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/*
* Xtables module to match the process control group.
*
* Might be used to implement individual "per-application" firewall
* policies in contrast to global policies based on control groups.
* Matching is based upon processes tagged to net_cls' classid marker.
*
* (C) 2013 Daniel Borkmann <dborkman@redhat.com>
*
* 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/skbuff.h>
#include <linux/module.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_cgroup.h>
#include <net/sock.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
MODULE_DESCRIPTION("Xtables: process control group matching");
MODULE_ALIAS("ipt_cgroup");
MODULE_ALIAS("ip6t_cgroup");
static int cgroup_mt_check_v0(const struct xt_mtchk_param *par)
{
struct xt_cgroup_info_v0 *info = par->matchinfo;
if (info->invert & ~1)
return -EINVAL;
return 0;
}
static bool
cgroup_mt_v0(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_cgroup_info_v0 *info = par->matchinfo;
if (skb->sk == NULL || !sk_fullsock(skb->sk))
return false;
return (info->id == sock_cgroup_classid(&skb->sk->sk_cgrp_data)) ^
info->invert;
}
static struct xt_match cgroup_mt_reg[] __read_mostly = {
{
.name = "cgroup",
.revision = 0,
.family = NFPROTO_UNSPEC,
.checkentry = cgroup_mt_check_v0,
.match = cgroup_mt_v0,
.matchsize = sizeof(struct xt_cgroup_info_v0),
.me = THIS_MODULE,
.hooks = (1 << NF_INET_LOCAL_OUT) |
(1 << NF_INET_POST_ROUTING) |
(1 << NF_INET_LOCAL_IN),
},
};
static int __init cgroup_mt_init(void)
{
return xt_register_matches(cgroup_mt_reg, ARRAY_SIZE(cgroup_mt_reg));
}
static void __exit cgroup_mt_exit(void)
{
xt_unregister_matches(cgroup_mt_reg, ARRAY_SIZE(cgroup_mt_reg));
}
module_init(cgroup_mt_init);
module_exit(cgroup_mt_exit);
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