1 /*
2 * ebt_mark_m
3 *
4 * Authors:
5 * Bart De Schuymer <bdschuym@pandora.be>
6 *
7 * July, 2002
8 *
9 */
10
11 #include <linux/netfilter_bridge/ebtables.h>
12 #include <linux/netfilter_bridge/ebt_mark_m.h>
13 #include <linux/module.h>
14
15 static int ebt_filter_mark(const struct sk_buff *skb,
16 const struct net_device *in, const struct net_device *out, const void *data,
17 unsigned int datalen)
18 {
19 const struct ebt_mark_m_info *info = data;
20
21 if (info->bitmask & EBT_MARK_OR)
22 return !(!!(skb->mark & info->mask) ^ info->invert);
23 return !(((skb->mark & info->mask) == info->mark) ^ info->invert);
24 }
25
26 static int ebt_mark_check(const char *tablename, unsigned int hookmask,
27 const struct ebt_entry *e, void *data, unsigned int datalen)
28 {
29 const struct ebt_mark_m_info *info = data;
30
31 if (datalen != EBT_ALIGN(sizeof(struct ebt_mark_m_info)))
32 return -EINVAL;
33 if (info->bitmask & ~EBT_MARK_MASK)
34 return -EINVAL;
35 if ((info->bitmask & EBT_MARK_OR) && (info->bitmask & EBT_MARK_AND))
36 return -EINVAL;
37 if (!info->bitmask)
38 return -EINVAL;
39 return 0;
40 }
41
42 static struct ebt_match filter_mark __read_mostly = {
43 .name = EBT_MARK_MATCH,
44 .match = ebt_filter_mark,
45 .check = ebt_mark_check,
46 .me = THIS_MODULE,
47 };
48
49 static int __init ebt_mark_m_init(void)
50 {
51 return ebt_register_match(&filter_mark);
52 }
53
54 static void __exit ebt_mark_m_fini(void)
55 {
56 ebt_unregister_match(&filter_mark);
57 }
58
59 module_init(ebt_mark_m_init);
60 module_exit(ebt_mark_m_fini);
61 MODULE_DESCRIPTION("Ebtables: Packet mark match");
62 MODULE_LICENSE("GPL");
63
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