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/slab.h>
26 #include <linux/init.h>
27 #include <linux/rculist.h>
28 #include <net/p8022.h>
29 #include <net/arp.h>
30 #include <linux/rtnetlink.h>
31 #include <linux/notifier.h>
32 #include <net/rtnetlink.h>
33 #include <net/net_namespace.h>
34 #include <net/netns/generic.h>
35 #include <asm/uaccess.h>
36
37 #include <linux/if_vlan.h>
38 #include "vlan.h"
39 #include "vlanproc.h"
40
41 #define DRV_VERSION "1.8"
42
43 /* Global VLAN variables */
44
45 int vlan_net_id __read_mostly;
46
47 const char vlan_fullname[] = "802.1Q VLAN Support";
48 const char vlan_version[] = DRV_VERSION;
49 static const char vlan_copyright[] = "Ben Greear <greearb@candelatech.com>";
50 static const char vlan_buggyright[] = "David S. Miller <davem@redhat.com>";
51
52 static struct packet_type vlan_packet_type __read_mostly = {
53 .type = cpu_to_be16(ETH_P_8021Q),
54 .func = vlan_skb_recv, /* VLAN receive method */
55 };
56
57 /* End of global variables definitions. */
58
vlan_group_free(struct vlan_group * grp)59 static void vlan_group_free(struct vlan_group *grp)
60 {
61 int i;
62
63 for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
64 kfree(grp->vlan_devices_arrays[i]);
65 kfree(grp);
66 }
67
vlan_group_alloc(struct net_device * real_dev)68 static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
69 {
70 struct vlan_group *grp;
71
72 grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
73 if (!grp)
74 return NULL;
75
76 grp->real_dev = real_dev;
77 return grp;
78 }
79
vlan_group_prealloc_vid(struct vlan_group * vg,u16 vlan_id)80 static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
81 {
82 struct net_device **array;
83 unsigned int size;
84
85 ASSERT_RTNL();
86
87 array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
88 if (array != NULL)
89 return 0;
90
91 size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
92 array = kzalloc(size, GFP_KERNEL);
93 if (array == NULL)
94 return -ENOBUFS;
95
96 vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
97 return 0;
98 }
99
vlan_rcu_free(struct rcu_head * rcu)100 static void vlan_rcu_free(struct rcu_head *rcu)
101 {
102 vlan_group_free(container_of(rcu, struct vlan_group, rcu));
103 }
104
unregister_vlan_dev(struct net_device * dev,struct list_head * head)105 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
106 {
107 struct vlan_dev_info *vlan = vlan_dev_info(dev);
108 struct net_device *real_dev = vlan->real_dev;
109 const struct net_device_ops *ops = real_dev->netdev_ops;
110 struct vlan_group *grp;
111 u16 vlan_id = vlan->vlan_id;
112
113 ASSERT_RTNL();
114
115 grp = rtnl_dereference(real_dev->vlgrp);
116 BUG_ON(!grp);
117
118 /* Take it out of our own structures, but be sure to interlock with
119 * HW accelerating devices or SW vlan input packet processing if
120 * VLAN is not 0 (leave it there for 802.1p).
