[NETFILTER]: remove ipt_TOS.c

/* This is a module which is used for setting the TOS field of a packet. */

/* (C) 1999-2001 Paul `Rusty' Russell

 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>

 *

 * 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/x_tables.h>

#include <linux/netfilter_ipv4/ipt_TOS.h>

MODULE_LICENSE("GPL");

MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");

MODULE_DESCRIPTION("iptables TOS mangling module");

static unsigned int

tos_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 ipt_tos_target_info *tosinfo = targinfo;

	struct iphdr *iph = ip_hdr(skb);

	if ((iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {

		__u8 oldtos;

		if (!skb_make_writable(skb, sizeof(struct iphdr)))

			return NF_DROP;

		iph = ip_hdr(skb);

		oldtos = iph->tos;

		iph->tos = (iph->tos & IPTOS_PREC_MASK) | tosinfo->tos;

		csum_replace2(&iph->check, htons(oldtos), htons(iph->tos));

	}

	return XT_CONTINUE;

}

static bool

tos_tg_check(const char *tablename, const void *e_void,

             const struct xt_target *target, void *targinfo,

             unsigned int hook_mask)

{

	const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;

	if (tos != IPTOS_LOWDELAY

	    && tos != IPTOS_THROUGHPUT

	    && tos != IPTOS_RELIABILITY

	    && tos != IPTOS_MINCOST

	    && tos != IPTOS_NORMALSVC) {

		printk(KERN_WARNING "TOS: bad tos value %#x\n", tos);

		return false;

	}

	return true;

}

static struct xt_target tos_tg_reg __read_mostly = {

	.name		= "TOS",

	.family		= AF_INET,

	.target		= tos_tg,

	.targetsize	= sizeof(struct ipt_tos_target_info),

	.table		= "mangle",

	.checkentry	= tos_tg_check,

	.me		= THIS_MODULE,

};

static int __init tos_tg_init(void)

{

	return xt_register_target(&tos_tg_reg);

}

static void __exit tos_tg_exit(void)

{

	xt_unregister_target(&tos_tg_reg);

}

module_init(tos_tg_init);

module_exit(tos_tg_exit);