Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[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: netdev@vger.kernel.org
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 <linux/capability.h>
22 #include <linux/module.h>
23 #include <linux/netdevice.h>
24 #include <linux/skbuff.h>
25 #include <linux/slab.h>
26 #include <linux/init.h>
27 #include <linux/rculist.h>
28 #include <net/p8022.h>
29 #include <net/arp.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/notifier.h>
32 #include <net/rtnetlink.h>
33 #include <net/net_namespace.h>
34 #include <net/netns/generic.h>
35 #include <asm/uaccess.h>
36
37 #include <linux/if_vlan.h>
38 #include "vlan.h"
39 #include "vlanproc.h"
40
41 #define DRV_VERSION "1.8"
42
43 /* Global VLAN variables */
44
45 int vlan_net_id __read_mostly;
46
47 /* Our listing of VLAN group(s) */
48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
49
50 const char vlan_fullname[] = "802.1Q VLAN Support";
51 const char vlan_version[] = DRV_VERSION;
52 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
53 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
54
55 static struct packet_type vlan_packet_type __read_mostly = {
56         .type = cpu_to_be16(ETH_P_8021Q),
57         .func = vlan_skb_recv, /* VLAN receive method */
58 };
59
60 /* End of global variables definitions. */
61
62 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
63 {
64         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
65 }
66
67 /* Must be invoked with RCU read lock (no preempt) */
68 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
69 {
70         struct vlan_group *grp;
71         struct hlist_node *n;
72         int hash = vlan_grp_hashfn(real_dev->ifindex);
73
74         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
75                 if (grp->real_dev == real_dev)
76                         return grp;
77         }
78
79         return NULL;
80 }
81
82 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
83  *
84  * Must be invoked with RCU read lock (no preempt)
85  */
86 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
87 {
88         struct vlan_group *grp = __vlan_find_group(real_dev);
89
90         if (grp)
91                 return vlan_group_get_device(grp, vlan_id);
92
93         return NULL;
94 }
95
96 static void vlan_group_free(struct vlan_group *grp)
97 {
98         int i;
99
100         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
101                 kfree(grp->vlan_devices_arrays[i]);
102         kfree(grp);
103 }
104
105 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
106 {
107         struct vlan_group *grp;
108
109         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
110         if (!grp)
111                 return NULL;
112
113         grp->real_dev = real_dev;
114         hlist_add_head_rcu(&grp->hlist,
115                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
116         return grp;
117 }
118
119 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
120 {
121         struct net_device **array;
122         unsigned int size;
123
124         ASSERT_RTNL();
125
126         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
127         if (array != NULL)
128                 return 0;
129
130         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
131         array = kzalloc(size, GFP_KERNEL);
132         if (array == NULL)
133                 return -ENOBUFS;
134
135         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
136         return 0;
137 }
138
139 static void vlan_rcu_free(struct rcu_head *rcu)
140 {
141         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
142 }
143
144 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
145 {
146         struct vlan_dev_info *vlan = vlan_dev_info(dev);
147         struct net_device *real_dev = vlan->real_dev;
148         const struct net_device_ops *ops = real_dev->netdev_ops;
149         struct vlan_group *grp;
150         u16 vlan_id = vlan->vlan_id;
151
152         ASSERT_RTNL();
153
154         grp = __vlan_find_group(real_dev);
155         BUG_ON(!grp);
156
157         /* Take it out of our own structures, but be sure to interlock with
158          * HW accelerating devices or SW vlan input packet processing if
159          * VLAN is not 0 (leave it there for 802.1p).
