net/8021q/vlan.c

   1 /*
   2  * INET         802.1Q VLAN
   3  *              Ethernet-type device handling.
   4  *
   5  * Authors:     Ben Greear <greearb@candelatech.com>
   6  *              Please send support related email to: vlan@scry.wanfear.com
   7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
   8  *
   9  * Fixes:
  10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
  11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
  12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
  13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
  14  *
  15  *              This program is free software; you can redistribute it and/or
  16  *              modify it under the terms of the GNU General Public License
  17  *              as published by the Free Software Foundation; either version
  18  *              2 of the License, or (at your option) any later version.
  19  */
  20
  21 #include <asm/uaccess.h> /* for copy_from_user */
  22 #include <linux/capability.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/skbuff.h>
  26 #include <net/datalink.h>
  27 #include <linux/mm.h>
  28 #include <linux/in.h>
  29 #include <linux/init.h>
  30 #include <net/p8022.h>
  31 #include <net/arp.h>
  32 #include <linux/rtnetlink.h>
  33 #include <linux/notifier.h>
  34
  35 #include <linux/if_vlan.h>
  36 #include "vlan.h"
  37 #include "vlanproc.h"
  38
  39 #define DRV_VERSION "1.8"
  40
  41 /* Global VLAN variables */
  42
  43 /* Our listing of VLAN group(s) */
  44 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
  45 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
  46
  47 static char vlan_fullname[] = "802.1Q VLAN Support";
  48 static char vlan_version[] = DRV_VERSION;
  49 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
  50 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
  51
  52 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
  53 static int vlan_ioctl_handler(void __user *);
  54 static int unregister_vlan_dev(struct net_device *, unsigned short );
  55
  56 static struct notifier_block vlan_notifier_block = {
  57         .notifier_call = vlan_device_event,
  58 };
  59
  60 /* These may be changed at run-time through IOCTLs */
  61
  62 /* Determines interface naming scheme. */
  63 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
  64
  65 static struct packet_type vlan_packet_type = {
  66         .type = __constant_htons(ETH_P_8021Q),
  67         .func = vlan_skb_recv, /* VLAN receive method */
  68 };
  69
  70 /* End of global variables definitions. */
  71
  72 /*
  73  * Function vlan_proto_init (pro)
  74  *
  75  *    Initialize VLAN protocol layer,
  76  *
  77  */
  78 static int __init vlan_proto_init(void)
  79 {
  80         int err;
  81
  82         printk(VLAN_INF "%s v%s %s\n",
  83                vlan_fullname, vlan_version, vlan_copyright);
  84         printk(VLAN_INF "All bugs added by %s\n",
  85                vlan_buggyright);
  86
  87         /* proc file system initialization */
  88         err = vlan_proc_init();
  89         if (err < 0) {
  90                 printk(KERN_ERR
  91                        "%s %s: can't create entry in proc filesystem!\n",
  92                        __FUNCTION__, VLAN_NAME);
  93                 return err;
  94         }
  95
  96         dev_add_pack(&vlan_packet_type);
  97
  98         /* Register us to receive netdevice events */
  99         err = register_netdevice_notifier(&vlan_notifier_block);
 100         if (err < 0) {
 101                 dev_remove_pack(&vlan_packet_type);
 102                 vlan_proc_cleanup();
 103                 return err;
 104         }
 105
 106         vlan_ioctl_set(vlan_ioctl_handler);
 107
 108         return 0;
 109 }
 110
 111 /* Cleanup all vlan devices
 112  * Note: devices that have been registered that but not
 113  * brought up will exist but have no module ref count.
 114  */
 115 static void __exit vlan_cleanup_devices(void)
 116 {
 117         struct net_device *dev, *nxt;
 118
 119         rtnl_lock();
 120         for_each_netdev_safe(dev, nxt) {
 121                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 122                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 123                                             VLAN_DEV_INFO(dev)->vlan_id);
 124
 125                         unregister_netdevice(dev);
 126                 }
 127         }
 128         rtnl_unlock();
 129 }
 130
 131 /*
 132  *     Module 'remove' entry point.
 133  *     o delete /proc/net/router directory and static entries.
