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_ipv4/ip_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(u_int32_t addr, u_int16_t mask)
27 return !!(mask & (1 << inet_addr_type(addr)));
30 static int match(const struct sk_buff *skb, const struct net_device *in,
31 const struct net_device *out, const void *matchinfo,
32 int offset, unsigned int protoff, int *hotdrop)
34 const struct ipt_addrtype_info *info = matchinfo;
35 const struct iphdr *iph = skb->nh.iph;
39 ret &= match_type(iph->saddr, info->source)^info->invert_source;
41 ret &= match_type(iph->daddr, info->dest)^info->invert_dest;
46 static int checkentry(const char *tablename, const void *ip,
47 void *matchinfo, unsigned int matchsize,
48 unsigned int hook_mask)
50 if (matchsize != IPT_ALIGN(sizeof(struct ipt_addrtype_info))) {
51 printk(KERN_ERR "ipt_addrtype: invalid size (%u != %Zu)\n",
52 matchsize, IPT_ALIGN(sizeof(struct ipt_addrtype_info)));
59 static struct ipt_match addrtype_match = {
62 .checkentry = checkentry,
66 static int __init init(void)
68 return ipt_register_match(&addrtype_match);
71 static void __exit fini(void)
73 ipt_unregister_match(&addrtype_match);