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   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_IP6_PRE_ROUTING) | (1 << NF_IP6_LOCAL_OUT))
  10
  11 #if 0
  12 #define DEBUGP(x, args...)      printk(KERN_DEBUG x, ## args)
  13 #else
  14 #define DEBUGP(x, args...)
  15 #endif
  16
  17 static struct
  18 {
  19         struct ip6t_replace repl;
  20         struct ip6t_standard entries[2];
  21         struct ip6t_error term;
  22 } initial_table __initdata = {
  23         .repl = {
  24                 .name = "raw",
  25                 .valid_hooks = RAW_VALID_HOOKS,
  26                 .num_entries = 3,
  27                 .size = sizeof(struct ip6t_standard) * 2 + sizeof(struct ip6t_error),
  28                 .hook_entry = {
  29                         [NF_IP6_PRE_ROUTING] = 0,
  30                         [NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard)
  31                 },
  32                 .underflow = {
  33                         [NF_IP6_PRE_ROUTING] = 0,
  34                         [NF_IP6_LOCAL_OUT] = sizeof(struct ip6t_standard)
  35                 },
  36         },
  37         .entries = {
  38                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* PRE_ROUTING */
  39                 IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_OUT */
  40         },
  41         .term = IP6T_ERROR_INIT,                /* ERROR */
  42 };
  43
  44 static struct xt_table packet_raw = {
  45         .name = "raw",
  46         .valid_hooks = RAW_VALID_HOOKS,
  47         .lock = RW_LOCK_UNLOCKED,
  48         .me = THIS_MODULE,
  49         .af = AF_INET6,
  50 };
  51
  52 /* The work comes in here from netfilter.c. */
  53 static unsigned int
  54 ip6t_hook(unsigned int hook,
  55          struct sk_buff **pskb,
  56          const struct net_device *in,
  57          const struct net_device *out,
  58          int (*okfn)(struct sk_buff *))
  59 {
  60         return ip6t_do_table(pskb, hook, in, out, &packet_raw);
  61 }
  62
  63 static struct nf_hook_ops ip6t_ops[] = {
  64         {
  65           .hook = ip6t_hook,
  66           .pf = PF_INET6,
  67           .hooknum = NF_IP6_PRE_ROUTING,
  68           .priority = NF_IP6_PRI_FIRST,
  69           .owner = THIS_MODULE,
  70         },
  71         {
  72           .hook = ip6t_hook,
  73           .pf = PF_INET6,
  74           .hooknum = NF_IP6_LOCAL_OUT,
  75           .priority = NF_IP6_PRI_FIRST,
  76           .owner = THIS_MODULE,
  77         },
  78 };
  79
  80 static int __init ip6table_raw_init(void)
  81 {
  82         int ret;
  83
  84         /* Register table */
  85         ret = ip6t_register_table(&packet_raw, &initial_table.repl);
  86         if (ret < 0)
  87                 return ret;
  88
  89         /* Register hooks */
  90         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
  91         if (ret < 0)
  92                 goto cleanup_table;
  93
  94         return ret;
  95
  96  cleanup_table:
  97         ip6t_unregister_table(&packet_raw);
  98         return ret;
  99 }
 100
 101 static void __exit ip6table_raw_fini(void)
 102 {
 103         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
 104         ip6t_unregister_table(&packet_raw);
 105 }
 106
 107 module_init(ip6table_raw_init);
 108 module_exit(ip6table_raw_fini);
 109 MODULE_LICENSE("GPL");