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Merge branch 'linus' into x86/i8259
[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         /* Take it out of our own structures, but be sure to interlock with
158          * HW accelerating devices or SW vlan input packet processing.
159          */
160         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
161                 real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
162
163         vlan_group_set_device(grp, vlan_id, NULL);
164         grp->nr_vlans--;
165
166         synchronize_net();
167
168         /* If the group is now empty, kill off the group. */
169         if (grp->nr_vlans == 0) {
170                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
171                         real_dev->vlan_rx_register(real_dev, NULL);
172
173                 hlist_del_rcu(&grp->hlist);
174
175                 /* Free the group, after all cpu's are done. */
176                 call_rcu(&grp->rcu, vlan_rcu_free);
177         }
178
179         /* Get rid of the vlan's reference to real_dev */
180         dev_put(real_dev);
181
182         unregister_netdevice(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, unsigned short 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         unsigned short 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         }
253
254         err = vlan_group_prealloc_vid(grp, vlan_id);
255         if (err < 0)
256                 goto out_free_group;
257
258         err = register_netdevice(dev);
259         if (err < 0)
260                 goto out_free_group;
261
262         /* Account for reference in struct vlan_dev_info */
263         dev_hold(real_dev);
264
265         vlan_transfer_operstate(real_dev, dev);
266         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
267
268         /* So, got the sucker initialized, now lets place
269          * it into our local structure.
270          */
271         vlan_group_set_device(grp, vlan_id, dev);
272         grp->nr_vlans++;
273
274         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
275                 real_dev->vlan_rx_register(real_dev, ngrp);
276         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
277                 real_dev->vlan_rx_add_vid(real_dev, vlan_id);
278
279         return 0;
280
281 out_free_group:
282         if (ngrp)
283                 vlan_group_free(ngrp);
284         return err;
285 }
286
287 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
288  *  Returns 0 if the device was created or a negative error code otherwise.
289  */
290 static int register_vlan_device(struct net_device *real_dev,
291                                 unsigned short VLAN_ID)
292 {
293         struct net_device *new_dev;
294         struct net *net = dev_net(real_dev);
295         struct vlan_net *vn = net_generic(net, vlan_net_id);
296         char name[IFNAMSIZ];
297         int err;
298
299         if (VLAN_ID >= VLAN_VID_MASK)
300                 return -ERANGE;
301
302         err = vlan_check_real_dev(real_dev, VLAN_ID);
303         if (err < 0)
304                 return err;
305
306         /* Gotta set up the fields for the device. */
307         switch (vn->name_type) {
308         case VLAN_NAME_TYPE_RAW_PLUS_VID:
309                 /* name will look like:  eth1.0005 */
310                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, VLAN_ID);
311                 break;
312         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
313                 /* Put our vlan.VID in the name.
314                  * Name will look like:  vlan5
315                  */
316                 snprintf(name, IFNAMSIZ, "vlan%i", VLAN_ID);
317                 break;
318         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
319                 /* Put our vlan.VID in the name.
320                  * Name will look like:  eth0.5
321                  */
322                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, VLAN_ID);
323                 break;
324         case VLAN_NAME_TYPE_PLUS_VID:
325                 /* Put our vlan.VID in the name.
326                  * Name will look like:  vlan0005
327                  */
328         default:
329                 snprintf(name, IFNAMSIZ, "vlan%.4i", VLAN_ID);
330         }
331
332         new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name,
333                                vlan_setup);
334
335         if (new_dev == NULL)
336                 return -ENOBUFS;
337
338         dev_net_set(new_dev, net);
339         /* need 4 bytes for extra VLAN header info,
340          * hope the underlying device can handle it.
