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
55
56
57
58
59
60
61
62
63
|
/*
BCOUNT target
Copyright (C) 2006 Jonathan Zarate
Licensed under GNU GPL v2 or later.
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ip_conntrack.h>
#include <linux/netfilter_ipv4/ipt_BCOUNT.h>
// #define DEBUG_BCOUNT
static unsigned int target(struct sk_buff **pskb, unsigned int hooknum,
const struct net_device *in, const struct net_device *out,
const void *targinfo, void *userinfo)
{
struct ip_conntrack *ct;
enum ip_conntrack_info ctinfo;
ct = ip_conntrack_get(*pskb, &ctinfo);
if (ct) {
ct->bcount += (*pskb)->len;
if (ct->bcount >= 0x0FFFFFFF) ct->bcount = 0x0FFFFFFF;
#ifdef DEBUG_BCOUNT
if (net_ratelimit())
printf(KERN_DEBUG "BCOUNT %lx %lx\n", (*pskb)->len, ct->bcount);
#endif
}
return IPT_CONTINUE;
}
static int checkentry(const char *tablename, const struct ipt_entry *e, void *targinfo,
unsigned int targinfosize, unsigned int hook_mask)
{
return (targinfosize == IPT_ALIGN(sizeof(struct ipt_BCOUNT_target)));
}
static struct ipt_target BCOUNT_target
= { { NULL, NULL }, "BCOUNT", target, checkentry, NULL, THIS_MODULE };
static int __init init(void)
{
return ipt_register_target(&BCOUNT_target);
}
static void __exit fini(void)
{
ipt_unregister_target(&BCOUNT_target);
}
module_init(init);
module_exit(fini);
MODULE_AUTHOR("Jonathan Zarate");
MODULE_DESCRIPTION("BCOUNT target");
MODULE_LICENSE("GPL");
|
