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 /* Global VLAN variables */
  39
  40 /* Our listing of VLAN group(s) */
  41 struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  42 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  43
  44 static char vlan_fullname[] = "802.1Q VLAN Support";
  45 static unsigned int vlan_version = 1;
  46 static unsigned int vlan_release = 8;
  47 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  48 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  49
  50 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  51 static int vlan_ioctl_handler(void __user *);
  52 static int unregister_vlan_dev(struct net_device *, unsigned short );
  53
  54 struct notifier_block vlan_notifier_block = {
  55         .notifier_call = vlan_device_event,
  56 };
  57
  58 /* These may be changed at run-time through IOCTLs */
  59
  60 /* Determines interface naming scheme. */
  61 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  62
  63 /* DO reorder the header by default */
  64 unsigned short vlan_default_dev_flags = 1;
  65
  66 static struct packet_type vlan_packet_type = {
  67         .type = __constant_htons(ETH_P_8021Q),
  68         .func = vlan_skb_recv, /* VLAN receive method */
  69 };
  70
  71 /* Bits of netdev state that are propogated from real device to virtual */
  72 #define VLAN_LINK_STATE_MASK \
  73         ((1<<__LINK_STATE_PRESENT)|(1<<__LINK_STATE_NOCARRIER))
  74
  75 /* End of global variables definitions. */
  76
  77 /*
  78  * Function vlan_proto_init (pro)
  79  *
  80  *    Initialize VLAN protocol layer,
  81  *
  82  */
  83 static int __init vlan_proto_init(void)
  84 {
  85         int err;
  86
  87         printk(VLAN_INF "%s v%u.%u %s\n",
  88                vlan_fullname, vlan_version, vlan_release, vlan_copyright);
  89         printk(VLAN_INF "All bugs added by %s\n",
  90                vlan_buggyright);
  91
  92         /* proc file system initialization */
  93         err = vlan_proc_init();
  94         if (err < 0) {
  95                 printk(KERN_ERR
  96                        "%s %s: can't create entry in proc filesystem!\n",
  97                        __FUNCTION__, VLAN_NAME);
  98                 return 1;
  99         }
 100
 101         dev_add_pack(&vlan_packet_type);
 102
 103         /* Register us to receive netdevice events */
 104         register_netdevice_notifier(&vlan_notifier_block);
 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 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 344  *  Returns the device that was created, or NULL if there was
 345  *  an error of some kind.
 346  */
 347 static struct net_device *register_vlan_device(const char *eth_IF_name,
 348                                                unsigned short VLAN_ID)
 349 {
 350         struct vlan_group *grp;
 351         struct net_device *new_dev;
 352         struct net_device *real_dev; /* the ethernet device */
 353         char name[IFNAMSIZ];
 354
 355 #ifdef VLAN_DEBUG
 356         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 357                 __FUNCTION__, eth_IF_name, VLAN_ID);
 358 #endif
 359
 360         if (VLAN_ID >= VLAN_VID_MASK)
 361                 goto out_ret_null;
 362
 363         /* find the device relating to eth_IF_name. */
 364         real_dev = dev_get_by_name(eth_IF_name);
 365         if (!real_dev)
 366                 goto out_ret_null;
 367
 368         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 369                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 370                         __FUNCTION__, real_dev->name);
 371                 goto out_put_dev;
 372         }
 373
 374         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 375             (real_dev->vlan_rx_register == NULL ||
 376              real_dev->vlan_rx_kill_vid == NULL)) {
 377                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 378                         __FUNCTION__, real_dev->name);
 379                 goto out_put_dev;
 380         }
 381
 382         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 383             (real_dev->vlan_rx_add_vid == NULL ||
 384              real_dev->vlan_rx_kill_vid == NULL)) {
 385                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 386                         __FUNCTION__, real_dev->name);
 387                 goto out_put_dev;
 388         }
 389
 390         /* From this point on, all the data structures must remain
 391          * consistent.
 392          */
 393         rtnl_lock();
 394
 395         /* The real device must be up and operating in order to
 396          * assosciate a VLAN device with it.
 397          */
 398         if (!(real_dev->flags & IFF_UP))
 399                 goto out_unlock;
 400
 401         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 402                 /* was already registered. */
 403                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 404                 goto out_unlock;
 405         }
 406
 407         /* Gotta set up the fields for the device. */
 408 #ifdef VLAN_DEBUG
 409         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 410                vlan_name_type);
 411 #endif
 412         switch (vlan_name_type) {
 413         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 414                 /* name will look like:  eth1.0005 */
 415                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 416                 break;
 417         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 418                 /* Put our vlan.VID in the name.
