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[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 <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 static char vlan_fullname[] = "802.1Q VLAN Support";
50 static char vlan_version[] = DRV_VERSION;
51 static char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
52 static 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         struct vlan_group *grp;
148         u16 vlan_id = vlan->vlan_id;
149
150         ASSERT_RTNL();
151
152         grp = __vlan_find_group(real_dev);
153         BUG_ON(!grp);
154
155         /* Take it out of our own structures, but be sure to interlock with
156          * HW accelerating devices or SW vlan input packet processing.
157          */
158         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
159                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
160
161         vlan_group_set_device(grp, vlan_id, NULL);
162         grp->nr_vlans--;
163
164         synchronize_net();
165
166         unregister_netdevice(dev);
167
168         /* If the group is now empty, kill off the group. */
169         if (grp->nr_vlans == 0) {
170                 vlan_gvrp_uninit_applicant(real_dev);
171
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
185 static void vlan_transfer_operstate(const struct net_device *dev,
186                                     struct net_device *vlandev)
187 {
188         /* Have to respect userspace enforced dormant state
189          * of real device, also must allow supplicant running
190          * on VLAN device
191          */
192         if (dev->operstate == IF_OPER_DORMANT)
193                 netif_dormant_on(vlandev);
194         else
195                 netif_dormant_off(vlandev);
196
197         if (netif_carrier_ok(dev)) {
198                 if (!netif_carrier_ok(vlandev))
199                         netif_carrier_on(vlandev);
200         } else {
201                 if (netif_carrier_ok(vlandev))
202                         netif_carrier_off(vlandev);
203         }
204 }
205
206 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
207 {
208         char *name = real_dev->name;
209
210         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
211                 pr_info("8021q: VLANs not supported on %s\n", name);
212                 return -EOPNOTSUPP;
213         }
214
215         if ((real_dev->features & NETIF_F_HW_VLAN_RX) &&
216             !real_dev->vlan_rx_register) {
217                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
218                 return -EOPNOTSUPP;
219         }
220
221         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
222             (!real_dev->vlan_rx_add_vid || !real_dev->vlan_rx_kill_vid)) {
223                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
224                 return -EOPNOTSUPP;
225         }
226
227         /* The real device must be up and operating in order to
228          * assosciate a VLAN device with it.
229          */
230         if (!(real_dev->flags & IFF_UP))
231                 return -ENETDOWN;
232
233         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
234                 return -EEXIST;
235
236         return 0;
237 }
238
239 int register_vlan_dev(struct net_device *dev)
240 {
241         struct vlan_dev_info *vlan = vlan_dev_info(dev);
242         struct net_device *real_dev = vlan->real_dev;
243         u16 vlan_id = vlan->vlan_id;
244         struct vlan_group *grp, *ngrp = NULL;
245         int err;
246
247         grp = __vlan_find_group(real_dev);
248         if (!grp) {
249                 ngrp = grp = vlan_group_alloc(real_dev);
250                 if (!grp)
251                         return -ENOBUFS;
252                 err = vlan_gvrp_init_applicant(real_dev);
253                 if (err < 0)
254                         goto out_free_group;
255         }
256
257         err = vlan_group_prealloc_vid(grp, vlan_id);
258         if (err < 0)
259                 goto out_uninit_applicant;
260
261         err = register_netdevice(dev);
262         if (err < 0)
263                 goto out_uninit_applicant;
264
265         /* Account for reference in struct vlan_dev_info */
266         dev_hold(real_dev);
267
268         vlan_transfer_operstate(real_dev, dev);
269         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
270
271         /* So, got the sucker initialized, now lets place
272          * it into our local structure.
273          */
274         vlan_group_set_device(grp, vlan_id, dev);
275         grp->nr_vlans++;
276
277         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
278                 real_dev->vlan_rx_register(real_dev, ngrp);
279         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
280                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
281
282         return 0;
283
284 out_uninit_applicant:
285         if (ngrp)
286                 vlan_gvrp_uninit_applicant(real_dev);
287 out_free_group:
288         if (ngrp)
289                 vlan_group_free(ngrp);
290         return err;
291 }
292
293 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
294  *  Returns 0 if the device was created or a negative error code otherwise.
