Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas...
[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 const char vlan_fullname[] = "802.1Q VLAN Support";
48 const char vlan_version[] = DRV_VERSION;
49 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
50 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
51
52 static struct packet_type vlan_packet_type __read_mostly = {
53         .type = cpu_to_be16(ETH_P_8021Q),
54         .func = vlan_skb_recv, /* VLAN receive method */
55 };
56
57 /* End of global variables definitions. */
58
59 static void vlan_group_free(struct vlan_group *grp)
60 {
61         int i;
62
63         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
64                 kfree(grp->vlan_devices_arrays[i]);
65         kfree(grp);
66 }
67
68 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
69 {
70         struct vlan_group *grp;
71
72         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
73         if (!grp)
74                 return NULL;
75
76         grp->real_dev = real_dev;
77         return grp;
78 }
79
80 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
81 {
82         struct net_device **array;
83         unsigned int size;
84
85         ASSERT_RTNL();
86
87         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
88         if (array != NULL)
89                 return 0;
90
91         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
92         array = kzalloc(size, GFP_KERNEL);
93         if (array == NULL)
94                 return -ENOBUFS;
95
96         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
97         return 0;
98 }
99
100 static void vlan_rcu_free(struct rcu_head *rcu)
101 {
102         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
103 }
104
105 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
106 {
107         struct vlan_dev_info *vlan = vlan_dev_info(dev);
108         struct net_device *real_dev = vlan->real_dev;
109         const struct net_device_ops *ops = real_dev->netdev_ops;
110         struct vlan_group *grp;
111         u16 vlan_id = vlan->vlan_id;
112
113         ASSERT_RTNL();
114
115         grp = rtnl_dereference(real_dev->vlgrp);
116         BUG_ON(!grp);
117
118         /* Take it out of our own structures, but be sure to interlock with
119          * HW accelerating devices or SW vlan input packet processing if
120          * VLAN is not 0 (leave it there for 802.1p).
121          */
122         if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
123                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
124
125         grp->nr_vlans--;
126
127         if (vlan->flags & VLAN_FLAG_GVRP)
128                 vlan_gvrp_request_leave(dev);
129
130         vlan_group_set_device(grp, vlan_id, NULL);
131         if (!grp->killall)
132                 synchronize_net();
133
134         unregister_netdevice_queue(dev, head);
135
136         /* If the group is now empty, kill off the group. */
137         if (grp->nr_vlans == 0) {
138                 vlan_gvrp_uninit_applicant(real_dev);
139
140                 rcu_assign_pointer(real_dev->vlgrp, NULL);
141                 if (ops->ndo_vlan_rx_register)
142                         ops->ndo_vlan_rx_register(real_dev, NULL);
143
144                 /* Free the group, after all cpu's are done. */
145                 call_rcu(&grp->rcu, vlan_rcu_free);
146         }
147
148         /* Get rid of the vlan's reference to real_dev */
149         dev_put(real_dev);
150 }
151
152 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
153 {
154         const char *name = real_dev->name;
155         const struct net_device_ops *ops = real_dev->netdev_ops;
156
157         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
158                 pr_info("8021q: VLANs not supported on %s\n", name);
159                 return -EOPNOTSUPP;
160         }
161
162         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
163             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
164                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
165                 return -EOPNOTSUPP;
166         }
167
168         if (vlan_find_dev(real_dev, vlan_id) != NULL)
169                 return -EEXIST;
170
171         return 0;
172 }
173
174 int register_vlan_dev(struct net_device *dev)
175 {
176         struct vlan_dev_info *vlan = vlan_dev_info(dev);
177         struct net_device *real_dev = vlan->real_dev;
178         const struct net_device_ops *ops = real_dev->netdev_ops;
179         u16 vlan_id = vlan->vlan_id;
180         struct vlan_group *grp, *ngrp = NULL;
181         int err;
182
183         grp = rtnl_dereference(real_dev->vlgrp);
184         if (!grp) {
185                 ngrp = grp = vlan_group_alloc(real_dev);
186                 if (!grp)
187                         return -ENOBUFS;
188                 err = vlan_gvrp_init_applicant(real_dev);
189                 if (err < 0)
190                         goto out_free_group;
191         }
192
193         err = vlan_group_prealloc_vid(grp, vlan_id);
194         if (err < 0)
195                 goto out_uninit_applicant;
196
197         err = register_netdevice(dev);
198         if (err < 0)
199                 goto out_uninit_applicant;
200
201         /* Account for reference in struct vlan_dev_info */
202         dev_hold(real_dev);
203
204         netif_stacked_transfer_operstate(real_dev, dev);
205         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
206
207         /* So, got the sucker initialized, now lets place
208          * it into our local structure.
