Phonet: basic net namespace support
[linux-3.10.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/init.h>
26 #include <linux/rculist.h>
27 #include <net/p8022.h>
28 #include <net/arp.h>
29 #include <linux/rtnetlink.h>
30 #include <linux/notifier.h>
31 #include <net/rtnetlink.h>
32 #include <net/net_namespace.h>
33 #include <net/netns/generic.h>
34 #include <asm/uaccess.h>
35
36 #include <linux/if_vlan.h>
37 #include "vlan.h"
38 #include "vlanproc.h"
39
40 #define DRV_VERSION "1.8"
41
42 /* Global VLAN variables */
43
44 int vlan_net_id;
45
46 /* Our listing of VLAN group(s) */
47 static struct hlist_head vlan_group_hash[VLAN_GRP_HASH_SIZE];
48
49 const char vlan_fullname[] = "802.1Q VLAN Support";
50 const char vlan_version[] = DRV_VERSION;
51 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
52 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
53
54 static struct packet_type vlan_packet_type = {
55         .type = __constant_htons(ETH_P_8021Q),
56         .func = vlan_skb_recv, /* VLAN receive method */
57 };
58
59 /* End of global variables definitions. */
60
61 static inline unsigned int vlan_grp_hashfn(unsigned int idx)
62 {
63         return ((idx >> VLAN_GRP_HASH_SHIFT) ^ idx) & VLAN_GRP_HASH_MASK;
64 }
65
66 /* Must be invoked with RCU read lock (no preempt) */
67 static struct vlan_group *__vlan_find_group(struct net_device *real_dev)
68 {
69         struct vlan_group *grp;
70         struct hlist_node *n;
71         int hash = vlan_grp_hashfn(real_dev->ifindex);
72
73         hlist_for_each_entry_rcu(grp, n, &vlan_group_hash[hash], hlist) {
74                 if (grp->real_dev == real_dev)
75                         return grp;
76         }
77
78         return NULL;
79 }
80
81 /*  Find the protocol handler.  Assumes VID < VLAN_VID_MASK.
82  *
83  * Must be invoked with RCU read lock (no preempt)
84  */
85 struct net_device *__find_vlan_dev(struct net_device *real_dev, u16 vlan_id)
86 {
87         struct vlan_group *grp = __vlan_find_group(real_dev);
88
89         if (grp)
90                 return vlan_group_get_device(grp, vlan_id);
91
92         return NULL;
93 }
94
95 static void vlan_group_free(struct vlan_group *grp)
96 {
97         int i;
98
99         for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
100                 kfree(grp->vlan_devices_arrays[i]);
101         kfree(grp);
102 }
103
104 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
105 {
106         struct vlan_group *grp;
107
108         grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
109         if (!grp)
110                 return NULL;
111
112         grp->real_dev = real_dev;
113         hlist_add_head_rcu(&grp->hlist,
114                         &vlan_group_hash[vlan_grp_hashfn(real_dev->ifindex)]);
115         return grp;
116 }
117
118 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
119 {
120         struct net_device **array;
121         unsigned int size;
122
123         ASSERT_RTNL();
124
125         array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
126         if (array != NULL)
127                 return 0;
128
129         size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
130         array = kzalloc(size, GFP_KERNEL);
131         if (array == NULL)
132                 return -ENOBUFS;
133
134         vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
135         return 0;
136 }
137
138 static void vlan_rcu_free(struct rcu_head *rcu)
139 {
140         vlan_group_free(container_of(rcu, struct vlan_group, rcu));
141 }
142
143 void unregister_vlan_dev(struct net_device *dev)
144 {
145         struct vlan_dev_info *vlan = vlan_dev_info(dev);
146         struct net_device *real_dev = vlan->real_dev;
147         const struct net_device_ops *ops = real_dev->netdev_ops;
148         struct vlan_group *grp;
149         u16 vlan_id = vlan->vlan_id;
150
151         ASSERT_RTNL();
152
153         grp = __vlan_find_group(real_dev);
154         BUG_ON(!grp);
155
156         /* Take it out of our own structures, but be sure to interlock with
157          * HW accelerating devices or SW vlan input packet processing.
