[VLAN]: Allow vlan devices registration in net namespaces.
[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: 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 <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 #include <net/netns/generic.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;
46
47 /* Our listing of VLAN group(s) */
48 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
49
50 static char vlan_fullname[] = "802.1Q VLAN Support";
51 static char vlan_version[] = DRV_VERSION;
52 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
53 static char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
54
55 static struct packet_type vlan_packet_type = {
56         .type = __constant_htons(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,
87                                    unsigned short VID)
88 {
89         struct vlan_group *grp = __vlan_find_group(real_dev);
90
91         if (grp)
92                 return vlan_group_get_device(grp, VID);
93
94         return NULL;
95 }
96
97 static void vlan_group_free(struct vlan_group *grp)
98 {
99         int i;
100
101         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
102                 kfree(grp->vlan_devices_arrays[i]);
103         kfree(grp);
104 }
105
106 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
107 {
108         struct vlan_group *grp;
109
110         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
111         if (!grp)
112                 return NULL;
113
114         grp->real_dev = real_dev;
115         hlist_add_head_rcu(&grp->hlist,
116                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
117         return grp;
118 }
119
120 static int vlan_group_prealloc_vid(struct vlan_group *vg, int vid)
121 {
122         struct net_device **array;
123         unsigned int size;
124
125         ASSERT_RTNL();
126
127         array = vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN];
128         if (array != NULL)
129                 return 0;
130
131         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
132         array = kzalloc(size, GFP_KERNEL);
133         if (array == NULL)
134                 return -ENOBUFS;
135
136         vg->vlan_devices_arrays[vid / VLAN_GROUP_ARRAY_PART_LEN] = array;
137         return 0;
138 }
139
140 static void vlan_rcu_free(struct rcu_head *rcu)
141 {
142         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
143 }
144
145 void unregister_vlan_dev(struct net_device *dev)
146 {
147         struct vlan_dev_info *vlan = vlan_dev_info(dev);
148         struct net_device *real_dev = vlan->real_dev;
149         struct vlan_group *grp;
150         unsigned short vlan_id = vlan->vlan_id;
151
152         ASSERT_RTNL();
153
154         grp = __vlan_find_group(real_dev);
155         BUG_ON(!grp);
156
157         vlan_proc_rem_dev(dev);
158
159         /* Take it out of our own structures, but be sure to interlock with
160          * HW accelerating devices or SW vlan input packet processing.
161          */
162         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
163                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
164
165         vlan_group_set_device(grp, vlan_id, NULL);
166         grp->nr_vlans--;
167
168         synchronize_net();
169
170         /* If the group is now empty, kill off the group. */
171         if (grp->nr_vlans == 0) {
172                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
173                         real_dev->vlan_rx_register(real_dev, NULL);
174
175                 hlist_del_rcu(&grp->hlist);
176
177                 /* Free the group, after all cpu's are done. */
178                 call_rcu(&grp->rcu, vlan_rcu_free);
179         }
180
181         /* Get rid of the vlan's reference to real_dev */
182         dev_put(real_dev);
183
184         unregister_netdevice(dev);
185 }
186
187 static void vlan_transfer_operstate(const struct net_device *dev,
188                                     struct net_device *vlandev)
189 {
190         /* Have to respect userspace enforced dormant state
191          * of real device, also must allow supplicant running
192          * on VLAN device
193          */
194         if (dev->operstate == IF_OPER_DORMANT)
195                 netif_dormant_on(vlandev);
196         else
197                 netif_dormant_off(vlandev);
198
199         if (netif_carrier_ok(dev)) {
200                 if (!netif_carrier_ok(vlandev))
201                         netif_carrier_on(vlandev);
202         } else {
203                 if (netif_carrier_ok(vlandev))
204                         netif_carrier_off(vlandev);
205         }
206 }
207
208 int vlan_check_real_dev(struct net_device *real_dev, unsigned short vlan_id)
209 {
210         char *name = real_dev->name;
211
212         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
213                 pr_info("8021q: VLANs not supported on %s\n", name);
214                 return -EOPNOTSUPP;
215         }
216
217         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
218             !real_dev->vlan_rx_register) {
219                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
220                 return -EOPNOTSUPP;
221         }
222
223         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
224             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
225                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
226                 return -EOPNOTSUPP;
227         }
228
229         /* The real device must be up and operating in order to
230          * assosciate a VLAN device with it.
