[VLAN]: Allow setting mac address while device is up
[linux-2.6] / 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_mac_address = vlan_set_mac_address;
380         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
381         new_dev->change_rx_flags = vlan_change_rx_flags;
382         new_dev->destructor = free_netdev;
383         new_dev->do_ioctl = vlan_dev_ioctl;
384
385         memset(new_dev->broadcast, 0, ETH_ALEN);
386 }
387
388 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
389 {
390         /* Have to respect userspace enforced dormant state
391          * of real device, also must allow supplicant running
392          * on VLAN device
393          */
394         if (dev->operstate == IF_OPER_DORMANT)
395                 netif_dormant_on(vlandev);
396         else
397                 netif_dormant_off(vlandev);
398
399         if (netif_carrier_ok(dev)) {
400                 if (!netif_carrier_ok(vlandev))
401                         netif_carrier_on(vlandev);
402         } else {
403                 if (netif_carrier_ok(vlandev))
404                         netif_carrier_off(vlandev);
405         }
406 }
407
408 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
409 {
410         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
411                 printk(VLAN_DBG "%s: VLANs not supported on %s.\n",
412                         __FUNCTION__, real_dev->name);
413                 return -EOPNOTSUPP;
414         }
415
416         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
417             !real_dev->vlan_rx_register) {
418                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
419                         __FUNCTION__, real_dev->name);
420                 return -EOPNOTSUPP;
421         }
422
423         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
424             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
425                 printk(VLAN_DBG "%s: Device %s has buggy VLAN hw accel.\n",
426                         __FUNCTION__, real_dev->name);
427                 return -EOPNOTSUPP;
428         }
429
430         /* The real device must be up and operating in order to
431          * assosciate a VLAN device with it.
432          */
433         if (!(real_dev->flags & IFF_UP))
434                 return -ENETDOWN;
435
436         if (__find_vlan_dev(real_dev, vlan_id) != NULL) {
437                 /* was already registered. */
438                 printk(VLAN_DBG "%s: ALREADY had VLAN registered\n", __FUNCTION__);
439                 return -EEXIST;
440         }
441
442         return 0;
443 }
444
445 int register_vlan_dev(struct net_device *dev)
446 {
447         struct vlan_dev_info *vlan = VLAN_DEV_INFO(dev);
448         struct net_device *real_dev = vlan->real_dev;
449         unsigned short vlan_id = vlan->vlan_id;
450         struct vlan_group *grp, *ngrp = NULL;
451         int err;
452
453         grp = __vlan_find_group(real_dev->ifindex);
454         if (!grp) {
455                 ngrp = grp = vlan_group_alloc(real_dev->ifindex);
456                 if (!grp)
457                         return -ENOBUFS;
458         }
459
460         err = register_netdevice(dev);
461         if (err < 0)
462                 goto out_free_group;
463
464         /* Account for reference in struct vlan_dev_info */
465         dev_hold(real_dev);
466
467         vlan_transfer_operstate(real_dev, dev);
468         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
469
470         /* So, got the sucker initialized, now lets place
471          * it into our local structure.
472          */
473         vlan_group_set_device(grp, vlan_id, dev);
474         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
475                 real_dev->vlan_rx_register(real_dev, ngrp);
476         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
477                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
478
479         if (vlan_proc_add_dev(dev) < 0)
480                 printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
481                        dev->name);
482         return 0;
483
484 out_free_group:
485         if (ngrp)
486                 vlan_group_free(ngrp);
487         return err;
488 }
489
490 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
491  *  Returns 0 if the device was created or a negative error code otherwise.
492  */
493 static int register_vlan_device(struct net_device *real_dev,
494                                 unsigned short VLAN_ID)
495 {
496         struct net_device *new_dev;
497         char name[IFNAMSIZ];
498         int err;
499
500 #ifdef VLAN_DEBUG
501         printk(VLAN_DBG "%s: if_name -:%s:-     vid: %i\n",
502                 __FUNCTION__, eth_IF_name, VLAN_ID);
503 #endif
504
505         if (VLAN_ID >= VLAN_VID_MASK)
506                 return -ERANGE;
507
508         err = vlan_check_real_dev(real_dev, VLAN_ID);
509         if (err < 0)
510                 return err;
511
512         /* Gotta set up the fields for the device. */
513 #ifdef VLAN_DEBUG
514         printk(VLAN_DBG "About to allocate name, vlan_name_type: %i\n",
515                vlan_name_type);
516 #endif
517         switch (vlan_name_type) {
518         case VLAN_NAME_TYPE_RAW_PLUS_VID:
519                 /* name will look like:  eth1.0005 */
520                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
521                 break;
522         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
523                 /* Put our vlan.VID in the name.
524                  * Name will look like:  vlan5
525                  */
526                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
527                 break;
528         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
529                 /* Put our vlan.VID in the name.
530                  * Name will look like:  eth0.5
531                  */
532                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
533                 break;
534         case VLAN_NAME_TYPE_PLUS_VID:
535                 /* Put our vlan.VID in the name.
