Commit | Line | Data |
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17b0d7ef JE |
1 | /* |
2 | * xt_mark - Netfilter module to match NFMARK value | |
3 | * | |
4 | * (C) 1999-2001 Marc Boucher <marc@mbsi.ca> | |
5 | * Copyright © CC Computer Consultants GmbH, 2007 - 2008 | |
6 | * Jan Engelhardt <jengelh@computergmbh.de> | |
1da177e4 | 7 | * |
17b0d7ef JE |
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. | |
1da177e4 LT |
11 | */ |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/skbuff.h> | |
15 | ||
2e4e6a17 HW |
16 | #include <linux/netfilter/xt_mark.h> |
17 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
18 | |
19 | MODULE_LICENSE("GPL"); | |
20 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
2ae15b64 | 21 | MODULE_DESCRIPTION("Xtables: packet mark match"); |
2e4e6a17 HW |
22 | MODULE_ALIAS("ipt_mark"); |
23 | MODULE_ALIAS("ip6t_mark"); | |
1da177e4 | 24 | |
17b0d7ef JE |
25 | static bool |
26 | mark_mt_v0(const struct sk_buff *skb, const struct net_device *in, | |
27 | const struct net_device *out, const struct xt_match *match, | |
28 | const void *matchinfo, int offset, unsigned int protoff, | |
29 | bool *hotdrop) | |
30 | { | |
31 | const struct xt_mark_info *info = matchinfo; | |
32 | ||
33 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; | |
34 | } | |
35 | ||
1d93a9cb | 36 | static bool |
d3c5ee6d JE |
37 | mark_mt(const struct sk_buff *skb, const struct net_device *in, |
38 | const struct net_device *out, const struct xt_match *match, | |
39 | const void *matchinfo, int offset, unsigned int protoff, bool *hotdrop) | |
1da177e4 | 40 | { |
17b0d7ef | 41 | const struct xt_mark_mtinfo1 *info = matchinfo; |
1da177e4 | 42 | |
82e91ffe | 43 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
1da177e4 LT |
44 | } |
45 | ||
ccb79bdc | 46 | static bool |
17b0d7ef JE |
47 | mark_mt_check_v0(const char *tablename, const void *entry, |
48 | const struct xt_match *match, void *matchinfo, | |
49 | unsigned int hook_mask) | |
1da177e4 | 50 | { |
3e72b2fe | 51 | const struct xt_mark_info *minfo = matchinfo; |
bf3a46aa | 52 | |
bf3a46aa HW |
53 | if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) { |
54 | printk(KERN_WARNING "mark: only supports 32bit mark\n"); | |
ccb79bdc | 55 | return false; |
bf3a46aa | 56 | } |
ccb79bdc | 57 | return true; |
1da177e4 LT |
58 | } |
59 | ||
bc80b656 PM |
60 | #ifdef CONFIG_COMPAT |
61 | struct compat_xt_mark_info { | |
62 | compat_ulong_t mark, mask; | |
63 | u_int8_t invert; | |
64 | u_int8_t __pad1; | |
65 | u_int16_t __pad2; | |
66 | }; | |
67 | ||
17b0d7ef | 68 | static void mark_mt_compat_from_user_v0(void *dst, void *src) |
bc80b656 | 69 | { |
a47362a2 | 70 | const struct compat_xt_mark_info *cm = src; |
bc80b656 PM |
71 | struct xt_mark_info m = { |
72 | .mark = cm->mark, | |
73 | .mask = cm->mask, | |
74 | .invert = cm->invert, | |
75 | }; | |
76 | memcpy(dst, &m, sizeof(m)); | |
77 | } | |
78 | ||
17b0d7ef | 79 | static int mark_mt_compat_to_user_v0(void __user *dst, void *src) |
bc80b656 | 80 | { |
a47362a2 | 81 | const struct xt_mark_info *m = src; |
bc80b656 PM |
82 | struct compat_xt_mark_info cm = { |
83 | .mark = m->mark, | |
84 | .mask = m->mask, | |
85 | .invert = m->invert, | |
86 | }; | |
87 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
88 | } | |
89 | #endif /* CONFIG_COMPAT */ | |
90 | ||
d3c5ee6d | 91 | static struct xt_match mark_mt_reg[] __read_mostly = { |
4470bbc7 PM |
92 | { |
93 | .name = "mark", | |
17b0d7ef | 94 | .revision = 0, |
4470bbc7 | 95 | .family = AF_INET, |
17b0d7ef JE |
96 | .checkentry = mark_mt_check_v0, |
97 | .match = mark_mt_v0, | |
4470bbc7 | 98 | .matchsize = sizeof(struct xt_mark_info), |
bc80b656 PM |
99 | #ifdef CONFIG_COMPAT |
100 | .compatsize = sizeof(struct compat_xt_mark_info), | |
17b0d7ef JE |
101 | .compat_from_user = mark_mt_compat_from_user_v0, |
102 | .compat_to_user = mark_mt_compat_to_user_v0, | |
bc80b656 | 103 | #endif |
4470bbc7 PM |
104 | .me = THIS_MODULE, |
105 | }, | |
106 | { | |
107 | .name = "mark", | |
17b0d7ef | 108 | .revision = 0, |
4470bbc7 | 109 | .family = AF_INET6, |
17b0d7ef JE |
110 | .checkentry = mark_mt_check_v0, |
111 | .match = mark_mt_v0, | |
4470bbc7 | 112 | .matchsize = sizeof(struct xt_mark_info), |
34f4c429 PM |
113 | #ifdef CONFIG_COMPAT |
114 | .compatsize = sizeof(struct compat_xt_mark_info), | |
17b0d7ef JE |
115 | .compat_from_user = mark_mt_compat_from_user_v0, |
116 | .compat_to_user = mark_mt_compat_to_user_v0, | |
34f4c429 | 117 | #endif |
4470bbc7 PM |
118 | .me = THIS_MODULE, |
119 | }, | |
17b0d7ef JE |
120 | { |
121 | .name = "mark", | |
122 | .revision = 1, | |
123 | .family = AF_INET, | |
124 | .match = mark_mt, | |
125 | .matchsize = sizeof(struct xt_mark_mtinfo1), | |
126 | .me = THIS_MODULE, | |
127 | }, | |
128 | { | |
129 | .name = "mark", | |
130 | .revision = 1, | |
131 | .family = AF_INET6, | |
132 | .match = mark_mt, | |
133 | .matchsize = sizeof(struct xt_mark_mtinfo1), | |
134 | .me = THIS_MODULE, | |
135 | }, | |
1da177e4 LT |
136 | }; |
137 | ||
d3c5ee6d | 138 | static int __init mark_mt_init(void) |
1da177e4 | 139 | { |
d3c5ee6d | 140 | return xt_register_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg)); |
1da177e4 LT |
141 | } |
142 | ||
d3c5ee6d | 143 | static void __exit mark_mt_exit(void) |
1da177e4 | 144 | { |
d3c5ee6d | 145 | xt_unregister_matches(mark_mt_reg, ARRAY_SIZE(mark_mt_reg)); |
1da177e4 LT |
146 | } |
147 | ||
d3c5ee6d JE |
148 | module_init(mark_mt_init); |
149 | module_exit(mark_mt_exit); |