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 #include <net/net_namespace.h>
  35
  36 #include <linux/if_vlan.h>
  37 #include "vlan.h"
  38 #include "vlanproc.h"
  39
  40 #define DRV_VERSION "1.8"
  41
  42 /* Global VLAN variables */
  43
  44 /* Our listing of VLAN group(s) */
  45 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  46 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  47
  48 static char vlan_fullname[] = "802.1Q VLAN Support";
  49 static char vlan_version[] = DRV_VERSION;
  50 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  51 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  52
  53 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  54 static int vlan_ioctl_handler(struct net *net, void __user *);
  55 static int unregister_vlan_dev(struct net_device *, unsigned short );
  56
  57 static struct notifier_block vlan_notifier_block = {
  58         .notifier_call = vlan_device_event,
  59 };
  60
  61 /* These may be changed at run-time through IOCTLs */
  62
  63 /* Determines interface naming scheme. */
  64 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  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 /* End of global variables definitions. */
  72
  73 /*
  74  * Function vlan_proto_init (pro)
  75  *
  76  *    Initialize VLAN protocol layer,
  77  *
  78  */
  79 static int __init vlan_proto_init(void)
  80 {
  81         int err;
  82
  83         printk(VLAN_INF "%s v%s %s\n",
  84                vlan_fullname, vlan_version, vlan_copyright);
  85         printk(VLAN_INF "All bugs added by %s\n",
  86                vlan_buggyright);
  87
  88         /* proc file system initialization */
  89         err = vlan_proc_init();
  90         if (err < 0) {
  91                 printk(KERN_ERR
  92                        "%s: can't create entry in proc filesystem!\n",
  93                        __FUNCTION__);
  94                 return err;
  95         }
  96
  97         dev_add_pack(&vlan_packet_type);
  98
  99         /* Register us to receive netdevice events */
 100         err = register_netdevice_notifier(&vlan_notifier_block);
 101         if (err < 0)
 102                 goto err1;
 103
 104         err = vlan_netlink_init();
 105         if (err < 0)
 106                 goto err2;
 107
 108         vlan_ioctl_set(vlan_ioctl_handler);
 109         return 0;
 110
 111 err2:
 112         unregister_netdevice_notifier(&vlan_notifier_block);
 113 err1:
 114         vlan_proc_cleanup();
 115         dev_remove_pack(&vlan_packet_type);
 116         return err;
 117 }
 118
 119 /*
 120  *     Module 'remove' entry point.
 121  *     o delete /proc/net/router directory and static entries.
 122  */
 123 static void __exit vlan_cleanup_module(void)
 124 {
 125         int i;
 126
 127         vlan_ioctl_set(NULL);
 128         vlan_netlink_fini();
 129
 130         /* Un-register us from receiving netdevice events */
 131         unregister_netdevice_notifier(&vlan_notifier_block);
 132
 133         dev_remove_pack(&vlan_packet_type);
 134
 135         /* This table must be empty if there are no module
 136          * references left.
 137          */
 138         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 139                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 140         }
 141         vlan_proc_cleanup();
 142
 143         synchronize_net();
 144 }
 145
 146 module_init(vlan_proto_init);
 147 module_exit(vlan_cleanup_module);
 148
 149 /* Must be invoked with RCU read lock (no preempt) */
 150 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 151 {
 152         struct vlan_group *grp;
 153         struct hlist_node *n;
 154         int hash = vlan_grp_hashfn(real_dev_ifindex);
 155
 156         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 157                 if (grp->real_dev_ifindex == real_dev_ifindex)
 158                         return grp;
 159         }
 160
 161         return NULL;
 162 }
 163
 164 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 165  *
 166  * Must be invoked with RCU read lock (no preempt)
 167  */
 168 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 169                                    unsigned short VID)
 170 {
 171         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 172
 173         if (grp)
 174                 return vlan_group_get_device(grp, VID);
 175
 176         return NULL;
 177 }
 178
 179 static void vlan_group_free(struct vlan_group *grp)
 180 {
 181         int i;
 182
 183         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 184                 kfree(grp->vlan_devices_arrays[i]);
 185         kfree(grp);
 186 }
 187
 188 static struct vlan_group *vlan_group_alloc(int ifindex)
 189 {
 190         struct vlan_group *grp;
 191         unsigned int size;
 192         unsigned int i;
 193
 194         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 195         if (!grp)
 196                 return NULL;
 197
 198         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 199
 200         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 201                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
 202                 if (!grp->vlan_devices_arrays[i])
 203                         goto err;
 204         }
 205
 206         grp->real_dev_ifindex = ifindex;
 207         hlist_add_head_rcu(&grp->hlist,
 208                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
 209         return grp;
 210
 211 err:
 212         vlan_group_free(grp);
 213         return NULL;
 214 }
 215
 216 static void vlan_rcu_free(struct rcu_head *rcu)
 217 {
 218         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 219 }
 220
 221
 222 /* This returns 0 if everything went fine.
