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> | |
20 | ||
21 | MODULE_LICENSE("GPL"); | |
22 | MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>"); | |
23 | MODULE_DESCRIPTION("ip6tables security table, for MAC rules"); | |
24 | ||
25 | #define SECURITY_VALID_HOOKS (1 << NF_INET_LOCAL_IN) | \ | |
26 | (1 << NF_INET_FORWARD) | \ | |
27 | (1 << NF_INET_LOCAL_OUT) | |
28 | ||
35aad0ff | 29 | static const struct |
17e6e59f JM |
30 | { |
31 | struct ip6t_replace repl; | |
32 | struct ip6t_standard entries[3]; | |
33 | struct ip6t_error term; | |
f858b486 | 34 | } initial_table __net_initdata = { |
17e6e59f JM |
35 | .repl = { |
36 | .name = "security", | |
37 | .valid_hooks = SECURITY_VALID_HOOKS, | |
38 | .num_entries = 4, | |
39 | .size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error), | |
40 | .hook_entry = { | |
41 | [NF_INET_LOCAL_IN] = 0, | |
42 | [NF_INET_FORWARD] = sizeof(struct ip6t_standard), | |
43 | [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2, | |
44 | }, | |
45 | .underflow = { | |
46 | [NF_INET_LOCAL_IN] = 0, | |
47 | [NF_INET_FORWARD] = sizeof(struct ip6t_standard), | |
48 | [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard) * 2, | |
49 | }, | |
50 | }, | |
51 | .entries = { | |
52 | IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_IN */ | |
53 | IP6T_STANDARD_INIT(NF_ACCEPT), /* FORWARD */ | |
54 | IP6T_STANDARD_INIT(NF_ACCEPT), /* LOCAL_OUT */ | |
55 | }, | |
56 | .term = IP6T_ERROR_INIT, /* ERROR */ | |
57 | }; | |
58 | ||
35aad0ff | 59 | static const struct xt_table security_table = { |
17e6e59f JM |
60 | .name = "security", |
61 | .valid_hooks = SECURITY_VALID_HOOKS, | |
17e6e59f | 62 | .me = THIS_MODULE, |
f88e6a8a | 63 | .af = NFPROTO_IPV6, |
2b95efe7 | 64 | .priority = NF_IP6_PRI_SECURITY, |
17e6e59f JM |
65 | }; |
66 | ||
67 | static unsigned int | |
737535c5 JE |
68 | ip6table_security_hook(unsigned int hook, struct sk_buff *skb, |
69 | const struct net_device *in, | |
70 | const struct net_device *out, | |
71 | int (*okfn)(struct sk_buff *)) | |
17e6e59f | 72 | { |
2b21e051 | 73 | const struct net *net = dev_net((in != NULL) ? in : out); |
17e6e59f | 74 | |
2b21e051 | 75 | return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_security); |
17e6e59f JM |
76 | } |
77 | ||
2b95efe7 | 78 | static struct nf_hook_ops *sectbl_ops __read_mostly; |
17e6e59f JM |
79 | |
80 | static int __net_init ip6table_security_net_init(struct net *net) | |
81 | { | |
82 | net->ipv6.ip6table_security = | |
83 | ip6t_register_table(net, &security_table, &initial_table.repl); | |
84 | ||
85 | if (IS_ERR(net->ipv6.ip6table_security)) | |
86 | return PTR_ERR(net->ipv6.ip6table_security); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | static void __net_exit ip6table_security_net_exit(struct net *net) | |
92 | { | |
f54e9367 | 93 | ip6t_unregister_table(net, net->ipv6.ip6table_security); |
17e6e59f JM |
94 | } |
95 | ||
96 | static struct pernet_operations ip6table_security_net_ops = { | |
97 | .init = ip6table_security_net_init, | |
98 | .exit = ip6table_security_net_exit, | |
99 | }; | |
100 | ||
101 | static int __init ip6table_security_init(void) | |
102 | { | |
103 | int ret; | |
104 | ||
105 | ret = register_pernet_subsys(&ip6table_security_net_ops); | |
106 | if (ret < 0) | |
107 | return ret; | |
108 | ||
2b95efe7 JE |
109 | sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook); |
110 | if (IS_ERR(sectbl_ops)) { | |
111 | ret = PTR_ERR(sectbl_ops); | |
17e6e59f | 112 | goto cleanup_table; |
2b95efe7 | 113 | } |
17e6e59f JM |
114 | |
115 | return ret; | |
116 | ||
117 | cleanup_table: | |
118 | unregister_pernet_subsys(&ip6table_security_net_ops); | |
119 | return ret; | |
120 | } | |
121 | ||
122 | static void __exit ip6table_security_fini(void) | |
123 | { | |
2b95efe7 | 124 | xt_hook_unlink(&security_table, sectbl_ops); |
17e6e59f JM |
125 | unregister_pernet_subsys(&ip6table_security_net_ops); |
126 | } | |
127 | ||
128 | module_init(ip6table_security_init); | |
129 | module_exit(ip6table_security_fini); |