vlan: support "loose binding" to the underlying network device
[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 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                 hlist_del_rcu(&ngrp->hlist);
287                 /* Free the group, after all cpu's are done. */
288                 call_rcu(&ngrp->rcu, vlan_rcu_free);
289         }
290         return err;
291 }
292
293 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
294  *  Returns 0 if the device was created or a negative error code otherwise.
295  */
296 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
297 {
298         struct net_device *new_dev;
299         struct net *net = dev_net(real_dev);
300         struct vlan_net *vn = net_generic(net, vlan_net_id);
301         char name[IFNAMSIZ];
302         int err;
303
304         if (vlan_id >= VLAN_VID_MASK)
305                 return -ERANGE;
306
307         err = vlan_check_real_dev(real_dev, vlan_id);
308         if (err < 0)
309                 return err;
310
311         /* Gotta set up the fields for the device. */
312         switch (vn->name_type) {
313         case VLAN_NAME_TYPE_RAW_PLUS_VID:
314                 /* name will look like:  eth1.0005 */
315                 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
316                 break;
317         case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
318                 /* Put our vlan.VID in the name.
319                  * Name will look like:  vlan5
320                  */
321                 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
322                 break;
323         case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
324                 /* Put our vlan.VID in the name.
325                  * Name will look like:  eth0.5
326                  */
327                 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
328                 break;
329         case VLAN_NAME_TYPE_PLUS_VID:
330                 /* Put our vlan.VID in the name.
331                  * Name will look like:  vlan0005
332                  */
333         default:
334                 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
335         }
336
337         new_dev = alloc_netdev_mq(sizeof(struct vlan_dev_info), name,
338                                   vlan_setup, real_dev->num_tx_queues);
339
340         if (new_dev == NULL)
341                 return -ENOBUFS;
342
343         new_dev->real_num_tx_queues = real_dev->real_num_tx_queues;
344         dev_net_set(new_dev, net);
345         /* need 4 bytes for extra VLAN header info,
346          * hope the underlying device can handle it.
347          */
348         new_dev->mtu = real_dev->mtu;
349
350         vlan_dev_info(new_dev)->vlan_id = vlan_id;
351         vlan_dev_info(new_dev)->real_dev = real_dev;
352         vlan_dev_info(new_dev)->dent = NULL;
353         vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
354
355         new_dev->rtnl_link_ops = &vlan_link_ops;
356         err = register_vlan_dev(new_dev);
357         if (err < 0)
358                 goto out_free_newdev;
359
360         return 0;
361
362 out_free_newdev:
363         free_netdev(new_dev);
364         return err;
365 }
366
367 static void vlan_sync_address(struct net_device *dev,
368                               struct net_device *vlandev)
369 {
370         struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
371
372         /* May be called without an actual change */
373         if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
374                 return;
375
376         /* vlan address was different from the old address and is equal to
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_delete(dev, vlandev->dev_addr);
381
382         /* vlan address was equal to the old address and is different from
383          * the new address */
384         if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
385             compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
386                 dev_unicast_add(dev, vlandev->dev_addr);
387
388         memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
389 }
390
391 static void vlan_transfer_features(struct net_device *dev,
392                                    struct net_device *vlandev)
393 {
394         unsigned long old_features = vlandev->features;
395
396         vlandev->features &= ~dev->vlan_features;
397         vlandev->features |= dev->features & dev->vlan_features;
398         vlandev->gso_max_size = dev->gso_max_size;
399 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
400         vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
401 #endif
402
403         if (old_features != vlandev->features)
404                 netdev_features_change(vlandev);
405 }
406
407 static void __vlan_device_event(struct net_device *dev, unsigned long event)
408 {
409         switch (event) {
410         case NETDEV_CHANGENAME:
411                 vlan_proc_rem_dev(dev);
412                 if (vlan_proc_add_dev(dev) < 0)
413                         pr_warning("8021q: failed to change proc name for %s\n",
414                                         dev->name);
415                 break;
416         case NETDEV_REGISTER:
417                 if (vlan_proc_add_dev(dev) < 0)
418                         pr_warning("8021q: failed to add proc entry for %s\n",
419                                         dev->name);
420                 break;
421         case NETDEV_UNREGISTER:
422                 vlan_proc_rem_dev(dev);
423                 break;
424         }
425 }
426
427 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
428                              void *ptr)
429 {
430         struct net_device *dev = ptr;
431         struct vlan_group *grp;
432         int i, flgs;
433         struct net_device *vlandev;
434         struct vlan_dev_info *vlan;
435         LIST_HEAD(list);
436
437         if (is_vlan_dev(dev))
438                 __vlan_device_event(dev, event);
439
440         grp = __vlan_find_group(dev);
441         if (!grp)
442                 goto out;
443
444         /* It is OK that we do not hold the group lock right now,
445          * as we run under the RTNL lock.
446          */
447
448         switch (event) {
449         case NETDEV_CHANGE:
450                 /* Propagate real device state to vlan devices */
451                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
452                         vlandev = vlan_group_get_device(grp, i);
453                         if (!vlandev)
454                                 continue;
455
456                         vlan_transfer_operstate(dev, vlandev);
457                 }
458                 break;
459
460         case NETDEV_CHANGEADDR:
461                 /* Adjust unicast filters on underlying device */
462                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
463                         vlandev = vlan_group_get_device(grp, i);
464                         if (!vlandev)
465                                 continue;
466
467                         flgs = vlandev->flags;
468                         if (!(flgs & IFF_UP))
469                                 continue;
470
471                         vlan_sync_address(dev, vlandev);
472                 }
473                 break;
474
475         case NETDEV_CHANGEMTU:
476                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
477                         vlandev = vlan_group_get_device(grp, i);
478                         if (!vlandev)
479                                 continue;
480
481                         if (vlandev->mtu <= dev->mtu)
482                                 continue;
483
484                         dev_set_mtu(vlandev, dev->mtu);
485                 }
486                 break;
487
488         case NETDEV_FEAT_CHANGE:
489                 /* Propagate device features to underlying device */
490                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
491                         vlandev = vlan_group_get_device(grp, i);
492                         if (!vlandev)
493                                 continue;
494
495                         vlan_transfer_features(dev, vlandev);
496                 }
497
498                 break;
499
500         case NETDEV_DOWN:
501                 /* Put all VLANs for this dev in the down state too.  */
502                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
503                         vlandev = vlan_group_get_device(grp, i);
504                         if (!vlandev)
505                                 continue;
506
507                         flgs = vlandev->flags;
508                         if (!(flgs & IFF_UP))
509                                 continue;
510
511                         vlan = vlan_dev_info(vlandev);
512                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
513                                 dev_change_flags(vlandev, flgs & ~IFF_UP);
514                         vlan_transfer_operstate(dev, vlandev);
515                 }
516                 break;
517
518         case NETDEV_UP:
519                 /* Put all VLANs for this dev in the up state too.  */
520                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
521                         vlandev = vlan_group_get_device(grp, i);
522                         if (!vlandev)
523                                 continue;
524
525                         flgs = vlandev->flags;
526                         if (flgs & IFF_UP)
527                                 continue;
528
529                         vlan = vlan_dev_info(vlandev);
530                         if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
531                                 dev_change_flags(vlandev, flgs | IFF_UP);
532                         vlan_transfer_operstate(dev, vlandev);
533                 }
534                 break;
535
536         case NETDEV_UNREGISTER:
537                 /* Delete all VLANs for this dev. */
538                 grp->killall = 1;
539
540                 for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
541                         vlandev = vlan_group_get_device(grp, i);
542                         if (!vlandev)
543                                 continue;
544
545                         /* unregistration of last vlan destroys group, abort
546                          * afterwards */
547                         if (grp->nr_vlans == 1)
548                                 i = VLAN_GROUP_ARRAY_LEN;
549
550                         unregister_vlan_dev(vlandev, &list);
551                 }
552                 unregister_netdevice_many(&list);
553                 break;
554         }
555
556 out:
557         return NOTIFY_DONE;
558 }
559
560 static struct notifier_block vlan_notifier_block __read_mostly = {
561         .notifier_call = vlan_device_event,
562 };
563
564 /*
565  *      VLAN IOCTL handler.
566  *      o execute requested action or pass command to the device driver
567  *   arg is really a struct vlan_ioctl_args __user *.
568  */
569 static int vlan_ioctl_handler(struct net *net, void __user *arg)
570 {
571         int err;
572         struct vlan_ioctl_args args;
573         struct net_device *dev = NULL;
574
575         if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
576                 return -EFAULT;
577
578         /* Null terminate this sucker, just in case. */
579         args.device1[23] = 0;
580         args.u.device2[23] = 0;
581
582         rtnl_lock();
583
584         switch (args.cmd) {
585         case SET_VLAN_INGRESS_PRIORITY_CMD:
586         case SET_VLAN_EGRESS_PRIORITY_CMD:
587         case SET_VLAN_FLAG_CMD:
588         case ADD_VLAN_CMD:
589         case DEL_VLAN_CMD:
590         case GET_VLAN_REALDEV_NAME_CMD:
591         case GET_VLAN_VID_CMD:
592                 err = -ENODEV;
593                 dev = __dev_get_by_name(net, args.device1);
594                 if (!dev)
595                         goto out;
596
597                 err = -EINVAL;
598                 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
599                         goto out;
600         }
601
602         switch (args.cmd) {
603         case SET_VLAN_INGRESS_PRIORITY_CMD:
