git.oblomov.eu Git - linux-2.6/blob - 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 <asm/uaccess.h> /* for copy_from_user */
  22 #include <linux/capability.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <net/datalink.h>
  27 #include <linux/mm.h>
  28 #include <linux/in.h>
  29 #include <linux/init.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34 #include <net/net_namespace.h>
  35 #include <net/netns/generic.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;
  46
  47 /* Our listing of VLAN group(s) */
  48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  49
  50 static char vlan_fullname[] = "802.1Q VLAN Support";
  51 static char vlan_version[] = DRV_VERSION;
  52 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  53 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  54
  55 static struct packet_type vlan_packet_type = {
  56         .type = __constant_htons(ETH_P_8021Q),
  57         .func = vlan_skb_recv, /* VLAN receive method */
  58 };
  59
  60 /* End of global variables definitions. */
  61
  62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  63 {
  64         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  65 }
  66
  67 /* Must be invoked with RCU read lock (no preempt) */
  68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  69 {
  70         struct vlan_group *grp;
  71         struct hlist_node *n;
  72         int hash = vlan_grp_hashfn(real_dev->ifindex);
  73
  74         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  75                 if (grp->real_dev == real_dev)
  76                         return grp;
  77         }
  78
  79         return NULL;
  80 }
  81
  82 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  83  *
  84  * Must be invoked with RCU read lock (no preempt)
  85  */
  86 struct net_device *__find_vlan_dev(struct net_device *real_dev,
  87                                    unsigned short VID)
  88 {
  89         struct vlan_group *grp = __vlan_find_group(real_dev);
  90
  91         if (grp)
  92                 return vlan_group_get_device(grp, VID);
  93
  94         return NULL;
  95 }
  96
  97 static void vlan_group_free(struct vlan_group *grp)
  98 {
  99         int i;
 100
 101         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 102                 kfree(grp->vlan_devices_arrays[i]);
 103         kfree(grp);
 104 }
 105
 106 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 107 {
 108         struct vlan_group *grp;
 109
 110         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 111         if (!grp)
 112                 return NULL;
 113
 114         grp->real_dev = real_dev;
 115         hlist_add_head_rcu(&grp->hlist,
 116                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 117         return grp;
 118 }
 119
 120 static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid)
 121 {
 122         struct net_device **array;
 123         unsigned int size;
 124
 125         ASSERT_RTNL();
 126
 127         array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN];
 128         if (array != NULL)
 129                 return 0;
 130
 131         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 132         array = kzalloc(size, GFP_KERNEL);
 133         if (array == NULL)
 134                 return -ENOBUFS;
 135
 136         vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array;
 137         return 0;
 138 }
 139
 140 static void vlan_rcu_free(struct rcu_head *rcu)
 141 {
 142         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 143 }
 144
 145 void unregister_vlan_dev(struct net_device *dev)
 146 {
 147         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 148         struct net_device *real_dev = vlan->real_dev;
 149         struct vlan_group *grp;
 150         unsigned short vlan_id = vlan->vlan_id;
 151
 152         ASSERT_RTNL();
 153
 154         grp = __vlan_find_group(real_dev);
 155         BUG_ON(!grp);
 156
 157         vlan_proc_rem_dev(dev);
 158
 159         /* Take it out of our own structures, but be sure to interlock with
 160          * HW accelerating devices or SW vlan input packet processing.
