kernel/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(const struct nf_hook_ops *ops, struct sk_buff *skb,
  23                   const struct nf_hook_state *state)
  24 {
  25         const struct net *net = dev_net(state->in ? state->in : state->out);
  26
  27         return ip6t_do_table(skb, ops->hooknum, state, net->ipv6.ip6table_raw);
  28 }
  29
  30 static struct nf_hook_ops *rawtable_ops __read_mostly;
  31
  32 static int __net_init ip6table_raw_net_init(struct net *net)
  33 {
  34         struct ip6t_replace *repl;
  35
  36         repl = ip6t_alloc_initial_table(&packet_raw);
  37         if (repl == NULL)
  38                 return -ENOMEM;
  39         net->ipv6.ip6table_raw =
  40                 ip6t_register_table(net, &packet_raw, repl);
  41         kfree(repl);
  42         return PTR_ERR_OR_ZERO(net->ipv6.ip6table_raw);
  43 }
  44
  45 static void __net_exit ip6table_raw_net_exit(struct net *net)
  46 {
  47         ip6t_unregister_table(net, net->ipv6.ip6table_raw);
  48 }
  49
  50 static struct pernet_operations ip6table_raw_net_ops = {
  51         .init = ip6table_raw_net_init,
  52         .exit = ip6table_raw_net_exit,
  53 };
  54
  55 static int __init ip6table_raw_init(void)
  56 {
  57         int ret;
  58
  59         ret = register_pernet_subsys(&ip6table_raw_net_ops);
  60         if (ret < 0)
  61                 return ret;
  62
  63         /* Register hooks */
  64         rawtable_ops = xt_hook_link(&packet_raw, ip6table_raw_hook);
  65         if (IS_ERR(rawtable_ops)) {
  66                 ret = PTR_ERR(rawtable_ops);
  67                 goto cleanup_table;
  68         }
  69
  70         return ret;
  71
  72  cleanup_table:
  73         unregister_pernet_subsys(&ip6table_raw_net_ops);
  74         return ret;
  75 }
  76
  77 static void __exit ip6table_raw_fini(void)
  78 {
  79         xt_hook_unlink(&packet_raw, rawtable_ops);
  80         unregister_pernet_subsys(&ip6table_raw_net_ops);
  81 }
  82
  83 module_init(ip6table_raw_init);
  84 module_exit(ip6table_raw_fini);
  85 MODULE_LICENSE("GPL");