xref: /openbmc/linux/net/8021q/vlan.c (revision 31b90347)
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22 
23 #include <linux/capability.h>
24 #include <linux/module.h>
25 #include <linux/netdevice.h>
26 #include <linux/skbuff.h>
27 #include <linux/slab.h>
28 #include <linux/init.h>
29 #include <linux/rculist.h>
30 #include <net/p8022.h>
31 #include <net/arp.h>
32 #include <linux/rtnetlink.h>
33 #include <linux/notifier.h>
34 #include <net/rtnetlink.h>
35 #include <net/net_namespace.h>
36 #include <net/netns/generic.h>
37 #include <asm/uaccess.h>
38 
39 #include <linux/if_vlan.h>
40 #include "vlan.h"
41 #include "vlanproc.h"
42 
43 #define DRV_VERSION "1.8"
44 
45 /* Global VLAN variables */
46 
47 int vlan_net_id __read_mostly;
48 
49 const char vlan_fullname[] = "802.1Q VLAN Support";
50 const char vlan_version[] = DRV_VERSION;
51 
52 /* End of global variables definitions. */
53 
54 static int vlan_group_prealloc_vid(struct vlan_group *vg,
55 				   __be16 vlan_proto, u16 vlan_id)
56 {
57 	struct net_device **array;
58 	unsigned int pidx, vidx;
59 	unsigned int size;
60 
61 	ASSERT_RTNL();
62 
63 	pidx  = vlan_proto_idx(vlan_proto);
64 	vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
65 	array = vg->vlan_devices_arrays[pidx][vidx];
66 	if (array != NULL)
67 		return 0;
68 
69 	size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
70 	array = kzalloc(size, GFP_KERNEL);
71 	if (array == NULL)
72 		return -ENOBUFS;
73 
74 	vg->vlan_devices_arrays[pidx][vidx] = array;
75 	return 0;
76 }
77 
78 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
79 {
80 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
81 	struct net_device *real_dev = vlan->real_dev;
82 	struct vlan_info *vlan_info;
83 	struct vlan_group *grp;
84 	u16 vlan_id = vlan->vlan_id;
85 
86 	ASSERT_RTNL();
87 
88 	vlan_info = rtnl_dereference(real_dev->vlan_info);
89 	BUG_ON(!vlan_info);
90 
91 	grp = &vlan_info->grp;
92 
93 	grp->nr_vlan_devs--;
94 
95 	if (vlan->flags & VLAN_FLAG_MVRP)
96 		vlan_mvrp_request_leave(dev);
97 	if (vlan->flags & VLAN_FLAG_GVRP)
98 		vlan_gvrp_request_leave(dev);
99 
100 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
101 
102 	netdev_upper_dev_unlink(real_dev, dev);
103 	/* Because unregister_netdevice_queue() makes sure at least one rcu
104 	 * grace period is respected before device freeing,
105 	 * we dont need to call synchronize_net() here.
106 	 */
107 	unregister_netdevice_queue(dev, head);
108 
109 	if (grp->nr_vlan_devs == 0) {
110 		vlan_mvrp_uninit_applicant(real_dev);
111 		vlan_gvrp_uninit_applicant(real_dev);
112 	}
113 
114 	/* Take it out of our own structures, but be sure to interlock with
115 	 * HW accelerating devices or SW vlan input packet processing if
116 	 * VLAN is not 0 (leave it there for 802.1p).
