Merge branch 'master' into 83xx
[linux-2.6] / net / 8021q / vlan.c
1 /*
2  * INET         802.1Q VLAN
3  *              Ethernet-type device handling.
4  *
5  * Authors:     Ben Greear <greearb@candelatech.com>
6  *              Please send support related email to: vlan@scry.wanfear.com
7  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
8  *
9  * Fixes:
10  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
11  *              Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
12  *              Correct all the locking - David S. Miller <davem@redhat.com>;
13  *              Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
14  *
15  *              This program is free software; you can redistribute it and/or
16  *              modify it under the terms of the GNU General Public License
17  *              as published by the Free Software Foundation; either version
18  *              2 of the License, or (at your option) any later version.
19  */
20
21 #include <asm/uaccess.h> /* for copy_from_user */
22 #include <linux/capability.h>
23 #include <linux/module.h>
24 #include <linux/netdevice.h>
25 #include <linux/skbuff.h>
26 #include <net/datalink.h>
27 #include <linux/mm.h>
28 #include <linux/in.h>
29 #include <linux/init.h>
30 #include <net/p8022.h>
31 #include <net/arp.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/notifier.h>
34
35 #include <linux/if_vlan.h>
36 #include "vlan.h"
37 #include "vlanproc.h"
38
39 #define DRV_VERSION "1.8"
40
41 /* Global VLAN variables */
42
43 /* Our listing of VLAN group(s) */
44 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
45 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
46
47 static char vlan_fullname[] = "802.1Q VLAN Support";
48 static char vlan_version[] = DRV_VERSION;
49 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
50 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
51
52 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
53 static int vlan_ioctl_handler(void __user *);
54 static int unregister_vlan_dev(struct net_device *, unsigned short );
55
56 static struct notifier_block vlan_notifier_block = {
57         .notifier_call = vlan_device_event,
58 };
59
60 /* These may be changed at run-time through IOCTLs */
61
62 /* Determines interface naming scheme. */
63 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
64
65 static struct packet_type vlan_packet_type = {
66         .type = __constant_htons(ETH_P_8021Q),
67         .func = vlan_skb_recv, /* VLAN receive method */
68 };
69
70 /* End of global variables definitions. */
71
72 /*
73  * Function vlan_proto_init (pro)
74  *
75  *    Initialize VLAN protocol layer,
76  *
77  */
78 static int __init vlan_proto_init(void)
79 {
80         int err;
81
82         printk(VLAN_INF "%s v%s %s\n",
83                vlan_fullname, vlan_version, vlan_copyright);
84         printk(VLAN_INF "All bugs added by %s\n",
85                vlan_buggyright);
86
87         /* proc file system initialization */
88         err = vlan_proc_init();
89         if (err < 0) {
90                 printk(KERN_ERR
91                        "%s %s: can't create entry in proc filesystem!\n",
92                        __FUNCTION__, VLAN_NAME);
93                 return err;
94         }
95
96         dev_add_pack(&vlan_packet_type);
97
98         /* Register us to receive netdevice events */
99         err = register_netdevice_notifier(&vlan_notifier_block);
100         if (err < 0) {
101                 dev_remove_pack(&vlan_packet_type);
102                 vlan_proc_cleanup();
103                 return err;
104         }
105
106         vlan_ioctl_set(vlan_ioctl_handler);
107
108         return 0;
109 }
110
111 /* Cleanup all vlan devices
112  * Note: devices that have been registered that but not
113  * brought up will exist but have no module ref count.
114  */
115 static void __exit vlan_cleanup_devices(void)
116 {
117         struct net_device *dev, *nxt;
118
119         rtnl_lock();
120         for (dev = dev_base; dev; dev = nxt) {
121                 nxt = dev->next;
122                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
123                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
124                                             VLAN_DEV_INFO(dev)->vlan_id);
125
126                         unregister_netdevice(dev);
127                 }
128         }
129         rtnl_unlock();
130 }
131
132 /*
133  *     Module 'remove' entry point.
134  *     o delete /proc/net/router directory and static entries.
135  */
136 static void __exit vlan_cleanup_module(void)
137 {
138         int i;
139
140         vlan_ioctl_set(NULL);
141
142         /* Un-register us from receiving netdevice events */
143         unregister_netdevice_notifier(&vlan_notifier_block);
144
145         dev_remove_pack(&vlan_packet_type);
146         vlan_cleanup_devices();
147
148         /* This table must be empty if there are no module
149          * references left.
