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 #include <linux/capability.h>
  22 #include <linux/module.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/rculist.h>
  28 #include <net/p8022.h>
  29 #include <net/arp.h>
  30 #include <linux/rtnetlink.h>
  31 #include <linux/notifier.h>
  32 #include <net/rtnetlink.h>
  33 #include <net/net_namespace.h>
  34 #include <net/netns/generic.h>
  35 #include <asm/uaccess.h>
  36
  37 #include <linux/if_vlan.h>
  38 #include "vlan.h"
  39 #include "vlanproc.h"
  40
  41 #define DRV_VERSION "1.8"
  42
  43 /* Global VLAN variables */
  44
  45 int vlan_net_id __read_mostly;
  46
  47 const char vlan_fullname[] = "802.1Q VLAN Support";
  48 const char vlan_version[] = DRV_VERSION;
  49 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  50 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  51
  52 /* End of global variables definitions. */
  53
  54 static void vlan_group_free(struct vlan_group *grp)
  55 {
  56         int i;
  57
  58         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
  59                 kfree(grp->vlan_devices_arrays[i]);
  60         kfree(grp);
  61 }
  62
  63 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
  64 {
  65         struct vlan_group *grp;
  66
  67         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
  68         if (!grp)
  69                 return NULL;
  70
  71         grp->real_dev = real_dev;
  72         return grp;
  73 }
  74
  75 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
  76 {
  77         struct net_device **array;
  78         unsigned int size;
  79
  80         ASSERT_RTNL();
  81
  82         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
  83         if (array != NULL)
  84                 return 0;
  85
  86         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
  87         array = kzalloc(size, GFP_KERNEL);
  88         if (array == NULL)
  89                 return -ENOBUFS;
  90
  91         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
  92         return 0;
  93 }
  94
  95 static void vlan_rcu_free(struct rcu_head *rcu)
  96 {
  97         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
  98 }
  99
 100 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 101 {
 102         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 103         struct net_device *real_dev = vlan->real_dev;
 104         const struct net_device_ops *ops = real_dev->netdev_ops;
 105         struct vlan_group *grp;
 106         u16 vlan_id = vlan->vlan_id;
 107
 108         ASSERT_RTNL();
 109
 110         grp = rtnl_dereference(real_dev->vlgrp);
 111         BUG_ON(!grp);
 112
 113         /* Take it out of our own structures, but be sure to interlock with
 114          * HW accelerating devices or SW vlan input packet processing if
 115          * VLAN is not 0 (leave it there for 802.1p).
 116          */
 117         if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
 118                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 119
 120         grp->nr_vlans--;
 121
 122         vlan_group_set_device(grp, vlan_id, NULL);
 123         if (!grp->killall)
 124                 synchronize_net();
 125
 126         unregister_netdevice_queue(dev, head);
 127
 128         /* If the group is now empty, kill off the group. */
 129         if (grp->nr_vlans == 0) {
 130                 vlan_gvrp_uninit_applicant(real_dev);
 131
 132                 rcu_assign_pointer(real_dev->vlgrp, NULL);
 133                 if (ops->ndo_vlan_rx_register)
 134                         ops->ndo_vlan_rx_register(real_dev, NULL);
 135
 136                 /* Free the group, after all cpu's are done. */
 137                 call_rcu(&grp->rcu, vlan_rcu_free);
 138         }
 139
 140         /* Get rid of the vlan's reference to real_dev */
 141         dev_put(real_dev);
 142 }
 143
 144 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 145 {
 146         const char *name = real_dev->name;
 147         const struct net_device_ops *ops = real_dev->netdev_ops;
 148
 149         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 150                 pr_info("8021q: VLANs not supported on %s\n", name);
 151                 return -EOPNOTSUPP;
 152         }
 153
 154         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 155             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 156                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 157                 return -EOPNOTSUPP;
 158         }
 159
 160         if (vlan_find_dev(real_dev, vlan_id) != NULL)
 161                 return -EEXIST;
 162
 163         return 0;
 164 }
 165
 166 int register_vlan_dev(struct net_device *dev)
 167 {
 168         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 169         struct net_device *real_dev = vlan->real_dev;
 170         const struct net_device_ops *ops = real_dev->netdev_ops;
 171         u16 vlan_id = vlan->vlan_id;
 172         struct vlan_group *grp, *ngrp = NULL;
 173         int err;
 174
 175         grp = rtnl_dereference(real_dev->vlgrp);
 176         if (!grp) {
 177                 ngrp = grp = vlan_group_alloc(real_dev);
 178                 if (!grp)
 179                         return -ENOBUFS;
 180                 err = vlan_gvrp_init_applicant(real_dev);
 181                 if (err < 0)
 182                         goto out_free_group;
 183         }
 184
 185         err = vlan_group_prealloc_vid(grp, vlan_id);
 186         if (err < 0)
 187                 goto out_uninit_applicant;
 188
 189         err = register_netdevice(dev);
 190         if (err < 0)
 191                 goto out_uninit_applicant;
 192
 193         /* Account for reference in struct vlan_dev_info */
 194         dev_hold(real_dev);
 195
 196         netif_stacked_transfer_operstate(real_dev, dev);
 197         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 198
 199         /* So, got the sucker initialized, now lets place
 200          * it into our local structure.
