xref: /openbmc/linux/net/8021q/vlan.c (revision 3e30a927)
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 pidx, vidx;
55 	unsigned int size;
56 
57 	ASSERT_RTNL();
58 
59 	pidx  = vlan_proto_idx(vlan_proto);
60 	vidx  = vlan_id / VLAN_GROUP_ARRAY_PART_LEN;
61 	array = vg->vlan_devices_arrays[pidx][vidx];
62 	if (array != NULL)
63 		return 0;
64 
65 	size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
66 	array = kzalloc(size, GFP_KERNEL);
67 	if (array == NULL)
68 		return -ENOBUFS;
69 
70 	vg->vlan_devices_arrays[pidx][vidx] = array;
71 	return 0;
72 }
73 
74 static void vlan_stacked_transfer_operstate(const struct net_device *rootdev,
75 					    struct net_device *dev,
76 					    struct vlan_dev_priv *vlan)
77 {
78 	if (!(vlan->flags & VLAN_FLAG_BRIDGE_BINDING))
79 		netif_stacked_transfer_operstate(rootdev, dev);
80 }
81 
82 void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
83 {
84 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
85 	struct net_device *real_dev = vlan->real_dev;
86 	struct vlan_info *vlan_info;
87 	struct vlan_group *grp;
88 	u16 vlan_id = vlan->vlan_id;
89 
90 	ASSERT_RTNL();
91 
92 	vlan_info = rtnl_dereference(real_dev->vlan_info);
93 	BUG_ON(!vlan_info);
94 
95 	grp = &vlan_info->grp;
96 
97 	grp->nr_vlan_devs--;
98 
99 	if (vlan->flags & VLAN_FLAG_MVRP)
100 		vlan_mvrp_request_leave(dev);
101 	if (vlan->flags & VLAN_FLAG_GVRP)
102 		vlan_gvrp_request_leave(dev);
103 
104 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, NULL);
105 
106 	netdev_upper_dev_unlink(real_dev, dev);
107 	/* Because unregister_netdevice_queue() makes sure at least one rcu
108 	 * grace period is respected before device freeing,
109 	 * we dont need to call synchronize_net() here.
110 	 */
111 	unregister_netdevice_queue(dev, head);
112 
113 	if (grp->nr_vlan_devs == 0) {
114 		vlan_mvrp_uninit_applicant(real_dev);
115 		vlan_gvrp_uninit_applicant(real_dev);
116 	}
117 
118 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
119 
120 	/* Get rid of the vlan's reference to real_dev */
121 	dev_put(real_dev);
122 }
123 
124 int vlan_check_real_dev(struct net_device *real_dev,
125 			__be16 protocol, u16 vlan_id,
126 			struct netlink_ext_ack *extack)
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 		NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
133 		return -EOPNOTSUPP;
134 	}
135 
136 	if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
137 		NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
138 		return -EEXIST;
139 	}
140 
141 	return 0;
142 }
143 
144 int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
145 {
146 	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
147 	struct net_device *real_dev = vlan->real_dev;
148 	u16 vlan_id = vlan->vlan_id;
149 	struct vlan_info *vlan_info;
150 	struct vlan_group *grp;
151 	int err;
152 
153 	err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
154 	if (err)
155 		return err;
156 
157 	vlan_info = rtnl_dereference(real_dev->vlan_info);
158 	/* vlan_info should be there now. vlan_vid_add took care of it */
159 	BUG_ON(!vlan_info);
160 
161 	grp = &vlan_info->grp;
162 	if (grp->nr_vlan_devs == 0) {
163 		err = vlan_gvrp_init_applicant(real_dev);
164 		if (err < 0)
165 			goto out_vid_del;
166 		err = vlan_mvrp_init_applicant(real_dev);
167 		if (err < 0)
168 			goto out_uninit_gvrp;
169 	}
170 
171 	err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
172 	if (err < 0)
173 		goto out_uninit_mvrp;
174 
175 	err = register_netdevice(dev);
176 	if (err < 0)
177 		goto out_uninit_mvrp;
178 
179 	err = netdev_upper_dev_link(real_dev, dev, extack);
180 	if (err)
181 		goto out_unregister_netdev;
182 
183 	/* Account for reference in struct vlan_dev_priv */
184 	dev_hold(real_dev);
185 
186 	vlan_stacked_transfer_operstate(real_dev, dev, vlan);
187 	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
188 
189 	/* So, got the sucker initialized, now lets place
190 	 * it into our local structure.
