Merge git://git.infradead.org/mtd-2.6
[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_each_netdev_safe(dev, nxt) {
121                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
122                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
123                                             VLAN_DEV_INFO(dev)->vlan_id);
124
125                         unregister_netdevice(dev);
126                 }
127         }
128         rtnl_unlock();
129 }
130
131 /*
132  *     Module 'remove' entry point.
133  *     o delete /proc/net/router directory and static entries.
134  */
135 static void __exit vlan_cleanup_module(void)
136 {
137         int i;
138
139         vlan_ioctl_set(NULL);
140
141         /* Un-register us from receiving netdevice events */
142         unregister_netdevice_notifier(&vlan_notifier_block);
143
144         dev_remove_pack(&vlan_packet_type);
145         vlan_cleanup_devices();
146
147         /* This table must be empty if there are no module
148          * references left.
149          */
150         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
151                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
152         }
153         vlan_proc_cleanup();
154
155         synchronize_net();
156 }
157
158 module_init(vlan_proto_init);
159 module_exit(vlan_cleanup_module);
160
161 /* Must be invoked with RCU read lock (no preempt) */
162 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
163 {
164         struct vlan_group *grp;
165         struct hlist_node *n;
166         int hash = vlan_grp_hashfn(real_dev_ifindex);
167
168         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
169                 if (grp->real_dev_ifindex == real_dev_ifindex)
170                         return grp;
171         }
172
173         return NULL;
174 }
175
176 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
177  *
178  * Must be invoked with RCU read lock (no preempt)
179  */
180 struct net_device *__find_vlan_dev(struct net_device *real_dev,
181                                    unsigned short VID)
182 {
183         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
184
185         if (grp)
186                 return vlan_group_get_device(grp, VID);
187
188         return NULL;
189 }
190
191 static void vlan_group_free(struct vlan_group *grp)
192 {
193         int i;
194
195         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
196                 kfree(grp->vlan_devices_arrays[i]);
197         kfree(grp);
198 }
199
200 static void vlan_rcu_free(struct rcu_head *rcu)
201 {
202         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
203 }
204
205
206 /* This returns 0 if everything went fine.
207  * It will return 1 if the group was killed as a result.
208  * A negative return indicates failure.
209  *
210  * The RTNL lock must be held.
211  */
212 static int unregister_vlan_dev(struct net_device *real_dev,
213                                unsigned short vlan_id)
214 {
215         struct net_device *dev = NULL;
216         int real_dev_ifindex = real_dev->ifindex;
217         struct vlan_group *grp;
218         int i, ret;
219
220 #ifdef VLAN_DEBUG
221         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
222 #endif
223
224         /* sanity check */
225         if (vlan_id >= VLAN_VID_MASK)
226                 return -EINVAL;
227
228         ASSERT_RTNL();
229         grp = __vlan_find_group(real_dev_ifindex);
230
231         ret = 0;
232
233         if (grp) {
234                 dev = vlan_group_get_device(grp, vlan_id);
235                 if (dev) {
236                         /* Remove proc entry */
237                         vlan_proc_rem_dev(dev);
238
239                         /* Take it out of our own structures, but be sure to
240                          * interlock with HW accelerating devices or SW vlan
241                          * input packet processing.
242                          */
243                         if (real_dev->features &
244                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
245                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
246                         }
247
248                         vlan_group_set_device(grp, vlan_id, NULL);
249                         synchronize_net();
250
251
252                         /* Caller unregisters (and if necessary, puts)
253                          * VLAN device, but we get rid of the reference to
254                          * real_dev here.
255                          */
256                         dev_put(real_dev);
257
258                         /* If the group is now empty, kill off the
259                          * group.
