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 <linux/rculist.h>
  31 #include <net/p8022.h>
  32 #include <net/arp.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/notifier.h>
  35 #include <net/net_namespace.h>
  36 #include <net/netns/generic.h>
  37
  38 #include <linux/if_vlan.h>
  39 #include "vlan.h"
  40 #include "vlanproc.h"
  41
  42 #define DRV_VERSION "1.8"
  43
  44 /* Global VLAN variables */
  45
  46 int vlan_net_id;
  47
  48 /* Our listing of VLAN group(s) */
  49 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  50
  51 static char vlan_fullname[] = "802.1Q VLAN Support";
  52 static char vlan_version[] = DRV_VERSION;
  53 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  54 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  55
  56 static struct packet_type vlan_packet_type = {
  57         .type = __constant_htons(ETH_P_8021Q),
  58         .func = vlan_skb_recv, /* VLAN receive method */
  59 };
  60
  61 /* End of global variables definitions. */
  62
  63 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  64 {
  65         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  66 }
  67
  68 /* Must be invoked with RCU read lock (no preempt) */
  69 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  70 {
  71         struct vlan_group *grp;
  72         struct hlist_node *n;
  73         int hash = vlan_grp_hashfn(real_dev->ifindex);
  74
  75         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  76                 if (grp->real_dev == real_dev)
  77                         return grp;
  78         }
  79
  80         return NULL;
  81 }
  82
  83 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  84  *
  85  * Must be invoked with RCU read lock (no preempt)
  86  */
  87 struct net_device *__find_vlan_dev(struct net_device *real_dev,
  88                                    unsigned short VID)
  89 {
  90         struct vlan_group *grp = __vlan_find_group(real_dev);
  91
  92         if (grp)
  93                 return vlan_group_get_device(grp, VID);
  94
  95         return NULL;
  96 }
  97
  98 static void vlan_group_free(struct vlan_group *grp)
  99 {
 100         int i;
 101
 102         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 103                 kfree(grp->vlan_devices_arrays[i]);
 104         kfree(grp);
 105 }
 106
 107 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 108 {
 109         struct vlan_group *grp;
 110
 111         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 112         if (!grp)
 113                 return NULL;
 114
 115         grp->real_dev = real_dev;
 116         hlist_add_head_rcu(&grp->hlist,
 117                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 118         return grp;
 119 }
 120
 121 static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid)
 122 {
 123         struct net_device **array;
 124         unsigned int size;
 125
 126         ASSERT_RTNL();
 127
 128         array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN];
 129         if (array != NULL)
 130                 return 0;
 131
 132         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 133         array = kzalloc(size, GFP_KERNEL);
 134         if (array == NULL)
 135                 return -ENOBUFS;
 136
 137         vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array;
 138         return 0;
 139 }
 140
 141 static void vlan_rcu_free(struct rcu_head *rcu)
 142 {
 143         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 144 }
 145
 146 void unregister_vlan_dev(struct net_device *dev)
 147 {
 148         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 149         struct net_device *real_dev = vlan->real_dev;
 150         struct vlan_group *grp;
 151         unsigned short vlan_id = vlan->vlan_id;
 152
 153         ASSERT_RTNL();
 154
 155         grp = __vlan_find_group(real_dev);
 156         BUG_ON(!grp);
 157
 158         /* Take it out of our own structures, but be sure to interlock with
 159          * HW accelerating devices or SW vlan input packet processing.