150          */
151         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
152                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
153         }
154         vlan_proc_cleanup();
155
156         synchronize_net();
157 }
158
159 module_init(vlan_proto_init);
160 module_exit(vlan_cleanup_module);
161
162 /* Must be invoked with RCU read lock (no preempt) */
163 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
164 {
165         struct vlan_group *grp;
166         struct hlist_node *n;
167         int hash = vlan_grp_hashfn(real_dev_ifindex);
168
169         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
170                 if (grp->real_dev_ifindex == real_dev_ifindex)
171                         return grp;
172         }
173
174         return NULL;
175 }
176
177 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
178  *
179  * Must be invoked with RCU read lock (no preempt)
180  */
181 struct net_device *__find_vlan_dev(struct net_device *real_dev,
182                                    unsigned short VID)
183 {
184         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
185
186         if (grp)
187                 return grp->vlan_devices[VID];
188
189         return NULL;
190 }
191
192 static void vlan_rcu_free(struct rcu_head *rcu)
193 {
194         kfree(container_of(rcu, struct vlan_group, rcu));
195 }
196
197
198 /* This returns 0 if everything went fine.
199  * It will return 1 if the group was killed as a result.
200  * A negative return indicates failure.
201  *
202  * The RTNL lock must be held.
203  */
204 static int unregister_vlan_dev(struct net_device *real_dev,
205                                unsigned short vlan_id)
206 {
207         struct net_device *dev = NULL;
208         int real_dev_ifindex = real_dev->ifindex;
209         struct vlan_group *grp;
210         int i, ret;
211
212 #ifdef VLAN_DEBUG
213         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
214 #endif
215
216         /* sanity check */
217         if (vlan_id >= VLAN_VID_MASK)
218                 return -EINVAL;
219
220         ASSERT_RTNL();
221         grp = __vlan_find_group(real_dev_ifindex);
222
223         ret = 0;
224
225         if (grp) {
226                 dev = grp->vlan_devices[vlan_id];
227                 if (dev) {
228                         /* Remove proc entry */
229                         vlan_proc_rem_dev(dev);
230
231                         /* Take it out of our own structures, but be sure to
232                          * interlock with HW accelerating devices or SW vlan
233                          * input packet processing.
234                          */
235                         if (real_dev->features &
236                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
237                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
238                         }
239
240                         grp->vlan_devices[vlan_id] = NULL;
241                         synchronize_net();
242
243
244                         /* Caller unregisters (and if necessary, puts)
245                          * VLAN device, but we get rid of the reference to
246                          * real_dev here.
247                          */
248                         dev_put(real_dev);
249
250                         /* If the group is now empty, kill off the
251                          * group.
252                          */
253                         for (i = 0; i < VLAN_VID_MASK; i++)
254                                 if (grp->vlan_devices[i])
255                                         break;
256
257                         if (i == VLAN_VID_MASK) {
258                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
259                                         real_dev->vlan_rx_register(real_dev, NULL);
260
261                                 hlist_del_rcu(&grp->hlist);
262
263                                 /* Free the group, after all cpu's are done. */
264                                 call_rcu(&grp->rcu, vlan_rcu_free);
265
266                                 grp = NULL;
267                                 ret = 1;
268                         }
269                 }
270         }
271
272         return ret;
273 }
274
275 static int unregister_vlan_device(const char *vlan_IF_name)
276 {
277         struct net_device *dev = NULL;
278         int ret;
279
280
281         dev = dev_get_by_name(vlan_IF_name);
282         ret = -EINVAL;
283         if (dev) {
284                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
285                         rtnl_lock();
286
287                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
288                                                   VLAN_DEV_INFO(dev)->vlan_id);
289
290                         dev_put(dev);
291                         unregister_netdevice(dev);
292
293                         rtnl_unlock();
294
295                         if (ret == 1)
296                                 ret = 0;
297                 } else {
298                         printk(VLAN_ERR
299                                "%s: ERROR:      Tried to remove a non-vlan device "
300                                "with VLAN code, name: %s  priv_flags: %hX\n",
301                                __FUNCTION__, dev->name, dev->priv_flags);
302                         dev_put(dev);
303                         ret = -EPERM;
304                 }
305         } else {
306 #ifdef VLAN_DEBUG
307                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
308 #endif
309                 ret = -EINVAL;
310         }
311
312         return ret;
313 }
314
315 static void vlan_setup(struct net_device *new_dev)
316 {
317         SET_MODULE_OWNER(new_dev);
318
319         /* new_dev->ifindex = 0;  it will be set when added to
320          * the global list.
321          * iflink is set as well.