 201          */
 202         vlan_group_set_device(grp, vlan_id, dev);
 203         grp->nr_vlans++;
 204
 205         if (ngrp) {
 206                 if (ops->ndo_vlan_rx_register)
 207                         ops->ndo_vlan_rx_register(real_dev, ngrp);
 208                 rcu_assign_pointer(real_dev->vlgrp, ngrp);
 209         }
 210         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 211                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 212
 213         return 0;
 214
 215 out_uninit_applicant:
 216         if (ngrp)
 217                 vlan_gvrp_uninit_applicant(real_dev);
 218 out_free_group:
 219         if (ngrp) {
 220                 /* Free the group, after all cpu's are done. */
 221                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 222         }
 223         return err;
 224 }
 225
 226 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 227  *  Returns 0 if the device was created or a negative error code otherwise.
 228  */
 229 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 230 {
 231         struct net_device *new_dev;
 232         struct net *net = dev_net(real_dev);
 233         struct vlan_net *vn = net_generic(net, vlan_net_id);
 234         char name[IFNAMSIZ];
 235         int err;
 236
 237         if (vlan_id >= VLAN_VID_MASK)
 238                 return -ERANGE;
 239
 240         err = vlan_check_real_dev(real_dev, vlan_id);
 241         if (err < 0)
 242                 return err;
 243
 244         /* Gotta set up the fields for the device. */
 245         switch (vn->name_type) {
 246         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 247                 /* name will look like:  eth1.0005 */
 248                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 249                 break;
 250         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 251                 /* Put our vlan.VID in the name.
 252                  * Name will look like:  vlan5
 253                  */
 254                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 255                 break;
 256         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 257                 /* Put our vlan.VID in the name.
 258                  * Name will look like:  eth0.5
 259                  */
 260                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 261                 break;
 262         case VLAN_NAME_TYPE_PLUS_VID:
 263                 /* Put our vlan.VID in the name.
 264                  * Name will look like:  vlan0005
 265                  */
 266         default:
 267                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 268         }
 269
 270         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
 271
 272         if (new_dev == NULL)
 273                 return -ENOBUFS;
 274
 275         dev_net_set(new_dev, net);
 276         /* need 4 bytes for extra VLAN header info,
 277          * hope the underlying device can handle it.
