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 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         grp->nr_vlans--;
 114
 115         if (vlan->flags & VLAN_FLAG_GVRP)
 116                 vlan_gvrp_request_leave(dev);
 117
 118         vlan_group_set_device(grp, vlan_id, NULL);
 119         /* Because unregister_netdevice_queue() makes sure at least one rcu
 120          * grace period is respected before device freeing,
 121          * we dont need to call synchronize_net() here.
 122          */
 123         unregister_netdevice_queue(dev, head);
 124
 125         /* If the group is now empty, kill off the group. */
 126         if (grp->nr_vlans == 0) {
 127                 vlan_gvrp_uninit_applicant(real_dev);
 128
 129                 RCU_INIT_POINTER(real_dev->vlgrp, NULL);
 130
 131                 /* Free the group, after all cpu's are done. */
 132                 call_rcu(&grp->rcu, vlan_rcu_free);
 133         }
 134
 135         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 136                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 137
 138         /* Get rid of the vlan's reference to real_dev */
 139         dev_put(real_dev);
 140 }
 141
 142 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 143 {
 144         const char *name = real_dev->name;
 145         const struct net_device_ops *ops = real_dev->netdev_ops;
 146
 147         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 148                 pr_info("VLANs not supported on %s\n", name);
 149                 return -EOPNOTSUPP;
 150         }
 151
 152         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 153             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 154                 pr_info("Device %s has buggy VLAN hw accel\n", name);
 155                 return -EOPNOTSUPP;
 156         }
 157
 158         if (vlan_find_dev(real_dev, vlan_id) != NULL)
 159                 return -EEXIST;
 160
 161         return 0;
 162 }
 163
 164 int register_vlan_dev(struct net_device *dev)
 165 {
 166         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 167         struct net_device *real_dev = vlan->real_dev;
 168         const struct net_device_ops *ops = real_dev->netdev_ops;
 169         u16 vlan_id = vlan->vlan_id;
 170         struct vlan_group *grp, *ngrp = NULL;
 171         int err;
 172
 173         grp = rtnl_dereference(real_dev->vlgrp);
 174         if (!grp) {
 175                 ngrp = grp = vlan_group_alloc(real_dev);
 176                 if (!grp)
 177                         return -ENOBUFS;
 178                 err = vlan_gvrp_init_applicant(real_dev);
 179                 if (err < 0)
 180                         goto out_free_group;
 181         }
 182
 183         err = vlan_group_prealloc_vid(grp, vlan_id);
 184         if (err < 0)
 185                 goto out_uninit_applicant;
 186
 187         err = register_netdevice(dev);
 188         if (err < 0)
 189                 goto out_uninit_applicant;
 190
 191         /* Account for reference in struct vlan_dev_info */
 192         dev_hold(real_dev);
 193
 194         netif_stacked_transfer_operstate(real_dev, dev);
 195         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 196
 197         /* So, got the sucker initialized, now lets place
 198          * it into our local structure.
 199          */
 200         vlan_group_set_device(grp, vlan_id, dev);
 201         grp->nr_vlans++;
 202
 203         if (ngrp) {
 204                 rcu_assign_pointer(real_dev->vlgrp, ngrp);
 205         }
 206         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 207                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 208
 209         return 0;
 210
 211 out_uninit_applicant:
 212         if (ngrp)
 213                 vlan_gvrp_uninit_applicant(real_dev);
 214 out_free_group:
 215         if (ngrp) {
 216                 /* Free the group, after all cpu's are done. */
 217                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 218         }
 219         return err;
 220 }
 221
 222 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 223  *  Returns 0 if the device was created or a negative error code otherwise.
 224  */
 225 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 226 {
 227         struct net_device *new_dev;
 228         struct net *net = dev_net(real_dev);
 229         struct vlan_net *vn = net_generic(net, vlan_net_id);
 230         char name[IFNAMSIZ];
 231         int err;
 232
 233         if (vlan_id >= VLAN_VID_MASK)
 234                 return -ERANGE;
 235
 236         err = vlan_check_real_dev(real_dev, vlan_id);
 237         if (err < 0)
 238                 return err;
 239
 240         /* Gotta set up the fields for the device. */
 241         switch (vn->name_type) {
 242         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 243                 /* name will look like:  eth1.0005 */
 244                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 245                 break;
 246         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 247                 /* Put our vlan.VID in the name.
 248                  * Name will look like:  vlan5
 249                  */
 250                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 251                 break;
 252         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 253                 /* Put our vlan.VID in the name.
 254                  * Name will look like:  eth0.5
 255                  */
 256                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 257                 break;
 258         case VLAN_NAME_TYPE_PLUS_VID:
 259                 /* Put our vlan.VID in the name.