 223  * It will return 1 if the group was killed as a result.
 224  * A negative return indicates failure.
 225  *
 226  * The RTNL lock must be held.
 227  */
 228 static int unregister_vlan_dev(struct net_device *real_dev,
 229                                unsigned short vlan_id)
 230 {
 231         struct net_device *dev = NULL;
 232         int real_dev_ifindex = real_dev->ifindex;
 233         struct vlan_group *grp;
 234         int i, ret;
 235
 236 #ifdef VLAN_DEBUG
 237         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 238 #endif
 239
 240         /* sanity check */
 241         if (vlan_id >= VLAN_VID_MASK)
 242                 return -EINVAL;
 243
 244         ASSERT_RTNL();
 245         grp = __vlan_find_group(real_dev_ifindex);
 246
 247         ret = 0;
 248
 249         if (grp) {
 250                 dev = vlan_group_get_device(grp, vlan_id);
 251                 if (dev) {
 252                         /* Remove proc entry */
 253                         vlan_proc_rem_dev(dev);
 254
 255                         /* Take it out of our own structures, but be sure to
 256                          * interlock with HW accelerating devices or SW vlan
 257                          * input packet processing.
 258                          */
 259                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 260                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 261
 262                         vlan_group_set_device(grp, vlan_id, NULL);
 263                         synchronize_net();
 264
 265
 266                         /* Caller unregisters (and if necessary, puts)
 267                          * VLAN device, but we get rid of the reference to
 268                          * real_dev here.
 269                          */
 270                         dev_put(real_dev);
 271
 272                         /* If the group is now empty, kill off the
 273                          * group.
 274                          */
 275                         for (i = 0; i < VLAN_VID_MASK; i++)
 276                                 if (vlan_group_get_device(grp, i))
 277                                         break;
 278
 279                         if (i == VLAN_VID_MASK) {
 280                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 281                                         real_dev->vlan_rx_register(real_dev, NULL);
 282
 283                                 hlist_del_rcu(&grp->hlist);
 284
 285                                 /* Free the group, after all cpu's are done. */
 286                                 call_rcu(&grp->rcu, vlan_rcu_free);
 287
 288                                 grp = NULL;
 289                                 ret = 1;
 290                         }
 291                 }
 292         }
 293
 294         return ret;
 295 }
 296
 297 int unregister_vlan_device(struct net_device *dev)
 298 {
 299         int ret;
 300
 301         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 302                                   VLAN_DEV_INFO(dev)->vlan_id);
 303         unregister_netdevice(dev);
 304
 305         if (ret == 1)
 306                 ret = 0;
 307         return ret;
 308 }
 309
 310 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 311 {
 312         /* Have to respect userspace enforced dormant state
 313          * of real device, also must allow supplicant running
 314          * on VLAN device
 315          */
 316         if (dev->operstate == IF_OPER_DORMANT)
 317                 netif_dormant_on(vlandev);
 318         else
 319                 netif_dormant_off(vlandev);
 320
 321         if (netif_carrier_ok(dev)) {
 322                 if (!netif_carrier_ok(vlandev))
 323                         netif_carrier_on(vlandev);
 324         } else {
 325                 if (netif_carrier_ok(vlandev))
 326                         netif_carrier_off(vlandev);
 327         }
 328 }
 329
 330 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 331 {
 332         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 333                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 334                         __FUNCTION__, real_dev->name);
 335                 return -EOPNOTSUPP;
 336         }
 337
 338         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 339             !real_dev->vlan_rx_register) {
 340                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 341                         __FUNCTION__, real_dev->name);
 342                 return -EOPNOTSUPP;
 343         }
 344
 345         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 346             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 347                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 348                         __FUNCTION__, real_dev->name);
 349                 return -EOPNOTSUPP;
 350         }
 351
 352         /* The real device must be up and operating in order to
 353          * assosciate a VLAN device with it.
