Linux Audio

Check our new training course

Loading...
v3.1
 
  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
 47int vlan_net_id __read_mostly;
 48
 49const char vlan_fullname[] = "802.1Q VLAN Support";
 50const char vlan_version[] = DRV_VERSION;
 51
 52/* End of global variables definitions. */
 53
 54static void vlan_group_free(struct vlan_group *grp)
 55{
 56	int i;
 57
 58	for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
 59		kfree(grp->vlan_devices_arrays[i]);
 60	kfree(grp);
 61}
 62
 63static struct vlan_group *vlan_group_alloc(struct net_device *real_dev)
 64{
 65	struct vlan_group *grp;
 66
 67	grp = kzalloc(sizeof(struct vlan_group), GFP_KERNEL);
 68	if (!grp)
 69		return NULL;
 70
 71	grp->real_dev = real_dev;
 72	return grp;
 73}
 74
 75static int vlan_group_prealloc_vid(struct vlan_group *vg, u16 vlan_id)
 76{
 77	struct net_device **array;
 
 78	unsigned int size;
 
 79
 80	ASSERT_RTNL();
 81
 82	array = vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN];
 
 
 
 
 
 83	if (array != NULL)
 84		return 0;
 85
 86	size = sizeof(struct net_device *) * VLAN_GROUP_ARRAY_PART_LEN;
 87	array = kzalloc(size, GFP_KERNEL);
 88	if (array == NULL)
 89		return -ENOBUFS;
 90
 91	vg->vlan_devices_arrays[vlan_id / VLAN_GROUP_ARRAY_PART_LEN] = array;
 
 
 
 92	return 0;
 93}
 94
 95static void vlan_rcu_free(struct rcu_head *rcu)
 
 
 96{
 97	vlan_group_free(container_of(rcu, struct vlan_group, rcu));
 
 98}
 99
100void unregister_vlan_dev(struct net_device *dev, struct list_head *head)
101{
102	struct vlan_dev_info *vlan = vlan_dev_info(dev);
103	struct net_device *real_dev = vlan->real_dev;
104	const struct net_device_ops *ops = real_dev->netdev_ops;
105	struct vlan_group *grp;
106	u16 vlan_id = vlan->vlan_id;
107
108	ASSERT_RTNL();
109
110	grp = rtnl_dereference(real_dev->vlgrp);
111	BUG_ON(!grp);
112
113	/* Take it out of our own structures, but be sure to interlock with
114	 * HW accelerating devices or SW vlan input packet processing if
115	 * VLAN is not 0 (leave it there for 802.1p).
116	 */
117	if (vlan_id && (real_dev->features & NETIF_F_HW_VLAN_FILTER))
118		ops->ndo_vlan_rx_kill_vid(real_dev, vlan_id);
119
120	grp->nr_vlans--;
121
 
 
122	if (vlan->flags & VLAN_FLAG_GVRP)
123		vlan_gvrp_request_leave(dev);
124
125	vlan_group_set_device(grp, vlan_id, NULL);
 
 
126	/* Because unregister_netdevice_queue() makes sure at least one rcu
127	 * grace period is respected before device freeing,
128	 * we dont need to call synchronize_net() here.
129	 */
130	unregister_netdevice_queue(dev, head);
131
132	/* If the group is now empty, kill off the group. */
133	if (grp->nr_vlans == 0) {
134		vlan_gvrp_uninit_applicant(real_dev);
135
136		rcu_assign_pointer(real_dev->vlgrp, NULL);
137
138		/* Free the group, after all cpu's are done. */
139		call_rcu(&grp->rcu, vlan_rcu_free);
140	}
141
142	/* Get rid of the vlan's reference to real_dev */
143	dev_put(real_dev);
144}
145
146int vlan_check_real_dev(struct net_device *real_dev, u16 vlan_id)
 
 
147{
148	const char *name = real_dev->name;
149	const struct net_device_ops *ops = real_dev->netdev_ops;
150
151	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
152		pr_info("VLANs not supported on %s\n", name);
 
153		return -EOPNOTSUPP;
154	}
155
156	if ((real_dev->features & NETIF_F_HW_VLAN_FILTER) &&
157	    (!ops->ndo_vlan_rx_add_vid || !ops->ndo_vlan_rx_kill_vid)) {
158		pr_info("Device %s has buggy VLAN hw accel\n", name);
159		return -EOPNOTSUPP;
160	}
161
162	if (vlan_find_dev(real_dev, vlan_id) != NULL)
163		return -EEXIST;
 
164
165	return 0;
166}
167
168int register_vlan_dev(struct net_device *dev)
169{
170	struct vlan_dev_info *vlan = vlan_dev_info(dev);
171	struct net_device *real_dev = vlan->real_dev;
172	const struct net_device_ops *ops = real_dev->netdev_ops;
173	u16 vlan_id = vlan->vlan_id;
174	struct vlan_group *grp, *ngrp = NULL;
 
