* net/sixlowpan/sixlowpan_framer.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdbool.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include "nuttx/net/net.h"
#include "nuttx/net/radiodev.h"
#include "nuttx/wireless/ieee802154/ieee802154_mac.h"
#include "sixlowpan/sixlowpan_internal.h"
#ifdef CONFIG_NET_6LOWPAN
#ifdef CONFIG_WIRELESS_IEEE802154
* Public Functions
****************************************************************************/
* Name: sixlowpan_anyaddrnull
*
* Description:
* If the destination address is all zero in the MAC header buf, then it is
* broadcast on the 802.15.4 network.
*
* Input Parameters:
* addr - The address to check
* addrlen - The length of the address in bytes
*
* Returned Value:
* True if the address is all zero.
*
****************************************************************************/
static bool sixlowpan_anyaddrnull(FAR const uint8_t *addr, uint8_t addrlen)
{
while (addrlen-- > 0)
{
if (addr[addrlen] != 0x00)
{
return false;
}
}
return true;
}
* Name: sixlowpan_saddrnull
*
* Description:
* If the destination address is all zero in the MAC header buf, then it is
* broadcast on the 802.15.4 network.
*
* Input Parameters:
* eaddr - The short address to check
*
* Returned Value:
* The address length associated with the address mode.
*
****************************************************************************/
static inline bool sixlowpan_saddrnull(FAR const uint8_t *saddr)
{
return sixlowpan_anyaddrnull(saddr, NET_6LOWPAN_SADDRSIZE);
}
* Name: sixlowpan_eaddrnull
*
* Description:
* If the destination address is all zero in the MAC header buf, then it is
* broadcast on the 802.15.4 network.
*
* Input Parameters:
* eaddr - The extended address to check
*
* Returned Value:
* The address length associated with the address mode.
*
****************************************************************************/
static inline bool sixlowpan_eaddrnull(FAR const uint8_t *eaddr)
{
return sixlowpan_anyaddrnull(eaddr, NET_6LOWPAN_EADDRSIZE);
}
* Public Functions
****************************************************************************/
* Name: sixlowpan_meta_data
*
* Description:
* Based on the collected attributes and addresses, construct the MAC meta
* data structure that we need to interface with the IEEE802.15.4 MAC.
*
* Input Parameters:
* radio - Radio network driver state instance.
* pktmeta - Meta-data specific to the current outgoing frame
* meta - Location to return the corresponding meta data.
*
* Returned Value:
* Ok is returned on success; Otherwise a negated errno value is returned.
*
* Assumptions:
* Called with the network locked.
*
****************************************************************************/
int sixlowpan_meta_data(FAR struct radio_driver_s *radio,
FAR const struct ieee802_txmetadata_s *pktmeta,
FAR struct ieee802154_frame_meta_s *meta)
{
bool rcvrnull;
memset(meta, 0, sizeof(struct ieee802154_frame_meta_s));
meta->srcmode = pktmeta->sextended != 0 ?
IEEE802154_ADDRMODE_EXTENDED :
IEEE802154_ADDRMODE_SHORT;
if (pktmeta->dextended != 0)
{
rcvrnull = sixlowpan_eaddrnull(pktmeta->dest.nm_addr);
}
else
{
rcvrnull = sixlowpan_saddrnull(pktmeta->dest.nm_addr);
}
if (!rcvrnull)
{
meta->flags.ackreq = TRUE;
}
* network.
*/
if (rcvrnull)
{
meta->destaddr.mode = IEEE802154_ADDRMODE_SHORT;
meta->destaddr.saddr[0] = 0xff;
meta->destaddr.saddr[1] = 0xff;
}
else if (pktmeta->dextended != 0)
{
meta->destaddr.mode = IEEE802154_ADDRMODE_EXTENDED;
sixlowpan_eaddrcopy(&meta->destaddr.eaddr, pktmeta->dest.nm_addr);
}
else
{
meta->destaddr.mode = IEEE802154_ADDRMODE_SHORT;
meta->destaddr.saddr[0] = pktmeta->dest.nm_addr[1];
meta->destaddr.saddr[1] = pktmeta->dest.nm_addr[0];
}
meta->destaddr.panid[0] = pktmeta->dpanid[1];
meta->destaddr.panid[1] = pktmeta->dpanid[0];
* necessarily per frame: The same MSDU handle will be used for each
* fragment of a disassembled packet.
*/
meta->handle = radio->r_msdu_handle++;
#ifdef CONFIG_IEEE802154_SECURITY
# warning CONFIG_IEEE802154_SECURITY not yet supported
#endif
#ifdef CONFIG_IEEE802154_UWB
# warning CONFIG_IEEE802154_UWB not yet supported
#endif
return OK;
}
#endif
* Name: sixlowpan_frame_hdrlen
*
* Description:
* This function is before the first frame has been sent in order to
* determine what the size of the IEEE802.15.4 header will be. No frame
* buffer is required to make this determination.
*
* Input Parameters:
* radio - A reference IEEE802.15.4 MAC network device structure.
* meta - Meta data that describes the MAC header
*
* Returned Value:
* The frame header length is returned on success; otherwise, a negated
* errno value is return on failure.
*
****************************************************************************/
int sixlowpan_frame_hdrlen(FAR struct radio_driver_s *radio,
FAR const void *meta)
{
return radio->r_get_mhrlen(radio, meta);
}
* Name: sixlowpan_frame_submit
*
* Description:
* This function is called after eiether (1) the IEEE802.15.4 MAC driver
* polls for TX data or (2) after the IEEE802.15.4 MAC driver provides a
* new incoming frame and the network responds with an outgoing packet. It
* submits any new outgoing frame to the MAC.
*
* Input Parameters:
* radio - A reference to a radio network device instance.
* meta - Meta data that describes the MAC header
* frame - The IOB containing the frame to be submitted.
*
* Returned Value:
* Zero (OK) is returned on success; otherwise, a negated errno value is
* return on any failure.
*
****************************************************************************/
int sixlowpan_frame_submit(FAR struct radio_driver_s *radio,
FAR const void *meta, FAR struct iob_s *frame)
{
return radio->r_req_data(radio, meta, frame);
}
#endif