121 */
122 if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
123 ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
124
125 grp->nr_vlans--;
126
127 if (vlan->flags & VLAN_FLAG_GVRP)
128 vlan_gvrp_request_leave(dev);
129
130 vlan_group_set_device(grp, vlan_id, NULL);
131 if (!grp->killall)
132 synchronize_net();
133
134 unregister_netdevice_queue(dev, head);
135
136 /* If the group is now empty, kill off the group. */
137 if (grp->nr_vlans == 0) {
138 vlan_gvrp_uninit_applicant(real_dev);
139
140 rcu_assign_pointer(real_dev->vlgrp, NULL);
141 if (ops->ndo_vlan_rx_register)
142 ops->ndo_vlan_rx_register(real_dev, NULL);
143
144 /* Free the group, after all cpu's are done. */
145 call_rcu(&grp->rcu, vlan_rcu_free);
146 }
147
148 /* Get rid of the vlan's reference to real_dev */
149 dev_put(real_dev);
150 }
151
vlan_check_real_dev(struct net_device * real_dev,u16 vlan_id)152 int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
153 {
154 const char *name = real_dev->name;
155 const struct net_device_ops *ops = real_dev->netdev_ops;
156
157 if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
158 pr_info("8021q: VLANs not supported on %s\n", name);
159 return -EOPNOTSUPP;
160 }
161
162 if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
163 (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
164 pr_info("8021q: Device %s has buggy VLAN hw accel\n", name);
165 return -EOPNOTSUPP;
166 }
167
168 if (vlan_find_dev(real_dev, vlan_id) != NULL)
169 return -EEXIST;
170
171 return 0;
172 }
173
register_vlan_dev(struct net_device * dev)174 int register_vlan_dev(struct net_device *dev)
175 {
176 struct vlan_dev_info *vlan = vlan_dev_info(dev);
177 struct net_device *real_dev = vlan->real_dev;
178 const struct net_device_ops *ops = real_dev->netdev_ops;
179 u16 vlan_id = vlan->vlan_id;
180 struct vlan_group *grp, *ngrp = NULL;
181 int err;
182
183 grp = rtnl_dereference(real_dev->vlgrp);
184 if (!grp) {
185 ngrp = grp = vlan_group_alloc(real_dev);
186 if (!grp)
187 return -ENOBUFS;
188 err = vlan_gvrp_init_applicant(real_dev);
189 if (err < 0)
190 goto out_free_group;
191 }
192
193 err = vlan_group_prealloc_vid(grp, vlan_id);
194 if (err < 0)
195 goto out_uninit_applicant;
196
197 err = register_netdevice(dev);
198 if (err < 0)
199 goto out_uninit_applicant;
200
201 /* Account for reference in struct vlan_dev_info */
202 dev_hold(real_dev);
203
204 netif_stacked_transfer_operstate(real_dev, dev);
205 linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
206
207 /* So, got the sucker initialized, now lets place
208 * it into our local structure.
209 */
210 vlan_group_set_device(grp, vlan_id, dev);
211 grp->nr_vlans++;
212
213 if (ngrp) {
214 if (ops->ndo_vlan_rx_register)
215 ops->ndo_vlan_rx_register(real_dev, ngrp);
216 rcu_assign_pointer(real_dev->vlgrp, ngrp);
217 }
218 if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
219 ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
220
221 return 0;
222
223 out_uninit_applicant:
224 if (ngrp)
225 vlan_gvrp_uninit_applicant(real_dev);
226 out_free_group:
227 if (ngrp) {
228 /* Free the group, after all cpu's are done. */
229 call_rcu(&ngrp->rcu, vlan_rcu_free);
230 }
231 return err;
232 }
233
234 /* Attach a VLAN device to a mac address (ie Ethernet Card).
235 * Returns 0 if the device was created or a negative error code otherwise.
236 */
register_vlan_device(struct net_device * real_dev,u16 vlan_id)237 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
238 {
239 struct net_device *new_dev;
240 struct net *net = dev_net(real_dev);
241 struct vlan_net *vn = net_generic(net, vlan_net_id);
242 char name[IFNAMSIZ];
243 int err;
244
245 if (vlan_id >= VLAN_VID_MASK)
246 return -ERANGE;
247
248 err = vlan_check_real_dev(real_dev, vlan_id);
249 if (err < 0)
250 return err;
251
252 /* Gotta set up the fields for the device. */
253 switch (vn->name_type) {
254 case VLAN_NAME_TYPE_RAW_PLUS_VID:
255 /* name will look like: eth1.0005 */
256 snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
257 break;
258 case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
259 /* Put our vlan.VID in the name.
260 * Name will look like: vlan5
261 */
262 snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
263 break;
264 case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
265 /* Put our vlan.VID in the name.
266 * Name will look like: eth0.5
267 */
268 snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
269 break;
270 case VLAN_NAME_TYPE_PLUS_VID:
271 /* Put our vlan.VID in the name.
272 * Name will look like: vlan0005
273 */
274 default:
275 snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
276 }
277
278 new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
279
280 if (new_dev == NULL)
281 return -ENOBUFS;
282
283 dev_net_set(new_dev, net);
284 /* need 4 bytes for extra VLAN header info,
285 * hope the underlying device can handle it.
