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         /* Because unregister_netdevice_queue() makes sure at least one rcu
 102          * grace period is respected before device freeing,
 103          * we dont need to call synchronize_net() here.
 104          */
 105         unregister_netdevice_queue(dev, head);
 106
 107         netdev_upper_dev_unlink(real_dev, dev);
 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 = netdev_upper_dev_link(real_dev, dev);
 173         if (err)
 174                 goto out_uninit_mvrp;
 175
 176         err = register_netdevice(dev);
 177         if (err < 0)
 178                 goto out_upper_dev_unlink;
 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_upper_dev_unlink:
 195         netdev_upper_dev_unlink(real_dev, 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 net *net = dev_net(real_dev);
 214         struct vlan_net *vn = net_generic(net, vlan_net_id);
 215         char name[IFNAMSIZ];
 216         int err;
 217
 218         if (vlan_id >= VLAN_VID_MASK)
 219                 return -ERANGE;
 220
 221         err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
 222         if (err < 0)
 223                 return err;
 224
 225         /* Gotta set up the fields for the device. */
 226         switch (vn->name_type) {
 227         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 228                 /* name will look like:  eth1.0005 */
 229                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 230                 break;
 231         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 232                 /* Put our vlan.VID in the name.
 233                  * Name will look like:  vlan5
 234                  */
 235                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 236                 break;
 237         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 238                 /* Put our vlan.VID in the name.
 239                  * Name will look like:  eth0.5
 240                  */
 241                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 242                 break;
 243         case VLAN_NAME_TYPE_PLUS_VID:
 244                 /* Put our vlan.VID in the name.
 245                  * Name will look like:  vlan0005
 246                  */
 247         default:
 248                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 249         }
 250
 251         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
 252
 253         if (new_dev == NULL)
 254                 return -ENOBUFS;
 255
 256         dev_net_set(new_dev, net);
 257         /* need 4 bytes for extra VLAN header info,
 258          * hope the underlying device can handle it.
 259          */
 260         new_dev->mtu = real_dev->mtu;
 261         new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
 262
 263         vlan_dev_priv(new_dev)->vlan_proto = htons(ETH_P_8021Q);
 264         vlan_dev_priv(new_dev)->vlan_id = vlan_id;
 265         vlan_dev_priv(new_dev)->real_dev = real_dev;
 266         vlan_dev_priv(new_dev)->dent = NULL;
 267         vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 268
 269         new_dev->rtnl_link_ops = &vlan_link_ops;
 270         err = register_vlan_dev(new_dev);
 271         if (err < 0)
 272                 goto out_free_newdev;
 273
 274         return 0;
 275
 276 out_free_newdev:
 277         free_netdev(new_dev);
 278         return err;
 279 }
 280
 281 static void vlan_sync_address(struct net_device *dev,
 282                               struct net_device *vlandev)
 283 {
 284         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 285
 286         /* May be called without an actual change */
 287         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 288                 return;
 289
 290         /* vlan address was different from the old address and is equal to
 291          * the new address */
 292         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 293             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 294                 dev_uc_del(dev, vlandev->dev_addr);
 295
 296         /* vlan address was equal to the old address and is different from
 297          * the new address */
 298         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 299             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 300                 dev_uc_add(dev, vlandev->dev_addr);
 301
 302         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 303 }
 304
 305 static void vlan_transfer_features(struct net_device *dev,
 306                                    struct net_device *vlandev)
 307 {
 308         vlandev->gso_max_size = dev->gso_max_size;
 309
 310         if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
 311                 vlandev->hard_header_len = dev->hard_header_len;
 312         else
 313                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 314
 315 #if IS_ENABLED(CONFIG_FCOE)
 316         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 317 #endif
 318
 319         netdev_update_features(vlandev);
 320 }
 321
 322 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 323 {
 324         switch (event) {
 325         case NETDEV_CHANGENAME:
 326                 vlan_proc_rem_dev(dev);
 327                 if (vlan_proc_add_dev(dev) < 0)
 328                         pr_warn("failed to change proc name for %s\n",
 329                                 dev->name);
 330                 break;
 331         case NETDEV_REGISTER:
 332                 if (vlan_proc_add_dev(dev) < 0)
 333                         pr_warn("failed to add proc entry for %s\n", dev->name);
 334                 break;
 335         case NETDEV_UNREGISTER:
 336                 vlan_proc_rem_dev(dev);
 337                 break;
 338         }
 339 }
 340
 341 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 342                              void *ptr)
 343 {
 344         struct net_device *dev = ptr;
 345         struct vlan_group *grp;
 346         struct vlan_info *vlan_info;
 347         int i, flgs;
 348         struct net_device *vlandev;
 349         struct vlan_dev_priv *vlan;
 350         bool last = false;
 351         LIST_HEAD(list);
 352
 353         if (is_vlan_dev(dev))
 354                 __vlan_device_event(dev, event);
 355
 356         if ((event == NETDEV_UP) &&
 357             (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 358                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 359                         dev->name);
 360                 vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
 361         }
 362
 363         vlan_info = rtnl_dereference(dev->vlan_info);
 364         if (!vlan_info)
 365                 goto out;
 366         grp = &vlan_info->grp;
 367
 368         /* It is OK that we do not hold the group lock right now,
 369          * as we run under the RTNL lock.
