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
nft_reject_validate(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nft_data ** data)29 int 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 }
38 EXPORT_SYMBOL_GPL(nft_reject_validate);
39
nft_reject_init(const struct nft_ctx * ctx,const struct nft_expr * expr,const struct nlattr * const tb[])40 int 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
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 }
63 EXPORT_SYMBOL_GPL(nft_reject_init);
64
nft_reject_dump(struct sk_buff * skb,const struct nft_expr * expr)65 int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
66 {
67 const struct nft_reject *priv = nft_expr_priv(expr);
68
69 if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
70 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;
77 default:
78 break;
79 }
80
81 return 0;
82
83 nla_put_failure:
84 return -1;
85 }
86 EXPORT_SYMBOL_GPL(nft_reject_dump);
87
88 static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
89 [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
nft_reject_icmp_code(u8 code)95 int nft_reject_icmp_code(u8 code)
96 {
97 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
98
99 return icmp_code_v4[code];
100 }
101
102 EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
103
104
105 static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
106 [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
nft_reject_icmpv6_code(u8 code)112 int nft_reject_icmpv6_code(u8 code)
113 {
114 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
115
116 return icmp_code_v6[code];
117 }
118
119 EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
120
121 MODULE_LICENSE("GPL");
122 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
123