341          */
342         new_dev->mtu = real_dev->mtu;
343
344         vlan_dev_info(new_dev)->vlan_id = VLAN_ID; /* 1 through VLAN_VID_MASK */
345         vlan_dev_info(new_dev)->real_dev = real_dev;
346         vlan_dev_info(new_dev)->dent = NULL;
347         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
348
349         new_dev->rtnl_link_ops = &vlan_link_ops;
350         err = register_vlan_dev(new_dev);
351         if (err < 0)
352                 goto out_free_newdev;
353
354         return 0;
355
356 out_free_newdev:
357         free_netdev(new_dev);
358         return err;
359 }
360
361 static void vlan_sync_address(struct net_device *dev,
362                               struct net_device *vlandev)
363 {
364         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
365
366         /* May be called without an actual change */
367         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
368                 return;
369
370         /* vlan address was different from the old address and is equal to
371          * the new address */
372         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
373             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
374                 dev_unicast_delete(dev, vlandev->dev_addr, ETH_ALEN);
375
376         /* vlan address was equal to the old address and is different from
377          * the new address */
378         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
379             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
380                 dev_unicast_add(dev, vlandev->dev_addr, ETH_ALEN);
381
382         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
383 }
384
385 static void vlan_transfer_features(struct net_device *dev,
386                                    struct net_device *vlandev)
387 {
388         unsigned long old_features = vlandev->features;
389
390         vlandev->features &= ~dev->vlan_features;
391         vlandev->features |= dev->features & dev->vlan_features;
392
393         if (old_features != vlandev->features)
394                 netdev_features_change(vlandev);
395 }
396
397 static void __vlan_device_event(struct net_device *dev, unsigned long event)
398 {
399         switch (event) {
400         case NETDEV_CHANGENAME:
401                 vlan_proc_rem_dev(dev);
402                 if (vlan_proc_add_dev(dev) < 0)
403                         pr_warning("8021q: failed to change proc name for %s\n",
404                                         dev->name);
405                 break;
406         case NETDEV_REGISTER:
407                 if (vlan_proc_add_dev(dev) < 0)
408                         pr_warning("8021q: failed to add proc entry for %s\n",
409                                         dev->name);
410                 break;
411         case NETDEV_UNREGISTER:
412                 vlan_proc_rem_dev(dev);
413                 break;
414         }
415 }
416
417 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
418                              void *ptr)
419 {
420         struct net_device *dev = ptr;
421         struct vlan_group *grp;
422         int i, flgs;
423         struct net_device *vlandev;
424
425         if (is_vlan_dev(dev))
426                 __vlan_device_event(dev, event);
427
428         grp = __vlan_find_group(dev);
429         if (!grp)
430                 goto out;
431
432         /* It is OK that we do not hold the group lock right now,
433          * as we run under the RTNL lock.
434          */
435
436         switch (event) {
437         case NETDEV_CHANGE:
438                 /* Propagate real device state to vlan devices */
439                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
440                         vlandev = vlan_group_get_device(grp, i);
441                         if (!vlandev)
442                                 continue;
443
444                         vlan_transfer_operstate(dev, vlandev);
445                 }
446                 break;
447
448         case NETDEV_CHANGEADDR:
449                 /* Adjust unicast filters on underlying device */
450                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
451                         vlandev = vlan_group_get_device(grp, i);
452                         if (!vlandev)
453                                 continue;
454
455                         flgs = vlandev->flags;
456                         if (!(flgs & IFF_UP))
457                                 continue;
458
459                         vlan_sync_address(dev, vlandev);
460                 }
461                 break;
462
463         case NETDEV_FEAT_CHANGE:
464                 /* Propagate device features to underlying device */
465                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
466                         vlandev = vlan_group_get_device(grp, i);
