Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 1 | /* |
| 2 | * xt_mark - Netfilter module to match NFMARK value |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -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 | |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 16 | #include <linux/netfilter/xt_mark.h> |
| 17 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
| 19 | MODULE_LICENSE("GPL"); |
| 20 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
Jan Engelhardt | 2ae15b6 | 2008-01-14 23:42:28 -0800 | [diff] [blame] | 21 | MODULE_DESCRIPTION("Xtables: packet mark match"); |
Harald Welte | 2e4e6a1 | 2006-01-12 13:30:04 -0800 | [diff] [blame] | 22 | MODULE_ALIAS("ipt_mark"); |
| 23 | MODULE_ALIAS("ip6t_mark"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
Jan Engelhardt | 1d93a9c | 2007-07-07 22:15:35 -0700 | [diff] [blame] | 25 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 26 | mark_mt_v0(const struct sk_buff *skb, const struct xt_match_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 28 | const struct xt_mark_info *info = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | |
Thomas Graf | 82e91ff | 2006-11-09 15:19:14 -0800 | [diff] [blame] | 30 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | } |
| 32 | |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 33 | static bool |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 34 | mark_mt(const struct sk_buff *skb, const struct xt_match_param *par) |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 35 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 36 | const struct xt_mark_mtinfo1 *info = par->matchinfo; |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 37 | |
| 38 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
| 39 | } |
| 40 | |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 41 | static bool mark_mt_check_v0(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 43 | const struct xt_mark_info *minfo = par->matchinfo; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 44 | |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 45 | if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) { |
| 46 | printk(KERN_WARNING "mark: only supports 32bit mark\n"); |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 47 | return false; |
Harald Welte | bf3a46a | 2005-08-09 19:22:01 -0700 | [diff] [blame] | 48 | } |
Jan Engelhardt | ccb79bd | 2007-07-07 22:16:00 -0700 | [diff] [blame] | 49 | return true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
| 51 | |
Patrick McHardy | bc80b65 | 2006-09-20 12:05:54 -0700 | [diff] [blame] | 52 | #ifdef CONFIG_COMPAT |
| 53 | struct compat_xt_mark_info { |
| 54 | compat_ulong_t mark, mask; |
| 55 | u_int8_t invert; |
| 56 | u_int8_t __pad1; |
| 57 | u_int16_t __pad2; |
| 58 | }; |
| 59 | |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 60 | static void mark_mt_compat_from_user_v0(void *dst, void *src) |
Patrick McHardy | bc80b65 | 2006-09-20 12:05:54 -0700 | [diff] [blame] | 61 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 62 | const struct compat_xt_mark_info *cm = src; |
Patrick McHardy | bc80b65 | 2006-09-20 12:05:54 -0700 | [diff] [blame] | 63 | struct xt_mark_info m = { |
| 64 | .mark = cm->mark, |
| 65 | .mask = cm->mask, |
| 66 | .invert = cm->invert, |
| 67 | }; |
| 68 | memcpy(dst, &m, sizeof(m)); |
| 69 | } |
| 70 | |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 71 | static int mark_mt_compat_to_user_v0(void __user *dst, void *src) |
Patrick McHardy | bc80b65 | 2006-09-20 12:05:54 -0700 | [diff] [blame] | 72 | { |
Jan Engelhardt | a47362a | 2007-07-07 22:16:55 -0700 | [diff] [blame] | 73 | const struct xt_mark_info *m = src; |
Patrick McHardy | bc80b65 | 2006-09-20 12:05:54 -0700 | [diff] [blame] | 74 | struct compat_xt_mark_info cm = { |
| 75 | .mark = m->mark, |
| 76 | .mask = m->mask, |
| 77 | .invert = m->invert, |
| 78 | }; |
| 79 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; |
| 80 | } |
| 81 | #endif /* CONFIG_COMPAT */ |
| 82 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 83 | static struct xt_match mark_mt_reg[] __read_mostly = { |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 84 | { |
| 85 | .name = "mark", |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 86 | .revision = 0, |
Jan Engelhardt | 55b69e9 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 87 | .family = NFPROTO_UNSPEC, |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 88 | .checkentry = mark_mt_check_v0, |
| 89 | .match = mark_mt_v0, |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 90 | .matchsize = sizeof(struct xt_mark_info), |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 91 | #ifdef CONFIG_COMPAT |
| 92 | .compatsize = sizeof(struct compat_xt_mark_info), |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 93 | .compat_from_user = mark_mt_compat_from_user_v0, |
| 94 | .compat_to_user = mark_mt_compat_to_user_v0, |
Patrick McHardy | 34f4c42 | 2007-12-17 21:50:53 -0800 | [diff] [blame] | 95 | #endif |
Patrick McHardy | 4470bbc | 2006-08-22 00:34:04 -0700 | [diff] [blame] | 96 | .me = THIS_MODULE, |
| 97 | }, |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 98 | { |
| 99 | .name = "mark", |
| 100 | .revision = 1, |
Jan Engelhardt | 55b69e9 | 2008-10-08 11:35:01 +0200 | [diff] [blame] | 101 | .family = NFPROTO_UNSPEC, |
Jan Engelhardt | 17b0d7e | 2008-01-14 23:41:11 -0800 | [diff] [blame] | 102 | .match = mark_mt, |
| 103 | .matchsize = sizeof(struct xt_mark_mtinfo1), |
| 104 | .me = THIS_MODULE, |
| 105 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | }; |
| 107 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 108 | static int __init mark_mt_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 110 | return xt_register_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | } |
| 112 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 113 | static void __exit mark_mt_exit(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 114 | { |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 115 | xt_unregister_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
Jan Engelhardt | d3c5ee6 | 2007-12-04 23:24:03 -0800 | [diff] [blame] | 118 | module_init(mark_mt_init); |
| 119 | module_exit(mark_mt_exit); |