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net/netfilter/xt_devgroup.c
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/*
* 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);
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