[8021Q]: transfer dev_id from real device
[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 #include <net/net_namespace.h>
35
36 #include <linux/if_vlan.h>
37 #include "vlan.h"
38 #include "vlanproc.h"
39
40 #define DRV_VERSION "1.8"
41
42 /* Global VLAN variables */
43
44 /* Our listing of VLAN group(s) */
45 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
46 #define vlan_grp_hashfn(IDX)    ((((IDX) >> VLAN_GRP_HASH_SHIFT) ^ (IDX)) & VLAN_GRP_HASH_MASK)
47
48 static char vlan_fullname[] = "802.1Q VLAN Support";
49 static char vlan_version[] = DRV_VERSION;
50 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
51 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
52
53 static int vlan_device_event(struct notifier_block *, unsigned long, void *);
54 static int vlan_ioctl_handler(struct net *net, void __user *);
55 static int unregister_vlan_dev(struct net_device *, unsigned short );
56
57 static struct notifier_block vlan_notifier_block = {
58         .notifier_call = vlan_device_event,
59 };
60
61 /* These may be changed at run-time through IOCTLs */
62
63 /* Determines interface naming scheme. */
64 unsigned short vlan_name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
65
66 static struct packet_type vlan_packet_type = {
67         .type = __constant_htons(ETH_P_8021Q),
68         .func = vlan_skb_recv, /* VLAN receive method */
69 };
70
71 /* End of global variables definitions. */
72
73 /*
74  * Function vlan_proto_init (pro)
75  *
76  *    Initialize VLAN protocol layer,
77  *
78  */
79 static int __init vlan_proto_init(void)
80 {
81         int err;
82
83         printk(VLAN_INF "%s v%s %s\n",
84                vlan_fullname, vlan_version, vlan_copyright);
85         printk(VLAN_INF "All bugs added by %s\n",
86                vlan_buggyright);
87
88         /* proc file system initialization */
89         err = vlan_proc_init();
90         if (err < 0) {
91                 printk(KERN_ERR
92                        "%s %s: can't create entry in proc filesystem!\n",
93                        __FUNCTION__, VLAN_NAME);
94                 return err;
95         }
96
97         dev_add_pack(&vlan_packet_type);
98
99         /* Register us to receive netdevice events */
100         err = register_netdevice_notifier(&vlan_notifier_block);
101         if (err < 0)
102                 goto err1;
103
104         err = vlan_netlink_init();
105         if (err < 0)
106                 goto err2;
107
108         vlan_ioctl_set(vlan_ioctl_handler);
109         return 0;
110
111 err2:
112         unregister_netdevice_notifier(&vlan_notifier_block);
113 err1:
114         vlan_proc_cleanup();
115         dev_remove_pack(&vlan_packet_type);
116         return err;
117 }
118
119 /*
120  *     Module 'remove' entry point.
121  *     o delete /proc/net/router directory and static entries.
122  */
123 static void __exit vlan_cleanup_module(void)
124 {
125         int i;
126
127         vlan_netlink_fini();
128         vlan_ioctl_set(NULL);
129
130         /* Un-register us from receiving netdevice events */
131         unregister_netdevice_notifier(&vlan_notifier_block);
132
133         dev_remove_pack(&vlan_packet_type);
134
135         /* This table must be empty if there are no module
136          * references left.
137          */
138         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
139                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
140         }
141         vlan_proc_cleanup();
142
143         synchronize_net();
144 }
145
146 module_init(vlan_proto_init);
147 module_exit(vlan_cleanup_module);
148
149 /* Must be invoked with RCU read lock (no preempt) */
150 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
151 {
152         struct vlan_group *grp;
153         struct hlist_node *n;
154         int hash = vlan_grp_hashfn(real_dev_ifindex);
155
156         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
157                 if (grp->real_dev_ifindex == real_dev_ifindex)
158                         return grp;
159         }
160
161         return NULL;
162 }
163
164 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
165  *
166  * Must be invoked with RCU read lock (no preempt)
167  */
168 struct net_device *__find_vlan_dev(struct net_device *real_dev,
169                                    unsigned short VID)
170 {
171         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
172
173         if (grp)
174                 return vlan_group_get_device(grp, VID);
175
176         return NULL;
177 }
178
179 static void vlan_group_free(struct vlan_group *grp)
180 {
181         int i;
182
183         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
184                 kfree(grp->vlan_devices_arrays[i]);
185         kfree(grp);
186 }
187
188 static struct vlan_group *vlan_group_alloc(int ifindex)
189 {
190         struct vlan_group *grp;
191         unsigned int size;
192         unsigned int i;
193
194         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
195         if (!grp)
196                 return NULL;
197
198         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
199
200         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
201                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
202                 if (!grp->vlan_devices_arrays[i])
203                         goto err;
204         }
205
206         grp->real_dev_ifindex = ifindex;
207         hlist_add_head_rcu(&grp->hlist,
208                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
209         return grp;
210
211 err:
212         vlan_group_free(grp);
213         return NULL;
214 }
215
216 static void vlan_rcu_free(struct rcu_head *rcu)
217 {
218         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
219 }
220
221
222 /* This returns 0 if everything went fine.
