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         struct net *net = dev_net((pkt->in != NULL) ? pkt->in : pkt->out);
  28
  29         switch (priv->type) {
  30         case NFT_REJECT_ICMP_UNREACH:
  31                 nf_send_unreach6(net, pkt->skb, priv->icmp_code,
  32                                  pkt->ops->hooknum);
  33                 break;
  34         case NFT_REJECT_TCP_RST:
  35                 nf_send_reset6(net, pkt->skb, pkt->ops->hooknum);
  36                 break;
  37         default:
  38                 break;
  39         }
  40
  41         regs->verdict.code = NF_DROP;
  42 }
  43
  44 static struct nft_expr_type nft_reject_ipv6_type;
  45 static const struct nft_expr_ops nft_reject_ipv6_ops = {
  46         .type           = &nft_reject_ipv6_type,
  47         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
  48         .eval           = nft_reject_ipv6_eval,
  49         .init           = nft_reject_init,
  50         .dump           = nft_reject_dump,
  51 };
  52
  53 static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
  54         .family         = NFPROTO_IPV6,
  55         .name           = "reject",
  56         .ops            = &nft_reject_ipv6_ops,
  57         .policy         = nft_reject_policy,
  58         .maxattr        = NFTA_REJECT_MAX,
  59         .owner          = THIS_MODULE,
  60 };
  61
  62 static int __init nft_reject_ipv6_module_init(void)
  63 {
  64         return nft_register_expr(&nft_reject_ipv6_type);
  65 }
  66
  67 static void __exit nft_reject_ipv6_module_exit(void)
  68 {
  69         nft_unregister_expr(&nft_reject_ipv6_type);
  70 }
  71
  72 module_init(nft_reject_ipv6_module_init);
  73 module_exit(nft_reject_ipv6_module_exit);
  74
  75 MODULE_LICENSE("GPL");
  76 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  77 MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");