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
29 static struct
30 {
31 struct ip6t_replace repl;
32 struct ip6t_standard entries[3];
33 struct ip6t_error term;
34 } initial_table __net_initdata = {
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
59 static struct xt_table security_table = {
60 .name = "security",
61 .valid_hooks = SECURITY_VALID_HOOKS,
62 .me = THIS_MODULE,
63 .af = AF_INET6,
64 };
65
66 static unsigned int
67 ip6t_local_in_hook(unsigned int hook,
68 struct sk_buff *skb,
69 const struct net_device *in,
70 const struct net_device *out,
71 int (*okfn)(struct sk_buff *))
72 {
73 return ip6t_do_table(skb, hook, in, out,
74 dev_net(in)->ipv6.ip6table_security);
75 }
76
77 static unsigned int
78 ip6t_forward_hook(unsigned int hook,
79 struct sk_buff *skb,
80 const struct net_device *in,
81 const struct net_device *out,
82 int (*okfn)(struct sk_buff *))
83 {
84 return ip6t_do_table(skb, hook, in, out,
85 dev_net(in)->ipv6.ip6table_security);
86 }
87
88 static unsigned int
89 ip6t_local_out_hook(unsigned int hook,
90 struct sk_buff *skb,
91 const struct net_device *in,
92 const struct net_device *out,
93 int (*okfn)(struct sk_buff *))
94 {
95 /* TBD: handle short packets via raw socket */
96 return ip6t_do_table(skb, hook, in, out,
97 dev_net(out)->ipv6.ip6table_security);
98 }
99
100 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
101 {
102 .hook = ip6t_local_in_hook,
103 .owner = THIS_MODULE,
104 .pf = PF_INET6,
105 .hooknum = NF_INET_LOCAL_IN,
106 .priority = NF_IP6_PRI_SECURITY,
107 },
108 {
109 .hook = ip6t_forward_hook,
110 .owner = THIS_MODULE,
111 .pf = PF_INET6,
112 .hooknum = NF_INET_FORWARD,
113 .priority = NF_IP6_PRI_SECURITY,
114 },
115 {
116 .hook = ip6t_local_out_hook,
117 .owner = THIS_MODULE,
118 .pf = PF_INET6,
119 .hooknum = NF_INET_LOCAL_OUT,
120 .priority = NF_IP6_PRI_SECURITY,
121 },
122 };
123
124 static int __net_init ip6table_security_net_init(struct net *net)
125 {
126 net->ipv6.ip6table_security =
127 ip6t_register_table(net, &security_table, &initial_table.repl);
128
129 if (IS_ERR(net->ipv6.ip6table_security))
130 return PTR_ERR(net->ipv6.ip6table_security);
131
132 return 0;
133 }
134
135 static void __net_exit ip6table_security_net_exit(struct net *net)
136 {
137 ip6t_unregister_table(net->ipv6.ip6table_security);
138 }
139
140 static struct pernet_operations ip6table_security_net_ops = {
141 .init = ip6table_security_net_init,
142 .exit = ip6table_security_net_exit,
143 };
144
145 static int __init ip6table_security_init(void)
146 {
147 int ret;
148
149 ret = register_pernet_subsys(&ip6table_security_net_ops);
150 if (ret < 0)
151 return ret;
152
153 ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
154 if (ret < 0)
155 goto cleanup_table;
156
157 return ret;
158
159 cleanup_table:
160 unregister_pernet_subsys(&ip6table_security_net_ops);
161 return ret;
162 }
163
164 static void __exit ip6table_security_fini(void)
165 {
166 nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
167 unregister_pernet_subsys(&ip6table_security_net_ops);
168 }
169
170 module_init(ip6table_security_init);
171 module_exit(ip6table_security_fini);
172
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