604                 err = -EPERM;
605                 if (!capable(CAP_NET_ADMIN))
606                         break;
607                 vlan_dev_set_ingress_priority(dev,
608                                               args.u.skb_priority,
609                                               args.vlan_qos);
610                 err = 0;
611                 break;
612
613         case SET_VLAN_EGRESS_PRIORITY_CMD:
614                 err = -EPERM;
615                 if (!capable(CAP_NET_ADMIN))
616                         break;
617                 err = vlan_dev_set_egress_priority(dev,
618                                                    args.u.skb_priority,
619                                                    args.vlan_qos);
620                 break;
621
622         case SET_VLAN_FLAG_CMD:
623                 err = -EPERM;
624                 if (!capable(CAP_NET_ADMIN))
625                         break;
626                 err = vlan_dev_change_flags(dev,
627                                             args.vlan_qos ? args.u.flag : 0,
628                                             args.u.flag);
629                 break;
630
631         case SET_VLAN_NAME_TYPE_CMD:
632                 err = -EPERM;
633                 if (!capable(CAP_NET_ADMIN))
634                         break;
635                 if ((args.u.name_type >= 0) &&
636                     (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
637                         struct vlan_net *vn;
638
639                         vn = net_generic(net, vlan_net_id);
640                         vn->name_type = args.u.name_type;
641                         err = 0;
642                 } else {
643                         err = -EINVAL;
644                 }
645                 break;
646
647         case ADD_VLAN_CMD:
648                 err = -EPERM;
649                 if (!capable(CAP_NET_ADMIN))
650                         break;
651                 err = register_vlan_device(dev, args.u.VID);
652                 break;
653
654         case DEL_VLAN_CMD:
655                 err = -EPERM;
656                 if (!capable(CAP_NET_ADMIN))
657                         break;
658                 unregister_vlan_dev(dev, NULL);
659                 err = 0;
660                 break;
661
662         case GET_VLAN_REALDEV_NAME_CMD:
663                 err = 0;
664                 vlan_dev_get_realdev_name(dev, args.u.device2);
665                 if (copy_to_user(arg, &args,
666                                  sizeof(struct vlan_ioctl_args)))
667                         err = -EFAULT;
668                 break;
669
670         case GET_VLAN_VID_CMD:
671                 err = 0;
672                 args.u.VID = vlan_dev_vlan_id(dev);
673                 if (copy_to_user(arg, &args,
674                                  sizeof(struct vlan_ioctl_args)))
675                       err = -EFAULT;
676                 break;
677
678         default:
679                 err = -EOPNOTSUPP;
680                 break;
681         }
682 out:
683         rtnl_unlock();
684         return err;
685 }
686
687 static int vlan_init_net(struct net *net)
688 {
689         int err;
690         struct vlan_net *vn;
691
692         err = -ENOMEM;
693         vn = kzalloc(sizeof(struct vlan_net), GFP_KERNEL);
694         if (vn == NULL)
695                 goto err_alloc;
696
697         err = net_assign_generic(net, vlan_net_id, vn);
698         if (err < 0)
699                 goto err_assign;
700
701         vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
702
703         err = vlan_proc_init(net);
704         if (err < 0)
705                 goto err_proc;
706
707         return 0;
708
709 err_proc:
710         /* nothing */
711 err_assign:
712         kfree(vn);
713 err_alloc:
714         return err;
715 }
716
717 static void vlan_exit_net(struct net *net)
718 {
719         struct vlan_net *vn;
720
721         vn = net_generic(net, vlan_net_id);
722         rtnl_kill_links(net, &vlan_link_ops);
723         vlan_proc_cleanup(net);
724         kfree(vn);
725 }
726
727 static struct pernet_operations vlan_net_ops = {
728         .init = vlan_init_net,
729         .exit = vlan_exit_net,
730 };
731
732 static int __init vlan_proto_init(void)
733 {
734         int err;
735
736         pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
737         pr_info("All bugs added by %s\n", vlan_buggyright);
738
739         err = register_pernet_gen_device(&vlan_net_id, &vlan_net_ops);
740         if (err < 0)
741                 goto err0;
742
743         err = register_netdevice_notifier(&vlan_notifier_block);
744         if (err < 0)
745                 goto err2;
746
747         err = vlan_gvrp_init();
748         if (err < 0)
749                 goto err3;
750
751         err = vlan_netlink_init();
752         if (err < 0)
753                 goto err4;
754
755         dev_add_pack(&vlan_packet_type);
756         vlan_ioctl_set(vlan_ioctl_handler);
757         return 0;
758
759 err4:
760         vlan_gvrp_uninit();
761 err3:
762         unregister_netdevice_notifier(&vlan_notifier_block);
763 err2:
764         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
765 err0:
766         return err;
767 }
768
769 static void __exit vlan_cleanup_module(void)
770 {
771         unsigned int i;
772
773         vlan_ioctl_set(NULL);
774         vlan_netlink_fini();
775
776         unregister_netdevice_notifier(&vlan_notifier_block);
777
778         dev_remove_pack(&vlan_packet_type);
779
780         /* This table must be empty if there are no module references left. */
781         for (i = 0; i < VLAN_GRP_HASH_SIZE; i++)
782                 BUG_ON(!hlist_empty(&vlan_group_hash[i]));
783
784         unregister_pernet_gen_device(vlan_net_id, &vlan_net_ops);
785         rcu_barrier(); /* Wait for completion of call_rcu()'s */
786
787         vlan_gvrp_uninit();
788 }
789
790 module_init(vlan_proto_init);
791 module_exit(vlan_cleanup_module);
792
793 MODULE_LICENSE("GPL");
794 MODULE_VERSION(DRV_VERSION);