Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 1 | /* |
| 2 | * xt_connmark - Netfilter module to match connection mark values |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 26 | #include <net/netfilter/nf_conntrack.h> |
| 27 | #include <linux/netfilter/x_tables.h> |
| 28 | #include <linux/netfilter/xt_connmark.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 30 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 31 | MODULE_DESCRIPTION("Xtables: connection mark match"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | MODULE_LICENSE("GPL"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 33 | MODULE_ALIAS("ipt_connmark"); |
Jan Engelhardt | 73aaf93 | 2007-10-11 14:36:40 -0700 | [diff] [blame] | 34 | MODULE_ALIAS("ip6t_connmark"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 36 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 37 | connmark_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 39 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 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 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 50 | static bool connmark_mt_check(const struct xt_mtchk_param *par) |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 51 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 52 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 53 | printk(KERN_WARNING "cannot load conntrack support for " |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 54 | "proto=%u\n", par->family); |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 55 | return false; |
| 56 | } |
| 57 | return true; |
| 58 | } |
| 59 | |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 60 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 61 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 62 | nf_ct_l3proto_module_put(par->family); |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 63 | } |
| 64 | |
Jan Engelhardt | 84899a2 | 2009-06-12 18:50:33 +0200 | [diff] [blame] | 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, |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 74 | }; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 75 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 76 | static int __init connmark_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | { |
Jan Engelhardt | 84899a2 | 2009-06-12 18:50:33 +0200 | [diff] [blame] | 78 | return xt_register_match(&connmark_mt_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 81 | static void __exit connmark_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | { |
Jan Engelhardt | 84899a2 | 2009-06-12 18:50:33 +0200 | [diff] [blame] | 83 | xt_unregister_match(&connmark_mt_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } |
| 85 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 86 | module_init(connmark_mt_init); |
| 87 | module_exit(connmark_mt_exit); |