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         /* 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         if (vlan->flags & VLAN_FLAG_GVRP)
 123                 vlan_gvrp_request_leave(dev);
 124
 125         vlan_group_set_device(grp, vlan_id, NULL);
 126         /* Because unregister_netdevice_queue() makes sure at least one rcu
 127          * grace period is respected before device freeing,
 128          * we dont need to call synchronize_net() here.
 129          */
 130         unregister_netdevice_queue(dev, head);
 131
 132         /* If the group is now empty, kill off the group. */
 133         if (grp->nr_vlans == 0) {
 134                 vlan_gvrp_uninit_applicant(real_dev);
 135
 136                 RCU_INIT_POINTER(real_dev->vlgrp, NULL);
 137
 138                 /* Free the group, after all cpu's are done. */
 139                 call_rcu(&grp->rcu, vlan_rcu_free);
 140         }
 141
 142         /* Get rid of the vlan's reference to real_dev */
 143         dev_put(real_dev);
 144 }
 145
 146 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 147 {
 148         const char *name = real_dev->name;
 149         const struct net_device_ops *ops = real_dev->netdev_ops;
 150
 151         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 152                 pr_info("VLANs not supported on %s\n", name);
 153                 return -EOPNOTSUPP;
 154         }
 155
 156         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 157             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 158                 pr_info("Device %s has buggy VLAN hw accel\n", name);
 159                 return -EOPNOTSUPP;
 160         }
 161
 162         if (vlan_find_dev(real_dev, vlan_id) != NULL)
 163                 return -EEXIST;
 164
 165         return 0;
 166 }
 167
 168 int register_vlan_dev(struct net_device *dev)
 169 {
 170         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 171         struct net_device *real_dev = vlan->real_dev;
 172         const struct net_device_ops *ops = real_dev->netdev_ops;
 173         u16 vlan_id = vlan->vlan_id;
 174         struct vlan_group *grp, *ngrp = NULL;
 175         int err;
 176
 177         grp = rtnl_dereference(real_dev->vlgrp);
 178         if (!grp) {
 179                 ngrp = grp = vlan_group_alloc(real_dev);
 180                 if (!grp)
 181                         return -ENOBUFS;
 182                 err = vlan_gvrp_init_applicant(real_dev);
 183                 if (err < 0)
 184                         goto out_free_group;
 185         }
 186
 187         err = vlan_group_prealloc_vid(grp, vlan_id);
 188         if (err < 0)
 189                 goto out_uninit_applicant;
 190
 191         err = register_netdevice(dev);
 192         if (err < 0)
 193                 goto out_uninit_applicant;
 194
 195         /* Account for reference in struct vlan_dev_info */
 196         dev_hold(real_dev);
 197
 198         netif_stacked_transfer_operstate(real_dev, dev);
 199         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 200
 201         /* So, got the sucker initialized, now lets place
 202          * it into our local structure.
 203          */
 204         vlan_group_set_device(grp, vlan_id, dev);
 205         grp->nr_vlans++;
 206
 207         if (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_warn("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_warn("failed to add proc entry for %s\n", dev->name);
 351                 break;
 352         case NETDEV_UNREGISTER:
 353                 vlan_proc_rem_dev(dev);
 354                 break;
 355         }
 356 }
 357
 358 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 359                              void *ptr)
 360 {
 361         struct net_device *dev = ptr;
 362         struct vlan_group *grp;
 363         int i, flgs;
 364         struct net_device *vlandev;
 365         struct vlan_dev_info *vlan;
 366         LIST_HEAD(list);
 367
 368         if (is_vlan_dev(dev))
 369                 __vlan_device_event(dev, event);
 370
 371         if ((event == NETDEV_UP) &&
 372             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
 373             dev->netdev_ops->ndo_vlan_rx_add_vid) {
 374                 pr_info("adding VLAN 0 to HW filter on device %s\n",
 375                         dev->name);
 376                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
 377         }
 378
 379         grp = rtnl_dereference(dev->vlgrp);
 380         if (!grp)
 381                 goto out;
 382
 383         /* It is OK that we do not hold the group lock right now,
 384          * as we run under the RTNL lock.
