release/src-rt-6.x.4708/linux/linux-2.6.36/net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: netdev@vger.kernel.org
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <linux/capability.h>
  22 #include <linux/module.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <linux/slab.h>
  26 #include <linux/init.h>
  27 #include <linux/rculist.h>
  28 #include <net/p8022.h>
  29 #include <net/arp.h>
  30 #include <linux/rtnetlink.h>
  31 #include <linux/notifier.h>
  32 #include <net/rtnetlink.h>
  33 #include <net/net_namespace.h>
  34 #include <net/netns/generic.h>
  35 #include <asm/uaccess.h>
  36
  37 #include <linux/if_vlan.h>
  38 #include "vlan.h"
  39 #include "vlanproc.h"
  40 #ifdef HNDCTF
  41 #include <ctf/hndctf.h>
  42 #endif /* HNDCTF */
  43
  44 #define DRV_VERSION "1.8"
  45
  46 /* Global VLAN variables */
  47
  48 int vlan_net_id __read_mostly;
  49
  50 /* Our listing of VLAN group(s) */
  51 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  52
  53 const char vlan_fullname[] = "802.1Q VLAN Support";
  54 const char vlan_version[] = DRV_VERSION;
  55 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  56 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  57
  58 static struct packet_type vlan_packet_type __read_mostly = {
  59         .type = cpu_to_be16(ETH_P_8021Q),
  60         .func = vlan_skb_recv, /* VLAN receive method */
  61 };
  62
  63 /* End of global variables definitions. */
  64
  65 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
  66 {
  67         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
  68 }
  69
  70 /* Must be invoked with RCU read lock (no preempt) */
  71 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
  72 {
  73         struct vlan_group *grp;
  74         struct hlist_node *n;
  75         int hash = vlan_grp_hashfn(real_dev->ifindex);
  76
  77         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
  78                 if (grp->real_dev == real_dev)
  79                         return grp;
  80         }
  81
  82         return NULL;
  83 }
  84
  85 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
  86  *
  87  * Must be invoked with RCU read lock (no preempt)
  88  */
  89 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
  90 {
  91         struct vlan_group *grp = __vlan_find_group(real_dev);
  92
  93         if (grp)
  94                 return vlan_group_get_device(grp, vlan_id);
  95
  96         return NULL;
  97 }
  98
  99 static void vlan_group_free(struct vlan_group *grp)
 100 {
 101         int i;
 102
 103         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 104                 kfree(grp->vlan_devices_arrays[i]);
 105         kfree(grp);
 106 }
 107
 108 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 109 {
 110         struct vlan_group *grp;
 111
 112         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 113         if (!grp)
 114                 return NULL;
 115
 116         grp->real_dev = real_dev;
 117         hlist_add_head_rcu(&grp->hlist,
 118                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 119         return grp;
 120 }
 121
 122 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
 123 {
 124         struct net_device **array;
 125         unsigned int size;
 126
 127         ASSERT_RTNL();
 128
 129         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 130         if (array != NULL)
 131                 return 0;
 132
 133         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 134         array = kzalloc(size, GFP_KERNEL);
 135         if (array == NULL)
 136                 return -ENOBUFS;
 137
 138         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
 139         return 0;
 140 }
 141
 142 static void vlan_rcu_free(struct rcu_head *rcu)
 143 {
 144         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 145 }
 146
 147 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
 148 {
 149         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 150         struct net_device *real_dev = vlan->real_dev;
 151         const struct net_device_ops *ops = real_dev->netdev_ops;
 152         struct vlan_group *grp;
 153         u16 vlan_id = vlan->vlan_id;
 154
 155         ASSERT_RTNL();
 156
 157         grp = __vlan_find_group(real_dev);
 158         BUG_ON(!grp);
 159
 160         /* Take it out of our own structures, but be sure to interlock with
 161          * HW accelerating devices or SW vlan input packet processing if
 162          * VLAN is not 0 (leave it there for 802.1p).