260                          */
261                         for (i = 0; i < VLAN_VID_MASK; i++)
262                                 if (vlan_group_get_device(grp, i))
263                                         break;
264
265                         if (i == VLAN_VID_MASK) {
266                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
267                                         real_dev->vlan_rx_register(real_dev, NULL);
268
269                                 hlist_del_rcu(&grp->hlist);
270
271                                 /* Free the group, after all cpu's are done. */
272                                 call_rcu(&grp->rcu, vlan_rcu_free);
273
274                                 grp = NULL;
275                                 ret = 1;
276                         }
277                 }
278         }
279
280         return ret;
281 }
282
283 static int unregister_vlan_device(const char *vlan_IF_name)
284 {
285         struct net_device *dev = NULL;
286         int ret;
287
288
289         dev = dev_get_by_name(vlan_IF_name);
290         ret = -EINVAL;
291         if (dev) {
292                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
293                         rtnl_lock();
294
295                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
296                                                   VLAN_DEV_INFO(dev)->vlan_id);
297
298                         dev_put(dev);
299                         unregister_netdevice(dev);
300
301                         rtnl_unlock();
302
303                         if (ret == 1)
304                                 ret = 0;
305                 } else {
306                         printk(VLAN_ERR
307                                "%s: ERROR:      Tried to remove a non-vlan device "
308                                "with VLAN code, name: %s  priv_flags: %hX\n",
309                                __FUNCTION__, dev->name, dev->priv_flags);
310                         dev_put(dev);
311                         ret = -EPERM;
312                 }
313         } else {
314 #ifdef VLAN_DEBUG
315                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
316 #endif
317                 ret = -EINVAL;
318         }
319
320         return ret;
321 }
322
323 static void vlan_setup(struct net_device *new_dev)
324 {
325         SET_MODULE_OWNER(new_dev);
326
327         /* new_dev->ifindex = 0;  it will be set when added to
328          * the global list.
329          * iflink is set as well.
330          */
331         new_dev->get_stats = vlan_dev_get_stats;
332
333         /* Make this thing known as a VLAN device */
334         new_dev->priv_flags |= IFF_802_1Q_VLAN;
335
336         /* Set us up to have no queue, as the underlying Hardware device
337          * can do all the queueing we could want.
338          */
339         new_dev->tx_queue_len = 0;
340
341         /* set up method calls */
342         new_dev->change_mtu = vlan_dev_change_mtu;
343         new_dev->open = vlan_dev_open;
344         new_dev->stop = vlan_dev_stop;
345         new_dev->set_mac_address = vlan_dev_set_mac_address;
346         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
347         new_dev->destructor = free_netdev;
348         new_dev->do_ioctl = vlan_dev_ioctl;
349 }
350
351 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
352 {
353         /* Have to respect userspace enforced dormant state
354          * of real device, also must allow supplicant running
355          * on VLAN device
356          */
357         if (dev->operstate == IF_OPER_DORMANT)
358                 netif_dormant_on(vlandev);
359         else
360                 netif_dormant_off(vlandev);
361
362         if (netif_carrier_ok(dev)) {
363                 if (!netif_carrier_ok(vlandev))
364                         netif_carrier_on(vlandev);
365         } else {
366                 if (netif_carrier_ok(vlandev))
367                         netif_carrier_off(vlandev);
368         }
369 }
370
371 /*
372  * vlan network devices have devices nesting below it, and are a special
373  * "super class" of normal network devices; split their locks off into a
374  * separate class since they always nest.
375  */
376 static struct lock_class_key vlan_netdev_xmit_lock_key;
377
378
379 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
380  *  Returns the device that was created, or NULL if there was
381  *  an error of some kind.