536                  * Name will look like:  vlan0005
537                  */
538         default:
539                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
540         }
541
542         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
543                                vlan_setup);
544
545         if (new_dev == NULL)
546                 return -ENOBUFS;
547
548         /* need 4 bytes for extra VLAN header info,
549          * hope the underlying device can handle it.
550          */
551         new_dev->mtu = real_dev->mtu;
552
553 #ifdef VLAN_DEBUG
554         printk(VLAN_DBG "Allocated new name -:%s:-\n", new_dev->name);
555         VLAN_MEM_DBG("new_dev->priv malloc, addr: %p  size: %i\n",
556                      new_dev->priv,
557                      sizeof(struct vlan_dev_info));
558 #endif
559
560         VLAN_DEV_INFO(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
561         VLAN_DEV_INFO(new_dev)->real_dev = real_dev;
562         VLAN_DEV_INFO(new_dev)->dent = NULL;
563         VLAN_DEV_INFO(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
564
565         new_dev->rtnl_link_ops = &vlan_link_ops;
566         err = register_vlan_dev(new_dev);
567         if (err < 0)
568                 goto out_free_newdev;
569
570 #ifdef VLAN_DEBUG
571         printk(VLAN_DBG "Allocated new device successfully, returning.\n");
572 #endif
573         return 0;
574
575 out_free_newdev:
576         free_netdev(new_dev);
577         return err;
578 }
579
580 static void vlan_sync_address(struct net_device *dev,
581                               struct net_device *vlandev)
582 {
583         struct vlan_dev_info *vlan = VLAN_DEV_INFO(vlandev);
584
585         /* May be called without an actual change */
586         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
587                 return;
588
589         /* vlan address was different from the old address and is equal to
590          * the new address */
591         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
592             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
593                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
594
595         /* vlan address was equal to the old address and is different from
596          * the new address */
597         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
598             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
599                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
600
601         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
602 }
603
604 static int vlan_device_event(struct notifier_block *unused, unsigned long event, void *ptr)
605 {
606         struct net_device *dev = ptr;
607         struct vlan_group *grp = __vlan_find_group(dev->ifindex);
608         int i, flgs;
609         struct net_device *vlandev;
610
611         if (dev->nd_net != &init_net)
612                 return NOTIFY_DONE;
613
614         if (!grp)
615                 goto out;
616
617         /* It is OK that we do not hold the group lock right now,
618          * as we run under the RTNL lock.
619          */
620
621         switch (event) {
622         case NETDEV_CHANGE:
623                 /* Propagate real device state to vlan devices */
624                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
625                         vlandev = vlan_group_get_device(grp, i);
626                         if (!vlandev)
627                                 continue;
628
629                         vlan_transfer_operstate(dev, vlandev);
630                 }
631                 break;
632
633         case NETDEV_CHANGEADDR:
634                 /* Adjust unicast filters on underlying device */
635                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
636                         vlandev = vlan_group_get_device(grp, i);
637                         if (!vlandev)
638                                 continue;
639
640                         flgs = vlandev->flags;
641                         if (!(flgs & IFF_UP))
642                                 continue;
643
644                         vlan_sync_address(dev, vlandev);
645                 }
646                 break;
647
648         case NETDEV_DOWN:
649                 /* Put all VLANs for this dev in the down state too.  */
650                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
651                         vlandev = vlan_group_get_device(grp, i);
652                         if (!vlandev)
653                                 continue;
654
655                         flgs = vlandev->flags;
656                         if (!(flgs & IFF_UP))
657                                 continue;
658
659                         dev_change_flags(vlandev, flgs & ~IFF_UP);
660                 }
661                 break;
662
663         case NETDEV_UP:
664                 /* Put all VLANs for this dev in the up state too.  */
665                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
666                         vlandev = vlan_group_get_device(grp, i);
667                         if (!vlandev)
668                                 continue;
669
670                         flgs = vlandev->flags;
671                         if (flgs & IFF_UP)
672                                 continue;
673
674                         dev_change_flags(vlandev, flgs | IFF_UP);
675                 }
676                 break;
677
678         case NETDEV_UNREGISTER:
679                 /* Delete all VLANs for this dev. */
680                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
681                         int ret;
682
683                         vlandev = vlan_group_get_device(grp, i);
684                         if (!vlandev)
685                                 continue;
686
687                         ret = unregister_vlan_dev(dev,
688                                                   VLAN_DEV_INFO(vlandev)->vlan_id);
689
690                         unregister_netdevice(vlandev);
691
692                         /* Group was destroyed? */
693                         if (ret == 1)
694                                 break;
695                 }
696                 break;
697         }
698
699 out:
700         return NOTIFY_DONE;
701 }
702
703 /*
704  *      VLAN IOCTL handler.
705  *      o execute requested action or pass command to the device driver
706  *   arg is really a struct vlan_ioctl_args __user *.
