f2bee234d361ae7ef0b957ea5398393333eefbb0
[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         if (is_zero_ether_addr(dev->dev_addr))
335                 memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
336         if (is_zero_ether_addr(dev->broadcast))
337                 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
338
339         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
340                 dev->header_ops      = real_dev->header_ops;
341                 dev->hard_header_len = real_dev->hard_header_len;
342                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
343         } else {
344                 dev->header_ops      = &vlan_header_ops;
345                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
346                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
347         }
348
349         lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
350         return 0;
351 }
352
353 void vlan_setup(struct net_device *new_dev)
354 {
355         ether_setup(new_dev);
356
357         /* new_dev->ifindex = 0;  it will be set when added to
358          * the global list.
359          * iflink is set as well.
360          */
361         new_dev->get_stats = vlan_dev_get_stats;
362
363         /* Make this thing known as a VLAN device */
364         new_dev->priv_flags |= IFF_802_1Q_VLAN;
365
366         /* Set us up to have no queue, as the underlying Hardware device
367          * can do all the queueing we could want.
368          */
369         new_dev->tx_queue_len = 0;
370
371         /* set up method calls */
372         new_dev->change_mtu = vlan_dev_change_mtu;
373         new_dev->init = vlan_dev_init;
374         new_dev->open = vlan_dev_open;
375         new_dev->stop = vlan_dev_stop;
376         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
377         new_dev->change_rx_flags = vlan_change_rx_flags;
378         new_dev->destructor = free_netdev;
379         new_dev->do_ioctl = vlan_dev_ioctl;
380
381         memset(new_dev->broadcast, 0, ETH_ALEN);
382 }
383
384 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
385 {
386         /* Have to respect userspace enforced dormant state
387          * of real device, also must allow supplicant running
388          * on VLAN device
389          */
390         if (dev->operstate == IF_OPER_DORMANT)
391                 netif_dormant_on(vlandev);
392         else
393                 netif_dormant_off(vlandev);
394
395         if (netif_carrier_ok(dev)) {
396                 if (!netif_carrier_ok(vlandev))
397                         netif_carrier_on(vlandev);
398         } else {
399                 if (netif_carrier_ok(vlandev))
400                         netif_carrier_off(vlandev);
401         }
402 }
403
404 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
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                 return -EOPNOTSUPP;
410         }
411
412         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
413             !real_dev->vlan_rx_register) {
414                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
415                         __FUNCTION__, real_dev->name);
416                 return -EOPNOTSUPP;
417         }
418
419         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
420             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
421                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
422                         __FUNCTION__, real_dev->name);
423                 return -EOPNOTSUPP;
424         }
425
426         /* The real device must be up and operating in order to
427          * assosciate a VLAN device with it.
428          */
429         if (!(real_dev->flags & IFF_UP))
430                 return -ENETDOWN;
431
432         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
433                 /* was already registered. */
434                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
435                 return -EEXIST;
436         }
437
438         return 0;
439 }
440
441 int register_vlan_dev(struct net_device *dev)
442 {
443         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
444         struct net_device *real_dev = vlan->real_dev;
445         unsigned short vlan_id = vlan->vlan_id;
446         struct vlan_group *grp, *ngrp = NULL;
447         int err;
448
449         grp = __vlan_find_group(real_dev->ifindex);
450         if (!grp) {
451                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
452                 if (!grp)
453                         return -ENOBUFS;
454         }
455
456         err = register_netdevice(dev);
457         if (err < 0)
458                 goto out_free_group;
459
460         /* Account for reference in struct vlan_dev_info */
461         dev_hold(real_dev);
462
463         vlan_transfer_operstate(real_dev, dev);
464         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
465
466         /* So, got the sucker initialized, now lets place
467          * it into our local structure.
468          */
469         vlan_group_set_device(grp, vlan_id, dev);
470         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
471                 real_dev->vlan_rx_register(real_dev, ngrp);
472         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
473                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
474
475         if (vlan_proc_add_dev(dev) < 0)
476                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
477                        dev->name);
478         return 0;
479
480 out_free_group:
481         if (ngrp)
482                 vlan_group_free(ngrp);
483         return err;
484 }
485
486 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
487  *  Returns 0 if the device was created or a negative error code otherwise.
488  */
489 static int register_vlan_device(struct net_device *real_dev,
490                                 unsigned short VLAN_ID)
491 {
492         struct net_device *new_dev;
493         char name[IFNAMSIZ];
494         int err;
495
496 #ifdef VLAN_DEBUG
497         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
498                 __FUNCTION__, eth_IF_name, VLAN_ID);
499 #endif
500
501         if (VLAN_ID >= VLAN_VID_MASK)
502                 return -ERANGE;
503
504         err = vlan_check_real_dev(real_dev, VLAN_ID);
505         if (err < 0)
506                 return err;
507
508         /* Gotta set up the fields for the device. */
509 #ifdef VLAN_DEBUG
510         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
511                vlan_name_type);
512 #endif
513         switch (vlan_name_type) {
514         case VLAN_NAME_TYPE_RAW_PLUS_VID:
515                 /* name will look like:  eth1.0005 */
516                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
517                 break;
518         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
519                 /* Put our vlan.VID in the name.
