net/bridge/netfilter/nf_tables_bridge.c

   1 /*
   2  * Copyright (c) 2008 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/init.h>
  13 #include <linux/module.h>
  14 #include <linux/netfilter_bridge.h>
  15 #include <net/netfilter/nf_tables.h>
  16
  17 static unsigned int
  18 nft_do_chain_bridge(const struct nf_hook_ops *ops,
  19                     struct sk_buff *skb,
  20                     const struct net_device *in,
  21                     const struct net_device *out,
  22                     int (*okfn)(struct sk_buff *))
  23 {
  24         struct nft_pktinfo pkt;
  25
  26         nft_set_pktinfo(&pkt, ops, skb, in, out);
  27
  28         return nft_do_chain(&pkt, ops);
  29 }
  30
  31 static struct nft_af_info nft_af_bridge __read_mostly = {
  32         .family         = NFPROTO_BRIDGE,
  33         .nhooks         = NF_BR_NUMHOOKS,
  34         .owner          = THIS_MODULE,
  35         .nops           = 1,
  36         .hooks          = {
  37                 [NF_BR_PRE_ROUTING]     = nft_do_chain_bridge,
  38                 [NF_BR_LOCAL_IN]        = nft_do_chain_bridge,
  39                 [NF_BR_FORWARD]         = nft_do_chain_bridge,
  40                 [NF_BR_LOCAL_OUT]       = nft_do_chain_bridge,
  41                 [NF_BR_POST_ROUTING]    = nft_do_chain_bridge,
  42         },
  43 };
  44
  45 static int nf_tables_bridge_init_net(struct net *net)
  46 {
  47         net->nft.bridge = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
  48         if (net->nft.bridge == NULL)
  49                 return -ENOMEM;
  50
  51         memcpy(net->nft.bridge, &nft_af_bridge, sizeof(nft_af_bridge));
  52
  53         if (nft_register_afinfo(net, net->nft.bridge) < 0)
  54                 goto err;
  55
  56         return 0;
  57 err:
  58         kfree(net->nft.bridge);
  59         return -ENOMEM;
  60 }
  61
  62 static void nf_tables_bridge_exit_net(struct net *net)
  63 {
  64         nft_unregister_afinfo(net->nft.bridge);
  65         kfree(net->nft.bridge);
  66 }
  67
  68 static struct pernet_operations nf_tables_bridge_net_ops = {
  69         .init   = nf_tables_bridge_init_net,
  70         .exit   = nf_tables_bridge_exit_net,
  71 };
  72
  73 static const struct nf_chain_type filter_bridge = {
  74         .name           = "filter",
  75         .type           = NFT_CHAIN_T_DEFAULT,
  76         .family         = NFPROTO_BRIDGE,
  77         .owner          = THIS_MODULE,
  78         .hook_mask      = (1 << NF_BR_LOCAL_IN) |
  79                           (1 << NF_BR_FORWARD) |
  80                           (1 << NF_BR_LOCAL_OUT),
  81 };
  82
  83 static int __init nf_tables_bridge_init(void)
  84 {
  85         int ret;
  86
  87         nft_register_chain_type(&filter_bridge);
  88         ret = register_pernet_subsys(&nf_tables_bridge_net_ops);
  89         if (ret < 0)
  90                 nft_unregister_chain_type(&filter_bridge);
  91
  92         return ret;
  93 }
  94
  95 static void __exit nf_tables_bridge_exit(void)
  96 {
  97         unregister_pernet_subsys(&nf_tables_bridge_net_ops);
  98         nft_unregister_chain_type(&filter_bridge);
  99 }
 100
 101 module_init(nf_tables_bridge_init);
 102 module_exit(nf_tables_bridge_exit);
 103
 104 MODULE_LICENSE("GPL");
 105 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 106 MODULE_ALIAS_NFT_FAMILY(AF_BRIDGE);