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>"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | MODULE_DESCRIPTION("IP tables connmark match module"); |
| 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 | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 37 | connmark_mt(const struct sk_buff *skb, const struct net_device *in, |
| 38 | const struct net_device *out, const struct xt_match *match, |
| 39 | const void *matchinfo, int offset, unsigned int protoff, |
| 40 | bool *hotdrop) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 42 | const struct xt_connmark_mtinfo1 *info = matchinfo; |
| 43 | enum ip_conntrack_info ctinfo; |
| 44 | const struct nf_conn *ct; |
| 45 | |
| 46 | ct = nf_ct_get(skb, &ctinfo); |
| 47 | if (ct == NULL) |
| 48 | return false; |
| 49 | |
| 50 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; |
| 51 | } |
| 52 | |
| 53 | static bool |
| 54 | connmark_mt_v0(const struct sk_buff *skb, const struct net_device *in, |
| 55 | const struct net_device *out, const struct xt_match *match, |
| 56 | const void *matchinfo, int offset, unsigned int protoff, |
| 57 | bool *hotdrop) |
| 58 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 59 | const struct xt_connmark_info *info = matchinfo; |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 60 | const struct nf_conn *ct; |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 61 | enum ip_conntrack_info ctinfo; |
| 62 | |
| 63 | ct = nf_ct_get(skb, &ctinfo); |
| 64 | if (!ct) |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 65 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Jan Engelhardt | 7c4e36b | 2007-07-07 22:19:08 -0700 | [diff] [blame] | 67 | return ((ct->mark & info->mask) == info->mark) ^ info->invert; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | } |
| 69 | |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 70 | static bool |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 71 | connmark_mt_check_v0(const char *tablename, const void *ip, |
| 72 | const struct xt_match *match, void *matchinfo, |
| 73 | unsigned int hook_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 75 | const struct xt_connmark_info *cm = matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 77 | if (cm->mark > 0xffffffff || cm->mask > 0xffffffff) { |
| 78 | printk(KERN_WARNING "connmark: only support 32bit mark\n"); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 79 | return false; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 80 | } |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 81 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { |
Yasuyuki Kozakai | fe0b929 | 2006-12-12 00:28:40 -0800 | [diff] [blame] | 82 | printk(KERN_WARNING "can't load conntrack support for " |
Jan Engelhardt | df54aae | 2007-12-17 22:43:15 -0800 | [diff] [blame] | 83 | "proto=%u\n", match->family); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 84 | return false; |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 85 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 86 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 89 | static bool |
| 90 | connmark_mt_check(const char *tablename, const void *ip, |
| 91 | const struct xt_match *match, void *matchinfo, |
| 92 | unsigned int hook_mask) |
| 93 | { |
| 94 | if (nf_ct_l3proto_try_module_get(match->family) < 0) { |
| 95 | printk(KERN_WARNING "cannot load conntrack support for " |
| 96 | "proto=%u\n", match->family); |
| 97 | return false; |
| 98 | } |
| 99 | return true; |
| 100 | } |
| 101 | |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 102 | static void |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 103 | connmark_mt_destroy(const struct xt_match *match, void *matchinfo) |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 104 | { |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 105 | nf_ct_l3proto_module_put(match->family); |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 106 | } |
| 107 | |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 108 | #ifdef CONFIG_COMPAT |
| 109 | struct compat_xt_connmark_info { |
| 110 | compat_ulong_t mark, mask; |
| 111 | u_int8_t invert; |
| 112 | u_int8_t __pad1; |
| 113 | u_int16_t __pad2; |
| 114 | }; |
| 115 | |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 116 | static void connmark_mt_compat_from_user_v0(void *dst, void *src) |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 117 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 118 | const struct compat_xt_connmark_info *cm = src; |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 119 | struct xt_connmark_info m = { |
| 120 | .mark = cm->mark, |
| 121 | .mask = cm->mask, |
| 122 | .invert = cm->invert, |
| 123 | }; |
| 124 | memcpy(dst, &m, sizeof(m)); |
| 125 | } |
| 126 | |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 127 | static int connmark_mt_compat_to_user_v0(void __user *dst, void *src) |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 128 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 129 | const struct xt_connmark_info *m = src; |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 130 | struct compat_xt_connmark_info cm = { |
| 131 | .mark = m->mark, |
| 132 | .mask = m->mask, |
| 133 | .invert = m->invert, |
| 134 | }; |
| 135 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 136 | } |
| 137 | #endif /* CONFIG_COMPAT */ |
| 138 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 139 | static struct xt_match connmark_mt_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 140 | { |
| 141 | .name = "connmark", |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 142 | .revision = 0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 143 | .family = AF_INET, |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 144 | .checkentry = connmark_mt_check_v0, |
| 145 | .match = connmark_mt_v0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 146 | .destroy = connmark_mt_destroy, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 147 | .matchsize = sizeof(struct xt_connmark_info), |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 148 | #ifdef CONFIG_COMPAT |
| 149 | .compatsize = sizeof(struct compat_xt_connmark_info), |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 150 | .compat_from_user = connmark_mt_compat_from_user_v0, |
| 151 | .compat_to_user = connmark_mt_compat_to_user_v0, |
Patrick McHardy | f1eda05 | 2006-09-20 12:06:25 -0700 | [diff] [blame] | 152 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 153 | .me = THIS_MODULE |
| 154 | }, |
| 155 | { |
| 156 | .name = "connmark", |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 157 | .revision = 0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 158 | .family = AF_INET6, |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 159 | .checkentry = connmark_mt_check_v0, |
| 160 | .match = connmark_mt_v0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 161 | .destroy = connmark_mt_destroy, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 162 | .matchsize = sizeof(struct xt_connmark_info), |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 163 | #ifdef CONFIG_COMPAT |
| 164 | .compatsize = sizeof(struct compat_xt_connmark_info), |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 165 | .compat_from_user = connmark_mt_compat_from_user_v0, |
| 166 | .compat_to_user = connmark_mt_compat_to_user_v0, |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 167 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 168 | .me = THIS_MODULE |
| 169 | }, |
Jan Engelhardt | 96e3227 | 2008-01-14 23:39:13 -0800 | [diff] [blame^] | 170 | { |
| 171 | .name = "connmark", |
| 172 | .revision = 1, |
| 173 | .family = AF_INET, |
| 174 | .checkentry = connmark_mt_check, |
| 175 | .match = connmark_mt, |
| 176 | .matchsize = sizeof(struct xt_connmark_mtinfo1), |
| 177 | .destroy = connmark_mt_destroy, |
| 178 | .me = THIS_MODULE, |
| 179 | }, |
| 180 | { |
| 181 | .name = "connmark", |
| 182 | .revision = 1, |
| 183 | .family = AF_INET6, |
| 184 | .checkentry = connmark_mt_check, |
| 185 | .match = connmark_mt, |
| 186 | .matchsize = sizeof(struct xt_connmark_mtinfo1), |
| 187 | .destroy = connmark_mt_destroy, |
| 188 | .me = THIS_MODULE, |
| 189 | }, |
Patrick McHardy | 5d04bff | 2006-03-20 18:01:58 -0800 | [diff] [blame] | 190 | }; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 191 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 192 | static int __init connmark_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 194 | return xt_register_matches(connmark_mt_reg, |
| 195 | ARRAY_SIZE(connmark_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | } |
| 197 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 198 | static void __exit connmark_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 200 | xt_unregister_matches(connmark_mt_reg, ARRAY_SIZE(connmark_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | } |
| 202 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 203 | module_init(connmark_mt_init); |
| 204 | module_exit(connmark_mt_exit); |