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/*
 This file is part of GNUnet
 (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 Christian Grothoff (and other contributing authors)

 GNUnet is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published
 by the Free Software Foundation; either version 3, or (at your
 option) any later version.

 GNUnet is distributed in the hope that it will be useful, but
 WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GNUnet; see the file COPYING.  If not, write to the
 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 Boston, MA 02111-1307, USA.
 */

/**
 * @file transport/plugin_transport_wlan.h
 * @brief header for transport plugin and the helper for wlan
 * @author David Brodski
 */

#ifndef PLUGIN_TRANSPORT_WLAN
#define PLUGIN_TRANSPORT_WLAN

#include <stdint.h>
#include "gnunet_common.h"

struct MacAddress
{
  u_int8_t mac[6];
};

struct Wlan_Helper_Control_Message
{
  struct GNUNET_MessageHeader hdr;
  struct MacAddress mac;
};


/**
 * Header for messages which need fragmentation
 */
struct WlanHeader
{

  struct GNUNET_MessageHeader header;

  /**
   * checksum/error correction
   */
  uint32_t crc GNUNET_PACKED;

  /**
   * To whom are we talking to (set to our identity
   * if we are still waiting for the welcome message)
   */
  struct GNUNET_PeerIdentity target;

  /**
   *  Where the packet came from
   */
  struct GNUNET_PeerIdentity source;

// followed by payload

};

/* Wlan IEEE80211 header default */
//Informations (in German) http://www.umtslink.at/content/WLAN_macheader-196.html
static const uint8_t u8aIeeeHeader[] =
  { 0x08, 0x01, // Frame Control 0x08= 00001000 -> | b1,2 = 0 -> Version 0;
      //      b3,4 = 10 -> Data; b5-8 = 0 -> Normal Data
      //	0x01 = 00000001 -> | b1 = 1 to DS; b2 = 0 not from DS;
      0x00, 0x00, // Duration/ID
      0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // mac1 - in this case receiver
      0x13, 0x22, 0x33, 0x44, 0x55, 0x66, // mac2 - in this case sender
      0x13, 0x22, 0x33, 0x44, 0x55, 0x66, // mac3 - in this case bssid
      0x10, 0x86, //Sequence Control
    };

// gnunet bssid
static const struct MacAddress mac_bssid =
  {
    { 0x13, 0x22, 0x33, 0x44, 0x55, 0x66 } };

// broadcast mac
static const struct MacAddress bc_all_mac =
  {
    { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF } };

/* this is the template radiotap header we send packets out with */

static const uint8_t u8aRadiotapHeader[] =
  { 0x00, 0x00, // <-- radiotap version
      0x19, 0x00, // <- radiotap header length
      0x6f, 0x08, 0x00, 0x00, // <-- bitmap
      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // <-- timestamp
      0x00, // <-- flags (Offset +0x10)
      0x6c, // <-- rate (0ffset +0x11)
      0x71, 0x09, 0xc0, 0x00, // <-- channel
      0xde, // <-- antsignal
      0x00, // <-- antnoise
      0x01, // <-- antenna
    };

struct Radiotap_Send
{
  /**
   * wlan send rate
   */
  uint8_t rate;

  /**
   * antenna
   */
  uint8_t antenna;

  /**
   * Transmit power expressed as unitless distance from max power set at factory calibration.
   * 0 is max power. Monotonically nondecreasing with lower power levels.
   */

  uint16_t tx_power;
};

// bit field defines for ri_present

#define has_noise 1
#define has_power 2
#define has_channel 4

/**
 * struct to represent infos gathered form the radiotap fields
 */

struct Radiotap_rx
{
  uint32_t ri_present;
  uint64_t ri_mactime;
  int32_t ri_power;
  int32_t ri_noise;
  uint32_t ri_channel;
  uint32_t ri_freq;
  uint32_t ri_rate;
  uint32_t ri_antenna;
};

/**
 * Radiotap Header
 */
struct RadiotapHeader
{
  /**
   * radiotap version
   */
  u_int8_t version;

  u_int8_t pad_version;

  /**
   * radiotap header length
   */
  uint16_t length GNUNET_PACKED;

  /**
   * bitmap, fields present
   */
  uint32_t bitmap GNUNET_PACKED;

  /**
   * timestamp
   */
  uint64_t timestamp GNUNET_PACKED;

  /**
   * radiotap flags
   */
  uint8_t flags;

  /**
   * wlan send rate
   */
  uint8_t rate;

  // FIXME: unaligned here, is this OK?
  /**
   * Wlan channel
   */
  uint32_t channel GNUNET_PACKED;

  /**
   * antsignal
   */
  uint8_t antsignal;

  /**
   * antnoise
   */
  uint8_t antnoise;

  /**
   * antenna
   */
  uint8_t antenna;
};

#endif