520                  * Name will look like:  vlan5
521                  */
522                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
523                 break;
524         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
525                 /* Put our vlan.VID in the name.
526                  * Name will look like:  eth0.5
527                  */
528                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
529                 break;
530         case VLAN_NAME_TYPE_PLUS_VID:
531                 /* Put our vlan.VID in the name.
532                  * Name will look like:  vlan0005
533                  */
534         default:
535                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
536         }
537
538         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
539                                vlan_setup);
540
541         if (new_dev == NULL)
542                 return -ENOBUFS;
543
544         /* need 4 bytes for extra VLAN header info,
545          * hope the underlying device can handle it.
546          */
547         new_dev->mtu = real_dev->mtu;
548
549 #ifdef VLAN_DEBUG
550         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
551         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
552                      new_dev->priv,
553                      sizeof(struct vlan_dev_info));
554 #endif
555
556         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
557         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
558         VLAN_DEV_INFO(new_dev)->dent = NULL;
559         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
560
561         new_dev->rtnl_link_ops = &vlan_link_ops;
562         err = register_vlan_dev(new_dev);
563         if (err < 0)
564                 goto out_free_newdev;
565
566 #ifdef VLAN_DEBUG
567         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
568 #endif
569         return 0;
570
571 out_free_newdev:
572         free_netdev(new_dev);
573         return err;
574 }
575
576 static void vlan_sync_address(struct net_device *dev,
577                               struct net_device *vlandev)
578 {
579         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
580
581         /* May be called without an actual change */
582         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
583                 return;
584
585         /* vlan address was different from the old address and is equal to
586          * the new address */
587         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
588             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
589                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
590
591         /* vlan address was equal to the old address and is different from
592          * the new address */
593         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
594             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
595                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
596
597         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
598 }
599
600 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
601 {
602         struct net_device *dev = ptr;
603         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
604         int i, flgs;
605         struct net_device *vlandev;
606
607         if (dev->nd_net != &init_net)
608                 return NOTIFY_DONE;
609
610         if (!grp)
611                 goto out;
612
613         /* It is OK that we do not hold the group lock right now,
614          * as we run under the RTNL lock.
615          */
616
617         switch (event) {
618         case NETDEV_CHANGE:
619                 /* Propagate real device state to vlan devices */
620                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
621                         vlandev = vlan_group_get_device(grp, i);
622                         if (!vlandev)
623                                 continue;
624
625                         vlan_transfer_operstate(dev, vlandev);
626                 }
627                 break;
628
629         case NETDEV_CHANGEADDR:
630                 /* Adjust unicast filters on underlying device */
631                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
632                         vlandev = vlan_group_get_device(grp, i);
633                         if (!vlandev)
634                                 continue;
635
636                         vlan_sync_address(dev, vlandev);
637                 }
638                 break;
639
640         case NETDEV_DOWN:
641                 /* Put all VLANs for this dev in the down state too.  */
642                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
643                         vlandev = vlan_group_get_device(grp, i);
644                         if (!vlandev)
645                                 continue;
646
647                         flgs = vlandev->flags;
648                         if (!(flgs & IFF_UP))
649                                 continue;
650
651                         dev_change_flags(vlandev, flgs & ~IFF_UP);
652                 }
653                 break;
654
655         case NETDEV_UP:
656                 /* Put all VLANs for this dev in the up state too.  */
657                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
658                         vlandev = vlan_group_get_device(grp, i);
659                         if (!vlandev)
660                                 continue;
661
662                         flgs = vlandev->flags;
663                         if (flgs & IFF_UP)
664                                 continue;
665
666                         dev_change_flags(vlandev, flgs | IFF_UP);
667                 }
668                 break;
669
670         case NETDEV_UNREGISTER:
671                 /* Delete all VLANs for this dev. */
672                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
673                         int ret;
674
675                         vlandev = vlan_group_get_device(grp, i);
676                         if (!vlandev)
677                                 continue;
678
679                         ret = unregister_vlan_dev(dev,
680                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
681
682                         unregister_netdevice(vlandev);
683
684                         /* Group was destroyed? */
685                         if (ret == 1)
686                                 break;
687                 }
688                 break;
689         }
690
691 out:
692         return NOTIFY_DONE;
693 }
694
695 /*
696  *      VLAN IOCTL handler.
697  *      o execute requested action or pass command to the device driver
698  *   arg is really a struct vlan_ioctl_args __user *.