 161          */
 162         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 163                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 164
 165         vlan_group_set_device(grp, vlan_id, NULL);
 166         grp->nr_vlans--;
 167
 168         synchronize_net();
 169
 170         /* If the group is now empty, kill off the group. */
 171         if (grp->nr_vlans == 0) {
 172                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 173                         real_dev->vlan_rx_register(real_dev, NULL);
 174
 175                 hlist_del_rcu(&grp->hlist);
 176
 177                 /* Free the group, after all cpu's are done. */
 178                 call_rcu(&grp->rcu, vlan_rcu_free);
 179         }
 180
 181         /* Get rid of the vlan's reference to real_dev */
 182         dev_put(real_dev);
 183
 184         unregister_netdevice(dev);
 185 }
 186
 187 static void vlan_transfer_operstate(const struct net_device *dev,
 188                                     struct net_device *vlandev)
 189 {
 190         /* Have to respect userspace enforced dormant state
 191          * of real device, also must allow supplicant running
 192          * on VLAN device
 193          */
 194         if (dev->operstate == IF_OPER_DORMANT)
 195                 netif_dormant_on(vlandev);
 196         else
 197                 netif_dormant_off(vlandev);
 198
 199         if (netif_carrier_ok(dev)) {
 200                 if (!netif_carrier_ok(vlandev))
 201                         netif_carrier_on(vlandev);
 202         } else {
 203                 if (netif_carrier_ok(vlandev))
 204                         netif_carrier_off(vlandev);
 205         }
 206 }
 207
 208 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 209 {
 210         char *name = real_dev->name;
 211
 212         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 213                 pr_info("8021q: VLANs not supported on %s\n", name);
 214                 return -EOPNOTSUPP;
 215         }
 216
 217         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 218             !real_dev->vlan_rx_register) {
 219                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 220                 return -EOPNOTSUPP;
 221         }
 222
 223         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 224             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 225                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 226                 return -EOPNOTSUPP;
 227         }
 228
 229         /* The real device must be up and operating in order to
 230          * assosciate a VLAN device with it.
 231          */
 232         if (!(real_dev->flags & IFF_UP))
 233                 return -ENETDOWN;
 234
 235         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 236                 return -EEXIST;
 237
 238         return 0;
 239 }
 240
 241 int register_vlan_dev(struct net_device *dev)
 242 {
 243         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 244         struct net_device *real_dev = vlan->real_dev;
 245         unsigned short vlan_id = vlan->vlan_id;
 246         struct vlan_group *grp, *ngrp = NULL;
 247         int err;
 248
 249         grp = __vlan_find_group(real_dev);
 250         if (!grp) {
 251                 ngrp = grp = vlan_group_alloc(real_dev);
 252                 if (!grp)
 253                         return -ENOBUFS;
 254         }
 255
 256         err = vlan_group_prealloc_vid(grp, vlan_id);
 257         if (err < 0)
 258                 goto out_free_group;
 259
 260         err = register_netdevice(dev);
 261         if (err < 0)
 262                 goto out_free_group;
 263
 264         /* Account for reference in struct vlan_dev_info */
 265         dev_hold(real_dev);
 266
 267         vlan_transfer_operstate(real_dev, dev);
 268         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 269
 270         /* So, got the sucker initialized, now lets place
 271          * it into our local structure.
 272          */
 273         vlan_group_set_device(grp, vlan_id, dev);
 274         grp->nr_vlans++;
 275
 276         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 277                 real_dev->vlan_rx_register(real_dev, ngrp);
 278         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 279                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 280
 281         if (vlan_proc_add_dev(dev) < 0)
 282                 pr_warning("8021q: failed to add proc entry for %s\n",
 283                            dev->name);
 284         return 0;
 285
 286 out_free_group:
 287         if (ngrp)
 288                 vlan_group_free(ngrp);
 289         return err;
 290 }
 291
 292 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 293  *  Returns 0 if the device was created or a negative error code otherwise.
 294  */
 295 static int register_vlan_device(struct net_device *real_dev,
 296                                 unsigned short VLAN_ID)
 297 {
 298         struct net_device *new_dev;
 299         struct net *net = dev_net(real_dev);
 300         struct vlan_net *vn = net_generic(net, vlan_net_id);
 301         char name[IFNAMSIZ];
 302         int err;
 303
 304         if (VLAN_ID >= VLAN_VID_MASK)
 305                 return -ERANGE;
 306
 307         err = vlan_check_real_dev(real_dev, VLAN_ID);
 308         if (err < 0)
 309                 return err;
 310
 311         /* Gotta set up the fields for the device. */
 312         switch (vn->name_type) {
 313         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 314                 /* name will look like:  eth1.0005 */
 315                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 316                 break;
 317         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 318                 /* Put our vlan.VID in the name.
