[linux.git] / net / core / netevent.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *	Network event notifiers
 *
 *	Authors:
 *      Tom Tucker             <[email protected]>
 *      Steve Wise             <[email protected]>
 *
 *	Fixes:
 */

#include <linux/rtnetlink.h>
#include <linux/notifier.h>
#include <linux/export.h>
#include <net/netevent.h>

static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);

/**
 *	register_netevent_notifier - register a netevent notifier block
 *	@nb: notifier
 *
 *	Register a notifier to be called when a netevent occurs.
 *	The notifier passed is linked into the kernel structures and must
 *	not be reused until it has been unregistered. A negative errno code
 *	is returned on a failure.
 */
int register_netevent_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_register(&netevent_notif_chain, nb);
}
EXPORT_SYMBOL_GPL(register_netevent_notifier);

/**
 *	unregister_netevent_notifier - unregister a netevent notifier block
 *	@nb: notifier
 *
 *	Unregister a notifier previously registered by
 *	register_neigh_notifier(). The notifier is unlinked into the
 *	kernel structures and may then be reused. A negative errno code
 *	is returned on a failure.
 */

int unregister_netevent_notifier(struct notifier_block *nb)
{
	return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
}
EXPORT_SYMBOL_GPL(unregister_netevent_notifier);

/**
 *	call_netevent_notifiers - call all netevent notifier blocks
 *      @val: value passed unmodified to notifier function
 *      @v:   pointer passed unmodified to notifier function
 *
 *	Call all neighbour notifier blocks.  Parameters and return value
 *	are as for notifier_call_chain().
 */

int call_netevent_notifiers(unsigned long val, void *v)
{
	return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
}
EXPORT_SYMBOL_GPL(call_netevent_notifiers);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
792d1932 TT	2	/*
	3	* Network event notifiers
	4	*
	5	* Authors:
	6	* Tom Tucker <[email protected]>
	7	* Steve Wise <[email protected]>
	8	*
792d1932 TT	9	* Fixes:
	10	*/
	11
	12	#include <linux/rtnetlink.h>
	13	#include <linux/notifier.h>
bc3b2d7f	14	#include <linux/export.h>
94b83419	15	#include <net/netevent.h>
792d1932 TT	16
	17	static ATOMIC_NOTIFIER_HEAD(netevent_notif_chain);
	18
	19	/**
	20	* register_netevent_notifier - register a netevent notifier block
	21	* @nb: notifier
	22	*
	23	* Register a notifier to be called when a netevent occurs.
	24	* The notifier passed is linked into the kernel structures and must
	25	* not be reused until it has been unregistered. A negative errno code
	26	* is returned on a failure.
	27	*/
	28	int register_netevent_notifier(struct notifier_block *nb)
	29	{
282c320d	30	return atomic_notifier_chain_register(&netevent_notif_chain, nb);
792d1932	31	}
9e34a5b5	32	EXPORT_SYMBOL_GPL(register_netevent_notifier);
792d1932 TT	33
792d1932 TT	34	/**
bb2882bc	35	* unregister_netevent_notifier - unregister a netevent notifier block
792d1932 TT	36	* @nb: notifier
	37	*
	38	* Unregister a notifier previously registered by
	39	* register_neigh_notifier(). The notifier is unlinked into the
	40	* kernel structures and may then be reused. A negative errno code
	41	* is returned on a failure.
	42	*/
	43
	44	int unregister_netevent_notifier(struct notifier_block *nb)
	45	{
	46	return atomic_notifier_chain_unregister(&netevent_notif_chain, nb);
	47	}
9e34a5b5	48	EXPORT_SYMBOL_GPL(unregister_netevent_notifier);
792d1932 TT	49
	50	/**
	51	* call_netevent_notifiers - call all netevent notifier blocks
	52	* @val: value passed unmodified to notifier function
	53	* @v: pointer passed unmodified to notifier function
	54	*
	55	* Call all neighbour notifier blocks. Parameters and return value
	56	* are as for notifier_call_chain().
	57	*/
	58
	59	int call_netevent_notifiers(unsigned long val, void *v)
	60	{
	61	return atomic_notifier_call_chain(&netevent_notif_chain, val, v);
	62	}
792d1932	63	EXPORT_SYMBOL_GPL(call_netevent_notifiers);