 370          */
 371
 372         switch (event) {
 373         case NETDEV_CHANGE:
 374                 /* Propagate real device state to vlan devices */
 375                 vlan_group_for_each_dev(grp, i, vlandev)
 376                         netif_stacked_transfer_operstate(dev, vlandev);
 377                 break;
 378
 379         case NETDEV_CHANGEADDR:
 380                 /* Adjust unicast filters on underlying device */
 381                 vlan_group_for_each_dev(grp, i, vlandev) {
 382                         flgs = vlandev->flags;
 383                         if (!(flgs & IFF_UP))
 384                                 continue;
 385
 386                         vlan_sync_address(dev, vlandev);
 387                 }
 388                 break;
 389
 390         case NETDEV_CHANGEMTU:
 391                 vlan_group_for_each_dev(grp, i, vlandev) {
 392                         if (vlandev->mtu <= dev->mtu)
 393                                 continue;
 394
 395                         dev_set_mtu(vlandev, dev->mtu);
 396                 }
 397                 break;
 398
 399         case NETDEV_FEAT_CHANGE:
 400                 /* Propagate device features to underlying device */
 401                 vlan_group_for_each_dev(grp, i, vlandev)
 402                         vlan_transfer_features(dev, vlandev);
 403                 break;
 404
 405         case NETDEV_DOWN:
 406                 if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
 407                         vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
 408
 409                 /* Put all VLANs for this dev in the down state too.  */
 410                 vlan_group_for_each_dev(grp, i, vlandev) {
 411                         flgs = vlandev->flags;
 412                         if (!(flgs & IFF_UP))
 413                                 continue;
 414
 415                         vlan = vlan_dev_priv(vlandev);
 416                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 417                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 418                         netif_stacked_transfer_operstate(dev, vlandev);
 419                 }
 420                 break;
 421
 422         case NETDEV_UP:
 423                 /* Put all VLANs for this dev in the up state too.  */
 424                 vlan_group_for_each_dev(grp, i, vlandev) {
 425                         flgs = vlandev->flags;
 426                         if (flgs & IFF_UP)
 427                                 continue;
 428
 429                         vlan = vlan_dev_priv(vlandev);
 430                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 431                                 dev_change_flags(vlandev, flgs | IFF_UP);
 432                         netif_stacked_transfer_operstate(dev, vlandev);
 433                 }
 434                 break;
 435
 436         case NETDEV_UNREGISTER:
 437                 /* twiddle thumbs on netns device moves */
 438                 if (dev->reg_state != NETREG_UNREGISTERING)
 439                         break;
 440
 441                 vlan_group_for_each_dev(grp, i, vlandev) {
 442                         /* removal of last vid destroys vlan_info, abort
 443                          * afterwards */
 444                         if (vlan_info->nr_vids == 1)
 445                                 last = true;
 446
 447                         unregister_vlan_dev(vlandev, &list);
 448                         if (last)
 449                                 break;
 450                 }
 451                 unregister_netdevice_many(&list);
 452                 break;
 453
 454         case NETDEV_PRE_TYPE_CHANGE:
 455                 /* Forbid underlaying device to change its type. */
 456                 if (vlan_uses_dev(dev))
 457                         return NOTIFY_BAD;
 458                 break;
 459
 460         case NETDEV_NOTIFY_PEERS:
 461         case NETDEV_BONDING_FAILOVER:
 462                 /* Propagate to vlan devices */
 463                 vlan_group_for_each_dev(grp, i, vlandev)
 464                         call_netdevice_notifiers(event, vlandev);
 465                 break;
 466         }
 467
 468 out:
 469         return NOTIFY_DONE;
 470 }
 471
 472 static struct notifier_block vlan_notifier_block __read_mostly = {
 473         .notifier_call = vlan_device_event,
 474 };
 475
 476 /*
 477  *      VLAN IOCTL handler.
 478  *      o execute requested action or pass command to the device driver
 479  *   arg is really a struct vlan_ioctl_args __user *.
