| /* Kernel module to match NFMARK values. */ |
| |
| /* (C) 1999-2001 Marc Boucher <marc@mbsi.ca> |
| * |
| * 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/module.h> |
| #include <linux/skbuff.h> |
| |
| #include <linux/netfilter_ipv4/ipt_mark.h> |
| #include <linux/netfilter_ipv4/ip_tables.h> |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>"); |
| MODULE_DESCRIPTION("iptables mark matching module"); |
| |
| static int |
| match(const struct sk_buff *skb, |
| const struct net_device *in, |
| const struct net_device *out, |
| const void *matchinfo, |
| int offset, |
| int *hotdrop) |
| { |
| const struct ipt_mark_info *info = matchinfo; |
| |
| return ((skb->nfmark & info->mask) == info->mark) ^ info->invert; |
| } |
| |
| static int |
| checkentry(const char *tablename, |
| const struct ipt_ip *ip, |
| void *matchinfo, |
| unsigned int matchsize, |
| unsigned int hook_mask) |
| { |
| if (matchsize != IPT_ALIGN(sizeof(struct ipt_mark_info))) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct ipt_match mark_match = { |
| .name = "mark", |
| .match = &match, |
| .checkentry = &checkentry, |
| .me = THIS_MODULE, |
| }; |
| |
| static int __init init(void) |
| { |
| return ipt_register_match(&mark_match); |
| } |
| |
| static void __exit fini(void) |
| { |
| ipt_unregister_match(&mark_match); |
| } |
| |
| module_init(init); |
| module_exit(fini); |