net/netfilter/xt_CLASSIFY.c

/*
 * This is a module which is used for setting the skb->priority field
 * of an skb for qdisc classification.
 */

/* (C) 2001-2002 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/ip.h>
#include <net/checksum.h>

#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_CLASSIFY.h>

MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Xtables: Qdisc classification");
MODULE_ALIAS("ipt_CLASSIFY");
MODULE_ALIAS("ip6t_CLASSIFY");

static unsigned int
classify_tg(struct sk_buff *skb, const struct net_device *in,
            const struct net_device *out, unsigned int hooknum,
            const struct xt_target *target, const void *targinfo)
{
	const struct xt_classify_target_info *clinfo = targinfo;

	skb->priority = clinfo->priority;
	return XT_CONTINUE;
}

static struct xt_target classify_tg_reg __read_mostly = {
	.name       = "CLASSIFY",
	.revision   = 0,
	.family     = NFPROTO_UNSPEC,
	.table      = "mangle",
	.hooks      = (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_FORWARD) |
		      (1 << NF_INET_POST_ROUTING),
	.target     = classify_tg,
	.targetsize = sizeof(struct xt_classify_target_info),
	.me         = THIS_MODULE,
};

static int __init classify_tg_init(void)
{
	return xt_register_target(&classify_tg_reg);
}

static void __exit classify_tg_exit(void)
{
	xt_unregister_target(&classify_tg_reg);
}

module_init(classify_tg_init);
module_exit(classify_tg_exit);