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1da177e4 LT |
1 | /* IP tables module for matching the routing realm |
2 | * | |
3 | * $Id: ipt_realm.c,v 1.3 2004/03/05 13:25:40 laforge Exp $ | |
4 | * | |
5 | * (C) 2003 by Sampsa Ranta <sampsa@netsonic.fi> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/skbuff.h> | |
14 | #include <linux/netdevice.h> | |
15 | #include <net/route.h> | |
16 | ||
2e4e6a17 HW |
17 | #include <linux/netfilter_ipv4.h> |
18 | #include <linux/netfilter/xt_realm.h> | |
19 | #include <linux/netfilter/x_tables.h> | |
1da177e4 LT |
20 | |
21 | MODULE_AUTHOR("Sampsa Ranta <sampsa@netsonic.fi>"); | |
22 | MODULE_LICENSE("GPL"); | |
2e4e6a17 HW |
23 | MODULE_DESCRIPTION("X_tables realm match"); |
24 | MODULE_ALIAS("ipt_realm"); | |
1da177e4 LT |
25 | |
26 | static int | |
27 | match(const struct sk_buff *skb, | |
28 | const struct net_device *in, | |
29 | const struct net_device *out, | |
30 | const void *matchinfo, | |
31 | int offset, | |
2e4e6a17 | 32 | unsigned int protoff, |
1da177e4 LT |
33 | int *hotdrop) |
34 | { | |
2e4e6a17 | 35 | const struct xt_realm_info *info = matchinfo; |
1da177e4 LT |
36 | struct dst_entry *dst = skb->dst; |
37 | ||
38 | return (info->id == (dst->tclassid & info->mask)) ^ info->invert; | |
39 | } | |
40 | ||
41 | static int check(const char *tablename, | |
2e4e6a17 | 42 | const void *ip, |
1da177e4 LT |
43 | void *matchinfo, |
44 | unsigned int matchsize, | |
45 | unsigned int hook_mask) | |
46 | { | |
47 | if (hook_mask | |
48 | & ~((1 << NF_IP_POST_ROUTING) | (1 << NF_IP_FORWARD) | | |
49 | (1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_LOCAL_IN))) { | |
2e4e6a17 | 50 | printk("xt_realm: only valid for POST_ROUTING, LOCAL_OUT, " |
1da177e4 LT |
51 | "LOCAL_IN or FORWARD.\n"); |
52 | return 0; | |
53 | } | |
2e4e6a17 HW |
54 | if (matchsize != XT_ALIGN(sizeof(struct xt_realm_info))) { |
55 | printk("xt_realm: invalid matchsize.\n"); | |
1da177e4 LT |
56 | return 0; |
57 | } | |
58 | return 1; | |
59 | } | |
60 | ||
2e4e6a17 | 61 | static struct xt_match realm_match = { |
1da177e4 LT |
62 | .name = "realm", |
63 | .match = match, | |
64 | .checkentry = check, | |
65 | .me = THIS_MODULE | |
66 | }; | |
67 | ||
68 | static int __init init(void) | |
69 | { | |
2e4e6a17 | 70 | return xt_register_match(AF_INET, &realm_match); |
1da177e4 LT |
71 | } |
72 | ||
73 | static void __exit fini(void) | |
74 | { | |
2e4e6a17 | 75 | xt_unregister_match(AF_INET, &realm_match); |
1da177e4 LT |
76 | } |
77 | ||
78 | module_init(init); | |
79 | module_exit(fini); |