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1 | /* |
2 | * xt_connmark - Netfilter module to match connection mark values |
3 | * |
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> |
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> |
26 | #include <net/netfilter/nf_conntrack.h> |
27 | #include <linux/netfilter/x_tables.h> |
28 | #include <linux/netfilter/xt_connmark.h> |
29 | |
30 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
31 | MODULE_DESCRIPTION("Xtables: connection mark match"); |
32 | MODULE_LICENSE("GPL"); |
33 | MODULE_ALIAS("ipt_connmark"); |
34 | MODULE_ALIAS("ip6t_connmark"); |
35 | |
36 | static bool |
37 | connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
38 | { |
39 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
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 | |
50 | static bool connmark_mt_check(const struct xt_mtchk_param *par) |
51 | { |
52 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
53 | printk(KERN_WARNING "cannot load conntrack support for " |
54 | "proto=%u\n", par->family); |
55 | return false; |
56 | } |
57 | return true; |
58 | } |
59 | |
60 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
61 | { |
62 | nf_ct_l3proto_module_put(par->family); |
63 | } |
64 | |
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, |
74 | }; |
75 | |
76 | static int __init connmark_mt_init(void) |
77 | { |
78 | return xt_register_match(&connmark_mt_reg); |
79 | } |
80 | |
81 | static void __exit connmark_mt_exit(void) |
82 | { |
83 | xt_unregister_match(&connmark_mt_reg); |
84 | } |
85 | |
86 | module_init(connmark_mt_init); |
87 | module_exit(connmark_mt_exit); |
88 |
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