| /* Kernel module to match TOS values. */ |
| |
| /* (C) 1999-2001 Paul `Rusty' Russell |
| * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/ip.h> |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| |
| #include <linux/netfilter_ipv4/ipt_tos.h> |
| #include <linux/netfilter/x_tables.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("iptables TOS match module"); |
| |
| static bool |
| match(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const struct xt_match *match, |
| const void *matchinfo, |
| int offset, |
| unsigned int protoff, |
| bool *hotdrop) |
| { |
| const struct ipt_tos_info *info = matchinfo; |
| |
| return (ip_hdr(skb)->tos == info->tos) ^ info->invert; |
| } |
| |
| static struct xt_match tos_match __read_mostly = { |
| .name = "tos", |
| .family = AF_INET, |
| .match = match, |
| .matchsize = sizeof(struct ipt_tos_info), |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init ipt_multiport_init(void) |
| { |
| return xt_register_match(&tos_match); |
| } |
| |
| static void __exit ipt_multiport_fini(void) |
| { |
| xt_unregister_match(&tos_match); |
| } |
| |
| module_init(ipt_multiport_init); |
| module_exit(ipt_multiport_fini); |