Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Kernel module to match TOS values. */ |
| 2 | |
| 3 | /* (C) 1999-2001 Paul `Rusty' Russell |
| 4 | * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| 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_ipv4/ipt_tos.h> |
| 15 | #include <linux/netfilter_ipv4/ip_tables.h> |
| 16 | |
| 17 | MODULE_LICENSE("GPL"); |
| 18 | MODULE_DESCRIPTION("iptables TOS match module"); |
| 19 | |
| 20 | static int |
| 21 | match(const struct sk_buff *skb, |
| 22 | const struct net_device *in, |
| 23 | const struct net_device *out, |
| 24 | const void *matchinfo, |
| 25 | int offset, |
| 26 | int *hotdrop) |
| 27 | { |
| 28 | const struct ipt_tos_info *info = matchinfo; |
| 29 | |
| 30 | return (skb->nh.iph->tos == info->tos) ^ info->invert; |
| 31 | } |
| 32 | |
| 33 | static int |
| 34 | checkentry(const char *tablename, |
| 35 | const struct ipt_ip *ip, |
| 36 | void *matchinfo, |
| 37 | unsigned int matchsize, |
| 38 | unsigned int hook_mask) |
| 39 | { |
| 40 | if (matchsize != IPT_ALIGN(sizeof(struct ipt_tos_info))) |
| 41 | return 0; |
| 42 | |
| 43 | return 1; |
| 44 | } |
| 45 | |
| 46 | static struct ipt_match tos_match = { |
| 47 | .name = "tos", |
| 48 | .match = &match, |
| 49 | .checkentry = &checkentry, |
| 50 | .me = THIS_MODULE, |
| 51 | }; |
| 52 | |
| 53 | static int __init init(void) |
| 54 | { |
| 55 | return ipt_register_match(&tos_match); |
| 56 | } |
| 57 | |
| 58 | static void __exit fini(void) |
| 59 | { |
| 60 | ipt_unregister_match(&tos_match); |
| 61 | } |
| 62 | |
| 63 | module_init(init); |
| 64 | module_exit(fini); |