LXR linux/net/netfilter/nft

   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_init(const struct nft_ctx *ctx,
  30                    const struct nft_expr *expr,
  31                    const struct nlattr * const tb[])
  32{
  33        struct nft_reject *priv = nft_expr_priv(expr);
  34
  35        if (tb[NFTA_REJECT_TYPE] == NULL)
  36                return -EINVAL;
  37
  38        priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
  39        switch (priv->type) {
  40        case NFT_REJECT_ICMP_UNREACH:
  41                if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
  42                        return -EINVAL;
  43                priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
  44        case NFT_REJECT_TCP_RST:
  45                break;
  46        default:
  47                return -EINVAL;
  48        }
  49
  50        return 0;
  51}
  52EXPORT_SYMBOL_GPL(nft_reject_init);
  53
  54int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
  55{
  56        const struct nft_reject *priv = nft_expr_priv(expr);
  57
  58        if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
  59                goto nla_put_failure;
  60
  61        switch (priv->type) {
  62        case NFT_REJECT_ICMP_UNREACH:
  63                if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
  64                        goto nla_put_failure;
  65                break;
  66        default:
  67                break;
  68        }
  69
  70        return 0;
  71
  72nla_put_failure:
  73        return -1;
  74}
  75EXPORT_SYMBOL_GPL(nft_reject_dump);
  76
  77static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
  78        [NFT_REJECT_ICMPX_NO_ROUTE]             = ICMP_NET_UNREACH,
  79        [NFT_REJECT_ICMPX_PORT_UNREACH]         = ICMP_PORT_UNREACH,
  80        [NFT_REJECT_ICMPX_HOST_UNREACH]         = ICMP_HOST_UNREACH,
  81        [NFT_REJECT_ICMPX_ADMIN_PROHIBITED]     = ICMP_PKT_FILTERED,
  82};
  83
  84int nft_reject_icmp_code(u8 code)
  85{
  86        BUG_ON(code > NFT_REJECT_ICMPX_MAX);
  87
  88        return icmp_code_v4[code];
  89}
  90
  91EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
  92
  93
  94static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
  95        [NFT_REJECT_ICMPX_NO_ROUTE]             = ICMPV6_NOROUTE,
  96        [NFT_REJECT_ICMPX_PORT_UNREACH]         = ICMPV6_PORT_UNREACH,
  97        [NFT_REJECT_ICMPX_HOST_UNREACH]         = ICMPV6_ADDR_UNREACH,
  98        [NFT_REJECT_ICMPX_ADMIN_PROHIBITED]     = ICMPV6_ADM_PROHIBITED,
  99};
 100
 101int nft_reject_icmpv6_code(u8 code)
 102{
 103        BUG_ON(code > NFT_REJECT_ICMPX_MAX);
 104
 105        return icmp_code_v6[code];
 106}
 107
 108EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
 109
 110MODULE_LICENSE("GPL");
 111MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 112