286 */
287 new_dev->mtu = real_dev->mtu;
288
289 vlan_dev_info(new_dev)->vlan_id = vlan_id;
290 vlan_dev_info(new_dev)->real_dev = real_dev;
291 vlan_dev_info(new_dev)->dent = NULL;
292 vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
293
294 new_dev->rtnl_link_ops = &vlan_link_ops;
295 err = register_vlan_dev(new_dev);
296 if (err < 0)
297 goto out_free_newdev;
298
299 return 0;
300
301 out_free_newdev:
302 free_netdev(new_dev);
303 return err;
304 }
305
vlan_sync_address(struct net_device * dev,struct net_device * vlandev)306 static void vlan_sync_address(struct net_device *dev,
307 struct net_device *vlandev)
308 {
309 struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
310
311 /* May be called without an actual change */
312 if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
313 return;
314
315 /* vlan address was different from the old address and is equal to
316 * the new address */
317 if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
318 !compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
319 dev_uc_del(dev, vlandev->dev_addr);
320
321 /* vlan address was equal to the old address and is different from
322 * the new address */
323 if (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
324 compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
325 dev_uc_add(dev, vlandev->dev_addr);
326
327 memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
328 }
329
vlan_transfer_features(struct net_device * dev,struct net_device * vlandev)330 static void vlan_transfer_features(struct net_device *dev,
331 struct net_device *vlandev)
332 {
333 u32 old_features = vlandev->features;
334
335 vlandev->features &= ~dev->vlan_features;
336 vlandev->features |= dev->features & dev->vlan_features;
337 vlandev->gso_max_size = dev->gso_max_size;
338
339 if (dev->features & NETIF_F_HW_VLAN_TX)
340 vlandev->hard_header_len = dev->hard_header_len;
341 else
342 vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
343
344 #if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
345 vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
346 #endif
347 if (old_features != vlandev->features)
348 netdev_features_change(vlandev);
349 }
350
__vlan_device_event(struct net_device * dev,unsigned long event)351 static void __vlan_device_event(struct net_device *dev, unsigned long event)
352 {
353 switch (event) {
354 case NETDEV_CHANGENAME:
355 vlan_proc_rem_dev(dev);
356 if (vlan_proc_add_dev(dev) < 0)
357 pr_warning("8021q: failed to change proc name for %s\n",
358 dev->name);
359 break;
360 case NETDEV_REGISTER:
361 if (vlan_proc_add_dev(dev) < 0)
362 pr_warning("8021q: failed to add proc entry for %s\n",
363 dev->name);
364 break;
365 case NETDEV_UNREGISTER:
366 vlan_proc_rem_dev(dev);
367 break;
368 }
369 }
370
vlan_device_event(struct notifier_block * unused,unsigned long event,void * ptr)371 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
372 void *ptr)
373 {
374 struct net_device *dev = ptr;
375 struct vlan_group *grp;
376 int i, flgs;
377 struct net_device *vlandev;
378 struct vlan_dev_info *vlan;
379 LIST_HEAD(list);
380
381 if (is_vlan_dev(dev))
382 __vlan_device_event(dev, event);
383
384 if ((event == NETDEV_UP) &&
385 (dev->features & NETIF_F_HW_VLAN_FILTER) &&
386 dev->netdev_ops->ndo_vlan_rx_add_vid) {
387 pr_info("8021q: adding VLAN 0 to HW filter on device %s\n",
388 dev->name);
389 dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
390 }
391
392 grp = rtnl_dereference(dev->vlgrp);
393 if (!grp)
394 goto out;
395
396 /* It is OK that we do not hold the group lock right now,
397 * as we run under the RTNL lock.
398 */
399
400 switch (event) {
401 case NETDEV_CHANGE:
402 /* Propagate real device state to vlan devices */
403 for (i = 0; i < VLAN_N_VID; i++) {
404 vlandev = vlan_group_get_device(grp, i);
405 if (!vlandev)
406 continue;
407
408 netif_stacked_transfer_operstate(dev, vlandev);
409 }
410 break;
411
412 case NETDEV_CHANGEADDR:
413 /* Adjust unicast filters on underlying device */
414 for (i = 0; i < VLAN_N_VID; i++) {
415 vlandev = vlan_group_get_device(grp, i);
416 if (!vlandev)
417 continue;
418
419 flgs = vlandev->flags;
420 if (!(flgs & IFF_UP))
421 continue;
422
423 vlan_sync_address(dev, vlandev);
424 }
425 break;
426
427 case NETDEV_CHANGEMTU:
428 for (i = 0; i < VLAN_N_VID; i++) {
429 vlandev = vlan_group_get_device(grp, i);
430 if (!vlandev)
431 continue;
432
433 if (vlandev->mtu <= dev->mtu)
434 continue;
435
436 dev_set_mtu(vlandev, dev->mtu);
437 }
438 break;
439
440 case NETDEV_FEAT_CHANGE:
441 /* Propagate device features to underlying device */
442 for (i = 0; i < VLAN_N_VID; i++) {
443 vlandev = vlan_group_get_device(grp, i);
444 if (!vlandev)
445 continue;
446
447 vlan_transfer_features(dev, vlandev);
448 }
449
450 break;
451
452 case NETDEV_DOWN:
453 /* Put all VLANs for this dev in the down state too. */
454 for (i = 0; i < VLAN_N_VID; i++) {
455 vlandev = vlan_group_get_device(grp, i);
456 if (!vlandev)
457 continue;
458
459 flgs = vlandev->flags;
460 if (!(flgs & IFF_UP))
461 continue;
462
463 vlan = vlan_dev_info(vlandev);
464 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
465 dev_change_flags(vlandev, flgs & ~IFF_UP);
466 netif_stacked_transfer_operstate(dev, vlandev);
467 }
468 break;
469
470 case NETDEV_UP:
471 /* Put all VLANs for this dev in the up state too. */
472 for (i = 0; i < VLAN_N_VID; i++) {
473 vlandev = vlan_group_get_device(grp, i);
474 if (!vlandev)
475 continue;
476
477 flgs = vlandev->flags;
478 if (flgs & IFF_UP)
479 continue;
480
481 vlan = vlan_dev_info(vlandev);
482 if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
483 dev_change_flags(vlandev, flgs | IFF_UP);
484 netif_stacked_transfer_operstate(dev, vlandev);
485 }
486 break;
487
488 case NETDEV_UNREGISTER:
489 /* twiddle thumbs on netns device moves */
490 if (dev->reg_state != NETREG_UNREGISTERING)
491 break;
492
493 /* Delete all VLANs for this dev. */
494 grp->killall = 1;
495
496 for (i = 0; i < VLAN_N_VID; i++) {
497 vlandev = vlan_group_get_device(grp, i);
498 if (!vlandev)
499 continue;
500
501 /* unregistration of last vlan destroys group, abort
502 * afterwards */
503 if (grp->nr_vlans == 1)
504 i = VLAN_N_VID;
505
506 unregister_vlan_dev(vlandev, &list);
507 }
508 unregister_netdevice_many(&list);
509 break;
510
511 case NETDEV_PRE_TYPE_CHANGE:
512 /* Forbid underlaying device to change its type. */
513 return NOTIFY_BAD;
514 }
515
516 out:
517 return NOTIFY_DONE;
518 }
519
520 static struct notifier_block vlan_notifier_block __read_mostly = {
521 .notifier_call = vlan_device_event,
522 };
523
524 /*
525 * VLAN IOCTL handler.
526 * o execute requested action or pass command to the device driver
527 * arg is really a struct vlan_ioctl_args __user *.
528 */
vlan_ioctl_handler(struct net * net,void __user * arg)529 static int vlan_ioctl_handler(struct net *net, void __user *arg)
530 {
531 int err;
532 struct vlan_ioctl_args args;
533 struct net_device *dev = NULL;
534
535 if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
536 return -EFAULT;
537
538 /* Null terminate this sucker, just in case. */
539 args.device1[23] = 0;
540 args.u.device2[23] = 0;
541
542 rtnl_lock();
543
544 switch (args.cmd) {
545 case SET_VLAN_INGRESS_PRIORITY_CMD:
546 case SET_VLAN_EGRESS_PRIORITY_CMD:
547 case SET_VLAN_FLAG_CMD:
548 case ADD_VLAN_CMD:
549 case DEL_VLAN_CMD:
550 case GET_VLAN_REALDEV_NAME_CMD:
551 case GET_VLAN_VID_CMD:
552 err = -ENODEV;
553 dev = __dev_get_by_name(net, args.device1);
