net/core/skbuff_notifier.c

/*
 * Copyright (c) 2016, The Linux Foundation. All rights reserved.
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/* Notifier interface for the SKB Recycler */

#include "skbuff_notifier.h"

static BLOCKING_NOTIFIER_HEAD(skb_recycler_notifier);

int skb_recycler_notifier_register(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&skb_recycler_notifier, nb);
}
EXPORT_SYMBOL(skb_recycler_notifier_register);

int skb_recycler_notifier_unregister(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&skb_recycler_notifier, nb);
}
EXPORT_SYMBOL(skb_recycler_notifier_unregister);

int skb_recycler_notifier_send_event(unsigned long action, struct sk_buff *skb)
{
	int ret;

	ret = blocking_notifier_call_chain(&skb_recycler_notifier, action, skb);

	return 0;
}