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 unsigned int
ip6table_security_hook(void * priv,struct sk_buff * skb,const struct nf_hook_state * state)36 ip6table_security_hook(void *priv, struct sk_buff *skb,
37 const struct nf_hook_state *state)
38 {
39 return ip6t_do_table(skb, state, priv);
40 }
41
42 static struct nf_hook_ops *sectbl_ops __read_mostly;
43
ip6table_security_table_init(struct net * net)44 static int ip6table_security_table_init(struct net *net)
45 {
46 struct ip6t_replace *repl;
47 int ret;
48
49 repl = ip6t_alloc_initial_table(&security_table);
50 if (repl == NULL)
51 return -ENOMEM;
52 ret = ip6t_register_table(net, &security_table, repl, sectbl_ops);
53 kfree(repl);
54 return ret;
55 }
56
ip6table_security_net_pre_exit(struct net * net)57 static void __net_exit ip6table_security_net_pre_exit(struct net *net)
58 {
59 ip6t_unregister_table_pre_exit(net, "security");
60 }
61
ip6table_security_net_exit(struct net * net)62 static void __net_exit ip6table_security_net_exit(struct net *net)
63 {
64 ip6t_unregister_table_exit(net, "security");
65 }
66
67 static struct pernet_operations ip6table_security_net_ops = {
68 .pre_exit = ip6table_security_net_pre_exit,
69 .exit = ip6table_security_net_exit,
70 };
71
ip6table_security_init(void)72 static int __init ip6table_security_init(void)
73 {
74 int ret = xt_register_template(&security_table,
75 ip6table_security_table_init);
76
77 if (ret < 0)
78 return ret;
79
80 sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook);
81 if (IS_ERR(sectbl_ops)) {
82 xt_unregister_template(&security_table);
83 return PTR_ERR(sectbl_ops);
84 }
85
86 ret = register_pernet_subsys(&ip6table_security_net_ops);
87 if (ret < 0) {
88 kfree(sectbl_ops);
89 xt_unregister_template(&security_table);
90 return ret;
91 }
92
93 return ret;
94 }
95
ip6table_security_fini(void)96 static void __exit ip6table_security_fini(void)
97 {
98 unregister_pernet_subsys(&ip6table_security_net_ops);
99 xt_unregister_template(&security_table);
100 kfree(sectbl_ops);
101 }
102
103 module_init(ip6table_security_init);
104 module_exit(ip6table_security_fini);
105