xref: /openbmc/linux/net/8021q/vlan.c (revision 0ad53fe3)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * INET		802.1Q VLAN
4  *		Ethernet-type device handling.
5  *
6  * Authors:	Ben Greear <greearb@candelatech.com>
7  *              Please send support related email to: netdev@vger.kernel.org
8  *              VLAN Home Page: http://www.candelatech.com/~greear/vlan.html
9  *
10  * Fixes:
11  *              Fix for packet capture - Nick Eggleston <nick@dccinc.com>;
12  *		Add HW acceleration hooks - David S. Miller <davem@redhat.com>;
13  *		Correct all the locking - David S. Miller <davem@redhat.com>;
14  *		Use hash table for VLAN groups - David S. Miller <davem@redhat.com>
15  */
16 
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18 
19 #include <linux/capability.h>
20 #include <linux/module.h>
21 #include <linux/netdevice.h>
22 #include <linux/skbuff.h>
23 #include <linux/slab.h>
24 #include <linux/init.h>
25 #include <linux/rculist.h>
26 #include <net/p8022.h>
27 #include <net/arp.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/notifier.h>
30 #include <net/rtnetlink.h>
31 #include <net/net_namespace.h>
32 #include <net/netns/generic.h>
33 #include <linux/uaccess.h>
34 
35 #include <linux/if_vlan.h>
36 #include "vlan.h"
37 #include "vlanproc.h"
38 
39 #define DRV_VERSION "1.8"
40 
41 /* Global VLAN variables */
42 
43 unsigned int vlan_net_id __read_mostly;
44 
45 const char vlan_fullname[] = "802.1Q VLAN Support";
46 const char vlan_version[] = DRV_VERSION;
47 
48 /* End of global variables definitions. */
49 
50 static int vlan_group_prealloc_vid(struct vlan_group *vg,
51 				   __be16 vlan_proto, u16 vlan_id)
52 {
53 	struct net_device **array;
54 	unsigned int vidx;
55 	unsigned int size;
56 	int pidx;
57 
58 	ASSERT_RTNL();
59 
60 	pidx  = vlan_proto_idx(vlan_proto);
61 	if (pidx < 0)
62 		return -EINVAL;
63 
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_ACCOUNT);
71 	if (array == NULL)
72 		return -ENOBUFS;
73 
74 	/* paired with smp_rmb() in __vlan_group_get_device() */
75 	smp_wmb();
76 
77 	vg->vlan_devices_arrays[pidx][vidx] = array;
78 	return 0;
79 }
80 
81 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
82 					    struct net_device *dev,
83 					    struct vlan_dev_priv *vlan)
84 {
85 	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
86 		netif_stacked_transfer_operstate(rootdev, dev);
87 }
88 
89 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
90 {
91 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
92 	struct net_device *real_dev = vlan->real_dev;
93 	struct vlan_info *vlan_info;
94 	struct vlan_group *grp;
95 	u16 vlan_id = vlan->vlan_id;
96 
97 	ASSERT_RTNL();
98 
99 	vlan_info = rtnl_dereference(real_dev->vlan_info);
100 	BUG_ON(!vlan_info);
101 
102 	grp = &vlan_info->grp;
103 
104 	grp->nr_vlan_devs--;
105 
106 	if (vlan->flags & VLAN_FLAG_MVRP)
107 		vlan_mvrp_request_leave(dev);
108 	if (vlan->flags & VLAN_FLAG_GVRP)
109 		vlan_gvrp_request_leave(dev);
110 
111 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
112 
113 	netdev_upper_dev_unlink(real_dev, dev);
114 	/* Because unregister_netdevice_queue() makes sure at least one rcu
115 	 * grace period is respected before device freeing,
116 	 * we dont need to call synchronize_net() here.
