net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <[email protected]>
   6  *              Please send support related email to: [email protected]
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <[email protected]>;
  11  *              Add HW acceleration hooks - David S. Miller <[email protected]>;
  12  *              Correct all the locking - David S. Miller <[email protected]>;
  13  *              Use hash table for VLAN groups - David S. Miller <[email protected]>
  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_MVRP)
  99                 vlan_mvrp_request_leave(dev);
 100         if (vlan->flags & VLAN_FLAG_GVRP)
 101                 vlan_gvrp_request_leave(dev);
 102
 103         vlan_group_set_device(grp, vlan_id, NULL);
 104         /* Because unregister_netdevice_queue() makes sure at least one rcu
 105          * grace period is respected before device freeing,
 106          * we dont need to call synchronize_net() here.
 107          */
 108         unregister_netdevice_queue(dev, head);
 109
 110         netdev_upper_dev_unlink(real_dev, dev);
 111
 112         if (grp->nr_vlan_devs == 0) {
 113                 vlan_mvrp_uninit_applicant(real_dev);
 114                 vlan_gvrp_uninit_applicant(real_dev);
 115         }
 116
 117         /* Get rid of the vlan's reference to real_dev */
 118         dev_put(real_dev);
 119 }
 120
 121 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 122 {
 123         const char *name = real_dev->name;
 124
 125         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 126                 pr_info("VLANs not supported on %s\n", name);
 127                 return -EOPNOTSUPP;
 128         }
 129
 130         if (vlan_find_dev(real_dev, vlan_id) != NULL)
 131                 return -EEXIST;
 132
 133         return 0;
 134 }
 135
 136 int register_vlan_dev(struct net_device *dev)
 137 {
 138         struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
 139         struct net_device *real_dev = vlan->real_dev;
 140         u16 vlan_id = vlan->vlan_id;
 141         struct vlan_info *vlan_info;
 142         struct vlan_group *grp;
 143         int err;
 144
 145         err = vlan_vid_add(real_dev, vlan_id);
 146         if (err)
 147                 return err;
 148
 149         vlan_info = rtnl_dereference(real_dev->vlan_info);
 150         /* vlan_info should be there now. vlan_vid_add took care of it */
 151         BUG_ON(!vlan_info);
 152
 153         grp = &vlan_info->grp;
 154         if (grp->nr_vlan_devs == 0) {
 155                 err = vlan_gvrp_init_applicant(real_dev);
 156                 if (err < 0)
 157                         goto out_vid_del;
 158                 err = vlan_mvrp_init_applicant(real_dev);
 159                 if (err < 0)
 160                         goto out_uninit_gvrp;
 161         }
 162
 163         err = vlan_group_prealloc_vid(grp, vlan_id);
 164         if (err < 0)
 165                 goto out_uninit_mvrp;
 166
 167         err = netdev_upper_dev_link(real_dev, dev);
 168         if (err)
 169                 goto out_uninit_mvrp;
 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_mvrp:
 192         if (grp->nr_vlan_devs == 0)
 193                 vlan_mvrp_uninit_applicant(real_dev);
 194 out_uninit_gvrp:
 195         if (grp->nr_vlan_devs == 0)
 196                 vlan_gvrp_uninit_applicant(real_dev);
 197 out_vid_del:
 198         vlan_vid_del(real_dev, vlan_id);
 199         return err;
 200 }
 201
 202 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 203  *  Returns 0 if the device was created or a negative error code otherwise.
 204  */
 205 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 206 {
 207         struct net_device *new_dev;
 208         struct net *net = dev_net(real_dev);
 209         struct vlan_net *vn = net_generic(net, vlan_net_id);
 210         char name[IFNAMSIZ];
 211         int err;
 212
 213         if (vlan_id >= VLAN_VID_MASK)
 214                 return -ERANGE;
 215
 216         err = vlan_check_real_dev(real_dev, vlan_id);
 217         if (err < 0)
 218                 return err;
 219
 220         /* Gotta set up the fields for the device. */
 221         switch (vn->name_type) {
 222         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 223                 /* name will look like:  eth1.0005 */
 224                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 225                 break;
 226         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 227                 /* Put our vlan.VID in the name.
 228                  * Name will look like:  vlan5
 229                  */
 230                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 231                 break;
 232         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 233                 /* Put our vlan.VID in the name.
 234                  * Name will look like:  eth0.5
 235                  */
 236                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 237                 break;
 238         case VLAN_NAME_TYPE_PLUS_VID:
 239                 /* Put our vlan.VID in the name.
 240                  * Name will look like:  vlan0005
 241                  */
 242         default:
 243                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 244         }
 245
 246         new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
 247
 248         if (new_dev == NULL)
 249                 return -ENOBUFS;
 250
 251         dev_net_set(new_dev, net);
 252         /* need 4 bytes for extra VLAN header info,
 253          * hope the underlying device can handle it.
