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: vlan@scry.wanfear.com
   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
  36 #include <linux/if_vlan.h>
  37 #include "vlan.h"
  38 #include "vlanproc.h"
  39
  40 #define DRV_VERSION "1.8"
  41
  42 /* Global VLAN variables */
  43
  44 /* Our listing of VLAN group(s) */
  45 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  46 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  47
  48 static char vlan_fullname[] = "802.1Q VLAN Support";
  49 static char vlan_version[] = DRV_VERSION;
  50 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  51 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  52
  53 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  54 static int vlan_ioctl_handler(struct net *net, void __user *);
  55 static int unregister_vlan_dev(struct net_device *, unsigned short );
  56
  57 static struct notifier_block vlan_notifier_block = {
  58         .notifier_call = vlan_device_event,
  59 };
  60
  61 /* These may be changed at run-time through IOCTLs */
  62
  63 /* Determines interface naming scheme. */
  64 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  65
  66 static struct packet_type vlan_packet_type = {
  67         .type = __constant_htons(ETH_P_8021Q),
  68         .func = vlan_skb_recv, /* VLAN receive method */
  69 };
  70
  71 /* End of global variables definitions. */
  72
  73 /*
  74  * Function vlan_proto_init (pro)
  75  *
  76  *    Initialize VLAN protocol layer,
  77  *
  78  */
  79 static int __init vlan_proto_init(void)
  80 {
  81         int err;
  82
  83         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
  84         pr_info("All bugs added by %s\n", vlan_buggyright);
  85
  86         /* proc file system initialization */
  87         err = vlan_proc_init();
  88         if (err < 0) {
  89                 pr_err("%s: can't create entry in proc filesystem!\n",
  90                        __FUNCTION__);
  91                 return err;
  92         }
  93
  94         dev_add_pack(&vlan_packet_type);
  95
  96         /* Register us to receive netdevice events */
  97         err = register_netdevice_notifier(&vlan_notifier_block);
  98         if (err < 0)
  99                 goto err1;
 100
 101         err = vlan_netlink_init();
 102         if (err < 0)
 103                 goto err2;
 104
 105         vlan_ioctl_set(vlan_ioctl_handler);
 106         return 0;
 107
 108 err2:
 109         unregister_netdevice_notifier(&vlan_notifier_block);
 110 err1:
 111         vlan_proc_cleanup();
 112         dev_remove_pack(&vlan_packet_type);
 113         return err;
 114 }
 115
 116 /*
 117  *     Module 'remove' entry point.
 118  *     o delete /proc/net/router directory and static entries.
 119  */
 120 static void __exit vlan_cleanup_module(void)
 121 {
 122         int i;
 123
 124         vlan_ioctl_set(NULL);
 125         vlan_netlink_fini();
 126
 127         /* Un-register us from receiving netdevice events */
 128         unregister_netdevice_notifier(&vlan_notifier_block);
 129
 130         dev_remove_pack(&vlan_packet_type);
 131
 132         /* This table must be empty if there are no module
 133          * references left.
