can: fix setting mcp251x bit timing on open
[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;
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 static void vlan_transfer_operstate(const struct net_device *dev,
188                                     struct net_device *vlandev)
189 {
190         /* Have to respect userspace enforced dormant state
191          * of real device, also must allow supplicant running
192          * on VLAN device
193          */
194         if (dev->operstate == IF_OPER_DORMANT)
195                 netif_dormant_on(vlandev);
196         else
197                 netif_dormant_off(vlandev);
198
199         if (netif_carrier_ok(dev)) {
200                 if (!netif_carrier_ok(vlandev))
201                         netif_carrier_on(vlandev);
202         } else {
203                 if (netif_carrier_ok(vlandev))
204                         netif_carrier_off(vlandev);
205         }
206 }
207
208 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
209 {
210         const char *name = real_dev->name;
211         const struct net_device_ops *ops = real_dev->netdev_ops;
212
213         if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
214                 pr_info("8021q: VLANs not supported on %s\n", name);
215                 return -EOPNOTSUPP;
216         }
217
218         if ((real_dev->features & NETIF_F_HW_VLAN_RX) && !ops->ndo_vlan_rx_register) {
219                 pr_info("8021q: device %s has buggy VLAN hw accel\n", name);
220                 return -EOPNOTSUPP;
221         }
222
223         if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
224             (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
225                 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
226                 return -EOPNOTSUPP;
227         }
228
229         if (__find_vlan_dev(real_dev, vlan_id) != NULL)
230                 return -EEXIST;
231
232         return 0;
233 }
234
235 int register_vlan_dev(struct net_device *dev)
236 {
237         struct vlan_dev_info *vlan = vlan_dev_info(dev);
238         struct net_device *real_dev = vlan->real_dev;
239         const struct net_device_ops *ops = real_dev->netdev_ops;
240         u16 vlan_id = vlan->vlan_id;
241         struct vlan_group *grp, *ngrp = NULL;
242         int err;
243
244         grp = __vlan_find_group(real_dev);
245         if (!grp) {
246                 ngrp = grp = vlan_group_alloc(real_dev);
247                 if (!grp)
248                         return -ENOBUFS;
249                 err = vlan_gvrp_init_applicant(real_dev);
250                 if (err < 0)
251                         goto out_free_group;
252         }
253
254         err = vlan_group_prealloc_vid(grp, vlan_id);
255         if (err < 0)
256                 goto out_uninit_applicant;
257
258         err = register_netdevice(dev);
259         if (err < 0)
260                 goto out_uninit_applicant;
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                 ops->ndo_vlan_rx_register(real_dev, ngrp);
276         if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
277                 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
278
279         return 0;
280
281 out_uninit_applicant:
282         if (ngrp)
283                 vlan_gvrp_uninit_applicant(real_dev);
284 out_free_group:
285         if (ngrp)
286                 vlan_group_free(ngrp);
287         return err;
288 }
289
290 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
291  *  Returns 0 if the device was created or a negative error code otherwise.
292  */
293 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
294 {
295         struct net_device *new_dev;
296         struct net *net = dev_net(real_dev);
297         struct vlan_net *vn = net_generic(net, vlan_net_id);
298         char name[IFNAMSIZ];
299         int err;
300
301         if (vlan_id >= VLAN_VID_MASK)
302                 return -ERANGE;
303
304         err = vlan_check_real_dev(real_dev, vlan_id);
305         if (err < 0)
306                 return err;
307
308         /* Gotta set up the fields for the device. */
309         switch (vn->name_type) {
310         case VLAN_NAME_TYPE_RAW_PLUS_VID:
311                 /* name will look like:  eth1.0005 */
312                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
313                 break;
314         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
315                 /* Put our vlan.VID in the name.
316                  * Name will look like:  vlan5
317                  */
318                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
319                 break;
320         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
321                 /* Put our vlan.VID in the name.
322                  * Name will look like:  eth0.5
323                  */
324                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
325                 break;
326         case VLAN_NAME_TYPE_PLUS_VID:
327                 /* Put our vlan.VID in the name.
328                  * Name will look like:  vlan0005
329                  */
330         default:
331                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
332         }
333
334         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
335                                   vlan_setup, real_dev->num_tx_queues);
336
337         if (new_dev == NULL)
338                 return -ENOBUFS;
339
340         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
341         dev_net_set(new_dev, net);
342         /* need 4 bytes for extra VLAN header info,
343          * hope the underlying device can handle it.