467                         if (!vlandev)
468                                 continue;
469
470                         vlan_transfer_features(dev, vlandev);
471                 }
472
473                 break;
474
475         case NETDEV_DOWN:
476                 /* Put all VLANs for this dev in the down state too.  */
477                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
478                         vlandev = vlan_group_get_device(grp, i);
479                         if (!vlandev)
480                                 continue;
481
482                         flgs = vlandev->flags;
483                         if (!(flgs & IFF_UP))
484                                 continue;
485
486                         dev_change_flags(vlandev, flgs & ~IFF_UP);
487                 }
488                 break;
489
490         case NETDEV_UP:
491                 /* Put all VLANs for this dev in the up state too.  */
492                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
493                         vlandev = vlan_group_get_device(grp, i);
494                         if (!vlandev)
495                                 continue;
496
497                         flgs = vlandev->flags;
498                         if (flgs & IFF_UP)
499                                 continue;
500
501                         dev_change_flags(vlandev, flgs | IFF_UP);
502                 }
503                 break;
504
505         case NETDEV_UNREGISTER:
506                 /* Delete all VLANs for this dev. */
507                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
508                         vlandev = vlan_group_get_device(grp, i);
509                         if (!vlandev)
510                                 continue;
511
512                         /* unregistration of last vlan destroys group, abort
513                          * afterwards */
514                         if (grp->nr_vlans == 1)
515                                 i = VLAN_GROUP_ARRAY_LEN;
516
517                         unregister_vlan_dev(vlandev);
518                 }
519                 break;
520         }
521
522 out:
523         return NOTIFY_DONE;
524 }
525
526 static struct notifier_block vlan_notifier_block __read_mostly = {
527         .notifier_call = vlan_device_event,
528 };
529
530 /*
531  *      VLAN IOCTL handler.
532  *      o execute requested action or pass command to the device driver
533  *   arg is really a struct vlan_ioctl_args __user *.
534  */
535 static int vlan_ioctl_handler(struct net *net, void __user *arg)
536 {
537         int err;
538         unsigned short vid = 0;
539         struct vlan_ioctl_args args;
540         struct net_device *dev = NULL;
541
542         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
543                 return -EFAULT;
544
545         /* Null terminate this sucker, just in case. */
546         args.device1[23] = 0;
547         args.u.device2[23] = 0;
548
549         rtnl_lock();
550
551         switch (args.cmd) {
552         case SET_VLAN_INGRESS_PRIORITY_CMD:
553         case SET_VLAN_EGRESS_PRIORITY_CMD:
554         case SET_VLAN_FLAG_CMD:
555         case ADD_VLAN_CMD:
556         case DEL_VLAN_CMD:
557         case GET_VLAN_REALDEV_NAME_CMD:
558         case GET_VLAN_VID_CMD:
559                 err = -ENODEV;
560                 dev = __dev_get_by_name(net, args.device1);
561                 if (!dev)
562                         goto out;
563
564                 err = -EINVAL;
565                 if (args.cmd != ADD_VLAN_CMD &&
566                     !(dev->priv_flags & IFF_802_1Q_VLAN))
567                         goto out;
568         }
569
570         switch (args.cmd) {
571         case SET_VLAN_INGRESS_PRIORITY_CMD:
572                 err = -EPERM;
573                 if (!capable(CAP_NET_ADMIN))
574                         break;
575                 vlan_dev_set_ingress_priority(dev,
576                                               args.u.skb_priority,
577                                               args.vlan_qos);
578                 err = 0;
579                 break;
580
581         case SET_VLAN_EGRESS_PRIORITY_CMD:
582                 err = -EPERM;
583                 if (!capable(CAP_NET_ADMIN))
584                         break;
585                 err = vlan_dev_set_egress_priority(dev,
586                                                    args.u.skb_priority,
587                                                    args.vlan_qos);
588                 break;
589
590         case SET_VLAN_FLAG_CMD:
591                 err = -EPERM;
592                 if (!capable(CAP_NET_ADMIN))
593                         break;
594                 err = vlan_dev_set_vlan_flag(dev,
595                                              args.u.flag,