175	int err;
176
177	grp = rtnl_dereference(real_dev->vlgrp);
178	if (!grp) {
179		ngrp = grp = vlan_group_alloc(real_dev);
180		if (!grp)
181			return -ENOBUFS;
 
 
 
 
 
182		err = vlan_gvrp_init_applicant(real_dev);
183		if (err < 0)
184			goto out_free_group;
 
 
 
185	}
186
187	err = vlan_group_prealloc_vid(grp, vlan_id);
188	if (err < 0)
189		goto out_uninit_applicant;
190
191	err = register_netdevice(dev);
192	if (err < 0)
193		goto out_uninit_applicant;
194
195	/* Account for reference in struct vlan_dev_info */
196	dev_hold(real_dev);
 
197
198	netif_stacked_transfer_operstate(real_dev, dev);
199	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
200
201	/* So, got the sucker initialized, now lets place
202	 * it into our local structure.
203	 */
204	vlan_group_set_device(grp, vlan_id, dev);
205	grp->nr_vlans++;
206
207	if (ngrp) {
208		rcu_assign_pointer(real_dev->vlgrp, ngrp);
209	}
210	if (real_dev->features & NETIF_F_HW_VLAN_FILTER)
211		ops->ndo_vlan_rx_add_vid(real_dev, vlan_id);
212
213	return 0;
214
215out_uninit_applicant:
216	if (ngrp)
 
 
 
 
 
217		vlan_gvrp_uninit_applicant(real_dev);
218out_free_group:
219	if (ngrp) {
220		/* Free the group, after all cpu's are done. */
221		call_rcu(&ngrp->rcu, vlan_rcu_free);
222	}
223	return err;
224}
225
226/*  Attach a VLAN device to a mac address (ie Ethernet Card).
227 *  Returns 0 if the device was created or a negative error code otherwise.
228 */
229static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
230{
231	struct net_device *new_dev;
 
232	struct net *net = dev_net(real_dev);
233	struct vlan_net *vn = net_generic(net, vlan_net_id);
234	char name[IFNAMSIZ];
235	int err;
236
237	if (vlan_id >= VLAN_VID_MASK)
238		return -ERANGE;
239
240	err = vlan_check_real_dev(real_dev, vlan_id);
 
241	if (err < 0)
242		return err;
243
244	/* Gotta set up the fields for the device. */
245	switch (vn->name_type) {
246	case VLAN_NAME_TYPE_RAW_PLUS_VID:
247		/* name will look like:	 eth1.0005 */
248		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
249		break;
250	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
251		/* Put our vlan.VID in the name.
252		 * Name will look like:	 vlan5
253		 */
254		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
255		break;
256	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
257		/* Put our vlan.VID in the name.
258		 * Name will look like:	 eth0.5
259		 */
260		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
261		break;
262	case VLAN_NAME_TYPE_PLUS_VID:
263		/* Put our vlan.VID in the name.
264		 * Name will look like:	 vlan0005
265		 */
266	default:
267		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
268	}
269
270	new_dev = alloc_netdev(sizeof(struct vlan_dev_info), name, vlan_setup);
 
271
272	if (new_dev == NULL)
273		return -ENOBUFS;
274
275	dev_net_set(new_dev, net);
276	/* need 4 bytes for extra VLAN header info,
277	 * hope the underlying device can handle it.
278	 */
279	new_dev->mtu = real_dev->mtu;
280
281	vlan_dev_info(new_dev)->vlan_id = vlan_id;
282	vlan_dev_info(new_dev)->real_dev = real_dev;
283	vlan_dev_info(new_dev)->dent = NULL;
284	vlan_dev_info(new_dev)->flags = VLAN_FLAG_REORDER_HDR;
 
 
285
286	new_dev->rtnl_link_ops = &vlan_link_ops;
287	err = register_vlan_dev(new_dev);
288	if (err < 0)
289		goto out_free_newdev;
290
291	return 0;
292
293out_free_newdev:
294	free_netdev(new_dev);
295	return err;
296}
297
298static void vlan_sync_address(struct net_device *dev,
299			      struct net_device *vlandev)
300{
301	struct vlan_dev_info *vlan = vlan_dev_info(vlandev);
302
303	/* May be called without an actual change */
304	if (!compare_ether_addr(vlan->real_dev_addr, dev->dev_addr))
305		return;
306
 
 
 
 
307	/* vlan address was different from the old address and is equal to
308	 * the new address */
309	if (compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
310	    !compare_ether_addr(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 (!compare_ether_addr(vlandev->dev_addr, vlan->real_dev_addr) &&
316	    compare_ether_addr(vlandev->dev_addr, dev->dev_addr))
317		dev_uc_add(dev, vlandev->dev_addr);
318
319	memcpy(vlan->real_dev_addr, dev->dev_addr, ETH_ALEN);
 
320}
321
322static void vlan_transfer_features(struct net_device *dev,
323				   struct net_device *vlandev)
324{
325	vlandev->gso_max_size = dev->gso_max_size;
 