 278          */
 279         new_dev->mtu = real_dev->mtu;
 280
 281         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 282         vlan_dev_info(new_dev)->real_dev = real_dev;
 283         vlan_dev_info(new_dev)->dent = NULL;
 284         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 285
 286         new_dev->rtnl_link_ops = &vlan_link_ops;
 287         err = register_vlan_dev(new_dev);
 288         if (err < 0)
 289                 goto out_free_newdev;
 290
 291         return 0;
 292
 293 out_free_newdev:
 294         free_netdev(new_dev);
 295         return err;
 296 }
 297
 298 static void vlan_sync_address(struct net_device *dev,
 299                               struct net_device *vlandev)
 300 {
 301         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 302
 303         /* May be called without an actual change */
 304         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 305                 return;
 306
 307         /* vlan address was different from the old address and is equal to
 308          * the new address */
 309         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 310             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 311                 dev_uc_del(dev, vlandev->dev_addr);
 312
 313         /* vlan address was equal to the old address and is different from
 314          * the new address */
 315         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 316             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 317                 dev_uc_add(dev, vlandev->dev_addr);
 318
 319         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 320 }
 321
 322 static void vlan_transfer_features(struct net_device *dev,
 323                                    struct net_device *vlandev)
 324 {
 325         vlandev->gso_max_size = dev->gso_max_size;
 326
 327         if (dev->features & NETIF_F_HW_VLAN_TX)
 328                 vlandev->hard_header_len = dev->hard_header_len;
 329         else
 330                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 331
 332 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 333         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 334 #endif
 335
 336         netdev_update_features(vlandev);
 337 }
 338
 339 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 340 {
 341         switch (event) {
 342         case NETDEV_CHANGENAME:
 343                 vlan_proc_rem_dev(dev);
 344                 if (vlan_proc_add_dev(dev) < 0)
 345                         pr_warning("8021q: failed to change proc name for %s\n",
 346                                         dev->name);
 347                 break;
 348         case NETDEV_REGISTER:
 349                 if (vlan_proc_add_dev(dev) < 0)
 350                         pr_warning("8021q: failed to add proc entry for %s\n",
 351                                         dev->name);
 352                 break;
 353         case NETDEV_UNREGISTER:
 354                 vlan_proc_rem_dev(dev);
 355                 break;
 356         }
 357 }
 358
 359 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 360                              void *ptr)
 361 {
 362         struct net_device *dev = ptr;
 363         struct vlan_group *grp;
 364         int i, flgs;
 365         struct net_device *vlandev;
 366         struct vlan_dev_info *vlan;
 367         LIST_HEAD(list);
 368
 369         if (is_vlan_dev(dev))
 370                 __vlan_device_event(dev, event);
 371
 372         if ((event == NETDEV_UP) &&
 373             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
 374             dev->netdev_ops->ndo_vlan_rx_add_vid) {
 375                 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
 376                         dev->name);
 377                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
 378         }
 379
 380         grp = rtnl_dereference(dev->vlgrp);
 381         if (!grp)
 382                 goto out;
 383
 384         /* It is OK that we do not hold the group lock right now,
 385          * as we run under the RTNL lock.
 386          */
 387
 388         switch (event) {
 389         case NETDEV_CHANGE:
 390                 /* Propagate real device state to vlan devices */
 391                 for (i = 0; i < VLAN_N_VID; i++) {
 392                         vlandev = vlan_group_get_device(grp, i);
 393                         if (!vlandev)
 394                                 continue;
 395
 396                         netif_stacked_transfer_operstate(dev, vlandev);
 397                 }
 398                 break;
 399
 400         case NETDEV_CHANGEADDR:
 401                 /* Adjust unicast filters on underlying device */
 402                 for (i = 0; i < VLAN_N_VID; i++) {
 403                         vlandev = vlan_group_get_device(grp, i);
 404                         if (!vlandev)
 405                                 continue;
 406
 407                         flgs = vlandev->flags;
 408                         if (!(flgs & IFF_UP))
 409                                 continue;
 410
 411                         vlan_sync_address(dev, vlandev);
 412                 }
 413                 break;
 414
 415         case NETDEV_CHANGEMTU:
 416                 for (i = 0; i < VLAN_N_VID; i++) {
 417                         vlandev = vlan_group_get_device(grp, i);
 418                         if (!vlandev)
 419                                 continue;
 420
 421                         if (vlandev->mtu <= dev->mtu)
 422                                 continue;
 423
 424                         dev_set_mtu(vlandev, dev->mtu);
 425                 }
 426                 break;
 427
 428         case NETDEV_FEAT_CHANGE:
 429                 /* Propagate device features to underlying device */
 430                 for (i = 0; i < VLAN_N_VID; i++) {
 431                         vlandev = vlan_group_get_device(grp, i);
 432                         if (!vlandev)
 433                                 continue;
 434
 435                         vlan_transfer_features(dev, vlandev);
 436                 }
 437
 438                 break;
 439
 440         case NETDEV_DOWN:
 441                 /* Put all VLANs for this dev in the down state too.  */
 442                 for (i = 0; i < VLAN_N_VID; i++) {
 443                         vlandev = vlan_group_get_device(grp, i);
 444                         if (!vlandev)
 445                                 continue;
 446
 447                         flgs = vlandev->flags;
 448                         if (!(flgs & IFF_UP))
 449                                 continue;
 450
 451                         vlan = vlan_dev_info(vlandev);
 452                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 453                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 454                         netif_stacked_transfer_operstate(dev, vlandev);
 455                 }
 456                 break;
 457
 458         case NETDEV_UP:
 459                 /* Put all VLANs for this dev in the up state too.  */
 460                 for (i = 0; i < VLAN_N_VID; i++) {
 461                         vlandev = vlan_group_get_device(grp, i);
 462                         if (!vlandev)
 463                                 continue;
 464
 465                         flgs = vlandev->flags;
 466                         if (flgs & IFF_UP)
 467                                 continue;
 468
 469                         vlan = vlan_dev_info(vlandev);
 470                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 471                                 dev_change_flags(vlandev, flgs | IFF_UP);
 472                         netif_stacked_transfer_operstate(dev, vlandev);
 473                 }
 474                 break;
 475
 476         case NETDEV_UNREGISTER:
 477                 /* twiddle thumbs on netns device moves */
 478                 if (dev->reg_state != NETREG_UNREGISTERING)
 479                         break;
 480
 481                 /* Delete all VLANs for this dev. */
 482                 grp->killall = 1;
 483
 484                 for (i = 0; i < VLAN_N_VID; i++) {
 485                         vlandev = vlan_group_get_device(grp, i);
 486                         if (!vlandev)
 487                                 continue;
 488
 489                         /* unregistration of last vlan destroys group, abort
 490                          * afterwards */
 491                         if (grp->nr_vlans == 1)
 492                                 i = VLAN_N_VID;
 493
 494                         unregister_vlan_dev(vlandev, &list);
 495                 }
 496                 unregister_netdevice_many(&list);
 497                 break;
 498
 499         case NETDEV_PRE_TYPE_CHANGE:
 500                 /* Forbid underlaying device to change its type. */
 501                 return NOTIFY_BAD;
 502         }
 503
 504 out:
 505         return NOTIFY_DONE;
 506 }
 507
 508 static struct notifier_block vlan_notifier_block __read_mostly = {
 509         .notifier_call = vlan_device_event,
 510 };
 511
 512 /*
 513  *      VLAN IOCTL handler.
 514  *      o execute requested action or pass command to the device driver
 515  *   arg is really a struct vlan_ioctl_args __user *.
 516  */
 517 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 518 {
 519         int err;
 520         struct vlan_ioctl_args args;
 521         struct net_device *dev = NULL;
 522
 523         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 524                 return -EFAULT;
 525
 526         /* Null terminate this sucker, just in case. */
 527         args.device1[23] = 0;
 528         args.u.device2[23] = 0;
 529
 530         rtnl_lock();
 531
 532         switch (args.cmd) {
 533         case SET_VLAN_INGRESS_PRIORITY_CMD:
 534         case SET_VLAN_EGRESS_PRIORITY_CMD:
 535         case SET_VLAN_FLAG_CMD:
 536         case ADD_VLAN_CMD:
 537         case DEL_VLAN_CMD:
 538         case GET_VLAN_REALDEV_NAME_CMD:
 539         case GET_VLAN_VID_CMD:
 540                 err = -ENODEV;
 541                 dev = __dev_get_by_name(net, args.device1);
 542                 if (!dev)
 543                         goto out;
 544
 545                 err = -EINVAL;
 546                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 547                         goto out;
 548         }
 549
 550         switch (args.cmd) {
 551         case SET_VLAN_INGRESS_PRIORITY_CMD:
 552                 err = -EPERM;
