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
|
/*
* ebt_redirect
*
* Authors:
* Bart De Schuymer <bart.de.schuymer@pandora.be>
*
* April, 2002
*
*/
#include <linux/netfilter_bridge/ebtables.h>
#include <linux/netfilter_bridge/ebt_redirect.h>
#include <linux/netfilter_bridge.h>
#include <linux/skbuff.h>
#include <linux/module.h>
#include <net/sock.h>
#include "../br_private.h"
static int ebt_target_redirect(struct sk_buff **pskb, unsigned int hooknr,
const struct net_device *in, const struct net_device *out,
const void *data, unsigned int datalen)
{
struct ebt_redirect_info *infostuff = (struct ebt_redirect_info *) data;
if (hooknr != NF_BR_BROUTING)
memcpy((**pskb).mac.ethernet->h_dest,
in->br_port->br->dev.dev_addr, ETH_ALEN);
else {
memcpy((**pskb).mac.ethernet->h_dest,
in->dev_addr, ETH_ALEN);
(*pskb)->pkt_type = PACKET_HOST;
}
return infostuff->target;
}
static int ebt_target_redirect_check(const char *tablename, unsigned int hookmask,
const struct ebt_entry *e, void *data, unsigned int datalen)
{
struct ebt_redirect_info *infostuff = (struct ebt_redirect_info *) data;
if ( (strcmp(tablename, "nat") || hookmask & ~(1 << NF_BR_PRE_ROUTING)) &&
(strcmp(tablename, "broute") || hookmask & ~(1 << NF_BR_BROUTING)) )
return -EINVAL;
if (datalen != sizeof(struct ebt_redirect_info))
return -EINVAL;
if (infostuff->target < -NUM_STANDARD_TARGETS || infostuff->target >= 0)
return -EINVAL;
return 0;
}
static struct ebt_target redirect_target =
{
{NULL, NULL}, EBT_REDIRECT_TARGET, ebt_target_redirect,
ebt_target_redirect_check, NULL, THIS_MODULE
};
static int __init init(void)
{
return ebt_register_target(&redirect_target);
}
static void __exit fini(void)
{
ebt_unregister_target(&redirect_target);
}
module_init(init);
module_exit(fini);
EXPORT_NO_SYMBOLS;
MODULE_LICENSE("GPL");
|