158          */
159         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
160                 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
161
162         vlan_group_set_device(grp, vlan_id, NULL);
163         grp->nr_vlans--;
164
165         synchronize_net();
166
167         unregister_netdevice(dev);
168
169         /* If the group is now empty, kill off the group. */
170         if (grp->nr_vlans == 0) {
171                 vlan_gvrp_uninit_applicant(real_dev);
172
173                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
174                         ops->ndo_vlan_rx_register(real_dev, NULL);
175
176                 hlist_del_rcu(&grp->hlist);
177
178                 /* Free the group, after all cpu's are done. */
179                 call_rcu(&grp->rcu, vlan_rcu_free);
180         }
181
182         /* Get rid of the vlan's reference to real_dev */
183         dev_put(real_dev);
184 }
185
186 static void vlan_transfer_operstate(const struct net_device *dev,
187                                     struct net_device *vlandev)
188 {
189         /* Have to respect userspace enforced dormant state
190          * of real device, also must allow supplicant running
191          * on VLAN device
192          */
193         if (dev->operstate == IF_OPER_DORMANT)
194                 netif_dormant_on(vlandev);
195         else
196                 netif_dormant_off(vlandev);
197
198         if (netif_carrier_ok(dev)) {
199                 if (!netif_carrier_ok(vlandev))
200                         netif_carrier_on(vlandev);
201         } else {
202                 if (netif_carrier_ok(vlandev))
203                         netif_carrier_off(vlandev);
204         }
205 }
206
207 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
208 {
209         const char *name = real_dev->name;
210         const struct net_device_ops *ops = real_dev->netdev_ops;
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) && !ops->ndo_vlan_rx_register) {
218                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
219                 return -EOPNOTSUPP;
220         }
221
222         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
223             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
224                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
225                 return -EOPNOTSUPP;
226         }
227
228         /* The real device must be up and operating in order to
229          * assosciate a VLAN device with it.
230          */
231         if (!(real_dev->flags & IFF_UP))
232                 return -ENETDOWN;
233
234         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
235                 return -EEXIST;
236
237         return 0;
238 }
239
240 int register_vlan_dev(struct net_device *dev)
241 {
242         struct vlan_dev_info *vlan = vlan_dev_info(dev);
243         struct net_device *real_dev = vlan->real_dev;
244         const struct net_device_ops *ops = real_dev->netdev_ops;
245         u16 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                 err = vlan_gvrp_init_applicant(real_dev);
255                 if (err < 0)
256                         goto out_free_group;
257         }
258
259         err = vlan_group_prealloc_vid(grp, vlan_id);
260         if (err < 0)
261                 goto out_uninit_applicant;
262
263         err = register_netdevice(dev);
264         if (err < 0)
265                 goto out_uninit_applicant;
266
267         /* Account for reference in struct vlan_dev_info */
268         dev_hold(real_dev);
269
270         vlan_transfer_operstate(real_dev, dev);
271         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
272
273         /* So, got the sucker initialized, now lets place
274          * it into our local structure.
275          */
276         vlan_group_set_device(grp, vlan_id, dev);
277         grp->nr_vlans++;
278
279         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
280                 ops->ndo_vlan_rx_register(real_dev, ngrp);
281         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
282                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
283
284         return 0;
285
286 out_uninit_applicant:
287         if (ngrp)
288                 vlan_gvrp_uninit_applicant(real_dev);
289 out_free_group:
290         if (ngrp)
291                 vlan_group_free(ngrp);
292         return err;
293 }
294
295 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
296  *  Returns 0 if the device was created or a negative error code otherwise.
297  */
298 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
299 {
300         struct net_device *new_dev;
301         struct net *net = dev_net(real_dev);
302         struct vlan_net *vn = net_generic(net, vlan_net_id);
303         char name[IFNAMSIZ];
304         int err;
305
306         if (vlan_id >= VLAN_VID_MASK)
307                 return -ERANGE;
308
309         err = vlan_check_real_dev(real_dev, vlan_id);
310         if (err < 0)
311                 return err;
312
313         /* Gotta set up the fields for the device. */
314         switch (vn->name_type) {
315         case VLAN_NAME_TYPE_RAW_PLUS_VID:
316                 /* name will look like:  eth1.0005 */
317                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
318                 break;
319         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
320                 /* Put our vlan.VID in the name.
