net/ipv6/netfilter/nft_reject_ipv6.c

   1 /*
   2  * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
   3  * Copyright (c) 2013 Eric Leblond <eric@regit.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/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/netlink.h>
  16 #include <linux/netfilter.h>
  17 #include <linux/netfilter/nf_tables.h>
  18 #include <net/netfilter/nf_tables.h>
  19 #include <net/netfilter/nft_reject.h>
  20 #include <net/netfilter/ipv6/nf_reject.h>
  21
  22 static void nft_reject_ipv6_eval(const struct nft_expr *expr,
  23                                  struct nft_regs *regs,
  24                                  const struct nft_pktinfo *pkt)
  25 {
  26         struct nft_reject *priv = nft_expr_priv(expr);
  27
  28         switch (priv->type) {
  29         case NFT_REJECT_ICMP_UNREACH:
  30                 nf_send_unreach6(pkt->net, pkt->skb, priv->icmp_code,
  31                                  pkt->hook);
  32                 break;
  33         case NFT_REJECT_TCP_RST:
  34                 nf_send_reset6(pkt->net, pkt->skb, pkt->hook);
  35                 break;
  36         default:
  37                 break;
  38         }
  39
  40         regs->verdict.code = NF_DROP;
  41 }
  42
  43 static struct nft_expr_type nft_reject_ipv6_type;
  44 static const struct nft_expr_ops nft_reject_ipv6_ops = {
  45         .type           = &nft_reject_ipv6_type,
  46         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
  47         .eval           = nft_reject_ipv6_eval,
  48         .init           = nft_reject_init,
  49         .dump           = nft_reject_dump,
  50 };
  51
  52 static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
  53         .family         = NFPROTO_IPV6,
  54         .name           = "reject",
  55         .ops            = &nft_reject_ipv6_ops,
  56         .policy         = nft_reject_policy,
  57         .maxattr        = NFTA_REJECT_MAX,
  58         .owner          = THIS_MODULE,
  59 };
  60
  61 static int __init nft_reject_ipv6_module_init(void)
  62 {
  63         return nft_register_expr(&nft_reject_ipv6_type);
  64 }
  65
  66 static void __exit nft_reject_ipv6_module_exit(void)
  67 {
  68         nft_unregister_expr(&nft_reject_ipv6_type);
  69 }
  70
  71 module_init(nft_reject_ipv6_module_init);
  72 module_exit(nft_reject_ipv6_module_exit);
  73
  74 MODULE_LICENSE("GPL");
  75 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");