322          */
323         new_dev->get_stats = vlan_dev_get_stats;
324
325         /* Make this thing known as a VLAN device */
326         new_dev->priv_flags |= IFF_802_1Q_VLAN;
327
328         /* Set us up to have no queue, as the underlying Hardware device
329          * can do all the queueing we could want.
330          */
331         new_dev->tx_queue_len = 0;
332
333         /* set up method calls */
334         new_dev->change_mtu = vlan_dev_change_mtu;
335         new_dev->open = vlan_dev_open;
336         new_dev->stop = vlan_dev_stop;
337         new_dev->set_mac_address = vlan_dev_set_mac_address;
338         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
339         new_dev->destructor = free_netdev;
340         new_dev->do_ioctl = vlan_dev_ioctl;
341 }
342
343 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
344 {
345         /* Have to respect userspace enforced dormant state
346          * of real device, also must allow supplicant running
347          * on VLAN device
348          */
349         if (dev->operstate == IF_OPER_DORMANT)
350                 netif_dormant_on(vlandev);
351         else
352                 netif_dormant_off(vlandev);
353
354         if (netif_carrier_ok(dev)) {
355                 if (!netif_carrier_ok(vlandev))
356                         netif_carrier_on(vlandev);
357         } else {
358                 if (netif_carrier_ok(vlandev))
359                         netif_carrier_off(vlandev);
360         }
361 }
362
363 /*
364  * vlan network devices have devices nesting below it, and are a special
365  * "super class" of normal network devices; split their locks off into a
366  * separate class since they always nest.
367  */
368 static struct lock_class_key vlan_netdev_xmit_lock_key;
369
370
371 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
372  *  Returns the device that was created, or NULL if there was
373  *  an error of some kind.
374  */
375 static struct net_device *register_vlan_device(const char *eth_IF_name,
376                                                unsigned short VLAN_ID)
377 {
378         struct vlan_group *grp;
379         struct net_device *new_dev;
380         struct net_device *real_dev; /* the ethernet device */
381         char name[IFNAMSIZ];
382
383 #ifdef VLAN_DEBUG
384         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
385                 __FUNCTION__, eth_IF_name, VLAN_ID);
386 #endif
387
388         if (VLAN_ID >= VLAN_VID_MASK)
389                 goto out_ret_null;
390
391         /* find the device relating to eth_IF_name. */
392         real_dev = dev_get_by_name(eth_IF_name);
393         if (!real_dev)
394                 goto out_ret_null;
395
396         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
397                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
398                         __FUNCTION__, real_dev->name);
399                 goto out_put_dev;
400         }
401
402         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
403             (real_dev->vlan_rx_register == NULL ||
404              real_dev->vlan_rx_kill_vid == NULL)) {
405                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
406                         __FUNCTION__, real_dev->name);
407                 goto out_put_dev;
408         }
409
410         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
411             (real_dev->vlan_rx_add_vid == NULL ||
412              real_dev->vlan_rx_kill_vid == NULL)) {
413                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
414                         __FUNCTION__, real_dev->name);
415                 goto out_put_dev;
416         }
417
418         /* From this point on, all the data structures must remain
419          * consistent.
420          */
421         rtnl_lock();
422
423         /* The real device must be up and operating in order to
424          * assosciate a VLAN device with it.
425          */
426         if (!(real_dev->flags & IFF_UP))
427                 goto out_unlock;
428
429         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
430                 /* was already registered. */
431                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
432                 goto out_unlock;
433         }
434
435         /* Gotta set up the fields for the device. */
436 #ifdef VLAN_DEBUG
437         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
438                vlan_name_type);
439 #endif
440         switch (vlan_name_type) {
441         case VLAN_NAME_TYPE_RAW_PLUS_VID:
442                 /* name will look like:  eth1.0005 */
443                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
444                 break;
445         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
446                 /* Put our vlan.VID in the name.
447                  * Name will look like:  vlan5
448                  */
449                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
450                 break;
451         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
452                 /* Put our vlan.VID in the name.
453                  * Name will look like:  eth0.5
454                  */
455                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
456                 break;
457         case VLAN_NAME_TYPE_PLUS_VID:
458                 /* Put our vlan.VID in the name.
459                  * Name will look like:  vlan0005
460                  */
461         default:
462                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
463         };
464
465         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
466                                vlan_setup);
467
468         if (new_dev == NULL)
469                 goto out_unlock;
470
471 #ifdef VLAN_DEBUG
472         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
473 #endif
474         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
475         new_dev->flags = real_dev->flags;
476         new_dev->flags &= ~IFF_UP;
477
478         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
479                                              (1<<__LINK_STATE_DORMANT))) |
480                          (1<<__LINK_STATE_PRESENT);
481
482         /* need 4 bytes for extra VLAN header info,
483          * hope the underlying device can handle it.
