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, 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
  74 void 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         netdev_upper_dev_unlink(real_dev, dev);
 109
 110         if (grp->nr_vlan_devs == 0)
 111                 vlan_gvrp_uninit_applicant(real_dev);
 112
 113         /* Get rid of the vlan's reference to real_dev */
 114         dev_put(real_dev);
 115 }
 116
 117 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 118 {
 119         const char *name = real_dev->name;
 120         const struct net_device_ops *ops = real_dev->netdev_ops;
 121
 122         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 123                 pr_info("VLANs not supported on %s\n", name);
 124                 return -EOPNOTSUPP;
 125         }
 126
 127         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 128             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 129                 pr_info("Device %s has buggy VLAN hw accel\n", name);
 130                 return -EOPNOTSUPP;
 131         }
 132
 133         if (vlan_find_dev(real_dev, vlan_id) != NULL)
 134                 return -EEXIST;
 135
 136         return 0;
 137 }
 138
 139 int register_vlan_dev(struct net_device *dev)
 140 {
 141         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 142         struct net_device *real_dev = vlan->real_dev;
 143         u16 vlan_id = vlan->vlan_id;
 144         struct vlan_info *vlan_info;
 145         struct vlan_group *grp;
 146         int err;
 147
 148         err = vlan_vid_add(real_dev, vlan_id);
 149         if (err)
 150                 return err;
 151
 152         vlan_info = rtnl_dereference(real_dev->vlan_info);
 153         /* vlan_info should be there now. vlan_vid_add took care of it */
 154         BUG_ON(!vlan_info);
 155
 156         grp = &vlan_info->grp;
 157         if (grp->nr_vlan_devs == 0) {
 158                 err = vlan_gvrp_init_applicant(real_dev);
 159                 if (err < 0)
 160                         goto out_vid_del;
 161         }
 162
 163         err = vlan_group_prealloc_vid(grp, vlan_id);
 164         if (err < 0)
 165                 goto out_uninit_applicant;
 166
 167         err = netdev_upper_dev_link(real_dev, dev);
 168         if (err)
 169                 goto out_uninit_applicant;
 170
 171         err = register_netdevice(dev);
 172         if (err < 0)
 173                 goto out_upper_dev_unlink;
 174
 175         /* Account for reference in struct vlan_dev_priv */
 176         dev_hold(real_dev);
 177
 178         netif_stacked_transfer_operstate(real_dev, dev);
 179         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 180
 181         /* So, got the sucker initialized, now lets place
 182          * it into our local structure.
 183          */
 184         vlan_group_set_device(grp, vlan_id, dev);
 185         grp->nr_vlan_devs++;
 186
 187         return 0;
 188
 189 out_upper_dev_unlink:
 190         netdev_upper_dev_unlink(real_dev, dev);
 191 out_uninit_applicant:
 192         if (grp->nr_vlan_devs == 0)
 193                 vlan_gvrp_uninit_applicant(real_dev);
 194 out_vid_del:
 195         vlan_vid_del(real_dev, vlan_id);
 196         return err;
 197 }
 198
 199 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 200  *  Returns 0 if the device was created or a negative error code otherwise.
 201  */
 202 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 203 {
 204         struct net_device *new_dev;
 205         struct net *net = dev_net(real_dev);
 206         struct vlan_net *vn = net_generic(net, vlan_net_id);
 207         char name[IFNAMSIZ];
 208         int err;
 209
 210         if (vlan_id >= VLAN_VID_MASK)
 211                 return -ERANGE;
 212
 213         err = vlan_check_real_dev(real_dev, vlan_id);
 214         if (err < 0)
 215                 return err;
 216
 217         /* Gotta set up the fields for the device. */
 218         switch (vn->name_type) {
 219         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 220                 /* name will look like:  eth1.0005 */
 221                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 222                 break;
 223         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 224                 /* Put our vlan.VID in the name.
 225                  * Name will look like:  vlan5
 226                  */
 227                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 228                 break;
 229         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 230                 /* Put our vlan.VID in the name.
 231                  * Name will look like:  eth0.5
 232                  */
 233                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 234                 break;
 235         case VLAN_NAME_TYPE_PLUS_VID:
 236                 /* Put our vlan.VID in the name.
 237                  * Name will look like:  vlan0005
 238                  */
 239         default:
 240                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 241         }
 242
 243         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
 244
 245         if (new_dev == NULL)
 246                 return -ENOBUFS;
 247
 248         dev_net_set(new_dev, net);
 249         /* need 4 bytes for extra VLAN header info,
 250          * hope the underlying device can handle it.
