Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 1 | /* |
| 2 | * xt_MARK - Netfilter module to modify the NFMARK field of an skb |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 4 | * (C) 1999-2001 Marc Boucher <marc@mbsi.ca> |
| 5 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 |
| 6 | * Jan Engelhardt <jengelh@computergmbh.de> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License version 2 as |
| 10 | * published by the Free Software Foundation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/skbuff.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <net/checksum.h> |
| 17 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 18 | #include <linux/netfilter/x_tables.h> |
| 19 | #include <linux/netfilter/xt_MARK.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | MODULE_LICENSE("GPL"); |
| 22 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 23 | MODULE_DESCRIPTION("Xtables: packet mark modification"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 24 | MODULE_ALIAS("ipt_MARK"); |
| 25 | MODULE_ALIAS("ip6t_MARK"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
| 27 | static unsigned int |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 28 | mark_tg_v0(struct sk_buff *skb, const struct net_device *in, |
| 29 | const struct net_device *out, unsigned int hooknum, |
| 30 | const struct xt_target *target, const void *targinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 32 | const struct xt_mark_target_info *markinfo = targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 34 | skb->mark = markinfo->mark; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 35 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | } |
| 37 | |
| 38 | static unsigned int |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 39 | mark_tg_v1(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_mark_target_info_v1 *markinfo = targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | int mark = 0; |
| 45 | |
| 46 | switch (markinfo->mode) { |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 47 | case XT_MARK_SET: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | mark = markinfo->mark; |
| 49 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 50 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 51 | case XT_MARK_AND: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 52 | mark = skb->mark & markinfo->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | break; |
YOSHIFUJI Hideaki | 601e68e | 2007-02-12 11:15:49 -0800 | [diff] [blame] | 54 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 55 | case XT_MARK_OR: |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 56 | mark = skb->mark | markinfo->mark; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | break; |
| 58 | } |
| 59 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 60 | skb->mark = mark; |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 61 | return XT_CONTINUE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | } |
| 63 | |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 64 | static unsigned int |
| 65 | mark_tg(struct sk_buff *skb, const struct net_device *in, |
| 66 | const struct net_device *out, unsigned int hooknum, |
| 67 | const struct xt_target *target, const void *targinfo) |
| 68 | { |
| 69 | const struct xt_mark_tginfo2 *info = targinfo; |
| 70 | |
| 71 | skb->mark = (skb->mark & ~info->mask) ^ info->mark; |
| 72 | return XT_CONTINUE; |
| 73 | } |
| 74 | |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 75 | static bool |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 76 | mark_tg_check_v0(const char *tablename, const void *entry, |
| 77 | const struct xt_target *target, void *targinfo, |
| 78 | unsigned int hook_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 80 | const struct xt_mark_target_info *markinfo = targinfo; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 81 | |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 82 | if (markinfo->mark > 0xffffffff) { |
| 83 | printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n"); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 84 | return false; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 85 | } |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 86 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 89 | static bool |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 90 | mark_tg_check_v1(const char *tablename, const void *entry, |
| 91 | const struct xt_target *target, void *targinfo, |
| 92 | unsigned int hook_mask) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 94 | const struct xt_mark_target_info_v1 *markinfo = targinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 96 | if (markinfo->mode != XT_MARK_SET |
| 97 | && markinfo->mode != XT_MARK_AND |
| 98 | && markinfo->mode != XT_MARK_OR) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | printk(KERN_WARNING "MARK: unknown mode %u\n", |
| 100 | markinfo->mode); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 101 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 103 | if (markinfo->mark > 0xffffffff) { |
| 104 | printk(KERN_WARNING "MARK: Only supports 32bit wide mark\n"); |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 105 | return false; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 106 | } |
Jan Engelhardt | e1931b7 | 2007-07-07 22:16:26 -0700 | [diff] [blame] | 107 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 110 | #ifdef CONFIG_COMPAT |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 111 | struct compat_xt_mark_target_info { |
| 112 | compat_ulong_t mark; |
| 113 | }; |
| 114 | |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 115 | static void mark_tg_compat_from_user_v0(void *dst, void *src) |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 116 | { |
| 117 | const struct compat_xt_mark_target_info *cm = src; |
| 118 | struct xt_mark_target_info m = { |
| 119 | .mark = cm->mark, |
| 120 | }; |
| 121 | memcpy(dst, &m, sizeof(m)); |
| 122 | } |
| 123 | |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 124 | static int mark_tg_compat_to_user_v0(void __user *dst, void *src) |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 125 | { |
