e7583eea6fda47a32cad11bcce71a24c917460ef
[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                 goto err1;
102
103         err = vlan_netlink_init();
104         if (err < 0)
105                 goto err2;
106
107         vlan_ioctl_set(vlan_ioctl_handler);
108         return 0;
109
110 err2:
111         unregister_netdevice_notifier(&vlan_notifier_block);
112 err1:
113         vlan_proc_cleanup();
114         dev_remove_pack(&vlan_packet_type);
115         return err;
116 }
117
118 /* Cleanup all vlan devices
119  * Note: devices that have been registered that but not
120  * brought up will exist but have no module ref count.
121  */
122 static void __exit vlan_cleanup_devices(void)
123 {
124         struct net_device *dev, *nxt;
125
126         rtnl_lock();
127         for_each_netdev_safe(dev, nxt) {
128                 if (dev->priv_flags & IFF_802_1Q_VLAN) {
129                         unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
130                                             VLAN_DEV_INFO(dev)->vlan_id);
131
132                         unregister_netdevice(dev);
133                 }
134         }
135         rtnl_unlock();
136 }
137
138 /*
139  *     Module 'remove' entry point.
140  *     o delete /proc/net/router directory and static entries.
141  */
142 static void __exit vlan_cleanup_module(void)
143 {
144         int i;
145
146         vlan_netlink_fini();
147         vlan_ioctl_set(NULL);
148
149         /* Un-register us from receiving netdevice events */
150         unregister_netdevice_notifier(&vlan_notifier_block);
151
152         dev_remove_pack(&vlan_packet_type);
153         vlan_cleanup_devices();
154
155         /* This table must be empty if there are no module
156          * references left.
157          */
158         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++) {
159                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
160         }
161         vlan_proc_cleanup();
162
163         synchronize_net();
164 }
165
166 module_init(vlan_proto_init);
167 module_exit(vlan_cleanup_module);
168
169 /* Must be invoked with RCU read lock (no preempt) */
170 static struct vlan_group *__vlan_find_group(int real_dev_ifindex)
171 {
172         struct vlan_group *grp;
173         struct hlist_node *n;
174         int hash = vlan_grp_hashfn(real_dev_ifindex);
175
176         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
177                 if (grp->real_dev_ifindex == real_dev_ifindex)
178                         return grp;
179         }
180
181         return NULL;
182 }
183
184 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
185  *
186  * Must be invoked with RCU read lock (no preempt)
187  */
188 struct net_device *__find_vlan_dev(struct net_device *real_dev,
189                                    unsigned short VID)
190 {
191         struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
192
193         if (grp)
194                 return vlan_group_get_device(grp, VID);
195
196         return NULL;
197 }
198
199 static void vlan_group_free(struct vlan_group *grp)
200 {
201         int i;
202
203         for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
204                 kfree(grp->vlan_devices_arrays[i]);
205         kfree(grp);
206 }
207
208 static struct vlan_group *vlan_group_alloc(int ifindex)
209 {
210         struct vlan_group *grp;
211         unsigned int size;
212         unsigned int i;
213
214         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
215         if (!grp)
216                 return NULL;
217
218         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
219
220         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
221                 grp->vlan_devices_arrays[i] = kzalloc(size, GFP_KERNEL);
222                 if (!grp->vlan_devices_arrays[i])
223                         goto err;
224         }
225
226         grp->real_dev_ifindex = ifindex;
227         hlist_add_head_rcu(&grp->hlist,
228                            &vlan_group_hash[vlan_grp_hashfn(ifindex)]);
229         return grp;
230
231 err:
232         vlan_group_free(grp);
233         return NULL;
234 }
235
236 static void vlan_rcu_free(struct rcu_head *rcu)
237 {
238         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
239 }
240
241
242 /* This returns 0 if everything went fine.
243  * It will return 1 if the group was killed as a result.
244  * A negative return indicates failure.
245  *
246  * The RTNL lock must be held.
