1 /*
2 * iptables module to match inet_addr_type() of an ip.
3 *
4 * Copyright (c) 2004 Patrick McHardy <kaber@trash.net>
5 *
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.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/skbuff.h>
14 #include <linux/netdevice.h>
15 #include <linux/ip.h>
16 #include <net/route.h>
17
18 #include <linux/netfilter_ipv4/ipt_addrtype.h>
19 #include <linux/netfilter_ipv4/ip_tables.h>
20
21 MODULE_LICENSE("GPL");
22 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
23 MODULE_DESCRIPTION("iptables addrtype match");
24
25 static inline int match_type(u_int32_t addr, u_int16_t mask)
26 {
27 return !!(mask & (1 << inet_addr_type(addr)));
28 }
29
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, int *hotdrop)
33 {
34 const struct ipt_addrtype_info *info = matchinfo;
35 const struct iphdr *iph = skb->nh.iph;
36 int ret = 1;
37
38 if (info->source)
39 ret &= match_type(iph->saddr, info->source)^info->invert_source;
40 if (info->dest)
41 ret &= match_type(iph->daddr, info->dest)^info->invert_dest;
42
43 return ret;
44 }
45
46 static int checkentry(const char *tablename, const struct ipt_ip *ip,
47 void *matchinfo, unsigned int matchsize,
48 unsigned int hook_mask)
49 {
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)));
53 return 0;
54 }
55
56 return 1;
57 }
58
59 static struct ipt_match addrtype_match = {
60 .name = "addrtype",
61 .match = match,
62 .checkentry = checkentry,
63 .me = THIS_MODULE
64 };
65
66 static int __init init(void)
67 {
68 return ipt_register_match(&addrtype_match);
69 }
70
71 static void __exit fini(void)
72 {
73 ipt_unregister_match(&addrtype_match);
74 }
75
76 module_init(init);
77 module_exit(fini);
78
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