 163          */
 164         if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
 165                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
 166
 167         grp->nr_vlans--;
 168
 169         vlan_group_set_device(grp, vlan_id, NULL);
 170         if (!grp->killall)
 171                 synchronize_net();
 172
 173 #ifdef HNDCTF
 174         (void)ctf_dev_vlan_delete(kcih, real_dev, vlan_id);
 175 #endif /* HNDCTF */
 176
 177         unregister_netdevice_queue(dev, head);
 178
 179         /* If the group is now empty, kill off the group. */
 180         if (grp->nr_vlans == 0) {
 181                 vlan_gvrp_uninit_applicant(real_dev);
 182
 183                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 184                         ops->ndo_vlan_rx_register(real_dev, NULL);
 185
 186                 hlist_del_rcu(&grp->hlist);
 187
 188                 /* Free the group, after all cpu's are done. */
 189                 call_rcu(&grp->rcu, vlan_rcu_free);
 190         }
 191
 192         /* Get rid of the vlan's reference to real_dev */
 193         dev_put(real_dev);
 194 }
 195
 196 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 197 {
 198         const char *name = real_dev->name;
 199         const struct net_device_ops *ops = real_dev->netdev_ops;
 200
 201         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 202                 pr_info("8021q: VLANs not supported on %s\n", name);
 203                 return -EOPNOTSUPP;
 204         }
 205
 206         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
 207                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 208                 return -EOPNOTSUPP;
 209         }
 210
 211         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 212             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
 213                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 214                 return -EOPNOTSUPP;
 215         }
 216
 217         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 218                 return -EEXIST;
 219
 220         return 0;
 221 }
 222
 223 int register_vlan_dev(struct net_device *dev)
 224 {
 225         struct vlan_dev_info *vlan = vlan_dev_info(dev);
 226         struct net_device *real_dev = vlan->real_dev;
 227         const struct net_device_ops *ops = real_dev->netdev_ops;
 228         u16 vlan_id = vlan->vlan_id;
 229         struct vlan_group *grp, *ngrp = NULL;
 230         int err;
 231
 232         grp = __vlan_find_group(real_dev);
 233         if (!grp) {
 234                 ngrp = grp = vlan_group_alloc(real_dev);
 235                 if (!grp)
 236                         return -ENOBUFS;
 237                 err = vlan_gvrp_init_applicant(real_dev);
 238                 if (err < 0)
 239                         goto out_free_group;
 240         }
 241
 242         err = vlan_group_prealloc_vid(grp, vlan_id);
 243         if (err < 0)
 244                 goto out_uninit_applicant;
 245
 246         err = register_netdevice(dev);
 247         if (err < 0)
 248                 goto out_uninit_applicant;
 249
 250         /* Account for reference in struct vlan_dev_info */
 251         dev_hold(real_dev);
 252
 253         netif_stacked_transfer_operstate(real_dev, dev);
 254         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 255
 256         /* So, got the sucker initialized, now lets place
 257          * it into our local structure.
 258          */
 259         vlan_group_set_device(grp, vlan_id, dev);
 260         grp->nr_vlans++;
 261
 262         dev->features |= (real_dev->features & (NETIF_F_SG | NETIF_F_FRAGLIST | NETIF_F_ALL_CSUM));
 263
 264         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 265                 ops->ndo_vlan_rx_register(real_dev, ngrp);
 266         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 267                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
 268
 269         return 0;
 270
 271 out_uninit_applicant:
 272         if (ngrp)
 273                 vlan_gvrp_uninit_applicant(real_dev);
 274 out_free_group:
 275         if (ngrp) {
 276                 hlist_del_rcu(&ngrp->hlist);
 277                 /* Free the group, after all cpu's are done. */
 278                 call_rcu(&ngrp->rcu, vlan_rcu_free);
 279         }
 280         return err;
 281 }
 282
 283 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 284  *  Returns 0 if the device was created or a negative error code otherwise.