 251          */
 252         new_dev->mtu = real_dev->mtu;
 253         new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
 254
 255         vlan_dev_priv(new_dev)->vlan_id = vlan_id;
 256         vlan_dev_priv(new_dev)->real_dev = real_dev;
 257         vlan_dev_priv(new_dev)->dent = NULL;
 258         vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 259
 260         new_dev->rtnl_link_ops = &vlan_link_ops;
 261         err = register_vlan_dev(new_dev);
 262         if (err < 0)
 263                 goto out_free_newdev;
 264
 265         return 0;
 266
 267 out_free_newdev:
 268         free_netdev(new_dev);
 269         return err;
 270 }
 271
 272 static void vlan_sync_address(struct net_device *dev,
 273                               struct net_device *vlandev)
 274 {
 275         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 276
 277         /* May be called without an actual change */
 278         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 279                 return;
 280
 281         /* vlan address was different from the old address and is equal to
 282          * the new address */
 283         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 284             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 285                 dev_uc_del(dev, vlandev->dev_addr);
 286
 287         /* vlan address was equal to the old address and is different from
 288          * the new address */
 289         if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 290             !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 291                 dev_uc_add(dev, vlandev->dev_addr);
 292
 293         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 294 }
 295
 296 static void vlan_transfer_features(struct net_device *dev,
 297                                    struct net_device *vlandev)
 298 {
 299         vlandev->gso_max_size = dev->gso_max_size;
 300
 301         if (dev->features & NETIF_F_HW_VLAN_TX)
 302                 vlandev->hard_header_len = dev->hard_header_len;
 303         else
 304                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 305
 306 #if IS_ENABLED(CONFIG_FCOE)
 307         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 308 #endif
 309
 310         netdev_update_features(vlandev);
 311 }
 312
 313 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 314 {
 315         switch (event) {
 316         case NETDEV_CHANGENAME:
 317                 vlan_proc_rem_dev(dev);
 318                 if (vlan_proc_add_dev(dev) < 0)
 319                         pr_warn("failed to change proc name for %s\n",
 320                                 dev->name);
 321                 break;
 322         case NETDEV_REGISTER:
 323                 if (vlan_proc_add_dev(dev) < 0)
 324                         pr_warn("failed to add proc entry for %s\n", dev->name);
 325                 break;
 326         case NETDEV_UNREGISTER:
 327                 vlan_proc_rem_dev(dev);
 328                 break;
 329         }
 330 }
 331
 332 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 333                              void *ptr)
 334 {
 335         struct net_device *dev = ptr;
 336         struct vlan_group *grp;
 337         struct vlan_info *vlan_info;
 338         int i, flgs;
 339         struct net_device *vlandev;
 340         struct vlan_dev_priv *vlan;
 341         LIST_HEAD(list);
 342
 343         if (is_vlan_dev(dev))
 344                 __vlan_device_event(dev, event);
 345
 346         if ((event == NETDEV_UP) &&
 347             (dev->features & NETIF_F_HW_VLAN_FILTER)) {
 348                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 349                         dev->name);
 350                 vlan_vid_add(dev, 0);
 351         }
 352
 353         vlan_info = rtnl_dereference(dev->vlan_info);
 354         if (!vlan_info)
 355                 goto out;
 356         grp = &vlan_info->grp;
 357
 358         /* It is OK that we do not hold the group lock right now,
 359          * as we run under the RTNL lock.
 360          */
 361
 362         switch (event) {
 363         case NETDEV_CHANGE:
 364                 /* Propagate real device state to vlan devices */
 365                 for (i = 0; i < VLAN_N_VID; i++) {
 366                         vlandev = vlan_group_get_device(grp, i);
 367                         if (!vlandev)
 368                                 continue;
 369
 370                         netif_stacked_transfer_operstate(dev, vlandev);
 371                 }
 372                 break;
 373
 374         case NETDEV_CHANGEADDR:
 375                 /* Adjust unicast filters on underlying device */
 376                 for (i = 0; i < VLAN_N_VID; i++) {
 377                         vlandev = vlan_group_get_device(grp, i);
 378                         if (!vlandev)
 379                                 continue;
 380
