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Linux/net/ipv6/netfilter/ip6table_raw.c

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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 #include <linux/slab.h>
  9 
 10 #define RAW_VALID_HOOKS ((1 << NF_INET_PRE_ROUTING) | (1 << NF_INET_LOCAL_OUT))
 11 
 12 static int __net_init ip6table_raw_table_init(struct net *net);
 13 
 14 static const struct xt_table packet_raw = {
 15         .name = "raw",
 16         .valid_hooks = RAW_VALID_HOOKS,
 17         .me = THIS_MODULE,
 18         .af = NFPROTO_IPV6,
 19         .priority = NF_IP6_PRI_RAW,
 20         .table_init = ip6table_raw_table_init,
 21 };
 22 
 23 /* The work comes in here from netfilter.c. */
 24 static unsigned int
 25 ip6table_raw_hook(void *priv, struct sk_buff *skb,
 26                   const struct nf_hook_state *state)
 27 {
 28         return ip6t_do_table(skb, state, state->net->ipv6.ip6table_raw);
 29 }
 30 
 31 static struct nf_hook_ops *rawtable_ops __read_mostly;
 32 
 33 static int __net_init ip6table_raw_table_init(struct net *net)
 34 {
 35         struct ip6t_replace *repl;
 36         int ret;
 37 
 38         if (net->ipv6.ip6table_raw)
 39                 return 0;
 40 
 41         repl = ip6t_alloc_initial_table(&packet_raw);
 42         if (repl == NULL)
 43                 return -ENOMEM;
 44         ret = ip6t_register_table(net, &packet_raw, repl, rawtable_ops,
 45                                   &net->ipv6.ip6table_raw);
 46         kfree(repl);
 47         return ret;
 48 }
 49 
 50 static void __net_exit ip6table_raw_net_exit(struct net *net)
 51 {
 52         if (!net->ipv6.ip6table_raw)
 53                 return;
 54         ip6t_unregister_table(net, net->ipv6.ip6table_raw, rawtable_ops);
 55         net->ipv6.ip6table_raw = NULL;
 56 }
 57 
 58 static struct pernet_operations ip6table_raw_net_ops = {
 59         .exit = ip6table_raw_net_exit,
 60 };
 61 
 62 static int __init ip6table_raw_init(void)
 63 {
 64         int ret;
 65 
 66         /* Register hooks */
 67         rawtable_ops = xt_hook_ops_alloc(&packet_raw, ip6table_raw_hook);
 68         if (IS_ERR(rawtable_ops))
 69                 return PTR_ERR(rawtable_ops);
 70 
 71         ret = register_pernet_subsys(&ip6table_raw_net_ops);
 72         if (ret < 0) {
 73                 kfree(rawtable_ops);
 74                 return ret;
 75         }
 76 
 77         ret = ip6table_raw_table_init(&init_net);
 78         if (ret) {
 79                 unregister_pernet_subsys(&ip6table_raw_net_ops);
 80                 kfree(rawtable_ops);
 81         }
 82         return ret;
 83 }
 84 
 85 static void __exit ip6table_raw_fini(void)
 86 {
 87         unregister_pernet_subsys(&ip6table_raw_net_ops);
 88         kfree(rawtable_ops);
 89 }
 90 
 91 module_init(ip6table_raw_init);
 92 module_exit(ip6table_raw_fini);
 93 MODULE_LICENSE("GPL");
 94 

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