         flgs = vlandev->flags;
 428                         if (flgs & IFF_UP)
 429                                 continue;
 430
 431                         vlan = vlan_dev_priv(vlandev);
 432                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 433                                 dev_change_flags(vlandev, flgs | IFF_UP);
 434                         netif_stacked_transfer_operstate(dev, vlandev);
 435                 }
 436                 break;
 437
 438         case NETDEV_UNREGISTER:
 439                 /* twiddle thumbs on netns device moves */
 440                 if (dev->reg_state != NETREG_UNREGISTERING)
 441                         break;
 442
 443                 vlan_group_for_each_dev(grp, i, vlandev) {
 444                         /* removal of last vid destroys vlan_info, abort
 445                          * afterwards */
 446                         if (vlan_info->nr_vids == 1)
 447                                 last = true;
 448
 449                         unregister_vlan_dev(vlandev, &list);
 450                         if (last)
 451                                 break;
 452                 }
 453                 unregister_netdevice_many(&list);
 454                 break;
 455
 456         case NETDEV_PRE_TYPE_CHANGE:
 457                 /* Forbid underlaying device to change its type. */
 458                 if (vlan_uses_dev(dev))
 459                         return NOTIFY_BAD;
 460                 break;
 461
 462         case NETDEV_NOTIFY_PEERS:
 463         case NETDEV_BONDING_FAILOVER:
 464         case NETDEV_RESEND_IGMP:
 465                 /* Propagate to vlan devices */
 466                 vlan_group_for_each_dev(grp, i, vlandev)
 467                         call_netdevice_notifiers(event, vlandev);
 468                 break;
 469         }
 470
 471 out:
 472         return NOTIFY_DONE;
 473 }
 474
 475 static struct notifier_block vlan_notifier_block __read_mostly = {
 476         .notifier_call = vlan_device_event,
 477 };
 478
 479 /*
 480  *      VLAN IOCTL handler.
 481  *      o execute requested action or pass command to the device driver
 482  *   arg is really a struct vlan_ioctl_args __user *.
 483  */
 484 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 485 {
 486         int err;
 487         struct vlan_ioctl_args args;
 488         struct net_device *dev = NULL;
 489
 490         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 491                 return -EFAULT;
 492
 493         /* Null terminate this sucker, just in case. */
 494         args.device1[23] = 0;
 495         args.u.device2[23] = 0;
 496
 497         rtnl_lock();
 498
 499         switch (args.cmd) {
 500         case SET_VLAN_INGRESS_PRIORITY_CMD:
 501         case SET_VLAN_EGRESS_PRIORITY_CMD:
 502         case SET_VLAN_FLAG_CMD:
 503         case ADD_VLAN_CMD:
 504         case DEL_VLAN_CMD:
 505         case GET_VLAN_REALDEV_NAME_CMD:
 506         case GET_VLAN_VID_CMD:
 507                 err = -ENODEV;
 508                 dev = __dev_get_by_name(net, args.device1);
 509                 if (!dev)
 510                         goto out;
 511
 512                 err = -EINVAL;
 513                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 514                         goto out;
 515         }
 516
 517         switch (args.cmd) {
 518         case SET_VLAN_INGRESS_PRIORITY_CMD:
 519                 err = -EPERM;
 520                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 521                         break;
 522                 vlan_dev_set_ingress_priority(dev,
 523                                               args.u.skb_priority,
 524                                               args.vlan_qos);
 525                 err = 0;
 526                 break;
 527
 528         case SET_VLAN_EGRESS_PRIORITY_CMD:
 529                 err = -EPERM;
 530                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 531                         break;
 532                 err = vlan_dev_set_egress_priority(dev,
 533                                                    args.u.skb_priority,
 534                                                    args.vlan_qos);
 535                 break;
 536
 537         case SET_VLAN_FLAG_CMD:
 538                 err = -EPERM;
 539                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 540                         break;
 541                 err = vlan_dev_change_flags(dev,
