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/module.h>
  23 #include <linux/netdevice.h>
  24 #include <linux/skbuff.h>
  25 #include <net/datalink.h>
  26 #include <linux/mm.h>
  27 #include <linux/in.h>
  28 #include <linux/init.h>
  29 #include <net/p8022.h>
  30 #include <net/arp.h>
  31 #include <linux/rtnetlink.h>
  32 #include <linux/notifier.h>
  33
  34 #include <linux/if_vlan.h>
  35 #include "vlan.h"
  36 #include "vlanproc.h"
  37
  38 #define DRV_VERSION "1.8"
  39
  40 /* Global VLAN variables */
  41
  42 /* Our listing of VLAN group(s) */
  43 struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  44 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  45
  46 static char vlan_fullname[] = "802.1Q VLAN Support";
  47 static char vlan_version[] = DRV_VERSION;
  48 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  49 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  50
  51 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  52 static int vlan_ioctl_handler(void __user *);
  53 static int unregister_vlan_dev(struct net_device *, unsigned short );
  54
  55 struct notifier_block vlan_notifier_block = {
  56         .notifier_call = vlan_device_event,
  57 };
  58
  59 /* These may be changed at run-time through IOCTLs */
  60
  61 /* Determines interface naming scheme. */
  62 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  63
  64 /* DO reorder the header by default */
  65 unsigned short vlan_default_dev_flags = 1;
  66
  67 static struct packet_type vlan_packet_type = {
  68         .type = __constant_htons(ETH_P_8021Q),
  69         .func = vlan_skb_recv, /* VLAN receive method */
  70 };
  71
  72 /* Bits of netdev state that are propagated from real device to virtual */
  73 #define VLAN_LINK_STATE_MASK \
  74         ((1<<__LINK_STATE_PRESENT)|(1<<__LINK_STATE_NOCARRIER))
  75
  76 /* End of global variables definitions. */
  77
  78 /*
  79  * Function vlan_proto_init (pro)
  80  *
  81  *    Initialize VLAN protocol layer,
  82  *
  83  */
  84 static int __init vlan_proto_init(void)
  85 {
  86         int err;
  87
  88         printk(VLAN_INF "%s v%s %s\n",
  89                vlan_fullname, vlan_version, vlan_copyright);
  90         printk(VLAN_INF "All bugs added by %s\n",
  91                vlan_buggyright);
  92
  93         /* proc file system initialization */
  94         err = vlan_proc_init();
  95         if (err < 0) {
  96                 printk(KERN_ERR
  97                        "%s %s: can't create entry in proc filesystem!\n",
  98                        __FUNCTION__, VLAN_NAME);
  99                 return err;
 100         }
 101
 102         dev_add_pack(&vlan_packet_type);
 103
 104         /* Register us to receive netdevice events */
 105         err = register_netdevice_notifier(&vlan_notifier_block);
 106         if (err < 0) {
 107                 dev_remove_pack(&vlan_packet_type);
 108                 vlan_proc_cleanup();
 109                 return err;
 110         }
 111
 112         vlan_ioctl_set(vlan_ioctl_handler);
 113
 114         return 0;
 115 }
 116
 117 /* Cleanup all vlan devices
 118  * Note: devices that have been registered that but not
 119  * brought up will exist but have no module ref count.
 120  */
 121 static void __exit vlan_cleanup_devices(void)
 122 {
 123         struct net_device *dev, *nxt;
 124
 125         rtnl_lock();
 126         for (dev = dev_base; dev; dev = nxt) {
 127                 nxt = dev->next;
 128                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 129                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 130                                             VLAN_DEV_INFO(dev)->vlan_id);
 131
 132                         unregister_netdevice(dev);
 133                 }
 134         }
 135         rtnl_unlock();
 136 }
 137
 138 /*
 139  *     Module 'remove' entry point.
 140  *     o delete /proc/net/router directory and static entries.
 141  */
 142 static void __exit vlan_cleanup_module(void)
 143 {
 144         int i;
 145
 146         vlan_ioctl_set(NULL);
 147
 148         /* Un-register us from receiving netdevice events */
 149         unregister_netdevice_notifier(&vlan_notifier_block);
 150
 151         dev_remove_pack(&vlan_packet_type);
 152         vlan_cleanup_devices();
 153
 154         /* This table must be empty if there are no module
 155          * references left.
