Pileus Git - ~andy/linux/blob - net/ipv4/netfilter/nf_tables_arp.c

   1 /*
   2  * Copyright (c) 2008-2010 Patrick McHardy <kaber@trash.net>
   3  * Copyright (c) 2013 Pablo Neira Ayuso <pablo@netfilter.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Development of this code funded by Astaro AG (http://www.astaro.com/)
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netfilter_arp.h>
  15 #include <net/netfilter/nf_tables.h>
  16
  17 static struct nft_af_info nft_af_arp __read_mostly = {
  18         .family         = NFPROTO_ARP,
  19         .nhooks         = NF_ARP_NUMHOOKS,
  20         .owner          = THIS_MODULE,
  21 };
  22
  23 static int nf_tables_arp_init_net(struct net *net)
  24 {
  25         net->nft.arp = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
  26         if (net->nft.arp== NULL)
  27                 return -ENOMEM;
  28
  29         memcpy(net->nft.arp, &nft_af_arp, sizeof(nft_af_arp));
  30
  31         if (nft_register_afinfo(net, net->nft.arp) < 0)
  32                 goto err;
  33
  34         return 0;
  35 err:
  36         kfree(net->nft.arp);
  37         return -ENOMEM;
  38 }
  39
  40 static void nf_tables_arp_exit_net(struct net *net)
  41 {
  42         nft_unregister_afinfo(net->nft.arp);
  43         kfree(net->nft.arp);
  44 }
  45
  46 static struct pernet_operations nf_tables_arp_net_ops = {
  47         .init   = nf_tables_arp_init_net,
  48         .exit   = nf_tables_arp_exit_net,
  49 };
  50
  51 static unsigned int
  52 nft_do_chain_arp(const struct nf_hook_ops *ops,
  53                   struct sk_buff *skb,
  54                   const struct net_device *in,
  55                   const struct net_device *out,
  56                   int (*okfn)(struct sk_buff *))
  57 {
  58         struct nft_pktinfo pkt;
  59
  60         nft_set_pktinfo(&pkt, ops, skb, in, out);
  61
  62         return nft_do_chain_pktinfo(&pkt, ops);
  63 }
  64
  65 static struct nf_chain_type filter_arp = {
  66         .family         = NFPROTO_ARP,
  67         .name           = "filter",
  68         .type           = NFT_CHAIN_T_DEFAULT,
  69         .hook_mask      = (1 << NF_ARP_IN) |
  70                           (1 << NF_ARP_OUT) |
  71                           (1 << NF_ARP_FORWARD),
  72         .fn             = {
  73                 [NF_ARP_IN]             = nft_do_chain_arp,
  74                 [NF_ARP_OUT]            = nft_do_chain_arp,
  75                 [NF_ARP_FORWARD]        = nft_do_chain_arp,
  76         },
  77 };
  78
  79 static int __init nf_tables_arp_init(void)
  80 {
  81         int ret;
  82
  83         nft_register_chain_type(&filter_arp);
  84         ret = register_pernet_subsys(&nf_tables_arp_net_ops);
  85         if (ret < 0)
  86                 nft_unregister_chain_type(&filter_arp);
  87
  88         return ret;
  89 }
  90
  91 static void __exit nf_tables_arp_exit(void)
  92 {
  93         unregister_pernet_subsys(&nf_tables_arp_net_ops);
  94         nft_unregister_chain_type(&filter_arp);
  95 }
  96
  97 module_init(nf_tables_arp_init);
  98 module_exit(nf_tables_arp_exit);
  99
 100 MODULE_LICENSE("GPL");
 101 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 102 MODULE_ALIAS_NFT_FAMILY(3); /* NFPROTO_ARP */