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 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 }
68 EXPORT_SYMBOL_GPL(nft_reject_init);
69
nft_reject_dump(struct sk_buff * skb,const struct nft_expr * expr)70 int 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
88 nla_put_failure:
89 return -1;
90 }
91 EXPORT_SYMBOL_GPL(nft_reject_dump);
92
93 static 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
nft_reject_icmp_code(u8 code)100 int nft_reject_icmp_code(u8 code)
101 {
102 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
103
104 return icmp_code_v4[code];
105 }
106
107 EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
108
109
110 static 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
nft_reject_icmpv6_code(u8 code)117 int nft_reject_icmpv6_code(u8 code)
118 {
119 BUG_ON(code > NFT_REJECT_ICMPX_MAX);
120
121 return icmp_code_v6[code];
122 }
123
124 EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
125
126 MODULE_LICENSE("GPL");
127 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
128