117 	 */
118 	if (vlan_id)
119 		vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
120 
121 	/* Get rid of the vlan's reference to real_dev */
122 	dev_put(real_dev);
123 }
124 
125 int vlan_check_real_dev(struct net_device *real_dev,
126 			__be16 protocol, u16 vlan_id)
127 {
128 	const char *name = real_dev->name;
129 
130 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
131 		pr_info("VLANs not supported on %s\n", name);
132 		return -EOPNOTSUPP;
133 	}
134 
135 	if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL)
136 		return -EEXIST;
137 
138 	return 0;
139 }
140 
141 int register_vlan_dev(struct net_device *dev)
142 {
143 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
144 	struct net_device *real_dev = vlan->real_dev;
145 	u16 vlan_id = vlan->vlan_id;
146 	struct vlan_info *vlan_info;
147 	struct vlan_group *grp;
148 	int err;
149 
150 	err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
151 	if (err)
152 		return err;
153 
154 	vlan_info = rtnl_dereference(real_dev->vlan_info);
155 	/* vlan_info should be there now. vlan_vid_add took care of it */
156 	BUG_ON(!vlan_info);
157 
158 	grp = &vlan_info->grp;
159 	if (grp->nr_vlan_devs == 0) {
160 		err = vlan_gvrp_init_applicant(real_dev);
161 		if (err < 0)
162 			goto out_vid_del;
163 		err = vlan_mvrp_init_applicant(real_dev);
164 		if (err < 0)
165 			goto out_uninit_gvrp;
166 	}
167 
168 	err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
169 	if (err < 0)
170 		goto out_uninit_mvrp;
171 
172 	err = register_netdevice(dev);
173 	if (err < 0)
174 		goto out_uninit_mvrp;
175 
176 	err = netdev_upper_dev_link(real_dev, dev);
177 	if (err)
178 		goto out_unregister_netdev;
179 
180 	/* Account for reference in struct vlan_dev_priv */
181 	dev_hold(real_dev);
182 
183 	netif_stacked_transfer_operstate(real_dev, dev);
184 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
185 
186 	/* So, got the sucker initialized, now lets place
187 	 * it into our local structure.
188 	 */
189 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
190 	grp->nr_vlan_devs++;
191 
192 	return 0;
193 
194 out_unregister_netdev:
195 	unregister_netdevice(dev);
196 out_uninit_mvrp:
197 	if (grp->nr_vlan_devs == 0)
198 		vlan_mvrp_uninit_applicant(real_dev);
199 out_uninit_gvrp:
200 	if (grp->nr_vlan_devs == 0)
201 		vlan_gvrp_uninit_applicant(real_dev);
202 out_vid_del:
203 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
204 	return err;
205 }
206 
207 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
208  *  Returns 0 if the device was created or a negative error code otherwise.
209  */
210 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
211 {
212 	struct net_device *new_dev;
213 	struct vlan_dev_priv *vlan;
214 	struct net *net = dev_net(real_dev);
215 	struct vlan_net *vn = net_generic(net, vlan_net_id);
216 	char name[IFNAMSIZ];
217 	int err;
218 
219 	if (vlan_id >= VLAN_VID_MASK)
220 		return -ERANGE;
221 
222 	err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id);
223 	if (err < 0)
224 		return err;
225 
226 	/* Gotta set up the fields for the device. */
227 	switch (vn->name_type) {
228 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
229 		/* name will look like:	 eth1.0005 */
230 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
231 		break;
232 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
233 		/* Put our vlan.VID in the name.
234 		 * Name will look like:	 vlan5
235 		 */
236 		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
237 		break;
238 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
239 		/* Put our vlan.VID in the name.
240 		 * Name will look like:	 eth0.5
241 		 */
242 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
243 		break;
244 	case VLAN_NAME_TYPE_PLUS_VID:
245 		/* Put our vlan.VID in the name.
246 		 * Name will look like:	 vlan0005
247 		 */
248 	default:
249 		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
250 	}
251 
252 	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name, vlan_setup);
253 
254 	if (new_dev == NULL)
255 		return -ENOBUFS;
256 
257 	dev_net_set(new_dev, net);
258 	/* need 4 bytes for extra VLAN header info,
259 	 * hope the underlying device can handle it.