 385          */
 386
 387         switch (event) {
 388         case NETDEV_CHANGE:
 389                 /* Propagate real device state to vlan devices */
 390                 for (i = 0; i < VLAN_N_VID; i++) {
 391                         vlandev = vlan_group_get_device(grp, i);
 392                         if (!vlandev)
 393                                 continue;
 394
 395                         netif_stacked_transfer_operstate(dev, vlandev);
 396                 }
 397                 break;
 398
 399         case NETDEV_CHANGEADDR:
 400                 /* Adjust unicast filters on underlying device */
 401                 for (i = 0; i < VLAN_N_VID; i++) {
 402                         vlandev = vlan_group_get_device(grp, i);
 403                         if (!vlandev)
 404                                 continue;
 405
 406                         flgs = vlandev->flags;
 407                         if (!(flgs & IFF_UP))
 408                                 continue;
 409
 410                         vlan_sync_address(dev, vlandev);
 411                 }
 412                 break;
 413
 414         case NETDEV_CHANGEMTU:
 415                 for (i = 0; i < VLAN_N_VID; i++) {
 416                         vlandev = vlan_group_get_device(grp, i);
 417                         if (!vlandev)
 418                                 continue;
 419
 420                         if (vlandev->mtu <= dev->mtu)
 421                                 continue;
 422
 423                         dev_set_mtu(vlandev, dev->mtu);
 424                 }
 425                 break;
 426
 427         case NETDEV_FEAT_CHANGE:
 428                 /* Propagate device features to underlying device */
 429                 for (i = 0; i < VLAN_N_VID; i++) {
 430                         vlandev = vlan_group_get_device(grp, i);
 431                         if (!vlandev)
 432                                 continue;
 433
 434                         vlan_transfer_features(dev, vlandev);
 435                 }
 436
 437                 break;
 438
 439         case NETDEV_DOWN:
 440                 /* Put all VLANs for this dev in the down state too.  */
 441                 for (i = 0; i < VLAN_N_VID; i++) {
 442                         vlandev = vlan_group_get_device(grp, i);
 443                         if (!vlandev)
 444                                 continue;
 445
 446                         flgs = vlandev->flags;
 447                         if (!(flgs & IFF_UP))
 448                                 continue;
 449
 450                         vlan = vlan_dev_info(vlandev);
 451                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 452                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 453                         netif_stacked_transfer_operstate(dev, vlandev);
 454                 }
 455                 break;
 456
 457         case NETDEV_UP:
 458                 /* Put all VLANs for this dev in the up state too.  */
 459                 for (i = 0; i < VLAN_N_VID; i++) {
 460                         vlandev = vlan_group_get_device(grp, i);
 461                         if (!vlandev)
 462                                 continue;
 463
 464                         flgs = vlandev->flags;
 465                         if (flgs & IFF_UP)
 466                                 continue;
 467
 468                         vlan = vlan_dev_info(vlandev);
 469                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 470                                 dev_change_flags(vlandev, flgs | IFF_UP);
 471                         netif_stacked_transfer_operstate(dev, vlandev);
 472                 }
 473                 break;
 474
 475         case NETDEV_UNREGISTER:
 476                 /* twiddle thumbs on netns device moves */
 477                 if (dev->reg_state != NETREG_UNREGISTERING)
 478                         break;
 479
 480                 for (i = 0; i < VLAN_N_VID; i++) {
 481                         vlandev = vlan_group_get_device(grp, i);
 482                         if (!vlandev)
 483                                 continue;
 484
 485                         /* unregistration of last vlan destroys group, abort
 486                          * afterwards */
 487                         if (grp->nr_vlans == 1)
 488                                 i = VLAN_N_VID;
 489
 490                         unregister_vlan_dev(vlandev, &list);
 491                 }
 492                 unregister_netdevice_many(&list);
 493                 break;
 494
 495         case NETDEV_PRE_TYPE_CHANGE:
 496                 /* Forbid underlaying device to change its type. */
 497                 return NOTIFY_BAD;
 498
 499         case NETDEV_NOTIFY_PEERS:
 500         case NETDEV_BONDING_FAILOVER:
 501                 /* Propagate to vlan devices */
 502                 for (i = 0; i < VLAN_N_VID; i++) {
 503                         vlandev = vlan_group_get_device(grp, i);
 504                         if (!vlandev)
 505                                 continue;
 506
 507                         call_netdevice_notifiers(event, vlandev);
 508                 }
 509                 break;
 510         }
 511
 512 out:
 513         return NOTIFY_DONE;
 514 }
 515
 516 static struct notifier_block vlan_notifier_block __read_mostly = {
 517         .notifier_call = vlan_device_event,
 518 };
 519
 520 /*
 521  *      VLAN IOCTL handler.
 522  *      o execute requested action or pass command to the device driver
 523  *   arg is really a struct vlan_ioctl_args __user *.
