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// SPDX-License-Identifier: GPL-2.0-only
/*
* "security" table
*
* This is for use by Mandatory Access Control (MAC) security models,
* which need to be able to manage security policy in separate context
* to DAC.
*
* Based on iptable_mangle.c
*
* Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
* Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
* Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
*/
#include <linux/module.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/slab.h>
#include <net/ip.h>
MODULE_LICENSE("GPL");
MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
MODULE_DESCRIPTION("iptables security table, for MAC rules");
#define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
(1 << NF_INET_FORWARD) | \
(1 << NF_INET_LOCAL_OUT)
static const struct xt_table security_table = {
.name = "security",
.valid_hooks = SECURITY_VALID_HOOKS,
.me = THIS_MODULE,
.af = NFPROTO_IPV4,
.priority = NF_IP_PRI_SECURITY,
};
static struct nf_hook_ops *sectbl_ops __read_mostly;
static int iptable_security_table_init(struct net *net)
{
struct ipt_replace *repl;
int ret;
repl = ipt_alloc_initial_table(&security_table);
if (repl == NULL)
return -ENOMEM;
ret = ipt_register_table(net, &security_table, repl, sectbl_ops);
kfree(repl);
return ret;
}
static void __net_exit iptable_security_net_pre_exit(struct net *net)
{
ipt_unregister_table_pre_exit(net, "security");
}
static void __net_exit iptable_security_net_exit(struct net *net)
{
ipt_unregister_table_exit(net, "security");
}
static struct pernet_operations iptable_security_net_ops = {
.pre_exit = iptable_security_net_pre_exit,
.exit = iptable_security_net_exit,
};
static int __init iptable_security_init(void)
{
int ret = xt_register_template(&security_table,
iptable_security_table_init);
if (ret < 0)
return ret;
sectbl_ops = xt_hook_ops_alloc(&security_table, ipt_do_table);
if (IS_ERR(sectbl_ops)) {
xt_unregister_template(&security_table);
return PTR_ERR(sectbl_ops);
}
ret = register_pernet_subsys(&iptable_security_net_ops);
if (ret < 0) {
xt_unregister_template(&security_table);
kfree(sectbl_ops);
return ret;
}
return ret;
}
static void __exit iptable_security_fini(void)
{
unregister_pernet_subsys(&iptable_security_net_ops);
kfree(sectbl_ops);
xt_unregister_template(&security_table);
}
module_init(iptable_security_init);
module_exit(iptable_security_fini);
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