 381                         flgs = vlandev->flags;
 382                         if (!(flgs & IFF_UP))
 383                                 continue;
 384
 385                         vlan_sync_address(dev, vlandev);
 386                 }
 387                 break;
 388
 389         case NETDEV_CHANGEMTU:
 390                 for (i = 0; i < VLAN_N_VID; i++) {
 391                         vlandev = vlan_group_get_device(grp, i);
 392                         if (!vlandev)
 393                                 continue;
 394
 395                         if (vlandev->mtu <= dev->mtu)
 396                                 continue;
 397
 398                         dev_set_mtu(vlandev, dev->mtu);
 399                 }
 400                 break;
 401
 402         case NETDEV_FEAT_CHANGE:
 403                 /* Propagate device features to underlying device */
 404                 for (i = 0; i < VLAN_N_VID; i++) {
 405                         vlandev = vlan_group_get_device(grp, i);
 406                         if (!vlandev)
 407                                 continue;
 408
 409                         vlan_transfer_features(dev, vlandev);
 410                 }
 411
 412                 break;
 413
 414         case NETDEV_DOWN:
 415                 if (dev->features & NETIF_F_HW_VLAN_FILTER)
 416                         vlan_vid_del(dev, 0);
 417
 418                 /* Put all VLANs for this dev in the down state too.  */
 419                 for (i = 0; i < VLAN_N_VID; i++) {
 420                         vlandev = vlan_group_get_device(grp, i);
 421                         if (!vlandev)
 422                                 continue;
 423
 424                         flgs = vlandev->flags;
 425                         if (!(flgs & IFF_UP))
 426                                 continue;
 427
 428                         vlan = vlan_dev_priv(vlandev);
 429                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 430                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 431                         netif_stacked_transfer_operstate(dev, vlandev);
 432                 }
 433                 break;
 434
 435         case NETDEV_UP:
 436                 /* Put all VLANs for this dev in the up state too.  */
 437                 for (i = 0; i < VLAN_N_VID; i++) {
 438                         vlandev = vlan_group_get_device(grp, i);
 439                         if (!vlandev)
 440                                 continue;
 441
 442                         flgs = vlandev->flags;
 443                         if (flgs & IFF_UP)
 444                                 continue;
 445
 446                         vlan = vlan_dev_priv(vlandev);
 447                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 448                                 dev_change_flags(vlandev, flgs | IFF_UP);
 449                         netif_stacked_transfer_operstate(dev, vlandev);
 450                 }
 451                 break;
 452
 453         case NETDEV_UNREGISTER:
 454                 /* twiddle thumbs on netns device moves */
 455                 if (dev->reg_state != NETREG_UNREGISTERING)
 456                         break;
 457
 458                 for (i = 0; i < VLAN_N_VID; i++) {
 459                         vlandev = vlan_group_get_device(grp, i);
 460                         if (!vlandev)
 461                                 continue;
 462
 463                         /* removal of last vid destroys vlan_info, abort
 464                          * afterwards */
 465                         if (vlan_info->nr_vids == 1)
 466                                 i = VLAN_N_VID;
 467
 468                         unregister_vlan_dev(vlandev, &list);
 469                 }
 470                 unregister_netdevice_many(&list);
 471                 break;
 472
 473         case NETDEV_PRE_TYPE_CHANGE:
 474                 /* Forbid underlaying device to change its type. */
 475                 if (vlan_uses_dev(dev))
 476                         return NOTIFY_BAD;
 477                 break;
 478
 479         case NETDEV_NOTIFY_PEERS:
 480         case NETDEV_BONDING_FAILOVER:
 481                 /* Propagate to vlan devices */
 482                 for (i = 0; i < VLAN_N_VID; i++) {
 483                         vlandev = vlan_group_get_device(grp, i);
 484                         if (!vlandev)
 485                                 continue;
 486
 487                         call_netdevice_notifiers(event, vlandev);
 488                 }
 489                 break;
 490         }
 491
 492 out:
 493         return NOTIFY_DONE;
 494 }
 495
 496 static struct notifier_block vlan_notifier_block __read_mostly = {
 497         .notifier_call = vlan_device_event,
 498 };
 499
 500 /*
 501  *      VLAN IOCTL handler.
 502  *      o execute requested action or pass command to the device driver
 503  *   arg is really a struct vlan_ioctl_args __user *.