260 	 */
261 	new_dev->mtu = real_dev->mtu;
262 	new_dev->priv_flags |= (real_dev->priv_flags & IFF_UNICAST_FLT);
263 
264 	vlan = vlan_dev_priv(new_dev);
265 	vlan->vlan_proto = htons(ETH_P_8021Q);
266 	vlan->vlan_id = vlan_id;
267 	vlan->real_dev = real_dev;
268 	vlan->dent = NULL;
269 	vlan->flags = VLAN_FLAG_REORDER_HDR;
270 
271 	new_dev->rtnl_link_ops = &vlan_link_ops;
272 	err = register_vlan_dev(new_dev);
273 	if (err < 0)
274 		goto out_free_newdev;
275 
276 	return 0;
277 
278 out_free_newdev:
279 	free_netdev(new_dev);
280 	return err;
281 }
282 
283 static void vlan_sync_address(struct net_device *dev,
284 			      struct net_device *vlandev)
285 {
286 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
287 
288 	/* May be called without an actual change */
289 	if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
290 		return;
291 
292 	/* vlan address was different from the old address and is equal to
293 	 * the new address */
294 	if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
295 	    ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
296 		dev_uc_del(dev, vlandev->dev_addr);
297 
298 	/* vlan address was equal to the old address and is different from
299 	 * the new address */
300 	if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
301 	    !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
302 		dev_uc_add(dev, vlandev->dev_addr);
303 
304 	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
305 }
306 
307 static void vlan_transfer_features(struct net_device *dev,
308 				   struct net_device *vlandev)
309 {
310 	vlandev->gso_max_size = dev->gso_max_size;
311 
312 	if (dev->features & NETIF_F_HW_VLAN_CTAG_TX)
313 		vlandev->hard_header_len = dev->hard_header_len;
314 	else
315 		vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
316 
317 #if IS_ENABLED(CONFIG_FCOE)
318 	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
319 #endif
320 
321 	netdev_update_features(vlandev);
322 }
323 
324 static void __vlan_device_event(struct net_device *dev, unsigned long event)
325 {
326 	switch (event) {
327 	case NETDEV_CHANGENAME:
328 		vlan_proc_rem_dev(dev);
329 		if (vlan_proc_add_dev(dev) < 0)
330 			pr_warn("failed to change proc name for %s\n",
331 				dev->name);
332 		break;
333 	case NETDEV_REGISTER:
334 		if (vlan_proc_add_dev(dev) < 0)
335 			pr_warn("failed to add proc entry for %s\n", dev->name);
336 		break;
337 	case NETDEV_UNREGISTER:
338 		vlan_proc_rem_dev(dev);
339 		break;
340 	}
341 }
342 
343 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
344 			     void *ptr)
345 {
346 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
347 	struct vlan_group *grp;
348 	struct vlan_info *vlan_info;
349 	int i, flgs;
350 	struct net_device *vlandev;
351 	struct vlan_dev_priv *vlan;
352 	bool last = false;
353 	LIST_HEAD(list);
354 
355 	if (is_vlan_dev(dev))
356 		__vlan_device_event(dev, event);
357 
358 	if ((event == NETDEV_UP) &&
359 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
360 		pr_info("adding VLAN 0 to HW filter on device %s\n",
361 			dev->name);
362 		vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
363 	}
364 
365 	vlan_info = rtnl_dereference(dev->vlan_info);
366 	if (!vlan_info)
367 		goto out;
368 	grp = &vlan_info->grp;
369 
370 	/* It is OK that we do not hold the group lock right now,
371 	 * as we run under the RTNL lock.
372 	 */
373 
374 	switch (event) {
375 	case NETDEV_CHANGE:
376 		/* Propagate real device state to vlan devices */
377 		vlan_group_for_each_dev(grp, i, vlandev)
378 			netif_stacked_transfer_operstate(dev, vlandev);
379 		break;
380 
381 	case NETDEV_CHANGEADDR:
382 		/* Adjust unicast filters on underlying device */
383 		vlan_group_for_each_dev(grp, i, vlandev) {
384 			flgs = vlandev->flags;
385 			if (!(flgs & IFF_UP))