 354          */
 355         if (!(real_dev->flags & IFF_UP))
 356                 return -ENETDOWN;
 357
 358         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
 359                 /* was already registered. */
 360                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 361                 return -EEXIST;
 362         }
 363
 364         return 0;
 365 }
 366
 367 int register_vlan_dev(struct net_device *dev)
 368 {
 369         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 370         struct net_device *real_dev = vlan->real_dev;
 371         unsigned short vlan_id = vlan->vlan_id;
 372         struct vlan_group *grp, *ngrp = NULL;
 373         int err;
 374
 375         grp = __vlan_find_group(real_dev->ifindex);
 376         if (!grp) {
 377                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 378                 if (!grp)
 379                         return -ENOBUFS;
 380         }
 381
 382         err = register_netdevice(dev);
 383         if (err < 0)
 384                 goto out_free_group;
 385
 386         /* Account for reference in struct vlan_dev_info */
 387         dev_hold(real_dev);
 388
 389         vlan_transfer_operstate(real_dev, dev);
 390         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 391
 392         /* So, got the sucker initialized, now lets place
 393          * it into our local structure.
 394          */
 395         vlan_group_set_device(grp, vlan_id, dev);
 396         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 397                 real_dev->vlan_rx_register(real_dev, ngrp);
 398         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 399                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 400
 401         if (vlan_proc_add_dev(dev) < 0)
 402                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 403                        dev->name);
 404         return 0;
 405
 406 out_free_group:
 407         if (ngrp)
 408                 vlan_group_free(ngrp);
 409         return err;
 410 }
 411
 412 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 413  *  Returns 0 if the device was created or a negative error code otherwise.
 414  */
 415 static int register_vlan_device(struct net_device *real_dev,
 416                                 unsigned short VLAN_ID)
 417 {
 418         struct net_device *new_dev;
 419         char name[IFNAMSIZ];
 420         int err;
 421
 422 #ifdef VLAN_DEBUG
 423         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 424                 __FUNCTION__, eth_IF_name, VLAN_ID);
 425 #endif
 426
 427         if (VLAN_ID >= VLAN_VID_MASK)
 428                 return -ERANGE;
 429
 430         err = vlan_check_real_dev(real_dev, VLAN_ID);
 431         if (err < 0)
 432                 return err;
 433
 434         /* Gotta set up the fields for the device. */
 435 #ifdef VLAN_DEBUG
 436         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 437                vlan_name_type);
 438 #endif
 439         switch (vlan_name_type) {
 440         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 441                 /* name will look like:  eth1.0005 */
 442                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 443                 break;
 444         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 445                 /* Put our vlan.VID in the name.
 446                  * Name will look like:  vlan5
 447                  */
 448                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 449                 break;
 450         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 451                 /* Put our vlan.VID in the name.
 452                  * Name will look like:  eth0.5
 453                  */
 454                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 455                 break;
 456         case VLAN_NAME_TYPE_PLUS_VID:
 457                 /* Put our vlan.VID in the name.
 458                  * Name will look like:  vlan0005
 459                  */
 460         default:
 461                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 462         }
 463
 464         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 465                                vlan_setup);
 466
 467         if (new_dev == NULL)
 468                 return -ENOBUFS;
 469
 470         /* need 4 bytes for extra VLAN header info,
 471          * hope the underlying device can handle it.