231          */
232         if (!(real_dev->flags & IFF_UP))
233                 return -ENETDOWN;
234
235         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
236                 return -EEXIST;
237
238         return 0;
239 }
240
241 int register_vlan_dev(struct net_device *dev)
242 {
243         struct vlan_dev_info *vlan = vlan_dev_info(dev);
244         struct net_device *real_dev = vlan->real_dev;
245         unsigned short vlan_id = vlan->vlan_id;
246         struct vlan_group *grp, *ngrp = NULL;
247         int err;
248
249         grp = __vlan_find_group(real_dev);
250         if (!grp) {
251                 ngrp = grp = vlan_group_alloc(real_dev);
252                 if (!grp)
253                         return -ENOBUFS;
254         }
255
256         err = vlan_group_prealloc_vid(grp, vlan_id);
257         if (err < 0)
258                 goto out_free_group;
259
260         err = register_netdevice(dev);
261         if (err < 0)
262                 goto out_free_group;
263
264         /* Account for reference in struct vlan_dev_info */
265         dev_hold(real_dev);
266
267         vlan_transfer_operstate(real_dev, dev);
268         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
269
270         /* So, got the sucker initialized, now lets place
271          * it into our local structure.
272          */
273         vlan_group_set_device(grp, vlan_id, dev);
274         grp->nr_vlans++;
275
276         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
277                 real_dev->vlan_rx_register(real_dev, ngrp);
278         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
279                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
280
281         if (vlan_proc_add_dev(dev) < 0)
282                 pr_warning("8021q: failed to add proc entry for %s\n",
283                            dev->name);
284         return 0;
285
286 out_free_group:
287         if (ngrp)
288                 vlan_group_free(ngrp);
289         return err;
290 }
291
292 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
293  *  Returns 0 if the device was created or a negative error code otherwise.
294  */
295 static int register_vlan_device(struct net_device *real_dev,
296                                 unsigned short VLAN_ID)
297 {
298         struct net_device *new_dev;
299         struct net *net = dev_net(real_dev);
300         struct vlan_net *vn = net_generic(net, vlan_net_id);
301         char name[IFNAMSIZ];
302         int err;
303
304         if (VLAN_ID >= VLAN_VID_MASK)
305                 return -ERANGE;
306
307         err = vlan_check_real_dev(real_dev, VLAN_ID);
308         if (err < 0)
309                 return err;
310
311         /* Gotta set up the fields for the device. */
312         switch (vn->name_type) {
313         case VLAN_NAME_TYPE_RAW_PLUS_VID:
314                 /* name will look like:  eth1.0005 */
315                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
316                 break;
317         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
318                 /* Put our vlan.VID in the name.
319                  * Name will look like:  vlan5
320                  */
321                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
322                 break;
323         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
324                 /* Put our vlan.VID in the name.
325                  * Name will look like:  eth0.5
326                  */
327                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
328                 break;
329         case VLAN_NAME_TYPE_PLUS_VID:
330                 /* Put our vlan.VID in the name.
331                  * Name will look like:  vlan0005
332                  */
333         default:
334                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
335         }
336
337         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
338                                vlan_setup);
339
340         if (new_dev == NULL)
341                 return -ENOBUFS;
342
343         dev_net_set(new_dev, net);
344         /* need 4 bytes for extra VLAN header info,
345          * hope the underlying device can handle it.
346          */
347         new_dev->mtu = real_dev->mtu;
348
349         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
350         vlan_dev_info(new_dev)->real_dev = real_dev;
351         vlan_dev_info(new_dev)->dent = NULL;
352         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
353
354         new_dev->rtnl_link_ops = &vlan_link_ops;
355         err = register_vlan_dev(new_dev);
356         if (err < 0)
357                 goto out_free_newdev;
358
359         return 0;
360
361 out_free_newdev:
362         free_netdev(new_dev);
363         return err;
364 }
365
366 static void vlan_sync_address(struct net_device *dev,
367                               struct net_device *vlandev)
368 {
369         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
370
371         /* May be called without an actual change */
372         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
373                 return;
374
375         /* vlan address was different from the old address and is equal to
376          * the new address */
377         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
378             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
379                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
380
381         /* vlan address was equal to the old address and is different from
382          * the new address */
383         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
384             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
385                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
386
387         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
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         }
400 }
401
402 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
403                              void *ptr)
404 {
405         struct net_device *dev = ptr;
406         struct vlan_group *grp;
407         int i, flgs;
408         struct net_device *vlandev;
409
410         if (is_vlan_dev(dev)) {
411                 __vlan_device_event(dev, event);
412                 goto out;
413         }
414
415         grp = __vlan_find_group(dev);
416         if (!grp)
417                 goto out;
418
419         /* It is OK that we do not hold the group lock right now,
420          * as we run under the RTNL lock.