117 	 */
118 	unregister_netdevice_queue(dev, head);
119 
120 	if (grp->nr_vlan_devs == 0) {
121 		vlan_mvrp_uninit_applicant(real_dev);
122 		vlan_gvrp_uninit_applicant(real_dev);
123 	}
124 
125 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
126 
127 	/* Get rid of the vlan's reference to real_dev */
128 	dev_put(real_dev);
129 }
130 
131 int vlan_check_real_dev(struct net_device *real_dev,
132 			__be16 protocol, u16 vlan_id,
133 			struct netlink_ext_ack *extack)
134 {
135 	const char *name = real_dev->name;
136 
137 	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
138 		pr_info("VLANs not supported on %s\n", name);
139 		NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
140 		return -EOPNOTSUPP;
141 	}
142 
143 	if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
144 		NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
145 		return -EEXIST;
146 	}
147 
148 	return 0;
149 }
150 
151 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
152 {
153 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
154 	struct net_device *real_dev = vlan->real_dev;
155 	u16 vlan_id = vlan->vlan_id;
156 	struct vlan_info *vlan_info;
157 	struct vlan_group *grp;
158 	int err;
159 
160 	err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
161 	if (err)
162 		return err;
163 
164 	vlan_info = rtnl_dereference(real_dev->vlan_info);
165 	/* vlan_info should be there now. vlan_vid_add took care of it */
166 	BUG_ON(!vlan_info);
167 
168 	grp = &vlan_info->grp;
169 	if (grp->nr_vlan_devs == 0) {
170 		err = vlan_gvrp_init_applicant(real_dev);
171 		if (err < 0)
172 			goto out_vid_del;
173 		err = vlan_mvrp_init_applicant(real_dev);
174 		if (err < 0)
175 			goto out_uninit_gvrp;
176 	}
177 
178 	err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
179 	if (err < 0)
180 		goto out_uninit_mvrp;
181 
182 	err = register_netdevice(dev);
183 	if (err < 0)
184 		goto out_uninit_mvrp;
185 
186 	err = netdev_upper_dev_link(real_dev, dev, extack);
187 	if (err)
188 		goto out_unregister_netdev;
189 
190 	/* Account for reference in struct vlan_dev_priv */
191 	dev_hold(real_dev);
192 
193 	vlan_stacked_transfer_operstate(real_dev, dev, vlan);
194 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
195 
196 	/* So, got the sucker initialized, now lets place
197 	 * it into our local structure.
198 	 */
199 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
200 	grp->nr_vlan_devs++;
201 
202 	return 0;
203 
204 out_unregister_netdev:
205 	unregister_netdevice(dev);
206 out_uninit_mvrp:
207 	if (grp->nr_vlan_devs == 0)
208 		vlan_mvrp_uninit_applicant(real_dev);
209 out_uninit_gvrp:
210 	if (grp->nr_vlan_devs == 0)
211 		vlan_gvrp_uninit_applicant(real_dev);
212 out_vid_del:
213 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
214 	return err;
215 }
216 
217 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
218  *  Returns 0 if the device was created or a negative error code otherwise.
219  */
220 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
221 {
222 	struct net_device *new_dev;
223 	struct vlan_dev_priv *vlan;
224 	struct net *net = dev_net(real_dev);
225 	struct vlan_net *vn = net_generic(net, vlan_net_id);
226 	char name[IFNAMSIZ];
227 	int err;
228 
229 	if (vlan_id >= VLAN_VID_MASK)
230 		return -ERANGE;
231 
232 	err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
233 				  NULL);
234 	if (err < 0)
235 		return err;
236 
237 	/* Gotta set up the fields for the device. */
238 	switch (vn->name_type) {
239 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
240 		/* name will look like:	 eth1.0005 */
241 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
242 		break;
243 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
244 		/* Put our vlan.VID in the name.
245 		 * Name will look like:	 vlan5
246 		 */
247 		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
248 		break;
249 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
250 		/* Put our vlan.VID in the name.
