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 };
  44
  45 /* The work comes in here from netfilter.c. */
  46 static unsigned int
  47 ip6t_pre_routing_hook(unsigned int hook,
  48          struct sk_buff *skb,
  49          const struct net_device *in,
  50          const struct net_device *out,
  51          int (*okfn)(struct sk_buff *))
  52 {
  53         return ip6t_do_table(skb, hook, in, out,
  54                              dev_net(in)->ipv6.ip6table_raw);
  55 }
  56
  57 static unsigned int
  58 ip6t_local_out_hook(unsigned int hook,
  59          struct sk_buff *skb,
  60          const struct net_device *in,
  61          const struct net_device *out,
  62          int (*okfn)(struct sk_buff *))
  63 {
  64         return ip6t_do_table(skb, hook, in, out,
  65                              dev_net(out)->ipv6.ip6table_raw);
  66 }
  67
  68 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
  69         {
  70           .hook = ip6t_pre_routing_hook,
  71           .pf = NFPROTO_IPV6,
  72           .hooknum = NF_INET_PRE_ROUTING,
  73           .priority = NF_IP6_PRI_FIRST,
  74           .owner = THIS_MODULE,
  75         },
  76         {
  77           .hook = ip6t_local_out_hook,
  78           .pf = NFPROTO_IPV6,
  79           .hooknum = NF_INET_LOCAL_OUT,
  80           .priority = NF_IP6_PRI_FIRST,
  81           .owner = THIS_MODULE,
  82         },
  83 };
  84
  85 static int __net_init ip6table_raw_net_init(struct net *net)
  86 {
  87         /* Register table */
  88         net->ipv6.ip6table_raw =
  89                 ip6t_register_table(net, &packet_raw, &initial_table.repl);
  90         if (IS_ERR(net->ipv6.ip6table_raw))
  91                 return PTR_ERR(net->ipv6.ip6table_raw);
  92         return 0;
  93 }
  94
  95 static void __net_exit ip6table_raw_net_exit(struct net *net)
  96 {
  97         ip6t_unregister_table(net->ipv6.ip6table_raw);
  98 }
  99
 100 static struct pernet_operations ip6table_raw_net_ops = {
 101         .init = ip6table_raw_net_init,
 102         .exit = ip6table_raw_net_exit,
 103 };
 104
 105 static int __init ip6table_raw_init(void)
 106 {
 107         int ret;
 108
 109         ret = register_pernet_subsys(&ip6table_raw_net_ops);
 110         if (ret < 0)
 111                 return ret;
 112
 113         /* Register hooks */
 114         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
 115         if (ret < 0)
 116                 goto cleanup_table;
 117
 118         return ret;
 119
 120  cleanup_table:
 121         unregister_pernet_subsys(&ip6table_raw_net_ops);
 122         return ret;
 123 }
 124
 125 static void __exit ip6table_raw_fini(void)
 126 {
 127         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
 128         unregister_pernet_subsys(&ip6table_raw_net_ops);
 129 }
 130
 131 module_init(ip6table_raw_init);
 132 module_exit(ip6table_raw_fini);
 133 MODULE_LICENSE("GPL");