Commit | Line | Data |
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96e32272 JE |
1 | /* |
2 | * xt_connmark - Netfilter module to match connection mark values | |
1da177e4 | 3 | * |
96e32272 JE |
4 | * Copyright (C) 2002,2004 MARA Systems AB <http://www.marasystems.com> |
5 | * by Henrik Nordstrom <hno@marasystems.com> | |
6 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 | |
7 | * Jan Engelhardt <jengelh@computergmbh.de> | |
1da177e4 LT |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
13 | * | |
14 | * This program is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | * GNU General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program; if not, write to the Free Software | |
21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/skbuff.h> | |
587aa641 PM |
26 | #include <net/netfilter/nf_conntrack.h> |
27 | #include <linux/netfilter/x_tables.h> | |
28 | #include <linux/netfilter/xt_connmark.h> | |
1da177e4 | 29 | |
3a4fa0a2 | 30 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
2ae15b64 | 31 | MODULE_DESCRIPTION("Xtables: connection mark match"); |
1da177e4 | 32 | MODULE_LICENSE("GPL"); |
2e4e6a17 | 33 | MODULE_ALIAS("ipt_connmark"); |
73aaf935 | 34 | MODULE_ALIAS("ip6t_connmark"); |
1da177e4 | 35 | |
1d93a9cb | 36 | static bool |
f7108a20 | 37 | connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
96e32272 | 38 | { |
f7108a20 | 39 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
96e32272 JE |
40 | enum ip_conntrack_info ctinfo; |
41 | const struct nf_conn *ct; | |
42 | ||
43 | ct = nf_ct_get(skb, &ctinfo); | |
44 | if (ct == NULL) | |
45 | return false; | |
46 | ||
47 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; | |
48 | } | |
49 | ||
9b4fce7a | 50 | static bool connmark_mt_check(const struct xt_mtchk_param *par) |
96e32272 | 51 | { |
92f3b2b1 | 52 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
96e32272 | 53 | printk(KERN_WARNING "cannot load conntrack support for " |
92f3b2b1 | 54 | "proto=%u\n", par->family); |
96e32272 JE |
55 | return false; |
56 | } | |
57 | return true; | |
58 | } | |
59 | ||
6be3d859 | 60 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
b9f78f9f | 61 | { |
92f3b2b1 | 62 | nf_ct_l3proto_module_put(par->family); |
b9f78f9f PNA |
63 | } |
64 | ||
84899a2b JE |
65 | static struct xt_match connmark_mt_reg __read_mostly = { |
66 | .name = "connmark", | |
67 | .revision = 1, | |
68 | .family = NFPROTO_UNSPEC, | |
69 | .checkentry = connmark_mt_check, | |
70 | .match = connmark_mt, | |
71 | .matchsize = sizeof(struct xt_connmark_mtinfo1), | |
72 | .destroy = connmark_mt_destroy, | |
73 | .me = THIS_MODULE, | |
1da177e4 LT |
74 | }; |
75 | ||
d3c5ee6d | 76 | static int __init connmark_mt_init(void) |
1da177e4 | 77 | { |
84899a2b | 78 | return xt_register_match(&connmark_mt_reg); |
1da177e4 LT |
79 | } |
80 | ||
d3c5ee6d | 81 | static void __exit connmark_mt_exit(void) |
1da177e4 | 82 | { |
84899a2b | 83 | xt_unregister_match(&connmark_mt_reg); |
1da177e4 LT |
84 | } |
85 | ||
d3c5ee6d JE |
86 | module_init(connmark_mt_init); |
87 | module_exit(connmark_mt_exit); |