 134  */
 135 static void __exit vlan_cleanup_module(void)
 136 {
 137         int i;
 138
 139         vlan_ioctl_set(NULL);
 140
 141         /* Un-register us from receiving netdevice events */
 142         unregister_netdevice_notifier(&vlan_notifier_block);
 143
 144         dev_remove_pack(&vlan_packet_type);
 145         vlan_cleanup_devices();
 146
 147         /* This table must be empty if there are no module
 148          * references left.
 149          */
 150         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
 151                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
 152         }
 153         vlan_proc_cleanup();
 154
 155         synchronize_net();
 156 }
 157
 158 module_init(vlan_proto_init);
 159 module_exit(vlan_cleanup_module);
 160
 161 /* Must be invoked with RCU read lock (no preempt) */
 162 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
 163 {
 164         struct vlan_group *grp;
 165         struct hlist_node *n;
 166         int hash = vlan_grp_hashfn(real_dev_ifindex);
 167
 168         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
 169                 if (grp->real_dev_ifindex == real_dev_ifindex)
 170                         return grp;
 171         }
 172
 173         return NULL;
 174 }
 175
 176 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
 177  *
 178  * Must be invoked with RCU read lock (no preempt)
 179  */
 180 struct net_device *__find_vlan_dev(struct net_device *real_dev,
 181                                    unsigned short VID)
 182 {
 183         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
 184
 185         if (grp)
 186                 return vlan_group_get_device(grp, VID);
 187
 188         return NULL;
 189 }
 190
 191 static void vlan_group_free(struct vlan_group *grp)
 192 {
 193         int i;
 194
 195         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 196                 kfree(grp->vlan_devices_arrays[i]);
 197         kfree(grp);
 198 }
 199
 200 static void vlan_rcu_free(struct rcu_head *rcu)
 201 {
 202         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 203 }
 204
 205
 206 /* This returns 0 if everything went fine.
 207  * It will return 1 if the group was killed as a result.
 208  * A negative return indicates failure.
 209  *
 210  * The RTNL lock must be held.
 211  */
 212 static int unregister_vlan_dev(struct net_device *real_dev,
 213                                unsigned short vlan_id)
 214 {
 215         struct net_device *dev = NULL;
 216         int real_dev_ifindex = real_dev->ifindex;
 217         struct vlan_group *grp;
 218         int i, ret;
 219
 220 #ifdef VLAN_DEBUG
 221         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 222 #endif
 223
 224         /* sanity check */
 225         if (vlan_id >= VLAN_VID_MASK)
 226                 return -EINVAL;
 227
 228         ASSERT_RTNL();
 229         grp = __vlan_find_group(real_dev_ifindex);
 230
 231         ret = 0;
 232
 233         if (grp) {
 234                 dev = vlan_group_get_device(grp, vlan_id);
 235                 if (dev) {
 236                         /* Remove proc entry */
 237                         vlan_proc_rem_dev(dev);
 238
 239                         /* Take it out of our own structures, but be sure to
 240                          * interlock with HW accelerating devices or SW vlan
 241                          * input packet processing.
 242                          */
 243                         if (real_dev->features &
 244                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
 245                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 246                         }
 247
 248                         vlan_group_set_device(grp, vlan_id, NULL);
 249                         synchronize_net();
 250
 251
 252                         /* Caller unregisters (and if necessary, puts)
 253                          * VLAN device, but we get rid of the reference to
 254                          * real_dev here.
 255                          */
 256                         dev_put(real_dev);
 257
 258                         /* If the group is now empty, kill off the
 259                          * group.