 
326
327	if (dev->features & NETIF_F_HW_VLAN_TX)
328		vlandev->hard_header_len = dev->hard_header_len;
329	else
330		vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
331
332#if defined(CONFIG_FCOE) || defined(CONFIG_FCOE_MODULE)
333	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
334#endif
335
 
 
 
 
336	netdev_update_features(vlandev);
337}
338
339static void __vlan_device_event(struct net_device *dev, unsigned long event)
340{
 
 
341	switch (event) {
342	case NETDEV_CHANGENAME:
343		vlan_proc_rem_dev(dev);
344		if (vlan_proc_add_dev(dev) < 0)
345			pr_warn("failed to change proc name for %s\n",
346				dev->name);
347		break;
348	case NETDEV_REGISTER:
349		if (vlan_proc_add_dev(dev) < 0)
350			pr_warn("failed to add proc entry for %s\n", dev->name);
351		break;
352	case NETDEV_UNREGISTER:
353		vlan_proc_rem_dev(dev);
354		break;
355	}
 
 
356}
357
358static int vlan_device_event(struct notifier_block *unused, unsigned long event,
359			     void *ptr)
360{
361	struct net_device *dev = ptr;
 
362	struct vlan_group *grp;
 
363	int i, flgs;
364	struct net_device *vlandev;
365	struct vlan_dev_info *vlan;
 
366	LIST_HEAD(list);
 
367
368	if (is_vlan_dev(dev))
369		__vlan_device_event(dev, event);
 
 
 
 
370
371	if ((event == NETDEV_UP) &&
372	    (dev->features & NETIF_F_HW_VLAN_FILTER) &&
373	    dev->netdev_ops->ndo_vlan_rx_add_vid) {
374		pr_info("adding VLAN 0 to HW filter on device %s\n",
375			dev->name);
376		dev->netdev_ops->ndo_vlan_rx_add_vid(dev, 0);
377	}
 
 
 
378
379	grp = rtnl_dereference(dev->vlgrp);
380	if (!grp)
381		goto out;
 
382
383	/* It is OK that we do not hold the group lock right now,
384	 * as we run under the RTNL lock.
385	 */
386
387	switch (event) {
388	case NETDEV_CHANGE:
389		/* Propagate real device state to vlan devices */
390		for (i = 0; i < VLAN_N_VID; i++) {
391			vlandev = vlan_group_get_device(grp, i);
392			if (!vlandev)
393				continue;
394
395			netif_stacked_transfer_operstate(dev, vlandev);
396		}
397		break;
398
399	case NETDEV_CHANGEADDR:
400		/* Adjust unicast filters on underlying device */
401		for (i = 0; i < VLAN_N_VID; i++) {
402			vlandev = vlan_group_get_device(grp, i);
403			if (!vlandev)
404				continue;
405
406			flgs = vlandev->flags;
407			if (!(flgs & IFF_UP))
408				continue;
409
410			vlan_sync_address(dev, vlandev);
411		}
412		break;
413
414	case NETDEV_CHANGEMTU:
415		for (i = 0; i < VLAN_N_VID; i++) {
416			vlandev = vlan_group_get_device(grp, i);
417			if (!vlandev)
418				continue;
419
420			if (vlandev->mtu <= dev->mtu)
421				continue;
422
423			dev_set_mtu(vlandev, dev->mtu);
424		}
425		break;
426
427	case NETDEV_FEAT_CHANGE:
428		/* Propagate device features to underlying device */
429		for (i = 0; i < VLAN_N_VID; i++) {
430			vlandev = vlan_group_get_device(grp, i);
431			if (!vlandev)
432				continue;
433
434			vlan_transfer_features(dev, vlandev);
435		}
436
437		break;
438
439	case NETDEV_DOWN:
440		/* Put all VLANs for this dev in the down state too.  */
441		for (i = 0; i < VLAN_N_VID; i++) {
442			vlandev = vlan_group_get_device(grp, i);
443			if (!vlandev)
444				continue;
445
 
 
446			flgs = vlandev->flags;
447			if (!(flgs & IFF_UP))
448				continue;
449
450			vlan = vlan_dev_info(vlandev);
451			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
452				dev_change_flags(vlandev, flgs & ~IFF_UP);
453			netif_stacked_transfer_operstate(dev, vlandev);
454		}
455		break;
456
 
 
 
 
 
 
 
 
 
 
457	case NETDEV_UP:
458		/* Put all VLANs for this dev in the up state too.  */
459		for (i = 0; i < VLAN_N_VID; i++) {
460			vlandev = vlan_group_get_device(grp, i);
461			if (!vlandev)
462				continue;
463
464			flgs = vlandev->flags;
465			if (flgs & IFF_UP)
466				continue;
467
468			vlan = vlan_dev_info(vlandev);
469			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
470				dev_change_flags(vlandev, flgs | IFF_UP);
471			netif_stacked_transfer_operstate(dev, vlandev);
 