344          */
345         new_dev->mtu = real_dev->mtu;
346
347         vlan_dev_info(new_dev)->vlan_id = vlan_id;
348         vlan_dev_info(new_dev)->real_dev = real_dev;
349         vlan_dev_info(new_dev)->dent = NULL;
350         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
351
352         new_dev->rtnl_link_ops = &vlan_link_ops;
353         err = register_vlan_dev(new_dev);
354         if (err < 0)
355                 goto out_free_newdev;
356
357         return 0;
358
359 out_free_newdev:
360         free_netdev(new_dev);
361         return err;
362 }
363
364 static void vlan_sync_address(struct net_device *dev,
365                               struct net_device *vlandev)
366 {
367         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
368
369         /* May be called without an actual change */
370         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
371                 return;
372
373         /* vlan address was different from the old address and is equal to
374          * the new address */
375         if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
376             !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
377                 dev_unicast_delete(dev, vlandev->dev_addr);
378
379         /* vlan address was equal to the old address and is different from
380          * the new address */
381         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
382             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
383                 dev_unicast_add(dev, vlandev->dev_addr);
384
385         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
386 }
387
388 static void vlan_transfer_features(struct net_device *dev,
389                                    struct net_device *vlandev)
390 {
391         unsigned long old_features = vlandev->features;
392
393         vlandev->features &= ~dev->vlan_features;
394         vlandev->features |= dev->features & dev->vlan_features;
395         vlandev->gso_max_size = dev->gso_max_size;
396 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
397         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
398 #endif
399
400         if (old_features != vlandev->features)
401                 netdev_features_change(vlandev);
402 }
403
404 static void __vlan_device_event(struct net_device *dev, unsigned long event)
405 {
406         switch (event) {
407         case NETDEV_CHANGENAME:
408                 vlan_proc_rem_dev(dev);
409                 if (vlan_proc_add_dev(dev) < 0)
410                         pr_warning("8021q: failed to change proc name for %s\n",
411                                         dev->name);
412                 break;
413         case NETDEV_REGISTER:
414                 if (vlan_proc_add_dev(dev) < 0)
415                         pr_warning("8021q: failed to add proc entry for %s\n",
416                                         dev->name);
417                 break;
418         case NETDEV_UNREGISTER:
419                 vlan_proc_rem_dev(dev);
420                 break;
421         }
422 }
423
424 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
425                              void *ptr)
426 {
427         struct net_device *dev = ptr;
428         struct vlan_group *grp;
429         int i, flgs;
430         struct net_device *vlandev;
431         LIST_HEAD(list);
432
433         if (is_vlan_dev(dev))
434                 __vlan_device_event(dev, event);
435
436         grp = __vlan_find_group(dev);
437         if (!grp)
438                 goto out;
439
440         /* It is OK that we do not hold the group lock right now,
441          * as we run under the RTNL lock.
442          */
443
444         switch (event) {
445         case NETDEV_CHANGE:
446                 /* Propagate real device state to vlan devices */
447                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
448                         vlandev = vlan_group_get_device(grp, i);
449                         if (!vlandev)
450                                 continue;
451
452                         vlan_transfer_operstate(dev, vlandev);
453                 }
454                 break;
455
456         case NETDEV_CHANGEADDR:
457                 /* Adjust unicast filters on underlying device */
458                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
459                         vlandev = vlan_group_get_device(grp, i);
460                         if (!vlandev)
461                                 continue;
462
463                         flgs = vlandev->flags;
464                         if (!(flgs & IFF_UP))
465                                 continue;
466
467                         vlan_sync_address(dev, vlandev);
468                 }
469                 break;
470
471         case NETDEV_CHANGEMTU:
472                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
473                         vlandev = vlan_group_get_device(grp, i);
474                         if (!vlandev)
475                                 continue;
476
477                         if (vlandev->mtu <= dev->mtu)
478                                 continue;
479
