Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1 | /* |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 2 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
Eric Leblond | bee11dc | 2013-12-29 12:28:14 +0100 | [diff] [blame] | 3 | * Copyright (c) 2013 Eric Leblond <eric@regit.org> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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> |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 19 | #include <net/netfilter/nft_reject.h> |
Pablo Neira Ayuso | 51b0a5d | 2014-09-26 14:35:14 +0200 | [diff] [blame] | 20 | #include <linux/icmp.h> |
| 21 | #include <linux/icmpv6.h> |
Eric Leblond | bee11dc | 2013-12-29 12:28:14 +0100 | [diff] [blame] | 22 | |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 23 | const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 24 | [NFTA_REJECT_TYPE] = { .type = NLA_U32 }, |
| 25 | [NFTA_REJECT_ICMP_CODE] = { .type = NLA_U8 }, |
| 26 | }; |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 27 | EXPORT_SYMBOL_GPL(nft_reject_policy); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 28 | |
Liping Zhang | 89e1f6d | 2016-08-22 01:02:18 +0800 | [diff] [blame] | 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 | |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 40 | int nft_reject_init(const struct nft_ctx *ctx, |
| 41 | const struct nft_expr *expr, |
| 42 | const struct nlattr * const tb[]) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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 | } |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 63 | EXPORT_SYMBOL_GPL(nft_reject_init); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 64 | |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 65 | int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 66 | { |
| 67 | const struct nft_reject *priv = nft_expr_priv(expr); |
| 68 | |
Eric Leblond | bee11dc | 2013-12-29 12:28:14 +0100 | [diff] [blame] | 69 | if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type))) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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; |
David S. Miller | 129d23a | 2015-04-27 13:20:34 -0400 | [diff] [blame] | 77 | default: |
| 78 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | return 0; |
| 82 | |
| 83 | nla_put_failure: |
| 84 | return -1; |
| 85 | } |
Patrick McHardy | cc4723ca | 2014-02-05 15:03:38 +0000 | [diff] [blame] | 86 | EXPORT_SYMBOL_GPL(nft_reject_dump); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 87 | |
Pablo Neira Ayuso | f0d1f04 | 2014-10-07 19:02:11 +0200 | [diff] [blame] | 88 | static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = { |
Pablo Neira Ayuso | 51b0a5d | 2014-09-26 14:35:14 +0200 | [diff] [blame] | 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 | |
| 95 | int nft_reject_icmp_code(u8 code) |
| 96 | { |
Pablo Neira Ayuso | f0d1f04 | 2014-10-07 19:02:11 +0200 | [diff] [blame] | 97 | BUG_ON(code > NFT_REJECT_ICMPX_MAX); |
Pablo Neira Ayuso | 51b0a5d | 2014-09-26 14:35:14 +0200 | [diff] [blame] | 98 | |
| 99 | return icmp_code_v4[code]; |
| 100 | } |
| 101 | |
| 102 | EXPORT_SYMBOL_GPL(nft_reject_icmp_code); |
| 103 | |
| 104 | |
Pablo Neira Ayuso | f0d1f04 | 2014-10-07 19:02:11 +0200 | [diff] [blame] | 105 | static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = { |
Pablo Neira Ayuso | 51b0a5d | 2014-09-26 14:35:14 +0200 | [diff] [blame] | 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 | |
| 112 | int nft_reject_icmpv6_code(u8 code) |
| 113 | { |
Pablo Neira Ayuso | f0d1f04 | 2014-10-07 19:02:11 +0200 | [diff] [blame] | 114 | BUG_ON(code > NFT_REJECT_ICMPX_MAX); |
Pablo Neira Ayuso | 51b0a5d | 2014-09-26 14:35:14 +0200 | [diff] [blame] | 115 | |
| 116 | return icmp_code_v6[code]; |
| 117 | } |
| 118 | |
| 119 | EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code); |
| 120 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 121 | MODULE_LICENSE("GPL"); |
| 122 | MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |