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