net/bridge/netfilter/nft_reject_bridge.c

   1 /*
   2  * Copyright (c) 2014 Pablo Neira Ayuso <pablo@netfilter.org>
   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/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/module.h>
  12 #include <linux/netlink.h>
  13 #include <linux/netfilter.h>
  14 #include <linux/netfilter/nf_tables.h>
  15 #include <net/netfilter/nf_tables.h>
  16 #include <net/netfilter/nft_reject.h>
  17
  18 static void nft_reject_bridge_eval(const struct nft_expr *expr,
  19                                  struct nft_data data[NFT_REG_MAX + 1],
  20                                  const struct nft_pktinfo *pkt)
  21 {
  22         switch (eth_hdr(pkt->skb)->h_proto) {
  23         case htons(ETH_P_IP):
  24                 return nft_reject_ipv4_eval(expr, data, pkt);
  25         case htons(ETH_P_IPV6):
  26                 return nft_reject_ipv6_eval(expr, data, pkt);
  27         default:
  28                 /* No explicit way to reject this protocol, drop it. */
  29                 data[NFT_REG_VERDICT].verdict = NF_DROP;
  30                 break;
  31         }
  32 }
  33
  34 static struct nft_expr_type nft_reject_bridge_type;
  35 static const struct nft_expr_ops nft_reject_bridge_ops = {
  36         .type           = &nft_reject_bridge_type,
  37         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
  38         .eval           = nft_reject_bridge_eval,
  39         .init           = nft_reject_init,
  40         .dump           = nft_reject_dump,
  41 };
  42
  43 static struct nft_expr_type nft_reject_bridge_type __read_mostly = {
  44         .family         = NFPROTO_BRIDGE,
  45         .name           = "reject",
  46         .ops            = &nft_reject_bridge_ops,
  47         .policy         = nft_reject_policy,
  48         .maxattr        = NFTA_REJECT_MAX,
  49         .owner          = THIS_MODULE,
  50 };
  51
  52 static int __init nft_reject_bridge_module_init(void)
  53 {
  54         return nft_register_expr(&nft_reject_bridge_type);
  55 }
  56
  57 static void __exit nft_reject_bridge_module_exit(void)
  58 {
  59         nft_unregister_expr(&nft_reject_bridge_type);
  60 }
  61
  62 module_init(nft_reject_bridge_module_init);
  63 module_exit(nft_reject_bridge_module_exit);
  64
  65 MODULE_LICENSE("GPL");
  66 MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
  67 MODULE_ALIAS_NFT_AF_EXPR(AF_BRIDGE, "reject");