| | 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); |
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