net: spread __net_init, __net_exit
[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 __read_mostly;
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 __read_mostly = {
55         .type = cpu_to_be16(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, struct list_head *head)
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         grp->nr_vlans--;
163
164         vlan_group_set_device(grp, vlan_id, NULL);
165         if (!grp->killall)
166                 synchronize_net();
167
168         unregister_netdevice_queue(dev, head);
169
170         /* If the group is now empty, kill off the group. */
171         if (grp->nr_vlans == 0) {
172                 vlan_gvrp_uninit_applicant(real_dev);
173
174                 if (real_dev->features & NETIF_F_HW_VLAN_RX)
175                         ops->ndo_vlan_rx_register(real_dev, NULL);
176
177                 hlist_del_rcu(&grp->hlist);
178
179                 /* Free the group, after all cpu's are done. */
180                 call_rcu(&grp->rcu, vlan_rcu_free);
181         }
182
183         /* Get rid of the vlan's reference to real_dev */
184         dev_put(real_dev);
185 }
186
187 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
188 {
189         const char *name = real_dev->name;
190         const struct net_device_ops *ops = real_dev->netdev_ops;
191
192         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
193                 pr_info("8021q: VLANs not supported on %s\n", name);
194                 return -EOPNOTSUPP;
195         }
196
197         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
198                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
199                 return -EOPNOTSUPP;
200         }
201
202         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
203             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
204                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
205                 return -EOPNOTSUPP;
206         }
207
208         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
209                 return -EEXIST;
210
211         return 0;
212 }
213
214 int register_vlan_dev(struct net_device *dev)
215 {
216         struct vlan_dev_info *vlan = vlan_dev_info(dev);
217         struct net_device *real_dev = vlan->real_dev;
218         const struct net_device_ops *ops = real_dev->netdev_ops;
219         u16 vlan_id = vlan->vlan_id;
220         struct vlan_group *grp, *ngrp = NULL;
221         int err;
222
223         grp = __vlan_find_group(real_dev);
224         if (!grp) {
225                 ngrp = grp = vlan_group_alloc(real_dev);
226                 if (!grp)
227                         return -ENOBUFS;
228                 err = vlan_gvrp_init_applicant(real_dev);
229                 if (err < 0)
230                         goto out_free_group;
231         }
232
233         err = vlan_group_prealloc_vid(grp, vlan_id);
234         if (err < 0)
235                 goto out_uninit_applicant;
236
237         err = register_netdevice(dev);
238         if (err < 0)
239                 goto out_uninit_applicant;
240
241         /* Account for reference in struct vlan_dev_info */
242         dev_hold(real_dev);
243
244         netif_stacked_transfer_operstate(real_dev, dev);
245         linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
246
247         /* So, got the sucker initialized, now lets place
248          * it into our local structure.
249          */
250         vlan_group_set_device(grp, vlan_id, dev);
251         grp->nr_vlans++;
252
253         if (ngrp && real_dev->features & NETIF_F_HW_VLAN_RX)
254                 ops->ndo_vlan_rx_register(real_dev, ngrp);
255         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
256                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
257
258         return 0;
259
260 out_uninit_applicant:
261         if (ngrp)
262                 vlan_gvrp_uninit_applicant(real_dev);
263 out_free_group:
264         if (ngrp) {
265                 hlist_del_rcu(&ngrp->hlist);
266                 /* Free the group, after all cpu's are done. */
267                 call_rcu(&ngrp->rcu, vlan_rcu_free);
268         }
269         return err;
270 }
271
272 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
273  *  Returns 0 if the device was created or a negative error code otherwise.
274  */
275 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
276 {
277         struct net_device *new_dev;
278         struct net *net = dev_net(real_dev);
279         struct vlan_net *vn = net_generic(net, vlan_net_id);
280         char name[IFNAMSIZ];
281         int err;
282
283         if (vlan_id >= VLAN_VID_MASK)
284                 return -ERANGE;
285
286         err = vlan_check_real_dev(real_dev, vlan_id);
287         if (err < 0)
288                 return err;
289
290         /* Gotta set up the fields for the device. */
291         switch (vn->name_type) {
292         case VLAN_NAME_TYPE_RAW_PLUS_VID:
293                 /* name will look like:  eth1.0005 */
294                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
295                 break;
296         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
297                 /* Put our vlan.VID in the name.