 160          */
 161         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 162                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 163
 164         vlan_group_set_device(grp, vlan_id, NULL);
 165         grp->nr_vlans--;
 166
 167         synchronize_net();
 168
 169         /* If the group is now empty, kill off the group. */
 170         if (grp->nr_vlans == 0) {
 171                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 172                         real_dev->vlan_rx_register(real_dev, NULL);
 173
 174                 hlist_del_rcu(&grp->hlist);
 175
 176                 /* Free the group, after all cpu's are done. */
 177                 call_rcu(&grp->rcu, vlan_rcu_free);
 178         }
 179
 180         /* Get rid of the vlan's reference to real_dev */
 181         dev_put(real_dev);
 182
 183         unregister_netdevice(dev);
 184 }
 185
 186 static void vlan_transfer_operstate(const struct net_device *dev,
 187                                     struct net_device *vlandev)
 188 {
 189         /* Have to respect userspace enforced dormant state
 190          * of real device, also must allow supplicant running
 191          * on VLAN device
 192          */
 193         if (dev->operstate == IF_OPER_DORMANT)
 194                 netif_dormant_on(vlandev);
 195         else
 196                 netif_dormant_off(vlandev);
 197
 198         if (netif_carrier_ok(dev)) {
 199                 if (!netif_carrier_ok(vlandev))
 200                         netif_carrier_on(vlandev);
 201         } else {
 202                 if (netif_carrier_ok(vlandev))
 203                         netif_carrier_off(vlandev);
 204         }
 205 }
 206
 207 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 208 {
 209         char *name = real_dev->name;
 210
 211         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 212                 pr_info("8021q: VLANs not supported on %s\n", name);
 213                 return -EOPNOTSUPP;
 214         }
 215
 216         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 217             !real_dev->vlan_rx_register) {
 218                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 219                 return -EOPNOTSUPP;
 220         }
 221
 222         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 223             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 224                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 225                 return -EOPNOTSUPP;
 226         }
 227
 228         /* The real device must be up and operating in order to
 229          * assosciate a VLAN device with it.
 230          */
 231         if (!(real_dev->flags & IFF_UP))
 232                 return -ENETDOWN;
 233
 234         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 235                 return -EEXIST;
 236
 237         return 0;
 238 }
 239
 240 int register_vlan_dev(struct net_device *dev)
 241 {
 242         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 243         struct net_device *real_dev = vlan->real_dev;
 244         unsigned short vlan_id = vlan->vlan_id;
 245         struct vlan_group *grp, *ngrp = NULL;
 246         int err;
 247
 248         grp = __vlan_find_group(real_dev);
 249         if (!grp) {
 250                 ngrp = grp = vlan_group_alloc(real_dev);
 251                 if (!grp)
 252                         return -ENOBUFS;
 253         }
 254
 255         err = vlan_group_prealloc_vid(grp, vlan_id);
 256         if (err < 0)
 257                 goto out_free_group;
 258
 259         err = register_netdevice(dev);
 260         if (err < 0)
 261                 goto out_free_group;
 262
 263         /* Account for reference in struct vlan_dev_info */
 264         dev_hold(real_dev);
 265
 266         vlan_transfer_operstate(real_dev, dev);
 267         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 268
 269         /* So, got the sucker initialized, now lets place
 270          * it into our local structure.
 271          */
 272         vlan_group_set_device(grp, vlan_id, dev);
 273         grp->nr_vlans++;
 274
 275         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 276                 real_dev->vlan_rx_register(real_dev, ngrp);
 277         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 278                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 279
 280         return 0;
 281
 282 out_free_group:
 283         if (ngrp)
 284                 vlan_group_free(ngrp);
 285         return err;
 286 }
 287
 288 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 289  *  Returns 0 if the device was created or a negative error code otherwise.
 290  */
 291 static int register_vlan_device(struct net_device *real_dev,
 292                                 unsigned short VLAN_ID)
 293 {
 294         struct net_device *new_dev;
 295         struct net *net = dev_net(real_dev);
 296         struct vlan_net *vn = net_generic(net, vlan_net_id);
 297         char name[IFNAMSIZ];
 298         int err;
 299
 300         if (VLAN_ID >= VLAN_VID_MASK)
 301                 return -ERANGE;
 302
 303         err = vlan_check_real_dev(real_dev, VLAN_ID);
 304         if (err < 0)
 305                 return err;
 306
 307         /* Gotta set up the fields for the device. */
 308         switch (vn->name_type) {
 309         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 310                 /* name will look like:  eth1.0005 */
 311                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 312                 break;
 313         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 314                 /* Put our vlan.VID in the name.
 315                  * Name will look like:  vlan5
 316                  */
 317                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 318                 break;
 319         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 320                 /* Put our vlan.VID in the name.
 321                  * Name will look like:  eth0.5
 322                  */
 323                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 324                 break;
 325         case VLAN_NAME_TYPE_PLUS_VID:
 326                 /* Put our vlan.VID in the name.
