2 * iptables module to match inet_addr_type() of an ip.
4 * Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/skbuff.h>
14 #include <linux/netdevice.h>
16 #include <net/route.h>
18 #include <linux/netfilter_ipv4/ipt_addrtype.h>
19 #include <linux/netfilter/x_tables.h>
21 MODULE_LICENSE("GPL");
22 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
23 MODULE_DESCRIPTION("iptables addrtype match");
25 static inline int match_type(__be32 addr, u_int16_t mask)
27 return !!(mask & (1 << inet_addr_type(addr)));
30 static int match(const struct sk_buff *skb,
31 const struct net_device *in, const struct net_device *out,
32 const struct xt_match *match, const void *matchinfo,
33 int offset, unsigned int protoff, int *hotdrop)
35 const struct ipt_addrtype_info *info = matchinfo;
36 const struct iphdr *iph = skb->nh.iph;
40 ret &= match_type(iph->saddr, info->source)^info->invert_source;
42 ret &= match_type(iph->daddr, info->dest)^info->invert_dest;
47 static struct xt_match addrtype_match = {
51 .matchsize = sizeof(struct ipt_addrtype_info),
55 static int __init ipt_addrtype_init(void)
57 return xt_register_match(&addrtype_match);
60 static void __exit ipt_addrtype_fini(void)
62 xt_unregister_match(&addrtype_match);
65 module_init(ipt_addrtype_init);
66 module_exit(ipt_addrtype_fini);