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_v0(struct sk_buff *skb, const struct xt_target_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 41 | const struct xt_connmark_target_info *markinfo = par->targinfo; |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 42 | struct nf_conn *ct; |
| 43 | enum ip_conntrack_info ctinfo; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 44 | u_int32_t diff; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 45 | u_int32_t mark; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 46 | u_int32_t newmark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Herbert Xu | 3db05fea | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 48 | ct = nf_ct_get(skb, &ctinfo); |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 49 | if (ct) { |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 50 | switch(markinfo->mode) { |
| 51 | case XT_CONNMARK_SET: |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 52 | newmark = (ct->mark & ~markinfo->mask) | markinfo->mark; |
| 53 | if (newmark != ct->mark) { |
| 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 | 2822b0d | 2007-02-07 15:06:43 -0800 | [diff] [blame] | 56 | } |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 57 | break; |
| 58 | case XT_CONNMARK_SAVE: |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 59 | newmark = (ct->mark & ~markinfo->mask) | |
Herbert Xu | 3db05fea | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 60 | (skb->mark & markinfo->mask); |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 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); |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 64 | } |
| 65 | break; |
| 66 | case XT_CONNMARK_RESTORE: |
Herbert Xu | 3db05fea | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 67 | mark = skb->mark; |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 68 | diff = (ct->mark ^ mark) & markinfo->mask; |
Herbert Xu | 3db05fea | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 69 | skb->mark = mark ^ diff; |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 70 | break; |
Pablo Neira Ayuso | 2521c12 | 2006-08-22 00:31:24 -0700 | [diff] [blame] | 71 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | } |
| 73 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 74 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | } |
| 76 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 77 | static unsigned int |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 78 | connmark_tg(struct sk_buff *skb, const struct xt_target_param *par) |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 79 | { |
Jan Engelhardt | 7eb3558 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 80 | const struct xt_connmark_tginfo1 *info = par->targinfo; |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 81 | enum ip_conntrack_info ctinfo; |
| 82 | struct nf_conn *ct; |
| 83 | u_int32_t newmark; |
| 84 | |
| 85 | ct = nf_ct_get(skb, &ctinfo); |
| 86 | if (ct == NULL) |
| 87 | return XT_CONTINUE; |
| 88 | |
| 89 | switch (info->mode) { |
| 90 | case XT_CONNMARK_SET: |
| 91 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; |
| 92 | if (ct->mark != newmark) { |
| 93 | ct->mark = newmark; |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 94 | nf_conntrack_event_cache(IPCT_MARK, ct); |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 95 | } |
| 96 | break; |
| 97 | case XT_CONNMARK_SAVE: |
| 98 | newmark = (ct->mark & ~info->ctmask) ^ |
| 99 | (skb->mark & info->nfmask); |
| 100 | if (ct->mark != newmark) { |
| 101 | ct->mark = newmark; |
Alexey Dobriyan | a71996f | 2008-10-08 11:35:07 +0200 | [diff] [blame] | 102 | nf_conntrack_event_cache(IPCT_MARK, ct); |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 103 | } |
| 104 | break; |
| 105 | case XT_CONNMARK_RESTORE: |
| 106 | newmark = (skb->mark & ~info->nfmask) ^ |
| 107 | (ct->mark & info->ctmask); |
| 108 | skb->mark = newmark; |
| 109 | break; |
| 110 | } |
| 111 | |
| 112 | return XT_CONTINUE; |
| 113 | } |
| 114 | |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 115 | static bool connmark_tg_check_v0(const struct xt_tgchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 117 | const struct xt_connmark_target_info *matchinfo = par->targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 119 | if (matchinfo->mode == XT_CONNMARK_RESTORE) { |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 120 | if (strcmp(par->table, "mangle") != 0) { |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 121 | printk(KERN_WARNING "CONNMARK: restore can only be " |
| 122 | "called from \"mangle\" table, not \"%s\"\n", |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 123 | par->table); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 124 | return false; |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 125 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 127 | if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) { |
| 128 | printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n"); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 129 | return false; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 130 | } |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 131 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Jan Engelhardt | 67b4af2 | 2007-12-01 00:01:50 +1100 | [diff] [blame] | 132 | printk(KERN_WARNING "can't load conntrack support for " |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 133 | "proto=%u\n", par->family); |
