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
23const 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};
27EXPORT_SYMBOL_GPL(nft_reject_policy);
28
29int 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}
52EXPORT_SYMBOL_GPL(nft_reject_init);
53
54int 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
72nla_put_failure:
73	return -1;
74}
75EXPORT_SYMBOL_GPL(nft_reject_dump);
76
77static 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
84int nft_reject_icmp_code(u8 code)
85{
86	BUG_ON(code > NFT_REJECT_ICMPX_MAX);
87
88	return icmp_code_v4[code];
89}
90
91EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
92
93
94static 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
101int nft_reject_icmpv6_code(u8 code)
102{
103	BUG_ON(code > NFT_REJECT_ICMPX_MAX);
104
105	return icmp_code_v6[code];
106}
107
108EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
109
110MODULE_LICENSE("GPL");
111MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
112