321                  * Name will look like:  vlan5
322                  */
323                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
324                 break;
325         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
326                 /* Put our vlan.VID in the name.
327                  * Name will look like:  eth0.5
328                  */
329                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
330                 break;
331         case VLAN_NAME_TYPE_PLUS_VID:
332                 /* Put our vlan.VID in the name.
333                  * Name will look like:  vlan0005
334                  */
335         default:
336                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
337         }
338
339         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
340                                vlan_setup);
341
342         if (new_dev == NULL)
343                 return -ENOBUFS;
344
345         dev_net_set(new_dev, net);
346         /* need 4 bytes for extra VLAN header info,
347          * hope the underlying device can handle it.
348          */
349         new_dev->mtu = real_dev->mtu;
350
351         vlan_dev_info(new_dev)->vlan_id = vlan_id;
352         vlan_dev_info(new_dev)->real_dev = real_dev;
353         vlan_dev_info(new_dev)->dent = NULL;
354         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
355
356         new_dev->rtnl_link_ops = &vlan_link_ops;
357         err = register_vlan_dev(new_dev);
358         if (err < 0)
359                 goto out_free_newdev;
360
361         return 0;
362
363 out_free_newdev:
364         free_netdev(new_dev);
365         return err;
366 }
367
368 static void vlan_sync_address(struct net_device *dev,
369                               struct net_device *vlandev)
370 {
371         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
372
373         /* May be called without an actual change */
374         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
375                 return;
376
377         /* vlan address was different from the old address and is equal to
378          * the new address */
379         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
380             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
381                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
382
383         /* vlan address was equal to the old address and is different from
384          * the new address */
385         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
386             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
387                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
388
389         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
390 }
391
392 static void vlan_transfer_features(struct net_device *dev,
393                                    struct net_device *vlandev)
394 {
395         unsigned long old_features = vlandev->features;
396
397         vlandev->features &= ~dev->vlan_features;
398         vlandev->features |= dev->features & dev->vlan_features;
399         vlandev->gso_max_size = dev->gso_max_size;
400
401         if (old_features != vlandev->features)
402                 netdev_features_change(vlandev);
403 }
404
405 static void __vlan_device_event(struct net_device *dev, unsigned long event)
406 {
407         switch (event) {
408         case NETDEV_CHANGENAME:
409                 vlan_proc_rem_dev(dev);
410                 if (vlan_proc_add_dev(dev) < 0)
411                         pr_warning("8021q: failed to change proc name for %s\n",
412                                         dev->name);
413                 break;
414         case NETDEV_REGISTER:
415                 if (vlan_proc_add_dev(dev) < 0)
416                         pr_warning("8021q: failed to add proc entry for %s\n",
417                                         dev->name);
418                 break;
419         case NETDEV_UNREGISTER:
420                 vlan_proc_rem_dev(dev);
421                 break;
422         }
423 }
424
425 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
426                              void *ptr)
427 {
428         struct net_device *dev = ptr;
429         struct vlan_group *grp;
430         int i, flgs;
431         struct net_device *vlandev;
432
433         if (is_vlan_dev(dev))
434                 __vlan_device_event(dev, event);
435
436         grp = __vlan_find_group(dev);
437         if (!grp)
438                 goto out;
439
440         /* It is OK that we do not hold the group lock right now,
441          * as we run under the RTNL lock.
