Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ebt_mark_m |
| 3 | * |
| 4 | * Authors: |
| 5 | * Bart De Schuymer <bdschuym@pandora.be> |
| 6 | * |
| 7 | * July, 2002 |
| 8 | * |
| 9 | */ |
Jan Engelhardt | 18219d3 | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/netfilter/x_tables.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/netfilter_bridge/ebtables.h> |
| 13 | #include <linux/netfilter_bridge/ebt_mark_m.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 15 | static bool |
Jan Engelhardt | 62fc805 | 2009-07-07 20:42:08 +0200 | [diff] [blame] | 16 | ebt_mark_mt(const struct sk_buff *skb, struct xt_action_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | { |
Jan Engelhardt | f7108a2 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 18 | const struct ebt_mark_m_info *info = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
| 20 | if (info->bitmask & EBT_MARK_OR) |
Jan Engelhardt | 8cc784e | 2008-10-08 11:35:13 +0200 | [diff] [blame] | 21 | return !!(skb->mark & info->mask) ^ info->invert; |
| 22 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | } |
| 24 | |
Jan Engelhardt | b0f3845 | 2010-03-19 17:16:42 +0100 | [diff] [blame] | 25 | static int ebt_mark_mt_check(const struct xt_mtchk_param *par) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | { |
Jan Engelhardt | 9b4fce7 | 2008-10-08 11:35:18 +0200 | [diff] [blame] | 27 | const struct ebt_mark_m_info *info = par->matchinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | if (info->bitmask & ~EBT_MARK_MASK) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 30 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND)) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 32 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | if (!info->bitmask) |
Jan Engelhardt | bd414ee | 2010-03-23 16:35:56 +0100 | [diff] [blame] | 34 | return -EINVAL; |
| 35 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | } |
| 37 | |
Florian Westphal | 6e705f5 | 2010-01-27 14:39:05 +0100 | [diff] [blame] | 38 | |
| 39 | #ifdef CONFIG_COMPAT |
| 40 | struct compat_ebt_mark_m_info { |
| 41 | compat_ulong_t mark, mask; |
| 42 | uint8_t invert, bitmask; |
| 43 | }; |
| 44 | |
| 45 | static void mark_mt_compat_from_user(void *dst, const void *src) |
| 46 | { |
| 47 | const struct compat_ebt_mark_m_info *user = src; |
| 48 | struct ebt_mark_m_info *kern = dst; |
| 49 | |
| 50 | kern->mark = user->mark; |
| 51 | kern->mask = user->mask; |
| 52 | kern->invert = user->invert; |
| 53 | kern->bitmask = user->bitmask; |
| 54 | } |
| 55 | |
| 56 | static int mark_mt_compat_to_user(void __user *dst, const void *src) |
| 57 | { |
| 58 | struct compat_ebt_mark_m_info __user *user = dst; |
| 59 | const struct ebt_mark_m_info *kern = src; |
| 60 | |
| 61 | if (put_user(kern->mark, &user->mark) || |
| 62 | put_user(kern->mask, &user->mask) || |
| 63 | put_user(kern->invert, &user->invert) || |
| 64 | put_user(kern->bitmask, &user->bitmask)) |
| 65 | return -EFAULT; |
| 66 | return 0; |
| 67 | } |
| 68 | #endif |
| 69 | |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 70 | static struct xt_match ebt_mark_mt_reg __read_mostly = { |
| 71 | .name = "mark_m", |
Jan Engelhardt | 001a18d | 2008-10-08 11:35:14 +0200 | [diff] [blame] | 72 | .revision = 0, |
| 73 | .family = NFPROTO_BRIDGE, |
Jan Engelhardt | 2d06d4a | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 74 | .match = ebt_mark_mt, |
| 75 | .checkentry = ebt_mark_mt_check, |
Florian Westphal | fc0e3df | 2010-02-15 18:16:26 +0100 | [diff] [blame] | 76 | .matchsize = sizeof(struct ebt_mark_m_info), |
Florian Westphal | 6e705f5 | 2010-01-27 14:39:05 +0100 | [diff] [blame] | 77 | #ifdef CONFIG_COMPAT |
| 78 | .compatsize = sizeof(struct compat_ebt_mark_m_info), |
| 79 | .compat_from_user = mark_mt_compat_from_user, |
| 80 | .compat_to_user = mark_mt_compat_to_user, |
| 81 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | .me = THIS_MODULE, |
| 83 | }; |
| 84 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 85 | static int __init ebt_mark_m_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | { |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 87 | return xt_register_match(&ebt_mark_mt_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | } |
| 89 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 90 | static void __exit ebt_mark_m_fini(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | { |
Jan Engelhardt | 043ef46 | 2008-10-08 11:35:15 +0200 | [diff] [blame] | 92 | xt_unregister_match(&ebt_mark_mt_reg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Andrew Morton | 65b4b4e | 2006-03-28 16:37:06 -0800 | [diff] [blame] | 95 | module_init(ebt_mark_m_init); |
| 96 | module_exit(ebt_mark_m_fini); |
Jan Engelhardt | f776c4c | 2008-01-31 04:00:30 -0800 | [diff] [blame] | 97 | MODULE_DESCRIPTION("Ebtables: Packet mark match"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | MODULE_LICENSE("GPL"); |