247  */
248 static int unregister_vlan_dev(struct net_device *real_dev,
249                                unsigned short vlan_id)
250 {
251         struct net_device *dev = NULL;
252         int real_dev_ifindex = real_dev->ifindex;
253         struct vlan_group *grp;
254         int i, ret;
255
256 #ifdef VLAN_DEBUG
257         printk(VLAN_DBG "%s: VID: %i\n", __FUNCTION__, vlan_id);
258 #endif
259
260         /* sanity check */
261         if (vlan_id >= VLAN_VID_MASK)
262                 return -EINVAL;
263
264         ASSERT_RTNL();
265         grp = __vlan_find_group(real_dev_ifindex);
266
267         ret = 0;
268
269         if (grp) {
270                 dev = vlan_group_get_device(grp, vlan_id);
271                 if (dev) {
272                         /* Remove proc entry */
273                         vlan_proc_rem_dev(dev);
274
275                         /* Take it out of our own structures, but be sure to
276                          * interlock with HW accelerating devices or SW vlan
277                          * input packet processing.
278                          */
279                         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
280                                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
281
282                         vlan_group_set_device(grp, vlan_id, NULL);
283                         synchronize_net();
284
285
286                         /* Caller unregisters (and if necessary, puts)
287                          * VLAN device, but we get rid of the reference to
288                          * real_dev here.
289                          */
290                         dev_put(real_dev);
291
292                         /* If the group is now empty, kill off the
293                          * group.
294                          */
295                         for (i = 0; i < VLAN_VID_MASK; i++)
296                                 if (vlan_group_get_device(grp, i))
297                                         break;
298
299                         if (i == VLAN_VID_MASK) {
300                                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
301                                         real_dev->vlan_rx_register(real_dev, NULL);
302
303                                 hlist_del_rcu(&grp->hlist);
304
305                                 /* Free the group, after all cpu's are done. */
306                                 call_rcu(&grp->rcu, vlan_rcu_free);
307
308                                 grp = NULL;
309                                 ret = 1;
310                         }
311                 }
312         }
313
314         return ret;
315 }
316
317 int unregister_vlan_device(struct net_device *dev)
318 {
319         int ret;
320
321         ret = unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
322                                   VLAN_DEV_INFO(dev)->vlan_id);
323         unregister_netdevice(dev);
324
325         if (ret == 1)
326                 ret = 0;
327         return ret;
328 }
329
330 /*
331  * vlan network devices have devices nesting below it, and are a special
332  * "super class" of normal network devices; split their locks off into a
333  * separate class since they always nest.
334  */
335 static struct lock_class_key vlan_netdev_xmit_lock_key;
336
337 static int vlan_dev_init(struct net_device *dev)
338 {
339         struct net_device *real_dev = VLAN_DEV_INFO(dev)->real_dev;
340
341         /* IFF_BROADCAST|IFF_MULTICAST; ??? */
342         dev->flags  = real_dev->flags & ~IFF_UP;
343         dev->iflink = real_dev->ifindex;
344         dev->state  = (real_dev->state & ((1<<__LINK_STATE_NOCARRIER) |
345                                           (1<<__LINK_STATE_DORMANT))) |
346                       (1<<__LINK_STATE_PRESENT);
347
348         /* TODO: maybe just assign it to be ETHERNET? */
349         dev->type = real_dev->type;
350
351         memcpy(dev->broadcast, real_dev->broadcast, real_dev->addr_len);
352         memcpy(dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
353         dev->addr_len = real_dev->addr_len;
354
355         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
356                 dev->hard_header     = real_dev->hard_header;
357                 dev->hard_header_len = real_dev->hard_header_len;
358                 dev->hard_start_xmit = vlan_dev_hwaccel_hard_start_xmit;
359                 dev->rebuild_header  = real_dev->rebuild_header;
360         } else {
361                 dev->hard_header     = vlan_dev_hard_header;
362                 dev->hard_header_len = real_dev->hard_header_len + VLAN_HLEN;
363                 dev->hard_start_xmit = vlan_dev_hard_start_xmit;
364                 dev->rebuild_header  = vlan_dev_rebuild_header;
365         }
366         dev->hard_header_parse = real_dev->hard_header_parse;
367
368         lockdep_set_class(&dev->_xmit_lock, &vlan_netdev_xmit_lock_key);
369         return 0;
370 }
371
372 void vlan_setup(struct net_device *new_dev)
373 {
374         SET_MODULE_OWNER(new_dev);
375
376         /* new_dev->ifindex = 0;  it will be set when added to
377          * the global list.
378          * iflink is set as well.
