Commit | Line | Data |
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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
96518518 | 2 | /* |
ef1f7df9 | 3 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
bee11dc7 | 4 | * Copyright (c) 2013 Eric Leblond <eric@regit.org> |
96518518 | 5 | * |
96518518 PM |
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> | |
cc4723ca | 16 | #include <net/netfilter/nft_reject.h> |
51b0a5d8 PNA |
17 | #include <linux/icmp.h> |
18 | #include <linux/icmpv6.h> | |
bee11dc7 | 19 | |
cc4723ca | 20 | const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = { |
96518518 PM |
21 | [NFTA_REJECT_TYPE] = { .type = NLA_U32 }, |
22 | [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 }, | |
23 | }; | |
cc4723ca | 24 | EXPORT_SYMBOL_GPL(nft_reject_policy); |
96518518 | 25 | |
89e1f6d2 LZ |
26 | int 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) | | |
f53b9b0b LGL |
33 | (1 << NF_INET_LOCAL_OUT) | |
34 | (1 << NF_INET_PRE_ROUTING)); | |
89e1f6d2 LZ |
35 | } |
36 | EXPORT_SYMBOL_GPL(nft_reject_validate); | |
37 | ||
cc4723ca PM |
38 | int nft_reject_init(const struct nft_ctx *ctx, |
39 | const struct nft_expr *expr, | |
40 | const struct nlattr * const tb[]) | |
96518518 PM |
41 | { |
42 | struct nft_reject *priv = nft_expr_priv(expr); | |
312ca575 | 43 | int icmp_code; |
96518518 PM |
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: | |
312ca575 | 51 | case NFT_REJECT_ICMPX_UNREACH: |
96518518 PM |
52 | if (tb[NFTA_REJECT_ICMP_CODE] == NULL) |
53 | return -EINVAL; | |
312ca575 JGG |
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; | |
96518518 PM |
62 | case NFT_REJECT_TCP_RST: |
63 | break; | |
64 | default: | |
65 | return -EINVAL; | |
66 | } | |
67 | ||
68 | return 0; | |
69 | } | |
cc4723ca | 70 | EXPORT_SYMBOL_GPL(nft_reject_init); |
96518518 | 71 | |
cc4723ca | 72 | int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr) |
96518518 PM |
73 | { |
74 | const struct nft_reject *priv = nft_expr_priv(expr); | |
75 | ||
bee11dc7 | 76 | if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type))) |
96518518 PM |
77 | goto nla_put_failure; |
78 | ||
79 | switch (priv->type) { | |
80 | case NFT_REJECT_ICMP_UNREACH: | |
312ca575 | 81 | case NFT_REJECT_ICMPX_UNREACH: |
96518518 PM |
82 | if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code)) |
83 | goto nla_put_failure; | |
84 | break; | |
129d23a5 DM |
85 | default: |
86 | break; | |
96518518 PM |
87 | } |
88 | ||
89 | return 0; | |
90 | ||
91 | nla_put_failure: | |
92 | return -1; | |
93 | } | |
cc4723ca | 94 | EXPORT_SYMBOL_GPL(nft_reject_dump); |
96518518 | 95 | |
f0d1f04f | 96 | static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = { |
51b0a5d8 PNA |
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 | ||
103 | int nft_reject_icmp_code(u8 code) | |
104 | { | |
fa5950e4 FW |
105 | if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX)) |
106 | return ICMP_NET_UNREACH; | |
51b0a5d8 PNA |
107 | |
108 | return icmp_code_v4[code]; | |
109 | } | |
110 | ||
111 | EXPORT_SYMBOL_GPL(nft_reject_icmp_code); | |
112 | ||
113 | ||
f0d1f04f | 114 | static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = { |
51b0a5d8 PNA |
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 | ||
121 | int nft_reject_icmpv6_code(u8 code) | |
122 | { | |
fa5950e4 FW |
123 | if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX)) |
124 | return ICMPV6_NOROUTE; | |
51b0a5d8 PNA |
125 | |
126 | return icmp_code_v6[code]; | |
127 | } | |
128 | ||
129 | EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code); | |
130 | ||
96518518 PM |
131 | MODULE_LICENSE("GPL"); |
132 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
4cacc395 | 133 | MODULE_DESCRIPTION("Netfilter x_tables over nftables module"); |