298                  * Name will look like:  vlan5
299                  */
300                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
301                 break;
302         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
303                 /* Put our vlan.VID in the name.
304                  * Name will look like:  eth0.5
305                  */
306                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
307                 break;
308         case VLAN_NAME_TYPE_PLUS_VID:
309                 /* Put our vlan.VID in the name.
310                  * Name will look like:  vlan0005
311                  */
312         default:
313                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
314         }
315
316         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
317                                   vlan_setup, real_dev->num_tx_queues);
318
319         if (new_dev == NULL)
320                 return -ENOBUFS;
321
322         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
323         dev_net_set(new_dev, net);
324         /* need 4 bytes for extra VLAN header info,
325          * hope the underlying device can handle it.
326          */
327         new_dev->mtu = real_dev->mtu;
328
329         vlan_dev_info(new_dev)->vlan_id = vlan_id;
330         vlan_dev_info(new_dev)->real_dev = real_dev;
331         vlan_dev_info(new_dev)->dent = NULL;
332         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
333
334         new_dev->rtnl_link_ops = &vlan_link_ops;
335         err = register_vlan_dev(new_dev);
336         if (err < 0)
337                 goto out_free_newdev;
338
339         return 0;
340
341 out_free_newdev:
342         free_netdev(new_dev);
343         return err;
344 }
345
346 static void vlan_sync_address(struct net_device *dev,
347                               struct net_device *vlandev)
348 {
349         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
350
351         /* May be called without an actual change */
352         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
353                 return;
354
355         /* vlan address was different from the old address and is equal to
356          * the new address */
357         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
358             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
359                 dev_unicast_delete(dev, vlandev->dev_addr);
360
361         /* vlan address was equal to the old address and is different from
362          * the new address */
363         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
364             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
365                 dev_unicast_add(dev, vlandev->dev_addr);
366
367         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
368 }
369
370 static void vlan_transfer_features(struct net_device *dev,
371                                    struct net_device *vlandev)
372 {
373         unsigned long old_features = vlandev->features;
374
375         vlandev->features &= ~dev->vlan_features;
376         vlandev->features |= dev->features & dev->vlan_features;
377         vlandev->gso_max_size = dev->gso_max_size;
378 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
379         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
380 #endif
381
382         if (old_features != vlandev->features)
383                 netdev_features_change(vlandev);
384 }
385
386 static void __vlan_device_event(struct net_device *dev, unsigned long event)
387 {
388         switch (event) {
389         case NETDEV_CHANGENAME:
390                 vlan_proc_rem_dev(dev);
391                 if (vlan_proc_add_dev(dev) < 0)
392                         pr_warning("8021q: failed to change proc name for %s\n",
393                                         dev->name);
394                 break;
395         case NETDEV_REGISTER:
396                 if (vlan_proc_add_dev(dev) < 0)
397                         pr_warning("8021q: failed to add proc entry for %s\n",
398                                         dev->name);
399                 break;
400         case NETDEV_UNREGISTER:
401                 vlan_proc_rem_dev(dev);
402                 break;
403         }
404 }
405
406 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
407                              void *ptr)
408 {
409         struct net_device *dev = ptr;
410         struct vlan_group *grp;
411         int i, flgs;
412         struct net_device *vlandev;
413         struct vlan_dev_info *vlan;
414         LIST_HEAD(list);
415
416         if (is_vlan_dev(dev))
417                 __vlan_device_event(dev, event);
418
419         grp = __vlan_find_group(dev);
420         if (!grp)
421                 goto out;
422
423         /* It is OK that we do not hold the group lock right now,
424          * as we run under the RTNL lock.
