root/net/ipv4/netfilter/nft_reject_ipv4.c

DEFINITIONS

1. nft_reject_ipv4_eval
2. nft_reject_ipv4_module_init
3. nft_reject_ipv4_module_exit

   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/ipv4/nf_reject.h>
  17 #include <net/netfilter/nft_reject.h>
  18 
  19 static void nft_reject_ipv4_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_unreach(pkt->skb, priv->icmp_code, nft_hook(pkt));
  28                 break;
  29         case NFT_REJECT_TCP_RST:
  30                 nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
  31                 break;
  32         default:
  33                 break;
  34         }
  35 
  36         regs->verdict.code = NF_DROP;
  37 }
  38 
  39 static struct nft_expr_type nft_reject_ipv4_type;
  40 static const struct nft_expr_ops nft_reject_ipv4_ops = {
  41         .type           = &nft_reject_ipv4_type,
  42         .size           = NFT_EXPR_SIZE(sizeof(struct nft_reject)),
  43         .eval           = nft_reject_ipv4_eval,
  44         .init           = nft_reject_init,
  45         .dump           = nft_reject_dump,
  46         .validate       = nft_reject_validate,
  47 };
  48 
  49 static struct nft_expr_type nft_reject_ipv4_type __read_mostly = {
  50         .family         = NFPROTO_IPV4,
  51         .name           = "reject",
  52         .ops            = &nft_reject_ipv4_ops,
  53         .policy         = nft_reject_policy,
  54         .maxattr        = NFTA_REJECT_MAX,
  55         .owner          = THIS_MODULE,
  56 };
  57 
  58 static int __init nft_reject_ipv4_module_init(void)
  59 {
  60         return nft_register_expr(&nft_reject_ipv4_type);
  61 }
  62 
  63 static void __exit nft_reject_ipv4_module_exit(void)
  64 {
  65         nft_unregister_expr(&nft_reject_ipv4_type);
  66 }
  67 
  68 module_init(nft_reject_ipv4_module_init);
  69 module_exit(nft_reject_ipv4_module_exit);
  70 
  71 MODULE_LICENSE("GPL");
  72 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
  73 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "reject");