c0c7bb8e9f071783205e3426eef113b3679b1d3c
[linux-2.6.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 /* 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 vlan_group_get_device(grp, VID);
188
189         return NULL;
190 }
191
192 static void vlan_group_free(struct vlan_group *grp)
193 {
194         int i;
195
196         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
197                 kfree(grp->vlan_devices_arrays[i]);
198         kfree(grp);
199 }
200
201 static void vlan_rcu_free(struct rcu_head *rcu)
202 {
203         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
204 }
205
206
207 /* This returns 0 if everything went fine.
208  * It will return 1 if the group was killed as a result.
209  * A negative return indicates failure.
210  *
211  * The RTNL lock must be held.
212  */
213 static int unregister_vlan_dev(struct net_device *real_dev,
214                                unsigned short vlan_id)
215 {
216         struct net_device *dev = NULL;
217         int real_dev_ifindex = real_dev->ifindex;
218         struct vlan_group *grp;
219         int i, ret;
220
221 #ifdef VLAN_DEBUG
222         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
223 #endif
224
225         /* sanity check */
226         if (vlan_id >= VLAN_VID_MASK)
227                 return -EINVAL;
228
229         ASSERT_RTNL();
230         grp = __vlan_find_group(real_dev_ifindex);
231
232         ret = 0;
233
234         if (grp) {
235                 dev = vlan_group_get_device(grp, vlan_id);
236                 if (dev) {
237                         /* Remove proc entry */
238                         vlan_proc_rem_dev(dev);
239
240                         /* Take it out of our own structures, but be sure to
241                          * interlock with HW accelerating devices or SW vlan
242                          * input packet processing.
243                          */
244                         if (real_dev->features &
245                             (NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER)) {
246                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
247                         }
248
249                         vlan_group_set_device(grp, vlan_id, NULL);
250                         synchronize_net();
251
252
253                         /* Caller unregisters (and if necessary, puts)
254                          * VLAN device, but we get rid of the reference to
255                          * real_dev here.
256                          */
257                         dev_put(real_dev);
258
259                         /* If the group is now empty, kill off the
260                          * group.
261                          */
262                         for (i = 0; i < VLAN_VID_MASK; i++)
263                                 if (vlan_group_get_device(grp, i))
264                                         break;
265
266                         if (i == VLAN_VID_MASK) {
267                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
268                                         real_dev->vlan_rx_register(real_dev, NULL);
269
270                                 hlist_del_rcu(&grp->hlist);
271
272                                 /* Free the group, after all cpu's are done. */
273                                 call_rcu(&grp->rcu, vlan_rcu_free);
274
275                                 grp = NULL;
276                                 ret = 1;
277                         }
278                 }
279         }
280
281         return ret;
282 }
283
284 static int unregister_vlan_device(const char *vlan_IF_name)
285 {
286         struct net_device *dev = NULL;
287         int ret;
288
289
290         dev = dev_get_by_name(vlan_IF_name);
291         ret = -EINVAL;
292         if (dev) {
293                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
294                         rtnl_lock();
295
296                         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
297                                                   VLAN_DEV_INFO(dev)->vlan_id);
298
299                         dev_put(dev);
300                         unregister_netdevice(dev);
301
302                         rtnl_unlock();
303
304                         if (ret == 1)
305                                 ret = 0;
306                 } else {
307                         printk(VLAN_ERR
308                                "%s: ERROR:      Tried to remove a non-vlan device "
309                                "with VLAN code, name: %s  priv_flags: %hX\n",
310                                __FUNCTION__, dev->name, dev->priv_flags);
311                         dev_put(dev);
312                         ret = -EPERM;
313                 }
314         } else {
315 #ifdef VLAN_DEBUG
316                 printk(VLAN_DBG "%s: WARNING: Could not find dev.\n", __FUNCTION__);
317 #endif
318                 ret = -EINVAL;
319         }
320
321         return ret;
322 }
323
324 static void vlan_setup(struct net_device *new_dev)
325 {
326         SET_MODULE_OWNER(new_dev);
327
328         /* new_dev->ifindex = 0;  it will be set when added to
329          * the global list.
