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