425          */
426
427         switch (event) {
428         case NETDEV_CHANGE:
429                 /* Propagate real device state to vlan devices */
430                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
431                         vlandev = vlan_group_get_device(grp, i);
432                         if (!vlandev)
433                                 continue;
434
435                         netif_stacked_transfer_operstate(dev, vlandev);
436                 }
437                 break;
438
439         case NETDEV_CHANGEADDR:
440                 /* Adjust unicast filters on underlying device */
441                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
442                         vlandev = vlan_group_get_device(grp, i);
443                         if (!vlandev)
444                                 continue;
445
446                         flgs = vlandev->flags;
447                         if (!(flgs & IFF_UP))
448                                 continue;
449
450                         vlan_sync_address(dev, vlandev);
451                 }
452                 break;
453
454         case NETDEV_CHANGEMTU:
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                         if (vlandev->mtu <= dev->mtu)
461                                 continue;
462
463                         dev_set_mtu(vlandev, dev->mtu);
464                 }
465                 break;
466
467         case NETDEV_FEAT_CHANGE:
468                 /* Propagate device features to underlying device */
469                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
470                         vlandev = vlan_group_get_device(grp, i);
471                         if (!vlandev)
472                                 continue;
473
474                         vlan_transfer_features(dev, vlandev);
475                 }
476
477                 break;
478
479         case NETDEV_DOWN:
480                 /* Put all VLANs for this dev in the down state too.  */
481                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
482                         vlandev = vlan_group_get_device(grp, i);
483                         if (!vlandev)
484                                 continue;
485
486                         flgs = vlandev->flags;
487                         if (!(flgs & IFF_UP))
488                                 continue;
489
490                         vlan = vlan_dev_info(vlandev);
491                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
492                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
493                         netif_stacked_transfer_operstate(dev, vlandev);
494                 }
495                 break;
496
497         case NETDEV_UP:
498                 /* Put all VLANs for this dev in the up state too.  */
499                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
500                         vlandev = vlan_group_get_device(grp, i);
501                         if (!vlandev)
502                                 continue;
503
504                         flgs = vlandev->flags;
505                         if (flgs & IFF_UP)
506                                 continue;
507
508                         vlan = vlan_dev_info(vlandev);
509                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
510                                 dev_change_flags(vlandev, flgs | IFF_UP);
511                         netif_stacked_transfer_operstate(dev, vlandev);
512                 }
513                 break;
514
515         case NETDEV_UNREGISTER:
516                 /* Delete all VLANs for this dev. */
517                 grp->killall = 1;
518
519                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
520                         vlandev = vlan_group_get_device(grp, i);
521                         if (!vlandev)
522                                 continue;
523
524                         /* unregistration of last vlan destroys group, abort
525                          * afterwards */
526                         if (grp->nr_vlans == 1)
527                                 i = VLAN_GROUP_ARRAY_LEN;
528
529                         unregister_vlan_dev(vlandev, &list);
530                 }
531                 unregister_netdevice_many(&list);
532                 break;
533         }
534
535 out:
536         return NOTIFY_DONE;
537 }
538
539 static struct notifier_block vlan_notifier_block __read_mostly = {
540         .notifier_call = vlan_device_event,
541 };
542
543 /*
544  *      VLAN IOCTL handler.
545  *      o execute requested action or pass command to the device driver
546  *   arg is really a struct vlan_ioctl_args __user *.
547  */
548 static int vlan_ioctl_handler(struct net *net, void __user *arg)
549 {
550         int err;
551         struct vlan_ioctl_args args;
552         struct net_device *dev = NULL;
553
554         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
555                 return -EFAULT;
556
557         /* Null terminate this sucker, just in case. */
558         args.device1[23] = 0;
559         args.u.device2[23] = 0;
560
561         rtnl_lock();
562
563         switch (args.cmd) {
564         case SET_VLAN_INGRESS_PRIORITY_CMD:
565         case SET_VLAN_EGRESS_PRIORITY_CMD:
566         case SET_VLAN_FLAG_CMD:
567         case ADD_VLAN_CMD:
568         case DEL_VLAN_CMD:
569         case GET_VLAN_REALDEV_NAME_CMD:
570         case GET_VLAN_VID_CMD:
571                 err = -ENODEV;
572                 dev = __dev_get_by_name(net, args.device1);
573                 if (!dev)
574                         goto out;
575
576                 err = -EINVAL;
