blob: 29f5bd2377b0deaf7ede8ec0573bf71cfeef7478 [file] [log] [blame]
Patrick McHardy96518512013-10-14 11:00:02 +02001/*
Patrick McHardyef1f7df2013-10-10 11:41:20 +02002 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
Eric Leblondbee11dc2013-12-29 12:28:14 +01003 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
Patrick McHardy96518512013-10-14 11:00:02 +02004 *
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>
Patrick McHardycc4723ca2014-02-05 15:03:38 +000019#include <net/netfilter/nft_reject.h>
Pablo Neira Ayuso51b0a5d2014-09-26 14:35:14 +020020#include <linux/icmp.h>
21#include <linux/icmpv6.h>
Eric Leblondbee11dc2013-12-29 12:28:14 +010022
Patrick McHardycc4723ca2014-02-05 15:03:38 +000023const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
Patrick McHardy96518512013-10-14 11:00:02 +020024 [NFTA_REJECT_TYPE] = { .type = NLA_U32 },
25 [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
26};
Patrick McHardycc4723ca2014-02-05 15:03:38 +000027EXPORT_SYMBOL_GPL(nft_reject_policy);
Patrick McHardy96518512013-10-14 11:00:02 +020028
Liping Zhang89e1f6d2016-08-22 01:02:18 +080029int nft_reject_validate(const struct nft_ctx *ctx,
30 const struct nft_expr *expr,
31 const struct nft_data **data)
32{
33 return nft_chain_validate_hooks(ctx->chain,
34 (1 << NF_INET_LOCAL_IN) |
35 (1 << NF_INET_FORWARD) |
36 (1 << NF_INET_LOCAL_OUT));
37}
38EXPORT_SYMBOL_GPL(nft_reject_validate);
39
Patrick McHardycc4723ca2014-02-05 15:03:38 +000040int nft_reject_init(const struct nft_ctx *ctx,
41 const struct nft_expr *expr,
42 const struct nlattr * const tb[])
Patrick McHardy96518512013-10-14 11:00:02 +020043{
44 struct nft_reject *priv = nft_expr_priv(expr);
45
46 if (tb[NFTA_REJECT_TYPE] == NULL)
47 return -EINVAL;
48
49 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
50 switch (priv->type) {
51 case NFT_REJECT_ICMP_UNREACH:
52 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
53 return -EINVAL;
54 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
55 case NFT_REJECT_TCP_RST:
56 break;
57 default:
58 return -EINVAL;
59 }
60
61 return 0;
62}
Patrick McHardycc4723ca2014-02-05 15:03:38 +000063EXPORT_SYMBOL_GPL(nft_reject_init);
Patrick McHardy96518512013-10-14 11:00:02 +020064
Patrick McHardycc4723ca2014-02-05 15:03:38 +000065int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
Patrick McHardy96518512013-10-14 11:00:02 +020066{
67 const struct nft_reject *priv = nft_expr_priv(expr);
68
Eric Leblondbee11dc2013-12-29 12:28:14 +010069 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
Patrick McHardy96518512013-10-14 11:00:02 +020070 goto nla_put_failure;
71
72 switch (priv->type) {
73 case NFT_REJECT_ICMP_UNREACH:
74 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
75 goto nla_put_failure;
76 break;
David S. Miller129d23a2015-04-27 13:20:34 -040077 default:
78 break;
Patrick McHardy96518512013-10-14 11:00:02 +020079 }
80
81 return 0;
82
83nla_put_failure:
84 return -1;
85}
Patrick McHardycc4723ca2014-02-05 15:03:38 +000086EXPORT_SYMBOL_GPL(nft_reject_dump);
Patrick McHardy96518512013-10-14 11:00:02 +020087
Pablo Neira Ayusof0d1f042014-10-07 19:02:11 +020088static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
Pablo Neira Ayuso51b0a5d2014-09-26 14:35:14 +020089 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
90 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
91 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
92 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
93};
94
95int nft_reject_icmp_code(u8 code)
96{
Pablo Neira Ayusof0d1f042014-10-07 19:02:11 +020097 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
Pablo Neira Ayuso51b0a5d2014-09-26 14:35:14 +020098
99 return icmp_code_v4[code];
100}
101
102EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
103
104
Pablo Neira Ayusof0d1f042014-10-07 19:02:11 +0200105static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
Pablo Neira Ayuso51b0a5d2014-09-26 14:35:14 +0200106 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
107 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
108 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
109 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
110};
111
112int nft_reject_icmpv6_code(u8 code)
113{
Pablo Neira Ayusof0d1f042014-10-07 19:02:11 +0200114 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
Pablo Neira Ayuso51b0a5d2014-09-26 14:35:14 +0200115
116 return icmp_code_v6[code];
117}
118
119EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
120
Patrick McHardy96518512013-10-14 11:00:02 +0200121MODULE_LICENSE("GPL");
122MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");