e47600b4e2e360d0ed59b0d1e1866bcdbd3da5cc
[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         vlan_group_set_device(grp, vlan_id, NULL);
128         if (!grp->killall)
129                 synchronize_net();
130
131         unregister_netdevice_queue(dev, head);
132
133         /* If the group is now empty, kill off the group. */
134         if (grp->nr_vlans == 0) {
135                 vlan_gvrp_uninit_applicant(real_dev);
136
137                 rcu_assign_pointer(real_dev->vlgrp, NULL);
138                 if (ops->ndo_vlan_rx_register)
139                         ops->ndo_vlan_rx_register(real_dev, NULL);
140
141                 /* Free the group, after all cpu's are done. */
142                 call_rcu(&grp->rcu, vlan_rcu_free);
143         }
144
145         /* Get rid of the vlan's reference to real_dev */
146         dev_put(real_dev);
147 }
148
149 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
150 {
151         const char *name = real_dev->name;
152         const struct net_device_ops *ops = real_dev->netdev_ops;
153
154         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
155                 pr_info("8021q: VLANs not supported on %s\n", name);
156                 return -EOPNOTSUPP;
157         }
158
159         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
160             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
161                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
162                 return -EOPNOTSUPP;
163         }
164
165         if (vlan_find_dev(real_dev, vlan_id) != NULL)
166                 return -EEXIST;
167
168         return 0;
169 }
170
171 int register_vlan_dev(struct net_device *dev)
172 {
173         struct vlan_dev_info *vlan = vlan_dev_info(dev);
174         struct net_device *real_dev = vlan->real_dev;
175         const struct net_device_ops *ops = real_dev->netdev_ops;
176         u16 vlan_id = vlan->vlan_id;
177         struct vlan_group *grp, *ngrp = NULL;
178         int err;
179
180         grp = rtnl_dereference(real_dev->vlgrp);
181         if (!grp) {
182                 ngrp = grp = vlan_group_alloc(real_dev);
183                 if (!grp)
184                         return -ENOBUFS;
185                 err = vlan_gvrp_init_applicant(real_dev);
186                 if (err < 0)
187                         goto out_free_group;
188         }
189
190         err = vlan_group_prealloc_vid(grp, vlan_id);
191         if (err < 0)
192                 goto out_uninit_applicant;
193
194         err = register_netdevice(dev);
195         if (err < 0)
196                 goto out_uninit_applicant;
197
198         /* Account for reference in struct vlan_dev_info */
199         dev_hold(real_dev);
200
201         netif_stacked_transfer_operstate(real_dev, dev);
202         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
203
204         /* So, got the sucker initialized, now lets place
205          * it into our local structure.
206          */
207         vlan_group_set_device(grp, vlan_id, dev);
208         grp->nr_vlans++;
209
210         if (ngrp) {
211                 if (ops->ndo_vlan_rx_register)
212                         ops->ndo_vlan_rx_register(real_dev, ngrp);
213                 rcu_assign_pointer(real_dev->vlgrp, ngrp);
214         }
215         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
216                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
217
218         return 0;
219
220 out_uninit_applicant:
221         if (ngrp)
222                 vlan_gvrp_uninit_applicant(real_dev);
223 out_free_group:
224         if (ngrp) {
225                 /* Free the group, after all cpu's are done. */
226                 call_rcu(&ngrp->rcu, vlan_rcu_free);
227         }
228         return err;
229 }
230
231 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
232  *  Returns 0 if the device was created or a negative error code otherwise.
233  */
234 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
235 {
236         struct net_device *new_dev;
237         struct net *net = dev_net(real_dev);
238         struct vlan_net *vn = net_generic(net, vlan_net_id);
239         char name[IFNAMSIZ];
240         int err;
241
242         if (vlan_id >= VLAN_VID_MASK)
243                 return -ERANGE;
244
245         err = vlan_check_real_dev(real_dev, vlan_id);
246         if (err < 0)
247                 return err;
248
249         /* Gotta set up the fields for the device. */
250         switch (vn->name_type) {
251         case VLAN_NAME_TYPE_RAW_PLUS_VID:
252                 /* name will look like:  eth1.0005 */
253                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
254                 break;
255         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
256                 /* Put our vlan.VID in the name.
257                  * Name will look like:  vlan5
258                  */
259                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
260                 break;
261         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
262                 /* Put our vlan.VID in the name.
263                  * Name will look like:  eth0.5
264                  */
265                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
266                 break;
267         case VLAN_NAME_TYPE_PLUS_VID:
268                 /* Put our vlan.VID in the name.