 260                          */
 261                         for (i = 0; i < VLAN_VID_MASK; i++)
 262                                 if (vlan_group_get_device(grp, i))
 263                                         break;
 264
 265                         if (i == VLAN_VID_MASK) {
 266                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 267                                         real_dev->vlan_rx_register(real_dev, NULL);
 268
 269                                 hlist_del_rcu(&grp->hlist);
 270
 271                                 /* Free the group, after all cpu's are done. */
 272                                 call_rcu(&grp->rcu, vlan_rcu_free);
 273
 274                                 grp = NULL;
 275                                 ret = 1;
 276                         }
 277                 }
 278         }
 279
 280         return ret;
 281 }
 282
 283 static int unregister_vlan_device(const char *vlan_IF_name)
 284 {
 285         struct net_device *dev = NULL;
 286         int ret;
 287
 288
 289         dev = dev_get_by_name(vlan_IF_name);
 290         ret = -EINVAL;
 291         if (dev) {
 292                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 293                         rtnl_lock();
 294
 295                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 296                                                   VLAN_DEV_INFO(dev)->vlan_id);
 297
 298                         dev_put(dev);
 299                         unregister_netdevice(dev);
 300
 301                         rtnl_unlock();
 302
 303                         if (ret == 1)
 304                                 ret = 0;
 305                 } else {
 306                         printk(VLAN_ERR
 307                                "%s: ERROR:      Tried to remove a non-vlan device "
 308                                "with VLAN code, name: %s  priv_flags: %hX\n",
 309                                __FUNCTION__, dev->name, dev->priv_flags);
 310                         dev_put(dev);
 311                         ret = -EPERM;
 312                 }
 313         } else {
 314 #ifdef VLAN_DEBUG
 315                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
 316 #endif
 317                 ret = -EINVAL;
 318         }
 319
 320         return ret;
 321 }
 322
 323 static void vlan_setup(struct net_device *new_dev)
 324 {
 325         SET_MODULE_OWNER(new_dev);
 326
 327         /* new_dev->ifindex = 0;  it will be set when added to
 328          * the global list.
 329          * iflink is set as well.
 330          */
 331         new_dev->get_stats = vlan_dev_get_stats;
 332
 333         /* Make this thing known as a VLAN device */
 334         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 335
 336         /* Set us up to have no queue, as the underlying Hardware device
 337          * can do all the queueing we could want.
 338          */
 339         new_dev->tx_queue_len = 0;
 340
 341         /* set up method calls */
 342         new_dev->change_mtu = vlan_dev_change_mtu;
 343         new_dev->open = vlan_dev_open;
 344         new_dev->stop = vlan_dev_stop;
 345         new_dev->set_mac_address = vlan_dev_set_mac_address;
 346         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 347         new_dev->destructor = free_netdev;
 348         new_dev->do_ioctl = vlan_dev_ioctl;
 349 }
 350
 351 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 352 {
 353         /* Have to respect userspace enforced dormant state
 354          * of real device, also must allow supplicant running
 355          * on VLAN device
 356          */
 357         if (dev->operstate == IF_OPER_DORMANT)
 358                 netif_dormant_on(vlandev);
 359         else
 360                 netif_dormant_off(vlandev);
 361
 362         if (netif_carrier_ok(dev)) {
 363                 if (!netif_carrier_ok(vlandev))
 364                         netif_carrier_on(vlandev);
 365         } else {
 366                 if (netif_carrier_ok(vlandev))
 367                         netif_carrier_off(vlandev);
 368         }
 369 }
 370
 371 /*
 372  * vlan network devices have devices nesting below it, and are a special
 373  * "super class" of normal network devices; split their locks off into a
 374  * separate class since they always nest.
 375  */
 376 static struct lock_class_key vlan_netdev_xmit_lock_key;
 377
 378
 379 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 380  *  Returns the device that was created, or NULL if there was
 381  *  an error of some kind.
 382  */
 383 static struct net_device *register_vlan_device(const char *eth_IF_name,
 384                                                unsigned short VLAN_ID)
 385 {
 386         struct vlan_group *grp;
 387         struct net_device *new_dev;
 388         struct net_device *real_dev; /* the ethernet device */
 389         char name[IFNAMSIZ];
 390         int i;
 391
 392 #ifdef VLAN_DEBUG
 393         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 394                 __FUNCTION__, eth_IF_name, VLAN_ID);
 395 #endif
 396
 397         if (VLAN_ID >= VLAN_VID_MASK)
 398                 goto out_ret_null;
 399
 400         /* find the device relating to eth_IF_name. */
 401         real_dev = dev_get_by_name(eth_IF_name);
 402         if (!real_dev)
 403                 goto out_ret_null;
 404
 405         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 406                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 407                         __FUNCTION__, real_dev->name);
 408                 goto out_put_dev;
 409         }
 410
 411         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 412             (real_dev->vlan_rx_register == NULL ||
 413              real_dev->vlan_rx_kill_vid == NULL)) {
 414                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 415                         __FUNCTION__, real_dev->name);
 416                 goto out_put_dev;
 417         }
 418
 419         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 420             (real_dev->vlan_rx_add_vid == NULL ||
 421              real_dev->vlan_rx_kill_vid == NULL)) {
 422                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 423                         __FUNCTION__, real_dev->name);
 424                 goto out_put_dev;
 425         }
 426
 427         /* From this point on, all the data structures must remain
 428          * consistent.
