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 #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         if (IS_ERR(net->ipv6.ip6table_raw))
  44                 return PTR_ERR(net->ipv6.ip6table_raw);
  45         return 0;
  46 }
  47
  48 static void __net_exit ip6table_raw_net_exit(struct net *net)
  49 {
  50         ip6t_unregister_table(net, net->ipv6.ip6table_raw);
  51 }
  52
  53 static struct pernet_operations ip6table_raw_net_ops = {
  54         .init = ip6table_raw_net_init,
  55         .exit = ip6table_raw_net_exit,
  56 };
  57
  58 static int __init ip6table_raw_init(void)
  59 {
  60         int ret;
  61
  62         ret = register_pernet_subsys(&ip6table_raw_net_ops);
  63         if (ret < 0)
  64                 return ret;
  65
  66         /* Register hooks */
  67         rawtable_ops = xt_hook_link(&packet_raw, ip6table_raw_hook);
  68         if (IS_ERR(rawtable_ops)) {
  69                 ret = PTR_ERR(rawtable_ops);
  70                 goto cleanup_table;
  71         }
  72
  73         return ret;
  74
  75  cleanup_table:
  76         unregister_pernet_subsys(&ip6table_raw_net_ops);
  77         return ret;
  78 }
  79
  80 static void __exit ip6table_raw_fini(void)
  81 {
  82         xt_hook_unlink(&packet_raw, rawtable_ops);
  83         unregister_pernet_subsys(&ip6table_raw_net_ops);
  84 }
  85
  86 module_init(ip6table_raw_init);
  87 module_exit(ip6table_raw_fini);
  88 MODULE_LICENSE("GPL");