 327                  * Name will look like:  vlan0005
 328                  */
 329         default:
 330                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 331         }
 332
 333         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 334                                vlan_setup);
 335
 336         if (new_dev == NULL)
 337                 return -ENOBUFS;
 338
 339         dev_net_set(new_dev, net);
 340         /* need 4 bytes for extra VLAN header info,
 341          * hope the underlying device can handle it.
 342          */
 343         new_dev->mtu = real_dev->mtu;
 344
 345         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 346         vlan_dev_info(new_dev)->real_dev = real_dev;
 347         vlan_dev_info(new_dev)->dent = NULL;
 348         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 349
 350         new_dev->rtnl_link_ops = &vlan_link_ops;
 351         err = register_vlan_dev(new_dev);
 352         if (err < 0)
 353                 goto out_free_newdev;
 354
 355         return 0;
 356
 357 out_free_newdev:
 358         free_netdev(new_dev);
 359         return err;
 360 }
 361
 362 static void vlan_sync_address(struct net_device *dev,
 363                               struct net_device *vlandev)
 364 {
 365         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 366
 367         /* May be called without an actual change */
 368         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 369                 return;
 370
 371         /* vlan address was different from the old address and is equal to
 372          * the new address */
 373         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 374             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 375                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 376
 377         /* vlan address was equal to the old address and is different from
 378          * the new address */
 379         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 380             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 381                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 382
 383         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 384 }
 385
 386 static void vlan_transfer_features(struct net_device *dev,
 387                                    struct net_device *vlandev)
 388 {
 389         unsigned long old_features = vlandev->features;
 390
 391         vlandev->features &= ~dev->vlan_features;
 392         vlandev->features |= dev->features & dev->vlan_features;
 393
 394         if (old_features != vlandev->features)
 395                 netdev_features_change(vlandev);
 396 }
 397
 398 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 399 {
 400         switch (event) {
 401         case NETDEV_CHANGENAME:
 402                 vlan_proc_rem_dev(dev);
 403                 if (vlan_proc_add_dev(dev) < 0)
 404                         pr_warning("8021q: failed to change proc name for %s\n",
 405                                         dev->name);
 406                 break;
 407         case NETDEV_REGISTER:
 408                 if (vlan_proc_add_dev(dev) < 0)
 409                         pr_warning("8021q: failed to add proc entry for %s\n",
 410                                         dev->name);
 411                 break;
 412         case NETDEV_UNREGISTER:
 413                 vlan_proc_rem_dev(dev);
 414                 break;
 415         }
 416 }
 417
 418 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 419                              void *ptr)
 420 {
 421         struct net_device *dev = ptr;
 422         struct vlan_group *grp;
 423         int i, flgs;
 424         struct net_device *vlandev;
 425
 426         if (is_vlan_dev(dev))
 427                 __vlan_device_event(dev, event);
 428
 429         grp = __vlan_find_group(dev);
 430         if (!grp)
 431                 goto out;
 432
 433         /* It is OK that we do not hold the group lock right now,
 434          * as we run under the RTNL lock.
 435          */
 436
 437         switch (event) {
 438         case NETDEV_CHANGE:
 439                 /* Propagate real device state to vlan devices */
 440                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 441                         vlandev = vlan_group_get_device(grp, i);
 442                         if (!vlandev)
 443                                 continue;
 444
 445                         vlan_transfer_operstate(dev, vlandev);
 446                 }
 447                 break;
 448
 449         case NETDEV_CHANGEADDR:
 450                 /* Adjust unicast filters on underlying device */
 451                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 452                         vlandev = vlan_group_get_device(grp, i);
 453                         if (!vlandev)
 454                                 continue;
 455
 456                         flgs = vlandev->flags;
 457                         if (!(flgs & IFF_UP))
 458                                 continue;
 459