209          */
210         vlan_group_set_device(grp, vlan_id, dev);
211         grp->nr_vlans++;
212
213         if (ngrp) {
214                 if (ops->ndo_vlan_rx_register)
215                         ops->ndo_vlan_rx_register(real_dev, ngrp);
216                 rcu_assign_pointer(real_dev->vlgrp, ngrp);
217         }
218         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
219                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
220
221         return 0;
222
223 out_uninit_applicant:
224         if (ngrp)
225                 vlan_gvrp_uninit_applicant(real_dev);
226 out_free_group:
227         if (ngrp) {
228                 /* Free the group, after all cpu's are done. */
229                 call_rcu(&ngrp->rcu, vlan_rcu_free);
230         }
231         return err;
232 }
233
234 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
235  *  Returns 0 if the device was created or a negative error code otherwise.
236  */
237 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
238 {
239         struct net_device *new_dev;
240         struct net *net = dev_net(real_dev);
241         struct vlan_net *vn = net_generic(net, vlan_net_id);
242         char name[IFNAMSIZ];
243         int err;
244
245         if (vlan_id >= VLAN_VID_MASK)
246                 return -ERANGE;
247
248         err = vlan_check_real_dev(real_dev, vlan_id);
249         if (err < 0)
250                 return err;
251
252         /* Gotta set up the fields for the device. */
253         switch (vn->name_type) {
254         case VLAN_NAME_TYPE_RAW_PLUS_VID:
255                 /* name will look like:  eth1.0005 */
256                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
257                 break;
258         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
259                 /* Put our vlan.VID in the name.
260                  * Name will look like:  vlan5
261                  */
262                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
263                 break;
264         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
265                 /* Put our vlan.VID in the name.
266                  * Name will look like:  eth0.5
267                  */
268                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
269                 break;
270         case VLAN_NAME_TYPE_PLUS_VID:
271                 /* Put our vlan.VID in the name.
272                  * Name will look like:  vlan0005
273                  */
274         default:
275                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
276         }
277
278         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
279
280         if (new_dev == NULL)
281                 return -ENOBUFS;
282
283         dev_net_set(new_dev, net);
284         /* need 4 bytes for extra VLAN header info,
285          * hope the underlying device can handle it.
286          */
287         new_dev->mtu = real_dev->mtu;
288
289         vlan_dev_info(new_dev)->vlan_id = vlan_id;
290         vlan_dev_info(new_dev)->real_dev = real_dev;
291         vlan_dev_info(new_dev)->dent = NULL;
292         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
293
294         new_dev->rtnl_link_ops = &vlan_link_ops;
295         err = register_vlan_dev(new_dev);
296         if (err < 0)
297                 goto out_free_newdev;
298
299         return 0;
300
301 out_free_newdev:
302         free_netdev(new_dev);
303         return err;
304 }
305
306 static void vlan_sync_address(struct net_device *dev,
307                               struct net_device *vlandev)
308 {
309         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
310
311         /* May be called without an actual change */
312         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
313                 return;
314
315         /* vlan address was different from the old address and is equal to
316          * the new address */
317         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
318             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
319                 dev_uc_del(dev, vlandev->dev_addr);
320
321         /* vlan address was equal to the old address and is different from
322          * the new address */
323         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
324             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
325                 dev_uc_add(dev, vlandev->dev_addr);
326
327         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
328 }
329
330 static void vlan_transfer_features(struct net_device *dev,
331                                    struct net_device *vlandev)
332 {
