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
   9 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
  10
  11 static const 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 const struct xt_table packet_raw = {
  39         .name = "raw",
  40         .valid_hooks = RAW_VALID_HOOKS,
  41         .me = THIS_MODULE,
  42         .af = NFPROTO_IPV6,
  43         .priority = NF_IP6_PRI_FIRST,
  44 };
  45
  46 /* The work comes in here from netfilter.c. */
  47 static unsigned int
  48 ip6table_raw_hook(unsigned int hook, struct sk_buff *skb,
  49                   const struct net_device *in, const struct net_device *out,
  50                   int (*okfn)(struct sk_buff *))
  51 {
  52         const struct net *net = dev_net((in != NULL) ? in : out);
  53
  54         return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_raw);
  55 }
  56
  57 static struct nf_hook_ops *rawtable_ops __read_mostly;
  58
  59 static int __net_init ip6table_raw_net_init(struct net *net)
  60 {
  61         /* Register table */
  62         net->ipv6.ip6table_raw =
  63                 ip6t_register_table(net, &packet_raw, &initial_table.repl);
  64         if (IS_ERR(net->ipv6.ip6table_raw))
  65                 return PTR_ERR(net->ipv6.ip6table_raw);
  66         return 0;
  67 }
  68
  69 static void __net_exit ip6table_raw_net_exit(struct net *net)
  70 {
  71         ip6t_unregister_table(net, net->ipv6.ip6table_raw);
  72 }
  73
  74 static struct pernet_operations ip6table_raw_net_ops = {
  75         .init = ip6table_raw_net_init,
  76         .exit = ip6table_raw_net_exit,
  77 };
  78
  79 static int __init ip6table_raw_init(void)
  80 {
  81         int ret;
  82
  83         ret = register_pernet_subsys(&ip6table_raw_net_ops);
  84         if (ret < 0)
  85                 return ret;
  86
  87         /* Register hooks */
  88         rawtable_ops = xt_hook_link(&packet_raw, ip6table_raw_hook);
  89         if (IS_ERR(rawtable_ops)) {
  90                 ret = PTR_ERR(rawtable_ops);
  91                 goto cleanup_table;
  92         }
  93
  94         return ret;
  95
  96  cleanup_table:
  97         unregister_pernet_subsys(&ip6table_raw_net_ops);
  98         return ret;
  99 }
 100
 101 static void __exit ip6table_raw_fini(void)
 102 {
 103         xt_hook_unlink(&packet_raw, rawtable_ops);
 104         unregister_pernet_subsys(&ip6table_raw_net_ops);
 105 }
 106
 107 module_init(ip6table_raw_init);
 108 module_exit(ip6table_raw_fini);
 109 MODULE_LICENSE("GPL");