421          */
422
423         switch (event) {
424         case NETDEV_CHANGE:
425                 /* Propagate real device state to vlan devices */
426                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
427                         vlandev = vlan_group_get_device(grp, i);
428                         if (!vlandev)
429                                 continue;
430
431                         vlan_transfer_operstate(dev, vlandev);
432                 }
433                 break;
434
435         case NETDEV_CHANGEADDR:
436                 /* Adjust unicast filters on underlying device */
437                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
438                         vlandev = vlan_group_get_device(grp, i);
439                         if (!vlandev)
440                                 continue;
441
442                         flgs = vlandev->flags;
443                         if (!(flgs & IFF_UP))
444                                 continue;
445
446                         vlan_sync_address(dev, vlandev);
447                 }
448                 break;
449
450         case NETDEV_DOWN:
451                 /* Put all VLANs for this dev in the down state too.  */
452                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
453                         vlandev = vlan_group_get_device(grp, i);
454                         if (!vlandev)
455                                 continue;
456
457                         flgs = vlandev->flags;
458                         if (!(flgs & IFF_UP))
459                                 continue;
460
461                         dev_change_flags(vlandev, flgs & ~IFF_UP);
462                 }
463                 break;
464
465         case NETDEV_UP:
466                 /* Put all VLANs for this dev in the up state too.  */
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                         flgs = vlandev->flags;
473                         if (flgs & IFF_UP)
474                                 continue;
475
476                         dev_change_flags(vlandev, flgs | IFF_UP);
477                 }
478                 break;
479
480         case NETDEV_UNREGISTER:
481                 /* Delete all VLANs for this dev. */
482                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
483                         vlandev = vlan_group_get_device(grp, i);
484                         if (!vlandev)
485                                 continue;
486
487                         /* unregistration of last vlan destroys group, abort
488                          * afterwards */
489                         if (grp->nr_vlans == 1)
490                                 i = VLAN_GROUP_ARRAY_LEN;
491
492                         unregister_vlan_dev(vlandev);
493                 }
494                 break;
495         }
496
497 out:
498         return NOTIFY_DONE;
499 }
500
501 static struct notifier_block vlan_notifier_block __read_mostly = {
502         .notifier_call = vlan_device_event,
503 };
504
505 /*
506  *      VLAN IOCTL handler.
507  *      o execute requested action or pass command to the device driver
508  *   arg is really a struct vlan_ioctl_args __user *.
509  */
510 static int vlan_ioctl_handler(struct net *net, void __user *arg)
511 {
512         int err;
513         unsigned short vid = 0;
514         struct vlan_ioctl_args args;
515         struct net_device *dev = NULL;
516
517         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
518                 return -EFAULT;
519
520         /* Null terminate this sucker, just in case. */
521         args.device1[23] = 0;
522         args.u.device2[23] = 0;
523
524         rtnl_lock();
525
526         switch (args.cmd) {
527         case SET_VLAN_INGRESS_PRIORITY_CMD:
528         case SET_VLAN_EGRESS_PRIORITY_CMD:
529         case SET_VLAN_FLAG_CMD:
530         case ADD_VLAN_CMD:
531         case DEL_VLAN_CMD:
532         case GET_VLAN_REALDEV_NAME_CMD:
533         case GET_VLAN_VID_CMD:
534                 err = -ENODEV;
535                 dev = __dev_get_by_name(net, args.device1);
536                 if (!dev)
537                         goto out;
538
539                 err = -EINVAL;
540                 if (args.cmd != ADD_VLAN_CMD &&
541                     !(dev->priv_flags & IFF_802_1Q_VLAN))
542                         goto out;
543         }
544
545         switch (args.cmd) {
546         case SET_VLAN_INGRESS_PRIORITY_CMD:
547                 err = -EPERM;
548                 if (!capable(CAP_NET_ADMIN))
549                         break;
550                 vlan_dev_set_ingress_priority(dev,
551                                               args.u.skb_priority,
552                                               args.vlan_qos);
553                 err = 0;
554                 break;
555
556         case SET_VLAN_EGRESS_PRIORITY_CMD:
557                 err = -EPERM;
558                 if (!capable(CAP_NET_ADMIN))
559                         break;
560                 err = vlan_dev_set_egress_priority(dev,
561                                                    args.u.skb_priority,