 285  */
 286 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
 287 {
 288         struct net_device *new_dev;
 289         struct net *net = dev_net(real_dev);
 290         struct vlan_net *vn = net_generic(net, vlan_net_id);
 291         char name[IFNAMSIZ];
 292         int err;
 293
 294         if (vlan_id >= VLAN_VID_MASK)
 295                 return -ERANGE;
 296
 297         err = vlan_check_real_dev(real_dev, vlan_id);
 298         if (err < 0)
 299                 return err;
 300
 301         /* Gotta set up the fields for the device. */
 302         switch (vn->name_type) {
 303         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 304                 /* name will look like:  eth1.0005 */
 305                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
 306                 break;
 307         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 308                 /* Put our vlan.VID in the name.
 309                  * Name will look like:  vlan5
 310                  */
 311                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
 312                 break;
 313         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 314                 /* Put our vlan.VID in the name.
 315                  * Name will look like:  eth0.5
 316                  */
 317                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
 318                 break;
 319         case VLAN_NAME_TYPE_PLUS_VID:
 320                 /* Put our vlan.VID in the name.
 321                  * Name will look like:  vlan0005
 322                  */
 323         default:
 324                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
 325         }
 326
 327         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
 328                                   vlan_setup, real_dev->num_tx_queues);
 329
 330         if (new_dev == NULL)
 331                 return -ENOBUFS;
 332
 333         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
 334         dev_net_set(new_dev, net);
 335         /* need 4 bytes for extra VLAN header info,
 336          * hope the underlying device can handle it.
 337          */
 338         new_dev->mtu = real_dev->mtu;
 339
 340         vlan_dev_info(new_dev)->vlan_id = vlan_id;
 341         vlan_dev_info(new_dev)->real_dev = real_dev;
 342         vlan_dev_info(new_dev)->dent = NULL;
 343         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 344
 345         new_dev->rtnl_link_ops = &vlan_link_ops;
 346         err = register_vlan_dev(new_dev);
 347         if (err < 0)
 348                 goto out_free_newdev;
 349
 350 #ifdef HNDCTF
 351         (void)ctf_dev_vlan_add(kcih, real_dev, vlan_id, new_dev);
 352 #endif /* HNDCTF */
 353
 354         return 0;
 355
 356 out_free_newdev:
 357         free_netdev(new_dev);
 358         return err;
 359 }
 360
 361 static void vlan_sync_address(struct net_device *dev,
 362                               struct net_device *vlandev)
 363 {
 364         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
 365
 366         /* May be called without an actual change */
 367         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 368                 return;
 369
 370         /* vlan address was different from the old address and is equal to
 371          * the new address */
 372         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 373             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 374                 dev_uc_del(dev, vlandev->dev_addr);
 375
 376         /* vlan address was equal to the old address and is different from
 377          * the new address */
 378         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 379             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 380                 dev_uc_add(dev, vlandev->dev_addr);
 381
 382         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 383 }
 384
 385 static void vlan_transfer_features(struct net_device *dev,
 386                                    struct net_device *vlandev)
 387 {
 388         unsigned long old_features = vlandev->features;
 389
 390         vlandev->features &= ~dev->vlan_features;
 391         vlandev->features |= dev->features & dev->vlan_features;
 392         vlandev->gso_max_size = dev->gso_max_size;
 393 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
 394         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
 395 #endif
 396         vlandev->real_num_tx_queues = dev->real_num_tx_queues;
 397         BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
 398
 399         if (old_features != vlandev->features)
 400                 netdev_features_change(vlandev);
 401 }
 402
 403 static void __vlan_device_event(struct net_device *dev, unsigned long event)
 404 {
 405         switch (event) {
 406         case NETDEV_CHANGENAME:
 407                 vlan_proc_rem_dev(dev);
 408                 if (vlan_proc_add_dev(dev) < 0)
 409                         pr_warning("8021q: failed to change proc name for %s\n",
 410                                         dev->name);
 411                 break;
 412         case NETDEV_REGISTER:
 413                 if (vlan_proc_add_dev(dev) < 0)
 414                         pr_warning("8021q: failed to add proc entry for %s\n",
 415                                         dev->name);
 416                 break;
 417         case NETDEV_UNREGISTER:
 418                 vlan_proc_rem_dev(dev);
 419                 break;
 420         }
 421 }
 422
 423 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
 424                              void *ptr)
 425 {
 426         struct net_device *dev = ptr;