 134          */
 135         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 136                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 137         }
 138         vlan_proc_cleanup();
 139
 140         synchronize_net();
 141 }
 142
 143 module_init(vlan_proto_init);
 144 module_exit(vlan_cleanup_module);
 145
 146 /* Must be invoked with RCU read lock (no preempt) */
 147 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 148 {
 149         struct vlan_group *grp;
 150         struct hlist_node *n;
 151         int hash = vlan_grp_hashfn(real_dev_ifindex);
 152
 153         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 154                 if (grp->real_dev_ifindex == real_dev_ifindex)
 155                         return grp;
 156         }
 157
 158         return NULL;
 159 }
 160
 161 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 162  *
 163  * Must be invoked with RCU read lock (no preempt)
 164  */
 165 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 166                                    unsigned short VID)
 167 {
 168         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 169
 170         if (grp)
 171                 return vlan_group_get_device(grp, VID);
 172
 173         return NULL;
 174 }
 175
 176 static void vlan_group_free(struct vlan_group *grp)
 177 {
 178         int i;
 179
 180         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 181                 kfree(grp->vlan_devices_arrays[i]);
 182         kfree(grp);
 183 }
 184
 185 static struct vlan_group *vlan_group_alloc(int ifindex)
 186 {
 187         struct vlan_group *grp;
 188         unsigned int size;
 189         unsigned int i;
 190
 191         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 192         if (!grp)
 193                 return NULL;
 194
 195         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 196
 197         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 198                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
 199                 if (!grp->vlan_devices_arrays[i])
 200                         goto err;
 201         }
 202
 203         grp->real_dev_ifindex = ifindex;
 204         hlist_add_head_rcu(&grp->hlist,
 205                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
 206         return grp;
 207
 208 err:
 209         vlan_group_free(grp);
 210         return NULL;
 211 }
 212
 213 static void vlan_rcu_free(struct rcu_head *rcu)
 214 {
 215         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 216 }
 217
 218
 219 /* This returns 0 if everything went fine.
 220  * It will return 1 if the group was killed as a result.
 221  * A negative return indicates failure.
 222  *
 223  * The RTNL lock must be held.
 224  */
 225 static int unregister_vlan_dev(struct net_device *real_dev,
 226                                unsigned short vlan_id)
 227 {
 228         struct net_device *dev = NULL;
 229         int real_dev_ifindex = real_dev->ifindex;
 230         struct vlan_group *grp;
 231         int i, ret;
 232
 233         /* sanity check */
 234         if (vlan_id >= VLAN_VID_MASK)
 235                 return -EINVAL;
 236
 237         ASSERT_RTNL();
 238         grp = __vlan_find_group(real_dev_ifindex);
 239
 240         ret = 0;
 241
 242         if (grp) {
 243                 dev = vlan_group_get_device(grp, vlan_id);
 244                 if (dev) {
 245                         /* Remove proc entry */
 246                         vlan_proc_rem_dev(dev);
 247
 248                         /* Take it out of our own structures, but be sure to
 249                          * interlock with HW accelerating devices or SW vlan
 250                          * input packet processing.
 251                          */
 252                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 253                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 254
 255                         vlan_group_set_device(grp, vlan_id, NULL);
 256                         synchronize_net();
 257
 258
 259                         /* Caller unregisters (and if necessary, puts)
 260                          * VLAN device, but we get rid of the reference to
 261                          * real_dev here.
 262                          */
 263                         dev_put(real_dev);
 264
 265                         /* If the group is now empty, kill off the
 266                          * group.
 267                          */
 268                         for (i = 0; i < VLAN_VID_MASK; i++)
 269                                 if (vlan_group_get_device(grp, i))
 270                                         break;
 271
 272                         if (i == VLAN_VID_MASK) {
 273                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 274                                         real_dev->vlan_rx_register(real_dev, NULL);
 275
 276                                 hlist_del_rcu(&grp->hlist);
 277
 278                                 /* Free the group, after all cpu's are done. */
 279                                 call_rcu(&grp->rcu, vlan_rcu_free);
 280
 281                                 grp = NULL;
 282                                 ret = 1;
 283                         }
 284                 }
 285         }
 286
 287         return ret;
 288 }
 289
 290 int unregister_vlan_device(struct net_device *dev)
 291 {
 292         int ret;
 293
 294         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 295                                   VLAN_DEV_INFO(dev)->vlan_id);
 296         unregister_netdevice(dev);
 297
 298         if (ret == 1)
 299                 ret = 0;
 300         return ret;
 301 }
 302
 303 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 304 {
 305         /* Have to respect userspace enforced dormant state
 306          * of real device, also must allow supplicant running
 307          * on VLAN device
 308          */
 309         if (dev->operstate == IF_OPER_DORMANT)
 310                 netif_dormant_on(vlandev);
 311         else
 312                 netif_dormant_off(vlandev);
 313
 314         if (netif_carrier_ok(dev)) {
 315                 if (!netif_carrier_ok(vlandev))
 316                         netif_carrier_on(vlandev);
 317         } else {
 318                 if (netif_carrier_ok(vlandev))
 319                         netif_carrier_off(vlandev);
 320         }
 321 }
 322
 323 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 324 {
 325         char *name = real_dev->name;
 326
 327         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 328                 pr_info("8021q: VLANs not supported on %s\n", name);
 329                 return -EOPNOTSUPP;
 330         }
 331
 332         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 333             !real_dev->vlan_rx_register) {
 334                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
 335                 return -EOPNOTSUPP;
 336         }
 337
 338         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 339             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 340                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
 341                 return -EOPNOTSUPP;
 342         }
 343
 344         /* The real device must be up and operating in order to
 345          * assosciate a VLAN device with it.