251 		 * Name will look like:	 eth0.5
252 		 */
253 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
254 		break;
255 	case VLAN_NAME_TYPE_PLUS_VID:
256 		/* Put our vlan.VID in the name.
257 		 * Name will look like:	 vlan0005
258 		 */
259 	default:
260 		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
261 	}
262 
263 	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
264 			       NET_NAME_UNKNOWN, vlan_setup);
265 
266 	if (new_dev == NULL)
267 		return -ENOBUFS;
268 
269 	dev_net_set(new_dev, net);
270 	/* need 4 bytes for extra VLAN header info,
271 	 * hope the underlying device can handle it.
272 	 */
273 	new_dev->mtu = real_dev->mtu;
274 
275 	vlan = vlan_dev_priv(new_dev);
276 	vlan->vlan_proto = htons(ETH_P_8021Q);
277 	vlan->vlan_id = vlan_id;
278 	vlan->real_dev = real_dev;
279 	vlan->dent = NULL;
280 	vlan->flags = VLAN_FLAG_REORDER_HDR;
281 
282 	new_dev->rtnl_link_ops = &vlan_link_ops;
283 	err = register_vlan_dev(new_dev, NULL);
284 	if (err < 0)
285 		goto out_free_newdev;
286 
287 	return 0;
288 
289 out_free_newdev:
290 	free_netdev(new_dev);
291 	return err;
292 }
293 
294 static void vlan_sync_address(struct net_device *dev,
295 			      struct net_device *vlandev)
296 {
297 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
298 
299 	/* May be called without an actual change */
300 	if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
301 		return;
302 
303 	/* vlan continues to inherit address of lower device */
304 	if (vlan_dev_inherit_address(vlandev, dev))
305 		goto out;
306 
307 	/* vlan address was different from the old address and is equal to
308 	 * the new address */
309 	if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
310 	    ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
311 		dev_uc_del(dev, vlandev->dev_addr);
312 
313 	/* vlan address was equal to the old address and is different from
314 	 * the new address */
315 	if (ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
316 	    !ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
317 		dev_uc_add(dev, vlandev->dev_addr);
318 
319 out:
320 	ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
321 }
322 
323 static void vlan_transfer_features(struct net_device *dev,
324 				   struct net_device *vlandev)
325 {
326 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
327 
328 	vlandev->gso_max_size = dev->gso_max_size;
329 	vlandev->gso_max_segs = dev->gso_max_segs;
330 
331 	if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
332 		vlandev->hard_header_len = dev->hard_header_len;
333 	else
334 		vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
335 
336 #if IS_ENABLED(CONFIG_FCOE)
337 	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
338 #endif
339 
340 	vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
341 	vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
342 	vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
343 
344 	netdev_update_features(vlandev);
345 }
346 
347 static int __vlan_device_event(struct net_device *dev, unsigned long event)
348 {
349 	int err = 0;
350 
351 	switch (event) {
352 	case NETDEV_CHANGENAME:
353 		vlan_proc_rem_dev(dev);
354 		err = vlan_proc_add_dev(dev);
355 		break;
356 	case NETDEV_REGISTER:
357 		err = vlan_proc_add_dev(dev);
358 		break;
359 	case NETDEV_UNREGISTER:
360 		vlan_proc_rem_dev(dev);
361 		break;
362 	}
363 
364 	return err;
365 }
366 
367 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
368 			     void *ptr)
369 {
370 	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
371 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
372 	struct vlan_group *grp;
373 	struct vlan_info *vlan_info;
374 	int i, flgs;
375 	struct net_device *vlandev;
376 	struct vlan_dev_priv *vlan;
377 	bool last = false;
378 	LIST_HEAD(list);
379 	int err;
380 
381 	if (is_vlan_dev(dev)) {
382 		int err = __vlan_device_event(dev, event);
383 
384 		if (err)
385 			return notifier_from_errno(err);
386 	}
387 
388 	if ((event == NETDEV_UP) &&
389 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
390 		pr_info("adding VLAN 0 to HW filter on device %s\n",
391 			dev->name);
392 		vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
393 	}
394 	if (event == NETDEV_DOWN &&
395 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
396 		vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
397 
398 	vlan_info = rtnl_dereference(dev->vlan_info);
399 	if (!vlan_info)
400 		goto out;
401 	grp = &vlan_info->grp;
402 
403 	/* It is OK that we do not hold the group lock right now,
404 	 * as we run under the RTNL lock.
