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
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* Implements a dummy match to allow attaching comments to rules
*
* 2003-05-13 Brad Fisher (brad@info-link.net)
*/
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_comment.h>
MODULE_AUTHOR("Brad Fisher <brad@info-link.net>");
MODULE_DESCRIPTION("iptables comment match module");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_comment");
MODULE_ALIAS("ip6t_comment");
static int
match(const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const void *matchinfo,
int offset,
unsigned int protooff,
int *hotdrop)
{
/* We always match */
return 1;
}
static int
checkentry(const char *tablename,
const void *ip,
void *matchinfo,
unsigned int matchsize,
unsigned int hook_mask)
{
/* Check the size */
if (matchsize != XT_ALIGN(sizeof(struct xt_comment_info)))
return 0;
return 1;
}
static struct xt_match comment_match = {
.name = "comment",
.match = match,
.checkentry = checkentry,
.me = THIS_MODULE
};
static struct xt_match comment6_match = {
.name = "comment",
.match = match,
.checkentry = checkentry,
.me = THIS_MODULE
};
static int __init init(void)
{
int ret;
ret = xt_register_match(AF_INET, &comment_match);
if (ret)
return ret;
ret = xt_register_match(AF_INET6, &comment6_match);
if (ret)
xt_unregister_match(AF_INET, &comment_match);
return ret;
}
static void __exit fini(void)
{
xt_unregister_match(AF_INET, &comment_match);
xt_unregister_match(AF_INET6, &comment6_match);
}
module_init(init);
module_exit(fini);
|
