[NETFILTER]: Rename init functions.
[deliverable/linux.git] / net / ipv6 / netfilter / ip6t_hl.c
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1/* Hop Limit matching module */
2
3/* (C) 2001-2002 Maciej Soltysiak <solt@dns.toxicfilms.tv>
4 * Based on HW's ttl module
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/module.h>
12#include <linux/skbuff.h>
13
14#include <linux/netfilter_ipv6/ip6t_hl.h>
15#include <linux/netfilter_ipv6/ip6_tables.h>
16
17MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>");
18MODULE_DESCRIPTION("IP tables Hop Limit matching module");
19MODULE_LICENSE("GPL");
20
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21static int match(const struct sk_buff *skb,
22 const struct net_device *in, const struct net_device *out,
23 const struct xt_match *match, const void *matchinfo,
24 int offset, unsigned int protoff, int *hotdrop)
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25{
26 const struct ip6t_hl_info *info = matchinfo;
27 const struct ipv6hdr *ip6h = skb->nh.ipv6h;
28
29 switch (info->mode) {
30 case IP6T_HL_EQ:
31 return (ip6h->hop_limit == info->hop_limit);
32 break;
33 case IP6T_HL_NE:
34 return (!(ip6h->hop_limit == info->hop_limit));
35 break;
36 case IP6T_HL_LT:
37 return (ip6h->hop_limit < info->hop_limit);
38 break;
39 case IP6T_HL_GT:
40 return (ip6h->hop_limit > info->hop_limit);
41 break;
42 default:
43 printk(KERN_WARNING "ip6t_hl: unknown mode %d\n",
44 info->mode);
45 return 0;
46 }
47
48 return 0;
49}
50
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51static struct ip6t_match hl_match = {
52 .name = "hl",
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53 .match = match,
54 .matchsize = sizeof(struct ip6t_hl_info),
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55 .me = THIS_MODULE,
56};
57
65b4b4e8 58static int __init ip6t_hl_init(void)
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59{
60 return ip6t_register_match(&hl_match);
61}
62
65b4b4e8 63static void __exit ip6t_hl_fini(void)
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64{
65 ip6t_unregister_match(&hl_match);
66
67}
68
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69module_init(ip6t_hl_init);
70module_exit(ip6t_hl_fini);
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