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
  35 #include <linux/if_vlan.h>
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38
  39 #define DRV_VERSION "1.8"
  40
  41 /* Global VLAN variables */
  42
  43 /* Our listing of VLAN group(s) */
  44 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  45 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  46
  47 static char vlan_fullname[] = "802.1Q VLAN Support";
  48 static char vlan_version[] = DRV_VERSION;
  49 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  50 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  51
  52 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  53 static int vlan_ioctl_handler(void __user *);
  54 static int unregister_vlan_dev(struct net_device *, unsigned short );
  55
  56 static struct notifier_block vlan_notifier_block = {
  57         .notifier_call = vlan_device_event,
  58 };
  59
  60 /* These may be changed at run-time through IOCTLs */
  61
  62 /* Determines interface naming scheme. */
  63 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  64
  65 static struct packet_type vlan_packet_type = {
  66         .type = __constant_htons(ETH_P_8021Q),
  67         .func = vlan_skb_recv, /* VLAN receive method */
  68 };
  69
  70 /* End of global variables definitions. */
  71
  72 /*
  73  * Function vlan_proto_init (pro)
  74  *
  75  *    Initialize VLAN protocol layer,
  76  *
  77  */
  78 static int __init vlan_proto_init(void)
  79 {
  80         int err;
  81
  82         printk(VLAN_INF "%s v%s %s\n",
  83                vlan_fullname, vlan_version, vlan_copyright);
  84         printk(VLAN_INF "All bugs added by %s\n",
  85                vlan_buggyright);
  86
  87         /* proc file system initialization */
  88         err = vlan_proc_init();
  89         if (err < 0) {
  90                 printk(KERN_ERR
  91                        "%s %s: can't create entry in proc filesystem!\n",
  92                        __FUNCTION__, VLAN_NAME);
  93                 return err;
  94         }
  95
  96         dev_add_pack(&vlan_packet_type);
  97
  98         /* Register us to receive netdevice events */
  99         err = register_netdevice_notifier(&vlan_notifier_block);
 100         if (err < 0) {
 101                 dev_remove_pack(&vlan_packet_type);
 102                 vlan_proc_cleanup();
 103                 return err;
 104         }
 105
 106         vlan_ioctl_set(vlan_ioctl_handler);
 107
 108         return 0;
 109 }
 110
 111 /* Cleanup all vlan devices
 112  * Note: devices that have been registered that but not
 113  * brought up will exist but have no module ref count.
 114  */
 115 static void __exit vlan_cleanup_devices(void)
 116 {
 117         struct net_device *dev, *nxt;
 118
 119         rtnl_lock();
 120         for (dev = dev_base; dev; dev = nxt) {
 121                 nxt = dev->next;
 122                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 123                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 124                                             VLAN_DEV_INFO(dev)->vlan_id);
 125
 126                         unregister_netdevice(dev);
 127                 }
 128         }
 129         rtnl_unlock();
 130 }
 131
 132 /*
 133  *     Module 'remove' entry point.
 134  *     o delete /proc/net/router directory and static entries.
 135  */
 136 static void __exit vlan_cleanup_module(void)
 137 {
 138         int i;
 139
 140         vlan_ioctl_set(NULL);
 141
 142         /* Un-register us from receiving netdevice events */
 143         unregister_netdevice_notifier(&vlan_notifier_block);
 144
 145         dev_remove_pack(&vlan_packet_type);
 146         vlan_cleanup_devices();
 147
 148         /* This table must be empty if there are no module
 149          * references left.
 150          */
 151         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 152                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 153         }
 154         vlan_proc_cleanup();
 155
 156         synchronize_net();
 157 }
 158
 159 module_init(vlan_proto_init);
 160 module_exit(vlan_cleanup_module);
 161
 162 /* Must be invoked with RCU read lock (no preempt) */
 163 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 164 {
 165         struct vlan_group *grp;
 166         struct hlist_node *n;
 167         int hash = vlan_grp_hashfn(real_dev_ifindex);
 168
 169         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 170                 if (grp->real_dev_ifindex == real_dev_ifindex)
 171                         return grp;
 172         }
 173
 174         return NULL;
 175 }
 176
 177 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 178  *
 179  * Must be invoked with RCU read lock (no preempt)
 180  */
 181 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 182                                    unsigned short VID)
 183 {
 184         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 185
 186         if (grp)
 187                 return grp->vlan_devices[VID];
 188
 189         return NULL;
 190 }
 191
 192 static void vlan_rcu_free(struct rcu_head *rcu)
 193 {
 194         kfree(container_of(rcu, struct vlan_group, rcu));
 195 }
 196
 197
 198 /* This returns 0 if everything went fine.
