netfilter: ip6table_mangle: don't reroute in LOCAL_IN
[linux-2.6] / 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         .lock = __RW_LOCK_UNLOCKED(packet_raw.lock),
42         .me = THIS_MODULE,
43         .af = AF_INET6,
44 };
45
46 /* The work comes in here from netfilter.c. */
47 static unsigned int
48 ip6t_hook(unsigned int hook,
49          struct sk_buff *skb,
50          const struct net_device *in,
51          const struct net_device *out,
52          int (*okfn)(struct sk_buff *))
53 {
54         return ip6t_do_table(skb, hook, in, out, init_net.ipv6.ip6table_raw);
55 }
56
57 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
58         {
59           .hook = ip6t_hook,
60           .pf = PF_INET6,
61           .hooknum = NF_INET_PRE_ROUTING,
62           .priority = NF_IP6_PRI_FIRST,
63           .owner = THIS_MODULE,
64         },
65         {
66           .hook = ip6t_hook,
67           .pf = PF_INET6,
68           .hooknum = NF_INET_LOCAL_OUT,
69           .priority = NF_IP6_PRI_FIRST,
70           .owner = THIS_MODULE,
71         },
72 };
73
74 static int __net_init ip6table_raw_net_init(struct net *net)
75 {
76         /* Register table */
77         net->ipv6.ip6table_raw =
78                 ip6t_register_table(net, &packet_raw, &initial_table.repl);
79         if (IS_ERR(net->ipv6.ip6table_raw))
80                 return PTR_ERR(net->ipv6.ip6table_raw);
81         return 0;
82 }
83
84 static void __net_exit ip6table_raw_net_exit(struct net *net)
85 {
86         ip6t_unregister_table(net->ipv6.ip6table_raw);
87 }
88
89 static struct pernet_operations ip6table_raw_net_ops = {
90         .init = ip6table_raw_net_init,
91         .exit = ip6table_raw_net_exit,
92 };
93
94 static int __init ip6table_raw_init(void)
95 {
96         int ret;
97
98         ret = register_pernet_subsys(&ip6table_raw_net_ops);
99         if (ret < 0)
100                 return ret;
101
102         /* Register hooks */
103         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
104         if (ret < 0)
105                 goto cleanup_table;
106
107         return ret;
108
109  cleanup_table:
110         unregister_pernet_subsys(&ip6table_raw_net_ops);
111         return ret;
112 }
113
114 static void __exit ip6table_raw_fini(void)
115 {
116         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
117         unregister_pernet_subsys(&ip6table_raw_net_ops);
118 }
119
120 module_init(ip6table_raw_init);
121 module_exit(ip6table_raw_fini);
122 MODULE_LICENSE("GPL");