LXR linux/net/ipv4/netfilter/nft_reject

   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/ipv4/nf_reject.h>
  20#include <net/netfilter/nft_reject.h>
  21
  22static void nft_reject_ipv4_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_unreach(pkt->skb, priv->icmp_code, nft_hook(pkt));
  31                break;
  32        case NFT_REJECT_TCP_RST:
  33                nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
  34                break;
  35        default:
  36                break;
  37        }
  38
  39        regs->verdict.code = NF_DROP;
  40}
  41
  42static struct nft_expr_type nft_reject_ipv4_type;
  43static const struct nft_expr_ops nft_reject_ipv4_ops = {
  44        .type           = &nft_reject_ipv4_type,
  45        .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
  46        .eval           = nft_reject_ipv4_eval,
  47        .init           = nft_reject_init,
  48        .dump           = nft_reject_dump,
  49        .validate       = nft_reject_validate,
  50};
  51
  52static struct nft_expr_type nft_reject_ipv4_type __read_mostly = {
  53        .family         = NFPROTO_IPV4,
  54        .name           = "reject",
  55        .ops            = &nft_reject_ipv4_ops,
  56        .policy         = nft_reject_policy,
  57        .maxattr        = NFTA_REJECT_MAX,
  58        .owner          = THIS_MODULE,
  59};
  60
  61static int __init nft_reject_ipv4_module_init(void)
  62{
  63        return nft_register_expr(&nft_reject_ipv4_type);
  64}
  65
  66static void __exit nft_reject_ipv4_module_exit(void)
  67{
  68        nft_unregister_expr(&nft_reject_ipv4_type);
  69}
  70
  71module_init(nft_reject_ipv4_module_init);
  72module_exit(nft_reject_ipv4_module_exit);
  73
  74MODULE_LICENSE("GPL");
  75MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  76MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "reject");
  77