 199  * It will return 1 if the group was killed as a result.
 200  * A negative return indicates failure.
 201  *
 202  * The RTNL lock must be held.
 203  */
 204 static int unregister_vlan_dev(struct net_device *real_dev,
 205                                unsigned short vlan_id)
 206 {
 207         struct net_device *dev = NULL;
 208         int real_dev_ifindex = real_dev->ifindex;
 209         struct vlan_group *grp;
 210         int i, ret;
 211
 212 #ifdef VLAN_DEBUG
 213         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 214 #endif
 215
 216         /* sanity check */
 217         if (vlan_id >= VLAN_VID_MASK)
 218                 return -EINVAL;
 219
 220         ASSERT_RTNL();
 221         grp = __vlan_find_group(real_dev_ifindex);
 222
 223         ret = 0;
 224
 225         if (grp) {
 226                 dev = grp->vlan_devices[vlan_id];
 227                 if (dev) {
 228                         /* Remove proc entry */
 229                         vlan_proc_rem_dev(dev);
 230
 231                         /* Take it out of our own structures, but be sure to
 232                          * interlock with HW accelerating devices or SW vlan
 233                          * input packet processing.
 234                          */
 235                         if (real_dev->features &
 236                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
 237                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 238                         }
 239
 240                         grp->vlan_devices[vlan_id] = NULL;
 241                         synchronize_net();
 242
 243
 244                         /* Caller unregisters (and if necessary, puts)
 245                          * VLAN device, but we get rid of the reference to
 246                          * real_dev here.
 247                          */
 248                         dev_put(real_dev);
 249
 250                         /* If the group is now empty, kill off the
 251                          * group.
 252                          */
 253                         for (i = 0; i < VLAN_VID_MASK; i++)
 254                                 if (grp->vlan_devices[i])
 255                                         break;
 256
 257                         if (i == VLAN_VID_MASK) {
 258                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 259                                         real_dev->vlan_rx_register(real_dev, NULL);
 260
 261                                 hlist_del_rcu(&grp->hlist);
 262
 263                                 /* Free the group, after all cpu's are done. */
 264                                 call_rcu(&grp->rcu, vlan_rcu_free);
 265
 266                                 grp = NULL;
 267                                 ret = 1;
 268                         }
 269                 }
 270         }
 271
 272         return ret;
 273 }
 274
 275 static int unregister_vlan_device(const char *vlan_IF_name)
 276 {
 277         struct net_device *dev = NULL;
 278         int ret;
 279
 280
 281         dev = dev_get_by_name(vlan_IF_name);
 282         ret = -EINVAL;
 283         if (dev) {
 284                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 285                         rtnl_lock();
 286
 287                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 288                                                   VLAN_DEV_INFO(dev)->vlan_id);
 289
 290                         dev_put(dev);
 291                         unregister_netdevice(dev);
 292
 293                         rtnl_unlock();
 294
 295                         if (ret == 1)
 296                                 ret = 0;
 297                 } else {
 298                         printk(VLAN_ERR
 299                                "%s: ERROR:      Tried to remove a non-vlan device "
 300                                "with VLAN code, name: %s  priv_flags: %hX\n",
 301                                __FUNCTION__, dev->name, dev->priv_flags);
 302                         dev_put(dev);
 303                         ret = -EPERM;
 304                 }
 305         } else {
 306 #ifdef VLAN_DEBUG
 307                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
 308 #endif
 309                 ret = -EINVAL;
 310         }
 311
 312         return ret;
 313 }
 314
 315 static void vlan_setup(struct net_device *new_dev)
 316 {
 317         SET_MODULE_OWNER(new_dev);
 318
 319         /* new_dev->ifindex = 0;  it will be set when added to
 320          * the global list.
 321          * iflink is set as well.
 322          */
 323         new_dev->get_stats = vlan_dev_get_stats;
 324
 325         /* Make this thing known as a VLAN device */
 326         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 327
 328         /* Set us up to have no queue, as the underlying Hardware device
 329          * can do all the queueing we could want.
