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Linux/net/netfilter/xt_connmark.c

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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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