mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-21 02:49:11 +00:00
089af26c70
There is nothing IPv4-specific in it. In fact, it was already used by IPv6, too... Upcoming nfnetlink_queue code will use it for any kind of packet. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
104 lines
2.6 KiB
C
104 lines
2.6 KiB
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_ipv4/ip_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
|
|
target(struct sk_buff **pskb,
|
|
const struct net_device *in,
|
|
const struct net_device *out,
|
|
unsigned int hooknum,
|
|
const void *targinfo,
|
|
void *userinfo)
|
|
{
|
|
const struct ipt_tos_target_info *tosinfo = targinfo;
|
|
|
|
if (((*pskb)->nh.iph->tos & IPTOS_TOS_MASK) != tosinfo->tos) {
|
|
u_int16_t diffs[2];
|
|
|
|
if (!skb_make_writable(pskb, sizeof(struct iphdr)))
|
|
return NF_DROP;
|
|
|
|
diffs[0] = htons((*pskb)->nh.iph->tos) ^ 0xFFFF;
|
|
(*pskb)->nh.iph->tos
|
|
= ((*pskb)->nh.iph->tos & IPTOS_PREC_MASK)
|
|
| tosinfo->tos;
|
|
diffs[1] = htons((*pskb)->nh.iph->tos);
|
|
(*pskb)->nh.iph->check
|
|
= csum_fold(csum_partial((char *)diffs,
|
|
sizeof(diffs),
|
|
(*pskb)->nh.iph->check
|
|
^0xFFFF));
|
|
}
|
|
return IPT_CONTINUE;
|
|
}
|
|
|
|
static int
|
|
checkentry(const char *tablename,
|
|
const struct ipt_entry *e,
|
|
void *targinfo,
|
|
unsigned int targinfosize,
|
|
unsigned int hook_mask)
|
|
{
|
|
const u_int8_t tos = ((struct ipt_tos_target_info *)targinfo)->tos;
|
|
|
|
if (targinfosize != IPT_ALIGN(sizeof(struct ipt_tos_target_info))) {
|
|
printk(KERN_WARNING "TOS: targinfosize %u != %Zu\n",
|
|
targinfosize,
|
|
IPT_ALIGN(sizeof(struct ipt_tos_target_info)));
|
|
return 0;
|
|
}
|
|
|
|
if (strcmp(tablename, "mangle") != 0) {
|
|
printk(KERN_WARNING "TOS: can only be called from \"mangle\" table, not \"%s\"\n", tablename);
|
|
return 0;
|
|
}
|
|
|
|
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 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static struct ipt_target ipt_tos_reg = {
|
|
.name = "TOS",
|
|
.target = target,
|
|
.checkentry = checkentry,
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init init(void)
|
|
{
|
|
return ipt_register_target(&ipt_tos_reg);
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
ipt_unregister_target(&ipt_tos_reg);
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|