191 	 */
192 	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
193 	grp->nr_vlan_devs++;
194 
195 	return 0;
196 
197 out_unregister_netdev:
198 	unregister_netdevice(dev);
199 out_uninit_mvrp:
200 	if (grp->nr_vlan_devs == 0)
201 		vlan_mvrp_uninit_applicant(real_dev);
202 out_uninit_gvrp:
203 	if (grp->nr_vlan_devs == 0)
204 		vlan_gvrp_uninit_applicant(real_dev);
205 out_vid_del:
206 	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
207 	return err;
208 }
209 
210 /*  Attach a VLAN device to a mac address (ie Ethernet Card).
211  *  Returns 0 if the device was created or a negative error code otherwise.
212  */
213 static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
214 {
215 	struct net_device *new_dev;
216 	struct vlan_dev_priv *vlan;
217 	struct net *net = dev_net(real_dev);
218 	struct vlan_net *vn = net_generic(net, vlan_net_id);
219 	char name[IFNAMSIZ];
220 	int err;
221 
222 	if (vlan_id >= VLAN_VID_MASK)
223 		return -ERANGE;
224 
225 	err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
226 				  NULL);
227 	if (err < 0)
228 		return err;
229 
230 	/* Gotta set up the fields for the device. */
231 	switch (vn->name_type) {
232 	case VLAN_NAME_TYPE_RAW_PLUS_VID:
233 		/* name will look like:	 eth1.0005 */
234 		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
235 		break;
236 	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
237 		/* Put our vlan.VID in the name.
238 		 * Name will look like:	 vlan5
239 		 */
240 		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
241 		break;
242 	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
243 		/* Put our vlan.VID in the name.
244 		 * Name will look like:	 eth0.5
245 		 */
246 		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
247 		break;
248 	case VLAN_NAME_TYPE_PLUS_VID:
249 		/* Put our vlan.VID in the name.
250 		 * Name will look like:	 vlan0005
251 		 */
252 	default:
253 		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
254 	}
255 
256 	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
257 			       NET_NAME_UNKNOWN, vlan_setup);
258 
259 	if (new_dev == NULL)
260 		return -ENOBUFS;
261 
262 	dev_net_set(new_dev, net);
263 	/* need 4 bytes for extra VLAN header info,
264 	 * hope the underlying device can handle it.
265 	 */
266 	new_dev->mtu = real_dev->mtu;
267 
268 	vlan = vlan_dev_priv(new_dev);
269 	vlan->vlan_proto = htons(ETH_P_8021Q);
270 	vlan->vlan_id = vlan_id;
271 	vlan->real_dev = real_dev;
272 	vlan->dent = NULL;
273 	vlan->flags = VLAN_FLAG_REORDER_HDR;
274 
275 	new_dev->rtnl_link_ops = &vlan_link_ops;
276 	err = register_vlan_dev(new_dev, NULL);
277 	if (err < 0)
278 		goto out_free_newdev;
279 
280 	return 0;
281 
282 out_free_newdev:
283 	if (new_dev->reg_state == NETREG_UNINITIALIZED)
284 		free_netdev(new_dev);
285 	return err;
286 }
287 
288 static void vlan_sync_address(struct net_device *dev,
289 			      struct net_device *vlandev)
290 {
291 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
292 
293 	/* May be called without an actual change */
294 	if (ether_addr_equal(vlan->real_dev_addr, dev->dev_addr))
295 		return;
296 
297 	/* vlan continues to inherit address of lower device */
298 	if (vlan_dev_inherit_address(vlandev, dev))
299 		goto out;
300 
301 	/* vlan address was different from the old address and is equal to
302 	 * the new address */
303 	if (!ether_addr_equal(vlandev->dev_addr, vlan->real_dev_addr) &&
304 	    ether_addr_equal(vlandev->dev_addr, dev->dev_addr))
305 		dev_uc_del(dev, vlandev->dev_addr);
306 
307 	/* vlan address was equal to the old address and is different from
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_add(dev, vlandev->dev_addr);
312 
313 out:
314 	ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
315 }
316 
