git.oblomov.eu Git - linux-2.6/blob - 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 (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 vlan_group_get_device(grp, VID);
 188
 189         return NULL;
 190 }
 191
 192 static void vlan_group_free(struct vlan_group *grp)
 193 {
 194         int i;
 195
 196         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 197                 kfree(grp->vlan_devices_arrays[i]);
 198         kfree(grp);
 199 }
 200
 201 static void vlan_rcu_free(struct rcu_head *rcu)
 202 {
 203         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 204 }
 205
 206
 207 /* This returns 0 if everything went fine.
 208  * It will return 1 if the group was killed as a result.
 209  * A negative return indicates failure.
 210  *
 211  * The RTNL lock must be held.
 212  */
 213 static int unregister_vlan_dev(struct net_device *real_dev,
 214                                unsigned short vlan_id)
 215 {
 216         struct net_device *dev = NULL;
 217         int real_dev_ifindex = real_dev->ifindex;
 218         struct vlan_group *grp;
 219         int i, ret;
 220
 221 #ifdef VLAN_DEBUG
 222         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
 223 #endif
 224
 225         /* sanity check */
 226         if (vlan_id >= VLAN_VID_MASK)
 227                 return -EINVAL;
 228
 229         ASSERT_RTNL();
 230         grp = __vlan_find_group(real_dev_ifindex);
 231
 232         ret = 0;
 233
 234         if (grp) {
 235                 dev = vlan_group_get_device(grp, vlan_id);
 236                 if (dev) {
 237                         /* Remove proc entry */
 238                         vlan_proc_rem_dev(dev);
 239
 240                         /* Take it out of our own structures, but be sure to
 241                          * interlock with HW accelerating devices or SW vlan
 242                          * input packet processing.
 243                          */
 244                         if (real_dev->features &
 245                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
 246                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
 247                         }
 248
 249                         vlan_group_set_device(grp, vlan_id, NULL);
 250                         synchronize_net();
 251
 252
 253                         /* Caller unregisters (and if necessary, puts)
 254                          * VLAN device, but we get rid of the reference to
 255                          * real_dev here.
 256                          */
 257                         dev_put(real_dev);
 258
 259                         /* If the group is now empty, kill off the
 260                          * group.
 261                          */
 262                         for (i = 0; i < VLAN_VID_MASK; i++)
 263                                 if (vlan_group_get_device(grp, i))
 264                                         break;
 265
 266                         if (i == VLAN_VID_MASK) {
 267                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 268                                         real_dev->vlan_rx_register(real_dev, NULL);
 269
 270                                 hlist_del_rcu(&grp->hlist);
 271
 272                                 /* Free the group, after all cpu's are done. */
 273                                 call_rcu(&grp->rcu, vlan_rcu_free);
 274
 275                                 grp = NULL;
 276                                 ret = 1;
 277                         }
 278                 }
 279         }
 280
 281         return ret;
 282 }
 283
 284 static int unregister_vlan_device(const char *vlan_IF_name)
 285 {
 286         struct net_device *dev = NULL;
 287         int ret;
 288
 289
 290         dev = dev_get_by_name(vlan_IF_name);
 291         ret = -EINVAL;
 292         if (dev) {
 293                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
 294                         rtnl_lock();
 295
 296                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
 297                                                   VLAN_DEV_INFO(dev)->vlan_id);
 298
 299                         dev_put(dev);
 300                         unregister_netdevice(dev);
 301
 302                         rtnl_unlock();
 303
 304                         if (ret == 1)
 305                                 ret = 0;
 306                 } else {
 307                         printk(VLAN_ERR
 308                                "%s: ERROR:      Tried to remove a non-vlan device "
 309                                "with VLAN code, name: %s  priv_flags: %hX\n",
 310                                __FUNCTION__, dev->name, dev->priv_flags);
 311                         dev_put(dev);
 312                         ret = -EPERM;
 313                 }
 314         } else {
 315 #ifdef VLAN_DEBUG
 316                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
 317 #endif
 318                 ret = -EINVAL;
 319         }
 320
 321         return ret;
 322 }
 323
 324 static void vlan_setup(struct net_device *new_dev)
 325 {
 326         SET_MODULE_OWNER(new_dev);
 327
 328         /* new_dev->ifindex = 0;  it will be set when added to
 329          * the global list.