 346          */
 347         if (!(real_dev->flags & IFF_UP))
 348                 return -ENETDOWN;
 349
 350         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
 351                 return -EEXIST;
 352
 353         return 0;
 354 }
 355
 356 int register_vlan_dev(struct net_device *dev)
 357 {
 358         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 359         struct net_device *real_dev = vlan->real_dev;
 360         unsigned short vlan_id = vlan->vlan_id;
 361         struct vlan_group *grp, *ngrp = NULL;
 362         int err;
 363
 364         grp = __vlan_find_group(real_dev->ifindex);
 365         if (!grp) {
 366                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 367                 if (!grp)
 368                         return -ENOBUFS;
 369         }
 370
 371         err = register_netdevice(dev);
 372         if (err < 0)
 373                 goto out_free_group;
 374
 375         /* Account for reference in struct vlan_dev_info */
 376         dev_hold(real_dev);
 377
 378         vlan_transfer_operstate(real_dev, dev);
 379         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 380
 381         /* So, got the sucker initialized, now lets place
 382          * it into our local structure.
 383          */
 384         vlan_group_set_device(grp, vlan_id, dev);
 385         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 386                 real_dev->vlan_rx_register(real_dev, ngrp);
 387         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 388                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 389
 390         if (vlan_proc_add_dev(dev) < 0)
 391                 pr_warning("8021q: failed to add proc entry for %s\n",
 392                            dev->name);
 393         return 0;
 394
 395 out_free_group:
 396         if (ngrp)
 397                 vlan_group_free(ngrp);
 398         return err;
 399 }
 400
 401 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 402  *  Returns 0 if the device was created or a negative error code otherwise.
 403  */
 404 static int register_vlan_device(struct net_device *real_dev,
 405                                 unsigned short VLAN_ID)
 406 {
 407         struct net_device *new_dev;
 408         char name[IFNAMSIZ];
 409         int err;
 410
 411         if (VLAN_ID >= VLAN_VID_MASK)
 412                 return -ERANGE;
 413
 414         err = vlan_check_real_dev(real_dev, VLAN_ID);
 415         if (err < 0)
 416                 return err;
 417
 418         /* Gotta set up the fields for the device. */
 419         switch (vlan_name_type) {
 420         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 421                 /* name will look like:  eth1.0005 */
 422                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 423                 break;
 424         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 425                 /* Put our vlan.VID in the name.
 426                  * Name will look like:  vlan5
 427                  */
 428                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 429                 break;
 430         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 431                 /* Put our vlan.VID in the name.
 432                  * Name will look like:  eth0.5
 433                  */
 434                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 435                 break;
 436         case VLAN_NAME_TYPE_PLUS_VID:
 437                 /* Put our vlan.VID in the name.
 438                  * Name will look like:  vlan0005
 439                  */
 440         default:
 441                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 442         }
 443
 444         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 445                                vlan_setup);
 446
 447         if (new_dev == NULL)
 448                 return -ENOBUFS;
 449
 450         /* need 4 bytes for extra VLAN header info,
 451          * hope the underlying device can handle it.
