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 int __net_init ip6table_raw_table_init(struct net *net);
  13
  14 static const struct xt_table packet_raw = {
  15         .name = "raw",
  16         .valid_hooks = RAW_VALID_HOOKS,
  17         .me = THIS_MODULE,
  18         .af = NFPROTO_IPV6,
  19         .priority = NF_IP6_PRI_RAW,
  20         .table_init = ip6table_raw_table_init,
  21 };
  22
  23 /* The work comes in here from netfilter.c. */
  24 static unsigned int
  25 ip6table_raw_hook(void *priv, struct sk_buff *skb,
  26                   const struct nf_hook_state *state)
  27 {
  28         return ip6t_do_table(skb, state, state->net->ipv6.ip6table_raw);
  29 }
  30
  31 static struct nf_hook_ops *rawtable_ops __read_mostly;
  32
  33 static int __net_init ip6table_raw_table_init(struct net *net)
  34 {
  35         struct ip6t_replace *repl;
  36         int ret;
  37
  38         if (net->ipv6.ip6table_raw)
  39                 return 0;
  40
  41         repl = ip6t_alloc_initial_table(&packet_raw);
  42         if (repl == NULL)
  43                 return -ENOMEM;
  44         ret = ip6t_register_table(net, &packet_raw, repl, rawtable_ops,
  45                                   &net->ipv6.ip6table_raw);
  46         kfree(repl);
  47         return ret;
  48 }
  49
  50 static void __net_exit ip6table_raw_net_exit(struct net *net)
  51 {
  52         if (!net->ipv6.ip6table_raw)
  53                 return;
  54         ip6t_unregister_table(net, net->ipv6.ip6table_raw, rawtable_ops);
  55         net->ipv6.ip6table_raw = NULL;
  56 }
  57
  58 static struct pernet_operations ip6table_raw_net_ops = {
  59         .exit = ip6table_raw_net_exit,
  60 };
  61
  62 static int __init ip6table_raw_init(void)
  63 {
  64         int ret;
  65
  66         /* Register hooks */
  67         rawtable_ops = xt_hook_ops_alloc(&packet_raw, ip6table_raw_hook);
  68         if (IS_ERR(rawtable_ops))
  69                 return PTR_ERR(rawtable_ops);
  70
  71         ret = register_pernet_subsys(&ip6table_raw_net_ops);
  72         if (ret < 0) {
  73                 kfree(rawtable_ops);
  74                 return ret;
  75         }
  76
  77         ret = ip6table_raw_table_init(&init_net);
  78         if (ret) {
  79                 unregister_pernet_subsys(&ip6table_raw_net_ops);
  80                 kfree(rawtable_ops);
  81         }
  82         return ret;
  83 }
  84
  85 static void __exit ip6table_raw_fini(void)
  86 {
  87         unregister_pernet_subsys(&ip6table_raw_net_ops);
  88         kfree(rawtable_ops);
  89 }
  90
  91 module_init(ip6table_raw_init);
  92 module_exit(ip6table_raw_fini);
  93 MODULE_LICENSE("GPL");