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