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 %s: can't create entry in proc filesystem!\n",
  93                        __FUNCTION__, VLAN_NAME);
  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_netlink_fini();
 128         vlan_ioctl_set(NULL);
 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 /*
 311  * vlan network devices have devices nesting below it, and are a special
 312  * "super class" of normal network devices; split their locks off into a
 313  * separate class since they always nest.
 314  */
 315 static struct lock_class_key vlan_netdev_xmit_lock_key;
 316
 317 static int vlan_dev_init(struct net_device *dev)
 318 {
 319         struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
 320
 321         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
 322         dev->flags  = real_dev->flags & ~IFF_UP;
 323         dev->iflink = real_dev->ifindex;
 324         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
 325                                           (1<<__LINK_STATE_DORMANT))) |
 326                       (1<<__LINK_STATE_PRESENT);
 327
 328         if (is_zero_ether_addr(dev->dev_addr))
 329                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
 330         if (is_zero_ether_addr(dev->broadcast))
 331                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 332
 333         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
 334                 dev->hard_header     = real_dev->hard_header;
 335                 dev->hard_header_len = real_dev->hard_header_len;
 336                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
 337                 dev->rebuild_header  = real_dev->rebuild_header;
 338         } else {
 339                 dev->hard_header     = vlan_dev_hard_header;
 340                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
 341                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
 342                 dev->rebuild_header  = vlan_dev_rebuild_header;
 343         }
 344         dev->hard_header_parse = real_dev->hard_header_parse;
 345         dev->hard_header_cache = NULL;
 346
 347         lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
 348         return 0;
 349 }
 350
 351 void vlan_setup(struct net_device *new_dev)
 352 {
 353         ether_setup(new_dev);
 354
 355         /* new_dev->ifindex = 0;  it will be set when added to
 356          * the global list.
 357          * iflink is set as well.
 358          */
 359         new_dev->get_stats = vlan_dev_get_stats;
 360
 361         /* Make this thing known as a VLAN device */
 362         new_dev->priv_flags |= IFF_802_1Q_VLAN;
 363
 364         /* Set us up to have no queue, as the underlying Hardware device
 365          * can do all the queueing we could want.
 366          */
 367         new_dev->tx_queue_len = 0;
 368
 369         /* set up method calls */
 370         new_dev->change_mtu = vlan_dev_change_mtu;
 371         new_dev->init = vlan_dev_init;
 372         new_dev->open = vlan_dev_open;
 373         new_dev->stop = vlan_dev_stop;
 374         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
 375         new_dev->change_rx_flags = vlan_change_rx_flags;
 376         new_dev->destructor = free_netdev;
 377         new_dev->do_ioctl = vlan_dev_ioctl;
 378
 379         memset(new_dev->broadcast, 0, ETH_ALEN);
 380 }
 381
 382 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
 383 {
 384         /* Have to respect userspace enforced dormant state
 385          * of real device, also must allow supplicant running
 386          * on VLAN device
 387          */
 388         if (dev->operstate == IF_OPER_DORMANT)
 389                 netif_dormant_on(vlandev);
 390         else
 391                 netif_dormant_off(vlandev);
 392
 393         if (netif_carrier_ok(dev)) {
 394                 if (!netif_carrier_ok(vlandev))
 395                         netif_carrier_on(vlandev);
 396         } else {
 397                 if (netif_carrier_ok(vlandev))
 398                         netif_carrier_off(vlandev);
 399         }
 400 }
 401
 402 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
 403 {
 404         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
 405                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
 406                         __FUNCTION__, real_dev->name);
 407                 return -EOPNOTSUPP;
 408         }
 409
 410         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
 411             !real_dev->vlan_rx_register) {
 412                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 413                         __FUNCTION__, real_dev->name);
 414                 return -EOPNOTSUPP;
 415         }
 416
 417         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
 418             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
 419                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
 420                         __FUNCTION__, real_dev->name);
 421                 return -EOPNOTSUPP;
 422         }
 423
 424         /* The real device must be up and operating in order to
 425          * assosciate a VLAN device with it.
 426          */
 427         if (!(real_dev->flags & IFF_UP))
 428                 return -ENETDOWN;
 429
 430         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
 431                 /* was already registered. */
 432                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
 433                 return -EEXIST;
 434         }
 435
 436         return 0;
 437 }
 438
 439 int register_vlan_dev(struct net_device *dev)
 440 {
 441         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
 442         struct net_device *real_dev = vlan->real_dev;
 443         unsigned short vlan_id = vlan->vlan_id;
 444         struct vlan_group *grp, *ngrp = NULL;
 445         int err;
 446
 447         grp = __vlan_find_group(real_dev->ifindex);
 448         if (!grp) {
 449                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
 450                 if (!grp)
 451                         return -ENOBUFS;
 452         }
 453
 454         err = register_netdevice(dev);
 455         if (err < 0)
 456                 goto out_free_group;
 457
 458         /* Account for reference in struct vlan_dev_info */
 459         dev_hold(real_dev);
 460
 461         vlan_transfer_operstate(real_dev, dev);
 462         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
 463
 464         /* So, got the sucker initialized, now lets place
 465          * it into our local structure.