330          * iflink is set as well.
331          */
332         new_dev->get_stats = vlan_dev_get_stats;
333
334         /* Make this thing known as a VLAN device */
335         new_dev->priv_flags |= IFF_802_1Q_VLAN;
336
337         /* Set us up to have no queue, as the underlying Hardware device
338          * can do all the queueing we could want.
339          */
340         new_dev->tx_queue_len = 0;
341
342         /* set up method calls */
343         new_dev->change_mtu = vlan_dev_change_mtu;
344         new_dev->open = vlan_dev_open;
345         new_dev->stop = vlan_dev_stop;
346         new_dev->set_mac_address = vlan_dev_set_mac_address;
347         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
348         new_dev->destructor = free_netdev;
349         new_dev->do_ioctl = vlan_dev_ioctl;
350 }
351
352 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
353 {
354         /* Have to respect userspace enforced dormant state
355          * of real device, also must allow supplicant running
356          * on VLAN device
357          */
358         if (dev->operstate == IF_OPER_DORMANT)
359                 netif_dormant_on(vlandev);
360         else
361                 netif_dormant_off(vlandev);
362
363         if (netif_carrier_ok(dev)) {
364                 if (!netif_carrier_ok(vlandev))
365                         netif_carrier_on(vlandev);
366         } else {
367                 if (netif_carrier_ok(vlandev))
368                         netif_carrier_off(vlandev);
369         }
370 }
371
372 /*
373  * vlan network devices have devices nesting below it, and are a special
374  * "super class" of normal network devices; split their locks off into a
375  * separate class since they always nest.
376  */
377 static struct lock_class_key vlan_netdev_xmit_lock_key;
378
379
380 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
381  *  Returns the device that was created, or NULL if there was
382  *  an error of some kind.
383  */
384 static struct net_device *register_vlan_device(const char *eth_IF_name,
385                                                unsigned short VLAN_ID)
386 {
387         struct vlan_group *grp;
388         struct net_device *new_dev;
389         struct net_device *real_dev; /* the ethernet device */
390         char name[IFNAMSIZ];
391         int i;
392
393 #ifdef VLAN_DEBUG
394         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
395                 __FUNCTION__, eth_IF_name, VLAN_ID);
396 #endif
397
398         if (VLAN_ID >= VLAN_VID_MASK)
399                 goto out_ret_null;
400
401         /* find the device relating to eth_IF_name. */
402         real_dev = dev_get_by_name(eth_IF_name);
403         if (!real_dev)
404                 goto out_ret_null;
405
406         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
407                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
408                         __FUNCTION__, real_dev->name);
409                 goto out_put_dev;
410         }
411
412         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
413             (real_dev->vlan_rx_register == NULL ||
414              real_dev->vlan_rx_kill_vid == NULL)) {
415                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
416                         __FUNCTION__, real_dev->name);
417                 goto out_put_dev;
418         }
419
420         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
421             (real_dev->vlan_rx_add_vid == NULL ||
422              real_dev->vlan_rx_kill_vid == NULL)) {
423                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
424                         __FUNCTION__, real_dev->name);
425                 goto out_put_dev;
426         }
427
428         /* From this point on, all the data structures must remain
429          * consistent.
430          */
431         rtnl_lock();
432
433         /* The real device must be up and operating in order to
434          * assosciate a VLAN device with it.