 427         struct vlan_group *grp;
 428         int i, flgs;
 429         struct net_device *vlandev;
 430         struct vlan_dev_info *vlan;
 431         LIST_HEAD(list);
 432
 433         if (is_vlan_dev(dev))
 434                 __vlan_device_event(dev, event);
 435
 436         if ((event == NETDEV_UP) &&
 437             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
 438             dev->netdev_ops->ndo_vlan_rx_add_vid) {
 439                 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
 440                         dev->name);
 441                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
 442         }
 443
 444         grp = __vlan_find_group(dev);
 445         if (!grp)
 446                 goto out;
 447
 448         /* It is OK that we do not hold the group lock right now,
 449          * as we run under the RTNL lock.
 450          */
 451
 452         switch (event) {
 453         case NETDEV_CHANGE:
 454                 /* Propagate real device state to vlan devices */
 455                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 456                         vlandev = vlan_group_get_device(grp, i);
 457                         if (!vlandev)
 458                                 continue;
 459
 460                         netif_stacked_transfer_operstate(dev, vlandev);
 461                 }
 462                 break;
 463
 464         case NETDEV_CHANGEADDR:
 465                 /* Adjust unicast filters on 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                         flgs = vlandev->flags;
 472                         if (!(flgs & IFF_UP))
 473                                 continue;
 474
 475                         vlan_sync_address(dev, vlandev);
 476                 }
 477                 break;
 478
 479         case NETDEV_CHANGEMTU:
 480                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 481                         vlandev = vlan_group_get_device(grp, i);
 482                         if (!vlandev)
 483                                 continue;
 484
 485                         if (vlandev->mtu <= dev->mtu)
 486                                 continue;
 487
 488                         dev_set_mtu(vlandev, dev->mtu);
 489                 }
 490                 break;
 491
 492         case NETDEV_FEAT_CHANGE:
 493                 /* Propagate device features to underlying device */
 494                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 495                         vlandev = vlan_group_get_device(grp, i);
 496                         if (!vlandev)
 497                                 continue;
 498
 499                         vlan_transfer_features(dev, vlandev);
 500                 }
 501
 502                 break;
 503
 504         case NETDEV_DOWN:
 505                 /* Put all VLANs for this dev in the down state too.  */
 506                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 507                         vlandev = vlan_group_get_device(grp, i);
 508                         if (!vlandev)
 509                                 continue;
 510
 511                         flgs = vlandev->flags;
 512                         if (!(flgs & IFF_UP))
 513                                 continue;
 514
 515                         vlan = vlan_dev_info(vlandev);
 516                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 517                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
 518                         netif_stacked_transfer_operstate(dev, vlandev);
 519                 }
 520                 break;
 521
 522         case NETDEV_UP:
 523                 /* Put all VLANs for this dev in the up state too.  */
 524                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 525                         vlandev = vlan_group_get_device(grp, i);
 526                         if (!vlandev)
 527                                 continue;
 528
 529                         flgs = vlandev->flags;
 530                         if (flgs & IFF_UP)
 531                                 continue;
 532
 533                         vlan = vlan_dev_info(vlandev);
 534                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
 535                                 dev_change_flags(vlandev, flgs | IFF_UP);
 536                         netif_stacked_transfer_operstate(dev, vlandev);
 537                 }
 538                 break;
 539
 540         case NETDEV_UNREGISTER:
 541                 /* Delete all VLANs for this dev. */
 542                 grp->killall = 1;
 543
 544                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 545                         vlandev = vlan_group_get_device(grp, i);
 546                         if (!vlandev)
 547                                 continue;
 548
 549                         /* unregistration of last vlan destroys group, abort
 550                          * afterwards */
 551                         if (grp->nr_vlans == 1)
 552                                 i = VLAN_GROUP_ARRAY_LEN;
 553
 554                         unregister_vlan_dev(vlandev, &list);
 555                 }
 556                 unregister_netdevice_many(&list);
 557                 break;
 558
 559         case NETDEV_PRE_TYPE_CHANGE:
 560                 /* Forbid underlaying device to change its type. */
 561                 return NOTIFY_BAD;
 562         }
 563
 564 out:
 565         return NOTIFY_DONE;
 566 }
 567
 568 static struct notifier_block vlan_notifier_block __read_mostly = {
 569         .notifier_call = vlan_device_event,
 570 };
 571
 572 /*
 573  *      VLAN IOCTL handler.
