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_pre_routing_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,
55 			     dev_net(in)->ipv6.ip6table_raw);
56 }
57 
58 static unsigned int
59 ip6t_local_out_hook(unsigned int hook,
60 	 struct sk_buff *skb,
61 	 const struct net_device *in,
62 	 const struct net_device *out,
63 	 int (*okfn)(struct sk_buff *))
64 {
65 	return ip6t_do_table(skb, hook, in, out,
66 			     dev_net(out)->ipv6.ip6table_raw);
67 }
68 
69 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
70 	{
71 	  .hook = ip6t_pre_routing_hook,
72 	  .pf = PF_INET6,
73 	  .hooknum = NF_INET_PRE_ROUTING,
74 	  .priority = NF_IP6_PRI_FIRST,
75 	  .owner = THIS_MODULE,
76 	},
77 	{
78 	  .hook = ip6t_local_out_hook,
79 	  .pf = PF_INET6,
80 	  .hooknum = NF_INET_LOCAL_OUT,
81 	  .priority = NF_IP6_PRI_FIRST,
82 	  .owner = THIS_MODULE,
83 	},
84 };
85 
86 static int __net_init ip6table_raw_net_init(struct net *net)
87 {
88 	/* Register table */
89 	net->ipv6.ip6table_raw =
90 		ip6t_register_table(net, &packet_raw, &initial_table.repl);
91 	if (IS_ERR(net->ipv6.ip6table_raw))
92 		return PTR_ERR(net->ipv6.ip6table_raw);
93 	return 0;
94 }
95 
96 static void __net_exit ip6table_raw_net_exit(struct net *net)
97 {
98 	ip6t_unregister_table(net->ipv6.ip6table_raw);
99 }
100 
101 static struct pernet_operations ip6table_raw_net_ops = {
102 	.init = ip6table_raw_net_init,
103 	.exit = ip6table_raw_net_exit,
104 };
105 
106 static int __init ip6table_raw_init(void)
107 {
108 	int ret;
109 
110 	ret = register_pernet_subsys(&ip6table_raw_net_ops);
111 	if (ret < 0)
112 		return ret;
113 
114 	/* Register hooks */
115 	ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
116 	if (ret < 0)
117 		goto cleanup_table;
118 
119 	return ret;
120 
121  cleanup_table:
122 	unregister_pernet_subsys(&ip6table_raw_net_ops);
123 	return ret;
124 }
125 
126 static void __exit ip6table_raw_fini(void)
127 {
128 	nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
129 	unregister_pernet_subsys(&ip6table_raw_net_ops);
130 }
131 
132 module_init(ip6table_raw_init);
133 module_exit(ip6table_raw_fini);
134 MODULE_LICENSE("GPL");
135