Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* IP tables module for matching the routing realm |
1da177e4 LT |
2 | * |
3 | * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi> | |
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 | #include <linux/netdevice.h> | |
13 | #include <net/route.h> | |
14 | ||
2e4e6a17 HW |
15 | #include <linux/netfilter_ipv4.h> |
16 | #include <linux/netfilter/xt_realm.h> | |
17 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
18 | |
19 | MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>"); | |
20 | MODULE_LICENSE("GPL"); | |
2ae15b64 | 21 | MODULE_DESCRIPTION("Xtables: Routing realm match"); |
2e4e6a17 | 22 | MODULE_ALIAS("ipt_realm"); |
1da177e4 | 23 | |
1d93a9cb | 24 | static bool |
d3c5ee6d JE |
25 | realm_mt(const struct sk_buff *skb, const struct net_device *in, |
26 | const struct net_device *out, const struct xt_match *match, | |
27 | const void *matchinfo, int offset, unsigned int protoff, | |
28 | bool *hotdrop) | |
1da177e4 | 29 | { |
2e4e6a17 | 30 | const struct xt_realm_info *info = matchinfo; |
a47362a2 | 31 | const struct dst_entry *dst = skb->dst; |
601e68e1 | 32 | |
1da177e4 LT |
33 | return (info->id == (dst->tclassid & info->mask)) ^ info->invert; |
34 | } | |
35 | ||
d3c5ee6d | 36 | static struct xt_match realm_mt_reg __read_mostly = { |
1da177e4 | 37 | .name = "realm", |
d3c5ee6d | 38 | .match = realm_mt, |
5d04bff0 | 39 | .matchsize = sizeof(struct xt_realm_info), |
6e23ae2a PM |
40 | .hooks = (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_FORWARD) | |
41 | (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN), | |
a45049c5 | 42 | .family = AF_INET, |
1da177e4 LT |
43 | .me = THIS_MODULE |
44 | }; | |
45 | ||
d3c5ee6d | 46 | static int __init realm_mt_init(void) |
1da177e4 | 47 | { |
d3c5ee6d | 48 | return xt_register_match(&realm_mt_reg); |
1da177e4 LT |
49 | } |
50 | ||
d3c5ee6d | 51 | static void __exit realm_mt_exit(void) |
1da177e4 | 52 | { |
d3c5ee6d | 53 | xt_unregister_match(&realm_mt_reg); |
1da177e4 LT |
54 | } |
55 | ||
d3c5ee6d JE |
56 | module_init(realm_mt_init); |
57 | module_exit(realm_mt_exit); |