596                                              args.vlan_qos);
597                 break;
598
599         case SET_VLAN_NAME_TYPE_CMD:
600                 err = -EPERM;
601                 if (!capable(CAP_NET_ADMIN))
602                         break;
603                 if ((args.u.name_type >= 0) &&
604                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
605                         struct vlan_net *vn;
606
607                         vn = net_generic(net, vlan_net_id);
608                         vn->name_type = args.u.name_type;
609                         err = 0;
610                 } else {
611                         err = -EINVAL;
612                 }
613                 break;
614
615         case ADD_VLAN_CMD:
616                 err = -EPERM;
617                 if (!capable(CAP_NET_ADMIN))
618                         break;
619                 err = register_vlan_device(dev, args.u.VID);
620                 break;
621
622         case DEL_VLAN_CMD:
623                 err = -EPERM;
624                 if (!capable(CAP_NET_ADMIN))
625                         break;
626                 unregister_vlan_dev(dev);
627                 err = 0;
628                 break;
629
630         case GET_VLAN_REALDEV_NAME_CMD:
631                 err = 0;
632                 vlan_dev_get_realdev_name(dev, args.u.device2);
633                 if (copy_to_user(arg, &args,
634                                  sizeof(struct vlan_ioctl_args)))
635                         err = -EFAULT;
636                 break;
637
638         case GET_VLAN_VID_CMD:
639                 err = 0;
640                 vlan_dev_get_vid(dev, &vid);
641                 args.u.VID = vid;
642                 if (copy_to_user(arg, &args,
643                                  sizeof(struct vlan_ioctl_args)))
644                       err = -EFAULT;
645                 break;
646
647         default:
648                 err = -EOPNOTSUPP;
649                 break;
650         }
651 out:
652         rtnl_unlock();
653         return err;
654 }
655
656 static int vlan_init_net(struct net *net)
657 {
658         int err;
659         struct vlan_net *vn;
660
661         err = -ENOMEM;
662         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
663         if (vn == NULL)
664                 goto err_alloc;
665
666         err = net_assign_generic(net, vlan_net_id, vn);
667         if (err < 0)
668                 goto err_assign;
669
670         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
671
672         err = vlan_proc_init(net);
673         if (err < 0)
674                 goto err_proc;
675
676         return 0;
677
678 err_proc:
679         /* nothing */
680 err_assign:
681         kfree(vn);
682 err_alloc:
683         return err;
684 }
685
686 static void vlan_exit_net(struct net *net)
687 {
688         struct vlan_net *vn;
689
690         vn = net_generic(net, vlan_net_id);
691         rtnl_kill_links(net, &vlan_link_ops);
692         vlan_proc_cleanup(net);
693         kfree(vn);
694 }
695
696 static struct pernet_operations vlan_net_ops = {
697         .init = vlan_init_net,
698         .exit = vlan_exit_net,
699 };
700
701 static int __init vlan_proto_init(void)
702 {
703         int err;
704
705         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
706         pr_info("All bugs added by %s\n", vlan_buggyright);
707
708         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
709         if (err < 0)
710                 goto err0;
711
712         err = register_netdevice_notifier(&vlan_notifier_block);
713         if (err < 0)
714                 goto err2;
715
716         err = vlan_netlink_init();
717         if (err < 0)
718                 goto err3;
719
720         dev_add_pack(&vlan_packet_type);
721         vlan_ioctl_set(vlan_ioctl_handler);
722         return 0;
723
724 err3:
725         unregister_netdevice_notifier(&vlan_notifier_block);
726 err2:
727         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
728 err0:
729         return err;
730 }
731
732 static void __exit vlan_cleanup_module(void)
733 {
734         unsigned int i;
735
736         vlan_ioctl_set(NULL);
737         vlan_netlink_fini();
738
739         unregister_netdevice_notifier(&vlan_notifier_block);
740
741         dev_remove_pack(&vlan_packet_type);
742
743         /* This table must be empty if there are no module references left. */
744         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
745                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
746
747         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
748
749         synchronize_net();
750 }
751
752 module_init(vlan_proto_init);
753 module_exit(vlan_cleanup_module);
754
755 MODULE_LICENSE("GPL");
756 MODULE_VERSION(DRV_VERSION);