379          */
380         new_dev->get_stats = vlan_dev_get_stats;
381
382         /* Make this thing known as a VLAN device */
383         new_dev->priv_flags |= IFF_802_1Q_VLAN;
384
385         /* Set us up to have no queue, as the underlying Hardware device
386          * can do all the queueing we could want.
387          */
388         new_dev->tx_queue_len = 0;
389
390         /* set up method calls */
391         new_dev->change_mtu = vlan_dev_change_mtu;
392         new_dev->init = vlan_dev_init;
393         new_dev->open = vlan_dev_open;
394         new_dev->stop = vlan_dev_stop;
395         new_dev->set_mac_address = vlan_dev_set_mac_address;
396         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
397         new_dev->destructor = free_netdev;
398         new_dev->do_ioctl = vlan_dev_ioctl;
399 }
400
401 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
402 {
403         /* Have to respect userspace enforced dormant state
404          * of real device, also must allow supplicant running
405          * on VLAN device
406          */
407         if (dev->operstate == IF_OPER_DORMANT)
408                 netif_dormant_on(vlandev);
409         else
410                 netif_dormant_off(vlandev);
411
412         if (netif_carrier_ok(dev)) {
413                 if (!netif_carrier_ok(vlandev))
414                         netif_carrier_on(vlandev);
415         } else {
416                 if (netif_carrier_ok(vlandev))
417                         netif_carrier_off(vlandev);
418         }
419 }
420
421 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
422 {
423         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
424                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
425                         __FUNCTION__, real_dev->name);
426                 return -EOPNOTSUPP;
427         }
428
429         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
430             !real_dev->vlan_rx_register) {
431                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
432                         __FUNCTION__, real_dev->name);
433                 return -EOPNOTSUPP;
434         }
435
436         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
437             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
438                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
439                         __FUNCTION__, real_dev->name);
440                 return -EOPNOTSUPP;
441         }
442
443         /* The real device must be up and operating in order to
444          * assosciate a VLAN device with it.
445          */
446         if (!(real_dev->flags & IFF_UP))
447                 return -ENETDOWN;
448
449         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
450                 /* was already registered. */
451                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
452                 return -EEXIST;
453         }
454
455         return 0;
456 }
457
458 int register_vlan_dev(struct net_device *dev)
459 {
460         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
461         struct net_device *real_dev = vlan->real_dev;
462         unsigned short vlan_id = vlan->vlan_id;
463         struct vlan_group *grp, *ngrp = NULL;
464         int err;
465
466         grp = __vlan_find_group(real_dev->ifindex);
467         if (!grp) {
468                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
469                 if (!grp)
470                         return -ENOBUFS;
471         }
472
473         err = register_netdevice(dev);
474         if (err < 0)
475                 goto out_free_group;
476
477         /* Account for reference in struct vlan_dev_info */
478         dev_hold(real_dev);
479
480         vlan_transfer_operstate(real_dev, dev);
481         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
482
483         /* So, got the sucker initialized, now lets place
484          * it into our local structure.
485          */
486         vlan_group_set_device(grp, vlan_id, dev);
487         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
488                 real_dev->vlan_rx_register(real_dev, ngrp);
489         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
490                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
491
492         if (vlan_proc_add_dev(dev) < 0)
493                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
494                        dev->name);
495         return 0;
496
497 out_free_group:
498         if (ngrp)
499                 vlan_group_free(ngrp);
500         return err;
501 }
502
503 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
504  *  Returns 0 if the device was created or a negative error code otherwise.
505  */
506 static int register_vlan_device(struct net_device *real_dev,
507                                 unsigned short VLAN_ID)
508 {
509         struct net_device *new_dev;
510         char name[IFNAMSIZ];
511         int err;
512
513 #ifdef VLAN_DEBUG
514         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
515                 __FUNCTION__, eth_IF_name, VLAN_ID);
516 #endif
517
518         if (VLAN_ID >= VLAN_VID_MASK)
519                 return -ERANGE;
520
521         err = vlan_check_real_dev(real_dev, VLAN_ID);
522         if (err < 0)
523                 return err;
524
525         /* Gotta set up the fields for the device. */
526 #ifdef VLAN_DEBUG
527         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
528                vlan_name_type);
529 #endif
530         switch (vlan_name_type) {
531         case VLAN_NAME_TYPE_RAW_PLUS_VID:
532                 /* name will look like:  eth1.0005 */
533                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
534                 break;
535         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
536                 /* Put our vlan.VID in the name.
