150 lines
5.0 KiB
C
150 lines
5.0 KiB
C
/****************************************************************************
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* wireless/ieee802154/mac802154_get_mhrlen.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Copyright (C) 2017 Verge Inc. All rights reserved.
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*
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* Author: Gregory Nutt <gnutt@nuttx.org>
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* Author: Anthony Merlino <anthony@vergeaero.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <string.h>
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#include "mac802154.h"
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#include "mac802154_internal.h"
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#include <nuttx/wireless/ieee802154/ieee802154_mac.h>
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* Map between ieee802154_addrmode_e enum and actual address length */
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static const uint8_t mac802154_addr_length[4] =
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{
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0, 0, 2, 8
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};
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: mac802154_get_mhrlen
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*
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* Description:
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* Calculate the MAC header length given the frame meta-data.
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*
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****************************************************************************/
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int mac802154_get_mhrlen(MACHANDLE mac,
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FAR const struct ieee802154_frame_meta_s *meta)
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{
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FAR struct ieee802154_privmac_s *priv =
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(FAR struct ieee802154_privmac_s *)mac;
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int ret = 3; /* Always frame control (2 bytes) and seq. num (1 byte) */
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/* Check to make sure both the dest address and the source address are not
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* set to NONE
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*/
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if (meta->destaddr.mode == IEEE802154_ADDRMODE_NONE &&
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meta->srcmode == IEEE802154_ADDRMODE_NONE)
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{
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return -EINVAL;
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}
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/* The source address can only be set to NONE
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* if the device is the PAN coord
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*/
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if (meta->srcmode == IEEE802154_ADDRMODE_NONE &&
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priv->devmode != IEEE802154_DEVMODE_PANCOORD)
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{
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return -EINVAL;
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}
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/* Add the destination address length */
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ret += mac802154_addr_length[meta->destaddr.mode];
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/* Add the source address length */
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ret += mac802154_addr_length[meta->srcmode];
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/* If both destination and source addressing information is present, the
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* MAC sublayer shall compare the destination and source PAN identifiers.
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* [1] pg. 41.
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*/
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if (meta->srcmode != IEEE802154_ADDRMODE_NONE &&
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meta->destaddr.mode != IEEE802154_ADDRMODE_NONE)
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{
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/* If the PAN identifiers are identical, the PAN ID Compression field
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* shall be set to one, and the source PAN identifier shall be omitted
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* from the transmitted frame. [1] pg. 41.
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*/
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if (IEEE802154_PANIDCMP(meta->destaddr.panid, priv->addr.panid))
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{
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ret += 2; /* 2 bytes for destination PAN ID */
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return ret;
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}
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}
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/* If we are here, PAN ID compression is off, so include the dest and
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* source PAN ID if the respective address is included
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*/
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if (meta->srcmode != IEEE802154_ADDRMODE_NONE)
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{
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ret += 2; /* 2 bytes for source PAN ID */
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}
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if (meta->destaddr.mode != IEEE802154_ADDRMODE_NONE)
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{
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ret += 2; /* 2 bytes for destination PAN ID */
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}
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return ret;
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}
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