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 /*
 364  * vlan network devices have devices nesting below it, and are a special
 365  * "super class" of normal network devices; split their locks off into a
 366  * separate class since they always nest.
 367  */
 368 static struct lock_class_key vlan_netdev_xmit_lock_key;
 369
 370
 371 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 372  *  Returns the device that was created, or NULL if there was
 373  *  an error of some kind.
 374  */
 375 static struct net_device *register_vlan_device(const char *eth_IF_name,
 376                                                unsigned short VLAN_ID)
 377 {
 378         struct vlan_group *grp;
 379         struct net_device *new_dev;
 380         struct net_device *real_dev; /* the ethernet device */
 381         char name[IFNAMSIZ];
 382
 383 #ifdef VLAN_DEBUG
 384         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 385                 __FUNCTION__, eth_IF_name, VLAN_ID);
 386 #endif
 387
 388         if (VLAN_ID >= VLAN_VID_MASK)
 389                 goto out_ret_null;
 390
 391         /* find the device relating to eth_IF_name. */
 392         real_dev = dev_get_by_name(eth_IF_name);
 393         if (!real_dev)
 394                 goto out_ret_null;
 395
 396         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 397                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 398                         __FUNCTION__, real_dev->name);
 399                 goto out_put_dev;
 400         }
 401
 402         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 403             (real_dev->vlan_rx_register == 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         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 411             (real_dev->vlan_rx_add_vid == NULL ||
 412              real_dev->vlan_rx_kill_vid == NULL)) {
 413                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 414                         __FUNCTION__, real_dev->name);
 415                 goto out_put_dev;
 416         }
 417
 418         /* From this point on, all the data structures must remain
 419          * consistent.
 420          */
 421         rtnl_lock();
 422
 423         /* The real device must be up and operating in order to
 424          * assosciate a VLAN device with it.
 425          */
 426         if (!(real_dev->flags & IFF_UP))
 427                 goto out_unlock;
 428
 429         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 430                 /* was already registered. */
 431                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 432                 goto out_unlock;
 433         }
 434
 435         /* Gotta set up the fields for the device. */
 436 #ifdef VLAN_DEBUG
 437         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 438                vlan_name_type);
 439 #endif
 440         switch (vlan_name_type) {
 441         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 442                 /* name will look like:  eth1.0005 */
 443                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 444                 break;
 445         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 446                 /* Put our vlan.VID in the name.
 447                  * Name will look like:  vlan5
 448                  */
 449                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 450                 break;
 451         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 452                 /* Put our vlan.VID in the name.
 453                  * Name will look like:  eth0.5
 454                  */
 455                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 456                 break;
 457         case VLAN_NAME_TYPE_PLUS_VID:
 458                 /* Put our vlan.VID in the name.
 459                  * Name will look like:  vlan0005
 460                  */
 461         default:
 462                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 463         };
 464
 465         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 466                                vlan_setup);
 467
 468         if (new_dev == NULL)
 469                 goto out_unlock;
 470
 471 #ifdef VLAN_DEBUG
 472         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 473 #endif
 474         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 475         new_dev->flags = real_dev->flags;
 476         new_dev->flags &= ~IFF_UP;
 477
 478         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 479                                              (1<<__LINK_STATE_DORMANT))) |
 480                          (1<<__LINK_STATE_PRESENT);
 481
 482         /* need 4 bytes for extra VLAN header info,
 483          * hope the underlying device can handle it.
 484          */
 485         new_dev->mtu = real_dev->mtu;
 486
 487         /* TODO: maybe just assign it to be ETHERNET? */
 488         new_dev->type = real_dev->type;
 489
 490         new_dev->hard_header_len = real_dev->hard_header_len;
 491         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 492                 /* Regular ethernet + 4 bytes (18 total). */
 493                 new_dev->hard_header_len += VLAN_HLEN;
 494         }
 495
 496         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 497                      new_dev->priv,
 498                      sizeof(struct vlan_dev_info));
 499
 500         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 501         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 502         new_dev->addr_len = real_dev->addr_len;
 503
 504         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 505                 new_dev->hard_header = real_dev->hard_header;
 506                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 507                 new_dev->rebuild_header = real_dev->rebuild_header;
 508         } else {
 509                 new_dev->hard_header = vlan_dev_hard_header;
 510                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 511                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 512         }
 513         new_dev->hard_header_parse = real_dev->hard_header_parse;
 514
 515         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 516         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 517         VLAN_DEV_INFO(new_dev)->dent = NULL;
 518         VLAN_DEV_INFO(new_dev)->flags = 1;
 519
 520 #ifdef VLAN_DEBUG
 521         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 522                real_dev->ifindex);
 523 #endif
 524
 525         if (register_netdevice(new_dev))
 526                 goto out_free_newdev;
 527
 528         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 529
 530         new_dev->iflink = real_dev->ifindex;
 531         vlan_transfer_operstate(real_dev, new_dev);
 532         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
 533
 534         /* So, got the sucker initialized, now lets place
 535          * it into our local structure.
