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 * $Id: ipt_realm.c,v 1.3 2004/03/05 13:25:40 laforge Exp $
4 *
5 * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12#include <linux/module.h>
13#include <linux/skbuff.h>
14#include <linux/netdevice.h>
15#include <net/route.h>
16
17#include <linux/netfilter_ipv4.h>
18#include <linux/netfilter/xt_realm.h>
19#include <linux/netfilter/x_tables.h>
20
21MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>");
22MODULE_LICENSE("GPL");
23MODULE_DESCRIPTION("X_tables realm match");
24MODULE_ALIAS("ipt_realm");
25
26static int
27match(const struct sk_buff *skb,
28 const struct net_device *in,
29 const struct net_device *out,
30 const struct xt_match *match,
31 const void *matchinfo,
32 int offset,
33 unsigned int protoff,
34 int *hotdrop)
35{
36 const struct xt_realm_info *info = matchinfo;
37 struct dst_entry *dst = skb->dst;
38
39 return (info->id == (dst->tclassid & info->mask)) ^ info->invert;
40}
41
42static struct xt_match realm_match = {
43 .name = "realm",
44 .match = match,
45 .matchsize = sizeof(struct xt_realm_info),
46 .hooks = (1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) |
47 (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN),
48 .family = AF_INET,
49 .me = THIS_MODULE
50};
51
52static int __init xt_realm_init(void)
53{
54 return xt_register_match(&realm_match);
55}
56
57static void __exit xt_realm_fini(void)
58{
59 xt_unregister_match(&realm_match);
60}
61
62module_init(xt_realm_init);
63module_exit(xt_realm_fini);