fe0b9294c9
To do that, this makes nf_ct_l3proto_try_module_{get,put} compatible functions. As a result we can remove '#ifdef' surrounds and direct call of need_conntrack(). Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp> Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
/* Kernel module to match connection tracking information. */
|
|
|
|
/* (C) 1999-2001 Paul `Rusty' Russell
|
|
* (C) 2002-2005 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 <net/netfilter/nf_conntrack_compat.h>
|
|
#include <linux/netfilter/x_tables.h>
|
|
#include <linux/netfilter/xt_state.h>
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
|
|
MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module");
|
|
MODULE_ALIAS("ipt_state");
|
|
MODULE_ALIAS("ip6t_state");
|
|
|
|
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 xt_state_info *sinfo = matchinfo;
|
|
enum ip_conntrack_info ctinfo;
|
|
unsigned int statebit;
|
|
|
|
if (nf_ct_is_untracked(skb))
|
|
statebit = XT_STATE_UNTRACKED;
|
|
else if (!nf_ct_get_ctinfo(skb, &ctinfo))
|
|
statebit = XT_STATE_INVALID;
|
|
else
|
|
statebit = XT_STATE_BIT(ctinfo);
|
|
|
|
return (sinfo->statemask & statebit);
|
|
}
|
|
|
|
static int check(const char *tablename,
|
|
const void *inf,
|
|
const struct xt_match *match,
|
|
void *matchinfo,
|
|
unsigned int hook_mask)
|
|
{
|
|
if (nf_ct_l3proto_try_module_get(match->family) < 0) {
|
|
printk(KERN_WARNING "can't load conntrack support for "
|
|
"proto=%d\n", match->family);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
destroy(const struct xt_match *match, void *matchinfo)
|
|
{
|
|
nf_ct_l3proto_module_put(match->family);
|
|
}
|
|
|
|
static struct xt_match xt_state_match[] = {
|
|
{
|
|
.name = "state",
|
|
.family = AF_INET,
|
|
.checkentry = check,
|
|
.match = match,
|
|
.destroy = destroy,
|
|
.matchsize = sizeof(struct xt_state_info),
|
|
.me = THIS_MODULE,
|
|
},
|
|
{
|
|
.name = "state",
|
|
.family = AF_INET6,
|
|
.checkentry = check,
|
|
.match = match,
|
|
.destroy = destroy,
|
|
.matchsize = sizeof(struct xt_state_info),
|
|
.me = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init xt_state_init(void)
|
|
{
|
|
return xt_register_matches(xt_state_match, ARRAY_SIZE(xt_state_match));
|
|
}
|
|
|
|
static void __exit xt_state_fini(void)
|
|
{
|
|
xt_unregister_matches(xt_state_match, ARRAY_SIZE(xt_state_match));
|
|
}
|
|
|
|
module_init(xt_state_init);
|
|
module_exit(xt_state_fini);
|