 429          */
 430         rtnl_lock();
 431
 432         /* The real device must be up and operating in order to
 433          * assosciate a VLAN device with it.
 434          */
 435         if (!(real_dev->flags & IFF_UP))
 436                 goto out_unlock;
 437
 438         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 439                 /* was already registered. */
 440                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 441                 goto out_unlock;
 442         }
 443
 444         /* Gotta set up the fields for the device. */
 445 #ifdef VLAN_DEBUG
 446         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 447                vlan_name_type);
 448 #endif
 449         switch (vlan_name_type) {
 450         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 451                 /* name will look like:  eth1.0005 */
 452                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 453                 break;
 454         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 455                 /* Put our vlan.VID in the name.
 456                  * Name will look like:  vlan5
 457                  */
 458                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 459                 break;
 460         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 461                 /* Put our vlan.VID in the name.
 462                  * Name will look like:  eth0.5
 463                  */
 464                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 465                 break;
 466         case VLAN_NAME_TYPE_PLUS_VID:
 467                 /* Put our vlan.VID in the name.
 468                  * Name will look like:  vlan0005
 469                  */
 470         default:
 471                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 472         }
 473
 474         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 475                                vlan_setup);
 476
 477         if (new_dev == NULL)
 478                 goto out_unlock;
 479
 480 #ifdef VLAN_DEBUG
 481         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 482 #endif
 483         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 484         new_dev->flags = real_dev->flags;
 485         new_dev->flags &= ~IFF_UP;
 486
 487         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 488                                              (1<<__LINK_STATE_DORMANT))) |
 489                          (1<<__LINK_STATE_PRESENT);
 490
 491         /* need 4 bytes for extra VLAN header info,
 492          * hope the underlying device can handle it.
 493          */
 494         new_dev->mtu = real_dev->mtu;
 495
 496         /* TODO: maybe just assign it to be ETHERNET? */
 497         new_dev->type = real_dev->type;
 498
 499         new_dev->hard_header_len = real_dev->hard_header_len;
 500         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 501                 /* Regular ethernet + 4 bytes (18 total). */
 502                 new_dev->hard_header_len += VLAN_HLEN;
 503         }
 504
 505         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 506                      new_dev->priv,
 507                      sizeof(struct vlan_dev_info));
 508
 509         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 510         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 511         new_dev->addr_len = real_dev->addr_len;
 512
 513         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 514                 new_dev->hard_header = real_dev->hard_header;
 515                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 516                 new_dev->rebuild_header = real_dev->rebuild_header;
 517         } else {
 518                 new_dev->hard_header = vlan_dev_hard_header;
 519                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 520                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 521         }
 522         new_dev->hard_header_parse = real_dev->hard_header_parse;
 523
 524         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 525         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 526         VLAN_DEV_INFO(new_dev)->dent = NULL;
 527         VLAN_DEV_INFO(new_dev)->flags = 1;
 528
 529 #ifdef VLAN_DEBUG
 530         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 531                real_dev->ifindex);
 532 #endif
 533
 534         if (register_netdevice(new_dev))
 535                 goto out_free_newdev;
 536
 537         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 538
 539         new_dev->iflink = real_dev->ifindex;
 540         vlan_transfer_operstate(real_dev, new_dev);
 541         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
 542
 543         /* So, got the sucker initialized, now lets place
 544          * it into our local structure.
 545          */
 546         grp = __vlan_find_group(real_dev->ifindex);
 547
 548         /* Note, we are running under the RTNL semaphore
 549          * so it cannot "appear" on us.
