tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* IP tables module for matching the routing realm
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
15#include <linux/netfilter_ipv4.h>
16#include <linux/netfilter/xt_realm.h>
17#include <linux/netfilter/x_tables.h>
18
19MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
20MODULE_LICENSE("GPL");
21MODULE_DESCRIPTION("Xtables: Routing realm match");
22MODULE_ALIAS("ipt_realm");
23
24static bool
25realm_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)
29{
30 const struct xt_realm_info *info = matchinfo;
31 const struct dst_entry *dst = skb->dst;
32
33 return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
34}
35
36static struct xt_match realm_mt_reg __read_mostly = {
37 .name = "realm",
38 .match = realm_mt,
39 .matchsize = sizeof(struct xt_realm_info),
40 .hooks = (1 << NF_INET_POST_ROUTING) | (1 << NF_INET_FORWARD) |
41 (1 << NF_INET_LOCAL_OUT) | (1 << NF_INET_LOCAL_IN),
42 .family = AF_INET,
43 .me = THIS_MODULE
44};
45
46static int __init realm_mt_init(void)
47{
48 return xt_register_match(&realm_mt_reg);
49}
50
51static void __exit realm_mt_exit(void)
52{
53 xt_unregister_match(&realm_mt_reg);
54}
55
56module_init(realm_mt_init);
57module_exit(realm_mt_exit);