 330          */
 331         new_dev->tx_queue_len = 0;
 332
 333         /* set up method calls */
 334         new_dev->change_mtu = vlan_dev_change_mtu;
 335         new_dev->open = vlan_dev_open;
 336         new_dev->stop = vlan_dev_stop;
 337         new_dev->set_mac_address = vlan_dev_set_mac_address;
 338         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 339         new_dev->destructor = free_netdev;
 340         new_dev->do_ioctl = vlan_dev_ioctl;
 341 }
 342
 343 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 344 {
 345         /* Have to respect userspace enforced dormant state
 346          * of real device, also must allow supplicant running
 347          * on VLAN device
 348          */
 349         if (dev->operstate == IF_OPER_DORMANT)
 350                 netif_dormant_on(vlandev);
 351         else
 352                 netif_dormant_off(vlandev);
 353
 354         if (netif_carrier_ok(dev)) {
 355                 if (!netif_carrier_ok(vlandev))
 356                         netif_carrier_on(vlandev);
 357         } else {
 358                 if (netif_carrier_ok(vlandev))
 359                         netif_carrier_off(vlandev);
 360         }
 361 }
 362
 363 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 364  *  Returns the device that was created, or NULL if there was
 365  *  an error of some kind.
 366  */
 367 static struct net_device *register_vlan_device(const char *eth_IF_name,
 368                                                unsigned short VLAN_ID)
 369 {
 370         struct vlan_group *grp;
 371         struct net_device *new_dev;
 372         struct net_device *real_dev; /* the ethernet device */
 373         char name[IFNAMSIZ];
 374
 375 #ifdef VLAN_DEBUG
 376         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 377                 __FUNCTION__, eth_IF_name, VLAN_ID);
 378 #endif
 379
 380         if (VLAN_ID >= VLAN_VID_MASK)
 381                 goto out_ret_null;
 382
 383         /* find the device relating to eth_IF_name. */
 384         real_dev = dev_get_by_name(eth_IF_name);
 385         if (!real_dev)
 386                 goto out_ret_null;
 387
 388         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 389                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 390                         __FUNCTION__, real_dev->name);
 391                 goto out_put_dev;
 392         }
 393
 394         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 395             (real_dev->vlan_rx_register == NULL ||
 396              real_dev->vlan_rx_kill_vid == NULL)) {
 397                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 398                         __FUNCTION__, real_dev->name);
 399                 goto out_put_dev;
 400         }
 401
 402         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 403             (real_dev->vlan_rx_add_vid == NULL ||
 404              real_dev->vlan_rx_kill_vid == NULL)) {
 405                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 406                         __FUNCTION__, real_dev->name);
 407                 goto out_put_dev;
 408         }
 409
 410         /* From this point on, all the data structures must remain
 411          * consistent.
 412          */
 413         rtnl_lock();
 414
 415         /* The real device must be up and operating in order to
 416          * assosciate a VLAN device with it.
 417          */
 418         if (!(real_dev->flags & IFF_UP))
 419                 goto out_unlock;
 420
 421         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 422                 /* was already registered. */
 423                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 424                 goto out_unlock;
 425         }
 426
 427         /* Gotta set up the fields for the device. */
 428 #ifdef VLAN_DEBUG
 429         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 430                vlan_name_type);
 431 #endif
 432         switch (vlan_name_type) {
 433         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 434                 /* name will look like:  eth1.0005 */
 435                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 436                 break;
 437         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 438                 /* Put our vlan.VID in the name.
 439                  * Name will look like:  vlan5
 440                  */
 441                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 442                 break;
 443         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 444                 /* Put our vlan.VID in the name.
 445                  * Name will look like:  eth0.5
 446                  */
 447                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 448                 break;
 449         case VLAN_NAME_TYPE_PLUS_VID:
 450                 /* Put our vlan.VID in the name.
 451                  * Name will look like:  vlan0005
 452                  */
 453         default:
 454                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 455         };
 456
 457         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 458                                vlan_setup);
 459         if (new_dev == NULL)
 460                 goto out_unlock;
 461
 462 #ifdef VLAN_DEBUG
 463         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 464 #endif
 465         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 466         new_dev->flags = real_dev->flags;
 467         new_dev->flags &= ~IFF_UP;
 468
 469         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 470                                              (1<<__LINK_STATE_DORMANT))) |
 471                          (1<<__LINK_STATE_PRESENT);
 472
 473         /* need 4 bytes for extra VLAN header info,
 474          * hope the underlying device can handle it.
