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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * ebt_mark_m | |
3 | * | |
4 | * Authors: | |
5 | * Bart De Schuymer <bdschuym@pandora.be> | |
6 | * | |
7 | * July, 2002 | |
8 | * | |
9 | */ | |
18219d3f JE |
10 | #include <linux/module.h> |
11 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
12 | #include <linux/netfilter_bridge/ebtables.h> |
13 | #include <linux/netfilter_bridge/ebt_mark_m.h> | |
1da177e4 | 14 | |
2d06d4a5 | 15 | static bool |
4b560b44 | 16 | ebt_mark_mt(const struct sk_buff *skb, const struct xt_action_param *par) |
1da177e4 | 17 | { |
f7108a20 | 18 | const struct ebt_mark_m_info *info = par->matchinfo; |
1da177e4 LT |
19 | |
20 | if (info->bitmask & EBT_MARK_OR) | |
8cc784ee JE |
21 | return !!(skb->mark & info->mask) ^ info->invert; |
22 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; | |
1da177e4 LT |
23 | } |
24 | ||
b0f38452 | 25 | static int ebt_mark_mt_check(const struct xt_mtchk_param *par) |
1da177e4 | 26 | { |
9b4fce7a | 27 | const struct ebt_mark_m_info *info = par->matchinfo; |
1da177e4 | 28 | |
1da177e4 | 29 | if (info->bitmask & ~EBT_MARK_MASK) |
bd414ee6 | 30 | return -EINVAL; |
1da177e4 | 31 | if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND)) |
bd414ee6 | 32 | return -EINVAL; |
1da177e4 | 33 | if (!info->bitmask) |
bd414ee6 JE |
34 | return -EINVAL; |
35 | return 0; | |
1da177e4 LT |
36 | } |
37 | ||
6e705f56 FW |
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 | ||
043ef46c JE |
70 | static struct xt_match ebt_mark_mt_reg __read_mostly = { |
71 | .name = "mark_m", | |
001a18d3 JE |
72 | .revision = 0, |
73 | .family = NFPROTO_BRIDGE, | |
2d06d4a5 JE |
74 | .match = ebt_mark_mt, |
75 | .checkentry = ebt_mark_mt_check, | |
fc0e3df4 | 76 | .matchsize = sizeof(struct ebt_mark_m_info), |
6e705f56 FW |
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 | |
1da177e4 LT |
82 | .me = THIS_MODULE, |
83 | }; | |
84 | ||
65b4b4e8 | 85 | static int __init ebt_mark_m_init(void) |
1da177e4 | 86 | { |
043ef46c | 87 | return xt_register_match(&ebt_mark_mt_reg); |
1da177e4 LT |
88 | } |
89 | ||
65b4b4e8 | 90 | static void __exit ebt_mark_m_fini(void) |
1da177e4 | 91 | { |
043ef46c | 92 | xt_unregister_match(&ebt_mark_mt_reg); |
1da177e4 LT |
93 | } |
94 | ||
65b4b4e8 AM |
95 | module_init(ebt_mark_m_init); |
96 | module_exit(ebt_mark_m_fini); | |
f776c4cd | 97 | MODULE_DESCRIPTION("Ebtables: Packet mark match"); |
1da177e4 | 98 | MODULE_LICENSE("GPL"); |