317 static void vlan_transfer_features(struct net_device *dev,
318 				   struct net_device *vlandev)
319 {
320 	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
321 
322 	vlandev->gso_max_size = dev->gso_max_size;
323 	vlandev->gso_max_segs = dev->gso_max_segs;
324 
325 	if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
326 		vlandev->hard_header_len = dev->hard_header_len;
327 	else
328 		vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
329 
330 #if IS_ENABLED(CONFIG_FCOE)
331 	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
332 #endif
333 
334 	vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
335 	vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
336 	vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
337 
338 	netdev_update_features(vlandev);
339 }
340 
341 static int __vlan_device_event(struct net_device *dev, unsigned long event)
342 {
343 	int err = 0;
344 
345 	switch (event) {
346 	case NETDEV_CHANGENAME:
347 		vlan_proc_rem_dev(dev);
348 		err = vlan_proc_add_dev(dev);
349 		break;
350 	case NETDEV_REGISTER:
351 		err = vlan_proc_add_dev(dev);
352 		break;
353 	case NETDEV_UNREGISTER:
354 		vlan_proc_rem_dev(dev);
355 		break;
356 	}
357 
358 	return err;
359 }
360 
361 static int vlan_device_event(struct notifier_block *unused, unsigned long event,
362 			     void *ptr)
363 {
364 	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
365 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
366 	struct vlan_group *grp;
367 	struct vlan_info *vlan_info;
368 	int i, flgs;
369 	struct net_device *vlandev;
370 	struct vlan_dev_priv *vlan;
371 	bool last = false;
372 	LIST_HEAD(list);
373 	int err;
374 
375 	if (is_vlan_dev(dev)) {
376 		int err = __vlan_device_event(dev, event);
377 
378 		if (err)
379 			return notifier_from_errno(err);
380 	}
381 
382 	if ((event == NETDEV_UP) &&
383 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
384 		pr_info("adding VLAN 0 to HW filter on device %s\n",
385 			dev->name);
386 		vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
387 	}
388 	if (event == NETDEV_DOWN &&
389 	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
390 		vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
391 
392 	vlan_info = rtnl_dereference(dev->vlan_info);
393 	if (!vlan_info)
394 		goto out;
395 	grp = &vlan_info->grp;
396 
397 	/* It is OK that we do not hold the group lock right now,
398 	 * as we run under the RTNL lock.
399 	 */
400 
401 	switch (event) {
402 	case NETDEV_CHANGE:
403 		/* Propagate real device state to vlan devices */
404 		vlan_group_for_each_dev(grp, i, vlandev)
405 			vlan_stacked_transfer_operstate(dev, vlandev,
406 							vlan_dev_priv(vlandev));
407 		break;
408 
409 	case NETDEV_CHANGEADDR:
410 		/* Adjust unicast filters on underlying device */
411 		vlan_group_for_each_dev(grp, i, vlandev) {
412 			flgs = vlandev->flags;
413 			if (!(flgs & IFF_UP))
414 				continue;
415 
416 			vlan_sync_address(dev, vlandev);
417 		}
418 		break;
419 
420 	case NETDEV_CHANGEMTU:
421 		vlan_group_for_each_dev(grp, i, vlandev) {
422 			if (vlandev->mtu <= dev->mtu)
423 				continue;
424 
425 			dev_set_mtu(vlandev, dev->mtu);
426 		}
427 		break;
428 
429 	case NETDEV_FEAT_CHANGE:
430 		/* Propagate device features to underlying device */
431 		vlan_group_for_each_dev(grp, i, vlandev)
432 			vlan_transfer_features(dev, vlandev);
433 		break;
434 
435 	case NETDEV_DOWN: {
436 		struct net_device *tmp;
437 		LIST_HEAD(close_list);
438 
439 		/* Put all VLANs for this dev in the down state too.  */
440 		vlan_group_for_each_dev(grp, i, vlandev) {
441 			flgs = vlandev->flags;
442 			if (!(flgs & IFF_UP))
443 				continue;
444 
445 			vlan = vlan_dev_priv(vlandev);
446 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