 536          */
 537         grp = __vlan_find_group(real_dev->ifindex);
 538
 539         /* Note, we are running under the RTNL semaphore
 540          * so it cannot "appear" on us.
 541          */
 542         if (!grp) { /* need to add a new group */
 543                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 544                 if (!grp)
 545                         goto out_free_unregister;
 546
 547                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 548                 grp->real_dev_ifindex = real_dev->ifindex;
 549
 550                 hlist_add_head_rcu(&grp->hlist,
 551                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 552
 553                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 554                         real_dev->vlan_rx_register(real_dev, grp);
 555         }
 556
 557         grp->vlan_devices[VLAN_ID] = new_dev;
 558
 559         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 560                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 561                                                          new_dev->name);
 562
 563         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 564                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 565
 566         rtnl_unlock();
 567
 568
 569 #ifdef VLAN_DEBUG
 570         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 571 #endif
 572         return new_dev;
 573
 574 out_free_unregister:
 575         unregister_netdev(new_dev);
 576         goto out_unlock;
 577
 578 out_free_newdev:
 579         free_netdev(new_dev);
 580
 581 out_unlock:
 582         rtnl_unlock();
 583
 584 out_put_dev:
 585         dev_put(real_dev);
 586
 587 out_ret_null:
 588         return NULL;
 589 }
 590
 591 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 592 {
 593         struct net_device *dev = ptr;
 594         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 595         int i, flgs;
 596         struct net_device *vlandev;
 597
 598         if (!grp)
 599                 goto out;
 600
 601         /* It is OK that we do not hold the group lock right now,
 602          * as we run under the RTNL lock.
 603          */
 604
 605         switch (event) {
 606         case NETDEV_CHANGE:
 607                 /* Propagate real device state to vlan devices */
 608                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 609                         vlandev = grp->vlan_devices[i];
 610                         if (!vlandev)
 611                                 continue;
 612
 613                         vlan_transfer_operstate(dev, vlandev);
 614                 }
 615                 break;
 616
 617         case NETDEV_DOWN:
 618                 /* Put all VLANs for this dev in the down state too.  */
 619                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 620                         vlandev = grp->vlan_devices[i];
 621                         if (!vlandev)
 622                                 continue;
 623
 624                         flgs = vlandev->flags;
 625                         if (!(flgs & IFF_UP))
 626                                 continue;
 627
 628                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 629                 }
 630                 break;
 631
 632         case NETDEV_UP:
 633                 /* Put all VLANs for this dev in the up state too.  */
 634                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 635                         vlandev = grp->vlan_devices[i];
 636                         if (!vlandev)
 637                                 continue;
 638
 639                         flgs = vlandev->flags;
 640                         if (flgs & IFF_UP)
 641                                 continue;
 642
 643                         dev_change_flags(vlandev, flgs | IFF_UP);
 644                 }
 645                 break;
 646
 647         case NETDEV_UNREGISTER:
 648                 /* Delete all VLANs for this dev. */
 649                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 650                         int ret;
 651
 652                         vlandev = grp->vlan_devices[i];
 653                         if (!vlandev)
 654                                 continue;
 655
 656                         ret = unregister_vlan_dev(dev,
 657                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 658
 659                         unregister_netdevice(vlandev);
 660
 661                         /* Group was destroyed? */
 662                         if (ret == 1)
 663                                 break;
 664                 }
 665                 break;
 666         };
 667
 668 out:
 669         return NOTIFY_DONE;
 670 }
 671
 672 /*
 673  *      VLAN IOCTL handler.
 674  *      o execute requested action or pass command to the device driver
 675  *   arg is really a struct vlan_ioctl_args __user *.