484          */
485         new_dev->mtu = real_dev->mtu;
486
487         /* TODO: maybe just assign it to be ETHERNET? */
488         new_dev->type = real_dev->type;
489
490         new_dev->hard_header_len = real_dev->hard_header_len;
491         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
492                 /* Regular ethernet + 4 bytes (18 total). */
493                 new_dev->hard_header_len += VLAN_HLEN;
494         }
495
496         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
497                      new_dev->priv,
498                      sizeof(struct vlan_dev_info));
499
500         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
501         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
502         new_dev->addr_len = real_dev->addr_len;
503
504         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
505                 new_dev->hard_header = real_dev->hard_header;
506                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
507                 new_dev->rebuild_header = real_dev->rebuild_header;
508         } else {
509                 new_dev->hard_header = vlan_dev_hard_header;
510                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
511                 new_dev->rebuild_header = vlan_dev_rebuild_header;
512         }
513         new_dev->hard_header_parse = real_dev->hard_header_parse;
514
515         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
516         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
517         VLAN_DEV_INFO(new_dev)->dent = NULL;
518         VLAN_DEV_INFO(new_dev)->flags = 1;
519
520 #ifdef VLAN_DEBUG
521         printk(VLAN_DBG "About to go find the group for idx: %i\n",
522                real_dev->ifindex);
523 #endif
524
525         if (register_netdevice(new_dev))
526                 goto out_free_newdev;
527
528         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
529
530         new_dev->iflink = real_dev->ifindex;
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         grp = __vlan_find_group(real_dev->ifindex);
538
539         /* Note, we are running under the RTNL semaphore
540          * so it cannot "appear" on us.
541          */
542         if (!grp) { /* need to add a new group */
543                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
544                 if (!grp)
545                         goto out_free_unregister;
546
547                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
548                 grp->real_dev_ifindex = real_dev->ifindex;
549
550                 hlist_add_head_rcu(&grp->hlist,
551                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
552
553                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
554                         real_dev->vlan_rx_register(real_dev, grp);
555         }
556
557         grp->vlan_devices[VLAN_ID] = new_dev;
558
559         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
560                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
561                                                          new_dev->name);
562
563         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
564                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
565
566         rtnl_unlock();
567
568
569 #ifdef VLAN_DEBUG
570         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
571 #endif
572         return new_dev;
573
574 out_free_unregister:
575         unregister_netdev(new_dev);
576         goto out_unlock;
577
578 out_free_newdev:
579         free_netdev(new_dev);
580
581 out_unlock:
582         rtnl_unlock();
583
584 out_put_dev:
585         dev_put(real_dev);
586
587 out_ret_null:
588         return NULL;
589 }
590
591 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
592 {
593         struct net_device *dev = ptr;
594         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
595         int i, flgs;
596         struct net_device *vlandev;
597
598         if (!grp)
599                 goto out;
600
601         /* It is OK that we do not hold the group lock right now,
602          * as we run under the RTNL lock.
603          */
604
605         switch (event) {
606         case NETDEV_CHANGE:
607                 /* Propagate real device state to vlan devices */
608                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
609                         vlandev = grp->vlan_devices[i];
610                         if (!vlandev)
611                                 continue;
612
613                         vlan_transfer_operstate(dev, vlandev);
614                 }
615                 break;
616
617         case NETDEV_DOWN:
618                 /* Put all VLANs for this dev in the down state too.  */
619                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
620                         vlandev = grp->vlan_devices[i];
621                         if (!vlandev)
622                                 continue;
623
624                         flgs = vlandev->flags;
625                         if (!(flgs & IFF_UP))
626                                 continue;
627
628                         dev_change_flags(vlandev, flgs & ~IFF_UP);
629                 }
630                 break;
631
632         case NETDEV_UP:
633                 /* Put all VLANs for this dev in the up state too.  */
634                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
635                         vlandev = grp->vlan_devices[i];
636                         if (!vlandev)
637                                 continue;
638
639                         flgs = vlandev->flags;
640                         if (flgs & IFF_UP)
641                                 continue;
642
643                         dev_change_flags(vlandev, flgs | IFF_UP);
644                 }
645                 break;
646
647         case NETDEV_UNREGISTER:
648                 /* Delete all VLANs for this dev. */
649                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
650                         int ret;
651
652                         vlandev = grp->vlan_devices[i];
653                         if (!vlandev)
654                                 continue;
655
656                         ret = unregister_vlan_dev(dev,
657                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
658
659                         unregister_netdevice(vlandev);
660
661                         /* Group was destroyed? */
662                         if (ret == 1)
663                                 break;
664                 }
665                 break;
666         };
667
668 out:
669         return NOTIFY_DONE;
670 }
671
672 /*
673  *      VLAN IOCTL handler.