405 	 */
406 
407 	switch (event) {
408 	case NETDEV_CHANGE:
409 		/* Propagate real device state to vlan devices */
410 		vlan_group_for_each_dev(grp, i, vlandev)
411 			vlan_stacked_transfer_operstate(dev, vlandev,
412 							vlan_dev_priv(vlandev));
413 		break;
414 
415 	case NETDEV_CHANGEADDR:
416 		/* Adjust unicast filters on underlying device */
417 		vlan_group_for_each_dev(grp, i, vlandev) {
418 			flgs = vlandev->flags;
419 			if (!(flgs & IFF_UP))
420 				continue;
421 
422 			vlan_sync_address(dev, vlandev);
423 		}
424 		break;
425 
426 	case NETDEV_CHANGEMTU:
427 		vlan_group_for_each_dev(grp, i, vlandev) {
428 			if (vlandev->mtu <= dev->mtu)
429 				continue;
430 
431 			dev_set_mtu(vlandev, dev->mtu);
432 		}
433 		break;
434 
435 	case NETDEV_FEAT_CHANGE:
436 		/* Propagate device features to underlying device */
437 		vlan_group_for_each_dev(grp, i, vlandev)
438 			vlan_transfer_features(dev, vlandev);
439 		break;
440 
441 	case NETDEV_DOWN: {
442 		struct net_device *tmp;
443 		LIST_HEAD(close_list);
444 
445 		/* Put all VLANs for this dev in the down state too.  */
446 		vlan_group_for_each_dev(grp, i, vlandev) {
447 			flgs = vlandev->flags;
448 			if (!(flgs & IFF_UP))
449 				continue;
450 
451 			vlan = vlan_dev_priv(vlandev);
452 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
453 				list_add(&vlandev->close_list, &close_list);
454 		}
455 
456 		dev_close_many(&close_list, false);
457 
458 		list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
459 			vlan_stacked_transfer_operstate(dev, vlandev,
460 							vlan_dev_priv(vlandev));
461 			list_del_init(&vlandev->close_list);
462 		}
463 		list_del(&close_list);
464 		break;
465 	}
466 	case NETDEV_UP:
467 		/* Put all VLANs for this dev in the up state too.  */
468 		vlan_group_for_each_dev(grp, i, vlandev) {
469 			flgs = dev_get_flags(vlandev);
470 			if (flgs & IFF_UP)
471 				continue;
472 
473 			vlan = vlan_dev_priv(vlandev);
474 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
475 				dev_change_flags(vlandev, flgs | IFF_UP,
476 						 extack);
477 			vlan_stacked_transfer_operstate(dev, vlandev, vlan);
478 		}
479 		break;
480 
481 	case NETDEV_UNREGISTER:
482 		/* twiddle thumbs on netns device moves */
483 		if (dev->reg_state != NETREG_UNREGISTERING)
484 			break;
485 
486 		vlan_group_for_each_dev(grp, i, vlandev) {
487 			/* removal of last vid destroys vlan_info, abort
488 			 * afterwards */
489 			if (vlan_info->nr_vids == 1)
490 				last = true;
491 
492 			unregister_vlan_dev(vlandev, &list);
493 			if (last)
494 				break;
495 		}
496 		unregister_netdevice_many(&list);
497 		break;
498 
499 	case NETDEV_PRE_TYPE_CHANGE:
500 		/* Forbid underlaying device to change its type. */
501 		if (vlan_uses_dev(dev))
502 			return NOTIFY_BAD;
503 		break;
504 
505 	case NETDEV_NOTIFY_PEERS:
506 	case NETDEV_BONDING_FAILOVER:
507 	case NETDEV_RESEND_IGMP:
508 		/* Propagate to vlan devices */
509 		vlan_group_for_each_dev(grp, i, vlandev)
