Linux Kernel  3.7.1
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ip6table_raw.c
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1 /*
2  * IPv6 raw table, a port of the IPv4 raw table to IPv6
3  *
4  * Copyright (C) 2003 Jozsef Kadlecsik <[email protected]>
5  */
6 #include <linux/module.h>
7 #include <linux/netfilter_ipv6/ip6_tables.h>
8 #include <linux/slab.h>
9 
10 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
11 
12 static const struct xt_table packet_raw = {
13  .name = "raw",
14  .valid_hooks = RAW_VALID_HOOKS,
15  .me = THIS_MODULE,
16  .af = NFPROTO_IPV6,
17  .priority = NF_IP6_PRI_RAW,
18 };
19 
20 /* The work comes in here from netfilter.c. */
21 static unsigned int
22 ip6table_raw_hook(unsigned int hook, struct sk_buff *skb,
23  const struct net_device *in, const struct net_device *out,
24  int (*okfn)(struct sk_buff *))
25 {
26  const struct net *net = dev_net((in != NULL) ? in : out);
27 
28  return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_raw);
29 }
30 
31 static struct nf_hook_ops *rawtable_ops __read_mostly;
32 
33 static int __net_init ip6table_raw_net_init(struct net *net)
34 {
35  struct ip6t_replace *repl;
36 
37  repl = ip6t_alloc_initial_table(&packet_raw);
38  if (repl == NULL)
39  return -ENOMEM;
40  net->ipv6.ip6table_raw =
41  ip6t_register_table(net, &packet_raw, repl);
42  kfree(repl);
43  return PTR_RET(net->ipv6.ip6table_raw);
44 }
45 
46 static void __net_exit ip6table_raw_net_exit(struct net *net)
47 {
48  ip6t_unregister_table(net, net->ipv6.ip6table_raw);
49 }
50 
51 static struct pernet_operations ip6table_raw_net_ops = {
52  .init = ip6table_raw_net_init,
53  .exit = ip6table_raw_net_exit,
54 };
55 
56 static int __init ip6table_raw_init(void)
57 {
58  int ret;
59 
60  ret = register_pernet_subsys(&ip6table_raw_net_ops);
61  if (ret < 0)
62  return ret;
63 
64  /* Register hooks */
65  rawtable_ops = xt_hook_link(&packet_raw, ip6table_raw_hook);
66  if (IS_ERR(rawtable_ops)) {
67  ret = PTR_ERR(rawtable_ops);
68  goto cleanup_table;
69  }
70 
71  return ret;
72 
73  cleanup_table:
74  unregister_pernet_subsys(&ip6table_raw_net_ops);
75  return ret;
76 }
77 
78 static void __exit ip6table_raw_fini(void)
79 {
80  xt_hook_unlink(&packet_raw, rawtable_ops);
81  unregister_pernet_subsys(&ip6table_raw_net_ops);
82 }
83 
84 module_init(ip6table_raw_init);
85 module_exit(ip6table_raw_fini);
86 MODULE_LICENSE("GPL");