 574  *      o execute requested action or pass command to the device driver
 575  *   arg is really a struct vlan_ioctl_args __user *.
 576  */
 577 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 578 {
 579         int err;
 580         struct vlan_ioctl_args args;
 581         struct net_device *dev = NULL;
 582
 583         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 584                 return -EFAULT;
 585
 586         /* Null terminate this sucker, just in case. */
 587         args.device1[23] = 0;
 588         args.u.device2[23] = 0;
 589
 590         rtnl_lock();
 591
 592         switch (args.cmd) {
 593         case SET_VLAN_INGRESS_PRIORITY_CMD:
 594         case SET_VLAN_EGRESS_PRIORITY_CMD:
 595         case SET_VLAN_FLAG_CMD:
 596         case ADD_VLAN_CMD:
 597         case DEL_VLAN_CMD:
 598         case GET_VLAN_REALDEV_NAME_CMD:
 599         case GET_VLAN_VID_CMD:
 600                 err = -ENODEV;
 601                 dev = __dev_get_by_name(net, args.device1);
 602                 if (!dev)
 603                         goto out;
 604
 605                 err = -EINVAL;
 606                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
 607                         goto out;
 608         }
 609
 610         switch (args.cmd) {
 611         case SET_VLAN_INGRESS_PRIORITY_CMD:
 612                 err = -EPERM;
 613                 if (!capable(CAP_NET_ADMIN))
 614                         break;
 615                 vlan_dev_set_ingress_priority(dev,
 616                                               args.u.skb_priority,
 617                                               args.vlan_qos);
 618                 err = 0;
 619                 break;
 620
 621         case SET_VLAN_EGRESS_PRIORITY_CMD:
 622                 err = -EPERM;
 623                 if (!capable(CAP_NET_ADMIN))
 624                         break;
 625                 err = vlan_dev_set_egress_priority(dev,
 626                                                    args.u.skb_priority,
 627                                                    args.vlan_qos);
 628                 break;
 629
 630         case SET_VLAN_FLAG_CMD:
 631                 err = -EPERM;
 632                 if (!capable(CAP_NET_ADMIN))
 633                         break;
 634                 err = vlan_dev_change_flags(dev,
 635                                             args.vlan_qos ? args.u.flag : 0,
 636                                             args.u.flag);
 637                 break;
 638
 639         case SET_VLAN_NAME_TYPE_CMD:
 640                 err = -EPERM;
 641                 if (!capable(CAP_NET_ADMIN))
 642                         break;
 643                 if ((args.u.name_type >= 0) &&
 644                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 645                         struct vlan_net *vn;
 646
 647                         vn = net_generic(net, vlan_net_id);
 648                         vn->name_type = args.u.name_type;
 649                         err = 0;
 650                 } else {
 651                         err = -EINVAL;
 652                 }
 653                 break;
 654
 655         case ADD_VLAN_CMD:
 656                 err = -EPERM;
 657                 if (!capable(CAP_NET_ADMIN))
 658                         break;
 659                 err = register_vlan_device(dev, args.u.VID);
 660                 break;
 661
 662         case DEL_VLAN_CMD:
 663                 err = -EPERM;
 664                 if (!capable(CAP_NET_ADMIN))
