4 * This is for use by Mandatory Access Control (MAC) security models,
5 * which need to be able to manage security policy in separate context
8 * Based on iptable_mangle.c
10 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
11 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
12 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
18 #include <linux/module.h>
19 #include <linux/netfilter_ipv4/ip_tables.h>
20 #include <linux/slab.h>
23 MODULE_LICENSE("GPL");
24 MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
25 MODULE_DESCRIPTION("iptables security table, for MAC rules");
27 #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
28 (1 << NF_INET_FORWARD) | \
29 (1 << NF_INET_LOCAL_OUT)
31 static const struct xt_table security_table = {
33 .valid_hooks = SECURITY_VALID_HOOKS,
36 .priority = NF_IP_PRI_SECURITY,
40 iptable_security_hook(const struct nf_hook_ops *ops, struct sk_buff *skb,
41 const struct nf_hook_state *state)
43 const struct net *net;
45 if (ops->hooknum == NF_INET_LOCAL_OUT &&
46 (skb->len < sizeof(struct iphdr) ||
47 ip_hdrlen(skb) < sizeof(struct iphdr)))
48 /* Somebody is playing with raw sockets. */
51 net = dev_net(state->in ? state->in : state->out);
52 return ipt_do_table(skb, ops->hooknum, state,
53 net->ipv4.iptable_security);
56 static struct nf_hook_ops *sectbl_ops __read_mostly;
58 static int __net_init iptable_security_net_init(struct net *net)
60 struct ipt_replace *repl;
62 repl = ipt_alloc_initial_table(&security_table);
65 net->ipv4.iptable_security =
66 ipt_register_table(net, &security_table, repl);
68 return PTR_ERR_OR_ZERO(net->ipv4.iptable_security);
71 static void __net_exit iptable_security_net_exit(struct net *net)
73 ipt_unregister_table(net, net->ipv4.iptable_security);
76 static struct pernet_operations iptable_security_net_ops = {
77 .init = iptable_security_net_init,
78 .exit = iptable_security_net_exit,
81 static int __init iptable_security_init(void)
85 ret = register_pernet_subsys(&iptable_security_net_ops);
89 sectbl_ops = xt_hook_link(&security_table, iptable_security_hook);
90 if (IS_ERR(sectbl_ops)) {
91 ret = PTR_ERR(sectbl_ops);
98 unregister_pernet_subsys(&iptable_security_net_ops);
102 static void __exit iptable_security_fini(void)
104 xt_hook_unlink(&security_table, sectbl_ops);
105 unregister_pernet_subsys(&iptable_security_net_ops);
108 module_init(iptable_security_init);
109 module_exit(iptable_security_fini);