 254          */
 255         new_dev->mtu = real_dev->mtu;
 256         new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
 257
 258         vlan_dev_priv(new_dev)->vlan_id = vlan_id;
 259         vlan_dev_priv(new_dev)->real_dev = real_dev;
 260         vlan_dev_priv(new_dev)->dent = NULL;
 261         vlan_dev_priv(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 262
 263         new_dev->rtnl_link_ops = &vlan_link_ops;
 264         err = register_vlan_dev(new_dev);
 265         if (err < 0)
 266                 goto out_free_newdev;
 267
 268         return 0;
 269
 270 out_free_newdev:
 271         free_netdev(new_dev);
 272         return err;
 273 }
 274
 275 static void vlan_sync_address(struct net_device *dev,
 276                               struct net_device *vlandev)
 277 {
 278         struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
 279
 280         /* May be called without an actual change */
 281         if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
 282                 return;
 283
 284         /* vlan address was different from the old address and is equal to
 285          * the new address */
 286         if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
 287             ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
 288                 dev_uc_del(dev, vlandev->dev_addr);
 289
 290         /* vlan address was equal to the old address and is different from
 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_add(dev, vlandev->dev_addr);
 295
 296         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 297 }
 298
 299 static void vlan_transfer_features(struct net_device *dev,
 300                                    struct net_device *vlandev)
 301 {
 302         vlandev->gso_max_size = dev->gso_max_size;
 303
 304         if (dev->features & NETIF_F_HW_VLAN_TX)
 305                 vlandev->hard_header_len = dev->hard_header_len;
 306         else
 307                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 308
 309 #if IS_ENABLED(CONFIG_FCOE)
 310         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 311 #endif
 312
 313         netdev_update_features(vlandev);
 314 }
 315
 316 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 317 {
 318         switch (event) {
 319         case NETDEV_CHANGENAME:
 320                 vlan_proc_rem_dev(dev);
 321                 if (vlan_proc_add_dev(dev) < 0)
 322                         pr_warn("failed to change proc name for %s\n",
 323                                 dev->name);
 324                 break;
 325         case NETDEV_REGISTER:
 326                 if (vlan_proc_add_dev(dev) < 0)
 327                         pr_warn("failed to add proc entry for %s\n", dev->name);
 328                 break;
 329         case NETDEV_UNREGISTER:
 330                 vlan_proc_rem_dev(dev);
 331                 break;
 332         }
 333 }
 334
 335 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 336                              void *ptr)
 337 {
 338         struct net_device *dev = ptr;
 339         struct vlan_group *grp;
 340         struct vlan_info *vlan_info;
 341         int i, flgs;
 342         struct net_device *vlandev;
 343         struct vlan_dev_priv *vlan;
 344         LIST_HEAD(list);
 345
 346         if (is_vlan_dev(dev))
 347                 __vlan_device_event(dev, event);
 348
 349         if ((event == NETDEV_UP) &&
 350             (dev->features & NETIF_F_HW_VLAN_FILTER)) {
 351                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 352                         dev->name);
 353                 vlan_vid_add(dev, 0);
 354         }
 355
 356         vlan_info = rtnl_dereference(dev->vlan_info);
 357         if (!vlan_info)
 358                 goto out;
 359         grp = &vlan_info->grp;
 360
 361         /* It is OK that we do not hold the group lock right now,
 362          * as we run under the RTNL lock.