480                         dev_set_mtu(vlandev, dev->mtu);
481                 }
482                 break;
483
484         case NETDEV_FEAT_CHANGE:
485                 /* Propagate device features to underlying device */
486                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
487                         vlandev = vlan_group_get_device(grp, i);
488                         if (!vlandev)
489                                 continue;
490
491                         vlan_transfer_features(dev, vlandev);
492                 }
493
494                 break;
495
496         case NETDEV_DOWN:
497                 /* Put all VLANs for this dev in the down state too.  */
498                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
499                         vlandev = vlan_group_get_device(grp, i);
500                         if (!vlandev)
501                                 continue;
502
503                         flgs = vlandev->flags;
504                         if (!(flgs & IFF_UP))
505                                 continue;
506
507                         dev_change_flags(vlandev, flgs & ~IFF_UP);
508                         vlan_transfer_operstate(dev, vlandev);
509                 }
510                 break;
511
512         case NETDEV_UP:
513                 /* Put all VLANs for this dev in the up state too.  */
514                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
515                         vlandev = vlan_group_get_device(grp, i);
516                         if (!vlandev)
517                                 continue;
518
519                         flgs = vlandev->flags;
520                         if (flgs & IFF_UP)
521                                 continue;
522
523                         dev_change_flags(vlandev, flgs | IFF_UP);
524                         vlan_transfer_operstate(dev, vlandev);
525                 }
526                 break;
527
528         case NETDEV_UNREGISTER:
529                 /* Delete all VLANs for this dev. */
530                 grp->killall = 1;
531
532                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
533                         vlandev = vlan_group_get_device(grp, i);
534                         if (!vlandev)
535                                 continue;
536
537                         /* unregistration of last vlan destroys group, abort
538                          * afterwards */
539                         if (grp->nr_vlans == 1)
540                                 i = VLAN_GROUP_ARRAY_LEN;
541
542                         unregister_vlan_dev(vlandev, &list);
543                 }
544                 unregister_netdevice_many(&list);
545                 break;
546         }
547
548 out:
549         return NOTIFY_DONE;
550 }
551
552 static struct notifier_block vlan_notifier_block __read_mostly = {
553         .notifier_call = vlan_device_event,
554 };
555
556 /*
557  *      VLAN IOCTL handler.
558  *      o execute requested action or pass command to the device driver
559  *   arg is really a struct vlan_ioctl_args __user *.
560  */
561 static int vlan_ioctl_handler(struct net *net, void __user *arg)
562 {
563         int err;
564         struct vlan_ioctl_args args;
565         struct net_device *dev = NULL;
566
567         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
568                 return -EFAULT;
569
570         /* Null terminate this sucker, just in case. */
571         args.device1[23] = 0;
572         args.u.device2[23] = 0;
573
574         rtnl_lock();
575
576         switch (args.cmd) {
577         case SET_VLAN_INGRESS_PRIORITY_CMD:
578         case SET_VLAN_EGRESS_PRIORITY_CMD:
579         case SET_VLAN_FLAG_CMD:
580         case ADD_VLAN_CMD:
581         case DEL_VLAN_CMD:
582         case GET_VLAN_REALDEV_NAME_CMD:
583         case GET_VLAN_VID_CMD:
584                 err = -ENODEV;
585                 dev = __dev_get_by_name(net, args.device1);
586                 if (!dev)
587                         goto out;
588
589                 err = -EINVAL;
590                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
591                         goto out;
592         }
593
594         switch (args.cmd) {
595         case SET_VLAN_INGRESS_PRIORITY_CMD:
596                 err = -EPERM;
597                 if (!capable(CAP_NET_ADMIN))
598                         break;
599                 vlan_dev_set_ingress_priority(dev,
600                                               args.u.skb_priority,
601                                               args.vlan_qos);
602                 err = 0;
603                 break;
604
605         case SET_VLAN_EGRESS_PRIORITY_CMD:
606                 err = -EPERM;
607                 if (!capable(CAP_NET_ADMIN))
608                         break;
609                 err = vlan_dev_set_egress_priority(dev,
610                                                    args.u.skb_priority,
611                                                    args.vlan_qos);
612                 break;
613
614         case SET_VLAN_FLAG_CMD:
615                 err = -EPERM;
616                 if (!capable(CAP_NET_ADMIN))
