Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
[linux-2.6.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         vlandev->real_num_tx_queues = dev->real_num_tx_queues;
382         BUG_ON(vlandev->real_num_tx_queues > vlandev->num_tx_queues);
383
384         if (old_features != vlandev->features)
385                 netdev_features_change(vlandev);
386 }
387
388 static void __vlan_device_event(struct net_device *dev, unsigned long event)
389 {
390         switch (event) {
391         case NETDEV_CHANGENAME:
392                 vlan_proc_rem_dev(dev);
393                 if (vlan_proc_add_dev(dev) < 0)
394                         pr_warning("8021q: failed to change proc name for %s\n",
395                                         dev->name);
396                 break;
397         case NETDEV_REGISTER:
398                 if (vlan_proc_add_dev(dev) < 0)
399                         pr_warning("8021q: failed to add proc entry for %s\n",
400                                         dev->name);
401                 break;
402         case NETDEV_UNREGISTER:
403                 vlan_proc_rem_dev(dev);
404                 break;
405         }
406 }
407
408 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
409                              void *ptr)
410 {
411         struct net_device *dev = ptr;
412         struct vlan_group *grp;
413         int i, flgs;
414         struct net_device *vlandev;
415         struct vlan_dev_info *vlan;
416         LIST_HEAD(list);
417
418         if (is_vlan_dev(dev))
419                 __vlan_device_event(dev, event);
420
421         grp = __vlan_find_group(dev);
422         if (!grp)
423                 goto out;
424
425         /* It is OK that we do not hold the group lock right now,
426          * as we run under the RTNL lock.
427          */
428
429         switch (event) {
430         case NETDEV_CHANGE:
431                 /* Propagate real device state to vlan devices */
432                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
433                         vlandev = vlan_group_get_device(grp, i);
434                         if (!vlandev)
435                                 continue;
436
437                         netif_stacked_transfer_operstate(dev, vlandev);
438                 }
439                 break;
440
441         case NETDEV_CHANGEADDR:
442                 /* Adjust unicast filters on underlying device */
443                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
444                         vlandev = vlan_group_get_device(grp, i);
445                         if (!vlandev)
446                                 continue;
447
448                         flgs = vlandev->flags;
449                         if (!(flgs & IFF_UP))
450                                 continue;
451
452                         vlan_sync_address(dev, vlandev);
453                 }
454                 break;
455
456         case NETDEV_CHANGEMTU:
457                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
458                         vlandev = vlan_group_get_device(grp, i);
459                         if (!vlandev)
460                                 continue;
461
462                         if (vlandev->mtu <= dev->mtu)
463                                 continue;
464
465                         dev_set_mtu(vlandev, dev->mtu);
466                 }
467                 break;
468
469         case NETDEV_FEAT_CHANGE:
470                 /* Propagate device features to underlying device */
471                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
472                         vlandev = vlan_group_get_device(grp, i);
473                         if (!vlandev)
474                                 continue;
475
476                         vlan_transfer_features(dev, vlandev);
477                 }
478
479                 break;
480
481         case NETDEV_DOWN:
482                 /* Put all VLANs for this dev in the down state too.  */
483                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
484                         vlandev = vlan_group_get_device(grp, i);
485                         if (!vlandev)
486                                 continue;
487
488                         flgs = vlandev->flags;
489                         if (!(flgs & IFF_UP))
490                                 continue;
491
492                         vlan = vlan_dev_info(vlandev);
493                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
494                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
495                         netif_stacked_transfer_operstate(dev, vlandev);
496                 }
497                 break;
498
499         case NETDEV_UP:
500                 /* Put all VLANs for this dev in the up state too.  */
501                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
502                         vlandev = vlan_group_get_device(grp, i);
503                         if (!vlandev)
504                                 continue;
505
506                         flgs = vlandev->flags;
507                         if (flgs & IFF_UP)
508                                 continue;
509
510                         vlan = vlan_dev_info(vlandev);
511                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
512                                 dev_change_flags(vlandev, flgs | IFF_UP);
513                         netif_stacked_transfer_operstate(dev, vlandev);
514                 }
515                 break;
516
517         case NETDEV_UNREGISTER:
518                 /* Delete all VLANs for this dev. */
519                 grp->killall = 1;
520
521                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
522                         vlandev = vlan_group_get_device(grp, i);
523                         if (!vlandev)
524                                 continue;
525
526                         /* unregistration of last vlan destroys group, abort
527                          * afterwards */
528                         if (grp->nr_vlans == 1)
529                                 i = VLAN_GROUP_ARRAY_LEN;
530
531                         unregister_vlan_dev(vlandev, &list);
532                 }
533                 unregister_netdevice_many(&list);
534                 break;
535         }
536
537 out:
538         return NOTIFY_DONE;
539 }
540
541 static struct notifier_block vlan_notifier_block __read_mostly = {
542         .notifier_call = vlan_device_event,
543 };
544
545 /*
546  *      VLAN IOCTL handler.
547  *      o execute requested action or pass command to the device driver
548  *   arg is really a struct vlan_ioctl_args __user *.