 466          */
 467         vlan_group_set_device(grp, vlan_id, dev);
 468         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
 469                 real_dev->vlan_rx_register(real_dev, ngrp);
 470         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
 471                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
 472
 473         if (vlan_proc_add_dev(dev) < 0)
 474                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
 475                        dev->name);
 476         return 0;
 477
 478 out_free_group:
 479         if (ngrp)
 480                 vlan_group_free(ngrp);
 481         return err;
 482 }
 483
 484 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
 485  *  Returns 0 if the device was created or a negative error code otherwise.
 486  */
 487 static int register_vlan_device(struct net_device *real_dev,
 488                                 unsigned short VLAN_ID)
 489 {
 490         struct net_device *new_dev;
 491         char name[IFNAMSIZ];
 492         int err;
 493
 494 #ifdef VLAN_DEBUG
 495         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
 496                 __FUNCTION__, eth_IF_name, VLAN_ID);
 497 #endif
 498
 499         if (VLAN_ID >= VLAN_VID_MASK)
 500                 return -ERANGE;
 501
 502         err = vlan_check_real_dev(real_dev, VLAN_ID);
 503         if (err < 0)
 504                 return err;
 505
 506         /* Gotta set up the fields for the device. */
 507 #ifdef VLAN_DEBUG
 508         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
 509                vlan_name_type);
 510 #endif
 511         switch (vlan_name_type) {
 512         case VLAN_NAME_TYPE_RAW_PLUS_VID:
 513                 /* name will look like:  eth1.0005 */
 514                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
 515                 break;
 516         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
 517                 /* Put our vlan.VID in the name.
 518                  * Name will look like:  vlan5
 519                  */
 520                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
 521                 break;
 522         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
 523                 /* Put our vlan.VID in the name.
 524                  * Name will look like:  eth0.5
 525                  */
 526                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
 527                 break;
 528         case VLAN_NAME_TYPE_PLUS_VID:
 529                 /* Put our vlan.VID in the name.
 530                  * Name will look like:  vlan0005
 531                  */
 532         default:
 533                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
 534         }
 535
 536         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
 537                                vlan_setup);
 538
 539         if (new_dev == NULL)
 540                 return -ENOBUFS;
 541
 542         /* need 4 bytes for extra VLAN header info,
 543          * hope the underlying device can handle it.
 544          */
 545         new_dev->mtu = real_dev->mtu;
 546
 547 #ifdef VLAN_DEBUG
 548         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
 549         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
 550                      new_dev->priv,
 551                      sizeof(struct vlan_dev_info));
 552 #endif
 553
 554         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
 555         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
 556         VLAN_DEV_INFO(new_dev)->dent = NULL;
 557         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 558
 559         new_dev->rtnl_link_ops = &vlan_link_ops;
 560         err = register_vlan_dev(new_dev);
 561         if (err < 0)
 562                 goto out_free_newdev;
 563
 564 #ifdef VLAN_DEBUG
 565         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
 566 #endif
 567         return 0;
 568
 569 out_free_newdev:
 570         free_netdev(new_dev);
 571         return err;
 572 }
 573
 574 static void vlan_sync_address(struct net_device *dev,
 575                               struct net_device *vlandev)
 576 {
 577         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
 578
 579         /* May be called without an actual change */
 580         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
 581                 return;
 582
 583         /* vlan address was different from the old address and is equal to
 584          * the new address */
 585         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 586             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 587                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
 588
 589         /* vlan address was equal to the old address and is different from
 590          * the new address */
 591         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
 592             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
 593                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
 594
 595         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 596 }
 597
 598 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
 599 {
 600         struct net_device *dev = ptr;
 601         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
 602         int i, flgs;
 603         struct net_device *vlandev;
 604
 605         if (dev->nd_net != &init_net)
 606                 return NOTIFY_DONE;
 607
 608         if (!grp)
 609                 goto out;
 610
 611         /* It is OK that we do not hold the group lock right now,
 612          * as we run under the RTNL lock.