 363          */
 364
 365         switch (event) {
 366         case NETDEV_CHANGE:
 367                 /* Propagate real device state to vlan devices */
 368                 for (i = 0; i < VLAN_N_VID; i++) {
 369                         vlandev = vlan_group_get_device(grp, i);
 370                         if (!vlandev)
 371                                 continue;
 372
 373                         netif_stacked_transfer_operstate(dev, vlandev);
 374                 }
 375                 break;
 376
 377         case NETDEV_CHANGEADDR:
 378                 /* Adjust unicast filters on underlying device */
 379                 for (i = 0; i < VLAN_N_VID; i++) {
 380                         vlandev = vlan_group_get_device(grp, i);
 381                         if (!vlandev)
 382                                 continue;
 383
 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                 for (i = 0; i < VLAN_N_VID; i++) {
 394                         vlandev = vlan_group_get_device(grp, i);
 395                         if (!vlandev)
 396                                 continue;
 397
 398                         if (vlandev->mtu <= dev->mtu)
 399                                 continue;
 400
 401                         dev_set_mtu(vlandev, dev->mtu);
 402                 }
 403                 break;
 404
 405         case NETDEV_FEAT_CHANGE:
 406                 /* Propagate device features to underlying device */
 407                 for (i = 0; i < VLAN_N_VID; i++) {
 408                         vlandev = vlan_group_get_device(grp, i);
 409                         if (!vlandev)
 410                                 continue;
 411
 412                         vlan_transfer_features(dev, vlandev);
 413                 }
 414
 415                 break;
 416
 417         case NETDEV_DOWN:
 418                 if (dev->features & NETIF_F_HW_VLAN_FILTER)
 419                         vlan_vid_del(dev, 0);
 420
 421                 /* Put all VLANs for this dev in the down state too.  */
 422                 for (i = 0; i < VLAN_N_VID; i++) {
 423                         vlandev = vlan_group_get_device(grp, i);
 424                         if (!vlandev)
 425                                 continue;
 426
 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_UP:
 439                 /* Put all VLANs for this dev in the up state too.  */
 440                 for (i = 0; i < VLAN_N_VID; i++) {
 441                         vlandev = vlan_group_get_device(grp, i);
 442                         if (!vlandev)
 443                                 continue;
 444
 445                         flgs = vlandev->flags;
 446                         if (flgs & IFF_UP)
 447                                 continue;
 448
 449                         vlan = vlan_dev_priv(vlandev);
 450                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 451                                 dev_change_flags(vlandev, flgs | IFF_UP);
 452                         netif_stacked_transfer_operstate(dev, vlandev);
 453                 }
 454                 break;
 455
 456         case NETDEV_UNREGISTER:
 457                 /* twiddle thumbs on netns device moves */
 458                 if (dev->reg_state != NETREG_UNREGISTERING)
 459                         break;
 460
 461                 for (i = 0; i < VLAN_N_VID; i++) {
 462                         vlandev = vlan_group_get_device(grp, i);
 463                         if (!vlandev)
 464                                 continue;
 465
 466                         /* removal of last vid destroys vlan_info, abort
 467                          * afterwards */
 468                         if (vlan_info->nr_vids == 1)
 469                                 i = VLAN_N_VID;
 470
 471                         unregister_vlan_dev(vlandev, &list);
 472                 }
 473                 unregister_netdevice_many(&list);
 474                 break;
 475
 476         case NETDEV_PRE_TYPE_CHANGE:
 477                 /* Forbid underlaying device to change its type. */
 478                 if (vlan_uses_dev(dev))
 479                         return NOTIFY_BAD;
 480                 break;
 481
 482         case NETDEV_NOTIFY_PEERS:
 483         case NETDEV_BONDING_FAILOVER:
 484                 /* Propagate to vlan devices */
 485                 for (i = 0; i < VLAN_N_VID; i++) {
 486                         vlandev = vlan_group_get_device(grp, i);
 487                         if (!vlandev)
 488                                 continue;
 489
 490                         call_netdevice_notifiers(event, vlandev);
 491                 }
 492                 break;
 493         }
 494
 495 out:
 496         return NOTIFY_DONE;
 497 }
 498
 499 static struct notifier_block vlan_notifier_block __read_mostly = {
 500         .notifier_call = vlan_device_event,
 501 };
 502
 503 /*
 504  *      VLAN IOCTL handler.
 505  *      o execute requested action or pass command to the device driver
 506  *   arg is really a struct vlan_ioctl_args __user *.
 507  */
 508 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 509 {
 510         int err;
 511         struct vlan_ioctl_args args;
 512         struct net_device *dev = NULL;
 513
 514         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 515                 return -EFAULT;
 516
 517         /* Null terminate this sucker, just in case. */
 518         args.device1[23] = 0;
 519         args.u.device2[23] = 0;
 520
 521         rtnl_lock();
 522
 523         switch (args.cmd) {
 524         case SET_VLAN_INGRESS_PRIORITY_CMD:
 525         case SET_VLAN_EGRESS_PRIORITY_CMD:
 526         case SET_VLAN_FLAG_CMD:
 527         case ADD_VLAN_CMD:
 528         case DEL_VLAN_CMD:
 529         case GET_VLAN_REALDEV_NAME_CMD:
 530         case GET_VLAN_VID_CMD:
 531                 err = -ENODEV;
 532                 dev = __dev_get_by_name(net, args.device1);