 475          */
 476         new_dev->mtu = real_dev->mtu;
 477
 478         /* TODO: maybe just assign it to be ETHERNET? */
 479         new_dev->type = real_dev->type;
 480
 481         new_dev->hard_header_len = real_dev->hard_header_len;
 482         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 483                 /* Regular ethernet + 4 bytes (18 total). */
 484                 new_dev->hard_header_len += VLAN_HLEN;
 485         }
 486
 487         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 488                      new_dev->priv,
 489                      sizeof(struct vlan_dev_info));
 490
 491         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 492         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 493         new_dev->addr_len = real_dev->addr_len;
 494
 495         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 496                 new_dev->hard_header = real_dev->hard_header;
 497                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 498                 new_dev->rebuild_header = real_dev->rebuild_header;
 499         } else {
 500                 new_dev->hard_header = vlan_dev_hard_header;
 501                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 502                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 503         }
 504         new_dev->hard_header_parse = real_dev->hard_header_parse;
 505
 506         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 507         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 508         VLAN_DEV_INFO(new_dev)->dent = NULL;
 509         VLAN_DEV_INFO(new_dev)->flags = 1;
 510
 511 #ifdef VLAN_DEBUG
 512         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 513                real_dev->ifindex);
 514 #endif
 515
 516         if (register_netdevice(new_dev))
 517                 goto out_free_newdev;
 518
 519         new_dev->iflink = real_dev->ifindex;
 520         vlan_transfer_operstate(real_dev, new_dev);
 521         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
 522
 523         /* So, got the sucker initialized, now lets place
 524          * it into our local structure.
 525          */
 526         grp = __vlan_find_group(real_dev->ifindex);
 527
 528         /* Note, we are running under the RTNL semaphore
 529          * so it cannot "appear" on us.
 530          */
 531         if (!grp) { /* need to add a new group */
 532                 grp = kmalloc(sizeof(struct vlan_group), GFP_KERNEL);
 533                 if (!grp)
 534                         goto out_free_unregister;
 535
 536                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 537                 memset(grp, 0, sizeof(struct vlan_group));
 538                 grp->real_dev_ifindex = real_dev->ifindex;
 539
 540                 hlist_add_head_rcu(&grp->hlist,
 541                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 542
 543                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 544                         real_dev->vlan_rx_register(real_dev, grp);
 545         }
 546
 547         grp->vlan_devices[VLAN_ID] = new_dev;
 548
 549         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 550                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 551                                                          new_dev->name);
 552
 553         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 554                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 555
 556         rtnl_unlock();
 557
 558
 559 #ifdef VLAN_DEBUG
 560         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 561 #endif
 562         return new_dev;
 563
 564 out_free_unregister:
 565         unregister_netdev(new_dev);
 566         goto out_unlock;
 567
 568 out_free_newdev:
 569         free_netdev(new_dev);
 570
 571 out_unlock:
 572         rtnl_unlock();
 573
 574 out_put_dev:
 575         dev_put(real_dev);
 576
 577 out_ret_null:
 578         return NULL;
 579 }
 580
 581 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 582 {
 583         struct net_device *dev = ptr;
 584         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 585         int i, flgs;
 586         struct net_device *vlandev;
 587
 588         if (!grp)
 589                 goto out;
 590
 591         /* It is OK that we do not hold the group lock right now,
 592          * as we run under the RTNL lock.
 593          */
 594
 595         switch (event) {
 596         case NETDEV_CHANGE:
 597                 /* Propagate real device state to vlan devices */
 598                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 599                         vlandev = grp->vlan_devices[i];
 600                         if (!vlandev)
 601                                 continue;
 602
 603                         vlan_transfer_operstate(dev, vlandev);
 604                 }
 605                 break;
 606
 607         case NETDEV_DOWN:
 608                 /* Put all VLANs for this dev in the down state too.  */
 609                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 610                         vlandev = grp->vlan_devices[i];
 611                         if (!vlandev)
 612                                 continue;
 613
 614                         flgs = vlandev->flags;
 615                         if (!(flgs & IFF_UP))
 616                                 continue;
 617
 618                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 619                 }
 620                 break;
 621
 622         case NETDEV_UP:
 623                 /* Put all VLANs for this dev in the up state too.  */
 624                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 625                         vlandev = grp->vlan_devices[i];
 626                         if (!vlandev)
 627                                 continue;
 628
 629                         flgs = vlandev->flags;
 630                         if (flgs & IFF_UP)
 631                                 continue;
 632
 633                         dev_change_flags(vlandev, flgs | IFF_UP);
 634                 }
 635                 break;
 636
 637         case NETDEV_UNREGISTER:
 638                 /* Delete all VLANs for this dev. */
 639                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 640                         int ret;
 641
 642                         vlandev = grp->vlan_devices[i];
 643                         if (!vlandev)
 644                                 continue;
 645
 646                         ret = unregister_vlan_dev(dev,
 647                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 648
 649                         unregister_netdevice(vlandev);
 650
 651                         /* Group was destroyed? */
 652                         if (ret == 1)
 653                                 break;
 654                 }
 655                 break;
 656         };
 657
 658 out:
 659         return NOTIFY_DONE;
 660 }
 661
 662 /*
 663  *      VLAN IOCTL handler.
 664  *      o execute requested action or pass command to the device driver
 665  *   arg is really a struct vlan_ioctl_args __user *.
 666  */
 667 static int vlan_ioctl_handler(void __user *arg)
 668 {
 669         int err = 0;
 670         unsigned short vid = 0;
 671         struct vlan_ioctl_args args;
 672
 673         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 674                 return -EFAULT;
 675
 676         /* Null terminate this sucker, just in case. */
 677         args.device1[23] = 0;
 678         args.u.device2[23] = 0;
 679
 680 #ifdef VLAN_DEBUG
 681         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 682 #endif
 683
 684         switch (args.cmd) {
 685         case SET_VLAN_INGRESS_PRIORITY_CMD:
 686                 if (!capable(CAP_NET_ADMIN))
 687                         return -EPERM;
 688                 err = vlan_dev_set_ingress_priority(args.device1,
 689                                                     args.u.skb_priority,
 690                                                     args.vlan_qos);
 691                 break;
 692
 693         case SET_VLAN_EGRESS_PRIORITY_CMD:
 694                 if (!capable(CAP_NET_ADMIN))
 695                         return -EPERM;
 696                 err = vlan_dev_set_egress_priority(args.device1,
 697                                                    args.u.skb_priority,
 698                                                    args.vlan_qos);
 699                 break;
 700
 701         case SET_VLAN_FLAG_CMD:
 702                 if (!capable(CAP_NET_ADMIN))
 703                         return -EPERM;
 704                 err = vlan_dev_set_vlan_flag(args.device1,
 705                                              args.u.flag,
 706                                              args.vlan_qos);
 707                 break;
 708
 709         case SET_VLAN_NAME_TYPE_CMD:
 710                 if (!capable(CAP_NET_ADMIN))
 711                         return -EPERM;
 712                 if ((args.u.name_type >= 0) &&
 713                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 714                         vlan_name_type = args.u.name_type;
 715                         err = 0;
 716                 } else {
 717                         err = -EINVAL;
 718                 }
 719                 break;
 720
 721         case ADD_VLAN_CMD:
 722                 if (!capable(CAP_NET_ADMIN))
 723                         return -EPERM;
 724                 /* we have been given the name of the Ethernet Device we want to
 725                  * talk to:  args.dev1   We also have the
 726                  * VLAN ID:  args.u.VID
 727                  */
 728                 if (register_vlan_device(args.device1, args.u.VID)) {
 729                         err = 0;
 730                 } else {
 731                         err = -EINVAL;
 732                 }
 733                 break;
 734
 735         case DEL_VLAN_CMD:
 736                 if (!capable(CAP_NET_ADMIN))
 737                         return -EPERM;
 738                 /* Here, the args.dev1 is the actual VLAN we want
 739                  * to get rid of.
 740                  */
 741                 err = unregister_vlan_device(args.device1);
 742                 break;
 743
 744         case GET_VLAN_INGRESS_PRIORITY_CMD:
 745                 /* TODO:  Implement
 746                    err = vlan_dev_get_ingress_priority(args);
 747                    if (copy_to_user((void*)arg, &args,
 748                         sizeof(struct vlan_ioctl_args))) {
 749                         err = -EFAULT;
 750                    }
 751                 */
 752                 err = -EINVAL;
 753                 break;
 754         case GET_VLAN_EGRESS_PRIORITY_CMD:
 755                 /* TODO:  Implement
 756                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 757                    if (copy_to_user((void*)arg, &args,
 758                         sizeof(struct vlan_ioctl_args))) {
 759                         err = -EFAULT;
 760                    }
 761                 */
 762                 err = -EINVAL;
 763                 break;
 764         case GET_VLAN_REALDEV_NAME_CMD:
 765                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
 766                 if (err)
 767                         goto out;
 768                 if (copy_to_user(arg, &args,
 769                                  sizeof(struct vlan_ioctl_args))) {
 770                         err = -EFAULT;
 771                 }
 772                 break;
 773
 774         case GET_VLAN_VID_CMD:
 775                 err = vlan_dev_get_vid(args.device1, &vid);
 776                 if (err)
 777                         goto out;
 778                 args.u.VID = vid;
 779                 if (copy_to_user(arg, &args,
 780                                  sizeof(struct vlan_ioctl_args))) {
 781                       err = -EFAULT;
 782                 }
 783                 break;
 784
 785         default:
 786                 /* pass on to underlying device instead?? */
 787                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 788                         __FUNCTION__, args.cmd);
 789                 return -EINVAL;
 790         };
 791 out:
 792         return err;
 793 }
 794
 795 MODULE_LICENSE("GPL");
 796 MODULE_VERSION(DRV_VERSION);