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