382  */
383 static struct net_device *register_vlan_device(const char *eth_IF_name,
384                                                unsigned short VLAN_ID)
385 {
386         struct vlan_group *grp;
387         struct net_device *new_dev;
388         struct net_device *real_dev; /* the ethernet device */
389         char name[IFNAMSIZ];
390         int i;
391
392 #ifdef VLAN_DEBUG
393         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
394                 __FUNCTION__, eth_IF_name, VLAN_ID);
395 #endif
396
397         if (VLAN_ID >= VLAN_VID_MASK)
398                 goto out_ret_null;
399
400         /* find the device relating to eth_IF_name. */
401         real_dev = dev_get_by_name(eth_IF_name);
402         if (!real_dev)
403                 goto out_ret_null;
404
405         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
406                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
407                         __FUNCTION__, real_dev->name);
408                 goto out_put_dev;
409         }
410
411         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
412             (real_dev->vlan_rx_register == NULL ||
413              real_dev->vlan_rx_kill_vid == NULL)) {
414                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
415                         __FUNCTION__, real_dev->name);
416                 goto out_put_dev;
417         }
418
419         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
420             (real_dev->vlan_rx_add_vid == NULL ||
421              real_dev->vlan_rx_kill_vid == NULL)) {
422                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
423                         __FUNCTION__, real_dev->name);
424                 goto out_put_dev;
425         }
426
427         /* From this point on, all the data structures must remain
428          * consistent.
429          */
430         rtnl_lock();
431
432         /* The real device must be up and operating in order to
433          * assosciate a VLAN device with it.
434          */
435         if (!(real_dev->flags & IFF_UP))
436                 goto out_unlock;
437
438         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
439                 /* was already registered. */
440                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
441                 goto out_unlock;
442         }
443
444         /* Gotta set up the fields for the device. */
445 #ifdef VLAN_DEBUG
446         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
447                vlan_name_type);
448 #endif
449         switch (vlan_name_type) {
450         case VLAN_NAME_TYPE_RAW_PLUS_VID:
451                 /* name will look like:  eth1.0005 */
452                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
453                 break;
454         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
455                 /* Put our vlan.VID in the name.
456                  * Name will look like:  vlan5
457                  */
458                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
459                 break;
460         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
461                 /* Put our vlan.VID in the name.
462                  * Name will look like:  eth0.5
463                  */
464                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
465                 break;
466         case VLAN_NAME_TYPE_PLUS_VID:
467                 /* Put our vlan.VID in the name.
468                  * Name will look like:  vlan0005
469                  */
470         default:
471                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
472         }
473
474         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
475                                vlan_setup);
476
477         if (new_dev == NULL)
478                 goto out_unlock;
479
480 #ifdef VLAN_DEBUG
481         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
482 #endif
483         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
484         new_dev->flags = real_dev->flags;
485         new_dev->flags &= ~IFF_UP;
486
487         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
488                                              (1<<__LINK_STATE_DORMANT))) |
489                          (1<<__LINK_STATE_PRESENT);
490
491         /* need 4 bytes for extra VLAN header info,
492          * hope the underlying device can handle it.
493          */
494         new_dev->mtu = real_dev->mtu;
495
496         /* TODO: maybe just assign it to be ETHERNET? */
497         new_dev->type = real_dev->type;
498
499         new_dev->hard_header_len = real_dev->hard_header_len;
500         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
501                 /* Regular ethernet + 4 bytes (18 total). */
502                 new_dev->hard_header_len += VLAN_HLEN;
503         }
504
505         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
506                      new_dev->priv,
507                      sizeof(struct vlan_dev_info));
508
509         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
510         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
511         new_dev->addr_len = real_dev->addr_len;
512
513         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
514                 new_dev->hard_header = real_dev->hard_header;
515                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
516                 new_dev->rebuild_header = real_dev->rebuild_header;
517         } else {
518                 new_dev->hard_header = vlan_dev_hard_header;
519                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
520                 new_dev->rebuild_header = vlan_dev_rebuild_header;
521         }
522         new_dev->hard_header_parse = real_dev->hard_header_parse;
523
524         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
525         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
526         VLAN_DEV_INFO(new_dev)->dent = NULL;
527         VLAN_DEV_INFO(new_dev)->flags = 1;
528
529 #ifdef VLAN_DEBUG
530         printk(VLAN_DBG "About to go find the group for idx: %i\n",
531                real_dev->ifindex);
532 #endif
533
534         if (register_netdevice(new_dev))
535                 goto out_free_newdev;
536
537         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
538
539         new_dev->iflink = real_dev->ifindex;
540         vlan_transfer_operstate(real_dev, new_dev);
541         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
542
543         /* So, got the sucker initialized, now lets place
544          * it into our local structure.
