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18#include <linux/module.h>
19#include <linux/netfilter_ipv6/ip6_tables.h>
20
21MODULE_LICENSE("GPL");
22MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
23MODULE_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
29static const 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),
53 IP6T_STANDARD_INIT(NF_ACCEPT),
54 IP6T_STANDARD_INIT(NF_ACCEPT),
55 },
56 .term = IP6T_ERROR_INIT,
57};
58
59static const struct xt_table security_table = {
60 .name = "security",
61 .valid_hooks = SECURITY_VALID_HOOKS,
62 .me = THIS_MODULE,
63 .af = NFPROTO_IPV6,
64};
65
66static unsigned int
67ip6t_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
77static unsigned int
78ip6t_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
88static unsigned int
89ip6t_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
96 return ip6t_do_table(skb, hook, in, out,
97 dev_net(out)->ipv6.ip6table_security);
98}
99
100static struct nf_hook_ops ip6t_ops[] __read_mostly = {
101 {
102 .hook = ip6t_local_in_hook,
103 .owner = THIS_MODULE,
104 .pf = NFPROTO_IPV6,
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 = NFPROTO_IPV6,
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 = NFPROTO_IPV6,
119 .hooknum = NF_INET_LOCAL_OUT,
120 .priority = NF_IP6_PRI_SECURITY,
121 },
122};
123
124static 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
135static void __net_exit ip6table_security_net_exit(struct net *net)
136{
137 ip6t_unregister_table(net->ipv6.ip6table_security);
138}
139
140static struct pernet_operations ip6table_security_net_ops = {
141 .init = ip6table_security_net_init,
142 .exit = ip6table_security_net_exit,
143};
144
145static 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
159cleanup_table:
160 unregister_pernet_subsys(&ip6table_security_net_ops);
161 return ret;
162}
163
164static 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
170module_init(ip6table_security_init);
171module_exit(ip6table_security_fini);
172