549  */
550 static int vlan_ioctl_handler(struct net *net, void __user *arg)
551 {
552         int err;
553         struct vlan_ioctl_args args;
554         struct net_device *dev = NULL;
555
556         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
557                 return -EFAULT;
558
559         /* Null terminate this sucker, just in case. */
560         args.device1[23] = 0;
561         args.u.device2[23] = 0;
562
563         rtnl_lock();
564
565         switch (args.cmd) {
566         case SET_VLAN_INGRESS_PRIORITY_CMD:
567         case SET_VLAN_EGRESS_PRIORITY_CMD:
568         case SET_VLAN_FLAG_CMD:
569         case ADD_VLAN_CMD:
570         case DEL_VLAN_CMD:
571         case GET_VLAN_REALDEV_NAME_CMD:
572         case GET_VLAN_VID_CMD:
573                 err = -ENODEV;
574                 dev = __dev_get_by_name(net, args.device1);
575                 if (!dev)
576                         goto out;
577
578                 err = -EINVAL;
579                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
580                         goto out;
581         }
582
583         switch (args.cmd) {
584         case SET_VLAN_INGRESS_PRIORITY_CMD:
585                 err = -EPERM;
586                 if (!capable(CAP_NET_ADMIN))
587                         break;
588                 vlan_dev_set_ingress_priority(dev,
589                                               args.u.skb_priority,
590                                               args.vlan_qos);
591                 err = 0;
592                 break;
593
594         case SET_VLAN_EGRESS_PRIORITY_CMD:
595                 err = -EPERM;
596                 if (!capable(CAP_NET_ADMIN))
597                         break;
598                 err = vlan_dev_set_egress_priority(dev,
599                                                    args.u.skb_priority,
600                                                    args.vlan_qos);
601                 break;
602
603         case SET_VLAN_FLAG_CMD:
604                 err = -EPERM;
605                 if (!capable(CAP_NET_ADMIN))
606                         break;
607                 err = vlan_dev_change_flags(dev,
608                                             args.vlan_qos ? args.u.flag : 0,
609                                             args.u.flag);
610                 break;
611
612         case SET_VLAN_NAME_TYPE_CMD:
613                 err = -EPERM;
614                 if (!capable(CAP_NET_ADMIN))
615                         break;
616                 if ((args.u.name_type >= 0) &&
617                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
618                         struct vlan_net *vn;
619
620                         vn = net_generic(net, vlan_net_id);
621                         vn->name_type = args.u.name_type;
622                         err = 0;
623                 } else {
624                         err = -EINVAL;
625                 }
626                 break;
627
628         case ADD_VLAN_CMD:
629                 err = -EPERM;
630                 if (!capable(CAP_NET_ADMIN))
631                         break;
632                 err = register_vlan_device(dev, args.u.VID);
633                 break;
634
635         case DEL_VLAN_CMD:
636                 err = -EPERM;
637                 if (!capable(CAP_NET_ADMIN))
638                         break;
639                 unregister_vlan_dev(dev, NULL);
640                 err = 0;
641                 break;
642
643         case GET_VLAN_REALDEV_NAME_CMD:
644                 err = 0;
645                 vlan_dev_get_realdev_name(dev, args.u.device2);
646                 if (copy_to_user(arg, &args,
647                                  sizeof(struct vlan_ioctl_args)))
648                         err = -EFAULT;
649                 break;
650
651         case GET_VLAN_VID_CMD:
652                 err = 0;
653                 args.u.VID = vlan_dev_vlan_id(dev);
654                 if (copy_to_user(arg, &args,
655                                  sizeof(struct vlan_ioctl_args)))
656                       err = -EFAULT;
657                 break;
658
659         default:
660                 err = -EOPNOTSUPP;
661                 break;
662         }
663 out:
664         rtnl_unlock();
665         return err;
666 }
667
668 static int __net_init vlan_init_net(struct net *net)
669 {
670         struct vlan_net *vn = net_generic(net, vlan_net_id);
671         int err;
672
673         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
674
675         err = vlan_proc_init(net);
676
677         return err;
678 }
679
680 static void __net_exit vlan_exit_net(struct net *net)
681 {
682         vlan_proc_cleanup(net);
683 }
684
685 static struct pernet_operations vlan_net_ops = {
686         .init = vlan_init_net,
687         .exit = vlan_exit_net,
688         .id   = &vlan_net_id,
689         .size = sizeof(struct vlan_net),
690 };
691
692 static int __init vlan_proto_init(void)
693 {
694         int err;
695
696         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
697         pr_info("All bugs added by %s\n", vlan_buggyright);
698
699         err = register_pernet_subsys(&vlan_net_ops);
700         if (err < 0)
701                 goto err0;
702
703         err = register_netdevice_notifier(&vlan_notifier_block);
704         if (err < 0)
705                 goto err2;
706
707         err = vlan_gvrp_init();
708         if (err < 0)
709                 goto err3;
710
711         err = vlan_netlink_init();
712         if (err < 0)
713                 goto err4;
714
715         dev_add_pack(&vlan_packet_type);
716         vlan_ioctl_set(vlan_ioctl_handler);
717         return 0;
718
719 err4:
720         vlan_gvrp_uninit();
721 err3:
722         unregister_netdevice_notifier(&vlan_notifier_block);
723 err2:
724         unregister_pernet_subsys(&vlan_net_ops);
725 err0:
726         return err;
727 }
728
729 static void __exit vlan_cleanup_module(void)
730 {
731         unsigned int i;
732
733         vlan_ioctl_set(NULL);
734         vlan_netlink_fini();
735
736         unregister_netdevice_notifier(&vlan_notifier_block);
737
738         dev_remove_pack(&vlan_packet_type);
739
740         /* This table must be empty if there are no module references left. */
741         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
742                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
743
744         unregister_pernet_subsys(&vlan_net_ops);
745         rcu_barrier(); /* Wait for completion of call_rcu()'s */
746
747         vlan_gvrp_uninit();
748 }
749
750 module_init(vlan_proto_init);
751 module_exit(vlan_cleanup_module);
752
753 MODULE_LICENSE("GPL");
754 MODULE_VERSION(DRV_VERSION);