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 struct
  12 {
  13         struct ip6t_replace repl;
  14         struct ip6t_standard entries[2];
  15         struct ip6t_error term;
  16 } initial_table __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 struct xt_table __packet_raw = {
  39         .name = "raw",
  40         .valid_hooks = RAW_VALID_HOOKS,
  41         .lock = RW_LOCK_UNLOCKED,
  42         .me = THIS_MODULE,
  43         .af = AF_INET6,
  44 };
  45 static struct xt_table *packet_raw;
  46
  47 /* The work comes in here from netfilter.c. */
  48 static unsigned int
  49 ip6t_hook(unsigned int hook,
  50          struct sk_buff *skb,
  51          const struct net_device *in,
  52          const struct net_device *out,
  53          int (*okfn)(struct sk_buff *))
  54 {
  55         return ip6t_do_table(skb, hook, in, out, packet_raw);
  56 }
  57
  58 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
  59         {
  60           .hook = ip6t_hook,
  61           .pf = PF_INET6,
  62           .hooknum = NF_INET_PRE_ROUTING,
  63           .priority = NF_IP6_PRI_FIRST,
  64           .owner = THIS_MODULE,
  65         },
  66         {
  67           .hook = ip6t_hook,
  68           .pf = PF_INET6,
  69           .hooknum = NF_INET_LOCAL_OUT,
  70           .priority = NF_IP6_PRI_FIRST,
  71           .owner = THIS_MODULE,
  72         },
  73 };
  74
  75 static int __init ip6table_raw_init(void)
  76 {
  77         int ret;
  78
  79         /* Register table */
  80         packet_raw = ip6t_register_table(&init_net, &__packet_raw, &initial_table.repl);
  81         if (IS_ERR(packet_raw))
  82                 return PTR_ERR(packet_raw);
  83
  84         /* Register hooks */
  85         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
  86         if (ret < 0)
  87                 goto cleanup_table;
  88
  89         return ret;
  90
  91  cleanup_table:
  92         ip6t_unregister_table(packet_raw);
  93         return ret;
  94 }
  95
  96 static void __exit ip6table_raw_fini(void)
  97 {
  98         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
  99         ip6t_unregister_table(packet_raw);
 100 }
 101
 102 module_init(ip6table_raw_init);
 103 module_exit(ip6table_raw_fini);
 104 MODULE_LICENSE("GPL");