Commit | Line | Data |
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17e6e59f JM |
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> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
17e6e59f JM |
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 | ||
b9e69e12 FW |
30 | static int __net_init ip6table_security_table_init(struct net *net); |
31 | ||
35aad0ff | 32 | static const struct xt_table security_table = { |
17e6e59f JM |
33 | .name = "security", |
34 | .valid_hooks = SECURITY_VALID_HOOKS, | |
17e6e59f | 35 | .me = THIS_MODULE, |
f88e6a8a | 36 | .af = NFPROTO_IPV6, |
2b95efe7 | 37 | .priority = NF_IP6_PRI_SECURITY, |
b9e69e12 | 38 | .table_init = ip6table_security_table_init, |
17e6e59f JM |
39 | }; |
40 | ||
41 | static unsigned int | |
06198b34 | 42 | ip6table_security_hook(void *priv, struct sk_buff *skb, |
238e54c9 | 43 | const struct nf_hook_state *state) |
17e6e59f | 44 | { |
6cb8ff3f | 45 | return ip6t_do_table(skb, state, state->net->ipv6.ip6table_security); |
17e6e59f JM |
46 | } |
47 | ||
2b95efe7 | 48 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
17e6e59f | 49 | |
b9e69e12 | 50 | static int __net_init ip6table_security_table_init(struct net *net) |
17e6e59f | 51 | { |
e3eaa991 | 52 | struct ip6t_replace *repl; |
a67dd266 | 53 | int ret; |
17e6e59f | 54 | |
b9e69e12 FW |
55 | if (net->ipv6.ip6table_security) |
56 | return 0; | |
57 | ||
e3eaa991 JE |
58 | repl = ip6t_alloc_initial_table(&security_table); |
59 | if (repl == NULL) | |
60 | return -ENOMEM; | |
a67dd266 FW |
61 | ret = ip6t_register_table(net, &security_table, repl, sectbl_ops, |
62 | &net->ipv6.ip6table_security); | |
e3eaa991 | 63 | kfree(repl); |
a67dd266 | 64 | return ret; |
17e6e59f JM |
65 | } |
66 | ||
67 | static void __net_exit ip6table_security_net_exit(struct net *net) | |
68 | { | |
b9e69e12 FW |
69 | if (!net->ipv6.ip6table_security) |
70 | return; | |
a67dd266 | 71 | ip6t_unregister_table(net, net->ipv6.ip6table_security, sectbl_ops); |
b9e69e12 | 72 | net->ipv6.ip6table_security = NULL; |
17e6e59f JM |
73 | } |
74 | ||
75 | static struct pernet_operations ip6table_security_net_ops = { | |
17e6e59f JM |
76 | .exit = ip6table_security_net_exit, |
77 | }; | |
78 | ||
79 | static int __init ip6table_security_init(void) | |
80 | { | |
81 | int ret; | |
82 | ||
b9e69e12 FW |
83 | sectbl_ops = xt_hook_ops_alloc(&security_table, ip6table_security_hook); |
84 | if (IS_ERR(sectbl_ops)) | |
85 | return PTR_ERR(sectbl_ops); | |
86 | ||
17e6e59f | 87 | ret = register_pernet_subsys(&ip6table_security_net_ops); |
b9e69e12 FW |
88 | if (ret < 0) { |
89 | kfree(sectbl_ops); | |
17e6e59f | 90 | return ret; |
2b95efe7 | 91 | } |
17e6e59f | 92 | |
b9e69e12 FW |
93 | ret = ip6table_security_table_init(&init_net); |
94 | if (ret) { | |
95 | unregister_pernet_subsys(&ip6table_security_net_ops); | |
96 | kfree(sectbl_ops); | |
97 | } | |
17e6e59f JM |
98 | return ret; |
99 | } | |
100 | ||
101 | static void __exit ip6table_security_fini(void) | |
102 | { | |
17e6e59f | 103 | unregister_pernet_subsys(&ip6table_security_net_ops); |
b9e69e12 | 104 | kfree(sectbl_ops); |
17e6e59f JM |
105 | } |
106 | ||
107 | module_init(ip6table_security_init); | |
108 | module_exit(ip6table_security_fini); |