 452          */
 453         new_dev->mtu = real_dev->mtu;
 454
 455         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 456         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 457         VLAN_DEV_INFO(new_dev)->dent = NULL;
 458         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 459
 460         new_dev->rtnl_link_ops = &vlan_link_ops;
 461         err = register_vlan_dev(new_dev);
 462         if (err < 0)
 463                 goto out_free_newdev;
 464
 465         return 0;
 466
 467 out_free_newdev:
 468         free_netdev(new_dev);
 469         return err;
 470 }
 471
 472 static void vlan_sync_address(struct net_device *dev,
 473                               struct net_device *vlandev)
 474 {
 475         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
 476
 477         /* May be called without an actual change */
 478         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 479                 return;
 480
 481         /* vlan address was different from the old address and is equal to
 482          * the new address */
 483         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 484             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 485                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 486
 487         /* vlan address was equal to the old address and is different from
 488          * the new address */
 489         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 490             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 491                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 492
 493         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 494 }
 495
 496 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 497 {
 498         struct net_device *dev = ptr;
 499         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 500         int i, flgs;
 501         struct net_device *vlandev;
 502
 503         if (dev->nd_net != &init_net)
 504                 return NOTIFY_DONE;
 505
 506         if (!grp)
 507                 goto out;
 508
 509         /* It is OK that we do not hold the group lock right now,
 510          * as we run under the RTNL lock.
 511          */
 512
 513         switch (event) {
 514         case NETDEV_CHANGE:
 515                 /* Propagate real device state to vlan devices */
 516                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 517                         vlandev = vlan_group_get_device(grp, i);
 518                         if (!vlandev)
 519                                 continue;
 520
 521                         vlan_transfer_operstate(dev, vlandev);
 522                 }
 523                 break;
 524
 525         case NETDEV_CHANGEADDR:
 526                 /* Adjust unicast filters on underlying device */
 527                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 528                         vlandev = vlan_group_get_device(grp, i);
 529                         if (!vlandev)
 530                                 continue;
 531
 532                         flgs = vlandev->flags;
 533                         if (!(flgs & IFF_UP))
 534                                 continue;
 535
 536                         vlan_sync_address(dev, vlandev);
 537                 }
 538                 break;
 539
 540         case NETDEV_DOWN:
 541                 /* Put all VLANs for this dev in the down state too.  */
 542                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 543                         vlandev = vlan_group_get_device(grp, i);
 544                         if (!vlandev)
 545                                 continue;
 546
 547                         flgs = vlandev->flags;
 548                         if (!(flgs & IFF_UP))
 549                                 continue;
 550
 551                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 552                 }
 553                 break;
 554
 555         case NETDEV_UP:
 556                 /* Put all VLANs for this dev in the up state too.  */
 557                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 558                         vlandev = vlan_group_get_device(grp, i);
 559                         if (!vlandev)
 560                                 continue;
 561
 562                         flgs = vlandev->flags;
 563                         if (flgs & IFF_UP)
 564                                 continue;
 565
 566                         dev_change_flags(vlandev, flgs | IFF_UP);
 567                 }
 568                 break;
 569
 570         case NETDEV_UNREGISTER:
 571                 /* Delete all VLANs for this dev. */
 572                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 573                         int ret;
 574
 575                         vlandev = vlan_group_get_device(grp, i);
 576                         if (!vlandev)
 577                                 continue;
 578
 579                         ret = unregister_vlan_dev(dev,
 580                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 581
 582                         unregister_netdevice(vlandev);
 583
 584                         /* Group was destroyed? */
 585                         if (ret == 1)
 586                                 break;
 587                 }
 588                 break;
 589         }
 590
 591 out:
 592         return NOTIFY_DONE;
 593 }
 594
 595 /*
 596  *      VLAN IOCTL handler.
 597  *      o execute requested action or pass command to the device driver
 598  *   arg is really a struct vlan_ioctl_args __user *.