223  * It will return 1 if the group was killed as a result.
224  * A negative return indicates failure.
225  *
226  * The RTNL lock must be held.
227  */
228 static int unregister_vlan_dev(struct net_device *real_dev,
229                                unsigned short vlan_id)
230 {
231         struct net_device *dev = NULL;
232         int real_dev_ifindex = real_dev->ifindex;
233         struct vlan_group *grp;
234         int i, ret;
235
236 #ifdef VLAN_DEBUG
237         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
238 #endif
239
240         /* sanity check */
241         if (vlan_id >= VLAN_VID_MASK)
242                 return -EINVAL;
243
244         ASSERT_RTNL();
245         grp = __vlan_find_group(real_dev_ifindex);
246
247         ret = 0;
248
249         if (grp) {
250                 dev = vlan_group_get_device(grp, vlan_id);
251                 if (dev) {
252                         /* Remove proc entry */
253                         vlan_proc_rem_dev(dev);
254
255                         /* Take it out of our own structures, but be sure to
256                          * interlock with HW accelerating devices or SW vlan
257                          * input packet processing.
258                          */
259                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
260                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
261
262                         vlan_group_set_device(grp, vlan_id, NULL);
263                         synchronize_net();
264
265
266                         /* Caller unregisters (and if necessary, puts)
267                          * VLAN device, but we get rid of the reference to
268                          * real_dev here.
269                          */
270                         dev_put(real_dev);
271
272                         /* If the group is now empty, kill off the
273                          * group.
274                          */
275                         for (i = 0; i < VLAN_VID_MASK; i++)
276                                 if (vlan_group_get_device(grp, i))
277                                         break;
278
279                         if (i == VLAN_VID_MASK) {
280                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
281                                         real_dev->vlan_rx_register(real_dev, NULL);
282
283                                 hlist_del_rcu(&grp->hlist);
284
285                                 /* Free the group, after all cpu's are done. */
286                                 call_rcu(&grp->rcu, vlan_rcu_free);
287
288                                 grp = NULL;
289                                 ret = 1;
290                         }
291                 }
292         }
293
294         return ret;
295 }
296
297 int unregister_vlan_device(struct net_device *dev)
298 {
299         int ret;
300
301         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
302                                   VLAN_DEV_INFO(dev)->vlan_id);
303         unregister_netdevice(dev);
304
305         if (ret == 1)
306                 ret = 0;
307         return ret;
308 }
309
310 /*
311  * vlan network devices have devices nesting below it, and are a special
312  * "super class" of normal network devices; split their locks off into a
313  * separate class since they always nest.
314  */
315 static struct lock_class_key vlan_netdev_xmit_lock_key;
316
317 static const struct header_ops vlan_header_ops = {
318         .create  = vlan_dev_hard_header,
319         .rebuild = vlan_dev_rebuild_header,
320         .parse   = eth_header_parse,
321 };
322
323 static int vlan_dev_init(struct net_device *dev)
324 {
325         struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
326
327         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
328         dev->flags  = real_dev->flags & ~IFF_UP;
329         dev->iflink = real_dev->ifindex;
330         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
331                                           (1<<__LINK_STATE_DORMANT))) |
332                       (1<<__LINK_STATE_PRESENT);
333
334         /* ipv6 shared card related stuff */
335         dev->dev_id = real_dev->dev_id;
336
337         if (is_zero_ether_addr(dev->dev_addr))
338                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
339         if (is_zero_ether_addr(dev->broadcast))
340                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
341
342         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
343                 dev->header_ops      = real_dev->header_ops;
344                 dev->hard_header_len = real_dev->hard_header_len;
345                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
346         } else {
347                 dev->header_ops      = &vlan_header_ops;
348                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
349                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
350         }
351
352         lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
353         return 0;
354 }
355
356 void vlan_setup(struct net_device *new_dev)
357 {
358         ether_setup(new_dev);
359
360         /* new_dev->ifindex = 0;  it will be set when added to
361          * the global list.
362          * iflink is set as well.
