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Linux/net/ipv4/netfilter/nft_reject_ipv4.c

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  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");
 74 

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