LXR linux/net/netfilter/nft

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
   4 * Copyright (c) 2013 Eric Leblond <eric@regit.org>
   5 *
   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>
  16#include <net/netfilter/nft_reject.h>
  17#include <linux/icmp.h>
  18#include <linux/icmpv6.h>
  19
  20const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
  21        [NFTA_REJECT_TYPE]              = { .type = NLA_U32 },
  22        [NFTA_REJECT_ICMP_CODE]         = { .type = NLA_U8 },
  23};
  24EXPORT_SYMBOL_GPL(nft_reject_policy);
  25
  26int 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) |
  33                                        (1 << NF_INET_LOCAL_OUT));
  34}
  35EXPORT_SYMBOL_GPL(nft_reject_validate);
  36
  37int nft_reject_init(const struct nft_ctx *ctx,
  38                    const struct nft_expr *expr,
  39                    const struct nlattr * const tb[])
  40{
  41        struct nft_reject *priv = nft_expr_priv(expr);
  42
  43        if (tb[NFTA_REJECT_TYPE] == NULL)
  44                return -EINVAL;
  45
  46        priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
  47        switch (priv->type) {
  48        case NFT_REJECT_ICMP_UNREACH:
  49                if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
  50                        return -EINVAL;
  51                priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
  52        case NFT_REJECT_TCP_RST:
  53                break;
  54        default:
  55                return -EINVAL;
  56        }
  57
  58        return 0;
  59}
  60EXPORT_SYMBOL_GPL(nft_reject_init);
  61
  62int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
  63{
  64        const struct nft_reject *priv = nft_expr_priv(expr);
  65
  66        if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
  67                goto nla_put_failure;
  68
  69        switch (priv->type) {
  70        case NFT_REJECT_ICMP_UNREACH:
  71                if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
  72                        goto nla_put_failure;
  73                break;
  74        default:
  75                break;
  76        }
  77
  78        return 0;
  79
  80nla_put_failure:
  81        return -1;
  82}
  83EXPORT_SYMBOL_GPL(nft_reject_dump);
  84
  85static u8 icmp_code_v4[NFT_REJECT_ICMPX_MAX + 1] = {
  86        [NFT_REJECT_ICMPX_NO_ROUTE]             = ICMP_NET_UNREACH,
  87        [NFT_REJECT_ICMPX_PORT_UNREACH]         = ICMP_PORT_UNREACH,
  88        [NFT_REJECT_ICMPX_HOST_UNREACH]         = ICMP_HOST_UNREACH,
  89        [NFT_REJECT_ICMPX_ADMIN_PROHIBITED]     = ICMP_PKT_FILTERED,
  90};
  91
  92int nft_reject_icmp_code(u8 code)
  93{
  94        if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
  95                return ICMP_NET_UNREACH;
  96
  97        return icmp_code_v4[code];
  98}
  99
 100EXPORT_SYMBOL_GPL(nft_reject_icmp_code);
 101
 102
 103static u8 icmp_code_v6[NFT_REJECT_ICMPX_MAX + 1] = {
 104        [NFT_REJECT_ICMPX_NO_ROUTE]             = ICMPV6_NOROUTE,
 105        [NFT_REJECT_ICMPX_PORT_UNREACH]         = ICMPV6_PORT_UNREACH,
 106        [NFT_REJECT_ICMPX_HOST_UNREACH]         = ICMPV6_ADDR_UNREACH,
 107        [NFT_REJECT_ICMPX_ADMIN_PROHIBITED]     = ICMPV6_ADM_PROHIBITED,
 108};
 109
 110int nft_reject_icmpv6_code(u8 code)
 111{
 112        if (WARN_ON_ONCE(code > NFT_REJECT_ICMPX_MAX))
 113                return ICMPV6_NOROUTE;
 114
 115        return icmp_code_v6[code];
 116}
 117
 118EXPORT_SYMBOL_GPL(nft_reject_icmpv6_code);
 119
 120MODULE_LICENSE("GPL");
 121MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
 122