 156          */
 157         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 158                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 159         }
 160         vlan_proc_cleanup();
 161
 162         synchronize_net();
 163 }
 164
 165 module_init(vlan_proto_init);
 166 module_exit(vlan_cleanup_module);
 167
 168 /* Must be invoked with RCU read lock (no preempt) */
 169 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 170 {
 171         struct vlan_group *grp;
 172         struct hlist_node *n;
 173         int hash = vlan_grp_hashfn(real_dev_ifindex);
 174
 175         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 176                 if (grp->real_dev_ifindex == real_dev_ifindex)
 177                         return grp;
 178         }
 179
 180         return NULL;
 181 }
 182
 183 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 184  *
 185  * Must be invoked with RCU read lock (no preempt)
 186  */
 187 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 188                                    unsigned short VID)
 189 {
 190         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 191
 192         if (grp)
 193                 return grp->vlan_devices[VID];
 194
 195         return NULL;
 196 }
 197
 198 static void vlan_rcu_free(struct rcu_head *rcu)
 199 {
 200         kfree(container_of(rcu, struct vlan_group, rcu));
 201 }
 202
 203
 204 /* This returns 0 if everything went fine.
 205  * It will return 1 if the group was killed as a result.
 206  * A negative return indicates failure.
 207  *
 208  * The RTNL lock must be held.
 209  */
 210 static int unregister_vlan_dev(struct net_device *real_dev,
 211                                unsigned short vlan_id)
 212 {
 213         struct net_device *dev = NULL;
 214         int real_dev_ifindex = real_dev->ifindex;
 215         struct vlan_group *grp;
 216         int i, ret;
 217
 218 #ifdef VLAN_DEBUG
 219         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 220 #endif
 221
 222         /* sanity check */
 223         if (vlan_id >= VLAN_VID_MASK)
 224                 return -EINVAL;
 225
 226         ASSERT_RTNL();
 227         grp = __vlan_find_group(real_dev_ifindex);
 228
 229         ret = 0;
 230
 231         if (grp) {
 232                 dev = grp->vlan_devices[vlan_id];
 233                 if (dev) {
 234                         /* Remove proc entry */
 235                         vlan_proc_rem_dev(dev);
 236
 237                         /* Take it out of our own structures, but be sure to
 238                          * interlock with HW accelerating devices or SW vlan
 239                          * input packet processing.
 240                          */
 241                         if (real_dev->features &
 242                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
 243                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 244                         }
 245
 246                         grp->vlan_devices[vlan_id] = NULL;
 247                         synchronize_net();
 248
 249
 250                         /* Caller unregisters (and if necessary, puts)
 251                          * VLAN device, but we get rid of the reference to
 252                          * real_dev here.
 253                          */
 254                         dev_put(real_dev);
 255
 256                         /* If the group is now empty, kill off the
 257                          * group.
 258                          */
 259                         for (i = 0; i < VLAN_VID_MASK; i++)
 260                                 if (grp->vlan_devices[i])
 261                                         break;
 262
 263                         if (i == VLAN_VID_MASK) {
 264                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 265                                         real_dev->vlan_rx_register(real_dev, NULL);
 266
 267                                 hlist_del_rcu(&grp->hlist);
 268
 269                                 /* Free the group, after all cpu's are done. */
 270                                 call_rcu(&grp->rcu, vlan_rcu_free);
 271
 272                                 grp = NULL;
 273                                 ret = 1;
 274                         }
 275                 }
 276         }
 277
 278         return ret;
 279 }
 280
 281 static int unregister_vlan_device(const char *vlan_IF_name)
 282 {
 283         struct net_device *dev = NULL;
 284         int ret;
 285
 286
 287         dev = dev_get_by_name(vlan_IF_name);
 288         ret = -EINVAL;
 289         if (dev) {
 290                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 291                         rtnl_lock();
 292
 293                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 294                                                   VLAN_DEV_INFO(dev)->vlan_id);
 295
 296                         dev_put(dev);
 297                         unregister_netdevice(dev);
 298
 299                         rtnl_unlock();
 300
 301                         if (ret == 1)
 302                                 ret = 0;
 303                 } else {
 304                         printk(VLAN_ERR
 305                                "%s: ERROR:      Tried to remove a non-vlan device "
 306                                "with VLAN code, name: %s  priv_flags: %hX\n",
 307                                __FUNCTION__, dev->name, dev->priv_flags);
 308                         dev_put(dev);
 309                         ret = -EPERM;
 310                 }
 311         } else {
 312 #ifdef VLAN_DEBUG
 313                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
 314 #endif
 315                 ret = -EINVAL;
 316         }
 317
 318         return ret;
 319 }
 320
 321 static void vlan_setup(struct net_device *new_dev)
 322 {
 323         SET_MODULE_OWNER(new_dev);
 324
 325         /* new_dev->ifindex = 0;  it will be set when added to
 326          * the global list.