 319                  * Name will look like:  vlan5
 320                  */
 321                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 322                 break;
 323         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 324                 /* Put our vlan.VID in the name.
 325                  * Name will look like:  eth0.5
 326                  */
 327                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 328                 break;
 329         case VLAN_NAME_TYPE_PLUS_VID:
 330                 /* Put our vlan.VID in the name.
 331                  * Name will look like:  vlan0005
 332                  */
 333         default:
 334                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 335         }
 336
 337         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 338                                vlan_setup);
 339
 340         if (new_dev == NULL)
 341                 return -ENOBUFS;
 342
 343         dev_net_set(new_dev, net);
 344         /* need 4 bytes for extra VLAN header info,
 345          * hope the underlying device can handle it.
 346          */
 347         new_dev->mtu = real_dev->mtu;
 348
 349         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 350         vlan_dev_info(new_dev)->real_dev = real_dev;
 351         vlan_dev_info(new_dev)->dent = NULL;
 352         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 353
 354         new_dev->rtnl_link_ops = &vlan_link_ops;
 355         err = register_vlan_dev(new_dev);
 356         if (err < 0)
 357                 goto out_free_newdev;
 358
 359         return 0;
 360
 361 out_free_newdev:
 362         free_netdev(new_dev);
 363         return err;
 364 }
 365
 366 static void vlan_sync_address(struct net_device *dev,
 367                               struct net_device *vlandev)
 368 {
 369         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 370
 371         /* May be called without an actual change */
 372         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 373                 return;
 374
 375         /* vlan address was different from the old address and is equal to
 376          * the new address */
 377         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 378             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 379                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 380
 381         /* vlan address was equal to the old address and is different from
 382          * the new address */
 383         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 384             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 385                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 386
 387         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 388 }
 389
 390 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 391 {
 392         switch (event) {
 393         case NETDEV_CHANGENAME:
 394                 vlan_proc_rem_dev(dev);
 395                 if (vlan_proc_add_dev(dev) < 0)
 396                         pr_warning("8021q: failed to change proc name for %s\n",
 397                                         dev->name);
 398                 break;
 399         }
 400 }
 401
 402 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 403                              void *ptr)
 404 {
 405         struct net_device *dev = ptr;
 406         struct vlan_group *grp;
 407         int i, flgs;
 408         struct net_device *vlandev;
 409
 410         if (is_vlan_dev(dev)) {
 411                 __vlan_device_event(dev, event);
 412                 goto out;
 413         }
 414
 415         grp = __vlan_find_group(dev);
 416         if (!grp)
 417                 goto out;
 418
 419         /* It is OK that we do not hold the group lock right now,
 420          * as we run under the RTNL lock.
 421          */
 422
 423         switch (event) {
 424         case NETDEV_CHANGE:
 425                 /* Propagate real device state to vlan devices */
 426                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 427                         vlandev = vlan_group_get_device(grp, i);
 428                         if (!vlandev)
 429                                 continue;
 430
 431                         vlan_transfer_operstate(dev, vlandev);
 432                 }
 433                 break;
 434
 435         case NETDEV_CHANGEADDR:
 436                 /* Adjust unicast filters on underlying device */
 437                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; 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_sync_address(dev, vlandev);
 447                 }
 448                 break;
 449
 450         case NETDEV_DOWN:
 451                 /* Put all VLANs for this dev in the down state too.  */
 452                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 453                         vlandev = vlan_group_get_device(grp, i);
 454                         if (!vlandev)
 455                                 continue;
 456
 457                         flgs = vlandev->flags;
 458                         if (!(flgs & IFF_UP))
 459                                 continue;
 460
 461                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 462                 }
 463                 break;
 464
 465         case NETDEV_UP:
 466                 /* Put all VLANs for this dev in the up state too.  */
 467                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 468                         vlandev = vlan_group_get_device(grp, i);
 469                         if (!vlandev)
 470                                 continue;
 471
 472                         flgs = vlandev->flags;
 473                         if (flgs & IFF_UP)
 474                                 continue;
 475
 476                         dev_change_flags(vlandev, flgs | IFF_UP);
 477                 }
 478                 break;
 479
 480         case NETDEV_UNREGISTER:
 481                 /* Delete all VLANs for this dev. */
 482                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 483                         vlandev = vlan_group_get_device(grp, i);
 484                         if (!vlandev)
 485                                 continue;
 486
 487                         /* unregistration of last vlan destroys group, abort
 488                          * afterwards */
 489                         if (grp->nr_vlans == 1)
 490                                 i = VLAN_GROUP_ARRAY_LEN;
 491
 492                         unregister_vlan_dev(vlandev);
 493                 }
 494                 break;
 495         }
 496
 497 out:
 498         return NOTIFY_DONE;
 499 }
 500
 501 static struct notifier_block vlan_notifier_block __read_mostly = {
 502         .notifier_call = vlan_device_event,
 503 };
 504
 505 /*
 506  *      VLAN IOCTL handler.