 460                         vlan_sync_address(dev, vlandev);
 461                 }
 462                 break;
 463
 464         case NETDEV_FEAT_CHANGE:
 465                 /* Propagate device features to underlying device */
 466                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 467                         vlandev = vlan_group_get_device(grp, i);
 468                         if (!vlandev)
 469                                 continue;
 470
 471                         vlan_transfer_features(dev, vlandev);
 472                 }
 473
 474                 break;
 475
 476         case NETDEV_DOWN:
 477                 /* Put all VLANs for this dev in the down state too.  */
 478                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 479                         vlandev = vlan_group_get_device(grp, i);
 480                         if (!vlandev)
 481                                 continue;
 482
 483                         flgs = vlandev->flags;
 484                         if (!(flgs & IFF_UP))
 485                                 continue;
 486
 487                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 488                 }
 489                 break;
 490
 491         case NETDEV_UP:
 492                 /* Put all VLANs for this dev in the up state too.  */
 493                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 494                         vlandev = vlan_group_get_device(grp, i);
 495                         if (!vlandev)
 496                                 continue;
 497
 498                         flgs = vlandev->flags;
 499                         if (flgs & IFF_UP)
 500                                 continue;
 501
 502                         dev_change_flags(vlandev, flgs | IFF_UP);
 503                 }
 504                 break;
 505
 506         case NETDEV_UNREGISTER:
 507                 /* Delete all VLANs for this dev. */
 508                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 509                         vlandev = vlan_group_get_device(grp, i);
 510                         if (!vlandev)
 511                                 continue;
 512
 513                         /* unregistration of last vlan destroys group, abort
 514                          * afterwards */
 515                         if (grp->nr_vlans == 1)
 516                                 i = VLAN_GROUP_ARRAY_LEN;
 517
 518                         unregister_vlan_dev(vlandev);
 519                 }
 520                 break;
 521         }
 522
 523 out:
 524         return NOTIFY_DONE;
 525 }
 526
 527 static struct notifier_block vlan_notifier_block __read_mostly = {
 528         .notifier_call = vlan_device_event,
 529 };
 530
 531 /*
 532  *      VLAN IOCTL handler.
 533  *      o execute requested action or pass command to the device driver
 534  *   arg is really a struct vlan_ioctl_args __user *.
 535  */
 536 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 537 {
 538         int err;
 539         unsigned short vid = 0;
 540         struct vlan_ioctl_args args;
 541         struct net_device *dev = NULL;
 542
 543         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 544                 return -EFAULT;
 545
 546         /* Null terminate this sucker, just in case. */
 547         args.device1[23] = 0;
 548         args.u.device2[23] = 0;
 549
 550         rtnl_lock();
 551
 552         switch (args.cmd) {
 553         case SET_VLAN_INGRESS_PRIORITY_CMD:
 554         case SET_VLAN_EGRESS_PRIORITY_CMD:
 555         case SET_VLAN_FLAG_CMD:
 556         case ADD_VLAN_CMD:
 557         case DEL_VLAN_CMD:
 558         case GET_VLAN_REALDEV_NAME_CMD:
 559         case GET_VLAN_VID_CMD:
 560                 err = -ENODEV;
 561                 dev = __dev_get_by_name(net, args.device1);
 562                 if (!dev)
 563                         goto out;
 564
 565                 err = -EINVAL;
 566                 if (args.cmd != ADD_VLAN_CMD &&
 567                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 568                         goto out;
 569         }
 570
 571         switch (args.cmd) {
 572         case SET_VLAN_INGRESS_PRIORITY_CMD:
 573                 err = -EPERM;
 574                 if (!capable(CAP_NET_ADMIN))
 575                         break;
 576                 vlan_dev_set_ingress_priority(dev,
 577                                               args.u.skb_priority,
 578                                               args.vlan_qos);
 579                 err = 0;
 580                 break;
 581
 582         case SET_VLAN_EGRESS_PRIORITY_CMD:
 583                 err = -EPERM;
 584                 if (!capable(CAP_NET_ADMIN))
 585                         break;
 586                 err = vlan_dev_set_egress_priority(dev,
 587                                                    args.u.skb_priority,
 588                                                    args.vlan_qos);
 589                 break;
 590
 591         case SET_VLAN_FLAG_CMD:
 592                 err = -EPERM;
 593                 if (!capable(CAP_NET_ADMIN))