 327          * iflink is set as well.
 328          */
 329         new_dev->get_stats = vlan_dev_get_stats;
 330
 331         /* Make this thing known as a VLAN device */
 332         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 333
 334         /* Set us up to have no queue, as the underlying Hardware device
 335          * can do all the queueing we could want.
 336          */
 337         new_dev->tx_queue_len = 0;
 338
 339         /* set up method calls */
 340         new_dev->change_mtu = vlan_dev_change_mtu;
 341         new_dev->open = vlan_dev_open;
 342         new_dev->stop = vlan_dev_stop;
 343         new_dev->set_mac_address = vlan_dev_set_mac_address;
 344         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 345         new_dev->destructor = free_netdev;
 346         new_dev->do_ioctl = vlan_dev_ioctl;
 347 }
 348
 349 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 350  *  Returns the device that was created, or NULL if there was
 351  *  an error of some kind.
 352  */
 353 static struct net_device *register_vlan_device(const char *eth_IF_name,
 354                                                unsigned short VLAN_ID)
 355 {
 356         struct vlan_group *grp;
 357         struct net_device *new_dev;
 358         struct net_device *real_dev; /* the ethernet device */
 359         char name[IFNAMSIZ];
 360
 361 #ifdef VLAN_DEBUG
 362         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 363                 __FUNCTION__, eth_IF_name, VLAN_ID);
 364 #endif
 365
 366         if (VLAN_ID >= VLAN_VID_MASK)
 367                 goto out_ret_null;
 368
 369         /* find the device relating to eth_IF_name. */
 370         real_dev = dev_get_by_name(eth_IF_name);
 371         if (!real_dev)
 372                 goto out_ret_null;
 373
 374         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 375                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 376                         __FUNCTION__, real_dev->name);
 377                 goto out_put_dev;
 378         }
 379
 380         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 381             (real_dev->vlan_rx_register == NULL ||
 382              real_dev->vlan_rx_kill_vid == NULL)) {
 383                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 384                         __FUNCTION__, real_dev->name);
 385                 goto out_put_dev;
 386         }
 387
 388         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 389             (real_dev->vlan_rx_add_vid == NULL ||
 390              real_dev->vlan_rx_kill_vid == NULL)) {
 391                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 392                         __FUNCTION__, real_dev->name);
 393                 goto out_put_dev;
 394         }
 395
 396         /* From this point on, all the data structures must remain
 397          * consistent.
 398          */
 399         rtnl_lock();
 400
 401         /* The real device must be up and operating in order to
 402          * assosciate a VLAN device with it.
 403          */
 404         if (!(real_dev->flags & IFF_UP))
 405                 goto out_unlock;
 406
 407         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 408                 /* was already registered. */
 409                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 410                 goto out_unlock;
 411         }
 412
 413         /* Gotta set up the fields for the device. */
 414 #ifdef VLAN_DEBUG
 415         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 416                vlan_name_type);
 417 #endif
 418         switch (vlan_name_type) {
 419         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 420                 /* name will look like:  eth1.0005 */
 421                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 422                 break;
 423         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 424                 /* Put our vlan.VID in the name.
 425                  * Name will look like:  vlan5
 426                  */
 427                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 428                 break;
 429         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 430                 /* Put our vlan.VID in the name.
 431                  * Name will look like:  eth0.5
 432                  */
 433                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 434                 break;
 435         case VLAN_NAME_TYPE_PLUS_VID:
 436                 /* Put our vlan.VID in the name.
 437                  * Name will look like:  vlan0005
 438                  */
 439         default:
 440                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 441         };
 442
 443         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 444                                vlan_setup);
 445         if (new_dev == NULL)
 446                 goto out_unlock;
 447
 448 #ifdef VLAN_DEBUG
 449         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 450 #endif
 451         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 452         new_dev->flags = real_dev->flags;
 453         new_dev->flags &= ~IFF_UP;
 454
 455         new_dev->state = real_dev->state & VLAN_LINK_STATE_MASK;
 456
 457         /* need 4 bytes for extra VLAN header info,
 458          * hope the underlying device can handle it.