435          */
436         if (!(real_dev->flags & IFF_UP))
437                 goto out_unlock;
438
439         if (__find_vlan_dev(real_dev, VLAN_ID) != NULL) {
440                 /* was already registered. */
441                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
442                 goto out_unlock;
443         }
444
445         /* Gotta set up the fields for the device. */
446 #ifdef VLAN_DEBUG
447         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
448                vlan_name_type);
449 #endif
450         switch (vlan_name_type) {
451         case VLAN_NAME_TYPE_RAW_PLUS_VID:
452                 /* name will look like:  eth1.0005 */
453                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
454                 break;
455         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
456                 /* Put our vlan.VID in the name.
457                  * Name will look like:  vlan5
458                  */
459                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
460                 break;
461         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
462                 /* Put our vlan.VID in the name.
463                  * Name will look like:  eth0.5
464                  */
465                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
466                 break;
467         case VLAN_NAME_TYPE_PLUS_VID:
468                 /* Put our vlan.VID in the name.
469                  * Name will look like:  vlan0005
470                  */
471         default:
472                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
473         }
474
475         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
476                                vlan_setup);
477
478         if (new_dev == NULL)
479                 goto out_unlock;
480
481 #ifdef VLAN_DEBUG
482         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
483 #endif
484         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
485         new_dev->flags = real_dev->flags;
486         new_dev->flags &= ~IFF_UP;
487
488         new_dev->state = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
489                                              (1<<__LINK_STATE_DORMANT))) |
490                          (1<<__LINK_STATE_PRESENT);
491
492         /* need 4 bytes for extra VLAN header info,
493          * hope the underlying device can handle it.
494          */
495         new_dev->mtu = real_dev->mtu;
496
497         /* TODO: maybe just assign it to be ETHERNET? */
498         new_dev->type = real_dev->type;
499
500         new_dev->hard_header_len = real_dev->hard_header_len;
501         if (!(real_dev->features & NETIF_F_HW_VLAN_TX)) {
502                 /* Regular ethernet + 4 bytes (18 total). */
503                 new_dev->hard_header_len += VLAN_HLEN;
504         }
505
506         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
507                      new_dev->priv,
508                      sizeof(struct vlan_dev_info));
509
510         memcpy(new_dev->broadcast, real_dev->broadcast, real_dev->addr_len);
511         memcpy(new_dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
512         new_dev->addr_len = real_dev->addr_len;
513
514         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
515                 new_dev->hard_header = real_dev->hard_header;
516                 new_dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
517                 new_dev->rebuild_header = real_dev->rebuild_header;
518         } else {
519                 new_dev->hard_header = vlan_dev_hard_header;
520                 new_dev->hard_start_xmit = vlan_dev_hard_start_xmit;
521                 new_dev->rebuild_header = vlan_dev_rebuild_header;
522         }
523         new_dev->hard_header_parse = real_dev->hard_header_parse;
524
525         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
526         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
527         VLAN_DEV_INFO(new_dev)->dent = NULL;
528         VLAN_DEV_INFO(new_dev)->flags = 1;
529
530 #ifdef VLAN_DEBUG
531         printk(VLAN_DBG "About to go find the group for idx: %i\n",
532                real_dev->ifindex);
533 #endif
534
535         if (register_netdevice(new_dev))
536                 goto out_free_newdev;
537
538         lockdep_set_class(&new_dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
539
540         new_dev->iflink = real_dev->ifindex;
541         vlan_transfer_operstate(real_dev, new_dev);
542         linkwatch_fire_event(new_dev); /* _MUST_ call rfc2863_policy() */
543
544         /* So, got the sucker initialized, now lets place
545          * it into our local structure.
546          */
547         grp = __vlan_find_group(real_dev->ifindex);
548
549         /* Note, we are running under the RTNL semaphore
550          * so it cannot "appear" on us.