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		for (i = 0; i < VLAN_N_VID; i++) {
481			vlandev = vlan_group_get_device(grp, i);
482			if (!vlandev)
483				continue;
484
485			/* unregistration of last vlan destroys group, abort
486			 * afterwards */
487			if (grp->nr_vlans == 1)
488				i = VLAN_N_VID;
489
490			unregister_vlan_dev(vlandev, &list);
 
 
491		}
492		unregister_netdevice_many(&list);
493		break;
494
495	case NETDEV_PRE_TYPE_CHANGE:
496		/* Forbid underlaying device to change its type. */
497		return NOTIFY_BAD;
 
 
498
499	case NETDEV_NOTIFY_PEERS:
500	case NETDEV_BONDING_FAILOVER:
 
501		/* Propagate to vlan devices */
502		for (i = 0; i < VLAN_N_VID; i++) {
503			vlandev = vlan_group_get_device(grp, i);
504			if (!vlandev)
505				continue;
506
507			call_netdevice_notifiers(event, vlandev);
508		}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
509		break;
510	}
511
512out:
513	return NOTIFY_DONE;
514}
515
516static struct notifier_block vlan_notifier_block __read_mostly = {
517	.notifier_call = vlan_device_event,
518};
519
520/*
521 *	VLAN IOCTL handler.
522 *	o execute requested action or pass command to the device driver
523 *   arg is really a struct vlan_ioctl_args __user *.
524 */
525static int vlan_ioctl_handler(struct net *net, void __user *arg)
526{
527	int err;
528	struct vlan_ioctl_args args;
529	struct net_device *dev = NULL;
530
531	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
532		return -EFAULT;
533
534	/* Null terminate this sucker, just in case. */
535	args.device1[23] = 0;
536	args.u.device2[23] = 0;
537
538	rtnl_lock();
539
540	switch (args.cmd) {
541	case SET_VLAN_INGRESS_PRIORITY_CMD:
542	case SET_VLAN_EGRESS_PRIORITY_CMD:
543	case SET_VLAN_FLAG_CMD:
544	case ADD_VLAN_CMD:
545	case DEL_VLAN_CMD:
546	case GET_VLAN_REALDEV_NAME_CMD:
547	case GET_VLAN_VID_CMD:
548		err = -ENODEV;
549		dev = __dev_get_by_name(net, args.device1);
550		if (!dev)
551			goto out;
552
553		err = -EINVAL;
554		if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
555			goto out;
556	}
557
558	switch (args.cmd) {
559	case SET_VLAN_INGRESS_PRIORITY_CMD:
560		err = -EPERM;
561		if (!capable(CAP_NET_ADMIN))
562			break;
563		vlan_dev_set_ingress_priority(dev,
564					      args.u.skb_priority,
565					      args.vlan_qos);
566		err = 0;
567		break;
568
569	case SET_VLAN_EGRESS_PRIORITY_CMD:
570		err = -EPERM;
571		if (!capable(CAP_NET_ADMIN))
572			break;
573		err = vlan_dev_set_egress_priority(dev,
574						   args.u.skb_priority,
575						   args.vlan_qos);
576		break;
577
578	case SET_VLAN_FLAG_CMD:
579		err = -EPERM;
580		if (!capable(CAP_NET_ADMIN))
581			break;
582		err = vlan_dev_change_flags(dev,
583					    args.vlan_qos ? args.u.flag : 0,
584					    args.u.flag);
585		break;
586
587	case SET_VLAN_NAME_TYPE_CMD:
588		err = -EPERM;
589		if (!capable(CAP_NET_ADMIN))
590			break;
591		if ((args.u.name_type >= 0) &&
592		    (args.u.name_type < VLAN_NAME_TYPE_HIGHEST)) {
593			struct vlan_net *vn;
594
595			vn = net_generic(net, vlan_net_id);
596			vn->name_type = args.u.name_type;
597			err = 0;
598		} else {
599			err = -EINVAL;
600		}
601		break;
602
603	case ADD_VLAN_CMD:
604		err = -EPERM;
605		if (!capable(CAP_NET_ADMIN))
606			break;
607		err = register_vlan_device(dev, args.u.VID);
608		break;
609
610	case DEL_VLAN_CMD:
611		err = -EPERM;
612		if (!capable(CAP_NET_ADMIN))
613			break;
614		unregister_vlan_dev(dev, NULL);
615		err = 0;
616		break;
617
618	case GET_VLAN_REALDEV_NAME_CMD:
619		err = 0;
620		vlan_dev_get_realdev_name(dev, args.u.device2);
 