674  *      o execute requested action or pass command to the device driver
675  *   arg is really a struct vlan_ioctl_args __user *.
676  */
677 static int vlan_ioctl_handler(void __user *arg)
678 {
679         int err = 0;
680         unsigned short vid = 0;
681         struct vlan_ioctl_args args;
682
683         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
684                 return -EFAULT;
685
686         /* Null terminate this sucker, just in case. */
687         args.device1[23] = 0;
688         args.u.device2[23] = 0;
689
690 #ifdef VLAN_DEBUG
691         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
692 #endif
693
694         switch (args.cmd) {
695         case SET_VLAN_INGRESS_PRIORITY_CMD:
696                 if (!capable(CAP_NET_ADMIN))
697                         return -EPERM;
698                 err = vlan_dev_set_ingress_priority(args.device1,
699                                                     args.u.skb_priority,
700                                                     args.vlan_qos);
701                 break;
702
703         case SET_VLAN_EGRESS_PRIORITY_CMD:
704                 if (!capable(CAP_NET_ADMIN))
705                         return -EPERM;
706                 err = vlan_dev_set_egress_priority(args.device1,
707                                                    args.u.skb_priority,
708                                                    args.vlan_qos);
709                 break;
710
711         case SET_VLAN_FLAG_CMD:
712                 if (!capable(CAP_NET_ADMIN))
713                         return -EPERM;
714                 err = vlan_dev_set_vlan_flag(args.device1,
715                                              args.u.flag,
716                                              args.vlan_qos);
717                 break;
718
719         case SET_VLAN_NAME_TYPE_CMD:
720                 if (!capable(CAP_NET_ADMIN))
721                         return -EPERM;
722                 if ((args.u.name_type >= 0) &&
723                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
724                         vlan_name_type = args.u.name_type;
725                         err = 0;
726                 } else {
727                         err = -EINVAL;
728                 }
729                 break;
730
731         case ADD_VLAN_CMD:
732                 if (!capable(CAP_NET_ADMIN))
733                         return -EPERM;
734                 /* we have been given the name of the Ethernet Device we want to
735                  * talk to:  args.dev1   We also have the
736                  * VLAN ID:  args.u.VID
737                  */
738                 if (register_vlan_device(args.device1, args.u.VID)) {
739                         err = 0;
740                 } else {
741                         err = -EINVAL;
742                 }
743                 break;
744
745         case DEL_VLAN_CMD:
746                 if (!capable(CAP_NET_ADMIN))
747                         return -EPERM;
748                 /* Here, the args.dev1 is the actual VLAN we want
749                  * to get rid of.
750                  */
751                 err = unregister_vlan_device(args.device1);
752                 break;
753
754         case GET_VLAN_INGRESS_PRIORITY_CMD:
755                 /* TODO:  Implement
756                    err = vlan_dev_get_ingress_priority(args);
757                    if (copy_to_user((void*)arg, &args,
758                         sizeof(struct vlan_ioctl_args))) {
759                         err = -EFAULT;
760                    }
761                 */
762                 err = -EINVAL;
763                 break;
764         case GET_VLAN_EGRESS_PRIORITY_CMD:
765                 /* TODO:  Implement
766                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
767                    if (copy_to_user((void*)arg, &args,
768                         sizeof(struct vlan_ioctl_args))) {
769                         err = -EFAULT;
770                    }
771                 */
772                 err = -EINVAL;
773                 break;
774         case GET_VLAN_REALDEV_NAME_CMD:
775                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
776                 if (err)
777                         goto out;
778                 if (copy_to_user(arg, &args,
779                                  sizeof(struct vlan_ioctl_args))) {
780                         err = -EFAULT;
781                 }
782                 break;
783
784         case GET_VLAN_VID_CMD:
785                 err = vlan_dev_get_vid(args.device1, &vid);
786                 if (err)
787                         goto out;
788                 args.u.VID = vid;
789                 if (copy_to_user(arg, &args,
790                                  sizeof(struct vlan_ioctl_args))) {
791                       err = -EFAULT;
792                 }
793                 break;
794
795         default:
796                 /* pass on to underlying device instead?? */
797                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
798                         __FUNCTION__, args.cmd);
799                 return -EINVAL;
800         };
801 out:
802         return err;
803 }
804
805 MODULE_LICENSE("GPL");
806 MODULE_VERSION(DRV_VERSION);