 599  */
 600 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 601 {
 602         int err;
 603         unsigned short vid = 0;
 604         struct vlan_ioctl_args args;
 605         struct net_device *dev = NULL;
 606
 607         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 608                 return -EFAULT;
 609
 610         /* Null terminate this sucker, just in case. */
 611         args.device1[23] = 0;
 612         args.u.device2[23] = 0;
 613
 614         rtnl_lock();
 615
 616         switch (args.cmd) {
 617         case SET_VLAN_INGRESS_PRIORITY_CMD:
 618         case SET_VLAN_EGRESS_PRIORITY_CMD:
 619         case SET_VLAN_FLAG_CMD:
 620         case ADD_VLAN_CMD:
 621         case DEL_VLAN_CMD:
 622         case GET_VLAN_REALDEV_NAME_CMD:
 623         case GET_VLAN_VID_CMD:
 624                 err = -ENODEV;
 625                 dev = __dev_get_by_name(&init_net, args.device1);
 626                 if (!dev)
 627                         goto out;
 628
 629                 err = -EINVAL;
 630                 if (args.cmd != ADD_VLAN_CMD &&
 631                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 632                         goto out;
 633         }
 634
 635         switch (args.cmd) {
 636         case SET_VLAN_INGRESS_PRIORITY_CMD:
 637                 err = -EPERM;
 638                 if (!capable(CAP_NET_ADMIN))
 639                         break;
 640                 vlan_dev_set_ingress_priority(dev,
 641                                               args.u.skb_priority,
 642                                               args.vlan_qos);
 643                 err = 0;
 644                 break;
 645
 646         case SET_VLAN_EGRESS_PRIORITY_CMD:
 647                 err = -EPERM;
 648                 if (!capable(CAP_NET_ADMIN))
 649                         break;
 650                 err = vlan_dev_set_egress_priority(dev,
 651                                                    args.u.skb_priority,
 652                                                    args.vlan_qos);
 653                 break;
 654
 655         case SET_VLAN_FLAG_CMD:
 656                 err = -EPERM;
 657                 if (!capable(CAP_NET_ADMIN))
 658                         break;
 659                 err = vlan_dev_set_vlan_flag(dev,
 660                                              args.u.flag,
 661                                              args.vlan_qos);
 662                 break;
 663
 664         case SET_VLAN_NAME_TYPE_CMD:
 665                 err = -EPERM;
 666                 if (!capable(CAP_NET_ADMIN))
 667                         break;
 668                 if ((args.u.name_type >= 0) &&
 669                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 670                         vlan_name_type = args.u.name_type;
 671                         err = 0;
 672                 } else {
 673                         err = -EINVAL;
 674                 }
 675                 break;
 676
 677         case ADD_VLAN_CMD:
 678                 err = -EPERM;
 679                 if (!capable(CAP_NET_ADMIN))
 680                         break;
 681                 err = register_vlan_device(dev, args.u.VID);
 682                 break;
 683
 684         case DEL_VLAN_CMD:
 685                 err = -EPERM;
 686                 if (!capable(CAP_NET_ADMIN))
 687                         break;
 688                 err = unregister_vlan_device(dev);
 689                 break;
 690
 691         case GET_VLAN_REALDEV_NAME_CMD:
 692                 err = 0;
 693                 vlan_dev_get_realdev_name(dev, args.u.device2);
 694                 if (copy_to_user(arg, &args,
 695                                  sizeof(struct vlan_ioctl_args))) {
 696                         err = -EFAULT;
 697                 }
 698                 break;
 699
 700         case GET_VLAN_VID_CMD:
 701                 err = 0;
 702                 vlan_dev_get_vid(dev, &vid);
 703                 args.u.VID = vid;
 704                 if (copy_to_user(arg, &args,
 705                                  sizeof(struct vlan_ioctl_args))) {
 706                       err = -EFAULT;
 707                 }
 708                 break;
 709
 710         default:
 711                 err = -EOPNOTSUPP;
 712                 break;
 713         }
 714 out:
 715         rtnl_unlock();
 716         return err;
 717 }
 718
 719 MODULE_LICENSE("GPL");
 720 MODULE_VERSION(DRV_VERSION);