 330          * iflink is set as well.
 331          */
 332         new_dev->get_stats = vlan_dev_get_stats;
 333
 334         /* Make this thing known as a VLAN device */
 335         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 336
 337         /* Set us up to have no queue, as the underlying Hardware device
 338          * can do all the queueing we could want.
 339          */
 340         new_dev->tx_queue_len = 0;
 341
 342         /* set up method calls */
 343         new_dev->change_mtu = vlan_dev_change_mtu;
 344         new_dev->open = vlan_dev_open;
 345         new_dev->stop = vlan_dev_stop;
 346         new_dev->set_mac_address = vlan_dev_set_mac_address;
 347         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 348         new_dev->destructor = free_netdev;
 349         new_dev->do_ioctl = vlan_dev_ioctl;
 350 }
 351
 352 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 353 {
 354         /* Have to respect userspace enforced dormant state
 355          * of real device, also must allow supplicant running
 356          * on VLAN device
 357          */
 358         if (dev->operstate == IF_OPER_DORMANT)
 359                 netif_dormant_on(vlandev);
 360         else
 361                 netif_dormant_off(vlandev);
 362
 363         if (netif_carrier_ok(dev)) {
 364                 if (!netif_carrier_ok(vlandev))
 365                         netif_carrier_on(vlandev);
 366         } else {
 367                 if (netif_carrier_ok(vlandev))
 368                         netif_carrier_off(vlandev);
 369         }
 370 }
 371
 372 /*
 373  * vlan network devices have devices nesting below it, and are a special
 374  * "super class" of normal network devices; split their locks off into a
 375  * separate class since they always nest.
 376  */
 377 static struct lock_class_key vlan_netdev_xmit_lock_key;
 378
 379
 380 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 381  *  Returns the device that was created, or NULL if there was
 382  *  an error of some kind.
 383  */
 384 static struct net_device *register_vlan_device(const char *eth_IF_name,
 385                                                unsigned short VLAN_ID)
 386 {
 387         struct vlan_group *grp;
 388         struct net_device *new_dev;
 389         struct net_device *real_dev; /* the ethernet device */
 390         char name[IFNAMSIZ];
 391         int i;
 392
 393 #ifdef VLAN_DEBUG
 394         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 395                 __FUNCTION__, eth_IF_name, VLAN_ID);
 396 #endif
 397
 398         if (VLAN_ID >= VLAN_VID_MASK)
 399                 goto out_ret_null;
 400
 401         /* find the device relating to eth_IF_name. */
 402         real_dev = dev_get_by_name(eth_IF_name);
 403         if (!real_dev)
 404                 goto out_ret_null;
 405
 406         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 407                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 408                         __FUNCTION__, real_dev->name);
 409                 goto out_put_dev;
 410         }
 411
 412         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 413             (real_dev->vlan_rx_register == NULL ||
 414              real_dev->vlan_rx_kill_vid == NULL)) {
 415                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 416                         __FUNCTION__, real_dev->name);
 417                 goto out_put_dev;
 418         }
 419
 420         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 421             (real_dev->vlan_rx_add_vid == NULL ||
 422              real_dev->vlan_rx_kill_vid == NULL)) {
 423                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 424                         __FUNCTION__, real_dev->name);
 425                 goto out_put_dev;
 426         }
 427
 428         /* From this point on, all the data structures must remain
 429          * consistent.
 430          */
 431         rtnl_lock();
 432
 433         /* The real device must be up and operating in order to
 434          * assosciate a VLAN device with it.
