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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); | |
43 | ||
44 | if (tb[NFTA_REJECT_TYPE] == NULL) | |
45 | return -EINVAL; | |
46 | ||
47 | priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE])); | |
48 | switch (priv->type) { | |
49 | case NFT_REJECT_ICMP_UNREACH: | |
50 | if (tb[NFTA_REJECT_ICMP_CODE] == NULL) | |
51 | return -EINVAL; | |
52 | priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]); | |
53 | case NFT_REJECT_TCP_RST: | |
54 | break; | |
55 | default: | |
56 | return -EINVAL; | |
57 | } | |
58 | ||
59 | return 0; | |
60 | } | |
cc4723ca | 61 | EXPORT_SYMBOL_GPL(nft_reject_init); |
96518518 | 62 | |
cc4723ca | 63 | int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr) |
96518518 PM |
64 | { |
65 | const struct nft_reject *priv = nft_expr_priv(expr); | |
66 | ||
bee11dc7 | 67 | if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type))) |
96518518 PM |
68 | goto nla_put_failure; |
69 | ||
70 | switch (priv->type) { | |
71 | case NFT_REJECT_ICMP_UNREACH: | |
72 | if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code)) | |
73 | goto nla_put_failure; | |
74 | break; | |
129d23a5 DM |
75 | default: |
76 | break; | |
96518518 PM |
77 | } |
78 | ||
79 | return 0; | |
80 | ||
81 | nla_put_failure: | |
82 | return -1; | |
83 | } | |
cc4723ca | 84 | EXPORT_SYMBOL_GPL(nft_reject_dump); |
96518518 | 85 | |
f0d1f04f | 86 | static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = { |
51b0a5d8 PNA |
87 | [NFT_REJECT_ICMPX_NO_ROUTE] = ICMP_NET_UNREACH, |
88 | [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMP_PORT_UNREACH, | |
89 | [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMP_HOST_UNREACH, | |
90 | [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMP_PKT_FILTERED, | |
91 | }; | |
92 | ||
93 | int nft_reject_icmp_code(u8 code) | |
94 | { | |
fa5950e4 FW |
95 | if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX)) |
96 | return ICMP_NET_UNREACH; | |
51b0a5d8 PNA |
97 | |
98 | return icmp_code_v4[code]; | |
99 | } | |
100 | ||
101 | EXPORT_SYMBOL_GPL(nft_reject_icmp_code); | |
102 | ||
103 | ||
f0d1f04f | 104 | static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = { |
51b0a5d8 PNA |
105 | [NFT_REJECT_ICMPX_NO_ROUTE] = ICMPV6_NOROUTE, |
106 | [NFT_REJECT_ICMPX_PORT_UNREACH] = ICMPV6_PORT_UNREACH, | |
107 | [NFT_REJECT_ICMPX_HOST_UNREACH] = ICMPV6_ADDR_UNREACH, | |
108 | [NFT_REJECT_ICMPX_ADMIN_PROHIBITED] = ICMPV6_ADM_PROHIBITED, | |
109 | }; | |
110 | ||
111 | int nft_reject_icmpv6_code(u8 code) | |
112 | { | |
fa5950e4 FW |
113 | if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX)) |
114 | return ICMPV6_NOROUTE; | |
51b0a5d8 PNA |
115 | |
116 | return icmp_code_v6[code]; | |
117 | } | |
118 | ||
119 | EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code); | |
120 | ||
96518518 PM |
121 | MODULE_LICENSE("GPL"); |
122 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); | |
4cacc395 | 123 | MODULE_DESCRIPTION("Netfilter x_tables over nftables module"); |