// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Network event notifiers
*
* Authors :
* Tom Tucker < tom @ opengridcomputing . com >
* Steve Wise < swise @ opengridcomputing . com >
*
* 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);
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