1 /*
2 * ebt_mark_m
3 *
4 * Authors:
5 * Bart De Schuymer <bdschuym@pandora.be>
6 *
7 * July, 2002
8 *
9 */
10 #include <linux/module.h>
11 #include <linux/netfilter/x_tables.h>
12 #include <linux/netfilter_bridge/ebtables.h>
13 #include <linux/netfilter_bridge/ebt_mark_m.h>
14
15 static bool
16 ebt_mark_mt(const struct sk_buff *skb, struct xt_action_param *par)
17 {
18 const struct ebt_mark_m_info *info = par->matchinfo;
19
20 if (info->bitmask & EBT_MARK_OR)
21 return !!(skb->mark & info->mask) ^ info->invert;
22 return ((skb->mark & info->mask) == info->mark) ^ info->invert;
23 }
24
25 static int ebt_mark_mt_check(const struct xt_mtchk_param *par)
26 {
27 const struct ebt_mark_m_info *info = par->matchinfo;
28
29 if (info->bitmask & ~EBT_MARK_MASK)
30 return -EINVAL;
31 if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
32 return -EINVAL;
33 if (!info->bitmask)
34 return -EINVAL;
35 return 0;
36 }
37
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
70 static struct xt_match ebt_mark_mt_reg __read_mostly = {
71 .name = "mark_m",
72 .revision = 0,
73 .family = NFPROTO_BRIDGE,
74 .match = ebt_mark_mt,
75 .checkentry = ebt_mark_mt_check,
76 .matchsize = sizeof(struct ebt_mark_m_info),
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
82 .me = THIS_MODULE,
83 };
84
85 static int __init ebt_mark_m_init(void)
86 {
87 return xt_register_match(&ebt_mark_mt_reg);
88 }
89
90 static void __exit ebt_mark_m_fini(void)
91 {
92 xt_unregister_match(&ebt_mark_mt_reg);
93 }
94
95 module_init(ebt_mark_m_init);
96 module_exit(ebt_mark_m_fini);
97 MODULE_DESCRIPTION("Ebtables: Packet mark match");
98 MODULE_LICENSE("GPL");
99
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