 676  */
 677 static int vlan_ioctl_handler(void __user *arg)
 678 {
 679         int err = 0;
 680         unsigned short vid = 0;
 681         struct vlan_ioctl_args args;
 682
 683         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 684                 return -EFAULT;
 685
 686         /* Null terminate this sucker, just in case. */
 687         args.device1[23] = 0;
 688         args.u.device2[23] = 0;
 689
 690 #ifdef VLAN_DEBUG
 691         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 692 #endif
 693
 694         switch (args.cmd) {
 695         case SET_VLAN_INGRESS_PRIORITY_CMD:
 696                 if (!capable(CAP_NET_ADMIN))
 697                         return -EPERM;
 698                 err = vlan_dev_set_ingress_priority(args.device1,
 699                                                     args.u.skb_priority,
 700                                                     args.vlan_qos);
 701                 break;
 702
 703         case SET_VLAN_EGRESS_PRIORITY_CMD:
 704                 if (!capable(CAP_NET_ADMIN))
 705                         return -EPERM;
 706                 err = vlan_dev_set_egress_priority(args.device1,
 707                                                    args.u.skb_priority,
 708                                                    args.vlan_qos);
 709                 break;
 710
 711         case SET_VLAN_FLAG_CMD:
 712                 if (!capable(CAP_NET_ADMIN))
 713                         return -EPERM;
 714                 err = vlan_dev_set_vlan_flag(args.device1,
 715                                              args.u.flag,
 716                                              args.vlan_qos);
 717                 break;
 718
 719         case SET_VLAN_NAME_TYPE_CMD:
 720                 if (!capable(CAP_NET_ADMIN))
 721                         return -EPERM;
 722                 if ((args.u.name_type >= 0) &&
 723                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 724                         vlan_name_type = args.u.name_type;
 725                         err = 0;
 726                 } else {
 727                         err = -EINVAL;
 728                 }
 729                 break;
 730
 731         case ADD_VLAN_CMD:
 732                 if (!capable(CAP_NET_ADMIN))
 733                         return -EPERM;
 734                 /* we have been given the name of the Ethernet Device we want to
 735                  * talk to:  args.dev1   We also have the
 736                  * VLAN ID:  args.u.VID
 737                  */
 738                 if (register_vlan_device(args.device1, args.u.VID)) {
 739                         err = 0;
 740                 } else {
 741                         err = -EINVAL;
 742                 }
 743                 break;
 744
 745         case DEL_VLAN_CMD:
 746                 if (!capable(CAP_NET_ADMIN))
 747                         return -EPERM;
 748                 /* Here, the args.dev1 is the actual VLAN we want
 749                  * to get rid of.
 750                  */
 751                 err = unregister_vlan_device(args.device1);
 752                 break;
 753
 754         case GET_VLAN_INGRESS_PRIORITY_CMD:
 755                 /* TODO:  Implement
 756                    err = vlan_dev_get_ingress_priority(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_EGRESS_PRIORITY_CMD:
 765                 /* TODO:  Implement
 766                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 767                    if (copy_to_user((void*)arg, &args,
 768                         sizeof(struct vlan_ioctl_args))) {
 769                         err = -EFAULT;
 770                    }
 771                 */
 772                 err = -EINVAL;
 773                 break;
 774         case GET_VLAN_REALDEV_NAME_CMD:
 775                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
 776                 if (err)
 777                         goto out;
 778                 if (copy_to_user(arg, &args,
 779                                  sizeof(struct vlan_ioctl_args))) {
 780                         err = -EFAULT;
 781                 }
 782                 break;
 783
 784         case GET_VLAN_VID_CMD:
 785                 err = vlan_dev_get_vid(args.device1, &vid);
 786                 if (err)
 787                         goto out;
 788                 args.u.VID = vid;
 789                 if (copy_to_user(arg, &args,
 790                                  sizeof(struct vlan_ioctl_args))) {
 791                       err = -EFAULT;
 792                 }
 793                 break;
 794
 795         default:
 796                 /* pass on to underlying device instead?? */
 797                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 798                         __FUNCTION__, args.cmd);
 799                 return -EINVAL;
 800         };
 801 out:
 802         return err;
 803 }
 804
 805 MODULE_LICENSE("GPL");
 806 MODULE_VERSION(DRV_VERSION);