363          */
364         new_dev->get_stats = vlan_dev_get_stats;
365
366         /* Make this thing known as a VLAN device */
367         new_dev->priv_flags |= IFF_802_1Q_VLAN;
368
369         /* Set us up to have no queue, as the underlying Hardware device
370          * can do all the queueing we could want.
371          */
372         new_dev->tx_queue_len = 0;
373
374         /* set up method calls */
375         new_dev->change_mtu = vlan_dev_change_mtu;
376         new_dev->init = vlan_dev_init;
377         new_dev->open = vlan_dev_open;
378         new_dev->stop = vlan_dev_stop;
379         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
380         new_dev->change_rx_flags = vlan_change_rx_flags;
381         new_dev->destructor = free_netdev;
382         new_dev->do_ioctl = vlan_dev_ioctl;
383
384         memset(new_dev->broadcast, 0, ETH_ALEN);
385 }
386
387 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
388 {
389         /* Have to respect userspace enforced dormant state
390          * of real device, also must allow supplicant running
391          * on VLAN device
392          */
393         if (dev->operstate == IF_OPER_DORMANT)
394                 netif_dormant_on(vlandev);
395         else
396                 netif_dormant_off(vlandev);
397
398         if (netif_carrier_ok(dev)) {
399                 if (!netif_carrier_ok(vlandev))
400                         netif_carrier_on(vlandev);
401         } else {
402                 if (netif_carrier_ok(vlandev))
403                         netif_carrier_off(vlandev);
404         }
405 }
406
407 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
408 {
409         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
410                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
411                         __FUNCTION__, real_dev->name);
412                 return -EOPNOTSUPP;
413         }
414
415         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
416             !real_dev->vlan_rx_register) {
417                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
418                         __FUNCTION__, real_dev->name);
419                 return -EOPNOTSUPP;
420         }
421
422         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
423             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
424                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
425                         __FUNCTION__, real_dev->name);
426                 return -EOPNOTSUPP;
427         }
428
429         /* The real device must be up and operating in order to
430          * assosciate a VLAN device with it.
431          */
432         if (!(real_dev->flags & IFF_UP))
433                 return -ENETDOWN;
434
435         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
436                 /* was already registered. */
437                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
438                 return -EEXIST;
439         }
440
441         return 0;
442 }
443
444 int register_vlan_dev(struct net_device *dev)
445 {
446         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
447         struct net_device *real_dev = vlan->real_dev;
448         unsigned short vlan_id = vlan->vlan_id;
449         struct vlan_group *grp, *ngrp = NULL;
450         int err;
451
452         grp = __vlan_find_group(real_dev->ifindex);
453         if (!grp) {
454                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
455                 if (!grp)
456                         return -ENOBUFS;
457         }
458
459         err = register_netdevice(dev);
460         if (err < 0)
461                 goto out_free_group;
462
463         /* Account for reference in struct vlan_dev_info */
464         dev_hold(real_dev);
465
466         vlan_transfer_operstate(real_dev, dev);
467         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
468
469         /* So, got the sucker initialized, now lets place
470          * it into our local structure.
471          */
472         vlan_group_set_device(grp, vlan_id, dev);
473         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
474                 real_dev->vlan_rx_register(real_dev, ngrp);
475         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
476                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
477
478         if (vlan_proc_add_dev(dev) < 0)
479                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
480                        dev->name);
481         return 0;
482
483 out_free_group:
484         if (ngrp)
485                 vlan_group_free(ngrp);
486         return err;
487 }
488
489 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
490  *  Returns 0 if the device was created or a negative error code otherwise.
491  */
492 static int register_vlan_device(struct net_device *real_dev,
493                                 unsigned short VLAN_ID)
494 {
495         struct net_device *new_dev;
496         char name[IFNAMSIZ];
497         int err;
498
499 #ifdef VLAN_DEBUG
500         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
501                 __FUNCTION__, eth_IF_name, VLAN_ID);
502 #endif
503
504         if (VLAN_ID >= VLAN_VID_MASK)
505                 return -ERANGE;
506
507         err = vlan_check_real_dev(real_dev, VLAN_ID);
508         if (err < 0)
509                 return err;
510
511         /* Gotta set up the fields for the device. */
512 #ifdef VLAN_DEBUG
513         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
514                vlan_name_type);
515 #endif
516         switch (vlan_name_type) {
517         case VLAN_NAME_TYPE_RAW_PLUS_VID:
518                 /* name will look like:  eth1.0005 */
519                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
520                 break;
521         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
522                 /* Put our vlan.VID in the name.
523                  * Name will look like:  vlan5
524                  */
525                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
526                 break;
527         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
528                 /* Put our vlan.VID in the name.
