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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 (1 << NF_INET_PRE_ROUTING));
35}
36EXPORT_SYMBOL_GPL(nft_reject_validate);
37
38int nft_reject_init(const struct nft_ctx *ctx,
39 const struct nft_expr *expr,
40 const struct nlattr * const tb[])
41{
42 struct nft_reject *priv = nft_expr_priv(expr);
43 int icmp_code;
44
45 if (tb[NFTA_REJECT_TYPE] == NULL)
46 return -EINVAL;
47
48 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
49 switch (priv->type) {
50 case NFT_REJECT_ICMP_UNREACH:
51 case NFT_REJECT_ICMPX_UNREACH:
52 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
53 return -EINVAL;
54
55 icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
56 if (priv->type == NFT_REJECT_ICMPX_UNREACH &&
57 icmp_code > NFT_REJECT_ICMPX_MAX)
58 return -EINVAL;
59
60 priv->icmp_code = icmp_code;
61 break;
62 case NFT_REJECT_TCP_RST:
63 break;
64 default:
65 return -EINVAL;
66 }
67
68 return 0;
69}
70EXPORT_SYMBOL_GPL(nft_reject_init);
71
72int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
73{
74 const struct nft_reject *priv = nft_expr_priv(expr);
75
76 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
77 goto nla_put_failure;
78
79 switch (priv->type) {
80 case NFT_REJECT_ICMP_UNREACH:
81 case NFT_REJECT_ICMPX_UNREACH:
82 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
83 goto nla_put_failure;
84 break;
85 default:
86 break;
87 }
88
89 return 0;
90
91nla_put_failure:
92 return -1;
93}
94EXPORT_SYMBOL_GPL(nft_reject_dump);
95
96static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
97 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
98 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
99 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
100 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
101};
102
103int nft_reject_icmp_code(u8 code)
104{
105 if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
106 return ICMP_NET_UNREACH;
107
108 return icmp_code_v4[code];
109}
110
111EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
112
113
114static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
115 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
116 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
117 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
118 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
119};
120
121int nft_reject_icmpv6_code(u8 code)
122{
123 if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
124 return ICMPV6_NOROUTE;
125
126 return icmp_code_v6[code];
127}
128
129EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
130
131MODULE_LICENSE("GPL");
132MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
133MODULE_DESCRIPTION("Netfilter x_tables over nftables module");
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_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
40int nft_reject_init(const struct nft_ctx *ctx,
41 const struct nft_expr *expr,
42 const struct nlattr * const tb[])
43{
44 struct nft_reject *priv = nft_expr_priv(expr);
45 int err;
46
47 err = nft_reject_validate(ctx, expr, NULL);
48 if (err < 0)
49 return err;
50
51 if (tb[NFTA_REJECT_TYPE] == NULL)
52 return -EINVAL;
53
54 priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
55 switch (priv->type) {
56 case NFT_REJECT_ICMP_UNREACH:
57 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
58 return -EINVAL;
59 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
60 case NFT_REJECT_TCP_RST:
61 break;
62 default:
63 return -EINVAL;
64 }
65
66 return 0;
67}
68EXPORT_SYMBOL_GPL(nft_reject_init);
69
70int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
71{
72 const struct nft_reject *priv = nft_expr_priv(expr);
73
74 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
75 goto nla_put_failure;
76
77 switch (priv->type) {
78 case NFT_REJECT_ICMP_UNREACH:
79 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
80 goto nla_put_failure;
81 break;
82 default:
83 break;
84 }
85
86 return 0;
87
88nla_put_failure:
89 return -1;
90}
91EXPORT_SYMBOL_GPL(nft_reject_dump);
92
93static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
94 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH,
95 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH,
96 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH,
97 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED,
98};
99
100int nft_reject_icmp_code(u8 code)
101{
102 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
103
104 return icmp_code_v4[code];
105}
106
107EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
108
109
110static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
111 [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE,
112 [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH,
113 [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH,
114 [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED,
115};
116
117int nft_reject_icmpv6_code(u8 code)
118{
119 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
120
121 return icmp_code_v6[code];
122}
123
124EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
125
126MODULE_LICENSE("GPL");
127MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");