Jan Engelhardt | 67b4af2 | 2007-12-01 00:01:50 +1100 | [diff] [blame] | 134 | return false; |
| 135 | } |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 136 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | } |
| 138 | |
Jan Engelhardt | af5d6dc | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 139 | static bool connmark_tg_check(const struct xt_tgchk_param *par) |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 140 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 141 | if (nf_ct_l3proto_try_module_get(par->family) < 0) { |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 142 | printk(KERN_WARNING "cannot load conntrack support for " |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 143 | "proto=%u\n", par->family); |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 144 | return false; |
| 145 | } |
| 146 | return true; |
| 147 | } |
| 148 | |
Jan Engelhardt | a2df164 | 2008-10-08 11:35:19 +0200 | [diff] [blame] | 149 | static void connmark_tg_destroy(const struct xt_tgdtor_param *par) |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 150 | { |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 151 | nf_ct_l3proto_module_put(par->family); |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 152 | } |
| 153 | |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 154 | #ifdef CONFIG_COMPAT |
| 155 | struct compat_xt_connmark_target_info { |
| 156 | compat_ulong_t mark, mask; |
| 157 | u_int8_t mode; |
| 158 | u_int8_t __pad1; |
| 159 | u_int16_t __pad2; |
| 160 | }; |
| 161 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 162 | static void connmark_tg_compat_from_user_v0(void *dst, void *src) |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 163 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 164 | const struct compat_xt_connmark_target_info *cm = src; |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 165 | struct xt_connmark_target_info m = { |
| 166 | .mark = cm->mark, |
| 167 | .mask = cm->mask, |
| 168 | .mode = cm->mode, |
| 169 | }; |
| 170 | memcpy(dst, &m, sizeof(m)); |
| 171 | } |
| 172 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 173 | static int connmark_tg_compat_to_user_v0(void __user *dst, void *src) |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 174 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 175 | const struct xt_connmark_target_info *m = src; |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 176 | struct compat_xt_connmark_target_info cm = { |
| 177 | .mark = m->mark, |
| 178 | .mask = m->mask, |
| 179 | .mode = m->mode, |
| 180 | }; |
| 181 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 182 | } |
| 183 | #endif /* CONFIG_COMPAT */ |
| 184 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 185 | static struct xt_target connmark_tg_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 186 | { |
| 187 | .name = "CONNMARK", |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 188 | .revision = 0, |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 189 | .family = NFPROTO_UNSPEC, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 190 | .checkentry = connmark_tg_check_v0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 191 | .destroy = connmark_tg_destroy, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 192 | .target = connmark_tg_v0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 193 | .targetsize = sizeof(struct xt_connmark_target_info), |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 194 | #ifdef CONFIG_COMPAT |
| 195 | .compatsize = sizeof(struct compat_xt_connmark_target_info), |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 196 | .compat_from_user = connmark_tg_compat_from_user_v0, |
| 197 | .compat_to_user = connmark_tg_compat_to_user_v0, |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 198 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 199 | .me = THIS_MODULE |
| 200 | }, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 201 | { |
| 202 | .name = "CONNMARK", |
| 203 | .revision = 1, |
Jan Engelhardt | 92f3b2b | 2008-10-08 11:35:20 +0200 | [diff] [blame] | 204 | .family = NFPROTO_UNSPEC, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 205 | .checkentry = connmark_tg_check, |
| 206 | .target = connmark_tg, |
| 207 | .targetsize = sizeof(struct xt_connmark_tginfo1), |
| 208 | .destroy = connmark_tg_destroy, |
| 209 | .me = THIS_MODULE, |
| 210 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | }; |
| 212 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 213 | static int __init connmark_tg_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 215 | return xt_register_targets(connmark_tg_reg, |
| 216 | ARRAY_SIZE(connmark_tg_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 219 | static void __exit connmark_tg_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 221 | xt_unregister_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | } |
| 223 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 224 | module_init(connmark_tg_init); |
| 225 | module_exit(connmark_tg_exit); |