577                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
578                         goto out;
579         }
580
581         switch (args.cmd) {
582         case SET_VLAN_INGRESS_PRIORITY_CMD:
583                 err = -EPERM;
584                 if (!capable(CAP_NET_ADMIN))
585                         break;
586                 vlan_dev_set_ingress_priority(dev,
587                                               args.u.skb_priority,
588                                               args.vlan_qos);
589                 err = 0;
590                 break;
591
592         case SET_VLAN_EGRESS_PRIORITY_CMD:
593                 err = -EPERM;
594                 if (!capable(CAP_NET_ADMIN))
595                         break;
596                 err = vlan_dev_set_egress_priority(dev,
597                                                    args.u.skb_priority,
598                                                    args.vlan_qos);
599                 break;
600
601         case SET_VLAN_FLAG_CMD:
602                 err = -EPERM;
603                 if (!capable(CAP_NET_ADMIN))
604                         break;
605                 err = vlan_dev_change_flags(dev,
606                                             args.vlan_qos ? args.u.flag : 0,
607                                             args.u.flag);
608                 break;
609
610         case SET_VLAN_NAME_TYPE_CMD:
611                 err = -EPERM;
612                 if (!capable(CAP_NET_ADMIN))
613                         break;
614                 if ((args.u.name_type >= 0) &&
615                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
616                         struct vlan_net *vn;
617
618                         vn = net_generic(net, vlan_net_id);
619                         vn->name_type = args.u.name_type;
620                         err = 0;
621                 } else {
622                         err = -EINVAL;
623                 }
624                 break;
625
626         case ADD_VLAN_CMD:
627                 err = -EPERM;
628                 if (!capable(CAP_NET_ADMIN))
629                         break;
630                 err = register_vlan_device(dev, args.u.VID);
631                 break;
632
633         case DEL_VLAN_CMD:
634                 err = -EPERM;
635                 if (!capable(CAP_NET_ADMIN))
636                         break;
637                 unregister_vlan_dev(dev, NULL);
638                 err = 0;
639                 break;
640
641         case GET_VLAN_REALDEV_NAME_CMD:
642                 err = 0;
643                 vlan_dev_get_realdev_name(dev, args.u.device2);
644                 if (copy_to_user(arg, &args,
645                                  sizeof(struct vlan_ioctl_args)))
646                         err = -EFAULT;
647                 break;
648
649         case GET_VLAN_VID_CMD:
650                 err = 0;
651                 args.u.VID = vlan_dev_vlan_id(dev);
652                 if (copy_to_user(arg, &args,
653                                  sizeof(struct vlan_ioctl_args)))
654                       err = -EFAULT;
655                 break;
656
657         default:
658                 err = -EOPNOTSUPP;
659                 break;
660         }
661 out:
662         rtnl_unlock();
663         return err;
664 }
665
666 static int __net_init vlan_init_net(struct net *net)
667 {
668         struct vlan_net *vn = net_generic(net, vlan_net_id);
669         int err;
670
671         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
672
673         err = vlan_proc_init(net);
674
675         return err;
676 }
677
678 static void __net_exit vlan_exit_net(struct net *net)
679 {
680         vlan_proc_cleanup(net);
681 }
682
683 static struct pernet_operations vlan_net_ops = {
684         .init = vlan_init_net,
685         .exit = vlan_exit_net,
686         .id   = &vlan_net_id,
687         .size = sizeof(struct vlan_net),
688 };
689
690 static int __init vlan_proto_init(void)
691 {
692         int err;
693
694         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
695         pr_info("All bugs added by %s\n", vlan_buggyright);
696
697         err = register_pernet_subsys(&vlan_net_ops);
698         if (err < 0)
699                 goto err0;
700
701         err = register_netdevice_notifier(&vlan_notifier_block);
702         if (err < 0)
703                 goto err2;
704
705         err = vlan_gvrp_init();
706         if (err < 0)
707                 goto err3;
708
709         err = vlan_netlink_init();
710         if (err < 0)
711                 goto err4;
712
713         dev_add_pack(&vlan_packet_type);
714         vlan_ioctl_set(vlan_ioctl_handler);
715         return 0;
716
717 err4:
718         vlan_gvrp_uninit();
719 err3:
720         unregister_netdevice_notifier(&vlan_notifier_block);
721 err2:
722         unregister_pernet_subsys(&vlan_net_ops);
723 err0:
724         return err;
725 }
726
727 static void __exit vlan_cleanup_module(void)
728 {
729         unsigned int i;
730
731         vlan_ioctl_set(NULL);
732         vlan_netlink_fini();
733
734         unregister_netdevice_notifier(&vlan_notifier_block);
735
736         dev_remove_pack(&vlan_packet_type);
737
738         /* This table must be empty if there are no module references left. */
739         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
740                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
741
742         unregister_pernet_subsys(&vlan_net_ops);
743         rcu_barrier(); /* Wait for completion of call_rcu()'s */
744
745         vlan_gvrp_uninit();
746 }
747
748 module_init(vlan_proto_init);
749 module_exit(vlan_cleanup_module);
750
751 MODULE_LICENSE("GPL");
752 MODULE_VERSION(DRV_VERSION);