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1 | /* Kernel module to match connection tracking information. */ |
2 | |
3 | /* (C) 1999-2001 Paul `Rusty' Russell |
4 | * (C) 2002-2005 Netfilter Core Team <coreteam@netfilter.org> |
5 | * |
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. |
9 | */ |
10 | |
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> |
16 | |
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"); |
22 | |
23 | static bool |
24 | state_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
25 | { |
26 | const struct xt_state_info *sinfo = par->matchinfo; |
27 | enum ip_conntrack_info ctinfo; |
28 | unsigned int statebit; |
29 | |
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; |
34 | else |
35 | statebit = XT_STATE_BIT(ctinfo); |
36 | |
37 | return (sinfo->statemask & statebit); |
38 | } |
39 | |
40 | static bool state_mt_check(const struct xt_mtchk_param *par) |
41 | { |
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); |
45 | return false; |
46 | } |
47 | return true; |
48 | } |
49 | |
50 | static void state_mt_destroy(const struct xt_mtdtor_param *par) |
51 | { |
52 | nf_ct_l3proto_module_put(par->match->family); |
53 | } |
54 | |
55 | static struct xt_match state_mt_reg[] __read_mostly = { |
56 | { |
57 | .name = "state", |
58 | .family = NFPROTO_IPV4, |
59 | .checkentry = state_mt_check, |
60 | .match = state_mt, |
61 | .destroy = state_mt_destroy, |
62 | .matchsize = sizeof(struct xt_state_info), |
63 | .me = THIS_MODULE, |
64 | }, |
65 | { |
66 | .name = "state", |
67 | .family = NFPROTO_IPV6, |
68 | .checkentry = state_mt_check, |
69 | .match = state_mt, |
70 | .destroy = state_mt_destroy, |
71 | .matchsize = sizeof(struct xt_state_info), |
72 | .me = THIS_MODULE, |
73 | }, |
74 | }; |
75 | |
76 | static int __init state_mt_init(void) |
77 | { |
78 | return xt_register_matches(state_mt_reg, ARRAY_SIZE(state_mt_reg)); |
79 | } |
80 | |
81 | static void __exit state_mt_exit(void) |
82 | { |
83 | xt_unregister_matches(state_mt_reg, ARRAY_SIZE(state_mt_reg)); |
84 | } |
85 | |
86 | module_init(state_mt_init); |
87 | module_exit(state_mt_exit); |
88 |
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