699  */
700 static int vlan_ioctl_handler(struct net *net, void __user *arg)
701 {
702         int err;
703         unsigned short vid = 0;
704         struct vlan_ioctl_args args;
705         struct net_device *dev = NULL;
706
707         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
708                 return -EFAULT;
709
710         /* Null terminate this sucker, just in case. */
711         args.device1[23] = 0;
712         args.u.device2[23] = 0;
713
714 #ifdef VLAN_DEBUG
715         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
716 #endif
717
718         rtnl_lock();
719
720         switch (args.cmd) {
721         case SET_VLAN_INGRESS_PRIORITY_CMD:
722         case SET_VLAN_EGRESS_PRIORITY_CMD:
723         case SET_VLAN_FLAG_CMD:
724         case ADD_VLAN_CMD:
725         case DEL_VLAN_CMD:
726         case GET_VLAN_REALDEV_NAME_CMD:
727         case GET_VLAN_VID_CMD:
728                 err = -ENODEV;
729                 dev = __dev_get_by_name(&init_net, args.device1);
730                 if (!dev)
731                         goto out;
732
733                 err = -EINVAL;
734                 if (args.cmd != ADD_VLAN_CMD &&
735                     !(dev->priv_flags & IFF_802_1Q_VLAN))
736                         goto out;
737         }
738
739         switch (args.cmd) {
740         case SET_VLAN_INGRESS_PRIORITY_CMD:
741                 err = -EPERM;
742                 if (!capable(CAP_NET_ADMIN))
743                         break;
744                 vlan_dev_set_ingress_priority(dev,
745                                               args.u.skb_priority,
746                                               args.vlan_qos);
747                 break;
748
749         case SET_VLAN_EGRESS_PRIORITY_CMD:
750                 err = -EPERM;
751                 if (!capable(CAP_NET_ADMIN))
752                         break;
753                 err = vlan_dev_set_egress_priority(dev,
754                                                    args.u.skb_priority,
755                                                    args.vlan_qos);
756                 break;
757
758         case SET_VLAN_FLAG_CMD:
759                 err = -EPERM;
760                 if (!capable(CAP_NET_ADMIN))
761                         break;
762                 err = vlan_dev_set_vlan_flag(dev,
763                                              args.u.flag,
764                                              args.vlan_qos);
765                 break;
766
767         case SET_VLAN_NAME_TYPE_CMD:
768                 err = -EPERM;
769                 if (!capable(CAP_NET_ADMIN))
770                         return -EPERM;
771                 if ((args.u.name_type >= 0) &&
772                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
773                         vlan_name_type = args.u.name_type;
774                         err = 0;
775                 } else {
776                         err = -EINVAL;
777                 }
778                 break;
779
780         case ADD_VLAN_CMD:
781                 err = -EPERM;
782                 if (!capable(CAP_NET_ADMIN))
783                         break;
784                 err = register_vlan_device(dev, args.u.VID);
785                 break;
786
787         case DEL_VLAN_CMD:
788                 err = -EPERM;
789                 if (!capable(CAP_NET_ADMIN))
790                         break;
791                 err = unregister_vlan_device(dev);
792                 break;
793
794         case GET_VLAN_INGRESS_PRIORITY_CMD:
795                 /* TODO:  Implement
796                    err = vlan_dev_get_ingress_priority(args);
797                    if (copy_to_user((void*)arg, &args,
798                         sizeof(struct vlan_ioctl_args))) {
799                         err = -EFAULT;
800                    }
801                 */
802                 err = -EINVAL;
803                 break;
804         case GET_VLAN_EGRESS_PRIORITY_CMD:
805                 /* TODO:  Implement
806                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
807                    if (copy_to_user((void*)arg, &args,
808                         sizeof(struct vlan_ioctl_args))) {
809                         err = -EFAULT;
810                    }
811                 */
812                 err = -EINVAL;
813                 break;
814         case GET_VLAN_REALDEV_NAME_CMD:
815                 err = 0;
816                 vlan_dev_get_realdev_name(dev, args.u.device2);
817                 if (copy_to_user(arg, &args,
818                                  sizeof(struct vlan_ioctl_args))) {
819                         err = -EFAULT;
820                 }
821                 break;
822
823         case GET_VLAN_VID_CMD:
824                 err = 0;
825                 vlan_dev_get_vid(dev, &vid);
826                 args.u.VID = vid;
827                 if (copy_to_user(arg, &args,
828                                  sizeof(struct vlan_ioctl_args))) {
829                       err = -EFAULT;
830                 }
831                 break;
832
833         default:
834                 /* pass on to underlying device instead?? */
835                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
836                         __FUNCTION__, args.cmd);
837                 err = -EINVAL;
838                 break;
839         }
840 out:
841         rtnl_unlock();
842         return err;
843 }
844
845 MODULE_LICENSE("GPL");
846 MODULE_VERSION(DRV_VERSION);