LXR linux/net/netfilter/nft

   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
  19const struct nla_policy nft_masq_policy[NFTA_MASQ_MAX + 1] = {
  20        [NFTA_MASQ_FLAGS]       = { .type = NLA_U32 },
  21};
  22EXPORT_SYMBOL_GPL(nft_masq_policy);
  23
  24int nft_masq_validate(const struct nft_ctx *ctx,
  25                      const struct nft_expr *expr,
  26                      const struct nft_data **data)
  27{
  28        int err;
  29
  30        err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
  31        if (err < 0)
  32                return err;
  33
  34        return nft_chain_validate_hooks(ctx->chain,
  35                                        (1 << NF_INET_POST_ROUTING));
  36}
  37EXPORT_SYMBOL_GPL(nft_masq_validate);
  38
  39int nft_masq_init(const struct nft_ctx *ctx,
  40                  const struct nft_expr *expr,
  41                  const struct nlattr * const tb[])
  42{
  43        struct nft_masq *priv = nft_expr_priv(expr);
  44        int err;
  45
  46        err = nft_masq_validate(ctx, expr, NULL);
  47        if (err)
  48                return err;
  49
  50        if (tb[NFTA_MASQ_FLAGS] == NULL)
  51                return 0;
  52
  53        priv->flags = ntohl(nla_get_be32(tb[NFTA_MASQ_FLAGS]));
  54        if (priv->flags & ~NF_NAT_RANGE_MASK)
  55                return -EINVAL;
  56
  57        return 0;
  58}
  59EXPORT_SYMBOL_GPL(nft_masq_init);
  60
  61int nft_masq_dump(struct sk_buff *skb, const struct nft_expr *expr)
  62{
  63        const struct nft_masq *priv = nft_expr_priv(expr);
  64
  65        if (priv->flags == 0)
  66                return 0;
  67
  68        if (nla_put_be32(skb, NFTA_MASQ_FLAGS, htonl(priv->flags)))
  69                goto nla_put_failure;
  70
  71        return 0;
  72
  73nla_put_failure:
  74        return -1;
  75}
  76EXPORT_SYMBOL_GPL(nft_masq_dump);
  77
  78MODULE_LICENSE("GPL");
  79MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>");
  80