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 | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 39 | connmark_tg_v0(struct sk_buff *skb, const struct net_device *in, |
| 40 | const struct net_device *out, unsigned int hooknum, |
| 41 | const struct xt_target *target, const void *targinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 43 | const struct xt_connmark_target_info *markinfo = targinfo; |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 44 | struct nf_conn *ct; |
| 45 | enum ip_conntrack_info ctinfo; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 46 | u_int32_t diff; |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 47 | u_int32_t mark; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 48 | u_int32_t newmark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 50 | ct = nf_ct_get(skb, &ctinfo); |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 51 | if (ct) { |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 52 | switch(markinfo->mode) { |
| 53 | case XT_CONNMARK_SET: |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 54 | newmark = (ct->mark & ~markinfo->mask) | markinfo->mark; |
| 55 | if (newmark != ct->mark) { |
| 56 | ct->mark = newmark; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 57 | nf_conntrack_event_cache(IPCT_MARK, skb); |
Jan Engelhardt | 2822b0d | 2007-02-07 15:06:43 -0800 | [diff] [blame] | 58 | } |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 59 | break; |
| 60 | case XT_CONNMARK_SAVE: |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 61 | newmark = (ct->mark & ~markinfo->mask) | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 62 | (skb->mark & markinfo->mask); |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 63 | if (ct->mark != newmark) { |
| 64 | ct->mark = newmark; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 65 | nf_conntrack_event_cache(IPCT_MARK, skb); |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 66 | } |
| 67 | break; |
| 68 | case XT_CONNMARK_RESTORE: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 69 | mark = skb->mark; |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 70 | diff = (ct->mark ^ mark) & markinfo->mask; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 71 | skb->mark = mark ^ diff; |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 72 | break; |
Pablo Neira Ayuso | 2521c12 | 2006-08-22 00:31:24 -0700 | [diff] [blame] | 73 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | } |
| 75 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 76 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 79 | static unsigned int |
| 80 | connmark_tg(struct sk_buff *skb, const struct net_device *in, |
| 81 | const struct net_device *out, unsigned int hooknum, |
| 82 | const struct xt_target *target, const void *targinfo) |
| 83 | { |
| 84 | const struct xt_connmark_tginfo1 *info = targinfo; |
| 85 | enum ip_conntrack_info ctinfo; |
| 86 | struct nf_conn *ct; |
| 87 | u_int32_t newmark; |
| 88 | |
| 89 | ct = nf_ct_get(skb, &ctinfo); |
| 90 | if (ct == NULL) |
| 91 | return XT_CONTINUE; |
| 92 | |
| 93 | switch (info->mode) { |
| 94 | case XT_CONNMARK_SET: |
| 95 | newmark = (ct->mark & ~info->ctmask) ^ info->ctmark; |
| 96 | if (ct->mark != newmark) { |
| 97 | ct->mark = newmark; |
| 98 | nf_conntrack_event_cache(IPCT_MARK, skb); |
| 99 | } |
| 100 | break; |
| 101 | case XT_CONNMARK_SAVE: |
| 102 | newmark = (ct->mark & ~info->ctmask) ^ |
| 103 | (skb->mark & info->nfmask); |
| 104 | if (ct->mark != newmark) { |
| 105 | ct->mark = newmark; |
| 106 | nf_conntrack_event_cache(IPCT_MARK, skb); |
| 107 | } |
| 108 | break; |
| 109 | case XT_CONNMARK_RESTORE: |
| 110 | newmark = (skb->mark & ~info->nfmask) ^ |
| 111 | (ct->mark & info->ctmask); |
| 112 | skb->mark = newmark; |
| 113 | break; |
| 114 | } |
| 115 | |
| 116 | return XT_CONTINUE; |
| 117 | } |
| 118 | |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 119 | static bool |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 120 | connmark_tg_check_v0(const char *tablename, const void *entry, |
| 121 | const struct xt_target *target, void *targinfo, |
| 122 | unsigned int hook_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 124 | const struct xt_connmark_target_info *matchinfo = targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 126 | if (matchinfo->mode == XT_CONNMARK_RESTORE) { |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 127 | if (strcmp(tablename, "mangle") != 0) { |
| 128 | printk(KERN_WARNING "CONNMARK: restore can only be " |
| 129 | "called from \"mangle\" table, not \"%s\"\n", |
| 130 | tablename); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 131 | return false; |
Patrick McHardy | 90528e6 | 2006-08-22 00:33:26 -0700 | [diff] [blame] | 132 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 134 | if (matchinfo->mark > 0xffffffff || matchinfo->mask > 0xffffffff) { |
| 135 | printk(KERN_WARNING "CONNMARK: Only supports 32bit mark\n"); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 136 | return false; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 137 | } |
Jan Engelhardt | 67b4af2 | 2007-12-01 00:01:50 +1100 | [diff] [blame] | 138 | if (nf_ct_l3proto_try_module_get(target->family) < 0) { |
| 139 | printk(KERN_WARNING "can't load conntrack support for " |
Jan Engelhardt | df54aae | 2007-12-17 22:43:15 -0800 | [diff] [blame] | 140 | "proto=%u\n", target->family); |
Jan Engelhardt | 67b4af2 | 2007-12-01 00:01:50 +1100 | [diff] [blame] | 141 | return false; |
| 142 | } |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 143 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 146 | static bool |
| 147 | connmark_tg_check(const char *tablename, const void *entry, |
