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Commit | Line | Data |
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1da177e4 LT |
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 | ||
fd683222 | 25 | static inline int match_type(__be32 addr, u_int16_t mask) |
1da177e4 LT |
26 | { |
27 | return !!(mask & (1 << inet_addr_type(addr))); | |
28 | } | |
29 | ||
c4986734 PM |
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, | |
2e4e6a17 | 33 | int offset, unsigned int protoff, int *hotdrop) |
1da177e4 LT |
34 | { |
35 | const struct ipt_addrtype_info *info = matchinfo; | |
36 | const struct iphdr *iph = skb->nh.iph; | |
37 | int ret = 1; | |
38 | ||
39 | if (info->source) | |
40 | ret &= match_type(iph->saddr, info->source)^info->invert_source; | |
41 | if (info->dest) | |
42 | ret &= match_type(iph->daddr, info->dest)^info->invert_dest; | |
43 | ||
44 | return ret; | |
45 | } | |
46 | ||
1da177e4 LT |
47 | static struct ipt_match addrtype_match = { |
48 | .name = "addrtype", | |
49 | .match = match, | |
1d5cd909 | 50 | .matchsize = sizeof(struct ipt_addrtype_info), |
1da177e4 LT |
51 | .me = THIS_MODULE |
52 | }; | |
53 | ||
65b4b4e8 | 54 | static int __init ipt_addrtype_init(void) |
1da177e4 LT |
55 | { |
56 | return ipt_register_match(&addrtype_match); | |
57 | } | |
58 | ||
65b4b4e8 | 59 | static void __exit ipt_addrtype_fini(void) |
1da177e4 LT |
60 | { |
61 | ipt_unregister_match(&addrtype_match); | |
62 | } | |
63 | ||
65b4b4e8 AM |
64 | module_init(ipt_addrtype_init); |
65 | module_exit(ipt_addrtype_fini); |