1 /*
2 * "security" table for IPv6
3 *
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
6 * to DAC.
7 *
8 * Based on iptable_mangle.c
9 *
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>
13 *
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.
17 */
18 #include <linux/module.h>
19 #include <linux/netfilter_ipv6/ip6_tables.h>
20 #include <linux/slab.h>
21
22 MODULE_LICENSE("GPL");
23 MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
24 MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
25
26 #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \
27 (1 << NF_INET_FORWARD) | \
28 (1 << NF_INET_LOCAL_OUT)
29
30 static const struct xt_table security_table = {
31 .name = "security",
32 .valid_hooks = SECURITY_VALID_HOOKS,
33 .me = THIS_MODULE,
34 .af = NFPROTO_IPV6,
35 .priority = NF_IP6_PRI_SECURITY,
36 };
37
38 static unsigned int
ip6table_security_hook(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)39 ip6table_security_hook(void *priv, struct sk_buff *skb,
40 const struct nf_hook_state *state)
41 {
42 return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security);
43 }
44
45 static struct nf_hook_ops *sectbl_ops __read_mostly;
46
ip6table_security_net_init(struct net * net)47 static int __net_init ip6table_security_net_init(struct net *net)
48 {
49 struct ip6t_replace *repl;
50
51 repl = ip6t_alloc_initial_table(&security_table);
52 if (repl == NULL)
53 return -ENOMEM;
54 net->ipv6.ip6table_security =
55 ip6t_register_table(net, &security_table, repl);
56 kfree(repl);
57 return PTR_ERR_OR_ZERO(net->ipv6.ip6table_security);
58 }
59
ip6table_security_net_exit(struct net * net)60 static void __net_exit ip6table_security_net_exit(struct net *net)
61 {
62 ip6t_unregister_table(net, net->ipv6.ip6table_security);
63 }
64
65 static struct pernet_operations ip6table_security_net_ops = {
66 .init = ip6table_security_net_init,
67 .exit = ip6table_security_net_exit,
68 };
69
ip6table_security_init(void)70 static int __init ip6table_security_init(void)
71 {
72 int ret;
73
74 ret = register_pernet_subsys(&ip6table_security_net_ops);
75 if (ret < 0)
76 return ret;
77
78 sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook);
79 if (IS_ERR(sectbl_ops)) {
80 ret = PTR_ERR(sectbl_ops);
81 goto cleanup_table;
82 }
83
84 return ret;
85
86 cleanup_table:
87 unregister_pernet_subsys(&ip6table_security_net_ops);
88 return ret;
89 }
90
ip6table_security_fini(void)91 static void __exit ip6table_security_fini(void)
92 {
93 xt_hook_unlink(&security_table, sectbl_ops);
94 unregister_pernet_subsys(&ip6table_security_net_ops);
95 }
96
97 module_init(ip6table_security_init);
98 module_exit(ip6table_security_fini);
99