621		if (copy_to_user(arg, &args,
622				 sizeof(struct vlan_ioctl_args)))
623			err = -EFAULT;
624		break;
625
626	case GET_VLAN_VID_CMD:
627		err = 0;
628		args.u.VID = vlan_dev_vlan_id(dev);
629		if (copy_to_user(arg, &args,
630				 sizeof(struct vlan_ioctl_args)))
631		      err = -EFAULT;
632		break;
633
634	default:
635		err = -EOPNOTSUPP;
636		break;
637	}
638out:
639	rtnl_unlock();
640	return err;
641}
642
643static int __net_init vlan_init_net(struct net *net)
644{
645	struct vlan_net *vn = net_generic(net, vlan_net_id);
646	int err;
647
648	vn->name_type = VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD;
649
650	err = vlan_proc_init(net);
651
652	return err;
653}
654
655static void __net_exit vlan_exit_net(struct net *net)
656{
657	vlan_proc_cleanup(net);
658}
659
660static struct pernet_operations vlan_net_ops = {
661	.init = vlan_init_net,
662	.exit = vlan_exit_net,
663	.id   = &vlan_net_id,
664	.size = sizeof(struct vlan_net),
665};
666
667static int __init vlan_proto_init(void)
668{
669	int err;
670
671	pr_info("%s v%s\n", vlan_fullname, vlan_version);
672
673	err = register_pernet_subsys(&vlan_net_ops);
674	if (err < 0)
675		goto err0;
676
677	err = register_netdevice_notifier(&vlan_notifier_block);
678	if (err < 0)
679		goto err2;
680
681	err = vlan_gvrp_init();
682	if (err < 0)
683		goto err3;
684
685	err = vlan_netlink_init();
686	if (err < 0)
687		goto err4;
688
 
 
 
 
689	vlan_ioctl_set(vlan_ioctl_handler);
690	return 0;
691
 
 
692err4:
693	vlan_gvrp_uninit();
694err3:
695	unregister_netdevice_notifier(&vlan_notifier_block);
696err2:
697	unregister_pernet_subsys(&vlan_net_ops);
698err0:
699	return err;
700}
701
702static void __exit vlan_cleanup_module(void)
703{
704	vlan_ioctl_set(NULL);
 
705	vlan_netlink_fini();
706
707	unregister_netdevice_notifier(&vlan_notifier_block);
708
709	unregister_pernet_subsys(&vlan_net_ops);
710	rcu_barrier(); /* Wait for completion of call_rcu()'s */
711
 
712	vlan_gvrp_uninit();
713}
714
715module_init(vlan_proto_init);
716module_exit(vlan_cleanup_module);
717
 
718MODULE_LICENSE("GPL");
719MODULE_VERSION(DRV_VERSION);
v6.8
  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
 43unsigned int vlan_net_id __read_mostly;
 44
 45const char vlan_fullname[] = "802.1Q VLAN Support";
 46const char vlan_version[] = DRV_VERSION;
 47
 48/* End of global variables definitions. */
 49
 50static 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
 81static 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
 89void 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
128int vlan_check_real_dev(struct net_device *real_dev,
129			__be16 protocol, u16 vlan_id,
130			struct netlink_ext_ack *extack)
131{
132	const char *name = real_dev->name;
 
133
134	if (real_dev->features & NETIF_F_VLAN_CHALLENGED) {
135		pr_info("VLANs not supported on %s\n", name);
136		NL_SET_ERR_MSG_MOD(extack, "VLANs not supported on device");
137		return -EOPNOTSUPP;
138	}
139
140	if (vlan_find_dev(real_dev, protocol, vlan_id) != NULL) {
141		NL_SET_ERR_MSG_MOD(extack, "VLAN device already exists");
 
 
 
 
 
142		return -EEXIST;
143	}
144
145	return 0;
146}
147
148int register_vlan_dev(struct net_device *dev, struct netlink_ext_ack *extack)
149{
150	struct vlan_dev_priv *vlan = vlan_dev_priv(dev);
151	struct net_device *real_dev = vlan->real_dev;
 
152	u16 vlan_id = vlan->vlan_id;
153	struct vlan_info *vlan_info;
154	struct vlan_group *grp;
155	int err;
156
157	err = vlan_vid_add(real_dev, vlan->vlan_proto, vlan_id);
158	if (err)
159		return err;
160
161	vlan_info = rtnl_dereference(real_dev->vlan_info);
162	/* vlan_info should be there now. vlan_vid_add took care of it */
163	BUG_ON(!vlan_info);
164
165	grp = &vlan_info->grp;
166	if (grp->nr_vlan_devs == 0) {
167		err = vlan_gvrp_init_applicant(real_dev);
168		if (err < 0)
169			goto out_vid_del;
170		err = vlan_mvrp_init_applicant(real_dev);
171		if (err < 0)
172			goto out_uninit_gvrp;
173	}
174
175	err = vlan_group_prealloc_vid(grp, vlan->vlan_proto, vlan_id);
176	if (err < 0)
177		goto out_uninit_mvrp;
178
179	err = register_netdevice(dev);
180	if (err < 0)
181		goto out_uninit_mvrp;
182
183	err = netdev_upper_dev_link(real_dev, dev, extack);
184	if (err)
185		goto out_unregister_netdev;
186
187	vlan_stacked_transfer_operstate(real_dev, dev, vlan);
188	linkwatch_fire_event(dev); /* _MUST_ call rfc2863_policy() */
189
190	/* So, got the sucker initialized, now lets place
191	 * it into our local structure.
192	 */
193	vlan_group_set_device(grp, vlan->vlan_proto, vlan_id, dev);
194	grp->nr_vlan_devs++;
 