707  */
708 static int vlan_ioctl_handler(struct net *net, void __user *arg)
709 {
710         int err;
711         unsigned short vid = 0;
712         struct vlan_ioctl_args args;
713         struct net_device *dev = NULL;
714
715         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
716                 return -EFAULT;
717
718         /* Null terminate this sucker, just in case. */
719         args.device1[23] = 0;
720         args.u.device2[23] = 0;
721
722 #ifdef VLAN_DEBUG
723         printk(VLAN_DBG "%s: args.cmd: %x\n", __FUNCTION__, args.cmd);
724 #endif
725
726         rtnl_lock();
727
728         switch (args.cmd) {
729         case SET_VLAN_INGRESS_PRIORITY_CMD:
730         case SET_VLAN_EGRESS_PRIORITY_CMD:
731         case SET_VLAN_FLAG_CMD:
732         case ADD_VLAN_CMD:
733         case DEL_VLAN_CMD:
734         case GET_VLAN_REALDEV_NAME_CMD:
735         case GET_VLAN_VID_CMD:
736                 err = -ENODEV;
737                 dev = __dev_get_by_name(&init_net, args.device1);
738                 if (!dev)
739                         goto out;
740
741                 err = -EINVAL;
742                 if (args.cmd != ADD_VLAN_CMD &&
743                     !(dev->priv_flags & IFF_802_1Q_VLAN))
744                         goto out;
745         }
746
747         switch (args.cmd) {
748         case SET_VLAN_INGRESS_PRIORITY_CMD:
749                 err = -EPERM;
750                 if (!capable(CAP_NET_ADMIN))
751                         break;
752                 vlan_dev_set_ingress_priority(dev,
753                                               args.u.skb_priority,
754                                               args.vlan_qos);
755                 err = 0;
756                 break;
757
758         case SET_VLAN_EGRESS_PRIORITY_CMD:
759                 err = -EPERM;
760                 if (!capable(CAP_NET_ADMIN))
761                         break;
762                 err = vlan_dev_set_egress_priority(dev,
763                                                    args.u.skb_priority,
764                                                    args.vlan_qos);
765                 break;
766
767         case SET_VLAN_FLAG_CMD:
768                 err = -EPERM;
769                 if (!capable(CAP_NET_ADMIN))
770                         break;
771                 err = vlan_dev_set_vlan_flag(dev,
772                                              args.u.flag,
773                                              args.vlan_qos);
774                 break;
775
776         case SET_VLAN_NAME_TYPE_CMD:
777                 err = -EPERM;
778                 if (!capable(CAP_NET_ADMIN))
779                         return -EPERM;
780                 if ((args.u.name_type >= 0) &&
781                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
782                         vlan_name_type = args.u.name_type;
783                         err = 0;
784                 } else {
785                         err = -EINVAL;
786                 }
787                 break;
788
789         case ADD_VLAN_CMD:
790                 err = -EPERM;
791                 if (!capable(CAP_NET_ADMIN))
792                         break;
793                 err = register_vlan_device(dev, args.u.VID);
794                 break;
795
796         case DEL_VLAN_CMD:
797                 err = -EPERM;
798                 if (!capable(CAP_NET_ADMIN))
799                         break;
800                 err = unregister_vlan_device(dev);
801                 break;
802
803         case GET_VLAN_INGRESS_PRIORITY_CMD:
804                 /* TODO:  Implement
805                    err = vlan_dev_get_ingress_priority(args);
806                    if (copy_to_user((void*)arg, &args,
807                         sizeof(struct vlan_ioctl_args))) {
808                         err = -EFAULT;
809                    }
810                 */
811                 err = -EINVAL;
812                 break;
813         case GET_VLAN_EGRESS_PRIORITY_CMD:
814                 /* TODO:  Implement
815                    err = vlan_dev_get_egress_priority(args.device1, &(args.args);
816                    if (copy_to_user((void*)arg, &args,
817                         sizeof(struct vlan_ioctl_args))) {
818                         err = -EFAULT;
819                    }
820                 */
821                 err = -EINVAL;
822                 break;
823         case GET_VLAN_REALDEV_NAME_CMD:
824                 err = 0;
825                 vlan_dev_get_realdev_name(dev, args.u.device2);
826                 if (copy_to_user(arg, &args,
827                                  sizeof(struct vlan_ioctl_args))) {
828                         err = -EFAULT;
829                 }
830                 break;
831
832         case GET_VLAN_VID_CMD:
833                 err = 0;
834                 vlan_dev_get_vid(dev, &vid);
835                 args.u.VID = vid;
836                 if (copy_to_user(arg, &args,
837                                  sizeof(struct vlan_ioctl_args))) {
838                       err = -EFAULT;
839                 }
840                 break;
841
842         default:
843                 /* pass on to underlying device instead?? */
844                 printk(VLAN_DBG "%s: Unknown VLAN CMD: %x \n",
845                         __FUNCTION__, args.cmd);
846                 err = -EINVAL;
847                 break;
848         }
849 out:
850         rtnl_unlock();
851         return err;
852 }
853
854 MODULE_LICENSE("GPL");
855 MODULE_VERSION(DRV_VERSION);