510 			call_netdevice_notifiers(event, vlandev);
511 		break;
512 
513 	case NETDEV_CVLAN_FILTER_PUSH_INFO:
514 		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
515 		if (err)
516 			return notifier_from_errno(err);
517 		break;
518 
519 	case NETDEV_CVLAN_FILTER_DROP_INFO:
520 		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
521 		break;
522 
523 	case NETDEV_SVLAN_FILTER_PUSH_INFO:
524 		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
525 		if (err)
526 			return notifier_from_errno(err);
527 		break;
528 
529 	case NETDEV_SVLAN_FILTER_DROP_INFO:
530 		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
531 		break;
532 	}
533 
534 out:
535 	return NOTIFY_DONE;
536 }
537 
538 static struct notifier_block vlan_notifier_block __read_mostly = {
539 	.notifier_call = vlan_device_event,
540 };
541 
542 /*
543  *	VLAN IOCTL handler.
544  *	o execute requested action or pass command to the device driver
545  *   arg is really a struct vlan_ioctl_args __user *.
546  */
547 static int vlan_ioctl_handler(struct net *net, void __user *arg)
548 {
549 	int err;
550 	struct vlan_ioctl_args args;
551 	struct net_device *dev = NULL;
552 
553 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
554 		return -EFAULT;
555 
556 	/* Null terminate this sucker, just in case. */
557 	args.device1[sizeof(args.device1) - 1] = 0;
558 	args.u.device2[sizeof(args.u.device2) - 1] = 0;
559 
560 	rtnl_lock();
561 
562 	switch (args.cmd) {
563 	case SET_VLAN_INGRESS_PRIORITY_CMD:
564 	case SET_VLAN_EGRESS_PRIORITY_CMD:
565 	case SET_VLAN_FLAG_CMD:
566 	case ADD_VLAN_CMD:
567 	case DEL_VLAN_CMD:
568 	case GET_VLAN_REALDEV_NAME_CMD:
569 	case GET_VLAN_VID_CMD:
570 		err = -ENODEV;
571 		dev = __dev_get_by_name(net, args.device1);
572 		if (!dev)
573 			goto out;
574 
575 		err = -EINVAL;
576 		if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
577 			goto out;
578 	}
579 
580 	switch (args.cmd) {
581 	case SET_VLAN_INGRESS_PRIORITY_CMD:
582 		err = -EPERM;
583 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
584 			break;
585 		vlan_dev_set_ingress_priority(dev,
586 					      args.u.skb_priority,
587 					      args.vlan_qos);
588 		err = 0;
589 		break;
590 
591 	case SET_VLAN_EGRESS_PRIORITY_CMD:
592 		err = -EPERM;
593 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
594 			break;
595 		err = vlan_dev_set_egress_priority(dev,
596 						   args.u.skb_priority,
597 						   args.vlan_qos);
598 		break;
599 
600 	case SET_VLAN_FLAG_CMD:
601 		err = -EPERM;
602 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
603 			break;
604 		err = vlan_dev_change_flags(dev,
605 					    args.vlan_qos ? args.u.flag : 0,
606 					    args.u.flag);
607 		break;
608 
609 	case SET_VLAN_NAME_TYPE_CMD:
610 		err = -EPERM;
611 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
612 			break;
613 		if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
614 			struct vlan_net *vn;
615 