537                  * Name will look like:  vlan5
538                  */
539                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
540                 break;
541         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
542                 /* Put our vlan.VID in the name.
543                  * Name will look like:  eth0.5
544                  */
545                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
546                 break;
547         case VLAN_NAME_TYPE_PLUS_VID:
548                 /* Put our vlan.VID in the name.
549                  * Name will look like:  vlan0005
550                  */
551         default:
552                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
553         }
554
555         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
556                                vlan_setup);
557
558         if (new_dev == NULL)
559                 return -ENOBUFS;
560
561         /* need 4 bytes for extra VLAN header info,
562          * hope the underlying device can handle it.
563          */
564         new_dev->mtu = real_dev->mtu;
565
566 #ifdef VLAN_DEBUG
567         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
568         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
569                      new_dev->priv,
570                      sizeof(struct vlan_dev_info));
571 #endif
572
573         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
574         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
575         VLAN_DEV_INFO(new_dev)->dent = NULL;
576         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
577
578         new_dev->rtnl_link_ops = &vlan_link_ops;
579         err = register_vlan_dev(new_dev);
580         if (err < 0)
581                 goto out_free_newdev;
582
583         /* Account for reference in struct vlan_dev_info */
584         dev_hold(real_dev);
585 #ifdef VLAN_DEBUG
586         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
587 #endif
588         return 0;
589
590 out_free_newdev:
591         free_netdev(new_dev);
592         return err;
593 }
594
595 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
596 {
597         struct net_device *dev = ptr;
598         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
599         int i, flgs;
600         struct net_device *vlandev;
601
602         if (!grp)
603                 goto out;
604
605         /* It is OK that we do not hold the group lock right now,
606          * as we run under the RTNL lock.
607          */
608
609         switch (event) {
610         case NETDEV_CHANGE:
611                 /* Propagate real device state to vlan devices */
612                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
613                         vlandev = vlan_group_get_device(grp, i);
614                         if (!vlandev)
615                                 continue;
616
617                         vlan_transfer_operstate(dev, vlandev);
618                 }
619                 break;
620
621         case NETDEV_DOWN:
622                 /* Put all VLANs for this dev in the down state too.  */
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                         flgs = vlandev->flags;
629                         if (!(flgs & IFF_UP))
630                                 continue;
631
632                         dev_change_flags(vlandev, flgs & ~IFF_UP);
633                 }
634                 break;
635
636         case NETDEV_UP:
637                 /* Put all VLANs for this dev in the up state too.  */
638                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
639                         vlandev = vlan_group_get_device(grp, i);
640                         if (!vlandev)
641                                 continue;
642
643                         flgs = vlandev->flags;
644                         if (flgs & IFF_UP)
645                                 continue;
646
647                         dev_change_flags(vlandev, flgs | IFF_UP);
648                 }
649                 break;
650
651         case NETDEV_UNREGISTER:
652                 /* Delete all VLANs for this dev. */
653                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
654                         int ret;
655
656                         vlandev = vlan_group_get_device(grp, i);
657                         if (!vlandev)
658                                 continue;
659
660                         ret = unregister_vlan_dev(dev,
661                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
662
663                         unregister_netdevice(vlandev);
664
665                         /* Group was destroyed? */
666                         if (ret == 1)
667                                 break;
668                 }
669                 break;
670         }
671
672 out:
673         return NOTIFY_DONE;
674 }
675
676 /*
677  *      VLAN IOCTL handler.
678  *      o execute requested action or pass command to the device driver
679  *   arg is really a struct vlan_ioctl_args __user *.