269                  * Name will look like:  vlan0005
270                  */
271         default:
272                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
273         }
274
275         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
276
277         if (new_dev == NULL)
278                 return -ENOBUFS;
279
280         dev_net_set(new_dev, net);
281         /* need 4 bytes for extra VLAN header info,
282          * hope the underlying device can handle it.
283          */
284         new_dev->mtu = real_dev->mtu;
285
286         vlan_dev_info(new_dev)->vlan_id = vlan_id;
287         vlan_dev_info(new_dev)->real_dev = real_dev;
288         vlan_dev_info(new_dev)->dent = NULL;
289         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
290
291         new_dev->rtnl_link_ops = &vlan_link_ops;
292         err = register_vlan_dev(new_dev);
293         if (err < 0)
294                 goto out_free_newdev;
295
296         return 0;
297
298 out_free_newdev:
299         free_netdev(new_dev);
300         return err;
301 }
302
303 static void vlan_sync_address(struct net_device *dev,
304                               struct net_device *vlandev)
305 {
306         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
307
308         /* May be called without an actual change */
309         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
310                 return;
311
312         /* vlan address was different from the old address and is equal to
313          * the new address */
314         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
315             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
316                 dev_uc_del(dev, vlandev->dev_addr);
317
318         /* vlan address was equal to the old address and is different from
319          * the new address */
320         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
321             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
322                 dev_uc_add(dev, vlandev->dev_addr);
323
324         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
325 }
326
327 static void vlan_transfer_features(struct net_device *dev,
328                                    struct net_device *vlandev)
329 {
330         vlandev->gso_max_size = dev->gso_max_size;
331
332         if (dev->features & NETIF_F_HW_VLAN_TX)
333                 vlandev->hard_header_len = dev->hard_header_len;
334         else
335                 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
336
337 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
338         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
339 #endif
340
341         netdev_update_features(vlandev);
342 }
343
344 static void __vlan_device_event(struct net_device *dev, unsigned long event)
345 {
346         switch (event) {
347         case NETDEV_CHANGENAME:
348                 vlan_proc_rem_dev(dev);
349                 if (vlan_proc_add_dev(dev) < 0)
350                         pr_warning("8021q: failed to change proc name for %s\n",
351                                         dev->name);
352                 break;
353         case NETDEV_REGISTER:
354                 if (vlan_proc_add_dev(dev) < 0)
355                         pr_warning("8021q: failed to add proc entry for %s\n",
356                                         dev->name);
357                 break;
358         case NETDEV_UNREGISTER:
359                 vlan_proc_rem_dev(dev);
360                 break;
361         }
362 }
363
364 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
365                              void *ptr)
366 {
367         struct net_device *dev = ptr;
368         struct vlan_group *grp;
369         int i, flgs;
370         struct net_device *vlandev;
371         struct vlan_dev_info *vlan;
372         LIST_HEAD(list);
373
374         if (is_vlan_dev(dev))
375                 __vlan_device_event(dev, event);
376
377         if ((event == NETDEV_UP) &&
378             (dev->features & NETIF_F_HW_VLAN_FILTER) &&
379             dev->netdev_ops->ndo_vlan_rx_add_vid) {
380                 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
381                         dev->name);
382                 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
383         }
384
385         grp = rtnl_dereference(dev->vlgrp);
386         if (!grp)
387                 goto out;
388
389         /* It is OK that we do not hold the group lock right now,
390          * as we run under the RTNL lock.