 550          */
 551         if (!grp) { /* need to add a new group */
 552                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 553                 if (!grp)
 554                         goto out_free_unregister;
 555
 556                 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 557                         grp->vlan_devices_arrays[i] = kzalloc(
 558                                 sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
 559                                 GFP_KERNEL);
 560
 561                         if (!grp->vlan_devices_arrays[i])
 562                                 goto out_free_arrays;
 563                 }
 564
 565                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 566                 grp->real_dev_ifindex = real_dev->ifindex;
 567
 568                 hlist_add_head_rcu(&grp->hlist,
 569                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 570
 571                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 572                         real_dev->vlan_rx_register(real_dev, grp);
 573         }
 574
 575         vlan_group_set_device(grp, VLAN_ID, new_dev);
 576
 577         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 578                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 579                                                          new_dev->name);
 580
 581         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 582                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 583
 584         rtnl_unlock();
 585
 586
 587 #ifdef VLAN_DEBUG
 588         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 589 #endif
 590         return new_dev;
 591
 592 out_free_arrays:
 593         vlan_group_free(grp);
 594
 595 out_free_unregister:
 596         unregister_netdev(new_dev);
 597         goto out_unlock;
 598
 599 out_free_newdev:
 600         free_netdev(new_dev);
 601
 602 out_unlock:
 603         rtnl_unlock();
 604
 605 out_put_dev:
 606         dev_put(real_dev);
 607
 608 out_ret_null:
 609         return NULL;
 610 }
 611
 612 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 613 {
 614         struct net_device *dev = ptr;
 615         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 616         int i, flgs;
 617         struct net_device *vlandev;
 618
 619         if (!grp)
 620                 goto out;
 621
 622         /* It is OK that we do not hold the group lock right now,
 623          * as we run under the RTNL lock.
 624          */
 625
 626         switch (event) {
 627         case NETDEV_CHANGE:
 628                 /* Propagate real device state to vlan devices */
 629                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 630                         vlandev = vlan_group_get_device(grp, i);
 631                         if (!vlandev)
 632                                 continue;
 633
 634                         vlan_transfer_operstate(dev, vlandev);
 635                 }
 636                 break;
 637
 638         case NETDEV_DOWN:
 639                 /* Put all VLANs for this dev in the down state too.  */
 640                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 641                         vlandev = vlan_group_get_device(grp, i);
 642                         if (!vlandev)
 643                                 continue;
 644
 645                         flgs = vlandev->flags;
 646                         if (!(flgs & IFF_UP))
 647                                 continue;
 648
 649                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 650                 }
 651                 break;
 652
 653         case NETDEV_UP:
 654                 /* Put all VLANs for this dev in the up state too.  */
 655                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 656                         vlandev = vlan_group_get_device(grp, i);
 657                         if (!vlandev)
 658                                 continue;
 659
 660                         flgs = vlandev->flags;
 661                         if (flgs & IFF_UP)
 662                                 continue;
 663
 664                         dev_change_flags(vlandev, flgs | IFF_UP);
 665                 }
 666                 break;
 667
 668         case NETDEV_UNREGISTER:
 669                 /* Delete all VLANs for this dev. */
 670                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 671                         int ret;
 672
 673                         vlandev = vlan_group_get_device(grp, i);
 674                         if (!vlandev)
 675                                 continue;
 676
 677                         ret = unregister_vlan_dev(dev,
 678                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 679
 680                         unregister_netdevice(vlandev);
 681
 682                         /* Group was destroyed? */
 683                         if (ret == 1)
 684                                 break;
 685                 }
 686                 break;
 687         }
 688
 689 out:
 690         return NOTIFY_DONE;
 691 }
 692
 693 /*
 694  *      VLAN IOCTL handler.
 695  *      o execute requested action or pass command to the device driver
 696  *   arg is really a struct vlan_ioctl_args __user *.