 459          */
 460         new_dev->mtu = real_dev->mtu;
 461
 462         /* TODO: maybe just assign it to be ETHERNET? */
 463         new_dev->type = real_dev->type;
 464
 465         new_dev->hard_header_len = real_dev->hard_header_len;
 466         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 467                 /* Regular ethernet + 4 bytes (18 total). */
 468                 new_dev->hard_header_len += VLAN_HLEN;
 469         }
 470
 471         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 472                      new_dev->priv,
 473                      sizeof(struct vlan_dev_info));
 474
 475         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 476         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 477         new_dev->addr_len = real_dev->addr_len;
 478
 479         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 480                 new_dev->hard_header = real_dev->hard_header;
 481                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 482                 new_dev->rebuild_header = real_dev->rebuild_header;
 483         } else {
 484                 new_dev->hard_header = vlan_dev_hard_header;
 485                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 486                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 487         }
 488         new_dev->hard_header_parse = real_dev->hard_header_parse;
 489
 490         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 491         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 492         VLAN_DEV_INFO(new_dev)->dent = NULL;
 493         VLAN_DEV_INFO(new_dev)->flags = vlan_default_dev_flags;
 494
 495 #ifdef VLAN_DEBUG
 496         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 497                real_dev->ifindex);
 498 #endif
 499
 500         if (register_netdevice(new_dev))
 501                 goto out_free_newdev;
 502
 503         /* So, got the sucker initialized, now lets place
 504          * it into our local structure.
 505          */
 506         grp = __vlan_find_group(real_dev->ifindex);
 507
 508         /* Note, we are running under the RTNL semaphore
 509          * so it cannot "appear" on us.
 510          */
 511         if (!grp) { /* need to add a new group */
 512                 grp = kmalloc(sizeof(struct vlan_group), GFP_KERNEL);
 513                 if (!grp)
 514                         goto out_free_unregister;
 515
 516                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 517                 memset(grp, 0, sizeof(struct vlan_group));
 518                 grp->real_dev_ifindex = real_dev->ifindex;
 519
 520                 hlist_add_head_rcu(&grp->hlist,
 521                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 522
 523                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 524                         real_dev->vlan_rx_register(real_dev, grp);
 525         }
 526
 527         grp->vlan_devices[VLAN_ID] = new_dev;
 528
 529         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 530                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 531                                                          new_dev->name);
 532
 533         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 534                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 535
 536         rtnl_unlock();
 537
 538
 539 #ifdef VLAN_DEBUG
 540         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 541 #endif
 542         return new_dev;
 543
 544 out_free_unregister:
 545         unregister_netdev(new_dev);
 546         goto out_unlock;
 547
 548 out_free_newdev:
 549         free_netdev(new_dev);
 550
 551 out_unlock:
 552         rtnl_unlock();
 553
 554 out_put_dev:
 555         dev_put(real_dev);
 556
 557 out_ret_null:
 558         return NULL;
 559 }
 560
 561 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 562 {
 563         struct net_device *dev = ptr;
 564         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 565         int i, flgs;
 566         struct net_device *vlandev;
 567
 568         if (!grp)
 569                 goto out;
 570
 571         /* It is OK that we do not hold the group lock right now,
 572          * as we run under the RTNL lock.
 573          */
 574
 575         switch (event) {
 576         case NETDEV_CHANGE:
 577                 /* Propagate real device state to vlan devices */
 578                 flgs = dev->state & VLAN_LINK_STATE_MASK;
 579                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 580                         vlandev = grp->vlan_devices[i];
 581                         if (!vlandev)
 582                                 continue;
 583
 584                         if ((vlandev->state & VLAN_LINK_STATE_MASK) != flgs) {
 585                                 vlandev->state = (vlandev->state &~ VLAN_LINK_STATE_MASK)
 586                                         | flgs;
 587                                 netdev_state_change(vlandev);
 588                         }
 589                 }
 590                 break;
 591
 592         case NETDEV_DOWN:
 593                 /* Put all VLANs for this dev in the down state too.  */
 594                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 595                         vlandev = grp->vlan_devices[i];
 596                         if (!vlandev)
 597                                 continue;
 598
 599                         flgs = vlandev->flags;
 600                         if (!(flgs & IFF_UP))
 601                                 continue;
 602
 603                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 604                 }
 605                 break;
 606
 607         case NETDEV_UP:
 608                 /* Put all VLANs for this dev in the up 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_UNREGISTER:
 623                 /* Delete all VLANs for this dev. */
 624                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 625                         int ret;
 626
 627                         vlandev = grp->vlan_devices[i];
 628                         if (!vlandev)
 629                                 continue;
 630
 631                         ret = unregister_vlan_dev(dev,
 632                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 633
 634                         unregister_netdevice(vlandev);
 635
 636                         /* Group was destroyed? */
 637                         if (ret == 1)
 638                                 break;
 639                 }
 640                 break;
 641         };
 642
 643 out:
 644         return NOTIFY_DONE;
 645 }
 646
 647 /*
 648  *      VLAN IOCTL handler.