551          */
552         if (!grp) { /* need to add a new group */
553                 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
554                 if (!grp)
555                         goto out_free_unregister;
556
557                 for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
558                         grp->vlan_devices_arrays[i] = kzalloc(
559                                 sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
560                                 GFP_KERNEL);
561
562                         if (!grp->vlan_devices_arrays[i])
563                                 goto out_free_arrays;
564                 }
565
566                 /* printk(KERN_ALERT "VLAN REGISTER:  Allocated new group.\n"); */
567                 grp->real_dev_ifindex = real_dev->ifindex;
568
569                 hlist_add_head_rcu(&grp->hlist,
570                                    &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
571
572                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
573                         real_dev->vlan_rx_register(real_dev, grp);
574         }
575
576         vlan_group_set_device(grp, VLAN_ID, new_dev);
577
578         if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
579                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
580                                                          new_dev->name);
581
582         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
583                 real_dev->vlan_rx_add_vid(real_dev, VLAN_ID);
584
585         rtnl_unlock();
586
587
588 #ifdef VLAN_DEBUG
589         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
590 #endif
591         return new_dev;
592
593 out_free_arrays:
594         vlan_group_free(grp);
595
596 out_free_unregister:
597         unregister_netdev(new_dev);
598         goto out_unlock;
599
600 out_free_newdev:
601         free_netdev(new_dev);
602
603 out_unlock:
604         rtnl_unlock();
605
606 out_put_dev:
607         dev_put(real_dev);
608
609 out_ret_null:
610         return NULL;
611 }
612
613 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
614 {
615         struct net_device *dev = ptr;
616         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
617         int i, flgs;
618         struct net_device *vlandev;
619
620         if (!grp)
621                 goto out;
622
623         /* It is OK that we do not hold the group lock right now,
624          * as we run under the RTNL lock.
625          */
626
627         switch (event) {
628         case NETDEV_CHANGE:
629                 /* Propagate real device state to vlan devices */
630                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
631                         vlandev = vlan_group_get_device(grp, i);
632                         if (!vlandev)
633                                 continue;
634
635                         vlan_transfer_operstate(dev, vlandev);
636                 }
637                 break;
638
639         case NETDEV_DOWN:
640                 /* Put all VLANs for this dev in the down state too.  */
641                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
642                         vlandev = vlan_group_get_device(grp, i);
643                         if (!vlandev)
644                                 continue;
645
646                         flgs = vlandev->flags;
647                         if (!(flgs & IFF_UP))
648                                 continue;
649
650                         dev_change_flags(vlandev, flgs & ~IFF_UP);
651                 }
652                 break;
653
654         case NETDEV_UP:
655                 /* Put all VLANs for this dev in the up state too.  */
656                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
657                         vlandev = vlan_group_get_device(grp, i);
658                         if (!vlandev)
659                                 continue;
660
661                         flgs = vlandev->flags;
662                         if (flgs & IFF_UP)
663                                 continue;
664
665                         dev_change_flags(vlandev, flgs | IFF_UP);
666                 }
667                 break;
668
669         case NETDEV_UNREGISTER:
670                 /* Delete all VLANs for this dev. */
671                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
672                         int ret;
673
674                         vlandev = vlan_group_get_device(grp, i);
675                         if (!vlandev)
676                                 continue;
677
678                         ret = unregister_vlan_dev(dev,
679                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
680
681                         unregister_netdevice(vlandev);
682
683                         /* Group was destroyed? */
684                         if (ret == 1)
685                                 break;
686                 }
687                 break;
688         }
689
690 out:
691         return NOTIFY_DONE;
692 }
693
694 /*
695  *      VLAN IOCTL handler.
696  *      o execute requested action or pass command to the device driver
697  *   arg is really a struct vlan_ioctl_args __user *.