 697  */
 698 static int vlan_ioctl_handler(void __user *arg)
 699 {
 700         int err = 0;
 701         unsigned short vid = 0;
 702         struct vlan_ioctl_args args;
 703
 704         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 705                 return -EFAULT;
 706
 707         /* Null terminate this sucker, just in case. */
 708         args.device1[23] = 0;
 709         args.u.device2[23] = 0;
 710
 711 #ifdef VLAN_DEBUG
 712         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 713 #endif
 714
 715         switch (args.cmd) {
 716         case SET_VLAN_INGRESS_PRIORITY_CMD:
 717                 if (!capable(CAP_NET_ADMIN))
 718                         return -EPERM;
 719                 err = vlan_dev_set_ingress_priority(args.device1,
 720                                                     args.u.skb_priority,
 721                                                     args.vlan_qos);
 722                 break;
 723
 724         case SET_VLAN_EGRESS_PRIORITY_CMD:
 725                 if (!capable(CAP_NET_ADMIN))
 726                         return -EPERM;
 727                 err = vlan_dev_set_egress_priority(args.device1,
 728                                                    args.u.skb_priority,
 729                                                    args.vlan_qos);
 730                 break;
 731
 732         case SET_VLAN_FLAG_CMD:
 733                 if (!capable(CAP_NET_ADMIN))
 734                         return -EPERM;
 735                 err = vlan_dev_set_vlan_flag(args.device1,
 736                                              args.u.flag,
 737                                              args.vlan_qos);
 738                 break;
 739
 740         case SET_VLAN_NAME_TYPE_CMD:
 741                 if (!capable(CAP_NET_ADMIN))
 742                         return -EPERM;
 743                 if ((args.u.name_type >= 0) &&
 744                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 745                         vlan_name_type = args.u.name_type;
 746                         err = 0;
 747                 } else {
 748                         err = -EINVAL;
 749                 }
 750                 break;
 751
 752         case ADD_VLAN_CMD:
 753                 if (!capable(CAP_NET_ADMIN))
 754                         return -EPERM;
 755                 /* we have been given the name of the Ethernet Device we want to
 756                  * talk to:  args.dev1   We also have the
 757                  * VLAN ID:  args.u.VID
 758                  */
 759                 if (register_vlan_device(args.device1, args.u.VID)) {
 760                         err = 0;
 761                 } else {
 762                         err = -EINVAL;
 763                 }
 764                 break;
 765
 766         case DEL_VLAN_CMD:
 767                 if (!capable(CAP_NET_ADMIN))
 768                         return -EPERM;
 769                 /* Here, the args.dev1 is the actual VLAN we want
 770                  * to get rid of.
 771                  */
 772                 err = unregister_vlan_device(args.device1);
 773                 break;
 774
 775         case GET_VLAN_INGRESS_PRIORITY_CMD:
 776                 /* TODO:  Implement
 777                    err = vlan_dev_get_ingress_priority(args);
 778                    if (copy_to_user((void*)arg, &args,
 779                         sizeof(struct vlan_ioctl_args))) {
 780                         err = -EFAULT;
 781                    }
 782                 */
 783                 err = -EINVAL;
 784                 break;
 785         case GET_VLAN_EGRESS_PRIORITY_CMD:
 786                 /* TODO:  Implement
 787                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 788                    if (copy_to_user((void*)arg, &args,
 789                         sizeof(struct vlan_ioctl_args))) {
 790                         err = -EFAULT;
 791                    }
 792                 */
 793                 err = -EINVAL;
 794                 break;
 795         case GET_VLAN_REALDEV_NAME_CMD:
 796                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
 797                 if (err)
 798                         goto out;
 799                 if (copy_to_user(arg, &args,
 800                                  sizeof(struct vlan_ioctl_args))) {
 801                         err = -EFAULT;
 802                 }
 803                 break;
 804
 805         case GET_VLAN_VID_CMD:
 806                 err = vlan_dev_get_vid(args.device1, &vid);
 807                 if (err)
 808                         goto out;
 809                 args.u.VID = vid;
 810                 if (copy_to_user(arg, &args,
 811                                  sizeof(struct vlan_ioctl_args))) {
 812                       err = -EFAULT;
 813                 }
 814                 break;
 815
 816         default:
 817                 /* pass on to underlying device instead?? */
 818                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 819                         __FUNCTION__, args.cmd);
 820                 return -EINVAL;
 821         }
 822 out:
 823         return err;
 824 }
 825
 826 MODULE_LICENSE("GPL");
 827 MODULE_VERSION(DRV_VERSION);