 260                  * Name will look like:  vlan0005
 261                  */
 262         default:
 263                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 264         }
 265
 266         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
 267
 268         if (new_dev == NULL)
 269                 return -ENOBUFS;
 270
 271         dev_net_set(new_dev, net);
 272         /* need 4 bytes for extra VLAN header info,
 273          * hope the underlying device can handle it.
 274          */
 275         new_dev->mtu = real_dev->mtu;
 276
 277         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 278         vlan_dev_info(new_dev)->real_dev = real_dev;
 279         vlan_dev_info(new_dev)->dent = NULL;
 280         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 281
 282         new_dev->rtnl_link_ops = &vlan_link_ops;
 283         err = register_vlan_dev(new_dev);
 284         if (err < 0)
 285                 goto out_free_newdev;
 286
 287         return 0;
 288
 289 out_free_newdev:
 290         free_netdev(new_dev);
 291         return err;
 292 }
 293
 294 static void vlan_sync_address(struct net_device *dev,
 295                               struct net_device *vlandev)
 296 {
 297         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 298
 299         /* May be called without an actual change */
 300         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 301                 return;
 302
 303         /* vlan address was different from the old address and is equal to
 304          * the new address */
 305         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 306             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 307                 dev_uc_del(dev, vlandev->dev_addr);
 308
 309         /* vlan address was equal to the old address and is different from
 310          * the new address */
 311         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 312             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 313                 dev_uc_add(dev, vlandev->dev_addr);
 314
 315         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 316 }
 317
 318 static void vlan_transfer_features(struct net_device *dev,
 319                                    struct net_device *vlandev)
 320 {
 321         vlandev->gso_max_size = dev->gso_max_size;
 322
 323         if (dev->features & NETIF_F_HW_VLAN_TX)
 324                 vlandev->hard_header_len = dev->hard_header_len;
 325         else
 326                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
 327
 328 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 329         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 330 #endif
 331
 332         netdev_update_features(vlandev);
 333 }
 334
 335 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 336 {
 337         switch (event) {
 338         case NETDEV_CHANGENAME:
 339                 vlan_proc_rem_dev(dev);
 340                 if (vlan_proc_add_dev(dev) < 0)
 341                         pr_warn("failed to change proc name for %s\n",
 342                                 dev->name);
 343                 break;
 344         case NETDEV_REGISTER:
 345                 if (vlan_proc_add_dev(dev) < 0)
 346                         pr_warn("failed to add proc entry for %s\n", dev->name);
 347                 break;
 348         case NETDEV_UNREGISTER:
 349                 vlan_proc_rem_dev(dev);
 350                 break;
 351         }
 352 }
 353
 354 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 355                              void *ptr)
 356 {
 357         struct net_device *dev = ptr;
 358         struct vlan_group *grp;
 359         int i, flgs;
 360         struct net_device *vlandev;
 361         struct vlan_dev_info *vlan;
 362         LIST_HEAD(list);
 363
 364         if (is_vlan_dev(dev))
 365                 __vlan_device_event(dev, event);
 366
 367         if ((event == NETDEV_UP) &&
 368             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
 369             dev->netdev_ops->ndo_vlan_rx_add_vid) {
 370                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 371                         dev->name);
 372                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
 373         }
 374
 375         grp = rtnl_dereference(dev->vlgrp);
 376         if (!grp)
 377                 goto out;
 378
 379         /* It is OK that we do not hold the group lock right now,
 380          * as we run under the RTNL lock.