545          */
546         grp = __vlan_find_group(real_dev->ifindex);
547
548         /* Note, we are running under the RTNL semaphore
549          * so it cannot "appear" on us.
550          */
551         if (!grp) { /* need to add a new group */
552                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
553                 if (!grp)
554                         goto out_free_unregister;
555
556                 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
557                         grp->vlan_devices_arrays[i] = kzalloc(
558                                 sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
559                                 GFP_KERNEL);
560
561                         if (!grp->vlan_devices_arrays[i])
562                                 goto out_free_arrays;
563                 }
564
565                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
566                 grp->real_dev_ifindex = real_dev->ifindex;
567
568                 hlist_add_head_rcu(&grp->hlist,
569                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
570
571                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
572                         real_dev->vlan_rx_register(real_dev, grp);
573         }
574
575         vlan_group_set_device(grp, VLAN_ID, new_dev);
576
577         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
578                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
579                                                          new_dev->name);
580
581         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
582                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
583
584         rtnl_unlock();
585
586
587 #ifdef VLAN_DEBUG
588         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
589 #endif
590         return new_dev;
591
592 out_free_arrays:
593         vlan_group_free(grp);
594
595 out_free_unregister:
596         unregister_netdev(new_dev);
597         goto out_unlock;
598
599 out_free_newdev:
600         free_netdev(new_dev);
601
602 out_unlock:
603         rtnl_unlock();
604
605 out_put_dev:
606         dev_put(real_dev);
607
608 out_ret_null:
609         return NULL;
610 }
611
612 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
613 {
614         struct net_device *dev = ptr;
615         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
616         int i, flgs;
617         struct net_device *vlandev;
618
619         if (!grp)
620                 goto out;
621
622         /* It is OK that we do not hold the group lock right now,
623          * as we run under the RTNL lock.
624          */
625
626         switch (event) {
627         case NETDEV_CHANGE:
628                 /* Propagate real device state to vlan devices */
629                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
630                         vlandev = vlan_group_get_device(grp, i);
631                         if (!vlandev)
632                                 continue;
633
634                         vlan_transfer_operstate(dev, vlandev);
635                 }
636                 break;
637
638         case NETDEV_DOWN:
639                 /* Put all VLANs for this dev in the down state too.  */
640                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
641                         vlandev = vlan_group_get_device(grp, i);
642                         if (!vlandev)
643                                 continue;
644
645                         flgs = vlandev->flags;
646                         if (!(flgs & IFF_UP))
647                                 continue;
648
649                         dev_change_flags(vlandev, flgs & ~IFF_UP);
650                 }
651                 break;
652
653         case NETDEV_UP:
654                 /* Put all VLANs for this dev in the up state too.  */
655                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
656                         vlandev = vlan_group_get_device(grp, i);
657                         if (!vlandev)
658                                 continue;
659
660                         flgs = vlandev->flags;
661                         if (flgs & IFF_UP)
662                                 continue;
663
664                         dev_change_flags(vlandev, flgs | IFF_UP);
665                 }
666                 break;
667
668         case NETDEV_UNREGISTER:
669                 /* Delete all VLANs for this dev. */
670                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
671                         int ret;
672
673                         vlandev = vlan_group_get_device(grp, i);
674                         if (!vlandev)
675                                 continue;
676
677                         ret = unregister_vlan_dev(dev,
678                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
679
680                         unregister_netdevice(vlandev);
681
682                         /* Group was destroyed? */
683                         if (ret == 1)
684                                 break;
685                 }
686                 break;
687         }
688
689 out:
690         return NOTIFY_DONE;
691 }
692
693 /*
694  *      VLAN IOCTL handler.
695  *      o execute requested action or pass command to the device driver
696  *   arg is really a struct vlan_ioctl_args __user *.