 472          */
 473         new_dev->mtu = real_dev->mtu;
 474
 475 #ifdef VLAN_DEBUG
 476         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 477         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 478                      new_dev->priv,
 479                      sizeof(struct vlan_dev_info));
 480 #endif
 481
 482         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 483         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 484         VLAN_DEV_INFO(new_dev)->dent = NULL;
 485         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 486
 487         new_dev->rtnl_link_ops = &vlan_link_ops;
 488         err = register_vlan_dev(new_dev);
 489         if (err < 0)
 490                 goto out_free_newdev;
 491
 492 #ifdef VLAN_DEBUG
 493         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 494 #endif
 495         return 0;
 496
 497 out_free_newdev:
 498         free_netdev(new_dev);
 499         return err;
 500 }
 501
 502 static void vlan_sync_address(struct net_device *dev,
 503                               struct net_device *vlandev)
 504 {
 505         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
 506
 507         /* May be called without an actual change */
 508         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 509                 return;
 510
 511         /* vlan address was different from the old address and is equal to
 512          * the new address */
 513         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 514             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 515                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 516
 517         /* vlan address was equal to the old address and is different from
 518          * the new address */
 519         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 520             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 521                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 522
 523         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 524 }
 525
 526 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 527 {
 528         struct net_device *dev = ptr;
 529         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 530         int i, flgs;
 531         struct net_device *vlandev;
 532
 533         if (dev->nd_net != &init_net)
 534                 return NOTIFY_DONE;
 535
 536         if (!grp)
 537                 goto out;
 538
 539         /* It is OK that we do not hold the group lock right now,
 540          * as we run under the RTNL lock.
 541          */
 542
 543         switch (event) {
 544         case NETDEV_CHANGE:
 545                 /* Propagate real device state to vlan devices */
 546                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 547                         vlandev = vlan_group_get_device(grp, i);
 548                         if (!vlandev)
 549                                 continue;
 550
 551                         vlan_transfer_operstate(dev, vlandev);
 552                 }
 553                 break;
 554
 555         case NETDEV_CHANGEADDR:
 556                 /* Adjust unicast filters on underlying device */
 557                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 558                         vlandev = vlan_group_get_device(grp, i);
 559                         if (!vlandev)
 560                                 continue;
 561
 562                         flgs = vlandev->flags;
 563                         if (!(flgs & IFF_UP))
 564                                 continue;
 565
 566                         vlan_sync_address(dev, vlandev);
 567                 }
 568                 break;
 569
 570         case NETDEV_DOWN:
 571                 /* Put all VLANs for this dev in the down state too.  */
 572                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 573                         vlandev = vlan_group_get_device(grp, i);
 574                         if (!vlandev)
 575                                 continue;
 576
 577                         flgs = vlandev->flags;
 578                         if (!(flgs & IFF_UP))
 579                                 continue;
 580
 581                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 582                 }
 583                 break;
 584
 585         case NETDEV_UP:
 586                 /* Put all VLANs for this dev in the up state too.  */
 587                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 588                         vlandev = vlan_group_get_device(grp, i);
 589                         if (!vlandev)
 590                                 continue;
 591
 592                         flgs = vlandev->flags;
 593                         if (flgs & IFF_UP)
 594                                 continue;
 595
 596                         dev_change_flags(vlandev, flgs | IFF_UP);
 597                 }
 598                 break;
 599
 600         case NETDEV_UNREGISTER:
 601                 /* Delete all VLANs for this dev. */
 602                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 603                         int ret;
 604
 605                         vlandev = vlan_group_get_device(grp, i);
 606                         if (!vlandev)
 607                                 continue;
 608
 609                         ret = unregister_vlan_dev(dev,
 610                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 611
 612                         unregister_netdevice(vlandev);
 613
 614                         /* Group was destroyed? */
 615                         if (ret == 1)
 616                                 break;
 617                 }
 618                 break;
 619         }
 620
 621 out:
 622         return NOTIFY_DONE;
 623 }
 624
 625 /*
 626  *      VLAN IOCTL handler.
 627  *      o execute requested action or pass command to the device driver
 628  *   arg is really a struct vlan_ioctl_args __user *.