160          */
161         if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
162                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
163
164         grp->nr_vlans--;
165
166         vlan_group_set_device(grp, vlan_id, NULL);
167         if (!grp->killall)
168                 synchronize_net();
169
170         unregister_netdevice_queue(dev, head);
171
172         /* If the group is now empty, kill off the group. */
173         if (grp->nr_vlans == 0) {
174                 vlan_gvrp_uninit_applicant(real_dev);
175
176                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
177                         ops->ndo_vlan_rx_register(real_dev, NULL);
178
179                 hlist_del_rcu(&grp->hlist);
180
181                 /* Free the group, after all cpu's are done. */
182                 call_rcu(&grp->rcu, vlan_rcu_free);
183         }
184
185         /* Get rid of the vlan's reference to real_dev */
186         dev_put(real_dev);
187 }
188
189 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
190 {
191         const char *name = real_dev->name;
192         const struct net_device_ops *ops = real_dev->netdev_ops;
193
194         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
195                 pr_info("8021q: VLANs not supported on %s\n", name);
196                 return -EOPNOTSUPP;
197         }
198
199         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
200                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
201                 return -EOPNOTSUPP;
202         }
203
204         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
205             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
206                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
207                 return -EOPNOTSUPP;
208         }
209
210         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
211                 return -EEXIST;
212
213         return 0;
214 }
215
216 int register_vlan_dev(struct net_device *dev)
217 {
218         struct vlan_dev_info *vlan = vlan_dev_info(dev);
219         struct net_device *real_dev = vlan->real_dev;
220         const struct net_device_ops *ops = real_dev->netdev_ops;
221         u16 vlan_id = vlan->vlan_id;
222         struct vlan_group *grp, *ngrp = NULL;
223         int err;
224
225         grp = __vlan_find_group(real_dev);
226         if (!grp) {
227                 ngrp = grp = vlan_group_alloc(real_dev);
228                 if (!grp)
229                         return -ENOBUFS;
230                 err = vlan_gvrp_init_applicant(real_dev);
231                 if (err < 0)
232                         goto out_free_group;
233         }
234
235         err = vlan_group_prealloc_vid(grp, vlan_id);
236         if (err < 0)
237                 goto out_uninit_applicant;
238
239         err = register_netdevice(dev);
240         if (err < 0)
241                 goto out_uninit_applicant;
242
243         /* Account for reference in struct vlan_dev_info */
244         dev_hold(real_dev);
245
246         netif_stacked_transfer_operstate(real_dev, dev);
247         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
248
249         /* So, got the sucker initialized, now lets place
250          * it into our local structure.
251          */
252         vlan_group_set_device(grp, vlan_id, dev);
253         grp->nr_vlans++;
254
255         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
256                 ops->ndo_vlan_rx_register(real_dev, ngrp);
257         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
258                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
259
260         return 0;
261
262 out_uninit_applicant:
263         if (ngrp)
264                 vlan_gvrp_uninit_applicant(real_dev);
265 out_free_group:
266         if (ngrp) {
267                 hlist_del_rcu(&ngrp->hlist);
268                 /* Free the group, after all cpu's are done. */
269                 call_rcu(&ngrp->rcu, vlan_rcu_free);
270         }
271         return err;
272 }
273
274 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
275  *  Returns 0 if the device was created or a negative error code otherwise.
276  */
277 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
278 {
279         struct net_device *new_dev;
280         struct net *net = dev_net(real_dev);
281         struct vlan_net *vn = net_generic(net, vlan_net_id);
282         char name[IFNAMSIZ];
283         int err;
284
285         if (vlan_id >= VLAN_VID_MASK)
286                 return -ERANGE;
287
288         err = vlan_check_real_dev(real_dev, vlan_id);
289         if (err < 0)
290                 return err;
291
292         /* Gotta set up the fields for the device. */
293         switch (vn->name_type) {
294         case VLAN_NAME_TYPE_RAW_PLUS_VID:
295                 /* name will look like:  eth1.0005 */
296                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
297                 break;
298         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
299                 /* Put our vlan.VID in the name.
300                  * Name will look like:  vlan5
301                  */
302                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
303                 break;
304         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
305                 /* Put our vlan.VID in the name.
306                  * Name will look like:  eth0.5
307                  */
308                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
309                 break;
310         case VLAN_NAME_TYPE_PLUS_VID:
311                 /* Put our vlan.VID in the name.
312                  * Name will look like:  vlan0005
313                  */
314         default:
315                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
316         }
317
318         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
319                                   vlan_setup, real_dev->num_tx_queues);
320
321         if (new_dev == NULL)
322                 return -ENOBUFS;
323
324         netif_copy_real_num_queues(new_dev, real_dev);
325         dev_net_set(new_dev, net);
326         /* need 4 bytes for extra VLAN header info,
327          * hope the underlying device can handle it.
