1 /* Kernel module to match connection tracking information. */
3 /* (C) 1999-2001 Paul `Rusty' Russell
4 * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/module.h>
12 #include <linux/skbuff.h>
13 #include <net/netfilter/nf_conntrack.h>
14 #include <linux/netfilter/x_tables.h>
15 #include <linux/netfilter/xt_state.h>
17 MODULE_LICENSE("GPL");
18 MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
19 MODULE_DESCRIPTION("ip[6]_tables connection tracking state match module");
20 MODULE_ALIAS("ipt_state");
21 MODULE_ALIAS("ip6t_state");
24 state_mt(const struct sk_buff
*skb
, const struct xt_match_param
*par
)
26 const struct xt_state_info
*sinfo
= par
->matchinfo
;
27 enum ip_conntrack_info ctinfo
;
28 unsigned int statebit
;
30 if (nf_ct_is_untracked(skb
))
31 statebit
= XT_STATE_UNTRACKED
;
32 else if (!nf_ct_get(skb
, &ctinfo
))
33 statebit
= XT_STATE_INVALID
;
35 statebit
= XT_STATE_BIT(ctinfo
);
37 return (sinfo
->statemask
& statebit
);
40 static bool state_mt_check(const struct xt_mtchk_param
*par
)
42 if (nf_ct_l3proto_try_module_get(par
->match
->family
) < 0) {
43 printk(KERN_WARNING
"can't load conntrack support for "
44 "proto=%u\n", par
->match
->family
);
50 static void state_mt_destroy(const struct xt_mtdtor_param
*par
)
52 nf_ct_l3proto_module_put(par
->match
->family
);
55 static struct xt_match state_mt_reg
[] __read_mostly
= {
58 .family
= NFPROTO_IPV4
,
59 .checkentry
= state_mt_check
,
61 .destroy
= state_mt_destroy
,
62 .matchsize
= sizeof(struct xt_state_info
),
67 .family
= NFPROTO_IPV6
,
68 .checkentry
= state_mt_check
,
70 .destroy
= state_mt_destroy
,
71 .matchsize
= sizeof(struct xt_state_info
),
76 static int __init
state_mt_init(void)
78 return xt_register_matches(state_mt_reg
, ARRAY_SIZE(state_mt_reg
));
81 static void __exit
state_mt_exit(void)
83 xt_unregister_matches(state_mt_reg
, ARRAY_SIZE(state_mt_reg
));
86 module_init(state_mt_init
);
87 module_exit(state_mt_exit
);
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