442          */
443
444         switch (event) {
445         case NETDEV_CHANGE:
446                 /* Propagate real device state to vlan devices */
447                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
448                         vlandev = vlan_group_get_device(grp, i);
449                         if (!vlandev)
450                                 continue;
451
452                         vlan_transfer_operstate(dev, vlandev);
453                 }
454                 break;
455
456         case NETDEV_CHANGEADDR:
457                 /* Adjust unicast filters on underlying device */
458                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
459                         vlandev = vlan_group_get_device(grp, i);
460                         if (!vlandev)
461                                 continue;
462
463                         flgs = vlandev->flags;
464                         if (!(flgs & IFF_UP))
465                                 continue;
466
467                         vlan_sync_address(dev, vlandev);
468                 }
469                 break;
470
471         case NETDEV_FEAT_CHANGE:
472                 /* Propagate device features to underlying device */
473                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
474                         vlandev = vlan_group_get_device(grp, i);
475                         if (!vlandev)
476                                 continue;
477
478                         vlan_transfer_features(dev, vlandev);
479                 }
480
481                 break;
482
483         case NETDEV_DOWN:
484                 /* Put all VLANs for this dev in the down state too.  */
485                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
486                         vlandev = vlan_group_get_device(grp, i);
487                         if (!vlandev)
488                                 continue;
489
490                         flgs = vlandev->flags;
491                         if (!(flgs & IFF_UP))
492                                 continue;
493
494                         dev_change_flags(vlandev, flgs & ~IFF_UP);
495                 }
496                 break;
497
498         case NETDEV_UP:
499                 /* Put all VLANs for this dev in the up state too.  */
500                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
501                         vlandev = vlan_group_get_device(grp, i);
502                         if (!vlandev)
503                                 continue;
504
505                         flgs = vlandev->flags;
506                         if (flgs & IFF_UP)
507                                 continue;
508
509                         dev_change_flags(vlandev, flgs | IFF_UP);
510                 }
511                 break;
512
513         case NETDEV_UNREGISTER:
514                 /* Delete all VLANs for this dev. */
515                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
516                         vlandev = vlan_group_get_device(grp, i);
517                         if (!vlandev)
518                                 continue;
519
520                         /* unregistration of last vlan destroys group, abort
521                          * afterwards */
522                         if (grp->nr_vlans == 1)
523                                 i = VLAN_GROUP_ARRAY_LEN;
524
525                         unregister_vlan_dev(vlandev);
526                 }
527                 break;
528         }
529
530 out:
531         return NOTIFY_DONE;
532 }
533
534 static struct notifier_block vlan_notifier_block __read_mostly = {
535         .notifier_call = vlan_device_event,
536 };
537
538 /*
539  *      VLAN IOCTL handler.
540  *      o execute requested action or pass command to the device driver
541  *   arg is really a struct vlan_ioctl_args __user *.
542  */
543 static int vlan_ioctl_handler(struct net *net, void __user *arg)
544 {
545         int err;
546         struct vlan_ioctl_args args;
547         struct net_device *dev = NULL;
548
549         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
550                 return -EFAULT;
551
552         /* Null terminate this sucker, just in case. */
553         args.device1[23] = 0;
554         args.u.device2[23] = 0;
555
556         rtnl_lock();
557
558         switch (args.cmd) {
559         case SET_VLAN_INGRESS_PRIORITY_CMD:
560         case SET_VLAN_EGRESS_PRIORITY_CMD:
561         case SET_VLAN_FLAG_CMD:
562         case ADD_VLAN_CMD:
563         case DEL_VLAN_CMD:
564         case GET_VLAN_REALDEV_NAME_CMD:
565         case GET_VLAN_VID_CMD:
566                 err = -ENODEV;
567                 dev = __dev_get_by_name(net, args.device1);
568                 if (!dev)
569                         goto out;
570
571                 err = -EINVAL;
572                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
573                         goto out;
574         }
575
576         switch (args.cmd) {
577         case SET_VLAN_INGRESS_PRIORITY_CMD:
578                 err = -EPERM;
579                 if (!capable(CAP_NET_ADMIN))
580                         break;
581                 vlan_dev_set_ingress_priority(dev,
582                                               args.u.skb_priority,
583                                               args.vlan_qos);
584                 err = 0;
585                 break;
586
587         case SET_VLAN_EGRESS_PRIORITY_CMD:
588                 err = -EPERM;
589                 if (!capable(CAP_NET_ADMIN))