328          */
329         new_dev->mtu = real_dev->mtu;
330
331         vlan_dev_info(new_dev)->vlan_id = vlan_id;
332         vlan_dev_info(new_dev)->real_dev = real_dev;
333         vlan_dev_info(new_dev)->dent = NULL;
334         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
335
336         new_dev->rtnl_link_ops = &vlan_link_ops;
337         err = register_vlan_dev(new_dev);
338         if (err < 0)
339                 goto out_free_newdev;
340
341         return 0;
342
343 out_free_newdev:
344         free_netdev(new_dev);
345         return err;
346 }
347
348 static void vlan_sync_address(struct net_device *dev,
349                               struct net_device *vlandev)
350 {
351         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
352
353         /* May be called without an actual change */
354         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
355                 return;
356
357         /* vlan address was different from the old address and is equal to
358          * the new address */
359         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
360             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
361                 dev_uc_del(dev, vlandev->dev_addr);
362
363         /* vlan address was equal to the old address and is different from
364          * the new address */
365         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
366             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
367                 dev_uc_add(dev, vlandev->dev_addr);
368
369         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
370 }
371
372 static void vlan_transfer_features(struct net_device *dev,
373                                    struct net_device *vlandev)
374 {
375         unsigned long old_features = vlandev->features;
376
377         vlandev->features &= ~dev->vlan_features;
378         vlandev->features |= dev->features & dev->vlan_features;
379         vlandev->gso_max_size = dev->gso_max_size;
380 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
381         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
382 #endif
383         vlandev->real_num_tx_queues = dev->real_num_tx_queues;
384         BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
385
386         if (old_features != vlandev->features)
387                 netdev_features_change(vlandev);
388 }
389
390 static void __vlan_device_event(struct net_device *dev, unsigned long event)
391 {
392         switch (event) {
393         case NETDEV_CHANGENAME:
394                 vlan_proc_rem_dev(dev);
395                 if (vlan_proc_add_dev(dev) < 0)
396                         pr_warning("8021q: failed to change proc name for %s\n",
397                                         dev->name);
398                 break;
399         case NETDEV_REGISTER:
400                 if (vlan_proc_add_dev(dev) < 0)
401                         pr_warning("8021q: failed to add proc entry for %s\n",
402                                         dev->name);
403                 break;
404         case NETDEV_UNREGISTER:
405                 vlan_proc_rem_dev(dev);
406                 break;
407         }
408 }
409
410 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
411                              void *ptr)
412 {
413         struct net_device *dev = ptr;
414         struct vlan_group *grp;
415         int i, flgs;
416         struct net_device *vlandev;
417         struct vlan_dev_info *vlan;
418         LIST_HEAD(list);
419
420         if (is_vlan_dev(dev))
421                 __vlan_device_event(dev, event);
422
423         if ((event == NETDEV_UP) &&
424             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
425             dev->netdev_ops->ndo_vlan_rx_add_vid) {
426                 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
427                         dev->name);
428                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
429         }
430
431         grp = __vlan_find_group(dev);
432         if (!grp)
433                 goto out;
434
435         /* It is OK that we do not hold the group lock right now,
436          * as we run under the RTNL lock.
437          */
438
439         switch (event) {
440         case NETDEV_CHANGE:
441                 /* Propagate real device state to vlan devices */
442                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
443                         vlandev = vlan_group_get_device(grp, i);
444                         if (!vlandev)
445                                 continue;
446
447                         netif_stacked_transfer_operstate(dev, vlandev);
448                 }
449                 break;
450
451         case NETDEV_CHANGEADDR:
452                 /* Adjust unicast filters on underlying device */
453                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
454                         vlandev = vlan_group_get_device(grp, i);
455                         if (!vlandev)
456                                 continue;
457
458                         flgs = vlandev->flags;
459                         if (!(flgs & IFF_UP))
460                                 continue;
461
462                         vlan_sync_address(dev, vlandev);
463                 }
464                 break;
465
466         case NETDEV_CHANGEMTU:
467                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
468                         vlandev = vlan_group_get_device(grp, i);
469                         if (!vlandev)
470                                 continue;
471
472                         if (vlandev->mtu <= dev->mtu)
473                                 continue;
474
475                         dev_set_mtu(vlandev, dev->mtu);
476                 }
477                 break;
478
479         case NETDEV_FEAT_CHANGE:
480                 /* Propagate device features to underlying device */
481                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
482                         vlandev = vlan_group_get_device(grp, i);
483                         if (!vlandev)
484                                 continue;
485
486                         vlan_transfer_features(dev, vlandev);
487                 }
488
489                 break;
490
491         case NETDEV_DOWN:
492                 /* Put all VLANs for this dev in the down state too.  */
493                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
494                         vlandev = vlan_group_get_device(grp, i);
495                         if (!vlandev)
496                                 continue;
497
498                         flgs = vlandev->flags;
499                         if (!(flgs & IFF_UP))
500                                 continue;
501
502                         vlan = vlan_dev_info(vlandev);
503                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
504                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
505                         netif_stacked_transfer_operstate(dev, vlandev);
506                 }
507                 break;
508
509         case NETDEV_UP:
510                 /* Put all VLANs for this dev in the up state too.  */
511                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
512                         vlandev = vlan_group_get_device(grp, i);
513                         if (!vlandev)
514                                 continue;
515
516                         flgs = vlandev->flags;
517                         if (flgs & IFF_UP)
518                                 continue;
519
520                         vlan = vlan_dev_info(vlandev);
521                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
522                                 dev_change_flags(vlandev, flgs | IFF_UP);
523                         netif_stacked_transfer_operstate(dev, vlandev);
524                 }
525                 break;
526
527         case NETDEV_UNREGISTER:
528                 /* twiddle thumbs on netns device moves */
529                 if (dev->reg_state != NETREG_UNREGISTERING)
530                         break;
531
532                 /* Delete all VLANs for this dev. */
533                 grp->killall = 1;
534
535                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
536                         vlandev = vlan_group_get_device(grp, i);
537                         if (!vlandev)
538                                 continue;
539
540                         /* unregistration of last vlan destroys group, abort
541                          * afterwards */
542                         if (grp->nr_vlans == 1)
543                                 i = VLAN_GROUP_ARRAY_LEN;
544
545                         unregister_vlan_dev(vlandev, &list);
546                 }
547                 unregister_netdevice_many(&list);
548                 break;
549
550         case NETDEV_PRE_TYPE_CHANGE:
551                 /* Forbid underlaying device to change its type. */
552                 return NOTIFY_BAD;
553         }
554
555 out:
556         return NOTIFY_DONE;
557 }
558
559 static struct notifier_block vlan_notifier_block __read_mostly = {
560         .notifier_call = vlan_device_event,
561 };
562
563 /*
564  *      VLAN IOCTL handler.
565  *      o execute requested action or pass command to the device driver
566  *   arg is really a struct vlan_ioctl_args __user *.
567  */
568 static int vlan_ioctl_handler(struct net *net, void __user *arg)
569 {
570         int err;
571         struct vlan_ioctl_args args;
572         struct net_device *dev = NULL;
573
574         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
575                 return -EFAULT;
576
577         /* Null terminate this sucker, just in case. */
578         args.device1[23] = 0;
579         args.u.device2[23] = 0;
580
581         rtnl_lock();
582
583         switch (args.cmd) {
584         case SET_VLAN_INGRESS_PRIORITY_CMD:
585         case SET_VLAN_EGRESS_PRIORITY_CMD:
586         case SET_VLAN_FLAG_CMD:
587         case ADD_VLAN_CMD:
588         case DEL_VLAN_CMD:
589         case GET_VLAN_REALDEV_NAME_CMD:
590         case GET_VLAN_VID_CMD:
591                 err = -ENODEV;
592                 dev = __dev_get_by_name(net, args.device1);
593                 if (!dev)
594                         goto out;
595
596                 err = -EINVAL;
597                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
598                         goto out;
599         }
600
601         switch (args.cmd) {
602         case SET_VLAN_INGRESS_PRIORITY_CMD:
603                 err = -EPERM;
604                 if (!capable(CAP_NET_ADMIN))
605                         break;
606                 vlan_dev_set_ingress_priority(dev,
