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 __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 struct xt_table packet_raw = {
  39         .name = "raw",
  40         .valid_hooks = RAW_VALID_HOOKS,
  41         .lock = __RW_LOCK_UNLOCKED(packet_raw.lock),
  42         .me = THIS_MODULE,
  43         .af = AF_INET6,
  44 };
  45
  46 /* The work comes in here from netfilter.c. */
  47 static unsigned int
  48 ip6t_pre_routing_hook(unsigned int hook,
  49          struct sk_buff *skb,
  50          const struct net_device *in,
  51          const struct net_device *out,
  52          int (*okfn)(struct sk_buff *))
  53 {
  54         return ip6t_do_table(skb, hook, in, out,
  55                              dev_net(in)->ipv6.ip6table_raw);
  56 }
  57
  58 static unsigned int
  59 ip6t_local_out_hook(unsigned int hook,
  60          struct sk_buff *skb,
  61          const struct net_device *in,
  62          const struct net_device *out,
  63          int (*okfn)(struct sk_buff *))
  64 {
  65         return ip6t_do_table(skb, hook, in, out,
  66                              dev_net(out)->ipv6.ip6table_raw);
  67 }
  68
  69 static struct nf_hook_ops ip6t_ops[] __read_mostly = {
  70         {
  71           .hook = ip6t_pre_routing_hook,
  72           .pf = PF_INET6,
  73           .hooknum = NF_INET_PRE_ROUTING,
  74           .priority = NF_IP6_PRI_FIRST,
  75           .owner = THIS_MODULE,
  76         },
  77         {
  78           .hook = ip6t_local_out_hook,
  79           .pf = PF_INET6,
  80           .hooknum = NF_INET_LOCAL_OUT,
  81           .priority = NF_IP6_PRI_FIRST,
  82           .owner = THIS_MODULE,
  83         },
  84 };
  85
  86 static int __net_init ip6table_raw_net_init(struct net *net)
  87 {
  88         /* Register table */
  89         net->ipv6.ip6table_raw =
  90                 ip6t_register_table(net, &packet_raw, &initial_table.repl);
  91         if (IS_ERR(net->ipv6.ip6table_raw))
  92                 return PTR_ERR(net->ipv6.ip6table_raw);
  93         return 0;
  94 }
  95
  96 static void __net_exit ip6table_raw_net_exit(struct net *net)
  97 {
  98         ip6t_unregister_table(net->ipv6.ip6table_raw);
  99 }
 100
 101 static struct pernet_operations ip6table_raw_net_ops = {
 102         .init = ip6table_raw_net_init,
 103         .exit = ip6table_raw_net_exit,
 104 };
 105
 106 static int __init ip6table_raw_init(void)
 107 {
 108         int ret;
 109
 110         ret = register_pernet_subsys(&ip6table_raw_net_ops);
 111         if (ret < 0)
 112                 return ret;
 113
 114         /* Register hooks */
 115         ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
 116         if (ret < 0)
 117                 goto cleanup_table;
 118
 119         return ret;
 120
 121  cleanup_table:
 122         unregister_pernet_subsys(&ip6table_raw_net_ops);
 123         return ret;
 124 }
 125
 126 static void __exit ip6table_raw_fini(void)
 127 {
 128         nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
 129         unregister_pernet_subsys(&ip6table_raw_net_ops);
 130 }
 131
 132 module_init(ip6table_raw_init);
 133 module_exit(ip6table_raw_fini);
 134 MODULE_LICENSE("GPL");