447 				list_add(&vlandev->close_list, &close_list);
448 		}
449 
450 		dev_close_many(&close_list, false);
451 
452 		list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
453 			vlan_stacked_transfer_operstate(dev, vlandev,
454 							vlan_dev_priv(vlandev));
455 			list_del_init(&vlandev->close_list);
456 		}
457 		list_del(&close_list);
458 		break;
459 	}
460 	case NETDEV_UP:
461 		/* Put all VLANs for this dev in the up state too.  */
462 		vlan_group_for_each_dev(grp, i, vlandev) {
463 			flgs = dev_get_flags(vlandev);
464 			if (flgs & IFF_UP)
465 				continue;
466 
467 			vlan = vlan_dev_priv(vlandev);
468 			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
469 				dev_change_flags(vlandev, flgs | IFF_UP,
470 						 extack);
471 			vlan_stacked_transfer_operstate(dev, vlandev, vlan);
472 		}
473 		break;
474 
475 	case NETDEV_UNREGISTER:
476 		/* twiddle thumbs on netns device moves */
477 		if (dev->reg_state != NETREG_UNREGISTERING)
478 			break;
479 
480 		vlan_group_for_each_dev(grp, i, vlandev) {
481 			/* removal of last vid destroys vlan_info, abort
482 			 * afterwards */
483 			if (vlan_info->nr_vids == 1)
484 				last = true;
485 
486 			unregister_vlan_dev(vlandev, &list);
487 			if (last)
488 				break;
489 		}
490 		unregister_netdevice_many(&list);
491 		break;
492 
493 	case NETDEV_PRE_TYPE_CHANGE:
494 		/* Forbid underlaying device to change its type. */
495 		if (vlan_uses_dev(dev))
496 			return NOTIFY_BAD;
497 		break;
498 
499 	case NETDEV_NOTIFY_PEERS:
500 	case NETDEV_BONDING_FAILOVER:
501 	case NETDEV_RESEND_IGMP:
502 		/* Propagate to vlan devices */
503 		vlan_group_for_each_dev(grp, i, vlandev)
504 			call_netdevice_notifiers(event, vlandev);
505 		break;
506 
507 	case NETDEV_CVLAN_FILTER_PUSH_INFO:
508 		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
509 		if (err)
510 			return notifier_from_errno(err);
511 		break;
512 
513 	case NETDEV_CVLAN_FILTER_DROP_INFO:
514 		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
515 		break;
516 
517 	case NETDEV_SVLAN_FILTER_PUSH_INFO:
518 		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
519 		if (err)
520 			return notifier_from_errno(err);
521 		break;
522 
523 	case NETDEV_SVLAN_FILTER_DROP_INFO:
524 		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
525 		break;
526 	}
527 
528 out:
529 	return NOTIFY_DONE;
530 }
531 
532 static struct notifier_block vlan_notifier_block __read_mostly = {
533 	.notifier_call = vlan_device_event,
534 };
535 
536 /*
537  *	VLAN IOCTL handler.
538  *	o execute requested action or pass command to the device driver
539  *   arg is really a struct vlan_ioctl_args __user *.
540  */
541 static int vlan_ioctl_handler(struct net *net, void __user *arg)
542 {
543 	int err;
544 	struct vlan_ioctl_args args;
545 	struct net_device *dev = NULL;
546 
547 	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
548 		return -EFAULT;
549 
550 	/* Null terminate this sucker, just in case. */
551 	args.device1[sizeof(args.device1) - 1] = 0;
552 	args.u.device2[sizeof(args.u.device2) - 1] = 0;
553 
554 	rtnl_lock();
555 
556 	switch (args.cmd) {
557 	case SET_VLAN_INGRESS_PRIORITY_CMD:
558 	case SET_VLAN_EGRESS_PRIORITY_CMD:
559 	case SET_VLAN_FLAG_CMD:
560 	case ADD_VLAN_CMD:
561 	case DEL_VLAN_CMD:
562 	case GET_VLAN_REALDEV_NAME_CMD:
563 	case GET_VLAN_VID_CMD:
564 		err = -ENODEV;
565 		dev = __dev_get_by_name(net, args.device1);
566 		if (!dev)
567 			goto out;
568 
569 		err = -EINVAL;
570 		if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
571 			goto out;
572 	}
573 
574 	switch (args.cmd) {
575 	case SET_VLAN_INGRESS_PRIORITY_CMD:
576 		err = -EPERM;
577 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
578 			break;
579 		vlan_dev_set_ingress_priority(dev,
