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