 553                 if (!capable(CAP_NET_ADMIN))
 554                         break;
 555                 vlan_dev_set_ingress_priority(dev,
 556                                               args.u.skb_priority,
 557                                               args.vlan_qos);
 558                 err = 0;
 559                 break;
 560
 561         case SET_VLAN_EGRESS_PRIORITY_CMD:
 562                 err = -EPERM;
 563                 if (!capable(CAP_NET_ADMIN))
 564                         break;
 565                 err = vlan_dev_set_egress_priority(dev,
 566                                                    args.u.skb_priority,
 567                                                    args.vlan_qos);
 568                 break;
 569
 570         case SET_VLAN_FLAG_CMD:
 571                 err = -EPERM;
 572                 if (!capable(CAP_NET_ADMIN))
 573                         break;
 574                 err = vlan_dev_change_flags(dev,
 575                                             args.vlan_qos ? args.u.flag : 0,
 576                                             args.u.flag);
 577                 break;
 578
 579         case SET_VLAN_NAME_TYPE_CMD:
 580                 err = -EPERM;
 581                 if (!capable(CAP_NET_ADMIN))
 582                         break;
 583                 if ((args.u.name_type >= 0) &&
 584                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 585                         struct vlan_net *vn;
 586
 587                         vn = net_generic(net, vlan_net_id);
 588                         vn->name_type = args.u.name_type;
 589                         err = 0;
 590                 } else {
 591                         err = -EINVAL;
 592                 }
 593                 break;
 594
 595         case ADD_VLAN_CMD:
 596                 err = -EPERM;
 597                 if (!capable(CAP_NET_ADMIN))
 598                         break;
 599                 err = register_vlan_device(dev, args.u.VID);
 600                 break;
 601
 602         case DEL_VLAN_CMD:
 603                 err = -EPERM;
 604                 if (!capable(CAP_NET_ADMIN))
 605                         break;
 606                 unregister_vlan_dev(dev, NULL);
 607                 err = 0;
 608                 break;
 609
 610         case GET_VLAN_REALDEV_NAME_CMD:
 611                 err = 0;
 612                 vlan_dev_get_realdev_name(dev, args.u.device2);
 613                 if (copy_to_user(arg, &args,
 614                                  sizeof(struct vlan_ioctl_args)))
 615                         err = -EFAULT;
 616                 break;
 617
 618         case GET_VLAN_VID_CMD:
 619                 err = 0;
 620                 args.u.VID = vlan_dev_vlan_id(dev);
 621                 if (copy_to_user(arg, &args,
 622                                  sizeof(struct vlan_ioctl_args)))
 623                       err = -EFAULT;
 624                 break;
 625
 626         default:
 627                 err = -EOPNOTSUPP;
 628                 break;
 629         }
 630 out:
 631         rtnl_unlock();
 632         return err;
 633 }
 634
 635 static int __net_init vlan_init_net(struct net *net)
 636 {
 637         struct vlan_net *vn = net_generic(net, vlan_net_id);
 638         int err;
 639
 640         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 641
 642         err = vlan_proc_init(net);
 643
 644         return err;
 645 }
 646
 647 static void __net_exit vlan_exit_net(struct net *net)
 648 {
 649         vlan_proc_cleanup(net);
 650 }
 651
 652 static struct pernet_operations vlan_net_ops = {
 653         .init = vlan_init_net,
 654         .exit = vlan_exit_net,
 655         .id   = &vlan_net_id,
 656         .size = sizeof(struct vlan_net),
 657 };
 658
 659 static int __init vlan_proto_init(void)
 660 {
 661         int err;
 662
 663         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 664         pr_info("All bugs added by %s\n", vlan_buggyright);
 665
 666         err = register_pernet_subsys(&vlan_net_ops);
 667         if (err < 0)
 668                 goto err0;
 669
 670         err = register_netdevice_notifier(&vlan_notifier_block);
 671         if (err < 0)
 672                 goto err2;
 673
 674         err = vlan_gvrp_init();
 675         if (err < 0)
 676                 goto err3;
 677
 678         err = vlan_netlink_init();
 679         if (err < 0)
 680                 goto err4;
 681
 682         vlan_ioctl_set(vlan_ioctl_handler);
 683         return 0;
 684
 685 err4:
 686         vlan_gvrp_uninit();
 687 err3:
 688         unregister_netdevice_notifier(&vlan_notifier_block);
 689 err2:
 690         unregister_pernet_subsys(&vlan_net_ops);
 691 err0:
 692         return err;
 693 }
 694
 695 static void __exit vlan_cleanup_module(void)
 696 {
 697         vlan_ioctl_set(NULL);
 698         vlan_netlink_fini();
 699
 700         unregister_netdevice_notifier(&vlan_notifier_block);
 701
 702         unregister_pernet_subsys(&vlan_net_ops);
 703         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 704
 705         vlan_gvrp_uninit();
 706 }
 707
 708 module_init(vlan_proto_init);
 709 module_exit(vlan_cleanup_module);
 710
 711 MODULE_LICENSE("GPL");
 712 MODULE_VERSION(DRV_VERSION);