554 if (!dev)
555 goto out;
556
557 err = -EINVAL;
558 if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
559 goto out;
560 }
561
562 switch (args.cmd) {
563 case SET_VLAN_INGRESS_PRIORITY_CMD:
564 err = -EPERM;
565 if (!capable(CAP_NET_ADMIN))
566 break;
567 vlan_dev_set_ingress_priority(dev,
568 args.u.skb_priority,
569 args.vlan_qos);
570 err = 0;
571 break;
572
573 case SET_VLAN_EGRESS_PRIORITY_CMD:
574 err = -EPERM;
575 if (!capable(CAP_NET_ADMIN))
576 break;
577 err = vlan_dev_set_egress_priority(dev,
578 args.u.skb_priority,
579 args.vlan_qos);
580 break;
581
582 case SET_VLAN_FLAG_CMD:
583 err = -EPERM;
584 if (!capable(CAP_NET_ADMIN))
585 break;
586 err = vlan_dev_change_flags(dev,
587 args.vlan_qos ? args.u.flag : 0,
588 args.u.flag);
589 break;
590
591 case SET_VLAN_NAME_TYPE_CMD:
592 err = -EPERM;
593 if (!capable(CAP_NET_ADMIN))
594 break;
595 if ((args.u.name_type >= 0) &&
596 (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
597 struct vlan_net *vn;
598
599 vn = net_generic(net, vlan_net_id);
600 vn->name_type = args.u.name_type;
601 err = 0;
602 } else {
603 err = -EINVAL;
604 }
605 break;
606
607 case ADD_VLAN_CMD:
608 err = -EPERM;
609 if (!capable(CAP_NET_ADMIN))
610 break;
611 err = register_vlan_device(dev, args.u.VID);
612 break;
613
614 case DEL_VLAN_CMD:
615 err = -EPERM;
616 if (!capable(CAP_NET_ADMIN))
617 break;
618 unregister_vlan_dev(dev, NULL);
619 err = 0;
620 break;
621
622 case GET_VLAN_REALDEV_NAME_CMD:
623 err = 0;
624 vlan_dev_get_realdev_name(dev, args.u.device2);
625 if (copy_to_user(arg, &args,
626 sizeof(struct vlan_ioctl_args)))
627 err = -EFAULT;
628 break;
629
630 case GET_VLAN_VID_CMD:
631 err = 0;
632 args.u.VID = vlan_dev_vlan_id(dev);
633 if (copy_to_user(arg, &args,
634 sizeof(struct vlan_ioctl_args)))
635 err = -EFAULT;
636 break;
637
638 default:
639 err = -EOPNOTSUPP;
640 break;
641 }
642 out:
643 rtnl_unlock();
644 return err;
645 }
646
vlan_init_net(struct net * net)647 static int __net_init vlan_init_net(struct net *net)
648 {
649 struct vlan_net *vn = net_generic(net, vlan_net_id);
650 int err;
651
652 vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
653
654 err = vlan_proc_init(net);
655
656 return err;
657 }
658
vlan_exit_net(struct net * net)659 static void __net_exit vlan_exit_net(struct net *net)
660 {
661 vlan_proc_cleanup(net);
662 }
663
664 static struct pernet_operations vlan_net_ops = {
665 .init = vlan_init_net,
666 .exit = vlan_exit_net,
667 .id = &vlan_net_id,
668 .size = sizeof(struct vlan_net),
669 };
670
vlan_proto_init(void)671 static int __init vlan_proto_init(void)
672 {
673 int err;
674
675 pr_info("%s v%s %s\n", vlan_fullname, vlan_version, vlan_copyright);
676 pr_info("All bugs added by %s\n", vlan_buggyright);
677
678 err = register_pernet_subsys(&vlan_net_ops);
679 if (err < 0)
680 goto err0;
681
682 err = register_netdevice_notifier(&vlan_notifier_block);
683 if (err < 0)
684 goto err2;
685
686 err = vlan_gvrp_init();
687 if (err < 0)
688 goto err3;
689
690 err = vlan_netlink_init();
691 if (err < 0)
692 goto err4;
693
694 dev_add_pack(&vlan_packet_type);
695 vlan_ioctl_set(vlan_ioctl_handler);
696 return 0;
697
698 err4:
699 vlan_gvrp_uninit();
700 err3:
701 unregister_netdevice_notifier(&vlan_notifier_block);
702 err2:
703 unregister_pernet_subsys(&vlan_net_ops);
704 err0:
705 return err;
706 }
707
vlan_cleanup_module(void)708 static void __exit vlan_cleanup_module(void)
709 {
710 vlan_ioctl_set(NULL);
711 vlan_netlink_fini();
712
713 unregister_netdevice_notifier(&vlan_notifier_block);
714
715 dev_remove_pack(&vlan_packet_type);
716
717 unregister_pernet_subsys(&vlan_net_ops);
718 rcu_barrier(); /* Wait for completion of call_rcu()'s */
719
720 vlan_gvrp_uninit();
721 }
722
723 module_init(vlan_proto_init);
724 module_exit(vlan_cleanup_module);
725
726 MODULE_LICENSE("GPL");
727 MODULE_VERSION(DRV_VERSION);
728