698  */
699 static int vlan_ioctl_handler(void __user *arg)
700 {
701         int err = 0;
702         unsigned short vid = 0;
703         struct vlan_ioctl_args args;
704
705         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
706                 return -EFAULT;
707
708         /* Null terminate this sucker, just in case. */
709         args.device1[23] = 0;
710         args.u.device2[23] = 0;
711
712 #ifdef VLAN_DEBUG
713         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
714 #endif
715
716         switch (args.cmd) {
717         case SET_VLAN_INGRESS_PRIORITY_CMD:
718                 if (!capable(CAP_NET_ADMIN))
719                         return -EPERM;
720                 err = vlan_dev_set_ingress_priority(args.device1,
721                                                     args.u.skb_priority,
722                                                     args.vlan_qos);
723                 break;
724
725         case SET_VLAN_EGRESS_PRIORITY_CMD:
726                 if (!capable(CAP_NET_ADMIN))
727                         return -EPERM;
728                 err = vlan_dev_set_egress_priority(args.device1,
729                                                    args.u.skb_priority,
730                                                    args.vlan_qos);
731                 break;
732
733         case SET_VLAN_FLAG_CMD:
734                 if (!capable(CAP_NET_ADMIN))
735                         return -EPERM;
736                 err = vlan_dev_set_vlan_flag(args.device1,
737                                              args.u.flag,
738                                              args.vlan_qos);
739                 break;
740
741         case SET_VLAN_NAME_TYPE_CMD:
742                 if (!capable(CAP_NET_ADMIN))
743                         return -EPERM;
744                 if ((args.u.name_type >= 0) &&
745                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
746                         vlan_name_type = args.u.name_type;
747                         err = 0;
748                 } else {
749                         err = -EINVAL;
750                 }
751                 break;
752
753         case ADD_VLAN_CMD:
754                 if (!capable(CAP_NET_ADMIN))
755                         return -EPERM;
756                 /* we have been given the name of the Ethernet Device we want to
757                  * talk to:  args.dev1   We also have the
758                  * VLAN ID:  args.u.VID
759                  */
760                 if (register_vlan_device(args.device1, args.u.VID)) {
761                         err = 0;
762                 } else {
763                         err = -EINVAL;
764                 }
765                 break;
766
767         case DEL_VLAN_CMD:
768                 if (!capable(CAP_NET_ADMIN))
769                         return -EPERM;
770                 /* Here, the args.dev1 is the actual VLAN we want
771                  * to get rid of.
772                  */
773                 err = unregister_vlan_device(args.device1);
774                 break;
775
776         case GET_VLAN_INGRESS_PRIORITY_CMD:
777                 /* TODO:  Implement
778                    err = vlan_dev_get_ingress_priority(args);
779                    if (copy_to_user((void*)arg, &args,
780                         sizeof(struct vlan_ioctl_args))) {
781                         err = -EFAULT;
782                    }
783                 */
784                 err = -EINVAL;
785                 break;
786         case GET_VLAN_EGRESS_PRIORITY_CMD:
787                 /* TODO:  Implement
788                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
789                    if (copy_to_user((void*)arg, &args,
790                         sizeof(struct vlan_ioctl_args))) {
791                         err = -EFAULT;
792                    }
793                 */
794                 err = -EINVAL;
795                 break;
796         case GET_VLAN_REALDEV_NAME_CMD:
797                 err = vlan_dev_get_realdev_name(args.device1, args.u.device2);
798                 if (err)
799                         goto out;
800                 if (copy_to_user(arg, &args,
801                                  sizeof(struct vlan_ioctl_args))) {
802                         err = -EFAULT;
803                 }
804                 break;
805
806         case GET_VLAN_VID_CMD:
807                 err = vlan_dev_get_vid(args.device1, &vid);
808                 if (err)
809                         goto out;
810                 args.u.VID = vid;
811                 if (copy_to_user(arg, &args,
812                                  sizeof(struct vlan_ioctl_args))) {
813                       err = -EFAULT;
814                 }
815                 break;
816
817         default:
818                 /* pass on to underlying device instead?? */
819                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
820                         __FUNCTION__, args.cmd);
821                 return -EINVAL;
822         }
823 out:
824         return err;
825 }
826
827 MODULE_LICENSE("GPL");
828 MODULE_VERSION(DRV_VERSION);