 613          */
 614
 615         switch (event) {
 616         case NETDEV_CHANGE:
 617                 /* Propagate real device state to vlan devices */
 618                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
 619                         vlandev = vlan_group_get_device(grp, i);
 620                         if (!vlandev)
 621                                 continue;
 622
 623                         vlan_transfer_operstate(dev, vlandev);
 624                 }
 625                 break;
 626
 627         case NETDEV_CHANGEADDR:
 628                 /* Adjust unicast filters on underlying device */
 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_sync_address(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(struct net *net, void __user *arg)
 699 {
 700         int err;
 701         unsigned short vid = 0;
 702         struct vlan_ioctl_args args;
 703         struct net_device *dev = NULL;
 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         rtnl_lock();
 717
 718         switch (args.cmd) {
 719         case SET_VLAN_INGRESS_PRIORITY_CMD:
 720         case SET_VLAN_EGRESS_PRIORITY_CMD:
 721         case SET_VLAN_FLAG_CMD:
 722         case ADD_VLAN_CMD:
 723         case DEL_VLAN_CMD:
 724         case GET_VLAN_REALDEV_NAME_CMD:
 725         case GET_VLAN_VID_CMD:
 726                 err = -ENODEV;
 727                 dev = __dev_get_by_name(&init_net, args.device1);
 728                 if (!dev)
 729                         goto out;
 730
 731                 err = -EINVAL;
 732                 if (args.cmd != ADD_VLAN_CMD &&
 733                     !(dev->priv_flags & IFF_802_1Q_VLAN))
 734                         goto out;
 735         }
 736
 737         switch (args.cmd) {
 738         case SET_VLAN_INGRESS_PRIORITY_CMD:
 739                 err = -EPERM;
 740                 if (!capable(CAP_NET_ADMIN))
 741                         break;
 742                 vlan_dev_set_ingress_priority(dev,
 743                                               args.u.skb_priority,
 744                                               args.vlan_qos);
 745                 break;
 746
 747         case SET_VLAN_EGRESS_PRIORITY_CMD:
 748                 err = -EPERM;
 749                 if (!capable(CAP_NET_ADMIN))
 750                         break;
 751                 err = vlan_dev_set_egress_priority(dev,
 752                                                    args.u.skb_priority,
 753                                                    args.vlan_qos);
 754                 break;
 755
 756         case SET_VLAN_FLAG_CMD:
 757                 err = -EPERM;
 758                 if (!capable(CAP_NET_ADMIN))
 759                         break;
 760                 err = vlan_dev_set_vlan_flag(dev,
 761                                              args.u.flag,
 762                                              args.vlan_qos);
 763                 break;
 764
 765         case SET_VLAN_NAME_TYPE_CMD:
 766                 err = -EPERM;
 767                 if (!capable(CAP_NET_ADMIN))
 768                         return -EPERM;
 769                 if ((args.u.name_type >= 0) &&
 770                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
 771                         vlan_name_type = args.u.name_type;
 772                         err = 0;
 773                 } else {
 774                         err = -EINVAL;
 775                 }
 776                 break;
 777
 778         case ADD_VLAN_CMD:
 779                 err = -EPERM;
 780                 if (!capable(CAP_NET_ADMIN))
 781                         break;
 782                 err = register_vlan_device(dev, args.u.VID);
 783                 break;
 784
 785         case DEL_VLAN_CMD:
 786                 err = -EPERM;
 787                 if (!capable(CAP_NET_ADMIN))
 788                         break;
 789                 err = unregister_vlan_device(dev);
 790                 break;
 791
 792         case GET_VLAN_INGRESS_PRIORITY_CMD:
 793                 /* TODO:  Implement
 794                    err = vlan_dev_get_ingress_priority(args);
 795                    if (copy_to_user((void*)arg, &args,
 796                         sizeof(struct vlan_ioctl_args))) {
 797                         err = -EFAULT;
 798                    }
 799                 */
 800                 err = -EINVAL;
 801                 break;
 802         case GET_VLAN_EGRESS_PRIORITY_CMD:
 803                 /* TODO:  Implement
 804                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
 805                    if (copy_to_user((void*)arg, &args,
 806                         sizeof(struct vlan_ioctl_args))) {
 807                         err = -EFAULT;
 808                    }
 809                 */
 810                 err = -EINVAL;
 811                 break;
 812         case GET_VLAN_REALDEV_NAME_CMD:
 813                 err = 0;
 814                 vlan_dev_get_realdev_name(dev, args.u.device2);
 815                 if (copy_to_user(arg, &args,
 816                                  sizeof(struct vlan_ioctl_args))) {
 817                         err = -EFAULT;
 818                 }
 819                 break;
 820
 821         case GET_VLAN_VID_CMD:
 822                 err = 0;
 823                 vlan_dev_get_vid(dev, &vid);
 824                 args.u.VID = vid;
 825                 if (copy_to_user(arg, &args,
 826                                  sizeof(struct vlan_ioctl_args))) {
 827                       err = -EFAULT;
 828                 }
 829                 break;
 830
 831         default:
 832                 /* pass on to underlying device instead?? */
 833                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
 834                         __FUNCTION__, args.cmd);
 835                 err = -EINVAL;
 836                 break;
 837         }
 838 out:
 839         rtnl_unlock();
 840         return err;
 841 }
 842
 843 MODULE_LICENSE("GPL");
 844 MODULE_VERSION(DRV_VERSION);