Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * iptables module to match IP address ranges | |
3 | * | |
4 | * (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> | |
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 | #include <linux/module.h> | |
11 | #include <linux/skbuff.h> | |
12 | #include <linux/ip.h> | |
6709dbbb | 13 | #include <linux/netfilter/x_tables.h> |
1da177e4 LT |
14 | #include <linux/netfilter_ipv4/ipt_iprange.h> |
15 | ||
16 | MODULE_LICENSE("GPL"); | |
17 | MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>"); | |
18 | MODULE_DESCRIPTION("iptables arbitrary IP range match module"); | |
19 | ||
20 | #if 0 | |
21 | #define DEBUGP printk | |
22 | #else | |
23 | #define DEBUGP(format, args...) | |
24 | #endif | |
25 | ||
26 | static int | |
27 | match(const struct sk_buff *skb, | |
28 | const struct net_device *in, | |
29 | const struct net_device *out, | |
c4986734 | 30 | const struct xt_match *match, |
1da177e4 | 31 | const void *matchinfo, |
2e4e6a17 | 32 | int offset, unsigned int protoff, int *hotdrop) |
1da177e4 LT |
33 | { |
34 | const struct ipt_iprange_info *info = matchinfo; | |
35 | const struct iphdr *iph = skb->nh.iph; | |
36 | ||
37 | if (info->flags & IPRANGE_SRC) { | |
38 | if (((ntohl(iph->saddr) < ntohl(info->src.min_ip)) | |
39 | || (ntohl(iph->saddr) > ntohl(info->src.max_ip))) | |
40 | ^ !!(info->flags & IPRANGE_SRC_INV)) { | |
41 | DEBUGP("src IP %u.%u.%u.%u NOT in range %s" | |
42 | "%u.%u.%u.%u-%u.%u.%u.%u\n", | |
43 | NIPQUAD(iph->saddr), | |
e905a9ed | 44 | info->flags & IPRANGE_SRC_INV ? "(INV) " : "", |
1da177e4 LT |
45 | NIPQUAD(info->src.min_ip), |
46 | NIPQUAD(info->src.max_ip)); | |
47 | return 0; | |
48 | } | |
49 | } | |
50 | if (info->flags & IPRANGE_DST) { | |
51 | if (((ntohl(iph->daddr) < ntohl(info->dst.min_ip)) | |
52 | || (ntohl(iph->daddr) > ntohl(info->dst.max_ip))) | |
53 | ^ !!(info->flags & IPRANGE_DST_INV)) { | |
54 | DEBUGP("dst IP %u.%u.%u.%u NOT in range %s" | |
55 | "%u.%u.%u.%u-%u.%u.%u.%u\n", | |
56 | NIPQUAD(iph->daddr), | |
e905a9ed | 57 | info->flags & IPRANGE_DST_INV ? "(INV) " : "", |
1da177e4 LT |
58 | NIPQUAD(info->dst.min_ip), |
59 | NIPQUAD(info->dst.max_ip)); | |
60 | return 0; | |
61 | } | |
62 | } | |
63 | return 1; | |
64 | } | |
65 | ||
6709dbbb | 66 | static struct xt_match iprange_match = { |
1d5cd909 | 67 | .name = "iprange", |
6709dbbb | 68 | .family = AF_INET, |
1d5cd909 PM |
69 | .match = match, |
70 | .matchsize = sizeof(struct ipt_iprange_info), | |
1d5cd909 | 71 | .me = THIS_MODULE |
1da177e4 LT |
72 | }; |
73 | ||
65b4b4e8 | 74 | static int __init ipt_iprange_init(void) |
1da177e4 | 75 | { |
6709dbbb | 76 | return xt_register_match(&iprange_match); |
1da177e4 LT |
77 | } |
78 | ||
65b4b4e8 | 79 | static void __exit ipt_iprange_fini(void) |
1da177e4 | 80 | { |
6709dbbb | 81 | xt_unregister_match(&iprange_match); |
1da177e4 LT |
82 | } |
83 | ||
65b4b4e8 AM |
84 | module_init(ipt_iprange_init); |
85 | module_exit(ipt_iprange_fini); |