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/icmp.h> 20 #include <net/netfilter/ipv4/nf_reject.h> 21 #include <net/netfilter/nft_reject.h> 22 23 void nft_reject_ipv4_eval(const struct nft_expr *expr, 24 struct nft_data data[NFT_REG_MAX + 1], 25 const struct nft_pktinfo *pkt) 26 { 27 struct nft_reject *priv = nft_expr_priv(expr); 28 29 switch (priv->type) { 30 case NFT_REJECT_ICMP_UNREACH: 31 nf_send_unreach(pkt->skb, priv->icmp_code); 32 break; 33 case NFT_REJECT_TCP_RST: 34 nf_send_reset(pkt->skb, pkt->ops->hooknum); 35 break; 36 } 37 38 data[NFT_REG_VERDICT].verdict = NF_DROP; 39 } 40 EXPORT_SYMBOL_GPL(nft_reject_ipv4_eval); 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 }; 50 51 static struct nft_expr_type nft_reject_ipv4_type __read_mostly = { 52 .family = NFPROTO_IPV4, 53 .name = "reject", 54 .ops = &nft_reject_ipv4_ops, 55 .policy = nft_reject_policy, 56 .maxattr = NFTA_REJECT_MAX, 57 .owner = THIS_MODULE, 58 }; 59 60 static int __init nft_reject_ipv4_module_init(void) 61 { 62 return nft_register_expr(&nft_reject_ipv4_type); 63 } 64 65 static void __exit nft_reject_ipv4_module_exit(void) 66 { 67 nft_unregister_expr(&nft_reject_ipv4_type); 68 } 69 70 module_init(nft_reject_ipv4_module_init); 71 module_exit(nft_reject_ipv4_module_exit); 72 73 MODULE_LICENSE("GPL"); 74 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 75 MODULE_ALIAS_NFT_AF_EXPR(AF_INET, "reject"); 76