[PATCH] kzalloc() conversion in arch/ppc
[linux-3.10.git] / 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);