333         u32 old_features = vlandev->features;
334
335         vlandev->features &= ~dev->vlan_features;
336         vlandev->features |= dev->features & dev->vlan_features;
337         vlandev->gso_max_size = dev->gso_max_size;
338
339         if (dev->features & NETIF_F_HW_VLAN_TX)
340                 vlandev->hard_header_len = dev->hard_header_len;
341         else
342                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
343
344 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
345         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
346 #endif
347         if (old_features != vlandev->features)
348                 netdev_features_change(vlandev);
349 }
350
351 static void __vlan_device_event(struct net_device *dev, unsigned long event)
352 {
353         switch (event) {
354         case NETDEV_CHANGENAME:
355                 vlan_proc_rem_dev(dev);
356                 if (vlan_proc_add_dev(dev) < 0)
357                         pr_warning("8021q: failed to change proc name for %s\n",
358                                         dev->name);
359                 break;
360         case NETDEV_REGISTER:
361                 if (vlan_proc_add_dev(dev) < 0)
362                         pr_warning("8021q: failed to add proc entry for %s\n",
363                                         dev->name);
364                 break;
365         case NETDEV_UNREGISTER:
366                 vlan_proc_rem_dev(dev);
367                 break;
368         }
369 }
370
371 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
372                              void *ptr)
373 {
374         struct net_device *dev = ptr;
375         struct vlan_group *grp;
376         int i, flgs;
377         struct net_device *vlandev;
378         struct vlan_dev_info *vlan;
379         LIST_HEAD(list);
380
381         if (is_vlan_dev(dev))
382                 __vlan_device_event(dev, event);
383
384         if ((event == NETDEV_UP) &&
385             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
386             dev->netdev_ops->ndo_vlan_rx_add_vid) {
387                 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
388                         dev->name);
389                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
390         }
391
392         grp = rtnl_dereference(dev->vlgrp);
393         if (!grp)
394                 goto out;
395
396         /* It is OK that we do not hold the group lock right now,
397          * as we run under the RTNL lock.
398          */
399
400         switch (event) {
401         case NETDEV_CHANGE:
402                 /* Propagate real device state to vlan devices */
403                 for (i = 0; i < VLAN_N_VID; i++) {
404                         vlandev = vlan_group_get_device(grp, i);
405                         if (!vlandev)
406                                 continue;
407
408                         netif_stacked_transfer_operstate(dev, vlandev);
409                 }
410                 break;
411
412         case NETDEV_CHANGEADDR:
413                 /* Adjust unicast filters on underlying device */
414                 for (i = 0; i < VLAN_N_VID; i++) {
415                         vlandev = vlan_group_get_device(grp, i);
416                         if (!vlandev)
417                                 continue;
418
419                         flgs = vlandev->flags;
420                         if (!(flgs & IFF_UP))
421                                 continue;
422
423                         vlan_sync_address(dev, vlandev);
424                 }
425                 break;
426
427         case NETDEV_CHANGEMTU:
428                 for (i = 0; i < VLAN_N_VID; i++) {
429                         vlandev = vlan_group_get_device(grp, i);
430                         if (!vlandev)
431                                 continue;
432
433                         if (vlandev->mtu <= dev->mtu)
434                                 continue;
435
436                         dev_set_mtu(vlandev, dev->mtu);
437                 }
438                 break;
439
440         case NETDEV_FEAT_CHANGE:
441                 /* Propagate device features to underlying device */
442                 for (i = 0; i < VLAN_N_VID; i++) {
443                         vlandev = vlan_group_get_device(grp, i);
444                         if (!vlandev)
445                                 continue;
446
447                         vlan_transfer_features(dev, vlandev);
448                 }
449
450                 break;
451
452         case NETDEV_DOWN:
453                 /* Put all VLANs for this dev in the down state too.  */
454                 for (i = 0; i < VLAN_N_VID; i++) {