 507  *      o execute requested action or pass command to the device driver
 508  *   arg is really a struct vlan_ioctl_args __user *.
 509  */
 510 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 511 {
 512         int err;
 513         unsigned short vid = 0;
 514         struct vlan_ioctl_args args;
 515         struct net_device *dev = NULL;
 516
 517         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 518                 return -EFAULT;
 519
 520         /* Null terminate this sucker, just in case. */
 521         args.device1[23] = 0;
 522         args.u.device2[23] = 0;
 523
 524         rtnl_lock();
 525
 526         switch (args.cmd) {
 527         case SET_VLAN_INGRESS_PRIORITY_CMD:
 528         case SET_VLAN_EGRESS_PRIORITY_CMD:
 529         case SET_VLAN_FLAG_CMD:
 530         case ADD_VLAN_CMD:
 531         case DEL_VLAN_CMD:
 532         case GET_VLAN_REALDEV_NAME_CMD:
 533         case GET_VLAN_VID_CMD:
 534                 err = -ENODEV;
 535                 dev = __dev_get_by_name(net, args.device1);
 536                 if (!dev)
 537                         goto out;
 538
 539                 err = -EINVAL;
 540                 if (args.cmd != ADD_VLAN_CMD &&
 541                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 542                         goto out;
 543         }
 544
 545         switch (args.cmd) {
 546         case SET_VLAN_INGRESS_PRIORITY_CMD:
 547                 err = -EPERM;
 548                 if (!capable(CAP_NET_ADMIN))
 549                         break;
 550                 vlan_dev_set_ingress_priority(dev,
 551                                               args.u.skb_priority,
 552                                               args.vlan_qos);
 553                 err = 0;
 554                 break;
 555
 556         case SET_VLAN_EGRESS_PRIORITY_CMD:
 557                 err = -EPERM;
 558                 if (!capable(CAP_NET_ADMIN))
 559                         break;
 560                 err = vlan_dev_set_egress_priority(dev,
 561                                                    args.u.skb_priority,
 562                                                    args.vlan_qos);
 563                 break;
 564
 565         case SET_VLAN_FLAG_CMD:
 566                 err = -EPERM;
 567                 if (!capable(CAP_NET_ADMIN))
 568                         break;
 569                 err = vlan_dev_set_vlan_flag(dev,
 570                                              args.u.flag,
 571                                              args.vlan_qos);
 572                 break;
 573
 574         case SET_VLAN_NAME_TYPE_CMD:
 575                 err = -EPERM;
 576                 if (!capable(CAP_NET_ADMIN))
 577                         break;
 578                 if ((args.u.name_type >= 0) &&
 579                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 580                         struct vlan_net *vn;
 581
 582                         vn = net_generic(net, vlan_net_id);
 583                         vn->name_type = args.u.name_type;
 584                         err = 0;
 585                 } else {
 586                         err = -EINVAL;
 587                 }
 588                 break;
 589
 590         case ADD_VLAN_CMD:
 591                 err = -EPERM;
 592                 if (!capable(CAP_NET_ADMIN))
 593                         break;
 594                 err = register_vlan_device(dev, args.u.VID);
 595                 break;
 596
 597         case DEL_VLAN_CMD:
 598                 err = -EPERM;
 599                 if (!capable(CAP_NET_ADMIN))
 600                         break;
 601                 unregister_vlan_dev(dev);
 602                 err = 0;