 381          */
 382
 383         switch (event) {
 384         case NETDEV_CHANGE:
 385                 /* Propagate real device state to vlan devices */
 386                 for (i = 0; i < VLAN_N_VID; i++) {
 387                         vlandev = vlan_group_get_device(grp, i);
 388                         if (!vlandev)
 389                                 continue;
 390
 391                         netif_stacked_transfer_operstate(dev, vlandev);
 392                 }
 393                 break;
 394
 395         case NETDEV_CHANGEADDR:
 396                 /* Adjust unicast filters on underlying device */
 397                 for (i = 0; i < VLAN_N_VID; i++) {
 398                         vlandev = vlan_group_get_device(grp, i);
 399                         if (!vlandev)
 400                                 continue;
 401
 402                         flgs = vlandev->flags;
 403                         if (!(flgs & IFF_UP))
 404                                 continue;
 405
 406                         vlan_sync_address(dev, vlandev);
 407                 }
 408                 break;
 409
 410         case NETDEV_CHANGEMTU:
 411                 for (i = 0; i < VLAN_N_VID; i++) {
 412                         vlandev = vlan_group_get_device(grp, i);
 413                         if (!vlandev)
 414                                 continue;
 415
 416                         if (vlandev->mtu <= dev->mtu)
 417                                 continue;
 418
 419                         dev_set_mtu(vlandev, dev->mtu);
 420                 }
 421                 break;
 422
 423         case NETDEV_FEAT_CHANGE:
 424                 /* Propagate device features to underlying device */
 425                 for (i = 0; i < VLAN_N_VID; i++) {
 426                         vlandev = vlan_group_get_device(grp, i);
 427                         if (!vlandev)
 428                                 continue;
 429
 430                         vlan_transfer_features(dev, vlandev);
 431                 }
 432
 433                 break;
 434
 435         case NETDEV_DOWN:
 436                 /* Put all VLANs for this dev in the down 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_info(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_UP:
 454                 /* Put all VLANs for this dev in the up state too.  */
 455                 for (i = 0; i < VLAN_N_VID; i++) {
 456                         vlandev = vlan_group_get_device(grp, i);
 457                         if (!vlandev)
 458                                 continue;
 459
 460                         flgs = vlandev->flags;
 461                         if (flgs & IFF_UP)
 462                                 continue;
 463
 464                         vlan = vlan_dev_info(vlandev);
 465                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 466                                 dev_change_flags(vlandev, flgs | IFF_UP);
 467                         netif_stacked_transfer_operstate(dev, vlandev);
 468                 }
 469                 break;
 470
 471         case NETDEV_UNREGISTER:
 472                 /* twiddle thumbs on netns device moves */
 473                 if (dev->reg_state != NETREG_UNREGISTERING)
 474                         break;
 475
 476                 for (i = 0; i < VLAN_N_VID; i++) {
 477                         vlandev = vlan_group_get_device(grp, i);
 478                         if (!vlandev)
 479                                 continue;
 480
 481                         /* unregistration of last vlan destroys group, abort
 482                          * afterwards */
 483                         if (grp->nr_vlans == 1)
 484                                 i = VLAN_N_VID;
 485
 486                         unregister_vlan_dev(vlandev, &list);
 487                 }
 488                 unregister_netdevice_many(&list);
 489                 break;
 490
 491         case NETDEV_PRE_TYPE_CHANGE:
 492                 /* Forbid underlaying device to change its type. */
 493                 return NOTIFY_BAD;
 494
 495         case NETDEV_NOTIFY_PEERS:
 496         case NETDEV_BONDING_FAILOVER:
 497                 /* Propagate to vlan devices */
 498                 for (i = 0; i < VLAN_N_VID; i++) {
 499                         vlandev = vlan_group_get_device(grp, i);
 500                         if (!vlandev)
 501                                 continue;
 502
 503                         call_netdevice_notifiers(event, vlandev);
 504                 }
 505                 break;
 506         }
 507
 508 out:
 509         return NOTIFY_DONE;
 510 }
 511
 512 static struct notifier_block vlan_notifier_block __read_mostly = {
 513         .notifier_call = vlan_device_event,
 514 };
 515
 516 /*
 517  *      VLAN IOCTL handler.
 518  *      o execute requested action or pass command to the device driver
 519  *   arg is really a struct vlan_ioctl_args __user *.
 520  */
 521 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 522 {
 523         int err;
 524         struct vlan_ioctl_args args;
 525         struct net_device *dev = NULL;
 526
 527         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 528                 return -EFAULT;
 529
 530         /* Null terminate this sucker, just in case. */
 531         args.device1[23] = 0;
 532         args.u.device2[23] = 0;
 533
 534         rtnl_lock();
 535
 536         switch (args.cmd) {
 537         case SET_VLAN_INGRESS_PRIORITY_CMD:
 538         case SET_VLAN_EGRESS_PRIORITY_CMD:
 539         case SET_VLAN_FLAG_CMD:
 540         case ADD_VLAN_CMD:
 541         case DEL_VLAN_CMD:
 542         case GET_VLAN_REALDEV_NAME_CMD:
 543         case GET_VLAN_VID_CMD:
 544                 err = -ENODEV;
 545                 dev = __dev_get_by_name(net, args.device1);
 546                 if (!dev)
 547                         goto out;
 548
 549                 err = -EINVAL;
 550                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 551                         goto out;
 552         }
 553
 554         switch (args.cmd) {
 555         case SET_VLAN_INGRESS_PRIORITY_CMD:
 556                 err = -EPERM;
 557                 if (!capable(CAP_NET_ADMIN))
 558                         break;
 559                 vlan_dev_set_ingress_priority(dev,
 560                                               args.u.skb_priority,
 561                                               args.vlan_qos);
 562                 err = 0;
 563                 break;
 564
 565         case SET_VLAN_EGRESS_PRIORITY_CMD:
 566                 err = -EPERM;
 567                 if (!capable(CAP_NET_ADMIN))
 568                         break;
 569                 err = vlan_dev_set_egress_priority(dev,
 570                                                    args.u.skb_priority,
 571                                                    args.vlan_qos);
 572                 break;
 573
 574         case SET_VLAN_FLAG_CMD:
 575                 err = -EPERM;
 576                 if (!capable(CAP_NET_ADMIN))
 577                         break;
 578                 err = vlan_dev_change_flags(dev,
 579                                             args.vlan_qos ? args.u.flag : 0,
 580                                             args.u.flag);
 581                 break;
 582
 583         case SET_VLAN_NAME_TYPE_CMD:
 584                 err = -EPERM;
 585                 if (!capable(CAP_NET_ADMIN))
 586                         break;
 587                 if ((args.u.name_type >= 0) &&
 588                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 589                         struct vlan_net *vn;
 590
 591                         vn = net_generic(net, vlan_net_id);
 592                         vn->name_type = args.u.name_type;
 593                         err = 0;
 594                 } else {
 595                         err = -EINVAL;
 596                 }
 597                 break;
 598
 599         case ADD_VLAN_CMD:
 600                 err = -EPERM;
 601                 if (!capable(CAP_NET_ADMIN))
 602                         break;
 603                 err = register_vlan_device(dev, args.u.VID);
 604                 break;
 605
 606         case DEL_VLAN_CMD:
 607                 err = -EPERM;
 608                 if (!capable(CAP_NET_ADMIN))
 609                         break;
 610                 unregister_vlan_dev(dev, NULL);
 611                 err = 0;
 612                 break;
 613
 614         case GET_VLAN_REALDEV_NAME_CMD:
 615                 err = 0;
 616                 vlan_dev_get_realdev_name(dev, args.u.device2);
 617                 if (copy_to_user(arg, &args,
 618                                  sizeof(struct vlan_ioctl_args)))
 619                         err = -EFAULT;
 620                 break;
 621
 622         case GET_VLAN_VID_CMD:
 623                 err = 0;
 624                 args.u.VID = vlan_dev_vlan_id(dev);
 625                 if (copy_to_user(arg, &args,
 626                                  sizeof(struct vlan_ioctl_args)))
 627                       err = -EFAULT;
 628                 break;
 629
 630         default:
 631                 err = -EOPNOTSUPP;
 632                 break;
 633         }
 634 out:
 635         rtnl_unlock();
 636         return err;
 637 }
 638
 639 static int __net_init vlan_init_net(struct net *net)
 640 {
 641         struct vlan_net *vn = net_generic(net, vlan_net_id);
 642         int err;
 643
 644         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 645
 646         err = vlan_proc_init(net);
 647
 648         return err;
 649 }
 650
 651 static void __net_exit vlan_exit_net(struct net *net)
 652 {
 653         vlan_proc_cleanup(net);
 654 }
 655
 656 static struct pernet_operations vlan_net_ops = {
 657         .init = vlan_init_net,
 658         .exit = vlan_exit_net,
 659         .id   = &vlan_net_id,
 660         .size = sizeof(struct vlan_net),
 661 };
 662
 663 static int __init vlan_proto_init(void)
 664 {
 665         int err;
 666
 667         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 668
 669         err = register_pernet_subsys(&vlan_net_ops);
 670         if (err < 0)
 671                 goto err0;
 672
 673         err = register_netdevice_notifier(&vlan_notifier_block);
 674         if (err < 0)
 675                 goto err2;
 676
 677         err = vlan_gvrp_init();
 678         if (err < 0)
 679                 goto err3;
 680
 681         err = vlan_netlink_init();
 682         if (err < 0)
 683                 goto err4;
 684
 685         vlan_ioctl_set(vlan_ioctl_handler);
 686         return 0;
 687
 688 err4:
 689         vlan_gvrp_uninit();
 690 err3:
 691         unregister_netdevice_notifier(&vlan_notifier_block);
 692 err2:
 693         unregister_pernet_subsys(&vlan_net_ops);
 694 err0:
 695         return err;
 696 }
 697
 698 static void __exit vlan_cleanup_module(void)
 699 {
 700         vlan_ioctl_set(NULL);
 701         vlan_netlink_fini();
 702
 703         unregister_netdevice_notifier(&vlan_notifier_block);
 704
 705         unregister_pernet_subsys(&vlan_net_ops);
 706         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 707
 708         vlan_gvrp_uninit();
 709 }
 710
 711 module_init(vlan_proto_init);
 712 module_exit(vlan_cleanup_module);
 713
 714 MODULE_LICENSE("GPL");
 715 MODULE_VERSION(DRV_VERSION);