LXR linux/net/ipv6/netfilter/nft_reject

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
   4 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
   5 *
   6 * Development of this code funded by Astaro AG (http://www.astaro.com/)
   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#include <net/netfilter/ipv6/nf_reject.h>
  18
  19static void nft_reject_ipv6_eval(const struct nft_expr *expr,
  20                                 struct nft_regs *regs,
  21                                 const struct nft_pktinfo *pkt)
  22{
  23        struct nft_reject *priv = nft_expr_priv(expr);
  24
  25        switch (priv->type) {
  26        case NFT_REJECT_ICMP_UNREACH:
  27                nf_send_unreach6(nft_net(pkt), pkt->skb, priv->icmp_code,
  28                                 nft_hook(pkt));
  29                break;
  30        case NFT_REJECT_TCP_RST:
  31                nf_send_reset6(nft_net(pkt), nft_sk(pkt), pkt->skb,
  32                               nft_hook(pkt));
  33                break;
  34        default:
  35                break;
  36        }
  37
  38        regs->verdict.code = NF_DROP;
  39}
  40
  41static struct nft_expr_type nft_reject_ipv6_type;
  42static const struct nft_expr_ops nft_reject_ipv6_ops = {
  43        .type           = &nft_reject_ipv6_type,
  44        .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
  45        .eval           = nft_reject_ipv6_eval,
  46        .init           = nft_reject_init,
  47        .dump           = nft_reject_dump,
  48        .validate       = nft_reject_validate,
  49};
  50
  51static struct nft_expr_type nft_reject_ipv6_type __read_mostly = {
  52        .family         = NFPROTO_IPV6,
  53        .name           = "reject",
  54        .ops            = &nft_reject_ipv6_ops,
  55        .policy         = nft_reject_policy,
  56        .maxattr        = NFTA_REJECT_MAX,
  57        .owner          = THIS_MODULE,
  58};
  59
  60static int __init nft_reject_ipv6_module_init(void)
  61{
  62        return nft_register_expr(&nft_reject_ipv6_type);
  63}
  64
  65static void __exit nft_reject_ipv6_module_exit(void)
  66{
  67        nft_unregister_expr(&nft_reject_ipv6_type);
  68}
  69
  70module_init(nft_reject_ipv6_module_init);
  71module_exit(nft_reject_ipv6_module_exit);
  72
  73MODULE_LICENSE("GPL");
  74MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  75MODULE_ALIAS_NFT_AF_EXPR(AF_INET6, "reject");
  76MODULE_DESCRIPTION("IPv6 packet rejection for nftables");
  77