1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * "security" table for IPv6
4  *
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
7  * to DAC.
8  *
9  * Based on iptable_mangle.c
10  *
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>
14  */
15 #include <linux/module.h>
16 #include <linux/netfilter_ipv6/ip6_tables.h>
17 #include <linux/slab.h>
18 
19 MODULE_LICENSE("GPL");
20 MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
21 MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
22 
23 #define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
24 				(1 << NF_INET_FORWARD) | \
25 				(1 << NF_INET_LOCAL_OUT)
26 
27 static const struct xt_table security_table = {
28 	.name		= "security",
29 	.valid_hooks	= SECURITY_VALID_HOOKS,
30 	.me		= THIS_MODULE,
31 	.af		= NFPROTO_IPV6,
32 	.priority	= NF_IP6_PRI_SECURITY,
33 };
34 
35 static struct nf_hook_ops *sectbl_ops __read_mostly;
36 
37 static int ip6table_security_table_init(struct net *net)
38 {
39 	struct ip6t_replace *repl;
40 	int ret;
41 
42 	repl = ip6t_alloc_initial_table(&security_table);
43 	if (repl == NULL)
44 		return -ENOMEM;
45 	ret = ip6t_register_table(net, &security_table, repl, sectbl_ops);
46 	kfree(repl);
47 	return ret;
48 }
49 
50 static void __net_exit ip6table_security_net_pre_exit(struct net *net)
51 {
52 	ip6t_unregister_table_pre_exit(net, "security");
53 }
54 
55 static void __net_exit ip6table_security_net_exit(struct net *net)
56 {
57 	ip6t_unregister_table_exit(net, "security");
58 }
59 
60 static struct pernet_operations ip6table_security_net_ops = {
61 	.pre_exit = ip6table_security_net_pre_exit,
62 	.exit = ip6table_security_net_exit,
63 };
64 
65 static int __init ip6table_security_init(void)
66 {
67 	int ret = xt_register_template(&security_table,
68 				       ip6table_security_table_init);
69 
70 	if (ret < 0)
71 		return ret;
72 
73 	sectbl_ops = xt_hook_ops_alloc(&security_table, ip6t_do_table);
74 	if (IS_ERR(sectbl_ops)) {
75 		xt_unregister_template(&security_table);
76 		return PTR_ERR(sectbl_ops);
77 	}
78 
79 	ret = register_pernet_subsys(&ip6table_security_net_ops);
80 	if (ret < 0) {
81 		kfree(sectbl_ops);
82 		xt_unregister_template(&security_table);
83 		return ret;
84 	}
85 
86 	return ret;
87 }
88 
89 static void __exit ip6table_security_fini(void)
90 {
91 	unregister_pernet_subsys(&ip6table_security_net_ops);
92 	xt_unregister_template(&security_table);
93 	kfree(sectbl_ops);
94 }
95 
96 module_init(ip6table_security_init);
97 module_exit(ip6table_security_fini);
98