 542                                             args.vlan_qos ? args.u.flag : 0,
 543                                             args.u.flag);
 544                 break;
 545
 546         case SET_VLAN_NAME_TYPE_CMD:
 547                 err = -EPERM;
 548                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 549                         break;
 550                 if ((args.u.name_type >= 0) &&
 551                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 552                         struct vlan_net *vn;
 553
 554                         vn = net_generic(net, vlan_net_id);
 555                         vn->name_type = args.u.name_type;
 556                         err = 0;
 557                 } else {
 558                         err = -EINVAL;
 559                 }
 560                 break;
 561
 562         case ADD_VLAN_CMD:
 563                 err = -EPERM;
 564                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 565                         break;
 566                 err = register_vlan_device(dev, args.u.VID);
 567                 break;
 568
 569         case DEL_VLAN_CMD:
 570                 err = -EPERM;
 571                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 572                         break;
 573                 unregister_vlan_dev(dev, NULL);
 574                 err = 0;
 575                 break;
 576
 577         case GET_VLAN_REALDEV_NAME_CMD:
 578                 err = 0;
 579                 vlan_dev_get_realdev_name(dev, args.u.device2);
 580                 if (copy_to_user(arg, &args,
 581                                  sizeof(struct vlan_ioctl_args)))
 582                         err = -EFAULT;
 583                 break;
 584
 585         case GET_VLAN_VID_CMD:
 586                 err = 0;
 587                 args.u.VID = vlan_dev_vlan_id(dev);
 588                 if (copy_to_user(arg, &args,
 589                                  sizeof(struct vlan_ioctl_args)))
 590                       err = -EFAULT;
 591                 break;
 592
 593         default:
 594                 err = -EOPNOTSUPP;
 595                 break;
 596         }
 597 out:
 598         rtnl_unlock();
 599         return err;
 600 }
 601
 602 static int __net_init vlan_init_net(struct net *net)
 603 {
 604         struct vlan_net *vn = net_generic(net, vlan_net_id);
 605         int err;
 606
 607         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 608
 609         err = vlan_proc_init(net);
 610
 611         return err;
 612 }
 613
 614 static void __net_exit vlan_exit_net(struct net *net)
 615 {
 616         vlan_proc_cleanup(net);
 617 }
 618
 619 static struct pernet_operations vlan_net_ops = {
 620         .init = vlan_init_net,
 621         .exit = vlan_exit_net,
 622         .id   = &vlan_net_id,
 623         .size = sizeof(struct vlan_net),
 624 };
 625
 626 static int __init vlan_proto_init(void)
 627 {
 628         int err;
 629
 630         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 631
 632         err = register_pernet_subsys(&vlan_net_ops);
 633         if (err < 0)
 634                 goto err0;
 635
 636         err = register_netdevice_notifier(&vlan_notifier_block);
 637         if (err < 0)
 638                 goto err2;
 639
 640         err = vlan_gvrp_init();
 641         if (err < 0)
 642                 goto err3;
 643
 644         err = vlan_mvrp_init();
 645         if (err < 0)
 646                 goto err4;
 647
 648         err = vlan_netlink_init();
 649         if (err < 0)
 650                 goto err5;
 651
 652         vlan_ioctl_set(vlan_ioctl_handler);
 653         return 0;
 654
 655 err5:
 656         vlan_mvrp_uninit();
 657 err4:
 658         vlan_gvrp_uninit();
 659 err3:
 660         unregister_netdevice_notifier(&vlan_notifier_block);
 661 err2:
 662         unregister_pernet_subsys(&vlan_net_ops);
 663 err0:
 664         return err;
 665 }
 666
 667 static void __exit vlan_cleanup_module(void)
 668 {
 669         vlan_ioctl_set(NULL);
 670         vlan_netlink_fini();
 671
 672         unregister_netdevice_notifier(&vlan_notifier_block);
 673
 674         unregister_pernet_subsys(&vlan_net_ops);
 675         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 676
 677         vlan_mvrp_uninit();
 678         vlan_gvrp_uninit();
 679 }
 680
 681 module_init(vlan_proto_init);
 682 module_exit(vlan_cleanup_module);
 683
 684 MODULE_LICENSE("GPL");
 685 MODULE_VERSION(DRV_VERSION);