455                         vlandev = vlan_group_get_device(grp, i);
456                         if (!vlandev)
457                                 continue;
458
459                         flgs = vlandev->flags;
460                         if (!(flgs & IFF_UP))
461                                 continue;
462
463                         vlan = vlan_dev_info(vlandev);
464                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
465                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
466                         netif_stacked_transfer_operstate(dev, vlandev);
467                 }
468                 break;
469
470         case NETDEV_UP:
471                 /* Put all VLANs for this dev in the up state too.  */
472                 for (i = 0; i < VLAN_N_VID; i++) {
473                         vlandev = vlan_group_get_device(grp, i);
474                         if (!vlandev)
475                                 continue;
476
477                         flgs = vlandev->flags;
478                         if (flgs & IFF_UP)
479                                 continue;
480
481                         vlan = vlan_dev_info(vlandev);
482                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
483                                 dev_change_flags(vlandev, flgs | IFF_UP);
484                         netif_stacked_transfer_operstate(dev, vlandev);
485                 }
486                 break;
487
488         case NETDEV_UNREGISTER:
489                 /* twiddle thumbs on netns device moves */
490                 if (dev->reg_state != NETREG_UNREGISTERING)
491                         break;
492
493                 /* Delete all VLANs for this dev. */
494                 grp->killall = 1;
495
496                 for (i = 0; i < VLAN_N_VID; i++) {
497                         vlandev = vlan_group_get_device(grp, i);
498                         if (!vlandev)
499                                 continue;
500
501                         /* unregistration of last vlan destroys group, abort
502                          * afterwards */
503                         if (grp->nr_vlans == 1)
504                                 i = VLAN_N_VID;
505
506                         unregister_vlan_dev(vlandev, &list);
507                 }
508                 unregister_netdevice_many(&list);
509                 break;
510
511         case NETDEV_PRE_TYPE_CHANGE:
512                 /* Forbid underlaying device to change its type. */
513                 return NOTIFY_BAD;
514         }
515
516 out:
517         return NOTIFY_DONE;
518 }
519
520 static struct notifier_block vlan_notifier_block __read_mostly = {
521         .notifier_call = vlan_device_event,
522 };
523
524 /*
525  *      VLAN IOCTL handler.
526  *      o execute requested action or pass command to the device driver
527  *   arg is really a struct vlan_ioctl_args __user *.
528  */
529 static int vlan_ioctl_handler(struct net *net, void __user *arg)
530 {
531         int err;
532         struct vlan_ioctl_args args;
533         struct net_device *dev = NULL;
534
535         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
536                 return -EFAULT;
537
538         /* Null terminate this sucker, just in case. */
539         args.device1[23] = 0;
540         args.u.device2[23] = 0;
541
542         rtnl_lock();
543
544         switch (args.cmd) {
545         case SET_VLAN_INGRESS_PRIORITY_CMD:
546         case SET_VLAN_EGRESS_PRIORITY_CMD:
547         case SET_VLAN_FLAG_CMD:
548         case ADD_VLAN_CMD:
549         case DEL_VLAN_CMD:
550         case GET_VLAN_REALDEV_NAME_CMD:
551         case GET_VLAN_VID_CMD:
552                 err = -ENODEV;
553                 dev = __dev_get_by_name(net, args.device1);
554                 if (!dev)
555                         goto out;
556
557                 err = -EINVAL;
558                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
559                         goto out;
560         }
561
562         switch (args.cmd) {
563         case SET_VLAN_INGRESS_PRIORITY_CMD:
564                 err = -EPERM;
565                 if (!capable(CAP_NET_ADMIN))
566                         break;
567                 vlan_dev_set_ingress_priority(dev,
568                                               args.u.skb_priority,
569                                               args.vlan_qos);
570                 err = 0;
571                 break;
572
573         case SET_VLAN_EGRESS_PRIORITY_CMD:
574                 err = -EPERM;
575                 if (!capable(CAP_NET_ADMIN))
576                         break;
577                 err = vlan_dev_set_egress_priority(dev,
