xt_classify.c

linux 内核源代码

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

/* (C) 2001-2002 Patrick McHardy <[e-mail]>
 *
 * 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 <[e-mail]>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("iptables qdisc classification target module");
MODULE_ALIAS("ipt_CLASSIFY");
MODULE_ALIAS("ip6t_CLASSIFY");

static unsigned int
target(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 xt_classify_target[] __read_mostly = {
	{
		.family		= AF_INET,
		.name 		= "CLASSIFY",
		.target 	= target,
		.targetsize	= sizeof(struct xt_classify_target_info),
		.table		= "mangle",
		.hooks		= (1 << NF_IP_LOCAL_OUT) |
				  (1 << NF_IP_FORWARD) |
				  (1 << NF_IP_POST_ROUTING),
		.me 		= THIS_MODULE,
	},
	{
		.name 		= "CLASSIFY",
		.family		= AF_INET6,
		.target 	= target,
		.targetsize	= sizeof(struct xt_classify_target_info),
		.table		= "mangle",
		.hooks		= (1 << NF_IP6_LOCAL_OUT) |
				  (1 << NF_IP6_FORWARD) |
				  (1 << NF_IP6_POST_ROUTING),
		.me 		= THIS_MODULE,
	},
};

static int __init xt_classify_init(void)
{
	return xt_register_targets(xt_classify_target,
				   ARRAY_SIZE(xt_classify_target));
}

static void __exit xt_classify_fini(void)
{
	xt_unregister_targets(xt_classify_target,
			      ARRAY_SIZE(xt_classify_target));
}

module_init(xt_classify_init);
module_exit(xt_classify_fini);