 629  */
 630 static int vlan_ioctl_handler(struct net *net, void __user *arg)
 631 {
 632         int err;
 633         unsigned short vid = 0;
 634         struct vlan_ioctl_args args;
 635         struct net_device *dev = NULL;
 636
 637         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 638                 return -EFAULT;
 639
 640         /* Null terminate this sucker, just in case. */
 641         args.device1[23] = 0;
 642         args.u.device2[23] = 0;
 643
 644 #ifdef VLAN_DEBUG
 645         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 646 #endif
 647
 648         rtnl_lock();
 649
 650         switch (args.cmd) {
 651         case SET_VLAN_INGRESS_PRIORITY_CMD:
 652         case SET_VLAN_EGRESS_PRIORITY_CMD:
 653         case SET_VLAN_FLAG_CMD:
 654         case ADD_VLAN_CMD:
 655         case DEL_VLAN_CMD:
 656         case GET_VLAN_REALDEV_NAME_CMD:
 657         case GET_VLAN_VID_CMD:
 658                 err = -ENODEV;
 659                 dev = __dev_get_by_name(&init_net, args.device1);
 660                 if (!dev)
 661                         goto out;
 662
 663                 err = -EINVAL;
 664                 if (args.cmd != ADD_VLAN_CMD &&
 665                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 666                         goto out;
 667         }
 668
 669         switch (args.cmd) {
 670         case SET_VLAN_INGRESS_PRIORITY_CMD:
 671                 err = -EPERM;
 672                 if (!capable(CAP_NET_ADMIN))
 673                         break;
 674                 vlan_dev_set_ingress_priority(dev,
 675                                               args.u.skb_priority,
 676                                               args.vlan_qos);
 677                 err = 0;
 678                 break;
 679
 680         case SET_VLAN_EGRESS_PRIORITY_CMD:
 681                 err = -EPERM;
 682                 if (!capable(CAP_NET_ADMIN))
 683                         break;
 684                 err = vlan_dev_set_egress_priority(dev,
 685                                                    args.u.skb_priority,
 686                                                    args.vlan_qos);
 687                 break;
 688
 689         case SET_VLAN_FLAG_CMD:
 690                 err = -EPERM;
 691                 if (!capable(CAP_NET_ADMIN))
 692                         break;
 693                 err = vlan_dev_set_vlan_flag(dev,
 694                                              args.u.flag,
 695                                              args.vlan_qos);
 696                 break;
 697
 698         case SET_VLAN_NAME_TYPE_CMD:
 699                 err = -EPERM;
 700                 if (!capable(CAP_NET_ADMIN))
 701                         break;
 702                 if ((args.u.name_type >= 0) &&
 703                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 704                         vlan_name_type = args.u.name_type;
 705                         err = 0;
 706                 } else {
 707                         err = -EINVAL;
 708                 }
 709                 break;
 710
 711         case ADD_VLAN_CMD:
 712                 err = -EPERM;
 713                 if (!capable(CAP_NET_ADMIN))
 714                         break;
 715                 err = register_vlan_device(dev, args.u.VID);
 716                 break;
 717
 718         case DEL_VLAN_CMD:
 719                 err = -EPERM;
 720                 if (!capable(CAP_NET_ADMIN))
 721                         break;
 722                 err = unregister_vlan_device(dev);
 723                 break;
 724
 725         case GET_VLAN_INGRESS_PRIORITY_CMD:
 726                 /* TODO:  Implement
 727                    err = vlan_dev_get_ingress_priority(args);
 728                    if (copy_to_user((void*)arg, &args,
 729                         sizeof(struct vlan_ioctl_args))) {
 730                         err = -EFAULT;
 731                    }
 732                 */
 733                 err = -EINVAL;
 734                 break;
 735         case GET_VLAN_EGRESS_PRIORITY_CMD:
 736                 /* TODO:  Implement
 737                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 738                    if (copy_to_user((void*)arg, &args,
 739                         sizeof(struct vlan_ioctl_args))) {
 740                         err = -EFAULT;
 741                    }
 742                 */
 743                 err = -EINVAL;
 744                 break;
 745         case GET_VLAN_REALDEV_NAME_CMD:
 746                 err = 0;
 747                 vlan_dev_get_realdev_name(dev, args.u.device2);
 748                 if (copy_to_user(arg, &args,
 749                                  sizeof(struct vlan_ioctl_args))) {
 750                         err = -EFAULT;
 751                 }
 752                 break;
 753
 754         case GET_VLAN_VID_CMD:
 755                 err = 0;
 756                 vlan_dev_get_vid(dev, &vid);
 757                 args.u.VID = vid;
 758                 if (copy_to_user(arg, &args,
 759                                  sizeof(struct vlan_ioctl_args))) {
 760                       err = -EFAULT;
 761                 }
 762                 break;
 763
 764         default:
 765                 /* pass on to underlying device instead?? */
 766                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 767                         __FUNCTION__, args.cmd);
 768                 err = -EINVAL;
 769                 break;
 770         }
 771 out:
 772         rtnl_unlock();
 773         return err;
 774 }
 775
 776 MODULE_LICENSE("GPL");
 777 MODULE_VERSION(DRV_VERSION);