562                                                    args.vlan_qos);
563                 break;
564
565         case SET_VLAN_FLAG_CMD:
566                 err = -EPERM;
567                 if (!capable(CAP_NET_ADMIN))
568                         break;
569                 err = vlan_dev_set_vlan_flag(dev,
570                                              args.u.flag,
571                                              args.vlan_qos);
572                 break;
573
574         case SET_VLAN_NAME_TYPE_CMD:
575                 err = -EPERM;
576                 if (!capable(CAP_NET_ADMIN))
577                         break;
578                 if ((args.u.name_type >= 0) &&
579                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
580                         struct vlan_net *vn;
581
582                         vn = net_generic(net, vlan_net_id);
583                         vn->name_type = args.u.name_type;
584                         err = 0;
585                 } else {
586                         err = -EINVAL;
587                 }
588                 break;
589
590         case ADD_VLAN_CMD:
591                 err = -EPERM;
592                 if (!capable(CAP_NET_ADMIN))
593                         break;
594                 err = register_vlan_device(dev, args.u.VID);
595                 break;
596
597         case DEL_VLAN_CMD:
598                 err = -EPERM;
599                 if (!capable(CAP_NET_ADMIN))
600                         break;
601                 unregister_vlan_dev(dev);
602                 err = 0;
603                 break;
604
605         case GET_VLAN_REALDEV_NAME_CMD:
606                 err = 0;
607                 vlan_dev_get_realdev_name(dev, args.u.device2);
608                 if (copy_to_user(arg, &args,
609                                  sizeof(struct vlan_ioctl_args)))
610                         err = -EFAULT;
611                 break;
612
613         case GET_VLAN_VID_CMD:
614                 err = 0;
615                 vlan_dev_get_vid(dev, &vid);
616                 args.u.VID = vid;
617                 if (copy_to_user(arg, &args,
618                                  sizeof(struct vlan_ioctl_args)))
619                       err = -EFAULT;
620                 break;
621
622         default:
623                 err = -EOPNOTSUPP;
624                 break;
625         }
626 out:
627         rtnl_unlock();
628         return err;
629 }
630
631 static int vlan_init_net(struct net *net)
632 {
633         int err;
634         struct vlan_net *vn;
635
636         err = -ENOMEM;
637         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
638         if (vn == NULL)
639                 goto err_alloc;
640
641         err = net_assign_generic(net, vlan_net_id, vn);
642         if (err < 0)
643                 goto err_assign;
644
645         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
646
647         err = vlan_proc_init(net);
648         if (err < 0)
649                 goto err_proc;
650
651         return 0;
652
653 err_proc:
654         /* nothing */
655 err_assign:
656         kfree(vn);
657 err_alloc:
658         return err;
659 }
660
661 static void vlan_exit_net(struct net *net)
662 {
663         struct vlan_net *vn;
664
665         vn = net_generic(net, vlan_net_id);
666         rtnl_kill_links(net, &vlan_link_ops);
667         vlan_proc_cleanup(net);
668         kfree(vn);
669 }
670
671 static struct pernet_operations vlan_net_ops = {
672         .init = vlan_init_net,
673         .exit = vlan_exit_net,
674 };
675
676 static int __init vlan_proto_init(void)
677 {
678         int err;
679
680         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
681         pr_info("All bugs added by %s\n", vlan_buggyright);
682
683         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
684         if (err < 0)
685                 goto err0;
686
687         err = register_netdevice_notifier(&vlan_notifier_block);
688         if (err < 0)
689                 goto err2;
690
691         err = vlan_netlink_init();
692         if (err < 0)
693                 goto err3;
694
695         dev_add_pack(&vlan_packet_type);
696         vlan_ioctl_set(vlan_ioctl_handler);
697         return 0;
698
699 err3:
700         unregister_netdevice_notifier(&vlan_notifier_block);
701 err2:
702         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
703 err0:
704         return err;
705 }
706
707 static void __exit vlan_cleanup_module(void)
708 {
709         unsigned int i;
710
711         vlan_ioctl_set(NULL);
712         vlan_netlink_fini();
713
714         unregister_netdevice_notifier(&vlan_notifier_block);
715
716         dev_remove_pack(&vlan_packet_type);
717
718         /* This table must be empty if there are no module references left. */
719         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
720                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
721
722         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
723
724         synchronize_net();
725 }
726
727 module_init(vlan_proto_init);
728 module_exit(vlan_cleanup_module);
729
730 MODULE_LICENSE("GPL");
731 MODULE_VERSION(DRV_VERSION);