Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 1 | /* |
| 2 | * xt_CONNMARK - Netfilter module to modify the connection mark values |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -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 | #include <linux/module.h> |
| 24 | #include <linux/skbuff.h> |
| 25 | #include <linux/ip.h> |
| 26 | #include <net/checksum.h> |
| 27 | |
Robert P. J. Day | 3a4fa0a | 2007-10-19 23:10:43 +0200 | [diff] [blame] | 28 | MODULE_AUTHOR("Henrik Nordstrom <hno@marasystems.com>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 29 | MODULE_DESCRIPTION("Xtables: connection mark modification"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | MODULE_LICENSE("GPL"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 31 | MODULE_ALIAS("ipt_CONNMARK"); |
Jan Engelhardt | 73aaf93 | 2007-10-11 14:36:40 -0700 | [diff] [blame] | 32 | MODULE_ALIAS("ip6t_CONNMARK"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 34 | #include <linux/netfilter/x_tables.h> |
| 35 | #include <linux/netfilter/xt_CONNMARK.h> |
Martin Josefsson | f618012 | 2006-11-29 02:35:01 +0100 | [diff] [blame] | 36 | #include <net/netfilter/nf_conntrack_ecache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
| 38 | static unsigned int |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 39 | connmark_tg(struct sk_buff *skb, const struct xt_target_param *par) |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 40 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 41 | const struct xt_connmark_tginfo1 *info = par->targinfo; |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 42 | enum ip_conntrack_info ctinfo; |
| 43 | struct nf_conn *ct; |
| 44 | u_int32_t newmark; |
| 45 | |
| 46 | ct = nf_ct_get(skb, &ctinfo); |
| 47 | if (ct == NULL) |
| 48 | return XT_CONTINUE; |
| 49 | |
| 50 | switch (info->mode) { |
| 51 | case XT_CONNMARK_SET: |
| 52 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; |
| 53 | if (ct->mark != newmark) { |
| 54 | ct->mark = newmark; |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 55 | nf_conntrack_event_cache(IPCT_MARK, ct); |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 56 | } |
| 57 | break; |
| 58 | case XT_CONNMARK_SAVE: |
| 59 | newmark = (ct->mark & ~info->ctmask) ^ |
| 60 | (skb->mark & info->nfmask); |
| 61 | if (ct->mark != newmark) { |
| 62 | ct->mark = newmark; |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 63 | nf_conntrack_event_cache(IPCT_MARK, ct); |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 64 | } |
| 65 | break; |
| 66 | case XT_CONNMARK_RESTORE: |
| 67 | newmark = (skb->mark & ~info->nfmask) ^ |
| 68 | (ct->mark & info->ctmask); |
| 69 | skb->mark = newmark; |
| 70 | break; |
| 71 | } |
| 72 | |
| 73 | return XT_CONTINUE; |
| 74 | } |
| 75 | |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 76 | static bool connmark_tg_check(const struct xt_tgchk_param *par) |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 77 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 78 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 79 | printk(KERN_WARNING "cannot load conntrack support for " |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 80 | "proto=%u\n", par->family); |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 81 | return false; |
| 82 | } |
| 83 | return true; |
| 84 | } |
| 85 | |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 86 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 87 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 88 | nf_ct_l3proto_module_put(par->family); |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 89 | } |
| 90 | |
Jan Engelhardt | e973a70 | 2009-06-12 18:42:12 +0200 | [diff] [blame] | 91 | static struct xt_target connmark_tg_reg __read_mostly = { |
| 92 | .name = "CONNMARK", |
| 93 | .revision = 1, |
| 94 | .family = NFPROTO_UNSPEC, |
| 95 | .checkentry = connmark_tg_check, |
| 96 | .target = connmark_tg, |
| 97 | .targetsize = sizeof(struct xt_connmark_tginfo1), |
| 98 | .destroy = connmark_tg_destroy, |
| 99 | .me = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | }; |
| 101 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 102 | static int __init connmark_tg_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
Jan Engelhardt | e973a70 | 2009-06-12 18:42:12 +0200 | [diff] [blame] | 104 | return xt_register_target(&connmark_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 107 | static void __exit connmark_tg_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | { |
Jan Engelhardt | e973a70 | 2009-06-12 18:42:12 +0200 | [diff] [blame] | 109 | xt_unregister_target(&connmark_tg_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | } |
| 111 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 112 | module_init(connmark_tg_init); |
| 113 | module_exit(connmark_tg_exit); |