projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | ||
| 6709dbbb | 11 | #include <linux/ipv6.h> |
| 1da177e4 LT |
12 | #include <linux/module.h> |
| 13 | #include <linux/skbuff.h> | |
| 14 | ||
| 15 | #include <linux/netfilter_ipv6/ip6t_hl.h> | |
| 6709dbbb | 16 | #include <linux/netfilter/x_tables.h> |
| 1da177e4 LT |
17 | |
| 18 | MODULE_AUTHOR("Maciej Soltysiak <solt@dns.toxicfilms.tv>"); | |
| 2ae15b64 | 19 | MODULE_DESCRIPTION("Xtables: IPv6 Hop Limit field match"); |
| 1da177e4 LT |
20 | MODULE_LICENSE("GPL"); |
| 21 | ||
| f7108a20 | 22 | static bool hl_mt6(const struct sk_buff *skb, const struct xt_match_param *par) |
| 1da177e4 | 23 | { |
| f7108a20 | 24 | const struct ip6t_hl_info *info = par->matchinfo; |
| 0660e03f | 25 | const struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| 1da177e4 LT |
26 | |
| 27 | switch (info->mode) { | |
| 28 | case IP6T_HL_EQ: | |
| 7c4e36bc | 29 | return ip6h->hop_limit == info->hop_limit; |
| 1da177e4 LT |
30 | break; |
| 31 | case IP6T_HL_NE: | |
| 7c4e36bc | 32 | return ip6h->hop_limit != info->hop_limit; |
| 1da177e4 LT |
33 | break; |
| 34 | case IP6T_HL_LT: | |
| 7c4e36bc | 35 | return ip6h->hop_limit < info->hop_limit; |
| 1da177e4 LT |
36 | break; |
| 37 | case IP6T_HL_GT: | |
| 7c4e36bc | 38 | return ip6h->hop_limit > info->hop_limit; |
| 1da177e4 LT |
39 | break; |
| 40 | default: | |
| 1ab1457c | 41 | printk(KERN_WARNING "ip6t_hl: unknown mode %d\n", |
| 1da177e4 | 42 | info->mode); |
| 1d93a9cb | 43 | return false; |
| 1da177e4 LT |
44 | } |
| 45 | ||
| 1d93a9cb | 46 | return false; |
| 1da177e4 LT |
47 | } |
| 48 | ||
| d3c5ee6d | 49 | static struct xt_match hl_mt6_reg __read_mostly = { |
| 1da177e4 | 50 | .name = "hl", |
| ee999d8b | 51 | .family = NFPROTO_IPV6, |
| d3c5ee6d | 52 | .match = hl_mt6, |
| 7f939713 | 53 | .matchsize = sizeof(struct ip6t_hl_info), |
| 1da177e4 LT |
54 | .me = THIS_MODULE, |
| 55 | }; | |
| 56 | ||
| d3c5ee6d | 57 | static int __init hl_mt6_init(void) |
| 1da177e4 | 58 | { |
| d3c5ee6d | 59 | return xt_register_match(&hl_mt6_reg); |
| 1da177e4 LT |
60 | } |
| 61 | ||
| d3c5ee6d | 62 | static void __exit hl_mt6_exit(void) |
| 1da177e4 | 63 | { |
| d3c5ee6d | 64 | xt_unregister_match(&hl_mt6_reg); |
| 1da177e4 LT |
65 | } |
| 66 | ||
| d3c5ee6d JE |
67 | module_init(hl_mt6_init); |
| 68 | module_exit(hl_mt6_exit); |