607                                               args.u.skb_priority,
608                                               args.vlan_qos);
609                 err = 0;
610                 break;
611
612         case SET_VLAN_EGRESS_PRIORITY_CMD:
613                 err = -EPERM;
614                 if (!capable(CAP_NET_ADMIN))
615                         break;
616                 err = vlan_dev_set_egress_priority(dev,
617                                                    args.u.skb_priority,
618                                                    args.vlan_qos);
619                 break;
620
621         case SET_VLAN_FLAG_CMD:
622                 err = -EPERM;
623                 if (!capable(CAP_NET_ADMIN))
624                         break;
625                 err = vlan_dev_change_flags(dev,
626                                             args.vlan_qos ? args.u.flag : 0,
627                                             args.u.flag);
628                 break;
629
630         case SET_VLAN_NAME_TYPE_CMD:
631                 err = -EPERM;
632                 if (!capable(CAP_NET_ADMIN))
633                         break;
634                 if ((args.u.name_type >= 0) &&
635                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
636                         struct vlan_net *vn;
637
638                         vn = net_generic(net, vlan_net_id);
639                         vn->name_type = args.u.name_type;
640                         err = 0;
641                 } else {
642                         err = -EINVAL;
643                 }
644                 break;
645
646         case ADD_VLAN_CMD:
647                 err = -EPERM;
648                 if (!capable(CAP_NET_ADMIN))
649                         break;
650                 err = register_vlan_device(dev, args.u.VID);
651                 break;
652
653         case DEL_VLAN_CMD:
654                 err = -EPERM;
655                 if (!capable(CAP_NET_ADMIN))
656                         break;
657                 unregister_vlan_dev(dev, NULL);
658                 err = 0;
659                 break;
660
661         case GET_VLAN_REALDEV_NAME_CMD:
662                 err = 0;
663                 vlan_dev_get_realdev_name(dev, args.u.device2);
664                 if (copy_to_user(arg, &args,
665                                  sizeof(struct vlan_ioctl_args)))
666                         err = -EFAULT;
667                 break;
668
669         case GET_VLAN_VID_CMD:
670                 err = 0;
671                 args.u.VID = vlan_dev_vlan_id(dev);
672                 if (copy_to_user(arg, &args,
673                                  sizeof(struct vlan_ioctl_args)))
674                       err = -EFAULT;
675                 break;
676
677         default:
678                 err = -EOPNOTSUPP;
679                 break;
680         }
681 out:
682         rtnl_unlock();
683         return err;
684 }
685
686 static int __net_init vlan_init_net(struct net *net)
687 {
688         struct vlan_net *vn = net_generic(net, vlan_net_id);
689         int err;
690
691         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
692
693         err = vlan_proc_init(net);
694
695         return err;
696 }
697
698 static void __net_exit vlan_exit_net(struct net *net)
699 {
700         vlan_proc_cleanup(net);
701 }
702
703 static struct pernet_operations vlan_net_ops = {
704         .init = vlan_init_net,
705         .exit = vlan_exit_net,
706         .id   = &vlan_net_id,
707         .size = sizeof(struct vlan_net),
708 };
709
710 static int __init vlan_proto_init(void)
711 {
712         int err;
713
714         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
715         pr_info("All bugs added by %s\n", vlan_buggyright);
716
717         err = register_pernet_subsys(&vlan_net_ops);
718         if (err < 0)
719                 goto err0;
720
721         err = register_netdevice_notifier(&vlan_notifier_block);
722         if (err < 0)
723                 goto err2;
724
725         err = vlan_gvrp_init();
726         if (err < 0)
727                 goto err3;
728
729         err = vlan_netlink_init();
730         if (err < 0)
731                 goto err4;
732
733         dev_add_pack(&vlan_packet_type);
734         vlan_ioctl_set(vlan_ioctl_handler);
735         return 0;
736
737 err4:
738         vlan_gvrp_uninit();
739 err3:
740         unregister_netdevice_notifier(&vlan_notifier_block);
741 err2:
742         unregister_pernet_subsys(&vlan_net_ops);
743 err0:
744         return err;
745 }
746
747 static void __exit vlan_cleanup_module(void)
748 {
749         unsigned int i;
750
751         vlan_ioctl_set(NULL);
752         vlan_netlink_fini();
753
754         unregister_netdevice_notifier(&vlan_notifier_block);
755
756         dev_remove_pack(&vlan_packet_type);
757
758         /* This table must be empty if there are no module references left. */
759         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
760                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
761
762         unregister_pernet_subsys(&vlan_net_ops);
763         rcu_barrier(); /* Wait for completion of call_rcu()'s */
764
765         vlan_gvrp_uninit();
766 }
767
768 module_init(vlan_proto_init);
769 module_exit(vlan_cleanup_module);
770
771 MODULE_LICENSE("GPL");
772 MODULE_VERSION(DRV_VERSION);