 594                         break;
 595                 err = vlan_dev_set_vlan_flag(dev,
 596                                              args.u.flag,
 597                                              args.vlan_qos);
 598                 break;
 599
 600         case SET_VLAN_NAME_TYPE_CMD:
 601                 err = -EPERM;
 602                 if (!capable(CAP_NET_ADMIN))
 603                         break;
 604                 if ((args.u.name_type >= 0) &&
 605                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 606                         struct vlan_net *vn;
 607
 608                         vn = net_generic(net, vlan_net_id);
 609                         vn->name_type = args.u.name_type;
 610                         err = 0;
 611                 } else {
 612                         err = -EINVAL;
 613                 }
 614                 break;
 615
 616         case ADD_VLAN_CMD:
 617                 err = -EPERM;
 618                 if (!capable(CAP_NET_ADMIN))
 619                         break;
 620                 err = register_vlan_device(dev, args.u.VID);
 621                 break;
 622
 623         case DEL_VLAN_CMD:
 624                 err = -EPERM;
 625                 if (!capable(CAP_NET_ADMIN))
 626                         break;
 627                 unregister_vlan_dev(dev);
 628                 err = 0;
 629                 break;
 630
 631         case GET_VLAN_REALDEV_NAME_CMD:
 632                 err = 0;
 633                 vlan_dev_get_realdev_name(dev, args.u.device2);
 634                 if (copy_to_user(arg, &args,
 635                                  sizeof(struct vlan_ioctl_args)))
 636                         err = -EFAULT;
 637                 break;
 638
 639         case GET_VLAN_VID_CMD:
 640                 err = 0;
 641                 vlan_dev_get_vid(dev, &vid);
 642                 args.u.VID = vid;
 643                 if (copy_to_user(arg, &args,
 644                                  sizeof(struct vlan_ioctl_args)))
 645                       err = -EFAULT;
 646                 break;
 647
 648         default:
 649                 err = -EOPNOTSUPP;
 650                 break;
 651         }
 652 out:
 653         rtnl_unlock();
 654         return err;
 655 }
 656
 657 static int vlan_init_net(struct net *net)
 658 {
 659         int err;
 660         struct vlan_net *vn;
 661
 662         err = -ENOMEM;
 663         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
 664         if (vn == NULL)
 665                 goto err_alloc;
 666
 667         err = net_assign_generic(net, vlan_net_id, vn);
 668         if (err < 0)
 669                 goto err_assign;
 670
 671         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 672
 673         err = vlan_proc_init(net);
 674         if (err < 0)
 675                 goto err_proc;
 676
 677         return 0;
 678
 679 err_proc:
 680         /* nothing */
 681 err_assign:
 682         kfree(vn);
 683 err_alloc:
 684         return err;
 685 }
 686
 687 static void vlan_exit_net(struct net *net)
 688 {
 689         struct vlan_net *vn;
 690
 691         vn = net_generic(net, vlan_net_id);
 692         rtnl_kill_links(net, &vlan_link_ops);
 693         vlan_proc_cleanup(net);
 694         kfree(vn);
 695 }
 696
 697 static struct pernet_operations vlan_net_ops = {
 698         .init = vlan_init_net,
 699         .exit = vlan_exit_net,
 700 };
 701
 702 static int __init vlan_proto_init(void)
 703 {
 704         int err;
 705
 706         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 707         pr_info("All bugs added by %s\n", vlan_buggyright);
 708
 709         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
 710         if (err < 0)
 711                 goto err0;
 712
 713         err = register_netdevice_notifier(&vlan_notifier_block);
 714         if (err < 0)
 715                 goto err2;
 716
 717         err = vlan_netlink_init();
 718         if (err < 0)
 719                 goto err3;
 720
 721         dev_add_pack(&vlan_packet_type);
 722         vlan_ioctl_set(vlan_ioctl_handler);
 723         return 0;
 724
 725 err3:
 726         unregister_netdevice_notifier(&vlan_notifier_block);
 727 err2:
 728         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 729 err0:
 730         return err;
 731 }
 732
 733 static void __exit vlan_cleanup_module(void)
 734 {
 735         unsigned int i;
 736
 737         vlan_ioctl_set(NULL);
 738         vlan_netlink_fini();
 739
 740         unregister_netdevice_notifier(&vlan_notifier_block);
 741
 742         dev_remove_pack(&vlan_packet_type);
 743
 744         /* This table must be empty if there are no module references left. */
 745         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 746                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 747
 748         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
 749
 750         synchronize_net();
 751 }
 752
 753 module_init(vlan_proto_init);
 754 module_exit(vlan_cleanup_module);
 755
 756 MODULE_LICENSE("GPL");
 757 MODULE_VERSION(DRV_VERSION);