 533                 if (!dev)
 534                         goto out;
 535
 536                 err = -EINVAL;
 537                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 538                         goto out;
 539         }
 540
 541         switch (args.cmd) {
 542         case SET_VLAN_INGRESS_PRIORITY_CMD:
 543                 err = -EPERM;
 544                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 545                         break;
 546                 vlan_dev_set_ingress_priority(dev,
 547                                               args.u.skb_priority,
 548                                               args.vlan_qos);
 549                 err = 0;
 550                 break;
 551
 552         case SET_VLAN_EGRESS_PRIORITY_CMD:
 553                 err = -EPERM;
 554                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 555                         break;
 556                 err = vlan_dev_set_egress_priority(dev,
 557                                                    args.u.skb_priority,
 558                                                    args.vlan_qos);
 559                 break;
 560
 561         case SET_VLAN_FLAG_CMD:
 562                 err = -EPERM;
 563                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 564                         break;
 565                 err = vlan_dev_change_flags(dev,
 566                                             args.vlan_qos ? args.u.flag : 0,
 567                                             args.u.flag);
 568                 break;
 569
 570         case SET_VLAN_NAME_TYPE_CMD:
 571                 err = -EPERM;
 572                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 573                         break;
 574                 if ((args.u.name_type >= 0) &&
 575                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 576                         struct vlan_net *vn;
 577
 578                         vn = net_generic(net, vlan_net_id);
 579                         vn->name_type = args.u.name_type;
 580                         err = 0;
 581                 } else {
 582                         err = -EINVAL;
 583                 }
 584                 break;
 585
 586         case ADD_VLAN_CMD:
 587                 err = -EPERM;
 588                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 589                         break;
 590                 err = register_vlan_device(dev, args.u.VID);
 591                 break;
 592
 593         case DEL_VLAN_CMD:
 594                 err = -EPERM;
 595                 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
 596                         break;
 597                 unregister_vlan_dev(dev, NULL);
 598                 err = 0;
 599                 break;
 600
 601         case GET_VLAN_REALDEV_NAME_CMD:
 602                 err = 0;
 603                 vlan_dev_get_realdev_name(dev, args.u.device2);
 604                 if (copy_to_user(arg, &args,
 605                                  sizeof(struct vlan_ioctl_args)))
 606                         err = -EFAULT;
 607                 break;
 608
 609         case GET_VLAN_VID_CMD:
 610                 err = 0;
 611                 args.u.VID = vlan_dev_vlan_id(dev);
 612                 if (copy_to_user(arg, &args,
 613                                  sizeof(struct vlan_ioctl_args)))
 614                       err = -EFAULT;
 615                 break;
 616
 617         default:
 618                 err = -EOPNOTSUPP;
 619                 break;
 620         }
 621 out:
 622         rtnl_unlock();
 623         return err;
 624 }
 625
 626 static int __net_init vlan_init_net(struct net *net)
 627 {
 628         struct vlan_net *vn = net_generic(net, vlan_net_id);
 629         int err;
 630
 631         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 632
 633         err = vlan_proc_init(net);
 634
 635         return err;
 636 }
 637
 638 static void __net_exit vlan_exit_net(struct net *net)
 639 {
 640         vlan_proc_cleanup(net);
 641 }
 642
 643 static struct pernet_operations vlan_net_ops = {
 644         .init = vlan_init_net,
 645         .exit = vlan_exit_net,
 646         .id   = &vlan_net_id,
 647         .size = sizeof(struct vlan_net),
 648 };
 649
 650 static int __init vlan_proto_init(void)
 651 {
 652         int err;
 653
 654         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 655
 656         err = register_pernet_subsys(&vlan_net_ops);
 657         if (err < 0)
 658                 goto err0;
 659
 660         err = register_netdevice_notifier(&vlan_notifier_block);
 661         if (err < 0)
 662                 goto err2;
 663
 664         err = vlan_gvrp_init();
 665         if (err < 0)
 666                 goto err3;
 667
 668         err = vlan_mvrp_init();
 669         if (err < 0)
 670                 goto err4;
 671
 672         err = vlan_netlink_init();
 673         if (err < 0)
 674                 goto err5;
 675
 676         vlan_ioctl_set(vlan_ioctl_handler);
 677         return 0;
 678
 679 err5:
 680         vlan_mvrp_uninit();
 681 err4:
 682         vlan_gvrp_uninit();
 683 err3:
 684         unregister_netdevice_notifier(&vlan_notifier_block);
 685 err2:
 686         unregister_pernet_subsys(&vlan_net_ops);
 687 err0:
 688         return err;
 689 }
 690
 691 static void __exit vlan_cleanup_module(void)
 692 {
 693         vlan_ioctl_set(NULL);
 694         vlan_netlink_fini();
 695
 696         unregister_netdevice_notifier(&vlan_notifier_block);
 697
 698         unregister_pernet_subsys(&vlan_net_ops);
 699         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 700
 701         vlan_mvrp_uninit();
 702         vlan_gvrp_uninit();
 703 }
 704
 705 module_init(vlan_proto_init);
 706 module_exit(vlan_cleanup_module);
 707
 708 MODULE_LICENSE("GPL");
 709 MODULE_VERSION(DRV_VERSION);