 435          */
 436         if (!(real_dev->flags & IFF_UP))
 437                 goto out_unlock;
 438
 439         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
 440                 /* was already registered. */
 441                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 442                 goto out_unlock;
 443         }
 444
 445         /* Gotta set up the fields for the device. */
 446 #ifdef VLAN_DEBUG
 447         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 448                vlan_name_type);
 449 #endif
 450         switch (vlan_name_type) {
 451         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 452                 /* name will look like:  eth1.0005 */
 453                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 454                 break;
 455         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 456                 /* Put our vlan.VID in the name.
 457                  * Name will look like:  vlan5
 458                  */
 459                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 460                 break;
 461         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 462                 /* Put our vlan.VID in the name.
 463                  * Name will look like:  eth0.5
 464                  */
 465                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 466                 break;
 467         case VLAN_NAME_TYPE_PLUS_VID:
 468                 /* Put our vlan.VID in the name.
 469                  * Name will look like:  vlan0005
 470                  */
 471         default:
 472                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 473         }
 474
 475         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 476                                vlan_setup);
 477
 478         if (new_dev == NULL)
 479                 goto out_unlock;
 480
 481 #ifdef VLAN_DEBUG
 482         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 483 #endif
 484         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 485         new_dev->flags = real_dev->flags;
 486         new_dev->flags &= ~IFF_UP;
 487
 488         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 489                                              (1<<__LINK_STATE_DORMANT))) |
 490                          (1<<__LINK_STATE_PRESENT);
 491
 492         /* need 4 bytes for extra VLAN header info,
 493          * hope the underlying device can handle it.
 494          */
 495         new_dev->mtu = real_dev->mtu;
 496
 497         /* TODO: maybe just assign it to be ETHERNET? */
 498         new_dev->type = real_dev->type;
 499
 500         new_dev->hard_header_len = real_dev->hard_header_len;
 501         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
 502                 /* Regular ethernet + 4 bytes (18 total). */
 503                 new_dev->hard_header_len += VLAN_HLEN;
 504         }
 505
 506         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 507                      new_dev->priv,
 508                      sizeof(struct vlan_dev_info));
 509
 510         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
 511         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
 512         new_dev->addr_len = real_dev->addr_len;
 513
 514         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 515                 new_dev->hard_header = real_dev->hard_header;
 516                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 517                 new_dev->rebuild_header = real_dev->rebuild_header;
 518         } else {
 519                 new_dev->hard_header = vlan_dev_hard_header;
 520                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 521                 new_dev->rebuild_header = vlan_dev_rebuild_header;
 522         }
 523         new_dev->hard_header_parse = real_dev->hard_header_parse;
 524
 525         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 526         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 527         VLAN_DEV_INFO(new_dev)->dent = NULL;
 528         VLAN_DEV_INFO(new_dev)->flags = 1;
 529
 530 #ifdef VLAN_DEBUG
 531         printk(VLAN_DBG "About to go find the group for idx: %i\n",
 532                real_dev->ifindex);
 533 #endif
 534
 535         if (register_netdevice(new_dev))
 536                 goto out_free_newdev;
 537
 538         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 539
 540         new_dev->iflink = real_dev->ifindex;
 541         vlan_transfer_operstate(real_dev, new_dev);
 542         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
 543
 544         /* So, got the sucker initialized, now lets place
 545          * it into our local structure.
 546          */
 547         grp = __vlan_find_group(real_dev->ifindex);
 548
 549         /* Note, we are running under the RTNL semaphore
 550          * so it cannot "appear" on us.