 524  */
 525 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 526 {
 527         int err;
 528         struct vlan_ioctl_args args;
 529         struct net_device *dev = NULL;
 530
 531         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 532                 return -EFAULT;
 533
 534         /* Null terminate this sucker, just in case. */
 535         args.device1[23] = 0;
 536         args.u.device2[23] = 0;
 537
 538         rtnl_lock();
 539
 540         switch (args.cmd) {
 541         case SET_VLAN_INGRESS_PRIORITY_CMD:
 542         case SET_VLAN_EGRESS_PRIORITY_CMD:
 543         case SET_VLAN_FLAG_CMD:
 544         case ADD_VLAN_CMD:
 545         case DEL_VLAN_CMD:
 546         case GET_VLAN_REALDEV_NAME_CMD:
 547         case GET_VLAN_VID_CMD:
 548                 err = -ENODEV;
 549                 dev = __dev_get_by_name(net, args.device1);
 550                 if (!dev)
 551                         goto out;
 552
 553                 err = -EINVAL;
 554                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 555                         goto out;
 556         }
 557
 558         switch (args.cmd) {
 559         case SET_VLAN_INGRESS_PRIORITY_CMD:
 560                 err = -EPERM;
 561                 if (!capable(CAP_NET_ADMIN))
 562                         break;
 563                 vlan_dev_set_ingress_priority(dev,
 564                                               args.u.skb_priority,
 565                                               args.vlan_qos);
 566                 err = 0;
 567                 break;
 568
 569         case SET_VLAN_EGRESS_PRIORITY_CMD:
 570                 err = -EPERM;
 571                 if (!capable(CAP_NET_ADMIN))
 572                         break;
 573                 err = vlan_dev_set_egress_priority(dev,
 574                                                    args.u.skb_priority,
 575                                                    args.vlan_qos);
 576                 break;
 577
 578         case SET_VLAN_FLAG_CMD:
 579                 err = -EPERM;
 580                 if (!capable(CAP_NET_ADMIN))
 581                         break;
 582                 err = vlan_dev_change_flags(dev,
 583                                             args.vlan_qos ? args.u.flag : 0,
 584                                             args.u.flag);
 585                 break;
 586
 587         case SET_VLAN_NAME_TYPE_CMD:
 588                 err = -EPERM;
 589                 if (!capable(CAP_NET_ADMIN))
 590                         break;
 591                 if ((args.u.name_type >= 0) &&
 592                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 593                         struct vlan_net *vn;
 594
 595                         vn = net_generic(net, vlan_net_id);
 596                         vn->name_type = args.u.name_type;
 597                         err = 0;
 598                 } else {
 599                         err = -EINVAL;
 600                 }
 601                 break;
 602
 603         case ADD_VLAN_CMD:
 604                 err = -EPERM;
 605                 if (!capable(CAP_NET_ADMIN))
 606                         break;
 607                 err = register_vlan_device(dev, args.u.VID);
 608                 break;
 609
 610         case DEL_VLAN_CMD:
 611                 err = -EPERM;
 612                 if (!capable(CAP_NET_ADMIN))
 613                         break;
 614                 unregister_vlan_dev(dev, NULL);
 615                 err = 0;
 616                 break;
 617
 618         case GET_VLAN_REALDEV_NAME_CMD:
 619                 err = 0;
 620                 vlan_dev_get_realdev_name(dev, args.u.device2);
 621                 if (copy_to_user(arg, &args,
 622                                  sizeof(struct vlan_ioctl_args)))
 623                         err = -EFAULT;
 624                 break;
 625
 626         case GET_VLAN_VID_CMD:
 627                 err = 0;
 628                 args.u.VID = vlan_dev_vlan_id(dev);
 629                 if (copy_to_user(arg, &args,
 630                                  sizeof(struct vlan_ioctl_args)))
 631                       err = -EFAULT;
 632                 break;
 633
 634         default:
 635                 err = -EOPNOTSUPP;
 636                 break;
 637         }
 638 out:
 639         rtnl_unlock();
 640         return err;
 641 }
 642
 643 static int __net_init vlan_init_net(struct net *net)
 644 {
 645         struct vlan_net *vn = net_generic(net, vlan_net_id);
 646         int err;
 647
 648         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 649
 650         err = vlan_proc_init(net);
 651
 652         return err;
 653 }
 654
 655 static void __net_exit vlan_exit_net(struct net *net)
 656 {
 657         vlan_proc_cleanup(net);
 658 }
 659
 660 static struct pernet_operations vlan_net_ops = {
 661         .init = vlan_init_net,
 662         .exit = vlan_exit_net,
 663         .id   = &vlan_net_id,
 664         .size = sizeof(struct vlan_net),
 665 };
 666
 667 static int __init vlan_proto_init(void)
 668 {
 669         int err;
 670
 671         pr_info("%s v%s\n", vlan_fullname, vlan_version);
 672
 673         err = register_pernet_subsys(&vlan_net_ops);
 674         if (err < 0)
 675                 goto err0;
 676
 677         err = register_netdevice_notifier(&vlan_notifier_block);
 678         if (err < 0)
 679                 goto err2;
 680
 681         err = vlan_gvrp_init();
 682         if (err < 0)
 683                 goto err3;
 684
 685         err = vlan_netlink_init();
 686         if (err < 0)
 687                 goto err4;
 688
 689         vlan_ioctl_set(vlan_ioctl_handler);
 690         return 0;
 691
 692 err4:
 693         vlan_gvrp_uninit();
 694 err3:
 695         unregister_netdevice_notifier(&vlan_notifier_block);
 696 err2:
 697         unregister_pernet_subsys(&vlan_net_ops);
 698 err0:
 699         return err;
 700 }
 701
 702 static void __exit vlan_cleanup_module(void)
 703 {
 704         vlan_ioctl_set(NULL);
 705         vlan_netlink_fini();
 706
 707         unregister_netdevice_notifier(&vlan_notifier_block);
 708
 709         unregister_pernet_subsys(&vlan_net_ops);
 710         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 711
 712         vlan_gvrp_uninit();
 713 }
 714
 715 module_init(vlan_proto_init);
 716 module_exit(vlan_cleanup_module);
 717
 718 MODULE_LICENSE("GPL");
 719 MODULE_VERSION(DRV_VERSION);