blob: 47177591aeb6582e276600a792fdab158bf88722 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
|
/* IP tables module for matching the value of the IPv4 DSCP field
*
* ipt_dscp.c,v 1.3 2002/08/05 19:00:21 laforge Exp
*
* (C) 2002 by Harald Welte <laforge@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/netfilter_ipv4/ipt_dscp.h>
#include <linux/netfilter_ipv4/ip_tables.h>
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_DESCRIPTION("iptables DSCP matching module");
MODULE_LICENSE("GPL");
static int match(const struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
const struct xt_match *match, const void *matchinfo,
int offset, unsigned int protoff, int *hotdrop)
{
const struct ipt_dscp_info *info = matchinfo;
const struct iphdr *iph = skb->nh.iph;
u_int8_t sh_dscp = ((info->dscp << IPT_DSCP_SHIFT) & IPT_DSCP_MASK);
return ((iph->tos&IPT_DSCP_MASK) == sh_dscp) ^ info->invert;
}
static struct ipt_match dscp_match = {
.name = "dscp",
.match = match,
.matchsize = sizeof(struct ipt_dscp_info),
.me = THIS_MODULE,
};
static int __init ipt_dscp_init(void)
{
return ipt_register_match(&dscp_match);
}
static void __exit ipt_dscp_fini(void)
{
ipt_unregister_match(&dscp_match);
}
module_init(ipt_dscp_init);
module_exit(ipt_dscp_fini);
|
