net/netfilter/nft_reject.c

   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
  21 const struct nla_policy nft_reject_policy[NFTA_REJECT_MAX + 1] = {
  22         [NFTA_REJECT_TYPE]              = { .type = NLA_U32 },
  23         [NFTA_REJECT_ICMP_CODE]         = { .type = NLA_U8 },
  24 };
  25 EXPORT_SYMBOL_GPL(nft_reject_policy);
  26
  27 int nft_reject_init(const struct nft_ctx *ctx,
  28                     const struct nft_expr *expr,
  29                     const struct nlattr * const tb[])
  30 {
  31         struct nft_reject *priv = nft_expr_priv(expr);
  32
  33         if (tb[NFTA_REJECT_TYPE] == NULL)
  34                 return -EINVAL;
  35
  36         priv->type = ntohl(nla_get_be32(tb[NFTA_REJECT_TYPE]));
  37         switch (priv->type) {
  38         case NFT_REJECT_ICMP_UNREACH:
  39                 if (tb[NFTA_REJECT_ICMP_CODE] == NULL)
  40                         return -EINVAL;
  41                 priv->icmp_code = nla_get_u8(tb[NFTA_REJECT_ICMP_CODE]);
  42         case NFT_REJECT_TCP_RST:
  43                 break;
  44         default:
  45                 return -EINVAL;
  46         }
  47
  48         return 0;
  49 }
  50 EXPORT_SYMBOL_GPL(nft_reject_init);
  51
  52 int nft_reject_dump(struct sk_buff *skb, const struct nft_expr *expr)
  53 {
  54         const struct nft_reject *priv = nft_expr_priv(expr);
  55
  56         if (nla_put_be32(skb, NFTA_REJECT_TYPE, htonl(priv->type)))
  57                 goto nla_put_failure;
  58
  59         switch (priv->type) {
  60         case NFT_REJECT_ICMP_UNREACH:
  61                 if (nla_put_u8(skb, NFTA_REJECT_ICMP_CODE, priv->icmp_code))
  62                         goto nla_put_failure;
  63                 break;
  64         }
  65
  66         return 0;
  67
  68 nla_put_failure:
  69         return -1;
  70 }
  71 EXPORT_SYMBOL_GPL(nft_reject_dump);
  72
  73 MODULE_LICENSE("GPL");
  74 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");