net/netfilter/nft_masq.c

   1 /*
   2  * Copyright (c) 2014 Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   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/nf_nat.h>
  17 #include <net/netfilter/nft_masq.h>
  18
  19 const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
  20         [NFTA_MASQ_FLAGS]       = { .type = NLA_U32 },
  21 };
  22 EXPORT_SYMBOL_GPL(nft_masq_policy);
  23
  24 int nft_masq_init(const struct nft_ctx *ctx,
  25                   const struct nft_expr *expr,
  26                   const struct nlattr * const tb[])
  27 {
  28         struct nft_masq *priv = nft_expr_priv(expr);
  29         int err;
  30
  31         err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
  32         if (err < 0)
  33                 return err;
  34
  35         if (tb[NFTA_MASQ_FLAGS] == NULL)
  36                 return 0;
  37
  38         priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS]));
  39         if (priv->flags & ~NF_NAT_RANGE_MASK)
  40                 return -EINVAL;
  41
  42         return 0;
  43 }
  44 EXPORT_SYMBOL_GPL(nft_masq_init);
  45
  46 int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
  47 {
  48         const struct nft_masq *priv = nft_expr_priv(expr);
  49
  50         if (priv->flags == 0)
  51                 return 0;
  52
  53         if (nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags)))
  54                 goto nla_put_failure;
  55
  56         return 0;
  57
  58 nla_put_failure:
  59         return -1;
  60 }
  61 EXPORT_SYMBOL_GPL(nft_masq_dump);
  62
  63 int nft_masq_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
  64                       const struct nft_data **data)
  65 {
  66         return nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
  67 }
  68 EXPORT_SYMBOL_GPL(nft_masq_validate);
  69
  70 MODULE_LICENSE("GPL");
  71 MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");