 649  *      o execute requested action or pass command to the device driver
 650  *   arg is really a struct vlan_ioctl_args __user *.
 651  */
 652 static int vlan_ioctl_handler(void __user *arg)
 653 {
 654         int err = 0;
 655         unsigned short vid = 0;
 656         struct vlan_ioctl_args args;
 657
 658         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 659                 return -EFAULT;
 660
 661         /* Null terminate this sucker, just in case. */
 662         args.device1[23] = 0;
 663         args.u.device2[23] = 0;
 664
 665 #ifdef VLAN_DEBUG
 666         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 667 #endif
 668
 669         switch (args.cmd) {
 670         case SET_VLAN_INGRESS_PRIORITY_CMD:
 671                 if (!capable(CAP_NET_ADMIN))
 672                         return -EPERM;
 673                 err = vlan_dev_set_ingress_priority(args.device1,
 674                                                     args.u.skb_priority,
 675                                                     args.vlan_qos);
 676                 break;
 677
 678         case SET_VLAN_EGRESS_PRIORITY_CMD:
 679                 if (!capable(CAP_NET_ADMIN))
 680                         return -EPERM;
 681                 err = vlan_dev_set_egress_priority(args.device1,
 682                                                    args.u.skb_priority,
 683                                                    args.vlan_qos);
 684                 break;
 685
 686         case SET_VLAN_FLAG_CMD:
 687                 if (!capable(CAP_NET_ADMIN))
 688                         return -EPERM;
 689                 err = vlan_dev_set_vlan_flag(args.device1,
 690                                              args.u.flag,
 691                                              args.vlan_qos);
 692                 break;
 693
 694         case SET_VLAN_NAME_TYPE_CMD:
 695                 if (!capable(CAP_NET_ADMIN))
 696                         return -EPERM;
 697                 if ((args.u.name_type >= 0) &&
 698                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 699                         vlan_name_type = args.u.name_type;
 700                         err = 0;
 701                 } else {
 702                         err = -EINVAL;
 703                 }
 704                 break;
 705
 706         case ADD_VLAN_CMD:
 707                 if (!capable(CAP_NET_ADMIN))
 708                         return -EPERM;
 709                 /* we have been given the name of the Ethernet Device we want to
 710                  * talk to:  args.dev1   We also have the
 711                  * VLAN ID:  args.u.VID
 712                  */
 713                 if (register_vlan_device(args.device1, args.u.VID)) {
 714                         err = 0;
 715                 } else {
 716                         err = -EINVAL;
 717                 }
 718                 break;
 719
 720         case DEL_VLAN_CMD:
 721                 if (!capable(CAP_NET_ADMIN))
 722                         return -EPERM;
 723                 /* Here, the args.dev1 is the actual VLAN we want
 724                  * to get rid of.
 725                  */
 726                 err = unregister_vlan_device(args.device1);
 727                 break;
 728
 729         case GET_VLAN_INGRESS_PRIORITY_CMD:
 730                 /* TODO:  Implement
 731                    err = vlan_dev_get_ingress_priority(args);
 732                    if (copy_to_user((void*)arg, &args,
 733                         sizeof(struct vlan_ioctl_args))) {
 734                         err = -EFAULT;
 735                    }
 736                 */
 737                 err = -EINVAL;
 738                 break;
 739         case GET_VLAN_EGRESS_PRIORITY_CMD:
 740                 /* TODO:  Implement
 741                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 742                    if (copy_to_user((void*)arg, &args,
 743                         sizeof(struct vlan_ioctl_args))) {
 744                         err = -EFAULT;
 745                    }
 746                 */
 747                 err = -EINVAL;
 748                 break;
 749         case GET_VLAN_REALDEV_NAME_CMD:
 750                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
 751                 if (copy_to_user(arg, &args,
 752                                  sizeof(struct vlan_ioctl_args))) {
 753                         err = -EFAULT;
 754                 }
 755                 break;
 756
 757         case GET_VLAN_VID_CMD:
 758                 err = vlan_dev_get_vid(args.device1, &vid);
 759                 args.u.VID = vid;
 760                 if (copy_to_user(arg, &args,
 761                                  sizeof(struct vlan_ioctl_args))) {
 762                       err = -EFAULT;
 763                 }
 764                 break;
 765
 766         default:
 767                 /* pass on to underlying device instead?? */
 768                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 769                         __FUNCTION__, args.cmd);
 770                 return -EINVAL;
 771         };
 772
 773         return err;
 774 }
 775
 776 MODULE_LICENSE("GPL");
 777 MODULE_VERSION(DRV_VERSION);