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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
5 *
6 * Development of this code funded by Astaro AG (http://www.astaro.com/)
7 */
8
9#include <linux/kernel.h>
10#include <linux/init.h>
11#include <linux/module.h>
12#include <linux/netlink.h>
13#include <linux/netfilter.h>
14#include <linux/netfilter/nf_tables.h>
15#include <net/netfilter/nf_tables.h>
16#include <net/netfilter/nft_reject.h>
17#include <linux/icmp.h>
18#include <linux/icmpv6.h>
19
20const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
21 [NFTA_REJECT_TYPE] = { .type = NLA_U32 },
22 [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 },
23};
24EXPORT_SYMBOL_GPL(nft_reject_policy);
25
26int nft_reject_validate(const struct nft_ctx *ctx,
27 const struct nft_expr *expr,
28 const struct nft_data **data)
29{
30 return nft_chain_validate_hooks(ctx->chain,
31 (1 << NF_INET_LOCAL_IN) |
32 (1 << NF_INET_FORWARD) |
33 (1 << NF_INET_LOCAL_OUT));
34}
35EXPORT_SYMBOL_GPL(nft_reject_validate);
36
37int nft_reject_init(const struct nft_ctx *ctx,
38 const struct nft_expr *expr,
39 const struct nlattr * const tb[])
40{
41 struct nft_reject *priv = nft_expr_priv(expr);
42
43 if (tb[NFTA_REJECT_TYPE] == NULL)
44 return -EINVAL;
45
46 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
47 switch (priv->type) {
48 case NFT_REJECT_ICMP_UNREACH:
49 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
50 return -EINVAL;
51 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
52 case NFT_REJECT_TCP_RST:
53 break;
54 default:
55 return -EINVAL;
56 }
57
58 return 0;
59}
60EXPORT_SYMBOL_GPL(nft_reject_init);
61
62int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
63{
64 const struct nft_reject *priv = nft_expr_priv(expr);
65
66 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
67 goto nla_put_failure;
68
69 switch (priv->type) {
70 case NFT_REJECT_ICMP_UNREACH:
71 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
72 goto nla_put_failure;
73 break;
74 default:
75 break;
76 }
77
78 return 0;
79
80nla_put_failure:
81 return -1;
82}
83EXPORT_SYMBOL_GPL(nft_reject_dump);
84
85static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
86 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
87 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
88 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
89 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
90};
91
92int nft_reject_icmp_code(u8 code)
93{
94 if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
95 return ICMP_NET_UNREACH;
96
97 return icmp_code_v4[code];
98}
99
100EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
101
102
103static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
104 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
105 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
106 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
107 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
108};
109
110int nft_reject_icmpv6_code(u8 code)
111{
112 if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
113 return ICMPV6_NOROUTE;
114
115 return icmp_code_v6[code];
116}
117
118EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
119
120MODULE_LICENSE("GPL");
121MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");