 665                         break;
 666                 unregister_vlan_dev(dev, NULL);
 667                 err = 0;
 668                 break;
 669
 670         case GET_VLAN_REALDEV_NAME_CMD:
 671                 err = 0;
 672                 vlan_dev_get_realdev_name(dev, args.u.device2);
 673                 if (copy_to_user(arg, &args,
 674                                  sizeof(struct vlan_ioctl_args)))
 675                         err = -EFAULT;
 676                 break;
 677
 678         case GET_VLAN_VID_CMD:
 679                 err = 0;
 680                 args.u.VID = vlan_dev_vlan_id(dev);
 681                 if (copy_to_user(arg, &args,
 682                                  sizeof(struct vlan_ioctl_args)))
 683                       err = -EFAULT;
 684                 break;
 685
 686         default:
 687                 err = -EOPNOTSUPP;
 688                 break;
 689         }
 690 out:
 691         rtnl_unlock();
 692         return err;
 693 }
 694
 695 static int __net_init vlan_init_net(struct net *net)
 696 {
 697         struct vlan_net *vn = net_generic(net, vlan_net_id);
 698         int err;
 699
 700         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
 701
 702         err = vlan_proc_init(net);
 703
 704         return err;
 705 }
 706
 707 static void __net_exit vlan_exit_net(struct net *net)
 708 {
 709         vlan_proc_cleanup(net);
 710 }
 711
 712 static struct pernet_operations vlan_net_ops = {
 713         .init = vlan_init_net,
 714         .exit = vlan_exit_net,
 715         .id   = &vlan_net_id,
 716         .size = sizeof(struct vlan_net),
 717 };
 718
 719 static int __init vlan_proto_init(void)
 720 {
 721         int err;
 722
 723         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
 724         pr_info("All bugs added by %s\n", vlan_buggyright);
 725
 726         err = register_pernet_subsys(&vlan_net_ops);
 727         if (err < 0)
 728                 goto err0;
 729
 730         err = register_netdevice_notifier(&vlan_notifier_block);
 731         if (err < 0)
 732                 goto err2;
 733
 734         err = vlan_gvrp_init();
 735         if (err < 0)
 736                 goto err3;
 737
 738         err = vlan_netlink_init();
 739         if (err < 0)
 740                 goto err4;
 741
 742         dev_add_pack(&vlan_packet_type);
 743         vlan_ioctl_set(vlan_ioctl_handler);
 744         return 0;
 745
 746 err4:
 747         vlan_gvrp_uninit();
 748 err3:
 749         unregister_netdevice_notifier(&vlan_notifier_block);
 750 err2:
 751         unregister_pernet_subsys(&vlan_net_ops);
 752 err0:
 753         return err;
 754 }
 755
 756 static void __exit vlan_cleanup_module(void)
 757 {
 758         unsigned int i;
 759
 760         vlan_ioctl_set(NULL);
 761         vlan_netlink_fini();
 762
 763         unregister_netdevice_notifier(&vlan_notifier_block);
 764
 765         dev_remove_pack(&vlan_packet_type);
 766
 767         /* This table must be empty if there are no module references left. */
 768         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
 769                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 770
 771         unregister_pernet_subsys(&vlan_net_ops);
 772         rcu_barrier(); /* Wait for completion of call_rcu()'s */
 773
 774         vlan_gvrp_uninit();
 775 }
 776
 777 module_init(vlan_proto_init);
 778 module_exit(vlan_cleanup_module);
 779
 780 MODULE_LICENSE("GPL");
 781 MODULE_VERSION(DRV_VERSION);