386 				continue;
387 
388 			vlan_sync_address(dev, vlandev);
389 		}
390 		break;
391 
392 	case NETDEV_CHANGEMTU:
393 		vlan_group_for_each_dev(grp, i, vlandev) {
394 			if (vlandev->mtu <= dev->mtu)
395 				continue;
396 
397 			dev_set_mtu(vlandev, dev->mtu);
398 		}
399 		break;
400 
401 	case NETDEV_FEAT_CHANGE:
402 		/* Propagate device features to underlying device */
403 		vlan_group_for_each_dev(grp, i, vlandev)
404 			vlan_transfer_features(dev, vlandev);
405 		break;
406 
407 	case NETDEV_DOWN:
408 		if (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)
409 			vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
410 
411 		/* Put all VLANs for this dev in the down state too.  */
412 		vlan_group_for_each_dev(grp, i, vlandev) {
413 			flgs = vlandev->flags;
414 			if (!(flgs & IFF_UP))
415 				continue;
416 
417 			vlan = vlan_dev_priv(vlandev);
418 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
419 				dev_change_flags(vlandev, flgs & ~IFF_UP);
420 			netif_stacked_transfer_operstate(dev, vlandev);
421 		}
422 		break;
423 
424 	case NETDEV_UP:
425 		/* Put all VLANs for this dev in the up state too.  */
426 		vlan_group_for_each_dev(grp, i, vlandev) {
427 			flgs = vlandev->flags;
428 			if (flgs & IFF_UP)
429 				continue;
430 
431 			vlan = vlan_dev_priv(vlandev);
432 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
433 				dev_change_flags(vlandev, flgs | IFF_UP);
434 			netif_stacked_transfer_operstate(dev, vlandev);
435 		}
436 		break;
437 
438 	case NETDEV_UNREGISTER:
439 		/* twiddle thumbs on netns device moves */
440 		if (dev->reg_state != NETREG_UNREGISTERING)
441 			break;
442 
443 		vlan_group_for_each_dev(grp, i, vlandev) {
444 			/* removal of last vid destroys vlan_info, abort
445 			 * afterwards */
446 			if (vlan_info->nr_vids == 1)
447 				last = true;
448 
449 			unregister_vlan_dev(vlandev, &list);
450 			if (last)
451 				break;
452 		}
453 		unregister_netdevice_many(&list);
454 		break;
455 
456 	case NETDEV_PRE_TYPE_CHANGE:
457 		/* Forbid underlaying device to change its type. */
458 		if (vlan_uses_dev(dev))
459 			return NOTIFY_BAD;
460 		break;
461 
462 	case NETDEV_NOTIFY_PEERS:
463 	case NETDEV_BONDING_FAILOVER:
464 	case NETDEV_RESEND_IGMP:
465 		/* Propagate to vlan devices */
466 		vlan_group_for_each_dev(grp, i, vlandev)
467 			call_netdevice_notifiers(event, vlandev);
468 		break;
469 	}
470 
471 out:
472 	return NOTIFY_DONE;
473 }
474 
475 static struct notifier_block vlan_notifier_block __read_mostly = {
476 	.notifier_call = vlan_device_event,
477 };
478 
479 /*
480  *	VLAN IOCTL handler.
481  *	o execute requested action or pass command to the device driver
482  *   arg is really a struct vlan_ioctl_args __user *.
483  */
484 static int vlan_ioctl_handler(struct net *net, void __user *arg)
485 {
486 	int err;
487 	struct vlan_ioctl_args args;
488 	struct net_device *dev = NULL;
489 
490 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
491 		return -EFAULT;
492 
493 	/* Null terminate this sucker, just in case. */
494 	args.device1[23] = 0;
495 	args.u.device2[23] = 0;
496 
497 	rtnl_lock();
498 
499 	switch (args.cmd) {
500 	case SET_VLAN_INGRESS_PRIORITY_CMD:
501 	case SET_VLAN_EGRESS_PRIORITY_CMD:
502 	case SET_VLAN_FLAG_CMD:
503 	case ADD_VLAN_CMD:
504 	case DEL_VLAN_CMD:
505 	case GET_VLAN_REALDEV_NAME_CMD:
506 	case GET_VLAN_VID_CMD:
507 		err = -ENODEV;
508 		dev = __dev_get_by_name(net, args.device1);
509 		if (!dev)
510 			goto out;
511 
512 		err = -EINVAL;
513 		if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
514 			goto out;
515 	}
516 
517 	switch (args.cmd) {
518 	case SET_VLAN_INGRESS_PRIORITY_CMD:
519 		err = -EPERM;
520 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
521 			break;
522 		vlan_dev_set_ingress_priority(dev,