 419                  * Name will look like:  vlan5
 420                  */
 421                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 422                 break;
 423         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 424                 /* Put our vlan.VID in the name.
 425                  * Name will look like:  eth0.5
 426                  */
 427                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 428                 break;
 429         case VLAN_NAME_TYPE_PLUS_VID:
 430                 /* Put our vlan.VID in the name.
 431                  * Name will look like:  vlan0005
 432                  */
 433         default:
 434                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 435         };
 436
 437         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 438                                vlan_setup);
 439         if (new_dev == NULL)
 440                 goto out_unlock;
 441
 442 #ifdef VLAN_DEBUG
 443         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 444 #endif
 445         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 446         new_dev->flags = real_dev->flags;
 447         new_dev->flags &= ~IFF_UP;
 448
 449         new_dev->state = real_dev->state & VLAN_LINK_STATE_MASK;
 450
 451         /* need 4 bytes for extra VLAN header info,
 452          * hope the underlying device can handle it.
 453          */
 454         new_dev->mtu = real_dev->mtu;
 455
 456         /* TODO: maybe just assign it to be ETHERNET? */
 457         new_dev->type = real_dev->type;
 458
 459         new_dev->hard_header_len = real_dev->hard_header_len;
 460         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 461                 /* Regular ethernet + 4 bytes (18 total). */
 462                 new_dev->hard_header_len += VLAN_HLEN;
 463         }
 464
 465         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 466                      new_dev->priv,
 467                      sizeof(struct vlan_dev_info));
 468
 469         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 470         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 471         new_dev->addr_len = real_dev->addr_len;
 472
 473         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 474                 new_dev->hard_header = real_dev->hard_header;
 475                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 476                 new_dev->rebuild_header = real_dev->rebuild_header;
 477         } else {
 478                 new_dev->hard_header = vlan_dev_hard_header;
 479                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 480                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 481         }
 482         new_dev->hard_header_parse = real_dev->hard_header_parse;
 483
 484         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 485         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 486         VLAN_DEV_INFO(new_dev)->dent = NULL;
 487         VLAN_DEV_INFO(new_dev)->flags = vlan_default_dev_flags;
 488
 489 #ifdef VLAN_DEBUG
 490         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 491                real_dev->ifindex);
 492 #endif
 493
 494         if (register_netdevice(new_dev))
 495                 goto out_free_newdev;
 496
 497         /* So, got the sucker initialized, now lets place
 498          * it into our local structure.
 499          */
 500         grp = __vlan_find_group(real_dev->ifindex);
 501
 502         /* Note, we are running under the RTNL semaphore
 503          * so it cannot "appear" on us.
 504          */
 505         if (!grp) { /* need to add a new group */
 506                 grp = kmalloc(sizeof(struct vlan_group), GFP_KERNEL);
 507                 if (!grp)
 508                         goto out_free_unregister;
 509
 510                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 511                 memset(grp, 0, sizeof(struct vlan_group));
 512                 grp->real_dev_ifindex = real_dev->ifindex;
 513
 514                 hlist_add_head_rcu(&grp->hlist,
 515                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 516
 517                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 518                         real_dev->vlan_rx_register(real_dev, grp);
 519         }
 520
 521         grp->vlan_devices[VLAN_ID] = new_dev;
 522
 523         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 524                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 525                                                          new_dev->name);
 526
 527         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 528                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 529
 530         rtnl_unlock();
 531
 532
 533 #ifdef VLAN_DEBUG
 534         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 535 #endif
 536         return new_dev;
 537
 538 out_free_unregister:
 539         unregister_netdev(new_dev);
 540         goto out_unlock;
 541
 542 out_free_newdev:
 543         free_netdev(new_dev);
 544
 545 out_unlock:
 546         rtnl_unlock();
 547
 548 out_put_dev:
 549         dev_put(real_dev);
 550
 551 out_ret_null:
 552         return NULL;
 553 }
 554
 555 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 556 {
 557         struct net_device *dev = ptr;
 558         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 559         int i, flgs;
 560         struct net_device *vlandev;
 561
 562         if (!grp)
 563                 goto out;
 564
 565         /* It is OK that we do not hold the group lock right now,
 566          * as we run under the RTNL lock.
