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/nft_reject.h> 20 #include <linux/icmp.h> 21 #include <linux/icmpv6.h> 22 23 const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = { 24 [NFTA_REJECT_TYPE] = { .type = NLA_U32 }, 25 [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 }, 26 }; 27 EXPORT_SYMBOL_GPL(nft_reject_policy); 28 29 int nft_reject_init(const struct nft_ctx *ctx, 30 const struct nft_expr *expr, 31 const struct nlattr * const tb[]) 32 { 33 struct nft_reject *priv = nft_expr_priv(expr); 34 35 if (tb[NFTA_REJECT_TYPE] == NULL) 36 return -EINVAL; 37 38 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE])); 39 switch (priv->type) { 40 case NFT_REJECT_ICMP_UNREACH: 41 if (tb[NFTA_REJECT_ICMP_CODE] == NULL) 42 return -EINVAL; 43 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]); 44 case NFT_REJECT_TCP_RST: 45 break; 46 default: 47 return -EINVAL; 48 } 49 50 return 0; 51 } 52 EXPORT_SYMBOL_GPL(nft_reject_init); 53 54 int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr) 55 { 56 const struct nft_reject *priv = nft_expr_priv(expr); 57 58 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type))) 59 goto nla_put_failure; 60 61 switch (priv->type) { 62 case NFT_REJECT_ICMP_UNREACH: 63 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code)) 64 goto nla_put_failure; 65 break; 66 default: 67 break; 68 } 69 70 return 0; 71 72 nla_put_failure: 73 return -1; 74 } 75 EXPORT_SYMBOL_GPL(nft_reject_dump); 76 77 static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = { 78 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH, 79 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH, 80 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH, 81 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED, 82 }; 83 84 int nft_reject_icmp_code(u8 code) 85 { 86 BUG_ON(code > NFT_REJECT_ICMPX_MAX); 87 88 return icmp_code_v4[code]; 89 } 90 91 EXPORT_SYMBOL_GPL(nft_reject_icmp_code); 92 93 94 static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = { 95 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE, 96 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH, 97 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH, 98 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED, 99 }; 100 101 int nft_reject_icmpv6_code(u8 code) 102 { 103 BUG_ON(code > NFT_REJECT_ICMPX_MAX); 104 105 return icmp_code_v6[code]; 106 } 107 108 EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code); 109 110 MODULE_LICENSE("GPL"); 111 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); 112