// 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);