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 22 static 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 42 static struct nft_expr_type nft_reject_ipv4_type; 43 static 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 52 static 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 61 static int __init nft_reject_ipv4_module_init(void) 62 { 63 return nft_register_expr(&nft_reject_ipv4_type); 64 } 65 66 static void __exit nft_reject_ipv4_module_exit(void) 67 { 68 nft_unregister_expr(&nft_reject_ipv4_type); 69 } 70 71 module_init(nft_reject_ipv4_module_init); 72 module_exit(nft_reject_ipv4_module_exit); 73 74 MODULE_LICENSE("GPL"); 75 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 76 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "reject"); 77