590                         break;
591                 err = vlan_dev_set_egress_priority(dev,
592                                                    args.u.skb_priority,
593                                                    args.vlan_qos);
594                 break;
595
596         case SET_VLAN_FLAG_CMD:
597                 err = -EPERM;
598                 if (!capable(CAP_NET_ADMIN))
599                         break;
600                 err = vlan_dev_change_flags(dev,
601                                             args.vlan_qos ? args.u.flag : 0,
602                                             args.u.flag);
603                 break;
604
605         case SET_VLAN_NAME_TYPE_CMD:
606                 err = -EPERM;
607                 if (!capable(CAP_NET_ADMIN))
608                         break;
609                 if ((args.u.name_type >= 0) &&
610                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
611                         struct vlan_net *vn;
612
613                         vn = net_generic(net, vlan_net_id);
614                         vn->name_type = args.u.name_type;
615                         err = 0;
616                 } else {
617                         err = -EINVAL;
618                 }
619                 break;
620
621         case ADD_VLAN_CMD:
622                 err = -EPERM;
623                 if (!capable(CAP_NET_ADMIN))
624                         break;
625                 err = register_vlan_device(dev, args.u.VID);
626                 break;
627
628         case DEL_VLAN_CMD:
629                 err = -EPERM;
630                 if (!capable(CAP_NET_ADMIN))
631                         break;
632                 unregister_vlan_dev(dev);
633                 err = 0;
634                 break;
635
636         case GET_VLAN_REALDEV_NAME_CMD:
637                 err = 0;
638                 vlan_dev_get_realdev_name(dev, args.u.device2);
639                 if (copy_to_user(arg, &args,
640                                  sizeof(struct vlan_ioctl_args)))
641                         err = -EFAULT;
642                 break;
643
644         case GET_VLAN_VID_CMD:
645                 err = 0;
646                 args.u.VID = vlan_dev_vlan_id(dev);
647                 if (copy_to_user(arg, &args,
648                                  sizeof(struct vlan_ioctl_args)))
649                       err = -EFAULT;
650                 break;
651
652         default:
653                 err = -EOPNOTSUPP;
654                 break;
655         }
656 out:
657         rtnl_unlock();
658         return err;
659 }
660
661 static int vlan_init_net(struct net *net)
662 {
663         int err;
664         struct vlan_net *vn;
665
666         err = -ENOMEM;
667         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
668         if (vn == NULL)
669                 goto err_alloc;
670
671         err = net_assign_generic(net, vlan_net_id, vn);
672         if (err < 0)
673                 goto err_assign;
674
675         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
676
677         err = vlan_proc_init(net);
678         if (err < 0)
679                 goto err_proc;
680
681         return 0;
682
683 err_proc:
684         /* nothing */
685 err_assign:
686         kfree(vn);
687 err_alloc:
688         return err;
689 }
690
691 static void vlan_exit_net(struct net *net)
692 {
693         struct vlan_net *vn;
694
695         vn = net_generic(net, vlan_net_id);
696         rtnl_kill_links(net, &vlan_link_ops);
697         vlan_proc_cleanup(net);
698         kfree(vn);
699 }
700
701 static struct pernet_operations vlan_net_ops = {
702         .init = vlan_init_net,
703         .exit = vlan_exit_net,
704 };
705
706 static int __init vlan_proto_init(void)
707 {
708         int err;
709
710         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
711         pr_info("All bugs added by %s\n", vlan_buggyright);
712
713         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
714         if (err < 0)
715                 goto err0;
716
717         err = register_netdevice_notifier(&vlan_notifier_block);
718         if (err < 0)
719                 goto err2;
720
721         err = vlan_gvrp_init();
722         if (err < 0)
723                 goto err3;
724
725         err = vlan_netlink_init();
726         if (err < 0)
727                 goto err4;
728
729         dev_add_pack(&vlan_packet_type);
730         vlan_ioctl_set(vlan_ioctl_handler);
731         return 0;
732
733 err4:
734         vlan_gvrp_uninit();
735 err3:
736         unregister_netdevice_notifier(&vlan_notifier_block);
737 err2:
738         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
739 err0:
740         return err;
741 }
742
743 static void __exit vlan_cleanup_module(void)
744 {
745         unsigned int i;
746
747         vlan_ioctl_set(NULL);
748         vlan_netlink_fini();
749
750         unregister_netdevice_notifier(&vlan_notifier_block);
751
752         dev_remove_pack(&vlan_packet_type);
753
754         /* This table must be empty if there are no module references left. */
755         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
756                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
757
758         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
759         synchronize_net();
760
761         vlan_gvrp_uninit();
762 }
763
764 module_init(vlan_proto_init);
765 module_exit(vlan_cleanup_module);
766
767 MODULE_LICENSE("GPL");
768 MODULE_VERSION(DRV_VERSION);