529                  * Name will look like:  eth0.5
530                  */
531                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
532                 break;
533         case VLAN_NAME_TYPE_PLUS_VID:
534                 /* Put our vlan.VID in the name.
535                  * Name will look like:  vlan0005
536                  */
537         default:
538                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
539         }
540
541         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
542                                vlan_setup);
543
544         if (new_dev == NULL)
545                 return -ENOBUFS;
546
547         /* need 4 bytes for extra VLAN header info,
548          * hope the underlying device can handle it.
549          */
550         new_dev->mtu = real_dev->mtu;
551
552 #ifdef VLAN_DEBUG
553         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
554         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
555                      new_dev->priv,
556                      sizeof(struct vlan_dev_info));
557 #endif
558
559         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
560         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
561         VLAN_DEV_INFO(new_dev)->dent = NULL;
562         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
563
564         new_dev->rtnl_link_ops = &vlan_link_ops;
565         err = register_vlan_dev(new_dev);
566         if (err < 0)
567                 goto out_free_newdev;
568
569 #ifdef VLAN_DEBUG
570         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
571 #endif
572         return 0;
573
574 out_free_newdev:
575         free_netdev(new_dev);
576         return err;
577 }
578
579 static void vlan_sync_address(struct net_device *dev,
580                               struct net_device *vlandev)
581 {
582         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
583
584         /* May be called without an actual change */
585         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
586                 return;
587
588         /* vlan address was different from the old address and is equal to
589          * the new address */
590         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
591             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
592                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
593
594         /* vlan address was equal to the old address and is different from
595          * the new address */
596         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
597             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
598                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
599
600         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
601 }
602
603 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
604 {
605         struct net_device *dev = ptr;
606         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
607         int i, flgs;
608         struct net_device *vlandev;
609
610         if (dev->nd_net != &init_net)
611                 return NOTIFY_DONE;
612
613         if (!grp)
614                 goto out;
615
616         /* It is OK that we do not hold the group lock right now,
617          * as we run under the RTNL lock.
618          */
619
620         switch (event) {
621         case NETDEV_CHANGE:
622                 /* Propagate real device state to vlan devices */
623                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
624                         vlandev = vlan_group_get_device(grp, i);
625                         if (!vlandev)
626                                 continue;
627
628                         vlan_transfer_operstate(dev, vlandev);
629                 }
630                 break;
631
632         case NETDEV_CHANGEADDR:
633                 /* Adjust unicast filters on underlying device */
634                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
635                         vlandev = vlan_group_get_device(grp, i);
636                         if (!vlandev)
637                                 continue;
638
639                         vlan_sync_address(dev, vlandev);
640                 }
641                 break;
642
643         case NETDEV_DOWN:
644                 /* Put all VLANs for this dev in the down state too.  */
645                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
646                         vlandev = vlan_group_get_device(grp, i);
647                         if (!vlandev)
648                                 continue;
649
650                         flgs = vlandev->flags;
651                         if (!(flgs & IFF_UP))
652                                 continue;
653
654                         dev_change_flags(vlandev, flgs & ~IFF_UP);
655                 }
656                 break;
657
658         case NETDEV_UP:
659                 /* Put all VLANs for this dev in the up state too.  */
660                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
661                         vlandev = vlan_group_get_device(grp, i);
662                         if (!vlandev)
663                                 continue;
664
665                         flgs = vlandev->flags;
666                         if (flgs & IFF_UP)
667                                 continue;
668
669                         dev_change_flags(vlandev, flgs | IFF_UP);
670                 }
671                 break;
672
673         case NETDEV_UNREGISTER:
674                 /* Delete all VLANs for this dev. */
675                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
676                         int ret;
677
678                         vlandev = vlan_group_get_device(grp, i);
679                         if (!vlandev)
680                                 continue;
681
682                         ret = unregister_vlan_dev(dev,
683                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
684
685                         unregister_netdevice(vlandev);
686
687                         /* Group was destroyed? */
688                         if (ret == 1)
689                                 break;
690                 }
691                 break;
692         }
693
694 out:
695         return NOTIFY_DONE;
696 }
697
698 /*
699  *      VLAN IOCTL handler.
700  *      o execute requested action or pass command to the device driver
701  *   arg is really a struct vlan_ioctl_args __user *.
