USB: Add USB-ID for Multiplex RC serial adapter to cp210x.c
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / netfilter / xt_connmark.c
blob122aa8b0147b7360a65a90648603b45fd555d84e
1 /*
2 * xt_connmark - Netfilter module to match connection mark values
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>
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.
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.
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
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>
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");
36 static bool
37 connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par)
39 const struct xt_connmark_mtinfo1 *info = par->matchinfo;
40 enum ip_conntrack_info ctinfo;
41 const struct nf_conn *ct;
43 ct = nf_ct_get(skb, &ctinfo);
44 if (ct == NULL)
45 return false;
47 return ((ct->mark & info->mask) == info->mark) ^ info->invert;
50 static bool connmark_mt_check(const struct xt_mtchk_param *par)
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;
57 return true;
60 static void connmark_mt_destroy(const struct xt_mtdtor_param *par)
62 nf_ct_l3proto_module_put(par->family);
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,
76 static int __init connmark_mt_init(void)
78 return xt_register_match(&connmark_mt_reg);
81 static void __exit connmark_mt_exit(void)
83 xt_unregister_match(&connmark_mt_reg);
86 module_init(connmark_mt_init);
87 module_exit(connmark_mt_exit);