/* * Copyright (c) 2011 Patrick McHardy <kaber@trash.net> * * 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/netdevice.h> #include <linux/netfilter/xt_devgroup.h>#include <linux/netfilter/x_tables.h> MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");MODULE_LICENSE("GPL");MODULE_DESCRIPTION("Xtables: Device group match");MODULE_ALIAS("ipt_devgroup");MODULE_ALIAS("ip6t_devgroup"); static bool devgroup_mt(const struct sk_buff *skb, struct xt_action_param *par){	const struct xt_devgroup_info *info = par->matchinfo; 	if (info->flags & XT_DEVGROUP_MATCH_SRC &&	    (((info->src_group ^ xt_in(par)->group) & info->src_mask ? 1 : 0) ^	     ((info->flags & XT_DEVGROUP_INVERT_SRC) ? 1 : 0)))		return false; 	if (info->flags & XT_DEVGROUP_MATCH_DST &&	    (((info->dst_group ^ xt_out(par)->group) & info->dst_mask ? 1 : 0) ^	     ((info->flags & XT_DEVGROUP_INVERT_DST) ? 1 : 0)))		return false; 	return true;} static int devgroup_mt_checkentry(const struct xt_mtchk_param *par){	const struct xt_devgroup_info *info = par->matchinfo; 	if (info->flags & ~(XT_DEVGROUP_MATCH_SRC | XT_DEVGROUP_INVERT_SRC |			    XT_DEVGROUP_MATCH_DST | XT_DEVGROUP_INVERT_DST))		return -EINVAL; 	if (info->flags & XT_DEVGROUP_MATCH_SRC &&	    par->hook_mask & ~((1 << NF_INET_PRE_ROUTING) |			       (1 << NF_INET_LOCAL_IN) |			       (1 << NF_INET_FORWARD)))		return -EINVAL; 	if (info->flags & XT_DEVGROUP_MATCH_DST &&	    par->hook_mask & ~((1 << NF_INET_FORWARD) |			       (1 << NF_INET_LOCAL_OUT) |			       (1 << NF_INET_POST_ROUTING)))		return -EINVAL; 	return 0;} static struct xt_match devgroup_mt_reg __read_mostly = {	.name		= "devgroup",	.match		= devgroup_mt,	.checkentry	= devgroup_mt_checkentry,	.matchsize	= sizeof(struct xt_devgroup_info),	.family		= NFPROTO_UNSPEC,	.me		= THIS_MODULE}; static int __init devgroup_mt_init(void){	return xt_register_match(&devgroup_mt_reg);} static void __exit devgroup_mt_exit(void){	xt_unregister_match(&devgroup_mt_reg);} module_init(devgroup_mt_init);module_exit(devgroup_mt_exit);