523 					      args.u.skb_priority,
524 					      args.vlan_qos);
525 		err = 0;
526 		break;
527 
528 	case SET_VLAN_EGRESS_PRIORITY_CMD:
529 		err = -EPERM;
530 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
531 			break;
532 		err = vlan_dev_set_egress_priority(dev,
533 						   args.u.skb_priority,
534 						   args.vlan_qos);
535 		break;
536 
537 	case SET_VLAN_FLAG_CMD:
538 		err = -EPERM;
539 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
540 			break;
541 		err = vlan_dev_change_flags(dev,
542 					    args.vlan_qos ? args.u.flag : 0,
543 					    args.u.flag);
544 		break;
545 
546 	case SET_VLAN_NAME_TYPE_CMD:
547 		err = -EPERM;
548 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
549 			break;
550 		if ((args.u.name_type >= 0) &&
551 		    (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
552 			struct vlan_net *vn;
553 
554 			vn = net_generic(net, vlan_net_id);
555 			vn->name_type = args.u.name_type;
556 			err = 0;
557 		} else {
558 			err = -EINVAL;
559 		}
560 		break;
561 
562 	case ADD_VLAN_CMD:
563 		err = -EPERM;
564 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
565 			break;
566 		err = register_vlan_device(dev, args.u.VID);
567 		break;
568 
569 	case DEL_VLAN_CMD:
570 		err = -EPERM;
571 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
572 			break;
573 		unregister_vlan_dev(dev, NULL);
574 		err = 0;
575 		break;
576 
577 	case GET_VLAN_REALDEV_NAME_CMD:
578 		err = 0;
579 		vlan_dev_get_realdev_name(dev, args.u.device2);
580 		if (copy_to_user(arg, &args,
581 				 sizeof(struct vlan_ioctl_args)))
582 			err = -EFAULT;
583 		break;
584 
585 	case GET_VLAN_VID_CMD:
586 		err = 0;
587 		args.u.VID = vlan_dev_vlan_id(dev);
588 		if (copy_to_user(arg, &args,
589 				 sizeof(struct vlan_ioctl_args)))
590 		      err = -EFAULT;
591 		break;
592 
593 	default:
594 		err = -EOPNOTSUPP;
595 		break;
596 	}
597 out:
598 	rtnl_unlock();
599 	return err;
600 }
601 
602 static int __net_init vlan_init_net(struct net *net)
603 {
604 	struct vlan_net *vn = net_generic(net, vlan_net_id);
605 	int err;
606 
607 	vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
608 
609 	err = vlan_proc_init(net);
610 
611 	return err;
612 }
613 
614 static void __net_exit vlan_exit_net(struct net *net)
615 {
616 	vlan_proc_cleanup(net);
617 }
618 
619 static struct pernet_operations vlan_net_ops = {
620 	.init = vlan_init_net,
621 	.exit = vlan_exit_net,
622 	.id   = &vlan_net_id,
623 	.size = sizeof(struct vlan_net),
624 };
625 
626 static int __init vlan_proto_init(void)
627 {
628 	int err;
629 
630 	pr_info("%s v%s\n", vlan_fullname, vlan_version);
631 
632 	err = register_pernet_subsys(&vlan_net_ops);
633 	if (err < 0)
634 		goto err0;
635 
636 	err = register_netdevice_notifier(&vlan_notifier_block);
637 	if (err < 0)
638 		goto err2;
639 
640 	err = vlan_gvrp_init();
641 	if (err < 0)
642 		goto err3;
643 
644 	err = vlan_mvrp_init();
645 	if (err < 0)
646 		goto err4;
647 
648 	err = vlan_netlink_init();
649 	if (err < 0)
650 		goto err5;
651 
652 	vlan_ioctl_set(vlan_ioctl_handler);
653 	return 0;
654 
655 err5:
656 	vlan_mvrp_uninit();
657 err4:
658 	vlan_gvrp_uninit();
659 err3:
660 	unregister_netdevice_notifier(&vlan_notifier_block);
661 err2:
662 	unregister_pernet_subsys(&vlan_net_ops);
663 err0:
664 	return err;
665 }
666 
667 static void __exit vlan_cleanup_module(void)
668 {
669 	vlan_ioctl_set(NULL);
670 	vlan_netlink_fini();
671 
672 	unregister_netdevice_notifier(&vlan_notifier_block);
673 
674 	unregister_pernet_subsys(&vlan_net_ops);
675 	rcu_barrier(); /* Wait for completion of call_rcu()'s */
676 
677 	vlan_mvrp_uninit();
678 	vlan_gvrp_uninit();
679 }
680 
681 module_init(vlan_proto_init);
682 module_exit(vlan_cleanup_module);
683 
684 MODULE_LICENSE("GPL");
685 MODULE_VERSION(DRV_VERSION);
686