617                         break;
618                 err = vlan_dev_change_flags(dev,
619                                             args.vlan_qos ? args.u.flag : 0,
620                                             args.u.flag);
621                 break;
622
623         case SET_VLAN_NAME_TYPE_CMD:
624                 err = -EPERM;
625                 if (!capable(CAP_NET_ADMIN))
626                         break;
627                 if ((args.u.name_type >= 0) &&
628                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
629                         struct vlan_net *vn;
630
631                         vn = net_generic(net, vlan_net_id);
632                         vn->name_type = args.u.name_type;
633                         err = 0;
634                 } else {
635                         err = -EINVAL;
636                 }
637                 break;
638
639         case ADD_VLAN_CMD:
640                 err = -EPERM;
641                 if (!capable(CAP_NET_ADMIN))
642                         break;
643                 err = register_vlan_device(dev, args.u.VID);
644                 break;
645
646         case DEL_VLAN_CMD:
647                 err = -EPERM;
648                 if (!capable(CAP_NET_ADMIN))
649                         break;
650                 unregister_vlan_dev(dev, NULL);
651                 err = 0;
652                 break;
653
654         case GET_VLAN_REALDEV_NAME_CMD:
655                 err = 0;
656                 vlan_dev_get_realdev_name(dev, args.u.device2);
657                 if (copy_to_user(arg, &args,
658                                  sizeof(struct vlan_ioctl_args)))
659                         err = -EFAULT;
660                 break;
661
662         case GET_VLAN_VID_CMD:
663                 err = 0;
664                 args.u.VID = vlan_dev_vlan_id(dev);
665                 if (copy_to_user(arg, &args,
666                                  sizeof(struct vlan_ioctl_args)))
667                       err = -EFAULT;
668                 break;
669
670         default:
671                 err = -EOPNOTSUPP;
672                 break;
673         }
674 out:
675         rtnl_unlock();
676         return err;
677 }
678
679 static int vlan_init_net(struct net *net)
680 {
681         int err;
682         struct vlan_net *vn;
683
684         err = -ENOMEM;
685         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
686         if (vn == NULL)
687                 goto err_alloc;
688
689         err = net_assign_generic(net, vlan_net_id, vn);
690         if (err < 0)
691                 goto err_assign;
692
693         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
694
695         err = vlan_proc_init(net);
696         if (err < 0)
697                 goto err_proc;
698
699         return 0;
700
701 err_proc:
702         /* nothing */
703 err_assign:
704         kfree(vn);
705 err_alloc:
706         return err;
707 }
708
709 static void vlan_exit_net(struct net *net)
710 {
711         struct vlan_net *vn;
712
713         vn = net_generic(net, vlan_net_id);
714         rtnl_kill_links(net, &vlan_link_ops);
715         vlan_proc_cleanup(net);
716         kfree(vn);
717 }
718
719 static struct pernet_operations vlan_net_ops = {
720         .init = vlan_init_net,
721         .exit = vlan_exit_net,
722 };
723
724 static int __init vlan_proto_init(void)
725 {
726         int err;
727
728         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
729         pr_info("All bugs added by %s\n", vlan_buggyright);
730
731         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
732         if (err < 0)
733                 goto err0;
734
735         err = register_netdevice_notifier(&vlan_notifier_block);
736         if (err < 0)
737                 goto err2;
738
739         err = vlan_gvrp_init();
740         if (err < 0)
741                 goto err3;
742
743         err = vlan_netlink_init();
744         if (err < 0)
745                 goto err4;
746
747         dev_add_pack(&vlan_packet_type);
748         vlan_ioctl_set(vlan_ioctl_handler);
749         return 0;
750
751 err4:
752         vlan_gvrp_uninit();
753 err3:
754         unregister_netdevice_notifier(&vlan_notifier_block);
755 err2:
756         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
757 err0:
758         return err;
759 }
760
761 static void __exit vlan_cleanup_module(void)
762 {
763         unsigned int i;
764
765         vlan_ioctl_set(NULL);
766         vlan_netlink_fini();
767
768         unregister_netdevice_notifier(&vlan_notifier_block);
769
770         dev_remove_pack(&vlan_packet_type);
771
772         /* This table must be empty if there are no module references left. */
773         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
774                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
775
776         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
777         rcu_barrier(); /* Wait for completion of call_rcu()'s */
778
779         vlan_gvrp_uninit();
780 }
781
782 module_init(vlan_proto_init);
783 module_exit(vlan_cleanup_module);
784
785 MODULE_LICENSE("GPL");
786 MODULE_VERSION(DRV_VERSION);