295  */
296 static int register_vlan_device(struct net_device *real_dev, u16 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;
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_transfer_features(struct net_device *dev,
391                                    struct net_device *vlandev)
392 {
393         unsigned long old_features = vlandev->features;
394
395         vlandev->features &= ~dev->vlan_features;
396         vlandev->features |= dev->features & dev->vlan_features;
397
398         if (old_features != vlandev->features)
399                 netdev_features_change(vlandev);
400 }
401
402 static void __vlan_device_event(struct net_device *dev, unsigned long event)
403 {
404         switch (event) {
405         case NETDEV_CHANGENAME:
406                 vlan_proc_rem_dev(dev);
407                 if (vlan_proc_add_dev(dev) < 0)
408                         pr_warning("8021q: failed to change proc name for %s\n",
409                                         dev->name);
410                 break;
411         case NETDEV_REGISTER:
412                 if (vlan_proc_add_dev(dev) < 0)
413                         pr_warning("8021q: failed to add proc entry for %s\n",
414                                         dev->name);
415                 break;
416         case NETDEV_UNREGISTER:
417                 vlan_proc_rem_dev(dev);
418                 break;
419         }
420 }
421
422 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
423                              void *ptr)
424 {
425         struct net_device *dev = ptr;
426         struct vlan_group *grp;
427         int i, flgs;
428         struct net_device *vlandev;
429
430         if (is_vlan_dev(dev))
431                 __vlan_device_event(dev, event);
432
433         grp = __vlan_find_group(dev);
434         if (!grp)
435                 goto out;
436
437         /* It is OK that we do not hold the group lock right now,
438          * as we run under the RTNL lock.
439          */
440
441         switch (event) {
442         case NETDEV_CHANGE:
443                 /* Propagate real device state to vlan devices */
444                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
445                         vlandev = vlan_group_get_device(grp, i);
446                         if (!vlandev)
447                                 continue;
448
449                         vlan_transfer_operstate(dev, vlandev);
450                 }
451                 break;
452
453         case NETDEV_CHANGEADDR:
454                 /* Adjust unicast filters on underlying device */
455                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
456                         vlandev = vlan_group_get_device(grp, i);
457                         if (!vlandev)
458                                 continue;
459
460                         flgs = vlandev->flags;
461                         if (!(flgs & IFF_UP))
462                                 continue;
463
464                         vlan_sync_address(dev, vlandev);
465                 }
466                 break;
467
468         case NETDEV_FEAT_CHANGE:
469                 /* Propagate device features to underlying device */
470                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
471                         vlandev = vlan_group_get_device(grp, i);
472                         if (!vlandev)
473                                 continue;
474
475                         vlan_transfer_features(dev, vlandev);
476                 }
477
478                 break;
479
480         case NETDEV_DOWN:
481                 /* Put all VLANs for this dev in the down state too.  */
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                         flgs = vlandev->flags;
488                         if (!(flgs & IFF_UP))
489                                 continue;
490
491                         dev_change_flags(vlandev, flgs & ~IFF_UP);
492                 }
493                 break;
494
495         case NETDEV_UP:
496                 /* Put all VLANs for this dev in the up state too.  */
497                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
498                         vlandev = vlan_group_get_device(grp, i);
499                         if (!vlandev)
500                                 continue;
501
502                         flgs = vlandev->flags;
503                         if (flgs & IFF_UP)
504                                 continue;
505
506                         dev_change_flags(vlandev, flgs | IFF_UP);
507                 }
508                 break;
509
510         case NETDEV_UNREGISTER:
511                 /* Delete all VLANs for this dev. */
512                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
513                         vlandev = vlan_group_get_device(grp, i);
514                         if (!vlandev)
515                                 continue;
516
517                         /* unregistration of last vlan destroys group, abort
518                          * afterwards */
519                         if (grp->nr_vlans == 1)
520                                 i = VLAN_GROUP_ARRAY_LEN;
521
522                         unregister_vlan_dev(vlandev);
523                 }
524                 break;
525         }
526
527 out:
528         return NOTIFY_DONE;
529 }
530
531 static struct notifier_block vlan_notifier_block __read_mostly = {
532         .notifier_call = vlan_device_event,
533 };
534
535 /*
536  *      VLAN IOCTL handler.
537  *      o execute requested action or pass command to the device driver
538  *   arg is really a struct vlan_ioctl_args __user *.