580 					      args.u.skb_priority,
581 					      args.vlan_qos);
582 		err = 0;
583 		break;
584 
585 	case SET_VLAN_EGRESS_PRIORITY_CMD:
586 		err = -EPERM;
587 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
588 			break;
589 		err = vlan_dev_set_egress_priority(dev,
590 						   args.u.skb_priority,
591 						   args.vlan_qos);
592 		break;
593 
594 	case SET_VLAN_FLAG_CMD:
595 		err = -EPERM;
596 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
597 			break;
598 		err = vlan_dev_change_flags(dev,
599 					    args.vlan_qos ? args.u.flag : 0,
600 					    args.u.flag);
601 		break;
602 
603 	case SET_VLAN_NAME_TYPE_CMD:
604 		err = -EPERM;
605 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
606 			break;
607 		if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
608 			struct vlan_net *vn;
609 
610 			vn = net_generic(net, vlan_net_id);
611 			vn->name_type = args.u.name_type;
612 			err = 0;
613 		} else {
614 			err = -EINVAL;
615 		}
616 		break;
617 
618 	case ADD_VLAN_CMD:
619 		err = -EPERM;
620 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
621 			break;
622 		err = register_vlan_device(dev, args.u.VID);
623 		break;
624 
625 	case DEL_VLAN_CMD:
626 		err = -EPERM;
627 		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
628 			break;
629 		unregister_vlan_dev(dev, NULL);
630 		err = 0;
631 		break;
632 
633 	case GET_VLAN_REALDEV_NAME_CMD:
634 		err = 0;
635 		vlan_dev_get_realdev_name(dev, args.u.device2);
636 		if (copy_to_user(arg, &args,
637 				 sizeof(struct vlan_ioctl_args)))
638 			err = -EFAULT;
639 		break;
640 
641 	case GET_VLAN_VID_CMD:
642 		err = 0;
643 		args.u.VID = vlan_dev_vlan_id(dev);
644 		if (copy_to_user(arg, &args,
645 				 sizeof(struct vlan_ioctl_args)))
646 		      err = -EFAULT;
647 		break;
648 
649 	default:
650 		err = -EOPNOTSUPP;
651 		break;
652 	}
653 out:
654 	rtnl_unlock();
655 	return err;
656 }
657 
658 static int __net_init vlan_init_net(struct net *net)
659 {
660 	struct vlan_net *vn = net_generic(net, vlan_net_id);
661 	int err;
662 
663 	vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
664 
665 	err = vlan_proc_init(net);
666 
667 	return err;
668 }
669 
670 static void __net_exit vlan_exit_net(struct net *net)
671 {
672 	vlan_proc_cleanup(net);
673 }
674 
675 static struct pernet_operations vlan_net_ops = {
676 	.init = vlan_init_net,
677 	.exit = vlan_exit_net,
678 	.id   = &vlan_net_id,
679 	.size = sizeof(struct vlan_net),
680 };
681 
682 static int __init vlan_proto_init(void)
683 {
684 	int err;
685 
686 	pr_info("%s v%s\n", vlan_fullname, vlan_version);
687 
688 	err = register_pernet_subsys(&vlan_net_ops);
689 	if (err < 0)
690 		goto err0;
691 
692 	err = register_netdevice_notifier(&vlan_notifier_block);
693 	if (err < 0)
694 		goto err2;
695 
696 	err = vlan_gvrp_init();
697 	if (err < 0)
698 		goto err3;
699 
700 	err = vlan_mvrp_init();
701 	if (err < 0)
702 		goto err4;
703 
704 	err = vlan_netlink_init();
705 	if (err < 0)
706 		goto err5;
707 
708 	vlan_ioctl_set(vlan_ioctl_handler);
709 	return 0;
710 
711 err5:
712 	vlan_mvrp_uninit();
713 err4:
714 	vlan_gvrp_uninit();
715 err3:
716 	unregister_netdevice_notifier(&vlan_notifier_block);
717 err2:
718 	unregister_pernet_subsys(&vlan_net_ops);
719 err0:
720 	return err;
721 }
722 
723 static void __exit vlan_cleanup_module(void)
724 {
725 	vlan_ioctl_set(NULL);
726 
727 	vlan_netlink_fini();
728 
729 	unregister_netdevice_notifier(&vlan_notifier_block);
730 
731 	unregister_pernet_subsys(&vlan_net_ops);
732 	rcu_barrier(); /* Wait for completion of call_rcu()'s */
733 
734 	vlan_mvrp_uninit();
735 	vlan_gvrp_uninit();
736 }
737 
738 module_init(vlan_proto_init);
739 module_exit(vlan_cleanup_module);
740 
741 MODULE_LICENSE("GPL");
742 MODULE_VERSION(DRV_VERSION);
743