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