300 lines
9.4 KiB
C
300 lines
9.4 KiB
C
/****************************************************************************
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* net/sixlowpan/sixlowpan_framer.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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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 <stdbool.h>
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#include <string.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 "nuttx/net/net.h"
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#include "nuttx/net/radiodev.h"
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#include "nuttx/wireless/ieee802154/ieee802154_mac.h"
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#include "sixlowpan/sixlowpan_internal.h"
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#ifdef CONFIG_NET_6LOWPAN
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#ifdef CONFIG_WIRELESS_IEEE802154
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: sixlowpan_anyaddrnull
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*
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* Description:
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* If the destination address is all zero in the MAC header buf, then it is
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* broadcast on the 802.15.4 network.
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*
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* Input Parameters:
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* addr - The address to check
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* addrlen - The length of the address in bytes
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*
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* Returned Value:
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* True if the address is all zero.
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*
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****************************************************************************/
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static bool sixlowpan_anyaddrnull(FAR const uint8_t *addr, uint8_t addrlen)
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{
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while (addrlen-- > 0)
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{
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if (addr[addrlen] != 0x00)
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{
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return false;
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}
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}
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return true;
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}
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/****************************************************************************
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* Name: sixlowpan_saddrnull
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*
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* Description:
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* If the destination address is all zero in the MAC header buf, then it is
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* broadcast on the 802.15.4 network.
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*
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* Input Parameters:
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* eaddr - The short address to check
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*
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* Returned Value:
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* The address length associated with the address mode.
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*
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****************************************************************************/
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static inline bool sixlowpan_saddrnull(FAR const uint8_t *saddr)
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{
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return sixlowpan_anyaddrnull(saddr, NET_6LOWPAN_SADDRSIZE);
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}
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/****************************************************************************
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* Name: sixlowpan_eaddrnull
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*
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* Description:
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* If the destination address is all zero in the MAC header buf, then it is
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* broadcast on the 802.15.4 network.
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*
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* Input Parameters:
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* eaddr - The extended address to check
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*
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* Returned Value:
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* The address length associated with the address mode.
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*
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****************************************************************************/
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static inline bool sixlowpan_eaddrnull(FAR const uint8_t *eaddr)
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{
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return sixlowpan_anyaddrnull(eaddr, NET_6LOWPAN_EADDRSIZE);
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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: sixlowpan_meta_data
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*
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* Description:
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* Based on the collected attributes and addresses, construct the MAC meta
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* data structure that we need to interface with the IEEE802.15.4 MAC.
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*
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* Input Parameters:
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* radio - Radio network driver state instance.
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* pktmeta - Meta-data specific to the current outgoing frame
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* meta - Location to return the corresponding meta data.
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*
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* Returned Value:
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* Ok is returned on success; Otherwise a negated errno value is returned.
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*
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* Assumptions:
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* Called with the network locked.
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*
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****************************************************************************/
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int sixlowpan_meta_data(FAR struct radio_driver_s *radio,
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FAR const struct ieee802_txmetadata_s *pktmeta,
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FAR struct ieee802154_frame_meta_s *meta)
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{
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bool rcvrnull;
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/* Initialize all settings to all zero */
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memset(meta, 0, sizeof(struct ieee802154_frame_meta_s));
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/* Source address mode */
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meta->srcmode = pktmeta->sextended != 0 ?
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IEEE802154_ADDRMODE_EXTENDED :
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IEEE802154_ADDRMODE_SHORT;
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/* Check for a broadcast destination address (all zero) */
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if (pktmeta->dextended != 0)
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{
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/* Extended destination address mode */
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rcvrnull = sixlowpan_eaddrnull(pktmeta->dest.nm_addr);
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}
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else
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{
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/* Short destination address mode */
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rcvrnull = sixlowpan_saddrnull(pktmeta->dest.nm_addr);
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}
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if (!rcvrnull)
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{
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meta->flags.ackreq = TRUE;
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}
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/* Destination address */
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/* If the output address is NULL, then it is broadcast on the 802.15.4
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* network.
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*/
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if (rcvrnull)
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{
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/* Broadcast requires short address mode. */
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meta->destaddr.mode = IEEE802154_ADDRMODE_SHORT;
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meta->destaddr.saddr[0] = 0xff;
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meta->destaddr.saddr[1] = 0xff;
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}
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else if (pktmeta->dextended != 0)
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{
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/* Extended destination address mode */
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meta->destaddr.mode = IEEE802154_ADDRMODE_EXTENDED;
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sixlowpan_eaddrcopy(&meta->destaddr.eaddr, pktmeta->dest.nm_addr);
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}
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else
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{
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/* Short destination address mode */
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meta->destaddr.mode = IEEE802154_ADDRMODE_SHORT;
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/* 802.15.4 layer expects address in Little-Endian byte order */
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meta->destaddr.saddr[0] = pktmeta->dest.nm_addr[1];
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meta->destaddr.saddr[1] = pktmeta->dest.nm_addr[0];
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}
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/* 802.15.4 layer expects address in Little-Endian byte order */
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meta->destaddr.panid[0] = pktmeta->dpanid[1];
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meta->destaddr.panid[1] = pktmeta->dpanid[0];
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/* Handle associated with MSDU. Will increment once per packet, not
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* necessarily per frame: The same MSDU handle will be used for each
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* fragment of a disassembled packet.
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*/
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meta->handle = radio->r_msdu_handle++;
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#ifdef CONFIG_IEEE802154_SECURITY
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# warning CONFIG_IEEE802154_SECURITY not yet supported
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#endif
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#ifdef CONFIG_IEEE802154_UWB
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# warning CONFIG_IEEE802154_UWB not yet supported
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#endif
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/* Ranging left zero */
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return OK;
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}
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#endif
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/****************************************************************************
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* Name: sixlowpan_frame_hdrlen
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*
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* Description:
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* This function is before the first frame has been sent in order to
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* determine what the size of the IEEE802.15.4 header will be. No frame
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* buffer is required to make this determination.
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*
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* Input Parameters:
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* radio - A reference IEEE802.15.4 MAC network device structure.
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* meta - Meta data that describes the MAC header
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*
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* Returned Value:
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* The frame header length is returned on success; otherwise, a negated
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* errno value is return on failure.
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*
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****************************************************************************/
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int sixlowpan_frame_hdrlen(FAR struct radio_driver_s *radio,
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FAR const void *meta)
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{
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return radio->r_get_mhrlen(radio, meta);
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}
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/****************************************************************************
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* Name: sixlowpan_frame_submit
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*
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* Description:
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* This function is called after eiether (1) the IEEE802.15.4 MAC driver
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* polls for TX data or (2) after the IEEE802.15.4 MAC driver provides a
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* new incoming frame and the network responds with an outgoing packet. It
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* submits any new outgoing frame to the MAC.
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*
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* Input Parameters:
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* radio - A reference to a radio network device instance.
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* meta - Meta data that describes the MAC header
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* frame - The IOB containing the frame to be submitted.
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*
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* Returned Value:
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* Zero (OK) is returned on success; otherwise, a negated errno value is
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* return on any failure.
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*
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****************************************************************************/
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int sixlowpan_frame_submit(FAR struct radio_driver_s *radio,
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FAR const void *meta, FAR struct iob_s *frame)
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{
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return radio->r_req_data(radio, meta, frame);
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}
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#endif /* CONFIG_NET_6LOWPAN */
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