 603                 break;
 604
 605         case GET_VLAN_REALDEV_NAME_CMD:
 606                 err = 0;
 607                 vlan_dev_get_realdev_name(dev, args.u.device2);
 608                 if (copy_to_user(arg, &args,
 609                                  sizeof(struct vlan_ioctl_args)))
 610                         err = -EFAULT;
 611                 break;
 612
 613         case GET_VLAN_VID_CMD:
 614                 err = 0;
 615                 vlan_dev_get_vid(dev, &vid);
 616                 args.u.VID = vid;
 617                 if (copy_to_user(arg, &args,
 618                                  sizeof(struct vlan_ioctl_args)))
 619                       err = -EFAULT;
 620                 break;
 621
 622         default:
 623                 err = -EOPNOTSUPP;
 624                 break;
 625         }
 626 out:
 627         rtnl_unlock();
 628         return err;
 629 }
 630
 631 static int vlan_init_net(struct net *net)
 632 {
 633         int err;
 634         struct vlan_net *vn;
 635
 636         err = -ENOMEM;
 637         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 638         if (vn == NULL)
 639                 goto err_alloc;
 640
 641         err = net_assign_generic(net, vlan_net_id, vn);
 642         if (err < 0)
 643                 goto err_assign;
 644
 645         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 646
 647         err = vlan_proc_init(net);
 648         if (err < 0)
 649                 goto err_proc;
 650
 651         return 0;
 652
 653 err_proc:
 654         /* nothing */
 655 err_assign:
 656         kfree(vn);
 657 err_alloc:
 658         return err;
 659 }
 660
 661 static void vlan_exit_net(struct net *net)
 662 {
 663         struct vlan_net *vn;
 664
 665         vn = net_generic(net, vlan_net_id);
 666         rtnl_kill_links(net, &vlan_link_ops);
 667         vlan_proc_cleanup(net);
 668         kfree(vn);
 669 }
 670
 671 static struct pernet_operations vlan_net_ops = {
 672         .init = vlan_init_net,
 673         .exit = vlan_exit_net,
 674 };
 675
 676 static int __init vlan_proto_init(void)
 677 {
 678         int err;
 679
 680         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 681         pr_info("All bugs added by %s\n", vlan_buggyright);
 682
 683         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 684         if (err < 0)
 685                 goto err0;
 686
 687         err = register_netdevice_notifier(&vlan_notifier_block);
 688         if (err < 0)
 689                 goto err2;
 690
 691         err = vlan_netlink_init();
 692         if (err < 0)
 693                 goto err3;
 694
 695         dev_add_pack(&vlan_packet_type);
 696         vlan_ioctl_set(vlan_ioctl_handler);
 697         return 0;
 698
 699 err3:
 700         unregister_netdevice_notifier(&vlan_notifier_block);
 701 err2:
 702         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 703 err0:
 704         return err;
 705 }
 706
 707 static void __exit vlan_cleanup_module(void)
 708 {
 709         unsigned int i;
 710
 711         vlan_ioctl_set(NULL);
 712         vlan_netlink_fini();
 713
 714         unregister_netdevice_notifier(&vlan_notifier_block);
 715
 716         dev_remove_pack(&vlan_packet_type);
 717
 718         /* This table must be empty if there are no module references left. */
 719         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 720                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 721
 722         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 723
 724         synchronize_net();
 725 }
 726
 727 module_init(vlan_proto_init);
 728 module_exit(vlan_cleanup_module);
 729
 730 MODULE_LICENSE("GPL");
 731 MODULE_VERSION(DRV_VERSION);