 
 
 
 
 
195
196	return 0;
197
198out_unregister_netdev:
199	unregister_netdevice(dev);
200out_uninit_mvrp:
201	if (grp->nr_vlan_devs == 0)
202		vlan_mvrp_uninit_applicant(real_dev);
203out_uninit_gvrp:
204	if (grp->nr_vlan_devs == 0)
205		vlan_gvrp_uninit_applicant(real_dev);
206out_vid_del:
207	vlan_vid_del(real_dev, vlan->vlan_proto, vlan_id);
 
 
 
208	return err;
209}
210
211/*  Attach a VLAN device to a mac address (ie Ethernet Card).
212 *  Returns 0 if the device was created or a negative error code otherwise.
213 */
214static int register_vlan_device(struct net_device *real_dev, u16 vlan_id)
215{
216	struct net_device *new_dev;
217	struct vlan_dev_priv *vlan;
218	struct net *net = dev_net(real_dev);
219	struct vlan_net *vn = net_generic(net, vlan_net_id);
220	char name[IFNAMSIZ];
221	int err;
222
223	if (vlan_id >= VLAN_VID_MASK)
224		return -ERANGE;
225
226	err = vlan_check_real_dev(real_dev, htons(ETH_P_8021Q), vlan_id,
227				  NULL);
228	if (err < 0)
229		return err;
230
231	/* Gotta set up the fields for the device. */
232	switch (vn->name_type) {
233	case VLAN_NAME_TYPE_RAW_PLUS_VID:
234		/* name will look like:	 eth1.0005 */
235		snprintf(name, IFNAMSIZ, "%s.%.4i", real_dev->name, vlan_id);
236		break;
237	case VLAN_NAME_TYPE_PLUS_VID_NO_PAD:
238		/* Put our vlan.VID in the name.
239		 * Name will look like:	 vlan5
240		 */
241		snprintf(name, IFNAMSIZ, "vlan%i", vlan_id);
242		break;
243	case VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD:
244		/* Put our vlan.VID in the name.
245		 * Name will look like:	 eth0.5
246		 */
247		snprintf(name, IFNAMSIZ, "%s.%i", real_dev->name, vlan_id);
248		break;
249	case VLAN_NAME_TYPE_PLUS_VID:
250		/* Put our vlan.VID in the name.
251		 * Name will look like:	 vlan0005
252		 */
253	default:
254		snprintf(name, IFNAMSIZ, "vlan%.4i", vlan_id);
255	}
256
257	new_dev = alloc_netdev(sizeof(struct vlan_dev_priv), name,
258			       NET_NAME_UNKNOWN, vlan_setup);
259
260	if (new_dev == NULL)
261		return -ENOBUFS;
262
263	dev_net_set(new_dev, net);
264	/* need 4 bytes for extra VLAN header info,
265	 * hope the underlying device can handle it.
266	 */
267	new_dev->mtu = real_dev->mtu;
268
269	vlan = vlan_dev_priv(new_dev);
270	vlan->vlan_proto = htons(ETH_P_8021Q);
271	vlan->vlan_id = vlan_id;
272	vlan->real_dev = real_dev;
273	vlan->dent = NULL;
274	vlan->flags = VLAN_FLAG_REORDER_HDR;
275
276	new_dev->rtnl_link_ops = &vlan_link_ops;
277	err = register_vlan_dev(new_dev, NULL);
278	if (err < 0)
279		goto out_free_newdev;
280
281	return 0;
282
283out_free_newdev:
284	free_netdev(new_dev);
285	return err;
286}
287
288static 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
313out:
314	ether_addr_copy(vlan->real_dev_addr, dev->dev_addr);
315}
316
317static 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	netif_inherit_tso_max(vlandev, dev);
323
324	if (vlan_hw_offload_capable(dev->features, vlan->vlan_proto))
325		vlandev->hard_header_len = dev->hard_header_len;
326	else
327		vlandev->hard_header_len = dev->hard_header_len + VLAN_HLEN;
328
329#if IS_ENABLED(CONFIG_FCOE)
330	vlandev->fcoe_ddp_xid = dev->fcoe_ddp_xid;
331#endif
332
333	vlandev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
334	vlandev->priv_flags |= (vlan->real_dev->priv_flags & IFF_XMIT_DST_RELEASE);
335	vlandev->hw_enc_features = vlan_tnl_features(vlan->real_dev);
336
337	netdev_update_features(vlandev);
338}
339
340static int __vlan_device_event(struct net_device *dev, unsigned long event)
341{
342	int err = 0;
343
344	switch (event) {
345	case NETDEV_CHANGENAME:
346		vlan_proc_rem_dev(dev);
347		err = vlan_proc_add_dev(dev);
 
 
348		break;
349	case NETDEV_REGISTER:
350		err = vlan_proc_add_dev(dev);
 