680  */
681 static int vlan_ioctl_handler(void __user *arg)
682 {
683         int err;
684         unsigned short vid = 0;
685         struct vlan_ioctl_args args;
686         struct net_device *dev = NULL;
687
688         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
689                 return -EFAULT;
690
691         /* Null terminate this sucker, just in case. */
692         args.device1[23] = 0;
693         args.u.device2[23] = 0;
694
695 #ifdef VLAN_DEBUG
696         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
697 #endif
698
699         rtnl_lock();
700
701         switch (args.cmd) {
702         case SET_VLAN_INGRESS_PRIORITY_CMD:
703         case SET_VLAN_EGRESS_PRIORITY_CMD:
704         case SET_VLAN_FLAG_CMD:
705         case ADD_VLAN_CMD:
706         case DEL_VLAN_CMD:
707         case GET_VLAN_REALDEV_NAME_CMD:
708         case GET_VLAN_VID_CMD:
709                 err = -ENODEV;
710                 dev = __dev_get_by_name(args.device1);
711                 if (!dev)
712                         goto out;
713
714                 err = -EINVAL;
715                 if (args.cmd != ADD_VLAN_CMD &&
716                     !(dev->priv_flags & IFF_802_1Q_VLAN))
717                         goto out;
718         }
719
720         switch (args.cmd) {
721         case SET_VLAN_INGRESS_PRIORITY_CMD:
722                 err = -EPERM;
723                 if (!capable(CAP_NET_ADMIN))
724                         break;
725                 vlan_dev_set_ingress_priority(dev,
726                                               args.u.skb_priority,
727                                               args.vlan_qos);
728                 break;
729
730         case SET_VLAN_EGRESS_PRIORITY_CMD:
731                 err = -EPERM;
732                 if (!capable(CAP_NET_ADMIN))
733                         break;
734                 err = vlan_dev_set_egress_priority(dev,
735                                                    args.u.skb_priority,
736                                                    args.vlan_qos);
737                 break;
738
739         case SET_VLAN_FLAG_CMD:
740                 err = -EPERM;
741                 if (!capable(CAP_NET_ADMIN))
742                         break;
743                 err = vlan_dev_set_vlan_flag(dev,
744                                              args.u.flag,
745                                              args.vlan_qos);
746                 break;
747
748         case SET_VLAN_NAME_TYPE_CMD:
749                 err = -EPERM;
750                 if (!capable(CAP_NET_ADMIN))
751                         return -EPERM;
752                 if ((args.u.name_type >= 0) &&
753                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
754                         vlan_name_type = args.u.name_type;
755                         err = 0;
756                 } else {
757                         err = -EINVAL;
758                 }
759                 break;
760
761         case ADD_VLAN_CMD:
762                 err = -EPERM;
763                 if (!capable(CAP_NET_ADMIN))
764                         break;
765                 err = register_vlan_device(dev, args.u.VID);
766                 break;
767
768         case DEL_VLAN_CMD:
769                 err = -EPERM;
770                 if (!capable(CAP_NET_ADMIN))
771                         break;
772                 err = unregister_vlan_device(dev);
773                 break;
774
775         case GET_VLAN_INGRESS_PRIORITY_CMD:
776                 /* TODO:  Implement
777                    err = vlan_dev_get_ingress_priority(args);
778                    if (copy_to_user((void*)arg, &args,
779                         sizeof(struct vlan_ioctl_args))) {
780                         err = -EFAULT;
781                    }
782                 */
783                 err = -EINVAL;
784                 break;
785         case GET_VLAN_EGRESS_PRIORITY_CMD:
786                 /* TODO:  Implement
787                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
788                    if (copy_to_user((void*)arg, &args,
789                         sizeof(struct vlan_ioctl_args))) {
790                         err = -EFAULT;
791                    }
792                 */
793                 err = -EINVAL;
794                 break;
795         case GET_VLAN_REALDEV_NAME_CMD:
796                 vlan_dev_get_realdev_name(dev, args.u.device2);
797                 if (copy_to_user(arg, &args,
798                                  sizeof(struct vlan_ioctl_args))) {
799                         err = -EFAULT;
800                 }
801                 break;
802
803         case GET_VLAN_VID_CMD:
804                 vlan_dev_get_vid(dev, &vid);
805                 args.u.VID = vid;
806                 if (copy_to_user(arg, &args,
807                                  sizeof(struct vlan_ioctl_args))) {
808                       err = -EFAULT;
809                 }
810                 break;
811
812         default:
813                 /* pass on to underlying device instead?? */
814                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
815                         __FUNCTION__, args.cmd);
816                 err = -EINVAL;
817                 break;
818         }
819 out:
820         rtnl_unlock();
821         return err;
822 }
823
824 MODULE_LICENSE("GPL");
825 MODULE_VERSION(DRV_VERSION);