134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/****************************************************************************
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* wireless/ieee802154/mac802154_get_mhrlen.c
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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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