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