539  */
540 static int vlan_ioctl_handler(struct net *net, void __user *arg)
541 {
542         int err;
543         struct vlan_ioctl_args args;
544         struct net_device *dev = NULL;
545
546         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
547                 return -EFAULT;
548
549         /* Null terminate this sucker, just in case. */
550         args.device1[23] = 0;
551         args.u.device2[23] = 0;
552
553         rtnl_lock();
554
555         switch (args.cmd) {
556         case SET_VLAN_INGRESS_PRIORITY_CMD:
557         case SET_VLAN_EGRESS_PRIORITY_CMD:
558         case SET_VLAN_FLAG_CMD:
559         case ADD_VLAN_CMD:
560         case DEL_VLAN_CMD:
561         case GET_VLAN_REALDEV_NAME_CMD:
562         case GET_VLAN_VID_CMD:
563                 err = -ENODEV;
564                 dev = __dev_get_by_name(net, args.device1);
565                 if (!dev)
566                         goto out;
567
568                 err = -EINVAL;
569                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
570                         goto out;
571         }
572
573         switch (args.cmd) {
574         case SET_VLAN_INGRESS_PRIORITY_CMD:
575                 err = -EPERM;
576                 if (!capable(CAP_NET_ADMIN))
577                         break;
578                 vlan_dev_set_ingress_priority(dev,
579                                               args.u.skb_priority,
580                                               args.vlan_qos);
581                 err = 0;
582                 break;
583
584         case SET_VLAN_EGRESS_PRIORITY_CMD:
585                 err = -EPERM;
586                 if (!capable(CAP_NET_ADMIN))
587                         break;
588                 err = vlan_dev_set_egress_priority(dev,
589                                                    args.u.skb_priority,
590                                                    args.vlan_qos);
591                 break;
592
593         case SET_VLAN_FLAG_CMD:
594                 err = -EPERM;
595                 if (!capable(CAP_NET_ADMIN))
596                         break;
597                 err = vlan_dev_change_flags(dev,
598                                             args.vlan_qos ? args.u.flag : 0,
599                                             args.u.flag);
600                 break;
601
602         case SET_VLAN_NAME_TYPE_CMD:
603                 err = -EPERM;
604                 if (!capable(CAP_NET_ADMIN))
605                         break;
606                 if ((args.u.name_type >= 0) &&
607                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
608                         struct vlan_net *vn;
609
610                         vn = net_generic(net, vlan_net_id);
611                         vn->name_type = args.u.name_type;
612                         err = 0;
613                 } else {
614                         err = -EINVAL;
615                 }
616                 break;
617
618         case ADD_VLAN_CMD:
619                 err = -EPERM;
620                 if (!capable(CAP_NET_ADMIN))
621                         break;
622                 err = register_vlan_device(dev, args.u.VID);
623                 break;
624
625         case DEL_VLAN_CMD:
626                 err = -EPERM;
627                 if (!capable(CAP_NET_ADMIN))
628                         break;
629                 unregister_vlan_dev(dev);
630                 err = 0;
631                 break;
632
633         case GET_VLAN_REALDEV_NAME_CMD:
634                 err = 0;
635                 vlan_dev_get_realdev_name(dev, args.u.device2);
636                 if (copy_to_user(arg, &args,
637                                  sizeof(struct vlan_ioctl_args)))
638                         err = -EFAULT;
639                 break;
640
641         case GET_VLAN_VID_CMD:
642                 err = 0;
643                 args.u.VID = vlan_dev_vlan_id(dev);
644                 if (copy_to_user(arg, &args,
645                                  sizeof(struct vlan_ioctl_args)))
646                       err = -EFAULT;
647                 break;
648
649         default:
650                 err = -EOPNOTSUPP;
651                 break;
652         }
653 out:
654         rtnl_unlock();
655         return err;
656 }
657
658 static int vlan_init_net(struct net *net)
659 {
660         int err;
661         struct vlan_net *vn;
662
663         err = -ENOMEM;
664         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
665         if (vn == NULL)
666                 goto err_alloc;
667
668         err = net_assign_generic(net, vlan_net_id, vn);
669         if (err < 0)
670                 goto err_assign;
671
672         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
673
674         err = vlan_proc_init(net);
675         if (err < 0)
676                 goto err_proc;
677
678         return 0;
679
680 err_proc:
681         /* nothing */
682 err_assign:
683         kfree(vn);
684 err_alloc:
685         return err;
686 }
687
688 static void vlan_exit_net(struct net *net)
689 {
690         struct vlan_net *vn;
691
692         vn = net_generic(net, vlan_net_id);
693         rtnl_kill_links(net, &vlan_link_ops);
694         vlan_proc_cleanup(net);
695         kfree(vn);
696 }
697
698 static struct pernet_operations vlan_net_ops = {
699         .init = vlan_init_net,
700         .exit = vlan_exit_net,
701 };
702
703 static int __init vlan_proto_init(void)
704 {
705         int err;
706
707         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
708         pr_info("All bugs added by %s\n", vlan_buggyright);
709
710         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
711         if (err < 0)
712                 goto err0;
713
714         err = register_netdevice_notifier(&vlan_notifier_block);
715         if (err < 0)
716                 goto err2;
717
718         err = vlan_gvrp_init();
719         if (err < 0)
720                 goto err3;
721
722         err = vlan_netlink_init();
723         if (err < 0)
724                 goto err4;
725
726         dev_add_pack(&vlan_packet_type);
727         vlan_ioctl_set(vlan_ioctl_handler);
728         return 0;
729
730 err4:
731         vlan_gvrp_uninit();
732 err3:
733         unregister_netdevice_notifier(&vlan_notifier_block);
734 err2:
735         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
736 err0:
737         return err;
738 }
739
740 static void __exit vlan_cleanup_module(void)
741 {
742         unsigned int i;
743
744         vlan_ioctl_set(NULL);
745         vlan_netlink_fini();
746
747         unregister_netdevice_notifier(&vlan_notifier_block);
748
749         dev_remove_pack(&vlan_packet_type);
750
751         /* This table must be empty if there are no module references left. */
752         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
753                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
754
755         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
756         synchronize_net();
757
758         vlan_gvrp_uninit();
759 }
760
761 module_init(vlan_proto_init);
762 module_exit(vlan_cleanup_module);
763
764 MODULE_LICENSE("GPL");
765 MODULE_VERSION(DRV_VERSION);