616 			vn = net_generic(net, vlan_net_id);
617 			vn->name_type = args.u.name_type;
618 			err = 0;
619 		} else {
620 			err = -EINVAL;
621 		}
622 		break;
623 
624 	case ADD_VLAN_CMD:
625 		err = -EPERM;
626 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
627 			break;
628 		err = register_vlan_device(dev, args.u.VID);
629 		break;
630 
631 	case DEL_VLAN_CMD:
632 		err = -EPERM;
633 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
634 			break;
635 		unregister_vlan_dev(dev, NULL);
636 		err = 0;
637 		break;
638 
639 	case GET_VLAN_REALDEV_NAME_CMD:
640 		err = 0;
641 		vlan_dev_get_realdev_name(dev, args.u.device2,
642 					  sizeof(args.u.device2));
643 		if (copy_to_user(arg, &args,
644 				 sizeof(struct vlan_ioctl_args)))
645 			err = -EFAULT;
646 		break;
647 
648 	case GET_VLAN_VID_CMD:
649 		err = 0;
650 		args.u.VID = vlan_dev_vlan_id(dev);
651 		if (copy_to_user(arg, &args,
652 				 sizeof(struct vlan_ioctl_args)))
653 		      err = -EFAULT;
654 		break;
655 
656 	default:
657 		err = -EOPNOTSUPP;
658 		break;
659 	}
660 out:
661 	rtnl_unlock();
662 	return err;
663 }
664 
665 static int __net_init vlan_init_net(struct net *net)
666 {
667 	struct vlan_net *vn = net_generic(net, vlan_net_id);
668 	int err;
669 
670 	vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
671 
672 	err = vlan_proc_init(net);
673 
674 	return err;
675 }
676 
677 static void __net_exit vlan_exit_net(struct net *net)
678 {
679 	vlan_proc_cleanup(net);
680 }
681 
682 static struct pernet_operations vlan_net_ops = {
683 	.init = vlan_init_net,
684 	.exit = vlan_exit_net,
685 	.id   = &vlan_net_id,
686 	.size = sizeof(struct vlan_net),
687 };
688 
689 static int __init vlan_proto_init(void)
690 {
691 	int err;
692 
693 	pr_info("%s v%s\n", vlan_fullname, vlan_version);
694 
695 	err = register_pernet_subsys(&vlan_net_ops);
696 	if (err < 0)
697 		goto err0;
698 
699 	err = register_netdevice_notifier(&vlan_notifier_block);
700 	if (err < 0)
701 		goto err2;
702 
703 	err = vlan_gvrp_init();
704 	if (err < 0)
705 		goto err3;
706 
707 	err = vlan_mvrp_init();
708 	if (err < 0)
709 		goto err4;
710 
711 	err = vlan_netlink_init();
712 	if (err < 0)
713 		goto err5;
714 
715 	vlan_ioctl_set(vlan_ioctl_handler);
716 	return 0;
717 
718 err5:
719 	vlan_mvrp_uninit();
720 err4:
721 	vlan_gvrp_uninit();
722 err3:
723 	unregister_netdevice_notifier(&vlan_notifier_block);
724 err2:
725 	unregister_pernet_subsys(&vlan_net_ops);
726 err0:
727 	return err;
728 }
729 
730 static void __exit vlan_cleanup_module(void)
731 {
732 	vlan_ioctl_set(NULL);
733 
734 	vlan_netlink_fini();
735 
736 	unregister_netdevice_notifier(&vlan_notifier_block);
737 
738 	unregister_pernet_subsys(&vlan_net_ops);
739 	rcu_barrier(); /* Wait for completion of call_rcu()'s */
740 
741 	vlan_mvrp_uninit();
742 	vlan_gvrp_uninit();
743 }
744 
745 module_init(vlan_proto_init);
746 module_exit(vlan_cleanup_module);
747 
748 MODULE_LICENSE("GPL");
749 MODULE_VERSION(DRV_VERSION);
750