702  */
703 static int vlan_ioctl_handler(struct net *net, void __user *arg)
704 {
705         int err;
706         unsigned short vid = 0;
707         struct vlan_ioctl_args args;
708         struct net_device *dev = NULL;
709
710         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
711                 return -EFAULT;
712
713         /* Null terminate this sucker, just in case. */
714         args.device1[23] = 0;
715         args.u.device2[23] = 0;
716
717 #ifdef VLAN_DEBUG
718         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
719 #endif
720
721         rtnl_lock();
722
723         switch (args.cmd) {
724         case SET_VLAN_INGRESS_PRIORITY_CMD:
725         case SET_VLAN_EGRESS_PRIORITY_CMD:
726         case SET_VLAN_FLAG_CMD:
727         case ADD_VLAN_CMD:
728         case DEL_VLAN_CMD:
729         case GET_VLAN_REALDEV_NAME_CMD:
730         case GET_VLAN_VID_CMD:
731                 err = -ENODEV;
732                 dev = __dev_get_by_name(&init_net, args.device1);
733                 if (!dev)
734                         goto out;
735
736                 err = -EINVAL;
737                 if (args.cmd != ADD_VLAN_CMD &&
738                     !(dev->priv_flags & IFF_802_1Q_VLAN))
739                         goto out;
740         }
741
742         switch (args.cmd) {
743         case SET_VLAN_INGRESS_PRIORITY_CMD:
744                 err = -EPERM;
745                 if (!capable(CAP_NET_ADMIN))
746                         break;
747                 vlan_dev_set_ingress_priority(dev,
748                                               args.u.skb_priority,
749                                               args.vlan_qos);
750                 break;
751
752         case SET_VLAN_EGRESS_PRIORITY_CMD:
753                 err = -EPERM;
754                 if (!capable(CAP_NET_ADMIN))
755                         break;
756                 err = vlan_dev_set_egress_priority(dev,
757                                                    args.u.skb_priority,
758                                                    args.vlan_qos);
759                 break;
760
761         case SET_VLAN_FLAG_CMD:
762                 err = -EPERM;
763                 if (!capable(CAP_NET_ADMIN))
764                         break;
765                 err = vlan_dev_set_vlan_flag(dev,
766                                              args.u.flag,
767                                              args.vlan_qos);
768                 break;
769
770         case SET_VLAN_NAME_TYPE_CMD:
771                 err = -EPERM;
772                 if (!capable(CAP_NET_ADMIN))
773                         return -EPERM;
774                 if ((args.u.name_type >= 0) &&
775                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
776                         vlan_name_type = args.u.name_type;
777                         err = 0;
778                 } else {
779                         err = -EINVAL;
780                 }
781                 break;
782
783         case ADD_VLAN_CMD:
784                 err = -EPERM;
785                 if (!capable(CAP_NET_ADMIN))
786                         break;
787                 err = register_vlan_device(dev, args.u.VID);
788                 break;
789
790         case DEL_VLAN_CMD:
791                 err = -EPERM;
792                 if (!capable(CAP_NET_ADMIN))
793                         break;
794                 err = unregister_vlan_device(dev);
795                 break;
796
797         case GET_VLAN_INGRESS_PRIORITY_CMD:
798                 /* TODO:  Implement
799                    err = vlan_dev_get_ingress_priority(args);
800                    if (copy_to_user((void*)arg, &args,
801                         sizeof(struct vlan_ioctl_args))) {
802                         err = -EFAULT;
803                    }
804                 */
805                 err = -EINVAL;
806                 break;
807         case GET_VLAN_EGRESS_PRIORITY_CMD:
808                 /* TODO:  Implement
809                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
810                    if (copy_to_user((void*)arg, &args,
811                         sizeof(struct vlan_ioctl_args))) {
812                         err = -EFAULT;
813                    }
814                 */
815                 err = -EINVAL;
816                 break;
817         case GET_VLAN_REALDEV_NAME_CMD:
818                 err = 0;
819                 vlan_dev_get_realdev_name(dev, args.u.device2);
820                 if (copy_to_user(arg, &args,
821                                  sizeof(struct vlan_ioctl_args))) {
822                         err = -EFAULT;
823                 }
824                 break;
825
826         case GET_VLAN_VID_CMD:
827                 err = 0;
828                 vlan_dev_get_vid(dev, &vid);
829                 args.u.VID = vid;
830                 if (copy_to_user(arg, &args,
831                                  sizeof(struct vlan_ioctl_args))) {
832                       err = -EFAULT;
833                 }
834                 break;
835
836         default:
837                 /* pass on to underlying device instead?? */
838                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
839                         __FUNCTION__, args.cmd);
840                 err = -EINVAL;
841                 break;
842         }
843 out:
844         rtnl_unlock();
845         return err;
846 }
847
848 MODULE_LICENSE("GPL");
849 MODULE_VERSION(DRV_VERSION);