 551          */
 552         if (!grp) { /* need to add a new group */
 553                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 554                 if (!grp)
 555                         goto out_free_unregister;
 556
 557                 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
 558                         grp->vlan_devices_arrays[i] = kzalloc(
 559                                 sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
 560                                 GFP_KERNEL);
 561
 562                         if (!grp->vlan_devices_arrays[i])
 563                                 goto out_free_arrays;
 564                 }
 565
 566                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
 567                 grp->real_dev_ifindex = real_dev->ifindex;
 568
 569                 hlist_add_head_rcu(&grp->hlist,
 570                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
 571
 572                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
 573                         real_dev->vlan_rx_register(real_dev, grp);
 574         }
 575
 576         vlan_group_set_device(grp, VLAN_ID, new_dev);
 577
 578         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
 579                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 580                                                          new_dev->name);
 581
 582         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 583                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
 584
 585         rtnl_unlock();
 586
 587
 588 #ifdef VLAN_DEBUG
 589         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 590 #endif
 591         return new_dev;
 592
 593 out_free_arrays:
 594         vlan_group_free(grp);
 595
 596 out_free_unregister:
 597         unregister_netdev(new_dev);
 598         goto out_unlock;
 599
 600 out_free_newdev:
 601         free_netdev(new_dev);
 602
 603 out_unlock:
 604         rtnl_unlock();
 605
 606 out_put_dev:
 607         dev_put(real_dev);
 608
 609 out_ret_null:
 610         return NULL;
 611 }
 612
 613 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 614 {
 615         struct net_device *dev = ptr;
 616         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 617         int i, flgs;
 618         struct net_device *vlandev;
 619
 620         if (!grp)
 621                 goto out;
 622
 623         /* It is OK that we do not hold the group lock right now,
 624          * as we run under the RTNL lock.
 625          */
 626
 627         switch (event) {
 628         case NETDEV_CHANGE:
 629                 /* Propagate real device state to vlan devices */
 630                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 631                         vlandev = vlan_group_get_device(grp, i);
 632                         if (!vlandev)
 633                                 continue;
 634
 635                         vlan_transfer_operstate(dev, vlandev);
 636                 }
 637                 break;
 638
 639         case NETDEV_DOWN:
 640                 /* Put all VLANs for this dev in the down state too.  */
 641                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 642                         vlandev = vlan_group_get_device(grp, i);
 643                         if (!vlandev)
 644                                 continue;
 645
 646                         flgs = vlandev->flags;
 647                         if (!(flgs & IFF_UP))
 648                                 continue;
 649
 650                         dev_change_flags(vlandev, flgs & ~IFF_UP);
 651                 }
 652                 break;
 653
 654         case NETDEV_UP:
 655                 /* Put all VLANs for this dev in the up state too.  */
 656                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 657                         vlandev = vlan_group_get_device(grp, i);
 658                         if (!vlandev)
 659                                 continue;
 660
 661                         flgs = vlandev->flags;
 662                         if (flgs & IFF_UP)
 663                                 continue;
 664
 665                         dev_change_flags(vlandev, flgs | IFF_UP);
 666                 }
 667                 break;
 668
 669         case NETDEV_UNREGISTER:
 670                 /* Delete all VLANs for this dev. */
 671                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 672                         int ret;
 673
 674                         vlandev = vlan_group_get_device(grp, i);
 675                         if (!vlandev)
 676                                 continue;
 677
 678                         ret = unregister_vlan_dev(dev,
 679                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
 680
 681                         unregister_netdevice(vlandev);
 682
 683                         /* Group was destroyed? */
 684                         if (ret == 1)
 685                                 break;
 686                 }
 687                 break;
 688         }
 689
 690 out:
 691         return NOTIFY_DONE;
 692 }
 693
 694 /*
 695  *      VLAN IOCTL handler.
 696  *      o execute requested action or pass command to the device driver
 697  *   arg is really a struct vlan_ioctl_args __user *.