697  */
698 static int vlan_ioctl_handler(void __user *arg)
699 {
700         int err = 0;
701         unsigned short vid = 0;
702         struct vlan_ioctl_args args;
703
704         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
705                 return -EFAULT;
706
707         /* Null terminate this sucker, just in case. */
708         args.device1[23] = 0;
709         args.u.device2[23] = 0;
710
711 #ifdef VLAN_DEBUG
712         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
713 #endif
714
715         switch (args.cmd) {
716         case SET_VLAN_INGRESS_PRIORITY_CMD:
717                 if (!capable(CAP_NET_ADMIN))
718                         return -EPERM;
719                 err = vlan_dev_set_ingress_priority(args.device1,
720                                                     args.u.skb_priority,
721                                                     args.vlan_qos);
722                 break;
723
724         case SET_VLAN_EGRESS_PRIORITY_CMD:
725                 if (!capable(CAP_NET_ADMIN))
726                         return -EPERM;
727                 err = vlan_dev_set_egress_priority(args.device1,
728                                                    args.u.skb_priority,
729                                                    args.vlan_qos);
730                 break;
731
732         case SET_VLAN_FLAG_CMD:
733                 if (!capable(CAP_NET_ADMIN))
734                         return -EPERM;
735                 err = vlan_dev_set_vlan_flag(args.device1,
736                                              args.u.flag,
737                                              args.vlan_qos);
738                 break;
739
740         case SET_VLAN_NAME_TYPE_CMD:
741                 if (!capable(CAP_NET_ADMIN))
742                         return -EPERM;
743                 if ((args.u.name_type >= 0) &&
744                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
745                         vlan_name_type = args.u.name_type;
746                         err = 0;
747                 } else {
748                         err = -EINVAL;
749                 }
750                 break;
751
752         case ADD_VLAN_CMD:
753                 if (!capable(CAP_NET_ADMIN))
754                         return -EPERM;
755                 /* we have been given the name of the Ethernet Device we want to
756                  * talk to:  args.dev1   We also have the
757                  * VLAN ID:  args.u.VID
758                  */
759                 if (register_vlan_device(args.device1, args.u.VID)) {
760                         err = 0;
761                 } else {
762                         err = -EINVAL;
763                 }
764                 break;
765
766         case DEL_VLAN_CMD:
767                 if (!capable(CAP_NET_ADMIN))
768                         return -EPERM;
769                 /* Here, the args.dev1 is the actual VLAN we want
770                  * to get rid of.
771                  */
772                 err = unregister_vlan_device(args.device1);
773                 break;
774
775         case GET_VLAN_INGRESS_PRIORITY_CMD:
776                 /* TODO:  Implement
777                    err = vlan_dev_get_ingress_priority(args);
778                    if (copy_to_user((void*)arg, &args,
779                         sizeof(struct vlan_ioctl_args))) {
780                         err = -EFAULT;
781                    }
782                 */
783                 err = -EINVAL;
784                 break;
785         case GET_VLAN_EGRESS_PRIORITY_CMD:
786                 /* TODO:  Implement
787                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
788                    if (copy_to_user((void*)arg, &args,
789                         sizeof(struct vlan_ioctl_args))) {
790                         err = -EFAULT;
791                    }
792                 */
793                 err = -EINVAL;
794                 break;
795         case GET_VLAN_REALDEV_NAME_CMD:
796                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
797                 if (err)
798                         goto out;
799                 if (copy_to_user(arg, &args,
800                                  sizeof(struct vlan_ioctl_args))) {
801                         err = -EFAULT;
802                 }
803                 break;
804
805         case GET_VLAN_VID_CMD:
806                 err = vlan_dev_get_vid(args.device1, &vid);
807                 if (err)
808                         goto out;
809                 args.u.VID = vid;
810                 if (copy_to_user(arg, &args,
811                                  sizeof(struct vlan_ioctl_args))) {
812                       err = -EFAULT;
813                 }
814                 break;
815
816         default:
817                 /* pass on to underlying device instead?? */
818                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
819                         __FUNCTION__, args.cmd);
820                 return -EINVAL;
821         }
822 out:
823         return err;
824 }
825
826 MODULE_LICENSE("GPL");
827 MODULE_VERSION(DRV_VERSION);