 504  */
 505 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 506 {
 507         int err;
 508         struct vlan_ioctl_args args;
 509         struct net_device *dev = NULL;
 510
 511         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 512                 return -EFAULT;
 513
 514         /* Null terminate this sucker, just in case. */
 515         args.device1[23] = 0;
 516         args.u.device2[23] = 0;
 517
 518         rtnl_lock();
 519
 520         switch (args.cmd) {
 521         case SET_VLAN_INGRESS_PRIORITY_CMD:
 522         case SET_VLAN_EGRESS_PRIORITY_CMD:
 523         case SET_VLAN_FLAG_CMD:
 524         case ADD_VLAN_CMD:
 525         case DEL_VLAN_CMD:
 526         case GET_VLAN_REALDEV_NAME_CMD:
 527         case GET_VLAN_VID_CMD:
 528                 err = -ENODEV;
 529                 dev = __dev_get_by_name(net, args.device1);
 530                 if (!dev)
 531                         goto out;
 532
 533                 err = -EINVAL;
 534                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 535                         goto out;
 536         }
 537
 538         switch (args.cmd) {
 539         case SET_VLAN_INGRESS_PRIORITY_CMD:
 540                 err = -EPERM;
 541                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 542                         break;
 543                 vlan_dev_set_ingress_priority(dev,
 544                                               args.u.skb_priority,
 545                                               args.vlan_qos);
 546                 err = 0;
 547                 break;
 548
 549         case SET_VLAN_EGRESS_PRIORITY_CMD:
 550                 err = -EPERM;
 551                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 552                         break;
 553                 err = vlan_dev_set_egress_priority(dev,
 554                                                    args.u.skb_priority,
 555                                                    args.vlan_qos);
 556                 break;
 557
 558         case SET_VLAN_FLAG_CMD:
 559                 err = -EPERM;
 560                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 561                         break;
 562                 err = vlan_dev_change_flags(dev,
 563                                             args.vlan_qos ? args.u.flag : 0,
 564                                             args.u.flag);
 565                 break;
 566
 567         case SET_VLAN_NAME_TYPE_CMD:
 568                 err = -EPERM;
 569                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 570                         break;
 571                 if ((args.u.name_type >= 0) &&
 572                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 573                         struct vlan_net *vn;
 574
 575                         vn = net_generic(net, vlan_net_id);
 576                         vn->name_type = args.u.name_type;
 577                         err = 0;
 578                 } else {
 579                         err = -EINVAL;
 580                 }
 581                 break;
 582
 583         case ADD_VLAN_CMD:
 584                 err = -EPERM;
 585                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 586                         break;
 587                 err = register_vlan_device(dev, args.u.VID);
 588                 break;
 589
 590         case DEL_VLAN_CMD:
 591                 err = -EPERM;
 592                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 593                         break;
 594                 unregister_vlan_dev(dev, NULL);
 595                 err = 0;
 596                 break;
 597
 598         case GET_VLAN_REALDEV_NAME_CMD:
 599                 err = 0;
 600                 vlan_dev_get_realdev_name(dev, args.u.device2);
 601                 if (copy_to_user(arg, &args,
 602                                  sizeof(struct vlan_ioctl_args)))
 603                         err = -EFAULT;
 604                 break;
 605
 606         case GET_VLAN_VID_CMD:
 607                 err = 0;
 608                 args.u.VID = vlan_dev_vlan_id(dev);
 609                 if (copy_to_user(arg, &args,
 610                                  sizeof(struct vlan_ioctl_args)))
 611                       err = -EFAULT;
 612                 break;
 613
 614         default:
 615                 err = -EOPNOTSUPP;
 616                 break;
 617         }
 618 out:
 619         rtnl_unlock();
 620         return err;
 621 }
 622
 623 static int __net_init vlan_init_net(struct net *net)
 624 {
 625         struct vlan_net *vn = net_generic(net, vlan_net_id);
 626         int err;
 627
 628         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 629
 630         err = vlan_proc_init(net);
 631
 632         return err;
 633 }
 634
 635 static void __net_exit vlan_exit_net(struct net *net)
 636 {
 637         vlan_proc_cleanup(net);
 638 }
 639
 640 static struct pernet_operations vlan_net_ops = {
 641         .init = vlan_init_net,
 642         .exit = vlan_exit_net,
 643         .id   = &vlan_net_id,
 644         .size = sizeof(struct vlan_net),
 645 };
 646
 647 static int __init vlan_proto_init(void)
 648 {
 649         int err;
 650
 651         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 652
 653         err = register_pernet_subsys(&vlan_net_ops);
 654         if (err < 0)
 655                 goto err0;
 656
 657         err = register_netdevice_notifier(&vlan_notifier_block);
 658         if (err < 0)
 659                 goto err2;
 660
 661         err = vlan_gvrp_init();
 662         if (err < 0)
 663                 goto err3;
 664
 665         err = vlan_netlink_init();
 666         if (err < 0)
 667                 goto err4;
 668
 669         vlan_ioctl_set(vlan_ioctl_handler);
 670         return 0;
 671
 672 err4:
 673         vlan_gvrp_uninit();
 674 err3:
 675         unregister_netdevice_notifier(&vlan_notifier_block);
 676 err2:
 677         unregister_pernet_subsys(&vlan_net_ops);
 678 err0:
 679         return err;
 680 }
 681
 682 static void __exit vlan_cleanup_module(void)
 683 {
 684         vlan_ioctl_set(NULL);
 685         vlan_netlink_fini();
 686
 687         unregister_netdevice_notifier(&vlan_notifier_block);
 688
 689         unregister_pernet_subsys(&vlan_net_ops);
 690         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 691
 692         vlan_gvrp_uninit();
 693 }
 694
 695 module_init(vlan_proto_init);
 696 module_exit(vlan_cleanup_module);
 697
 698 MODULE_LICENSE("GPL");
 699 MODULE_VERSION(DRV_VERSION);