nuttx/net/netdev/netdev_lladdrsize.c

/****************************************************************************
 * net/netdev/netdev_lladdrsize.c
 *
 *   Copyright (C) 2017 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <nuttx/config.h>

#include <string.h>
#include <assert.h>
#include <errno.h>

#include <net/if.h>

#include <nuttx/net/net.h>
#include <nuttx/net/netdev.h>
#include <nuttx/net/sixlowpan.h>

#include "netdev/netdev.h"

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: netdev_pktradio_addrlen
 *
 * Description:
 *   Returns the size of the node address associated with a packet radio.
 *   This is probably CONFIG_PKTRADIO_ADDRLEN but we cannot be sure in the
 *   case that there ar mutiple packet radios.  In that case, we have to
 *   query the radio for its address length.
 *
 * Parameters:
 *   dev - A reference to the device of interest
 *
 * Returned Value:
 *   The size of the MAC address associated with this radio
 *
 ****************************************************************************/

#if defined(CONFIG_NET_6LOWPAN) && defined(CONFIG_WIRELESS_PKTRADIO)
static inline int netdev_pktradio_addrlen(FAR struct net_driver_s *dev)
{
  FAR struct radio_driver_s *radio = (FAR struct radio_driver_s *)dev;
  struct sixlowpan_properties_s properties;
  int ret;

  DEBUGASSERT(radio != NULL && radio->r_properties != NULL);
  ret = radio->r_properties(radio, &properties);
  if (ret < 0)
    {
      return ret;
    }

  return properties.sp_addrlen;
}
#endif

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: netdev_dev_lladdrsize
 *
 * Description:
 *   Returns the size of the MAC address associated with a network device.
 *
 * Parameters:
 *   dev - A reference to the device of interest
 *
 * Returned Value:
 *   The size of the MAC address associated with this device
 *
 ****************************************************************************/

int netdev_dev_lladdrsize(FAR struct net_driver_s *dev)
{
  DEBUGASSERT(dev != NULL);

  /* Get the length of the address for this link layer type */

  switch (dev->d_lltype)
    {
#ifdef CONFIG_NET_ETHERNET
      case NET_LL_ETHERNET:
        {
          /* Size of the Ethernet MAC address */

          return IFHWADDRLEN;
        }
#endif

#ifdef CONFIG_NET_6LOWPAN
#ifdef CONFIG_WIRELESS_IEEE802154
      case NET_LL_IEEE802154:
        {
          /* 6LoWPAN can be configured to use either extended or short
           * addressing.
           */

#ifdef CONFIG_NET_6LOWPAN_EXTENDEDADDR
          return NET_6LOWPAN_EADDRSIZE;
#else
          return NET_6LOWPAN_SADDRSIZE;
#endif
        }

#endif /* CONFIG_WIRELESS_IEEE802154 */

#ifdef CONFIG_WIRELESS_PKTRADIO
      case NET_LL_PKTRADIO:
        {
           /* Return the size of the packet radio address */

           return netdev_pktradio_addrlen(dev);
        }
#endif /* CONFIG_WIRELESS_PKTRADIO */
#endif /* CONFIG_NET_6LOWPAN */

       default:
        {
          /* The link layer type associated has no address */

          return 0;
        }
    }
}