| 126 | const struct xt_mark_target_info *m = src; |
| 127 | struct compat_xt_mark_target_info cm = { |
| 128 | .mark = m->mark, |
| 129 | }; |
| 130 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 131 | } |
| 132 | |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 133 | struct compat_xt_mark_target_info_v1 { |
| 134 | compat_ulong_t mark; |
| 135 | u_int8_t mode; |
| 136 | u_int8_t __pad1; |
| 137 | u_int16_t __pad2; |
| 138 | }; |
| 139 | |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 140 | static void mark_tg_compat_from_user_v1(void *dst, void *src) |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 141 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 142 | const struct compat_xt_mark_target_info_v1 *cm = src; |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 143 | struct xt_mark_target_info_v1 m = { |
| 144 | .mark = cm->mark, |
| 145 | .mode = cm->mode, |
| 146 | }; |
| 147 | memcpy(dst, &m, sizeof(m)); |
| 148 | } |
| 149 | |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 150 | static int mark_tg_compat_to_user_v1(void __user *dst, void *src) |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 151 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 152 | const struct xt_mark_target_info_v1 *m = src; |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 153 | struct compat_xt_mark_target_info_v1 cm = { |
| 154 | .mark = m->mark, |
| 155 | .mode = m->mode, |
| 156 | }; |
| 157 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 158 | } |
| 159 | #endif /* CONFIG_COMPAT */ |
| 160 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 161 | static struct xt_target mark_tg_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 162 | { |
| 163 | .name = "MARK", |
| 164 | .family = AF_INET, |
| 165 | .revision = 0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 166 | .checkentry = mark_tg_check_v0, |
| 167 | .target = mark_tg_v0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 168 | .targetsize = sizeof(struct xt_mark_target_info), |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 169 | #ifdef CONFIG_COMPAT |
| 170 | .compatsize = sizeof(struct compat_xt_mark_target_info), |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 171 | .compat_from_user = mark_tg_compat_from_user_v0, |
| 172 | .compat_to_user = mark_tg_compat_to_user_v0, |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 173 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 174 | .table = "mangle", |
| 175 | .me = THIS_MODULE, |
| 176 | }, |
| 177 | { |
| 178 | .name = "MARK", |
| 179 | .family = AF_INET, |
| 180 | .revision = 1, |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 181 | .checkentry = mark_tg_check_v1, |
| 182 | .target = mark_tg_v1, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 183 | .targetsize = sizeof(struct xt_mark_target_info_v1), |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 184 | #ifdef CONFIG_COMPAT |
| 185 | .compatsize = sizeof(struct compat_xt_mark_target_info_v1), |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 186 | .compat_from_user = mark_tg_compat_from_user_v1, |
| 187 | .compat_to_user = mark_tg_compat_to_user_v1, |
Patrick McHardy | be7263b7 | 2006-09-20 12:06:10 -0700 | [diff] [blame] | 188 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 189 | .table = "mangle", |
| 190 | .me = THIS_MODULE, |
| 191 | }, |
| 192 | { |
| 193 | .name = "MARK", |
| 194 | .family = AF_INET6, |
| 195 | .revision = 0, |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 196 | .checkentry = mark_tg_check_v0, |
| 197 | .target = mark_tg_v0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 198 | .targetsize = sizeof(struct xt_mark_target_info), |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 199 | #ifdef CONFIG_COMPAT |
| 200 | .compatsize = sizeof(struct compat_xt_mark_target_info), |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 201 | .compat_from_user = mark_tg_compat_from_user_v0, |
| 202 | .compat_to_user = mark_tg_compat_to_user_v0, |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 203 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 204 | .table = "mangle", |
| 205 | .me = THIS_MODULE, |
| 206 | }, |
Patrick McHardy | 311af5c | 2007-12-17 21:51:14 -0800 | [diff] [blame] | 207 | { |
| 208 | .name = "MARK", |
| 209 | .family = AF_INET6, |
| 210 | .revision = 1, |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 211 | .checkentry = mark_tg_check_v1, |
| 212 | .target = mark_tg_v1, |
Patrick McHardy | 311af5c | 2007-12-17 21:51:14 -0800 | [diff] [blame] | 213 | .targetsize = sizeof(struct xt_mark_target_info_v1), |
| 214 | #ifdef CONFIG_COMPAT |
| 215 | .compatsize = sizeof(struct compat_xt_mark_target_info_v1), |
Patrick McHardy | 1fe5723 | 2007-12-17 21:51:33 -0800 | [diff] [blame] | 216 | .compat_from_user = mark_tg_compat_from_user_v1, |
| 217 | .compat_to_user = mark_tg_compat_to_user_v1, |
Patrick McHardy | 311af5c | 2007-12-17 21:51:14 -0800 | [diff] [blame] | 218 | #endif |
| 219 | .table = "mangle", |
| 220 | .me = THIS_MODULE, |
| 221 | }, |
Jan Engelhardt | e0a812a | 2008-01-14 23:38:52 -0800 | [diff] [blame] | 222 | { |
| 223 | .name = "MARK", |
| 224 | .revision = 2, |
| 225 | .family = AF_INET, |
| 226 | .target = mark_tg, |
| 227 | .targetsize = sizeof(struct xt_mark_tginfo2), |
| 228 | .me = THIS_MODULE, |
| 229 | }, |
| 230 | { |
| 231 | .name = "MARK", |
| 232 | .revision = 2, |
| 233 | .family = AF_INET6, |
| 234 | .target = mark_tg, |
| 235 | .targetsize = sizeof(struct xt_mark_tginfo2), |
| 236 | .me = THIS_MODULE, |
| 237 | }, |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 238 | }; |
| 239 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 240 | static int __init mark_tg_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 242 | return xt_register_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 245 | static void __exit mark_tg_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 247 | xt_unregister_targets(mark_tg_reg, ARRAY_SIZE(mark_tg_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 250 | module_init(mark_tg_init); |
| 251 | module_exit(mark_tg_exit); |