578                                                    args.u.skb_priority,
579                                                    args.vlan_qos);
580                 break;
581
582         case SET_VLAN_FLAG_CMD:
583                 err = -EPERM;
584                 if (!capable(CAP_NET_ADMIN))
585                         break;
586                 err = vlan_dev_change_flags(dev,
587                                             args.vlan_qos ? args.u.flag : 0,
588                                             args.u.flag);
589                 break;
590
591         case SET_VLAN_NAME_TYPE_CMD:
592                 err = -EPERM;
593                 if (!capable(CAP_NET_ADMIN))
594                         break;
595                 if ((args.u.name_type >= 0) &&
596                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
597                         struct vlan_net *vn;
598
599                         vn = net_generic(net, vlan_net_id);
600                         vn->name_type = args.u.name_type;
601                         err = 0;
602                 } else {
603                         err = -EINVAL;
604                 }
605                 break;
606
607         case ADD_VLAN_CMD:
608                 err = -EPERM;
609                 if (!capable(CAP_NET_ADMIN))
610                         break;
611                 err = register_vlan_device(dev, args.u.VID);
612                 break;
613
614         case DEL_VLAN_CMD:
615                 err = -EPERM;
616                 if (!capable(CAP_NET_ADMIN))
617                         break;
618                 unregister_vlan_dev(dev, NULL);
619                 err = 0;
620                 break;
621
622         case GET_VLAN_REALDEV_NAME_CMD:
623                 err = 0;
624                 vlan_dev_get_realdev_name(dev, args.u.device2);
625                 if (copy_to_user(arg, &args,
626                                  sizeof(struct vlan_ioctl_args)))
627                         err = -EFAULT;
628                 break;
629
630         case GET_VLAN_VID_CMD:
631                 err = 0;
632                 args.u.VID = vlan_dev_vlan_id(dev);
633                 if (copy_to_user(arg, &args,
634                                  sizeof(struct vlan_ioctl_args)))
635                       err = -EFAULT;
636                 break;
637
638         default:
639                 err = -EOPNOTSUPP;
640                 break;
641         }
642 out:
643         rtnl_unlock();
644         return err;
645 }
646
647 static int __net_init vlan_init_net(struct net *net)
648 {
649         struct vlan_net *vn = net_generic(net, vlan_net_id);
650         int err;
651
652         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
653
654         err = vlan_proc_init(net);
655
656         return err;
657 }
658
659 static void __net_exit vlan_exit_net(struct net *net)
660 {
661         vlan_proc_cleanup(net);
662 }
663
664 static struct pernet_operations vlan_net_ops = {
665         .init = vlan_init_net,
666         .exit = vlan_exit_net,
667         .id   = &vlan_net_id,
668         .size = sizeof(struct vlan_net),
669 };
670
671 static int __init vlan_proto_init(void)
672 {
673         int err;
674
675         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
676         pr_info("All bugs added by %s\n", vlan_buggyright);
677
678         err = register_pernet_subsys(&vlan_net_ops);
679         if (err < 0)
680                 goto err0;
681
682         err = register_netdevice_notifier(&vlan_notifier_block);
683         if (err < 0)
684                 goto err2;
685
686         err = vlan_gvrp_init();
687         if (err < 0)
688                 goto err3;
689
690         err = vlan_netlink_init();
691         if (err < 0)
692                 goto err4;
693
694         dev_add_pack(&vlan_packet_type);
695         vlan_ioctl_set(vlan_ioctl_handler);
696         return 0;
697
698 err4:
699         vlan_gvrp_uninit();
700 err3:
701         unregister_netdevice_notifier(&vlan_notifier_block);
702 err2:
703         unregister_pernet_subsys(&vlan_net_ops);
704 err0:
705         return err;
706 }
707
708 static void __exit vlan_cleanup_module(void)
709 {
710         vlan_ioctl_set(NULL);
711         vlan_netlink_fini();
712
713         unregister_netdevice_notifier(&vlan_notifier_block);
714
715         dev_remove_pack(&vlan_packet_type);
716
717         unregister_pernet_subsys(&vlan_net_ops);
718         rcu_barrier(); /* Wait for completion of call_rcu()'s */
719
720         vlan_gvrp_uninit();
721 }
722
723 module_init(vlan_proto_init);
724 module_exit(vlan_cleanup_module);
725
726 MODULE_LICENSE("GPL");
727 MODULE_VERSION(DRV_VERSION);