351		break;
352	case NETDEV_UNREGISTER:
353		vlan_proc_rem_dev(dev);
354		break;
355	}
356
357	return err;
358}
359
360static int vlan_device_event(struct notifier_block *unused, unsigned long event,
361			     void *ptr)
362{
363	struct netlink_ext_ack *extack = netdev_notifier_info_to_extack(ptr);
364	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
365	struct vlan_group *grp;
366	struct vlan_info *vlan_info;
367	int i, flgs;
368	struct net_device *vlandev;
369	struct vlan_dev_priv *vlan;
370	bool last = false;
371	LIST_HEAD(list);
372	int err;
373
374	if (is_vlan_dev(dev)) {
375		int err = __vlan_device_event(dev, event);
376
377		if (err)
378			return notifier_from_errno(err);
379	}
380
381	if ((event == NETDEV_UP) &&
382	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
 
383		pr_info("adding VLAN 0 to HW filter on device %s\n",
384			dev->name);
385		vlan_vid_add(dev, htons(ETH_P_8021Q), 0);
386	}
387	if (event == NETDEV_DOWN &&
388	    (dev->features & NETIF_F_HW_VLAN_CTAG_FILTER))
389		vlan_vid_del(dev, htons(ETH_P_8021Q), 0);
390
391	vlan_info = rtnl_dereference(dev->vlan_info);
392	if (!vlan_info)
393		goto out;
394	grp = &vlan_info->grp;
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		vlan_group_for_each_dev(grp, i, vlandev)
404			vlan_stacked_transfer_operstate(dev, vlandev,
405							vlan_dev_priv(vlandev));
 
 
 
 
406		break;
407
408	case NETDEV_CHANGEADDR:
409		/* Adjust unicast filters on underlying device */
410		vlan_group_for_each_dev(grp, i, vlandev) {
 
 
 
 
411			flgs = vlandev->flags;
412			if (!(flgs & IFF_UP))
413				continue;
414
415			vlan_sync_address(dev, vlandev);
416		}
417		break;
418
419	case NETDEV_CHANGEMTU:
420		vlan_group_for_each_dev(grp, i, vlandev) {
 
 
 
 
421			if (vlandev->mtu <= dev->mtu)
422				continue;
423
424			dev_set_mtu(vlandev, dev->mtu);
425		}
426		break;
427
428	case NETDEV_FEAT_CHANGE:
429		/* Propagate device features to underlying device */
430		vlan_group_for_each_dev(grp, i, vlandev)
 
 
 
 
431			vlan_transfer_features(dev, vlandev);
 
 
432		break;
433
434	case NETDEV_DOWN: {
435		struct net_device *tmp;
436		LIST_HEAD(close_list);
 
 
 
437
438		/* Put all VLANs for this dev in the down state too.  */
439		vlan_group_for_each_dev(grp, i, vlandev) {
440			flgs = vlandev->flags;
441			if (!(flgs & IFF_UP))
442				continue;
443
444			vlan = vlan_dev_priv(vlandev);
445			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
446				list_add(&vlandev->close_list, &close_list);
 
447		}
 
448
449		dev_close_many(&close_list, false);
450
451		list_for_each_entry_safe(vlandev, tmp, &close_list, close_list) {
452			vlan_stacked_transfer_operstate(dev, vlandev,
453							vlan_dev_priv(vlandev));
454			list_del_init(&vlandev->close_list);
455		}
456		list_del(&close_list);
457		break;
458	}
459	case NETDEV_UP:
460		/* Put all VLANs for this dev in the up state too.  */
461		vlan_group_for_each_dev(grp, i, vlandev) {
462			flgs = dev_get_flags(vlandev);
 
 
 
 
463			if (flgs & IFF_UP)
464				continue;
465
466			vlan = vlan_dev_priv(vlandev);
467			if (!(vlan->flags & VLAN_FLAG_LOOSE_BINDING))
468				dev_change_flags(vlandev, flgs | IFF_UP,
469						 extack);
470			vlan_stacked_transfer_operstate(dev, vlandev, vlan);
471		}
472		break;
473
474	case NETDEV_UNREGISTER:
475		/* twiddle thumbs on netns device moves */
476		if (dev->reg_state != NETREG_UNREGISTERING)
477			break;
478
479		vlan_group_for_each_dev(grp, i, vlandev) {
480			/* removal of last vid destroys vlan_info, abort
 
 
 
 
481			 * afterwards */
482			if (vlan_info->nr_vids == 1)
483				last = true;
484
485			unregister_vlan_dev(vlandev, &list);
486			if (last)
487				break;
488		}
489		unregister_netdevice_many(&list);
490		break;
491
492	case NETDEV_PRE_TYPE_CHANGE:
493		/* Forbid underlaying device to change its type. */
494		if (vlan_uses_dev(dev))
495			return NOTIFY_BAD;
496		break;
497
498	case NETDEV_NOTIFY_PEERS:
499	case NETDEV_BONDING_FAILOVER:
500	case NETDEV_RESEND_IGMP:
501		/* Propagate to vlan devices */
502		vlan_group_for_each_dev(grp, i, vlandev)
 
 
 