| 148 | const struct xt_target *target, void *targinfo, |
| 149 | unsigned int hook_mask) |
| 150 | { |
| 151 | if (nf_ct_l3proto_try_module_get(target->family) < 0) { |
| 152 | printk(KERN_WARNING "cannot load conntrack support for " |
| 153 | "proto=%u\n", target->family); |
| 154 | return false; |
| 155 | } |
| 156 | return true; |
| 157 | } |
| 158 | |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 159 | static void |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 160 | connmark_tg_destroy(const struct xt_target *target, void *targinfo) |
Yasuyuki Kozakai | 11078c3 | 2006-12-12 00:29:02 -0800 | [diff] [blame] | 161 | { |
| 162 | nf_ct_l3proto_module_put(target->family); |
| 163 | } |
| 164 | |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 165 | #ifdef CONFIG_COMPAT |
| 166 | struct compat_xt_connmark_target_info { |
| 167 | compat_ulong_t mark, mask; |
| 168 | u_int8_t mode; |
| 169 | u_int8_t __pad1; |
| 170 | u_int16_t __pad2; |
| 171 | }; |
| 172 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 173 | static void connmark_tg_compat_from_user_v0(void *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 compat_xt_connmark_target_info *cm = src; |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 176 | struct xt_connmark_target_info m = { |
| 177 | .mark = cm->mark, |
| 178 | .mask = cm->mask, |
| 179 | .mode = cm->mode, |
| 180 | }; |
| 181 | memcpy(dst, &m, sizeof(m)); |
| 182 | } |
| 183 | |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 184 | 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] | 185 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 186 | const struct xt_connmark_target_info *m = src; |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 187 | struct compat_xt_connmark_target_info cm = { |
| 188 | .mark = m->mark, |
| 189 | .mask = m->mask, |
| 190 | .mode = m->mode, |
| 191 | }; |
| 192 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 193 | } |
| 194 | #endif /* CONFIG_COMPAT */ |
| 195 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 196 | static struct xt_target connmark_tg_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 197 | { |
| 198 | .name = "CONNMARK", |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 199 | .revision = 0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 200 | .family = AF_INET, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 201 | .checkentry = connmark_tg_check_v0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 202 | .destroy = connmark_tg_destroy, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 203 | .target = connmark_tg_v0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 204 | .targetsize = sizeof(struct xt_connmark_target_info), |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 205 | #ifdef CONFIG_COMPAT |
| 206 | .compatsize = sizeof(struct compat_xt_connmark_target_info), |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 207 | .compat_from_user = connmark_tg_compat_from_user_v0, |
| 208 | .compat_to_user = connmark_tg_compat_to_user_v0, |
Patrick McHardy | 7ce975b | 2006-09-20 12:06:40 -0700 | [diff] [blame] | 209 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 210 | .me = THIS_MODULE |
| 211 | }, |
| 212 | { |
| 213 | .name = "CONNMARK", |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 214 | .revision = 0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 215 | .family = AF_INET6, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 216 | .checkentry = connmark_tg_check_v0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 217 | .destroy = connmark_tg_destroy, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 218 | .target = connmark_tg_v0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 219 | .targetsize = sizeof(struct xt_connmark_target_info), |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 220 | #ifdef CONFIG_COMPAT |
| 221 | .compatsize = sizeof(struct compat_xt_connmark_target_info), |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 222 | .compat_from_user = connmark_tg_compat_from_user_v0, |
| 223 | .compat_to_user = connmark_tg_compat_to_user_v0, |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 224 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 225 | .me = THIS_MODULE |
| 226 | }, |
Jan Engelhardt | 0dc8c76 | 2008-01-14 23:38:34 -0800 | [diff] [blame] | 227 | { |
| 228 | .name = "CONNMARK", |
| 229 | .revision = 1, |
| 230 | .family = AF_INET, |
| 231 | .checkentry = connmark_tg_check, |
| 232 | .target = connmark_tg, |
| 233 | .targetsize = sizeof(struct xt_connmark_tginfo1), |
| 234 | .destroy = connmark_tg_destroy, |
| 235 | .me = THIS_MODULE, |
| 236 | }, |
| 237 | { |
| 238 | .name = "CONNMARK", |
| 239 | .revision = 1, |
| 240 | .family = AF_INET6, |
| 241 | .checkentry = connmark_tg_check, |
| 242 | .target = connmark_tg, |
| 243 | .targetsize = sizeof(struct xt_connmark_tginfo1), |
| 244 | .destroy = connmark_tg_destroy, |
| 245 | .me = THIS_MODULE, |
| 246 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | }; |
| 248 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 249 | static int __init connmark_tg_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 251 | return xt_register_targets(connmark_tg_reg, |
| 252 | ARRAY_SIZE(connmark_tg_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | } |
| 254 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 255 | static void __exit connmark_tg_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 257 | xt_unregister_targets(connmark_tg_reg, ARRAY_SIZE(connmark_tg_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
| 259 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 260 | module_init(connmark_tg_init); |
| 261 | module_exit(connmark_tg_exit); |