ec12540ae8aea2ee58bdcad6b6bb92a16c6c2d51
[linux-2.6.git] / net / ipv6 / netfilter / ip6table_raw.c
1 /*
2  * IPv6 raw table, a port of the IPv4 raw table to IPv6
3  *
4  * Copyright (C) 2003 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
5  */
6 #include <linux/module.h>
7 #include <linux/netfilter_ipv6/ip6_tables.h>
8
9 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
10
11 static struct
12 {
13         struct ip6t_replace repl;
14         struct ip6t_standard entries[2];
15         struct ip6t_error term;
16 } initial_table __net_initdata = {
17         .repl = {
18                 .name = "raw",
19                 .valid_hooks = RAW_VALID_HOOKS,
20                 .num_entries = 3,
21                 .size = sizeof(struct ip6t_standard) * 2 + sizeof(struct ip6t_error),
22                 .hook_entry = {
23                         [NF_INET_PRE_ROUTING] = 0,
24                         [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard)
25                 },
26                 .underflow = {
27                         [NF_INET_PRE_ROUTING] = 0,
28                         [NF_INET_LOCAL_OUT] = sizeof(struct ip6t_standard)
29                 },
30         },
31         .entries = {
32                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* PRE_ROUTING */
33                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_OUT */
34         },
35         .term = IP6T_ERROR_INIT,                /* ERROR */
36 };
37
38 static struct xt_table packet_raw = {
39         .name = "raw",
40         .valid_hooks = RAW_VALID_HOOKS,
41         .me = THIS_MODULE,
42         .af = AF_INET6,
43 };
44
45 /* The work comes in here from netfilter.c. */
46 static unsigned int
47 ip6t_pre_routing_hook(unsigned int hook,
48          struct sk_buff *skb,
49          const struct net_device *in,
50          const struct net_device *out,
51          int (*okfn)(struct sk_buff *))
52 {
53         return ip6t_do_table(skb, hook, in, out,
54                              dev_net(in)->ipv6.ip6table_raw);
55 }
56
57 static unsigned int
58 ip6t_local_out_hook(unsigned int hook,
59          struct sk_buff *skb,
60          const struct net_device *in,
61          const struct net_device *out,
62          int (*okfn)(struct sk_buff *))
63 {
64         return ip6t_do_table(skb, hook, in, out,
65                              dev_net(out)->ipv6.ip6table_raw);
66 }
67
68 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
69         {
70           .hook = ip6t_pre_routing_hook,
71           .pf = NFPROTO_IPV6,
72           .hooknum = NF_INET_PRE_ROUTING,
73           .priority = NF_IP6_PRI_FIRST,
74           .owner = THIS_MODULE,
75         },
76         {
77           .hook = ip6t_local_out_hook,
78           .pf = NFPROTO_IPV6,
79           .hooknum = NF_INET_LOCAL_OUT,
80           .priority = NF_IP6_PRI_FIRST,
81           .owner = THIS_MODULE,
82         },
83 };
84
85 static int __net_init ip6table_raw_net_init(struct net *net)
86 {
87         /* Register table */
88         net->ipv6.ip6table_raw =
89                 ip6t_register_table(net, &packet_raw, &initial_table.repl);
90         if (IS_ERR(net->ipv6.ip6table_raw))
91                 return PTR_ERR(net->ipv6.ip6table_raw);
92         return 0;
93 }
94
95 static void __net_exit ip6table_raw_net_exit(struct net *net)
96 {
97         ip6t_unregister_table(net->ipv6.ip6table_raw);
98 }
99
100 static struct pernet_operations ip6table_raw_net_ops = {
101         .init = ip6table_raw_net_init,
102         .exit = ip6table_raw_net_exit,
103 };
104
105 static int __init ip6table_raw_init(void)
106 {
107         int ret;
108
109         ret = register_pernet_subsys(&ip6table_raw_net_ops);
110         if (ret < 0)
111                 return ret;
112
113         /* Register hooks */
114         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
115         if (ret < 0)
116                 goto cleanup_table;
117
118         return ret;
119
120  cleanup_table:
121         unregister_pernet_subsys(&ip6table_raw_net_ops);
122         return ret;
123 }
124
125 static void __exit ip6table_raw_fini(void)
126 {
127         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
128         unregister_pernet_subsys(&ip6table_raw_net_ops);
129 }
130
131 module_init(ip6table_raw_init);
132 module_exit(ip6table_raw_fini);
133 MODULE_LICENSE("GPL");