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 = PF_INET6,
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 = PF_INET6,
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");
134
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