 567          */
 568
 569         switch (event) {
 570         case NETDEV_CHANGE:
 571                 /* Propogate real device state to vlan devices */
 572                 flgs = dev->state & VLAN_LINK_STATE_MASK;
 573                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 574                         vlandev = grp->vlan_devices[i];
 575                         if (!vlandev)
 576                                 continue;
 577
 578                         if ((vlandev->state & VLAN_LINK_STATE_MASK) != flgs) {
 579                                 vlandev->state = (vlandev->state &~ VLAN_LINK_STATE_MASK)
 580                                         | flgs;
 581                                 netdev_state_change(vlandev);
 582                         }
 583                 }
 584                 break;
 585
 586         case NETDEV_DOWN:
 587                 /* Put all VLANs for this dev in the down state too.  */
 588                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 589                         vlandev = grp->vlan_devices[i];
 590                         if (!vlandev)
 591                                 continue;
 592
 593                         flgs = vlandev->flags;
 594                         if (!(flgs & IFF_UP))
 595                                 continue;
 596
 597                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 598                 }
 599                 break;
 600
 601         case NETDEV_UP:
 602                 /* Put all VLANs for this dev in the up state too.  */
 603                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 604                         vlandev = grp->vlan_devices[i];
 605                         if (!vlandev)
 606                                 continue;
 607
 608                         flgs = vlandev->flags;
 609                         if (flgs & IFF_UP)
 610                                 continue;
 611
 612                         dev_change_flags(vlandev, flgs | IFF_UP);
 613                 }
 614                 break;
 615
 616         case NETDEV_UNREGISTER:
 617                 /* Delete all VLANs for this dev. */
 618                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 619                         int ret;
 620
 621                         vlandev = grp->vlan_devices[i];
 622                         if (!vlandev)
 623                                 continue;
 624
 625                         ret = unregister_vlan_dev(dev,
 626                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 627
 628                         unregister_netdevice(vlandev);
 629
 630                         /* Group was destroyed? */
 631                         if (ret == 1)
 632                                 break;
 633                 }
 634                 break;
 635         };
 636
 637 out:
 638         return NOTIFY_DONE;
 639 }
 640
 641 /*
 642  *      VLAN IOCTL handler.
 643  *      o execute requested action or pass command to the device driver
 644  *   arg is really a struct vlan_ioctl_args __user *.
 645  */
 646 static int vlan_ioctl_handler(void __user *arg)
 647 {
 648         int err = 0;
 649         struct vlan_ioctl_args args;
 650
 651         /* everything here needs root permissions, except aguably the
 652          * hack ioctls for sending packets.  However, I know _I_ don't
 653          * want users running that on my network! --BLG
 654          */
 655         if (!capable(CAP_NET_ADMIN))
 656                 return -EPERM;
 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                 err = vlan_dev_set_ingress_priority(args.device1,
 672                                                     args.u.skb_priority,
 673                                                     args.vlan_qos);
 674                 break;
 675
 676         case SET_VLAN_EGRESS_PRIORITY_CMD:
 677                 err = vlan_dev_set_egress_priority(args.device1,
 678                                                    args.u.skb_priority,
 679                                                    args.vlan_qos);
 680                 break;
 681
 682         case SET_VLAN_FLAG_CMD:
 683                 err = vlan_dev_set_vlan_flag(args.device1,
 684                                              args.u.flag,
 685                                              args.vlan_qos);
 686                 break;
 687
 688         case SET_VLAN_NAME_TYPE_CMD:
 689                 if ((args.u.name_type >= 0) &&
 690                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 691                         vlan_name_type = args.u.name_type;
 692                         err = 0;
 693                 } else {
 694                         err = -EINVAL;
 695                 }
 696                 break;
 697
 698                 /* TODO:  Figure out how to pass info back...
 699                    case GET_VLAN_INGRESS_PRIORITY_IOCTL:
 700                    err = vlan_dev_get_ingress_priority(args);
 701                    break;
 702
 703                    case GET_VLAN_EGRESS_PRIORITY_IOCTL:
 704                    err = vlan_dev_get_egress_priority(args);
 705                    break;
 706                 */
 707
 708         case ADD_VLAN_CMD:
 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                 /* Here, the args.dev1 is the actual VLAN we want
 722                  * to get rid of.
 723                  */
 724                 err = unregister_vlan_device(args.device1);
 725                 break;
 726
 727         default:
 728                 /* pass on to underlying device instead?? */
 729                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 730                         __FUNCTION__, args.cmd);
 731                 return -EINVAL;
 732         };
 733
 734         return err;
 735 }
 736
 737 MODULE_LICENSE("GPL");