 
503			call_netdevice_notifiers(event, vlandev);
504		break;
505
506	case NETDEV_CVLAN_FILTER_PUSH_INFO:
507		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021Q));
508		if (err)
509			return notifier_from_errno(err);
510		break;
511
512	case NETDEV_CVLAN_FILTER_DROP_INFO:
513		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021Q));
514		break;
515
516	case NETDEV_SVLAN_FILTER_PUSH_INFO:
517		err = vlan_filter_push_vids(vlan_info, htons(ETH_P_8021AD));
518		if (err)
519			return notifier_from_errno(err);
520		break;
521
522	case NETDEV_SVLAN_FILTER_DROP_INFO:
523		vlan_filter_drop_vids(vlan_info, htons(ETH_P_8021AD));
524		break;
525	}
526
527out:
528	return NOTIFY_DONE;
529}
530
531static struct notifier_block vlan_notifier_block __read_mostly = {
532	.notifier_call = vlan_device_event,
533};
534
535/*
536 *	VLAN IOCTL handler.
537 *	o execute requested action or pass command to the device driver
538 *   arg is really a struct vlan_ioctl_args __user *.
539 */
540static int vlan_ioctl_handler(struct net *net, void __user *arg)
541{
542	int err;
543	struct vlan_ioctl_args args;
544	struct net_device *dev = NULL;
545
546	if (copy_from_user(&args, arg, sizeof(struct vlan_ioctl_args)))
547		return -EFAULT;
548
549	/* Null terminate this sucker, just in case. */
550	args.device1[sizeof(args.device1) - 1] = 0;
551	args.u.device2[sizeof(args.u.device2) - 1] = 0;
552
553	rtnl_lock();
554
555	switch (args.cmd) {
556	case SET_VLAN_INGRESS_PRIORITY_CMD:
557	case SET_VLAN_EGRESS_PRIORITY_CMD:
558	case SET_VLAN_FLAG_CMD:
559	case ADD_VLAN_CMD:
560	case DEL_VLAN_CMD:
561	case GET_VLAN_REALDEV_NAME_CMD:
562	case GET_VLAN_VID_CMD:
563		err = -ENODEV;
564		dev = __dev_get_by_name(net, args.device1);
565		if (!dev)
566			goto out;
567
568		err = -EINVAL;
569		if (args.cmd != ADD_VLAN_CMD && !is_vlan_dev(dev))
570			goto out;
571	}
572
573	switch (args.cmd) {
574	case SET_VLAN_INGRESS_PRIORITY_CMD:
575		err = -EPERM;
576		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
577			break;
578		vlan_dev_set_ingress_priority(dev,
579					      args.u.skb_priority,
580					      args.vlan_qos);
581		err = 0;
582		break;
583
584	case SET_VLAN_EGRESS_PRIORITY_CMD:
585		err = -EPERM;
586		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
587			break;
588		err = vlan_dev_set_egress_priority(dev,
589						   args.u.skb_priority,
590						   args.vlan_qos);
591		break;
592
593	case SET_VLAN_FLAG_CMD:
594		err = -EPERM;
595		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
596			break;
597		err = vlan_dev_change_flags(dev,
598					    args.vlan_qos ? args.u.flag : 0,
599					    args.u.flag);
600		break;
601
602	case SET_VLAN_NAME_TYPE_CMD:
603		err = -EPERM;
604		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
605			break;
606		if (args.u.name_type < VLAN_NAME_TYPE_HIGHEST) {
 
607			struct vlan_net *vn;
608
609			vn = net_generic(net, vlan_net_id);
610			vn->name_type = args.u.name_type;
611			err = 0;
612		} else {
613			err = -EINVAL;
614		}
615		break;
616
617	case ADD_VLAN_CMD:
618		err = -EPERM;
619		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
620			break;
621		err = register_vlan_device(dev, args.u.VID);
622		break;
623
624	case DEL_VLAN_CMD:
625		err = -EPERM;
626		if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
627			break;
628		unregister_vlan_dev(dev, NULL);
629		err = 0;
630		break;
631
632	case GET_VLAN_REALDEV_NAME_CMD:
633		err = 0;
634		vlan_dev_get_realdev_name(dev, args.u.device2,
635					  sizeof(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	}
653out:
654	rtnl_unlock();
655	return err;
656}
657
658static 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
670static void __net_exit vlan_exit_net(struct net *net)
671{
672	vlan_proc_cleanup(net);
673}
674
675static 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
682static 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
711err5:
712	vlan_mvrp_uninit();
713err4:
714	vlan_gvrp_uninit();
715err3:
716	unregister_netdevice_notifier(&vlan_notifier_block);
717err2:
718	unregister_pernet_subsys(&vlan_net_ops);
719err0:
720	return err;
721}
722
723static 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
738module_init(vlan_proto_init);
739module_exit(vlan_cleanup_module);
740
741MODULE_DESCRIPTION("802.1Q/802.1ad VLAN Protocol");
742MODULE_LICENSE("GPL");
743MODULE_VERSION(DRV_VERSION);