net/netfilter/nf_tables_inet.c

   1 /*
   2  * Copyright (c) 2012-2014 Patrick McHardy <kaber@trash.net>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/ip.h>
  12 #include <linux/netfilter_ipv4.h>
  13 #include <linux/netfilter_ipv6.h>
  14 #include <net/netfilter/nf_tables.h>
  15 #include <net/netfilter/nf_tables_ipv4.h>
  16 #include <net/netfilter/nf_tables_ipv6.h>
  17 #include <net/ip.h>
  18
  19 static void nft_inet_hook_ops_init(struct nf_hook_ops *ops, unsigned int n)
  20 {
  21         struct nft_af_info *afi;
  22
  23         if (n == 1)
  24                 afi = &nft_af_ipv4;
  25         else
  26                 afi = &nft_af_ipv6;
  27
  28         ops->pf = afi->family;
  29         if (afi->hooks[ops->hooknum])
  30                 ops->hook = afi->hooks[ops->hooknum];
  31 }
  32
  33 static struct nft_af_info nft_af_inet __read_mostly = {
  34         .family         = NFPROTO_INET,
  35         .nhooks         = NF_INET_NUMHOOKS,
  36         .owner          = THIS_MODULE,
  37         .nops           = 2,
  38         .hook_ops_init  = nft_inet_hook_ops_init,
  39 };
  40
  41 static int __net_init nf_tables_inet_init_net(struct net *net)
  42 {
  43         net->nft.inet = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
  44         if (net->nft.inet == NULL)
  45                 return -ENOMEM;
  46         memcpy(net->nft.inet, &nft_af_inet, sizeof(nft_af_inet));
  47
  48         if (nft_register_afinfo(net, net->nft.inet) < 0)
  49                 goto err;
  50
  51         return 0;
  52
  53 err:
  54         kfree(net->nft.inet);
  55         return -ENOMEM;
  56 }
  57
  58 static void __net_exit nf_tables_inet_exit_net(struct net *net)
  59 {
  60         nft_unregister_afinfo(net, net->nft.inet);
  61         kfree(net->nft.inet);
  62 }
  63
  64 static struct pernet_operations nf_tables_inet_net_ops = {
  65         .init   = nf_tables_inet_init_net,
  66         .exit   = nf_tables_inet_exit_net,
  67 };
  68
  69 static const struct nf_chain_type filter_inet = {
  70         .name           = "filter",
  71         .type           = NFT_CHAIN_T_DEFAULT,
  72         .family         = NFPROTO_INET,
  73         .owner          = THIS_MODULE,
  74         .hook_mask      = (1 << NF_INET_LOCAL_IN) |
  75                           (1 << NF_INET_LOCAL_OUT) |
  76                           (1 << NF_INET_FORWARD) |
  77                           (1 << NF_INET_PRE_ROUTING) |
  78                           (1 << NF_INET_POST_ROUTING),
  79 };
  80
  81 static int __init nf_tables_inet_init(void)
  82 {
  83         int ret;
  84
  85         ret = nft_register_chain_type(&filter_inet);
  86         if (ret < 0)
  87                 return ret;
  88
  89         ret = register_pernet_subsys(&nf_tables_inet_net_ops);
  90         if (ret < 0)
  91                 nft_unregister_chain_type(&filter_inet);
  92
  93         return ret;
  94 }
  95
  96 static void __exit nf_tables_inet_exit(void)
  97 {
  98         unregister_pernet_subsys(&nf_tables_inet_net_ops);
  99         nft_unregister_chain_type(&filter_inet);
 100 }
 101
 102 module_init(nf_tables_inet_init);
 103 module_exit(nf_tables_inet_exit);
 104
 105 MODULE_LICENSE("GPL");
 106 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 107 MODULE_ALIAS_NFT_FAMILY(1);