Commit | Line | Data |
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1da177e4 LT |
1 | /* Kernel module to match NFMARK values. */ |
2 | ||
3 | /* (C) 1999-2001 Marc Boucher <marc@mbsi.ca> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/module.h> | |
11 | #include <linux/skbuff.h> | |
12 | ||
2e4e6a17 HW |
13 | #include <linux/netfilter/xt_mark.h> |
14 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
15 | |
16 | MODULE_LICENSE("GPL"); | |
17 | MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); | |
18 | MODULE_DESCRIPTION("iptables mark matching module"); | |
2e4e6a17 HW |
19 | MODULE_ALIAS("ipt_mark"); |
20 | MODULE_ALIAS("ip6t_mark"); | |
1da177e4 | 21 | |
1d93a9cb | 22 | static bool |
1da177e4 LT |
23 | match(const struct sk_buff *skb, |
24 | const struct net_device *in, | |
25 | const struct net_device *out, | |
c4986734 | 26 | const struct xt_match *match, |
1da177e4 LT |
27 | const void *matchinfo, |
28 | int offset, | |
2e4e6a17 | 29 | unsigned int protoff, |
cff533ac | 30 | bool *hotdrop) |
1da177e4 | 31 | { |
2e4e6a17 | 32 | const struct xt_mark_info *info = matchinfo; |
1da177e4 | 33 | |
82e91ffe | 34 | return ((skb->mark & info->mask) == info->mark) ^ info->invert; |
1da177e4 LT |
35 | } |
36 | ||
ccb79bdc | 37 | static bool |
1da177e4 | 38 | checkentry(const char *tablename, |
601e68e1 | 39 | const void *entry, |
c4986734 | 40 | const struct xt_match *match, |
601e68e1 YH |
41 | void *matchinfo, |
42 | unsigned int hook_mask) | |
1da177e4 | 43 | { |
3e72b2fe | 44 | const struct xt_mark_info *minfo = matchinfo; |
bf3a46aa | 45 | |
bf3a46aa HW |
46 | if (minfo->mark > 0xffffffff || minfo->mask > 0xffffffff) { |
47 | printk(KERN_WARNING "mark: only supports 32bit mark\n"); | |
ccb79bdc | 48 | return false; |
bf3a46aa | 49 | } |
ccb79bdc | 50 | return true; |
1da177e4 LT |
51 | } |
52 | ||
bc80b656 PM |
53 | #ifdef CONFIG_COMPAT |
54 | struct compat_xt_mark_info { | |
55 | compat_ulong_t mark, mask; | |
56 | u_int8_t invert; | |
57 | u_int8_t __pad1; | |
58 | u_int16_t __pad2; | |
59 | }; | |
60 | ||
61 | static void compat_from_user(void *dst, void *src) | |
62 | { | |
a47362a2 | 63 | const struct compat_xt_mark_info *cm = src; |
bc80b656 PM |
64 | struct xt_mark_info m = { |
65 | .mark = cm->mark, | |
66 | .mask = cm->mask, | |
67 | .invert = cm->invert, | |
68 | }; | |
69 | memcpy(dst, &m, sizeof(m)); | |
70 | } | |
71 | ||
72 | static int compat_to_user(void __user *dst, void *src) | |
73 | { | |
a47362a2 | 74 | const struct xt_mark_info *m = src; |
bc80b656 PM |
75 | struct compat_xt_mark_info cm = { |
76 | .mark = m->mark, | |
77 | .mask = m->mask, | |
78 | .invert = m->invert, | |
79 | }; | |
80 | return copy_to_user(dst, &cm, sizeof(cm)) ? -EFAULT : 0; | |
81 | } | |
82 | #endif /* CONFIG_COMPAT */ | |
83 | ||
9f15c530 | 84 | static struct xt_match xt_mark_match[] __read_mostly = { |
4470bbc7 PM |
85 | { |
86 | .name = "mark", | |
87 | .family = AF_INET, | |
88 | .checkentry = checkentry, | |
89 | .match = match, | |
90 | .matchsize = sizeof(struct xt_mark_info), | |
bc80b656 PM |
91 | #ifdef CONFIG_COMPAT |
92 | .compatsize = sizeof(struct compat_xt_mark_info), | |
93 | .compat_from_user = compat_from_user, | |
94 | .compat_to_user = compat_to_user, | |
95 | #endif | |
4470bbc7 PM |
96 | .me = THIS_MODULE, |
97 | }, | |
98 | { | |
99 | .name = "mark", | |
100 | .family = AF_INET6, | |
101 | .checkentry = checkentry, | |
102 | .match = match, | |
103 | .matchsize = sizeof(struct xt_mark_info), | |
104 | .me = THIS_MODULE, | |
105 | }, | |
1da177e4 LT |
106 | }; |
107 | ||
65b4b4e8 | 108 | static int __init xt_mark_init(void) |
1da177e4 | 109 | { |
4470bbc7 | 110 | return xt_register_matches(xt_mark_match, ARRAY_SIZE(xt_mark_match)); |
1da177e4 LT |
111 | } |
112 | ||
65b4b4e8 | 113 | static void __exit xt_mark_fini(void) |
1da177e4 | 114 | { |
4470bbc7 | 115 | xt_unregister_matches(xt_mark_match, ARRAY_SIZE(xt_mark_match)); |
1da177e4 LT |
116 | } |
117 | ||
65b4b4e8 AM |
118 | module_init(xt_mark_init); |
119 | module_exit(xt_mark_fini); |