1 // SPDX-License-Identifier: GPL-2.0-only
5 * This is for use by Mandatory Access Control (MAC) security models,
6 * which need to be able to manage security policy in separate context
9 * Based on iptable_mangle.c
11 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
12 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
13 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
15 #include <linux/module.h>
16 #include <linux/netfilter_ipv4/ip_tables.h>
17 #include <linux/slab.h>
20 MODULE_LICENSE("GPL");
21 MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
22 MODULE_DESCRIPTION("iptables security table, for MAC rules");
24 #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
25 (1 << NF_INET_FORWARD) | \
26 (1 << NF_INET_LOCAL_OUT)
28 static int __net_init iptable_security_table_init(struct net *net);
30 static const struct xt_table security_table = {
32 .valid_hooks = SECURITY_VALID_HOOKS,
35 .priority = NF_IP_PRI_SECURITY,
36 .table_init = iptable_security_table_init,
40 iptable_security_hook(void *priv, struct sk_buff *skb,
41 const struct nf_hook_state *state)
43 return ipt_do_table(skb, state, state->net->ipv4.iptable_security);
46 static struct nf_hook_ops *sectbl_ops __read_mostly;
48 static int __net_init iptable_security_table_init(struct net *net)
50 struct ipt_replace *repl;
53 if (net->ipv4.iptable_security)
56 repl = ipt_alloc_initial_table(&security_table);
59 ret = ipt_register_table(net, &security_table, repl, sectbl_ops,
60 &net->ipv4.iptable_security);
65 static void __net_exit iptable_security_net_pre_exit(struct net *net)
67 if (net->ipv4.iptable_security)
68 ipt_unregister_table_pre_exit(net, net->ipv4.iptable_security,
72 static void __net_exit iptable_security_net_exit(struct net *net)
74 if (!net->ipv4.iptable_security)
76 ipt_unregister_table_exit(net, net->ipv4.iptable_security);
77 net->ipv4.iptable_security = NULL;
80 static struct pernet_operations iptable_security_net_ops = {
81 .pre_exit = iptable_security_net_pre_exit,
82 .exit = iptable_security_net_exit,
85 static int __init iptable_security_init(void)
89 sectbl_ops = xt_hook_ops_alloc(&security_table, iptable_security_hook);
90 if (IS_ERR(sectbl_ops))
91 return PTR_ERR(sectbl_ops);
93 ret = register_pernet_subsys(&iptable_security_net_ops);
99 ret = iptable_security_table_init(&init_net);
101 unregister_pernet_subsys(&iptable_security_net_ops);
108 static void __exit iptable_security_fini(void)
110 unregister_pernet_subsys(&iptable_security_net_ops);
114 module_init(iptable_security_init);
115 module_exit(iptable_security_fini);