Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 1 | /* |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 2 | * xt_connmark - Netfilter module to operate on connection marks |
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 |
Jan Engelhardt | 408ffaa | 2010-02-28 23:19:52 +0100 | [diff] [blame] | 7 | * Jan Engelhardt <jengelh@medozas.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> |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 27 | #include <net/netfilter/nf_conntrack_ecache.h> |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 28 | #include <linux/netfilter/x_tables.h> |
| 29 | #include <linux/netfilter/xt_connmark.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 31 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 32 | MODULE_DESCRIPTION("Xtables: connection mark operations"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | MODULE_LICENSE("GPL"); |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 34 | MODULE_ALIAS("ipt_CONNMARK"); |
| 35 | MODULE_ALIAS("ip6t_CONNMARK"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 36 | MODULE_ALIAS("ipt_connmark"); |
Jan Engelhardt | 73aaf93 | 2007-10-11 14:36:40 -0700 | [diff] [blame] | 37 | MODULE_ALIAS("ip6t_connmark"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 39 | static unsigned int |
| 40 | connmark_tg(struct sk_buff *skb, const struct xt_target_param *par) |
| 41 | { |
| 42 | const struct xt_connmark_tginfo1 *info = par->targinfo; |
| 43 | enum ip_conntrack_info ctinfo; |
| 44 | struct nf_conn *ct; |
| 45 | u_int32_t newmark; |
| 46 | |
| 47 | ct = nf_ct_get(skb, &ctinfo); |
| 48 | if (ct == NULL) |
| 49 | return XT_CONTINUE; |
| 50 | |
| 51 | switch (info->mode) { |
| 52 | case XT_CONNMARK_SET: |
| 53 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; |
| 54 | if (ct->mark != newmark) { |
| 55 | ct->mark = newmark; |
| 56 | nf_conntrack_event_cache(IPCT_MARK, ct); |
| 57 | } |
| 58 | break; |
| 59 | case XT_CONNMARK_SAVE: |
| 60 | newmark = (ct->mark & ~info->ctmask) ^ |
| 61 | (skb->mark & info->nfmask); |
| 62 | if (ct->mark != newmark) { |
| 63 | ct->mark = newmark; |
| 64 | nf_conntrack_event_cache(IPCT_MARK, ct); |
| 65 | } |
| 66 | break; |
| 67 | case XT_CONNMARK_RESTORE: |
| 68 | newmark = (skb->mark & ~info->nfmask) ^ |
| 69 | (ct->mark & info->ctmask); |
| 70 | skb->mark = newmark; |
| 71 | break; |
| 72 | } |
| 73 | |
| 74 | return XT_CONTINUE; |
| 75 | } |
| 76 | |
| 77 | static bool connmark_tg_check(const struct xt_tgchk_param *par) |
| 78 | { |
| 79 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame^] | 80 | pr_info("cannot load conntrack support for proto=%u\n", |
| 81 | par->family); |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 82 | return false; |
| 83 | } |
| 84 | return true; |
| 85 | } |
| 86 | |
| 87 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) |
| 88 | { |
| 89 | nf_ct_l3proto_module_put(par->family); |
| 90 | } |
| 91 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 92 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 93 | 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] | 94 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 95 | const struct xt_connmark_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 96 | enum ip_conntrack_info ctinfo; |
| 97 | const struct nf_conn *ct; |
| 98 | |
| 99 | ct = nf_ct_get(skb, &ctinfo); |
| 100 | if (ct == NULL) |
| 101 | return false; |
| 102 | |
| 103 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; |
| 104 | } |
| 105 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 106 | static bool connmark_mt_check(const struct xt_mtchk_param *par) |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 107 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 108 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Jan Engelhardt | 8bee4ba | 2010-03-17 16:04:40 +0100 | [diff] [blame^] | 109 | pr_info("cannot load conntrack support for proto=%u\n", |
| 110 | par->family); |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame] | 111 | return false; |
| 112 | } |
| 113 | return true; |
| 114 | } |
| 115 | |
Jan Engelhardt | 6be3d85 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 116 | static void connmark_mt_destroy(const struct xt_mtdtor_param *par) |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 117 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 118 | nf_ct_l3proto_module_put(par->family); |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 119 | } |
| 120 | |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 121 | static struct xt_target connmark_tg_reg __read_mostly = { |
| 122 | .name = "CONNMARK", |
| 123 | .revision = 1, |
| 124 | .family = NFPROTO_UNSPEC, |
| 125 | .checkentry = connmark_tg_check, |
| 126 | .target = connmark_tg, |
| 127 | .targetsize = sizeof(struct xt_connmark_tginfo1), |
| 128 | .destroy = connmark_tg_destroy, |
| 129 | .me = THIS_MODULE, |
| 130 | }; |
| 131 | |
Jan Engelhardt | 84899a2 | 2009-06-12 18:50:33 +0200 | [diff] [blame] | 132 | static struct xt_match connmark_mt_reg __read_mostly = { |
| 133 | .name = "connmark", |
| 134 | .revision = 1, |
| 135 | .family = NFPROTO_UNSPEC, |
| 136 | .checkentry = connmark_mt_check, |
| 137 | .match = connmark_mt, |
| 138 | .matchsize = sizeof(struct xt_connmark_mtinfo1), |
| 139 | .destroy = connmark_mt_destroy, |
| 140 | .me = THIS_MODULE, |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 141 | }; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 142 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 143 | static int __init connmark_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | { |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 145 | int ret; |
| 146 | |
| 147 | ret = xt_register_target(&connmark_tg_reg); |
| 148 | if (ret < 0) |
| 149 | return ret; |
| 150 | ret = xt_register_match(&connmark_mt_reg); |
| 151 | if (ret < 0) { |
| 152 | xt_unregister_target(&connmark_tg_reg); |
| 153 | return ret; |
| 154 | } |
| 155 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | } |
| 157 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 158 | static void __exit connmark_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | { |
Jan Engelhardt | 84899a2 | 2009-06-12 18:50:33 +0200 | [diff] [blame] | 160 | xt_unregister_match(&connmark_mt_reg); |
Jan Engelhardt | b8f00ba | 2010-02-26 14:20:32 +0100 | [diff] [blame] | 161 | xt_unregister_target(&connmark_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | } |
| 163 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 164 | module_init(connmark_mt_init); |
| 165 | module_exit(connmark_mt_exit); |