 698  */
 699 static int vlan_ioctl_handler(void __user *arg)
 700 {
 701         int err = 0;
 702         unsigned short vid = 0;
 703         struct vlan_ioctl_args args;
 704
 705         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
 706                 return -EFAULT;
 707
 708         /* Null terminate this sucker, just in case. */
 709         args.device1[23] = 0;
 710         args.u.device2[23] = 0;
 711
 712 #ifdef VLAN_DEBUG
 713         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
 714 #endif
 715
 716         switch (args.cmd) {
 717         case SET_VLAN_INGRESS_PRIORITY_CMD:
 718                 if (!capable(CAP_NET_ADMIN))
 719                         return -EPERM;
 720                 err = vlan_dev_set_ingress_priority(args.device1,
 721                                                     args.u.skb_priority,
 722                                                     args.vlan_qos);
 723                 break;
 724
 725         case SET_VLAN_EGRESS_PRIORITY_CMD:
 726                 if (!capable(CAP_NET_ADMIN))
 727                         return -EPERM;
 728                 err = vlan_dev_set_egress_priority(args.device1,
 729                                                    args.u.skb_priority,
 730                                                    args.vlan_qos);
 731                 break;
 732
 733         case SET_VLAN_FLAG_CMD:
 734                 if (!capable(CAP_NET_ADMIN))
 735                         return -EPERM;
 736                 err = vlan_dev_set_vlan_flag(args.device1,
 737                                              args.u.flag,
 738                                              args.vlan_qos);
 739                 break;
 740
 741         case SET_VLAN_NAME_TYPE_CMD:
 742                 if (!capable(CAP_NET_ADMIN))
 743                         return -EPERM;
 744                 if ((args.u.name_type >= 0) &&
 745                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 746                         vlan_name_type = args.u.name_type;
 747                         err = 0;
 748                 } else {
 749                         err = -EINVAL;
 750                 }
 751                 break;
 752
 753         case ADD_VLAN_CMD:
 754                 if (!capable(CAP_NET_ADMIN))
 755                         return -EPERM;
 756                 /* we have been given the name of the Ethernet Device we want to
 757                  * talk to:  args.dev1   We also have the
 758                  * VLAN ID:  args.u.VID
 759                  */
 760                 if (register_vlan_device(args.device1, args.u.VID)) {
 761                         err = 0;
 762                 } else {
 763                         err = -EINVAL;
 764                 }
 765                 break;
 766
 767         case DEL_VLAN_CMD:
 768                 if (!capable(CAP_NET_ADMIN))
 769                         return -EPERM;
 770                 /* Here, the args.dev1 is the actual VLAN we want
 771                  * to get rid of.
 772                  */
 773                 err = unregister_vlan_device(args.device1);
 774                 break;
 775
 776         case GET_VLAN_INGRESS_PRIORITY_CMD:
 777                 /* TODO:  Implement
 778                    err = vlan_dev_get_ingress_priority(args);
 779                    if (copy_to_user((void*)arg, &args,
 780                         sizeof(struct vlan_ioctl_args))) {
 781                         err = -EFAULT;
 782                    }
 783                 */
 784                 err = -EINVAL;
 785                 break;
 786         case GET_VLAN_EGRESS_PRIORITY_CMD:
 787                 /* TODO:  Implement
 788                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 789                    if (copy_to_user((void*)arg, &args,
 790                         sizeof(struct vlan_ioctl_args))) {
 791                         err = -EFAULT;
 792                    }
 793                 */
 794                 err = -EINVAL;
 795                 break;
 796         case GET_VLAN_REALDEV_NAME_CMD:
 797                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
 798                 if (err)
 799                         goto out;
 800                 if (copy_to_user(arg, &args,
 801                                  sizeof(struct vlan_ioctl_args))) {
 802                         err = -EFAULT;
 803                 }
 804                 break;
 805
 806         case GET_VLAN_VID_CMD:
 807                 err = vlan_dev_get_vid(args.device1, &vid);
 808                 if (err)
 809                         goto out;
 810                 args.u.VID = vid;
 811                 if (copy_to_user(arg, &args,
 812                                  sizeof(struct vlan_ioctl_args))) {
 813                       err = -EFAULT;
 814                 }
 815                 break;
 816
 817         default:
 818                 /* pass on to underlying device instead?? */
 819                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 820                         __FUNCTION__, args.cmd);
 821                 return -EINVAL;
 822         }
 823 out:
 824         return err;
 825 }
 826
 827 MODULE_LICENSE("GPL");
 828 MODULE_VERSION(DRV_VERSION);