 480  */
 481 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 482 {
 483         int err;
 484         struct vlan_ioctl_args args;
 485         struct net_device *dev = NULL;
 486
 487         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 488                 return -EFAULT;
 489
 490         /* Null terminate this sucker, just in case. */
 491         args.device1[23] = 0;
 492         args.u.device2[23] = 0;
 493
 494         rtnl_lock();
 495
 496         switch (args.cmd) {
 497         case SET_VLAN_INGRESS_PRIORITY_CMD:
 498         case SET_VLAN_EGRESS_PRIORITY_CMD:
 499         case SET_VLAN_FLAG_CMD:
 500         case ADD_VLAN_CMD:
 501         case DEL_VLAN_CMD:
 502         case GET_VLAN_REALDEV_NAME_CMD:
 503         case GET_VLAN_VID_CMD:
 504                 err = -ENODEV;
 505                 dev = __dev_get_by_name(net, args.device1);
 506                 if (!dev)
 507                         goto out;
 508
 509                 err = -EINVAL;
 510                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 511                         goto out;
 512         }
 513
 514         switch (args.cmd) {
 515         case SET_VLAN_INGRESS_PRIORITY_CMD:
 516                 err = -EPERM;
 517                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 518                         break;
 519                 vlan_dev_set_ingress_priority(dev,
 520                                               args.u.skb_priority,
 521                                               args.vlan_qos);
 522                 err = 0;
 523                 break;
 524
 525         case SET_VLAN_EGRESS_PRIORITY_CMD:
 526                 err = -EPERM;
 527                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 528                         break;
 529                 err = vlan_dev_set_egress_priority(dev,
 530                                                    args.u.skb_priority,
 531                                                    args.vlan_qos);
 532                 break;
 533
 534         case SET_VLAN_FLAG_CMD:
 535                 err = -EPERM;
 536                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 537                         break;
 538                 err = vlan_dev_change_flags(dev,
 539                                             args.vlan_qos ? args.u.flag : 0,
 540                                             args.u.flag);
 541                 break;
 542
 543         case SET_VLAN_NAME_TYPE_CMD:
 544                 err = -EPERM;
 545                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 546                         break;
 547                 if ((args.u.name_type >= 0) &&
 548                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 549                         struct vlan_net *vn;
 550
 551                         vn = net_generic(net, vlan_net_id);
 552                         vn->name_type = args.u.name_type;
 553                         err = 0;
 554                 } else {
 555                         err = -EINVAL;
 556                 }
 557                 break;
 558
 559         case ADD_VLAN_CMD:
 560                 err = -EPERM;
 561                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 562                         break;
 563                 err = register_vlan_device(dev, args.u.VID);
 564                 break;
 565
 566         case DEL_VLAN_CMD:
 567                 err = -EPERM;
 568                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 569                         break;
 570                 unregister_vlan_dev(dev, NULL);
 571                 err = 0;
 572                 break;
 573
 574         case GET_VLAN_REALDEV_NAME_CMD:
 575                 err = 0;
 576                 vlan_dev_get_realdev_name(dev, args.u.device2);
 577                 if (copy_to_user(arg, &args,
 578                                  sizeof(struct vlan_ioctl_args)))
 579                         err = -EFAULT;
 580                 break;
 581
 582         case GET_VLAN_VID_CMD:
 583                 err = 0;
 584                 args.u.VID = vlan_dev_vlan_id(dev);
 585                 if (copy_to_user(arg, &args,
 586                                  sizeof(struct vlan_ioctl_args)))
 587                       err = -EFAULT;
 588                 break;
 589
 590         default:
 591                 err = -EOPNOTSUPP;
 592                 break;
 593         }
 594 out:
 595         rtnl_unlock();
 596         return err;
 597 }
 598
 599 static int __net_init vlan_init_net(struct net *net)
 600 {
 601         struct vlan_net *vn = net_generic(net, vlan_net_id);
 602         int err;
 603
 604         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 605
 606         err = vlan_proc_init(net);
 607
 608         return err;
 609 }
 610
 611 static void __net_exit vlan_exit_net(struct net *net)
 612 {
 613         vlan_proc_cleanup(net);
 614 }
 615
 616 static struct pernet_operations vlan_net_ops = {
 617         .init = vlan_init_net,
 618         .exit = vlan_exit_net,
 619         .id   = &vlan_net_id,
 620         .size = sizeof(struct vlan_net),
 621 };
 622
 623 static int __init vlan_proto_init(void)
 624 {
 625         int err;
 626
 627         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 628
 629         err = register_pernet_subsys(&vlan_net_ops);
 630         if (err < 0)
 631                 goto err0;
 632
 633         err = register_netdevice_notifier(&vlan_notifier_block);
 634         if (err < 0)
 635                 goto err2;
 636
 637         err = vlan_gvrp_init();
 638         if (err < 0)
 639                 goto err3;
 640
 641         err = vlan_mvrp_init();
 642         if (err < 0)
 643                 goto err4;
 644
 645         err = vlan_netlink_init();
 646         if (err < 0)
 647                 goto err5;
 648
 649         vlan_ioctl_set(vlan_ioctl_handler);
 650         return 0;
 651
 652 err5:
 653         vlan_mvrp_uninit();
 654 err4:
 655         vlan_gvrp_uninit();
 656 err3:
 657         unregister_netdevice_notifier(&vlan_notifier_block);
 658 err2:
 659         unregister_pernet_subsys(&vlan_net_ops);
 660 err0:
 661         return err;
 662 }
 663
 664 static void __exit vlan_cleanup_module(void)
 665 {
 666         vlan_ioctl_set(NULL);
 667         vlan_netlink_fini();
 668
 669         unregister_netdevice_notifier(&vlan_notifier_block);
 670
 671         unregister_pernet_subsys(&vlan_net_ops);
 672         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 673
 674         vlan_mvrp_uninit();
 675         vlan_gvrp_uninit();
 676 }
 677
 678 module_init(vlan_proto_init);
 679 module_exit(vlan_cleanup_module);
 680
 681 MODULE_LICENSE("GPL");
 682 MODULE_VERSION(DRV_VERSION);