391          */
392
393         switch (event) {
394         case NETDEV_CHANGE:
395                 /* Propagate real device state to vlan devices */
396                 for (i = 0; i < VLAN_N_VID; i++) {
397                         vlandev = vlan_group_get_device(grp, i);
398                         if (!vlandev)
399                                 continue;
400
401                         netif_stacked_transfer_operstate(dev, vlandev);
402                 }
403                 break;
404
405         case NETDEV_CHANGEADDR:
406                 /* Adjust unicast filters on underlying device */
407                 for (i = 0; i < VLAN_N_VID; i++) {
408                         vlandev = vlan_group_get_device(grp, i);
409                         if (!vlandev)
410                                 continue;
411
412                         flgs = vlandev->flags;
413                         if (!(flgs & IFF_UP))
414                                 continue;
415
416                         vlan_sync_address(dev, vlandev);
417                 }
418                 break;
419
420         case NETDEV_CHANGEMTU:
421                 for (i = 0; i < VLAN_N_VID; i++) {
422                         vlandev = vlan_group_get_device(grp, i);
423                         if (!vlandev)
424                                 continue;
425
426                         if (vlandev->mtu <= dev->mtu)
427                                 continue;
428
429                         dev_set_mtu(vlandev, dev->mtu);
430                 }
431                 break;
432
433         case NETDEV_FEAT_CHANGE:
434                 /* Propagate device features to underlying device */
435                 for (i = 0; i < VLAN_N_VID; i++) {
436                         vlandev = vlan_group_get_device(grp, i);
437                         if (!vlandev)
438                                 continue;
439
440                         vlan_transfer_features(dev, vlandev);
441                 }
442
443                 break;
444
445         case NETDEV_DOWN:
446                 /* Put all VLANs for this dev in the down state too.  */
447                 for (i = 0; i < VLAN_N_VID; i++) {
448                         vlandev = vlan_group_get_device(grp, i);
449                         if (!vlandev)
450                                 continue;
451
452                         flgs = vlandev->flags;
453                         if (!(flgs & IFF_UP))
454                                 continue;
455
456                         vlan = vlan_dev_info(vlandev);
457                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
458                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
459                         netif_stacked_transfer_operstate(dev, vlandev);
460                 }
461                 break;
462
463         case NETDEV_UP:
464                 /* Put all VLANs for this dev in the up state too.  */
465                 for (i = 0; i < VLAN_N_VID; i++) {
466                         vlandev = vlan_group_get_device(grp, i);
467                         if (!vlandev)
468                                 continue;
469
470                         flgs = vlandev->flags;
471                         if (flgs & IFF_UP)
472                                 continue;
473
474                         vlan = vlan_dev_info(vlandev);
475                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
476                                 dev_change_flags(vlandev, flgs | IFF_UP);
477                         netif_stacked_transfer_operstate(dev, vlandev);
478                 }
479                 break;
480
481         case NETDEV_UNREGISTER:
482                 /* twiddle thumbs on netns device moves */
483                 if (dev->reg_state != NETREG_UNREGISTERING)
484                         break;
485
486                 /* Delete all VLANs for this dev. */
487                 grp->killall = 1;
488
489                 for (i = 0; i < VLAN_N_VID; i++) {
490                         vlandev = vlan_group_get_device(grp, i);
491                         if (!vlandev)
492                                 continue;
493
494                         /* unregistration of last vlan destroys group, abort
495                          * afterwards */
496                         if (grp->nr_vlans == 1)
497                                 i = VLAN_N_VID;
498
499                         unregister_vlan_dev(vlandev, &list);
500                 }
501                 unregister_netdevice_many(&list);
502                 break;
503
504         case NETDEV_PRE_TYPE_CHANGE:
505                 /* Forbid underlaying device to change its type. */
506                 return NOTIFY_BAD;
507         }
508
509 out:
510         return NOTIFY_DONE;
511 }
512
513 static struct notifier_block vlan_notifier_block __read_mostly = {
514         .notifier_call = vlan_device_event,
515 };
516
517 /*
518  *      VLAN IOCTL handler.
519  *      o execute requested action or pass command to the device driver
520  *   arg is really a struct vlan_ioctl_args __user *.
521  */
522 static int vlan_ioctl_handler(struct net *net, void __user *arg)
523 {
524         int err;
525         struct vlan_ioctl_args args;
526         struct net_device *dev = NULL;
527
528         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
529                 return -EFAULT;
530
531         /* Null terminate this sucker, just in case. */
532         args.device1[23] = 0;
533         args.u.device2[23] = 0;
534
535         rtnl_lock();
536
537         switch (args.cmd) {
538         case SET_VLAN_INGRESS_PRIORITY_CMD:
539         case SET_VLAN_EGRESS_PRIORITY_CMD:
540         case SET_VLAN_FLAG_CMD:
541         case ADD_VLAN_CMD:
542         case DEL_VLAN_CMD:
543         case GET_VLAN_REALDEV_NAME_CMD:
544         case GET_VLAN_VID_CMD:
545                 err = -ENODEV;
546                 dev = __dev_get_by_name(net, args.device1);
547                 if (!dev)
548                         goto out;
549
550                 err = -EINVAL;
551                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
552                         goto out;
553         }
554
555         switch (args.cmd) {
556         case SET_VLAN_INGRESS_PRIORITY_CMD:
557                 err = -EPERM;
558                 if (!capable(CAP_NET_ADMIN))
559                         break;
560                 vlan_dev_set_ingress_priority(dev,
561                                               args.u.skb_priority,
562                                               args.vlan_qos);
563                 err = 0;
564                 break;
565
566         case SET_VLAN_EGRESS_PRIORITY_CMD:
567                 err = -EPERM;
568                 if (!capable(CAP_NET_ADMIN))
569                         break;
570                 err = vlan_dev_set_egress_priority(dev,
571                                                    args.u.skb_priority,
572                                                    args.vlan_qos);
573                 break;
574
575         case SET_VLAN_FLAG_CMD:
576                 err = -EPERM;
577                 if (!capable(CAP_NET_ADMIN))
578                         break;
579                 err = vlan_dev_change_flags(dev,
580                                             args.vlan_qos ? args.u.flag : 0,
581                                             args.u.flag);
582                 break;
583
584         case SET_VLAN_NAME_TYPE_CMD:
585                 err = -EPERM;
586                 if (!capable(CAP_NET_ADMIN))
587                         break;
588                 if ((args.u.name_type >= 0) &&
589                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
590                         struct vlan_net *vn;
591
592                         vn = net_generic(net, vlan_net_id);
593                         vn->name_type = args.u.name_type;
594                         err = 0;
595                 } else {
596                         err = -EINVAL;
597                 }
598                 break;
599
600         case ADD_VLAN_CMD:
601                 err = -EPERM;
602                 if (!capable(CAP_NET_ADMIN))
603                         break;
604                 err = register_vlan_device(dev, args.u.VID);
605                 break;
606
607         case DEL_VLAN_CMD:
608                 err = -EPERM;
609                 if (!capable(CAP_NET_ADMIN))
610                         break;
611                 unregister_vlan_dev(dev, NULL);
612                 err = 0;
613                 break;
614
615         case GET_VLAN_REALDEV_NAME_CMD:
616                 err = 0;
617                 vlan_dev_get_realdev_name(dev, args.u.device2);
618                 if (copy_to_user(arg, &args,
619                                  sizeof(struct vlan_ioctl_args)))
620                         err = -EFAULT;
621                 break;
622
623         case GET_VLAN_VID_CMD:
624                 err = 0;
625                 args.u.VID = vlan_dev_vlan_id(dev);
626                 if (copy_to_user(arg, &args,
627                                  sizeof(struct vlan_ioctl_args)))
628                       err = -EFAULT;
629                 break;
630
631         default:
632                 err = -EOPNOTSUPP;
633                 break;
634         }
635 out:
636         rtnl_unlock();
637         return err;
638 }
639
640 static int __net_init vlan_init_net(struct net *net)
641 {
642         struct vlan_net *vn = net_generic(net, vlan_net_id);
643         int err;
644
645         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
646
647         err = vlan_proc_init(net);
648
649         return err;
650 }
651
652 static void __net_exit vlan_exit_net(struct net *net)
653 {
654         vlan_proc_cleanup(net);
655 }
656
657 static struct pernet_operations vlan_net_ops = {
658         .init = vlan_init_net,
659         .exit = vlan_exit_net,
660         .id   = &vlan_net_id,
661         .size = sizeof(struct vlan_net),
662 };
663
664 static int __init vlan_proto_init(void)
665 {
666         int err;
667
668         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
669         pr_info("All bugs added by %s\n", vlan_buggyright);
670
671         err = register_pernet_subsys(&vlan_net_ops);
672         if (err < 0)
673                 goto err0;
674
675         err = register_netdevice_notifier(&vlan_notifier_block);
676         if (err < 0)
677                 goto err2;
678
679         err = vlan_gvrp_init();
680         if (err < 0)
681                 goto err3;
682
683         err = vlan_netlink_init();
684         if (err < 0)
685                 goto err4;
686
687         dev_add_pack(&vlan_packet_type);
688         vlan_ioctl_set(vlan_ioctl_handler);
689         return 0;
690
691 err4:
692         vlan_gvrp_uninit();
693 err3:
694         unregister_netdevice_notifier(&vlan_notifier_block);
695 err2:
696         unregister_pernet_subsys(&vlan_net_ops);
697 err0:
698         return err;
699 }
700
701 static void __exit vlan_cleanup_module(void)
702 {
703         vlan_ioctl_set(NULL);
704         vlan_netlink_fini();
705
706         unregister_netdevice_notifier(&vlan_notifier_block);
707
708         dev_remove_pack(&vlan_packet_type);
709
710         unregister_pernet_subsys(&vlan_net_ops);
711         rcu_barrier(); /* Wait for completion of call_rcu()'s */
712
713         vlan_gvrp_uninit();
714 }
715
716 module_init(vlan_proto_init);
717 module_exit(vlan_cleanup_module);
718
719 MODULE_LICENSE("GPL");
720 MODULE_VERSION(DRV_VERSION);