tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>");